1 /* RTL reader for GNU C Compiler.
2 Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001
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 #define obstack_chunk_alloc xmalloc
29 #define obstack_chunk_free free
31 static htab_t md_constants;
33 static void fatal_with_file_and_line PARAMS ((FILE *, const char *, ...))
34 ATTRIBUTE_PRINTF_2 ATTRIBUTE_NORETURN;
35 static void fatal_expected_char PARAMS ((FILE *, int, int)) ATTRIBUTE_NORETURN;
36 static void read_name PARAMS ((char *, FILE *));
37 static char *read_string PARAMS ((struct obstack *, FILE *, int));
38 static char *read_quoted_string PARAMS ((struct obstack *, FILE *));
39 static char *read_braced_string PARAMS ((struct obstack *, FILE *));
40 static void read_escape PARAMS ((struct obstack *, FILE *));
41 static unsigned def_hash PARAMS ((const void *));
42 static int def_name_eq_p PARAMS ((const void *, const void *));
43 static void read_constants PARAMS ((FILE *infile, char *tmp_char));
45 /* Subroutines of read_rtx. */
47 /* The current line number for the file. */
48 int read_rtx_lineno = 1;
50 /* The filename for aborting with file and line. */
51 const char *read_rtx_filename = "<unknown>";
54 fatal_with_file_and_line VPARAMS ((FILE *infile, const char *msg, ...))
61 VA_FIXEDARG (ap, FILE *, infile);
62 VA_FIXEDARG (ap, const char *, msg);
64 fprintf (stderr, "%s:%d: ", read_rtx_filename, read_rtx_lineno);
65 vfprintf (stderr, msg, ap);
68 /* Gather some following context. */
69 for (i = 0; i < sizeof(context)-1; ++i)
74 if (c == '\r' || c == '\n')
80 fprintf (stderr, "%s:%d: following context is `%s'\n",
81 read_rtx_filename, read_rtx_lineno, context);
87 /* Dump code after printing a message. Used when read_rtx finds
91 fatal_expected_char (infile, expected_c, actual_c)
93 int expected_c, actual_c;
95 fatal_with_file_and_line (infile, "expected character `%c', found `%c'",
96 expected_c, actual_c);
99 /* Read chars from INFILE until a non-whitespace char
100 and return that. Comments, both Lisp style and C style,
101 are treated as whitespace.
102 Tools such as genflags use this function. */
105 read_skip_spaces (infile)
118 case ' ': case '\t': case '\f': case '\r':
124 while (c != '\n' && c != EOF);
133 fatal_expected_char (infile, '*', c);
136 while ((c = getc (infile)) && c != EOF)
140 else if (prevc == '*' && c == '/')
153 /* Read an rtx code name into the buffer STR[].
154 It is terminated by any of the punctuation chars of rtx printed syntax. */
157 read_name (str, infile)
164 c = read_skip_spaces(infile);
169 if (c == ' ' || c == '\n' || c == '\t' || c == '\f' || c == '\r')
171 if (c == ':' || c == ')' || c == ']' || c == '"' || c == '/'
172 || c == '(' || c == '[')
181 fatal_with_file_and_line (infile, "missing name or number");
189 /* Do constant expansion. */
190 struct md_constant *def;
195 struct md_constant tmp_def;
198 def = htab_find (md_constants, &tmp_def);
207 /* Subroutine of the string readers. Handles backslash escapes.
208 Caller has read the backslash, but not placed it into the obstack. */
210 read_escape (ob, infile)
214 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)
271 c = getc (infile); /* Read the string */
276 read_escape (ob, infile);
282 obstack_1grow (ob, c);
285 obstack_1grow (ob, 0);
286 return obstack_finish (ob);
289 /* Read a braced string (a la Tcl) onto the obstack. Caller has
290 scanned the leading brace. Note that unlike quoted strings,
291 the outermost braces _are_ included in the string constant. */
293 read_braced_string (ob, infile)
298 int brace_depth = 1; /* caller-processed */
300 obstack_1grow (ob, '{');
303 c = getc (infile); /* Read the string */
312 read_escape (ob, infile);
316 obstack_1grow (ob, c);
319 obstack_1grow (ob, 0);
320 return obstack_finish (ob);
323 /* Read some kind of string constant. This is the high-level routine
324 used by read_rtx. It handles surrounding parentheses, leading star,
325 and dispatch to the appropriate string constant reader. */
328 read_string (ob, infile, star_if_braced)
337 c = read_skip_spaces (infile);
341 c = read_skip_spaces (infile);
345 stringbuf = read_quoted_string (ob, infile);
349 obstack_1grow (ob, '*');
350 stringbuf = read_braced_string (ob, infile);
353 fatal_with_file_and_line (infile, "expected `\"' or `{', found `%c'", c);
357 c = read_skip_spaces (infile);
359 fatal_expected_char (infile, ')', c);
365 /* Provide a version of a function to read a long long if the system does
367 #if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_LONG && !defined(HAVE_ATOLL) && !defined(HAVE_ATOQ)
373 HOST_WIDE_INT tmp_wide;
385 HOST_WIDE_INT new_wide = tmp_wide*10 + (*p - '0');
386 if (new_wide < tmp_wide)
388 /* Return INT_MAX equiv on overflow. */
389 tmp_wide = (~(unsigned HOST_WIDE_INT)0) >> 1;
397 tmp_wide = -tmp_wide;
402 /* Given a constant definition, return a hash code for its name. */
408 const char *string = ((const struct md_constant *)def)->name;
410 for (result = i = 0;*string++ != '\0'; i++)
411 result += ((unsigned char) *string << (i % CHAR_BIT));
415 /* Given two constant definitions, return true if they have the same name. */
417 def_name_eq_p (def1, def2)
418 const void *def1, *def2;
420 return ! strcmp (((const struct md_constant *)def1)->name,
421 ((const struct md_constant *)def2)->name);
424 /* INFILE is a FILE pointer to read text from. TMP_CHAR is a buffer suitable
425 to read a name or number into. Process a define_constants directive,
426 starting with the optional space after the "define_constants". */
428 read_constants (infile, tmp_char)
435 c = read_skip_spaces (infile);
437 fatal_expected_char (infile, '[', c);
440 defs = htab_create (32, def_hash, def_name_eq_p, (htab_del) 0);
441 /* Disable constant expansion during definition processing. */
443 while ( (c = read_skip_spaces (infile)) != ']')
445 struct md_constant *def;
449 fatal_expected_char (infile, '(', c);
450 def = xmalloc (sizeof (struct md_constant));
451 def->name = tmp_char;
452 read_name (tmp_char, infile);
453 entry_ptr = htab_find_slot (defs, def, TRUE);
455 def->name = xstrdup (tmp_char);
456 c = read_skip_spaces (infile);
458 read_name (tmp_char, infile);
461 def->value = xstrdup (tmp_char);
467 if (strcmp (def->value, tmp_char))
468 fatal_with_file_and_line (infile,
469 "redefinition of %s, was %s, now %s",
470 def->name, def->value, tmp_char);
472 c = read_skip_spaces (infile);
474 fatal_expected_char (infile, ')', c);
477 c = read_skip_spaces (infile);
479 fatal_expected_char (infile, ')', c);
482 /* For every constant definition, call CALLBACK with two arguments:
483 a pointer a pointer to the constant definition and INFO.
484 Stops when CALLBACK returns zero. */
486 traverse_md_constants (callback, info)
491 htab_traverse (md_constants, callback, info);
494 /* Read an rtx in printed representation from INFILE
495 and return an actual rtx in core constructed accordingly.
496 read_rtx is not used in the compiler proper, but rather in
497 the utilities gen*.c that construct C code from machine descriptions. */
505 register const char *format_ptr;
506 /* tmp_char is a buffer used for reading decimal integers
507 and names of rtx types and machine modes.
508 Therefore, 256 must be enough. */
513 HOST_WIDE_INT tmp_wide;
515 /* Obstack used for allocating RTL objects. */
516 static struct obstack rtl_obstack;
517 static int initialized;
519 /* Linked list structure for making RTXs: */
522 struct rtx_list *next;
523 rtx value; /* Value of this node. */
527 obstack_init (&rtl_obstack);
532 c = read_skip_spaces (infile); /* Should be open paren. */
534 fatal_expected_char (infile, '(', c);
536 read_name (tmp_char, infile);
540 if (! strcmp (tmp_char, "define_constants"))
542 read_constants (infile, tmp_char);
545 for (i = 0; i < NUM_RTX_CODE; i++)
546 if (! strcmp (tmp_char, GET_RTX_NAME (i)))
548 tmp_code = (RTX_CODE) i; /* get value for name */
552 if (tmp_code == UNKNOWN)
553 fatal_with_file_and_line (infile, "unknown rtx code `%s'", tmp_char);
555 /* (NIL) stands for an expression that isn't there. */
558 /* Discard the closeparen. */
559 while ((c = getc (infile)) && c != ')')
565 /* If we end up with an insn expression then we free this space below. */
566 return_rtx = rtx_alloc (tmp_code);
567 format_ptr = GET_RTX_FORMAT (GET_CODE (return_rtx));
569 /* If what follows is `: mode ', read it and
570 store the mode in the rtx. */
572 i = read_skip_spaces (infile);
575 read_name (tmp_char, infile);
576 for (j = 0; j < NUM_MACHINE_MODES; j++)
577 if (! strcmp (GET_MODE_NAME (j), tmp_char))
580 if (j == MAX_MACHINE_MODE)
581 fatal_with_file_and_line (infile, "unknown mode `%s'", tmp_char);
583 PUT_MODE (return_rtx, (enum machine_mode) j);
588 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (return_rtx)); i++)
589 switch (*format_ptr++)
591 /* 0 means a field for internal use only.
592 Don't expect it to be present in the input. */
598 XEXP (return_rtx, i) = read_rtx (infile);
602 /* 'V' is an optional vector: if a closeparen follows,
603 just store NULL for this element. */
604 c = read_skip_spaces (infile);
608 XVEC (return_rtx, i) = 0;
611 /* Now process the vector. */
615 /* Obstack to store scratch vector in. */
616 struct obstack vector_stack;
617 int list_counter = 0;
618 rtvec return_vec = NULL_RTVEC;
620 c = read_skip_spaces (infile);
622 fatal_expected_char (infile, '[', c);
624 /* add expressions to a list, while keeping a count */
625 obstack_init (&vector_stack);
626 while ((c = read_skip_spaces (infile)) && c != ']')
630 obstack_ptr_grow (&vector_stack, (PTR) read_rtx (infile));
632 if (list_counter > 0)
634 return_vec = rtvec_alloc (list_counter);
635 memcpy (&return_vec->elem[0], obstack_finish (&vector_stack),
636 list_counter * sizeof (rtx));
638 XVEC (return_rtx, i) = return_vec;
639 obstack_free (&vector_stack, NULL);
640 /* close bracket gotten */
645 /* 'S' is an optional string: if a closeparen follows,
646 just store NULL for this element. */
647 c = read_skip_spaces (infile);
651 XSTR (return_rtx, i) = 0;
660 /* The output template slot of a DEFINE_INSN,
661 DEFINE_INSN_AND_SPLIT, or DEFINE_PEEPHOLE automatically
662 gets a star inserted as its first character, if it is
663 written with a brace block instead of a string constant. */
664 int star_if_braced = (format_ptr[-1] == 'T');
666 stringbuf = read_string (&rtl_obstack, infile, star_if_braced);
668 /* For insn patterns, we want to provide a default name
669 based on the file and line, like "*foo.md:12", if the
670 given name is blank. These are only for define_insn and
671 define_insn_and_split, to aid debugging. */
672 if (*stringbuf == '\0'
674 && (GET_CODE (return_rtx) == DEFINE_INSN
675 || GET_CODE (return_rtx) == DEFINE_INSN_AND_SPLIT))
678 const char *fn = (read_rtx_filename ? read_rtx_filename : "rtx");
680 for (slash = fn; *slash; slash ++)
681 if (*slash == '/' || *slash == '\\' || *slash == ':')
683 obstack_1grow (&rtl_obstack, '*');
684 obstack_grow (&rtl_obstack, fn, strlen (fn));
685 sprintf (line_name, ":%d", read_rtx_lineno);
686 obstack_grow (&rtl_obstack, line_name, strlen (line_name)+1);
687 stringbuf = (char *) obstack_finish (&rtl_obstack);
691 XTMPL (return_rtx, i) = stringbuf;
693 XSTR (return_rtx, i) = stringbuf;
698 read_name (tmp_char, infile);
699 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
700 tmp_wide = atoi (tmp_char);
702 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
703 tmp_wide = atol (tmp_char);
705 /* Prefer atoll over atoq, since the former is in the ISO C99 standard.
706 But prefer not to use our hand-rolled function above either. */
707 #if defined(HAVE_ATOLL) || !defined(HAVE_ATOQ)
708 tmp_wide = atoll (tmp_char);
710 tmp_wide = atoq (tmp_char);
714 XWINT (return_rtx, i) = tmp_wide;
719 read_name (tmp_char, infile);
720 tmp_int = atoi (tmp_char);
721 XINT (return_rtx, i) = tmp_int;
726 "switch format wrong in rtl.read_rtx(). format was: %c.\n",
728 fprintf (stderr, "\tfile position: %ld\n", ftell (infile));
732 c = read_skip_spaces (infile);
734 fatal_expected_char (infile, ')', c);