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 4// met: 5// 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. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28#ifndef V8_IC_INL_H_ 29#define V8_IC_INL_H_ 30 31#include "ic.h" 32 33#include "compiler.h" 34#include "debug.h" 35#include "macro-assembler.h" 36 37namespace v8 { 38namespace internal { 39 40 41Address IC::address() const { 42 // Get the address of the call. 43 Address result = Assembler::target_address_from_return_address(pc()); 44 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 48 // of the call. 49 if (!debug->has_break_points()) return result; 50 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 57 // the running code. 58 return OriginalCodeAddress(); 59 } else { 60 // No break point here just return the address of the call. 61 return result; 62 } 63#else 64 return result; 65#endif 66} 67 68 69Code* 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()); 76 return result; 77} 78 79 80void 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); 84#ifdef DEBUG 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())); 91 } 92#endif 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); 96 } else { 97 heap->incremental_marking()->RecordCodeTargetPatch(address, target); 98 } 99 PostPatching(address, target, old_target); 100} 101 102 103InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object) { 104 if (object->IsJSObject()) return OWN_MAP; 105 106 // If the object is a value, we use the prototype map for the cache. 107 ASSERT(object->IsString() || object->IsSymbol() || 108 object->IsNumber() || object->IsBoolean()); 109 return PROTOTYPE_MAP; 110} 111 112 113HeapObject* IC::GetCodeCacheHolder(Isolate* isolate, 114 Object* object, 115 InlineCacheHolderFlag holder) { 116 if (object->IsSmi()) holder = PROTOTYPE_MAP; 117 Object* map_owner = holder == OWN_MAP 118 ? object : object->GetPrototype(isolate); 119 return HeapObject::cast(map_owner); 120} 121 122 123InlineCacheHolderFlag IC::GetCodeCacheFlag(Type* type) { 124 if (type->Is(Type::Boolean()) || 125 type->Is(Type::Number()) || 126 type->Is(Type::String()) || 127 type->Is(Type::Symbol())) { 128 return PROTOTYPE_MAP; 129 } 130 return OWN_MAP; 131} 132 133 134Handle<Map> IC::GetCodeCacheHolder(InlineCacheHolderFlag flag, 135 Type* type, 136 Isolate* isolate) { 137 if (flag == PROTOTYPE_MAP) { 138 Context* context = isolate->context()->native_context(); 139 JSFunction* constructor; 140 if (type->Is(Type::Boolean())) { 141 constructor = context->boolean_function(); 142 } else if (type->Is(Type::Number())) { 143 constructor = context->number_function(); 144 } else if (type->Is(Type::String())) { 145 constructor = context->string_function(); 146 } else { 147 ASSERT(type->Is(Type::Symbol())); 148 constructor = context->symbol_function(); 149 } 150 return handle(JSObject::cast(constructor->instance_prototype())->map()); 151 } 152 return TypeToMap(type, isolate); 153} 154 155 156} } // namespace v8::internal 157 158#endif // V8_IC_INL_H_ 159