Fix a crash in graoh builder where a throw node is added in an expression tree by the parser: allow…

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 145 matching lines @@
 
   virtual void CompiletimeStringInterpolation(const Function& interpol_func,
                                               const Array& literals);
 
   TempVal* BuildObjectAllocation(ConstructorCallNode* node,
                                  int start_index);
   void BuildConstructorCall(ConstructorCallNode* node,
                             int start_index,
                             Value* alloc_value);
 
+  void BuildThrowNode(ThrowNode* node);
+
  private:
   // Specify a computation as the final result.  Adds a Do instruction to
   // the graph, but normally overridden in subclasses.
   virtual void ReturnComputation(Computation* computation) {
     AddInstruction(new DoInstr(computation));
   }
 
   // Shared global state.
   FlowGraphBuilder* owner_;
 
@@ skipping 18 matching lines @@
 
   // Visit functions overridden by this class.
   virtual void VisitLiteralNode(LiteralNode* node);
   virtual void VisitIncrOpLocalNode(IncrOpLocalNode* node);
   virtual void VisitIncrOpInstanceFieldNode(IncrOpInstanceFieldNode* node);
   virtual void VisitIncrOpIndexedNode(IncrOpIndexedNode* node);
   virtual void VisitConstructorCallNode(ConstructorCallNode* node);
   virtual void VisitBinaryOpNode(BinaryOpNode* node);
   virtual void VisitConditionalExprNode(ConditionalExprNode* node);
   virtual void VisitLoadLocalNode(LoadLocalNode* node);
+  virtual void VisitThrowNode(ThrowNode* node);
 
   Value* value() const { return value_; }
 
  protected:
   // Output parameters.
   Value* value_;
 
  private:
   // Helper to set the output state to return a Value.
   virtual void ReturnValue(Value* value) { value_ = value; }
@@ skipping 75 matching lines @@
   }
 
   // Output parameters.
   TargetEntryInstr** true_successor_address_;
   TargetEntryInstr** false_successor_address_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_BUILDER_H_