Introduce subclass wrappers for STL containers that make them a lot easier

src/compiler/structured-machine-assembler.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_STRUCTURED_MACHINE_ASSEMBLER_H_
 #define V8_COMPILER_STRUCTURED_MACHINE_ASSEMBLER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/common-operator.h"
@@ skipping 83 matching lines @@
   virtual Node* MakeNode(Operator* op, int input_count, Node** inputs);
 
   Schedule* schedule() {
     DCHECK(ScheduleValid());
     return schedule_;
   }
 
  private:
   bool ScheduleValid() { return schedule_ != NULL; }
 
-  typedef std::vector<Environment*, zone_allocator<Environment*> >
-      EnvironmentVector;
+  typedef ZoneVector<Environment*> EnvironmentVector;
 
   NodeVector* CurrentVars() { return &current_environment_->variables_; }
   Node*& VariableAt(Environment* environment, int offset);
   Node* GetVariable(int offset);
   void SetVariable(int offset, Node* value);
 
   void AddBranch(Environment* environment, Node* condition,
                  Environment* true_val, Environment* false_val);
   void AddGoto(Environment* from, Environment* to);
   BasicBlock* TrampolineFor(BasicBlock* block);
 
   void CopyCurrentAsDead();
   Environment* Copy(Environment* environment) {
     return Copy(environment, static_cast<int>(environment->variables_.size()));
   }
   Environment* Copy(Environment* environment, int truncate_at);
   void Merge(EnvironmentVector* environments, int truncate_at);
   Environment* CopyForLoopHeader(Environment* environment);
   void MergeBackEdgesToLoopHeader(Environment* header,
                                   EnvironmentVector* environments);
 
-  typedef std::vector<MachineType, zone_allocator<MachineType> >
-      RepresentationVector;
-
   Schedule* schedule_;
   MachineOperatorBuilder machine_;
   CommonOperatorBuilder common_;
   MachineCallDescriptorBuilder* call_descriptor_builder_;
   Node** parameters_;
   Environment* current_environment_;
   int number_of_variables_;
 
   friend class Variable;
   // For testing only.
@@ skipping 67 matching lines @@
     // next_ is the next link in the UnresolvedBranch chain, and will be
     // either the true or false branch jumped to from environment_.
     UnresolvedBranch* next_;
   };
 
   struct ExpressionState {
     int pending_then_size_;
     int pending_else_size_;
   };
 
-  typedef std::vector<ExpressionState, zone_allocator<ExpressionState> >
-      ExpressionStates;
-  typedef std::vector<UnresolvedBranch*, zone_allocator<UnresolvedBranch*> >
-      PendingMergeStack;
+  typedef ZoneVector<ExpressionState> ExpressionStates;
+  typedef ZoneVector<UnresolvedBranch*> PendingMergeStack;
   struct IfClause;
-  typedef std::vector<IfClause*, zone_allocator<IfClause*> > IfClauses;
+  typedef ZoneVector<IfClause*> IfClauses;
 
   struct PendingMergeStackRange {
     PendingMergeStack* merge_stack_;
     int start_;
     int size_;
   };
 
   enum CombineType { kCombineThen, kCombineElse };
   enum ResolutionType { kExpressionTerm, kExpressionDone };
 
@@ skipping 69 matching lines @@
   EnvironmentVector pending_header_merges_;
   EnvironmentVector pending_exit_merges_;
   DISALLOW_COPY_AND_ASSIGN(LoopBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_STRUCTURED_MACHINE_ASSEMBLER_H_