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 'N': flags |= JOC_TYPE_INOUT; goto next;
 206         case 'n': flags |= JOC_TYPE_IN; goto next;
 207         case 'O': flags |= JOC_TYPE_BYCOPY; goto next;
 208         case 'o': flags |= JOC_TYPE_OUT; goto next;
 209         case 'R': flags |= JOC_TYPE_BYREF; goto next;
 210         case 'r': flags |= JOC_TYPE_CONST; goto next;
 211         case 'V': flags |= JOC_TYPE_ONEWAY; goto next;
 212
 213         next:
 214             next = *(*encoding)++;
 215             goto parse;
 216         break;
 217
 218         default:
 219             printf("invalid type character: '%c' {%s}\n", next, *encoding - 10);
 220             _assert(false);
 221     }
 222
 223     type->flags = flags;
 224
 225     return type;
 226 }
 227
 228 void Parse(CYPool &pool, struct Signature *signature, const char *name, Callback callback) {
 229     const char *temp = name;
 230     Parse_(pool, signature, &temp, '\0', callback);
 231     _assert(temp[-1] == '\0');
 232 }
 233
 234 const char *Unparse(CYPool &pool, const struct Signature *signature) {
 235     const char *value = "";
 236     size_t offset;
 237
 238     for (offset = 0; offset != signature->count; ++offset) {
 239         const char *type = Unparse(pool, signature->elements[offset].type);
 240         value = pool.strcat(value, type, NULL);
 241     }
 242
 243     return value;
 244 }
 245
 246 template <>
 247 const char *Primitive<bool>::Encode(CYPool &pool) const {
 248     return "B";
 249 }
 250
 251 template <>
 252 const char *Primitive<char>::Encode(CYPool &pool) const {
 253     return "c";
 254 }
 255
 256 template <>
 257 const char *Primitive<double>::Encode(CYPool &pool) const {
 258     return "d";
 259 }
 260
 261 template <>
 262 const char *Primitive<float>::Encode(CYPool &pool) const {
 263     return "f";
 264 }
 265
 266 template <>
 267 const char *Primitive<signed char>::Encode(CYPool &pool) const {
 268     return "c";
 269 }
 270
 271 template <>
 272 const char *Primitive<signed int>::Encode(CYPool &pool) const {
 273     return "i";
 274 }
 275
 276 template <>
 277 const char *Primitive<signed long int>::Encode(CYPool &pool) const {
 278     return "l";
 279 }
 280
 281 template <>
 282 const char *Primitive<signed long long int>::Encode(CYPool &pool) const {
 283     return "q";
 284 }
 285
 286 template <>
 287 const char *Primitive<signed short int>::Encode(CYPool &pool) const {
 288     return "s";
 289 }
 290
 291 template <>
 292 const char *Primitive<unsigned char>::Encode(CYPool &pool) const {
 293     return "C";
 294 }
 295
 296 template <>
 297 const char *Primitive<unsigned int>::Encode(CYPool &pool) const {
 298     return "I";
 299 }
 300
 301 template <>
 302 const char *Primitive<unsigned long int>::Encode(CYPool &pool) const {
 303     return "L";
 304 }
 305
 306 template <>
 307 const char *Primitive<unsigned long long int>::Encode(CYPool &pool) const {
 308     return "Q";
 309 }
 310
 311 template <>
 312 const char *Primitive<unsigned short int>::Encode(CYPool &pool) const {
 313     return "S";
 314 }
 315
 316 const char *Void::Encode(CYPool &pool) const {
 317     return "v";
 318 }
 319
 320 const char *Unknown::Encode(CYPool &pool) const {
 321     return "?";
 322 }
 323
 324 const char *String::Encode(CYPool &pool) const {
 325     return "*";
 326 }
 327
 328 const char *Meta::Encode(CYPool &pool) const {
 329     return "#";
 330 }
 331
 332 const char *Selector::Encode(CYPool &pool) const {
 333     return ":";
 334 }
 335
 336 const char *Bits::Encode(CYPool &pool) const {
 337     return pool.strcat("b", pool.itoa(size), NULL);
 338 }
 339
 340 const char *Pointer::Encode(CYPool &pool) const {
 341     return pool.strcat("^", type.Encode(pool), NULL);
 342 }
 343
 344 const char *Array::Encode(CYPool &pool) const {
 345     return pool.strcat("[", pool.itoa(size), type.Encode(pool), "]", NULL);
 346 }
 347
 348 const char *Object::Encode(CYPool &pool) const {
 349     return name == NULL ? "@" : pool.strcat("@\"", name, "\"", NULL);
 350 }
 351
 352 const char *Aggregate::Encode(CYPool &pool) const {
 353     return pool.strcat(overlap ? "(" : "{", name == NULL ? "?" : name, "=", Unparse(pool, &signature), overlap ? ")" : "}", NULL);
 354 }
 355
 356 const char *Function::Encode(CYPool &pool) const {
 357     return "?";
 358 }
 359
 360 const char *Block::Encode(CYPool &pool) const {
 361     return "@?";
 362 }
 363
 364 const char *Unparse(CYPool &pool, const struct Type *type) {
 365     const char *base(type->Encode(pool));
 366     if (type->flags == 0)
 367         return base;
 368
 369     #define iovec_(base, size) \
 370         (struct iovec) {const_cast<char *>(base), size}
 371
 372     size_t size(strlen(base));
 373     char buffer[7 + size];
 374     size_t offset(0);
 375
 376     if ((type->flags & JOC_TYPE_INOUT) != 0)
 377         buffer[offset++] = 'N';
 378     if ((type->flags & JOC_TYPE_IN) != 0)
 379         buffer[offset++] = 'n';
 380     if ((type->flags & JOC_TYPE_BYCOPY) != 0)
 381         buffer[offset++] = 'O';
 382     if ((type->flags & JOC_TYPE_OUT) != 0)
 383         buffer[offset++] = 'o';
 384     if ((type->flags & JOC_TYPE_BYREF) != 0)
 385         buffer[offset++] = 'R';
 386     if ((type->flags & JOC_TYPE_CONST) != 0)
 387         buffer[offset++] = 'r';
 388     if ((type->flags & JOC_TYPE_ONEWAY) != 0)
 389         buffer[offset++] = 'V';
 390
 391     memcpy(buffer + offset, base, size);
 392     return pool.strmemdup(buffer, offset + size);
 393 }
 394
 395 }