diff -r 000000000000 -r 6474c204b198 js/src/jit/x64/Trampoline-x64.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/js/src/jit/x64/Trampoline-x64.cpp Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,819 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * vim: set ts=8 sts=4 et sw=4 tw=99: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "jit/Bailouts.h" +#include "jit/IonFrames.h" +#include "jit/IonLinker.h" +#include "jit/JitCompartment.h" +#ifdef JS_ION_PERF +# include "jit/PerfSpewer.h" +#endif +#include "jit/VMFunctions.h" +#include "jit/x64/BaselineHelpers-x64.h" + +using namespace js; +using namespace js::jit; + +// All registers to save and restore. This includes the stack pointer, since we +// use the ability to reference register values on the stack by index. +static const RegisterSet AllRegs = + RegisterSet(GeneralRegisterSet(Registers::AllMask), + FloatRegisterSet(FloatRegisters::AllMask)); + +/* This method generates a trampoline on x64 for a c++ function with + * the following signature: + * bool blah(void *code, int argc, Value *argv, JSObject *scopeChain, + * Value *vp) + * ...using standard x64 fastcall calling convention + */ +JitCode * +JitRuntime::generateEnterJIT(JSContext *cx, EnterJitType type) +{ + MacroAssembler masm(cx); + + const Register reg_code = IntArgReg0; + const Register reg_argc = IntArgReg1; + const Register reg_argv = IntArgReg2; + JS_ASSERT(OsrFrameReg == IntArgReg3); + +#if defined(_WIN64) + const Operand token = Operand(rbp, 16 + ShadowStackSpace); + const Operand scopeChain = Operand(rbp, 24 + ShadowStackSpace); + const Operand numStackValuesAddr = Operand(rbp, 32 + ShadowStackSpace); + const Operand result = Operand(rbp, 40 + ShadowStackSpace); +#else + const Register token = IntArgReg4; + const Register scopeChain = IntArgReg5; + const Operand numStackValuesAddr = Operand(rbp, 16 + ShadowStackSpace); + const Operand result = Operand(rbp, 24 + ShadowStackSpace); +#endif + + // Save old stack frame pointer, set new stack frame pointer. + masm.push(rbp); + masm.mov(rsp, rbp); + + // Save non-volatile registers. These must be saved by the trampoline, rather + // than by the JIT'd code, because they are scanned by the conservative scanner. + masm.push(rbx); + masm.push(r12); + masm.push(r13); + masm.push(r14); + masm.push(r15); +#if defined(_WIN64) + masm.push(rdi); + masm.push(rsi); + + // 16-byte aligment for movdqa + masm.subq(Imm32(16 * 10 + 8), rsp); + + masm.movdqa(xmm6, Operand(rsp, 16 * 0)); + masm.movdqa(xmm7, Operand(rsp, 16 * 1)); + masm.movdqa(xmm8, Operand(rsp, 16 * 2)); + masm.movdqa(xmm9, Operand(rsp, 16 * 3)); + masm.movdqa(xmm10, Operand(rsp, 16 * 4)); + masm.movdqa(xmm11, Operand(rsp, 16 * 5)); + masm.movdqa(xmm12, Operand(rsp, 16 * 6)); + masm.movdqa(xmm13, Operand(rsp, 16 * 7)); + masm.movdqa(xmm14, Operand(rsp, 16 * 8)); + masm.movdqa(xmm15, Operand(rsp, 16 * 9)); +#endif + + // Push the EnterJIT sps mark. + masm.spsMarkJit(&cx->runtime()->spsProfiler, rbp, rbx); + + // Save arguments passed in registers needed after function call. + masm.push(result); + + // Remember stack depth without padding and arguments. + masm.mov(rsp, r14); + + // Remember number of bytes occupied by argument vector + masm.mov(reg_argc, r13); + masm.shll(Imm32(3), r13); + + // Guarantee 16-byte alignment. + // We push argc, callee token, frame size, and return address. + // The latter two are 16 bytes together, so we only consider argc and the + // token. + masm.mov(rsp, r12); + masm.subq(r13, r12); + masm.subq(Imm32(8), r12); + masm.andl(Imm32(0xf), r12); + masm.subq(r12, rsp); + + /*************************************************************** + Loop over argv vector, push arguments onto stack in reverse order + ***************************************************************/ + + // r13 still stores the number of bytes in the argument vector. + masm.addq(reg_argv, r13); // r13 points above last argument. + + // while r13 > rdx, push arguments. + { + Label header, footer; + masm.bind(&header); + + masm.cmpq(r13, reg_argv); + masm.j(AssemblerX86Shared::BelowOrEqual, &footer); + + masm.subq(Imm32(8), r13); + masm.push(Operand(r13, 0)); + masm.jmp(&header); + + masm.bind(&footer); + } + + // Push the number of actual arguments. |result| is used to store the + // actual number of arguments without adding an extra argument to the enter + // JIT. + masm.movq(result, reg_argc); + masm.unboxInt32(Operand(reg_argc, 0), reg_argc); + masm.push(reg_argc); + + // Push the callee token. + masm.push(token); + + /***************************************************************** + Push the number of bytes we've pushed so far on the stack and call + *****************************************************************/ + masm.subq(rsp, r14); + + // Create a frame descriptor. + masm.makeFrameDescriptor(r14, JitFrame_Entry); + masm.push(r14); + + CodeLabel returnLabel; + if (type == EnterJitBaseline) { + // Handle OSR. + GeneralRegisterSet regs(GeneralRegisterSet::All()); + regs.takeUnchecked(OsrFrameReg); + regs.take(rbp); + regs.take(reg_code); + + // Ensure that |scratch| does not end up being JSReturnOperand. + // Do takeUnchecked because on Win64/x64, reg_code (IntArgReg0) and JSReturnOperand are + // the same (rcx). See bug 849398. + regs.takeUnchecked(JSReturnOperand); + Register scratch = regs.takeAny(); + + Label notOsr; + masm.branchTestPtr(Assembler::Zero, OsrFrameReg, OsrFrameReg, ¬Osr); + + Register numStackValues = regs.takeAny(); + masm.movq(numStackValuesAddr, numStackValues); + + // Push return address, previous frame pointer. + masm.mov(returnLabel.dest(), scratch); + masm.push(scratch); + masm.push(rbp); + + // Reserve frame. + Register framePtr = rbp; + masm.subPtr(Imm32(BaselineFrame::Size()), rsp); + masm.mov(rsp, framePtr); + +#ifdef XP_WIN + // Can't push large frames blindly on windows. Touch frame memory incrementally. + masm.mov(numStackValues, scratch); + masm.lshiftPtr(Imm32(3), scratch); + masm.subPtr(scratch, framePtr); + { + masm.movePtr(rsp, scratch); + masm.subPtr(Imm32(WINDOWS_BIG_FRAME_TOUCH_INCREMENT), scratch); + + Label touchFrameLoop; + Label touchFrameLoopEnd; + masm.bind(&touchFrameLoop); + masm.branchPtr(Assembler::Below, scratch, framePtr, &touchFrameLoopEnd); + masm.store32(Imm32(0), Address(scratch, 0)); + masm.subPtr(Imm32(WINDOWS_BIG_FRAME_TOUCH_INCREMENT), scratch); + masm.jump(&touchFrameLoop); + masm.bind(&touchFrameLoopEnd); + } + masm.mov(rsp, framePtr); +#endif + + // Reserve space for locals and stack values. + Register valuesSize = regs.takeAny(); + masm.mov(numStackValues, valuesSize); + masm.shll(Imm32(3), valuesSize); + masm.subPtr(valuesSize, rsp); + + // Enter exit frame. + masm.addPtr(Imm32(BaselineFrame::Size() + BaselineFrame::FramePointerOffset), valuesSize); + masm.makeFrameDescriptor(valuesSize, JitFrame_BaselineJS); + masm.push(valuesSize); + masm.push(Imm32(0)); // Fake return address. + masm.enterFakeExitFrame(); + + regs.add(valuesSize); + + masm.push(framePtr); + masm.push(reg_code); + + masm.setupUnalignedABICall(3, scratch); + masm.passABIArg(framePtr); // BaselineFrame + masm.passABIArg(OsrFrameReg); // InterpreterFrame + masm.passABIArg(numStackValues); + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, jit::InitBaselineFrameForOsr)); + + masm.pop(reg_code); + masm.pop(framePtr); + + JS_ASSERT(reg_code != ReturnReg); + + Label error; + masm.addPtr(Imm32(IonExitFrameLayout::SizeWithFooter()), rsp); + masm.addPtr(Imm32(BaselineFrame::Size()), framePtr); + masm.branchIfFalseBool(ReturnReg, &error); + + masm.jump(reg_code); + + // OOM: load error value, discard return address and previous frame + // pointer and return. + masm.bind(&error); + masm.mov(framePtr, rsp); + masm.addPtr(Imm32(2 * sizeof(uintptr_t)), rsp); + masm.moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand); + masm.mov(returnLabel.dest(), scratch); + masm.jump(scratch); + + masm.bind(¬Osr); + masm.movq(scopeChain, R1.scratchReg()); + } + + // Call function. + masm.call(reg_code); + + if (type == EnterJitBaseline) { + // Baseline OSR will return here. + masm.bind(returnLabel.src()); + if (!masm.addCodeLabel(returnLabel)) + return nullptr; + } + + // Pop arguments and padding from stack. + masm.pop(r14); // Pop and decode descriptor. + masm.shrq(Imm32(FRAMESIZE_SHIFT), r14); + masm.addq(r14, rsp); // Remove arguments. + + /***************************************************************** + Place return value where it belongs, pop all saved registers + *****************************************************************/ + masm.pop(r12); // vp + masm.storeValue(JSReturnOperand, Operand(r12, 0)); + + // Unwind the sps mark. + masm.spsUnmarkJit(&cx->runtime()->spsProfiler, rbx); + + // Restore non-volatile registers. +#if defined(_WIN64) + masm.movdqa(Operand(rsp, 16 * 0), xmm6); + masm.movdqa(Operand(rsp, 16 * 1), xmm7); + masm.movdqa(Operand(rsp, 16 * 2), xmm8); + masm.movdqa(Operand(rsp, 16 * 3), xmm9); + masm.movdqa(Operand(rsp, 16 * 4), xmm10); + masm.movdqa(Operand(rsp, 16 * 5), xmm11); + masm.movdqa(Operand(rsp, 16 * 6), xmm12); + masm.movdqa(Operand(rsp, 16 * 7), xmm13); + masm.movdqa(Operand(rsp, 16 * 8), xmm14); + masm.movdqa(Operand(rsp, 16 * 9), xmm15); + + masm.addq(Imm32(16 * 10 + 8), rsp); + + masm.pop(rsi); + masm.pop(rdi); +#endif + masm.pop(r15); + masm.pop(r14); + masm.pop(r13); + masm.pop(r12); + masm.pop(rbx); + + // Restore frame pointer and return. + masm.pop(rbp); + masm.ret(); + + Linker linker(masm); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "EnterJIT"); +#endif + + return code; +} + +JitCode * +JitRuntime::generateInvalidator(JSContext *cx) +{ + AutoIonContextAlloc aica(cx); + MacroAssembler masm(cx); + + // See explanatory comment in x86's JitRuntime::generateInvalidator. + + masm.addq(Imm32(sizeof(uintptr_t)), rsp); + + // Push registers such that we can access them from [base + code]. + masm.PushRegsInMask(AllRegs); + + masm.movq(rsp, rax); // Argument to jit::InvalidationBailout. + + // Make space for InvalidationBailout's frameSize outparam. + masm.reserveStack(sizeof(size_t)); + masm.movq(rsp, rbx); + + // Make space for InvalidationBailout's bailoutInfo outparam. + masm.reserveStack(sizeof(void *)); + masm.movq(rsp, r9); + + masm.setupUnalignedABICall(3, rdx); + masm.passABIArg(rax); + masm.passABIArg(rbx); + masm.passABIArg(r9); + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, InvalidationBailout)); + + masm.pop(r9); // Get the bailoutInfo outparam. + masm.pop(rbx); // Get the frameSize outparam. + + // Pop the machine state and the dead frame. + masm.lea(Operand(rsp, rbx, TimesOne, sizeof(InvalidationBailoutStack)), rsp); + + // Jump to shared bailout tail. The BailoutInfo pointer has to be in r9. + JitCode *bailoutTail = cx->runtime()->jitRuntime()->getBailoutTail(); + masm.jmp(bailoutTail); + + Linker linker(masm); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "Invalidator"); +#endif + + return code; +} + +JitCode * +JitRuntime::generateArgumentsRectifier(JSContext *cx, ExecutionMode mode, void **returnAddrOut) +{ + // Do not erase the frame pointer in this function. + + MacroAssembler masm(cx); + + // ArgumentsRectifierReg contains the |nargs| pushed onto the current frame. + // Including |this|, there are (|nargs| + 1) arguments to copy. + JS_ASSERT(ArgumentsRectifierReg == r8); + + // Load the number of |undefined|s to push into %rcx. + masm.loadPtr(Address(rsp, IonRectifierFrameLayout::offsetOfCalleeToken()), rax); + masm.movzwl(Operand(rax, JSFunction::offsetOfNargs()), rcx); + masm.subq(r8, rcx); + + // Copy the number of actual arguments + masm.loadPtr(Address(rsp, IonRectifierFrameLayout::offsetOfNumActualArgs()), rdx); + + masm.moveValue(UndefinedValue(), r10); + + masm.movq(rsp, r9); // Save %rsp. + + // Push undefined. + { + Label undefLoopTop; + masm.bind(&undefLoopTop); + + masm.push(r10); + masm.subl(Imm32(1), rcx); + masm.j(Assembler::NonZero, &undefLoopTop); + } + + // Get the topmost argument. + BaseIndex b = BaseIndex(r9, r8, TimesEight, sizeof(IonRectifierFrameLayout)); + masm.lea(Operand(b), rcx); + + // Push arguments, |nargs| + 1 times (to include |this|). + masm.addl(Imm32(1), r8); + { + Label copyLoopTop; + + masm.bind(©LoopTop); + masm.push(Operand(rcx, 0x0)); + masm.subq(Imm32(sizeof(Value)), rcx); + masm.subl(Imm32(1), r8); + masm.j(Assembler::NonZero, ©LoopTop); + } + + // Construct descriptor. + masm.subq(rsp, r9); + masm.makeFrameDescriptor(r9, JitFrame_Rectifier); + + // Construct IonJSFrameLayout. + masm.push(rdx); // numActualArgs + masm.push(rax); // callee token + masm.push(r9); // descriptor + + // Call the target function. + // Note that this code assumes the function is JITted. + masm.loadPtr(Address(rax, JSFunction::offsetOfNativeOrScript()), rax); + masm.loadBaselineOrIonRaw(rax, rax, mode, nullptr); + masm.call(rax); + uint32_t returnOffset = masm.currentOffset(); + + // Remove the rectifier frame. + masm.pop(r9); // r9 <- descriptor with FrameType. + masm.shrq(Imm32(FRAMESIZE_SHIFT), r9); + masm.pop(r11); // Discard calleeToken. + masm.pop(r11); // Discard numActualArgs. + masm.addq(r9, rsp); // Discard pushed arguments. + + masm.ret(); + + Linker linker(masm); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "ArgumentsRectifier"); +#endif + + CodeOffsetLabel returnLabel(returnOffset); + returnLabel.fixup(&masm); + if (returnAddrOut) + *returnAddrOut = (void *) (code->raw() + returnLabel.offset()); + return code; +} + +static void +GenerateBailoutThunk(JSContext *cx, MacroAssembler &masm, uint32_t frameClass) +{ + // Push registers such that we can access them from [base + code]. + masm.PushRegsInMask(AllRegs); + + // Get the stack pointer into a register, pre-alignment. + masm.movq(rsp, r8); + + // Make space for Bailout's bailoutInfo outparam. + masm.reserveStack(sizeof(void *)); + masm.movq(rsp, r9); + + // Call the bailout function. + masm.setupUnalignedABICall(2, rax); + masm.passABIArg(r8); + masm.passABIArg(r9); + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, Bailout)); + + masm.pop(r9); // Get the bailoutInfo outparam. + + // Stack is: + // [frame] + // snapshotOffset + // frameSize + // [bailoutFrame] + // + // Remove both the bailout frame and the topmost Ion frame's stack. + static const uint32_t BailoutDataSize = sizeof(void *) * Registers::Total + + sizeof(double) * FloatRegisters::Total; + masm.addq(Imm32(BailoutDataSize), rsp); + masm.pop(rcx); + masm.lea(Operand(rsp, rcx, TimesOne, sizeof(void *)), rsp); + + // Jump to shared bailout tail. The BailoutInfo pointer has to be in r9. + JitCode *bailoutTail = cx->runtime()->jitRuntime()->getBailoutTail(); + masm.jmp(bailoutTail); +} + +JitCode * +JitRuntime::generateBailoutTable(JSContext *cx, uint32_t frameClass) +{ + MOZ_ASSUME_UNREACHABLE("x64 does not use bailout tables"); +} + +JitCode * +JitRuntime::generateBailoutHandler(JSContext *cx) +{ + MacroAssembler masm; + + GenerateBailoutThunk(cx, masm, NO_FRAME_SIZE_CLASS_ID); + + Linker linker(masm); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "BailoutHandler"); +#endif + + return code; +} + +JitCode * +JitRuntime::generateVMWrapper(JSContext *cx, const VMFunction &f) +{ + JS_ASSERT(!StackKeptAligned); + JS_ASSERT(functionWrappers_); + JS_ASSERT(functionWrappers_->initialized()); + VMWrapperMap::AddPtr p = functionWrappers_->lookupForAdd(&f); + if (p) + return p->value(); + + // Generate a separated code for the wrapper. + MacroAssembler masm; + + // Avoid conflicts with argument registers while discarding the result after + // the function call. + GeneralRegisterSet regs = GeneralRegisterSet(Register::Codes::WrapperMask); + + // Wrapper register set is a superset of Volatile register set. + JS_STATIC_ASSERT((Register::Codes::VolatileMask & ~Register::Codes::WrapperMask) == 0); + + // The context is the first argument. + Register cxreg = IntArgReg0; + regs.take(cxreg); + + // Stack is: + // ... frame ... + // +12 [args] + // +8 descriptor + // +0 returnAddress + // + // We're aligned to an exit frame, so link it up. + masm.enterExitFrameAndLoadContext(&f, cxreg, regs.getAny(), f.executionMode); + + // Save the current stack pointer as the base for copying arguments. + Register argsBase = InvalidReg; + if (f.explicitArgs) { + argsBase = r10; + regs.take(argsBase); + masm.lea(Operand(rsp,IonExitFrameLayout::SizeWithFooter()), argsBase); + } + + // Reserve space for the outparameter. + Register outReg = InvalidReg; + switch (f.outParam) { + case Type_Value: + outReg = regs.takeAny(); + masm.reserveStack(sizeof(Value)); + masm.movq(esp, outReg); + break; + + case Type_Handle: + outReg = regs.takeAny(); + masm.PushEmptyRooted(f.outParamRootType); + masm.movq(esp, outReg); + break; + + case Type_Int32: + case Type_Bool: + outReg = regs.takeAny(); + masm.reserveStack(sizeof(int32_t)); + masm.movq(esp, outReg); + break; + + case Type_Double: + outReg = regs.takeAny(); + masm.reserveStack(sizeof(double)); + masm.movq(esp, outReg); + break; + + case Type_Pointer: + outReg = regs.takeAny(); + masm.reserveStack(sizeof(uintptr_t)); + masm.movq(esp, outReg); + break; + + default: + JS_ASSERT(f.outParam == Type_Void); + break; + } + + masm.setupUnalignedABICall(f.argc(), regs.getAny()); + masm.passABIArg(cxreg); + + size_t argDisp = 0; + + // Copy arguments. + for (uint32_t explicitArg = 0; explicitArg < f.explicitArgs; explicitArg++) { + MoveOperand from; + switch (f.argProperties(explicitArg)) { + case VMFunction::WordByValue: + if (f.argPassedInFloatReg(explicitArg)) + masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::DOUBLE); + else + masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::GENERAL); + argDisp += sizeof(void *); + break; + case VMFunction::WordByRef: + masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE_ADDRESS), + MoveOp::GENERAL); + argDisp += sizeof(void *); + break; + case VMFunction::DoubleByValue: + case VMFunction::DoubleByRef: + MOZ_ASSUME_UNREACHABLE("NYI: x64 callVM should not be used with 128bits values."); + } + } + + // Copy the implicit outparam, if any. + if (outReg != InvalidReg) + masm.passABIArg(outReg); + + masm.callWithABI(f.wrapped); + + // Test for failure. + switch (f.failType()) { + case Type_Object: + masm.branchTestPtr(Assembler::Zero, rax, rax, masm.failureLabel(f.executionMode)); + break; + case Type_Bool: + masm.testb(rax, rax); + masm.j(Assembler::Zero, masm.failureLabel(f.executionMode)); + break; + default: + MOZ_ASSUME_UNREACHABLE("unknown failure kind"); + } + + // Load the outparam and free any allocated stack. + switch (f.outParam) { + case Type_Handle: + masm.popRooted(f.outParamRootType, ReturnReg, JSReturnOperand); + break; + + case Type_Value: + masm.loadValue(Address(esp, 0), JSReturnOperand); + masm.freeStack(sizeof(Value)); + break; + + case Type_Int32: + masm.load32(Address(esp, 0), ReturnReg); + masm.freeStack(sizeof(int32_t)); + break; + + case Type_Bool: + masm.load8ZeroExtend(Address(esp, 0), ReturnReg); + masm.freeStack(sizeof(int32_t)); + break; + + case Type_Double: + JS_ASSERT(cx->runtime()->jitSupportsFloatingPoint); + masm.loadDouble(Address(esp, 0), ReturnFloatReg); + masm.freeStack(sizeof(double)); + break; + + case Type_Pointer: + masm.loadPtr(Address(esp, 0), ReturnReg); + masm.freeStack(sizeof(uintptr_t)); + break; + + default: + JS_ASSERT(f.outParam == Type_Void); + break; + } + masm.leaveExitFrame(); + masm.retn(Imm32(sizeof(IonExitFrameLayout) + + f.explicitStackSlots() * sizeof(void *) + + f.extraValuesToPop * sizeof(Value))); + + Linker linker(masm); + JitCode *wrapper = linker.newCode(cx, JSC::OTHER_CODE); + if (!wrapper) + return nullptr; + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(wrapper, "VMWrapper"); +#endif + + // linker.newCode may trigger a GC and sweep functionWrappers_ so we have to + // use relookupOrAdd instead of add. + if (!functionWrappers_->relookupOrAdd(p, &f, wrapper)) + return nullptr; + + return wrapper; +} + +JitCode * +JitRuntime::generatePreBarrier(JSContext *cx, MIRType type) +{ + MacroAssembler masm; + + RegisterSet regs = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), + FloatRegisterSet(FloatRegisters::VolatileMask)); + masm.PushRegsInMask(regs); + + JS_ASSERT(PreBarrierReg == rdx); + masm.mov(ImmPtr(cx->runtime()), rcx); + + masm.setupUnalignedABICall(2, rax); + masm.passABIArg(rcx); + masm.passABIArg(rdx); + if (type == MIRType_Value) { + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, MarkValueFromIon)); + } else { + JS_ASSERT(type == MIRType_Shape); + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, MarkShapeFromIon)); + } + + masm.PopRegsInMask(regs); + masm.ret(); + + Linker linker(masm); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "PreBarrier"); +#endif + + return code; +} + +typedef bool (*HandleDebugTrapFn)(JSContext *, BaselineFrame *, uint8_t *, bool *); +static const VMFunction HandleDebugTrapInfo = FunctionInfo(HandleDebugTrap); + +JitCode * +JitRuntime::generateDebugTrapHandler(JSContext *cx) +{ + MacroAssembler masm; + + Register scratch1 = rax; + Register scratch2 = rcx; + Register scratch3 = rdx; + + // Load the return address in scratch1. + masm.loadPtr(Address(rsp, 0), scratch1); + + // Load BaselineFrame pointer in scratch2. + masm.mov(rbp, scratch2); + masm.subPtr(Imm32(BaselineFrame::Size()), scratch2); + + // Enter a stub frame and call the HandleDebugTrap VM function. Ensure + // the stub frame has a nullptr ICStub pointer, since this pointer is marked + // during GC. + masm.movePtr(ImmPtr(nullptr), BaselineStubReg); + EmitEnterStubFrame(masm, scratch3); + + JitCode *code = cx->runtime()->jitRuntime()->getVMWrapper(HandleDebugTrapInfo); + if (!code) + return nullptr; + + masm.push(scratch1); + masm.push(scratch2); + EmitCallVM(code, masm); + + EmitLeaveStubFrame(masm); + + // If the stub returns |true|, we have to perform a forced return + // (return from the JS frame). If the stub returns |false|, just return + // from the trap stub so that execution continues at the current pc. + Label forcedReturn; + masm.branchTest32(Assembler::NonZero, ReturnReg, ReturnReg, &forcedReturn); + masm.ret(); + + masm.bind(&forcedReturn); + masm.loadValue(Address(ebp, BaselineFrame::reverseOffsetOfReturnValue()), + JSReturnOperand); + masm.mov(rbp, rsp); + masm.pop(rbp); + masm.ret(); + + Linker linker(masm); + JitCode *codeDbg = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(codeDbg, "DebugTrapHandler"); +#endif + + return codeDbg; +} + +JitCode * +JitRuntime::generateExceptionTailStub(JSContext *cx) +{ + MacroAssembler masm; + + masm.handleFailureWithHandlerTail(); + + Linker linker(masm); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "ExceptionTailStub"); +#endif + + return code; +} + +JitCode * +JitRuntime::generateBailoutTailStub(JSContext *cx) +{ + MacroAssembler masm; + + masm.generateBailoutTail(rdx, r9); + + Linker linker(masm); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "BailoutTailStub"); +#endif + + return code; +}