| /* -*- 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/arm/SharedICHelpers-arm.h" |
| #include "jit/Bailouts.h" |
| #include "jit/JitCompartment.h" |
| #include "jit/JitFrames.h" |
| #include "jit/JitSpewer.h" |
| #include "jit/Linker.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 const FloatRegisterSet NonVolatileFloatRegs = |
| FloatRegisterSet((1ULL << FloatRegisters::d8) | |
| (1ULL << FloatRegisters::d9) | |
| (1ULL << FloatRegisters::d10) | |
| (1ULL << FloatRegisters::d11) | |
| (1ULL << FloatRegisters::d12) | |
| (1ULL << FloatRegisters::d13) | |
| (1ULL << FloatRegisters::d14) | |
| (1ULL << FloatRegisters::d15)); |
| |
| static void |
| GenerateReturn(MacroAssembler& masm, int returnCode, SPSProfiler* prof) |
| { |
| // Restore non-volatile floating point registers. |
| masm.transferMultipleByRuns(NonVolatileFloatRegs, IsLoad, StackPointer, IA); |
| |
| // Get rid of padding word. |
| masm.addPtr(Imm32(sizeof(void*)), sp); |
| |
| // Set up return value |
| masm.ma_mov(Imm32(returnCode), r0); |
| |
| // Pop and return |
| masm.startDataTransferM(IsLoad, sp, IA, WriteBack); |
| masm.transferReg(r4); |
| masm.transferReg(r5); |
| masm.transferReg(r6); |
| masm.transferReg(r7); |
| masm.transferReg(r8); |
| masm.transferReg(r9); |
| masm.transferReg(r10); |
| masm.transferReg(r11); |
| // r12 isn't saved, so it shouldn't be restored. |
| masm.transferReg(pc); |
| masm.finishDataTransfer(); |
| masm.flushBuffer(); |
| } |
| |
| struct EnterJITStack |
| { |
| double d8; |
| double d9; |
| double d10; |
| double d11; |
| double d12; |
| double d13; |
| double d14; |
| double d15; |
| |
| // Padding. |
| void* padding; |
| |
| // Non-volatile registers. |
| void* r4; |
| void* r5; |
| void* r6; |
| void* r7; |
| void* r8; |
| void* r9; |
| void* r10; |
| void* r11; |
| // The abi does not expect r12 (ip) to be preserved |
| void* lr; |
| |
| // Arguments. |
| // code == r0 |
| // argc == r1 |
| // argv == r2 |
| // frame == r3 |
| CalleeToken token; |
| JSObject* scopeChain; |
| size_t numStackValues; |
| Value* vp; |
| }; |
| |
| /* |
| * 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 Address slot_token(sp, offsetof(EnterJITStack, token)); |
| const Address slot_vp(sp, offsetof(EnterJITStack, vp)); |
| |
| MOZ_ASSERT(OsrFrameReg == r3); |
| |
| MacroAssembler masm(cx); |
| Assembler* aasm = &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.startDataTransferM(IsStore, sp, DB, WriteBack); |
| masm.transferReg(r4); // [sp,0] |
| masm.transferReg(r5); // [sp,4] |
| masm.transferReg(r6); // [sp,8] |
| masm.transferReg(r7); // [sp,12] |
| masm.transferReg(r8); // [sp,16] |
| masm.transferReg(r9); // [sp,20] |
| masm.transferReg(r10); // [sp,24] |
| masm.transferReg(r11); // [sp,28] |
| // The abi does not expect r12 (ip) to be preserved |
| masm.transferReg(lr); // [sp,32] |
| // The 5th argument is located at [sp, 36] |
| masm.finishDataTransfer(); |
| |
| // Add padding word. |
| masm.subPtr(Imm32(sizeof(void*)), sp); |
| |
| // Push the float registers. |
| masm.transferMultipleByRuns(NonVolatileFloatRegs, IsStore, sp, DB); |
| |
| // Save stack pointer into r8 |
| masm.movePtr(sp, r8); |
| |
| // Load calleeToken into r9. |
| masm.loadPtr(slot_token, r9); |
| |
| // Save stack pointer. |
| if (type == EnterJitBaseline) |
| masm.movePtr(sp, r11); |
| |
| // Load the number of actual arguments into r10. |
| masm.loadPtr(slot_vp, r10); |
| masm.unboxInt32(Address(r10, 0), r10); |
| |
| { |
| Label noNewTarget; |
| masm.branchTest32(Assembler::Zero, r9, Imm32(CalleeToken_FunctionConstructing), |
| &noNewTarget); |
| |
| masm.add32(Imm32(1), r1); |
| |
| masm.bind(&noNewTarget); |
| } |
| |
| // Guarantee stack alignment of Jit frames. |
| // |
| // This code moves the stack pointer to the location where it should be when |
| // we enter the Jit frame. It moves the stack pointer such that we have |
| // enough space reserved for pushing the arguments, and the JitFrameLayout. |
| // The stack pointer is also aligned on the alignment expected by the Jit |
| // frames. |
| // |
| // At the end the register r4, is a pointer to the stack where the first |
| // argument is expected by the Jit frame. |
| // |
| aasm->as_sub(r4, sp, O2RegImmShift(r1, LSL, 3)); // r4 = sp - argc*8 |
| masm.ma_and(Imm32(~(JitStackAlignment - 1)), r4, r4); |
| // r4 is now the aligned on the bottom of the list of arguments. |
| static_assert(sizeof(JitFrameLayout) % JitStackAlignment == 0, |
| "No need to consider the JitFrameLayout for aligning the stack"); |
| // sp' = ~(JitStackAlignment - 1) & (sp - argc * sizeof(Value)) - sizeof(JitFrameLayout) |
| aasm->as_sub(sp, r4, Imm8(sizeof(JitFrameLayout))); |
| |
| // Get a copy of the number of args to use as a decrement counter, also set |
| // the zero condition code. |
| aasm->as_mov(r5, O2Reg(r1), SetCC); |
| |
| // 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. |
| aasm->as_b(&footer, Assembler::Zero); |
| // Get the top of the loop. |
| masm.bind(&header); |
| aasm->as_sub(r5, r5, Imm8(1), SetCC); |
| // We could be more awesome, and unroll this, using a loadm |
| // (particularly since the offset is effectively 0) but that seems more |
| // error prone, and complex. |
| // BIG FAT WARNING: this loads both r6 and r7. |
| aasm->as_extdtr(IsLoad, 64, true, PostIndex, r6, EDtrAddr(r2, EDtrOffImm(8))); |
| aasm->as_extdtr(IsStore, 64, true, PostIndex, r6, EDtrAddr(r4, EDtrOffImm(8))); |
| aasm->as_b(&header, Assembler::NonZero); |
| masm.bind(&footer); |
| } |
| |
| masm.ma_sub(r8, sp, r8); |
| masm.makeFrameDescriptor(r8, JitFrame_Entry); |
| |
| masm.startDataTransferM(IsStore, sp, IB, NoWriteBack); |
| // [sp] = return address (written later) |
| masm.transferReg(r8); // [sp',4] = descriptor, argc*8+20 |
| masm.transferReg(r9); // [sp',8] = callee token |
| masm.transferReg(r10); // [sp',12] = actual arguments |
| masm.finishDataTransfer(); |
| |
| Label returnLabel; |
| if (type == EnterJitBaseline) { |
| // Handle OSR. |
| AllocatableGeneralRegisterSet regs(GeneralRegisterSet::All()); |
| regs.take(JSReturnOperand); |
| regs.takeUnchecked(OsrFrameReg); |
| regs.take(r11); |
| regs.take(ReturnReg); |
| |
| const Address slot_numStackValues(r11, offsetof(EnterJITStack, numStackValues)); |
| |
| Label notOsr; |
| masm.branchTestPtr(Assembler::Zero, OsrFrameReg, OsrFrameReg, ¬Osr); |
| |
| Register scratch = regs.takeAny(); |
| |
| Register numStackValues = regs.takeAny(); |
| masm.load32(slot_numStackValues, numStackValues); |
| |
| // Write return address. On ARM, CodeLabel is only used for tableswitch, |
| // so we can't use it here to get the return address. Instead, we use pc |
| // + a fixed offset to a jump to returnLabel. The pc register holds pc + |
| // 8, so we add the size of 2 instructions to skip the instructions |
| // emitted by storePtr and jump(&skipJump). |
| { |
| AutoForbidPools afp(&masm, 5); |
| Label skipJump; |
| masm.mov(pc, scratch); |
| masm.addPtr(Imm32(2 * sizeof(uint32_t)), scratch); |
| masm.storePtr(scratch, Address(sp, 0)); |
| masm.jump(&skipJump); |
| masm.jump(&returnLabel); |
| masm.bind(&skipJump); |
| } |
| |
| // Push previous frame pointer. |
| masm.push(r11); |
| |
| // Reserve frame. |
| Register framePtr = r11; |
| masm.subPtr(Imm32(BaselineFrame::Size()), sp); |
| masm.mov(sp, framePtr); |
| |
| #ifdef XP_WIN |
| // Can't push large frames blindly on windows. Touch frame memory |
| // incrementally. |
| masm.ma_lsl(Imm32(3), numStackValues, scratch); |
| masm.subPtr(scratch, framePtr); |
| { |
| masm.ma_sub(sp, Imm32(WINDOWS_BIG_FRAME_TOUCH_INCREMENT), scratch); |
| |
| Label touchFrameLoop; |
| Label touchFrameLoopEnd; |
| masm.bind(&touchFrameLoop); |
| masm.branchPtr(Assembler::Below, scratch, framePtr, &touchFrameLoopEnd); |
| masm.store32(Imm32(0), Address(scratch, 0)); |
| masm.subPtr(Imm32(WINDOWS_BIG_FRAME_TOUCH_INCREMENT), scratch); |
| masm.jump(&touchFrameLoop); |
| masm.bind(&touchFrameLoopEnd); |
| } |
| masm.mov(sp, framePtr); |
| #endif |
| |
| // Reserve space for locals and stack values. |
| masm.ma_lsl(Imm32(3), numStackValues, scratch); |
| masm.ma_sub(sp, scratch, sp); |
| |
| // Enter exit frame. |
| masm.addPtr(Imm32(BaselineFrame::Size() + BaselineFrame::FramePointerOffset), scratch); |
| masm.makeFrameDescriptor(scratch, JitFrame_BaselineJS); |
| masm.push(scratch); |
| masm.push(Imm32(0)); // Fake return address. |
| // No GC things to mark on the stack, push a bare token. |
| masm.enterFakeExitFrame(ExitFrameLayoutBareToken); |
| |
| masm.push(framePtr); // BaselineFrame |
| masm.push(r0); // jitcode |
| |
| masm.setupUnalignedABICall(scratch); |
| masm.passABIArg(r11); // BaselineFrame |
| masm.passABIArg(OsrFrameReg); // InterpreterFrame |
| masm.passABIArg(numStackValues); |
| masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, jit::InitBaselineFrameForOsr)); |
| |
| Register jitcode = regs.takeAny(); |
| masm.pop(jitcode); |
| masm.pop(framePtr); |
| |
| MOZ_ASSERT(jitcode != ReturnReg); |
| |
| Label error; |
| masm.addPtr(Imm32(ExitFrameLayout::SizeWithFooter()), sp); |
| 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_add(framePtr, Imm32(sizeof(void*)), realFramePtr); |
| 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.mov(framePtr, sp); |
| masm.addPtr(Imm32(2 * sizeof(uintptr_t)), sp); |
| masm.moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand); |
| masm.jump(&returnLabel); |
| |
| masm.bind(¬Osr); |
| // Load the scope chain in R1. |
| MOZ_ASSERT(R1.scratchReg() != r0); |
| masm.loadPtr(Address(r11, offsetof(EnterJITStack, scopeChain)), R1.scratchReg()); |
| } |
| |
| // The Data transfer is pushing 4 words, which already account for the |
| // return address space of the Jit frame. We have to undo what the data |
| // transfer did before making the call. |
| masm.addPtr(Imm32(sizeof(uintptr_t)), sp); |
| |
| // The callee 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. |
| masm.callJitNoProfiler(r0); |
| |
| if (type == EnterJitBaseline) { |
| // Baseline OSR will return here. |
| masm.bind(&returnLabel); |
| } |
| |
| // The top of the stack now points to the address of the field following the |
| // return address because the return address is popped for the return, so we |
| // need to remove the size of the return address field. |
| aasm->as_sub(sp, sp, Imm8(4)); |
| |
| // Load off of the stack the size of our local stack. |
| masm.loadPtr(Address(sp, JitFrameLayout::offsetOfDescriptor()), r5); |
| aasm->as_add(sp, sp, lsr(r5, FRAMESIZE_SHIFT)); |
| |
| // Store the returned value into the slot_vp |
| masm.loadPtr(slot_vp, r5); |
| masm.storeValue(JSReturnOperand, Address(r5, 0)); |
| |
| // :TODO: Optimize storeValue with: |
| // We're using a load-double here. In order for that to work, the data needs |
| // to be stored in two consecutive registers, make sure this is the case |
| // MOZ_ASSERT(JSReturnReg_Type.code() == JSReturnReg_Data.code()+1); |
| // aasm->as_extdtr(IsStore, 64, true, Offset, |
| // JSReturnReg_Data, EDtrAddr(r5, EDtrOffImm(0))); |
| |
| // Restore non-volatile registers and return. |
| GenerateReturn(masm, true, &cx->runtime()->spsProfiler); |
| |
| Linker linker(masm); |
| AutoFlushICache afc("EnterJIT"); |
| JitCode* code = linker.newCode<NoGC>(cx, OTHER_CODE); |
| |
| #ifdef JS_ION_PERF |
| writePerfSpewerJitCodeProfile(code, "EnterJIT"); |
| #endif |
| |
| return code; |
| } |
| |
| JitCode* |
| JitRuntime::generateInvalidator(JSContext* cx) |
| { |
| // See large comment in x86's JitRuntime::generateInvalidator. |
| MacroAssembler masm(cx); |
| // At this point, one of two things has happened: |
| // 1) Execution has just returned from C code, which left the stack aligned |
| // 2) Execution has just returned from Ion code, which left the stack unaligned. |
| // The old return address should not matter, but we still want the stack to |
| // be aligned, and there is no good reason to automatically align it with a |
| // call to setupUnalignedABICall. |
| masm.ma_and(Imm32(~7), sp, sp); |
| masm.startDataTransferM(IsStore, sp, DB, WriteBack); |
| // We don't have to push everything, but this is likely easier. |
| // Setting regs_. |
| for (uint32_t i = 0; i < Registers::Total; i++) |
| masm.transferReg(Register::FromCode(i)); |
| masm.finishDataTransfer(); |
| |
| // Since our datastructures for stack inspection are compile-time fixed, |
| // if there are only 16 double registers, then we need to reserve |
| // space on the stack for the missing 16. |
| if (FloatRegisters::ActualTotalPhys() != FloatRegisters::TotalPhys) { |
| int missingRegs = FloatRegisters::TotalPhys - FloatRegisters::ActualTotalPhys(); |
| masm.ma_sub(Imm32(missingRegs * sizeof(double)), sp); |
| } |
| |
| masm.startFloatTransferM(IsStore, sp, DB, WriteBack); |
| for (uint32_t i = 0; i < FloatRegisters::ActualTotalPhys(); i++) |
| masm.transferFloatReg(FloatRegister(i, FloatRegister::Double)); |
| masm.finishFloatTransfer(); |
| |
| masm.ma_mov(sp, r0); |
| const int sizeOfRetval = sizeof(size_t)*2; |
| masm.reserveStack(sizeOfRetval); |
| masm.mov(sp, r1); |
| const int sizeOfBailoutInfo = sizeof(void*)*2; |
| masm.reserveStack(sizeOfBailoutInfo); |
| masm.mov(sp, r2); |
| masm.setupAlignedABICall(); |
| masm.passABIArg(r0); |
| masm.passABIArg(r1); |
| masm.passABIArg(r2); |
| masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, InvalidationBailout)); |
| |
| masm.ma_ldr(Address(sp, 0), r2); |
| masm.ma_ldr(Address(sp, sizeOfBailoutInfo), r1); |
| // Remove the return address, the IonScript, the register state |
| // (InvaliationBailoutStack) and the space that was allocated for the return |
| // value. |
| masm.ma_add(sp, Imm32(sizeof(InvalidationBailoutStack) + sizeOfRetval + sizeOfBailoutInfo), sp); |
| // Remove the space that this frame was using before the bailout (computed |
| // by InvalidationBailout) |
| masm.ma_add(sp, r1, sp); |
| |
| // 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); |
| masm.pushReturnAddress(); |
| |
| // ArgumentsRectifierReg contains the |nargs| pushed onto the current frame. |
| // Including |this|, there are (|nargs| + 1) arguments to copy. |
| MOZ_ASSERT(ArgumentsRectifierReg == r8); |
| |
| // Copy number of actual arguments into r0. |
| masm.ma_ldr(DTRAddr(sp, DtrOffImm(RectifierFrameLayout::offsetOfNumActualArgs())), r0); |
| |
| // Load the number of |undefined|s to push into r6. |
| masm.ma_ldr(DTRAddr(sp, DtrOffImm(RectifierFrameLayout::offsetOfCalleeToken())), r1); |
| masm.ma_and(Imm32(CalleeTokenMask), r1, r6); |
| masm.ma_ldrh(EDtrAddr(r6, EDtrOffImm(JSFunction::offsetOfNargs())), r6); |
| |
| masm.ma_sub(r6, r8, r2); |
| |
| // Get the topmost argument. |
| masm.ma_alu(sp, lsl(r8, 3), r3, OpAdd); // r3 <- r3 + nargs * 8 |
| masm.ma_add(r3, Imm32(sizeof(RectifierFrameLayout)), r3); |
| |
| { |
| Label notConstructing; |
| |
| masm.branchTest32(Assembler::Zero, r1, Imm32(CalleeToken_FunctionConstructing), |
| ¬Constructing); |
| |
| // Add sizeof(Value) to overcome |this| |
| masm.ma_dataTransferN(IsLoad, 64, true, r3, Imm32(8), r4, Offset); |
| masm.ma_dataTransferN(IsStore, 64, true, sp, Imm32(-8), r4, PreIndex); |
| |
| // Include the newly pushed newTarget value in the frame size |
| // calculated below. |
| masm.add32(Imm32(1), r6); |
| |
| masm.bind(¬Constructing); |
| } |
| |
| // Push undefined. |
| masm.moveValue(UndefinedValue(), r5, r4); |
| { |
| Label undefLoopTop; |
| masm.bind(&undefLoopTop); |
| masm.ma_dataTransferN(IsStore, 64, true, sp, Imm32(-8), r4, PreIndex); |
| masm.ma_sub(r2, Imm32(1), r2, SetCC); |
| |
| masm.ma_b(&undefLoopTop, Assembler::NonZero); |
| } |
| |
| // Push arguments, |nargs| + 1 times (to include |this|). |
| { |
| Label copyLoopTop; |
| masm.bind(©LoopTop); |
| masm.ma_dataTransferN(IsLoad, 64, true, r3, Imm32(-8), r4, PostIndex); |
| masm.ma_dataTransferN(IsStore, 64, true, sp, Imm32(-8), r4, PreIndex); |
| |
| masm.ma_sub(r8, Imm32(1), r8, SetCC); |
| masm.ma_b(©LoopTop, Assembler::NotSigned); |
| } |
| |
| // translate the framesize from values into bytes |
| masm.ma_add(r6, Imm32(1), r6); |
| masm.ma_lsl(Imm32(3), r6, r6); |
| |
| // Construct sizeDescriptor. |
| masm.makeFrameDescriptor(r6, JitFrame_Rectifier); |
| |
| // Construct JitFrameLayout. |
| masm.ma_push(r0); // actual arguments. |
| masm.ma_push(r1); // callee token |
| masm.ma_push(r6); // frame descriptor. |
| |
| // Call the target function. |
| // Note that this code assumes the function is JITted. |
| masm.andPtr(Imm32(CalleeTokenMask), r1); |
| masm.ma_ldr(DTRAddr(r1, DtrOffImm(JSFunction::offsetOfNativeOrScript())), r3); |
| masm.loadBaselineOrIonRaw(r3, r3, nullptr); |
| uint32_t returnOffset = masm.callJitNoProfiler(r3); |
| |
| // arg1 |
| // ... |
| // argN |
| // num actual args |
| // callee token |
| // sizeDescriptor <- sp now |
| // return address |
| |
| // Remove the rectifier frame. |
| masm.ma_dtr(IsLoad, sp, Imm32(12), r4, PostIndex); |
| |
| // arg1 |
| // ... |
| // argN <- sp now; r4 <- frame descriptor |
| // num actual args |
| // callee token |
| // sizeDescriptor |
| // return address |
| |
| // Discard pushed arguments. |
| masm.ma_alu(sp, lsr(r4, FRAMESIZE_SHIFT), sp, OpAdd); |
| |
| 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; |
| } |
| |
| static void |
| PushBailoutFrame(MacroAssembler& masm, uint32_t frameClass, Register spArg) |
| { |
| // the stack should look like: |
| // [IonFrame] |
| // bailoutFrame.registersnapshot |
| // bailoutFrame.fpsnapshot |
| // bailoutFrame.snapshotOffset |
| // bailoutFrame.frameSize |
| |
| // STEP 1a: Save our register sets to the stack so Bailout() can read |
| // everything. |
| // sp % 8 == 0 |
| |
| masm.startDataTransferM(IsStore, sp, DB, WriteBack); |
| // We don't have to push everything, but this is likely easier. |
| // Setting regs_. |
| for (uint32_t i = 0; i < Registers::Total; i++) |
| masm.transferReg(Register::FromCode(i)); |
| masm.finishDataTransfer(); |
| |
| // Since our datastructures for stack inspection are compile-time fixed, |
| // if there are only 16 double registers, then we need to reserve |
| // space on the stack for the missing 16. |
| if (FloatRegisters::ActualTotalPhys() != FloatRegisters::TotalPhys) { |
| int missingRegs = FloatRegisters::TotalPhys - FloatRegisters::ActualTotalPhys(); |
| masm.ma_sub(Imm32(missingRegs * sizeof(double)), sp); |
| } |
| masm.startFloatTransferM(IsStore, sp, DB, WriteBack); |
| for (uint32_t i = 0; i < FloatRegisters::ActualTotalPhys(); i++) |
| masm.transferFloatReg(FloatRegister(i, FloatRegister::Double)); |
| masm.finishFloatTransfer(); |
| |
| // STEP 1b: Push both the "return address" of the function call (the address |
| // of the instruction after the call that we used to get here) as |
| // well as the callee token onto the stack. The return address is |
| // currently in r14. We will proceed by loading the callee token |
| // into a sacrificial register <= r14, then pushing both onto the |
| // stack. |
| |
| // Now place the frameClass onto the stack, via a register. |
| masm.ma_mov(Imm32(frameClass), r4); |
| // And onto the stack. Since the stack is full, we need to put this one past |
| // the end of the current stack. Sadly, the ABI says that we need to always |
| // point to the lowest place that has been written. The OS is free to do |
| // whatever it wants below sp. |
| masm.startDataTransferM(IsStore, sp, DB, WriteBack); |
| // Set frameClassId_. |
| masm.transferReg(r4); |
| // Set tableOffset_; higher registers are stored at higher locations on the |
| // stack. |
| masm.transferReg(lr); |
| masm.finishDataTransfer(); |
| |
| masm.ma_mov(sp, spArg); |
| } |
| |
| static void |
| GenerateBailoutThunk(JSContext* cx, MacroAssembler& masm, uint32_t frameClass) |
| { |
| PushBailoutFrame(masm, frameClass, r0); |
| |
| // SP % 8 == 4 |
| // STEP 1c: Call the bailout function, giving a pointer to the |
| // structure we just blitted onto the stack. |
| const int sizeOfBailoutInfo = sizeof(void*)*2; |
| masm.reserveStack(sizeOfBailoutInfo); |
| masm.mov(sp, r1); |
| masm.setupAlignedABICall(); |
| |
| // Decrement sp by another 4, so we keep alignment. Not Anymore! Pushing |
| // both the snapshotoffset as well as the: masm.as_sub(sp, sp, Imm8(4)); |
| |
| // Set the old (4-byte aligned) value of the sp as the first argument. |
| masm.passABIArg(r0); |
| masm.passABIArg(r1); |
| |
| // Sp % 8 == 0 |
| masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, Bailout)); |
| masm.ma_ldr(Address(sp, 0), r2); |
| masm.ma_add(sp, Imm32(sizeOfBailoutInfo), sp); |
| // Common size of a bailout frame. |
| uint32_t bailoutFrameSize = 0 |
| + sizeof(void*) // frameClass |
| + sizeof(RegisterDump); |
| |
| if (frameClass == NO_FRAME_SIZE_CLASS_ID) { |
| // Make sure the bailout frame size fits into the offset for a load. |
| masm.as_dtr(IsLoad, 32, Offset, |
| r4, DTRAddr(sp, DtrOffImm(4))); |
| // Used to be: offsetof(BailoutStack, frameSize_) |
| // This structure is no longer available to us :( |
| // We add 12 to the bailoutFrameSize because: |
| // sizeof(uint32_t) for the tableOffset that was pushed onto the stack |
| // sizeof(uintptr_t) for the snapshotOffset; |
| // alignment to round the uintptr_t up to a multiple of 8 bytes. |
| masm.ma_add(sp, Imm32(bailoutFrameSize+12), sp); |
| masm.as_add(sp, sp, O2Reg(r4)); |
| } else { |
| uint32_t frameSize = FrameSizeClass::FromClass(frameClass).frameSize(); |
| masm.ma_add(Imm32(// The frame that was added when we entered the most |
| // recent function. |
| frameSize |
| // The size of the "return address" that was dumped on |
| // the stack. |
| + sizeof(void*) |
| // Everything else that was pushed on the stack. |
| + bailoutFrameSize) |
| , sp); |
| } |
| |
| // Jump to shared bailout tail. The BailoutInfo pointer has to be in r2. |
| JitCode* bailoutTail = cx->runtime()->jitRuntime()->getBailoutTail(); |
| masm.branch(bailoutTail); |
| } |
| |
| JitCode* |
| JitRuntime::generateBailoutTable(JSContext* cx, uint32_t frameClass) |
| { |
| MacroAssembler masm(cx); |
| |
| { |
| // Emit the table without any pools being inserted. |
| Label bailout; |
| AutoForbidPools afp(&masm, BAILOUT_TABLE_SIZE); |
| for (size_t i = 0; i < BAILOUT_TABLE_SIZE; i++) |
| masm.ma_bl(&bailout); |
| 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(); |
| |
| // Generate a separated code for the wrapper. |
| MacroAssembler masm(cx); |
| AllocatableGeneralRegisterSet regs(Register::Codes::WrapperMask); |
| |
| // Wrapper register set is a superset of Volatile register set. |
| JS_STATIC_ASSERT((Register::Codes::VolatileMask & ~Register::Codes::WrapperMask) == 0); |
| |
| // The context is the first argument; r0 is the first argument register. |
| Register cxreg = r0; |
| regs.take(cxreg); |
| |
| // Stack is: |
| // ... frame ... |
| // +8 [args] + argPadding |
| // +0 ExitFrame |
| // |
| // We're aligned to an exit frame, so link it up. |
| // If it isn't a tail call, then the return address needs to be saved |
| if (f.expectTailCall == NonTailCall) |
| masm.pushReturnAddress(); |
| |
| masm.enterExitFrame(&f); |
| masm.loadJSContext(cxreg); |
| |
| // Save the base of the argument set stored on the stack. |
| Register argsBase = InvalidReg; |
| if (f.explicitArgs) { |
| argsBase = r5; |
| regs.take(argsBase); |
| masm.ma_add(sp, Imm32(ExitFrameLayout::SizeWithFooter()), argsBase); |
| } |
| |
| // Reserve space for the outparameter. |
| Register outReg = InvalidReg; |
| switch (f.outParam) { |
| case Type_Value: |
| outReg = r4; |
| regs.take(outReg); |
| masm.reserveStack(sizeof(Value)); |
| masm.ma_mov(sp, outReg); |
| break; |
| |
| case Type_Handle: |
| outReg = r4; |
| regs.take(outReg); |
| masm.PushEmptyRooted(f.outParamRootType); |
| masm.ma_mov(sp, outReg); |
| break; |
| |
| case Type_Int32: |
| case Type_Pointer: |
| case Type_Bool: |
| outReg = r4; |
| regs.take(outReg); |
| masm.reserveStack(sizeof(int32_t)); |
| masm.ma_mov(sp, outReg); |
| break; |
| |
| case Type_Double: |
| outReg = r4; |
| regs.take(outReg); |
| masm.reserveStack(sizeof(double)); |
| masm.ma_mov(sp, outReg); |
| break; |
| |
| default: |
| MOZ_ASSERT(f.outParam == Type_Void); |
| break; |
| } |
| |
| masm.setupUnalignedABICall(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(void*); |
| 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(void*); |
| break; |
| case VMFunction::DoubleByRef: |
| masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE_ADDRESS), MoveOp::GENERAL); |
| argDisp += 2 * sizeof(void*); |
| 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, r0, r0, masm.failureLabel()); |
| break; |
| case Type_Bool: |
| masm.branchIfFalseBool(r0, masm.failureLabel()); |
| break; |
| default: |
| MOZ_CRASH("unknown failure kind"); |
| } |
| |
| // Load the outparam and free any allocated stack. |
| switch (f.outParam) { |
| case Type_Handle: |
| masm.popRooted(f.outParamRootType, ReturnReg, JSReturnOperand); |
| break; |
| |
| case Type_Value: |
| masm.loadValue(Address(sp, 0), JSReturnOperand); |
| masm.freeStack(sizeof(Value)); |
| break; |
| |
| case Type_Int32: |
| case Type_Pointer: |
| masm.load32(Address(sp, 0), ReturnReg); |
| masm.freeStack(sizeof(int32_t)); |
| break; |
| |
| case Type_Bool: |
| masm.load8ZeroExtend(Address(sp, 0), ReturnReg); |
| masm.freeStack(sizeof(int32_t)); |
| break; |
| |
| case Type_Double: |
| if (cx->runtime()->jitSupportsFloatingPoint) |
| masm.loadDouble(Address(sp, 0), ReturnDoubleReg); |
| 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.leaveExitFrame(); |
| masm.retn(Imm32(sizeof(ExitFrameLayout) + |
| f.explicitStackSlots() * sizeof(void*) + |
| 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::VolatileDoubleMask)); |
| } else { |
| save.set() = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), |
| FloatRegisterSet()); |
| } |
| save.add(lr); |
| masm.PushRegsInMask(save); |
| |
| MOZ_ASSERT(PreBarrierReg == r1); |
| masm.movePtr(ImmPtr(cx->runtime()), r0); |
| |
| masm.setupUnalignedABICall(r2); |
| masm.passABIArg(r0); |
| masm.passABIArg(r1); |
| masm.callWithABI(IonMarkFunction(type)); |
| save.take(AnyRegister(lr)); |
| save.add(pc); |
| masm.PopRegsInMask(save); |
| |
| 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; |
| |
| Register scratch1 = r0; |
| Register scratch2 = r1; |
| |
| // Load BaselineFrame pointer in scratch1. |
| masm.mov(r11, 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.push(lr); |
| masm.push(scratch1); |
| 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); |
| masm.mov(lr, pc); |
| |
| masm.bind(&forcedReturn); |
| masm.loadValue(Address(r11, BaselineFrame::reverseOffsetOfReturnValue()), |
| JSReturnOperand); |
| masm.mov(r11, sp); |
| masm.pop(r11); |
| |
| // 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(r1, r2); |
| |
| 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 = r5; |
| Register scratch2 = r6; |
| Register scratch3 = r7; |
| Register scratch4 = r8; |
| |
| // |
| // 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(Imm32((1 << FRAMETYPE_BITS) - 1), scratch1, scratch2); |
| 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.ma_add(StackPointer, scratch1, scratch2); |
| masm.ma_add(scratch2, Imm32(JitFrameLayout::Size()), scratch2); |
| 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.ma_add(StackPointer, scratch1, scratch3); |
| 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.ma_add(StackPointer, scratch1, scratch2); |
| masm.add32(Imm32(JitFrameLayout::Size()), scratch2); |
| masm.loadPtr(Address(scratch2, RectifierFrameLayout::offsetOfDescriptor()), scratch3); |
| masm.ma_lsr(Imm32(FRAMESIZE_SHIFT), scratch3, scratch1); |
| 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.ma_add(scratch2, scratch1, scratch3); |
| 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.ma_add(scratch2, scratch1, scratch3); |
| 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.ma_add(StackPointer, scratch1, scratch2); |
| 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.ma_add(scratch2, scratch3, scratch1); |
| 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; |
| } |
