Andrew's git - gitweb.git/blob

4b893a55cf73305ce203465aa4244b3189df2ede
   1#ifndef TRACE_H
   2#define TRACE_H
   3
   4#include "git-compat-util.h"
   5#include "strbuf.h"
   6
   7struct trace_key {
   8        const char * const key;
   9        int fd;
  10        unsigned int initialized : 1;
  11        unsigned int  need_close : 1;
  12};
  13
  14#define TRACE_KEY_INIT(name) { "GIT_TRACE_" #name, 0, 0, 0 }
  15
  16extern void trace_repo_setup(const char *prefix);
  17extern int trace_want(struct trace_key *key);
  18extern void trace_disable(struct trace_key *key);
  19extern uint64_t getnanotime(void);
  20
  21#ifndef HAVE_VARIADIC_MACROS
  22
  23__attribute__((format (printf, 1, 2)))
  24extern void trace_printf(const char *format, ...);
  25
  26__attribute__((format (printf, 2, 3)))
  27extern void trace_printf_key(struct trace_key *key, const char *format, ...);
  28
  29__attribute__((format (printf, 2, 3)))
  30extern void trace_argv_printf(const char **argv, const char *format, ...);
  31
  32extern void trace_strbuf(struct trace_key *key, const struct strbuf *data);
  33
  34#else
  35
  36/*
  37 * Macros to add file:line - see above for C-style declarations of how these
  38 * should be used.
  39 */
  40
  41/*
  42 * TRACE_CONTEXT may be set to __FUNCTION__ if the compiler supports it. The
  43 * default is __FILE__, as it is consistent with assert(), and static function
  44 * names are not necessarily unique.
  45 *
  46 * __FILE__ ":" __FUNCTION__ doesn't work with GNUC, as __FILE__ is supplied
  47 * by the preprocessor as a string literal, and __FUNCTION__ is filled in by
  48 * the compiler as a string constant.
  49 */
  50#ifndef TRACE_CONTEXT
  51# define TRACE_CONTEXT __FILE__
  52#endif
  53
  54/*
  55 * Note: with C99 variadic macros, __VA_ARGS__ must include the last fixed
  56 * parameter ('format' in this case). Otherwise, a call without variable
  57 * arguments will have a surplus ','. E.g.:
  58 *
  59 *  #define foo(format, ...) bar(format, __VA_ARGS__)
  60 *  foo("test");
  61 *
  62 * will expand to
  63 *
  64 *  bar("test",);
  65 *
  66 * which is invalid (note the ',)'). With GNUC, '##__VA_ARGS__' drops the
  67 * comma, but this is non-standard.
  68 */
  69
  70#define trace_printf(...) \
  71        trace_printf_key_fl(TRACE_CONTEXT, __LINE__, NULL, __VA_ARGS__)
  72
  73#define trace_printf_key(key, ...) \
  74        trace_printf_key_fl(TRACE_CONTEXT, __LINE__, key, __VA_ARGS__)
  75
  76#define trace_argv_printf(argv, ...) \
  77        trace_argv_printf_fl(TRACE_CONTEXT, __LINE__, argv, __VA_ARGS__)
  78
  79#define trace_strbuf(key, data) \
  80        trace_strbuf_fl(TRACE_CONTEXT, __LINE__, key, data)
  81
  82/* backend functions, use non-*fl macros instead */
  83__attribute__((format (printf, 4, 5)))
  84extern void trace_printf_key_fl(const char *file, int line, struct trace_key *key,
  85                                const char *format, ...);
  86__attribute__((format (printf, 4, 5)))
  87extern void trace_argv_printf_fl(const char *file, int line, const char **argv,
  88                                 const char *format, ...);
  89extern void trace_strbuf_fl(const char *file, int line, struct trace_key *key,
  90                            const struct strbuf *data);
  91
  92#endif /* HAVE_VARIADIC_MACROS */
  93
  94#endif /* TRACE_H */