ltt/branches/poly/ltt/event.c

   1 /* This file is part of the Linux Trace Toolkit viewer
   2  * Copyright (C) 2003-2004 Xiangxiu Yang
   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 #include <stdio.h>
  20 #include <string.h>
  21 #include <stdlib.h>
  22
  23 #include <asm/types.h>
  24 #include <linux/byteorder/swab.h>
  25
  26 #include "parser.h"
  27 #include <ltt/ltt.h>
  28 #include "ltt-private.h"
  29 #include <ltt/event.h>
  30 #include <ltt/trace.h>
  31
  32
  33 LttEvent *ltt_event_new()
  34 {
  35   return g_new(LttEvent, 1);
  36 }
  37
  38 void ltt_event_destroy(LttEvent *event)
  39 {
  40   g_free(event);
  41 }
  42
  43
  44 /*****************************************************************************
  45  *Function name
  46  *    ltt_event_refresh_fields   : refresh fields of an event
  47  *Input params
  48  *    offsetRoot      : offset from the root
  49  *    offsetParent    : offset from the parent
  50  *    fld             : field
  51  *    evD             : event data
  52  *Return value
  53  *    int             : size of the field
  54  ****************************************************************************/
  55
  56 int ltt_event_refresh_fields(int offsetRoot,int offsetParent,
  57                              LttField * fld, void *evD)
  58 {
  59   int size, size1, element_number, i, offset1, offset2;
  60   LttType * type = fld->field_type;
  61
  62   switch(type->type_class) {
  63     case LTT_ARRAY:
  64       element_number = (int) type->element_number;
  65       if(fld->field_fixed == 0){// has string or sequence
  66         size = 0;
  67         for(i=0;i<element_number;i++){
  68           size += ltt_event_refresh_fields(offsetRoot+size,size,
  69              fld->child[0], evD+size);
  70         }
  71       }else size = fld->field_size;
  72       break;
  73
  74     case LTT_SEQUENCE:
  75       size1 = fld->sequ_number_size;
  76       element_number = getIntNumber(size1,evD);
  77       type->element_number = element_number;
  78       if(fld->element_size > 0){
  79         size = element_number * fld->element_size;
  80       }else{//sequence has string or sequence
  81         size = 0;
  82         for(i=0;i<element_number;i++){
  83           size += ltt_event_refresh_fields(offsetRoot+size+size1,size+size1,
  84                    fld->child[0], evD+size+size1);
  85         }
  86         size += size1;
  87       }
  88       break;
  89
  90     case LTT_STRING:
  91       size = strlen((char*)evD) + 1; //include end : '\0'
  92       break;
  93
  94     case LTT_STRUCT:
  95       element_number = (int) type->element_number;
  96       if(fld->field_fixed == 0){
  97         offset1 = offsetRoot;
  98         offset2 = 0;
  99         for(i=0;i<element_number;i++){
 100           size=ltt_event_refresh_fields(offset1,offset2,
 101                                         fld->child[i],evD+offset2);
 102           offset1 += size;
 103           offset2 += size;
 104         }
 105         size = offset2;
 106       }else size = fld->field_size;
 107       break;
 108
 109     case LTT_UNION:
 110       size = fld->field_size;
 111       break;
 112
 113     default:
 114       size = fld->field_size;
 115   }
 116
 117 #if 0
 118   if(type->type_class != LTT_STRUCT && type->type_class != LTT_ARRAY &&
 119      type->type_class != LTT_SEQUENCE && type->type_class != LTT_STRING){
 120     size = fld->field_size;
 121   }else if(type->type_class == LTT_ARRAY){
 122     element_number = (int) type->element_number;
 123     if(fld->field_fixed == 0){// has string or sequence
 124       size = 0;
 125       for(i=0;i<element_number;i++){
 126               size += ltt_event_refresh_fields(offsetRoot+size,size,
 127                                          fld->child[0], evD+size);
 128       }
 129     }else size = fld->field_size;
 130   }else if(type->type_class == LTT_SEQUENCE){
 131     size1 = fld->sequ_number_size;
 132     element_number = getIntNumber(size1,evD);
 133     type->element_number = element_number;
 134     if(fld->element_size > 0){
 135       size = element_number * fld->element_size;
 136     }else{//sequence has string or sequence
 137       size = 0;
 138       for(i=0;i<element_number;i++){
 139               size += ltt_event_refresh_fields(offsetRoot+size+size1,size+size1,
 140                                          fld->child[0], evD+size+size1);
 141       }
 142       size += size1;
 143     }
 144   }else if(type->type_class == LTT_STRING){
 145     size = strlen((char*)evD) + 1; //include end : '\0'
 146   }else if(type->type_class == LTT_STRUCT){
 147     element_number = (int) type->element_number;
 148     if(fld->field_fixed == 0){
 149       offset1 = offsetRoot;
 150       offset2 = 0;
 151       for(i=0;i<element_number;i++){
 152               size=ltt_event_refresh_fields(offset1,offset2,
 153                                       fld->child[i],evD+offset2);
 154         offset1 += size;
 155         offset2 += size;
 156       }
 157       size = offset2;
 158     }else size = fld->field_size;
 159   }
 160 #endif //0
 161   fld->offset_root     = offsetRoot;
 162   fld->offset_parent   = offsetParent;
 163   fld->fixed_root      = (offsetRoot==-1)   ? 0 : 1;
 164   fld->fixed_parent    = (offsetParent==-1) ? 0 : 1;
 165   fld->field_size      = size;
 166
 167   return size;
 168 }
 169
 170 /*****************************************************************************
 171  *Function name
 172  *    ltt_event_eventtype_id: get event type id
 173  *                            (base id + position of the event)
 174  *Input params
 175  *    e                     : an instance of an event type
 176  *Return value
 177  *    unsigned              : event type id
 178  ****************************************************************************/
 179
 180 unsigned ltt_event_eventtype_id(LttEvent *e)
 181 {
 182   return (unsigned) e->event_id;
 183 }
 184
 185 /*****************************************************************************
 186  *Function name
 187  *    ltt_event_facility : get the facility of the event
 188  *Input params
 189  *    e                  : an instance of an event type
 190  *Return value
 191  *    LttFacility *     : the facility of the event
 192  ****************************************************************************/
 193
 194 LttFacility *ltt_event_facility(LttEvent *e)
 195 {
 196   LttTrace * trace = e->tracefile->trace;
 197   unsigned id = e->event_id;
 198   return ltt_trace_facility_by_id(trace,id);
 199 }
 200
 201 /*****************************************************************************
 202  *Function name
 203  *    ltt_event_eventtype : get the event type of the event
 204  *Input params
 205  *    e                   : an instance of an event type
 206  *Return value
 207  *    LttEventType *     : the event type of the event
 208  ****************************************************************************/
 209
 210 LttEventType *ltt_event_eventtype(LttEvent *e)
 211 {
 212   LttFacility* facility = ltt_event_facility(e);
 213   if(!facility) return NULL;
 214   return facility->events[e->event_id - facility->base_id];
 215 }
 216
 217 /*****************************************************************************
 218  *Function name
 219  *    ltt_event_field : get the root field of the event
 220  *Input params
 221  *    e               : an instance of an event type
 222  *Return value
 223  *    LttField *      : the root field of the event
 224  ****************************************************************************/
 225
 226 LttField *ltt_event_field(LttEvent *e)
 227 {
 228   LttField * field;
 229   LttEventType * event_type = ltt_event_eventtype(e);
 230   if(unlikely(!event_type)) return NULL;
 231   field = event_type->root_field;
 232   if(unlikely(!field)) return NULL;
 233
 234   //check if the field need refresh
 235   if(likely(e->which_block != event_type->latest_block ||
 236             e->which_event != event_type->latest_event)){
 237
 238     event_type->latest_block = e->which_block;
 239     event_type->latest_event = e->which_event;
 240
 241     if(unlikely(field->field_fixed != 1))
 242       ltt_event_refresh_fields(0, 0, field, e->data);
 243   }
 244   return field;
 245 }
 246
 247 /*****************************************************************************
 248  *Function name
 249  *    ltt_event_time : get the time of the event
 250  *Input params
 251  *    e              : an instance of an event type
 252  *Return value
 253  *    LttTime       : the time of the event
 254  ****************************************************************************/
 255
 256 LttTime ltt_event_time(LttEvent *e)
 257 {
 258   return e->event_time;
 259 }
 260
 261 /*****************************************************************************
 262  *Function name
 263  *    ltt_event_time : get the cycle count of the event
 264  *Input params
 265  *    e              : an instance of an event type
 266  *Return value
 267  *    LttCycleCount  : the cycle count of the event
 268  ****************************************************************************/
 269
 270 LttCycleCount ltt_event_cycle_count(LttEvent *e)
 271 {
 272   return e->event_cycle_count;
 273 }
 274
 275 /*****************************************************************************
 276  *Function name
 277  *    ltt_event_position : get the event's position
 278  *Input params
 279  *    e                  : an instance of an event type
 280  *    ep                 : a pointer to event's position structure
 281  ****************************************************************************/
 282
 283 void ltt_event_position(LttEvent *e, LttEventPosition *ep)
 284 {
 285   ep->block_num         = e->which_block;
 286   ep->event_num         = e->which_event;
 287   ep->event_time        = e->event_time;
 288   ep->event_cycle_count = e->event_cycle_count;
 289   ep->heart_beat_number = e->tracefile->cur_heart_beat_number;
 290   ep->old_position      = TRUE;
 291   ep->event_offset      = e->data - e->tracefile->buffer - EVENT_HEADER_SIZE ;
 292   ep->tf                = e->tracefile;
 293
 294   /* This is a workaround for fast position seek */
 295   ep->last_event_pos = e->last_event_pos;
 296   ep->prev_block_end_time = e->prev_block_end_time;
 297   ep->prev_event_time = e->prev_event_time;
 298   ep->pre_cycle_count = e->pre_cycle_count;
 299   ep->count = e->count;
 300   /* end of workaround */
 301 }
 302
 303 LttEventPosition * ltt_event_position_new()
 304 {
 305   return g_new(LttEventPosition, 1);
 306 }
 307
 308 /*****************************************************************************
 309  *Function name
 310  *    ltt_event_position_get : get the block number and index of the event
 311  *Input params
 312  *    ep                     : a pointer to event's position structure
 313  *    block_number           : the block number of the event
 314  *    index_in_block         : the index of the event within the block
 315  ****************************************************************************/
 316
 317 void ltt_event_position_get(LttEventPosition *ep,
 318     unsigned *block_number, unsigned *index_in_block, LttTracefile ** tf)
 319 {
 320   *block_number   = ep->block_num;
 321   *index_in_block = ep->event_num;
 322   *tf             = ep->tf;
 323 }
 324
 325 /*****************************************************************************
 326  *Function name
 327  *    ltt_event_position_set : set the block number and index of the event
 328  *    It does put the old_position gboolean to FALSE, as it is impossible
 329  *    to know the quick position to seek in the tracefile.
 330  *Input params
 331  *    ep                     : a pointer to event's position structure
 332  *    block_number           : the block number of the event
 333  *    index_in_block         : the index of the event within the block
 334  ****************************************************************************/
 335
 336 void ltt_event_position_set(LttEventPosition *ep,
 337     unsigned block_number, unsigned index_in_block)
 338 {
 339   if(ep->block_num != block_number || ep->event_num != index_in_block)
 340     ep->old_position = FALSE;
 341
 342   ep->block_num = block_number;
 343   ep->event_num = index_in_block;
 344
 345 }
 346
 347 /*****************************************************************************
 348  * Function name
 349  *    ltt_event_position_compare : compare two positions
 350  *    A NULL value is infinite.
 351  * Input params
 352  *    ep1                    : a pointer to event's position structure
 353  *    ep2                    : a pointer to event's position structure
 354  * Return
 355  *    -1 is ep1 < ep2
 356  *    1 if ep1 > ep2
 357  *    0 if ep1 == ep2
 358  ****************************************************************************/
 359
 360
 361 gint ltt_event_position_compare(const LttEventPosition *ep1,
 362                                 const LttEventPosition *ep2)
 363 {
 364   if(ep1->tf != ep2->tf)
 365     g_error("ltt_event_position_compare on different tracefiles makes no sense");
 366   if(ep1 == NULL && ep2 == NULL)
 367       return 0;
 368   if(ep1 != NULL && ep2 == NULL)
 369       return -1;
 370   if(ep1 == NULL && ep2 != NULL)
 371       return 1;
 372
 373   if(ep1->block_num < ep2->block_num)
 374     return -1;
 375   if(ep1->block_num > ep2->block_num)
 376     return 1;
 377   if(ep1->event_num < ep2->event_num)
 378     return -1;
 379   if(ep1->event_num > ep2->event_num)
 380     return 1;
 381   return 0;
 382 }
 383
 384 /*****************************************************************************
 385  * Function name
 386  *    ltt_event_event_position_compare : compare two positions, one in event,
 387  *    other in position opaque structure.
 388  * Input params
 389  *    event                  : a pointer to event structure
 390  *    ep                     : a pointer to event's position structure
 391  * Return
 392  *    -1 is event < ep
 393  *    1 if event > ep
 394  *    0 if event == ep
 395  ****************************************************************************/
 396
 397 gint ltt_event_event_position_compare(const LttEvent *event,
 398                                       const LttEventPosition *ep)
 399 {
 400   if(event == NULL && ep == NULL)
 401       return 0;
 402   if(event != NULL && ep == NULL)
 403       return -1;
 404   if(event == NULL && ep != NULL)
 405       return 1;
 406
 407   g_assert(event->tracefile == ep->tf);
 408
 409   if(event->which_block < ep->block_num)
 410     return -1;
 411   if(event->which_block > ep->block_num)
 412     return 1;
 413   if(event->which_event < ep->event_num)
 414     return -1;
 415   if(event->which_event > ep->event_num)
 416     return 1;
 417   return 0;
 418 }
 419
 420 /*****************************************************************************
 421  * Function name
 422  *    ltt_event_position_copy : copy position
 423  * Input params
 424  *    src                    : a pointer to event's position structure source
 425  *    dest                   : a pointer to event's position structure dest
 426  * Return
 427  *    void
 428  ****************************************************************************/
 429 void ltt_event_position_copy(LttEventPosition *dest,
 430                              const LttEventPosition *src)
 431 {
 432   if(src == NULL)
 433     dest = NULL;
 434   else
 435     *dest = *src;
 436 }
 437
 438
 439 /*****************************************************************************
 440  *Function name
 441  *    ltt_event_cpu_i: get the cpu id where the event happens
 442  *Input params
 443  *    e              : an instance of an event type
 444  *Return value
 445  *    unsigned       : the cpu id
 446  ****************************************************************************/
 447
 448 unsigned ltt_event_cpu_id(LttEvent *e)
 449 {
 450   char * c1, * c2, * c3;
 451   c1 = strrchr(e->tracefile->name,'\\');
 452   c2 = strrchr(e->tracefile->name,'/');
 453   if(c1 == NULL && c2 == NULL){
 454     return (unsigned)atoi(e->tracefile->name);
 455   }else if(c1 == NULL){
 456     c2++;
 457     return (unsigned)atoi(c2);
 458   }else if(c2 == NULL){
 459     c1++;
 460     return (unsigned)atoi(c1);
 461   }else{
 462     c3 = (c1 > c2) ? c1 : c2;
 463     c3++;
 464     return (unsigned)atoi(c3);
 465   }
 466 }
 467
 468 /*****************************************************************************
 469  *Function name
 470  *    ltt_event_data : get the raw data for the event
 471  *Input params
 472  *    e              : an instance of an event type
 473  *Return value
 474  *    void *         : pointer to the raw data for the event
 475  ****************************************************************************/
 476
 477 void *ltt_event_data(LttEvent *e)
 478 {
 479   return e->data;
 480 }
 481
 482 /*****************************************************************************
 483  *Function name
 484  *    ltt_event_field_element_number
 485  *                   : The number of elements in a sequence field is specific
 486  *                     to each event. This function returns the number of
 487  *                     elements for an array or sequence field in an event.
 488  *Input params
 489  *    e              : an instance of an event type
 490  *    f              : a field of the instance
 491  *Return value
 492  *    unsigned       : the number of elements for an array/sequence field
 493  ****************************************************************************/
 494
 495 unsigned ltt_event_field_element_number(LttEvent *e, LttField *f)
 496 {
 497   if(f->field_type->type_class != LTT_ARRAY &&
 498      f->field_type->type_class != LTT_SEQUENCE)
 499     return 0;
 500
 501   if(f->field_type->type_class == LTT_ARRAY)
 502     return f->field_type->element_number;
 503   return (unsigned)  getIntNumber(f->sequ_number_size, e + f->offset_root);
 504 }
 505
 506 /*****************************************************************************
 507  *Function name
 508  *    ltt_event_field_element_select
 509  *                   : Set the currently selected element for a sequence or
 510  *                     array field
 511  *Input params
 512  *    e              : an instance of an event type
 513  *    f              : a field of the instance
 514  *    i              : the ith element
 515  ****************************************************************************/
 516
 517 void ltt_event_field_element_select(LttEvent *e, LttField *f, unsigned i)
 518 {
 519   unsigned element_number;
 520   LttField *fld;
 521   unsigned int k;
 522   int size;
 523   void *evD;
 524
 525   if(f->field_type->type_class != LTT_ARRAY &&
 526      f->field_type->type_class != LTT_SEQUENCE)
 527     return ;
 528
 529   element_number  = ltt_event_field_element_number(e,f);
 530   /* Sanity check for i : 1..n only, and must be lower or equal element_number
 531    */
 532   if(element_number < i || i == 0) return;
 533
 534   fld = f->child[0];
 535
 536   evD = e->data + f->offset_root;
 537   size = 0;
 538   for(k=0;k<i;k++){
 539     size += ltt_event_refresh_fields(f->offset_root+size,size, fld, evD+size);
 540   }
 541   f->current_element = i - 1;
 542 }
 543
 544 /*****************************************************************************
 545  * These functions extract data from an event after architecture specific
 546  * conversions
 547  ****************************************************************************/
 548
 549 unsigned ltt_event_get_unsigned(LttEvent *e, LttField *f)
 550 {
 551   int revFlag = e->tracefile->trace->my_arch_endian ==
 552                 e->tracefile->trace->system_description->endian ? 0:1;
 553   LttTypeEnum t = f->field_type->type_class;
 554
 555   g_assert(t == LTT_UINT || t == LTT_ENUM);
 556
 557   if(f->field_size == 1){
 558     guint8 x = *(guint8 *)(e->data + f->offset_root);
 559     return (unsigned int) x;
 560   }else if(f->field_size == 2){
 561     guint16 x = *(guint16 *)(e->data + f->offset_root);
 562     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 563       return (unsigned int) (revFlag ? GUINT16_FROM_BE(x): x);
 564     else
 565       return (unsigned int) (revFlag ? GUINT16_FROM_LE(x): x);
 566   }else if(f->field_size == 4){
 567     guint32 x = *(guint32 *)(e->data + f->offset_root);
 568     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 569       return (unsigned int) (revFlag ? GUINT32_FROM_BE(x): x);
 570     else
 571       return (unsigned int) (revFlag ? GUINT32_FROM_LE(x): x);
 572   }else if(f->field_size == 8){
 573     guint64 x = *(guint64 *)(e->data + f->offset_root);
 574     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 575       return (unsigned int) (revFlag ? GUINT64_FROM_BE(x): x);
 576     else
 577       return (unsigned int) (revFlag ? GUINT64_FROM_LE(x): x);
 578   }
 579   g_critical("ltt_event_get_unsigned : field size %i unknown", f->field_size);
 580   return 0;
 581 }
 582
 583 int ltt_event_get_int(LttEvent *e, LttField *f)
 584 {
 585   int revFlag = e->tracefile->trace->my_arch_endian ==
 586                 e->tracefile->trace->system_description->endian ? 0:1;
 587
 588   g_assert(f->field_type->type_class == LTT_INT);
 589
 590   if(f->field_size == 1){
 591     gint8 x = *(gint8 *)(e->data + f->offset_root);
 592     return (int) x;
 593   }else if(f->field_size == 2){
 594     gint16 x = *(gint16 *)(e->data + f->offset_root);
 595     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 596       return (int) (revFlag ? GINT16_FROM_BE(x): x);
 597     else
 598       return (int) (revFlag ? GINT16_FROM_LE(x): x);
 599   }else if(f->field_size == 4){
 600     gint32 x = *(gint32 *)(e->data + f->offset_root);
 601     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 602       return (int) (revFlag ? GINT32_FROM_BE(x): x);
 603     else
 604       return (int) (revFlag ? GINT32_FROM_LE(x): x);
 605   }else if(f->field_size == 8){
 606     gint64 x = *(gint64 *)(e->data + f->offset_root);
 607     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 608       return (int) (revFlag ? GINT64_FROM_BE(x): x);
 609     else
 610       return (int) (revFlag ? GINT64_FROM_LE(x): x);
 611   }
 612   g_critical("ltt_event_get_int : field size %i unknown", f->field_size);
 613   return 0;
 614 }
 615
 616 unsigned long ltt_event_get_long_unsigned(LttEvent *e, LttField *f)
 617 {
 618   int revFlag = e->tracefile->trace->my_arch_endian ==
 619                 e->tracefile->trace->system_description->endian ? 0:1;
 620   LttTypeEnum t = f->field_type->type_class;
 621
 622   g_assert(t == LTT_UINT || t == LTT_ENUM);
 623
 624   if(f->field_size == 1){
 625     guint8 x = *(guint8 *)(e->data + f->offset_root);
 626     return (unsigned long) x;
 627   }else if(f->field_size == 2){
 628     guint16 x = *(guint16 *)(e->data + f->offset_root);
 629     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 630       return (unsigned long) (revFlag ? GUINT16_FROM_BE(x): x);
 631     else
 632       return (unsigned long) (revFlag ? GUINT16_FROM_LE(x): x);
 633   }else if(f->field_size == 4){
 634     guint32 x = *(guint32 *)(e->data + f->offset_root);
 635     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 636       return (unsigned long) (revFlag ? GUINT32_FROM_BE(x): x);
 637     else
 638       return (unsigned long) (revFlag ? GUINT32_FROM_LE(x): x);
 639   }else if(f->field_size == 8){
 640     guint64 x = *(guint64 *)(e->data + f->offset_root);
 641     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 642       return (unsigned long) (revFlag ? GUINT64_FROM_BE(x): x);
 643     else
 644       return (unsigned long) (revFlag ? GUINT64_FROM_LE(x): x);
 645   }
 646   g_critical("ltt_event_get_long_unsigned : field size %i unknown", f->field_size);
 647   return 0;
 648 }
 649
 650 long int ltt_event_get_long_int(LttEvent *e, LttField *f)
 651 {
 652   int revFlag = e->tracefile->trace->my_arch_endian ==
 653                 e->tracefile->trace->system_description->endian ? 0:1;
 654
 655   g_assert( f->field_type->type_class == LTT_INT);
 656
 657   if(f->field_size == 1){
 658     gint8 x = *(gint8 *)(e->data + f->offset_root);
 659     return (long) x;
 660   }else if(f->field_size == 2){
 661     gint16 x = *(gint16 *)(e->data + f->offset_root);
 662     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 663       return (long) (revFlag ? GINT16_FROM_BE(x): x);
 664     else
 665       return (long) (revFlag ? GINT16_FROM_LE(x): x);
 666   }else if(f->field_size == 4){
 667     gint32 x = *(gint32 *)(e->data + f->offset_root);
 668     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 669       return (long) (revFlag ? GINT32_FROM_BE(x): x);
 670     else
 671       return (long) (revFlag ? GINT32_FROM_LE(x): x);
 672   }else if(f->field_size == 8){
 673     gint64 x = *(gint64 *)(e->data + f->offset_root);
 674     if(e->tracefile->trace->my_arch_endian == LTT_LITTLE_ENDIAN)
 675       return (long) (revFlag ? GINT64_FROM_BE(x): x);
 676     else
 677       return (long) (revFlag ? GINT64_FROM_LE(x): x);
 678   }
 679   g_critical("ltt_event_get_long_int : field size %i unknown", f->field_size);
 680   return 0;
 681 }
 682
 683 float ltt_event_get_float(LttEvent *e, LttField *f)
 684 {
 685   int revFlag = e->tracefile->trace->my_arch_endian ==
 686                 e->tracefile->trace->system_description->endian ? 0:1;
 687
 688   g_assert(f->field_type->type_class == LTT_FLOAT && f->field_size == 4);
 689
 690   if(revFlag == 0) return *(float *)(e->data + f->offset_root);
 691   else{
 692     guint32 aInt;
 693     memcpy((void*)&aInt, e->data + f->offset_root, 4);
 694     aInt = ___swab32(aInt);
 695     return ((float)aInt);
 696   }
 697 }
 698
 699 double ltt_event_get_double(LttEvent *e, LttField *f)
 700 {
 701   int revFlag = e->tracefile->trace->my_arch_endian ==
 702                 e->tracefile->trace->system_description->endian ? 0:1;
 703
 704   g_assert(f->field_type->type_class == LTT_FLOAT && f->field_size == 8);
 705
 706   if(revFlag == 0) return *(double *)(e->data + f->offset_root);
 707   else{
 708     guint64 aInt;
 709     memcpy((void*)&aInt, e->data + f->offset_root, 8);
 710     aInt = ___swab64(aInt);
 711     return ((double)aInt);
 712   }
 713 }
 714
 715 /*****************************************************************************
 716  * The string obtained is only valid until the next read from
 717  * the same tracefile.
 718  ****************************************************************************/
 719
 720 char *ltt_event_get_string(LttEvent *e, LttField *f)
 721 {
 722   g_assert(f->field_type->type_class == LTT_STRING);
 723
 724   return (char*)g_strdup((char*)(e->data + f->offset_root));
 725 }