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don't register constants with its anon prefix
[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 (cur && free_token) {
132 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 if (ptr[num_eles]) {
177 free(ptr[num_eles]);
178 }
179 }
180 free(ptr);
181 }
182 }
183 return deleted;
184 }
185
186 bool psi_cpp_tokiter_ins_cur(struct psi_cpp *cpp, struct psi_token *tok)
187 {
188 struct psi_plist *tokens = psi_plist_ins(cpp->tokens, cpp->index, &tok);
189
190 #if PSI_CPP_DEBUG
191 fprintf(stderr, "PSI: CPP ins_cur -> index=%zu ", cpp->index);
192 psi_token_dump(2, tok);
193 #endif
194
195 if (!tokens) {
196 return false;
197 }
198 cpp->tokens = tokens;
199 return true;
200 }
201
202 bool psi_cpp_tokiter_ins_range(struct psi_cpp *cpp, size_t offset,
203 size_t num_eles, void **eles)
204 {
205 struct psi_plist *tokens;
206
207 if (!num_eles) {
208 return true;
209 }
210
211 tokens = psi_plist_ins_r(cpp->tokens, offset, num_eles, eles);
212
213 #if PSI_CPP_DEBUG
214 fprintf(stderr, "PSI: CPP ins_range -> index=%zu, offset=%zu, num_eles=%zu, count=%zu\n",
215 cpp->index, offset, num_eles, psi_plist_count(tokens));
216 #endif
217
218 if (!tokens) {
219 return false;
220 }
221 cpp->tokens = tokens;
222 return true;
223 }
224
225 bool psi_cpp_tokiter_defined(struct psi_cpp *cpp)
226 {
227 if (psi_cpp_tokiter_valid(cpp)) {
228 struct psi_token *current = psi_cpp_tokiter_current(cpp);
229
230 return psi_cpp_defined(cpp, current);
231 }
232
233 return false;
234 }
235
236 void psi_cpp_tokiter_expand_tokens(struct psi_cpp *cpp, struct psi_token *target,
237 struct psi_plist *tokens)
238 {
239 if (tokens && psi_plist_count(tokens)) {
240 size_t i = 0, n = 0;
241 bool stringify = false, paste = false;
242 struct psi_token *tok, **exp_tokens = calloc(psi_plist_count(tokens), sizeof(*exp_tokens));
243
244 while (psi_plist_get(tokens, i++, &tok)) {
245 struct psi_token *new_tok;
246
247 if (tok->type == PSI_T_EOL) {
248 continue;
249 }
250 if (tok->type == PSI_T_HASH) {
251 stringify = true;
252 continue;
253 }
254 if (tok->type == PSI_T_CPP_PASTE) {
255 paste = true;
256 continue;
257 }
258
259 if (paste && n > 0 && exp_tokens[n - 1]) {
260 struct psi_token *old_tok = exp_tokens[n - 1];
261
262 new_tok = psi_token_init(old_tok->type, "", 0,
263 target->col, target->line, target->file);
264
265 new_tok = psi_token_cat(NULL, 2, new_tok, old_tok, tok);
266 free(old_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, tok->size, 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 }
288
289 static void psi_cpp_tokiter_free_call_tokens(struct psi_plist **arg_tokens_list, size_t arg_count, bool free_tokens)
290 {
291 size_t i;
292
293 for (i = 0; i < arg_count; ++i) {
294 if (arg_tokens_list[i]) {
295 if (free_tokens) {
296 struct psi_token *tok;
297
298 while (psi_plist_pop(arg_tokens_list[i], &tok)) {
299 free(tok);
300 }
301 }
302 psi_plist_free(arg_tokens_list[i]);
303 }
304 }
305 free(arg_tokens_list);
306 }
307
308 static struct psi_plist **psi_cpp_tokiter_read_call_tokens(
309 struct psi_cpp *cpp, size_t arg_count)
310 {
311 size_t arg_index = 0, lparens = 1, rparens = 0;
312 struct psi_plist **arg_tokens = calloc(arg_count, sizeof(*arg_tokens));
313 struct psi_plist *free_tokens = psi_plist_init((psi_plist_dtor) psi_token_free);
314 struct psi_token *tok;
315
316 arg_tokens[0] = psi_plist_init(NULL);
317
318 /* free macro name token on success */
319 tok = psi_cpp_tokiter_current(cpp);
320 free_tokens = psi_plist_add(free_tokens, &tok);
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 (arg_name->size == tok->size) {
398 if (!memcmp(arg_name->text, tok->text, tok->size)) {
399 arg_tokens = arg_tokens_list[s];
400 break;
401 }
402 }
403 }
404 }
405
406 if (arg_tokens) {
407 tokens = psi_plist_add_r(tokens, psi_plist_count(arg_tokens), psi_plist_eles(arg_tokens));
408 } else {
409 tokens = psi_plist_add(tokens, &tok);
410 }
411 }
412
413 psi_cpp_tokiter_expand_tokens(cpp, target, tokens);
414 psi_plist_free(tokens);
415 }
416
417 static bool psi_cpp_tokiter_expand_call(struct psi_cpp *cpp,
418 struct psi_token *target, struct psi_cpp_macro_decl *macro)
419 {
420 /* function-like macro
421 * #define FOO(a,b) a>b // macro->sig == {a, b}, macro->tokens = {a, >, b}
422 * # if FOO(1,2) // expands to if 1 > 2
423 */
424 size_t start = psi_cpp_tokiter_index(cpp);
425 struct psi_plist **arg_tokens_list;
426
427 /* read in tokens, until we have balanced parens */
428 arg_tokens_list = psi_cpp_tokiter_read_call_tokens(cpp, psi_plist_count(macro->sig));
429 if (!arg_tokens_list) {
430 psi_cpp_tokiter_seek(cpp, start);
431 return false;
432 }
433
434 /* ditch arg tokens */
435 psi_cpp_tokiter_del_range(cpp, start, psi_cpp_tokiter_index(cpp) - start + 1, false);
436 psi_cpp_tokiter_seek(cpp, start);
437
438 /* insert and expand macro tokens */
439 psi_cpp_tokiter_expand_call_tokens(cpp, target, macro, arg_tokens_list);
440 psi_cpp_tokiter_free_call_tokens(arg_tokens_list, psi_plist_count(macro->sig), true);
441
442 /* back to where we took off */
443 psi_cpp_tokiter_seek(cpp, start);
444 ++cpp->expanded;
445 return true;
446 }
447
448 bool psi_cpp_tokiter_expand(struct psi_cpp *cpp)
449 {
450 if (psi_cpp_tokiter_valid(cpp)) {
451 struct psi_token *current = psi_cpp_tokiter_current(cpp);
452
453 if (current) {
454 struct psi_cpp_macro_decl *macro = zend_hash_str_find_ptr(
455 &cpp->defs, current->text, current->size);
456
457 /* don't expand itself */
458 if (macro && macro->token != current) {
459 #if PSI_CPP_DEBUG
460 fprintf(stderr, "PSI: CPP expand < ");
461 psi_token_dump(2, current);
462 #endif
463 if (macro->sig) {
464 return psi_cpp_tokiter_expand_call(cpp, current, macro);
465 } else {
466 size_t index = psi_cpp_tokiter_index(cpp);
467
468 /* delete current token from stream */
469 psi_cpp_tokiter_del_cur(cpp, false);
470
471 if (index != psi_cpp_tokiter_index(cpp)) {
472 /* might have been last token */
473 psi_cpp_tokiter_next(cpp);
474 }
475 /* replace with tokens from macro */
476 psi_cpp_tokiter_expand_tokens(cpp, current, macro->tokens);
477
478 free(current);
479 ++cpp->expanded;
480 return true;
481 }
482 }
483 }
484 }
485 return false;
486 }
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