tags/lttv-0.11.3-23102008/ltt/marker.h

   1 #ifndef _LTT_MARKERS_H
   2 #define _LTT_MARKERS_H
   3
   4 /*
   5  * Marker support header.
   6  *
   7  * Mathieu Desnoyers, August 2007
   8  * License: LGPL.
   9  */
  10
  11 #include <glib.h>
  12 #include <ltt/trace.h>
  13 #include <ltt/compiler.h>
  14 #include <ltt/marker-field.h>
  15 #include <ltt/trace.h>
  16
  17 #define LTT_ATTRIBUTE_NETWORK_BYTE_ORDER (1<<1)
  18
  19 /* static ids 0-7 reserved for internal use. */
  20 #define MARKER_CORE_IDS         8
  21
  22 struct marker_info;
  23
  24 struct marker_info {
  25   GQuark name;
  26   char *format;
  27   long size;         /* size if known statically, else -1 */
  28   guint8 largest_align; /* Size of the largest alignment needed in the
  29                            payload. */
  30   GArray *fields;    /* Array of struct marker_field */
  31   guint8 int_size, long_size, pointer_size, size_t_size;
  32   guint8 alignment;  /* Size on which the architecture alignment must be
  33                         done. Useful to encapsulate x86_32 events on
  34                         x86_64 kernels. */
  35   struct marker_info *next; /* Linked list of markers with the same name */
  36 };
  37
  38 enum marker_id {
  39   MARKER_ID_SET_MARKER_ID = 0,  /* Static IDs available (range 0-7) */
  40   MARKER_ID_SET_MARKER_FORMAT,
  41   MARKER_ID_DYNAMIC,    /* Dynamic IDs (range: 8-65535)   */
  42 };
  43
  44 static inline guint16 marker_get_id_from_info(LttTrace *trace,
  45     struct marker_info *info)
  46 {
  47   return ((unsigned long)info - (unsigned long)trace->markers->data)
  48            / sizeof(struct marker_info);
  49 }
  50
  51 static inline struct marker_info *marker_get_info_from_id(LttTrace *trace,
  52     guint16 id)
  53 {
  54   if (unlikely(trace->markers->len <= id))
  55     return NULL;
  56   return &g_array_index(trace->markers, struct marker_info, id);
  57 }
  58
  59 /*
  60  * Returns the head of the marker info list for that name.
  61  */
  62 static inline struct marker_info *marker_get_info_from_name(LttTrace *trace,
  63     GQuark name)
  64 {
  65   gpointer orig_key, value;
  66   int res;
  67
  68   res = g_hash_table_lookup_extended(trace->markers_hash,
  69     (gconstpointer)(gulong)name, &orig_key, &value);
  70   if (!res)
  71     return NULL;
  72   return marker_get_info_from_id(trace, (guint16)(gulong)value);
  73 }
  74
  75 static inline char *marker_get_format_from_name(LttTrace *trace,
  76     GQuark name)
  77 {
  78   gpointer orig_key, value;
  79   int res;
  80
  81   res = g_hash_table_lookup_extended(trace->markers_format_hash,
  82                 (gconstpointer)(gulong)name, &orig_key, &value);
  83   if (!res)
  84     return NULL;
  85   return (char *)value;
  86 }
  87
  88 static inline struct marker_field *marker_get_field(struct marker_info *info,
  89                                                         guint i)
  90 {
  91         return &g_array_index(info->fields, struct marker_field, i);
  92 }
  93
  94 static inline unsigned int marker_get_num_fields(struct marker_info *info)
  95 {
  96         return info->fields->len;
  97 }
  98
  99 /*
 100  * for_each_marker_field  -  iterate over fields of a marker
 101  * @field:      struct marker_field * to use as iterator
 102  * @info:       marker info pointer
 103  */
 104 #define for_each_marker_field(field, info)                              \
 105         for (field = marker_get_field(info, 0);                         \
 106                 field != marker_get_field(info, marker_get_num_fields(info)); \
 107                 field++)
 108
 109 int marker_format_event(LttTrace *trace, GQuark name, const char *format);
 110 int marker_id_event(LttTrace *trace, GQuark name, guint16 id,
 111   uint8_t int_size, uint8_t long_size, uint8_t pointer_size,
 112   uint8_t size_t_size, uint8_t alignment);
 113 int allocate_marker_data(LttTrace *trace);
 114 void destroy_marker_data(LttTrace *trace);
 115
 116 #endif //_LTT_MARKERS_H