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/* Generate code to allocate RTL structures.

   Copyright (C) 1997, 1998, 1999, 2000, 2002, 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"

struct rtx_definition

{

  const char *const enumname, *const name, *const format;

};

/* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what

   CONST_DOUBLE_FORMAT is because we're not going to be generating

   anything for CONST_DOUBLE anyway.  */

#define CONST_DOUBLE_FORMAT ""

#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT },

static const struct rtx_definition defs[] =

{

#include "rtl.def"              /* rtl expressions are documented here */

};

#define NUM_RTX_CODE ARRAY_SIZE(defs)

static const char *formats[NUM_RTX_CODE];

static const char *type_from_format     (int);

static const char *accessor_from_format (int);

static int special_format               (const char *);

static int special_rtx                  (int);

static int excluded_rtx                 (int);

static void find_formats                (void);

static void gendecl                     (const char *);

static void genmacro                    (int);

static void gendef                      (const char *);

static void genlegend                   (void);

static void genheader                   (void);

static void gencode                     (void);

/* Decode a format letter into a C type string.  */

static const char *

type_from_format (int c)

{

  switch (c)

    {

    case 'i':

      return "int ";

    case 'w':

      return "HOST_WIDE_INT ";

    case 's':

      return "const char *";

    case 'e':  case 'u':

      return "rtx ";

    case 'E':

      return "rtvec ";

    case 'b':

      return "struct bitmap_head_def *";  /* bitmap - typedef not available */

    case 't':

      return "union tree_node *";  /* tree - typedef not available */

    case 'B':

      return "struct basic_block_def *";  /* basic block - typedef not available */

    default:

      gcc_unreachable ();

    }

}

/* Decode a format letter into the proper accessor function.  */

static const char *

accessor_from_format (int c)

{

  switch (c)

    {

    case 'i':

      return "XINT";

    case 'w':

      return "XWINT";

    case 's':

      return "XSTR";

    case 'e':  case 'u':

      return "XEXP";

    case 'E':

      return "XVEC";

    case 'b':

      return "XBITMAP";

    case 't':

      return "XTREE";

    case 'B':

      return "XBBDEF";

    default:

      gcc_unreachable ();

    }

}

/* Return nonzero if we should ignore FMT, an RTL format, when making

   the list of formats we write routines to create.  */

static int

special_format (const char *fmt)

{

  return (strchr (fmt, '*') != 0

          || strchr (fmt, 'V') != 0

          || strchr (fmt, 'S') != 0

          || strchr (fmt, 'n') != 0);

}

/* Return nonzero if the RTL code given by index IDX is one that we should

   generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO

   is a wrapper in emit-rtl.c).  */

static int

special_rtx (int idx)

{

  return (strcmp (defs[idx].enumname, "CONST_INT") == 0

          || strcmp (defs[idx].enumname, "REG") == 0

          || strcmp (defs[idx].enumname, "SUBREG") == 0

          || strcmp (defs[idx].enumname, "MEM") == 0

          || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);

}

/* Return nonzero if the RTL code given by index IDX is one that we should

   generate no macro for at all (because gen_rtx_FOO is never used or

   cannot have the obvious interface).  */

static int

excluded_rtx (int idx)

{

  return (strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0);

}

/* Place a list of all format specifiers we use into the array FORMAT.  */

static void

find_formats (void)

{

  unsigned int i;

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

    {

      const char **f;

      if (special_format (defs[i].format))

        continue;

      for (f = formats; *f; f++)

        if (! strcmp (*f, defs[i].format))

          break;

      if (*f == 0)

        *f = defs[i].format;

    }

}

/* Write the declarations for the routine to allocate RTL with FORMAT.  */

static void

gendecl (const char *format)

{

  const char *p;

  int i, pos;

  printf ("extern rtx gen_rtx_fmt_%s\t (RTX_CODE, ", format);

  printf ("enum machine_mode mode");

  /* Write each parameter that is needed and start a new line when the line

     would overflow.  */

  for (p = format, i = 0, pos = 75; *p != 0; p++)

    if (*p != '0')

      {

        int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);

        printf (",");

        if (pos + ourlen > 76)

          printf ("\n\t\t\t\t      "), pos = 39;

        printf (" %sarg%d", type_from_format (*p), i++);

        pos += ourlen;

      }

  printf (");\n");

}

/* Generate macros to generate RTL of code IDX using the functions we

   write.  */

static void

genmacro (int idx)

{

  const char *p;

  int i;

  /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to

     gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE.  */

  if (excluded_rtx (idx))

    /* Don't define a macro for this code.  */

    return;

  printf ("#define gen_rtx_%s%s(MODE",

           special_rtx (idx) ? "raw_" : "", defs[idx].enumname);

  for (p = defs[idx].format, i = 0; *p != 0; p++)

    if (*p != '0')

      printf (", ARG%d", i++);

  printf (") \\\n  gen_rtx_fmt_%s (%s, (MODE)",

          defs[idx].format, defs[idx].enumname);

  for (p = defs[idx].format, i = 0; *p != 0; p++)

    if (*p != '0')

      printf (", (ARG%d)", i++);

  puts (")");

}

/* Generate the code for the function to generate RTL whose

   format is FORMAT.  */

static void

gendef (const char *format)

{

  const char *p;

  int i, j;

  /* Start by writing the definition of the function name and the types

     of the arguments.  */

  printf ("rtx\ngen_rtx_fmt_%s (RTX_CODE code, enum machine_mode mode", format);

  for (p = format, i = 0; *p != 0; p++)

    if (*p != '0')

      printf (",\n\t%sarg%d", type_from_format (*p), i++);

  puts (")");

  /* Now write out the body of the function itself, which allocates

     the memory and initializes it.  */

  puts ("{");

  puts ("  rtx rt;");

  puts ("  rt = rtx_alloc (code);\n");

  puts ("  PUT_MODE (rt, mode);");

  for (p = format, i = j = 0; *p ; ++p, ++i)

    if (*p != '0')

      printf ("  %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);

    else

      printf ("  X0EXP (rt, %d) = NULL_RTX;\n", i);

  puts ("\n  return rt;\n}\n");

}

/* Generate the documentation header for files we write.  */

static void

genlegend (void)

{

  puts ("/* Generated automatically by gengenrtl from rtl.def.  */\n");

}

/* Generate the text of the header file we make, genrtl.h.  */

static void

genheader (void)

{

  unsigned int i;

  const char **fmt;

  puts ("#ifndef GCC_GENRTL_H");

  puts ("#define GCC_GENRTL_H\n");

  for (fmt = formats; *fmt; ++fmt)

    gendecl (*fmt);

  putchar ('\n');

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

    if (! special_format (defs[i].format))

      genmacro (i);

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

}

/* Generate the text of the code file we write, genrtl.c.  */

static void

gencode (void)

{

  const char **fmt;

  puts ("#include \"config.h\"");

  puts ("#include \"system.h\"");

  puts ("#include \"coretypes.h\"");

  puts ("#include \"tm.h\"");

  puts ("#include \"obstack.h\"");

  puts ("#include \"rtl.h\"");

  puts ("#include \"ggc.h\"\n");

  for (fmt = formats; *fmt != 0; fmt++)

    gendef (*fmt);

}

/* This is the main program.  We accept only one argument, "-h", which

   says we are writing the genrtl.h file.  Otherwise we are writing the

   genrtl.c file.  */

int

main (int argc, char **argv)

{

  find_formats ();

  genlegend ();

  if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')

    genheader ();

  else

    gencode ();

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

    return FATAL_EXIT_CODE;

  return SUCCESS_EXIT_CODE;

}