| /* |
| * Copyright (C) 2010 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef JSInterfaceJIT_h |
| #define JSInterfaceJIT_h |
| |
| #include "JITCode.h" |
| #include "JITStubs.h" |
| #include "JSImmediate.h" |
| #include "MacroAssembler.h" |
| #include "RegisterFile.h" |
| #include <wtf/AlwaysInline.h> |
| #include <wtf/Vector.h> |
| |
| namespace JSC { |
| class JSInterfaceJIT : public MacroAssembler { |
| public: |
| // NOTES: |
| // |
| // regT0 has two special meanings. The return value from a stub |
| // call will always be in regT0, and by default (unless |
| // a register is specified) emitPutVirtualRegister() will store |
| // the value from regT0. |
| // |
| // regT3 is required to be callee-preserved. |
| // |
| // tempRegister2 is has no such dependencies. It is important that |
| // on x86/x86-64 it is ecx for performance reasons, since the |
| // MacroAssembler will need to plant register swaps if it is not - |
| // however the code will still function correctly. |
| #if CPU(X86_64) |
| static const RegisterID returnValueRegister = X86Registers::eax; |
| static const RegisterID cachedResultRegister = X86Registers::eax; |
| static const RegisterID firstArgumentRegister = X86Registers::edi; |
| |
| static const RegisterID timeoutCheckRegister = X86Registers::r12; |
| static const RegisterID callFrameRegister = X86Registers::r13; |
| static const RegisterID tagTypeNumberRegister = X86Registers::r14; |
| static const RegisterID tagMaskRegister = X86Registers::r15; |
| |
| static const RegisterID regT0 = X86Registers::eax; |
| static const RegisterID regT1 = X86Registers::edx; |
| static const RegisterID regT2 = X86Registers::ecx; |
| static const RegisterID regT3 = X86Registers::ebx; |
| |
| static const FPRegisterID fpRegT0 = X86Registers::xmm0; |
| static const FPRegisterID fpRegT1 = X86Registers::xmm1; |
| static const FPRegisterID fpRegT2 = X86Registers::xmm2; |
| static const FPRegisterID fpRegT3 = X86Registers::xmm3; |
| #elif CPU(X86) |
| static const RegisterID returnValueRegister = X86Registers::eax; |
| static const RegisterID cachedResultRegister = X86Registers::eax; |
| // On x86 we always use fastcall conventions = but on |
| // OS X if might make more sense to just use regparm. |
| static const RegisterID firstArgumentRegister = X86Registers::ecx; |
| |
| static const RegisterID timeoutCheckRegister = X86Registers::esi; |
| static const RegisterID callFrameRegister = X86Registers::edi; |
| |
| static const RegisterID regT0 = X86Registers::eax; |
| static const RegisterID regT1 = X86Registers::edx; |
| static const RegisterID regT2 = X86Registers::ecx; |
| static const RegisterID regT3 = X86Registers::ebx; |
| |
| static const FPRegisterID fpRegT0 = X86Registers::xmm0; |
| static const FPRegisterID fpRegT1 = X86Registers::xmm1; |
| static const FPRegisterID fpRegT2 = X86Registers::xmm2; |
| static const FPRegisterID fpRegT3 = X86Registers::xmm3; |
| #elif CPU(ARM_THUMB2) |
| static const RegisterID returnValueRegister = ARMRegisters::r0; |
| static const RegisterID cachedResultRegister = ARMRegisters::r0; |
| static const RegisterID firstArgumentRegister = ARMRegisters::r0; |
| |
| static const RegisterID regT0 = ARMRegisters::r0; |
| static const RegisterID regT1 = ARMRegisters::r1; |
| static const RegisterID regT2 = ARMRegisters::r2; |
| static const RegisterID regT3 = ARMRegisters::r4; |
| |
| static const RegisterID callFrameRegister = ARMRegisters::r5; |
| static const RegisterID timeoutCheckRegister = ARMRegisters::r6; |
| |
| static const FPRegisterID fpRegT0 = ARMRegisters::d0; |
| static const FPRegisterID fpRegT1 = ARMRegisters::d1; |
| static const FPRegisterID fpRegT2 = ARMRegisters::d2; |
| static const FPRegisterID fpRegT3 = ARMRegisters::d3; |
| #elif CPU(ARM_TRADITIONAL) |
| static const RegisterID returnValueRegister = ARMRegisters::r0; |
| static const RegisterID cachedResultRegister = ARMRegisters::r0; |
| static const RegisterID firstArgumentRegister = ARMRegisters::r0; |
| |
| static const RegisterID timeoutCheckRegister = ARMRegisters::r5; |
| static const RegisterID callFrameRegister = ARMRegisters::r4; |
| |
| static const RegisterID regT0 = ARMRegisters::r0; |
| static const RegisterID regT1 = ARMRegisters::r1; |
| static const RegisterID regT2 = ARMRegisters::r2; |
| // Callee preserved |
| static const RegisterID regT3 = ARMRegisters::r7; |
| |
| static const RegisterID regS0 = ARMRegisters::S0; |
| // Callee preserved |
| static const RegisterID regS1 = ARMRegisters::S1; |
| |
| static const RegisterID regStackPtr = ARMRegisters::sp; |
| static const RegisterID regLink = ARMRegisters::lr; |
| |
| static const FPRegisterID fpRegT0 = ARMRegisters::d0; |
| static const FPRegisterID fpRegT1 = ARMRegisters::d1; |
| static const FPRegisterID fpRegT2 = ARMRegisters::d2; |
| static const FPRegisterID fpRegT3 = ARMRegisters::d3; |
| #elif CPU(MIPS) |
| static const RegisterID returnValueRegister = MIPSRegisters::v0; |
| static const RegisterID cachedResultRegister = MIPSRegisters::v0; |
| static const RegisterID firstArgumentRegister = MIPSRegisters::a0; |
| |
| // regT0 must be v0 for returning a 32-bit value. |
| static const RegisterID regT0 = MIPSRegisters::v0; |
| |
| // regT1 must be v1 for returning a pair of 32-bit value. |
| static const RegisterID regT1 = MIPSRegisters::v1; |
| |
| static const RegisterID regT2 = MIPSRegisters::t4; |
| |
| // regT3 must be saved in the callee, so use an S register. |
| static const RegisterID regT3 = MIPSRegisters::s2; |
| |
| static const RegisterID callFrameRegister = MIPSRegisters::s0; |
| static const RegisterID timeoutCheckRegister = MIPSRegisters::s1; |
| |
| static const FPRegisterID fpRegT0 = MIPSRegisters::f4; |
| static const FPRegisterID fpRegT1 = MIPSRegisters::f6; |
| static const FPRegisterID fpRegT2 = MIPSRegisters::f8; |
| static const FPRegisterID fpRegT3 = MIPSRegisters::f10; |
| #else |
| #error "JIT not supported on this platform." |
| #endif |
| |
| inline Jump emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload); |
| inline Jump emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst); |
| inline Jump emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch); |
| |
| #if USE(JSVALUE32_64) |
| inline Jump emitJumpIfNotJSCell(unsigned virtualRegisterIndex); |
| inline Address tagFor(unsigned index, RegisterID base = callFrameRegister); |
| #endif |
| |
| #if USE(JSVALUE32) || USE(JSVALUE64) |
| Jump emitJumpIfImmediateNumber(RegisterID reg); |
| Jump emitJumpIfNotImmediateNumber(RegisterID reg); |
| void emitFastArithImmToInt(RegisterID reg); |
| #endif |
| |
| inline Address payloadFor(unsigned index, RegisterID base = callFrameRegister); |
| inline Address addressFor(unsigned index, RegisterID base = callFrameRegister); |
| }; |
| |
| struct ThunkHelpers { |
| static unsigned stringImplDataOffset() { return WebCore::StringImpl::dataOffset(); } |
| static unsigned jsStringLengthOffset() { return OBJECT_OFFSETOF(JSString, m_length); } |
| static unsigned jsStringValueOffset() { return OBJECT_OFFSETOF(JSString, m_value); } |
| }; |
| |
| #if USE(JSVALUE32_64) |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload) |
| { |
| loadPtr(payloadFor(virtualRegisterIndex), payload); |
| return emitJumpIfNotJSCell(virtualRegisterIndex); |
| } |
| |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotJSCell(unsigned virtualRegisterIndex) |
| { |
| ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex); |
| return branch32(NotEqual, tagFor(virtualRegisterIndex), Imm32(JSValue::CellTag)); |
| } |
| |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst) |
| { |
| ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex); |
| loadPtr(payloadFor(virtualRegisterIndex), dst); |
| return branch32(NotEqual, tagFor(virtualRegisterIndex), Imm32(JSValue::Int32Tag)); |
| } |
| |
| inline JSInterfaceJIT::Address JSInterfaceJIT::tagFor(unsigned virtualRegisterIndex, RegisterID base) |
| { |
| ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex); |
| return Address(base, (virtualRegisterIndex * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)); |
| } |
| |
| inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(unsigned virtualRegisterIndex, RegisterID base) |
| { |
| ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex); |
| return Address(base, (virtualRegisterIndex * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)); |
| } |
| |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch) |
| { |
| ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex); |
| loadPtr(tagFor(virtualRegisterIndex), scratch); |
| Jump isDouble = branch32(Below, scratch, Imm32(JSValue::LowestTag)); |
| Jump notInt = branch32(NotEqual, scratch, Imm32(JSValue::Int32Tag)); |
| loadPtr(payloadFor(virtualRegisterIndex), scratch); |
| convertInt32ToDouble(scratch, dst); |
| Jump done = jump(); |
| isDouble.link(this); |
| loadDouble(addressFor(virtualRegisterIndex), dst); |
| done.link(this); |
| return notInt; |
| } |
| #endif |
| |
| #if USE(JSVALUE64) |
| ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfImmediateNumber(RegisterID reg) |
| { |
| return branchTestPtr(NonZero, reg, tagTypeNumberRegister); |
| } |
| ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotImmediateNumber(RegisterID reg) |
| { |
| return branchTestPtr(Zero, reg, tagTypeNumberRegister); |
| } |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID dst) |
| { |
| loadPtr(addressFor(virtualRegisterIndex), dst); |
| return branchTestPtr(NonZero, dst, tagMaskRegister); |
| } |
| |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst) |
| { |
| loadPtr(addressFor(virtualRegisterIndex), dst); |
| Jump result = branchPtr(Below, dst, tagTypeNumberRegister); |
| zeroExtend32ToPtr(dst, dst); |
| return result; |
| } |
| |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch) |
| { |
| loadPtr(addressFor(virtualRegisterIndex), scratch); |
| Jump notNumber = emitJumpIfNotImmediateNumber(scratch); |
| Jump notInt = branchPtr(Below, scratch, tagTypeNumberRegister); |
| convertInt32ToDouble(scratch, dst); |
| Jump done = jump(); |
| notInt.link(this); |
| addPtr(tagTypeNumberRegister, scratch); |
| movePtrToDouble(scratch, dst); |
| done.link(this); |
| return notNumber; |
| } |
| |
| ALWAYS_INLINE void JSInterfaceJIT::emitFastArithImmToInt(RegisterID) |
| { |
| } |
| |
| #endif |
| |
| #if USE(JSVALUE32) |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID dst) |
| { |
| loadPtr(addressFor(virtualRegisterIndex), dst); |
| return branchTest32(NonZero, dst, Imm32(JSImmediate::TagMask)); |
| } |
| |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst) |
| { |
| loadPtr(addressFor(virtualRegisterIndex), dst); |
| Jump result = branchTest32(Zero, dst, Imm32(JSImmediate::TagTypeNumber)); |
| rshift32(Imm32(JSImmediate::IntegerPayloadShift), dst); |
| return result; |
| } |
| |
| inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned, FPRegisterID, RegisterID) |
| { |
| ASSERT_NOT_REACHED(); |
| return jump(); |
| } |
| |
| ALWAYS_INLINE void JSInterfaceJIT::emitFastArithImmToInt(RegisterID reg) |
| { |
| rshift32(Imm32(JSImmediate::IntegerPayloadShift), reg); |
| } |
| |
| #endif |
| |
| #if !USE(JSVALUE32_64) |
| inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(unsigned virtualRegisterIndex, RegisterID base) |
| { |
| ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex); |
| return addressFor(virtualRegisterIndex, base); |
| } |
| #endif |
| |
| inline JSInterfaceJIT::Address JSInterfaceJIT::addressFor(unsigned virtualRegisterIndex, RegisterID base) |
| { |
| ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex); |
| return Address(base, (virtualRegisterIndex * sizeof(Register))); |
| } |
| |
| } |
| |
| #endif // JSInterfaceJIT_h |
