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-rw-r--r--lib/ccan/likely/likely.c120
-rw-r--r--lib/ccan/likely/likely.h9
-rw-r--r--lib/ccan/likely/test/run-debug.c17
3 files changed, 80 insertions, 66 deletions
diff --git a/lib/ccan/likely/likely.c b/lib/ccan/likely/likely.c
index faa2bd8eb8..1114efc207 100644
--- a/lib/ccan/likely/likely.c
+++ b/lib/ccan/likely/likely.c
@@ -2,11 +2,9 @@
#ifdef CCAN_LIKELY_DEBUG
#include <ccan/likely/likely.h>
#include <ccan/hash/hash.h>
-#include <ccan/htable/htable.h>
+#include <ccan/htable/htable_type.h>
#include <stdlib.h>
#include <stdio.h>
-static struct htable *htable;
-
struct trace {
const char *condstr;
const char *file;
@@ -15,27 +13,27 @@ struct trace {
unsigned long count, right;
};
-/* We hash the pointers, which will be identical for same call. */
-static unsigned long hash_trace(const struct trace *trace)
+static size_t hash_trace(const struct trace *trace)
{
- return hash_pointer(trace->condstr,
- hash_pointer(trace->file,
- trace->line + trace->expect));
+ return hash(trace->condstr, strlen(trace->condstr),
+ hash(trace->file, strlen(trace->file),
+ trace->line + trace->expect));
}
-static bool hash_cmp(const void *htelem, void *cmpdata)
+static bool trace_eq(const struct trace *t1, const struct trace *t2)
{
- const struct trace *t1 = htelem, *t2 = cmpdata;
return t1->condstr == t2->condstr
&& t1->file == t2->file
&& t1->line == t2->line
&& t1->expect == t2->expect;
}
-static size_t rehash(const void *elem, void *priv)
-{
- return hash_trace(elem);
-}
+/* struct thash */
+HTABLE_DEFINE_TYPE(struct trace, (const struct trace *), hash_trace, trace_eq,
+ thash);
+
+static struct thash htable
+= { HTABLE_INITIALIZER(htable.raw, thash_hash, NULL) };
static void init_trace(struct trace *trace,
const char *condstr, const char *file, unsigned int line,
@@ -48,12 +46,11 @@ static void init_trace(struct trace *trace,
trace->count = trace->right = 0;
}
-static struct trace *add_trace(const char *condstr,
- const char *file, unsigned int line, bool expect)
+static struct trace *add_trace(const struct trace *t)
{
struct trace *trace = malloc(sizeof(*trace));
- init_trace(trace, condstr, file, line, expect);
- htable_add(htable, hash_trace(trace), trace);
+ *trace = *t;
+ thash_add(&htable, trace);
return trace;
}
@@ -63,13 +60,10 @@ long _likely_trace(bool cond, bool expect,
{
struct trace *p, trace;
- if (!htable)
- htable = htable_new(rehash, NULL);
-
init_trace(&trace, condstr, file, line, expect);
- p = htable_get(htable, hash_trace(&trace), hash_cmp, &trace);
+ p = thash_get(&htable, &trace);
if (!p)
- p = add_trace(condstr, file, line, expect);
+ p = add_trace(&trace);
p->count++;
if (cond == expect)
@@ -78,65 +72,65 @@ long _likely_trace(bool cond, bool expect,
return cond;
}
-struct get_stats_info {
- struct trace *worst;
- unsigned int min_hits;
- double worst_ratio;
-};
-
static double right_ratio(const struct trace *t)
{
return (double)t->right / t->count;
}
-static void get_stats(struct trace *trace, struct get_stats_info *info)
+char *likely_stats(unsigned int min_hits, unsigned int percent)
{
- if (trace->count < info->min_hits)
- return;
-
- if (right_ratio(trace) < info->worst_ratio) {
- info->worst = trace;
- info->worst_ratio = right_ratio(trace);
- }
-}
-
-const char *likely_stats(unsigned int min_hits, unsigned int percent)
-{
- struct get_stats_info info;
- struct htable_iter i;
+ struct trace *worst;
+ double worst_ratio;
+ struct thash_iter i;
char *ret;
- struct trace *trace;
-
- if (!htable)
- return NULL;
+ struct trace *t;
- info.min_hits = min_hits;
- info.worst = NULL;
- info.worst_ratio = 2;
+ worst = NULL;
+ worst_ratio = 2;
/* This is O(n), but it's not likely called that often. */
- for (trace = htable_first(htable, &i);
- trace;
- trace = htable_next(htable,&i)) {
- get_stats(trace, &info);
+ for (t = thash_first(&htable, &i); t; t = thash_next(&htable, &i)) {
+ if (t->count >= min_hits) {
+ if (right_ratio(t) < worst_ratio) {
+ worst = t;
+ worst_ratio = right_ratio(t);
+ }
+ }
}
- if (info.worst_ratio * 100 > percent)
+ if (worst_ratio * 100 > percent)
return NULL;
- ret = malloc(strlen(info.worst->condstr) +
- strlen(info.worst->file) +
+ ret = malloc(strlen(worst->condstr) +
+ strlen(worst->file) +
sizeof(long int) * 8 +
sizeof("%s:%u:%slikely(%s) correct %u%% (%lu/%lu)"));
sprintf(ret, "%s:%u:%slikely(%s) correct %u%% (%lu/%lu)",
- info.worst->file, info.worst->line,
- info.worst->expect ? "" : "un", info.worst->condstr,
- (unsigned)(info.worst_ratio * 100),
- info.worst->right, info.worst->count);
+ worst->file, worst->line,
+ worst->expect ? "" : "un", worst->condstr,
+ (unsigned)(worst_ratio * 100),
+ worst->right, worst->count);
- htable_del(htable, hash_trace(info.worst), info.worst);
- free(info.worst);
+ thash_del(&htable, worst);
+ free(worst);
return ret;
}
+
+void likely_stats_reset(void)
+{
+ struct thash_iter i;
+ struct trace *t;
+
+ /* This is a bit better than O(n^2), but we have to loop since
+ * first/next during delete is unreliable. */
+ while ((t = thash_first(&htable, &i)) != NULL) {
+ for (; t; t = thash_next(&htable, &i)) {
+ thash_del(&htable, t);
+ free(t);
+ }
+ }
+
+ thash_clear(&htable);
+}
#endif /*CCAN_LIKELY_DEBUG*/
diff --git a/lib/ccan/likely/likely.h b/lib/ccan/likely/likely.h
index 3a9c6d4640..8b72995dd4 100644
--- a/lib/ccan/likely/likely.h
+++ b/lib/ccan/likely/likely.h
@@ -109,6 +109,13 @@ long _likely_trace(bool cond, bool expect,
* #endif
* }
*/
-const char *likely_stats(unsigned int min_hits, unsigned int percent);
+char *likely_stats(unsigned int min_hits, unsigned int percent);
+
+/**
+ * likely_stats_reset - free up memory of likely()/unlikely() branches.
+ *
+ * This can also plug memory leaks.
+ */
+void likely_stats_reset(void);
#endif /* CCAN_LIKELY_DEBUG */
#endif /* CCAN_LIKELY_H */
diff --git a/lib/ccan/likely/test/run-debug.c b/lib/ccan/likely/test/run-debug.c
index df78619271..afb21e2be2 100644
--- a/lib/ccan/likely/test/run-debug.c
+++ b/lib/ccan/likely/test/run-debug.c
@@ -28,9 +28,9 @@ static bool likely_one_unlikely_two(unsigned int val1, unsigned int val2)
int main(int argc, char *argv[])
{
- const char *bad;
+ char *bad;
- plan_tests(13);
+ plan_tests(14);
/* Correct guesses. */
one_seems_likely(1);
@@ -46,6 +46,7 @@ int main(int argc, char *argv[])
bad = likely_stats(3, 90);
ok(strends(bad, "run-debug.c:9:likely(val == 1) correct 33% (1/3)"),
"likely_stats returned %s", bad);
+ free(bad);
/* Nothing else above 90% */
ok1(!likely_stats(0, 90));
@@ -54,6 +55,7 @@ int main(int argc, char *argv[])
bad = likely_stats(0, 100);
ok(strends(bad, "run-debug.c:16:unlikely(val == 1) correct 100% (1/1)"),
"likely_stats returned %s", bad);
+ free(bad);
/* Nothing left (table is actually cleared) */
ok1(!likely_stats(0, 100));
@@ -66,6 +68,7 @@ int main(int argc, char *argv[])
bad = likely_stats(0, 90);
ok(strends(bad, "run-debug.c:16:unlikely(val == 1) correct 66% (2/3)"),
"likely_stats returned %s", bad);
+ free(bad);
ok1(!likely_stats(0, 100));
likely_one_unlikely_two(1, 1);
@@ -77,9 +80,19 @@ int main(int argc, char *argv[])
bad = likely_stats(0, 90);
ok(strends(bad, "run-debug.c:24:unlikely(val2 == 2) correct 75% (3/4)"),
"likely_stats returned %s", bad);
+ free(bad);
bad = likely_stats(0, 100);
ok(strends(bad, "run-debug.c:24:likely(val1 == 1) correct 100% (4/4)"),
"likely_stats returned %s", bad);
+ free(bad);
+
+ ok1(!likely_stats(0, 100));
+
+ /* Check that reset works! */
+ one_seems_unlikely(0);
+ one_seems_unlikely(2);
+ one_seems_unlikely(1);
+ likely_stats_reset();
ok1(!likely_stats(0, 100));
generated by cgit (git 2.34.1) at 2024-11-22 09:29:40 +0000