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 "JITCode.h"
  30 #include "JITStubs.h"
  31 #include "JSImmediate.h"
  32 #include "MacroAssembler.h"
  33 #include "RegisterFile.h"
  34 #include <wtf/AlwaysInline.h>
  35 #include <wtf/Vector.h>
  36
  37 namespace JSC {
  38     class JSInterfaceJIT : public MacroAssembler {
  39     public:
  40         // NOTES:
  41         //
  42         // regT0 has two special meanings.  The return value from a stub
  43         // call will always be in regT0, and by default (unless
  44         // a register is specified) emitPutVirtualRegister() will store
  45         // the value from regT0.
  46         //
  47         // regT3 is required to be callee-preserved.
  48         //
  49         // tempRegister2 is has no such dependencies.  It is important that
  50         // on x86/x86-64 it is ecx for performance reasons, since the
  51         // MacroAssembler will need to plant register swaps if it is not -
  52         // however the code will still function correctly.
  53 #if CPU(X86_64)
  54         static const RegisterID returnValueRegister = X86Registers::eax;
  55         static const RegisterID cachedResultRegister = X86Registers::eax;
  56         static const RegisterID firstArgumentRegister = X86Registers::edi;
  57
  58         static const RegisterID timeoutCheckRegister = X86Registers::r12;
  59         static const RegisterID callFrameRegister = X86Registers::r13;
  60         static const RegisterID tagTypeNumberRegister = X86Registers::r14;
  61         static const RegisterID tagMaskRegister = X86Registers::r15;
  62
  63         static const RegisterID regT0 = X86Registers::eax;
  64         static const RegisterID regT1 = X86Registers::edx;
  65         static const RegisterID regT2 = X86Registers::ecx;
  66         static const RegisterID regT3 = X86Registers::ebx;
  67
  68         static const FPRegisterID fpRegT0 = X86Registers::xmm0;
  69         static const FPRegisterID fpRegT1 = X86Registers::xmm1;
  70         static const FPRegisterID fpRegT2 = X86Registers::xmm2;
  71         static const FPRegisterID fpRegT3 = X86Registers::xmm3;
  72 #elif CPU(X86)
  73         static const RegisterID returnValueRegister = X86Registers::eax;
  74         static const RegisterID cachedResultRegister = X86Registers::eax;
  75         // On x86 we always use fastcall conventions = but on
  76         // OS X if might make more sense to just use regparm.
  77         static const RegisterID firstArgumentRegister = X86Registers::ecx;
  78
  79         static const RegisterID timeoutCheckRegister = X86Registers::esi;
  80         static const RegisterID callFrameRegister = X86Registers::edi;
  81
  82         static const RegisterID regT0 = X86Registers::eax;
  83         static const RegisterID regT1 = X86Registers::edx;
  84         static const RegisterID regT2 = X86Registers::ecx;
  85         static const RegisterID regT3 = X86Registers::ebx;
  86
  87         static const FPRegisterID fpRegT0 = X86Registers::xmm0;
  88         static const FPRegisterID fpRegT1 = X86Registers::xmm1;
  89         static const FPRegisterID fpRegT2 = X86Registers::xmm2;
  90         static const FPRegisterID fpRegT3 = X86Registers::xmm3;
  91 #elif CPU(ARM_THUMB2)
  92         static const RegisterID returnValueRegister = ARMRegisters::r0;
  93         static const RegisterID cachedResultRegister = ARMRegisters::r0;
  94         static const RegisterID firstArgumentRegister = ARMRegisters::r0;
  95
  96         static const RegisterID regT0 = ARMRegisters::r0;
  97         static const RegisterID regT1 = ARMRegisters::r1;
  98         static const RegisterID regT2 = ARMRegisters::r2;
  99         static const RegisterID regT3 = ARMRegisters::r4;
 100
 101         static const RegisterID callFrameRegister = ARMRegisters::r5;
 102         static const RegisterID timeoutCheckRegister = ARMRegisters::r6;
 103
 104         static const FPRegisterID fpRegT0 = ARMRegisters::d0;
 105         static const FPRegisterID fpRegT1 = ARMRegisters::d1;
 106         static const FPRegisterID fpRegT2 = ARMRegisters::d2;
 107         static const FPRegisterID fpRegT3 = ARMRegisters::d3;
 108 #elif CPU(ARM_TRADITIONAL)
 109         static const RegisterID returnValueRegister = ARMRegisters::r0;
 110         static const RegisterID cachedResultRegister = ARMRegisters::r0;
 111         static const RegisterID firstArgumentRegister = ARMRegisters::r0;
 112
 113         static const RegisterID timeoutCheckRegister = ARMRegisters::r5;
 114         static const RegisterID callFrameRegister = ARMRegisters::r4;
 115
 116         static const RegisterID regT0 = ARMRegisters::r0;
 117         static const RegisterID regT1 = ARMRegisters::r1;
 118         static const RegisterID regT2 = ARMRegisters::r2;
 119         // Callee preserved
 120         static const RegisterID regT3 = ARMRegisters::r7;
 121
 122         static const RegisterID regS0 = ARMRegisters::S0;
 123         // Callee preserved
 124         static const RegisterID regS1 = ARMRegisters::S1;
 125
 126         static const RegisterID regStackPtr = ARMRegisters::sp;
 127         static const RegisterID regLink = ARMRegisters::lr;
 128
 129         static const FPRegisterID fpRegT0 = ARMRegisters::d0;
 130         static const FPRegisterID fpRegT1 = ARMRegisters::d1;
 131         static const FPRegisterID fpRegT2 = ARMRegisters::d2;
 132         static const FPRegisterID fpRegT3 = ARMRegisters::d3;
 133 #elif CPU(MIPS)
 134         static const RegisterID returnValueRegister = MIPSRegisters::v0;
 135         static const RegisterID cachedResultRegister = MIPSRegisters::v0;
 136         static const RegisterID firstArgumentRegister = MIPSRegisters::a0;
 137
 138         // regT0 must be v0 for returning a 32-bit value.
 139         static const RegisterID regT0 = MIPSRegisters::v0;
 140
 141         // regT1 must be v1 for returning a pair of 32-bit value.
 142         static const RegisterID regT1 = MIPSRegisters::v1;
 143
 144         static const RegisterID regT2 = MIPSRegisters::t4;
 145
 146         // regT3 must be saved in the callee, so use an S register.
 147         static const RegisterID regT3 = MIPSRegisters::s2;
 148
 149         static const RegisterID callFrameRegister = MIPSRegisters::s0;
 150         static const RegisterID timeoutCheckRegister = MIPSRegisters::s1;
 151
 152         static const FPRegisterID fpRegT0 = MIPSRegisters::f4;
 153         static const FPRegisterID fpRegT1 = MIPSRegisters::f6;
 154         static const FPRegisterID fpRegT2 = MIPSRegisters::f8;
 155         static const FPRegisterID fpRegT2 = MIPSRegisters::f10;
 156 #else
 157 #error "JIT not supported on this platform."
 158 #endif
 159
 160         inline Jump emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload);
 161         inline Jump emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst);
 162         inline Jump emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch);
 163
 164 #if USE(JSVALUE32_64)
 165         inline Jump emitJumpIfNotJSCell(unsigned virtualRegisterIndex);
 166         inline Address tagFor(unsigned index, RegisterID base = callFrameRegister);
 167 #endif
 168
 169 #if USE(JSVALUE32) || USE(JSVALUE64)
 170         Jump emitJumpIfImmediateNumber(RegisterID reg);
 171         Jump emitJumpIfNotImmediateNumber(RegisterID reg);
 172         void emitFastArithImmToInt(RegisterID reg);
 173 #endif
 174
 175         inline Address payloadFor(unsigned index, RegisterID base = callFrameRegister);
 176         inline Address addressFor(unsigned index, RegisterID base = callFrameRegister);
 177     };
 178
 179     struct ThunkHelpers {
 180         static unsigned stringImplDataOffset() { return WebCore::StringImpl::dataOffset(); }
 181         static unsigned jsStringLengthOffset() { return OBJECT_OFFSETOF(JSString, m_length); }
 182         static unsigned jsStringValueOffset() { return OBJECT_OFFSETOF(JSString, m_value); }
 183     };
 184
 185 #if USE(JSVALUE32_64)
 186     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload)
 187     {
 188         loadPtr(payloadFor(virtualRegisterIndex), payload);
 189         return emitJumpIfNotJSCell(virtualRegisterIndex);
 190     }
 191
 192     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotJSCell(unsigned virtualRegisterIndex)
 193     {
 194         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 195         return branch32(NotEqual, tagFor(virtualRegisterIndex), Imm32(JSValue::CellTag));
 196     }
 197
 198     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
 199     {
 200         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 201         loadPtr(payloadFor(virtualRegisterIndex), dst);
 202         return branch32(NotEqual, tagFor(virtualRegisterIndex), Imm32(JSValue::Int32Tag));
 203     }
 204
 205     inline JSInterfaceJIT::Address JSInterfaceJIT::tagFor(unsigned virtualRegisterIndex, RegisterID base)
 206     {
 207         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 208         return Address(base, (virtualRegisterIndex * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.tag));
 209     }
 210
 211     inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(unsigned virtualRegisterIndex, RegisterID base)
 212     {
 213         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 214         return Address(base, (virtualRegisterIndex * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.payload));
 215     }
 216
 217     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch)
 218     {
 219         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 220         loadPtr(tagFor(virtualRegisterIndex), scratch);
 221         Jump isDouble = branch32(Below, scratch, Imm32(JSValue::LowestTag));
 222         Jump notInt = branch32(NotEqual, scratch, Imm32(JSValue::Int32Tag));
 223         loadPtr(payloadFor(virtualRegisterIndex), scratch);
 224         convertInt32ToDouble(scratch, dst);
 225         Jump done = jump();
 226         isDouble.link(this);
 227         loadDouble(addressFor(virtualRegisterIndex), dst);
 228         done.link(this);
 229         return notInt;
 230     }
 231 #endif
 232
 233 #if USE(JSVALUE64)
 234     ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfImmediateNumber(RegisterID reg)
 235     {
 236         return branchTestPtr(NonZero, reg, tagTypeNumberRegister);
 237     }
 238     ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotImmediateNumber(RegisterID reg)
 239     {
 240         return branchTestPtr(Zero, reg, tagTypeNumberRegister);
 241     }
 242     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID dst)
 243     {
 244         loadPtr(addressFor(virtualRegisterIndex), dst);
 245         return branchTestPtr(NonZero, dst, tagMaskRegister);
 246     }
 247
 248     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
 249     {
 250         loadPtr(addressFor(virtualRegisterIndex), dst);
 251         Jump result = branchPtr(Below, dst, tagTypeNumberRegister);
 252         zeroExtend32ToPtr(dst, dst);
 253         return result;
 254     }
 255
 256     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch)
 257     {
 258         loadPtr(addressFor(virtualRegisterIndex), scratch);
 259         Jump notNumber = emitJumpIfNotImmediateNumber(scratch);
 260         Jump notInt = branchPtr(Below, scratch, tagTypeNumberRegister);
 261         convertInt32ToDouble(scratch, dst);
 262         Jump done = jump();
 263         notInt.link(this);
 264         addPtr(tagTypeNumberRegister, scratch);
 265         movePtrToDouble(scratch, dst);
 266         done.link(this);
 267         return notNumber;
 268     }
 269
 270     ALWAYS_INLINE void JSInterfaceJIT::emitFastArithImmToInt(RegisterID)
 271     {
 272     }
 273
 274 #endif
 275
 276 #if USE(JSVALUE32)
 277     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID dst)
 278     {
 279         loadPtr(addressFor(virtualRegisterIndex), dst);
 280         return branchTest32(NonZero, dst, Imm32(JSImmediate::TagMask));
 281     }
 282
 283     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
 284     {
 285         loadPtr(addressFor(virtualRegisterIndex), dst);
 286         Jump result = branchTest32(Zero, dst, Imm32(JSImmediate::TagTypeNumber));
 287         rshift32(Imm32(JSImmediate::IntegerPayloadShift), dst);
 288         return result;
 289     }
 290
 291     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned, FPRegisterID, RegisterID)
 292     {
 293         ASSERT_NOT_REACHED();
 294         return jump();
 295     }
 296
 297     ALWAYS_INLINE void JSInterfaceJIT::emitFastArithImmToInt(RegisterID reg)
 298     {
 299         rshift32(Imm32(JSImmediate::IntegerPayloadShift), reg);
 300     }
 301
 302 #endif
 303
 304 #if !USE(JSVALUE32_64)
 305     inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(unsigned virtualRegisterIndex, RegisterID base)
 306     {
 307         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 308         return addressFor(virtualRegisterIndex, base);
 309     }
 310 #endif
 311
 312     inline JSInterfaceJIT::Address JSInterfaceJIT::addressFor(unsigned virtualRegisterIndex, RegisterID base)
 313     {
 314         ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
 315         return Address(base, (virtualRegisterIndex * sizeof(Register)));
 316     }
 317
 318 }
 319
 320 #endif // JSInterfaceJIT_h