Return to genextract.c CVS log

Up to [GCC 2.x] / gcc

Annotation of gcc/genextract.c, revision 1.1

1.1     ! root        1: /* Generate code from machine description to extract operands from insn as rtl.
        !             2:    Copyright (C) 1987, 1991 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 2, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GNU CC is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: 
        !            21: #include <stdio.h>
        !            22: #include "config.h"
        !            23: #include "rtl.h"
        !            24: #include "obstack.h"
        !            25: 
        !            26: static struct obstack obstack;
        !            27: struct obstack *rtl_obstack = &obstack;
        !            28: 
        !            29: #define obstack_chunk_alloc xmalloc
        !            30: #define obstack_chunk_free free
        !            31: 
        !            32: extern void free ();
        !            33: 
        !            34: /* Number instruction patterns handled, starting at 0 for first one.  */
        !            35: 
        !            36: static int insn_code_number;
        !            37: 
        !            38: /* Number the occurrences of MATCH_DUP in each instruction,
        !            39:    starting at 0 for the first occurrence.  */
        !            40: 
        !            41: static int dup_count;
        !            42: 
        !            43: /* Record which operand numbers have been seen in the current pattern.
        !            44:    This table is made longer as needed.  */
        !            45: 
        !            46: static char *operand_seen;
        !            47: 
        !            48: /* Current allocated length of operand_seen.  */
        !            49: 
        !            50: static int operand_seen_length;
        !            51: 
        !            52: /* Have we got any peephole patterns yet?  */
        !            53: 
        !            54: static int peephole_seen;
        !            55: 
        !            56: /* While tree-walking an instruction pattern, we keep a chain
        !            57:    of these `struct link's to record how to get down to the
        !            58:    current position.  In each one, POS is the operand number,
        !            59:    and if the operand is a vector VEC is the element number.
        !            60:    VEC is -1 if the operand is not a vector.  */
        !            61: 
        !            62: struct link
        !            63: {
        !            64:   struct link *next;
        !            65:   int pos;
        !            66:   int vecelt;
        !            67: };
        !            68: 
        !            69: static void walk_rtx ();
        !            70: static void print_path ();
        !            71: char *xmalloc ();
        !            72: char *xrealloc ();
        !            73: static void fatal ();
        !            74: void fancy_abort ();
        !            75: 
        !            76: static void
        !            77: gen_insn (insn)
        !            78:      rtx insn;
        !            79: {
        !            80:   register int i;
        !            81: 
        !            82:   dup_count = 0;
        !            83: 
        !            84:   /* No operands seen so far in this pattern.  */
        !            85:   bzero (operand_seen, operand_seen_length);
        !            86: 
        !            87:   printf ("    case %d:\n", insn_code_number);
        !            88: 
        !            89:   /* Walk the insn's pattern, remembering at all times the path
        !            90:      down to the walking point.  */
        !            91: 
        !            92:   if (XVECLEN (insn, 1) == 1)
        !            93:     walk_rtx (XVECEXP (insn, 1, 0), 0);
        !            94:   else
        !            95:     for (i = XVECLEN (insn, 1) - 1; i >= 0; i--)
        !            96:       {
        !            97:        struct link link;
        !            98:        link.next = 0;
        !            99:        link.pos = 0;
        !           100:        link.vecelt = i;
        !           101:        walk_rtx (XVECEXP (insn, 1, i), &link);
        !           102:       }
        !           103: 
        !           104:   /* If the operand numbers used in the pattern are not consecutive,
        !           105:      don't leave an operand uninitialized.  */
        !           106:   for (i = operand_seen_length - 1; i >= 0; i--)
        !           107:     if (operand_seen[i])
        !           108:       break;
        !           109:   for (; i >= 0; i--)
        !           110:     if (!operand_seen[i])
        !           111:       {
        !           112:        printf ("      recog_operand[%d] = const0_rtx;\n", i);
        !           113:        printf ("      recog_operand_loc[%d] = &junk;\n", i);
        !           114:       }
        !           115:   printf ("      break;\n");
        !           116: }
        !           117: 
        !           118: /* Record that we have seen an operand with number OPNO in this pattern.  */
        !           119: 
        !           120: static void
        !           121: mark_operand_seen (opno)
        !           122:      int opno;
        !           123: {
        !           124:   if (opno >= operand_seen_length)
        !           125:     {
        !           126:       operand_seen_length *= 2;
        !           127:       operand_seen = (char *) xrealloc (operand_seen_length);
        !           128:     }
        !           129: 
        !           130:   operand_seen[opno] = 1;
        !           131: }
        !           132: 
        !           133: static void
        !           134: walk_rtx (x, path)
        !           135:      rtx x;
        !           136:      struct link *path;
        !           137: {
        !           138:   register RTX_CODE code;
        !           139:   register int i;
        !           140:   register int len;
        !           141:   register char *fmt;
        !           142:   struct link link;
        !           143: 
        !           144:   if (x == 0)
        !           145:     return;
        !           146: 
        !           147:   code = GET_CODE (x);
        !           148: 
        !           149:   switch (code)
        !           150:     {
        !           151:     case PC:
        !           152:     case CC0:
        !           153:     case CONST_INT:
        !           154:     case SYMBOL_REF:
        !           155:       return;
        !           156: 
        !           157:     case MATCH_OPERAND:
        !           158:     case MATCH_SCRATCH:
        !           159:       mark_operand_seen (XINT (x, 0));
        !           160:       printf ("      recog_operand[%d] = *(recog_operand_loc[%d]\n        = &",
        !           161:              XINT (x, 0), XINT (x, 0));
        !           162:       print_path (path);
        !           163:       printf (");\n");
        !           164:       break;
        !           165: 
        !           166:     case MATCH_DUP:
        !           167:     case MATCH_OP_DUP:
        !           168:       printf ("      recog_dup_loc[%d] = &", dup_count);
        !           169:       print_path (path);
        !           170:       printf (";\n");
        !           171:       printf ("      recog_dup_num[%d] = %d;\n", dup_count, XINT (x, 0));
        !           172:       dup_count++;
        !           173:       break;
        !           174: 
        !           175:     case MATCH_OPERATOR:
        !           176:       mark_operand_seen (XINT (x, 0));
        !           177:       printf ("      recog_operand[%d] = *(recog_operand_loc[%d]\n        = &",
        !           178:              XINT (x, 0), XINT (x, 0));
        !           179:       print_path (path);
        !           180:       printf (");\n");
        !           181:       link.next = path;
        !           182:       link.vecelt = -1;
        !           183:       for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
        !           184:        {
        !           185:          link.pos = i;
        !           186:          walk_rtx (XVECEXP (x, 2, i), &link);
        !           187:        }
        !           188:       return;
        !           189: 
        !           190:     case MATCH_PARALLEL:
        !           191:       mark_operand_seen (XINT (x, 0));
        !           192:       printf ("      recog_operand[%d] = *(recog_operand_loc[%d]\n        = &",
        !           193:              XINT (x, 0), XINT (x, 0));
        !           194:       print_path (path);
        !           195:       printf (");\n");
        !           196:       link.next = path;
        !           197:       link.pos = 0;
        !           198:       for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
        !           199:        {
        !           200:          link.vecelt = i;
        !           201:          walk_rtx (XVECEXP (x, 2, i), &link);
        !           202:        }
        !           203:       return;
        !           204: 
        !           205:     case ADDRESS:
        !           206:       walk_rtx (XEXP (x, 0), path);
        !           207:       return;
        !           208:     }
        !           209: 
        !           210:   link.next = path;
        !           211:   link.vecelt = -1;
        !           212:   fmt = GET_RTX_FORMAT (code);
        !           213:   len = GET_RTX_LENGTH (code);
        !           214:   for (i = 0; i < len; i++)
        !           215:     {
        !           216:       link.pos = i;
        !           217:       if (fmt[i] == 'e' || fmt[i] == 'u')
        !           218:        {
        !           219:          walk_rtx (XEXP (x, i), &link);
        !           220:        }
        !           221:       else if (fmt[i] == 'E')
        !           222:        {
        !           223:          int j;
        !           224:          for (j = XVECLEN (x, i) - 1; j >= 0; j--)
        !           225:            {
        !           226:              link.vecelt = j;
        !           227:              walk_rtx (XVECEXP (x, i, j), &link);
        !           228:            }
        !           229:        }
        !           230:     }
        !           231: }
        !           232: 
        !           233: /* Given a PATH, representing a path down the instruction's
        !           234:    pattern from the root to a certain point, output code to
        !           235:    evaluate to the rtx at that point.  */
        !           236: 
        !           237: static void
        !           238: print_path (path)
        !           239:      struct link *path;
        !           240: {
        !           241:   if (path == 0)
        !           242:     printf ("insn");
        !           243:   else if (path->vecelt >= 0)
        !           244:     {
        !           245:       printf ("XVECEXP (");
        !           246:       print_path (path->next);
        !           247:       printf (", %d, %d)", path->pos, path->vecelt);
        !           248:     }
        !           249:   else
        !           250:     {
        !           251:       printf ("XEXP (");
        !           252:       print_path (path->next);
        !           253:       printf (", %d)", path->pos);
        !           254:     }
        !           255: }
        !           256: 
        !           257: char *
        !           258: xmalloc (size)
        !           259:      unsigned size;
        !           260: {
        !           261:   register char *val = (char *) malloc (size);
        !           262: 
        !           263:   if (val == 0)
        !           264:     fatal ("virtual memory exhausted");
        !           265:   return val;
        !           266: }
        !           267: 
        !           268: char *
        !           269: xrealloc (ptr, size)
        !           270:      char *ptr;
        !           271:      unsigned size;
        !           272: {
        !           273:   char *result = (char *) realloc (ptr, size);
        !           274:   if (!result)
        !           275:     fatal ("virtual memory exhausted");
        !           276:   return result;
        !           277: }
        !           278: 
        !           279: static void
        !           280: fatal (s, a1, a2)
        !           281:      char *s;
        !           282: {
        !           283:   fprintf (stderr, "genextract: ");
        !           284:   fprintf (stderr, s, a1, a2);
        !           285:   fprintf (stderr, "\n");
        !           286:   exit (FATAL_EXIT_CODE);
        !           287: }
        !           288: 
        !           289: /* More 'friendly' abort that prints the line and file.
        !           290:    config.h can #define abort fancy_abort if you like that sort of thing.  */
        !           291: 
        !           292: void
        !           293: fancy_abort ()
        !           294: {
        !           295:   fatal ("Internal gcc abort.");
        !           296: }
        !           297: 
        !           298: int
        !           299: main (argc, argv)
        !           300:      int argc;
        !           301:      char **argv;
        !           302: {
        !           303:   rtx desc;
        !           304:   FILE *infile;
        !           305:   extern rtx read_rtx ();
        !           306:   register int c, i;
        !           307: 
        !           308:   obstack_init (rtl_obstack);
        !           309: 
        !           310:   if (argc <= 1)
        !           311:     fatal ("No input file name.");
        !           312: 
        !           313:   infile = fopen (argv[1], "r");
        !           314:   if (infile == 0)
        !           315:     {
        !           316:       perror (argv[1]);
        !           317:       exit (FATAL_EXIT_CODE);
        !           318:     }
        !           319: 
        !           320:   init_rtl ();
        !           321: 
        !           322:   /* Assign sequential codes to all entries in the machine description
        !           323:      in parallel with the tables in insn-output.c.  */
        !           324: 
        !           325:   insn_code_number = 0;
        !           326: 
        !           327:   operand_seen_length = 40;
        !           328:   operand_seen = (char *) xmalloc (40);
        !           329: 
        !           330:   printf ("/* Generated automatically by the program `genextract'\n\
        !           331: from the machine description file `md'.  */\n\n");
        !           332: 
        !           333:   printf ("#include \"config.h\"\n");
        !           334:   printf ("#include \"rtl.h\"\n\n");
        !           335: 
        !           336:   /* This variable exists only so it can be the "location"
        !           337:      of any missing operand whose numbers are skipped by a given pattern.  */
        !           338:   printf ("static rtx junk;\n");
        !           339:   printf ("extern rtx recog_operand[];\n");
        !           340:   printf ("extern rtx *recog_operand_loc[];\n");
        !           341:   printf ("extern rtx *recog_dup_loc[];\n");
        !           342:   printf ("extern char recog_dup_num[];\n");
        !           343:   printf ("extern void fatal_insn_not_found ();\n\n");
        !           344: 
        !           345:   printf ("void\ninsn_extract (insn)\n");
        !           346:   printf ("     rtx insn;\n");
        !           347:   printf ("{\n");
        !           348:   printf ("  int insn_code = INSN_CODE (insn);\n");
        !           349:   printf ("  if (insn_code == -1) fatal_insn_not_found (insn);\n");
        !           350:   printf ("  insn = PATTERN (insn);\n");
        !           351:   printf ("  switch (insn_code)\n");
        !           352:   printf ("    {\n");
        !           353: 
        !           354:   /* Read the machine description.  */
        !           355: 
        !           356:   while (1)
        !           357:     {
        !           358:       c = read_skip_spaces (infile);
        !           359:       if (c == EOF)
        !           360:        break;
        !           361:       ungetc (c, infile);
        !           362: 
        !           363:       desc = read_rtx (infile);
        !           364:       if (GET_CODE (desc) == DEFINE_INSN)
        !           365:        {
        !           366:          gen_insn (desc);
        !           367:          ++insn_code_number;
        !           368:        }
        !           369:       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
        !           370:        {
        !           371:          printf ("    case %d: goto peephole;\n", insn_code_number);
        !           372:          ++insn_code_number;
        !           373:          ++peephole_seen;
        !           374:        }
        !           375:       if (GET_CODE (desc) == DEFINE_EXPAND || GET_CODE (desc) == DEFINE_SPLIT)
        !           376:        {
        !           377:          printf ("    case %d: break;\n", insn_code_number);
        !           378:          ++insn_code_number;
        !           379:        }
        !           380:     }
        !           381: 
        !           382:   /* This should never be reached.  */
        !           383:   printf ("\n    default:\n      abort ();\n");
        !           384: 
        !           385:   if (peephole_seen)
        !           386:     {
        !           387:       /* The vector in the insn says how many operands it has.
        !           388:         And all it contains are operands.  In fact, the vector was
        !           389:         created just for the sake of this function.  */
        !           390:       printf ("    peephole:\n");
        !           391:       printf ("#if __GNUC__ > 1 && !defined (bcopy)\n");
        !           392:       printf ("#define bcopy(FROM,TO,COUNT) __builtin_memcpy(TO,FROM,COUNT)\n");
        !           393:       printf ("#endif\n");
        !           394:       printf ("      bcopy (&XVECEXP (insn, 0, 0), recog_operand,\n");
        !           395:       printf ("             sizeof (rtx) * XVECLEN (insn, 0));\n");
        !           396:       printf ("      break;\n");
        !           397:     }
        !           398: 
        !           399:   printf ("    }\n}\n");
        !           400: 
        !           401:   fflush (stdout);
        !           402:   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
        !           403:   /* NOTREACHED */
        !           404:   return 0;
        !           405: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.