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Annotation of GNUtools/cc/genconfig.c, revision 1.1

1.1     ! root        1: /* Generate from machine description:
        !             2: 
        !             3:    - some #define configuration flags.
        !             4:    Copyright (C) 1987, 1991 Free Software Foundation, Inc.
        !             5: 
        !             6: This file is part of GNU CC.
        !             7: 
        !             8: GNU CC is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU General Public License as published by
        !            10: the Free Software Foundation; either version 2, or (at your option)
        !            11: any later version.
        !            12: 
        !            13: GNU CC is distributed in the hope that it will be useful,
        !            14: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            16: GNU General Public License for more details.
        !            17: 
        !            18: You should have received a copy of the GNU General Public License
        !            19: along with GNU CC; see the file COPYING.  If not, write to
        !            20: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            21: 
        !            22: 
        !            23: #include <stdio.h>
        !            24: #include "hconfig.h"
        !            25: #include "rtl.h"
        !            26: #include "obstack.h"
        !            27: 
        !            28: static struct obstack obstack;
        !            29: struct obstack *rtl_obstack = &obstack;
        !            30: 
        !            31: #define obstack_chunk_alloc xmalloc
        !            32: #define obstack_chunk_free free
        !            33: 
        !            34: extern void free ();
        !            35: extern rtx read_rtx ();
        !            36: 
        !            37: /* flags to determine output of machine description dependent #define's.  */
        !            38: static int max_recog_operands;  /* Largest operand number seen.  */
        !            39: static int max_dup_operands;    /* Largest number of match_dup in any insn.  */
        !            40: static int max_clobbers_per_insn;
        !            41: static int register_constraint_flag;
        !            42: static int have_cc0_flag;
        !            43: static int have_cmove_flag;
        !            44: static int have_lo_sum_flag;
        !            45: 
        !            46: /* Maximum number of insns seen in a split.  */
        !            47: static int max_insns_per_split = 1;
        !            48: 
        !            49: static int clobbers_seen_this_insn;
        !            50: static int dup_operands_seen_this_insn;
        !            51: 
        !            52: char *xmalloc ();
        !            53: static void fatal ();
        !            54: void fancy_abort ();
        !            55: 
        !            56: /* RECOG_P will be non-zero if this pattern was seen in a context where it will
        !            57:    be used to recognize, rather than just generate an insn. 
        !            58: 
        !            59:    NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
        !            60:    of a SET whose destination is not (pc).  */
        !            61: 
        !            62: static void
        !            63: walk_insn_part (part, recog_p, non_pc_set_src)
        !            64:      rtx part;
        !            65:      int recog_p;
        !            66:      int non_pc_set_src;
        !            67: {
        !            68:   register int i, j;
        !            69:   register RTX_CODE code;
        !            70:   register char *format_ptr;
        !            71: 
        !            72:   if (part == 0)
        !            73:     return;
        !            74: 
        !            75:   code = GET_CODE (part);
        !            76:   switch (code)
        !            77:     {
        !            78:     case CLOBBER:
        !            79:       clobbers_seen_this_insn++;
        !            80:       break;
        !            81: 
        !            82:     case MATCH_OPERAND:
        !            83:       if (XINT (part, 0) > max_recog_operands)
        !            84:        max_recog_operands = XINT (part, 0);
        !            85:       if (XSTR (part, 2) && *XSTR (part, 2))
        !            86:        register_constraint_flag = 1;
        !            87:       return;
        !            88: 
        !            89:     case MATCH_OP_DUP:
        !            90:     case MATCH_PAR_DUP:
        !            91:       ++dup_operands_seen_this_insn;
        !            92:     case MATCH_SCRATCH:
        !            93:     case MATCH_PARALLEL:
        !            94:     case MATCH_OPERATOR:
        !            95:       if (XINT (part, 0) > max_recog_operands)
        !            96:        max_recog_operands = XINT (part, 0);
        !            97:       /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
        !            98:         MATCH_PARALLEL.  */
        !            99:       break;
        !           100: 
        !           101:     case LABEL_REF:
        !           102:       if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
        !           103:        break;
        !           104:       return;
        !           105: 
        !           106:     case MATCH_DUP:
        !           107:       ++dup_operands_seen_this_insn;
        !           108:       if (XINT (part, 0) > max_recog_operands)
        !           109:        max_recog_operands = XINT (part, 0);
        !           110:       return;
        !           111: 
        !           112:     case CC0:
        !           113:       if (recog_p)
        !           114:        have_cc0_flag = 1;
        !           115:       return;
        !           116: 
        !           117:     case LO_SUM:
        !           118:       if (recog_p)
        !           119:        have_lo_sum_flag = 1;
        !           120:       return;
        !           121: 
        !           122:     case SET:
        !           123:       walk_insn_part (SET_DEST (part), 0, recog_p);
        !           124:       walk_insn_part (SET_SRC (part), recog_p,
        !           125:                      GET_CODE (SET_DEST (part)) != PC);
        !           126:       return;
        !           127: 
        !           128:     case IF_THEN_ELSE:
        !           129:       /* Only consider this machine as having a conditional move if the
        !           130:         two arms of the IF_THEN_ELSE are both MATCH_OPERAND.  Otherwise,
        !           131:         we have some specific IF_THEN_ELSE construct (like the doz
        !           132:         instruction on the RS/6000) that can't be used in the general
        !           133:         context we want it for.  */
        !           134: 
        !           135:       if (recog_p && non_pc_set_src
        !           136:          && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
        !           137:          && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
        !           138:        have_cmove_flag = 1;
        !           139:       break;
        !           140: 
        !           141:     case REG: case CONST_INT: case SYMBOL_REF:
        !           142:     case PC:
        !           143:       return;
        !           144:     }
        !           145: 
        !           146:   format_ptr = GET_RTX_FORMAT (GET_CODE (part));
        !           147: 
        !           148:   for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
        !           149:     switch (*format_ptr++)
        !           150:       {
        !           151:       case 'e':
        !           152:       case 'u':
        !           153:        walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
        !           154:        break;
        !           155:       case 'E':
        !           156:        if (XVEC (part, i) != NULL)
        !           157:          for (j = 0; j < XVECLEN (part, i); j++)
        !           158:            walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
        !           159:        break;
        !           160:       }
        !           161: }
        !           162: 
        !           163: static void
        !           164: gen_insn (insn)
        !           165:      rtx insn;
        !           166: {
        !           167:   int i;
        !           168: 
        !           169:   /* Walk the insn pattern to gather the #define's status.  */
        !           170:   clobbers_seen_this_insn = 0;
        !           171:   dup_operands_seen_this_insn = 0;
        !           172:   if (XVEC (insn, 1) != 0)
        !           173:     for (i = 0; i < XVECLEN (insn, 1); i++)
        !           174:       walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
        !           175: 
        !           176:   if (clobbers_seen_this_insn > max_clobbers_per_insn)
        !           177:     max_clobbers_per_insn = clobbers_seen_this_insn;
        !           178:   if (dup_operands_seen_this_insn > max_dup_operands)
        !           179:     max_dup_operands = dup_operands_seen_this_insn;
        !           180: }
        !           181: 
        !           182: /* Similar but scan a define_expand.  */
        !           183: 
        !           184: static void
        !           185: gen_expand (insn)
        !           186:      rtx insn;
        !           187: {
        !           188:   int i;
        !           189: 
        !           190:   /* Walk the insn pattern to gather the #define's status.  */
        !           191: 
        !           192:   /* Note that we don't bother recording the number of MATCH_DUPs
        !           193:      that occur in a gen_expand, because only reload cares about that.  */
        !           194:   if (XVEC (insn, 1) != 0)
        !           195:     for (i = 0; i < XVECLEN (insn, 1); i++)
        !           196:       {
        !           197:        /* Compute the maximum SETs and CLOBBERS
        !           198:           in any one of the sub-insns;
        !           199:           don't sum across all of them.  */
        !           200:        clobbers_seen_this_insn = 0;
        !           201: 
        !           202:        walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
        !           203: 
        !           204:        if (clobbers_seen_this_insn > max_clobbers_per_insn)
        !           205:          max_clobbers_per_insn = clobbers_seen_this_insn;
        !           206:       }
        !           207: }
        !           208: 
        !           209: /* Similar but scan a define_split.  */
        !           210: 
        !           211: static void
        !           212: gen_split (split)
        !           213:      rtx split;
        !           214: {
        !           215:   int i;
        !           216: 
        !           217:   /* Look through the patterns that are matched
        !           218:      to compute the maximum operand number.  */
        !           219:   for (i = 0; i < XVECLEN (split, 0); i++)
        !           220:     walk_insn_part (XVECEXP (split, 0, i), 1, 0);
        !           221:   /* Look at the number of insns this insn could split into.  */
        !           222:   if (XVECLEN (split, 2) > max_insns_per_split)
        !           223:     max_insns_per_split = XVECLEN (split, 2);
        !           224: }
        !           225: 
        !           226: static void
        !           227: gen_peephole (peep)
        !           228:      rtx peep;
        !           229: {
        !           230:   int i;
        !           231: 
        !           232:   /* Look through the patterns that are matched
        !           233:      to compute the maximum operand number.  */
        !           234:   for (i = 0; i < XVECLEN (peep, 0); i++)
        !           235:     walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
        !           236: }
        !           237: 
        !           238: char *
        !           239: xmalloc (size)
        !           240:      unsigned size;
        !           241: {
        !           242:   register char *val = (char *) malloc (size);
        !           243: 
        !           244:   if (val == 0)
        !           245:     fatal ("virtual memory exhausted");
        !           246: 
        !           247:   return val;
        !           248: }
        !           249: 
        !           250: char *
        !           251: xrealloc (ptr, size)
        !           252:      char *ptr;
        !           253:      unsigned size;
        !           254: {
        !           255:   char *result = (char *) realloc (ptr, size);
        !           256:   if (!result)
        !           257:     fatal ("virtual memory exhausted");
        !           258:   return result;
        !           259: }
        !           260: 
        !           261: static void
        !           262: fatal (s, a1, a2)
        !           263:      char *s;
        !           264: {
        !           265:   fprintf (stderr, "genconfig: ");
        !           266:   fprintf (stderr, s, a1, a2);
        !           267:   fprintf (stderr, "\n");
        !           268:   exit (FATAL_EXIT_CODE);
        !           269: }
        !           270: 
        !           271: /* More 'friendly' abort that prints the line and file.
        !           272:    config.h can #define abort fancy_abort if you like that sort of thing.  */
        !           273: 
        !           274: void
        !           275: fancy_abort ()
        !           276: {
        !           277:   fatal ("Internal gcc abort.");
        !           278: }
        !           279: 
        !           280: int
        !           281: main (argc, argv)
        !           282:      int argc;
        !           283:      char **argv;
        !           284: {
        !           285:   rtx desc;
        !           286:   FILE *infile;
        !           287:   register int c;
        !           288: 
        !           289:   obstack_init (rtl_obstack);
        !           290: 
        !           291:   if (argc <= 1)
        !           292:     fatal ("No input file name.");
        !           293: 
        !           294:   infile = fopen (argv[1], "r");
        !           295:   if (infile == 0)
        !           296:     {
        !           297:       perror (argv[1]);
        !           298:       exit (FATAL_EXIT_CODE);
        !           299:     }
        !           300: 
        !           301:   init_rtl ();
        !           302: 
        !           303:   printf ("/* Generated automatically by the program `genconfig'\n\
        !           304: from the machine description file `md'.  */\n\n");
        !           305: 
        !           306:   /* Allow at least 10 operands for the sake of asm constructs.  */
        !           307:   max_recog_operands = 9;  /* We will add 1 later.  */
        !           308:   max_dup_operands = 1;
        !           309: 
        !           310:   /* Read the machine description.  */
        !           311: 
        !           312:   while (1)
        !           313:     {
        !           314:       c = read_skip_spaces (infile);
        !           315:       if (c == EOF)
        !           316:        break;
        !           317:       ungetc (c, infile);
        !           318: 
        !           319:       desc = read_rtx (infile);
        !           320:       if (GET_CODE (desc) == DEFINE_INSN)
        !           321:        gen_insn (desc);
        !           322:       if (GET_CODE (desc) == DEFINE_EXPAND)
        !           323:        gen_expand (desc);
        !           324:       if (GET_CODE (desc) == DEFINE_SPLIT)
        !           325:        gen_split (desc);
        !           326:       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
        !           327:        gen_peephole (desc);
        !           328:     }
        !           329: 
        !           330:   printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
        !           331: 
        !           332:   printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
        !           333: 
        !           334:   /* This is conditionally defined, in case the user writes code which emits
        !           335:      more splits than we can readily see (and knows s/he does it).  */
        !           336:   printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
        !           337:          max_insns_per_split);
        !           338: 
        !           339:   if (register_constraint_flag)
        !           340:     printf ("#define REGISTER_CONSTRAINTS\n");
        !           341: 
        !           342:   if (have_cc0_flag)
        !           343:     printf ("#define HAVE_cc0\n");
        !           344: 
        !           345:   if (have_cmove_flag)
        !           346:     printf ("#define HAVE_conditional_move\n");
        !           347: 
        !           348:   if (have_lo_sum_flag)
        !           349:     printf ("#define HAVE_lo_sum\n");
        !           350: 
        !           351:   fflush (stdout);
        !           352:   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
        !           353:   /* NOTREACHED */
        !           354:   return 0;
        !           355: }

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