1 /* CPP Library - traditional lexical analysis and macro expansion.
2 Copyright (C) 2002 Free Software Foundation, Inc.
3 Contributed by Neil Booth, May 2002
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option) any
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24 /* The replacement text of a function-like macro is stored as a
25 contiguous sequence of aligned blocks, each representing the text
26 between subsequent parameters.
28 Each block comprises the text between its surrounding parameters,
29 the length of that text, and the one-based index of the following
30 parameter. The final block in the replacement text is easily
31 recognizable as it has an argument index of zero. */
35 unsigned int text_len
;
36 unsigned short arg_index
;
40 #define BLOCK_HEADER_LEN offsetof (struct block, text)
41 #define BLOCK_LEN(TEXT_LEN) CPP_ALIGN (BLOCK_HEADER_LEN + (TEXT_LEN))
43 /* Structure holding information about a function-like macro
47 /* Memory buffer holding the trad_arg array. */
50 /* An array of size the number of macro parameters + 1, containing
51 the offsets of the start of each macro argument in the output
52 buffer. The argument continues until the character before the
53 start of the next one. */
56 /* The hashnode of the macro. */
59 /* The offset of the macro name in the output buffer. */
62 /* The line the macro name appeared on. */
65 /* Zero-based index of argument being currently lexed. */
69 /* Lexing state. It is mostly used to prevent macro expansion. */
70 enum ls
{ls_none
= 0, /* Normal state. */
71 ls_fun_open
, /* When looking for '('. */
72 ls_fun_close
, /* When looking for ')'. */
73 ls_defined
, /* After defined. */
74 ls_defined_close
, /* Looking for ')' of defined(). */
75 ls_hash
, /* After # in preprocessor conditional. */
76 ls_predicate
, /* After the predicate, maybe paren? */
77 ls_answer
}; /* In answer to predicate. */
79 /* Lexing TODO: Maybe handle space in escaped newlines. Stop cpplex.c
80 from recognizing comments and directives during its lexing pass. */
82 static const uchar
*skip_whitespace (cpp_reader
*, const uchar
*, int);
83 static cpp_hashnode
*lex_identifier (cpp_reader
*, const uchar
*);
84 static const uchar
*copy_comment (cpp_reader
*, const uchar
*, int);
85 static void check_output_buffer (cpp_reader
*, size_t);
86 static void push_replacement_text (cpp_reader
*, cpp_hashnode
*);
87 static bool scan_parameters (cpp_reader
*, cpp_macro
*);
88 static bool recursive_macro (cpp_reader
*, cpp_hashnode
*);
89 static void save_replacement_text (cpp_reader
*, cpp_macro
*, unsigned int);
90 static void maybe_start_funlike (cpp_reader
*, cpp_hashnode
*, const uchar
*,
92 static void save_argument (struct fun_macro
*, size_t);
93 static void replace_args_and_push (cpp_reader
*, struct fun_macro
*);
94 static size_t canonicalize_text (uchar
*, const uchar
*, size_t, uchar
*);
96 /* Ensures we have N bytes' space in the output buffer, and
97 reallocates it if not. */
99 check_output_buffer (cpp_reader
*pfile
, size_t n
)
101 /* We might need two bytes to terminate an unterminated comment, and
102 one more to terminate the line with a NUL. */
105 if (n
> (size_t) (pfile
->out
.limit
- pfile
->out
.cur
))
107 size_t size
= pfile
->out
.cur
- pfile
->out
.base
;
108 size_t new_size
= (size
+ n
) * 3 / 2;
110 pfile
->out
.base
= xrealloc (pfile
->out
.base
, new_size
);
111 pfile
->out
.limit
= pfile
->out
.base
+ new_size
;
112 pfile
->out
.cur
= pfile
->out
.base
+ size
;
116 /* Skip a C-style block comment in a macro as a result of -CC.
117 Buffer->cur points to the initial asterisk of the comment. */
119 skip_macro_block_comment (cpp_reader
*pfile
)
121 const uchar
*cur
= pfile
->buffer
->cur
;
127 /* People like decorating comments with '*', so check for '/'
128 instead for efficiency. */
129 while(! (*cur
++ == '/' && cur
[-2] == '*') )
132 pfile
->buffer
->cur
= cur
;
135 /* CUR points to the asterisk introducing a comment in the current
136 context. IN_DEFINE is true if we are in the replacement text of a
139 The asterisk and following comment is copied to the buffer pointed
140 to by pfile->out.cur, which must be of sufficient size.
141 Unterminated comments are diagnosed, and correctly terminated in
142 the output. pfile->out.cur is updated depending upon IN_DEFINE,
143 -C, -CC and pfile->state.in_directive.
145 Returns a pointer to the first character after the comment in the
148 copy_comment (cpp_reader
*pfile
, const uchar
*cur
, int in_define
)
150 bool unterminated
, copy
= false;
151 unsigned int from_line
= pfile
->line
;
152 cpp_buffer
*buffer
= pfile
->buffer
;
155 if (pfile
->context
->prev
)
156 unterminated
= false, skip_macro_block_comment (pfile
);
158 unterminated
= _cpp_skip_block_comment (pfile
);
161 cpp_error_with_line (pfile
, DL_ERROR
, from_line
, 0,
162 "unterminated comment");
164 /* Comments in directives become spaces so that tokens are properly
165 separated when the ISO preprocessor re-lexes the line. The
166 exception is #define. */
167 if (pfile
->state
.in_directive
)
171 if (CPP_OPTION (pfile
, discard_comments_in_macro_exp
))
177 pfile
->out
.cur
[-1] = ' ';
179 else if (CPP_OPTION (pfile
, discard_comments
))
186 size_t len
= (size_t) (buffer
->cur
- cur
);
187 memcpy (pfile
->out
.cur
, cur
, len
);
188 pfile
->out
.cur
+= len
;
191 *pfile
->out
.cur
++ = '*';
192 *pfile
->out
.cur
++ = '/';
199 /* CUR points to any character in the input buffer. Skips over all
200 contiguous horizontal white space and NULs, including comments if
201 SKIP_COMMENTS, until reaching the first non-horizontal-whitespace
202 character or the end of the current context. Escaped newlines are
205 The whitespace is copied verbatim to the output buffer, except that
206 comments are handled as described in copy_comment().
207 pfile->out.cur is updated.
209 Returns a pointer to the first character after the whitespace in
212 skip_whitespace (cpp_reader
*pfile
, const uchar
*cur
, int skip_comments
)
214 uchar
*out
= pfile
->out
.cur
;
218 unsigned int c
= *cur
++;
224 if (c
== '/' && *cur
== '*' && skip_comments
)
226 pfile
->out
.cur
= out
;
227 cur
= copy_comment (pfile
, cur
, false /* in_define */);
228 out
= pfile
->out
.cur
;
236 pfile
->out
.cur
= out
;
240 /* Lexes and outputs an identifier starting at CUR, which is assumed
241 to point to a valid first character of an identifier. Returns
242 the hashnode, and updates out.cur. */
243 static cpp_hashnode
*
244 lex_identifier (cpp_reader
*pfile
, const uchar
*cur
)
247 uchar
*out
= pfile
->out
.cur
;
248 cpp_hashnode
*result
;
252 while (is_numchar (*cur
));
254 CUR (pfile
->context
) = cur
;
255 len
= out
- pfile
->out
.cur
;
256 result
= (cpp_hashnode
*) ht_lookup (pfile
->hash_table
, pfile
->out
.cur
,
258 pfile
->out
.cur
= out
;
262 /* Overlays the true file buffer temporarily with text of length LEN
263 starting at START. The true buffer is restored upon calling
266 _cpp_overlay_buffer (cpp_reader
*pfile
, const uchar
*start
, size_t len
)
268 cpp_buffer
*buffer
= pfile
->buffer
;
270 pfile
->overlaid_buffer
= buffer
;
271 buffer
->saved_cur
= buffer
->cur
;
272 buffer
->saved_rlimit
= buffer
->rlimit
;
273 /* Prevent the ISO lexer from scanning a fresh line. */
274 pfile
->saved_line
= pfile
->line
--;
275 buffer
->need_line
= false;
278 buffer
->rlimit
= start
+ len
;
281 /* Restores a buffer overlaid by _cpp_overlay_buffer(). */
283 _cpp_remove_overlay (cpp_reader
*pfile
)
285 cpp_buffer
*buffer
= pfile
->overlaid_buffer
;
287 buffer
->cur
= buffer
->saved_cur
;
288 buffer
->rlimit
= buffer
->saved_rlimit
;
289 buffer
->need_line
= true;
291 pfile
->overlaid_buffer
= NULL
;
292 pfile
->line
= pfile
->saved_line
;
295 /* Reads a logical line into the output buffer. Returns TRUE if there
296 is more text left in the buffer. */
298 _cpp_read_logical_line_trad (cpp_reader
*pfile
)
302 if ((pfile
->buffer
== NULL
|| pfile
->buffer
->need_line
)
303 && !_cpp_get_fresh_line (pfile
))
306 while (!_cpp_scan_out_logical_line (pfile
, NULL
) || pfile
->state
.skipping
);
311 /* Set up state for finding the opening '(' of a function-like
314 maybe_start_funlike (cpp_reader
*pfile
, cpp_hashnode
*node
, const uchar
*start
, struct fun_macro
*macro
)
316 unsigned int n
= node
->value
.macro
->paramc
+ 1;
319 _cpp_release_buff (pfile
, macro
->buff
);
320 macro
->buff
= _cpp_get_buff (pfile
, n
* sizeof (size_t));
321 macro
->args
= (size_t *) BUFF_FRONT (macro
->buff
);
323 macro
->offset
= start
- pfile
->out
.base
;
327 /* Save the OFFSET of the start of the next argument to MACRO. */
329 save_argument (struct fun_macro
*macro
, size_t offset
)
332 if (macro
->argc
<= macro
->node
->value
.macro
->paramc
)
333 macro
->args
[macro
->argc
] = offset
;
336 /* Copies the next logical line in the current buffer (starting at
337 buffer->cur) to the output buffer. The output is guaranteed to
338 terminate with a NUL character. buffer->cur is updated.
340 If MACRO is non-NULL, then we are scanning the replacement list of
341 MACRO, and we call save_replacement_text() every time we meet an
344 _cpp_scan_out_logical_line (cpp_reader
*pfile
, cpp_macro
*macro
)
347 cpp_context
*context
;
350 struct fun_macro fmacro
;
351 unsigned int c
, paren_depth
= 0, quote
;
352 enum ls lex_state
= ls_none
;
358 header_ok
= pfile
->state
.angled_headers
;
359 CUR (pfile
->context
) = pfile
->buffer
->cur
;
360 RLIMIT (pfile
->context
) = pfile
->buffer
->rlimit
;
361 pfile
->out
.cur
= pfile
->out
.base
;
362 pfile
->out
.first_line
= pfile
->line
;
364 context
= pfile
->context
;
366 check_output_buffer (pfile
, RLIMIT (context
) - cur
);
367 out
= pfile
->out
.cur
;
372 && cur
>= pfile
->buffer
->notes
[pfile
->buffer
->cur_note
].pos
)
374 pfile
->buffer
->cur
= cur
;
375 _cpp_process_line_notes (pfile
, false);
380 /* Whitespace should "continue" out of the switch,
381 non-whitespace should "break" out of it. */
392 /* If this is a macro's expansion, pop it. */
395 pfile
->out
.cur
= out
- 1;
396 _cpp_pop_context (pfile
);
400 /* Omit the newline from the output buffer. */
401 pfile
->out
.cur
= out
- 1;
402 pfile
->buffer
->cur
= cur
;
403 pfile
->buffer
->need_line
= true;
406 if ((lex_state
== ls_fun_open
|| lex_state
== ls_fun_close
)
407 && !pfile
->state
.in_directive
408 && _cpp_get_fresh_line (pfile
))
410 /* Newlines in arguments become a space, but we don't
411 clear any in-progress quote. */
412 if (lex_state
== ls_fun_close
)
414 cur
= pfile
->buffer
->cur
;
437 /* Skip escaped quotes here, it's easier than above. */
438 if (*cur
== '\\' || *cur
== '"' || *cur
== '\'')
443 /* Traditional CPP does not recognize comments within
445 if (!quote
&& *cur
== '*')
447 pfile
->out
.cur
= out
;
448 cur
= copy_comment (pfile
, cur
, macro
!= 0);
449 out
= pfile
->out
.cur
;
455 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
456 case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
457 case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
458 case 's': case 't': case 'u': case 'v': case 'w': case 'x':
460 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
461 case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
462 case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
463 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
465 if (!pfile
->state
.skipping
&& (quote
== 0 || macro
))
468 uchar
*out_start
= out
- 1;
470 pfile
->out
.cur
= out_start
;
471 node
= lex_identifier (pfile
, cur
- 1);
472 out
= pfile
->out
.cur
;
475 if (node
->type
== NT_MACRO
476 /* Should we expand for ls_answer? */
477 && (lex_state
== ls_none
|| lex_state
== ls_fun_open
)
478 && !pfile
->state
.prevent_expansion
)
480 /* Macros invalidate MI optimization. */
481 pfile
->mi_valid
= false;
482 if (! (node
->flags
& NODE_BUILTIN
)
483 && node
->value
.macro
->fun_like
)
485 maybe_start_funlike (pfile
, node
, out_start
, &fmacro
);
486 lex_state
= ls_fun_open
;
487 fmacro
.line
= pfile
->line
;
490 else if (!recursive_macro (pfile
, node
))
492 /* Remove the object-like macro's name from the
493 output, and push its replacement text. */
494 pfile
->out
.cur
= out_start
;
495 push_replacement_text (pfile
, node
);
500 else if (macro
&& (node
->flags
& NODE_MACRO_ARG
) != 0)
502 /* Found a parameter in the replacement text of a
503 #define. Remove its name from the output. */
504 pfile
->out
.cur
= out_start
;
505 save_replacement_text (pfile
, macro
, node
->value
.arg_index
);
506 out
= pfile
->out
.base
;
508 else if (lex_state
== ls_hash
)
510 lex_state
= ls_predicate
;
513 else if (pfile
->state
.in_expression
514 && node
== pfile
->spec_nodes
.n_defined
)
516 lex_state
= ls_defined
;
526 if (lex_state
== ls_fun_open
)
528 if (recursive_macro (pfile
, fmacro
.node
))
532 lex_state
= ls_fun_close
;
534 out
= pfile
->out
.base
+ fmacro
.offset
;
535 fmacro
.args
[0] = fmacro
.offset
;
538 else if (lex_state
== ls_predicate
)
539 lex_state
= ls_answer
;
540 else if (lex_state
== ls_defined
)
541 lex_state
= ls_defined_close
;
546 if (quote
== 0 && lex_state
== ls_fun_close
&& paren_depth
== 1)
547 save_argument (&fmacro
, out
- pfile
->out
.base
);
554 if (lex_state
== ls_fun_close
&& paren_depth
== 0)
556 cpp_macro
*m
= fmacro
.node
->value
.macro
;
560 save_argument (&fmacro
, out
- pfile
->out
.base
);
562 /* A single zero-length argument is no argument. */
565 && out
== pfile
->out
.base
+ fmacro
.offset
+ 1)
568 if (_cpp_arguments_ok (pfile
, m
, fmacro
.node
, fmacro
.argc
))
570 /* Remove the macro's invocation from the
571 output, and push its replacement text. */
572 pfile
->out
.cur
= (pfile
->out
.base
575 replace_args_and_push (pfile
, &fmacro
);
579 else if (lex_state
== ls_answer
|| lex_state
== ls_defined_close
)
585 if (out
- 1 == pfile
->out
.base
586 /* A '#' from a macro doesn't start a directive. */
587 && !pfile
->context
->prev
588 && !pfile
->state
.in_directive
)
590 /* A directive. With the way _cpp_handle_directive
591 currently works, we only want to call it if either we
592 know the directive is OK, or we want it to fail and
593 be removed from the output. If we want it to be
594 passed through (the assembler case) then we must not
595 call _cpp_handle_directive. */
596 pfile
->out
.cur
= out
;
597 cur
= skip_whitespace (pfile
, cur
, true /* skip_comments */);
598 out
= pfile
->out
.cur
;
602 /* Null directive. Ignore it and don't invalidate
603 the MI optimization. */
604 pfile
->buffer
->need_line
= true;
613 if (is_numstart (*cur
)
614 && CPP_OPTION (pfile
, lang
) != CLK_ASM
)
616 else if (is_idstart (*cur
))
617 /* Check whether we know this directive, but don't
619 do_it
= lex_identifier (pfile
, cur
)->is_directive
;
621 if (do_it
|| CPP_OPTION (pfile
, lang
) != CLK_ASM
)
623 /* This is a kludge. We want to have the ISO
624 preprocessor lex the next token. */
625 pfile
->buffer
->cur
= cur
;
626 _cpp_handle_directive (pfile
, false /* indented */);
633 if (pfile
->state
.in_expression
)
644 /* Non-whitespace disables MI optimization and stops treating
645 '<' as a quote in #include. */
647 if (!pfile
->state
.in_directive
)
648 pfile
->mi_valid
= false;
650 if (lex_state
== ls_none
)
653 /* Some of these transitions of state are syntax errors. The
654 ISO preprocessor will issue errors later. */
655 if (lex_state
== ls_fun_open
)
658 else if (lex_state
== ls_hash
659 || lex_state
== ls_predicate
660 || lex_state
== ls_defined
)
663 /* ls_answer and ls_defined_close keep going until ')'. */
668 _cpp_release_buff (pfile
, fmacro
.buff
);
670 if (lex_state
== ls_fun_close
)
671 cpp_error_with_line (pfile
, DL_ERROR
, fmacro
.line
, 0,
672 "unterminated argument list invoking macro \"%s\"",
673 NODE_NAME (fmacro
.node
));
677 /* Push a context holding the replacement text of the macro NODE on
678 the context stack. NODE is either object-like, or a function-like
679 macro with no arguments. */
681 push_replacement_text (cpp_reader
*pfile
, cpp_hashnode
*node
)
687 if (node
->flags
& NODE_BUILTIN
)
689 text
= _cpp_builtin_macro_text (pfile
, node
);
690 len
= ustrlen (text
);
691 buf
= _cpp_unaligned_alloc (pfile
, len
+ 1);
692 memcpy (buf
, text
, len
);
698 cpp_macro
*macro
= node
->value
.macro
;
700 text
= macro
->exp
.text
;
704 _cpp_push_text_context (pfile
, node
, text
, len
);
707 /* Returns TRUE if traditional macro recursion is detected. */
709 recursive_macro (cpp_reader
*pfile
, cpp_hashnode
*node
)
711 bool recursing
= !!(node
->flags
& NODE_DISABLED
);
713 /* Object-like macros that are already expanding are necessarily
716 However, it is possible to have traditional function-like macros
717 that are not infinitely recursive but recurse to any given depth.
718 Further, it is easy to construct examples that get ever longer
719 until the point they stop recursing. So there is no easy way to
720 detect true recursion; instead we assume any expansion more than
721 20 deep since the first invocation of this macro must be
723 if (recursing
&& node
->value
.macro
->fun_like
)
726 cpp_context
*context
= pfile
->context
;
731 if (context
->macro
== node
&& depth
> 20)
733 context
= context
->prev
;
736 recursing
= context
!= NULL
;
740 cpp_error (pfile
, DL_ERROR
,
741 "detected recursion whilst expanding macro \"%s\"",
747 /* Return the length of the replacement text of a function-like or
748 object-like non-builtin macro. */
750 _cpp_replacement_text_len (const cpp_macro
*macro
)
754 if (macro
->fun_like
&& (macro
->paramc
!= 0))
759 for (exp
= macro
->exp
.text
;;)
761 struct block
*b
= (struct block
*) exp
;
764 if (b
->arg_index
== 0)
766 len
+= NODE_LEN (macro
->params
[b
->arg_index
- 1]);
767 exp
+= BLOCK_LEN (b
->text_len
);
776 /* Copy the replacement text of MACRO to DEST, which must be of
777 sufficient size. It is not NUL-terminated. The next character is
780 _cpp_copy_replacement_text (const cpp_macro
*macro
, uchar
*dest
)
782 if (macro
->fun_like
&& (macro
->paramc
!= 0))
786 for (exp
= macro
->exp
.text
;;)
788 struct block
*b
= (struct block
*) exp
;
791 memcpy (dest
, b
->text
, b
->text_len
);
793 if (b
->arg_index
== 0)
795 param
= macro
->params
[b
->arg_index
- 1];
796 memcpy (dest
, NODE_NAME (param
), NODE_LEN (param
));
797 dest
+= NODE_LEN (param
);
798 exp
+= BLOCK_LEN (b
->text_len
);
803 memcpy (dest
, macro
->exp
.text
, macro
->count
);
804 dest
+= macro
->count
;
810 /* Push a context holding the replacement text of the macro NODE on
811 the context stack. NODE is either object-like, or a function-like
812 macro with no arguments. */
814 replace_args_and_push (cpp_reader
*pfile
, struct fun_macro
*fmacro
)
816 cpp_macro
*macro
= fmacro
->node
->value
.macro
;
818 if (macro
->paramc
== 0)
819 push_replacement_text (pfile
, fmacro
->node
);
827 /* Calculate the length of the argument-replaced text. */
828 for (exp
= macro
->exp
.text
;;)
830 struct block
*b
= (struct block
*) exp
;
833 if (b
->arg_index
== 0)
835 len
+= (fmacro
->args
[b
->arg_index
]
836 - fmacro
->args
[b
->arg_index
- 1] - 1);
837 exp
+= BLOCK_LEN (b
->text_len
);
840 /* Allocate room for the expansion plus \n. */
841 buff
= _cpp_get_buff (pfile
, len
+ 1);
843 /* Copy the expansion and replace arguments. */
844 p
= BUFF_FRONT (buff
);
845 for (exp
= macro
->exp
.text
;;)
847 struct block
*b
= (struct block
*) exp
;
850 memcpy (p
, b
->text
, b
->text_len
);
852 if (b
->arg_index
== 0)
854 arglen
= (fmacro
->args
[b
->arg_index
]
855 - fmacro
->args
[b
->arg_index
- 1] - 1);
856 memcpy (p
, pfile
->out
.base
+ fmacro
->args
[b
->arg_index
- 1],
859 exp
+= BLOCK_LEN (b
->text_len
);
864 _cpp_push_text_context (pfile
, fmacro
->node
, BUFF_FRONT (buff
), len
);
866 /* So we free buffer allocation when macro is left. */
867 pfile
->context
->buff
= buff
;
871 /* Read and record the parameters, if any, of a function-like macro
872 definition. Destroys pfile->out.cur.
874 Returns true on success, false on failure (syntax error or a
875 duplicate parameter). On success, CUR (pfile->context) is just
876 past the closing parenthesis. */
878 scan_parameters (cpp_reader
*pfile
, cpp_macro
*macro
)
880 const uchar
*cur
= CUR (pfile
->context
) + 1;
885 cur
= skip_whitespace (pfile
, cur
, true /* skip_comments */);
887 if (is_idstart (*cur
))
890 if (_cpp_save_parameter (pfile
, macro
, lex_identifier (pfile
, cur
)))
892 cur
= skip_whitespace (pfile
, CUR (pfile
->context
),
893 true /* skip_comments */);
903 ok
= (*cur
== ')' && macro
->paramc
== 0);
907 CUR (pfile
->context
) = cur
+ (*cur
== ')');
912 /* Save the text from pfile->out.base to pfile->out.cur as
913 the replacement text for the current macro, followed by argument
914 ARG_INDEX, with zero indicating the end of the replacement
917 save_replacement_text (cpp_reader
*pfile
, cpp_macro
*macro
,
918 unsigned int arg_index
)
920 size_t len
= pfile
->out
.cur
- pfile
->out
.base
;
923 if (macro
->paramc
== 0)
925 /* Object-like and function-like macros without parameters
926 simply store their \n-terminated replacement text. */
927 exp
= _cpp_unaligned_alloc (pfile
, len
+ 1);
928 memcpy (exp
, pfile
->out
.base
, len
);
930 macro
->exp
.text
= exp
;
935 /* Store the text's length (unsigned int), the argument index
936 (unsigned short, base 1) and then the text. */
937 size_t blen
= BLOCK_LEN (len
);
940 if (macro
->count
+ blen
> BUFF_ROOM (pfile
->a_buff
))
941 _cpp_extend_buff (pfile
, &pfile
->a_buff
, macro
->count
+ blen
);
943 exp
= BUFF_FRONT (pfile
->a_buff
);
944 block
= (struct block
*) (exp
+ macro
->count
);
945 macro
->exp
.text
= exp
;
947 /* Write out the block information. */
948 block
->text_len
= len
;
949 block
->arg_index
= arg_index
;
950 memcpy (block
->text
, pfile
->out
.base
, len
);
952 /* Lex the rest into the start of the output buffer. */
953 pfile
->out
.cur
= pfile
->out
.base
;
955 macro
->count
+= blen
;
957 /* If we've finished, commit the memory. */
959 BUFF_FRONT (pfile
->a_buff
) += macro
->count
;
963 /* Analyze and save the replacement text of a macro. Returns true on
966 _cpp_create_trad_definition (cpp_reader
*pfile
, cpp_macro
*macro
)
970 cpp_context
*context
= pfile
->context
;
972 /* The context has not been set up for command line defines, and CUR
973 has not been updated for the macro name for in-file defines. */
974 pfile
->out
.cur
= pfile
->out
.base
;
975 CUR (context
) = pfile
->buffer
->cur
;
976 RLIMIT (context
) = pfile
->buffer
->rlimit
;
977 check_output_buffer (pfile
, RLIMIT (context
) - CUR (context
));
979 /* Is this a function-like macro? */
980 if (* CUR (context
) == '(')
982 /* Setting macro to NULL indicates an error occurred, and
983 prevents unnecessary work in _cpp_scan_out_logical_line. */
984 if (!scan_parameters (pfile
, macro
))
988 /* Success. Commit the parameter array. */
989 macro
->params
= (cpp_hashnode
**) BUFF_FRONT (pfile
->a_buff
);
990 BUFF_FRONT (pfile
->a_buff
) = (uchar
*) ¯o
->params
[macro
->paramc
];
995 /* Skip leading whitespace in the replacement text. */
997 = skip_whitespace (pfile
, CUR (context
),
998 CPP_OPTION (pfile
, discard_comments_in_macro_exp
));
1000 pfile
->state
.prevent_expansion
++;
1001 _cpp_scan_out_logical_line (pfile
, macro
);
1002 pfile
->state
.prevent_expansion
--;
1007 /* Skip trailing white space. */
1008 cur
= pfile
->out
.base
;
1009 limit
= pfile
->out
.cur
;
1010 while (limit
> cur
&& is_space (limit
[-1]))
1012 pfile
->out
.cur
= limit
;
1013 save_replacement_text (pfile
, macro
, 0);
1018 /* Copy SRC of length LEN to DEST, but convert all contiguous
1019 whitespace to a single space, provided it is not in quotes. The
1020 quote currently in effect is pointed to by PQUOTE, and is updated
1021 by the function. Returns the number of bytes copied. */
1023 canonicalize_text (uchar
*dest
, const uchar
*src
, size_t len
, uchar
*pquote
)
1025 uchar
*orig_dest
= dest
;
1026 uchar quote
= *pquote
;
1030 if (is_space (*src
) && !quote
)
1034 while (len
&& is_space (*src
));
1039 if (*src
== '\'' || *src
== '"')
1043 else if (quote
== *src
)
1046 *dest
++ = *src
++, len
--;
1051 return dest
- orig_dest
;
1054 /* Returns true if MACRO1 and MACRO2 have expansions different other
1055 than in the form of their whitespace. */
1057 _cpp_expansions_different_trad (const cpp_macro
*macro1
,
1058 const cpp_macro
*macro2
)
1060 uchar
*p1
= xmalloc (macro1
->count
+ macro2
->count
);
1061 uchar
*p2
= p1
+ macro1
->count
;
1062 uchar quote1
= 0, quote2
= 0;
1066 if (macro1
->paramc
> 0)
1068 const uchar
*exp1
= macro1
->exp
.text
, *exp2
= macro2
->exp
.text
;
1073 struct block
*b1
= (struct block
*) exp1
;
1074 struct block
*b2
= (struct block
*) exp2
;
1076 if (b1
->arg_index
!= b2
->arg_index
)
1079 len1
= canonicalize_text (p1
, b1
->text
, b1
->text_len
, "e1
);
1080 len2
= canonicalize_text (p2
, b2
->text
, b2
->text_len
, "e2
);
1081 if (len1
!= len2
|| memcmp (p1
, p2
, len1
))
1083 if (b1
->arg_index
== 0)
1088 exp1
+= BLOCK_LEN (b1
->text_len
);
1089 exp2
+= BLOCK_LEN (b2
->text_len
);
1094 len1
= canonicalize_text (p1
, macro1
->exp
.text
, macro1
->count
, "e1
);
1095 len2
= canonicalize_text (p2
, macro2
->exp
.text
, macro2
->count
, "e2
);
1096 mismatch
= (len1
!= len2
|| memcmp (p1
, p2
, len1
));