aboutsummaryrefslogtreecommitdiff
path: root/src/monkey/cpp_int.cc
blob: 815d6f7b7935779a9284ac5065cadb0d48352663 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
/**[txh]********************************************************************

  Copyright (c) 2004-2007 by Salvador E. Tropea.
  Covered by the GPL license.

  Module: C++ Interface.
  Comments:
  Implements a very simple (naive ;-) C++ wrapper.@p

***************************************************************************/

#include <string.h>
#include <limits.h>
#include "mi_gdb.h"

/**[txh]********************************************************************

  Description:
  Initializes a debugger object. It starts in the "disconnected" state.
Use @x{::Connect} after it.
  
***************************************************************************/

MIDebugger::MIDebugger()
{
 state=disconnected;
 h=NULL;
 aux_tty=NULL;
 waitingTempBkpt=0;
 targetEndian=enUnknown;
 targetArch=arUnknown;
}

/**[txh]********************************************************************

  Description:
  This is the destructor for the class. It tries to change the state to
"disconnected" doing the needed actions.
  
***************************************************************************/

MIDebugger::~MIDebugger()
{
 if (state==running)
   {
    Stop();
    mi_stop *rs;
    // TODO: Some kind of time-out
    while (!Poll(rs));
    mi_free_stop(rs);
    state=stopped;
   }
 if (state==stopped)
   {
    Kill();
    state=target_specified;
   }
 if (state==target_specified)
   {
    TargetUnselect();
    state=connected;
   }
 if (state==connected)
    Disconnect();
 // Here state==disconnected
}

/**[txh]********************************************************************

  Description:
  Connects to gdb. Currently only local connections are supported, that's
a gdb limitation. Call it when in "unconnected" state, on success it will
change to the "connected" state.  After it you should call one of the
SelectTarget members. @x{::SelectTargetX11}, @x{::SelectTargetLinux} or
@x{::SelectTargetRemote}. To finish the connection use @x{::Disconnect}.

  Return: !=0 OK.
  
***************************************************************************/

int MIDebugger::Connect(bool )
{
 if (state==disconnected)
   {
    h=mi_connect_local();
    if (h!=NULL)
      {
       state=connected;
       return 1;
      }
   }
 return 0;
}

/**[txh]********************************************************************

  Description:
  Finishes the connection to gdb. Call when in "connected" state, on success
it will change to "disconnected" state. This function first tries to exit
from gdb and then close the connection. But if gdb fails to exit it will be
killed.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::Disconnect()
{
 if (state==connected)
   {
    gmi_gdb_exit(h);
    mi_disconnect(h);
    state=disconnected;
    return 1;
   }
 return 0;
}

/**[txh]********************************************************************

  Description:
  Protected member that implements @x{::SelectTargetX11} and
@x{::SelectTargetLinux}.
  
  Return: !=0 OK.
  
***************************************************************************/

int MIDebugger::SelectTargetTTY(const char *exec, const char *args,
                                const char *auxtty, dMode m)
{
 if (state!=connected)
    return 0;

 targetEndian=enUnknown;
 targetArch=arUnknown;
 mode=m;
 if (!gmi_set_exec(h,exec,args))
    return 0;

 const char *tty_name;
 #ifndef __CYGWIN__
 if (!auxtty)
   {
    aux_tty=m==dmLinux ? gmi_look_for_free_vt() : gmi_start_xterm();
    if (!aux_tty)
       return 0;
    tty_name=aux_tty->tty;
   }
 else
   {
    tty_name=auxtty;
   }
 if (!gmi_target_terminal(h,tty_name))
    return 0;
 #else
 tty_name=NULL;
 if (!gmi_gdb_set(h,"new-console","on"))
    return 0;
 #endif

 state=target_specified;
 preRun=false;
 return 1;
}

/**[txh]********************************************************************

  Description:
  Starts a debug session for X11. It opens an xterm console for the program
to debug and tells gdb which executable to debug and the command line
options to pass. You can specify an already existing tty console to be used.
Can be called when the state is "connected". On success will change to the
"target_specified" state. After it you can use @x{::Run} or use the members
to define breakpoints and similar stuff. To finish it use
@x{::TargetUnselect}.
  
  Return: !=0 OK.
  
***************************************************************************/

int MIDebugger::SelectTargetX11(const char *exec, const char *args,
                                const char *auxtty)
{
 return SelectTargetTTY(exec,args,auxtty,dmX11);
}


/**[txh]********************************************************************

  Description:
  Starts a debug session for Linux console. It selects an empty VT for the
program to debug and tells gdb which executable to debug and the command line
options to pass. You can specify an already existing tty console to be used.
Can be called when the state is "connected". On success will change to the
"target_specified" state. After it you can use @x{::Run} or use the members
to define breakpoints and similar stuff. To finish it use
@x{::TargetUnselect}.
  
  Return: !=0 OK.
  
***************************************************************************/

int MIDebugger::SelectTargetLinux(const char *exec, const char *args,
                                  const char *auxtty)
{
 return SelectTargetTTY(exec,args,auxtty,dmLinux);
}

/**[txh]********************************************************************

  Description:
  Starts a remote session. The other end should be running gdbserver. You
must specify a local copy of the program to debug with debug info. The remote
copy can be stripped. The @var{rtype} and @var{rparams} selects the protocol
and the remote machine. Read gdb docs to know more about the available
options. If @var{rtype} is omitted "extended-remote" protocol is used.
Can be called when the state is "connected". On success will change to the
"target_specified" state. After it you can use @x{::Run} or use the members
to define breakpoints and similar stuff. To finish it use
@x{::TargetUnselect}. Note that when gdb uses remote debugging the remote
program starts running. The @x{::Run} member knows about it.
  
  Return: !=0 OK.
  Example:
  o->SelectTargetRemote("./exec_file","192.168.1.65:5000");
  
***************************************************************************/

int MIDebugger::SelectTargetRemote(const char *exec, const char *rparams,
                                   const char *rtype, bool download)
{
 if (state!=connected)
    return 0;

 mode=dmRemote;
 preRun=true;
 targetEndian=enUnknown;
 targetArch=arUnknown;
 if (rtype==NULL)
    rtype="extended-remote";

 /* Tell gdb to load symbols from the local copy. */
 int res=download ? gmi_set_exec(h,exec,NULL) : gmi_file_symbol_file(h,exec);
 if (!res)
    return 0;
 /* Select the target */
 if (!gmi_target_select(h,rtype,rparams))
    return 0;
 /* Download the binary */
 if (download)
   {
    if (!gmi_target_download(h))
       return 0;
   }

 state=target_specified;
 return 1;
}

/**[txh]********************************************************************

  Description:
  Starts a local session using an already running process.
  
  Return: !=0 OK.
  
***************************************************************************/

mi_frames *MIDebugger::SelectTargetPID(const char *exec, int pid)
{
 if (state!=connected)
    return NULL;

 mode=dmPID;
 preRun=false;
 targetEndian=enUnknown;
 targetArch=arUnknown;

 mi_frames *res=gmi_target_attach(h,pid);
 if (res)
   {
    state=stopped;

    /* Tell gdb to load symbols from the local copy. */
    if (!gmi_file_symbol_file(h,exec))
      {
       mi_free_frames(res);
       return NULL;
      }
   }

 return res;
}

/**[txh]********************************************************************

  Description:
  Used to unselect the current target. When X11 mode it closes the auxiliar
terminal. For remote debugging it uses "detach". Can be called when in
"target_specified" state. On success it changes to "connected" state.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::TargetUnselect()
{
 switch (mode)
   {
    case dmX11:
    case dmLinux:
         if (state!=target_specified)
            return 0;
         if (aux_tty)
           {
            gmi_end_aux_term(aux_tty);
            aux_tty=NULL;
           }
         break;
    case dmPID:
    case dmRemote:
         if (state!=target_specified)
           {
            if (state!=stopped || !gmi_target_detach(h))
               return 0;
           }
         break;
   }
 state=connected;
 return 1;
}

/**[txh]********************************************************************

  Description:
  Starts running the program. You should set breakpoint before it. Can be
called when state is "target_specified". On success will change to "running"
state. After it you should poll for async responses using @x{::Poll}. The
program can stop for many reasons asynchronously and also exit. This
information is known using Poll. You can stop the program using @x{::Stop}.
  
  Return: !=0 OK.
  
***************************************************************************/

int MIDebugger::Run()
{
 if (state!=target_specified)
    return 0;

 int res;
 if (preRun)
    res=gmi_exec_continue(h);
 else
    res=gmi_exec_run(h);
 if (res)
    state=running;

 return res;
}

/**[txh]********************************************************************

  Description:
  Stops the program execution. GDB sends an interrupt signal to the program.
Can be called when the state is "running". It won't switch to "stopped"
state automatically. Instead you must poll for async events and wait for a
stopped notification. After it you can call @x{::Continue} to resume
execution.
  
  Return: 
  Example: !=0 OK
  
***************************************************************************/

int MIDebugger::Stop()
{
 if (state!=running)
    return 0;
 return gmi_exec_interrupt(h);
}

/**[txh]********************************************************************

  Description:
  Polls gdb looking for async responses. Currently it just looks for
"stopped" messages. You must call it when the state is "running". But the
function will poll gdb even if the state isn't "running". When a stopped
message is received the state changes to stopped or target_specified (the
last is when we get some exit).
  
  Return: !=0 if we got a response. The @var{rs} pointer will point to an
mi_stop structure if we got it or will be NULL if we didn't.
  
***************************************************************************/

int MIDebugger::Poll(mi_stop *&rs)
{
 if (state==disconnected || !mi_get_response(h))
    return 0;

 mi_stop *res=mi_res_stop(h);
 if (res)
   {
    if (res->reason==sr_exited_signalled ||
        res->reason==sr_exited ||
        res->reason==sr_exited_normally)
       // When we use a PID the exit makes it invalid, so we don't have a
       // valid target to re-run.
       state=mode==dmPID ? connected : target_specified;
    else
       state=stopped;
    if (res->reason==sr_unknown && waitingTempBkpt)
      {
       waitingTempBkpt=0;
       res->reason=sr_bkpt_hit;
      }
   }
 else
   {// We got an error. It looks like most async commands returns running even
    // before they are sure the process is running. Latter we get the real
    // error. So I'm assuming the program is stopped.
    // Lamentably -target-exec-status isn't implemented and even in this case
    // if the program is really running as real async isn't implemented it
    // will fail anyways.
    if (state==running)
       state=stopped;
   }
 rs=res;
 return 1;
}

/**[txh]********************************************************************

  Description:
  Resumes execution after the program "stopped". Can be called when the state
is stopped. On success will change to "running" state.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::Continue()
{
 if (state!=stopped)
    return 0;
 int res=gmi_exec_continue(h);
 if (res)
    state=running;
 return res;
}

/**[txh]********************************************************************

  Description:
  Starts program execution or resumes it. When the state is target_specified
it calls @x{::Run} otherwise it uses @x{::Continue}. Can be called when the
state is "target_specified" or "stopped". On success will change to
"running" state.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::RunOrContinue()
{
 if (state==target_specified)
    return Run();
 return Continue();
}

/**[txh]********************************************************************

  Description:
  Kills the program you are debugging. Can be called when the state is
"stopped" or "running". On success changes the state to "target_specified".
Note that if you want to restart the program you can just call @x{::Run} and
if you want to just stop the program call @x{::Stop}.

  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::Kill()
{
 if (state!=stopped && state!=running)
    return 0;
 /* GDB/MI doesn't implement it (yet), so we use the regular kill. */
 /* Ensure confirm is off. */
 char *prev=gmi_gdb_show(h,"confirm");
 if (!prev)
    return 0;
 if (strcmp(prev,"off"))
   {
    if (!gmi_gdb_set(h,"confirm","off"))
      {
       free(prev);
       return 0;
      }
   }
 else
   {
    free(prev);
    prev=NULL;
   }
 /* Do the kill. */
 int res=gmi_exec_kill(h);
 /* Revert confirm option if needed. */
 if (prev)
   {
    gmi_gdb_set(h,"confirm",prev);
    free(prev);
   }

 if (res)
    state=target_specified;

 return res;
}

/**[txh]********************************************************************

  Description:
  Inserts a breakpoint at @var{file} and @var{line}. Can be called when the
state is "stopped" or "target_specified".
  
  Return: An mi_bkpt structure or NULL if error.
  
***************************************************************************/

mi_bkpt *MIDebugger::Breakpoint(const char *file, int line)
{
 if (state!=stopped && state!=target_specified)
    return NULL;
 return gmi_break_insert(h,file,line);
}

/**[txh]********************************************************************

  Description:
  Inserts a breakpoint at @var{where}, all options available. Can be called
when the state is "stopped" or "target_specified".
  
  Return: An mi_bkpt structure or NULL if error.
  
***************************************************************************/

mi_bkpt *MIDebugger::Breakpoint(const char *where, bool temporary,
                                const char *cond, int count, int thread,
                                bool hard_assist)
{
 if (state!=stopped && state!=target_specified)
    return NULL;
 return gmi_break_insert_full(h,temporary,hard_assist,cond,count,thread,where);
}


const int maxWhere=PATH_MAX+256;

mi_bkpt *MIDebugger::Breakpoint(mi_bkpt *b)
{
 if (state!=stopped && state!=target_specified)
    return NULL;

 char buf[maxWhere];
 buf[0]=0;
 switch (b->mode)
   {
    case m_file_line:
         snprintf(buf,maxWhere,"%s:%d",b->file,b->line);
         break;
    case m_function:
         snprintf(buf,maxWhere,"%s",b->func);
         break;
    case m_file_function:
         snprintf(buf,maxWhere,"%s:%s",b->file,b->func);
         break;
    case m_address:
         snprintf(buf,maxWhere,"*%p",b->addr);
         break;
   }
 return Breakpoint(buf,b->disp==d_del,b->cond,b->ignore,b->thread,
                   b->type==t_hw);
}

/**[txh]********************************************************************

  Description:
  Inserts a breakpoint at @var{file} and @var{line} all options available.
Can be called when the state is "stopped" or "target_specified".
  
  Return: An mi_bkpt structure or NULL if error.
  
***************************************************************************/

mi_bkpt *MIDebugger::BreakpointFull(const char *file, int line,
                                    bool temporary, const char *cond,
                                    int count, int thread, bool hard_assist)
{
 if (state!=stopped && state!=target_specified)
    return NULL;
 return gmi_break_insert_full_fl(h,file,line,temporary,hard_assist,cond,
                                 count,thread);
}

/**[txh]********************************************************************

  Description:
  Removes the specified breakpoint. It doesn't free the structure. Can be
called when the state is "stopped" or "target_specified".
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::BreakDelete(mi_bkpt *b)
{
 if ((state!=stopped && state!=target_specified) || !b)
    return 0;
 return gmi_break_delete(h,b->number);
}

/**[txh]********************************************************************

  Description:
  Inserts a watchpoint for the specified expression. Can be called when the
state is "stopped" or "target_specified".
  
  Return: An mi_wp structure or NULL if error.
  
***************************************************************************/

mi_wp *MIDebugger::Watchpoint(enum mi_wp_mode mode, const char *exp)
{
 if (state!=stopped && state!=target_specified)
    return NULL;
 return gmi_break_watch(h,mode,exp);
}

/**[txh]********************************************************************

  Description:
  Removes the specified watchpoint. It doesn't free the structure. Can be
called when the state is "stopped" or "target_specified".
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::WatchDelete(mi_wp *w)
{
 if ((state!=stopped && state!=target_specified) || !w)
    return 0;
 return gmi_break_delete(h,w->number);
}

/**[txh]********************************************************************

  Description:
  Puts a temporal breakpoint in main function and starts running. Can be
called when the state is "target_specified". If successful the state will
change to "running".
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::RunToMain()
{
 if (state!=target_specified)
    return 0;
 mi_bkpt *b=Breakpoint(mi_get_main_func(),true);
 if (!b)
    return 0;
 mi_free_bkpt(b);
 waitingTempBkpt=1;
 return Run();
}

/**[txh]********************************************************************

  Description:
  Executes upto the next line, doesn't follow function calls. The @var{inst}
argument is for assembler. If the state is "target_specified" it will go to
the first line in the main function. If the state is "stopped" will use the
next command. If successfully the state will change to "running".
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::StepOver(bool inst)
{
 int res=0;

 if (state==target_specified)
   {// We aren't running
    // Walk to main
    return RunToMain();
   }
 if (state==stopped)
   {
    if (inst)
       res=gmi_exec_next_instruction(h);
    else
       res=gmi_exec_next(h);
    if (res)
       state=running;
   }
 return res;
}

/**[txh]********************************************************************

  Description:
  Executes until the specified point. If the state is "target_specified" it
uses a temporal breakpoint. If the state is "stopped" it uses -exec-until.
Fails for any other state.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::GoTo(const char *file, int line)
{
 int res=0;

 if (state==target_specified)
   {// We aren't running
    // Use a temporal breakpoint
    int l=strlen(file)+32;
    char buf[l];
    snprintf(buf,l,"%s:%d",file,line);
    mi_bkpt *b=Breakpoint(buf,true);
    if (b)
      {
       mi_free_bkpt(b);
       waitingTempBkpt=1;
       res=Run();
      }
   }
 else if (state==stopped)
   {
    res=gmi_exec_until(h,file,line);
    if (res)
       state=running;
   }
 return res;
}

/**[txh]********************************************************************

  Description:
  Executes until the specified point. If the state is "target_specified" it
uses a temporal breakpoint. If the state is "stopped" it uses -exec-until.
Fails for any other state.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::GoTo(void *addr)
{
 int res=0;

 if (state==target_specified)
   {// We aren't running
    // Use a temporal breakpoint
    char buf[32];
    snprintf(buf,32,"*%p",addr);
    mi_bkpt *b=Breakpoint(buf,true);
    if (b)
      {
       mi_free_bkpt(b);
       waitingTempBkpt=1;
       res=Run();
      }
   }
 else if (state==stopped)
   {
    res=gmi_exec_until_addr(h,addr);
    if (res)
       state=running;
   }
 return res;
}


/**[txh]********************************************************************

  Description:
  Resumes execution until the end of the current funtion is reached. Only
usable when we are in the "stopped" state.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::FinishFun()
{
 if (state!=stopped)
    return 0;
 int res=gmi_exec_finish(h);
 if (res)
    state=running;
 return res;
}

/**[txh]********************************************************************

  Description:
  Returns immediately. Only usable when we are in the "stopped" state.
  
  Return: !=NULL OK, the returned frame is the current location. That's a
synchronous function.
  
***************************************************************************/

mi_frames *MIDebugger::ReturnNow()
{
 if (state!=stopped)
    return 0;
 return gmi_exec_return(h);
}

/**[txh]********************************************************************

  Description:
  Returns the current list of frames.
  
  Return: !=NULL OK, the list of frames is returned.
  
***************************************************************************/

mi_frames *MIDebugger::CallStack(bool args)
{
 if (state!=stopped)
    return 0;
 mi_frames *fr1=gmi_stack_list_frames(h);
 if (fr1 && args)
   {// Get the function arguments
    mi_frames *fr2=gmi_stack_list_arguments(h,1);
    if (fr2)
      {// Transfer them to the other list
       mi_frames *p=fr1, *p2=fr2;
       while (p2 && p)
         {
          p->args=p2->args;
          p2->args=NULL;
          p2=p2->next;
          p=p->next;
         }
       mi_free_frames(fr2);
      }
   }
 return fr1;
}

/**[txh]********************************************************************

  Description:
  Executes upto the next line, it follows function calls. The @var{inst}
argument is for assembler. If the state is "target_specified" it will go to
the first line in the main function. If the state is "stopped" will use the
next command. If successfully the state will change to "running".
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::TraceInto(bool inst)
{
 int res=0;

 if (state==target_specified)
   {// We aren't running
    // Walk to main
    return RunToMain();
   }
 if (state==stopped)
   {
    if (inst)
       res=gmi_exec_step_instruction(h);
    else
       res=gmi_exec_step(h);
    if (res)
       state=running;
   }
 return res;
}

/**[txh]********************************************************************

  Description:
  Evaluates the provided expression. If we get an error the error
description is returned instead. Can't be called if "disconnected" or
"running".
  
  Return: The result of the expression (use free) or NULL.
  
***************************************************************************/

char *MIDebugger::EvalExpression(const char *exp)
{
 if (state==disconnected ||
     state==running) // No async :-(
    return NULL;
 // Evaluate it
 mi_error=MI_OK;
 char *res=gmi_data_evaluate_expression(h,exp);
 if (!res && mi_error_from_gdb)
   {// Not valid, return the error
    res=strdup(mi_error_from_gdb);
   }
 return res;
}

/**[txh]********************************************************************

  Description:
  Modifies the provided expression. If we get an error the error
description is returned instead. Can't be called if "disconnected" or
"running".
  
  Return: The result of the expression (use free) or NULL.
  
***************************************************************************/

char *MIDebugger::ModifyExpression(char *exp, char *newVal)
{
 if (state==disconnected ||
     state==running) // No async :-(
    return NULL;
 // Create an assignment
 int l1=strlen(exp);
 int l2=strlen(newVal);
 char b[l1+l2+2], *s=b;
 memcpy(s,exp,l1);
 s+=l1;
 *s='=';
 memcpy(++s,newVal,l2);
 s[l2]=0;
 // Evaluate it
 char *res=gmi_data_evaluate_expression(h,b);
 if (!res && mi_error_from_gdb)
   {// Not valid, return the error
    res=strdup(mi_error_from_gdb);
   }
 return res;
}

/**[txh]********************************************************************

  Description:
  Sends a command to gdb.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::Send(const char *command)
{
 if (state==disconnected ||
     state==running) // No async :-(
    return 0;
 // TODO: detect and use -interpreter-exec?
 mi_send(h,"%s\n",command);
 return mi_res_simple_done(h);
}


/**[txh]********************************************************************

  Description:
  Fills the type and value fields of the mi_gvar provided list.
  
  Return: !=0 OK
  
***************************************************************************/

int MIDebugger::FillTypeVal(mi_gvar *var)
{
 while (var)
   {
    if (!var->type && !gmi_var_info_type(h,var))
       return 0;
    if (!var->value && !gmi_var_evaluate_expression(h,var))
       return 0;
    var=var->next;
   }
 return 1;
}

int MIDebugger::FillOneTypeVal(mi_gvar *var)
{
 if (!var)
    return 0;

 int ok=1;
 if (!var->type && !gmi_var_info_type(h,var))
   {
    var->type=strdup("");
    ok=0;
   }
 if (!var->value && !gmi_var_evaluate_expression(h,var))
   {
    var->value=strdup("");
    ok=0;
   }
 return ok;
}

int MIDebugger::AssigngVar(mi_gvar *var, const char *exp)
{
 if (state!=stopped)
    return 0;
 return gmi_var_assign(h,var,exp);
}

char *MIDebugger::Show(const char *var)
{
 if (state==running || state==disconnected)
    return 0;
 // GDB 5.x doesn't reply all in the response record, just to the console :-(
 h->catch_console=1;
 if (h->catched_console)
   {
    free(h->catched_console);
    h->catched_console=NULL;
   }
 char *res=gmi_gdb_show(h,var);
 h->catch_console=0;
 if (!res && h->catched_console)
   {
    res=h->catched_console;
    h->catched_console=NULL;
   }
 return res;
}

MIDebugger::endianType MIDebugger::GetTargetEndian()
{
 if (targetEndian!=enUnknown)
    return targetEndian;
 if (state!=stopped && state!=target_specified)
    return enUnknown;

 char *end=Show("endian");
 if (end)
   {
    if (strstr(end,"big"))
       targetEndian=enBig;
    else if (strstr(end,"little"))
       targetEndian=enLittle;
    free(end);
   }
 return targetEndian;
}

MIDebugger::archType MIDebugger::GetTargetArchitecture()
{
 if (targetArch!=arUnknown)
    return targetArch;
 if (state!=stopped && state!=target_specified)
    return arUnknown;

 char *end=Show("architecture");
 if (end)
   {
    if (strstr(end,"i386"))
       targetArch=arIA32;
    else if (strstr(end,"sparc"))
       targetArch=arSPARC;
    else if (strstr(end,"pic14"))
       targetArch=arPIC14;
    else if (strstr(end,"avr"))
       targetArch=arAVR;
    free(end);
   }
 return targetArch;
}

int MIDebugger::GetErrorNumberSt()
{
 if (mi_error==MI_GDB_DIED)
   {
    state=target_specified;
    TargetUnselect();
    state=connected;
    Disconnect();
   }
 return mi_error;
}

int MIDebugger::UpdateRegisters(mi_chg_reg *regs)
{
 int updated=0;
 mi_chg_reg *chg=GetChangedRegisters();
 if (chg)
   {
    mi_chg_reg *r=regs, *c;
    while (r)
      {
       c=chg;
       while (c && c->reg!=r->reg)
          c=c->next;
       if (c)
         {
          r->updated=1;
          free(r->val);
          r->val=c->val;
          c->val=NULL;
          updated++;
         }
       else
          r->updated=0;
       r=r->next;
      }
   }
 return updated;
}