git/trace2.h
Jeff Hostetler 353d3d77f4 trace2: collect Windows-specific process information
Add platform-specific interface to log information about the current
process.

On Windows, this interface is used to indicate whether the git process
is running under a debugger and list names of the process ancestors.

Information for other platforms is left for a future effort.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-02-22 15:27:59 -08:00

386 lines
13 KiB
C

#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 TRACE2 tracing facility if any of the builtin TRACE2
* targets are enabled in 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.
*
* The environment variable "GIT_TR2_CONFIG_PARAMS" can be set to a
* list of patterns considered important. For example:
*
* 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 the platform may be able to tell us about the current process.
*/
#if defined(GIT_WINDOWS_NATIVE)
void trace2_collect_process_info(void);
#else
#define trace2_collect_process_info() \
do { \
} while (0)
#endif
#endif /* TRACE2_H */