| /* -*- 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/IonCompartment.h" |
| #include "jit/IonLinker.h" |
| #include "jit/IonFrames.h" |
| #include "jit/IonLinker.h" |
| #include "jit/IonSpewer.h" |
| #include "jit/Bailouts.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/mips/Bailouts-mips.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; |
| StackFrame* 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 |
| */ |
| IonCode * |
| IonRuntime::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, IonFrame_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, IonFrame_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); |
| AutoFlushCache afc("GenerateEnterJIT"); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerIonCodeProfile(code, "EnterJIT"); |
| #endif |
| |
| return linker.newCode(cx, JSC::OTHER_CODE); |
| } |
| |
| IonCode * |
| IonRuntime::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++) { |
| if (i % 2 == 0) { |
| masm.as_sd(FloatRegister::FromCode(i), StackPointer, |
| InvalidationBailoutStack::offsetOfFpRegs() + (i/2) * 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. |
| IonCode* bailoutTail = cx->runtime()->ionRuntime()->getBailoutTail(); |
| masm.branch(bailoutTail); |
| |
| Linker linker(masm); |
| AutoFlushCache afc("Invalidator"); |
| IonCode* code = linker.newCode(cx, JSC::OTHER_CODE); |
| IonSpew(IonSpew_Invalidate, " invalidation thunk created at %p", (void *) code->raw()); |
| |
| return code; |
| } |
| |
| IonCode * |
| IonRuntime::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, |
| offsetof(JSFunction, nargs) |
| ), 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, IonFrame_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); |
| AutoFlushCache afc("ArgumentsRectifier"); |
| IonCode *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 |
| writePerfSpewerIonCodeProfile(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 IonRuntime::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: IonRuntime::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++) { |
| if (i % 2 == 0) { |
| masm.as_sd(FloatRegister::FromCode(i), StackPointer, |
| BailoutStack::offsetOfFpRegs() + (i/2) * sizeof(double)); |
| } |
| |
| } |
| |
| // Store the frameSize_ or tableOffset_ stored in ra |
| // See: IonRuntime::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(ImmWord((void*)NULL), 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. |
| IonCode* bailoutTail = cx->runtime()->ionRuntime()->getBailoutTail(); |
| masm.branch(bailoutTail); |
| } |
| |
| IonCode * |
| IonRuntime::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); |
| AutoFlushCache afc("BailoutTable"); |
| IonCode *code = linker.newCode(cx, JSC::OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerIonCodeProfile(code, "BailoutTable"); |
| #endif |
| |
| return code; |
| } |
| |
| IonCode * |
| IonRuntime::generateBailoutHandler(JSContext *cx) |
| { |
| MacroAssembler masm(cx); |
| GenerateBailoutThunk(cx, masm, NO_FRAME_SIZE_CLASS_ID); |
| |
| Linker linker(masm); |
| AutoFlushCache afc("BailoutHandler"); |
| IonCode *code = linker.newCode(cx, JSC::OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerIonCodeProfile(code, "BailoutHandler"); |
| #endif |
| |
| return code; |
| } |
| |
| IonCode * |
| IonRuntime::generateVMWrapper(JSContext *cx, const VMFunction &f) |
| { |
| typedef MoveResolver::MoveOperand MoveOperand; |
| |
| 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; |
| |
| 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)); |
| 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, MoveOperand::FLOAT)); |
| argDisp += sizeof(double); |
| break; |
| case VMFunction::WordByRef: |
| masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE)); |
| argDisp += sizeof(uint32_t); |
| break; |
| case VMFunction::DoubleByRef: |
| masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE)); |
| argDisp += sizeof(double); |
| break; |
| } |
| } |
| |
| // Copy the implicit outparam, if any. |
| if (outReg != InvalidReg) |
| masm.passABIArg(outReg); |
| |
| masm.callWithABI(f.wrapped); |
| |
| // Test for failure. |
| Label failureLabel; |
| switch (f.failType()) { |
| case Type_Object: |
| masm.branchTestPtr(Assembler::Zero, v0, v0, &failureLabel); |
| break; |
| case Type_Bool: |
| // Called functions return bools, which are 0/false and non-zero/true |
| masm.branchIfFalseBool(v0, &failureLabel); |
| break; |
| case Type_ParallelResult: |
| // TODO: Remove these comments and warning after proxy object issue is |
| // fixed. |
| // Type_ParallelResult was removed in SpiderMonkey31, so we should be |
| // careful when this is run. |
| // In ARM, it is: |
| // masm.branch32(Assembler::NotEqual, r0, Imm32(TP_SUCCESS), &failure); - arm |
| // In x86, it is: |
| // masm.branchPtr(Assembler::NotEqual, eax, Imm32(TP_SUCCESS), &failure); - x86 |
| SB_LOG(WARNING) << "masm.branchPtr(Assembler::NotEqual, v0, Imm32(TP_SUCCESS), &failureLabel)"; |
| masm.branchPtr(Assembler::NotEqual, v0, Imm32(TP_SUCCESS), &failureLabel); |
| |
| break; |
| default: |
| JS_NOT_REACHED("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; |
| |
| default: |
| MOZ_ASSERT(f.outParam == Type_Void); |
| break; |
| } |
| masm.leaveExitFrame(); |
| masm.retn(Imm32(sizeof(IonExitFrameLayout) + |
| f.explicitStackSlots() * sizeof(uintptr_t) + |
| f.extraValuesToPop * sizeof(Value))); |
| |
| masm.bind(&failureLabel); |
| masm.handleFailure(f.executionMode); |
| |
| Linker linker(masm); |
| AutoFlushCache afc("VMWrapper"); |
| IonCode *wrapper = linker.newCode(cx, JSC::OTHER_CODE); |
| if (!wrapper) |
| return NULL; |
| |
| // 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 NULL; |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerIonCodeProfile(wrapper, "VMWrapper"); |
| #endif |
| |
| return wrapper; |
| } |
| |
| IonCode * |
| IonRuntime::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(ImmWord(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); |
| AutoFlushCache afc("PreBarrier"); |
| IonCode *code = linker.newCode(cx, JSC::OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerIonCodeProfile(code, "PreBarrier"); |
| #endif |
| |
| return code; |
| } |
| |
| typedef bool (*HandleDebugTrapFn)(JSContext *, BaselineFrame *, uint8_t *, JSBool *); |
| static const VMFunction HandleDebugTrapInfo = FunctionInfo<HandleDebugTrapFn>(HandleDebugTrap); |
| |
| IonCode * |
| IonRuntime::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(ImmWord((void*)NULL), BaselineStubReg); |
| EmitEnterStubFrame(masm, scratch2); |
| |
| IonCompartment* ion = cx->compartment()->ionCompartment(); |
| IonCode* code = ion->getVMWrapper(HandleDebugTrapInfo); |
| if (!code) |
| return NULL; |
| |
| 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); |
| AutoFlushCache afc("DebugTrapHandler"); |
| IonCode *codeDbg = linker.newCode(cx, JSC::OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerIonCodeProfile(codeDbg, "DebugTrapHandler"); |
| #endif |
| |
| return codeDbg; |
| } |
| |
| |
| IonCode * |
| IonRuntime::generateExceptionTailStub(JSContext *cx) |
| { |
| MacroAssembler masm; |
| |
| masm.handleFailureWithHandlerTail(); |
| |
| Linker linker(masm); |
| AutoFlushCache afc("ExceptionTailStub"); |
| IonCode *code = linker.newCode(cx, JSC::OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerIonCodeProfile(code, "ExceptionTailStub"); |
| #endif |
| |
| return code; |
| } |
| |
| IonCode * |
| IonRuntime::generateBailoutTailStub(JSContext *cx) |
| { |
| MacroAssembler masm; |
| |
| masm.generateBailoutTail(a1, a2); |
| |
| Linker linker(masm); |
| AutoFlushCache afc("BailoutTailStub"); |
| IonCode *code = linker.newCode(cx, JSC::OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerIonCodeProfile(code, "BailoutTailStub"); |
| #endif |
| |
| return code; |
| } |
| |
