Skeleton of a linear scan register allocator.

runtime/vm/flow_graph_compiler_ia32.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_FLOW_GRAPH_COMPILER_IA32_H_
 #define VM_FLOW_GRAPH_COMPILER_IA32_H_
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #error Include flow_graph_compiler.h instead of flow_graph_compiler_ia32.h.
 #endif
@@ skipping 287 matching lines @@
  public:
   DeoptimizationStub(intptr_t deopt_id,
                      intptr_t deopt_token_pos,
                      intptr_t try_index,
                      DeoptReasonId reason)
       : deopt_id_(deopt_id),
         deopt_token_pos_(deopt_token_pos),
         try_index_(try_index),
         reason_(reason),
         registers_(2),
+        deoptimization_env_(NULL),
         entry_label_() {}
 
   void Push(Register reg) { registers_.Add(reg); }
   Label* entry_label() { return &entry_label_; }
 
   // Implementation is in architecture specific file.
   void GenerateCode(FlowGraphCompiler* compiler);
 
  private:
   const intptr_t deopt_id_;
   const intptr_t deopt_token_pos_;
   const intptr_t try_index_;
   const DeoptReasonId reason_;
   GrowableArray<Register> registers_;
+  const Environment* deoptimization_env_;
   Label entry_label_;
 
   DISALLOW_COPY_AND_ASSIGN(DeoptimizationStub);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_IA32_H_