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_compound_type(const compound_type_t *type)
 107 {
 108         const symbol_t *sym = type->compound->base.symbol;
 109         if (sym != NULL) {
 110                 const char *name = sym->string;
 111                 obstack_printf(&obst, "%zu%s", strlen(name), name);
 112         } else {
 113                 /* TODO need the first typedef name here */
 114                 panic("mangling of unnamed compound types not implemented yet");
 115         }
 116 }
 117
 118 static void mangle_qualifiers(type_qualifiers_t qualifiers)
 119 {
 120         if (qualifiers & TYPE_QUALIFIER_RESTRICT)
 121                 obstack_1grow(&obst, 'r');
 122         if (qualifiers & TYPE_QUALIFIER_VOLATILE)
 123                 obstack_1grow(&obst, 'V');
 124         if (qualifiers & TYPE_QUALIFIER_CONST)
 125                 obstack_1grow(&obst, 'K');
 126
 127         /* handle MS extended qualifiers? */
 128 }
 129
 130 static void mangle_type(type_t *orig_type)
 131 {
 132         type_t *type = skip_typeref(orig_type);
 133
 134         mangle_qualifiers(type->base.qualifiers);
 135
 136         switch (type->kind) {
 137         case TYPE_ATOMIC:
 138                 mangle_atomic_type(&type->atomic);
 139                 return;
 140         case TYPE_POINTER:
 141                 mangle_pointer_type(&type->pointer);
 142                 return;
 143         case TYPE_FUNCTION:
 144                 mangle_function_type(&type->function);
 145                 return;
 146         case TYPE_COMPOUND_STRUCT:
 147         case TYPE_COMPOUND_UNION:
 148                 mangle_compound_type(&type->compound);
 149                 return;
 150         case TYPE_INVALID:
 151                 panic("invalid type encountered while mangling");
 152         case TYPE_ERROR:
 153                 panic("error type encountered while mangling");
 154         case TYPE_BUILTIN:
 155         case TYPE_TYPEDEF:
 156         case TYPE_TYPEOF:
 157                 panic("typeref not resolved while manging?!?");
 158
 159         case TYPE_BITFIELD:
 160         case TYPE_COMPLEX:
 161         case TYPE_IMAGINARY:
 162         case TYPE_ENUM:
 163         case TYPE_ARRAY:
 164                 panic("no mangling for this type implemented yet");
 165                 break;
 166         }
 167         panic("invalid type encountered while mangling");
 168 }
 169
 170 static void mangle_entity(entity_t *entity)
 171 {
 172         obstack_1grow(&obst, '_');
 173         obstack_1grow(&obst, 'Z');
 174
 175         /* TODO: mangle scope */
 176
 177         const char *name = entity->base.symbol->string;
 178         obstack_printf(&obst, "%zu%s", strlen(name), name);
 179
 180         if (entity->kind == ENTITY_FUNCTION) {
 181                 mangle_parameters(&entity->declaration.type->function);
 182         }
 183 }
 184
 185 static ident *make_id_from_obst(void)
 186 {
 187         size_t  size = obstack_object_size(&obst);
 188         char   *str  = obstack_finish(&obst);
 189         ident  *id   = new_id_from_chars(str, size);
 190         obstack_free(&obst, str);
 191         return id;
 192 }
 193
 194 /**
 195  * Mangles an entity linker (ld) name for win32 usage.
 196  *
 197  * @param ent          the entity to be mangled
 198  * @param declaration  the declaration
 199  */
 200 ident *create_name_win32(entity_t *entity)
 201 {
 202         struct obstack *o = &obst;
 203
 204         assert(is_declaration(entity));
 205
 206         if (entity->declaration.modifiers & DM_DLLIMPORT) {
 207                 /* add prefix for imported symbols */
 208                 obstack_printf(o, "__imp_");
 209         }
 210
 211         if (entity->kind == ENTITY_FUNCTION) {
 212                 cc_kind_t cc = entity->declaration.type->function.calling_convention;
 213
 214                 /* calling convention prefix */
 215                 switch (cc) {
 216                         case CC_DEFAULT:
 217                         case CC_CDECL:
 218                         case CC_STDCALL:  obstack_1grow(o, '_'); break;
 219                         case CC_FASTCALL: obstack_1grow(o, '@'); break;
 220                         default:          panic("unhandled calling convention");
 221                 }
 222
 223                 switch (entity->declaration.type->function.linkage) {
 224                         case LINKAGE_INVALID:
 225                                 break;
 226
 227                         case LINKAGE_C:
 228                                 obstack_printf(o, "%s", entity->base.symbol->string);
 229                                 break;
 230
 231                         case LINKAGE_CXX:
 232                                 mangle_entity(entity);
 233                                 break;
 234                 }
 235
 236                 /* calling convention suffix */
 237                 switch (cc) {
 238                         case CC_DEFAULT:
 239                         case CC_CDECL:
 240                                 break;
 241
 242                         case CC_STDCALL:
 243                         case CC_FASTCALL: {
 244                                 ir_type *irtype = get_ir_type(entity->declaration.type);
 245                                 size_t   size   = 0;
 246                                 for (int i = get_method_n_params(irtype) - 1; i >= 0; --i) {
 247                                         size += get_type_size_bytes(get_method_param_type(irtype, i));
 248                                 }
 249                                 obstack_printf(o, "@%zu", size);
 250                                 break;
 251                         }
 252
 253                         default:
 254                                 panic("unhandled calling convention");
 255                 }
 256         } else {
 257                 obstack_printf(o, "_%s", entity->base.symbol->string);
 258         }
 259
 260         return make_id_from_obst();
 261 }
 262
 263 /**
 264  * Mangles an entity linker (ld) name for Linux ELF usage.
 265  *
 266  * @param ent          the entity to be mangled
 267  * @param declaration  the declaration
 268  */
 269 ident *create_name_linux_elf(entity_t *entity)
 270 {
 271         bool needs_mangling = false;
 272
 273         if (entity->kind == ENTITY_FUNCTION) {
 274                 switch (entity->declaration.type->function.linkage) {
 275                         case LINKAGE_INVALID: break;
 276                         case LINKAGE_C:       break;
 277                         case LINKAGE_CXX:     needs_mangling = true; break;
 278                 }
 279         }
 280
 281         if (needs_mangling) {
 282                 mangle_entity(entity);
 283                 return make_id_from_obst();
 284         }
 285
 286         return new_id_from_str(entity->base.symbol->string);
 287 }
 288
 289 /**
 290  * Mangles an entity linker (ld) name for Mach-O usage.
 291  *
 292  * @param ent          the entity to be mangled
 293  * @param declaration  the declaration
 294  */
 295 ident *create_name_macho(entity_t *entity)
 296 {
 297         obstack_printf(&obst, "_%s", entity->base.symbol->string);
 298         return make_id_from_obst();
 299 }
 300
 301 void init_mangle(void)
 302 {
 303         obstack_init(&obst);
 304 }
 305
 306 void exit_mangle(void)
 307 {
 308         obstack_free(&obst, NULL);
 309 }