Add support for forceful termination of JavaScript execution.

src/heap.cc

 // 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 1394 matching lines @@
 
   obj = CreateOddball(oddball_map(), "hole", Smi::FromInt(-1));
   if (obj->IsFailure()) return false;
   set_the_hole_value(obj);
 
   obj = CreateOddball(
       oddball_map(), "no_interceptor_result_sentinel", Smi::FromInt(-2));
   if (obj->IsFailure()) return false;
   set_no_interceptor_result_sentinel(obj);
 
+  obj = CreateOddball(oddball_map(), "termination_exception", Smi::FromInt(-3));
+  if (obj->IsFailure()) return false;
+  set_termination_exception(obj);
 
   // Allocate the empty string.
   obj = AllocateRawAsciiString(0, TENURED);
   if (obj->IsFailure()) return false;
   set_empty_string(String::cast(obj));
 
   for (unsigned i = 0; i < ARRAY_SIZE(constant_symbol_table); i++) {
     obj = LookupAsciiSymbol(constant_symbol_table[i].contents);
     if (obj->IsFailure()) return false;
     roots_[constant_symbol_table[i].index] = String::cast(obj);
@@ skipping 2487 matching lines @@
 #ifdef DEBUG
 bool Heap::GarbageCollectionGreedyCheck() {
   ASSERT(FLAG_gc_greedy);
   if (Bootstrapper::IsActive()) return true;
   if (disallow_allocation_failure()) return true;
   return CollectGarbage(0, NEW_SPACE);
 }
 #endif
 
 } }  // namespace v8::internal