Fast-codegen: Implementing try/finally on top of nesting context.

src/fast-codegen.h

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 248 matching lines @@
 
   // Complete a keyed property assignment.  The reciever, key, and
   // right-hand-side value are expected on top of the stack.
   void EmitKeyedPropertyAssignment(Assignment* expr);
 
   void SetFunctionPosition(FunctionLiteral* fun);
   void SetReturnPosition(FunctionLiteral* fun);
   void SetStatementPosition(Statement* stmt);
   void SetSourcePosition(int pos);
 
+  // Non-local control flow support.
+  void EnterFinallyBlock();
+  void ReturnFromFinallyBlock();
+  void ThrowException();
+
+  // Loop nesting counter.
   int loop_depth() { return loop_depth_; }
   void increment_loop_depth() { loop_depth_++; }
   void decrement_loop_depth() {
     ASSERT(loop_depth_ > 0);
     loop_depth_--;
   }
 
   MacroAssembler* masm() { return masm_; }
   static Register result_register();
 
@@ skipping 17 matching lines @@
 
   friend class NestedStatement;
 
   DISALLOW_COPY_AND_ASSIGN(FastCodeGenerator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FAST_CODEGEN_H_