Introduce "optimized_out" oddball marker for compilers.
This introduces {optimized_out} as another Oddball kind to be used by optimizing compilers when values are being optimized away. The aim is providing visibility when this value leaks into the application domain. Currently this will lead to {undefined} values appearing which then silently propagate through the application. The special oddball can be identified easily as a bug and also the debugger can treat it specially when needed. R=jarin@chromium.org Review URL: https://codereview.chromium.org/1810483002 Cr-Commit-Position: refs/heads/master@{#34817}
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@ -646,7 +646,7 @@ void AstGraphBuilder::ClearNonLiveSlotsInFrameStates() {
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}
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NonLiveFrameStateSlotReplacer replacer(
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&state_values_cache_, jsgraph()->UndefinedConstant(),
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&state_values_cache_, jsgraph()->OptimizedOutConstant(),
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liveness_analyzer()->local_count(), local_zone());
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Variable* arguments = info()->scope()->arguments();
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if (arguments != nullptr && arguments->IsStackAllocated()) {
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@ -29,6 +29,10 @@ Node* JSGraph::EmptyFixedArrayConstant() {
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HeapConstant(factory()->empty_fixed_array()));
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}
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Node* JSGraph::OptimizedOutConstant() {
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return CACHED(kOptimizedOutConstant,
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HeapConstant(factory()->optimized_out()));
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}
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Node* JSGraph::UndefinedConstant() {
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return CACHED(kUndefinedConstant, HeapConstant(factory()->undefined_value()));
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@ -41,6 +41,7 @@ class JSGraph : public ZoneObject {
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// Canonicalized global constants.
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Node* CEntryStubConstant(int result_size);
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Node* EmptyFixedArrayConstant();
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Node* OptimizedOutConstant();
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Node* UndefinedConstant();
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Node* TheHoleConstant();
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Node* TrueConstant();
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@ -136,6 +137,7 @@ class JSGraph : public ZoneObject {
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enum CachedNode {
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kCEntryStubConstant,
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kEmptyFixedArrayConstant,
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kOptimizedOutConstant,
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kUndefinedConstant,
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kTheHoleConstant,
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kTrueConstant,
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@ -37,9 +37,9 @@ void HEnvironmentLivenessAnalysisPhase::ZapEnvironmentSlot(
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int index, HSimulate* simulate) {
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int operand_index = simulate->ToOperandIndex(index);
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if (operand_index == -1) {
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simulate->AddAssignedValue(index, graph()->GetConstantUndefined());
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simulate->AddAssignedValue(index, graph()->GetConstantOptimizedOut());
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} else {
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simulate->SetOperandAt(operand_index, graph()->GetConstantUndefined());
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simulate->SetOperandAt(operand_index, graph()->GetConstantOptimizedOut());
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}
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}
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@ -690,13 +690,12 @@ HConstant* HGraph::GetConstantBool(bool value) {
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return value ? GetConstantTrue() : GetConstantFalse();
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}
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#define DEFINE_GET_CONSTANT(Name, name, type, htype, boolean_value, \
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#define DEFINE_GET_CONSTANT(Name, name, constant, type, htype, boolean_value, \
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undetectable) \
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HConstant* HGraph::GetConstant##Name() { \
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if (!constant_##name##_.is_set()) { \
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HConstant* constant = new (zone()) HConstant( \
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Unique<Object>::CreateImmovable( \
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isolate()->factory()->name##_value()), \
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Unique<Object>::CreateImmovable(isolate()->factory()->constant()), \
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Unique<Map>::CreateImmovable(isolate()->factory()->type##_map()), \
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false, Representation::Tagged(), htype, true, boolean_value, \
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undetectable, ODDBALL_TYPE); \
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@ -706,12 +705,17 @@ HConstant* HGraph::GetConstantBool(bool value) {
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return ReinsertConstantIfNecessary(constant_##name##_.get()); \
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}
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DEFINE_GET_CONSTANT(Undefined, undefined, undefined, HType::Undefined(), false,
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true)
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DEFINE_GET_CONSTANT(True, true, boolean, HType::Boolean(), true, false)
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DEFINE_GET_CONSTANT(False, false, boolean, HType::Boolean(), false, false)
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DEFINE_GET_CONSTANT(Hole, the_hole, the_hole, HType::None(), false, false)
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DEFINE_GET_CONSTANT(Null, null, null, HType::Null(), false, true)
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DEFINE_GET_CONSTANT(Undefined, undefined, undefined_value, undefined,
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HType::Undefined(), false, true)
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DEFINE_GET_CONSTANT(True, true, true_value, boolean, HType::Boolean(), true,
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false)
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DEFINE_GET_CONSTANT(False, false, false_value, boolean, HType::Boolean(), false,
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false)
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DEFINE_GET_CONSTANT(Hole, the_hole, the_hole_value, the_hole, HType::None(),
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false, false)
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DEFINE_GET_CONSTANT(Null, null, null_value, null, HType::Null(), false, true)
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DEFINE_GET_CONSTANT(OptimizedOut, optimized_out, optimized_out, optimized_out,
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HType::None(), false, false)
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#undef DEFINE_GET_CONSTANT
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@ -334,6 +334,7 @@ class HGraph final : public ZoneObject {
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HConstant* GetConstantBool(bool value);
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HConstant* GetConstantHole();
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HConstant* GetConstantNull();
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HConstant* GetConstantOptimizedOut();
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HConstant* GetInvalidContext();
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bool IsConstantUndefined(HConstant* constant);
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@ -472,6 +473,7 @@ class HGraph final : public ZoneObject {
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SetOncePointer<HConstant> constant_false_;
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SetOncePointer<HConstant> constant_the_hole_;
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SetOncePointer<HConstant> constant_null_;
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SetOncePointer<HConstant> constant_optimized_out_;
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SetOncePointer<HConstant> constant_invalid_context_;
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HOsrBuilder* osr_;
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@ -133,8 +133,10 @@ void FrameInspector::MaterializeStackLocals(Handle<JSObject> target,
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if (scope_info->LocalIsSynthetic(i)) continue;
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Handle<String> name(scope_info->StackLocalName(i));
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Handle<Object> value = GetExpression(scope_info->StackLocalIndex(i));
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// TODO(yangguo): We convert optimized out values to {undefined} when they
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// are passed to the debugger. Eventually we should handle them somehow.
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if (value->IsTheHole()) value = isolate_->factory()->undefined_value();
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if (value->IsOptimizedOut()) value = isolate_->factory()->undefined_value();
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JSObject::SetOwnPropertyIgnoreAttributes(target, name, value, NONE).Check();
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}
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}
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@ -2329,6 +2329,7 @@ bool Heap::CreateInitialMaps() {
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ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, no_interceptor_result_sentinel);
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ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, exception);
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ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, termination_exception);
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ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, optimized_out);
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for (unsigned i = 0; i < arraysize(string_type_table); i++) {
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const StringTypeTable& entry = string_type_table[i];
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@ -2700,6 +2701,11 @@ void Heap::CreateInitialObjects() {
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handle(Smi::FromInt(-5), isolate()), false,
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"undefined", Oddball::kException));
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set_optimized_out(
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*factory->NewOddball(factory->optimized_out_map(), "optimized_out",
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handle(Smi::FromInt(-6), isolate()), false,
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"undefined", Oddball::kOptimizedOut));
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for (unsigned i = 0; i < arraysize(constant_string_table); i++) {
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Handle<String> str =
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factory->InternalizeUtf8String(constant_string_table[i].contents);
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@ -75,6 +75,7 @@ namespace internal {
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V(Oddball, arguments_marker, ArgumentsMarker) \
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V(Oddball, exception, Exception) \
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V(Oddball, termination_exception, TerminationException) \
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V(Oddball, optimized_out, OptimizedOut) \
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V(FixedArray, number_string_cache, NumberStringCache) \
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V(Object, instanceof_cache_function, InstanceofCacheFunction) \
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V(Object, instanceof_cache_map, InstanceofCacheMap) \
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@ -147,6 +148,7 @@ namespace internal {
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V(Map, no_interceptor_result_sentinel_map, NoInterceptorResultSentinelMap) \
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V(Map, exception_map, ExceptionMap) \
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V(Map, termination_exception_map, TerminationExceptionMap) \
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V(Map, optimized_out_map, OptimizedOutMap) \
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V(Map, message_object_map, JSMessageObjectMap) \
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V(Map, foreign_map, ForeignMap) \
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V(Map, neander_map, NeanderMap) \
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@ -619,7 +619,7 @@ void Oddball::OddballVerify() {
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CHECK(number->IsSmi());
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int value = Smi::cast(number)->value();
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// Hidden oddballs have negative smis.
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const int kLeastHiddenOddballNumber = -5;
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const int kLeastHiddenOddballNumber = -6;
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CHECK_LE(value, 1);
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CHECK(value >= kLeastHiddenOddballNumber);
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}
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@ -642,6 +642,8 @@ void Oddball::OddballVerify() {
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CHECK(this == heap->termination_exception());
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} else if (map() == heap->exception_map()) {
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CHECK(this == heap->exception());
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} else if (map() == heap->optimized_out_map()) {
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CHECK(this == heap->optimized_out());
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} else {
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UNREACHABLE();
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}
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@ -1004,7 +1004,8 @@ template <class C> inline bool Is(Object* obj);
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V(Uninitialized) \
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V(True) \
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V(False) \
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V(ArgumentsMarker)
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V(ArgumentsMarker) \
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V(OptimizedOut)
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// The element types selection for CreateListFromArrayLike.
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enum class ElementTypes { kAll, kStringAndSymbol };
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@ -9595,6 +9596,7 @@ class Oddball: public HeapObject {
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static const byte kUninitialized = 6;
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static const byte kOther = 7;
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static const byte kException = 8;
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static const byte kOptimizedOut = 9;
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typedef FixedBodyDescriptor<kToStringOffset, kTypeOfOffset + kPointerSize,
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kSize> BodyDescriptor;
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@ -554,7 +554,11 @@ RUNTIME_FUNCTION(Runtime_GetFrameDetails) {
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// Use the value from the stack.
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if (scope_info->LocalIsSynthetic(i)) continue;
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locals->set(local * 2, scope_info->LocalName(i));
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locals->set(local * 2 + 1, *(frame_inspector.GetExpression(i)));
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Handle<Object> value = frame_inspector.GetExpression(i);
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// TODO(yangguo): We convert optimized out values to {undefined} when they
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// are passed to the debugger. Eventually we should handle them somehow.
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if (value->IsOptimizedOut()) value = isolate->factory()->undefined_value();
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locals->set(local * 2 + 1, *value);
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local++;
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}
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if (local < local_count) {
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@ -191,7 +191,8 @@ Type::bitset BitsetType::Lub(i::Map* map) {
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map == heap->uninitialized_map() ||
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map == heap->no_interceptor_result_sentinel_map() ||
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map == heap->termination_exception_map() ||
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map == heap->arguments_marker_map());
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map == heap->arguments_marker_map() ||
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map == heap->optimized_out_map());
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return kInternal & kTaggedPointer;
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}
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case HEAP_NUMBER_TYPE:
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