diff -r 000000000000 -r 6474c204b198 js/src/jit/mips/Trampoline-mips.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/js/src/jit/mips/Trampoline-mips.cpp Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,997 @@ +/* -*- 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 "jscompartment.h" + +#include "jit/Bailouts.h" +#include "jit/IonFrames.h" +#include "jit/IonLinker.h" +#include "jit/IonSpewer.h" +#include "jit/JitCompartment.h" +#include "jit/mips/Bailouts-mips.h" +#include "jit/mips/BaselineHelpers-mips.h" +#ifdef JS_ION_PERF +# include "jit/PerfSpewer.h" +#endif +#include "jit/VMFunctions.h" + +#include "jit/ExecutionMode-inl.h" + +using namespace js; +using namespace js::jit; + +static_assert(sizeof(uintptr_t) == sizeof(uint32_t), "Not 64-bit clean."); + +struct EnterJITRegs +{ + double f30; + double f28; + double f26; + double f24; + double f22; + double f20; + + // empty slot for alignment + uintptr_t align; + + // non-volatile registers. + uintptr_t ra; + uintptr_t s7; + uintptr_t s6; + uintptr_t s5; + uintptr_t s4; + uintptr_t s3; + uintptr_t s2; + uintptr_t s1; + uintptr_t s0; +}; + +struct EnterJITArgs +{ + // First 4 argumet placeholders + void *jitcode; // <- sp points here when function is entered. + int maxArgc; + Value *maxArgv; + InterpreterFrame *fp; + + // Arguments on stack + CalleeToken calleeToken; + JSObject *scopeChain; + size_t numStackValues; + Value *vp; +}; + +static void +GenerateReturn(MacroAssembler &masm, int returnCode) +{ + MOZ_ASSERT(masm.framePushed() == sizeof(EnterJITRegs)); + + // Restore non-volatile registers + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, s0)), s0); + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, s1)), s1); + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, s2)), s2); + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, s3)), s3); + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, s4)), s4); + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, s5)), s5); + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, s6)), s6); + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, s7)), s7); + masm.loadPtr(Address(StackPointer, offsetof(EnterJITRegs, ra)), ra); + + // Restore non-volatile floating point registers + masm.loadDouble(Address(StackPointer, offsetof(EnterJITRegs, f20)), f20); + masm.loadDouble(Address(StackPointer, offsetof(EnterJITRegs, f22)), f22); + masm.loadDouble(Address(StackPointer, offsetof(EnterJITRegs, f24)), f24); + masm.loadDouble(Address(StackPointer, offsetof(EnterJITRegs, f26)), f26); + masm.loadDouble(Address(StackPointer, offsetof(EnterJITRegs, f28)), f28); + masm.loadDouble(Address(StackPointer, offsetof(EnterJITRegs, f30)), f30); + + masm.freeStack(sizeof(EnterJITRegs)); + + masm.branch(ra); +} + +static void +GeneratePrologue(MacroAssembler &masm) +{ + // Save non-volatile registers. These must be saved by the trampoline, + // rather than the JIT'd code, because they are scanned by the conservative + // scanner. + masm.reserveStack(sizeof(EnterJITRegs)); + masm.storePtr(s0, Address(StackPointer, offsetof(EnterJITRegs, s0))); + masm.storePtr(s1, Address(StackPointer, offsetof(EnterJITRegs, s1))); + masm.storePtr(s2, Address(StackPointer, offsetof(EnterJITRegs, s2))); + masm.storePtr(s3, Address(StackPointer, offsetof(EnterJITRegs, s3))); + masm.storePtr(s4, Address(StackPointer, offsetof(EnterJITRegs, s4))); + masm.storePtr(s5, Address(StackPointer, offsetof(EnterJITRegs, s5))); + masm.storePtr(s6, Address(StackPointer, offsetof(EnterJITRegs, s6))); + masm.storePtr(s7, Address(StackPointer, offsetof(EnterJITRegs, s7))); + masm.storePtr(ra, Address(StackPointer, offsetof(EnterJITRegs, ra))); + + masm.as_sd(f20, StackPointer, offsetof(EnterJITRegs, f20)); + masm.as_sd(f22, StackPointer, offsetof(EnterJITRegs, f22)); + masm.as_sd(f24, StackPointer, offsetof(EnterJITRegs, f24)); + masm.as_sd(f26, StackPointer, offsetof(EnterJITRegs, f26)); + masm.as_sd(f28, StackPointer, offsetof(EnterJITRegs, f28)); + masm.as_sd(f30, StackPointer, offsetof(EnterJITRegs, f30)); +} + + +/* + * This method generates a trampoline for a c++ function with the following + * signature: + * void enter(void *code, int argc, Value *argv, InterpreterFrame *fp, + * CalleeToken calleeToken, JSObject *scopeChain, Value *vp) + * ...using standard EABI calling convention + */ +JitCode * +JitRuntime::generateEnterJIT(JSContext *cx, EnterJitType type) +{ + const Register reg_code = a0; + const Register reg_argc = a1; + const Register reg_argv = a2; + const Register reg_frame = a3; + + MOZ_ASSERT(OsrFrameReg == reg_frame); + + MacroAssembler masm(cx); + GeneratePrologue(masm); + + const Address slotToken(sp, sizeof(EnterJITRegs) + offsetof(EnterJITArgs, calleeToken)); + const Address slotVp(sp, sizeof(EnterJITRegs) + offsetof(EnterJITArgs, vp)); + + // Save stack pointer into s4 + masm.movePtr(StackPointer, s4); + + // Load calleeToken into s2. + masm.loadPtr(slotToken, s2); + + // Save stack pointer as baseline frame. + if (type == EnterJitBaseline) + masm.movePtr(StackPointer, BaselineFrameReg); + + // Load the number of actual arguments into s3. + masm.loadPtr(slotVp, s3); + masm.unboxInt32(Address(s3, 0), s3); + + /*************************************************************** + Loop over argv vector, push arguments onto stack in reverse order + ***************************************************************/ + + masm.as_sll(s0, reg_argc, 3); // s0 = argc * 8 + masm.addPtr(reg_argv, s0); // s0 = argv + argc * 8 + + // Loop over arguments, copying them from an unknown buffer onto the Ion + // stack so they can be accessed from JIT'ed code. + Label header, footer; + // If there aren't any arguments, don't do anything + masm.ma_b(s0, reg_argv, &footer, Assembler::BelowOrEqual, ShortJump); + { + masm.bind(&header); + + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), s0); + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + + ValueOperand value = ValueOperand(s6, s7); + masm.loadValue(Address(s0, 0), value); + masm.storeValue(value, Address(StackPointer, 0)); + + masm.ma_b(s0, reg_argv, &header, Assembler::Above, ShortJump); + } + masm.bind(&footer); + + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + masm.storePtr(s3, Address(StackPointer, sizeof(uintptr_t))); // actual arguments + masm.storePtr(s2, Address(StackPointer, 0)); // callee token + + masm.subPtr(StackPointer, s4); + masm.makeFrameDescriptor(s4, JitFrame_Entry); + masm.push(s4); // descriptor + + CodeLabel returnLabel; + if (type == EnterJitBaseline) { + // Handle OSR. + GeneralRegisterSet regs(GeneralRegisterSet::All()); + regs.take(JSReturnOperand); + regs.take(OsrFrameReg); + regs.take(BaselineFrameReg); + regs.take(reg_code); + + const Address slotNumStackValues(BaselineFrameReg, sizeof(EnterJITRegs) + + offsetof(EnterJITArgs, numStackValues)); + const Address slotScopeChain(BaselineFrameReg, sizeof(EnterJITRegs) + + offsetof(EnterJITArgs, scopeChain)); + + Label notOsr; + masm.ma_b(OsrFrameReg, OsrFrameReg, ¬Osr, Assembler::Zero, ShortJump); + + Register scratch = regs.takeAny(); + + Register numStackValues = regs.takeAny(); + masm.load32(slotNumStackValues, numStackValues); + + // Push return address, previous frame pointer. + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + masm.ma_li(scratch, returnLabel.dest()); + masm.storePtr(scratch, Address(StackPointer, sizeof(uintptr_t))); + masm.storePtr(BaselineFrameReg, Address(StackPointer, 0)); + + // Reserve frame. + Register framePtr = BaselineFrameReg; + masm.subPtr(Imm32(BaselineFrame::Size()), StackPointer); + masm.movePtr(StackPointer, framePtr); + + // Reserve space for locals and stack values. + masm.ma_sll(scratch, numStackValues, Imm32(3)); + masm.subPtr(scratch, StackPointer); + + // Enter exit frame. + masm.addPtr(Imm32(BaselineFrame::Size() + BaselineFrame::FramePointerOffset), scratch); + masm.makeFrameDescriptor(scratch, JitFrame_BaselineJS); + + // Push frame descriptor and fake return address. + masm.reserveStack(2 * sizeof(uintptr_t)); + masm.storePtr(scratch, Address(StackPointer, sizeof(uintptr_t))); // Frame descriptor + masm.storePtr(zero, Address(StackPointer, 0)); // fake return address + + masm.enterFakeExitFrame(); + + masm.reserveStack(2 * sizeof(uintptr_t)); + masm.storePtr(framePtr, Address(StackPointer, sizeof(uintptr_t))); // BaselineFrame + masm.storePtr(reg_code, Address(StackPointer, 0)); // jitcode + + masm.setupUnalignedABICall(3, scratch); + masm.passABIArg(BaselineFrameReg); // BaselineFrame + masm.passABIArg(OsrFrameReg); // InterpreterFrame + masm.passABIArg(numStackValues); + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, jit::InitBaselineFrameForOsr)); + + Register jitcode = regs.takeAny(); + masm.loadPtr(Address(StackPointer, 0), jitcode); + masm.loadPtr(Address(StackPointer, sizeof(uintptr_t)), framePtr); + masm.freeStack(2 * sizeof(uintptr_t)); + + MOZ_ASSERT(jitcode != ReturnReg); + + Label error; + masm.freeStack(IonExitFrameLayout::SizeWithFooter()); + masm.addPtr(Imm32(BaselineFrame::Size()), framePtr); + masm.branchIfFalseBool(ReturnReg, &error); + + masm.jump(jitcode); + + // OOM: load error value, discard return address and previous frame + // pointer and return. + masm.bind(&error); + masm.movePtr(framePtr, StackPointer); + masm.addPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + masm.moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand); + masm.ma_li(scratch, returnLabel.dest()); + masm.jump(scratch); + + masm.bind(¬Osr); + // Load the scope chain in R1. + MOZ_ASSERT(R1.scratchReg() != reg_code); + masm.loadPtr(slotScopeChain, R1.scratchReg()); + } + + // Call the function with pushing return address to stack. + masm.ma_callIonHalfPush(reg_code); + + if (type == EnterJitBaseline) { + // Baseline OSR will return here. + masm.bind(returnLabel.src()); + if (!masm.addCodeLabel(returnLabel)) + return nullptr; + } + + // Pop arguments off the stack. + // s0 <- 8*argc (size of all arguments we pushed on the stack) + masm.pop(s0); + masm.rshiftPtr(Imm32(4), s0); + masm.addPtr(s0, StackPointer); + + // Store the returned value into the slotVp + masm.loadPtr(slotVp, s1); + masm.storeValue(JSReturnOperand, Address(s1, 0)); + + // Restore non-volatile registers and return. + GenerateReturn(masm, ShortJump); + + Linker linker(masm); + AutoFlushICache afc("GenerateEnterJIT"); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "EnterJIT"); +#endif + + return code; +} + +JitCode * +JitRuntime::generateInvalidator(JSContext *cx) +{ + MacroAssembler masm(cx); + + // NOTE: Members ionScript_ and osiPointReturnAddress_ of + // InvalidationBailoutStack are already on the stack. + static const uint32_t STACK_DATA_SIZE = sizeof(InvalidationBailoutStack) - + 2 * sizeof(uintptr_t); + + // Stack has to be alligned here. If not, we will have to fix it. + masm.checkStackAlignment(); + + // Make room for data on stack. + masm.subPtr(Imm32(STACK_DATA_SIZE), StackPointer); + + // Save general purpose registers + for (uint32_t i = 0; i < Registers::Total; i++) { + Address address = Address(StackPointer, InvalidationBailoutStack::offsetOfRegs() + + i * sizeof(uintptr_t)); + masm.storePtr(Register::FromCode(i), address); + } + + // Save floating point registers + // We can use as_sd because stack is alligned. + for (uint32_t i = 0; i < FloatRegisters::Total; i++) + masm.as_sd(FloatRegister::FromCode(i), StackPointer, + InvalidationBailoutStack::offsetOfFpRegs() + i * sizeof(double)); + + // Pass pointer to InvalidationBailoutStack structure. + masm.movePtr(StackPointer, a0); + + // Reserve place for return value and BailoutInfo pointer + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + // Pass pointer to return value. + masm.ma_addu(a1, StackPointer, Imm32(sizeof(uintptr_t))); + // Pass pointer to BailoutInfo + masm.movePtr(StackPointer, a2); + + masm.setupAlignedABICall(3); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.passABIArg(a2); + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, InvalidationBailout)); + + masm.loadPtr(Address(StackPointer, 0), a2); + masm.loadPtr(Address(StackPointer, sizeof(uintptr_t)), a1); + // Remove the return address, the IonScript, the register state + // (InvaliationBailoutStack) and the space that was allocated for the + // return value. + masm.addPtr(Imm32(sizeof(InvalidationBailoutStack) + 2 * sizeof(uintptr_t)), StackPointer); + // remove the space that this frame was using before the bailout + // (computed by InvalidationBailout) + masm.addPtr(a1, StackPointer); + + // Jump to shared bailout tail. The BailoutInfo pointer has to be in r2. + JitCode *bailoutTail = cx->runtime()->jitRuntime()->getBailoutTail(); + masm.branch(bailoutTail); + + Linker linker(masm); + AutoFlushICache afc("Invalidator"); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + IonSpew(IonSpew_Invalidate, " invalidation thunk created at %p", (void *) code->raw()); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "Invalidator"); +#endif + + return code; +} + +JitCode * +JitRuntime::generateArgumentsRectifier(JSContext *cx, ExecutionMode mode, void **returnAddrOut) +{ + MacroAssembler masm(cx); + + // ArgumentsRectifierReg contains the |nargs| pushed onto the current + // frame. Including |this|, there are (|nargs| + 1) arguments to copy. + MOZ_ASSERT(ArgumentsRectifierReg == s3); + + Register numActArgsReg = t6; + Register calleeTokenReg = t7; + Register numArgsReg = t5; + + // Copy number of actual arguments into numActArgsReg + masm.loadPtr(Address(StackPointer, IonRectifierFrameLayout::offsetOfNumActualArgs()), + numActArgsReg); + + // Load the number of |undefined|s to push into t1. + masm.loadPtr(Address(StackPointer, IonRectifierFrameLayout::offsetOfCalleeToken()), + calleeTokenReg); + masm.load16ZeroExtend(Address(calleeTokenReg, JSFunction::offsetOfNargs()), numArgsReg); + + masm.ma_subu(t1, numArgsReg, s3); + + masm.moveValue(UndefinedValue(), ValueOperand(t3, t4)); + + masm.movePtr(StackPointer, t2); // Save %sp. + + // Push undefined. + { + Label undefLoopTop; + masm.bind(&undefLoopTop); + + masm.subPtr(Imm32(sizeof(Value)), StackPointer); + masm.storeValue(ValueOperand(t3, t4), Address(StackPointer, 0)); + masm.sub32(Imm32(1), t1); + + masm.ma_b(t1, t1, &undefLoopTop, Assembler::NonZero, ShortJump); + } + + // Get the topmost argument. + masm.ma_sll(t0, s3, Imm32(3)); // t0 <- nargs * 8 + masm.addPtr(t0, t2); // t2 <- t2(saved sp) + nargs * 8 + masm.addPtr(Imm32(sizeof(IonRectifierFrameLayout)), t2); + + // Push arguments, |nargs| + 1 times (to include |this|). + { + Label copyLoopTop, initialSkip; + + masm.ma_b(&initialSkip, ShortJump); + + masm.bind(©LoopTop); + masm.subPtr(Imm32(sizeof(Value)), t2); + masm.sub32(Imm32(1), s3); + + masm.bind(&initialSkip); + + MOZ_ASSERT(sizeof(Value) == 2 * sizeof(uint32_t)); + // Read argument and push to stack. + masm.subPtr(Imm32(sizeof(Value)), StackPointer); + masm.load32(Address(t2, NUNBOX32_TYPE_OFFSET), t0); + masm.store32(t0, Address(StackPointer, NUNBOX32_TYPE_OFFSET)); + masm.load32(Address(t2, NUNBOX32_PAYLOAD_OFFSET), t0); + masm.store32(t0, Address(StackPointer, NUNBOX32_PAYLOAD_OFFSET)); + + masm.ma_b(s3, s3, ©LoopTop, Assembler::NonZero, ShortJump); + } + + // translate the framesize from values into bytes + masm.ma_addu(t0, numArgsReg, Imm32(1)); + masm.lshiftPtr(Imm32(3), t0); + + // Construct sizeDescriptor. + masm.makeFrameDescriptor(t0, JitFrame_Rectifier); + + // Construct IonJSFrameLayout. + masm.subPtr(Imm32(3 * sizeof(uintptr_t)), StackPointer); + // Push actual arguments. + masm.storePtr(numActArgsReg, Address(StackPointer, 2 * sizeof(uintptr_t))); + // Push callee token. + masm.storePtr(calleeTokenReg, Address(StackPointer, sizeof(uintptr_t))); + // Push frame descriptor. + masm.storePtr(t0, Address(StackPointer, 0)); + + // Call the target function. + // Note that this code assumes the function is JITted. + masm.loadPtr(Address(calleeTokenReg, JSFunction::offsetOfNativeOrScript()), t1); + masm.loadBaselineOrIonRaw(t1, t1, mode, nullptr); + masm.ma_callIonHalfPush(t1); + + uint32_t returnOffset = masm.currentOffset(); + + // arg1 + // ... + // argN + // num actual args + // callee token + // sizeDescriptor <- sp now + // return address + + // Remove the rectifier frame. + // t0 <- descriptor with FrameType. + masm.loadPtr(Address(StackPointer, 0), t0); + masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), t0); // t0 <- descriptor. + + // Discard descriptor, calleeToken and number of actual arguments. + masm.addPtr(Imm32(3 * sizeof(uintptr_t)), StackPointer); + + // arg1 + // ... + // argN <- sp now; t0 <- frame descriptor + // num actual args + // callee token + // sizeDescriptor + // return address + + // Discard pushed arguments. + masm.addPtr(t0, StackPointer); + + masm.ret(); + Linker linker(masm); + AutoFlushICache afc("ArgumentsRectifier"); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + + CodeOffsetLabel returnLabel(returnOffset); + returnLabel.fixup(&masm); + if (returnAddrOut) + *returnAddrOut = (void *) (code->raw() + returnLabel.offset()); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "ArgumentsRectifier"); +#endif + + return code; +} + +/* There are two different stack layouts when doing bailout. They are + * represented via class BailoutStack. + * + * - First case is when bailout is done trough bailout table. In this case + * table offset is stored in $ra (look at JitRuntime::generateBailoutTable()) + * and thunk code should save it on stack. In this case frameClassId_ cannot + * be NO_FRAME_SIZE_CLASS_ID. Members snapshotOffset_ and padding_ are not on + * the stack. + * + * - Other case is when bailout is done via out of line code (lazy bailout). + * In this case frame size is stored in $ra (look at + * CodeGeneratorMIPS::generateOutOfLineCode()) and thunk code should save it + * on stack. Other difference is that members snapshotOffset_ and padding_ are + * pushed to the stack by CodeGeneratorMIPS::visitOutOfLineBailout(). Field + * frameClassId_ is forced to be NO_FRAME_SIZE_CLASS_ID + * (See: JitRuntime::generateBailoutHandler). + */ +static void +GenerateBailoutThunk(JSContext *cx, MacroAssembler &masm, uint32_t frameClass) +{ + // NOTE: Members snapshotOffset_ and padding_ of BailoutStack + // are not stored in this function. + static const uint32_t bailoutDataSize = sizeof(BailoutStack) - 2 * sizeof(uintptr_t); + static const uint32_t bailoutInfoOutParamSize = 2 * sizeof(uintptr_t); + + // Make sure that alignment is proper. + masm.checkStackAlignment(); + + // Make room for data. + masm.subPtr(Imm32(bailoutDataSize), StackPointer); + + // Save general purpose registers. + for (uint32_t i = 0; i < Registers::Total; i++) { + uint32_t off = BailoutStack::offsetOfRegs() + i * sizeof(uintptr_t); + masm.storePtr(Register::FromCode(i), Address(StackPointer, off)); + } + + // Save floating point registers + // We can use as_sd because stack is alligned. + for (uintptr_t i = 0; i < FloatRegisters::Total; i++) + masm.as_sd(FloatRegister::FromCode(i), StackPointer, + BailoutStack::offsetOfFpRegs() + i * sizeof(double)); + + // Store the frameSize_ or tableOffset_ stored in ra + // See: JitRuntime::generateBailoutTable() + // See: CodeGeneratorMIPS::generateOutOfLineCode() + masm.storePtr(ra, Address(StackPointer, BailoutStack::offsetOfFrameSize())); + + // Put frame class to stack + masm.storePtr(ImmWord(frameClass), Address(StackPointer, BailoutStack::offsetOfFrameClass())); + + // Put pointer to BailoutStack as first argument to the Bailout() + masm.movePtr(StackPointer, a0); + // Put pointer to BailoutInfo + masm.subPtr(Imm32(bailoutInfoOutParamSize), StackPointer); + masm.storePtr(ImmPtr(nullptr), Address(StackPointer, 0)); + masm.movePtr(StackPointer, a1); + + masm.setupAlignedABICall(2); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, Bailout)); + + // Get BailoutInfo pointer + masm.loadPtr(Address(StackPointer, 0), a2); + + // Remove both the bailout frame and the topmost Ion frame's stack. + if (frameClass == NO_FRAME_SIZE_CLASS_ID) { + // Load frameSize from stack + masm.loadPtr(Address(StackPointer, + bailoutInfoOutParamSize + BailoutStack::offsetOfFrameSize()), a1); + + // Remove complete BailoutStack class and data after it + masm.addPtr(Imm32(sizeof(BailoutStack) + bailoutInfoOutParamSize), StackPointer); + // Remove frame size srom stack + masm.addPtr(a1, StackPointer); + } else { + uint32_t frameSize = FrameSizeClass::FromClass(frameClass).frameSize(); + // Remove the data this fuction added and frame size. + masm.addPtr(Imm32(bailoutDataSize + bailoutInfoOutParamSize + frameSize), StackPointer); + } + + // Jump to shared bailout tail. The BailoutInfo pointer has to be in a2. + JitCode *bailoutTail = cx->runtime()->jitRuntime()->getBailoutTail(); + masm.branch(bailoutTail); +} + +JitCode * +JitRuntime::generateBailoutTable(JSContext *cx, uint32_t frameClass) +{ + MacroAssembler masm(cx); + + Label bailout; + for (size_t i = 0; i < BAILOUT_TABLE_SIZE; i++) { + // Calculate offset to the end of table + int32_t offset = (BAILOUT_TABLE_SIZE - i) * BAILOUT_TABLE_ENTRY_SIZE; + + // We use the 'ra' as table offset later in GenerateBailoutThunk + masm.as_bal(BOffImm16(offset)); + masm.nop(); + } + masm.bind(&bailout); + + GenerateBailoutThunk(cx, masm, frameClass); + + Linker linker(masm); + AutoFlushICache afc("BailoutTable"); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "BailoutTable"); +#endif + + return code; +} + +JitCode * +JitRuntime::generateBailoutHandler(JSContext *cx) +{ + MacroAssembler masm(cx); + GenerateBailoutThunk(cx, masm, NO_FRAME_SIZE_CLASS_ID); + + Linker linker(masm); + AutoFlushICache afc("BailoutHandler"); + 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) +{ + MOZ_ASSERT(functionWrappers_); + MOZ_ASSERT(functionWrappers_->initialized()); + VMWrapperMap::AddPtr p = functionWrappers_->lookupForAdd(&f); + if (p) + return p->value(); + + MacroAssembler masm(cx); + + GeneralRegisterSet regs = GeneralRegisterSet(Register::Codes::WrapperMask); + + static_assert((Register::Codes::VolatileMask & ~Register::Codes::WrapperMask) == 0, + "Wrapper register set should be a superset of Volatile register set."); + + // The context is the first argument; a0 is the first argument register. + Register cxreg = a0; + regs.take(cxreg); + + // We're aligned to an exit frame, so link it up. + masm.enterExitFrameAndLoadContext(&f, cxreg, regs.getAny(), f.executionMode); + + // Save the base of the argument set stored on the stack. + Register argsBase = InvalidReg; + if (f.explicitArgs) { + argsBase = t1; // Use temporary register. + regs.take(argsBase); + masm.ma_addu(argsBase, StackPointer, Imm32(IonExitFrameLayout::SizeWithFooter())); + } + + // Reserve space for the outparameter. + Register outReg = InvalidReg; + switch (f.outParam) { + case Type_Value: + outReg = t0; // Use temporary register. + regs.take(outReg); + // Value outparam has to be 8 byte aligned because the called + // function can use sdc1 or ldc1 instructions to access it. + masm.reserveStack((StackAlignment - sizeof(uintptr_t)) + sizeof(Value)); + masm.alignPointerUp(StackPointer, outReg, StackAlignment); + break; + + case Type_Handle: + outReg = t0; + regs.take(outReg); + if (f.outParamRootType == VMFunction::RootValue) { + // Value outparam has to be 8 byte aligned because the called + // function can use sdc1 or ldc1 instructions to access it. + masm.reserveStack((StackAlignment - sizeof(uintptr_t)) + sizeof(Value)); + masm.alignPointerUp(StackPointer, outReg, StackAlignment); + masm.storeValue(UndefinedValue(), Address(outReg, 0)); + } + else { + masm.PushEmptyRooted(f.outParamRootType); + masm.movePtr(StackPointer, outReg); + } + break; + + case Type_Bool: + case Type_Int32: + MOZ_ASSERT(sizeof(uintptr_t) == sizeof(uint32_t)); + case Type_Pointer: + outReg = t0; + regs.take(outReg); + masm.reserveStack(sizeof(uintptr_t)); + masm.movePtr(StackPointer, outReg); + break; + + case Type_Double: + outReg = t0; + regs.take(outReg); + // Double outparam has to be 8 byte aligned because the called + // function can use sdc1 or ldc1 instructions to access it. + masm.reserveStack((StackAlignment - sizeof(uintptr_t)) + sizeof(double)); + masm.alignPointerUp(StackPointer, outReg, StackAlignment); + break; + + default: + MOZ_ASSERT(f.outParam == Type_Void); + break; + } + + masm.setupUnalignedABICall(f.argc(), regs.getAny()); + masm.passABIArg(cxreg); + + size_t argDisp = 0; + + // Copy any arguments. + for (uint32_t explicitArg = 0; explicitArg < f.explicitArgs; explicitArg++) { + MoveOperand from; + switch (f.argProperties(explicitArg)) { + case VMFunction::WordByValue: + masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::GENERAL); + argDisp += sizeof(uint32_t); + break; + case VMFunction::DoubleByValue: + // Values should be passed by reference, not by value, so we + // assert that the argument is a double-precision float. + MOZ_ASSERT(f.argPassedInFloatReg(explicitArg)); + masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::DOUBLE); + argDisp += sizeof(double); + break; + case VMFunction::WordByRef: + masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE_ADDRESS), + MoveOp::GENERAL); + argDisp += sizeof(uint32_t); + break; + case VMFunction::DoubleByRef: + masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE_ADDRESS), + MoveOp::GENERAL); + argDisp += sizeof(double); + break; + } + } + + // 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, v0, v0, masm.failureLabel(f.executionMode)); + break; + case Type_Bool: + // Called functions return bools, which are 0/false and non-zero/true + masm.branchIfFalseBool(v0, 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: + if (f.outParamRootType == VMFunction::RootValue) { + masm.alignPointerUp(StackPointer, SecondScratchReg, StackAlignment); + masm.loadValue(Address(SecondScratchReg, 0), JSReturnOperand); + masm.freeStack((StackAlignment - sizeof(uintptr_t)) + sizeof(Value)); + } + else { + masm.popRooted(f.outParamRootType, ReturnReg, JSReturnOperand); + } + break; + + case Type_Value: + masm.alignPointerUp(StackPointer, SecondScratchReg, StackAlignment); + masm.loadValue(Address(SecondScratchReg, 0), JSReturnOperand); + masm.freeStack((StackAlignment - sizeof(uintptr_t)) + sizeof(Value)); + break; + + case Type_Int32: + MOZ_ASSERT(sizeof(uintptr_t) == sizeof(uint32_t)); + case Type_Pointer: + masm.load32(Address(StackPointer, 0), ReturnReg); + masm.freeStack(sizeof(uintptr_t)); + break; + + case Type_Bool: + masm.load8ZeroExtend(Address(StackPointer, 0), ReturnReg); + masm.freeStack(sizeof(uintptr_t)); + break; + + case Type_Double: + if (cx->runtime()->jitSupportsFloatingPoint) { + masm.alignPointerUp(StackPointer, SecondScratchReg, StackAlignment); + // Address is aligned, so we can use as_ld. + masm.as_ld(ReturnFloatReg, SecondScratchReg, 0); + } else { + masm.assumeUnreachable("Unable to load into float reg, with no FP support."); + } + masm.freeStack((StackAlignment - sizeof(uintptr_t)) + sizeof(double)); + break; + + default: + MOZ_ASSERT(f.outParam == Type_Void); + break; + } + masm.leaveExitFrame(); + masm.retn(Imm32(sizeof(IonExitFrameLayout) + + f.explicitStackSlots() * sizeof(uintptr_t) + + f.extraValuesToPop * sizeof(Value))); + + Linker linker(masm); + AutoFlushICache afc("VMWrapper"); + JitCode *wrapper = linker.newCode(cx, JSC::OTHER_CODE); + if (!wrapper) + return nullptr; + + // 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; + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(wrapper, "VMWrapper"); +#endif + + return wrapper; +} + +JitCode * +JitRuntime::generatePreBarrier(JSContext *cx, MIRType type) +{ + MacroAssembler masm(cx); + + RegisterSet save; + if (cx->runtime()->jitSupportsFloatingPoint) { + save = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), + FloatRegisterSet(FloatRegisters::VolatileMask)); + } else { + save = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), + FloatRegisterSet()); + } + masm.PushRegsInMask(save); + + MOZ_ASSERT(PreBarrierReg == a1); + masm.movePtr(ImmPtr(cx->runtime()), a0); + + masm.setupUnalignedABICall(2, a2); + masm.passABIArg(a0); + masm.passABIArg(a1); + + if (type == MIRType_Value) { + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, MarkValueFromIon)); + } else { + MOZ_ASSERT(type == MIRType_Shape); + masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, MarkShapeFromIon)); + } + + masm.PopRegsInMask(save); + masm.ret(); + + Linker linker(masm); + AutoFlushICache afc("PreBarrier"); + 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(cx); + + Register scratch1 = t0; + Register scratch2 = t1; + + // Load BaselineFrame pointer in scratch1. + masm.movePtr(s5, scratch1); + masm.subPtr(Imm32(BaselineFrame::Size()), scratch1); + + // 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, scratch2); + + JitCode *code = cx->runtime()->jitRuntime()->getVMWrapper(HandleDebugTrapInfo); + if (!code) + return nullptr; + + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + masm.storePtr(ra, Address(StackPointer, sizeof(uintptr_t))); + masm.storePtr(scratch1, Address(StackPointer, 0)); + + 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); + + // ra was restored by EmitLeaveStubFrame + masm.branch(ra); + + masm.bind(&forcedReturn); + masm.loadValue(Address(s5, BaselineFrame::reverseOffsetOfReturnValue()), + JSReturnOperand); + masm.movePtr(s5, StackPointer); + masm.pop(s5); + masm.ret(); + + Linker linker(masm); + AutoFlushICache afc("DebugTrapHandler"); + 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); + AutoFlushICache afc("ExceptionTailStub"); + 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(a1, a2); + + Linker linker(masm); + AutoFlushICache afc("BailoutTailStub"); + JitCode *code = linker.newCode(cx, JSC::OTHER_CODE); + +#ifdef JS_ION_PERF + writePerfSpewerJitCodeProfile(code, "BailoutTailStub"); +#endif + + return code; +} +