Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/v8.h" |
| 6 | |
| 7 | #include "src/ic/call-optimization.h" |
| 8 | |
| 9 | |
| 10 | namespace v8 { |
| 11 | namespace internal { |
| 12 | |
| 13 | CallOptimization::CallOptimization(Handle<JSFunction> function) { |
| 14 | Initialize(function); |
| 15 | } |
| 16 | |
| 17 | |
| 18 | Handle<JSObject> CallOptimization::LookupHolderOfExpectedType( |
| 19 | Handle<Map> object_map, HolderLookup* holder_lookup) const { |
| 20 | DCHECK(is_simple_api_call()); |
| 21 | if (!object_map->IsJSObjectMap()) { |
| 22 | *holder_lookup = kHolderNotFound; |
| 23 | return Handle<JSObject>::null(); |
| 24 | } |
| 25 | if (expected_receiver_type_.is_null() || |
| 26 | expected_receiver_type_->IsTemplateFor(*object_map)) { |
| 27 | *holder_lookup = kHolderIsReceiver; |
| 28 | return Handle<JSObject>::null(); |
| 29 | } |
| 30 | while (true) { |
| 31 | if (!object_map->prototype()->IsJSObject()) break; |
| 32 | Handle<JSObject> prototype(JSObject::cast(object_map->prototype())); |
| 33 | if (!prototype->map()->is_hidden_prototype()) break; |
| 34 | object_map = handle(prototype->map()); |
| 35 | if (expected_receiver_type_->IsTemplateFor(*object_map)) { |
| 36 | *holder_lookup = kHolderFound; |
| 37 | return prototype; |
| 38 | } |
| 39 | } |
| 40 | *holder_lookup = kHolderNotFound; |
| 41 | return Handle<JSObject>::null(); |
| 42 | } |
| 43 | |
| 44 | |
| 45 | bool CallOptimization::IsCompatibleReceiver(Handle<Object> receiver, |
| 46 | Handle<JSObject> holder) const { |
| 47 | DCHECK(is_simple_api_call()); |
| 48 | if (!receiver->IsJSObject()) return false; |
| 49 | Handle<Map> map(JSObject::cast(*receiver)->map()); |
| 50 | HolderLookup holder_lookup; |
| 51 | Handle<JSObject> api_holder = LookupHolderOfExpectedType(map, &holder_lookup); |
| 52 | switch (holder_lookup) { |
| 53 | case kHolderNotFound: |
| 54 | return false; |
| 55 | case kHolderIsReceiver: |
| 56 | return true; |
| 57 | case kHolderFound: |
| 58 | if (api_holder.is_identical_to(holder)) return true; |
| 59 | // Check if holder is in prototype chain of api_holder. |
| 60 | { |
| 61 | JSObject* object = *api_holder; |
| 62 | while (true) { |
| 63 | Object* prototype = object->map()->prototype(); |
| 64 | if (!prototype->IsJSObject()) return false; |
| 65 | if (prototype == *holder) return true; |
| 66 | object = JSObject::cast(prototype); |
| 67 | } |
| 68 | } |
| 69 | break; |
| 70 | } |
| 71 | UNREACHABLE(); |
| 72 | return false; |
| 73 | } |
| 74 | |
| 75 | |
| 76 | void CallOptimization::Initialize(Handle<JSFunction> function) { |
| 77 | constant_function_ = Handle<JSFunction>::null(); |
| 78 | is_simple_api_call_ = false; |
| 79 | expected_receiver_type_ = Handle<FunctionTemplateInfo>::null(); |
| 80 | api_call_info_ = Handle<CallHandlerInfo>::null(); |
| 81 | |
| 82 | if (function.is_null() || !function->is_compiled()) return; |
| 83 | |
| 84 | constant_function_ = function; |
| 85 | AnalyzePossibleApiFunction(function); |
| 86 | } |
| 87 | |
| 88 | |
| 89 | void CallOptimization::AnalyzePossibleApiFunction(Handle<JSFunction> function) { |
| 90 | if (!function->shared()->IsApiFunction()) return; |
| 91 | Handle<FunctionTemplateInfo> info(function->shared()->get_api_func_data()); |
| 92 | |
| 93 | // Require a C++ callback. |
| 94 | if (info->call_code()->IsUndefined()) return; |
| 95 | api_call_info_ = |
| 96 | Handle<CallHandlerInfo>(CallHandlerInfo::cast(info->call_code())); |
| 97 | |
| 98 | // Accept signatures that either have no restrictions at all or |
| 99 | // only have restrictions on the receiver. |
| 100 | if (!info->signature()->IsUndefined()) { |
| 101 | Handle<SignatureInfo> signature = |
| 102 | Handle<SignatureInfo>(SignatureInfo::cast(info->signature())); |
| 103 | if (!signature->args()->IsUndefined()) return; |
| 104 | if (!signature->receiver()->IsUndefined()) { |
| 105 | expected_receiver_type_ = Handle<FunctionTemplateInfo>( |
| 106 | FunctionTemplateInfo::cast(signature->receiver())); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | is_simple_api_call_ = true; |
| 111 | } |
| 112 | } |
| 113 | } // namespace v8::internal |