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// Copyright 2014 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/ic/call-optimization.h"
#include "src/objects/objects-inl.h"
namespace v8 {
namespace internal {
CallOptimization::CallOptimization(Isolate* isolate, Handle<Object> function) {
constant_function_ = Handle<JSFunction>::null();
is_simple_api_call_ = false;
expected_receiver_type_ = Handle<FunctionTemplateInfo>::null();
api_call_info_ = Handle<CallHandlerInfo>::null();
if (function->IsJSFunction()) {
Initialize(isolate, Handle<JSFunction>::cast(function));
} else if (function->IsFunctionTemplateInfo()) {
Initialize(isolate, Handle<FunctionTemplateInfo>::cast(function));
}
}
Context CallOptimization::GetAccessorContext(Map holder_map) const {
if (is_constant_call()) {
return constant_function_->context().native_context();
}
JSFunction constructor = JSFunction::cast(holder_map.GetConstructor());
return constructor.context().native_context();
}
bool CallOptimization::IsCrossContextLazyAccessorPair(Context native_context,
Map holder_map) const {
DCHECK(native_context.IsNativeContext());
if (is_constant_call()) return false;
return native_context != GetAccessorContext(holder_map);
}
Handle<JSObject> CallOptimization::LookupHolderOfExpectedType(
Handle<Map> object_map, HolderLookup* holder_lookup) const {
DCHECK(is_simple_api_call());
if (!object_map->IsJSObjectMap()) {
*holder_lookup = kHolderNotFound;
return Handle<JSObject>::null();
}
if (expected_receiver_type_.is_null() ||
expected_receiver_type_->IsTemplateFor(*object_map)) {
*holder_lookup = kHolderIsReceiver;
return Handle<JSObject>::null();
}
if (object_map->IsJSGlobalProxyMap() && !object_map->prototype().IsNull()) {
JSObject raw_prototype = JSObject::cast(object_map->prototype());
Handle<JSObject> prototype(raw_prototype, raw_prototype.GetIsolate());
object_map = handle(prototype->map(), prototype->GetIsolate());
if (expected_receiver_type_->IsTemplateFor(*object_map)) {
*holder_lookup = kHolderFound;
return prototype;
}
}
*holder_lookup = kHolderNotFound;
return Handle<JSObject>::null();
}
bool CallOptimization::IsCompatibleReceiver(Handle<Object> receiver,
Handle<JSObject> holder) const {
DCHECK(is_simple_api_call());
if (!receiver->IsHeapObject()) return false;
Handle<Map> map(HeapObject::cast(*receiver).map(), holder->GetIsolate());
return IsCompatibleReceiverMap(map, holder);
}
bool CallOptimization::IsCompatibleReceiverMap(Handle<Map> map,
Handle<JSObject> holder) const {
HolderLookup holder_lookup;
Handle<JSObject> api_holder = LookupHolderOfExpectedType(map, &holder_lookup);
switch (holder_lookup) {
case kHolderNotFound:
return false;
case kHolderIsReceiver:
return true;
case kHolderFound:
if (api_holder.is_identical_to(holder)) return true;
// Check if holder is in prototype chain of api_holder.
{
JSObject object = *api_holder;
while (true) {
Object prototype = object.map().prototype();
if (!prototype.IsJSObject()) return false;
if (prototype == *holder) return true;
object = JSObject::cast(prototype);
}
}
break;
}
UNREACHABLE();
}
void CallOptimization::Initialize(
Isolate* isolate, Handle<FunctionTemplateInfo> function_template_info) {
if (function_template_info->call_code().IsUndefined(isolate)) return;
api_call_info_ = handle(
CallHandlerInfo::cast(function_template_info->call_code()), isolate);
if (!function_template_info->signature().IsUndefined(isolate)) {
expected_receiver_type_ =
handle(FunctionTemplateInfo::cast(function_template_info->signature()),
isolate);
}
is_simple_api_call_ = true;
}
void CallOptimization::Initialize(Isolate* isolate,
Handle<JSFunction> function) {
if (function.is_null() || !function->is_compiled()) return;
constant_function_ = function;
AnalyzePossibleApiFunction(isolate, function);
}
void CallOptimization::AnalyzePossibleApiFunction(Isolate* isolate,
Handle<JSFunction> function) {
if (!function->shared().IsApiFunction()) return;
Handle<FunctionTemplateInfo> info(function->shared().get_api_func_data(),
isolate);
// Require a C++ callback.
if (info->call_code().IsUndefined(isolate)) return;
api_call_info_ = handle(CallHandlerInfo::cast(info->call_code()), isolate);
if (!info->signature().IsUndefined(isolate)) {
expected_receiver_type_ =
handle(FunctionTemplateInfo::cast(info->signature()), isolate);
}
is_simple_api_call_ = true;
}
} // namespace internal
} // namespace v8
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