Initial work on computing SSA.

runtime/vm/flow_graph_builder.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_BUILDER_H_
 #define VM_FLOW_GRAPH_BUILDER_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 34 matching lines @@
  private:
   void ComputeDominators(GrowableArray<BlockEntryInstr*>* preorder,
                          GrowableArray<intptr_t>* parent,
                          GrowableArray<BitVector*>* dominance_frontier);
 
   void CompressPath(intptr_t start_index,
                     intptr_t current_index,
                     GrowableArray<intptr_t>* parent,
                     GrowableArray<intptr_t>* label);
 
+  void InsertPhis(GrowableArray<BlockEntryInstr*>* preorder,
+                  GrowableArray<BitVector*>* assigned_vars,
+                  intptr_t var_count,
+                  GrowableArray<BitVector*>* dom_frontier);
+
   const ParsedFunction& parsed_function_;
   GrowableArray<BlockEntryInstr*> preorder_block_entries_;
   GrowableArray<BlockEntryInstr*> postorder_block_entries_;
   intptr_t context_level_;
   intptr_t last_used_try_index_;
   intptr_t try_index_;
   GraphEntryInstr* graph_entry_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(FlowGraphBuilder);
 };
@@ skipping 225 matching lines @@
   // Output parameters.
   TargetEntryInstr** true_successor_address_;
   TargetEntryInstr** false_successor_address_;
 
   intptr_t condition_token_index_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_BUILDER_H_