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Annotation of gcc/genattr.c, revision 1.1

1.1     ! root        1: /* Generate attribute information (insn-attr.h) from machine description.
        !             2:    Copyright (C) 1991 Free Software Foundation, Inc.
        !             3:    Contributed by Richard Kenner ([email protected])
        !             4: 
        !             5: This file is part of GNU CC.
        !             6: 
        !             7: GNU CC is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU General Public License as published by
        !             9: the Free Software Foundation; either version 2, or (at your option)
        !            10: any later version.
        !            11: 
        !            12: GNU CC is distributed in the hope that it will be useful,
        !            13: but 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 GNU CC; see the file COPYING.  If not, write to
        !            19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            20: 
        !            21: 
        !            22: #include <stdio.h>
        !            23: #include "config.h"
        !            24: #include "rtl.h"
        !            25: #include "obstack.h"
        !            26: 
        !            27: static struct obstack obstack;
        !            28: struct obstack *rtl_obstack = &obstack;
        !            29: 
        !            30: #define obstack_chunk_alloc xmalloc
        !            31: #define obstack_chunk_free free
        !            32: 
        !            33: extern void free ();
        !            34: extern int atoi ();
        !            35: 
        !            36: char *xmalloc ();
        !            37: static void fatal ();
        !            38: void fancy_abort ();
        !            39: 
        !            40: static void
        !            41: write_upcase (str)
        !            42:     char *str;
        !            43: {
        !            44:   for (; *str; str++)
        !            45:     if (*str >= 'a' && *str <= 'z')
        !            46:       printf ("%c", *str - 'a' + 'A');
        !            47:     else
        !            48:       printf ("%c", *str);
        !            49: }
        !            50: 
        !            51: static void
        !            52: gen_attr (attr)
        !            53:      rtx attr;
        !            54: {
        !            55:   char *p;
        !            56: 
        !            57:   printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
        !            58: 
        !            59:   /* If numeric attribute, don't need to write an enum.  */
        !            60:   if (*XSTR (attr, 1) == '\0')
        !            61:     printf ("extern int get_attr_%s ();\n", XSTR (attr, 0));
        !            62:   else
        !            63:     {
        !            64:       printf ("enum attr_%s {", XSTR (attr, 0));
        !            65:       write_upcase (XSTR (attr, 0));
        !            66:       printf ("_");
        !            67: 
        !            68:       for (p = XSTR (attr, 1); *p != '\0'; p++)
        !            69:        {
        !            70:          if (*p == ',')
        !            71:            {
        !            72:              printf (", ");
        !            73:              write_upcase (XSTR (attr, 0));
        !            74:              printf ("_");
        !            75:            }
        !            76:          else if (*p >= 'a' && *p <= 'z')
        !            77:            printf ("%c", *p - 'a' + 'A');
        !            78:          else
        !            79:            printf ("%c", *p);
        !            80:        }
        !            81: 
        !            82:       printf ("};\n");
        !            83:       printf ("extern enum attr_%s get_attr_%s ();\n\n",
        !            84:              XSTR (attr, 0), XSTR (attr, 0));
        !            85:     }
        !            86: 
        !            87:   /* If `length' attribute, write additional function definitions and define
        !            88:      variables used by `insn_current_length'.  */
        !            89:   if (! strcmp (XSTR (attr, 0), "length"))
        !            90:     {
        !            91:       printf ("extern void init_lengths ();\n");
        !            92:       printf ("extern void shorten_branches ();\n");
        !            93:       printf ("extern int insn_default_length ();\n");
        !            94:       printf ("extern int insn_variable_length_p ();\n");
        !            95:       printf ("extern int insn_current_length ();\n\n");
        !            96:       printf ("extern int *insn_addresses;\n");
        !            97:       printf ("extern int insn_current_address;\n\n");
        !            98:     }
        !            99: }
        !           100: 
        !           101: static void
        !           102: write_units ()
        !           103: {
        !           104:   printf ("#define INSN_SCHEDULING\n\n");
        !           105:   printf ("extern int result_ready_cost ();\n");
        !           106:   printf ("extern int function_units_used ();\n\n");
        !           107:   printf ("extern struct function_unit_desc\n");
        !           108:   printf ("{\n");
        !           109:   printf ("  char *name;\n");
        !           110:   printf ("  int bitmask;\n");
        !           111:   printf ("  int multiplicity;\n");
        !           112:   printf ("  int simultaneity;\n");
        !           113:   printf ("  int default_cost;\n");
        !           114:   printf ("  int (*ready_cost_function) ();\n");
        !           115:   printf ("  int (*conflict_cost_function) ();\n");
        !           116:   printf ("} function_units[];\n\n");
        !           117: }
        !           118: 
        !           119: char *
        !           120: xmalloc (size)
        !           121:      unsigned size;
        !           122: {
        !           123:   register char *val = (char *) malloc (size);
        !           124: 
        !           125:   if (val == 0)
        !           126:     fatal ("virtual memory exhausted");
        !           127:   return val;
        !           128: }
        !           129: 
        !           130: char *
        !           131: xrealloc (ptr, size)
        !           132:      char *ptr;
        !           133:      unsigned size;
        !           134: {
        !           135:   char * result = (char *) realloc (ptr, size);
        !           136:   if (!result)
        !           137:     fatal ("virtual memory exhausted");
        !           138:   return result;
        !           139: }
        !           140: 
        !           141: static void
        !           142: fatal (s, a1, a2)
        !           143:      char *s;
        !           144: {
        !           145:   fprintf (stderr, "genattr: ");
        !           146:   fprintf (stderr, s, a1, a2);
        !           147:   fprintf (stderr, "\n");
        !           148:   exit (FATAL_EXIT_CODE);
        !           149: }
        !           150: 
        !           151: /* More 'friendly' abort that prints the line and file.
        !           152:    config.h can #define abort fancy_abort if you like that sort of thing.  */
        !           153: 
        !           154: void
        !           155: fancy_abort ()
        !           156: {
        !           157:   fatal ("Internal gcc abort.");
        !           158: }
        !           159: 
        !           160: int
        !           161: main (argc, argv)
        !           162:      int argc;
        !           163:      char **argv;
        !           164: {
        !           165:   rtx desc;
        !           166:   FILE *infile;
        !           167:   extern rtx read_rtx ();
        !           168:   register int c;
        !           169:   int have_delay = 0;
        !           170:   int have_annul_true = 0;
        !           171:   int have_annul_false = 0;
        !           172:   int have_units = 0;
        !           173:   int i;
        !           174: 
        !           175:   obstack_init (rtl_obstack);
        !           176: 
        !           177:   if (argc <= 1)
        !           178:     fatal ("No input file name.");
        !           179: 
        !           180:   infile = fopen (argv[1], "r");
        !           181:   if (infile == 0)
        !           182:     {
        !           183:       perror (argv[1]);
        !           184:       exit (FATAL_EXIT_CODE);
        !           185:     }
        !           186: 
        !           187:   init_rtl ();
        !           188: 
        !           189:   printf ("/* Generated automatically by the program `genattr'\n\
        !           190: from the machine description file `md'.  */\n\n");
        !           191: 
        !           192:   /* For compatibility, define the attribute `alternative', which is just
        !           193:      a reference to the variable `which_alternative'.  */
        !           194: 
        !           195:   printf ("#define HAVE_ATTR_alternative\n");
        !           196:   printf ("#define get_attr_alternative(insn) which_alternative\n");
        !           197:      
        !           198:   /* Read the machine description.  */
        !           199: 
        !           200:   while (1)
        !           201:     {
        !           202:       c = read_skip_spaces (infile);
        !           203:       if (c == EOF)
        !           204:        break;
        !           205:       ungetc (c, infile);
        !           206: 
        !           207:       desc = read_rtx (infile);
        !           208:       if (GET_CODE (desc) == DEFINE_ATTR)
        !           209:        gen_attr (desc);
        !           210: 
        !           211:       else if (GET_CODE (desc) == DEFINE_DELAY)
        !           212:         {
        !           213:          if (! have_delay)
        !           214:            {
        !           215:              printf ("#define DELAY_SLOTS\n");
        !           216:              printf ("extern int num_delay_slots ();\n");
        !           217:              printf ("extern int eligible_for_delay ();\n\n");
        !           218:              have_delay = 1;
        !           219:            }
        !           220: 
        !           221:          for (i = 0; i < XVECLEN (desc, 1); i += 3)
        !           222:            {
        !           223:              if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
        !           224:                {
        !           225:                  printf ("#define ANNUL_IFTRUE_SLOTS\n");
        !           226:                  printf ("extern int eligible_for_annul_true ();\n");
        !           227:                  have_annul_true = 1;
        !           228:                }
        !           229: 
        !           230:              if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
        !           231:                {
        !           232:                  printf ("#define ANNUL_IFFALSE_SLOTS\n");
        !           233:                  printf ("extern int eligible_for_annul_false ();\n");
        !           234:                  have_annul_false = 1;
        !           235:                }
        !           236:            }
        !           237:         }
        !           238: 
        !           239:       else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT && ! have_units)
        !           240:        {
        !           241:          have_units = 1;
        !           242:          write_units ();
        !           243:        }
        !           244:     }
        !           245: 
        !           246:   fflush (stdout);
        !           247:   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
        !           248:   /* NOTREACHED */
        !           249:   return 0;
        !           250: }
        !           251: 

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