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_reference_type(const reference_type_t *type)
  74 {
  75         obstack_1grow(&obst, 'R');
  76         mangle_type(type->refers_to);
  77 }
  78
  79 static void mangle_parameters(const function_type_t *type)
  80 {
  81         if (type->unspecified_parameters)
  82                 panic("can't mangle unspecified parameter types");
  83         if (type->kr_style_parameters)
  84                 panic("can't mangle kr_style_parameters type");
  85
  86         const function_parameter_t *parameter = type->parameters;
  87         if (parameter != NULL) {
  88                 for ( ; parameter != NULL; parameter = parameter->next) {
  89                         mangle_type(parameter->type);
  90                 }
  91                 if (type->variadic) {
  92                         obstack_1grow(&obst, 'z');
  93                 }
  94         } else {
  95                 obstack_1grow(&obst, 'v');
  96         }
  97 }
  98
  99 static void mangle_function_type(const function_type_t *type)
 100 {
 101         obstack_1grow(&obst, 'F');
 102         if (type->linkage == LINKAGE_C) {
 103                 obstack_1grow(&obst, 'Y');
 104         }
 105
 106         mangle_type(type->return_type);
 107         mangle_parameters(type);
 108
 109         obstack_1grow(&obst, 'E');
 110 }
 111
 112 static void print_name(const char* name)
 113 {
 114         obstack_printf(&obst, "%u%s", (unsigned)strlen(name), name);
 115 }
 116
 117 static void mangle_class_type(const compound_type_t *type)
 118 {
 119         const symbol_t *sym = type->compound->base.symbol;
 120         if (sym == NULL) {
 121                 if (type->compound->alias == NULL)
 122                         panic("mangling anonymous type");
 123                 sym = type->compound->alias->base.symbol;
 124         }
 125         print_name(sym->string);
 126 }
 127
 128 static void mangle_enum_type(const enum_type_t *type)
 129 {
 130         const symbol_t *sym = type->enume->base.symbol;
 131         if (sym == NULL) {
 132                 if (type->enume->alias == NULL)
 133                         panic("mangling anonymous type");
 134                 sym = type->enume->alias->base.symbol;
 135         }
 136         print_name(sym->string);
 137 }
 138
 139 static void mangle_array_type(const array_type_t *type)
 140 {
 141         if (type->is_vla) {
 142                 obstack_1grow(&obst, 'A');
 143                 obstack_1grow(&obst, '_');
 144         } else if (type->size_constant) {
 145                 obstack_printf(&obst, "A%u_", (unsigned) type->size);
 146         } else {
 147                 panic("mangling of non-constant sized array types not implemented yet");
 148         }
 149         mangle_type(type->element_type);
 150 }
 151
 152 static void mangle_complex_type(const complex_type_t *type)
 153 {
 154         obstack_1grow(&obst, 'C');
 155         obstack_1grow(&obst, get_atomic_type_mangle(type->akind));
 156 }
 157
 158 static void mangle_imaginary_type(const imaginary_type_t *type)
 159 {
 160         obstack_1grow(&obst, 'G');
 161         obstack_1grow(&obst, get_atomic_type_mangle(type->akind));
 162 }
 163
 164 static void mangle_qualifiers(type_qualifiers_t qualifiers)
 165 {
 166 #if 0 /* Do not mangle restrict qualifiers.  GCC doesn't either */
 167         if (qualifiers & TYPE_QUALIFIER_RESTRICT)
 168                 obstack_1grow(&obst, 'r');
 169 #endif
 170         if (qualifiers & TYPE_QUALIFIER_VOLATILE)
 171                 obstack_1grow(&obst, 'V');
 172         if (qualifiers & TYPE_QUALIFIER_CONST)
 173                 obstack_1grow(&obst, 'K');
 174
 175         /* handle MS extended qualifiers? */
 176 }
 177
 178 static void mangle_type(type_t *orig_type)
 179 {
 180         type_t *type = skip_typeref(orig_type);
 181
 182         mangle_qualifiers(type->base.qualifiers);
 183
 184         switch (type->kind) {
 185         case TYPE_ATOMIC:
 186                 mangle_atomic_type(&type->atomic);
 187                 return;
 188         case TYPE_POINTER:
 189                 mangle_pointer_type(&type->pointer);
 190                 return;
 191         case TYPE_REFERENCE:
 192                 mangle_reference_type(&type->reference);
 193                 return;
 194         case TYPE_FUNCTION:
 195                 mangle_function_type(&type->function);
 196                 return;
 197         case TYPE_COMPOUND_STRUCT:
 198         case TYPE_COMPOUND_UNION:
 199                 mangle_class_type(&type->compound);
 200                 return;
 201         case TYPE_ENUM:
 202                 mangle_enum_type(&type->enumt);
 203                 return;
 204         case TYPE_ARRAY:
 205                 mangle_array_type(&type->array);
 206                 return;
 207         case TYPE_COMPLEX:
 208                 mangle_complex_type(&type->complex);
 209                 return;
 210         case TYPE_IMAGINARY:
 211                 mangle_imaginary_type(&type->imaginary);
 212                 return;
 213         case TYPE_INVALID:
 214                 panic("invalid type encountered while mangling");
 215         case TYPE_ERROR:
 216                 panic("error type encountered while mangling");
 217         case TYPE_BUILTIN:
 218         case TYPE_TYPEDEF:
 219         case TYPE_TYPEOF:
 220                 panic("typeref not resolved while manging?!?");
 221
 222         case TYPE_BITFIELD:
 223                 panic("no mangling for this type implemented yet");
 224                 break;
 225         }
 226         panic("invalid type encountered while mangling");
 227 }
 228
 229 static void mangle_entity(entity_t *entity)
 230 {
 231         obstack_1grow(&obst, '_');
 232         obstack_1grow(&obst, 'Z');
 233
 234         /* TODO: mangle scope */
 235
 236         print_name(entity->base.symbol->string);
 237
 238         if (entity->kind == ENTITY_FUNCTION) {
 239                 mangle_parameters(&entity->declaration.type->function);
 240         }
 241 }
 242
 243 static ident *make_id_from_obst(void)
 244 {
 245         size_t  size = obstack_object_size(&obst);
 246         char   *str  = obstack_finish(&obst);
 247         ident  *id   = new_id_from_chars(str, size);
 248         obstack_free(&obst, str);
 249         return id;
 250 }
 251
 252 /**
 253  * Mangles an entity linker (ld) name for win32 usage.
 254  *
 255  * @param ent          the entity to be mangled
 256  * @param declaration  the declaration
 257  */
 258 ident *create_name_win32(entity_t *entity)
 259 {
 260         struct obstack *o = &obst;
 261
 262         assert(is_declaration(entity));
 263
 264         if (entity->declaration.modifiers & DM_DLLIMPORT) {
 265                 /* add prefix for imported symbols */
 266                 obstack_printf(o, "__imp_");
 267         }
 268
 269         if (entity->kind == ENTITY_FUNCTION) {
 270                 cc_kind_t cc = entity->declaration.type->function.calling_convention;
 271
 272                 /* calling convention prefix */
 273                 switch (cc) {
 274                         case CC_DEFAULT:
 275                         case CC_CDECL:
 276                         case CC_STDCALL:  obstack_1grow(o, '_'); break;
 277                         case CC_FASTCALL: obstack_1grow(o, '@'); break;
 278                         default:          panic("unhandled calling convention");
 279                 }
 280
 281                 switch (entity->declaration.type->function.linkage) {
 282                         case LINKAGE_INVALID:
 283                                 break;
 284
 285                         case LINKAGE_C:
 286                                 obstack_printf(o, "%s", entity->base.symbol->string);
 287                                 break;
 288
 289                         case LINKAGE_CXX:
 290                                 mangle_entity(entity);
 291                                 break;
 292                 }
 293
 294                 /* calling convention suffix */
 295                 switch (cc) {
 296                         case CC_DEFAULT:
 297                         case CC_CDECL:
 298                                 break;
 299
 300                         case CC_STDCALL:
 301                         case CC_FASTCALL: {
 302                                 ir_type  *irtype = get_ir_type(entity->declaration.type);
 303                                 unsigned size    = 0;
 304                                 for (int i = get_method_n_params(irtype) - 1; i >= 0; --i) {
 305                                         size += get_type_size_bytes(get_method_param_type(irtype, i));
 306                                 }
 307                                 obstack_printf(o, "@%u", size);
 308                                 break;
 309                         }
 310
 311                         default:
 312                                 panic("unhandled calling convention");
 313                 }
 314         } else {
 315                 obstack_printf(o, "_%s", entity->base.symbol->string);
 316         }
 317
 318         return make_id_from_obst();
 319 }
 320
 321 /**
 322  * Mangles an entity linker (ld) name for Linux ELF usage.
 323  *
 324  * @param ent          the entity to be mangled
 325  * @param declaration  the declaration
 326  */
 327 ident *create_name_linux_elf(entity_t *entity)
 328 {
 329         bool needs_mangling = false;
 330
 331         if (entity->kind == ENTITY_FUNCTION) {
 332                 switch (entity->declaration.type->function.linkage) {
 333                         case LINKAGE_INVALID: break;
 334                         case LINKAGE_C:       break;
 335                         case LINKAGE_CXX:     needs_mangling = true; break;
 336                 }
 337         }
 338
 339         if (needs_mangling) {
 340                 mangle_entity(entity);
 341                 return make_id_from_obst();
 342         }
 343
 344         return new_id_from_str(entity->base.symbol->string);
 345 }
 346
 347 /**
 348  * Mangles an entity linker (ld) name for Mach-O usage.
 349  *
 350  * @param ent          the entity to be mangled
 351  * @param declaration  the declaration
 352  */
 353 ident *create_name_macho(entity_t *entity)
 354 {
 355         obstack_printf(&obst, "_%s", entity->base.symbol->string);
 356         return make_id_from_obst();
 357 }
 358
 359 void init_mangle(void)
 360 {
 361         obstack_init(&obst);
 362 }
 363
 364 void exit_mangle(void)
 365 {
 366         obstack_free(&obst, NULL);
 367 }