Change the common patter in the codebase of duplicating the initialization logic between an *_INIT macro and a corresponding *_init() function to use the macro as the canonical source of truth. Now we no longer need to keep the function up-to-date with the macro version. This implements a suggestion by Jeff King who found that under -O2 [1] modern compilers will init new version in place without the extra copy[1]. The performance of a single *_init() won't matter in most cases, but even if it does we're going to be producing efficient machine code to perform these operations. 1. https://lore.kernel.org/git/YNyrDxUO1PlGJvCn@xxxxxxxxxxxxxxxxxxxxxxx/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx> --- credential.c | 4 ++-- json-writer.c | 6 ++---- run-command.c | 5 ++--- strbuf.c | 4 ++-- strmap.c | 3 ++- strvec.c | 5 ++--- 6 files changed, 12 insertions(+), 15 deletions(-) diff --git a/credential.c b/credential.c index e5202fbef26..3c05c7c6691 100644 --- a/credential.c +++ b/credential.c @@ -10,8 +10,8 @@ void credential_init(struct credential *c) { - memset(c, 0, sizeof(*c)); - c->helpers.strdup_strings = 1; + struct credential blank = CREDENTIAL_INIT; + memcpy(c, &blank, sizeof(*c)); } void credential_clear(struct credential *c) diff --git a/json-writer.c b/json-writer.c index aadb9dbddc3..f1cfd8fa8c6 100644 --- a/json-writer.c +++ b/json-writer.c @@ -3,10 +3,8 @@ void jw_init(struct json_writer *jw) { - strbuf_init(&jw->json, 0); - strbuf_init(&jw->open_stack, 0); - jw->need_comma = 0; - jw->pretty = 0; + struct json_writer blank = JSON_WRITER_INIT; + memcpy(jw, &blank, sizeof(*jw));; } void jw_release(struct json_writer *jw) diff --git a/run-command.c b/run-command.c index be6bc128cd9..8750df16d89 100644 --- a/run-command.c +++ b/run-command.c @@ -11,9 +11,8 @@ void child_process_init(struct child_process *child) { - memset(child, 0, sizeof(*child)); - strvec_init(&child->args); - strvec_init(&child->env_array); + struct child_process blank = CHILD_PROCESS_INIT; + memcpy(child, &blank, sizeof(*child)); } void child_process_clear(struct child_process *child) diff --git a/strbuf.c b/strbuf.c index 4df30b45494..c8a5789694c 100644 --- a/strbuf.c +++ b/strbuf.c @@ -52,8 +52,8 @@ char strbuf_slopbuf[1]; void strbuf_init(struct strbuf *sb, size_t hint) { - sb->alloc = sb->len = 0; - sb->buf = strbuf_slopbuf; + struct strbuf blank = STRBUF_INIT; + memcpy(sb, &blank, sizeof(*sb)); if (hint) strbuf_grow(sb, hint); } diff --git a/strmap.c b/strmap.c index 4fb9f6100ec..ee486357082 100644 --- a/strmap.c +++ b/strmap.c @@ -25,7 +25,8 @@ static struct strmap_entry *find_strmap_entry(struct strmap *map, void strmap_init(struct strmap *map) { - strmap_init_with_options(map, NULL, 1); + struct strmap blank = STRMAP_INIT; + memcpy(map, &blank, sizeof(*map)); } void strmap_init_with_options(struct strmap *map, diff --git a/strvec.c b/strvec.c index 21dce0a7a4d..61a76ce6cb9 100644 --- a/strvec.c +++ b/strvec.c @@ -6,9 +6,8 @@ const char *empty_strvec[] = { NULL }; void strvec_init(struct strvec *array) { - array->v = empty_strvec; - array->nr = 0; - array->alloc = 0; + struct strvec blank = STRVEC_INIT; + memcpy(array, &blank, sizeof(*array)); } static void strvec_push_nodup(struct strvec *array, const char *value) -- 2.32.0.623.ge833f40cd87
