Make AlwaysAllocateScope imply DisallowAllocationFailure.

src/heap.h

 // Copyright 2012 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 2131 matching lines @@
   int* free_global_handle_count;        // 18
   intptr_t* memory_allocator_size;           // 19
   intptr_t* memory_allocator_capacity;       // 20
   int* objects_per_type;                // 21
   int* size_per_type;                   // 22
   int* os_error;                        // 23
   int* end_marker;                      // 24
 };
 
 
+#ifdef DEBUG
+class DisallowAllocationFailure {
+ public:
+  inline DisallowAllocationFailure();
+  inline ~DisallowAllocationFailure();
+
+ private:
+  bool old_state_;
+};
+#endif
+
+
 class AlwaysAllocateScope {
  public:
   inline AlwaysAllocateScope();
   inline ~AlwaysAllocateScope();
+
+#ifdef DEBUG
+ private:
+  // Implicitly disable artificial allocation failures.
+  DisallowAllocationFailure disallow_allocation_failure_;
+#endif
 };
 
 
 class LinearAllocationScope {
  public:
   inline LinearAllocationScope();
   inline ~LinearAllocationScope();
 };
 
 
@@ skipping 224 matching lines @@
   };
 
   Key keys_[kLength];
   int results_[kLength];
 
   friend class Isolate;
   DISALLOW_COPY_AND_ASSIGN(DescriptorLookupCache);
 };
 
 
-#ifdef DEBUG
-class DisallowAllocationFailure {
- public:
-  inline DisallowAllocationFailure();
-  inline ~DisallowAllocationFailure();
-
- private:
-  bool old_state_;
-};
-#endif
-
-
 // A helper class to document/test C++ scopes where we do not
 // expect a GC. Usage:
 //
 // /* Allocation not allowed: we cannot handle a GC in this scope. */
 // { AssertNoAllocation nogc;
 //   ...
 // }
 class AssertNoAllocation {
  public:
   inline AssertNoAllocation();
@@ skipping 337 matching lines @@
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_