Early draft of strict mode

src/heap.h

 // Copyright 2010 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 185 matching lines @@
   V(illegal_break_symbol, "illegal_break")                               \
   V(illegal_continue_symbol, "illegal_continue")                         \
   V(unknown_label_symbol, "unknown_label")                               \
   V(redeclaration_symbol, "redeclaration")                               \
   V(failure_symbol, "<failure>")                                         \
   V(space_symbol, " ")                                                   \
   V(exec_symbol, "exec")                                                 \
   V(zero_symbol, "0")                                                    \
   V(global_eval_symbol, "GlobalEval")                                    \
   V(identity_hash_symbol, "v8::IdentityHash")                            \
-  V(closure_symbol, "(closure)")
+  V(closure_symbol, "(closure)")                                         \
+  V(use_strict, "use strict")
 
 
 // Forward declarations.
 class GCTracer;
 class HeapStats;
 class WeakObjectRetainer;
 
 
 typedef String* (*ExternalStringTableUpdaterCallback)(Object** pointer);
 
@@ skipping 1906 matching lines @@
   // Return whether this object should be retained. If NULL is returned the
   // object has no references. Otherwise the address of the retained object
   // should be returned as in some GC situations the object has been moved.
   virtual Object* RetainAs(Object* object) = 0;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_