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Diffstat (limited to 'js/src/jit/mips32/Trampoline-mips32.cpp')
| -rw-r--r-- | js/src/jit/mips32/Trampoline-mips32.cpp | 1418 |
1 files changed, 1418 insertions, 0 deletions
diff --git a/js/src/jit/mips32/Trampoline-mips32.cpp b/js/src/jit/mips32/Trampoline-mips32.cpp new file mode 100644 index 000000000..d422ed757 --- /dev/null +++ b/js/src/jit/mips32/Trampoline-mips32.cpp @@ -0,0 +1,1418 @@ +/* -*- 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/mips-shared/SharedICHelpers-mips-shared.h" +#include "jit/mips32/Bailouts-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, JitFrameLayout::Size()); + 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, ExitFrameLayout::Size()); + + // 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); + masm.pushReturnAddress(); + + // 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, JitFrameLayout::Size()); + + // 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); + + // If it isn't a tail call, then the return address needs to be saved + if (f.expectTailCall == NonTailCall) + masm.pushReturnAddress(); + + // 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); + + if (!generateTLEnterVM(cx, masm, f)) + return nullptr; + + 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); + + if (!generateTLExitVM(cx, masm, f)) + return nullptr; + + // 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()); + } + save.add(ra); + 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)); + + save.take(AnyRegister(ra)); + 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, "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; +} |