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![Wang Nan](/assets/img/avatar_default.png)
This patch provides infrastructure for passing source files to --event directly using: # perf record --event bpf-file.c command This patch does following works: 1) Allow passing '.c' file to '--event'. parse_events_load_bpf() is expanded to allow caller tell it whether the passed file is source file or object. 2) llvm__compile_bpf() is called to compile the '.c' file, the result is saved into memory. Use bpf_object__open_buffer() to load the in-memory object. Introduces a bpf-script-example.c so we can manually test it: # perf record --clang-opt "-DLINUX_VERSION_CODE=0x40200" --event ./bpf-script-example.c sleep 1 Note that '--clang-opt' must put before '--event'. Futher patches will merge it into a testcase so can be tested automatically. Signed-off-by: Wang Nan <wangnan0@huawei.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David Ahern <dsahern@gmail.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kaixu Xia <xiakaixu@huawei.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1444826502-49291-10-git-send-email-wangnan0@huawei.com Signed-off-by: He Kuang <hekuang@huawei.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2107 lines
48 KiB
C
2107 lines
48 KiB
C
#include <linux/hw_breakpoint.h>
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#include <linux/err.h>
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#include "util.h"
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#include "../perf.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "parse-options.h"
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#include "parse-events.h"
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#include "exec_cmd.h"
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#include "string.h"
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#include "symbol.h"
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#include "cache.h"
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#include "header.h"
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#include "bpf-loader.h"
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#include "debug.h"
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#include <api/fs/tracing_path.h>
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#include "parse-events-bison.h"
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#define YY_EXTRA_TYPE int
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#include "parse-events-flex.h"
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#include "pmu.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "asm/bug.h"
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#define MAX_NAME_LEN 100
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#ifdef PARSER_DEBUG
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extern int parse_events_debug;
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#endif
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int parse_events_parse(void *data, void *scanner);
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static int get_config_terms(struct list_head *head_config,
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struct list_head *head_terms __maybe_unused);
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static struct perf_pmu_event_symbol *perf_pmu_events_list;
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/*
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* The variable indicates the number of supported pmu event symbols.
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* 0 means not initialized and ready to init
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* -1 means failed to init, don't try anymore
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* >0 is the number of supported pmu event symbols
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*/
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static int perf_pmu_events_list_num;
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struct event_symbol event_symbols_hw[PERF_COUNT_HW_MAX] = {
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[PERF_COUNT_HW_CPU_CYCLES] = {
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.symbol = "cpu-cycles",
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.alias = "cycles",
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},
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[PERF_COUNT_HW_INSTRUCTIONS] = {
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.symbol = "instructions",
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.alias = "",
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},
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[PERF_COUNT_HW_CACHE_REFERENCES] = {
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.symbol = "cache-references",
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.alias = "",
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},
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[PERF_COUNT_HW_CACHE_MISSES] = {
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.symbol = "cache-misses",
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.alias = "",
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},
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = {
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.symbol = "branch-instructions",
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.alias = "branches",
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},
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[PERF_COUNT_HW_BRANCH_MISSES] = {
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.symbol = "branch-misses",
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.alias = "",
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},
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[PERF_COUNT_HW_BUS_CYCLES] = {
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.symbol = "bus-cycles",
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.alias = "",
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},
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[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = {
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.symbol = "stalled-cycles-frontend",
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.alias = "idle-cycles-frontend",
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},
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[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = {
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.symbol = "stalled-cycles-backend",
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.alias = "idle-cycles-backend",
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},
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[PERF_COUNT_HW_REF_CPU_CYCLES] = {
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.symbol = "ref-cycles",
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.alias = "",
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},
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};
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struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = {
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[PERF_COUNT_SW_CPU_CLOCK] = {
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.symbol = "cpu-clock",
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.alias = "",
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},
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[PERF_COUNT_SW_TASK_CLOCK] = {
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.symbol = "task-clock",
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.alias = "",
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},
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[PERF_COUNT_SW_PAGE_FAULTS] = {
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.symbol = "page-faults",
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.alias = "faults",
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},
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[PERF_COUNT_SW_CONTEXT_SWITCHES] = {
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.symbol = "context-switches",
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.alias = "cs",
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},
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[PERF_COUNT_SW_CPU_MIGRATIONS] = {
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.symbol = "cpu-migrations",
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.alias = "migrations",
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},
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[PERF_COUNT_SW_PAGE_FAULTS_MIN] = {
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.symbol = "minor-faults",
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.alias = "",
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},
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[PERF_COUNT_SW_PAGE_FAULTS_MAJ] = {
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.symbol = "major-faults",
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.alias = "",
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},
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[PERF_COUNT_SW_ALIGNMENT_FAULTS] = {
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.symbol = "alignment-faults",
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.alias = "",
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},
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[PERF_COUNT_SW_EMULATION_FAULTS] = {
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.symbol = "emulation-faults",
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.alias = "",
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},
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[PERF_COUNT_SW_DUMMY] = {
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.symbol = "dummy",
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.alias = "",
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},
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};
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#define __PERF_EVENT_FIELD(config, name) \
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((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)
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#define PERF_EVENT_RAW(config) __PERF_EVENT_FIELD(config, RAW)
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#define PERF_EVENT_CONFIG(config) __PERF_EVENT_FIELD(config, CONFIG)
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#define PERF_EVENT_TYPE(config) __PERF_EVENT_FIELD(config, TYPE)
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#define PERF_EVENT_ID(config) __PERF_EVENT_FIELD(config, EVENT)
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#define for_each_subsystem(sys_dir, sys_dirent, sys_next) \
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while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next) \
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if (sys_dirent.d_type == DT_DIR && \
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(strcmp(sys_dirent.d_name, ".")) && \
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(strcmp(sys_dirent.d_name, "..")))
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static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
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{
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char evt_path[MAXPATHLEN];
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int fd;
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", tracing_events_path,
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sys_dir->d_name, evt_dir->d_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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return -EINVAL;
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close(fd);
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return 0;
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}
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#define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) \
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while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next) \
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if (evt_dirent.d_type == DT_DIR && \
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(strcmp(evt_dirent.d_name, ".")) && \
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(strcmp(evt_dirent.d_name, "..")) && \
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(!tp_event_has_id(&sys_dirent, &evt_dirent)))
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#define MAX_EVENT_LENGTH 512
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struct tracepoint_path *tracepoint_id_to_path(u64 config)
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{
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struct tracepoint_path *path = NULL;
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DIR *sys_dir, *evt_dir;
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struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
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char id_buf[24];
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int fd;
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u64 id;
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char evt_path[MAXPATHLEN];
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char dir_path[MAXPATHLEN];
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sys_dir = opendir(tracing_events_path);
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if (!sys_dir)
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return NULL;
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for_each_subsystem(sys_dir, sys_dirent, sys_next) {
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snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
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sys_dirent.d_name);
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evt_dir = opendir(dir_path);
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if (!evt_dir)
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continue;
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for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
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snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
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evt_dirent.d_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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continue;
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if (read(fd, id_buf, sizeof(id_buf)) < 0) {
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close(fd);
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continue;
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}
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close(fd);
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id = atoll(id_buf);
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if (id == config) {
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closedir(evt_dir);
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closedir(sys_dir);
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path = zalloc(sizeof(*path));
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path->system = malloc(MAX_EVENT_LENGTH);
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if (!path->system) {
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free(path);
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return NULL;
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}
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path->name = malloc(MAX_EVENT_LENGTH);
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if (!path->name) {
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zfree(&path->system);
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free(path);
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return NULL;
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}
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strncpy(path->system, sys_dirent.d_name,
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MAX_EVENT_LENGTH);
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strncpy(path->name, evt_dirent.d_name,
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MAX_EVENT_LENGTH);
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return path;
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}
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}
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closedir(evt_dir);
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}
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closedir(sys_dir);
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return NULL;
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}
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struct tracepoint_path *tracepoint_name_to_path(const char *name)
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{
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struct tracepoint_path *path = zalloc(sizeof(*path));
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char *str = strchr(name, ':');
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if (path == NULL || str == NULL) {
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free(path);
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return NULL;
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}
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path->system = strndup(name, str - name);
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path->name = strdup(str+1);
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if (path->system == NULL || path->name == NULL) {
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zfree(&path->system);
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zfree(&path->name);
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free(path);
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path = NULL;
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}
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return path;
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}
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const char *event_type(int type)
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{
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switch (type) {
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case PERF_TYPE_HARDWARE:
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return "hardware";
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case PERF_TYPE_SOFTWARE:
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return "software";
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case PERF_TYPE_TRACEPOINT:
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return "tracepoint";
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case PERF_TYPE_HW_CACHE:
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return "hardware-cache";
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default:
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break;
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}
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return "unknown";
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}
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static struct perf_evsel *
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__add_event(struct list_head *list, int *idx,
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struct perf_event_attr *attr,
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char *name, struct cpu_map *cpus,
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struct list_head *config_terms)
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{
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struct perf_evsel *evsel;
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event_attr_init(attr);
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evsel = perf_evsel__new_idx(attr, (*idx)++);
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if (!evsel)
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return NULL;
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evsel->cpus = cpu_map__get(cpus);
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evsel->own_cpus = cpu_map__get(cpus);
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if (name)
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evsel->name = strdup(name);
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if (config_terms)
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list_splice(config_terms, &evsel->config_terms);
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list_add_tail(&evsel->node, list);
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return evsel;
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}
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static int add_event(struct list_head *list, int *idx,
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struct perf_event_attr *attr, char *name,
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struct list_head *config_terms)
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{
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return __add_event(list, idx, attr, name, NULL, config_terms) ? 0 : -ENOMEM;
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}
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static int parse_aliases(char *str, const char *names[][PERF_EVSEL__MAX_ALIASES], int size)
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{
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int i, j;
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int n, longest = -1;
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for (i = 0; i < size; i++) {
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for (j = 0; j < PERF_EVSEL__MAX_ALIASES && names[i][j]; j++) {
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n = strlen(names[i][j]);
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if (n > longest && !strncasecmp(str, names[i][j], n))
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longest = n;
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}
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if (longest > 0)
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return i;
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}
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return -1;
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}
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int parse_events_add_cache(struct list_head *list, int *idx,
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char *type, char *op_result1, char *op_result2)
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{
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struct perf_event_attr attr;
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char name[MAX_NAME_LEN];
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int cache_type = -1, cache_op = -1, cache_result = -1;
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char *op_result[2] = { op_result1, op_result2 };
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int i, n;
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/*
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* No fallback - if we cannot get a clear cache type
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* then bail out:
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*/
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cache_type = parse_aliases(type, perf_evsel__hw_cache,
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PERF_COUNT_HW_CACHE_MAX);
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if (cache_type == -1)
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return -EINVAL;
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n = snprintf(name, MAX_NAME_LEN, "%s", type);
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for (i = 0; (i < 2) && (op_result[i]); i++) {
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char *str = op_result[i];
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n += snprintf(name + n, MAX_NAME_LEN - n, "-%s", str);
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if (cache_op == -1) {
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cache_op = parse_aliases(str, perf_evsel__hw_cache_op,
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PERF_COUNT_HW_CACHE_OP_MAX);
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if (cache_op >= 0) {
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if (!perf_evsel__is_cache_op_valid(cache_type, cache_op))
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return -EINVAL;
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continue;
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}
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}
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if (cache_result == -1) {
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cache_result = parse_aliases(str, perf_evsel__hw_cache_result,
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PERF_COUNT_HW_CACHE_RESULT_MAX);
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if (cache_result >= 0)
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continue;
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}
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}
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/*
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* Fall back to reads:
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*/
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if (cache_op == -1)
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cache_op = PERF_COUNT_HW_CACHE_OP_READ;
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/*
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* Fall back to accesses:
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*/
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if (cache_result == -1)
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cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
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memset(&attr, 0, sizeof(attr));
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attr.config = cache_type | (cache_op << 8) | (cache_result << 16);
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attr.type = PERF_TYPE_HW_CACHE;
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return add_event(list, idx, &attr, name, NULL);
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}
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static void tracepoint_error(struct parse_events_error *e, int err,
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char *sys, char *name)
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{
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char help[BUFSIZ];
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/*
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* We get error directly from syscall errno ( > 0),
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* or from encoded pointer's error ( < 0).
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*/
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err = abs(err);
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switch (err) {
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case EACCES:
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e->str = strdup("can't access trace events");
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break;
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case ENOENT:
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e->str = strdup("unknown tracepoint");
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break;
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default:
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e->str = strdup("failed to add tracepoint");
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break;
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}
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tracing_path__strerror_open_tp(err, help, sizeof(help), sys, name);
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e->help = strdup(help);
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}
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static int add_tracepoint(struct list_head *list, int *idx,
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char *sys_name, char *evt_name,
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struct parse_events_error *err,
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struct list_head *head_config)
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{
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struct perf_evsel *evsel;
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evsel = perf_evsel__newtp_idx(sys_name, evt_name, (*idx)++);
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if (IS_ERR(evsel)) {
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tracepoint_error(err, PTR_ERR(evsel), sys_name, evt_name);
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return PTR_ERR(evsel);
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}
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if (head_config) {
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LIST_HEAD(config_terms);
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if (get_config_terms(head_config, &config_terms))
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return -ENOMEM;
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list_splice(&config_terms, &evsel->config_terms);
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}
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list_add_tail(&evsel->node, list);
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return 0;
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}
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static int add_tracepoint_multi_event(struct list_head *list, int *idx,
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char *sys_name, char *evt_name,
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struct parse_events_error *err,
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struct list_head *head_config)
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{
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char evt_path[MAXPATHLEN];
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struct dirent *evt_ent;
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DIR *evt_dir;
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int ret = 0, found = 0;
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snprintf(evt_path, MAXPATHLEN, "%s/%s", tracing_events_path, sys_name);
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evt_dir = opendir(evt_path);
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if (!evt_dir) {
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tracepoint_error(err, errno, sys_name, evt_name);
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return -1;
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}
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while (!ret && (evt_ent = readdir(evt_dir))) {
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if (!strcmp(evt_ent->d_name, ".")
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|| !strcmp(evt_ent->d_name, "..")
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|| !strcmp(evt_ent->d_name, "enable")
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|| !strcmp(evt_ent->d_name, "filter"))
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continue;
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if (!strglobmatch(evt_ent->d_name, evt_name))
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continue;
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found++;
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ret = add_tracepoint(list, idx, sys_name, evt_ent->d_name,
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err, head_config);
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}
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if (!found) {
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tracepoint_error(err, ENOENT, sys_name, evt_name);
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ret = -1;
|
|
}
|
|
|
|
closedir(evt_dir);
|
|
return ret;
|
|
}
|
|
|
|
static int add_tracepoint_event(struct list_head *list, int *idx,
|
|
char *sys_name, 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,
|
|
char *sys_name, 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 = opendir(tracing_events_path);
|
|
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_evlist *data;
|
|
struct list_head *list;
|
|
};
|
|
|
|
static int add_bpf_event(struct probe_trace_event *tev, int fd,
|
|
void *_param)
|
|
{
|
|
LIST_HEAD(new_evsels);
|
|
struct __add_bpf_event_param *param = _param;
|
|
struct parse_events_evlist *evlist = param->data;
|
|
struct list_head *list = param->list;
|
|
struct perf_evsel *pos;
|
|
int err;
|
|
|
|
pr_debug("add bpf event %s:%s and attach bpf program %d\n",
|
|
tev->group, tev->event, fd);
|
|
|
|
err = parse_events_add_tracepoint(&new_evsels, &evlist->idx, tev->group,
|
|
tev->event, evlist->error, NULL);
|
|
if (err) {
|
|
struct perf_evsel *evsel, *tmp;
|
|
|
|
pr_debug("Failed to add BPF event %s:%s\n",
|
|
tev->group, tev->event);
|
|
list_for_each_entry_safe(evsel, tmp, &new_evsels, node) {
|
|
list_del(&evsel->node);
|
|
perf_evsel__delete(evsel);
|
|
}
|
|
return err;
|
|
}
|
|
pr_debug("adding %s:%s\n", tev->group, tev->event);
|
|
|
|
list_for_each_entry(pos, &new_evsels, node) {
|
|
pr_debug("adding %s:%s to %p\n",
|
|
tev->group, tev->event, pos);
|
|
pos->bpf_fd = fd;
|
|
}
|
|
list_splice(&new_evsels, list);
|
|
return 0;
|
|
}
|
|
|
|
int parse_events_load_bpf_obj(struct parse_events_evlist *data,
|
|
struct list_head *list,
|
|
struct bpf_object *obj)
|
|
{
|
|
int err;
|
|
char errbuf[BUFSIZ];
|
|
struct __add_bpf_event_param param = {data, list};
|
|
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_tev(obj, add_bpf_event, ¶m);
|
|
if (err) {
|
|
snprintf(errbuf, sizeof(errbuf),
|
|
"Attach events in BPF object failed");
|
|
goto errout;
|
|
}
|
|
|
|
return 0;
|
|
errout:
|
|
data->error->help = strdup("(add -v to see detail)");
|
|
data->error->str = strdup(errbuf);
|
|
return err;
|
|
}
|
|
|
|
int parse_events_load_bpf(struct parse_events_evlist *data,
|
|
struct list_head *list,
|
|
char *bpf_file_name,
|
|
bool source)
|
|
{
|
|
struct bpf_object *obj;
|
|
|
|
obj = bpf__prepare_load(bpf_file_name, source);
|
|
if (IS_ERR(obj) || !obj) {
|
|
char errbuf[BUFSIZ];
|
|
int err;
|
|
|
|
err = obj ? PTR_ERR(obj) : -EINVAL;
|
|
|
|
if (err == -ENOTSUP)
|
|
snprintf(errbuf, sizeof(errbuf),
|
|
"BPF support is not compiled");
|
|
else
|
|
snprintf(errbuf, sizeof(errbuf),
|
|
"BPF object file '%s' is invalid",
|
|
bpf_file_name);
|
|
|
|
data->error->help = strdup("(add -v to see detail)");
|
|
data->error->str = strdup(errbuf);
|
|
return err;
|
|
}
|
|
|
|
return parse_events_load_bpf_obj(data, list, obj);
|
|
}
|
|
|
|
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,
|
|
void *ptr, char *type, u64 len)
|
|
{
|
|
struct perf_event_attr attr;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.bp_addr = (unsigned long) ptr;
|
|
|
|
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) {
|
|
err->idx = term->err_val;
|
|
if (type == PARSE_EVENTS__TERM_TYPE_NUM)
|
|
err->str = strdup("expected numeric value");
|
|
else
|
|
err->str = strdup("expected string value");
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
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)
|
|
{
|
|
#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:
|
|
/*
|
|
* TODO uncomment when the field is available
|
|
* attr->branch_sample_type = term->val.num;
|
|
*/
|
|
break;
|
|
case PARSE_EVENTS__TERM_TYPE_TIME:
|
|
CHECK_TYPE_VAL(NUM);
|
|
if (term->val.num > 1) {
|
|
err->str = strdup("expected 0 or 1");
|
|
err->idx = term->err_val;
|
|
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_NAME:
|
|
CHECK_TYPE_VAL(STR);
|
|
break;
|
|
default:
|
|
err->str = strdup("unknown term");
|
|
err->idx = term->err_term;
|
|
err->help = parse_events_formats_error_string(NULL);
|
|
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)
|
|
/*
|
|
* 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:
|
|
return config_term_common(attr, term, err);
|
|
default:
|
|
if (err) {
|
|
err->idx = term->err_term;
|
|
err->str = strdup("unknown term");
|
|
err->help = 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, __name, __val) \
|
|
do { \
|
|
struct perf_evsel_config_term *__t; \
|
|
\
|
|
__t = zalloc(sizeof(*__t)); \
|
|
if (!__t) \
|
|
return -ENOMEM; \
|
|
\
|
|
INIT_LIST_HEAD(&__t->list); \
|
|
__t->type = PERF_EVSEL__CONFIG_TERM_ ## __type; \
|
|
__t->val.__name = __val; \
|
|
list_add_tail(&__t->list, head_terms); \
|
|
} 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(PERIOD, period, term->val.num);
|
|
break;
|
|
case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
|
|
ADD_CONFIG_TERM(FREQ, freq, term->val.num);
|
|
break;
|
|
case PARSE_EVENTS__TERM_TYPE_TIME:
|
|
ADD_CONFIG_TERM(TIME, time, term->val.num);
|
|
break;
|
|
case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
|
|
ADD_CONFIG_TERM(CALLGRAPH, callgraph, term->val.str);
|
|
break;
|
|
case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
|
|
ADD_CONFIG_TERM(STACK_USER, stack_user, term->val.num);
|
|
break;
|
|
case PARSE_EVENTS__TERM_TYPE_INHERIT:
|
|
ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 1 : 0);
|
|
break;
|
|
case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
|
|
ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 0 : 1);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
#undef ADD_EVSEL_CONFIG
|
|
return 0;
|
|
}
|
|
|
|
int parse_events_add_tracepoint(struct list_head *list, int *idx,
|
|
char *sys, 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_evlist *data,
|
|
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, data->error,
|
|
config_term_common))
|
|
return -EINVAL;
|
|
|
|
if (get_config_terms(head_config, &config_terms))
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return add_event(list, &data->idx, &attr, NULL, &config_terms);
|
|
}
|
|
|
|
static int parse_events__is_name_term(struct parse_events_term *term)
|
|
{
|
|
return term->type_term == PARSE_EVENTS__TERM_TYPE_NAME;
|
|
}
|
|
|
|
static char *pmu_event_name(struct list_head *head_terms)
|
|
{
|
|
struct parse_events_term *term;
|
|
|
|
list_for_each_entry(term, head_terms, list)
|
|
if (parse_events__is_name_term(term))
|
|
return term->val.str;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int parse_events_add_pmu(struct parse_events_evlist *data,
|
|
struct list_head *list, char *name,
|
|
struct list_head *head_config)
|
|
{
|
|
struct perf_event_attr attr;
|
|
struct perf_pmu_info info;
|
|
struct perf_pmu *pmu;
|
|
struct perf_evsel *evsel;
|
|
LIST_HEAD(config_terms);
|
|
|
|
pmu = perf_pmu__find(name);
|
|
if (!pmu)
|
|
return -EINVAL;
|
|
|
|
if (pmu->default_config) {
|
|
memcpy(&attr, pmu->default_config,
|
|
sizeof(struct perf_event_attr));
|
|
} else {
|
|
memset(&attr, 0, sizeof(attr));
|
|
}
|
|
|
|
if (!head_config) {
|
|
attr.type = pmu->type;
|
|
evsel = __add_event(list, &data->idx, &attr, NULL, pmu->cpus, NULL);
|
|
return evsel ? 0 : -ENOMEM;
|
|
}
|
|
|
|
if (perf_pmu__check_alias(pmu, head_config, &info))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Configure hardcoded terms first, no need to check
|
|
* return value when called with fail == 0 ;)
|
|
*/
|
|
if (config_attr(&attr, head_config, data->error, config_term_pmu))
|
|
return -EINVAL;
|
|
|
|
if (get_config_terms(head_config, &config_terms))
|
|
return -ENOMEM;
|
|
|
|
if (perf_pmu__config(pmu, &attr, head_config, data->error))
|
|
return -EINVAL;
|
|
|
|
evsel = __add_event(list, &data->idx, &attr,
|
|
pmu_event_name(head_config), pmu->cpus,
|
|
&config_terms);
|
|
if (evsel) {
|
|
evsel->unit = info.unit;
|
|
evsel->scale = info.scale;
|
|
evsel->per_pkg = info.per_pkg;
|
|
evsel->snapshot = info.snapshot;
|
|
}
|
|
|
|
return evsel ? 0 : -ENOMEM;
|
|
}
|
|
|
|
int parse_events__modifier_group(struct list_head *list,
|
|
char *event_mod)
|
|
{
|
|
return parse_events__modifier_event(list, event_mod, true);
|
|
}
|
|
|
|
void parse_events__set_leader(char *name, struct list_head *list)
|
|
{
|
|
struct perf_evsel *leader;
|
|
|
|
if (list_empty(list)) {
|
|
WARN_ONCE(true, "WARNING: failed to set leader: empty list");
|
|
return;
|
|
}
|
|
|
|
__perf_evlist__set_leader(list);
|
|
leader = list_entry(list->next, struct perf_evsel, 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;
|
|
};
|
|
|
|
static int get_event_modifier(struct event_modifier *mod, char *str,
|
|
struct perf_evsel *evsel)
|
|
{
|
|
int eu = evsel ? evsel->attr.exclude_user : 0;
|
|
int ek = evsel ? evsel->attr.exclude_kernel : 0;
|
|
int eh = evsel ? evsel->attr.exclude_hv : 0;
|
|
int eH = evsel ? evsel->attr.exclude_host : 0;
|
|
int eG = evsel ? evsel->attr.exclude_guest : 0;
|
|
int eI = evsel ? evsel->attr.exclude_idle : 0;
|
|
int precise = evsel ? evsel->attr.precise_ip : 0;
|
|
int precise_max = 0;
|
|
int sample_read = 0;
|
|
int pinned = evsel ? evsel->attr.pinned : 0;
|
|
|
|
int exclude = eu | ek | eh;
|
|
int exclude_GH = evsel ? evsel->exclude_GH : 0;
|
|
|
|
memset(mod, 0, sizeof(*mod));
|
|
|
|
while (*str) {
|
|
if (*str == 'u') {
|
|
if (!exclude)
|
|
exclude = eu = ek = eh = 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
|
|
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;
|
|
|
|
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("ukhGHpppPSDI") - 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 perf_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(list, evsel) {
|
|
if (add && get_event_modifier(&mod, str, evsel))
|
|
return -EINVAL;
|
|
|
|
evsel->attr.exclude_user = mod.eu;
|
|
evsel->attr.exclude_kernel = mod.ek;
|
|
evsel->attr.exclude_hv = mod.eh;
|
|
evsel->attr.precise_ip = mod.precise;
|
|
evsel->attr.exclude_host = mod.eH;
|
|
evsel->attr.exclude_guest = mod.eG;
|
|
evsel->attr.exclude_idle = mod.eI;
|
|
evsel->exclude_GH = mod.exclude_GH;
|
|
evsel->sample_read = mod.sample_read;
|
|
evsel->precise_max = mod.precise_max;
|
|
|
|
if (perf_evsel__is_group_leader(evsel))
|
|
evsel->attr.pinned = mod.pinned;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int parse_events_name(struct list_head *list, char *name)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
__evlist__for_each(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 strcmp(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;
|
|
free(p->symbol);
|
|
}
|
|
free(perf_pmu_events_list);
|
|
perf_pmu_events_list = NULL;
|
|
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 = perf_pmu__find("cpu");
|
|
if ((pmu == NULL) || list_empty(&pmu->aliases)) {
|
|
perf_pmu_events_list_num = -1;
|
|
return;
|
|
}
|
|
list_for_each_entry(alias, &pmu->aliases, list) {
|
|
if (strchr(alias->name, '-'))
|
|
len++;
|
|
len++;
|
|
}
|
|
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;
|
|
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();
|
|
}
|
|
|
|
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);
|
|
free(p.symbol);
|
|
return r ? r->type : PMU_EVENT_SYMBOL_ERR;
|
|
}
|
|
|
|
static int parse_events__scanner(const char *str, void *data, int start_token)
|
|
{
|
|
YY_BUFFER_STATE buffer;
|
|
void *scanner;
|
|
int ret;
|
|
|
|
ret = parse_events_lex_init_extra(start_token, &scanner);
|
|
if (ret)
|
|
return ret;
|
|
|
|
buffer = parse_events__scan_string(str, scanner);
|
|
|
|
#ifdef PARSER_DEBUG
|
|
parse_events_debug = 1;
|
|
#endif
|
|
ret = parse_events_parse(data, 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_terms data = {
|
|
.terms = NULL,
|
|
};
|
|
int ret;
|
|
|
|
ret = parse_events__scanner(str, &data, PE_START_TERMS);
|
|
if (!ret) {
|
|
list_splice(data.terms, terms);
|
|
zfree(&data.terms);
|
|
return 0;
|
|
}
|
|
|
|
if (data.terms)
|
|
parse_events__free_terms(data.terms);
|
|
return ret;
|
|
}
|
|
|
|
int parse_events(struct perf_evlist *evlist, const char *str,
|
|
struct parse_events_error *err)
|
|
{
|
|
struct parse_events_evlist data = {
|
|
.list = LIST_HEAD_INIT(data.list),
|
|
.idx = evlist->nr_entries,
|
|
.error = err,
|
|
};
|
|
int ret;
|
|
|
|
ret = parse_events__scanner(str, &data, PE_START_EVENTS);
|
|
perf_pmu__parse_cleanup();
|
|
if (!ret) {
|
|
struct perf_evsel *last;
|
|
|
|
if (list_empty(&data.list)) {
|
|
WARN_ONCE(true, "WARNING: event parser found nothing");
|
|
return -1;
|
|
}
|
|
|
|
perf_evlist__splice_list_tail(evlist, &data.list);
|
|
evlist->nr_groups += data.nr_groups;
|
|
last = perf_evlist__last(evlist);
|
|
last->cmdline_group_boundary = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* There are 2 users - builtin-record and builtin-test objects.
|
|
* Both call perf_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(struct parse_events_error *err,
|
|
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 beggining. */
|
|
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);
|
|
free(err->str);
|
|
free(err->help);
|
|
}
|
|
|
|
fprintf(stderr, "Run 'perf list' for a list of valid events\n");
|
|
}
|
|
|
|
#undef MAX_WIDTH
|
|
|
|
int parse_events_option(const struct option *opt, const char *str,
|
|
int unset __maybe_unused)
|
|
{
|
|
struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
|
|
struct parse_events_error err = { .idx = 0, };
|
|
int ret = parse_events(evlist, str, &err);
|
|
|
|
if (ret)
|
|
parse_events_print_error(&err, str);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
foreach_evsel_in_last_glob(struct perf_evlist *evlist,
|
|
int (*func)(struct perf_evsel *evsel,
|
|
const void *arg),
|
|
const void *arg)
|
|
{
|
|
struct perf_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->nr_entries > 0)
|
|
last = perf_evlist__last(evlist);
|
|
|
|
do {
|
|
err = (*func)(last, arg);
|
|
if (err)
|
|
return -1;
|
|
if (!last)
|
|
return 0;
|
|
|
|
if (last->node.prev == &evlist->entries)
|
|
return 0;
|
|
last = list_entry(last->node.prev, struct perf_evsel, node);
|
|
} while (!last->cmdline_group_boundary);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_filter(struct perf_evsel *evsel, const void *arg)
|
|
{
|
|
const char *str = arg;
|
|
|
|
if (evsel == NULL || evsel->attr.type != PERF_TYPE_TRACEPOINT) {
|
|
fprintf(stderr,
|
|
"--filter option should follow a -e tracepoint option\n");
|
|
return -1;
|
|
}
|
|
|
|
if (perf_evsel__append_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 perf_evlist *evlist = *(struct perf_evlist **)opt->value;
|
|
|
|
return foreach_evsel_in_last_glob(evlist, set_filter,
|
|
(const void *)str);
|
|
}
|
|
|
|
static int add_exclude_perf_filter(struct perf_evsel *evsel,
|
|
const void *arg __maybe_unused)
|
|
{
|
|
char new_filter[64];
|
|
|
|
if (evsel == NULL || evsel->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 (perf_evsel__append_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 perf_evlist *evlist = *(struct perf_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_next, *evt_next, sys_dirent, evt_dirent;
|
|
char evt_path[MAXPATHLEN];
|
|
char dir_path[MAXPATHLEN];
|
|
char **evt_list = NULL;
|
|
unsigned int evt_i = 0, evt_num = 0;
|
|
bool evt_num_known = false;
|
|
|
|
restart:
|
|
sys_dir = opendir(tracing_events_path);
|
|
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, sys_next) {
|
|
if (subsys_glob != NULL &&
|
|
!strglobmatch(sys_dirent.d_name, subsys_glob))
|
|
continue;
|
|
|
|
snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
|
|
sys_dirent.d_name);
|
|
evt_dir = opendir(dir_path);
|
|
if (!evt_dir)
|
|
continue;
|
|
|
|
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
|
|
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)
|
|
goto out_close_evt_dir;
|
|
evt_i++;
|
|
}
|
|
closedir(evt_dir);
|
|
}
|
|
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_next, *evt_next, sys_dirent, evt_dirent;
|
|
char evt_path[MAXPATHLEN];
|
|
char dir_path[MAXPATHLEN];
|
|
|
|
sys_dir = opendir(tracing_events_path);
|
|
if (!sys_dir)
|
|
return 0;
|
|
|
|
for_each_subsystem(sys_dir, sys_dirent, sys_next) {
|
|
|
|
snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
|
|
sys_dirent.d_name);
|
|
evt_dir = opendir(dir_path);
|
|
if (!evt_dir)
|
|
continue;
|
|
|
|
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
|
|
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);
|
|
}
|
|
closedir(sys_dir);
|
|
return 0;
|
|
}
|
|
|
|
static bool is_event_supported(u8 type, unsigned config)
|
|
{
|
|
bool ret = true;
|
|
int open_return;
|
|
struct perf_evsel *evsel;
|
|
struct perf_event_attr attr = {
|
|
.type = type,
|
|
.config = config,
|
|
.disabled = 1,
|
|
};
|
|
struct {
|
|
struct thread_map map;
|
|
int threads[1];
|
|
} tmap = {
|
|
.map.nr = 1,
|
|
.threads = { 0 },
|
|
};
|
|
|
|
evsel = perf_evsel__new(&attr);
|
|
if (evsel) {
|
|
open_return = perf_evsel__open(evsel, NULL, &tmap.map);
|
|
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->attr.exclude_kernel = 1;
|
|
ret = perf_evsel__open(evsel, NULL, &tmap.map) >= 0;
|
|
}
|
|
perf_evsel__delete(evsel);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
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 (!perf_evsel__is_cache_op_valid(type, op))
|
|
continue;
|
|
|
|
for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
|
|
__perf_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;
|
|
}
|
|
|
|
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 &&
|
|
!(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
|
|
strncpy(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)
|
|
{
|
|
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_hwcache_events(event_glob, name_only);
|
|
|
|
print_pmu_events(event_glob, name_only);
|
|
|
|
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);
|
|
}
|
|
|
|
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, int type_val,
|
|
int type_term, char *config,
|
|
char *str, u64 num, int err_term, int err_val)
|
|
{
|
|
struct parse_events_term *term;
|
|
|
|
term = zalloc(sizeof(*term));
|
|
if (!term)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&term->list);
|
|
term->type_val = type_val;
|
|
term->type_term = type_term;
|
|
term->config = config;
|
|
term->err_term = err_term;
|
|
term->err_val = err_val;
|
|
|
|
switch (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,
|
|
void *loc_term_, void *loc_val_)
|
|
{
|
|
YYLTYPE *loc_term = loc_term_;
|
|
YYLTYPE *loc_val = loc_val_;
|
|
|
|
return new_term(term, PARSE_EVENTS__TERM_TYPE_NUM, type_term,
|
|
config, NULL, num,
|
|
loc_term ? loc_term->first_column : 0,
|
|
loc_val ? loc_val->first_column : 0);
|
|
}
|
|
|
|
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_;
|
|
|
|
return new_term(term, PARSE_EVENTS__TERM_TYPE_STR, type_term,
|
|
config, str, 0,
|
|
loc_term ? loc_term->first_column : 0,
|
|
loc_val ? loc_val->first_column : 0);
|
|
}
|
|
|
|
int parse_events_term__sym_hw(struct parse_events_term **term,
|
|
char *config, unsigned idx)
|
|
{
|
|
struct event_symbol *sym;
|
|
|
|
BUG_ON(idx >= PERF_COUNT_HW_MAX);
|
|
sym = &event_symbols_hw[idx];
|
|
|
|
if (config)
|
|
return new_term(term, PARSE_EVENTS__TERM_TYPE_STR,
|
|
PARSE_EVENTS__TERM_TYPE_USER, config,
|
|
(char *) sym->symbol, 0, 0, 0);
|
|
else
|
|
return new_term(term, PARSE_EVENTS__TERM_TYPE_STR,
|
|
PARSE_EVENTS__TERM_TYPE_USER,
|
|
(char *) "event", (char *) sym->symbol,
|
|
0, 0, 0);
|
|
}
|
|
|
|
int parse_events_term__clone(struct parse_events_term **new,
|
|
struct parse_events_term *term)
|
|
{
|
|
return new_term(new, term->type_val, term->type_term, term->config,
|
|
term->val.str, term->val.num,
|
|
term->err_term, term->err_val);
|
|
}
|
|
|
|
void parse_events__free_terms(struct list_head *terms)
|
|
{
|
|
struct parse_events_term *term, *h;
|
|
|
|
list_for_each_entry_safe(term, h, terms, list)
|
|
free(term);
|
|
}
|
|
|
|
void parse_events_evlist_error(struct parse_events_evlist *data,
|
|
int idx, const char *str)
|
|
{
|
|
struct parse_events_error *err = data->error;
|
|
|
|
if (!err)
|
|
return;
|
|
err->idx = idx;
|
|
err->str = strdup(str);
|
|
WARN_ONCE(!err->str, "WARNING: failed to allocate error string");
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
static const char *static_terms = "config,config1,config2,name,"
|
|
"period,freq,branch_type,time,"
|
|
"call-graph,stack-size\n";
|
|
|
|
/* valid terms */
|
|
if (additional_terms) {
|
|
if (!asprintf(&str, "valid terms: %s,%s",
|
|
additional_terms, static_terms))
|
|
goto fail;
|
|
} else {
|
|
if (!asprintf(&str, "valid terms: %s", static_terms))
|
|
goto fail;
|
|
}
|
|
return str;
|
|
|
|
fail:
|
|
return NULL;
|
|
}
|