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/* Generate from machine description:

   - some flags HAVE_... saying which simple standard instructions are

   available for this machine.

   Copyright (C) 1987, 1991, 1995, 1998, 1999, 2000, 2003, 2004, 2007

   Free Software Foundation, Inc.

This file is part of GCC.

GCC 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 3, or (at your option) any later

version.

GCC 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 GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "bconfig.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "rtl.h"

#include "obstack.h"

#include "errors.h"

#include "gensupport.h"

/* Obstack to remember insns with.  */

static struct obstack obstack;

/* Max size of names encountered.  */

static int max_id_len;

/* Max operand encountered in a scan over some insn.  */

static int max_opno;

static void max_operand_1 (rtx);

static int num_operands (rtx);

static void gen_proto (rtx);

static void gen_macro (const char *, int, int);

static void gen_insn (rtx);

/* Count the number of match_operand's found.  */

static void

max_operand_1 (rtx x)

{

  RTX_CODE code;

  int i;

  int len;

  const char *fmt;

  if (x == 0)

    return;

  code = GET_CODE (x);

  if (code == MATCH_OPERAND || code == MATCH_OPERATOR

      || code == MATCH_PARALLEL)

    max_opno = MAX (max_opno, XINT (x, 0));

  fmt = GET_RTX_FORMAT (code);

  len = GET_RTX_LENGTH (code);

  for (i = 0; i < len; i++)

    {

      if (fmt[i] == 'e' || fmt[i] == 'u')

        max_operand_1 (XEXP (x, i));

      else if (fmt[i] == 'E')

        {

          int j;

          for (j = 0; j < XVECLEN (x, i); j++)

            max_operand_1 (XVECEXP (x, i, j));

        }

    }

}

static int

num_operands (rtx insn)

{

  int len = XVECLEN (insn, 1);

  int i;

  max_opno = -1;

  for (i = 0; i < len; i++)

    max_operand_1 (XVECEXP (insn, 1, i));

  return max_opno + 1;

}

/* Print out a wrapper macro for a function which corrects the number

   of arguments it takes.  Any missing arguments are assumed to be at

   the end.  */

static void

gen_macro (const char *name, int real, int expect)

{

  int i;

  gcc_assert (real <= expect);

  gcc_assert (real);

  /* #define GEN_CALL(A, B, C, D) gen_call((A), (B)) */

  fputs ("#define GEN_", stdout);

  for (i = 0; name[i]; i++)

    putchar (TOUPPER (name[i]));

  putchar('(');

  for (i = 0; i < expect - 1; i++)

    printf ("%c, ", i + 'A');

  printf ("%c) gen_%s (", i + 'A', name);

  for (i = 0; i < real - 1; i++)

    printf ("(%c), ", i + 'A');

  printf ("(%c))\n", i + 'A');

}

/* Print out prototype information for a generator function.  If the

   insn pattern has been elided, print out a dummy generator that

   does nothing.  */

static void

gen_proto (rtx insn)

{

  int num = num_operands (insn);

  int i;

  const char *name = XSTR (insn, 0);

  int truth = maybe_eval_c_test (XSTR (insn, 2));

  /* Many md files don't refer to the last two operands passed to the

     call patterns.  This means their generator functions will be two

     arguments too short.  Instead of changing every md file to touch

     those operands, we wrap the prototypes in macros that take the

     correct number of arguments.  */

  if (name[0] == 'c' || name[0] == 's')

    {

      if (!strcmp (name, "call")

          || !strcmp (name, "call_pop")

          || !strcmp (name, "sibcall")

          || !strcmp (name, "sibcall_pop"))

        gen_macro (name, num, 4);

      else if (!strcmp (name, "call_value")

               || !strcmp (name, "call_value_pop")

               || !strcmp (name, "sibcall_value")

               || !strcmp (name, "sibcall_value_pop"))

        gen_macro (name, num, 5);

    }

  if (truth != 0)

    printf ("extern rtx        gen_%-*s (", max_id_len, name);

  else

    printf ("static inline rtx gen_%-*s (", max_id_len, name);

  if (num == 0)

    fputs ("void", stdout);

  else

    {

      for (i = 1; i < num; i++)

        fputs ("rtx, ", stdout);

      fputs ("rtx", stdout);

    }

  puts (");");

  /* Some back ends want to take the address of generator functions,

     so we cannot simply use #define for these dummy definitions.  */

  if (truth == 0)

    {

      printf ("static inline rtx\ngen_%s", name);

      if (num > 0)

        {

          putchar ('(');

          for (i = 0; i < num-1; i++)

            printf ("rtx ARG_UNUSED (%c), ", 'a' + i);

          printf ("rtx ARG_UNUSED (%c))\n", 'a' + i);

        }

      else

        puts ("(void)");

      puts ("{\n  return 0;\n}");

    }

}

static void

gen_insn (rtx insn)

{

  const char *name = XSTR (insn, 0);

  const char *p;

  int len;

  int truth = maybe_eval_c_test (XSTR (insn, 2));

  /* Don't mention instructions whose names are the null string

     or begin with '*'.  They are in the machine description just

     to be recognized.  */

  if (name[0] == 0 || name[0] == '*')

    return;

  len = strlen (name);

  if (len > max_id_len)

    max_id_len = len;

  if (truth == 0)

    /* Emit nothing.  */;

  else if (truth == 1)

    printf ("#define HAVE_%s 1\n", name);

  else

    {

      /* Write the macro definition, putting \'s at the end of each line,

         if more than one.  */

      printf ("#define HAVE_%s (", name);

      for (p = XSTR (insn, 2); *p; p++)

        {

          if (IS_VSPACE (*p))

            fputs (" \\\n", stdout);

          else

            putchar (*p);

        }

      fputs (")\n", stdout);

    }

  obstack_grow (&obstack, &insn, sizeof (rtx));

}

int

main (int argc, char **argv)

{

  rtx desc;

  rtx dummy;

  rtx *insns;

  rtx *insn_ptr;

  progname = "genflags";

  obstack_init (&obstack);

  /* We need to see all the possibilities.  Elided insns may have

     direct calls to their generators in C code.  */

  insn_elision = 0;

  if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)

    return (FATAL_EXIT_CODE);

  puts ("/* Generated automatically by the program `genflags'");

  puts ("   from the machine description file `md'.  */\n");

  puts ("#ifndef GCC_INSN_FLAGS_H");

  puts ("#define GCC_INSN_FLAGS_H\n");

  /* Read the machine description.  */

  while (1)

    {

      int line_no, insn_code_number = 0;

      desc = read_md_rtx (&line_no, &insn_code_number);

      if (desc == NULL)

        break;

      if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)

        gen_insn (desc);

    }

  /* Print out the prototypes now.  */

  dummy = (rtx) 0;

  obstack_grow (&obstack, &dummy, sizeof (rtx));

  insns = XOBFINISH (&obstack, rtx *);

  for (insn_ptr = insns; *insn_ptr; insn_ptr++)

    gen_proto (*insn_ptr);

  puts("\n#endif /* GCC_INSN_FLAGS_H */");

  if (ferror (stdout) || fflush (stdout) || fclose (stdout))

    return FATAL_EXIT_CODE;

  return SUCCESS_EXIT_CODE;

}