sig/parse.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2015  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         case '#': type = new(pool) Meta(); break;
  95
  96         case '(':
  97             type = new(pool) Aggregate(true);
  98             next = ')';
  99         goto aggregate;
 100
 101         case '*': type = new(pool) String(); break;
 102         case ':': type = new(pool) Selector(); break;
 103
 104         case '@': {
 105             char next(**encoding);
 106
 107             if (next == '?') {
 108                 type = new(pool) Block();
 109                 ++*encoding;
 110             } else {
 111                 const char *name;
 112                 if (next != '"')
 113                     name = NULL;
 114                 else {
 115                     const char *quote = strchr(*encoding + 1, '"');
 116                     if (quote == NULL) {
 117                         printf("unterminated specific id type {%s}\n", *encoding - 10);
 118                         _assert(false);
 119                     } else if (!named || quote[1] == eos || quote[1] == '"') {
 120                         name = pool.strmemdup(*encoding + 1, quote - *encoding - 1);
 121                         *encoding = quote + 1;
 122                     } else {
 123                         name = NULL;
 124                     }
 125                 }
 126
 127                 type = new(pool) Object(name);
 128             }
 129
 130         } break;
 131
 132         case 'B': type = new(pool) Primitive<bool>(); break;
 133         case 'C': type = new(pool) Primitive<unsigned char>(); break;
 134         case 'I': type = new(pool) Primitive<unsigned int>(); break;
 135         case 'L': type = new(pool) Primitive<unsigned long>(); break;
 136         case 'Q': type = new(pool) Primitive<unsigned long long>(); break;
 137         case 'S': type = new(pool) Primitive<unsigned short>(); break;
 138
 139         case '[': {
 140             size_t size(strtoul(*encoding, (char **) encoding, 10));
 141             type = new(pool) Array(*Parse_(pool, encoding, eos, false, callback), size);
 142             if (**encoding != ']') {
 143                 printf("']' != \"%s\"\n", *encoding);
 144                 _assert(false);
 145             }
 146             ++*encoding;
 147         } break;
 148
 149         case '^':
 150             if (**encoding == '"')
 151                 _assert(false); // XXX: why is this here?!?
 152             else {
 153                 type = Parse_(pool, encoding, eos, named, callback);
 154                 Aggregate *aggregate(dynamic_cast<Aggregate *>(type));
 155                 if (aggregate != NULL && strcmp(aggregate->name, "_objc_class") == 0)
 156                     type = new(pool) Meta();
 157                 else
 158                     type = new(pool) Pointer(*type);
 159             }
 160         break;
 161
 162         case 'b':
 163             type = new(pool) Bits(strtoul(*encoding, (char **) encoding, 10));
 164         break;
 165
 166         case 'c': type = new(pool) Primitive<signed char>(); break;
 167         case 'd': type = new(pool) Primitive<double>(); break;
 168         case 'f': type = new(pool) Primitive<float>(); break;
 169         case 'i': type = new(pool) Primitive<signed int>(); break;
 170         case 'l': type = new(pool) Primitive<signed long>(); break;
 171         case 'q': type = new(pool) Primitive<signed long long>(); break;
 172         case 's': type = new(pool) Primitive<short>(); break;
 173         case 'v': type = new(pool) Void(); break;
 174
 175         case '{':
 176             type = new(pool) Aggregate(false);
 177             next = '}';
 178         goto aggregate;
 179
 180         aggregate: {
 181             Aggregate *aggregate(static_cast<Aggregate *>(type));
 182
 183             char end = next;
 184             const char *begin = *encoding;
 185             do next = *(*encoding)++;
 186             while (
 187                 next != '=' &&
 188                 next != '}'
 189             );
 190             size_t length = *encoding - begin - 1;
 191             if (strncmp(begin, "?", length) != 0)
 192                 aggregate->name = (char *) pool.strmemdup(begin, length);
 193
 194             if (next == '=')
 195                 Parse_(pool, &aggregate->signature, encoding, end, callback);
 196
 197             // XXX: this is a hack to support trivial unions
 198             if (aggregate->signature.count <= 1)
 199                 aggregate->overlap = false;
 200
 201             if (callback != NULL)
 202                 type = (*callback)(pool, aggregate);
 203         } break;
 204
 205         case 'r': flags |= JOC_TYPE_CONST; goto next;
 206
 207         case 'n': flags |= JOC_TYPE_IN; goto next;
 208         case 'N': flags |= JOC_TYPE_INOUT; goto next;
 209         case 'o': flags |= JOC_TYPE_OUT; goto next;
 210         case 'O': flags |= JOC_TYPE_BYCOPY; goto next;
 211         case 'R': flags |= JOC_TYPE_BYREF; goto next;
 212         case 'V': flags |= JOC_TYPE_ONEWAY; goto next;
 213
 214         next:
 215             next = *(*encoding)++;
 216             goto parse;
 217         break;
 218
 219         default:
 220             printf("invalid type character: '%c' {%s}\n", next, *encoding - 10);
 221             _assert(false);
 222     }
 223
 224     type->flags = flags;
 225
 226     return type;
 227 }
 228
 229 void Parse(CYPool &pool, struct Signature *signature, const char *name, Callback callback) {
 230     const char *temp = name;
 231     Parse_(pool, signature, &temp, '\0', callback);
 232     _assert(temp[-1] == '\0');
 233 }
 234
 235 const char *Unparse(CYPool &pool, const struct Signature *signature) {
 236     const char *value = "";
 237     size_t offset;
 238
 239     for (offset = 0; offset != signature->count; ++offset) {
 240         const char *type = Unparse(pool, signature->elements[offset].type);
 241         value = pool.strcat(value, type, NULL);
 242     }
 243
 244     return value;
 245 }
 246
 247 template <>
 248 const char *Primitive<bool>::Encode(CYPool &pool) const {
 249     return "B";
 250 }
 251
 252 template <>
 253 const char *Primitive<char>::Encode(CYPool &pool) const {
 254     return "c";
 255 }
 256
 257 template <>
 258 const char *Primitive<double>::Encode(CYPool &pool) const {
 259     return "d";
 260 }
 261
 262 template <>
 263 const char *Primitive<float>::Encode(CYPool &pool) const {
 264     return "f";
 265 }
 266
 267 template <>
 268 const char *Primitive<signed char>::Encode(CYPool &pool) const {
 269     return "c";
 270 }
 271
 272 template <>
 273 const char *Primitive<signed int>::Encode(CYPool &pool) const {
 274     return "i";
 275 }
 276
 277 template <>
 278 const char *Primitive<signed long int>::Encode(CYPool &pool) const {
 279     return "l";
 280 }
 281
 282 template <>
 283 const char *Primitive<signed long long int>::Encode(CYPool &pool) const {
 284     return "q";
 285 }
 286
 287 template <>
 288 const char *Primitive<signed short int>::Encode(CYPool &pool) const {
 289     return "s";
 290 }
 291
 292 template <>
 293 const char *Primitive<unsigned char>::Encode(CYPool &pool) const {
 294     return "C";
 295 }
 296
 297 template <>
 298 const char *Primitive<unsigned int>::Encode(CYPool &pool) const {
 299     return "I";
 300 }
 301
 302 template <>
 303 const char *Primitive<unsigned long int>::Encode(CYPool &pool) const {
 304     return "L";
 305 }
 306
 307 template <>
 308 const char *Primitive<unsigned long long int>::Encode(CYPool &pool) const {
 309     return "Q";
 310 }
 311
 312 template <>
 313 const char *Primitive<unsigned short int>::Encode(CYPool &pool) const {
 314     return "S";
 315 }
 316
 317 const char *Void::Encode(CYPool &pool) const {
 318     return "v";
 319 }
 320
 321 const char *Unknown::Encode(CYPool &pool) const {
 322     return "?";
 323 }
 324
 325 const char *String::Encode(CYPool &pool) const {
 326     return "*";
 327 }
 328
 329 const char *Meta::Encode(CYPool &pool) const {
 330     return "#";
 331 }
 332
 333 const char *Selector::Encode(CYPool &pool) const {
 334     return ":";
 335 }
 336
 337 const char *Bits::Encode(CYPool &pool) const {
 338     return pool.strcat("b", pool.itoa(size), NULL);
 339 }
 340
 341 const char *Pointer::Encode(CYPool &pool) const {
 342     return pool.strcat("^", type.Encode(pool), NULL);
 343 }
 344
 345 const char *Array::Encode(CYPool &pool) const {
 346     return pool.strcat("[", pool.itoa(size), type.Encode(pool), "]", NULL);
 347 }
 348
 349 const char *Object::Encode(CYPool &pool) const {
 350     return name == NULL ? "@" : pool.strcat("@\"", name, "\"", NULL);
 351 }
 352
 353 const char *Aggregate::Encode(CYPool &pool) const {
 354     return pool.strcat(overlap ? "(" : "{", name == NULL ? "?" : name, "=", Unparse(pool, &signature), overlap ? ")" : "}", NULL);
 355 }
 356
 357 const char *Function::Encode(CYPool &pool) const {
 358     return "?";
 359 }
 360
 361 const char *Block::Encode(CYPool &pool) const {
 362     return "@?";
 363 }
 364
 365 const char *Unparse(CYPool &pool, const struct Type *type) {
 366     const char *base(type->Encode(pool));
 367     if (type->flags == 0)
 368         return base;
 369
 370     #define iovec_(base, size) \
 371         (struct iovec) {const_cast<char *>(base), size}
 372
 373     size_t size(strlen(base));
 374     char buffer[7 + size];
 375     size_t offset(0);
 376
 377     if ((type->flags & JOC_TYPE_INOUT) != 0)
 378         buffer[offset++] = 'N';
 379     if ((type->flags & JOC_TYPE_IN) != 0)
 380         buffer[offset++] = 'n';
 381     if ((type->flags & JOC_TYPE_BYCOPY) != 0)
 382         buffer[offset++] = 'O';
 383     if ((type->flags & JOC_TYPE_OUT) != 0)
 384         buffer[offset++] = 'o';
 385     if ((type->flags & JOC_TYPE_BYREF) != 0)
 386         buffer[offset++] = 'R';
 387     if ((type->flags & JOC_TYPE_CONST) != 0)
 388         buffer[offset++] = 'r';
 389     if ((type->flags & JOC_TYPE_ONEWAY) != 0)
 390         buffer[offset++] = 'V';
 391
 392     memcpy(buffer + offset, base, size);
 393     return pool.strmemdup(buffer, offset + size);
 394 }
 395
 396 }