jit/SpecializedThunkJIT.h

   1 /*
   2  * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef SpecializedThunkJIT_h
  27 #define SpecializedThunkJIT_h
  28
  29 #if ENABLE(JIT)
  30
  31 #include "Executable.h"
  32 #include "JSInterfaceJIT.h"
  33 #include "LinkBuffer.h"
  34
  35 namespace JSC {
  36
  37     class SpecializedThunkJIT : public JSInterfaceJIT {
  38     public:
  39         static const int ThisArgument = -1;
  40         SpecializedThunkJIT(int expectedArgCount, JSGlobalData* globalData, ExecutablePool* pool)
  41             : m_expectedArgCount(expectedArgCount)
  42             , m_globalData(globalData)
  43             , m_pool(pool)
  44         {
  45             // Check that we have the expected number of arguments
  46             m_failures.append(branch32(NotEqual, Address(callFrameRegister, RegisterFile::ArgumentCount * (int)sizeof(Register)), TrustedImm32(expectedArgCount + 1)));
  47         }
  48
  49         void loadDoubleArgument(int argument, FPRegisterID dst, RegisterID scratch)
  50         {
  51             unsigned src = argumentToVirtualRegister(argument);
  52             m_failures.append(emitLoadDouble(src, dst, scratch));
  53         }
  54
  55         void loadCellArgument(int argument, RegisterID dst)
  56         {
  57             unsigned src = argumentToVirtualRegister(argument);
  58             m_failures.append(emitLoadJSCell(src, dst));
  59         }
  60
  61         void loadJSStringArgument(int argument, RegisterID dst)
  62         {
  63             loadCellArgument(argument, dst);
  64             m_failures.append(branchPtr(NotEqual, Address(dst, 0), TrustedImmPtr(m_globalData->jsStringVPtr)));
  65             m_failures.append(branchTest32(NonZero, Address(dst, OBJECT_OFFSETOF(JSString, m_fiberCount))));
  66         }
  67
  68         void loadInt32Argument(int argument, RegisterID dst, Jump& failTarget)
  69         {
  70             unsigned src = argumentToVirtualRegister(argument);
  71             failTarget = emitLoadInt32(src, dst);
  72         }
  73
  74         void loadInt32Argument(int argument, RegisterID dst)
  75         {
  76             Jump conversionFailed;
  77             loadInt32Argument(argument, dst, conversionFailed);
  78             m_failures.append(conversionFailed);
  79         }
  80
  81         void appendFailure(const Jump& failure)
  82         {
  83             m_failures.append(failure);
  84         }
  85
  86         void returnJSValue(RegisterID src)
  87         {
  88             if (src != regT0)
  89                 move(src, regT0);
  90             loadPtr(payloadFor(RegisterFile::CallerFrame, callFrameRegister), callFrameRegister);
  91             ret();
  92         }
  93
  94         void returnDouble(FPRegisterID src)
  95         {
  96 #if USE(JSVALUE64)
  97             moveDoubleToPtr(src, regT0);
  98             subPtr(tagTypeNumberRegister, regT0);
  99 #else
 100             storeDouble(src, Address(stackPointerRegister, -(int)sizeof(double)));
 101             loadPtr(Address(stackPointerRegister, OBJECT_OFFSETOF(JSValue, u.asBits.tag) - sizeof(double)), regT1);
 102             loadPtr(Address(stackPointerRegister, OBJECT_OFFSETOF(JSValue, u.asBits.payload) - sizeof(double)), regT0);
 103 #endif
 104             loadPtr(payloadFor(RegisterFile::CallerFrame, callFrameRegister), callFrameRegister);
 105             ret();
 106         }
 107
 108         void returnInt32(RegisterID src)
 109         {
 110             if (src != regT0)
 111                 move(src, regT0);
 112             tagReturnAsInt32();
 113             loadPtr(payloadFor(RegisterFile::CallerFrame, callFrameRegister), callFrameRegister);
 114             ret();
 115         }
 116
 117         void returnJSCell(RegisterID src)
 118         {
 119             if (src != regT0)
 120                 move(src, regT0);
 121             tagReturnAsJSCell();
 122             loadPtr(payloadFor(RegisterFile::CallerFrame, callFrameRegister), callFrameRegister);
 123             ret();
 124         }
 125
 126         MacroAssemblerCodePtr finalize(JSGlobalData& globalData, MacroAssemblerCodePtr fallback)
 127         {
 128             LinkBuffer patchBuffer(globalData, this, m_pool.get());
 129             patchBuffer.link(m_failures, CodeLocationLabel(fallback));
 130             return patchBuffer.finalizeCode().m_code;
 131         }
 132
 133     private:
 134         int argumentToVirtualRegister(unsigned argument)
 135         {
 136             return -static_cast<int>(RegisterFile::CallFrameHeaderSize + (m_expectedArgCount - argument));
 137         }
 138
 139         void tagReturnAsInt32()
 140         {
 141 #if USE(JSVALUE64)
 142             orPtr(tagTypeNumberRegister, regT0);
 143 #else
 144             move(TrustedImm32(JSValue::Int32Tag), regT1);
 145 #endif
 146         }
 147
 148         void tagReturnAsJSCell()
 149         {
 150 #if USE(JSVALUE32_64)
 151             move(TrustedImm32(JSValue::CellTag), regT1);
 152 #endif
 153         }
 154
 155         int m_expectedArgCount;
 156         JSGlobalData* m_globalData;
 157         RefPtr<ExecutablePool> m_pool;
 158         MacroAssembler::JumpList m_failures;
 159     };
 160
 161 }
 162
 163 #endif // ENABLE(JIT)
 164
 165 #endif // SpecializedThunkJIT_h