sig/parse.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2013  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU General Public License, Version 3 {{{ */
   6 /*
   7  * Cycript is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 3 of the License,
  10  * or (at your option) any later version.
  11  *
  12  * Cycript is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with Cycript.  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
  29 namespace sig {
  30
  31 void Parse_(CYPool &pool, struct Signature *signature, const char **name, char eos, Callback callback);
  32 struct Type *Parse_(CYPool &pool, const char **name, char eos, bool named, Callback callback);
  33
  34
  35 /* XXX: I really screwed up this time */
  36 void *prealloc_(CYPool &pool, void *odata, size_t osize, size_t nsize) {
  37     void *ndata(pool.malloc<void>(nsize));
  38     memcpy(ndata, odata, osize);
  39     return ndata;
  40 }
  41
  42 void Parse_(CYPool &pool, struct Signature *signature, const char **name, char eos, Callback callback) {
  43     _assert(*name != NULL);
  44
  45     // XXX: this is just a stupid check :(
  46     bool named(**name == '"');
  47
  48     signature->elements = NULL;
  49     signature->count = 0;
  50
  51     for (;;) {
  52         if (**name == eos) {
  53             ++*name;
  54             return;
  55         }
  56
  57         signature->elements = (struct Element *) prealloc_(pool, signature->elements, signature->count * sizeof(struct Element), (signature->count + 1) * sizeof(struct Element));
  58         _assert(signature->elements != NULL);
  59
  60         struct Element *element = &signature->elements[signature->count++];
  61
  62         if (**name != '"')
  63             element->name = NULL;
  64         else {
  65             const char *quote = strchr(++*name, '"');
  66             element->name = pool.strmemdup(*name, quote - *name);
  67             *name = quote + 1;
  68         }
  69
  70         element->type = Parse_(pool, name, eos, named, callback);
  71
  72         if (**name < '0' || **name > '9')
  73             element->offset = _not(size_t);
  74         else {
  75             element->offset = 0;
  76
  77             do
  78                 element->offset = element->offset * 10 + (*(*name)++ - '0');
  79             while (**name >= '0' && **name <= '9');
  80         }
  81     }
  82 }
  83
  84 Type *Parse_(CYPool &pool, const char **name, char eos, bool named, Callback callback) {
  85     char next = *(*name)++;
  86     if (next == '?')
  87         return NULL;
  88
  89     Type *type(new(pool) Type());
  90     _assert(type != NULL);
  91     memset(type, 0, sizeof(Type));
  92
  93   parse:
  94     switch (next) {
  95         case '#': type->primitive = typename_P; break;
  96
  97         case '(':
  98             if (type->data.signature.count < 2)
  99                 type->primitive = struct_P;
 100             else
 101                 type->primitive = union_P;
 102             next = ')';
 103         goto aggregate;
 104
 105         case '*': type->primitive = string_P; break;
 106         case ':': type->primitive = selector_P; break;
 107
 108         case '@': {
 109             char next(**name);
 110
 111             if (next == '?') {
 112                 type->primitive = block_P;
 113                 ++*name;
 114             } else {
 115                 type->primitive = object_P;
 116
 117                 if (next == '"') {
 118                     const char *quote = strchr(*name + 1, '"');
 119                     if (quote == NULL) {
 120                         printf("unterminated specific id type {%s}\n", *name - 10);
 121                         _assert(false);
 122                     } else if (!named || quote[1] == eos || quote[1] == '"') {
 123                         type->name = pool.strmemdup(*name + 1, quote - *name - 1);
 124                         *name = quote + 1;
 125                     }
 126                 }
 127             }
 128
 129         } break;
 130
 131         case 'B': type->primitive = boolean_P; break;
 132         case 'C': type->primitive = uchar_P; break;
 133         case 'I': type->primitive = uint_P; break;
 134         case 'L': type->primitive = ulong_P; break;
 135         case 'Q': type->primitive = ulonglong_P; break;
 136         case 'S': type->primitive = ushort_P; break;
 137
 138         case '[':
 139             type->primitive = array_P;
 140             type->data.data.size = strtoul(*name, (char **) name, 10);
 141             type->data.data.type = Parse_(pool, name, eos, false, callback);
 142             if (**name != ']') {
 143                 printf("']' != \"%s\"\n", *name);
 144                 _assert(false);
 145             }
 146             ++*name;
 147         break;
 148
 149         case '^':
 150             type->primitive = pointer_P;
 151             if (**name == '"') {
 152                 type->data.data.type = NULL;
 153             } else {
 154                 type->data.data.type = Parse_(pool, name, eos, named, callback);
 155                 sig::Type *&target(type->data.data.type);
 156                 if (target != NULL && target->primitive == void_P)
 157                     target = NULL;
 158             }
 159         break;
 160
 161         case 'b':
 162             type->primitive = bit_P;
 163             type->data.data.size = strtoul(*name, (char **) name, 10);
 164         break;
 165
 166         case 'c': type->primitive = char_P; break;
 167         case 'd': type->primitive = double_P; break;
 168         case 'f': type->primitive = float_P; break;
 169         case 'i': type->primitive = int_P; break;
 170         case 'l': type->primitive = long_P; break;
 171         case 'q': type->primitive = longlong_P; break;
 172         case 's': type->primitive = short_P; break;
 173         case 'v': type->primitive = void_P; break;
 174
 175         case '{':
 176             type->primitive = struct_P;
 177             next = '}';
 178         goto aggregate;
 179
 180         aggregate: {
 181             char end = next;
 182             const char *begin = *name;
 183             do next = *(*name)++;
 184             while (
 185                 next != '=' &&
 186                 next != '}'
 187             );
 188             size_t length = *name - begin - 1;
 189             if (strncmp(begin, "?", length) != 0)
 190                 type->name = (char *) pool.strmemdup(begin, length);
 191             else
 192                 type->name = NULL;
 193
 194             // XXX: this types thing is a throwback to JocStrap
 195
 196             if (next == '=')
 197                 Parse_(pool, &type->data.signature, name, end, callback);
 198         } break;
 199
 200         case 'N': type->flags |= JOC_TYPE_INOUT; goto next;
 201         case 'n': type->flags |= JOC_TYPE_IN; goto next;
 202         case 'O': type->flags |= JOC_TYPE_BYCOPY; goto next;
 203         case 'o': type->flags |= JOC_TYPE_OUT; goto next;
 204         case 'R': type->flags |= JOC_TYPE_BYREF; goto next;
 205         case 'r': type->flags |= JOC_TYPE_CONST; goto next;
 206         case 'V': type->flags |= JOC_TYPE_ONEWAY; goto next;
 207
 208         next:
 209             next = *(*name)++;
 210             goto parse;
 211         break;
 212
 213         default:
 214             printf("invalid type character: '%c' {%s}\n", next, *name - 10);
 215             _assert(false);
 216     }
 217
 218     if (callback != NULL)
 219         (*callback)(pool, type);
 220
 221     return type;
 222 }
 223
 224 void Parse(CYPool &pool, struct Signature *signature, const char *name, Callback callback) {
 225     const char *temp = name;
 226     Parse_(pool, signature, &temp, '\0', callback);
 227     _assert(temp[-1] == '\0');
 228 }
 229
 230 const char *Unparse(CYPool &pool, struct Signature *signature) {
 231     const char *value = "";
 232     size_t offset;
 233
 234     for (offset = 0; offset != signature->count; ++offset) {
 235         const char *type = Unparse(pool, signature->elements[offset].type);
 236         value = pool.strcat(value, type, NULL);
 237     }
 238
 239     return value;
 240 }
 241
 242 const char *Unparse_(CYPool &pool, struct Type *type) {
 243     switch (type->primitive) {
 244         case typename_P: return "#";
 245         case union_P: return pool.strcat("(", Unparse(pool, &type->data.signature), ")", NULL);
 246         case string_P: return "*";
 247         case selector_P: return ":";
 248         case block_P: return "@?";
 249         case object_P: return type->name == NULL ? "@" : pool.strcat("@\"", type->name, "\"", NULL);
 250         case boolean_P: return "B";
 251         case uchar_P: return "C";
 252         case uint_P: return "I";
 253         case ulong_P: return "L";
 254         case ulonglong_P: return "Q";
 255         case ushort_P: return "S";
 256
 257         case array_P: {
 258             const char *value = Unparse(pool, type->data.data.type);
 259             return pool.strcat("[", pool.itoa(type->data.data.size), value, "]", NULL);
 260         } break;
 261
 262         case pointer_P: return pool.strcat("^", type->data.data.type == NULL ? "v" : Unparse(pool, type->data.data.type), NULL);
 263         case bit_P: return pool.strcat("b", pool.itoa(type->data.data.size), NULL);
 264         case char_P: return "c";
 265         case double_P: return "d";
 266         case float_P: return "f";
 267         case int_P: return "i";
 268         case long_P: return "l";
 269         case longlong_P: return "q";
 270         case short_P: return "s";
 271         case void_P: return "v";
 272         case struct_P: return pool.strcat("{", type->name == NULL ? "?" : type->name, "=", Unparse(pool, &type->data.signature), "}", NULL);
 273     }
 274
 275     _assert(false);
 276     return NULL;
 277 }
 278
 279 const char *Unparse(CYPool &pool, struct Type *type) {
 280     if (type == NULL)
 281         return "?";
 282
 283     const char *base(Unparse_(pool, type));
 284     if (type->flags == 0)
 285         return base;
 286
 287     #define iovec_(base, size) \
 288         (struct iovec) {const_cast<char *>(base), size}
 289
 290     size_t size(strlen(base));
 291     char buffer[7 + size];
 292     size_t offset(0);
 293
 294     if ((type->flags & JOC_TYPE_INOUT) != 0)
 295         buffer[offset++] = 'N';
 296     if ((type->flags & JOC_TYPE_IN) != 0)
 297         buffer[offset++] = 'n';
 298     if ((type->flags & JOC_TYPE_BYCOPY) != 0)
 299         buffer[offset++] = 'O';
 300     if ((type->flags & JOC_TYPE_OUT) != 0)
 301         buffer[offset++] = 'o';
 302     if ((type->flags & JOC_TYPE_BYREF) != 0)
 303         buffer[offset++] = 'R';
 304     if ((type->flags & JOC_TYPE_CONST) != 0)
 305         buffer[offset++] = 'r';
 306     if ((type->flags & JOC_TYPE_ONEWAY) != 0)
 307         buffer[offset++] = 'V';
 308
 309     memcpy(buffer + offset, base, size);
 310     return pool.strmemdup(buffer, offset + size);
 311 }
 312
 313 }