nsz Git - cparser/blob - mangle.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <libfirm/firm.h>
  23 #include <string.h>
  24
  25 #include "entity_t.h"
  26 #include "type_t.h"
  27 #include "symbol_t.h"
  28 #include "mangle.h"
  29 #include "diagnostic.h"
  30 #include "ast2firm.h"
  31 #include "lang_features.h"
  32 #include "adt/error.h"
  33
  34 static struct obstack obst;
  35
  36 static void mangle_type(type_t *type);
  37
  38 static char get_atomic_type_mangle(atomic_type_kind_t kind)
  39 {
  40         switch (kind) {
  41         case ATOMIC_TYPE_INVALID: break;
  42         case ATOMIC_TYPE_VOID:        return 'v';
  43         case ATOMIC_TYPE_WCHAR_T:     return 'w';
  44         case ATOMIC_TYPE_BOOL:        return 'b';
  45         case ATOMIC_TYPE_CHAR:        return 'c';
  46         case ATOMIC_TYPE_SCHAR:       return 'a';
  47         case ATOMIC_TYPE_UCHAR:       return 'h';
  48         case ATOMIC_TYPE_INT:         return 'i';
  49         case ATOMIC_TYPE_UINT:        return 'j';
  50         case ATOMIC_TYPE_SHORT:       return 's';
  51         case ATOMIC_TYPE_USHORT:      return 't';
  52         case ATOMIC_TYPE_LONG:        return 'l';
  53         case ATOMIC_TYPE_ULONG:       return 'm';
  54         case ATOMIC_TYPE_LONGLONG:    return 'x';
  55         case ATOMIC_TYPE_ULONGLONG:   return 'y';
  56         case ATOMIC_TYPE_LONG_DOUBLE: return 'e';
  57         case ATOMIC_TYPE_FLOAT:       return 'f';
  58         case ATOMIC_TYPE_DOUBLE:      return 'd';
  59         }
  60         panic("invalid atomic type in mangler");
  61 }
  62
  63 static void mangle_atomic_type(const atomic_type_t *type)
  64 {
  65         obstack_1grow(&obst, get_atomic_type_mangle(type->akind));
  66 }
  67
  68 static void mangle_pointer_type(const pointer_type_t *type)
  69 {
  70         obstack_1grow(&obst, 'P');
  71         mangle_type(type->points_to);
  72 }
  73
  74 static void mangle_reference_type(const reference_type_t *type)
  75 {
  76         obstack_1grow(&obst, 'R');
  77         mangle_type(type->refers_to);
  78 }
  79
  80 static void mangle_parameters(const function_type_t *type)
  81 {
  82         if (type->unspecified_parameters)
  83                 panic("can't mangle unspecified parameter types");
  84         if (type->kr_style_parameters)
  85                 panic("can't mangle kr_style_parameters type");
  86
  87         const function_parameter_t *parameter = type->parameters;
  88         if (parameter != NULL) {
  89                 for ( ; parameter != NULL; parameter = parameter->next) {
  90                         mangle_type(parameter->type);
  91                 }
  92                 if (type->variadic) {
  93                         obstack_1grow(&obst, 'z');
  94                 }
  95         } else {
  96                 obstack_1grow(&obst, 'v');
  97         }
  98 }
  99
 100 static void mangle_function_type(const function_type_t *type)
 101 {
 102         obstack_1grow(&obst, 'F');
 103         if (type->linkage == LINKAGE_C) {
 104                 obstack_1grow(&obst, 'Y');
 105         }
 106
 107         mangle_type(type->return_type);
 108         mangle_parameters(type);
 109
 110         obstack_1grow(&obst, 'E');
 111 }
 112
 113 static void print_name(const char* name)
 114 {
 115         obstack_printf(&obst, "%u%s", (unsigned)strlen(name), name);
 116 }
 117
 118 static void mangle_class_type(const compound_type_t *type)
 119 {
 120         const symbol_t *sym = type->compound->base.symbol;
 121         if (sym == NULL) {
 122                 if (type->compound->alias == NULL)
 123                         panic("mangling anonymous type");
 124                 sym = type->compound->alias->base.symbol;
 125         }
 126         print_name(sym->string);
 127 }
 128
 129 static void mangle_enum_type(const enum_type_t *type)
 130 {
 131         const symbol_t *sym = type->enume->base.symbol;
 132         if (sym == NULL) {
 133                 if (type->enume->alias == NULL)
 134                         panic("mangling anonymous type");
 135                 sym = type->enume->alias->base.symbol;
 136         }
 137         print_name(sym->string);
 138 }
 139
 140 static void mangle_array_type(const array_type_t *type)
 141 {
 142         if (type->is_vla) {
 143                 obstack_1grow(&obst, 'A');
 144                 obstack_1grow(&obst, '_');
 145         } else if (type->size_constant) {
 146                 obstack_printf(&obst, "A%u_", (unsigned) type->size);
 147         } else {
 148                 panic("mangling of non-constant sized array types not implemented yet");
 149         }
 150         mangle_type(type->element_type);
 151 }
 152
 153 static void mangle_complex_type(const complex_type_t *type)
 154 {
 155         obstack_1grow(&obst, 'C');
 156         obstack_1grow(&obst, get_atomic_type_mangle(type->akind));
 157 }
 158
 159 static void mangle_imaginary_type(const imaginary_type_t *type)
 160 {
 161         obstack_1grow(&obst, 'G');
 162         obstack_1grow(&obst, get_atomic_type_mangle(type->akind));
 163 }
 164
 165 static void mangle_qualifiers(type_qualifiers_t qualifiers)
 166 {
 167 #if 0 /* Do not mangle restrict qualifiers.  GCC doesn't either */
 168         if (qualifiers & TYPE_QUALIFIER_RESTRICT)
 169                 obstack_1grow(&obst, 'r');
 170 #endif
 171         if (qualifiers & TYPE_QUALIFIER_VOLATILE)
 172                 obstack_1grow(&obst, 'V');
 173         if (qualifiers & TYPE_QUALIFIER_CONST)
 174                 obstack_1grow(&obst, 'K');
 175
 176         /* handle MS extended qualifiers? */
 177 }
 178
 179 static void mangle_type(type_t *orig_type)
 180 {
 181         type_t *type = skip_typeref(orig_type);
 182
 183         mangle_qualifiers(type->base.qualifiers);
 184
 185         switch (type->kind) {
 186         case TYPE_ATOMIC:
 187                 mangle_atomic_type(&type->atomic);
 188                 return;
 189         case TYPE_POINTER:
 190                 mangle_pointer_type(&type->pointer);
 191                 return;
 192         case TYPE_REFERENCE:
 193                 mangle_reference_type(&type->reference);
 194                 return;
 195         case TYPE_FUNCTION:
 196                 mangle_function_type(&type->function);
 197                 return;
 198         case TYPE_COMPOUND_STRUCT:
 199         case TYPE_COMPOUND_UNION:
 200                 mangle_class_type(&type->compound);
 201                 return;
 202         case TYPE_ENUM:
 203                 mangle_enum_type(&type->enumt);
 204                 return;
 205         case TYPE_ARRAY:
 206                 mangle_array_type(&type->array);
 207                 return;
 208         case TYPE_COMPLEX:
 209                 mangle_complex_type(&type->complex);
 210                 return;
 211         case TYPE_IMAGINARY:
 212                 mangle_imaginary_type(&type->imaginary);
 213                 return;
 214         case TYPE_INVALID:
 215                 panic("invalid type encountered while mangling");
 216         case TYPE_ERROR:
 217                 panic("error type encountered while mangling");
 218         case TYPE_BUILTIN:
 219         case TYPE_TYPEDEF:
 220         case TYPE_TYPEOF:
 221                 panic("typeref not resolved while manging?!?");
 222
 223         case TYPE_BITFIELD:
 224                 panic("no mangling for this type implemented yet");
 225         }
 226         panic("invalid type encountered while mangling");
 227 }
 228
 229 static void mangle_namespace(entity_t *entity)
 230 {
 231         for (entity_t *e = entity->base.parent_entity; e != NULL;
 232              e = e->base.parent_entity) {
 233             /* TODO: we need something similar (or the same?) for classes */
 234                 if (e->kind == ENTITY_NAMESPACE) {
 235                         mangle_namespace(e);
 236                         print_name(e->base.symbol->string);
 237                         return;
 238                 }
 239         }
 240 }
 241
 242 static void mangle_entity(entity_t *entity)
 243 {
 244         obstack_1grow(&obst, '_');
 245         obstack_1grow(&obst, 'Z');
 246
 247         if (entity->base.parent_entity != NULL) {
 248                 obstack_1grow(&obst, 'N');
 249                 mangle_namespace(entity);
 250         }
 251
 252         print_name(entity->base.symbol->string);
 253
 254         if (entity->kind == ENTITY_FUNCTION) {
 255                 mangle_parameters(&entity->declaration.type->function);
 256         }
 257 }
 258
 259 static ident *make_id_from_obst(void)
 260 {
 261         size_t  size = obstack_object_size(&obst);
 262         char   *str  = obstack_finish(&obst);
 263         ident  *id   = new_id_from_chars(str, size);
 264         obstack_free(&obst, str);
 265         return id;
 266 }
 267
 268 /**
 269  * Mangles an entity linker (ld) name for win32 usage.
 270  *
 271  * @param ent          the entity to be mangled
 272  * @param declaration  the declaration
 273  */
 274 ident *create_name_win32(entity_t *entity)
 275 {
 276         struct obstack *o = &obst;
 277
 278         assert(is_declaration(entity));
 279
 280         if (entity->kind == ENTITY_FUNCTION) {
 281                 if (entity->declaration.modifiers & DM_DLLIMPORT)
 282                         /* add prefix for imported symbols */
 283                         obstack_printf(o, "__imp_");
 284
 285                 cc_kind_t cc = entity->declaration.type->function.calling_convention;
 286
 287                 /* calling convention prefix */
 288                 switch (cc) {
 289                         case CC_DEFAULT:
 290                         case CC_CDECL:
 291                         case CC_STDCALL:  obstack_1grow(o, '_'); break;
 292                         case CC_FASTCALL: obstack_1grow(o, '@'); break;
 293                         default:          panic("unhandled calling convention");
 294                 }
 295
 296                 switch (entity->declaration.type->function.linkage) {
 297                         case LINKAGE_INVALID:
 298                                 panic("linkage type of function is invalid");
 299
 300                         case LINKAGE_C:
 301                                 obstack_printf(o, "%s", entity->base.symbol->string);
 302                                 break;
 303
 304                         case LINKAGE_CXX:
 305                                 mangle_entity(entity);
 306                                 break;
 307                 }
 308
 309                 /* calling convention suffix */
 310                 switch (cc) {
 311                         case CC_DEFAULT:
 312                         case CC_CDECL:
 313                                 break;
 314
 315                         case CC_STDCALL:
 316                         case CC_FASTCALL: {
 317                                 ir_type  *irtype = get_ir_type(entity->declaration.type);
 318                                 unsigned size    = 0;
 319                                 for (int i = get_method_n_params(irtype) - 1; i >= 0; --i) {
 320                                         size += get_type_size_bytes(get_method_param_type(irtype, i));
 321                                 }
 322                                 obstack_printf(o, "@%u", size);
 323                                 break;
 324                         }
 325
 326                         default:
 327                                 panic("unhandled calling convention");
 328                 }
 329         } else {
 330                 obstack_printf(o, "_%s", entity->base.symbol->string);
 331         }
 332
 333         return make_id_from_obst();
 334 }
 335
 336 /**
 337  * Mangles an entity linker (ld) name for Linux ELF usage.
 338  *
 339  * @param ent          the entity to be mangled
 340  * @param declaration  the declaration
 341  */
 342 ident *create_name_linux_elf(entity_t *entity)
 343 {
 344         bool needs_mangling = false;
 345
 346         if (entity->kind == ENTITY_FUNCTION) {
 347                 switch (entity->declaration.type->function.linkage) {
 348                         case LINKAGE_INVALID:
 349                                 panic("linkage type of function is invalid");
 350
 351                         case LINKAGE_C:       break;
 352                         case LINKAGE_CXX:     needs_mangling = true; break;
 353                 }
 354         }
 355
 356         if (needs_mangling) {
 357                 mangle_entity(entity);
 358                 return make_id_from_obst();
 359         }
 360
 361         return new_id_from_str(entity->base.symbol->string);
 362 }
 363
 364 /**
 365  * Mangles an entity linker (ld) name for Mach-O usage.
 366  *
 367  * @param ent          the entity to be mangled
 368  * @param declaration  the declaration
 369  */
 370 ident *create_name_macho(entity_t *entity)
 371 {
 372         if (entity->kind == ENTITY_FUNCTION && entity->declaration.type->function.linkage == LINKAGE_INVALID)
 373                 panic("linkage type of function is invalid");
 374
 375         obstack_printf(&obst, "_%s", entity->base.symbol->string);
 376         return make_id_from_obst();
 377 }
 378
 379 void init_mangle(void)
 380 {
 381         obstack_init(&obst);
 382 }
 383
 384 void exit_mangle(void)
 385 {
 386         obstack_free(&obst, NULL);
 387 }