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09fb0df6fd
Working on adding traces to mux-h2 revealed that the function names are manually copied a lot in developer traces. The reason is that they are not preprocessor macros and as such cannot be concatenated. Let's slightly adjust the trace() function call to take a function name just after the file:line argument. This argument is only added for the TRACE_DEVEL and 3 new TRACE_ENTER, TRACE_LEAVE, and TRACE_POINT macros and left NULL for others. This way the function name is only reported for traces aimed at the developers. The pretty-print callback was also extended to benefit from this. This will also significantly shrink the data segment as the "entering" and "leaving" strings will now be merged. One technical point worth mentioning is that the function name is *not* passed as an ist to the inline function because it's not considered as a builtin constant by the compiler, and would lead to strlen() being run on it from all call places before calling the inline function. Thus instead we pass the const char * (that the compiler knows where to find) and it's the __trace() function that converts it to an ist for internal consumption and for the pretty-print callback. Doing this avoids losing 5-10% peak performance.
141 lines
5.8 KiB
C
141 lines
5.8 KiB
C
/*
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* include/proto/trace.h
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* This file provides functions for runtime tracing
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*
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* Copyright (C) 2000-2019 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_TRACE_H
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#define _PROTO_TRACE_H
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#include <common/buffer.h>
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#include <common/compat.h>
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#include <common/config.h>
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#include <common/ist.h>
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#include <common/mini-clist.h>
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#include <types/log.h>
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#include <types/sink.h>
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#include <types/trace.h>
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/* Make a string from the location of the trace producer as "file:line" */
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#define TRC_LOC _TRC_LOC(__FILE__, __LINE__)
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#define _TRC_LOC(f,l) __TRC_LOC(f, ":", l)
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#define __TRC_LOC(f,c,l) f c #l
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/* truncate a macro arg list to exactly 5 args and replace missing ones with NULL */
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#define TRC_5ARGS(a1,a2,a3,a4,a5,...) DEFNULL(a1),DEFNULL(a2),DEFNULL(a3),DEFNULL(a4),DEFNULL(a5)
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/* For convenience, TRACE() alone uses the file's default TRACE_LEVEL, most
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* likely TRACE_LEVEL_DEVELOPER, though the other explicit variants specify
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* the desired level and will work when TRACE_LEVEL is not set. The 5 optional
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* arguments are the 4 source-specific arguments that are passed to the cb()
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* callback dedicated to decoding, and which may be used for special tracking.
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* These 4 arguments as well as the cb() function pointer may all be NULL, or
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* simply omitted (in which case they will be replaced by a NULL). This
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* ordering allows many TRACE() calls to be placed using copy-paste and just
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* change the message at the beginning. Only TRACE_DEVEL(), TRACE_ENTER() and
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* TRACE_LEAVE() will report the calling function's name.
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*/
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#define TRACE(msg, mask, ...) \
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trace(TRACE_LEVEL, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(__VA_ARGS__,,,,,), ist(msg))
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#define TRACE_USER(msg, mask, ...) \
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trace(TRACE_LEVEL_USER, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(__VA_ARGS__,,,,,), ist(msg))
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#define TRACE_DATA(msg, mask, ...) \
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trace(TRACE_LEVEL_DATA, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(__VA_ARGS__,,,,,), ist(msg))
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#define TRACE_PROTO(msg, mask, ...) \
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trace(TRACE_LEVEL_PROTO, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(__VA_ARGS__,,,,,), ist(msg))
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#define TRACE_STATE(msg, mask, ...) \
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trace(TRACE_LEVEL_STATE, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(__VA_ARGS__,,,,,), ist(msg))
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#define TRACE_DEVEL(msg, mask, ...) \
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trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(__VA_ARGS__,,,,,), ist(msg))
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#define TRACE_ENTER(mask, ...) \
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trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(__VA_ARGS__,,,,,), ist("entering"))
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#define TRACE_LEAVE(mask, ...) \
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trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(__VA_ARGS__,,,,,), ist("leaving"))
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#define TRACE_POINT(mask, ...) \
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trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(__VA_ARGS__,,,,,), ist("in"))
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extern struct list trace_sources;
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extern THREAD_LOCAL struct buffer trace_buf;
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void __trace(enum trace_level level, uint64_t mask, struct trace_source *src,
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const struct ist where, const char *func,
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const void *a1, const void *a2, const void *a3, const void *a4,
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void (*cb)(enum trace_level level, uint64_t mask, const struct trace_source *src,
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const struct ist where, const struct ist func,
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const void *a1, const void *a2, const void *a3, const void *a4),
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const struct ist msg);
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/* return a single char to describe a trace state */
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static inline char trace_state_char(enum trace_state st)
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{
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return (st == TRACE_STATE_RUNNING) ? 'R' :
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(st == TRACE_STATE_WAITING) ? 'w' :
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'.';
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}
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/* return a single char to describe an event state */
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static inline char trace_event_char(uint64_t conf, uint64_t ev)
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{
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return (conf & ev) ? '+' : '-';
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}
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/* registers trace source <source>. Modifies the list element!
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* The {start,pause,stop,report} events are not changed so the source may
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* preset them.
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*/
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static inline void trace_register_source(struct trace_source *source)
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{
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source->lockon = TRACE_LOCKON_NOTHING;
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source->level = TRACE_LEVEL_USER;
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source->detail_level = LOG_NOTICE;
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source->sink = NULL;
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source->state = TRACE_STATE_STOPPED;
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source->lockon_ptr = NULL;
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LIST_ADDQ(&trace_sources, &source->source_link);
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}
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/* sends a trace for the given source */
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static inline void trace(enum trace_level level, uint64_t mask, struct trace_source *src,
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const struct ist where, const char *func,
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const void *a1, const void *a2, const void *a3, const void *a4,
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void (*cb)(enum trace_level level, uint64_t mask, const struct trace_source *src,
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const struct ist where, const struct ist func,
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const void *a1, const void *a2, const void *a3, const void *a4),
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const struct ist msg)
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{
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if (unlikely(src->state != TRACE_STATE_STOPPED))
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__trace(level, mask, src, where, func, a1, a2, a3, a4, cb, msg);
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}
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#endif /* _PROTO_TRACE_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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