772 lines
18 KiB
C
772 lines
18 KiB
C
/* RTL reader for GNU C Compiler.
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Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002
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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, 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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#include "rtl.h"
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#include "obstack.h"
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#include "hashtab.h"
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#ifndef ISDIGIT
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#include <ctype.h>
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#define ISDIGIT isdigit
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#define ISSPACE isspace
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#endif
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#define obstack_chunk_alloc xmalloc
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#define obstack_chunk_free free
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static htab_t md_constants;
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static void fatal_with_file_and_line PARAMS ((FILE *, const char *, ...))
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ATTRIBUTE_PRINTF_2 ATTRIBUTE_NORETURN;
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static void fatal_expected_char PARAMS ((FILE *, int, int)) ATTRIBUTE_NORETURN;
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static void read_name PARAMS ((char *, FILE *));
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static char *read_string PARAMS ((struct obstack *, FILE *, int));
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static char *read_quoted_string PARAMS ((struct obstack *, FILE *));
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static char *read_braced_string PARAMS ((struct obstack *, FILE *));
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static void read_escape PARAMS ((struct obstack *, FILE *));
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static unsigned def_hash PARAMS ((const void *));
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static int def_name_eq_p PARAMS ((const void *, const void *));
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static void read_constants PARAMS ((FILE *infile, char *tmp_char));
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static void validate_const_int PARAMS ((FILE *, const char *));
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/* Subroutines of read_rtx. */
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/* The current line number for the file. */
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int read_rtx_lineno = 1;
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/* The filename for aborting with file and line. */
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const char *read_rtx_filename = "<unknown>";
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static void
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fatal_with_file_and_line VPARAMS ((FILE *infile, const char *msg, ...))
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{
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char context[64];
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size_t i;
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int c;
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VA_OPEN (ap, msg);
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VA_FIXEDARG (ap, FILE *, infile);
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VA_FIXEDARG (ap, const char *, msg);
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fprintf (stderr, "%s:%d: ", read_rtx_filename, read_rtx_lineno);
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vfprintf (stderr, msg, ap);
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putc ('\n', stderr);
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/* Gather some following context. */
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for (i = 0; i < sizeof (context)-1; ++i)
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{
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c = getc (infile);
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if (c == EOF)
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break;
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if (c == '\r' || c == '\n')
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break;
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context[i] = c;
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}
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context[i] = '\0';
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fprintf (stderr, "%s:%d: following context is `%s'\n",
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read_rtx_filename, read_rtx_lineno, context);
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VA_CLOSE (ap);
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exit (1);
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}
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/* Dump code after printing a message. Used when read_rtx finds
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invalid data. */
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static void
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fatal_expected_char (infile, expected_c, actual_c)
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FILE *infile;
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int expected_c, actual_c;
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{
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fatal_with_file_and_line (infile, "expected character `%c', found `%c'",
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expected_c, actual_c);
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}
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/* Read chars from INFILE until a non-whitespace char
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and return that. Comments, both Lisp style and C style,
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are treated as whitespace.
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Tools such as genflags use this function. */
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int
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read_skip_spaces (infile)
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FILE *infile;
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{
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int c;
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while (1)
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{
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c = getc (infile);
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switch (c)
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{
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case '\n':
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read_rtx_lineno++;
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break;
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case ' ': case '\t': case '\f': case '\r':
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break;
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case ';':
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do
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c = getc (infile);
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while (c != '\n' && c != EOF);
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read_rtx_lineno++;
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break;
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case '/':
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{
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int prevc;
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c = getc (infile);
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if (c != '*')
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fatal_expected_char (infile, '*', c);
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prevc = 0;
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while ((c = getc (infile)) && c != EOF)
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{
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if (c == '\n')
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read_rtx_lineno++;
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else if (prevc == '*' && c == '/')
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break;
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prevc = c;
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}
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}
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break;
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default:
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return c;
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}
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}
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}
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/* Read an rtx code name into the buffer STR[].
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It is terminated by any of the punctuation chars of rtx printed syntax. */
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static void
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read_name (str, infile)
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char *str;
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FILE *infile;
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{
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char *p;
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int c;
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c = read_skip_spaces (infile);
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p = str;
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while (1)
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{
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if (c == ' ' || c == '\n' || c == '\t' || c == '\f' || c == '\r')
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break;
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if (c == ':' || c == ')' || c == ']' || c == '"' || c == '/'
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|| c == '(' || c == '[')
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{
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ungetc (c, infile);
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break;
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}
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*p++ = c;
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c = getc (infile);
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}
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if (p == str)
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fatal_with_file_and_line (infile, "missing name or number");
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if (c == '\n')
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read_rtx_lineno++;
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*p = 0;
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if (md_constants)
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{
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/* Do constant expansion. */
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struct md_constant *def;
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p = str;
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do
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{
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struct md_constant tmp_def;
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tmp_def.name = p;
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def = htab_find (md_constants, &tmp_def);
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if (def)
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p = def->value;
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} while (def);
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if (p != str)
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strcpy (str, p);
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}
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}
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/* Subroutine of the string readers. Handles backslash escapes.
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Caller has read the backslash, but not placed it into the obstack. */
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static void
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read_escape (ob, infile)
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struct obstack *ob;
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FILE *infile;
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{
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int c = getc (infile);
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switch (c)
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{
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/* Backslash-newline is replaced by nothing, as in C. */
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case '\n':
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read_rtx_lineno++;
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return;
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/* \" \' \\ are replaced by the second character. */
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case '\\':
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case '"':
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case '\'':
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break;
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/* Standard C string escapes:
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\a \b \f \n \r \t \v
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\[0-7] \x
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all are passed through to the output string unmolested.
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In normal use these wind up in a string constant processed
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by the C compiler, which will translate them appropriately.
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We do not bother checking that \[0-7] are followed by up to
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two octal digits, or that \x is followed by N hex digits.
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\? \u \U are left out because they are not in traditional C. */
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case 'a': case 'b': case 'f': case 'n': case 'r': case 't': case 'v':
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case '0': case '1': case '2': case '3': case '4': case '5': case '6':
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case '7': case 'x':
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obstack_1grow (ob, '\\');
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break;
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/* \; makes stuff for a C string constant containing
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newline and tab. */
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case ';':
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obstack_grow (ob, "\\n\\t", 4);
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return;
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/* pass anything else through, but issue a warning. */
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default:
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fprintf (stderr, "%s:%d: warning: unrecognized escape \\%c\n",
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read_rtx_filename, read_rtx_lineno, c);
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obstack_1grow (ob, '\\');
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break;
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}
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obstack_1grow (ob, c);
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}
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/* Read a double-quoted string onto the obstack. Caller has scanned
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the leading quote. */
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static char *
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read_quoted_string (ob, infile)
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struct obstack *ob;
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FILE *infile;
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{
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int c;
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while (1)
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{
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c = getc (infile); /* Read the string */
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if (c == '\n')
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read_rtx_lineno++;
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else if (c == '\\')
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{
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read_escape (ob, infile);
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continue;
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}
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else if (c == '"')
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break;
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obstack_1grow (ob, c);
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}
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obstack_1grow (ob, 0);
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return obstack_finish (ob);
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}
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/* Read a braced string (a la Tcl) onto the obstack. Caller has
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scanned the leading brace. Note that unlike quoted strings,
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the outermost braces _are_ included in the string constant. */
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static char *
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read_braced_string (ob, infile)
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struct obstack *ob;
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FILE *infile;
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{
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int c;
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int brace_depth = 1; /* caller-processed */
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obstack_1grow (ob, '{');
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while (brace_depth)
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{
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c = getc (infile); /* Read the string */
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if (c == '\n')
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read_rtx_lineno++;
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else if (c == '{')
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brace_depth++;
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else if (c == '}')
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brace_depth--;
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else if (c == '\\')
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{
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read_escape (ob, infile);
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continue;
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}
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obstack_1grow (ob, c);
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}
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obstack_1grow (ob, 0);
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return obstack_finish (ob);
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}
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/* Read some kind of string constant. This is the high-level routine
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used by read_rtx. It handles surrounding parentheses, leading star,
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and dispatch to the appropriate string constant reader. */
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static char *
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read_string (ob, infile, star_if_braced)
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struct obstack *ob;
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FILE *infile;
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int star_if_braced;
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{
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char *stringbuf;
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int saw_paren = 0;
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int c;
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c = read_skip_spaces (infile);
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if (c == '(')
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{
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saw_paren = 1;
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c = read_skip_spaces (infile);
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}
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if (c == '"')
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stringbuf = read_quoted_string (ob, infile);
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else if (c == '{')
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{
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if (star_if_braced)
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obstack_1grow (ob, '*');
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stringbuf = read_braced_string (ob, infile);
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}
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else
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fatal_with_file_and_line (infile, "expected `\"' or `{', found `%c'", c);
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if (saw_paren)
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{
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c = read_skip_spaces (infile);
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if (c != ')')
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fatal_expected_char (infile, ')', c);
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}
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return stringbuf;
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}
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/* Provide a version of a function to read a long long if the system does
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not provide one. */
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#if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_LONG && !defined(HAVE_ATOLL) && !defined(HAVE_ATOQ)
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HOST_WIDE_INT
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atoll (p)
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const char *p;
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{
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int neg = 0;
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HOST_WIDE_INT tmp_wide;
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while (ISSPACE (*p))
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p++;
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if (*p == '-')
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neg = 1, p++;
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else if (*p == '+')
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p++;
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tmp_wide = 0;
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while (ISDIGIT (*p))
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{
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HOST_WIDE_INT new_wide = tmp_wide*10 + (*p - '0');
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if (new_wide < tmp_wide)
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{
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/* Return INT_MAX equiv on overflow. */
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tmp_wide = (~(unsigned HOST_WIDE_INT) 0) >> 1;
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break;
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}
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tmp_wide = new_wide;
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p++;
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}
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if (neg)
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tmp_wide = -tmp_wide;
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return tmp_wide;
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}
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#endif
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/* Given a constant definition, return a hash code for its name. */
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static unsigned
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def_hash (def)
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const void *def;
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{
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unsigned result, i;
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const char *string = ((const struct md_constant *) def)->name;
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for (result = i = 0;*string++ != '\0'; i++)
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result += ((unsigned char) *string << (i % CHAR_BIT));
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return result;
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}
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/* Given two constant definitions, return true if they have the same name. */
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static int
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def_name_eq_p (def1, def2)
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const void *def1, *def2;
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{
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return ! strcmp (((const struct md_constant *) def1)->name,
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((const struct md_constant *) def2)->name);
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}
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/* INFILE is a FILE pointer to read text from. TMP_CHAR is a buffer suitable
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to read a name or number into. Process a define_constants directive,
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starting with the optional space after the "define_constants". */
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static void
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read_constants (infile, tmp_char)
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FILE *infile;
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char *tmp_char;
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{
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int c;
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htab_t defs;
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c = read_skip_spaces (infile);
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if (c != '[')
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fatal_expected_char (infile, '[', c);
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defs = md_constants;
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if (! defs)
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defs = htab_create (32, def_hash, def_name_eq_p, (htab_del) 0);
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/* Disable constant expansion during definition processing. */
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md_constants = 0;
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while ( (c = read_skip_spaces (infile)) != ']')
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{
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struct md_constant *def;
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void **entry_ptr;
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if (c != '(')
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fatal_expected_char (infile, '(', c);
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def = xmalloc (sizeof (struct md_constant));
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def->name = tmp_char;
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read_name (tmp_char, infile);
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entry_ptr = htab_find_slot (defs, def, TRUE);
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if (! *entry_ptr)
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def->name = xstrdup (tmp_char);
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c = read_skip_spaces (infile);
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ungetc (c, infile);
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read_name (tmp_char, infile);
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if (! *entry_ptr)
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{
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def->value = xstrdup (tmp_char);
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*entry_ptr = def;
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}
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else
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{
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def = *entry_ptr;
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if (strcmp (def->value, tmp_char))
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fatal_with_file_and_line (infile,
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"redefinition of %s, was %s, now %s",
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def->name, def->value, tmp_char);
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}
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c = read_skip_spaces (infile);
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if (c != ')')
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fatal_expected_char (infile, ')', c);
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}
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md_constants = defs;
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c = read_skip_spaces (infile);
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if (c != ')')
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fatal_expected_char (infile, ')', c);
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}
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/* For every constant definition, call CALLBACK with two arguments:
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a pointer a pointer to the constant definition and INFO.
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Stops when CALLBACK returns zero. */
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void
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traverse_md_constants (callback, info)
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htab_trav callback;
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void *info;
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{
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if (md_constants)
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htab_traverse (md_constants, callback, info);
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}
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static void
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validate_const_int (infile, string)
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FILE *infile;
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const char *string;
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{
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const char *cp;
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int valid = 1;
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cp = string;
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while (*cp && ISSPACE (*cp))
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cp++;
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if (*cp == '-' || *cp == '+')
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cp++;
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if (*cp == 0)
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valid = 0;
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for (; *cp; cp++)
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if (! ISDIGIT (*cp))
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valid = 0;
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if (!valid)
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fatal_with_file_and_line (infile, "invalid decimal constant \"%s\"\n", string);
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}
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/* Read an rtx in printed representation from INFILE
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and return an actual rtx in core constructed accordingly.
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read_rtx is not used in the compiler proper, but rather in
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the utilities gen*.c that construct C code from machine descriptions. */
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rtx
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read_rtx (infile)
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FILE *infile;
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{
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int i, j;
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RTX_CODE tmp_code;
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const char *format_ptr;
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/* tmp_char is a buffer used for reading decimal integers
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and names of rtx types and machine modes.
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Therefore, 256 must be enough. */
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char tmp_char[256];
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rtx return_rtx;
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int c;
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int tmp_int;
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HOST_WIDE_INT tmp_wide;
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/* Obstack used for allocating RTL objects. */
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static struct obstack rtl_obstack;
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static int initialized;
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/* Linked list structure for making RTXs: */
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struct rtx_list
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{
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struct rtx_list *next;
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rtx value; /* Value of this node. */
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};
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if (!initialized) {
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obstack_init (&rtl_obstack);
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initialized = 1;
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}
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||
|
||
again:
|
||
c = read_skip_spaces (infile); /* Should be open paren. */
|
||
if (c != '(')
|
||
fatal_expected_char (infile, '(', c);
|
||
|
||
read_name (tmp_char, infile);
|
||
|
||
tmp_code = UNKNOWN;
|
||
|
||
if (! strcmp (tmp_char, "define_constants"))
|
||
{
|
||
read_constants (infile, tmp_char);
|
||
goto again;
|
||
}
|
||
for (i = 0; i < NUM_RTX_CODE; i++)
|
||
if (! strcmp (tmp_char, GET_RTX_NAME (i)))
|
||
{
|
||
tmp_code = (RTX_CODE) i; /* get value for name */
|
||
break;
|
||
}
|
||
|
||
if (tmp_code == UNKNOWN)
|
||
fatal_with_file_and_line (infile, "unknown rtx code `%s'", tmp_char);
|
||
|
||
/* (NIL) stands for an expression that isn't there. */
|
||
if (tmp_code == NIL)
|
||
{
|
||
/* Discard the closeparen. */
|
||
while ((c = getc (infile)) && c != ')')
|
||
;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* If we end up with an insn expression then we free this space below. */
|
||
return_rtx = rtx_alloc (tmp_code);
|
||
format_ptr = GET_RTX_FORMAT (GET_CODE (return_rtx));
|
||
|
||
/* If what follows is `: mode ', read it and
|
||
store the mode in the rtx. */
|
||
|
||
i = read_skip_spaces (infile);
|
||
if (i == ':')
|
||
{
|
||
read_name (tmp_char, infile);
|
||
for (j = 0; j < NUM_MACHINE_MODES; j++)
|
||
if (! strcmp (GET_MODE_NAME (j), tmp_char))
|
||
break;
|
||
|
||
if (j == MAX_MACHINE_MODE)
|
||
fatal_with_file_and_line (infile, "unknown mode `%s'", tmp_char);
|
||
|
||
PUT_MODE (return_rtx, (enum machine_mode) j);
|
||
}
|
||
else
|
||
ungetc (i, infile);
|
||
|
||
for (i = 0; i < GET_RTX_LENGTH (GET_CODE (return_rtx)); i++)
|
||
switch (*format_ptr++)
|
||
{
|
||
/* 0 means a field for internal use only.
|
||
Don't expect it to be present in the input. */
|
||
case '0':
|
||
break;
|
||
|
||
case 'e':
|
||
case 'u':
|
||
XEXP (return_rtx, i) = read_rtx (infile);
|
||
break;
|
||
|
||
case 'V':
|
||
/* 'V' is an optional vector: if a closeparen follows,
|
||
just store NULL for this element. */
|
||
c = read_skip_spaces (infile);
|
||
ungetc (c, infile);
|
||
if (c == ')')
|
||
{
|
||
XVEC (return_rtx, i) = 0;
|
||
break;
|
||
}
|
||
/* Now process the vector. */
|
||
|
||
case 'E':
|
||
{
|
||
/* Obstack to store scratch vector in. */
|
||
struct obstack vector_stack;
|
||
int list_counter = 0;
|
||
rtvec return_vec = NULL_RTVEC;
|
||
|
||
c = read_skip_spaces (infile);
|
||
if (c != '[')
|
||
fatal_expected_char (infile, '[', c);
|
||
|
||
/* add expressions to a list, while keeping a count */
|
||
obstack_init (&vector_stack);
|
||
while ((c = read_skip_spaces (infile)) && c != ']')
|
||
{
|
||
ungetc (c, infile);
|
||
list_counter++;
|
||
obstack_ptr_grow (&vector_stack, (PTR) read_rtx (infile));
|
||
}
|
||
if (list_counter > 0)
|
||
{
|
||
return_vec = rtvec_alloc (list_counter);
|
||
memcpy (&return_vec->elem[0], obstack_finish (&vector_stack),
|
||
list_counter * sizeof (rtx));
|
||
}
|
||
XVEC (return_rtx, i) = return_vec;
|
||
obstack_free (&vector_stack, NULL);
|
||
/* close bracket gotten */
|
||
}
|
||
break;
|
||
|
||
case 'S':
|
||
/* 'S' is an optional string: if a closeparen follows,
|
||
just store NULL for this element. */
|
||
c = read_skip_spaces (infile);
|
||
ungetc (c, infile);
|
||
if (c == ')')
|
||
{
|
||
XSTR (return_rtx, i) = 0;
|
||
break;
|
||
}
|
||
|
||
case 'T':
|
||
case 's':
|
||
{
|
||
char *stringbuf;
|
||
|
||
/* The output template slot of a DEFINE_INSN,
|
||
DEFINE_INSN_AND_SPLIT, or DEFINE_PEEPHOLE automatically
|
||
gets a star inserted as its first character, if it is
|
||
written with a brace block instead of a string constant. */
|
||
int star_if_braced = (format_ptr[-1] == 'T');
|
||
|
||
stringbuf = read_string (&rtl_obstack, infile, star_if_braced);
|
||
|
||
/* For insn patterns, we want to provide a default name
|
||
based on the file and line, like "*foo.md:12", if the
|
||
given name is blank. These are only for define_insn and
|
||
define_insn_and_split, to aid debugging. */
|
||
if (*stringbuf == '\0'
|
||
&& i == 0
|
||
&& (GET_CODE (return_rtx) == DEFINE_INSN
|
||
|| GET_CODE (return_rtx) == DEFINE_INSN_AND_SPLIT))
|
||
{
|
||
char line_name[20];
|
||
const char *fn = (read_rtx_filename ? read_rtx_filename : "rtx");
|
||
const char *slash;
|
||
for (slash = fn; *slash; slash ++)
|
||
if (*slash == '/' || *slash == '\\' || *slash == ':')
|
||
fn = slash + 1;
|
||
obstack_1grow (&rtl_obstack, '*');
|
||
obstack_grow (&rtl_obstack, fn, strlen (fn));
|
||
sprintf (line_name, ":%d", read_rtx_lineno);
|
||
obstack_grow (&rtl_obstack, line_name, strlen (line_name)+1);
|
||
stringbuf = (char *) obstack_finish (&rtl_obstack);
|
||
}
|
||
|
||
if (star_if_braced)
|
||
XTMPL (return_rtx, i) = stringbuf;
|
||
else
|
||
XSTR (return_rtx, i) = stringbuf;
|
||
}
|
||
break;
|
||
|
||
case 'w':
|
||
read_name (tmp_char, infile);
|
||
validate_const_int (infile, tmp_char);
|
||
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
|
||
tmp_wide = atoi (tmp_char);
|
||
#else
|
||
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
|
||
tmp_wide = atol (tmp_char);
|
||
#else
|
||
/* Prefer atoll over atoq, since the former is in the ISO C99 standard.
|
||
But prefer not to use our hand-rolled function above either. */
|
||
#if defined(HAVE_ATOLL) || !defined(HAVE_ATOQ)
|
||
tmp_wide = atoll (tmp_char);
|
||
#else
|
||
tmp_wide = atoq (tmp_char);
|
||
#endif
|
||
#endif
|
||
#endif
|
||
XWINT (return_rtx, i) = tmp_wide;
|
||
break;
|
||
|
||
case 'i':
|
||
case 'n':
|
||
read_name (tmp_char, infile);
|
||
validate_const_int (infile, tmp_char);
|
||
tmp_int = atoi (tmp_char);
|
||
XINT (return_rtx, i) = tmp_int;
|
||
break;
|
||
|
||
default:
|
||
fprintf (stderr,
|
||
"switch format wrong in rtl.read_rtx(). format was: %c.\n",
|
||
format_ptr[-1]);
|
||
fprintf (stderr, "\tfile position: %ld\n", ftell (infile));
|
||
abort ();
|
||
}
|
||
|
||
c = read_skip_spaces (infile);
|
||
if (c != ')')
|
||
fatal_expected_char (infile, ')', c);
|
||
|
||
return return_rtx;
|
||
}
|