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-rw-r--r--js/src/jit/mips64/Trampoline-mips64.cpp1363
1 files changed, 1363 insertions, 0 deletions
diff --git a/js/src/jit/mips64/Trampoline-mips64.cpp b/js/src/jit/mips64/Trampoline-mips64.cpp
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--- /dev/null
+++ b/js/src/jit/mips64/Trampoline-mips64.cpp
@@ -0,0 +1,1363 @@
+/* -*- 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/mips64/Bailouts-mips64.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;
+
+// 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;
+
+ // non-volatile registers.
+ uint64_t ra;
+ 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, 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(ra, StackPointer, offsetof(EnterJITRegs, ra));
+
+ // Restore non-volatile floating point registers
+ masm.as_ld(f24, StackPointer, offsetof(EnterJITRegs, f24));
+ masm.as_ld(f25, StackPointer, offsetof(EnterJITRegs, f25));
+ masm.as_ld(f26, StackPointer, offsetof(EnterJITRegs, f26));
+ masm.as_ld(f27, StackPointer, offsetof(EnterJITRegs, f27));
+ masm.as_ld(f28, StackPointer, offsetof(EnterJITRegs, f28));
+ masm.as_ld(f29, StackPointer, offsetof(EnterJITRegs, f29));
+ masm.as_ld(f30, StackPointer, offsetof(EnterJITRegs, f30));
+ masm.as_ld(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, 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(ra, StackPointer, offsetof(EnterJITRegs, ra));
+ masm.as_sd(a7, StackPointer, offsetof(EnterJITRegs, a7));
+
+ masm.as_sd(f24, StackPointer, offsetof(EnterJITRegs, f24));
+ masm.as_sd(f25, StackPointer, offsetof(EnterJITRegs, f25));
+ masm.as_sd(f26, StackPointer, offsetof(EnterJITRegs, f26));
+ masm.as_sd(f27, StackPointer, offsetof(EnterJITRegs, f27));
+ masm.as_sd(f28, StackPointer, offsetof(EnterJITRegs, f28));
+ masm.as_sd(f29, StackPointer, offsetof(EnterJITRegs, f29));
+ masm.as_sd(f30, StackPointer, offsetof(EnterJITRegs, f30));
+ masm.as_sd(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.
+JitCode *
+JitRuntime::generateEnterJIT(JSContext* cx, EnterJitType type)
+{
+ 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;
+ MacroAssembler masm(cx);
+
+ MOZ_ASSERT(OsrFrameReg == reg_frame);
+
+ GeneratePrologue(masm);
+
+ // Save stack pointer into s4
+ masm.movePtr(StackPointer, s4);
+
+ // Save stack pointer as baseline frame.
+ if (type == EnterJitBaseline)
+ 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)));
+ masm.as_movn(StackPointer, s1, s0);
+
+ 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, 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);
+ regs.take(JSReturnOperand);
+
+ Label notOsr;
+ masm.ma_b(OsrFrameReg, OsrFrameReg, &notOsr, 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.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_dsll(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);
+ 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_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.patchAt());
+ masm.jump(scratch);
+
+ masm.bind(&notOsr);
+ // 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);
+
+ 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 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);
+
+ 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);
+
+ // 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);
+
+ 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)
+{
+ // Do not erase the frame pointer in this function.
+
+ MacroAssembler masm(cx);
+ masm.pushReturnAddress();
+ // Caller:
+ // [arg2] [arg1] [this] [[argc] [callee] [descr] [raddr]] <- sp
+ // '--- s3 ---'
+
+ // ArgumentsRectifierReg contains the |nargs| pushed onto the current
+ // frame. Including |this|, there are (|nargs| + 1) arguments to copy.
+ MOZ_ASSERT(ArgumentsRectifierReg == s3);
+
+ // Add |this|, in the counter of known arguments.
+ masm.addPtr(Imm32(1), ArgumentsRectifierReg);
+
+ 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(&copyLoopTop);
+ 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, &copyLoopTop, Assembler::NonZero, ShortJump);
+ }
+
+ // if constructing, copy newTarget
+ {
+ Label notConstructing;
+
+ masm.branchTest32(Assembler::Zero, calleeTokenReg, Imm32(CalleeToken_FunctionConstructing),
+ &notConstructing);
+
+ // 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(&notConstructing);
+ }
+
+ // 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, 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(t2, Address(StackPointer, 0));
+
+ // Call the target function.
+ // Note that this code assumes the function is JITted.
+ masm.andPtr(Imm32(uint32_t(CalleeTokenMask)), calleeTokenReg);
+ masm.loadPtr(Address(calleeTokenReg, JSFunction::offsetOfNativeOrScript()), t1);
+ masm.loadBaselineOrIonRaw(t1, t1, nullptr);
+ uint32_t returnOffset = masm.callJitNoProfiler(t1);
+
+ // 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();
+ 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;
+}
+
+/* - 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(JSContext* cx, MacroAssembler& masm, uint32_t frameClass)
+{
+ 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);
+
+ 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);
+
+ // 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.
+ JitCode* bailoutTail = cx->runtime()->jitRuntime()->getBailoutTail();
+ masm.branch(bailoutTail);
+}
+
+JitCode*
+JitRuntime::generateBailoutTable(JSContext* cx, uint32_t frameClass)
+{
+ MOZ_CRASH("MIPS64 does not use bailout tables");
+}
+
+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_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(cx, masm, f))
+ return nullptr;
+
+ masm.setupUnalignedABICall(regs.getAny());
+ masm.passABIArg(cxreg);
+
+ size_t argDisp = 0;
+
+ // Copy any arguments.
+ for (uint32_t explicitArg = 0; explicitArg < f.explicitArgs; explicitArg++) {
+ MoveOperand from;
+ switch (f.argProperties(explicitArg)) {
+ case VMFunction::WordByValue:
+ if (f.argPassedInFloatReg(explicitArg))
+ masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::DOUBLE);
+ else
+ masm.passABIArg(MoveOperand(argsBase, argDisp), MoveOp::GENERAL);
+ argDisp += sizeof(void*);
+ break;
+ case VMFunction::WordByRef:
+ masm.passABIArg(MoveOperand(argsBase, argDisp, MoveOperand::EFFECTIVE_ADDRESS),
+ MoveOp::GENERAL);
+ argDisp += sizeof(void*);
+ break;
+ case VMFunction::DoubleByValue:
+ case VMFunction::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(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");
+ }
+
+ // 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 (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.leaveExitFrame();
+ masm.retn(Imm32(sizeof(ExitFrameLayout) +
+ f.explicitStackSlots() * sizeof(void*) +
+ f.extraValuesToPop * sizeof(Value)));
+
+ Linker linker(masm);
+ AutoFlushICache afc("VMWrapper");
+ JitCode* wrapper = linker.newCode<NoGC>(cx, OTHER_CODE);
+ if (!wrapper)
+ return nullptr;
+
+ // linker.newCode may trigger a GC and sweep functionWrappers_ so we have
+ // to use relookupOrAdd instead of add.
+ if (!functionWrappers_->relookupOrAdd(p, &f, wrapper))
+ return nullptr;
+
+#ifdef JS_ION_PERF
+ writePerfSpewerJitCodeProfile(wrapper, "VMWrapper");
+#endif
+
+ return wrapper;
+}
+
+JitCode*
+JitRuntime::generatePreBarrier(JSContext* cx, MIRType type)
+{
+ MacroAssembler masm(cx);
+
+ LiveRegisterSet save;
+ if (cx->runtime()->jitSupportsFloatingPoint) {
+ save.set() = RegisterSet(GeneralRegisterSet(Registers::VolatileMask),
+ FloatRegisterSet(FloatRegisters::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_daddu(scratch2, StackPointer, scratch1);
+ masm.ma_daddu(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_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();
+ }
+
+
+ //
+ // 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_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
+
+ // 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_daddu(scratch3, scratch2, scratch1);
+ masm.addPtr(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_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();
+ }
+
+ // 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_daddu(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_daddu(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;
+}