[turbofan] Cache for reusing value vector nodes in frame states.

src/compiler/ast-graph-builder.h

 // 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.
 
 #ifndef V8_COMPILER_AST_GRAPH_BUILDER_H_
 #define V8_COMPILER_AST_GRAPH_BUILDER_H_
 
 #include "src/ast.h"
 #include "src/compiler/js-graph.h"
+#include "src/compiler/state-values-utils.h"
 
 namespace v8 {
 namespace internal {
 
 class BitVector;
 
 namespace compiler {
 
 class ControlBuilder;
 class Graph;
@@ skipping 70 matching lines @@
   // Temporary storage for building node input lists.
   int input_buffer_size_;
   Node** input_buffer_;
 
   // Merge of all control nodes that exit the function body.
   Node* exit_control_;
 
   // Result of loop assignment analysis performed before graph creation.
   LoopAssignmentAnalysis* loop_assignment_analysis_;
 
+  // Cache for StateValues nodes for frame states.
+  StateValuesCache state_values_cache_;
+
   // Growth increment for the temporary buffer used to construct input lists to
   // new nodes.
   static const int kInputBufferSizeIncrement = 64;
 
   Zone* local_zone() const { return local_zone_; }
   Environment* environment() const { return environment_; }
   AstContext* ast_context() const { return ast_context_; }
   ControlScope* execution_control() const { return execution_control_; }
   ContextScope* execution_context() const { return execution_context_; }
   CommonOperatorBuilder* common() const { return jsgraph_->common(); }
@@ skipping 373 matching lines @@
   NodeVector contexts_;
   Node* control_dependency_;
   Node* effect_dependency_;
   Node* parameters_node_;
   Node* locals_node_;
   Node* stack_node_;
 
   explicit Environment(const Environment* copy);
   Environment* Copy() { return new (zone()) Environment(this); }
   void UpdateStateValues(Node** state_values, int offset, int count);
+  void UpdateStateValuesWithCache(Node** state_values, int offset, int count);
   Zone* zone() const { return builder_->local_zone(); }
   Graph* graph() const { return builder_->graph(); }
   AstGraphBuilder* builder() const { return builder_; }
   CommonOperatorBuilder* common() { return builder_->common(); }
   NodeVector* values() { return &values_; }
   NodeVector* contexts() { return &contexts_; }
 
   // Prepare environment to be used as loop header.
   void PrepareForLoop(BitVector* assigned, bool is_osr = false);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_AST_GRAPH_BUILDER_H_