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[m6w6/ext-psi] / src / cpp_tokiter.c
1 /*******************************************************************************
2 Copyright (c) 2017, Michael Wallner <mike@php.net>.
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
7
8 * Redistributions of source code must retain the above copyright notice,
9 this list of conditions and the following disclaimer.
10 * Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13
14 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
15 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
18 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
21 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *******************************************************************************/
25
26 #include "php_psi_stdinc.h"
27
28 #include "cpp.h"
29 #include "parser.h"
30
31 #if PSI_CPP_DEBUG > 1
32 void psi_cpp_tokiter_dump(int fd, struct psi_cpp *cpp)
33 {
34 size_t i = cpp->index;
35 struct psi_token *T;
36
37 if (i > 20) {
38 i -= 20;
39 } else {
40 i = 0;
41 }
42 while (psi_plist_get(cpp->tokens, i, &T)) {
43 dprintf(fd, "PSI: CPP tokens %5zu %c ", i, cpp->index == i ? '*' : ' ');
44 psi_token_dump(fd, T);
45 if (i >= cpp->index + 10) {
46 dprintf(fd, "PSI: CPP tokens .....\n");
47 break;
48 }
49 ++i;
50 }
51 }
52 #endif
53
54 void psi_cpp_tokiter_reset(struct psi_cpp *cpp)
55 {
56 #if PSI_CPP_DEBUG
57 fprintf(stderr, "PSI: CPP reset (%zu tokens)\n", psi_plist_count(cpp->tokens));
58 # if PSI_CPP_DEBUG > 1
59 psi_cpp_tokiter_dump(2, cpp);
60 # endif
61 #endif
62 cpp->index = 0;
63 cpp->expanded = 0;
64 }
65
66 bool psi_cpp_tokiter_seek(struct psi_cpp *cpp, size_t index)
67 {
68 if (index < psi_plist_count(cpp->tokens)) {
69 cpp->index = index;
70 return true;
71 }
72 return false;
73 }
74
75 struct psi_token *psi_cpp_tokiter_current(struct psi_cpp *cpp)
76 {
77 struct psi_token *current = NULL;
78 bool found = psi_plist_get(cpp->tokens, cpp->index, &current);
79
80 assert(found);
81
82 return current;
83 }
84
85 size_t psi_cpp_tokiter_index(struct psi_cpp *cpp)
86 {
87 return cpp->index;
88 }
89
90 void psi_cpp_tokiter_next(struct psi_cpp *cpp)
91 {
92 #if 0 && PSI_CPP_DEBUG
93 fprintf(stderr, "PSI: CPP next -> index=%zu -> index=%zu\n", cpp->index, cpp->index+1);
94 #endif
95 ++cpp->index;
96 }
97
98 void psi_cpp_tokiter_prev(struct psi_cpp *cpp)
99 {
100 #if 0 && PSI_CPP_DEBUG
101 fprintf(stderr, "PSI: CPP prev -> index=%zu -> index=%zu\n", cpp->index, cpp->index-1);
102 #endif
103 if (cpp->index) {
104 --cpp->index;
105 }
106 }
107
108 bool psi_cpp_tokiter_valid(struct psi_cpp *cpp)
109 {
110 #if 0 && PSI_CPP_DEBUG
111 fprintf(stderr, "PSI: CPP valid -> index=%zu -> %d\n", cpp->index, cpp->index < psi_plist_count(cpp->tokens));
112 #endif
113 return cpp->index < psi_plist_count(cpp->tokens);
114 }
115
116 bool psi_cpp_tokiter_del_cur(struct psi_cpp *cpp, bool free_token)
117 {
118 struct psi_token *cur = NULL;
119 bool deleted = psi_plist_del(cpp->tokens, cpp->index, &cur);
120 size_t count;
121
122 #if PSI_CPP_DEBUG
123 fprintf(stderr, "PSI: CPP del_cur -> index=%zu, del=%d, free=%d, count=%zu ",
124 cpp->index, (int) deleted, (int) free_token, psi_plist_count(cpp->tokens));
125 if (cur) {
126 psi_token_dump(2, cur);
127 } else {
128 fprintf(stderr, "NULL\n");
129 }
130 #endif
131 if (free_token) {
132 psi_token_free(&cur);
133 }
134 count = psi_plist_count(cpp->tokens);
135 if (deleted && cpp->index >= count) {
136 if (count > 0) {
137 cpp->index = count - 1;
138 } else {
139 cpp->index = 0;
140 }
141 }
142 return deleted;
143 }
144
145 bool psi_cpp_tokiter_del_range(struct psi_cpp *cpp, size_t offset, size_t num_eles, bool free_tokens)
146 {
147 struct psi_token **ptr;
148 bool deleted;
149
150 if (free_tokens) {
151 ptr = calloc(num_eles, sizeof(*ptr));
152 } else {
153 ptr = NULL;
154 }
155
156 #if PSI_CPP_DEBUG
157 fprintf(stderr, "PSI: CPP del_range -> index=%zu, offset=%zu, num_eles=%zu, count=%zu\n",
158 cpp->index, offset, num_eles, psi_plist_count(cpp->tokens));
159 #endif
160
161 deleted = psi_plist_del_r(cpp->tokens, offset, num_eles, (void *) ptr);
162
163 if (deleted) {
164 size_t count = psi_plist_count(cpp->tokens);
165
166 if (cpp->index >= count) {
167 if (count > 0) {
168 cpp->index = count - 1;
169 } else {
170 cpp->index = 0;
171 }
172 }
173
174 if (free_tokens) {
175 while (num_eles--) {
176 psi_token_free(&ptr[num_eles]);
177 }
178 free(ptr);
179 }
180 }
181 return deleted;
182 }
183
184 bool psi_cpp_tokiter_ins_cur(struct psi_cpp *cpp, struct psi_token *tok)
185 {
186 struct psi_plist *tokens = psi_plist_ins(cpp->tokens, cpp->index, &tok);
187
188 #if PSI_CPP_DEBUG
189 fprintf(stderr, "PSI: CPP ins_cur -> index=%zu ", cpp->index);
190 psi_token_dump(2, tok);
191 #endif
192
193 if (!tokens) {
194 return false;
195 }
196 cpp->tokens = tokens;
197 return true;
198 }
199
200 bool psi_cpp_tokiter_ins_range(struct psi_cpp *cpp, size_t offset,
201 size_t num_eles, void **eles)
202 {
203 struct psi_plist *tokens;
204
205 if (!num_eles) {
206 return true;
207 }
208
209 tokens = psi_plist_ins_r(cpp->tokens, offset, num_eles, eles);
210
211 #if PSI_CPP_DEBUG
212 fprintf(stderr, "PSI: CPP ins_range -> index=%zu, offset=%zu, num_eles=%zu, count=%zu\n",
213 cpp->index, offset, num_eles, psi_plist_count(tokens));
214 #endif
215
216 if (!tokens) {
217 return false;
218 }
219 cpp->tokens = tokens;
220 return true;
221 }
222
223 bool psi_cpp_tokiter_defined(struct psi_cpp *cpp)
224 {
225 if (psi_cpp_tokiter_valid(cpp)) {
226 struct psi_token *current = psi_cpp_tokiter_current(cpp);
227
228 return psi_cpp_defined(cpp, current);
229 }
230
231 return false;
232 }
233
234 static size_t psi_cpp_tokiter_expand_tokens(struct psi_cpp *cpp,
235 struct psi_token *target, struct psi_plist *tokens)
236 {
237 if (tokens && psi_plist_count(tokens)) {
238 size_t i = 0, n = 0;
239 bool stringify = false, paste = false;
240 struct psi_token *tok, **exp_tokens = calloc(psi_plist_count(tokens), sizeof(*exp_tokens));
241
242 while (psi_plist_get(tokens, i++, &tok)) {
243 struct psi_token *new_tok;
244
245 if (tok->type == PSI_T_EOL) {
246 continue;
247 }
248 if (tok->type == PSI_T_HASH) {
249 stringify = true;
250 continue;
251 }
252 if (tok->type == PSI_T_CPP_PASTE) {
253 paste = true;
254 continue;
255 }
256
257 if (paste && n > 0 && exp_tokens[n - 1]) {
258 struct psi_token *tmp_tok, *old_tok = exp_tokens[n - 1];
259
260 tmp_tok = psi_token_init(old_tok->type, "", 0,
261 target->col, target->line,
262 target->file ? target->file->val : "");
263
264 new_tok = psi_token_cat(NULL, 3, tmp_tok, old_tok, tok);
265 psi_token_free(&old_tok);
266 psi_token_free(&tmp_tok);
267
268 exp_tokens[n - 1] = new_tok;
269 } else {
270 new_tok = psi_token_init(stringify ? PSI_T_QUOTED_STRING : tok->type,
271 tok->text->val, tok->text->len, target->col, target->line, target->file?:"");
272
273 exp_tokens[n++] = new_tok;
274 }
275
276 #if PSI_CPP_DEBUG
277 fprintf(stderr, "PSI: CPP expand > ");
278 psi_token_dump(2, tok);
279 #endif
280
281 paste = false;
282 stringify = false;
283 }
284 psi_cpp_tokiter_ins_range(cpp, psi_cpp_tokiter_index(cpp), n, (void *) exp_tokens);
285 free(exp_tokens);
286
287 return n;
288 } else {
289 return 0;
290 }
291 }
292
293 static void psi_cpp_tokiter_free_call_tokens(struct psi_plist **arg_tokens_list, size_t arg_count, bool free_tokens)
294 {
295 size_t i;
296
297 for (i = 0; i < arg_count; ++i) {
298 if (arg_tokens_list[i]) {
299 if (free_tokens) {
300 struct psi_token *tok;
301
302 while (psi_plist_pop(arg_tokens_list[i], &tok)) {
303 psi_token_free(&tok);
304 }
305 }
306 psi_plist_free(arg_tokens_list[i]);
307 }
308 }
309 free(arg_tokens_list);
310 }
311
312 static struct psi_plist **psi_cpp_tokiter_read_call_tokens(
313 struct psi_cpp *cpp, size_t arg_count)
314 {
315 size_t arg_index = 0, lparens = 1, rparens = 0;
316 struct psi_plist **arg_tokens = calloc(arg_count, sizeof(*arg_tokens));
317 struct psi_plist *free_tokens = psi_plist_init((psi_plist_dtor) psi_token_free);
318 struct psi_token *tok;
319
320 arg_tokens[0] = psi_plist_init(NULL);
321
322 /* next token must be a LPAREN for a macro call */
323 psi_cpp_tokiter_next(cpp);
324 tok = psi_cpp_tokiter_current(cpp);
325 if (!psi_cpp_tokiter_valid(cpp) || tok->type != PSI_T_LPAREN) {
326 goto fail;
327 }
328
329 /* free LPAREN on success */
330 free_tokens = psi_plist_add(free_tokens, &tok);
331
332 while (lparens > rparens) {
333 psi_cpp_tokiter_next(cpp);
334 if (!psi_cpp_tokiter_valid(cpp)) {
335 goto fail;
336 }
337 tok = psi_cpp_tokiter_current(cpp);
338
339 switch (tok->type) {
340 case PSI_T_LPAREN:
341 ++lparens;
342 arg_tokens[arg_index] = psi_plist_add(arg_tokens[arg_index], &tok);
343 break;
344 case PSI_T_RPAREN:
345 if (++rparens == lparens) {
346 /* closing RPAREN */
347 if (arg_index + 1 < arg_count) {
348 goto fail;
349 }
350 free_tokens = psi_plist_add(free_tokens, &tok);
351 } else {
352 arg_tokens[arg_index] = psi_plist_add(arg_tokens[arg_index], &tok);
353 }
354 break;
355 case PSI_T_COMMA:
356 if (1 == (lparens - rparens)) {
357 /* too many commas? */
358 if (++arg_index >= arg_count) {
359 goto fail;
360 }
361 free_tokens = psi_plist_add(free_tokens, &tok);
362 /* next arg */
363 arg_tokens[arg_index] = psi_plist_init(NULL);
364 } else {
365 arg_tokens[arg_index] = psi_plist_add(arg_tokens[arg_index], &tok);
366 }
367 break;
368 default:
369 arg_tokens[arg_index] = psi_plist_add(arg_tokens[arg_index], &tok);
370 }
371 }
372
373 psi_plist_free(free_tokens);
374 return arg_tokens;
375
376 fail:
377 psi_cpp_tokiter_free_call_tokens(arg_tokens, arg_count, false);
378 return NULL;
379 }
380
381 static void psi_cpp_tokiter_expand_call_tokens(struct psi_cpp *cpp,
382 struct psi_token *target, struct psi_cpp_macro_decl *macro,
383 struct psi_plist **arg_tokens_list)
384 {
385 size_t i;
386 struct psi_token *tok;
387 struct psi_plist *tokens = psi_plist_init(NULL);
388
389 for (i = 0; psi_plist_get(macro->tokens, i, &tok); ++i) {
390 struct psi_plist *arg_tokens = NULL;
391
392 if (tok->type == PSI_T_NAME) {
393 size_t s;
394 struct psi_token *arg_name;
395
396 for (s = 0; psi_plist_get(macro->sig, s, &arg_name); ++s) {
397 if (zend_string_equals(arg_name->text, tok->text)) {
398 arg_tokens = arg_tokens_list[s];
399 break;
400 }
401 }
402 }
403
404 if (arg_tokens) {
405 tokens = psi_plist_add_r(tokens, psi_plist_count(arg_tokens), psi_plist_eles(arg_tokens));
406 } else {
407 tokens = psi_plist_add(tokens, &tok);
408 }
409 }
410
411 psi_cpp_tokiter_expand_tokens(cpp, target, tokens);
412 psi_plist_free(tokens);
413 }
414
415 static bool psi_cpp_tokiter_expand_call(struct psi_cpp *cpp,
416 struct psi_token *target, struct psi_cpp_macro_decl *macro)
417 {
418 /* function-like macro
419 * #define FOO(a,b) a>b // macro->sig == {a, b}, macro->tokens = {a, >, b}
420 * # if FOO(1,2) // expands to if 1 > 2
421 */
422 size_t start = psi_cpp_tokiter_index(cpp);
423 struct psi_plist **arg_tokens_list;
424
425 /* read in tokens, until we have balanced parens */
426 arg_tokens_list = psi_cpp_tokiter_read_call_tokens(cpp, psi_plist_count(macro->sig));
427 if (!arg_tokens_list) {
428 psi_cpp_tokiter_seek(cpp, start);
429 return false;
430 }
431
432 /* ditch arg tokens */
433 psi_cpp_tokiter_del_range(cpp, start, psi_cpp_tokiter_index(cpp) - start + 1, false);
434 psi_cpp_tokiter_seek(cpp, start);
435
436 /* insert and expand macro tokens */
437 psi_cpp_tokiter_expand_call_tokens(cpp, target, macro, arg_tokens_list);
438 psi_cpp_tokiter_free_call_tokens(arg_tokens_list, psi_plist_count(macro->sig), true);
439
440 /* back to where we took off */
441 psi_cpp_tokiter_seek(cpp, start);
442
443 psi_token_free(&target);
444 ++cpp->expanded;
445 return true;
446 }
447
448 static bool psi_cpp_tokiter_expand_def(struct psi_cpp *cpp,
449 struct psi_token *target, struct psi_cpp_macro_decl *macro)
450 {
451 size_t index = psi_cpp_tokiter_index(cpp);
452
453 /* delete current token from stream */
454 psi_cpp_tokiter_del_cur(cpp, false);
455
456 if (index != psi_cpp_tokiter_index(cpp)) {
457 /* might have been last token */
458 psi_cpp_tokiter_next(cpp);
459 }
460 /* replace with tokens from macro */
461 psi_cpp_tokiter_expand_tokens(cpp, target, macro->tokens);
462
463 psi_token_free(&target);
464 ++cpp->expanded;
465 return true;
466 }
467
468 static inline int psi_cpp_tokiter_expand_cmp(struct psi_token *t,
469 struct psi_cpp_macro_decl *m)
470 {
471 if (psi_plist_count(m->tokens) == 1) {
472 struct psi_token *r;
473
474 psi_plist_get(m->tokens, 0, &r);
475
476 return !zend_string_equals(r->text, t->text);
477 }
478 return -1;
479 }
480
481 bool psi_cpp_tokiter_expand(struct psi_cpp *cpp)
482 {
483 if (psi_cpp_tokiter_valid(cpp)) {
484 struct psi_token *current = psi_cpp_tokiter_current(cpp);
485
486 if (current) {
487 struct psi_cpp_macro_decl *macro = zend_hash_find_ptr(
488 &cpp->defs, current->text);
489
490 /* don't expand itself */
491 if (macro && macro->token != current) {
492 #if PSI_CPP_DEBUG
493 fprintf(stderr, "PSI: CPP expand < ");
494 psi_token_dump(2, current);
495 #endif
496 if (macro->sig) {
497 return psi_cpp_tokiter_expand_call(cpp, current, macro);
498 } else if (psi_cpp_tokiter_expand_cmp(current, macro)) {
499 return psi_cpp_tokiter_expand_def(cpp, current, macro);
500 }
501 }
502 }
503 }
504 return false;
505 }
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