From 60a12722ac80bc55b43581a7719d25d1bb7a9882 Mon Sep 17 00:00:00 2001 From: Brandon Williams Date: Fri, 27 Jan 2017 18:02:03 -0800 Subject: attr: remove maybe-real, maybe-macro from git_attr Whether or not a git attribute is real or a macro isn't a property of the attribute but rather it depends on the attribute stack (which .gitattribute files were read). This patch removes the 'maybe_real' and 'maybe_macro' fields in a git_attr and instead adds the 'macro' field to a attr_check_item. The 'macro' indicates (if non-NULL) that a particular attribute is a macro for the given attribute stack. It's populated, through a quick scan of the attribute stack, with the match_attr that corresponds to the macro's definition. This way the attribute stack only needs to be scanned a single time prior to attribute collection instead of each time a macro needs to be expanded. Signed-off-by: Brandon Williams Signed-off-by: Junio C Hamano --- attr.c | 75 +++++++++++++++++++++++++++++++++--------------------------------- 1 file changed, 37 insertions(+), 38 deletions(-) (limited to 'attr.c') diff --git a/attr.c b/attr.c index 2637804b1..8f4402ef3 100644 --- a/attr.c +++ b/attr.c @@ -30,20 +30,9 @@ static const char git_attr__unknown[] = "(builtin)unknown"; struct git_attr { int attr_nr; /* unique attribute number */ - int maybe_macro; - int maybe_real; char name[FLEX_ARRAY]; /* attribute name */ }; -/* - * NEEDSWORK: maybe-real, maybe-macro are not property of - * an attribute, as it depends on what .gitattributes are - * read. Once we introduce per git_attr_check attr_stack - * and check_all_attr, the optimization based on them will - * become unnecessary and can go away. So is this variable. - */ -static int cannot_trust_maybe_real; - const char *git_attr_name(const struct git_attr *attr) { return attr->name; @@ -142,6 +131,12 @@ static void attr_hashmap_add(struct attr_hashmap *map, struct all_attrs_item { const struct git_attr *attr; const char *value; + /* + * If 'macro' is non-NULL, indicates that 'attr' is a macro based on + * the current attribute stack and contains a pointer to the match_attr + * definition of the macro + */ + const struct match_attr *macro; }; /* @@ -187,6 +182,7 @@ static void all_attrs_init(struct attr_hashmap *map, struct attr_check *check) */ for (i = 0; i < check->all_attrs_nr; i++) { check->all_attrs[i].value = ATTR__UNKNOWN; + check->all_attrs[i].macro = NULL; } } @@ -238,8 +234,6 @@ static struct git_attr *git_attr_internal(const char *name, int namelen) if (!a) { FLEX_ALLOC_MEM(a, name, name, namelen); a->attr_nr = g_attr_hashmap.map.size; - a->maybe_real = 0; - a->maybe_macro = 0; attr_hashmap_add(&g_attr_hashmap, a->name, namelen, a); assert(a->attr_nr == (g_attr_hashmap.map.size - 1)); @@ -402,7 +396,6 @@ static struct match_attr *parse_attr_line(const char *line, const char *src, (is_macro ? 0 : namelen + 1)); if (is_macro) { res->u.attr = git_attr_internal(name, namelen); - res->u.attr->maybe_macro = 1; } else { char *p = (char *)&(res->state[num_attr]); memcpy(p, name, namelen); @@ -423,10 +416,6 @@ static struct match_attr *parse_attr_line(const char *line, const char *src, /* Second pass to fill the attr_states */ for (cp = states, i = 0; *cp; i++) { cp = parse_attr(src, lineno, cp, &(res->state[i])); - if (!is_macro) - res->state[i].attr->maybe_real = 1; - if (res->state[i].attr->maybe_macro) - cannot_trust_maybe_real = 1; } strbuf_release(&pattern); @@ -904,7 +893,7 @@ static int path_matches(const char *pathname, int pathlen, static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem); static int fill_one(const char *what, struct all_attrs_item *all_attrs, - struct match_attr *a, int rem) + const struct match_attr *a, int rem) { int i; @@ -945,24 +934,34 @@ static int fill(const char *path, int pathlen, int basename_offset, static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem) { - struct attr_stack *stk; - int i; + const struct all_attrs_item *item = &all_attrs[nr]; - if (all_attrs[nr].value != ATTR__TRUE || - !all_attrs[nr].attr->maybe_macro) + if (item->macro && item->value == ATTR__TRUE) + return fill_one("expand", all_attrs, item->macro, rem); + else return rem; +} - for (stk = attr_stack; stk; stk = stk->prev) { - for (i = stk->num_matches - 1; 0 <= i; i--) { - struct match_attr *ma = stk->attrs[i]; - if (!ma->is_macro) - continue; - if (ma->u.attr->attr_nr == nr) - return fill_one("expand", all_attrs, ma, rem); +/* + * Marks the attributes which are macros based on the attribute stack. + * This prevents having to search through the attribute stack each time + * a macro needs to be expanded during the fill stage. + */ +static void determine_macros(struct all_attrs_item *all_attrs, + const struct attr_stack *stack) +{ + for (; stack; stack = stack->prev) { + int i; + for (i = stack->num_matches - 1; i >= 0; i--) { + const struct match_attr *ma = stack->attrs[i]; + if (ma->is_macro) { + int n = ma->u.attr->attr_nr; + if (!all_attrs[n].macro) { + all_attrs[n].macro = ma; + } + } } } - - return rem; } /* @@ -992,15 +991,15 @@ static void collect_some_attrs(const char *path, struct attr_check *check) prepare_attr_stack(path, dirlen); all_attrs_init(&g_attr_hashmap, check); + determine_macros(check->all_attrs, attr_stack); - if (check->nr && !cannot_trust_maybe_real) { + if (check->nr) { rem = 0; for (i = 0; i < check->nr; i++) { - const struct git_attr *a = check->items[i].attr; - if (!a->maybe_real) { - struct all_attrs_item *c; - c = check->all_attrs + a->attr_nr; - c->value = ATTR__UNSET; + int n = check->items[i].attr->attr_nr; + struct all_attrs_item *item = &check->all_attrs[n]; + if (item->macro) { + item->value = ATTR__UNSET; rem++; } } -- cgit v1.2.1