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 #include <wtf/Platform.h> 30 31 #if ENABLE(JIT) 32 33 #include "CallFrame.h" 34 #include "JSValue.h" 35 #include "MacroAssemblerCodeRef.h" 36 #include "Profiler.h" 37 38 namespace JSC { 39 40 class JSGlobalData; 41 class RegisterFile; 42 43 class JITCode { 44 typedef MacroAssemblerCodeRef CodeRef; 45 typedef MacroAssemblerCodePtr CodePtr; 46 public: JITCode()47 JITCode() 48 { 49 } 50 JITCode(const CodeRef ref)51 JITCode(const CodeRef ref) 52 : m_ref(ref) 53 { 54 } 55 56 bool operator !() const 57 { 58 return !m_ref.m_code.executableAddress(); 59 } 60 addressForCall()61 CodePtr addressForCall() 62 { 63 return m_ref.m_code; 64 } 65 66 // This function returns the offset in bytes of 'pointerIntoCode' into 67 // this block of code. The pointer provided must be a pointer into this 68 // block of code. It is ASSERTed that no codeblock >4gb in size. offsetOf(void * pointerIntoCode)69 unsigned offsetOf(void* pointerIntoCode) 70 { 71 intptr_t result = reinterpret_cast<intptr_t>(pointerIntoCode) - reinterpret_cast<intptr_t>(m_ref.m_code.executableAddress()); 72 ASSERT(static_cast<intptr_t>(static_cast<unsigned>(result)) == result); 73 return static_cast<unsigned>(result); 74 } 75 76 // Execute the code! execute(RegisterFile * registerFile,CallFrame * callFrame,JSGlobalData * globalData,JSValue * exception)77 inline JSValue execute(RegisterFile* registerFile, CallFrame* callFrame, JSGlobalData* globalData, JSValue* exception) 78 { 79 return JSValue::decode(ctiTrampoline(m_ref.m_code.executableAddress(), registerFile, callFrame, exception, Profiler::enabledProfilerReference(), globalData)); 80 } 81 start()82 void* start() 83 { 84 return m_ref.m_code.dataLocation(); 85 } 86 size()87 size_t size() 88 { 89 ASSERT(m_ref.m_code.executableAddress()); 90 return m_ref.m_size; 91 } 92 getExecutablePool()93 ExecutablePool* getExecutablePool() 94 { 95 return m_ref.m_executablePool.get(); 96 } 97 98 // Host functions are a bit special; they have a m_code pointer but they 99 // do not individully ref the executable pool containing the trampoline. HostFunction(CodePtr code)100 static JITCode HostFunction(CodePtr code) 101 { 102 return JITCode(code.dataLocation(), 0, 0); 103 } 104 105 private: JITCode(void * code,PassRefPtr<ExecutablePool> executablePool,size_t size)106 JITCode(void* code, PassRefPtr<ExecutablePool> executablePool, size_t size) 107 : m_ref(code, executablePool, size) 108 { 109 } 110 111 CodeRef m_ref; 112 }; 113 114 }; 115 116 #endif 117 118 #endif 119