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Diffstat (limited to 'js/src/jit/loong64/Trampoline-loong64.cpp')
| -rw-r--r-- | js/src/jit/loong64/Trampoline-loong64.cpp | 833 |
1 files changed, 833 insertions, 0 deletions
diff --git a/js/src/jit/loong64/Trampoline-loong64.cpp b/js/src/jit/loong64/Trampoline-loong64.cpp new file mode 100644 index 0000000000..1d8b5cd7b3 --- /dev/null +++ b/js/src/jit/loong64/Trampoline-loong64.cpp @@ -0,0 +1,833 @@ +/* -*- 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 "jit/Bailouts.h" +#include "jit/BaselineFrame.h" +#include "jit/CalleeToken.h" +#include "jit/JitFrames.h" +#include "jit/JitRuntime.h" +#include "jit/loong64/SharedICHelpers-loong64.h" +#include "jit/PerfSpewer.h" +#include "jit/VMFunctions.h" +#include "vm/JitActivation.h" // js::jit::JitActivation +#include "vm/JSContext.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 s8; + 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)); + + // Restore non-volatile registers + masm.as_ld_d(s0, StackPointer, offsetof(EnterJITRegs, s0)); + masm.as_ld_d(s1, StackPointer, offsetof(EnterJITRegs, s1)); + masm.as_ld_d(s2, StackPointer, offsetof(EnterJITRegs, s2)); + masm.as_ld_d(s3, StackPointer, offsetof(EnterJITRegs, s3)); + masm.as_ld_d(s4, StackPointer, offsetof(EnterJITRegs, s4)); + masm.as_ld_d(s5, StackPointer, offsetof(EnterJITRegs, s5)); + masm.as_ld_d(s6, StackPointer, offsetof(EnterJITRegs, s6)); + masm.as_ld_d(s7, StackPointer, offsetof(EnterJITRegs, s7)); + masm.as_ld_d(s8, StackPointer, offsetof(EnterJITRegs, s8)); + masm.as_ld_d(fp, StackPointer, offsetof(EnterJITRegs, fp)); + masm.as_ld_d(ra, StackPointer, offsetof(EnterJITRegs, ra)); + + // Restore non-volatile floating point registers + masm.as_fld_d(f24, StackPointer, offsetof(EnterJITRegs, f24)); + masm.as_fld_d(f25, StackPointer, offsetof(EnterJITRegs, f25)); + masm.as_fld_d(f26, StackPointer, offsetof(EnterJITRegs, f26)); + masm.as_fld_d(f27, StackPointer, offsetof(EnterJITRegs, f27)); + masm.as_fld_d(f28, StackPointer, offsetof(EnterJITRegs, f28)); + masm.as_fld_d(f29, StackPointer, offsetof(EnterJITRegs, f29)); + masm.as_fld_d(f30, StackPointer, offsetof(EnterJITRegs, f30)); + masm.as_fld_d(f31, StackPointer, offsetof(EnterJITRegs, f31)); + + masm.freeStack(sizeof(EnterJITRegs)); + + masm.branch(ra); +} + +static void GeneratePrologue(MacroAssembler& masm) { + masm.reserveStack(sizeof(EnterJITRegs)); + + masm.as_st_d(s0, StackPointer, offsetof(EnterJITRegs, s0)); + masm.as_st_d(s1, StackPointer, offsetof(EnterJITRegs, s1)); + masm.as_st_d(s2, StackPointer, offsetof(EnterJITRegs, s2)); + masm.as_st_d(s3, StackPointer, offsetof(EnterJITRegs, s3)); + masm.as_st_d(s4, StackPointer, offsetof(EnterJITRegs, s4)); + masm.as_st_d(s5, StackPointer, offsetof(EnterJITRegs, s5)); + masm.as_st_d(s6, StackPointer, offsetof(EnterJITRegs, s6)); + masm.as_st_d(s7, StackPointer, offsetof(EnterJITRegs, s7)); + masm.as_st_d(s8, StackPointer, offsetof(EnterJITRegs, s8)); + masm.as_st_d(fp, StackPointer, offsetof(EnterJITRegs, fp)); + masm.as_st_d(ra, StackPointer, offsetof(EnterJITRegs, ra)); + masm.as_st_d(a7, StackPointer, offsetof(EnterJITRegs, a7)); + + masm.as_fst_d(f24, StackPointer, offsetof(EnterJITRegs, f24)); + masm.as_fst_d(f25, StackPointer, offsetof(EnterJITRegs, f25)); + masm.as_fst_d(f26, StackPointer, offsetof(EnterJITRegs, f26)); + masm.as_fst_d(f27, StackPointer, offsetof(EnterJITRegs, f27)); + masm.as_fst_d(f28, StackPointer, offsetof(EnterJITRegs, f28)); + masm.as_fst_d(f29, StackPointer, offsetof(EnterJITRegs, f29)); + masm.as_fst_d(f30, StackPointer, offsetof(EnterJITRegs, f30)); + masm.as_fst_d(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) { + AutoCreatedBy acb(masm, "JitRuntime::generateEnterJIT"); + + 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 as baseline frame. + masm.movePtr(StackPointer, FramePointer); + + // 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_sub_d(s1, zero, Imm32(sizeof(Value))); + masm.as_maskeqz(s1, s1, s0); + masm.as_add_d(StackPointer, StackPointer, s1); + + masm.as_slli_d(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.push(reg_token); + masm.pushFrameDescriptorForJitCall(FrameType::CppToJSJit, s3, s3); + + CodeLabel returnLabel; + Label oomReturnLabel; + { + // Handle Interpreter -> Baseline OSR. + AllocatableGeneralRegisterSet regs(GeneralRegisterSet::All()); + MOZ_ASSERT(!regs.has(FramePointer)); + regs.take(OsrFrameReg); + regs.take(reg_code); + MOZ_ASSERT(!regs.has(ReturnReg), "ReturnReg matches reg_code"); + + 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(FramePointer, Address(StackPointer, 0)); + + // Reserve frame. + Register framePtr = FramePointer; + masm.movePtr(StackPointer, framePtr); + masm.subPtr(Imm32(BaselineFrame::Size()), StackPointer); + + Register framePtrScratch = regs.takeAny(); + masm.movePtr(sp, framePtrScratch); + + // Reserve space for locals and stack values. + masm.as_slli_d(scratch, numStackValues, 3); + masm.subPtr(scratch, StackPointer); + + // Enter exit frame. + masm.reserveStack(3 * sizeof(uintptr_t)); + masm.storePtr( + ImmWord(MakeFrameDescriptor(FrameType::BaselineJS)), + Address(StackPointer, 2 * sizeof(uintptr_t))); // Frame descriptor + masm.storePtr( + zero, Address(StackPointer, sizeof(uintptr_t))); // fake return address + masm.storePtr(FramePointer, Address(StackPointer, 0)); + + // 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(framePtrScratch); // 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.branchIfFalseBool(ReturnReg, &error); + + // If OSR-ing, then emit instrumentation for setting lastProfilerFrame + // if profiler instrumentation is enabled. + { + Label skipProfilingInstrumentation; + AbsoluteAddress addressOfEnabled( + cx->runtime()->geckoProfiler().addressOfEnabled()); + masm.branch32(Assembler::Equal, addressOfEnabled, Imm32(0), + &skipProfilingInstrumentation); + masm.profilerEnterFrame(framePtr, 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.jump(&oomReturnLabel); + + masm.bind(¬Osr); + // Load the scope chain in R1. + MOZ_ASSERT(R1.scratchReg() != reg_code); + masm.as_or(R1.scratchReg(), reg_chain, zero); + } + + // The call will push the return address and frame pointer on the stack, thus + // we check that the stack would be aligned once the call is complete. + masm.assertStackAlignment(JitStackAlignment, 2 * 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); + } + + // Discard arguments and padding. Set sp to the address of the EnterJITRegs + // on the stack. + masm.mov(FramePointer, StackPointer); + + // Store the returned value into the vp + masm.as_ld_d(reg_vp, StackPointer, offsetof(EnterJITRegs, a7)); + masm.storeValue(JSReturnOperand, Address(reg_vp, 0)); + + // Restore non-volatile registers and return. + GenerateReturn(masm, ShortJump); +} + +// static +mozilla::Maybe<::JS::ProfilingFrameIterator::RegisterState> +JitRuntime::getCppEntryRegisters(JitFrameLayout* frameStackAddress) { + // Not supported, or not implemented yet. + // TODO: Implement along with the corresponding stack-walker changes, in + // coordination with the Gecko Profiler, see bug 1635987 and follow-ups. + return mozilla::Nothing{}; +} + +void JitRuntime::generateInvalidator(MacroAssembler& masm, Label* bailoutTail) { + AutoCreatedBy acb(masm, "JitRuntime::generateInvalidator"); + + 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 BailoutInfo pointer. Two words to ensure alignment for + // setupAlignedABICall. + masm.subPtr(Imm32(2 * sizeof(uintptr_t)), StackPointer); + // Pass pointer to BailoutInfo + masm.movePtr(StackPointer, a1); + + using Fn = + bool (*)(InvalidationBailoutStack * sp, BaselineBailoutInfo * *info); + masm.setupAlignedABICall(); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.callWithABI<Fn, InvalidationBailout>( + MoveOp::GENERAL, CheckUnsafeCallWithABI::DontCheckOther); + + masm.pop(a2); + + // Pop the machine state and the dead frame. + masm.moveToStackPtr(FramePointer); + + // 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. + + AutoCreatedBy acb(masm, "JitRuntime::generateArgumentsRectifier"); + + 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 + + // Frame prologue. + // + // NOTE: if this changes, fix the Baseline bailout code too! + // See BaselineStackBuilder::calculatePrevFramePtr and + // BaselineStackBuilder::buildRectifierFrame (in BaselineBailouts.cpp). + masm.push(FramePointer); + masm.mov(StackPointer, FramePointer); + + // Load argc. + masm.loadNumActualArgs(FramePointer, s3); + + Register numActArgsReg = a6; + Register calleeTokenReg = a7; + Register numArgsReg = a5; + + // Load |nformals| into numArgsReg. + masm.loadPtr( + Address(FramePointer, RectifierFrameLayout::offsetOfCalleeToken()), + calleeTokenReg); + masm.mov(calleeTokenReg, numArgsReg); + masm.andPtr(Imm32(uint32_t(CalleeTokenMask)), numArgsReg); + masm.loadFunctionArgCount(numArgsReg, 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, 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. Subtract 1 for |this|. + masm.as_sub_d(t1, numArgsReg, s3); + masm.sub32(Imm32(1), t1); + + // Caller: + // [arg2] [arg1] [this] [ [argc] [callee] [descr] [raddr] ] <- sp + // '--- s3 ----' + // + // Rectifier frame: + // [fp'] [undef] [undef] [undef] [arg2] [arg1] [this] [ [argc] [callee] + // [descr] [raddr] ] + // '-------- t1 ---------' '--- s3 ----' + + // Copy number of actual arguments into numActArgsReg. + masm.mov(s3, numActArgsReg); + + masm.moveValue(UndefinedValue(), ValueOperand(t0)); + + // 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"); + + // Get the topmost argument. + masm.as_slli_d(t0, s3, 3); // t0 <- nargs * 8 + masm.as_add_d(t1, FramePointer, t0); // t1 <- fp(saved sp) + nargs * 8 + masm.addPtr(Imm32(sizeof(RectifierFrameLayout)), t1); + + // Push arguments, |nargs| + 1 times (to include |this|). + masm.addPtr(Imm32(1), s3); + { + 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); + + // Load vp[argc]. Add sizeof(Value) for |this|. + BaseIndex newTargetSrc(FramePointer, 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] ] + // + // + // Rectifier frame: + // [fp'] <- fp [undef] [undef] [undef] [arg2] [arg1] [this] <- sp [ [argc] + // [callee] [descr] [raddr] ] + // + + // Construct JitFrameLayout. + masm.push(calleeTokenReg); + masm.pushFrameDescriptorForJitCall(FrameType::Rectifier, numActArgsReg, + numActArgsReg); + + // 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; + } + + masm.mov(FramePointer, StackPointer); + masm.pop(FramePointer); + masm.ret(); +} + +/* - When bailout is done via out of line code (lazy bailout). + * Frame size is stored in $ra (look at + * CodeGeneratorLOONG64::generateOutOfLineCode()) and thunk code should save it + * on stack. Other difference is that members snapshotOffset_ and padding_ are + * pushed to the stack by CodeGeneratorLOONG64::visitOutOfLineBailout(). + */ +static void PushBailoutFrame(MacroAssembler& masm, Register spArg) { + // Push the frameSize_ stored in ra + // See: CodeGeneratorLOONG64::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, Label* bailoutTail) { + PushBailoutFrame(masm, a0); + + // Make space for Bailout's bailoutInfo outparam. + masm.reserveStack(sizeof(void*)); + masm.movePtr(StackPointer, a1); + + // Call the bailout function. + using Fn = bool (*)(BailoutStack * sp, BaselineBailoutInfo * *info); + masm.setupUnalignedABICall(a2); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.callWithABI<Fn, Bailout>(MoveOp::GENERAL, + CheckUnsafeCallWithABI::DontCheckOther); + + // Get the bailoutInfo outparam. + masm.pop(a2); + + // Remove both the bailout frame and the topmost Ion frame's stack. + masm.moveToStackPtr(FramePointer); + + // Jump to shared bailout tail. The BailoutInfo pointer has to be in a2. + masm.jump(bailoutTail); +} + +void JitRuntime::generateBailoutHandler(MacroAssembler& masm, + Label* bailoutTail) { + AutoCreatedBy acb(masm, "JitRuntime::generateBailoutHandler"); + + bailoutHandlerOffset_ = startTrampolineCode(masm); + + GenerateBailoutThunk(masm, bailoutTail); +} + +bool JitRuntime::generateVMWrapper(JSContext* cx, MacroAssembler& masm, + const VMFunctionData& f, DynFn nativeFun, + uint32_t* wrapperOffset) { + AutoCreatedBy acb(masm, "JitRuntime::generateVMWrapper"); + + *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(); + } + + // Push the frame pointer to finish the exit frame, then link it up. + masm.Push(FramePointer); + 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_add_d(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; + } + + 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: LOONG64 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); + + // Test for failure. + switch (f.failType()) { + case Type_Cell: + masm.branchTestPtr(Assembler::Zero, a0, a0, masm.failureLabel()); + break; + case Type_Bool: + // Called functions return bools, which are 0/false and non-zero/true + masm.branchIfFalseBool(a0, 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: + masm.as_fld_d(ReturnDoubleReg, StackPointer, 0); + masm.freeStack(sizeof(double)); + break; + + default: + MOZ_ASSERT(f.outParam == Type_Void); + break; + } + + // Pop ExitFooterFrame and the frame pointer. + masm.leaveExitFrame(sizeof(void*)); + + // Return. Subtract sizeof(void*) for the frame pointer. + masm.retn(Imm32(sizeof(ExitFrameLayout) - sizeof(void*) + + f.explicitStackSlots() * sizeof(void*) + + f.extraValuesToPop * sizeof(Value))); + + return true; +} + +uint32_t JitRuntime::generatePreBarrier(JSContext* cx, MacroAssembler& masm, + MIRType type) { + AutoCreatedBy acb(masm, "JitRuntime::generatePreBarrier"); + + 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; + save.set() = RegisterSet(GeneralRegisterSet(Registers::VolatileMask), + FloatRegisterSet(FloatRegisters::VolatileMask)); + masm.push(ra); + masm.PushRegsInMask(save); + + masm.movePtr(ImmPtr(cx->runtime()), a0); + + masm.setupUnalignedABICall(a2); + masm.passABIArg(a0); + masm.passABIArg(a1); + masm.callWithABI(JitPreWriteBarrier(type)); + + masm.PopRegsInMask(save); + masm.ret(); + + masm.bind(&noBarrier); + masm.pop(temp3); + masm.pop(temp2); + masm.pop(temp1); + masm.abiret(); + + return offset; +} + +void JitRuntime::generateBailoutTailStub(MacroAssembler& masm, + Label* bailoutTail) { + AutoCreatedBy acb(masm, "JitRuntime::generateBailoutTailStub"); + + masm.bind(bailoutTail); + masm.generateBailoutTail(a1, a2); +} |