diff options
author | Lars Knoll <lars.knoll@qt.io> | 2018-09-19 15:27:41 +0200 |
---|---|---|
committer | Lars Knoll <lars.knoll@qt.io> | 2018-09-27 08:34:10 +0000 |
commit | 7c592625032a98f68fd6a09026e466c5fbc7bb09 (patch) | |
tree | 4ab9182d3b1468941226652ad0816e1f0c00e66b /src | |
parent | 9df44b2b502f9ab9a379c8454b000d2085aed744 (diff) |
Unify layout of function objects
Ensure we have the proto property at always the same place.
This will be used in a subsequent commit to optimize accesses
to the prototype property e.g. when doing instanceof
operations or constructor calls.
Change-Id: I6e9a19e0b7d0e8ab583648a60d1978f5cf838b06
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>
Diffstat (limited to 'src')
-rw-r--r-- | src/qml/jsruntime/qv4engine.cpp | 18 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4functionobject_p.h | 9 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4managed_p.h | 4 |
3 files changed, 19 insertions, 12 deletions
diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp index 4c1e660429..522ad7669f 100644 --- a/src/qml/jsruntime/qv4engine.cpp +++ b/src/qml/jsruntime/qv4engine.cpp @@ -351,23 +351,29 @@ ExecutionEngine::ExecutionEngine(QJSEngine *jsEngine) jsObjects[FunctionProto] = memoryManager->allocObject<FunctionPrototype>(ic->d()); ic = newInternalClass(FunctionObject::staticVTable(), functionPrototype()); classes[Class_FunctionObject] = ic->d(); + // Add an invalid prototype slot, so that all function objects have the same layout + // This helps speed up instanceof operations and other things where we need to query + // prototype property (as we always know it's location) + ic = ic->addMember(id_prototype()->propertyKey(), Attr_Invalid, index); + Q_ASSERT(index->index == Heap::FunctionObject::Index_Prototype); ic = ic->addMember(id_name()->propertyKey(), Attr_ReadOnly, index); Q_ASSERT(index->index == Heap::ArrowFunction::Index_Name); ic = ic->addMember(id_length()->propertyKey(), Attr_ReadOnly_ButConfigurable, index); Q_ASSERT(index->index == Heap::ArrowFunction::Index_Length); classes[Class_ArrowFunction] = ic->changeVTable(ArrowFunction::staticVTable()); - ic = ic->changeVTable(ScriptFunction::staticVTable()); - classes[Class_ScriptFunction] = ic->d(); - ic = ic->changeVTable(ConstructorFunction::staticVTable()); - classes[Class_ConstructorFunction] = ic->d(); ic = ic->changeVTable(MemberFunction::staticVTable()); classes[Class_MemberFunction] = ic->d(); ic = ic->changeVTable(GeneratorFunction::staticVTable()); - classes[Class_MemberFunction] = ic->d(); - ic = ic->changeVTable(GeneratorFunction::staticVTable()); classes[Class_GeneratorFunction] = ic->d(); ic = ic->changeVTable(MemberGeneratorFunction::staticVTable()); classes[Class_MemberGeneratorFunction] = ic->d(); + + ic = ic->changeMember(id_prototype()->propertyKey(), Attr_NotConfigurable|Attr_NotEnumerable); + ic = ic->changeVTable(ScriptFunction::staticVTable()); + classes[Class_ScriptFunction] = ic->d(); + ic = ic->changeVTable(ConstructorFunction::staticVTable()); + classes[Class_ConstructorFunction] = ic->d(); + classes[Class_ObjectProto] = classes[Class_Object]->addMember(id_constructor()->propertyKey(), Attr_NotEnumerable, index); Q_ASSERT(index->index == Heap::FunctionObject::Index_ProtoConstructor); diff --git a/src/qml/jsruntime/qv4functionobject_p.h b/src/qml/jsruntime/qv4functionobject_p.h index 11ddd9a211..8a2c84a8f6 100644 --- a/src/qml/jsruntime/qv4functionobject_p.h +++ b/src/qml/jsruntime/qv4functionobject_p.h @@ -76,7 +76,8 @@ namespace Heap { DECLARE_HEAP_OBJECT(FunctionObject, Object) { DECLARE_MARKOBJECTS(FunctionObject); enum { - Index_ProtoConstructor = 0 + Index_ProtoConstructor = 0, + Index_Prototype = 0 }; bool isConstructor() const { @@ -111,7 +112,7 @@ struct IndexedBuiltinFunction : FunctionObject { struct ArrowFunction : FunctionObject { enum { - Index_Name, + Index_Name = Index_Prototype + 1, Index_Length }; void init(QV4::ExecutionContext *scope, Function *function, QV4::String *name = nullptr); @@ -122,10 +123,6 @@ struct ArrowFunction : FunctionObject { DECLARE_HEAP_OBJECT(ScriptFunction, ArrowFunction) { DECLARE_MARKOBJECTS(ScriptFunction) - enum { - Index_Name, - Index_Length - }; void init(QV4::ExecutionContext *scope, Function *function); }; diff --git a/src/qml/jsruntime/qv4managed_p.h b/src/qml/jsruntime/qv4managed_p.h index 0ca921b98a..d85b30a056 100644 --- a/src/qml/jsruntime/qv4managed_p.h +++ b/src/qml/jsruntime/qv4managed_p.h @@ -233,6 +233,10 @@ struct InternalClass : Managed return d()->addMember(identifier, data, entry); } + Q_REQUIRED_RESULT Heap::InternalClass *changeMember(PropertyKey identifier, PropertyAttributes data, InternalClassEntry *entry = nullptr) { + return d()->changeMember(identifier, data, entry); + } + void operator =(Heap::InternalClass *ic) { Value::operator=(ic); } |