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 = pc() - Assembler::kCallTargetAddressOffset; 44 45#ifdef ENABLE_DEBUGGER_SUPPORT 46 Debug* debug = Isolate::Current()->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 Code* old_target = GetTargetAtAddress(address); 83#ifdef DEBUG 84 // STORE_IC and KEYED_STORE_IC use Code::extra_ic_state() to mark 85 // ICs as strict mode. The strict-ness of the IC must be preserved. 86 if (old_target->kind() == Code::STORE_IC || 87 old_target->kind() == Code::KEYED_STORE_IC) { 88 ASSERT(Code::GetStrictMode(old_target->extra_ic_state()) == 89 Code::GetStrictMode(target->extra_ic_state())); 90 } 91#endif 92 Assembler::set_target_address_at(address, target->instruction_start()); 93 target->GetHeap()->incremental_marking()->RecordCodeTargetPatch(address, 94 target); 95 PostPatching(address, target, old_target); 96} 97 98 99InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object, 100 JSObject* holder) { 101 if (object->IsJSObject()) { 102 return GetCodeCacheForObject(JSObject::cast(object), holder); 103 } 104 // If the object is a value, we use the prototype map for the cache. 105 ASSERT(object->IsString() || object->IsNumber() || object->IsBoolean()); 106 return PROTOTYPE_MAP; 107} 108 109 110InlineCacheHolderFlag IC::GetCodeCacheForObject(JSObject* object, 111 JSObject* holder) { 112 // Fast-properties and global objects store stubs in their own maps. 113 // Slow properties objects use prototype's map (unless the property is its own 114 // when holder == object). It works because slow properties objects having 115 // the same prototype (or a prototype with the same map) and not having 116 // the property are interchangeable for such a stub. 117 if (holder != object && 118 !object->HasFastProperties() && 119 !object->IsJSGlobalProxy() && 120 !object->IsJSGlobalObject()) { 121 return PROTOTYPE_MAP; 122 } 123 return OWN_MAP; 124} 125 126 127JSObject* IC::GetCodeCacheHolder(Object* object, InlineCacheHolderFlag holder) { 128 Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype()); 129 ASSERT(map_owner->IsJSObject()); 130 return JSObject::cast(map_owner); 131} 132 133 134} } // namespace v8::internal 135 136#endif // V8_IC_INL_H_ 137