diff options
Diffstat (limited to 'attr.c')
| -rw-r--r-- | attr.c | 895 |
1 files changed, 624 insertions, 271 deletions
@@ -13,6 +13,8 @@ #include "attr.h" #include "dir.h" #include "utf8.h" +#include "quote.h" +#include "thread-utils.h" const char git_attr__true[] = "(builtin)true"; const char git_attr__false[] = "\0(builtin)false"; @@ -22,99 +24,234 @@ static const char git_attr__unknown[] = "(builtin)unknown"; #define ATTR__UNSET NULL #define ATTR__UNKNOWN git_attr__unknown -/* This is a randomly chosen prime. */ -#define HASHSIZE 257 - #ifndef DEBUG_ATTR #define DEBUG_ATTR 0 #endif struct git_attr { - struct git_attr *next; - unsigned h; - int attr_nr; - int maybe_macro; - int maybe_real; - char name[FLEX_ARRAY]; + int attr_nr; /* unique attribute number */ + char name[FLEX_ARRAY]; /* attribute name */ }; -static int attr_nr; -static int cannot_trust_maybe_real; - -static struct git_attr_check *check_all_attr; -static struct git_attr *(git_attr_hash[HASHSIZE]); -char *git_attr_name(struct git_attr *attr) +const char *git_attr_name(const struct git_attr *attr) { return attr->name; } -static unsigned hash_name(const char *name, int namelen) +struct attr_hashmap { + struct hashmap map; +#ifndef NO_PTHREADS + pthread_mutex_t mutex; +#endif +}; + +static inline void hashmap_lock(struct attr_hashmap *map) { - unsigned val = 0, c; +#ifndef NO_PTHREADS + pthread_mutex_lock(&map->mutex); +#endif +} - while (namelen--) { - c = *name++; - val = ((val << 7) | (val >> 22)) ^ c; +static inline void hashmap_unlock(struct attr_hashmap *map) +{ +#ifndef NO_PTHREADS + pthread_mutex_unlock(&map->mutex); +#endif +} + +/* + * The global dictionary of all interned attributes. This + * is a singleton object which is shared between threads. + * Access to this dictionary must be surrounded with a mutex. + */ +static struct attr_hashmap g_attr_hashmap; + +/* The container for objects stored in "struct attr_hashmap" */ +struct attr_hash_entry { + struct hashmap_entry ent; /* must be the first member! */ + const char *key; /* the key; memory should be owned by value */ + size_t keylen; /* length of the key */ + void *value; /* the stored value */ +}; + +/* attr_hashmap comparison function */ +static int attr_hash_entry_cmp(const struct attr_hash_entry *a, + const struct attr_hash_entry *b, + void *unused) +{ + return (a->keylen != b->keylen) || strncmp(a->key, b->key, a->keylen); +} + +/* Initialize an 'attr_hashmap' object */ +static void attr_hashmap_init(struct attr_hashmap *map) +{ + hashmap_init(&map->map, (hashmap_cmp_fn) attr_hash_entry_cmp, 0); +} + +/* + * Retrieve the 'value' stored in a hashmap given the provided 'key'. + * If there is no matching entry, return NULL. + */ +static void *attr_hashmap_get(struct attr_hashmap *map, + const char *key, size_t keylen) +{ + struct attr_hash_entry k; + struct attr_hash_entry *e; + + if (!map->map.tablesize) + attr_hashmap_init(map); + + hashmap_entry_init(&k, memhash(key, keylen)); + k.key = key; + k.keylen = keylen; + e = hashmap_get(&map->map, &k, NULL); + + return e ? e->value : NULL; +} + +/* Add 'value' to a hashmap based on the provided 'key'. */ +static void attr_hashmap_add(struct attr_hashmap *map, + const char *key, size_t keylen, + void *value) +{ + struct attr_hash_entry *e; + + if (!map->map.tablesize) + attr_hashmap_init(map); + + e = xmalloc(sizeof(struct attr_hash_entry)); + hashmap_entry_init(e, memhash(key, keylen)); + e->key = key; + e->keylen = keylen; + e->value = value; + + hashmap_add(&map->map, e); +} + +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; +}; + +/* + * Reallocate and reinitialize the array of all attributes (which is used in + * the attribute collection process) in 'check' based on the global dictionary + * of attributes. + */ +static void all_attrs_init(struct attr_hashmap *map, struct attr_check *check) +{ + int i; + + hashmap_lock(map); + + if (map->map.size < check->all_attrs_nr) + die("BUG: interned attributes shouldn't be deleted"); + + /* + * If the number of attributes in the global dictionary has increased + * (or this attr_check instance doesn't have an initialized all_attrs + * field), reallocate the provided attr_check instance's all_attrs + * field and fill each entry with its corresponding git_attr. + */ + if (map->map.size != check->all_attrs_nr) { + struct attr_hash_entry *e; + struct hashmap_iter iter; + hashmap_iter_init(&map->map, &iter); + + REALLOC_ARRAY(check->all_attrs, map->map.size); + check->all_attrs_nr = map->map.size; + + while ((e = hashmap_iter_next(&iter))) { + const struct git_attr *a = e->value; + check->all_attrs[a->attr_nr].attr = a; + } + } + + hashmap_unlock(map); + + /* + * Re-initialize every entry in check->all_attrs. + * This re-initialization can live outside of the locked region since + * the attribute dictionary is no longer being accessed. + */ + for (i = 0; i < check->all_attrs_nr; i++) { + check->all_attrs[i].value = ATTR__UNKNOWN; + check->all_attrs[i].macro = NULL; } - return val; } -static int invalid_attr_name(const char *name, int namelen) +static int attr_name_valid(const char *name, size_t namelen) { /* * Attribute name cannot begin with '-' and must consist of * characters from [-A-Za-z0-9_.]. */ if (namelen <= 0 || *name == '-') - return -1; + return 0; while (namelen--) { char ch = *name++; if (! (ch == '-' || ch == '.' || ch == '_' || ('0' <= ch && ch <= '9') || ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z')) ) - return -1; + return 0; } - return 0; + return 1; +} + +static void report_invalid_attr(const char *name, size_t len, + const char *src, int lineno) +{ + struct strbuf err = STRBUF_INIT; + strbuf_addf(&err, _("%.*s is not a valid attribute name"), + (int) len, name); + fprintf(stderr, "%s: %s:%d\n", err.buf, src, lineno); + strbuf_release(&err); } -static struct git_attr *git_attr_internal(const char *name, int len) +/* + * Given a 'name', lookup and return the corresponding attribute in the global + * dictionary. If no entry is found, create a new attribute and store it in + * the dictionary. + */ +static const struct git_attr *git_attr_internal(const char *name, int namelen) { - unsigned hval = hash_name(name, len); - unsigned pos = hval % HASHSIZE; struct git_attr *a; - for (a = git_attr_hash[pos]; a; a = a->next) { - if (a->h == hval && - !memcmp(a->name, name, len) && !a->name[len]) - return a; + if (!attr_name_valid(name, namelen)) + return NULL; + + hashmap_lock(&g_attr_hashmap); + + a = attr_hashmap_get(&g_attr_hashmap, name, namelen); + + if (!a) { + FLEX_ALLOC_MEM(a, name, name, namelen); + a->attr_nr = g_attr_hashmap.map.size; + + attr_hashmap_add(&g_attr_hashmap, a->name, namelen, a); + assert(a->attr_nr == (g_attr_hashmap.map.size - 1)); } - if (invalid_attr_name(name, len)) - return NULL; + hashmap_unlock(&g_attr_hashmap); - FLEX_ALLOC_MEM(a, name, name, len); - a->h = hval; - a->next = git_attr_hash[pos]; - a->attr_nr = attr_nr++; - a->maybe_macro = 0; - a->maybe_real = 0; - git_attr_hash[pos] = a; - - REALLOC_ARRAY(check_all_attr, attr_nr); - check_all_attr[a->attr_nr].attr = a; - check_all_attr[a->attr_nr].value = ATTR__UNKNOWN; return a; } -struct git_attr *git_attr(const char *name) +const struct git_attr *git_attr(const char *name) { return git_attr_internal(name, strlen(name)); } /* What does a matched pattern decide? */ struct attr_state { - struct git_attr *attr; + const struct git_attr *attr; const char *setto; }; @@ -131,9 +268,8 @@ struct pattern { * If is_macro is true, then u.attr is a pointer to the git_attr being * defined. * - * If is_macro is false, then u.pattern points at the filename pattern - * to which the rule applies. (The memory pointed to is part of the - * memory block allocated for the match_attr instance.) + * If is_macro is false, then u.pat is the filename pattern to which the + * rule applies. * * In either case, num_attr is the number of attributes affected by * this rule, and state is an array listing them. The attributes are @@ -142,7 +278,7 @@ struct pattern { struct match_attr { union { struct pattern pat; - struct git_attr *attr; + const struct git_attr *attr; } u; char is_macro; unsigned num_attr; @@ -177,13 +313,17 @@ static const char *parse_attr(const char *src, int lineno, const char *cp, cp++; len--; } - if (invalid_attr_name(cp, len)) { - fprintf(stderr, - "%.*s is not a valid attribute name: %s:%d\n", - len, cp, src, lineno); + if (!attr_name_valid(cp, len)) { + report_invalid_attr(cp, len, src, lineno); return NULL; } } else { + /* + * As this function is always called twice, once with + * e == NULL in the first pass and then e != NULL in + * the second pass, no need for attr_name_valid() + * check here. + */ if (*cp == '-' || *cp == '!') { e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET; cp++; @@ -207,41 +347,47 @@ static struct match_attr *parse_attr_line(const char *line, const char *src, const char *cp, *name, *states; struct match_attr *res = NULL; int is_macro; + struct strbuf pattern = STRBUF_INIT; cp = line + strspn(line, blank); if (!*cp || *cp == '#') return NULL; name = cp; - namelen = strcspn(name, blank); + + if (*cp == '"' && !unquote_c_style(&pattern, name, &states)) { + name = pattern.buf; + namelen = pattern.len; + } else { + namelen = strcspn(name, blank); + states = name + namelen; + } + if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen && starts_with(name, ATTRIBUTE_MACRO_PREFIX)) { if (!macro_ok) { fprintf(stderr, "%s not allowed: %s:%d\n", name, src, lineno); - return NULL; + goto fail_return; } is_macro = 1; name += strlen(ATTRIBUTE_MACRO_PREFIX); name += strspn(name, blank); namelen = strcspn(name, blank); - if (invalid_attr_name(name, namelen)) { - fprintf(stderr, - "%.*s is not a valid attribute name: %s:%d\n", - namelen, name, src, lineno); - return NULL; + if (!attr_name_valid(name, namelen)) { + report_invalid_attr(name, namelen, src, lineno); + goto fail_return; } } else is_macro = 0; - states = name + namelen; states += strspn(states, blank); /* First pass to count the attr_states */ for (cp = states, num_attr = 0; *cp; num_attr++) { cp = parse_attr(src, lineno, cp, NULL); if (!cp) - return NULL; + goto fail_return; } res = xcalloc(1, @@ -250,7 +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); @@ -262,7 +407,7 @@ static struct match_attr *parse_attr_line(const char *line, const char *src, if (res->u.pat.flags & EXC_FLAG_NEGATIVE) { warning(_("Negative patterns are ignored in git attributes\n" "Use '\\!' for literal leading exclamation.")); - return NULL; + goto fail_return; } } res->is_macro = is_macro; @@ -271,13 +416,15 @@ 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); return res; + +fail_return: + strbuf_release(&pattern); + free(res); + return NULL; } /* @@ -295,19 +442,19 @@ static struct match_attr *parse_attr_line(const char *line, const char *src, * directory (again, reading the file from top to bottom) down to the * current directory, and then scan the list backwards to find the first match. * This is exactly the same as what is_excluded() does in dir.c to deal with - * .gitignore + * .gitignore file and info/excludes file as a fallback. */ -static struct attr_stack { +struct attr_stack { struct attr_stack *prev; char *origin; size_t originlen; unsigned num_matches; unsigned alloc; struct match_attr **attrs; -} *attr_stack; +}; -static void free_attr_elem(struct attr_stack *e) +static void attr_stack_free(struct attr_stack *e) { int i; free(e->origin); @@ -330,6 +477,190 @@ static void free_attr_elem(struct attr_stack *e) free(e); } +static void drop_attr_stack(struct attr_stack **stack) +{ + while (*stack) { + struct attr_stack *elem = *stack; + *stack = elem->prev; + attr_stack_free(elem); + } +} + +/* List of all attr_check structs; access should be surrounded by mutex */ +static struct check_vector { + size_t nr; + size_t alloc; + struct attr_check **checks; +#ifndef NO_PTHREADS + pthread_mutex_t mutex; +#endif +} check_vector; + +static inline void vector_lock(void) +{ +#ifndef NO_PTHREADS + pthread_mutex_lock(&check_vector.mutex); +#endif +} + +static inline void vector_unlock(void) +{ +#ifndef NO_PTHREADS + pthread_mutex_unlock(&check_vector.mutex); +#endif +} + +static void check_vector_add(struct attr_check *c) +{ + vector_lock(); + + ALLOC_GROW(check_vector.checks, + check_vector.nr + 1, + check_vector.alloc); + check_vector.checks[check_vector.nr++] = c; + + vector_unlock(); +} + +static void check_vector_remove(struct attr_check *check) +{ + int i; + + vector_lock(); + + /* Find entry */ + for (i = 0; i < check_vector.nr; i++) + if (check_vector.checks[i] == check) + break; + + if (i >= check_vector.nr) + die("BUG: no entry found"); + + /* shift entries over */ + for (; i < check_vector.nr - 1; i++) + check_vector.checks[i] = check_vector.checks[i + 1]; + + check_vector.nr--; + + vector_unlock(); +} + +/* Iterate through all attr_check instances and drop their stacks */ +static void drop_all_attr_stacks(void) +{ + int i; + + vector_lock(); + + for (i = 0; i < check_vector.nr; i++) { + drop_attr_stack(&check_vector.checks[i]->stack); + } + + vector_unlock(); +} + +struct attr_check *attr_check_alloc(void) +{ + struct attr_check *c = xcalloc(1, sizeof(struct attr_check)); + + /* save pointer to the check struct */ + check_vector_add(c); + + return c; +} + +struct attr_check *attr_check_initl(const char *one, ...) +{ + struct attr_check *check; + int cnt; + va_list params; + const char *param; + + va_start(params, one); + for (cnt = 1; (param = va_arg(params, const char *)) != NULL; cnt++) + ; + va_end(params); + + check = attr_check_alloc(); + check->nr = cnt; + check->alloc = cnt; + check->items = xcalloc(cnt, sizeof(struct attr_check_item)); + + check->items[0].attr = git_attr(one); + va_start(params, one); + for (cnt = 1; cnt < check->nr; cnt++) { + const struct git_attr *attr; + param = va_arg(params, const char *); + if (!param) + die("BUG: counted %d != ended at %d", + check->nr, cnt); + attr = git_attr(param); + if (!attr) + die("BUG: %s: not a valid attribute name", param); + check->items[cnt].attr = attr; + } + va_end(params); + return check; +} + +struct attr_check *attr_check_dup(const struct attr_check *check) +{ + struct attr_check *ret; + + if (!check) + return NULL; + + ret = attr_check_alloc(); + + ret->nr = check->nr; + ret->alloc = check->alloc; + ALLOC_ARRAY(ret->items, ret->nr); + COPY_ARRAY(ret->items, check->items, ret->nr); + + return ret; +} + +struct attr_check_item *attr_check_append(struct attr_check *check, + const struct git_attr *attr) +{ + struct attr_check_item *item; + + ALLOC_GROW(check->items, check->nr + 1, check->alloc); + item = &check->items[check->nr++]; + item->attr = attr; + return item; +} + +void attr_check_reset(struct attr_check *check) +{ + check->nr = 0; +} + +void attr_check_clear(struct attr_check *check) +{ + free(check->items); + check->items = NULL; + check->alloc = 0; + check->nr = 0; + + free(check->all_attrs); + check->all_attrs = NULL; + check->all_attrs_nr = 0; + + drop_attr_stack(&check->stack); +} + +void attr_check_free(struct attr_check *check) +{ + if (check) { + /* Remove check from the check vector */ + check_vector_remove(check); + + attr_check_clear(check); + free(check); + } +} + static const char *builtin_attr[] = { "[attr]binary -diff -merge -text", NULL, @@ -362,9 +693,31 @@ static struct attr_stack *read_attr_from_array(const char **list) return res; } +/* + * Callers into the attribute system assume there is a single, system-wide + * global state where attributes are read from and when the state is flipped by + * calling git_attr_set_direction(), the stack frames that have been + * constructed need to be discarded so so that subsequent calls into the + * attribute system will lazily read from the right place. Since changing + * direction causes a global paradigm shift, it should not ever be called while + * another thread could potentially be calling into the attribute system. + */ static enum git_attr_direction direction; static struct index_state *use_index; +void git_attr_set_direction(enum git_attr_direction new_direction, + struct index_state *istate) +{ + if (is_bare_repository() && new_direction != GIT_ATTR_INDEX) + die("BUG: non-INDEX attr direction in a bare repo"); + + if (new_direction != direction) + drop_all_attr_stacks(); + + direction = new_direction; + use_index = istate; +} + static struct attr_stack *read_attr_from_file(const char *path, int macro_ok) { FILE *fp = fopen(path, "r"); @@ -402,8 +755,8 @@ static struct attr_stack *read_attr_from_index(const char *path, int macro_ok) for (sp = buf; *sp; ) { char *ep; int more; - for (ep = sp; *ep && *ep != '\n'; ep++) - ; + + ep = strchrnul(sp, '\n'); more = (*ep == '\n'); *ep = '\0'; handle_attr_line(res, sp, path, ++lineno, macro_ok); @@ -415,25 +768,28 @@ static struct attr_stack *read_attr_from_index(const char *path, int macro_ok) static struct attr_stack *read_attr(const char *path, int macro_ok) { - struct attr_stack *res; + struct attr_stack *res = NULL; - if (direction == GIT_ATTR_CHECKOUT) { + if (direction == GIT_ATTR_INDEX) { res = read_attr_from_index(path, macro_ok); - if (!res) - res = read_attr_from_file(path, macro_ok); - } - else if (direction == GIT_ATTR_CHECKIN) { - res = read_attr_from_file(path, macro_ok); - if (!res) - /* - * There is no checked out .gitattributes file there, but - * we might have it in the index. We allow operation in a - * sparsely checked out work tree, so read from it. - */ + } else if (!is_bare_repository()) { + if (direction == GIT_ATTR_CHECKOUT) { res = read_attr_from_index(path, macro_ok); + if (!res) + res = read_attr_from_file(path, macro_ok); + } else if (direction == GIT_ATTR_CHECKIN) { + res = read_attr_from_file(path, macro_ok); + if (!res) + /* + * There is no checked out .gitattributes file + * there, but we might have it in the index. + * We allow operation in a sparsely checked out + * work tree, so read from it. + */ + res = read_attr_from_index(path, macro_ok); + } } - else - res = read_attr_from_index(path, macro_ok); + if (!res) res = xcalloc(1, sizeof(*res)); return res; @@ -464,16 +820,7 @@ static void debug_set(const char *what, const char *match, struct git_attr *attr #define debug_push(a) do { ; } while (0) #define debug_pop(a) do { ; } while (0) #define debug_set(a,b,c,d) do { ; } while (0) -#endif - -static void drop_attr_stack(void) -{ - while (attr_stack) { - struct attr_stack *elem = attr_stack; - attr_stack = elem->prev; - free_attr_elem(elem); - } -} +#endif /* DEBUG_ATTR */ static const char *git_etc_gitattributes(void) { @@ -483,6 +830,14 @@ static const char *git_etc_gitattributes(void) return system_wide; } +static const char *get_home_gitattributes(void) +{ + if (!git_attributes_file) + git_attributes_file = xdg_config_home("attributes"); + + return git_attributes_file; +} + static int git_attr_system(void) { return !git_env_bool("GIT_ATTR_NOSYSTEM", 0); @@ -490,60 +845,60 @@ static int git_attr_system(void) static GIT_PATH_FUNC(git_path_info_attributes, INFOATTRIBUTES_FILE) -static void bootstrap_attr_stack(void) +static void push_stack(struct attr_stack **attr_stack_p, + struct attr_stack *elem, char *origin, size_t originlen) { - struct attr_stack *elem; + if (elem) { + elem->origin = origin; + if (origin) + elem->originlen = originlen; + elem->prev = *attr_stack_p; + *attr_stack_p = elem; + } +} - if (attr_stack) +static void bootstrap_attr_stack(struct attr_stack **stack) +{ + struct attr_stack *e; + + if (*stack) return; - elem = read_attr_from_array(builtin_attr); - elem->origin = NULL; - elem->prev = attr_stack; - attr_stack = elem; + /* builtin frame */ + e = read_attr_from_array(builtin_attr); + push_stack(stack, e, NULL, 0); + /* system-wide frame */ if (git_attr_system()) { - elem = read_attr_from_file(git_etc_gitattributes(), 1); - if (elem) { - elem->origin = NULL; - elem->prev = attr_stack; - attr_stack = elem; - } + e = read_attr_from_file(git_etc_gitattributes(), 1); + push_stack(stack, e, NULL, 0); } - if (!git_attributes_file) - git_attributes_file = xdg_config_home("attributes"); - if (git_attributes_file) { - elem = read_attr_from_file(git_attributes_file, 1); - if (elem) { - elem->origin = NULL; - elem->prev = attr_stack; - attr_stack = elem; - } + /* home directory */ + if (get_home_gitattributes()) { + e = read_attr_from_file(get_home_gitattributes(), 1); + push_stack(stack, e, NULL, 0); } - if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { - elem = read_attr(GITATTRIBUTES_FILE, 1); - elem->origin = xstrdup(""); - elem->originlen = 0; - elem->prev = attr_stack; - attr_stack = elem; - debug_push(elem); - } + /* root directory */ + e = read_attr(GITATTRIBUTES_FILE, 1); + push_stack(stack, e, xstrdup(""), 0); - elem = read_attr_from_file(git_path_info_attributes(), 1); - if (!elem) - elem = xcalloc(1, sizeof(*elem)); - elem->origin = NULL; - elem->prev = attr_stack; - attr_stack = elem; + /* info frame */ + if (startup_info->have_repository) + e = read_attr_from_file(git_path_info_attributes(), 1); + else + e = NULL; + if (!e) + e = xcalloc(1, sizeof(struct attr_stack)); + push_stack(stack, e, NULL, 0); } -static void prepare_attr_stack(const char *path, int dirlen) +static void prepare_attr_stack(const char *path, int dirlen, + struct attr_stack **stack) { - struct attr_stack *elem, *info; - int len; - const char *cp; + struct attr_stack *info; + struct strbuf pathbuf = STRBUF_INIT; /* * At the bottom of the attribute stack is the built-in @@ -560,13 +915,13 @@ static void prepare_attr_stack(const char *path, int dirlen) * .gitattributes in deeper directories to shallower ones, * and finally use the built-in set as the default. */ - bootstrap_attr_stack(); + bootstrap_attr_stack(stack); /* * Pop the "info" one that is always at the top of the stack. */ - info = attr_stack; - attr_stack = info->prev; + info = *stack; + *stack = info->prev; /* * Pop the ones from directories that are not the prefix of @@ -574,59 +929,63 @@ static void prepare_attr_stack(const char *path, int dirlen) * the root one (whose origin is an empty string "") or the builtin * one (whose origin is NULL) without popping it. */ - while (attr_stack->origin) { - int namelen = strlen(attr_stack->origin); + while ((*stack)->origin) { + int namelen = (*stack)->originlen; + struct attr_stack *elem; - elem = attr_stack; + elem = *stack; if (namelen <= dirlen && !strncmp(elem->origin, path, namelen) && (!namelen || path[namelen] == '/')) break; debug_pop(elem); - attr_stack = elem->prev; - free_attr_elem(elem); + *stack = elem->prev; + attr_stack_free(elem); } /* - * Read from parent directories and push them down + * bootstrap_attr_stack() should have added, and the + * above loop should have stopped before popping, the + * root element whose attr_stack->origin is set to an + * empty string. */ - if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { - /* - * bootstrap_attr_stack() should have added, and the - * above loop should have stopped before popping, the - * root element whose attr_stack->origin is set to an - * empty string. - */ - struct strbuf pathbuf = STRBUF_INIT; - - assert(attr_stack->origin); - while (1) { - len = strlen(attr_stack->origin); - if (dirlen <= len) - break; - cp = memchr(path + len + 1, '/', dirlen - len - 1); - if (!cp) - cp = path + dirlen; - strbuf_add(&pathbuf, path, cp - path); + assert((*stack)->origin); + + strbuf_addstr(&pathbuf, (*stack)->origin); + /* Build up to the directory 'path' is in */ + while (pathbuf.len < dirlen) { + size_t len = pathbuf.len; + struct attr_stack *next; + char *origin; + + /* Skip path-separator */ + if (len < dirlen && is_dir_sep(path[len])) + len++; + /* Find the end of the next component */ + while (len < dirlen && !is_dir_sep(path[len])) + len++; + + if (pathbuf.len > 0) strbuf_addch(&pathbuf, '/'); - strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE); - elem = read_attr(pathbuf.buf, 0); - strbuf_setlen(&pathbuf, cp - path); - elem->origin = strbuf_detach(&pathbuf, &elem->originlen); - elem->prev = attr_stack; - attr_stack = elem; - debug_push(elem); - } + strbuf_add(&pathbuf, path + pathbuf.len, (len - pathbuf.len)); + strbuf_addf(&pathbuf, "/%s", GITATTRIBUTES_FILE); + + next = read_attr(pathbuf.buf, 0); + + /* reset the pathbuf to not include "/.gitattributes" */ + strbuf_setlen(&pathbuf, len); - strbuf_release(&pathbuf); + origin = xstrdup(pathbuf.buf); + push_stack(stack, next, origin, len); } /* * Finally push the "info" one at the top of the stack. */ - info->prev = attr_stack; - attr_stack = info; + push_stack(stack, info, NULL, 0); + + strbuf_release(&pathbuf); } static int path_matches(const char *pathname, int pathlen, @@ -652,16 +1011,16 @@ static int path_matches(const char *pathname, int pathlen, pattern, prefix, pat->patternlen, pat->flags); } -static int macroexpand_one(int attr_nr, int rem); +static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem); -static int fill_one(const char *what, struct match_attr *a, int rem) +static int fill_one(const char *what, struct all_attrs_item *all_attrs, + const struct match_attr *a, int rem) { - struct git_attr_check *check = check_all_attr; int i; - for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) { - struct git_attr *attr = a->state[i].attr; - const char **n = &(check[attr->attr_nr].value); + for (i = a->num_attr - 1; rem > 0 && i >= 0; i--) { + const struct git_attr *attr = a->state[i].attr; + const char **n = &(all_attrs[attr->attr_nr].value); const char *v = a->state[i].setto; if (*n == ATTR__UNKNOWN) { @@ -670,64 +1029,72 @@ static int fill_one(const char *what, struct match_attr *a, int rem) attr, v); *n = v; rem--; - rem = macroexpand_one(attr->attr_nr, rem); + rem = macroexpand_one(all_attrs, attr->attr_nr, rem); } } return rem; } static int fill(const char *path, int pathlen, int basename_offset, - struct attr_stack *stk, int rem) + const struct attr_stack *stack, + struct all_attrs_item *all_attrs, int rem) { - int i; - const char *base = stk->origin ? stk->origin : ""; + for (; rem > 0 && stack; stack = stack->prev) { + int i; + const char *base = stack->origin ? stack->origin : ""; - for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) { - struct match_attr *a = stk->attrs[i]; - if (a->is_macro) - continue; - if (path_matches(path, pathlen, basename_offset, - &a->u.pat, base, stk->originlen)) - rem = fill_one("fill", a, rem); + for (i = stack->num_matches - 1; 0 < rem && 0 <= i; i--) { + const struct match_attr *a = stack->attrs[i]; + if (a->is_macro) + continue; + if (path_matches(path, pathlen, basename_offset, + &a->u.pat, base, stack->originlen)) + rem = fill_one("fill", all_attrs, a, rem); + } } + return rem; } -static int macroexpand_one(int nr, int rem) +static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem) { - struct attr_stack *stk; - struct match_attr *a = NULL; - int i; + const struct all_attrs_item *item = &all_attrs[nr]; - if (check_all_attr[nr].value != ATTR__TRUE || - !check_all_attr[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; !a && stk; stk = stk->prev) - for (i = stk->num_matches - 1; !a && 0 <= i; i--) { - struct match_attr *ma = stk->attrs[i]; - if (!ma->is_macro) - continue; - if (ma->u.attr->attr_nr == nr) - a = ma; +/* + * 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; + } + } } - - if (a) - rem = fill_one("expand", a, rem); - - return rem; + } } /* - * Collect attributes for path into the array pointed to by - * check_all_attr. If num is non-zero, only attributes in check[] are - * collected. Otherwise all attributes are collected. + * Collect attributes for path into the array pointed to by check->all_attrs. + * If check->check_nr is non-zero, only attributes in check[] are collected. + * Otherwise all attributes are collected. */ -static void collect_some_attrs(const char *path, int num, - struct git_attr_check *check) - +static void collect_some_attrs(const char *path, struct attr_check *check) { - struct attr_stack *stk; int i, pathlen, rem, dirlen; const char *cp, *last_slash = NULL; int basename_offset; @@ -745,81 +1112,67 @@ static void collect_some_attrs(const char *path, int num, dirlen = 0; } - prepare_attr_stack(path, dirlen); - for (i = 0; i < attr_nr; i++) - check_all_attr[i].value = ATTR__UNKNOWN; - if (num && !cannot_trust_maybe_real) { + prepare_attr_stack(path, dirlen, &check->stack); + all_attrs_init(&g_attr_hashmap, check); + determine_macros(check->all_attrs, check->stack); + + if (check->nr) { rem = 0; - for (i = 0; i < num; i++) { - if (!check[i].attr->maybe_real) { - struct git_attr_check *c; - c = check_all_attr + check[i].attr->attr_nr; - c->value = ATTR__UNSET; + for (i = 0; i < check->nr; i++) { + 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++; } } - if (rem == num) + if (rem == check->nr) return; } - rem = attr_nr; - for (stk = attr_stack; 0 < rem && stk; stk = stk->prev) - rem = fill(path, pathlen, basename_offset, stk, rem); + rem = check->all_attrs_nr; + fill(path, pathlen, basename_offset, check->stack, check->all_attrs, rem); } -int git_check_attr(const char *path, int num, struct git_attr_check *check) +int git_check_attr(const char *path, struct attr_check *check) { int i; - collect_some_attrs(path, num, check); + collect_some_attrs(path, check); - for (i = 0; i < num; i++) { - const char *value = check_all_attr[check[i].attr->attr_nr].value; + for (i = 0; i < check->nr; i++) { + size_t n = check->items[i].attr->attr_nr; + const char *value = check->all_attrs[n].value; if (value == ATTR__UNKNOWN) value = ATTR__UNSET; - check[i].value = value; + check->items[i].value = value; } return 0; } -int git_all_attrs(const char *path, int *num, struct git_attr_check **check) +void git_all_attrs(const char *path, struct attr_check *check) { - int i, count, j; + int i; - collect_some_attrs(path, 0, NULL); + attr_check_reset(check); + collect_some_attrs(path, check); - /* Count the number of attributes that are set. */ - count = 0; - for (i = 0; i < attr_nr; i++) { - const char *value = check_all_attr[i].value; - if (value != ATTR__UNSET && value != ATTR__UNKNOWN) - ++count; - } - *num = count; - ALLOC_ARRAY(*check, count); - j = 0; - for (i = 0; i < attr_nr; i++) { - const char *value = check_all_attr[i].value; - if (value != ATTR__UNSET && value != ATTR__UNKNOWN) { - (*check)[j].attr = check_all_attr[i].attr; - (*check)[j].value = value; - ++j; - } + for (i = 0; i < check->all_attrs_nr; i++) { + const char *name = check->all_attrs[i].attr->name; + const char *value = check->all_attrs[i].value; + struct attr_check_item *item; + if (value == ATTR__UNSET || value == ATTR__UNKNOWN) + continue; + item = attr_check_append(check, git_attr(name)); + item->value = value; } - - return 0; } -void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate) +void attr_start(void) { - enum git_attr_direction old = direction; - - if (is_bare_repository() && new != GIT_ATTR_INDEX) - die("BUG: non-INDEX attr direction in a bare repo"); - - direction = new; - if (new != old) - drop_attr_stack(); - use_index = istate; +#ifndef NO_PTHREADS + pthread_mutex_init(&g_attr_hashmap.mutex, NULL); + pthread_mutex_init(&check_vector.mutex, NULL); +#endif } |