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_function_type(const function_type_t *type)
  74 {
  75         obstack_1grow(&obst, 'F');
  76         if (type->linkage == LINKAGE_C) {
  77                 obstack_1grow(&obst, 'Y');
  78         }
  79
  80         mangle_type(type->return_type);
  81
  82         function_parameter_t *parameter = type->parameters;
  83         for ( ; parameter != NULL; parameter = parameter->next) {
  84                 mangle_type(parameter->type);
  85         }
  86         if (type->variadic) {
  87                 obstack_1grow(&obst, 'z');
  88         }
  89         if (type->unspecified_parameters)
  90                 panic("can't mangle unspecified parameter types");
  91         if (type->kr_style_parameters)
  92                 panic("can't mangle kr_style_parameters type");
  93
  94         obstack_1grow(&obst, 'E');
  95 }
  96
  97 static void mangle_qualifiers(type_qualifiers_t qualifiers)
  98 {
  99         if (qualifiers & TYPE_QUALIFIER_CONST)
 100                 obstack_1grow(&obst, 'K');
 101         if (qualifiers & TYPE_QUALIFIER_VOLATILE)
 102                 obstack_1grow(&obst, 'V');
 103         if (qualifiers & TYPE_QUALIFIER_RESTRICT)
 104                 obstack_1grow(&obst, 'r');
 105
 106         /* handle MS extended qualifiers? */
 107 }
 108
 109 static void mangle_type(type_t *orig_type)
 110 {
 111         type_t *type = skip_typeref(orig_type);
 112
 113         mangle_qualifiers(type->base.qualifiers);
 114
 115         switch (type->kind) {
 116         case TYPE_ATOMIC:
 117                 mangle_atomic_type(&type->atomic);
 118                 return;
 119         case TYPE_POINTER:
 120                 mangle_pointer_type(&type->pointer);
 121                 return;
 122         case TYPE_FUNCTION:
 123                 mangle_function_type(&type->function);
 124                 return;
 125         case TYPE_INVALID:
 126                 panic("invalid type encountered while mangling");
 127         case TYPE_ERROR:
 128                 panic("error type encountered while mangling");
 129         case TYPE_BUILTIN:
 130         case TYPE_TYPEDEF:
 131         case TYPE_TYPEOF:
 132                 panic("typeref not resolved while manging?!?");
 133
 134         case TYPE_BITFIELD:
 135         case TYPE_COMPLEX:
 136         case TYPE_IMAGINARY:
 137         case TYPE_COMPOUND_STRUCT:
 138         case TYPE_COMPOUND_UNION:
 139         case TYPE_ENUM:
 140         case TYPE_ARRAY:
 141                 panic("no mangling for this type implemented yet");
 142                 break;
 143         }
 144         panic("invalid type encountered while mangling");
 145 }
 146
 147 static void mangle_entity(entity_t *entity)
 148 {
 149         obstack_1grow(&obst, '_');
 150         obstack_1grow(&obst, 'Z');
 151
 152         /* TODO: mangle scope */
 153
 154         symbol_t *symbol = entity->base.symbol;
 155         obstack_printf(&obst, "%u%s", strlen(symbol->string), symbol->string);
 156
 157         if (entity->kind == ENTITY_FUNCTION) {
 158                 mangle_type(entity->declaration.type);
 159         }
 160 }
 161
 162 static ident *make_id_from_obst(void)
 163 {
 164         size_t  size = obstack_object_size(&obst);
 165         char   *str  = obstack_finish(&obst);
 166         ident  *id   = new_id_from_chars(str, size);
 167         obstack_free(&obst, str);
 168         return id;
 169 }
 170
 171 /**
 172  * Mangles an entity linker (ld) name for win32 usage.
 173  *
 174  * @param ent          the entity to be mangled
 175  * @param declaration  the declaration
 176  */
 177 ident *create_name_win32(entity_t *entity)
 178 {
 179         struct obstack *o = &obst;
 180
 181         assert(is_declaration(entity));
 182
 183         if (entity->declaration.modifiers & DM_DLLIMPORT) {
 184                 /* add prefix for imported symbols */
 185                 obstack_printf(o, "__imp_");
 186         }
 187
 188         if (entity->kind == ENTITY_FUNCTION) {
 189                 cc_kind_t cc = entity->declaration.type->function.calling_convention;
 190
 191                 /* calling convention prefix */
 192                 switch (cc) {
 193                         case CC_DEFAULT:
 194                         case CC_CDECL:
 195                         case CC_STDCALL:  obstack_1grow(o, '_'); break;
 196                         case CC_FASTCALL: obstack_1grow(o, '@'); break;
 197                         default:          panic("unhandled calling convention");
 198                 }
 199
 200                 switch (entity->declaration.type->function.linkage) {
 201                         case LINKAGE_INVALID:
 202                                 break;
 203
 204                         case LINKAGE_C:
 205                                 obstack_printf(o, "%s", entity->base.symbol->string);
 206                                 break;
 207
 208                         case LINKAGE_CXX:
 209                                 mangle_entity(entity);
 210                                 break;
 211                 }
 212
 213                 /* calling convention suffix */
 214                 switch (cc) {
 215                         case CC_DEFAULT:
 216                         case CC_CDECL:
 217                                 break;
 218
 219                         case CC_STDCALL:
 220                         case CC_FASTCALL: {
 221                                 ir_type *irtype = get_ir_type(entity->declaration.type);
 222                                 size_t   size   = 0;
 223                                 for (int i = get_method_n_params(irtype) - 1; i >= 0; --i) {
 224                                         size += get_type_size_bytes(get_method_param_type(irtype, i));
 225                                 }
 226                                 obstack_printf(o, "@%zu\n", size);
 227                                 break;
 228                         }
 229
 230                         default:
 231                                 panic("unhandled calling convention");
 232                 }
 233         } else {
 234                 obstack_printf(o, "_%s", entity->base.symbol->string);
 235         }
 236
 237         return make_id_from_obst();
 238 }
 239
 240 /**
 241  * Mangles an entity linker (ld) name for Linux ELF usage.
 242  *
 243  * @param ent          the entity to be mangled
 244  * @param declaration  the declaration
 245  */
 246 ident *create_name_linux_elf(entity_t *entity)
 247 {
 248         bool needs_mangling = false;
 249
 250         if (entity->kind == ENTITY_FUNCTION) {
 251                 switch (entity->declaration.type->function.linkage) {
 252                         case LINKAGE_INVALID: break;
 253                         case LINKAGE_C:       break;
 254                         case LINKAGE_CXX:     needs_mangling = true; break;
 255                 }
 256         }
 257
 258         if (needs_mangling) {
 259                 mangle_entity(entity);
 260                 return make_id_from_obst();
 261         }
 262
 263         return new_id_from_str(entity->base.symbol->string);
 264 }
 265
 266 /**
 267  * Mangles an entity linker (ld) name for Mach-O usage.
 268  *
 269  * @param ent          the entity to be mangled
 270  * @param declaration  the declaration
 271  */
 272 ident *create_name_macho(entity_t *entity)
 273 {
 274         obstack_printf(&obst, "_%s", entity->base.symbol->string);
 275         return make_id_from_obst();
 276 }
 277
 278 void init_mangle(void)
 279 {
 280         obstack_init(&obst);
 281 }
 282
 283 void exit_mangle(void)
 284 {
 285         obstack_free(&obst, NULL);
 286 }