gdb/jv-typeprint.c

   1 /* Support for printing Java types for GDB, the GNU debugger.
   2    Copyright (C) 1997-2015 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19
  20 #include "defs.h"
  21 #include "symtab.h"
  22 #include "gdbtypes.h"
  23 #include "value.h"
  24 #include "demangle.h"
  25 #include "gdb-demangle.h"
  26 #include "jv-lang.h"
  27 #include "typeprint.h"
  28 #include "c-lang.h"
  29 #include "cp-abi.h"
  30 #include "cp-support.h"
  31
  32 /* Local functions */
  33
  34 static void java_type_print_base (struct type * type,
  35                                   struct ui_file *stream, int show,
  36                                   int level,
  37                                   const struct type_print_options *flags);
  38
  39 static void
  40 java_type_print_derivation_info (struct ui_file *stream, struct type *type)
  41 {
  42   const char *name;
  43   int i;
  44   int n_bases;
  45   int prev;
  46
  47   n_bases = TYPE_N_BASECLASSES (type);
  48
  49   for (i = 0, prev = 0; i < n_bases; i++)
  50     {
  51       int kind;
  52
  53       kind = BASETYPE_VIA_VIRTUAL (type, i) ? 'I' : 'E';
  54
  55       fputs_filtered (kind == prev ? ", "
  56                       : kind == 'I' ? " implements "
  57                       : " extends ",
  58                       stream);
  59       prev = kind;
  60       name = type_name_no_tag (TYPE_BASECLASS (type, i));
  61
  62       fprintf_filtered (stream, "%s", name ? name : "(null)");
  63     }
  64
  65   if (i > 0)
  66     fputs_filtered (" ", stream);
  67 }
  68
  69 /* Print the name of the type (or the ultimate pointer target,
  70    function value or array element), or the description of a
  71    structure or union.
  72
  73    SHOW positive means print details about the type (e.g. enum values),
  74    and print structure elements passing SHOW - 1 for show.
  75    SHOW negative means just print the type name or struct tag if there is one.
  76    If there is no name, print something sensible but concise like
  77    "struct {...}".
  78    SHOW zero means just print the type name or struct tag if there is one.
  79    If there is no name, print something sensible but not as concise like
  80    "struct {int x; int y;}".
  81
  82    LEVEL is the number of spaces to indent by.
  83    We increase it for some recursive calls.  */
  84
  85 static void
  86 java_type_print_base (struct type *type, struct ui_file *stream, int show,
  87                       int level, const struct type_print_options *flags)
  88 {
  89   int i;
  90   int len;
  91   char *mangled_name;
  92   char *demangled_name;
  93
  94   QUIT;
  95   wrap_here ("    ");
  96
  97   if (type == NULL)
  98     {
  99       fputs_filtered ("<type unknown>", stream);
 100       return;
 101     }
 102
 103   /* When SHOW is zero or less, and there is a valid type name, then always
 104      just print the type name directly from the type.  */
 105
 106   if (show <= 0
 107       && TYPE_NAME (type) != NULL)
 108     {
 109       fputs_filtered (TYPE_NAME (type), stream);
 110       return;
 111     }
 112
 113   CHECK_TYPEDEF (type);
 114
 115   switch (TYPE_CODE (type))
 116     {
 117     case TYPE_CODE_PTR:
 118       java_type_print_base (TYPE_TARGET_TYPE (type), stream, show, level,
 119                             flags);
 120       break;
 121
 122     case TYPE_CODE_STRUCT:
 123       if (TYPE_TAG_NAME (type) != NULL && TYPE_TAG_NAME (type)[0] == '[')
 124         {                       /* array type */
 125           char *name = java_demangle_type_signature (TYPE_TAG_NAME (type));
 126
 127           fputs_filtered (name, stream);
 128           xfree (name);
 129           break;
 130         }
 131
 132       if (show >= 0)
 133         fprintf_filtered (stream, "class ");
 134
 135       if (TYPE_TAG_NAME (type) != NULL)
 136         {
 137           fputs_filtered (TYPE_TAG_NAME (type), stream);
 138           if (show > 0)
 139             fputs_filtered (" ", stream);
 140         }
 141
 142       wrap_here ("    ");
 143
 144       if (show < 0)
 145         {
 146           /* If we just printed a tag name, no need to print anything else.  */
 147           if (TYPE_TAG_NAME (type) == NULL)
 148             fprintf_filtered (stream, "{...}");
 149         }
 150       else if (show > 0 || TYPE_TAG_NAME (type) == NULL)
 151         {
 152           java_type_print_derivation_info (stream, type);
 153
 154           fprintf_filtered (stream, "{\n");
 155           if ((TYPE_NFIELDS (type) == 0) && (TYPE_NFN_FIELDS (type) == 0))
 156             {
 157               if (TYPE_STUB (type))
 158                 fprintfi_filtered (level + 4, stream, "<incomplete type>\n");
 159               else
 160                 fprintfi_filtered (level + 4, stream, "<no data fields>\n");
 161             }
 162
 163           /* If there is a base class for this type,
 164              do not print the field that it occupies.  */
 165
 166           len = TYPE_NFIELDS (type);
 167           for (i = TYPE_N_BASECLASSES (type); i < len; i++)
 168             {
 169               QUIT;
 170               /* Don't print out virtual function table.  */
 171               if (startswith (TYPE_FIELD_NAME (type, i), "_vptr")
 172                   && is_cplus_marker ((TYPE_FIELD_NAME (type, i))[5]))
 173                 continue;
 174
 175               /* Don't print the dummy field "class".  */
 176               if (startswith (TYPE_FIELD_NAME (type, i), "class"))
 177                 continue;
 178
 179               print_spaces_filtered (level + 4, stream);
 180
 181               if (HAVE_CPLUS_STRUCT (type))
 182                 {
 183                   if (TYPE_FIELD_PROTECTED (type, i))
 184                     fprintf_filtered (stream, "protected ");
 185                   else if (TYPE_FIELD_PRIVATE (type, i))
 186                     fprintf_filtered (stream, "private ");
 187                   else
 188                     fprintf_filtered (stream, "public ");
 189                 }
 190
 191               if (field_is_static (&TYPE_FIELD (type, i)))
 192                 fprintf_filtered (stream, "static ");
 193
 194               java_print_type (TYPE_FIELD_TYPE (type, i),
 195                                TYPE_FIELD_NAME (type, i),
 196                                stream, show - 1, level + 4, flags);
 197
 198               fprintf_filtered (stream, ";\n");
 199             }
 200
 201           /* If there are both fields and methods, put a space between.  */
 202           len = TYPE_NFN_FIELDS (type);
 203           if (len)
 204             fprintf_filtered (stream, "\n");
 205
 206           /* Print out the methods.  */
 207
 208           for (i = 0; i < len; i++)
 209             {
 210               struct fn_field *f;
 211               int j;
 212               const char *method_name;
 213               const char *name;
 214               int is_constructor;
 215               int n_overloads;
 216
 217               f = TYPE_FN_FIELDLIST1 (type, i);
 218               n_overloads = TYPE_FN_FIELDLIST_LENGTH (type, i);
 219               method_name = TYPE_FN_FIELDLIST_NAME (type, i);
 220               name = type_name_no_tag (type);
 221               is_constructor = name && strcmp (method_name, name) == 0;
 222
 223               for (j = 0; j < n_overloads; j++)
 224                 {
 225                   const char *real_physname;
 226                   char *physname, *p;
 227                   int is_full_physname_constructor;
 228
 229                   real_physname = TYPE_FN_FIELD_PHYSNAME (f, j);
 230
 231                   /* The physname will contain the return type
 232                      after the final closing parenthesis.  Strip it off.  */
 233                   p = strrchr (real_physname, ')');
 234                   gdb_assert (p != NULL);
 235                   ++p;   /* Keep the trailing ')'.  */
 236                   physname = alloca (p - real_physname + 1);
 237                   memcpy (physname, real_physname, p - real_physname);
 238                   physname[p - real_physname] = '\0';
 239
 240                   is_full_physname_constructor
 241                     = (TYPE_FN_FIELD_CONSTRUCTOR (f, j)
 242                        || is_constructor_name (physname)
 243                        || is_destructor_name (physname));
 244
 245                   QUIT;
 246
 247                   print_spaces_filtered (level + 4, stream);
 248
 249                   if (TYPE_FN_FIELD_PROTECTED (f, j))
 250                     fprintf_filtered (stream, "protected ");
 251                   else if (TYPE_FN_FIELD_PRIVATE (f, j))
 252                     fprintf_filtered (stream, "private ");
 253                   else if (TYPE_FN_FIELD_PUBLIC (f, j))
 254                     fprintf_filtered (stream, "public ");
 255
 256                   if (TYPE_FN_FIELD_ABSTRACT (f, j))
 257                     fprintf_filtered (stream, "abstract ");
 258                   if (TYPE_FN_FIELD_STATIC (f, j))
 259                     fprintf_filtered (stream, "static ");
 260                   if (TYPE_FN_FIELD_FINAL (f, j))
 261                     fprintf_filtered (stream, "final ");
 262                   if (TYPE_FN_FIELD_SYNCHRONIZED (f, j))
 263                     fprintf_filtered (stream, "synchronized ");
 264                   if (TYPE_FN_FIELD_NATIVE (f, j))
 265                     fprintf_filtered (stream, "native ");
 266
 267                   if (TYPE_TARGET_TYPE (TYPE_FN_FIELD_TYPE (f, j)) == 0)
 268                     {
 269                       /* Keep GDB from crashing here.  */
 270                       fprintf_filtered (stream, "<undefined type> %s;\n",
 271                                         TYPE_FN_FIELD_PHYSNAME (f, j));
 272                       break;
 273                     }
 274                   else if (!is_constructor && !is_full_physname_constructor)
 275                     {
 276                       type_print (TYPE_TARGET_TYPE (TYPE_FN_FIELD_TYPE (f, j)),
 277                                   "", stream, -1);
 278                       fputs_filtered (" ", stream);
 279                     }
 280
 281                   if (TYPE_FN_FIELD_STUB (f, j))
 282                     /* Build something we can demangle.  */
 283                     mangled_name = gdb_mangle_name (type, i, j);
 284                   else
 285                     mangled_name = physname;
 286
 287                   demangled_name =
 288                     gdb_demangle (mangled_name,
 289                                   DMGL_ANSI | DMGL_PARAMS | DMGL_JAVA);
 290
 291                   if (demangled_name == NULL)
 292                     demangled_name = xstrdup (mangled_name);
 293
 294                   {
 295                     char *demangled_no_class;
 296                     char *ptr;
 297
 298                     ptr = demangled_no_class = demangled_name;
 299
 300                     while (1)
 301                       {
 302                         char c;
 303
 304                         c = *ptr++;
 305
 306                         if (c == 0 || c == '(')
 307                           break;
 308                         if (c == '.')
 309                           demangled_no_class = ptr;
 310                       }
 311
 312                     fputs_filtered (demangled_no_class, stream);
 313                     xfree (demangled_name);
 314                   }
 315
 316                   if (TYPE_FN_FIELD_STUB (f, j))
 317                     xfree (mangled_name);
 318
 319                   fprintf_filtered (stream, ";\n");
 320                 }
 321             }
 322
 323           fprintfi_filtered (level, stream, "}");
 324         }
 325       break;
 326
 327     default:
 328       c_type_print_base (type, stream, show, level, flags);
 329     }
 330 }
 331
 332 /* LEVEL is the depth to indent lines by.  */
 333
 334 void
 335 java_print_type (struct type *type, const char *varstring,
 336                  struct ui_file *stream, int show, int level,
 337                  const struct type_print_options *flags)
 338 {
 339   int demangled_args;
 340
 341   java_type_print_base (type, stream, show, level, flags);
 342
 343   if (varstring != NULL && *varstring != '\0')
 344     {
 345       fputs_filtered (" ", stream);
 346       fputs_filtered (varstring, stream);
 347     }
 348
 349   /* For demangled function names, we have the arglist as part of the name,
 350      so don't print an additional pair of ()'s.  */
 351
 352   demangled_args = varstring != NULL && strchr (varstring, '(') != NULL;
 353   c_type_print_varspec_suffix (type, stream, show, 0, demangled_args, flags);
 354 }