mirror of
https://github.com/servo/servo.git
synced 2025-08-03 12:40:06 +01:00
Add inheritance-checking lint
This commit is contained in:
parent
7d65673561
commit
d761877ef6
9 changed files with 139 additions and 21 deletions
|
@ -5,18 +5,22 @@
|
|||
use syntax::{ast, ast_map, ast_util, codemap, visit};
|
||||
use syntax::ast::Public;
|
||||
use syntax::attr::AttrMetaMethods;
|
||||
use rustc::lint::{Context, LintPass, LintArray};
|
||||
use rustc::lint::{Context, LintPass, LintArray, Level};
|
||||
use rustc::middle::ty::expr_ty;
|
||||
use rustc::middle::{ty, def};
|
||||
use rustc::middle::typeck::astconv::AstConv;
|
||||
use rustc::util::ppaux::Repr;
|
||||
|
||||
use utils::match_lang_ty;
|
||||
|
||||
declare_lint!(TRANSMUTE_TYPE_LINT, Allow,
|
||||
"Warn and report types being transmuted")
|
||||
declare_lint!(UNROOTED_MUST_ROOT, Deny,
|
||||
"Warn and report usage of unrooted jsmanaged objects")
|
||||
declare_lint!(PRIVATIZE, Deny,
|
||||
"Allows to enforce private fields for struct definitions")
|
||||
declare_lint!(INHERITANCE_INTEGRITY, Deny,
|
||||
"Ensures that struct fields are properly laid out for inheritance to work")
|
||||
|
||||
/// Lint for auditing transmutes
|
||||
///
|
||||
|
@ -41,6 +45,12 @@ pub struct UnrootedPass;
|
|||
/// This lint (disable with `-A privatize`/`#[allow(privatize)]`) ensures all types marked with `#[privatize]` have no private fields
|
||||
pub struct PrivatizePass;
|
||||
|
||||
/// Lint for ensuring proper layout of DOM structs
|
||||
///
|
||||
/// A DOM struct must have one Reflector field or one field
|
||||
/// which itself is a DOM struct (in which case it must be the first field).
|
||||
pub struct InheritancePass;
|
||||
|
||||
impl LintPass for TransmutePass {
|
||||
fn get_lints(&self) -> LintArray {
|
||||
lint_array!(TRANSMUTE_TYPE_LINT)
|
||||
|
@ -251,3 +261,65 @@ impl LintPass for PrivatizePass {
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl LintPass for InheritancePass {
|
||||
fn get_lints(&self) -> LintArray {
|
||||
lint_array!(INHERITANCE_INTEGRITY)
|
||||
}
|
||||
|
||||
fn check_struct_def(&mut self, cx: &Context, def: &ast::StructDef, _i: ast::Ident, _gen: &ast::Generics, id: ast::NodeId) {
|
||||
// Lints are run post expansion, so it's fine to use
|
||||
// #[_dom_struct_marker] here without also checking for #[dom_struct]
|
||||
if ty::has_attr(cx.tcx, ast_util::local_def(id), "_dom_struct_marker") {
|
||||
// Find the reflector, if any
|
||||
let reflector_span = def.fields.iter()
|
||||
.find(|f| match_lang_ty(cx, &*f.node.ty, "reflector"))
|
||||
.map(|f| f.span);
|
||||
// Find all #[dom_struct] fields
|
||||
let dom_spans: Vec<_> = def.fields.iter().enumerate().filter_map(|(ctr, f)| {
|
||||
if let ast::TyPath(_, _, ty_id) = f.node.ty.node {
|
||||
if let Some(def::DefTy(def_id, _)) = cx.tcx.def_map.borrow().find_copy(&ty_id) {
|
||||
if ty::has_attr(cx.tcx, def_id, "_dom_struct_marker") {
|
||||
// If the field is not the first, it's probably
|
||||
// being misused (a)
|
||||
if ctr > 0 {
|
||||
cx.span_lint(INHERITANCE_INTEGRITY, f.span,
|
||||
"Bare DOM structs should only be used as the first field of a \
|
||||
DOM struct. Consider using JS<T> instead.");
|
||||
}
|
||||
return Some(f.span)
|
||||
}
|
||||
}
|
||||
}
|
||||
None
|
||||
}).collect();
|
||||
|
||||
// We should not have both a reflector and a dom struct field
|
||||
if let Some(sp) = reflector_span {
|
||||
if dom_spans.len() > 0 {
|
||||
cx.span_lint(INHERITANCE_INTEGRITY, cx.tcx.map.expect_item(id).span,
|
||||
"This DOM struct has both Reflector and bare DOM struct members");
|
||||
if cx.current_level(INHERITANCE_INTEGRITY) != Level::Allow {
|
||||
let sess = cx.sess();
|
||||
sess.span_note(sp, "Reflector found here");
|
||||
for span in dom_spans.iter() {
|
||||
sess.span_note(*span, "Bare DOM struct found here");
|
||||
}
|
||||
}
|
||||
}
|
||||
// Nor should we have more than one dom struct field
|
||||
} else if dom_spans.len() > 1 {
|
||||
cx.span_lint(INHERITANCE_INTEGRITY, cx.tcx.map.expect_item(id).span,
|
||||
"This DOM struct has multiple DOM struct members, only one is allowed");
|
||||
if cx.current_level(INHERITANCE_INTEGRITY) != Level::Allow {
|
||||
for span in dom_spans.iter() {
|
||||
cx.sess().span_note(*span, "Bare DOM struct found here");
|
||||
}
|
||||
}
|
||||
} else if dom_spans.len() == 0 {
|
||||
cx.span_lint(INHERITANCE_INTEGRITY, cx.tcx.map.expect_item(id).span,
|
||||
"This DOM struct has no reflector or parent DOM struct");
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue