5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
6 * this software and associated documentation files (the "Software"), to deal in
7 * the Software without restriction, including without limitation the rights to
8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is furnished to do
10 * so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in all
13 * copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 /* a copy from the lexer */
49 /* yes we need an extra flag since `#define FOO x` is not the same as `#define FOO() x` */
61 ppcondition *conditions;
65 #define ftepp_tokval(f) ((f)->lex->tok.value)
66 #define ftepp_ctx(f) ((f)->lex->tok.ctx)
68 static void ftepp_errorat(ftepp_t *ftepp, lex_ctx ctx, const char *fmt, ...)
75 con_vprintmsg(LVL_ERROR, ctx.file, ctx.line, "error", fmt, ap);
79 static void ftepp_error(ftepp_t *ftepp, const char *fmt, ...)
86 con_vprintmsg(LVL_ERROR, ftepp->lex->tok.ctx.file, ftepp->lex->tok.ctx.line, "error", fmt, ap);
90 pptoken *pptoken_make(ftepp_t *ftepp)
92 pptoken *token = (pptoken*)mem_a(sizeof(pptoken));
93 token->token = ftepp->token;
94 if (token->token == TOKEN_WHITE)
95 token->value = util_strdup(" ");
97 token->value = util_strdup(ftepp_tokval(ftepp));
98 memcpy(&token->constval, &ftepp->lex->tok.constval, sizeof(token->constval));
102 void pptoken_delete(pptoken *self)
108 ppmacro *ppmacro_new(lex_ctx ctx, const char *name)
110 ppmacro *macro = (ppmacro*)mem_a(sizeof(ppmacro));
111 memset(macro, 0, sizeof(*macro));
112 macro->name = util_strdup(name);
116 void ppmacro_delete(ppmacro *self)
119 for (i = 0; i < vec_size(self->params); ++i)
120 mem_d(self->params[i]);
121 vec_free(self->params);
122 for (i = 0; i < vec_size(self->output); ++i)
123 pptoken_delete(self->output[i]);
124 vec_free(self->output);
129 ftepp_t* ftepp_init()
133 ftepp = (ftepp_t*)mem_a(sizeof(*ftepp));
134 memset(ftepp, 0, sizeof(*ftepp));
139 void ftepp_delete(ftepp_t *self)
142 for (i = 0; i < vec_size(self->macros); ++i)
143 ppmacro_delete(self->macros[i]);
144 vec_free(self->macros);
145 vec_free(self->conditions);
146 lex_close(self->lex);
150 static void ftepp_out(ftepp_t *ftepp, const char *str, bool ignore_cond)
153 !vec_size(ftepp->conditions) ||
154 vec_last(ftepp->conditions).on)
160 ppmacro* ftepp_macro_find(ftepp_t *ftepp, const char *name)
163 for (i = 0; i < vec_size(ftepp->macros); ++i) {
164 if (!strcmp(name, ftepp->macros[i]->name))
165 return ftepp->macros[i];
170 static inline int ftepp_next(ftepp_t *ftepp)
172 return (ftepp->token = lex_do(ftepp->lex));
175 /* Important: this does not skip newlines! */
176 static bool ftepp_skipspace(ftepp_t *ftepp)
178 if (ftepp->token != TOKEN_WHITE)
180 while (ftepp_next(ftepp) == TOKEN_WHITE) {}
181 if (ftepp->token >= TOKEN_EOF) {
182 ftepp_error(ftepp, "unexpected end of preprocessor directive");
188 /* this one skips EOLs as well */
189 static bool ftepp_skipallwhite(ftepp_t *ftepp)
191 if (ftepp->token != TOKEN_WHITE && ftepp->token != TOKEN_EOL)
195 } while (ftepp->token == TOKEN_WHITE || ftepp->token == TOKEN_EOL);
196 if (ftepp->token >= TOKEN_EOF) {
197 ftepp_error(ftepp, "unexpected end of preprocessor directive");
204 * The huge macro parsing code...
206 static bool ftepp_define_params(ftepp_t *ftepp, ppmacro *macro)
210 if (!ftepp_skipspace(ftepp))
212 if (ftepp->token == ')')
214 switch (ftepp->token) {
220 ftepp_error(ftepp, "unexpected token in parameter list");
223 vec_push(macro->params, util_strdup(ftepp_tokval(ftepp)));
225 if (!ftepp_skipspace(ftepp))
227 } while (ftepp->token == ',');
228 if (ftepp->token != ')') {
229 ftepp_error(ftepp, "expected closing paren after macro parameter list");
233 /* skipspace happens in ftepp_define */
237 static bool ftepp_define_body(ftepp_t *ftepp, ppmacro *macro)
240 while (ftepp->token != TOKEN_EOL && ftepp->token < TOKEN_EOF) {
241 ptok = pptoken_make(ftepp);
242 vec_push(macro->output, ptok);
245 if (ftepp->token != TOKEN_EOL) {
246 ftepp_error(ftepp, "unexpected junk after macro or unexpected end of file");
252 static bool ftepp_define(ftepp_t *ftepp)
255 (void)ftepp_next(ftepp);
256 if (!ftepp_skipspace(ftepp))
259 switch (ftepp->token) {
263 macro = ppmacro_new(ftepp_ctx(ftepp), ftepp_tokval(ftepp));
266 ftepp_error(ftepp, "expected macro name");
270 (void)ftepp_next(ftepp);
272 if (ftepp->token == '(') {
273 macro->has_params = true;
274 if (!ftepp_define_params(ftepp, macro))
278 if (!ftepp_skipspace(ftepp))
281 if (!ftepp_define_body(ftepp, macro))
284 vec_push(ftepp->macros, macro);
288 static bool ftepp_macro_call(ftepp_t *ftepp, ppmacro *macro)
293 if (!macro->has_params) {
294 for (o = 0; o < vec_size(macro->output); ++o) {
295 ftepp_out(ftepp, macro->output[o]->value, false);
300 if (!ftepp_skipallwhite(ftepp))
306 * When a macro is used we have to handle parameters as well
307 * as special-concatenation via ## or stringification via #
311 * #if - the FTEQCC way:
312 * defined(FOO) => true if FOO was #defined regardless of parameters or contents
313 * <numbers> => True if the number is not 0
314 * !<factor> => True if the factor yields false
315 * !!<factor> => ERROR on 2 or more unary nots
316 * <macro> => becomes the macro's FIRST token regardless of parameters
317 * <e> && <e> => True if both expressions are true
318 * <e> || <e> => True if either expression is true
320 * <ident> => False (remember for macros the <macro> rule applies instead)
321 * Unary + and - are weird and wrong in fteqcc so we don't allow them
322 * parenthesis in expressions are allowed
323 * parameter lists on macros are errors
324 * No mathematical calculations are executed
326 static bool ftepp_if_expr(ftepp_t *ftepp, bool *out)
331 if (!ftepp_skipspace(ftepp))
334 while (ftepp->token == '!') {
337 if (!ftepp_skipspace(ftepp))
341 switch (ftepp->token) {
345 if (!strcmp(ftepp_tokval(ftepp), "defined")) {
347 if (!ftepp_skipspace(ftepp))
349 if (ftepp->token != '(') {
350 ftepp_error(ftepp, "`defined` keyword in #if requires a macro name in parenthesis");
354 if (!ftepp_skipspace(ftepp))
356 if (ftepp->token != TOKEN_IDENT &&
357 ftepp->token != TOKEN_TYPENAME &&
358 ftepp->token != TOKEN_KEYWORD)
360 ftepp_error(ftepp, "defined() used on an unexpected token type");
363 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
366 if (!ftepp_skipspace(ftepp))
368 if (ftepp->token != ')') {
369 ftepp_error(ftepp, "expected closing paren");
375 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
376 if (!macro || !vec_size(macro->output)) {
379 /* This does not expand recursively! */
380 switch (macro->output[0]->token) {
382 *out = !!(macro->output[0]->constval.f);
384 case TOKEN_FLOATCONST:
385 *out = !!(macro->output[0]->constval.f);
393 case TOKEN_STRINGCONST:
397 *out = !!(ftepp->lex->tok.constval.i);
399 case TOKEN_FLOATCONST:
400 *out = !!(ftepp->lex->tok.constval.f);
405 if (!ftepp_if_expr(ftepp, out))
407 if (ftepp->token != ')') {
408 ftepp_error(ftepp, "expected closing paren in #if expression");
414 ftepp_error(ftepp, "junk in #if");
420 ftepp->lex->flags.noops = false;
422 if (!ftepp_skipspace(ftepp))
424 ftepp->lex->flags.noops = true;
426 if (ftepp->token == ')')
429 if (ftepp->token != TOKEN_OPERATOR)
432 if (!strcmp(ftepp_tokval(ftepp), "&&") ||
433 !strcmp(ftepp_tokval(ftepp), "||"))
436 char opc = ftepp_tokval(ftepp)[0];
439 if (!ftepp_if_expr(ftepp, &next))
449 ftepp_error(ftepp, "junk after #if");
454 static bool ftepp_if(ftepp_t *ftepp, ppcondition *cond)
458 memset(cond, 0, sizeof(*cond));
459 (void)ftepp_next(ftepp);
461 if (!ftepp_skipspace(ftepp))
463 if (ftepp->token == TOKEN_EOL) {
464 ftepp_error(ftepp, "expected expression for #if-directive");
468 if (!ftepp_if_expr(ftepp, &result))
476 * ifdef is rather simple
478 static bool ftepp_ifdef(ftepp_t *ftepp, ppcondition *cond)
481 memset(cond, 0, sizeof(*cond));
482 (void)ftepp_next(ftepp);
483 if (!ftepp_skipspace(ftepp))
486 switch (ftepp->token) {
490 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
493 ftepp_error(ftepp, "expected macro name");
497 (void)ftepp_next(ftepp);
498 if (!ftepp_skipspace(ftepp))
500 if (ftepp->token != TOKEN_EOL) {
501 ftepp_error(ftepp, "stray tokens after #ifdef");
508 /* Basic structure handlers */
509 static bool ftepp_else_allowed(ftepp_t *ftepp)
511 if (!vec_size(ftepp->conditions)) {
512 ftepp_error(ftepp, "#else without #if");
515 if (vec_last(ftepp->conditions).had_else) {
516 ftepp_error(ftepp, "multiple #else for a single #if");
522 static bool ftepp_hash(ftepp_t *ftepp)
527 lex_ctx ctx = ftepp_ctx(ftepp);
529 if (!ftepp_skipspace(ftepp))
532 switch (ftepp->token) {
536 if (!strcmp(ftepp_tokval(ftepp), "define")) {
537 return ftepp_define(ftepp);
539 else if (!strcmp(ftepp_tokval(ftepp), "ifdef")) {
540 if (!ftepp_ifdef(ftepp, &cond))
542 cond.was_on = cond.on;
543 vec_push(ftepp->conditions, cond);
546 else if (!strcmp(ftepp_tokval(ftepp), "ifndef")) {
547 if (!ftepp_ifdef(ftepp, &cond))
550 cond.was_on = cond.on;
551 vec_push(ftepp->conditions, cond);
554 else if (!strcmp(ftepp_tokval(ftepp), "elifdef")) {
555 if (!ftepp_else_allowed(ftepp))
557 if (!ftepp_ifdef(ftepp, &cond))
559 pc = &vec_last(ftepp->conditions);
560 pc->on = !pc->was_on && cond.on;
561 pc->was_on = pc->was_on || pc->on;
564 else if (!strcmp(ftepp_tokval(ftepp), "elifndef")) {
565 if (!ftepp_else_allowed(ftepp))
567 if (!ftepp_ifdef(ftepp, &cond))
570 pc = &vec_last(ftepp->conditions);
571 pc->on = !pc->was_on && cond.on;
572 pc->was_on = pc->was_on || pc->on;
575 else if (!strcmp(ftepp_tokval(ftepp), "elif")) {
576 if (!ftepp_else_allowed(ftepp))
578 if (!ftepp_if(ftepp, &cond))
580 pc = &vec_last(ftepp->conditions);
581 pc->on = !pc->was_on && cond.on;
582 pc->was_on = pc->was_on || pc->on;
585 else if (!strcmp(ftepp_tokval(ftepp), "if")) {
586 if (!ftepp_if(ftepp, &cond))
588 cond.was_on = cond.on;
589 vec_push(ftepp->conditions, cond);
592 else if (!strcmp(ftepp_tokval(ftepp), "else")) {
593 if (!ftepp_else_allowed(ftepp))
595 pc = &vec_last(ftepp->conditions);
596 pc->on = !pc->was_on;
601 else if (!strcmp(ftepp_tokval(ftepp), "endif")) {
602 if (!vec_size(ftepp->conditions)) {
603 ftepp_error(ftepp, "#endif without #if");
606 vec_pop(ftepp->conditions);
611 ftepp_error(ftepp, "unrecognized preprocessor directive: `%s`", ftepp_tokval(ftepp));
616 ftepp_error(ftepp, "unexpected preprocessor token: `%s`", ftepp_tokval(ftepp));
619 ftepp_errorat(ftepp, ctx, "empty preprocessor directive");
622 ftepp_error(ftepp, "missing newline at end of file", ftepp_tokval(ftepp));
625 if (!ftepp_skipspace(ftepp))
630 static bool ftepp_preprocess(ftepp_t *ftepp)
635 ftepp->lex->flags.preprocessing = true;
636 ftepp->lex->flags.mergelines = false;
637 ftepp->lex->flags.noops = true;
642 if (ftepp->token >= TOKEN_EOF)
645 ftepp->newline = newline;
648 switch (ftepp->token) {
652 macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
654 ftepp_out(ftepp, ftepp_tokval(ftepp), false);
658 if (!ftepp_macro_call(ftepp, macro))
659 ftepp->token = TOKEN_ERROR;
662 if (!ftepp->newline) {
663 ftepp_out(ftepp, ftepp_tokval(ftepp), false);
667 ftepp->lex->flags.mergelines = true;
668 if (ftepp_next(ftepp) >= TOKEN_EOF) {
669 ftepp_error(ftepp, "error in preprocessor directive");
670 ftepp->token = TOKEN_ERROR;
673 if (!ftepp_hash(ftepp))
674 ftepp->token = TOKEN_ERROR;
675 ftepp->lex->flags.mergelines = false;
679 ftepp_out(ftepp, "\n", true);
683 ftepp_out(ftepp, ftepp_tokval(ftepp), false);
687 } while (!ftepp->errors && ftepp->token < TOKEN_EOF);
689 newline = ftepp->token == TOKEN_EOF;
694 bool ftepp_preprocess_file(const char *filename)
696 ftepp_t *ftepp = ftepp_init();
697 ftepp->lex = lex_open(filename);
699 con_out("failed to open file \"%s\"\n", filename);
702 return ftepp_preprocess(ftepp);
705 bool ftepp_preprocess_string(const char *name, const char *str)
707 ftepp_t *ftepp = ftepp_init();
708 ftepp->lex = lex_open_string(str, strlen(str), name);
710 con_out("failed to create lexer for string \"%s\"\n", name);
713 return ftepp_preprocess(ftepp);