1 /* 2 * Copyright (C) 2008 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef JITCode_h 27 #define JITCode_h 28 29 #if ENABLE(JIT) 30 31 #include "CallFrame.h" 32 #include "JSValue.h" 33 #include "MacroAssemblerCodeRef.h" 34 #include "Profiler.h" 35 36 namespace JSC { 37 38 class JSGlobalData; 39 class RegisterFile; 40 41 class JITCode { 42 typedef MacroAssemblerCodeRef CodeRef; 43 typedef MacroAssemblerCodePtr CodePtr; 44 public: JITCode()45 JITCode() 46 { 47 } 48 JITCode(const CodeRef ref)49 JITCode(const CodeRef ref) 50 : m_ref(ref) 51 { 52 } 53 54 bool operator !() const 55 { 56 return !m_ref.m_code.executableAddress(); 57 } 58 addressForCall()59 CodePtr addressForCall() 60 { 61 return m_ref.m_code; 62 } 63 64 // This function returns the offset in bytes of 'pointerIntoCode' into 65 // this block of code. The pointer provided must be a pointer into this 66 // block of code. It is ASSERTed that no codeblock >4gb in size. offsetOf(void * pointerIntoCode)67 unsigned offsetOf(void* pointerIntoCode) 68 { 69 intptr_t result = reinterpret_cast<intptr_t>(pointerIntoCode) - reinterpret_cast<intptr_t>(m_ref.m_code.executableAddress()); 70 ASSERT(static_cast<intptr_t>(static_cast<unsigned>(result)) == result); 71 return static_cast<unsigned>(result); 72 } 73 74 // Execute the code! execute(RegisterFile * registerFile,CallFrame * callFrame,JSGlobalData * globalData)75 inline JSValue execute(RegisterFile* registerFile, CallFrame* callFrame, JSGlobalData* globalData) 76 { 77 JSValue result = JSValue::decode(ctiTrampoline(m_ref.m_code.executableAddress(), registerFile, callFrame, 0, Profiler::enabledProfilerReference(), globalData)); 78 return globalData->exception ? jsNull() : result; 79 } 80 start()81 void* start() 82 { 83 return m_ref.m_code.dataLocation(); 84 } 85 size()86 size_t size() 87 { 88 ASSERT(m_ref.m_code.executableAddress()); 89 return m_ref.m_size; 90 } 91 getExecutablePool()92 ExecutablePool* getExecutablePool() 93 { 94 return m_ref.m_executablePool.get(); 95 } 96 97 // Host functions are a bit special; they have a m_code pointer but they 98 // do not individully ref the executable pool containing the trampoline. HostFunction(CodePtr code)99 static JITCode HostFunction(CodePtr code) 100 { 101 return JITCode(code.dataLocation(), 0, 0); 102 } 103 104 private: JITCode(void * code,PassRefPtr<ExecutablePool> executablePool,size_t size)105 JITCode(void* code, PassRefPtr<ExecutablePool> executablePool, size_t size) 106 : m_ref(code, executablePool, size) 107 { 108 } 109 110 CodeRef m_ref; 111 }; 112 113 }; 114 115 #endif 116 117 #endif 118