kdbg/gdbdriver.cpp

   1 /*
   2  * Copyright Johannes Sixt
   3  * This file is licensed under the GNU General Public License Version 2.
   4  * See the file COPYING in the toplevel directory of the source directory.
   5  */
   6
   7 #include "gdbdriver.h"
   8 #include "exprwnd.h"
   9 #include <QFileInfo>
  10 #include <QRegExp>
  11 #include <QStringList>
  12 #include <klocale.h>                    /* i18n */
  13 #include <ctype.h>
  14 #include <signal.h>
  15 #include <stdlib.h>                     /* strtol, atoi */
  16 #include <string.h>                     /* strcpy */
  17
  18 #include "assert.h"
  19 #include "mydebug.h"
  20
  21 static void skipString(const char*& p);
  22 static void skipNested(const char*& s, char opening, char closing);
  23 static ExprValue* parseVar(const char*& s);
  24 static bool parseName(const char*& s, QString& name, VarTree::NameKind& kind);
  25 static bool parseValue(const char*& s, ExprValue* variable);
  26 static bool parseNested(const char*& s, ExprValue* variable);
  27 static bool parseVarSeq(const char*& s, ExprValue* variable);
  28 static bool parseValueSeq(const char*& s, ExprValue* variable);
  29
  30 #define PROMPT "(kdbg)"
  31 #define PROMPT_LEN 6
  32
  33 // TODO: make this cmd info stuff non-static to allow multiple
  34 // simultaneous gdbs to run!
  35
  36 struct GdbCmdInfo {
  37     DbgCommand cmd;
  38     const char* fmt;                    /* format string */
  39     enum Args {
  40         argNone, argString, argNum,
  41         argStringNum, argNumString,
  42         argString2, argNum2
  43     } argsNeeded;
  44 };
  45
  46 #if 0
  47 // This is  how the QString data print statement generally looks like.
  48 // It is set by KDebugger via setPrintQStringDataCmd().
  49
  50 static const char printQStringStructFmt[] =
  51                 // if the string data is junk, fail early
  52                 "print ($qstrunicode=($qstrdata=(%s))->unicode)?"
  53                 // print an array of shorts
  54                 "(*(unsigned short*)$qstrunicode)@"
  55                 // limit the length
  56                 "(($qstrlen=(unsigned int)($qstrdata->len))>100?100:$qstrlen)"
  57                 // if unicode data is 0, report a special value
  58                 ":1==0\n";
  59 #endif
  60 static const char printQStringStructFmt[] = "print (0?\"%s\":$kdbgundef)\n";
  61
  62 /*
  63  * The following array of commands must be sorted by the DC* values,
  64  * because they are used as indices.
  65  */
  66 static GdbCmdInfo cmds[] = {
  67     { DCinitialize, "", GdbCmdInfo::argNone },
  68     { DCtty, "tty %s\n", GdbCmdInfo::argString },
  69     { DCexecutable, "file \"%s\"\n", GdbCmdInfo::argString },
  70     { DCtargetremote, "target remote %s\n", GdbCmdInfo::argString },
  71 #ifdef __FreeBSD__
  72     { DCcorefile, "target FreeBSD-core %s\n", GdbCmdInfo::argString },
  73 #else
  74     { DCcorefile, "target core %s\n", GdbCmdInfo::argString },
  75 #endif
  76     { DCattach, "attach %s\n", GdbCmdInfo::argString },
  77     { DCinfolinemain, "kdbg_infolinemain\n", GdbCmdInfo::argNone },
  78     { DCinfolocals, "kdbg__alllocals\n", GdbCmdInfo::argNone },
  79     { DCinforegisters, "info all-registers\n", GdbCmdInfo::argNone},
  80     { DCexamine, "x %s %s\n", GdbCmdInfo::argString2 },
  81     { DCinfoline, "info line %s:%d\n", GdbCmdInfo::argStringNum },
  82     { DCdisassemble, "disassemble %s %s\n", GdbCmdInfo::argString2 },
  83     { DCsetargs, "set args %s\n", GdbCmdInfo::argString },
  84     { DCsetenv, "set env %s %s\n", GdbCmdInfo::argString2 },
  85     { DCunsetenv, "unset env %s\n", GdbCmdInfo::argString },
  86     { DCsetoption, "setoption %s %d\n", GdbCmdInfo::argStringNum},
  87     { DCcd, "cd %s\n", GdbCmdInfo::argString },
  88     { DCbt, "bt\n", GdbCmdInfo::argNone },
  89     { DCrun, "run\n", GdbCmdInfo::argNone },
  90     { DCcont, "cont\n", GdbCmdInfo::argNone },
  91     { DCstep, "step\n", GdbCmdInfo::argNone },
  92     { DCstepi, "stepi\n", GdbCmdInfo::argNone },
  93     { DCnext, "next\n", GdbCmdInfo::argNone },
  94     { DCnexti, "nexti\n", GdbCmdInfo::argNone },
  95     { DCfinish, "finish\n", GdbCmdInfo::argNone },
  96     { DCuntil, "until %s:%d\n", GdbCmdInfo::argStringNum },
  97     { DCkill, "kill\n", GdbCmdInfo::argNone },
  98     { DCdetach, "detach\n", GdbCmdInfo::argNone },
  99     { DCbreaktext, "break %s\n", GdbCmdInfo::argString },
 100     { DCbreakline, "break %s:%d\n", GdbCmdInfo::argStringNum },
 101     { DCtbreakline, "tbreak %s:%d\n", GdbCmdInfo::argStringNum },
 102     { DCbreakaddr, "break *%s\n", GdbCmdInfo::argString },
 103     { DCtbreakaddr, "tbreak *%s\n", GdbCmdInfo::argString },
 104     { DCwatchpoint, "watch %s\n", GdbCmdInfo::argString },
 105     { DCdelete, "delete %d\n", GdbCmdInfo::argNum },
 106     { DCenable, "enable %d\n", GdbCmdInfo::argNum },
 107     { DCdisable, "disable %d\n", GdbCmdInfo::argNum },
 108     { DCprint, "print %s\n", GdbCmdInfo::argString },
 109     { DCprintDeref, "print *(%s)\n", GdbCmdInfo::argString },
 110     { DCprintStruct, "print %s\n", GdbCmdInfo::argString },
 111     { DCprintQStringStruct, printQStringStructFmt, GdbCmdInfo::argString},
 112     { DCprintPopup, "print %s\n", GdbCmdInfo::argString },
 113     { DCframe, "frame %d\n", GdbCmdInfo::argNum },
 114     { DCfindType, "whatis %s\n", GdbCmdInfo::argString },
 115     { DCinfosharedlib, "info sharedlibrary\n", GdbCmdInfo::argNone },
 116     { DCthread, "thread %d\n", GdbCmdInfo::argNum },
 117     { DCinfothreads, "info threads\n", GdbCmdInfo::argNone },
 118     { DCinfobreak, "info breakpoints\n", GdbCmdInfo::argNone },
 119     { DCcondition, "condition %d %s\n", GdbCmdInfo::argNumString},
 120     { DCsetpc, "set variable $pc=%s\n", GdbCmdInfo::argString },
 121     { DCignore, "ignore %d %d\n", GdbCmdInfo::argNum2},
 122     { DCprintWChar, "print ($s=%s)?*$s@wcslen($s):0x0\n", GdbCmdInfo::argString },
 123     { DCsetvariable, "set variable %s=%s\n", GdbCmdInfo::argString2 },
 124 };
 125
 126 #define NUM_CMDS (int(sizeof(cmds)/sizeof(cmds[0])))
 127 #define MAX_FMTLEN 200
 128
 129 GdbDriver::GdbDriver() :
 130         DebuggerDriver()
 131 {
 132 #ifndef NDEBUG
 133     // check command info array
 134     const char* perc;
 135     for (int i = 0; i < NUM_CMDS; i++) {
 136         // must be indexable by DbgCommand values, i.e. sorted by DbgCommand values
 137         assert(i == cmds[i].cmd);
 138         // a format string must be associated
 139         assert(cmds[i].fmt != 0);
 140         assert(strlen(cmds[i].fmt) <= MAX_FMTLEN);
 141         // format string must match arg specification
 142         switch (cmds[i].argsNeeded) {
 143         case GdbCmdInfo::argNone:
 144             assert(strchr(cmds[i].fmt, '%') == 0);
 145             break;
 146         case GdbCmdInfo::argString:
 147             perc = strchr(cmds[i].fmt, '%');
 148             assert(perc != 0 && perc[1] == 's');
 149             assert(strchr(perc+2, '%') == 0);
 150             break;
 151         case GdbCmdInfo::argNum:
 152             perc = strchr(cmds[i].fmt, '%');
 153             assert(perc != 0 && perc[1] == 'd');
 154             assert(strchr(perc+2, '%') == 0);
 155             break;
 156         case GdbCmdInfo::argStringNum:
 157             perc = strchr(cmds[i].fmt, '%');
 158             assert(perc != 0 && perc[1] == 's');
 159             perc = strchr(perc+2, '%');
 160             assert(perc != 0 && perc[1] == 'd');
 161             assert(strchr(perc+2, '%') == 0);
 162             break;
 163         case GdbCmdInfo::argNumString:
 164             perc = strchr(cmds[i].fmt, '%');
 165             assert(perc != 0 && perc[1] == 'd');
 166             perc = strchr(perc+2, '%');
 167             assert(perc != 0 && perc[1] == 's');
 168             assert(strchr(perc+2, '%') == 0);
 169             break;
 170         case GdbCmdInfo::argString2:
 171             perc = strchr(cmds[i].fmt, '%');
 172             assert(perc != 0 && perc[1] == 's');
 173             perc = strchr(perc+2, '%');
 174             assert(perc != 0 && perc[1] == 's');
 175             assert(strchr(perc+2, '%') == 0);
 176             break;
 177         case GdbCmdInfo::argNum2:
 178             perc = strchr(cmds[i].fmt, '%');
 179             assert(perc != 0 && perc[1] == 'd');
 180             perc = strchr(perc+2, '%');
 181             assert(perc != 0 && perc[1] == 'd');
 182             assert(strchr(perc+2, '%') == 0);
 183             break;
 184         }
 185     }
 186     assert(strlen(printQStringStructFmt) <= MAX_FMTLEN);
 187 #endif
 188 }
 189
 190 GdbDriver::~GdbDriver()
 191 {
 192 }
 193
 194
 195 QString GdbDriver::driverName() const
 196 {
 197     return "GDB";
 198 }
 199
 200 QString GdbDriver::defaultGdb()
 201 {
 202     return
 203         "gdb"
 204         " --fullname"   /* to get standard file names each time the prog stops */
 205         " --nx";        /* do not execute initialization files */
 206 }
 207
 208 QString GdbDriver::defaultInvocation() const
 209 {
 210     if (m_defaultCmd.isEmpty()) {
 211         return defaultGdb();
 212     } else {
 213         return m_defaultCmd;
 214     }
 215 }
 216
 217 QStringList GdbDriver::boolOptionList() const
 218 {
 219     // no options
 220     return QStringList();
 221 }
 222
 223 bool GdbDriver::startup(QString cmdStr)
 224 {
 225     if (!DebuggerDriver::startup(cmdStr))
 226         return false;
 227
 228     static const char gdbInitialize[] =
 229         /*
 230          * Work around buggy gdbs that do command line editing even if they
 231          * are not on a tty. The readline library echos every command back
 232          * in this case, which is confusing for us.
 233          */
 234         "set editing off\n"
 235         "set confirm off\n"
 236         "set print static-members off\n"
 237         "set print asm-demangle on\n"
 238         /*
 239          * Sometimes, gdb prints [New Thread ...] during 'info threads';
 240          * we will not look at thread events anyway, so turn them off.
 241          */
 242         "set print thread-events off\n"
 243         /*
 244          * We do not want Python pretty printer support, because their
 245          * output is unpredictable, and we cannot parse it.
 246          */
 247         "set auto-load python off\n"
 248         /*
 249          * Nevertheless, some Python messages get through, for example,
 250          * when a backtrace is printed without the Python gdb module loaded.
 251          */
 252         "set python print-stack none\n"
 253         /*
 254          * Don't assume that program functions invoked from a watch expression
 255          * always succeed.
 256          */
 257         "set unwindonsignal on\n"
 258         /*
 259          * Write a short macro that prints all locals: local variables and
 260          * function arguments.
 261          */
 262         "define kdbg__alllocals\n"
 263         "info locals\n"                 /* local vars supersede args with same name */
 264         "info args\n"                   /* therefore, arguments must come last */
 265         "end\n"
 266         /*
 267          * Work around a bug in gdb-6.3: "info line main" crashes gdb.
 268          */
 269         "define kdbg_infolinemain\n"
 270         "list\n"
 271         "info line\n"
 272         "end\n"
 273         // change prompt string and synchronize with gdb
 274         "set prompt " PROMPT "\n"
 275         ;
 276
 277     executeCmdString(DCinitialize, gdbInitialize, false);
 278
 279     // assume that QString::null is ok
 280     cmds[DCprintQStringStruct].fmt = printQStringStructFmt;
 281
 282     return true;
 283 }
 284
 285 void GdbDriver::commandFinished(CmdQueueItem* cmd)
 286 {
 287     // command string must be committed
 288     if (!cmd->m_committed) {
 289         // not commited!
 290         TRACE("calling " + (__PRETTY_FUNCTION__ + (" with uncommited command:\n\t" +
 291               cmd->m_cmdString)));
 292         return;
 293     }
 294
 295     switch (cmd->m_cmd) {
 296     case DCinitialize:
 297         {
 298             /*
 299              * Check for GDB 7.1 or later; the syntax for the disassemble
 300              * command has changed.
 301              * This RE picks the last version number in the first line,
 302              * because at least OpenSUSE writes its own version number
 303              * in the first line (but before GDB's version number).
 304              */
 305             QRegExp re(
 306                 " "                     // must be preceded by space
 307                 "[(]?"                  // SLES 10 embeds in parentheses
 308                 "(\\d+)\\.(\\d+)"       // major, minor
 309                 "[^ ]*\\n"              // no space until end of line
 310                 );
 311             int pos = re.indexIn(m_output);
 312             const char* disass = "disassemble %s %s\n";
 313             if (pos >= 0) {
 314                 int major = re.cap(1).toInt();
 315                 int minor = re.cap(2).toInt();
 316                 if (major > 7 || (major == 7 && minor >= 1))
 317                 {
 318                     disass = "disassemble %s, %s\n";
 319                 }
 320             }
 321             cmds[DCdisassemble].fmt = disass;
 322         }
 323         break;
 324     default:;
 325     }
 326
 327     /* ok, the command is ready */
 328     emit commandReceived(cmd, m_output.constData());
 329
 330     switch (cmd->m_cmd) {
 331     case DCcorefile:
 332     case DCinfolinemain:
 333     case DCinfoline:
 334     case DCframe:
 335     case DCattach:
 336     case DCrun:
 337     case DCcont:
 338     case DCstep:
 339     case DCstepi:
 340     case DCnext:
 341     case DCnexti:
 342     case DCfinish:
 343     case DCuntil:
 344         parseMarker(cmd);
 345     default:;
 346     }
 347 }
 348
 349 int GdbDriver::findPrompt(const QByteArray& output) const
 350 {
 351     /*
 352      * If there's a prompt string in the collected output, it must be at
 353      * the very end.
 354      *
 355      * Note: It could nevertheless happen that a character sequence that is
 356      * equal to the prompt string appears at the end of the output,
 357      * although it is very, very unlikely (namely as part of a string that
 358      * lingered in gdb's output buffer due to some timing/heavy load
 359      * conditions for a very long time such that that buffer overflowed
 360      * exactly at the end of the prompt string look-a-like).
 361      */
 362     int len = output.length();
 363     if (len >= PROMPT_LEN &&
 364         strncmp(output.data()+len-PROMPT_LEN, PROMPT, PROMPT_LEN) == 0)
 365     {
 366         return len-PROMPT_LEN;
 367     }
 368     return -1;
 369 }
 370
 371 /*
 372  * The --fullname option makes gdb send a special normalized sequence print
 373  * each time the program stops and at some other points. The sequence has
 374  * the form "\032\032filename:lineno:charoffset:(beg|middle):address".
 375  */
 376 void GdbDriver::parseMarker(CmdQueueItem* cmd)
 377 {
 378     char* startMarker = strstr(m_output.data(), "\032\032");
 379     if (startMarker == 0)
 380         return;
 381
 382     // extract the marker
 383     startMarker += 2;
 384     TRACE(QString("found marker: ") + startMarker);
 385     char* endMarker = strchr(startMarker, '\n');
 386     if (endMarker == 0)
 387         return;
 388
 389     *endMarker = '\0';
 390
 391     // extract filename and line number
 392     static QRegExp MarkerRE(":(\\d+):\\d+:[begmidl]+:0x");
 393
 394     int lineNoStart = MarkerRE.indexIn(startMarker);
 395     if (lineNoStart >= 0) {
 396         int lineNo = MarkerRE.cap(1).toInt();
 397
 398         // get address unless there is one in cmd
 399         DbgAddr address = cmd->m_addr;
 400         if (address.isEmpty()) {
 401             const char* addrStart = startMarker + lineNoStart +
 402                                     MarkerRE.matchedLength() - 2;
 403             address = QString(addrStart).trimmed();
 404         }
 405
 406         // now show the window
 407         startMarker[lineNoStart] = '\0';   /* split off file name */
 408         emit activateFileLine(startMarker, lineNo-1, address);
 409     }
 410 }
 411
 412
 413 /*
 414  * Escapes characters that might lead to problems when they appear on gdb's
 415  * command line.
 416  */
 417 static void normalizeStringArg(QString& arg)
 418 {
 419     /*
 420      * Remove trailing backslashes. This approach is a little simplistic,
 421      * but we know that there is at the moment no case where a trailing
 422      * backslash would make sense.
 423      */
 424     while (!arg.isEmpty() && arg[arg.length()-1] == '\\') {
 425         arg = arg.left(arg.length()-1);
 426     }
 427 }
 428
 429
 430 QString GdbDriver::makeCmdString(DbgCommand cmd, QString strArg)
 431 {
 432     assert(cmd >= 0 && cmd < NUM_CMDS);
 433     assert(cmds[cmd].argsNeeded == GdbCmdInfo::argString);
 434
 435     normalizeStringArg(strArg);
 436
 437     if (cmd == DCcd) {
 438         // need the working directory when parsing the output
 439         m_programWD = strArg;
 440     } else if (cmd == DCsetargs && !m_redirect.isEmpty()) {
 441         /*
 442          * Use saved redirection. We prepend it in front of the user's
 443          * arguments so that the user can override the redirections.
 444         */
 445         strArg = m_redirect + " " + strArg;
 446     }
 447
 448     QString cmdString;
 449     cmdString.sprintf(cmds[cmd].fmt, strArg.toUtf8().constData());
 450     return cmdString;
 451 }
 452
 453 QString GdbDriver::makeCmdString(DbgCommand cmd, int intArg)
 454 {
 455     assert(cmd >= 0 && cmd < NUM_CMDS);
 456     assert(cmds[cmd].argsNeeded == GdbCmdInfo::argNum);
 457
 458     QString cmdString;
 459     cmdString.sprintf(cmds[cmd].fmt, intArg);
 460     return cmdString;
 461 }
 462
 463 QString GdbDriver::makeCmdString(DbgCommand cmd, QString strArg, int intArg)
 464 {
 465     assert(cmd >= 0 && cmd < NUM_CMDS);
 466     assert(cmds[cmd].argsNeeded == GdbCmdInfo::argStringNum ||
 467            cmds[cmd].argsNeeded == GdbCmdInfo::argNumString ||
 468            cmd == DCexamine ||
 469            cmd == DCtty);
 470
 471     normalizeStringArg(strArg);
 472
 473     QString cmdString;
 474
 475     if (cmd == DCtty)
 476     {
 477         /*
 478          * intArg specifies which channels should be redirected to
 479          * /dev/null. It is a value or'ed together from RDNstdin,
 480          * RDNstdout, RDNstderr. We store the value for a later DCsetargs
 481          * command.
 482          *
 483          * Note: We rely on that after the DCtty a DCsetargs will follow,
 484          * which will ultimately apply the redirection.
 485          */
 486         static const char* const runRedir[8] = {
 487             "",
 488             "</dev/null",
 489             ">/dev/null",
 490             "</dev/null >/dev/null",
 491             "2>/dev/null",
 492             "</dev/null 2>/dev/null",
 493             ">/dev/null 2>&1",
 494             "</dev/null >/dev/null 2>&1"
 495         };
 496         if (strArg.isEmpty())
 497             intArg = 7;                 /* failsafe if no tty */
 498         m_redirect = runRedir[intArg & 7];
 499
 500         return makeCmdString(DCtty, strArg);   /* note: no problem if strArg empty */
 501     }
 502
 503     if (cmd == DCexamine) {
 504         // make a format specifier from the intArg
 505         static const char size[16] = {
 506             '\0', 'b', 'h', 'w', 'g'
 507         };
 508         static const char format[16] = {
 509             '\0', 'x', 'd', 'u', 'o', 't',
 510             'a',  'c', 'f', 's', 'i'
 511         };
 512         assert(MDTsizemask == 0xf);     /* lowest 4 bits */
 513         assert(MDTformatmask == 0xf0);  /* next 4 bits */
 514         int count = 16;                 /* number of entities to print */
 515         char sizeSpec = size[intArg & MDTsizemask];
 516         char formatSpec = format[(intArg & MDTformatmask) >> 4];
 517         assert(sizeSpec != '\0');
 518         assert(formatSpec != '\0');
 519         // adjust count such that 16 lines are printed
 520         switch (intArg & MDTformatmask) {
 521         case MDTstring: case MDTinsn:
 522             break;                      /* no modification needed */
 523         default:
 524             // all cases drop through:
 525             switch (intArg & MDTsizemask) {
 526             case MDTbyte:
 527             case MDThalfword:
 528                 count *= 2;
 529             case MDTword:
 530                 count *= 2;
 531             case MDTgiantword:
 532                 count *= 2;
 533             }
 534             break;
 535         }
 536         QString spec;
 537         spec.sprintf("/%d%c%c", count, sizeSpec, formatSpec);
 538
 539         return makeCmdString(DCexamine, spec, strArg);
 540     }
 541
 542     if (cmds[cmd].argsNeeded == GdbCmdInfo::argStringNum)
 543     {
 544         // line numbers are zero-based
 545         if (cmd == DCuntil || cmd == DCbreakline ||
 546             cmd == DCtbreakline || cmd == DCinfoline)
 547         {
 548             intArg++;
 549         }
 550         if (cmd == DCinfoline)
 551         {
 552             // must split off file name part
 553             strArg = QFileInfo(strArg).fileName();
 554         }
 555         cmdString.sprintf(cmds[cmd].fmt, strArg.toUtf8().constData(), intArg);
 556     }
 557     else
 558     {
 559         cmdString.sprintf(cmds[cmd].fmt, intArg, strArg.toUtf8().constData());
 560     }
 561     return cmdString;
 562 }
 563
 564 QString GdbDriver::makeCmdString(DbgCommand cmd, QString strArg1, QString strArg2)
 565 {
 566     assert(cmd >= 0 && cmd < NUM_CMDS);
 567     assert(cmds[cmd].argsNeeded == GdbCmdInfo::argString2);
 568
 569     normalizeStringArg(strArg1);
 570     normalizeStringArg(strArg2);
 571
 572     QString cmdString;
 573     cmdString.sprintf(cmds[cmd].fmt,
 574                       strArg1.toUtf8().constData(),
 575                       strArg2.toUtf8().constData());
 576     return cmdString;
 577 }
 578
 579 QString GdbDriver::makeCmdString(DbgCommand cmd, int intArg1, int intArg2)
 580 {
 581     assert(cmd >= 0 && cmd < NUM_CMDS);
 582     assert(cmds[cmd].argsNeeded == GdbCmdInfo::argNum2);
 583
 584     QString cmdString;
 585     cmdString.sprintf(cmds[cmd].fmt, intArg1, intArg2);
 586     return cmdString;
 587 }
 588
 589 CmdQueueItem* GdbDriver::executeCmd(DbgCommand cmd, bool clearLow)
 590 {
 591     assert(cmd >= 0 && cmd < NUM_CMDS);
 592     assert(cmds[cmd].argsNeeded == GdbCmdInfo::argNone);
 593
 594     if (cmd == DCrun) {
 595         m_haveCoreFile = false;
 596     }
 597
 598     return executeCmdString(cmd, cmds[cmd].fmt, clearLow);
 599 }
 600
 601 CmdQueueItem* GdbDriver::executeCmd(DbgCommand cmd, QString strArg,
 602                                     bool clearLow)
 603 {
 604     return executeCmdString(cmd, makeCmdString(cmd, strArg), clearLow);
 605 }
 606
 607 CmdQueueItem* GdbDriver::executeCmd(DbgCommand cmd, int intArg,
 608                                     bool clearLow)
 609 {
 610
 611     return executeCmdString(cmd, makeCmdString(cmd, intArg), clearLow);
 612 }
 613
 614 CmdQueueItem* GdbDriver::executeCmd(DbgCommand cmd, QString strArg, int intArg,
 615                                     bool clearLow)
 616 {
 617     return executeCmdString(cmd, makeCmdString(cmd, strArg, intArg), clearLow);
 618 }
 619
 620 CmdQueueItem* GdbDriver::executeCmd(DbgCommand cmd, QString strArg1, QString strArg2,
 621                                     bool clearLow)
 622 {
 623     return executeCmdString(cmd, makeCmdString(cmd, strArg1, strArg2), clearLow);
 624 }
 625
 626 CmdQueueItem* GdbDriver::executeCmd(DbgCommand cmd, int intArg1, int intArg2,
 627                                     bool clearLow)
 628 {
 629     return executeCmdString(cmd, makeCmdString(cmd, intArg1, intArg2), clearLow);
 630 }
 631
 632 CmdQueueItem* GdbDriver::queueCmd(DbgCommand cmd, QueueMode mode)
 633 {
 634     return queueCmdString(cmd, cmds[cmd].fmt, mode);
 635 }
 636
 637 CmdQueueItem* GdbDriver::queueCmd(DbgCommand cmd, QString strArg,
 638                                   QueueMode mode)
 639 {
 640     return queueCmdString(cmd, makeCmdString(cmd, strArg), mode);
 641 }
 642
 643 CmdQueueItem* GdbDriver::queueCmd(DbgCommand cmd, int intArg,
 644                                   QueueMode mode)
 645 {
 646     return queueCmdString(cmd, makeCmdString(cmd, intArg), mode);
 647 }
 648
 649 CmdQueueItem* GdbDriver::queueCmd(DbgCommand cmd, QString strArg, int intArg,
 650                                   QueueMode mode)
 651 {
 652     return queueCmdString(cmd, makeCmdString(cmd, strArg, intArg), mode);
 653 }
 654
 655 CmdQueueItem* GdbDriver::queueCmd(DbgCommand cmd, QString strArg1, QString strArg2,
 656                                   QueueMode mode)
 657 {
 658     return queueCmdString(cmd, makeCmdString(cmd, strArg1, strArg2), mode);
 659 }
 660
 661 void GdbDriver::terminate()
 662 {
 663     if (m_state != DSidle)
 664     {
 665         ::kill(pid(), SIGINT);
 666         m_state = DSinterrupted;
 667     }
 668     flushCommands();
 669     closeWriteChannel();
 670 }
 671
 672 void GdbDriver::detachAndTerminate()
 673 {
 674     ::kill(pid(), SIGINT);
 675     flushCommands();
 676     executeCmdString(DCinitialize, "detach\nquit\n", true);
 677 }
 678
 679 void GdbDriver::interruptInferior()
 680 {
 681     ::kill(pid(), SIGINT);
 682     // remove accidentally queued commands
 683     flushHiPriQueue();
 684 }
 685
 686 static bool isErrorExpr(const char* output)
 687 {
 688     return
 689         strncmp(output, "Cannot access memory at", 23) == 0 ||
 690         strncmp(output, "Attempt to dereference a generic pointer", 40) == 0 ||
 691         strncmp(output, "Attempt to take contents of ", 28) == 0 ||
 692         strncmp(output, "Attempt to use a type name as an expression", 43) == 0 ||
 693         strncmp(output, "There is no member or method named", 34) == 0 ||
 694         strncmp(output, "A parse error in expression", 27) == 0 ||
 695         strncmp(output, "No symbol \"", 11) == 0 ||
 696         strncmp(output, "Internal error: ", 16) == 0;
 697 }
 698
 699 /**
 700  * Returns true if the output is an error message. If wantErrorValue is
 701  * true, a new ExprValue object is created and filled with the error message.
 702  * If there are warnings, they are skipped and output points past the warnings
 703  * on return (even if there \e are errors).
 704  */
 705 static bool parseErrorMessage(const char*& output,
 706                               ExprValue*& variable, bool wantErrorValue)
 707 {
 708     while (isspace(*output))
 709         output++;
 710
 711     // skip warnings
 712     while (strncmp(output, "warning:", 8) == 0)
 713     {
 714         const char* end = strchr(output+8, '\n');
 715         if (end == 0)
 716             output += strlen(output);
 717         else
 718             output = end+1;
 719         while (isspace(*output))
 720             output++;
 721     }
 722
 723     if (isErrorExpr(output))
 724     {
 725         if (wantErrorValue) {
 726             // put the error message as value in the variable
 727             variable = new ExprValue(QString(), VarTree::NKplain);
 728             const char* endMsg = strchr(output, '\n');
 729             if (endMsg == 0)
 730                 endMsg = output + strlen(output);
 731             variable->m_value = QString::fromLatin1(output, endMsg-output);
 732         } else {
 733             variable = 0;
 734         }
 735         return true;
 736     }
 737     return false;
 738 }
 739
 740 #if QT_VERSION >= 300
 741 union Qt2QChar {
 742     short s;
 743     struct {
 744         uchar row;
 745         uchar cell;
 746     } qch;
 747 };
 748 #endif
 749
 750 void GdbDriver::setPrintQStringDataCmd(const char* cmd)
 751 {
 752     // don't accept the command if it is empty
 753     if (cmd == 0 || *cmd == '\0')
 754         return;
 755     assert(strlen(cmd) <= MAX_FMTLEN);
 756     cmds[DCprintQStringStruct].fmt = cmd;
 757 }
 758
 759 ExprValue* GdbDriver::parseQCharArray(const char* output, bool wantErrorValue, bool qt3like)
 760 {
 761     ExprValue* variable = 0;
 762
 763     /*
 764      * Parse off white space. gdb sometimes prints white space first if the
 765      * printed array leaded to an error.
 766      */
 767     while (isspace(*output))
 768         output++;
 769
 770     // special case: empty string (0 repetitions)
 771     if (strncmp(output, "Invalid number 0 of repetitions", 31) == 0)
 772     {
 773         variable = new ExprValue(QString(), VarTree::NKplain);
 774         variable->m_value = "\"\"";
 775         return variable;
 776     }
 777
 778     // check for error conditions
 779     if (parseErrorMessage(output, variable, wantErrorValue))
 780         return variable;
 781
 782     // parse the array
 783
 784     // find '='
 785     const char* p = output;
 786     p = strchr(p, '=');
 787     if (p == 0) {
 788         goto error;
 789     }
 790     // skip white space
 791     do {
 792         p++;
 793     } while (isspace(*p));
 794
 795     if (*p == '{')
 796     {
 797         // this is the real data
 798         p++;                            /* skip '{' */
 799
 800         // parse the array
 801         QString result;
 802         QString repeatCount;
 803         enum { wasNothing, wasChar, wasRepeat } lastThing = wasNothing;
 804         /*
 805          * A matrix for separators between the individual "things"
 806          * that are added to the string. The first index is a bool,
 807          * the second index is from the enum above.
 808          */
 809         static const char* separator[2][3] = {
 810             { "\"", 0,       ", \"" },  /* normal char is added */
 811             { "'",  "\", '", ", '" }    /* repeated char is added */
 812         };
 813
 814         while (isdigit(*p)) {
 815             // parse a number
 816             char* end;
 817             unsigned short value = (unsigned short) strtoul(p, &end, 0);
 818             if (end == p)
 819                 goto error;             /* huh? no valid digits */
 820             // skip separator and search for a repeat count
 821             p = end;
 822             while (isspace(*p) || *p == ',')
 823                 p++;
 824             bool repeats = strncmp(p, "<repeats ", 9) == 0;
 825             if (repeats) {
 826                 const char* start = p;
 827                 p = strchr(p+9, '>');   /* search end and advance */
 828                 if (p == 0)
 829                     goto error;
 830                 p++;                    /* skip '>' */
 831                 repeatCount = QString::fromLatin1(start, p-start);
 832                 while (isspace(*p) || *p == ',')
 833                     p++;
 834             }
 835             // p is now at the next char (or the end)
 836
 837             // interpret the value as a QChar
 838             // TODO: make cross-architecture compatible
 839             QChar ch;
 840             if (qt3like) {
 841                 ch = QChar(value);
 842             } else {
 843 #if QT_VERSION < 300
 844                 (unsigned short&)ch = value;
 845 #else
 846                 Qt2QChar c;
 847                 c.s = value;
 848                 ch.setRow(c.qch.row);
 849                 ch.setCell(c.qch.cell);
 850 #endif
 851             }
 852
 853             // escape a few frequently used characters
 854             char escapeCode = '\0';
 855             switch (ch.toLatin1()) {
 856             case '\n': escapeCode = 'n'; break;
 857             case '\r': escapeCode = 'r'; break;
 858             case '\t': escapeCode = 't'; break;
 859             case '\b': escapeCode = 'b'; break;
 860             case '\"': escapeCode = '\"'; break;
 861             case '\\': escapeCode = '\\'; break;
 862             case '\0': if (value == 0) { escapeCode = '0'; } break;
 863             }
 864
 865             // add separator
 866             result += separator[repeats][lastThing];
 867             // add char
 868             if (escapeCode != '\0') {
 869                 result += '\\';
 870                 ch = escapeCode;
 871             }
 872             result += ch;
 873
 874             // fixup repeat count and lastThing
 875             if (repeats) {
 876                 result += "' ";
 877                 result += repeatCount;
 878                 lastThing = wasRepeat;
 879             } else {
 880                 lastThing = wasChar;
 881             }
 882         }
 883         if (*p != '}')
 884             goto error;
 885
 886         // closing quote
 887         if (lastThing == wasChar)
 888             result += "\"";
 889
 890         // assign the value
 891         variable = new ExprValue(QString(), VarTree::NKplain);
 892         variable->m_value = result;
 893     }
 894     else if (strncmp(p, "true", 4) == 0)
 895     {
 896         variable = new ExprValue(QString(), VarTree::NKplain);
 897         variable->m_value = "QString::null";
 898     }
 899     else if (strncmp(p, "false", 5) == 0)
 900     {
 901         variable = new ExprValue(QString(), VarTree::NKplain);
 902         variable->m_value = "(null)";
 903     }
 904     else
 905         goto error;
 906     return variable;
 907
 908 error:
 909     if (wantErrorValue) {
 910         variable = new ExprValue(QString(), VarTree::NKplain);
 911         variable->m_value = "internal parse error";
 912     }
 913     return variable;
 914 }
 915
 916 static ExprValue* parseVar(const char*& s)
 917 {
 918     const char* p = s;
 919
 920     // skip whitespace
 921     while (isspace(*p))
 922         p++;
 923
 924     QString name;
 925     VarTree::NameKind kind;
 926     /*
 927      * Detect anonymouse struct values: The 'name =' part is missing:
 928      *    s = { a = 1, { b = 2 }}
 929      * Note that this detection works only inside structs when the anonymous
 930      * struct is not the first member:
 931      *    s = {{ a = 1 }, b = 2}
 932      * This is misparsed (by parseNested()) because it is mistakenly
 933      * interprets the second opening brace as the first element of an array
 934      * of structs.
 935      */
 936     if (*p == '{')
 937     {
 938         name = i18n("<anonymous struct or union>");
 939         kind = VarTree::NKanonymous;
 940     }
 941     else
 942     {
 943         if (!parseName(p, name, kind)) {
 944             return 0;
 945         }
 946
 947         // go for '='
 948         while (isspace(*p))
 949             p++;
 950         if (*p != '=') {
 951             TRACE("parse error: = not found after " + name);
 952             return 0;
 953         }
 954         // skip the '=' and more whitespace
 955         p++;
 956         while (isspace(*p))
 957             p++;
 958     }
 959
 960     ExprValue* variable = new ExprValue(name, kind);
 961
 962     if (!parseValue(p, variable)) {
 963         delete variable;
 964         return 0;
 965     }
 966     s = p;
 967     return variable;
 968 }
 969
 970 static void skipNested(const char*& s, char opening, char closing)
 971 {
 972     const char* p = s;
 973
 974     // parse a nested type
 975     int nest = 1;
 976     p++;
 977     /*
 978      * Search for next matching `closing' char, skipping nested pairs of
 979      * `opening' and `closing'.
 980      */
 981     while (*p && nest > 0) {
 982         if (*p == opening) {
 983             nest++;
 984         } else if (*p == closing) {
 985             nest--;
 986         }
 987         p++;
 988     }
 989     if (nest != 0) {
 990         TRACE(QString().sprintf("parse error: mismatching %c%c at %-20.20s", opening, closing, s));
 991     }
 992     s = p;
 993 }
 994
 995 /**
 996  * This function skips text that is delimited by nested angle bracktes, '<>'.
 997  * A complication arises because the delimited text can contain the names of
 998  * operator<<, operator>>, operator<, and operator>, which have to be treated
 999  * specially so that they do not count towards the nesting of '<>'.
1000  * This function assumes that the delimited text does not contain strings.
1001  */
1002 static void skipNestedAngles(const char*& s)
1003 {
1004     const char* p = s;
1005
1006     int nest = 1;
1007     p++;                // skip the initial '<'
1008     while (*p && nest > 0)
1009     {
1010         // Below we can check for p-s >= 9 instead of 8 because
1011         // *s is '<' and cannot be part of "operator".
1012         if (*p == '<')
1013         {
1014             if (p-s >= 9 && strncmp(p-8, "operator", 8) == 0) {
1015                 if (p[1] == '<')
1016                     p++;
1017             } else {
1018                 nest++;
1019             }
1020         }
1021         else if (*p == '>')
1022         {
1023             if (p-s >= 9 && strncmp(p-8, "operator", 8) == 0) {
1024                 if (p[1] == '>')
1025                     p++;
1026             } else {
1027                 nest--;
1028             }
1029         }
1030         p++;
1031     }
1032     if (nest != 0) {
1033         TRACE(QString().sprintf("parse error: mismatching <> at %-20.20s", s));
1034     }
1035     s = p;
1036 }
1037
1038 /**
1039  * Find the end of line that is not inside braces
1040  */
1041 static void findEnd(const char*& s)
1042 {
1043     const char* p = s;
1044     while (*p && *p!='\n') {
1045         while (*p && *p!='\n' && *p!='{')
1046             p++;
1047         if (*p=='{') {
1048             p++;
1049             skipNested(p, '{', '}'); p--;
1050         }
1051     }
1052     s = p;
1053 }
1054
1055 static bool isNumberish(const char ch)
1056 {
1057     return (ch>='0' && ch<='9') || ch=='.' || ch=='x';
1058 }
1059
1060 void skipString(const char*& p)
1061 {
1062     // wchar_t strings begin with L
1063     if (*p == 'L')
1064         ++p;
1065
1066 moreStrings:
1067     // opening quote
1068     char quote = *p++;
1069     while (*p != quote) {
1070         if (*p == '\\') {
1071             // skip escaped character
1072             // no special treatment for octal values necessary
1073             p++;
1074         }
1075         // simply return if no more characters
1076         if (*p == '\0')
1077             return;
1078         p++;
1079     }
1080     // closing quote
1081     p++;
1082     /*
1083      * Strings can consist of several parts, some of which contain repeated
1084      * characters.
1085      */
1086     if (quote == '\'') {
1087         // look ahaead for <repeats 123 times>
1088         const char* q = p+1;
1089         while (isspace(*q))
1090             q++;
1091         if (strncmp(q, "<repeats ", 9) == 0) {
1092             p = q+9;
1093             while (*p != '\0' && *p != '>')
1094                 p++;
1095             if (*p != '\0') {
1096                 p++;                    /* skip the '>' */
1097             }
1098         }
1099     }
1100     // Is the string continued? If so, there is no L in wchar_t strings
1101     if (*p == ',')
1102     {
1103         // look ahead for another quote
1104         const char* q = p+1;
1105         while (isspace(*q))
1106             q++;
1107         if (*q == '"' || *q == '\'') {
1108             // yes!
1109             p = q;
1110             goto moreStrings;
1111         }
1112
1113         // some strings can end in <incomplete sequence ...>
1114         if (strncmp(q, "<incomplete sequence", 20) == 0)
1115         {
1116             p = q+20;
1117             while (*p != '\0' && *p != '>')
1118                 p++;
1119             if (*p != '\0') {
1120                 p++;            /* skip the '>' */
1121             }
1122         }
1123     }
1124     /*
1125      * There's a bug in gdb where it prints the beginning of the string
1126      * continuation and the comma-blank in the wrong order if the new string
1127      * begins with an incomplete multi-byte character. For now, let's check
1128      * for this in a very narrow condition, particularly, where the next
1129      * character is given in octal notation. Example:
1130      *     'a' <repeats 20 times>"\240, b"
1131      */
1132     if (*p == '"' && p[1] == '\\' && isdigit(p[2])) {
1133         int i = 3;
1134         while (isdigit(p[i]))
1135             ++i;
1136         if (p[i] == ',' && p[i+1] == ' ') {
1137             // just treat everything beginning at the dquote as string
1138             goto moreStrings;
1139         }
1140     }
1141     /* very long strings are followed by `...' */
1142     if (*p == '.' && p[1] == '.' && p[2] == '.') {
1143         p += 3;
1144     }
1145 }
1146
1147 static void skipNestedWithString(const char*& s, char opening, char closing)
1148 {
1149     const char* p = s;
1150
1151     // parse a nested expression
1152     int nest = 1;
1153     p++;
1154     /*
1155      * Search for next matching `closing' char, skipping nested pairs of
1156      * `opening' and `closing' as well as strings.
1157      */
1158     while (*p && nest > 0) {
1159         if (*p == opening) {
1160             nest++;
1161         } else if (*p == closing) {
1162             nest--;
1163         } else if (*p == '\'' || *p == '\"') {
1164             skipString(p);
1165             continue;
1166         }
1167         p++;
1168     }
1169     if (nest > 0) {
1170         TRACE(QString().sprintf("parse error: mismatching %c%c at %-20.20s", opening, closing, s));
1171     }
1172     s = p;
1173 }
1174
1175 inline void skipName(const char*& p)
1176 {
1177     // allow : (for enumeration values) and $ and . (for _vtbl.)
1178     while (isalnum(*p) || *p == '_' || *p == ':' || *p == '$' || *p == '.')
1179         p++;
1180 }
1181
1182 static bool parseName(const char*& s, QString& name, VarTree::NameKind& kind)
1183 {
1184     kind = VarTree::NKplain;
1185
1186     const char* p = s;
1187     // examples of names:
1188     //  name
1189     //  <Object>
1190     //  <string<a,b<c>,7> >
1191
1192     if (*p == '<') {
1193         skipNestedAngles(p);
1194         name = QString::fromLatin1(s, p - s);
1195         kind = VarTree::NKtype;
1196     }
1197     else
1198     {
1199         // name, which might be "static"; allow dot for "_vtbl."
1200         skipName(p);
1201         if (p == s) {
1202             TRACE(QString().sprintf("parse error: not a name %-20.20s", s));
1203             return false;
1204         }
1205         int len = p - s;
1206         if (len == 6 && strncmp(s, "static", 6) == 0) {
1207             kind = VarTree::NKstatic;
1208
1209             // its a static variable, name comes now
1210             while (isspace(*p))
1211                 p++;
1212             s = p;
1213             skipName(p);
1214             if (p == s) {
1215                 TRACE(QString().sprintf("parse error: not a name after static %-20.20s", s));
1216                 return false;
1217             }
1218             len = p - s;
1219         }
1220         name = QString::fromLatin1(s, len);
1221     }
1222     // return the new position
1223     s = p;
1224     return true;
1225 }
1226
1227 static bool parseValue(const char*& s, ExprValue* variable)
1228 {
1229     variable->m_value = "";
1230
1231 repeat:
1232     if (*s == '{') {
1233         // Sometimes we find the following output:
1234         //  {<text variable, no debug info>} 0x40012000 <access>
1235         //  {<data variable, no debug info>}
1236         //  {<variable (not text or data), no debug info>}
1237         if (strncmp(s, "{<text variable, ", 17) == 0 ||
1238             strncmp(s, "{<data variable, ", 17) == 0 ||
1239             strncmp(s, "{<variable (not text or data), ", 31) == 0)
1240         {
1241             const char* start = s;
1242             skipNested(s, '{', '}');
1243             variable->m_value = QString::fromLatin1(start, s-start);
1244             variable->m_value += ' ';   // add only a single space
1245             while (isspace(*s))
1246                 s++;
1247             goto repeat;
1248         }
1249         else
1250         {
1251             s++;
1252             if (!parseNested(s, variable)) {
1253                 return false;
1254             }
1255             // must be the closing brace
1256             if (*s != '}') {
1257                 TRACE("parse error: missing } of " +  variable->m_name);
1258                 return false;
1259             }
1260             s++;
1261             // final white space
1262             while (isspace(*s))
1263                 s++;
1264         }
1265     }
1266     // Sometimes we find a warning; it ends at the next LF
1267     else if (strncmp(s, "warning: ", 9) == 0) {
1268         const char* end = strchr(s, '\n');
1269         s = end ? end : s+strlen(s);
1270         // skip space at start of next line
1271         while (isspace(*s))
1272             s++;
1273         goto repeat;
1274     } else {
1275         // examples of leaf values (cannot be the empty string):
1276         //  123
1277         //  -123
1278         //  23.575e+37
1279         //  0x32a45
1280         //  @0x012ab4
1281         //  (DwContentType&) @0x8123456: {...}
1282         //  0x32a45 "text"
1283         //  10 '\n'
1284         //  <optimized out>
1285         //  0x823abc <Array<int> virtual table>
1286         //  0x40240f <globarstr> "test"
1287         //  (void (*)()) 0x8048480 <f(E *, char)>
1288         //  (E *) 0xbffff450
1289         //  red
1290         //  &parseP (HTMLClueV *, char *)
1291         //  Variable "x" is not available.
1292         //  The value of variable 'x' is distributed...
1293         //  -nan(0xfffff081defa0)
1294
1295         const char*p = s;
1296
1297         // check for type
1298         QString type;
1299         if (*p == '(') {
1300             skipNested(p, '(', ')');
1301
1302             while (isspace(*p))
1303                 p++;
1304             variable->m_value = QString::fromLatin1(s, p - s);
1305         }
1306
1307         bool reference = false;
1308         if (*p == '@') {
1309             // skip reference marker
1310             p++;
1311             reference = true;
1312         }
1313         const char* start = p;
1314         if (*p == '-')
1315             p++;
1316
1317         // some values consist of more than one token
1318         bool checkMultiPart = false;
1319
1320         if (p[0] == '0' && p[1] == 'x') {
1321             // parse hex number
1322             p += 2;
1323             while (isxdigit(*p))
1324                 p++;
1325
1326             /*
1327              * Assume this is a pointer, but only if it's not a reference, since
1328              * references can't be expanded.
1329              */
1330             if (!reference) {
1331                 variable->m_varKind = VarTree::VKpointer;
1332             } else {
1333                 /*
1334                  * References are followed by a colon, in which case we'll
1335                  * find the value following the reference address.
1336                  */
1337                 if (*p == ':') {
1338                     p++;
1339                 } else {
1340                     // Paranoia. (Can this happen, i.e. reference not followed by ':'?)
1341                     reference = false;
1342                 }
1343             }
1344             checkMultiPart = true;
1345         } else if (isdigit(*p)) {
1346             // parse decimal number, possibly a float
1347             while (isdigit(*p))
1348                 p++;
1349             if (*p == '.') {            /* TODO: obey i18n? */
1350                 // In long arrays an integer may be followed by '...'.
1351                 // We test for this situation and don't gobble the '...'.
1352                 if (p[1] != '.' || p[0] != '.') {
1353                     // fractional part
1354                     p++;
1355                     while (isdigit(*p))
1356                         p++;
1357                 }
1358             }
1359             if (*p == 'e' || *p == 'E') {
1360                 p++;
1361                 // exponent
1362                 if (*p == '-' || *p == '+')
1363                     p++;
1364                 while (isdigit(*p))
1365                     p++;
1366             }
1367
1368             // for char variables there is the char, eg. 10 '\n'
1369             checkMultiPart = true;
1370         } else if (*p == '<') {
1371             // e.g. <optimized out>
1372             skipNestedAngles(p);
1373         } else if (*p == '"' || *p == '\'') {
1374             // character may have multipart: '\000' <repeats 11 times>
1375             checkMultiPart = *p == '\'';
1376             // found a string
1377             skipString(p);
1378         } else if (*p == 'L' && (p[1] == '"' || p[1] == '\'')) {
1379             // ditto for wchar_t strings
1380             checkMultiPart = p[1] == '\'';
1381             skipString(p);
1382         } else if (*p == '&') {
1383             // function pointer
1384             p++;
1385             skipName(p);
1386             while (isspace(*p)) {
1387                 p++;
1388             }
1389             if (*p == '(') {
1390                 skipNested(p, '(', ')');
1391             }
1392         } else if (strncmp(p, "Variable \"", 10) == 0) {
1393             // Variable "x" is not available.
1394             p += 10;            // skip to "
1395             skipName(p);
1396             if (strncmp(p, "\" is not available.", 19) == 0) {
1397                 p += 19;
1398             }
1399         } else if (strncmp(p, "The value of variable '", 23) == 0) {
1400             p += 23;
1401             skipName(p);
1402             const char* e = strchr(p, '.');
1403             if (e == 0) {
1404                 p += strlen(p);
1405             } else {
1406                 p = e+1;
1407             }
1408         } else {
1409         moreEnum:
1410             // must be an enumeration value
1411             skipName(p);
1412             // nan (floating point Not a Number) is followed by a number in ()
1413             // enum values can look like A::(anonymous namespace)::blue
1414             if (*p == '(') {
1415                 bool isAnonNS = strncmp(p+1, "anonymous namespace)", 20) == 0;
1416                 skipNested(p, '(', ')');
1417                 if (isAnonNS)
1418                     goto moreEnum;
1419             }
1420         }
1421         variable->m_value += QString::fromLatin1(start, p - start);
1422
1423         // remove line breaks from the value; this is ok since
1424         // string values never contain a literal line break
1425         variable->m_value.replace('\n', ' ');
1426
1427         while (checkMultiPart) {
1428             // white space
1429             while (isspace(*p))
1430                 p++;
1431             // may be followed by a string or <...>
1432             // if this was a pointer with a string,
1433             // reset that pointer flag since we have now a value
1434             start = p;
1435             checkMultiPart = false;
1436
1437             if (*p == '"' || *p == '\'') {
1438                 skipString(p);
1439                 variable->m_varKind = VarTree::VKsimple;
1440             } else if (*p == 'L' && (p[1] == '"' || p[1] == '\'')) {
1441                 skipString(p);  // wchar_t string
1442                 variable->m_varKind = VarTree::VKsimple;
1443             } else if (*p == '<') {
1444                 // if this value is part of an array, it might be followed
1445                 // by <repeats 15 times>, which we don't skip here
1446                 if (strncmp(p, "<repeats ", 9) != 0) {
1447                     skipNestedAngles(p);
1448                     checkMultiPart = true;
1449                 }
1450             }
1451             if (p != start) {
1452                 // there is always a blank before the string,
1453                 // which we will include in the final string value
1454                 variable->m_value += QString::fromLatin1(start-1, (p - start)+1);
1455             }
1456         }
1457
1458         if (variable->m_value.length() == 0) {
1459             TRACE("parse error: no value for " + variable->m_name);
1460             return false;
1461         }
1462
1463         // final white space
1464         while (isspace(*p))
1465             p++;
1466         s = p;
1467
1468         /*
1469          * If this was a reference, the value follows. It might even be a
1470          * composite variable!
1471          */
1472         if (reference) {
1473             goto repeat;
1474         }
1475     }
1476
1477     return true;
1478 }
1479
1480 static bool parseNested(const char*& s, ExprValue* variable)
1481 {
1482     // could be a structure or an array
1483     while (isspace(*s))
1484         s++;
1485
1486     const char* p = s;
1487     bool isStruct = false;
1488     /*
1489      * If there is a name followed by an = or an < -- which starts a type
1490      * name -- or "static", it is a structure
1491      */
1492     if (*p == '<' || *p == '}') {
1493         isStruct = true;
1494     } else if (strncmp(p, "static ", 7) == 0) {
1495         isStruct = true;
1496     } else if (isalpha(*p) || *p == '_' || *p == '$') {
1497         // look ahead for a comma after the name
1498         skipName(p);
1499         while (isspace(*p))
1500             p++;
1501         if (*p == '=') {
1502             isStruct = true;
1503         }
1504         p = s;                          /* rescan the name */
1505     }
1506     if (isStruct) {
1507         if (!parseVarSeq(p, variable)) {
1508             return false;
1509         }
1510         variable->m_varKind = VarTree::VKstruct;
1511     } else {
1512         if (!parseValueSeq(p, variable)) {
1513             return false;
1514         }
1515         variable->m_varKind = VarTree::VKarray;
1516     }
1517     s = p;
1518     return true;
1519 }
1520
1521 static bool parseVarSeq(const char*& s, ExprValue* variable)
1522 {
1523     // parse a comma-separated sequence of variables
1524     ExprValue* var = variable;          /* var != 0 to indicate success if empty seq */
1525     for (;;) {
1526         if (*s == '}')
1527             break;
1528         if (strncmp(s, "<No data fields>}", 17) == 0)
1529         {
1530             // no member variables, so break out immediately
1531             s += 16;                    /* go to the closing brace */
1532             break;
1533         }
1534         var = parseVar(s);
1535         if (var == 0)
1536             break;                      /* syntax error */
1537         variable->appendChild(var);
1538         if (*s != ',')
1539             break;
1540         // skip the comma and whitespace
1541         s++;
1542         while (isspace(*s))
1543             s++;
1544     }
1545     return var != 0;
1546 }
1547
1548 static bool parseValueSeq(const char*& s, ExprValue* variable)
1549 {
1550     // parse a comma-separated sequence of variables
1551     int index = 0;
1552     bool good;
1553     for (;;) {
1554         QString name;
1555         name.sprintf("[%d]", index);
1556         ExprValue* var = new ExprValue(name, VarTree::NKplain);
1557         good = parseValue(s, var);
1558         if (!good) {
1559             delete var;
1560             return false;
1561         }
1562         // a value may be followed by "<repeats 45 times>"
1563         if (strncmp(s, "<repeats ", 9) == 0) {
1564             s += 9;
1565             char* end;
1566             int l = strtol(s, &end, 10);
1567             if (end == s || strncmp(end, " times>", 7) != 0) {
1568                 // should not happen
1569                 delete var;
1570                 return false;
1571             }
1572             TRACE(QString().sprintf("found <repeats %d times> in array", l));
1573             // replace name and advance index
1574             name.sprintf("[%d .. %d]", index, index+l-1);
1575             var->m_name = name;
1576             index += l;
1577             // skip " times>" and space
1578             s = end+7;
1579             // possible final space
1580             while (isspace(*s))
1581                 s++;
1582         } else {
1583             index++;
1584         }
1585         variable->appendChild(var);
1586         // long arrays may be terminated by '...'
1587         if (strncmp(s, "...", 3) == 0) {
1588             s += 3;
1589             ExprValue* var = new ExprValue("...", VarTree::NKplain);
1590             var->m_value = i18n("<additional entries of the array suppressed>");
1591             variable->appendChild(var);
1592             break;
1593         }
1594         if (*s != ',') {
1595             break;
1596         }
1597         // skip the comma and whitespace
1598         s++;
1599         while (isspace(*s))
1600             s++;
1601         // sometimes there is a closing brace after a comma
1602 //      if (*s == '}')
1603 //          break;
1604     }
1605     return true;
1606 }
1607
1608 /**
1609  * Parses a stack frame.
1610  */
1611 static void parseFrameInfo(const char*& s, QString& func,
1612                            QString& file, int& lineNo, DbgAddr& address)
1613 {
1614     const char* p = s;
1615
1616     // next may be a hexadecimal address
1617     if (*p == '0') {
1618         const char* start = p;
1619         p++;
1620         if (*p == 'x')
1621             p++;
1622         while (isxdigit(*p))
1623             p++;
1624         address = QString::fromLatin1(start, p-start);
1625         if (strncmp(p, " in ", 4) == 0)
1626             p += 4;
1627     } else {
1628         address = DbgAddr();
1629     }
1630     const char* start = p;
1631     // check for special signal handler frame
1632     if (strncmp(p, "<signal handler called>", 23) == 0) {
1633         func = QString::fromLatin1(start, 23);
1634         file = QString();
1635         lineNo = -1;
1636         s = p+23;
1637         if (*s == '\n')
1638             s++;
1639         return;
1640     }
1641
1642     /*
1643      * Skip the function name. It is terminated by a left parenthesis
1644      * which does not delimit "(anonymous namespace)" and which is
1645      * outside the angle brackets <> of template parameter lists
1646      * and is preceded by a space.
1647      */
1648     while (*p != '\0')
1649     {
1650         if (*p == '<') {
1651             // check for operator<< and operator<
1652             if (p-start >= 8 && strncmp(p-8, "operator", 8) == 0)
1653             {
1654                 p++;
1655                 if (*p == '<')
1656                     p++;
1657             }
1658             else
1659             {
1660                 // skip template parameter list
1661                 skipNestedAngles(p);
1662             }
1663         } else if (*p == '(') {
1664             // this skips "(anonymous namespace)" as well as the formal
1665             // parameter list of the containing function if this is a member
1666             // of a nested class
1667             skipNestedWithString(p, '(', ')');
1668         } else if (*p == ' ') {
1669             ++p;
1670             if (*p == '(')
1671                 break; // parameter list found
1672         } else {
1673             p++;
1674         }
1675     }
1676
1677     if (*p == '\0') {
1678         func = start;
1679         file = QString();
1680         lineNo = -1;
1681         s = p;
1682         return;
1683     }
1684     /*
1685      * Skip parameters. But notice that for complicated conversion
1686      * functions (eg. "operator int(**)()()", ie. convert to pointer to
1687      * pointer to function) as well as operator()(...) we have to skip
1688      * additional pairs of parentheses. Furthermore, recent gdbs write the
1689      * demangled name followed by the arguments in a pair of parentheses,
1690      * where the demangled name can end in "const".
1691      */
1692     do {
1693         skipNestedWithString(p, '(', ')');
1694         while (isspace(*p))
1695             p++;
1696         // skip "const"
1697         if (strncmp(p, "const", 5) == 0) {
1698             p += 5;
1699             while (isspace(*p))
1700                 p++;
1701         }
1702     } while (*p == '(');
1703
1704     // check for file position
1705     if (strncmp(p, "at ", 3) == 0) {
1706         p += 3;
1707         const char* fileStart = p;
1708         // go for the end of the line
1709         while (*p != '\0' && *p != '\n')
1710             p++;
1711         // search back for colon
1712         const char* colon = p;
1713         do {
1714             --colon;
1715         } while (*colon != ':');
1716         file = QString::fromLatin1(fileStart, colon-fileStart);
1717         lineNo = atoi(colon+1)-1;
1718         // skip new-line
1719         if (*p != '\0')
1720             p++;
1721     } else {
1722         // check for "from shared lib"
1723         if (strncmp(p, "from ", 5) == 0) {
1724             p += 5;
1725             // go for the end of the line
1726             while (*p != '\0' && *p != '\n')
1727                 p++;
1728             // skip new-line
1729             if (*p != '\0')
1730                 p++;
1731         }
1732         file = "";
1733         lineNo = -1;
1734     }
1735     // construct the function name (including file info)
1736     if (*p == '\0') {
1737         func = start;
1738     } else {
1739         func = QString::fromLatin1(start, p-start-1);   /* don't include \n */
1740     }
1741     s = p;
1742
1743     /*
1744      * Replace \n (and whitespace around it) in func by a blank. We cannot
1745      * use QString::simplified() for this because this would also
1746      * simplify space that belongs to a string arguments that gdb sometimes
1747      * prints in the argument lists of the function.
1748      */
1749     ASSERT(!isspace(func[0].toLatin1()));       // there must be non-white before first \n
1750     int nl = 0;
1751     while ((nl = func.indexOf('\n', nl)) >= 0) {
1752         // search back to the beginning of the whitespace
1753         int startWhite = nl;
1754         do {
1755             --startWhite;
1756         } while (isspace(func[startWhite].toLatin1()));
1757         startWhite++;
1758         // search forward to the end of the whitespace
1759         do {
1760             nl++;
1761         } while (isspace(func[nl].toLatin1()));
1762         // replace
1763         func.replace(startWhite, nl-startWhite, " ");
1764         /* continue searching for more \n's at this place: */
1765         nl = startWhite+1;
1766     }
1767 }
1768
1769
1770 /**
1771  * Parses a stack frame including its frame number
1772  */
1773 static bool parseFrame(const char*& s, int& frameNo, QString& func,
1774                        QString& file, int& lineNo, DbgAddr& address)
1775 {
1776     // Example:
1777     //  #1  0x8048881 in Dl::Dl (this=0xbffff418, r=3214) at testfile.cpp:72
1778     //  Breakpoint 3, Cl::f(int) const (this=0xbffff3c0, x=17) at testfile.cpp:155
1779
1780     // must start with a hash mark followed by number
1781     // or with "Breakpoint " followed by number and comma
1782     if (s[0] == '#') {
1783         if (!isdigit(s[1]))
1784             return false;
1785         s++;                            /* skip the hash mark */
1786     } else if (strncmp(s, "Breakpoint ", 11) == 0) {
1787         if (!isdigit(s[11]))
1788             return false;
1789         s += 11;                        /* skip "Breakpoint" */
1790     } else
1791         return false;
1792
1793     // frame number
1794     frameNo = atoi(s);
1795     while (isdigit(*s))
1796         s++;
1797     // space and comma
1798     while (isspace(*s) || *s == ',')
1799         s++;
1800     parseFrameInfo(s, func, file, lineNo, address);
1801     return true;
1802 }
1803
1804 void GdbDriver::parseBackTrace(const char* output, std::list<StackFrame>& stack)
1805 {
1806     QString func, file;
1807     int lineNo, frameNo;
1808     DbgAddr address;
1809
1810     while (::parseFrame(output, frameNo, func, file, lineNo, address)) {
1811         stack.push_back(StackFrame());
1812         StackFrame* frm = &stack.back();
1813         frm->frameNo = frameNo;
1814         frm->fileName = file;
1815         frm->lineNo = lineNo;
1816         frm->address = address;
1817         frm->var = new ExprValue(func, VarTree::NKplain);
1818     }
1819 }
1820
1821 bool GdbDriver::parseFrameChange(const char* output, int& frameNo,
1822                                  QString& file, int& lineNo, DbgAddr& address)
1823 {
1824     QString func;
1825     return ::parseFrame(output, frameNo, func, file, lineNo, address);
1826 }
1827
1828
1829 bool GdbDriver::parseBreakList(const char* output, std::list<Breakpoint>& brks)
1830 {
1831     // skip first line, which is the headline
1832     const char* p = strchr(output, '\n');
1833     if (p == 0)
1834         return false;
1835     p++;
1836     if (*p == '\0')
1837         return false;
1838
1839     // split up a line
1840     const char* end;
1841     char* dummy;
1842     while (*p != '\0') {
1843         Breakpoint bp;
1844         // get Num
1845         bp.id = strtol(p, &dummy, 10);  /* don't care about overflows */
1846         p = dummy;
1847         // check for continued <MULTIPLE> breakpoint
1848         if (*p == '.' && isdigit(p[1]))
1849         {
1850             // continuation: skip type and disposition
1851         }
1852         else
1853         {
1854             // get Type
1855             while (isspace(*p))
1856                 p++;
1857             if (strncmp(p, "breakpoint", 10) == 0) {
1858                 p += 10;
1859             } else if (strncmp(p, "hw watchpoint", 13) == 0) {
1860                 bp.type = Breakpoint::watchpoint;
1861                 p += 13;
1862             } else if (strncmp(p, "watchpoint", 10) == 0) {
1863                 bp.type = Breakpoint::watchpoint;
1864                 p += 10;
1865             }
1866             while (isspace(*p))
1867                 p++;
1868             if (*p == '\0')
1869                 break;
1870             // get Disp
1871             bp.temporary = *p++ == 'd';
1872         }
1873         while (*p != '\0' && !isspace(*p))      /* "keep" or "del" */
1874             p++;
1875         while (isspace(*p))
1876             p++;
1877         if (*p == '\0')
1878             break;
1879         // get Enb
1880         bp.enabled = *p++ == 'y';
1881         while (*p != '\0' && !isspace(*p))      /* "y" or "n" */
1882             p++;
1883         while (isspace(*p))
1884             p++;
1885         if (*p == '\0')
1886             break;
1887         // the address, if present
1888         if (bp.type == Breakpoint::breakpoint &&
1889             strncmp(p, "0x", 2) == 0)
1890         {
1891             const char* start = p;
1892             while (*p != '\0' && !isspace(*p))
1893                 p++;
1894             bp.address = QString::fromLatin1(start, p-start);
1895             while (isspace(*p) && *p != '\n')
1896                 p++;
1897             if (*p == '\0')
1898                 break;
1899         }
1900         // remainder is location, hit and ignore count, condition
1901         end = strchr(p, '\n');
1902         if (end == 0) {
1903             bp.location = p;
1904             p += bp.location.length();
1905         } else {
1906             // location of a <MULTIPLE> filled in from subsequent breakpoints
1907             if (strncmp(p, "<MULTIPLE>", 10) != 0)
1908                 bp.location = QString::fromLatin1(p, end-p).trimmed();
1909             p = end+1;                  /* skip over \n */
1910         }
1911
1912         // may be continued in next line
1913         while (isspace(*p)) {   /* p points to beginning of line */
1914             // skip white space at beginning of line
1915             while (isspace(*p))
1916                 p++;
1917
1918             // seek end of line
1919             end = strchr(p, '\n');
1920             if (end == 0)
1921                 end = p+strlen(p);
1922
1923             if (strncmp(p, "breakpoint already hit", 22) == 0) {
1924                 // extract the hit count
1925                 p += 22;
1926                 bp.hitCount = strtol(p, &dummy, 10);
1927                 TRACE(QString("hit count %1").arg(bp.hitCount));
1928             } else if (strncmp(p, "stop only if ", 13) == 0) {
1929                 // extract condition
1930                 p += 13;
1931                 bp.condition = QString::fromLatin1(p, end-p).trimmed();
1932                 TRACE("condition: "+bp.condition);
1933             } else if (strncmp(p, "ignore next ", 12) == 0) {
1934                 // extract ignore count
1935                 p += 12;
1936                 bp.ignoreCount = strtol(p, &dummy, 10);
1937                 TRACE(QString("ignore count %1").arg(bp.ignoreCount));
1938             } else {
1939                 // indeed a continuation
1940                 bp.location += " " + QString::fromLatin1(p, end-p).trimmed();
1941             }
1942             p = end;
1943             if (*p != '\0')
1944                 p++;                    /* skip '\n' */
1945         }
1946
1947         if (brks.empty() || brks.back().id != bp.id) {
1948             brks.push_back(bp);
1949         } else {
1950             // this is a continuation; fill in location if not yet set
1951             // otherwise, drop this breakpoint
1952             Breakpoint& mbp = brks.back();
1953             if (mbp.location.isEmpty() && !bp.location.isEmpty()) {
1954                 mbp.location = bp.location;
1955                 mbp.address = bp.address;
1956             } else if (mbp.address.isEmpty() && !bp.address.isEmpty()) {
1957                 mbp.address = bp.address;
1958             }
1959         }
1960     }
1961     return true;
1962 }
1963
1964 std::list<ThreadInfo> GdbDriver::parseThreadList(const char* output)
1965 {
1966     std::list<ThreadInfo> threads;
1967     if (strcmp(output, "\n") == 0 ||
1968         strncmp(output, "No stack.", 9) == 0 ||
1969         strncmp(output, "No threads.", 11) == 0) {
1970         // no threads
1971         return threads;
1972     }
1973
1974     bool newFormat = false;
1975     const char* p = output;
1976     while (*p != '\0') {
1977         ThreadInfo thr;
1978         // seach look for thread id, watching out for  the focus indicator
1979         thr.hasFocus = false;
1980         while (isspace(*p))             /* may be \n from prev line: see "No stack" below */
1981             p++;
1982
1983         // recent GDBs write a header line; skip it
1984         if (threads.empty() && strncmp(p, "Id   Target", 11) == 0) {
1985             p = strchr(p, '\n');
1986             if (p == NULL)
1987                 break;
1988             newFormat = true;
1989             continue;   // next line please, '\n' is skipped above
1990         }
1991
1992         if (*p == '*') {
1993             thr.hasFocus = true;
1994             p++;
1995             // there follows only whitespace
1996         }
1997         const char* end;
1998         char *temp_end = NULL; /* we need a non-const 'end' for strtol to use...*/
1999         thr.id = strtol(p, &temp_end, 10);
2000         end = temp_end;
2001         if (p == end) {
2002             // syntax error: no number found; bail out
2003             return threads;
2004         }
2005         p = end;
2006
2007         // skip space
2008         while (isspace(*p))
2009             p++;
2010
2011         /*
2012          * Now follows the thread's SYSTAG.
2013          */
2014         if (!newFormat) {
2015             // In the old format, it is terminated by two blanks.
2016             end = strstr(p, "  ");
2017             if (end == 0) {
2018                 // syntax error; bail out
2019                 return threads;
2020             }
2021             end += 2;
2022         } else {
2023             // In the new format lies crazyness: there is no definitive
2024             // end marker. At best we can guess when the SYSTAG ends.
2025             // A typical thread list on Linux looks like this:
2026             //
2027             //   Id   Target Id         Frame
2028             //   2    Thread 0x7ffff7854700 (LWP 10827) "thrserver" 0x00007ffff7928631 in clone () from /lib64/libc.so.6
2029             // * 1    Thread 0x7ffff7fcc700 (LWP 10808) "thrserver" main () at thrserver.c:84
2030             //
2031             // Looking at GDB's code, the Target Id ends in tokens that
2032             // are bracketed by parentheses or quotes. Therefore,
2033             // we skip (at most) two tokens ('Thread' and the address),
2034             // and then all parts that are in parentheses or quotes.
2035             int n = 0;
2036             end = p;
2037             while (*end) {
2038                 if (*end == '"') {
2039                     skipString(end);
2040                     n = 2;
2041                 } else if (*end == '(') {
2042                     skipNested(end, '(', ')');
2043                     n = 2;
2044                 } else if (n < 2) {
2045                     while (*end && !isspace(*end))
2046                         ++end;
2047                     ++n;
2048                 } else {
2049                     break;
2050                 }
2051                 while (isspace(*end))
2052                     ++end;
2053             }
2054         }
2055         thr.threadName = QString::fromLatin1(p, end-p).trimmed();
2056         p = end;
2057
2058         /*
2059          * Now follows a standard stack frame. Sometimes, however, gdb
2060          * catches a thread at an instant where it doesn't have a stack.
2061          */
2062         if (strncmp(p, "[No stack.]", 11) != 0) {
2063             ::parseFrameInfo(p, thr.function, thr.fileName, thr.lineNo, thr.address);
2064         } else {
2065             thr.function = "[No stack]";
2066             thr.lineNo = -1;
2067             p += 11;                    /* \n is skipped above */
2068         }
2069
2070         threads.push_back(thr);
2071     }
2072     return threads;
2073 }
2074
2075 static bool parseNewBreakpoint(const char* o, int& id,
2076                                QString& file, int& lineNo, QString& address);
2077 static bool parseNewWatchpoint(const char* o, int& id,
2078                                QString& expr);
2079
2080 bool GdbDriver::parseBreakpoint(const char* output, int& id,
2081                                 QString& file, int& lineNo, QString& address)
2082 {
2083     // skip lines of that begin with "(Cannot find"
2084     while (strncmp(output, "(Cannot find", 12) == 0 ||
2085            strncmp(output, "Note: breakpoint", 16) == 0)
2086     {
2087         output = strchr(output, '\n');
2088         if (output == 0)
2089             return false;
2090         output++;                       /* skip newline */
2091     }
2092
2093     if (strncmp(output, "Breakpoint ", 11) == 0) {
2094         output += 11;                   /* skip "Breakpoint " */
2095         return ::parseNewBreakpoint(output, id, file, lineNo, address);
2096     } else if (strncmp(output, "Temporary breakpoint ", 21) == 0) {
2097         output += 21;
2098         return ::parseNewBreakpoint(output, id, file, lineNo, address);
2099     } else if (strncmp(output, "Hardware watchpoint ", 20) == 0) {
2100         output += 20;
2101         return ::parseNewWatchpoint(output, id, address);
2102     } else if (strncmp(output, "Watchpoint ", 11) == 0) {
2103         output += 11;
2104         return ::parseNewWatchpoint(output, id, address);
2105     }
2106     return false;
2107 }
2108
2109 static bool parseNewBreakpoint(const char* o, int& id,
2110                                QString& file, int& lineNo, QString& address)
2111 {
2112     // breakpoint id
2113     char* p;
2114     id = strtoul(o, &p, 10);
2115     if (p == o)
2116         return false;
2117
2118     // check for the address
2119     if (strncmp(p, " at 0x", 6) == 0) {
2120         char* start = p+4;             /* skip " at ", but not 0x */
2121         p += 6;
2122         while (isxdigit(*p))
2123             ++p;
2124         address = QString::fromLatin1(start, p-start);
2125     }
2126
2127     /*
2128      * Mostly, GDB responds with this syntax:
2129      *
2130      * Breakpoint 1 at 0x400b94: file multibrkpt.cpp, line 9. (2 locations)
2131      *
2132      * but sometimes it uses this syntax:
2133      *
2134      * Breakpoint 4 at 0x804f158: lotto739.cpp:95. (3 locations)
2135      */
2136     char* fileEnd, *numStart = 0;
2137     char* fileStart = strstr(p, "file ");
2138     if (fileStart != 0)
2139     {
2140         fileStart += 5;
2141         fileEnd = strstr(fileStart, ", line ");
2142         if (fileEnd != 0)
2143             numStart = fileEnd + 7;
2144     }
2145     if (numStart == 0 && p[0] == ':' && p[1] == ' ')
2146     {
2147         fileStart = p+2;
2148         while (isspace(*fileStart))
2149             ++fileStart;
2150         fileEnd = strchr(fileStart, ':');
2151         if (fileEnd != 0)
2152             numStart = fileEnd + 1;
2153     }
2154     if (numStart == 0)
2155         return !address.isEmpty();      /* parse error only if there's no address */
2156
2157     QString fileName = QString::fromLatin1(fileStart, fileEnd-fileStart);
2158     int line = strtoul(numStart, &p, 10);
2159     if (numStart == p)
2160         return false;
2161
2162     file = fileName;
2163     lineNo = line-1;                    /* zero-based! */
2164     return true;
2165 }
2166
2167 static bool parseNewWatchpoint(const char* o, int& id,
2168                                QString& expr)
2169 {
2170     // watchpoint id
2171     char* p;
2172     id = strtoul(o, &p, 10);
2173     if (p == o)
2174         return false;
2175
2176     if (strncmp(p, ": ", 2) != 0)
2177         return false;
2178     p += 2;
2179
2180     // all the rest on the line is the expression
2181     expr = QString::fromLatin1(p, strlen(p)).trimmed();
2182     return true;
2183 }
2184
2185 void GdbDriver::parseLocals(const char* output, std::list<ExprValue*>& newVars)
2186 {
2187     // check for possible error conditions
2188     if (strncmp(output, "No symbol table", 15) == 0)
2189     {
2190         return;
2191     }
2192
2193     while (*output != '\0') {
2194         while (isspace(*output))
2195             output++;
2196         if (*output == '\0')
2197             break;
2198         // skip occurrences of "No locals" and "No args"
2199         if (strncmp(output, "No locals", 9) == 0 ||
2200             strncmp(output, "No arguments", 12) == 0)
2201         {
2202             output = strchr(output, '\n');
2203             if (output == 0) {
2204                 break;
2205             }
2206             continue;
2207         }
2208
2209         ExprValue* variable = parseVar(output);
2210         if (variable == 0) {
2211             break;
2212         }
2213         // do not add duplicates
2214         for (std::list<ExprValue*>::iterator o = newVars.begin(); o != newVars.end(); ++o) {
2215             if ((*o)->m_name == variable->m_name) {
2216                 delete variable;
2217                 goto skipDuplicate;
2218             }
2219         }
2220         newVars.push_back(variable);
2221     skipDuplicate:;
2222     }
2223 }
2224
2225 ExprValue* GdbDriver::parsePrintExpr(const char* output, bool wantErrorValue)
2226 {
2227     ExprValue* var = 0;
2228     // check for error conditions
2229     if (!parseErrorMessage(output, var, wantErrorValue))
2230     {
2231         // parse the variable
2232         var = parseVar(output);
2233     }
2234     return var;
2235 }
2236
2237 bool GdbDriver::parseChangeWD(const char* output, QString& message)
2238 {
2239     bool isGood = false;
2240     message = QString(output).simplified();
2241     if (message.isEmpty()) {
2242         message = i18n("New working directory: ") + m_programWD;
2243         isGood = true;
2244     }
2245     return isGood;
2246 }
2247
2248 bool GdbDriver::parseChangeExecutable(const char* output, QString& message)
2249 {
2250     message = output;
2251
2252     m_haveCoreFile = false;
2253
2254     /*
2255      * Lines starting with the following do not indicate errors:
2256      *     Using host libthread_db
2257      *     (no debugging symbols found)
2258      *     Reading symbols from
2259      */
2260     while (strncmp(output, "Reading symbols from", 20) == 0 ||
2261            strncmp(output, "done.", 5) == 0 ||
2262            strncmp(output, "Missing separate debuginfo", 26) == 0 ||
2263            strncmp(output, "Try: ", 5) == 0 ||
2264            strncmp(output, "Using host libthread_db", 23) == 0 ||
2265            strncmp(output, "(no debugging symbols found)", 28) == 0)
2266     {
2267         // this line is good, go to the next one
2268         const char* end = strchr(output, '\n');
2269         if (end == 0)
2270             output += strlen(output);
2271         else
2272             output = end+1;
2273     }
2274
2275     /*
2276      * If we've parsed all lines, there was no error.
2277      */
2278     return output[0] == '\0';
2279 }
2280
2281 bool GdbDriver::parseCoreFile(const char* output)
2282 {
2283     // if command succeeded, gdb emits a line starting with "#0 "
2284     m_haveCoreFile = strstr(output, "\n#0 ") != 0;
2285     return m_haveCoreFile;
2286 }
2287
2288 uint GdbDriver::parseProgramStopped(const char* output, QString& message)
2289 {
2290     // optionally: "program changed, rereading symbols",
2291     // followed by:
2292     // "Program exited normally"
2293     // "Program terminated with wignal SIGSEGV"
2294     // "Program received signal SIGINT" or other signal
2295     // "Breakpoint..."
2296     // GDB since 7.3 prints
2297     // "[Inferior 1 (process 13400) exited normally]"
2298     // "[Inferior 1 (process 14698) exited with code 01]"
2299
2300     // go through the output, line by line, checking what we have
2301     const char* start = output - 1;
2302     uint flags = SFprogramActive;
2303     message = QString();
2304     do {
2305         start++;                        /* skip '\n' */
2306
2307         if (strncmp(start, "Program ", 8) == 0 ||
2308             strncmp(start, "ptrace: ", 8) == 0) {
2309             /*
2310              * When we receive a signal, the program remains active.
2311              *
2312              * Special: If we "stopped" in a corefile, the string "Program
2313              * terminated with signal"... is displayed. (Normally, we see
2314              * "Program received signal"... when a signal happens.)
2315              */
2316             if (strncmp(start, "Program exited", 14) == 0 ||
2317                 (strncmp(start, "Program terminated", 18) == 0 && !m_haveCoreFile) ||
2318                 strncmp(start, "ptrace: ", 8) == 0)
2319             {
2320                 flags &= ~SFprogramActive;
2321             }
2322
2323             // set message
2324             const char* endOfMessage = strchr(start, '\n');
2325             if (endOfMessage == 0)
2326                 endOfMessage = start + strlen(start);
2327             message = QString::fromLatin1(start, endOfMessage-start);
2328         } else if (strncmp(start, "[Inferior ", 10) == 0) {
2329             const char* p = start + 10;
2330             // skip number and space
2331             while (*p && !isspace(*p))
2332                 ++p;
2333             while (isspace(*p))
2334                 ++p;
2335             if (*p == '(') {
2336                 skipNested(p, '(', ')');
2337                 if (strncmp(p, " exited ", 8) == 0) {
2338                     flags &= ~SFprogramActive;
2339
2340                     // set message
2341                     const char* end = strchr(p, '\n');
2342                     if (end == 0)
2343                         end = p + strlen(p);
2344                     // strip [] from the message
2345                     message = QString::fromLatin1(start+1, end-start-2);
2346                 }
2347             }
2348         } else if (strncmp(start, "Breakpoint ", 11) == 0) {
2349             /*
2350              * We stopped at a (permanent) breakpoint (gdb doesn't tell us
2351              * that it stopped at a temporary breakpoint).
2352              */
2353             flags |= SFrefreshBreak;
2354         } else if (strstr(start, "re-reading symbols.") != 0) {
2355             flags |= SFrefreshSource;
2356         }
2357
2358         // next line, please
2359         start = strchr(start, '\n');
2360     } while (start != 0);
2361
2362     /*
2363      * Gdb only notices when new threads have appeared, but not when a
2364      * thread finishes. So we always have to assume that the list of
2365      * threads has changed.
2366      */
2367     flags |= SFrefreshThreads;
2368
2369     return flags;
2370 }
2371
2372 QStringList GdbDriver::parseSharedLibs(const char* output)
2373 {
2374     QStringList shlibs;
2375     if (strncmp(output, "No shared libraries loaded", 26) == 0)
2376         return shlibs;
2377
2378     // parse the table of shared libraries
2379
2380     // strip off head line
2381     output = strchr(output, '\n');
2382     if (output == 0)
2383         return shlibs;
2384     output++;                           /* skip '\n' */
2385     QString shlibName;
2386     while (*output != '\0') {
2387         // format of a line is
2388         // 0x404c5000  0x40580d90  Yes         /lib/libc.so.5
2389         // 3 blocks of non-space followed by space
2390         for (int i = 0; *output != '\0' && i < 3; i++) {
2391             while (*output != '\0' && !isspace(*output)) {      /* non-space */
2392                 output++;
2393             }
2394             while (isspace(*output)) {  /* space */
2395                 output++;
2396             }
2397         }
2398         if (*output == '\0')
2399             return shlibs;
2400         const char* start = output;
2401         output = strchr(output, '\n');
2402         if (output == 0)
2403             output = start + strlen(start);
2404         shlibName = QString::fromLatin1(start, output-start);
2405         if (*output != '\0')
2406             output++;
2407         shlibs.append(shlibName);
2408         TRACE("found shared lib " + shlibName);
2409     }
2410     return shlibs;
2411 }
2412
2413 bool GdbDriver::parseFindType(const char* output, QString& type)
2414 {
2415     if (strncmp(output, "type = ", 7) != 0)
2416         return false;
2417
2418     /*
2419      * Everything else is the type. We strip off any leading "const" and any
2420      * trailing "&" on the grounds that neither affects the decoding of the
2421      * object. We also strip off all white-space from the type.
2422      */
2423     output += 7;
2424     if (strncmp(output, "const ", 6) == 0)
2425         output += 6;
2426     type = output;
2427     type.replace(QRegExp("\\s+"), "");
2428     if (type.endsWith("&"))
2429         type.truncate(type.length() - 1);
2430     return true;
2431 }
2432
2433 std::list<RegisterInfo> GdbDriver::parseRegisters(const char* output)
2434 {
2435     std::list<RegisterInfo> regs;
2436     if (strncmp(output, "The program has no registers now", 32) == 0) {
2437         return regs;
2438     }
2439
2440     // parse register values
2441     while (*output != '\0')
2442     {
2443         RegisterInfo reg;
2444         // skip space at the start of the line
2445         while (isspace(*output))
2446             output++;
2447
2448         // register name
2449         const char* start = output;
2450         while (*output != '\0' && !isspace(*output))
2451             output++;
2452         if (*output == '\0')
2453             break;
2454         reg.regName = QString::fromLatin1(start, output-start);
2455
2456         // skip space
2457         while (isspace(*output))
2458             output++;
2459
2460         QString value;
2461
2462         /*
2463          * If we find a brace now, this is a vector register. We look for
2464          * the closing brace and treat the result as cooked value.
2465          */
2466         if (*output == '{')
2467         {
2468             start = output;
2469             skipNested(output, '{', '}');
2470             value = QString::fromLatin1(start, output-start).simplified();
2471             // skip space, but not the end of line
2472             while (isspace(*output) && *output != '\n')
2473                 output++;
2474             // get rid of the braces at the begining and the end
2475             value.remove(0, 1);
2476             if (value[value.length()-1] == '}') {
2477                 value = value.left(value.length()-1);
2478             }
2479             // gdb 5.3 doesn't print a separate set of raw values
2480             if (*output == '{') {
2481                 // another set of vector follows
2482                 // what we have so far is the raw value
2483                 reg.rawValue = value;
2484
2485                 start = output;
2486                 skipNested(output, '{', '}');
2487                 value = QString::fromLatin1(start, output-start).simplified();
2488             } else {
2489                 // for gdb 5.3
2490                 // find first type that does not have an array, this is the RAW value
2491                 const char* end=start;
2492                 findEnd(end);
2493                 const char* cur=start;
2494                 while (cur<end) {
2495                     while (*cur != '=' && cur<end)
2496                         cur++;
2497                     cur++;
2498                     while (isspace(*cur) && cur<end)
2499                         cur++;
2500                     if (isNumberish(*cur)) {
2501                         end=cur;
2502                         while (*end && (*end!='}') && (*end!=',') && (*end!='\n'))
2503                             end++;
2504                         QString rawValue = QString::fromLatin1(cur, end-cur).simplified();
2505                         reg.rawValue = rawValue;
2506
2507                         if (rawValue.left(2)=="0x") {
2508                             // ok we have a raw value, now get it's type
2509                             end=cur-1;
2510                             while (isspace(*end) || *end=='=') end--;
2511                             end++;
2512                             cur=end-1;
2513                             while (*cur!='{' && *cur!=' ')
2514                                 cur--;
2515                             cur++;
2516                             reg.type = QString::fromLatin1(cur, end-cur);
2517                         }
2518
2519                         // end while loop
2520                         cur=end;
2521                     }
2522                 }
2523                 // skip to the end of line
2524                 while (*output != '\0' && *output != '\n')
2525                     output++;
2526                 // get rid of the braces at the begining and the end
2527                 value.remove(0, 1);
2528                 if (value[value.length()-1] == '}') {
2529                     value.truncate(value.length()-1);
2530                 }
2531             }
2532             reg.cookedValue = value;
2533         }
2534         else
2535         {
2536         continuation:
2537             // the rest of the line is the register value
2538             start = output;
2539             output = strchr(output,'\n');
2540             if (output == 0)
2541                 output = start + strlen(start);
2542             value += QString::fromLatin1(start, output-start).simplified();
2543
2544             /*
2545              * Look ahead: if the subsequent line is indented, it continues
2546              * the current register value.
2547              */
2548             if (output != 0 && isspace(output[1]))
2549             {
2550                 ++output;
2551                 value += ' ';
2552                 goto continuation;
2553             }
2554
2555             /*
2556              * We split the raw from the cooked values.
2557              * Some modern gdbs explicitly say: "0.1234 (raw 0x3e4567...)".
2558              * Here, the cooked value comes first, and the raw value is in
2559              * the second part.
2560              */
2561             int pos = value.indexOf(" (raw ");
2562             if (pos >= 0)
2563             {
2564                 reg.cookedValue = value.left(pos);
2565                 reg.rawValue = value.mid(pos+6);
2566                 if (reg.rawValue.right(1) == ")")       // remove closing bracket
2567                     reg.rawValue.truncate(reg.rawValue.length()-1);
2568             }
2569             else
2570             {
2571                 /*
2572                 * In other cases we split off the first token (separated by
2573                 * whitespace). It is the raw value. The remainder of the line
2574                 * is the cooked value.
2575                 */
2576                 int pos = value.indexOf(' ');
2577                 if (pos < 0) {
2578                     reg.rawValue = value;
2579                     reg.cookedValue = QString();
2580                 } else {
2581                     reg.rawValue = value.left(pos);
2582                     reg.cookedValue = value.mid(pos+1);
2583                 }
2584             }
2585         }
2586         if (*output != '\0')
2587             output++;                   /* skip '\n' */
2588
2589         regs.push_back(reg);
2590     }
2591     return regs;
2592 }
2593
2594 bool GdbDriver::parseInfoLine(const char* output, QString& addrFrom, QString& addrTo)
2595 {
2596     // "is at address" or "starts at address"
2597     const char* start = strstr(output, "s at address ");
2598     if (start == 0)
2599         return false;
2600
2601     start += 13;
2602     const char* p = start;
2603     while (*p != '\0' && !isspace(*p))
2604         p++;
2605     addrFrom = QString::fromLatin1(start, p-start);
2606
2607     start = strstr(p, "and ends at ");
2608     if (start == 0) {
2609         addrTo = addrFrom;
2610         return true;
2611     }
2612
2613     start += 12;
2614     p = start;
2615     while (*p != '\0' && !isspace(*p))
2616         p++;
2617     addrTo = QString::fromLatin1(start, p-start);
2618
2619     return true;
2620 }
2621
2622 std::list<DisassembledCode> GdbDriver::parseDisassemble(const char* output)
2623 {
2624     std::list<DisassembledCode> code;
2625
2626     if (strncmp(output, "Dump of assembler", 17) != 0) {
2627         // error message?
2628         DisassembledCode c;
2629         c.code = output;
2630         code.push_back(c);
2631         return code;
2632     }
2633
2634     // remove first line
2635     const char* p = strchr(output, '\n');
2636     if (p == 0)
2637         return code;                    /* not a regular output */
2638
2639     p++;
2640
2641     // remove last line
2642     const char* end = strstr(output, "End of assembler");
2643     if (end == 0)
2644         end = p + strlen(p);
2645
2646     // remove function offsets from the lines
2647     while (p != end)
2648     {
2649         DisassembledCode c;
2650         // skip initial space or PC pointer ("=>", since gdb 7.1)
2651         while (p != end) {
2652             if (isspace(*p))
2653                 ++p;
2654             else if (p[0] == '=' && p[1] == '>')
2655                 p += 2;
2656             else
2657                 break;
2658         }
2659         const char* start = p;
2660         // address
2661         while (p != end && !isspace(*p))
2662             p++;
2663         c.address = QString::fromLatin1(start, p-start);
2664
2665         // function name (enclosed in '<>', followed by ':')
2666         while (p != end && *p != '<')
2667             p++;
2668         if (*p == '<')
2669             skipNestedAngles(p);
2670         if (*p == ':')
2671             p++;
2672
2673         // space until code
2674         while (p != end && isspace(*p))
2675             p++;
2676
2677         // code until end of line
2678         start = p;
2679         while (p != end && *p != '\n')
2680             p++;
2681         if (p != end)                   /* include '\n' */
2682             p++;
2683
2684         c.code = QString::fromLatin1(start, p-start);
2685         code.push_back(c);
2686     }
2687     return code;
2688 }
2689
2690 QString GdbDriver::parseMemoryDump(const char* output, std::list<MemoryDump>& memdump)
2691 {
2692     if (isErrorExpr(output)) {
2693         // error; strip space
2694         QString msg = output;
2695         return msg.trimmed();
2696     }
2697
2698     const char* p = output;             /* save typing */
2699
2700     // the address
2701     while (*p != 0) {
2702         MemoryDump md;
2703
2704         const char* start = p;
2705         while (*p != '\0' && *p != ':' && !isspace(*p))
2706             p++;
2707         md.address = QString::fromLatin1(start, p-start);
2708         if (*p != ':') {
2709             // parse function offset
2710             while (isspace(*p))
2711                 p++;
2712             start = p;
2713             while (*p != '\0' && !(*p == ':' && isspace(p[1])))
2714                 p++;
2715             md.address.fnoffs = QString::fromLatin1(start, p-start);
2716         }
2717         if (*p == ':')
2718             p++;
2719         // skip space; this may skip a new-line char!
2720         while (isspace(*p))
2721             p++;
2722         // everything to the end of the line is the memory dump
2723         const char* end = strchr(p, '\n');
2724         if (end != 0) {
2725             md.dump = QString::fromLatin1(p, end-p);
2726             p = end+1;
2727         } else {
2728             md.dump = QString::fromLatin1(p, strlen(p));
2729             p += strlen(p);
2730         }
2731         memdump.push_back(md);
2732     }
2733
2734     return QString();
2735 }
2736
2737 QString GdbDriver::editableValue(VarTree* value)
2738 {
2739     QByteArray ba = value->value().toLatin1();
2740     const char* s = ba.constData();
2741
2742     // if the variable is a pointer value that contains a cast,
2743     // remove the cast
2744     if (*s == '(') {
2745         skipNested(s, '(', ')');
2746         // skip space
2747         while (isspace(*s))
2748             ++s;
2749     }
2750
2751 repeat:
2752     const char* start = s;
2753
2754     if (strncmp(s, "0x", 2) == 0)
2755     {
2756         s += 2;
2757         while (isxdigit(*s))
2758             ++s;
2759
2760         /*
2761          * What we saw so far might have been a reference. If so, edit the
2762          * referenced value. Otherwise, edit the pointer.
2763          */
2764         if (*s == ':') {
2765             // a reference
2766             ++s;
2767             goto repeat;
2768         }
2769         // a pointer
2770         // if it's a pointer to a string, remove the string
2771         const char* end = s;
2772         while (isspace(*s))
2773             ++s;
2774         if (*s == '"') {
2775             // a string
2776             return QString::fromLatin1(start, end-start);
2777         } else {
2778             // other pointer
2779             return QString::fromLatin1(start, strlen(start));
2780         }
2781     }
2782
2783     // else leave it unchanged (or stripped of the reference preamble)
2784     return s;
2785 }
2786
2787 QString GdbDriver::parseSetVariable(const char* output)
2788 {
2789     // if there is any output, it is an error message
2790     QString msg = output;
2791     return msg.trimmed();
2792 }
2793
2794
2795 #include "gdbdriver.moc"