gdbsupport/tdesc.cc

   1 /* Target description support for GDB.
   2
   3    Copyright (C) 2018-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "common-defs.h"
  21 #include "gdbsupport/tdesc.h"
  22
  23 tdesc_reg::tdesc_reg (struct tdesc_feature *feature, const std::string &name_,
  24                       int regnum, int save_restore_, const char *group_,
  25                       int bitsize_, const char *type_)
  26   : name (name_), target_regnum (regnum),
  27     save_restore (save_restore_),
  28     group (group_ != NULL ? group_ : ""),
  29     bitsize (bitsize_),
  30     type (type_ != NULL ? type_ : "<unknown>")
  31 {
  32   /* If the register's type is target-defined, look it up now.  We may not
  33      have easy access to the containing feature when we want it later.  */
  34   tdesc_type = tdesc_named_type (feature, type.c_str ());
  35 }
  36
  37 /* Predefined types.  */
  38 static tdesc_type_builtin tdesc_predefined_types[] =
  39 {
  40   { "bool", TDESC_TYPE_BOOL },
  41   { "int8", TDESC_TYPE_INT8 },
  42   { "int16", TDESC_TYPE_INT16 },
  43   { "int32", TDESC_TYPE_INT32 },
  44   { "int64", TDESC_TYPE_INT64 },
  45   { "int128", TDESC_TYPE_INT128 },
  46   { "uint8", TDESC_TYPE_UINT8 },
  47   { "uint16", TDESC_TYPE_UINT16 },
  48   { "uint32", TDESC_TYPE_UINT32 },
  49   { "uint64", TDESC_TYPE_UINT64 },
  50   { "uint128", TDESC_TYPE_UINT128 },
  51   { "code_ptr", TDESC_TYPE_CODE_PTR },
  52   { "data_ptr", TDESC_TYPE_DATA_PTR },
  53   { "ieee_half", TDESC_TYPE_IEEE_HALF },
  54   { "ieee_single", TDESC_TYPE_IEEE_SINGLE },
  55   { "ieee_double", TDESC_TYPE_IEEE_DOUBLE },
  56   { "arm_fpa_ext", TDESC_TYPE_ARM_FPA_EXT },
  57   { "i387_ext", TDESC_TYPE_I387_EXT }
  58 };
  59
  60 void tdesc_feature::accept (tdesc_element_visitor &v) const
  61 {
  62   v.visit_pre (this);
  63
  64   for (const tdesc_type_up &type : types)
  65     type->accept (v);
  66
  67   for (const tdesc_reg_up &reg : registers)
  68     reg->accept (v);
  69
  70   v.visit_post (this);
  71 }
  72
  73 bool tdesc_feature::operator== (const tdesc_feature &other) const
  74 {
  75   if (name != other.name)
  76     return false;
  77
  78   if (registers.size () != other.registers.size ())
  79     return false;
  80
  81   for (int ix = 0; ix < registers.size (); ix++)
  82     {
  83       const tdesc_reg_up &reg1 = registers[ix];
  84       const tdesc_reg_up &reg2 = other.registers[ix];
  85
  86       if (reg1 != reg2 && *reg1 != *reg2)
  87         return false;
  88       }
  89
  90   if (types.size () != other.types.size ())
  91     return false;
  92
  93   for (int ix = 0; ix < types.size (); ix++)
  94     {
  95       const tdesc_type_up &type1 = types[ix];
  96       const tdesc_type_up &type2 = other.types[ix];
  97
  98       if (type1 != type2 && *type1 != *type2)
  99         return false;
 100     }
 101
 102   return true;
 103 }
 104
 105 /* Lookup a predefined type.  */
 106
 107 static struct tdesc_type *
 108 tdesc_predefined_type (enum tdesc_type_kind kind)
 109 {
 110   for (int ix = 0; ix < ARRAY_SIZE (tdesc_predefined_types); ix++)
 111     if (tdesc_predefined_types[ix].kind == kind)
 112       return &tdesc_predefined_types[ix];
 113
 114   gdb_assert_not_reached ("bad predefined tdesc type");
 115 }
 116
 117 /* See gdbsupport/tdesc.h.  */
 118
 119 struct tdesc_type *
 120 tdesc_named_type (const struct tdesc_feature *feature, const char *id)
 121 {
 122   /* First try target-defined types.  */
 123   for (const tdesc_type_up &type : feature->types)
 124     if (type->name == id)
 125       return type.get ();
 126
 127   /* Next try the predefined types.  */
 128   for (int ix = 0; ix < ARRAY_SIZE (tdesc_predefined_types); ix++)
 129     if (tdesc_predefined_types[ix].name == id)
 130       return &tdesc_predefined_types[ix];
 131
 132   return NULL;
 133 }
 134
 135 /* See gdbsupport/tdesc.h.  */
 136
 137 void
 138 tdesc_create_reg (struct tdesc_feature *feature, const char *name,
 139                   int regnum, int save_restore, const char *group,
 140                   int bitsize, const char *type)
 141 {
 142   tdesc_reg *reg = new tdesc_reg (feature, name, regnum, save_restore,
 143                                   group, bitsize, type);
 144
 145   feature->registers.emplace_back (reg);
 146 }
 147
 148 /* See gdbsupport/tdesc.h.  */
 149
 150 struct tdesc_type *
 151 tdesc_create_vector (struct tdesc_feature *feature, const char *name,
 152                      struct tdesc_type *field_type, int count)
 153 {
 154   tdesc_type_vector *type = new tdesc_type_vector (name, field_type, count);
 155   feature->types.emplace_back (type);
 156
 157   return type;
 158 }
 159
 160 /* See gdbsupport/tdesc.h.  */
 161
 162 tdesc_type_with_fields *
 163 tdesc_create_struct (struct tdesc_feature *feature, const char *name)
 164 {
 165   tdesc_type_with_fields *type
 166     = new tdesc_type_with_fields (name, TDESC_TYPE_STRUCT);
 167   feature->types.emplace_back (type);
 168
 169   return type;
 170 }
 171
 172 /* See gdbsupport/tdesc.h.  */
 173
 174 void
 175 tdesc_set_struct_size (tdesc_type_with_fields *type, int size)
 176 {
 177   gdb_assert (type->kind == TDESC_TYPE_STRUCT);
 178   gdb_assert (size > 0);
 179   type->size = size;
 180 }
 181
 182 /* See gdbsupport/tdesc.h.  */
 183
 184 tdesc_type_with_fields *
 185 tdesc_create_union (struct tdesc_feature *feature, const char *name)
 186 {
 187   tdesc_type_with_fields *type
 188     = new tdesc_type_with_fields (name, TDESC_TYPE_UNION);
 189   feature->types.emplace_back (type);
 190
 191   return type;
 192 }
 193
 194 /* See gdbsupport/tdesc.h.  */
 195
 196 tdesc_type_with_fields *
 197 tdesc_create_flags (struct tdesc_feature *feature, const char *name,
 198                     int size)
 199 {
 200   gdb_assert (size > 0);
 201
 202   tdesc_type_with_fields *type
 203     = new tdesc_type_with_fields (name, TDESC_TYPE_FLAGS, size);
 204   feature->types.emplace_back (type);
 205
 206   return type;
 207 }
 208
 209 /* See gdbsupport/tdesc.h.  */
 210
 211 tdesc_type_with_fields *
 212 tdesc_create_enum (struct tdesc_feature *feature, const char *name,
 213                    int size)
 214 {
 215   gdb_assert (size > 0);
 216
 217   tdesc_type_with_fields *type
 218     = new tdesc_type_with_fields (name, TDESC_TYPE_ENUM, size);
 219   feature->types.emplace_back (type);
 220
 221   return type;
 222 }
 223
 224 /* See gdbsupport/tdesc.h.  */
 225
 226 void
 227 tdesc_add_field (tdesc_type_with_fields *type, const char *field_name,
 228                  struct tdesc_type *field_type)
 229 {
 230   gdb_assert (type->kind == TDESC_TYPE_UNION
 231               || type->kind == TDESC_TYPE_STRUCT);
 232
 233   /* Initialize start and end so we know this is not a bit-field
 234      when we print-c-tdesc.  */
 235   type->fields.emplace_back (field_name, field_type, -1, -1);
 236 }
 237
 238 /* See gdbsupport/tdesc.h.  */
 239
 240 void
 241 tdesc_add_typed_bitfield (tdesc_type_with_fields *type, const char *field_name,
 242                           int start, int end, struct tdesc_type *field_type)
 243 {
 244   gdb_assert (type->kind == TDESC_TYPE_STRUCT
 245               || type->kind == TDESC_TYPE_FLAGS);
 246   gdb_assert (start >= 0 && end >= start);
 247
 248   type->fields.emplace_back (field_name, field_type, start, end);
 249 }
 250
 251 /* See gdbsupport/tdesc.h.  */
 252
 253 void
 254 tdesc_add_bitfield (tdesc_type_with_fields *type, const char *field_name,
 255                     int start, int end)
 256 {
 257   struct tdesc_type *field_type;
 258
 259   gdb_assert (start >= 0 && end >= start);
 260
 261   if (type->size > 4)
 262     field_type = tdesc_predefined_type (TDESC_TYPE_UINT64);
 263   else
 264     field_type = tdesc_predefined_type (TDESC_TYPE_UINT32);
 265
 266   tdesc_add_typed_bitfield (type, field_name, start, end, field_type);
 267 }
 268
 269 /* See gdbsupport/tdesc.h.  */
 270
 271 void
 272 tdesc_add_flag (tdesc_type_with_fields *type, int start,
 273                 const char *flag_name)
 274 {
 275   gdb_assert (type->kind == TDESC_TYPE_FLAGS
 276               || type->kind == TDESC_TYPE_STRUCT);
 277
 278   type->fields.emplace_back (flag_name,
 279                              tdesc_predefined_type (TDESC_TYPE_BOOL),
 280                              start, start);
 281 }
 282
 283 /* See gdbsupport/tdesc.h.  */
 284
 285 void
 286 tdesc_add_enum_value (tdesc_type_with_fields *type, int value,
 287                       const char *name)
 288 {
 289   gdb_assert (type->kind == TDESC_TYPE_ENUM);
 290   type->fields.emplace_back (name,
 291                              tdesc_predefined_type (TDESC_TYPE_INT32),
 292                              value, -1);
 293 }
 294
 295 void print_xml_feature::visit_pre (const tdesc_feature *e)
 296 {
 297   string_appendf (*m_buffer, "<feature name=\"%s\">\n", e->name.c_str ());
 298 }
 299
 300 void print_xml_feature::visit_post (const tdesc_feature *e)
 301 {
 302   string_appendf (*m_buffer, "</feature>\n");
 303 }
 304
 305 void print_xml_feature::visit (const tdesc_type_builtin *t)
 306 {
 307   error (_("xml output is not supported for type \"%s\"."), t->name.c_str ());
 308 }
 309
 310 void print_xml_feature::visit (const tdesc_type_vector *t)
 311 {
 312   string_appendf (*m_buffer, "<vector id=\"%s\" type=\"%s\" count=\"%d\"/>\n",
 313                   t->name.c_str (), t->element_type->name.c_str (), t->count);
 314 }
 315
 316 void print_xml_feature::visit (const tdesc_type_with_fields *t)
 317 {
 318   const static char *types[] = { "struct", "union", "flags", "enum" };
 319
 320   gdb_assert (t->kind >= TDESC_TYPE_STRUCT && t->kind <= TDESC_TYPE_ENUM);
 321
 322   string_appendf (*m_buffer,
 323                   "<%s id=\"%s\"", types[t->kind - TDESC_TYPE_STRUCT],
 324                   t->name.c_str ());
 325
 326   switch (t->kind)
 327     {
 328     case TDESC_TYPE_STRUCT:
 329     case TDESC_TYPE_FLAGS:
 330       if (t->size > 0)
 331         string_appendf (*m_buffer, " size=\"%d\"", t->size);
 332       string_appendf (*m_buffer, ">\n");
 333
 334       for (const tdesc_type_field &f : t->fields)
 335         {
 336           string_appendf (*m_buffer, "  <field name=\"%s\" ", f.name.c_str ());
 337           if (f.start == -1)
 338             string_appendf (*m_buffer, "type=\"%s\"/>\n",
 339                             f.type->name.c_str ());
 340           else
 341             string_appendf (*m_buffer, "start=\"%d\" end=\"%d\"/>\n", f.start,
 342                             f.end);
 343         }
 344       break;
 345
 346     case TDESC_TYPE_ENUM:
 347       string_appendf (*m_buffer, ">\n");
 348       for (const tdesc_type_field &f : t->fields)
 349         string_appendf (*m_buffer, "  <field name=\"%s\" start=\"%d\"/>\n",
 350                         f.name.c_str (), f.start);
 351       break;
 352
 353     case TDESC_TYPE_UNION:
 354       string_appendf (*m_buffer, ">\n");
 355       for (const tdesc_type_field &f : t->fields)
 356         string_appendf (*m_buffer, "  <field name=\"%s\" type=\"%s\"/>\n",
 357                         f.name.c_str (), f.type->name.c_str ());
 358       break;
 359
 360     default:
 361       error (_("xml output is not supported for type \"%s\"."),
 362              t->name.c_str ());
 363     }
 364
 365   string_appendf (*m_buffer, "</%s>\n", types[t->kind - TDESC_TYPE_STRUCT]);
 366 }
 367
 368 void print_xml_feature::visit (const tdesc_reg *r)
 369 {
 370   string_appendf (*m_buffer,
 371                   "<reg name=\"%s\" bitsize=\"%d\" type=\"%s\" regnum=\"%ld\"",
 372                   r->name.c_str (), r->bitsize, r->type.c_str (),
 373                   r->target_regnum);
 374
 375   if (r->group.length () > 0)
 376     string_appendf (*m_buffer, " group=\"%s\"", r->group.c_str ());
 377
 378   if (r->save_restore == 0)
 379     string_appendf (*m_buffer, " save-restore=\"no\"");
 380
 381   string_appendf (*m_buffer, "/>\n");
 382 }
 383
 384 void print_xml_feature::visit_pre (const target_desc *e)
 385 {
 386 #ifndef IN_PROCESS_AGENT
 387   string_appendf (*m_buffer, "<?xml version=\"1.0\"?>\n");
 388   string_appendf (*m_buffer, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n");
 389   string_appendf (*m_buffer, "<target>\n<architecture>%s</architecture>\n",
 390                   tdesc_architecture_name (e));
 391
 392   const char *osabi = tdesc_osabi_name (e);
 393   if (osabi != nullptr)
 394     string_appendf (*m_buffer, "<osabi>%s</osabi>", osabi);
 395 #endif
 396 }
 397
 398 void print_xml_feature::visit_post (const target_desc *e)
 399 {
 400   string_appendf (*m_buffer, "</target>\n");
 401 }