// Copyright 2014 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "src/compiler/simplified-lowering.h" #include <limits> #include "src/address-map.h" #include "src/base/bits.h" #include "src/code-factory.h" #include "src/compiler/access-builder.h" #include "src/compiler/common-operator.h" #include "src/compiler/compiler-source-position-table.h" #include "src/compiler/diamond.h" #include "src/compiler/linkage.h" #include "src/compiler/node-matchers.h" #include "src/compiler/node-origin-table.h" #include "src/compiler/node-properties.h" #include "src/compiler/operation-typer.h" #include "src/compiler/operator-properties.h" #include "src/compiler/representation-change.h" #include "src/compiler/simplified-operator.h" #include "src/compiler/type-cache.h" #include "src/conversions-inl.h" #include "src/objects.h" namespace v8 { namespace internal { namespace compiler { // Macro for outputting trace information from representation inference. #define TRACE(...) \ do { \ if (FLAG_trace_representation) PrintF(__VA_ARGS__); \ } while (false) // Representation selection and lowering of {Simplified} operators to machine // operators are interwined. We use a fixpoint calculation to compute both the // output representation and the best possible lowering for {Simplified} nodes. // Representation change insertion ensures that all values are in the correct // machine representation after this phase, as dictated by the machine // operators themselves. enum Phase { // 1.) PROPAGATE: Traverse the graph from the end, pushing usage information // backwards from uses to definitions, around cycles in phis, according // to local rules for each operator. // During this phase, the usage information for a node determines the best // possible lowering for each operator so far, and that in turn determines // the output representation. // Therefore, to be correct, this phase must iterate to a fixpoint before // the next phase can begin. PROPAGATE, // 2.) RETYPE: Propagate types from type feedback forwards. RETYPE, // 3.) LOWER: perform lowering for all {Simplified} nodes by replacing some // operators for some nodes, expanding some nodes to multiple nodes, or // removing some (redundant) nodes. // During this phase, use the {RepresentationChanger} to insert // representation changes between uses that demand a particular // representation and nodes that produce a different representation. LOWER }; namespace { MachineRepresentation MachineRepresentationFromArrayType( ExternalArrayType array_type) { switch (array_type) { case kExternalUint8Array: case kExternalUint8ClampedArray: case kExternalInt8Array: return MachineRepresentation::kWord8; case kExternalUint16Array: case kExternalInt16Array: return MachineRepresentation::kWord16; case kExternalUint32Array: case kExternalInt32Array: return MachineRepresentation::kWord32; case kExternalFloat32Array: return MachineRepresentation::kFloat32; case kExternalFloat64Array: return MachineRepresentation::kFloat64; case kExternalBigInt64Array: case kExternalBigUint64Array: UNIMPLEMENTED(); } UNREACHABLE(); } UseInfo CheckedUseInfoAsWord32FromHint( NumberOperationHint hint, const VectorSlotPair& feedback = VectorSlotPair(), IdentifyZeros identify_zeros = kDistinguishZeros) { switch (hint) { case NumberOperationHint::kSignedSmall: case NumberOperationHint::kSignedSmallInputs: return UseInfo::CheckedSignedSmallAsWord32(identify_zeros, feedback); case NumberOperationHint::kSigned32: return UseInfo::CheckedSigned32AsWord32(identify_zeros, feedback); case NumberOperationHint::kNumber: return UseInfo::CheckedNumberAsWord32(feedback); case NumberOperationHint::kNumberOrOddball: return UseInfo::CheckedNumberOrOddballAsWord32(feedback); } UNREACHABLE(); } UseInfo CheckedUseInfoAsFloat64FromHint( NumberOperationHint hint, const VectorSlotPair& feedback, IdentifyZeros identify_zeros = kDistinguishZeros) { switch (hint) { case NumberOperationHint::kSignedSmall: case NumberOperationHint::kSignedSmallInputs: case NumberOperationHint::kSigned32: // Not used currently. UNREACHABLE(); break; case NumberOperationHint::kNumber: return UseInfo::CheckedNumberAsFloat64(identify_zeros, feedback); case NumberOperationHint::kNumberOrOddball: return UseInfo::CheckedNumberOrOddballAsFloat64(identify_zeros, feedback); } UNREACHABLE(); } UseInfo TruncatingUseInfoFromRepresentation(MachineRepresentation rep) { switch (rep) { case MachineRepresentation::kTaggedSigned: return UseInfo::TaggedSigned(); case MachineRepresentation::kTaggedPointer: case MachineRepresentation::kTagged: return UseInfo::AnyTagged(); case MachineRepresentation::kFloat64: return UseInfo::TruncatingFloat64(); case MachineRepresentation::kFloat32: return UseInfo::Float32(); case MachineRepresentation::kWord8: case MachineRepresentation::kWord16: case MachineRepresentation::kWord32: return UseInfo::TruncatingWord32(); case MachineRepresentation::kWord64: return UseInfo::Word64(); case MachineRepresentation::kBit: return UseInfo::Bool(); case MachineRepresentation::kSimd128: case MachineRepresentation::kNone: break; } UNREACHABLE(); } UseInfo UseInfoForBasePointer(const FieldAccess& access) { return access.tag() != 0 ? UseInfo::AnyTagged() : UseInfo::Word(); } UseInfo UseInfoForBasePointer(const ElementAccess& access) { return access.tag() != 0 ? UseInfo::AnyTagged() : UseInfo::Word(); } void ReplaceEffectControlUses(Node* node, Node* effect, Node* control) { for (Edge edge : node->use_edges()) { if (NodeProperties::IsControlEdge(edge)) { edge.UpdateTo(control); } else if (NodeProperties::IsEffectEdge(edge)) { edge.UpdateTo(effect); } else { DCHECK(NodeProperties::IsValueEdge(edge) || NodeProperties::IsContextEdge(edge)); } } } bool CanOverflowSigned32(const Operator* op, Type left, Type right, Zone* type_zone) { // We assume the inputs are checked Signed32 (or known statically // to be Signed32). Technically, the inputs could also be minus zero, but // that cannot cause overflow. left = Type::Intersect(left, Type::Signed32(), type_zone); right = Type::Intersect(right, Type::Signed32(), type_zone); if (left.IsNone() || right.IsNone()) return false; switch (op->opcode()) { case IrOpcode::kSpeculativeSafeIntegerAdd: return (left.Max() + right.Max() > kMaxInt) || (left.Min() + right.Min() < kMinInt); case IrOpcode::kSpeculativeSafeIntegerSubtract: return (left.Max() - right.Min() > kMaxInt) || (left.Min() - right.Max() < kMinInt); default: UNREACHABLE(); } return true; } bool IsSomePositiveOrderedNumber(Type type) { return type.Is(Type::OrderedNumber()) && !type.IsNone() && type.Min() > 0; } } // namespace #ifdef DEBUG // Helpers for monotonicity checking. class InputUseInfos { public: explicit InputUseInfos(Zone* zone) : input_use_infos_(zone) {} void SetAndCheckInput(Node* node, int index, UseInfo use_info) { if (input_use_infos_.empty()) { input_use_infos_.resize(node->InputCount(), UseInfo::None()); } // Check that the new use informatin is a super-type of the old // one. DCHECK(IsUseLessGeneral(input_use_infos_[index], use_info)); input_use_infos_[index] = use_info; } private: ZoneVector<UseInfo> input_use_infos_; static bool IsUseLessGeneral(UseInfo use1, UseInfo use2) { return use1.truncation().IsLessGeneralThan(use2.truncation()); } }; #endif // DEBUG class RepresentationSelector { public: // Information for each node tracked during the fixpoint. class NodeInfo final { public: // Adds new use to the node. Returns true if something has changed // and the node has to be requeued. bool AddUse(UseInfo info) { Truncation old_truncation = truncation_; truncation_ = Truncation::Generalize(truncation_, info.truncation()); return truncation_ != old_truncation; } void set_queued() { state_ = kQueued; } void set_visited() { state_ = kVisited; } void set_pushed() { state_ = kPushed; } void reset_state() { state_ = kUnvisited; } bool visited() const { return state_ == kVisited; } bool queued() const { return state_ == kQueued; } bool unvisited() const { return state_ == kUnvisited; } Truncation truncation() const { return truncation_; } void set_output(MachineRepresentation output) { representation_ = output; } MachineRepresentation representation() const { return representation_; } // Helpers for feedback typing. void set_feedback_type(Type type) { feedback_type_ = type; } Type feedback_type() const { return feedback_type_; } void set_weakened() { weakened_ = true; } bool weakened() const { return weakened_; } void set_restriction_type(Type type) { restriction_type_ = type; } Type restriction_type() const { return restriction_type_; } private: enum State : uint8_t { kUnvisited, kPushed, kVisited, kQueued }; State state_ = kUnvisited; MachineRepresentation representation_ = MachineRepresentation::kNone; // Output representation. Truncation truncation_ = Truncation::None(); // Information about uses. Type restriction_type_ = Type::Any(); Type feedback_type_; bool weakened_ = false; }; RepresentationSelector(JSGraph* jsgraph, JSHeapBroker* broker, Zone* zone, RepresentationChanger* changer, SourcePositionTable* source_positions, NodeOriginTable* node_origins) : jsgraph_(jsgraph), zone_(zone), count_(jsgraph->graph()->NodeCount()), info_(count_, zone), #ifdef DEBUG node_input_use_infos_(count_, InputUseInfos(zone), zone), #endif nodes_(zone), replacements_(zone), phase_(PROPAGATE), changer_(changer), queue_(zone), typing_stack_(zone), source_positions_(source_positions), node_origins_(node_origins), type_cache_(TypeCache::Get()), op_typer_(broker, graph_zone()) { } // Forward propagation of types from type feedback. void RunTypePropagationPhase() { // Run type propagation. TRACE("--{Type propagation phase}--\n"); phase_ = RETYPE; ResetNodeInfoState(); DCHECK(typing_stack_.empty()); typing_stack_.push({graph()->end(), 0}); GetInfo(graph()->end())->set_pushed(); while (!typing_stack_.empty()) { NodeState& current = typing_stack_.top(); // If there is an unvisited input, push it and continue. bool pushed_unvisited = false; while (current.input_index < current.node->InputCount()) { Node* input = current.node->InputAt(current.input_index); NodeInfo* input_info = GetInfo(input); current.input_index++; if (input_info->unvisited()) { input_info->set_pushed(); typing_stack_.push({input, 0}); pushed_unvisited = true; break; } } if (pushed_unvisited) continue; // Process the top of the stack. Node* node = current.node; typing_stack_.pop(); NodeInfo* info = GetInfo(node); info->set_visited(); bool updated = UpdateFeedbackType(node); TRACE(" visit #%d: %s\n", node->id(), node->op()->mnemonic()); VisitNode(node, info->truncation(), nullptr); TRACE(" ==> output "); PrintOutputInfo(info); TRACE("\n"); if (updated) { for (Node* const user : node->uses()) { if (GetInfo(user)->visited()) { GetInfo(user)->set_queued(); queue_.push(user); } } } } // Process the revisit queue. while (!queue_.empty()) { Node* node = queue_.front(); queue_.pop(); NodeInfo* info = GetInfo(node); info->set_visited(); bool updated = UpdateFeedbackType(node); TRACE(" visit #%d: %s\n", node->id(), node->op()->mnemonic()); VisitNode(node, info->truncation(), nullptr); TRACE(" ==> output "); PrintOutputInfo(info); TRACE("\n"); if (updated) { for (Node* const user : node->uses()) { if (GetInfo(user)->visited()) { GetInfo(user)->set_queued(); queue_.push(user); } } } } } void ResetNodeInfoState() { // Clean up for the next phase. for (NodeInfo& info : info_) { info.reset_state(); } } Type TypeOf(Node* node) { Type type = GetInfo(node)->feedback_type(); return type.IsInvalid() ? NodeProperties::GetType(node) : type; } Type FeedbackTypeOf(Node* node) { Type type = GetInfo(node)->feedback_type(); return type.IsInvalid() ? Type::None() : type; } Type TypePhi(Node* node) { int arity = node->op()->ValueInputCount(); Type type = FeedbackTypeOf(node->InputAt(0)); for (int i = 1; i < arity; ++i) { type = op_typer_.Merge(type, FeedbackTypeOf(node->InputAt(i))); } return type; } Type TypeSelect(Node* node) { return op_typer_.Merge(FeedbackTypeOf(node->InputAt(1)), FeedbackTypeOf(node->InputAt(2))); } bool UpdateFeedbackType(Node* node) { if (node->op()->ValueOutputCount() == 0) return false; NodeInfo* info = GetInfo(node); Type type = info->feedback_type(); Type new_type = type; // For any non-phi node just wait until we get all inputs typed. We only // allow untyped inputs for phi nodes because phis are the only places // where cycles need to be broken. if (node->opcode() != IrOpcode::kPhi) { for (int i = 0; i < node->op()->ValueInputCount(); i++) { if (GetInfo(node->InputAt(i))->feedback_type().IsInvalid()) { return false; } } } // We preload these values here to avoid increasing the binary size too // much, which happens if we inline the calls into the macros below. Type input0_type; if (node->InputCount() > 0) input0_type = FeedbackTypeOf(node->InputAt(0)); Type input1_type; if (node->InputCount() > 1) input1_type = FeedbackTypeOf(node->InputAt(1)); switch (node->opcode()) { #define DECLARE_CASE(Name) \ case IrOpcode::k##Name: { \ new_type = op_typer_.Name(input0_type, input1_type); \ break; \ } SIMPLIFIED_NUMBER_BINOP_LIST(DECLARE_CASE) DECLARE_CASE(SameValue) #undef DECLARE_CASE #define DECLARE_CASE(Name) \ case IrOpcode::k##Name: { \ new_type = Type::Intersect(op_typer_.Name(input0_type, input1_type), \ info->restriction_type(), graph_zone()); \ break; \ } SIMPLIFIED_SPECULATIVE_NUMBER_BINOP_LIST(DECLARE_CASE) #undef DECLARE_CASE #define DECLARE_CASE(Name) \ case IrOpcode::k##Name: { \ new_type = op_typer_.Name(input0_type); \ break; \ } SIMPLIFIED_NUMBER_UNOP_LIST(DECLARE_CASE) #undef DECLARE_CASE #define DECLARE_CASE(Name) \ case IrOpcode::k##Name: { \ new_type = Type::Intersect(op_typer_.Name(input0_type), \ info->restriction_type(), graph_zone()); \ break; \ } SIMPLIFIED_SPECULATIVE_NUMBER_UNOP_LIST(DECLARE_CASE) #undef DECLARE_CASE case IrOpcode::kConvertReceiver: new_type = op_typer_.ConvertReceiver(input0_type); break; case IrOpcode::kPlainPrimitiveToNumber: new_type = op_typer_.ToNumber(input0_type); break; case IrOpcode::kCheckBounds: new_type = Type::Intersect(op_typer_.CheckBounds(input0_type, input1_type), info->restriction_type(), graph_zone()); break; case IrOpcode::kCheckFloat64Hole: new_type = Type::Intersect(op_typer_.CheckFloat64Hole(input0_type), info->restriction_type(), graph_zone()); break; case IrOpcode::kCheckNumber: new_type = Type::Intersect(op_typer_.CheckNumber(input0_type), info->restriction_type(), graph_zone()); break; case IrOpcode::kPhi: { new_type = TypePhi(node); if (!type.IsInvalid()) { new_type = Weaken(node, type, new_type); } break; } case IrOpcode::kConvertTaggedHoleToUndefined: new_type = op_typer_.ConvertTaggedHoleToUndefined( FeedbackTypeOf(node->InputAt(0))); break; case IrOpcode::kTypeGuard: { new_type = op_typer_.TypeTypeGuard(node->op(), FeedbackTypeOf(node->InputAt(0))); break; } case IrOpcode::kSelect: { new_type = TypeSelect(node); break; } default: // Shortcut for operations that we do not handle. if (type.IsInvalid()) { GetInfo(node)->set_feedback_type(NodeProperties::GetType(node)); return true; } return false; } // We need to guarantee that the feedback type is a subtype of the upper // bound. Naively that should hold, but weakening can actually produce // a bigger type if we are unlucky with ordering of phi typing. To be // really sure, just intersect the upper bound with the feedback type. new_type = Type::Intersect(GetUpperBound(node), new_type, graph_zone()); if (!type.IsInvalid() && new_type.Is(type)) return false; GetInfo(node)->set_feedback_type(new_type); if (FLAG_trace_representation) { PrintNodeFeedbackType(node); } return true; } void PrintNodeFeedbackType(Node* n) { StdoutStream os; os << "#" << n->id() << ":" << *n->op() << "("; int j = 0; for (Node* const i : n->inputs()) { if (j++ > 0) os << ", "; os << "#" << i->id() << ":" << i->op()->mnemonic(); } os << ")"; if (NodeProperties::IsTyped(n)) { Type static_type = NodeProperties::GetType(n); os << " [Static type: " << static_type; Type feedback_type = GetInfo(n)->feedback_type(); if (!feedback_type.IsInvalid() && feedback_type != static_type) { os << ", Feedback type: " << feedback_type; } os << "]"; } os << std::endl; } Type Weaken(Node* node, Type previous_type, Type current_type) { // If the types have nothing to do with integers, return the types. Type const integer = type_cache_->kInteger; if (!previous_type.Maybe(integer)) { return current_type; } DCHECK(current_type.Maybe(integer)); Type current_integer = Type::Intersect(current_type, integer, graph_zone()); DCHECK(!current_integer.IsNone()); Type previous_integer = Type::Intersect(previous_type, integer, graph_zone()); DCHECK(!previous_integer.IsNone()); // Once we start weakening a node, we should always weaken. if (!GetInfo(node)->weakened()) { // Only weaken if there is range involved; we should converge quickly // for all other types (the exception is a union of many constants, // but we currently do not increase the number of constants in unions). Type previous = previous_integer.GetRange(); Type current = current_integer.GetRange(); if (current.IsInvalid() || previous.IsInvalid()) { return current_type; } // Range is involved => we are weakening. GetInfo(node)->set_weakened(); } return Type::Union(current_type, op_typer_.WeakenRange(previous_integer, current_integer), graph_zone()); } // Backward propagation of truncations. void RunTruncationPropagationPhase() { // Run propagation phase to a fixpoint. TRACE("--{Propagation phase}--\n"); phase_ = PROPAGATE; EnqueueInitial(jsgraph_->graph()->end()); // Process nodes from the queue until it is empty. while (!queue_.empty()) { Node* node = queue_.front(); NodeInfo* info = GetInfo(node); queue_.pop(); info->set_visited(); TRACE(" visit #%d: %s (trunc: %s)\n", node->id(), node->op()->mnemonic(), info->truncation().description()); VisitNode(node, info->truncation(), nullptr); } } void Run(SimplifiedLowering* lowering) { RunTruncationPropagationPhase(); RunTypePropagationPhase(); // Run lowering and change insertion phase. TRACE("--{Simplified lowering phase}--\n"); phase_ = LOWER; // Process nodes from the collected {nodes_} vector. for (NodeVector::iterator i = nodes_.begin(); i != nodes_.end(); ++i) { Node* node = *i; NodeInfo* info = GetInfo(node); TRACE(" visit #%d: %s\n", node->id(), node->op()->mnemonic()); // Reuse {VisitNode()} so the representation rules are in one place. SourcePositionTable::Scope scope( source_positions_, source_positions_->GetSourcePosition(node)); NodeOriginTable::Scope origin_scope(node_origins_, "simplified lowering", node); VisitNode(node, info->truncation(), lowering); } // Perform the final replacements. for (NodeVector::iterator i = replacements_.begin(); i != replacements_.end(); ++i) { Node* node = *i; Node* replacement = *(++i); node->ReplaceUses(replacement); node->Kill(); // We also need to replace the node in the rest of the vector. for (NodeVector::iterator j = i + 1; j != replacements_.end(); ++j) { ++j; if (*j == node) *j = replacement; } } } void EnqueueInitial(Node* node) { NodeInfo* info = GetInfo(node); info->set_queued(); nodes_.push_back(node); queue_.push(node); } // Enqueue {use_node}'s {index} input if the {use} contains new information // for that input node. Add the input to {nodes_} if this is the first time // it's been visited. void EnqueueInput(Node* use_node, int index, UseInfo use_info = UseInfo::None()) { Node* node = use_node->InputAt(index); if (phase_ != PROPAGATE) return; NodeInfo* info = GetInfo(node); #ifdef DEBUG // Check monotonicity of input requirements. node_input_use_infos_[use_node->id()].SetAndCheckInput(use_node, index, use_info); #endif // DEBUG if (info->unvisited()) { // First visit of this node. info->set_queued(); nodes_.push_back(node); queue_.push(node); TRACE(" initial #%i: ", node->id()); info->AddUse(use_info); PrintTruncation(info->truncation()); return; } TRACE(" queue #%i?: ", node->id()); PrintTruncation(info->truncation()); if (info->AddUse(use_info)) { // New usage information for the node is available. if (!info->queued()) { queue_.push(node); info->set_queued(); TRACE(" added: "); } else { TRACE(" inqueue: "); } PrintTruncation(info->truncation()); } } bool lower() const { return phase_ == LOWER; } bool retype() const { return phase_ == RETYPE; } bool propagate() const { return phase_ == PROPAGATE; } void SetOutput(Node* node, MachineRepresentation representation, Type restriction_type = Type::Any()) { NodeInfo* const info = GetInfo(node); switch (phase_) { case PROPAGATE: info->set_restriction_type(restriction_type); break; case RETYPE: DCHECK(info->restriction_type().Is(restriction_type)); DCHECK(restriction_type.Is(info->restriction_type())); info->set_output(representation); break; case LOWER: DCHECK_EQ(info->representation(), representation); DCHECK(info->restriction_type().Is(restriction_type)); DCHECK(restriction_type.Is(info->restriction_type())); break; } } Type GetUpperBound(Node* node) { return NodeProperties::GetType(node); } bool InputCannotBe(Node* node, Type type) { DCHECK_EQ(1, node->op()->ValueInputCount()); return !GetUpperBound(node->InputAt(0)).Maybe(type); } bool InputIs(Node* node, Type type) { DCHECK_EQ(1, node->op()->ValueInputCount()); return GetUpperBound(node->InputAt(0)).Is(type); } bool BothInputsAreSigned32(Node* node) { return BothInputsAre(node, Type::Signed32()); } bool BothInputsAreUnsigned32(Node* node) { return BothInputsAre(node, Type::Unsigned32()); } bool BothInputsAre(Node* node, Type type) { DCHECK_EQ(2, node->op()->ValueInputCount()); return GetUpperBound(node->InputAt(0)).Is(type) && GetUpperBound(node->InputAt(1)).Is(type); } bool IsNodeRepresentationTagged(Node* node) { MachineRepresentation representation = GetInfo(node)->representation(); return IsAnyTagged(representation); } bool OneInputCannotBe(Node* node, Type type) { DCHECK_EQ(2, node->op()->ValueInputCount()); return !GetUpperBound(node->InputAt(0)).Maybe(type) || !GetUpperBound(node->InputAt(1)).Maybe(type); } void ChangeToPureOp(Node* node, const Operator* new_op) { DCHECK(new_op->HasProperty(Operator::kPure)); if (node->op()->EffectInputCount() > 0) { DCHECK_LT(0, node->op()->ControlInputCount()); Node* control = NodeProperties::GetControlInput(node); Node* effect = NodeProperties::GetEffectInput(node); if (TypeOf(node).IsNone()) { // If the node is unreachable, insert an Unreachable node and mark the // value dead. // TODO(jarin,tebbi) Find a way to unify/merge this insertion with // InsertUnreachableIfNecessary. Node* unreachable = effect = graph()->NewNode( jsgraph_->common()->Unreachable(), effect, control); new_op = jsgraph_->common()->DeadValue(GetInfo(node)->representation()); node->ReplaceInput(0, unreachable); } // Rewire the effect and control chains. node->TrimInputCount(new_op->ValueInputCount()); ReplaceEffectControlUses(node, effect, control); } else { DCHECK_EQ(0, node->op()->ControlInputCount()); } NodeProperties::ChangeOp(node, new_op); } // Converts input {index} of {node} according to given UseInfo {use}, // assuming the type of the input is {input_type}. If {input_type} is null, // it takes the input from the input node {TypeOf(node->InputAt(index))}. void ConvertInput(Node* node, int index, UseInfo use, Type input_type = Type::Invalid()) { Node* input = node->InputAt(index); // In the change phase, insert a change before the use if necessary. if (use.representation() == MachineRepresentation::kNone) return; // No input requirement on the use. DCHECK_NOT_NULL(input); NodeInfo* input_info = GetInfo(input); MachineRepresentation input_rep = input_info->representation(); if (input_rep != use.representation() || use.type_check() != TypeCheckKind::kNone) { // Output representation doesn't match usage. TRACE(" change: #%d:%s(@%d #%d:%s) ", node->id(), node->op()->mnemonic(), index, input->id(), input->op()->mnemonic()); TRACE(" from "); PrintOutputInfo(input_info); TRACE(" to "); PrintUseInfo(use); TRACE("\n"); if (input_type.IsInvalid()) { input_type = TypeOf(input); } Node* n = changer_->GetRepresentationFor( input, input_info->representation(), input_type, node, use); node->ReplaceInput(index, n); } } void ProcessInput(Node* node, int index, UseInfo use) { switch (phase_) { case PROPAGATE: EnqueueInput(node, index, use); break; case RETYPE: break; case LOWER: ConvertInput(node, index, use); break; } } void ProcessRemainingInputs(Node* node, int index) { DCHECK_GE(index, NodeProperties::PastValueIndex(node)); DCHECK_GE(index, NodeProperties::PastContextIndex(node)); for (int i = std::max(index, NodeProperties::FirstEffectIndex(node)); i < NodeProperties::PastEffectIndex(node); ++i) { EnqueueInput(node, i); // Effect inputs: just visit } for (int i = std::max(index, NodeProperties::FirstControlIndex(node)); i < NodeProperties::PastControlIndex(node); ++i) { EnqueueInput(node, i); // Control inputs: just visit } } // The default, most general visitation case. For {node}, process all value, // context, frame state, effect, and control inputs, assuming that value // inputs should have {kRepTagged} representation and can observe all output // values {kTypeAny}. void VisitInputs(Node* node) { int tagged_count = node->op()->ValueInputCount() + OperatorProperties::GetContextInputCount(node->op()) + OperatorProperties::GetFrameStateInputCount(node->op()); // Visit value, context and frame state inputs as tagged. for (int i = 0; i < tagged_count; i++) { ProcessInput(node, i, UseInfo::AnyTagged()); } // Only enqueue other inputs (effects, control). for (int i = tagged_count; i < node->InputCount(); i++) { EnqueueInput(node, i); } } void VisitReturn(Node* node) { int tagged_limit = node->op()->ValueInputCount() + OperatorProperties::GetContextInputCount(node->op()) + OperatorProperties::GetFrameStateInputCount(node->op()); // Visit integer slot count to pop ProcessInput(node, 0, UseInfo::TruncatingWord32()); // Visit value, context and frame state inputs as tagged. for (int i = 1; i < tagged_limit; i++) { ProcessInput(node, i, UseInfo::AnyTagged()); } // Only enqueue other inputs (effects, control). for (int i = tagged_limit; i < node->InputCount(); i++) { EnqueueInput(node, i); } } // Helper for an unused node. void VisitUnused(Node* node) { int value_count = node->op()->ValueInputCount() + OperatorProperties::GetContextInputCount(node->op()) + OperatorProperties::GetFrameStateInputCount(node->op()); for (int i = 0; i < value_count; i++) { ProcessInput(node, i, UseInfo::None()); } ProcessRemainingInputs(node, value_count); if (lower()) Kill(node); } // Helper for no-op node. void VisitNoop(Node* node, Truncation truncation) { if (truncation.IsUnused()) return VisitUnused(node); MachineRepresentation representation = GetOutputInfoForPhi(node, TypeOf(node), truncation); VisitUnop(node, UseInfo(representation, truncation), representation); if (lower()) DeferReplacement(node, node->InputAt(0)); } // Helper for binops of the R x L -> O variety. void VisitBinop(Node* node, UseInfo left_use, UseInfo right_use, MachineRepresentation output, Type restriction_type = Type::Any()) { DCHECK_EQ(2, node->op()->ValueInputCount()); ProcessInput(node, 0, left_use); ProcessInput(node, 1, right_use); for (int i = 2; i < node->InputCount(); i++) { EnqueueInput(node, i); } SetOutput(node, output, restriction_type); } // Helper for binops of the I x I -> O variety. void VisitBinop(Node* node, UseInfo input_use, MachineRepresentation output, Type restriction_type = Type::Any()) { VisitBinop(node, input_use, input_use, output, restriction_type); } void VisitSpeculativeInt32Binop(Node* node) { DCHECK_EQ(2, node->op()->ValueInputCount()); if (BothInputsAre(node, Type::NumberOrOddball())) { return VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); } NumberOperationHint hint = NumberOperationHintOf(node->op()); return VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint), MachineRepresentation::kWord32); } // Helper for unops of the I -> O variety. void VisitUnop(Node* node, UseInfo input_use, MachineRepresentation output, Type restriction_type = Type::Any()) { DCHECK_EQ(1, node->op()->ValueInputCount()); ProcessInput(node, 0, input_use); ProcessRemainingInputs(node, 1); SetOutput(node, output, restriction_type); } // Helper for leaf nodes. void VisitLeaf(Node* node, MachineRepresentation output) { DCHECK_EQ(0, node->InputCount()); SetOutput(node, output); } // Helpers for specific types of binops. void VisitFloat64Binop(Node* node) { VisitBinop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); } void VisitInt64Binop(Node* node) { VisitBinop(node, UseInfo::Word64(), MachineRepresentation::kWord64); } void VisitWord32TruncatingBinop(Node* node) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); } // Infer representation for phi-like nodes. // The {node} parameter is only used to decide on the int64 representation. // Once the type system supports an external pointer type, the {node} // parameter can be removed. MachineRepresentation GetOutputInfoForPhi(Node* node, Type type, Truncation use) { // Compute the representation. if (type.Is(Type::None())) { return MachineRepresentation::kNone; } else if (type.Is(Type::Signed32()) || type.Is(Type::Unsigned32())) { return MachineRepresentation::kWord32; } else if (type.Is(Type::NumberOrOddball()) && use.IsUsedAsWord32()) { return MachineRepresentation::kWord32; } else if (type.Is(Type::Boolean())) { return MachineRepresentation::kBit; } else if (type.Is(Type::NumberOrOddball()) && use.IsUsedAsFloat64()) { return MachineRepresentation::kFloat64; } else if (type.Is(Type::Union(Type::SignedSmall(), Type::NaN(), zone()))) { // TODO(turbofan): For Phis that return either NaN or some Smi, it's // beneficial to not go all the way to double, unless the uses are // double uses. For tagging that just means some potentially expensive // allocation code; we might want to do the same for -0 as well? return MachineRepresentation::kTagged; } else if (type.Is(Type::Number())) { return MachineRepresentation::kFloat64; } else if (type.Is(Type::ExternalPointer())) { return MachineType::PointerRepresentation(); } return MachineRepresentation::kTagged; } // Helper for handling selects. void VisitSelect(Node* node, Truncation truncation, SimplifiedLowering* lowering) { DCHECK(TypeOf(node->InputAt(0)).Is(Type::Boolean())); ProcessInput(node, 0, UseInfo::Bool()); MachineRepresentation output = GetOutputInfoForPhi(node, TypeOf(node), truncation); SetOutput(node, output); if (lower()) { // Update the select operator. SelectParameters p = SelectParametersOf(node->op()); if (output != p.representation()) { NodeProperties::ChangeOp(node, lowering->common()->Select(output, p.hint())); } } // Convert inputs to the output representation of this phi, pass the // truncation truncation along. UseInfo input_use(output, truncation); ProcessInput(node, 1, input_use); ProcessInput(node, 2, input_use); } // Helper for handling phis. void VisitPhi(Node* node, Truncation truncation, SimplifiedLowering* lowering) { MachineRepresentation output = GetOutputInfoForPhi(node, TypeOf(node), truncation); // Only set the output representation if not running with type // feedback. (Feedback typing will set the representation.) SetOutput(node, output); int values = node->op()->ValueInputCount(); if (lower()) { // Update the phi operator. if (output != PhiRepresentationOf(node->op())) { NodeProperties::ChangeOp(node, lowering->common()->Phi(output, values)); } } // Convert inputs to the output representation of this phi, pass the // truncation along. UseInfo input_use(output, truncation); for (int i = 0; i < node->InputCount(); i++) { ProcessInput(node, i, i < values ? input_use : UseInfo::None()); } } void VisitObjectIs(Node* node, Type type, SimplifiedLowering* lowering) { Type const input_type = TypeOf(node->InputAt(0)); if (input_type.Is(type)) { VisitUnop(node, UseInfo::None(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(1)); } } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); if (lower() && !input_type.Maybe(type)) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(0)); } } } void VisitCheck(Node* node, Type type, SimplifiedLowering* lowering) { if (InputIs(node, type)) { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); if (lower()) DeferReplacement(node, node->InputAt(0)); } else { VisitUnop(node, UseInfo::CheckedHeapObjectAsTaggedPointer(VectorSlotPair()), MachineRepresentation::kTaggedPointer); } } void VisitCall(Node* node, SimplifiedLowering* lowering) { auto call_descriptor = CallDescriptorOf(node->op()); int params = static_cast<int>(call_descriptor->ParameterCount()); int value_input_count = node->op()->ValueInputCount(); // Propagate representation information from call descriptor. for (int i = 0; i < value_input_count; i++) { if (i == 0) { // The target of the call. ProcessInput(node, i, UseInfo::Any()); } else if ((i - 1) < params) { ProcessInput(node, i, TruncatingUseInfoFromRepresentation( call_descriptor->GetInputType(i).representation())); } else { ProcessInput(node, i, UseInfo::AnyTagged()); } } ProcessRemainingInputs(node, value_input_count); if (call_descriptor->ReturnCount() > 0) { SetOutput(node, call_descriptor->GetReturnType(0).representation()); } else { SetOutput(node, MachineRepresentation::kTagged); } } void MaskShiftOperand(Node* node, Type rhs_type) { if (!rhs_type.Is(type_cache_->kZeroToThirtyOne)) { Node* const rhs = NodeProperties::GetValueInput(node, 1); node->ReplaceInput(1, graph()->NewNode(jsgraph_->machine()->Word32And(), rhs, jsgraph_->Int32Constant(0x1F))); } } static MachineSemantic DeoptValueSemanticOf(Type type) { // We only need signedness to do deopt correctly. if (type.Is(Type::Signed32())) { return MachineSemantic::kInt32; } else if (type.Is(Type::Unsigned32())) { return MachineSemantic::kUint32; } else { return MachineSemantic::kAny; } } static MachineType DeoptMachineTypeOf(MachineRepresentation rep, Type type) { if (type.IsNone()) { return MachineType::None(); } // Do not distinguish between various Tagged variations. if (IsAnyTagged(rep)) { return MachineType::AnyTagged(); } // Word64 representation is only valid for safe integer values. if (rep == MachineRepresentation::kWord64) { DCHECK(type.Is(TypeCache::Get()->kSafeInteger)); return MachineType(rep, MachineSemantic::kInt64); } MachineType machine_type(rep, DeoptValueSemanticOf(type)); DCHECK(machine_type.representation() != MachineRepresentation::kWord32 || machine_type.semantic() == MachineSemantic::kInt32 || machine_type.semantic() == MachineSemantic::kUint32); DCHECK(machine_type.representation() != MachineRepresentation::kBit || type.Is(Type::Boolean())); return machine_type; } void VisitStateValues(Node* node) { if (propagate()) { for (int i = 0; i < node->InputCount(); i++) { EnqueueInput(node, i, UseInfo::Any()); } } else if (lower()) { Zone* zone = jsgraph_->zone(); ZoneVector<MachineType>* types = new (zone->New(sizeof(ZoneVector<MachineType>))) ZoneVector<MachineType>(node->InputCount(), zone); for (int i = 0; i < node->InputCount(); i++) { Node* input = node->InputAt(i); (*types)[i] = DeoptMachineTypeOf(GetInfo(input)->representation(), TypeOf(input)); } SparseInputMask mask = SparseInputMaskOf(node->op()); NodeProperties::ChangeOp( node, jsgraph_->common()->TypedStateValues(types, mask)); } SetOutput(node, MachineRepresentation::kTagged); } void VisitFrameState(Node* node) { DCHECK_EQ(5, node->op()->ValueInputCount()); DCHECK_EQ(1, OperatorProperties::GetFrameStateInputCount(node->op())); ProcessInput(node, 0, UseInfo::AnyTagged()); // Parameters. ProcessInput(node, 1, UseInfo::AnyTagged()); // Registers. // Accumulator is a special flower - we need to remember its type in // a singleton typed-state-values node (as if it was a singleton // state-values node). if (propagate()) { EnqueueInput(node, 2, UseInfo::Any()); } else if (lower()) { Zone* zone = jsgraph_->zone(); Node* accumulator = node->InputAt(2); if (accumulator == jsgraph_->OptimizedOutConstant()) { node->ReplaceInput(2, jsgraph_->SingleDeadTypedStateValues()); } else { ZoneVector<MachineType>* types = new (zone->New(sizeof(ZoneVector<MachineType>))) ZoneVector<MachineType>(1, zone); (*types)[0] = DeoptMachineTypeOf(GetInfo(accumulator)->representation(), TypeOf(accumulator)); node->ReplaceInput( 2, jsgraph_->graph()->NewNode(jsgraph_->common()->TypedStateValues( types, SparseInputMask::Dense()), accumulator)); } } ProcessInput(node, 3, UseInfo::AnyTagged()); // Context. ProcessInput(node, 4, UseInfo::AnyTagged()); // Closure. ProcessInput(node, 5, UseInfo::AnyTagged()); // Outer frame state. return SetOutput(node, MachineRepresentation::kTagged); } void VisitObjectState(Node* node) { if (propagate()) { for (int i = 0; i < node->InputCount(); i++) { EnqueueInput(node, i, UseInfo::Any()); } } else if (lower()) { Zone* zone = jsgraph_->zone(); ZoneVector<MachineType>* types = new (zone->New(sizeof(ZoneVector<MachineType>))) ZoneVector<MachineType>(node->InputCount(), zone); for (int i = 0; i < node->InputCount(); i++) { Node* input = node->InputAt(i); (*types)[i] = DeoptMachineTypeOf(GetInfo(input)->representation(), TypeOf(input)); } NodeProperties::ChangeOp(node, jsgraph_->common()->TypedObjectState( ObjectIdOf(node->op()), types)); } SetOutput(node, MachineRepresentation::kTagged); } const Operator* Int32Op(Node* node) { return changer_->Int32OperatorFor(node->opcode()); } const Operator* Int32OverflowOp(Node* node) { return changer_->Int32OverflowOperatorFor(node->opcode()); } const Operator* Int64Op(Node* node) { return changer_->Int64OperatorFor(node->opcode()); } const Operator* Uint32Op(Node* node) { return changer_->Uint32OperatorFor(node->opcode()); } const Operator* Uint32OverflowOp(Node* node) { return changer_->Uint32OverflowOperatorFor(node->opcode()); } const Operator* Float64Op(Node* node) { return changer_->Float64OperatorFor(node->opcode()); } WriteBarrierKind WriteBarrierKindFor( BaseTaggedness base_taggedness, MachineRepresentation field_representation, Type field_type, MachineRepresentation value_representation, Node* value) { if (base_taggedness == kTaggedBase && CanBeTaggedPointer(field_representation)) { Type value_type = NodeProperties::GetType(value); if (field_representation == MachineRepresentation::kTaggedSigned || value_representation == MachineRepresentation::kTaggedSigned) { // Write barriers are only for stores of heap objects. return kNoWriteBarrier; } if (field_type.Is(Type::BooleanOrNullOrUndefined()) || value_type.Is(Type::BooleanOrNullOrUndefined())) { // Write barriers are not necessary when storing true, false, null or // undefined, because these special oddballs are always in the root set. return kNoWriteBarrier; } if (value_type.IsHeapConstant()) { RootIndex root_index; const RootsTable& roots_table = jsgraph_->isolate()->roots_table(); if (roots_table.IsRootHandle(value_type.AsHeapConstant()->Value(), &root_index)) { if (RootsTable::IsImmortalImmovable(root_index)) { // Write barriers are unnecessary for immortal immovable roots. return kNoWriteBarrier; } } } if (field_representation == MachineRepresentation::kTaggedPointer || value_representation == MachineRepresentation::kTaggedPointer) { // Write barriers for heap objects are cheaper. return kPointerWriteBarrier; } NumberMatcher m(value); if (m.HasValue()) { if (IsSmiDouble(m.Value())) { // Storing a smi doesn't need a write barrier. return kNoWriteBarrier; } // The NumberConstant will be represented as HeapNumber. return kPointerWriteBarrier; } return kFullWriteBarrier; } return kNoWriteBarrier; } WriteBarrierKind WriteBarrierKindFor( BaseTaggedness base_taggedness, MachineRepresentation field_representation, int field_offset, Type field_type, MachineRepresentation value_representation, Node* value) { WriteBarrierKind write_barrier_kind = WriteBarrierKindFor(base_taggedness, field_representation, field_type, value_representation, value); if (write_barrier_kind != kNoWriteBarrier) { if (base_taggedness == kTaggedBase && field_offset == HeapObject::kMapOffset) { write_barrier_kind = kMapWriteBarrier; } } return write_barrier_kind; } Graph* graph() const { return jsgraph_->graph(); } CommonOperatorBuilder* common() const { return jsgraph_->common(); } SimplifiedOperatorBuilder* simplified() const { return jsgraph_->simplified(); } void LowerToCheckedInt32Mul(Node* node, Truncation truncation, Type input0_type, Type input1_type) { // If one of the inputs is positive and/or truncation is being applied, // there is no need to return -0. CheckForMinusZeroMode mz_mode = truncation.IdentifiesZeroAndMinusZero() || IsSomePositiveOrderedNumber(input0_type) || IsSomePositiveOrderedNumber(input1_type) ? CheckForMinusZeroMode::kDontCheckForMinusZero : CheckForMinusZeroMode::kCheckForMinusZero; NodeProperties::ChangeOp(node, simplified()->CheckedInt32Mul(mz_mode)); } void ChangeToInt32OverflowOp(Node* node) { NodeProperties::ChangeOp(node, Int32OverflowOp(node)); } void ChangeToUint32OverflowOp(Node* node) { NodeProperties::ChangeOp(node, Uint32OverflowOp(node)); } void VisitSpeculativeIntegerAdditiveOp(Node* node, Truncation truncation, SimplifiedLowering* lowering) { Type left_upper = GetUpperBound(node->InputAt(0)); Type right_upper = GetUpperBound(node->InputAt(1)); if (left_upper.Is(type_cache_->kAdditiveSafeIntegerOrMinusZero) && right_upper.Is(type_cache_->kAdditiveSafeIntegerOrMinusZero)) { // Only eliminate the node if its typing rule can be satisfied, namely // that a safe integer is produced. if (truncation.IsUnused()) return VisitUnused(node); // If we know how to interpret the result or if the users only care // about the low 32-bits, we can truncate to Word32 do a wrapping // addition. if (GetUpperBound(node).Is(Type::Signed32()) || GetUpperBound(node).Is(Type::Unsigned32()) || truncation.IsUsedAsWord32()) { // => Int32Add/Sub VisitWord32TruncatingBinop(node); if (lower()) ChangeToPureOp(node, Int32Op(node)); return; } } // Try to use type feedback. NumberOperationHint hint = NumberOperationHintOf(node->op()); DCHECK(hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32); Type left_feedback_type = TypeOf(node->InputAt(0)); Type right_feedback_type = TypeOf(node->InputAt(1)); // Handle the case when no int32 checks on inputs are necessary (but // an overflow check is needed on the output). Note that we do not // have to do any check if at most one side can be minus zero. For // subtraction we need to handle the case of -0 - 0 properly, since // that can produce -0. Type left_constraint_type = node->opcode() == IrOpcode::kSpeculativeSafeIntegerAdd ? Type::Signed32OrMinusZero() : Type::Signed32(); if (left_upper.Is(left_constraint_type) && right_upper.Is(Type::Signed32OrMinusZero()) && (left_upper.Is(Type::Signed32()) || right_upper.Is(Type::Signed32()))) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32, Type::Signed32()); } else { // If the output's truncation is identify-zeros, we can pass it // along. Moreover, if the operation is addition and we know the // right-hand side is not minus zero, we do not have to distinguish // between 0 and -0. IdentifyZeros left_identify_zeros = truncation.identify_zeros(); if (node->opcode() == IrOpcode::kSpeculativeSafeIntegerAdd && !right_feedback_type.Maybe(Type::MinusZero())) { left_identify_zeros = kIdentifyZeros; } UseInfo left_use = CheckedUseInfoAsWord32FromHint(hint, VectorSlotPair(), left_identify_zeros); // For CheckedInt32Add and CheckedInt32Sub, we don't need to do // a minus zero check for the right hand side, since we already // know that the left hand side is a proper Signed32 value, // potentially guarded by a check. UseInfo right_use = CheckedUseInfoAsWord32FromHint(hint, VectorSlotPair(), kIdentifyZeros); VisitBinop(node, left_use, right_use, MachineRepresentation::kWord32, Type::Signed32()); } if (lower()) { if (truncation.IsUsedAsWord32() || !CanOverflowSigned32(node->op(), left_feedback_type, right_feedback_type, graph_zone())) { ChangeToPureOp(node, Int32Op(node)); } else { ChangeToInt32OverflowOp(node); } } return; } void VisitSpeculativeAdditiveOp(Node* node, Truncation truncation, SimplifiedLowering* lowering) { if (BothInputsAre(node, type_cache_->kAdditiveSafeIntegerOrMinusZero) && (GetUpperBound(node).Is(Type::Signed32()) || GetUpperBound(node).Is(Type::Unsigned32()) || truncation.IsUsedAsWord32())) { // => Int32Add/Sub VisitWord32TruncatingBinop(node); if (lower()) ChangeToPureOp(node, Int32Op(node)); return; } // default case => Float64Add/Sub VisitBinop(node, UseInfo::CheckedNumberOrOddballAsFloat64(kDistinguishZeros, VectorSlotPair()), MachineRepresentation::kFloat64, Type::Number()); if (lower()) { ChangeToPureOp(node, Float64Op(node)); } return; } void VisitSpeculativeNumberModulus(Node* node, Truncation truncation, SimplifiedLowering* lowering) { if (BothInputsAre(node, Type::Unsigned32OrMinusZeroOrNaN()) && (truncation.IsUsedAsWord32() || NodeProperties::GetType(node).Is(Type::Unsigned32()))) { // => unsigned Uint32Mod VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Uint32Mod(node)); return; } if (BothInputsAre(node, Type::Signed32OrMinusZeroOrNaN()) && (truncation.IsUsedAsWord32() || NodeProperties::GetType(node).Is(Type::Signed32()))) { // => signed Int32Mod VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Int32Mod(node)); return; } // Try to use type feedback. NumberOperationHint hint = NumberOperationHintOf(node->op()); // Handle the case when no uint32 checks on inputs are necessary // (but an overflow check is needed on the output). if (BothInputsAreUnsigned32(node)) { if (hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32, Type::Unsigned32()); if (lower()) ChangeToUint32OverflowOp(node); return; } } // Handle the case when no int32 checks on inputs are necessary // (but an overflow check is needed on the output). if (BothInputsAre(node, Type::Signed32())) { // If both the inputs the feedback are int32, use the overflow op. if (hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32, Type::Signed32()); if (lower()) ChangeToInt32OverflowOp(node); return; } } if (hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32) { // If the result is truncated, we only need to check the inputs. // For the left hand side we just propagate the identify zeros // mode of the {truncation}; and for modulus the sign of the // right hand side doesn't matter anyways, so in particular there's // no observable difference between a 0 and a -0 then. UseInfo const lhs_use = CheckedUseInfoAsWord32FromHint( hint, VectorSlotPair(), truncation.identify_zeros()); UseInfo const rhs_use = CheckedUseInfoAsWord32FromHint( hint, VectorSlotPair(), kIdentifyZeros); if (truncation.IsUsedAsWord32()) { VisitBinop(node, lhs_use, rhs_use, MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, lowering->Int32Mod(node)); } else if (BothInputsAre(node, Type::Unsigned32OrMinusZeroOrNaN())) { VisitBinop(node, lhs_use, rhs_use, MachineRepresentation::kWord32, Type::Unsigned32()); if (lower()) DeferReplacement(node, lowering->Uint32Mod(node)); } else { VisitBinop(node, lhs_use, rhs_use, MachineRepresentation::kWord32, Type::Signed32()); if (lower()) ChangeToInt32OverflowOp(node); } return; } if (TypeOf(node->InputAt(0)).Is(Type::Unsigned32()) && TypeOf(node->InputAt(1)).Is(Type::Unsigned32()) && (truncation.IsUsedAsWord32() || NodeProperties::GetType(node).Is(Type::Unsigned32()))) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32, Type::Number()); if (lower()) DeferReplacement(node, lowering->Uint32Mod(node)); return; } if (TypeOf(node->InputAt(0)).Is(Type::Signed32()) && TypeOf(node->InputAt(1)).Is(Type::Signed32()) && (truncation.IsUsedAsWord32() || NodeProperties::GetType(node).Is(Type::Signed32()))) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32, Type::Number()); if (lower()) DeferReplacement(node, lowering->Int32Mod(node)); return; } // default case => Float64Mod // For the left hand side we just propagate the identify zeros // mode of the {truncation}; and for modulus the sign of the // right hand side doesn't matter anyways, so in particular there's // no observable difference between a 0 and a -0 then. UseInfo const lhs_use = UseInfo::CheckedNumberOrOddballAsFloat64( truncation.identify_zeros(), VectorSlotPair()); UseInfo const rhs_use = UseInfo::CheckedNumberOrOddballAsFloat64( kIdentifyZeros, VectorSlotPair()); VisitBinop(node, lhs_use, rhs_use, MachineRepresentation::kFloat64, Type::Number()); if (lower()) ChangeToPureOp(node, Float64Op(node)); return; } void InsertUnreachableIfNecessary(Node* node) { DCHECK(lower()); // If the node is effectful and it produces an impossible value, then we // insert Unreachable node after it. if (node->op()->ValueOutputCount() > 0 && node->op()->EffectOutputCount() > 0 && node->opcode() != IrOpcode::kUnreachable && TypeOf(node).IsNone()) { Node* control = (node->op()->ControlOutputCount() == 0) ? NodeProperties::GetControlInput(node, 0) : NodeProperties::FindSuccessfulControlProjection(node); Node* unreachable = graph()->NewNode(common()->Unreachable(), node, control); // Insert unreachable node and replace all the effect uses of the {node} // with the new unreachable node. for (Edge edge : node->use_edges()) { if (!NodeProperties::IsEffectEdge(edge)) continue; // Make sure to not overwrite the unreachable node's input. That would // create a cycle. if (edge.from() == unreachable) continue; // Avoid messing up the exceptional path. if (edge.from()->opcode() == IrOpcode::kIfException) { DCHECK(!node->op()->HasProperty(Operator::kNoThrow)); DCHECK_EQ(NodeProperties::GetControlInput(edge.from()), node); continue; } edge.UpdateTo(unreachable); } } } void VisitCheckBounds(Node* node, SimplifiedLowering* lowering) { CheckParameters const& p = CheckParametersOf(node->op()); Type const index_type = TypeOf(node->InputAt(0)); Type const length_type = TypeOf(node->InputAt(1)); if (length_type.Is(Type::Unsigned31())) { if (index_type.Is(Type::Integral32OrMinusZero())) { // Map -0 to 0, and the values in the [-2^31,-1] range to the // [2^31,2^32-1] range, which will be considered out-of-bounds // as well, because the {length_type} is limited to Unsigned31. VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) { CheckBoundsParameters::Mode mode = CheckBoundsParameters::kDeoptOnOutOfBounds; if (lowering->poisoning_level_ == PoisoningMitigationLevel::kDontPoison && (index_type.IsNone() || length_type.IsNone() || (index_type.Min() >= 0.0 && index_type.Max() < length_type.Min()))) { // The bounds check is redundant if we already know that // the index is within the bounds of [0.0, length[. mode = CheckBoundsParameters::kAbortOnOutOfBounds; } NodeProperties::ChangeOp( node, simplified()->CheckedUint32Bounds(p.feedback(), mode)); } } else { VisitBinop( node, UseInfo::CheckedSigned32AsWord32(kIdentifyZeros, p.feedback()), UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) { NodeProperties::ChangeOp( node, simplified()->CheckedUint32Bounds( p.feedback(), CheckBoundsParameters::kDeoptOnOutOfBounds)); } } } else { DCHECK(length_type.Is(type_cache_->kPositiveSafeInteger)); VisitBinop(node, UseInfo::CheckedSigned64AsWord64(kIdentifyZeros, p.feedback()), UseInfo::Word64(), MachineRepresentation::kWord64); if (lower()) { NodeProperties::ChangeOp( node, simplified()->CheckedUint64Bounds(p.feedback())); } } } // Dispatching routine for visiting the node {node} with the usage {use}. // Depending on the operator, propagate new usage info to the inputs. void VisitNode(Node* node, Truncation truncation, SimplifiedLowering* lowering) { // Unconditionally eliminate unused pure nodes (only relevant if there's // a pure operation in between two effectful ones, where the last one // is unused). // Note: We must not do this for constants, as they are cached and we // would thus kill the cached {node} during lowering (i.e. replace all // uses with Dead), but at that point some node lowering might have // already taken the constant {node} from the cache (while it was in // a sane state still) and we would afterwards replace that use with // Dead as well. if (node->op()->ValueInputCount() > 0 && node->op()->HasProperty(Operator::kPure) && truncation.IsUnused()) { return VisitUnused(node); } if (lower()) InsertUnreachableIfNecessary(node); switch (node->opcode()) { //------------------------------------------------------------------ // Common operators. //------------------------------------------------------------------ case IrOpcode::kStart: // We use Start as a terminator for the frame state chain, so even // tho Start doesn't really produce a value, we have to say Tagged // here, otherwise the input conversion will fail. return VisitLeaf(node, MachineRepresentation::kTagged); case IrOpcode::kParameter: // TODO(titzer): use representation from linkage. return VisitUnop(node, UseInfo::None(), MachineRepresentation::kTagged); case IrOpcode::kInt32Constant: return VisitLeaf(node, MachineRepresentation::kWord32); case IrOpcode::kInt64Constant: return VisitLeaf(node, MachineRepresentation::kWord64); case IrOpcode::kExternalConstant: return VisitLeaf(node, MachineType::PointerRepresentation()); case IrOpcode::kNumberConstant: { double const value = OpParameter<double>(node->op()); int value_as_int; if (DoubleToSmiInteger(value, &value_as_int)) { VisitLeaf(node, MachineRepresentation::kTaggedSigned); if (lower()) { intptr_t smi = bit_cast<intptr_t>(Smi::FromInt(value_as_int)); DeferReplacement(node, lowering->jsgraph()->IntPtrConstant(smi)); } return; } VisitLeaf(node, MachineRepresentation::kTagged); return; } case IrOpcode::kHeapConstant: case IrOpcode::kDelayedStringConstant: return VisitLeaf(node, MachineRepresentation::kTaggedPointer); case IrOpcode::kPointerConstant: { VisitLeaf(node, MachineType::PointerRepresentation()); if (lower()) { intptr_t const value = OpParameter<intptr_t>(node->op()); DeferReplacement(node, lowering->jsgraph()->IntPtrConstant(value)); } return; } case IrOpcode::kBranch: { DCHECK(TypeOf(node->InputAt(0)).Is(Type::Boolean())); ProcessInput(node, 0, UseInfo::Bool()); EnqueueInput(node, NodeProperties::FirstControlIndex(node)); return; } case IrOpcode::kSwitch: ProcessInput(node, 0, UseInfo::TruncatingWord32()); EnqueueInput(node, NodeProperties::FirstControlIndex(node)); return; case IrOpcode::kSelect: return VisitSelect(node, truncation, lowering); case IrOpcode::kPhi: return VisitPhi(node, truncation, lowering); case IrOpcode::kCall: return VisitCall(node, lowering); //------------------------------------------------------------------ // JavaScript operators. //------------------------------------------------------------------ case IrOpcode::kToBoolean: { if (truncation.IsUsedAsBool()) { ProcessInput(node, 0, UseInfo::Bool()); SetOutput(node, MachineRepresentation::kBit); if (lower()) DeferReplacement(node, node->InputAt(0)); } else { VisitInputs(node); SetOutput(node, MachineRepresentation::kTaggedPointer); } return; } case IrOpcode::kJSToNumber: case IrOpcode::kJSToNumberConvertBigInt: case IrOpcode::kJSToNumeric: { VisitInputs(node); // TODO(bmeurer): Optimize somewhat based on input type? if (truncation.IsUsedAsWord32()) { SetOutput(node, MachineRepresentation::kWord32); if (lower()) lowering->DoJSToNumberOrNumericTruncatesToWord32(node, this); } else if (truncation.IsUsedAsFloat64()) { SetOutput(node, MachineRepresentation::kFloat64); if (lower()) lowering->DoJSToNumberOrNumericTruncatesToFloat64(node, this); } else { SetOutput(node, MachineRepresentation::kTagged); } return; } //------------------------------------------------------------------ // Simplified operators. //------------------------------------------------------------------ case IrOpcode::kBooleanNot: { if (lower()) { NodeInfo* input_info = GetInfo(node->InputAt(0)); if (input_info->representation() == MachineRepresentation::kBit) { // BooleanNot(x: kRepBit) => Word32Equal(x, #0) node->AppendInput(jsgraph_->zone(), jsgraph_->Int32Constant(0)); NodeProperties::ChangeOp(node, lowering->machine()->Word32Equal()); } else if (CanBeTaggedPointer(input_info->representation())) { // BooleanNot(x: kRepTagged) => WordEqual(x, #false) node->AppendInput(jsgraph_->zone(), jsgraph_->FalseConstant()); NodeProperties::ChangeOp(node, lowering->machine()->WordEqual()); } else { DCHECK(TypeOf(node->InputAt(0)).IsNone()); DeferReplacement(node, lowering->jsgraph()->Int32Constant(0)); } } else { // No input representation requirement; adapt during lowering. ProcessInput(node, 0, UseInfo::AnyTruncatingToBool()); SetOutput(node, MachineRepresentation::kBit); } return; } case IrOpcode::kNumberEqual: { Type const lhs_type = TypeOf(node->InputAt(0)); Type const rhs_type = TypeOf(node->InputAt(1)); // Regular number comparisons in JavaScript generally identify zeros, // so we always pass kIdentifyZeros for the inputs, and in addition // we can truncate -0 to 0 for otherwise Unsigned32 or Signed32 inputs. // For equality we also handle the case that one side is non-zero, in // which case we allow to truncate NaN to 0 on the other side. if ((lhs_type.Is(Type::Unsigned32OrMinusZero()) && rhs_type.Is(Type::Unsigned32OrMinusZero())) || (lhs_type.Is(Type::Unsigned32OrMinusZeroOrNaN()) && rhs_type.Is(Type::Unsigned32OrMinusZeroOrNaN()) && OneInputCannotBe(node, type_cache_->kZeroish))) { // => unsigned Int32Cmp VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kBit); if (lower()) NodeProperties::ChangeOp(node, Uint32Op(node)); return; } if ((lhs_type.Is(Type::Signed32OrMinusZero()) && rhs_type.Is(Type::Signed32OrMinusZero())) || (lhs_type.Is(Type::Signed32OrMinusZeroOrNaN()) && rhs_type.Is(Type::Signed32OrMinusZeroOrNaN()) && OneInputCannotBe(node, type_cache_->kZeroish))) { // => signed Int32Cmp VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kBit); if (lower()) NodeProperties::ChangeOp(node, Int32Op(node)); return; } // => Float64Cmp VisitBinop(node, UseInfo::TruncatingFloat64(kIdentifyZeros), MachineRepresentation::kBit); if (lower()) NodeProperties::ChangeOp(node, Float64Op(node)); return; } case IrOpcode::kNumberLessThan: case IrOpcode::kNumberLessThanOrEqual: { Type const lhs_type = TypeOf(node->InputAt(0)); Type const rhs_type = TypeOf(node->InputAt(1)); // Regular number comparisons in JavaScript generally identify zeros, // so we always pass kIdentifyZeros for the inputs, and in addition // we can truncate -0 to 0 for otherwise Unsigned32 or Signed32 inputs. if (lhs_type.Is(Type::Unsigned32OrMinusZero()) && rhs_type.Is(Type::Unsigned32OrMinusZero())) { // => unsigned Int32Cmp VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kBit); if (lower()) NodeProperties::ChangeOp(node, Uint32Op(node)); } else if (lhs_type.Is(Type::Signed32OrMinusZero()) && rhs_type.Is(Type::Signed32OrMinusZero())) { // => signed Int32Cmp VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kBit); if (lower()) NodeProperties::ChangeOp(node, Int32Op(node)); } else { // => Float64Cmp VisitBinop(node, UseInfo::TruncatingFloat64(kIdentifyZeros), MachineRepresentation::kBit); if (lower()) NodeProperties::ChangeOp(node, Float64Op(node)); } return; } case IrOpcode::kSpeculativeSafeIntegerAdd: case IrOpcode::kSpeculativeSafeIntegerSubtract: return VisitSpeculativeIntegerAdditiveOp(node, truncation, lowering); case IrOpcode::kSpeculativeNumberAdd: case IrOpcode::kSpeculativeNumberSubtract: return VisitSpeculativeAdditiveOp(node, truncation, lowering); case IrOpcode::kSpeculativeNumberLessThan: case IrOpcode::kSpeculativeNumberLessThanOrEqual: case IrOpcode::kSpeculativeNumberEqual: { Type const lhs_type = TypeOf(node->InputAt(0)); Type const rhs_type = TypeOf(node->InputAt(1)); // Regular number comparisons in JavaScript generally identify zeros, // so we always pass kIdentifyZeros for the inputs, and in addition // we can truncate -0 to 0 for otherwise Unsigned32 or Signed32 inputs. if (lhs_type.Is(Type::Unsigned32OrMinusZero()) && rhs_type.Is(Type::Unsigned32OrMinusZero())) { // => unsigned Int32Cmp VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kBit); if (lower()) ChangeToPureOp(node, Uint32Op(node)); return; } else if (lhs_type.Is(Type::Signed32OrMinusZero()) && rhs_type.Is(Type::Signed32OrMinusZero())) { // => signed Int32Cmp VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kBit); if (lower()) ChangeToPureOp(node, Int32Op(node)); return; } // Try to use type feedback. NumberOperationHint hint = NumberOperationHintOf(node->op()); switch (hint) { case NumberOperationHint::kSigned32: case NumberOperationHint::kSignedSmall: if (propagate()) { VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint, VectorSlotPair(), kIdentifyZeros), MachineRepresentation::kBit); } else if (retype()) { SetOutput(node, MachineRepresentation::kBit, Type::Any()); } else { DCHECK(lower()); Node* lhs = node->InputAt(0); Node* rhs = node->InputAt(1); if (IsNodeRepresentationTagged(lhs) && IsNodeRepresentationTagged(rhs)) { VisitBinop(node, UseInfo::CheckedSignedSmallAsTaggedSigned( VectorSlotPair(), kIdentifyZeros), MachineRepresentation::kBit); ChangeToPureOp( node, changer_->TaggedSignedOperatorFor(node->opcode())); } else { VisitBinop(node, CheckedUseInfoAsWord32FromHint( hint, VectorSlotPair(), kIdentifyZeros), MachineRepresentation::kBit); ChangeToPureOp(node, Int32Op(node)); } } return; case NumberOperationHint::kSignedSmallInputs: // This doesn't make sense for compare operations. UNREACHABLE(); case NumberOperationHint::kNumberOrOddball: // Abstract and strict equality don't perform ToNumber conversions // on Oddballs, so make sure we don't accidentially sneak in a // hint with Oddball feedback here. DCHECK_NE(IrOpcode::kSpeculativeNumberEqual, node->opcode()); V8_FALLTHROUGH; case NumberOperationHint::kNumber: VisitBinop(node, CheckedUseInfoAsFloat64FromHint(hint, VectorSlotPair(), kIdentifyZeros), MachineRepresentation::kBit); if (lower()) ChangeToPureOp(node, Float64Op(node)); return; } UNREACHABLE(); return; } case IrOpcode::kNumberAdd: case IrOpcode::kNumberSubtract: { if (TypeOf(node->InputAt(0)) .Is(type_cache_->kAdditiveSafeIntegerOrMinusZero) && TypeOf(node->InputAt(1)) .Is(type_cache_->kAdditiveSafeIntegerOrMinusZero) && (TypeOf(node).Is(Type::Signed32()) || TypeOf(node).Is(Type::Unsigned32()) || truncation.IsUsedAsWord32())) { // => Int32Add/Sub VisitWord32TruncatingBinop(node); if (lower()) ChangeToPureOp(node, Int32Op(node)); } else if (jsgraph_->machine()->Is64() && BothInputsAre(node, type_cache_->kSafeInteger) && GetUpperBound(node).Is(type_cache_->kSafeInteger)) { // => Int64Add/Sub VisitInt64Binop(node); if (lower()) ChangeToPureOp(node, Int64Op(node)); } else { // => Float64Add/Sub VisitFloat64Binop(node); if (lower()) ChangeToPureOp(node, Float64Op(node)); } return; } case IrOpcode::kSpeculativeNumberMultiply: { if (BothInputsAre(node, Type::Integral32()) && (NodeProperties::GetType(node).Is(Type::Signed32()) || NodeProperties::GetType(node).Is(Type::Unsigned32()) || (truncation.IsUsedAsWord32() && NodeProperties::GetType(node).Is( type_cache_->kSafeIntegerOrMinusZero)))) { // Multiply reduces to Int32Mul if the inputs are integers, and // (a) the output is either known to be Signed32, or // (b) the output is known to be Unsigned32, or // (c) the uses are truncating and the result is in the safe // integer range. VisitWord32TruncatingBinop(node); if (lower()) ChangeToPureOp(node, Int32Op(node)); return; } // Try to use type feedback. NumberOperationHint hint = NumberOperationHintOf(node->op()); Type input0_type = TypeOf(node->InputAt(0)); Type input1_type = TypeOf(node->InputAt(1)); // Handle the case when no int32 checks on inputs are necessary // (but an overflow check is needed on the output). if (BothInputsAre(node, Type::Signed32())) { // If both inputs and feedback are int32, use the overflow op. if (hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32, Type::Signed32()); if (lower()) { LowerToCheckedInt32Mul(node, truncation, input0_type, input1_type); } return; } } if (hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32) { VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint), MachineRepresentation::kWord32, Type::Signed32()); if (lower()) { LowerToCheckedInt32Mul(node, truncation, input0_type, input1_type); } return; } // Checked float64 x float64 => float64 VisitBinop(node, UseInfo::CheckedNumberOrOddballAsFloat64(kDistinguishZeros, VectorSlotPair()), MachineRepresentation::kFloat64, Type::Number()); if (lower()) ChangeToPureOp(node, Float64Op(node)); return; } case IrOpcode::kNumberMultiply: { if (TypeOf(node->InputAt(0)).Is(Type::Integral32()) && TypeOf(node->InputAt(1)).Is(Type::Integral32()) && (TypeOf(node).Is(Type::Signed32()) || TypeOf(node).Is(Type::Unsigned32()) || (truncation.IsUsedAsWord32() && TypeOf(node).Is(type_cache_->kSafeIntegerOrMinusZero)))) { // Multiply reduces to Int32Mul if the inputs are integers, and // (a) the output is either known to be Signed32, or // (b) the output is known to be Unsigned32, or // (c) the uses are truncating and the result is in the safe // integer range. VisitWord32TruncatingBinop(node); if (lower()) ChangeToPureOp(node, Int32Op(node)); return; } // Number x Number => Float64Mul VisitFloat64Binop(node); if (lower()) ChangeToPureOp(node, Float64Op(node)); return; } case IrOpcode::kSpeculativeNumberDivide: { if (BothInputsAreUnsigned32(node) && truncation.IsUsedAsWord32()) { // => unsigned Uint32Div VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Uint32Div(node)); return; } if (BothInputsAreSigned32(node)) { if (NodeProperties::GetType(node).Is(Type::Signed32())) { // => signed Int32Div VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Int32Div(node)); return; } if (truncation.IsUsedAsWord32()) { // => signed Int32Div VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Int32Div(node)); return; } } // Try to use type feedback. NumberOperationHint hint = NumberOperationHintOf(node->op()); // Handle the case when no uint32 checks on inputs are necessary // (but an overflow check is needed on the output). if (BothInputsAreUnsigned32(node)) { if (hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32, Type::Unsigned32()); if (lower()) ChangeToUint32OverflowOp(node); return; } } // Handle the case when no int32 checks on inputs are necessary // (but an overflow check is needed on the output). if (BothInputsAreSigned32(node)) { // If both the inputs the feedback are int32, use the overflow op. if (hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32) { VisitBinop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32, Type::Signed32()); if (lower()) ChangeToInt32OverflowOp(node); return; } } if (hint == NumberOperationHint::kSigned32 || hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSignedSmallInputs) { // If the result is truncated, we only need to check the inputs. if (truncation.IsUsedAsWord32()) { VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, lowering->Int32Div(node)); return; } else if (hint != NumberOperationHint::kSignedSmallInputs) { VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint), MachineRepresentation::kWord32, Type::Signed32()); if (lower()) ChangeToInt32OverflowOp(node); return; } } // default case => Float64Div VisitBinop(node, UseInfo::CheckedNumberOrOddballAsFloat64(kDistinguishZeros, VectorSlotPair()), MachineRepresentation::kFloat64, Type::Number()); if (lower()) ChangeToPureOp(node, Float64Op(node)); return; } case IrOpcode::kNumberDivide: { if (TypeOf(node->InputAt(0)).Is(Type::Unsigned32()) && TypeOf(node->InputAt(1)).Is(Type::Unsigned32()) && (truncation.IsUsedAsWord32() || TypeOf(node).Is(Type::Unsigned32()))) { // => unsigned Uint32Div VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Uint32Div(node)); return; } if (TypeOf(node->InputAt(0)).Is(Type::Signed32()) && TypeOf(node->InputAt(1)).Is(Type::Signed32()) && (truncation.IsUsedAsWord32() || TypeOf(node).Is(Type::Signed32()))) { // => signed Int32Div VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Int32Div(node)); return; } // Number x Number => Float64Div VisitFloat64Binop(node); if (lower()) ChangeToPureOp(node, Float64Op(node)); return; } case IrOpcode::kSpeculativeNumberModulus: return VisitSpeculativeNumberModulus(node, truncation, lowering); case IrOpcode::kNumberModulus: { Type const lhs_type = TypeOf(node->InputAt(0)); Type const rhs_type = TypeOf(node->InputAt(1)); if ((lhs_type.Is(Type::Unsigned32OrMinusZeroOrNaN()) && rhs_type.Is(Type::Unsigned32OrMinusZeroOrNaN())) && (truncation.IsUsedAsWord32() || TypeOf(node).Is(Type::Unsigned32()))) { // => unsigned Uint32Mod VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Uint32Mod(node)); return; } if ((lhs_type.Is(Type::Signed32OrMinusZeroOrNaN()) && rhs_type.Is(Type::Signed32OrMinusZeroOrNaN())) && (truncation.IsUsedAsWord32() || TypeOf(node).Is(Type::Signed32()) || (truncation.IdentifiesZeroAndMinusZero() && TypeOf(node).Is(Type::Signed32OrMinusZero())))) { // => signed Int32Mod VisitWord32TruncatingBinop(node); if (lower()) DeferReplacement(node, lowering->Int32Mod(node)); return; } // => Float64Mod // For the left hand side we just propagate the identify zeros // mode of the {truncation}; and for modulus the sign of the // right hand side doesn't matter anyways, so in particular there's // no observable difference between a 0 and a -0 then. UseInfo const lhs_use = UseInfo::TruncatingFloat64(truncation.identify_zeros()); UseInfo const rhs_use = UseInfo::TruncatingFloat64(kIdentifyZeros); VisitBinop(node, lhs_use, rhs_use, MachineRepresentation::kFloat64); if (lower()) ChangeToPureOp(node, Float64Op(node)); return; } case IrOpcode::kNumberBitwiseOr: case IrOpcode::kNumberBitwiseXor: case IrOpcode::kNumberBitwiseAnd: { VisitWord32TruncatingBinop(node); if (lower()) NodeProperties::ChangeOp(node, Int32Op(node)); return; } case IrOpcode::kSpeculativeNumberBitwiseOr: case IrOpcode::kSpeculativeNumberBitwiseXor: case IrOpcode::kSpeculativeNumberBitwiseAnd: VisitSpeculativeInt32Binop(node); if (lower()) { ChangeToPureOp(node, Int32Op(node)); } return; case IrOpcode::kNumberShiftLeft: { Type rhs_type = GetUpperBound(node->InputAt(1)); VisitBinop(node, UseInfo::TruncatingWord32(), UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Shl()); } return; } case IrOpcode::kSpeculativeNumberShiftLeft: { if (BothInputsAre(node, Type::NumberOrOddball())) { Type rhs_type = GetUpperBound(node->InputAt(1)); VisitBinop(node, UseInfo::TruncatingWord32(), UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Shl()); } return; } NumberOperationHint hint = NumberOperationHintOf(node->op()); Type rhs_type = GetUpperBound(node->InputAt(1)); VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint), MachineRepresentation::kWord32, Type::Signed32()); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Shl()); } return; } case IrOpcode::kNumberShiftRight: { Type rhs_type = GetUpperBound(node->InputAt(1)); VisitBinop(node, UseInfo::TruncatingWord32(), UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Sar()); } return; } case IrOpcode::kSpeculativeNumberShiftRight: { if (BothInputsAre(node, Type::NumberOrOddball())) { Type rhs_type = GetUpperBound(node->InputAt(1)); VisitBinop(node, UseInfo::TruncatingWord32(), UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Sar()); } return; } NumberOperationHint hint = NumberOperationHintOf(node->op()); Type rhs_type = GetUpperBound(node->InputAt(1)); VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint), MachineRepresentation::kWord32, Type::Signed32()); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Sar()); } return; } case IrOpcode::kNumberShiftRightLogical: { Type rhs_type = GetUpperBound(node->InputAt(1)); VisitBinop(node, UseInfo::TruncatingWord32(), UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Shr()); } return; } case IrOpcode::kSpeculativeNumberShiftRightLogical: { NumberOperationHint hint = NumberOperationHintOf(node->op()); Type rhs_type = GetUpperBound(node->InputAt(1)); if (rhs_type.Is(type_cache_->kZeroish) && (hint == NumberOperationHint::kSignedSmall || hint == NumberOperationHint::kSigned32) && !truncation.IsUsedAsWord32()) { // The SignedSmall or Signed32 feedback means that the results that we // have seen so far were of type Unsigned31. We speculate that this // will continue to hold. Moreover, since the RHS is 0, the result // will just be the (converted) LHS. VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint), MachineRepresentation::kWord32, Type::Unsigned31()); if (lower()) { node->RemoveInput(1); NodeProperties::ChangeOp( node, simplified()->CheckedUint32ToInt32(VectorSlotPair())); } return; } if (BothInputsAre(node, Type::NumberOrOddball())) { VisitBinop(node, UseInfo::TruncatingWord32(), UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Shr()); } return; } VisitBinop(node, CheckedUseInfoAsWord32FromHint(hint), MachineRepresentation::kWord32, Type::Unsigned32()); if (lower()) { MaskShiftOperand(node, rhs_type); ChangeToPureOp(node, lowering->machine()->Word32Shr()); } return; } case IrOpcode::kNumberAbs: { // NumberAbs maps both 0 and -0 to 0, so we can generally // pass the kIdentifyZeros truncation to its input, and // choose to ignore minus zero in all cases. Type const input_type = TypeOf(node->InputAt(0)); if (input_type.Is(Type::Unsigned32OrMinusZero())) { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, node->InputAt(0)); } else if (input_type.Is(Type::Signed32OrMinusZero())) { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, lowering->Int32Abs(node)); } else if (input_type.Is(type_cache_->kPositiveIntegerOrNaN)) { VisitUnop(node, UseInfo::TruncatingFloat64(kIdentifyZeros), MachineRepresentation::kFloat64); if (lower()) DeferReplacement(node, node->InputAt(0)); } else { VisitUnop(node, UseInfo::TruncatingFloat64(kIdentifyZeros), MachineRepresentation::kFloat64); if (lower()) NodeProperties::ChangeOp(node, Float64Op(node)); } return; } case IrOpcode::kNumberClz32: { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) NodeProperties::ChangeOp(node, Uint32Op(node)); return; } case IrOpcode::kNumberImul: { VisitBinop(node, UseInfo::TruncatingWord32(), UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) NodeProperties::ChangeOp(node, Uint32Op(node)); return; } case IrOpcode::kNumberFround: { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat32); if (lower()) NodeProperties::ChangeOp(node, Float64Op(node)); return; } case IrOpcode::kNumberMax: { // It is safe to use the feedback types for left and right hand side // here, since we can only narrow those types and thus we can only // promise a more specific truncation. // For NumberMax we generally propagate whether the truncation // identifies zeros to the inputs, and we choose to ignore minus // zero in those cases. Type const lhs_type = TypeOf(node->InputAt(0)); Type const rhs_type = TypeOf(node->InputAt(1)); if ((lhs_type.Is(Type::Unsigned32()) && rhs_type.Is(Type::Unsigned32())) || (lhs_type.Is(Type::Unsigned32OrMinusZero()) && rhs_type.Is(Type::Unsigned32OrMinusZero()) && truncation.IdentifiesZeroAndMinusZero())) { VisitWord32TruncatingBinop(node); if (lower()) { lowering->DoMax(node, lowering->machine()->Uint32LessThan(), MachineRepresentation::kWord32); } } else if ((lhs_type.Is(Type::Signed32()) && rhs_type.Is(Type::Signed32())) || (lhs_type.Is(Type::Signed32OrMinusZero()) && rhs_type.Is(Type::Signed32OrMinusZero()) && truncation.IdentifiesZeroAndMinusZero())) { VisitWord32TruncatingBinop(node); if (lower()) { lowering->DoMax(node, lowering->machine()->Int32LessThan(), MachineRepresentation::kWord32); } } else if (jsgraph_->machine()->Is64() && lhs_type.Is(type_cache_->kSafeInteger) && rhs_type.Is(type_cache_->kSafeInteger)) { VisitInt64Binop(node); if (lower()) { lowering->DoMax(node, lowering->machine()->Int64LessThan(), MachineRepresentation::kWord64); } } else { VisitBinop(node, UseInfo::TruncatingFloat64(truncation.identify_zeros()), MachineRepresentation::kFloat64); if (lower()) { // If the right hand side is not NaN, and the left hand side // is not NaN (or -0 if the difference between the zeros is // observed), we can do a simple floating point comparison here. if (lhs_type.Is(truncation.IdentifiesZeroAndMinusZero() ? Type::OrderedNumber() : Type::PlainNumber()) && rhs_type.Is(Type::OrderedNumber())) { lowering->DoMax(node, lowering->machine()->Float64LessThan(), MachineRepresentation::kFloat64); } else { NodeProperties::ChangeOp(node, Float64Op(node)); } } } return; } case IrOpcode::kNumberMin: { // It is safe to use the feedback types for left and right hand side // here, since we can only narrow those types and thus we can only // promise a more specific truncation. // For NumberMin we generally propagate whether the truncation // identifies zeros to the inputs, and we choose to ignore minus // zero in those cases. Type const lhs_type = TypeOf(node->InputAt(0)); Type const rhs_type = TypeOf(node->InputAt(1)); if ((lhs_type.Is(Type::Unsigned32()) && rhs_type.Is(Type::Unsigned32())) || (lhs_type.Is(Type::Unsigned32OrMinusZero()) && rhs_type.Is(Type::Unsigned32OrMinusZero()) && truncation.IdentifiesZeroAndMinusZero())) { VisitWord32TruncatingBinop(node); if (lower()) { lowering->DoMin(node, lowering->machine()->Uint32LessThan(), MachineRepresentation::kWord32); } } else if ((lhs_type.Is(Type::Signed32()) && rhs_type.Is(Type::Signed32())) || (lhs_type.Is(Type::Signed32OrMinusZero()) && rhs_type.Is(Type::Signed32OrMinusZero()) && truncation.IdentifiesZeroAndMinusZero())) { VisitWord32TruncatingBinop(node); if (lower()) { lowering->DoMin(node, lowering->machine()->Int32LessThan(), MachineRepresentation::kWord32); } } else if (jsgraph_->machine()->Is64() && lhs_type.Is(type_cache_->kSafeInteger) && rhs_type.Is(type_cache_->kSafeInteger)) { VisitInt64Binop(node); if (lower()) { lowering->DoMin(node, lowering->machine()->Int64LessThan(), MachineRepresentation::kWord64); } } else { VisitBinop(node, UseInfo::TruncatingFloat64(truncation.identify_zeros()), MachineRepresentation::kFloat64); if (lower()) { // If the left hand side is not NaN, and the right hand side // is not NaN (or -0 if the difference between the zeros is // observed), we can do a simple floating point comparison here. if (lhs_type.Is(Type::OrderedNumber()) && rhs_type.Is(truncation.IdentifiesZeroAndMinusZero() ? Type::OrderedNumber() : Type::PlainNumber())) { lowering->DoMin(node, lowering->machine()->Float64LessThanOrEqual(), MachineRepresentation::kFloat64); } else { NodeProperties::ChangeOp(node, Float64Op(node)); } } } return; } case IrOpcode::kNumberAtan2: case IrOpcode::kNumberPow: { VisitBinop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) NodeProperties::ChangeOp(node, Float64Op(node)); return; } case IrOpcode::kNumberCeil: case IrOpcode::kNumberFloor: case IrOpcode::kNumberRound: case IrOpcode::kNumberTrunc: { // For NumberCeil, NumberFloor, NumberRound and NumberTrunc we propagate // the zero identification part of the truncation, and we turn them into // no-ops if we figure out (late) that their input is already an // integer, NaN or -0. Type const input_type = TypeOf(node->InputAt(0)); VisitUnop(node, UseInfo::TruncatingFloat64(truncation.identify_zeros()), MachineRepresentation::kFloat64); if (lower()) { if (input_type.Is(type_cache_->kIntegerOrMinusZeroOrNaN)) { DeferReplacement(node, node->InputAt(0)); } else if (node->opcode() == IrOpcode::kNumberRound) { DeferReplacement(node, lowering->Float64Round(node)); } else { NodeProperties::ChangeOp(node, Float64Op(node)); } } return; } case IrOpcode::kNumberAcos: case IrOpcode::kNumberAcosh: case IrOpcode::kNumberAsin: case IrOpcode::kNumberAsinh: case IrOpcode::kNumberAtan: case IrOpcode::kNumberAtanh: case IrOpcode::kNumberCos: case IrOpcode::kNumberCosh: case IrOpcode::kNumberExp: case IrOpcode::kNumberExpm1: case IrOpcode::kNumberLog: case IrOpcode::kNumberLog1p: case IrOpcode::kNumberLog2: case IrOpcode::kNumberLog10: case IrOpcode::kNumberCbrt: case IrOpcode::kNumberSin: case IrOpcode::kNumberSinh: case IrOpcode::kNumberTan: case IrOpcode::kNumberTanh: { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) NodeProperties::ChangeOp(node, Float64Op(node)); return; } case IrOpcode::kNumberSign: { if (InputIs(node, Type::Signed32())) { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, lowering->Int32Sign(node)); } else { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) DeferReplacement(node, lowering->Float64Sign(node)); } return; } case IrOpcode::kNumberSilenceNaN: { Type const input_type = TypeOf(node->InputAt(0)); if (input_type.Is(Type::OrderedNumber())) { // No need to silence anything if the input cannot be NaN. VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) DeferReplacement(node, node->InputAt(0)); } else { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) NodeProperties::ChangeOp(node, Float64Op(node)); } return; } case IrOpcode::kNumberSqrt: { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) NodeProperties::ChangeOp(node, Float64Op(node)); return; } case IrOpcode::kNumberToBoolean: { // For NumberToBoolean we don't care whether the input is 0 or // -0, since both of them are mapped to false anyways, so we // can generally pass kIdentifyZeros truncation. Type const input_type = TypeOf(node->InputAt(0)); if (input_type.Is(Type::Integral32OrMinusZeroOrNaN())) { // 0, -0 and NaN all map to false, so we can safely truncate // all of them to zero here. VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kBit); if (lower()) lowering->DoIntegral32ToBit(node); } else if (input_type.Is(Type::OrderedNumber())) { VisitUnop(node, UseInfo::TruncatingFloat64(kIdentifyZeros), MachineRepresentation::kBit); if (lower()) lowering->DoOrderedNumberToBit(node); } else { VisitUnop(node, UseInfo::TruncatingFloat64(kIdentifyZeros), MachineRepresentation::kBit); if (lower()) lowering->DoNumberToBit(node); } return; } case IrOpcode::kNumberToInt32: { // Just change representation if necessary. VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, node->InputAt(0)); return; } case IrOpcode::kNumberToString: { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kNumberToUint32: { // Just change representation if necessary. VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, node->InputAt(0)); return; } case IrOpcode::kNumberToUint8Clamped: { Type const input_type = TypeOf(node->InputAt(0)); if (input_type.Is(type_cache_->kUint8OrMinusZeroOrNaN)) { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, node->InputAt(0)); } else if (input_type.Is(Type::Unsigned32OrMinusZeroOrNaN())) { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) lowering->DoUnsigned32ToUint8Clamped(node); } else if (input_type.Is(Type::Signed32OrMinusZeroOrNaN())) { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) lowering->DoSigned32ToUint8Clamped(node); } else if (input_type.Is(type_cache_->kIntegerOrMinusZeroOrNaN)) { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) lowering->DoIntegerToUint8Clamped(node); } else { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) lowering->DoNumberToUint8Clamped(node); } return; } case IrOpcode::kReferenceEqual: { VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); if (lower()) { NodeProperties::ChangeOp(node, lowering->machine()->WordEqual()); } return; } case IrOpcode::kSameValue: { if (truncation.IsUnused()) return VisitUnused(node); VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kTypeOf: { return VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); } case IrOpcode::kNewConsString: { ProcessInput(node, 0, UseInfo::TruncatingWord32()); // length ProcessInput(node, 1, UseInfo::AnyTagged()); // first ProcessInput(node, 2, UseInfo::AnyTagged()); // second SetOutput(node, MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kStringConcat: { // TODO(turbofan): We currently depend on having this first length input // to make sure that the overflow check is properly scheduled before the // actual string concatenation. We should also use the length to pass it // to the builtin or decide in optimized code how to construct the // resulting string (i.e. cons string or sequential string). ProcessInput(node, 0, UseInfo::TaggedSigned()); // length ProcessInput(node, 1, UseInfo::AnyTagged()); // first ProcessInput(node, 2, UseInfo::AnyTagged()); // second SetOutput(node, MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kStringEqual: case IrOpcode::kStringLessThan: case IrOpcode::kStringLessThanOrEqual: { return VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); } case IrOpcode::kStringCharCodeAt: { return VisitBinop(node, UseInfo::AnyTagged(), UseInfo::Word(), MachineRepresentation::kWord32); } case IrOpcode::kStringCodePointAt: { return VisitBinop(node, UseInfo::AnyTagged(), UseInfo::Word(), MachineRepresentation::kTaggedSigned); } case IrOpcode::kStringFromSingleCharCode: { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kStringFromSingleCodePoint: { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kStringIndexOf: { ProcessInput(node, 0, UseInfo::AnyTagged()); ProcessInput(node, 1, UseInfo::AnyTagged()); ProcessInput(node, 2, UseInfo::TaggedSigned()); SetOutput(node, MachineRepresentation::kTaggedSigned); return; } case IrOpcode::kStringLength: { // TODO(bmeurer): The input representation should be TaggedPointer. // Fix this once we have a dedicated StringConcat/JSStringAdd // operator, which marks it's output as TaggedPointer properly. VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kWord32); return; } case IrOpcode::kStringSubstring: { ProcessInput(node, 0, UseInfo::AnyTagged()); ProcessInput(node, 1, UseInfo::TruncatingWord32()); ProcessInput(node, 2, UseInfo::TruncatingWord32()); ProcessRemainingInputs(node, 3); SetOutput(node, MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kStringToLowerCaseIntl: case IrOpcode::kStringToUpperCaseIntl: { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kCheckBounds: return VisitCheckBounds(node, lowering); case IrOpcode::kPoisonIndex: { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); return; } case IrOpcode::kCheckHeapObject: { if (InputCannotBe(node, Type::SignedSmall())) { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); } else { VisitUnop(node, UseInfo::CheckedHeapObjectAsTaggedPointer(VectorSlotPair()), MachineRepresentation::kTaggedPointer); } if (lower()) DeferReplacement(node, node->InputAt(0)); return; } case IrOpcode::kCheckIf: { ProcessInput(node, 0, UseInfo::Bool()); ProcessRemainingInputs(node, 1); SetOutput(node, MachineRepresentation::kNone); return; } case IrOpcode::kCheckInternalizedString: { VisitCheck(node, Type::InternalizedString(), lowering); return; } case IrOpcode::kCheckNumber: { Type const input_type = TypeOf(node->InputAt(0)); if (input_type.Is(Type::Number())) { VisitNoop(node, truncation); } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged); } return; } case IrOpcode::kCheckReceiver: { VisitCheck(node, Type::Receiver(), lowering); return; } case IrOpcode::kCheckReceiverOrNullOrUndefined: { VisitCheck(node, Type::ReceiverOrNullOrUndefined(), lowering); return; } case IrOpcode::kCheckSmi: { const CheckParameters& params = CheckParametersOf(node->op()); if (SmiValuesAre32Bits() && truncation.IsUsedAsWord32()) { VisitUnop(node, UseInfo::CheckedSignedSmallAsWord32(kDistinguishZeros, params.feedback()), MachineRepresentation::kWord32); } else { VisitUnop( node, UseInfo::CheckedSignedSmallAsTaggedSigned(params.feedback()), MachineRepresentation::kTaggedSigned); } if (lower()) DeferReplacement(node, node->InputAt(0)); return; } case IrOpcode::kCheckString: { const CheckParameters& params = CheckParametersOf(node->op()); if (InputIs(node, Type::String())) { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); if (lower()) DeferReplacement(node, node->InputAt(0)); } else { VisitUnop( node, UseInfo::CheckedHeapObjectAsTaggedPointer(params.feedback()), MachineRepresentation::kTaggedPointer); } return; } case IrOpcode::kCheckSymbol: { VisitCheck(node, Type::Symbol(), lowering); return; } case IrOpcode::kAllocate: { ProcessInput(node, 0, UseInfo::Word()); ProcessRemainingInputs(node, 1); SetOutput(node, MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kLoadMessage: { if (truncation.IsUnused()) return VisitUnused(node); VisitUnop(node, UseInfo::Word(), MachineRepresentation::kTagged); return; } case IrOpcode::kStoreMessage: { ProcessInput(node, 0, UseInfo::Word()); ProcessInput(node, 1, UseInfo::AnyTagged()); ProcessRemainingInputs(node, 2); SetOutput(node, MachineRepresentation::kNone); return; } case IrOpcode::kLoadFieldByIndex: { if (truncation.IsUnused()) return VisitUnused(node); VisitBinop(node, UseInfo::AnyTagged(), UseInfo::TruncatingWord32(), MachineRepresentation::kTagged); return; } case IrOpcode::kLoadField: { if (truncation.IsUnused()) return VisitUnused(node); FieldAccess access = FieldAccessOf(node->op()); MachineRepresentation const representation = access.machine_type.representation(); VisitUnop(node, UseInfoForBasePointer(access), representation); return; } case IrOpcode::kStoreField: { FieldAccess access = FieldAccessOf(node->op()); Node* value_node = node->InputAt(1); NodeInfo* input_info = GetInfo(value_node); MachineRepresentation field_representation = access.machine_type.representation(); // Convert to Smi if possible, such that we can avoid a write barrier. if (field_representation == MachineRepresentation::kTagged && TypeOf(value_node).Is(Type::SignedSmall())) { field_representation = MachineRepresentation::kTaggedSigned; } WriteBarrierKind write_barrier_kind = WriteBarrierKindFor( access.base_is_tagged, field_representation, access.offset, access.type, input_info->representation(), value_node); ProcessInput(node, 0, UseInfoForBasePointer(access)); ProcessInput(node, 1, TruncatingUseInfoFromRepresentation(field_representation)); ProcessRemainingInputs(node, 2); SetOutput(node, MachineRepresentation::kNone); if (lower()) { if (write_barrier_kind < access.write_barrier_kind) { access.write_barrier_kind = write_barrier_kind; NodeProperties::ChangeOp( node, jsgraph_->simplified()->StoreField(access)); } } return; } case IrOpcode::kLoadElement: { if (truncation.IsUnused()) return VisitUnused(node); ElementAccess access = ElementAccessOf(node->op()); VisitBinop(node, UseInfoForBasePointer(access), UseInfo::Word(), access.machine_type.representation()); return; } case IrOpcode::kLoadStackArgument: { if (truncation.IsUnused()) return VisitUnused(node); VisitBinop(node, UseInfo::Word(), MachineRepresentation::kTagged); return; } case IrOpcode::kStoreElement: { ElementAccess access = ElementAccessOf(node->op()); Node* value_node = node->InputAt(2); NodeInfo* input_info = GetInfo(value_node); MachineRepresentation element_representation = access.machine_type.representation(); // Convert to Smi if possible, such that we can avoid a write barrier. if (element_representation == MachineRepresentation::kTagged && TypeOf(value_node).Is(Type::SignedSmall())) { element_representation = MachineRepresentation::kTaggedSigned; } WriteBarrierKind write_barrier_kind = WriteBarrierKindFor( access.base_is_tagged, element_representation, access.type, input_info->representation(), value_node); ProcessInput(node, 0, UseInfoForBasePointer(access)); // base ProcessInput(node, 1, UseInfo::Word()); // index ProcessInput(node, 2, TruncatingUseInfoFromRepresentation( element_representation)); // value ProcessRemainingInputs(node, 3); SetOutput(node, MachineRepresentation::kNone); if (lower()) { if (write_barrier_kind < access.write_barrier_kind) { access.write_barrier_kind = write_barrier_kind; NodeProperties::ChangeOp( node, jsgraph_->simplified()->StoreElement(access)); } } return; } case IrOpcode::kNumberIsFloat64Hole: { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); return; } case IrOpcode::kTransitionAndStoreElement: { Type value_type = TypeOf(node->InputAt(2)); ProcessInput(node, 0, UseInfo::AnyTagged()); // array ProcessInput(node, 1, UseInfo::Word()); // index if (value_type.Is(Type::SignedSmall())) { ProcessInput(node, 2, UseInfo::TruncatingWord32()); // value if (lower()) { NodeProperties::ChangeOp(node, simplified()->StoreSignedSmallElement()); } } else if (value_type.Is(Type::Number())) { ProcessInput(node, 2, UseInfo::TruncatingFloat64()); // value if (lower()) { Handle<Map> double_map = DoubleMapParameterOf(node->op()); NodeProperties::ChangeOp( node, simplified()->TransitionAndStoreNumberElement(double_map)); } } else if (value_type.Is(Type::NonNumber())) { ProcessInput(node, 2, UseInfo::AnyTagged()); // value if (lower()) { Handle<Map> fast_map = FastMapParameterOf(node->op()); NodeProperties::ChangeOp( node, simplified()->TransitionAndStoreNonNumberElement( fast_map, value_type)); } } else { ProcessInput(node, 2, UseInfo::AnyTagged()); // value } ProcessRemainingInputs(node, 3); SetOutput(node, MachineRepresentation::kNone); return; } case IrOpcode::kLoadTypedElement: { MachineRepresentation const rep = MachineRepresentationFromArrayType(ExternalArrayTypeOf(node->op())); ProcessInput(node, 0, UseInfo::AnyTagged()); // buffer ProcessInput(node, 1, UseInfo::AnyTagged()); // base pointer ProcessInput(node, 2, UseInfo::Word()); // external pointer ProcessInput(node, 3, UseInfo::Word()); // index ProcessRemainingInputs(node, 4); SetOutput(node, rep); return; } case IrOpcode::kLoadDataViewElement: { MachineRepresentation const rep = MachineRepresentationFromArrayType(ExternalArrayTypeOf(node->op())); ProcessInput(node, 0, UseInfo::AnyTagged()); // buffer ProcessInput(node, 1, UseInfo::Word()); // external pointer ProcessInput(node, 2, UseInfo::Word()); // byte offset ProcessInput(node, 3, UseInfo::Word()); // index ProcessInput(node, 4, UseInfo::Bool()); // little-endian ProcessRemainingInputs(node, 5); SetOutput(node, rep); return; } case IrOpcode::kStoreTypedElement: { MachineRepresentation const rep = MachineRepresentationFromArrayType(ExternalArrayTypeOf(node->op())); ProcessInput(node, 0, UseInfo::AnyTagged()); // buffer ProcessInput(node, 1, UseInfo::AnyTagged()); // base pointer ProcessInput(node, 2, UseInfo::Word()); // external pointer ProcessInput(node, 3, UseInfo::Word()); // index ProcessInput(node, 4, TruncatingUseInfoFromRepresentation(rep)); // value ProcessRemainingInputs(node, 5); SetOutput(node, MachineRepresentation::kNone); return; } case IrOpcode::kStoreDataViewElement: { MachineRepresentation const rep = MachineRepresentationFromArrayType(ExternalArrayTypeOf(node->op())); ProcessInput(node, 0, UseInfo::AnyTagged()); // buffer ProcessInput(node, 1, UseInfo::Word()); // external pointer ProcessInput(node, 2, UseInfo::Word()); // byte offset ProcessInput(node, 3, UseInfo::Word()); // index ProcessInput(node, 4, TruncatingUseInfoFromRepresentation(rep)); // value ProcessInput(node, 5, UseInfo::Bool()); // little-endian ProcessRemainingInputs(node, 6); SetOutput(node, MachineRepresentation::kNone); return; } case IrOpcode::kConvertReceiver: { Type input_type = TypeOf(node->InputAt(0)); VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); if (lower()) { // Try to optimize the {node} based on the input type. if (input_type.Is(Type::Receiver())) { DeferReplacement(node, node->InputAt(0)); } else if (input_type.Is(Type::NullOrUndefined())) { DeferReplacement(node, node->InputAt(1)); } else if (!input_type.Maybe(Type::NullOrUndefined())) { NodeProperties::ChangeOp( node, lowering->simplified()->ConvertReceiver( ConvertReceiverMode::kNotNullOrUndefined)); } } return; } case IrOpcode::kPlainPrimitiveToNumber: { if (InputIs(node, Type::Boolean())) { VisitUnop(node, UseInfo::Bool(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, node->InputAt(0)); } else if (InputIs(node, Type::String())) { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged); if (lower()) { NodeProperties::ChangeOp(node, simplified()->StringToNumber()); } } else if (truncation.IsUsedAsWord32()) { if (InputIs(node, Type::NumberOrOddball())) { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, node->InputAt(0)); } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kWord32); if (lower()) { NodeProperties::ChangeOp(node, simplified()->PlainPrimitiveToWord32()); } } } else if (truncation.IsUsedAsFloat64()) { if (InputIs(node, Type::NumberOrOddball())) { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) DeferReplacement(node, node->InputAt(0)); } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kFloat64); if (lower()) { NodeProperties::ChangeOp(node, simplified()->PlainPrimitiveToFloat64()); } } } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged); } return; } case IrOpcode::kSpeculativeToNumber: { NumberOperationParameters const& p = NumberOperationParametersOf(node->op()); switch (p.hint()) { case NumberOperationHint::kSigned32: case NumberOperationHint::kSignedSmall: case NumberOperationHint::kSignedSmallInputs: VisitUnop(node, CheckedUseInfoAsWord32FromHint(p.hint(), p.feedback()), MachineRepresentation::kWord32, Type::Signed32()); break; case NumberOperationHint::kNumber: case NumberOperationHint::kNumberOrOddball: VisitUnop(node, CheckedUseInfoAsFloat64FromHint(p.hint(), p.feedback()), MachineRepresentation::kFloat64); break; } if (lower()) DeferReplacement(node, node->InputAt(0)); return; } case IrOpcode::kObjectIsArrayBufferView: { // TODO(turbofan): Introduce a Type::ArrayBufferView? VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); return; } case IrOpcode::kObjectIsBigInt: { VisitObjectIs(node, Type::BigInt(), lowering); return; } case IrOpcode::kObjectIsCallable: { VisitObjectIs(node, Type::Callable(), lowering); return; } case IrOpcode::kObjectIsConstructor: { // TODO(turbofan): Introduce a Type::Constructor? VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); return; } case IrOpcode::kObjectIsDetectableCallable: { VisitObjectIs(node, Type::DetectableCallable(), lowering); return; } case IrOpcode::kObjectIsFiniteNumber: { Type const input_type = GetUpperBound(node->InputAt(0)); if (input_type.Is(type_cache_->kSafeInteger)) { VisitUnop(node, UseInfo::None(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(1)); } } else if (!input_type.Maybe(Type::Number())) { VisitUnop(node, UseInfo::Any(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(0)); } } else if (input_type.Is(Type::Number())) { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); if (lower()) { NodeProperties::ChangeOp(node, lowering->simplified()->NumberIsFinite()); } } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); } return; } case IrOpcode::kNumberIsFinite: { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); return; } case IrOpcode::kObjectIsSafeInteger: { Type const input_type = GetUpperBound(node->InputAt(0)); if (input_type.Is(type_cache_->kSafeInteger)) { VisitUnop(node, UseInfo::None(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(1)); } } else if (!input_type.Maybe(Type::Number())) { VisitUnop(node, UseInfo::Any(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(0)); } } else if (input_type.Is(Type::Number())) { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); if (lower()) { NodeProperties::ChangeOp( node, lowering->simplified()->NumberIsSafeInteger()); } } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); } return; } case IrOpcode::kNumberIsSafeInteger: { UNREACHABLE(); } case IrOpcode::kObjectIsInteger: { Type const input_type = GetUpperBound(node->InputAt(0)); if (input_type.Is(type_cache_->kSafeInteger)) { VisitUnop(node, UseInfo::None(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(1)); } } else if (!input_type.Maybe(Type::Number())) { VisitUnop(node, UseInfo::Any(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(0)); } } else if (input_type.Is(Type::Number())) { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); if (lower()) { NodeProperties::ChangeOp(node, lowering->simplified()->NumberIsInteger()); } } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); } return; } case IrOpcode::kNumberIsInteger: { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); return; } case IrOpcode::kObjectIsMinusZero: { Type const input_type = GetUpperBound(node->InputAt(0)); if (input_type.Is(Type::MinusZero())) { VisitUnop(node, UseInfo::None(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(1)); } } else if (!input_type.Maybe(Type::MinusZero())) { VisitUnop(node, UseInfo::Any(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(0)); } } else if (input_type.Is(Type::Number())) { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); if (lower()) { NodeProperties::ChangeOp(node, simplified()->NumberIsMinusZero()); } } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); } return; } case IrOpcode::kObjectIsNaN: { Type const input_type = GetUpperBound(node->InputAt(0)); if (input_type.Is(Type::NaN())) { VisitUnop(node, UseInfo::None(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(1)); } } else if (!input_type.Maybe(Type::NaN())) { VisitUnop(node, UseInfo::Any(), MachineRepresentation::kBit); if (lower()) { DeferReplacement(node, lowering->jsgraph()->Int32Constant(0)); } } else if (input_type.Is(Type::Number())) { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); if (lower()) { NodeProperties::ChangeOp(node, simplified()->NumberIsNaN()); } } else { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); } return; } case IrOpcode::kNumberIsNaN: { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kBit); return; } case IrOpcode::kObjectIsNonCallable: { VisitObjectIs(node, Type::NonCallable(), lowering); return; } case IrOpcode::kObjectIsNumber: { VisitObjectIs(node, Type::Number(), lowering); return; } case IrOpcode::kObjectIsReceiver: { VisitObjectIs(node, Type::Receiver(), lowering); return; } case IrOpcode::kObjectIsSmi: { // TODO(turbofan): Optimize based on input representation. VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); return; } case IrOpcode::kObjectIsString: { VisitObjectIs(node, Type::String(), lowering); return; } case IrOpcode::kObjectIsSymbol: { VisitObjectIs(node, Type::Symbol(), lowering); return; } case IrOpcode::kObjectIsUndetectable: { VisitObjectIs(node, Type::Undetectable(), lowering); return; } case IrOpcode::kArgumentsFrame: { SetOutput(node, MachineType::PointerRepresentation()); return; } case IrOpcode::kArgumentsLength: { VisitUnop(node, UseInfo::Word(), MachineRepresentation::kTaggedSigned); return; } case IrOpcode::kNewDoubleElements: case IrOpcode::kNewSmiOrObjectElements: { VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kNewArgumentsElements: { VisitBinop(node, UseInfo::Word(), UseInfo::TaggedSigned(), MachineRepresentation::kTaggedPointer); return; } case IrOpcode::kCheckFloat64Hole: { Type const input_type = TypeOf(node->InputAt(0)); CheckFloat64HoleMode mode = CheckFloat64HoleParametersOf(node->op()).mode(); if (mode == CheckFloat64HoleMode::kAllowReturnHole) { // If {mode} is allow-return-hole _and_ the {truncation} // identifies NaN and undefined, we can just pass along // the {truncation} and completely wipe the {node}. if (truncation.IsUnused()) return VisitUnused(node); if (truncation.IsUsedAsFloat64()) { VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) DeferReplacement(node, node->InputAt(0)); return; } } VisitUnop(node, UseInfo(MachineRepresentation::kFloat64, Truncation::Any()), MachineRepresentation::kFloat64, Type::Number()); if (lower() && input_type.Is(Type::Number())) { DeferReplacement(node, node->InputAt(0)); } return; } case IrOpcode::kCheckNotTaggedHole: { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged); return; } case IrOpcode::kConvertTaggedHoleToUndefined: { if (InputIs(node, Type::NumberOrOddball()) && truncation.IsUsedAsWord32()) { // Propagate the Word32 truncation. VisitUnop(node, UseInfo::TruncatingWord32(), MachineRepresentation::kWord32); if (lower()) DeferReplacement(node, node->InputAt(0)); } else if (InputIs(node, Type::NumberOrOddball()) && truncation.IsUsedAsFloat64()) { // Propagate the Float64 truncation. VisitUnop(node, UseInfo::TruncatingFloat64(), MachineRepresentation::kFloat64); if (lower()) DeferReplacement(node, node->InputAt(0)); } else if (InputIs(node, Type::NonInternal())) { VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged); if (lower()) DeferReplacement(node, node->InputAt(0)); } else { // TODO(turbofan): Add a (Tagged) truncation that identifies hole // and undefined, i.e. for a[i] === obj cases. VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged); } return; } case IrOpcode::kCheckEqualsSymbol: case IrOpcode::kCheckEqualsInternalizedString: return VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kNone); case IrOpcode::kMapGuard: // Eliminate MapGuard nodes here. return VisitUnused(node); case IrOpcode::kCheckMaps: case IrOpcode::kTransitionElementsKind: { VisitInputs(node); return SetOutput(node, MachineRepresentation::kNone); } case IrOpcode::kCompareMaps: return VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit); case IrOpcode::kEnsureWritableFastElements: return VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedPointer); case IrOpcode::kMaybeGrowFastElements: { Type const index_type = TypeOf(node->InputAt(2)); Type const length_type = TypeOf(node->InputAt(3)); ProcessInput(node, 0, UseInfo::AnyTagged()); // object ProcessInput(node, 1, UseInfo::AnyTagged()); // elements ProcessInput(node, 2, UseInfo::TruncatingWord32()); // index ProcessInput(node, 3, UseInfo::TruncatingWord32()); // length ProcessRemainingInputs(node, 4); SetOutput(node, MachineRepresentation::kTaggedPointer); if (lower()) { // If the index is known to be less than the length (or if // we're in dead code), we know that we don't need to grow // the elements, so we can just remove this operation all // together and replace it with the elements that we have // on the inputs. if (index_type.IsNone() || length_type.IsNone() || index_type.Max() < length_type.Min()) { DeferReplacement(node, node->InputAt(1)); } } return; } case IrOpcode::kDateNow: VisitInputs(node); return SetOutput(node, MachineRepresentation::kTaggedPointer); case IrOpcode::kFrameState: return VisitFrameState(node); case IrOpcode::kStateValues: return VisitStateValues(node); case IrOpcode::kObjectState: return VisitObjectState(node); case IrOpcode::kObjectId: return SetOutput(node, MachineRepresentation::kTaggedPointer); case IrOpcode::kTypeGuard: { // We just get rid of the sigma here, choosing the best representation // for the sigma's type. Type type = TypeOf(node); MachineRepresentation representation = GetOutputInfoForPhi(node, type, truncation); // Here we pretend that the input has the sigma's type for the // conversion. UseInfo use(representation, truncation); if (propagate()) { EnqueueInput(node, 0, use); } else if (lower()) { ConvertInput(node, 0, use, type); } ProcessRemainingInputs(node, 1); SetOutput(node, representation); return; } case IrOpcode::kFinishRegion: VisitInputs(node); // Assume the output is tagged pointer. return SetOutput(node, MachineRepresentation::kTaggedPointer); case IrOpcode::kReturn: VisitReturn(node); // Assume the output is tagged. return SetOutput(node, MachineRepresentation::kTagged); case IrOpcode::kFindOrderedHashMapEntry: { Type const key_type = TypeOf(node->InputAt(1)); if (key_type.Is(Type::Signed32OrMinusZero())) { VisitBinop(node, UseInfo::AnyTagged(), UseInfo::TruncatingWord32(), MachineType::PointerRepresentation()); if (lower()) { NodeProperties::ChangeOp( node, lowering->simplified()->FindOrderedHashMapEntryForInt32Key()); } } else { VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kTaggedSigned); } return; } // Operators with all inputs tagged and no or tagged output have uniform // handling. case IrOpcode::kEnd: case IrOpcode::kIfSuccess: case IrOpcode::kIfException: case IrOpcode::kIfTrue: case IrOpcode::kIfFalse: case IrOpcode::kIfValue: case IrOpcode::kIfDefault: case IrOpcode::kDeoptimize: case IrOpcode::kEffectPhi: case IrOpcode::kTerminate: case IrOpcode::kCheckpoint: case IrOpcode::kLoop: case IrOpcode::kMerge: case IrOpcode::kThrow: case IrOpcode::kBeginRegion: case IrOpcode::kProjection: case IrOpcode::kOsrValue: case IrOpcode::kArgumentsElementsState: case IrOpcode::kArgumentsLengthState: case IrOpcode::kUnreachable: case IrOpcode::kRuntimeAbort: // All JavaScript operators except JSToNumber have uniform handling. #define OPCODE_CASE(name) case IrOpcode::k##name: JS_SIMPLE_BINOP_LIST(OPCODE_CASE) JS_OBJECT_OP_LIST(OPCODE_CASE) JS_CONTEXT_OP_LIST(OPCODE_CASE) JS_OTHER_OP_LIST(OPCODE_CASE) #undef OPCODE_CASE case IrOpcode::kJSBitwiseNot: case IrOpcode::kJSDecrement: case IrOpcode::kJSIncrement: case IrOpcode::kJSNegate: case IrOpcode::kJSToLength: case IrOpcode::kJSToName: case IrOpcode::kJSToObject: case IrOpcode::kJSToString: case IrOpcode::kJSParseInt: VisitInputs(node); // Assume the output is tagged. return SetOutput(node, MachineRepresentation::kTagged); case IrOpcode::kDeadValue: ProcessInput(node, 0, UseInfo::Any()); return SetOutput(node, MachineRepresentation::kNone); default: FATAL( "Representation inference: unsupported opcode %i (%s), node #%i\n.", node->opcode(), node->op()->mnemonic(), node->id()); break; } UNREACHABLE(); } void DeferReplacement(Node* node, Node* replacement) { TRACE("defer replacement #%d:%s with #%d:%s\n", node->id(), node->op()->mnemonic(), replacement->id(), replacement->op()->mnemonic()); // Disconnect the node from effect and control chains, if necessary. if (node->op()->EffectInputCount() > 0) { DCHECK_LT(0, node->op()->ControlInputCount()); // Disconnect the node from effect and control chains. Node* control = NodeProperties::GetControlInput(node); Node* effect = NodeProperties::GetEffectInput(node); ReplaceEffectControlUses(node, effect, control); } replacements_.push_back(node); replacements_.push_back(replacement); node->NullAllInputs(); // Node is now dead. } void Kill(Node* node) { TRACE("killing #%d:%s\n", node->id(), node->op()->mnemonic()); if (node->op()->EffectInputCount() == 1) { DCHECK_LT(0, node->op()->ControlInputCount()); // Disconnect the node from effect and control chains. Node* control = NodeProperties::GetControlInput(node); Node* effect = NodeProperties::GetEffectInput(node); ReplaceEffectControlUses(node, effect, control); } else { DCHECK_EQ(0, node->op()->EffectInputCount()); DCHECK_EQ(0, node->op()->ControlOutputCount()); DCHECK_EQ(0, node->op()->EffectOutputCount()); } node->ReplaceUses(jsgraph_->Dead()); node->NullAllInputs(); // The {node} is now dead. } void PrintOutputInfo(NodeInfo* info) { if (FLAG_trace_representation) { StdoutStream{} << info->representation(); } } void PrintRepresentation(MachineRepresentation rep) { if (FLAG_trace_representation) { StdoutStream{} << rep; } } void PrintTruncation(Truncation truncation) { if (FLAG_trace_representation) { StdoutStream{} << truncation.description() << std::endl; } } void PrintUseInfo(UseInfo info) { if (FLAG_trace_representation) { StdoutStream{} << info.representation() << ":" << info.truncation().description(); } } private: JSGraph* jsgraph_; Zone* zone_; // Temporary zone. size_t const count_; // number of nodes in the graph ZoneVector<NodeInfo> info_; // node id -> usage information #ifdef DEBUG ZoneVector<InputUseInfos> node_input_use_infos_; // Debug information about // requirements on inputs. #endif // DEBUG NodeVector nodes_; // collected nodes NodeVector replacements_; // replacements to be done after lowering Phase phase_; // current phase of algorithm RepresentationChanger* changer_; // for inserting representation changes ZoneQueue<Node*> queue_; // queue for traversing the graph struct NodeState { Node* node; int input_index; }; ZoneStack<NodeState> typing_stack_; // stack for graph typing. // TODO(danno): RepresentationSelector shouldn't know anything about the // source positions table, but must for now since there currently is no other // way to pass down source position information to nodes created during // lowering. Once this phase becomes a vanilla reducer, it should get source // position information via the SourcePositionWrapper like all other reducers. SourcePositionTable* source_positions_; NodeOriginTable* node_origins_; TypeCache const* type_cache_; OperationTyper op_typer_; // helper for the feedback typer NodeInfo* GetInfo(Node* node) { DCHECK(node->id() < count_); return &info_[node->id()]; } Zone* zone() { return zone_; } Zone* graph_zone() { return jsgraph_->zone(); } }; SimplifiedLowering::SimplifiedLowering(JSGraph* jsgraph, JSHeapBroker* broker, Zone* zone, SourcePositionTable* source_positions, NodeOriginTable* node_origins, PoisoningMitigationLevel poisoning_level) : jsgraph_(jsgraph), broker_(broker), zone_(zone), type_cache_(TypeCache::Get()), source_positions_(source_positions), node_origins_(node_origins), poisoning_level_(poisoning_level) {} void SimplifiedLowering::LowerAllNodes() { RepresentationChanger changer(jsgraph(), jsgraph()->isolate()); RepresentationSelector selector(jsgraph(), broker_, zone_, &changer, source_positions_, node_origins_); selector.Run(this); } void SimplifiedLowering::DoJSToNumberOrNumericTruncatesToFloat64( Node* node, RepresentationSelector* selector) { DCHECK(node->opcode() == IrOpcode::kJSToNumber || node->opcode() == IrOpcode::kJSToNumberConvertBigInt || node->opcode() == IrOpcode::kJSToNumeric); Node* value = node->InputAt(0); Node* context = node->InputAt(1); Node* frame_state = node->InputAt(2); Node* effect = node->InputAt(3); Node* control = node->InputAt(4); Node* check0 = graph()->NewNode(simplified()->ObjectIsSmi(), value); Node* branch0 = graph()->NewNode(common()->Branch(BranchHint::kTrue), check0, control); Node* if_true0 = graph()->NewNode(common()->IfTrue(), branch0); Node* etrue0 = effect; Node* vtrue0; { vtrue0 = graph()->NewNode(simplified()->ChangeTaggedSignedToInt32(), value); vtrue0 = graph()->NewNode(machine()->ChangeInt32ToFloat64(), vtrue0); } Node* if_false0 = graph()->NewNode(common()->IfFalse(), branch0); Node* efalse0 = effect; Node* vfalse0; { Operator const* op = node->opcode() == IrOpcode::kJSToNumber ? (node->opcode() == IrOpcode::kJSToNumberConvertBigInt ? ToNumberConvertBigIntOperator() : ToNumberOperator()) : ToNumericOperator(); Node* code = node->opcode() == IrOpcode::kJSToNumber ? ToNumberCode() : (node->opcode() == IrOpcode::kJSToNumberConvertBigInt ? ToNumberConvertBigIntCode() : ToNumericCode()); vfalse0 = efalse0 = if_false0 = graph()->NewNode( op, code, value, context, frame_state, efalse0, if_false0); // Update potential {IfException} uses of {node} to point to the above // stub call node instead. Node* on_exception = nullptr; if (NodeProperties::IsExceptionalCall(node, &on_exception)) { NodeProperties::ReplaceControlInput(on_exception, vfalse0); NodeProperties::ReplaceEffectInput(on_exception, efalse0); if_false0 = graph()->NewNode(common()->IfSuccess(), vfalse0); } Node* check1 = graph()->NewNode(simplified()->ObjectIsSmi(), vfalse0); Node* branch1 = graph()->NewNode(common()->Branch(), check1, if_false0); Node* if_true1 = graph()->NewNode(common()->IfTrue(), branch1); Node* etrue1 = efalse0; Node* vtrue1; { vtrue1 = graph()->NewNode(simplified()->ChangeTaggedSignedToInt32(), vfalse0); vtrue1 = graph()->NewNode(machine()->ChangeInt32ToFloat64(), vtrue1); } Node* if_false1 = graph()->NewNode(common()->IfFalse(), branch1); Node* efalse1 = efalse0; Node* vfalse1; { vfalse1 = efalse1 = graph()->NewNode( simplified()->LoadField(AccessBuilder::ForHeapNumberValue()), efalse0, efalse1, if_false1); } if_false0 = graph()->NewNode(common()->Merge(2), if_true1, if_false1); efalse0 = graph()->NewNode(common()->EffectPhi(2), etrue1, efalse1, if_false0); vfalse0 = graph()->NewNode(common()->Phi(MachineRepresentation::kFloat64, 2), vtrue1, vfalse1, if_false0); } control = graph()->NewNode(common()->Merge(2), if_true0, if_false0); effect = graph()->NewNode(common()->EffectPhi(2), etrue0, efalse0, control); value = graph()->NewNode(common()->Phi(MachineRepresentation::kFloat64, 2), vtrue0, vfalse0, control); // Replace effect and control uses appropriately. for (Edge edge : node->use_edges()) { if (NodeProperties::IsControlEdge(edge)) { if (edge.from()->opcode() == IrOpcode::kIfSuccess) { edge.from()->ReplaceUses(control); edge.from()->Kill(); } else { DCHECK_NE(IrOpcode::kIfException, edge.from()->opcode()); edge.UpdateTo(control); } } else if (NodeProperties::IsEffectEdge(edge)) { edge.UpdateTo(effect); } } selector->DeferReplacement(node, value); } void SimplifiedLowering::DoJSToNumberOrNumericTruncatesToWord32( Node* node, RepresentationSelector* selector) { DCHECK(node->opcode() == IrOpcode::kJSToNumber || node->opcode() == IrOpcode::kJSToNumberConvertBigInt || node->opcode() == IrOpcode::kJSToNumeric); Node* value = node->InputAt(0); Node* context = node->InputAt(1); Node* frame_state = node->InputAt(2); Node* effect = node->InputAt(3); Node* control = node->InputAt(4); Node* check0 = graph()->NewNode(simplified()->ObjectIsSmi(), value); Node* branch0 = graph()->NewNode(common()->Branch(BranchHint::kTrue), check0, control); Node* if_true0 = graph()->NewNode(common()->IfTrue(), branch0); Node* etrue0 = effect; Node* vtrue0 = graph()->NewNode(simplified()->ChangeTaggedSignedToInt32(), value); Node* if_false0 = graph()->NewNode(common()->IfFalse(), branch0); Node* efalse0 = effect; Node* vfalse0; { Operator const* op = node->opcode() == IrOpcode::kJSToNumber ? (node->opcode() == IrOpcode::kJSToNumberConvertBigInt ? ToNumberConvertBigIntOperator() : ToNumberOperator()) : ToNumericOperator(); Node* code = node->opcode() == IrOpcode::kJSToNumber ? ToNumberCode() : (node->opcode() == IrOpcode::kJSToNumberConvertBigInt ? ToNumberConvertBigIntCode() : ToNumericCode()); vfalse0 = efalse0 = if_false0 = graph()->NewNode( op, code, value, context, frame_state, efalse0, if_false0); // Update potential {IfException} uses of {node} to point to the above // stub call node instead. Node* on_exception = nullptr; if (NodeProperties::IsExceptionalCall(node, &on_exception)) { NodeProperties::ReplaceControlInput(on_exception, vfalse0); NodeProperties::ReplaceEffectInput(on_exception, efalse0); if_false0 = graph()->NewNode(common()->IfSuccess(), vfalse0); } Node* check1 = graph()->NewNode(simplified()->ObjectIsSmi(), vfalse0); Node* branch1 = graph()->NewNode(common()->Branch(), check1, if_false0); Node* if_true1 = graph()->NewNode(common()->IfTrue(), branch1); Node* etrue1 = efalse0; Node* vtrue1 = graph()->NewNode(simplified()->ChangeTaggedSignedToInt32(), vfalse0); Node* if_false1 = graph()->NewNode(common()->IfFalse(), branch1); Node* efalse1 = efalse0; Node* vfalse1; { vfalse1 = efalse1 = graph()->NewNode( simplified()->LoadField(AccessBuilder::ForHeapNumberValue()), efalse0, efalse1, if_false1); vfalse1 = graph()->NewNode(machine()->TruncateFloat64ToWord32(), vfalse1); } if_false0 = graph()->NewNode(common()->Merge(2), if_true1, if_false1); efalse0 = graph()->NewNode(common()->EffectPhi(2), etrue1, efalse1, if_false0); vfalse0 = graph()->NewNode(common()->Phi(MachineRepresentation::kWord32, 2), vtrue1, vfalse1, if_false0); } control = graph()->NewNode(common()->Merge(2), if_true0, if_false0); effect = graph()->NewNode(common()->EffectPhi(2), etrue0, efalse0, control); value = graph()->NewNode(common()->Phi(MachineRepresentation::kWord32, 2), vtrue0, vfalse0, control); // Replace effect and control uses appropriately. for (Edge edge : node->use_edges()) { if (NodeProperties::IsControlEdge(edge)) { if (edge.from()->opcode() == IrOpcode::kIfSuccess) { edge.from()->ReplaceUses(control); edge.from()->Kill(); } else { DCHECK_NE(IrOpcode::kIfException, edge.from()->opcode()); edge.UpdateTo(control); } } else if (NodeProperties::IsEffectEdge(edge)) { edge.UpdateTo(effect); } } selector->DeferReplacement(node, value); } Node* SimplifiedLowering::Float64Round(Node* const node) { Node* const one = jsgraph()->Float64Constant(1.0); Node* const one_half = jsgraph()->Float64Constant(0.5); Node* const input = node->InputAt(0); // Round up towards Infinity, and adjust if the difference exceeds 0.5. Node* result = graph()->NewNode(machine()->Float64RoundUp().placeholder(), node->InputAt(0)); return graph()->NewNode( common()->Select(MachineRepresentation::kFloat64), graph()->NewNode( machine()->Float64LessThanOrEqual(), graph()->NewNode(machine()->Float64Sub(), result, one_half), input), result, graph()->NewNode(machine()->Float64Sub(), result, one)); } Node* SimplifiedLowering::Float64Sign(Node* const node) { Node* const minus_one = jsgraph()->Float64Constant(-1.0); Node* const zero = jsgraph()->Float64Constant(0.0); Node* const one = jsgraph()->Float64Constant(1.0); Node* const input = node->InputAt(0); return graph()->NewNode( common()->Select(MachineRepresentation::kFloat64), graph()->NewNode(machine()->Float64LessThan(), input, zero), minus_one, graph()->NewNode( common()->Select(MachineRepresentation::kFloat64), graph()->NewNode(machine()->Float64LessThan(), zero, input), one, input)); } Node* SimplifiedLowering::Int32Abs(Node* const node) { Node* const input = node->InputAt(0); // Generate case for absolute integer value. // // let sign = input >> 31 in // (input ^ sign) - sign Node* sign = graph()->NewNode(machine()->Word32Sar(), input, jsgraph()->Int32Constant(31)); return graph()->NewNode(machine()->Int32Sub(), graph()->NewNode(machine()->Word32Xor(), input, sign), sign); } Node* SimplifiedLowering::Int32Div(Node* const node) { Int32BinopMatcher m(node); Node* const zero = jsgraph()->Int32Constant(0); Node* const minus_one = jsgraph()->Int32Constant(-1); Node* const lhs = m.left().node(); Node* const rhs = m.right().node(); if (m.right().Is(-1)) { return graph()->NewNode(machine()->Int32Sub(), zero, lhs); } else if (m.right().Is(0)) { return rhs; } else if (machine()->Int32DivIsSafe() || m.right().HasValue()) { return graph()->NewNode(machine()->Int32Div(), lhs, rhs, graph()->start()); } // General case for signed integer division. // // if 0 < rhs then // lhs / rhs // else // if rhs < -1 then // lhs / rhs // else if rhs == 0 then // 0 // else // 0 - lhs // // Note: We do not use the Diamond helper class here, because it really hurts // readability with nested diamonds. const Operator* const merge_op = common()->Merge(2); const Operator* const phi_op = common()->Phi(MachineRepresentation::kWord32, 2); Node* check0 = graph()->NewNode(machine()->Int32LessThan(), zero, rhs); Node* branch0 = graph()->NewNode(common()->Branch(BranchHint::kTrue), check0, graph()->start()); Node* if_true0 = graph()->NewNode(common()->IfTrue(), branch0); Node* true0 = graph()->NewNode(machine()->Int32Div(), lhs, rhs, if_true0); Node* if_false0 = graph()->NewNode(common()->IfFalse(), branch0); Node* false0; { Node* check1 = graph()->NewNode(machine()->Int32LessThan(), rhs, minus_one); Node* branch1 = graph()->NewNode(common()->Branch(), check1, if_false0); Node* if_true1 = graph()->NewNode(common()->IfTrue(), branch1); Node* true1 = graph()->NewNode(machine()->Int32Div(), lhs, rhs, if_true1); Node* if_false1 = graph()->NewNode(common()->IfFalse(), branch1); Node* false1; { Node* check2 = graph()->NewNode(machine()->Word32Equal(), rhs, zero); Node* branch2 = graph()->NewNode(common()->Branch(), check2, if_false1); Node* if_true2 = graph()->NewNode(common()->IfTrue(), branch2); Node* true2 = zero; Node* if_false2 = graph()->NewNode(common()->IfFalse(), branch2); Node* false2 = graph()->NewNode(machine()->Int32Sub(), zero, lhs); if_false1 = graph()->NewNode(merge_op, if_true2, if_false2); false1 = graph()->NewNode(phi_op, true2, false2, if_false1); } if_false0 = graph()->NewNode(merge_op, if_true1, if_false1); false0 = graph()->NewNode(phi_op, true1, false1, if_false0); } Node* merge0 = graph()->NewNode(merge_op, if_true0, if_false0); return graph()->NewNode(phi_op, true0, false0, merge0); } Node* SimplifiedLowering::Int32Mod(Node* const node) { Int32BinopMatcher m(node); Node* const zero = jsgraph()->Int32Constant(0); Node* const minus_one = jsgraph()->Int32Constant(-1); Node* const lhs = m.left().node(); Node* const rhs = m.right().node(); if (m.right().Is(-1) || m.right().Is(0)) { return zero; } else if (m.right().HasValue()) { return graph()->NewNode(machine()->Int32Mod(), lhs, rhs, graph()->start()); } // General case for signed integer modulus, with optimization for (unknown) // power of 2 right hand side. // // if 0 < rhs then // msk = rhs - 1 // if rhs & msk != 0 then // lhs % rhs // else // if lhs < 0 then // -(-lhs & msk) // else // lhs & msk // else // if rhs < -1 then // lhs % rhs // else // zero // // Note: We do not use the Diamond helper class here, because it really hurts // readability with nested diamonds. const Operator* const merge_op = common()->Merge(2); const Operator* const phi_op = common()->Phi(MachineRepresentation::kWord32, 2); Node* check0 = graph()->NewNode(machine()->Int32LessThan(), zero, rhs); Node* branch0 = graph()->NewNode(common()->Branch(BranchHint::kTrue), check0, graph()->start()); Node* if_true0 = graph()->NewNode(common()->IfTrue(), branch0); Node* true0; { Node* msk = graph()->NewNode(machine()->Int32Add(), rhs, minus_one); Node* check1 = graph()->NewNode(machine()->Word32And(), rhs, msk); Node* branch1 = graph()->NewNode(common()->Branch(), check1, if_true0); Node* if_true1 = graph()->NewNode(common()->IfTrue(), branch1); Node* true1 = graph()->NewNode(machine()->Int32Mod(), lhs, rhs, if_true1); Node* if_false1 = graph()->NewNode(common()->IfFalse(), branch1); Node* false1; { Node* check2 = graph()->NewNode(machine()->Int32LessThan(), lhs, zero); Node* branch2 = graph()->NewNode(common()->Branch(BranchHint::kFalse), check2, if_false1); Node* if_true2 = graph()->NewNode(common()->IfTrue(), branch2); Node* true2 = graph()->NewNode( machine()->Int32Sub(), zero, graph()->NewNode(machine()->Word32And(), graph()->NewNode(machine()->Int32Sub(), zero, lhs), msk)); Node* if_false2 = graph()->NewNode(common()->IfFalse(), branch2); Node* false2 = graph()->NewNode(machine()->Word32And(), lhs, msk); if_false1 = graph()->NewNode(merge_op, if_true2, if_false2); false1 = graph()->NewNode(phi_op, true2, false2, if_false1); } if_true0 = graph()->NewNode(merge_op, if_true1, if_false1); true0 = graph()->NewNode(phi_op, true1, false1, if_true0); } Node* if_false0 = graph()->NewNode(common()->IfFalse(), branch0); Node* false0; { Node* check1 = graph()->NewNode(machine()->Int32LessThan(), rhs, minus_one); Node* branch1 = graph()->NewNode(common()->Branch(BranchHint::kTrue), check1, if_false0); Node* if_true1 = graph()->NewNode(common()->IfTrue(), branch1); Node* true1 = graph()->NewNode(machine()->Int32Mod(), lhs, rhs, if_true1); Node* if_false1 = graph()->NewNode(common()->IfFalse(), branch1); Node* false1 = zero; if_false0 = graph()->NewNode(merge_op, if_true1, if_false1); false0 = graph()->NewNode(phi_op, true1, false1, if_false0); } Node* merge0 = graph()->NewNode(merge_op, if_true0, if_false0); return graph()->NewNode(phi_op, true0, false0, merge0); } Node* SimplifiedLowering::Int32Sign(Node* const node) { Node* const minus_one = jsgraph()->Int32Constant(-1); Node* const zero = jsgraph()->Int32Constant(0); Node* const one = jsgraph()->Int32Constant(1); Node* const input = node->InputAt(0); return graph()->NewNode( common()->Select(MachineRepresentation::kWord32), graph()->NewNode(machine()->Int32LessThan(), input, zero), minus_one, graph()->NewNode( common()->Select(MachineRepresentation::kWord32), graph()->NewNode(machine()->Int32LessThan(), zero, input), one, zero)); } Node* SimplifiedLowering::Uint32Div(Node* const node) { Uint32BinopMatcher m(node); Node* const zero = jsgraph()->Uint32Constant(0); Node* const lhs = m.left().node(); Node* const rhs = m.right().node(); if (m.right().Is(0)) { return zero; } else if (machine()->Uint32DivIsSafe() || m.right().HasValue()) { return graph()->NewNode(machine()->Uint32Div(), lhs, rhs, graph()->start()); } Node* check = graph()->NewNode(machine()->Word32Equal(), rhs, zero); Diamond d(graph(), common(), check, BranchHint::kFalse); Node* div = graph()->NewNode(machine()->Uint32Div(), lhs, rhs, d.if_false); return d.Phi(MachineRepresentation::kWord32, zero, div); } Node* SimplifiedLowering::Uint32Mod(Node* const node) { Uint32BinopMatcher m(node); Node* const minus_one = jsgraph()->Int32Constant(-1); Node* const zero = jsgraph()->Uint32Constant(0); Node* const lhs = m.left().node(); Node* const rhs = m.right().node(); if (m.right().Is(0)) { return zero; } else if (m.right().HasValue()) { return graph()->NewNode(machine()->Uint32Mod(), lhs, rhs, graph()->start()); } // General case for unsigned integer modulus, with optimization for (unknown) // power of 2 right hand side. // // if rhs == 0 then // zero // else // msk = rhs - 1 // if rhs & msk != 0 then // lhs % rhs // else // lhs & msk // // Note: We do not use the Diamond helper class here, because it really hurts // readability with nested diamonds. const Operator* const merge_op = common()->Merge(2); const Operator* const phi_op = common()->Phi(MachineRepresentation::kWord32, 2); Node* check0 = graph()->NewNode(machine()->Word32Equal(), rhs, zero); Node* branch0 = graph()->NewNode(common()->Branch(BranchHint::kFalse), check0, graph()->start()); Node* if_true0 = graph()->NewNode(common()->IfTrue(), branch0); Node* true0 = zero; Node* if_false0 = graph()->NewNode(common()->IfFalse(), branch0); Node* false0; { Node* msk = graph()->NewNode(machine()->Int32Add(), rhs, minus_one); Node* check1 = graph()->NewNode(machine()->Word32And(), rhs, msk); Node* branch1 = graph()->NewNode(common()->Branch(), check1, if_false0); Node* if_true1 = graph()->NewNode(common()->IfTrue(), branch1); Node* true1 = graph()->NewNode(machine()->Uint32Mod(), lhs, rhs, if_true1); Node* if_false1 = graph()->NewNode(common()->IfFalse(), branch1); Node* false1 = graph()->NewNode(machine()->Word32And(), lhs, msk); if_false0 = graph()->NewNode(merge_op, if_true1, if_false1); false0 = graph()->NewNode(phi_op, true1, false1, if_false0); } Node* merge0 = graph()->NewNode(merge_op, if_true0, if_false0); return graph()->NewNode(phi_op, true0, false0, merge0); } void SimplifiedLowering::DoMax(Node* node, Operator const* op, MachineRepresentation rep) { Node* const lhs = node->InputAt(0); Node* const rhs = node->InputAt(1); node->ReplaceInput(0, graph()->NewNode(op, lhs, rhs)); DCHECK_EQ(rhs, node->InputAt(1)); node->AppendInput(graph()->zone(), lhs); NodeProperties::ChangeOp(node, common()->Select(rep)); } void SimplifiedLowering::DoMin(Node* node, Operator const* op, MachineRepresentation rep) { Node* const lhs = node->InputAt(0); Node* const rhs = node->InputAt(1); node->InsertInput(graph()->zone(), 0, graph()->NewNode(op, lhs, rhs)); DCHECK_EQ(lhs, node->InputAt(1)); DCHECK_EQ(rhs, node->InputAt(2)); NodeProperties::ChangeOp(node, common()->Select(rep)); } void SimplifiedLowering::DoIntegral32ToBit(Node* node) { Node* const input = node->InputAt(0); Node* const zero = jsgraph()->Int32Constant(0); Operator const* const op = machine()->Word32Equal(); node->ReplaceInput(0, graph()->NewNode(op, input, zero)); node->AppendInput(graph()->zone(), zero); NodeProperties::ChangeOp(node, op); } void SimplifiedLowering::DoOrderedNumberToBit(Node* node) { Node* const input = node->InputAt(0); node->ReplaceInput(0, graph()->NewNode(machine()->Float64Equal(), input, jsgraph()->Float64Constant(0.0))); node->AppendInput(graph()->zone(), jsgraph()->Int32Constant(0)); NodeProperties::ChangeOp(node, machine()->Word32Equal()); } void SimplifiedLowering::DoNumberToBit(Node* node) { Node* const input = node->InputAt(0); node->ReplaceInput(0, jsgraph()->Float64Constant(0.0)); node->AppendInput(graph()->zone(), graph()->NewNode(machine()->Float64Abs(), input)); NodeProperties::ChangeOp(node, machine()->Float64LessThan()); } void SimplifiedLowering::DoIntegerToUint8Clamped(Node* node) { Node* const input = node->InputAt(0); Node* const min = jsgraph()->Float64Constant(0.0); Node* const max = jsgraph()->Float64Constant(255.0); node->ReplaceInput( 0, graph()->NewNode(machine()->Float64LessThan(), min, input)); node->AppendInput( graph()->zone(), graph()->NewNode( common()->Select(MachineRepresentation::kFloat64), graph()->NewNode(machine()->Float64LessThan(), input, max), input, max)); node->AppendInput(graph()->zone(), min); NodeProperties::ChangeOp(node, common()->Select(MachineRepresentation::kFloat64)); } void SimplifiedLowering::DoNumberToUint8Clamped(Node* node) { Node* const input = node->InputAt(0); Node* const min = jsgraph()->Float64Constant(0.0); Node* const max = jsgraph()->Float64Constant(255.0); node->ReplaceInput( 0, graph()->NewNode( common()->Select(MachineRepresentation::kFloat64), graph()->NewNode(machine()->Float64LessThan(), min, input), graph()->NewNode( common()->Select(MachineRepresentation::kFloat64), graph()->NewNode(machine()->Float64LessThan(), input, max), input, max), min)); NodeProperties::ChangeOp(node, machine()->Float64RoundTiesEven().placeholder()); } void SimplifiedLowering::DoSigned32ToUint8Clamped(Node* node) { Node* const input = node->InputAt(0); Node* const min = jsgraph()->Int32Constant(0); Node* const max = jsgraph()->Int32Constant(255); node->ReplaceInput( 0, graph()->NewNode(machine()->Int32LessThanOrEqual(), input, max)); node->AppendInput( graph()->zone(), graph()->NewNode(common()->Select(MachineRepresentation::kWord32), graph()->NewNode(machine()->Int32LessThan(), input, min), min, input)); node->AppendInput(graph()->zone(), max); NodeProperties::ChangeOp(node, common()->Select(MachineRepresentation::kWord32)); } void SimplifiedLowering::DoUnsigned32ToUint8Clamped(Node* node) { Node* const input = node->InputAt(0); Node* const max = jsgraph()->Uint32Constant(255u); node->ReplaceInput( 0, graph()->NewNode(machine()->Uint32LessThanOrEqual(), input, max)); node->AppendInput(graph()->zone(), input); node->AppendInput(graph()->zone(), max); NodeProperties::ChangeOp(node, common()->Select(MachineRepresentation::kWord32)); } Node* SimplifiedLowering::ToNumberCode() { if (!to_number_code_.is_set()) { Callable callable = Builtins::CallableFor(isolate(), Builtins::kToNumber); to_number_code_.set(jsgraph()->HeapConstant(callable.code())); } return to_number_code_.get(); } Node* SimplifiedLowering::ToNumberConvertBigIntCode() { if (!to_number_convert_big_int_code_.is_set()) { Callable callable = Builtins::CallableFor(isolate(), Builtins::kToNumberConvertBigInt); to_number_convert_big_int_code_.set( jsgraph()->HeapConstant(callable.code())); } return to_number_convert_big_int_code_.get(); } Node* SimplifiedLowering::ToNumericCode() { if (!to_numeric_code_.is_set()) { Callable callable = Builtins::CallableFor(isolate(), Builtins::kToNumeric); to_numeric_code_.set(jsgraph()->HeapConstant(callable.code())); } return to_numeric_code_.get(); } Operator const* SimplifiedLowering::ToNumberOperator() { if (!to_number_operator_.is_set()) { Callable callable = Builtins::CallableFor(isolate(), Builtins::kToNumber); CallDescriptor::Flags flags = CallDescriptor::kNeedsFrameState; auto call_descriptor = Linkage::GetStubCallDescriptor( graph()->zone(), callable.descriptor(), callable.descriptor().GetStackParameterCount(), flags, Operator::kNoProperties); to_number_operator_.set(common()->Call(call_descriptor)); } return to_number_operator_.get(); } Operator const* SimplifiedLowering::ToNumberConvertBigIntOperator() { if (!to_number_convert_big_int_operator_.is_set()) { Callable callable = Builtins::CallableFor(isolate(), Builtins::kToNumberConvertBigInt); CallDescriptor::Flags flags = CallDescriptor::kNeedsFrameState; auto call_descriptor = Linkage::GetStubCallDescriptor( graph()->zone(), callable.descriptor(), callable.descriptor().GetStackParameterCount(), flags, Operator::kNoProperties); to_number_convert_big_int_operator_.set(common()->Call(call_descriptor)); } return to_number_convert_big_int_operator_.get(); } Operator const* SimplifiedLowering::ToNumericOperator() { if (!to_numeric_operator_.is_set()) { Callable callable = Builtins::CallableFor(isolate(), Builtins::kToNumeric); CallDescriptor::Flags flags = CallDescriptor::kNeedsFrameState; auto call_descriptor = Linkage::GetStubCallDescriptor( graph()->zone(), callable.descriptor(), callable.descriptor().GetStackParameterCount(), flags, Operator::kNoProperties); to_numeric_operator_.set(common()->Call(call_descriptor)); } return to_numeric_operator_.get(); } #undef TRACE } // namespace compiler } // namespace internal } // namespace v8