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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_DIAMOND_H_ #define V8_COMPILER_DIAMOND_H_ #include "src/compiler/common-operator.h" #include "src/compiler/graph.h" #include "src/compiler/node.h" namespace v8 { namespace internal { namespace compiler { // A helper to make it easier to build diamond-shaped control patterns. struct Diamond { Graph* graph; CommonOperatorBuilder* common; Node* branch; Node* if_true; Node* if_false; Node* merge; Diamond(Graph* g, CommonOperatorBuilder* b, Node* cond, BranchHint hint = BranchHint::kNone) { graph = g; common = b; branch = graph->NewNode(common->Branch(hint), cond, graph->start()); if_true = graph->NewNode(common->IfTrue(), branch); if_false = graph->NewNode(common->IfFalse(), branch); merge = graph->NewNode(common->Merge(2), if_true, if_false); } // Place {this} after {that} in control flow order. void Chain(Diamond const& that) { branch->ReplaceInput(1, that.merge); } // Place {this} after {that} in control flow order. void Chain(Node* that) { branch->ReplaceInput(1, that); } // Nest {this} into either the if_true or if_false branch of {that}. void Nest(Diamond const& that, bool if_true) { if (if_true) { branch->ReplaceInput(1, that.if_true); that.merge->ReplaceInput(0, merge); } else { branch->ReplaceInput(1, that.if_false); that.merge->ReplaceInput(1, merge); } } Node* Phi(MachineRepresentation rep, Node* tv, Node* fv) { return graph->NewNode(common->Phi(rep, 2), tv, fv, merge); } Node* EffectPhi(Node* tv, Node* fv) { return graph->NewNode(common->EffectPhi(2), tv, fv, merge); } }; } // namespace compiler } // namespace internal } // namespace v8 #endif // V8_COMPILER_DIAMOND_H_