sig/parse.cpp

   1 /* Cycript - The Truly Universal Scripting Language
   2  * Copyright (C) 2009-2016  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Affero General Public License, Version 3 {{{ */
   6 /*
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include "sig/parse.hpp"
  23 #include "Error.hpp"
  24
  25 #include <cstdio>
  26 #include <cstdlib>
  27 #include <cstring>
  28 #include <sstream>
  29
  30 namespace sig {
  31
  32 void Parse_(CYPool &pool, struct Signature *signature, const char **name, char eos, Callback callback);
  33 struct Type *Parse_(CYPool &pool, const char **name, char eos, bool named, Callback callback);
  34
  35
  36 /* XXX: I really screwed up this time */
  37 void *prealloc_(CYPool &pool, void *odata, size_t osize, size_t nsize) {
  38     void *ndata(pool.malloc<void>(nsize));
  39     memcpy(ndata, odata, osize);
  40     return ndata;
  41 }
  42
  43 void Parse_(CYPool &pool, struct Signature *signature, const char **name, char eos, Callback callback) {
  44     _assert(*name != NULL);
  45
  46     // XXX: this is just a stupid check :(
  47     bool named(**name == '"');
  48
  49     signature->elements = NULL;
  50     signature->count = 0;
  51
  52     for (;;) {
  53         if (**name == eos) {
  54             ++*name;
  55             return;
  56         }
  57
  58         signature->elements = (struct Element *) prealloc_(pool, signature->elements, signature->count * sizeof(struct Element), (signature->count + 1) * sizeof(struct Element));
  59         _assert(signature->elements != NULL);
  60
  61         struct Element *element = &signature->elements[signature->count++];
  62
  63         if (**name != '"')
  64             element->name = NULL;
  65         else {
  66             const char *quote = strchr(++*name, '"');
  67             element->name = pool.strmemdup(*name, quote - *name);
  68             *name = quote + 1;
  69         }
  70
  71         element->type = Parse_(pool, name, eos, named, callback);
  72
  73         if (**name < '0' || **name > '9')
  74             element->offset = _not(size_t);
  75         else {
  76             element->offset = 0;
  77
  78             do
  79                 element->offset = element->offset * 10 + (*(*name)++ - '0');
  80             while (**name >= '0' && **name <= '9');
  81         }
  82     }
  83 }
  84
  85 Type *Parse_(CYPool &pool, const char **encoding, char eos, bool named, Callback callback) {
  86     char next = *(*encoding)++;
  87
  88     Type *type;
  89     uint8_t flags(0);
  90
  91   parse:
  92     switch (next) {
  93         case '?': type = new(pool) Unknown(); break;
  94
  95 #ifdef CY_OBJECTIVEC
  96         case '#': type = new(pool) Meta(); break;
  97 #endif
  98
  99         case '(':
 100             type = new(pool) Aggregate(true);
 101             next = ')';
 102         goto aggregate;
 103
 104         case '*': type = new(pool) String(); break;
 105
 106 #ifdef CY_OBJECTIVEC
 107         case ':': type = new(pool) Selector(); break;
 108
 109         case '@': {
 110             char next(**encoding);
 111
 112             if (next == '?') {
 113                 type = new(pool) Block();
 114                 ++*encoding;
 115             } else {
 116                 const char *name;
 117                 if (next != '"')
 118                     name = NULL;
 119                 else {
 120                     const char *quote = strchr(*encoding + 1, '"');
 121                     if (quote == NULL)
 122                         CYThrow("unterminated specific id type {%s}", *encoding - 10);
 123                     else if (!named || quote[1] == eos || quote[1] == '"') {
 124                         name = pool.strmemdup(*encoding + 1, quote - *encoding - 1);
 125                         *encoding = quote + 1;
 126                     } else {
 127                         name = NULL;
 128                     }
 129                 }
 130
 131                 type = new(pool) Object(name);
 132             }
 133
 134         } break;
 135 #endif
 136
 137         case 'B': type = new(pool) Primitive<bool>(); break;
 138         case 'C': type = new(pool) Primitive<unsigned char>(); break;
 139         case 'I': type = new(pool) Primitive<unsigned int>(); break;
 140         case 'L': type = new(pool) Primitive<unsigned long>(); break;
 141         case 'Q': type = new(pool) Primitive<unsigned long long>(); break;
 142         case 'S': type = new(pool) Primitive<unsigned short>(); break;
 143
 144         case '[': {
 145             size_t size(strtoul(*encoding, (char **) encoding, 10));
 146             type = new(pool) Array(*Parse_(pool, encoding, eos, false, callback), size);
 147             if (**encoding != ']')
 148                 CYThrow("']' != \"%s\"", *encoding);
 149             ++*encoding;
 150         } break;
 151
 152         case '^':
 153             if (**encoding == '"')
 154                 _assert(false); // XXX: why is this here?!?
 155             else {
 156                 type = Parse_(pool, encoding, eos, named, callback);
 157 #ifdef CY_OBJECTIVEC
 158                 Aggregate *aggregate(dynamic_cast<Aggregate *>(type));
 159                 if (aggregate != NULL && strcmp(aggregate->name, "_objc_class") == 0)
 160                     type = new(pool) Meta();
 161                 else
 162 #endif
 163                     type = new(pool) Pointer(*type);
 164             }
 165         break;
 166
 167         case 'b':
 168             type = new(pool) Bits(strtoul(*encoding, (char **) encoding, 10));
 169         break;
 170
 171         case 'c': type = new(pool) Primitive<signed char>(); break;
 172         case 'd': type = new(pool) Primitive<double>(); break;
 173         case 'f': type = new(pool) Primitive<float>(); break;
 174         case 'i': type = new(pool) Primitive<signed int>(); break;
 175         case 'l': type = new(pool) Primitive<signed long>(); break;
 176         case 'q': type = new(pool) Primitive<signed long long>(); break;
 177         case 's': type = new(pool) Primitive<short>(); break;
 178         case 'v': type = new(pool) Void(); break;
 179
 180 #ifdef __SIZEOF_INT128__
 181         case 't': type = new(pool) Primitive<signed __int128>(); break;
 182         case 'T': type = new(pool) Primitive<unsigned __int128>(); break;
 183 #endif
 184
 185         case '{':
 186             type = new(pool) Aggregate(false);
 187             next = '}';
 188         goto aggregate;
 189
 190         aggregate: {
 191             Aggregate *aggregate(static_cast<Aggregate *>(type));
 192
 193             char end = next;
 194             const char *begin = *encoding;
 195             do switch (next = *(*encoding)++) {
 196                 case '\0':
 197                     _assert(false);
 198                 case '}':
 199                     // XXX: this is actually a type reference
 200                     aggregate->signature.count = _not(size_t);
 201                     next = '='; // this is a "break". I'm sorry
 202             } while (next != '=');
 203
 204             size_t length = *encoding - begin - 1;
 205             if (strncmp(begin, "?", length) != 0)
 206                 aggregate->name = (char *) pool.strmemdup(begin, length);
 207
 208             if (aggregate->signature.count == _not(size_t))
 209                 aggregate->signature.elements = NULL;
 210             else
 211                 Parse_(pool, &aggregate->signature, encoding, end, callback);
 212
 213             // XXX: this is a hack to support trivial unions
 214             if (aggregate->signature.count <= 1)
 215                 aggregate->overlap = false;
 216
 217             if (callback != NULL)
 218                 type = (*callback)(pool, aggregate);
 219         } break;
 220
 221         case 'r': flags |= JOC_TYPE_CONST; goto next;
 222
 223         case 'n': flags |= JOC_TYPE_IN; goto next;
 224         case 'N': flags |= JOC_TYPE_INOUT; goto next;
 225         case 'o': flags |= JOC_TYPE_OUT; goto next;
 226         case 'O': flags |= JOC_TYPE_BYCOPY; goto next;
 227         case 'R': flags |= JOC_TYPE_BYREF; goto next;
 228         case 'V': flags |= JOC_TYPE_ONEWAY; goto next;
 229
 230         next:
 231             next = *(*encoding)++;
 232             goto parse;
 233         break;
 234
 235         default:
 236             CYThrow("invalid type character: '%c' {%s}", next, *encoding - 10);
 237     }
 238
 239     type->flags = flags;
 240
 241     return type;
 242 }
 243
 244 void Parse(CYPool &pool, struct Signature *signature, const char *name, Callback callback) {
 245     const char *temp = name;
 246     Parse_(pool, signature, &temp, '\0', callback);
 247     _assert(temp[-1] == '\0');
 248 }
 249
 250 const char *Unparse(CYPool &pool, const struct Signature *signature) {
 251     const char *value = "";
 252     size_t offset;
 253
 254     for (offset = 0; offset != signature->count; ++offset) {
 255         const char *type = Unparse(pool, signature->elements[offset].type);
 256         value = pool.strcat(value, type, NULL);
 257     }
 258
 259     return value;
 260 }
 261
 262 template <>
 263 const char *Primitive<bool>::Encode(CYPool &pool) const {
 264     return "B";
 265 }
 266
 267 template <>
 268 const char *Primitive<char>::Encode(CYPool &pool) const {
 269     return "c";
 270 }
 271
 272 template <>
 273 const char *Primitive<double>::Encode(CYPool &pool) const {
 274     return "d";
 275 }
 276
 277 template <>
 278 const char *Primitive<float>::Encode(CYPool &pool) const {
 279     return "f";
 280 }
 281
 282 template <>
 283 const char *Primitive<signed char>::Encode(CYPool &pool) const {
 284     return "c";
 285 }
 286
 287 template <>
 288 const char *Primitive<signed int>::Encode(CYPool &pool) const {
 289     return "i";
 290 }
 291
 292 #ifdef __SIZEOF_INT128__
 293 template <>
 294 const char *Primitive<signed __int128>::Encode(CYPool &pool) const {
 295     return "t";
 296 }
 297 #endif
 298
 299 template <>
 300 const char *Primitive<signed long int>::Encode(CYPool &pool) const {
 301     return "l";
 302 }
 303
 304 template <>
 305 const char *Primitive<signed long long int>::Encode(CYPool &pool) const {
 306     return "q";
 307 }
 308
 309 template <>
 310 const char *Primitive<signed short int>::Encode(CYPool &pool) const {
 311     return "s";
 312 }
 313
 314 template <>
 315 const char *Primitive<unsigned char>::Encode(CYPool &pool) const {
 316     return "C";
 317 }
 318
 319 template <>
 320 const char *Primitive<unsigned int>::Encode(CYPool &pool) const {
 321     return "I";
 322 }
 323
 324 #ifdef __SIZEOF_INT128__
 325 template <>
 326 const char *Primitive<unsigned __int128>::Encode(CYPool &pool) const {
 327     return "T";
 328 }
 329 #endif
 330
 331 template <>
 332 const char *Primitive<unsigned long int>::Encode(CYPool &pool) const {
 333     return "L";
 334 }
 335
 336 template <>
 337 const char *Primitive<unsigned long long int>::Encode(CYPool &pool) const {
 338     return "Q";
 339 }
 340
 341 template <>
 342 const char *Primitive<unsigned short int>::Encode(CYPool &pool) const {
 343     return "S";
 344 }
 345
 346 const char *Void::Encode(CYPool &pool) const {
 347     return "v";
 348 }
 349
 350 const char *Unknown::Encode(CYPool &pool) const {
 351     return "?";
 352 }
 353
 354 const char *String::Encode(CYPool &pool) const {
 355     return "*";
 356 }
 357
 358 #ifdef CY_OBJECTIVEC
 359 const char *Meta::Encode(CYPool &pool) const {
 360     return "#";
 361 }
 362
 363 const char *Selector::Encode(CYPool &pool) const {
 364     return ":";
 365 }
 366 #endif
 367
 368 const char *Bits::Encode(CYPool &pool) const {
 369     return pool.strcat("b", pool.itoa(size), NULL);
 370 }
 371
 372 const char *Pointer::Encode(CYPool &pool) const {
 373     return pool.strcat("^", type.Encode(pool), NULL);
 374 }
 375
 376 const char *Array::Encode(CYPool &pool) const {
 377     return pool.strcat("[", pool.itoa(size), type.Encode(pool), "]", NULL);
 378 }
 379
 380 #ifdef CY_OBJECTIVEC
 381 const char *Object::Encode(CYPool &pool) const {
 382     return name == NULL ? "@" : pool.strcat("@\"", name, "\"", NULL);
 383 }
 384 #endif
 385
 386 const char *Enum::Encode(CYPool &pool) const {
 387     return type.Encode(pool);
 388 }
 389
 390 const char *Aggregate::Encode(CYPool &pool) const {
 391     bool reference(signature.count == _not(size_t));
 392     return pool.strcat(overlap ? "(" : "{",
 393         name == NULL ? "?" : name,
 394         reference ? "" : "=",
 395         reference ? "" : Unparse(pool, &signature),
 396     overlap ? ")" : "}", NULL);
 397 }
 398
 399 const char *Function::Encode(CYPool &pool) const {
 400     return "?";
 401 }
 402
 403 #ifdef CY_OBJECTIVEC
 404 const char *Block::Encode(CYPool &pool) const {
 405     return "@?";
 406 }
 407 #endif
 408
 409 const char *Unparse(CYPool &pool, const struct Type *type) {
 410     const char *base(type->Encode(pool));
 411     if (type->flags == 0)
 412         return base;
 413
 414     #define iovec_(base, size) \
 415         (struct iovec) {const_cast<char *>(base), size}
 416
 417     size_t size(strlen(base));
 418     char buffer[7 + size];
 419     size_t offset(0);
 420
 421     if ((type->flags & JOC_TYPE_INOUT) != 0)
 422         buffer[offset++] = 'N';
 423     if ((type->flags & JOC_TYPE_IN) != 0)
 424         buffer[offset++] = 'n';
 425     if ((type->flags & JOC_TYPE_BYCOPY) != 0)
 426         buffer[offset++] = 'O';
 427     if ((type->flags & JOC_TYPE_OUT) != 0)
 428         buffer[offset++] = 'o';
 429     if ((type->flags & JOC_TYPE_BYREF) != 0)
 430         buffer[offset++] = 'R';
 431     if ((type->flags & JOC_TYPE_CONST) != 0)
 432         buffer[offset++] = 'r';
 433     if ((type->flags & JOC_TYPE_ONEWAY) != 0)
 434         buffer[offset++] = 'V';
 435
 436     memcpy(buffer + offset, base, size);
 437     return pool.strmemdup(buffer, offset + size);
 438 }
 439
 440 }