--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/jit/JSInterfaceJIT.h Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,320 @@
+/*
+ * 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