1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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35 #include "macro-assembler.h"
41 Address IC::address() const {
42 // Get the address of the call.
43 Address result = Assembler::target_address_from_return_address(pc());
45 #ifdef ENABLE_DEBUGGER_SUPPORT
46 Debug* debug = isolate()->debug();
47 // First check if any break points are active if not just return the address
49 if (!debug->has_break_points()) return result;
51 // At least one break point is active perform additional test to ensure that
52 // break point locations are updated correctly.
53 if (debug->IsDebugBreak(Assembler::target_address_at(result))) {
54 // If the call site is a call to debug break then return the address in
55 // the original code instead of the address in the running code. This will
56 // cause the original code to be updated and keeps the breakpoint active in
58 return OriginalCodeAddress();
60 // No break point here just return the address of the call.
69 Code* IC::GetTargetAtAddress(Address address) {
70 // Get the target address of the IC.
71 Address target = Assembler::target_address_at(address);
72 // Convert target address to the code object. Code::GetCodeFromTargetAddress
73 // is safe for use during GC where the map might be marked.
74 Code* result = Code::GetCodeFromTargetAddress(target);
75 ASSERT(result->is_inline_cache_stub());
80 void IC::SetTargetAtAddress(Address address, Code* target) {
81 ASSERT(target->is_inline_cache_stub() || target->is_compare_ic_stub());
82 Heap* heap = target->GetHeap();
83 Code* old_target = GetTargetAtAddress(address);
85 // STORE_IC and KEYED_STORE_IC use Code::extra_ic_state() to mark
86 // ICs as strict mode. The strict-ness of the IC must be preserved.
87 if (old_target->kind() == Code::STORE_IC ||
88 old_target->kind() == Code::KEYED_STORE_IC) {
89 ASSERT(StoreIC::GetStrictMode(old_target->extra_ic_state()) ==
90 StoreIC::GetStrictMode(target->extra_ic_state()));
93 Assembler::set_target_address_at(address, target->instruction_start());
94 if (heap->gc_state() == Heap::MARK_COMPACT) {
95 heap->mark_compact_collector()->RecordCodeTargetPatch(address, target);
97 heap->incremental_marking()->RecordCodeTargetPatch(address, target);
99 PostPatching(address, target, old_target);
103 InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object) {
104 if (object->IsJSObject()) return OWN_MAP;
106 // If the object is a value, we use the prototype map for the cache.
107 ASSERT(object->IsString() || object->IsSymbol() ||
108 object->IsNumber() || object->IsFloat32x4() ||
109 object->IsInt32x4() || object->IsBoolean());
110 return PROTOTYPE_MAP;
114 HeapObject* IC::GetCodeCacheHolder(Isolate* isolate,
116 InlineCacheHolderFlag holder) {
117 if (object->IsSmi()) holder = PROTOTYPE_MAP;
118 Object* map_owner = holder == OWN_MAP
119 ? object : object->GetPrototype(isolate);
120 return HeapObject::cast(map_owner);
124 InlineCacheHolderFlag IC::GetCodeCacheFlag(HeapType* type) {
125 if (type->Is(HeapType::Boolean()) ||
126 type->Is(HeapType::Number()) ||
127 type->Is(HeapType::Float32x4()) ||
128 type->Is(HeapType::Int32x4()) ||
129 type->Is(HeapType::String()) ||
130 type->Is(HeapType::Symbol())) {
131 return PROTOTYPE_MAP;
137 Handle<Map> IC::GetCodeCacheHolder(InlineCacheHolderFlag flag,
140 if (flag == PROTOTYPE_MAP) {
141 Context* context = isolate->context()->native_context();
142 JSFunction* constructor;
143 if (type->Is(HeapType::Boolean())) {
144 constructor = context->boolean_function();
145 } else if (type->Is(HeapType::Number())) {
146 constructor = context->number_function();
147 } else if (type->Is(HeapType::Float32x4())) {
148 constructor = context->float32x4_function();
149 } else if (type->Is(HeapType::Int32x4())) {
150 constructor = context->int32x4_function();
151 } else if (type->Is(HeapType::String())) {
152 constructor = context->string_function();
154 ASSERT(type->Is(HeapType::Symbol()));
155 constructor = context->symbol_function();
157 return handle(JSObject::cast(constructor->instance_prototype())->map());
159 return TypeToMap(type, isolate);
163 } } // namespace v8::internal
165 #endif // V8_IC_INL_H_