jit/JSInterfaceJIT.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 JSInterfaceJIT_h
  27 #define JSInterfaceJIT_h
  28
  29 #include "BytecodeConventions.h"
  30 #include "CCallHelpers.h"
  31 #include "FPRInfo.h"
  32 #include "GPRInfo.h"
  33 #include "JITCode.h"
  34 #include "JITOperations.h"
  35 #include "JITStubs.h"
  36 #include "JSCJSValue.h"
  37 #include "JSStack.h"
  38 #include "JSString.h"
  39 #include "MacroAssembler.h"
  40 #include <wtf/Vector.h>
  41
  42 #if ENABLE(JIT)
  43
  44 namespace JSC {
  45     class JSInterfaceJIT : public CCallHelpers, public GPRInfo, public FPRInfo {
  46     public:
  47         JSInterfaceJIT(VM* vm, CodeBlock* codeBlock = 0)
  48             : CCallHelpers(vm, codeBlock)
  49         {
  50         }
  51
  52 #if USE(JSVALUE32_64)
  53         // Can't just propogate JSValue::Int32Tag as visual studio doesn't like it
  54         static const unsigned Int32Tag = 0xffffffff;
  55         COMPILE_ASSERT(Int32Tag == JSValue::Int32Tag, Int32Tag_out_of_sync);
  56 #else
  57         static const unsigned Int32Tag = static_cast<unsigned>(TagTypeNumber >> 32);
  58 #endif
  59         inline Jump emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload);
  60         inline Jump emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst);
  61         inline Jump emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch);
  62
  63 #if USE(JSVALUE32_64)
  64         inline Jump emitJumpIfNotJSCell(unsigned virtualRegisterIndex);
  65         inline Address tagFor(int index, RegisterID base = callFrameRegister);
  66 #endif
  67
  68 #if USE(JSVALUE64)
  69         Jump emitJumpIfNotJSCell(RegisterID);
  70         Jump emitJumpIfImmediateNumber(RegisterID reg);
  71         Jump emitJumpIfNotImmediateNumber(RegisterID reg);
  72         void emitFastArithImmToInt(RegisterID reg);
  73         void emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest);
  74 #endif
  75
  76         Jump emitJumpIfNotType(RegisterID baseReg, JSType);
  77
  78         void emitGetFromCallFrameHeaderPtr(JSStack::CallFrameHeaderEntry, RegisterID to, RegisterID from = callFrameRegister);
  79         void emitPutToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry);
  80         void emitPutImmediateToCallFrameHeader(void* value, JSStack::CallFrameHeaderEntry);
  81         void emitPutCellToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry);
  82
  83         inline Address payloadFor(int index, RegisterID base = callFrameRegister);
  84         inline Address intPayloadFor(int index, RegisterID base = callFrameRegister);
  85         inline Address intTagFor(int index, RegisterID base = callFrameRegister);
  86         inline Address addressFor(int index, RegisterID base = callFrameRegister);
  87     };
  88
  89     struct ThunkHelpers {
  90         static unsigned jsStringLengthOffset() { return OBJECT_OFFSETOF(JSString, m_length); }
  91         static unsigned jsStringValueOffset() { return OBJECT_OFFSETOF(JSString, m_value); }
  92     };
  93
  94 #if USE(JSVALUE32_64)
  95     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload)
  96     {
  97         loadPtr(payloadFor(virtualRegisterIndex), payload);
  98         return emitJumpIfNotJSCell(virtualRegisterIndex);
  99     }
 100
 101     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotJSCell(unsigned virtualRegisterIndex)
 102     {
 103         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 104         return branch32(NotEqual, tagFor(virtualRegisterIndex), TrustedImm32(JSValue::CellTag));
 105     }
 106
 107     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
 108     {
 109         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 110         loadPtr(payloadFor(virtualRegisterIndex), dst);
 111         return branch32(NotEqual, tagFor(static_cast<int>(virtualRegisterIndex)), TrustedImm32(JSValue::Int32Tag));
 112     }
 113
 114     inline JSInterfaceJIT::Address JSInterfaceJIT::tagFor(int virtualRegisterIndex, RegisterID base)
 115     {
 116         ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
 117         return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.tag));
 118     }
 119
 120     inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(int virtualRegisterIndex, RegisterID base)
 121     {
 122         ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
 123         return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.payload));
 124     }
 125
 126     inline JSInterfaceJIT::Address JSInterfaceJIT::intPayloadFor(int virtualRegisterIndex, RegisterID base)
 127     {
 128         return payloadFor(virtualRegisterIndex, base);
 129     }
 130
 131     inline JSInterfaceJIT::Address JSInterfaceJIT::intTagFor(int virtualRegisterIndex, RegisterID base)
 132     {
 133         return tagFor(virtualRegisterIndex, base);
 134     }
 135
 136     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch)
 137     {
 138         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 139         loadPtr(tagFor(virtualRegisterIndex), scratch);
 140         Jump isDouble = branch32(Below, scratch, TrustedImm32(JSValue::LowestTag));
 141         Jump notInt = branch32(NotEqual, scratch, TrustedImm32(JSValue::Int32Tag));
 142         loadPtr(payloadFor(virtualRegisterIndex), scratch);
 143         convertInt32ToDouble(scratch, dst);
 144         Jump done = jump();
 145         isDouble.link(this);
 146         loadDouble(addressFor(virtualRegisterIndex), dst);
 147         done.link(this);
 148         return notInt;
 149     }
 150
 151 #endif
 152
 153 #if USE(JSVALUE64)
 154     ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotJSCell(RegisterID reg)
 155     {
 156         return branchTest64(NonZero, reg, tagMaskRegister);
 157     }
 158
 159     ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfImmediateNumber(RegisterID reg)
 160     {
 161         return branchTest64(NonZero, reg, tagTypeNumberRegister);
 162     }
 163     ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotImmediateNumber(RegisterID reg)
 164     {
 165         return branchTest64(Zero, reg, tagTypeNumberRegister);
 166     }
 167     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID dst)
 168     {
 169         load64(addressFor(virtualRegisterIndex), dst);
 170         return branchTest64(NonZero, dst, tagMaskRegister);
 171     }
 172
 173     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
 174     {
 175         load64(addressFor(virtualRegisterIndex), dst);
 176         Jump result = branch64(Below, dst, tagTypeNumberRegister);
 177         zeroExtend32ToPtr(dst, dst);
 178         return result;
 179     }
 180
 181     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch)
 182     {
 183         load64(addressFor(virtualRegisterIndex), scratch);
 184         Jump notNumber = emitJumpIfNotImmediateNumber(scratch);
 185         Jump notInt = branch64(Below, scratch, tagTypeNumberRegister);
 186         convertInt32ToDouble(scratch, dst);
 187         Jump done = jump();
 188         notInt.link(this);
 189         add64(tagTypeNumberRegister, scratch);
 190         move64ToDouble(scratch, dst);
 191         done.link(this);
 192         return notNumber;
 193     }
 194
 195     ALWAYS_INLINE void JSInterfaceJIT::emitFastArithImmToInt(RegisterID)
 196     {
 197     }
 198
 199     // operand is int32_t, must have been zero-extended if register is 64-bit.
 200     ALWAYS_INLINE void JSInterfaceJIT::emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest)
 201     {
 202         if (src != dest)
 203             move(src, dest);
 204         or64(tagTypeNumberRegister, dest);
 205     }
 206 #endif
 207
 208 #if USE(JSVALUE64)
 209     inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(int virtualRegisterIndex, RegisterID base)
 210     {
 211         ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
 212         return addressFor(virtualRegisterIndex, base);
 213     }
 214
 215     inline JSInterfaceJIT::Address JSInterfaceJIT::intPayloadFor(int virtualRegisterIndex, RegisterID base)
 216     {
 217         ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
 218         return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
 219     }
 220     inline JSInterfaceJIT::Address JSInterfaceJIT::intTagFor(int virtualRegisterIndex, RegisterID base)
 221     {
 222         ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
 223         return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
 224     }
 225 #endif
 226
 227     ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotType(RegisterID baseReg, JSType type)
 228     {
 229         return branch8(NotEqual, Address(baseReg, JSCell::typeInfoTypeOffset()), TrustedImm32(type));
 230     }
 231
 232     ALWAYS_INLINE void JSInterfaceJIT::emitGetFromCallFrameHeaderPtr(JSStack::CallFrameHeaderEntry entry, RegisterID to, RegisterID from)
 233     {
 234         loadPtr(Address(from, entry * sizeof(Register)), to);
 235     }
 236
 237     ALWAYS_INLINE void JSInterfaceJIT::emitPutToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry entry)
 238     {
 239 #if USE(JSVALUE32_64)
 240         storePtr(from, payloadFor(entry, callFrameRegister));
 241 #else
 242         store64(from, addressFor(entry, callFrameRegister));
 243 #endif
 244     }
 245
 246     ALWAYS_INLINE void JSInterfaceJIT::emitPutImmediateToCallFrameHeader(void* value, JSStack::CallFrameHeaderEntry entry)
 247     {
 248         storePtr(TrustedImmPtr(value), Address(callFrameRegister, entry * sizeof(Register)));
 249     }
 250
 251     ALWAYS_INLINE void JSInterfaceJIT::emitPutCellToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry entry)
 252     {
 253 #if USE(JSVALUE32_64)
 254         store32(TrustedImm32(JSValue::CellTag), tagFor(entry, callFrameRegister));
 255         store32(from, payloadFor(entry, callFrameRegister));
 256 #else
 257         store64(from, addressFor(entry, callFrameRegister));
 258 #endif
 259     }
 260
 261     inline JSInterfaceJIT::Address JSInterfaceJIT::addressFor(int virtualRegisterIndex, RegisterID base)
 262     {
 263         ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
 264         return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)));
 265     }
 266
 267 } // namespace JSC
 268
 269 #endif // ENABLE(JIT)
 270
 271 #endif // JSInterfaceJIT_h