| /* -*- 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 "mozilla/DebugOnly.h" |
| |
| #include "jscompartment.h" |
| |
| #include "jit/Bailouts.h" |
| #include "jit/JitCompartment.h" |
| #include "jit/JitFrames.h" |
| #include "jit/JitSpewer.h" |
| #include "jit/Linker.h" |
| #include "jit/mips32/Bailouts-mips32.h" |
| #include "jit/mips32/SharedICHelpers-mips32.h" |
| #ifdef JS_ION_PERF |
| # include "jit/PerfSpewer.h" |
| #endif |
| #include "jit/VMFunctions.h" |
| |
| #include "jit/MacroAssembler-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 mozilla::DebugOnly<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 |
| ***************************************************************/ |
| |
| // if we are constructing, that also needs to include newTarget |
| { |
| Label noNewTarget; |
| masm.branchTest32(Assembler::Zero, s2, Imm32(CalleeToken_FunctionConstructing), |
| &noNewTarget); |
| |
| masm.add32(Imm32(1), reg_argc); |
| |
| masm.bind(&noNewTarget); |
| } |
| |
| 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; |
| CodeLabel oomReturnLabel; |
| if (type == EnterJitBaseline) { |
| // Handle OSR. |
| AllocatableGeneralRegisterSet regs(GeneralRegisterSet::All()); |
| regs.take(OsrFrameReg); |
| regs.take(BaselineFrameReg); |
| regs.take(reg_code); |
| regs.take(ReturnReg); |
| |
| 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. |
| masm.subPtr(Imm32(sizeof(uintptr_t)), StackPointer); |
| masm.ma_li(scratch, returnLabel.patchAt()); |
| masm.storePtr(scratch, Address(StackPointer, 0)); |
| |
| // Push previous frame pointer. |
| masm.subPtr(Imm32(sizeof(uintptr_t)), StackPointer); |
| 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 |
| |
| // No GC things to mark, push a bare token. |
| masm.enterFakeExitFrame(ExitFrameLayoutBareToken); |
| |
| 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(scratch); |
| masm.passABIArg(BaselineFrameReg); // BaselineFrame |
| masm.passABIArg(OsrFrameReg); // InterpreterFrame |
| masm.passABIArg(numStackValues); |
| masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, jit::InitBaselineFrameForOsr)); |
| |
| regs.add(OsrFrameReg); |
| regs.take(JSReturnOperand); |
| Register jitcode = regs.takeAny(); |
| masm.loadPtr(Address(StackPointer, 0), jitcode); |
| masm.loadPtr(Address(StackPointer, sizeof(uintptr_t)), framePtr); |
| masm.freeStack(2 * sizeof(uintptr_t)); |
| |
| Label error; |
| masm.freeStack(ExitFrameLayout::SizeWithFooter()); |
| masm.addPtr(Imm32(BaselineFrame::Size()), framePtr); |
| masm.branchIfFalseBool(ReturnReg, &error); |
| |
| // If OSR-ing, then emit instrumentation for setting lastProfilerFrame |
| // if profiler instrumentation is enabled. |
| { |
| Label skipProfilingInstrumentation; |
| Register realFramePtr = numStackValues; |
| AbsoluteAddress addressOfEnabled(cx->runtime()->spsProfiler.addressOfEnabled()); |
| masm.branch32(Assembler::Equal, addressOfEnabled, Imm32(0), |
| &skipProfilingInstrumentation); |
| masm.ma_addu(realFramePtr, framePtr, Imm32(sizeof(void*))); |
| masm.profilerEnterFrame(realFramePtr, scratch); |
| masm.bind(&skipProfilingInstrumentation); |
| } |
| |
| 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, oomReturnLabel.patchAt()); |
| masm.jump(scratch); |
| |
| masm.bind(¬Osr); |
| // Load the scope chain in R1. |
| MOZ_ASSERT(R1.scratchReg() != reg_code); |
| masm.loadPtr(slotScopeChain, R1.scratchReg()); |
| } |
| |
| // The call will push the return address on the stack, thus we check that |
| // the stack would be aligned once the call is complete. |
| masm.assertStackAlignment(JitStackAlignment, sizeof(uintptr_t)); |
| |
| // Call the function with pushing return address to stack. |
| masm.callJitNoProfiler(reg_code); |
| |
| if (type == EnterJitBaseline) { |
| // Baseline OSR will return here. |
| masm.bind(returnLabel.target()); |
| masm.addCodeLabel(returnLabel); |
| masm.bind(oomReturnLabel.target()); |
| masm.addCodeLabel(oomReturnLabel); |
| } |
| |
| // Pop arguments off the stack. |
| // s0 <- 8*argc (size of all arguments we pushed on the stack) |
| masm.pop(s0); |
| masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), 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<NoGC>(cx, 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::TotalDouble; i ++) |
| masm.as_sd(FloatRegister::FromIndex(i, FloatRegister::Double), 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(); |
| 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<NoGC>(cx, OTHER_CODE); |
| JitSpew(JitSpew_IonInvalidate, " invalidation thunk created at %p", (void*) code->raw()); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerJitCodeProfile(code, "Invalidator"); |
| #endif |
| |
| return code; |
| } |
| |
| JitCode* |
| JitRuntime::generateArgumentsRectifier(JSContext* cx, 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, RectifierFrameLayout::offsetOfNumActualArgs()), |
| numActArgsReg); |
| |
| // Load the number of |undefined|s to push into t1. |
| masm.loadPtr(Address(StackPointer, RectifierFrameLayout::offsetOfCalleeToken()), |
| calleeTokenReg); |
| masm.mov(calleeTokenReg, numArgsReg); |
| masm.andPtr(Imm32(CalleeTokenMask), numArgsReg); |
| masm.load16ZeroExtend(Address(numArgsReg, JSFunction::offsetOfNargs()), numArgsReg); |
| |
| masm.as_subu(t1, numArgsReg, s3); |
| |
| // Get the topmost argument. |
| masm.ma_sll(t0, s3, Imm32(3)); // t0 <- nargs * 8 |
| masm.as_addu(t2, sp, t0); // t2 <- sp + nargs * 8 |
| masm.addPtr(Imm32(sizeof(RectifierFrameLayout)), t2); |
| |
| { |
| Label notConstructing; |
| |
| masm.branchTest32(Assembler::Zero, calleeTokenReg, Imm32(CalleeToken_FunctionConstructing), |
| ¬Constructing); |
| |
| // Add sizeof(Value) to overcome |this| |
| masm.subPtr(Imm32(sizeof(Value)), StackPointer); |
| masm.load32(Address(t2, NUNBOX32_TYPE_OFFSET + sizeof(Value)), t0); |
| masm.store32(t0, Address(StackPointer, NUNBOX32_TYPE_OFFSET)); |
| masm.load32(Address(t2, NUNBOX32_PAYLOAD_OFFSET + sizeof(Value)), t0); |
| masm.store32(t0, Address(StackPointer, NUNBOX32_PAYLOAD_OFFSET)); |
| |
| // Include the newly pushed newTarget value in the frame size |
| // calculated below. |
| masm.add32(Imm32(1), numArgsReg); |
| |
| masm.bind(¬Constructing); |
| } |
| |
| // Push undefined. |
| masm.moveValue(UndefinedValue(), ValueOperand(t3, t4)); |
| { |
| 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); |
| } |
| |
| // 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 JitFrameLayout. |
| 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.andPtr(Imm32(CalleeTokenMask), calleeTokenReg); |
| masm.loadPtr(Address(calleeTokenReg, JSFunction::offsetOfNativeOrScript()), t1); |
| masm.loadBaselineOrIonRaw(t1, t1, nullptr); |
| uint32_t returnOffset = masm.callJitNoProfiler(t1); |
| |
| // 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<NoGC>(cx, OTHER_CODE); |
| |
| if (returnAddrOut) |
| *returnAddrOut = (void*) (code->raw() + returnOffset); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerJitCodeProfile(code, "ArgumentsRectifier"); |
| #endif |
| |
| return code; |
| } |
| |
| // NOTE: Members snapshotOffset_ and padding_ of BailoutStack |
| // are not stored in PushBailoutFrame(). |
| static const uint32_t bailoutDataSize = sizeof(BailoutStack) - 2 * sizeof(uintptr_t); |
| static const uint32_t bailoutInfoOutParamSize = 2 * sizeof(uintptr_t); |
| |
| /* 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 |
| PushBailoutFrame(MacroAssembler& masm, uint32_t frameClass, Register spArg) |
| { |
| // 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 (uint32_t i = 0; i < FloatRegisters::TotalDouble; i++) |
| masm.as_sd(FloatRegister::FromIndex(i, FloatRegister::Double), 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, spArg); |
| } |
| |
| static void |
| GenerateBailoutThunk(JSContext* cx, MacroAssembler& masm, uint32_t frameClass) |
| { |
| PushBailoutFrame(masm, frameClass, a0); |
| |
| // Put pointer to BailoutInfo |
| masm.subPtr(Imm32(bailoutInfoOutParamSize), StackPointer); |
| masm.storePtr(ImmPtr(nullptr), Address(StackPointer, 0)); |
| masm.movePtr(StackPointer, a1); |
| |
| masm.setupAlignedABICall(); |
| 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<NoGC>(cx, 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<NoGC>(cx, 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); |
| |
| AllocatableGeneralRegisterSet regs(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.enterExitFrame(&f); |
| masm.loadJSContext(cxreg); |
| |
| // 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(ExitFrameLayout::SizeWithFooter())); |
| } |
| |
| masm.alignStackPointer(); |
| |
| // Reserve space for the outparameter. Reserve sizeof(Value) for every |
| // case so that stack stays aligned. |
| uint32_t outParamSize = 0; |
| switch (f.outParam) { |
| case Type_Value: |
| outParamSize = sizeof(Value); |
| masm.reserveStack(outParamSize); |
| break; |
| |
| case Type_Handle: |
| { |
| uint32_t pushed = masm.framePushed(); |
| masm.PushEmptyRooted(f.outParamRootType); |
| outParamSize = masm.framePushed() - pushed; |
| } |
| break; |
| |
| case Type_Bool: |
| case Type_Int32: |
| MOZ_ASSERT(sizeof(uintptr_t) == sizeof(uint32_t)); |
| case Type_Pointer: |
| outParamSize = sizeof(uintptr_t); |
| masm.reserveStack(outParamSize); |
| break; |
| |
| case Type_Double: |
| outParamSize = sizeof(double); |
| masm.reserveStack(outParamSize); |
| break; |
| default: |
| MOZ_ASSERT(f.outParam == Type_Void); |
| break; |
| } |
| |
| uint32_t outParamOffset = 0; |
| if (f.outParam != Type_Void) { |
| // Make sure that stack is double aligned after outParam. |
| MOZ_ASSERT(outParamSize <= sizeof(double)); |
| outParamOffset += sizeof(double) - outParamSize; |
| } |
| // Reserve stack for double sized args that are copied to be aligned. |
| outParamOffset += f.doubleByRefArgs() * sizeof(double); |
| |
| Register doubleArgs = t0; |
| masm.reserveStack(outParamOffset); |
| masm.movePtr(StackPointer, doubleArgs); |
| |
| masm.setupAlignedABICall(); |
| masm.passABIArg(cxreg); |
| |
| size_t argDisp = 0; |
| size_t doubleArgDisp = 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: |
| // Copy double sized argument to aligned place. |
| masm.ma_ld(ScratchDoubleReg, Address(argsBase, argDisp)); |
| masm.as_sd(ScratchDoubleReg, doubleArgs, doubleArgDisp); |
| masm.passABIArg(MoveOperand(doubleArgs, doubleArgDisp, MoveOperand::EFFECTIVE_ADDRESS), |
| MoveOp::GENERAL); |
| doubleArgDisp += sizeof(double); |
| argDisp += sizeof(double); |
| break; |
| } |
| } |
| |
| MOZ_ASSERT_IF(f.outParam != Type_Void, |
| doubleArgDisp + sizeof(double) == outParamOffset + outParamSize); |
| |
| // Copy the implicit outparam, if any. |
| if (f.outParam != Type_Void) { |
| masm.passABIArg(MoveOperand(doubleArgs, outParamOffset, MoveOperand::EFFECTIVE_ADDRESS), |
| MoveOp::GENERAL); |
| } |
| |
| masm.callWithABI(f.wrapped); |
| |
| // Test for failure. |
| switch (f.failType()) { |
| case Type_Object: |
| masm.branchTestPtr(Assembler::Zero, v0, v0, masm.failureLabel()); |
| break; |
| case Type_Bool: |
| // Called functions return bools, which are 0/false and non-zero/true |
| masm.branchIfFalseBool(v0, masm.failureLabel()); |
| break; |
| default: |
| MOZ_CRASH("unknown failure kind"); |
| } |
| |
| masm.freeStack(outParamOffset); |
| |
| // 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(StackPointer, 0), JSReturnOperand); |
| masm.freeStack(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.as_ld(ReturnDoubleReg, StackPointer, 0); |
| } else { |
| masm.assumeUnreachable("Unable to load into float reg, with no FP support."); |
| } |
| masm.freeStack(sizeof(double)); |
| break; |
| |
| default: |
| MOZ_ASSERT(f.outParam == Type_Void); |
| break; |
| } |
| |
| masm.restoreStackPointer(); |
| |
| masm.leaveExitFrame(); |
| masm.retn(Imm32(sizeof(ExitFrameLayout) + |
| f.explicitStackSlots() * sizeof(uintptr_t) + |
| f.extraValuesToPop * sizeof(Value))); |
| |
| Linker linker(masm); |
| AutoFlushICache afc("VMWrapper"); |
| JitCode* wrapper = linker.newCode<NoGC>(cx, 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); |
| |
| LiveRegisterSet save; |
| if (cx->runtime()->jitSupportsFloatingPoint) { |
| save.set() = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), |
| FloatRegisterSet(FloatRegisters::VolatileMask)); |
| } else { |
| save.set() = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), |
| FloatRegisterSet()); |
| } |
| masm.PushRegsInMask(save); |
| |
| MOZ_ASSERT(PreBarrierReg == a1); |
| masm.movePtr(ImmPtr(cx->runtime()), a0); |
| |
| masm.setupUnalignedABICall(a2); |
| masm.passABIArg(a0); |
| masm.passABIArg(a1); |
| masm.callWithABI(IonMarkFunction(type)); |
| |
| masm.PopRegsInMask(save); |
| masm.ret(); |
| |
| Linker linker(masm); |
| AutoFlushICache afc("PreBarrier"); |
| JitCode* code = linker.newCode<NoGC>(cx, 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<HandleDebugTrapFn>(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), ICStubReg); |
| EmitBaselineEnterStubFrame(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)); |
| |
| EmitBaselineCallVM(code, masm); |
| |
| EmitBaselineLeaveStubFrame(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); |
| |
| // Before returning, if profiling is turned on, make sure that lastProfilingFrame |
| // is set to the correct caller frame. |
| { |
| Label skipProfilingInstrumentation; |
| AbsoluteAddress addressOfEnabled(cx->runtime()->spsProfiler.addressOfEnabled()); |
| masm.branch32(Assembler::Equal, addressOfEnabled, Imm32(0), &skipProfilingInstrumentation); |
| masm.profilerExitFrame(); |
| masm.bind(&skipProfilingInstrumentation); |
| } |
| |
| masm.ret(); |
| |
| Linker linker(masm); |
| AutoFlushICache afc("DebugTrapHandler"); |
| JitCode* codeDbg = linker.newCode<NoGC>(cx, OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerJitCodeProfile(codeDbg, "DebugTrapHandler"); |
| #endif |
| |
| return codeDbg; |
| } |
| |
| |
| JitCode* |
| JitRuntime::generateExceptionTailStub(JSContext* cx, void* handler) |
| { |
| MacroAssembler masm; |
| |
| masm.handleFailureWithHandlerTail(handler); |
| |
| Linker linker(masm); |
| AutoFlushICache afc("ExceptionTailStub"); |
| JitCode* code = linker.newCode<NoGC>(cx, 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<NoGC>(cx, OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerJitCodeProfile(code, "BailoutTailStub"); |
| #endif |
| |
| return code; |
| } |
| |
| JitCode* |
| JitRuntime::generateProfilerExitFrameTailStub(JSContext* cx) |
| { |
| MacroAssembler masm; |
| |
| Register scratch1 = t0; |
| Register scratch2 = t1; |
| Register scratch3 = t2; |
| Register scratch4 = t3; |
| |
| // |
| // The code generated below expects that the current stack pointer points |
| // to an Ion or Baseline frame, at the state it would be immediately |
| // before a ret(). Thus, after this stub's business is done, it executes |
| // a ret() and returns directly to the caller script, on behalf of the |
| // callee script that jumped to this code. |
| // |
| // Thus the expected stack is: |
| // |
| // StackPointer ----+ |
| // v |
| // ..., ActualArgc, CalleeToken, Descriptor, ReturnAddr |
| // MEM-HI MEM-LOW |
| // |
| // |
| // The generated jitcode is responsible for overwriting the |
| // jitActivation->lastProfilingFrame field with a pointer to the previous |
| // Ion or Baseline jit-frame that was pushed before this one. It is also |
| // responsible for overwriting jitActivation->lastProfilingCallSite with |
| // the return address into that frame. The frame could either be an |
| // immediate "caller" frame, or it could be a frame in a previous |
| // JitActivation (if the current frame was entered from C++, and the C++ |
| // was entered by some caller jit-frame further down the stack). |
| // |
| // So this jitcode is responsible for "walking up" the jit stack, finding |
| // the previous Ion or Baseline JS frame, and storing its address and the |
| // return address into the appropriate fields on the current jitActivation. |
| // |
| // There are a fixed number of different path types that can lead to the |
| // current frame, which is either a baseline or ion frame: |
| // |
| // <Baseline-Or-Ion> |
| // ^ |
| // | |
| // ^--- Ion |
| // | |
| // ^--- Baseline Stub <---- Baseline |
| // | |
| // ^--- Argument Rectifier |
| // | ^ |
| // | | |
| // | ^--- Ion |
| // | | |
| // | ^--- Baseline Stub <---- Baseline |
| // | |
| // ^--- Entry Frame (From C++) |
| // |
| Register actReg = scratch4; |
| AbsoluteAddress activationAddr(GetJitContext()->runtime->addressOfProfilingActivation()); |
| masm.loadPtr(activationAddr, actReg); |
| |
| Address lastProfilingFrame(actReg, JitActivation::offsetOfLastProfilingFrame()); |
| Address lastProfilingCallSite(actReg, JitActivation::offsetOfLastProfilingCallSite()); |
| |
| #ifdef DEBUG |
| // Ensure that frame we are exiting is current lastProfilingFrame |
| { |
| masm.loadPtr(lastProfilingFrame, scratch1); |
| Label checkOk; |
| masm.branchPtr(Assembler::Equal, scratch1, ImmWord(0), &checkOk); |
| masm.branchPtr(Assembler::Equal, StackPointer, scratch1, &checkOk); |
| masm.assumeUnreachable( |
| "Mismatch between stored lastProfilingFrame and current stack pointer."); |
| masm.bind(&checkOk); |
| } |
| #endif |
| |
| // Load the frame descriptor into |scratch1|, figure out what to do depending on its type. |
| masm.loadPtr(Address(StackPointer, JitFrameLayout::offsetOfDescriptor()), scratch1); |
| |
| // Going into the conditionals, we will have: |
| // FrameDescriptor.size in scratch1 |
| // FrameDescriptor.type in scratch2 |
| masm.ma_and(scratch2, scratch1, Imm32((1 << FRAMETYPE_BITS) - 1)); |
| masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), scratch1); |
| |
| // Handling of each case is dependent on FrameDescriptor.type |
| Label handle_IonJS; |
| Label handle_BaselineStub; |
| Label handle_Rectifier; |
| Label handle_IonAccessorIC; |
| Label handle_Entry; |
| Label end; |
| |
| masm.branch32(Assembler::Equal, scratch2, Imm32(JitFrame_IonJS), &handle_IonJS); |
| masm.branch32(Assembler::Equal, scratch2, Imm32(JitFrame_BaselineJS), &handle_IonJS); |
| masm.branch32(Assembler::Equal, scratch2, Imm32(JitFrame_BaselineStub), &handle_BaselineStub); |
| masm.branch32(Assembler::Equal, scratch2, Imm32(JitFrame_Rectifier), &handle_Rectifier); |
| masm.branch32(Assembler::Equal, scratch2, Imm32(JitFrame_IonAccessorIC), &handle_IonAccessorIC); |
| masm.branch32(Assembler::Equal, scratch2, Imm32(JitFrame_Entry), &handle_Entry); |
| |
| masm.assumeUnreachable("Invalid caller frame type when exiting from Ion frame."); |
| |
| // |
| // JitFrame_IonJS |
| // |
| // Stack layout: |
| // ... |
| // Ion-Descriptor |
| // Prev-FP ---> Ion-ReturnAddr |
| // ... previous frame data ... |- Descriptor.Size |
| // ... arguments ... | |
| // ActualArgc | |
| // CalleeToken |- JitFrameLayout::Size() |
| // Descriptor | |
| // FP -----> ReturnAddr | |
| // |
| masm.bind(&handle_IonJS); |
| { |
| // |scratch1| contains Descriptor.size |
| |
| // returning directly to an IonJS frame. Store return addr to frame |
| // in lastProfilingCallSite. |
| masm.loadPtr(Address(StackPointer, JitFrameLayout::offsetOfReturnAddress()), scratch2); |
| masm.storePtr(scratch2, lastProfilingCallSite); |
| |
| // Store return frame in lastProfilingFrame. |
| // scratch2 := StackPointer + Descriptor.size*1 + JitFrameLayout::Size(); |
| masm.as_addu(scratch2, StackPointer, scratch1); |
| masm.ma_addu(scratch2, scratch2, Imm32(JitFrameLayout::Size())); |
| masm.storePtr(scratch2, lastProfilingFrame); |
| masm.ret(); |
| } |
| |
| // |
| // JitFrame_BaselineStub |
| // |
| // Look past the stub and store the frame pointer to |
| // the baselineJS frame prior to it. |
| // |
| // Stack layout: |
| // ... |
| // BL-Descriptor |
| // Prev-FP ---> BL-ReturnAddr |
| // +-----> BL-PrevFramePointer |
| // | ... BL-FrameData ... |
| // | BLStub-Descriptor |
| // | BLStub-ReturnAddr |
| // | BLStub-StubPointer | |
| // +------ BLStub-SavedFramePointer |- Descriptor.Size |
| // ... arguments ... | |
| // ActualArgc | |
| // CalleeToken |- JitFrameLayout::Size() |
| // Descriptor | |
| // FP -----> ReturnAddr | |
| // |
| // We take advantage of the fact that the stub frame saves the frame |
| // pointer pointing to the baseline frame, so a bunch of calculation can |
| // be avoided. |
| // |
| masm.bind(&handle_BaselineStub); |
| { |
| masm.as_addu(scratch3, StackPointer, scratch1); |
| Address stubFrameReturnAddr(scratch3, |
| JitFrameLayout::Size() + |
| BaselineStubFrameLayout::offsetOfReturnAddress()); |
| masm.loadPtr(stubFrameReturnAddr, scratch2); |
| masm.storePtr(scratch2, lastProfilingCallSite); |
| |
| Address stubFrameSavedFramePtr(scratch3, |
| JitFrameLayout::Size() - (2 * sizeof(void*))); |
| masm.loadPtr(stubFrameSavedFramePtr, scratch2); |
| masm.addPtr(Imm32(sizeof(void*)), scratch2); // Skip past BL-PrevFramePtr |
| masm.storePtr(scratch2, lastProfilingFrame); |
| masm.ret(); |
| } |
| |
| |
| // |
| // JitFrame_Rectifier |
| // |
| // The rectifier frame can be preceded by either an IonJS or a |
| // BaselineStub frame. |
| // |
| // Stack layout if caller of rectifier was Ion: |
| // |
| // Ion-Descriptor |
| // Ion-ReturnAddr |
| // ... ion frame data ... |- Rect-Descriptor.Size |
| // < COMMON LAYOUT > |
| // |
| // Stack layout if caller of rectifier was Baseline: |
| // |
| // BL-Descriptor |
| // Prev-FP ---> BL-ReturnAddr |
| // +-----> BL-SavedFramePointer |
| // | ... baseline frame data ... |
| // | BLStub-Descriptor |
| // | BLStub-ReturnAddr |
| // | BLStub-StubPointer | |
| // +------ BLStub-SavedFramePointer |- Rect-Descriptor.Size |
| // ... args to rectifier ... | |
| // < COMMON LAYOUT > |
| // |
| // Common stack layout: |
| // |
| // ActualArgc | |
| // CalleeToken |- IonRectitiferFrameLayout::Size() |
| // Rect-Descriptor | |
| // Rect-ReturnAddr | |
| // ... rectifier data & args ... |- Descriptor.Size |
| // ActualArgc | |
| // CalleeToken |- JitFrameLayout::Size() |
| // Descriptor | |
| // FP -----> ReturnAddr | |
| // |
| masm.bind(&handle_Rectifier); |
| { |
| // scratch2 := StackPointer + Descriptor.size*1 + JitFrameLayout::Size(); |
| masm.as_addu(scratch2, StackPointer, scratch1); |
| masm.add32(Imm32(JitFrameLayout::Size()), scratch2); |
| masm.loadPtr(Address(scratch2, RectifierFrameLayout::offsetOfDescriptor()), scratch3); |
| masm.ma_srl(scratch1, scratch3, Imm32(FRAMESIZE_SHIFT)); |
| masm.and32(Imm32((1 << FRAMETYPE_BITS) - 1), scratch3); |
| |
| // Now |scratch1| contains Rect-Descriptor.Size |
| // and |scratch2| points to Rectifier frame |
| // and |scratch3| contains Rect-Descriptor.Type |
| |
| // Check for either Ion or BaselineStub frame. |
| Label handle_Rectifier_BaselineStub; |
| masm.branch32(Assembler::NotEqual, scratch3, Imm32(JitFrame_IonJS), |
| &handle_Rectifier_BaselineStub); |
| |
| // Handle Rectifier <- IonJS |
| // scratch3 := RectFrame[ReturnAddr] |
| masm.loadPtr(Address(scratch2, RectifierFrameLayout::offsetOfReturnAddress()), scratch3); |
| masm.storePtr(scratch3, lastProfilingCallSite); |
| |
| // scratch3 := RectFrame + Rect-Descriptor.Size + RectifierFrameLayout::Size() |
| masm.as_addu(scratch3, scratch2, scratch1); |
| masm.add32(Imm32(RectifierFrameLayout::Size()), scratch3); |
| masm.storePtr(scratch3, lastProfilingFrame); |
| masm.ret(); |
| |
| // Handle Rectifier <- BaselineStub <- BaselineJS |
| masm.bind(&handle_Rectifier_BaselineStub); |
| #ifdef DEBUG |
| { |
| Label checkOk; |
| masm.branch32(Assembler::Equal, scratch3, Imm32(JitFrame_BaselineStub), &checkOk); |
| masm.assumeUnreachable("Unrecognized frame preceding baselineStub."); |
| masm.bind(&checkOk); |
| } |
| #endif |
| masm.as_addu(scratch3, scratch2, scratch1); |
| Address stubFrameReturnAddr(scratch3, RectifierFrameLayout::Size() + |
| BaselineStubFrameLayout::offsetOfReturnAddress()); |
| masm.loadPtr(stubFrameReturnAddr, scratch2); |
| masm.storePtr(scratch2, lastProfilingCallSite); |
| |
| Address stubFrameSavedFramePtr(scratch3, |
| RectifierFrameLayout::Size() - (2 * sizeof(void*))); |
| masm.loadPtr(stubFrameSavedFramePtr, scratch2); |
| masm.addPtr(Imm32(sizeof(void*)), scratch2); |
| masm.storePtr(scratch2, lastProfilingFrame); |
| masm.ret(); |
| } |
| |
| // JitFrame_IonAccessorIC |
| // |
| // The caller is always an IonJS frame. |
| // |
| // Ion-Descriptor |
| // Ion-ReturnAddr |
| // ... ion frame data ... |- AccFrame-Descriptor.Size |
| // StubCode | |
| // AccFrame-Descriptor |- IonAccessorICFrameLayout::Size() |
| // AccFrame-ReturnAddr | |
| // ... accessor frame data & args ... |- Descriptor.Size |
| // ActualArgc | |
| // CalleeToken |- JitFrameLayout::Size() |
| // Descriptor | |
| // FP -----> ReturnAddr | |
| masm.bind(&handle_IonAccessorIC); |
| { |
| // scratch2 := StackPointer + Descriptor.size + JitFrameLayout::Size() |
| masm.as_addu(scratch2, StackPointer, scratch1); |
| masm.addPtr(Imm32(JitFrameLayout::Size()), scratch2); |
| |
| // scratch3 := AccFrame-Descriptor.Size |
| masm.loadPtr(Address(scratch2, IonAccessorICFrameLayout::offsetOfDescriptor()), scratch3); |
| #ifdef DEBUG |
| // Assert previous frame is an IonJS frame. |
| masm.movePtr(scratch3, scratch1); |
| masm.and32(Imm32((1 << FRAMETYPE_BITS) - 1), scratch1); |
| { |
| Label checkOk; |
| masm.branch32(Assembler::Equal, scratch1, Imm32(JitFrame_IonJS), &checkOk); |
| masm.assumeUnreachable("IonAccessorIC frame must be preceded by IonJS frame"); |
| masm.bind(&checkOk); |
| } |
| #endif |
| masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), scratch3); |
| |
| // lastProfilingCallSite := AccFrame-ReturnAddr |
| masm.loadPtr(Address(scratch2, IonAccessorICFrameLayout::offsetOfReturnAddress()), scratch1); |
| masm.storePtr(scratch1, lastProfilingCallSite); |
| |
| // lastProfilingFrame := AccessorFrame + AccFrame-Descriptor.Size + |
| // IonAccessorICFrameLayout::Size() |
| masm.as_addu(scratch1, scratch2, scratch3); |
| masm.addPtr(Imm32(IonAccessorICFrameLayout::Size()), scratch1); |
| masm.storePtr(scratch1, lastProfilingFrame); |
| masm.ret(); |
| } |
| |
| // |
| // JitFrame_Entry |
| // |
| // If at an entry frame, store null into both fields. |
| // |
| masm.bind(&handle_Entry); |
| { |
| masm.movePtr(ImmPtr(nullptr), scratch1); |
| masm.storePtr(scratch1, lastProfilingCallSite); |
| masm.storePtr(scratch1, lastProfilingFrame); |
| masm.ret(); |
| } |
| |
| Linker linker(masm); |
| AutoFlushICache afc("ProfilerExitFrameTailStub"); |
| JitCode* code = linker.newCode<NoGC>(cx, OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerJitCodeProfile(code, "ProfilerExitFrameStub"); |
| #endif |
| |
| return code; |
| } |
