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

src/heap.h

 // Copyright 2006-2008 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 114 matching lines @@
   V(Proxy, prototype_accessors, PrototypeAccessors)                            \
   V(NumberDictionary, code_stubs, CodeStubs)                                   \
   V(NumberDictionary, non_monomorphic_cache, NonMonomorphicCache)              \
   V(Code, js_entry_code, JsEntryCode)                                          \
   V(Code, js_construct_entry_code, JsConstructEntryCode)                       \
   V(Code, c_entry_code, CEntryCode)                                            \
   V(Code, c_entry_debug_break_code, CEntryDebugBreakCode)                      \
   V(FixedArray, number_string_cache, NumberStringCache)                        \
   V(FixedArray, single_character_string_cache, SingleCharacterStringCache)     \
   V(FixedArray, natives_source_cache, NativesSourceCache)                      \
-  V(Object, last_script_id, LastScriptId)
+  V(Object, last_script_id, LastScriptId)                                      \
+  V(Smi, stack_limit, StackLimit)
 
 
 #define ROOT_LIST(V)                                  \
   STRONG_ROOT_LIST(V)                                 \
   V(SymbolTable, symbol_table, SymbolTable)
 
 #define SYMBOL_LIST(V)                                                   \
   V(Array_symbol, "Array")                                               \
   V(Object_symbol, "Object")                                             \
   V(Proto_symbol, "__proto__")                                           \
@@ skipping 74 matching lines @@
   static bool ConfigureHeapDefault();
 
   // Initializes the global object heap. If create_heap_objects is true,
   // also creates the basic non-mutable objects.
   // Returns whether it succeeded.
   static bool Setup(bool create_heap_objects);
 
   // Destroys all memory allocated by the heap.
   static void TearDown();
 
+  // Sets the stack limit in the in the roots_ array.  Some architectures

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

in the in the -> in the

+  // generate code that looks here, because it is faster than loading from the
+  // static jslimit_ variable.
+  static void SetStackLimit(intptr_t limit);
+
   // Returns whether Setup has been called.
   static bool HasBeenSetup();
 
   // Returns the maximum heap capacity.
   static int MaxCapacity() {
     return young_generation_size_ + old_generation_size_;
   }
   static int SemiSpaceSize() { return semispace_size_; }
   static int InitialSemiSpaceSize() { return initial_semispace_size_; }
   static int YoungGenerationSize() { return young_generation_size_; }
@@ skipping 1259 matching lines @@
   int marked_count_;
 
   // The count from the end of the previous full GC.  Will be zero if there
   // was no previous full GC.
   int previous_marked_count_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_