1 // SPDX-License-Identifier: GPL-2.0
5 * Helper functions for parsing config items.
6 * Originally copied from GIT source.
8 * Copyright (C) Linus Torvalds, 2005
9 * Copyright (C) Johannes Schindelin, 2005
13 #include <sys/param.h>
15 #include "callchain.h"
16 #include <subcmd/exec-cmd.h>
17 #include "util/event.h" /* proc_map_timeout */
18 #include "util/hist.h" /* perf_hist_config */
19 #include "util/llvm-utils.h" /* perf_llvm_config */
24 #include <sys/types.h>
28 #include <linux/string.h>
29 #include <linux/zalloc.h>
30 #include <linux/ctype.h>
34 #define DEBUG_CACHE_DIR ".debug"
37 char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
39 static FILE *config_file;
40 static const char *config_file_name;
41 static int config_linenr;
42 static int config_file_eof;
43 static struct perf_config_set *config_set;
45 const char *config_exclusive_filename;
47 static int get_next_char(void)
53 if ((f = config_file) != NULL) {
56 /* DOS like systems */
73 static char *parse_value(void)
75 static char value[1024];
76 int quote = 0, comment = 0, space = 0;
80 int c = get_next_char();
82 if (len >= sizeof(value) - 1)
92 if (isspace(c) && !quote) {
97 if (c == ';' || c == '#') {
121 /* Some characters escape as themselves */
124 /* Reject unknown escape sequences */
139 static inline int iskeychar(int c)
141 return isalnum(c) || c == '-' || c == '_';
144 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
149 /* Get the full name */
161 while (c == ' ' || c == '\t')
168 value = parse_value();
172 return fn(name, value, data);
175 static int get_extended_base_var(char *name, int baselen, int c)
181 } while (isspace(c));
183 /* We require the format to be '[base "extension"]' */
186 name[baselen++] = '.';
189 int ch = get_next_char();
196 ch = get_next_char();
200 name[baselen++] = ch;
201 if (baselen > MAXNAME / 2)
206 if (get_next_char() != ']')
211 static int get_base_var(char *name)
216 int c = get_next_char();
222 return get_extended_base_var(name, baselen, c);
223 if (!iskeychar(c) && c != '.')
225 if (baselen > MAXNAME / 2)
227 name[baselen++] = tolower(c);
231 static int perf_parse_file(config_fn_t fn, void *data)
235 static char var[MAXNAME];
237 /* U+FEFF Byte Order Mark in UTF8 */
238 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
239 const unsigned char *bomptr = utf8_bom;
242 int line, c = get_next_char();
244 if (bomptr && *bomptr) {
245 /* We are at the file beginning; skip UTF8-encoded BOM
246 * if present. Sane editors won't put this in on their
247 * own, but e.g. Windows Notepad will do it happily. */
248 if ((unsigned char) c == *bomptr) {
252 /* Do not tolerate partial BOM. */
253 if (bomptr != utf8_bom)
255 /* No BOM at file beginning. Cool. */
265 if (comment || isspace(c))
267 if (c == '#' || c == ';') {
272 baselen = get_base_var(var);
275 var[baselen++] = '.';
281 var[baselen] = tolower(c);
284 * The get_value function might or might not reach the '\n',
285 * so saving the current line number for error reporting.
287 line = config_linenr;
288 if (get_value(fn, data, var, baselen+1) < 0) {
289 config_linenr = line;
293 pr_err("bad config file line %d in %s\n", config_linenr, config_file_name);
297 static int parse_unit_factor(const char *end, unsigned long *val)
301 else if (!strcasecmp(end, "k")) {
305 else if (!strcasecmp(end, "m")) {
309 else if (!strcasecmp(end, "g")) {
310 *val *= 1024 * 1024 * 1024;
316 static int perf_parse_llong(const char *value, long long *ret)
318 if (value && *value) {
320 long long val = strtoll(value, &end, 0);
321 unsigned long factor = 1;
323 if (!parse_unit_factor(end, &factor))
331 static int perf_parse_long(const char *value, long *ret)
333 if (value && *value) {
335 long val = strtol(value, &end, 0);
336 unsigned long factor = 1;
337 if (!parse_unit_factor(end, &factor))
345 static void bad_config(const char *name)
347 if (config_file_name)
348 pr_warning("bad config value for '%s' in %s, ignoring...\n", name, config_file_name);
350 pr_warning("bad config value for '%s', ignoring...\n", name);
353 int perf_config_u64(u64 *dest, const char *name, const char *value)
357 if (!perf_parse_llong(value, &ret)) {
366 int perf_config_int(int *dest, const char *name, const char *value)
369 if (!perf_parse_long(value, &ret)) {
377 int perf_config_u8(u8 *dest, const char *name, const char *value)
381 if (!perf_parse_long(value, &ret)) {
389 static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
398 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
400 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
403 return perf_config_int(&ret, name, value) < 0 ? -1 : ret;
406 int perf_config_bool(const char *name, const char *value)
409 return !!perf_config_bool_or_int(name, value, &discard);
412 static const char *perf_config_dirname(const char *name, const char *value)
419 static int perf_buildid_config(const char *var, const char *value)
421 /* same dir for all commands */
422 if (!strcmp(var, "buildid.dir")) {
423 const char *dir = perf_config_dirname(var, value);
426 pr_err("Invalid buildid directory!\n");
429 strncpy(buildid_dir, dir, MAXPATHLEN-1);
430 buildid_dir[MAXPATHLEN-1] = '\0';
436 static int perf_default_core_config(const char *var __maybe_unused,
437 const char *value __maybe_unused)
439 if (!strcmp(var, "core.proc-map-timeout"))
440 proc_map_timeout = strtoul(value, NULL, 10);
442 /* Add other config variables here. */
446 static int perf_ui_config(const char *var, const char *value)
448 /* Add other config variables here. */
449 if (!strcmp(var, "ui.show-headers"))
450 symbol_conf.show_hist_headers = perf_config_bool(var, value);
455 int perf_default_config(const char *var, const char *value,
456 void *dummy __maybe_unused)
458 if (strstarts(var, "core."))
459 return perf_default_core_config(var, value);
461 if (strstarts(var, "hist."))
462 return perf_hist_config(var, value);
464 if (strstarts(var, "ui."))
465 return perf_ui_config(var, value);
467 if (strstarts(var, "call-graph."))
468 return perf_callchain_config(var, value);
470 if (strstarts(var, "llvm."))
471 return perf_llvm_config(var, value);
473 if (strstarts(var, "buildid."))
474 return perf_buildid_config(var, value);
476 /* Add other config variables here. */
480 static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
483 FILE *f = fopen(filename, "r");
488 config_file_name = filename;
491 ret = perf_parse_file(fn, data);
493 config_file_name = NULL;
498 const char *perf_etc_perfconfig(void)
500 static const char *system_wide;
502 system_wide = system_path(ETC_PERFCONFIG);
506 static int perf_env_bool(const char *k, int def)
508 const char *v = getenv(k);
509 return v ? perf_config_bool(k, v) : def;
512 static int perf_config_system(void)
514 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
517 static int perf_config_global(void)
519 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
522 static struct perf_config_section *find_section(struct list_head *sections,
523 const char *section_name)
525 struct perf_config_section *section;
527 list_for_each_entry(section, sections, node)
528 if (!strcmp(section->name, section_name))
534 static struct perf_config_item *find_config_item(const char *name,
535 struct perf_config_section *section)
537 struct perf_config_item *item;
539 list_for_each_entry(item, §ion->items, node)
540 if (!strcmp(item->name, name))
546 static struct perf_config_section *add_section(struct list_head *sections,
547 const char *section_name)
549 struct perf_config_section *section = zalloc(sizeof(*section));
554 INIT_LIST_HEAD(§ion->items);
555 section->name = strdup(section_name);
556 if (!section->name) {
557 pr_debug("%s: strdup failed\n", __func__);
562 list_add_tail(§ion->node, sections);
566 static struct perf_config_item *add_config_item(struct perf_config_section *section,
569 struct perf_config_item *item = zalloc(sizeof(*item));
574 item->name = strdup(name);
576 pr_debug("%s: strdup failed\n", __func__);
581 list_add_tail(&item->node, §ion->items);
585 static int set_value(struct perf_config_item *item, const char *value)
587 char *val = strdup(value);
597 static int collect_config(const char *var, const char *value,
598 void *perf_config_set)
602 char *section_name, *name;
603 struct perf_config_section *section = NULL;
604 struct perf_config_item *item = NULL;
605 struct perf_config_set *set = perf_config_set;
606 struct list_head *sections;
611 sections = &set->sections;
612 key = ptr = strdup(var);
614 pr_debug("%s: strdup failed\n", __func__);
618 section_name = strsep(&ptr, ".");
620 if (name == NULL || value == NULL)
623 section = find_section(sections, section_name);
625 section = add_section(sections, section_name);
630 item = find_config_item(name, section);
632 item = add_config_item(section, name);
637 /* perf_config_set can contain both user and system config items.
638 * So we should know where each value is from.
639 * The classification would be needed when a particular config file
640 * is overwrited by setting feature i.e. set_config().
642 if (strcmp(config_file_name, perf_etc_perfconfig()) == 0) {
643 section->from_system_config = true;
644 item->from_system_config = true;
646 section->from_system_config = false;
647 item->from_system_config = false;
650 ret = set_value(item, value);
657 int perf_config_set__collect(struct perf_config_set *set, const char *file_name,
658 const char *var, const char *value)
660 config_file_name = file_name;
661 return collect_config(var, value, set);
664 static int perf_config_set__init(struct perf_config_set *set)
667 const char *home = NULL;
671 /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
672 if (config_exclusive_filename)
673 return perf_config_from_file(collect_config, config_exclusive_filename, set);
674 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
675 if (perf_config_from_file(collect_config, perf_etc_perfconfig(), set) < 0)
679 home = getenv("HOME");
682 * Skip reading user config if:
683 * - there is no place to read it from (HOME)
684 * - we are asked not to (PERF_CONFIG_NOGLOBAL=1)
686 if (!home || !*home || !perf_config_global())
689 user_config = strdup(mkpath("%s/.perfconfig", home));
690 if (user_config == NULL) {
691 pr_warning("Not enough memory to process %s/.perfconfig, ignoring it.", home);
695 if (stat(user_config, &st) < 0) {
703 if (st.st_uid && (st.st_uid != geteuid())) {
704 pr_warning("File %s not owned by current user or root, ignoring it.", user_config);
709 ret = perf_config_from_file(collect_config, user_config, set);
717 struct perf_config_set *perf_config_set__new(void)
719 struct perf_config_set *set = zalloc(sizeof(*set));
722 INIT_LIST_HEAD(&set->sections);
723 perf_config_set__init(set);
729 static int perf_config__init(void)
731 if (config_set == NULL)
732 config_set = perf_config_set__new();
734 return config_set == NULL;
737 int perf_config(config_fn_t fn, void *data)
741 struct perf_config_section *section;
742 struct perf_config_item *item;
744 if (config_set == NULL && perf_config__init())
747 perf_config_set__for_each_entry(config_set, section, item) {
748 char *value = item->value;
751 scnprintf(key, sizeof(key), "%s.%s",
752 section->name, item->name);
753 ret = fn(key, value, data);
755 pr_err("Error: wrong config key-value pair %s=%s\n",
758 * Can't be just a 'break', as perf_config_set__for_each_entry()
759 * expands to two nested for() loops.
769 void perf_config__exit(void)
771 perf_config_set__delete(config_set);
775 void perf_config__refresh(void)
781 static void perf_config_item__delete(struct perf_config_item *item)
788 static void perf_config_section__purge(struct perf_config_section *section)
790 struct perf_config_item *item, *tmp;
792 list_for_each_entry_safe(item, tmp, §ion->items, node) {
793 list_del_init(&item->node);
794 perf_config_item__delete(item);
798 static void perf_config_section__delete(struct perf_config_section *section)
800 perf_config_section__purge(section);
801 zfree(§ion->name);
805 static void perf_config_set__purge(struct perf_config_set *set)
807 struct perf_config_section *section, *tmp;
809 list_for_each_entry_safe(section, tmp, &set->sections, node) {
810 list_del_init(§ion->node);
811 perf_config_section__delete(section);
815 void perf_config_set__delete(struct perf_config_set *set)
820 perf_config_set__purge(set);
825 * Call this to report error for your variable that should not
826 * get a boolean value (i.e. "[my] var" means "true").
828 int config_error_nonbool(const char *var)
830 pr_err("Missing value for '%s'", var);
834 void set_buildid_dir(const char *dir)
837 scnprintf(buildid_dir, MAXPATHLEN, "%s", dir);
839 /* default to $HOME/.debug */
840 if (buildid_dir[0] == '\0') {
841 char *home = getenv("HOME");
844 snprintf(buildid_dir, MAXPATHLEN, "%s/%s",
845 home, DEBUG_CACHE_DIR);
847 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
849 buildid_dir[MAXPATHLEN-1] = '\0';
851 /* for communicating with external commands */
852 setenv("PERF_BUILDID_DIR", buildid_dir, 1);