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Diffstat (limited to 'js/src/jit/mips64/Trampoline-mips64.cpp')
| -rw-r--r-- | js/src/jit/mips64/Trampoline-mips64.cpp | 1297 |
1 files changed, 1297 insertions, 0 deletions
diff --git a/js/src/jit/mips64/Trampoline-mips64.cpp b/js/src/jit/mips64/Trampoline-mips64.cpp new file mode 100644 index 0000000000..482798d053 --- /dev/null +++ b/js/src/jit/mips64/Trampoline-mips64.cpp @@ -0,0 +1,1297 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * 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 "jit/Bailouts.h" +#include "jit/BaselineFrame.h" +#include "jit/CalleeToken.h" +#include "jit/JitFrames.h" +#include "jit/JitRuntime.h" +#include "jit/JitSpewer.h" +#include "jit/mips-shared/SharedICHelpers-mips-shared.h" +#include "jit/mips64/Bailouts-mips64.h" +#ifdef JS_ION_PERF +# include "jit/PerfSpewer.h" +#endif +#include "jit/VMFunctions.h" +#include "vm/JitActivation.h" // js::jit::JitActivation +#include "vm/JSContext.h" +#include "vm/Realm.h" + +#include "jit/MacroAssembler-inl.h" + +using namespace js; +using namespace js::jit; + +// All registers to save and restore. This includes the stack pointer, since we +// use the ability to reference register values on the stack by index. +static const LiveRegisterSet AllRegs = + LiveRegisterSet(GeneralRegisterSet(Registers::AllMask), + FloatRegisterSet(FloatRegisters::AllMask)); + +static_assert(sizeof(uintptr_t) == sizeof(uint64_t), "Not 32-bit clean."); + +struct EnterJITRegs { + double f31; + double f30; + double f29; + double f28; + double f27; + double f26; + double f25; + double f24; + + uintptr_t align; + + // non-volatile registers. + uint64_t ra; + uint64_t fp; + uint64_t s7; + uint64_t s6; + uint64_t s5; + uint64_t s4; + uint64_t s3; + uint64_t s2; + uint64_t s1; + uint64_t s0; + // Save reg_vp(a7) on stack, use it after call jit code. + uint64_t a7; +}; + +static void GenerateReturn(MacroAssembler& masm, int returnCode) { + MOZ_ASSERT(masm.framePushed() == sizeof(EnterJITRegs)); + + if (isLoongson()) { + // Restore non-volatile registers + masm.as_ld(s0, StackPointer, offsetof(EnterJITRegs, s0)); + masm.as_gslq(s1, s2, StackPointer, offsetof(EnterJITRegs, s2)); + masm.as_gslq(s3, s4, StackPointer, offsetof(EnterJITRegs, s4)); + masm.as_gslq(s5, s6, StackPointer, offsetof(EnterJITRegs, s6)); + masm.as_gslq(s7, fp, StackPointer, offsetof(EnterJITRegs, fp)); + masm.as_ld(ra, StackPointer, offsetof(EnterJITRegs, ra)); + + // Restore non-volatile floating point registers + masm.as_gslq(f24, f25, StackPointer, offsetof(EnterJITRegs, f25)); + masm.as_gslq(f26, f27, StackPointer, offsetof(EnterJITRegs, f27)); + masm.as_gslq(f28, f29, StackPointer, offsetof(EnterJITRegs, f29)); + masm.as_gslq(f30, f31, StackPointer, offsetof(EnterJITRegs, f31)); + } else { + // Restore non-volatile registers + masm.as_ld(s0, StackPointer, offsetof(EnterJITRegs, s0)); + masm.as_ld(s1, StackPointer, offsetof(EnterJITRegs, s1)); + masm.as_ld(s2, StackPointer, offsetof(EnterJITRegs, s2)); + masm.as_ld(s3, StackPointer, offsetof(EnterJITRegs, s3)); + masm.as_ld(s4, StackPointer, offsetof(EnterJITRegs, s4)); + masm.as_ld(s5, StackPointer, offsetof(EnterJITRegs, s5)); + masm.as_ld(s6, StackPointer, offsetof(EnterJITRegs, s6)); + masm.as_ld(s7, StackPointer, offsetof(EnterJITRegs, s7)); + masm.as_ld(fp, StackPointer, offsetof(EnterJITRegs, fp)); + masm.as_ld(ra, StackPointer, offsetof(EnterJITRegs, ra)); + + // Restore non-volatile floating point registers + masm.as_ldc1(f24, StackPointer, offsetof(EnterJITRegs, f24)); + masm.as_ldc1(f25, StackPointer, offsetof(EnterJITRegs, f25)); + masm.as_ldc1(f26, StackPointer, offsetof(EnterJITRegs, f26)); + masm.as_ldc1(f27, StackPointer, offsetof(EnterJITRegs, f27)); + masm.as_ldc1(f28, StackPointer, offsetof(EnterJITRegs, f28)); + masm.as_ldc1(f29, StackPointer, offsetof(EnterJITRegs, f29)); + masm.as_ldc1(f30, StackPointer, offsetof(EnterJITRegs, f30)); + masm.as_ldc1(f31, StackPointer, offsetof(EnterJITRegs, f31)); + } + + masm.freeStack(sizeof(EnterJITRegs)); + + masm.branch(ra); +} + +static void GeneratePrologue(MacroAssembler& masm) { + masm.reserveStack(sizeof(EnterJITRegs)); + + if (isLoongson()) { + masm.as_gssq(a7, s0, StackPointer, offsetof(EnterJITRegs, s0)); + masm.as_gssq(s1, s2, StackPointer, offsetof(EnterJITRegs, s2)); + masm.as_gssq(s3, s4, StackPointer, offsetof(EnterJITRegs, s4)); + masm.as_gssq(s5, s6, StackPointer, offsetof(EnterJITRegs, s6)); + masm.as_gssq(s7, fp, StackPointer, offsetof(EnterJITRegs, fp)); + masm.as_sd(ra, StackPointer, offsetof(EnterJITRegs, ra)); + + masm.as_gssq(f24, f25, StackPointer, offsetof(EnterJITRegs, f25)); + masm.as_gssq(f26, f27, StackPointer, offsetof(EnterJITRegs, f27)); + masm.as_gssq(f28, f29, StackPointer, offsetof(EnterJITRegs, f29)); + masm.as_gssq(f30, f31, StackPointer, offsetof(EnterJITRegs, f31)); + return; + } + + masm.as_sd(s0, StackPointer, offsetof(EnterJITRegs, s0)); + masm.as_sd(s1, StackPointer, offsetof(EnterJITRegs, s1)); + masm.as_sd(s2, StackPointer, offsetof(EnterJITRegs, s2)); + masm.as_sd(s3, StackPointer, offsetof(EnterJITRegs, s3)); + masm.as_sd(s4, StackPointer, offsetof(EnterJITRegs, s4)); + masm.as_sd(s5, StackPointer, offsetof(EnterJITRegs, s5)); + masm.as_sd(s6, StackPointer, offsetof(EnterJITRegs, s6)); + masm.as_sd(s7, StackPointer, offsetof(EnterJITRegs, s7)); + masm.as_sd(fp, StackPointer, offsetof(EnterJITRegs, fp)); + masm.as_sd(ra, StackPointer, offsetof(EnterJITRegs, ra)); + masm.as_sd(a7, StackPointer, offsetof(EnterJITRegs, a7)); + + masm.as_sdc1(f24, StackPointer, offsetof(EnterJITRegs, f24)); + masm.as_sdc1(f25, StackPointer, offsetof(EnterJITRegs, f25)); + masm.as_sdc1(f26, StackPointer, offsetof(EnterJITRegs, f26)); + masm.as_sdc1(f27, StackPointer, offsetof(EnterJITRegs, f27)); + masm.as_sdc1(f28, StackPointer, offsetof(EnterJITRegs, f28)); + masm.as_sdc1(f29, StackPointer, offsetof(EnterJITRegs, f29)); + masm.as_sdc1(f30, StackPointer, offsetof(EnterJITRegs, f30)); + masm.as_sdc1(f31, StackPointer, offsetof(EnterJITRegs, f31)); +} + +// Generates a trampoline for calling Jit compiled code from a C++ function. +// The trampoline use the EnterJitCode signature, with the standard x64 fastcall +// calling convention. +void JitRuntime::generateEnterJIT(JSContext* cx, MacroAssembler& masm) { + enterJITOffset_ = startTrampolineCode(masm); + + const Register reg_code = IntArgReg0; + const Register reg_argc = IntArgReg1; + const Register reg_argv = IntArgReg2; + const mozilla::DebugOnly<Register> reg_frame = IntArgReg3; + const Register reg_token = IntArgReg4; + const Register reg_chain = IntArgReg5; + const Register reg_values = IntArgReg6; + const Register reg_vp = IntArgReg7; + + MOZ_ASSERT(OsrFrameReg == reg_frame); + + GeneratePrologue(masm); + + // Save stack pointer into s4 + masm.movePtr(StackPointer, s4); + + // Save stack pointer as baseline frame. + masm.movePtr(StackPointer, BaselineFrameReg); + + // Load the number of actual arguments into s3. + masm.unboxInt32(Address(reg_vp, 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, reg_token, + Imm32(CalleeToken_FunctionConstructing), &noNewTarget); + + masm.add32(Imm32(1), reg_argc); + + masm.bind(&noNewTarget); + } + + // Make stack algined + masm.ma_and(s0, reg_argc, Imm32(1)); + masm.ma_dsubu(s1, StackPointer, Imm32(sizeof(Value))); +#ifdef MIPSR6 + masm.as_selnez(s1, s1, s0); + masm.as_seleqz(StackPointer, StackPointer, s0); + masm.as_or(StackPointer, StackPointer, s1); +#else + masm.as_movn(StackPointer, s1, s0); +#endif + + masm.as_dsll(s0, reg_argc, 3); // Value* argv + masm.addPtr(reg_argv, s0); // s0 = &argv[argc] + + // 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(sizeof(Value)), s0); + masm.subPtr(Imm32(sizeof(Value)), StackPointer); + + ValueOperand value = ValueOperand(s6); + 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(reg_token, Address(StackPointer, 0)); // callee token + + masm.subPtr(StackPointer, s4); + masm.makeFrameDescriptor(s4, FrameType::CppToJSJit, JitFrameLayout::Size()); + masm.push(s4); // descriptor + + CodeLabel returnLabel; + CodeLabel oomReturnLabel; + { + // Handle Interpreter -> Baseline OSR. + AllocatableGeneralRegisterSet regs(GeneralRegisterSet::All()); + regs.take(OsrFrameReg); + regs.take(BaselineFrameReg); + regs.take(reg_code); + regs.take(ReturnReg); + regs.take(JSReturnOperand); + + Label notOsr; + masm.ma_b(OsrFrameReg, OsrFrameReg, ¬Osr, Assembler::Zero, ShortJump); + + Register numStackValues = reg_values; + regs.take(numStackValues); + Register scratch = regs.takeAny(); + + // Push return address. + masm.subPtr(Imm32(sizeof(uintptr_t)), StackPointer); + masm.ma_li(scratch, &returnLabel); + 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_dsll(scratch, numStackValues, Imm32(3)); + masm.subPtr(scratch, StackPointer); + + // Enter exit frame. + masm.addPtr( + Imm32(BaselineFrame::Size() + BaselineFrame::FramePointerOffset), + scratch); + masm.makeFrameDescriptor(scratch, FrameType::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.loadJSContext(scratch); + masm.enterFakeExitFrame(scratch, scratch, ExitFrameType::Bare); + + masm.reserveStack(2 * sizeof(uintptr_t)); + masm.storePtr(framePtr, + Address(StackPointer, sizeof(uintptr_t))); // BaselineFrame + masm.storePtr(reg_code, Address(StackPointer, 0)); // jitcode + + using Fn = bool (*)(BaselineFrame * frame, InterpreterFrame * interpFrame, + uint32_t numStackValues); + masm.setupUnalignedABICall(scratch); + masm.passABIArg(BaselineFrameReg); // BaselineFrame + masm.passABIArg(OsrFrameReg); // InterpreterFrame + masm.passABIArg(numStackValues); + masm.callWithABI<Fn, jit::InitBaselineFrameForOsr>( + MoveOp::GENERAL, CheckUnsafeCallWithABI::DontCheckHasExitFrame); + + regs.add(OsrFrameReg); + 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()->geckoProfiler().addressOfEnabled()); + masm.branch32(Assembler::Equal, addressOfEnabled, Imm32(0), + &skipProfilingInstrumentation); + masm.ma_daddu(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); + masm.jump(scratch); + + masm.bind(¬Osr); + // Load the scope chain in R1. + MOZ_ASSERT(R1.scratchReg() != reg_code); + masm.ma_move(R1.scratchReg(), reg_chain); + } + + // 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); + + { + // Interpreter -> Baseline OSR will return here. + masm.bind(&returnLabel); + masm.addCodeLabel(returnLabel); + masm.bind(&oomReturnLabel); + 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 vp + masm.as_ld(reg_vp, StackPointer, offsetof(EnterJITRegs, a7)); + masm.storeValue(JSReturnOperand, Address(reg_vp, 0)); + + // Restore non-volatile registers and return. + GenerateReturn(masm, ShortJump); +} + +void JitRuntime::generateInvalidator(MacroAssembler& masm, Label* bailoutTail) { + invalidatorOffset_ = startTrampolineCode(masm); + + // Stack has to be alligned here. If not, we will have to fix it. + masm.checkStackAlignment(); + + // Push registers such that we can access them from [base + code]. + masm.PushRegsInMask(AllRegs); + + // 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_daddu(a1, StackPointer, Imm32(sizeof(uintptr_t))); + // Pass pointer to BailoutInfo + masm.movePtr(StackPointer, a2); + + using Fn = bool (*)(InvalidationBailoutStack * sp, size_t * frameSizeOut, + BaselineBailoutInfo * *info); + masm.setupAlignedABICall(); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.passABIArg(a2); + masm.callWithABI<Fn, InvalidationBailout>( + MoveOp::GENERAL, CheckUnsafeCallWithABI::DontCheckOther); + + 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. + masm.jump(bailoutTail); +} + +void JitRuntime::generateArgumentsRectifier(MacroAssembler& masm, + ArgumentsRectifierKind kind) { + // Do not erase the frame pointer in this function. + + switch (kind) { + case ArgumentsRectifierKind::Normal: + argumentsRectifierOffset_ = startTrampolineCode(masm); + break; + case ArgumentsRectifierKind::TrialInlining: + trialInliningArgumentsRectifierOffset_ = startTrampolineCode(masm); + break; + } + masm.pushReturnAddress(); + + // Caller: + // [arg2] [arg1] [this] [[argc] [callee] [descr] [raddr]] <- sp + + // Add |this|, in the counter of known arguments. + masm.loadPtr( + Address(StackPointer, RectifierFrameLayout::offsetOfNumActualArgs()), s3); + masm.addPtr(Imm32(1), s3); + + Register numActArgsReg = a6; + Register calleeTokenReg = a7; + Register numArgsReg = a5; + + // Load |nformals| into numArgsReg. + masm.loadPtr( + Address(StackPointer, RectifierFrameLayout::offsetOfCalleeToken()), + calleeTokenReg); + masm.mov(calleeTokenReg, numArgsReg); + masm.andPtr(Imm32(uint32_t(CalleeTokenMask)), numArgsReg); + masm.load16ZeroExtend(Address(numArgsReg, JSFunction::offsetOfNargs()), + numArgsReg); + + // Stash another copy in t3, since we are going to do destructive operations + // on numArgsReg + masm.mov(numArgsReg, t3); + + static_assert( + CalleeToken_FunctionConstructing == 1, + "Ensure that we can use the constructing bit to count the value"); + masm.mov(calleeTokenReg, t2); + masm.ma_and(t2, Imm32(uint32_t(CalleeToken_FunctionConstructing))); + + // Including |this|, and |new.target|, there are (|nformals| + 1 + + // isConstructing) arguments to push to the stack. Then we push a + // JitFrameLayout. We compute the padding expressed in the number of extra + // |undefined| values to push on the stack. + static_assert( + sizeof(JitFrameLayout) % JitStackAlignment == 0, + "No need to consider the JitFrameLayout for aligning the stack"); + static_assert( + JitStackAlignment % sizeof(Value) == 0, + "Ensure that we can pad the stack by pushing extra UndefinedValue"); + + MOZ_ASSERT(mozilla::IsPowerOfTwo(JitStackValueAlignment)); + masm.add32( + Imm32(JitStackValueAlignment - 1 /* for padding */ + 1 /* for |this| */), + numArgsReg); + masm.add32(t2, numArgsReg); + masm.and32(Imm32(~(JitStackValueAlignment - 1)), numArgsReg); + + // Load the number of |undefined|s to push into t1. + masm.as_dsubu(t1, numArgsReg, s3); + + // Caller: + // [arg2] [arg1] [this] [ [argc] [callee] [descr] [raddr] ] <- sp <- t2 + // '------ s3 -------' + // + // Rectifier frame: + // [undef] [undef] [undef] [arg2] [arg1] [this] [ [argc] [callee] + // [descr] [raddr] ] + // '-------- t1 ---------' '------- s3 -------' + + // Copy number of actual arguments into numActArgsReg + masm.loadPtr( + Address(StackPointer, RectifierFrameLayout::offsetOfNumActualArgs()), + numActArgsReg); + + masm.moveValue(UndefinedValue(), ValueOperand(t0)); + + masm.movePtr(StackPointer, t2); // Save %sp. + + // Push undefined. (including the padding) + { + Label undefLoopTop; + + masm.bind(&undefLoopTop); + masm.sub32(Imm32(1), t1); + masm.subPtr(Imm32(sizeof(Value)), StackPointer); + masm.storeValue(ValueOperand(t0), Address(StackPointer, 0)); + + masm.ma_b(t1, t1, &undefLoopTop, Assembler::NonZero, ShortJump); + } + + // Get the topmost argument. + static_assert(sizeof(Value) == 8, "TimesEight is used to skip arguments"); + + // | - sizeof(Value)| is used to put rcx such that we can read the last + // argument, and not the value which is after. + masm.ma_dsll(t0, s3, Imm32(3)); // t0 <- nargs * 8 + masm.as_daddu(t1, t2, t0); // t1 <- t2(saved sp) + nargs * 8 + masm.addPtr(Imm32(sizeof(RectifierFrameLayout) - sizeof(Value)), t1); + + // Copy & Push arguments, |nargs| + 1 times (to include |this|). + { + Label copyLoopTop; + + masm.bind(©LoopTop); + masm.sub32(Imm32(1), s3); + masm.subPtr(Imm32(sizeof(Value)), StackPointer); + masm.loadValue(Address(t1, 0), ValueOperand(t0)); + masm.storeValue(ValueOperand(t0), Address(StackPointer, 0)); + masm.subPtr(Imm32(sizeof(Value)), t1); + + masm.ma_b(s3, s3, ©LoopTop, Assembler::NonZero, ShortJump); + } + + // if constructing, copy newTarget + { + Label notConstructing; + + masm.branchTest32(Assembler::Zero, calleeTokenReg, + Imm32(CalleeToken_FunctionConstructing), + ¬Constructing); + + // thisFrame[numFormals] = prevFrame[argc] + ValueOperand newTarget(t0); + + // +1 for |this|. We want vp[argc], so don't subtract 1 + BaseIndex newTargetSrc(t2, numActArgsReg, TimesEight, + sizeof(RectifierFrameLayout) + sizeof(Value)); + masm.loadValue(newTargetSrc, newTarget); + + // Again, 1 for |this| + BaseIndex newTargetDest(StackPointer, t3, TimesEight, sizeof(Value)); + masm.storeValue(newTarget, newTargetDest); + + masm.bind(¬Constructing); + } + + // Caller: + // [arg2] [arg1] [this] [ [argc] [callee] [descr] [raddr] ] <- t2 + // + // + // Rectifier frame: + // [undef] [undef] [undef] [arg2] [arg1] [this] <- sp [ [argc] [callee] + // [descr] [raddr] ] + + // Construct sizeDescriptor. + masm.subPtr(StackPointer, t2); + masm.makeFrameDescriptor(t2, FrameType::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(t2, Address(StackPointer, 0)); + + // Call the target function. + masm.andPtr(Imm32(uint32_t(CalleeTokenMask)), calleeTokenReg); + switch (kind) { + case ArgumentsRectifierKind::Normal: + masm.loadJitCodeRaw(calleeTokenReg, t1); + argumentsRectifierReturnOffset_ = masm.callJitNoProfiler(t1); + break; + case ArgumentsRectifierKind::TrialInlining: + Label noBaselineScript, done; + masm.loadBaselineJitCodeRaw(calleeTokenReg, t1, &noBaselineScript); + masm.callJitNoProfiler(t1); + masm.jump(&done); + + // See BaselineCacheIRCompiler::emitCallInlinedFunction. + masm.bind(&noBaselineScript); + masm.loadJitCodeRaw(calleeTokenReg, t1); + masm.callJitNoProfiler(t1); + masm.bind(&done); + break; + } + + // Remove the rectifier frame. + // t2 <- descriptor with FrameType. + masm.loadPtr(Address(StackPointer, 0), t2); + masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), t2); // t2 <- descriptor. + + // Discard descriptor, calleeToken and number of actual arguments. + masm.addPtr(Imm32(3 * sizeof(uintptr_t)), StackPointer); + + // Discard pushed arguments. + masm.addPtr(t2, StackPointer); + + masm.ret(); +} + +/* - When bailout is done via out of line code (lazy bailout). + * Frame size is stored in $ra (look at + * CodeGeneratorMIPS64::generateOutOfLineCode()) and thunk code should save it + * on stack. Other difference is that members snapshotOffset_ and padding_ are + * pushed to the stack by CodeGeneratorMIPS64::visitOutOfLineBailout(). Field + * frameClassId_ is forced to be NO_FRAME_SIZE_CLASS_ID + * (See: JitRuntime::generateBailoutHandler). + */ +static void PushBailoutFrame(MacroAssembler& masm, Register spArg) { + // Push the frameSize_ stored in ra + // See: CodeGeneratorMIPS64::generateOutOfLineCode() + masm.push(ra); + + // Push registers such that we can access them from [base + code]. + masm.PushRegsInMask(AllRegs); + + // Put pointer to BailoutStack as first argument to the Bailout() + masm.movePtr(StackPointer, spArg); +} + +static void GenerateBailoutThunk(MacroAssembler& masm, uint32_t frameClass, + Label* bailoutTail) { + PushBailoutFrame(masm, a0); + + // Put pointer to BailoutInfo + static const uint32_t sizeOfBailoutInfo = sizeof(uintptr_t) * 2; + masm.subPtr(Imm32(sizeOfBailoutInfo), StackPointer); + masm.movePtr(StackPointer, a1); + + using Fn = bool (*)(BailoutStack * sp, BaselineBailoutInfo * *info); + masm.setupAlignedABICall(); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.callWithABI<Fn, Bailout>(MoveOp::GENERAL, + CheckUnsafeCallWithABI::DontCheckOther); + + // Get BailoutInfo pointer + masm.loadPtr(Address(StackPointer, 0), a2); + + // Stack is: + // [frame] + // snapshotOffset + // frameSize + // [bailoutFrame] + // [bailoutInfo] + // + // Remove both the bailout frame and the topmost Ion frame's stack. + // Load frameSize from stack + masm.loadPtr(Address(StackPointer, + sizeOfBailoutInfo + BailoutStack::offsetOfFrameSize()), + a1); + // Remove complete BailoutStack class and data after it + masm.addPtr(Imm32(sizeof(BailoutStack) + sizeOfBailoutInfo), StackPointer); + // Remove frame size srom stack + masm.addPtr(a1, StackPointer); + + // Jump to shared bailout tail. The BailoutInfo pointer has to be in a2. + masm.jump(bailoutTail); +} + +JitRuntime::BailoutTable JitRuntime::generateBailoutTable(MacroAssembler& masm, + Label* bailoutTail, + uint32_t frameClass) { + MOZ_CRASH("MIPS64 does not use bailout tables"); +} + +void JitRuntime::generateBailoutHandler(MacroAssembler& masm, + Label* bailoutTail) { + bailoutHandlerOffset_ = startTrampolineCode(masm); + + GenerateBailoutThunk(masm, NO_FRAME_SIZE_CLASS_ID, bailoutTail); +} + +bool JitRuntime::generateVMWrapper(JSContext* cx, MacroAssembler& masm, + const VMFunctionData& f, DynFn nativeFun, + uint32_t* wrapperOffset) { + *wrapperOffset = startTrampolineCode(masm); + + // Avoid conflicts with argument registers while discarding the result after + // the function call. + 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.loadJSContext(cxreg); + masm.enterExitFrame(cxreg, regs.getAny(), &f); + + // 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_daddu(argsBase, StackPointer, + Imm32(ExitFrameLayout::SizeWithFooter())); + } + + // Reserve space for the outparameter. + Register outReg = InvalidReg; + switch (f.outParam) { + case Type_Value: + outReg = regs.takeAny(); + masm.reserveStack(sizeof(Value)); + masm.movePtr(StackPointer, outReg); + break; + + case Type_Handle: + outReg = regs.takeAny(); + masm.PushEmptyRooted(f.outParamRootType); + masm.movePtr(StackPointer, outReg); + break; + + case Type_Bool: + case Type_Int32: + outReg = regs.takeAny(); + // Reserve 4-byte space to make stack aligned to 8-byte. + masm.reserveStack(2 * sizeof(int32_t)); + masm.movePtr(StackPointer, outReg); + break; + + case Type_Pointer: + outReg = regs.takeAny(); + masm.reserveStack(sizeof(uintptr_t)); + masm.movePtr(StackPointer, outReg); + break; + + case Type_Double: + outReg = regs.takeAny(); + masm.reserveStack(sizeof(double)); + masm.movePtr(StackPointer, outReg); + break; + + default: + MOZ_ASSERT(f.outParam == Type_Void); + break; + } + + if (!generateTLEnterVM(masm, f)) { + return false; + } + + masm.setupUnalignedABICall(regs.getAny()); + masm.passABIArg(cxreg); + + size_t argDisp = 0; + + // Copy any arguments. + for (uint32_t explicitArg = 0; explicitArg < f.explicitArgs; explicitArg++) { + switch (f.argProperties(explicitArg)) { + case VMFunctionData::WordByValue: + if (f.argPassedInFloatReg(explicitArg)) { + masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::DOUBLE); + } else { + masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::GENERAL); + } + argDisp += sizeof(void*); + break; + case VMFunctionData::WordByRef: + masm.passABIArg( + MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE_ADDRESS), + MoveOp::GENERAL); + argDisp += sizeof(void*); + break; + case VMFunctionData::DoubleByValue: + case VMFunctionData::DoubleByRef: + MOZ_CRASH("NYI: MIPS64 callVM should not be used with 128bits values."); + break; + } + } + + // Copy the implicit outparam, if any. + if (InvalidReg != outReg) { + masm.passABIArg(outReg); + } + + masm.callWithABI(nativeFun, MoveOp::GENERAL, + CheckUnsafeCallWithABI::DontCheckHasExitFrame); + + if (!generateTLExitVM(masm, f)) { + return false; + } + + // 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; + case Type_Void: + 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(StackPointer, 0), JSReturnOperand); + masm.freeStack(sizeof(Value)); + break; + + case Type_Int32: + masm.load32(Address(StackPointer, 0), ReturnReg); + masm.freeStack(2 * sizeof(int32_t)); + break; + + case Type_Pointer: + masm.loadPtr(Address(StackPointer, 0), ReturnReg); + masm.freeStack(sizeof(uintptr_t)); + break; + + case Type_Bool: + masm.load8ZeroExtend(Address(StackPointer, 0), ReturnReg); + masm.freeStack(2 * sizeof(int32_t)); + break; + + case Type_Double: + if (JitOptions.supportsFloatingPoint) { + masm.as_ldc1(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.leaveExitFrame(); + masm.retn(Imm32(sizeof(ExitFrameLayout) + + f.explicitStackSlots() * sizeof(void*) + + f.extraValuesToPop * sizeof(Value))); + + return true; +} + +uint32_t JitRuntime::generatePreBarrier(JSContext* cx, MacroAssembler& masm, + MIRType type) { + uint32_t offset = startTrampolineCode(masm); + + MOZ_ASSERT(PreBarrierReg == a1); + Register temp1 = a0; + Register temp2 = a2; + Register temp3 = a3; + masm.push(temp1); + masm.push(temp2); + masm.push(temp3); + + Label noBarrier; + masm.emitPreBarrierFastPath(cx->runtime(), type, temp1, temp2, temp3, + &noBarrier); + + // Call into C++ to mark this GC thing. + masm.pop(temp3); + masm.pop(temp2); + masm.pop(temp1); + + LiveRegisterSet save; + if (JitOptions.supportsFloatingPoint) { + save.set() = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), + FloatRegisterSet(FloatRegisters::VolatileMask)); + } else { + save.set() = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), + FloatRegisterSet()); + } + save.add(ra); + masm.PushRegsInMask(save); + + masm.movePtr(ImmPtr(cx->runtime()), a0); + + masm.setupUnalignedABICall(a2); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.callWithABI(JitMarkFunction(type)); + + save.take(AnyRegister(ra)); + masm.PopRegsInMask(save); + masm.ret(); + + masm.bind(&noBarrier); + masm.pop(temp3); + masm.pop(temp2); + masm.pop(temp1); + masm.abiret(); + + return offset; +} + +void JitRuntime::generateExceptionTailStub(MacroAssembler& masm, + Label* profilerExitTail) { + exceptionTailOffset_ = startTrampolineCode(masm); + + masm.bind(masm.failureLabel()); + masm.handleFailureWithHandlerTail(profilerExitTail); +} + +void JitRuntime::generateBailoutTailStub(MacroAssembler& masm, + Label* bailoutTail) { + bailoutTailOffset_ = startTrampolineCode(masm); + masm.bind(bailoutTail); + + masm.generateBailoutTail(a1, a2); +} + +void JitRuntime::generateProfilerExitFrameTailStub(MacroAssembler& masm, + Label* profilerExitTail) { + profilerExitFrameTailOffset_ = startTrampolineCode(masm); + masm.bind(profilerExitTail); + + 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; + masm.loadJSContext(actReg); + masm.loadPtr(Address(actReg, offsetof(JSContext, profilingActivation_)), + 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_IonICCall; + Label handle_Entry; + Label end; + + masm.branch32(Assembler::Equal, scratch2, Imm32(FrameType::IonJS), + &handle_IonJS); + masm.branch32(Assembler::Equal, scratch2, Imm32(FrameType::BaselineJS), + &handle_IonJS); + masm.branch32(Assembler::Equal, scratch2, Imm32(FrameType::BaselineStub), + &handle_BaselineStub); + masm.branch32(Assembler::Equal, scratch2, Imm32(FrameType::Rectifier), + &handle_Rectifier); + masm.branch32(Assembler::Equal, scratch2, Imm32(FrameType::IonICCall), + &handle_IonICCall); + masm.branch32(Assembler::Equal, scratch2, Imm32(FrameType::CppToJSJit), + &handle_Entry); + + // The WasmToJSJit is just another kind of entry. + masm.branch32(Assembler::Equal, scratch2, Imm32(FrameType::WasmToJSJit), + &handle_Entry); + + masm.assumeUnreachable( + "Invalid caller frame type when exiting from Ion frame."); + + // + // FrameType::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_daddu(scratch2, StackPointer, scratch1); + masm.ma_daddu(scratch2, scratch2, Imm32(JitFrameLayout::Size())); + masm.storePtr(scratch2, lastProfilingFrame); + masm.ret(); + } + + // + // FrameType::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_daddu(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(); + } + + // + // FrameType::Rectifier + // + // The rectifier frame can be preceded by either an IonJS, a BaselineStub, + // or a CppToJSJit/WasmToJSJit frame. + // + // Stack layout if caller of rectifier was Ion or CppToJSJit/WasmToJSJit: + // + // 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_daddu(scratch2, StackPointer, scratch1); + masm.addPtr(Imm32(JitFrameLayout::Size()), scratch2); + masm.loadPtr(Address(scratch2, RectifierFrameLayout::offsetOfDescriptor()), + scratch3); + masm.ma_dsrl(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 + + masm.assertRectifierFrameParentType(scratch3); + + // Check for either Ion or BaselineStub frame. + Label notIonFrame; + masm.branch32(Assembler::NotEqual, scratch3, Imm32(FrameType::IonJS), + ¬IonFrame); + + // 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_daddu(scratch3, scratch2, scratch1); + masm.addPtr(Imm32(RectifierFrameLayout::Size()), scratch3); + masm.storePtr(scratch3, lastProfilingFrame); + masm.ret(); + + masm.bind(¬IonFrame); + + // Check for either BaselineStub or a CppToJSJit/WasmToJSJit entry + // frame. + masm.branch32(Assembler::NotEqual, scratch3, Imm32(FrameType::BaselineStub), + &handle_Entry); + + // Handle Rectifier <- BaselineStub <- BaselineJS + masm.as_daddu(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(); + } + + // FrameType::IonICCall + // + // The caller is always an IonJS frame. + // + // Ion-Descriptor + // Ion-ReturnAddr + // ... ion frame data ... |- CallFrame-Descriptor.Size + // StubCode | + // ICCallFrame-Descriptor |- IonICCallFrameLayout::Size() + // ICCallFrame-ReturnAddr | + // ... call frame data & args ... |- Descriptor.Size + // ActualArgc | + // CalleeToken |- JitFrameLayout::Size() + // Descriptor | + // FP -----> ReturnAddr | + masm.bind(&handle_IonICCall); + { + // scratch2 := StackPointer + Descriptor.size + JitFrameLayout::Size() + masm.as_daddu(scratch2, StackPointer, scratch1); + masm.addPtr(Imm32(JitFrameLayout::Size()), scratch2); + + // scratch3 := ICCallFrame-Descriptor.Size + masm.loadPtr(Address(scratch2, IonICCallFrameLayout::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(FrameType::IonJS), + &checkOk); + masm.assumeUnreachable("IonICCall frame must be preceded by IonJS frame"); + masm.bind(&checkOk); + } +#endif + masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), scratch3); + + // lastProfilingCallSite := ICCallFrame-ReturnAddr + masm.loadPtr( + Address(scratch2, IonICCallFrameLayout::offsetOfReturnAddress()), + scratch1); + masm.storePtr(scratch1, lastProfilingCallSite); + + // lastProfilingFrame := ICCallFrame + ICCallFrame-Descriptor.Size + + // IonICCallFrameLayout::Size() + masm.as_daddu(scratch1, scratch2, scratch3); + masm.addPtr(Imm32(IonICCallFrameLayout::Size()), scratch1); + masm.storePtr(scratch1, lastProfilingFrame); + masm.ret(); + } + + // + // FrameType::CppToJSJit / FrameType::WasmToJSJit + // + // If at an entry frame, store null into both fields. + // A fast-path wasm->jit transition frame is an entry frame from the point + // of view of the JIT. + // + masm.bind(&handle_Entry); + { + masm.movePtr(ImmPtr(nullptr), scratch1); + masm.storePtr(scratch1, lastProfilingCallSite); + masm.storePtr(scratch1, lastProfilingFrame); + masm.ret(); + } +} |