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servo/components/script_bindings/codegen/CodegenRust.py
Josh Matthews b4079b3ff3
Move generated bindings to script_bindings (#36323) 
This is the final step of #1799, where the majority of the generated
code for the JS bindings is now compiled as part of the script_bindings
build step. The remaining pieces in script must live there because they
refer to concrete DOM types; all code in script_bindings is generic over
the
[DomTypes](https://doc.servo.org/script/dom/bindings/codegen/DomTypes/trait.DomTypes.html)
trait.

My testing with incremental builds shows me a 12 second reduction in
build times on my 2024 M4 Macbook Pro when modifying code in the script
crate after these changes. Before this PR those changes took 20 seconds
to rebuild Servo, and now they take 8 seconds.

Testing: Existing WPT tests ensure no regressions.
Fixes: #1799

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
2025-04-04 06:45:08 +00:00

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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.
# Common codegen classes.
from collections import defaultdict
from itertools import groupby
import operator
import os
import re
import string
import textwrap
import functools
from WebIDL import (
BuiltinTypes,
IDLArgument,
IDLBuiltinType,
IDLDefaultDictionaryValue,
IDLEmptySequenceValue,
IDLInterface,
IDLInterfaceMember,
IDLNullableType,
IDLNullValue,
IDLObject,
IDLPromiseType,
IDLType,
IDLTypedefType,
IDLUndefinedValue,
IDLWrapperType,
)
from Configuration import (
MakeNativeName,
MemberIsLegacyUnforgeable,
getModuleFromObject,
getTypesFromCallback,
getTypesFromDescriptor,
getTypesFromDictionary,
iteratorNativeType
)
AUTOGENERATED_WARNING_COMMENT = "/* THIS FILE IS AUTOGENERATED - DO NOT EDIT */\n\n"
ALLOWED_WARNING_LIST = ['non_camel_case_types', 'non_upper_case_globals', 'unused_imports',
'unused_variables', 'unused_assignments', 'unused_mut',
'clippy::approx_constant', 'clippy::enum_variant_names', 'clippy::let_unit_value',
'clippy::needless_return', 'clippy::too_many_arguments', 'clippy::unnecessary_cast',
'clippy::upper_case_acronyms']
ALLOWED_WARNINGS = f"#![allow({','.join(ALLOWED_WARNING_LIST)})]\n\n"
FINALIZE_HOOK_NAME = '_finalize'
TRACE_HOOK_NAME = '_trace'
CONSTRUCT_HOOK_NAME = '_constructor'
HASINSTANCE_HOOK_NAME = '_hasInstance'
RUST_KEYWORDS = {"abstract", "alignof", "as", "become", "box", "break", "const", "continue",
"else", "enum", "extern", "false", "final", "fn", "for", "if", "impl", "in",
"let", "loop", "macro", "match", "mod", "move", "mut", "offsetof", "override",
"priv", "proc", "pub", "pure", "ref", "return", "static", "self", "sizeof",
"struct", "super", "true", "trait", "type", "typeof", "unsafe", "unsized",
"use", "virtual", "where", "while", "yield"}
def genericsForType(t):
if containsDomInterface(t):
return ("<D: DomTypes>", "<D>")
return ("", "")
def isDomInterface(t, logging=False):
while isinstance(t, IDLNullableType) or isinstance(t, IDLWrapperType):
t = t.inner
if isinstance(t, IDLInterface):
return True
if t.isCallback() or t.isPromise():
return True
return t.isInterface() and (t.isGeckoInterface() or (t.isSpiderMonkeyInterface() and not t.isBufferSource()))
def containsDomInterface(t, logging=False):
if isinstance(t, IDLArgument):
t = t.type
if isinstance(t, IDLTypedefType):
t = t.innerType
while isinstance(t, IDLNullableType) or isinstance(t, IDLWrapperType):
t = t.inner
if t.isEnum():
return False
if t.isUnion():
return any(map(lambda x: containsDomInterface(x), t.flatMemberTypes))
if t.isDictionary():
return any(map(lambda x: containsDomInterface(x), t.members)) or (t.parent and containsDomInterface(t.parent))
if isDomInterface(t):
return True
if t.isSequence():
return containsDomInterface(t.inner)
return False
def toStringBool(arg):
return str(not not arg).lower()
def toBindingNamespace(arg):
"""
Namespaces are *_Bindings
actual path is `codegen::Bindings::{toBindingModuleFile(name)}::{toBindingNamespace(name)}`
"""
return re.sub("((_workers)?$)", "_Binding\\1", MakeNativeName(arg))
def toBindingModuleFile(arg):
"""
Module files are *Bindings
actual path is `codegen::Bindings::{toBindingModuleFile(name)}::{toBindingNamespace(name)}`
"""
return re.sub("((_workers)?$)", "Binding\\1", MakeNativeName(arg))
def toBindingModuleFileFromDescriptor(desc):
if desc.maybeGetSuperModule() is not None:
return toBindingModuleFile(desc.maybeGetSuperModule())
else:
return toBindingModuleFile(desc.name)
def stripTrailingWhitespace(text):
tail = '\n' if text.endswith('\n') else ''
lines = text.splitlines()
for i in range(len(lines)):
lines[i] = lines[i].rstrip()
joined_lines = '\n'.join(lines)
return f"{joined_lines}{tail}"
def innerContainerType(type):
assert type.isSequence() or type.isRecord()
return type.inner.inner if type.nullable() else type.inner
def wrapInNativeContainerType(type, inner):
if type.isSequence():
return CGWrapper(inner, pre="Vec<", post=">")
elif type.isRecord():
key = type.inner.keyType if type.nullable() else type.keyType
return CGRecord(key, inner)
else:
raise TypeError(f"Unexpected container type {type}")
builtinNames = {
IDLType.Tags.bool: 'bool',
IDLType.Tags.int8: 'i8',
IDLType.Tags.int16: 'i16',
IDLType.Tags.int32: 'i32',
IDLType.Tags.int64: 'i64',
IDLType.Tags.uint8: 'u8',
IDLType.Tags.uint16: 'u16',
IDLType.Tags.uint32: 'u32',
IDLType.Tags.uint64: 'u64',
IDLType.Tags.unrestricted_float: 'f32',
IDLType.Tags.float: 'Finite<f32>',
IDLType.Tags.unrestricted_double: 'f64',
IDLType.Tags.double: 'Finite<f64>',
IDLType.Tags.int8array: 'Int8Array',
IDLType.Tags.uint8array: 'Uint8Array',
IDLType.Tags.int16array: 'Int16Array',
IDLType.Tags.uint16array: 'Uint16Array',
IDLType.Tags.int32array: 'Int32Array',
IDLType.Tags.uint32array: 'Uint32Array',
IDLType.Tags.float32array: 'Float32Array',
IDLType.Tags.float64array: 'Float64Array',
IDLType.Tags.arrayBuffer: 'ArrayBuffer',
IDLType.Tags.arrayBufferView: 'ArrayBufferView',
IDLType.Tags.uint8clampedarray: 'Uint8ClampedArray',
}
numericTags = [
IDLType.Tags.int8, IDLType.Tags.uint8,
IDLType.Tags.int16, IDLType.Tags.uint16,
IDLType.Tags.int32, IDLType.Tags.uint32,
IDLType.Tags.int64, IDLType.Tags.uint64,
IDLType.Tags.unrestricted_float,
IDLType.Tags.unrestricted_double
]
# We'll want to insert the indent at the beginnings of lines, but we
# don't want to indent empty lines. So only indent lines that have a
# non-newline character on them.
lineStartDetector = re.compile("^(?=[^\n#])", re.MULTILINE)
def indent(s, indentLevel=2):
"""
Indent C++ code.
Weird secret feature: this doesn't indent lines that start with # (such as
#include lines or #ifdef/#endif).
"""
if s == "":
return s
return re.sub(lineStartDetector, indentLevel * " ", s)
# dedent() and fill() are often called on the same string multiple
# times. We want to memoize their return values so we don't keep
# recomputing them all the time.
def memoize(fn):
"""
Decorator to memoize a function of one argument. The cache just
grows without bound.
"""
cache = {}
@functools.wraps(fn)
def wrapper(arg):
retval = cache.get(arg)
if retval is None:
retval = cache[arg] = fn(arg)
return retval
return wrapper
@memoize
def dedent(s):
"""
Remove all leading whitespace from s, and remove a blank line
at the beginning.
"""
if s.startswith('\n'):
s = s[1:]
return textwrap.dedent(s)
# This works by transforming the fill()-template to an equivalent
# string.Template.
fill_multiline_substitution_re = re.compile(r"( *)\$\*{(\w+)}(\n)?")
@memoize
def compile_fill_template(template):
"""
Helper function for fill(). Given the template string passed to fill(),
do the reusable part of template processing and return a pair (t,
argModList) that can be used every time fill() is called with that
template argument.
argsModList is list of tuples that represent modifications to be
made to args. Each modification has, in order: i) the arg name,
ii) the modified name, iii) the indent depth.
"""
t = dedent(template)
assert t.endswith("\n") or "\n" not in t
argModList = []
def replace(match):
"""
Replaces a line like ' $*{xyz}\n' with '${xyz_n}',
where n is the indent depth, and add a corresponding entry to
argModList.
Note that this needs to close over argModList, so it has to be
defined inside compile_fill_template().
"""
indentation, name, nl = match.groups()
depth = len(indentation)
# Check that $*{xyz} appears by itself on a line.
prev = match.string[:match.start()]
if (prev and not prev.endswith("\n")) or nl is None:
raise ValueError(f"Invalid fill() template: $*{name} must appear by itself on a line")
# Now replace this whole line of template with the indented equivalent.
modified_name = f"{name}_{depth}"
argModList.append((name, modified_name, depth))
return f"${{{modified_name}}}"
t = re.sub(fill_multiline_substitution_re, replace, t)
return (string.Template(t), argModList)
def fill(template, **args):
"""
Convenience function for filling in a multiline template.
`fill(template, name1=v1, name2=v2)` is a lot like
`string.Template(template).substitute({"name1": v1, "name2": v2})`.
However, it's shorter, and has a few nice features:
* If `template` is indented, fill() automatically dedents it!
This makes code using fill() with Python's multiline strings
much nicer to look at.
* If `template` starts with a blank line, fill() strips it off.
(Again, convenient with multiline strings.)
* fill() recognizes a special kind of substitution
of the form `$*{name}`.
Use this to paste in, and automatically indent, multiple lines.
(Mnemonic: The `*` is for "multiple lines").
A `$*` substitution must appear by itself on a line, with optional
preceding indentation (spaces only). The whole line is replaced by the
corresponding keyword argument, indented appropriately. If the
argument is an empty string, no output is generated, not even a blank
line.
"""
t, argModList = compile_fill_template(template)
# Now apply argModList to args
for (name, modified_name, depth) in argModList:
if not (args[name] == "" or args[name].endswith("\n")):
raise ValueError(f"Argument {name} with value {args[name]} is missing a newline")
args[modified_name] = indent(args[name], depth)
return t.substitute(args)
class CGThing():
"""
Abstract base class for things that spit out code.
"""
def __init__(self):
pass # Nothing for now
def define(self):
"""Produce code for a Rust file."""
raise NotImplementedError # Override me!
class CGMethodCall(CGThing):
"""
A class to generate selection of a method signature from a set of
signatures and generation of a call to that signature.
"""
def __init__(self, argsPre, nativeMethodName, static, descriptor, method):
CGThing.__init__(self)
methodName = f'\\"{descriptor.interface.identifier.name}.{method.identifier.name}\\"'
def requiredArgCount(signature):
arguments = signature[1]
if len(arguments) == 0:
return 0
requiredArgs = len(arguments)
while requiredArgs and arguments[requiredArgs - 1].optional:
requiredArgs -= 1
return requiredArgs
signatures = method.signatures()
def getPerSignatureCall(signature, argConversionStartsAt=0):
signatureIndex = signatures.index(signature)
return CGPerSignatureCall(signature[0], argsPre, signature[1],
f"{nativeMethodName}{'_' * signatureIndex}",
static, descriptor,
method, argConversionStartsAt)
if len(signatures) == 1:
# Special case: we can just do a per-signature method call
# here for our one signature and not worry about switching
# on anything.
signature = signatures[0]
self.cgRoot = CGList([getPerSignatureCall(signature)])
requiredArgs = requiredArgCount(signature)
if requiredArgs > 0:
code = (
f"if argc < {requiredArgs} {{\n"
f" throw_type_error(*cx, \"Not enough arguments to {methodName}.\");\n"
" return false;\n"
"}")
self.cgRoot.prepend(
CGWrapper(CGGeneric(code), pre="\n", post="\n"))
return
# Need to find the right overload
maxArgCount = method.maxArgCount
allowedArgCounts = method.allowedArgCounts
argCountCases = []
for argCount in allowedArgCounts:
possibleSignatures = method.signaturesForArgCount(argCount)
if len(possibleSignatures) == 1:
# easy case!
signature = possibleSignatures[0]
argCountCases.append(CGCase(str(argCount), getPerSignatureCall(signature)))
continue
distinguishingIndex = method.distinguishingIndexForArgCount(argCount)
# We can't handle unions of non-object values at the distinguishing index.
for (returnType, args) in possibleSignatures:
type = args[distinguishingIndex].type
if type.isUnion():
if type.nullable():
type = type.inner
for type in type.flatMemberTypes:
if not (type.isObject() or type.isNonCallbackInterface()):
raise TypeError("No support for unions with non-object variants "
f"as distinguishing arguments yet: {args[distinguishingIndex].location}",
)
# Convert all our arguments up to the distinguishing index.
# Doesn't matter which of the possible signatures we use, since
# they all have the same types up to that point; just use
# possibleSignatures[0]
caseBody = [
CGArgumentConverter(possibleSignatures[0][1][i],
i, "args", "argc", descriptor)
for i in range(0, distinguishingIndex)]
# Select the right overload from our set.
distinguishingArg = f"HandleValue::from_raw(args.get({distinguishingIndex}))"
def pickFirstSignature(condition, filterLambda):
sigs = list(filter(filterLambda, possibleSignatures))
assert len(sigs) < 2
if len(sigs) > 0:
call = getPerSignatureCall(sigs[0], distinguishingIndex)
if condition is None:
caseBody.append(call)
else:
caseBody.append(CGGeneric(f"if {condition} {{"))
caseBody.append(CGIndenter(call))
caseBody.append(CGGeneric("}"))
return True
return False
# First check for null or undefined
pickFirstSignature(f"{distinguishingArg}.get().is_null_or_undefined()",
lambda s: (s[1][distinguishingIndex].type.nullable()
or s[1][distinguishingIndex].type.isDictionary()))
# Now check for distinguishingArg being an object that implements a
# non-callback interface. That includes typed arrays and
# arraybuffers.
interfacesSigs = [
s for s in possibleSignatures
if (s[1][distinguishingIndex].type.isObject()
or s[1][distinguishingIndex].type.isUnion()
or s[1][distinguishingIndex].type.isNonCallbackInterface())]
# There might be more than one of these; we need to check
# which ones we unwrap to.
if len(interfacesSigs) > 0:
# The spec says that we should check for "platform objects
# implementing an interface", but it's enough to guard on these
# being an object. The code for unwrapping non-callback
# interfaces and typed arrays will just bail out and move on to
# the next overload if the object fails to unwrap correctly. We
# could even not do the isObject() check up front here, but in
# cases where we have multiple object overloads it makes sense
# to do it only once instead of for each overload. That will
# also allow the unwrapping test to skip having to do codegen
# for the null-or-undefined case, which we already handled
# above.
caseBody.append(CGGeneric(f"if {distinguishingArg}.get().is_object() {{"))
for idx, sig in enumerate(interfacesSigs):
caseBody.append(CGIndenter(CGGeneric("'_block: {")))
type = sig[1][distinguishingIndex].type
# The argument at index distinguishingIndex can't possibly
# be unset here, because we've already checked that argc is
# large enough that we can examine this argument.
info = getJSToNativeConversionInfo(
type, descriptor, failureCode="break '_block;", isDefinitelyObject=True)
template = info.template
declType = info.declType
testCode = instantiateJSToNativeConversionTemplate(
template,
{"val": distinguishingArg},
declType,
f"arg{distinguishingIndex}",
needsAutoRoot=type_needs_auto_root(type))
# Indent by 4, since we need to indent further than our "do" statement
caseBody.append(CGIndenter(testCode, 4))
# If we got this far, we know we unwrapped to the right
# interface, so just do the call. Start conversion with
# distinguishingIndex + 1, since we already converted
# distinguishingIndex.
caseBody.append(CGIndenter(
getPerSignatureCall(sig, distinguishingIndex + 1), 4))
caseBody.append(CGIndenter(CGGeneric("}")))
caseBody.append(CGGeneric("}"))
# XXXbz Now we're supposed to check for distinguishingArg being
# an array or a platform object that supports indexed
# properties... skip that last for now. It's a bit of a pain.
pickFirstSignature(f"{distinguishingArg}.get().is_object() && is_array_like::<D>(*cx, {distinguishingArg})",
lambda s:
(s[1][distinguishingIndex].type.isSequence()
or s[1][distinguishingIndex].type.isObject()))
# Check for vanilla JS objects
# XXXbz Do we need to worry about security wrappers?
pickFirstSignature(f"{distinguishingArg}.get().is_object()",
lambda s: (s[1][distinguishingIndex].type.isCallback()
or s[1][distinguishingIndex].type.isCallbackInterface()
or s[1][distinguishingIndex].type.isDictionary()
or s[1][distinguishingIndex].type.isObject()))
# The remaining cases are mutually exclusive. The
# pickFirstSignature calls are what change caseBody
# Check for strings or enums
if pickFirstSignature(None,
lambda s: (s[1][distinguishingIndex].type.isString()
or s[1][distinguishingIndex].type.isEnum())):
pass
# Check for primitives
elif pickFirstSignature(None,
lambda s: s[1][distinguishingIndex].type.isPrimitive()):
pass
# Check for "any"
elif pickFirstSignature(None,
lambda s: s[1][distinguishingIndex].type.isAny()):
pass
else:
# Just throw; we have no idea what we're supposed to
# do with this.
caseBody.append(CGGeneric("throw_type_error(*cx, \"Could not convert JavaScript argument\");\n"
"return false;"))
argCountCases.append(CGCase(str(argCount),
CGList(caseBody, "\n")))
overloadCGThings = []
overloadCGThings.append(
CGGeneric(f"let argcount = cmp::min(argc, {maxArgCount});"))
overloadCGThings.append(
CGSwitch("argcount",
argCountCases,
CGGeneric(f"throw_type_error(*cx, \"Not enough arguments to {methodName}.\");\n"
"return false;")))
# XXXjdm Avoid unreachable statement warnings
# overloadCGThings.append(
# CGGeneric('panic!("We have an always-returning default case");\n'
# 'return false;'))
self.cgRoot = CGWrapper(CGList(overloadCGThings, "\n"),
pre="\n")
def define(self):
return self.cgRoot.define()
def dictionaryHasSequenceMember(dictionary):
return (any(typeIsSequenceOrHasSequenceMember(m.type) for m in
dictionary.members)
or (dictionary.parent
and dictionaryHasSequenceMember(dictionary.parent)))
def typeIsSequenceOrHasSequenceMember(type):
if type.nullable():
type = type.inner
if type.isSequence():
return True
if type.isDictionary():
return dictionaryHasSequenceMember(type.inner)
if type.isUnion():
return any(typeIsSequenceOrHasSequenceMember(m.type) for m in
type.flatMemberTypes)
return False
def union_native_type(t):
name = t.unroll().name
generic = "<D>" if containsDomInterface(t) else ""
return f'GenericUnionTypes::{name}{generic}'
# Unfortunately, .capitalize() on a string will lowercase things inside the
# string, which we do not want.
def firstCap(string):
return f"{string[0].upper()}{string[1:]}"
class JSToNativeConversionInfo():
"""
An object representing information about a JS-to-native conversion.
"""
def __init__(self, template, default=None, declType=None):
"""
template: A string representing the conversion code. This will have
template substitution performed on it as follows:
${val} is a handle to the JS::Value in question
default: A string or None representing rust code for default value(if any).
declType: A CGThing representing the native C++ type we're converting
to. This is allowed to be None if the conversion code is
supposed to be used as-is.
"""
assert isinstance(template, str)
assert declType is None or isinstance(declType, CGThing)
self.template = template
self.default = default
self.declType = declType
def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
isDefinitelyObject=False,
isMember=False,
isArgument=False,
isAutoRooted=False,
invalidEnumValueFatal=True,
defaultValue=None,
exceptionCode=None,
allowTreatNonObjectAsNull=False,
isCallbackReturnValue=False,
sourceDescription="value"):
"""
Get a template for converting a JS value to a native object based on the
given type and descriptor. If failureCode is given, then we're actually
testing whether we can convert the argument to the desired type. That
means that failures to convert due to the JS value being the wrong type of
value need to use failureCode instead of throwing exceptions. Failures to
convert that are due to JS exceptions (from toString or valueOf methods) or
out of memory conditions need to throw exceptions no matter what
failureCode is.
If isDefinitelyObject is True, that means we know the value
isObject() and we have no need to recheck that.
isMember is `False`, "Dictionary", "Union" or "Variadic", and affects
whether this function returns code suitable for an on-stack rooted binding
or suitable for storing in an appropriate larger structure.
invalidEnumValueFatal controls whether an invalid enum value conversion
attempt will throw (if true) or simply return without doing anything (if
false).
If defaultValue is not None, it's the IDL default value for this conversion
If allowTreatNonObjectAsNull is true, then [TreatNonObjectAsNull]
extended attributes on nullable callback functions will be honored.
The return value from this function is an object of JSToNativeConversionInfo consisting of four things:
1) A string representing the conversion code. This will have template
substitution performed on it as follows:
${val} replaced by an expression for the JS::Value in question
2) A string or None representing Rust code for the default value (if any).
3) A CGThing representing the native C++ type we're converting to
(declType). This is allowed to be None if the conversion code is
supposed to be used as-is.
4) A boolean indicating whether the caller has to root the result.
"""
# We should not have a defaultValue if we know we're an object
assert not isDefinitelyObject or defaultValue is None
isEnforceRange = type.hasEnforceRange()
isClamp = type.hasClamp()
if type.legacyNullToEmptyString:
treatNullAs = "EmptyString"
else:
treatNullAs = "Default"
# If exceptionCode is not set, we'll just rethrow the exception we got.
# Note that we can't just set failureCode to exceptionCode, because setting
# failureCode will prevent pending exceptions from being set in cases when
# they really should be!
if exceptionCode is None:
exceptionCode = "return false;\n"
if failureCode is None:
failOrPropagate = f"throw_type_error(*cx, &error);\n{exceptionCode}"
else:
failOrPropagate = failureCode
def handleOptional(template, declType, default):
assert (defaultValue is None) == (default is None)
return JSToNativeConversionInfo(template, default, declType)
# Helper functions for dealing with failures due to the JS value being the
# wrong type of value.
def onFailureNotAnObject(failureCode):
return CGWrapper(
CGGeneric(
failureCode
or (f'throw_type_error(*cx, "{firstCap(sourceDescription)} is not an object.");\n'
f'{exceptionCode}')),
post="\n")
def onFailureNotCallable(failureCode):
return CGGeneric(
failureCode
or (f'throw_type_error(*cx, \"{firstCap(sourceDescription)} is not callable.\");\n'
f'{exceptionCode}'))
# A helper function for handling default values.
def handleDefault(nullValue):
if defaultValue is None:
return None
if isinstance(defaultValue, IDLNullValue):
assert type.nullable()
return nullValue
elif isinstance(defaultValue, IDLDefaultDictionaryValue):
assert type.isDictionary()
return nullValue
elif isinstance(defaultValue, IDLEmptySequenceValue):
assert type.isSequence()
return "Vec::new()"
raise TypeError("Can't handle non-null, non-empty sequence or non-empty dictionary default value here")
# A helper function for wrapping up the template body for
# possibly-nullable objecty stuff
def wrapObjectTemplate(templateBody, nullValue, isDefinitelyObject, type,
failureCode=None):
if not isDefinitelyObject:
# Handle the non-object cases by wrapping up the whole
# thing in an if cascade.
templateBody = (
"if ${val}.get().is_object() {\n"
f"{CGIndenter(CGGeneric(templateBody)).define()}\n")
if type.nullable():
templateBody += (
"} else if ${val}.get().is_null_or_undefined() {\n"
f" {nullValue}\n")
templateBody += (
"} else {\n"
f"{CGIndenter(onFailureNotAnObject(failureCode)).define()}"
"}")
return templateBody
assert not (isEnforceRange and isClamp) # These are mutually exclusive
if type.isSequence() or type.isRecord():
innerInfo = getJSToNativeConversionInfo(innerContainerType(type),
descriptorProvider,
isMember="Sequence",
isAutoRooted=isAutoRooted)
declType = wrapInNativeContainerType(type, innerInfo.declType)
config = getConversionConfigForType(type, innerContainerType(type).hasEnforceRange(), isClamp, treatNullAs)
if type.nullable():
declType = CGWrapper(declType, pre="Option<", post=" >")
templateBody = (f"match FromJSValConvertible::from_jsval(*cx, ${{val}}, {config}) {{\n"
" Ok(ConversionResult::Success(value)) => value,\n"
" Ok(ConversionResult::Failure(error)) => {\n"
f"{indent(failOrPropagate, 8)}\n"
" }\n"
f" _ => {{ {exceptionCode} }},\n"
"}")
return handleOptional(templateBody, declType, handleDefault("None"))
if type.isUnion():
declType = CGGeneric(union_native_type(type))
if type.nullable():
declType = CGWrapper(declType, pre="Option<", post=" >")
templateBody = ("match FromJSValConvertible::from_jsval(*cx, ${val}, ()) {\n"
" Ok(ConversionResult::Success(value)) => value,\n"
" Ok(ConversionResult::Failure(error)) => {\n"
f"{indent(failOrPropagate, 8)}\n"
" }\n"
f" _ => {{ {exceptionCode} }},\n"
"}")
dictionaries = [
memberType
for memberType in type.unroll().flatMemberTypes
if memberType.isDictionary()
]
if (defaultValue
and not isinstance(defaultValue, IDLNullValue)
and not isinstance(defaultValue, IDLDefaultDictionaryValue)):
tag = defaultValue.type.tag()
if tag is IDLType.Tags.bool:
boolean = "true" if defaultValue.value else "false"
default = f"{union_native_type(type)}::Boolean({boolean})"
elif tag is IDLType.Tags.usvstring:
default = f'{union_native_type(type)}::USVString(USVString("{defaultValue.value}".to_owned()))'
elif defaultValue.type.isEnum():
enum = defaultValue.type.inner.identifier.name
default = f"{union_native_type(type)}::{enum}({enum}::{getEnumValueName(defaultValue.value)})"
else:
raise NotImplementedError("We don't currently support default values that aren't \
null, boolean or default dictionary")
elif dictionaries:
if defaultValue:
assert isinstance(defaultValue, IDLDefaultDictionaryValue)
dictionary, = dictionaries
default = (
f"{union_native_type(type)}::{dictionary.name}("
f"{CGDictionary.makeModuleName(dictionary.inner)}::"
f"{CGDictionary.makeDictionaryName(dictionary.inner)}::empty())"
)
else:
default = None
else:
default = handleDefault("None")
return handleOptional(templateBody, declType, default)
if type.isPromise():
assert not type.nullable()
# Per spec, what we're supposed to do is take the original
# Promise.resolve and call it with the original Promise as this
# value to make a Promise out of whatever value we actually have
# here. The question is which global we should use. There are
# a couple cases to consider:
#
# 1) Normal call to API with a Promise argument. This is a case the
# spec covers, and we should be using the current Realm's
# Promise. That means the current realm.
# 2) Promise return value from a callback or callback interface.
# This is in theory a case the spec covers but in practice it
# really doesn't define behavior here because it doesn't define
# what Realm we're in after the callback returns, which is when
# the argument conversion happens. We will use the current
# realm, which is the realm of the callable (which
# may itself be a cross-realm wrapper itself), which makes
# as much sense as anything else. In practice, such an API would
# once again be providing a Promise to signal completion of an
# operation, which would then not be exposed to anyone other than
# our own implementation code.
templateBody = fill(
"""
{ // Scope for our JSAutoRealm.
rooted!(in(*cx) let globalObj = CurrentGlobalOrNull(*cx));
let promiseGlobal = D::GlobalScope::from_object_maybe_wrapped(globalObj.handle().get(), *cx);
rooted!(in(*cx) let mut valueToResolve = $${val}.get());
if !JS_WrapValue(*cx, valueToResolve.handle_mut()) {
$*{exceptionCode}
}
D::Promise::new_resolved(&promiseGlobal, cx, valueToResolve.handle())
}
""",
exceptionCode=exceptionCode)
if isArgument:
declType = CGGeneric("&D::Promise")
else:
declType = CGGeneric("Rc<D::Promise>")
return handleOptional(templateBody, declType, handleDefault("None"))
if type.isGeckoInterface():
assert not isEnforceRange and not isClamp
descriptor = descriptorProvider.getDescriptor(
type.unroll().inner.identifier.name)
if descriptor.interface.isCallback():
name = descriptor.nativeType
declType = CGWrapper(CGGeneric(f"{name}<D>"), pre="Rc<", post=">")
template = f"{name}::new(cx, ${{val}}.get().to_object())"
if type.nullable():
declType = CGWrapper(declType, pre="Option<", post=">")
template = wrapObjectTemplate(f"Some({template})", "None",
isDefinitelyObject, type,
failureCode)
return handleOptional(template, declType, handleDefault("None"))
conversionFunction = "root_from_handlevalue"
descriptorType = descriptor.returnType
if isMember == "Variadic":
conversionFunction = "native_from_handlevalue"
descriptorType = descriptor.nativeType
elif isArgument:
descriptorType = descriptor.argumentType
elif descriptor.interface.identifier.name == "WindowProxy":
conversionFunction = "windowproxy_from_handlevalue::<D>"
if failureCode is None:
unwrapFailureCode = (
f'throw_type_error(*cx, "{sourceDescription} does not '
f'implement interface {descriptor.interface.identifier.name}.");\n'
f'{exceptionCode}')
else:
unwrapFailureCode = failureCode
templateBody = fill(
"""
match ${function}($${val}, *cx) {
Ok(val) => val,
Err(()) => {
$*{failureCode}
}
}
""",
failureCode=unwrapFailureCode + "\n",
function=conversionFunction)
declType = CGGeneric(descriptorType)
if type.nullable():
templateBody = f"Some({templateBody})"
declType = CGWrapper(declType, pre="Option<", post=">")
templateBody = wrapObjectTemplate(templateBody, "None",
isDefinitelyObject, type, failureCode)
return handleOptional(templateBody, declType, handleDefault("None"))
if is_typed_array(type):
if failureCode is None:
unwrapFailureCode = (f'throw_type_error(*cx, "{sourceDescription} is not a typed array.");\n'
f'{exceptionCode}')
else:
unwrapFailureCode = failureCode
typeName = type.unroll().name # unroll because it may be nullable
if isMember == "Union":
typeName = f"Heap{typeName}"
templateBody = fill(
"""
match typedarray::${ty}::from($${val}.get().to_object()) {
Ok(val) => val,
Err(()) => {
$*{failureCode}
}
}
""",
ty=typeName,
failureCode=f"{unwrapFailureCode}\n",
)
if isMember == "Union":
templateBody = f"RootedTraceableBox::new({templateBody})"
declType = CGGeneric(f"typedarray::{typeName}")
if type.nullable():
templateBody = f"Some({templateBody})"
declType = CGWrapper(declType, pre="Option<", post=">")
templateBody = wrapObjectTemplate(templateBody, "None",
isDefinitelyObject, type, failureCode)
return handleOptional(templateBody, declType, handleDefault("None"))
elif type.isSpiderMonkeyInterface():
raise TypeError("Can't handle SpiderMonkey interface arguments other than typed arrays yet")
if type.isDOMString():
nullBehavior = getConversionConfigForType(type, isEnforceRange, isClamp, treatNullAs)
conversionCode = (
f"match FromJSValConvertible::from_jsval(*cx, ${{val}}, {nullBehavior}) {{\n"
" Ok(ConversionResult::Success(strval)) => strval,\n"
" Ok(ConversionResult::Failure(error)) => {\n"
f"{indent(failOrPropagate, 8)}\n"
" }\n"
f" _ => {{ {exceptionCode} }},\n"
"}")
if defaultValue is None:
default = None
elif isinstance(defaultValue, IDLNullValue):
assert type.nullable()
default = "None"
else:
assert defaultValue.type.tag() == IDLType.Tags.domstring
default = f'DOMString::from("{defaultValue.value}")'
if type.nullable():
default = f"Some({default})"
declType = "DOMString"
if type.nullable():
declType = f"Option<{declType}>"
return handleOptional(conversionCode, CGGeneric(declType), default)
if type.isUSVString():
assert not isEnforceRange and not isClamp
conversionCode = (
"match FromJSValConvertible::from_jsval(*cx, ${val}, ()) {\n"
" Ok(ConversionResult::Success(strval)) => strval,\n"
" Ok(ConversionResult::Failure(error)) => {\n"
f"{indent(failOrPropagate, 8)}\n"
" }\n"
f" _ => {{ {exceptionCode} }},\n"
"}")
if defaultValue is None:
default = None
elif isinstance(defaultValue, IDLNullValue):
assert type.nullable()
default = "None"
else:
assert defaultValue.type.tag() in (IDLType.Tags.domstring, IDLType.Tags.usvstring)
default = f'USVString("{defaultValue.value}".to_owned())'
if type.nullable():
default = f"Some({default})"
declType = "USVString"
if type.nullable():
declType = f"Option<{declType}>"
return handleOptional(conversionCode, CGGeneric(declType), default)
if type.isByteString():
assert not isEnforceRange and not isClamp
conversionCode = (
"match FromJSValConvertible::from_jsval(*cx, ${val}, ()) {\n"
" Ok(ConversionResult::Success(strval)) => strval,\n"
" Ok(ConversionResult::Failure(error)) => {\n"
f"{indent(failOrPropagate, 8)}\n"
" }\n"
f" _ => {{ {exceptionCode} }},\n"
"}")
if defaultValue is None:
default = None
elif isinstance(defaultValue, IDLNullValue):
assert type.nullable()
default = "None"
else:
assert defaultValue.type.tag() in (IDLType.Tags.domstring, IDLType.Tags.bytestring)
default = f'ByteString::new(b"{defaultValue.value}".to_vec())'
if type.nullable():
default = f"Some({default})"
declType = "ByteString"
if type.nullable():
declType = f"Option<{declType}>"
return handleOptional(conversionCode, CGGeneric(declType), default)
if type.isEnum():
assert not isEnforceRange and not isClamp
if type.nullable():
raise TypeError("We don't support nullable enumerated arguments "
"yet")
enum = type.inner.identifier.name
if invalidEnumValueFatal:
handleInvalidEnumValueCode = failureCode or f"throw_type_error(*cx, &error); {exceptionCode}"
else:
handleInvalidEnumValueCode = "return true;"
template = (
"match FromJSValConvertible::from_jsval(*cx, ${val}, ()) {"
f" Err(_) => {{ {exceptionCode} }},\n"
" Ok(ConversionResult::Success(v)) => v,\n"
f" Ok(ConversionResult::Failure(error)) => {{ {handleInvalidEnumValueCode} }},\n"
"}")
if defaultValue is not None:
assert defaultValue.type.tag() == IDLType.Tags.domstring
default = f"{enum}::{getEnumValueName(defaultValue.value)}"
else:
default = None
return handleOptional(template, CGGeneric(enum), default)
if type.isCallback():
assert not isEnforceRange and not isClamp
assert not type.treatNonCallableAsNull()
assert not type.treatNonObjectAsNull() or type.nullable()
assert not type.treatNonObjectAsNull() or not type.treatNonCallableAsNull()
callback = type.unroll().callback
declType = CGGeneric(f"{callback.identifier.name}<D>")
finalDeclType = CGTemplatedType("Rc", declType)
conversion = CGCallbackTempRoot(declType.define())
if type.nullable():
declType = CGTemplatedType("Option", declType)
finalDeclType = CGTemplatedType("Option", finalDeclType)
conversion = CGWrapper(conversion, pre="Some(", post=")")
if allowTreatNonObjectAsNull and type.treatNonObjectAsNull():
if not isDefinitelyObject:
haveObject = "${val}.get().is_object()"
template = CGIfElseWrapper(haveObject,
conversion,
CGGeneric("None")).define()
else:
template = conversion
else:
template = CGIfElseWrapper("IsCallable(${val}.get().to_object())",
conversion,
onFailureNotCallable(failureCode)).define()
template = wrapObjectTemplate(
template,
"None",
isDefinitelyObject,
type,
failureCode)
if defaultValue is not None:
assert allowTreatNonObjectAsNull
assert type.treatNonObjectAsNull()
assert type.nullable()
assert isinstance(defaultValue, IDLNullValue)
default = "None"
else:
default = None
return JSToNativeConversionInfo(template, default, finalDeclType)
if type.isAny():
assert not isEnforceRange and not isClamp
assert isMember != "Union"
if isMember in ("Dictionary", "Sequence") or isAutoRooted:
templateBody = "${val}.get()"
if defaultValue is None:
default = None
elif isinstance(defaultValue, IDLNullValue):
default = "NullValue()"
elif isinstance(defaultValue, IDLUndefinedValue):
default = "UndefinedValue()"
else:
raise TypeError("Can't handle non-null, non-undefined default value here")
if not isAutoRooted:
templateBody = f"RootedTraceableBox::from_box(Heap::boxed({templateBody}))"
if default is not None:
default = f"RootedTraceableBox::from_box(Heap::boxed({default}))"
declType = CGGeneric("RootedTraceableBox<Heap<JSVal>>")
# AutoRooter can trace properly inner raw GC thing pointers
else:
declType = CGGeneric("JSVal")
return handleOptional(templateBody, declType, default)
declType = CGGeneric("HandleValue")
if defaultValue is None:
default = None
elif isinstance(defaultValue, IDLNullValue):
default = "HandleValue::null()"
elif isinstance(defaultValue, IDLUndefinedValue):
default = "HandleValue::undefined()"
else:
raise TypeError("Can't handle non-null, non-undefined default value here")
return handleOptional("${val}", declType, default)
if type.isObject():
assert not isEnforceRange and not isClamp
templateBody = "${val}.get().to_object()"
default = "ptr::null_mut()"
if isMember in ("Dictionary", "Union", "Sequence") and not isAutoRooted:
templateBody = f"RootedTraceableBox::from_box(Heap::boxed({templateBody}))"
default = "RootedTraceableBox::new(Heap::default())"
declType = CGGeneric("RootedTraceableBox<Heap<*mut JSObject>>")
else:
# TODO: Need to root somehow
# https://github.com/servo/servo/issues/6382
declType = CGGeneric("*mut JSObject")
templateBody = wrapObjectTemplate(templateBody, default,
isDefinitelyObject, type, failureCode)
return handleOptional(templateBody, declType,
handleDefault(default))
if type.isDictionary():
# There are no nullable dictionaries
assert not type.nullable() or (isMember and isMember != "Dictionary")
typeName = f"{CGDictionary.makeModuleName(type.inner)}::{CGDictionary.makeDictionaryName(type.inner)}"
if containsDomInterface(type):
typeName += "<D>"
declType = CGGeneric(typeName)
empty = f"{typeName.replace('<D>', '')}::empty()"
if type_needs_tracing(type):
declType = CGTemplatedType("RootedTraceableBox", declType)
template = (
"match FromJSValConvertible::from_jsval(*cx, ${val}, ()) {\n"
" Ok(ConversionResult::Success(dictionary)) => dictionary,\n"
" Ok(ConversionResult::Failure(error)) => {\n"
f"{indent(failOrPropagate, 8)}\n"
" }\n"
f" _ => {{ {exceptionCode} }},\n"
"}")
return handleOptional(template, declType, handleDefault(empty))
if type.isUndefined():
# This one only happens for return values, and its easy: Just
# ignore the jsval.
return JSToNativeConversionInfo("", None, None)
if not type.isPrimitive():
raise TypeError(f"Need conversion for argument type '{type}'")
conversionBehavior = getConversionConfigForType(type, isEnforceRange, isClamp, treatNullAs)
if failureCode is None:
failureCode = 'return false'
declType = CGGeneric(builtinNames[type.tag()])
if type.nullable():
declType = CGWrapper(declType, pre="Option<", post=">")
template = (
f"match FromJSValConvertible::from_jsval(*cx, ${{val}}, {conversionBehavior}) {{\n"
" Ok(ConversionResult::Success(v)) => v,\n"
" Ok(ConversionResult::Failure(error)) => {\n"
f"{indent(failOrPropagate, 8)}\n"
" }\n"
f" _ => {{ {exceptionCode} }}\n"
"}")
if defaultValue is not None:
if isinstance(defaultValue, IDLNullValue):
assert type.nullable()
defaultStr = "None"
else:
tag = defaultValue.type.tag()
if tag in [IDLType.Tags.float, IDLType.Tags.double]:
defaultStr = f"Finite::wrap({defaultValue.value})"
elif tag in numericTags:
defaultStr = str(defaultValue.value)
else:
assert tag == IDLType.Tags.bool
defaultStr = toStringBool(defaultValue.value)
if type.nullable():
defaultStr = f"Some({defaultStr})"
else:
defaultStr = None
return handleOptional(template, declType, defaultStr)
def instantiateJSToNativeConversionTemplate(templateBody, replacements,
declType, declName,
needsAutoRoot=False):
"""
Take the templateBody and declType as returned by
getJSToNativeConversionInfo, a set of replacements as required by the
strings in such a templateBody, and a declName, and generate code to
convert into a stack Rust binding with that name.
"""
result = CGList([], "\n")
conversion = CGGeneric(string.Template(templateBody).substitute(replacements))
if declType is not None:
newDecl = [
CGGeneric("let "),
CGGeneric(declName),
CGGeneric(": "),
declType,
CGGeneric(" = "),
conversion,
CGGeneric(";"),
]
result.append(CGList(newDecl))
else:
result.append(conversion)
if needsAutoRoot:
result.append(CGGeneric(f"auto_root!(in(*cx) let {declName} = {declName});"))
# Add an empty CGGeneric to get an extra newline after the argument
# conversion.
result.append(CGGeneric(""))
return result
def convertConstIDLValueToJSVal(value):
if isinstance(value, IDLNullValue):
return "ConstantVal::NullVal"
tag = value.type.tag()
if tag in [IDLType.Tags.int8, IDLType.Tags.uint8, IDLType.Tags.int16,
IDLType.Tags.uint16, IDLType.Tags.int32]:
return f"ConstantVal::Int({value.value})"
if tag == IDLType.Tags.uint32:
return f"ConstantVal::Uint({value.value})"
if tag in [IDLType.Tags.int64, IDLType.Tags.uint64]:
return f"ConstantVal::Double({value.value} as f64)"
if tag == IDLType.Tags.bool:
return "ConstantVal::Bool(true)" if value.value else "ConstantVal::BoolVal(false)"
if tag in [IDLType.Tags.unrestricted_float, IDLType.Tags.float,
IDLType.Tags.unrestricted_double, IDLType.Tags.double]:
return f"ConstantVal::Double({value.value} as f64)"
raise TypeError(f"Const value of unhandled type: {value.type}")
class CGArgumentConverter(CGThing):
"""
A class that takes an IDL argument object, its index in the
argument list, and the argv and argc strings and generates code to
unwrap the argument to the right native type.
"""
def __init__(self, argument, index, args, argc, descriptorProvider,
invalidEnumValueFatal=True):
CGThing.__init__(self)
assert not argument.defaultValue or argument.optional
replacementVariables = {
"val": f"HandleValue::from_raw({args}.get({index}))",
}
info = getJSToNativeConversionInfo(
argument.type,
descriptorProvider,
invalidEnumValueFatal=invalidEnumValueFatal,
defaultValue=argument.defaultValue,
isMember="Variadic" if argument.variadic else False,
isAutoRooted=type_needs_auto_root(argument.type),
allowTreatNonObjectAsNull=argument.allowTreatNonCallableAsNull())
template = info.template
default = info.default
declType = info.declType
if not argument.variadic:
if argument.optional:
condition = f"{args}.get({index}).is_undefined()"
if argument.defaultValue:
assert default
template = CGIfElseWrapper(condition,
CGGeneric(default),
CGGeneric(template)).define()
else:
assert not default
declType = CGWrapper(declType, pre="Option<", post=">")
template = CGIfElseWrapper(condition,
CGGeneric("None"),
CGGeneric(f"Some({template})")).define()
else:
assert not default
arg = f"arg{index}"
self.converter = instantiateJSToNativeConversionTemplate(
template, replacementVariables, declType, arg,
needsAutoRoot=type_needs_auto_root(argument.type))
else:
assert argument.optional
variadicConversion = {
"val": f"HandleValue::from_raw({args}.get(variadicArg))",
}
innerConverter = [instantiateJSToNativeConversionTemplate(
template, variadicConversion, declType, "slot")]
arg = f"arg{index}"
if argument.type.isGeckoInterface():
init = f"rooted_vec!(let mut {arg})"
innerConverter.append(CGGeneric(f"{arg}.push(Dom::from_ref(&*slot));"))
else:
init = f"let mut {arg} = vec![]"
innerConverter.append(CGGeneric(f"{arg}.push(slot);"))
inner = CGIndenter(CGList(innerConverter, "\n"), 8).define()
sub = "" if index == 0 else f"- {index}"
self.converter = CGGeneric(f"""
{init};
if {argc} > {index} {{
{arg}.reserve({argc} as usize{sub});
for variadicArg in {index}..{argc} {{
{inner}
}}
}}""")
def define(self):
return self.converter.define()
def wrapForType(jsvalRef, result='result', successCode='true', pre=''):
"""
Reflect a Rust value into JS.
* 'jsvalRef': a MutableHandleValue in which to store the result
of the conversion;
* 'result': the name of the variable in which the Rust value is stored;
* 'successCode': the code to run once we have done the conversion.
* 'pre': code to run before the conversion if rooting is necessary
"""
wrap = f"{pre}\n({result}).to_jsval(*cx, {jsvalRef});"
if successCode:
wrap += f"\n{successCode}"
return wrap
def typeNeedsCx(type, retVal=False):
if type is None:
return False
if type.nullable():
type = type.inner
if type.isSequence():
type = type.inner
if type.isUnion():
return any(typeNeedsCx(t) for t in type.unroll().flatMemberTypes)
if retVal and type.isSpiderMonkeyInterface():
return True
return type.isAny() or type.isObject()
def returnTypeNeedsOutparam(type):
if type.nullable():
type = type.inner
return type.isAny()
def outparamTypeFromReturnType(type):
if type.isAny():
return "MutableHandleValue"
raise f"Don't know how to handle {type} as an outparam"
# Returns a conversion behavior suitable for a type
def getConversionConfigForType(type, isEnforceRange, isClamp, treatNullAs):
if type.isSequence() or type.isRecord():
return getConversionConfigForType(innerContainerType(type), isEnforceRange, isClamp, treatNullAs)
if type.isDOMString():
assert not isEnforceRange and not isClamp
treatAs = {
"Default": "StringificationBehavior::Default",
"EmptyString": "StringificationBehavior::Empty",
}
if treatNullAs not in treatAs:
raise TypeError(f"We don't support [TreatNullAs={treatNullAs}]")
if type.nullable():
# Note: the actual behavior passed here doesn't matter for nullable
# strings.
return "StringificationBehavior::Default"
else:
return treatAs[treatNullAs]
if type.isPrimitive() and type.isInteger():
if isEnforceRange:
return "ConversionBehavior::EnforceRange"
elif isClamp:
return "ConversionBehavior::Clamp"
else:
return "ConversionBehavior::Default"
assert not isEnforceRange and not isClamp
return "()"
def builtin_return_type(returnType):
result = CGGeneric(builtinNames[returnType.tag()])
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
# Returns a CGThing containing the type of the return value.
def getRetvalDeclarationForType(returnType, descriptorProvider):
if returnType is None or returnType.isUndefined():
# Nothing to declare
return CGGeneric("()")
if returnType.isPrimitive() and returnType.tag() in builtinNames:
return builtin_return_type(returnType)
if is_typed_array(returnType) and returnType.tag() in builtinNames:
return builtin_return_type(returnType)
if returnType.isDOMString():
result = CGGeneric("DOMString")
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isUSVString():
result = CGGeneric("USVString")
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isByteString():
result = CGGeneric("ByteString")
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isEnum():
result = CGGeneric(returnType.unroll().inner.identifier.name)
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isPromise():
assert not returnType.nullable()
return CGGeneric("Rc<D::Promise>")
if returnType.isGeckoInterface():
descriptor = descriptorProvider.getDescriptor(
returnType.unroll().inner.identifier.name)
result = CGGeneric(descriptor.returnType)
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isCallback():
callback = returnType.unroll().callback
result = CGGeneric(f'Rc<{getModuleFromObject(callback)}::{callback.identifier.name}<D>>')
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isUnion():
result = CGGeneric(union_native_type(returnType))
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isAny():
return CGGeneric("JSVal")
if returnType.isObject() or returnType.isSpiderMonkeyInterface():
result = CGGeneric("NonNull<JSObject>")
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isSequence() or returnType.isRecord():
result = getRetvalDeclarationForType(innerContainerType(returnType), descriptorProvider)
result = wrapInNativeContainerType(returnType, result)
if returnType.nullable():
result = CGWrapper(result, pre="Option<", post=">")
return result
if returnType.isDictionary():
nullable = returnType.nullable()
dictName = returnType.inner.name if nullable else returnType.name
generic = "<D>" if containsDomInterface(returnType) else ""
result = CGGeneric(f"{dictName}{generic}")
if type_needs_tracing(returnType):
result = CGWrapper(result, pre="RootedTraceableBox<", post=">")
if nullable:
result = CGWrapper(result, pre="Option<", post=">")
return result
raise TypeError(f"Don't know how to declare return value for {returnType}")
def MemberCondition(pref, func, exposed, secure):
"""
A string representing the condition for a member to actually be exposed.
Any of the arguments can be None. If not None, they should have the
following types:
pref: The name of the preference.
func: The name of the function.
exposed: One or more names of an exposed global.
secure: Requires secure context.
"""
assert pref is None or isinstance(pref, str)
assert func is None or isinstance(func, str)
assert exposed is None or isinstance(exposed, set)
assert func is None or pref is None or exposed is None or secure is None
conditions = []
if secure:
conditions.append('Condition::SecureContext()')
if pref:
conditions.append(f'Condition::Pref("{pref}")')
if func:
conditions.append(f'Condition::Func(D::{func})')
if exposed:
conditions.extend([
f"Condition::Exposed(Globals::{camel_to_upper_snake(i)})" for i in exposed
])
if len(conditions) == 0:
conditions.append("Condition::Satisfied")
return conditions
class PropertyDefiner:
"""
A common superclass for defining things on prototype objects.
Subclasses should implement generateArray to generate the actual arrays of
things we're defining. They should also set self.regular to the list of
things exposed to web pages.
"""
def __init__(self, descriptor, name):
self.descriptor = descriptor
self.name = name
def variableName(self):
return f"s{self.name}"
def length(self):
return len(self.regular)
def __str__(self):
# We only need to generate id arrays for things that will end
# up used via ResolveProperty or EnumerateProperties.
return self.generateArray(self.regular, self.variableName())
@staticmethod
def getStringAttr(member, name):
attr = member.getExtendedAttribute(name)
if attr is None:
return None
# It's a list of strings
assert len(attr) == 1
assert attr[0] is not None
return attr[0]
@staticmethod
def getControllingCondition(interfaceMember, descriptor):
return MemberCondition(
PropertyDefiner.getStringAttr(interfaceMember,
"Pref"),
PropertyDefiner.getStringAttr(interfaceMember,
"Func"),
interfaceMember.exposureSet,
interfaceMember.getExtendedAttribute("SecureContext"))
def generateGuardedArray(self, array, name, specTemplate, specTerminator,
specType, getCondition, getDataTuple):
"""
This method generates our various arrays.
array is an array of interface members as passed to generateArray
name is the name as passed to generateArray
specTemplate is a template for each entry of the spec array
specTerminator is a terminator for the spec array (inserted at the end
of the array), or None
specType is the actual typename of our spec
getDataTuple is a callback function that takes an array entry and
returns a tuple suitable for substitution into specTemplate.
"""
# We generate an all-encompassing list of lists of specs, with each sublist
# representing a group of members that share a common pref name. That will
# make sure the order of the properties as exposed on the interface and
# interface prototype objects does not change when pref control is added to
# members while still allowing us to define all the members in the smallest
# number of JSAPI calls.
assert len(array) != 0
specs = []
prefableSpecs = []
prefableTemplate = ' Guard::new(%s, (%s)[%d])'
origTemplate = specTemplate
if isinstance(specTemplate, str):
specTemplate = lambda _: origTemplate # noqa
for cond, members in groupby(array, lambda m: getCondition(m, self.descriptor)):
currentSpecs = [specTemplate(m) % getDataTuple(m) for m in members]
if specTerminator:
currentSpecs.append(specTerminator)
joinedCurrentSpecs = ',\n'.join(currentSpecs)
specs.append(f"&Box::leak(Box::new([\n{joinedCurrentSpecs}]))[..]\n")
conds = ','.join(cond) if isinstance(cond, list) else cond
prefableSpecs.append(
prefableTemplate % (f"&[{conds}]", f"unsafe {{ {name}_specs.get() }}", len(specs) - 1)
)
joinedSpecs = ',\n'.join(specs)
specsArray = f"static {name}_specs: ThreadUnsafeOnceLock<&[&[{specType}]]> = ThreadUnsafeOnceLock::new();\n"
initSpecs = f"""
pub(crate) fn init_{name}_specs<D: DomTypes>() {{
{name}_specs.set(Box::leak(Box::new([{joinedSpecs}])));
}}"""
joinedPrefableSpecs = ',\n'.join(prefableSpecs)
prefArray = f"static {name}: ThreadUnsafeOnceLock<&[Guard<&[{specType}]>]> = ThreadUnsafeOnceLock::new();\n"
initPrefs = f"""
pub(crate) fn init_{name}_prefs<D: DomTypes>() {{
{name}.set(Box::leak(Box::new([{joinedPrefableSpecs}])));
}}"""
return f"{specsArray}{initSpecs}{prefArray}{initPrefs}"
def generateUnguardedArray(self, array, name, specTemplate, specTerminator,
specType, getCondition, getDataTuple):
"""
Takes the same set of parameters as generateGuardedArray but instead
generates a single, flat array of type `&[specType]` that contains all
provided members. The provided members' conditions shall be homogeneous,
or else this method will fail.
"""
# this method can't handle heterogeneous condition
groups = groupby(array, lambda m: getCondition(m, self.descriptor))
assert len(list(groups)) == 1
origTemplate = specTemplate
if isinstance(specTemplate, str):
specTemplate = lambda _: origTemplate # noqa
specsArray = [specTemplate(m) % getDataTuple(m) for m in array]
specsArray.append(specTerminator)
joinedSpecs = ',\n'.join(specsArray)
initialSpecs = f"static {name}: ThreadUnsafeOnceLock<&[{specType}]> = ThreadUnsafeOnceLock::new();\n"
initSpecs = f"""
pub(crate) fn init_{name}<D: DomTypes>() {{
{name}.set(Box::leak(Box::new([{joinedSpecs}])));
}}"""
return dedent(f"{initialSpecs}{initSpecs}")
# The length of a method is the minimum of the lengths of the
# argument lists of all its overloads.
def methodLength(method):
signatures = method.signatures()
return min(
len([arg for arg in arguments if not arg.optional and not arg.variadic])
for (_, arguments) in signatures)
class MethodDefiner(PropertyDefiner):
"""
A class for defining methods on a prototype object.
"""
def __init__(self, descriptor, name, static, unforgeable, crossorigin=False):
assert not (static and unforgeable)
assert not (static and crossorigin)
assert not (unforgeable and crossorigin)
PropertyDefiner.__init__(self, descriptor, name)
# TODO: Separate the `(static, unforgeable, crossorigin) = (False, False, True)` case
# to a separate class or something.
# FIXME https://bugzilla.mozilla.org/show_bug.cgi?id=772822
# We should be able to check for special operations without an
# identifier. For now we check if the name starts with __
# Ignore non-static methods for callback interfaces
if not descriptor.interface.isCallback() or static:
methods = [m for m in descriptor.interface.members if
m.isMethod() and m.isStatic() == static
and (bool(m.getExtendedAttribute("CrossOriginCallable")) or not crossorigin)
and not m.isIdentifierLess()
and (MemberIsLegacyUnforgeable(m, descriptor) == unforgeable or crossorigin)]
else:
methods = []
self.regular = [{"name": m.identifier.name,
"methodInfo": not m.isStatic(),
"length": methodLength(m),
"flags": "JSPROP_READONLY" if crossorigin else "JSPROP_ENUMERATE",
"condition": PropertyDefiner.getControllingCondition(m, descriptor),
"returnsPromise": m.returnsPromise()}
for m in methods]
# TODO: Once iterable is implemented, use tiebreak rules instead of
# failing. Also, may be more tiebreak rules to implement once spec bug
# is resolved.
# https://www.w3.org/Bugs/Public/show_bug.cgi?id=28592
def hasIterator(methods, regular):
return (any("@@iterator" in m.aliases for m in methods)
or any("@@iterator" == r["name"] for r in regular))
# Check whether we need to output an @@iterator due to having an indexed
# getter. We only do this while outputting non-static and
# non-unforgeable methods, since the @@iterator function will be
# neither.
if (not static
and not unforgeable
and not crossorigin
and descriptor.supportsIndexedProperties()): # noqa
if hasIterator(methods, self.regular): # noqa
raise TypeError("Cannot have indexed getter/attr on "
f"interface {self.descriptor.interface.identifier.name} with other members "
"that generate @@iterator, such as "
"maplike/setlike or aliased functions.")
self.regular.append({"name": '@@iterator',
"methodInfo": False,
"selfHostedName": "$ArrayValues",
"length": 0,
"flags": "0", # Not enumerable, per spec.
"condition": "Condition::Satisfied"})
# Generate the keys/values/entries aliases for value iterables.
maplikeOrSetlikeOrIterable = descriptor.interface.maplikeOrSetlikeOrIterable
if (not static and not unforgeable and not crossorigin
and maplikeOrSetlikeOrIterable
and maplikeOrSetlikeOrIterable.isIterable()
and maplikeOrSetlikeOrIterable.isValueIterator()):
m = maplikeOrSetlikeOrIterable
# Add our keys/values/entries/forEach
self.regular.append({
"name": "keys",
"methodInfo": False,
"selfHostedName": "ArrayKeys",
"length": 0,
"flags": "JSPROP_ENUMERATE",
"condition": PropertyDefiner.getControllingCondition(m,
descriptor)
})
self.regular.append({
"name": "values",
"methodInfo": False,
"selfHostedName": "$ArrayValues",
"length": 0,
"flags": "JSPROP_ENUMERATE",
"condition": PropertyDefiner.getControllingCondition(m,
descriptor)
})
self.regular.append({
"name": "entries",
"methodInfo": False,
"selfHostedName": "ArrayEntries",
"length": 0,
"flags": "JSPROP_ENUMERATE",
"condition": PropertyDefiner.getControllingCondition(m,
descriptor)
})
self.regular.append({
"name": "forEach",
"methodInfo": False,
"selfHostedName": "ArrayForEach",
"length": 1,
"flags": "JSPROP_ENUMERATE",
"condition": PropertyDefiner.getControllingCondition(m,
descriptor)
})
isLegacyUnforgeableInterface = bool(descriptor.interface.getExtendedAttribute("LegacyUnforgeable"))
if not static and unforgeable == isLegacyUnforgeableInterface and not crossorigin:
stringifier = descriptor.operations['Stringifier']
if stringifier:
self.regular.append({
"name": "toString",
"nativeName": stringifier.identifier.name,
"length": 0,
"flags": "JSPROP_ENUMERATE",
"condition": PropertyDefiner.getControllingCondition(stringifier, descriptor)
})
self.unforgeable = unforgeable
self.crossorigin = crossorigin
def generateArray(self, array, name):
if len(array) == 0:
return ""
def condition(m, d):
return m["condition"]
def specData(m):
flags = m["flags"]
if self.unforgeable:
flags += " | JSPROP_PERMANENT | JSPROP_READONLY"
if flags != "0":
flags = f"({flags}) as u16"
if "selfHostedName" in m:
selfHostedName = str_to_cstr_ptr(m["selfHostedName"])
assert not m.get("methodInfo", True)
accessor = "None"
jitinfo = "ptr::null()"
else:
selfHostedName = "ptr::null()"
if m.get("methodInfo", True):
if m.get("returnsPromise", False):
exceptionToRejection = "true"
else:
exceptionToRejection = "false"
identifier = m.get("nativeName", m["name"])
# Go through an intermediate type here, because it's not
# easy to tell whether the methodinfo is a JSJitInfo or
# a JSTypedMethodJitInfo here. The compiler knows, though,
# so let it do the work.
jitinfo = (f"unsafe {{ {identifier}_methodinfo.get() }}"
" as *const _ as *const JSJitInfo")
accessor = f"Some(generic_method::<{exceptionToRejection}>)"
else:
if m.get("returnsPromise", False):
jitinfo = f"unsafe {{ {m.get('nativeName', m['name'])}_methodinfo.get() }}"
accessor = "Some(generic_static_promise_method)"
else:
jitinfo = "ptr::null()"
accessor = f'Some({m.get("nativeName", m["name"])}::<D>)'
if m["name"].startswith("@@"):
assert not self.crossorigin
name = f'JSPropertySpec_Name {{ symbol_: SymbolCode::{m["name"][2:]} as usize + 1 }}'
else:
name = f'JSPropertySpec_Name {{ string_: {str_to_cstr_ptr(m["name"])} }}'
return (name, accessor, jitinfo, m["length"], flags, selfHostedName)
specTemplate = (
' JSFunctionSpec {\n'
' name: %s,\n'
' call: JSNativeWrapper { op: %s, info: %s },\n'
' nargs: %s,\n'
' flags: %s,\n'
' selfHostedName: %s\n'
' }')
specTerminator = (
' JSFunctionSpec {\n'
' name: JSPropertySpec_Name { string_: ptr::null() },\n'
' call: JSNativeWrapper { op: None, info: ptr::null() },\n'
' nargs: 0,\n'
' flags: 0,\n'
' selfHostedName: ptr::null()\n'
' }')
if self.crossorigin:
return self.generateUnguardedArray(
array, name,
specTemplate, specTerminator,
'JSFunctionSpec',
condition, specData)
else:
return self.generateGuardedArray(
array, name,
specTemplate, specTerminator,
'JSFunctionSpec',
condition, specData)
class AttrDefiner(PropertyDefiner):
def __init__(self, descriptor, name, static, unforgeable, crossorigin=False):
assert not (static and unforgeable)
assert not (static and crossorigin)
assert not (unforgeable and crossorigin)
PropertyDefiner.__init__(self, descriptor, name)
# TODO: Separate the `(static, unforgeable, crossorigin) = (False, False, True)` case
# to a separate class or something.
self.name = name
self.descriptor = descriptor
self.regular = [
{
"name": m.identifier.name,
"attr": m,
"flags": "JSPROP_ENUMERATE",
"kind": "JSPropertySpec_Kind::NativeAccessor",
}
for m in descriptor.interface.members if
m.isAttr() and m.isStatic() == static
and (MemberIsLegacyUnforgeable(m, descriptor) == unforgeable or crossorigin)
and (not crossorigin
or m.getExtendedAttribute("CrossOriginReadable")
or m.getExtendedAttribute("CrossOriginWritable"))
]
self.static = static
self.unforgeable = unforgeable
self.crossorigin = crossorigin
if not static and not unforgeable and not crossorigin and not (
descriptor.interface.isNamespace() or descriptor.interface.isCallback()
):
self.regular.append({
"name": "@@toStringTag",
"attr": None,
"flags": "JSPROP_READONLY",
"kind": "JSPropertySpec_Kind::Value",
})
def generateArray(self, array, name):
if len(array) == 0:
return ""
def getter(attr):
attr = attr['attr']
if self.crossorigin and not attr.getExtendedAttribute("CrossOriginReadable"):
return "JSNativeWrapper { op: None, info: ptr::null() }"
if self.static:
accessor = f'get_{self.descriptor.internalNameFor(attr.identifier.name)}::<D>'
jitinfo = "ptr::null()"
else:
if attr.type.isPromise():
exceptionToRejection = "true"
else:
exceptionToRejection = "false"
if attr.hasLegacyLenientThis():
accessor = f"generic_lenient_getter::<{exceptionToRejection}>"
else:
accessor = f"generic_getter::<{exceptionToRejection}>"
internalName = self.descriptor.internalNameFor(attr.identifier.name)
jitinfo = f"unsafe {{ {internalName}_getterinfo.get() }}"
return f"JSNativeWrapper {{ op: Some({accessor}), info: {jitinfo} }}"
def setter(attr):
attr = attr['attr']
if ((self.crossorigin and not attr.getExtendedAttribute("CrossOriginWritable"))
or (attr.readonly
and not attr.getExtendedAttribute("PutForwards")
and not attr.getExtendedAttribute("Replaceable"))):
return "JSNativeWrapper { op: None, info: ptr::null() }"
if self.static:
accessor = f'set_{self.descriptor.internalNameFor(attr.identifier.name)}::<D>'
jitinfo = "ptr::null()"
else:
if attr.hasLegacyLenientThis():
accessor = "generic_lenient_setter"
else:
accessor = "generic_setter"
internalName = self.descriptor.internalNameFor(attr.identifier.name)
jitinfo = f"unsafe {{ {internalName}_setterinfo.get() }}"
return f"JSNativeWrapper {{ op: Some({accessor}), info: {jitinfo} }}"
def condition(m, d):
if m["name"] == "@@toStringTag":
return MemberCondition(pref=None, func=None, exposed=None, secure=None)
return PropertyDefiner.getControllingCondition(m["attr"], d)
def specData(attr):
if attr["name"] == "@@toStringTag":
return (attr["name"][2:], attr["flags"], attr["kind"],
str_to_cstr_ptr(self.descriptor.interface.getClassName()))
flags = attr["flags"]
if self.unforgeable:
flags += " | JSPROP_PERMANENT"
return (str_to_cstr_ptr(attr["attr"].identifier.name), flags, attr["kind"], getter(attr),
setter(attr))
def template(m):
if m["name"] == "@@toStringTag":
return """ JSPropertySpec {
name: JSPropertySpec_Name { symbol_: SymbolCode::%s as usize + 1 },
attributes_: (%s),
kind_: (%s),
u: JSPropertySpec_AccessorsOrValue {
value: JSPropertySpec_ValueWrapper {
type_: JSPropertySpec_ValueWrapper_Type::String,
__bindgen_anon_1: JSPropertySpec_ValueWrapper__bindgen_ty_1 {
string: %s,
}
}
}
}
"""
return """ JSPropertySpec {
name: JSPropertySpec_Name { string_: %s },
attributes_: (%s),
kind_: (%s),
u: JSPropertySpec_AccessorsOrValue {
accessors: JSPropertySpec_AccessorsOrValue_Accessors {
getter: JSPropertySpec_Accessor {
native: %s,
},
setter: JSPropertySpec_Accessor {
native: %s,
}
}
}
}
"""
if self.crossorigin:
return self.generateUnguardedArray(
array, name,
template,
' JSPropertySpec::ZERO',
'JSPropertySpec',
condition, specData)
else:
return self.generateGuardedArray(
array, name,
template,
' JSPropertySpec::ZERO',
'JSPropertySpec',
condition, specData)
class ConstDefiner(PropertyDefiner):
"""
A class for definining constants on the interface object
"""
def __init__(self, descriptor, name):
PropertyDefiner.__init__(self, descriptor, name)
self.name = name
self.regular = [m for m in descriptor.interface.members if m.isConst()]
def generateArray(self, array, name):
if len(array) == 0:
return ""
def specData(const):
return (str_to_cstr(const.identifier.name),
convertConstIDLValueToJSVal(const.value))
return self.generateGuardedArray(
array, name,
' ConstantSpec { name: %s, value: %s }',
None,
'ConstantSpec',
PropertyDefiner.getControllingCondition, specData)
# We'll want to insert the indent at the beginnings of lines, but we
# don't want to indent empty lines. So only indent lines that have a
# non-newline character on them.
lineStartDetector = re.compile("^(?=[^\n])", re.MULTILINE)
class CGIndenter(CGThing):
"""
A class that takes another CGThing and generates code that indents that
CGThing by some number of spaces. The default indent is two spaces.
"""
def __init__(self, child, indentLevel=4):
CGThing.__init__(self)
self.child = child
self.indent = " " * indentLevel
def define(self):
defn = self.child.define()
if defn != "":
return re.sub(lineStartDetector, self.indent, defn)
else:
return defn
class CGWrapper(CGThing):
"""
Generic CGThing that wraps other CGThings with pre and post text.
"""
def __init__(self, child, pre="", post="", reindent=False):
CGThing.__init__(self)
self.child = child
self.pre = pre
self.post = post
self.reindent = reindent
def define(self):
defn = self.child.define()
if self.reindent:
# We don't use lineStartDetector because we don't want to
# insert whitespace at the beginning of our _first_ line.
defn = stripTrailingWhitespace(
defn.replace("\n", f"\n{' ' * len(self.pre)}"))
return f"{self.pre}{defn}{self.post}"
class CGRecord(CGThing):
"""
CGThing that wraps value CGThing in record with key type equal to keyType parameter
"""
def __init__(self, keyType, value):
CGThing.__init__(self)
assert keyType.isString()
self.keyType = keyType
self.value = value
def define(self):
if self.keyType.isByteString():
keyDef = "ByteString"
elif self.keyType.isDOMString():
keyDef = "DOMString"
elif self.keyType.isUSVString():
keyDef = "USVString"
else:
assert False
defn = f"{keyDef}, {self.value.define()}"
return f"Record<{defn}>"
class CGImports(CGWrapper):
"""
Generates the appropriate import/use statements.
"""
def __init__(self, child, descriptors, callbacks, dictionaries, enums, typedefs, imports, config):
"""
Adds a set of imports.
"""
def componentTypes(type):
if type.isType() and type.nullable():
type = type.unroll()
if type.isUnion():
return type.flatMemberTypes
if type.isDictionary():
return [type] + getTypesFromDictionary(type)
if type.isSequence():
return componentTypes(type.inner)
return [type]
def isImportable(type):
if not type.isType():
assert (type.isInterface() or type.isDictionary()
or type.isEnum() or type.isNamespace())
return True
return not (type.builtin or type.isSequence() or type.isUnion())
def relatedTypesForSignatures(method):
types = []
for (returnType, arguments) in method.signatures():
types += componentTypes(returnType)
for arg in arguments:
types += componentTypes(arg.type)
return types
def getIdentifier(t):
if t.isType():
if t.nullable():
t = t.inner
if t.isCallback():
return t.callback.identifier
return t.identifier
assert t.isInterface() or t.isDictionary() or t.isEnum() or t.isNamespace()
return t.identifier
def removeWrapperAndNullableTypes(types):
normalized = []
for t in types:
while (t.isType() and t.nullable()) or isinstance(t, IDLWrapperType):
t = t.inner
if isImportable(t):
normalized += [t]
return normalized
types = []
descriptorProvider = config.getDescriptorProvider()
for d in descriptors:
if not d.interface.isCallback():
types += [d.interface]
if d.interface.isIteratorInterface():
types += [d.interface.iterableInterface]
members = d.interface.members + d.interface.legacyFactoryFunctions
constructor = d.interface.ctor()
if constructor:
members += [constructor]
if d.proxy:
members += [o for o in list(d.operations.values()) if o]
for m in members:
if m.isMethod():
types += relatedTypesForSignatures(m)
if m.isStatic():
types += [
descriptorProvider.getDescriptor(iface).interface
for iface in d.interface.exposureSet
]
elif m.isAttr():
types += componentTypes(m.type)
# Import the type names used in the callbacks that are being defined.
for c in callbacks:
types += relatedTypesForSignatures(c)
# Import the type names used in the dictionaries that are being defined.
for d in dictionaries:
types += componentTypes(d)
# Import the type names used in the typedefs that are being defined.
for t in typedefs:
if not t.innerType.isCallback():
types += componentTypes(t.innerType)
# Normalize the types we've collected and remove any ones which can't be imported.
types = removeWrapperAndNullableTypes(types)
descriptorProvider = config.getDescriptorProvider()
extras = []
for t in types:
# Importing these callbacks in the same module that defines them is an error.
if t.isCallback():
if getIdentifier(t) in [c.identifier for c in callbacks]:
continue
# Importing these types in the same module that defines them is an error.
if t in dictionaries or t in enums:
continue
if t.isInterface() or t.isNamespace():
name = getIdentifier(t).name
descriptor = descriptorProvider.getDescriptor(name)
parentName = descriptor.getParentName()
while parentName:
descriptor = descriptorProvider.getDescriptor(parentName)
extras += [descriptor.bindingPath]
parentName = descriptor.getParentName()
elif t.isType() and t.isRecord():
extras += ['crate::record::Record']
elif isinstance(t, IDLPromiseType):
pass
else:
if t.isEnum():
extras += [f'{getModuleFromObject(t)}::{getIdentifier(t).name}Values']
extras += [f'{getModuleFromObject(t)}::{getIdentifier(t).name}']
statements = []
statements.extend(f'use {i};' for i in sorted(set(imports + extras)))
joinedStatements = '\n'.join(statements)
CGWrapper.__init__(self, child,
pre=f'{joinedStatements}\n\n')
class CGIfWrapper(CGWrapper):
def __init__(self, condition, child):
pre = CGWrapper(CGGeneric(condition), pre="if ", post=" {\n",
reindent=True)
CGWrapper.__init__(self, CGIndenter(child), pre=pre.define(),
post="\n}")
class CGTemplatedType(CGWrapper):
def __init__(self, templateName, child):
CGWrapper.__init__(self, child, pre=f"{templateName}<", post=">")
class CGNamespace(CGWrapper):
def __init__(self, namespace, child, public=False):
pub = "pub " if public else ""
pre = f"{pub}mod {namespace} {{\n"
post = f"}} // mod {namespace}"
CGWrapper.__init__(self, child, pre=pre, post=post)
@staticmethod
def build(namespaces, child, public=False):
"""
Static helper method to build multiple wrapped namespaces.
"""
if not namespaces:
return child
inner = CGNamespace.build(namespaces[1:], child, public=public)
return CGNamespace(namespaces[0], inner, public=public)
def DOMClassTypeId(desc):
protochain = desc.prototypeChain
inner = ""
if desc.hasDescendants():
if desc.interface.getExtendedAttribute("Abstract"):
return "crate::codegen::InheritTypes::TopTypeId { abstract_: () }"
name = desc.interface.identifier.name
inner = f"(crate::codegen::InheritTypes::{name}TypeId::{name})"
elif len(protochain) == 1:
return "crate::codegen::InheritTypes::TopTypeId { alone: () }"
reversed_protochain = list(reversed(protochain))
for (child, parent) in zip(reversed_protochain, reversed_protochain[1:]):
inner = f"(crate::codegen::InheritTypes::{parent}TypeId::{child}{inner})"
return f"crate::codegen::InheritTypes::TopTypeId {{ {protochain[0].lower()}: {inner} }}"
def DOMClass(descriptor):
protoList = [f'PrototypeList::ID::{proto}' for proto in descriptor.prototypeChain]
# Pad out the list to the right length with ID::Last so we
# guarantee that all the lists are the same length. ID::Last
# is never the ID of any prototype, so it's safe to use as
# padding.
protoList.extend(['PrototypeList::ID::Last'] * (descriptor.config.maxProtoChainLength - len(protoList)))
prototypeChainString = ', '.join(protoList)
mallocSizeOf = f"malloc_size_of_including_raw_self::<{descriptor.concreteType}>"
if descriptor.isGlobal():
globals_ = camel_to_upper_snake(descriptor.name)
else:
globals_ = 'EMPTY'
return f"""
DOMClass {{
interface_chain: [ {prototypeChainString} ],
depth: {descriptor.prototypeDepth},
type_id: {DOMClassTypeId(descriptor)},
malloc_size_of: {mallocSizeOf} as unsafe fn(&mut _, _) -> _,
global: Globals::{globals_},
}}"""
class CGDOMJSClass(CGThing):
"""
Generate a DOMJSClass for a given descriptor
"""
def __init__(self, descriptor):
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
parentName = self.descriptor.getParentName()
if not parentName:
parentName = "Reflector"
args = {
"domClass": DOMClass(self.descriptor),
"enumerateHook": "None",
"finalizeHook": f"{FINALIZE_HOOK_NAME}::<D>",
"flags": "JSCLASS_FOREGROUND_FINALIZE",
"name": str_to_cstr_ptr(self.descriptor.interface.identifier.name),
"resolveHook": "None",
"slots": "1",
"traceHook": f"{TRACE_HOOK_NAME}::<D>",
}
if self.descriptor.isGlobal():
assert not self.descriptor.weakReferenceable
args["enumerateHook"] = "Some(enumerate_global::<D>)"
args["flags"] = "JSCLASS_IS_GLOBAL | JSCLASS_DOM_GLOBAL | JSCLASS_FOREGROUND_FINALIZE"
args["slots"] = "JSCLASS_GLOBAL_SLOT_COUNT + 1"
args["resolveHook"] = "Some(resolve_global::<D>)"
args["traceHook"] = "js::jsapi::JS_GlobalObjectTraceHook"
elif self.descriptor.weakReferenceable:
args["slots"] = "2"
return f"""
static CLASS_OPS: ThreadUnsafeOnceLock<JSClassOps> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_class_ops<D: DomTypes>() {{
CLASS_OPS.set(JSClassOps {{
addProperty: None,
delProperty: None,
enumerate: None,
newEnumerate: {args['enumerateHook']},
resolve: {args['resolveHook']},
mayResolve: None,
finalize: Some({args['finalizeHook']}),
call: None,
construct: None,
trace: Some({args['traceHook']}),
}});
}}
pub static Class: ThreadUnsafeOnceLock<DOMJSClass> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_domjs_class<D: DomTypes>() {{
init_class_ops::<D>();
Class.set(DOMJSClass {{
base: JSClass {{
name: {args['name']},
flags: JSCLASS_IS_DOMJSCLASS | {args['flags']} |
((({args['slots']}) & JSCLASS_RESERVED_SLOTS_MASK) << JSCLASS_RESERVED_SLOTS_SHIFT)
/* JSCLASS_HAS_RESERVED_SLOTS({args['slots']}) */,
cOps: unsafe {{ CLASS_OPS.get() }},
spec: ptr::null(),
ext: ptr::null(),
oOps: ptr::null(),
}},
dom_class: {args['domClass']},
}});
}}
"""
class CGAssertInheritance(CGThing):
"""
Generate a type assertion for inheritance
"""
def __init__(self, descriptor):
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
parent = self.descriptor.interface.parent
parentName = ""
if parent:
parentName = parent.identifier.name
else:
parentName = "Reflector"
selfName = self.descriptor.interface.identifier.name
if selfName == "OffscreenCanvasRenderingContext2D":
# OffscreenCanvasRenderingContext2D embeds a CanvasRenderingContext2D
# instead of a Reflector as an optimization,
# but this is fine since CanvasRenderingContext2D
# also has a reflector
#
# FIXME *RenderingContext2D should use Inline
parentName = "crate::dom::canvasrenderingcontext2d::CanvasRenderingContext2D"
args = {
"parentName": parentName,
"selfName": selfName,
}
return f"""
impl {args['selfName']} {{
fn __assert_parent_type(&self) {{
use crate::dom::bindings::inheritance::HasParent;
// If this type assertion fails, make sure the first field of your
// DOM struct is of the correct type -- it must be the parent class.
let _: &{args['parentName']} = self.as_parent();
}}
}}
"""
def str_to_cstr(s):
return f'c"{s}"'
def str_to_cstr_ptr(s):
return f'c"{s}".as_ptr()'
class CGPrototypeJSClass(CGThing):
def __init__(self, descriptor):
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
name = str_to_cstr_ptr(f"{self.descriptor.interface.identifier.name}Prototype")
slotCount = 0
if self.descriptor.hasLegacyUnforgeableMembers:
slotCount += 1
slotCountStr = f"{slotCount} & JSCLASS_RESERVED_SLOTS_MASK" if slotCount > 0 else "0"
return f"""
static PrototypeClass: JSClass = JSClass {{
name: {name},
flags:
// JSCLASS_HAS_RESERVED_SLOTS()
({slotCountStr} ) << JSCLASS_RESERVED_SLOTS_SHIFT,
cOps: ptr::null(),
spec: ptr::null(),
ext: ptr::null(),
oOps: ptr::null(),
}};
"""
class CGInterfaceObjectJSClass(CGThing):
def __init__(self, descriptor):
assert descriptor.interface.hasInterfaceObject() and not descriptor.interface.isCallback()
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
if self.descriptor.interface.isNamespace():
classString = self.descriptor.interface.getExtendedAttribute("ClassString")
if classString:
classString = classString[0]
else:
classString = "Object"
return f"""
static NAMESPACE_OBJECT_CLASS: NamespaceObjectClass = unsafe {{
NamespaceObjectClass::new({str_to_cstr(classString)})
}};
"""
if self.descriptor.interface.ctor():
constructorBehavior = f"InterfaceConstructorBehavior::call({CONSTRUCT_HOOK_NAME}::<D>)"
else:
constructorBehavior = "InterfaceConstructorBehavior::throw()"
name = self.descriptor.interface.identifier.name
representation = f'b"function {name}() {{\\n [native code]\\n}}"'
return f"""
static INTERFACE_OBJECT_CLASS: ThreadUnsafeOnceLock<NonCallbackInterfaceObjectClass> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_interface_object<D: DomTypes>() {{
INTERFACE_OBJECT_CLASS.set(NonCallbackInterfaceObjectClass::new(
Box::leak(Box::new({constructorBehavior})),
{representation},
PrototypeList::ID::{name},
{self.descriptor.prototypeDepth},
));
}}
"""
class CGList(CGThing):
"""
Generate code for a list of GCThings. Just concatenates them together, with
an optional joiner string. "\n" is a common joiner.
"""
def __init__(self, children, joiner=""):
CGThing.__init__(self)
# Make a copy of the kids into a list, because if someone passes in a
# generator we won't be able to both declare and define ourselves, or
# define ourselves more than once!
self.children = list(children)
self.joiner = joiner
def append(self, child):
self.children.append(child)
def prepend(self, child):
self.children.insert(0, child)
def join(self, iterable):
return self.joiner.join(s for s in iterable if len(s) > 0)
def define(self):
return self.join(child.define() for child in self.children if child is not None)
def __len__(self):
return len(self.children)
class CGIfElseWrapper(CGList):
def __init__(self, condition, ifTrue, ifFalse):
if ifFalse.text.strip().startswith("if"):
elseBranch = CGWrapper(ifFalse, pre=" else ")
else:
elseBranch = CGWrapper(CGIndenter(ifFalse), pre=" else {\n", post="\n}")
kids = [CGIfWrapper(condition, ifTrue), elseBranch]
CGList.__init__(self, kids)
class CGGeneric(CGThing):
"""
A class that spits out a fixed string into the codegen. Can spit out a
separate string for the declaration too.
"""
def __init__(self, text):
self.text = text
def define(self):
return self.text
class CGCallbackTempRoot(CGGeneric):
def __init__(self, name):
CGGeneric.__init__(self, f"{name.replace('<D>', '::<D>')}::new(cx, ${{val}}.get().to_object())")
def getAllTypes(descriptors, dictionaries, callbacks, typedefs):
"""
Generate all the types we're dealing with. For each type, a tuple
containing type, descriptor, dictionary is yielded. The
descriptor can be None if the type does not come from a descriptor.
"""
for d in descriptors:
for t in getTypesFromDescriptor(d):
yield (t, d)
for dictionary in dictionaries:
for t in getTypesFromDictionary(dictionary):
yield (t, None)
for callback in callbacks:
for t in getTypesFromCallback(callback):
yield (t, None)
for typedef in typedefs:
yield (typedef.innerType, None)
def UnionTypes(descriptors, dictionaries, callbacks, typedefs, config):
"""
Returns a CGList containing CGUnionStructs for every union.
"""
imports = [
'crate::import::base::*',
'crate::codegen::DomTypes::DomTypes',
'crate::conversions::windowproxy_from_handlevalue',
'crate::record::Record',
'js::typedarray',
]
# Now find all the things we'll need as arguments and return values because
# we need to wrap or unwrap them.
unionStructs = dict()
for (t, descriptor) in getAllTypes(descriptors, dictionaries, callbacks, typedefs):
t = t.unroll()
if not t.isUnion():
continue
for memberType in t.flatMemberTypes:
if memberType.isDictionary() or memberType.isEnum() or memberType.isCallback():
memberModule = getModuleFromObject(memberType)
memberName = (memberType.callback.identifier.name
if memberType.isCallback() else memberType.inner.identifier.name)
imports.append(f"{memberModule}::{memberName}")
if memberType.isEnum():
imports.append(f"{memberModule}::{memberName}Values")
name = str(t)
if name not in unionStructs:
provider = descriptor or config.getDescriptorProvider()
unionStructs[name] = CGList([
CGUnionStruct(t, provider, config),
CGUnionConversionStruct(t, provider)
])
# Sort unionStructs by key, retrieve value
unionStructs = (i[1] for i in sorted(list(unionStructs.items()), key=operator.itemgetter(0)))
return CGImports(CGList(unionStructs, "\n\n"), descriptors=[], callbacks=[], dictionaries=[], enums=[],
typedefs=[], imports=imports, config=config)
def DomTypes(descriptors, descriptorProvider, dictionaries, callbacks, typedefs, config):
traits = [
"crate::interfaces::DomHelpers<Self>",
"js::rust::Trace",
"malloc_size_of::MallocSizeOf",
"Sized",
]
joinedTraits = ' + '.join(traits)
elements = [CGGeneric(f"pub trait DomTypes: {joinedTraits} where Self: 'static {{\n")]
def fixupInterfaceTypeReferences(typename):
return typename.replace("D::", "Self::")
for descriptor in descriptors:
iface_name = descriptor.interface.identifier.name
traits = []
traits += descriptor.additionalTraits
chain = descriptor.prototypeChain
upcast = descriptor.hasDescendants()
if not upcast:
# No other interface will implement DeriveFrom<Foo> for this Foo, so avoid
# implementing it for itself.
chain = chain[:-1]
if chain:
traits += ["crate::inheritance::Castable"]
for parent in chain:
traits += [f"crate::conversions::DerivedFrom<Self::{parent}>"]
iterableDecl = descriptor.interface.maplikeOrSetlikeOrIterable
if iterableDecl:
if iterableDecl.isMaplike():
keytype = fixupInterfaceTypeReferences(
getRetvalDeclarationForType(iterableDecl.keyType, descriptor).define()
)
valuetype = fixupInterfaceTypeReferences(
getRetvalDeclarationForType(iterableDecl.valueType, descriptor).define()
)
traits += [f"crate::like::Maplike<Key={keytype}, Value={valuetype}>"]
if iterableDecl.isSetlike():
keytype = fixupInterfaceTypeReferences(
getRetvalDeclarationForType(iterableDecl.keyType, descriptor).define()
)
traits += [f"crate::like::Setlike<Key={keytype}>"]
if iterableDecl.hasKeyType():
traits += [
"crate::reflector::DomObjectIteratorWrap<Self>",
"crate::iterable::IteratorDerives",
]
if descriptor.weakReferenceable:
traits += ["crate::weakref::WeakReferenceable"]
if not descriptor.interface.isNamespace():
traits += [
"js::conversions::ToJSValConvertible",
"crate::reflector::MutDomObject",
"crate::reflector::DomObject",
"crate::reflector::DomGlobalGeneric<Self>",
"malloc_size_of::MallocSizeOf",
]
if descriptor.register:
if (
(descriptor.concrete or descriptor.hasDescendants())
and not descriptor.interface.isNamespace()
and not descriptor.interface.isIteratorInterface()
):
traits += [
"crate::conversions::IDLInterface",
"PartialEq",
]
if descriptor.concrete and not descriptor.isGlobal():
traits += ["crate::reflector::DomObjectWrap<Self>"]
if not descriptor.interface.isCallback() and not descriptor.interface.isIteratorInterface():
nonConstMembers = [m for m in descriptor.interface.members if not m.isConst()]
ctor = descriptor.interface.ctor()
if (
nonConstMembers
or (ctor and not ctor.isHTMLConstructor())
or descriptor.interface.legacyFactoryFunctions
):
namespace = f"{toBindingPath(descriptor)}"
traits += [f"crate::codegen::GenericBindings::{namespace}::{iface_name}Methods<Self>"]
isPromise = firstCap(iface_name) == "Promise"
elements += [
CGGeneric(" #[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]\n"),
CGGeneric(
" #[cfg_attr(crown, crown::unrooted_must_root_lint::allow_unrooted_in_rc)]\n"
if isPromise else ""
),
CGGeneric(f" type {firstCap(iface_name)}: {' + '.join(traits)};\n")
]
elements += [CGGeneric("}\n")]
imports = [
CGGeneric("use crate::root::DomRoot;\n"),
CGGeneric("use crate::str::DOMString;\n"),
]
return CGList(imports + elements)
def DomTypeHolder(descriptors, descriptorProvider, dictionaries, callbacks, typedefs, config):
elements = [
CGGeneric(
"#[derive(JSTraceable, MallocSizeOf, PartialEq)]\n"
"pub(crate) struct DomTypeHolder;\n"
"impl crate::DomTypes for DomTypeHolder {\n"
),
]
for descriptor in descriptors:
if descriptor.interface.isCallback() or descriptor.interface.isIteratorInterface():
continue
iface_name = descriptor.interface.identifier.name
path = f"crate::dom::{iface_name.lower()}::{firstCap(iface_name)}"
elements.append(CGGeneric(f" type {firstCap(iface_name)} = {path};\n"))
elements.append(CGGeneric("}\n"))
return CGList(elements)
class Argument():
"""
A class for outputting the type and name of an argument
"""
def __init__(self, argType, name, default=None, mutable=False):
self.argType = argType
self.name = name
self.default = default
self.mutable = mutable
def declare(self):
mut = 'mut ' if self.mutable else ''
argType = f': {self.argType}' if self.argType else ''
string = f"{mut}{self.name}{argType}"
# XXXjdm Support default arguments somehow :/
# if self.default is not None:
# string += " = " + self.default
return string
def define(self):
return f'{self.argType} {self.name}'
class CGAbstractMethod(CGThing):
"""
An abstract class for generating code for a method. Subclasses
should override definition_body to create the actual code.
descriptor is the descriptor for the interface the method is associated with
name is the name of the method as a string
returnType is the IDLType of the return value
args is a list of Argument objects
inline should be True to generate an inline method, whose body is
part of the declaration.
alwaysInline should be True to generate an inline method annotated with
MOZ_ALWAYS_INLINE.
If templateArgs is not None it should be a list of strings containing
template arguments, and the function will be templatized using those
arguments.
docs is None or documentation for the method in a string.
unsafe is used to add the decorator 'unsafe' to a function, giving as a result
an 'unsafe fn()' declaration.
"""
def __init__(self, descriptor, name, returnType, args, inline=False,
alwaysInline=False, extern=False, unsafe=False, pub=False,
templateArgs=None, docs=None, doesNotPanic=False, extra_decorators=[]):
CGThing.__init__(self)
self.descriptor = descriptor
self.name = name
self.returnType = returnType
self.args = args
self.alwaysInline = alwaysInline
self.extern = extern
self.unsafe = extern or unsafe
self.templateArgs = templateArgs
self.pub = pub
self.docs = docs
self.catchPanic = self.extern and not doesNotPanic
self.extra_decorators = extra_decorators
def _argstring(self):
return ', '.join([a.declare() for a in self.args])
def _template(self):
if self.templateArgs is None:
return ''
return f'<{", ".join(self.templateArgs)}>\n'
def _docs(self):
if self.docs is None:
return ''
lines = self.docs.splitlines()
return ''.join(f'/// {line}\n' for line in lines)
def _decorators(self):
decorators = []
if self.alwaysInline:
decorators.append('#[inline]')
decorators.extend(self.extra_decorators)
if self.pub:
decorators.append('pub')
if self.unsafe:
decorators.append('unsafe')
if self.extern:
decorators.append('extern "C"')
if not decorators:
return ''
return f'{" ".join(decorators)} '
def _returnType(self):
return f" -> {self.returnType}" if self.returnType != "void" else ""
def define(self):
body = self.definition_body()
if self.catchPanic:
if self.returnType == "void":
pre = "wrap_panic(&mut || {\n"
post = "\n})"
elif "return" not in body.define() or self.name.startswith("_constructor"):
pre = (
"let mut result = false;\n"
"wrap_panic(&mut || result = {\n"
)
post = (
"\n});\n"
"result"
)
else:
pre = (
"let mut result = false;\n"
"wrap_panic(&mut || result = (|| {\n"
)
post = (
"\n})());\n"
"result"
)
body = CGWrapper(CGIndenter(body), pre=pre, post=post)
return CGWrapper(CGIndenter(body),
pre=self.definition_prologue(),
post=self.definition_epilogue()).define()
def definition_prologue(self):
return (f"{self._docs()}{self._decorators()}"
f"fn {self.name}{self._template()}({self._argstring()}){self._returnType()}{{\n")
def definition_epilogue(self):
return "\n}\n"
def definition_body(self):
raise NotImplementedError # Override me!
class CGConstructorEnabled(CGAbstractMethod):
"""
A method for testing whether we should be exposing this interface object.
This can perform various tests depending on what conditions are specified
on the interface.
"""
def __init__(self, descriptor):
CGAbstractMethod.__init__(self, descriptor,
'ConstructorEnabled', 'bool',
[Argument("SafeJSContext", "aCx"),
Argument("HandleObject", "aObj")],
templateArgs=['D: DomTypes'])
def definition_body(self):
conditions = []
iface = self.descriptor.interface
bits = " | ".join(sorted(
f"Globals::{camel_to_upper_snake(i)}" for i in iface.exposureSet
))
conditions.append(f"is_exposed_in(aObj, {bits})")
pref = iface.getExtendedAttribute("Pref")
if pref:
assert isinstance(pref, list) and len(pref) == 1
conditions.append(f'pref!({pref[0]})')
func = iface.getExtendedAttribute("Func")
if func:
assert isinstance(func, list) and len(func) == 1
conditions.append(f"D::{func[0]}(aCx, aObj)")
secure = iface.getExtendedAttribute("SecureContext")
if secure:
conditions.append("""
unsafe {
let in_realm_proof = AlreadyInRealm::assert_for_cx(aCx);
D::GlobalScope::from_context(*aCx, InRealm::Already(&in_realm_proof)).is_secure_context()
}
""")
return CGList((CGGeneric(cond) for cond in conditions), " &&\n")
def InitLegacyUnforgeablePropertiesOnHolder(descriptor, properties):
"""
Define the unforgeable properties on the unforgeable holder for
the interface represented by descriptor.
properties is a PropertyArrays instance.
"""
unforgeables = []
defineLegacyUnforgeableAttrs = "define_guarded_properties::<D>(cx, unforgeable_holder.handle(), %s, global);"
defineLegacyUnforgeableMethods = "define_guarded_methods::<D>(cx, unforgeable_holder.handle(), %s, global);"
unforgeableMembers = [
(defineLegacyUnforgeableAttrs, properties.unforgeable_attrs),
(defineLegacyUnforgeableMethods, properties.unforgeable_methods),
]
for template, array in unforgeableMembers:
if array.length() > 0:
unforgeables.append(CGGeneric(template % f"unsafe {{ {array.variableName()}.get() }}"))
return CGList(unforgeables, "\n")
def CopyLegacyUnforgeablePropertiesToInstance(descriptor):
"""
Copy the unforgeable properties from the unforgeable holder for
this interface to the instance object we have.
"""
if not descriptor.hasLegacyUnforgeableMembers:
return ""
copyCode = ""
# For proxies, we want to define on the expando object, not directly on the
# reflector, so we can make sure we don't get confused by named getters.
if descriptor.proxy:
copyCode += """\
rooted!(in(*cx) let mut expando = ptr::null_mut::<JSObject>());
ensure_expando_object(*cx, obj.handle().into(), expando.handle_mut());
"""
obj = "expando"
else:
obj = "obj"
# We can't do the fast copy for globals, because we can't allocate the
# unforgeable holder for those with the right JSClass. Luckily, there
# aren't too many globals being created.
if descriptor.isGlobal():
copyFunc = "JS_CopyOwnPropertiesAndPrivateFields"
else:
copyFunc = "JS_InitializePropertiesFromCompatibleNativeObject"
copyCode += f"""
let mut slot = UndefinedValue();
JS_GetReservedSlot(canonical_proto.get(), DOM_PROTO_UNFORGEABLE_HOLDER_SLOT, &mut slot);
rooted!(in(*cx) let mut unforgeable_holder = ptr::null_mut::<JSObject>());
unforgeable_holder.handle_mut().set(slot.to_object());
assert!({copyFunc}(*cx, {obj}.handle(), unforgeable_holder.handle()));
"""
return copyCode
class CGWrapMethod(CGAbstractMethod):
"""
Class that generates the Foo_Binding::Wrap function for non-callback
interfaces.
"""
def __init__(self, descriptor):
assert not descriptor.interface.isCallback()
assert not descriptor.isGlobal()
args = [Argument('SafeJSContext', 'cx'),
Argument('&D::GlobalScope', 'scope'),
Argument('Option<HandleObject>', 'given_proto'),
Argument(f"Box<{descriptor.concreteType}>", 'object'),
Argument('CanGc', '_can_gc')]
retval = f'DomRoot<{descriptor.concreteType}>'
CGAbstractMethod.__init__(self, descriptor, 'Wrap', retval, args,
pub=True, unsafe=True,
extra_decorators=['#[cfg_attr(crown, allow(crown::unrooted_must_root))]'],
templateArgs=['D: DomTypes'])
def definition_body(self):
unforgeable = CopyLegacyUnforgeablePropertiesToInstance(self.descriptor)
if self.descriptor.proxy:
if self.descriptor.isMaybeCrossOriginObject():
proto = "ptr::null_mut()"
lazyProto = "true" # Our proxy handler will manage the prototype
else:
proto = "canonical_proto.get()"
lazyProto = "false"
create = f"""
let handler: *const libc::c_void =
RegisterBindings::proxy_handlers::{self.descriptor.interface.identifier.name}
.load(std::sync::atomic::Ordering::Acquire);
rooted!(in(*cx) let obj = NewProxyObject(
*cx,
handler,
Handle::from_raw(UndefinedHandleValue),
{proto},
ptr::null(),
{lazyProto},
));
assert!(!obj.is_null());
SetProxyReservedSlot(
obj.get(),
0,
&PrivateValue(raw.as_ptr() as *const libc::c_void),
);
"""
else:
create = """
rooted!(in(*cx) let mut proto = ptr::null_mut::<JSObject>());
if let Some(given) = given_proto {
proto.set(*given);
if get_context_realm(*cx) != get_object_realm(*given) {
assert!(JS_WrapObject(*cx, proto.handle_mut()));
}
} else {
proto.set(*canonical_proto);
}
rooted!(in(*cx) let obj = JS_NewObjectWithGivenProto(
*cx,
&Class.get().base,
proto.handle(),
));
assert!(!obj.is_null());
JS_SetReservedSlot(
obj.get(),
DOM_OBJECT_SLOT,
&PrivateValue(raw.as_ptr() as *const libc::c_void),
);
"""
if self.descriptor.weakReferenceable:
create += """
let val = PrivateValue(ptr::null());
JS_SetReservedSlot(obj.get(), DOM_WEAK_SLOT, &val);
"""
return CGGeneric(f"""
let raw = Root::new(MaybeUnreflectedDom::from_box(object));
let scope = scope.reflector().get_jsobject();
assert!(!scope.get().is_null());
assert!(((*get_object_class(scope.get())).flags & JSCLASS_IS_GLOBAL) != 0);
let _ac = JSAutoRealm::new(*cx, scope.get());
rooted!(in(*cx) let mut canonical_proto = ptr::null_mut::<JSObject>());
GetProtoObject::<D>(cx, scope, canonical_proto.handle_mut());
assert!(!canonical_proto.is_null());
{create}
let root = raw.reflect_with(obj.get());
{unforgeable}
DomRoot::from_ref(&*root)\
""")
class CGWrapGlobalMethod(CGAbstractMethod):
"""
Class that generates the Foo_Binding::Wrap function for global interfaces.
"""
def __init__(self, descriptor, properties):
assert not descriptor.interface.isCallback()
assert descriptor.isGlobal()
args = [Argument('SafeJSContext', 'cx'),
Argument(f"Box<{descriptor.concreteType}>", 'object')]
retval = f'DomRoot<{descriptor.concreteType}>'
CGAbstractMethod.__init__(self, descriptor, 'Wrap', retval, args,
pub=True, unsafe=True,
extra_decorators=['#[cfg_attr(crown, allow(crown::unrooted_must_root))]'],
templateArgs=['D: DomTypes'])
self.properties = properties
def definition_body(self):
pairs = [
("define_guarded_properties", self.properties.attrs),
("define_guarded_methods", self.properties.methods),
("define_guarded_constants", self.properties.consts)
]
members = [f"{function}::<D>(cx, obj.handle(), {array.variableName()}.get(), obj.handle());"
for (function, array) in pairs if array.length() > 0]
membersStr = "\n".join(members)
return CGGeneric(f"""
let raw = Root::new(MaybeUnreflectedDom::from_box(object));
let origin = (*raw.as_ptr()).upcast::<D::GlobalScope>().origin();
rooted!(in(*cx) let mut obj = ptr::null_mut::<JSObject>());
create_global_object::<D>(
cx,
&Class.get().base,
raw.as_ptr() as *const libc::c_void,
{TRACE_HOOK_NAME}::<D>,
obj.handle_mut(),
origin);
assert!(!obj.is_null());
let root = raw.reflect_with(obj.get());
let _ac = JSAutoRealm::new(*cx, obj.get());
rooted!(in(*cx) let mut canonical_proto = ptr::null_mut::<JSObject>());
GetProtoObject::<D>(cx, obj.handle(), canonical_proto.handle_mut());
assert!(JS_SetPrototype(*cx, obj.handle(), canonical_proto.handle()));
let mut immutable = false;
assert!(JS_SetImmutablePrototype(*cx, obj.handle(), &mut immutable));
assert!(immutable);
{membersStr}
{CopyLegacyUnforgeablePropertiesToInstance(self.descriptor)}
DomRoot::from_ref(&*root)\
""")
def toBindingPath(descriptor):
module = toBindingModuleFileFromDescriptor(descriptor)
namespace = toBindingNamespace(descriptor.interface.identifier.name)
return f"{module}::{namespace}"
class CGIDLInterface(CGThing):
"""
Class for codegen of an implementation of the IDLInterface trait.
"""
def __init__(self, descriptor):
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
interface = self.descriptor.interface
name = interface.identifier.name
bindingModule = f"crate::dom::bindings::codegen::GenericBindings::{toBindingPath(self.descriptor)}"
if (interface.getUserData("hasConcreteDescendant", False)
or interface.getUserData("hasProxyDescendant", False)):
depth = self.descriptor.prototypeDepth
check = f"class.interface_chain[{depth}] == PrototypeList::ID::{name}"
elif self.descriptor.proxy:
check = f"ptr::eq(class, unsafe {{ {bindingModule}::Class.get() }})"
else:
check = f"ptr::eq(class, unsafe {{ &{bindingModule}::Class.get().dom_class }})"
return f"""
impl IDLInterface for {name} {{
#[inline]
fn derives(class: &'static DOMClass) -> bool {{
{check}
}}
}}
"""
class CGIteratorDerives(CGThing):
"""
Class for codegen of an implementation of the IteratorDerives trait.
"""
def __init__(self, descriptor):
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
iterableInterface = self.descriptor.interface.iterableInterface
name = iterableInterface.identifier.name
bindingModule = f"crate::dom::bindings::codegen::Bindings::{toBindingPath(self.descriptor)}"
return f"""
impl crate::dom::bindings::iterable::IteratorDerives for {name} {{
#[inline]
fn derives(class: &'static DOMClass) -> bool {{
unsafe {{ ptr::eq(class, &{bindingModule}::Class.get().dom_class) }}
}}
}}
"""
class CGDomObjectWrap(CGThing):
"""
Class for codegen of an implementation of the DomObjectWrap trait.
"""
def __init__(self, descriptor):
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
ifaceName = self.descriptor.interface.identifier.name
bindingModule = f"crate::dom::bindings::codegen::GenericBindings::{toBindingPath(self.descriptor)}"
return f"""
impl DomObjectWrap<crate::DomTypeHolder> for {firstCap(ifaceName)} {{
const WRAP: unsafe fn(
SafeJSContext,
&GlobalScope,
Option<HandleObject>,
Box<Self>,
CanGc,
) -> Root<Dom<Self>> = {bindingModule}::Wrap::<crate::DomTypeHolder>;
}}
"""
class CGDomObjectIteratorWrap(CGThing):
"""
Class for codegen of an implementation of the DomObjectIteratorWrap trait.
"""
def __init__(self, descriptor):
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
assert self.descriptor.interface.isIteratorInterface()
name = self.descriptor.interface.iterableInterface.identifier.name
bindingModule = f"crate::dom::bindings::codegen::GenericBindings::{toBindingPath(self.descriptor)}"
return f"""
impl DomObjectIteratorWrap<crate::DomTypeHolder> for {name} {{
const ITER_WRAP: unsafe fn(
SafeJSContext,
&GlobalScope,
Option<HandleObject>,
Box<IterableIterator<crate::DomTypeHolder, Self>>,
CanGc,
) -> Root<Dom<IterableIterator<crate::DomTypeHolder, Self>>> = {bindingModule}::Wrap::<crate::DomTypeHolder>;
}}
"""
class CGAbstractExternMethod(CGAbstractMethod):
"""
Abstract base class for codegen of implementation-only (no
declaration) static methods.
"""
def __init__(self, descriptor, name, returnType, args, doesNotPanic=False, templateArgs=None):
CGAbstractMethod.__init__(self, descriptor, name, returnType, args,
inline=False, extern=True, doesNotPanic=doesNotPanic, templateArgs=templateArgs)
class PropertyArrays():
def __init__(self, descriptor):
self.static_methods = MethodDefiner(descriptor, "StaticMethods",
static=True, unforgeable=False)
self.static_attrs = AttrDefiner(descriptor, "StaticAttributes",
static=True, unforgeable=False)
self.methods = MethodDefiner(descriptor, "Methods", static=False, unforgeable=False)
self.unforgeable_methods = MethodDefiner(descriptor, "LegacyUnforgeableMethods",
static=False, unforgeable=True)
self.attrs = AttrDefiner(descriptor, "Attributes", static=False, unforgeable=False)
self.unforgeable_attrs = AttrDefiner(descriptor, "LegacyUnforgeableAttributes",
static=False, unforgeable=True)
self.consts = ConstDefiner(descriptor, "Constants")
pass
@staticmethod
def arrayNames():
return [
"static_methods",
"static_attrs",
"methods",
"unforgeable_methods",
"attrs",
"unforgeable_attrs",
"consts",
]
def variableNames(self):
names = {}
for array in self.arrayNames():
names[array] = getattr(self, array).variableName()
return names
def __str__(self):
define = ""
for array in self.arrayNames():
define += str(getattr(self, array))
return define
class CGCrossOriginProperties(CGThing):
def __init__(self, descriptor):
self.methods = MethodDefiner(descriptor, "CrossOriginMethods", static=False,
unforgeable=False, crossorigin=True)
self.attributes = AttrDefiner(descriptor, "CrossOriginAttributes", static=False,
unforgeable=False, crossorigin=True)
def define(self):
return f"{self.methods}{self.attributes}" + dedent(
"""
static CROSS_ORIGIN_PROPERTIES: ThreadUnsafeOnceLock<CrossOriginProperties> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_cross_origin_properties<D: DomTypes>() {
CROSS_ORIGIN_PROPERTIES.set(CrossOriginProperties {
attributes: unsafe { sCrossOriginAttributes.get() },
methods: unsafe { sCrossOriginMethods.get() },
});
}
"""
)
class CGCollectJSONAttributesMethod(CGAbstractMethod):
"""
Generate the CollectJSONAttributes method for an interface descriptor
"""
def __init__(self, descriptor, toJSONMethod):
args = [Argument('*mut JSContext', 'cx'),
Argument('RawHandleObject', 'obj'),
Argument('*mut libc::c_void', 'this'),
Argument('HandleObject', 'result')]
CGAbstractMethod.__init__(self, descriptor, 'CollectJSONAttributes',
'bool', args, pub=True, unsafe=True, templateArgs=["D: DomTypes"])
self.toJSONMethod = toJSONMethod
def definition_body(self):
ret = """let incumbent_global = D::GlobalScope::incumbent().expect("no incumbent global");
let global = incumbent_global.reflector().get_jsobject();\n"""
interface = self.descriptor.interface
for m in interface.members:
if m.isAttr() and not m.isStatic() and m.type.isJSONType():
name = m.identifier.name
conditions = MemberCondition(None, None, m.exposureSet, None)
ret_conditions = f'&[{", ".join(conditions)}]'
ret += fill(
"""
let conditions = ${conditions};
let is_satisfied = conditions.iter().any(|c|
c.is_satisfied::<D>(
SafeJSContext::from_ptr(cx),
HandleObject::from_raw(obj),
global));
if is_satisfied {
rooted!(in(cx) let mut temp = UndefinedValue());
if !get_${name}::<D>(cx, obj, this, JSJitGetterCallArgs { _base: temp.handle_mut().into() }) {
return false;
}
if !JS_DefineProperty(cx, result,
${nameAsArray},
temp.handle(), JSPROP_ENUMERATE as u32) {
return false;
}
}
""",
name=name, nameAsArray=str_to_cstr_ptr(name), conditions=ret_conditions)
ret += 'true\n'
return CGGeneric(ret)
class CGCreateInterfaceObjectsMethod(CGAbstractMethod):
"""
Generate the CreateInterfaceObjects method for an interface descriptor.
properties should be a PropertyArrays instance.
"""
def __init__(self, descriptor, properties, haveUnscopables, haveLegacyWindowAliases):
args = [Argument('SafeJSContext', 'cx'), Argument('HandleObject', 'global'),
Argument('*mut ProtoOrIfaceArray', 'cache')]
CGAbstractMethod.__init__(self, descriptor, 'CreateInterfaceObjects', 'void', args,
unsafe=True, templateArgs=['D: DomTypes'])
self.properties = properties
self.haveUnscopables = haveUnscopables
self.haveLegacyWindowAliases = haveLegacyWindowAliases
def definition_body(self):
name = self.descriptor.interface.identifier.name
if self.descriptor.interface.isNamespace():
if self.descriptor.interface.getExtendedAttribute("ProtoObjectHack"):
proto = "GetRealmObjectPrototype(*cx)"
else:
proto = "JS_NewPlainObject(*cx)"
if self.properties.static_methods.length():
methods = f"{self.properties.static_methods.variableName()}.get()"
else:
methods = "&[]"
if self.descriptor.interface.hasConstants():
constants = "sConstants.get()"
else:
constants = "&[]"
id = MakeNativeName(name)
return CGGeneric(f"""
rooted!(in(*cx) let proto = {proto});
assert!(!proto.is_null());
rooted!(in(*cx) let mut namespace = ptr::null_mut::<JSObject>());
create_namespace_object::<D>(cx, global, proto.handle(), &NAMESPACE_OBJECT_CLASS,
{methods}, {constants}, {str_to_cstr(name)}, namespace.handle_mut());
assert!(!namespace.is_null());
assert!((*cache)[PrototypeList::Constructor::{id} as usize].is_null());
(*cache)[PrototypeList::Constructor::{id} as usize] = namespace.get();
<*mut JSObject>::post_barrier((*cache).as_mut_ptr().offset(PrototypeList::Constructor::{id} as isize),
ptr::null_mut(),
namespace.get());
""")
if self.descriptor.interface.isCallback():
assert not self.descriptor.interface.ctor() and self.descriptor.interface.hasConstants()
cName = str_to_cstr(name)
return CGGeneric(f"""
rooted!(in(*cx) let mut interface = ptr::null_mut::<JSObject>());
create_callback_interface_object::<D>(cx, global, sConstants.get(), {cName}, interface.handle_mut());
assert!(!interface.is_null());
assert!((*cache)[PrototypeList::Constructor::{name} as usize].is_null());
(*cache)[PrototypeList::Constructor::{name} as usize] = interface.get();
<*mut JSObject>::post_barrier((*cache).as_mut_ptr().offset(PrototypeList::Constructor::{name} as isize),
ptr::null_mut(),
interface.get());
""")
parentName = self.descriptor.getParentName()
if not parentName:
if self.descriptor.interface.getExtendedAttribute("ExceptionClass"):
protoGetter = "GetRealmErrorPrototype"
elif self.descriptor.interface.isIteratorInterface():
protoGetter = "GetRealmIteratorPrototype"
else:
protoGetter = "GetRealmObjectPrototype"
getPrototypeProto = f"prototype_proto.set({protoGetter}(*cx))"
else:
getPrototypeProto = (
f"{toBindingNamespace(parentName)}::GetProtoObject::<D>(cx, global, prototype_proto.handle_mut())"
)
code = [CGGeneric(f"""
rooted!(in(*cx) let mut prototype_proto = ptr::null_mut::<JSObject>());
{getPrototypeProto};
assert!(!prototype_proto.is_null());""")]
if self.descriptor.hasNamedPropertiesObject():
assert not self.haveUnscopables
code.append(CGGeneric(f"""
rooted!(in(*cx) let mut prototype_proto_proto = prototype_proto.get());
D::{name}::create_named_properties_object(cx, prototype_proto_proto.handle(), prototype_proto.handle_mut());
assert!(!prototype_proto.is_null());"""))
properties = {
"id": name,
"unscopables": "unscopable_names" if self.haveUnscopables else "&[]",
"legacyWindowAliases": "legacy_window_aliases" if self.haveLegacyWindowAliases else "&[]"
}
for arrayName in self.properties.arrayNames():
array = getattr(self.properties, arrayName)
if array.length():
properties[arrayName] = f"{array.variableName()}.get()"
else:
properties[arrayName] = "&[]"
if self.descriptor.isGlobal():
assert not self.haveUnscopables
proto_properties = {
"attrs": "&[]",
"consts": "&[]",
"id": name,
"methods": "&[]",
"unscopables": "&[]",
}
else:
proto_properties = properties
code.append(CGGeneric(f"""
rooted!(in(*cx) let mut prototype = ptr::null_mut::<JSObject>());
create_interface_prototype_object::<D>(cx,
global,
prototype_proto.handle(),
&PrototypeClass,
{proto_properties['methods']},
{proto_properties['attrs']},
{proto_properties['consts']},
{proto_properties['unscopables']},
prototype.handle_mut());
assert!(!prototype.is_null());
assert!((*cache)[PrototypeList::ID::{proto_properties['id']} as usize].is_null());
(*cache)[PrototypeList::ID::{proto_properties['id']} as usize] = prototype.get();
<*mut JSObject>::post_barrier((*cache).as_mut_ptr().offset(PrototypeList::ID::{proto_properties['id']} as isize),
ptr::null_mut(),
prototype.get());
"""))
if self.descriptor.interface.hasInterfaceObject():
properties["name"] = str_to_cstr(name)
if self.descriptor.interface.ctor():
properties["length"] = methodLength(self.descriptor.interface.ctor())
else:
properties["length"] = 0
parentName = self.descriptor.getParentName()
code.append(CGGeneric("rooted!(in(*cx) let mut interface_proto = ptr::null_mut::<JSObject>());"))
if parentName:
parentName = toBindingNamespace(parentName)
code.append(CGGeneric(f"""
{parentName}::GetConstructorObject::<D>(cx, global, interface_proto.handle_mut());"""))
else:
code.append(CGGeneric("interface_proto.set(GetRealmFunctionPrototype(*cx));"))
code.append(CGGeneric(f"""
assert!(!interface_proto.is_null());
rooted!(in(*cx) let mut interface = ptr::null_mut::<JSObject>());
create_noncallback_interface_object::<D>(cx,
global,
interface_proto.handle(),
INTERFACE_OBJECT_CLASS.get(),
{properties['static_methods']},
{properties['static_attrs']},
{properties['consts']},
prototype.handle(),
{properties['name']},
{properties['length']},
{properties['legacyWindowAliases']},
interface.handle_mut());
assert!(!interface.is_null());"""))
if self.descriptor.shouldCacheConstructor():
code.append(CGGeneric(f"""
assert!((*cache)[PrototypeList::Constructor::{properties['id']} as usize].is_null());
(*cache)[PrototypeList::Constructor::{properties['id']} as usize] = interface.get();
<*mut JSObject>::post_barrier((*cache).as_mut_ptr().offset(PrototypeList::Constructor::{properties['id']} as isize),
ptr::null_mut(),
interface.get());
"""))
aliasedMembers = [m for m in self.descriptor.interface.members if m.isMethod() and m.aliases]
if aliasedMembers:
def defineAlias(alias):
if alias == "@@iterator":
symbolJSID = "RUST_SYMBOL_TO_JSID(GetWellKnownSymbol(*cx, SymbolCode::iterator), \
iteratorId.handle_mut())"
getSymbolJSID = CGGeneric(fill("rooted!(in(*cx) let mut iteratorId: jsid);\n${symbolJSID};\n",
symbolJSID=symbolJSID))
defineFn = "JS_DefinePropertyById2"
prop = "iteratorId.handle()"
enumFlags = "0" # Not enumerable, per spec.
elif alias.startswith("@@"):
raise TypeError("Can't handle any well-known Symbol other than @@iterator")
else:
getSymbolJSID = None
defineFn = "JS_DefineProperty"
prop = f'"{alias}"'
enumFlags = "JSPROP_ENUMERATE"
if enumFlags != "0":
enumFlags = f"{enumFlags} as u32"
return CGList([
getSymbolJSID,
# XXX If we ever create non-enumerable properties that can
# be aliased, we should consider making the aliases
# match the enumerability of the property being aliased.
CGGeneric(fill(
"""
assert!(${defineFn}(*cx, prototype.handle(), ${prop}, aliasedVal.handle(), ${enumFlags}));
""",
defineFn=defineFn,
prop=prop,
enumFlags=enumFlags))
], "\n")
def defineAliasesFor(m):
return CGList([
CGGeneric(fill(
"""
assert!(JS_GetProperty(*cx, prototype.handle(),
${prop} as *const u8 as *const _,
aliasedVal.handle_mut()));
""",
prop=str_to_cstr_ptr(m.identifier.name)))
] + [defineAlias(alias) for alias in sorted(m.aliases)])
defineAliases = CGList([
CGGeneric(fill("""
// Set up aliases on the interface prototype object we just created.
""")),
CGGeneric("rooted!(in(*cx) let mut aliasedVal = UndefinedValue());\n\n")
] + [defineAliasesFor(m) for m in sorted(aliasedMembers)])
code.append(defineAliases)
constructors = self.descriptor.interface.legacyFactoryFunctions
if constructors:
decl = f"let named_constructors: [(ConstructorClassHook, &std::ffi::CStr, u32); {len(constructors)}]"
specs = []
for constructor in constructors:
hook = f"{CONSTRUCT_HOOK_NAME}_{constructor.identifier.name}"
name = str_to_cstr(constructor.identifier.name)
length = methodLength(constructor)
specs.append(CGGeneric(f"({hook}::<D> as ConstructorClassHook, {name}, {length})"))
values = CGIndenter(CGList(specs, "\n"), 4)
code.append(CGWrapper(values, pre=f"{decl} = [\n", post="\n];"))
code.append(CGGeneric("create_named_constructors(cx, global, &named_constructors, prototype.handle());"))
if self.descriptor.hasLegacyUnforgeableMembers:
# We want to use the same JSClass and prototype as the object we'll
# end up defining the unforgeable properties on in the end, so that
# we can use JS_InitializePropertiesFromCompatibleNativeObject to do
# a fast copy. In the case of proxies that's null, because the
# expando object is a vanilla object, but in the case of other DOM
# objects it's whatever our class is.
#
# Also, for a global we can't use the global's class; just use
# nullpr and when we do the copy off the holder we'll take a slower
# path. This also means that we don't need to worry about matching
# the prototype.
if self.descriptor.proxy or self.descriptor.isGlobal():
holderClass = "ptr::null()"
holderProto = "HandleObject::null()"
else:
holderClass = "&Class.get().base as *const JSClass"
holderProto = "prototype.handle()"
code.append(CGGeneric(f"""
rooted!(in(*cx) let mut unforgeable_holder = ptr::null_mut::<JSObject>());
unforgeable_holder.handle_mut().set(
JS_NewObjectWithoutMetadata(*cx, {holderClass}, {holderProto}));
assert!(!unforgeable_holder.is_null());
"""))
code.append(InitLegacyUnforgeablePropertiesOnHolder(self.descriptor, self.properties))
code.append(CGGeneric("""\
let val = ObjectValue(unforgeable_holder.get());
JS_SetReservedSlot(prototype.get(), DOM_PROTO_UNFORGEABLE_HOLDER_SLOT, &val)"""))
return CGList(code, "\n")
class CGGetPerInterfaceObject(CGAbstractMethod):
"""
A method for getting a per-interface object (a prototype object or interface
constructor object).
"""
def __init__(self, descriptor, name, idPrefix="", pub=False):
args = [Argument('SafeJSContext', 'cx'),
Argument('HandleObject', 'global'),
Argument('MutableHandleObject', 'mut rval')]
CGAbstractMethod.__init__(self, descriptor, name,
'void', args, pub=pub, templateArgs=['D: DomTypes'])
self.id = f"{idPrefix}::{MakeNativeName(self.descriptor.name)}"
self.variant = self.id.split('::')[-2]
def definition_body(self):
return CGGeneric(
"get_per_interface_object_handle"
f"(cx, global, ProtoOrIfaceIndex::{self.variant}({self.id}), CreateInterfaceObjects::<D>, rval)"
)
class CGGetProtoObjectMethod(CGGetPerInterfaceObject):
"""
A method for getting the interface prototype object.
"""
def __init__(self, descriptor):
CGGetPerInterfaceObject.__init__(self, descriptor, "GetProtoObject",
"PrototypeList::ID", pub=True)
def definition_body(self):
return CGList([
CGGeneric("""\
/* Get the interface prototype object for this class. This will create the
object as needed. */"""),
CGGetPerInterfaceObject.definition_body(self),
])
class CGGetConstructorObjectMethod(CGGetPerInterfaceObject):
"""
A method for getting the interface constructor object.
"""
def __init__(self, descriptor):
CGGetPerInterfaceObject.__init__(self, descriptor, "GetConstructorObject",
"PrototypeList::Constructor",
pub=True)
def definition_body(self):
return CGList([
CGGeneric("""\
/* Get the interface object for this class. This will create the object as
needed. */"""),
CGGetPerInterfaceObject.definition_body(self),
])
class CGDefineProxyHandler(CGAbstractMethod):
"""
A method to create and cache the proxy trap for a given interface.
"""
def __init__(self, descriptor):
assert descriptor.proxy
CGAbstractMethod.__init__(self, descriptor, 'DefineProxyHandler',
'*const libc::c_void', [],
pub=True, unsafe=True, templateArgs=["D: DomTypes"])
def define(self):
return CGAbstractMethod.define(self)
def definition_body(self):
customDefineProperty = 'proxyhandler::define_property'
if self.descriptor.isMaybeCrossOriginObject() or self.descriptor.operations['IndexedSetter'] or \
self.descriptor.operations['NamedSetter']:
customDefineProperty = 'defineProperty::<D>'
customDelete = 'proxyhandler::delete'
if self.descriptor.isMaybeCrossOriginObject() or self.descriptor.operations['NamedDeleter']:
customDelete = 'delete::<D>'
customGetPrototypeIfOrdinary = 'Some(proxyhandler::get_prototype_if_ordinary)'
customGetPrototype = 'None'
customSetPrototype = 'None'
if self.descriptor.isMaybeCrossOriginObject():
customGetPrototypeIfOrdinary = 'Some(proxyhandler::maybe_cross_origin_get_prototype_if_ordinary_rawcx)'
customGetPrototype = 'Some(getPrototype::<D>)'
customSetPrototype = 'Some(proxyhandler::maybe_cross_origin_set_prototype_rawcx)'
# The base class `BaseProxyHandler`'s `setImmutablePrototype` (not to be
# confused with ECMAScript's `[[SetImmutablePrototype]]`) always fails.
# This is the desired behavior, so we don't override it.
customSet = 'None'
if self.descriptor.isMaybeCrossOriginObject():
# `maybe_cross_origin_set_rawcx` doesn't support legacy platform objects'
# `[[Set]]` (https://heycam.github.io/webidl/#legacy-platform-object-set) (yet).
assert not self.descriptor.operations['IndexedGetter']
assert not self.descriptor.operations['NamedGetter']
customSet = 'Some(proxyhandler::maybe_cross_origin_set_rawcx::<D>)'
getOwnEnumerablePropertyKeys = "own_property_keys::<D>"
if self.descriptor.interface.getExtendedAttribute("LegacyUnenumerableNamedProperties") or \
self.descriptor.isMaybeCrossOriginObject():
getOwnEnumerablePropertyKeys = "getOwnEnumerablePropertyKeys::<D>"
return CGGeneric(f"""
init_proxy_handler_dom_class::<D>();
let traps = ProxyTraps {{
enter: None,
getOwnPropertyDescriptor: Some(getOwnPropertyDescriptor::<D>),
defineProperty: Some({customDefineProperty}),
ownPropertyKeys: Some(own_property_keys::<D>),
delete_: Some({customDelete}),
enumerate: None,
getPrototypeIfOrdinary: {customGetPrototypeIfOrdinary},
getPrototype: {customGetPrototype},
setPrototype: {customSetPrototype},
setImmutablePrototype: None,
preventExtensions: Some(proxyhandler::prevent_extensions),
isExtensible: Some(proxyhandler::is_extensible),
has: None,
get: Some(get::<D>),
set: {customSet},
call: None,
construct: None,
hasOwn: Some(hasOwn::<D>),
getOwnEnumerablePropertyKeys: Some({getOwnEnumerablePropertyKeys}),
nativeCall: None,
objectClassIs: None,
className: Some(className),
fun_toString: None,
boxedValue_unbox: None,
defaultValue: None,
trace: Some({TRACE_HOOK_NAME}::<D>),
finalize: Some({FINALIZE_HOOK_NAME}::<D>),
objectMoved: None,
isCallable: None,
isConstructor: None,
}};
CreateProxyHandler(&traps, unsafe {{ Class.get() }}.as_void_ptr())\
""")
class CGDefineDOMInterfaceMethod(CGAbstractMethod):
"""
A method for resolve hooks to try to lazily define the interface object for
a given interface.
"""
def __init__(self, descriptor):
assert descriptor.interface.hasInterfaceObject()
args = [
Argument('SafeJSContext', 'cx'),
Argument('HandleObject', 'global'),
]
CGAbstractMethod.__init__(self, descriptor, 'DefineDOMInterface',
'void', args, pub=True, templateArgs=['D: DomTypes'])
if self.descriptor.interface.isCallback() or self.descriptor.interface.isNamespace():
idPrefix = "PrototypeList::Constructor"
else:
idPrefix = "PrototypeList::ID"
self.id = f"{idPrefix}::{MakeNativeName(self.descriptor.name)}"
self.variant = self.id.split('::')[-2]
def define(self):
return CGAbstractMethod.define(self)
def definition_body(self):
return CGGeneric(
"define_dom_interface"
f"(cx, global, ProtoOrIfaceIndex::{self.variant}({self.id}),"
"CreateInterfaceObjects::<D>, ConstructorEnabled::<D>)"
)
def needCx(returnType, arguments, considerTypes):
return (considerTypes
and (typeNeedsCx(returnType, True)
or any(typeNeedsCx(a.type) for a in arguments)))
class CGCallGenerator(CGThing):
"""
A class to generate an actual call to a C++ object. Assumes that the C++
object is stored in a variable whose name is given by the |object| argument.
errorResult should be a string for the value to return in case of an
exception from the native code, or None if no error reporting is needed.
"""
def __init__(self, errorResult, arguments, argsPre, returnType,
extendedAttributes, descriptor, nativeMethodName,
static, object="this", hasCEReactions=False):
CGThing.__init__(self)
assert errorResult is None or isinstance(errorResult, str)
isFallible = errorResult is not None
result = getRetvalDeclarationForType(returnType, descriptor)
if returnType and returnTypeNeedsOutparam(returnType):
rootType = result
result = CGGeneric("()")
else:
rootType = None
if isFallible:
result = CGWrapper(result, pre="Result<", post=", Error>")
args = CGList([CGGeneric(arg) for arg in argsPre], ", ")
for (a, name) in arguments:
# XXXjdm Perhaps we should pass all nontrivial types by borrowed pointer
if a.type.isDictionary() and not type_needs_tracing(a.type):
name = f"&{name}"
args.append(CGGeneric(name))
needsCx = needCx(returnType, (a for (a, _) in arguments), True)
if "cx" not in argsPre and needsCx:
args.prepend(CGGeneric("cx"))
if nativeMethodName in descriptor.inRealmMethods:
args.append(CGGeneric("InRealm::already(&AlreadyInRealm::assert_for_cx(cx))"))
if nativeMethodName in descriptor.canGcMethods:
args.append(CGGeneric("CanGc::note()"))
if rootType:
args.append(CGGeneric("retval.handle_mut()"))
# Build up our actual call
self.cgRoot = CGList([], "\n")
if rootType:
self.cgRoot.append(CGList([
CGGeneric("rooted!(in(*cx) let mut retval: "),
rootType,
CGGeneric(");"),
]))
call = CGGeneric(nativeMethodName)
if static:
call = CGWrapper(call, pre=f"<D::{MakeNativeName(descriptor.interface.identifier.name)}>::")
else:
call = CGWrapper(call, pre=f"{object}.")
call = CGList([call, CGWrapper(args, pre="(", post=")")])
if hasCEReactions:
self.cgRoot.append(CGGeneric("<D as DomHelpers<D>>::push_new_element_queue();\n"))
self.cgRoot.append(CGList([
CGGeneric("let result: "),
result,
CGGeneric(" = "),
call,
CGGeneric(";"),
]))
if hasCEReactions:
self.cgRoot.append(CGGeneric("<D as DomHelpers<D>>::pop_current_element_queue(CanGc::note());\n"))
if isFallible:
if static:
glob = "global.upcast::<D::GlobalScope>()"
else:
glob = "&this.global_(InRealm::already(&AlreadyInRealm::assert_for_cx(cx)))"
self.cgRoot.append(CGGeneric(
"let result = match result {\n"
" Ok(result) => result,\n"
" Err(e) => {\n"
f" <D as DomHelpers<D>>::throw_dom_exception(cx, {glob}, e, CanGc::note());\n"
f" return{errorResult};\n"
" },\n"
"};"))
def define(self):
return self.cgRoot.define()
class CGPerSignatureCall(CGThing):
"""
This class handles the guts of generating code for a particular
call signature. A call signature consists of four things:
1) A return type, which can be None to indicate that there is no
actual return value (e.g. this is an attribute setter) or an
IDLType if there's an IDL type involved (including |void|).
2) An argument list, which is allowed to be empty.
3) A name of a native method to call.
4) Whether or not this method is static.
We also need to know whether this is a method or a getter/setter
to do error reporting correctly.
The idlNode parameter can be either a method or an attr. We can query
|idlNode.identifier| in both cases, so we can be agnostic between the two.
"""
# XXXbz For now each entry in the argument list is either an
# IDLArgument or a FakeArgument, but longer-term we may want to
# have ways of flagging things like JSContext* or optional_argc in
# there.
def __init__(self, returnType, argsPre, arguments, nativeMethodName, static,
descriptor, idlNode, argConversionStartsAt=0,
getter=False, setter=False):
CGThing.__init__(self)
self.returnType = returnType
self.descriptor = descriptor
self.idlNode = idlNode
self.extendedAttributes = descriptor.getExtendedAttributes(idlNode,
getter=getter,
setter=setter)
self.argsPre = argsPre
self.arguments = arguments
self.argCount = len(arguments)
cgThings = []
cgThings.extend([CGArgumentConverter(arguments[i], i, self.getArgs(),
self.getArgc(), self.descriptor,
invalidEnumValueFatal=not setter) for
i in range(argConversionStartsAt, self.argCount)])
errorResult = None
if self.isFallible():
errorResult = " false"
if idlNode.isMethod() and idlNode.isMaplikeOrSetlikeOrIterableMethod():
if idlNode.maplikeOrSetlikeOrIterable.isMaplike() or \
idlNode.maplikeOrSetlikeOrIterable.isSetlike():
cgThings.append(CGMaplikeOrSetlikeMethodGenerator(descriptor,
idlNode.maplikeOrSetlikeOrIterable,
idlNode.identifier.name))
else:
cgThings.append(CGIterableMethodGenerator(descriptor,
idlNode.maplikeOrSetlikeOrIterable,
idlNode.identifier.name))
else:
hasCEReactions = idlNode.getExtendedAttribute("CEReactions")
cgThings.append(CGCallGenerator(
errorResult,
self.getArguments(), self.argsPre, returnType,
self.extendedAttributes, descriptor, nativeMethodName,
static, hasCEReactions=hasCEReactions))
self.cgRoot = CGList(cgThings, "\n")
def getArgs(self):
return "args" if self.argCount > 0 else ""
def getArgc(self):
return "argc"
def getArguments(self):
return [(a, process_arg(f"arg{i}", a)) for (i, a) in enumerate(self.arguments)]
def isFallible(self):
return 'infallible' not in self.extendedAttributes
def wrap_return_value(self):
resultName = "result"
# Maplike methods have `any` return values in WebIDL, but our internal bindings
# use stronger types so we need to exclude them from being handled like other
# generated code.
if returnTypeNeedsOutparam(self.returnType) and (
not (self.idlNode.isMethod() and self.idlNode.isMaplikeOrSetlikeOrIterableMethod())):
resultName = "retval"
return wrapForType(
'MutableHandleValue::from_raw(args.rval())',
result=resultName,
successCode='return true;',
)
def define(self):
return f"{self.cgRoot.define()}\n{self.wrap_return_value()}"
class CGSwitch(CGList):
"""
A class to generate code for a switch statement.
Takes three constructor arguments: an expression, a list of cases,
and an optional default.
Each case is a CGCase. The default is a CGThing for the body of
the default case, if any.
"""
def __init__(self, expression, cases, default=None):
CGList.__init__(self, [CGIndenter(c) for c in cases], "\n")
self.prepend(CGWrapper(CGGeneric(expression),
pre="match ", post=" {"))
if default is not None:
self.append(
CGIndenter(
CGWrapper(
CGIndenter(default),
pre="_ => {\n",
post="\n}"
)
)
)
self.append(CGGeneric("}"))
class CGCase(CGList):
"""
A class to generate code for a case statement.
Takes three constructor arguments: an expression, a CGThing for
the body (allowed to be None if there is no body), and an optional
argument (defaulting to False) for whether to fall through.
"""
def __init__(self, expression, body, fallThrough=False):
CGList.__init__(self, [], "\n")
self.append(CGWrapper(CGGeneric(expression), post=" => {"))
bodyList = CGList([body], "\n")
if fallThrough:
raise TypeError("fall through required but unsupported")
# bodyList.append(CGGeneric('panic!("fall through unsupported"); /* Fall through */'))
self.append(CGIndenter(bodyList))
self.append(CGGeneric("}"))
class CGGetterCall(CGPerSignatureCall):
"""
A class to generate a native object getter call for a particular IDL
getter.
"""
def __init__(self, argsPre, returnType, nativeMethodName, descriptor, attr):
CGPerSignatureCall.__init__(self, returnType, argsPre, [],
nativeMethodName, attr.isStatic(), descriptor,
attr, getter=True)
class FakeArgument():
"""
A class that quacks like an IDLArgument. This is used to make
setters look like method calls or for special operations.
"""
def __init__(self, type, interfaceMember, allowTreatNonObjectAsNull=False):
self.type = type
self.optional = False
self.variadic = False
self.defaultValue = None
self._allowTreatNonObjectAsNull = allowTreatNonObjectAsNull
def allowTreatNonCallableAsNull(self):
return self._allowTreatNonObjectAsNull
class CGSetterCall(CGPerSignatureCall):
"""
A class to generate a native object setter call for a particular IDL
setter.
"""
def __init__(self, argsPre, argType, nativeMethodName, descriptor, attr):
CGPerSignatureCall.__init__(self, None, argsPre,
[FakeArgument(argType, attr, allowTreatNonObjectAsNull=True)],
nativeMethodName, attr.isStatic(), descriptor, attr,
setter=True)
def wrap_return_value(self):
# We have no return value
return "\ntrue"
def getArgc(self):
return "1"
class CGAbstractStaticBindingMethod(CGAbstractMethod):
"""
Common class to generate the JSNatives for all our static methods, getters
and setters. This will generate the function declaration and unwrap the
global object. Subclasses are expected to override the generate_code
function to do the rest of the work. This function should return a
CGThing which is already properly indented.
"""
def __init__(self, descriptor, name, templateArgs=None):
args = [
Argument('*mut JSContext', 'cx'),
Argument('libc::c_uint', 'argc'),
Argument('*mut JSVal', 'vp'),
]
CGAbstractMethod.__init__(self, descriptor, name, "bool", args, extern=True, templateArgs=templateArgs)
self.exposureSet = descriptor.interface.exposureSet
def definition_body(self):
preamble = """\
let args = CallArgs::from_vp(vp, argc);
let global = D::GlobalScope::from_object(args.callee());
"""
if len(self.exposureSet) == 1:
preamble += f"let global = DomRoot::downcast::<D::{list(self.exposureSet)[0]}>(global).unwrap();\n"
return CGList([CGGeneric(preamble), self.generate_code()])
def generate_code(self):
raise NotImplementedError # Override me!
def GetConstructorNameForReporting(descriptor, ctor):
# Figure out the name of our constructor for reporting purposes.
# For unnamed webidl constructors, identifier.name is "constructor" but
# the name JS sees is the interface name; for legacy factory functions
# identifier.name is the actual name.
ctorName = ctor.identifier.name
if ctorName == "constructor":
return descriptor.interface.identifier.name
return ctorName
class CGSpecializedMethod(CGAbstractExternMethod):
"""
A class for generating the C++ code for a specialized method that the JIT
can call with lower overhead.
"""
def __init__(self, descriptor, method):
self.method = method
name = method.identifier.name
args = [Argument('*mut JSContext', 'cx'),
Argument('RawHandleObject', '_obj'),
Argument('*mut libc::c_void', 'this'),
Argument('*const JSJitMethodCallArgs', 'args')]
CGAbstractExternMethod.__init__(self, descriptor, name, 'bool', args, templateArgs=["D: DomTypes"])
def definition_body(self):
nativeName = CGSpecializedMethod.makeNativeName(self.descriptor,
self.method)
return CGWrapper(CGMethodCall([], nativeName, self.method.isStatic(),
self.descriptor, self.method),
pre="let cx = SafeJSContext::from_ptr(cx);\n"
f"let this = &*(this as *const {self.descriptor.concreteType});\n"
"let args = &*args;\n"
"let argc = args.argc_;\n")
@staticmethod
def makeNativeName(descriptor, method):
if method.underlyingAttr:
return CGSpecializedGetter.makeNativeName(descriptor, method.underlyingAttr)
name = method.identifier.name
nativeName = descriptor.binaryNameFor(name)
if nativeName == name:
nativeName = descriptor.internalNameFor(name)
return MakeNativeName(nativeName)
# https://searchfox.org/mozilla-central/rev/b220e40ff2ee3d10ce68e07d8a8a577d5558e2a2/dom/bindings/Codegen.py#10655-10684
class CGMethodPromiseWrapper(CGAbstractExternMethod):
"""
A class for generating a wrapper around another method that will
convert exceptions to promises.
"""
def __init__(self, descriptor, methodToWrap):
self.method = methodToWrap
name = CGMethodPromiseWrapper.makeNativeName(descriptor, self.method)
args = [Argument('*mut JSContext', 'cx'),
Argument('RawHandleObject', '_obj'),
Argument('*mut libc::c_void', 'this'),
Argument('*const JSJitMethodCallArgs', 'args')]
CGAbstractExternMethod.__init__(self, descriptor, name, 'bool', args, templateArgs=["D: DomTypes"])
def definition_body(self):
return CGGeneric(fill(
"""
let ok = ${methodName}::<D>(${args});
if ok {
return true;
}
return exception_to_promise(cx, (*args).rval(), CanGc::note());
""",
methodName=self.method.identifier.name,
args=", ".join(arg.name for arg in self.args),
))
@staticmethod
def makeNativeName(descriptor, m):
return f"{m.identifier.name}_promise_wrapper"
# https://searchfox.org/mozilla-central/rev/7279a1df13a819be254fd4649e07c4ff93e4bd45/dom/bindings/Codegen.py#11390-11419
class CGGetterPromiseWrapper(CGAbstractExternMethod):
"""
A class for generating a wrapper around another getter that will
convert exceptions to promises.
"""
def __init__(self, descriptor, methodToWrap):
self.method = methodToWrap
name = CGGetterPromiseWrapper.makeNativeName(descriptor, self.method)
self.method_call = CGGetterPromiseWrapper.makeOrigName(descriptor, self.method)
args = [Argument('*mut JSContext', 'cx'),
Argument('RawHandleObject', '_obj'),
Argument('*mut libc::c_void', 'this'),
Argument('JSJitGetterCallArgs', 'args')]
CGAbstractExternMethod.__init__(self, descriptor, name, 'bool', args, templateArgs=["D: DomTypes"])
def definition_body(self):
return CGGeneric(fill(
"""
let ok = ${methodName}::<D>(${args});
if ok {
return true;
}
return exception_to_promise(cx, args.rval(), CanGc::note());
""",
methodName=self.method_call,
args=", ".join(arg.name for arg in self.args),
))
@staticmethod
def makeOrigName(descriptor, m):
return f'get_{descriptor.internalNameFor(m.identifier.name)}'
@staticmethod
def makeNativeName(descriptor, m):
return f"{CGGetterPromiseWrapper.makeOrigName(descriptor, m)}_promise_wrapper"
class CGDefaultToJSONMethod(CGSpecializedMethod):
def __init__(self, descriptor, method):
assert method.isDefaultToJSON()
CGSpecializedMethod.__init__(self, descriptor, method)
def definition_body(self):
ret = dedent("""
use crate::inheritance::HasParent;
rooted!(in(cx) let result = JS_NewPlainObject(cx));
if result.is_null() {
return false;
}
""")
jsonDescriptors = [self.descriptor]
interface = self.descriptor.interface.parent
while interface:
descriptor = self.descriptor.getDescriptor(interface.identifier.name)
if descriptor.hasDefaultToJSON:
jsonDescriptors.append(descriptor)
interface = interface.parent
parents = len(jsonDescriptors) - 1
form = """
if !${parentclass}CollectJSONAttributes::<D>(cx, _obj, this, result.handle()) {
return false;
}
"""
# Iterate the array in reverse: oldest ancestor first
for descriptor in jsonDescriptors[:0:-1]:
ret += fill(form, parentclass=f"{toBindingNamespace(descriptor.name)}::")
parents -= 1
ret += fill(form, parentclass="")
ret += ('(*args).rval().set(ObjectValue(*result));\n'
'true\n')
return CGGeneric(ret)
class CGStaticMethod(CGAbstractStaticBindingMethod):
"""
A class for generating the Rust code for an IDL static method.
"""
def __init__(self, descriptor, method):
self.method = method
name = method.identifier.name
CGAbstractStaticBindingMethod.__init__(self, descriptor, name, templateArgs=["D: DomTypes"])
def generate_code(self):
nativeName = CGSpecializedMethod.makeNativeName(self.descriptor,
self.method)
safeContext = CGGeneric("let cx = SafeJSContext::from_ptr(cx);\n")
setupArgs = CGGeneric("let args = CallArgs::from_vp(vp, argc);\n")
call = CGMethodCall(["&global"], nativeName, True, self.descriptor, self.method)
return CGList([safeContext, setupArgs, call])
class CGSpecializedGetter(CGAbstractExternMethod):
"""
A class for generating the code for a specialized attribute getter
that the JIT can call with lower overhead.
"""
def __init__(self, descriptor, attr):
self.attr = attr
name = f'get_{descriptor.internalNameFor(attr.identifier.name)}'
args = [Argument('*mut JSContext', 'cx'),
Argument('RawHandleObject', '_obj'),
Argument('*mut libc::c_void', 'this'),
Argument('JSJitGetterCallArgs', 'args')]
CGAbstractExternMethod.__init__(self, descriptor, name, "bool", args, templateArgs=["D: DomTypes"])
def definition_body(self):
nativeName = CGSpecializedGetter.makeNativeName(self.descriptor,
self.attr)
return CGWrapper(CGGetterCall([], self.attr.type, nativeName,
self.descriptor, self.attr),
pre="let cx = SafeJSContext::from_ptr(cx);\n"
f"let this = &*(this as *const {self.descriptor.concreteType});\n")
@staticmethod
def makeNativeName(descriptor, attr):
name = attr.identifier.name
nativeName = descriptor.binaryNameFor(name)
if nativeName == name:
nativeName = descriptor.internalNameFor(name)
nativeName = MakeNativeName(nativeName)
infallible = ('infallible' in
descriptor.getExtendedAttributes(attr, getter=True))
if attr.type.nullable() or not infallible:
return f"Get{nativeName}"
return nativeName
class CGStaticGetter(CGAbstractStaticBindingMethod):
"""
A class for generating the C++ code for an IDL static attribute getter.
"""
def __init__(self, descriptor, attr):
self.attr = attr
name = f'get_{attr.identifier.name}'
CGAbstractStaticBindingMethod.__init__(self, descriptor, name, templateArgs=["D: DomTypes"])
def generate_code(self):
nativeName = CGSpecializedGetter.makeNativeName(self.descriptor,
self.attr)
safeContext = CGGeneric("let cx = SafeJSContext::from_ptr(cx);\n")
setupArgs = CGGeneric("let args = CallArgs::from_vp(vp, argc);\n")
call = CGGetterCall(["&global"], self.attr.type, nativeName, self.descriptor,
self.attr)
return CGList([safeContext, setupArgs, call])
class CGSpecializedSetter(CGAbstractExternMethod):
"""
A class for generating the code for a specialized attribute setter
that the JIT can call with lower overhead.
"""
def __init__(self, descriptor, attr):
self.attr = attr
name = f'set_{descriptor.internalNameFor(attr.identifier.name)}'
args = [Argument('*mut JSContext', 'cx'),
Argument('RawHandleObject', 'obj'),
Argument('*mut libc::c_void', 'this'),
Argument('JSJitSetterCallArgs', 'args')]
CGAbstractExternMethod.__init__(self, descriptor, name, "bool", args, templateArgs=["D: DomTypes"])
def definition_body(self):
nativeName = CGSpecializedSetter.makeNativeName(self.descriptor,
self.attr)
return CGWrapper(
CGSetterCall([], self.attr.type, nativeName, self.descriptor, self.attr),
pre=("let cx = SafeJSContext::from_ptr(cx);\n"
f"let this = &*(this as *const {self.descriptor.concreteType});\n")
)
@staticmethod
def makeNativeName(descriptor, attr):
name = attr.identifier.name
nativeName = descriptor.binaryNameFor(name)
if nativeName == name:
nativeName = descriptor.internalNameFor(name)
return f"Set{MakeNativeName(nativeName)}"
class CGStaticSetter(CGAbstractStaticBindingMethod):
"""
A class for generating the C++ code for an IDL static attribute setter.
"""
def __init__(self, descriptor, attr):
self.attr = attr
name = f'set_{attr.identifier.name}'
CGAbstractStaticBindingMethod.__init__(self, descriptor, name, templateArgs=["D: DomTypes"])
def generate_code(self):
nativeName = CGSpecializedSetter.makeNativeName(self.descriptor,
self.attr)
safeContext = CGGeneric("let cx = SafeJSContext::from_ptr(cx);\n")
checkForArg = CGGeneric(
"let args = CallArgs::from_vp(vp, argc);\n"
"if argc == 0 {\n"
f' throw_type_error(*cx, "Not enough arguments to {self.attr.identifier.name} setter.");\n'
" return false;\n"
"}")
call = CGSetterCall(["&global"], self.attr.type, nativeName, self.descriptor,
self.attr)
return CGList([safeContext, checkForArg, call])
class CGSpecializedForwardingSetter(CGSpecializedSetter):
"""
A class for generating the code for an IDL attribute forwarding setter.
"""
def __init__(self, descriptor, attr):
CGSpecializedSetter.__init__(self, descriptor, attr)
def definition_body(self):
attrName = self.attr.identifier.name
forwardToAttrName = self.attr.getExtendedAttribute("PutForwards")[0]
# JS_GetProperty and JS_SetProperty can only deal with ASCII
assert all(ord(c) < 128 for c in attrName)
assert all(ord(c) < 128 for c in forwardToAttrName)
return CGGeneric(f"""
let cx = SafeJSContext::from_ptr(cx);
rooted!(in(*cx) let mut v = UndefinedValue());
if !JS_GetProperty(*cx, HandleObject::from_raw(obj), {str_to_cstr_ptr(attrName)}, v.handle_mut()) {{
return false;
}}
if !v.is_object() {{
throw_type_error(*cx, "Value.{attrName} is not an object.");
return false;
}}
rooted!(in(*cx) let target_obj = v.to_object());
JS_SetProperty(*cx, target_obj.handle(), {str_to_cstr_ptr(forwardToAttrName)}, HandleValue::from_raw(args.get(0)))
""")
class CGSpecializedReplaceableSetter(CGSpecializedSetter):
"""
A class for generating the code for an IDL replaceable attribute setter.
"""
def __init__(self, descriptor, attr):
CGSpecializedSetter.__init__(self, descriptor, attr)
def definition_body(self):
assert self.attr.readonly
name = str_to_cstr_ptr(self.attr.identifier.name)
# JS_DefineProperty can only deal with ASCII.
assert all(ord(c) < 128 for c in name)
return CGGeneric(f"""
JS_DefineProperty(cx, HandleObject::from_raw(obj), {name},
HandleValue::from_raw(args.get(0)), JSPROP_ENUMERATE as u32)""")
class CGMemberJITInfo(CGThing):
"""
A class for generating the JITInfo for a property that points to
our specialized getter and setter.
"""
def __init__(self, descriptor, member):
self.member = member
self.descriptor = descriptor
def defineJitInfo(self, infoName, opName, opType, infallible, movable,
aliasSet, alwaysInSlot, lazilyInSlot, slotIndex,
returnTypes, args):
"""
aliasSet is a JSJitInfo_AliasSet value, without the "JSJitInfo_AliasSet::" bit.
args is None if we don't want to output argTypes for some
reason (e.g. we have overloads or we're not a method) and
otherwise an iterable of the arguments for this method.
"""
assert not movable or aliasSet != "AliasEverything" # Can't move write-aliasing things
assert not alwaysInSlot or movable # Things always in slots had better be movable
def jitInfoInitializer(isTypedMethod):
initializer = fill(
"""
JSJitInfo {
__bindgen_anon_1: JSJitInfo__bindgen_ty_1 {
${opKind}: ${opValue}
},
__bindgen_anon_2: JSJitInfo__bindgen_ty_2 {
protoID: PrototypeList::ID::${name} as u16,
},
__bindgen_anon_3: JSJitInfo__bindgen_ty_3 { depth: ${depth} },
_bitfield_align_1: [],
_bitfield_1: __BindgenBitfieldUnit::new(
new_jsjitinfo_bitfield_1!(
JSJitInfo_OpType::${opType} as u8,
JSJitInfo_AliasSet::${aliasSet} as u8,
JSValueType::${returnType} as u8,
${isInfallible},
${isMovable},
${isEliminatable},
${isAlwaysInSlot},
${isLazilyCachedInSlot},
${isTypedMethod},
${slotIndex},
).to_ne_bytes()
),
}
""",
opValue=f"Some({opName}::<D>)",
name=self.descriptor.name,
depth=self.descriptor.interface.inheritanceDepth(),
opType=opType,
opKind=opType.lower(),
aliasSet=aliasSet,
returnType=functools.reduce(CGMemberJITInfo.getSingleReturnType, returnTypes,
""),
isInfallible=toStringBool(infallible),
isMovable=toStringBool(movable),
# FIXME(nox): https://github.com/servo/servo/issues/10991
isEliminatable=toStringBool(False),
isAlwaysInSlot=toStringBool(alwaysInSlot),
isLazilyCachedInSlot=toStringBool(lazilyInSlot),
isTypedMethod=toStringBool(isTypedMethod),
slotIndex=slotIndex)
return initializer.rstrip()
if args is not None:
argTypes = f"{infoName}_argTypes"
args = [CGMemberJITInfo.getJSArgType(arg.type) for arg in args]
args.append("JSJitInfo_ArgType::ArgTypeListEnd as i32")
argTypesDecl = f"const {argTypes}: [i32; {len(args)}] = [ {', '.join(args)} ];\n"
return fill(
"""
$*{argTypesDecl}
static ${infoName}: ThreadUnsafeOnceLock<JSTypedMethodJitInfo> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_${infoName}<D: DomTypes>() {
${infoName}.set(JSTypedMethodJitInfo {
base: ${jitInfoInit},
argTypes: &${argTypes} as *const _ as *const JSJitInfo_ArgType,
});
}
""",
argTypesDecl=argTypesDecl,
infoName=infoName,
jitInfoInit=indent(jitInfoInitializer(True)),
argTypes=argTypes)
return f"""
static {infoName}: ThreadUnsafeOnceLock<JSJitInfo> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_{infoName}<D: DomTypes>() {{
{infoName}.set({jitInfoInitializer(False)});
}}"""
def define(self):
if self.member.isAttr():
internalMemberName = self.descriptor.internalNameFor(self.member.identifier.name)
getterinfo = f"{internalMemberName}_getterinfo"
getter = f"get_{internalMemberName}"
if self.member.type.isPromise():
getter = CGGetterPromiseWrapper.makeNativeName(self.descriptor, self.member)
getterinfal = "infallible" in self.descriptor.getExtendedAttributes(self.member, getter=True)
movable = self.mayBeMovable() and getterinfal
aliasSet = self.aliasSet()
isAlwaysInSlot = self.member.getExtendedAttribute("StoreInSlot")
if self.member.slotIndices is not None:
assert isAlwaysInSlot or self.member.getExtendedAttribute("Cached")
isLazilyCachedInSlot = not isAlwaysInSlot
slotIndex = memberReservedSlot(self.member) # noqa:FIXME: memberReservedSlot is not defined
# We'll statically assert that this is not too big in
# CGUpdateMemberSlotsMethod, in the case when
# isAlwaysInSlot is true.
else:
isLazilyCachedInSlot = False
slotIndex = "0"
result = self.defineJitInfo(getterinfo, getter, "Getter",
getterinfal, movable, aliasSet,
isAlwaysInSlot, isLazilyCachedInSlot,
slotIndex,
[self.member.type], None)
if (not self.member.readonly or self.member.getExtendedAttribute("PutForwards")
or self.member.getExtendedAttribute("Replaceable")):
setterinfo = f"{internalMemberName}_setterinfo"
setter = f"set_{internalMemberName}"
# Setters are always fallible, since they have to do a typed unwrap.
result += self.defineJitInfo(setterinfo, setter, "Setter",
False, False, "AliasEverything",
False, False, "0",
[BuiltinTypes[IDLBuiltinType.Types.undefined]],
None)
return result
if self.member.isMethod():
methodinfo = f"{self.member.identifier.name}_methodinfo"
method = f"{self.member.identifier.name}"
if self.member.returnsPromise():
method = CGMethodPromiseWrapper.makeNativeName(self.descriptor, self.member)
# Methods are infallible if they are infallible, have no arguments
# to unwrap, and have a return type that's infallible to wrap up for
# return.
sigs = self.member.signatures()
if len(sigs) != 1:
# Don't handle overloading. If there's more than one signature,
# one of them must take arguments.
methodInfal = False
args = None
movable = False
else:
sig = sigs[0]
# For methods that affect nothing, it's OK to set movable to our
# notion of infallible on the C++ side, without considering
# argument conversions, since argument conversions that can
# reliably throw would be effectful anyway and the jit doesn't
# move effectful things.
hasInfallibleImpl = "infallible" in self.descriptor.getExtendedAttributes(self.member)
movable = self.mayBeMovable() and hasInfallibleImpl
# XXXbz can we move the smarts about fallibility due to arg
# conversions into the JIT, using our new args stuff?
if (len(sig[1]) != 0):
# We have arguments or our return-value boxing can fail
methodInfal = False
else:
methodInfal = hasInfallibleImpl
# For now, only bother to output args if we're side-effect-free.
if self.member.affects == "Nothing":
args = sig[1]
else:
args = None
aliasSet = self.aliasSet()
result = self.defineJitInfo(methodinfo, method, "Method",
methodInfal, movable, aliasSet,
False, False, "0",
[s[0] for s in sigs], args)
return result
raise TypeError("Illegal member type to CGPropertyJITInfo")
def mayBeMovable(self):
"""
Returns whether this attribute or method may be movable, just
based on Affects/DependsOn annotations.
"""
affects = self.member.affects
dependsOn = self.member.dependsOn
assert affects in IDLInterfaceMember.AffectsValues
assert dependsOn in IDLInterfaceMember.DependsOnValues
# Things that are DependsOn=DeviceState are not movable, because we
# don't want them coalesced with each other or loop-hoisted, since
# their return value can change even if nothing is going on from our
# point of view.
return (affects == "Nothing"
and (dependsOn != "Everything" and dependsOn != "DeviceState"))
def aliasSet(self):
"""Returns the alias set to store in the jitinfo. This may not be the
effective alias set the JIT uses, depending on whether we have enough
information about our args to allow the JIT to prove that effectful
argument conversions won't happen.
"""
dependsOn = self.member.dependsOn
assert dependsOn in IDLInterfaceMember.DependsOnValues
if dependsOn == "Nothing" or dependsOn == "DeviceState":
assert self.member.affects == "Nothing"
return "AliasNone"
if dependsOn == "DOMState":
assert self.member.affects == "Nothing"
return "AliasDOMSets"
return "AliasEverything"
@staticmethod
def getJSReturnTypeTag(t):
if t.nullable():
# Sometimes it might return null, sometimes not
return "JSVAL_TYPE_UNKNOWN"
if t.isUndefined():
# No return, every time
return "JSVAL_TYPE_UNDEFINED"
if t.isSequence():
return "JSVAL_TYPE_OBJECT"
if t.isRecord():
return "JSVAL_TYPE_OBJECT"
if t.isPromise():
return "JSVAL_TYPE_OBJECT"
if t.isGeckoInterface():
return "JSVAL_TYPE_OBJECT"
if t.isString():
return "JSVAL_TYPE_STRING"
if t.isEnum():
return "JSVAL_TYPE_STRING"
if t.isCallback():
return "JSVAL_TYPE_OBJECT"
if t.isAny():
# The whole point is to return various stuff
return "JSVAL_TYPE_UNKNOWN"
if t.isObject():
return "JSVAL_TYPE_OBJECT"
if t.isSpiderMonkeyInterface():
return "JSVAL_TYPE_OBJECT"
if t.isUnion():
u = t.unroll()
if u.hasNullableType:
# Might be null or not
return "JSVAL_TYPE_UNKNOWN"
return functools.reduce(CGMemberJITInfo.getSingleReturnType,
u.flatMemberTypes, "")
if t.isDictionary():
return "JSVAL_TYPE_OBJECT"
if not t.isPrimitive():
raise TypeError(f"No idea what type {t} is.")
tag = t.tag()
if tag == IDLType.Tags.bool:
return "JSVAL_TYPE_BOOLEAN"
if tag in [IDLType.Tags.int8, IDLType.Tags.uint8,
IDLType.Tags.int16, IDLType.Tags.uint16,
IDLType.Tags.int32]:
return "JSVAL_TYPE_INT32"
if tag in [IDLType.Tags.int64, IDLType.Tags.uint64,
IDLType.Tags.unrestricted_float, IDLType.Tags.float,
IDLType.Tags.unrestricted_double, IDLType.Tags.double]:
# These all use JS_NumberValue, which can return int or double.
# But TI treats "double" as meaning "int or double", so we're
# good to return JSVAL_TYPE_DOUBLE here.
return "JSVAL_TYPE_DOUBLE"
if tag != IDLType.Tags.uint32:
raise TypeError(f"No idea what type {t} is.")
# uint32 is sometimes int and sometimes double.
return "JSVAL_TYPE_DOUBLE"
@staticmethod
def getSingleReturnType(existingType, t):
type = CGMemberJITInfo.getJSReturnTypeTag(t)
if existingType == "":
# First element of the list; just return its type
return type
if type == existingType:
return existingType
if ((type == "JSVAL_TYPE_DOUBLE"
and existingType == "JSVAL_TYPE_INT32")
or (existingType == "JSVAL_TYPE_DOUBLE"
and type == "JSVAL_TYPE_INT32")):
# Promote INT32 to DOUBLE as needed
return "JSVAL_TYPE_DOUBLE"
# Different types
return "JSVAL_TYPE_UNKNOWN"
@staticmethod
def getJSArgType(t):
assert not t.isUndefined()
if t.nullable():
# Sometimes it might return null, sometimes not
return f"JSJitInfo_ArgType::Null as i32 | {CGMemberJITInfo.getJSArgType(t.inner)}"
if t.isSequence():
return "JSJitInfo_ArgType::Object as i32"
if t.isGeckoInterface():
return "JSJitInfo_ArgType::Object as i32"
if t.isString():
return "JSJitInfo_ArgType::String as i32"
if t.isEnum():
return "JSJitInfo_ArgType::String as i32"
if t.isCallback():
return "JSJitInfo_ArgType::Object as i32"
if t.isAny():
# The whole point is to return various stuff
return "JSJitInfo_ArgType::Any as i32"
if t.isObject():
return "JSJitInfo_ArgType::Object as i32"
if t.isSpiderMonkeyInterface():
return "JSJitInfo_ArgType::Object as i32"
if t.isUnion():
u = t.unroll()
type = "JSJitInfo_ArgType::Null as i32" if u.hasNullableType else ""
return functools.reduce(CGMemberJITInfo.getSingleArgType,
u.flatMemberTypes, type)
if t.isDictionary():
return "JSJitInfo_ArgType::Object as i32"
if not t.isPrimitive():
raise TypeError(f"No idea what type {t} is.")
tag = t.tag()
if tag == IDLType.Tags.bool:
return "JSJitInfo_ArgType::Boolean as i32"
if tag in [IDLType.Tags.int8, IDLType.Tags.uint8,
IDLType.Tags.int16, IDLType.Tags.uint16,
IDLType.Tags.int32]:
return "JSJitInfo_ArgType::Integer as i32"
if tag in [IDLType.Tags.int64, IDLType.Tags.uint64,
IDLType.Tags.unrestricted_float, IDLType.Tags.float,
IDLType.Tags.unrestricted_double, IDLType.Tags.double]:
# These all use JS_NumberValue, which can return int or double.
# But TI treats "double" as meaning "int or double", so we're
# good to return JSVAL_TYPE_DOUBLE here.
return "JSJitInfo_ArgType::Double as i32"
if tag != IDLType.Tags.uint32:
raise TypeError(f"No idea what type {t} is.")
# uint32 is sometimes int and sometimes double.
return "JSJitInfo_ArgType::Double as i32"
@staticmethod
def getSingleArgType(existingType, t):
type = CGMemberJITInfo.getJSArgType(t)
if existingType == "":
# First element of the list; just return its type
return type
if type == existingType:
return existingType
return f"{existingType} | {type}"
# https://searchfox.org/mozilla-central/rev/9993372dd72daea851eba4600d5750067104bc15/dom/bindings/Codegen.py#12355-12374
class CGStaticMethodJitinfo(CGGeneric):
"""
A class for generating the JITInfo for a promise-returning static method.
"""
def __init__(self, method):
CGGeneric.__init__(
self,
f"""
static {method.identifier.name}_methodinfo: ThreadUnsafeOnceLock<JSJitInfo> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_{method.identifier.name}_methodinfo<D: DomTypes>() {{
{method.identifier.name}_methodinfo.set(JSJitInfo {{
__bindgen_anon_1: JSJitInfo__bindgen_ty_1 {{
staticMethod: Some({method.identifier.name}::<D>)
}},
__bindgen_anon_2: JSJitInfo__bindgen_ty_2 {{
protoID: PrototypeList::ID::Last as u16,
}},
__bindgen_anon_3: JSJitInfo__bindgen_ty_3 {{ depth: 0 }},
_bitfield_align_1: [],
_bitfield_1: __BindgenBitfieldUnit::new(
new_jsjitinfo_bitfield_1!(
JSJitInfo_OpType::StaticMethod as u8,
JSJitInfo_AliasSet::AliasEverything as u8,
JSValueType::JSVAL_TYPE_OBJECT as u8,
false,
false,
false,
false,
false,
false,
0,
).to_ne_bytes()
),
}});
}}
"""
)
def getEnumValueName(value):
# Some enum values can be empty strings. Others might have weird
# characters in them. Deal with the former by returning "_empty",
# deal with possible name collisions from that by throwing if the
# enum value is actually "_empty", and throw on any value
# containing non-ASCII chars for now. Replace all chars other than
# [0-9A-Za-z_] with '_'.
if re.match("[^\x20-\x7E]", value):
raise SyntaxError(f'Enum value "{value}" contains non-ASCII characters')
if re.match("^[0-9]", value):
value = '_' + value
value = re.sub(r'[^0-9A-Za-z_]', '_', value)
if re.match("^_[A-Z]|__", value):
raise SyntaxError(f'Enum value "{value}" is reserved by the C++ spec')
if value == "_empty":
raise SyntaxError('"_empty" is not an IDL enum value we support yet')
if value == "":
return "_empty"
return MakeNativeName(value)
class CGEnum(CGThing):
def __init__(self, enum, config):
CGThing.__init__(self)
ident = enum.identifier.name
enums = ",\n ".join(map(getEnumValueName, list(enum.values())))
derives = ["Copy", "Clone", "Debug", "JSTraceable", "MallocSizeOf", "PartialEq"]
enum_config = config.getEnumConfig(ident)
extra_derives = enum_config.get('derives', [])
derives = ', '.join(derives + extra_derives)
decl = f"""
#[repr(usize)]
#[derive({derives})]
pub enum {ident} {{
{enums}
}}
"""
pairs = ",\n ".join([f'("{val}", super::{ident}::{getEnumValueName(val)})'
for val in list(enum.values())])
inner = f"""
use crate::utils::find_enum_value;
use js::conversions::ConversionResult;
use js::conversions::FromJSValConvertible;
use js::conversions::ToJSValConvertible;
use js::jsapi::JSContext;
use js::rust::HandleValue;
use js::rust::MutableHandleValue;
use js::jsval::JSVal;
pub(crate) const pairs: &[(&str, super::{ident})] = &[
{pairs},
];
impl super::{ident} {{
pub fn as_str(&self) -> &'static str {{
pairs[*self as usize].0
}}
}}
impl Default for super::{ident} {{
fn default() -> super::{ident} {{
pairs[0].1
}}
}}
impl std::str::FromStr for super::{ident} {{
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {{
pairs
.iter()
.find(|&&(key, _)| s == key)
.map(|&(_, ev)| ev)
.ok_or(())
}}
}}
impl ToJSValConvertible for super::{ident} {{
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {{
pairs[*self as usize].0.to_jsval(cx, rval);
}}
}}
impl FromJSValConvertible for super::{ident} {{
type Config = ();
unsafe fn from_jsval(cx: *mut JSContext, value: HandleValue, _option: ())
-> Result<ConversionResult<super::{ident}>, ()> {{
match find_enum_value(cx, value, pairs) {{
Err(_) => Err(()),
Ok((None, search)) => {{
Ok(ConversionResult::Failure(
format!("'{{}}' is not a valid enum value for enumeration '{ident}'.", search).into()
))
}}
Ok((Some(&value), _)) => Ok(ConversionResult::Success(value)),
}}
}}
}}
"""
self.cgRoot = CGList([
CGGeneric(decl),
CGNamespace.build([f"{ident}Values"],
CGIndenter(CGGeneric(inner)), public=True),
])
def define(self):
return self.cgRoot.define()
def convertConstIDLValueToRust(value):
tag = value.type.tag()
if tag in [IDLType.Tags.int8, IDLType.Tags.uint8,
IDLType.Tags.int16, IDLType.Tags.uint16,
IDLType.Tags.int32, IDLType.Tags.uint32,
IDLType.Tags.int64, IDLType.Tags.uint64,
IDLType.Tags.unrestricted_float, IDLType.Tags.float,
IDLType.Tags.unrestricted_double, IDLType.Tags.double]:
return str(value.value)
if tag == IDLType.Tags.bool:
return toStringBool(value.value)
raise TypeError(f"Const value of unhandled type: {value.type}")
class CGConstant(CGThing):
def __init__(self, constant):
CGThing.__init__(self)
self.constant = constant
def define(self):
name = self.constant.identifier.name
value = convertConstIDLValueToRust(self.constant.value)
tag = self.constant.value.type.tag()
const_type = builtinNames[self.constant.value.type.tag()]
# Finite<f32> or Finite<f64> cannot be used un a constant declaration.
# Remote the Finite type from restricted float and double tag declarations.
if tag == IDLType.Tags.float:
const_type = "f32"
elif tag == IDLType.Tags.double:
const_type = "f64"
return f"pub const {name}: {const_type} = {value};\n"
def getUnionTypeTemplateVars(type, descriptorProvider):
if type.isGeckoInterface():
name = type.inner.identifier.name
typeName = descriptorProvider.getDescriptor(name).returnType
elif type.isEnum():
name = type.inner.identifier.name
typeName = name
elif type.isDictionary():
name = type.name
typeName = name
if containsDomInterface(type):
typeName += "<D>"
elif type.isSequence() or type.isRecord():
name = type.name
inner = getUnionTypeTemplateVars(innerContainerType(type), descriptorProvider)
typeName = wrapInNativeContainerType(type, CGGeneric(inner["typeName"])).define()
elif type.isByteString():
name = type.name
typeName = "ByteString"
elif type.isDOMString():
name = type.name
typeName = "DOMString"
elif type.isUSVString():
name = type.name
typeName = "USVString"
elif type.isPrimitive():
name = type.name
typeName = builtinNames[type.tag()]
elif type.isObject():
name = type.name
typeName = "Heap<*mut JSObject>"
elif is_typed_array(type):
name = type.name
typeName = f"typedarray::Heap{name}"
elif type.isCallback():
name = type.name
typeName = f"{name}<D>"
else:
raise TypeError(f"Can't handle {type} in unions yet")
info = getJSToNativeConversionInfo(
type, descriptorProvider, failureCode="return Ok(None);",
exceptionCode='return Err(());',
isDefinitelyObject=True,
isMember="Union")
template = info.template
jsConversion = string.Template(template).substitute({
"val": "value",
})
jsConversion = CGWrapper(CGGeneric(jsConversion), pre="Ok(Some(", post="))")
return {
"name": name,
"typeName": typeName,
"jsConversion": jsConversion,
}
def traitRequiresManualImpl(name, ty):
return name == "Clone" and containsDomInterface(ty)
class CGUnionStruct(CGThing):
def __init__(self, type, descriptorProvider, config):
assert not type.nullable()
assert not type.hasNullableType
CGThing.__init__(self)
self.type = type
derivesList = config.getUnionConfig(str(type)).get('derives', [])
self.manualImpls = list(filter(lambda t: traitRequiresManualImpl(t, type), derivesList))
self.derives = list(filter(lambda t: not traitRequiresManualImpl(t, type), derivesList))
self.descriptorProvider = descriptorProvider
self.generic, self.genericSuffix = genericsForType(self.type)
def membersNeedTracing(self):
for t in self.type.flatMemberTypes:
if type_needs_tracing(t):
return True
return False
def manualImplClone(self, templateVars):
arms = [f" {self.type}::{v['name']}(inner) => "
f"{self.type}::{v['name']}(inner.clone()),"
for (v, _) in templateVars]
arms = "\n".join(arms)
return f"""
#[allow(clippy::clone_on_copy)]
impl{self.generic} Clone for {self.type}{self.genericSuffix} {{
fn clone(&self) -> Self {{
match self {{
{arms}
}}
}}
}}
"""
def manualImpl(self, t, templateVars):
if t == "Clone":
return self.manualImplClone(templateVars)
raise f"Don't know how to impl {t} for union"
def define(self):
def getTypeWrapper(t):
if type_needs_tracing(t):
return "RootedTraceableBox"
if t.isCallback():
return "Rc"
return ""
templateVars = [(getUnionTypeTemplateVars(t, self.descriptorProvider),
getTypeWrapper(t)) for t in self.type.flatMemberTypes]
enumValues = [
f" {v['name']}({wrapper}<{v['typeName']}>)," if wrapper else f" {v['name']}({v['typeName']}),"
for (v, wrapper) in templateVars
]
enumConversions = [
f" {self.type}::{v['name']}(ref inner) => inner.to_jsval(cx, rval),"
for (v, _) in templateVars
]
joinedEnumValues = "\n".join(enumValues)
joinedEnumConversions = "\n".join(enumConversions)
derives = ["JSTraceable"] + self.derives
manualImpls = "\n".join(map(lambda t: self.manualImpl(t, templateVars), self.manualImpls))
return f"""
#[derive({", ".join(derives)})]
pub enum {self.type}{self.generic} {{
{joinedEnumValues}
}}
impl{self.generic} ToJSValConvertible for {self.type}{self.genericSuffix} {{
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {{
match *self {{
{joinedEnumConversions}
}}
}}
}}
{manualImpls}
"""
class CGUnionConversionStruct(CGThing):
def __init__(self, type, descriptorProvider):
assert not type.nullable()
assert not type.hasNullableType
CGThing.__init__(self)
self.type = type
self.descriptorProvider = descriptorProvider
def membersNeedTracing(self):
for t in self.type.flatMemberTypes:
if type_needs_tracing(t):
return True
return False
def from_jsval(self):
memberTypes = self.type.flatMemberTypes
names = []
conversions = []
def get_name(memberType):
if self.type.isGeckoInterface():
return memberType.inner.identifier.name
return memberType.name
def get_match(name):
generic = "::<D>" if containsDomInterface(self.type) else ""
return (
f"match {self.type}{generic}::TryConvertTo{name}(SafeJSContext::from_ptr(cx), value) {{\n"
" Err(_) => return Err(()),\n"
f" Ok(Some(value)) => return Ok(ConversionResult::Success({self.type}::{name}(value))),\n"
" Ok(None) => (),\n"
"}\n")
interfaceMemberTypes = [t for t in memberTypes if t.isNonCallbackInterface()]
if len(interfaceMemberTypes) > 0:
typeNames = [get_name(memberType) for memberType in interfaceMemberTypes]
interfaceObject = CGList(CGGeneric(get_match(typeName)) for typeName in typeNames)
names.extend(typeNames)
else:
interfaceObject = None
arrayObjectMemberTypes = [t for t in memberTypes if t.isSequence()]
if len(arrayObjectMemberTypes) > 0:
assert len(arrayObjectMemberTypes) == 1
typeName = arrayObjectMemberTypes[0].name
arrayObject = CGGeneric(get_match(typeName))
names.append(typeName)
else:
arrayObject = None
callbackMemberTypes = [t for t in memberTypes if t.isCallback() or t.isCallbackInterface()]
if len(callbackMemberTypes) > 0:
assert len(callbackMemberTypes) == 1
typeName = callbackMemberTypes[0].name
callbackObject = CGGeneric(get_match(typeName))
else:
callbackObject = None
dictionaryMemberTypes = [t for t in memberTypes if t.isDictionary()]
if len(dictionaryMemberTypes) > 0:
assert len(dictionaryMemberTypes) == 1
typeName = dictionaryMemberTypes[0].name
dictionaryObject = CGGeneric(get_match(typeName))
names.append(typeName)
else:
dictionaryObject = None
objectMemberTypes = [t for t in memberTypes if t.isObject()]
if len(objectMemberTypes) > 0:
assert len(objectMemberTypes) == 1
typeName = objectMemberTypes[0].name
object = CGGeneric(get_match(typeName))
names.append(typeName)
else:
object = None
mozMapMemberTypes = [t for t in memberTypes if t.isRecord()]
if len(mozMapMemberTypes) > 0:
assert len(mozMapMemberTypes) == 1
typeName = mozMapMemberTypes[0].name
mozMapObject = CGGeneric(get_match(typeName))
names.append(typeName)
else:
mozMapObject = None
hasObjectTypes = object or interfaceObject or arrayObject or callbackObject or mozMapObject
if hasObjectTypes:
# "object" is not distinguishable from other types
assert not object or not (interfaceObject or arrayObject or callbackObject or mozMapObject)
templateBody = CGList([], "\n")
if arrayObject or callbackObject:
# An object can be both an sequence object and a callback or
# dictionary, but we shouldn't have both in the union's members
# because they are not distinguishable.
assert not (arrayObject and callbackObject)
templateBody.append(arrayObject if arrayObject else callbackObject)
if interfaceObject:
assert not object
templateBody.append(interfaceObject)
elif object:
templateBody.append(object)
if mozMapObject:
templateBody.append(mozMapObject)
conversions.append(CGIfWrapper("value.get().is_object()", templateBody))
if dictionaryObject:
assert not object
conversions.append(dictionaryObject)
stringTypes = [t for t in memberTypes if t.isString() or t.isEnum()]
numericTypes = [t for t in memberTypes if t.isNumeric()]
booleanTypes = [t for t in memberTypes if t.isBoolean()]
if stringTypes or numericTypes or booleanTypes:
assert len(stringTypes) <= 1
assert len(numericTypes) <= 1
assert len(booleanTypes) <= 1
def getStringOrPrimitiveConversion(memberType):
typename = get_name(memberType)
return CGGeneric(get_match(typename))
other = []
stringConversion = list(map(getStringOrPrimitiveConversion, stringTypes))
numericConversion = list(map(getStringOrPrimitiveConversion, numericTypes))
booleanConversion = list(map(getStringOrPrimitiveConversion, booleanTypes))
if stringConversion:
if booleanConversion:
other.append(CGIfWrapper("value.get().is_boolean()", booleanConversion[0]))
if numericConversion:
other.append(CGIfWrapper("value.get().is_number()", numericConversion[0]))
other.append(stringConversion[0])
elif numericConversion:
if booleanConversion:
other.append(CGIfWrapper("value.get().is_boolean()", booleanConversion[0]))
other.append(numericConversion[0])
else:
assert booleanConversion
other.append(booleanConversion[0])
conversions.append(CGList(other, "\n\n"))
conversions.append(CGGeneric(
f'Ok(ConversionResult::Failure("argument could not be converted to any of: {", ".join(names)}".into()))'
))
generic, genericSuffix = genericsForType(self.type)
method = CGWrapper(
CGIndenter(CGList(conversions, "\n\n")),
pre="unsafe fn from_jsval(cx: *mut JSContext,\n"
" value: HandleValue,\n"
" _option: ())\n"
f" -> Result<ConversionResult<{self.type}{genericSuffix}>, ()> {{\n",
post="\n}")
return CGWrapper(
CGIndenter(CGList([
CGGeneric("type Config = ();"),
method,
], "\n")),
pre=f"impl{generic} FromJSValConvertible for {self.type}{genericSuffix} {{\n",
post="\n}")
def try_method(self, t):
templateVars = getUnionTypeTemplateVars(t, self.descriptorProvider)
actualType = templateVars["typeName"]
if type_needs_tracing(t):
actualType = f"RootedTraceableBox<{actualType}>"
if t.isCallback():
actualType = f"Rc<{actualType}>"
returnType = f"Result<Option<{actualType}>, ()>"
jsConversion = templateVars["jsConversion"]
return CGWrapper(
CGIndenter(jsConversion, 4),
pre=f"unsafe fn TryConvertTo{t.name}(cx: SafeJSContext, value: HandleValue) -> {returnType} {{\n",
post="\n}")
def define(self):
from_jsval = self.from_jsval()
methods = CGIndenter(CGList([
self.try_method(t) for t in self.type.flatMemberTypes
], "\n\n"))
generic, genericSuffix = genericsForType(self.type)
return f"""
{from_jsval.define()}
impl{generic} {self.type}{genericSuffix} {{
{methods.define()}
}}
"""
class ClassItem:
""" Use with CGClass """
def __init__(self, name, visibility):
self.name = name
self.visibility = visibility
def declare(self, cgClass):
assert False
def define(self, cgClass):
assert False
class ClassBase(ClassItem):
def __init__(self, name, visibility='pub'):
ClassItem.__init__(self, name, visibility)
def declare(self, cgClass):
return f'{self.visibility} {self.name}'
def define(self, cgClass):
# Only in the header
return ''
class ClassMethod(ClassItem):
def __init__(self, name, returnType, args, inline=False, static=False,
virtual=False, const=False, bodyInHeader=False,
templateArgs=None, visibility='public', body=None,
breakAfterReturnDecl="\n", unsafe=False,
breakAfterSelf="\n", override=False):
"""
override indicates whether to flag the method as MOZ_OVERRIDE
"""
assert not override or virtual
assert not (override and static)
self.returnType = returnType
self.args = args
self.inline = False
self.static = static
self.virtual = virtual
self.const = const
self.bodyInHeader = True
self.templateArgs = templateArgs
self.body = body
self.breakAfterReturnDecl = breakAfterReturnDecl
self.breakAfterSelf = breakAfterSelf
self.override = override
self.unsafe = unsafe
ClassItem.__init__(self, name, visibility)
def getDecorators(self, declaring):
decorators = []
if self.inline:
decorators.append('inline')
if declaring:
if self.static:
decorators.append('static')
if self.virtual:
decorators.append('virtual')
if decorators:
return f'{" ".join(decorators)} '
return ''
def getBody(self):
# Override me or pass a string to constructor
assert self.body is not None
return self.body
def declare(self, cgClass):
templateClause = f"<{', '.join(self.templateArgs)}>" if self.bodyInHeader and self.templateArgs else '<>'
args = ', '.join([a.declare() for a in self.args])
if self.bodyInHeader:
body = CGIndenter(CGGeneric(self.getBody())).define()
body = f' {{\n{body}\n}}'
else:
body = ';'
visibility = f'{self.visibility} ' if self.visibility != 'priv' else ''
unsafe = "unsafe " if self.unsafe else ""
returnType = f" -> {self.returnType}" if self.returnType else ""
const = ' const' if self.const else ''
override = ' MOZ_OVERRIDE' if self.override else ''
return (
f"{self.getDecorators(True)}{self.breakAfterReturnDecl}"
f"{visibility}{unsafe}fn {self.name}{templateClause}({args})"
f"{returnType}{const}{override}{body}{self.breakAfterSelf}"
)
def define(self, cgClass):
pass
class ClassConstructor(ClassItem):
"""
Used for adding a constructor to a CGClass.
args is a list of Argument objects that are the arguments taken by the
constructor.
inline should be True if the constructor should be marked inline.
bodyInHeader should be True if the body should be placed in the class
declaration in the header.
visibility determines the visibility of the constructor (public,
protected, private), defaults to private.
explicit should be True if the constructor should be marked explicit.
baseConstructors is a list of strings containing calls to base constructors,
defaults to None.
body contains a string with the code for the constructor, defaults to empty.
"""
def __init__(self, args, inline=False, bodyInHeader=False,
visibility="priv", explicit=False, baseConstructors=None,
body=""):
self.args = args
self.inline = False
self.bodyInHeader = bodyInHeader
self.explicit = explicit
self.baseConstructors = baseConstructors or []
self.body = body
ClassItem.__init__(self, None, visibility)
def getDecorators(self, declaring):
decorators = []
if self.explicit:
decorators.append('explicit')
if self.inline and declaring:
decorators.append('inline')
if decorators:
return f'{" ".join(decorators)} '
return ''
def getInitializationList(self, cgClass):
items = [str(c) for c in self.baseConstructors]
for m in cgClass.members:
if not m.static:
initialize = m.body
if initialize:
items.append(f"{m.name}({initialize})")
if len(items) > 0:
joinedItems = ",\n ".join(items)
return f'\n : {joinedItems}'
return ''
def getBody(self, cgClass):
initializers = [f" parent: {self.baseConstructors[0]}"]
joinedInitializers = '\n'.join(initializers)
return (
f"{self.body}"
f"let mut ret = Rc::new({cgClass.name} {{\n"
f"{joinedInitializers}\n"
"});\n"
"// Note: callback cannot be moved after calling init.\n"
"match Rc::get_mut(&mut ret) {\n"
f" Some(ref mut callback) => callback.parent.init({self.args[0].name}, {self.args[1].name}),\n"
" None => unreachable!(),\n"
"};\n"
"ret"
)
def declare(self, cgClass):
args = ', '.join([a.declare() for a in self.args])
body = f' {self.getBody(cgClass)}'
body = stripTrailingWhitespace(body.replace('\n', '\n '))
if len(body) > 0:
body += '\n'
body = f' {{\n{body}}}'
name = cgClass.getNameString().replace(': DomTypes', '')
return f"""
pub unsafe fn {self.getDecorators(True)}new({args}) -> Rc<{name}>{body}
"""
def define(self, cgClass):
if self.bodyInHeader:
return ''
args = ', '.join([a.define() for a in self.args])
body = f' {self.getBody()}'
trimmedBody = stripTrailingWhitespace(body.replace('\n', '\n '))
body = f'\n{trimmedBody}'
if len(body) > 0:
body += '\n'
className = cgClass.getNameString()
return f"""
{self.getDecorators(False)}
{className}::{className}({args}){self.getInitializationList(cgClass)}
{{{body}}}
"""
class ClassMember(ClassItem):
def __init__(self, name, type, visibility="priv", static=False,
body=None):
self.type = type
self.static = static
self.body = body
ClassItem.__init__(self, name, visibility)
def declare(self, cgClass):
return f'{self.visibility} {self.name}: {self.type},\n'
def define(self, cgClass):
if not self.static:
return ''
if self.body:
body = f" = {self.body}"
else:
body = ""
return f'{self.type} {cgClass.getNameString()}::{self.name}{body};\n'
class CGClass(CGThing):
def __init__(self, name, bases=[], members=[], constructors=[],
destructor=None, methods=[],
typedefs=[], enums=[], unions=[], templateArgs=[],
templateSpecialization=[],
disallowCopyConstruction=False, indent='',
decorators='',
extradeclarations=''):
CGThing.__init__(self)
self.name = name
self.bases = bases
self.members = members
self.constructors = constructors
# We store our single destructor in a list, since all of our
# code wants lists of members.
self.destructors = [destructor] if destructor else []
self.methods = methods
self.typedefs = typedefs
self.enums = enums
self.unions = unions
self.templateArgs = templateArgs
self.templateSpecialization = templateSpecialization
self.disallowCopyConstruction = disallowCopyConstruction
self.indent = indent
self.decorators = decorators
self.extradeclarations = extradeclarations
def getNameString(self):
className = self.name
if self.templateSpecialization:
className = f"{className}<{', '.join([str(a) for a in self.templateSpecialization])}>"
return className
def define(self):
result = ''
if self.templateArgs:
templateArgs = [a.declare() for a in self.templateArgs]
templateArgs = templateArgs[len(self.templateSpecialization):]
result = f"{result}{self.indent}template <{','.join([str(a) for a in templateArgs])}>\n"
if self.templateSpecialization:
specialization = f"<{', '.join([str(a) for a in self.templateSpecialization])}>"
else:
specialization = ''
myself = ''
if self.decorators != '':
myself += f'{self.decorators}\n'
myself += f'{self.indent}pub struct {self.name}{specialization}'
result += myself
assert len(self.bases) == 1 # XXjdm Can we support multiple inheritance?
result += ' {\n'
if self.bases:
self.members = [ClassMember("parent", self.bases[0].name, "pub")] + self.members
result += CGIndenter(CGGeneric(self.extradeclarations),
len(self.indent)).define()
def declareMembers(cgClass, memberList):
result = ''
for member in memberList:
declaration = member.declare(cgClass)
declaration = CGIndenter(CGGeneric(declaration)).define()
result = f"{result}{declaration}"
return result
if self.disallowCopyConstruction:
class DisallowedCopyConstructor(object):
def __init__(self):
self.visibility = "private"
def declare(self, cgClass):
name = cgClass.getNameString()
return (f"{name}(const {name}&) MOZ_DELETE;\n"
f"void operator=(const {name}) MOZ_DELETE;\n")
disallowedCopyConstructors = [DisallowedCopyConstructor()]
else:
disallowedCopyConstructors = []
order = [(self.enums, ''), (self.unions, ''),
(self.typedefs, ''), (self.members, '')]
for (memberList, separator) in order:
memberString = declareMembers(self, memberList)
if self.indent:
memberString = CGIndenter(CGGeneric(memberString),
len(self.indent)).define()
result = f"{result}{memberString}"
result += f'{self.indent}}}\n\n'
result += f'impl{specialization} {self.name}{specialization.replace(": DomTypes", "")} {{\n'
order = [(self.constructors + disallowedCopyConstructors, '\n'),
(self.destructors, '\n'), (self.methods, '\n)')]
for (memberList, separator) in order:
memberString = declareMembers(self, memberList)
if self.indent:
memberString = CGIndenter(CGGeneric(memberString),
len(self.indent)).define()
result = f"{result}{memberString}"
result += "}"
return result
class CGProxySpecialOperation(CGPerSignatureCall):
"""
Base class for classes for calling an indexed or named special operation
(don't use this directly, use the derived classes below).
"""
def __init__(self, descriptor, operation):
nativeName = MakeNativeName(descriptor.binaryNameFor(operation))
operation = descriptor.operations[operation]
assert len(operation.signatures()) == 1
signature = operation.signatures()[0]
(returnType, arguments) = signature
if operation.isGetter() and not returnType.nullable():
returnType = IDLNullableType(returnType.location, returnType)
# We pass len(arguments) as the final argument so that the
# CGPerSignatureCall won't do any argument conversion of its own.
CGPerSignatureCall.__init__(self, returnType, "", arguments, nativeName,
False, descriptor, operation,
len(arguments))
if operation.isSetter():
# arguments[0] is the index or name of the item that we're setting.
argument = arguments[1]
info = getJSToNativeConversionInfo(
argument.type, descriptor,
exceptionCode="return false;")
template = info.template
declType = info.declType
templateValues = {
"val": "value.handle()",
}
self.cgRoot.prepend(instantiateJSToNativeConversionTemplate(
template, templateValues, declType, argument.identifier.name))
self.cgRoot.prepend(CGGeneric("rooted!(in(*cx) let value = desc.value_);"))
def getArguments(self):
args = [(a, process_arg(a.identifier.name, a)) for a in self.arguments]
return args
def wrap_return_value(self):
if not self.idlNode.isGetter() or self.templateValues is None:
return ""
wrap = CGGeneric(wrapForType(**self.templateValues))
wrap = CGIfWrapper("let Some(result) = result", wrap)
return f"\n{wrap.define()}"
class CGProxyIndexedGetter(CGProxySpecialOperation):
"""
Class to generate a call to an indexed getter. If templateValues is not None
the returned value will be wrapped with wrapForType using templateValues.
"""
def __init__(self, descriptor, templateValues=None):
self.templateValues = templateValues
CGProxySpecialOperation.__init__(self, descriptor, 'IndexedGetter')
class CGProxyIndexedSetter(CGProxySpecialOperation):
"""
Class to generate a call to an indexed setter.
"""
def __init__(self, descriptor):
CGProxySpecialOperation.__init__(self, descriptor, 'IndexedSetter')
class CGProxyNamedOperation(CGProxySpecialOperation):
"""
Class to generate a call to a named operation.
"""
def __init__(self, descriptor, name):
CGProxySpecialOperation.__init__(self, descriptor, name)
def define(self):
# Our first argument is the id we're getting.
argName = self.arguments[0].identifier.name
return (f'let {argName} = jsid_to_string(*cx, Handle::from_raw(id)).expect("Not a string-convertible JSID?");\n'
"let this = UnwrapProxy::<D>(proxy);\n"
"let this = &*this;\n"
f"{CGProxySpecialOperation.define(self)}")
class CGProxyNamedGetter(CGProxyNamedOperation):
"""
Class to generate a call to an named getter. If templateValues is not None
the returned value will be wrapped with wrapForType using templateValues.
"""
def __init__(self, descriptor, templateValues=None):
self.templateValues = templateValues
CGProxySpecialOperation.__init__(self, descriptor, 'NamedGetter')
class CGProxyNamedPresenceChecker(CGProxyNamedGetter):
"""
Class to generate a call that checks whether a named property exists.
For now, we just delegate to CGProxyNamedGetter
"""
def __init__(self, descriptor):
CGProxyNamedGetter.__init__(self, descriptor)
class CGProxyNamedSetter(CGProxyNamedOperation):
"""
Class to generate a call to a named setter.
"""
def __init__(self, descriptor):
CGProxySpecialOperation.__init__(self, descriptor, 'NamedSetter')
class CGProxyNamedDeleter(CGProxyNamedOperation):
"""
Class to generate a call to a named deleter.
"""
def __init__(self, descriptor):
CGProxySpecialOperation.__init__(self, descriptor, 'NamedDeleter')
def define(self):
# Our first argument is the id we're getting.
argName = self.arguments[0].identifier.name
return ("if !id.is_symbol() {\n"
f' let {argName} = match jsid_to_string(*cx, Handle::from_raw(id)) {{\n'
" Some(val) => val,\n"
" None => {\n"
" throw_type_error(*cx, \"Not a string-convertible JSID\");\n"
" return false;\n"
" }\n"
" };\n"
" let this = UnwrapProxy::<D>(proxy);\n"
" let this = &*this;\n"
f" {CGProxySpecialOperation.define(self)}"
"}\n")
class CGProxyUnwrap(CGAbstractMethod):
def __init__(self, descriptor):
args = [Argument('RawHandleObject', 'obj')]
CGAbstractMethod.__init__(self, descriptor, "UnwrapProxy",
f'*const {descriptor.concreteType}', args,
alwaysInline=True, unsafe=True,
templateArgs=['D: DomTypes'])
def definition_body(self):
return CGGeneric(f"""
let mut slot = UndefinedValue();
GetProxyReservedSlot(obj.get(), 0, &mut slot);
let box_ = slot.to_private() as *const {self.descriptor.concreteType};
return box_;""")
class CGDOMJSProxyHandler_getOwnPropertyDescriptor(CGAbstractExternMethod):
def __init__(self, descriptor):
args = [Argument('*mut JSContext', 'cx'), Argument('RawHandleObject', 'proxy'),
Argument('RawHandleId', 'id'),
Argument('RawMutableHandle<PropertyDescriptor>', 'mut desc'),
Argument('*mut bool', 'is_none')]
CGAbstractExternMethod.__init__(self, descriptor, "getOwnPropertyDescriptor",
"bool", args, templateArgs=['D: DomTypes'])
self.descriptor = descriptor
# https://heycam.github.io/webidl/#LegacyPlatformObjectGetOwnProperty
def getBody(self):
indexedGetter = self.descriptor.operations['IndexedGetter']
get = "let cx = SafeJSContext::from_ptr(cx);\n"
if self.descriptor.isMaybeCrossOriginObject():
get += dedent(
"""
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
if !proxyhandler::cross_origin_get_own_property_helper(
cx, proxy, CROSS_ORIGIN_PROPERTIES.get(), id, desc, &mut *is_none
) {
return false;
}
if *is_none {
return proxyhandler::cross_origin_property_fallback::<D>(cx, proxy, id, desc, &mut *is_none);
}
return true;
}
// Safe to enter the Realm of proxy now.
let _ac = JSAutoRealm::new(*cx, proxy.get());
""")
if indexedGetter:
get += "let index = get_array_index_from_id(Handle::from_raw(id));\n"
attrs = "JSPROP_ENUMERATE"
if self.descriptor.operations['IndexedSetter'] is None:
attrs += " | JSPROP_READONLY"
fillDescriptor = ("set_property_descriptor(\n"
" MutableHandle::from_raw(desc),\n"
" rval.handle(),\n"
f" ({attrs}) as u32,\n"
" &mut *is_none\n"
");\n"
"return true;")
templateValues = {
'jsvalRef': 'rval.handle_mut()',
'successCode': fillDescriptor,
'pre': 'rooted!(in(*cx) let mut rval = UndefinedValue());'
}
get += ("if let Some(index) = index {\n"
" let this = UnwrapProxy::<D>(proxy);\n"
" let this = &*this;\n"
f"{CGIndenter(CGProxyIndexedGetter(self.descriptor, templateValues)).define()}\n"
"}\n")
if self.descriptor.supportsNamedProperties():
attrs = []
if not self.descriptor.interface.getExtendedAttribute("LegacyUnenumerableNamedProperties"):
attrs.append("JSPROP_ENUMERATE")
if self.descriptor.operations['NamedSetter'] is None:
attrs.append("JSPROP_READONLY")
if attrs:
attrs = " | ".join(attrs)
else:
attrs = "0"
fillDescriptor = ("set_property_descriptor(\n"
" MutableHandle::from_raw(desc),\n"
" rval.handle(),\n"
f" ({attrs}) as u32,\n"
" &mut *is_none\n"
");\n"
"return true;")
templateValues = {
'jsvalRef': 'rval.handle_mut()',
'successCode': fillDescriptor,
'pre': 'rooted!(in(*cx) let mut rval = UndefinedValue());'
}
# See the similar-looking in CGDOMJSProxyHandler_get for the spec quote.
condition = "id.is_string() || id.is_int()"
if indexedGetter:
condition = f"index.is_none() && ({condition})"
# Once we start supporting OverrideBuiltins we need to make
# ResolveOwnProperty or EnumerateOwnProperties filter out named
# properties that shadow prototype properties.
namedGet = f"""
if {condition} {{
let mut has_on_proto = false;
if !has_property_on_prototype(*cx, proxy_lt, id_lt, &mut has_on_proto) {{
return false;
}}
if !has_on_proto {{
{CGIndenter(CGProxyNamedGetter(self.descriptor, templateValues), 8).define()}
}}
}}
"""
else:
namedGet = ""
return f"""{get}\
rooted!(in(*cx) let mut expando = ptr::null_mut::<JSObject>());
get_expando_object(proxy, expando.handle_mut());
//if (!xpc::WrapperFactory::IsXrayWrapper(proxy) && (expando = GetExpandoObject(proxy))) {{
let proxy_lt = Handle::from_raw(proxy);
let id_lt = Handle::from_raw(id);
if !expando.is_null() {{
rooted!(in(*cx) let mut ignored = ptr::null_mut::<JSObject>());
if !JS_GetPropertyDescriptorById(*cx, expando.handle().into(), id, desc, ignored.handle_mut().into(), is_none) {{
return false;
}}
if !*is_none {{
// Pretend the property lives on the wrapper.
return true;
}}
}}
{namedGet}\
true"""
def definition_body(self):
return CGGeneric(self.getBody())
class CGDOMJSProxyHandler_defineProperty(CGAbstractExternMethod):
def __init__(self, descriptor):
args = [Argument('*mut JSContext', 'cx'), Argument('RawHandleObject', 'proxy'),
Argument('RawHandleId', 'id'),
Argument('RawHandle<PropertyDescriptor>', 'desc'),
Argument('*mut ObjectOpResult', 'opresult')]
CGAbstractExternMethod.__init__(self, descriptor, "defineProperty", "bool", args, templateArgs=['D: DomTypes'])
self.descriptor = descriptor
def getBody(self):
set = "let cx = SafeJSContext::from_ptr(cx);\n"
if self.descriptor.isMaybeCrossOriginObject():
set += dedent(
"""
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::report_cross_origin_denial::<D>(cx, id, "define");
}
// Safe to enter the Realm of proxy now.
let _ac = JSAutoRealm::new(*cx, proxy.get());
""")
indexedSetter = self.descriptor.operations['IndexedSetter']
if indexedSetter:
set += ("let index = get_array_index_from_id(Handle::from_raw(id));\n"
"if let Some(index) = index {\n"
" let this = UnwrapProxy::<D>(proxy);\n"
" let this = &*this;\n"
f"{CGIndenter(CGProxyIndexedSetter(self.descriptor)).define()}"
" return (*opresult).succeed();\n"
"}\n")
elif self.descriptor.operations['IndexedGetter']:
set += ("if get_array_index_from_id(Handle::from_raw(id)).is_some() {\n"
" return (*opresult).failNoIndexedSetter();\n"
"}\n")
namedSetter = self.descriptor.operations['NamedSetter']
if namedSetter:
if self.descriptor.hasLegacyUnforgeableMembers:
raise TypeError("Can't handle a named setter on an interface that has "
"unforgeables. Figure out how that should work!")
set += ("if id.is_string() || id.is_int() {\n"
f"{CGIndenter(CGProxyNamedSetter(self.descriptor)).define()}"
" return (*opresult).succeed();\n"
"}\n")
elif self.descriptor.supportsNamedProperties():
set += ("if id.is_string() || id.is_int() {\n"
f"{CGIndenter(CGProxyNamedGetter(self.descriptor)).define()}"
" if result.is_some() {\n"
" return (*opresult).fail_no_named_setter();\n"
" }\n"
"}\n")
set += f"return proxyhandler::define_property(*cx, {', '.join(a.name for a in self.args[1:])});"
return set
def definition_body(self):
return CGGeneric(self.getBody())
class CGDOMJSProxyHandler_delete(CGAbstractExternMethod):
def __init__(self, descriptor):
args = [Argument('*mut JSContext', 'cx'), Argument('RawHandleObject', 'proxy'),
Argument('RawHandleId', 'id'),
Argument('*mut ObjectOpResult', 'res')]
CGAbstractExternMethod.__init__(self, descriptor, "delete", "bool", args, templateArgs=['D: DomTypes'])
self.descriptor = descriptor
def getBody(self):
set = "let cx = SafeJSContext::from_ptr(cx);\n"
if self.descriptor.isMaybeCrossOriginObject():
set += dedent(
"""
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::report_cross_origin_denial::<D>(cx, id, "delete");
}
// Safe to enter the Realm of proxy now.
let _ac = JSAutoRealm::new(*cx, proxy.get());
""")
if self.descriptor.operations['NamedDeleter']:
if self.descriptor.hasLegacyUnforgeableMembers:
raise TypeError("Can't handle a deleter on an interface that has "
"unforgeables. Figure out how that should work!")
set += CGProxyNamedDeleter(self.descriptor).define()
set += f"return proxyhandler::delete(*cx, {', '.join(a.name for a in self.args[1:])});"
return set
def definition_body(self):
return CGGeneric(self.getBody())
class CGDOMJSProxyHandler_ownPropertyKeys(CGAbstractExternMethod):
def __init__(self, descriptor):
args = [Argument('*mut JSContext', 'cx'),
Argument('RawHandleObject', 'proxy'),
Argument('RawMutableHandleIdVector', 'props')]
CGAbstractExternMethod.__init__(self, descriptor, "own_property_keys", "bool", args,
templateArgs=['D: DomTypes'])
self.descriptor = descriptor
def getBody(self):
body = dedent(
"""
let cx = SafeJSContext::from_ptr(cx);
let unwrapped_proxy = UnwrapProxy::<D>(proxy);
""")
if self.descriptor.isMaybeCrossOriginObject():
body += dedent(
"""
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::cross_origin_own_property_keys(
cx, proxy, CROSS_ORIGIN_PROPERTIES.get(), props
);
}
// Safe to enter the Realm of proxy now.
let _ac = JSAutoRealm::new(*cx, proxy.get());
""")
if self.descriptor.operations['IndexedGetter']:
body += dedent(
"""
for i in 0..(*unwrapped_proxy).Length() {
rooted!(in(*cx) let mut rooted_jsid: jsid);
int_to_jsid(i as i32, rooted_jsid.handle_mut());
AppendToIdVector(props, rooted_jsid.handle());
}
""")
if self.descriptor.supportsNamedProperties():
body += dedent(
"""
for name in (*unwrapped_proxy).SupportedPropertyNames() {
let cstring = CString::new(name).unwrap();
let jsstring = JS_AtomizeAndPinString(*cx, cstring.as_ptr());
rooted!(in(*cx) let rooted = jsstring);
rooted!(in(*cx) let mut rooted_jsid: jsid);
RUST_INTERNED_STRING_TO_JSID(*cx, rooted.handle().get(), rooted_jsid.handle_mut());
AppendToIdVector(props, rooted_jsid.handle());
}
""")
body += dedent(
"""
rooted!(in(*cx) let mut expando = ptr::null_mut::<JSObject>());
get_expando_object(proxy, expando.handle_mut());
if !expando.is_null() &&
!GetPropertyKeys(*cx, expando.handle(), JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS, props) {
return false;
}
true
""")
return body
def definition_body(self):
return CGGeneric(self.getBody())
class CGDOMJSProxyHandler_getOwnEnumerablePropertyKeys(CGAbstractExternMethod):
def __init__(self, descriptor):
assert (descriptor.operations["IndexedGetter"]
and descriptor.interface.getExtendedAttribute("LegacyUnenumerableNamedProperties")
or descriptor.isMaybeCrossOriginObject())
args = [Argument('*mut JSContext', 'cx'),
Argument('RawHandleObject', 'proxy'),
Argument('RawMutableHandleIdVector', 'props')]
CGAbstractExternMethod.__init__(self, descriptor,
"getOwnEnumerablePropertyKeys", "bool", args, templateArgs=['D: DomTypes'])
self.descriptor = descriptor
def getBody(self):
body = dedent(
"""
let cx = SafeJSContext::from_ptr(cx);
let unwrapped_proxy = UnwrapProxy::<D>(proxy);
""")
if self.descriptor.isMaybeCrossOriginObject():
body += dedent(
"""
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
// There are no enumerable cross-origin props, so we're done.
return true;
}
// Safe to enter the Realm of proxy now.
let _ac = JSAutoRealm::new(*cx, proxy.get());
""")
if self.descriptor.operations['IndexedGetter']:
body += dedent(
"""
for i in 0..(*unwrapped_proxy).Length() {
rooted!(in(*cx) let mut rooted_jsid: jsid);
int_to_jsid(i as i32, rooted_jsid.handle_mut());
AppendToIdVector(props, rooted_jsid.handle());
}
""")
body += dedent(
"""
rooted!(in(*cx) let mut expando = ptr::null_mut::<JSObject>());
get_expando_object(proxy, expando.handle_mut());
if !expando.is_null() &&
!GetPropertyKeys(*cx, expando.handle(), JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS, props) {
return false;
}
true
""")
return body
def definition_body(self):
return CGGeneric(self.getBody())
class CGDOMJSProxyHandler_hasOwn(CGAbstractExternMethod):
def __init__(self, descriptor):
args = [Argument('*mut JSContext', 'cx'), Argument('RawHandleObject', 'proxy'),
Argument('RawHandleId', 'id'), Argument('*mut bool', 'bp')]
CGAbstractExternMethod.__init__(self, descriptor, "hasOwn", "bool", args, templateArgs=['D: DomTypes'])
self.descriptor = descriptor
def getBody(self):
indexedGetter = self.descriptor.operations['IndexedGetter']
indexed = "let cx = SafeJSContext::from_ptr(cx);\n"
if self.descriptor.isMaybeCrossOriginObject():
indexed += dedent(
"""
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::cross_origin_has_own(
cx, proxy, CROSS_ORIGIN_PROPERTIES.get(), id, bp
);
}
// Safe to enter the Realm of proxy now.
let _ac = JSAutoRealm::new(*cx, proxy.get());
""")
if indexedGetter:
indexed += ("let index = get_array_index_from_id(Handle::from_raw(id));\n"
"if let Some(index) = index {\n"
" let this = UnwrapProxy::<D>(proxy);\n"
" let this = &*this;\n"
f"{CGIndenter(CGProxyIndexedGetter(self.descriptor)).define()}\n"
" *bp = result.is_some();\n"
" return true;\n"
"}\n\n")
condition = "id.is_string() || id.is_int()"
if indexedGetter:
condition = f"index.is_none() && ({condition})"
if self.descriptor.supportsNamedProperties():
named = f"""
if {condition} {{
let mut has_on_proto = false;
if !has_property_on_prototype(*cx, proxy_lt, id_lt, &mut has_on_proto) {{
return false;
}}
if !has_on_proto {{
{CGIndenter(CGProxyNamedGetter(self.descriptor), 8).define()}
*bp = result.is_some();
return true;
}}
}}
"""
else:
named = ""
return f"""{indexed}\
rooted!(in(*cx) let mut expando = ptr::null_mut::<JSObject>());
let proxy_lt = Handle::from_raw(proxy);
let id_lt = Handle::from_raw(id);
get_expando_object(proxy, expando.handle_mut());
if !expando.is_null() {{
let ok = JS_HasPropertyById(*cx, expando.handle().into(), id, bp);
if !ok || *bp {{
return ok;
}}
}}
{named}\
*bp = false;
true"""
def definition_body(self):
return CGGeneric(self.getBody())
class CGDOMJSProxyHandler_get(CGAbstractExternMethod):
def __init__(self, descriptor):
args = [Argument('*mut JSContext', 'cx'), Argument('RawHandleObject', 'proxy'),
Argument('RawHandleValue', 'receiver'), Argument('RawHandleId', 'id'),
Argument('RawMutableHandleValue', 'vp')]
CGAbstractExternMethod.__init__(self, descriptor, "get", "bool", args, templateArgs=['D: DomTypes'])
self.descriptor = descriptor
# https://heycam.github.io/webidl/#LegacyPlatformObjectGetOwnProperty
def getBody(self):
if self.descriptor.isMaybeCrossOriginObject():
maybeCrossOriginGet = dedent(
"""
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::cross_origin_get::<D>(cx, proxy, receiver, id, vp);
}
// Safe to enter the Realm of proxy now.
let _ac = JSAutoRealm::new(*cx, proxy.get());
""")
else:
maybeCrossOriginGet = ""
getFromExpando = """\
rooted!(in(*cx) let mut expando = ptr::null_mut::<JSObject>());
get_expando_object(proxy, expando.handle_mut());
if !expando.is_null() {
let mut hasProp = false;
if !JS_HasPropertyById(*cx, expando.handle().into(), id, &mut hasProp) {
return false;
}
if hasProp {
return JS_ForwardGetPropertyTo(*cx, expando.handle().into(), id, receiver, vp);
}
}"""
templateValues = {
'jsvalRef': 'vp_lt',
'successCode': 'return true;',
}
indexedGetter = self.descriptor.operations['IndexedGetter']
if indexedGetter:
getIndexedOrExpando = ("let index = get_array_index_from_id(id_lt);\n"
"if let Some(index) = index {\n"
" let this = UnwrapProxy::<D>(proxy);\n"
" let this = &*this;\n"
f"{CGIndenter(CGProxyIndexedGetter(self.descriptor, templateValues)).define()}")
trimmedGetFromExpando = stripTrailingWhitespace(getFromExpando.replace('\n', '\n '))
getIndexedOrExpando += f"""
// Even if we don't have this index, we don't forward the
// get on to our expando object.
}} else {{
{trimmedGetFromExpando}
}}
"""
else:
getIndexedOrExpando = f"{getFromExpando}\n"
if self.descriptor.supportsNamedProperties():
condition = "id.is_string() || id.is_int()"
# From step 1:
# If O supports indexed properties and P is an array index, then:
#
# 3. Set ignoreNamedProps to true.
if indexedGetter:
condition = f"index.is_none() && ({condition})"
getNamed = (f"if {condition} {{\n"
f"{CGIndenter(CGProxyNamedGetter(self.descriptor, templateValues)).define()}}}\n")
else:
getNamed = ""
return f"""
//MOZ_ASSERT(!xpc::WrapperFactory::IsXrayWrapper(proxy),
//"Should not have a XrayWrapper here");
let cx = SafeJSContext::from_ptr(cx);
{maybeCrossOriginGet}
let proxy_lt = Handle::from_raw(proxy);
let mut vp_lt = MutableHandle::from_raw(vp);
let id_lt = Handle::from_raw(id);
let receiver_lt = Handle::from_raw(receiver);
{getIndexedOrExpando}
let mut found = false;
if !get_property_on_prototype(*cx, proxy_lt, receiver_lt, id_lt, &mut found, vp_lt.reborrow()) {{
return false;
}}
if found {{
return true;
}}
{getNamed}
vp.set(UndefinedValue());
true"""
def definition_body(self):
return CGGeneric(self.getBody())
class CGDOMJSProxyHandler_getPrototype(CGAbstractExternMethod):
def __init__(self, descriptor):
args = [Argument('*mut JSContext', 'cx'), Argument('RawHandleObject', 'proxy'),
Argument('RawMutableHandleObject', 'proto')]
CGAbstractExternMethod.__init__(self, descriptor, "getPrototype", "bool", args, templateArgs=["D: DomTypes"])
assert descriptor.isMaybeCrossOriginObject()
self.descriptor = descriptor
def getBody(self):
return dedent(
"""
let cx = SafeJSContext::from_ptr(cx);
proxyhandler::maybe_cross_origin_get_prototype::<D>(cx, proxy, GetProtoObject::<D>, proto)
""")
def definition_body(self):
return CGGeneric(self.getBody())
class CGDOMJSProxyHandler_className(CGAbstractExternMethod):
def __init__(self, descriptor):
args = [Argument('*mut JSContext', 'cx'), Argument('RawHandleObject', '_proxy')]
CGAbstractExternMethod.__init__(self, descriptor, "className", "*const libc::c_char", args, doesNotPanic=True)
self.descriptor = descriptor
def getBody(self):
return str_to_cstr_ptr(self.descriptor.name)
def definition_body(self):
return CGGeneric(self.getBody())
class CGAbstractClassHook(CGAbstractExternMethod):
"""
Meant for implementing JSClass hooks, like Finalize or Trace. Does very raw
'this' unwrapping as it assumes that the unwrapped type is always known.
"""
def __init__(self, descriptor, name, returnType, args, doesNotPanic=False):
CGAbstractExternMethod.__init__(self, descriptor, name, returnType,
args, templateArgs=['D: DomTypes'])
def definition_body_prologue(self):
return CGGeneric(f"""
let this = native_from_object_static::<{self.descriptor.concreteType}>(obj).unwrap();
""")
def definition_body(self):
return CGList([
self.definition_body_prologue(),
self.generate_code(),
])
def generate_code(self):
raise NotImplementedError # Override me!
def finalizeHook(descriptor, hookName, context):
if descriptor.isGlobal():
release = "finalize_global(obj, this);"
elif descriptor.weakReferenceable:
release = "finalize_weak_referenceable(obj, this);"
else:
release = "finalize_common(this);"
return release
class CGClassTraceHook(CGAbstractClassHook):
"""
A hook to trace through our native object; used for GC and CC
"""
def __init__(self, descriptor):
args = [Argument('*mut JSTracer', 'trc'), Argument('*mut JSObject', 'obj')]
CGAbstractClassHook.__init__(self, descriptor, TRACE_HOOK_NAME, 'void',
args, doesNotPanic=True)
self.traceGlobal = descriptor.isGlobal()
def generate_code(self):
body = [CGGeneric("if this.is_null() { return; } // GC during obj creation\n"
f"(*this).trace({self.args[0].name});")]
if self.traceGlobal:
body += [CGGeneric("trace_global(trc, obj);")]
return CGList(body, "\n")
class CGClassConstructHook(CGAbstractExternMethod):
"""
JS-visible constructor for our objects
"""
def __init__(self, descriptor, constructor=None):
args = [Argument('*mut JSContext', 'cx'), Argument('u32', 'argc'), Argument('*mut JSVal', 'vp')]
name = CONSTRUCT_HOOK_NAME
if constructor:
name += f"_{constructor.identifier.name}"
else:
constructor = descriptor.interface.ctor()
assert constructor
CGAbstractExternMethod.__init__(self, descriptor, name, 'bool', args, templateArgs=['D: DomTypes'])
self.constructor = constructor
self.exposureSet = descriptor.interface.exposureSet
def definition_body(self):
preamble = """let cx = SafeJSContext::from_ptr(cx);
let args = CallArgs::from_vp(vp, argc);
let global = D::GlobalScope::from_object(JS_CALLEE(*cx, vp).to_object());
"""
if self.constructor.isHTMLConstructor():
signatures = self.constructor.signatures()
assert len(signatures) == 1
constructorCall = f"""
<D as DomHelpers<D>>::call_html_constructor::<D::{self.descriptor.name}>(
cx,
&args,
&global,
PrototypeList::ID::{MakeNativeName(self.descriptor.name)},
CreateInterfaceObjects::<D>,
CanGc::note()
)
"""
else:
ctorName = GetConstructorNameForReporting(self.descriptor, self.constructor)
name = self.constructor.identifier.name
nativeName = MakeNativeName(self.descriptor.binaryNameFor(name))
if len(self.exposureSet) == 1:
args = [
f"global.downcast::<D::{list(self.exposureSet)[0]}>().unwrap()",
"Some(desired_proto)",
"CanGc::note()"
]
else:
args = [
"global",
"Some(desired_proto)",
"CanGc::note()"
]
constructor = CGMethodCall(args, nativeName, True, self.descriptor, self.constructor)
constructorCall = f"""
call_default_constructor::<D>(
cx,
&args,
&global,
PrototypeList::ID::{MakeNativeName(self.descriptor.name)},
\"{ctorName}\",
CreateInterfaceObjects::<D>,
|cx: SafeJSContext, args: &CallArgs, global: &D::GlobalScope, desired_proto: HandleObject| {{
{constructor.define()}
}}
)
"""
return CGList([CGGeneric(preamble), CGGeneric(constructorCall)])
class CGClassFinalizeHook(CGAbstractClassHook):
"""
A hook for finalize, used to release our native object.
"""
def __init__(self, descriptor):
args = [Argument('*mut GCContext', '_cx'), Argument('*mut JSObject', 'obj')]
CGAbstractClassHook.__init__(self, descriptor, FINALIZE_HOOK_NAME,
'void', args)
def generate_code(self):
return CGGeneric(finalizeHook(self.descriptor, self.name, self.args[0].name))
class CGDOMJSProxyHandlerDOMClass(CGThing):
def __init__(self, descriptor):
CGThing.__init__(self)
self.descriptor = descriptor
def define(self):
return f"""
pub static Class: ThreadUnsafeOnceLock<DOMClass> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_proxy_handler_dom_class<D: DomTypes>() {{
Class.set({DOMClass(self.descriptor)});
}}
"""
class CGInterfaceTrait(CGThing):
def __init__(self, descriptor, descriptorProvider):
CGThing.__init__(self)
def attribute_arguments(attribute_type, argument=None, inRealm=False, canGc=False, retval=False):
if typeNeedsCx(attribute_type, retval):
yield "cx", "SafeJSContext"
if argument:
yield "value", argument_type(descriptor, argument)
if inRealm:
yield "_comp", "InRealm"
if canGc:
yield "_can_gc", "CanGc"
if retval and returnTypeNeedsOutparam(attribute_type):
yield "retval", outparamTypeFromReturnType(attribute_type)
def members():
for m in descriptor.interface.members:
if (m.isMethod()
and not m.isMaplikeOrSetlikeOrIterableMethod()
and (not m.isIdentifierLess() or (m.isStringifier() and not m.underlyingAttr))
and not m.isDefaultToJSON()):
name = CGSpecializedMethod.makeNativeName(descriptor, m)
infallible = 'infallible' in descriptor.getExtendedAttributes(m)
for idx, (rettype, arguments) in enumerate(m.signatures()):
arguments = method_arguments(descriptor, rettype, arguments,
inRealm=name in descriptor.inRealmMethods,
canGc=name in descriptor.canGcMethods)
rettype = return_type(descriptor, rettype, infallible)
yield f"{name}{'_' * idx}", arguments, rettype, m.isStatic()
elif m.isAttr():
name = CGSpecializedGetter.makeNativeName(descriptor, m)
infallible = 'infallible' in descriptor.getExtendedAttributes(m, getter=True)
yield (name,
attribute_arguments(
m.type,
inRealm=name in descriptor.inRealmMethods,
canGc=name in descriptor.canGcMethods,
retval=True
),
return_type(descriptor, m.type, infallible),
m.isStatic())
if not m.readonly:
name = CGSpecializedSetter.makeNativeName(descriptor, m)
infallible = 'infallible' in descriptor.getExtendedAttributes(m, setter=True)
if infallible:
rettype = "()"
else:
rettype = "ErrorResult"
yield (name,
attribute_arguments(
m.type,
m.type,
inRealm=name in descriptor.inRealmMethods,
canGc=name in descriptor.canGcMethods,
retval=False,
),
rettype,
m.isStatic())
if descriptor.proxy or descriptor.isGlobal():
for name, operation in descriptor.operations.items():
if not operation or operation.isStringifier():
continue
assert len(operation.signatures()) == 1
rettype, arguments = operation.signatures()[0]
infallible = 'infallible' in descriptor.getExtendedAttributes(operation)
if operation.isGetter():
if not rettype.nullable():
rettype = IDLNullableType(rettype.location, rettype)
arguments = method_arguments(descriptor, rettype, arguments,
inRealm=name in descriptor.inRealmMethods,
canGc=name in descriptor.canGcMethods)
# If this interface 'supports named properties', then we
# should be able to access 'supported property names'
#
# WebIDL, Second Draft, section 3.2.4.5
# https://heycam.github.io/webidl/#idl-named-properties
if operation.isNamed():
yield "SupportedPropertyNames", [], "Vec<DOMString>", False
else:
arguments = method_arguments(descriptor, rettype, arguments,
inRealm=name in descriptor.inRealmMethods,
canGc=name in descriptor.canGcMethods)
rettype = return_type(descriptor, rettype, infallible)
yield name, arguments, rettype, False
def fmt(arguments, leadingComma=True):
keywords = {"async"}
prefix = "" if not leadingComma else ", "
return prefix + ", ".join(
f"{name if name not in keywords else f'r#{name}'}: {type_}"
for name, type_ in arguments
)
def contains_unsafe_arg(arguments):
if not arguments or len(arguments) == 0:
return False
return functools.reduce((lambda x, y: x or y[1] == '*mut JSContext'), arguments, False)
methods = []
exposureSet = list(descriptor.interface.exposureSet)
exposedGlobal = "GlobalScope" if len(exposureSet) > 1 else exposureSet[0]
hasLength = False
for name, arguments, rettype, isStatic in members():
if name == "Length":
hasLength = True
arguments = list(arguments)
unsafe = 'unsafe ' if contains_unsafe_arg(arguments) else ''
returnType = f" -> {rettype}" if rettype != '()' else ''
selfArg = "&self" if not isStatic else ""
extra = [("global", f"&D::{exposedGlobal}")] if isStatic else []
if arguments and arguments[0][0] == "cx":
arguments = [arguments[0]] + extra + arguments[1:]
else:
arguments = extra + arguments
methods.append(CGGeneric(
f"{unsafe}fn {name}({selfArg}"
f"{fmt(arguments, leadingComma=not isStatic)}){returnType};\n"
))
def ctorMethod(ctor, baseName=None):
infallible = 'infallible' in descriptor.getExtendedAttributes(ctor)
for (i, (rettype, arguments)) in enumerate(ctor.signatures()):
name = (baseName or ctor.identifier.name) + ('_' * i)
args = list(method_arguments(descriptor, rettype, arguments))
extra = [
("global", f"&D::{exposedGlobal}"),
("proto", "Option<HandleObject>"),
("can_gc", "CanGc"),
]
if args and args[0][0] == "cx":
args = [args[0]] + extra + args[1:]
else:
args = extra + args
yield CGGeneric(
f"fn {name}({fmt(args, leadingComma=False)}) -> "
f"{return_type(descriptorProvider, rettype, infallible)};\n"
)
ctor = descriptor.interface.ctor()
if ctor and not ctor.isHTMLConstructor():
methods.extend(list(ctorMethod(ctor, "Constructor")))
for ctor in descriptor.interface.legacyFactoryFunctions:
methods.extend(list(ctorMethod(ctor)))
if descriptor.operations['IndexedGetter'] and not hasLength:
methods.append(CGGeneric("fn Length(&self) -> u32;\n"))
name = descriptor.interface.identifier.name
self.cgRoot = CGWrapper(CGIndenter(CGList(methods, "")),
pre=f"pub trait {name}Methods<D: DomTypes> {{\n",
post="}")
self.empty = not methods
def define(self):
return self.cgRoot.define()
class CGWeakReferenceableTrait(CGThing):
def __init__(self, descriptor):
CGThing.__init__(self)
assert descriptor.weakReferenceable
self.code = f"impl WeakReferenceable for {descriptor.interface.identifier.name} {{}}"
def define(self):
return self.code
class CGInitStatics(CGThing):
def __init__(self, descriptor):
CGThing.__init__(self)
def internal(method):
return descriptor.internalNameFor(method.identifier.name)
properties = PropertyArrays(descriptor)
all_names = PropertyArrays.arrayNames()
arrays = [getattr(properties, name) for name in all_names]
nonempty = map(lambda x: x.variableName(), filter(lambda x: x.length() != 0, arrays))
specs = [[
f'init_{name}_specs::<D>();',
f'init_{name}_prefs::<D>();',
] for name in nonempty]
flat_specs = [x for xs in specs for x in xs]
specs = '\n'.join(flat_specs)
module = f"crate::codegen::GenericBindings::{toBindingPath(descriptor)}"
relevantMethods = [
m for m in descriptor.interface.members if m.isMethod()
] if not descriptor.interface.isCallback() else []
allOperations = descriptor.operations.keys()
relevantOperations = list(map(lambda x: f"__{x.lower()}", filter(lambda o: o != "Stringifier", allOperations)))
relevantMethods = filter(
lambda m: internal(m) not in relevantOperations,
relevantMethods,
)
relevantMethods = filter(
lambda x: (
not x.isStatic()
or any([r.isPromise() for r, _ in x.signatures()])
),
relevantMethods
)
methods = [f'{module}::init_{internal(m)}_methodinfo::<D>();' for m in relevantMethods]
getters = [
f'init_{internal(m)}_getterinfo::<D>();'
for m in descriptor.interface.members if m.isAttr() and not m.isStatic()
]
setters = [
f'init_{internal(m)}_setterinfo::<D>();'
for m in descriptor.interface.members
if m.isAttr() and (
not m.readonly
or m.getExtendedAttribute("PutForwards")
or m.getExtendedAttribute("Replaceable")
) and not m.isStatic()
]
methods = '\n'.join(methods)
getters = '\n'.join(getters)
setters = '\n'.join(setters)
crossorigin = [
"init_sCrossOriginMethods::<D>();",
"init_sCrossOriginAttributes::<D>();",
"init_cross_origin_properties::<D>();"
] if descriptor.isMaybeCrossOriginObject() else []
crossorigin_joined = '\n'.join(crossorigin)
interface = (
"init_interface_object::<D>();"
if descriptor.interface.hasInterfaceObject()
and not descriptor.interface.isNamespace()
and not descriptor.interface.isCallback()
and not descriptor.interface.getExtendedAttribute("Inline")
else ""
)
nonproxy = (
"init_domjs_class::<D>();"
if not descriptor.proxy
and descriptor.concrete
else ""
)
self.code = f"""
pub(crate) fn init_statics<D: DomTypes>() {{
{interface}
{nonproxy}
{methods}
{getters}
{setters}
{crossorigin_joined}
{specs}
}}
"""
def define(self):
return self.code
class CGDescriptor(CGThing):
def __init__(self, descriptor, config, soleDescriptor):
CGThing.__init__(self)
assert not descriptor.concrete or not descriptor.interface.isCallback()
reexports = []
def reexportedName(name):
if name.startswith(descriptor.name):
return name
if not soleDescriptor:
return f'{name} as {descriptor.name}{name}'
return name
cgThings = []
defaultToJSONMethod = None
unscopableNames = []
for m in descriptor.interface.members:
if (m.isMethod()
and (not m.isIdentifierLess() or m == descriptor.operations["Stringifier"])):
if m.getExtendedAttribute("Unscopable"):
assert not m.isStatic()
unscopableNames.append(m.identifier.name)
if m.isDefaultToJSON():
defaultToJSONMethod = m
elif m.isStatic():
assert descriptor.interface.hasInterfaceObject()
cgThings.append(CGStaticMethod(descriptor, m))
if m.returnsPromise():
cgThings.append(CGStaticMethodJitinfo(m))
elif not descriptor.interface.isCallback():
cgThings.append(CGSpecializedMethod(descriptor, m))
if m.returnsPromise():
cgThings.append(
CGMethodPromiseWrapper(descriptor, m)
)
cgThings.append(CGMemberJITInfo(descriptor, m))
elif m.isAttr():
if m.getExtendedAttribute("Unscopable"):
assert not m.isStatic()
unscopableNames.append(m.identifier.name)
if m.isStatic():
assert descriptor.interface.hasInterfaceObject()
cgThings.append(CGStaticGetter(descriptor, m))
elif not descriptor.interface.isCallback():
cgThings.append(CGSpecializedGetter(descriptor, m))
if m.type.isPromise():
cgThings.append(
CGGetterPromiseWrapper(descriptor, m)
)
if not m.readonly:
if m.isStatic():
assert descriptor.interface.hasInterfaceObject()
cgThings.append(CGStaticSetter(descriptor, m))
elif not descriptor.interface.isCallback():
cgThings.append(CGSpecializedSetter(descriptor, m))
elif m.getExtendedAttribute("PutForwards"):
cgThings.append(CGSpecializedForwardingSetter(descriptor, m))
elif m.getExtendedAttribute("Replaceable"):
cgThings.append(CGSpecializedReplaceableSetter(descriptor, m))
if (not m.isStatic() and not descriptor.interface.isCallback()):
cgThings.append(CGMemberJITInfo(descriptor, m))
if defaultToJSONMethod:
cgThings.append(CGDefaultToJSONMethod(descriptor, defaultToJSONMethod))
cgThings.append(CGMemberJITInfo(descriptor, defaultToJSONMethod))
if descriptor.concrete:
cgThings.append(CGClassFinalizeHook(descriptor))
cgThings.append(CGClassTraceHook(descriptor))
# If there are no constant members, don't make a module for constants
constMembers = [CGConstant(m) for m in descriptor.interface.members if m.isConst()]
if constMembers:
cgThings.append(CGNamespace.build([f"{descriptor.name}Constants"],
CGIndenter(CGList(constMembers)),
public=True))
reexports.append(f'{descriptor.name}Constants')
if descriptor.proxy:
cgThings.append(CGDefineProxyHandler(descriptor))
if descriptor.isMaybeCrossOriginObject():
cgThings.append(CGCrossOriginProperties(descriptor))
properties = PropertyArrays(descriptor)
if defaultToJSONMethod:
cgThings.append(CGCollectJSONAttributesMethod(descriptor, defaultToJSONMethod))
if descriptor.concrete:
if descriptor.proxy:
# cgThings.append(CGProxyIsProxy(descriptor))
cgThings.append(CGProxyUnwrap(descriptor))
cgThings.append(CGDOMJSProxyHandlerDOMClass(descriptor))
cgThings.append(CGDOMJSProxyHandler_ownPropertyKeys(descriptor))
if descriptor.interface.getExtendedAttribute("LegacyUnenumerableNamedProperties") or \
descriptor.isMaybeCrossOriginObject():
cgThings.append(CGDOMJSProxyHandler_getOwnEnumerablePropertyKeys(descriptor))
cgThings.append(CGDOMJSProxyHandler_getOwnPropertyDescriptor(descriptor))
cgThings.append(CGDOMJSProxyHandler_className(descriptor))
cgThings.append(CGDOMJSProxyHandler_get(descriptor))
cgThings.append(CGDOMJSProxyHandler_hasOwn(descriptor))
if descriptor.isMaybeCrossOriginObject() or descriptor.operations['IndexedSetter'] or \
descriptor.operations['NamedSetter']:
cgThings.append(CGDOMJSProxyHandler_defineProperty(descriptor))
# We want to prevent indexed deleters from compiling at all.
assert not descriptor.operations['IndexedDeleter']
if descriptor.isMaybeCrossOriginObject() or descriptor.operations['NamedDeleter']:
cgThings.append(CGDOMJSProxyHandler_delete(descriptor))
if descriptor.isMaybeCrossOriginObject():
cgThings.append(CGDOMJSProxyHandler_getPrototype(descriptor))
# cgThings.append(CGDOMJSProxyHandler(descriptor))
# cgThings.append(CGIsMethod(descriptor))
pass
else:
cgThings.append(CGDOMJSClass(descriptor))
if descriptor.isGlobal():
cgThings.append(CGWrapGlobalMethod(descriptor, properties))
else:
cgThings.append(CGWrapMethod(descriptor))
reexports.append('Wrap')
haveUnscopables = False
if not descriptor.interface.isCallback() and not descriptor.interface.isNamespace():
if unscopableNames:
haveUnscopables = True
cgThings.append(
CGList([CGGeneric("const unscopable_names: &[&std::ffi::CStr] = &["),
CGIndenter(CGList([CGGeneric(str_to_cstr(name)) for
name in unscopableNames], ",\n")),
CGGeneric("];\n")], "\n"))
if not descriptor.interface.isCallback():
interfaceTrait = CGInterfaceTrait(descriptor, config.getDescriptorProvider())
cgThings.append(interfaceTrait)
if not interfaceTrait.empty:
reexports.append(f'{descriptor.name}Methods')
legacyWindowAliases = descriptor.interface.legacyWindowAliases
haveLegacyWindowAliases = len(legacyWindowAliases) != 0
if haveLegacyWindowAliases:
cgThings.append(
CGList([CGGeneric("const legacy_window_aliases: &[&std::ffi::CStr] = &["),
CGIndenter(CGList([CGGeneric(str_to_cstr(name)) for
name in legacyWindowAliases], ",\n")),
CGGeneric("];\n")], "\n"))
cgThings.append(CGGeneric(str(properties)))
if not descriptor.interface.getExtendedAttribute("Inline"):
if not descriptor.interface.isCallback() and not descriptor.interface.isNamespace():
cgThings.append(CGGetProtoObjectMethod(descriptor))
reexports.append('GetProtoObject')
cgThings.append(CGPrototypeJSClass(descriptor))
if descriptor.interface.hasInterfaceObject():
if descriptor.interface.ctor():
cgThings.append(CGClassConstructHook(descriptor))
for ctor in descriptor.interface.legacyFactoryFunctions:
cgThings.append(CGClassConstructHook(descriptor, ctor))
if not descriptor.interface.isCallback():
cgThings.append(CGInterfaceObjectJSClass(descriptor))
if descriptor.shouldHaveGetConstructorObjectMethod():
cgThings.append(CGGetConstructorObjectMethod(descriptor))
reexports.append('GetConstructorObject')
if descriptor.register:
cgThings.append(CGDefineDOMInterfaceMethod(descriptor))
reexports.append('DefineDOMInterface')
cgThings.append(CGConstructorEnabled(descriptor))
cgThings.append(CGCreateInterfaceObjectsMethod(descriptor, properties, haveUnscopables,
haveLegacyWindowAliases))
cgThings.append(CGInitStatics(descriptor))
cgThings = CGList(cgThings, '\n')
# Add imports
# These are inside the generated module
cgThings = CGImports(cgThings, descriptors=[descriptor], callbacks=[],
dictionaries=[], enums=[], typedefs=[], imports=[
'crate::import::module::*',
], config=config)
cgThings = CGWrapper(CGNamespace(toBindingNamespace(descriptor.name),
cgThings, public=True),
post='\n')
if reexports:
reexports = ', '.join([reexportedName(name) for name in reexports])
namespace = toBindingNamespace(descriptor.name)
cgThings = CGList([CGGeneric(f'pub use self::{namespace}::{{{reexports}}};'),
cgThings], '\n')
self.cgRoot = cgThings
def define(self):
return self.cgRoot.define()
class CGNonNamespacedEnum(CGThing):
def __init__(self, enumName, names, first, comment="", deriving="", repr=""):
# Account for first value
entries = [f"{names[0]} = {first}"] + names[1:]
# Append a Last.
entries.append(f'#[allow(dead_code)] Last = {first + len(entries)}')
# Indent.
entries = [f' {e}' for e in entries]
# Build the enum body.
joinedEntries = ',\n'.join(entries)
enumstr = f"{comment}pub enum {enumName} {{\n{joinedEntries}\n}}\n"
if repr:
enumstr = f"#[repr({repr})]\n{enumstr}"
if deriving:
enumstr = f"#[derive({deriving})]\n{enumstr}"
curr = CGGeneric(enumstr)
# Add some whitespace padding.
curr = CGWrapper(curr, pre='\n', post='\n')
# Add the typedef
# typedef = '\ntypedef %s::%s %s;\n\n' % (namespace, enumName, enumName)
# curr = CGList([curr, CGGeneric(typedef)])
# Save the result.
self.node = curr
def define(self):
return self.node.define()
class CGDictionary(CGThing):
def __init__(self, dictionary, descriptorProvider, config):
self.dictionary = dictionary
derivesList = config.getDictConfig(dictionary.identifier.name).get('derives', [])
self.manualImpls = list(filter(lambda t: traitRequiresManualImpl(t, self.dictionary), derivesList))
self.derives = list(filter(lambda t: not traitRequiresManualImpl(t, self.dictionary), derivesList))
if all(CGDictionary(d, descriptorProvider, config).generatable for
d in CGDictionary.getDictionaryDependencies(dictionary)):
self.generatable = True
else:
self.generatable = False
# Nothing else to do here
return
self.generic, self.genericSuffix = genericsForType(self.dictionary)
self.memberInfo = [
(member,
getJSToNativeConversionInfo(member.type,
descriptorProvider,
isMember="Dictionary",
defaultValue=member.defaultValue,
exceptionCode="return Err(());\n"))
for member in dictionary.members]
def define(self):
if not self.generatable:
return ""
return f"{self.struct()}\n{self.impl()}"
def manualImplClone(self):
members = []
for m in self.memberInfo:
memberName = self.makeMemberName(m[0].identifier.name)
members += [f" {memberName}: self.{memberName}.clone(),"]
if self.dictionary.parent:
members += [" parent: parent.clone(),"]
members = "\n".join(members)
return f"""
#[allow(clippy::clone_on_copy)]
impl{self.generic} Clone for {self.makeClassName(self.dictionary)}{self.genericSuffix} {{
fn clone(&self) -> Self {{
Self {{
{members}
}}
}}
}}
"""
def manualImpl(self, t):
if t == "Clone":
return self.manualImplClone()
raise f"Don't know how to impl {t} for dicts."
def struct(self):
d = self.dictionary
if d.parent:
typeName = f"{self.makeModuleName(d.parent)}::{self.makeClassName(d.parent)}"
_, parentSuffix = genericsForType(d.parent)
typeName += parentSuffix
if type_needs_tracing(d.parent):
typeName = f"RootedTraceableBox<{typeName}>"
inheritance = f" pub parent: {typeName},\n"
else:
inheritance = ""
memberDecls = [f" pub {self.makeMemberName(m[0].identifier.name)}: {self.getMemberType(m)},"
for m in self.memberInfo]
derive = ["JSTraceable"] + self.derives
default = ""
mustRoot = ""
if self.membersNeedTracing():
mustRoot = "#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]\n"
# We can't unconditionally derive Default here, because union types can have unique
# default values provided for each usage. Instead, whenever possible we re-use the empty()
# method that is generated.
if not self.hasRequiredFields(self.dictionary):
if d.parent:
inheritanceDefault = " parent: Default::default(),\n"
else:
inheritanceDefault = ""
if not self.membersNeedTracing():
impl = " Self::empty()\n"
else:
memberDefaults = [f" {self.makeMemberName(m[0].identifier.name)}: Default::default(),"
for m in self.memberInfo]
joinedDefaults = '\n'.join(memberDefaults)
impl = (
" Self {\n"
f" {inheritanceDefault}{joinedDefaults}"
" }\n"
)
default = (
f"impl{self.generic} Default for {self.makeClassName(d)}{self.genericSuffix} {{\n"
" fn default() -> Self {\n"
f"{impl}"
" }\n"
"}\n"
)
manualImpls = "\n".join(map(lambda t: self.manualImpl(t), self.manualImpls))
joinedMemberDecls = '\n'.join(memberDecls)
return (
f"#[derive({', '.join(derive)})]\n"
f"{mustRoot}"
f"pub struct {self.makeClassName(d)}{self.generic} {{\n"
f"{inheritance}"
f"{joinedMemberDecls}\n"
"}\n"
f"{manualImpls}"
f"{default}"
)
def impl(self):
d = self.dictionary
if d.parent:
initParent = (
"{\n"
f" match {self.makeModuleName(d.parent)}::{self.makeClassName(d.parent)}::new(cx, val)? {{\n"
" ConversionResult::Success(v) => v,\n"
" ConversionResult::Failure(error) => {\n"
" throw_type_error(*cx, &error);\n"
" return Err(());\n"
" }\n"
" }\n"
"}"
)
else:
initParent = ""
def memberInit(memberInfo, isInitial):
member, _ = memberInfo
name = self.makeMemberName(member.identifier.name)
conversion = self.getMemberConversion(memberInfo, member.type)
if isInitial:
return CGGeneric(f"{name}: {conversion.define()},\n")
return CGGeneric(f"dictionary.{name} = {conversion.define()};\n")
def varInsert(varName, dictionaryName):
insertion = (
f"rooted!(in(cx) let mut {varName}_js = UndefinedValue());\n"
f"{varName}.to_jsval(cx, {varName}_js.handle_mut());\n"
f'set_dictionary_property(cx, obj.handle(), "{dictionaryName}", {varName}_js.handle()).unwrap();')
return CGGeneric(insertion)
def memberInsert(memberInfo):
member, _ = memberInfo
name = self.makeMemberName(member.identifier.name)
if member.optional and not member.defaultValue:
insertion = CGIfWrapper(f"let Some(ref {name}) = self.{name}",
varInsert(name, member.identifier.name))
else:
insertion = CGGeneric(f"let {name} = &self.{name};\n"
f"{varInsert(name, member.identifier.name).define()}")
return CGGeneric(f"{insertion.define()}\n")
memberInserts = [memberInsert(m) for m in self.memberInfo]
if d.parent:
memberInserts = [CGGeneric("self.parent.to_jsobject(cx, obj.reborrow());\n")] + memberInserts
selfName = self.makeClassName(d)
if self.membersNeedTracing():
actualType = f"RootedTraceableBox<{selfName}{self.genericSuffix}>"
preInitial = f"let dictionary = RootedTraceableBox::new({selfName} {{\n"
postInitial = "});\n"
else:
actualType = f"{selfName}{self.genericSuffix}"
preInitial = f"let dictionary = {selfName} {{\n"
postInitial = "};\n"
initParent = f"parent: {initParent},\n" if initParent else ""
memberInits = CGList([memberInit(m, True) for m in self.memberInfo])
unsafe_if_necessary = "unsafe"
if not initParent and not memberInits:
unsafe_if_necessary = ""
return (
f"impl{self.generic} {selfName}{self.genericSuffix} {{\n"
f"{CGIndenter(CGGeneric(self.makeEmpty()), indentLevel=4).define()}\n"
" pub fn new(cx: SafeJSContext, val: HandleValue) \n"
f" -> Result<ConversionResult<{actualType}>, ()> {{\n"
f" {unsafe_if_necessary} {{\n"
" let object = if val.get().is_null_or_undefined() {\n"
" ptr::null_mut()\n"
" } else if val.get().is_object() {\n"
" val.get().to_object()\n"
" } else {\n"
" return Ok(ConversionResult::Failure(\"Value is not an object.\".into()));\n"
" };\n"
" rooted!(in(*cx) let object = object);\n"
f"{CGIndenter(CGGeneric(preInitial), indentLevel=8).define()}"
f"{CGIndenter(CGGeneric(initParent), indentLevel=16).define()}"
f"{CGIndenter(memberInits, indentLevel=16).define()}"
f"{CGIndenter(CGGeneric(postInitial), indentLevel=8).define()}"
" Ok(ConversionResult::Success(dictionary))\n"
" }\n"
" }\n"
"}\n"
"\n"
f"impl{self.generic} FromJSValConvertible for {actualType} {{\n"
" type Config = ();\n"
" unsafe fn from_jsval(cx: *mut JSContext, value: HandleValue, _option: ())\n"
f" -> Result<ConversionResult<{actualType}>, ()> {{\n"
f" {selfName}::new(SafeJSContext::from_ptr(cx), value)\n"
" }\n"
"}\n"
"\n"
f"impl{self.generic} {selfName}{self.genericSuffix} {{\n"
" #[allow(clippy::wrong_self_convention)]\n"
" pub unsafe fn to_jsobject(&self, cx: *mut JSContext, mut obj: MutableHandleObject) {\n"
f"{CGIndenter(CGList(memberInserts), indentLevel=8).define()} }}\n"
"}\n"
"\n"
f"impl{self.generic} ToJSValConvertible for {selfName}{self.genericSuffix} {{\n"
" unsafe fn to_jsval(&self, cx: *mut JSContext, mut rval: MutableHandleValue) {\n"
" rooted!(in(cx) let mut obj = JS_NewObject(cx, ptr::null()));\n"
" self.to_jsobject(cx, obj.handle_mut());\n"
" rval.set(ObjectOrNullValue(obj.get()))\n"
" }\n"
"}\n"
)
def membersNeedTracing(self):
return type_needs_tracing(self.dictionary)
@staticmethod
def makeDictionaryName(dictionary):
if isinstance(dictionary, IDLWrapperType):
return CGDictionary.makeDictionaryName(dictionary.inner)
else:
return dictionary.identifier.name
def makeClassName(self, dictionary):
return self.makeDictionaryName(dictionary)
@staticmethod
def makeModuleName(dictionary):
return getModuleFromObject(dictionary)
def getMemberType(self, memberInfo):
member, info = memberInfo
declType = info.declType
if member.optional and not member.defaultValue:
declType = CGWrapper(info.declType, pre="Option<", post=">")
return declType.define()
def getMemberConversion(self, memberInfo, memberType):
def indent(s):
return CGIndenter(CGGeneric(s), 12).define()
member, info = memberInfo
templateBody = info.template
default = info.default
replacements = {"val": "rval.handle()"}
conversion = string.Template(templateBody).substitute(replacements)
assert (member.defaultValue is None) == (default is None)
if not member.optional:
assert default is None
default = (f'throw_type_error(*cx, "Missing required member \\"{member.identifier.name}\\".");\n'
"return Err(());")
elif not default:
default = "None"
conversion = f"Some({conversion})"
conversion = (
"{\n"
" rooted!(in(*cx) let mut rval = UndefinedValue());\n"
" if get_dictionary_property(*cx, object.handle(), "
f'"{member.identifier.name}", '
"rval.handle_mut(), CanGc::note())? && !rval.is_undefined() {\n"
f"{indent(conversion)}\n"
" } else {\n"
f"{indent(default)}\n"
" }\n"
"}")
return CGGeneric(conversion)
def makeEmpty(self):
if self.hasRequiredFields(self.dictionary):
return ""
parentTemplate = "parent: %s::%s::empty(),\n"
fieldTemplate = "%s: %s,\n"
functionTemplate = (
"pub fn empty() -> Self {\n"
" Self {\n"
"%s"
" }\n"
"}"
)
if self.membersNeedTracing():
parentTemplate = "dictionary.parent = %s::%s::empty();\n"
fieldTemplate = "dictionary.%s = %s;\n"
functionTemplate = (
"pub fn empty() -> RootedTraceableBox<Self> {\n"
" let mut dictionary = RootedTraceableBox::new(Self::default());\n"
"%s"
" dictionary\n"
"}"
)
s = ""
if self.dictionary.parent:
s += parentTemplate % (self.makeModuleName(self.dictionary.parent),
self.makeClassName(self.dictionary.parent))
for member, info in self.memberInfo:
if not member.optional:
return ""
default = info.default
if not default:
default = "None"
s += fieldTemplate % (self.makeMemberName(member.identifier.name), default)
return functionTemplate % CGIndenter(CGGeneric(s), 12).define()
def hasRequiredFields(self, dictionary):
if dictionary.parent:
if self.hasRequiredFields(dictionary.parent):
return True
for member in dictionary.members:
if not member.optional:
return True
return False
@staticmethod
def makeMemberName(name):
# Can't use Rust keywords as member names.
if name in RUST_KEYWORDS:
return f"{name}_"
return name
@staticmethod
def getDictionaryDependencies(dictionary):
deps = set()
if dictionary.parent:
deps.add(dictionary.parent)
for member in dictionary.members:
if member.type.isDictionary():
deps.add(member.type.unroll().inner)
return deps
class CGInitAllStatics(CGAbstractMethod):
def __init__(self, config):
docs = "Initialize the static data used by the SpiderMonkey DOM bindings to implement JS interfaces."
descriptors = (config.getDescriptors(isCallback=False, register=True)
+ config.getDescriptors(isCallback=True, hasInterfaceObject=True, register=True))
CGAbstractMethod.__init__(self, None, 'InitAllStatics', 'void', [],
pub=True, docs=docs, templateArgs=["D: DomTypes"])
self.descriptors = descriptors
def definition_body(self):
return CGList([
CGGeneric(f" GenericBindings::{toBindingModuleFileFromDescriptor(desc)}::{toBindingNamespace(desc.name)}"
"::init_statics::<D>();")
for desc in self.descriptors
], "\n")
class CGRegisterProxyHandlersMethod(CGAbstractMethod):
def __init__(self, descriptors):
docs = "Create the global vtables used by the generated DOM bindings to implement JS proxies."
CGAbstractMethod.__init__(self, None, 'RegisterProxyHandlers', 'void', [],
pub=True, docs=docs, templateArgs=["D: DomTypes"])
self.descriptors = descriptors
def definition_body(self):
body = [CGGeneric("unsafe {")]
body += [
CGGeneric(f"proxy_handlers::{desc.name}.store(\n"
f" GenericBindings::{toBindingModuleFile(desc.name)}::{toBindingNamespace(desc.name)}"
"::DefineProxyHandler::<D>() as *mut _,\n"
" std::sync::atomic::Ordering::Release,\n"
");")
for desc in self.descriptors
]
body += [CGGeneric("}")]
return CGList(body, "\n")
class CGRegisterProxyHandlers(CGThing):
def __init__(self, config):
descriptors = config.getDescriptors(proxy=True)
body = "".join(
f" pub(crate) static {desc.name}: std::sync::atomic::AtomicPtr<libc::c_void> =\n"
" std::sync::atomic::AtomicPtr::new(std::ptr::null_mut());\n"
for desc in descriptors
)
self.root = CGList([
CGGeneric(
"#[allow(non_upper_case_globals)]\n"
"pub(crate) mod proxy_handlers {\n"
f"{body}}}\n"
),
CGRegisterProxyHandlersMethod(descriptors),
], "\n")
def define(self):
return self.root.define()
class CGConcreteBindingRoot(CGThing):
"""
Root codegen class for binding generation, specialized on the concrete
type that is used by handwritten code. Re-export all public types from
the generic bindings with type specialization applied.
"""
def __init__(self, config, prefix, webIDLFile):
descriptors = config.getDescriptors(webIDLFile=webIDLFile,
hasInterfaceObject=True)
# We also want descriptors that have an interface prototype object
# (isCallback=False), but we don't want to include a second copy
# of descriptors that we also matched in the previous line
# (hence hasInterfaceObject=False).
descriptors.extend(config.getDescriptors(webIDLFile=webIDLFile,
hasInterfaceObject=False,
isCallback=False,
register=True))
dictionaries = config.getDictionaries(webIDLFile=webIDLFile)
mainCallbacks = config.getCallbacks(webIDLFile=webIDLFile)
callbackDescriptors = config.getDescriptors(webIDLFile=webIDLFile,
isCallback=True)
enums = config.getEnums(webIDLFile)
typedefs = config.getTypedefs(webIDLFile)
if not (descriptors or dictionaries or mainCallbacks or callbackDescriptors or enums):
self.root = None
return
originalBinding = f"crate::dom::bindings::codegen::{prefix.replace('/', '::').replace('Concrete', 'Generic')}"
cgthings = []
for e in enums:
enumName = e.identifier.name
cgthings += [
CGGeneric(f"pub(crate) use {originalBinding}::{enumName} as {enumName};"),
CGGeneric(f"pub(crate) use {originalBinding}::{enumName}Values as {enumName}Values;"),
]
cgthings += [CGGeneric(
f"pub(crate) type {t.identifier.name} = "
f"{originalBinding}::{t.identifier.name}"
f"{'::<crate::DomTypeHolder>' if containsDomInterface(t.innerType) else ''};"
) for t in typedefs]
cgthings += [CGGeneric(
f"pub(crate) type {d.identifier.name} = "
f"{originalBinding}::{d.identifier.name}"
f"{'::<crate::DomTypeHolder>' if containsDomInterface(d) else ''};"
) for d in dictionaries]
cgthings += [CGGeneric(
f"pub(crate) type {c.identifier.name} = "
f"{originalBinding}::{c.identifier.name}<crate::DomTypeHolder>;"
) for c in mainCallbacks]
cgthings += [CGGeneric(f"pub(crate) use {originalBinding} as GenericBindings;")]
for d in descriptors:
ifaceName = d.interface.identifier.name
cgthings += [
CGGeneric(
f"pub(crate) use {originalBinding}::{firstCap(ifaceName)}_Binding as {firstCap(ifaceName)}_Binding;"
),
]
if d.concrete:
if not d.interface.isIteratorInterface():
cgthings.append(CGAssertInheritance(d))
else:
cgthings.append(CGIteratorDerives(d))
if (
(d.concrete or d.hasDescendants())
and not d.interface.isIteratorInterface()
):
cgthings.append(CGIDLInterface(d))
if d.interface.isIteratorInterface():
cgthings.append(CGDomObjectIteratorWrap(d))
elif d.concrete and not d.isGlobal():
cgthings.append(CGDomObjectWrap(d))
if d.weakReferenceable:
cgthings.append(CGWeakReferenceableTrait(d))
if not d.interface.isCallback():
traitName = f"{ifaceName}Methods"
cgthings += [
CGGeneric(f"pub(crate) use self::{firstCap(ifaceName)}_Binding::{traitName} as {traitName};"),
]
if len(descriptors) == 1 and d.concrete:
cgthings += [CGGeneric(f"pub(crate) use self::{firstCap(ifaceName)}_Binding::Wrap;")]
if d.interface.hasInterfaceObject() and d.shouldHaveGetConstructorObjectMethod():
cgthings += [CGGeneric(f"""
pub(crate) fn GetConstructorObject(
cx: SafeJSContext, global: HandleObject, rval: MutableHandleObject
) {{
self::{firstCap(ifaceName)}_Binding::GetConstructorObject::<crate::DomTypeHolder>(cx, global, rval)
}}
""")]
constMembers = [m for m in d.interface.members if m.isConst()]
if constMembers:
constants = f"{ifaceName}Constants"
cgthings += [CGGeneric(f"pub(crate) use {originalBinding}::{constants} as {constants};")]
for c in callbackDescriptors:
ifaceName = c.interface.identifier.name
cgthings += [CGGeneric(
f"pub(crate) type {ifaceName} = {originalBinding}::{ifaceName}<crate::DomTypeHolder>;"
)]
# And make sure we have the right number of newlines at the end
curr = CGWrapper(CGList(cgthings, "\n\n"), post="\n\n")
# Add imports
# These are the global imports (outside of the generated module)
curr = CGImports(curr, descriptors=[], callbacks=[],
dictionaries=[], enums=[], typedefs=[],
imports=[
'crate::dom::bindings::import::module::*',
'crate::dom::types::*'],
config=config)
# Add the auto-generated comment.
curr = CGWrapper(curr, pre=f"{AUTOGENERATED_WARNING_COMMENT}{ALLOWED_WARNINGS}")
# Store the final result.
self.root = curr
def define(self):
if not self.root:
return None
return stripTrailingWhitespace(self.root.define())
class CGBindingRoot(CGThing):
"""
Root codegen class for binding generation. Instantiate the class, and call
declare or define to generate header or cpp code (respectively).
"""
def __init__(self, config, prefix, webIDLFile):
descriptors = config.getDescriptors(webIDLFile=webIDLFile,
hasInterfaceObject=True)
# We also want descriptors that have an interface prototype object
# (isCallback=False), but we don't want to include a second copy
# of descriptors that we also matched in the previous line
# (hence hasInterfaceObject=False).
descriptors.extend(config.getDescriptors(webIDLFile=webIDLFile,
hasInterfaceObject=False,
isCallback=False,
register=True))
dictionaries = config.getDictionaries(webIDLFile=webIDLFile)
mainCallbacks = config.getCallbacks(webIDLFile=webIDLFile)
callbackDescriptors = config.getDescriptors(webIDLFile=webIDLFile,
isCallback=True)
enums = config.getEnums(webIDLFile)
typedefs = config.getTypedefs(webIDLFile)
if not (descriptors or dictionaries or mainCallbacks or callbackDescriptors or enums):
self.root = None
return
# Do codegen for all the enums.
cgthings = [CGEnum(e, config) for e in enums]
# Do codegen for all the typedefs
for t in typedefs:
typeName = getRetvalDeclarationForType(t.innerType, config.getDescriptorProvider())
name = t.identifier.name
type = typeName.define()
if t.innerType.isUnion() and not t.innerType.nullable():
# Allow using the typedef's name for accessing variants.
typeDefinition = f"pub use self::{type.replace('<D>', '')} as {name};"
else:
generic = "<D>" if containsDomInterface(t.innerType) else ""
replacedType = type.replace("D::", "<D as DomTypes>::")
typeDefinition = f"pub type {name}{generic} = {replacedType};"
cgthings.append(CGGeneric(typeDefinition))
# Do codegen for all the dictionaries.
cgthings.extend([CGDictionary(d, config.getDescriptorProvider(), config)
for d in dictionaries])
# Do codegen for all the callbacks.
cgthings.extend(CGList([CGCallbackFunction(c, config.getDescriptorProvider()),
CGCallbackFunctionImpl(c)], "\n")
for c in mainCallbacks)
# Do codegen for all the descriptors
cgthings.extend([CGDescriptor(x, config, len(descriptors) == 1) for x in descriptors])
# Do codegen for all the callback interfaces.
cgthings.extend(CGList([CGCallbackInterface(x),
CGCallbackFunctionImpl(x.interface)], "\n")
for x in callbackDescriptors)
# And make sure we have the right number of newlines at the end
curr = CGWrapper(CGList(cgthings, "\n\n"), post="\n\n")
# Add imports
# These are the global imports (outside of the generated module)
curr = CGImports(curr, descriptors=callbackDescriptors, callbacks=mainCallbacks,
dictionaries=dictionaries, enums=enums, typedefs=typedefs,
imports=['crate::import::base::*'], config=config)
# Add the auto-generated comment.
curr = CGWrapper(curr, pre=f"{AUTOGENERATED_WARNING_COMMENT}{ALLOWED_WARNINGS}")
# Store the final result.
self.root = curr
def define(self):
if not self.root:
return None
return stripTrailingWhitespace(self.root.define())
def type_needs_tracing(t):
assert isinstance(t, IDLObject), (t, type(t))
if t.isType():
if isinstance(t, IDLWrapperType):
return type_needs_tracing(t.inner)
if t.nullable():
return type_needs_tracing(t.inner)
if t.isAny():
return True
if t.isObject():
return True
if t.isSequence():
return type_needs_tracing(t.inner)
if t.isUnion():
return any(type_needs_tracing(member) for member in t.flatMemberTypes)
if is_typed_array(t):
return True
return False
if t.isDictionary():
if t.parent and type_needs_tracing(t.parent):
return True
if any(type_needs_tracing(member.type) for member in t.members):
return True
return False
if t.isInterface():
return False
if t.isEnum():
return False
assert False, (t, type(t))
def is_typed_array(t):
assert isinstance(t, IDLObject), (t, type(t))
return t.isTypedArray() or t.isArrayBuffer() or t.isArrayBufferView()
def type_needs_auto_root(t):
"""
Certain IDL types, such as `sequence<any>` or `sequence<object>` need to be
traced and wrapped via (Custom)AutoRooter
"""
assert isinstance(t, IDLObject), (t, type(t))
if t.isType():
if t.isSequence() and (t.inner.isAny() or t.inner.isObject()):
return True
# SpiderMonkey interfaces, we currently don't support any other except typed arrays
if is_typed_array(t):
return True
return False
def argument_type(descriptorProvider, ty, optional=False, defaultValue=None, variadic=False):
info = getJSToNativeConversionInfo(
ty, descriptorProvider, isArgument=True,
isAutoRooted=type_needs_auto_root(ty))
declType = info.declType
if variadic:
if ty.isGeckoInterface():
declType = CGWrapper(declType, pre="&[", post="]")
else:
declType = CGWrapper(declType, pre="Vec<", post=">")
elif optional and not defaultValue:
declType = CGWrapper(declType, pre="Option<", post=">")
if ty.isDictionary() and not type_needs_tracing(ty):
declType = CGWrapper(declType, pre="&")
if type_needs_auto_root(ty):
declType = CGTemplatedType("CustomAutoRooterGuard", declType)
return declType.define()
def method_arguments(descriptorProvider, returnType, arguments, passJSBits=True, trailing=None,
inRealm=False, canGc=False):
if needCx(returnType, arguments, passJSBits):
yield "cx", "SafeJSContext"
for argument in arguments:
ty = argument_type(descriptorProvider, argument.type, argument.optional,
argument.defaultValue, argument.variadic)
yield CGDictionary.makeMemberName(argument.identifier.name), ty
if trailing:
yield trailing
if inRealm:
yield "_comp", "InRealm"
if canGc:
yield "_can_gc", "CanGc"
if returnTypeNeedsOutparam(returnType):
yield "rval", outparamTypeFromReturnType(returnType),
def return_type(descriptorProvider, rettype, infallible):
result = getRetvalDeclarationForType(rettype, descriptorProvider)
if rettype and returnTypeNeedsOutparam(rettype):
result = CGGeneric("()")
if not infallible:
result = CGWrapper(result, pre="Fallible<", post=">")
return result.define()
class CGNativeMember(ClassMethod):
def __init__(self, descriptorProvider, member, name, signature, extendedAttrs,
breakAfter=True, passJSBitsAsNeeded=True, visibility="public",
unsafe=False):
"""
If passJSBitsAsNeeded is false, we don't automatically pass in a
JSContext* or a JSObject* based on the return and argument types.
"""
self.descriptorProvider = descriptorProvider
self.member = member
self.extendedAttrs = extendedAttrs
self.passJSBitsAsNeeded = passJSBitsAsNeeded
breakAfterSelf = "\n" if breakAfter else ""
ClassMethod.__init__(self, name,
self.getReturnType(signature[0]),
self.getArgs(signature[0], signature[1]),
static=member.isStatic(),
# Mark our getters, which are attrs that
# have a non-void return type, as const.
const=(not member.isStatic() and member.isAttr()
and not signature[0].isUndefined()),
breakAfterSelf=breakAfterSelf,
unsafe=unsafe,
visibility=visibility)
def getReturnType(self, type):
infallible = 'infallible' in self.extendedAttrs
typeDecl = return_type(self.descriptorProvider, type, infallible)
return typeDecl
def getArgs(self, returnType, argList):
return [Argument(arg[1], arg[0]) for arg in method_arguments(self.descriptorProvider,
returnType,
argList,
self.passJSBitsAsNeeded)]
class CGCallback(CGClass):
def __init__(self, idlObject, descriptorProvider, baseName, methods):
self.baseName = baseName
self._deps = idlObject.getDeps()
name = idlObject.identifier.name
# For our public methods that needThisHandling we want most of the
# same args and the same return type as what CallbackMember
# generates. So we want to take advantage of all its
# CGNativeMember infrastructure, but that infrastructure can't deal
# with templates and most especially template arguments. So just
# cheat and have CallbackMember compute all those things for us.
realMethods = []
for method in methods:
if not method.needThisHandling:
realMethods.append(method)
else:
realMethods.extend(self.getMethodImpls(method))
CGClass.__init__(self, name,
bases=[ClassBase(baseName)],
constructors=self.getConstructors(),
methods=realMethods,
templateSpecialization=['D: DomTypes'],
decorators="#[derive(JSTraceable, PartialEq)]\n"
"#[cfg_attr(crown, allow(crown::unrooted_must_root))]\n"
"#[cfg_attr(crown, crown::unrooted_must_root_lint::allow_unrooted_interior)]")
def getConstructors(self):
return [ClassConstructor(
[Argument("SafeJSContext", "aCx"), Argument("*mut JSObject", "aCallback")],
bodyInHeader=True,
visibility="pub",
explicit=False,
baseConstructors=[
f"{self.baseName.replace('<D>', '')}::new()"
])]
def getMethodImpls(self, method):
assert method.needThisHandling
args = list(method.args)
# Strip out the JSContext*/JSObject* args
# that got added.
assert args[0].name == "cx" and args[0].argType == "SafeJSContext"
assert args[1].name == "aThisObj" and args[1].argType == "HandleValue"
args = args[2:]
# Record the names of all the arguments, so we can use them when we call
# the private method.
argnames = [arg.name for arg in args] + ["can_gc"]
argnamesWithThis = ["s.get_context()", "thisValue.handle()"] + argnames
argnamesWithoutThis = ["s.get_context()", "HandleValue::undefined()"] + argnames
# Now that we've recorded the argnames for our call to our private
# method, insert our optional argument for deciding whether the
# CallSetup should re-throw exceptions on aRv.
args.append(Argument("ExceptionHandling", "aExceptionHandling",
"ReportExceptions"))
args.append(Argument("CanGc", "can_gc"))
method.args.append(Argument("CanGc", "can_gc"))
# And now insert our template argument.
argsWithoutThis = list(args)
args.insert(0, Argument("&T", "thisObj"))
# And the self argument
method.args.insert(0, Argument(None, "&self"))
args.insert(0, Argument(None, "&self"))
argsWithoutThis.insert(0, Argument(None, "&self"))
setupCall = "let s = CallSetup::<D>::new(self, aExceptionHandling);\n"
bodyWithThis = (
f"{setupCall}rooted!(in(*s.get_context()) let mut thisValue: JSVal);\n"
"let wrap_result = wrap_call_this_value(s.get_context(), thisObj, thisValue.handle_mut());\n"
"if !wrap_result {\n"
" return Err(JSFailed);\n"
"}\n"
f"unsafe {{ self.{method.name}({', '.join(argnamesWithThis)}) }}")
bodyWithoutThis = (
f"{setupCall}\n"
f"unsafe {{ self.{method.name}({', '.join(argnamesWithoutThis)}) }}")
return [ClassMethod(f'{method.name}_', method.returnType, args,
bodyInHeader=True,
templateArgs=["T: ThisReflector"],
body=bodyWithThis,
visibility='pub'),
ClassMethod(f'{method.name}__', method.returnType, argsWithoutThis,
bodyInHeader=True,
body=bodyWithoutThis,
visibility='pub'),
method]
def deps(self):
return self._deps
# We're always fallible
def callbackGetterName(attr, descriptor):
return f"Get{MakeNativeName(descriptor.binaryNameFor(attr.identifier.name))}"
def callbackSetterName(attr, descriptor):
return f"Set{MakeNativeName(descriptor.binaryNameFor(attr.identifier.name))}"
class CGCallbackFunction(CGCallback):
def __init__(self, callback, descriptorProvider):
CGCallback.__init__(self, callback, descriptorProvider,
"CallbackFunction<D>",
methods=[CallCallback(callback, descriptorProvider)])
def getConstructors(self):
return CGCallback.getConstructors(self)
class CGCallbackFunctionImpl(CGGeneric):
def __init__(self, callback):
type = f"{callback.identifier.name}<D>"
impl = (f"""
impl<D: DomTypes> CallbackContainer<D> for {type} {{
unsafe fn new(cx: SafeJSContext, callback: *mut JSObject) -> Rc<{type}> {{
{type.replace('<D>', '')}::new(cx, callback)
}}
fn callback_holder(&self) -> &CallbackObject<D> {{
self.parent.callback_holder()
}}
}}
impl<D: DomTypes> ToJSValConvertible for {type} {{
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {{
self.callback().to_jsval(cx, rval);
}}
}}
""")
CGGeneric.__init__(self, impl)
class CGCallbackInterface(CGCallback):
def __init__(self, descriptor):
iface = descriptor.interface
attrs = [m for m in iface.members if m.isAttr() and not m.isStatic()]
assert not attrs
methods = [m for m in iface.members
if m.isMethod() and not m.isStatic() and not m.isIdentifierLess()]
methods = [CallbackOperation(m, sig, descriptor) for m in methods
for sig in m.signatures()]
assert not iface.isJSImplemented() or not iface.ctor()
CGCallback.__init__(self, iface, descriptor, "CallbackInterface<D>", methods)
class FakeMember():
def __init__(self):
pass
def isStatic(self):
return False
def isAttr(self):
return False
def isMethod(self):
return False
def getExtendedAttribute(self, name):
return None
class CallbackMember(CGNativeMember):
def __init__(self, sig, name, descriptorProvider, needThisHandling):
"""
needThisHandling is True if we need to be able to accept a specified
thisObj, False otherwise.
"""
self.retvalType = sig[0]
self.originalSig = sig
args = sig[1]
self.argCount = len(args)
if self.argCount > 0:
# Check for variadic arguments
lastArg = args[self.argCount - 1]
if lastArg.variadic:
self.argCountStr = (
f"{self.argCount - 1} + {lastArg.identifier.name}.len()").removeprefix("0 + ")
else:
self.argCountStr = f"{self.argCount}"
self.usingOutparam = returnTypeNeedsOutparam(self.retvalType)
self.needThisHandling = needThisHandling
# If needThisHandling, we generate ourselves as private and the caller
# will handle generating public versions that handle the "this" stuff.
visibility = "priv" if needThisHandling else "pub"
# We don't care, for callback codegen, whether our original member was
# a method or attribute or whatnot. Just always pass FakeMember()
# here.
CGNativeMember.__init__(self, descriptorProvider, FakeMember(),
name, (self.retvalType, args),
extendedAttrs={},
passJSBitsAsNeeded=False,
unsafe=needThisHandling,
visibility=visibility)
# We have to do all the generation of our body now, because
# the caller relies on us throwing if we can't manage it.
self.exceptionCode = "return Err(JSFailed);\n"
self.body = self.getImpl()
def getImpl(self):
argvDecl = (
"rooted_vec!(let mut argv);\n"
f"argv.extend((0..{self.argCountStr}).map(|_| Heap::default()));\n"
) if self.argCount > 0 else "" # Avoid weird 0-sized arrays
# Newlines and semicolons are in the values
pre = (
f"{self.getCallSetup()}"
f"{self.getRvalDecl()}"
f"{argvDecl}"
)
body = (
f"{self.getArgConversions()}"
f"{self.getCall()}"
f"{self.getResultConversion()}"
)
return f"{pre}\n{body}"
def getResultConversion(self):
replacements = {
"val": "rval.handle()",
}
info = getJSToNativeConversionInfo(
self.retvalType,
self.descriptorProvider,
exceptionCode=self.exceptionCode,
isCallbackReturnValue="Callback",
# XXXbz we should try to do better here
sourceDescription="return value")
template = info.template
declType = info.declType
if self.usingOutparam:
convertType = CGGeneric("")
else:
convertType = instantiateJSToNativeConversionTemplate(
template, replacements, declType, "retval")
if self.retvalType is None or self.retvalType.isUndefined() or self.usingOutparam:
retval = "()"
else:
retval = "retval"
return f"{convertType.define()}\nOk({retval})\n"
def getArgConversions(self):
# Just reget the arglist from self.originalSig, because our superclasses
# just have way to many members they like to clobber, so I can't find a
# safe member name to store it in.
arglist = self.originalSig[1]
argConversions = [self.getArgConversion(i, arg) for (i, arg)
in enumerate(arglist)]
# Do them back to front, so our argc modifications will work
# correctly, because we examine trailing arguments first.
argConversions.reverse()
argConversions = [CGGeneric(c) for c in argConversions]
# If arg count is only 1 but it's optional and not default value,
# argc should be mutable.
if self.argCount == 1 and not (arglist[0].optional and not arglist[0].defaultValue):
argConversions.insert(0, self.getArgcDecl(True))
elif self.argCount > 0:
argConversions.insert(0, self.getArgcDecl(False))
# And slap them together.
return CGList(argConversions, "\n\n").define() + "\n\n"
def getArgConversion(self, i, arg):
argval = arg.identifier.name
if arg.variadic:
argval = f"{argval}[idx].get()"
jsvalIndex = f"{i} + idx"
else:
jsvalIndex = f"{i}"
if arg.optional and not arg.defaultValue:
argval += ".unwrap()"
conversion = wrapForType(
"argv_root.handle_mut()", result=argval,
successCode=("{\n"
f"let arg = &mut argv[{jsvalIndex.removeprefix('0 + ')}];\n"
"*arg = Heap::default();\n"
"arg.set(argv_root.get());\n"
"}"),
pre="rooted!(in(*cx) let mut argv_root = UndefinedValue());")
if arg.variadic:
conversion = (
f"for idx in 0..{arg.identifier.name}.len() {{\n"
f"{CGIndenter(CGGeneric(conversion)).define()}\n}}"
)
elif arg.optional and not arg.defaultValue:
conversion = (
f"{CGIfWrapper(f'{arg.identifier.name}.is_some()', CGGeneric(conversion)).define()}"
f" else if argc == {i + 1} {{\n"
" // This is our current trailing argument; reduce argc\n"
" argc -= 1;\n"
"} else {\n"
f" argv[{i}] = Heap::default();\n"
"}"
)
return conversion
def getArgs(self, returnType, argList):
args = CGNativeMember.getArgs(self, returnType, argList)
if not self.needThisHandling:
# Since we don't need this handling, we're the actual method that
# will be called, so we need an aRethrowExceptions argument.
args.append(Argument("ExceptionHandling", "aExceptionHandling",
"ReportExceptions"))
return args
# We want to allow the caller to pass in a "this" object, as
# well as a JSContext.
return [Argument("SafeJSContext", "cx"),
Argument("HandleValue", "aThisObj")] + args
def getCallSetup(self):
if self.needThisHandling:
# It's been done for us already
return ""
return (
"CallSetup s(CallbackPreserveColor(), aRv, aExceptionHandling);\n"
"JSContext* cx = *s.get_context();\n"
"if (!cx) {\n"
" return Err(JSFailed);\n"
"}\n")
def getArgcDecl(self, immutable):
if immutable:
return CGGeneric(f"let argc = {self.argCountStr};")
return CGGeneric(f"let mut argc = {self.argCountStr};")
@staticmethod
def ensureASCIIName(idlObject):
type = "attribute" if idlObject.isAttr() else "operation"
if re.match("[^\x20-\x7E]", idlObject.identifier.name):
raise SyntaxError(f'Callback {type} name "{idlObject.identifier.name}" contains non-ASCII '
f"characters. We can't handle that. {idlObject.location}")
if re.match('"', idlObject.identifier.name):
raise SyntaxError(f"Callback {type} name '{idlObject.identifier.name}' contains "
"double-quote character. We can't handle "
f"that. {idlObject.location}")
class CallbackMethod(CallbackMember):
def __init__(self, sig, name, descriptorProvider, needThisHandling):
CallbackMember.__init__(self, sig, name, descriptorProvider,
needThisHandling)
def getRvalDecl(self):
if self.usingOutparam:
return ""
else:
return "rooted!(in(*cx) let mut rval = UndefinedValue());\n"
def getCall(self):
if self.argCount > 0:
argv = "argv.as_ptr() as *const JSVal"
argc = "argc"
else:
argv = "ptr::null_mut()"
argc = "0"
suffix = "" if self.usingOutparam else ".handle_mut()"
return (f"{self.getCallableDecl()}"
f"rooted!(in(*cx) let rootedThis = {self.getThisObj()});\n"
f"let ok = {self.getCallGuard()}Call(\n"
" *cx, rootedThis.handle(), callable.handle(),\n"
" &HandleValueArray {\n"
f" length_: {argc} as ::libc::size_t,\n"
f" elements_: {argv}\n"
f" }}, rval{suffix});\n"
"maybe_resume_unwind();\n"
"if !ok {\n"
" return Err(JSFailed);\n"
"}\n")
class CallCallback(CallbackMethod):
def __init__(self, callback, descriptorProvider):
self.callback = callback
CallbackMethod.__init__(self, callback.signatures()[0], "Call",
descriptorProvider, needThisHandling=True)
def getThisObj(self):
return "aThisObj.get()"
def getCallableDecl(self):
return "rooted!(in(*cx) let callable = ObjectValue(self.callback()));\n"
def getCallGuard(self):
if self.callback._treatNonObjectAsNull:
return "!IsCallable(self.callback()) || "
return ""
class CallbackOperationBase(CallbackMethod):
"""
Common class for implementing various callback operations.
"""
def __init__(self, signature, jsName, nativeName, descriptor, singleOperation):
self.singleOperation = singleOperation
self.methodName = jsName
CallbackMethod.__init__(self, signature, nativeName, descriptor, singleOperation)
def getThisObj(self):
if not self.singleOperation:
return "ObjectValue(self.callback())"
# This relies on getCallableDecl declaring a boolean
# isCallable in the case when we're a single-operation
# interface.
return "if isCallable { aThisObj.get() } else { ObjectValue(self.callback()) }"
def getCallableDecl(self):
getCallableFromProp = f'self.parent.get_callable_property(cx, "{self.methodName}")?'
if not self.singleOperation:
return f'rooted!(in(*cx) let callable =\n{getCallableFromProp});\n'
callable = CGIndenter(
CGIfElseWrapper('isCallable', CGGeneric('ObjectValue(self.callback())'), CGGeneric(getCallableFromProp))
).define()
return ('let isCallable = IsCallable(self.callback());\n'
'rooted!(in(*cx) let callable =\n'
f"{callable});\n")
def getCallGuard(self):
return ""
class CallbackOperation(CallbackOperationBase):
"""
Codegen actual WebIDL operations on callback interfaces.
"""
def __init__(self, method, signature, descriptor):
self.ensureASCIIName(method)
jsName = method.identifier.name
CallbackOperationBase.__init__(self, signature,
jsName,
MakeNativeName(descriptor.binaryNameFor(jsName)),
descriptor, descriptor.interface.isSingleOperationInterface())
class CGMaplikeOrSetlikeMethodGenerator(CGGeneric):
"""
Creates methods for *like interfaces. Unwrapping/wrapping
will be taken care of by the usual method generation machinery in
CGMethodCall/CGPerSignatureCall. Functionality is filled in here instead of
using CGCallGenerator.
"""
def __init__(self, descriptor, likeable, methodName):
trait: str
if likeable.isSetlike():
trait = "Setlike"
elif likeable.isMaplike():
trait = "Maplike"
else:
raise TypeError("CGMaplikeOrSetlikeMethodGenerator is only for Setlike/Maplike")
"""
setlike:
fn size(&self) -> usize;
fn add(&self, key: Self::Key);
fn has(&self, key: &Self::Key) -> bool;
fn clear(&self);
fn delete(&self, key: &Self::Key) -> bool;
maplike:
fn get(&self, key: Self::Key) -> Self::Value;
fn size(&self) -> usize;
fn set(&self, key: Self::Key, value: Self::Value);
fn has(&self, key: &Self::Key) -> bool;
fn clear(&self);
fn delete(&self, key: &Self::Key) -> bool;
like iterable:
keys/values/entries/forEach
"""
# like iterables are implemented seperatly as we are actually implementing them
if methodName in ["keys", "values", "entries", "forEach"]:
CGIterableMethodGenerator.__init__(self, descriptor, likeable, methodName)
elif methodName in ["size", "clear"]: # zero arguments
CGGeneric.__init__(self, fill(
"""
let result = ${trt}::${method}(this);
""",
trt=trait,
method=methodName.lower()))
elif methodName == "add": # special case one argumet
CGGeneric.__init__(self, fill(
"""
${trt}::${method}(this, arg0);
// Returns itself per https://webidl.spec.whatwg.org/#es-set-add
let result = this;
""",
trt=trait,
method=methodName))
elif methodName in ["has", "delete", "get"]: # one argument
CGGeneric.__init__(self, fill(
"""
let result = ${trt}::${method}(this, arg0);
""",
trt=trait,
method=methodName))
elif methodName == "set": # two arguments
CGGeneric.__init__(self, fill(
"""
${trt}::${method}(this, arg0, arg1);
// Returns itself per https://webidl.spec.whatwg.org/#es-map-set
let result = this;
""",
trt=trait,
method=methodName))
else:
raise TypeError(f"Do not know how to impl *like method: {methodName}")
class CGIterableMethodGenerator(CGGeneric):
"""
Creates methods for iterable interfaces. Unwrapping/wrapping
will be taken care of by the usual method generation machinery in
CGMethodCall/CGPerSignatureCall. Functionality is filled in here instead of
using CGCallGenerator.
"""
def __init__(self, descriptor, iterable, methodName):
if methodName == "forEach":
CGGeneric.__init__(self, fill(
"""
if !IsCallable(arg0) {
throw_type_error(*cx, "Argument 1 of ${ifaceName}.forEach is not callable.");
return false;
}
rooted!(in(*cx) let arg0 = ObjectValue(arg0));
rooted!(in(*cx) let mut call_arg1 = UndefinedValue());
rooted!(in(*cx) let mut call_arg2 = UndefinedValue());
rooted_vec!(let mut call_args);
call_args.push(UndefinedValue());
call_args.push(UndefinedValue());
call_args.push(ObjectValue(*_obj));
rooted!(in(*cx) let mut ignoredReturnVal = UndefinedValue());
// This has to be a while loop since get_iterable_length() may change during
// the callback, and we need to avoid iterator invalidation.
//
// It is possible for this to loop infinitely, but that matches the spec
// and other browsers.
//
// https://heycam.github.io/webidl/#es-forEach
let mut i = 0;
while i < (*this).get_iterable_length() {
(*this).get_value_at_index(i).to_jsval(*cx, call_arg1.handle_mut());
(*this).get_key_at_index(i).to_jsval(*cx, call_arg2.handle_mut());
call_args[0] = call_arg1.handle().get();
call_args[1] = call_arg2.handle().get();
let call_args_handle = HandleValueArray::from(&call_args);
if !Call(*cx, arg1, arg0.handle(), &call_args_handle,
ignoredReturnVal.handle_mut()) {
return false;
}
i += 1;
}
let result = ();
""",
ifaceName=descriptor.interface.identifier.name))
return
CGGeneric.__init__(self, fill(
"""
let realm = AlreadyInRealm::assert_for_cx(cx);
let result = ${iterClass}::new(this, IteratorType::${itrMethod}, InRealm::already(&realm));
""",
iterClass=iteratorNativeType(descriptor, True),
ifaceName=descriptor.interface.identifier.name,
itrMethod=methodName.title()))
def camel_to_upper_snake(s):
return "_".join(m.group(0).upper() for m in re.finditer("[A-Z][a-z]*", s))
def process_arg(expr, arg):
if arg.type.isGeckoInterface() and not arg.type.unroll().inner.isCallback():
if arg.variadic or arg.type.isSequence():
expr += ".r()"
elif arg.type.nullable() and arg.optional and not arg.defaultValue:
expr += ".as_ref().map(Option::as_deref)"
elif arg.type.nullable() or arg.optional and not arg.defaultValue:
expr += ".as_deref()"
else:
expr = f"&{expr}"
elif isinstance(arg.type, IDLPromiseType):
expr = f"&{expr}"
return expr
class GlobalGenRoots():
"""
Roots for global codegen.
To generate code, call the method associated with the target, and then
call the appropriate define/declare method.
"""
@staticmethod
def Globals(config):
global_descriptors = config.getDescriptors(isGlobal=True)
flags = [("EMPTY", 0)]
flags.extend(
(camel_to_upper_snake(d.name), 2 ** idx)
for (idx, d) in enumerate(global_descriptors)
)
global_flags = CGWrapper(CGIndenter(CGList([
CGGeneric(f"const {args[0]} = {args[1]};")
for args in flags
], "\n")), pre="#[derive(Clone, Copy)]\npub struct Globals: u8 {\n", post="\n}")
globals_ = CGWrapper(CGIndenter(global_flags), pre="bitflags::bitflags! {\n", post="\n}")
return CGList([
CGGeneric(AUTOGENERATED_WARNING_COMMENT),
globals_,
])
@staticmethod
def InterfaceObjectMap(config):
mods = [
"crate::dom::bindings::codegen",
"crate::script_runtime::JSContext",
"js::rust::HandleObject",
]
imports = CGList([CGGeneric(f"use {mod};") for mod in mods], "\n")
phf = CGGeneric("include!(concat!(env!(\"BINDINGS_OUT_DIR\"), \"/InterfaceObjectMapPhf.rs\"));")
return CGList([
CGGeneric(AUTOGENERATED_WARNING_COMMENT),
CGList([imports, phf], "\n\n")
])
@staticmethod
def InterfaceObjectMapData(config):
pairs = []
for d in config.getDescriptors(hasInterfaceObject=True, isInline=False):
binding_mod = toBindingModuleFileFromDescriptor(d)
binding_ns = toBindingNamespace(d.name)
pairs.append((d.name, binding_mod, binding_ns))
for alias in d.interface.legacyWindowAliases:
pairs.append((alias, binding_mod, binding_ns))
for ctor in d.interface.legacyFactoryFunctions:
pairs.append((ctor.identifier.name, binding_mod, binding_ns))
pairs.sort(key=operator.itemgetter(0))
mappings = [
CGGeneric(f'"{pair[0]}": "codegen::Bindings::{pair[1]}'
f'::{pair[2]}::DefineDOMInterface::<crate::DomTypeHolder>"')
for pair in pairs
]
return CGWrapper(
CGList(mappings, ",\n"),
pre="{\n",
post="\n}\n")
@staticmethod
def PrototypeList(config):
# Prototype ID enum.
interfaces = config.getDescriptors(isCallback=False, isNamespace=False)
protos = [d.name for d in interfaces]
constructors = sorted([MakeNativeName(d.name)
for d in config.getDescriptors(hasInterfaceObject=True)
if d.shouldHaveGetConstructorObjectMethod()])
return CGList([
CGGeneric(AUTOGENERATED_WARNING_COMMENT),
CGGeneric(f"pub const PROTO_OR_IFACE_LENGTH: usize = {len(protos) + len(constructors)};\n"),
CGGeneric(f"pub const MAX_PROTO_CHAIN_LENGTH: usize = {config.maxProtoChainLength};\n\n"),
CGGeneric("#[allow(clippy::enum_variant_names, dead_code)]"),
CGNonNamespacedEnum('ID', protos, 0, deriving="PartialEq, Copy, Clone", repr="u16"),
CGNonNamespacedEnum('Constructor', constructors, len(protos),
deriving="PartialEq, Copy, Clone", repr="u16"),
CGWrapper(CGIndenter(CGList([CGGeneric(f'"{name}"') for name in protos],
",\n"),
indentLevel=4),
pre=f"static INTERFACES: [&str; {len(protos)}] = [\n",
post="\n];\n\n"),
CGGeneric("pub fn proto_id_to_name(proto_id: u16) -> &'static str {\n"
" debug_assert!(proto_id < ID::Last as u16);\n"
" INTERFACES[proto_id as usize]\n"
"}\n\n"),
])
@staticmethod
def RegisterBindings(config):
# TODO - Generate the methods we want
code = CGList([
CGRegisterProxyHandlers(config),
CGInitAllStatics(config),
], "\n")
return CGImports(code, descriptors=[], callbacks=[], dictionaries=[], enums=[], typedefs=[], imports=[
'crate::codegen::GenericBindings',
'crate::DomTypes',
], config=config)
@staticmethod
def InterfaceTypes(config):
descriptors = sorted([MakeNativeName(d.name)
for d in config.getDescriptors(register=True,
isCallback=False,
isIteratorInterface=False)])
curr = CGList([CGGeneric(f"pub(crate) use crate::dom::{name.lower()}::{MakeNativeName(name)};\n")
for name in descriptors])
curr = CGWrapper(curr, pre=AUTOGENERATED_WARNING_COMMENT)
return curr
@staticmethod
def Bindings(config):
def leafModule(d):
return getModuleFromObject(d).split('::')[-1]
descriptors = config.getDescriptors(register=True, isIteratorInterface=False)
descriptors = (set(toBindingModuleFile(d.name) for d in descriptors if d.maybeGetSuperModule() is None)
| set(leafModule(d) for d in config.callbacks)
| set(leafModule(d) for d in config.getDictionaries()))
curr = CGList([CGGeneric(
"#[allow(clippy::derivable_impls)]\n"
f"pub mod {name};\n"
) for name in sorted(descriptors)])
curr = CGWrapper(curr, pre=AUTOGENERATED_WARNING_COMMENT)
return curr
@staticmethod
def ConcreteInheritTypes(config):
descriptors = config.getDescriptors(register=True, isCallback=False)
imports = [CGGeneric("use crate::dom::types::*;\n"),
CGGeneric("use script_bindings::codegen::InheritTypes::*;\n"),
CGGeneric("use crate::dom::bindings::conversions::{DerivedFrom, get_dom_class};\n"),
CGGeneric("use crate::dom::bindings::inheritance::Castable;\n"),
CGGeneric("use crate::dom::bindings::reflector::DomObject;\n\n")]
allprotos = []
topTypes = []
hierarchy = defaultdict(list)
for descriptor in descriptors:
name = descriptor.name
chain = descriptor.prototypeChain
upcast = descriptor.hasDescendants()
downcast = len(chain) != 1
if upcast and not downcast:
topTypes.append(name)
if not upcast:
# No other interface will implement DeriveFrom<Foo> for this Foo, so avoid
# implementing it for itself.
chain = chain[:-1]
# Implement `DerivedFrom<Bar>` for `Foo`, for all `Bar` that `Foo` inherits from.
if chain:
allprotos.append(CGGeneric(f"impl Castable for {name} {{}}\n"))
for baseName in chain:
allprotos.append(CGGeneric(f"impl DerivedFrom<{baseName}> for {name} {{}}\n"))
if chain:
allprotos.append(CGGeneric("\n"))
if downcast:
hierarchy[descriptor.interface.parent.identifier.name].append(name)
typeIdCode = []
for base, derived in hierarchy.items():
if base in topTypes:
typeIdCode.append(CGGeneric(f"""
impl {base} {{
#[allow(dead_code)]
pub(crate) fn type_id(&self) -> &'static {base}TypeId {{
unsafe {{
&get_dom_class(self.reflector().get_jsobject().get())
.unwrap()
.type_id
.{base.lower()}
}}
}}
}}
"""))
curr = CGList(imports + typeIdCode + allprotos)
curr = CGWrapper(curr, pre=AUTOGENERATED_WARNING_COMMENT)
return curr
@staticmethod
def InheritTypes(config):
descriptors = config.getDescriptors(register=True, isCallback=False)
topTypes = []
hierarchy = defaultdict(list)
for descriptor in descriptors:
name = descriptor.name
upcast = descriptor.hasDescendants()
downcast = len(descriptor.prototypeChain) != 1
if upcast and not downcast:
topTypes.append(name)
if downcast:
hierarchy[descriptor.interface.parent.identifier.name].append(name)
typeIdCode = []
topTypeVariants = [
("ID used by abstract interfaces.", "pub abstract_: ()"),
("ID used by interfaces that are not castable.", "pub alone: ()"),
]
topTypeVariants += [
(f"ID used by interfaces that derive from {typeName}.",
f"pub {typeName.lower()}: {typeName}TypeId")
for typeName in topTypes
]
topTypeVariantsAsStrings = [CGGeneric(f"/// {variant[0]}\n{variant[1]},") for variant in topTypeVariants]
typeIdCode.append(CGWrapper(CGIndenter(CGList(topTypeVariantsAsStrings, "\n"), 4),
pre="#[derive(Copy)]\npub union TopTypeId {\n",
post="\n}\n\n"))
typeIdCode.append(CGGeneric("""\
impl Clone for TopTypeId {
fn clone(&self) -> Self { *self }
}
"""))
def type_id_variant(name):
# If `name` is present in the hierarchy keys', that means some other interfaces
# derive from it and this enum variant should have an argument with its own
# TypeId enum.
return f"{name}({name}TypeId)" if name in hierarchy else name
for base, derived in hierarchy.items():
variants = []
if config.getDescriptor(base).concrete:
variants.append(CGGeneric(base))
variants += [CGGeneric(type_id_variant(derivedName)) for derivedName in derived]
derives = "Clone, Copy, Debug, PartialEq"
typeIdCode.append(CGWrapper(CGIndenter(CGList(variants, ",\n"), 4),
pre=f"#[derive({derives})]\npub enum {base}TypeId {{\n",
post="\n}\n\n"))
curr = CGList(typeIdCode)
curr = CGWrapper(curr, pre=AUTOGENERATED_WARNING_COMMENT)
return curr
@staticmethod
def ConcreteUnionTypes(config):
unions = set()
cgthings = []
allTypes = getAllTypes(
config.getDescriptors(), config.getDictionaries(), config.getCallbacks(), config.typedefs
)
for (t, descriptor) in allTypes:
t = t.unroll()
name = str(t)
if not t.isUnion() or name in unions:
continue
unions.add(name)
generic = "<crate::DomTypeHolder>" if containsDomInterface(t) else ""
cgthings += [CGGeneric(f"pub(crate) type {name} = "
f"script_bindings::codegen::GenericUnionTypes::{name}{generic};\n")]
curr = CGList(cgthings)
curr = CGWrapper(curr, pre=AUTOGENERATED_WARNING_COMMENT)
return curr
@staticmethod
def UnionTypes(config):
curr = UnionTypes(config.getDescriptors(),
config.getDictionaries(),
config.getCallbacks(),
config.typedefs,
config)
# Add the auto-generated comment.
curr = CGWrapper(curr, pre=AUTOGENERATED_WARNING_COMMENT)
# Done.
return curr
@staticmethod
def DomTypes(config):
curr = DomTypes(config.getDescriptors(),
config.getDescriptorProvider(),
config.getDictionaries(),
config.getCallbacks(),
config.typedefs,
config)
# Add the auto-generated comment.
curr = CGWrapper(curr, pre=AUTOGENERATED_WARNING_COMMENT)
# Done.
return curr
@staticmethod
def DomTypeHolder(config):
curr = DomTypeHolder(config.getDescriptors(),
config.getDescriptorProvider(),
config.getDictionaries(),
config.getCallbacks(),
config.typedefs,
config)
# Add the auto-generated comment.
curr = CGWrapper(curr, pre=AUTOGENERATED_WARNING_COMMENT)
# Done.
return curr
@staticmethod
def SupportedDomApis(config):
descriptors = config.getDescriptors(isExposedConditionally=False)
base_path = os.path.dirname(__file__)
with open(os.path.join(base_path, 'apis.html.template')) as f:
base_template = f.read()
with open(os.path.join(base_path, 'api.html.template')) as f:
api_template = f.read()
with open(os.path.join(base_path, 'property.html.template')) as f:
property_template = f.read()
with open(os.path.join(base_path, 'interface.html.template')) as f:
interface_template = f.read()
apis = []
interfaces = []
for descriptor in descriptors:
props = []
for m in descriptor.interface.members:
if PropertyDefiner.getStringAttr(m, 'Pref') or \
PropertyDefiner.getStringAttr(m, 'Func') or \
PropertyDefiner.getStringAttr(m, 'Exposed') or \
m.getExtendedAttribute('SecureContext') or \
(m.isMethod() and m.isIdentifierLess()):
continue
bracket = '()' if m.isMethod() else ''
display = f"{m.identifier.name}{bracket}"
props += [property_template.replace('${name}', display)]
name = descriptor.interface.identifier.name
apis += [(api_template.replace('${interface}', name)
.replace('${properties}', '\n'.join(props)))]
interfaces += [interface_template.replace('${interface}', name)]
return CGGeneric((base_template.replace('${apis}', '\n'.join(apis))
.replace('${interfaces}', '\n'.join(interfaces))))
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