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diff --git a/js/src/jit/BaselineIC.cpp b/js/src/jit/BaselineIC.cpp
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+/* -*- 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/BaselineIC.h"
+
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Sprintf.h"
+
+#include "jstypes.h"
+
+#include "builtin/Eval.h"
+#include "jit/BaselineCacheIRCompiler.h"
+#include "jit/CacheIRGenerator.h"
+#include "jit/CacheIRHealth.h"
+#include "jit/JitFrames.h"
+#include "jit/JitRuntime.h"
+#include "jit/JitSpewer.h"
+#include "jit/Linker.h"
+#include "jit/PerfSpewer.h"
+#include "jit/SharedICHelpers.h"
+#include "jit/SharedICRegisters.h"
+#include "jit/VMFunctions.h"
+#include "js/Conversions.h"
+#include "js/friend/ErrorMessages.h" // JSMSG_*
+#include "vm/BytecodeIterator.h"
+#include "vm/BytecodeLocation.h"
+#include "vm/BytecodeUtil.h"
+#include "vm/EqualityOperations.h"
+#include "vm/JSFunction.h"
+#include "vm/JSScript.h"
+#include "vm/Opcodes.h"
+#ifdef MOZ_VTUNE
+# include "vtune/VTuneWrapper.h"
+#endif
+
+#include "jit/MacroAssembler-inl.h"
+#include "jit/SharedICHelpers-inl.h"
+#include "jit/VMFunctionList-inl.h"
+#include "vm/BytecodeIterator-inl.h"
+#include "vm/BytecodeLocation-inl.h"
+#include "vm/EnvironmentObject-inl.h"
+#include "vm/Interpreter-inl.h"
+#include "vm/JSScript-inl.h"
+
+using mozilla::DebugOnly;
+
+namespace js {
+namespace jit {
+
+// Class used to emit all Baseline IC fallback code when initializing the
+// JitRuntime.
+class MOZ_RAII FallbackICCodeCompiler final {
+ BaselineICFallbackCode& code;
+ MacroAssembler& masm;
+
+ JSContext* cx;
+ bool inStubFrame_ = false;
+
+#ifdef DEBUG
+ bool entersStubFrame_ = false;
+ uint32_t framePushedAtEnterStubFrame_ = 0;
+#endif
+
+ [[nodiscard]] bool emitCall(bool isSpread, bool isConstructing);
+ [[nodiscard]] bool emitGetElem(bool hasReceiver);
+ [[nodiscard]] bool emitGetProp(bool hasReceiver);
+
+ public:
+ FallbackICCodeCompiler(JSContext* cx, BaselineICFallbackCode& code,
+ MacroAssembler& masm)
+ : code(code), masm(masm), cx(cx) {}
+
+#define DEF_METHOD(kind) [[nodiscard]] bool emit_##kind();
+ IC_BASELINE_FALLBACK_CODE_KIND_LIST(DEF_METHOD)
+#undef DEF_METHOD
+
+ void pushCallArguments(MacroAssembler& masm,
+ AllocatableGeneralRegisterSet regs, Register argcReg,
+ bool isConstructing);
+
+ // Push a payload specialized per compiler needed to execute stubs.
+ void PushStubPayload(MacroAssembler& masm, Register scratch);
+ void pushStubPayload(MacroAssembler& masm, Register scratch);
+
+ // Emits a tail call to a VMFunction wrapper.
+ [[nodiscard]] bool tailCallVMInternal(MacroAssembler& masm,
+ TailCallVMFunctionId id);
+
+ template <typename Fn, Fn fn>
+ [[nodiscard]] bool tailCallVM(MacroAssembler& masm);
+
+ // Emits a normal (non-tail) call to a VMFunction wrapper.
+ [[nodiscard]] bool callVMInternal(MacroAssembler& masm, VMFunctionId id);
+
+ template <typename Fn, Fn fn>
+ [[nodiscard]] bool callVM(MacroAssembler& masm);
+
+ // A stub frame is used when a stub wants to call into the VM without
+ // performing a tail call. This is required for the return address
+ // to pc mapping to work.
+ void enterStubFrame(MacroAssembler& masm, Register scratch);
+ void assumeStubFrame();
+ void leaveStubFrame(MacroAssembler& masm);
+};
+
+AllocatableGeneralRegisterSet BaselineICAvailableGeneralRegs(size_t numInputs) {
+ AllocatableGeneralRegisterSet regs(GeneralRegisterSet::All());
+ MOZ_ASSERT(!regs.has(FramePointer));
+#if defined(JS_CODEGEN_ARM)
+ MOZ_ASSERT(!regs.has(ICTailCallReg));
+ regs.take(BaselineSecondScratchReg);
+#elif defined(JS_CODEGEN_MIPS32) || defined(JS_CODEGEN_MIPS64)
+ MOZ_ASSERT(!regs.has(ICTailCallReg));
+ MOZ_ASSERT(!regs.has(BaselineSecondScratchReg));
+#elif defined(JS_CODEGEN_ARM64)
+ MOZ_ASSERT(!regs.has(PseudoStackPointer));
+ MOZ_ASSERT(!regs.has(RealStackPointer));
+ MOZ_ASSERT(!regs.has(ICTailCallReg));
+#endif
+ regs.take(ICStubReg);
+
+ switch (numInputs) {
+ case 0:
+ break;
+ case 1:
+ regs.take(R0);
+ break;
+ case 2:
+ regs.take(R0);
+ regs.take(R1);
+ break;
+ default:
+ MOZ_CRASH("Invalid numInputs");
+ }
+
+ return regs;
+}
+
+static jsbytecode* StubOffsetToPc(const ICFallbackStub* stub,
+ const JSScript* script) {
+ return script->offsetToPC(stub->pcOffset());
+}
+
+#ifdef JS_JITSPEW
+void FallbackICSpew(JSContext* cx, ICFallbackStub* stub, const char* fmt, ...) {
+ if (JitSpewEnabled(JitSpew_BaselineICFallback)) {
+ RootedScript script(cx, GetTopJitJSScript(cx));
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+
+ char fmtbuf[100];
+ va_list args;
+ va_start(args, fmt);
+ (void)VsprintfLiteral(fmtbuf, fmt, args);
+ va_end(args);
+
+ JitSpew(
+ JitSpew_BaselineICFallback,
+ "Fallback hit for (%s:%u:%u) (pc=%zu,line=%u,uses=%u,stubs=%zu): %s",
+ script->filename(), script->lineno(), script->column(),
+ script->pcToOffset(pc), PCToLineNumber(script, pc),
+ script->getWarmUpCount(), stub->numOptimizedStubs(), fmtbuf);
+ }
+}
+#endif // JS_JITSPEW
+
+void ICEntry::trace(JSTracer* trc) {
+ ICStub* stub = firstStub();
+
+ // Trace CacheIR stubs.
+ while (!stub->isFallback()) {
+ stub->toCacheIRStub()->trace(trc);
+ stub = stub->toCacheIRStub()->next();
+ }
+
+ // Fallback stubs use runtime-wide trampoline code we don't need to trace.
+ MOZ_ASSERT(stub->usesTrampolineCode());
+}
+
+// constexpr table mapping JSOp to BaselineICFallbackKind. Each value in the
+// table is either a fallback kind or a sentinel value (NoICValue) indicating
+// the JSOp is not a JOF_IC op.
+class MOZ_STATIC_CLASS OpToFallbackKindTable {
+ static_assert(sizeof(BaselineICFallbackKind) == sizeof(uint8_t));
+ uint8_t table_[JSOP_LIMIT] = {};
+
+ constexpr void setKind(JSOp op, BaselineICFallbackKind kind) {
+ MOZ_ASSERT(uint8_t(kind) != NoICValue);
+ table_[size_t(op)] = uint8_t(kind);
+ }
+
+ public:
+ static constexpr uint8_t NoICValue = uint8_t(BaselineICFallbackKind::Count);
+
+ uint8_t lookup(JSOp op) const { return table_[size_t(op)]; }
+
+ constexpr OpToFallbackKindTable() {
+ for (size_t i = 0; i < JSOP_LIMIT; i++) {
+ table_[i] = NoICValue;
+ }
+
+ setKind(JSOp::Not, BaselineICFallbackKind::ToBool);
+ setKind(JSOp::And, BaselineICFallbackKind::ToBool);
+ setKind(JSOp::Or, BaselineICFallbackKind::ToBool);
+ setKind(JSOp::JumpIfTrue, BaselineICFallbackKind::ToBool);
+ setKind(JSOp::JumpIfFalse, BaselineICFallbackKind::ToBool);
+
+ setKind(JSOp::BitNot, BaselineICFallbackKind::UnaryArith);
+ setKind(JSOp::Pos, BaselineICFallbackKind::UnaryArith);
+ setKind(JSOp::Neg, BaselineICFallbackKind::UnaryArith);
+ setKind(JSOp::Inc, BaselineICFallbackKind::UnaryArith);
+ setKind(JSOp::Dec, BaselineICFallbackKind::UnaryArith);
+ setKind(JSOp::ToNumeric, BaselineICFallbackKind::UnaryArith);
+
+ setKind(JSOp::BitOr, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::BitXor, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::BitAnd, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Lsh, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Rsh, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Ursh, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Add, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Sub, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Mul, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Div, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Mod, BaselineICFallbackKind::BinaryArith);
+ setKind(JSOp::Pow, BaselineICFallbackKind::BinaryArith);
+
+ setKind(JSOp::Eq, BaselineICFallbackKind::Compare);
+ setKind(JSOp::Ne, BaselineICFallbackKind::Compare);
+ setKind(JSOp::Lt, BaselineICFallbackKind::Compare);
+ setKind(JSOp::Le, BaselineICFallbackKind::Compare);
+ setKind(JSOp::Gt, BaselineICFallbackKind::Compare);
+ setKind(JSOp::Ge, BaselineICFallbackKind::Compare);
+ setKind(JSOp::StrictEq, BaselineICFallbackKind::Compare);
+ setKind(JSOp::StrictNe, BaselineICFallbackKind::Compare);
+
+ setKind(JSOp::NewArray, BaselineICFallbackKind::NewArray);
+
+ setKind(JSOp::NewObject, BaselineICFallbackKind::NewObject);
+ setKind(JSOp::NewInit, BaselineICFallbackKind::NewObject);
+
+ setKind(JSOp::InitElem, BaselineICFallbackKind::SetElem);
+ setKind(JSOp::InitHiddenElem, BaselineICFallbackKind::SetElem);
+ setKind(JSOp::InitLockedElem, BaselineICFallbackKind::SetElem);
+ setKind(JSOp::InitElemInc, BaselineICFallbackKind::SetElem);
+ setKind(JSOp::SetElem, BaselineICFallbackKind::SetElem);
+ setKind(JSOp::StrictSetElem, BaselineICFallbackKind::SetElem);
+
+ setKind(JSOp::InitProp, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::InitLockedProp, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::InitHiddenProp, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::InitGLexical, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::SetProp, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::StrictSetProp, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::SetName, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::StrictSetName, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::SetGName, BaselineICFallbackKind::SetProp);
+ setKind(JSOp::StrictSetGName, BaselineICFallbackKind::SetProp);
+
+ setKind(JSOp::GetProp, BaselineICFallbackKind::GetProp);
+ setKind(JSOp::GetBoundName, BaselineICFallbackKind::GetProp);
+
+ setKind(JSOp::GetPropSuper, BaselineICFallbackKind::GetPropSuper);
+
+ setKind(JSOp::GetElem, BaselineICFallbackKind::GetElem);
+
+ setKind(JSOp::GetElemSuper, BaselineICFallbackKind::GetElemSuper);
+
+ setKind(JSOp::In, BaselineICFallbackKind::In);
+
+ setKind(JSOp::HasOwn, BaselineICFallbackKind::HasOwn);
+
+ setKind(JSOp::CheckPrivateField, BaselineICFallbackKind::CheckPrivateField);
+
+ setKind(JSOp::GetName, BaselineICFallbackKind::GetName);
+ setKind(JSOp::GetGName, BaselineICFallbackKind::GetName);
+
+ setKind(JSOp::BindName, BaselineICFallbackKind::BindName);
+ setKind(JSOp::BindGName, BaselineICFallbackKind::BindName);
+
+ setKind(JSOp::GetIntrinsic, BaselineICFallbackKind::GetIntrinsic);
+
+ setKind(JSOp::Call, BaselineICFallbackKind::Call);
+ setKind(JSOp::CallContent, BaselineICFallbackKind::Call);
+ setKind(JSOp::CallIgnoresRv, BaselineICFallbackKind::Call);
+ setKind(JSOp::CallIter, BaselineICFallbackKind::Call);
+ setKind(JSOp::CallContentIter, BaselineICFallbackKind::Call);
+ setKind(JSOp::Eval, BaselineICFallbackKind::Call);
+ setKind(JSOp::StrictEval, BaselineICFallbackKind::Call);
+
+ setKind(JSOp::SuperCall, BaselineICFallbackKind::CallConstructing);
+ setKind(JSOp::New, BaselineICFallbackKind::CallConstructing);
+ setKind(JSOp::NewContent, BaselineICFallbackKind::CallConstructing);
+
+ setKind(JSOp::SpreadCall, BaselineICFallbackKind::SpreadCall);
+ setKind(JSOp::SpreadEval, BaselineICFallbackKind::SpreadCall);
+ setKind(JSOp::StrictSpreadEval, BaselineICFallbackKind::SpreadCall);
+
+ setKind(JSOp::SpreadSuperCall,
+ BaselineICFallbackKind::SpreadCallConstructing);
+ setKind(JSOp::SpreadNew, BaselineICFallbackKind::SpreadCallConstructing);
+
+ setKind(JSOp::Instanceof, BaselineICFallbackKind::InstanceOf);
+
+ setKind(JSOp::Typeof, BaselineICFallbackKind::TypeOf);
+ setKind(JSOp::TypeofExpr, BaselineICFallbackKind::TypeOf);
+
+ setKind(JSOp::ToPropertyKey, BaselineICFallbackKind::ToPropertyKey);
+
+ setKind(JSOp::Iter, BaselineICFallbackKind::GetIterator);
+
+ setKind(JSOp::OptimizeSpreadCall,
+ BaselineICFallbackKind::OptimizeSpreadCall);
+
+ setKind(JSOp::Rest, BaselineICFallbackKind::Rest);
+
+ setKind(JSOp::CloseIter, BaselineICFallbackKind::CloseIter);
+ }
+};
+
+static constexpr OpToFallbackKindTable FallbackKindTable;
+
+void ICScript::initICEntries(JSContext* cx, JSScript* script) {
+ MOZ_ASSERT(cx->realm()->jitRealm());
+ MOZ_ASSERT(jit::IsBaselineInterpreterEnabled());
+
+ MOZ_ASSERT(numICEntries() == script->numICEntries());
+
+ // Index of the next ICEntry to initialize.
+ uint32_t icEntryIndex = 0;
+
+ const BaselineICFallbackCode& fallbackCode =
+ cx->runtime()->jitRuntime()->baselineICFallbackCode();
+
+ // For JOF_IC ops: initialize ICEntries and fallback stubs.
+ for (BytecodeLocation loc : js::AllBytecodesIterable(script)) {
+ JSOp op = loc.getOp();
+
+ // Assert the frontend stored the correct IC index in jump target ops.
+ MOZ_ASSERT_IF(BytecodeIsJumpTarget(op), loc.icIndex() == icEntryIndex);
+
+ uint8_t tableValue = FallbackKindTable.lookup(op);
+
+ if (tableValue == OpToFallbackKindTable::NoICValue) {
+ MOZ_ASSERT(!BytecodeOpHasIC(op),
+ "Missing entry in OpToFallbackKindTable for JOF_IC op");
+ continue;
+ }
+
+ MOZ_ASSERT(BytecodeOpHasIC(op),
+ "Unexpected fallback kind for non-JOF_IC op");
+
+ BaselineICFallbackKind kind = BaselineICFallbackKind(tableValue);
+ TrampolinePtr stubCode = fallbackCode.addr(kind);
+
+ // Initialize the ICEntry and ICFallbackStub.
+ uint32_t offset = loc.bytecodeToOffset(script);
+ ICEntry& entryRef = this->icEntry(icEntryIndex);
+ ICFallbackStub* stub = fallbackStub(icEntryIndex);
+ icEntryIndex++;
+ new (&entryRef) ICEntry(stub);
+ new (stub) ICFallbackStub(offset, stubCode);
+ }
+
+ // Assert all ICEntries have been initialized.
+ MOZ_ASSERT(icEntryIndex == numICEntries());
+}
+
+bool ICSupportsPolymorphicTypeData(JSOp op) {
+ MOZ_ASSERT(BytecodeOpHasIC(op));
+ BaselineICFallbackKind kind =
+ BaselineICFallbackKind(FallbackKindTable.lookup(op));
+ switch (kind) {
+ case BaselineICFallbackKind::ToBool:
+ case BaselineICFallbackKind::TypeOf:
+ return true;
+ default:
+ return false;
+ }
+}
+
+bool ICCacheIRStub::makesGCCalls() const { return stubInfo()->makesGCCalls(); }
+
+void ICFallbackStub::trackNotAttached() { state().trackNotAttached(); }
+
+// When we enter a baseline fallback stub, if a Warp compilation
+// exists that transpiled that IC, we notify that compilation. This
+// helps the bailout code tell whether a bailing instruction hoisted
+// by LICM would have been executed anyway.
+static void MaybeNotifyWarp(JSScript* script, ICFallbackStub* stub) {
+ if (stub->state().usedByTranspiler() && script->hasIonScript()) {
+ script->ionScript()->noteBaselineFallback();
+ }
+}
+
+void ICCacheIRStub::trace(JSTracer* trc) {
+ JitCode* stubJitCode = jitCode();
+ TraceManuallyBarrieredEdge(trc, &stubJitCode, "baseline-ic-stub-code");
+
+ TraceCacheIRStub(trc, this, stubInfo());
+}
+
+static void MaybeTransition(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub) {
+ if (stub->state().shouldTransition()) {
+ if (!TryFoldingStubs(cx, stub, frame->script(), frame->icScript())) {
+ cx->recoverFromOutOfMemory();
+ }
+ if (stub->state().maybeTransition()) {
+ ICEntry* icEntry = frame->icScript()->icEntryForStub(stub);
+#ifdef JS_CACHEIR_SPEW
+ if (cx->spewer().enabled(cx, frame->script(),
+ SpewChannel::CacheIRHealthReport)) {
+ CacheIRHealth cih;
+ RootedScript script(cx, frame->script());
+ cih.healthReportForIC(cx, icEntry, stub, script,
+ SpewContext::Transition);
+ }
+#endif
+ stub->discardStubs(cx, icEntry);
+ }
+ }
+}
+
+// This helper handles ICState updates/transitions while attaching CacheIR
+// stubs.
+template <typename IRGenerator, typename... Args>
+static void TryAttachStub(const char* name, JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, Args&&... args) {
+ MaybeTransition(cx, frame, stub);
+
+ if (stub->state().canAttachStub()) {
+ RootedScript script(cx, frame->script());
+ ICScript* icScript = frame->icScript();
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ bool attached = false;
+ IRGenerator gen(cx, script, pc, stub->state(), std::forward<Args>(args)...);
+ switch (gen.tryAttachStub()) {
+ case AttachDecision::Attach: {
+ ICAttachResult result =
+ AttachBaselineCacheIRStub(cx, gen.writerRef(), gen.cacheKind(),
+ script, icScript, stub, gen.stubName());
+ if (result == ICAttachResult::Attached) {
+ attached = true;
+ JitSpew(JitSpew_BaselineIC, " Attached %s CacheIR stub", name);
+ }
+ } break;
+ case AttachDecision::NoAction:
+ break;
+ case AttachDecision::TemporarilyUnoptimizable:
+ case AttachDecision::Deferred:
+ MOZ_ASSERT_UNREACHABLE("Not expected in generic TryAttachStub");
+ break;
+ }
+ if (!attached) {
+ stub->trackNotAttached();
+ }
+ }
+}
+
+void ICFallbackStub::unlinkStub(Zone* zone, ICEntry* icEntry,
+ ICCacheIRStub* prev, ICCacheIRStub* stub) {
+ if (prev) {
+ MOZ_ASSERT(prev->next() == stub);
+ prev->setNext(stub->next());
+ } else {
+ MOZ_ASSERT(icEntry->firstStub() == stub);
+ icEntry->setFirstStub(stub->next());
+ }
+
+ state_.trackUnlinkedStub();
+
+ // We are removing edges from ICStub to gcthings. Perform a barrier to let the
+ // GC know about those edges.
+ PreWriteBarrier(zone, stub);
+
+#ifdef DEBUG
+ // Poison stub code to ensure we don't call this stub again. However, if
+ // this stub can make calls, a pointer to it may be stored in a stub frame
+ // on the stack, so we can't touch the stubCode_ or GC will crash when
+ // tracing this pointer.
+ if (!stub->makesGCCalls()) {
+ stub->stubCode_ = (uint8_t*)0xbad;
+ }
+#endif
+}
+
+void ICFallbackStub::discardStubs(JSContext* cx, ICEntry* icEntry) {
+ ICStub* stub = icEntry->firstStub();
+ while (stub != this) {
+ unlinkStub(cx->zone(), icEntry, /* prev = */ nullptr,
+ stub->toCacheIRStub());
+ stub = stub->toCacheIRStub()->next();
+ }
+ clearHasFoldedStub();
+}
+
+static void InitMacroAssemblerForICStub(StackMacroAssembler& masm) {
+#ifndef JS_USE_LINK_REGISTER
+ // The first value contains the return addres,
+ // which we pull into ICTailCallReg for tail calls.
+ masm.adjustFrame(sizeof(intptr_t));
+#endif
+#ifdef JS_CODEGEN_ARM
+ masm.setSecondScratchReg(BaselineSecondScratchReg);
+#endif
+}
+
+bool FallbackICCodeCompiler::tailCallVMInternal(MacroAssembler& masm,
+ TailCallVMFunctionId id) {
+ TrampolinePtr code = cx->runtime()->jitRuntime()->getVMWrapper(id);
+ const VMFunctionData& fun = GetVMFunction(id);
+ MOZ_ASSERT(fun.expectTailCall == TailCall);
+ uint32_t argSize = fun.explicitStackSlots() * sizeof(void*);
+ EmitBaselineTailCallVM(code, masm, argSize);
+ return true;
+}
+
+bool FallbackICCodeCompiler::callVMInternal(MacroAssembler& masm,
+ VMFunctionId id) {
+ MOZ_ASSERT(inStubFrame_);
+
+ TrampolinePtr code = cx->runtime()->jitRuntime()->getVMWrapper(id);
+ MOZ_ASSERT(GetVMFunction(id).expectTailCall == NonTailCall);
+
+ EmitBaselineCallVM(code, masm);
+ return true;
+}
+
+template <typename Fn, Fn fn>
+bool FallbackICCodeCompiler::callVM(MacroAssembler& masm) {
+ VMFunctionId id = VMFunctionToId<Fn, fn>::id;
+ return callVMInternal(masm, id);
+}
+
+template <typename Fn, Fn fn>
+bool FallbackICCodeCompiler::tailCallVM(MacroAssembler& masm) {
+ TailCallVMFunctionId id = TailCallVMFunctionToId<Fn, fn>::id;
+ return tailCallVMInternal(masm, id);
+}
+
+void FallbackICCodeCompiler::enterStubFrame(MacroAssembler& masm,
+ Register scratch) {
+ EmitBaselineEnterStubFrame(masm, scratch);
+#ifdef DEBUG
+ framePushedAtEnterStubFrame_ = masm.framePushed();
+#endif
+
+ MOZ_ASSERT(!inStubFrame_);
+ inStubFrame_ = true;
+
+#ifdef DEBUG
+ entersStubFrame_ = true;
+#endif
+}
+
+void FallbackICCodeCompiler::assumeStubFrame() {
+ MOZ_ASSERT(!inStubFrame_);
+ inStubFrame_ = true;
+
+#ifdef DEBUG
+ entersStubFrame_ = true;
+
+ // |framePushed| isn't tracked precisely in ICStubs, so simply assume it to
+ // be the stub frame layout and the pushed ICStub* so that assertions don't
+ // fail in leaveStubFrame
+ framePushedAtEnterStubFrame_ =
+ BaselineStubFrameLayout::Size() + sizeof(ICStub*);
+#endif
+}
+
+void FallbackICCodeCompiler::leaveStubFrame(MacroAssembler& masm) {
+ MOZ_ASSERT(entersStubFrame_ && inStubFrame_);
+ inStubFrame_ = false;
+
+#ifdef DEBUG
+ masm.setFramePushed(framePushedAtEnterStubFrame_);
+#endif
+ EmitBaselineLeaveStubFrame(masm);
+}
+
+void FallbackICCodeCompiler::pushStubPayload(MacroAssembler& masm,
+ Register scratch) {
+ if (inStubFrame_) {
+ masm.loadPtr(Address(FramePointer, 0), scratch);
+ masm.pushBaselineFramePtr(scratch, scratch);
+ } else {
+ masm.pushBaselineFramePtr(FramePointer, scratch);
+ }
+}
+
+void FallbackICCodeCompiler::PushStubPayload(MacroAssembler& masm,
+ Register scratch) {
+ pushStubPayload(masm, scratch);
+ masm.adjustFrame(sizeof(intptr_t));
+}
+
+//
+// ToBool_Fallback
+//
+
+bool DoToBoolFallback(JSContext* cx, BaselineFrame* frame, ICFallbackStub* stub,
+ HandleValue arg, MutableHandleValue ret) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "ToBool");
+
+ TryAttachStub<ToBoolIRGenerator>("ToBool", cx, frame, stub, arg);
+
+ bool cond = ToBoolean(arg);
+ ret.setBoolean(cond);
+
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_ToBool() {
+ static_assert(R0 == JSReturnOperand);
+
+ // Restore the tail call register.
+ EmitRestoreTailCallReg(masm);
+
+ // Push arguments.
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ MutableHandleValue);
+ return tailCallVM<Fn, DoToBoolFallback>(masm);
+}
+
+//
+// GetElem_Fallback
+//
+
+bool DoGetElemFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue lhs, HandleValue rhs,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "GetElem");
+
+#ifdef DEBUG
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+ MOZ_ASSERT(JSOp(*pc) == JSOp::GetElem);
+#endif
+
+ TryAttachStub<GetPropIRGenerator>("GetElem", cx, frame, stub,
+ CacheKind::GetElem, lhs, rhs);
+
+ if (!GetElementOperation(cx, lhs, rhs, res)) {
+ return false;
+ }
+
+ return true;
+}
+
+bool DoGetElemSuperFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue lhs,
+ HandleValue rhs, HandleValue receiver,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+
+ JSOp op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "GetElemSuper(%s)", CodeName(op));
+
+ MOZ_ASSERT(op == JSOp::GetElemSuper);
+
+ // |lhs| is [[HomeObject]].[[Prototype]] which must be an Object or null.
+ MOZ_ASSERT(lhs.isObjectOrNull());
+
+ int lhsIndex = -1;
+ RootedObject lhsObj(
+ cx, ToObjectFromStackForPropertyAccess(cx, lhs, lhsIndex, rhs));
+ if (!lhsObj) {
+ return false;
+ }
+
+ TryAttachStub<GetPropIRGenerator>("GetElemSuper", cx, frame, stub,
+ CacheKind::GetElemSuper, lhs, rhs);
+
+ return GetObjectElementOperation(cx, op, lhsObj, receiver, rhs, res);
+}
+
+bool FallbackICCodeCompiler::emitGetElem(bool hasReceiver) {
+ static_assert(R0 == JSReturnOperand);
+
+ // Restore the tail call register.
+ EmitRestoreTailCallReg(masm);
+
+ // Super property getters use a |this| that differs from base object
+ if (hasReceiver) {
+ // State: receiver in R0, index in R1, obj on the stack
+
+ // Ensure stack is fully synced for the expression decompiler.
+ // We need: receiver, index, obj
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+ masm.pushValue(Address(masm.getStackPointer(), sizeof(Value) * 2));
+
+ // Push arguments.
+ masm.pushValue(R0); // Receiver
+ masm.pushValue(R1); // Index
+ masm.pushValue(Address(masm.getStackPointer(), sizeof(Value) * 5)); // Obj
+ masm.push(ICStubReg);
+ masm.pushBaselineFramePtr(FramePointer, R0.scratchReg());
+
+ using Fn =
+ bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ HandleValue, HandleValue, MutableHandleValue);
+ if (!tailCallVM<Fn, DoGetElemSuperFallback>(masm)) {
+ return false;
+ }
+ } else {
+ // Ensure stack is fully synced for the expression decompiler.
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+
+ // Push arguments.
+ masm.pushValue(R1);
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ masm.pushBaselineFramePtr(FramePointer, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*,
+ HandleValue, HandleValue, MutableHandleValue);
+ if (!tailCallVM<Fn, DoGetElemFallback>(masm)) {
+ return false;
+ }
+ }
+
+ // This is the resume point used when bailout rewrites call stack to undo
+ // Ion inlined frames. The return address pushed onto reconstructed stack
+ // will point here.
+ assumeStubFrame();
+ if (hasReceiver) {
+ code.initBailoutReturnOffset(BailoutReturnKind::GetElemSuper,
+ masm.currentOffset());
+ } else {
+ code.initBailoutReturnOffset(BailoutReturnKind::GetElem,
+ masm.currentOffset());
+ }
+
+ leaveStubFrame(masm);
+
+ EmitReturnFromIC(masm);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_GetElem() {
+ return emitGetElem(/* hasReceiver = */ false);
+}
+
+bool FallbackICCodeCompiler::emit_GetElemSuper() {
+ return emitGetElem(/* hasReceiver = */ true);
+}
+
+bool DoSetElemFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, Value* stack, HandleValue objv,
+ HandleValue index, HandleValue rhs) {
+ using DeferType = SetPropIRGenerator::DeferType;
+
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ RootedScript script(cx, frame->script());
+ RootedScript outerScript(cx, script);
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ JSOp op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "SetElem(%s)", CodeName(JSOp(*pc)));
+
+ MOZ_ASSERT(op == JSOp::SetElem || op == JSOp::StrictSetElem ||
+ op == JSOp::InitElem || op == JSOp::InitHiddenElem ||
+ op == JSOp::InitLockedElem || op == JSOp::InitElemInc);
+
+ int objvIndex = -3;
+ RootedObject obj(
+ cx, ToObjectFromStackForPropertyAccess(cx, objv, objvIndex, index));
+ if (!obj) {
+ return false;
+ }
+
+ Rooted<Shape*> oldShape(cx, obj->shape());
+
+ DeferType deferType = DeferType::None;
+ bool attached = false;
+
+ MaybeTransition(cx, frame, stub);
+
+ if (stub->state().canAttachStub()) {
+ ICScript* icScript = frame->icScript();
+ SetPropIRGenerator gen(cx, script, pc, CacheKind::SetElem, stub->state(),
+ objv, index, rhs);
+ switch (gen.tryAttachStub()) {
+ case AttachDecision::Attach: {
+ ICAttachResult result = AttachBaselineCacheIRStub(
+ cx, gen.writerRef(), gen.cacheKind(), frame->script(), icScript,
+ stub, gen.stubName());
+ if (result == ICAttachResult::Attached) {
+ attached = true;
+ JitSpew(JitSpew_BaselineIC, " Attached SetElem CacheIR stub");
+ }
+ } break;
+ case AttachDecision::NoAction:
+ break;
+ case AttachDecision::TemporarilyUnoptimizable:
+ attached = true;
+ break;
+ case AttachDecision::Deferred:
+ deferType = gen.deferType();
+ MOZ_ASSERT(deferType != DeferType::None);
+ break;
+ }
+ }
+
+ if (op == JSOp::InitElem || op == JSOp::InitHiddenElem ||
+ op == JSOp::InitLockedElem) {
+ if (!InitElemOperation(cx, pc, obj, index, rhs)) {
+ return false;
+ }
+ } else if (op == JSOp::InitElemInc) {
+ if (!InitElemIncOperation(cx, obj.as<ArrayObject>(), index.toInt32(),
+ rhs)) {
+ return false;
+ }
+ } else {
+ if (!SetObjectElementWithReceiver(cx, obj, index, rhs, objv,
+ JSOp(*pc) == JSOp::StrictSetElem)) {
+ return false;
+ }
+ }
+
+ // Overwrite the object on the stack (pushed for the decompiler) with the rhs.
+ MOZ_ASSERT(stack[2] == objv);
+ stack[2] = rhs;
+
+ if (attached) {
+ return true;
+ }
+
+ // The SetObjectElement call might have entered this IC recursively, so try
+ // to transition.
+ MaybeTransition(cx, frame, stub);
+
+ bool canAttachStub = stub->state().canAttachStub();
+
+ if (deferType != DeferType::None && canAttachStub) {
+ SetPropIRGenerator gen(cx, script, pc, CacheKind::SetElem, stub->state(),
+ objv, index, rhs);
+
+ MOZ_ASSERT(deferType == DeferType::AddSlot);
+ AttachDecision decision = gen.tryAttachAddSlotStub(oldShape);
+
+ switch (decision) {
+ case AttachDecision::Attach: {
+ ICScript* icScript = frame->icScript();
+ ICAttachResult result = AttachBaselineCacheIRStub(
+ cx, gen.writerRef(), gen.cacheKind(), frame->script(), icScript,
+ stub, gen.stubName());
+ if (result == ICAttachResult::Attached) {
+ attached = true;
+ JitSpew(JitSpew_BaselineIC, " Attached SetElem CacheIR stub");
+ }
+ } break;
+ case AttachDecision::NoAction:
+ gen.trackAttached(IRGenerator::NotAttached);
+ break;
+ case AttachDecision::TemporarilyUnoptimizable:
+ case AttachDecision::Deferred:
+ MOZ_ASSERT_UNREACHABLE("Invalid attach result");
+ break;
+ }
+ }
+ if (!attached && canAttachStub) {
+ stub->trackNotAttached();
+ }
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_SetElem() {
+ static_assert(R0 == JSReturnOperand);
+
+ EmitRestoreTailCallReg(masm);
+
+ // State: R0: object, R1: index, stack: rhs.
+ // For the decompiler, the stack has to be: object, index, rhs,
+ // so we push the index, then overwrite the rhs Value with R0
+ // and push the rhs value.
+ masm.pushValue(R1);
+ masm.loadValue(Address(masm.getStackPointer(), sizeof(Value)), R1);
+ masm.storeValue(R0, Address(masm.getStackPointer(), sizeof(Value)));
+ masm.pushValue(R1);
+
+ // Push arguments.
+ masm.pushValue(R1); // RHS
+
+ // Push index. On x86 and ARM two push instructions are emitted so use a
+ // separate register to store the old stack pointer.
+ masm.moveStackPtrTo(R1.scratchReg());
+ masm.pushValue(Address(R1.scratchReg(), 2 * sizeof(Value)));
+ masm.pushValue(R0); // Object.
+
+ // Push pointer to stack values, so that the stub can overwrite the object
+ // (pushed for the decompiler) with the rhs.
+ masm.computeEffectiveAddress(
+ Address(masm.getStackPointer(), 3 * sizeof(Value)), R0.scratchReg());
+ masm.push(R0.scratchReg());
+
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, Value*,
+ HandleValue, HandleValue, HandleValue);
+ return tailCallVM<Fn, DoSetElemFallback>(masm);
+}
+
+//
+// In_Fallback
+//
+
+bool DoInFallback(JSContext* cx, BaselineFrame* frame, ICFallbackStub* stub,
+ HandleValue key, HandleValue objValue,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "In");
+
+ if (!objValue.isObject()) {
+ ReportInNotObjectError(cx, key, objValue);
+ return false;
+ }
+
+ TryAttachStub<HasPropIRGenerator>("In", cx, frame, stub, CacheKind::In, key,
+ objValue);
+
+ RootedObject obj(cx, &objValue.toObject());
+ bool cond = false;
+ if (!OperatorIn(cx, key, obj, &cond)) {
+ return false;
+ }
+ res.setBoolean(cond);
+
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_In() {
+ EmitRestoreTailCallReg(masm);
+
+ // Sync for the decompiler.
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+
+ // Push arguments.
+ masm.pushValue(R1);
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ HandleValue, MutableHandleValue);
+ return tailCallVM<Fn, DoInFallback>(masm);
+}
+
+//
+// HasOwn_Fallback
+//
+
+bool DoHasOwnFallback(JSContext* cx, BaselineFrame* frame, ICFallbackStub* stub,
+ HandleValue keyValue, HandleValue objValue,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "HasOwn");
+
+ TryAttachStub<HasPropIRGenerator>("HasOwn", cx, frame, stub,
+ CacheKind::HasOwn, keyValue, objValue);
+
+ bool found;
+ if (!HasOwnProperty(cx, objValue, keyValue, &found)) {
+ return false;
+ }
+
+ res.setBoolean(found);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_HasOwn() {
+ EmitRestoreTailCallReg(masm);
+
+ // Sync for the decompiler.
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+
+ // Push arguments.
+ masm.pushValue(R1);
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ HandleValue, MutableHandleValue);
+ return tailCallVM<Fn, DoHasOwnFallback>(masm);
+}
+
+//
+// CheckPrivate_Fallback
+//
+
+bool DoCheckPrivateFieldFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue objValue,
+ HandleValue keyValue, MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+
+ FallbackICSpew(cx, stub, "CheckPrivateField");
+
+ MOZ_ASSERT(keyValue.isSymbol() && keyValue.toSymbol()->isPrivateName());
+
+ TryAttachStub<CheckPrivateFieldIRGenerator>("CheckPrivate", cx, frame, stub,
+ CacheKind::CheckPrivateField,
+ keyValue, objValue);
+
+ bool result;
+ if (!CheckPrivateFieldOperation(cx, pc, objValue, keyValue, &result)) {
+ return false;
+ }
+
+ res.setBoolean(result);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_CheckPrivateField() {
+ EmitRestoreTailCallReg(masm);
+
+ // Sync for the decompiler.
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+
+ // Push arguments.
+ masm.pushValue(R1);
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ HandleValue, MutableHandleValue);
+ return tailCallVM<Fn, DoCheckPrivateFieldFallback>(masm);
+}
+
+//
+// GetName_Fallback
+//
+
+bool DoGetNameFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleObject envChain,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ RootedScript script(cx, frame->script());
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ mozilla::DebugOnly<JSOp> op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "GetName(%s)", CodeName(JSOp(*pc)));
+
+ MOZ_ASSERT(op == JSOp::GetName || op == JSOp::GetGName);
+
+ Rooted<PropertyName*> name(cx, script->getName(pc));
+
+ TryAttachStub<GetNameIRGenerator>("GetName", cx, frame, stub, envChain, name);
+
+ static_assert(JSOpLength_GetGName == JSOpLength_GetName,
+ "Otherwise our check for JSOp::Typeof isn't ok");
+ if (JSOp(pc[JSOpLength_GetGName]) == JSOp::Typeof) {
+ if (!GetEnvironmentName<GetNameMode::TypeOf>(cx, envChain, name, res)) {
+ return false;
+ }
+ } else {
+ if (!GetEnvironmentName<GetNameMode::Normal>(cx, envChain, name, res)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_GetName() {
+ static_assert(R0 == JSReturnOperand);
+
+ EmitRestoreTailCallReg(masm);
+
+ masm.push(R0.scratchReg());
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleObject,
+ MutableHandleValue);
+ return tailCallVM<Fn, DoGetNameFallback>(masm);
+}
+
+//
+// BindName_Fallback
+//
+
+bool DoBindNameFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleObject envChain,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+ mozilla::DebugOnly<JSOp> op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "BindName(%s)", CodeName(JSOp(*pc)));
+
+ MOZ_ASSERT(op == JSOp::BindName || op == JSOp::BindGName);
+
+ Rooted<PropertyName*> name(cx, frame->script()->getName(pc));
+
+ TryAttachStub<BindNameIRGenerator>("BindName", cx, frame, stub, envChain,
+ name);
+
+ RootedObject scope(cx);
+ if (!LookupNameUnqualified(cx, name, envChain, &scope)) {
+ return false;
+ }
+
+ res.setObject(*scope);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_BindName() {
+ static_assert(R0 == JSReturnOperand);
+
+ EmitRestoreTailCallReg(masm);
+
+ masm.push(R0.scratchReg());
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleObject,
+ MutableHandleValue);
+ return tailCallVM<Fn, DoBindNameFallback>(masm);
+}
+
+//
+// GetIntrinsic_Fallback
+//
+
+bool DoGetIntrinsicFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ RootedScript script(cx, frame->script());
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ mozilla::DebugOnly<JSOp> op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "GetIntrinsic(%s)", CodeName(JSOp(*pc)));
+
+ MOZ_ASSERT(op == JSOp::GetIntrinsic);
+
+ if (!GetIntrinsicOperation(cx, script, pc, res)) {
+ return false;
+ }
+
+ TryAttachStub<GetIntrinsicIRGenerator>("GetIntrinsic", cx, frame, stub, res);
+
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_GetIntrinsic() {
+ EmitRestoreTailCallReg(masm);
+
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn =
+ bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, MutableHandleValue);
+ return tailCallVM<Fn, DoGetIntrinsicFallback>(masm);
+}
+
+//
+// GetProp_Fallback
+//
+
+bool DoGetPropFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, MutableHandleValue val,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ RootedScript script(cx, frame->script());
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ JSOp op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "GetProp(%s)", CodeName(op));
+
+ MOZ_ASSERT(op == JSOp::GetProp || op == JSOp::GetBoundName);
+
+ Rooted<PropertyName*> name(cx, script->getName(pc));
+ RootedValue idVal(cx, StringValue(name));
+
+ TryAttachStub<GetPropIRGenerator>("GetProp", cx, frame, stub,
+ CacheKind::GetProp, val, idVal);
+
+ if (op == JSOp::GetBoundName) {
+ RootedObject env(cx, &val.toObject());
+ RootedId id(cx, NameToId(name));
+ return GetNameBoundInEnvironment(cx, env, id, res);
+ }
+
+ MOZ_ASSERT(op == JSOp::GetProp);
+ if (!GetProperty(cx, val, name, res)) {
+ return false;
+ }
+
+ return true;
+}
+
+bool DoGetPropSuperFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue receiver,
+ MutableHandleValue val, MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ RootedScript script(cx, frame->script());
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ FallbackICSpew(cx, stub, "GetPropSuper(%s)", CodeName(JSOp(*pc)));
+
+ MOZ_ASSERT(JSOp(*pc) == JSOp::GetPropSuper);
+
+ Rooted<PropertyName*> name(cx, script->getName(pc));
+ RootedValue idVal(cx, StringValue(name));
+
+ // |val| is [[HomeObject]].[[Prototype]] which must be an Object or null.
+ MOZ_ASSERT(val.isObjectOrNull());
+
+ int valIndex = -1;
+ RootedObject valObj(
+ cx, ToObjectFromStackForPropertyAccess(cx, val, valIndex, name));
+ if (!valObj) {
+ return false;
+ }
+
+ TryAttachStub<GetPropIRGenerator>("GetPropSuper", cx, frame, stub,
+ CacheKind::GetPropSuper, val, idVal);
+
+ if (!GetProperty(cx, valObj, receiver, name, res)) {
+ return false;
+ }
+
+ return true;
+}
+
+bool FallbackICCodeCompiler::emitGetProp(bool hasReceiver) {
+ static_assert(R0 == JSReturnOperand);
+
+ EmitRestoreTailCallReg(masm);
+
+ // Super property getters use a |this| that differs from base object
+ if (hasReceiver) {
+ // Push arguments.
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+ masm.push(ICStubReg);
+ masm.pushBaselineFramePtr(FramePointer, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*,
+ HandleValue, MutableHandleValue, MutableHandleValue);
+ if (!tailCallVM<Fn, DoGetPropSuperFallback>(masm)) {
+ return false;
+ }
+ } else {
+ // Ensure stack is fully synced for the expression decompiler.
+ masm.pushValue(R0);
+
+ // Push arguments.
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ masm.pushBaselineFramePtr(FramePointer, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*,
+ MutableHandleValue, MutableHandleValue);
+ if (!tailCallVM<Fn, DoGetPropFallback>(masm)) {
+ return false;
+ }
+ }
+
+ // This is the resume point used when bailout rewrites call stack to undo
+ // Ion inlined frames. The return address pushed onto reconstructed stack
+ // will point here.
+ assumeStubFrame();
+ if (hasReceiver) {
+ code.initBailoutReturnOffset(BailoutReturnKind::GetPropSuper,
+ masm.currentOffset());
+ } else {
+ code.initBailoutReturnOffset(BailoutReturnKind::GetProp,
+ masm.currentOffset());
+ }
+
+ leaveStubFrame(masm);
+
+ EmitReturnFromIC(masm);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_GetProp() {
+ return emitGetProp(/* hasReceiver = */ false);
+}
+
+bool FallbackICCodeCompiler::emit_GetPropSuper() {
+ return emitGetProp(/* hasReceiver = */ true);
+}
+
+//
+// SetProp_Fallback
+//
+
+bool DoSetPropFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, Value* stack, HandleValue lhs,
+ HandleValue rhs) {
+ using DeferType = SetPropIRGenerator::DeferType;
+
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ RootedScript script(cx, frame->script());
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ JSOp op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "SetProp(%s)", CodeName(op));
+
+ MOZ_ASSERT(op == JSOp::SetProp || op == JSOp::StrictSetProp ||
+ op == JSOp::SetName || op == JSOp::StrictSetName ||
+ op == JSOp::SetGName || op == JSOp::StrictSetGName ||
+ op == JSOp::InitProp || op == JSOp::InitLockedProp ||
+ op == JSOp::InitHiddenProp || op == JSOp::InitGLexical);
+
+ Rooted<PropertyName*> name(cx, script->getName(pc));
+ RootedId id(cx, NameToId(name));
+
+ int lhsIndex = -2;
+ RootedObject obj(cx,
+ ToObjectFromStackForPropertyAccess(cx, lhs, lhsIndex, id));
+ if (!obj) {
+ return false;
+ }
+ Rooted<Shape*> oldShape(cx, obj->shape());
+
+ DeferType deferType = DeferType::None;
+ bool attached = false;
+ MaybeTransition(cx, frame, stub);
+
+ if (stub->state().canAttachStub()) {
+ RootedValue idVal(cx, StringValue(name));
+ SetPropIRGenerator gen(cx, script, pc, CacheKind::SetProp, stub->state(),
+ lhs, idVal, rhs);
+ switch (gen.tryAttachStub()) {
+ case AttachDecision::Attach: {
+ ICScript* icScript = frame->icScript();
+ ICAttachResult result = AttachBaselineCacheIRStub(
+ cx, gen.writerRef(), gen.cacheKind(), frame->script(), icScript,
+ stub, gen.stubName());
+ if (result == ICAttachResult::Attached) {
+ attached = true;
+ JitSpew(JitSpew_BaselineIC, " Attached SetProp CacheIR stub");
+ }
+ } break;
+ case AttachDecision::NoAction:
+ break;
+ case AttachDecision::TemporarilyUnoptimizable:
+ attached = true;
+ break;
+ case AttachDecision::Deferred:
+ deferType = gen.deferType();
+ MOZ_ASSERT(deferType != DeferType::None);
+ break;
+ }
+ }
+
+ if (op == JSOp::InitProp || op == JSOp::InitLockedProp ||
+ op == JSOp::InitHiddenProp) {
+ if (!InitPropertyOperation(cx, pc, obj, name, rhs)) {
+ return false;
+ }
+ } else if (op == JSOp::SetName || op == JSOp::StrictSetName ||
+ op == JSOp::SetGName || op == JSOp::StrictSetGName) {
+ if (!SetNameOperation(cx, script, pc, obj, rhs)) {
+ return false;
+ }
+ } else if (op == JSOp::InitGLexical) {
+ ExtensibleLexicalEnvironmentObject* lexicalEnv;
+ if (script->hasNonSyntacticScope()) {
+ lexicalEnv = &NearestEnclosingExtensibleLexicalEnvironment(
+ frame->environmentChain());
+ } else {
+ lexicalEnv = &cx->global()->lexicalEnvironment();
+ }
+ InitGlobalLexicalOperation(cx, lexicalEnv, script, pc, rhs);
+ } else {
+ MOZ_ASSERT(op == JSOp::SetProp || op == JSOp::StrictSetProp);
+
+ ObjectOpResult result;
+ if (!SetProperty(cx, obj, id, rhs, lhs, result) ||
+ !result.checkStrictModeError(cx, obj, id, op == JSOp::StrictSetProp)) {
+ return false;
+ }
+ }
+
+ // Overwrite the LHS on the stack (pushed for the decompiler) with the RHS.
+ MOZ_ASSERT(stack[1] == lhs);
+ stack[1] = rhs;
+
+ if (attached) {
+ return true;
+ }
+
+ // The SetProperty call might have entered this IC recursively, so try
+ // to transition.
+ MaybeTransition(cx, frame, stub);
+
+ bool canAttachStub = stub->state().canAttachStub();
+
+ if (deferType != DeferType::None && canAttachStub) {
+ RootedValue idVal(cx, StringValue(name));
+ SetPropIRGenerator gen(cx, script, pc, CacheKind::SetProp, stub->state(),
+ lhs, idVal, rhs);
+
+ MOZ_ASSERT(deferType == DeferType::AddSlot);
+ AttachDecision decision = gen.tryAttachAddSlotStub(oldShape);
+
+ switch (decision) {
+ case AttachDecision::Attach: {
+ ICScript* icScript = frame->icScript();
+ ICAttachResult result = AttachBaselineCacheIRStub(
+ cx, gen.writerRef(), gen.cacheKind(), frame->script(), icScript,
+ stub, gen.stubName());
+ if (result == ICAttachResult::Attached) {
+ attached = true;
+ JitSpew(JitSpew_BaselineIC, " Attached SetElem CacheIR stub");
+ }
+ } break;
+ case AttachDecision::NoAction:
+ gen.trackAttached(IRGenerator::NotAttached);
+ break;
+ case AttachDecision::TemporarilyUnoptimizable:
+ case AttachDecision::Deferred:
+ MOZ_ASSERT_UNREACHABLE("Invalid attach result");
+ break;
+ }
+ }
+ if (!attached && canAttachStub) {
+ stub->trackNotAttached();
+ }
+
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_SetProp() {
+ static_assert(R0 == JSReturnOperand);
+
+ EmitRestoreTailCallReg(masm);
+
+ // Ensure stack is fully synced for the expression decompiler.
+ // Overwrite the RHS value on top of the stack with the object, then push
+ // the RHS in R1 on top of that.
+ masm.storeValue(R0, Address(masm.getStackPointer(), 0));
+ masm.pushValue(R1);
+
+ // Push arguments.
+ masm.pushValue(R1);
+ masm.pushValue(R0);
+
+ // Push pointer to stack values, so that the stub can overwrite the object
+ // (pushed for the decompiler) with the RHS.
+ masm.computeEffectiveAddress(
+ Address(masm.getStackPointer(), 2 * sizeof(Value)), R0.scratchReg());
+ masm.push(R0.scratchReg());
+
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, Value*,
+ HandleValue, HandleValue);
+ if (!tailCallVM<Fn, DoSetPropFallback>(masm)) {
+ return false;
+ }
+
+ // This is the resume point used when bailout rewrites call stack to undo
+ // Ion inlined frames. The return address pushed onto reconstructed stack
+ // will point here.
+ assumeStubFrame();
+ code.initBailoutReturnOffset(BailoutReturnKind::SetProp,
+ masm.currentOffset());
+
+ leaveStubFrame(masm);
+ EmitReturnFromIC(masm);
+
+ return true;
+}
+
+//
+// Call_Fallback
+//
+
+bool DoCallFallback(JSContext* cx, BaselineFrame* frame, ICFallbackStub* stub,
+ uint32_t argc, Value* vp, MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ RootedScript script(cx, frame->script());
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ JSOp op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "Call(%s)", CodeName(op));
+
+ MOZ_ASSERT(argc == GET_ARGC(pc));
+ bool constructing =
+ (op == JSOp::New || op == JSOp::NewContent || op == JSOp::SuperCall);
+ bool ignoresReturnValue = (op == JSOp::CallIgnoresRv);
+
+ // Ensure vp array is rooted - we may GC in here.
+ size_t numValues = argc + 2 + constructing;
+ RootedExternalValueArray vpRoot(cx, numValues, vp);
+
+ CallArgs callArgs = CallArgsFromSp(argc + constructing, vp + numValues,
+ constructing, ignoresReturnValue);
+ RootedValue callee(cx, vp[0]);
+ RootedValue newTarget(cx, constructing ? callArgs.newTarget() : NullValue());
+
+ // Transition stub state to megamorphic or generic if warranted.
+ MaybeTransition(cx, frame, stub);
+
+ bool canAttachStub = stub->state().canAttachStub();
+ bool handled = false;
+
+ // Only bother to try optimizing JSOp::Call with CacheIR if the chain is still
+ // allowed to attach stubs.
+ if (canAttachStub) {
+ HandleValueArray args = HandleValueArray::fromMarkedLocation(argc, vp + 2);
+ CallIRGenerator gen(cx, script, pc, op, stub->state(), argc, callee,
+ callArgs.thisv(), newTarget, args);
+ switch (gen.tryAttachStub()) {
+ case AttachDecision::NoAction:
+ break;
+ case AttachDecision::Attach: {
+ ICScript* icScript = frame->icScript();
+ ICAttachResult result =
+ AttachBaselineCacheIRStub(cx, gen.writerRef(), gen.cacheKind(),
+ script, icScript, stub, gen.stubName());
+ if (result == ICAttachResult::Attached) {
+ handled = true;
+ JitSpew(JitSpew_BaselineIC, " Attached Call CacheIR stub");
+ }
+ } break;
+ case AttachDecision::TemporarilyUnoptimizable:
+ handled = true;
+ break;
+ case AttachDecision::Deferred:
+ MOZ_CRASH("No deferred Call stubs");
+ }
+ if (!handled) {
+ stub->trackNotAttached();
+ }
+ }
+
+ if (constructing) {
+ if (!ConstructFromStack(cx, callArgs)) {
+ return false;
+ }
+ res.set(callArgs.rval());
+ } else if ((op == JSOp::Eval || op == JSOp::StrictEval) &&
+ cx->global()->valueIsEval(callee)) {
+ if (!DirectEval(cx, callArgs.get(0), res)) {
+ return false;
+ }
+ } else {
+ MOZ_ASSERT(op == JSOp::Call || op == JSOp::CallContent ||
+ op == JSOp::CallIgnoresRv || op == JSOp::CallIter ||
+ op == JSOp::CallContentIter || op == JSOp::Eval ||
+ op == JSOp::StrictEval);
+ if ((op == JSOp::CallIter || op == JSOp::CallContentIter) &&
+ callee.isPrimitive()) {
+ MOZ_ASSERT(argc == 0, "thisv must be on top of the stack");
+ ReportValueError(cx, JSMSG_NOT_ITERABLE, -1, callArgs.thisv(), nullptr);
+ return false;
+ }
+
+ if (!CallFromStack(cx, callArgs)) {
+ return false;
+ }
+
+ res.set(callArgs.rval());
+ }
+
+ return true;
+}
+
+bool DoSpreadCallFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, Value* vp,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ RootedScript script(cx, frame->script());
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+ JSOp op = JSOp(*pc);
+ bool constructing = (op == JSOp::SpreadNew || op == JSOp::SpreadSuperCall);
+ FallbackICSpew(cx, stub, "SpreadCall(%s)", CodeName(op));
+
+ // Ensure vp array is rooted - we may GC in here.
+ RootedExternalValueArray vpRoot(cx, 3 + constructing, vp);
+
+ RootedValue callee(cx, vp[0]);
+ RootedValue thisv(cx, vp[1]);
+ RootedValue arr(cx, vp[2]);
+ RootedValue newTarget(cx, constructing ? vp[3] : NullValue());
+
+ // Transition stub state to megamorphic or generic if warranted.
+ MaybeTransition(cx, frame, stub);
+
+ // Try attaching a call stub.
+ bool handled = false;
+ if (op != JSOp::SpreadEval && op != JSOp::StrictSpreadEval &&
+ stub->state().canAttachStub()) {
+ // Try CacheIR first:
+ Rooted<ArrayObject*> aobj(cx, &arr.toObject().as<ArrayObject>());
+ MOZ_ASSERT(IsPackedArray(aobj));
+
+ HandleValueArray args = HandleValueArray::fromMarkedLocation(
+ aobj->length(), aobj->getDenseElements());
+ CallIRGenerator gen(cx, script, pc, op, stub->state(), 1, callee, thisv,
+ newTarget, args);
+ switch (gen.tryAttachStub()) {
+ case AttachDecision::NoAction:
+ break;
+ case AttachDecision::Attach: {
+ ICScript* icScript = frame->icScript();
+ ICAttachResult result =
+ AttachBaselineCacheIRStub(cx, gen.writerRef(), gen.cacheKind(),
+ script, icScript, stub, gen.stubName());
+
+ if (result == ICAttachResult::Attached) {
+ handled = true;
+ JitSpew(JitSpew_BaselineIC, " Attached Spread Call CacheIR stub");
+ }
+ } break;
+ case AttachDecision::TemporarilyUnoptimizable:
+ handled = true;
+ break;
+ case AttachDecision::Deferred:
+ MOZ_ASSERT_UNREACHABLE("No deferred optimizations for spread calls");
+ break;
+ }
+ if (!handled) {
+ stub->trackNotAttached();
+ }
+ }
+
+ return SpreadCallOperation(cx, script, pc, thisv, callee, arr, newTarget,
+ res);
+}
+
+void FallbackICCodeCompiler::pushCallArguments(
+ MacroAssembler& masm, AllocatableGeneralRegisterSet regs, Register argcReg,
+ bool isConstructing) {
+ MOZ_ASSERT(!regs.has(argcReg));
+
+ // argPtr initially points to the last argument.
+ Register argPtr = regs.takeAny();
+ masm.mov(FramePointer, argPtr);
+
+ // Skip 3 pointers pushed on top of the arguments: the frame descriptor,
+ // return address, and old frame pointer.
+ size_t valueOffset = BaselineStubFrameLayout::Size();
+
+ // We have to push |this|, callee, new.target (if constructing) and argc
+ // arguments. Handle the number of Values we know statically first.
+
+ size_t numNonArgValues = 2 + isConstructing;
+ for (size_t i = 0; i < numNonArgValues; i++) {
+ masm.pushValue(Address(argPtr, valueOffset));
+ valueOffset += sizeof(Value);
+ }
+
+ // If there are no arguments we're done.
+ Label done;
+ masm.branchTest32(Assembler::Zero, argcReg, argcReg, &done);
+
+ // Push argc Values.
+ Label loop;
+ Register count = regs.takeAny();
+ masm.addPtr(Imm32(valueOffset), argPtr);
+ masm.move32(argcReg, count);
+ masm.bind(&loop);
+ {
+ masm.pushValue(Address(argPtr, 0));
+ masm.addPtr(Imm32(sizeof(Value)), argPtr);
+
+ masm.branchSub32(Assembler::NonZero, Imm32(1), count, &loop);
+ }
+ masm.bind(&done);
+}
+
+bool FallbackICCodeCompiler::emitCall(bool isSpread, bool isConstructing) {
+ static_assert(R0 == JSReturnOperand);
+
+ // Values are on the stack left-to-right. Calling convention wants them
+ // right-to-left so duplicate them on the stack in reverse order.
+ // |this| and callee are pushed last.
+
+ AllocatableGeneralRegisterSet regs = BaselineICAvailableGeneralRegs(0);
+
+ if (MOZ_UNLIKELY(isSpread)) {
+ // Push a stub frame so that we can perform a non-tail call.
+ enterStubFrame(masm, R1.scratchReg());
+
+ // Use FramePointer instead of StackPointer because it's not affected by
+ // the stack pushes below.
+
+ // newTarget
+ uint32_t valueOffset = BaselineStubFrameLayout::Size();
+ if (isConstructing) {
+ masm.pushValue(Address(FramePointer, valueOffset));
+ valueOffset += sizeof(Value);
+ }
+
+ // array
+ masm.pushValue(Address(FramePointer, valueOffset));
+ valueOffset += sizeof(Value);
+
+ // this
+ masm.pushValue(Address(FramePointer, valueOffset));
+ valueOffset += sizeof(Value);
+
+ // callee
+ masm.pushValue(Address(FramePointer, valueOffset));
+ valueOffset += sizeof(Value);
+
+ masm.push(masm.getStackPointer());
+ masm.push(ICStubReg);
+
+ PushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, Value*,
+ MutableHandleValue);
+ if (!callVM<Fn, DoSpreadCallFallback>(masm)) {
+ return false;
+ }
+
+ leaveStubFrame(masm);
+ EmitReturnFromIC(masm);
+
+ // SpreadCall is not yet supported in Ion, so do not generate asmcode for
+ // bailout.
+ return true;
+ }
+
+ // Push a stub frame so that we can perform a non-tail call.
+ enterStubFrame(masm, R1.scratchReg());
+
+ regs.take(R0.scratchReg()); // argc.
+
+ pushCallArguments(masm, regs, R0.scratchReg(), isConstructing);
+
+ masm.push(masm.getStackPointer());
+ masm.push(R0.scratchReg());
+ masm.push(ICStubReg);
+
+ PushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, uint32_t,
+ Value*, MutableHandleValue);
+ if (!callVM<Fn, DoCallFallback>(masm)) {
+ return false;
+ }
+
+ leaveStubFrame(masm);
+ EmitReturnFromIC(masm);
+
+ // This is the resume point used when bailout rewrites call stack to undo
+ // Ion inlined frames. The return address pushed onto reconstructed stack
+ // will point here.
+ assumeStubFrame();
+
+ MOZ_ASSERT(!isSpread);
+
+ if (isConstructing) {
+ code.initBailoutReturnOffset(BailoutReturnKind::New, masm.currentOffset());
+ } else {
+ code.initBailoutReturnOffset(BailoutReturnKind::Call, masm.currentOffset());
+ }
+
+ // Load passed-in ThisV into R1 just in case it's needed. Need to do this
+ // before we leave the stub frame since that info will be lost.
+ // Current stack: [...., ThisV, CalleeToken, Descriptor ]
+ size_t thisvOffset =
+ JitFrameLayout::offsetOfThis() - JitFrameLayout::bytesPoppedAfterCall();
+ masm.loadValue(Address(masm.getStackPointer(), thisvOffset), R1);
+
+ leaveStubFrame(masm);
+
+ // If this is a |constructing| call, if the callee returns a non-object, we
+ // replace it with the |this| object passed in.
+ if (isConstructing) {
+ static_assert(JSReturnOperand == R0);
+ Label skipThisReplace;
+
+ masm.branchTestObject(Assembler::Equal, JSReturnOperand, &skipThisReplace);
+ masm.moveValue(R1, R0);
+#ifdef DEBUG
+ masm.branchTestObject(Assembler::Equal, JSReturnOperand, &skipThisReplace);
+ masm.assumeUnreachable("Failed to return object in constructing call.");
+#endif
+ masm.bind(&skipThisReplace);
+ }
+
+ EmitReturnFromIC(masm);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_Call() {
+ return emitCall(/* isSpread = */ false, /* isConstructing = */ false);
+}
+
+bool FallbackICCodeCompiler::emit_CallConstructing() {
+ return emitCall(/* isSpread = */ false, /* isConstructing = */ true);
+}
+
+bool FallbackICCodeCompiler::emit_SpreadCall() {
+ return emitCall(/* isSpread = */ true, /* isConstructing = */ false);
+}
+
+bool FallbackICCodeCompiler::emit_SpreadCallConstructing() {
+ return emitCall(/* isSpread = */ true, /* isConstructing = */ true);
+}
+
+//
+// GetIterator_Fallback
+//
+
+bool DoGetIteratorFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue value,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "GetIterator");
+
+ TryAttachStub<GetIteratorIRGenerator>("GetIterator", cx, frame, stub, value);
+
+ PropertyIteratorObject* iterObj = ValueToIterator(cx, value);
+ if (!iterObj) {
+ return false;
+ }
+
+ res.setObject(*iterObj);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_GetIterator() {
+ EmitRestoreTailCallReg(masm);
+
+ // Sync stack for the decompiler.
+ masm.pushValue(R0);
+
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ MutableHandleValue);
+ return tailCallVM<Fn, DoGetIteratorFallback>(masm);
+}
+
+//
+// OptimizeSpreadCall_Fallback
+//
+
+bool DoOptimizeSpreadCallFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue value,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "OptimizeSpreadCall");
+
+ TryAttachStub<OptimizeSpreadCallIRGenerator>("OptimizeSpreadCall", cx, frame,
+ stub, value);
+
+ return OptimizeSpreadCall(cx, value, res);
+}
+
+bool FallbackICCodeCompiler::emit_OptimizeSpreadCall() {
+ EmitRestoreTailCallReg(masm);
+
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ MutableHandleValue);
+ return tailCallVM<Fn, DoOptimizeSpreadCallFallback>(masm);
+}
+
+//
+// InstanceOf_Fallback
+//
+
+bool DoInstanceOfFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue lhs,
+ HandleValue rhs, MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "InstanceOf");
+
+ if (!rhs.isObject()) {
+ ReportValueError(cx, JSMSG_BAD_INSTANCEOF_RHS, -1, rhs, nullptr);
+ return false;
+ }
+
+ RootedObject obj(cx, &rhs.toObject());
+ bool cond = false;
+ if (!InstanceofOperator(cx, obj, lhs, &cond)) {
+ return false;
+ }
+
+ res.setBoolean(cond);
+
+ if (!obj->is<JSFunction>()) {
+ // ensure we've recorded at least one failure, so we can detect there was a
+ // non-optimizable case
+ if (!stub->state().hasFailures()) {
+ stub->trackNotAttached();
+ }
+ return true;
+ }
+
+ TryAttachStub<InstanceOfIRGenerator>("InstanceOf", cx, frame, stub, lhs, obj);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_InstanceOf() {
+ EmitRestoreTailCallReg(masm);
+
+ // Sync stack for the decompiler.
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+
+ masm.pushValue(R1);
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ HandleValue, MutableHandleValue);
+ return tailCallVM<Fn, DoInstanceOfFallback>(masm);
+}
+
+//
+// TypeOf_Fallback
+//
+
+bool DoTypeOfFallback(JSContext* cx, BaselineFrame* frame, ICFallbackStub* stub,
+ HandleValue val, MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "TypeOf");
+
+ TryAttachStub<TypeOfIRGenerator>("TypeOf", cx, frame, stub, val);
+
+ JSType type = js::TypeOfValue(val);
+ RootedString string(cx, TypeName(type, cx->names()));
+ res.setString(string);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_TypeOf() {
+ EmitRestoreTailCallReg(masm);
+
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ MutableHandleValue);
+ return tailCallVM<Fn, DoTypeOfFallback>(masm);
+}
+
+//
+// ToPropertyKey_Fallback
+//
+
+bool DoToPropertyKeyFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue val,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "ToPropertyKey");
+
+ TryAttachStub<ToPropertyKeyIRGenerator>("ToPropertyKey", cx, frame, stub,
+ val);
+
+ return ToPropertyKeyOperation(cx, val, res);
+}
+
+bool FallbackICCodeCompiler::emit_ToPropertyKey() {
+ EmitRestoreTailCallReg(masm);
+
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ MutableHandleValue);
+ return tailCallVM<Fn, DoToPropertyKeyFallback>(masm);
+}
+
+//
+// Rest_Fallback
+//
+
+bool DoRestFallback(JSContext* cx, BaselineFrame* frame, ICFallbackStub* stub,
+ MutableHandleValue res) {
+ unsigned numFormals = frame->numFormalArgs() - 1;
+ unsigned numActuals = frame->numActualArgs();
+ unsigned numRest = numActuals > numFormals ? numActuals - numFormals : 0;
+ Value* rest = frame->argv() + numFormals;
+
+ ArrayObject* obj = NewDenseCopiedArray(cx, numRest, rest);
+ if (!obj) {
+ return false;
+ }
+ res.setObject(*obj);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_Rest() {
+ EmitRestoreTailCallReg(masm);
+
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn =
+ bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, MutableHandleValue);
+ return tailCallVM<Fn, DoRestFallback>(masm);
+}
+
+//
+// UnaryArith_Fallback
+//
+
+bool DoUnaryArithFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue val,
+ MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+ JSOp op = JSOp(*pc);
+ FallbackICSpew(cx, stub, "UnaryArith(%s)", CodeName(op));
+
+ switch (op) {
+ case JSOp::BitNot: {
+ res.set(val);
+ if (!BitNot(cx, res, res)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::Pos: {
+ res.set(val);
+ if (!ToNumber(cx, res)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::Neg: {
+ res.set(val);
+ if (!NegOperation(cx, res, res)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::Inc: {
+ if (!IncOperation(cx, val, res)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::Dec: {
+ if (!DecOperation(cx, val, res)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::ToNumeric: {
+ res.set(val);
+ if (!ToNumeric(cx, res)) {
+ return false;
+ }
+ break;
+ }
+ default:
+ MOZ_CRASH("Unexpected op");
+ }
+ MOZ_ASSERT(res.isNumeric());
+
+ TryAttachStub<UnaryArithIRGenerator>("UnaryArith", cx, frame, stub, op, val,
+ res);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_UnaryArith() {
+ static_assert(R0 == JSReturnOperand);
+
+ // Restore the tail call register.
+ EmitRestoreTailCallReg(masm);
+
+ // Ensure stack is fully synced for the expression decompiler.
+ masm.pushValue(R0);
+
+ // Push arguments.
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ MutableHandleValue);
+ return tailCallVM<Fn, DoUnaryArithFallback>(masm);
+}
+
+//
+// BinaryArith_Fallback
+//
+
+bool DoBinaryArithFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue lhs,
+ HandleValue rhs, MutableHandleValue ret) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+ JSOp op = JSOp(*pc);
+ FallbackICSpew(
+ cx, stub, "CacheIRBinaryArith(%s,%d,%d)", CodeName(op),
+ int(lhs.isDouble() ? JSVAL_TYPE_DOUBLE : lhs.extractNonDoubleType()),
+ int(rhs.isDouble() ? JSVAL_TYPE_DOUBLE : rhs.extractNonDoubleType()));
+
+ // Don't pass lhs/rhs directly, we need the original values when
+ // generating stubs.
+ RootedValue lhsCopy(cx, lhs);
+ RootedValue rhsCopy(cx, rhs);
+
+ // Perform the arith operation.
+ switch (op) {
+ case JSOp::Add:
+ // Do an add.
+ if (!AddValues(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ case JSOp::Sub:
+ if (!SubValues(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ case JSOp::Mul:
+ if (!MulValues(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ case JSOp::Div:
+ if (!DivValues(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ case JSOp::Mod:
+ if (!ModValues(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ case JSOp::Pow:
+ if (!PowValues(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ case JSOp::BitOr: {
+ if (!BitOr(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::BitXor: {
+ if (!BitXor(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::BitAnd: {
+ if (!BitAnd(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::Lsh: {
+ if (!BitLsh(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::Rsh: {
+ if (!BitRsh(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ }
+ case JSOp::Ursh: {
+ if (!UrshValues(cx, &lhsCopy, &rhsCopy, ret)) {
+ return false;
+ }
+ break;
+ }
+ default:
+ MOZ_CRASH("Unhandled baseline arith op");
+ }
+
+ TryAttachStub<BinaryArithIRGenerator>("BinaryArith", cx, frame, stub, op, lhs,
+ rhs, ret);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_BinaryArith() {
+ static_assert(R0 == JSReturnOperand);
+
+ // Restore the tail call register.
+ EmitRestoreTailCallReg(masm);
+
+ // Ensure stack is fully synced for the expression decompiler.
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+
+ // Push arguments.
+ masm.pushValue(R1);
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ HandleValue, MutableHandleValue);
+ return tailCallVM<Fn, DoBinaryArithFallback>(masm);
+}
+
+//
+// Compare_Fallback
+//
+bool DoCompareFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleValue lhs, HandleValue rhs,
+ MutableHandleValue ret) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+ JSOp op = JSOp(*pc);
+
+ FallbackICSpew(cx, stub, "Compare(%s)", CodeName(op));
+
+ // Don't pass lhs/rhs directly, we need the original values when
+ // generating stubs.
+ RootedValue lhsCopy(cx, lhs);
+ RootedValue rhsCopy(cx, rhs);
+
+ // Perform the compare operation.
+ bool out;
+ switch (op) {
+ case JSOp::Lt:
+ if (!LessThan(cx, &lhsCopy, &rhsCopy, &out)) {
+ return false;
+ }
+ break;
+ case JSOp::Le:
+ if (!LessThanOrEqual(cx, &lhsCopy, &rhsCopy, &out)) {
+ return false;
+ }
+ break;
+ case JSOp::Gt:
+ if (!GreaterThan(cx, &lhsCopy, &rhsCopy, &out)) {
+ return false;
+ }
+ break;
+ case JSOp::Ge:
+ if (!GreaterThanOrEqual(cx, &lhsCopy, &rhsCopy, &out)) {
+ return false;
+ }
+ break;
+ case JSOp::Eq:
+ if (!js::LooselyEqual(cx, lhsCopy, rhsCopy, &out)) {
+ return false;
+ }
+ break;
+ case JSOp::Ne:
+ if (!js::LooselyEqual(cx, lhsCopy, rhsCopy, &out)) {
+ return false;
+ }
+ out = !out;
+ break;
+ case JSOp::StrictEq:
+ if (!js::StrictlyEqual(cx, lhsCopy, rhsCopy, &out)) {
+ return false;
+ }
+ break;
+ case JSOp::StrictNe:
+ if (!js::StrictlyEqual(cx, lhsCopy, rhsCopy, &out)) {
+ return false;
+ }
+ out = !out;
+ break;
+ default:
+ MOZ_ASSERT_UNREACHABLE("Unhandled baseline compare op");
+ return false;
+ }
+
+ ret.setBoolean(out);
+
+ TryAttachStub<CompareIRGenerator>("Compare", cx, frame, stub, op, lhs, rhs);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_Compare() {
+ static_assert(R0 == JSReturnOperand);
+
+ // Restore the tail call register.
+ EmitRestoreTailCallReg(masm);
+
+ // Ensure stack is fully synced for the expression decompiler.
+ masm.pushValue(R0);
+ masm.pushValue(R1);
+
+ // Push arguments.
+ masm.pushValue(R1);
+ masm.pushValue(R0);
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn = bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleValue,
+ HandleValue, MutableHandleValue);
+ return tailCallVM<Fn, DoCompareFallback>(masm);
+}
+
+//
+// NewArray_Fallback
+//
+
+bool DoNewArrayFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "NewArray");
+
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+
+ uint32_t length = GET_UINT32(pc);
+ MOZ_ASSERT(length <= INT32_MAX,
+ "the bytecode emitter must fail to compile code that would "
+ "produce a length exceeding int32_t range");
+
+ Rooted<ArrayObject*> array(cx, NewArrayOperation(cx, length));
+ if (!array) {
+ return false;
+ }
+
+ TryAttachStub<NewArrayIRGenerator>("NewArray", cx, frame, stub, JSOp(*pc),
+ array, frame);
+
+ res.setObject(*array);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_NewArray() {
+ EmitRestoreTailCallReg(masm);
+
+ masm.push(ICStubReg); // stub.
+ masm.pushBaselineFramePtr(FramePointer, R0.scratchReg());
+
+ using Fn =
+ bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, MutableHandleValue);
+ return tailCallVM<Fn, DoNewArrayFallback>(masm);
+}
+
+//
+// NewObject_Fallback
+//
+bool DoNewObjectFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, MutableHandleValue res) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "NewObject");
+
+ RootedScript script(cx, frame->script());
+ jsbytecode* pc = StubOffsetToPc(stub, script);
+
+ RootedObject obj(cx, NewObjectOperation(cx, script, pc));
+ if (!obj) {
+ return false;
+ }
+
+ TryAttachStub<NewObjectIRGenerator>("NewObject", cx, frame, stub, JSOp(*pc),
+ obj, frame);
+
+ res.setObject(*obj);
+ return true;
+}
+
+bool FallbackICCodeCompiler::emit_NewObject() {
+ EmitRestoreTailCallReg(masm);
+
+ masm.push(ICStubReg); // stub.
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn =
+ bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, MutableHandleValue);
+ return tailCallVM<Fn, DoNewObjectFallback>(masm);
+}
+
+//
+// CloseIter_Fallback
+//
+
+bool DoCloseIterFallback(JSContext* cx, BaselineFrame* frame,
+ ICFallbackStub* stub, HandleObject iter) {
+ stub->incrementEnteredCount();
+ MaybeNotifyWarp(frame->outerScript(), stub);
+ FallbackICSpew(cx, stub, "CloseIter");
+
+ jsbytecode* pc = StubOffsetToPc(stub, frame->script());
+ CompletionKind kind = CompletionKind(GET_UINT8(pc));
+
+ TryAttachStub<CloseIterIRGenerator>("CloseIter", cx, frame, stub, iter, kind);
+
+ return CloseIterOperation(cx, iter, kind);
+}
+
+bool FallbackICCodeCompiler::emit_CloseIter() {
+ EmitRestoreTailCallReg(masm);
+
+ masm.push(R0.scratchReg());
+ masm.push(ICStubReg);
+ pushStubPayload(masm, R0.scratchReg());
+
+ using Fn =
+ bool (*)(JSContext*, BaselineFrame*, ICFallbackStub*, HandleObject);
+ return tailCallVM<Fn, DoCloseIterFallback>(masm);
+}
+
+bool JitRuntime::generateBaselineICFallbackCode(JSContext* cx) {
+ TempAllocator temp(&cx->tempLifoAlloc());
+ StackMacroAssembler masm(cx, temp);
+ PerfSpewerRangeRecorder rangeRecorder(masm);
+ AutoCreatedBy acb(masm, "JitRuntime::generateBaselineICFallbackCode");
+
+ BaselineICFallbackCode& fallbackCode = baselineICFallbackCode_.ref();
+ FallbackICCodeCompiler compiler(cx, fallbackCode, masm);
+
+ JitSpew(JitSpew_Codegen, "# Emitting Baseline IC fallback code");
+
+#define EMIT_CODE(kind) \
+ { \
+ AutoCreatedBy acb(masm, "kind=" #kind); \
+ uint32_t offset = startTrampolineCode(masm); \
+ InitMacroAssemblerForICStub(masm); \
+ if (!compiler.emit_##kind()) { \
+ return false; \
+ } \
+ fallbackCode.initOffset(BaselineICFallbackKind::kind, offset); \
+ rangeRecorder.recordOffset("BaselineICFallback: " #kind); \
+ }
+ IC_BASELINE_FALLBACK_CODE_KIND_LIST(EMIT_CODE)
+#undef EMIT_CODE
+
+ Linker linker(masm);
+ JitCode* code = linker.newCode(cx, CodeKind::Other);
+ if (!code) {
+ return false;
+ }
+
+ rangeRecorder.collectRangesForJitCode(code);
+
+#ifdef MOZ_VTUNE
+ vtune::MarkStub(code, "BaselineICFallback");
+#endif
+
+ fallbackCode.initCode(code);
+ return true;
+}
+
+} // namespace jit
+} // namespace js
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-20 09:34:07 +0000