gdb/objc-lang.c - gdb

Global variables defined

Data types defined

Functions defined

Macros defined

Source code

  1. /* Objective-C language support routines for GDB, the GNU debugger.

  3.    Copyright (C) 2002-2015 Free Software Foundation, Inc.

  5.    Contributed by Apple Computer, Inc.
  6.    Written by Michael Snyder.

  8.    This file is part of GDB.

  10.    This program is free software; you can redistribute it and/or modify
  11.    it under the terms of the GNU General Public License as published by
  12.    the Free Software Foundation; either version 3 of the License, or
  13.    (at your option) any later version.

  15.    This program is distributed in the hope that it will be useful,
  16.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18.    GNU General Public License for more details.

  20.    You should have received a copy of the GNU General Public License
  21.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  23. #include "defs.h"
  24. #include "symtab.h"
  25. #include "gdbtypes.h"
  26. #include "expression.h"
  27. #include "parser-defs.h"
  28. #include "language.h"
  29. #include "varobj.h"
  30. #include "c-lang.h"
  31. #include "objc-lang.h"
  32. #include "complaints.h"
  33. #include "value.h"
  34. #include "symfile.h"
  35. #include "objfiles.h"
  36. #include "target.h"                /* for target_has_execution */
  37. #include "gdbcore.h"
  38. #include "gdbcmd.h"
  39. #include "frame.h"
  40. #include "gdb_regex.h"
  41. #include "regcache.h"
  42. #include "block.h"
  43. #include "infcall.h"
  44. #include "valprint.h"
  45. #include "cli/cli-utils.h"

  47. #include <ctype.h>

  49. ‌struct objc_object {
  50.   CORE_ADDR isa;
  51. };

  53. ‌struct objc_class {
  54.   CORE_ADDR isa;
  55.   CORE_ADDR super_class;
  56.   CORE_ADDR name;
  57.   long version;
  58.   long info;
  59.   long instance_size;
  60.   CORE_ADDR ivars;
  61.   CORE_ADDR methods;
  62.   CORE_ADDR cache;
  63.   CORE_ADDR protocols;
  64. };

  66. ‌struct objc_super {
  67.   CORE_ADDR receiver;
  68.   CORE_ADDR class;
  69. };

  71. ‌struct objc_method {
  72.   CORE_ADDR name;
  73.   CORE_ADDR types;
  74.   CORE_ADDR imp;
  75. };

  77. ‌static const struct objfile_data *objc_objfile_data;

  79. /* Lookup a structure type named "struct NAME", visible in lexical
  80.    block BLOCK.  If NOERR is nonzero, return zero if NAME is not
  81.    suitably defined.  */

  83. struct symbol *
  84. ‌lookup_struct_typedef (char *name, const struct block *block, int noerr)
  85. {
  86.   struct symbol *sym;

  88.   sym = lookup_symbol (name, block, STRUCT_DOMAIN, 0);

  90.   if (sym == NULL)
  91.     {
  92.       if (noerr)
  93.         return 0;
  94.       else
  95.         error (_("No struct type named %s."), name);
  96.     }
  97.   if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_STRUCT)
  98.     {
  99.       if (noerr)
  100.         return 0;
  101.       else
  102.         error (_("This context has class, union or enum %s, not a struct."),
  103.                name);
  104.     }
  105.   return sym;
  106. }

  108. CORE_ADDR
  109. ‌lookup_objc_class (struct gdbarch *gdbarch, char *classname)
  110. {
  111.   struct type *char_type = builtin_type (gdbarch)->builtin_char;
  112.   struct value * function, *classval;

  114.   if (! target_has_execution)
  115.     {
  116.       /* Can't call into inferior to lookup class.  */
  117.       return 0;
  118.     }

  120.   if (lookup_minimal_symbol("objc_lookUpClass", 0, 0).minsym)
  121.     function = find_function_in_inferior("objc_lookUpClass", NULL);
  122.   else if (lookup_minimal_symbol ("objc_lookup_class", 0, 0).minsym)
  123.     function = find_function_in_inferior("objc_lookup_class", NULL);
  124.   else
  125.     {
  126.       complaint (&symfile_complaints,
  127.                  _("no way to lookup Objective-C classes"));
  128.       return 0;
  129.     }

  131.   classval = value_string (classname, strlen (classname) + 1, char_type);
  132.   classval = value_coerce_array (classval);
  133.   return (CORE_ADDR) value_as_long (call_function_by_hand (function,
  134.                                                            1, &classval));
  135. }

  137. CORE_ADDR
  138. ‌lookup_child_selector (struct gdbarch *gdbarch, char *selname)
  139. {
  140.   struct type *char_type = builtin_type (gdbarch)->builtin_char;
  141.   struct value * function, *selstring;

  143.   if (! target_has_execution)
  144.     {
  145.       /* Can't call into inferior to lookup selector.  */
  146.       return 0;
  147.     }

  149.   if (lookup_minimal_symbol("sel_getUid", 0, 0).minsym)
  150.     function = find_function_in_inferior("sel_getUid", NULL);
  151.   else if (lookup_minimal_symbol ("sel_get_any_uid", 0, 0).minsym)
  152.     function = find_function_in_inferior("sel_get_any_uid", NULL);
  153.   else
  154.     {
  155.       complaint (&symfile_complaints,
  156.                  _("no way to lookup Objective-C selectors"));
  157.       return 0;
  158.     }

  160.   selstring = value_coerce_array (value_string (selname,
  161.                                                 strlen (selname) + 1,
  162.                                                 char_type));
  163.   return value_as_long (call_function_by_hand (function, 1, &selstring));
  164. }

  166. struct value *
  167. ‌value_nsstring (struct gdbarch *gdbarch, char *ptr, int len)
  168. {
  169.   struct type *char_type = builtin_type (gdbarch)->builtin_char;
  170.   struct value *stringValue[3];
  171.   struct value *function, *nsstringValue;
  172.   struct symbol *sym;
  173.   struct type *type;

  175.   if (!target_has_execution)
  176.     return 0;                /* Can't call into inferior to create NSString.  */

  178.   stringValue[2] = value_string(ptr, len, char_type);
  179.   stringValue[2] = value_coerce_array(stringValue[2]);
  180.   /* _NSNewStringFromCString replaces "istr" after Lantern2A.  */
  181.   if (lookup_minimal_symbol("_NSNewStringFromCString", 0, 0).minsym)
  182.     {
  183.       function = find_function_in_inferior("_NSNewStringFromCString", NULL);
  184.       nsstringValue = call_function_by_hand(function, 1, &stringValue[2]);
  185.     }
  186.   else if (lookup_minimal_symbol("istr", 0, 0).minsym)
  187.     {
  188.       function = find_function_in_inferior("istr", NULL);
  189.       nsstringValue = call_function_by_hand(function, 1, &stringValue[2]);
  190.     }
  191.   else if (lookup_minimal_symbol("+[NSString stringWithCString:]", 0, 0).minsym)
  192.     {
  193.       function
  194.         = find_function_in_inferior("+[NSString stringWithCString:]", NULL);
  195.       type = builtin_type (gdbarch)->builtin_long;

  197.       stringValue[0] = value_from_longest
  198.         (type, lookup_objc_class (gdbarch, "NSString"));
  199.       stringValue[1] = value_from_longest
  200.         (type, lookup_child_selector (gdbarch, "stringWithCString:"));
  201.       nsstringValue = call_function_by_hand(function, 3, &stringValue[0]);
  202.     }
  203.   else
  204.     error (_("NSString: internal error -- no way to create new NSString"));

  206.   sym = lookup_struct_typedef("NSString", 0, 1);
  207.   if (sym == NULL)
  208.     sym = lookup_struct_typedef("NXString", 0, 1);
  209.   if (sym == NULL)
  210.     type = builtin_type (gdbarch)->builtin_data_ptr;
  211.   else
  212.     type = lookup_pointer_type(SYMBOL_TYPE (sym));

  214.   deprecated_set_value_type (nsstringValue, type);
  215.   return nsstringValue;
  216. }

  218. /* Objective-C name demangling.  */

  220. char *
  221. ‌objc_demangle (const char *mangled, int options)
  222. {
  223.   char *demangled, *cp;

  225.   if (mangled[0] == '_' &&
  226.      (mangled[1] == 'i' || mangled[1] == 'c') &&
  227.       mangled[2] == '_')
  228.     {
  229.       cp = demangled = xmalloc(strlen(mangled) + 2);

  231.       if (mangled[1] == 'i')
  232.         *cp++ = '-';                /* for instance method */
  233.       else
  234.         *cp++ = '+';                /* for class    method */

  236.       *cp++ = '[';                /* opening left brace  */
  237.       strcpy(cp, mangled+3);        /* Tack on the rest of the mangled name.  */

  239.       while (*cp && *cp == '_')
  240.         cp++;                        /* Skip any initial underbars in class
  241.                                    name.  */

  243.       cp = strchr(cp, '_');
  244.       if (!cp)                        /* Find first non-initial underbar.  */
  245.         {
  246.           xfree(demangled);        /* not mangled name */
  247.           return NULL;
  248.         }
  249.       if (cp[1] == '_')                /* Easy case: no category name.    */
  250.         {
  251.           *cp++ = ' ';                /* Replace two '_' with one ' '.   */
  252.           strcpy(cp, mangled + (cp - demangled) + 2);
  253.         }
  254.       else
  255.         {
  256.           *cp++ = '(';                /* Less easy case: category name.  */
  257.           cp = strchr(cp, '_');
  258.           if (!cp)
  259.             {
  260.               xfree(demangled);        /* not mangled name */
  261.               return NULL;
  262.             }
  263.           *cp++ = ')';
  264.           *cp++ = ' ';                /* Overwriting 1st char of method name...  */
  265.           strcpy(cp, mangled + (cp - demangled));        /* Get it back.  */
  266.         }

  268.       while (*cp && *cp == '_')
  269.         cp++;                        /* Skip any initial underbars in
  270.                                    method name.  */

  272.       for (; *cp; cp++)
  273.         if (*cp == '_')
  274.           *cp = ':';                /* Replace remaining '_' with ':'.  */

  276.       *cp++ = ']';                /* closing right brace */
  277.       *cp++ = 0;                /* string terminator */
  278.       return demangled;
  279.     }
  280.   else
  281.     return NULL;        /* Not an objc mangled name.  */
  282. }

  284. /* Determine if we are currently in the Objective-C dispatch function.
  285.    If so, get the address of the method function that the dispatcher
  286.    would call and use that as the function to step into instead.  Also
  287.    skip over the trampoline for the function (if any).  This is better
  288.    for the user since they are only interested in stepping into the
  289.    method function anyway.  */
  290. static CORE_ADDR
  291. ‌objc_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc)
  292. {
  293.   struct gdbarch *gdbarch = get_frame_arch (frame);
  294.   CORE_ADDR real_stop_pc;
  295.   CORE_ADDR method_stop_pc;

  297.   real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);

  299.   if (real_stop_pc != 0)
  300.     find_objc_msgcall (real_stop_pc, &method_stop_pc);
  301.   else
  302.     find_objc_msgcall (stop_pc, &method_stop_pc);

  304.   if (method_stop_pc)
  305.     {
  306.       real_stop_pc = gdbarch_skip_trampoline_code
  307.                        (gdbarch, frame, method_stop_pc);
  308.       if (real_stop_pc == 0)
  309.         real_stop_pc = method_stop_pc;
  310.     }

  312.   return real_stop_pc;
  313. }


  316. /* Table mapping opcodes into strings for printing operators
  317.    and precedences of the operators.  */

  319. ‌static const struct op_print objc_op_print_tab[] =
  320.   {
  321.     {",",  BINOP_COMMA, PREC_COMMA, 0},
  322.     {"=",  BINOP_ASSIGN, PREC_ASSIGN, 1},
  323.     {"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
  324.     {"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
  325.     {"|",  BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
  326.     {"^",  BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
  327.     {"&",  BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
  328.     {"==", BINOP_EQUAL, PREC_EQUAL, 0},
  329.     {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0},
  330.     {"<=", BINOP_LEQ, PREC_ORDER, 0},
  331.     {">=", BINOP_GEQ, PREC_ORDER, 0},
  332.     {">",  BINOP_GTR, PREC_ORDER, 0},
  333.     {"<",  BINOP_LESS, PREC_ORDER, 0},
  334.     {">>", BINOP_RSH, PREC_SHIFT, 0},
  335.     {"<<", BINOP_LSH, PREC_SHIFT, 0},
  336.     {"+",  BINOP_ADD, PREC_ADD, 0},
  337.     {"-",  BINOP_SUB, PREC_ADD, 0},
  338.     {"*",  BINOP_MUL, PREC_MUL, 0},
  339.     {"/",  BINOP_DIV, PREC_MUL, 0},
  340.     {"%",  BINOP_REM, PREC_MUL, 0},
  341.     {"@",  BINOP_REPEAT, PREC_REPEAT, 0},
  342.     {"-",  UNOP_NEG, PREC_PREFIX, 0},
  343.     {"!",  UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
  344.     {"~",  UNOP_COMPLEMENT, PREC_PREFIX, 0},
  345.     {"*",  UNOP_IND, PREC_PREFIX, 0},
  346.     {"&",  UNOP_ADDR, PREC_PREFIX, 0},
  347.     {"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0},
  348.     {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0},
  349.     {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0},
  350.     {NULL, OP_NULL, PREC_NULL, 0}
  351. };

  353. ‌const struct language_defn objc_language_defn = {
  354.   "objective-c",                /* Language name */
  355.   "Objective-C",
  356.   language_objc,
  357.   range_check_off,
  358.   case_sensitive_on,
  359.   array_row_major,
  360.   macro_expansion_c,
  361.   &exp_descriptor_standard,
  362.   c_parse,
  363.   c_error,
  364.   null_post_parser,
  365.   c_printchar,                       /* Print a character constant */
  366.   c_printstr,                       /* Function to print string constant */
  367.   c_emit_char,
  368.   c_print_type,                        /* Print a type using appropriate syntax */
  369.   c_print_typedef,                /* Print a typedef using appropriate syntax */
  370.   c_val_print,                        /* Print a value using appropriate syntax */
  371.   c_value_print,                /* Print a top-level value */
  372.   default_read_var_value,        /* la_read_var_value */
  373.   objc_skip_trampoline,         /* Language specific skip_trampoline */
  374.   "self",                        /* name_of_this */
  375.   basic_lookup_symbol_nonlocal,        /* lookup_symbol_nonlocal */
  376.   basic_lookup_transparent_type,/* lookup_transparent_type */
  377.   objc_demangle,                /* Language specific symbol demangler */
  378.   NULL,                                /* Language specific
  379.                                    class_name_from_physname */
  380.   objc_op_print_tab,                /* Expression operators for printing */
  381.   1,                                /* C-style arrays */
  382.   0,                                /* String lower bound */
  383.   default_word_break_characters,
  384.   default_make_symbol_completion_list,
  385.   c_language_arch_info,
  386.   default_print_array_index,
  387.   default_pass_by_reference,
  388.   default_get_string,
  389.   NULL,                                /* la_get_symbol_name_cmp */
  390.   iterate_over_symbols,
  391.   &default_varobj_ops,
  392.   NULL,
  393.   NULL,
  394.   LANG_MAGIC
  395. };

  397. /*
  398. * ObjC:
  399. * Following functions help construct Objective-C message calls.
  400. */

  402. ‌struct selname                /* For parsing Objective-C.  */
  403.   {
  404.     struct selname *next;
  405.     char *msglist_sel;
  406.     int msglist_len;
  407.   };

  409. ‌static int msglist_len;
  410. ‌static struct selname *selname_chain;
  411. ‌static char *msglist_sel;

  413. void
  414. ‌start_msglist(void)
  415. {
  416.   struct selname *new =
  417.     (struct selname *) xmalloc (sizeof (struct selname));

  419.   new->next = selname_chain;
  420.   new->msglist_len = msglist_len;
  421.   new->msglist_sel = msglist_sel;
  422.   msglist_len = 0;
  423.   msglist_sel = (char *)xmalloc(1);
  424.   *msglist_sel = 0;
  425.   selname_chain = new;
  426. }

  428. void
  429. ‌add_msglist(struct stoken *str, int addcolon)
  430. {
  431.   char *s;
  432.   const char *p;
  433.   int len, plen;

  435.   if (str == 0)                        /* Unnamed arg, or...  */
  436.     {
  437.       if (addcolon == 0)        /* variable number of args.  */
  438.         {
  439.           msglist_len++;
  440.           return;
  441.         }
  442.       p = "";
  443.       plen = 0;
  444.     }
  445.   else
  446.     {
  447.       p = str->ptr;
  448.       plen = str->length;
  449.     }
  450.   len = plen + strlen(msglist_sel) + 2;
  451.   s = (char *)xmalloc(len);
  452.   strcpy(s, msglist_sel);
  453.   strncat(s, p, plen);
  454.   xfree(msglist_sel);
  455.   msglist_sel = s;
  456.   if (addcolon)
  457.     {
  458.       s[len-2] = ':';
  459.       s[len-1] = 0;
  460.       msglist_len++;
  461.     }
  462.   else
  463.     s[len-2] = '\0';
  464. }

  466. int
  467. ‌end_msglist (struct parser_state *ps)
  468. {
  469.   int val = msglist_len;
  470.   struct selname *sel = selname_chain;
  471.   char *p = msglist_sel;
  472.   CORE_ADDR selid;

  474.   selname_chain = sel->next;
  475.   msglist_len = sel->msglist_len;
  476.   msglist_sel = sel->msglist_sel;
  477.   selid = lookup_child_selector (parse_gdbarch (ps), p);
  478.   if (!selid)
  479.     error (_("Can't find selector \"%s\""), p);
  480.   write_exp_elt_longcst (ps, selid);
  481.   xfree(p);
  482.   write_exp_elt_longcst (ps, val);        /* Number of args */
  483.   xfree(sel);

  485.   return val;
  486. }

  488. /*
  489. * Function: specialcmp (const char *a, const char *b)
  490. *
  491. * Special strcmp: treats ']' and ' ' as end-of-string.
  492. * Used for qsorting lists of objc methods (either by class or selector).
  493. */

  495. static int
  496. ‌specialcmp (const char *a, const char *b)
  497. {
  498.   while (*a && *a != ' ' && *a != ']' && *b && *b != ' ' && *b != ']')
  499.     {
  500.       if (*a != *b)
  501.         return *a - *b;
  502.       a++, b++;
  503.     }
  504.   if (*a && *a != ' ' && *a != ']')
  505.     return  1;                /* a is longer therefore greater.  */
  506.   if (*b && *b != ' ' && *b != ']')
  507.     return -1;                /* a is shorter therefore lesser.  */
  508.   return    0;                /* a and b are identical.  */
  509. }

  511. /*
  512. * Function: compare_selectors (const void *, const void *)
  513. *
  514. * Comparison function for use with qsort.  Arguments are symbols or
  515. * msymbols Compares selector part of objc method name alphabetically.
  516. */

  518. static int
  519. ‌compare_selectors (const void *a, const void *b)
  520. {
  521.   const char *aname, *bname;

  523.   aname = SYMBOL_PRINT_NAME (*(struct symbol **) a);
  524.   bname = SYMBOL_PRINT_NAME (*(struct symbol **) b);
  525.   if (aname == NULL || bname == NULL)
  526.     error (_("internal: compare_selectors(1)"));

  528.   aname = strchr(aname, ' ');
  529.   bname = strchr(bname, ' ');
  530.   if (aname == NULL || bname == NULL)
  531.     error (_("internal: compare_selectors(2)"));

  533.   return specialcmp (aname+1, bname+1);
  534. }

  536. /*
  537. * Function: selectors_info (regexp, from_tty)
  538. *
  539. * Implements the "Info selectors" command.  Takes an optional regexp
  540. * arg.  Lists all objective c selectors that match the regexp.  Works
  541. * by grepping thru all symbols for objective c methods.  Output list
  542. * is sorted and uniqued.
  543. */

  545. static void
  546. ‌selectors_info (char *regexp, int from_tty)
  547. {
  548.   struct objfile        *objfile;
  549.   struct minimal_symbol *msymbol;
  550.   const char            *name;
  551.   char                  *val;
  552.   int                    matches = 0;
  553.   int                    maxlen  = 0;
  554.   int                    ix;
  555.   char                   myregexp[2048];
  556.   char                   asel[256];
  557.   struct symbol        **sym_arr;
  558.   int                    plusminus = 0;

  560.   if (regexp == NULL)
  561.     strcpy(myregexp, ".*]");        /* Null input, match all objc methods.  */
  562.   else
  563.     {
  564.       if (*regexp == '+' || *regexp == '-')
  565.         { /* User wants only class methods or only instance methods.  */
  566.           plusminus = *regexp++;
  567.           while (*regexp == ' ' || *regexp == '\t')
  568.             regexp++;
  569.         }
  570.       if (*regexp == '\0')
  571.         strcpy(myregexp, ".*]");
  572.       else
  573.         {
  574.           /* Allow a few extra bytes because of the strcat below.  */
  575.           if (sizeof (myregexp) < strlen (regexp) + 4)
  576.             error (_("Regexp is too long: %s"), regexp);
  577.           strcpy(myregexp, regexp);
  578.           if (myregexp[strlen(myregexp) - 1] == '$') /* end of selector */
  579.             myregexp[strlen(myregexp) - 1] = ']';    /* end of method name */
  580.           else
  581.             strcat(myregexp, ".*]");
  582.         }
  583.     }

  585.   if (regexp != NULL)
  586.     {
  587.       val = re_comp (myregexp);
  588.       if (val != 0)
  589.         error (_("Invalid regexp (%s): %s"), val, regexp);
  590.     }

  592.   /* First time thru is JUST to get max length and count.  */
  593.   ALL_MSYMBOLS (objfile, msymbol)
  594.     {
  595.       QUIT;
  596.       name = MSYMBOL_NATURAL_NAME (msymbol);
  597.       if (name
  598.           && (name[0] == '-' || name[0] == '+')
  599.           && name[1] == '[')                /* Got a method name.  */
  600.         {
  601.           /* Filter for class/instance methods.  */
  602.           if (plusminus && name[0] != plusminus)
  603.             continue;
  604.           /* Find selector part.  */
  605.           name = (char *) strchr (name+2, ' ');
  606.           if (name == NULL)
  607.             {
  608.               complaint (&symfile_complaints,
  609.                          _("Bad method name '%s'"),
  610.                          MSYMBOL_NATURAL_NAME (msymbol));
  611.               continue;
  612.             }
  613.           if (regexp == NULL || re_exec(++name) != 0)
  614.             {
  615.               const char *mystart = name;
  616.               const char *myend   = strchr (mystart, ']');

  618.               if (myend && (myend - mystart > maxlen))
  619.                 maxlen = myend - mystart;        /* Get longest selector.  */
  620.               matches++;
  621.             }
  622.         }
  623.     }
  624.   if (matches)
  625.     {
  626.       printf_filtered (_("Selectors matching \"%s\":\n\n"),
  627.                        regexp ? regexp : "*");

  629.       sym_arr = alloca (matches * sizeof (struct symbol *));
  630.       matches = 0;
  631.       ALL_MSYMBOLS (objfile, msymbol)
  632.         {
  633.           QUIT;
  634.           name = MSYMBOL_NATURAL_NAME (msymbol);
  635.           if (name &&
  636.              (name[0] == '-' || name[0] == '+') &&
  637.               name[1] == '[')                /* Got a method name.  */
  638.             {
  639.               /* Filter for class/instance methods.  */
  640.               if (plusminus && name[0] != plusminus)
  641.                 continue;
  642.               /* Find selector part.  */
  643.               name = (char *) strchr(name+2, ' ');
  644.               if (regexp == NULL || re_exec(++name) != 0)
  645.                 sym_arr[matches++] = (struct symbol *) msymbol;
  646.             }
  647.         }

  649.       qsort (sym_arr, matches, sizeof (struct minimal_symbol *),
  650.              compare_selectors);
  651.       /* Prevent compare on first iteration.  */
  652.       asel[0] = 0;
  653.       for (ix = 0; ix < matches; ix++)        /* Now do the output.  */
  654.         {
  655.           char *p = asel;

  657.           QUIT;
  658.           name = SYMBOL_NATURAL_NAME (sym_arr[ix]);
  659.           name = strchr (name, ' ') + 1;
  660.           if (p[0] && specialcmp(name, p) == 0)
  661.             continue;                /* Seen this one already (not unique).  */

  663.           /* Copy selector part.  */
  664.           while (*name && *name != ']')
  665.             *p++ = *name++;
  666.           *p++ = '\0';
  667.           /* Print in columns.  */
  668.           puts_filtered_tabular(asel, maxlen + 1, 0);
  669.         }
  670.       begin_line();
  671.     }
  672.   else
  673.     printf_filtered (_("No selectors matching \"%s\"\n"),
  674.                      regexp ? regexp : "*");
  675. }

  677. /*
  678. * Function: compare_classes (const void *, const void *)
  679. *
  680. * Comparison function for use with qsort.  Arguments are symbols or
  681. * msymbols Compares class part of objc method name alphabetically.
  682. */

  684. static int
  685. ‌compare_classes (const void *a, const void *b)
  686. {
  687.   const char *aname, *bname;

  689.   aname = SYMBOL_PRINT_NAME (*(struct symbol **) a);
  690.   bname = SYMBOL_PRINT_NAME (*(struct symbol **) b);
  691.   if (aname == NULL || bname == NULL)
  692.     error (_("internal: compare_classes(1)"));

  694.   return specialcmp (aname+1, bname+1);
  695. }

  697. /*
  698. * Function: classes_info(regexp, from_tty)
  699. *
  700. * Implements the "info classes" command for objective c classes.
  701. * Lists all objective c classes that match the optional regexp.
  702. * Works by grepping thru the list of objective c methods.  List will
  703. * be sorted and uniqued (since one class may have many methods).
  704. * BUGS: will not list a class that has no methods.
  705. */

  707. static void
  708. ‌classes_info (char *regexp, int from_tty)
  709. {
  710.   struct objfile        *objfile;
  711.   struct minimal_symbol *msymbol;
  712.   const char            *name;
  713.   char                  *val;
  714.   int                    matches = 0;
  715.   int                    maxlen  = 0;
  716.   int                    ix;
  717.   char                   myregexp[2048];
  718.   char                   aclass[256];
  719.   struct symbol        **sym_arr;

  721.   if (regexp == NULL)
  722.     strcpy(myregexp, ".* ");        /* Null input: match all objc classes.  */
  723.   else
  724.     {
  725.       /* Allow a few extra bytes because of the strcat below.  */
  726.       if (sizeof (myregexp) < strlen (regexp) + 4)
  727.         error (_("Regexp is too long: %s"), regexp);
  728.       strcpy(myregexp, regexp);
  729.       if (myregexp[strlen(myregexp) - 1] == '$')
  730.         /* In the method name, the end of the class name is marked by ' '.  */
  731.         myregexp[strlen(myregexp) - 1] = ' ';
  732.       else
  733.         strcat(myregexp, ".* ");
  734.     }

  736.   if (regexp != NULL)
  737.     {
  738.       val = re_comp (myregexp);
  739.       if (val != 0)
  740.         error (_("Invalid regexp (%s): %s"), val, regexp);
  741.     }

  743.   /* First time thru is JUST to get max length and count.  */
  744.   ALL_MSYMBOLS (objfile, msymbol)
  745.     {
  746.       QUIT;
  747.       name = MSYMBOL_NATURAL_NAME (msymbol);
  748.       if (name &&
  749.          (name[0] == '-' || name[0] == '+') &&
  750.           name[1] == '[')                        /* Got a method name.  */
  751.         if (regexp == NULL || re_exec(name+2) != 0)
  752.           {
  753.             /* Compute length of classname part.  */
  754.             const char *mystart = name + 2;
  755.             const char *myend   = strchr (mystart, ' ');

  757.             if (myend && (myend - mystart > maxlen))
  758.               maxlen = myend - mystart;
  759.             matches++;
  760.           }
  761.     }
  762.   if (matches)
  763.     {
  764.       printf_filtered (_("Classes matching \"%s\":\n\n"),
  765.                        regexp ? regexp : "*");
  766.       sym_arr = alloca (matches * sizeof (struct symbol *));
  767.       matches = 0;
  768.       ALL_MSYMBOLS (objfile, msymbol)
  769.         {
  770.           QUIT;
  771.           name = MSYMBOL_NATURAL_NAME (msymbol);
  772.           if (name &&
  773.              (name[0] == '-' || name[0] == '+') &&
  774.               name[1] == '[')                        /* Got a method name.  */
  775.             if (regexp == NULL || re_exec(name+2) != 0)
  776.                 sym_arr[matches++] = (struct symbol *) msymbol;
  777.         }

  779.       qsort (sym_arr, matches, sizeof (struct minimal_symbol *),
  780.              compare_classes);
  781.       /* Prevent compare on first iteration.  */
  782.       aclass[0] = 0;
  783.       for (ix = 0; ix < matches; ix++)        /* Now do the output.  */
  784.         {
  785.           char *p = aclass;

  787.           QUIT;
  788.           name = SYMBOL_NATURAL_NAME (sym_arr[ix]);
  789.           name += 2;
  790.           if (p[0] && specialcmp(name, p) == 0)
  791.             continue;        /* Seen this one already (not unique).  */

  793.           /* Copy class part of method name.  */
  794.           while (*name && *name != ' ')
  795.             *p++ = *name++;
  796.           *p++ = '\0';
  797.           /* Print in columns.  */
  798.           puts_filtered_tabular(aclass, maxlen + 1, 0);
  799.         }
  800.       begin_line();
  801.     }
  802.   else
  803.     printf_filtered (_("No classes matching \"%s\"\n"), regexp ? regexp : "*");
  804. }

  806. static char *
  807. ‌parse_selector (char *method, char **selector)
  808. {
  809.   char *s1 = NULL;
  810.   char *s2 = NULL;
  811.   int found_quote = 0;

  813.   char *nselector = NULL;

  815.   gdb_assert (selector != NULL);

  817.   s1 = method;

  819.   s1 = skip_spaces (s1);
  820.   if (*s1 == '\'')
  821.     {
  822.       found_quote = 1;
  823.       s1++;
  824.     }
  825.   s1 = skip_spaces (s1);

  827.   nselector = s1;
  828.   s2 = s1;

  830.   for (;;)
  831.     {
  832.       if (isalnum (*s2) || (*s2 == '_') || (*s2 == ':'))
  833.         *s1++ = *s2;
  834.       else if (isspace (*s2))
  835.         ;
  836.       else if ((*s2 == '\0') || (*s2 == '\''))
  837.         break;
  838.       else
  839.         return NULL;
  840.       s2++;
  841.     }
  842.   *s1++ = '\0';

  844.   s2 = skip_spaces (s2);
  845.   if (found_quote)
  846.     {
  847.       if (*s2 == '\'')
  848.         s2++;
  849.       s2 = skip_spaces (s2);
  850.     }

  852.   if (selector != NULL)
  853.     *selector = nselector;

  855.   return s2;
  856. }

  858. static char *
  859. ‌parse_method (char *method, char *type, char **class,
  860.               char **category, char **selector)
  861. {
  862.   char *s1 = NULL;
  863.   char *s2 = NULL;
  864.   int found_quote = 0;

  866.   char ntype = '\0';
  867.   char *nclass = NULL;
  868.   char *ncategory = NULL;
  869.   char *nselector = NULL;

  871.   gdb_assert (type != NULL);
  872.   gdb_assert (class != NULL);
  873.   gdb_assert (category != NULL);
  874.   gdb_assert (selector != NULL);

  876.   s1 = method;

  878.   s1 = skip_spaces (s1);
  879.   if (*s1 == '\'')
  880.     {
  881.       found_quote = 1;
  882.       s1++;
  883.     }
  884.   s1 = skip_spaces (s1);

  886.   if ((s1[0] == '+') || (s1[0] == '-'))
  887.     ntype = *s1++;

  889.   s1 = skip_spaces (s1);

  891.   if (*s1 != '[')
  892.     return NULL;
  893.   s1++;

  895.   nclass = s1;
  896.   while (isalnum (*s1) || (*s1 == '_'))
  897.     s1++;

  899.   s2 = s1;
  900.   s2 = skip_spaces (s2);

  902.   if (*s2 == '(')
  903.     {
  904.       s2++;
  905.       s2 = skip_spaces (s2);
  906.       ncategory = s2;
  907.       while (isalnum (*s2) || (*s2 == '_'))
  908.         s2++;
  909.       *s2++ = '\0';
  910.     }

  912.   /* Truncate the class name now that we're not using the open paren.  */
  913.   *s1++ = '\0';

  915.   nselector = s2;
  916.   s1 = s2;

  918.   for (;;)
  919.     {
  920.       if (isalnum (*s2) || (*s2 == '_') || (*s2 == ':'))
  921.         *s1++ = *s2;
  922.       else if (isspace (*s2))
  923.         ;
  924.       else if (*s2 == ']')
  925.         break;
  926.       else
  927.         return NULL;
  928.       s2++;
  929.     }
  930.   *s1++ = '\0';
  931.   s2++;

  933.   s2 = skip_spaces (s2);
  934.   if (found_quote)
  935.     {
  936.       if (*s2 != '\'')
  937.         return NULL;
  938.       s2++;
  939.       s2 = skip_spaces (s2);
  940.     }

  942.   if (type != NULL)
  943.     *type = ntype;
  944.   if (class != NULL)
  945.     *class = nclass;
  946.   if (category != NULL)
  947.     *category = ncategory;
  948.   if (selector != NULL)
  949.     *selector = nselector;

  951.   return s2;
  952. }

  954. static void
  955. ‌find_methods (char type, const char *class, const char *category,
  956.               const char *selector,
  957.               VEC (const_char_ptr) **symbol_names)
  958. {
  959.   struct objfile *objfile = NULL;

  961.   const char *symname = NULL;

  963.   char ntype = '\0';
  964.   char *nclass = NULL;
  965.   char *ncategory = NULL;
  966.   char *nselector = NULL;

  968.   static char *tmp = NULL;
  969.   static unsigned int tmplen = 0;

  971.   gdb_assert (symbol_names != NULL);

  973.   ALL_OBJFILES (objfile)
  974.     {
  975.       unsigned int *objc_csym;
  976.       struct minimal_symbol *msymbol = NULL;

  978.       /* The objfile_csym variable counts the number of ObjC methods
  979.          that this objfile defines.  We save that count as a private
  980.          objfile data.        If we have already determined that this objfile
  981.          provides no ObjC methods, we can skip it entirely.  */

  983.       unsigned int objfile_csym = 0;

  985.       objc_csym = objfile_data (objfile, objc_objfile_data);
  986.       if (objc_csym != NULL && *objc_csym == 0)
  987.         /* There are no ObjC symbols in this objfile.  Skip it entirely.  */
  988.         continue;

  990.       ALL_OBJFILE_MSYMBOLS (objfile, msymbol)
  991.         {
  992.           QUIT;

  994.           /* Check the symbol name first as this can be done entirely without
  995.              sending any query to the target.  */
  996.           symname = MSYMBOL_NATURAL_NAME (msymbol);
  997.           if (symname == NULL)
  998.             continue;

  1000.           if ((symname[0] != '-' && symname[0] != '+') || (symname[1] != '['))
  1001.             /* Not a method name.  */
  1002.             continue;

  1004.           objfile_csym++;

  1006.           /* Now that thinks are a bit sane, clean up the symname.  */
  1007.           while ((strlen (symname) + 1) >= tmplen)
  1008.             {
  1009.               tmplen = (tmplen == 0) ? 1024 : tmplen * 2;
  1010.               tmp = xrealloc (tmp, tmplen);
  1011.             }
  1012.           strcpy (tmp, symname);

  1014.           if (parse_method (tmp, &ntype, &nclass,
  1015.                             &ncategory, &nselector) == NULL)
  1016.             continue;

  1018.           if ((type != '\0') && (ntype != type))
  1019.             continue;

  1021.           if ((class != NULL)
  1022.               && ((nclass == NULL) || (strcmp (class, nclass) != 0)))
  1023.             continue;

  1025.           if ((category != NULL) &&
  1026.               ((ncategory == NULL) || (strcmp (category, ncategory) != 0)))
  1027.             continue;

  1029.           if ((selector != NULL) &&
  1030.               ((nselector == NULL) || (strcmp (selector, nselector) != 0)))
  1031.             continue;

  1033.           VEC_safe_push (const_char_ptr, *symbol_names, symname);
  1034.         }

  1036.       if (objc_csym == NULL)
  1037.         {
  1038.           objc_csym = obstack_alloc (&objfile->objfile_obstack,
  1039.                                      sizeof (*objc_csym));
  1040.           *objc_csym = objfile_csym;
  1041.           set_objfile_data (objfile, objc_objfile_data, objc_csym);
  1042.         }
  1043.       else
  1044.         /* Count of ObjC methods in this objfile should be constant.  */
  1045.         gdb_assert (*objc_csym == objfile_csym);
  1046.     }
  1047. }

  1049. /* Uniquify a VEC of strings.  */

  1051. static void
  1052. ‌uniquify_strings (VEC (const_char_ptr) **strings)
  1053. {
  1054.   int ix;
  1055.   const char *elem, *last = NULL;
  1056.   int out;

  1058.   /* If the vector is empty, there's nothing to do.  This explicit
  1059.      check is needed to avoid invoking qsort with NULL. */
  1060.   if (VEC_empty (const_char_ptr, *strings))
  1061.     return;

  1063.   qsort (VEC_address (const_char_ptr, *strings),
  1064.          VEC_length (const_char_ptr, *strings),
  1065.          sizeof (const_char_ptr),
  1066.          compare_strings);
  1067.   out = 0;
  1068.   for (ix = 0; VEC_iterate (const_char_ptr, *strings, ix, elem); ++ix)
  1069.     {
  1070.       if (last == NULL || strcmp (last, elem) != 0)
  1071.         {
  1072.           /* Keep ELEM.  */
  1073.           VEC_replace (const_char_ptr, *strings, out, elem);
  1074.           ++out;
  1075.         }
  1076.       last = elem;
  1077.     }
  1078.   VEC_truncate (const_char_ptr, *strings, out);
  1079. }

  1081. /*
  1082. * Function: find_imps (const char *selector, struct symbol **sym_arr)
  1083. *
  1084. * Input:  a string representing a selector
  1085. *         a pointer to an array of symbol pointers
  1086. *         possibly a pointer to a symbol found by the caller.
  1087. *
  1088. * Output: number of methods that implement that selector.  Side
  1089. * effects: The array of symbol pointers is filled with matching syms.
  1090. *
  1091. * By analogy with function "find_methods" (symtab.c), builds a list
  1092. * of symbols matching the ambiguous input, so that "decode_line_2"
  1093. * (symtab.c) can list them and ask the user to choose one or more.
  1094. * In this case the matches are objective c methods
  1095. * ("implementations") matching an objective c selector.
  1096. *
  1097. * Note that it is possible for a normal (c-style) function to have
  1098. * the same name as an objective c selector.  To prevent the selector
  1099. * from eclipsing the function, we allow the caller (decode_line_1) to
  1100. * search for such a function first, and if it finds one, pass it in
  1101. * to us.  We will then integrate it into the list.  We also search
  1102. * for one here, among the minsyms.
  1103. *
  1104. * NOTE: if NUM_DEBUGGABLE is non-zero, the sym_arr will be divided
  1105. *       into two parts: debuggable (struct symbol) syms, and
  1106. *       non_debuggable (struct minimal_symbol) syms.  The debuggable
  1107. *       ones will come first, before NUM_DEBUGGABLE (which will thus
  1108. *       be the index of the first non-debuggable one).
  1109. */

  1111. const char *
  1112. ‌find_imps (const char *method, VEC (const_char_ptr) **symbol_names)
  1113. {
  1114.   char type = '\0';
  1115.   char *class = NULL;
  1116.   char *category = NULL;
  1117.   char *selector = NULL;

  1119.   char *buf = NULL;
  1120.   char *tmp = NULL;

  1122.   int selector_case = 0;

  1124.   gdb_assert (symbol_names != NULL);

  1126.   buf = (char *) alloca (strlen (method) + 1);
  1127.   strcpy (buf, method);
  1128.   tmp = parse_method (buf, &type, &class, &category, &selector);

  1130.   if (tmp == NULL)
  1131.     {
  1132.       strcpy (buf, method);
  1133.       tmp = parse_selector (buf, &selector);

  1135.       if (tmp == NULL)
  1136.         return NULL;

  1138.       selector_case = 1;
  1139.     }

  1141.   find_methods (type, class, category, selector, symbol_names);

  1143.   /* If we hit the "selector" case, and we found some methods, then
  1144.      add the selector itself as a symbol, if it exists.  */
  1145.   if (selector_case && !VEC_empty (const_char_ptr, *symbol_names))
  1146.     {
  1147.       struct symbol *sym = lookup_symbol (selector, NULL, VAR_DOMAIN, 0);

  1149.       if (sym != NULL)
  1150.         VEC_safe_push (const_char_ptr, *symbol_names,
  1151.                        SYMBOL_NATURAL_NAME (sym));
  1152.       else
  1153.         {
  1154.           struct bound_minimal_symbol msym
  1155.             = lookup_minimal_symbol (selector, 0, 0);

  1157.           if (msym.minsym != NULL)
  1158.             VEC_safe_push (const_char_ptr, *symbol_names,
  1159.                            MSYMBOL_NATURAL_NAME (msym.minsym));
  1160.         }
  1161.     }

  1163.   uniquify_strings (symbol_names);

  1165.   return method + (tmp - buf);
  1166. }

  1168. static void
  1169. ‌print_object_command (char *args, int from_tty)
  1170. {
  1171.   struct value *object, *function, *description;
  1172.   CORE_ADDR string_addr, object_addr;
  1173.   int i = 0;
  1174.   gdb_byte c = 0;

  1176.   if (!args || !*args)
  1177.     error (
  1178. "The 'print-object' command requires an argument (an Objective-C object)");

  1180.   {
  1181.     struct expression *expr = parse_expression (args);
  1182.     struct cleanup *old_chain =
  1183.       make_cleanup (free_current_contents, &expr);
  1184.     int pc = 0;

  1186.     object = evaluate_subexp (builtin_type (expr->gdbarch)->builtin_data_ptr,
  1187.                               expr, &pc, EVAL_NORMAL);
  1188.     do_cleanups (old_chain);
  1189.   }

  1191.   /* Validate the address for sanity.  */
  1192.   object_addr = value_as_long (object);
  1193.   read_memory (object_addr, &c, 1);

  1195.   function = find_function_in_inferior ("_NSPrintForDebugger", NULL);
  1196.   if (function == NULL)
  1197.     error (_("Unable to locate _NSPrintForDebugger in child process"));

  1199.   description = call_function_by_hand (function, 1, &object);

  1201.   string_addr = value_as_long (description);
  1202.   if (string_addr == 0)
  1203.     error (_("object returns null description"));

  1205.   read_memory (string_addr + i++, &c, 1);
  1206.   if (c != 0)
  1207.     do
  1208.       { /* Read and print characters up to EOS.  */
  1209.         QUIT;
  1210.         printf_filtered ("%c", c);
  1211.         read_memory (string_addr + i++, &c, 1);
  1212.       } while (c != 0);
  1213.   else
  1214.     printf_filtered(_("<object returns empty description>"));
  1215.   printf_filtered ("\n");
  1216. }

  1218. /* The data structure 'methcalls' is used to detect method calls (thru
  1219. * ObjC runtime lib functions objc_msgSend, objc_msgSendSuper, etc.),
  1220. * and ultimately find the method being called.
  1221. */

  1223. ‌struct objc_methcall {
  1224.   char *name;
  1225. /* Return instance method to be called.  */
  1226.   int (*stop_at) (CORE_ADDR, CORE_ADDR *);
  1227.   /* Start of pc range corresponding to method invocation.  */
  1228.   CORE_ADDR begin;
  1229.   /* End of pc range corresponding to method invocation.  */
  1230.   CORE_ADDR end;
  1231. };

  1233. static int resolve_msgsend (CORE_ADDR pc, CORE_ADDR *new_pc);
  1234. static int resolve_msgsend_stret (CORE_ADDR pc, CORE_ADDR *new_pc);
  1235. static int resolve_msgsend_super (CORE_ADDR pc, CORE_ADDR *new_pc);
  1236. static int resolve_msgsend_super_stret (CORE_ADDR pc, CORE_ADDR *new_pc);

  1238. ‌static struct objc_methcall methcalls[] = {
  1239.   { "_objc_msgSend", resolve_msgsend, 0, 0},
  1240.   { "_objc_msgSend_stret", resolve_msgsend_stret, 0, 0},
  1241.   { "_objc_msgSendSuper", resolve_msgsend_super, 0, 0},
  1242.   { "_objc_msgSendSuper_stret", resolve_msgsend_super_stret, 0, 0},
  1243.   { "_objc_getClass", NULL, 0, 0},
  1244.   { "_objc_getMetaClass", NULL, 0, 0}
  1245. };

  1247. ‌#define nmethcalls (sizeof (methcalls) / sizeof (methcalls[0]))

  1249. /* The following function, "find_objc_msgsend", fills in the data
  1250. * structure "objc_msgs" by finding the addresses of each of the
  1251. * (currently four) functions that it holds (of which objc_msgSend is
  1252. * the first).  This must be called each time symbols are loaded, in
  1253. * case the functions have moved for some reason.
  1254. */

  1256. static void
  1257. ‌find_objc_msgsend (void)
  1258. {
  1259.   unsigned int i;

  1261.   for (i = 0; i < nmethcalls; i++)
  1262.     {
  1263.       struct bound_minimal_symbol func;

  1265.       /* Try both with and without underscore.  */
  1266.       func = lookup_bound_minimal_symbol (methcalls[i].name);
  1267.       if ((func.minsym == NULL) && (methcalls[i].name[0] == '_'))
  1268.         {
  1269.           func = lookup_bound_minimal_symbol (methcalls[i].name + 1);
  1270.         }
  1271.       if (func.minsym == NULL)
  1272.         {
  1273.           methcalls[i].begin = 0;
  1274.           methcalls[i].end = 0;
  1275.           continue;
  1276.         }

  1278.       methcalls[i].begin = BMSYMBOL_VALUE_ADDRESS (func);
  1279.       methcalls[i].end = minimal_symbol_upper_bound (func);
  1280.     }
  1281. }

  1283. /* find_objc_msgcall (replaces pc_off_limits)
  1284. *
  1285. * ALL that this function now does is to determine whether the input
  1286. * address ("pc") is the address of one of the Objective-C message
  1287. * dispatch functions (mainly objc_msgSend or objc_msgSendSuper), and
  1288. * if so, it returns the address of the method that will be called.
  1289. *
  1290. * The old function "pc_off_limits" used to do a lot of other things
  1291. * in addition, such as detecting shared library jump stubs and
  1292. * returning the address of the shlib function that would be called.
  1293. * That functionality has been moved into the gdbarch_skip_trampoline_code and
  1294. * IN_SOLIB_TRAMPOLINE macros, which are resolved in the target-
  1295. * dependent modules.
  1296. */

  1298. ‌struct objc_submethod_helper_data {
  1299.   int (*f) (CORE_ADDR, CORE_ADDR *);
  1300.   CORE_ADDR pc;
  1301.   CORE_ADDR *new_pc;
  1302. };

  1304. static int
  1305. ‌find_objc_msgcall_submethod_helper (void * arg)
  1306. {
  1307.   struct objc_submethod_helper_data *s =
  1308.     (struct objc_submethod_helper_data *) arg;

  1310.   if (s->f (s->pc, s->new_pc) == 0)
  1311.     return 1;
  1312.   else
  1313.     return 0;
  1314. }

  1316. static int
  1317. ‌find_objc_msgcall_submethod (int (*f) (CORE_ADDR, CORE_ADDR *),
  1318.                              CORE_ADDR pc,
  1319.                              CORE_ADDR *new_pc)
  1320. {
  1321.   struct objc_submethod_helper_data s;

  1323.   s.f = f;
  1324.   s.pc = pc;
  1325.   s.new_pc = new_pc;

  1327.   if (catch_errors (find_objc_msgcall_submethod_helper,
  1328.                     (void *) &s,
  1329.                     "Unable to determine target of "
  1330.                     "Objective-C method call (ignoring):\n",
  1331.                     RETURN_MASK_ALL) == 0)
  1332.     return 1;
  1333.   else
  1334.     return 0;
  1335. }

  1337. int
  1338. ‌find_objc_msgcall (CORE_ADDR pc, CORE_ADDR *new_pc)
  1339. {
  1340.   unsigned int i;

  1342.   find_objc_msgsend ();
  1343.   if (new_pc != NULL)
  1344.     {
  1345.       *new_pc = 0;
  1346.     }

  1348.   for (i = 0; i < nmethcalls; i++)
  1349.     if ((pc >= methcalls[i].begin) && (pc < methcalls[i].end))
  1350.       {
  1351.         if (methcalls[i].stop_at != NULL)
  1352.           return find_objc_msgcall_submethod (methcalls[i].stop_at,
  1353.                                               pc, new_pc);
  1354.         else
  1355.           return 0;
  1356.       }

  1358.   return 0;
  1359. }

  1361. /* -Wmissing-prototypes */
  1362. extern initialize_file_ftype _initialize_objc_language;

  1364. void
  1365. ‌_initialize_objc_language (void)
  1366. {
  1367.   add_language (&objc_language_defn);
  1368.   add_info ("selectors", selectors_info,    /* INFO SELECTORS command.  */
  1369.             _("All Objective-C selectors, or those matching REGEXP."));
  1370.   add_info ("classes", classes_info,             /* INFO CLASSES   command.  */
  1371.             _("All Objective-C classes, or those matching REGEXP."));
  1372.   add_com ("print-object", class_vars, print_object_command,
  1373.            _("Ask an Objective-C object to print itself."));
  1374.   add_com_alias ("po", "print-object", class_vars, 1);
  1375. }

  1377. static void
  1378. ‌read_objc_method (struct gdbarch *gdbarch, CORE_ADDR addr,
  1379.                   struct objc_method *method)
  1380. {
  1381.   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

  1383.   method->name  = read_memory_unsigned_integer (addr + 0, 4, byte_order);
  1384.   method->types = read_memory_unsigned_integer (addr + 4, 4, byte_order);
  1385.   method->imp   = read_memory_unsigned_integer (addr + 8, 4, byte_order);
  1386. }

  1388. static unsigned long
  1389. ‌read_objc_methlist_nmethods (struct gdbarch *gdbarch, CORE_ADDR addr)
  1390. {
  1391.   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

  1393.   return read_memory_unsigned_integer (addr + 4, 4, byte_order);
  1394. }

  1396. static void
  1397. ‌read_objc_methlist_method (struct gdbarch *gdbarch, CORE_ADDR addr,
  1398.                            unsigned long num, struct objc_method *method)
  1399. {
  1400.   gdb_assert (num < read_objc_methlist_nmethods (gdbarch, addr));
  1401.   read_objc_method (gdbarch, addr + 8 + (12 * num), method);
  1402. }

  1404. static void
  1405. ‌read_objc_object (struct gdbarch *gdbarch, CORE_ADDR addr,
  1406.                   struct objc_object *object)
  1407. {
  1408.   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

  1410.   object->isa = read_memory_unsigned_integer (addr, 4, byte_order);
  1411. }

  1413. static void
  1414. ‌read_objc_super (struct gdbarch *gdbarch, CORE_ADDR addr,
  1415.                  struct objc_super *super)
  1416. {
  1417.   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

  1419.   super->receiver = read_memory_unsigned_integer (addr, 4, byte_order);
  1420.   super->class = read_memory_unsigned_integer (addr + 4, 4, byte_order);
  1421. };

  1423. static void
  1424. ‌read_objc_class (struct gdbarch *gdbarch, CORE_ADDR addr,
  1425.                  struct objc_class *class)
  1426. {
  1427.   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

  1429.   class->isa = read_memory_unsigned_integer (addr, 4, byte_order);
  1430.   class->super_class = read_memory_unsigned_integer (addr + 4, 4, byte_order);
  1431.   class->name = read_memory_unsigned_integer (addr + 8, 4, byte_order);
  1432.   class->version = read_memory_unsigned_integer (addr + 12, 4, byte_order);
  1433.   class->info = read_memory_unsigned_integer (addr + 16, 4, byte_order);
  1434.   class->instance_size = read_memory_unsigned_integer (addr + 18, 4,
  1435.                                                        byte_order);
  1436.   class->ivars = read_memory_unsigned_integer (addr + 24, 4, byte_order);
  1437.   class->methods = read_memory_unsigned_integer (addr + 28, 4, byte_order);
  1438.   class->cache = read_memory_unsigned_integer (addr + 32, 4, byte_order);
  1439.   class->protocols = read_memory_unsigned_integer (addr + 36, 4, byte_order);
  1440. }

  1442. static CORE_ADDR
  1443. ‌find_implementation_from_class (struct gdbarch *gdbarch,
  1444.                                 CORE_ADDR class, CORE_ADDR sel)
  1445. {
  1446.   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  1447.   CORE_ADDR subclass = class;

  1449.   while (subclass != 0)
  1450.     {

  1452.       struct objc_class class_str;
  1453.       unsigned mlistnum = 0;

  1455.       read_objc_class (gdbarch, subclass, &class_str);

  1457.       for (;;)
  1458.         {
  1459.           CORE_ADDR mlist;
  1460.           unsigned long nmethods;
  1461.           unsigned long i;

  1463.           mlist = read_memory_unsigned_integer (class_str.methods +
  1464.                                                 (4 * mlistnum),
  1465.                                                 4, byte_order);
  1466.           if (mlist == 0)
  1467.             break;

  1469.           nmethods = read_objc_methlist_nmethods (gdbarch, mlist);

  1471.           for (i = 0; i < nmethods; i++)
  1472.             {
  1473.               struct objc_method meth_str;

  1475.               read_objc_methlist_method (gdbarch, mlist, i, &meth_str);

  1477.               if (meth_str.name == sel)
  1478.                 /* FIXME: hppa arch was doing a pointer dereference
  1479.                    here.  There needs to be a better way to do that.  */
  1480.                 return meth_str.imp;
  1481.             }
  1482.           mlistnum++;
  1483.         }
  1484.       subclass = class_str.super_class;
  1485.     }

  1487.   return 0;
  1488. }

  1490. static CORE_ADDR
  1491. ‌find_implementation (struct gdbarch *gdbarch,
  1492.                      CORE_ADDR object, CORE_ADDR sel)
  1493. {
  1494.   struct objc_object ostr;

  1496.   if (object == 0)
  1497.     return 0;
  1498.   read_objc_object (gdbarch, object, &ostr);
  1499.   if (ostr.isa == 0)
  1500.     return 0;

  1502.   return find_implementation_from_class (gdbarch, ostr.isa, sel);
  1503. }

  1505. static int
  1506. ‌resolve_msgsend (CORE_ADDR pc, CORE_ADDR *new_pc)
  1507. {
  1508.   struct frame_info *frame = get_current_frame ();
  1509.   struct gdbarch *gdbarch = get_frame_arch (frame);
  1510.   struct type *ptr_type = builtin_type (gdbarch)->builtin_func_ptr;

  1512.   CORE_ADDR object;
  1513.   CORE_ADDR sel;
  1514.   CORE_ADDR res;

  1516.   object = gdbarch_fetch_pointer_argument (gdbarch, frame, 0, ptr_type);
  1517.   sel = gdbarch_fetch_pointer_argument (gdbarch, frame, 1, ptr_type);

  1519.   res = find_implementation (gdbarch, object, sel);
  1520.   if (new_pc != 0)
  1521.     *new_pc = res;
  1522.   if (res == 0)
  1523.     return 1;
  1524.   return 0;
  1525. }

  1527. static int
  1528. ‌resolve_msgsend_stret (CORE_ADDR pc, CORE_ADDR *new_pc)
  1529. {
  1530.   struct frame_info *frame = get_current_frame ();
  1531.   struct gdbarch *gdbarch = get_frame_arch (frame);
  1532.   struct type *ptr_type = builtin_type (gdbarch)->builtin_func_ptr;

  1534.   CORE_ADDR object;
  1535.   CORE_ADDR sel;
  1536.   CORE_ADDR res;

  1538.   object = gdbarch_fetch_pointer_argument (gdbarch, frame, 1, ptr_type);
  1539.   sel = gdbarch_fetch_pointer_argument (gdbarch, frame, 2, ptr_type);

  1541.   res = find_implementation (gdbarch, object, sel);
  1542.   if (new_pc != 0)
  1543.     *new_pc = res;
  1544.   if (res == 0)
  1545.     return 1;
  1546.   return 0;
  1547. }

  1549. static int
  1550. ‌resolve_msgsend_super (CORE_ADDR pc, CORE_ADDR *new_pc)
  1551. {
  1552.   struct frame_info *frame = get_current_frame ();
  1553.   struct gdbarch *gdbarch = get_frame_arch (frame);
  1554.   struct type *ptr_type = builtin_type (gdbarch)->builtin_func_ptr;

  1556.   struct objc_super sstr;

  1558.   CORE_ADDR super;
  1559.   CORE_ADDR sel;
  1560.   CORE_ADDR res;

  1562.   super = gdbarch_fetch_pointer_argument (gdbarch, frame, 0, ptr_type);
  1563.   sel = gdbarch_fetch_pointer_argument (gdbarch, frame, 1, ptr_type);

  1565.   read_objc_super (gdbarch, super, &sstr);
  1566.   if (sstr.class == 0)
  1567.     return 0;

  1569.   res = find_implementation_from_class (gdbarch, sstr.class, sel);
  1570.   if (new_pc != 0)
  1571.     *new_pc = res;
  1572.   if (res == 0)
  1573.     return 1;
  1574.   return 0;
  1575. }

  1577. static int
  1578. ‌resolve_msgsend_super_stret (CORE_ADDR pc, CORE_ADDR *new_pc)
  1579. {
  1580.   struct frame_info *frame = get_current_frame ();
  1581.   struct gdbarch *gdbarch = get_frame_arch (frame);
  1582.   struct type *ptr_type = builtin_type (gdbarch)->builtin_func_ptr;

  1584.   struct objc_super sstr;

  1586.   CORE_ADDR super;
  1587.   CORE_ADDR sel;
  1588.   CORE_ADDR res;

  1590.   super = gdbarch_fetch_pointer_argument (gdbarch, frame, 1, ptr_type);
  1591.   sel = gdbarch_fetch_pointer_argument (gdbarch, frame, 2, ptr_type);

  1593.   read_objc_super (gdbarch, super, &sstr);
  1594.   if (sstr.class == 0)
  1595.     return 0;

  1597.   res = find_implementation_from_class (gdbarch, sstr.class, sel);
  1598.   if (new_pc != 0)
  1599.     *new_pc = res;
  1600.   if (res == 0)
  1601.     return 1;
  1602.   return 0;
  1603. }

  1605. /* Provide a prototype to silence -Wmissing-prototypes.  */
  1606. extern initialize_file_ftype _initialize_objc_lang;

  1608. void
  1609. ‌_initialize_objc_lang (void)
  1610. {
  1611.   objc_objfile_data = register_objfile_data ();
  1612. }