* Make stack/preemption guard faster on ARM by putting stack...

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 3238 matching lines @@
     if (!CreateInitialObjects()) return false;
   }
 
   LOG(IntEvent("heap-capacity", Capacity()));
   LOG(IntEvent("heap-available", Available()));
 
   return true;
 }
 
 
+void Heap::SetStackLimit(intptr_t limit) {
+  // Set up the special root array entry is the stack guard.

[Mads Ager (chromium), 2009/08/26 10:09:28]

is -> containing?

+  // This is actually an address, but the tag makes the GC ignore it.
+  limit &= ~kSmiTagMask;
+  limit |= kSmiTag;

[Mads Ager (chromium), 2009/08/26 10:09:28]

Do you need this?  You should be able to remove the explicit bit-fiddling here.

+  set_stack_limit(Smi::FromInt(limit >> kSmiTagSize));
+}
+
+
 void Heap::TearDown() {
   GlobalHandles::TearDown();
 
   new_space_.TearDown();
 
   if (old_pointer_space_ != NULL) {
     old_pointer_space_->TearDown();
     delete old_pointer_space_;
     old_pointer_space_ = NULL;
   }
@@ skipping 690 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