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Change the order of the retain count and the padding, so the retain count is

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always the word before isa.

Switch to using the correct kind of alignof (the ABI alignment in structures,
not the preferred alignment of the type - this stops us from allocating 4 bytes
of padding on x86-32 where there is no need for any)



git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@33642 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
David Chisnall 2011-07-26 20:08:10 +00:00
parent 7698b8d176
commit 48e1b94ef8
1 changed files with 3 additions and 3 deletions
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6
Source/NSObject.m
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@ -398,11 +398,11 @@ static inline NSLock *GSAllocationLockForObject(id p)
#endif
#ifdef ALIGN
#undef ALIGN
#endif
#define ALIGN __alignof__(double)
#define alignof(type) __builtin_offsetof(struct { const char c; type member; }, member)
#define ALIGN alignof(double)
/*
* Define a structure to hold information that is held locally
@ -419,8 +419,8 @@ typedef struct obj_layout_unpadded {
* structure correct.
*/
struct obj_layout {
NSUInteger retained;
char padding[ALIGN - ((UNP % ALIGN) ? (UNP % ALIGN) : ALIGN)];
NSUInteger retained;
};
typedef struct obj_layout *obj;