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                         printf("unterminated specific id type {%s}\n", *encoding - 10);
 123                         _assert(false);
 124                     } else if (!named || quote[1] == eos || quote[1] == '"') {
 125                         name = pool.strmemdup(*encoding + 1, quote - *encoding - 1);
 126                         *encoding = quote + 1;
 127                     } else {
 128                         name = NULL;
 129                     }
 130                 }
 131
 132                 type = new(pool) Object(name);
 133             }
 134
 135         } break;
 136 #endif
 137
 138         case 'B': type = new(pool) Primitive<bool>(); break;
 139         case 'C': type = new(pool) Primitive<unsigned char>(); break;
 140         case 'I': type = new(pool) Primitive<unsigned int>(); break;
 141         case 'L': type = new(pool) Primitive<unsigned long>(); break;
 142         case 'Q': type = new(pool) Primitive<unsigned long long>(); break;
 143         case 'S': type = new(pool) Primitive<unsigned short>(); break;
 144
 145         case '[': {
 146             size_t size(strtoul(*encoding, (char **) encoding, 10));
 147             type = new(pool) Array(*Parse_(pool, encoding, eos, false, callback), size);
 148             if (**encoding != ']') {
 149                 printf("']' != \"%s\"\n", *encoding);
 150                 _assert(false);
 151             }
 152             ++*encoding;
 153         } break;
 154
 155         case '^':
 156             if (**encoding == '"')
 157                 _assert(false); // XXX: why is this here?!?
 158             else {
 159                 type = Parse_(pool, encoding, eos, named, callback);
 160 #ifdef CY_OBJECTIVEC
 161                 Aggregate *aggregate(dynamic_cast<Aggregate *>(type));
 162                 if (aggregate != NULL && strcmp(aggregate->name, "_objc_class") == 0)
 163                     type = new(pool) Meta();
 164                 else
 165 #endif
 166                     type = new(pool) Pointer(*type);
 167             }
 168         break;
 169
 170         case 'b':
 171             type = new(pool) Bits(strtoul(*encoding, (char **) encoding, 10));
 172         break;
 173
 174         case 'c': type = new(pool) Primitive<signed char>(); break;
 175         case 'd': type = new(pool) Primitive<double>(); break;
 176         case 'f': type = new(pool) Primitive<float>(); break;
 177         case 'i': type = new(pool) Primitive<signed int>(); break;
 178         case 'l': type = new(pool) Primitive<signed long>(); break;
 179         case 'q': type = new(pool) Primitive<signed long long>(); break;
 180         case 's': type = new(pool) Primitive<short>(); break;
 181         case 'v': type = new(pool) Void(); break;
 182
 183         case '{':
 184             type = new(pool) Aggregate(false);
 185             next = '}';
 186         goto aggregate;
 187
 188         aggregate: {
 189             Aggregate *aggregate(static_cast<Aggregate *>(type));
 190
 191             char end = next;
 192             const char *begin = *encoding;
 193             do next = *(*encoding)++;
 194             while (
 195                 next != '=' &&
 196                 next != '}'
 197             );
 198             size_t length = *encoding - begin - 1;
 199             if (strncmp(begin, "?", length) != 0)
 200                 aggregate->name = (char *) pool.strmemdup(begin, length);
 201
 202             if (next == '=')
 203                 Parse_(pool, &aggregate->signature, encoding, end, callback);
 204
 205             // XXX: this is a hack to support trivial unions
 206             if (aggregate->signature.count <= 1)
 207                 aggregate->overlap = false;
 208
 209             if (callback != NULL)
 210                 type = (*callback)(pool, aggregate);
 211         } break;
 212
 213         case 'r': flags |= JOC_TYPE_CONST; goto next;
 214
 215         case 'n': flags |= JOC_TYPE_IN; goto next;
 216         case 'N': flags |= JOC_TYPE_INOUT; goto next;
 217         case 'o': flags |= JOC_TYPE_OUT; goto next;
 218         case 'O': flags |= JOC_TYPE_BYCOPY; goto next;
 219         case 'R': flags |= JOC_TYPE_BYREF; goto next;
 220         case 'V': flags |= JOC_TYPE_ONEWAY; goto next;
 221
 222         next:
 223             next = *(*encoding)++;
 224             goto parse;
 225         break;
 226
 227         default:
 228             printf("invalid type character: '%c' {%s}\n", next, *encoding - 10);
 229             _assert(false);
 230     }
 231
 232     type->flags = flags;
 233
 234     return type;
 235 }
 236
 237 void Parse(CYPool &pool, struct Signature *signature, const char *name, Callback callback) {
 238     const char *temp = name;
 239     Parse_(pool, signature, &temp, '\0', callback);
 240     _assert(temp[-1] == '\0');
 241 }
 242
 243 const char *Unparse(CYPool &pool, const struct Signature *signature) {
 244     const char *value = "";
 245     size_t offset;
 246
 247     for (offset = 0; offset != signature->count; ++offset) {
 248         const char *type = Unparse(pool, signature->elements[offset].type);
 249         value = pool.strcat(value, type, NULL);
 250     }
 251
 252     return value;
 253 }
 254
 255 template <>
 256 const char *Primitive<bool>::Encode(CYPool &pool) const {
 257     return "B";
 258 }
 259
 260 template <>
 261 const char *Primitive<char>::Encode(CYPool &pool) const {
 262     return "c";
 263 }
 264
 265 template <>
 266 const char *Primitive<double>::Encode(CYPool &pool) const {
 267     return "d";
 268 }
 269
 270 template <>
 271 const char *Primitive<float>::Encode(CYPool &pool) const {
 272     return "f";
 273 }
 274
 275 template <>
 276 const char *Primitive<signed char>::Encode(CYPool &pool) const {
 277     return "c";
 278 }
 279
 280 template <>
 281 const char *Primitive<signed int>::Encode(CYPool &pool) const {
 282     return "i";
 283 }
 284
 285 template <>
 286 const char *Primitive<signed long int>::Encode(CYPool &pool) const {
 287     return "l";
 288 }
 289
 290 template <>
 291 const char *Primitive<signed long long int>::Encode(CYPool &pool) const {
 292     return "q";
 293 }
 294
 295 template <>
 296 const char *Primitive<signed short int>::Encode(CYPool &pool) const {
 297     return "s";
 298 }
 299
 300 template <>
 301 const char *Primitive<unsigned char>::Encode(CYPool &pool) const {
 302     return "C";
 303 }
 304
 305 template <>
 306 const char *Primitive<unsigned int>::Encode(CYPool &pool) const {
 307     return "I";
 308 }
 309
 310 template <>
 311 const char *Primitive<unsigned long int>::Encode(CYPool &pool) const {
 312     return "L";
 313 }
 314
 315 template <>
 316 const char *Primitive<unsigned long long int>::Encode(CYPool &pool) const {
 317     return "Q";
 318 }
 319
 320 template <>
 321 const char *Primitive<unsigned short int>::Encode(CYPool &pool) const {
 322     return "S";
 323 }
 324
 325 const char *Void::Encode(CYPool &pool) const {
 326     return "v";
 327 }
 328
 329 const char *Unknown::Encode(CYPool &pool) const {
 330     return "?";
 331 }
 332
 333 const char *String::Encode(CYPool &pool) const {
 334     return "*";
 335 }
 336
 337 #ifdef CY_OBJECTIVEC
 338 const char *Meta::Encode(CYPool &pool) const {
 339     return "#";
 340 }
 341
 342 const char *Selector::Encode(CYPool &pool) const {
 343     return ":";
 344 }
 345 #endif
 346
 347 const char *Bits::Encode(CYPool &pool) const {
 348     return pool.strcat("b", pool.itoa(size), NULL);
 349 }
 350
 351 const char *Pointer::Encode(CYPool &pool) const {
 352     return pool.strcat("^", type.Encode(pool), NULL);
 353 }
 354
 355 const char *Array::Encode(CYPool &pool) const {
 356     return pool.strcat("[", pool.itoa(size), type.Encode(pool), "]", NULL);
 357 }
 358
 359 #ifdef CY_OBJECTIVEC
 360 const char *Object::Encode(CYPool &pool) const {
 361     return name == NULL ? "@" : pool.strcat("@\"", name, "\"", NULL);
 362 }
 363 #endif
 364
 365 const char *Aggregate::Encode(CYPool &pool) const {
 366     return pool.strcat(overlap ? "(" : "{", name == NULL ? "?" : name, "=", Unparse(pool, &signature), overlap ? ")" : "}", NULL);
 367 }
 368
 369 const char *Function::Encode(CYPool &pool) const {
 370     return "?";
 371 }
 372
 373 #ifdef CY_OBJECTIVEC
 374 const char *Block::Encode(CYPool &pool) const {
 375     return "@?";
 376 }
 377 #endif
 378
 379 const char *Unparse(CYPool &pool, const struct Type *type) {
 380     const char *base(type->Encode(pool));
 381     if (type->flags == 0)
 382         return base;
 383
 384     #define iovec_(base, size) \
 385         (struct iovec) {const_cast<char *>(base), size}
 386
 387     size_t size(strlen(base));
 388     char buffer[7 + size];
 389     size_t offset(0);
 390
 391     if ((type->flags & JOC_TYPE_INOUT) != 0)
 392         buffer[offset++] = 'N';
 393     if ((type->flags & JOC_TYPE_IN) != 0)
 394         buffer[offset++] = 'n';
 395     if ((type->flags & JOC_TYPE_BYCOPY) != 0)
 396         buffer[offset++] = 'O';
 397     if ((type->flags & JOC_TYPE_OUT) != 0)
 398         buffer[offset++] = 'o';
 399     if ((type->flags & JOC_TYPE_BYREF) != 0)
 400         buffer[offset++] = 'R';
 401     if ((type->flags & JOC_TYPE_CONST) != 0)
 402         buffer[offset++] = 'r';
 403     if ((type->flags & JOC_TYPE_ONEWAY) != 0)
 404         buffer[offset++] = 'V';
 405
 406     memcpy(buffer + offset, base, size);
 407     return pool.strmemdup(buffer, offset + size);
 408 }
 409
 410 }