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/*
* include/haproxy/trace.h
* This file provides functions for runtime tracing
*
* Copyright (C) 2000-2019 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _HAPROXY_TRACE_H
#define _HAPROXY_TRACE_H
#include <import/ist.h>
#include <haproxy/api.h>
#include <haproxy/list.h>
#include <haproxy/sink-t.h>
#include <haproxy/tools.h>
#include <haproxy/trace-t.h>
/* Make a string from the location of the trace producer as "file:line" */
#define TRC_LOC _TRC_LOC(__FILE__, __LINE__)
#define _TRC_LOC(f,l) __TRC_LOC(f, ":", l)
#define __TRC_LOC(f,c,l) f c #l
/* truncate a macro arg list to exactly 5 args and replace missing ones with NULL.
* The first one (a0) is always ignored.
*/
#define TRC_5ARGS(a0,a1,a2,a3,a4,a5,...) DEFNULL(a1),DEFNULL(a2),DEFNULL(a3),DEFNULL(a4),DEFNULL(a5)
/* reports whether trace is active for the source and the arguments. It uses
* the same criteria as trace() (locking, filtering etc) so it's safe to use
* from application code to decide whether or not to engage in heavier data
* preparation processing.
*/
#define _trace_enabled(level, mask, src, args...) \
(unlikely((src)->state != TRACE_STATE_STOPPED && \
__trace_enabled(level, mask, src, ##args, NULL) > 0))
/* sends a trace for the given source. Arguments are passed in the exact same
* order as in the __trace() function, which is only called if (src)->state is
* not TRACE_STATE_STOPPED. This is the only case where arguments are evaluated.
*/
#define _trace(level, mask, src, args...) \
do { \
if (unlikely((src)->state != TRACE_STATE_STOPPED)) \
__trace(level, mask, src, ##args); \
} while (0)
/* For convenience, TRACE() alone uses the file's default TRACE_LEVEL, most
* likely TRACE_LEVEL_DEVELOPER, though the other explicit variants specify
* the desired level and will work when TRACE_LEVEL is not set. The 5 optional
* arguments are the 4 source-specific arguments that are passed to the cb()
* callback dedicated to decoding, and which may be used for special tracking.
* These 4 arguments as well as the cb() function pointer may all be NULL, or
* simply omitted (in which case they will be replaced by a NULL). This
* ordering allows many TRACE() calls to be placed using copy-paste and just
* change the message at the beginning. Only TRACE_DEVEL(), TRACE_ENTER() and
* TRACE_LEAVE() will report the calling function's name. TRACE_PRINTF() does
* require all the optional a1..a4 to be passed (possibly zero) so that they're
* always followed by the format string, then the values to be formatted.
*
* TRACE_* will call the _trace() macro which will test if the trace is enabled
* before calling the __trace() function. _trace() shouldn't be a function (nor
* inline) itself because we don't want the caller to compute its arguments if
* traces are not enabled.
*
* TRACE_ENABLED() reports whether or not trace is enabled for the current
* source, level, mask and arguments.
*/
#define TRACE_ENABLED(level, mask, args...) (_trace_enabled((level), (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, ##args))
#define TRACE(msg, mask, args...) \
_trace(TRACE_LEVEL, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_ERROR(msg, mask, args...) \
_trace(TRACE_LEVEL_ERROR, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_USER(msg, mask, args...) \
_trace(TRACE_LEVEL_USER, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_DATA(msg, mask, args...) \
_trace(TRACE_LEVEL_DATA, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_PROTO(msg, mask, args...) \
_trace(TRACE_LEVEL_PROTO, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_STATE(msg, mask, args...) \
_trace(TRACE_LEVEL_STATE, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_DEVEL(msg, mask, args...) \
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_ENTER(mask, args...) \
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(0,##args,0,0,0,0,0), ist("entering"))
#define TRACE_LEAVE(mask, args...) \
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(0,##args,0,0,0,0,0), ist("leaving"))
#define TRACE_POINT(mask, args...) \
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(0,##args,0,0,0,0,0), ist("in"))
/* This produces a printf-like trace at level <level> for event mask <mask> and
* trace arguments <a1..a4>. All args mandatory, but may be zero. No output
* callback will be used since we expect the caller to pass a fully formatted
* message that must not be degraded. The output will be truncated to
* TRACE_MAX_MSG-1 bytes (1023 by default). Caller must include <stdio.h> for
* snprintf(). One call will lead to one independent message, which means that
* multiple messages may be interleaved between threads, hence the caller is
* encouraged to prepend a context at the beginning of the format string when
* dumping lists or arrays. The _LOC variation takes the caller's location and
* function name as an ist and a (const char *) respectively, it is meant for
* being called from wrapper function which will work on behalf of a caller.
*/
#define TRACE_PRINTF(level, mask, a1, a2, a3, a4, fmt, args...) \
TRACE_PRINTF_LOC(level, mask, ist(TRC_LOC), __FUNCTION__, a1, a2, a3, a4, fmt, ##args)
#define TRACE_PRINTF_LOC(level, mask, trc_loc, func, a1, a2, a3, a4, fmt, args...) \
do { \
if (TRACE_ENABLED((level), (mask), a1, a2, a3, a4)) { \
char _msg[TRACE_MAX_MSG]; \
size_t _msg_len; \
_msg_len = snprintf(_msg, sizeof(_msg), (fmt), ##args); \
if (_msg_len >= sizeof(_msg)) \
_msg_len = sizeof(_msg) - 1; \
_trace((level), (mask), TRACE_SOURCE, \
trc_loc, func, a1, a2, a3, a4, \
&trace_no_cb, ist2(_msg, _msg_len)); \
} \
} while (0)
#if defined(DEBUG_DEV) || defined(DEBUG_FULL)
# define DBG_TRACE(msg, mask, args...) TRACE(msg, mask, ##args)
# define DBG_TRACE_ERROR(msg, mask, args...) TRACE_ERROR(msg, mask, ##args)
# define DBG_TRACE_USER(msg, mask, args...) TRACE_USER(msg, mask, ##args)
# define DBG_TRACE_DATA(msg, mask, args...) TRACE_DATA(msg, mask, ##args)
# define DBG_TRACE_PROTO(msg, mask, args...) TRACE_PROTO(msg, mask, ##args)
# define DBG_TRACE_STATE(msg, mask, args...) TRACE_STATE(msg, mask, ##args)
# define DBG_TRACE_DEVEL(msg, mask, args...) TRACE_DEVEL(msg, mask, ##args)
# define DBG_TRACE_ENTER(mask, args...) TRACE_ENTER(mask, ##args)
# define DBG_TRACE_LEAVE(mask, args...) TRACE_LEAVE(mask, ##args)
# define DBG_TRACE_POINT(mask, args...) TRACE_POINT(mask, ##args)
# define DBG_TRACE_PRINTF(level, args...) TRACE_PRINTF(level, ##args)
# define DBG_TRACE_PRINTF_LOC(level, args...) TRACE_PRINTF_LOC(level, ##args)
#else
# define DBG_TRACE(msg, mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_ERROR(msg, mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_USER(msg, mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_DATA(msg, mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_PROTO(msg, mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_STATE(msg, mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_DEVEL(msg, mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_ENTER(mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_LEAVE(mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_POINT(mask, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_PRINTF(level, args...) do { /* do nothing */ } while(0)
# define DBG_TRACE_PRINTF_LOC(level, args...) do { /* do nothing */ } while(0)
#endif
extern struct list trace_sources;
extern THREAD_LOCAL struct buffer trace_buf;
int __trace_enabled(enum trace_level level, uint64_t mask, struct trace_source *src,
const struct ist where, const char *func,
const void *a1, const void *a2, const void *a3, const void *a4,
const void **plockptr);
void __trace(enum trace_level level, uint64_t mask, struct trace_source *src,
const struct ist where, const char *func,
const void *a1, const void *a2, const void *a3, const void *a4,
void (*cb)(enum trace_level level, uint64_t mask, const struct trace_source *src,
const struct ist where, const struct ist func,
const void *a1, const void *a2, const void *a3, const void *a4),
const struct ist msg);
void trace_no_cb(enum trace_level level, uint64_t mask, const struct trace_source *src,
const struct ist where, const struct ist func,
const void *a1, const void *a2, const void *a3, const void *a4);
void trace_register_source(struct trace_source *source);
/* return a single char to describe a trace state */
static inline char trace_state_char(enum trace_state st)
{
return (st == TRACE_STATE_RUNNING) ? 'R' :
(st == TRACE_STATE_WAITING) ? 'w' :
'.';
}
/* return a single char to describe an event state */
static inline char trace_event_char(uint64_t conf, uint64_t ev)
{
return (conf & ev) ? '+' : '-';
}
#endif /* _HAPROXY_TRACE_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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