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Add the SQLITE_4_BYTE_ALIGNED_MALLOC compile-time option which tells some

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assert() statements that the underlying system only requires 4-byte alignment
of 8-byte data objects like double or int64 and that system malloc() only
guarantees 4-byte alignment of returned pointers.

FossilOrigin-Name: 08faee686eb2fabe0dde51231ee55880e78541e8
This commit is contained in:
drh
2009-12-04 23:10:12 +00:00
parent 44a1d92050
commit 8e14c59611
3 changed files with 22 additions and 12 deletions
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14
src/sqliteInt.h
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@@ -484,9 +484,19 @@ extern const int sqlite3one;
#define ROUNDDOWN8(x) ((x)&~7)
/*
** Assert that the pointer X is aligned to an 8-byte boundary.
** Assert that the pointer X is aligned to an 8-byte boundary. This
** macro is used only within assert() to verify that the code gets
** all alignment restrictions correct.
**
** Except, if SQLITE_4_BYTE_ALIGNED_MALLOC is defined, then the
** underlying malloc() implemention might return us 4-byte aligned
** pointers. In that case, only verify 4-byte alignment.
*/
#define EIGHT_BYTE_ALIGNMENT(X) ((((char*)(X) - (char*)0)&7)==0)
#ifdef SQLITE_4_BYTE_ALIGNED_MALLOC
# define EIGHT_BYTE_ALIGNMENT(X) ((((char*)(X) - (char*)0)&3)==0)
#else
# define EIGHT_BYTE_ALIGNMENT(X) ((((char*)(X) - (char*)0)&7)==0)
#endif
/*