1 /* RTL reader for GNU C Compiler.
2 Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
28 static htab_t md_constants
;
30 static void fatal_with_file_and_line
PARAMS ((FILE *, const char *, ...))
31 ATTRIBUTE_PRINTF_2 ATTRIBUTE_NORETURN
;
32 static void fatal_expected_char
PARAMS ((FILE *, int, int)) ATTRIBUTE_NORETURN
;
33 static void read_name
PARAMS ((char *, FILE *));
34 static char *read_string
PARAMS ((struct obstack
*, FILE *, int));
35 static char *read_quoted_string
PARAMS ((struct obstack
*, FILE *));
36 static char *read_braced_string
PARAMS ((struct obstack
*, FILE *));
37 static void read_escape
PARAMS ((struct obstack
*, FILE *));
38 static unsigned def_hash
PARAMS ((const void *));
39 static int def_name_eq_p
PARAMS ((const void *, const void *));
40 static void read_constants
PARAMS ((FILE *infile
, char *tmp_char
));
41 static void validate_const_int
PARAMS ((FILE *, const char *));
43 /* Subroutines of read_rtx. */
45 /* The current line number for the file. */
46 int read_rtx_lineno
= 1;
48 /* The filename for aborting with file and line. */
49 const char *read_rtx_filename
= "<unknown>";
52 fatal_with_file_and_line
VPARAMS ((FILE *infile
, const char *msg
, ...))
59 VA_FIXEDARG (ap
, FILE *, infile
);
60 VA_FIXEDARG (ap
, const char *, msg
);
62 fprintf (stderr
, "%s:%d: ", read_rtx_filename
, read_rtx_lineno
);
63 vfprintf (stderr
, msg
, ap
);
66 /* Gather some following context. */
67 for (i
= 0; i
< sizeof (context
)-1; ++i
)
72 if (c
== '\r' || c
== '\n')
78 fprintf (stderr
, "%s:%d: following context is `%s'\n",
79 read_rtx_filename
, read_rtx_lineno
, context
);
85 /* Dump code after printing a message. Used when read_rtx finds
89 fatal_expected_char (infile
, expected_c
, actual_c
)
91 int expected_c
, actual_c
;
93 fatal_with_file_and_line (infile
, "expected character `%c', found `%c'",
94 expected_c
, actual_c
);
97 /* Read chars from INFILE until a non-whitespace char
98 and return that. Comments, both Lisp style and C style,
99 are treated as whitespace.
100 Tools such as genflags use this function. */
103 read_skip_spaces (infile
)
117 case ' ': case '\t': case '\f': case '\r':
123 while (c
!= '\n' && c
!= EOF
);
132 fatal_expected_char (infile
, '*', c
);
135 while ((c
= getc (infile
)) && c
!= EOF
)
139 else if (prevc
== '*' && c
== '/')
152 /* Read an rtx code name into the buffer STR[].
153 It is terminated by any of the punctuation chars of rtx printed syntax. */
156 read_name (str
, infile
)
163 c
= read_skip_spaces (infile
);
168 if (c
== ' ' || c
== '\n' || c
== '\t' || c
== '\f' || c
== '\r')
170 if (c
== ':' || c
== ')' || c
== ']' || c
== '"' || c
== '/'
171 || c
== '(' || c
== '[')
180 fatal_with_file_and_line (infile
, "missing name or number");
188 /* Do constant expansion. */
189 struct md_constant
*def
;
194 struct md_constant tmp_def
;
197 def
= htab_find (md_constants
, &tmp_def
);
206 /* Subroutine of the string readers. Handles backslash escapes.
207 Caller has read the backslash, but not placed it into the obstack. */
209 read_escape (ob
, infile
)
213 int c
= getc (infile
);
217 /* Backslash-newline is replaced by nothing, as in C. */
222 /* \" \' \\ are replaced by the second character. */
228 /* Standard C string escapes:
231 all are passed through to the output string unmolested.
232 In normal use these wind up in a string constant processed
233 by the C compiler, which will translate them appropriately.
234 We do not bother checking that \[0-7] are followed by up to
235 two octal digits, or that \x is followed by N hex digits.
236 \? \u \U are left out because they are not in traditional C. */
237 case 'a': case 'b': case 'f': case 'n': case 'r': case 't': case 'v':
238 case '0': case '1': case '2': case '3': case '4': case '5': case '6':
240 obstack_1grow (ob
, '\\');
243 /* \; makes stuff for a C string constant containing
246 obstack_grow (ob
, "\\n\\t", 4);
249 /* pass anything else through, but issue a warning. */
251 fprintf (stderr
, "%s:%d: warning: unrecognized escape \\%c\n",
252 read_rtx_filename
, read_rtx_lineno
, c
);
253 obstack_1grow (ob
, '\\');
257 obstack_1grow (ob
, c
);
261 /* Read a double-quoted string onto the obstack. Caller has scanned
262 the leading quote. */
264 read_quoted_string (ob
, infile
)
272 c
= getc (infile
); /* Read the string */
277 read_escape (ob
, infile
);
283 obstack_1grow (ob
, c
);
286 obstack_1grow (ob
, 0);
287 return obstack_finish (ob
);
290 /* Read a braced string (a la Tcl) onto the obstack. Caller has
291 scanned the leading brace. Note that unlike quoted strings,
292 the outermost braces _are_ included in the string constant. */
294 read_braced_string (ob
, infile
)
299 int brace_depth
= 1; /* caller-processed */
301 obstack_1grow (ob
, '{');
304 c
= getc (infile
); /* Read the string */
313 read_escape (ob
, infile
);
317 obstack_1grow (ob
, c
);
320 obstack_1grow (ob
, 0);
321 return obstack_finish (ob
);
324 /* Read some kind of string constant. This is the high-level routine
325 used by read_rtx. It handles surrounding parentheses, leading star,
326 and dispatch to the appropriate string constant reader. */
329 read_string (ob
, infile
, star_if_braced
)
338 c
= read_skip_spaces (infile
);
342 c
= read_skip_spaces (infile
);
346 stringbuf
= read_quoted_string (ob
, infile
);
350 obstack_1grow (ob
, '*');
351 stringbuf
= read_braced_string (ob
, infile
);
354 fatal_with_file_and_line (infile
, "expected `\"' or `{', found `%c'", c
);
358 c
= read_skip_spaces (infile
);
360 fatal_expected_char (infile
, ')', c
);
366 /* Provide a version of a function to read a long long if the system does
368 #if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_LONG && !defined(HAVE_ATOLL) && !defined(HAVE_ATOQ)
374 HOST_WIDE_INT tmp_wide
;
386 HOST_WIDE_INT new_wide
= tmp_wide
*10 + (*p
- '0');
387 if (new_wide
< tmp_wide
)
389 /* Return INT_MAX equiv on overflow. */
390 tmp_wide
= (~(unsigned HOST_WIDE_INT
) 0) >> 1;
398 tmp_wide
= -tmp_wide
;
403 /* Given a constant definition, return a hash code for its name. */
409 const char *string
= ((const struct md_constant
*) def
)->name
;
411 for (result
= i
= 0;*string
++ != '\0'; i
++)
412 result
+= ((unsigned char) *string
<< (i
% CHAR_BIT
));
416 /* Given two constant definitions, return true if they have the same name. */
418 def_name_eq_p (def1
, def2
)
419 const void *def1
, *def2
;
421 return ! strcmp (((const struct md_constant
*) def1
)->name
,
422 ((const struct md_constant
*) def2
)->name
);
425 /* INFILE is a FILE pointer to read text from. TMP_CHAR is a buffer suitable
426 to read a name or number into. Process a define_constants directive,
427 starting with the optional space after the "define_constants". */
429 read_constants (infile
, tmp_char
)
436 c
= read_skip_spaces (infile
);
438 fatal_expected_char (infile
, '[', c
);
441 defs
= htab_create (32, def_hash
, def_name_eq_p
, (htab_del
) 0);
442 /* Disable constant expansion during definition processing. */
444 while ( (c
= read_skip_spaces (infile
)) != ']')
446 struct md_constant
*def
;
450 fatal_expected_char (infile
, '(', c
);
451 def
= xmalloc (sizeof (struct md_constant
));
452 def
->name
= tmp_char
;
453 read_name (tmp_char
, infile
);
454 entry_ptr
= htab_find_slot (defs
, def
, TRUE
);
456 def
->name
= xstrdup (tmp_char
);
457 c
= read_skip_spaces (infile
);
459 read_name (tmp_char
, infile
);
462 def
->value
= xstrdup (tmp_char
);
468 if (strcmp (def
->value
, tmp_char
))
469 fatal_with_file_and_line (infile
,
470 "redefinition of %s, was %s, now %s",
471 def
->name
, def
->value
, tmp_char
);
473 c
= read_skip_spaces (infile
);
475 fatal_expected_char (infile
, ')', c
);
478 c
= read_skip_spaces (infile
);
480 fatal_expected_char (infile
, ')', c
);
483 /* For every constant definition, call CALLBACK with two arguments:
484 a pointer a pointer to the constant definition and INFO.
485 Stops when CALLBACK returns zero. */
487 traverse_md_constants (callback
, info
)
492 htab_traverse (md_constants
, callback
, info
);
496 validate_const_int (infile
, string
)
504 while (*cp
&& ISSPACE (*cp
))
506 if (*cp
== '-' || *cp
== '+')
514 fatal_with_file_and_line (infile
, "invalid decimal constant \"%s\"\n", string
);
517 /* Read an rtx in printed representation from INFILE
518 and return an actual rtx in core constructed accordingly.
519 read_rtx is not used in the compiler proper, but rather in
520 the utilities gen*.c that construct C code from machine descriptions. */
528 const char *format_ptr
;
529 /* tmp_char is a buffer used for reading decimal integers
530 and names of rtx types and machine modes.
531 Therefore, 256 must be enough. */
536 HOST_WIDE_INT tmp_wide
;
538 /* Obstack used for allocating RTL objects. */
539 static struct obstack rtl_obstack
;
540 static int initialized
;
542 /* Linked list structure for making RTXs: */
545 struct rtx_list
*next
;
546 rtx value
; /* Value of this node. */
550 obstack_init (&rtl_obstack
);
555 c
= read_skip_spaces (infile
); /* Should be open paren. */
557 fatal_expected_char (infile
, '(', c
);
559 read_name (tmp_char
, infile
);
563 if (! strcmp (tmp_char
, "define_constants"))
565 read_constants (infile
, tmp_char
);
568 for (i
= 0; i
< NUM_RTX_CODE
; i
++)
569 if (! strcmp (tmp_char
, GET_RTX_NAME (i
)))
571 tmp_code
= (RTX_CODE
) i
; /* get value for name */
575 if (tmp_code
== UNKNOWN
)
576 fatal_with_file_and_line (infile
, "unknown rtx code `%s'", tmp_char
);
578 /* (NIL) stands for an expression that isn't there. */
581 /* Discard the closeparen. */
582 while ((c
= getc (infile
)) && c
!= ')')
588 /* If we end up with an insn expression then we free this space below. */
589 return_rtx
= rtx_alloc (tmp_code
);
590 format_ptr
= GET_RTX_FORMAT (GET_CODE (return_rtx
));
592 /* If what follows is `: mode ', read it and
593 store the mode in the rtx. */
595 i
= read_skip_spaces (infile
);
598 read_name (tmp_char
, infile
);
599 for (j
= 0; j
< NUM_MACHINE_MODES
; j
++)
600 if (! strcmp (GET_MODE_NAME (j
), tmp_char
))
603 if (j
== MAX_MACHINE_MODE
)
604 fatal_with_file_and_line (infile
, "unknown mode `%s'", tmp_char
);
606 PUT_MODE (return_rtx
, (enum machine_mode
) j
);
611 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (return_rtx
)); i
++)
612 switch (*format_ptr
++)
614 /* 0 means a field for internal use only.
615 Don't expect it to be present in the input. */
621 XEXP (return_rtx
, i
) = read_rtx (infile
);
625 /* 'V' is an optional vector: if a closeparen follows,
626 just store NULL for this element. */
627 c
= read_skip_spaces (infile
);
631 XVEC (return_rtx
, i
) = 0;
634 /* Now process the vector. */
638 /* Obstack to store scratch vector in. */
639 struct obstack vector_stack
;
640 int list_counter
= 0;
641 rtvec return_vec
= NULL_RTVEC
;
643 c
= read_skip_spaces (infile
);
645 fatal_expected_char (infile
, '[', c
);
647 /* add expressions to a list, while keeping a count */
648 obstack_init (&vector_stack
);
649 while ((c
= read_skip_spaces (infile
)) && c
!= ']')
653 obstack_ptr_grow (&vector_stack
, (PTR
) read_rtx (infile
));
655 if (list_counter
> 0)
657 return_vec
= rtvec_alloc (list_counter
);
658 memcpy (&return_vec
->elem
[0], obstack_finish (&vector_stack
),
659 list_counter
* sizeof (rtx
));
661 XVEC (return_rtx
, i
) = return_vec
;
662 obstack_free (&vector_stack
, NULL
);
663 /* close bracket gotten */
668 /* 'S' is an optional string: if a closeparen follows,
669 just store NULL for this element. */
670 c
= read_skip_spaces (infile
);
674 XSTR (return_rtx
, i
) = 0;
683 /* The output template slot of a DEFINE_INSN,
684 DEFINE_INSN_AND_SPLIT, or DEFINE_PEEPHOLE automatically
685 gets a star inserted as its first character, if it is
686 written with a brace block instead of a string constant. */
687 int star_if_braced
= (format_ptr
[-1] == 'T');
689 stringbuf
= read_string (&rtl_obstack
, infile
, star_if_braced
);
691 /* For insn patterns, we want to provide a default name
692 based on the file and line, like "*foo.md:12", if the
693 given name is blank. These are only for define_insn and
694 define_insn_and_split, to aid debugging. */
695 if (*stringbuf
== '\0'
697 && (GET_CODE (return_rtx
) == DEFINE_INSN
698 || GET_CODE (return_rtx
) == DEFINE_INSN_AND_SPLIT
))
701 const char *fn
= (read_rtx_filename
? read_rtx_filename
: "rtx");
703 for (slash
= fn
; *slash
; slash
++)
704 if (*slash
== '/' || *slash
== '\\' || *slash
== ':')
706 obstack_1grow (&rtl_obstack
, '*');
707 obstack_grow (&rtl_obstack
, fn
, strlen (fn
));
708 sprintf (line_name
, ":%d", read_rtx_lineno
);
709 obstack_grow (&rtl_obstack
, line_name
, strlen (line_name
)+1);
710 stringbuf
= (char *) obstack_finish (&rtl_obstack
);
714 XTMPL (return_rtx
, i
) = stringbuf
;
716 XSTR (return_rtx
, i
) = stringbuf
;
721 read_name (tmp_char
, infile
);
722 validate_const_int (infile
, tmp_char
);
723 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
724 tmp_wide
= atoi (tmp_char
);
726 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
727 tmp_wide
= atol (tmp_char
);
729 /* Prefer atoll over atoq, since the former is in the ISO C99 standard.
730 But prefer not to use our hand-rolled function above either. */
731 #if defined(HAVE_ATOLL) || !defined(HAVE_ATOQ)
732 tmp_wide
= atoll (tmp_char
);
734 tmp_wide
= atoq (tmp_char
);
738 XWINT (return_rtx
, i
) = tmp_wide
;
743 read_name (tmp_char
, infile
);
744 validate_const_int (infile
, tmp_char
);
745 tmp_int
= atoi (tmp_char
);
746 XINT (return_rtx
, i
) = tmp_int
;
751 "switch format wrong in rtl.read_rtx(). format was: %c.\n",
753 fprintf (stderr
, "\tfile position: %ld\n", ftell (infile
));
757 c
= read_skip_spaces (infile
);
759 fatal_expected_char (infile
, ')', c
);