Make Failure inherit from MaybeObject instead of Object.

src/heap.h

 // Copyright 2010 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 298 matching lines @@
   // Protect/unprotect the heap by marking all spaces read-only/writable.
   static void Protect();
   static void Unprotect();
 #endif
 
   // Allocates and initializes a new JavaScript object based on a
   // constructor.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateJSObject(
+  MUST_USE_RESULT static MaybeObject* AllocateJSObject(
       JSFunction* constructor, PretenureFlag pretenure = NOT_TENURED);
 
   // Allocates and initializes a new global object based on a constructor.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateGlobalObject(JSFunction* constructor);
+  MUST_USE_RESULT static MaybeObject* AllocateGlobalObject(
+      JSFunction* constructor);
 
   // Returns a deep copy of the JavaScript object.
   // Properties and elements are copied too.
   // Returns failure if allocation failed.
-  MUST_USE_RESULT static Object* CopyJSObject(JSObject* source);
+  MUST_USE_RESULT static MaybeObject* CopyJSObject(JSObject* source);
 
   // Allocates the function prototype.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateFunctionPrototype(
+  MUST_USE_RESULT static MaybeObject* AllocateFunctionPrototype(
       JSFunction* function);
 
   // Reinitialize an JSGlobalProxy based on a constructor.  The object
   // must have the same size as objects allocated using the
   // constructor.  The object is reinitialized and behaves as an
   // object that has been freshly allocated using the constructor.
-  MUST_USE_RESULT static Object* ReinitializeJSGlobalProxy(
+  MUST_USE_RESULT static MaybeObject* ReinitializeJSGlobalProxy(
       JSFunction* constructor,
       JSGlobalProxy* global);
 
   // Allocates and initializes a new JavaScript object based on a map.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateJSObjectFromMap(
+  MUST_USE_RESULT static MaybeObject* AllocateJSObjectFromMap(
       Map* map, PretenureFlag pretenure = NOT_TENURED);
 
   // Allocates a heap object based on the map.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT static Object* Allocate(Map* map, AllocationSpace space);
+  MUST_USE_RESULT static MaybeObject* Allocate(Map* map, AllocationSpace space);
 
   // Allocates a JS Map in the heap.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateMap(InstanceType instance_type,
+  MUST_USE_RESULT static MaybeObject* AllocateMap(InstanceType instance_type,
                                              int instance_size);
 
   // Allocates a partial map for bootstrapping.
-  MUST_USE_RESULT static Object* AllocatePartialMap(InstanceType instance_type,
-                                                    int instance_size);
+  MUST_USE_RESULT static MaybeObject* AllocatePartialMap(
+      InstanceType instance_type,
+      int instance_size);
 
   // Allocate a map for the specified function
-  MUST_USE_RESULT static Object* AllocateInitialMap(JSFunction* fun);
+  MUST_USE_RESULT static MaybeObject* AllocateInitialMap(JSFunction* fun);
 
   // Allocates an empty code cache.
-  MUST_USE_RESULT static Object* AllocateCodeCache();
+  MUST_USE_RESULT static MaybeObject* AllocateCodeCache();
 
   // Clear the Instanceof cache (used when a prototype changes).
   static void ClearInstanceofCache() {
     set_instanceof_cache_function(the_hole_value());
   }
 
   // Allocates and fully initializes a String.  There are two String
   // encodings: ASCII and two byte. One should choose between the three string
   // allocation functions based on the encoding of the string buffer used to
   // initialized the string.
   //   - ...FromAscii initializes the string from a buffer that is ASCII
   //     encoded (it does not check that the buffer is ASCII encoded) and the
   //     result will be ASCII encoded.
   //   - ...FromUTF8 initializes the string from a buffer that is UTF-8
   //     encoded.  If the characters are all single-byte characters, the
   //     result will be ASCII encoded, otherwise it will converted to two
   //     byte.
   //   - ...FromTwoByte initializes the string from a buffer that is two-byte
   //     encoded.  If the characters are all single-byte characters, the
   //     result will be converted to ASCII, otherwise it will be left as
   //     two-byte.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateStringFromAscii(
+  MUST_USE_RESULT static MaybeObject* AllocateStringFromAscii(
       Vector<const char> str,
       PretenureFlag pretenure = NOT_TENURED);
-  MUST_USE_RESULT static Object* AllocateStringFromUtf8(
+  MUST_USE_RESULT static MaybeObject* AllocateStringFromUtf8(
       Vector<const char> str,
       PretenureFlag pretenure = NOT_TENURED);
-  MUST_USE_RESULT static Object* AllocateStringFromTwoByte(
+  MUST_USE_RESULT static MaybeObject* AllocateStringFromTwoByte(
       Vector<const uc16> str,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocates a symbol in old space based on the character stream.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT static inline Object* AllocateSymbol(Vector<const char> str,
-                                                       int chars,
-                                                       uint32_t hash_field);
+  MUST_USE_RESULT static inline MaybeObject* AllocateSymbol(
+      Vector<const char> str,
+      int chars,
+      uint32_t hash_field);
 
-  MUST_USE_RESULT static Object* AllocateInternalSymbol(
+  MUST_USE_RESULT static MaybeObject* AllocateInternalSymbol(
       unibrow::CharacterStream* buffer, int chars, uint32_t hash_field);
 
-  MUST_USE_RESULT static Object* AllocateExternalSymbol(Vector<const char> str,
-                                                        int chars);
+  MUST_USE_RESULT static MaybeObject* AllocateExternalSymbol(
+      Vector<const char> str,
+      int chars);
 
 
   // Allocates and partially initializes a String.  There are two String
   // encodings: ASCII and two byte.  These functions allocate a string of the
   // given length and set its map and length fields.  The characters of the
   // string are uninitialized.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateRawAsciiString(
+  MUST_USE_RESULT static MaybeObject* AllocateRawAsciiString(
       int length,
       PretenureFlag pretenure = NOT_TENURED);
-  MUST_USE_RESULT static Object* AllocateRawTwoByteString(
+  MUST_USE_RESULT static MaybeObject* AllocateRawTwoByteString(
       int length,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Computes a single character string where the character has code.
   // A cache is used for ascii codes.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed. Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* LookupSingleCharacterStringFromCode(
+  MUST_USE_RESULT static MaybeObject* LookupSingleCharacterStringFromCode(
       uint16_t code);
 
   // Allocate a byte array of the specified length
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateByteArray(int length,
+  MUST_USE_RESULT static MaybeObject* AllocateByteArray(int length,
                                                    PretenureFlag pretenure);
 
   // Allocate a non-tenured byte array of the specified length
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateByteArray(int length);
+  MUST_USE_RESULT static MaybeObject* AllocateByteArray(int length);
 
   // Allocate a pixel array of the specified length
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocatePixelArray(int length,
+  MUST_USE_RESULT static MaybeObject* AllocatePixelArray(int length,
                                                     uint8_t* external_pointer,
                                                     PretenureFlag pretenure);
 
   // Allocates an external array of the specified length and type.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateExternalArray(
+  MUST_USE_RESULT static MaybeObject* AllocateExternalArray(
       int length,
       ExternalArrayType array_type,
       void* external_pointer,
       PretenureFlag pretenure);
 
   // Allocate a tenured JS global property cell.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateJSGlobalPropertyCell(Object* value);
+  MUST_USE_RESULT static MaybeObject* AllocateJSGlobalPropertyCell(
+      Object* value);
 
   // Allocates a fixed array initialized with undefined values
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateFixedArray(int length,
-                                                    PretenureFlag pretenure);
+  MUST_USE_RESULT static MaybeObject* AllocateFixedArray(
+      int length,
+      PretenureFlag pretenure);
   // Allocates a fixed array initialized with undefined values
-  MUST_USE_RESULT static Object* AllocateFixedArray(int length);
+  MUST_USE_RESULT static MaybeObject* AllocateFixedArray(int length);
 
   // Allocates an uninitialized fixed array. It must be filled by the caller.
   //
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateUninitializedFixedArray(int length);
+  MUST_USE_RESULT static MaybeObject* AllocateUninitializedFixedArray(
+      int length);
 
   // Make a copy of src and return it. Returns
   // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
-  MUST_USE_RESULT static inline Object* CopyFixedArray(FixedArray* src);
+  MUST_USE_RESULT static inline MaybeObject* CopyFixedArray(FixedArray* src);
 
   // Make a copy of src, set the map, and return the copy. Returns
   // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
-  MUST_USE_RESULT static Object* CopyFixedArrayWithMap(FixedArray* src,
-                                                       Map* map);
+  MUST_USE_RESULT static MaybeObject* CopyFixedArrayWithMap(FixedArray* src,
+                                                            Map* map);
 
   // Allocates a fixed array initialized with the hole values.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateFixedArrayWithHoles(
+  MUST_USE_RESULT static MaybeObject* AllocateFixedArrayWithHoles(
       int length,
       PretenureFlag pretenure = NOT_TENURED);
 
   // AllocateHashTable is identical to AllocateFixedArray except
   // that the resulting object has hash_table_map as map.
-  MUST_USE_RESULT static Object* AllocateHashTable(
+  MUST_USE_RESULT static MaybeObject* AllocateHashTable(
       int length, PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate a global (but otherwise uninitialized) context.
-  MUST_USE_RESULT static Object* AllocateGlobalContext();
+  MUST_USE_RESULT static MaybeObject* AllocateGlobalContext();
 
   // Allocate a function context.
-  MUST_USE_RESULT static Object* AllocateFunctionContext(int length,
-                                                         JSFunction* closure);
+  MUST_USE_RESULT static MaybeObject* AllocateFunctionContext(
+      int length,
+      JSFunction* closure);
 
   // Allocate a 'with' context.
-  MUST_USE_RESULT static Object* AllocateWithContext(Context* previous,
-                                                     JSObject* extension,
-                                                     bool is_catch_context);
+  MUST_USE_RESULT static MaybeObject* AllocateWithContext(
+      Context* previous,
+      JSObject* extension,
+      bool is_catch_context);
 
   // Allocates a new utility object in the old generation.
-  MUST_USE_RESULT static Object* AllocateStruct(InstanceType type);
+  MUST_USE_RESULT static MaybeObject* AllocateStruct(InstanceType type);
 
   // Allocates a function initialized with a shared part.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateFunction(
+  MUST_USE_RESULT static MaybeObject* AllocateFunction(
       Map* function_map,
       SharedFunctionInfo* shared,
       Object* prototype,
       PretenureFlag pretenure = TENURED);
 
   // Indicies for direct access into argument objects.
   static const int kArgumentsObjectSize =
       JSObject::kHeaderSize + 2 * kPointerSize;
   static const int arguments_callee_index = 0;
   static const int arguments_length_index = 1;
 
   // Allocates an arguments object - optionally with an elements array.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateArgumentsObject(Object* callee,
-                                                         int length);
+  MUST_USE_RESULT static MaybeObject* AllocateArgumentsObject(Object* callee,
+                                                              int length);
 
   // Same as NewNumberFromDouble, but may return a preallocated/immutable
   // number object (e.g., minus_zero_value_, nan_value_)
-  MUST_USE_RESULT static Object* NumberFromDouble(
+  MUST_USE_RESULT static MaybeObject* NumberFromDouble(
       double value, PretenureFlag pretenure = NOT_TENURED);
 
   // Allocated a HeapNumber from value.
-  MUST_USE_RESULT static Object* AllocateHeapNumber(double value,
-                                                    PretenureFlag pretenure);
+  MUST_USE_RESULT static MaybeObject* AllocateHeapNumber(
+      double value,
+      PretenureFlag pretenure);
   // pretenure = NOT_TENURED.
-  MUST_USE_RESULT static Object* AllocateHeapNumber(double value);
+  MUST_USE_RESULT static MaybeObject* AllocateHeapNumber(double value);
 
   // Converts an int into either a Smi or a HeapNumber object.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static inline Object* NumberFromInt32(int32_t value);
+  MUST_USE_RESULT static inline MaybeObject* NumberFromInt32(int32_t value);
 
   // Converts an int into either a Smi or a HeapNumber object.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static inline Object* NumberFromUint32(uint32_t value);
+  MUST_USE_RESULT static inline MaybeObject* NumberFromUint32(uint32_t value);
 
   // Allocates a new proxy object.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateProxy(
+  MUST_USE_RESULT static MaybeObject* AllocateProxy(
       Address proxy,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocates a new SharedFunctionInfo object.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateSharedFunctionInfo(Object* name);
+  MUST_USE_RESULT static MaybeObject* AllocateSharedFunctionInfo(Object* name);
 
   // Allocates a new cons string object.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateConsString(String* first,
-                                                    String* second);
+  MUST_USE_RESULT static MaybeObject* AllocateConsString(String* first,
+                                                         String* second);
 
   // Allocates a new sub string object which is a substring of an underlying
   // string buffer stretching from the index start (inclusive) to the index
   // end (exclusive).
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateSubString(
+  MUST_USE_RESULT static MaybeObject* AllocateSubString(
       String* buffer,
       int start,
       int end,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate a new external string object, which is backed by a string
   // resource that resides outside the V8 heap.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static Object* AllocateExternalStringFromAscii(
+  MUST_USE_RESULT static MaybeObject* AllocateExternalStringFromAscii(
       ExternalAsciiString::Resource* resource);
-  MUST_USE_RESULT static Object* AllocateExternalStringFromTwoByte(
+  MUST_USE_RESULT static MaybeObject* AllocateExternalStringFromTwoByte(
       ExternalTwoByteString::Resource* resource);
 
   // Finalizes an external string by deleting the associated external
   // data and clearing the resource pointer.
   static inline void FinalizeExternalString(String* string);
 
   // Allocates an uninitialized object.  The memory is non-executable if the
   // hardware and OS allow.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT static inline Object* AllocateRaw(
+  MUST_USE_RESULT static inline MaybeObject* AllocateRaw(
       int size_in_bytes,
       AllocationSpace space,
       AllocationSpace retry_space);
 
   // Initialize a filler object to keep the ability to iterate over the heap
   // when shortening objects.
   static void CreateFillerObjectAt(Address addr, int size);
 
   // Makes a new native code object
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed. On success, the pointer to the Code object is stored in the
   // self_reference. This allows generated code to reference its own Code
   // object by containing this pointer.
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT static Object* CreateCode(const CodeDesc& desc,
-                                            Code::Flags flags,
-                                            Handle<Object> self_reference);
+  MUST_USE_RESULT static MaybeObject* CreateCode(const CodeDesc& desc,
+                                                 Code::Flags flags,
+                                                 Handle<Object> self_reference);
 
-  MUST_USE_RESULT static Object* CopyCode(Code* code);
+  MUST_USE_RESULT static MaybeObject* CopyCode(Code* code);
 
   // Copy the code and scope info part of the code object, but insert
   // the provided data as the relocation information.
-  MUST_USE_RESULT static Object* CopyCode(Code* code, Vector<byte> reloc_info);
+  MUST_USE_RESULT static MaybeObject* CopyCode(Code* code,
+                                               Vector<byte> reloc_info);
 
   // Finds the symbol for string in the symbol table.
   // If not found, a new symbol is added to the table and returned.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if allocation
   // failed.
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT static Object* LookupSymbol(Vector<const char> str);
-  MUST_USE_RESULT static Object* LookupAsciiSymbol(const char* str) {
+  MUST_USE_RESULT static MaybeObject* LookupSymbol(Vector<const char> str);
+  MUST_USE_RESULT static MaybeObject* LookupAsciiSymbol(const char* str) {
     return LookupSymbol(CStrVector(str));
   }
-  MUST_USE_RESULT static Object* LookupSymbol(String* str);
+  MUST_USE_RESULT static MaybeObject* LookupSymbol(String* str);
   static bool LookupSymbolIfExists(String* str, String** symbol);
   static bool LookupTwoCharsSymbolIfExists(String* str, String** symbol);
 
   // Compute the matching symbol map for a string if possible.
   // NULL is returned if string is in new space or not flattened.
   static Map* SymbolMapForString(String* str);
 
   // Tries to flatten a string before compare operation.
   //
   // Returns a failure in case it was decided that flattening was
   // necessary and failed.  Note, if flattening is not necessary the
   // string might stay non-flat even when not a failure is returned.
   //
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT static inline Object* PrepareForCompare(String* str);
+  MUST_USE_RESULT static inline MaybeObject* PrepareForCompare(String* str);
 
   // Converts the given boolean condition to JavaScript boolean value.
   static Object* ToBoolean(bool condition) {
     return condition ? true_value() : false_value();
   }
 
   // Code that should be run before and after each GC.  Includes some
   // reporting/verification activities when compiled with DEBUG set.
   static void GarbageCollectionPrologue();
   static void GarbageCollectionEpilogue();
@@ skipping 195 matching lines @@
 
 #if defined(ENABLE_LOGGING_AND_PROFILING)
   // Print short heap statistics.
   static void PrintShortHeapStatistics();
 #endif
 
   // Makes a new symbol object
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT static Object* CreateSymbol(const char* str,
-                                              int length,
-                                              int hash);
-  MUST_USE_RESULT static Object* CreateSymbol(String* str);
+  MUST_USE_RESULT static MaybeObject* CreateSymbol(const char* str,
+                                                   int length,
+                                                   int hash);
+  MUST_USE_RESULT static MaybeObject* CreateSymbol(String* str);
 
   // Write barrier support for address[offset] = o.
   static inline void RecordWrite(Address address, int offset);
 
   // Write barrier support for address[start : start + len[ = o.
   static inline void RecordWrites(Address address, int start, int len);
 
   // Given an address occupied by a live code object, return that object.
   static Object* FindCodeObject(Address a);
 
@@ skipping 51 matching lines @@
   static Object* GetNumberStringCache(Object* number);
 
   // Update the cache with a new number-string pair.
   static void SetNumberStringCache(Object* number, String* str);
 
   // Adjusts the amount of registered external memory.
   // Returns the adjusted value.
   static inline int AdjustAmountOfExternalAllocatedMemory(int change_in_bytes);
 
   // Allocate uninitialized fixed array.
-  MUST_USE_RESULT static Object* AllocateRawFixedArray(int length);
-  MUST_USE_RESULT static Object* AllocateRawFixedArray(int length,
-                                                       PretenureFlag pretenure);
+  MUST_USE_RESULT static MaybeObject* AllocateRawFixedArray(int length);
+  MUST_USE_RESULT static MaybeObject* AllocateRawFixedArray(
+      int length,
+      PretenureFlag pretenure);
 
   // True if we have reached the allocation limit in the old generation that
   // should force the next GC (caused normally) to be a full one.
   static bool OldGenerationPromotionLimitReached() {
     return (PromotedSpaceSize() + PromotedExternalMemorySize())
            > old_gen_promotion_limit_;
   }
 
   static intptr_t OldGenerationSpaceAvailable() {
     return old_gen_allocation_limit_ -
@@ skipping 22 matching lines @@
 
 #define SYMBOL_INDEX_DECLARATION(name, str) k##name##RootIndex,
     SYMBOL_LIST(SYMBOL_INDEX_DECLARATION)
 #undef SYMBOL_DECLARATION
 
     kSymbolTableRootIndex,
     kStrongRootListLength = kSymbolTableRootIndex,
     kRootListLength
   };
 
-  MUST_USE_RESULT static Object* NumberToString(
+  MUST_USE_RESULT static MaybeObject* NumberToString(
       Object* number,
       bool check_number_string_cache = true);
 
   static Map* MapForExternalArrayType(ExternalArrayType array_type);
   static RootListIndex RootIndexForExternalArrayType(
       ExternalArrayType array_type);
 
   static void RecordStats(HeapStats* stats, bool take_snapshot = false);
 
   // Copy block of memory from src to dst. Size of block should be aligned
@@ skipping 203 matching lines @@
   static GarbageCollector SelectGarbageCollector(AllocationSpace space);
 
   // Performs garbage collection
   static void PerformGarbageCollection(GarbageCollector collector,
                                        GCTracer* tracer);
 
   // Allocate an uninitialized object in map space.  The behavior is identical
   // to Heap::AllocateRaw(size_in_bytes, MAP_SPACE), except that (a) it doesn't
   // have to test the allocation space argument and (b) can reduce code size
   // (since both AllocateRaw and AllocateRawMap are inlined).
-  MUST_USE_RESULT static inline Object* AllocateRawMap();
+  MUST_USE_RESULT static inline MaybeObject* AllocateRawMap();
 
   // Allocate an uninitialized object in the global property cell space.
-  MUST_USE_RESULT static inline Object* AllocateRawCell();
+  MUST_USE_RESULT static inline MaybeObject* AllocateRawCell();
 
   // Initializes a JSObject based on its map.
   static void InitializeJSObjectFromMap(JSObject* obj,
                                         FixedArray* properties,
                                         Map* map);
 
   static bool CreateInitialMaps();
   static bool CreateInitialObjects();
 
   // These four Create*EntryStub functions are here and forced to not be inlined
   // because of a gcc-4.4 bug that assigns wrong vtable entries.
   NO_INLINE(static void CreateCEntryStub());
   NO_INLINE(static void CreateJSEntryStub());
   NO_INLINE(static void CreateJSConstructEntryStub());
   NO_INLINE(static void CreateRegExpCEntryStub());
 
   static void CreateFixedStubs();
 
-  static Object* CreateOddball(const char* to_string, Object* to_number);
+  MUST_USE_RESULT static MaybeObject* CreateOddball(const char* to_string,
+                                                    Object* to_number);
 
   // Allocate empty fixed array.
-  static Object* AllocateEmptyFixedArray();
+  MUST_USE_RESULT static MaybeObject* AllocateEmptyFixedArray();
 
   // Performs a minor collection in new generation.
   static void Scavenge();
 
   static String* UpdateNewSpaceReferenceInExternalStringTableEntry(
       Object** pointer);
 
   static Address DoScavenge(ObjectVisitor* scavenge_visitor,
                             Address new_space_front);
 
@@ skipping 18 matching lines @@
 
   // Slow part of scavenge object.
   static void ScavengeObjectSlow(HeapObject** p, HeapObject* object);
 
   // Initializes a function with a shared part and prototype.
   // Returns the function.
   // Note: this code was factored out of AllocateFunction such that
   // other parts of the VM could use it. Specifically, a function that creates
   // instances of type JS_FUNCTION_TYPE benefit from the use of this function.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT static inline Object* InitializeFunction(
+  MUST_USE_RESULT static inline MaybeObject* InitializeFunction(
       JSFunction* function,
       SharedFunctionInfo* shared,
       Object* prototype);
 
   static GCTracer* tracer_;
 
 
   // Initializes the number to string cache based on the max semispace size.
-  static Object* InitializeNumberStringCache();
+  MUST_USE_RESULT static MaybeObject* InitializeNumberStringCache();
   // Flush the number to string cache.
   static void FlushNumberStringCache();
 
   static void UpdateSurvivalRateTrend(int start_new_space_size);
 
   enum SurvivalRateTrend { INCREASING, STABLE, DECREASING, FLUCTUATING };
 
   static const int kYoungSurvivalRateThreshold = 90;
   static const int kYoungSurvivalRateAllowedDeviation = 15;
 
@@ skipping 587 matching lines @@
 
 
 class TranscendentalCache {
  public:
   enum Type {ACOS, ASIN, ATAN, COS, EXP, LOG, SIN, TAN, kNumberOfCaches};
 
   explicit TranscendentalCache(Type t);
 
   // Returns a heap number with f(input), where f is a math function specified
   // by the 'type' argument.
-  MUST_USE_RESULT static inline Object* Get(Type type, double input) {
+  MUST_USE_RESULT static inline MaybeObject* Get(Type type, double input) {
     TranscendentalCache* cache = caches_[type];
     if (cache == NULL) {
       caches_[type] = cache = new TranscendentalCache(type);
     }
     return cache->Get(input);
   }
 
   // The cache contains raw Object pointers.  This method disposes of
   // them before a garbage collection.
   static void Clear();
 
  private:
-  MUST_USE_RESULT inline Object* Get(double input) {
+  MUST_USE_RESULT inline MaybeObject* Get(double input) {
     Converter c;
     c.dbl = input;
     int hash = Hash(c);
     Element e = elements_[hash];
     if (e.in[0] == c.integers[0] &&
         e.in[1] == c.integers[1]) {
       ASSERT(e.output != NULL);
       Counters::transcendental_cache_hit.Increment();
       return e.output;
     }
     double answer = Calculate(input);
-    Object* heap_number = Heap::AllocateHeapNumber(answer);
-    if (!heap_number->IsFailure()) {
-      elements_[hash].in[0] = c.integers[0];
-      elements_[hash].in[1] = c.integers[1];
-      elements_[hash].output = heap_number;
+    Counters::transcendental_cache_miss.Increment();
+    Object* heap_number;
+    { MaybeObject* maybe_heap_number = Heap::AllocateHeapNumber(answer);
+      if (!maybe_heap_number->ToObject(&heap_number)) return maybe_heap_number;
     }
-    Counters::transcendental_cache_miss.Increment();
+    elements_[hash].in[0] = c.integers[0];
+    elements_[hash].in[1] = c.integers[1];
+    elements_[hash].output = heap_number;
     return heap_number;
   }
 
   inline double Calculate(double input) {
     switch (type_) {
       case ACOS:
         return acos(input);
       case ASIN:
         return asin(input);
       case ATAN:
@@ skipping 86 matching lines @@
   // Return whether this object should be retained. If NULL is returned the
   // object has no references. Otherwise the address of the retained object
   // should be returned as in some GC situations the object has been moved.
   virtual Object* RetainAs(Object* object) = 0;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_