354 lines
8.1 KiB
C
354 lines
8.1 KiB
C
/* Generate code to allocate RTL structures.
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Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004
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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, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "bconfig.h"
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#include "system.h"
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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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/* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what
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CONST_DOUBLE_FORMAT is because we're not going to be generating
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anything for CONST_DOUBLE anyway. */
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#define CONST_DOUBLE_FORMAT ""
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #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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#define NUM_RTX_CODE ARRAY_SIZE(defs)
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static const char *formats[NUM_RTX_CODE];
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static const char *type_from_format (int);
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static const char *accessor_from_format (int);
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static int special_format (const char *);
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static int special_rtx (int);
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static int excluded_rtx (int);
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static void find_formats (void);
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static void gendecl (const char *);
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static void genmacro (int);
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static void gendef (const char *);
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static void genlegend (void);
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static void genheader (void);
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static void gencode (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 (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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case 'B':
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return "struct basic_block_def *"; /* basic block - typedef not available */
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default:
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gcc_unreachable ();
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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 (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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case 'B':
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return "XBBDEF";
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default:
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gcc_unreachable ();
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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 (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
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generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO
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is a wrapper in emit-rtl.c). */
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static int
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special_rtx (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, "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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|| strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
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}
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/* Return nonzero if the RTL code given by index IDX is one that we should
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generate no macro for at all (because gen_rtx_FOO is never used or
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cannot have the obvious interface). */
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static int
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excluded_rtx (int idx)
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{
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return (strcmp (defs[idx].enumname, "CONST_DOUBLE") == 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 (void)
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{
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unsigned 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 (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\t (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 (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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if (excluded_rtx (idx))
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/* Don't define a macro for this code. */
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return;
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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 (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 (RTX_CODE code, enum machine_mode 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 (",\n\t%sarg%d", type_from_format (*p), i++);
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puts (")");
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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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puts (" rt = rtx_alloc (code);\n");
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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 (void)
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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 (void)
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{
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unsigned 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 (void)
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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 \"coretypes.h\"");
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puts ("#include \"tm.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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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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int
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main (int argc, 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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