1f3b37a3d5
* rtl.def (DEFINE_INSN, DEFINE_INSN_AND_SPLIT, DEFINE_PEEPHOLE): Change output-template slot to format 'T'. * rtl.h (XTMPL): New. * read-rtl.c (read_escape): New function. (read_quoted_string, read_braced_string): Use it. (read_rtx): Set star_if_braced from the format string. Use XTMPL where appropriate. * genoutput.c (gen_insn, gen_peephole): Use XTMPL to get the template string. * rtl.c: Include errors.h for sake of rtl_check_failed* routines. Document 'T' in rtx format strings. * Makefile.in (rtl.o, $(HOST_PREFIX_1)rtl.o): Depend on errors.h. * errors.c (internal_error): Add missing ": " at end of string. * i860.md: Change triple backslashes to double backslashes at ends of lines in output templates. From-SVN: r43665
746 lines
18 KiB
C
746 lines
18 KiB
C
/* RTL reader for GNU C Compiler.
|
||
Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001
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||
Free Software Foundation, Inc.
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||
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||
This file is part of GNU CC.
|
||
|
||
GNU CC 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.
|
||
|
||
GNU CC 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 GNU CC; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 59 Temple Place - Suite 330,
|
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Boston, MA 02111-1307, USA. */
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||
|
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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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#define obstack_chunk_alloc xmalloc
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#define obstack_chunk_free free
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||
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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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/* 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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#ifndef ANSI_PROTOTYPES
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FILE *infile;
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const char *msg;
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#endif
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va_list ap;
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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_START (ap, msg);
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#ifndef ANSI_PROTOTYPES
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infile = va_arg (ap, FILE *);
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msg = va_arg (ap, const char *);
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#endif
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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_end (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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register 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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register 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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register char *p;
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register 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')
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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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|
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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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|
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c = read_skip_spaces (infile);
|
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if (c == '(')
|
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{
|
||
saw_paren = 1;
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c = read_skip_spaces (infile);
|
||
}
|
||
|
||
if (c == '"')
|
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stringbuf = read_quoted_string (ob, infile);
|
||
else if (c == '{')
|
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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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{
|
||
c = read_skip_spaces (infile);
|
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if (c != ')')
|
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fatal_expected_char (infile, ')', c);
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||
}
|
||
|
||
return stringbuf;
|
||
}
|
||
|
||
/* Provide a version of a function to read a long long if the system does
|
||
not provide one. */
|
||
#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)
|
||
const char *p;
|
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{
|
||
int neg = 0;
|
||
HOST_WIDE_INT tmp_wide;
|
||
|
||
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++;
|
||
|
||
tmp_wide = 0;
|
||
while (ISDIGIT(*p))
|
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{
|
||
HOST_WIDE_INT new_wide = tmp_wide*10 + (*p - '0');
|
||
if (new_wide < tmp_wide)
|
||
{
|
||
/* Return INT_MAX equiv on overflow. */
|
||
tmp_wide = (~(unsigned HOST_WIDE_INT)0) >> 1;
|
||
break;
|
||
}
|
||
tmp_wide = new_wide;
|
||
p++;
|
||
}
|
||
|
||
if (neg)
|
||
tmp_wide = -tmp_wide;
|
||
return tmp_wide;
|
||
}
|
||
#endif
|
||
|
||
/* Given a constant definition, return a hash code for its name. */
|
||
static unsigned
|
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def_hash (def)
|
||
const void *def;
|
||
{
|
||
unsigned result, i;
|
||
const char *string = ((const struct md_constant *)def)->name;
|
||
|
||
for (result = i = 0;*string++ != '\0'; i++)
|
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result += ((unsigned char) *string << (i % CHAR_BIT));
|
||
return result;
|
||
}
|
||
|
||
/* Given two constant definitions, return true if they have the same name. */
|
||
static int
|
||
def_name_eq_p (def1, def2)
|
||
const void *def1, *def2;
|
||
{
|
||
return ! strcmp (((const struct md_constant *)def1)->name,
|
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((const struct md_constant *)def2)->name);
|
||
}
|
||
|
||
/* INFILE is a FILE pointer to read text from. TMP_CHAR is a buffer suitable
|
||
to read a name or number into. Process a define_constants directive,
|
||
starting with the optional space after the "define_constants". */
|
||
static void
|
||
read_constants (infile, tmp_char)
|
||
FILE *infile;
|
||
char *tmp_char;
|
||
{
|
||
int c;
|
||
htab_t defs;
|
||
|
||
c = read_skip_spaces (infile);
|
||
if (c != '[')
|
||
fatal_expected_char (infile, '[', c);
|
||
defs = md_constants;
|
||
if (! defs)
|
||
defs = htab_create (32, def_hash, def_name_eq_p, (htab_del) 0);
|
||
/* Disable constant expansion during definition processing. */
|
||
md_constants = 0;
|
||
while ( (c = read_skip_spaces (infile)) != ']')
|
||
{
|
||
struct md_constant *def;
|
||
void **entry_ptr;
|
||
|
||
if (c != '(')
|
||
fatal_expected_char (infile, '(', c);
|
||
def = xmalloc (sizeof (struct md_constant));
|
||
def->name = tmp_char;
|
||
read_name (tmp_char, infile);
|
||
entry_ptr = htab_find_slot (defs, def, TRUE);
|
||
if (! *entry_ptr)
|
||
def->name = xstrdup (tmp_char);
|
||
c = read_skip_spaces (infile);
|
||
ungetc (c, infile);
|
||
read_name (tmp_char, infile);
|
||
if (! *entry_ptr)
|
||
{
|
||
def->value = xstrdup (tmp_char);
|
||
*entry_ptr = def;
|
||
}
|
||
else
|
||
{
|
||
def = *entry_ptr;
|
||
if (strcmp (def->value, tmp_char))
|
||
fatal_with_file_and_line (infile,
|
||
"redefinition of %s, was %s, now %s",
|
||
def->name, def->value, tmp_char);
|
||
}
|
||
c = read_skip_spaces (infile);
|
||
if (c != ')')
|
||
fatal_expected_char (infile, ')', c);
|
||
}
|
||
md_constants = defs;
|
||
c = read_skip_spaces (infile);
|
||
if (c != ')')
|
||
fatal_expected_char (infile, ')', c);
|
||
}
|
||
|
||
/* For every constant definition, call CALLBACK with two arguments:
|
||
a pointer a pointer to the constant definition and INFO.
|
||
Stops when CALLBACK returns zero. */
|
||
void
|
||
traverse_md_constants (callback, info)
|
||
htab_trav callback;
|
||
void *info;
|
||
{
|
||
if (md_constants)
|
||
htab_traverse (md_constants, callback, info);
|
||
}
|
||
|
||
/* Read an rtx in printed representation from INFILE
|
||
and return an actual rtx in core constructed accordingly.
|
||
read_rtx is not used in the compiler proper, but rather in
|
||
the utilities gen*.c that construct C code from machine descriptions. */
|
||
|
||
rtx
|
||
read_rtx (infile)
|
||
FILE *infile;
|
||
{
|
||
register int i, j;
|
||
RTX_CODE tmp_code;
|
||
register const char *format_ptr;
|
||
/* tmp_char is a buffer used for reading decimal integers
|
||
and names of rtx types and machine modes.
|
||
Therefore, 256 must be enough. */
|
||
char tmp_char[256];
|
||
rtx return_rtx;
|
||
register int c;
|
||
int tmp_int;
|
||
HOST_WIDE_INT tmp_wide;
|
||
|
||
/* Obstack used for allocating RTL objects. */
|
||
static struct obstack rtl_obstack;
|
||
static int initialized;
|
||
|
||
/* Linked list structure for making RTXs: */
|
||
struct rtx_list
|
||
{
|
||
struct rtx_list *next;
|
||
rtx value; /* Value of this node. */
|
||
};
|
||
|
||
if (!initialized) {
|
||
obstack_init (&rtl_obstack);
|
||
initialized = 1;
|
||
}
|
||
|
||
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);
|
||
#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);
|
||
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;
|
||
}
|