freebsd-src/contrib/gcc/gengenrtl.c
David E. O'Brien 1952e2e1c1 Enlist the FreeBSD-CURRENT users as testers of what is to become Gcc 3.1.0.
These bits are taken from the FSF anoncvs repo on 1-Feb-2002 08:20 PST.
2002-02-01 18:16:02 +00:00

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/* Generate code to allocate RTL structures.
Copyright (C) 1997, 1998, 1999, 2000 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 2, 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 COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "hconfig.h"
#include "system.h"
#define NO_GENRTL_H
#include "rtl.h"
#undef abort
#include "real.h"
/* Calculate the format for CONST_DOUBLE. This depends on the relative
widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
We need to go out to e0wwwww, since REAL_ARITHMETIC assumes 16-bits
per element in REAL_VALUE_TYPE.
This is duplicated in rtl.c.
A number of places assume that there are always at least two 'w'
slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
#ifdef REAL_ARITHMETIC
# if MAX_LONG_DOUBLE_TYPE_SIZE == 96
# define REAL_WIDTH \
(11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
# else
# if MAX_LONG_DOUBLE_TYPE_SIZE == 128
# define REAL_WIDTH \
(19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
# else
# if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
# define REAL_WIDTH \
(7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
# endif
# endif
# endif
#endif /* REAL_ARITHMETIC */
#ifndef REAL_WIDTH
# if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
# define REAL_WIDTH 2
# else
# if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
# define REAL_WIDTH 3
# else
# if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
# define REAL_WIDTH 4
# endif
# endif
# endif
#endif /* REAL_WIDTH */
#if REAL_WIDTH == 1
# define CONST_DOUBLE_FORMAT "0ww"
#else
# if REAL_WIDTH == 2
# define CONST_DOUBLE_FORMAT "0ww"
# else
# if REAL_WIDTH == 3
# define CONST_DOUBLE_FORMAT "0www"
# else
# if REAL_WIDTH == 4
# define CONST_DOUBLE_FORMAT "0wwww"
# else
# if REAL_WIDTH == 5
# define CONST_DOUBLE_FORMAT "0wwwww"
# else
# define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
# endif
# endif
# endif
# endif
#endif
struct rtx_definition
{
const char *const enumname, *const name, *const format;
};
#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGX(ENUM), NAME, FORMAT },
static const struct rtx_definition defs[] =
{
#include "rtl.def" /* rtl expressions are documented here */
};
static const char *formats[NUM_RTX_CODE];
static const char *type_from_format PARAMS ((int));
static const char *accessor_from_format PARAMS ((int));
static int special_format PARAMS ((const char *));
static int special_rtx PARAMS ((int));
static void find_formats PARAMS ((void));
static void gendecl PARAMS ((const char *));
static void genmacro PARAMS ((int));
static void gendef PARAMS ((const char *));
static void genlegend PARAMS ((void));
static void genheader PARAMS ((void));
static void gencode PARAMS ((void));
/* Decode a format letter into a C type string. */
static const char *
type_from_format (c)
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 */
default:
abort ();
}
}
/* Decode a format letter into the proper accessor function. */
static const char *
accessor_from_format (c)
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";
default:
abort ();
}
}
/* 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 (fmt)
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 not
generate a gen_RTX_FOO function foo (because that function is present
elsewhere in the compiler). */
static int
special_rtx (idx)
int idx;
{
return (strcmp (defs[idx].enumname, "CONST_INT") == 0
|| strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
|| strcmp (defs[idx].enumname, "REG") == 0
|| strcmp (defs[idx].enumname, "SUBREG") == 0
|| strcmp (defs[idx].enumname, "MEM") == 0);
}
/* Place a list of all format specifiers we use into the array FORMAT. */
static void
find_formats ()
{
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 (format)
const char *format;
{
const char *p;
int i, pos;
printf ("extern rtx gen_rtx_fmt_%s\tPARAMS ((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 (idx)
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. */
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 (format)
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 (code, mode", format);
for (p = format, i = 0; *p != 0; p++)
if (*p != '0')
printf (", arg%d", i++);
puts (")\n RTX_CODE code;\n enum machine_mode mode;");
for (p = format, i = 0; *p != 0; p++)
if (*p != '0')
printf (" %sarg%d;\n", type_from_format (*p), i++);
/* Now write out the body of the function itself, which allocates
the memory and initializes it. */
puts ("{");
puts (" rtx rt;");
printf (" rt = ggc_alloc_rtx (%d);\n", (int) strlen (format));
puts (" memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));\n");
puts (" PUT_CODE (rt, code);");
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 ()
{
puts ("/* Generated automatically by gengenrtl from rtl.def. */\n");
}
/* Generate the text of the header file we make, genrtl.h. */
static void
genheader ()
{
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 ()
{
const char **fmt;
puts ("#include \"config.h\"");
puts ("#include \"system.h\"");
puts ("#include \"obstack.h\"");
puts ("#include \"rtl.h\"");
puts ("#include \"ggc.h\"\n");
puts ("extern struct obstack *rtl_obstack;\n");
puts ("#define obstack_alloc_rtx(n) \\");
puts (" ((rtx) obstack_alloc (rtl_obstack, \\");
puts (" sizeof (struct rtx_def) \\");
puts (" + ((n) - 1) * sizeof (rtunion)))\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. */
extern int main PARAMS ((int, char **));
int
main (argc, argv)
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;
}