1 // Copyright 2006-2008 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 #include "debug.h" 33 #include "macro-assembler.h" 34 35 namespace v8 { 36 namespace internal { 37 38 39 Address IC::address() { 40 // Get the address of the call. 41 Address result = pc() - Assembler::kCallTargetAddressOffset; 42 43 #ifdef ENABLE_DEBUGGER_SUPPORT 44 Debug* debug = Isolate::Current()->debug(); 45 // First check if any break points are active if not just return the address 46 // of the call. 47 if (!debug->has_break_points()) return result; 48 49 // At least one break point is active perform additional test to ensure that 50 // break point locations are updated correctly. 51 if (debug->IsDebugBreak(Assembler::target_address_at(result))) { 52 // If the call site is a call to debug break then return the address in 53 // the original code instead of the address in the running code. This will 54 // cause the original code to be updated and keeps the breakpoint active in 55 // the running code. 56 return OriginalCodeAddress(); 57 } else { 58 // No break point here just return the address of the call. 59 return result; 60 } 61 #else 62 return result; 63 #endif 64 } 65 66 67 Code* IC::GetTargetAtAddress(Address address) { 68 // Get the target address of the IC. 69 Address target = Assembler::target_address_at(address); 70 // Convert target address to the code object. Code::GetCodeFromTargetAddress 71 // is safe for use during GC where the map might be marked. 72 Code* result = Code::GetCodeFromTargetAddress(target); 73 ASSERT(result->is_inline_cache_stub()); 74 return result; 75 } 76 77 78 void IC::SetTargetAtAddress(Address address, Code* target) { 79 ASSERT(target->is_inline_cache_stub() || target->is_compare_ic_stub()); 80 #ifdef DEBUG 81 // STORE_IC and KEYED_STORE_IC use Code::extra_ic_state() to mark 82 // ICs as strict mode. The strict-ness of the IC must be preserved. 83 Code* old_target = GetTargetAtAddress(address); 84 if (old_target->kind() == Code::STORE_IC || 85 old_target->kind() == Code::KEYED_STORE_IC) { 86 ASSERT(old_target->extra_ic_state() == target->extra_ic_state()); 87 } 88 #endif 89 Assembler::set_target_address_at(address, target->instruction_start()); 90 } 91 92 93 InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object, 94 JSObject* holder) { 95 if (object->IsJSObject()) { 96 return GetCodeCacheForObject(JSObject::cast(object), holder); 97 } 98 // If the object is a value, we use the prototype map for the cache. 99 ASSERT(object->IsString() || object->IsNumber() || object->IsBoolean()); 100 return PROTOTYPE_MAP; 101 } 102 103 104 InlineCacheHolderFlag IC::GetCodeCacheForObject(JSObject* object, 105 JSObject* holder) { 106 // Fast-properties and global objects store stubs in their own maps. 107 // Slow properties objects use prototype's map (unless the property is its own 108 // when holder == object). It works because slow properties objects having 109 // the same prototype (or a prototype with the same map) and not having 110 // the property are interchangeable for such a stub. 111 if (holder != object && 112 !object->HasFastProperties() && 113 !object->IsJSGlobalProxy() && 114 !object->IsJSGlobalObject()) { 115 return PROTOTYPE_MAP; 116 } 117 return OWN_MAP; 118 } 119 120 121 JSObject* IC::GetCodeCacheHolder(Object* object, InlineCacheHolderFlag holder) { 122 Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype()); 123 ASSERT(map_owner->IsJSObject()); 124 return JSObject::cast(map_owner); 125 } 126 127 128 } } // namespace v8::internal 129 130 #endif // V8_IC_INL_H_ 131