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accessors.cc
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accessors.cc
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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/accessors.h"
#include "src/api.h"
#include "src/contexts.h"
#include "src/deoptimizer.h"
#include "src/execution.h"
#include "src/factory.h"
#include "src/frames-inl.h"
#include "src/isolate-inl.h"
#include "src/messages.h"
#include "src/property-details.h"
#include "src/prototype.h"
namespace v8 {
namespace internal {
Handle<AccessorInfo> Accessors::MakeAccessor(
Isolate* isolate, Handle<Name> name, AccessorNameGetterCallback getter,
AccessorNameBooleanSetterCallback setter) {
Factory* factory = isolate->factory();
Handle<AccessorInfo> info = factory->NewAccessorInfo();
info->set_all_can_read(false);
info->set_all_can_write(false);
info->set_is_special_data_property(true);
info->set_is_sloppy(false);
info->set_replace_on_access(false);
name = factory->InternalizeName(name);
info->set_name(*name);
Handle<Object> get = v8::FromCData(isolate, getter);
if (setter == nullptr) setter = &ReconfigureToDataProperty;
Handle<Object> set = v8::FromCData(isolate, setter);
info->set_getter(*get);
info->set_setter(*set);
Address redirected = info->redirected_getter();
if (redirected != nullptr) {
Handle<Object> js_get = v8::FromCData(isolate, redirected);
info->set_js_getter(*js_get);
}
return info;
}
static V8_INLINE bool CheckForName(Handle<Name> name,
Handle<String> property_name, int offset,
FieldIndex::Encoding encoding,
FieldIndex* index) {
if (Name::Equals(name, property_name)) {
*index = FieldIndex::ForInObjectOffset(offset, encoding);
return true;
}
return false;
}
// Returns true for properties that are accessors to object fields.
// If true, *object_offset contains offset of object field.
bool Accessors::IsJSObjectFieldAccessor(Handle<Map> map, Handle<Name> name,
FieldIndex* index) {
Isolate* isolate = name->GetIsolate();
switch (map->instance_type()) {
case JS_ARRAY_TYPE:
return CheckForName(name, isolate->factory()->length_string(),
JSArray::kLengthOffset, FieldIndex::kTagged, index);
default:
if (map->instance_type() < FIRST_NONSTRING_TYPE) {
return CheckForName(name, isolate->factory()->length_string(),
String::kLengthOffset, FieldIndex::kTagged, index);
}
return false;
}
}
namespace {
MUST_USE_RESULT MaybeHandle<Object> ReplaceAccessorWithDataProperty(
Isolate* isolate, Handle<Object> receiver, Handle<JSObject> holder,
Handle<Name> name, Handle<Object> value) {
LookupIterator it(receiver, name, holder,
LookupIterator::OWN_SKIP_INTERCEPTOR);
// Skip any access checks we might hit. This accessor should never hit in a
// situation where the caller does not have access.
if (it.state() == LookupIterator::ACCESS_CHECK) {
CHECK(it.HasAccess());
it.Next();
}
DCHECK(holder.is_identical_to(it.GetHolder<JSObject>()));
CHECK_EQ(LookupIterator::ACCESSOR, it.state());
it.ReconfigureDataProperty(value, it.property_attributes());
return value;
}
} // namespace
void Accessors::ReconfigureToDataProperty(
v8::Local<v8::Name> key, v8::Local<v8::Value> val,
const v8::PropertyCallbackInfo<v8::Boolean>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
RuntimeCallTimerScope stats_scope(
isolate, &RuntimeCallStats::ReconfigureToDataProperty);
HandleScope scope(isolate);
Handle<Object> receiver = Utils::OpenHandle(*info.This());
Handle<JSObject> holder =
Handle<JSObject>::cast(Utils::OpenHandle(*info.Holder()));
Handle<Name> name = Utils::OpenHandle(*key);
Handle<Object> value = Utils::OpenHandle(*val);
MaybeHandle<Object> result =
ReplaceAccessorWithDataProperty(isolate, receiver, holder, name, value);
if (result.is_null()) {
isolate->OptionalRescheduleException(false);
} else {
info.GetReturnValue().Set(true);
}
}
//
// Accessors::ArgumentsIterator
//
void Accessors::ArgumentsIteratorGetter(
v8::Local<v8::Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* result = isolate->native_context()->array_values_iterator();
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(result, isolate)));
}
Handle<AccessorInfo> Accessors::MakeArgumentsIteratorInfo(Isolate* isolate) {
Handle<Name> name = isolate->factory()->iterator_symbol();
return MakeAccessor(isolate, name, &ArgumentsIteratorGetter, nullptr);
}
//
// Accessors::ArrayLength
//
void Accessors::ArrayLengthGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::ArrayLengthGetter);
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
JSArray* holder = JSArray::cast(*Utils::OpenHandle(*info.Holder()));
Object* result = holder->length();
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(result, isolate)));
}
void Accessors::ArrayLengthSetter(
v8::Local<v8::Name> name, v8::Local<v8::Value> val,
const v8::PropertyCallbackInfo<v8::Boolean>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::ArrayLengthSetter);
HandleScope scope(isolate);
DCHECK(Utils::OpenHandle(*name)->SameValue(isolate->heap()->length_string()));
Handle<JSReceiver> object = Utils::OpenHandle(*info.Holder());
Handle<JSArray> array = Handle<JSArray>::cast(object);
Handle<Object> length_obj = Utils::OpenHandle(*val);
bool was_readonly = JSArray::HasReadOnlyLength(array);
uint32_t length = 0;
if (!JSArray::AnythingToArrayLength(isolate, length_obj, &length)) {
isolate->OptionalRescheduleException(false);
return;
}
if (!was_readonly && V8_UNLIKELY(JSArray::HasReadOnlyLength(array)) &&
length != array->length()->Number()) {
// AnythingToArrayLength() may have called setter re-entrantly and modified
// its property descriptor. Don't perform this check if "length" was
// previously readonly, as this may have been called during
// DefineOwnPropertyIgnoreAttributes().
if (info.ShouldThrowOnError()) {
Factory* factory = isolate->factory();
isolate->Throw(*factory->NewTypeError(
MessageTemplate::kStrictReadOnlyProperty, Utils::OpenHandle(*name),
i::Object::TypeOf(isolate, object), object));
isolate->OptionalRescheduleException(false);
} else {
info.GetReturnValue().Set(false);
}
return;
}
JSArray::SetLength(array, length);
uint32_t actual_new_len = 0;
CHECK(array->length()->ToArrayLength(&actual_new_len));
// Fail if there were non-deletable elements.
if (actual_new_len != length) {
if (info.ShouldThrowOnError()) {
Factory* factory = isolate->factory();
isolate->Throw(*factory->NewTypeError(
MessageTemplate::kStrictDeleteProperty,
factory->NewNumberFromUint(actual_new_len - 1), array));
isolate->OptionalRescheduleException(false);
} else {
info.GetReturnValue().Set(false);
}
} else {
info.GetReturnValue().Set(true);
}
}
Handle<AccessorInfo> Accessors::MakeArrayLengthInfo(Isolate* isolate) {
return MakeAccessor(isolate, isolate->factory()->length_string(),
&ArrayLengthGetter, &ArrayLengthSetter);
}
//
// Accessors::ModuleNamespaceEntry
//
void Accessors::ModuleNamespaceEntryGetter(
v8::Local<v8::Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
HandleScope scope(isolate);
JSModuleNamespace* holder =
JSModuleNamespace::cast(*Utils::OpenHandle(*info.Holder()));
Handle<Object> result;
if (!holder->GetExport(Handle<String>::cast(Utils::OpenHandle(*name)))
.ToHandle(&result)) {
isolate->OptionalRescheduleException(false);
} else {
info.GetReturnValue().Set(Utils::ToLocal(result));
}
}
void Accessors::ModuleNamespaceEntrySetter(
v8::Local<v8::Name> name, v8::Local<v8::Value> val,
const v8::PropertyCallbackInfo<v8::Boolean>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
HandleScope scope(isolate);
Factory* factory = isolate->factory();
Handle<JSModuleNamespace> holder =
Handle<JSModuleNamespace>::cast(Utils::OpenHandle(*info.Holder()));
if (info.ShouldThrowOnError()) {
isolate->Throw(*factory->NewTypeError(
MessageTemplate::kStrictReadOnlyProperty, Utils::OpenHandle(*name),
i::Object::TypeOf(isolate, holder), holder));
isolate->OptionalRescheduleException(false);
} else {
info.GetReturnValue().Set(false);
}
}
Handle<AccessorInfo> Accessors::MakeModuleNamespaceEntryInfo(
Isolate* isolate, Handle<String> name) {
return MakeAccessor(isolate, name, &ModuleNamespaceEntryGetter,
&ModuleNamespaceEntrySetter);
}
//
// Accessors::StringLength
//
void Accessors::StringLengthGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::StringLengthGetter);
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
// We have a slight impedance mismatch between the external API and the way we
// use callbacks internally: Externally, callbacks can only be used with
// v8::Object, but internally we have callbacks on entities which are higher
// in the hierarchy, in this case for String values.
Object* value = *Utils::OpenHandle(*v8::Local<v8::Value>(info.This()));
if (!value->IsString()) {
// Not a string value. That means that we either got a String wrapper or
// a Value with a String wrapper in its prototype chain.
value = JSValue::cast(*Utils::OpenHandle(*info.Holder()))->value();
}
Object* result = Smi::FromInt(String::cast(value)->length());
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(result, isolate)));
}
Handle<AccessorInfo> Accessors::MakeStringLengthInfo(Isolate* isolate) {
return MakeAccessor(isolate, isolate->factory()->length_string(),
&StringLengthGetter, nullptr);
}
//
// Accessors::ScriptColumnOffset
//
void Accessors::ScriptColumnOffsetGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* res = Smi::FromInt(
Script::cast(JSValue::cast(object)->value())->column_offset());
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(res, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptColumnOffsetInfo(Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("column_offset")));
return MakeAccessor(isolate, name, &ScriptColumnOffsetGetter, nullptr);
}
//
// Accessors::ScriptId
//
void Accessors::ScriptIdGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* id = Smi::FromInt(Script::cast(JSValue::cast(object)->value())->id());
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(id, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptIdInfo(Isolate* isolate) {
Handle<String> name(
isolate->factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("id")));
return MakeAccessor(isolate, name, &ScriptIdGetter, nullptr);
}
//
// Accessors::ScriptName
//
void Accessors::ScriptNameGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* source = Script::cast(JSValue::cast(object)->value())->name();
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(source, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptNameInfo(Isolate* isolate) {
return MakeAccessor(isolate, isolate->factory()->name_string(),
&ScriptNameGetter, nullptr);
}
//
// Accessors::ScriptSource
//
void Accessors::ScriptSourceGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* source = Script::cast(JSValue::cast(object)->value())->source();
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(source, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptSourceInfo(Isolate* isolate) {
return MakeAccessor(isolate, isolate->factory()->source_string(),
&ScriptSourceGetter, nullptr);
}
//
// Accessors::ScriptLineOffset
//
void Accessors::ScriptLineOffsetGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* res =
Smi::FromInt(Script::cast(JSValue::cast(object)->value())->line_offset());
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(res, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptLineOffsetInfo(Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("line_offset")));
return MakeAccessor(isolate, name, &ScriptLineOffsetGetter, nullptr);
}
//
// Accessors::ScriptType
//
void Accessors::ScriptTypeGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* res =
Smi::FromInt(Script::cast(JSValue::cast(object)->value())->type());
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(res, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptTypeInfo(Isolate* isolate) {
Handle<String> name(
isolate->factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("type")));
return MakeAccessor(isolate, name, &ScriptTypeGetter, nullptr);
}
//
// Accessors::ScriptCompilationType
//
void Accessors::ScriptCompilationTypeGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* res = Smi::FromInt(
Script::cast(JSValue::cast(object)->value())->compilation_type());
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(res, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptCompilationTypeInfo(
Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("compilation_type")));
return MakeAccessor(isolate, name, &ScriptCompilationTypeGetter, nullptr);
}
//
// Accessors::ScriptSourceUrl
//
void Accessors::ScriptSourceUrlGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* url = Script::cast(JSValue::cast(object)->value())->source_url();
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(url, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptSourceUrlInfo(Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("source_url")));
return MakeAccessor(isolate, name, &ScriptSourceUrlGetter, nullptr);
}
//
// Accessors::ScriptSourceMappingUrl
//
void Accessors::ScriptSourceMappingUrlGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* url =
Script::cast(JSValue::cast(object)->value())->source_mapping_url();
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(url, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptSourceMappingUrlInfo(
Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("source_mapping_url")));
return MakeAccessor(isolate, name, &ScriptSourceMappingUrlGetter, nullptr);
}
//
// Accessors::ScriptGetContextData
//
void Accessors::ScriptContextDataGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
DisallowHeapAllocation no_allocation;
HandleScope scope(isolate);
Object* object = *Utils::OpenHandle(*info.Holder());
Object* res = Script::cast(JSValue::cast(object)->value())->context_data();
info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(res, isolate)));
}
Handle<AccessorInfo> Accessors::MakeScriptContextDataInfo(Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("context_data")));
return MakeAccessor(isolate, name, &ScriptContextDataGetter, nullptr);
}
//
// Accessors::ScriptGetEvalFromScript
//
void Accessors::ScriptEvalFromScriptGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
HandleScope scope(isolate);
Handle<Object> object = Utils::OpenHandle(*info.Holder());
Handle<Script> script(
Script::cast(Handle<JSValue>::cast(object)->value()), isolate);
Handle<Object> result = isolate->factory()->undefined_value();
if (!script->eval_from_shared()->IsUndefined(isolate)) {
Handle<SharedFunctionInfo> eval_from_shared(
SharedFunctionInfo::cast(script->eval_from_shared()));
if (eval_from_shared->script()->IsScript()) {
Handle<Script> eval_from_script(Script::cast(eval_from_shared->script()));
result = Script::GetWrapper(eval_from_script);
}
}
info.GetReturnValue().Set(Utils::ToLocal(result));
}
Handle<AccessorInfo> Accessors::MakeScriptEvalFromScriptInfo(Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("eval_from_script")));
return MakeAccessor(isolate, name, &ScriptEvalFromScriptGetter, nullptr);
}
//
// Accessors::ScriptGetEvalFromScriptPosition
//
void Accessors::ScriptEvalFromScriptPositionGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
HandleScope scope(isolate);
Handle<Object> object = Utils::OpenHandle(*info.Holder());
Handle<Script> script(
Script::cast(Handle<JSValue>::cast(object)->value()), isolate);
Handle<Object> result = isolate->factory()->undefined_value();
if (script->compilation_type() == Script::COMPILATION_TYPE_EVAL) {
result = Handle<Object>(Smi::FromInt(script->GetEvalPosition()), isolate);
}
info.GetReturnValue().Set(Utils::ToLocal(result));
}
Handle<AccessorInfo> Accessors::MakeScriptEvalFromScriptPositionInfo(
Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("eval_from_script_position")));
return MakeAccessor(isolate, name, &ScriptEvalFromScriptPositionGetter,
nullptr);
}
//
// Accessors::ScriptGetEvalFromFunctionName
//
void Accessors::ScriptEvalFromFunctionNameGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
HandleScope scope(isolate);
Handle<Object> object = Utils::OpenHandle(*info.Holder());
Handle<Script> script(
Script::cast(Handle<JSValue>::cast(object)->value()), isolate);
Handle<Object> result = isolate->factory()->undefined_value();
if (!script->eval_from_shared()->IsUndefined(isolate)) {
Handle<SharedFunctionInfo> shared(
SharedFunctionInfo::cast(script->eval_from_shared()));
// Find the name of the function calling eval.
result = Handle<Object>(shared->name(), isolate);
}
info.GetReturnValue().Set(Utils::ToLocal(result));
}
Handle<AccessorInfo> Accessors::MakeScriptEvalFromFunctionNameInfo(
Isolate* isolate) {
Handle<String> name(isolate->factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("eval_from_function_name")));
return MakeAccessor(isolate, name, &ScriptEvalFromFunctionNameGetter,
nullptr);
}
//
// Accessors::FunctionPrototype
//
static Handle<Object> GetFunctionPrototype(Isolate* isolate,
Handle<JSFunction> function) {
if (!function->has_prototype()) {
Handle<Object> proto = isolate->factory()->NewFunctionPrototype(function);
JSFunction::SetPrototype(function, proto);
}
return Handle<Object>(function->prototype(), isolate);
}
void Accessors::FunctionPrototypeGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
RuntimeCallTimerScope timer(isolate,
&RuntimeCallStats::FunctionPrototypeGetter);
HandleScope scope(isolate);
Handle<JSFunction> function =
Handle<JSFunction>::cast(Utils::OpenHandle(*info.Holder()));
Handle<Object> result = GetFunctionPrototype(isolate, function);
info.GetReturnValue().Set(Utils::ToLocal(result));
}
void Accessors::FunctionPrototypeSetter(
v8::Local<v8::Name> name, v8::Local<v8::Value> val,
const v8::PropertyCallbackInfo<v8::Boolean>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
RuntimeCallTimerScope timer(isolate,
&RuntimeCallStats::FunctionPrototypeSetter);
HandleScope scope(isolate);
Handle<Object> value = Utils::OpenHandle(*val);
Handle<JSFunction> object =
Handle<JSFunction>::cast(Utils::OpenHandle(*info.Holder()));
JSFunction::SetPrototype(object, value);
info.GetReturnValue().Set(true);
}
Handle<AccessorInfo> Accessors::MakeFunctionPrototypeInfo(Isolate* isolate) {
return MakeAccessor(isolate, isolate->factory()->prototype_string(),
&FunctionPrototypeGetter, &FunctionPrototypeSetter);
}
//
// Accessors::FunctionLength
//
void Accessors::FunctionLengthGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::FunctionLengthGetter);
HandleScope scope(isolate);
Handle<JSFunction> function =
Handle<JSFunction>::cast(Utils::OpenHandle(*info.Holder()));
int length = 0;
if (!JSFunction::GetLength(isolate, function).To(&length)) {
isolate->OptionalRescheduleException(false);
}
Handle<Object> result(Smi::FromInt(length), isolate);
info.GetReturnValue().Set(Utils::ToLocal(result));
}
Handle<AccessorInfo> Accessors::MakeFunctionLengthInfo(Isolate* isolate) {
return MakeAccessor(isolate, isolate->factory()->length_string(),
&FunctionLengthGetter, &ReconfigureToDataProperty);
}
//
// Accessors::FunctionName
//
void Accessors::FunctionNameGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
HandleScope scope(isolate);
Handle<JSFunction> function =
Handle<JSFunction>::cast(Utils::OpenHandle(*info.Holder()));
Handle<Object> result = JSFunction::GetName(isolate, function);
info.GetReturnValue().Set(Utils::ToLocal(result));
}
Handle<AccessorInfo> Accessors::MakeFunctionNameInfo(Isolate* isolate) {
return MakeAccessor(isolate, isolate->factory()->name_string(),
&FunctionNameGetter, &ReconfigureToDataProperty);
}
//
// Accessors::FunctionArguments
//
static Handle<Object> ArgumentsForInlinedFunction(
JavaScriptFrame* frame,
Handle<JSFunction> inlined_function,
int inlined_frame_index) {
Isolate* isolate = inlined_function->GetIsolate();
Factory* factory = isolate->factory();
TranslatedState translated_values(frame);
translated_values.Prepare(frame->fp());
int argument_count = 0;
TranslatedFrame* translated_frame =
translated_values.GetArgumentsInfoFromJSFrameIndex(inlined_frame_index,
&argument_count);
TranslatedFrame::iterator iter = translated_frame->begin();
// Skip the function.
iter++;
// Skip the receiver.
iter++;
argument_count--;
Handle<JSObject> arguments =
factory->NewArgumentsObject(inlined_function, argument_count);
Handle<FixedArray> array = factory->NewFixedArray(argument_count);
bool should_deoptimize = false;
for (int i = 0; i < argument_count; ++i) {
// If we materialize any object, we should deoptimize the frame because we
// might alias an object that was eliminated by escape analysis.
should_deoptimize = should_deoptimize || iter->IsMaterializedObject();
Handle<Object> value = iter->GetValue();
array->set(i, *value);
iter++;
}
arguments->set_elements(*array);
if (should_deoptimize) {
translated_values.StoreMaterializedValuesAndDeopt(frame);
}
// Return the freshly allocated arguments object.
return arguments;
}
static int FindFunctionInFrame(JavaScriptFrame* frame,
Handle<JSFunction> function) {
std::vector<FrameSummary> frames;
frame->Summarize(&frames);
for (size_t i = frames.size(); i != 0; i--) {
if (*frames[i - 1].AsJavaScript().function() == *function) {
return static_cast<int>(i) - 1;
}
}
return -1;
}
namespace {
Handle<Object> GetFunctionArguments(Isolate* isolate,
Handle<JSFunction> function) {
// Find the top invocation of the function by traversing frames.
for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) {
JavaScriptFrame* frame = it.frame();
int function_index = FindFunctionInFrame(frame, function);
if (function_index < 0) continue;
if (function_index > 0) {
// The function in question was inlined. Inlined functions have the
// correct number of arguments and no allocated arguments object, so
// we can construct a fresh one by interpreting the function's
// deoptimization input data.
return ArgumentsForInlinedFunction(frame, function, function_index);
}
// Find the frame that holds the actual arguments passed to the function.
if (it.frame()->has_adapted_arguments()) {
it.AdvanceOneFrame();
DCHECK(it.frame()->is_arguments_adaptor());
}
frame = it.frame();
// Get the number of arguments and construct an arguments object
// mirror for the right frame.
const int length = frame->ComputeParametersCount();
Handle<JSObject> arguments = isolate->factory()->NewArgumentsObject(
function, length);
Handle<FixedArray> array = isolate->factory()->NewFixedArray(length);
// Copy the parameters to the arguments object.
DCHECK(array->length() == length);
for (int i = 0; i < length; i++) {
Object* value = frame->GetParameter(i);
if (value->IsTheHole(isolate)) {
// Generators currently use holes as dummy arguments when resuming. We
// must not leak those.
DCHECK(IsResumableFunction(function->shared()->kind()));
value = isolate->heap()->undefined_value();
}
array->set(i, value);
}
arguments->set_elements(*array);
// Return the freshly allocated arguments object.
return arguments;
}
// No frame corresponding to the given function found. Return null.
return isolate->factory()->null_value();
}
} // namespace
Handle<JSObject> Accessors::FunctionGetArguments(Handle<JSFunction> function) {
Handle<Object> arguments =
GetFunctionArguments(function->GetIsolate(), function);
CHECK(arguments->IsJSObject());
return Handle<JSObject>::cast(arguments);
}
void Accessors::FunctionArgumentsGetter(
v8::Local<v8::Name> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
HandleScope scope(isolate);
Handle<JSFunction> function =
Handle<JSFunction>::cast(Utils::OpenHandle(*info.Holder()));
Handle<Object> result =
function->shared()->native()
? Handle<Object>::cast(isolate->factory()->null_value())
: GetFunctionArguments(isolate, function);
info.GetReturnValue().Set(Utils::ToLocal(result));
}
Handle<AccessorInfo> Accessors::MakeFunctionArgumentsInfo(Isolate* isolate) {
return MakeAccessor(isolate, isolate->factory()->arguments_string(),
&FunctionArgumentsGetter, nullptr);
}
//
// Accessors::FunctionCaller
//
static inline bool AllowAccessToFunction(Context* current_context,
JSFunction* function) {
return current_context->HasSameSecurityTokenAs(function->context());
}
class FrameFunctionIterator {
public:
explicit FrameFunctionIterator(Isolate* isolate)
: isolate_(isolate), frame_iterator_(isolate), inlined_frame_index_(-1) {
GetFrames();
}
// Iterate through functions until the first occurrence of 'function'.
// Returns true if one is found, and false if the iterator ends before.
bool Find(Handle<JSFunction> function) {
do {
if (!next().ToHandle(&function_)) return false;
} while (!function_.is_identical_to(function));
return true;
}
// Iterate through functions until the next non-toplevel one is found.
// Returns true if one is found, and false if the iterator ends before.
bool FindNextNonTopLevel() {
do {
if (!next().ToHandle(&function_)) return false;
} while (function_->shared()->is_toplevel());
return true;
}
// Iterate through function until the first native or user-provided function
// is found. Functions not defined in user-provided scripts are not visible
// unless directly exposed, in which case the native flag is set on them.
// Returns true if one is found, and false if the iterator ends before.
bool FindFirstNativeOrUserJavaScript() {
while (!function_->shared()->native() &&
!function_->shared()->IsUserJavaScript()) {
if (!next().ToHandle(&function_)) return false;
}
return true;
}
// In case of inlined frames the function could have been materialized from
// deoptimization information. If that is the case we need to make sure that
// subsequent call will see the same function, since we are about to hand out
// the value to JavaScript. Make sure to store the materialized value and
// trigger a deoptimization of the underlying frame.
Handle<JSFunction> MaterializeFunction() {
if (inlined_frame_index_ == 0) return function_;
JavaScriptFrame* frame = frame_iterator_.frame();
TranslatedState translated_values(frame);
translated_values.Prepare(frame->fp());
TranslatedFrame* translated_frame =
translated_values.GetFrameFromJSFrameIndex(inlined_frame_index_);
TranslatedFrame::iterator iter = translated_frame->begin();
// First value is the function.
bool should_deoptimize = iter->IsMaterializedObject();
Handle<Object> value = iter->GetValue();
if (should_deoptimize) {
translated_values.StoreMaterializedValuesAndDeopt(frame);
}
return Handle<JSFunction>::cast(value);
}
private:
MaybeHandle<JSFunction> next() {
while (true) {
inlined_frame_index_--;
if (inlined_frame_index_ == -1) {
if (!frame_iterator_.done()) {
frame_iterator_.Advance();
frames_.clear();
GetFrames();
}
if (inlined_frame_index_ == -1) return MaybeHandle<JSFunction>();
inlined_frame_index_--;
}
Handle<JSFunction> next_function =
frames_[inlined_frame_index_].AsJavaScript().function();
// Skip functions from other origins.
if (!AllowAccessToFunction(isolate_->context(), *next_function)) continue;
return next_function;
}
}
void GetFrames() {
DCHECK_EQ(-1, inlined_frame_index_);
if (frame_iterator_.done()) return;
JavaScriptFrame* frame = frame_iterator_.frame();
frame->Summarize(&frames_);
inlined_frame_index_ = static_cast<int>(frames_.size());
DCHECK_LT(0, inlined_frame_index_);
}
Isolate* isolate_;
Handle<JSFunction> function_;
JavaScriptFrameIterator frame_iterator_;
std::vector<FrameSummary> frames_;
int inlined_frame_index_;
};
MaybeHandle<JSFunction> FindCaller(Isolate* isolate,
Handle<JSFunction> function) {
FrameFunctionIterator it(isolate);
if (function->shared()->native()) {
return MaybeHandle<JSFunction>();
}
// Find the function from the frames. Return null in case no frame
// corresponding to the given function was found.
if (!it.Find(function)) {
return MaybeHandle<JSFunction>();
}
// Find previously called non-toplevel function.
if (!it.FindNextNonTopLevel()) {
return MaybeHandle<JSFunction>();
}
// Find the first user-land JavaScript function (or the entry point into
// native JavaScript builtins in case such a builtin was the caller).
if (!it.FindFirstNativeOrUserJavaScript()) {