gcc/config/nvptx/mkoffload.c

   1 /* Offload image generation tool for PTX.
   2
   3    Copyright (C) 2014-2015 Free Software Foundation, Inc.
   4
   5    Contributed by Nathan Sidwell <nathan@codesourcery.com> and
   6    Bernd Schmidt <bernds@codesourcery.com>.
   7
   8    This file is part of GCC.
   9
  10    GCC is free software; you can redistribute it and/or modify it
  11    under the terms of the GNU General Public License as published
  12    by the Free Software Foundation; either version 3, or (at your
  13    option) any later version.
  14
  15    GCC is distributed in the hope that it will be useful, but WITHOUT
  16    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  18    License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with GCC; see the file COPYING3.  If not see
  22    <http://www.gnu.org/licenses/>.  */
  23
  24 /* Munges PTX assembly into a C source file defining the PTX code as a
  25    string.
  26
  27    This is not a complete assembler.  We presume the source is well
  28    formed from the compiler and can die horribly if it is not.  */
  29
  30 #include "config.h"
  31 #include "system.h"
  32 #include "coretypes.h"
  33 #include "intl.h"
  34 #include <libgen.h>
  35 #include "obstack.h"
  36 #include "diagnostic-core.h"
  37 #include "collect-utils.h"
  38 #include "gomp-constants.h"
  39
  40 const char tool_name[] = "nvptx mkoffload";
  41
  42 #define COMMENT_PREFIX "#"
  43
  44 typedef enum Kind
  45 {
  46   /* 0-ff used for single char tokens */
  47   K_symbol = 0x100, /* a symbol */
  48   K_label,  /* a label defn (i.e. symbol:) */
  49   K_ident,  /* other ident */
  50   K_dotted, /* dotted identifier */
  51   K_number,
  52   K_string,
  53   K_comment
  54 } Kind;
  55
  56 typedef struct Token
  57 {
  58   unsigned short kind : 12;
  59   unsigned short space : 1; /* preceded by space */
  60   unsigned short end : 1;   /* succeeded by end of line */
  61   /* Length of token */
  62   unsigned short len;
  63
  64   /* Token itself */
  65   char const *ptr;
  66 } Token;
  67
  68 /* statement info */
  69 typedef enum Vis
  70 {
  71   V_dot = 0,  /* random pseudo */
  72   V_var = 1,  /* var decl/defn */
  73   V_func = 2, /* func decl/defn */
  74   V_insn = 3, /* random insn */
  75   V_label = 4, /* label defn */
  76   V_comment = 5,
  77   V_pred = 6,  /* predicate */
  78   V_mask = 0x7,
  79   V_global = 0x08, /* globalize */
  80   V_weak = 0x10,   /* weakly globalize */
  81   V_no_eol = 0x20, /* no end of line */
  82   V_prefix_comment = 0x40 /* prefixed comment */
  83 } Vis;
  84
  85 typedef struct Stmt
  86 {
  87   struct Stmt *next;
  88   Token *tokens;
  89   unsigned char vis;
  90   unsigned len : 12;
  91   unsigned sym : 12;
  92 } Stmt;
  93
  94 struct id_map
  95 {
  96   id_map *next;
  97   char *ptx_name;
  98 };
  99
 100 static const char *read_file (FILE *);
 101 static Token *tokenize (const char *);
 102
 103 static void write_token (FILE *, const Token *);
 104 static void write_tokens (FILE *, const Token *, unsigned, int);
 105
 106 static Stmt *alloc_stmt (unsigned, Token *, Token *, const Token *);
 107 #define alloc_comment(S,E) alloc_stmt (V_comment, S, E, 0)
 108 #define append_stmt(V, S) ((S)->next = *(V), *(V) = (S))
 109 static Stmt *rev_stmts (Stmt *);
 110 static void write_stmt (FILE *, const Stmt *);
 111 static void write_stmts (FILE *, const Stmt *);
 112
 113 static Token *parse_insn (Token *);
 114 static Token *parse_list_nosemi (Token *);
 115 static Token *parse_init (Token *);
 116 static Token *parse_file (Token *);
 117
 118 static Stmt *decls;
 119 static Stmt *vars;
 120 static Stmt *fns;
 121
 122 static id_map *func_ids, **funcs_tail = &func_ids;
 123 static id_map *var_ids, **vars_tail = &var_ids;
 124
 125 /* Files to unlink.  */
 126 static const char *ptx_name;
 127 static const char *ptx_cfile_name;
 128
 129 /* Delete tempfiles.  */
 130
 131 /* Unlink a temporary file unless requested otherwise.  */
 132
 133 void
 134 maybe_unlink (const char *file)
 135 {
 136   if (! debug)
 137     {
 138       if (unlink_if_ordinary (file)
 139           && errno != ENOENT)
 140         fatal_error (input_location, "deleting file %s: %m", file);
 141     }
 142   else
 143     fprintf (stderr, "[Leaving %s]\n", file);
 144 }
 145
 146 void
 147 tool_cleanup (bool)
 148 {
 149 }
 150
 151 /* Add or change the value of an environment variable, outputting the
 152    change to standard error if in verbose mode.  */
 153 static void
 154 xputenv (const char *string)
 155 {
 156   if (verbose)
 157     fprintf (stderr, "%s\n", string);
 158   putenv (CONST_CAST (char *, string));
 159 }
 160
 161
 162 static void
 163 record_id (const char *p1, id_map ***where)
 164 {
 165   const char *end = strchr (p1, '\n');
 166   if (!end)
 167     fatal_error (input_location, "malformed ptx file");
 168
 169   id_map *v = XNEW (id_map);
 170   size_t len = end - p1;
 171   v->ptx_name = XNEWVEC (char, len + 1);
 172   memcpy (v->ptx_name, p1, len);
 173   v->ptx_name[len] = '\0';
 174   v->next = NULL;
 175   id_map **tail = *where;
 176   *tail = v;
 177   *where = &v->next;
 178 }
 179
 180 /* Read the whole input file.  It will be NUL terminated (but
 181    remember, there could be a NUL in the file itself.  */
 182
 183 static const char *
 184 read_file (FILE *stream)
 185 {
 186   size_t alloc = 16384;
 187   size_t base = 0;
 188   char *buffer;
 189
 190   if (!fseek (stream, 0, SEEK_END))
 191     {
 192       /* Get the file size.  */
 193       long s = ftell (stream);
 194       if (s >= 0)
 195         alloc = s + 100;
 196       fseek (stream, 0, SEEK_SET);
 197     }
 198   buffer = XNEWVEC (char, alloc);
 199
 200   for (;;)
 201     {
 202       size_t n = fread (buffer + base, 1, alloc - base - 1, stream);
 203
 204       if (!n)
 205         break;
 206       base += n;
 207       if (base + 1 == alloc)
 208         {
 209           alloc *= 2;
 210           buffer = XRESIZEVEC (char, buffer, alloc);
 211         }
 212     }
 213   buffer[base] = 0;
 214   return buffer;
 215 }
 216
 217 /* Read a token, advancing ptr.
 218    If we read a comment, append it to the comments block. */
 219
 220 static Token *
 221 tokenize (const char *ptr)
 222 {
 223   unsigned alloc = 1000;
 224   unsigned num = 0;
 225   Token *toks = XNEWVEC (Token, alloc);
 226   int in_comment = 0;
 227   int not_comment = 0;
 228
 229   for (;; num++)
 230     {
 231       const char *base;
 232       unsigned kind;
 233       int ws = 0;
 234       int eol = 0;
 235
 236     again:
 237       base = ptr;
 238       if (in_comment)
 239         goto block_comment;
 240       switch (kind = *ptr++)
 241         {
 242         default:
 243           break;
 244
 245         case '\n':
 246           eol = 1;
 247           /* Fall through */
 248         case ' ':
 249         case '\t':
 250         case '\r':
 251         case '\v':
 252           /* White space */
 253           ws = not_comment;
 254           goto again;
 255
 256         case '/':
 257           {
 258             if (*ptr == '/')
 259               {
 260                 /* line comment.  Do not include trailing \n */
 261                 base += 2;
 262                 for (; *ptr; ptr++)
 263                   if (*ptr == '\n')
 264                     break;
 265                 kind = K_comment;
 266               }
 267             else if (*ptr == '*')
 268               {
 269                 /* block comment */
 270                 base += 2;
 271                 ptr++;
 272
 273               block_comment:
 274                 eol = in_comment;
 275                 in_comment = 1;
 276                 for (; *ptr; ptr++)
 277                   {
 278                     if (*ptr == '\n')
 279                       {
 280                         ptr++;
 281                         break;
 282                       }
 283                     if (ptr[0] == '*' && ptr[1] == '/')
 284                       {
 285                         in_comment = 2;
 286                         ptr += 2;
 287                         break;
 288                       }
 289                   }
 290                 kind = K_comment;
 291               }
 292             else
 293               break;
 294           }
 295           break;
 296
 297         case '"':
 298           /* quoted string */
 299           kind = K_string;
 300           while (*ptr)
 301             if (*ptr == '"')
 302               {
 303                 ptr++;
 304                 break;
 305               }
 306             else if (*ptr++ == '\\')
 307               ptr++;
 308           break;
 309
 310         case '.':
 311           if (*ptr < '0' || *ptr > '9')
 312             {
 313               kind = K_dotted;
 314               ws = not_comment;
 315               goto ident;
 316             }
 317           /* FALLTHROUGH */
 318         case '0'...'9':
 319           kind = K_number;
 320           goto ident;
 321           break;
 322
 323         case '$':  /* local labels.  */
 324         case '%':  /* register names, pseudoes etc */
 325           kind = K_ident;
 326           goto ident;
 327
 328         case 'a'...'z':
 329         case 'A'...'Z':
 330         case '_':
 331           kind = K_symbol; /* possible symbol name */
 332         ident:
 333           for (; *ptr; ptr++)
 334             {
 335               if (*ptr >= 'A' && *ptr <= 'Z')
 336                 continue;
 337               if (*ptr >= 'a' && *ptr <= 'z')
 338                 continue;
 339               if (*ptr >= '0' && *ptr <= '9')
 340                 continue;
 341               if (*ptr == '_' || *ptr == '$')
 342                 continue;
 343               if (*ptr == '.' && kind != K_dotted)
 344                 /* Idents starting with a dot, cannot have internal dots. */
 345                 continue;
 346               if ((*ptr == '+' || *ptr == '-')
 347                   && kind == K_number
 348                   && (ptr[-1] == 'e' || ptr[-1] == 'E'
 349                       || ptr[-1] == 'p' || ptr[-1] == 'P'))
 350                 /* exponent */
 351                 continue;
 352               break;
 353             }
 354           if (*ptr == ':')
 355             {
 356               ptr++;
 357               kind = K_label;
 358             }
 359           break;
 360         }
 361
 362       if (alloc == num)
 363         {
 364           alloc *= 2;
 365           toks = XRESIZEVEC (Token, toks, alloc);
 366         }
 367       Token *tok = toks + num;
 368
 369       tok->kind = kind;
 370       tok->space = ws;
 371       tok->end = 0;
 372       tok->ptr = base;
 373       tok->len = ptr - base - in_comment;
 374       in_comment &= 1;
 375       not_comment = kind != K_comment;
 376       if (eol && num)
 377         tok[-1].end = 1;
 378       if (!kind)
 379         break;
 380     }
 381
 382   return toks;
 383 }
 384
 385 /* Write an encoded token. */
 386
 387 static void
 388 write_token (FILE *out, Token const *tok)
 389 {
 390   if (tok->space)
 391     fputc (' ', out);
 392
 393   switch (tok->kind)
 394     {
 395     case K_string:
 396       {
 397         const char *c = tok->ptr + 1;
 398         size_t len = tok->len - 2;
 399
 400         fputs ("\\\"", out);
 401         while (len)
 402           {
 403             const char *bs = (const char *)memchr (c, '\\', len);
 404             size_t l = bs ? bs - c : len;
 405
 406             fprintf (out, "%.*s", (int)l, c);
 407             len -= l;
 408             c += l;
 409             if (bs)
 410               {
 411                 fputs ("\\\\", out);
 412                 len--, c++;
 413               }
 414           }
 415         fputs ("\\\"", out);
 416       }
 417       break;
 418
 419     default:
 420       /* All other tokens shouldn't have anything magic in them */
 421       fprintf (out, "%.*s", tok->len, tok->ptr);
 422       break;
 423     }
 424   if (tok->end)
 425     fputs ("\\n", out);
 426 }
 427
 428 static void
 429 write_tokens (FILE *out, Token const *toks, unsigned len, int spc)
 430 {
 431   fputs ("\t\"", out);
 432   for (; len--; toks++)
 433     write_token (out, toks);
 434   if (spc)
 435     fputs (" ", out);
 436   fputs ("\"", out);
 437 }
 438
 439 static Stmt *
 440 alloc_stmt (unsigned vis, Token *tokens, Token *end, Token const *sym)
 441 {
 442   static unsigned alloc = 0;
 443   static Stmt *heap = 0;
 444
 445   if (!alloc)
 446     {
 447       alloc = 1000;
 448       heap = XNEWVEC (Stmt, alloc);
 449     }
 450
 451   Stmt *stmt = heap++;
 452   alloc--;
 453
 454   tokens->space = 0;
 455   stmt->next = 0;
 456   stmt->vis = vis;
 457   stmt->tokens = tokens;
 458   stmt->len = end - tokens;
 459   stmt->sym = sym ? sym - tokens : ~0;
 460
 461   return stmt;
 462 }
 463
 464 static Stmt *
 465 rev_stmts (Stmt *stmt)
 466 {
 467   Stmt *prev = 0;
 468   Stmt *next;
 469
 470   while (stmt)
 471     {
 472       next = stmt->next;
 473       stmt->next = prev;
 474       prev = stmt;
 475       stmt = next;
 476     }
 477
 478   return prev;
 479 }
 480
 481 static void
 482 write_stmt (FILE *out, const Stmt *stmt)
 483 {
 484   if ((stmt->vis & V_mask) != V_comment)
 485     {
 486       write_tokens (out, stmt->tokens, stmt->len,
 487                     (stmt->vis & V_mask) == V_pred);
 488       fputs (stmt->vis & V_no_eol ? "\t" : "\n", out);
 489     }
 490 }
 491
 492 static void
 493 write_stmts (FILE *out, const Stmt *stmts)
 494 {
 495   for (; stmts; stmts = stmts->next)
 496     write_stmt (out, stmts);
 497 }
 498
 499 static Token *
 500 parse_insn (Token *tok)
 501 {
 502   unsigned depth = 0;
 503
 504   do
 505     {
 506       Stmt *stmt;
 507       Token *sym = 0;
 508       unsigned s = V_insn;
 509       Token *start = tok;
 510
 511       switch (tok++->kind)
 512         {
 513         case K_comment:
 514           while (tok->kind == K_comment)
 515             tok++;
 516           stmt = alloc_comment (start, tok);
 517           append_stmt (&fns, stmt);
 518           continue;
 519
 520         case '{':
 521           depth++;
 522           break;
 523
 524         case '}':
 525           depth--;
 526           break;
 527
 528         case K_label:
 529           if (tok[-1].ptr[0] != '$')
 530             sym = tok - 1;
 531           tok[-1].end = 1;
 532           s = V_label;
 533           break;
 534
 535         case '@':
 536           tok->space = 0;
 537           if (tok->kind == '!')
 538             tok++;
 539           if (tok->kind == K_symbol)
 540             sym = tok;
 541           tok++;
 542           s = V_pred;
 543           break;
 544
 545         default:
 546           for (; tok->kind != ';'; tok++)
 547             {
 548               if (tok->kind == ',')
 549                 tok[1].space = 0;
 550               else if (tok->kind == K_symbol)
 551                 sym = tok;
 552             }
 553           tok++->end = 1;
 554           break;
 555         }
 556
 557       stmt = alloc_stmt (s, start, tok, sym);
 558       append_stmt (&fns, stmt);
 559
 560       if (!tok[-1].end && tok[0].kind == K_comment)
 561         {
 562           stmt->vis |= V_no_eol;
 563           stmt = alloc_comment (tok, tok + 1);
 564           append_stmt (&fns, stmt);
 565           tok++;
 566         }
 567     }
 568   while (depth);
 569
 570   return tok;
 571 }
 572
 573 /* comma separated list of tokens */
 574
 575 static Token *
 576 parse_list_nosemi (Token *tok)
 577 {
 578   Token *start = tok;
 579
 580   do
 581     if (!(++tok)->kind)
 582       break;
 583   while ((++tok)->kind == ',');
 584
 585   tok[-1].end = 1;
 586   Stmt *stmt = alloc_stmt (V_dot, start, tok, 0);
 587   append_stmt (&decls, stmt);
 588
 589   return tok;
 590 }
 591
 592 #define is_keyword(T,S) \
 593   (sizeof (S) == (T)->len && !memcmp ((T)->ptr + 1, (S), (T)->len - 1))
 594
 595 static Token *
 596 parse_init (Token *tok)
 597 {
 598   for (;;)
 599     {
 600       Token *start = tok;
 601       Token const *sym = 0;
 602       Stmt *stmt;
 603
 604       if (tok->kind == K_comment)
 605         {
 606           while (tok->kind == K_comment)
 607             tok++;
 608           stmt = alloc_comment (start, tok);
 609           append_stmt (&vars, stmt);
 610           start = tok;
 611         }
 612
 613       if (tok->kind == '{')
 614         tok[1].space = 0;
 615       for (; tok->kind != ',' && tok->kind != ';'; tok++)
 616         if (tok->kind == K_symbol)
 617           sym = tok;
 618       tok[1].space = 0;
 619       int end = tok++->kind == ';';
 620       stmt = alloc_stmt (V_insn, start, tok, sym);
 621       append_stmt (&vars, stmt);
 622       if (!tok[-1].end && tok->kind == K_comment)
 623         {
 624           stmt->vis |= V_no_eol;
 625           stmt = alloc_comment (tok, tok + 1);
 626           append_stmt (&vars, stmt);
 627           tok++;
 628         }
 629       if (end)
 630         break;
 631     }
 632   return tok;
 633 }
 634
 635 static Token *
 636 parse_file (Token *tok)
 637 {
 638   Stmt *comment = 0;
 639
 640   if (tok->kind == K_comment)
 641     {
 642       Token *start = tok;
 643
 644       while (tok->kind == K_comment)
 645         {
 646           if (strncmp (tok->ptr, ":VAR_MAP ", 9) == 0)
 647             record_id (tok->ptr + 9, &vars_tail);
 648           if (strncmp (tok->ptr, ":FUNC_MAP ", 10) == 0)
 649             record_id (tok->ptr + 10, &funcs_tail);
 650           tok++;
 651         }
 652       comment = alloc_comment (start, tok);
 653       comment->vis |= V_prefix_comment;
 654     }
 655
 656   if (tok->kind == K_dotted)
 657     {
 658       if (is_keyword (tok, "version")
 659           || is_keyword (tok, "target")
 660           || is_keyword (tok, "address_size"))
 661         {
 662           if (comment)
 663             append_stmt (&decls, comment);
 664           tok = parse_list_nosemi (tok);
 665         }
 666       else
 667         {
 668           unsigned vis = 0;
 669           const Token *def = 0;
 670           unsigned is_decl = 0;
 671           Token *start;
 672
 673           for (start = tok;
 674                tok->kind && tok->kind != '=' && tok->kind != K_comment
 675                  && tok->kind != '{' && tok->kind != ';'; tok++)
 676             {
 677               if (is_keyword (tok, "global")
 678                   || is_keyword (tok, "const"))
 679                 vis |= V_var;
 680               else if (is_keyword (tok, "func")
 681                        || is_keyword (tok, "entry"))
 682                 vis |= V_func;
 683               else if (is_keyword (tok, "visible"))
 684                 vis |= V_global;
 685               else if (is_keyword (tok, "extern"))
 686                 is_decl = 1;
 687               else if (is_keyword (tok, "weak"))
 688                 vis |= V_weak;
 689               if (tok->kind == '(')
 690                 {
 691                   tok[1].space = 0;
 692                   tok[0].space = 1;
 693                 }
 694               else if (tok->kind == ')' && tok[1].kind != ';')
 695                 tok[1].space = 1;
 696
 697               if (tok->kind == K_symbol)
 698                 def = tok;
 699             }
 700
 701           if (!tok->kind)
 702             {
 703               /* end of file */
 704               if (comment)
 705                 append_stmt (&fns, comment);
 706             }
 707           else if (tok->kind == '{'
 708                    || tok->kind == K_comment)
 709             {
 710               /* function defn */
 711               Stmt *stmt = alloc_stmt (vis, start, tok, def);
 712               if (comment)
 713                 {
 714                   append_stmt (&fns, comment);
 715                   stmt->vis |= V_prefix_comment;
 716                 }
 717               append_stmt (&fns, stmt);
 718               tok = parse_insn (tok);
 719             }
 720           else
 721             {
 722               int assign = tok->kind == '=';
 723
 724               tok++->end = 1;
 725               if ((vis & V_mask) == V_var && !is_decl)
 726                 {
 727                   /* variable */
 728                   Stmt *stmt = alloc_stmt (vis, start, tok, def);
 729                   if (comment)
 730                     {
 731                       append_stmt (&vars, comment);
 732                       stmt->vis |= V_prefix_comment;
 733                     }
 734                   append_stmt (&vars, stmt);
 735                   if (assign)
 736                     tok = parse_init (tok);
 737                 }
 738               else
 739                 {
 740                   /* declaration */
 741                   Stmt *stmt = alloc_stmt (vis, start, tok, 0);
 742                   if (comment)
 743                     {
 744                       append_stmt (&decls, comment);
 745                       stmt->vis |= V_prefix_comment;
 746                     }
 747                   append_stmt (&decls, stmt);
 748                 }
 749             }
 750         }
 751     }
 752   else
 753     {
 754       /* Something strange.  Ignore it.  */
 755       if (comment)
 756         append_stmt (&fns, comment);
 757
 758       while (tok->kind && !tok->end)
 759         tok++;
 760     }
 761   return tok;
 762 }
 763
 764 static void
 765 process (FILE *in, FILE *out)
 766 {
 767   const char *input = read_file (in);
 768   Token *tok = tokenize (input);
 769
 770   do
 771     tok = parse_file (tok);
 772   while (tok->kind);
 773
 774   fprintf (out, "static const char ptx_code[] = \n");
 775   write_stmts (out, rev_stmts (decls));
 776   write_stmts (out, rev_stmts (vars));
 777   write_stmts (out, rev_stmts (fns));
 778   fprintf (out, ";\n\n");
 779   fprintf (out, "static const char *var_mappings[] = {\n");
 780   for (id_map *id = var_ids; id; id = id->next)
 781     fprintf (out, "\t\"%s\"%s\n", id->ptx_name, id->next ? "," : "");
 782   fprintf (out, "};\n\n");
 783   fprintf (out, "static const char *func_mappings[] = {\n");
 784   for (id_map *id = func_ids; id; id = id->next)
 785     fprintf (out, "\t\"%s\"%s\n", id->ptx_name, id->next ? "," : "");
 786   fprintf (out, "};\n\n");
 787
 788   fprintf (out, "static const void *target_data[] = {\n");
 789   fprintf (out, "  ptx_code, var_mappings, func_mappings\n");
 790   fprintf (out, "};\n\n");
 791
 792   fprintf (out, "extern void GOMP_offload_register (const void *, int, void *);\n");
 793
 794   fprintf (out, "extern void *__OFFLOAD_TABLE__[];\n\n");
 795   fprintf (out, "static __attribute__((constructor)) void init (void)\n{\n");
 796   fprintf (out, "  GOMP_offload_register (__OFFLOAD_TABLE__, %d,\n",
 797            GOMP_DEVICE_NVIDIA_PTX);
 798   fprintf (out, "                         &target_data);\n");
 799   fprintf (out, "};\n");
 800 }
 801
 802 static void
 803 compile_native (const char *infile, const char *outfile, const char *compiler)
 804 {
 805   const char *collect_gcc_options = getenv ("COLLECT_GCC_OPTIONS");
 806   if (!collect_gcc_options)
 807     fatal_error (input_location,
 808                  "environment variable COLLECT_GCC_OPTIONS must be set");
 809
 810   struct obstack argv_obstack;
 811   obstack_init (&argv_obstack);
 812   obstack_ptr_grow (&argv_obstack, compiler);
 813   obstack_ptr_grow (&argv_obstack, infile);
 814   obstack_ptr_grow (&argv_obstack, "-c");
 815   obstack_ptr_grow (&argv_obstack, "-o");
 816   obstack_ptr_grow (&argv_obstack, outfile);
 817   obstack_ptr_grow (&argv_obstack, NULL);
 818
 819   const char **new_argv = XOBFINISH (&argv_obstack, const char **);
 820   fork_execute (new_argv[0], CONST_CAST (char **, new_argv), true);
 821   obstack_free (&argv_obstack, NULL);
 822 }
 823
 824 int
 825 main (int argc, char **argv)
 826 {
 827   FILE *in = stdin;
 828   FILE *out = stdout;
 829   const char *outname = 0;
 830
 831   char *collect_gcc = getenv ("COLLECT_GCC");
 832   if (collect_gcc == NULL)
 833     fatal_error (input_location, "COLLECT_GCC must be set.");
 834   const char *gcc_path = dirname (ASTRDUP (collect_gcc));
 835   const char *gcc_exec = basename (ASTRDUP (collect_gcc));
 836
 837   size_t len = (strlen (gcc_path) + 1
 838                 + strlen (GCC_INSTALL_NAME)
 839                 + 1);
 840   char *driver = XALLOCAVEC (char, len);
 841
 842   if (strcmp (gcc_exec, collect_gcc) == 0)
 843     /* collect_gcc has no path, so it was found in PATH.  Make sure we also
 844        find accel-gcc in PATH.  */
 845     gcc_path = NULL;
 846
 847   int driver_used = 0;
 848   if (gcc_path != NULL)
 849     driver_used = sprintf (driver, "%s/", gcc_path);
 850   sprintf (driver + driver_used, "%s", GCC_INSTALL_NAME);
 851
 852   /* We may be called with all the arguments stored in some file and
 853      passed with @file.  Expand them into argv before processing.  */
 854   expandargv (&argc, &argv);
 855
 856   struct obstack argv_obstack;
 857   obstack_init (&argv_obstack);
 858   obstack_ptr_grow (&argv_obstack, driver);
 859   obstack_ptr_grow (&argv_obstack, "-xlto");
 860   obstack_ptr_grow (&argv_obstack, "-m64");
 861   obstack_ptr_grow (&argv_obstack, "-S");
 862
 863   for (int ix = 1; ix != argc; ix++)
 864     {
 865       if (!strcmp (argv[ix], "-o") && ix + 1 != argc)
 866         outname = argv[++ix];
 867       else
 868         obstack_ptr_grow (&argv_obstack, argv[ix]);
 869     }
 870
 871   ptx_name = make_temp_file (".mkoffload");
 872   obstack_ptr_grow (&argv_obstack, "-o");
 873   obstack_ptr_grow (&argv_obstack, ptx_name);
 874   obstack_ptr_grow (&argv_obstack, NULL);
 875   const char **new_argv = XOBFINISH (&argv_obstack, const char **);
 876
 877   char *execpath = getenv ("GCC_EXEC_PREFIX");
 878   char *cpath = getenv ("COMPILER_PATH");
 879   char *lpath = getenv ("LIBRARY_PATH");
 880   unsetenv ("GCC_EXEC_PREFIX");
 881   unsetenv ("COMPILER_PATH");
 882   unsetenv ("LIBRARY_PATH");
 883
 884   fork_execute (new_argv[0], CONST_CAST (char **, new_argv), true);
 885   obstack_free (&argv_obstack, NULL);
 886
 887   xputenv (concat ("GCC_EXEC_PREFIX=", execpath, NULL));
 888   xputenv (concat ("COMPILER_PATH=", cpath, NULL));
 889   xputenv (concat ("LIBRARY_PATH=", lpath, NULL));
 890
 891   in = fopen (ptx_name, "r");
 892   if (!in)
 893     fatal_error (input_location, "cannot open intermediate ptx file");
 894
 895   ptx_cfile_name = make_temp_file (".c");
 896
 897   out = fopen (ptx_cfile_name, "w");
 898   if (!out)
 899     fatal_error (input_location, "cannot open '%s'", ptx_cfile_name);
 900
 901   process (in, out);
 902   fclose (out);
 903
 904   compile_native (ptx_cfile_name, outname, collect_gcc);
 905
 906   utils_cleanup (false);
 907
 908   return 0;
 909 }