log.hh

   1 #ifndef _GOIR_LOG_HH
   2 #define _GOIR_LOG_HH
   3
   4 #include <cstdarg>
   5 #include <cstdio>
   6
   7 namespace goir {
   8 namespace log {
   9
  10   typedef enum {
  11     wm_trace, wm_summary, // watermarks
  12     histo,
  13     data_out,
  14     edge_details,
  15     debug_eval,
  16
  17     NULLFLAG = -1
  18   } flag;
  19
  20   /* Tracing flags currently in effect. */
  21   extern unsigned flags;
  22
  23   /*
  24    * Takes a NULLFLAG-terminated list of flag arguments, and return
  25    * a bitmask with all those flags set.
  26    */
  27   static inline unsigned bitmask(flag f, ...) {
  28     unsigned mask = 1 << f;
  29     va_list vl;
  30     va_start(vl, f);
  31     do {
  32       flag vf = (flag)va_arg(vl, int);
  33       if (vf == NULLFLAG) break;
  34       mask |= 1 << vf;
  35     } while(1);
  36     va_end(vl);
  37
  38     return mask;
  39   }
  40
  41   static inline bool is_set(flag f) { return (flags & bitmask(f, NULLFLAG)); }
  42
  43   /*
  44    * Trace to stderr, conditionned by the activation of the given
  45    * flag.
  46    */
  47   static inline void trace(flag f, const char* fmt, ...) {
  48     va_list vl;
  49     va_start(vl, fmt);
  50     if (is_set(f))
  51       vfprintf(stderr, fmt, vl);
  52     va_end(vl);
  53   }
  54
  55 }
  56 }
  57
  58 #endif // _GOIR_LOG_HH