code.c

   1 /*
   2  * Copyright (C) 2012, 2013
   3  *     Dale Weiler
   4  *     Wolfgang Bumiller
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy of
   7  * this software and associated documentation files (the "Software"), to deal in
   8  * the Software without restriction, including without limitation the rights to
   9  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  10  * of the Software, and to permit persons to whom the Software is furnished to do
  11  * so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in all
  14  * copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24 #include <string.h>
  25 #include "gmqcc.h"
  26
  27 /*
  28  * We could use the old method of casting to uintptr_t then to void*
  29  * or qcint_t; however, it's incredibly unsafe for two reasons.
  30  * 1) The compilers aliasing optimization can legally make it unstable
  31  *    (it's undefined behaviour).
  32  *
  33  * 2) The cast itself depends on fresh storage (newly allocated in which
  34  *    ever function is using the cast macros), the contents of which are
  35  *    transferred in a way that the obligation to release storage is not
  36  *    propagated.
  37  */
  38 typedef union {
  39     void   *enter;
  40     qcint_t leave;
  41 } code_hash_entry_t;
  42
  43 /* Some sanity macros */
  44 #define CODE_HASH_ENTER(ENTRY) ((ENTRY).enter)
  45 #define CODE_HASH_LEAVE(ENTRY) ((ENTRY).leave)
  46
  47 void code_push_statement(code_t *code, prog_section_statement_t *stmt_in, lex_ctx_t ctx)
  48 {
  49     prog_section_statement_t stmt = *stmt_in;
  50
  51     if (OPTS_FLAG(TYPELESS_STORES)) {
  52         switch (stmt.opcode) {
  53             case INSTR_LOAD_S:
  54             case INSTR_LOAD_ENT:
  55             case INSTR_LOAD_FLD:
  56             case INSTR_LOAD_FNC:
  57                 stmt.opcode = INSTR_LOAD_F;
  58                 break;
  59             case INSTR_STORE_S:
  60             case INSTR_STORE_ENT:
  61             case INSTR_STORE_FLD:
  62             case INSTR_STORE_FNC:
  63                 stmt.opcode = INSTR_STORE_F;
  64                 break;
  65             case INSTR_STOREP_S:
  66             case INSTR_STOREP_ENT:
  67             case INSTR_STOREP_FLD:
  68             case INSTR_STOREP_FNC:
  69                 stmt.opcode = INSTR_STOREP_F;
  70                 break;
  71         }
  72     }
  73
  74
  75     if (OPTS_FLAG(SORT_OPERANDS)) {
  76         uint16_t pair;
  77
  78         switch (stmt.opcode) {
  79             case INSTR_MUL_F:
  80             case INSTR_MUL_V:
  81             case INSTR_ADD_F:
  82             case INSTR_EQ_F:
  83             case INSTR_EQ_S:
  84             case INSTR_EQ_E:
  85             case INSTR_EQ_FNC:
  86             case INSTR_NE_F:
  87             case INSTR_NE_V:
  88             case INSTR_NE_S:
  89             case INSTR_NE_E:
  90             case INSTR_NE_FNC:
  91             case INSTR_AND:
  92             case INSTR_OR:
  93             case INSTR_BITAND:
  94             case INSTR_BITOR:
  95                 if (stmt.o1.u1 < stmt.o2.u1) {
  96                     uint16_t a = stmt.o2.u1;
  97                     stmt.o1.u1 = stmt.o2.u1;
  98                     stmt.o2.u1 = a;
  99                 }
 100                 break;
 101
 102             case INSTR_MUL_VF: pair = INSTR_MUL_FV; goto case_pair_gen;
 103             case INSTR_MUL_FV: pair = INSTR_MUL_VF; goto case_pair_gen;
 104             case INSTR_LT:     pair = INSTR_GT;     goto case_pair_gen;
 105             case INSTR_GT:     pair = INSTR_LT;     goto case_pair_gen;
 106             case INSTR_LE:     pair = INSTR_GT;     goto case_pair_gen;
 107             case INSTR_GE:     pair = INSTR_LE;
 108
 109             case_pair_gen:
 110                 if (stmt.o1.u1 < stmt.o2.u1) {
 111                     uint16_t x  = stmt.o1.u1;
 112                     stmt.o1.u1  = stmt.o2.u1;
 113                     stmt.o2.u1  = x;
 114                     stmt.opcode = pair;
 115                 }
 116                 break;
 117         }
 118     }
 119
 120     vec_push(code->statements, stmt);
 121     vec_push(code->linenums,   (int)ctx.line);
 122     vec_push(code->columnnums, (int)ctx.column);
 123 }
 124
 125 void code_pop_statement(code_t *code)
 126 {
 127     vec_pop(code->statements);
 128     vec_pop(code->linenums);
 129     vec_pop(code->columnnums);
 130 }
 131
 132 code_t *code_init() {
 133     static lex_ctx_t                empty_ctx       = {0, 0, 0};
 134     static prog_section_function_t  empty_function  = {0,0,0,0,0,0,0,{0,0,0,0,0,0,0,0}};
 135     static prog_section_statement_t empty_statement = {0,{0},{0},{0}};
 136     static prog_section_def_t       empty_def       = {0, 0, 0};
 137
 138     code_t *code       = (code_t*)mem_a(sizeof(code_t));
 139     int     i          = 0;
 140
 141     memset(code, 0, sizeof(code_t));
 142     code->entfields    = 0;
 143     code->string_cache = util_htnew(OPTS_OPTIMIZATION(OPTIM_OVERLAP_STRINGS) ? 0x100 : 1024);
 144
 145     /*
 146      * The way progs.dat is suppose to work is odd, there needs to be
 147      * some null (empty) statements, functions, and 28 globals
 148      */
 149     for(; i < 28; i++)
 150         vec_push(code->globals, 0);
 151
 152     vec_push(code->chars, '\0');
 153     vec_push(code->functions,  empty_function);
 154
 155     code_push_statement(code, &empty_statement, empty_ctx);
 156
 157     vec_push(code->defs,    empty_def);
 158     vec_push(code->fields,  empty_def);
 159
 160     return code;
 161 }
 162
 163 void *code_util_str_htgeth(hash_table_t *ht, const char *key, size_t bin);
 164
 165 uint32_t code_genstring(code_t *code, const char *str) {
 166     size_t            hash;
 167     code_hash_entry_t existing;
 168
 169     if (!str)
 170         return 0;
 171
 172     if (!*str) {
 173         if (!code->string_cached_empty) {
 174             code->string_cached_empty = vec_size(code->chars);
 175             vec_push(code->chars, 0);
 176         }
 177         return code->string_cached_empty;
 178     }
 179
 180     if (OPTS_OPTIMIZATION(OPTIM_OVERLAP_STRINGS)) {
 181         hash                      = ((unsigned char*)str)[strlen(str)-1];
 182         CODE_HASH_ENTER(existing) = code_util_str_htgeth(code->string_cache, str, hash);
 183     } else {
 184         hash                      = util_hthash(code->string_cache, str);
 185         CODE_HASH_ENTER(existing) = util_htgeth(code->string_cache, str, hash);
 186     }
 187
 188     if (CODE_HASH_ENTER(existing))
 189         return CODE_HASH_LEAVE(existing);
 190
 191     CODE_HASH_LEAVE(existing) = vec_size(code->chars);
 192     vec_append(code->chars, strlen(str)+1, str);
 193
 194     util_htseth(code->string_cache, str, hash, CODE_HASH_ENTER(existing));
 195     return CODE_HASH_LEAVE(existing);
 196 }
 197
 198 qcint_t code_alloc_field (code_t *code, size_t qcsize)
 199 {
 200     qcint_t pos = (qcint_t)code->entfields;
 201     code->entfields += qcsize;
 202     return pos;
 203 }
 204
 205 static size_t code_size_generic(code_t *code, prog_header_t *code_header, bool lno) {
 206     size_t size = 0;
 207     if (lno) {
 208         size += 4;  /* LNOF */
 209         size += sizeof(uint32_t); /* version */
 210         size += sizeof(code_header->defs.length);
 211         size += sizeof(code_header->globals.length);
 212         size += sizeof(code_header->fields.length);
 213         size += sizeof(code_header->statements.length);
 214         size += sizeof(code->linenums[0])   * vec_size(code->linenums);
 215         size += sizeof(code->columnnums[0]) * vec_size(code->columnnums);
 216     } else {
 217         size += sizeof(prog_header_t);
 218         size += sizeof(prog_section_statement_t) * vec_size(code->statements);
 219         size += sizeof(prog_section_def_t)       * vec_size(code->defs);
 220         size += sizeof(prog_section_field_t)     * vec_size(code->fields);
 221         size += sizeof(prog_section_function_t)  * vec_size(code->functions);
 222         size += sizeof(int32_t)                  * vec_size(code->globals);
 223         size += 1                                * vec_size(code->chars);
 224     }
 225     return size;
 226 }
 227
 228 #define code_size_binary(C, H) code_size_generic((C), (H), false)
 229 #define code_size_debug(C, H)  code_size_generic((C), (H), true)
 230
 231 static void code_create_header(code_t *code, prog_header_t *code_header, const char *filename, const char *lnofile) {
 232     size_t i;
 233
 234     code_header->statements.offset = sizeof(prog_header_t);
 235     code_header->statements.length = vec_size(code->statements);
 236     code_header->defs.offset       = code_header->statements.offset + (sizeof(prog_section_statement_t) * vec_size(code->statements));
 237     code_header->defs.length       = vec_size(code->defs);
 238     code_header->fields.offset     = code_header->defs.offset       + (sizeof(prog_section_def_t)       * vec_size(code->defs));
 239     code_header->fields.length     = vec_size(code->fields);
 240     code_header->functions.offset  = code_header->fields.offset     + (sizeof(prog_section_field_t)     * vec_size(code->fields));
 241     code_header->functions.length  = vec_size(code->functions);
 242     code_header->globals.offset    = code_header->functions.offset  + (sizeof(prog_section_function_t)  * vec_size(code->functions));
 243     code_header->globals.length    = vec_size(code->globals);
 244     code_header->strings.offset    = code_header->globals.offset    + (sizeof(int32_t)                  * vec_size(code->globals));
 245     code_header->strings.length    = vec_size(code->chars);
 246     code_header->version           = 6;
 247     code_header->skip              = 0;
 248
 249     if (OPTS_OPTION_BOOL(OPTION_FORCECRC))
 250         code_header->crc16         = OPTS_OPTION_U16(OPTION_FORCED_CRC);
 251     else
 252         code_header->crc16         = code->crc;
 253     code_header->entfield          = code->entfields;
 254
 255     if (OPTS_FLAG(DARKPLACES_STRING_TABLE_BUG)) {
 256         /* >= + P */
 257         vec_push(code->chars, '\0'); /* > */
 258         vec_push(code->chars, '\0'); /* = */
 259         vec_push(code->chars, '\0'); /* P */
 260     }
 261
 262     /* ensure all data is in LE format */
 263     util_endianswap(&code_header->version,    1, sizeof(code_header->version));
 264     util_endianswap(&code_header->crc16,      1, sizeof(code_header->crc16));
 265     util_endianswap(&code_header->statements, 2, sizeof(code_header->statements.offset));
 266     util_endianswap(&code_header->defs,       2, sizeof(code_header->statements.offset));
 267     util_endianswap(&code_header->fields,     2, sizeof(code_header->statements.offset));
 268     util_endianswap(&code_header->functions,  2, sizeof(code_header->statements.offset));
 269     util_endianswap(&code_header->strings,    2, sizeof(code_header->statements.offset));
 270     util_endianswap(&code_header->globals,    2, sizeof(code_header->statements.offset));
 271     util_endianswap(&code_header->entfield,   1, sizeof(code_header->entfield));
 272
 273     /*
 274      * These are not part of the header but we ensure LE format here to save on duplicated
 275      * code.
 276      */
 277     util_endianswap(code->statements, vec_size(code->statements), sizeof(prog_section_statement_t));
 278     util_endianswap(code->defs,       vec_size(code->defs),       sizeof(prog_section_def_t));
 279     util_endianswap(code->fields,     vec_size(code->fields),     sizeof(prog_section_field_t));
 280     util_endianswap(code->functions,  vec_size(code->functions),  sizeof(prog_section_function_t));
 281     util_endianswap(code->globals,    vec_size(code->globals),    sizeof(int32_t));
 282
 283
 284     if (!OPTS_OPTION_BOOL(OPTION_QUIET)) {
 285         if (lnofile)
 286             con_out("writing '%s' and '%s'...\n", filename, lnofile);
 287         else
 288             con_out("writing '%s'\n", filename);
 289     }
 290
 291     if (!OPTS_OPTION_BOOL(OPTION_QUIET) &&
 292         !OPTS_OPTION_BOOL(OPTION_PP_ONLY))
 293     {
 294         char buffer[1024];
 295         con_out("\nOptimizations:\n");
 296         for (i = 0; i < COUNT_OPTIMIZATIONS; ++i) {
 297             if (opts_optimizationcount[i]) {
 298                 util_optimizationtostr(opts_opt_list[i].name, buffer, sizeof(buffer));
 299                 con_out(
 300                     "    %s: %u\n",
 301                     buffer,
 302                     (unsigned int)opts_optimizationcount[i]
 303                 );
 304             }
 305         }
 306     }
 307 }
 308
 309 static void code_stats(const char *filename, const char *lnofile, code_t *code, prog_header_t *code_header) {
 310     if (OPTS_OPTION_BOOL(OPTION_QUIET) ||
 311         OPTS_OPTION_BOOL(OPTION_PP_ONLY))
 312             return;
 313
 314     con_out("\nFile statistics:\n");
 315     con_out("    dat:\n");
 316     con_out("        name: %s\n",         filename);
 317     con_out("        size: %u (bytes)\n", code_size_binary(code, code_header));
 318     con_out("        crc:  0x%04X\n",     code->crc);
 319
 320     if (lnofile) {
 321         con_out("    lno:\n");
 322         con_out("        name: %s\n",  lnofile);
 323         con_out("        size: %u (bytes)\n",  code_size_debug(code, code_header));
 324     }
 325
 326     con_out("\n");
 327 }
 328
 329 /*
 330  * Same principle except this one allocates memory and writes the lno(optional) and the dat file
 331  * directly out to allocated memory. Which is actually very useful for the future library support
 332  * we're going to add.
 333  */
 334 #if 0
 335 static bool code_write_memory(code_t *code, uint8_t **datmem, size_t *sizedat, uint8_t **lnomem, size_t *sizelno) GMQCC_UNUSED {
 336     prog_header_t code_header;
 337     uint32_t      offset  = 0;
 338
 339     if (!datmem)
 340         return false;
 341
 342     code_create_header(code, &code_header, "<<memory>>", "<<memory>>");
 343
 344     #define WRITE_CHUNK(C,X,S)                                     \
 345         do {                                                       \
 346             memcpy((void*)(&(*C)[offset]), (const void*)(X), (S)); \
 347             offset += (S);                                         \
 348         } while (0)
 349
 350     /* Calculate size required to store entire file out to memory */
 351     if (lnomem) {
 352         uint32_t version = 1;
 353
 354         *sizelno = code_size_debug(code, &code_header);
 355         *lnomem  = (uint8_t*)mem_a(*sizelno);
 356
 357         WRITE_CHUNK(lnomem, "LNOF",                         4);
 358         WRITE_CHUNK(lnomem, &version,                       sizeof(version));
 359         WRITE_CHUNK(lnomem, &code_header.defs.length,       sizeof(code_header.defs.length));
 360         WRITE_CHUNK(lnomem, &code_header.globals.length,    sizeof(code_header.globals.length));
 361         WRITE_CHUNK(lnomem, &code_header.fields.length,     sizeof(code_header.fields.length));
 362         WRITE_CHUNK(lnomem, &code_header.statements.length, sizeof(code_header.statements.length));
 363
 364         /* something went terribly wrong */
 365         if (offset != *sizelno) {
 366             mem_d(*lnomem);
 367             *sizelno = 0;
 368             return false;
 369         }
 370         offset = 0;
 371     }
 372
 373     /* Write out the dat */
 374     *sizedat = code_size_binary(code, &code_header);
 375     *datmem  = (uint8_t*)mem_a(*sizedat);
 376
 377     WRITE_CHUNK(datmem, &code_header,     sizeof(prog_header_t));
 378     WRITE_CHUNK(datmem, code->statements, sizeof(prog_section_statement_t) * vec_size(code->statements));
 379     WRITE_CHUNK(datmem, code->defs,       sizeof(prog_section_def_t)       * vec_size(code->defs));
 380     WRITE_CHUNK(datmem, code->fields,     sizeof(prog_section_field_t)     * vec_size(code->fields));
 381     WRITE_CHUNK(datmem, code->functions,  sizeof(prog_section_function_t)  * vec_size(code->functions));
 382     WRITE_CHUNK(datmem, code->globals,    sizeof(int32_t)                  * vec_size(code->globals));
 383     WRITE_CHUNK(datmem, code->chars,      1                                * vec_size(code->chars));
 384
 385     vec_free(code->statements);
 386     vec_free(code->linenums);
 387     vec_free(code->columnnums);
 388     vec_free(code->defs);
 389     vec_free(code->fields);
 390     vec_free(code->functions);
 391     vec_free(code->globals);
 392     vec_free(code->chars);
 393
 394     util_htdel(code->string_cache);
 395     mem_d(code);
 396     code_stats("<<memory>>", (lnomem) ? "<<memory>>" : NULL, code, &code_header);
 397     return true;
 398 }
 399 #endif /*!#if 0 reenable when ready to be used */
 400 #undef WRITE_CHUNK
 401
 402 bool code_write(code_t *code, const char *filename, const char *lnofile) {
 403     prog_header_t  code_header;
 404     fs_file_t     *fp = NULL;
 405
 406     code_create_header(code, &code_header, filename, lnofile);
 407
 408     if (lnofile) {
 409         uint32_t version = 1;
 410
 411         fp = fs_file_open(lnofile, "wb");
 412         if (!fp)
 413             return false;
 414
 415         util_endianswap(&version,         1,                          sizeof(version));
 416         util_endianswap(code->linenums,   vec_size(code->linenums),   sizeof(code->linenums[0]));
 417         util_endianswap(code->columnnums, vec_size(code->columnnums), sizeof(code->columnnums[0]));
 418
 419         if (fs_file_write("LNOF",                          4,                                      1,                          fp) != 1 ||
 420             fs_file_write(&version,                        sizeof(version),                        1,                          fp) != 1 ||
 421             fs_file_write(&code_header.defs.length,        sizeof(code_header.defs.length),        1,                          fp) != 1 ||
 422             fs_file_write(&code_header.globals.length,     sizeof(code_header.globals.length),     1,                          fp) != 1 ||
 423             fs_file_write(&code_header.fields.length,      sizeof(code_header.fields.length),      1,                          fp) != 1 ||
 424             fs_file_write(&code_header.statements.length,  sizeof(code_header.statements.length),  1,                          fp) != 1 ||
 425             fs_file_write(code->linenums,                  sizeof(code->linenums[0]),              vec_size(code->linenums),   fp) != vec_size(code->linenums) ||
 426             fs_file_write(code->columnnums,                sizeof(code->columnnums[0]),            vec_size(code->columnnums), fp) != vec_size(code->columnnums))
 427         {
 428             con_err("failed to write lno file\n");
 429         }
 430
 431         fs_file_close(fp);
 432         fp = NULL;
 433     }
 434
 435     fp = fs_file_open(filename, "wb");
 436     if (!fp)
 437         return false;
 438
 439     if (1                          != fs_file_write(&code_header,     sizeof(prog_header_t)           , 1                         , fp) ||
 440         vec_size(code->statements) != fs_file_write(code->statements, sizeof(prog_section_statement_t), vec_size(code->statements), fp) ||
 441         vec_size(code->defs)       != fs_file_write(code->defs,       sizeof(prog_section_def_t)      , vec_size(code->defs)      , fp) ||
 442         vec_size(code->fields)     != fs_file_write(code->fields,     sizeof(prog_section_field_t)    , vec_size(code->fields)    , fp) ||
 443         vec_size(code->functions)  != fs_file_write(code->functions,  sizeof(prog_section_function_t) , vec_size(code->functions) , fp) ||
 444         vec_size(code->globals)    != fs_file_write(code->globals,    sizeof(int32_t)                 , vec_size(code->globals)   , fp) ||
 445         vec_size(code->chars)      != fs_file_write(code->chars,      1                               , vec_size(code->chars)     , fp))
 446     {
 447         fs_file_close(fp);
 448         return false;
 449     }
 450
 451     fs_file_close(fp);
 452     code_stats(filename, lnofile, code, &code_header);
 453     return true;
 454 }
 455
 456 void code_cleanup(code_t *code) {
 457     vec_free(code->statements);
 458     vec_free(code->linenums);
 459     vec_free(code->columnnums);
 460     vec_free(code->defs);
 461     vec_free(code->fields);
 462     vec_free(code->functions);
 463     vec_free(code->globals);
 464     vec_free(code->chars);
 465
 466     util_htdel(code->string_cache);
 467
 468     mem_d(code);
 469 }