"git cmd :/no-such-string-ever-existed" runs an extra round of get_sha1()
since 009fee4 (Detailed diagnosis when parsing an object name fails.,
2009-12-07). Once without error diagnosis to see there is no commit with
such a string in the log message (hence "it cannot be a ref"), and after
seeing that :/no-such-string-ever-existed is not a filename (hence "it
cannot be a path, either"), another time to give "better diagnosis".
The thing is, the second time it runs, we already know that traversing the
history all the way down to the root will _not_ find any matching commit.
Rename misguided "gently" parameter, which is turned off _only_ when the
"detailed diagnosis" codepath knows that it cannot be a ref and making the
call only for the caller to die with a message. Flip its meaning (and
adjust the callers) and call it "only_to_die", which is not a great name,
but it describes far more clearly what the codepaths that switches their
behaviour based on this variable do.
On my box, the command spends ~1.8 seconds without the patch to make the
report; with the patch it spends ~1.12 seconds.
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
* Yes, we often say "this is an error path and paying the price in
performance for a better diagnosis is worth", and it is correct.
But it is not an excuse to spend unnecessary cycles.
We may want to add a guard at the beginning of die_verify_filename() to
omit the extra call to get_sha1_with_mode_1(only_to_die=1) when arg
looks like a magic pathspec, i.e. ":" followed by anything !isalnum().
cache.h | 8 ++++----
setup.c | 2 +-
sha1_name.c | 17 +++++++++--------
3 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/cache.h b/cache.h
index be6ce72..a9e6419 100644
--- a/cache.h
+++ b/cache.h
@@ -785,15 +785,15 @@ struct object_context {
};
extern int get_sha1(const char *str, unsigned char *sha1);
-extern int get_sha1_with_mode_1(const char *str, unsigned char *sha1, unsigned *mode, int gently, const char *prefix);
+extern int get_sha1_with_mode_1(const char *str, unsigned char *sha1, unsigned *mode, int only_to_die, const char *prefix);
static inline int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode)
{
- return get_sha1_with_mode_1(str, sha1, mode, 1, NULL);
+ return get_sha1_with_mode_1(str, sha1, mode, 0, NULL);
}
-extern int get_sha1_with_context_1(const char *name, unsigned char *sha1, struct object_context *orc, int gently, const char *prefix);
+extern int get_sha1_with_context_1(const char *name, unsigned char *sha1, struct object_context *orc, int only_to_die, const char *prefix);
static inline int get_sha1_with_context(const char *str, unsigned char *sha1, struct object_context *orc)
{
- return get_sha1_with_context_1(str, sha1, orc, 1, NULL);
+ return get_sha1_with_context_1(str, sha1, orc, 0, NULL);
}
extern int get_sha1_hex(const char *hex, unsigned char *sha1);
extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
diff --git a/setup.c b/setup.c
index 5048252..50e8548 100644
--- a/setup.c
+++ b/setup.c
@@ -86,7 +86,7 @@ static void NORETURN die_verify_filename(const char *prefix, const char *arg)
unsigned char sha1[20];
unsigned mode;
/* try a detailed diagnostic ... */
- get_sha1_with_mode_1(arg, sha1, &mode, 0, prefix);
+ get_sha1_with_mode_1(arg, sha1, &mode, 1, prefix);
/* ... or fall back the most general message. */
die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
"Use '--' to separate paths from revisions", arg);
diff --git a/sha1_name.c b/sha1_name.c
index faea58d..ec83611 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -1080,11 +1080,12 @@ static void diagnose_invalid_index_path(int stage,
}
-int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode, int gently, const char *prefix)
+int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode,
+ int only_to_die, const char *prefix)
{
struct object_context oc;
int ret;
- ret = get_sha1_with_context_1(name, sha1, &oc, gently, prefix);
+ ret = get_sha1_with_context_1(name, sha1, &oc, only_to_die, prefix);
*mode = oc.mode;
return ret;
}
@@ -1108,7 +1109,7 @@ static char *resolve_relative_path(const char *rel)
int get_sha1_with_context_1(const char *name, unsigned char *sha1,
struct object_context *oc,
- int gently, const char *prefix)
+ int only_to_die, const char *prefix)
{
int ret, bracket_depth;
int namelen = strlen(name);
@@ -1130,7 +1131,7 @@ int get_sha1_with_context_1(const char *name, unsigned char *sha1,
struct cache_entry *ce;
char *new_path = NULL;
int pos;
- if (namelen > 2 && name[1] == '/') {
+ if (!only_to_die && namelen > 2 && name[1] == '/') {
struct commit_list *list = NULL;
for_each_ref(handle_one_ref, &list);
return get_sha1_oneline(name + 2, sha1, list);
@@ -1173,7 +1174,7 @@ int get_sha1_with_context_1(const char *name, unsigned char *sha1,
}
pos++;
}
- if (!gently)
+ if (only_to_die && name[1] && name[1] != '/')
diagnose_invalid_index_path(stage, prefix, cp);
free(new_path);
return -1;
@@ -1189,7 +1190,7 @@ int get_sha1_with_context_1(const char *name, unsigned char *sha1,
if (*cp == ':') {
unsigned char tree_sha1[20];
char *object_name = NULL;
- if (!gently) {
+ if (only_to_die) {
object_name = xmalloc(cp-name+1);
strncpy(object_name, name, cp-name);
object_name[cp-name] = '\0';
@@ -1202,7 +1203,7 @@ int get_sha1_with_context_1(const char *name, unsigned char *sha1,
if (new_filename)
filename = new_filename;
ret = get_tree_entry(tree_sha1, filename, sha1, &oc->mode);
- if (!gently) {
+ if (only_to_die) {
diagnose_invalid_sha1_path(prefix, filename,
tree_sha1, object_name);
free(object_name);
@@ -1215,7 +1216,7 @@ int get_sha1_with_context_1(const char *name, unsigned char *sha1,
free(new_filename);
return ret;
} else {
- if (!gently)
+ if (only_to_die)
die("Invalid object name '%s'.", object_name);
}
}
--
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