Fix issue 493: Infinite loop when debug break is set when entering function.apply

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 3437 matching lines @@
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
   // This should be called only after initial objects have been created.
   ProducerHeapProfile::Setup();
 #endif
 
   return true;
 }
 
 
-void Heap::SetStackLimit(intptr_t limit) {
+void Heap::SetStackLimits() {
   // On 64 bit machines, pointers are generally out of range of Smis.  We write
   // something that looks like an out of range Smi to the GC.
 
-  // Set up the special root array entry containing the stack guard.
-  // This is actually an address, but the tag makes the GC ignore it.
+  // Set up the special root array entries containing the stack limits.
+  // These are actually addresses, but the tag makes the GC ignore it.
   roots_[kStackLimitRootIndex] =
-    reinterpret_cast<Object*>((limit & ~kSmiTagMask) | kSmiTag);
+      reinterpret_cast<Object*>(
+          (StackGuard::jslimit() & ~kSmiTagMask) | kSmiTag);
+  roots_[kRealStackLimitRootIndex] =
+      reinterpret_cast<Object*>(
+          (StackGuard::real_jslimit() & ~kSmiTagMask) | kSmiTag);
 }
 
 
 void Heap::TearDown() {
   GlobalHandles::TearDown();
 
   new_space_.TearDown();
 
   if (old_pointer_space_ != NULL) {
     old_pointer_space_->TearDown();
@@ skipping 554 matching lines @@
   for (int i = 0; i < kNumberOfCaches; i++) {
     if (caches_[i] != NULL) {
       delete caches_[i];
       caches_[i] = NULL;
     }
   }
 }
 
 
 } }  // namespace v8::internal