416 lines
9.6 KiB
C
416 lines
9.6 KiB
C
/* Generate code to allocate RTL structures.
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Copyright (C) 1997, 1998, 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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#define NO_GENRTL_H
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#include "rtl.h"
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#undef abort
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#include "real.h"
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/* Calculate the format for CONST_DOUBLE. This depends on the relative
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widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
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We need to go out to e0wwwww, since REAL_ARITHMETIC assumes 16-bits
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per element in REAL_VALUE_TYPE.
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This is duplicated in rtl.c.
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A number of places assume that there are always at least two 'w'
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slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
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#ifdef REAL_ARITHMETIC
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# if MAX_LONG_DOUBLE_TYPE_SIZE == 96
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# define REAL_WIDTH \
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(11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
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# else
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# if MAX_LONG_DOUBLE_TYPE_SIZE == 128
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# define REAL_WIDTH \
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(19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
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# else
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# if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
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# define REAL_WIDTH \
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(7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
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# endif
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# endif
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# endif
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#endif /* REAL_ARITHMETIC */
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#ifndef REAL_WIDTH
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# if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
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# define REAL_WIDTH 2
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# else
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# if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
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# define REAL_WIDTH 3
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# else
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# if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
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# define REAL_WIDTH 4
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# endif
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# endif
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# endif
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#endif /* REAL_WIDTH */
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#if REAL_WIDTH == 1
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# define CONST_DOUBLE_FORMAT "0ww"
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#else
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# if REAL_WIDTH == 2
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# define CONST_DOUBLE_FORMAT "0ww"
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# else
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# if REAL_WIDTH == 3
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# define CONST_DOUBLE_FORMAT "0www"
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# else
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# if REAL_WIDTH == 4
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# define CONST_DOUBLE_FORMAT "0wwww"
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# else
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# if REAL_WIDTH == 5
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# define CONST_DOUBLE_FORMAT "0wwwww"
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# else
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# define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
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# endif
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# endif
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# endif
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# endif
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#endif
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struct rtx_definition
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{
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const char *const enumname, *const name, *const format;
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};
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGX(ENUM), NAME, FORMAT },
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static const struct rtx_definition defs[] =
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{
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#include "rtl.def" /* rtl expressions are documented here */
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};
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static const char *formats[NUM_RTX_CODE];
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static const char *type_from_format PARAMS ((int));
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static const char *accessor_from_format PARAMS ((int));
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static int special_format PARAMS ((const char *));
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static int special_rtx PARAMS ((int));
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static void find_formats PARAMS ((void));
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static void gendecl PARAMS ((const char *));
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static void genmacro PARAMS ((int));
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static void gendef PARAMS ((const char *));
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static void genlegend PARAMS ((void));
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static void genheader PARAMS ((void));
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static void gencode PARAMS ((void));
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/* Decode a format letter into a C type string. */
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static const char *
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type_from_format (c)
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int c;
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{
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switch (c)
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{
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case 'i':
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return "int ";
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case 'w':
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return "HOST_WIDE_INT ";
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case 's':
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return "const char *";
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case 'e': case 'u':
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return "rtx ";
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case 'E':
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return "rtvec ";
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case 'b':
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return "struct bitmap_head_def *"; /* bitmap - typedef not available */
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case 't':
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return "union tree_node *"; /* tree - typedef not available */
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default:
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abort ();
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}
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}
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/* Decode a format letter into the proper accessor function. */
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static const char *
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accessor_from_format (c)
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int c;
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{
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switch (c)
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{
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case 'i':
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return "XINT";
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case 'w':
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return "XWINT";
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case 's':
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return "XSTR";
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case 'e': case 'u':
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return "XEXP";
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case 'E':
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return "XVEC";
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case 'b':
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return "XBITMAP";
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case 't':
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return "XTREE";
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default:
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abort ();
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}
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}
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/* Return nonzero if we should ignore FMT, an RTL format, when making
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the list of formats we write routines to create. */
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static int
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special_format (fmt)
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const char *fmt;
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{
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return (strchr (fmt, '*') != 0
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|| strchr (fmt, 'V') != 0
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|| strchr (fmt, 'S') != 0
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|| strchr (fmt, 'n') != 0);
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}
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/* Return nonzero if the RTL code given by index IDX is one that we should not
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generate a gen_RTX_FOO function foo (because that function is present
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elsewhere in the compiler). */
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static int
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special_rtx (idx)
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int idx;
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{
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return (strcmp (defs[idx].enumname, "CONST_INT") == 0
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|| strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
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|| strcmp (defs[idx].enumname, "REG") == 0
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|| strcmp (defs[idx].enumname, "SUBREG") == 0
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|| strcmp (defs[idx].enumname, "MEM") == 0);
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}
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/* Place a list of all format specifiers we use into the array FORMAT. */
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static void
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find_formats ()
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{
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int i;
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for (i = 0; i < NUM_RTX_CODE; i++)
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{
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const char **f;
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if (special_format (defs[i].format))
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continue;
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for (f = formats; *f; f++)
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if (! strcmp (*f, defs[i].format))
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break;
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if (*f == 0)
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*f = defs[i].format;
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}
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}
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/* Write the declarations for the routine to allocate RTL with FORMAT. */
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static void
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gendecl (format)
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const char *format;
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{
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const char *p;
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int i, pos;
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printf ("extern rtx gen_rtx_fmt_%s\tPARAMS ((RTX_CODE, ", format);
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printf ("enum machine_mode mode");
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/* Write each parameter that is needed and start a new line when the line
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would overflow. */
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for (p = format, i = 0, pos = 75; *p != 0; p++)
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if (*p != '0')
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{
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int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
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printf (",");
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if (pos + ourlen > 76)
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printf ("\n\t\t\t\t "), pos = 39;
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printf (" %sarg%d", type_from_format (*p), i++);
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pos += ourlen;
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}
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printf ("));\n");
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}
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/* Generate macros to generate RTL of code IDX using the functions we
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write. */
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static void
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genmacro (idx)
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int idx;
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{
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const char *p;
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int i;
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/* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
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gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */
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printf ("#define gen_rtx_%s%s(MODE",
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special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
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for (p = defs[idx].format, i = 0; *p != 0; p++)
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if (*p != '0')
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printf (", ARG%d", i++);
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printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)",
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defs[idx].format, defs[idx].enumname);
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for (p = defs[idx].format, i = 0; *p != 0; p++)
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if (*p != '0')
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printf (", (ARG%d)", i++);
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puts (")");
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}
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/* Generate the code for the function to generate RTL whose
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format is FORMAT. */
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static void
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gendef (format)
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const char *format;
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{
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const char *p;
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int i, j;
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/* Start by writing the definition of the function name and the types
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of the arguments. */
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printf ("rtx\ngen_rtx_fmt_%s (code, mode", format);
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for (p = format, i = 0; *p != 0; p++)
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if (*p != '0')
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printf (", arg%d", i++);
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puts (")\n RTX_CODE code;\n enum machine_mode mode;");
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for (p = format, i = 0; *p != 0; p++)
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if (*p != '0')
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printf (" %sarg%d;\n", type_from_format (*p), i++);
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/* Now write out the body of the function itself, which allocates
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the memory and initializes it. */
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puts ("{");
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puts (" rtx rt;");
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printf (" rt = ggc_alloc_rtx (%d);\n", (int) strlen (format));
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puts (" memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));\n");
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puts (" PUT_CODE (rt, code);");
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puts (" PUT_MODE (rt, mode);");
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for (p = format, i = j = 0; *p ; ++p, ++i)
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if (*p != '0')
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printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
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else
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printf (" X0EXP (rt, %d) = NULL_RTX;\n", i);
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puts ("\n return rt;\n}\n");
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}
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/* Generate the documentation header for files we write. */
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static void
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genlegend ()
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{
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puts ("/* Generated automatically by gengenrtl from rtl.def. */\n");
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}
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/* Generate the text of the header file we make, genrtl.h. */
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static void
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genheader ()
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{
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int i;
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const char **fmt;
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puts ("#ifndef GCC_GENRTL_H");
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puts ("#define GCC_GENRTL_H\n");
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for (fmt = formats; *fmt; ++fmt)
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gendecl (*fmt);
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putchar ('\n');
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for (i = 0; i < NUM_RTX_CODE; i++)
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if (! special_format (defs[i].format))
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genmacro (i);
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puts ("\n#endif /* GCC_GENRTL_H */");
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}
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/* Generate the text of the code file we write, genrtl.c. */
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static void
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gencode ()
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{
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const char **fmt;
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puts ("#include \"config.h\"");
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puts ("#include \"system.h\"");
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puts ("#include \"obstack.h\"");
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puts ("#include \"rtl.h\"");
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puts ("#include \"ggc.h\"\n");
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puts ("extern struct obstack *rtl_obstack;\n");
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puts ("#define obstack_alloc_rtx(n) \\");
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puts (" ((rtx) obstack_alloc (rtl_obstack, \\");
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puts (" sizeof (struct rtx_def) \\");
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puts (" + ((n) - 1) * sizeof (rtunion)))\n");
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for (fmt = formats; *fmt != 0; fmt++)
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gendef (*fmt);
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}
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/* This is the main program. We accept only one argument, "-h", which
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says we are writing the genrtl.h file. Otherwise we are writing the
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genrtl.c file. */
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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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find_formats ();
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genlegend ();
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if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
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genheader ();
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else
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gencode ();
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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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