305 lines
7.2 KiB
C
305 lines
7.2 KiB
C
/* Generate from machine description:
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- some flags HAVE_... saying which simple standard instructions are
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available for this machine.
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Copyright (C) 1987, 1991, 1995, 1998,
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1999, 2000 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "hconfig.h"
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#include "system.h"
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#include "rtl.h"
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#include "obstack.h"
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#include "errors.h"
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#include "gensupport.h"
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/* Obstack to remember insns with. */
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static struct obstack obstack;
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/* Max size of names encountered. */
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static int max_id_len;
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/* Max operand encountered in a scan over some insn. */
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static int max_opno;
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static void max_operand_1 PARAMS ((rtx));
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static int num_operands PARAMS ((rtx));
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static void gen_proto PARAMS ((rtx));
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static void gen_macro PARAMS ((const char *, int, int));
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static void gen_insn PARAMS ((rtx));
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/* Count the number of match_operand's found. */
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static void
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max_operand_1 (x)
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rtx x;
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{
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RTX_CODE code;
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int i;
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int len;
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const char *fmt;
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if (x == 0)
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return;
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code = GET_CODE (x);
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if (code == MATCH_OPERAND || code == MATCH_OPERATOR
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|| code == MATCH_PARALLEL)
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max_opno = MAX (max_opno, XINT (x, 0));
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fmt = GET_RTX_FORMAT (code);
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len = GET_RTX_LENGTH (code);
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for (i = 0; i < len; i++)
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{
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if (fmt[i] == 'e' || fmt[i] == 'u')
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max_operand_1 (XEXP (x, i));
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else if (fmt[i] == 'E')
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{
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int j;
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for (j = 0; j < XVECLEN (x, i); j++)
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max_operand_1 (XVECEXP (x, i, j));
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}
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}
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}
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static int
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num_operands (insn)
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rtx insn;
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{
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int len = XVECLEN (insn, 1);
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int i;
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max_opno = -1;
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for (i = 0; i < len; i++)
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max_operand_1 (XVECEXP (insn, 1, i));
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return max_opno + 1;
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}
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/* Print out a wrapper macro for a function which corrects the number
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of arguments it takes. Any missing arguments are assumed to be at
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the end. */
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static void
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gen_macro (name, real, expect)
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const char *name;
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int real, expect;
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{
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int i;
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if (real > expect)
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abort ();
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if (real == 0)
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abort ();
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/* #define GEN_CALL(A, B, C, D) gen_call((A), (B)) */
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fputs ("#define GEN_", stdout);
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for (i = 0; name[i]; i++)
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putchar (TOUPPER (name[i]));
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putchar('(');
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for (i = 0; i < expect - 1; i++)
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printf ("%c, ", i + 'A');
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printf ("%c) gen_%s (", i + 'A', name);
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for (i = 0; i < real - 1; i++)
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printf ("(%c), ", i + 'A');
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printf ("(%c))\n", i + 'A');
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}
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/* Print out prototype information for a generator function. If the
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insn pattern has been elided, print out a dummy generator that
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does nothing. */
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static void
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gen_proto (insn)
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rtx insn;
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{
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int num = num_operands (insn);
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int i;
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const char *name = XSTR (insn, 0);
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int truth = maybe_eval_c_test (XSTR (insn, 2));
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/* Many md files don't refer to the last two operands passed to the
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call patterns. This means their generator functions will be two
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arguments too short. Instead of changing every md file to touch
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those operands, we wrap the prototypes in macros that take the
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correct number of arguments. */
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if (name[0] == 'c' || name[0] == 's')
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{
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if (!strcmp (name, "call")
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|| !strcmp (name, "call_pop")
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|| !strcmp (name, "sibcall")
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|| !strcmp (name, "sibcall_pop"))
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gen_macro (name, num, 4);
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else if (!strcmp (name, "call_value")
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|| !strcmp (name, "call_value_pop")
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|| !strcmp (name, "sibcall_value")
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|| !strcmp (name, "sibcall_value_pop"))
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gen_macro (name, num, 5);
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}
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if (truth != 0)
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printf ("extern rtx gen_%-*s PARAMS ((", max_id_len, name);
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else
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printf ("static inline rtx gen_%-*s PARAMS ((", max_id_len, name);
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if (num == 0)
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fputs ("void", stdout);
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else
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{
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for (i = 1; i < num; i++)
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fputs ("rtx, ", stdout);
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fputs ("rtx", stdout);
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}
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puts ("));");
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/* Some back ends want to take the address of generator functions,
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so we cannot simply use #define for these dummy definitions. */
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if (truth == 0)
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{
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printf ("static inline rtx\ngen_%s", name);
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if (num > 0)
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{
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putchar ('(');
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for (i = 0; i < num-1; i++)
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printf ("%c, ", 'a' + i);
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printf ("%c)\n", 'a' + i);
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for (i = 0; i < num; i++)
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printf (" rtx %c ATTRIBUTE_UNUSED;\n", 'a' + i);
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}
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else
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puts ("()");
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puts ("{\n return 0;\n}");
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}
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}
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static void
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gen_insn (insn)
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rtx insn;
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{
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const char *name = XSTR (insn, 0);
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const char *p;
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int len;
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int truth = maybe_eval_c_test (XSTR (insn, 2));
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/* Don't mention instructions whose names are the null string
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or begin with '*'. They are in the machine description just
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to be recognized. */
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if (name[0] == 0 || name[0] == '*')
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return;
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len = strlen (name);
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if (len > max_id_len)
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max_id_len = len;
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if (truth == 0)
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/* emit nothing */;
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else if (truth == 1)
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printf ("#define HAVE_%s 1\n", name);
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else
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{
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/* Write the macro definition, putting \'s at the end of each line,
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if more than one. */
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printf ("#define HAVE_%s (", name);
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for (p = XSTR (insn, 2); *p; p++)
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{
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if (IS_VSPACE (*p))
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fputs (" \\\n", stdout);
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else
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putchar (*p);
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}
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fputs (")\n", stdout);
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}
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obstack_grow (&obstack, &insn, sizeof (rtx));
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}
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extern int main PARAMS ((int, char **));
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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rtx desc;
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rtx dummy;
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rtx *insns;
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rtx *insn_ptr;
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progname = "genflags";
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obstack_init (&obstack);
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/* We need to see all the possibilities. Elided insns may have
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direct calls to their generators in C code. */
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insn_elision = 0;
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if (argc <= 1)
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fatal ("no input file name");
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if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
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return (FATAL_EXIT_CODE);
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puts ("/* Generated automatically by the program `genflags'");
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puts (" from the machine description file `md'. */\n");
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puts ("#ifndef GCC_INSN_FLAGS_H");
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puts ("#define GCC_INSN_FLAGS_H\n");
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/* Read the machine description. */
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while (1)
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{
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int line_no, insn_code_number = 0;
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desc = read_md_rtx (&line_no, &insn_code_number);
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if (desc == NULL)
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break;
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if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
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gen_insn (desc);
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}
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/* Print out the prototypes now. */
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dummy = (rtx) 0;
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obstack_grow (&obstack, &dummy, sizeof (rtx));
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insns = (rtx *) obstack_finish (&obstack);
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for (insn_ptr = insns; *insn_ptr; insn_ptr++)
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gen_proto (*insn_ptr);
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puts("\n#endif /* GCC_INSN_FLAGS_H */");
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if (ferror (stdout) || fflush (stdout) || fclose (stdout))
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return FATAL_EXIT_CODE;
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return SUCCESS_EXIT_CODE;
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}
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/* Define this so we can link with print-rtl.o to get debug_rtx function. */
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const char *
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get_insn_name (code)
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int code ATTRIBUTE_UNUSED;
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{
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return NULL;
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}
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