lttv/lttv/tracecontext.h

   1 /* This file is part of the Linux Trace Toolkit viewer
   2  * Copyright (C) 2003-2004 Michel Dagenais
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License Version 2 as
   6  * published by the Free Software Foundation;
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  16  * MA 02111-1307, USA.
  17  */
  18
  19 #ifndef PROCESSTRACE_H
  20 #define PROCESSTRACE_H
  21
  22 #include <string.h>
  23 #include <lttv/traceset.h>
  24 #include <lttv/attribute.h>
  25 #include <lttv/hook.h>
  26 #include <ltt/ltt.h>
  27 #include <ltt/marker.h>
  28
  29 /* This is the generic part of trace processing. All events within a
  30    certain time interval are accessed and processing hooks are called for
  31    each. The events are examined in monotonically increasing time to more
  32    closely follow the traced system behavior.
  33
  34    Hooks are called at several different places during the processing:
  35    before traceset, after traceset, check trace, before trace, after trace,
  36    check tracefile, before tracefile, after tracefile,
  37    check_event, before_event, before_event_by_id,
  38    after_event, after_event_by_id.
  39
  40    In each case the "check" hooks are called first to determine if further
  41    processing of the trace, tracefile or event is wanted. Then, the before
  42    hooks and the after hooks are called. The before hooks for a traceset
  43    are called before those for the contained traces, which are called before
  44    those for the contained tracefiles. The after hooks are called in reverse
  45    order. The event hooks are called after all the before_tracefile hooks
  46    and before all the after_tracefile hooks.
  47
  48    The hooks receive two arguments, the hook_data and call_data. The hook_data
  49    is specified when the hook is registered and typically links to the
  50    object registering the hook (e.g. a graphical events viewer). The call_data
  51    must contain all the context related to the call. The traceset hooks receive
  52    the LttvTracesetContext provided by the caller. The trace hooks receive
  53    the LttvTraceContext from the traces array in the LttvTracesetContext.
  54    The tracefile and event hooks receive the LttvTracefileContext from
  55    the tracefiles array in the LttvTraceContext. The LttEvent and LttTime
  56    fields in the tracefile context are set to the current event and current
  57    event time before calling the event hooks. No other context field is
  58    modified.
  59
  60    The contexts in the traces and tracefiles arrays must be allocated by
  61    the caller, either before the call or during the before hooks of the
  62    enclosing traceset or trace. The order in the traces array must
  63    correspond to the lttv_traceset_get function. The order in the tracefiles
  64    arrays must correspond to the ltt_trace_control_tracefile_get and
  65    ltt_trace_per_cpu_tracefile_get functions. The traceset, trace and
  66    tracefile contexts may be subtyped as needed. Indeed, both the contexts
  67    and the hooks are defined by the caller. */
  68
  69
  70 typedef struct _LttvTracesetContext LttvTracesetContext;
  71 typedef struct _LttvTracesetContextClass LttvTracesetContextClass;
  72
  73 typedef struct _LttvTraceContext LttvTraceContext;
  74 typedef struct _LttvTraceContextClass LttvTraceContextClass;
  75
  76 typedef struct _LttvTracefileContext LttvTracefileContext;
  77 typedef struct _LttvTracefileContextClass LttvTracefileContextClass;
  78
  79 typedef struct _LttvTracesetContextPosition LttvTracesetContextPosition;
  80 typedef struct _LttvTraceContextPosition LttvTraceContextPosition;
  81
  82 #ifndef LTTVFILTER_TYPE_DEFINED
  83 typedef struct _LttvFilter LttvFilter;
  84 #define LTTVFILTER_TYPE_DEFINED
  85 #endif
  86
  87 #define LTTV_TRACESET_CONTEXT_TYPE  (lttv_traceset_context_get_type ())
  88 #define LTTV_TRACESET_CONTEXT(obj)  (G_TYPE_CHECK_INSTANCE_CAST ((obj), LTTV_TRACESET_CONTEXT_TYPE, LttvTracesetContext))
  89 #define LTTV_TRACESET_CONTEXT_CLASS(vtable)  (G_TYPE_CHECK_CLASS_CAST ((vtable), LTTV_TRACESET_CONTEXT_TYPE, LttvTracesetContextClass))
  90 #define LTTV_IS_TRACESET_CONTEXT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), LTTV_TRACESET_CONTEXT_TYPE))
  91 #define LTTV_IS_TRACESET_CONTEXT_CLASS(vtable) (G_TYPE_CHECK_CLASS_TYPE ((vtable), LTTV_TRACESET_CONTEXT_TYPE))
  92 #define LTTV_TRACESET_CONTEXT_GET_CLASS(inst)  (G_TYPE_INSTANCE_GET_CLASS ((inst), LTTV_TRACESET_CONTEXT_TYPE, LttvTracesetContextClass))
  93
  94 struct _LttvTracesetContext {
  95   GObject parent;
  96
  97   LttvTraceset *ts;
  98   LttvTraceContext **traces;
  99   LttvAttribute *a;
 100   LttvAttribute *ts_a;
 101   TimeInterval time_span;
 102   GTree *pqueue;
 103
 104   LttvTracesetContextPosition *sync_position;   /* position at which to sync the
 105                                                    trace context */
 106 };
 107
 108 struct _LttvTracesetContextClass {
 109   GObjectClass parent;
 110
 111   void (*init) (LttvTracesetContext *self, LttvTraceset *ts);
 112   void (*fini) (LttvTracesetContext *self);
 113   LttvTracesetContext* (*new_traceset_context) (LttvTracesetContext *self);
 114   LttvTraceContext* (*new_trace_context) (LttvTracesetContext *self);
 115   LttvTracefileContext* (*new_tracefile_context) (LttvTracesetContext *self);
 116 };
 117
 118 GType lttv_traceset_context_get_type (void);
 119
 120 void lttv_context_init(LttvTracesetContext *self, LttvTraceset *ts);
 121
 122 void lttv_context_fini(LttvTracesetContext *self);
 123
 124 LttvTracesetContext *
 125 lttv_context_new_traceset_context(LttvTracesetContext *self);
 126
 127 LttvTraceContext *
 128 lttv_context_new_trace_context(LttvTracesetContext *self);
 129
 130 LttvTracefileContext *
 131 lttv_context_new_tracefile_context(LttvTracesetContext *self);
 132
 133
 134 #define LTTV_TRACE_CONTEXT_TYPE  (lttv_trace_context_get_type ())
 135 #define LTTV_TRACE_CONTEXT(obj)  (G_TYPE_CHECK_INSTANCE_CAST ((obj), LTTV_TRACE_CONTEXT_TYPE, LttvTraceContext))
 136 #define LTTV_TRACE_CONTEXT_CLASS(vtable)  (G_TYPE_CHECK_CLASS_CAST ((vtable), LTTV_TRACE_CONTEXT_TYPE, LttvTraceContextClass))
 137 #define LTTV_IS_TRACE_CONTEXT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), LTTV_TRACE_CONTEXT_TYPE))
 138 #define LTTV_IS_TRACE_CONTEXT_CLASS(vtable) (G_TYPE_CHECK_CLASS_TYPE ((vtable), LTTV_TRACE_CONTEXT_TYPE))
 139 #define LTTV_TRACE_CONTEXT_GET_CLASS(inst)  (G_TYPE_INSTANCE_GET_CLASS ((inst), LTTV_TRACE_CONTEXT_TYPE, LttvTraceContextClass))
 140
 141 struct _LttvTraceContext {
 142   GObject parent;
 143
 144   LttvTracesetContext *ts_context;
 145   guint index;                /* in ts_context->traces */
 146   LttTrace *t;
 147   LttvTrace *vt;
 148   //LttvTracefileContext **tracefiles;
 149   GArray *tracefiles;
 150   LttvAttribute *a;
 151   LttvAttribute *t_a;
 152   TimeInterval time_span;
 153 };
 154
 155 struct _LttvTraceContextClass {
 156   GObjectClass parent;
 157 };
 158
 159 GType lttv_trace_context_get_type (void);
 160
 161 #define LTTV_TRACEFILE_CONTEXT_TYPE  (lttv_tracefile_context_get_type ())
 162 #define LTTV_TRACEFILE_CONTEXT(obj)  (G_TYPE_CHECK_INSTANCE_CAST ((obj), LTTV_TRACEFILE_CONTEXT_TYPE, LttvTracefileContext))
 163 #define LTTV_TRACEFILE_CONTEXT_CLASS(vtable)  (G_TYPE_CHECK_CLASS_CAST ((vtable), LTTV_TRACEFILE_CONTEXT_TYPE, LttvTracefileContextClass))
 164 #define LTTV_IS_TRACEFILE_CONTEXT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), LTTV_TRACEFILE_CONTEXT_TYPE))
 165 #define LTTV_IS_TRACEFILE_CONTEXT_CLASS(vtable) (G_TYPE_CHECK_CLASS_TYPE ((vtable), LTTV_TRACEFILE_CONTEXT_TYPE))
 166 #define LTTV_TRACEFILE_CONTEXT_GET_CLASS(inst)  (G_TYPE_INSTANCE_GET_CLASS ((inst), LTTV_TRACEFILE_CONTEXT_TYPE, LttvTracefileContextClass))
 167
 168 struct _LttvTracefileContext {
 169   GObject parent;
 170
 171   LttvTraceContext *t_context;
 172  // gboolean control;
 173   guint index;                /* in ts_context->tracefiles */
 174   LttTracefile *tf;
 175  // LttEvent *e;
 176   LttvHooks *event;
 177   LttvHooksById *event_by_id;
 178   LttTime timestamp;
 179   LttvAttribute *a;
 180   gint target_pid;          /* Target PID of the event.
 181                                 Updated by state.c. -1 means unset. */
 182 };
 183
 184 struct _LttvTracefileContextClass {
 185   GObjectClass parent;
 186 };
 187
 188 GType lttv_tracefile_context_get_type (void);
 189
 190 /* Run through the events in a traceset in sorted order calling all the
 191    hooks appropriately. It starts at the current time and runs until end or
 192    nb_events are processed. */
 193
 194 void lttv_process_traceset(LttvTracesetContext *self, LttTime end,
 195     unsigned nb_events);
 196
 197 /* Process traceset can also be done in smaller pieces calling begin,
 198  * then seek and middle repeatedly, and end. The middle function return the
 199  * number of events processed. It will be smaller than nb_events if the end time
 200  * or end position is reached. */
 201
 202
 203 void lttv_process_traceset_begin(LttvTracesetContext *self,
 204                              LttvHooks       *before_traceset,
 205                              LttvHooks       *before_trace,
 206                              LttvHooks       *before_tracefile,
 207                              LttvHooks       *event,
 208                              LttvHooksByIdChannelArray   *event_by_id_channel);
 209
 210
 211 guint lttv_process_traceset_middle(LttvTracesetContext *self,
 212                               LttTime end,
 213                               gulong nb_events,
 214                               const LttvTracesetContextPosition *end_position);
 215
 216 void lttv_process_traceset_end(LttvTracesetContext *self,
 217                              LttvHooks           *after_traceset,
 218                              LttvHooks           *after_trace,
 219                              LttvHooks           *after_tracefile,
 220                              LttvHooks           *event,
 221                              LttvHooksByIdChannelArray   *event_by_id_channel);
 222
 223
 224 void lttv_process_traceset_seek_time(LttvTracesetContext *self, LttTime start);
 225
 226 void lttv_traceset_context_compute_time_span(LttvTracesetContext *self,
 227         TimeInterval *time_span);
 228
 229 gboolean lttv_process_traceset_seek_position(LttvTracesetContext *self,
 230                                         const LttvTracesetContextPosition *pos);
 231
 232 void lttv_process_trace_seek_time(LttvTraceContext *self, LttTime start);
 233
 234 void lttv_traceset_context_add_hooks(LttvTracesetContext *self,
 235     LttvHooks *before_traceset,
 236     LttvHooks *before_trace,
 237     LttvHooks *before_tracefile,
 238     LttvHooks *event,
 239     LttvHooksByIdChannelArray *event_by_id_channel);
 240
 241 void lttv_traceset_context_remove_hooks(LttvTracesetContext *self,
 242     LttvHooks *after_traceset,
 243     LttvHooks *after_trace,
 244     LttvHooks *after_tracefile,
 245     LttvHooks *event,
 246     LttvHooksByIdChannelArray *event_by_id_channel);
 247
 248 void lttv_trace_context_add_hooks(LttvTraceContext *self,
 249     LttvHooks *before_trace,
 250     LttvHooks *before_tracefile,
 251     LttvHooks *event,
 252     LttvHooksByIdChannelArray *event_by_id_channel);
 253
 254 void lttv_trace_context_remove_hooks(LttvTraceContext *self,
 255     LttvHooks *after_trace,
 256     LttvHooks *after_tracefile,
 257     LttvHooks *event,
 258     LttvHooksByIdChannelArray *event_by_id_channel);
 259
 260 void lttv_tracefile_context_add_hooks(LttvTracefileContext *self,
 261           LttvHooks *before_tracefile,
 262           LttvHooks *event,
 263           LttvHooksById *event_by_id);
 264
 265
 266 void lttv_tracefile_context_remove_hooks(LttvTracefileContext *self,
 267           LttvHooks *after_tracefile,
 268           LttvHooks *event,
 269           LttvHooksById *event_by_id);
 270
 271 typedef struct _LttvTraceHook {
 272   LttvHook h;
 273   struct marker_data *mdata;
 274   GQuark channel;
 275   guint16 id;  /* id of the marker associated with this hook */
 276   GPtrArray *fields;  /* struct marker_fields pointers */
 277   gpointer hook_data;
 278 } LttvTraceHook;
 279
 280 /* Get the head of marker list corresponding to the given trace hook.
 281  */
 282 struct marker_info *lttv_trace_hook_get_marker(LttTrace *t, LttvTraceHook *th);
 283
 284 /* Remove the hooks from the array. Does not free the array itself. */
 285 void lttv_trace_hook_remove_all(GArray **th);
 286
 287 /* Search in the trace for the id of the named event type within the named
 288    facility. Then, find the three (if non null) named fields. All that
 289    information is then used to fill the LttvTraceHook structure. This
 290    is useful to find the specific id for an event within a trace, for
 291    registering a hook using this structure as event data;
 292    it already contains the (up to three) needed fields handles.
 293    Returns the modified LttvTraceHook array.
 294    Prints warnings if events or markers are not found. returns 1 on error,
 295    0 on success.
 296    Adds the hooks to the trace_hooks array.
 297  */
 298
 299 int lttv_trace_find_hook(LttTrace *t, GQuark facility_name, GQuark event_name,
 300     GQuark fields[], LttvHook h, gpointer hook_data, GArray **trace_hooks);
 301
 302 static inline struct marker_field *
 303 lttv_trace_get_hook_field(LttvTraceHook *hook, unsigned int index)
 304 {
 305         return g_ptr_array_index(hook->fields, index);
 306 }
 307
 308 #if 0
 309 static inline GQuark lttv_merge_facility_event_name(GQuark fac, GQuark ev)
 310 {
 311   char *tmp;
 312   const char *sfac, *sev;
 313   GQuark ret;
 314
 315   sfac = g_quark_to_string(fac);
 316   sev = g_quark_to_string(ev);
 317   tmp = g_new(char, strlen(sfac) + strlen(sev) + 3); /* 3: _ \0 \0 */
 318   strcpy(tmp, sfac);
 319   strcat(tmp, "_");
 320   strcat(tmp, sev);
 321   ret = g_quark_from_string(tmp);
 322   g_free(tmp);
 323   return ret;
 324 }
 325 #endif //0
 326
 327 LttvTracefileContext *lttv_traceset_context_get_current_tfc(
 328                              LttvTracesetContext *self);
 329
 330
 331 LttvTracesetContextPosition *lttv_traceset_context_position_new(
 332     const LttvTracesetContext *self);
 333
 334 void lttv_traceset_context_position_save(const LttvTracesetContext *self,
 335                                     LttvTracesetContextPosition *pos);
 336
 337 void lttv_traceset_context_position_destroy(LttvTracesetContextPosition *pos);
 338
 339 void lttv_traceset_context_position_copy(LttvTracesetContextPosition *dest,
 340                                    const LttvTracesetContextPosition *src);
 341
 342 gint lttv_traceset_context_pos_pos_compare(
 343                           const LttvTracesetContextPosition *pos1,
 344                           const LttvTracesetContextPosition *pos2);
 345
 346 gint lttv_traceset_context_ctx_pos_compare(const LttvTracesetContext *self,
 347                                     const LttvTracesetContextPosition *pos2);
 348
 349 LttTime lttv_traceset_context_position_get_time(
 350                                       const LttvTracesetContextPosition *pos);
 351
 352 gint compare_tracefile(gconstpointer a, gconstpointer b);
 353
 354
 355 /* Synchronisation helpers : save/restore synchronization between ltt traces and
 356  * a traceset context. */
 357 void lttv_process_traceset_synchronize_tracefiles(LttvTracesetContext *tsc);
 358
 359 void lttv_process_traceset_get_sync_data(LttvTracesetContext *tsc);
 360
 361 /* Seek n events forward and backward (without filtering) : only use these where
 362  * necessary : the seek backward is costy. */
 363
 364 #define BACKWARD_SEEK_MUL 2 /* Multiplication factor of time_offset between
 365                                backward seek iterations */
 366
 367 static const LttTime seek_back_default_offset = { 1, 0 };
 368
 369 typedef gboolean check_handler(guint count, gboolean *stop_flag, gpointer data);
 370
 371 guint lttv_process_traceset_seek_n_forward(LttvTracesetContext *self,
 372                                            guint n,
 373                                            check_handler *check,
 374                                            gboolean *stop_flag,
 375                                            LttvFilter *filter1,
 376                                            LttvFilter *filter2,
 377                                            LttvFilter *filter3,
 378                                            gpointer data);
 379 typedef void (*seek_time_fct)(LttvTracesetContext *self, LttTime start);
 380
 381 /* If first_offset is ltt_time_zero, it will choose a default value */
 382 guint lttv_process_traceset_seek_n_backward(LttvTracesetContext *self,
 383                                             guint n,
 384                                             LttTime first_offset,
 385                                             seek_time_fct,
 386                                             check_handler *check,
 387                                             gboolean *stop_flag,
 388                                             LttvFilter *filter1,
 389                                             LttvFilter *filter2,
 390                                             LttvFilter *filter3,
 391                                             gpointer data);
 392
 393 #define FIELD_ARRAY(val...) ((GQuark[]){ val, 0 })
 394
 395 #endif // PROCESSTRACE_H