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author | Richard Kenner <kenner@gcc.gnu.org> | 1991-11-03 09:27:47 -0500 |
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committer | Richard Kenner <kenner@gcc.gnu.org> | 1991-11-03 09:27:47 -0500 |
commit | aabf90e8ce80ca78708982eee04b776682e2aeb3 (patch) | |
tree | f4ad612dd5acea07657baf95c20b2ac4980aa4b6 /gcc/genconfig.c | |
parent | 9789a53f20c8b8a0712877967e7a58910442a077 (diff) | |
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Initial revision
From-SVN: r53
Diffstat (limited to 'gcc/genconfig.c')
-rw-r--r-- | gcc/genconfig.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/gcc/genconfig.c b/gcc/genconfig.c new file mode 100644 index 0000000..f49ad75 --- /dev/null +++ b/gcc/genconfig.c @@ -0,0 +1,326 @@ +/* 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 2, 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" + +static struct obstack obstack; +struct obstack *rtl_obstack = &obstack; + +#define obstack_chunk_alloc xmalloc +#define obstack_chunk_free free + +extern void free (); + +/* flags to determine output of machine description dependent #define's. */ +static int max_recog_operands; +static int max_dup_operands; +static int max_clobbers_per_insn; +static int register_constraint_flag; +static int have_cc0_flag; +static int have_lo_sum_flag; + +/* Maximum number of insns seen in a split. */ +static int max_insns_per_split = 1; + +static int clobbers_seen_this_insn; +static int dup_operands_seen_this_insn; + +char *xmalloc (); +static void fatal (); +void fancy_abort (); + +/* RECOG_P will be non-zero if this pattern was seen in a context where it will + be used to recognize, rather than just generate an insn. */ + +static void +walk_insn_part (part, recog_p) + 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) + max_recog_operands = XINT (part, 0); + if (XSTR (part, 2) && *XSTR (part, 2)) + register_constraint_flag = 1; + return; + + case MATCH_OP_DUP: + ++dup_operands_seen_this_insn; + case MATCH_SCRATCH: + case MATCH_PARALLEL: + case MATCH_OPERATOR: + if (XINT (part, 0) > max_recog_operands) + max_recog_operands = XINT (part, 0); + /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or + MATCH_PARALLEL. */ + 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) + max_recog_operands = XINT (part, 0); + return; + + case CC0: + if (recog_p) + have_cc0_flag = 1; + return; + + case LO_SUM: + if (recog_p) + have_lo_sum_flag = 1; + return; + + case REG: case CONST_INT: case SYMBOL_REF: + case PC: + 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), recog_p); + break; + case 'E': + if (XVEC (part, i) != NULL) + for (j = 0; j < XVECLEN (part, i); j++) + walk_insn_part (XVECEXP (part, i, j), recog_p); + break; + } +} + +static 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), 1); + + if (clobbers_seen_this_insn > max_clobbers_per_insn) + max_clobbers_per_insn = clobbers_seen_this_insn; + if (dup_operands_seen_this_insn > max_dup_operands) + max_dup_operands = dup_operands_seen_this_insn; +} + +/* Similar but scan a define_expand. */ + +static 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), 0); + + if (clobbers_seen_this_insn > max_clobbers_per_insn) + max_clobbers_per_insn = clobbers_seen_this_insn; + } +} + +/* Similar but scan a define_split. */ + +static void +gen_split (split) + rtx split; +{ + int i; + + /* Look through the patterns that are matched + to compute the maximum operand number. */ + for (i = 0; i < XVECLEN (split, 0); i++) + walk_insn_part (XVECEXP (split, 0, i), 1); + /* Look at the number of insns this insn could split into. */ + if (XVECLEN (split, 2) > max_insns_per_split) + max_insns_per_split = XVECLEN (split, 2); +} + +static 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), 1); +} + +char * +xmalloc (size) + unsigned size; +{ + register char *val = (char *) malloc (size); + + if (val == 0) + fatal ("virtual memory exhausted"); + + return val; +} + +char * +xrealloc (ptr, size) + char *ptr; + unsigned size; +{ + char *result = (char *) realloc (ptr, size); + if (!result) + fatal ("virtual memory exhausted"); + return result; +} + +static 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"); + + /* Allow at least 10 operands for the sake of asm constructs. */ + max_recog_operands = 10; + max_dup_operands = 1; + + /* 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_SPLIT) + gen_split (desc); + if (GET_CODE (desc) == DEFINE_PEEPHOLE) + gen_peephole (desc); + } + + printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands); + + printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands); + + /* This is conditionally defined, in case the user writes code which emits + more splits than we can readily see (and knows s/he does it). */ + printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n", + max_insns_per_split); + + if (register_constraint_flag) + printf ("#define REGISTER_CONSTRAINTS\n"); + + if (have_cc0_flag) + printf ("#define HAVE_cc0\n"); + + if (have_lo_sum_flag) + printf ("#define HAVE_lo_sum\n"); + + fflush (stdout); + exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); + /* NOTREACHED */ + return 0; +} |