Kiss goodbye to MaybeObject.

src/v8globals.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_V8GLOBALS_H_
 #define V8_V8GLOBALS_H_
 
 #include "globals.h"
 #include "checks.h"
 
@@ skipping 18 matching lines @@
 const intptr_t kDoubleAlignment = 8;
 const intptr_t kDoubleAlignmentMask = kDoubleAlignment - 1;
 
 // Desired alignment for generated code is 32 bytes (to improve cache line
 // utilization).
 const int kCodeAlignmentBits = 5;
 const intptr_t kCodeAlignment = 1 << kCodeAlignmentBits;
 const intptr_t kCodeAlignmentMask = kCodeAlignment - 1;
 
 // Tag information for Failure.
+// TODO(yangguo): remove this from space owner calculation.
 const int kFailureTag = 3;
 const int kFailureTagSize = 2;
 const intptr_t kFailureTagMask = (1 << kFailureTagSize) - 1;
 
 
 // Zap-value: The value used for zapping dead objects.
 // Should be a recognizable hex value tagged as a failure.
 #ifdef V8_HOST_ARCH_64_BIT
 const Address kZapValue =
     reinterpret_cast<Address>(V8_UINT64_C(0xdeadbeedbeadbeef));
@@ skipping 68 matching lines @@
 class JSFunction;
 class JSObject;
 class LargeObjectSpace;
 class LookupResult;
 class MacroAssembler;
 class Map;
 class MapSpace;
 class MarkCompactCollector;
 class NewSpace;
 class Object;
-class MaybeObject;
 class OldSpace;
 class Foreign;
 class Scope;
 class ScopeInfo;
 class Script;
 class Smi;
 template <typename Config, class Allocator = FreeStoreAllocationPolicy>
     class SplayTree;
 class String;
 class Name;
@@ skipping 17 matching lines @@
 // consecutive.
 enum AllocationSpace {
   NEW_SPACE,            // Semispaces collected with copying collector.
   OLD_POINTER_SPACE,    // May contain pointers to new space.
   OLD_DATA_SPACE,       // Must not have pointers to new space.
   CODE_SPACE,           // No pointers to new space, marked executable.
   MAP_SPACE,            // Only and all map objects.
   CELL_SPACE,           // Only and all cell objects.
   PROPERTY_CELL_SPACE,  // Only and all global property cell objects.
   LO_SPACE,             // Promoted large objects.
+  INVALID_SPACE,

[Hannes Payer (out of office), 2014/04/30 07:07:07]

Can we have a comment here?

 
   FIRST_SPACE = NEW_SPACE,
   LAST_SPACE = LO_SPACE,
   FIRST_PAGED_SPACE = OLD_POINTER_SPACE,
   LAST_PAGED_SPACE = PROPERTY_CELL_SPACE
 };
 const int kSpaceTagSize = 3;
 const int kSpaceTagMask = (1 << kSpaceTagSize) - 1;
 
 
@@ skipping 364 matching lines @@
 enum MinusZeroMode {
   TREAT_MINUS_ZERO_AS_ZERO,
   FAIL_ON_MINUS_ZERO
 };
 
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_V8GLOBALS_H_