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authorJunio C Hamano <gitster@pobox.com>2022-08-03 20:36:07 (GMT)
committerJunio C Hamano <gitster@pobox.com>2022-08-03 20:36:07 (GMT)
commit0f609558fc537a3e87f16e6c43eb538056878833 (patch)
treeefefd3af56c1efd9f0fcbce5aa0c9c51fb78c62e
parentacbec18d8e763069f55f895d15ebb37e9162357d (diff)
parentf7b587bf656574103a0a2ad9c2337b0d15c0e92d (diff)
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Merge branch 'pw/xdiff-alloc'
Add a level of redirection to array allocation API in xdiff part, to make it easier to share with the libgit2 project. * pw/xdiff-alloc: xdiff: introduce XDL_ALLOC_GROW() xdiff: introduce XDL_CALLOC_ARRAY() xdiff: introduce xdl_calloc xdiff: introduce XDL_ALLOC_ARRAY()
-rw-r--r--xdiff/xdiff.h1
-rw-r--r--xdiff/xdiffi.c2
-rw-r--r--xdiff/xhistogram.c19
-rw-r--r--xdiff/xmacros.h18
-rw-r--r--xdiff/xpatience.c9
-rw-r--r--xdiff/xprepare.c41
-rw-r--r--xdiff/xutils.c17
-rw-r--r--xdiff/xutils.h3
8 files changed, 60 insertions, 50 deletions
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 72e25a9..bb56b23 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -120,6 +120,7 @@ typedef struct s_bdiffparam {
#define xdl_malloc(x) xmalloc(x)
+#define xdl_calloc(n, sz) xcalloc(n, sz)
#define xdl_free(ptr) free(ptr)
#define xdl_realloc(ptr,x) xrealloc(ptr,x)
diff --git a/xdiff/xdiffi.c b/xdiff/xdiffi.c
index 758410c..53e803e 100644
--- a/xdiff/xdiffi.c
+++ b/xdiff/xdiffi.c
@@ -337,7 +337,7 @@ int xdl_do_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
* One is to store the forward path and one to store the backward path.
*/
ndiags = xe->xdf1.nreff + xe->xdf2.nreff + 3;
- if (!(kvd = (long *) xdl_malloc((2 * ndiags + 2) * sizeof(long)))) {
+ if (!XDL_ALLOC_ARRAY(kvd, 2 * ndiags + 2)) {
xdl_free_env(xe);
return -1;
diff --git a/xdiff/xhistogram.c b/xdiff/xhistogram.c
index 01decff..df90900 100644
--- a/xdiff/xhistogram.c
+++ b/xdiff/xhistogram.c
@@ -251,7 +251,7 @@ static int find_lcs(xpparam_t const *xpp, xdfenv_t *env,
int line1, int count1, int line2, int count2)
{
int b_ptr;
- int sz, ret = -1;
+ int ret = -1;
struct histindex index;
memset(&index, 0, sizeof(index));
@@ -265,23 +265,16 @@ static int find_lcs(xpparam_t const *xpp, xdfenv_t *env,
index.rcha.head = NULL;
index.table_bits = xdl_hashbits(count1);
- sz = index.records_size = 1 << index.table_bits;
- sz *= sizeof(struct record *);
- if (!(index.records = (struct record **) xdl_malloc(sz)))
+ index.records_size = 1 << index.table_bits;
+ if (!XDL_CALLOC_ARRAY(index.records, index.records_size))
goto cleanup;
- memset(index.records, 0, sz);
- sz = index.line_map_size = count1;
- sz *= sizeof(struct record *);
- if (!(index.line_map = (struct record **) xdl_malloc(sz)))
+ index.line_map_size = count1;
+ if (!XDL_CALLOC_ARRAY(index.line_map, index.line_map_size))
goto cleanup;
- memset(index.line_map, 0, sz);
- sz = index.line_map_size;
- sz *= sizeof(unsigned int);
- if (!(index.next_ptrs = (unsigned int *) xdl_malloc(sz)))
+ if (!XDL_CALLOC_ARRAY(index.next_ptrs, index.line_map_size))
goto cleanup;
- memset(index.next_ptrs, 0, sz);
/* lines / 4 + 1 comes from xprepare.c:xdl_prepare_ctx() */
if (xdl_cha_init(&index.rcha, sizeof(struct record), count1 / 4 + 1) < 0)
diff --git a/xdiff/xmacros.h b/xdiff/xmacros.h
index ae4636c..8487bb3 100644
--- a/xdiff/xmacros.h
+++ b/xdiff/xmacros.h
@@ -49,5 +49,23 @@ do { \
((unsigned long) __p[2]) << 16 | ((unsigned long) __p[3]) << 24; \
} while (0)
+/* Allocate an array of nr elements, returns NULL on failure */
+#define XDL_ALLOC_ARRAY(p, nr) \
+ ((p) = SIZE_MAX / sizeof(*(p)) >= (size_t)(nr) \
+ ? xdl_malloc((nr) * sizeof(*(p))) \
+ : NULL)
+
+/* Allocate an array of nr zeroed out elements, returns NULL on failure */
+#define XDL_CALLOC_ARRAY(p, nr) ((p) = xdl_calloc(nr, sizeof(*(p))))
+
+/*
+ * Ensure array p can accommodate at least nr elements, growing the
+ * array and updating alloc (which is the number of allocated
+ * elements) as necessary. Frees p and returns -1 on failure, returns
+ * 0 on success
+ */
+#define XDL_ALLOC_GROW(p, nr, alloc) \
+ (-!((nr) <= (alloc) || \
+ ((p) = xdl_alloc_grow_helper((p), (nr), &(alloc), sizeof(*(p))))))
#endif /* #if !defined(XMACROS_H) */
diff --git a/xdiff/xpatience.c b/xdiff/xpatience.c
index 1a21c6a..fe39c29 100644
--- a/xdiff/xpatience.c
+++ b/xdiff/xpatience.c
@@ -151,11 +151,8 @@ static int fill_hashmap(mmfile_t *file1, mmfile_t *file2,
/* We know exactly how large we want the hash map */
result->alloc = count1 * 2;
- result->entries = (struct entry *)
- xdl_malloc(result->alloc * sizeof(struct entry));
- if (!result->entries)
+ if (!XDL_CALLOC_ARRAY(result->entries, result->alloc))
return -1;
- memset(result->entries, 0, result->alloc * sizeof(struct entry));
/* First, fill with entries from the first file */
while (count1--)
@@ -200,7 +197,7 @@ static int binary_search(struct entry **sequence, int longest,
*/
static int find_longest_common_sequence(struct hashmap *map, struct entry **res)
{
- struct entry **sequence = xdl_malloc(map->nr * sizeof(struct entry *));
+ struct entry **sequence;
int longest = 0, i;
struct entry *entry;
@@ -211,7 +208,7 @@ static int find_longest_common_sequence(struct hashmap *map, struct entry **res)
*/
int anchor_i = -1;
- if (!sequence)
+ if (!XDL_ALLOC_ARRAY(sequence, map->nr))
return -1;
for (entry = map->first; entry; entry = entry->next) {
diff --git a/xdiff/xprepare.c b/xdiff/xprepare.c
index 1057527..c84549f 100644
--- a/xdiff/xprepare.c
+++ b/xdiff/xprepare.c
@@ -78,15 +78,14 @@ static int xdl_init_classifier(xdlclassifier_t *cf, long size, long flags) {
return -1;
}
- if (!(cf->rchash = (xdlclass_t **) xdl_malloc(cf->hsize * sizeof(xdlclass_t *)))) {
+ if (!XDL_CALLOC_ARRAY(cf->rchash, cf->hsize)) {
xdl_cha_free(&cf->ncha);
return -1;
}
- memset(cf->rchash, 0, cf->hsize * sizeof(xdlclass_t *));
cf->alloc = size;
- if (!(cf->rcrecs = (xdlclass_t **) xdl_malloc(cf->alloc * sizeof(xdlclass_t *)))) {
+ if (!XDL_ALLOC_ARRAY(cf->rcrecs, cf->alloc)) {
xdl_free(cf->rchash);
xdl_cha_free(&cf->ncha);
@@ -112,7 +111,6 @@ static int xdl_classify_record(unsigned int pass, xdlclassifier_t *cf, xrecord_t
long hi;
char const *line;
xdlclass_t *rcrec;
- xdlclass_t **rcrecs;
line = rec->ptr;
hi = (long) XDL_HASHLONG(rec->ha, cf->hbits);
@@ -128,14 +126,8 @@ static int xdl_classify_record(unsigned int pass, xdlclassifier_t *cf, xrecord_t
return -1;
}
rcrec->idx = cf->count++;
- if (cf->count > cf->alloc) {
- cf->alloc *= 2;
- if (!(rcrecs = (xdlclass_t **) xdl_realloc(cf->rcrecs, cf->alloc * sizeof(xdlclass_t *)))) {
-
+ if (XDL_ALLOC_GROW(cf->rcrecs, cf->count, cf->alloc))
return -1;
- }
- cf->rcrecs = rcrecs;
- }
cf->rcrecs[rcrec->idx] = rcrec;
rcrec->line = line;
rcrec->size = rec->size;
@@ -164,7 +156,7 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
unsigned long hav;
char const *blk, *cur, *top, *prev;
xrecord_t *crec;
- xrecord_t **recs, **rrecs;
+ xrecord_t **recs;
xrecord_t **rhash;
unsigned long *ha;
char *rchg;
@@ -178,26 +170,21 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
if (xdl_cha_init(&xdf->rcha, sizeof(xrecord_t), narec / 4 + 1) < 0)
goto abort;
- if (!(recs = (xrecord_t **) xdl_malloc(narec * sizeof(xrecord_t *))))
+ if (!XDL_ALLOC_ARRAY(recs, narec))
goto abort;
hbits = xdl_hashbits((unsigned int) narec);
hsize = 1 << hbits;
- if (!(rhash = (xrecord_t **) xdl_malloc(hsize * sizeof(xrecord_t *))))
+ if (!XDL_CALLOC_ARRAY(rhash, hsize))
goto abort;
- memset(rhash, 0, hsize * sizeof(xrecord_t *));
nrec = 0;
if ((cur = blk = xdl_mmfile_first(mf, &bsize))) {
for (top = blk + bsize; cur < top; ) {
prev = cur;
hav = xdl_hash_record(&cur, top, xpp->flags);
- if (nrec >= narec) {
- narec *= 2;
- if (!(rrecs = (xrecord_t **) xdl_realloc(recs, narec * sizeof(xrecord_t *))))
- goto abort;
- recs = rrecs;
- }
+ if (XDL_ALLOC_GROW(recs, nrec + 1, narec))
+ goto abort;
if (!(crec = xdl_cha_alloc(&xdf->rcha)))
goto abort;
crec->ptr = prev;
@@ -209,15 +196,14 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
}
}
- if (!(rchg = (char *) xdl_malloc((nrec + 2) * sizeof(char))))
+ if (!XDL_CALLOC_ARRAY(rchg, nrec + 2))
goto abort;
- memset(rchg, 0, (nrec + 2) * sizeof(char));
if ((XDF_DIFF_ALG(xpp->flags) != XDF_PATIENCE_DIFF) &&
(XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF)) {
- if (!(rindex = xdl_malloc((nrec + 1) * sizeof(*rindex))))
+ if (!XDL_ALLOC_ARRAY(rindex, nrec + 1))
goto abort;
- if (!(ha = xdl_malloc((nrec + 1) * sizeof(*ha))))
+ if (!XDL_ALLOC_ARRAY(ha, nrec + 1))
goto abort;
}
@@ -383,11 +369,8 @@ static int xdl_cleanup_records(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xd
xdlclass_t *rcrec;
char *dis, *dis1, *dis2;
- if (!(dis = (char *) xdl_malloc(xdf1->nrec + xdf2->nrec + 2))) {
-
+ if (!XDL_CALLOC_ARRAY(dis, xdf1->nrec + xdf2->nrec + 2))
return -1;
- }
- memset(dis, 0, xdf1->nrec + xdf2->nrec + 2);
dis1 = dis;
dis2 = dis1 + xdf1->nrec + 1;
diff --git a/xdiff/xutils.c b/xdiff/xutils.c
index 115b2b1..9e36f24 100644
--- a/xdiff/xutils.c
+++ b/xdiff/xutils.c
@@ -432,3 +432,20 @@ int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp,
return 0;
}
+
+void* xdl_alloc_grow_helper(void *p, long nr, long *alloc, size_t size)
+{
+ void *tmp = NULL;
+ size_t n = ((LONG_MAX - 16) / 2 >= *alloc) ? 2 * *alloc + 16 : LONG_MAX;
+ if (nr > n)
+ n = nr;
+ if (SIZE_MAX / size >= n)
+ tmp = xdl_realloc(p, n * size);
+ if (tmp) {
+ *alloc = n;
+ } else {
+ xdl_free(p);
+ *alloc = 0;
+ }
+ return tmp;
+}
diff --git a/xdiff/xutils.h b/xdiff/xutils.h
index fba7bae..fd0bba9 100644
--- a/xdiff/xutils.h
+++ b/xdiff/xutils.h
@@ -42,6 +42,7 @@ int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp,
int line1, int count1, int line2, int count2);
-
+/* Do not call this function, use XDL_ALLOC_GROW instead */
+void* xdl_alloc_grow_helper(void* p, long nr, long* alloc, size_t size);
#endif /* #if !defined(XUTILS_H) */