Align code entry points to 32 bytes.

src/objects.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 2237 matching lines @@
   void Relocate(int delta);
 
   // Migrate code described by desc.
   void CopyFrom(const CodeDesc& desc);
 
   // Returns the object size for a given body and sinfo size (Used for
   // allocation).
   static int SizeFor(int body_size, int sinfo_size) {
     ASSERT_SIZE_TAG_ALIGNED(body_size);
     ASSERT_SIZE_TAG_ALIGNED(sinfo_size);
-    return kHeaderSize + body_size + sinfo_size;
+    return RoundUp(kHeaderSize + body_size + sinfo_size, kCodeAlignment);
   }
 
   // Locating source position.
   int SourcePosition(Address pc);
   int SourceStatementPosition(Address pc);
 
   // Casting.
   static inline Code* cast(Object* obj);
 
   // Dispatched behavior.
   int CodeSize() { return SizeFor(body_size(), sinfo_size()); }
   void CodeIterateBody(ObjectVisitor* v);
 #ifdef DEBUG
   void CodePrint();
   void CodeVerify();
 #endif
 
   // Layout description.
   static const int kInstructionSizeOffset = HeapObject::kHeaderSize;
   static const int kRelocationSizeOffset = kInstructionSizeOffset + kIntSize;
   static const int kSInfoSizeOffset = kRelocationSizeOffset + kIntSize;
   static const int kFlagsOffset = kSInfoSizeOffset + kIntSize;
   static const int kKindSpecificFlagsOffset  = kFlagsOffset + kIntSize;
-  static const int kHeaderSize = kKindSpecificFlagsOffset + kIntSize;
+  static const int kFiller6Offset = kKindSpecificFlagsOffset + kIntSize;

[Kasper Lund, 2009/02/27 10:32:11]

Comment on why you need fillers here?

[iposva, 2009/02/27 11:08:28]

Done.

+  static const int kFiller7Offset = kFiller6Offset + kIntSize;
+  static const int kHeaderSize = kFiller7Offset + kIntSize;
+
+  // Code entry points are aligned to 32 bytes.
+  static const int kCodeAlignment = 32;
 
   // Byte offsets within kKindSpecificFlagsOffset.
   static const int kICFlagOffset = kKindSpecificFlagsOffset + 0;
   static const int kStubMajorKeyOffset = kKindSpecificFlagsOffset + 1;
 
   // Flags layout.
   static const int kFlagsICStateShift        = 0;
   static const int kFlagsKindShift           = 3;
   static const int kFlagsTypeShift           = 6;
   static const int kFlagsArgumentsCountShift = 9;
@@ skipping 1945 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_