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Diffstat (limited to 'gcc-1.40/genconfig.c')
| -rw-r--r-- | gcc-1.40/genconfig.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/gcc-1.40/genconfig.c b/gcc-1.40/genconfig.c new file mode 100644 index 0000000..cb152ac --- /dev/null +++ b/gcc-1.40/genconfig.c @@ -0,0 +1,267 @@ +/* Generate from machine description: + + - some #define configuration flags. + Copyright (C) 1987 Free Software Foundation, Inc. + +This file is part of GNU CC. + +GNU CC is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 1, or (at your option) +any later version. + +GNU CC is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU CC; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + + +#include <stdio.h> +#include "config.h" +#include "rtl.h" +#include "obstack.h" + +struct obstack obstack; +struct obstack *rtl_obstack = &obstack; + +#define obstack_chunk_alloc xmalloc +#define obstack_chunk_free free +extern int xmalloc (); +extern void free (); + +/* flags to determine output of machine description dependent #define's. */ +int max_recog_operands_flag; +int max_dup_operands_flag; +int max_clobbers_per_insn_flag; +int register_constraint_flag; + +int clobbers_seen_this_insn; +int dup_operands_seen_this_insn; + +void fatal (); +void fancy_abort (); + +void +walk_insn_part (part) + rtx part; +{ + register int i, j; + register RTX_CODE code; + register char *format_ptr; + + if (part == 0) + return; + + code = GET_CODE (part); + switch (code) + { + case CLOBBER: + clobbers_seen_this_insn++; + break; + + case MATCH_OPERAND: + if (XINT (part, 0) > max_recog_operands_flag) + max_recog_operands_flag = XINT (part, 0); + if (XSTR (part, 2) && *XSTR (part, 2)) + register_constraint_flag = 1; + return; + + case MATCH_OPERATOR: + if (XINT (part, 0) > max_recog_operands_flag) + max_recog_operands_flag = XINT (part, 0); + /* Now scan the rtl'x in the vector inside the match_operator. */ + break; + + case LABEL_REF: + if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND) + break; + return; + + case MATCH_DUP: + ++dup_operands_seen_this_insn; + if (XINT (part, 0) > max_recog_operands_flag) + max_recog_operands_flag = XINT (part, 0); + + case REG: case CONST_INT: case SYMBOL_REF: + case PC: case CC0: + return; + } + + format_ptr = GET_RTX_FORMAT (GET_CODE (part)); + + for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++) + switch (*format_ptr++) + { + case 'e': + case 'u': + walk_insn_part (XEXP (part, i)); + break; + case 'E': + if (XVEC (part, i) != NULL) + for (j = 0; j < XVECLEN (part, i); j++) + walk_insn_part (XVECEXP (part, i, j)); + break; + } +} + +void +gen_insn (insn) + rtx insn; +{ + int i; + + /* Walk the insn pattern to gather the #define's status. */ + clobbers_seen_this_insn = 0; + dup_operands_seen_this_insn = 0; + if (XVEC (insn, 1) != 0) + for (i = 0; i < XVECLEN (insn, 1); i++) + walk_insn_part (XVECEXP (insn, 1, i)); + + if (clobbers_seen_this_insn > max_clobbers_per_insn_flag) + max_clobbers_per_insn_flag = clobbers_seen_this_insn; + if (dup_operands_seen_this_insn > max_dup_operands_flag) + max_dup_operands_flag = dup_operands_seen_this_insn; +} + +/* Similar but scan a define_expand. */ + +void +gen_expand (insn) + rtx insn; +{ + int i; + + /* Walk the insn pattern to gather the #define's status. */ + + /* Note that we don't bother recording the number of MATCH_DUPs + that occur in a gen_expand, because only reload cares about that. */ + if (XVEC (insn, 1) != 0) + for (i = 0; i < XVECLEN (insn, 1); i++) + { + /* Compute the maximum SETs and CLOBBERS + in any one of the sub-insns; + don't sum across all of them. */ + clobbers_seen_this_insn = 0; + + walk_insn_part (XVECEXP (insn, 1, i)); + + if (clobbers_seen_this_insn > max_clobbers_per_insn_flag) + max_clobbers_per_insn_flag = clobbers_seen_this_insn; + } +} + +void +gen_peephole (peep) + rtx peep; +{ + int i; + + /* Look through the patterns that are matched + to compute the maximum operand number. */ + for (i = 0; i < XVECLEN (peep, 0); i++) + walk_insn_part (XVECEXP (peep, 0, i)); +} + +int +xmalloc (size) +{ + register int val = malloc (size); + + if (val == 0) + fatal ("virtual memory exhausted"); + + return val; +} + +int +xrealloc (ptr, size) + char *ptr; + int size; +{ + int result = realloc (ptr, size); + if (!result) + fatal ("virtual memory exhausted"); + return result; +} + +void +fatal (s, a1, a2) + char *s; +{ + fprintf (stderr, "genconfig: "); + fprintf (stderr, s, a1, a2); + fprintf (stderr, "\n"); + exit (FATAL_EXIT_CODE); +} + +/* More 'friendly' abort that prints the line and file. + config.h can #define abort fancy_abort if you like that sort of thing. */ + +void +fancy_abort () +{ + fatal ("Internal gcc abort."); +} + +int +main (argc, argv) + int argc; + char **argv; +{ + rtx desc; + FILE *infile; + extern rtx read_rtx (); + register int c; + + obstack_init (rtl_obstack); + + if (argc <= 1) + fatal ("No input file name."); + + infile = fopen (argv[1], "r"); + if (infile == 0) + { + perror (argv[1]); + exit (FATAL_EXIT_CODE); + } + + init_rtl (); + + printf ("/* Generated automatically by the program `genconfig'\n\ +from the machine description file `md'. */\n\n"); + + /* Read the machine description. */ + + while (1) + { + c = read_skip_spaces (infile); + if (c == EOF) + break; + ungetc (c, infile); + + desc = read_rtx (infile); + if (GET_CODE (desc) == DEFINE_INSN) + gen_insn (desc); + if (GET_CODE (desc) == DEFINE_EXPAND) + gen_expand (desc); + if (GET_CODE (desc) == DEFINE_PEEPHOLE) + gen_peephole (desc); + } + + /* 3 more than needed for this md file, for the sake of asm constructs. */ + printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands_flag + 4); + + if (max_dup_operands_flag == 0) + max_dup_operands_flag = 1; + printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands_flag); + + if (register_constraint_flag) + printf ("#define REGISTER_CONSTRAINTS\n"); + + fflush (stdout); + exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); +} |