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 fpRegT3 = 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