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authorJeff Hostetler <jeffhost@microsoft.com>2019-02-22 22:25:01 (GMT)
committerJunio C Hamano <gitster@pobox.com>2019-02-22 23:27:59 (GMT)
commitee4512ed481a126dadd33334186e0e759d7f2f47 (patch)
tree4bc0418115d44b1833c1d24d2ac1c92f067b7ad3 /trace2/tr2_tgt.h
parente544221d97a57a9be7ba18a0df52a15b4cc76f97 (diff)
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trace2: create new combined trace facility
Create a new unified tracing facility for git. The eventual intent is to replace the current trace_printf* and trace_performance* routines with a unified set of git_trace2* routines. In addition to the usual printf-style API, trace2 provides higer-level event verbs with fixed-fields allowing structured data to be written. This makes post-processing and analysis easier for external tools. Trace2 defines 3 output targets. These are set using the environment variables "GIT_TR2", "GIT_TR2_PERF", and "GIT_TR2_EVENT". These may be set to "1" or to an absolute pathname (just like the current GIT_TRACE). * GIT_TR2 is intended to be a replacement for GIT_TRACE and logs command summary data. * GIT_TR2_PERF is intended as a replacement for GIT_TRACE_PERFORMANCE. It extends the output with columns for the command process, thread, repo, absolute and relative elapsed times. It reports events for child process start/stop, thread start/stop, and per-thread function nesting. * GIT_TR2_EVENT is a new structured format. It writes event data as a series of JSON records. Calls to trace2 functions log to any of the 3 output targets enabled without the need to call different trace_printf* or trace_performance* routines. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'trace2/tr2_tgt.h')
-rw-r--r--trace2/tr2_tgt.h133
1 files changed, 133 insertions, 0 deletions
diff --git a/trace2/tr2_tgt.h b/trace2/tr2_tgt.h
new file mode 100644
index 0000000..297bb8f
--- /dev/null
+++ b/trace2/tr2_tgt.h
@@ -0,0 +1,133 @@
+#ifndef TR2_TGT_H
+#define TR2_TGT_H
+
+struct child_process;
+struct repository;
+struct json_writer;
+
+/*
+ * Function prototypes for a TRACE2 "target" vtable.
+ */
+
+typedef int(tr2_tgt_init_t)(void);
+typedef void(tr2_tgt_term_t)(void);
+
+typedef void(tr2_tgt_evt_version_fl_t)(const char *file, int line);
+
+typedef void(tr2_tgt_evt_start_fl_t)(const char *file, int line,
+ const char **argv);
+typedef void(tr2_tgt_evt_exit_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute, int code);
+typedef void(tr2_tgt_evt_signal_t)(uint64_t us_elapsed_absolute, int signo);
+typedef void(tr2_tgt_evt_atexit_t)(uint64_t us_elapsed_absolute, int code);
+
+typedef void(tr2_tgt_evt_error_va_fl_t)(const char *file, int line,
+ const char *fmt, va_list ap);
+
+typedef void(tr2_tgt_evt_command_path_fl_t)(const char *file, int line,
+ const char *command_path);
+typedef void(tr2_tgt_evt_command_name_fl_t)(const char *file, int line,
+ const char *name,
+ const char *hierarchy);
+typedef void(tr2_tgt_evt_command_mode_fl_t)(const char *file, int line,
+ const char *mode);
+
+typedef void(tr2_tgt_evt_alias_fl_t)(const char *file, int line,
+ const char *alias, const char **argv);
+
+typedef void(tr2_tgt_evt_child_start_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute,
+ const struct child_process *cmd);
+typedef void(tr2_tgt_evt_child_exit_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute, int cid,
+ int pid, int code,
+ uint64_t us_elapsed_child);
+
+typedef void(tr2_tgt_evt_thread_start_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute);
+typedef void(tr2_tgt_evt_thread_exit_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute,
+ uint64_t us_elapsed_thread);
+
+typedef void(tr2_tgt_evt_exec_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute, int exec_id,
+ const char *exe, const char **argv);
+typedef void(tr2_tgt_evt_exec_result_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute,
+ int exec_id, int code);
+
+typedef void(tr2_tgt_evt_param_fl_t)(const char *file, int line,
+ const char *param, const char *value);
+
+typedef void(tr2_tgt_evt_repo_fl_t)(const char *file, int line,
+ const struct repository *repo);
+
+typedef void(tr2_tgt_evt_region_enter_printf_va_fl_t)(
+ const char *file, int line, uint64_t us_elapsed_absolute,
+ const char *category, const char *label, const struct repository *repo,
+ const char *fmt, va_list ap);
+typedef void(tr2_tgt_evt_region_leave_printf_va_fl_t)(
+ const char *file, int line, uint64_t us_elapsed_absolute,
+ uint64_t us_elapsed_region, const char *category, const char *label,
+ const struct repository *repo, const char *fmt, va_list ap);
+
+typedef void(tr2_tgt_evt_data_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute,
+ uint64_t us_elapsed_region,
+ const char *category,
+ const struct repository *repo,
+ const char *key, const char *value);
+typedef void(tr2_tgt_evt_data_json_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute,
+ uint64_t us_elapsed_region,
+ const char *category,
+ const struct repository *repo,
+ const char *key,
+ const struct json_writer *value);
+
+typedef void(tr2_tgt_evt_printf_va_fl_t)(const char *file, int line,
+ uint64_t us_elapsed_absolute,
+ const char *fmt, va_list ap);
+
+/*
+ * "vtable" for a TRACE2 target. Use NULL if a target does not want
+ * to emit that message.
+ */
+/* clang-format off */
+struct tr2_tgt {
+ struct tr2_dst *pdst;
+
+ tr2_tgt_init_t *pfn_init;
+ tr2_tgt_term_t *pfn_term;
+
+ tr2_tgt_evt_version_fl_t *pfn_version_fl;
+ tr2_tgt_evt_start_fl_t *pfn_start_fl;
+ tr2_tgt_evt_exit_fl_t *pfn_exit_fl;
+ tr2_tgt_evt_signal_t *pfn_signal;
+ tr2_tgt_evt_atexit_t *pfn_atexit;
+ tr2_tgt_evt_error_va_fl_t *pfn_error_va_fl;
+ tr2_tgt_evt_command_path_fl_t *pfn_command_path_fl;
+ tr2_tgt_evt_command_name_fl_t *pfn_command_name_fl;
+ tr2_tgt_evt_command_mode_fl_t *pfn_command_mode_fl;
+ tr2_tgt_evt_alias_fl_t *pfn_alias_fl;
+ tr2_tgt_evt_child_start_fl_t *pfn_child_start_fl;
+ tr2_tgt_evt_child_exit_fl_t *pfn_child_exit_fl;
+ tr2_tgt_evt_thread_start_fl_t *pfn_thread_start_fl;
+ tr2_tgt_evt_thread_exit_fl_t *pfn_thread_exit_fl;
+ tr2_tgt_evt_exec_fl_t *pfn_exec_fl;
+ tr2_tgt_evt_exec_result_fl_t *pfn_exec_result_fl;
+ tr2_tgt_evt_param_fl_t *pfn_param_fl;
+ tr2_tgt_evt_repo_fl_t *pfn_repo_fl;
+ tr2_tgt_evt_region_enter_printf_va_fl_t *pfn_region_enter_printf_va_fl;
+ tr2_tgt_evt_region_leave_printf_va_fl_t *pfn_region_leave_printf_va_fl;
+ tr2_tgt_evt_data_fl_t *pfn_data_fl;
+ tr2_tgt_evt_data_json_fl_t *pfn_data_json_fl;
+ tr2_tgt_evt_printf_va_fl_t *pfn_printf_va_fl;
+};
+/* clang-format on */
+
+extern struct tr2_tgt tr2_tgt_event;
+extern struct tr2_tgt tr2_tgt_normal;
+extern struct tr2_tgt tr2_tgt_perf;
+
+#endif /* TR2_TGT_H */