Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-08-06 14:10:11 +01:00
Code Issues Projects Releases Packages Wiki Activity

style: Simplify a bit our generated bindings by getting rid of FooBorrowed and FooBorrowedMut.

Browse source 
This reduces a lot the boilerplate that's needed in order to add simple binding
functions.

This starts using &Foo and Option<&Foo> instead, and as a result we need to
remove the servo_function_signatures test, which is a bit unfortunate.

I think it's worth though, this causes problems on some platforms (see bug
1534844), and messing up the functions signature is not something that I've ever
seen (other than bug 1308234, which already had all the FooBorrowed mess which
I'm removing).

Also, cbindgen understands references and Option<&Foo>, so it will be the way to
go in the future.

After this patch we can also remove HasSimpleFFI, but I've kept it for now since
I still use it in a few places, and this patch is quite big on its own.

Differential Revision: https://phabricator.services.mozilla.com/D24092
This commit is contained in:
Emilio Cobos Álvarez 2019-03-21 17:00:27 +00:00
parent d4635f1d12
commit 14b176019c
9 changed files with 68 additions and 150 deletions
Download patch file Download diff file Expand all files Collapse all files

2
components/style/author_styles.rs
View file

@ -77,7 +77,7 @@ where
#[cfg(feature = "gecko")]
unsafe impl HasFFI for AuthorStyles<crate::gecko::data::GeckoStyleSheet> {
type FFIType = crate::gecko_bindings::bindings::RawServoAuthorStyles;
type FFIType = crate::gecko_bindings::structs::RawServoAuthorStyles;
}
#[cfg(feature = "gecko")]
unsafe impl HasSimpleFFI for AuthorStyles<crate::gecko::data::GeckoStyleSheet> {}

97
components/style/build_gecko.rs
View file

@ -128,9 +128,6 @@ mod bindings {
trait BuilderExt {
fn get_initial_builder() -> Builder;
fn include<T: Into<String>>(self, file: T) -> Builder;
fn zero_size_type(self, ty: &str, structs_list: &HashSet<&str>) -> Builder;
fn borrowed_type(self, ty: &str) -> Builder;
fn mutable_borrowed_type(self, ty: &str) -> Builder;
}
impl BuilderExt for Builder {
@ -181,42 +178,6 @@ mod bindings {
fn include<T: Into<String>>(self, file: T) -> Builder {
self.clang_arg("-include").clang_arg(file)
}
// This makes an FFI-safe void type that can't be matched on
// &VoidType is UB to have, because you can match on it
// to produce a reachable unreachable. If it's wrapped in
// a struct as a private field it becomes okay again
//
// Not 100% sure of how safe this is, but it's what we're using
// in the XPCOM ffi too
// https://github.com/nikomatsakis/rust-memory-model/issues/2
fn zero_size_type(self, ty: &str, structs_list: &HashSet<&str>) -> Builder {
if !structs_list.contains(ty) {
self.blacklist_type(ty)
.raw_line(format!("enum {}Void {{ }}", ty))
.raw_line(format!("pub struct {0}({0}Void);", ty))
} else {
self
}
}
fn borrowed_type(self, ty: &str) -> Builder {
self.blacklist_type(format!("{}Borrowed", ty))
.raw_line(format!("pub type {0}Borrowed<'a> = &'a {0};", ty))
.blacklist_type(format!("{}BorrowedOrNull", ty))
.raw_line(format!(
"pub type {0}BorrowedOrNull<'a> = Option<&'a {0}>;",
ty
))
}
fn mutable_borrowed_type(self, ty: &str) -> Builder {
self.borrowed_type(ty)
.blacklist_type(format!("{}BorrowedMut", ty))
.raw_line(format!("pub type {0}BorrowedMut<'a> = &'a mut {0};", ty))
.blacklist_type(format!("{}BorrowedMutOrNull", ty))
.raw_line(format!(
"pub type {0}BorrowedMutOrNull<'a> = Option<&'a mut {0}>;",
ty
))
}
}
struct Fixup {
@ -290,13 +251,6 @@ mod bindings {
.collect()
}
fn get_borrowed_types() -> Vec<(bool, String)> {
get_types("BorrowedTypeList.h", "GECKO_BORROWED_TYPE(?:_MUT)?")
.into_iter()
.map(|(macro_name, type_name)| (macro_name.ends_with("MUT"), type_name))
.collect()
}
fn get_arc_types() -> Vec<String> {
get_types("ServoArcTypeList.h", "SERVO_ARC_TYPE")
.into_iter()
@ -480,67 +434,24 @@ mod bindings {
}
}
// FIXME(emilio): Avoid this altogether.
fn generate_bindings() {
let builder = Builder::get_initial_builder()
.disable_name_namespacing()
.with_codegen_config(CodegenConfig::FUNCTIONS);
let config = CONFIG["bindings"].as_table().unwrap();
let mut structs_types = HashSet::new();
let mut fixups = vec![];
let mut builder = BuilderWithConfig::new(builder, config)
.handle_common(&mut fixups)
.handle_str_items("whitelist-functions", |b, item| b.whitelist_function(item))
.handle_str_items("structs-types", |mut builder, ty| {
builder = builder
.blacklist_type(ty)
.raw_line(format!("use gecko_bindings::structs::{};", ty));
structs_types.insert(ty);
// TODO this is hacky, figure out a better way to do it without
// hardcoding everything...
if ty.starts_with("nsStyle") {
builder = builder
.raw_line(format!("unsafe impl Send for {} {{}}", ty))
.raw_line(format!("unsafe impl Sync for {} {{}}", ty));
}
builder
})
// TODO This was added due to servo/rust-bindgen#75, but
// that has been fixed in clang 4.0+. When we switch people
// to libclang 4.0, we can remove this.
.handle_table_items("array-types", |builder, item| {
let cpp_type = item["cpp-type"].as_str().unwrap();
let rust_type = item["rust-type"].as_str().unwrap();
builder.raw_line(format!(
concat!(
"pub type nsTArrayBorrowed_{}<'a> = ",
"&'a mut ::gecko_bindings::structs::nsTArray<{}>;"
),
cpp_type, rust_type
))
})
.handle_str_items("servo-immutable-borrow-types", |b, ty| b.borrowed_type(ty))
// Right now the only immutable borrow types are ones which we import
// from the |structs| module. As such, we don't need to create an opaque
// type with zero_size_type. If we ever introduce immutable borrow types
// which _do_ need to be opaque, we'll need a separate mode.
.handle_str_items("servo-borrow-types", |b, ty| b.mutable_borrowed_type(ty))
.get_builder();
for (is_mut, ty) in get_borrowed_types().iter() {
if *is_mut {
builder = builder.mutable_borrowed_type(ty);
} else {
builder = builder.borrowed_type(ty);
}
}
for ty in get_arc_types().iter() {
builder = builder
.blacklist_type(format!("{}Strong", ty))
.raw_line(format!(
"pub type {0}Strong = ::gecko_bindings::sugar::ownership::Strong<{0}>;",
ty
))
.borrowed_type(ty)
.zero_size_type(ty, &structs_types);
));
}
for ty in get_boxed_types().iter() {
builder = builder
@ -556,9 +467,7 @@ mod bindings {
"::gecko_bindings::sugar::ownership::OwnedOrNull<{0}>;"
),
ty
))
.mutable_borrowed_type(ty)
.zero_size_type(ty, &structs_types);
));
}
write_binding_file(builder, BINDINGS_FILE, &fixups);
}

26
components/style/gecko/arc_types.rs
View file

@ -9,19 +9,19 @@
#![allow(non_snake_case, missing_docs)]
use crate::gecko::url::CssUrlData;
use crate::gecko_bindings::bindings::RawServoCounterStyleRule;
use crate::gecko_bindings::bindings::RawServoFontFeatureValuesRule;
use crate::gecko_bindings::bindings::RawServoImportRule;
use crate::gecko_bindings::bindings::RawServoKeyframe;
use crate::gecko_bindings::bindings::RawServoKeyframesRule;
use crate::gecko_bindings::bindings::RawServoMediaRule;
use crate::gecko_bindings::bindings::RawServoMozDocumentRule;
use crate::gecko_bindings::bindings::RawServoNamespaceRule;
use crate::gecko_bindings::bindings::RawServoPageRule;
use crate::gecko_bindings::bindings::RawServoRuleNode;
use crate::gecko_bindings::bindings::RawServoRuleNodeStrong;
use crate::gecko_bindings::bindings::RawServoSupportsRule;
use crate::gecko_bindings::bindings::ServoCssRules;
use crate::gecko_bindings::structs::RawServoCounterStyleRule;
use crate::gecko_bindings::structs::RawServoFontFeatureValuesRule;
use crate::gecko_bindings::structs::RawServoImportRule;
use crate::gecko_bindings::structs::RawServoKeyframe;
use crate::gecko_bindings::structs::RawServoKeyframesRule;
use crate::gecko_bindings::structs::RawServoMediaRule;
use crate::gecko_bindings::structs::RawServoMozDocumentRule;
use crate::gecko_bindings::structs::RawServoNamespaceRule;
use crate::gecko_bindings::structs::RawServoPageRule;
use crate::gecko_bindings::structs::RawServoRuleNode;
use crate::gecko_bindings::structs::RawServoRuleNodeStrong;
use crate::gecko_bindings::structs::RawServoSupportsRule;
use crate::gecko_bindings::structs::ServoCssRules;
use crate::gecko_bindings::structs::RawServoAnimationValue;
use crate::gecko_bindings::structs::RawServoCssUrlData;
use crate::gecko_bindings::structs::RawServoDeclarationBlock;

18
components/style/gecko/conversions.rs
View file

@ -12,8 +12,7 @@
use crate::gecko::values::GeckoStyleCoordConvertible;
use crate::gecko_bindings::bindings;
use crate::gecko_bindings::structs::RawGeckoGfxMatrix4x4;
use crate::gecko_bindings::structs::{self, nsStyleCoord_CalcValue};
use crate::gecko_bindings::structs::{self, nsStyleCoord_CalcValue, Matrix4x4Components};
use crate::gecko_bindings::structs::{nsStyleImage, nsresult, SheetType};
use crate::gecko_bindings::sugar::ns_style_coord::{CoordData, CoordDataMut, CoordDataValue};
use crate::stylesheets::{Origin, RulesMutateError};
@ -986,8 +985,8 @@ pub unsafe fn string_from_chars_pointer(p: *const u16) -> String {
String::from_utf16_lossy(char_vec)
}
impl<'a> From<&'a RawGeckoGfxMatrix4x4> for Matrix3D {
fn from(m: &'a RawGeckoGfxMatrix4x4) -> Matrix3D {
impl<'a> From<&'a Matrix4x4Components> for Matrix3D {
fn from(m: &'a Matrix4x4Components) -> Matrix3D {
Matrix3D {
m11: m[0],
m12: m[1],
@ -1009,12 +1008,13 @@ impl<'a> From<&'a RawGeckoGfxMatrix4x4> for Matrix3D {
}
}
impl From<Matrix3D> for RawGeckoGfxMatrix4x4 {
fn from(matrix: Matrix3D) -> RawGeckoGfxMatrix4x4 {
impl From<Matrix3D> for Matrix4x4Components {
fn from(matrix: Matrix3D) -> Self {
[
matrix.m11, matrix.m12, matrix.m13, matrix.m14, matrix.m21, matrix.m22, matrix.m23,
matrix.m24, matrix.m31, matrix.m32, matrix.m33, matrix.m34, matrix.m41, matrix.m42,
matrix.m43, matrix.m44,
matrix.m11, matrix.m12, matrix.m13, matrix.m14, matrix.m21,
matrix.m22, matrix.m23, matrix.m24, matrix.m31, matrix.m32,
matrix.m33, matrix.m34, matrix.m41, matrix.m42, matrix.m43,
matrix.m44,
]
}
}

4
components/style/gecko/data.rs
View file

@ -6,8 +6,8 @@
use crate::context::QuirksMode;
use crate::dom::TElement;
use crate::gecko_bindings::bindings::{self, RawServoStyleSet};
use crate::gecko_bindings::structs::{self, ServoStyleSetSizes};
use crate::gecko_bindings::bindings;
use crate::gecko_bindings::structs::{self, RawServoStyleSet, ServoStyleSetSizes};
use crate::gecko_bindings::structs::{StyleSheet as DomStyleSheet, StyleSheetInfo};
use crate::gecko_bindings::sugar::ownership::{HasArcFFI, HasBoxFFI, HasFFI, HasSimpleFFI};
use crate::invalidation::media_queries::{MediaListKey, ToMediaListKey};

4
components/style/gecko/restyle_damage.rs
View file

@ -51,8 +51,8 @@ impl GeckoRestyleDamage {
let mut reset_only = false;
let hint = unsafe {
bindings::Gecko_CalcStyleDifference(
old_style,
new_style,
old_style.as_gecko_computed_style(),
new_style.as_gecko_computed_style(),
&mut any_style_changed,
&mut reset_only,
)

46
components/style/gecko/wrapper.rs
View file

@ -53,7 +53,7 @@ use crate::gecko_bindings::structs::ELEMENT_HAS_SNAPSHOT;
use crate::gecko_bindings::structs::NODE_DESCENDANTS_NEED_FRAMES;
use crate::gecko_bindings::structs::NODE_NEEDS_FRAME;
use crate::gecko_bindings::structs::{nsAtom, nsIContent, nsINode_BooleanFlag};
use crate::gecko_bindings::structs::{RawGeckoElement, RawGeckoNode, RawGeckoXBLBinding};
use crate::gecko_bindings::structs::{Element as RawGeckoElement, nsINode as RawGeckoNode, nsXBLBinding as RawGeckoXBLBinding};
use crate::gecko_bindings::sugar::ownership::{HasArcFFI, HasSimpleFFI};
use crate::global_style_data::GLOBAL_STYLE_DATA;
use crate::hash::FxHashMap;
@ -168,11 +168,7 @@ impl<'lr> TShadowRoot for GeckoShadowRoot<'lr> {
where
Self: 'a,
{
let author_styles = unsafe {
(self.0.mServoStyles.mPtr as *const structs::RawServoAuthorStyles
as *const bindings::RawServoAuthorStyles)
.as_ref()?
};
let author_styles = unsafe { self.0.mServoStyles.mPtr.as_ref()? };
let author_styles = AuthorStyles::<GeckoStyleSheet>::from_ffi(author_styles);
@ -325,7 +321,7 @@ impl<'ln> GeckoNode<'ln> {
// `flattened_tree_parent`.
if self.flattened_tree_parent_is_parent() {
debug_assert_eq!(
unsafe { bindings::Gecko_GetFlattenedTreeParentNode(self.0).map(GeckoNode) },
unsafe { bindings::Gecko_GetFlattenedTreeParentNode(self.0).as_ref().map(GeckoNode) },
self.parent_node(),
"Fast path stopped holding!"
);
@ -335,7 +331,7 @@ impl<'ln> GeckoNode<'ln> {
// NOTE(emilio): If this call is too expensive, we could manually
// inline more aggressively.
unsafe { bindings::Gecko_GetFlattenedTreeParentNode(self.0).map(GeckoNode) }
unsafe { bindings::Gecko_GetFlattenedTreeParentNode(self.0).as_ref().map(GeckoNode) }
}
#[inline]
@ -380,12 +376,12 @@ impl<'ln> TNode for GeckoNode<'ln> {
#[inline]
fn last_child(&self) -> Option<Self> {
unsafe { bindings::Gecko_GetLastChild(self.0).map(GeckoNode) }
unsafe { bindings::Gecko_GetLastChild(self.0).as_ref().map(GeckoNode) }
}
#[inline]
fn prev_sibling(&self) -> Option<Self> {
unsafe { bindings::Gecko_GetPreviousSibling(self.0).map(GeckoNode) }
unsafe { bindings::Gecko_GetPreviousSibling(self.0).as_ref().map(GeckoNode) }
}
#[inline]
@ -502,7 +498,7 @@ impl<'a> Iterator for GeckoChildrenIterator<'a> {
// however we can't express this easily with bindgen, and it would
// introduce functions with two input lifetimes into bindgen,
// which would be out of scope for elision.
bindings::Gecko_GetNextStyleChild(&mut *(it as *mut _)).map(GeckoNode)
bindings::Gecko_GetNextStyleChild(&mut *(it as *mut _)).as_ref().map(GeckoNode)
},
}
}
@ -548,7 +544,7 @@ impl<'lb> GeckoXBLBinding<'lb> {
base.each_xbl_cascade_data(f);
}
let data = unsafe { bindings::Gecko_XBLBinding_GetRawServoStyles(self.0) };
let data = unsafe { bindings::Gecko_XBLBinding_GetRawServoStyles(self.0).as_ref() };
if let Some(data) = data {
let data: &'lb _ = AuthorStyles::<GeckoStyleSheet>::from_ffi(data);
@ -709,7 +705,7 @@ impl<'le> GeckoElement<'le> {
// FIXME(heycam): Having trouble with bindgen on nsXULElement,
// where the binding parent is stored in a member variable
// rather than in slots. So just get it through FFI for now.
unsafe { bindings::Gecko_GetBindingParent(self.0).map(GeckoElement) }
unsafe { bindings::Gecko_GetBindingParent(self.0).as_ref().map(GeckoElement) }
} else {
let binding_parent = unsafe { self.non_xul_xbl_binding_parent_raw_content().as_ref() }
.map(GeckoNode::from_content)
@ -717,7 +713,7 @@ impl<'le> GeckoElement<'le> {
debug_assert!(
binding_parent ==
unsafe { bindings::Gecko_GetBindingParent(self.0).map(GeckoElement) }
unsafe { bindings::Gecko_GetBindingParent(self.0).as_ref().map(GeckoElement) }
);
binding_parent
}
@ -777,7 +773,7 @@ impl<'le> GeckoElement<'le> {
return None;
}
unsafe { bindings::Gecko_GetBeforeOrAfterPseudo(self.0, is_before).map(GeckoElement) }
unsafe { bindings::Gecko_GetBeforeOrAfterPseudo(self.0, is_before).as_ref().map(GeckoElement) }
}
#[inline]
@ -887,7 +883,7 @@ impl<'le> GeckoElement<'le> {
let mut map = FxHashMap::with_capacity_and_hasher(collection_length, Default::default());
for i in 0..collection_length {
let raw_end_value = unsafe { Gecko_ElementTransitions_EndValueAt(self.0, i) };
let raw_end_value = unsafe { Gecko_ElementTransitions_EndValueAt(self.0, i).as_ref() };
let end_value = AnimationValue::arc_from_borrowed(&raw_end_value)
.expect("AnimationValue not found in ElementTransitions");
@ -1270,7 +1266,7 @@ impl<'le> TElement for GeckoElement<'le> {
return None;
}
let declarations = unsafe { Gecko_GetStyleAttrDeclarationBlock(self.0) };
let declarations = unsafe { Gecko_GetStyleAttrDeclarationBlock(self.0).as_ref() };
let declarations: Option<&RawOffsetArc<Locked<PropertyDeclarationBlock>>> =
declarations.and_then(|s| s.as_arc_opt());
declarations.map(|s| s.borrow_arc())
@ -1551,8 +1547,10 @@ impl<'le> TElement for GeckoElement<'le> {
// should destroy all CSS animations in display:none subtree.
let computed_data = self.borrow_data();
let computed_values = computed_data.as_ref().map(|d| d.styles.primary());
let before_change_values = before_change_style.as_ref().map(|x| &**x);
let computed_values_opt = computed_values.as_ref().map(|x| &***x);
let before_change_values =
before_change_style.as_ref().map_or(ptr::null(), |x| x.as_gecko_computed_style());
let computed_values_opt =
computed_values.as_ref().map_or(ptr::null(), |x| x.as_gecko_computed_style());
unsafe {
Gecko_UpdateAnimations(
self.0,
@ -1828,7 +1826,7 @@ impl<'le> TElement for GeckoElement<'le> {
hints.push(SVG_TEXT_DISABLE_ZOOM_RULE.clone());
}
}
let declarations = unsafe { Gecko_GetHTMLPresentationAttrDeclarationBlock(self.0) };
let declarations = unsafe { Gecko_GetHTMLPresentationAttrDeclarationBlock(self.0).as_ref() };
let declarations: Option<&RawOffsetArc<Locked<PropertyDeclarationBlock>>> =
declarations.and_then(|s| s.as_arc_opt());
if let Some(decl) = declarations {
@ -1837,7 +1835,7 @@ impl<'le> TElement for GeckoElement<'le> {
ServoCascadeLevel::PresHints,
));
}
let declarations = unsafe { Gecko_GetExtraContentStyleDeclarations(self.0) };
let declarations = unsafe { Gecko_GetExtraContentStyleDeclarations(self.0).as_ref() };
let declarations: Option<&RawOffsetArc<Locked<PropertyDeclarationBlock>>> =
declarations.and_then(|s| s.as_arc_opt());
if let Some(decl) = declarations {
@ -1859,10 +1857,10 @@ impl<'le> TElement for GeckoElement<'le> {
);
},
VisitedHandlingMode::AllLinksUnvisited => unsafe {
Gecko_GetUnvisitedLinkAttrDeclarationBlock(self.0)
Gecko_GetUnvisitedLinkAttrDeclarationBlock(self.0).as_ref()
},
VisitedHandlingMode::RelevantLinkVisited => unsafe {
Gecko_GetVisitedLinkAttrDeclarationBlock(self.0)
Gecko_GetVisitedLinkAttrDeclarationBlock(self.0).as_ref()
},
};
let declarations: Option<&RawOffsetArc<Locked<PropertyDeclarationBlock>>> =
@ -1878,7 +1876,7 @@ impl<'le> TElement for GeckoElement<'le> {
.state()
.intersects(NonTSPseudoClass::Active.state_flag());
if active {
let declarations = unsafe { Gecko_GetActiveLinkAttrDeclarationBlock(self.0) };
let declarations = unsafe { Gecko_GetActiveLinkAttrDeclarationBlock(self.0).as_ref() };
let declarations: Option<&RawOffsetArc<Locked<PropertyDeclarationBlock>>> =
declarations.and_then(|s| s.as_arc_opt());
if let Some(decl) = declarations {

2
components/style/gecko_bindings/sugar/refptr.rs
View file

@ -285,7 +285,7 @@ macro_rules! impl_threadsafe_refcount {
}
impl_threadsafe_refcount!(
structs::RawGeckoURLExtraData,
structs::mozilla::URLExtraData,
bindings::Gecko_AddRefURLExtraDataArbitraryThread,
bindings::Gecko_ReleaseURLExtraDataArbitraryThread
);

19
components/style/properties/gecko.mako.rs
View file

@ -66,16 +66,25 @@ use crate::values::generics::url::UrlOrNone;
pub mod style_structs {
% for style_struct in data.style_structs:
pub use super::${style_struct.gecko_struct_name} as ${style_struct.name};
unsafe impl Send for ${style_struct.name} {}
unsafe impl Sync for ${style_struct.name} {}
% endfor
}
/// FIXME(emilio): This is completely duplicated with the other properties code.
pub type ComputedValuesInner = crate::gecko_bindings::structs::ServoComputedData;
pub type ComputedValuesInner = structs::ServoComputedData;
#[repr(C)]
pub struct ComputedValues(crate::gecko_bindings::structs::mozilla::ComputedStyle);
pub struct ComputedValues(structs::mozilla::ComputedStyle);
impl ComputedValues {
#[inline]
pub (crate) fn as_gecko_computed_style(&self) -> &structs::ComputedStyle {
&self.0
}
pub fn new(
pseudo: Option<<&PseudoElement>,
custom_properties: Option<Arc<CustomPropertiesMap>>,
@ -929,7 +938,7 @@ transform_functions = [
debug_assert!(!${item}${index + 1}.0.is_empty());
% endif
${css_value_setters[item] % (
"bindings::Gecko_CSSValue_GetArrayItem(gecko_value, %d)" % (index + 1),
"(&mut *bindings::Gecko_CSSValue_GetArrayItem(gecko_value, %d))" % (index + 1),
item + str(index + 1)
)};
% endfor
@ -980,7 +989,7 @@ transform_functions = [
% endif
<%
getter = css_value_getters[item] % (
"bindings::Gecko_CSSValue_GetArrayItemConst(gecko_value, %d)" % (index + 1)
"(&*bindings::Gecko_CSSValue_GetArrayItemConst(gecko_value, %d))" % (index + 1)
)
%>
${getter},
@ -989,6 +998,7 @@ transform_functions = [
},
</%def>
#[allow(unused_parens)]
fn set_single_transform_function(
servo_value: &values::computed::TransformOperation,
gecko_value: &mut structs::nsCSSValue /* output */
@ -1031,6 +1041,7 @@ pub fn convert_transform(
output.set_move(list);
}
#[allow(unused_parens)]
fn clone_single_transform_function(
gecko_value: &structs::nsCSSValue
) -> values::computed::TransformOperation {