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Force 8-alignment of memory blocks, as needed on

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64-bit machines that require pointers to be aligned (e.g. IA64)
This commit is contained in:
Martin v. Löwis 2006-04-13 19:16:13 +00:00
parent f33dea2961
commit da69041123
1 changed files with 8 additions and 1 deletions
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9
Python/pyarena.c
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@ -12,6 +12,11 @@
*/ */
#define DEFAULT_BLOCK_SIZE 8192 #define DEFAULT_BLOCK_SIZE 8192
#define ALIGNMENT 8
#define ALIGNMENT_SHIFT 3
#define ALIGNMENT_MASK (ALIGNMENT - 1)
#define ROUNDUP(x) (((x) + ALIGNMENT_MASK) & ~ALIGNMENT_MASK)
typedef struct _block { typedef struct _block {
/* Total number of bytes owned by this block available to pass out. /* Total number of bytes owned by this block available to pass out.
* Read-only after initialization. The first such byte starts at * Read-only after initialization. The first such byte starts at
@ -82,7 +87,8 @@ block_new(size_t size)
b->ab_size = size; b->ab_size = size;
b->ab_mem = (void *)(b + 1); b->ab_mem = (void *)(b + 1);
b->ab_next = NULL; b->ab_next = NULL;
b->ab_offset = 0; b->ab_offset = ROUNDUP((Py_uintptr_t)(b->ab_mem)) -
(Py_uintptr_t)(b->ab_mem);
return b; return b;
} }
@ -100,6 +106,7 @@ block_alloc(block *b, size_t size)
{ {
void *p; void *p;
assert(b); assert(b);
size = ROUNDUP(size);
if (b->ab_offset + size > b->ab_size) { if (b->ab_offset + size > b->ab_size) {
/* If we need to allocate more memory than will fit in /* If we need to allocate more memory than will fit in
the default block, allocate a one-off block that is the default block, allocate a one-off block that is