nsz Git - cparser/blob - mangle.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2008 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_BOOL:        return 'b';
  44         case ATOMIC_TYPE_CHAR:        return 'c';
  45         case ATOMIC_TYPE_SCHAR:       return 'a';
  46         case ATOMIC_TYPE_UCHAR:       return 'h';
  47         case ATOMIC_TYPE_INT:         return 'i';
  48         case ATOMIC_TYPE_UINT:        return 'j';
  49         case ATOMIC_TYPE_SHORT:       return 's';
  50         case ATOMIC_TYPE_USHORT:      return 't';
  51         case ATOMIC_TYPE_LONG:        return 'l';
  52         case ATOMIC_TYPE_ULONG:       return 'm';
  53         case ATOMIC_TYPE_LONGLONG:    return 'x';
  54         case ATOMIC_TYPE_ULONGLONG:   return 'y';
  55         case ATOMIC_TYPE_LONG_DOUBLE: return 'e';
  56         case ATOMIC_TYPE_FLOAT:       return 'f';
  57         case ATOMIC_TYPE_DOUBLE:      return 'd';
  58         }
  59         panic("invalid atomic type in mangler");
  60 }
  61
  62 static void mangle_atomic_type(const atomic_type_t *type)
  63 {
  64         obstack_1grow(&obst, get_atomic_type_mangle(type->akind));
  65 }
  66
  67 static void mangle_pointer_type(const pointer_type_t *type)
  68 {
  69         obstack_1grow(&obst, 'P');
  70         mangle_type(type->points_to);
  71 }
  72
  73 static void mangle_parameters(const function_type_t *type)
  74 {
  75         if (type->unspecified_parameters)
  76                 panic("can't mangle unspecified parameter types");
  77         if (type->kr_style_parameters)
  78                 panic("can't mangle kr_style_parameters type");
  79
  80         const function_parameter_t *parameter = type->parameters;
  81         if (parameter != NULL) {
  82                 for ( ; parameter != NULL; parameter = parameter->next) {
  83                         mangle_type(parameter->type);
  84                 }
  85                 if (type->variadic) {
  86                         obstack_1grow(&obst, 'z');
  87                 }
  88         } else {
  89                 obstack_1grow(&obst, 'v');
  90         }
  91 }
  92
  93 static void mangle_function_type(const function_type_t *type)
  94 {
  95         obstack_1grow(&obst, 'F');
  96         if (type->linkage == LINKAGE_C) {
  97                 obstack_1grow(&obst, 'Y');
  98         }
  99
 100         mangle_type(type->return_type);
 101         mangle_parameters(type);
 102
 103         obstack_1grow(&obst, 'E');
 104 }
 105
 106 static void mangle_class_enum_type(const entity_base_t *ent)
 107 {
 108         const symbol_t *sym = ent->symbol;
 109         if (sym != NULL) {
 110                 const char *name = sym->string;
 111                 obstack_printf(&obst, SIZET_FMT "%s", strlen(name), name);
 112         } else {
 113                 /* TODO need the first typedef name here */
 114                 panic("mangling of unnamed class/enum types not implemented yet");
 115         }
 116 }
 117
 118 static void mangle_array_type(const array_type_t *type)
 119 {
 120         if (type->is_vla) {
 121                 obstack_1grow(&obst, 'A');
 122                 obstack_1grow(&obst, '_');
 123         } else if (type->size_constant) {
 124                 obstack_printf(&obst, "A" SIZET_FMT "_", type->size);
 125         } else {
 126                 panic("mangling of non-constant sized array types not implemented yet");
 127         }
 128         mangle_type(type->element_type);
 129 }
 130
 131 static void mangle_complex_type(const complex_type_t *type)
 132 {
 133         obstack_1grow(&obst, 'C');
 134         obstack_1grow(&obst, get_atomic_type_mangle(type->akind));
 135 }
 136
 137 static void mangle_imaginary_type(const imaginary_type_t *type)
 138 {
 139         obstack_1grow(&obst, 'G');
 140         obstack_1grow(&obst, get_atomic_type_mangle(type->akind));
 141 }
 142
 143 static void mangle_qualifiers(type_qualifiers_t qualifiers)
 144 {
 145         if (qualifiers & TYPE_QUALIFIER_RESTRICT)
 146                 obstack_1grow(&obst, 'r');
 147         if (qualifiers & TYPE_QUALIFIER_VOLATILE)
 148                 obstack_1grow(&obst, 'V');
 149         if (qualifiers & TYPE_QUALIFIER_CONST)
 150                 obstack_1grow(&obst, 'K');
 151
 152         /* handle MS extended qualifiers? */
 153 }
 154
 155 static void mangle_type(type_t *orig_type)
 156 {
 157         type_t *type = skip_typeref(orig_type);
 158
 159         mangle_qualifiers(type->base.qualifiers);
 160
 161         switch (type->kind) {
 162         case TYPE_ATOMIC:
 163                 mangle_atomic_type(&type->atomic);
 164                 return;
 165         case TYPE_POINTER:
 166                 mangle_pointer_type(&type->pointer);
 167                 return;
 168         case TYPE_FUNCTION:
 169                 mangle_function_type(&type->function);
 170                 return;
 171         case TYPE_COMPOUND_STRUCT:
 172         case TYPE_COMPOUND_UNION:
 173                 mangle_class_enum_type(&type->compound.compound->base);
 174                 return;
 175         case TYPE_ENUM:
 176                 mangle_class_enum_type(&type->enumt.enume->base);
 177                 return;
 178         case TYPE_ARRAY:
 179                 mangle_array_type(&type->array);
 180                 return;
 181         case TYPE_COMPLEX:
 182                 mangle_complex_type(&type->complex);
 183                 return;
 184         case TYPE_IMAGINARY:
 185                 mangle_imaginary_type(&type->imaginary);
 186                 return;
 187         case TYPE_INVALID:
 188                 panic("invalid type encountered while mangling");
 189         case TYPE_ERROR:
 190                 panic("error type encountered while mangling");
 191         case TYPE_BUILTIN:
 192         case TYPE_TYPEDEF:
 193         case TYPE_TYPEOF:
 194                 panic("typeref not resolved while manging?!?");
 195
 196         case TYPE_BITFIELD:
 197                 panic("no mangling for this type implemented yet");
 198                 break;
 199         }
 200         panic("invalid type encountered while mangling");
 201 }
 202
 203 static void mangle_entity(entity_t *entity)
 204 {
 205         obstack_1grow(&obst, '_');
 206         obstack_1grow(&obst, 'Z');
 207
 208         /* TODO: mangle scope */
 209
 210         const char *name = entity->base.symbol->string;
 211         obstack_printf(&obst, SIZET_FMT "%s", strlen(name), name);
 212
 213         if (entity->kind == ENTITY_FUNCTION) {
 214                 mangle_parameters(&entity->declaration.type->function);
 215         }
 216 }
 217
 218 static ident *make_id_from_obst(void)
 219 {
 220         size_t  size = obstack_object_size(&obst);
 221         char   *str  = obstack_finish(&obst);
 222         ident  *id   = new_id_from_chars(str, size);
 223         obstack_free(&obst, str);
 224         return id;
 225 }
 226
 227 /**
 228  * Mangles an entity linker (ld) name for win32 usage.
 229  *
 230  * @param ent          the entity to be mangled
 231  * @param declaration  the declaration
 232  */
 233 ident *create_name_win32(entity_t *entity)
 234 {
 235         struct obstack *o = &obst;
 236
 237         assert(is_declaration(entity));
 238
 239         if (entity->declaration.modifiers & DM_DLLIMPORT) {
 240                 /* add prefix for imported symbols */
 241                 obstack_printf(o, "__imp_");
 242         }
 243
 244         if (entity->kind == ENTITY_FUNCTION) {
 245                 cc_kind_t cc = entity->declaration.type->function.calling_convention;
 246
 247                 /* calling convention prefix */
 248                 switch (cc) {
 249                         case CC_DEFAULT:
 250                         case CC_CDECL:
 251                         case CC_STDCALL:  obstack_1grow(o, '_'); break;
 252                         case CC_FASTCALL: obstack_1grow(o, '@'); break;
 253                         default:          panic("unhandled calling convention");
 254                 }
 255
 256                 switch (entity->declaration.type->function.linkage) {
 257                         case LINKAGE_INVALID:
 258                                 break;
 259
 260                         case LINKAGE_C:
 261                                 obstack_printf(o, "%s", entity->base.symbol->string);
 262                                 break;
 263
 264                         case LINKAGE_CXX:
 265                                 mangle_entity(entity);
 266                                 break;
 267                 }
 268
 269                 /* calling convention suffix */
 270                 switch (cc) {
 271                         case CC_DEFAULT:
 272                         case CC_CDECL:
 273                                 break;
 274
 275                         case CC_STDCALL:
 276                         case CC_FASTCALL: {
 277                                 ir_type  *irtype = get_ir_type(entity->declaration.type);
 278                                 unsigned size    = 0;
 279                                 for (int i = get_method_n_params(irtype) - 1; i >= 0; --i) {
 280                                         size += get_type_size_bytes(get_method_param_type(irtype, i));
 281                                 }
 282                                 obstack_printf(o, "@%u", size);
 283                                 break;
 284                         }
 285
 286                         default:
 287                                 panic("unhandled calling convention");
 288                 }
 289         } else {
 290                 obstack_printf(o, "_%s", entity->base.symbol->string);
 291         }
 292
 293         return make_id_from_obst();
 294 }
 295
 296 /**
 297  * Mangles an entity linker (ld) name for Linux ELF usage.
 298  *
 299  * @param ent          the entity to be mangled
 300  * @param declaration  the declaration
 301  */
 302 ident *create_name_linux_elf(entity_t *entity)
 303 {
 304         bool needs_mangling = false;
 305
 306         if (entity->kind == ENTITY_FUNCTION) {
 307                 switch (entity->declaration.type->function.linkage) {
 308                         case LINKAGE_INVALID: break;
 309                         case LINKAGE_C:       break;
 310                         case LINKAGE_CXX:     needs_mangling = true; break;
 311                 }
 312         }
 313
 314         if (needs_mangling) {
 315                 mangle_entity(entity);
 316                 return make_id_from_obst();
 317         }
 318
 319         return new_id_from_str(entity->base.symbol->string);
 320 }
 321
 322 /**
 323  * Mangles an entity linker (ld) name for Mach-O usage.
 324  *
 325  * @param ent          the entity to be mangled
 326  * @param declaration  the declaration
 327  */
 328 ident *create_name_macho(entity_t *entity)
 329 {
 330         obstack_printf(&obst, "_%s", entity->base.symbol->string);
 331         return make_id_from_obst();
 332 }
 333
 334 void init_mangle(void)
 335 {
 336         obstack_init(&obst);
 337 }
 338
 339 void exit_mangle(void)
 340 {
 341         obstack_free(&obst, NULL);
 342 }