| // Copyright 2013 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. |
| |
| #ifndef V8_COMPILER_NODE_PROPERTIES_H_ |
| #define V8_COMPILER_NODE_PROPERTIES_H_ |
| |
| #include "src/compiler/node.h" |
| #include "src/compiler/types.h" |
| #include "src/globals.h" |
| #include "src/objects/map.h" |
| #include "src/zone/zone-handle-set.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace compiler { |
| |
| class Graph; |
| class Operator; |
| class CommonOperatorBuilder; |
| |
| // A facade that simplifies access to the different kinds of inputs to a node. |
| class V8_EXPORT_PRIVATE NodeProperties final { |
| public: |
| // --------------------------------------------------------------------------- |
| // Input layout. |
| // Inputs are always arranged in order as follows: |
| // 0 [ values, context, frame state, effects, control ] node->InputCount() |
| |
| static int FirstValueIndex(Node* node) { return 0; } |
| static int FirstContextIndex(Node* node) { return PastValueIndex(node); } |
| static int FirstFrameStateIndex(Node* node) { return PastContextIndex(node); } |
| static int FirstEffectIndex(Node* node) { return PastFrameStateIndex(node); } |
| static int FirstControlIndex(Node* node) { return PastEffectIndex(node); } |
| static int PastValueIndex(Node* node); |
| static int PastContextIndex(Node* node); |
| static int PastFrameStateIndex(Node* node); |
| static int PastEffectIndex(Node* node); |
| static int PastControlIndex(Node* node); |
| |
| |
| // --------------------------------------------------------------------------- |
| // Input accessors. |
| |
| static Node* GetValueInput(Node* node, int index); |
| static Node* GetContextInput(Node* node); |
| static Node* GetFrameStateInput(Node* node); |
| static Node* GetEffectInput(Node* node, int index = 0); |
| static Node* GetControlInput(Node* node, int index = 0); |
| |
| |
| // --------------------------------------------------------------------------- |
| // Edge kinds. |
| |
| static bool IsValueEdge(Edge edge); |
| static bool IsContextEdge(Edge edge); |
| static bool IsFrameStateEdge(Edge edge); |
| static bool IsEffectEdge(Edge edge); |
| static bool IsControlEdge(Edge edge); |
| |
| |
| // --------------------------------------------------------------------------- |
| // Miscellaneous predicates. |
| |
| static bool IsCommon(Node* node) { |
| return IrOpcode::IsCommonOpcode(node->opcode()); |
| } |
| static bool IsControl(Node* node) { |
| return IrOpcode::IsControlOpcode(node->opcode()); |
| } |
| static bool IsConstant(Node* node) { |
| return IrOpcode::IsConstantOpcode(node->opcode()); |
| } |
| static bool IsPhi(Node* node) { |
| return IrOpcode::IsPhiOpcode(node->opcode()); |
| } |
| |
| // Determines whether exceptions thrown by the given node are handled locally |
| // within the graph (i.e. an IfException projection is present). Optionally |
| // the present IfException projection is returned via {out_exception}. |
| static bool IsExceptionalCall(Node* node, Node** out_exception = nullptr); |
| |
| // Returns the node producing the successful control output of {node}. This is |
| // the IfSuccess projection of {node} if present and {node} itself otherwise. |
| static Node* FindSuccessfulControlProjection(Node* node); |
| |
| // --------------------------------------------------------------------------- |
| // Miscellaneous mutators. |
| |
| static void ReplaceValueInput(Node* node, Node* value, int index); |
| static void ReplaceContextInput(Node* node, Node* context); |
| static void ReplaceControlInput(Node* node, Node* control, int index = 0); |
| static void ReplaceEffectInput(Node* node, Node* effect, int index = 0); |
| static void ReplaceFrameStateInput(Node* node, Node* frame_state); |
| static void RemoveNonValueInputs(Node* node); |
| static void RemoveValueInputs(Node* node); |
| |
| // Replaces all value inputs of {node} with the single input {value}. |
| static void ReplaceValueInputs(Node* node, Node* value); |
| |
| // Merge the control node {node} into the end of the graph, introducing a |
| // merge node or expanding an existing merge node if necessary. |
| static void MergeControlToEnd(Graph* graph, CommonOperatorBuilder* common, |
| Node* node); |
| |
| // Replace all uses of {node} with the given replacement nodes. All occurring |
| // use kinds need to be replaced, {nullptr} is only valid if a use kind is |
| // guaranteed not to exist. |
| static void ReplaceUses(Node* node, Node* value, Node* effect = nullptr, |
| Node* success = nullptr, Node* exception = nullptr); |
| |
| // Safe wrapper to mutate the operator of a node. Checks that the node is |
| // currently in a state that satisfies constraints of the new operator. |
| static void ChangeOp(Node* node, const Operator* new_op); |
| |
| // --------------------------------------------------------------------------- |
| // Miscellaneous utilities. |
| |
| // Find the last frame state that is effect-wise before the given node. This |
| // assumes a linear effect-chain up to a {CheckPoint} node in the graph. |
| static Node* FindFrameStateBefore(Node* node); |
| |
| // Collect the output-value projection for the given output index. |
| static Node* FindProjection(Node* node, size_t projection_index); |
| |
| // Collect the value projections from a node. |
| static void CollectValueProjections(Node* node, Node** proj, size_t count); |
| |
| // Collect the branch-related projections from a node, such as IfTrue, |
| // IfFalse, IfSuccess, IfException, IfValue and IfDefault. |
| // - Branch: [ IfTrue, IfFalse ] |
| // - Call : [ IfSuccess, IfException ] |
| // - Switch: [ IfValue, ..., IfDefault ] |
| static void CollectControlProjections(Node* node, Node** proj, size_t count); |
| |
| // Checks if two nodes are the same, looking past {CheckHeapObject}. |
| static bool IsSame(Node* a, Node* b); |
| |
| // Check if two nodes have equal operators and reference-equal inputs. Used |
| // for value numbering/hash-consing. |
| static bool Equals(Node* a, Node* b); |
| // A corresponding hash function. |
| static size_t HashCode(Node* node); |
| |
| // Walks up the {effect} chain to find a witness that provides map |
| // information about the {receiver}. Can look through potentially |
| // side effecting nodes. |
| enum InferReceiverMapsResult { |
| kNoReceiverMaps, // No receiver maps inferred. |
| kReliableReceiverMaps, // Receiver maps can be trusted. |
| kUnreliableReceiverMaps // Receiver maps might have changed (side-effect), |
| // but instance type is reliable. |
| }; |
| static InferReceiverMapsResult InferReceiverMaps( |
| Node* receiver, Node* effect, ZoneHandleSet<Map>* maps_return); |
| |
| static MaybeHandle<Map> GetMapWitness(Node* node); |
| |
| // Walks up the {effect} chain to check that there's no observable side-effect |
| // between the {effect} and it's {dominator}. Aborts the walk if there's join |
| // in the effect chain. |
| static bool NoObservableSideEffectBetween(Node* effect, Node* dominator); |
| |
| // Returns true if the {receiver} can be a primitive value (i.e. is not |
| // definitely a JavaScript object); might walk up the {effect} chain to |
| // find map checks on {receiver}. |
| static bool CanBePrimitive(Node* receiver, Node* effect); |
| |
| // Returns true if the {receiver} can be null or undefined. Might walk |
| // up the {effect} chain to find map checks for {receiver}. |
| static bool CanBeNullOrUndefined(Node* receiver, Node* effect); |
| |
| // --------------------------------------------------------------------------- |
| // Context. |
| |
| // Walk up the context chain from the given {node} until we reduce the {depth} |
| // to 0 or hit a node that does not extend the context chain ({depth} will be |
| // updated accordingly). |
| static Node* GetOuterContext(Node* node, size_t* depth); |
| |
| // --------------------------------------------------------------------------- |
| // Type. |
| |
| static bool IsTyped(Node* node) { return node->type() != nullptr; } |
| static Type* GetType(Node* node) { |
| DCHECK(IsTyped(node)); |
| return node->type(); |
| } |
| static Type* GetTypeOrAny(Node* node); |
| static void SetType(Node* node, Type* type) { |
| DCHECK_NOT_NULL(type); |
| node->set_type(type); |
| } |
| static void RemoveType(Node* node) { node->set_type(nullptr); } |
| static bool AllValueInputsAreTyped(Node* node); |
| |
| private: |
| static inline bool IsInputRange(Edge edge, int first, int count); |
| }; |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_COMPILER_NODE_PROPERTIES_H_ |