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Diffstat (limited to 'trace2.h')
| -rw-r--r-- | trace2.h | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/trace2.h b/trace2.h new file mode 100644 index 0000000000..f189ef5984 --- /dev/null +++ b/trace2.h @@ -0,0 +1,410 @@ +#ifndef TRACE2_H +#define TRACE2_H + +struct child_process; +struct repository; +struct json_writer; + +/* + * The public TRACE2 routines are grouped into the following groups: + * + * [] trace2_initialize -- initialization. + * [] trace2_cmd_* -- emit command/control messages. + * [] trace2_child* -- emit child start/stop messages. + * [] trace2_exec* -- emit exec start/stop messages. + * [] trace2_thread* -- emit thread start/stop messages. + * [] trace2_def* -- emit definition/parameter mesasges. + * [] trace2_region* -- emit region nesting messages. + * [] trace2_data* -- emit region/thread/repo data messages. + * [] trace2_printf* -- legacy trace[1] messages. + */ + +/* + * Initialize the TRACE2 clock and do nothing else, in particular + * no mallocs, no system inspection, and no environment inspection. + * + * This should be called at the very top of main() to capture the + * process start time. This is intended to reduce chicken-n-egg + * bootstrap pressure. + * + * It is safe to call this more than once. This allows capturing + * absolute startup costs on Windows which uses a little trickery + * to do setup work before common-main.c:main() is called. + * + * The main trace2_initialize_fl() may be called a little later + * after more infrastructure is established. + */ +void trace2_initialize_clock(void); + +/* + * Initialize TRACE2 tracing facility if any of the builtin TRACE2 + * targets are enabled in the system config or the environment. + * Emits a 'version' event. + * + * Cleanup/Termination is handled automatically by a registered + * atexit() routine. + */ +void trace2_initialize_fl(const char *file, int line); + +#define trace2_initialize() trace2_initialize_fl(__FILE__, __LINE__) + +/* + * Return true if trace2 is enabled. + */ +int trace2_is_enabled(void); + +/* + * Emit a 'start' event with the original (unmodified) argv. + */ +void trace2_cmd_start_fl(const char *file, int line, const char **argv); + +#define trace2_cmd_start(argv) trace2_cmd_start_fl(__FILE__, __LINE__, (argv)) + +/* + * Emit an 'exit' event. + * + * Write the exit-code that will be passed to exit() or returned + * from main(). + * + * Use this prior to actually calling exit(). + * See "#define exit()" in git-compat-util.h + */ +int trace2_cmd_exit_fl(const char *file, int line, int code); + +#define trace2_cmd_exit(code) (trace2_cmd_exit_fl(__FILE__, __LINE__, (code))) + +/* + * Emit an 'error' event. + * + * Write an error message to the TRACE2 targets. + */ +void trace2_cmd_error_va_fl(const char *file, int line, const char *fmt, + va_list ap); + +#define trace2_cmd_error_va(fmt, ap) \ + trace2_cmd_error_va_fl(__FILE__, __LINE__, (fmt), (ap)) + +/* + * Emit a 'pathname' event with the canonical pathname of the current process + * This gives post-processors a simple field to identify the command without + * having to parse the argv. For example, to distinguish invocations from + * installed versus debug executables. + */ +void trace2_cmd_path_fl(const char *file, int line, const char *pathname); + +#define trace2_cmd_path(p) trace2_cmd_path_fl(__FILE__, __LINE__, (p)) + +/* + * Emit a 'cmd_name' event with the canonical name of the command. + * This gives post-processors a simple field to identify the command + * without having to parse the argv. + */ +void trace2_cmd_name_fl(const char *file, int line, const char *name); + +#define trace2_cmd_name(v) trace2_cmd_name_fl(__FILE__, __LINE__, (v)) + +/* + * Emit a 'cmd_mode' event to further describe the command being run. + * For example, "checkout" can checkout a single file or can checkout a + * different branch. This gives post-processors a simple field to compare + * equivalent commands without having to parse the argv. + */ +void trace2_cmd_mode_fl(const char *file, int line, const char *mode); + +#define trace2_cmd_mode(sv) trace2_cmd_mode_fl(__FILE__, __LINE__, (sv)) + +/* + * Emit an 'alias' expansion event. + */ +void trace2_cmd_alias_fl(const char *file, int line, const char *alias, + const char **argv); + +#define trace2_cmd_alias(alias, argv) \ + trace2_cmd_alias_fl(__FILE__, __LINE__, (alias), (argv)) + +/* + * Emit one or more 'def_param' events for "interesting" configuration + * settings. + * + * Use the TR2_SYSENV_CFG_PARAM setting to register a comma-separated + * list of patterns configured important. For example: + * git config --system trace2.configParams 'core.*,remote.*.url' + * or: + * GIT_TR2_CONFIG_PARAMS=core.*,remote.*.url" + * + * Note: this routine does a read-only iteration on the config data + * (using read_early_config()), so it must not be called until enough + * of the process environment has been established. This includes the + * location of the git and worktree directories, expansion of any "-c" + * and "-C" command line options, and etc. + */ +void trace2_cmd_list_config_fl(const char *file, int line); + +#define trace2_cmd_list_config() trace2_cmd_list_config_fl(__FILE__, __LINE__) + +/* + * Emit a "def_param" event for the given config key/value pair IF + * we consider the key to be "interesting". + * + * Use this for new/updated config settings created/updated after + * trace2_cmd_list_config() is called. + */ +void trace2_cmd_set_config_fl(const char *file, int line, const char *key, + const char *value); + +#define trace2_cmd_set_config(k, v) \ + trace2_cmd_set_config_fl(__FILE__, __LINE__, (k), (v)) + +/* + * Emit a 'child_start' event prior to spawning a child process. + * + * Before calling optionally set "cmd->trace2_child_class" to a string + * describing the type of the child process. For example, "editor" or + * "pager". + */ +void trace2_child_start_fl(const char *file, int line, + struct child_process *cmd); + +#define trace2_child_start(cmd) trace2_child_start_fl(__FILE__, __LINE__, (cmd)) + +/* + * Emit a 'child_exit' event after the child process completes. + */ +void trace2_child_exit_fl(const char *file, int line, struct child_process *cmd, + int child_exit_code); + +#define trace2_child_exit(cmd, code) \ + trace2_child_exit_fl(__FILE__, __LINE__, (cmd), (code)) + +/* + * Emit an 'exec' event prior to calling one of exec(), execv(), + * execvp(), and etc. On Unix-derived systems, this will be the + * last event emitted for the current process, unless the exec + * fails. On Windows, exec() behaves like 'child_start' and a + * waitpid(), so additional events may be emitted. + * + * Returns the "exec_id". + */ +int trace2_exec_fl(const char *file, int line, const char *exe, + const char **argv); + +#define trace2_exec(exe, argv) trace2_exec_fl(__FILE__, __LINE__, (exe), (argv)) + +/* + * Emit an 'exec_result' when possible. On Unix-derived systems, + * this should be called after exec() returns (which only happens + * when there is an error starting the new process). On Windows, + * this should be called after the waitpid(). + * + * The "exec_id" should be the value returned from trace2_exec(). + */ +void trace2_exec_result_fl(const char *file, int line, int exec_id, int code); + +#define trace2_exec_result(id, code) \ + trace2_exec_result_fl(__FILE__, __LINE__, (id), (code)) + +/* + * Emit a 'thread_start' event. This must be called from inside the + * thread-proc to set up the trace2 TLS data for the thread. + * + * Thread names should be descriptive, like "preload_index". + * Thread names will be decorated with an instance number automatically. + */ +void trace2_thread_start_fl(const char *file, int line, + const char *thread_name); + +#define trace2_thread_start(thread_name) \ + trace2_thread_start_fl(__FILE__, __LINE__, (thread_name)) + +/* + * Emit a 'thread_exit' event. This must be called from inside the + * thread-proc to report thread-specific data and cleanup TLS data + * for the thread. + */ +void trace2_thread_exit_fl(const char *file, int line); + +#define trace2_thread_exit() trace2_thread_exit_fl(__FILE__, __LINE__) + +/* + * Emit a 'param' event. + * + * Write a "<param> = <value>" pair describing some aspect of the + * run such as an important configuration setting or command line + * option that significantly changes command behavior. + */ +void trace2_def_param_fl(const char *file, int line, const char *param, + const char *value); + +#define trace2_def_param(param, value) \ + trace2_def_param_fl(__FILE__, __LINE__, (param), (value)) + +/* + * Tell trace2 about a newly instantiated repo object and assign + * a trace2-repo-id to be used in subsequent activity events. + * + * Emits a 'worktree' event for this repo instance. + */ +void trace2_def_repo_fl(const char *file, int line, struct repository *repo); + +#define trace2_def_repo(repo) trace2_def_repo_fl(__FILE__, __LINE__, repo) + +/* + * Emit a 'region_enter' event for <category>.<label> with optional + * repo-id and printf message. + * + * Enter a new nesting level on the current thread and remember the + * current time. This controls the indenting of all subsequent events + * on this thread. + */ +void trace2_region_enter_fl(const char *file, int line, const char *category, + const char *label, const struct repository *repo, ...); + +#define trace2_region_enter(category, label, repo) \ + trace2_region_enter_fl(__FILE__, __LINE__, (category), (label), (repo)) + +void trace2_region_enter_printf_va_fl(const char *file, int line, + const char *category, const char *label, + const struct repository *repo, + const char *fmt, va_list ap); + +#define trace2_region_enter_printf_va(category, label, repo, fmt, ap) \ + trace2_region_enter_printf_va_fl(__FILE__, __LINE__, (category), \ + (label), (repo), (fmt), (ap)) + +void trace2_region_enter_printf_fl(const char *file, int line, + const char *category, const char *label, + const struct repository *repo, + const char *fmt, ...); + +#ifdef HAVE_VARIADIC_MACROS +#define trace2_region_enter_printf(category, label, repo, ...) \ + trace2_region_enter_printf_fl(__FILE__, __LINE__, (category), (label), \ + (repo), __VA_ARGS__) +#else +/* clang-format off */ +__attribute__((format (region_enter_printf, 4, 5))) +void trace2_region_enter_printf(const char *category, const char *label, + const struct repository *repo, const char *fmt, + ...); +/* clang-format on */ +#endif + +/* + * Emit a 'region_leave' event for <category>.<label> with optional + * repo-id and printf message. + * + * Leave current nesting level and report the elapsed time spent + * in this nesting level. + */ +void trace2_region_leave_fl(const char *file, int line, const char *category, + const char *label, const struct repository *repo, ...); + +#define trace2_region_leave(category, label, repo) \ + trace2_region_leave_fl(__FILE__, __LINE__, (category), (label), (repo)) + +void trace2_region_leave_printf_va_fl(const char *file, int line, + const char *category, const char *label, + const struct repository *repo, + const char *fmt, va_list ap); + +#define trace2_region_leave_printf_va(category, label, repo, fmt, ap) \ + trace2_region_leave_printf_va_fl(__FILE__, __LINE__, (category), \ + (label), (repo), (fmt), (ap)) + +void trace2_region_leave_printf_fl(const char *file, int line, + const char *category, const char *label, + const struct repository *repo, + const char *fmt, ...); + +#ifdef HAVE_VARIADIC_MACROS +#define trace2_region_leave_printf(category, label, repo, ...) \ + trace2_region_leave_printf_fl(__FILE__, __LINE__, (category), (label), \ + (repo), __VA_ARGS__) +#else +/* clang-format off */ +__attribute__((format (region_leave_printf, 4, 5))) +void trace2_region_leave_printf(const char *category, const char *label, + const struct repository *repo, const char *fmt, + ...); +/* clang-format on */ +#endif + +/* + * Emit a key-value pair 'data' event of the form <category>.<key> = <value>. + * This event implicitly contains information about thread, nesting region, + * and optional repo-id. + * + * On event-based TRACE2 targets, this generates a 'data' event suitable + * for post-processing. On printf-based TRACE2 targets, this is converted + * into a fixed-format printf message. + */ +void trace2_data_string_fl(const char *file, int line, const char *category, + const struct repository *repo, const char *key, + const char *value); + +#define trace2_data_string(category, repo, key, value) \ + trace2_data_string_fl(__FILE__, __LINE__, (category), (repo), (key), \ + (value)) + +void trace2_data_intmax_fl(const char *file, int line, const char *category, + const struct repository *repo, const char *key, + intmax_t value); + +#define trace2_data_intmax(category, repo, key, value) \ + trace2_data_intmax_fl(__FILE__, __LINE__, (category), (repo), (key), \ + (value)) + +void trace2_data_json_fl(const char *file, int line, const char *category, + const struct repository *repo, const char *key, + const struct json_writer *jw); + +#define trace2_data_json(category, repo, key, value) \ + trace2_data_json_fl(__FILE__, __LINE__, (category), (repo), (key), \ + (value)) + +/* + * Emit a 'printf' event. + * + * Write an arbitrary formatted message to the TRACE2 targets. These + * text messages should be considered as human-readable strings without + * any formatting guidelines. Post-processors may choose to ignore + * them. + */ +void trace2_printf_va_fl(const char *file, int line, const char *fmt, + va_list ap); + +#define trace2_printf_va(fmt, ap) \ + trace2_printf_va_fl(__FILE__, __LINE__, (fmt), (ap)) + +void trace2_printf_fl(const char *file, int line, const char *fmt, ...); + +#ifdef HAVE_VARIADIC_MACROS +#define trace2_printf(...) trace2_printf_fl(__FILE__, __LINE__, __VA_ARGS__) +#else +/* clang-format off */ +__attribute__((format (printf, 1, 2))) +void trace2_printf(const char *fmt, ...); +/* clang-format on */ +#endif + +/* + * Optional platform-specific code to dump information about the + * current and any parent process(es). This is intended to allow + * post-processors to know who spawned this git instance and anything + * else that the platform may be able to tell us about the current process. + */ + +enum trace2_process_info_reason { + TRACE2_PROCESS_INFO_STARTUP, + TRACE2_PROCESS_INFO_EXIT, +}; + +#if defined(GIT_WINDOWS_NATIVE) +void trace2_collect_process_info(enum trace2_process_info_reason reason); +#else +#define trace2_collect_process_info(reason) \ + do { \ + } while (0) +#endif + +#endif /* TRACE2_H */ |