Changeset: efa49c6218dc for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=efa49c6218dc
Modified Files:
gdk/gdk_utils.mx
Branch: Aug2011
Log Message:
Parametrize amount of extra space allocated by GDKmalloc.
diffs (109 lines):
diff --git a/gdk/gdk_utils.mx b/gdk/gdk_utils.mx
--- a/gdk/gdk_utils.mx
+++ b/gdk/gdk_utils.mx
@@ -1143,29 +1143,33 @@ GDKmemfail(str s, size_t len, size_t mem
#define GLIBC_BUG 0
#endif
+/* we allocate extra space and return a pointer offset by this amount */
+#define MALLOC_EXTRA_SPACE 8
+
#ifndef GDK_MEM_MISALIGN
-/* allocate 8 bytes extra (so it stays 8-bytes aligned) and put realsize in
front */
+/* allocate 8 bytes extra (so it stays 8-bytes aligned) and put
+ * realsize in front */
#define GDKmalloc_prefixsize(s,size) { \
- s = (ssize_t *) malloc(size + 8 + GLIBC_BUG); \
+ s = (ssize_t *) malloc(size + MALLOC_EXTRA_SPACE + GLIBC_BUG); \
if (s != NULL) { \
assert((((size_t) s)&7) == 0); /* no MISALIGN */ \
- s = (ssize_t*) ((char*) s + 8); \
- s[-1] = (ssize_t) (size + 8); \
+ s = (ssize_t*) ((char*) s + MALLOC_EXTRA_SPACE); \
+ s[-1] = (ssize_t) (size + MALLOC_EXTRA_SPACE); \
} \
}
#else
/* work around old stupid libc mallocs that give 4-byte aligned pointers */
#define GDKmalloc_prefixsize(s,size) { \
- s = (ssize_t *) malloc(size+8); \
+ s = (ssize_t *) malloc(size + MALLOC_EXTRA_SPACE); \
if (((size_t) s) & 4) { /* misaligned */ \
assert(sizeof(size_t) == 4); /* not on 64-bits */ \
s = (ssize_t*) ((char*) s + 4); \
- s[-1] = (ssize_t) (size + 9); /* 1-bit is a marker */ \
+ s[-1] = (ssize_t) (size + MALLOC_EXTRA_SPACE + 1); /* 1-bit is
a marker */ \
} else if (s != NULL) { \
- s = (ssize_t*) ((char*) s + 8); \
- s[-1] = (ssize_t) (size + 8); \
+ s = (ssize_t*) ((char*) s + MALLOC_EXTRA_SPACE); \
+ s[-1] = (ssize_t) (size + MALLOC_EXTRA_SPACE); \
} \
}
#endif
@@ -1222,7 +1226,7 @@ GDKmallocmax(size_t size, size_t *maxsiz
}
}
*maxsize = size;
- @:heapinc(size+8,s)@
+ @:heapinc(size+MALLOC_EXTRA_SPACE,s)@
return (void *) s;
}
@@ -1287,14 +1291,14 @@ GDKfree_(void *blk)
* when configured with --enable-assert).
* Disable at command line using --debug=33554432
*/
- DEADBEEFCHK memset(s, 0xDB, size - (8 + (size & 1))); /*
0xDeadBeef */
+ DEADBEEFCHK memset(s, 0xDB, size - (MALLOC_EXTRA_SPACE + (size
& 1))); /* 0xDeadBeef */
#endif
#ifdef GDK_MEM_MISALIGN
if (size & 1)
free(((char *) s) - 4);
else
#endif
- free(((char *) s) - 8);
+ free(((char *) s) - MALLOC_EXTRA_SPACE);
@:heapdec(size,s)@
}
}
@@ -1347,13 +1351,13 @@ GDKreallocmax(void *blk, size_t size, si
}
#ifndef GDK_MEM_MISALIGN
else if (size <= GDK_mem_bigsize) {
- size_t newsize = size + 8;
+ size_t newsize = size + MALLOC_EXTRA_SPACE;
CHKMEM(newsize, 0);
- blk = realloc(((char *) blk) - 8, newsize + GLIBC_BUG);
+ blk = realloc(((char *) blk) - MALLOC_EXTRA_SPACE, newsize +
GLIBC_BUG);
if (blk == NULL) {
GDKmemfail("GDKrealloc", newsize, BBPTRIM_ALL, 0);
- blk = realloc(((char *) oldblk) - 8, newsize);
+ blk = realloc(((char *) oldblk) - MALLOC_EXTRA_SPACE,
newsize);
if (blk == NULL) {
if (emergency == 0) {
GDKerror("GDKreallocmax: failed for "
SZFMT " bytes", newsize);
@@ -1366,9 +1370,9 @@ GDKreallocmax(void *blk, size_t size, si
}
}
if (blk != NULL) {
- /* place 8 bytes before it */
+ /* place MALLOC_EXTRA_SPACE bytes before it */
assert((((size_t) blk) & 4) == 0);
- blk = ((char *) blk) + 8;
+ blk = ((char *) blk) + MALLOC_EXTRA_SPACE;
((ssize_t *) blk)[-1] = (ssize_t) newsize;
/* adapt statistics */
@@ -1385,7 +1389,7 @@ GDKreallocmax(void *blk, size_t size, si
oldsize = MIN((ssize_t) size, oldsize - 5);
else
#endif
- oldsize = MIN((ssize_t) size, oldsize - 8);
+ oldsize = MIN((ssize_t) size, oldsize - MALLOC_EXTRA_SPACE);
blk = GDKmallocmax(size, maxsize, emergency);
if (blk) {
memcpy(blk, oldblk, oldsize);
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