Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Jim Meyering <jim@xxxxxxxxxxxx> writes:
>
>>> Thanks. I'll queue this probably in 'next' for now, but we
>>> would want a conditional workaround for git-compat-util.h before
>>> we push it out to 'master'.
Here you go.
The only changed bits (other than rebase-induced) are the
additions to Makefile, git-compat-util.h, and the log text.
>From b4ad1fc0325d0b9e2905f6fac1cda88be2a28ddf Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@xxxxxxxxxx>
Date: Thu, 31 Jan 2008 18:26:32 +0100
Subject: [PATCH] Avoid unnecessary "if-before-free" tests.
This change removes all obvious useless if-before-free tests.
E.g., it replaces code like this:
if (some_expression)
free (some_expression);
with the now-equivalent:
free (some_expression);
It is equivalent not just because POSIX has required free(NULL)
to work for a long time, but simply because it has worked for
so long that no reasonable porting target fails the test.
Here's some evidence from nearly 1.5 years ago:
http://www.winehq.org/pipermail/wine-patches/2006-October/031544.html
FYI, the change below was prepared by running the following:
git ls-files -z | xargs -0 \
perl -0x3b -pi -e \
's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+(free\s*\(\s*\1\s*\))/$2/s'
Note however, that it doesn't handle brace-enclosed blocks like
"if (x) { free (x); }". But that's ok, since there were none like
that in git sources.
Beware: if you do use the above snippet, note that it can
produce syntactically invalid C code. That happens when the
affected "if"-statement has a matching "else".
E.g., it would transform this
if (x)
free (x);
else
foo ();
into this:
free (x);
else
foo ();
There were none of those here, either.
If you're interested in automating detection of the useless
tests, you might like the useless-if-before-free script in gnulib:
[it *does* detect brace-enclosed free statements, and has a --name=S
option to make it detect free-like functions with different names]
http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=blob;f=build-aux/useless-if-before-free
Addendum:
Remove one more, slightly different, (in imap-send.c),
spotted by Jean-Luc Herren <jlh@xxxxxx>.
Provide a portability crutch, in case we ever find a system
on which free(NULL) misbehaves:
* git-compat-util.c (gitfree) [FREE_NULL_CRASHES]: Define function.
And #define free gitfree.
Suggested by Johannes Schindelin.
* Makefile [FREE_NULL_CRASHES]: Define via COMPAT_CFLAGS.
Signed-off-by: Jim Meyering <meyering@xxxxxxxxxx>
---
Makefile | 7 +++++++
builtin-blame.c | 3 +--
builtin-branch.c | 9 +++------
builtin-fast-export.c | 3 +--
builtin-http-fetch.c | 3 +--
builtin-pack-objects.c | 3 +--
builtin-revert.c | 3 +--
connect.c | 3 +--
diff.c | 9 +++------
dir.c | 3 +--
git-compat-util.h | 9 +++++++++
http-push.c | 18 ++++++------------
imap-send.c | 5 ++---
interpolate.c | 3 +--
pretty.c | 3 +--
remote.c | 3 +--
setup.c | 3 +--
sha1_name.c | 6 ++----
xdiff-interface.c | 3 +--
19 files changed, 44 insertions(+), 55 deletions(-)
diff --git a/Makefile b/Makefile
index d33a556..3caf5b8 100644
--- a/Makefile
+++ b/Makefile
@@ -144,6 +144,9 @@ all::
# is a simplified version of the merge sort used in glibc. This is
# recommended if Git triggers O(n^2) behavior in your platform's qsort().
#
+# Define FREE_NULL_CRASHES if your are on a system (e.g., SunOS4)
+# for which free(NULL) segfaults.
+#
GIT-VERSION-FILE: .FORCE-GIT-VERSION-FILE
@$(SHELL_PATH) ./GIT-VERSION-GEN
@@ -743,6 +746,10 @@ ifdef THREADED_DELTA_SEARCH
EXTLIBS += -lpthread
endif
+ifdef FREE_NULL_CRASHES
+ COMPAT_CFLAGS += -DFREE_NULL_CRASHES
+endif
+
ifeq ($(TCLTK_PATH),)
NO_TCLTK=NoThanks
endif
diff --git a/builtin-blame.c b/builtin-blame.c
index 59d7237..bfd562d 100644
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -123,8 +123,7 @@ static inline struct origin *origin_incref(struct origin *o)
static void origin_decref(struct origin *o)
{
if (o && --o->refcnt <= 0) {
- if (o->file.ptr)
- free(o->file.ptr);
+ free(o->file.ptr);
free(o);
}
}
diff --git a/builtin-branch.c b/builtin-branch.c
index 9edf2eb..7917700 100644
--- a/builtin-branch.c
+++ b/builtin-branch.c
@@ -126,8 +126,7 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
continue;
}
- if (name)
- free(name);
+ free(name);
name = xstrdup(mkpath(fmt, argv[i]));
if (!resolve_ref(name, sha1, 1, NULL)) {
@@ -172,8 +171,7 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
}
}
- if (name)
- free(name);
+ free(name);
return(ret);
}
@@ -490,8 +488,7 @@ static void create_branch(const char *name, const char *start_name,
if (write_ref_sha1(lock, sha1, msg) < 0)
die("Failed to write ref: %s.", strerror(errno));
- if (real_ref)
- free(real_ref);
+ free(real_ref);
}
static void rename_branch(const char *oldname, const char *newname, int force)
diff --git a/builtin-fast-export.c b/builtin-fast-export.c
index f741df5..49b54de 100755
--- a/builtin-fast-export.c
+++ b/builtin-fast-export.c
@@ -196,8 +196,7 @@ static void handle_commit(struct commit *commit, struct rev_info *rev)
? strlen(reencoded) : message
? strlen(message) : 0),
reencoded ? reencoded : message ? message : "");
- if (reencoded)
- free(reencoded);
+ free(reencoded);
for (i = 0, p = commit->parents; p; p = p->next) {
int mark = get_object_mark(&p->item->object);
diff --git a/builtin-http-fetch.c b/builtin-http-fetch.c
index 7f450c6..299093f 100644
--- a/builtin-http-fetch.c
+++ b/builtin-http-fetch.c
@@ -80,8 +80,7 @@ int cmd_http_fetch(int argc, const char **argv, const char *prefix)
walker_free(walker);
- if (rewritten_url)
- free(rewritten_url);
+ free(rewritten_url);
return rc;
}
diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index d2bb12e..7dff653 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -1428,8 +1428,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
* accounting lock. Compiler will optimize the strangeness
* away when THREADED_DELTA_SEARCH is not defined.
*/
- if (trg_entry->delta_data)
- free(trg_entry->delta_data);
+ free(trg_entry->delta_data);
cache_lock();
if (trg_entry->delta_data) {
delta_cache_size -= trg_entry->delta_size;
diff --git a/builtin-revert.c b/builtin-revert.c
index e219859..b6dee6a 100644
--- a/builtin-revert.c
+++ b/builtin-revert.c
@@ -397,8 +397,7 @@ static int revert_or_cherry_pick(int argc, const char **argv)
else
return execl_git_cmd("commit", "-n", "-F", defmsg, NULL);
}
- if (reencoded_message)
- free(reencoded_message);
+ free(reencoded_message);
return 0;
}
diff --git a/connect.c b/connect.c
index 5ac3572..d12b105 100644
--- a/connect.c
+++ b/connect.c
@@ -68,8 +68,7 @@ struct ref **get_remote_heads(int in, struct ref **list,
name_len = strlen(name);
if (len != name_len + 41) {
- if (server_capabilities)
- free(server_capabilities);
+ free(server_capabilities);
server_capabilities = xstrdup(name + name_len + 1);
}
diff --git a/diff.c b/diff.c
index c30c252..68a1a99 100644
--- a/diff.c
+++ b/diff.c
@@ -118,8 +118,7 @@ static int parse_funcname_pattern(const char *var, const char *ep, const char *v
pp->next = funcname_pattern_list;
funcname_pattern_list = pp;
}
- if (pp->pattern)
- free(pp->pattern);
+ free(pp->pattern);
pp->pattern = xstrdup(value);
return 0;
}
@@ -492,10 +491,8 @@ static void free_diff_words_data(struct emit_callback *ecbdata)
ecbdata->diff_words->plus.text.size)
diff_words_show(ecbdata->diff_words);
- if (ecbdata->diff_words->minus.text.ptr)
- free (ecbdata->diff_words->minus.text.ptr);
- if (ecbdata->diff_words->plus.text.ptr)
- free (ecbdata->diff_words->plus.text.ptr);
+ free (ecbdata->diff_words->minus.text.ptr);
+ free (ecbdata->diff_words->plus.text.ptr);
free(ecbdata->diff_words);
ecbdata->diff_words = NULL;
}
diff --git a/dir.c b/dir.c
index 1f507da..edc458e 100644
--- a/dir.c
+++ b/dir.c
@@ -704,8 +704,7 @@ static struct path_simplify *create_simplify(const char **pathspec)
static void free_simplify(struct path_simplify *simplify)
{
- if (simplify)
- free(simplify);
+ free(simplify);
}
int read_directory(struct dir_struct *dir, const char *path, const char *base, int baselen, const char **pathspec)
diff --git a/git-compat-util.h b/git-compat-util.h
index 2a40703..911fdec 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -225,6 +225,15 @@ static inline char *gitstrchrnul(const char *s, int c)
}
#endif
+#ifdef FREE_NULL_CRASHES
+inline void gitfree(void *ptr)
+{
+ if (ptr)
+ free(ptr);
+}
+#define free gitfree
+#endif
+
extern void release_pack_memory(size_t, int);
static inline char* xstrdup(const char *str)
diff --git a/http-push.c b/http-push.c
index 0beb740..406270f 100644
--- a/http-push.c
+++ b/http-push.c
@@ -664,8 +664,7 @@ static void release_request(struct transfer_request *request)
close(request->local_fileno);
if (request->local_stream)
fclose(request->local_stream);
- if (request->url != NULL)
- free(request->url);
+ free(request->url);
free(request);
}
@@ -1283,10 +1282,8 @@ static struct remote_lock *lock_remote(const char *path, long timeout)
strbuf_release(&in_buffer);
if (lock->token == NULL || lock->timeout <= 0) {
- if (lock->token != NULL)
- free(lock->token);
- if (lock->owner != NULL)
- free(lock->owner);
+ free(lock->token);
+ free(lock->owner);
free(url);
free(lock);
lock = NULL;
@@ -1344,8 +1341,7 @@ static int unlock_remote(struct remote_lock *lock)
prev->next = prev->next->next;
}
- if (lock->owner != NULL)
- free(lock->owner);
+ free(lock->owner);
free(lock->url);
free(lock->token);
free(lock);
@@ -2035,8 +2031,7 @@ static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
}
free(url);
- if (*symref != NULL)
- free(*symref);
+ free(*symref);
*symref = NULL;
hashclr(sha1);
@@ -2435,8 +2430,7 @@ int main(int argc, char **argv)
}
cleanup:
- if (rewritten_url)
- free(rewritten_url);
+ free(rewritten_url);
if (info_ref_lock)
unlock_remote(info_ref_lock);
free(remote);
diff --git a/imap-send.c b/imap-send.c
index 9025d9a..10cce15 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -472,7 +472,7 @@ v_issue_imap_cmd( imap_store_t *ctx, struct imap_cmd_cb *cb,
if (socket_write( &imap->buf.sock, buf, bufl ) != bufl) {
free( cmd->cmd );
free( cmd );
- if (cb && cb->data)
+ if (cb)
free( cb->data );
return NULL;
}
@@ -858,8 +858,7 @@ get_cmd_result( imap_store_t *ctx, struct imap_cmd *tcmd )
normal:
if (cmdp->cb.done)
cmdp->cb.done( ctx, cmdp, resp );
- if (cmdp->cb.data)
- free( cmdp->cb.data );
+ free( cmdp->cb.data );
free( cmdp->cmd );
free( cmdp );
if (!tcmd || tcmd == cmdp)
diff --git a/interpolate.c b/interpolate.c
index 6ef53f2..7f03bd9 100644
--- a/interpolate.c
+++ b/interpolate.c
@@ -11,8 +11,7 @@ void interp_set_entry(struct interp *table, int slot, const char *value)
char *oldval = table[slot].value;
char *newval = NULL;
- if (oldval)
- free(oldval);
+ free(oldval);
if (value)
newval = xstrdup(value);
diff --git a/pretty.c b/pretty.c
index 997f583..4bf3be2 100644
--- a/pretty.c
+++ b/pretty.c
@@ -30,8 +30,7 @@ enum cmit_fmt get_commit_format(const char *arg)
if (*arg == '=')
arg++;
if (!prefixcmp(arg, "format:")) {
- if (user_format)
- free(user_format);
+ free(user_format);
user_format = xstrdup(arg + 7);
return CMIT_FMT_USERFORMAT;
}
diff --git a/remote.c b/remote.c
index 6b56473..ae1ef57 100644
--- a/remote.c
+++ b/remote.c
@@ -506,8 +506,7 @@ void free_refs(struct ref *ref)
struct ref *next;
while (ref) {
next = ref->next;
- if (ref->peer_ref)
- free(ref->peer_ref);
+ free(ref->peer_ref);
free(ref);
ref = next;
}
diff --git a/setup.c b/setup.c
index bc80301..6c96ae8 100644
--- a/setup.c
+++ b/setup.c
@@ -448,8 +448,7 @@ int check_repository_format_version(const char *var, const char *value)
} else if (strcmp(var, "core.worktree") == 0) {
if (!value)
return config_error_nonbool(var);
- if (git_work_tree_cfg)
- free(git_work_tree_cfg);
+ free(git_work_tree_cfg);
git_work_tree_cfg = xstrdup(value);
inside_work_tree = -1;
}
diff --git a/sha1_name.c b/sha1_name.c
index c2805e7..9d088cc 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -625,8 +625,7 @@ static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
commit = pop_most_recent_commit(&list, ONELINE_SEEN);
if (!parse_object(commit->object.sha1))
continue;
- if (temp_commit_buffer)
- free(temp_commit_buffer);
+ free(temp_commit_buffer);
if (commit->buffer)
p = commit->buffer;
else {
@@ -643,8 +642,7 @@ static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
break;
}
}
- if (temp_commit_buffer)
- free(temp_commit_buffer);
+ free(temp_commit_buffer);
free_commit_list(list);
for (l = backup; l; l = l->next)
clear_commit_marks(l->item, ONELINE_SEEN);
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 4b8e5cc..bba2364 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -233,8 +233,7 @@ void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value)
expression = value;
if (regcomp(®->re, expression, 0))
die("Invalid regexp to look for hunk header: %s", expression);
- if (buffer)
- free(buffer);
+ free(buffer);
value = ep + 1;
}
}
--
1.5.4.2.185.gf5f8
-
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