// SPDX-License-Identifier: GPL-2.0
#include <linux/hw_breakpoint.h>
#include <linux/err.h>
#include <linux/zalloc.h>
#include <dirent.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/param.h>
#include "term.h"
#include "build-id.h"
#include "evlist.h"
#include "evsel.h"
#include <subcmd/pager.h>
#include <subcmd/parse-options.h>
#include "parse-events.h"
#include <subcmd/exec-cmd.h>
#include "string2.h"
#include "strlist.h"
#include "symbol.h"
#include "header.h"
#include "bpf-loader.h"
#include "debug.h"
#include <api/fs/tracing_path.h>
#include <perf/cpumap.h>
#include "parse-events-bison.h"
#define YY_EXTRA_TYPE void*
#include "parse-events-flex.h"
#include "pmu.h"
#include "thread_map.h"
#include "probe-file.h"
#include "asm/bug.h"
#include "util/parse-branch-options.h"
#include "metricgroup.h"
#include "util/evsel_config.h"
#include "util/event.h"
#include "util/pfm.h"
#include "perf.h"

#define MAX_NAME_LEN 100

#ifdef PARSER_DEBUG
extern int parse_events_debug;
#endif
int parse_events_parse(void *parse_state, void *scanner);
static int get_config_terms(struct list_head *head_config,
                            struct list_head *head_terms __maybe_unused);

static struct perf_pmu_event_symbol *perf_pmu_events_list;
/*
 * The variable indicates the number of supported pmu event symbols.
 * 0 means not initialized and ready to init
 * -1 means failed to init, don't try anymore
 * >0 is the number of supported pmu event symbols
 */
static int perf_pmu_events_list_num;

struct event_symbol event_symbols_hw[PERF_COUNT_HW_MAX] = {
        [PERF_COUNT_HW_CPU_CYCLES] = {
                .symbol = "cpu-cycles",
                .alias  = "cycles",
        },
        [PERF_COUNT_HW_INSTRUCTIONS] = {
                .symbol = "instructions",
                .alias  = "",
        },
        [PERF_COUNT_HW_CACHE_REFERENCES] = {
                .symbol = "cache-references",
                .alias  = "",
        },
        [PERF_COUNT_HW_CACHE_MISSES] = {
                .symbol = "cache-misses",
                .alias  = "",
        },
        [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = {
                .symbol = "branch-instructions",
                .alias  = "branches",
        },
        [PERF_COUNT_HW_BRANCH_MISSES] = {
                .symbol = "branch-misses",
                .alias  = "",
        },
        [PERF_COUNT_HW_BUS_CYCLES] = {
                .symbol = "bus-cycles",
                .alias  = "",
        },
        [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = {
                .symbol = "stalled-cycles-frontend",
                .alias  = "idle-cycles-frontend",
        },
        [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = {
                .symbol = "stalled-cycles-backend",
                .alias  = "idle-cycles-backend",
        },
        [PERF_COUNT_HW_REF_CPU_CYCLES] = {
                .symbol = "ref-cycles",
                .alias  = "",
        },
};

struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = {
        [PERF_COUNT_SW_CPU_CLOCK] = {
                .symbol = "cpu-clock",
                .alias  = "",
        },
        [PERF_COUNT_SW_TASK_CLOCK] = {
                .symbol = "task-clock",
                .alias  = "",
        },
        [PERF_COUNT_SW_PAGE_FAULTS] = {
                .symbol = "page-faults",
                .alias  = "faults",
        },
        [PERF_COUNT_SW_CONTEXT_SWITCHES] = {
                .symbol = "context-switches",
                .alias  = "cs",
        },
        [PERF_COUNT_SW_CPU_MIGRATIONS] = {
                .symbol = "cpu-migrations",
                .alias  = "migrations",
        },
        [PERF_COUNT_SW_PAGE_FAULTS_MIN] = {
                .symbol = "minor-faults",
                .alias  = "",
        },
        [PERF_COUNT_SW_PAGE_FAULTS_MAJ] = {
                .symbol = "major-faults",
                .alias  = "",
        },
        [PERF_COUNT_SW_ALIGNMENT_FAULTS] = {
                .symbol = "alignment-faults",
                .alias  = "",
        },
        [PERF_COUNT_SW_EMULATION_FAULTS] = {
                .symbol = "emulation-faults",
                .alias  = "",
        },
        [PERF_COUNT_SW_DUMMY] = {
                .symbol = "dummy",
                .alias  = "",
        },
        [PERF_COUNT_SW_BPF_OUTPUT] = {
                .symbol = "bpf-output",
                .alias  = "",
        },
};

#define __PERF_EVENT_FIELD(config, name) \
        ((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)

#define PERF_EVENT_RAW(config)          __PERF_EVENT_FIELD(config, RAW)
#define PERF_EVENT_CONFIG(config)       __PERF_EVENT_FIELD(config, CONFIG)
#define PERF_EVENT_TYPE(config)         __PERF_EVENT_FIELD(config, TYPE)
#define PERF_EVENT_ID(config)           __PERF_EVENT_FIELD(config, EVENT)

#define for_each_subsystem(sys_dir, sys_dirent)                 \
        while ((sys_dirent = readdir(sys_dir)) != NULL)         \
                if (sys_dirent->d_type == DT_DIR &&             \
                    (strcmp(sys_dirent->d_name, ".")) &&        \
                    (strcmp(sys_dirent->d_name, "..")))

static int tp_event_has_id(const char *dir_path, struct dirent *evt_dir)
{
        char evt_path[MAXPATHLEN];
        int fd;

        snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, evt_dir->d_name);
        fd = open(evt_path, O_RDONLY);
        if (fd < 0)
                return -EINVAL;
        close(fd);

        return 0;
}

#define for_each_event(dir_path, evt_dir, evt_dirent)           \
        while ((evt_dirent = readdir(evt_dir)) != NULL)         \
                if (evt_dirent->d_type == DT_DIR &&             \
                    (strcmp(evt_dirent->d_name, ".")) &&        \
                    (strcmp(evt_dirent->d_name, "..")) &&       \
                    (!tp_event_has_id(dir_path, evt_dirent)))

#define MAX_EVENT_LENGTH 512

void parse_events__handle_error(struct parse_events_error *err, int idx,
                                char *str, char *help)
{
        if (WARN(!str, "WARNING: failed to provide error string\n")) {
                free(help);
                return;
        }
        switch (err->num_errors) {
        case 0:
                err->idx = idx;
                err->str = str;
                err->help = help;
                break;
        case 1:
                err->first_idx = err->idx;
                err->idx = idx;
                err->first_str = err->str;
                err->str = str;
                err->first_help = err->help;
                err->help = help;
                break;
        default:
                pr_debug("Multiple errors dropping message: %s (%s)\n",
                        err->str, err->help);
                free(err->str);
                err->str = str;
                free(err->help);
                err->help = help;
                break;
        }
        err->num_errors++;
}

struct tracepoint_path *tracepoint_id_to_path(u64 config)
{
        struct tracepoint_path *path = NULL;
        DIR *sys_dir, *evt_dir;
        struct dirent *sys_dirent, *evt_dirent;
        char id_buf[24];
        int fd;
        u64 id;
        char evt_path[MAXPATHLEN];
        char *dir_path;

        sys_dir = tracing_events__opendir();
        if (!sys_dir)
                return NULL;

        for_each_subsystem(sys_dir, sys_dirent) {
                dir_path = get_events_file(sys_dirent->d_name);
                if (!dir_path)
                        continue;
                evt_dir = opendir(dir_path);
                if (!evt_dir)
                        goto next;

                for_each_event(dir_path, evt_dir, evt_dirent) {

                        scnprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
                                  evt_dirent->d_name);
                        fd = open(evt_path, O_RDONLY);
                        if (fd < 0)
                                continue;
                        if (read(fd, id_buf, sizeof(id_buf)) < 0) {
                                close(fd);
                                continue;
                        }
                        close(fd);
                        id = atoll(id_buf);
                        if (id == config) {
                                put_events_file(dir_path);
                                closedir(evt_dir);
                                closedir(sys_dir);
                                path = zalloc(sizeof(*path));
                                if (!path)
                                        return NULL;
                                if (asprintf(&path->system, "%.*s", MAX_EVENT_LENGTH, sys_dirent->d_name) < 0) {
                                        free(path);
                                        return NULL;
                                }
                                if (asprintf(&path->name, "%.*s", MAX_EVENT_LENGTH, evt_dirent->d_name) < 0) {
                                        zfree(&path->system);
                                        free(path);
                                        return NULL;
                                }
                                return path;
                        }
                }
                closedir(evt_dir);
next:
                put_events_file(dir_path);
        }

        closedir(sys_dir);
        return NULL;
}

struct tracepoint_path *tracepoint_name_to_path(const char *name)
{
        struct tracepoint_path *path = zalloc(sizeof(*path));
        char *str = strchr(name, ':');

        if (path == NULL || str == NULL) {
                free(path);
                return NULL;
        }

        path->system = strndup(name, str - name);
        path->name = strdup(str+1);

        if (path->system == NULL || path->name == NULL) {
                zfree(&path->system);
                zfree(&path->name);
                zfree(&path);
        }

        return path;
}

const char *event_type(int type)
{
        switch (type) {
        case PERF_TYPE_HARDWARE:
                return "hardware";

        case PERF_TYPE_SOFTWARE:
                return "software";

        case PERF_TYPE_TRACEPOINT:
                return "tracepoint";

        case PERF_TYPE_HW_CACHE:
                return "hardware-cache";

        default:
                break;
        }

        return "unknown";
}

static int parse_events__is_name_term(struct parse_events_term *term)
{
        return term->type_term == PARSE_EVENTS__TERM_TYPE_NAME;
}

static char *get_config_name(struct list_head *head_terms)
{
        struct parse_events_term *term;

        if (!head_terms)
                return NULL;

        list_for_each_entry(term, head_terms, list)
                if (parse_events__is_name_term(term))
                        return term->val.str;

        return NULL;
}

static struct evsel *
__add_event(struct list_head *list, int *idx,
            struct perf_event_attr *attr,
            bool init_attr,
            char *name, struct perf_pmu *pmu,
            struct list_head *config_terms, bool auto_merge_stats,
            const char *cpu_list)
{
        struct evsel *evsel;
        struct perf_cpu_map *cpus = pmu ? perf_cpu_map__get(pmu->cpus) :
                               cpu_list ? perf_cpu_map__new(cpu_list) : NULL;

        if (init_attr)
                event_attr_init(attr);

        evsel = evsel__new_idx(attr, *idx);
        if (!evsel) {
                perf_cpu_map__put(cpus);
                return NULL;
        }

        (*idx)++;
        evsel->core.cpus = cpus;
        evsel->core.own_cpus = perf_cpu_map__get(cpus);
        evsel->core.system_wide = pmu ? pmu->is_uncore : false;
        evsel->auto_merge_stats = auto_merge_stats;

        if (name)
                evsel->name = strdup(name);

        if (config_terms)
                list_splice(config_terms, &evsel->config_terms);

        if (list)
                list_add_tail(&evsel->core.node, list);

        return evsel;
}

struct evsel *parse_events__add_event(int idx, struct perf_event_attr *attr,
                                        char *name, struct perf_pmu *pmu)
{
        return __add_event(NULL, &idx, attr, false, name, pmu, NULL, false,
                           NULL);
}

static int add_event(struct list_head *list, int *idx,
                     struct perf_event_attr *attr, char *name,
                     struct list_head *config_terms)
{
        return __add_event(list, idx, attr, true, name, NULL, config_terms,
                           false, NULL) ? 0 : -ENOMEM;
}

static int add_event_tool(struct list_head *list, int *idx,
                          enum perf_tool_event tool_event)
{
        struct evsel *evsel;
        struct perf_event_attr attr = {
                .type = PERF_TYPE_SOFTWARE,
                .config = PERF_COUNT_SW_DUMMY,
        };

        evsel = __add_event(list, idx, &attr, true, NULL, NULL, NULL, false,
                            "0");
        if (!evsel)
                return -ENOMEM;
        evsel->tool_event = tool_event;
        if (tool_event == PERF_TOOL_DURATION_TIME)
                evsel->unit = "ns";
        return 0;
}

static int parse_aliases(char *str, const char *names[][EVSEL__MAX_ALIASES], int size)
{
        int i, j;
        int n, longest = -1;

        for (i = 0; i < size; i++) {
                for (j = 0; j < EVSEL__MAX_ALIASES && names[i][j]; j++) {
                        n = strlen(names[i][j]);
                        if (n > longest && !strncasecmp(str, names[i][j], n))
                                longest = n;
                }
                if (longest > 0)
                        return i;
        }

        return -1;
}

typedef int config_term_func_t(struct perf_event_attr *attr,
                               struct parse_events_term *term,
                               struct parse_events_error *err);
static int config_term_common(struct perf_event_attr *attr,
                              struct parse_events_term *term,
                              struct parse_events_error *err);
static int config_attr(struct perf_event_attr *attr,
                       struct list_head *head,
                       struct parse_events_error *err,
                       config_term_func_t config_term);

int parse_events_add_cache(struct list_head *list, int *idx,
                           char *type, char *op_result1, char *op_result2,
                           struct parse_events_error *err,
                           struct list_head *head_config)
{
        struct perf_event_attr attr;
        LIST_HEAD(config_terms);
        char name[MAX_NAME_LEN], *config_name;
        int cache_type = -1, cache_op = -1, cache_result = -1;
        char *op_result[2] = { op_result1, op_result2 };
        int i, n;

        /*
         * No fallback - if we cannot get a clear cache type
         * then bail out:
         */
        cache_type = parse_aliases(type, evsel__hw_cache, PERF_COUNT_HW_CACHE_MAX);
        if (cache_type == -1)
                return -EINVAL;

        config_name = get_config_name(head_config);
        n = snprintf(name, MAX_NAME_LEN, "%s", type);

        for (i = 0; (i < 2) && (op_result[i]); i++) {
                char *str = op_result[i];

                n += snprintf(name + n, MAX_NAME_LEN - n, "-%s", str);

                if (cache_op == -1) {
                        cache_op = parse_aliases(str, evsel__hw_cache_op,
                                                 PERF_COUNT_HW_CACHE_OP_MAX);
                        if (cache_op >= 0) {
                                if (!evsel__is_cache_op_valid(cache_type, cache_op))
                                        return -EINVAL;
                                continue;
                        }
                }

                if (cache_result == -1) {
                        cache_result = parse_aliases(str, evsel__hw_cache_result,
                                                     PERF_COUNT_HW_CACHE_RESULT_MAX);
                        if (cache_result >= 0)
                                continue;
                }
        }

        /*
         * Fall back to reads:
         */
        if (cache_op == -1)
                cache_op = PERF_COUNT_HW_CACHE_OP_READ;

        /*
         * Fall back to accesses:
         */
        if (cache_result == -1)
                cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;

        memset(&attr, 0, sizeof(attr));
        attr.config = cache_type | (cache_op << 8) | (cache_result << 16);
        attr.type = PERF_TYPE_HW_CACHE;

        if (head_config) {
                if (config_attr(&attr, head_config, err,
                                config_term_common))
                        return -EINVAL;

                if (get_config_terms(head_config, &config_terms))
                        return -ENOMEM;
        }
        return add_event(list, idx, &attr, config_name ? : name, &config_terms);
}

static void tracepoint_error(struct parse_events_error *e, int err,
                             const char *sys, const char *name)
{
        const char *str;
        char help[BUFSIZ];

        if (!e)
                return;

        /*
         * We get error directly from syscall errno ( > 0),
         * or from encoded pointer's error ( < 0).
         */
        err = abs(err);

        switch (err) {
        case EACCES:
                str = "can't access trace events";
                break;
        case ENOENT:
                str = "unknown tracepoint";
                break;
        default:
                str = "failed to add tracepoint";
                break;
        }

        tracing_path__strerror_open_tp(err, help, sizeof(help), sys, name);
        parse_events__handle_error(e, 0, strdup(str), strdup(help));
}

static int add_tracepoint(struct list_head *list, int *idx,
                          const char *sys_name, const char *evt_name,
                          struct parse_events_error *err,
                          struct list_head *head_config)
{
        struct evsel *evsel = evsel__newtp_idx(sys_name, evt_name, (*idx)++);

        if (IS_ERR(evsel)) {
                tracepoint_error(err, PTR_ERR(evsel), sys_name, evt_name);
                return PTR_ERR(evsel);
        }

        if (head_config) {
                LIST_HEAD(config_terms);

                if (get_config_terms(head_config, &config_terms))
                        return -ENOMEM;
                list_splice(&config_terms, &evsel->config_terms);
        }

        list_add_tail(&evsel->core.node, list);
        return 0;
}

static int add_tracepoint_multi_event(struct list_head *list, int *idx,
                                      const char *sys_name, const char *evt_name,
                                      struct parse_events_error *err,
                                      struct list_head *head_config)
{
        char *evt_path;
        struct dirent *evt_ent;
        DIR *evt_dir;
        int ret = 0, found = 0;

        evt_path = get_events_file(sys_name);
        if (!evt_path) {
                tracepoint_error(err, errno, sys_name, evt_name);
                return -1;
        }
        evt_dir = opendir(evt_path);
        if (!evt_dir) {
                put_events_file(evt_path);
                tracepoint_error(err, errno, sys_name, evt_name);
                return -1;
        }

        while (!ret && (evt_ent = readdir(evt_dir))) {
                if (!strcmp(evt_ent->d_name, ".")
                    || !strcmp(evt_ent->d_name, "..")
                    || !strcmp(evt_ent->d_name, "enable")
                    || !strcmp(evt_ent->d_name, "filter"))
                        continue;

                if (!strglobmatch(evt_ent->d_name, evt_name))
                        continue;

                found++;

                ret = add_tracepoint(list, idx, sys_name, evt_ent->d_name,
                                     err, head_config);
        }

        if (!found) {
                tracepoint_error(err, ENOENT, sys_name, evt_name);
                ret = -1;
        }

        put_events_file(evt_path);
        closedir(evt_dir);
        return ret;
}

static int add_tracepoint_event(struct list_head *list, int *idx,
                                const char *sys_name, const char *evt_name,
                                struct parse_events_error *err,
                                struct list_head *head_config)
{
        return strpbrk(evt_name, "*?") ?
               add_tracepoint_multi_event(list, idx, sys_name, evt_name,
                                          err, head_config) :
               add_tracepoint(list, idx, sys_name, evt_name,
                              err, head_config);
}

static int add_tracepoint_multi_sys(struct list_head *list, int *idx,
                                    const char *sys_name, const char *evt_name,
                                    struct parse_events_error *err,
                                    struct list_head *head_config)
{
        struct dirent *events_ent;
        DIR *events_dir;
        int ret = 0;

        events_dir = tracing_events__opendir();
        if (!events_dir) {
                tracepoint_error(err, errno, sys_name, evt_name);
                return -1;
        }

        while (!ret && (events_ent = readdir(events_dir))) {
                if (!strcmp(events_ent->d_name, ".")
                    || !strcmp(events_ent->d_name, "..")
                    || !strcmp(events_ent->d_name, "enable")
                    || !strcmp(events_ent->d_name, "header_event")
                    || !strcmp(events_ent->d_name, "header_page"))
                        continue;

                if (!strglobmatch(events_ent->d_name, sys_name))
                        continue;

                ret = add_tracepoint_event(list, idx, events_ent->d_name,
                                           evt_name, err, head_config);
        }

        closedir(events_dir);
        return ret;
}

struct __add_bpf_event_param {
        struct parse_events_state *parse_state;
        struct list_head *list;
        struct list_head *head_config;
};

static int add_bpf_event(const char *group, const char *event, int fd, struct bpf_object *obj,
                         void *_param)
{
        LIST_HEAD(new_evsels);
        struct __add_bpf_event_param *param = _param;
        struct parse_events_state *parse_state = param->parse_state;
        struct list_head *list = param->list;
        struct evsel *pos;
        int err;
        /*
         * Check if we should add the event, i.e. if it is a TP but starts with a '!',
         * then don't add the tracepoint, this will be used for something else, like
         * adding to a BPF_MAP_TYPE_PROG_ARRAY.
         *
         * See tools/perf/examples/bpf/augmented_raw_syscalls.c
         */
        if (group[0] == '!')
                return 0;

        pr_debug("add bpf event %s:%s and attach bpf program %d\n",
                 group, event, fd);

        err = parse_events_add_tracepoint(&new_evsels, &parse_state->idx, group,
                                          event, parse_state->error,
                                          param->head_config);
        if (err) {
                struct evsel *evsel, *tmp;

                pr_debug("Failed to add BPF event %s:%s\n",
                         group, event);
                list_for_each_entry_safe(evsel, tmp, &new_evsels, core.node) {
                        list_del_init(&evsel->core.node);
                        evsel__delete(evsel);
                }
                return err;
        }
        pr_debug("adding %s:%s\n", group, event);

        list_for_each_entry(pos, &new_evsels, core.node) {
                pr_debug("adding %s:%s to %p\n",
                         group, event, pos);
                pos->bpf_fd = fd;
                pos->bpf_obj = obj;
        }
        list_splice(&new_evsels, list);
        return 0;
}

int parse_events_load_bpf_obj(struct parse_events_state *parse_state,
                              struct list_head *list,
                              struct bpf_object *obj,
                              struct list_head *head_config)
{
        int err;
        char errbuf[BUFSIZ];
        struct __add_bpf_event_param param = {parse_state, list, head_config};
        static bool registered_unprobe_atexit = false;

        if (IS_ERR(obj) || !obj) {
                snprintf(errbuf, sizeof(errbuf),
                         "Internal error: load bpf obj with NULL");
                err = -EINVAL;
                goto errout;
        }

        /*
         * Register atexit handler before calling bpf__probe() so
         * bpf__probe() don't need to unprobe probe points its already
         * created when failure.
         */
        if (!registered_unprobe_atexit) {
                atexit(bpf__clear);
                registered_unprobe_atexit = true;
        }

        err = bpf__probe(obj);
        if (err) {
                bpf__strerror_probe(obj, err, errbuf, sizeof(errbuf));
                goto errout;
        }

        err = bpf__load(obj);
        if (err) {
                bpf__strerror_load(obj, err, errbuf, sizeof(errbuf));
                goto errout;
        }

        err = bpf__foreach_event(obj, add_bpf_event, &param);
        if (err) {
                snprintf(errbuf, sizeof(errbuf),
                         "Attach events in BPF object failed");
                goto errout;
        }

        return 0;
errout:
        parse_events__handle_error(parse_state->error, 0,
                                strdup(errbuf), strdup("(add -v to see detail)"));
        return err;
}

static int
parse_events_config_bpf(struct parse_events_state *parse_state,
                        struct bpf_object *obj,
                        struct list_head *head_config)
{
        struct parse_events_term *term;
        int error_pos;

        if (!head_config || list_empty(head_config))
                return 0;

        list_for_each_entry(term, head_config, list) {
                int err;

                if (term->type_term != PARSE_EVENTS__TERM_TYPE_USER) {
                        parse_events__handle_error(parse_state->error, term->err_term,
                                                strdup("Invalid config term for BPF object"),
                                                NULL);
                        return -EINVAL;
                }

                err = bpf__config_obj(obj, term, parse_state->evlist, &error_pos);
                if (err) {
                        char errbuf[BUFSIZ];
                        int idx;

                        bpf__strerror_config_obj(obj, term, parse_state->evlist,
                                                 &error_pos, err, errbuf,
                                                 sizeof(errbuf));

                        if (err == -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE)
                                idx = term->err_val;
                        else
                                idx = term->err_term + error_pos;

                        parse_events__handle_error(parse_state->error, idx,
                                                strdup(errbuf),
                                                strdup(
"Hint:\tValid config terms:\n"
"     \tmap:[<arraymap>].value<indices>=[value]\n"
"     \tmap:[<eventmap>].event<indices>=[event]\n"
"\n"
"     \twhere <indices> is something like [0,3...5] or [all]\n"
"     \t(add -v to see detail)"));
                        return err;
                }
        }
        return 0;
}

/*
 * Split config terms:
 * perf record -e bpf.c/call-graph=fp,map:array.value[0]=1/ ...
 *  'call-graph=fp' is 'evt config', should be applied to each
 *  events in bpf.c.
 * 'map:array.value[0]=1' is 'obj config', should be processed
 * with parse_events_config_bpf.
 *
 * Move object config terms from the first list to obj_head_config.
 */
static void
split_bpf_config_terms(struct list_head *evt_head_config,
                       struct list_head *obj_head_config)
{
        struct parse_events_term *term, *temp;

        /*
         * Currectly, all possible user config term
         * belong to bpf object. parse_events__is_hardcoded_term()
         * happends to be a good flag.
         *
         * See parse_events_config_bpf() and
         * config_term_tracepoint().
         */
        list_for_each_entry_safe(term, temp, evt_head_config, list)
                if (!parse_events__is_hardcoded_term(term))
                        list_move_tail(&term->list, obj_head_config);
}

int parse_events_load_bpf(struct parse_events_state *parse_state,
                          struct list_head *list,
                          char *bpf_file_name,
                          bool source,
                          struct list_head *head_config)
{
        int err;
        struct bpf_object *obj;
        LIST_HEAD(obj_head_config);

        if (head_config)
                split_bpf_config_terms(head_config, &obj_head_config);

        obj = bpf__prepare_load(bpf_file_name, source);
        if (IS_ERR(obj)) {
                char errbuf[BUFSIZ];

                err = PTR_ERR(obj);

                if (err == -ENOTSUP)
                        snprintf(errbuf, sizeof(errbuf),
                                 "BPF support is not compiled");
                else
                        bpf__strerror_prepare_load(bpf_file_name,
                                                   source,
                                                   -err, errbuf,
                                                   sizeof(errbuf));

                parse_events__handle_error(parse_state->error, 0,
                                        strdup(errbuf), strdup("(add -v to see detail)"));
                return err;
        }

        err = parse_events_load_bpf_obj(parse_state, list, obj, head_config);
        if (err)
                return err;
        err = parse_events_config_bpf(parse_state, obj, &obj_head_config);

        /*
         * Caller doesn't know anything about obj_head_config,
         * so combine them together again before returnning.
         */
        if (head_config)
                list_splice_tail(&obj_head_config, head_config);
        return err;
}

static int
parse_breakpoint_type(const char *type, struct perf_event_attr *attr)
{
        int i;

        for (i = 0; i < 3; i++) {
                if (!type || !type[i])
                        break;

#define CHECK_SET_TYPE(bit)             \
do {                                    \
        if (attr->bp_type & bit)        \
                return -EINVAL;         \
        else                            \
                attr->bp_type |= bit;   \
} while (0)

                switch (type[i]) {
                case 'r':
                        CHECK_SET_TYPE(HW_BREAKPOINT_R);
                        break;
                case 'w':
                        CHECK_SET_TYPE(HW_BREAKPOINT_W);
                        break;
                case 'x':
                        CHECK_SET_TYPE(HW_BREAKPOINT_X);
                        break;
                default:
                        return -EINVAL;
                }
        }

#undef CHECK_SET_TYPE

        if (!attr->bp_type) /* Default */
                attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;

        return 0;
}

int parse_events_add_breakpoint(struct list_head *list, int *idx,
                                u64 addr, char *type, u64 len)
{
        struct perf_event_attr attr;

        memset(&attr, 0, sizeof(attr));
        attr.bp_addr = addr;

        if (parse_breakpoint_type(type, &attr))
                return -EINVAL;

        /* Provide some defaults if len is not specified */
        if (!len) {
                if (attr.bp_type == HW_BREAKPOINT_X)
                        len = sizeof(long);
                else
                        len = HW_BREAKPOINT_LEN_4;
        }

        attr.bp_len = len;

        attr.type = PERF_TYPE_BREAKPOINT;
        attr.sample_period = 1;

        return add_event(list, idx, &attr, NULL, NULL);
}

static int check_type_val(struct parse_events_term *term,
                          struct parse_events_error *err,
                          int type)
{
        if (type == term->type_val)
                return 0;

        if (err) {
                parse_events__handle_error(err, term->err_val,
                                        type == PARSE_EVENTS__TERM_TYPE_NUM
                                        ? strdup("expected numeric value")
                                        : strdup("expected string value"),
                                        NULL);
        }
        return -EINVAL;
}

/*
 * Update according to parse-events.l
 */
static const char *config_term_names[__PARSE_EVENTS__TERM_TYPE_NR] = {
        [PARSE_EVENTS__TERM_TYPE_USER]                  = "<sysfs term>",
        [PARSE_EVENTS__TERM_TYPE_CONFIG]                = "config",
        [PARSE_EVENTS__TERM_TYPE_CONFIG1]               = "config1",
        [PARSE_EVENTS__TERM_TYPE_CONFIG2]               = "config2",
        [PARSE_EVENTS__TERM_TYPE_NAME]                  = "name",
        [PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD]         = "period",
        [PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ]           = "freq",
        [PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE]    = "branch_type",
        [PARSE_EVENTS__TERM_TYPE_TIME]                  = "time",

        [PARSE_EVENTS__TERM_TYPE_CALLGRAPH]             = "call-graph",
        [PARSE_EVENTS__TERM_TYPE_STACKSIZE]             = "stack-size",
        [PARSE_EVENTS__TERM_TYPE_NOINHERIT]             = "no-inherit",
        [PARSE_EVENTS__TERM_TYPE_INHERIT]               = "inherit",
        [PARSE_EVENTS__TERM_TYPE_MAX_STACK]             = "max-stack",
        [PARSE_EVENTS__TERM_TYPE_MAX_EVENTS]            = "nr",
        [PARSE_EVENTS__TERM_TYPE_OVERWRITE]             = "overwrite",
        [PARSE_EVENTS__TERM_TYPE_NOOVERWRITE]           = "no-overwrite",
        [PARSE_EVENTS__TERM_TYPE_DRV_CFG]               = "driver-config",
        [PARSE_EVENTS__TERM_TYPE_PERCORE]               = "percore",
        [PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT]            = "aux-output",
        [PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE]       = "aux-sample-size",
};

static bool config_term_shrinked;

static bool
config_term_avail(int term_type, struct parse_events_error *err)
{
        char *err_str;

        if (term_type < 0 || term_type >= __PARSE_EVENTS__TERM_TYPE_NR) {
                parse_events__handle_error(err, -1,
                                        strdup("Invalid term_type"), NULL);
                return false;
        }
        if (!config_term_shrinked)
                return true;

        switch (term_type) {
        case PARSE_EVENTS__TERM_TYPE_CONFIG:
        case PARSE_EVENTS__TERM_TYPE_CONFIG1:
        case PARSE_EVENTS__TERM_TYPE_CONFIG2:
        case PARSE_EVENTS__TERM_TYPE_NAME:
        case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
        case PARSE_EVENTS__TERM_TYPE_PERCORE:
                return true;
        default:
                if (!err)
                        return false;

                /* term_type is validated so indexing is safe */
                if (asprintf(&err_str, "'%s' is not usable in 'perf stat'",
                                config_term_names[term_type]) >= 0)
                        parse_events__handle_error(err, -1, err_str, NULL);
                return false;
        }
}

void parse_events__shrink_config_terms(void)
{
        config_term_shrinked = true;
}

static int config_term_common(struct perf_event_attr *attr,
                              struct parse_events_term *term,
                              struct parse_events_error *err)
{
#define CHECK_TYPE_VAL(type)                                               \
do {                                                                       \
        if (check_type_val(term, err, PARSE_EVENTS__TERM_TYPE_ ## type)) \
                return -EINVAL;                                            \
} while (0)

        switch (term->type_term) {
        case PARSE_EVENTS__TERM_TYPE_CONFIG:
                CHECK_TYPE_VAL(NUM);
                attr->config = term->val.num;
                break;
        case PARSE_EVENTS__TERM_TYPE_CONFIG1:
                CHECK_TYPE_VAL(NUM);
                attr->config1 = term->val.num;
                break;
        case PARSE_EVENTS__TERM_TYPE_CONFIG2:
                CHECK_TYPE_VAL(NUM);
                attr->config2 = term->val.num;
                break;
        case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
                CHECK_TYPE_VAL(STR);
                if (strcmp(term->val.str, "no") &&
                    parse_branch_str(term->val.str,
                                    &attr->branch_sample_type)) {
                        parse_events__handle_error(err, term->err_val,
                                        strdup("invalid branch sample type"),
                                        NULL);
                        return -EINVAL;
                }
                break;
        case PARSE_EVENTS__TERM_TYPE_TIME:
                CHECK_TYPE_VAL(NUM);
                if (term->val.num > 1) {
                        parse_events__handle_error(err, term->err_val,
                                                strdup("expected 0 or 1"),
                                                NULL);
                        return -EINVAL;
                }
                break;
        case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
                CHECK_TYPE_VAL(STR);
                break;
        case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_INHERIT:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_NAME:
                CHECK_TYPE_VAL(STR);
                break;
        case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_PERCORE:
                CHECK_TYPE_VAL(NUM);
                if ((unsigned int)term->val.num > 1) {
                        parse_events__handle_error(err, term->err_val,
                                                strdup("expected 0 or 1"),
                                                NULL);
                        return -EINVAL;
                }
                break;
        case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
                CHECK_TYPE_VAL(NUM);
                break;
        case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
                CHECK_TYPE_VAL(NUM);
                if (term->val.num > UINT_MAX) {
                        parse_events__handle_error(err, term->err_val,
                                                strdup("too big"),
                                                NULL);
                        return -EINVAL;
                }
                break;
        default:
                parse_events__handle_error(err, term->err_term,
                                strdup("unknown term"),
                                parse_events_formats_error_string(NULL));
                return -EINVAL;
        }

        /*
         * Check term availbility after basic checking so
         * PARSE_EVENTS__TERM_TYPE_USER can be found and filtered.
         *
         * If check availbility at the entry of this function,
         * user will see "'<sysfs term>' is not usable in 'perf stat'"
         * if an invalid config term is provided for legacy events
         * (for example, instructions/badterm/...), which is confusing.
         */
        if (!config_term_avail(term->type_term, err))
                return -EINVAL;
        return 0;
#undef CHECK_TYPE_VAL
}

static int config_term_pmu(struct perf_event_attr *attr,
                           struct parse_events_term *term,
                           struct parse_events_error *err)
{
        if (term->type_term == PARSE_EVENTS__TERM_TYPE_USER ||
            term->type_term == PARSE_EVENTS__TERM_TYPE_DRV_CFG)
                /*
                 * Always succeed for sysfs terms, as we dont know
                 * at this point what type they need to have.
                 */
                return 0;
        else
                return config_term_common(attr, term, err);
}

static int config_term_tracepoint(struct perf_event_attr *attr,
                                  struct parse_events_term *term,
                                  struct parse_events_error *err)
{
        switch (term->type_term) {
        case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
        case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
        case PARSE_EVENTS__TERM_TYPE_INHERIT:
        case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
        case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
        case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
        case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
        case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
        case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
        case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
                return config_term_common(attr, term, err);
        default:
                if (err) {
                        parse_events__handle_error(err, term->err_term,
                                strdup("unknown term"),
                                strdup("valid terms: call-graph,stack-size\n"));
                }
                return -EINVAL;
        }

        return 0;
}

static int config_attr(struct perf_event_attr *attr,
                       struct list_head *head,
                       struct parse_events_error *err,
                       config_term_func_t config_term)
{
        struct parse_events_term *term;

        list_for_each_entry(term, head, list)
                if (config_term(attr, term, err))
                        return -EINVAL;

        return 0;
}

static int get_config_terms(struct list_head *head_config,
                            struct list_head *head_terms __maybe_unused)
{
#define ADD_CONFIG_TERM(__type, __weak)                         \
        struct evsel_config_term *__t;                  \
                                                                \
        __t = zalloc(sizeof(*__t));                             \
        if (!__t)                                               \
                return -ENOMEM;                                 \
                                                                \
        INIT_LIST_HEAD(&__t->list);                             \
        __t->type       = EVSEL__CONFIG_TERM_ ## __type;        \
        __t->weak       = __weak;                               \
        list_add_tail(&__t->list, head_terms)

#define ADD_CONFIG_TERM_VAL(__type, __name, __val, __weak)      \
do {                                                            \
        ADD_CONFIG_TERM(__type, __weak);                        \
        __t->val.__name = __val;                                \
} while (0)

#define ADD_CONFIG_TERM_STR(__type, __val, __weak)              \
do {                                                            \
        ADD_CONFIG_TERM(__type, __weak);                        \
        __t->val.str = strdup(__val);                           \
        if (!__t->val.str) {                                    \
                zfree(&__t);                                    \
                return -ENOMEM;                                 \
        }                                                       \
        __t->free_str = true;                                   \
} while (0)

        struct parse_events_term *term;

        list_for_each_entry(term, head_config, list) {
                switch (term->type_term) {
                case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
                        ADD_CONFIG_TERM_VAL(PERIOD, period, term->val.num, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
                        ADD_CONFIG_TERM_VAL(FREQ, freq, term->val.num, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_TIME:
                        ADD_CONFIG_TERM_VAL(TIME, time, term->val.num, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
                        ADD_CONFIG_TERM_STR(CALLGRAPH, term->val.str, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
                        ADD_CONFIG_TERM_STR(BRANCH, term->val.str, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
                        ADD_CONFIG_TERM_VAL(STACK_USER, stack_user,
                                            term->val.num, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_INHERIT:
                        ADD_CONFIG_TERM_VAL(INHERIT, inherit,
                                            term->val.num ? 1 : 0, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
                        ADD_CONFIG_TERM_VAL(INHERIT, inherit,
                                            term->val.num ? 0 : 1, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
                        ADD_CONFIG_TERM_VAL(MAX_STACK, max_stack,
                                            term->val.num, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
                        ADD_CONFIG_TERM_VAL(MAX_EVENTS, max_events,
                                            term->val.num, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
                        ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite,
                                            term->val.num ? 1 : 0, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
                        ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite,
                                            term->val.num ? 0 : 1, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
                        ADD_CONFIG_TERM_STR(DRV_CFG, term->val.str, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_PERCORE:
                        ADD_CONFIG_TERM_VAL(PERCORE, percore,
                                            term->val.num ? true : false, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
                        ADD_CONFIG_TERM_VAL(AUX_OUTPUT, aux_output,
                                            term->val.num ? 1 : 0, term->weak);
                        break;
                case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
                        ADD_CONFIG_TERM_VAL(AUX_SAMPLE_SIZE, aux_sample_size,
                                            term->val.num, term->weak);
                        break;
                default:
                        break;
                }
        }
        return 0;
}

/*
 * Add EVSEL__CONFIG_TERM_CFG_CHG where cfg_chg will have a bit set for
 * each bit of attr->config that the user has changed.
 */
static int get_config_chgs(struct perf_pmu *pmu, struct list_head *head_config,
                           struct list_head *head_terms)
{
        struct parse_events_term *term;
        u64 bits = 0;
        int type;

        list_for_each_entry(term, head_config, list) {
                switch (term->type_term) {
                case PARSE_EVENTS__TERM_TYPE_USER:
                        type = perf_pmu__format_type(&pmu->format, term->config);
                        if (type != PERF_PMU_FORMAT_VALUE_CONFIG)
                                continue;
                        bits |= perf_pmu__format_bits(&pmu->format, term->config);
                        break;
                case PARSE_EVENTS__TERM_TYPE_CONFIG:
                        bits = ~(u64)0;
                        break;
                default:
                        break;
                }
        }

        if (bits)
                ADD_CONFIG_TERM_VAL(CFG_CHG, cfg_chg, bits, false);

#undef ADD_CONFIG_TERM
        return 0;
}

int parse_events_add_tracepoint(struct list_head *list, int *idx,
                                const char *sys, const char *event,
                                struct parse_events_error *err,
                                struct list_head *head_config)
{
        if (head_config) {
                struct perf_event_attr attr;

                if (config_attr(&attr, head_config, err,
                                config_term_tracepoint))
                        return -EINVAL;
        }

        if (strpbrk(sys, "*?"))
                return add_tracepoint_multi_sys(list, idx, sys, event,
                                                err, head_config);
        else
                return add_tracepoint_event(list, idx, sys, event,
                                            err, head_config);
}

int parse_events_add_numeric(struct parse_events_state *parse_state,
                             struct list_head *list,
                             u32 type, u64 config,
                             struct list_head *head_config)
{
        struct perf_event_attr attr;
        LIST_HEAD(config_terms);

        memset(&attr, 0, sizeof(attr));
        attr.type = type;
        attr.config = config;

        if (head_config) {
                if (config_attr(&attr, head_config, parse_state->error,
                                config_term_common))
                        return -EINVAL;

                if (get_config_terms(head_config, &config_terms))
                        return -ENOMEM;
        }

        return add_event(list, &parse_state->idx, &attr,
                         get_config_name(head_config), &config_terms);
}

int parse_events_add_tool(struct parse_events_state *parse_state,
                          struct list_head *list,
                          enum perf_tool_event tool_event)
{
        return add_event_tool(list, &parse_state->idx, tool_event);
}

static bool config_term_percore(struct list_head *config_terms)
{
        struct evsel_config_term *term;

        list_for_each_entry(term, config_terms, list) {
                if (term->type == EVSEL__CONFIG_TERM_PERCORE)
                        return term->val.percore;
        }

        return false;
}

int parse_events_add_pmu(struct parse_events_state *parse_state,
                         struct list_head *list, char *name,
                         struct list_head *head_config,
                         bool auto_merge_stats,
                         bool use_alias)
{
        struct perf_event_attr attr;
        struct perf_pmu_info info;
        struct perf_pmu *pmu;
        struct evsel *evsel;
        struct parse_events_error *err = parse_state->error;
        bool use_uncore_alias;
        LIST_HEAD(config_terms);

        if (verbose > 1) {
                fprintf(stderr, "Attempting to add event pmu '%s' with '",
                        name);
                if (head_config) {
                        struct parse_events_term *term;

                        list_for_each_entry(term, head_config, list) {
                                fprintf(stderr, "%s,", term->config);
                        }
                }
                fprintf(stderr, "' that may result in non-fatal errors\n");
        }

        pmu = parse_state->fake_pmu ?: perf_pmu__find(name);
        if (!pmu) {
                char *err_str;

                if (asprintf(&err_str,
                                "Cannot find PMU `%s'. Missing kernel support?",
                                name) >= 0)
                        parse_events__handle_error(err, 0, err_str, NULL);
                return -EINVAL;
        }

        if (pmu->default_config) {
                memcpy(&attr, pmu->default_config,
                       sizeof(struct perf_event_attr));
        } else {
                memset(&attr, 0, sizeof(attr));
        }

        use_uncore_alias = (pmu->is_uncore && use_alias);

        if (!head_config) {
                attr.type = pmu->type;
                evsel = __add_event(list, &parse_state->idx, &attr, true, NULL,
                                    pmu, NULL, auto_merge_stats, NULL);
                if (evsel) {
                        evsel->pmu_name = name ? strdup(name) : NULL;
                        evsel->use_uncore_alias = use_uncore_alias;
                        return 0;
                } else {
                        return -ENOMEM;
                }
        }

        if (!parse_state->fake_pmu && perf_pmu__check_alias(pmu, head_config, &info))
                return -EINVAL;

        if (verbose > 1) {
                fprintf(stderr, "After aliases, add event pmu '%s' with '",
                        name);
                if (head_config) {
                        struct parse_events_term *term;

                        list_for_each_entry(term, head_config, list) {
                                fprintf(stderr, "%s,", term->config);
                        }
                }
                fprintf(stderr, "' that may result in non-fatal errors\n");
        }

        /*
         * Configure hardcoded terms first, no need to check
         * return value when called with fail == 0 ;)
         */
        if (config_attr(&attr, head_config, parse_state->error, config_term_pmu))
                return -EINVAL;

        if (get_config_terms(head_config, &config_terms))
                return -ENOMEM;

        /*
         * When using default config, record which bits of attr->config were
         * changed by the user.
         */
        if (pmu->default_config && get_config_chgs(pmu, head_config, &config_terms))
                return -ENOMEM;

        if (!parse_state->fake_pmu && perf_pmu__config(pmu, &attr, head_config, parse_state->error)) {
                struct evsel_config_term *pos, *tmp;

                list_for_each_entry_safe(pos, tmp, &config_terms, list) {
                        list_del_init(&pos->list);
                        if (pos->free_str)
                                zfree(&pos->val.str);
                        free(pos);
                }
                return -EINVAL;
        }

        evsel = __add_event(list, &parse_state->idx, &attr, true,
                            get_config_name(head_config), pmu,
                            &config_terms, auto_merge_stats, NULL);
        if (!evsel)
                return -ENOMEM;

        evsel->pmu_name = name ? strdup(name) : NULL;
        evsel->use_uncore_alias = use_uncore_alias;
        evsel->percore = config_term_percore(&evsel->config_terms);

        if (parse_state->fake_pmu)
                return 0;

        evsel->unit = info.unit;
        evsel->scale = info.scale;
        evsel->per_pkg = info.per_pkg;
        evsel->snapshot = info.snapshot;
        evsel->metric_expr = info.metric_expr;
        evsel->metric_name = info.metric_name;
        return 0;
}

int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
                               char *str, struct list_head **listp)
{
        struct parse_events_term *term;
        struct list_head *list;
        struct perf_pmu *pmu = NULL;
        int ok = 0;

        *listp = NULL;
        /* Add it for all PMUs that support the alias */
        list = malloc(sizeof(struct list_head));
        if (!list)
                return -1;
        INIT_LIST_HEAD(list);
        while ((pmu = perf_pmu__scan(pmu)) != NULL) {
                struct perf_pmu_alias *alias;

                list_for_each_entry(alias, &pmu->aliases, list) {
                        if (!strcasecmp(alias->name, str)) {
                                struct list_head *head;
                                char *config;

                                head = malloc(sizeof(struct list_head));
                                if (!head)
                                        return -1;
                                INIT_LIST_HEAD(head);
                                config = strdup(str);
                                if (!config)
                                        return -1;
                                if (parse_events_term__num(&term,
                                                   PARSE_EVENTS__TERM_TYPE_USER,
                                                   config, 1, false, &config,
                                                   NULL) < 0) {
                                        free(list);
                                        free(config);
                                        return -1;
                                }
                                list_add_tail(&term->list, head);

                                if (!parse_events_add_pmu(parse_state, list,
                                                          pmu->name, head,
                                                          true, true)) {
                                        pr_debug("%s -> %s/%s/\n", str,
                                                 pmu->name, alias->str);
                                        ok++;
                                }

                                parse_events_terms__delete(head);
                        }
                }
        }
        if (!ok) {
                free(list);
                return -1;
        }
        *listp = list;
        return 0;
}

int parse_events__modifier_group(struct list_head *list,
                                 char *event_mod)
{
        return parse_events__modifier_event(list, event_mod, true);
}

/*
 * Check if the two uncore PMUs are from the same uncore block
 * The format of the uncore PMU name is uncore_#blockname_#pmuidx
 */
static bool is_same_uncore_block(const char *pmu_name_a, const char *pmu_name_b)
{
        char *end_a, *end_b;

        end_a = strrchr(pmu_name_a, '_');
        end_b = strrchr(pmu_name_b, '_');

        if (!end_a || !end_b)
                return false;

        if ((end_a - pmu_name_a) != (end_b - pmu_name_b))
                return false;

        return (strncmp(pmu_name_a, pmu_name_b, end_a - pmu_name_a) == 0);
}

static int
parse_events__set_leader_for_uncore_aliase(char *name, struct list_head *list,
                                           struct parse_events_state *parse_state)
{
        struct evsel *evsel, *leader;
        uintptr_t *leaders;
        bool is_leader = true;
        int i, nr_pmu = 0, total_members, ret = 0;

        leader = list_first_entry(list, struct evsel, core.node);
        evsel = list_last_entry(list, struct evsel, core.node);
        total_members = evsel->idx - leader->idx + 1;

        leaders = calloc(total_members, sizeof(uintptr_t));
        if (WARN_ON(!leaders))
                return 0;

        /*
         * Going through the whole group and doing sanity check.
         * All members must use alias, and be from the same uncore block.
         * Also, storing the leader events in an array.
         */
        __evlist__for_each_entry(list, evsel) {

                /* Only split the uncore group which members use alias */
                if (!evsel->use_uncore_alias)
                        goto out;

                /* The events must be from the same uncore block */
                if (!is_same_uncore_block(leader->pmu_name, evsel->pmu_name))
                        goto out;

                if (!is_leader)
                        continue;
                /*
                 * If the event's PMU name starts to repeat, it must be a new
                 * event. That can be used to distinguish the leader from
                 * other members, even they have the same event name.
                 */
                if ((leader != evsel) &&
                    !strcmp(leader->pmu_name, evsel->pmu_name)) {
                        is_leader = false;
                        continue;
                }

                /* Store the leader event for each PMU */
                leaders[nr_pmu++] = (uintptr_t) evsel;
        }

        /* only one event alias */
        if (nr_pmu == total_members) {
                parse_state->nr_groups--;
                goto handled;
        }

        /*
         * An uncore event alias is a joint name which means the same event
         * runs on all PMUs of a block.
         * Perf doesn't support mixed events from different PMUs in the same
         * group. The big group has to be split into multiple small groups
         * which only include the events from the same PMU.
         *
         * Here the uncore event aliases must be from the same uncore block.
         * The number of PMUs must be same for each alias. The number of new
         * small groups equals to the number of PMUs.
         * Setting the leader event for corresponding members in each group.
         */
        i = 0;
        __evlist__for_each_entry(list, evsel) {
                if (i >= nr_pmu)
                        i = 0;
                evsel->leader = (struct evsel *) leaders[i++];
        }

        /* The number of members and group name are same for each group */
        for (i = 0; i < nr_pmu; i++) {
                evsel = (struct evsel *) leaders[i];
                evsel->core.nr_members = total_members / nr_pmu;
                evsel->group_name = name ? strdup(name) : NULL;
        }

        /* Take the new small groups into account */
        parse_state->nr_groups += nr_pmu - 1;

handled:
        ret = 1;
out:
        free(leaders);
        return ret;
}

void parse_events__set_leader(char *name, struct list_head *list,
                              struct parse_events_state *parse_state)
{
        struct evsel *leader;

        if (list_empty(list)) {
                WARN_ONCE(true, "WARNING: failed to set leader: empty list");
                return;
        }

        if (parse_events__set_leader_for_uncore_aliase(name, list, parse_state))
                return;

        __perf_evlist__set_leader(list);
        leader = list_entry(list->next, struct evsel, core.node);
        leader->group_name = name ? strdup(name) : NULL;
}

/* list_event is assumed to point to malloc'ed memory */
void parse_events_update_lists(struct list_head *list_event,
                               struct list_head *list_all)
{
        /*
         * Called for single event definition. Update the
         * 'all event' list, and reinit the 'single event'
         * list, for next event definition.
         */
        list_splice_tail(list_event, list_all);
        free(list_event);
}

struct event_modifier {
        int eu;
        int ek;
        int eh;
        int eH;
        int eG;
        int eI;
        int precise;
        int precise_max;
        int exclude_GH;
        int sample_read;
        int pinned;
        int weak;
        int exclusive;
};

static int get_event_modifier(struct event_modifier *mod, char *str,
                               struct evsel *evsel)
{
        int eu = evsel ? evsel->core.attr.exclude_user : 0;
        int ek = evsel ? evsel->core.attr.exclude_kernel : 0;
        int eh = evsel ? evsel->core.attr.exclude_hv : 0;
        int eH = evsel ? evsel->core.attr.exclude_host : 0;
        int eG = evsel ? evsel->core.attr.exclude_guest : 0;
        int eI = evsel ? evsel->core.attr.exclude_idle : 0;
        int precise = evsel ? evsel->core.attr.precise_ip : 0;
        int precise_max = 0;
        int sample_read = 0;
        int pinned = evsel ? evsel->core.attr.pinned : 0;
        int exclusive = evsel ? evsel->core.attr.exclusive : 0;

        int exclude = eu | ek | eh;
        int exclude_GH = evsel ? evsel->exclude_GH : 0;
        int weak = 0;

        memset(mod, 0, sizeof(*mod));

        while (*str) {
                if (*str == 'u') {
                        if (!exclude)
                                exclude = eu = ek = eh = 1;
                        if (!exclude_GH && !perf_guest)
                                eG = 1;
                        eu = 0;
                } else if (*str == 'k') {
                        if (!exclude)
                                exclude = eu = ek = eh = 1;
                        ek = 0;
                } else if (*str == 'h') {
                        if (!exclude)
                                exclude = eu = ek = eh = 1;
                        eh = 0;
                } else if (*str == 'G') {
                        if (!exclude_GH)
                                exclude_GH = eG = eH = 1;
                        eG = 0;
                } else if (*str == 'H') {
                        if (!exclude_GH)
                                exclude_GH = eG = eH = 1;
                        eH = 0;
                } else if (*str == 'I') {
                        eI = 1;
                } else if (*str == 'p') {
                        precise++;
                        /* use of precise requires exclude_guest */
                        if (!exclude_GH)
                                eG = 1;
                } else if (*str == 'P') {
                        precise_max = 1;
                } else if (*str == 'S') {
                        sample_read = 1;
                } else if (*str == 'D') {
                        pinned = 1;
                } else if (*str == 'e') {
                        exclusive = 1;
                } else if (*str == 'W') {
                        weak = 1;
                } else
                        break;

                ++str;
        }

        /*
         * precise ip:
         *
         *  0 - SAMPLE_IP can have arbitrary skid
         *  1 - SAMPLE_IP must have constant skid
         *  2 - SAMPLE_IP requested to have 0 skid
         *  3 - SAMPLE_IP must have 0 skid
         *
         *  See also PERF_RECORD_MISC_EXACT_IP
         */
        if (precise > 3)
                return -EINVAL;

        mod->eu = eu;
        mod->ek = ek;
        mod->eh = eh;
        mod->eH = eH;
        mod->eG = eG;
        mod->eI = eI;
        mod->precise = precise;
        mod->precise_max = precise_max;
        mod->exclude_GH = exclude_GH;
        mod->sample_read = sample_read;
        mod->pinned = pinned;
        mod->weak = weak;
        mod->exclusive = exclusive;

        return 0;
}

/*
 * Basic modifier sanity check to validate it contains only one
 * instance of any modifier (apart from 'p') present.
 */
static int check_modifier(char *str)
{
        char *p = str;

        /* The sizeof includes 0 byte as well. */
        if (strlen(str) > (sizeof("ukhGHpppPSDIWe") - 1))
                return -1;

        while (*p) {
                if (*p != 'p' && strchr(p + 1, *p))
                        return -1;
                p++;
        }

        return 0;
}

int parse_events__modifier_event(struct list_head *list, char *str, bool add)
{
        struct evsel *evsel;
        struct event_modifier mod;

        if (str == NULL)
                return 0;

        if (check_modifier(str))
                return -EINVAL;

        if (!add && get_event_modifier(&mod, str, NULL))
                return -EINVAL;

        __evlist__for_each_entry(list, evsel) {
                if (add && get_event_modifier(&mod, str, evsel))
                        return -EINVAL;

                evsel->core.attr.exclude_user   = mod.eu;
                evsel->core.attr.exclude_kernel = mod.ek;
                evsel->core.attr.exclude_hv     = mod.eh;
                evsel->core.attr.precise_ip     = mod.precise;
                evsel->core.attr.exclude_host   = mod.eH;
                evsel->core.attr.exclude_guest  = mod.eG;
                evsel->core.attr.exclude_idle   = mod.eI;
                evsel->exclude_GH          = mod.exclude_GH;
                evsel->sample_read         = mod.sample_read;
                evsel->precise_max         = mod.precise_max;
                evsel->weak_group          = mod.weak;

                if (evsel__is_group_leader(evsel)) {
                        evsel->core.attr.pinned = mod.pinned;
                        evsel->core.attr.exclusive = mod.exclusive;
                }
        }

        return 0;
}

int parse_events_name(struct list_head *list, char *name)
{
        struct evsel *evsel;

        __evlist__for_each_entry(list, evsel) {
                if (!evsel->name)
                        evsel->name = strdup(name);
        }

        return 0;
}

static int
comp_pmu(const void *p1, const void *p2)
{
        struct perf_pmu_event_symbol *pmu1 = (struct perf_pmu_event_symbol *) p1;
        struct perf_pmu_event_symbol *pmu2 = (struct perf_pmu_event_symbol *) p2;

        return strcasecmp(pmu1->symbol, pmu2->symbol);
}

static void perf_pmu__parse_cleanup(void)
{
        if (perf_pmu_events_list_num > 0) {
                struct perf_pmu_event_symbol *p;
                int i;

                for (i = 0; i < perf_pmu_events_list_num; i++) {
                        p = perf_pmu_events_list + i;
                        zfree(&p->symbol);
                }
                zfree(&perf_pmu_events_list);
                perf_pmu_events_list_num = 0;
        }
}

#define SET_SYMBOL(str, stype)          \
do {                                    \
        p->symbol = str;                \
        if (!p->symbol)                 \
                goto err;               \
        p->type = stype;                \
} while (0)

/*
 * Read the pmu events list from sysfs
 * Save it into perf_pmu_events_list
 */
static void perf_pmu__parse_init(void)
{

        struct perf_pmu *pmu = NULL;
        struct perf_pmu_alias *alias;
        int len = 0;

        pmu = NULL;
        while ((pmu = perf_pmu__scan(pmu)) != NULL) {
                list_for_each_entry(alias, &pmu->aliases, list) {
                        if (strchr(alias->name, '-'))
                                len++;
                        len++;
                }
        }

        if (len == 0) {
                perf_pmu_events_list_num = -1;
                return;
        }
        perf_pmu_events_list = malloc(sizeof(struct perf_pmu_event_symbol) * len);
        if (!perf_pmu_events_list)
                return;
        perf_pmu_events_list_num = len;

        len = 0;
        pmu = NULL;
        while ((pmu = perf_pmu__scan(pmu)) != NULL) {
                list_for_each_entry(alias, &pmu->aliases, list) {
                        struct perf_pmu_event_symbol *p = perf_pmu_events_list + len;
                        char *tmp = strchr(alias->name, '-');

                        if (tmp != NULL) {
                                SET_SYMBOL(strndup(alias->name, tmp - alias->name),
                                                PMU_EVENT_SYMBOL_PREFIX);
                                p++;
                                SET_SYMBOL(strdup(++tmp), PMU_EVENT_SYMBOL_SUFFIX);
                                len += 2;
                        } else {
                                SET_SYMBOL(strdup(alias->name), PMU_EVENT_SYMBOL);
                                len++;
                        }
                }
        }
        qsort(perf_pmu_events_list, len,
                sizeof(struct perf_pmu_event_symbol), comp_pmu);

        return;
err:
        perf_pmu__parse_cleanup();
}

/*
 * This function injects special term in
 * perf_pmu_events_list so the test code
 * can check on this functionality.
 */
int perf_pmu__test_parse_init(void)
{
        struct perf_pmu_event_symbol *list;

        list = malloc(sizeof(*list) * 1);
        if (!list)
                return -ENOMEM;

        list->type   = PMU_EVENT_SYMBOL;
        list->symbol = strdup("read");

        if (!list->symbol) {
                free(list);
                return -ENOMEM;
        }

        perf_pmu_events_list = list;
        perf_pmu_events_list_num = 1;
        return 0;
}

enum perf_pmu_event_symbol_type
perf_pmu__parse_check(const char *name)
{
        struct perf_pmu_event_symbol p, *r;

        /* scan kernel pmu events from sysfs if needed */
        if (perf_pmu_events_list_num == 0)
                perf_pmu__parse_init();
        /*
         * name "cpu" could be prefix of cpu-cycles or cpu// events.
         * cpu-cycles has been handled by hardcode.
         * So it must be cpu// events, not kernel pmu event.
         */
        if ((perf_pmu_events_list_num <= 0) || !strcmp(name, "cpu"))
                return PMU_EVENT_SYMBOL_ERR;

        p.symbol = strdup(name);
        r = bsearch(&p, perf_pmu_events_list,
                        (size_t) perf_pmu_events_list_num,
                        sizeof(struct perf_pmu_event_symbol), comp_pmu);
        zfree(&p.symbol);
        return r ? r->type : PMU_EVENT_SYMBOL_ERR;
}

static int parse_events__scanner(const char *str,
                                 struct parse_events_state *parse_state)
{
        YY_BUFFER_STATE buffer;
        void *scanner;
        int ret;

        ret = parse_events_lex_init_extra(parse_state, &scanner);
        if (ret)
                return ret;

        buffer = parse_events__scan_string(str, scanner);

#ifdef PARSER_DEBUG
        parse_events_debug = 1;
        parse_events_set_debug(1, scanner);
#endif
        ret = parse_events_parse(parse_state, scanner);

        parse_events__flush_buffer(buffer, scanner);
        parse_events__delete_buffer(buffer, scanner);
        parse_events_lex_destroy(scanner);
        return ret;
}

/*
 * parse event config string, return a list of event terms.
 */
int parse_events_terms(struct list_head *terms, const char *str)
{
        struct parse_events_state parse_state = {
                .terms  = NULL,
                .stoken = PE_START_TERMS,
        };
        int ret;

        ret = parse_events__scanner(str, &parse_state);
        perf_pmu__parse_cleanup();

        if (!ret) {
                list_splice(parse_state.terms, terms);
                zfree(&parse_state.terms);
                return 0;
        }

        parse_events_terms__delete(parse_state.terms);
        return ret;
}

int __parse_events(struct evlist *evlist, const char *str,
                   struct parse_events_error *err, struct perf_pmu *fake_pmu)
{
        struct parse_events_state parse_state = {
                .list     = LIST_HEAD_INIT(parse_state.list),
                .idx      = evlist->core.nr_entries,
                .error    = err,
                .evlist   = evlist,
                .stoken   = PE_START_EVENTS,
                .fake_pmu = fake_pmu,
        };
        int ret;

        ret = parse_events__scanner(str, &parse_state);
        perf_pmu__parse_cleanup();

        if (!ret && list_empty(&parse_state.list)) {
                WARN_ONCE(true, "WARNING: event parser found nothing\n");
                return -1;
        }

        /*
         * Add list to the evlist even with errors to allow callers to clean up.
         */
        perf_evlist__splice_list_tail(evlist, &parse_state.list);

        if (!ret) {
                struct evsel *last;

                evlist->nr_groups += parse_state.nr_groups;
                last = evlist__last(evlist);
                last->cmdline_group_boundary = true;

                return 0;
        }

        /*
         * There are 2 users - builtin-record and builtin-test objects.
         * Both call evlist__delete in case of error, so we dont
         * need to bother.
         */
        return ret;
}

#define MAX_WIDTH 1000
static int get_term_width(void)
{
        struct winsize ws;

        get_term_dimensions(&ws);
        return ws.ws_col > MAX_WIDTH ? MAX_WIDTH : ws.ws_col;
}

static void __parse_events_print_error(int err_idx, const char *err_str,
                                const char *err_help, const char *event)
{
        const char *str = "invalid or unsupported event: ";
        char _buf[MAX_WIDTH];
        char *buf = (char *) event;
        int idx = 0;
        if (err_str) {
                /* -2 for extra '' in the final fprintf */
                int width       = get_term_width() - 2;
                int len_event   = strlen(event);
                int len_str, max_len, cut = 0;

                /*
                 * Maximum error index indent, we will cut
                 * the event string if it's bigger.
                 */
                int max_err_idx = 13;

                /*
                 * Let's be specific with the message when
                 * we have the precise error.
                 */
                str     = "event syntax error: ";
                len_str = strlen(str);
                max_len = width - len_str;

                buf = _buf;

                /* We're cutting from the beginning. */
                if (err_idx > max_err_idx)
                        cut = err_idx - max_err_idx;

                strncpy(buf, event + cut, max_len);

                /* Mark cut parts with '..' on both sides. */
                if (cut)
                        buf[0] = buf[1] = '.';

                if ((len_event - cut) > max_len) {
                        buf[max_len - 1] = buf[max_len - 2] = '.';
                        buf[max_len] = 0;
                }

                idx = len_str + err_idx - cut;
        }

        fprintf(stderr, "%s'%s'\n", str, buf);
        if (idx) {
                fprintf(stderr, "%*s\\___ %s\n", idx + 1, "", err_str);
                if (err_help)
                        fprintf(stderr, "\n%s\n", err_help);
        }
}

void parse_events_print_error(struct parse_events_error *err,
                              const char *event)
{
        if (!err->num_errors)
                return;

        __parse_events_print_error(err->idx, err->str, err->help, event);
        zfree(&err->str);
        zfree(&err->help);

        if (err->num_errors > 1) {
                fputs("\nInitial error:\n", stderr);
                __parse_events_print_error(err->first_idx, err->first_str,
                                        err->first_help, event);
                zfree(&err->first_str);
                zfree(&err->first_help);
        }
}

#undef MAX_WIDTH

int parse_events_option(const struct option *opt, const char *str,
                        int unset __maybe_unused)
{
        struct evlist *evlist = *(struct evlist **)opt->value;
        struct parse_events_error err;
        int ret;

        bzero(&err, sizeof(err));
        ret = parse_events(evlist, str, &err);

        if (ret) {
                parse_events_print_error(&err, str);
                fprintf(stderr, "Run 'perf list' for a list of valid events\n");
        }

        return ret;
}

int parse_events_option_new_evlist(const struct option *opt, const char *str, int unset)
{
        struct evlist **evlistp = opt->value;
        int ret;

        if (*evlistp == NULL) {
                *evlistp = evlist__new();

                if (*evlistp == NULL) {
                        fprintf(stderr, "Not enough memory to create evlist\n");
                        return -1;
                }
        }

        ret = parse_events_option(opt, str, unset);
        if (ret) {
                evlist__delete(*evlistp);
                *evlistp = NULL;
        }

        return ret;
}

static int
foreach_evsel_in_last_glob(struct evlist *evlist,
                           int (*func)(struct evsel *evsel,
                                       const void *arg),
                           const void *arg)
{
        struct evsel *last = NULL;
        int err;

        /*
         * Don't return when list_empty, give func a chance to report
         * error when it found last == NULL.
         *
         * So no need to WARN here, let *func do this.
         */
        if (evlist->core.nr_entries > 0)
                last = evlist__last(evlist);

        do {
                err = (*func)(last, arg);
                if (err)
                        return -1;
                if (!last)
                        return 0;

                if (last->core.node.prev == &evlist->core.entries)
                        return 0;
                last = list_entry(last->core.node.prev, struct evsel, core.node);
        } while (!last->cmdline_group_boundary);

        return 0;
}

static int set_filter(struct evsel *evsel, const void *arg)
{
        const char *str = arg;
        bool found = false;
        int nr_addr_filters = 0;
        struct perf_pmu *pmu = NULL;

        if (evsel == NULL) {
                fprintf(stderr,
                        "--filter option should follow a -e tracepoint or HW tracer option\n");
                return -1;
        }

        if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT) {
                if (evsel__append_tp_filter(evsel, str) < 0) {
                        fprintf(stderr,
                                "not enough memory to hold filter string\n");
                        return -1;
                }

                return 0;
        }

        while ((pmu = perf_pmu__scan(pmu)) != NULL)
                if (pmu->type == evsel->core.attr.type) {
                        found = true;
                        break;
                }

        if (found)
                perf_pmu__scan_file(pmu, "nr_addr_filters",
                                    "%d", &nr_addr_filters);

        if (!nr_addr_filters) {
                fprintf(stderr,
                        "This CPU does not support address filtering\n");
                return -1;
        }

        if (evsel__append_addr_filter(evsel, str) < 0) {
                fprintf(stderr,
                        "not enough memory to hold filter string\n");
                return -1;
        }

        return 0;
}

int parse_filter(const struct option *opt, const char *str,
                 int unset __maybe_unused)
{
        struct evlist *evlist = *(struct evlist **)opt->value;

        return foreach_evsel_in_last_glob(evlist, set_filter,
                                          (const void *)str);
}

static int add_exclude_perf_filter(struct evsel *evsel,
                                   const void *arg __maybe_unused)
{
        char new_filter[64];

        if (evsel == NULL || evsel->core.attr.type != PERF_TYPE_TRACEPOINT) {
                fprintf(stderr,
                        "--exclude-perf option should follow a -e tracepoint option\n");
                return -1;
        }

        snprintf(new_filter, sizeof(new_filter), "common_pid != %d", getpid());

        if (evsel__append_tp_filter(evsel, new_filter) < 0) {
                fprintf(stderr,
                        "not enough memory to hold filter string\n");
                return -1;
        }

        return 0;
}

int exclude_perf(const struct option *opt,
                 const char *arg __maybe_unused,
                 int unset __maybe_unused)
{
        struct evlist *evlist = *(struct evlist **)opt->value;

        return foreach_evsel_in_last_glob(evlist, add_exclude_perf_filter,
                                          NULL);
}

static const char * const event_type_descriptors[] = {
        "Hardware event",
        "Software event",
        "Tracepoint event",
        "Hardware cache event",
        "Raw hardware event descriptor",
        "Hardware breakpoint",
};

static int cmp_string(const void *a, const void *b)
{
        const char * const *as = a;
        const char * const *bs = b;

        return strcmp(*as, *bs);
}

/*
 * Print the events from <debugfs_mount_point>/tracing/events
 */

void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
                             bool name_only)
{
        DIR *sys_dir, *evt_dir;
        struct dirent *sys_dirent, *evt_dirent;
        char evt_path[MAXPATHLEN];
        char *dir_path;
        char **evt_list = NULL;
        unsigned int evt_i = 0, evt_num = 0;
        bool evt_num_known = false;

restart:
        sys_dir = tracing_events__opendir();
        if (!sys_dir)
                return;

        if (evt_num_known) {
                evt_list = zalloc(sizeof(char *) * evt_num);
                if (!evt_list)
                        goto out_close_sys_dir;
        }

        for_each_subsystem(sys_dir, sys_dirent) {
                if (subsys_glob != NULL &&
                    !strglobmatch(sys_dirent->d_name, subsys_glob))
                        continue;

                dir_path = get_events_file(sys_dirent->d_name);
                if (!dir_path)
                        continue;
                evt_dir = opendir(dir_path);
                if (!evt_dir)
                        goto next;

                for_each_event(dir_path, evt_dir, evt_dirent) {
                        if (event_glob != NULL &&
                            !strglobmatch(evt_dirent->d_name, event_glob))
                                continue;

                        if (!evt_num_known) {
                                evt_num++;
                                continue;
                        }

                        snprintf(evt_path, MAXPATHLEN, "%s:%s",
                                 sys_dirent->d_name, evt_dirent->d_name);

                        evt_list[evt_i] = strdup(evt_path);
                        if (evt_list[evt_i] == NULL) {
                                put_events_file(dir_path);
                                goto out_close_evt_dir;
                        }
                        evt_i++;
                }
                closedir(evt_dir);
next:
                put_events_file(dir_path);
        }
        closedir(sys_dir);

        if (!evt_num_known) {
                evt_num_known = true;
                goto restart;
        }
        qsort(evt_list, evt_num, sizeof(char *), cmp_string);
        evt_i = 0;
        while (evt_i < evt_num) {
                if (name_only) {
                        printf("%s ", evt_list[evt_i++]);
                        continue;
                }
                printf("  %-50s [%s]\n", evt_list[evt_i++],
                                event_type_descriptors[PERF_TYPE_TRACEPOINT]);
        }
        if (evt_num && pager_in_use())
                printf("\n");

out_free:
        evt_num = evt_i;
        for (evt_i = 0; evt_i < evt_num; evt_i++)
                zfree(&evt_list[evt_i]);
        zfree(&evt_list);
        return;

out_close_evt_dir:
        closedir(evt_dir);
out_close_sys_dir:
        closedir(sys_dir);

        printf("FATAL: not enough memory to print %s\n",
                        event_type_descriptors[PERF_TYPE_TRACEPOINT]);
        if (evt_list)
                goto out_free;
}

/*
 * Check whether event is in <debugfs_mount_point>/tracing/events
 */

int is_valid_tracepoint(const char *event_string)
{
        DIR *sys_dir, *evt_dir;
        struct dirent *sys_dirent, *evt_dirent;
        char evt_path[MAXPATHLEN];
        char *dir_path;

        sys_dir = tracing_events__opendir();
        if (!sys_dir)
                return 0;

        for_each_subsystem(sys_dir, sys_dirent) {
                dir_path = get_events_file(sys_dirent->d_name);
                if (!dir_path)
                        continue;
                evt_dir = opendir(dir_path);
                if (!evt_dir)
                        goto next;

                for_each_event(dir_path, evt_dir, evt_dirent) {
                        snprintf(evt_path, MAXPATHLEN, "%s:%s",
                                 sys_dirent->d_name, evt_dirent->d_name);
                        if (!strcmp(evt_path, event_string)) {
                                closedir(evt_dir);
                                closedir(sys_dir);
                                return 1;
                        }
                }
                closedir(evt_dir);
next:
                put_events_file(dir_path);
        }
        closedir(sys_dir);
        return 0;
}

static bool is_event_supported(u8 type, unsigned config)
{
        bool ret = true;
        int open_return;
        struct evsel *evsel;
        struct perf_event_attr attr = {
                .type = type,
                .config = config,
                .disabled = 1,
        };
        struct perf_thread_map *tmap = thread_map__new_by_tid(0);

        if (tmap == NULL)
                return false;

        evsel = evsel__new(&attr);
        if (evsel) {
                open_return = evsel__open(evsel, NULL, tmap);
                ret = open_return >= 0;

                if (open_return == -EACCES) {
                        /*
                         * This happens if the paranoid value
                         * /proc/sys/kernel/perf_event_paranoid is set to 2
                         * Re-run with exclude_kernel set; we don't do that
                         * by default as some ARM machines do not support it.
                         *
                         */
                        evsel->core.attr.exclude_kernel = 1;
                        ret = evsel__open(evsel, NULL, tmap) >= 0;
                }
                evsel__delete(evsel);
        }

        perf_thread_map__put(tmap);
        return ret;
}

void print_sdt_events(const char *subsys_glob, const char *event_glob,
                      bool name_only)
{
        struct probe_cache *pcache;
        struct probe_cache_entry *ent;
        struct strlist *bidlist, *sdtlist;
        struct strlist_config cfg = {.dont_dupstr = true};
        struct str_node *nd, *nd2;
        char *buf, *path, *ptr = NULL;
        bool show_detail = false;
        int ret;

        sdtlist = strlist__new(NULL, &cfg);
        if (!sdtlist) {
                pr_debug("Failed to allocate new strlist for SDT\n");
                return;
        }
        bidlist = build_id_cache__list_all(true);
        if (!bidlist) {
                pr_debug("Failed to get buildids: %d\n", errno);
                return;
        }
        strlist__for_each_entry(nd, bidlist) {
                pcache = probe_cache__new(nd->s, NULL);
                if (!pcache)
                        continue;
                list_for_each_entry(ent, &pcache->entries, node) {
                        if (!ent->sdt)
                                continue;
                        if (subsys_glob &&
                            !strglobmatch(ent->pev.group, subsys_glob))
                                continue;
                        if (event_glob &&
                            !strglobmatch(ent->pev.event, event_glob))
                                continue;
                        ret = asprintf(&buf, "%s:%s@%s", ent->pev.group,
                                        ent->pev.event, nd->s);
                        if (ret > 0)
                                strlist__add(sdtlist, buf);
                }
                probe_cache__delete(pcache);
        }
        strlist__delete(bidlist);

        strlist__for_each_entry(nd, sdtlist) {
                buf = strchr(nd->s, '@');
                if (buf)
                        *(buf++) = '\0';
                if (name_only) {
                        printf("%s ", nd->s);
                        continue;
                }
                nd2 = strlist__next(nd);
                if (nd2) {
                        ptr = strchr(nd2->s, '@');
                        if (ptr)
                                *ptr = '\0';
                        if (strcmp(nd->s, nd2->s) == 0)
                                show_detail = true;
                }
                if (show_detail) {
                        path = build_id_cache__origname(buf);
                        ret = asprintf(&buf, "%s@%s(%.12s)", nd->s, path, buf);
                        if (ret > 0) {
                                printf("  %-50s [%s]\n", buf, "SDT event");
                                free(buf);
                        }
                        free(path);
                } else
                        printf("  %-50s [%s]\n", nd->s, "SDT event");
                if (nd2) {
                        if (strcmp(nd->s, nd2->s) != 0)
                                show_detail = false;
                        if (ptr)
                                *ptr = '@';
                }
        }
        strlist__delete(sdtlist);
}

int print_hwcache_events(const char *event_glob, bool name_only)
{
        unsigned int type, op, i, evt_i = 0, evt_num = 0;
        char name[64];
        char **evt_list = NULL;
        bool evt_num_known = false;

restart:
        if (evt_num_known) {
                evt_list = zalloc(sizeof(char *) * evt_num);
                if (!evt_list)
                        goto out_enomem;
        }

        for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
                for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
                        /* skip invalid cache type */
                        if (!evsel__is_cache_op_valid(type, op))
                                continue;

                        for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
                                __evsel__hw_cache_type_op_res_name(type, op, i, name, sizeof(name));
                                if (event_glob != NULL && !strglobmatch(name, event_glob))
                                        continue;

                                if (!is_event_supported(PERF_TYPE_HW_CACHE,
                                                        type | (op << 8) | (i << 16)))
                                        continue;

                                if (!evt_num_known) {
                                        evt_num++;
                                        continue;
                                }

                                evt_list[evt_i] = strdup(name);
                                if (evt_list[evt_i] == NULL)
                                        goto out_enomem;
                                evt_i++;
                        }
                }
        }

        if (!evt_num_known) {
                evt_num_known = true;
                goto restart;
        }
        qsort(evt_list, evt_num, sizeof(char *), cmp_string);
        evt_i = 0;
        while (evt_i < evt_num) {
                if (name_only) {
                        printf("%s ", evt_list[evt_i++]);
                        continue;
                }
                printf("  %-50s [%s]\n", evt_list[evt_i++],
                                event_type_descriptors[PERF_TYPE_HW_CACHE]);
        }
        if (evt_num && pager_in_use())
                printf("\n");

out_free:
        evt_num = evt_i;
        for (evt_i = 0; evt_i < evt_num; evt_i++)
                zfree(&evt_list[evt_i]);
        zfree(&evt_list);
        return evt_num;

out_enomem:
        printf("FATAL: not enough memory to print %s\n", event_type_descriptors[PERF_TYPE_HW_CACHE]);
        if (evt_list)
                goto out_free;
        return evt_num;
}

static void print_tool_event(const char *name, const char *event_glob,
                             bool name_only)
{
        if (event_glob && !strglobmatch(name, event_glob))
                return;
        if (name_only)
                printf("%s ", name);
        else
                printf("  %-50s [%s]\n", name, "Tool event");

}

void print_tool_events(const char *event_glob, bool name_only)
{
        print_tool_event("duration_time", event_glob, name_only);
        if (pager_in_use())
                printf("\n");
}

void print_symbol_events(const char *event_glob, unsigned type,
                                struct event_symbol *syms, unsigned max,
                                bool name_only)
{
        unsigned int i, evt_i = 0, evt_num = 0;
        char name[MAX_NAME_LEN];
        char **evt_list = NULL;
        bool evt_num_known = false;

restart:
        if (evt_num_known) {
                evt_list = zalloc(sizeof(char *) * evt_num);
                if (!evt_list)
                        goto out_enomem;
                syms -= max;
        }

        for (i = 0; i < max; i++, syms++) {

                if (event_glob != NULL && syms->symbol != NULL &&
                    !(strglobmatch(syms->symbol, event_glob) ||
                      (syms->alias && strglobmatch(syms->alias, event_glob))))
                        continue;

                if (!is_event_supported(type, i))
                        continue;

                if (!evt_num_known) {
                        evt_num++;
                        continue;
                }

                if (!name_only && strlen(syms->alias))
                        snprintf(name, MAX_NAME_LEN, "%s OR %s", syms->symbol, syms->alias);
                else
                        strlcpy(name, syms->symbol, MAX_NAME_LEN);

                evt_list[evt_i] = strdup(name);
                if (evt_list[evt_i] == NULL)
                        goto out_enomem;
                evt_i++;
        }

        if (!evt_num_known) {
                evt_num_known = true;
                goto restart;
        }
        qsort(evt_list, evt_num, sizeof(char *), cmp_string);
        evt_i = 0;
        while (evt_i < evt_num) {
                if (name_only) {
                        printf("%s ", evt_list[evt_i++]);
                        continue;
                }
                printf("  %-50s [%s]\n", evt_list[evt_i++], event_type_descriptors[type]);
        }
        if (evt_num && pager_in_use())
                printf("\n");

out_free:
        evt_num = evt_i;
        for (evt_i = 0; evt_i < evt_num; evt_i++)
                zfree(&evt_list[evt_i]);
        zfree(&evt_list);
        return;

out_enomem:
        printf("FATAL: not enough memory to print %s\n", event_type_descriptors[type]);
        if (evt_list)
                goto out_free;
}

/*
 * Print the help text for the event symbols:
 */
void print_events(const char *event_glob, bool name_only, bool quiet_flag,
                        bool long_desc, bool details_flag, bool deprecated)
{
        print_symbol_events(event_glob, PERF_TYPE_HARDWARE,
                            event_symbols_hw, PERF_COUNT_HW_MAX, name_only);

        print_symbol_events(event_glob, PERF_TYPE_SOFTWARE,
                            event_symbols_sw, PERF_COUNT_SW_MAX, name_only);
        print_tool_events(event_glob, name_only);

        print_hwcache_events(event_glob, name_only);

        print_pmu_events(event_glob, name_only, quiet_flag, long_desc,
                        details_flag, deprecated);

        if (event_glob != NULL)
                return;

        if (!name_only) {
                printf("  %-50s [%s]\n",
                       "rNNN",
                       event_type_descriptors[PERF_TYPE_RAW]);
                printf("  %-50s [%s]\n",
                       "cpu/t1=v1[,t2=v2,t3 ...]/modifier",
                       event_type_descriptors[PERF_TYPE_RAW]);
                if (pager_in_use())
                        printf("   (see 'man perf-list' on how to encode it)\n\n");

                printf("  %-50s [%s]\n",
                       "mem:<addr>[/len][:access]",
                        event_type_descriptors[PERF_TYPE_BREAKPOINT]);
                if (pager_in_use())
                        printf("\n");
        }

        print_tracepoint_events(NULL, NULL, name_only);

        print_sdt_events(NULL, NULL, name_only);

        metricgroup__print(true, true, NULL, name_only, details_flag);

        print_libpfm_events(name_only, long_desc);
}

int parse_events__is_hardcoded_term(struct parse_events_term *term)
{
        return term->type_term != PARSE_EVENTS__TERM_TYPE_USER;
}

static int new_term(struct parse_events_term **_term,
                    struct parse_events_term *temp,
                    char *str, u64 num)
{
        struct parse_events_term *term;

        term = malloc(sizeof(*term));
        if (!term)
                return -ENOMEM;

        *term = *temp;
        INIT_LIST_HEAD(&term->list);
        term->weak = false;

        switch (term->type_val) {
        case PARSE_EVENTS__TERM_TYPE_NUM:
                term->val.num = num;
                break;
        case PARSE_EVENTS__TERM_TYPE_STR:
                term->val.str = str;
                break;
        default:
                free(term);
                return -EINVAL;
        }

        *_term = term;
        return 0;
}

int parse_events_term__num(struct parse_events_term **term,
                           int type_term, char *config, u64 num,
                           bool no_value,
                           void *loc_term_, void *loc_val_)
{
        YYLTYPE *loc_term = loc_term_;
        YYLTYPE *loc_val = loc_val_;

        struct parse_events_term temp = {
                .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
                .type_term = type_term,
                .config    = config,
                .no_value  = no_value,
                .err_term  = loc_term ? loc_term->first_column : 0,
                .err_val   = loc_val  ? loc_val->first_column  : 0,
        };

        return new_term(term, &temp, NULL, num);
}

int parse_events_term__str(struct parse_events_term **term,
                           int type_term, char *config, char *str,
                           void *loc_term_, void *loc_val_)
{
        YYLTYPE *loc_term = loc_term_;
        YYLTYPE *loc_val = loc_val_;

        struct parse_events_term temp = {
                .type_val  = PARSE_EVENTS__TERM_TYPE_STR,
                .type_term = type_term,
                .config    = config,
                .err_term  = loc_term ? loc_term->first_column : 0,
                .err_val   = loc_val  ? loc_val->first_column  : 0,
        };

        return new_term(term, &temp, str, 0);
}

int parse_events_term__sym_hw(struct parse_events_term **term,
                              char *config, unsigned idx)
{
        struct event_symbol *sym;
        char *str;
        struct parse_events_term temp = {
                .type_val  = PARSE_EVENTS__TERM_TYPE_STR,
                .type_term = PARSE_EVENTS__TERM_TYPE_USER,
                .config    = config,
        };

        if (!temp.config) {
                temp.config = strdup("event");
                if (!temp.config)

                        return -ENOMEM;
        }
        BUG_ON(idx >= PERF_COUNT_HW_MAX);
        sym = &event_symbols_hw[idx];

        str = strdup(sym->symbol);
        if (!str)
                return -ENOMEM;
        return new_term(term, &temp, str, 0);
}

int parse_events_term__clone(struct parse_events_term **new,
                             struct parse_events_term *term)
{
        char *str;
        struct parse_events_term temp = {
                .type_val  = term->type_val,
                .type_term = term->type_term,
                .config    = NULL,
                .err_term  = term->err_term,
                .err_val   = term->err_val,
        };

        if (term->config) {
                temp.config = strdup(term->config);
                if (!temp.config)
                        return -ENOMEM;
        }
        if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
                return new_term(new, &temp, NULL, term->val.num);

        str = strdup(term->val.str);
        if (!str)
                return -ENOMEM;
        return new_term(new, &temp, str, 0);
}

void parse_events_term__delete(struct parse_events_term *term)
{
        if (term->array.nr_ranges)
                zfree(&term->array.ranges);

        if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
                zfree(&term->val.str);

        zfree(&term->config);
        free(term);
}

int parse_events_copy_term_list(struct list_head *old,
                                 struct list_head **new)
{
        struct parse_events_term *term, *n;
        int ret;

        if (!old) {
                *new = NULL;
                return 0;
        }

        *new = malloc(sizeof(struct list_head));
        if (!*new)
                return -ENOMEM;
        INIT_LIST_HEAD(*new);

        list_for_each_entry (term, old, list) {
                ret = parse_events_term__clone(&n, term);
                if (ret)
                        return ret;
                list_add_tail(&n->list, *new);
        }
        return 0;
}

void parse_events_terms__purge(struct list_head *terms)
{
        struct parse_events_term *term, *h;

        list_for_each_entry_safe(term, h, terms, list) {
                list_del_init(&term->list);
                parse_events_term__delete(term);
        }
}

void parse_events_terms__delete(struct list_head *terms)
{
        if (!terms)
                return;
        parse_events_terms__purge(terms);
        free(terms);
}

void parse_events__clear_array(struct parse_events_array *a)
{
        zfree(&a->ranges);
}

void parse_events_evlist_error(struct parse_events_state *parse_state,
                               int idx, const char *str)
{
        if (!parse_state->error)
                return;

        parse_events__handle_error(parse_state->error, idx, strdup(str), NULL);
}

static void config_terms_list(char *buf, size_t buf_sz)
{
        int i;
        bool first = true;

        buf[0] = '\0';
        for (i = 0; i < __PARSE_EVENTS__TERM_TYPE_NR; i++) {
                const char *name = config_term_names[i];

                if (!config_term_avail(i, NULL))
                        continue;
                if (!name)
                        continue;
                if (name[0] == '<')
                        continue;

                if (strlen(buf) + strlen(name) + 2 >= buf_sz)
                        return;

                if (!first)
                        strcat(buf, ",");
                else
                        first = false;
                strcat(buf, name);
        }
}

/*
 * Return string contains valid config terms of an event.
 * @additional_terms: For terms such as PMU sysfs terms.
 */
char *parse_events_formats_error_string(char *additional_terms)
{
        char *str;
        /* "no-overwrite" is the longest name */
        char static_terms[__PARSE_EVENTS__TERM_TYPE_NR *
                          (sizeof("no-overwrite") - 1)];

        config_terms_list(static_terms, sizeof(static_terms));
        /* valid terms */
        if (additional_terms) {
                if (asprintf(&str, "valid terms: %s,%s",
                             additional_terms, static_terms) < 0)
                        goto fail;
        } else {
                if (asprintf(&str, "valid terms: %s", static_terms) < 0)
                        goto fail;
        }
        return str;

fail:
        return NULL;
}