2018-05-24 Steven G. Kargl <kargl@gcc.gnu.org>
[official-gcc.git] / libcpp / lex.c
blob37c365a3560bcd758ccf69375b43a26f52d38a41
1 /* CPP Library - lexical analysis.
2 Copyright (C) 2000-2018 Free Software Foundation, Inc.
3 Contributed by Per Bothner, 1994-95.
4 Based on CCCP program by Paul Rubin, June 1986
5 Adapted to ANSI C, Richard Stallman, Jan 1987
6 Broken out to separate file, Zack Weinberg, Mar 2000
8 This program is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 3, or (at your option) any
11 later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 #include "config.h"
23 #include "system.h"
24 #include "cpplib.h"
25 #include "internal.h"
27 enum spell_type
29 SPELL_OPERATOR = 0,
30 SPELL_IDENT,
31 SPELL_LITERAL,
32 SPELL_NONE
35 struct token_spelling
37 enum spell_type category;
38 const unsigned char *name;
41 static const unsigned char *const digraph_spellings[] =
42 { UC"%:", UC"%:%:", UC"<:", UC":>", UC"<%", UC"%>" };
44 #define OP(e, s) { SPELL_OPERATOR, UC s },
45 #define TK(e, s) { SPELL_ ## s, UC #e },
46 static const struct token_spelling token_spellings[N_TTYPES] = { TTYPE_TABLE };
47 #undef OP
48 #undef TK
50 #define TOKEN_SPELL(token) (token_spellings[(token)->type].category)
51 #define TOKEN_NAME(token) (token_spellings[(token)->type].name)
53 static void add_line_note (cpp_buffer *, const uchar *, unsigned int);
54 static int skip_line_comment (cpp_reader *);
55 static void skip_whitespace (cpp_reader *, cppchar_t);
56 static void lex_string (cpp_reader *, cpp_token *, const uchar *);
57 static void save_comment (cpp_reader *, cpp_token *, const uchar *, cppchar_t);
58 static void store_comment (cpp_reader *, cpp_token *);
59 static void create_literal (cpp_reader *, cpp_token *, const uchar *,
60 unsigned int, enum cpp_ttype);
61 static bool warn_in_comment (cpp_reader *, _cpp_line_note *);
62 static int name_p (cpp_reader *, const cpp_string *);
63 static tokenrun *next_tokenrun (tokenrun *);
65 static _cpp_buff *new_buff (size_t);
68 /* Utility routine:
70 Compares, the token TOKEN to the NUL-terminated string STRING.
71 TOKEN must be a CPP_NAME. Returns 1 for equal, 0 for unequal. */
72 int
73 cpp_ideq (const cpp_token *token, const char *string)
75 if (token->type != CPP_NAME)
76 return 0;
78 return !ustrcmp (NODE_NAME (token->val.node.node), (const uchar *) string);
81 /* Record a note TYPE at byte POS into the current cleaned logical
82 line. */
83 static void
84 add_line_note (cpp_buffer *buffer, const uchar *pos, unsigned int type)
86 if (buffer->notes_used == buffer->notes_cap)
88 buffer->notes_cap = buffer->notes_cap * 2 + 200;
89 buffer->notes = XRESIZEVEC (_cpp_line_note, buffer->notes,
90 buffer->notes_cap);
93 buffer->notes[buffer->notes_used].pos = pos;
94 buffer->notes[buffer->notes_used].type = type;
95 buffer->notes_used++;
99 /* Fast path to find line special characters using optimized character
100 scanning algorithms. Anything complicated falls back to the slow
101 path below. Since this loop is very hot it's worth doing these kinds
102 of optimizations.
104 One of the paths through the ifdefs should provide
106 const uchar *search_line_fast (const uchar *s, const uchar *end);
108 Between S and END, search for \n, \r, \\, ?. Return a pointer to
109 the found character.
111 Note that the last character of the buffer is *always* a newline,
112 as forced by _cpp_convert_input. This fact can be used to avoid
113 explicitly looking for the end of the buffer. */
115 /* Configure gives us an ifdef test. */
116 #ifndef WORDS_BIGENDIAN
117 #define WORDS_BIGENDIAN 0
118 #endif
120 /* We'd like the largest integer that fits into a register. There's nothing
121 in <stdint.h> that gives us that. For most hosts this is unsigned long,
122 but MS decided on an LLP64 model. Thankfully when building with GCC we
123 can get the "real" word size. */
124 #ifdef __GNUC__
125 typedef unsigned int word_type __attribute__((__mode__(__word__)));
126 #else
127 typedef unsigned long word_type;
128 #endif
130 /* The code below is only expecting sizes 4 or 8.
131 Die at compile-time if this expectation is violated. */
132 typedef char check_word_type_size
133 [(sizeof(word_type) == 8 || sizeof(word_type) == 4) * 2 - 1];
135 /* Return X with the first N bytes forced to values that won't match one
136 of the interesting characters. Note that NUL is not interesting. */
138 static inline word_type
139 acc_char_mask_misalign (word_type val, unsigned int n)
141 word_type mask = -1;
142 if (WORDS_BIGENDIAN)
143 mask >>= n * 8;
144 else
145 mask <<= n * 8;
146 return val & mask;
149 /* Return X replicated to all byte positions within WORD_TYPE. */
151 static inline word_type
152 acc_char_replicate (uchar x)
154 word_type ret;
156 ret = (x << 24) | (x << 16) | (x << 8) | x;
157 if (sizeof(word_type) == 8)
158 ret = (ret << 16 << 16) | ret;
159 return ret;
162 /* Return non-zero if some byte of VAL is (probably) C. */
164 static inline word_type
165 acc_char_cmp (word_type val, word_type c)
167 #if defined(__GNUC__) && defined(__alpha__)
168 /* We can get exact results using a compare-bytes instruction.
169 Get (val == c) via (0 >= (val ^ c)). */
170 return __builtin_alpha_cmpbge (0, val ^ c);
171 #else
172 word_type magic = 0x7efefefeU;
173 if (sizeof(word_type) == 8)
174 magic = (magic << 16 << 16) | 0xfefefefeU;
175 magic |= 1;
177 val ^= c;
178 return ((val + magic) ^ ~val) & ~magic;
179 #endif
182 /* Given the result of acc_char_cmp is non-zero, return the index of
183 the found character. If this was a false positive, return -1. */
185 static inline int
186 acc_char_index (word_type cmp ATTRIBUTE_UNUSED,
187 word_type val ATTRIBUTE_UNUSED)
189 #if defined(__GNUC__) && defined(__alpha__) && !WORDS_BIGENDIAN
190 /* The cmpbge instruction sets *bits* of the result corresponding to
191 matches in the bytes with no false positives. */
192 return __builtin_ctzl (cmp);
193 #else
194 unsigned int i;
196 /* ??? It would be nice to force unrolling here,
197 and have all of these constants folded. */
198 for (i = 0; i < sizeof(word_type); ++i)
200 uchar c;
201 if (WORDS_BIGENDIAN)
202 c = (val >> (sizeof(word_type) - i - 1) * 8) & 0xff;
203 else
204 c = (val >> i * 8) & 0xff;
206 if (c == '\n' || c == '\r' || c == '\\' || c == '?')
207 return i;
210 return -1;
211 #endif
214 /* A version of the fast scanner using bit fiddling techniques.
216 For 32-bit words, one would normally perform 16 comparisons and
217 16 branches. With this algorithm one performs 24 arithmetic
218 operations and one branch. Whether this is faster with a 32-bit
219 word size is going to be somewhat system dependent.
221 For 64-bit words, we eliminate twice the number of comparisons
222 and branches without increasing the number of arithmetic operations.
223 It's almost certainly going to be a win with 64-bit word size. */
225 static const uchar * search_line_acc_char (const uchar *, const uchar *)
226 ATTRIBUTE_UNUSED;
228 static const uchar *
229 search_line_acc_char (const uchar *s, const uchar *end ATTRIBUTE_UNUSED)
231 const word_type repl_nl = acc_char_replicate ('\n');
232 const word_type repl_cr = acc_char_replicate ('\r');
233 const word_type repl_bs = acc_char_replicate ('\\');
234 const word_type repl_qm = acc_char_replicate ('?');
236 unsigned int misalign;
237 const word_type *p;
238 word_type val, t;
240 /* Align the buffer. Mask out any bytes from before the beginning. */
241 p = (word_type *)((uintptr_t)s & -sizeof(word_type));
242 val = *p;
243 misalign = (uintptr_t)s & (sizeof(word_type) - 1);
244 if (misalign)
245 val = acc_char_mask_misalign (val, misalign);
247 /* Main loop. */
248 while (1)
250 t = acc_char_cmp (val, repl_nl);
251 t |= acc_char_cmp (val, repl_cr);
252 t |= acc_char_cmp (val, repl_bs);
253 t |= acc_char_cmp (val, repl_qm);
255 if (__builtin_expect (t != 0, 0))
257 int i = acc_char_index (t, val);
258 if (i >= 0)
259 return (const uchar *)p + i;
262 val = *++p;
266 /* Disable on Solaris 2/x86 until the following problem can be properly
267 autoconfed:
269 The Solaris 10+ assembler tags objects with the instruction set
270 extensions used, so SSE4.2 executables cannot run on machines that
271 don't support that extension. */
273 #if (GCC_VERSION >= 4005) && (__GNUC__ >= 5 || !defined(__PIC__)) && (defined(__i386__) || defined(__x86_64__)) && !(defined(__sun__) && defined(__svr4__))
275 /* Replicated character data to be shared between implementations.
276 Recall that outside of a context with vector support we can't
277 define compatible vector types, therefore these are all defined
278 in terms of raw characters. */
279 static const char repl_chars[4][16] __attribute__((aligned(16))) = {
280 { '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n',
281 '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n' },
282 { '\r', '\r', '\r', '\r', '\r', '\r', '\r', '\r',
283 '\r', '\r', '\r', '\r', '\r', '\r', '\r', '\r' },
284 { '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\',
285 '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\' },
286 { '?', '?', '?', '?', '?', '?', '?', '?',
287 '?', '?', '?', '?', '?', '?', '?', '?' },
290 /* A version of the fast scanner using MMX vectorized byte compare insns.
292 This uses the PMOVMSKB instruction which was introduced with "MMX2",
293 which was packaged into SSE1; it is also present in the AMD MMX
294 extension. Mark the function as using "sse" so that we emit a real
295 "emms" instruction, rather than the 3dNOW "femms" instruction. */
297 static const uchar *
298 #ifndef __SSE__
299 __attribute__((__target__("sse")))
300 #endif
301 search_line_mmx (const uchar *s, const uchar *end ATTRIBUTE_UNUSED)
303 typedef char v8qi __attribute__ ((__vector_size__ (8)));
304 typedef int __m64 __attribute__ ((__vector_size__ (8), __may_alias__));
306 const v8qi repl_nl = *(const v8qi *)repl_chars[0];
307 const v8qi repl_cr = *(const v8qi *)repl_chars[1];
308 const v8qi repl_bs = *(const v8qi *)repl_chars[2];
309 const v8qi repl_qm = *(const v8qi *)repl_chars[3];
311 unsigned int misalign, found, mask;
312 const v8qi *p;
313 v8qi data, t, c;
315 /* Align the source pointer. While MMX doesn't generate unaligned data
316 faults, this allows us to safely scan to the end of the buffer without
317 reading beyond the end of the last page. */
318 misalign = (uintptr_t)s & 7;
319 p = (const v8qi *)((uintptr_t)s & -8);
320 data = *p;
322 /* Create a mask for the bytes that are valid within the first
323 16-byte block. The Idea here is that the AND with the mask
324 within the loop is "free", since we need some AND or TEST
325 insn in order to set the flags for the branch anyway. */
326 mask = -1u << misalign;
328 /* Main loop processing 8 bytes at a time. */
329 goto start;
332 data = *++p;
333 mask = -1;
335 start:
336 t = __builtin_ia32_pcmpeqb(data, repl_nl);
337 c = __builtin_ia32_pcmpeqb(data, repl_cr);
338 t = (v8qi) __builtin_ia32_por ((__m64)t, (__m64)c);
339 c = __builtin_ia32_pcmpeqb(data, repl_bs);
340 t = (v8qi) __builtin_ia32_por ((__m64)t, (__m64)c);
341 c = __builtin_ia32_pcmpeqb(data, repl_qm);
342 t = (v8qi) __builtin_ia32_por ((__m64)t, (__m64)c);
343 found = __builtin_ia32_pmovmskb (t);
344 found &= mask;
346 while (!found);
348 __builtin_ia32_emms ();
350 /* FOUND contains 1 in bits for which we matched a relevant
351 character. Conversion to the byte index is trivial. */
352 found = __builtin_ctz(found);
353 return (const uchar *)p + found;
356 /* A version of the fast scanner using SSE2 vectorized byte compare insns. */
358 static const uchar *
359 #ifndef __SSE2__
360 __attribute__((__target__("sse2")))
361 #endif
362 search_line_sse2 (const uchar *s, const uchar *end ATTRIBUTE_UNUSED)
364 typedef char v16qi __attribute__ ((__vector_size__ (16)));
366 const v16qi repl_nl = *(const v16qi *)repl_chars[0];
367 const v16qi repl_cr = *(const v16qi *)repl_chars[1];
368 const v16qi repl_bs = *(const v16qi *)repl_chars[2];
369 const v16qi repl_qm = *(const v16qi *)repl_chars[3];
371 unsigned int misalign, found, mask;
372 const v16qi *p;
373 v16qi data, t;
375 /* Align the source pointer. */
376 misalign = (uintptr_t)s & 15;
377 p = (const v16qi *)((uintptr_t)s & -16);
378 data = *p;
380 /* Create a mask for the bytes that are valid within the first
381 16-byte block. The Idea here is that the AND with the mask
382 within the loop is "free", since we need some AND or TEST
383 insn in order to set the flags for the branch anyway. */
384 mask = -1u << misalign;
386 /* Main loop processing 16 bytes at a time. */
387 goto start;
390 data = *++p;
391 mask = -1;
393 start:
394 t = __builtin_ia32_pcmpeqb128(data, repl_nl);
395 t |= __builtin_ia32_pcmpeqb128(data, repl_cr);
396 t |= __builtin_ia32_pcmpeqb128(data, repl_bs);
397 t |= __builtin_ia32_pcmpeqb128(data, repl_qm);
398 found = __builtin_ia32_pmovmskb128 (t);
399 found &= mask;
401 while (!found);
403 /* FOUND contains 1 in bits for which we matched a relevant
404 character. Conversion to the byte index is trivial. */
405 found = __builtin_ctz(found);
406 return (const uchar *)p + found;
409 #ifdef HAVE_SSE4
410 /* A version of the fast scanner using SSE 4.2 vectorized string insns. */
412 static const uchar *
413 #ifndef __SSE4_2__
414 __attribute__((__target__("sse4.2")))
415 #endif
416 search_line_sse42 (const uchar *s, const uchar *end)
418 typedef char v16qi __attribute__ ((__vector_size__ (16)));
419 static const v16qi search = { '\n', '\r', '?', '\\' };
421 uintptr_t si = (uintptr_t)s;
422 uintptr_t index;
424 /* Check for unaligned input. */
425 if (si & 15)
427 v16qi sv;
429 if (__builtin_expect (end - s < 16, 0)
430 && __builtin_expect ((si & 0xfff) > 0xff0, 0))
432 /* There are less than 16 bytes left in the buffer, and less
433 than 16 bytes left on the page. Reading 16 bytes at this
434 point might generate a spurious page fault. Defer to the
435 SSE2 implementation, which already handles alignment. */
436 return search_line_sse2 (s, end);
439 /* ??? The builtin doesn't understand that the PCMPESTRI read from
440 memory need not be aligned. */
441 sv = __builtin_ia32_loaddqu ((const char *) s);
442 index = __builtin_ia32_pcmpestri128 (search, 4, sv, 16, 0);
444 if (__builtin_expect (index < 16, 0))
445 goto found;
447 /* Advance the pointer to an aligned address. We will re-scan a
448 few bytes, but we no longer need care for reading past the
449 end of a page, since we're guaranteed a match. */
450 s = (const uchar *)((si + 15) & -16);
453 /* Main loop, processing 16 bytes at a time. */
454 #ifdef __GCC_ASM_FLAG_OUTPUTS__
455 while (1)
457 char f;
459 /* By using inline assembly instead of the builtin,
460 we can use the result, as well as the flags set. */
461 __asm ("%vpcmpestri\t$0, %2, %3"
462 : "=c"(index), "=@ccc"(f)
463 : "m"(*s), "x"(search), "a"(4), "d"(16));
464 if (f)
465 break;
467 s += 16;
469 #else
470 s -= 16;
471 /* By doing the whole loop in inline assembly,
472 we can make proper use of the flags set. */
473 __asm ( ".balign 16\n"
474 "0: add $16, %1\n"
475 " %vpcmpestri\t$0, (%1), %2\n"
476 " jnc 0b"
477 : "=&c"(index), "+r"(s)
478 : "x"(search), "a"(4), "d"(16));
479 #endif
481 found:
482 return s + index;
485 #else
486 /* Work around out-dated assemblers without sse4 support. */
487 #define search_line_sse42 search_line_sse2
488 #endif
490 /* Check the CPU capabilities. */
492 #include "../gcc/config/i386/cpuid.h"
494 typedef const uchar * (*search_line_fast_type) (const uchar *, const uchar *);
495 static search_line_fast_type search_line_fast;
497 #define HAVE_init_vectorized_lexer 1
498 static inline void
499 init_vectorized_lexer (void)
501 unsigned dummy, ecx = 0, edx = 0;
502 search_line_fast_type impl = search_line_acc_char;
503 int minimum = 0;
505 #if defined(__SSE4_2__)
506 minimum = 3;
507 #elif defined(__SSE2__)
508 minimum = 2;
509 #elif defined(__SSE__)
510 minimum = 1;
511 #endif
513 if (minimum == 3)
514 impl = search_line_sse42;
515 else if (__get_cpuid (1, &dummy, &dummy, &ecx, &edx) || minimum == 2)
517 if (minimum == 3 || (ecx & bit_SSE4_2))
518 impl = search_line_sse42;
519 else if (minimum == 2 || (edx & bit_SSE2))
520 impl = search_line_sse2;
521 else if (minimum == 1 || (edx & bit_SSE))
522 impl = search_line_mmx;
524 else if (__get_cpuid (0x80000001, &dummy, &dummy, &dummy, &edx))
526 if (minimum == 1
527 || (edx & (bit_MMXEXT | bit_CMOV)) == (bit_MMXEXT | bit_CMOV))
528 impl = search_line_mmx;
531 search_line_fast = impl;
534 #elif defined(_ARCH_PWR8) && defined(__ALTIVEC__)
536 /* A vection of the fast scanner using AltiVec vectorized byte compares
537 and VSX unaligned loads (when VSX is available). This is otherwise
538 the same as the pre-GCC 5 version. */
540 ATTRIBUTE_NO_SANITIZE_UNDEFINED
541 static const uchar *
542 search_line_fast (const uchar *s, const uchar *end ATTRIBUTE_UNUSED)
544 typedef __attribute__((altivec(vector))) unsigned char vc;
546 const vc repl_nl = {
547 '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n',
548 '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n'
550 const vc repl_cr = {
551 '\r', '\r', '\r', '\r', '\r', '\r', '\r', '\r',
552 '\r', '\r', '\r', '\r', '\r', '\r', '\r', '\r'
554 const vc repl_bs = {
555 '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\',
556 '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\'
558 const vc repl_qm = {
559 '?', '?', '?', '?', '?', '?', '?', '?',
560 '?', '?', '?', '?', '?', '?', '?', '?',
562 const vc zero = { 0 };
564 vc data, t;
566 /* Main loop processing 16 bytes at a time. */
569 vc m_nl, m_cr, m_bs, m_qm;
571 data = __builtin_vec_vsx_ld (0, s);
572 s += 16;
574 m_nl = (vc) __builtin_vec_cmpeq(data, repl_nl);
575 m_cr = (vc) __builtin_vec_cmpeq(data, repl_cr);
576 m_bs = (vc) __builtin_vec_cmpeq(data, repl_bs);
577 m_qm = (vc) __builtin_vec_cmpeq(data, repl_qm);
578 t = (m_nl | m_cr) | (m_bs | m_qm);
580 /* T now contains 0xff in bytes for which we matched one of the relevant
581 characters. We want to exit the loop if any byte in T is non-zero.
582 Below is the expansion of vec_any_ne(t, zero). */
584 while (!__builtin_vec_vcmpeq_p(/*__CR6_LT_REV*/3, t, zero));
586 /* Restore s to to point to the 16 bytes we just processed. */
587 s -= 16;
590 #define N (sizeof(vc) / sizeof(long))
592 union {
593 vc v;
594 /* Statically assert that N is 2 or 4. */
595 unsigned long l[(N == 2 || N == 4) ? N : -1];
596 } u;
597 unsigned long l, i = 0;
599 u.v = t;
601 /* Find the first word of T that is non-zero. */
602 switch (N)
604 case 4:
605 l = u.l[i++];
606 if (l != 0)
607 break;
608 s += sizeof(unsigned long);
609 l = u.l[i++];
610 if (l != 0)
611 break;
612 s += sizeof(unsigned long);
613 /* FALLTHRU */
614 case 2:
615 l = u.l[i++];
616 if (l != 0)
617 break;
618 s += sizeof(unsigned long);
619 l = u.l[i];
622 /* L now contains 0xff in bytes for which we matched one of the
623 relevant characters. We can find the byte index by finding
624 its bit index and dividing by 8. */
625 #ifdef __BIG_ENDIAN__
626 l = __builtin_clzl(l) >> 3;
627 #else
628 l = __builtin_ctzl(l) >> 3;
629 #endif
630 return s + l;
632 #undef N
636 #elif (GCC_VERSION >= 4005) && defined(__ALTIVEC__) && defined (__BIG_ENDIAN__)
638 /* A vection of the fast scanner using AltiVec vectorized byte compares.
639 This cannot be used for little endian because vec_lvsl/lvsr are
640 deprecated for little endian and the code won't work properly. */
641 /* ??? Unfortunately, attribute(target("altivec")) is not yet supported,
642 so we can't compile this function without -maltivec on the command line
643 (or implied by some other switch). */
645 static const uchar *
646 search_line_fast (const uchar *s, const uchar *end ATTRIBUTE_UNUSED)
648 typedef __attribute__((altivec(vector))) unsigned char vc;
650 const vc repl_nl = {
651 '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n',
652 '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n'
654 const vc repl_cr = {
655 '\r', '\r', '\r', '\r', '\r', '\r', '\r', '\r',
656 '\r', '\r', '\r', '\r', '\r', '\r', '\r', '\r'
658 const vc repl_bs = {
659 '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\',
660 '\\', '\\', '\\', '\\', '\\', '\\', '\\', '\\'
662 const vc repl_qm = {
663 '?', '?', '?', '?', '?', '?', '?', '?',
664 '?', '?', '?', '?', '?', '?', '?', '?',
666 const vc ones = {
667 -1, -1, -1, -1, -1, -1, -1, -1,
668 -1, -1, -1, -1, -1, -1, -1, -1,
670 const vc zero = { 0 };
672 vc data, mask, t;
674 /* Altivec loads automatically mask addresses with -16. This lets us
675 issue the first load as early as possible. */
676 data = __builtin_vec_ld(0, (const vc *)s);
678 /* Discard bytes before the beginning of the buffer. Do this by
679 beginning with all ones and shifting in zeros according to the
680 mis-alignment. The LVSR instruction pulls the exact shift we
681 want from the address. */
682 mask = __builtin_vec_lvsr(0, s);
683 mask = __builtin_vec_perm(zero, ones, mask);
684 data &= mask;
686 /* While altivec loads mask addresses, we still need to align S so
687 that the offset we compute at the end is correct. */
688 s = (const uchar *)((uintptr_t)s & -16);
690 /* Main loop processing 16 bytes at a time. */
691 goto start;
694 vc m_nl, m_cr, m_bs, m_qm;
696 s += 16;
697 data = __builtin_vec_ld(0, (const vc *)s);
699 start:
700 m_nl = (vc) __builtin_vec_cmpeq(data, repl_nl);
701 m_cr = (vc) __builtin_vec_cmpeq(data, repl_cr);
702 m_bs = (vc) __builtin_vec_cmpeq(data, repl_bs);
703 m_qm = (vc) __builtin_vec_cmpeq(data, repl_qm);
704 t = (m_nl | m_cr) | (m_bs | m_qm);
706 /* T now contains 0xff in bytes for which we matched one of the relevant
707 characters. We want to exit the loop if any byte in T is non-zero.
708 Below is the expansion of vec_any_ne(t, zero). */
710 while (!__builtin_vec_vcmpeq_p(/*__CR6_LT_REV*/3, t, zero));
713 #define N (sizeof(vc) / sizeof(long))
715 union {
716 vc v;
717 /* Statically assert that N is 2 or 4. */
718 unsigned long l[(N == 2 || N == 4) ? N : -1];
719 } u;
720 unsigned long l, i = 0;
722 u.v = t;
724 /* Find the first word of T that is non-zero. */
725 switch (N)
727 case 4:
728 l = u.l[i++];
729 if (l != 0)
730 break;
731 s += sizeof(unsigned long);
732 l = u.l[i++];
733 if (l != 0)
734 break;
735 s += sizeof(unsigned long);
736 /* FALLTHROUGH */
737 case 2:
738 l = u.l[i++];
739 if (l != 0)
740 break;
741 s += sizeof(unsigned long);
742 l = u.l[i];
745 /* L now contains 0xff in bytes for which we matched one of the
746 relevant characters. We can find the byte index by finding
747 its bit index and dividing by 8. */
748 l = __builtin_clzl(l) >> 3;
749 return s + l;
751 #undef N
755 #elif defined (__ARM_NEON) && defined (__ARM_64BIT_STATE)
756 #include "arm_neon.h"
758 /* This doesn't have to be the exact page size, but no system may use
759 a size smaller than this. ARMv8 requires a minimum page size of
760 4k. The impact of being conservative here is a small number of
761 cases will take the slightly slower entry path into the main
762 loop. */
764 #define AARCH64_MIN_PAGE_SIZE 4096
766 static const uchar *
767 search_line_fast (const uchar *s, const uchar *end ATTRIBUTE_UNUSED)
769 const uint8x16_t repl_nl = vdupq_n_u8 ('\n');
770 const uint8x16_t repl_cr = vdupq_n_u8 ('\r');
771 const uint8x16_t repl_bs = vdupq_n_u8 ('\\');
772 const uint8x16_t repl_qm = vdupq_n_u8 ('?');
773 const uint8x16_t xmask = (uint8x16_t) vdupq_n_u64 (0x8040201008040201ULL);
775 #ifdef __ARM_BIG_ENDIAN
776 const int16x8_t shift = {8, 8, 8, 8, 0, 0, 0, 0};
777 #else
778 const int16x8_t shift = {0, 0, 0, 0, 8, 8, 8, 8};
779 #endif
781 unsigned int found;
782 const uint8_t *p;
783 uint8x16_t data;
784 uint8x16_t t;
785 uint16x8_t m;
786 uint8x16_t u, v, w;
788 /* Align the source pointer. */
789 p = (const uint8_t *)((uintptr_t)s & -16);
791 /* Assuming random string start positions, with a 4k page size we'll take
792 the slow path about 0.37% of the time. */
793 if (__builtin_expect ((AARCH64_MIN_PAGE_SIZE
794 - (((uintptr_t) s) & (AARCH64_MIN_PAGE_SIZE - 1)))
795 < 16, 0))
797 /* Slow path: the string starts near a possible page boundary. */
798 uint32_t misalign, mask;
800 misalign = (uintptr_t)s & 15;
801 mask = (-1u << misalign) & 0xffff;
802 data = vld1q_u8 (p);
803 t = vceqq_u8 (data, repl_nl);
804 u = vceqq_u8 (data, repl_cr);
805 v = vorrq_u8 (t, vceqq_u8 (data, repl_bs));
806 w = vorrq_u8 (u, vceqq_u8 (data, repl_qm));
807 t = vorrq_u8 (v, w);
808 t = vandq_u8 (t, xmask);
809 m = vpaddlq_u8 (t);
810 m = vshlq_u16 (m, shift);
811 found = vaddvq_u16 (m);
812 found &= mask;
813 if (found)
814 return (const uchar*)p + __builtin_ctz (found);
816 else
818 data = vld1q_u8 ((const uint8_t *) s);
819 t = vceqq_u8 (data, repl_nl);
820 u = vceqq_u8 (data, repl_cr);
821 v = vorrq_u8 (t, vceqq_u8 (data, repl_bs));
822 w = vorrq_u8 (u, vceqq_u8 (data, repl_qm));
823 t = vorrq_u8 (v, w);
824 if (__builtin_expect (vpaddd_u64 ((uint64x2_t)t) != 0, 0))
825 goto done;
830 p += 16;
831 data = vld1q_u8 (p);
832 t = vceqq_u8 (data, repl_nl);
833 u = vceqq_u8 (data, repl_cr);
834 v = vorrq_u8 (t, vceqq_u8 (data, repl_bs));
835 w = vorrq_u8 (u, vceqq_u8 (data, repl_qm));
836 t = vorrq_u8 (v, w);
837 } while (!vpaddd_u64 ((uint64x2_t)t));
839 done:
840 /* Now that we've found the terminating substring, work out precisely where
841 we need to stop. */
842 t = vandq_u8 (t, xmask);
843 m = vpaddlq_u8 (t);
844 m = vshlq_u16 (m, shift);
845 found = vaddvq_u16 (m);
846 return (((((uintptr_t) p) < (uintptr_t) s) ? s : (const uchar *)p)
847 + __builtin_ctz (found));
850 #elif defined (__ARM_NEON)
851 #include "arm_neon.h"
853 static const uchar *
854 search_line_fast (const uchar *s, const uchar *end ATTRIBUTE_UNUSED)
856 const uint8x16_t repl_nl = vdupq_n_u8 ('\n');
857 const uint8x16_t repl_cr = vdupq_n_u8 ('\r');
858 const uint8x16_t repl_bs = vdupq_n_u8 ('\\');
859 const uint8x16_t repl_qm = vdupq_n_u8 ('?');
860 const uint8x16_t xmask = (uint8x16_t) vdupq_n_u64 (0x8040201008040201ULL);
862 unsigned int misalign, found, mask;
863 const uint8_t *p;
864 uint8x16_t data;
866 /* Align the source pointer. */
867 misalign = (uintptr_t)s & 15;
868 p = (const uint8_t *)((uintptr_t)s & -16);
869 data = vld1q_u8 (p);
871 /* Create a mask for the bytes that are valid within the first
872 16-byte block. The Idea here is that the AND with the mask
873 within the loop is "free", since we need some AND or TEST
874 insn in order to set the flags for the branch anyway. */
875 mask = (-1u << misalign) & 0xffff;
877 /* Main loop, processing 16 bytes at a time. */
878 goto start;
882 uint8x8_t l;
883 uint16x4_t m;
884 uint32x2_t n;
885 uint8x16_t t, u, v, w;
887 p += 16;
888 data = vld1q_u8 (p);
889 mask = 0xffff;
891 start:
892 t = vceqq_u8 (data, repl_nl);
893 u = vceqq_u8 (data, repl_cr);
894 v = vorrq_u8 (t, vceqq_u8 (data, repl_bs));
895 w = vorrq_u8 (u, vceqq_u8 (data, repl_qm));
896 t = vandq_u8 (vorrq_u8 (v, w), xmask);
897 l = vpadd_u8 (vget_low_u8 (t), vget_high_u8 (t));
898 m = vpaddl_u8 (l);
899 n = vpaddl_u16 (m);
901 found = vget_lane_u32 ((uint32x2_t) vorr_u64 ((uint64x1_t) n,
902 vshr_n_u64 ((uint64x1_t) n, 24)), 0);
903 found &= mask;
905 while (!found);
907 /* FOUND contains 1 in bits for which we matched a relevant
908 character. Conversion to the byte index is trivial. */
909 found = __builtin_ctz (found);
910 return (const uchar *)p + found;
913 #else
915 /* We only have one accelerated alternative. Use a direct call so that
916 we encourage inlining. */
918 #define search_line_fast search_line_acc_char
920 #endif
922 /* Initialize the lexer if needed. */
924 void
925 _cpp_init_lexer (void)
927 #ifdef HAVE_init_vectorized_lexer
928 init_vectorized_lexer ();
929 #endif
932 /* Returns with a logical line that contains no escaped newlines or
933 trigraphs. This is a time-critical inner loop. */
934 void
935 _cpp_clean_line (cpp_reader *pfile)
937 cpp_buffer *buffer;
938 const uchar *s;
939 uchar c, *d, *p;
941 buffer = pfile->buffer;
942 buffer->cur_note = buffer->notes_used = 0;
943 buffer->cur = buffer->line_base = buffer->next_line;
944 buffer->need_line = false;
945 s = buffer->next_line;
947 if (!buffer->from_stage3)
949 const uchar *pbackslash = NULL;
951 /* Fast path. This is the common case of an un-escaped line with
952 no trigraphs. The primary win here is by not writing any
953 data back to memory until we have to. */
954 while (1)
956 /* Perform an optimized search for \n, \r, \\, ?. */
957 s = search_line_fast (s, buffer->rlimit);
959 c = *s;
960 if (c == '\\')
962 /* Record the location of the backslash and continue. */
963 pbackslash = s++;
965 else if (__builtin_expect (c == '?', 0))
967 if (__builtin_expect (s[1] == '?', false)
968 && _cpp_trigraph_map[s[2]])
970 /* Have a trigraph. We may or may not have to convert
971 it. Add a line note regardless, for -Wtrigraphs. */
972 add_line_note (buffer, s, s[2]);
973 if (CPP_OPTION (pfile, trigraphs))
975 /* We do, and that means we have to switch to the
976 slow path. */
977 d = (uchar *) s;
978 *d = _cpp_trigraph_map[s[2]];
979 s += 2;
980 goto slow_path;
983 /* Not a trigraph. Continue on fast-path. */
984 s++;
986 else
987 break;
990 /* This must be \r or \n. We're either done, or we'll be forced
991 to write back to the buffer and continue on the slow path. */
992 d = (uchar *) s;
994 if (__builtin_expect (s == buffer->rlimit, false))
995 goto done;
997 /* DOS line ending? */
998 if (__builtin_expect (c == '\r', false) && s[1] == '\n')
1000 s++;
1001 if (s == buffer->rlimit)
1002 goto done;
1005 if (__builtin_expect (pbackslash == NULL, true))
1006 goto done;
1008 /* Check for escaped newline. */
1009 p = d;
1010 while (is_nvspace (p[-1]))
1011 p--;
1012 if (p - 1 != pbackslash)
1013 goto done;
1015 /* Have an escaped newline; process it and proceed to
1016 the slow path. */
1017 add_line_note (buffer, p - 1, p != d ? ' ' : '\\');
1018 d = p - 2;
1019 buffer->next_line = p - 1;
1021 slow_path:
1022 while (1)
1024 c = *++s;
1025 *++d = c;
1027 if (c == '\n' || c == '\r')
1029 /* Handle DOS line endings. */
1030 if (c == '\r' && s != buffer->rlimit && s[1] == '\n')
1031 s++;
1032 if (s == buffer->rlimit)
1033 break;
1035 /* Escaped? */
1036 p = d;
1037 while (p != buffer->next_line && is_nvspace (p[-1]))
1038 p--;
1039 if (p == buffer->next_line || p[-1] != '\\')
1040 break;
1042 add_line_note (buffer, p - 1, p != d ? ' ': '\\');
1043 d = p - 2;
1044 buffer->next_line = p - 1;
1046 else if (c == '?' && s[1] == '?' && _cpp_trigraph_map[s[2]])
1048 /* Add a note regardless, for the benefit of -Wtrigraphs. */
1049 add_line_note (buffer, d, s[2]);
1050 if (CPP_OPTION (pfile, trigraphs))
1052 *d = _cpp_trigraph_map[s[2]];
1053 s += 2;
1058 else
1060 while (*s != '\n' && *s != '\r')
1061 s++;
1062 d = (uchar *) s;
1064 /* Handle DOS line endings. */
1065 if (*s == '\r' && s != buffer->rlimit && s[1] == '\n')
1066 s++;
1069 done:
1070 *d = '\n';
1071 /* A sentinel note that should never be processed. */
1072 add_line_note (buffer, d + 1, '\n');
1073 buffer->next_line = s + 1;
1076 /* Return true if the trigraph indicated by NOTE should be warned
1077 about in a comment. */
1078 static bool
1079 warn_in_comment (cpp_reader *pfile, _cpp_line_note *note)
1081 const uchar *p;
1083 /* Within comments we don't warn about trigraphs, unless the
1084 trigraph forms an escaped newline, as that may change
1085 behavior. */
1086 if (note->type != '/')
1087 return false;
1089 /* If -trigraphs, then this was an escaped newline iff the next note
1090 is coincident. */
1091 if (CPP_OPTION (pfile, trigraphs))
1092 return note[1].pos == note->pos;
1094 /* Otherwise, see if this forms an escaped newline. */
1095 p = note->pos + 3;
1096 while (is_nvspace (*p))
1097 p++;
1099 /* There might have been escaped newlines between the trigraph and the
1100 newline we found. Hence the position test. */
1101 return (*p == '\n' && p < note[1].pos);
1104 /* Process the notes created by add_line_note as far as the current
1105 location. */
1106 void
1107 _cpp_process_line_notes (cpp_reader *pfile, int in_comment)
1109 cpp_buffer *buffer = pfile->buffer;
1111 for (;;)
1113 _cpp_line_note *note = &buffer->notes[buffer->cur_note];
1114 unsigned int col;
1116 if (note->pos > buffer->cur)
1117 break;
1119 buffer->cur_note++;
1120 col = CPP_BUF_COLUMN (buffer, note->pos + 1);
1122 if (note->type == '\\' || note->type == ' ')
1124 if (note->type == ' ' && !in_comment)
1125 cpp_error_with_line (pfile, CPP_DL_WARNING, pfile->line_table->highest_line, col,
1126 "backslash and newline separated by space");
1128 if (buffer->next_line > buffer->rlimit)
1130 cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->line_table->highest_line, col,
1131 "backslash-newline at end of file");
1132 /* Prevent "no newline at end of file" warning. */
1133 buffer->next_line = buffer->rlimit;
1136 buffer->line_base = note->pos;
1137 CPP_INCREMENT_LINE (pfile, 0);
1139 else if (_cpp_trigraph_map[note->type])
1141 if (CPP_OPTION (pfile, warn_trigraphs)
1142 && (!in_comment || warn_in_comment (pfile, note)))
1144 if (CPP_OPTION (pfile, trigraphs))
1145 cpp_warning_with_line (pfile, CPP_W_TRIGRAPHS,
1146 pfile->line_table->highest_line, col,
1147 "trigraph ??%c converted to %c",
1148 note->type,
1149 (int) _cpp_trigraph_map[note->type]);
1150 else
1152 cpp_warning_with_line
1153 (pfile, CPP_W_TRIGRAPHS,
1154 pfile->line_table->highest_line, col,
1155 "trigraph ??%c ignored, use -trigraphs to enable",
1156 note->type);
1160 else if (note->type == 0)
1161 /* Already processed in lex_raw_string. */;
1162 else
1163 abort ();
1167 /* Skip a C-style block comment. We find the end of the comment by
1168 seeing if an asterisk is before every '/' we encounter. Returns
1169 nonzero if comment terminated by EOF, zero otherwise.
1171 Buffer->cur points to the initial asterisk of the comment. */
1172 bool
1173 _cpp_skip_block_comment (cpp_reader *pfile)
1175 cpp_buffer *buffer = pfile->buffer;
1176 const uchar *cur = buffer->cur;
1177 uchar c;
1179 cur++;
1180 if (*cur == '/')
1181 cur++;
1183 for (;;)
1185 /* People like decorating comments with '*', so check for '/'
1186 instead for efficiency. */
1187 c = *cur++;
1189 if (c == '/')
1191 if (cur[-2] == '*')
1192 break;
1194 /* Warn about potential nested comments, but not if the '/'
1195 comes immediately before the true comment delimiter.
1196 Don't bother to get it right across escaped newlines. */
1197 if (CPP_OPTION (pfile, warn_comments)
1198 && cur[0] == '*' && cur[1] != '/')
1200 buffer->cur = cur;
1201 cpp_warning_with_line (pfile, CPP_W_COMMENTS,
1202 pfile->line_table->highest_line,
1203 CPP_BUF_COL (buffer),
1204 "\"/*\" within comment");
1207 else if (c == '\n')
1209 unsigned int cols;
1210 buffer->cur = cur - 1;
1211 _cpp_process_line_notes (pfile, true);
1212 if (buffer->next_line >= buffer->rlimit)
1213 return true;
1214 _cpp_clean_line (pfile);
1216 cols = buffer->next_line - buffer->line_base;
1217 CPP_INCREMENT_LINE (pfile, cols);
1219 cur = buffer->cur;
1223 buffer->cur = cur;
1224 _cpp_process_line_notes (pfile, true);
1225 return false;
1228 /* Skip a C++ line comment, leaving buffer->cur pointing to the
1229 terminating newline. Handles escaped newlines. Returns nonzero
1230 if a multiline comment. */
1231 static int
1232 skip_line_comment (cpp_reader *pfile)
1234 cpp_buffer *buffer = pfile->buffer;
1235 source_location orig_line = pfile->line_table->highest_line;
1237 while (*buffer->cur != '\n')
1238 buffer->cur++;
1240 _cpp_process_line_notes (pfile, true);
1241 return orig_line != pfile->line_table->highest_line;
1244 /* Skips whitespace, saving the next non-whitespace character. */
1245 static void
1246 skip_whitespace (cpp_reader *pfile, cppchar_t c)
1248 cpp_buffer *buffer = pfile->buffer;
1249 bool saw_NUL = false;
1253 /* Horizontal space always OK. */
1254 if (c == ' ' || c == '\t')
1256 /* Just \f \v or \0 left. */
1257 else if (c == '\0')
1258 saw_NUL = true;
1259 else if (pfile->state.in_directive && CPP_PEDANTIC (pfile))
1260 cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->line_table->highest_line,
1261 CPP_BUF_COL (buffer),
1262 "%s in preprocessing directive",
1263 c == '\f' ? "form feed" : "vertical tab");
1265 c = *buffer->cur++;
1267 /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */
1268 while (is_nvspace (c));
1270 if (saw_NUL)
1271 cpp_error (pfile, CPP_DL_WARNING, "null character(s) ignored");
1273 buffer->cur--;
1276 /* See if the characters of a number token are valid in a name (no
1277 '.', '+' or '-'). */
1278 static int
1279 name_p (cpp_reader *pfile, const cpp_string *string)
1281 unsigned int i;
1283 for (i = 0; i < string->len; i++)
1284 if (!is_idchar (string->text[i]))
1285 return 0;
1287 return 1;
1290 /* After parsing an identifier or other sequence, produce a warning about
1291 sequences not in NFC/NFKC. */
1292 static void
1293 warn_about_normalization (cpp_reader *pfile,
1294 const cpp_token *token,
1295 const struct normalize_state *s)
1297 if (CPP_OPTION (pfile, warn_normalize) < NORMALIZE_STATE_RESULT (s)
1298 && !pfile->state.skipping)
1300 /* Make sure that the token is printed using UCNs, even
1301 if we'd otherwise happily print UTF-8. */
1302 unsigned char *buf = XNEWVEC (unsigned char, cpp_token_len (token));
1303 size_t sz;
1305 sz = cpp_spell_token (pfile, token, buf, false) - buf;
1306 if (NORMALIZE_STATE_RESULT (s) == normalized_C)
1307 cpp_warning_with_line (pfile, CPP_W_NORMALIZE, token->src_loc, 0,
1308 "`%.*s' is not in NFKC", (int) sz, buf);
1309 else
1310 cpp_warning_with_line (pfile, CPP_W_NORMALIZE, token->src_loc, 0,
1311 "`%.*s' is not in NFC", (int) sz, buf);
1312 free (buf);
1316 /* Returns TRUE if the sequence starting at buffer->cur is invalid in
1317 an identifier. FIRST is TRUE if this starts an identifier. */
1318 static bool
1319 forms_identifier_p (cpp_reader *pfile, int first,
1320 struct normalize_state *state)
1322 cpp_buffer *buffer = pfile->buffer;
1324 if (*buffer->cur == '$')
1326 if (!CPP_OPTION (pfile, dollars_in_ident))
1327 return false;
1329 buffer->cur++;
1330 if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping)
1332 CPP_OPTION (pfile, warn_dollars) = 0;
1333 cpp_error (pfile, CPP_DL_PEDWARN, "'$' in identifier or number");
1336 return true;
1339 /* Is this a syntactically valid UCN? */
1340 if (CPP_OPTION (pfile, extended_identifiers)
1341 && *buffer->cur == '\\'
1342 && (buffer->cur[1] == 'u' || buffer->cur[1] == 'U'))
1344 cppchar_t s;
1345 buffer->cur += 2;
1346 if (_cpp_valid_ucn (pfile, &buffer->cur, buffer->rlimit, 1 + !first,
1347 state, &s, NULL, NULL))
1348 return true;
1349 buffer->cur -= 2;
1352 return false;
1355 /* Helper function to issue error about improper __VA_OPT__ use. */
1356 static void
1357 maybe_va_opt_error (cpp_reader *pfile)
1359 if (CPP_PEDANTIC (pfile) && !CPP_OPTION (pfile, va_opt))
1361 /* __VA_OPT__ should not be accepted at all, but allow it in
1362 system headers. */
1363 if (!cpp_in_system_header (pfile))
1364 cpp_error (pfile, CPP_DL_PEDWARN,
1365 "__VA_OPT__ is not available until C++2a");
1367 else if (!pfile->state.va_args_ok)
1369 /* __VA_OPT__ should only appear in the replacement list of a
1370 variadic macro. */
1371 cpp_error (pfile, CPP_DL_PEDWARN,
1372 "__VA_OPT__ can only appear in the expansion"
1373 " of a C++2a variadic macro");
1377 /* Helper function to get the cpp_hashnode of the identifier BASE. */
1378 static cpp_hashnode *
1379 lex_identifier_intern (cpp_reader *pfile, const uchar *base)
1381 cpp_hashnode *result;
1382 const uchar *cur;
1383 unsigned int len;
1384 unsigned int hash = HT_HASHSTEP (0, *base);
1386 cur = base + 1;
1387 while (ISIDNUM (*cur))
1389 hash = HT_HASHSTEP (hash, *cur);
1390 cur++;
1392 len = cur - base;
1393 hash = HT_HASHFINISH (hash, len);
1394 result = CPP_HASHNODE (ht_lookup_with_hash (pfile->hash_table,
1395 base, len, hash, HT_ALLOC));
1397 /* Rarely, identifiers require diagnostics when lexed. */
1398 if (__builtin_expect ((result->flags & NODE_DIAGNOSTIC)
1399 && !pfile->state.skipping, 0))
1401 /* It is allowed to poison the same identifier twice. */
1402 if ((result->flags & NODE_POISONED) && !pfile->state.poisoned_ok)
1403 cpp_error (pfile, CPP_DL_ERROR, "attempt to use poisoned \"%s\"",
1404 NODE_NAME (result));
1406 /* Constraint 6.10.3.5: __VA_ARGS__ should only appear in the
1407 replacement list of a variadic macro. */
1408 if (result == pfile->spec_nodes.n__VA_ARGS__
1409 && !pfile->state.va_args_ok)
1411 if (CPP_OPTION (pfile, cplusplus))
1412 cpp_error (pfile, CPP_DL_PEDWARN,
1413 "__VA_ARGS__ can only appear in the expansion"
1414 " of a C++11 variadic macro");
1415 else
1416 cpp_error (pfile, CPP_DL_PEDWARN,
1417 "__VA_ARGS__ can only appear in the expansion"
1418 " of a C99 variadic macro");
1421 if (result == pfile->spec_nodes.n__VA_OPT__)
1422 maybe_va_opt_error (pfile);
1424 /* For -Wc++-compat, warn about use of C++ named operators. */
1425 if (result->flags & NODE_WARN_OPERATOR)
1426 cpp_warning (pfile, CPP_W_CXX_OPERATOR_NAMES,
1427 "identifier \"%s\" is a special operator name in C++",
1428 NODE_NAME (result));
1431 return result;
1434 /* Get the cpp_hashnode of an identifier specified by NAME in
1435 the current cpp_reader object. If none is found, NULL is returned. */
1436 cpp_hashnode *
1437 _cpp_lex_identifier (cpp_reader *pfile, const char *name)
1439 cpp_hashnode *result;
1440 result = lex_identifier_intern (pfile, (uchar *) name);
1441 return result;
1444 /* Lex an identifier starting at BUFFER->CUR - 1. */
1445 static cpp_hashnode *
1446 lex_identifier (cpp_reader *pfile, const uchar *base, bool starts_ucn,
1447 struct normalize_state *nst, cpp_hashnode **spelling)
1449 cpp_hashnode *result;
1450 const uchar *cur;
1451 unsigned int len;
1452 unsigned int hash = HT_HASHSTEP (0, *base);
1454 cur = pfile->buffer->cur;
1455 if (! starts_ucn)
1457 while (ISIDNUM (*cur))
1459 hash = HT_HASHSTEP (hash, *cur);
1460 cur++;
1462 NORMALIZE_STATE_UPDATE_IDNUM (nst, *(cur - 1));
1464 pfile->buffer->cur = cur;
1465 if (starts_ucn || forms_identifier_p (pfile, false, nst))
1467 /* Slower version for identifiers containing UCNs (or $). */
1468 do {
1469 while (ISIDNUM (*pfile->buffer->cur))
1471 NORMALIZE_STATE_UPDATE_IDNUM (nst, *pfile->buffer->cur);
1472 pfile->buffer->cur++;
1474 } while (forms_identifier_p (pfile, false, nst));
1475 result = _cpp_interpret_identifier (pfile, base,
1476 pfile->buffer->cur - base);
1477 *spelling = cpp_lookup (pfile, base, pfile->buffer->cur - base);
1479 else
1481 len = cur - base;
1482 hash = HT_HASHFINISH (hash, len);
1484 result = CPP_HASHNODE (ht_lookup_with_hash (pfile->hash_table,
1485 base, len, hash, HT_ALLOC));
1486 *spelling = result;
1489 /* Rarely, identifiers require diagnostics when lexed. */
1490 if (__builtin_expect ((result->flags & NODE_DIAGNOSTIC)
1491 && !pfile->state.skipping, 0))
1493 /* It is allowed to poison the same identifier twice. */
1494 if ((result->flags & NODE_POISONED) && !pfile->state.poisoned_ok)
1495 cpp_error (pfile, CPP_DL_ERROR, "attempt to use poisoned \"%s\"",
1496 NODE_NAME (result));
1498 /* Constraint 6.10.3.5: __VA_ARGS__ should only appear in the
1499 replacement list of a variadic macro. */
1500 if (result == pfile->spec_nodes.n__VA_ARGS__
1501 && !pfile->state.va_args_ok)
1503 if (CPP_OPTION (pfile, cplusplus))
1504 cpp_error (pfile, CPP_DL_PEDWARN,
1505 "__VA_ARGS__ can only appear in the expansion"
1506 " of a C++11 variadic macro");
1507 else
1508 cpp_error (pfile, CPP_DL_PEDWARN,
1509 "__VA_ARGS__ can only appear in the expansion"
1510 " of a C99 variadic macro");
1513 /* __VA_OPT__ should only appear in the replacement list of a
1514 variadic macro. */
1515 if (result == pfile->spec_nodes.n__VA_OPT__)
1516 maybe_va_opt_error (pfile);
1518 /* For -Wc++-compat, warn about use of C++ named operators. */
1519 if (result->flags & NODE_WARN_OPERATOR)
1520 cpp_warning (pfile, CPP_W_CXX_OPERATOR_NAMES,
1521 "identifier \"%s\" is a special operator name in C++",
1522 NODE_NAME (result));
1525 return result;
1528 /* Lex a number to NUMBER starting at BUFFER->CUR - 1. */
1529 static void
1530 lex_number (cpp_reader *pfile, cpp_string *number,
1531 struct normalize_state *nst)
1533 const uchar *cur;
1534 const uchar *base;
1535 uchar *dest;
1537 base = pfile->buffer->cur - 1;
1540 cur = pfile->buffer->cur;
1542 /* N.B. ISIDNUM does not include $. */
1543 while (ISIDNUM (*cur) || *cur == '.' || DIGIT_SEP (*cur)
1544 || VALID_SIGN (*cur, cur[-1]))
1546 NORMALIZE_STATE_UPDATE_IDNUM (nst, *cur);
1547 cur++;
1549 /* A number can't end with a digit separator. */
1550 while (cur > pfile->buffer->cur && DIGIT_SEP (cur[-1]))
1551 --cur;
1553 pfile->buffer->cur = cur;
1555 while (forms_identifier_p (pfile, false, nst));
1557 number->len = cur - base;
1558 dest = _cpp_unaligned_alloc (pfile, number->len + 1);
1559 memcpy (dest, base, number->len);
1560 dest[number->len] = '\0';
1561 number->text = dest;
1564 /* Create a token of type TYPE with a literal spelling. */
1565 static void
1566 create_literal (cpp_reader *pfile, cpp_token *token, const uchar *base,
1567 unsigned int len, enum cpp_ttype type)
1569 uchar *dest = _cpp_unaligned_alloc (pfile, len + 1);
1571 memcpy (dest, base, len);
1572 dest[len] = '\0';
1573 token->type = type;
1574 token->val.str.len = len;
1575 token->val.str.text = dest;
1578 /* Subroutine of lex_raw_string: Append LEN chars from BASE to the buffer
1579 sequence from *FIRST_BUFF_P to LAST_BUFF_P. */
1581 static void
1582 bufring_append (cpp_reader *pfile, const uchar *base, size_t len,
1583 _cpp_buff **first_buff_p, _cpp_buff **last_buff_p)
1585 _cpp_buff *first_buff = *first_buff_p;
1586 _cpp_buff *last_buff = *last_buff_p;
1588 if (first_buff == NULL)
1589 first_buff = last_buff = _cpp_get_buff (pfile, len);
1590 else if (len > BUFF_ROOM (last_buff))
1592 size_t room = BUFF_ROOM (last_buff);
1593 memcpy (BUFF_FRONT (last_buff), base, room);
1594 BUFF_FRONT (last_buff) += room;
1595 base += room;
1596 len -= room;
1597 last_buff = _cpp_append_extend_buff (pfile, last_buff, len);
1600 memcpy (BUFF_FRONT (last_buff), base, len);
1601 BUFF_FRONT (last_buff) += len;
1603 *first_buff_p = first_buff;
1604 *last_buff_p = last_buff;
1608 /* Returns true if a macro has been defined.
1609 This might not work if compile with -save-temps,
1610 or preprocess separately from compilation. */
1612 static bool
1613 is_macro(cpp_reader *pfile, const uchar *base)
1615 const uchar *cur = base;
1616 if (! ISIDST (*cur))
1617 return false;
1618 unsigned int hash = HT_HASHSTEP (0, *cur);
1619 ++cur;
1620 while (ISIDNUM (*cur))
1622 hash = HT_HASHSTEP (hash, *cur);
1623 ++cur;
1625 hash = HT_HASHFINISH (hash, cur - base);
1627 cpp_hashnode *result = CPP_HASHNODE (ht_lookup_with_hash (pfile->hash_table,
1628 base, cur - base, hash, HT_NO_INSERT));
1630 return !result ? false : (result->type == NT_MACRO);
1633 /* Returns true if a literal suffix does not have the expected form
1634 and is defined as a macro. */
1636 static bool
1637 is_macro_not_literal_suffix(cpp_reader *pfile, const uchar *base)
1639 /* User-defined literals outside of namespace std must start with a single
1640 underscore, so assume anything of that form really is a UDL suffix.
1641 We don't need to worry about UDLs defined inside namespace std because
1642 their names are reserved, so cannot be used as macro names in valid
1643 programs. */
1644 if (base[0] == '_' && base[1] != '_')
1645 return false;
1646 return is_macro (pfile, base);
1649 /* Lexes a raw string. The stored string contains the spelling, including
1650 double quotes, delimiter string, '(' and ')', any leading
1651 'L', 'u', 'U' or 'u8' and 'R' modifier. It returns the type of the
1652 literal, or CPP_OTHER if it was not properly terminated.
1654 The spelling is NUL-terminated, but it is not guaranteed that this
1655 is the first NUL since embedded NULs are preserved. */
1657 static void
1658 lex_raw_string (cpp_reader *pfile, cpp_token *token, const uchar *base,
1659 const uchar *cur)
1661 uchar raw_prefix[17];
1662 uchar temp_buffer[18];
1663 const uchar *orig_base;
1664 unsigned int raw_prefix_len = 0, raw_suffix_len = 0;
1665 enum raw_str_phase { RAW_STR_PREFIX, RAW_STR, RAW_STR_SUFFIX };
1666 raw_str_phase phase = RAW_STR_PREFIX;
1667 enum cpp_ttype type;
1668 size_t total_len = 0;
1669 /* Index into temp_buffer during phases other than RAW_STR,
1670 during RAW_STR phase 17 to tell BUF_APPEND that nothing should
1671 be appended to temp_buffer. */
1672 size_t temp_buffer_len = 0;
1673 _cpp_buff *first_buff = NULL, *last_buff = NULL;
1674 size_t raw_prefix_start;
1675 _cpp_line_note *note = &pfile->buffer->notes[pfile->buffer->cur_note];
1677 type = (*base == 'L' ? CPP_WSTRING :
1678 *base == 'U' ? CPP_STRING32 :
1679 *base == 'u' ? (base[1] == '8' ? CPP_UTF8STRING : CPP_STRING16)
1680 : CPP_STRING);
1682 #define BUF_APPEND(STR,LEN) \
1683 do { \
1684 bufring_append (pfile, (const uchar *)(STR), (LEN), \
1685 &first_buff, &last_buff); \
1686 total_len += (LEN); \
1687 if (__builtin_expect (temp_buffer_len < 17, 0) \
1688 && (const uchar *)(STR) != base \
1689 && (LEN) <= 2) \
1691 memcpy (temp_buffer + temp_buffer_len, \
1692 (const uchar *)(STR), (LEN)); \
1693 temp_buffer_len += (LEN); \
1695 } while (0)
1697 orig_base = base;
1698 ++cur;
1699 raw_prefix_start = cur - base;
1700 for (;;)
1702 cppchar_t c;
1704 /* If we previously performed any trigraph or line splicing
1705 transformations, undo them in between the opening and closing
1706 double quote. */
1707 while (note->pos < cur)
1708 ++note;
1709 for (; note->pos == cur; ++note)
1711 switch (note->type)
1713 case '\\':
1714 case ' ':
1715 /* Restore backslash followed by newline. */
1716 BUF_APPEND (base, cur - base);
1717 base = cur;
1718 BUF_APPEND ("\\", 1);
1719 after_backslash:
1720 if (note->type == ' ')
1722 /* GNU backslash whitespace newline extension. FIXME
1723 could be any sequence of non-vertical space. When we
1724 can properly restore any such sequence, we should mark
1725 this note as handled so _cpp_process_line_notes
1726 doesn't warn. */
1727 BUF_APPEND (" ", 1);
1730 BUF_APPEND ("\n", 1);
1731 break;
1733 case 0:
1734 /* Already handled. */
1735 break;
1737 default:
1738 if (_cpp_trigraph_map[note->type])
1740 /* Don't warn about this trigraph in
1741 _cpp_process_line_notes, since trigraphs show up as
1742 trigraphs in raw strings. */
1743 uchar type = note->type;
1744 note->type = 0;
1746 if (!CPP_OPTION (pfile, trigraphs))
1747 /* If we didn't convert the trigraph in the first
1748 place, don't do anything now either. */
1749 break;
1751 BUF_APPEND (base, cur - base);
1752 base = cur;
1753 BUF_APPEND ("??", 2);
1755 /* ??/ followed by newline gets two line notes, one for
1756 the trigraph and one for the backslash/newline. */
1757 if (type == '/' && note[1].pos == cur)
1759 if (note[1].type != '\\'
1760 && note[1].type != ' ')
1761 abort ();
1762 BUF_APPEND ("/", 1);
1763 ++note;
1764 goto after_backslash;
1766 else
1768 /* Skip the replacement character. */
1769 base = ++cur;
1770 BUF_APPEND (&type, 1);
1771 c = type;
1772 goto check_c;
1775 else
1776 abort ();
1777 break;
1780 c = *cur++;
1781 if (__builtin_expect (temp_buffer_len < 17, 0))
1782 temp_buffer[temp_buffer_len++] = c;
1784 check_c:
1785 if (phase == RAW_STR_PREFIX)
1787 while (raw_prefix_len < temp_buffer_len)
1789 raw_prefix[raw_prefix_len] = temp_buffer[raw_prefix_len];
1790 switch (raw_prefix[raw_prefix_len])
1792 case ' ': case '(': case ')': case '\\': case '\t':
1793 case '\v': case '\f': case '\n': default:
1794 break;
1795 /* Basic source charset except the above chars. */
1796 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
1797 case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
1798 case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
1799 case 's': case 't': case 'u': case 'v': case 'w': case 'x':
1800 case 'y': case 'z':
1801 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
1802 case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
1803 case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
1804 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
1805 case 'Y': case 'Z':
1806 case '0': case '1': case '2': case '3': case '4': case '5':
1807 case '6': case '7': case '8': case '9':
1808 case '_': case '{': case '}': case '#': case '[': case ']':
1809 case '<': case '>': case '%': case ':': case ';': case '.':
1810 case '?': case '*': case '+': case '-': case '/': case '^':
1811 case '&': case '|': case '~': case '!': case '=': case ',':
1812 case '"': case '\'':
1813 if (raw_prefix_len < 16)
1815 raw_prefix_len++;
1816 continue;
1818 break;
1821 if (raw_prefix[raw_prefix_len] != '(')
1823 int col = CPP_BUF_COLUMN (pfile->buffer, cur) + 1;
1824 if (raw_prefix_len == 16)
1825 cpp_error_with_line (pfile, CPP_DL_ERROR, token->src_loc,
1826 col, "raw string delimiter longer "
1827 "than 16 characters");
1828 else if (raw_prefix[raw_prefix_len] == '\n')
1829 cpp_error_with_line (pfile, CPP_DL_ERROR, token->src_loc,
1830 col, "invalid new-line in raw "
1831 "string delimiter");
1832 else
1833 cpp_error_with_line (pfile, CPP_DL_ERROR, token->src_loc,
1834 col, "invalid character '%c' in "
1835 "raw string delimiter",
1836 (int) raw_prefix[raw_prefix_len]);
1837 pfile->buffer->cur = orig_base + raw_prefix_start - 1;
1838 create_literal (pfile, token, orig_base,
1839 raw_prefix_start - 1, CPP_OTHER);
1840 if (first_buff)
1841 _cpp_release_buff (pfile, first_buff);
1842 return;
1844 raw_prefix[raw_prefix_len] = '"';
1845 phase = RAW_STR;
1846 /* Nothing should be appended to temp_buffer during
1847 RAW_STR phase. */
1848 temp_buffer_len = 17;
1849 break;
1851 continue;
1853 else if (phase == RAW_STR_SUFFIX)
1855 while (raw_suffix_len <= raw_prefix_len
1856 && raw_suffix_len < temp_buffer_len
1857 && temp_buffer[raw_suffix_len] == raw_prefix[raw_suffix_len])
1858 raw_suffix_len++;
1859 if (raw_suffix_len > raw_prefix_len)
1860 break;
1861 if (raw_suffix_len == temp_buffer_len)
1862 continue;
1863 phase = RAW_STR;
1864 /* Nothing should be appended to temp_buffer during
1865 RAW_STR phase. */
1866 temp_buffer_len = 17;
1868 if (c == ')')
1870 phase = RAW_STR_SUFFIX;
1871 raw_suffix_len = 0;
1872 temp_buffer_len = 0;
1874 else if (c == '\n')
1876 if (pfile->state.in_directive
1877 || (pfile->state.parsing_args
1878 && pfile->buffer->next_line >= pfile->buffer->rlimit))
1880 cur--;
1881 type = CPP_OTHER;
1882 cpp_error_with_line (pfile, CPP_DL_ERROR, token->src_loc, 0,
1883 "unterminated raw string");
1884 break;
1887 BUF_APPEND (base, cur - base);
1889 if (pfile->buffer->cur < pfile->buffer->rlimit)
1890 CPP_INCREMENT_LINE (pfile, 0);
1891 pfile->buffer->need_line = true;
1893 pfile->buffer->cur = cur-1;
1894 _cpp_process_line_notes (pfile, false);
1895 if (!_cpp_get_fresh_line (pfile))
1897 source_location src_loc = token->src_loc;
1898 token->type = CPP_EOF;
1899 /* Tell the compiler the line number of the EOF token. */
1900 token->src_loc = pfile->line_table->highest_line;
1901 token->flags = BOL;
1902 if (first_buff != NULL)
1903 _cpp_release_buff (pfile, first_buff);
1904 cpp_error_with_line (pfile, CPP_DL_ERROR, src_loc, 0,
1905 "unterminated raw string");
1906 return;
1909 cur = base = pfile->buffer->cur;
1910 note = &pfile->buffer->notes[pfile->buffer->cur_note];
1914 if (CPP_OPTION (pfile, user_literals))
1916 /* If a string format macro, say from inttypes.h, is placed touching
1917 a string literal it could be parsed as a C++11 user-defined string
1918 literal thus breaking the program. */
1919 if (is_macro_not_literal_suffix (pfile, cur))
1921 /* Raise a warning, but do not consume subsequent tokens. */
1922 if (CPP_OPTION (pfile, warn_literal_suffix) && !pfile->state.skipping)
1923 cpp_warning_with_line (pfile, CPP_W_LITERAL_SUFFIX,
1924 token->src_loc, 0,
1925 "invalid suffix on literal; C++11 requires "
1926 "a space between literal and string macro");
1928 /* Grab user defined literal suffix. */
1929 else if (ISIDST (*cur))
1931 type = cpp_userdef_string_add_type (type);
1932 ++cur;
1934 while (ISIDNUM (*cur))
1935 ++cur;
1939 pfile->buffer->cur = cur;
1940 if (first_buff == NULL)
1941 create_literal (pfile, token, base, cur - base, type);
1942 else
1944 uchar *dest = _cpp_unaligned_alloc (pfile, total_len + (cur - base) + 1);
1946 token->type = type;
1947 token->val.str.len = total_len + (cur - base);
1948 token->val.str.text = dest;
1949 last_buff = first_buff;
1950 while (last_buff != NULL)
1952 memcpy (dest, last_buff->base,
1953 BUFF_FRONT (last_buff) - last_buff->base);
1954 dest += BUFF_FRONT (last_buff) - last_buff->base;
1955 last_buff = last_buff->next;
1957 _cpp_release_buff (pfile, first_buff);
1958 memcpy (dest, base, cur - base);
1959 dest[cur - base] = '\0';
1963 /* Lexes a string, character constant, or angle-bracketed header file
1964 name. The stored string contains the spelling, including opening
1965 quote and any leading 'L', 'u', 'U' or 'u8' and optional
1966 'R' modifier. It returns the type of the literal, or CPP_OTHER
1967 if it was not properly terminated, or CPP_LESS for an unterminated
1968 header name which must be relexed as normal tokens.
1970 The spelling is NUL-terminated, but it is not guaranteed that this
1971 is the first NUL since embedded NULs are preserved. */
1972 static void
1973 lex_string (cpp_reader *pfile, cpp_token *token, const uchar *base)
1975 bool saw_NUL = false;
1976 const uchar *cur;
1977 cppchar_t terminator;
1978 enum cpp_ttype type;
1980 cur = base;
1981 terminator = *cur++;
1982 if (terminator == 'L' || terminator == 'U')
1983 terminator = *cur++;
1984 else if (terminator == 'u')
1986 terminator = *cur++;
1987 if (terminator == '8')
1988 terminator = *cur++;
1990 if (terminator == 'R')
1992 lex_raw_string (pfile, token, base, cur);
1993 return;
1995 if (terminator == '"')
1996 type = (*base == 'L' ? CPP_WSTRING :
1997 *base == 'U' ? CPP_STRING32 :
1998 *base == 'u' ? (base[1] == '8' ? CPP_UTF8STRING : CPP_STRING16)
1999 : CPP_STRING);
2000 else if (terminator == '\'')
2001 type = (*base == 'L' ? CPP_WCHAR :
2002 *base == 'U' ? CPP_CHAR32 :
2003 *base == 'u' ? (base[1] == '8' ? CPP_UTF8CHAR : CPP_CHAR16)
2004 : CPP_CHAR);
2005 else
2006 terminator = '>', type = CPP_HEADER_NAME;
2008 for (;;)
2010 cppchar_t c = *cur++;
2012 /* In #include-style directives, terminators are not escapable. */
2013 if (c == '\\' && !pfile->state.angled_headers && *cur != '\n')
2014 cur++;
2015 else if (c == terminator)
2016 break;
2017 else if (c == '\n')
2019 cur--;
2020 /* Unmatched quotes always yield undefined behavior, but
2021 greedy lexing means that what appears to be an unterminated
2022 header name may actually be a legitimate sequence of tokens. */
2023 if (terminator == '>')
2025 token->type = CPP_LESS;
2026 return;
2028 type = CPP_OTHER;
2029 break;
2031 else if (c == '\0')
2032 saw_NUL = true;
2035 if (saw_NUL && !pfile->state.skipping)
2036 cpp_error (pfile, CPP_DL_WARNING,
2037 "null character(s) preserved in literal");
2039 if (type == CPP_OTHER && CPP_OPTION (pfile, lang) != CLK_ASM)
2040 cpp_error (pfile, CPP_DL_PEDWARN, "missing terminating %c character",
2041 (int) terminator);
2043 if (CPP_OPTION (pfile, user_literals))
2045 /* If a string format macro, say from inttypes.h, is placed touching
2046 a string literal it could be parsed as a C++11 user-defined string
2047 literal thus breaking the program. */
2048 if (is_macro_not_literal_suffix (pfile, cur))
2050 /* Raise a warning, but do not consume subsequent tokens. */
2051 if (CPP_OPTION (pfile, warn_literal_suffix) && !pfile->state.skipping)
2052 cpp_warning_with_line (pfile, CPP_W_LITERAL_SUFFIX,
2053 token->src_loc, 0,
2054 "invalid suffix on literal; C++11 requires "
2055 "a space between literal and string macro");
2057 /* Grab user defined literal suffix. */
2058 else if (ISIDST (*cur))
2060 type = cpp_userdef_char_add_type (type);
2061 type = cpp_userdef_string_add_type (type);
2062 ++cur;
2064 while (ISIDNUM (*cur))
2065 ++cur;
2068 else if (CPP_OPTION (pfile, cpp_warn_cxx11_compat)
2069 && is_macro (pfile, cur)
2070 && !pfile->state.skipping)
2071 cpp_warning_with_line (pfile, CPP_W_CXX11_COMPAT,
2072 token->src_loc, 0, "C++11 requires a space "
2073 "between string literal and macro");
2075 pfile->buffer->cur = cur;
2076 create_literal (pfile, token, base, cur - base, type);
2079 /* Return the comment table. The client may not make any assumption
2080 about the ordering of the table. */
2081 cpp_comment_table *
2082 cpp_get_comments (cpp_reader *pfile)
2084 return &pfile->comments;
2087 /* Append a comment to the end of the comment table. */
2088 static void
2089 store_comment (cpp_reader *pfile, cpp_token *token)
2091 int len;
2093 if (pfile->comments.allocated == 0)
2095 pfile->comments.allocated = 256;
2096 pfile->comments.entries = (cpp_comment *) xmalloc
2097 (pfile->comments.allocated * sizeof (cpp_comment));
2100 if (pfile->comments.count == pfile->comments.allocated)
2102 pfile->comments.allocated *= 2;
2103 pfile->comments.entries = (cpp_comment *) xrealloc
2104 (pfile->comments.entries,
2105 pfile->comments.allocated * sizeof (cpp_comment));
2108 len = token->val.str.len;
2110 /* Copy comment. Note, token may not be NULL terminated. */
2111 pfile->comments.entries[pfile->comments.count].comment =
2112 (char *) xmalloc (sizeof (char) * (len + 1));
2113 memcpy (pfile->comments.entries[pfile->comments.count].comment,
2114 token->val.str.text, len);
2115 pfile->comments.entries[pfile->comments.count].comment[len] = '\0';
2117 /* Set source location. */
2118 pfile->comments.entries[pfile->comments.count].sloc = token->src_loc;
2120 /* Increment the count of entries in the comment table. */
2121 pfile->comments.count++;
2124 /* The stored comment includes the comment start and any terminator. */
2125 static void
2126 save_comment (cpp_reader *pfile, cpp_token *token, const unsigned char *from,
2127 cppchar_t type)
2129 unsigned char *buffer;
2130 unsigned int len, clen, i;
2132 len = pfile->buffer->cur - from + 1; /* + 1 for the initial '/'. */
2134 /* C++ comments probably (not definitely) have moved past a new
2135 line, which we don't want to save in the comment. */
2136 if (is_vspace (pfile->buffer->cur[-1]))
2137 len--;
2139 /* If we are currently in a directive or in argument parsing, then
2140 we need to store all C++ comments as C comments internally, and
2141 so we need to allocate a little extra space in that case.
2143 Note that the only time we encounter a directive here is
2144 when we are saving comments in a "#define". */
2145 clen = ((pfile->state.in_directive || pfile->state.parsing_args)
2146 && type == '/') ? len + 2 : len;
2148 buffer = _cpp_unaligned_alloc (pfile, clen);
2150 token->type = CPP_COMMENT;
2151 token->val.str.len = clen;
2152 token->val.str.text = buffer;
2154 buffer[0] = '/';
2155 memcpy (buffer + 1, from, len - 1);
2157 /* Finish conversion to a C comment, if necessary. */
2158 if ((pfile->state.in_directive || pfile->state.parsing_args) && type == '/')
2160 buffer[1] = '*';
2161 buffer[clen - 2] = '*';
2162 buffer[clen - 1] = '/';
2163 /* As there can be in a C++ comments illegal sequences for C comments
2164 we need to filter them out. */
2165 for (i = 2; i < (clen - 2); i++)
2166 if (buffer[i] == '/' && (buffer[i - 1] == '*' || buffer[i + 1] == '*'))
2167 buffer[i] = '|';
2170 /* Finally store this comment for use by clients of libcpp. */
2171 store_comment (pfile, token);
2174 /* Returns true if comment at COMMENT_START is a recognized FALLTHROUGH
2175 comment. */
2177 static bool
2178 fallthrough_comment_p (cpp_reader *pfile, const unsigned char *comment_start)
2180 const unsigned char *from = comment_start + 1;
2182 switch (CPP_OPTION (pfile, cpp_warn_implicit_fallthrough))
2184 /* For both -Wimplicit-fallthrough=0 and -Wimplicit-fallthrough=5 we
2185 don't recognize any comments. The latter only checks attributes,
2186 the former doesn't warn. */
2187 case 0:
2188 default:
2189 return false;
2190 /* -Wimplicit-fallthrough=1 considers any comment, no matter what
2191 content it has. */
2192 case 1:
2193 return true;
2194 case 2:
2195 /* -Wimplicit-fallthrough=2 looks for (case insensitive)
2196 .*falls?[ \t-]*thr(u|ough).* regex. */
2197 for (; (size_t) (pfile->buffer->cur - from) >= sizeof "fallthru" - 1;
2198 from++)
2200 /* Is there anything like strpbrk with upper boundary, or
2201 memchr looking for 2 characters rather than just one? */
2202 if (from[0] != 'f' && from[0] != 'F')
2203 continue;
2204 if (from[1] != 'a' && from[1] != 'A')
2205 continue;
2206 if (from[2] != 'l' && from[2] != 'L')
2207 continue;
2208 if (from[3] != 'l' && from[3] != 'L')
2209 continue;
2210 from += sizeof "fall" - 1;
2211 if (from[0] == 's' || from[0] == 'S')
2212 from++;
2213 while (*from == ' ' || *from == '\t' || *from == '-')
2214 from++;
2215 if (from[0] != 't' && from[0] != 'T')
2216 continue;
2217 if (from[1] != 'h' && from[1] != 'H')
2218 continue;
2219 if (from[2] != 'r' && from[2] != 'R')
2220 continue;
2221 if (from[3] == 'u' || from[3] == 'U')
2222 return true;
2223 if (from[3] != 'o' && from[3] != 'O')
2224 continue;
2225 if (from[4] != 'u' && from[4] != 'U')
2226 continue;
2227 if (from[5] != 'g' && from[5] != 'G')
2228 continue;
2229 if (from[6] != 'h' && from[6] != 'H')
2230 continue;
2231 return true;
2233 return false;
2234 case 3:
2235 case 4:
2236 break;
2239 /* Whole comment contents:
2240 -fallthrough
2241 @fallthrough@
2243 if (*from == '-' || *from == '@')
2245 size_t len = sizeof "fallthrough" - 1;
2246 if ((size_t) (pfile->buffer->cur - from - 1) < len)
2247 return false;
2248 if (memcmp (from + 1, "fallthrough", len))
2249 return false;
2250 if (*from == '@')
2252 if (from[len + 1] != '@')
2253 return false;
2254 len++;
2256 from += 1 + len;
2258 /* Whole comment contents (regex):
2259 lint -fallthrough[ \t]*
2261 else if (*from == 'l')
2263 size_t len = sizeof "int -fallthrough" - 1;
2264 if ((size_t) (pfile->buffer->cur - from - 1) < len)
2265 return false;
2266 if (memcmp (from + 1, "int -fallthrough", len))
2267 return false;
2268 from += 1 + len;
2269 while (*from == ' ' || *from == '\t')
2270 from++;
2272 /* Whole comment contents (regex):
2273 [ \t]*FALLTHR(U|OUGH)[ \t]*
2275 else if (CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) == 4)
2277 while (*from == ' ' || *from == '\t')
2278 from++;
2279 if ((size_t) (pfile->buffer->cur - from) < sizeof "FALLTHRU" - 1)
2280 return false;
2281 if (memcmp (from, "FALLTHR", sizeof "FALLTHR" - 1))
2282 return false;
2283 from += sizeof "FALLTHR" - 1;
2284 if (*from == 'U')
2285 from++;
2286 else if ((size_t) (pfile->buffer->cur - from) < sizeof "OUGH" - 1)
2287 return false;
2288 else if (memcmp (from, "OUGH", sizeof "OUGH" - 1))
2289 return false;
2290 else
2291 from += sizeof "OUGH" - 1;
2292 while (*from == ' ' || *from == '\t')
2293 from++;
2295 /* Whole comment contents (regex):
2296 [ \t.!]*(ELSE,? |INTENTIONAL(LY)? )?FALL(S | |-)?THR(OUGH|U)[ \t.!]*(-[^\n\r]*)?
2297 [ \t.!]*(Else,? |Intentional(ly)? )?Fall((s | |-)[Tt]|t)hr(ough|u)[ \t.!]*(-[^\n\r]*)?
2298 [ \t.!]*([Ee]lse,? |[Ii]ntentional(ly)? )?fall(s | |-)?thr(ough|u)[ \t.!]*(-[^\n\r]*)?
2300 else
2302 while (*from == ' ' || *from == '\t' || *from == '.' || *from == '!')
2303 from++;
2304 unsigned char f = *from;
2305 bool all_upper = false;
2306 if (f == 'E' || f == 'e')
2308 if ((size_t) (pfile->buffer->cur - from)
2309 < sizeof "else fallthru" - 1)
2310 return false;
2311 if (f == 'E' && memcmp (from + 1, "LSE", sizeof "LSE" - 1) == 0)
2312 all_upper = true;
2313 else if (memcmp (from + 1, "lse", sizeof "lse" - 1))
2314 return false;
2315 from += sizeof "else" - 1;
2316 if (*from == ',')
2317 from++;
2318 if (*from != ' ')
2319 return false;
2320 from++;
2321 if (all_upper && *from == 'f')
2322 return false;
2323 if (f == 'e' && *from == 'F')
2324 return false;
2325 f = *from;
2327 else if (f == 'I' || f == 'i')
2329 if ((size_t) (pfile->buffer->cur - from)
2330 < sizeof "intentional fallthru" - 1)
2331 return false;
2332 if (f == 'I' && memcmp (from + 1, "NTENTIONAL",
2333 sizeof "NTENTIONAL" - 1) == 0)
2334 all_upper = true;
2335 else if (memcmp (from + 1, "ntentional",
2336 sizeof "ntentional" - 1))
2337 return false;
2338 from += sizeof "intentional" - 1;
2339 if (*from == ' ')
2341 from++;
2342 if (all_upper && *from == 'f')
2343 return false;
2345 else if (all_upper)
2347 if (memcmp (from, "LY F", sizeof "LY F" - 1))
2348 return false;
2349 from += sizeof "LY " - 1;
2351 else
2353 if (memcmp (from, "ly ", sizeof "ly " - 1))
2354 return false;
2355 from += sizeof "ly " - 1;
2357 if (f == 'i' && *from == 'F')
2358 return false;
2359 f = *from;
2361 if (f != 'F' && f != 'f')
2362 return false;
2363 if ((size_t) (pfile->buffer->cur - from) < sizeof "fallthru" - 1)
2364 return false;
2365 if (f == 'F' && memcmp (from + 1, "ALL", sizeof "ALL" - 1) == 0)
2366 all_upper = true;
2367 else if (all_upper)
2368 return false;
2369 else if (memcmp (from + 1, "all", sizeof "all" - 1))
2370 return false;
2371 from += sizeof "fall" - 1;
2372 if (*from == (all_upper ? 'S' : 's') && from[1] == ' ')
2373 from += 2;
2374 else if (*from == ' ' || *from == '-')
2375 from++;
2376 else if (*from != (all_upper ? 'T' : 't'))
2377 return false;
2378 if ((f == 'f' || *from != 'T') && (all_upper || *from != 't'))
2379 return false;
2380 if ((size_t) (pfile->buffer->cur - from) < sizeof "thru" - 1)
2381 return false;
2382 if (memcmp (from + 1, all_upper ? "HRU" : "hru", sizeof "hru" - 1))
2384 if ((size_t) (pfile->buffer->cur - from) < sizeof "through" - 1)
2385 return false;
2386 if (memcmp (from + 1, all_upper ? "HROUGH" : "hrough",
2387 sizeof "hrough" - 1))
2388 return false;
2389 from += sizeof "through" - 1;
2391 else
2392 from += sizeof "thru" - 1;
2393 while (*from == ' ' || *from == '\t' || *from == '.' || *from == '!')
2394 from++;
2395 if (*from == '-')
2397 from++;
2398 if (*comment_start == '*')
2402 while (*from && *from != '*'
2403 && *from != '\n' && *from != '\r')
2404 from++;
2405 if (*from != '*' || from[1] == '/')
2406 break;
2407 from++;
2409 while (1);
2411 else
2412 while (*from && *from != '\n' && *from != '\r')
2413 from++;
2416 /* C block comment. */
2417 if (*comment_start == '*')
2419 if (*from != '*' || from[1] != '/')
2420 return false;
2422 /* C++ line comment. */
2423 else if (*from != '\n')
2424 return false;
2426 return true;
2429 /* Allocate COUNT tokens for RUN. */
2430 void
2431 _cpp_init_tokenrun (tokenrun *run, unsigned int count)
2433 run->base = XNEWVEC (cpp_token, count);
2434 run->limit = run->base + count;
2435 run->next = NULL;
2438 /* Returns the next tokenrun, or creates one if there is none. */
2439 static tokenrun *
2440 next_tokenrun (tokenrun *run)
2442 if (run->next == NULL)
2444 run->next = XNEW (tokenrun);
2445 run->next->prev = run;
2446 _cpp_init_tokenrun (run->next, 250);
2449 return run->next;
2452 /* Return the number of not yet processed token in a given
2453 context. */
2455 _cpp_remaining_tokens_num_in_context (cpp_context *context)
2457 if (context->tokens_kind == TOKENS_KIND_DIRECT)
2458 return (LAST (context).token - FIRST (context).token);
2459 else if (context->tokens_kind == TOKENS_KIND_INDIRECT
2460 || context->tokens_kind == TOKENS_KIND_EXTENDED)
2461 return (LAST (context).ptoken - FIRST (context).ptoken);
2462 else
2463 abort ();
2466 /* Returns the token present at index INDEX in a given context. If
2467 INDEX is zero, the next token to be processed is returned. */
2468 static const cpp_token*
2469 _cpp_token_from_context_at (cpp_context *context, int index)
2471 if (context->tokens_kind == TOKENS_KIND_DIRECT)
2472 return &(FIRST (context).token[index]);
2473 else if (context->tokens_kind == TOKENS_KIND_INDIRECT
2474 || context->tokens_kind == TOKENS_KIND_EXTENDED)
2475 return FIRST (context).ptoken[index];
2476 else
2477 abort ();
2480 /* Look ahead in the input stream. */
2481 const cpp_token *
2482 cpp_peek_token (cpp_reader *pfile, int index)
2484 cpp_context *context = pfile->context;
2485 const cpp_token *peektok;
2486 int count;
2488 /* First, scan through any pending cpp_context objects. */
2489 while (context->prev)
2491 ptrdiff_t sz = _cpp_remaining_tokens_num_in_context (context);
2493 if (index < (int) sz)
2494 return _cpp_token_from_context_at (context, index);
2495 index -= (int) sz;
2496 context = context->prev;
2499 /* We will have to read some new tokens after all (and do so
2500 without invalidating preceding tokens). */
2501 count = index;
2502 pfile->keep_tokens++;
2504 /* For peeked tokens temporarily disable line_change reporting,
2505 until the tokens are parsed for real. */
2506 void (*line_change) (cpp_reader *, const cpp_token *, int)
2507 = pfile->cb.line_change;
2508 pfile->cb.line_change = NULL;
2512 peektok = _cpp_lex_token (pfile);
2513 if (peektok->type == CPP_EOF)
2515 index--;
2516 break;
2519 while (index--);
2521 _cpp_backup_tokens_direct (pfile, count - index);
2522 pfile->keep_tokens--;
2523 pfile->cb.line_change = line_change;
2525 return peektok;
2528 /* Allocate a single token that is invalidated at the same time as the
2529 rest of the tokens on the line. Has its line and col set to the
2530 same as the last lexed token, so that diagnostics appear in the
2531 right place. */
2532 cpp_token *
2533 _cpp_temp_token (cpp_reader *pfile)
2535 cpp_token *old, *result;
2536 ptrdiff_t sz = pfile->cur_run->limit - pfile->cur_token;
2537 ptrdiff_t la = (ptrdiff_t) pfile->lookaheads;
2539 old = pfile->cur_token - 1;
2540 /* Any pre-existing lookaheads must not be clobbered. */
2541 if (la)
2543 if (sz <= la)
2545 tokenrun *next = next_tokenrun (pfile->cur_run);
2547 if (sz < la)
2548 memmove (next->base + 1, next->base,
2549 (la - sz) * sizeof (cpp_token));
2551 next->base[0] = pfile->cur_run->limit[-1];
2554 if (sz > 1)
2555 memmove (pfile->cur_token + 1, pfile->cur_token,
2556 MIN (la, sz - 1) * sizeof (cpp_token));
2559 if (!sz && pfile->cur_token == pfile->cur_run->limit)
2561 pfile->cur_run = next_tokenrun (pfile->cur_run);
2562 pfile->cur_token = pfile->cur_run->base;
2565 result = pfile->cur_token++;
2566 result->src_loc = old->src_loc;
2567 return result;
2570 /* Lex a token into RESULT (external interface). Takes care of issues
2571 like directive handling, token lookahead, multiple include
2572 optimization and skipping. */
2573 const cpp_token *
2574 _cpp_lex_token (cpp_reader *pfile)
2576 cpp_token *result;
2578 for (;;)
2580 if (pfile->cur_token == pfile->cur_run->limit)
2582 pfile->cur_run = next_tokenrun (pfile->cur_run);
2583 pfile->cur_token = pfile->cur_run->base;
2585 /* We assume that the current token is somewhere in the current
2586 run. */
2587 if (pfile->cur_token < pfile->cur_run->base
2588 || pfile->cur_token >= pfile->cur_run->limit)
2589 abort ();
2591 if (pfile->lookaheads)
2593 pfile->lookaheads--;
2594 result = pfile->cur_token++;
2596 else
2597 result = _cpp_lex_direct (pfile);
2599 if (result->flags & BOL)
2601 /* Is this a directive. If _cpp_handle_directive returns
2602 false, it is an assembler #. */
2603 if (result->type == CPP_HASH
2604 /* 6.10.3 p 11: Directives in a list of macro arguments
2605 gives undefined behavior. This implementation
2606 handles the directive as normal. */
2607 && pfile->state.parsing_args != 1)
2609 if (_cpp_handle_directive (pfile, result->flags & PREV_WHITE))
2611 if (pfile->directive_result.type == CPP_PADDING)
2612 continue;
2613 result = &pfile->directive_result;
2616 else if (pfile->state.in_deferred_pragma)
2617 result = &pfile->directive_result;
2619 if (pfile->cb.line_change && !pfile->state.skipping)
2620 pfile->cb.line_change (pfile, result, pfile->state.parsing_args);
2623 /* We don't skip tokens in directives. */
2624 if (pfile->state.in_directive || pfile->state.in_deferred_pragma)
2625 break;
2627 /* Outside a directive, invalidate controlling macros. At file
2628 EOF, _cpp_lex_direct takes care of popping the buffer, so we never
2629 get here and MI optimization works. */
2630 pfile->mi_valid = false;
2632 if (!pfile->state.skipping || result->type == CPP_EOF)
2633 break;
2636 return result;
2639 /* Returns true if a fresh line has been loaded. */
2640 bool
2641 _cpp_get_fresh_line (cpp_reader *pfile)
2643 int return_at_eof;
2645 /* We can't get a new line until we leave the current directive. */
2646 if (pfile->state.in_directive)
2647 return false;
2649 for (;;)
2651 cpp_buffer *buffer = pfile->buffer;
2653 if (!buffer->need_line)
2654 return true;
2656 if (buffer->next_line < buffer->rlimit)
2658 _cpp_clean_line (pfile);
2659 return true;
2662 /* First, get out of parsing arguments state. */
2663 if (pfile->state.parsing_args)
2664 return false;
2666 /* End of buffer. Non-empty files should end in a newline. */
2667 if (buffer->buf != buffer->rlimit
2668 && buffer->next_line > buffer->rlimit
2669 && !buffer->from_stage3)
2671 /* Clip to buffer size. */
2672 buffer->next_line = buffer->rlimit;
2675 return_at_eof = buffer->return_at_eof;
2676 _cpp_pop_buffer (pfile);
2677 if (pfile->buffer == NULL || return_at_eof)
2678 return false;
2682 #define IF_NEXT_IS(CHAR, THEN_TYPE, ELSE_TYPE) \
2683 do \
2685 result->type = ELSE_TYPE; \
2686 if (*buffer->cur == CHAR) \
2687 buffer->cur++, result->type = THEN_TYPE; \
2689 while (0)
2691 /* Lex a token into pfile->cur_token, which is also incremented, to
2692 get diagnostics pointing to the correct location.
2694 Does not handle issues such as token lookahead, multiple-include
2695 optimization, directives, skipping etc. This function is only
2696 suitable for use by _cpp_lex_token, and in special cases like
2697 lex_expansion_token which doesn't care for any of these issues.
2699 When meeting a newline, returns CPP_EOF if parsing a directive,
2700 otherwise returns to the start of the token buffer if permissible.
2701 Returns the location of the lexed token. */
2702 cpp_token *
2703 _cpp_lex_direct (cpp_reader *pfile)
2705 cppchar_t c;
2706 cpp_buffer *buffer;
2707 const unsigned char *comment_start;
2708 bool fallthrough_comment = false;
2709 cpp_token *result = pfile->cur_token++;
2711 fresh_line:
2712 result->flags = 0;
2713 buffer = pfile->buffer;
2714 if (buffer->need_line)
2716 if (pfile->state.in_deferred_pragma)
2718 result->type = CPP_PRAGMA_EOL;
2719 pfile->state.in_deferred_pragma = false;
2720 if (!pfile->state.pragma_allow_expansion)
2721 pfile->state.prevent_expansion--;
2722 return result;
2724 if (!_cpp_get_fresh_line (pfile))
2726 result->type = CPP_EOF;
2727 if (!pfile->state.in_directive)
2729 /* Tell the compiler the line number of the EOF token. */
2730 result->src_loc = pfile->line_table->highest_line;
2731 result->flags = BOL;
2733 return result;
2735 if (buffer != pfile->buffer)
2736 fallthrough_comment = false;
2737 if (!pfile->keep_tokens)
2739 pfile->cur_run = &pfile->base_run;
2740 result = pfile->base_run.base;
2741 pfile->cur_token = result + 1;
2743 result->flags = BOL;
2744 if (pfile->state.parsing_args == 2)
2745 result->flags |= PREV_WHITE;
2747 buffer = pfile->buffer;
2748 update_tokens_line:
2749 result->src_loc = pfile->line_table->highest_line;
2751 skipped_white:
2752 if (buffer->cur >= buffer->notes[buffer->cur_note].pos
2753 && !pfile->overlaid_buffer)
2755 _cpp_process_line_notes (pfile, false);
2756 result->src_loc = pfile->line_table->highest_line;
2758 c = *buffer->cur++;
2760 if (pfile->forced_token_location_p)
2761 result->src_loc = *pfile->forced_token_location_p;
2762 else
2763 result->src_loc = linemap_position_for_column (pfile->line_table,
2764 CPP_BUF_COLUMN (buffer, buffer->cur));
2766 switch (c)
2768 case ' ': case '\t': case '\f': case '\v': case '\0':
2769 result->flags |= PREV_WHITE;
2770 skip_whitespace (pfile, c);
2771 goto skipped_white;
2773 case '\n':
2774 if (buffer->cur < buffer->rlimit)
2775 CPP_INCREMENT_LINE (pfile, 0);
2776 buffer->need_line = true;
2777 goto fresh_line;
2779 case '0': case '1': case '2': case '3': case '4':
2780 case '5': case '6': case '7': case '8': case '9':
2782 struct normalize_state nst = INITIAL_NORMALIZE_STATE;
2783 result->type = CPP_NUMBER;
2784 lex_number (pfile, &result->val.str, &nst);
2785 warn_about_normalization (pfile, result, &nst);
2786 break;
2789 case 'L':
2790 case 'u':
2791 case 'U':
2792 case 'R':
2793 /* 'L', 'u', 'U', 'u8' or 'R' may introduce wide characters,
2794 wide strings or raw strings. */
2795 if (c == 'L' || CPP_OPTION (pfile, rliterals)
2796 || (c != 'R' && CPP_OPTION (pfile, uliterals)))
2798 if ((*buffer->cur == '\'' && c != 'R')
2799 || *buffer->cur == '"'
2800 || (*buffer->cur == 'R'
2801 && c != 'R'
2802 && buffer->cur[1] == '"'
2803 && CPP_OPTION (pfile, rliterals))
2804 || (*buffer->cur == '8'
2805 && c == 'u'
2806 && ((buffer->cur[1] == '"' || (buffer->cur[1] == '\''
2807 && CPP_OPTION (pfile, utf8_char_literals)))
2808 || (buffer->cur[1] == 'R' && buffer->cur[2] == '"'
2809 && CPP_OPTION (pfile, rliterals)))))
2811 lex_string (pfile, result, buffer->cur - 1);
2812 break;
2815 /* Fall through. */
2817 case '_':
2818 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
2819 case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
2820 case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
2821 case 's': case 't': case 'v': case 'w': case 'x':
2822 case 'y': case 'z':
2823 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
2824 case 'G': case 'H': case 'I': case 'J': case 'K':
2825 case 'M': case 'N': case 'O': case 'P': case 'Q':
2826 case 'S': case 'T': case 'V': case 'W': case 'X':
2827 case 'Y': case 'Z':
2828 result->type = CPP_NAME;
2830 struct normalize_state nst = INITIAL_NORMALIZE_STATE;
2831 result->val.node.node = lex_identifier (pfile, buffer->cur - 1, false,
2832 &nst,
2833 &result->val.node.spelling);
2834 warn_about_normalization (pfile, result, &nst);
2837 /* Convert named operators to their proper types. */
2838 if (result->val.node.node->flags & NODE_OPERATOR)
2840 result->flags |= NAMED_OP;
2841 result->type = (enum cpp_ttype) result->val.node.node->directive_index;
2844 /* Signal FALLTHROUGH comment followed by another token. */
2845 if (fallthrough_comment)
2846 result->flags |= PREV_FALLTHROUGH;
2847 break;
2849 case '\'':
2850 case '"':
2851 lex_string (pfile, result, buffer->cur - 1);
2852 break;
2854 case '/':
2855 /* A potential block or line comment. */
2856 comment_start = buffer->cur;
2857 c = *buffer->cur;
2859 if (c == '*')
2861 if (_cpp_skip_block_comment (pfile))
2862 cpp_error (pfile, CPP_DL_ERROR, "unterminated comment");
2864 else if (c == '/' && ! CPP_OPTION (pfile, traditional))
2866 /* Don't warn for system headers. */
2867 if (cpp_in_system_header (pfile))
2869 /* Warn about comments if pedantically GNUC89, and not
2870 in system headers. */
2871 else if (CPP_OPTION (pfile, lang) == CLK_GNUC89
2872 && CPP_PEDANTIC (pfile)
2873 && ! buffer->warned_cplusplus_comments)
2875 cpp_error (pfile, CPP_DL_PEDWARN,
2876 "C++ style comments are not allowed in ISO C90");
2877 cpp_error (pfile, CPP_DL_PEDWARN,
2878 "(this will be reported only once per input file)");
2879 buffer->warned_cplusplus_comments = 1;
2881 /* Or if specifically desired via -Wc90-c99-compat. */
2882 else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat) > 0
2883 && ! CPP_OPTION (pfile, cplusplus)
2884 && ! buffer->warned_cplusplus_comments)
2886 cpp_error (pfile, CPP_DL_WARNING,
2887 "C++ style comments are incompatible with C90");
2888 cpp_error (pfile, CPP_DL_WARNING,
2889 "(this will be reported only once per input file)");
2890 buffer->warned_cplusplus_comments = 1;
2892 /* In C89/C94, C++ style comments are forbidden. */
2893 else if ((CPP_OPTION (pfile, lang) == CLK_STDC89
2894 || CPP_OPTION (pfile, lang) == CLK_STDC94))
2896 /* But don't be confused about valid code such as
2897 - // immediately followed by *,
2898 - // in a preprocessing directive,
2899 - // in an #if 0 block. */
2900 if (buffer->cur[1] == '*'
2901 || pfile->state.in_directive
2902 || pfile->state.skipping)
2904 result->type = CPP_DIV;
2905 break;
2907 else if (! buffer->warned_cplusplus_comments)
2909 cpp_error (pfile, CPP_DL_ERROR,
2910 "C++ style comments are not allowed in ISO C90");
2911 cpp_error (pfile, CPP_DL_ERROR,
2912 "(this will be reported only once per input "
2913 "file)");
2914 buffer->warned_cplusplus_comments = 1;
2917 if (skip_line_comment (pfile) && CPP_OPTION (pfile, warn_comments))
2918 cpp_warning (pfile, CPP_W_COMMENTS, "multi-line comment");
2920 else if (c == '=')
2922 buffer->cur++;
2923 result->type = CPP_DIV_EQ;
2924 break;
2926 else
2928 result->type = CPP_DIV;
2929 break;
2932 if (fallthrough_comment_p (pfile, comment_start))
2933 fallthrough_comment = true;
2935 if (pfile->cb.comment)
2937 size_t len = pfile->buffer->cur - comment_start;
2938 pfile->cb.comment (pfile, result->src_loc, comment_start - 1,
2939 len + 1);
2942 if (!pfile->state.save_comments)
2944 result->flags |= PREV_WHITE;
2945 goto update_tokens_line;
2948 if (fallthrough_comment)
2949 result->flags |= PREV_FALLTHROUGH;
2951 /* Save the comment as a token in its own right. */
2952 save_comment (pfile, result, comment_start, c);
2953 break;
2955 case '<':
2956 if (pfile->state.angled_headers)
2958 lex_string (pfile, result, buffer->cur - 1);
2959 if (result->type != CPP_LESS)
2960 break;
2963 result->type = CPP_LESS;
2964 if (*buffer->cur == '=')
2965 buffer->cur++, result->type = CPP_LESS_EQ;
2966 else if (*buffer->cur == '<')
2968 buffer->cur++;
2969 IF_NEXT_IS ('=', CPP_LSHIFT_EQ, CPP_LSHIFT);
2971 else if (CPP_OPTION (pfile, digraphs))
2973 if (*buffer->cur == ':')
2975 /* C++11 [2.5/3 lex.pptoken], "Otherwise, if the next
2976 three characters are <:: and the subsequent character
2977 is neither : nor >, the < is treated as a preprocessor
2978 token by itself". */
2979 if (CPP_OPTION (pfile, cplusplus)
2980 && CPP_OPTION (pfile, lang) != CLK_CXX98
2981 && CPP_OPTION (pfile, lang) != CLK_GNUCXX
2982 && buffer->cur[1] == ':'
2983 && buffer->cur[2] != ':' && buffer->cur[2] != '>')
2984 break;
2986 buffer->cur++;
2987 result->flags |= DIGRAPH;
2988 result->type = CPP_OPEN_SQUARE;
2990 else if (*buffer->cur == '%')
2992 buffer->cur++;
2993 result->flags |= DIGRAPH;
2994 result->type = CPP_OPEN_BRACE;
2997 break;
2999 case '>':
3000 result->type = CPP_GREATER;
3001 if (*buffer->cur == '=')
3002 buffer->cur++, result->type = CPP_GREATER_EQ;
3003 else if (*buffer->cur == '>')
3005 buffer->cur++;
3006 IF_NEXT_IS ('=', CPP_RSHIFT_EQ, CPP_RSHIFT);
3008 break;
3010 case '%':
3011 result->type = CPP_MOD;
3012 if (*buffer->cur == '=')
3013 buffer->cur++, result->type = CPP_MOD_EQ;
3014 else if (CPP_OPTION (pfile, digraphs))
3016 if (*buffer->cur == ':')
3018 buffer->cur++;
3019 result->flags |= DIGRAPH;
3020 result->type = CPP_HASH;
3021 if (*buffer->cur == '%' && buffer->cur[1] == ':')
3022 buffer->cur += 2, result->type = CPP_PASTE, result->val.token_no = 0;
3024 else if (*buffer->cur == '>')
3026 buffer->cur++;
3027 result->flags |= DIGRAPH;
3028 result->type = CPP_CLOSE_BRACE;
3031 break;
3033 case '.':
3034 result->type = CPP_DOT;
3035 if (ISDIGIT (*buffer->cur))
3037 struct normalize_state nst = INITIAL_NORMALIZE_STATE;
3038 result->type = CPP_NUMBER;
3039 lex_number (pfile, &result->val.str, &nst);
3040 warn_about_normalization (pfile, result, &nst);
3042 else if (*buffer->cur == '.' && buffer->cur[1] == '.')
3043 buffer->cur += 2, result->type = CPP_ELLIPSIS;
3044 else if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus))
3045 buffer->cur++, result->type = CPP_DOT_STAR;
3046 break;
3048 case '+':
3049 result->type = CPP_PLUS;
3050 if (*buffer->cur == '+')
3051 buffer->cur++, result->type = CPP_PLUS_PLUS;
3052 else if (*buffer->cur == '=')
3053 buffer->cur++, result->type = CPP_PLUS_EQ;
3054 break;
3056 case '-':
3057 result->type = CPP_MINUS;
3058 if (*buffer->cur == '>')
3060 buffer->cur++;
3061 result->type = CPP_DEREF;
3062 if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus))
3063 buffer->cur++, result->type = CPP_DEREF_STAR;
3065 else if (*buffer->cur == '-')
3066 buffer->cur++, result->type = CPP_MINUS_MINUS;
3067 else if (*buffer->cur == '=')
3068 buffer->cur++, result->type = CPP_MINUS_EQ;
3069 break;
3071 case '&':
3072 result->type = CPP_AND;
3073 if (*buffer->cur == '&')
3074 buffer->cur++, result->type = CPP_AND_AND;
3075 else if (*buffer->cur == '=')
3076 buffer->cur++, result->type = CPP_AND_EQ;
3077 break;
3079 case '|':
3080 result->type = CPP_OR;
3081 if (*buffer->cur == '|')
3082 buffer->cur++, result->type = CPP_OR_OR;
3083 else if (*buffer->cur == '=')
3084 buffer->cur++, result->type = CPP_OR_EQ;
3085 break;
3087 case ':':
3088 result->type = CPP_COLON;
3089 if (*buffer->cur == ':' && CPP_OPTION (pfile, cplusplus))
3090 buffer->cur++, result->type = CPP_SCOPE;
3091 else if (*buffer->cur == '>' && CPP_OPTION (pfile, digraphs))
3093 buffer->cur++;
3094 result->flags |= DIGRAPH;
3095 result->type = CPP_CLOSE_SQUARE;
3097 break;
3099 case '*': IF_NEXT_IS ('=', CPP_MULT_EQ, CPP_MULT); break;
3100 case '=': IF_NEXT_IS ('=', CPP_EQ_EQ, CPP_EQ); break;
3101 case '!': IF_NEXT_IS ('=', CPP_NOT_EQ, CPP_NOT); break;
3102 case '^': IF_NEXT_IS ('=', CPP_XOR_EQ, CPP_XOR); break;
3103 case '#': IF_NEXT_IS ('#', CPP_PASTE, CPP_HASH); result->val.token_no = 0; break;
3105 case '?': result->type = CPP_QUERY; break;
3106 case '~': result->type = CPP_COMPL; break;
3107 case ',': result->type = CPP_COMMA; break;
3108 case '(': result->type = CPP_OPEN_PAREN; break;
3109 case ')': result->type = CPP_CLOSE_PAREN; break;
3110 case '[': result->type = CPP_OPEN_SQUARE; break;
3111 case ']': result->type = CPP_CLOSE_SQUARE; break;
3112 case '{': result->type = CPP_OPEN_BRACE; break;
3113 case '}': result->type = CPP_CLOSE_BRACE; break;
3114 case ';': result->type = CPP_SEMICOLON; break;
3116 /* @ is a punctuator in Objective-C. */
3117 case '@': result->type = CPP_ATSIGN; break;
3119 case '$':
3120 case '\\':
3122 const uchar *base = --buffer->cur;
3123 struct normalize_state nst = INITIAL_NORMALIZE_STATE;
3125 if (forms_identifier_p (pfile, true, &nst))
3127 result->type = CPP_NAME;
3128 result->val.node.node = lex_identifier (pfile, base, true, &nst,
3129 &result->val.node.spelling);
3130 warn_about_normalization (pfile, result, &nst);
3131 break;
3133 buffer->cur++;
3135 /* FALLTHRU */
3137 default:
3138 create_literal (pfile, result, buffer->cur - 1, 1, CPP_OTHER);
3139 break;
3142 /* Potentially convert the location of the token to a range. */
3143 if (result->src_loc >= RESERVED_LOCATION_COUNT
3144 && result->type != CPP_EOF)
3146 /* Ensure that any line notes are processed, so that we have the
3147 correct physical line/column for the end-point of the token even
3148 when a logical line is split via one or more backslashes. */
3149 if (buffer->cur >= buffer->notes[buffer->cur_note].pos
3150 && !pfile->overlaid_buffer)
3151 _cpp_process_line_notes (pfile, false);
3153 source_range tok_range;
3154 tok_range.m_start = result->src_loc;
3155 tok_range.m_finish
3156 = linemap_position_for_column (pfile->line_table,
3157 CPP_BUF_COLUMN (buffer, buffer->cur));
3159 result->src_loc = COMBINE_LOCATION_DATA (pfile->line_table,
3160 result->src_loc,
3161 tok_range, NULL);
3164 return result;
3167 /* An upper bound on the number of bytes needed to spell TOKEN.
3168 Does not include preceding whitespace. */
3169 unsigned int
3170 cpp_token_len (const cpp_token *token)
3172 unsigned int len;
3174 switch (TOKEN_SPELL (token))
3176 default: len = 6; break;
3177 case SPELL_LITERAL: len = token->val.str.len; break;
3178 case SPELL_IDENT: len = NODE_LEN (token->val.node.node) * 10; break;
3181 return len;
3184 /* Parse UTF-8 out of NAMEP and place a \U escape in BUFFER.
3185 Return the number of bytes read out of NAME. (There are always
3186 10 bytes written to BUFFER.) */
3188 static size_t
3189 utf8_to_ucn (unsigned char *buffer, const unsigned char *name)
3191 int j;
3192 int ucn_len = 0;
3193 int ucn_len_c;
3194 unsigned t;
3195 unsigned long utf32;
3197 /* Compute the length of the UTF-8 sequence. */
3198 for (t = *name; t & 0x80; t <<= 1)
3199 ucn_len++;
3201 utf32 = *name & (0x7F >> ucn_len);
3202 for (ucn_len_c = 1; ucn_len_c < ucn_len; ucn_len_c++)
3204 utf32 = (utf32 << 6) | (*++name & 0x3F);
3206 /* Ill-formed UTF-8. */
3207 if ((*name & ~0x3F) != 0x80)
3208 abort ();
3211 *buffer++ = '\\';
3212 *buffer++ = 'U';
3213 for (j = 7; j >= 0; j--)
3214 *buffer++ = "0123456789abcdef"[(utf32 >> (4 * j)) & 0xF];
3215 return ucn_len;
3218 /* Given a token TYPE corresponding to a digraph, return a pointer to
3219 the spelling of the digraph. */
3220 static const unsigned char *
3221 cpp_digraph2name (enum cpp_ttype type)
3223 return digraph_spellings[(int) type - (int) CPP_FIRST_DIGRAPH];
3226 /* Write the spelling of an identifier IDENT, using UCNs, to BUFFER.
3227 The buffer must already contain the enough space to hold the
3228 token's spelling. Returns a pointer to the character after the
3229 last character written. */
3230 unsigned char *
3231 _cpp_spell_ident_ucns (unsigned char *buffer, cpp_hashnode *ident)
3233 size_t i;
3234 const unsigned char *name = NODE_NAME (ident);
3236 for (i = 0; i < NODE_LEN (ident); i++)
3237 if (name[i] & ~0x7F)
3239 i += utf8_to_ucn (buffer, name + i) - 1;
3240 buffer += 10;
3242 else
3243 *buffer++ = name[i];
3245 return buffer;
3248 /* Write the spelling of a token TOKEN to BUFFER. The buffer must
3249 already contain the enough space to hold the token's spelling.
3250 Returns a pointer to the character after the last character written.
3251 FORSTRING is true if this is to be the spelling after translation
3252 phase 1 (with the original spelling of extended identifiers), false
3253 if extended identifiers should always be written using UCNs (there is
3254 no option for always writing them in the internal UTF-8 form).
3255 FIXME: Would be nice if we didn't need the PFILE argument. */
3256 unsigned char *
3257 cpp_spell_token (cpp_reader *pfile, const cpp_token *token,
3258 unsigned char *buffer, bool forstring)
3260 switch (TOKEN_SPELL (token))
3262 case SPELL_OPERATOR:
3264 const unsigned char *spelling;
3265 unsigned char c;
3267 if (token->flags & DIGRAPH)
3268 spelling = cpp_digraph2name (token->type);
3269 else if (token->flags & NAMED_OP)
3270 goto spell_ident;
3271 else
3272 spelling = TOKEN_NAME (token);
3274 while ((c = *spelling++) != '\0')
3275 *buffer++ = c;
3277 break;
3279 spell_ident:
3280 case SPELL_IDENT:
3281 if (forstring)
3283 memcpy (buffer, NODE_NAME (token->val.node.spelling),
3284 NODE_LEN (token->val.node.spelling));
3285 buffer += NODE_LEN (token->val.node.spelling);
3287 else
3288 buffer = _cpp_spell_ident_ucns (buffer, token->val.node.node);
3289 break;
3291 case SPELL_LITERAL:
3292 memcpy (buffer, token->val.str.text, token->val.str.len);
3293 buffer += token->val.str.len;
3294 break;
3296 case SPELL_NONE:
3297 cpp_error (pfile, CPP_DL_ICE,
3298 "unspellable token %s", TOKEN_NAME (token));
3299 break;
3302 return buffer;
3305 /* Returns TOKEN spelt as a null-terminated string. The string is
3306 freed when the reader is destroyed. Useful for diagnostics. */
3307 unsigned char *
3308 cpp_token_as_text (cpp_reader *pfile, const cpp_token *token)
3310 unsigned int len = cpp_token_len (token) + 1;
3311 unsigned char *start = _cpp_unaligned_alloc (pfile, len), *end;
3313 end = cpp_spell_token (pfile, token, start, false);
3314 end[0] = '\0';
3316 return start;
3319 /* Returns a pointer to a string which spells the token defined by
3320 TYPE and FLAGS. Used by C front ends, which really should move to
3321 using cpp_token_as_text. */
3322 const char *
3323 cpp_type2name (enum cpp_ttype type, unsigned char flags)
3325 if (flags & DIGRAPH)
3326 return (const char *) cpp_digraph2name (type);
3327 else if (flags & NAMED_OP)
3328 return cpp_named_operator2name (type);
3330 return (const char *) token_spellings[type].name;
3333 /* Writes the spelling of token to FP, without any preceding space.
3334 Separated from cpp_spell_token for efficiency - to avoid stdio
3335 double-buffering. */
3336 void
3337 cpp_output_token (const cpp_token *token, FILE *fp)
3339 switch (TOKEN_SPELL (token))
3341 case SPELL_OPERATOR:
3343 const unsigned char *spelling;
3344 int c;
3346 if (token->flags & DIGRAPH)
3347 spelling = cpp_digraph2name (token->type);
3348 else if (token->flags & NAMED_OP)
3349 goto spell_ident;
3350 else
3351 spelling = TOKEN_NAME (token);
3353 c = *spelling;
3355 putc (c, fp);
3356 while ((c = *++spelling) != '\0');
3358 break;
3360 spell_ident:
3361 case SPELL_IDENT:
3363 size_t i;
3364 const unsigned char * name = NODE_NAME (token->val.node.node);
3366 for (i = 0; i < NODE_LEN (token->val.node.node); i++)
3367 if (name[i] & ~0x7F)
3369 unsigned char buffer[10];
3370 i += utf8_to_ucn (buffer, name + i) - 1;
3371 fwrite (buffer, 1, 10, fp);
3373 else
3374 fputc (NODE_NAME (token->val.node.node)[i], fp);
3376 break;
3378 case SPELL_LITERAL:
3379 fwrite (token->val.str.text, 1, token->val.str.len, fp);
3380 break;
3382 case SPELL_NONE:
3383 /* An error, most probably. */
3384 break;
3388 /* Compare two tokens. */
3390 _cpp_equiv_tokens (const cpp_token *a, const cpp_token *b)
3392 if (a->type == b->type && a->flags == b->flags)
3393 switch (TOKEN_SPELL (a))
3395 default: /* Keep compiler happy. */
3396 case SPELL_OPERATOR:
3397 /* token_no is used to track where multiple consecutive ##
3398 tokens were originally located. */
3399 return (a->type != CPP_PASTE || a->val.token_no == b->val.token_no);
3400 case SPELL_NONE:
3401 return (a->type != CPP_MACRO_ARG
3402 || (a->val.macro_arg.arg_no == b->val.macro_arg.arg_no
3403 && a->val.macro_arg.spelling == b->val.macro_arg.spelling));
3404 case SPELL_IDENT:
3405 return (a->val.node.node == b->val.node.node
3406 && a->val.node.spelling == b->val.node.spelling);
3407 case SPELL_LITERAL:
3408 return (a->val.str.len == b->val.str.len
3409 && !memcmp (a->val.str.text, b->val.str.text,
3410 a->val.str.len));
3413 return 0;
3416 /* Returns nonzero if a space should be inserted to avoid an
3417 accidental token paste for output. For simplicity, it is
3418 conservative, and occasionally advises a space where one is not
3419 needed, e.g. "." and ".2". */
3421 cpp_avoid_paste (cpp_reader *pfile, const cpp_token *token1,
3422 const cpp_token *token2)
3424 enum cpp_ttype a = token1->type, b = token2->type;
3425 cppchar_t c;
3427 if (token1->flags & NAMED_OP)
3428 a = CPP_NAME;
3429 if (token2->flags & NAMED_OP)
3430 b = CPP_NAME;
3432 c = EOF;
3433 if (token2->flags & DIGRAPH)
3434 c = digraph_spellings[(int) b - (int) CPP_FIRST_DIGRAPH][0];
3435 else if (token_spellings[b].category == SPELL_OPERATOR)
3436 c = token_spellings[b].name[0];
3438 /* Quickly get everything that can paste with an '='. */
3439 if ((int) a <= (int) CPP_LAST_EQ && c == '=')
3440 return 1;
3442 switch (a)
3444 case CPP_GREATER: return c == '>';
3445 case CPP_LESS: return c == '<' || c == '%' || c == ':';
3446 case CPP_PLUS: return c == '+';
3447 case CPP_MINUS: return c == '-' || c == '>';
3448 case CPP_DIV: return c == '/' || c == '*'; /* Comments. */
3449 case CPP_MOD: return c == ':' || c == '>';
3450 case CPP_AND: return c == '&';
3451 case CPP_OR: return c == '|';
3452 case CPP_COLON: return c == ':' || c == '>';
3453 case CPP_DEREF: return c == '*';
3454 case CPP_DOT: return c == '.' || c == '%' || b == CPP_NUMBER;
3455 case CPP_HASH: return c == '#' || c == '%'; /* Digraph form. */
3456 case CPP_NAME: return ((b == CPP_NUMBER
3457 && name_p (pfile, &token2->val.str))
3458 || b == CPP_NAME
3459 || b == CPP_CHAR || b == CPP_STRING); /* L */
3460 case CPP_NUMBER: return (b == CPP_NUMBER || b == CPP_NAME
3461 || c == '.' || c == '+' || c == '-');
3462 /* UCNs */
3463 case CPP_OTHER: return ((token1->val.str.text[0] == '\\'
3464 && b == CPP_NAME)
3465 || (CPP_OPTION (pfile, objc)
3466 && token1->val.str.text[0] == '@'
3467 && (b == CPP_NAME || b == CPP_STRING)));
3468 case CPP_STRING:
3469 case CPP_WSTRING:
3470 case CPP_UTF8STRING:
3471 case CPP_STRING16:
3472 case CPP_STRING32: return (CPP_OPTION (pfile, user_literals)
3473 && (b == CPP_NAME
3474 || (TOKEN_SPELL (token2) == SPELL_LITERAL
3475 && ISIDST (token2->val.str.text[0]))));
3477 default: break;
3480 return 0;
3483 /* Output all the remaining tokens on the current line, and a newline
3484 character, to FP. Leading whitespace is removed. If there are
3485 macros, special token padding is not performed. */
3486 void
3487 cpp_output_line (cpp_reader *pfile, FILE *fp)
3489 const cpp_token *token;
3491 token = cpp_get_token (pfile);
3492 while (token->type != CPP_EOF)
3494 cpp_output_token (token, fp);
3495 token = cpp_get_token (pfile);
3496 if (token->flags & PREV_WHITE)
3497 putc (' ', fp);
3500 putc ('\n', fp);
3503 /* Return a string representation of all the remaining tokens on the
3504 current line. The result is allocated using xmalloc and must be
3505 freed by the caller. */
3506 unsigned char *
3507 cpp_output_line_to_string (cpp_reader *pfile, const unsigned char *dir_name)
3509 const cpp_token *token;
3510 unsigned int out = dir_name ? ustrlen (dir_name) : 0;
3511 unsigned int alloced = 120 + out;
3512 unsigned char *result = (unsigned char *) xmalloc (alloced);
3514 /* If DIR_NAME is empty, there are no initial contents. */
3515 if (dir_name)
3517 sprintf ((char *) result, "#%s ", dir_name);
3518 out += 2;
3521 token = cpp_get_token (pfile);
3522 while (token->type != CPP_EOF)
3524 unsigned char *last;
3525 /* Include room for a possible space and the terminating nul. */
3526 unsigned int len = cpp_token_len (token) + 2;
3528 if (out + len > alloced)
3530 alloced *= 2;
3531 if (out + len > alloced)
3532 alloced = out + len;
3533 result = (unsigned char *) xrealloc (result, alloced);
3536 last = cpp_spell_token (pfile, token, &result[out], 0);
3537 out = last - result;
3539 token = cpp_get_token (pfile);
3540 if (token->flags & PREV_WHITE)
3541 result[out++] = ' ';
3544 result[out] = '\0';
3545 return result;
3548 /* Memory buffers. Changing these three constants can have a dramatic
3549 effect on performance. The values here are reasonable defaults,
3550 but might be tuned. If you adjust them, be sure to test across a
3551 range of uses of cpplib, including heavy nested function-like macro
3552 expansion. Also check the change in peak memory usage (NJAMD is a
3553 good tool for this). */
3554 #define MIN_BUFF_SIZE 8000
3555 #define BUFF_SIZE_UPPER_BOUND(MIN_SIZE) (MIN_BUFF_SIZE + (MIN_SIZE) * 3 / 2)
3556 #define EXTENDED_BUFF_SIZE(BUFF, MIN_EXTRA) \
3557 (MIN_EXTRA + ((BUFF)->limit - (BUFF)->cur) * 2)
3559 #if MIN_BUFF_SIZE > BUFF_SIZE_UPPER_BOUND (0)
3560 #error BUFF_SIZE_UPPER_BOUND must be at least as large as MIN_BUFF_SIZE!
3561 #endif
3563 /* Create a new allocation buffer. Place the control block at the end
3564 of the buffer, so that buffer overflows will cause immediate chaos. */
3565 static _cpp_buff *
3566 new_buff (size_t len)
3568 _cpp_buff *result;
3569 unsigned char *base;
3571 if (len < MIN_BUFF_SIZE)
3572 len = MIN_BUFF_SIZE;
3573 len = CPP_ALIGN (len);
3575 #ifdef ENABLE_VALGRIND_ANNOTATIONS
3576 /* Valgrind warns about uses of interior pointers, so put _cpp_buff
3577 struct first. */
3578 size_t slen = CPP_ALIGN2 (sizeof (_cpp_buff), 2 * DEFAULT_ALIGNMENT);
3579 base = XNEWVEC (unsigned char, len + slen);
3580 result = (_cpp_buff *) base;
3581 base += slen;
3582 #else
3583 base = XNEWVEC (unsigned char, len + sizeof (_cpp_buff));
3584 result = (_cpp_buff *) (base + len);
3585 #endif
3586 result->base = base;
3587 result->cur = base;
3588 result->limit = base + len;
3589 result->next = NULL;
3590 return result;
3593 /* Place a chain of unwanted allocation buffers on the free list. */
3594 void
3595 _cpp_release_buff (cpp_reader *pfile, _cpp_buff *buff)
3597 _cpp_buff *end = buff;
3599 while (end->next)
3600 end = end->next;
3601 end->next = pfile->free_buffs;
3602 pfile->free_buffs = buff;
3605 /* Return a free buffer of size at least MIN_SIZE. */
3606 _cpp_buff *
3607 _cpp_get_buff (cpp_reader *pfile, size_t min_size)
3609 _cpp_buff *result, **p;
3611 for (p = &pfile->free_buffs;; p = &(*p)->next)
3613 size_t size;
3615 if (*p == NULL)
3616 return new_buff (min_size);
3617 result = *p;
3618 size = result->limit - result->base;
3619 /* Return a buffer that's big enough, but don't waste one that's
3620 way too big. */
3621 if (size >= min_size && size <= BUFF_SIZE_UPPER_BOUND (min_size))
3622 break;
3625 *p = result->next;
3626 result->next = NULL;
3627 result->cur = result->base;
3628 return result;
3631 /* Creates a new buffer with enough space to hold the uncommitted
3632 remaining bytes of BUFF, and at least MIN_EXTRA more bytes. Copies
3633 the excess bytes to the new buffer. Chains the new buffer after
3634 BUFF, and returns the new buffer. */
3635 _cpp_buff *
3636 _cpp_append_extend_buff (cpp_reader *pfile, _cpp_buff *buff, size_t min_extra)
3638 size_t size = EXTENDED_BUFF_SIZE (buff, min_extra);
3639 _cpp_buff *new_buff = _cpp_get_buff (pfile, size);
3641 buff->next = new_buff;
3642 memcpy (new_buff->base, buff->cur, BUFF_ROOM (buff));
3643 return new_buff;
3646 /* Creates a new buffer with enough space to hold the uncommitted
3647 remaining bytes of the buffer pointed to by BUFF, and at least
3648 MIN_EXTRA more bytes. Copies the excess bytes to the new buffer.
3649 Chains the new buffer before the buffer pointed to by BUFF, and
3650 updates the pointer to point to the new buffer. */
3651 void
3652 _cpp_extend_buff (cpp_reader *pfile, _cpp_buff **pbuff, size_t min_extra)
3654 _cpp_buff *new_buff, *old_buff = *pbuff;
3655 size_t size = EXTENDED_BUFF_SIZE (old_buff, min_extra);
3657 new_buff = _cpp_get_buff (pfile, size);
3658 memcpy (new_buff->base, old_buff->cur, BUFF_ROOM (old_buff));
3659 new_buff->next = old_buff;
3660 *pbuff = new_buff;
3663 /* Free a chain of buffers starting at BUFF. */
3664 void
3665 _cpp_free_buff (_cpp_buff *buff)
3667 _cpp_buff *next;
3669 for (; buff; buff = next)
3671 next = buff->next;
3672 #ifdef ENABLE_VALGRIND_ANNOTATIONS
3673 free (buff);
3674 #else
3675 free (buff->base);
3676 #endif
3680 /* Allocate permanent, unaligned storage of length LEN. */
3681 unsigned char *
3682 _cpp_unaligned_alloc (cpp_reader *pfile, size_t len)
3684 _cpp_buff *buff = pfile->u_buff;
3685 unsigned char *result = buff->cur;
3687 if (len > (size_t) (buff->limit - result))
3689 buff = _cpp_get_buff (pfile, len);
3690 buff->next = pfile->u_buff;
3691 pfile->u_buff = buff;
3692 result = buff->cur;
3695 buff->cur = result + len;
3696 return result;
3699 /* Allocate permanent, unaligned storage of length LEN from a_buff.
3700 That buffer is used for growing allocations when saving macro
3701 replacement lists in a #define, and when parsing an answer to an
3702 assertion in #assert, #unassert or #if (and therefore possibly
3703 whilst expanding macros). It therefore must not be used by any
3704 code that they might call: specifically the lexer and the guts of
3705 the macro expander.
3707 All existing other uses clearly fit this restriction: storing
3708 registered pragmas during initialization. */
3709 unsigned char *
3710 _cpp_aligned_alloc (cpp_reader *pfile, size_t len)
3712 _cpp_buff *buff = pfile->a_buff;
3713 unsigned char *result = buff->cur;
3715 if (len > (size_t) (buff->limit - result))
3717 buff = _cpp_get_buff (pfile, len);
3718 buff->next = pfile->a_buff;
3719 pfile->a_buff = buff;
3720 result = buff->cur;
3723 buff->cur = result + len;
3724 return result;
3727 /* Say which field of TOK is in use. */
3729 enum cpp_token_fld_kind
3730 cpp_token_val_index (const cpp_token *tok)
3732 switch (TOKEN_SPELL (tok))
3734 case SPELL_IDENT:
3735 return CPP_TOKEN_FLD_NODE;
3736 case SPELL_LITERAL:
3737 return CPP_TOKEN_FLD_STR;
3738 case SPELL_OPERATOR:
3739 if (tok->type == CPP_PASTE)
3740 return CPP_TOKEN_FLD_TOKEN_NO;
3741 else
3742 return CPP_TOKEN_FLD_NONE;
3743 case SPELL_NONE:
3744 if (tok->type == CPP_MACRO_ARG)
3745 return CPP_TOKEN_FLD_ARG_NO;
3746 else if (tok->type == CPP_PADDING)
3747 return CPP_TOKEN_FLD_SOURCE;
3748 else if (tok->type == CPP_PRAGMA)
3749 return CPP_TOKEN_FLD_PRAGMA;
3750 /* fall through */
3751 default:
3752 return CPP_TOKEN_FLD_NONE;
3756 /* All tokens lexed in R after calling this function will be forced to have
3757 their source_location the same as the location referenced by P, until
3758 cpp_stop_forcing_token_locations is called for R. */
3760 void
3761 cpp_force_token_locations (cpp_reader *r, source_location *p)
3763 r->forced_token_location_p = p;
3766 /* Go back to assigning locations naturally for lexed tokens. */
3768 void
3769 cpp_stop_forcing_token_locations (cpp_reader *r)
3771 r->forced_token_location_p = NULL;