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// 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"
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 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).
static bool IsExceptionalCall(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 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);
// ---------------------------------------------------------------------------
// Context.
// Try to retrieve the specialization context from the given {node},
// optionally utilizing the knowledge about the (outermost) function
// {context}.
static MaybeHandle<Context> GetSpecializationContext(
Node* node, MaybeHandle<Context> context = MaybeHandle<Context>());
// Try to retrieve the specialization native context from the given
// {node}, optionally utilizing the knowledge about the (outermost)
// {native_context}.
static MaybeHandle<Context> GetSpecializationNativeContext(
Node* node, MaybeHandle<Context> native_context = MaybeHandle<Context>());
// Try to retrieve the specialization global object from the given
// {node}, optionally utilizing the knowledge about the (outermost)
// {native_context}.
static MaybeHandle<JSGlobalObject> GetSpecializationGlobalObject(
Node* node, MaybeHandle<Context> native_context = MaybeHandle<Context>());
// ---------------------------------------------------------------------------
// 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_
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