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