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math: functions can return fuzzy range lists
[smatch.git] / smatch_flow.c
blob616fd4734e643db851cd44bd5f91fc9878521034
1 /*
2 * Copyright (C) 2006,2008 Dan Carpenter.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 */
17
18 #define _GNU_SOURCE 1
19 #include <unistd.h>
20 #include <stdio.h>
21 #include "token.h"
22 #include "scope.h"
23 #include "smatch.h"
24 #include "smatch_expression_stacks.h"
25 #include "smatch_extra.h"
26 #include "smatch_slist.h"
27
28 int __in_fake_assign;
29 int __in_fake_struct_assign;
30 int in_fake_env;
31 int final_pass;
32 int __inline_call;
33 struct expression *__inline_fn;
34
35 static int __smatch_lineno = 0;
36
37 static char *base_file;
38 static const char *filename;
39 static char *pathname;
40 static char *full_filename;
41 static char *full_base_file;
42 static char *cur_func;
43 static unsigned int loop_count;
44 static int last_goto_statement_handled;
45 int __expr_stmt_count;
46 int __in_function_def;
47 int __in_unmatched_hook;
48 static struct expression_list *switch_expr_stack = NULL;
49 static struct expression_list *post_op_stack = NULL;
50
51 static struct ptr_list *backup;
52
53 struct expression_list *big_expression_stack;
54 struct statement_list *big_statement_stack;
55 struct statement *__prev_stmt;
56 struct statement *__cur_stmt;
57 struct statement *__next_stmt;
58 int __in_pre_condition = 0;
59 int __bail_on_rest_of_function = 0;
60 static struct timeval fn_start_time;
61 static struct timeval outer_fn_start_time;
62 char *get_function(void) { return cur_func; }
63 int get_lineno(void) { return __smatch_lineno; }
64 int inside_loop(void) { return !!loop_count; }
65 int definitely_inside_loop(void) { return !!(loop_count & ~0x08000000); }
66 struct expression *get_switch_expr(void) { return top_expression(switch_expr_stack); }
67 int in_expression_statement(void) { return !!__expr_stmt_count; }
68
69 static void split_symlist(struct symbol_list *sym_list);
70 static void split_declaration(struct symbol_list *sym_list);
71 static void split_expr_list(struct expression_list *expr_list, struct expression *parent);
72 static void add_inline_function(struct symbol *sym);
73 static void parse_inline(struct expression *expr);
74
75 int option_assume_loops = 0;
76 int option_two_passes = 0;
77 struct symbol *cur_func_sym = NULL;
78 struct stree *global_states;
79
80 const unsigned long valid_ptr_min = 4096;
81 unsigned long valid_ptr_max = ULONG_MAX & ~(MTAG_OFFSET_MASK);
82 const sval_t valid_ptr_min_sval = {
83 .type = &ptr_ctype,
84 {.value = 4096},
85 };
86 sval_t valid_ptr_max_sval = {
87 .type = &ptr_ctype,
88 {.value = ULONG_MAX & ~(MTAG_OFFSET_MASK)},
89 };
90 struct range_list *valid_ptr_rl;
91
92 void alloc_valid_ptr_rl(void)
93 {
94 valid_ptr_max = sval_type_max(&ulong_ctype).value & ~(MTAG_OFFSET_MASK);
95 valid_ptr_max_sval.value = valid_ptr_max;
96
97 valid_ptr_rl = alloc_rl(valid_ptr_min_sval, valid_ptr_max_sval);
98 valid_ptr_rl = cast_rl(&ptr_ctype, valid_ptr_rl);
99 valid_ptr_rl = clone_rl_permanent(valid_ptr_rl);
100 }
101
102 int outside_of_function(void)
103 {
104 return cur_func_sym == NULL;
105 }
106
107 const char *get_filename(void)
108 {
109 if (option_info && option_full_path)
110 return full_base_file;
111 if (option_info)
112 return base_file;
113 if (option_full_path)
114 return full_filename;
115 return filename;
116 }
117
118 const char *get_base_file(void)
119 {
120 if (option_full_path)
121 return full_base_file;
122 return base_file;
123 }
124
125 static void set_position(struct position pos)
126 {
127 int len;
128 static int prev_stream = -1;
129
130 if (in_fake_env)
131 return;
132
133 if (pos.stream == 0 && pos.line == 0)
134 return;
135
136 __smatch_lineno = pos.line;
137
138 if (pos.stream == prev_stream)
139 return;
140
141 filename = stream_name(pos.stream);
142
143 free(full_filename);
144 pathname = getcwd(NULL, 0);
145 if (pathname) {
146 len = strlen(pathname) + 1 + strlen(filename) + 1;
147 full_filename = malloc(len);
148 snprintf(full_filename, len, "%s/%s", pathname, filename);
149 } else {
150 full_filename = alloc_string(filename);
151 }
152 free(pathname);
153 }
154
155 int is_assigned_call(struct expression *expr)
156 {
157 struct expression *parent = expr_get_parent_expr(expr);
158
159 if (parent &&
160 parent->type == EXPR_ASSIGNMENT &&
161 parent->op == '=' &&
162 strip_expr(parent->right) == expr)
163 return 1;
164
165 return 0;
166 }
167
168 static int is_inline_func(struct expression *expr)
169 {
170 if (expr->type != EXPR_SYMBOL || !expr->symbol)
171 return 0;
172 if (expr->symbol->ctype.modifiers & MOD_INLINE)
173 return 1;
174 return 0;
175 }
176
177 static int is_noreturn_func(struct expression *expr)
178 {
179 if (expr->type != EXPR_SYMBOL || !expr->symbol)
180 return 0;
181 if (expr->symbol->ctype.modifiers & MOD_NORETURN)
182 return 1;
183 return 0;
184 }
185
186 static int inline_budget = 20;
187
188 int inlinable(struct expression *expr)
189 {
190 struct symbol *sym;
191 struct statement *last_stmt = NULL;
192
193 if (__inline_fn) /* don't nest */
194 return 0;
195
196 if (expr->type != EXPR_SYMBOL || !expr->symbol)
197 return 0;
198 if (is_no_inline_function(expr->symbol->ident->name))
199 return 0;
200 sym = get_base_type(expr->symbol);
201 if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
202 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) > 10)
203 return 0;
204 if (sym->stmt->type != STMT_COMPOUND)
205 return 0;
206 last_stmt = last_ptr_list((struct ptr_list *)sym->stmt->stmts);
207 }
208 if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
209 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) > 10)
210 return 0;
211 if (sym->inline_stmt->type != STMT_COMPOUND)
212 return 0;
213 last_stmt = last_ptr_list((struct ptr_list *)sym->inline_stmt->stmts);
214 }
215
216 if (!last_stmt)
217 return 0;
218
219 /* the magic numbers in this function are pulled out of my bum. */
220 if (last_stmt->pos.line > sym->pos.line + inline_budget)
221 return 0;
222
223 return 1;
224 }
225
226 void __process_post_op_stack(void)
227 {
228 struct expression *expr;
229
230 FOR_EACH_PTR(post_op_stack, expr) {
231 __pass_to_client(expr, OP_HOOK);
232 } END_FOR_EACH_PTR(expr);
233
234 __free_ptr_list((struct ptr_list **)&post_op_stack);
235 }
236
237 static int handle_comma_assigns(struct expression *expr)
238 {
239 struct expression *right;
240 struct expression *assign;
241
242 right = strip_expr(expr->right);
243 if (right->type != EXPR_COMMA)
244 return 0;
245
246 __split_expr(right->left);
247 __process_post_op_stack();
248
249 assign = assign_expression(expr->left, '=', right->right);
250 __split_expr(assign);
251
252 return 1;
253 }
254
255 /* This is to handle *p++ = foo; assignments */
256 static int handle_postop_assigns(struct expression *expr)
257 {
258 struct expression *left, *fake_left;
259 struct expression *assign;
260
261 left = strip_expr(expr->left);
262 if (left->type != EXPR_PREOP || left->op != '*')
263 return 0;
264 left = strip_expr(left->unop);
265 if (left->type != EXPR_POSTOP)
266 return 0;
267
268 fake_left = deref_expression(strip_expr(left->unop));
269 assign = assign_expression(fake_left, '=', expr->right);
270
271 __split_expr(assign);
272 __split_expr(expr->left);
273
274 return 1;
275 }
276
277 static int prev_expression_is_getting_address(struct expression *expr)
278 {
279 struct expression *parent;
280
281 do {
282 parent = expr_get_parent_expr(expr);
283
284 if (!parent)
285 return 0;
286 if (parent->type == EXPR_PREOP && parent->op == '&')
287 return 1;
288 if (parent->type == EXPR_PREOP && parent->op == '(')
289 goto next;
290 if (parent->type == EXPR_DEREF && parent->op == '.')
291 goto next;
292
293 return 0;
294 next:
295 expr = parent;
296 } while (1);
297 }
298
299 static void handle_builtin_overflow_func(struct expression *expr)
300 {
301 struct expression *a, *b, *res, *assign;
302 int op;
303
304 if (sym_name_is("__builtin_add_overflow", expr->fn))
305 op = '+';
306 else if (sym_name_is("__builtin_sub_overflow", expr->fn))
307 op = '-';
308 else if (sym_name_is("__builtin_mul_overflow", expr->fn))
309 op = '*';
310 else
311 return;
312
313 a = get_argument_from_call_expr(expr->args, 0);
314 b = get_argument_from_call_expr(expr->args, 1);
315 res = get_argument_from_call_expr(expr->args, 2);
316
317 assign = assign_expression(deref_expression(res), '=', binop_expression(a, op, b));
318 __split_expr(assign);
319 }
320
321 static int handle__builtin_choose_expr(struct expression *expr)
322 {
323 struct expression *const_expr, *expr1, *expr2;
324 sval_t sval;
325
326 if (!sym_name_is("__builtin_choose_expr", expr->fn))
327 return 0;
328
329 const_expr = get_argument_from_call_expr(expr->args, 0);
330 expr1 = get_argument_from_call_expr(expr->args, 1);
331 expr2 = get_argument_from_call_expr(expr->args, 2);
332
333 if (!get_value(const_expr, &sval) || !expr1 || !expr2)
334 return 0;
335 if (sval.value)
336 __split_expr(expr1);
337 else
338 __split_expr(expr2);
339 return 1;
340 }
341
342 static int handle__builtin_choose_expr_assigns(struct expression *expr)
343 {
344 struct expression *const_expr, *right, *expr1, *expr2, *fake;
345 sval_t sval;
346
347 right = strip_expr(expr->right);
348 if (right->type != EXPR_CALL)
349 return 0;
350 if (!sym_name_is("__builtin_choose_expr", right->fn))
351 return 0;
352
353 const_expr = get_argument_from_call_expr(right->args, 0);
354 expr1 = get_argument_from_call_expr(right->args, 1);
355 expr2 = get_argument_from_call_expr(right->args, 2);
356
357 if (!get_value(const_expr, &sval) || !expr1 || !expr2)
358 return 0;
359
360 fake = assign_expression(expr->left, '=', sval.value ? expr1 : expr2);
361 __split_expr(fake);
362 return 1;
363 }
364
365 void __split_expr(struct expression *expr)
366 {
367 if (!expr)
368 return;
369
370 // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
371
372 if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
373 return;
374 if (__in_fake_assign >= 4) /* don't allow too much nesting */
375 return;
376
377 push_expression(&big_expression_stack, expr);
378 set_position(expr->pos);
379 __pass_to_client(expr, EXPR_HOOK);
380
381 switch (expr->type) {
382 case EXPR_PREOP:
383 expr_set_parent_expr(expr->unop, expr);
384
385 if (expr->op == '*' &&
386 !prev_expression_is_getting_address(expr))
387 __pass_to_client(expr, DEREF_HOOK);
388 __split_expr(expr->unop);
389 __pass_to_client(expr, OP_HOOK);
390 break;
391 case EXPR_POSTOP:
392 expr_set_parent_expr(expr->unop, expr);
393
394 __split_expr(expr->unop);
395 push_expression(&post_op_stack, expr);
396 break;
397 case EXPR_STATEMENT:
398 __expr_stmt_count++;
399 if (expr->statement && !expr->statement) {
400 stmt_set_parent_stmt(expr->statement,
401 last_ptr_list((struct ptr_list *)big_statement_stack));
402 }
403 __split_stmt(expr->statement);
404 __expr_stmt_count--;
405 break;
406 case EXPR_LOGICAL:
407 case EXPR_COMPARE:
408 expr_set_parent_expr(expr->left, expr);
409 expr_set_parent_expr(expr->right, expr);
410
411 __pass_to_client(expr, LOGIC_HOOK);
412 __handle_logic(expr);
413 break;
414 case EXPR_BINOP:
415 expr_set_parent_expr(expr->left, expr);
416 expr_set_parent_expr(expr->right, expr);
417
418 __pass_to_client(expr, BINOP_HOOK);
419 case EXPR_COMMA:
420 expr_set_parent_expr(expr->left, expr);
421 expr_set_parent_expr(expr->right, expr);
422
423 __split_expr(expr->left);
424 __process_post_op_stack();
425 __split_expr(expr->right);
426 break;
427 case EXPR_ASSIGNMENT: {
428 struct expression *right;
429
430 expr_set_parent_expr(expr->left, expr);
431 expr_set_parent_expr(expr->right, expr);
432
433 right = strip_expr(expr->right);
434 if (!right)
435 break;
436
437 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
438
439 /* foo = !bar() */
440 if (__handle_condition_assigns(expr))
441 goto after_assign;
442 /* foo = (x < 5 ? foo : 5); */
443 if (__handle_select_assigns(expr))
444 goto after_assign;
445 /* foo = ({frob(); frob(); frob(); 1;}) */
446 if (__handle_expr_statement_assigns(expr))
447 break; // FIXME: got after
448 /* foo = (3, 4); */
449 if (handle_comma_assigns(expr))
450 goto after_assign;
451 if (handle__builtin_choose_expr_assigns(expr))
452 goto after_assign;
453 if (handle_postop_assigns(expr))
454 break; /* no need to goto after_assign */
455
456 __split_expr(expr->right);
457 if (outside_of_function())
458 __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
459 else
460 __pass_to_client(expr, ASSIGNMENT_HOOK);
461
462 __fake_struct_member_assignments(expr);
463
464 /* Re-examine ->right for inlines. See the commit message */
465 right = strip_expr(expr->right);
466 if (expr->op == '=' && right->type == EXPR_CALL)
467 __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
468
469 if (get_macro_name(right->pos) &&
470 get_macro_name(expr->pos) != get_macro_name(right->pos))
471 __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
472
473 after_assign:
474 __pass_to_client(expr, ASSIGNMENT_HOOK_AFTER);
475 __split_expr(expr->left);
476 break;
477 }
478 case EXPR_DEREF:
479 expr_set_parent_expr(expr->deref, expr);
480
481 __pass_to_client(expr, DEREF_HOOK);
482 __split_expr(expr->deref);
483 break;
484 case EXPR_SLICE:
485 expr_set_parent_expr(expr->base, expr);
486
487 __split_expr(expr->base);
488 break;
489 case EXPR_CAST:
490 case EXPR_FORCE_CAST:
491 expr_set_parent_expr(expr->cast_expression, expr);
492
493 __pass_to_client(expr, CAST_HOOK);
494 __split_expr(expr->cast_expression);
495 break;
496 case EXPR_SIZEOF:
497 if (expr->cast_expression)
498 __pass_to_client(strip_parens(expr->cast_expression),
499 SIZEOF_HOOK);
500 break;
501 case EXPR_OFFSETOF:
502 case EXPR_ALIGNOF:
503 break;
504 case EXPR_CONDITIONAL:
505 case EXPR_SELECT:
506 expr_set_parent_expr(expr->conditional, expr);
507 expr_set_parent_expr(expr->cond_true, expr);
508 expr_set_parent_expr(expr->cond_false, expr);
509
510 if (known_condition_true(expr->conditional)) {
511 __split_expr(expr->cond_true);
512 break;
513 }
514 if (known_condition_false(expr->conditional)) {
515 __split_expr(expr->cond_false);
516 break;
517 }
518 __pass_to_client(expr, SELECT_HOOK);
519 __split_whole_condition(expr->conditional);
520 __split_expr(expr->cond_true);
521 __push_true_states();
522 __use_false_states();
523 __split_expr(expr->cond_false);
524 __merge_true_states();
525 break;
526 case EXPR_CALL:
527 expr_set_parent_expr(expr->fn, expr);
528
529 if (sym_name_is("__builtin_constant_p", expr->fn))
530 break;
531 if (handle__builtin_choose_expr(expr))
532 break;
533 __split_expr(expr->fn);
534 split_expr_list(expr->args, expr);
535 if (is_inline_func(expr->fn))
536 add_inline_function(expr->fn->symbol);
537 if (inlinable(expr->fn))
538 __inline_call = 1;
539 __process_post_op_stack();
540 __pass_to_client(expr, FUNCTION_CALL_HOOK_BEFORE);
541 __pass_to_client(expr, FUNCTION_CALL_HOOK);
542 __inline_call = 0;
543 if (inlinable(expr->fn)) {
544 parse_inline(expr);
545 }
546 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
547 if (is_noreturn_func(expr->fn))
548 nullify_path();
549 handle_builtin_overflow_func(expr);
550 break;
551 case EXPR_INITIALIZER:
552 split_expr_list(expr->expr_list, expr);
553 break;
554 case EXPR_IDENTIFIER:
555 expr_set_parent_expr(expr->ident_expression, expr);
556 __split_expr(expr->ident_expression);
557 break;
558 case EXPR_INDEX:
559 expr_set_parent_expr(expr->idx_expression, expr);
560 __split_expr(expr->idx_expression);
561 break;
562 case EXPR_POS:
563 expr_set_parent_expr(expr->init_expr, expr);
564 __split_expr(expr->init_expr);
565 break;
566 case EXPR_SYMBOL:
567 __pass_to_client(expr, SYM_HOOK);
568 break;
569 case EXPR_STRING:
570 __pass_to_client(expr, STRING_HOOK);
571 break;
572 default:
573 break;
574 };
575 __pass_to_client(expr, EXPR_HOOK_AFTER);
576 pop_expression(&big_expression_stack);
577 }
578
579 static int is_forever_loop(struct statement *stmt)
580 {
581 struct expression *expr;
582 sval_t sval;
583
584 expr = strip_expr(stmt->iterator_pre_condition);
585 if (!expr)
586 expr = stmt->iterator_post_condition;
587 if (!expr) {
588 /* this is a for(;;) loop... */
589 return 1;
590 }
591
592 if (get_value(expr, &sval) && sval.value != 0)
593 return 1;
594
595 return 0;
596 }
597
598 static int loop_num;
599 static char *get_loop_name(int num)
600 {
601 char buf[256];
602
603 snprintf(buf, 255, "-loop%d", num);
604 buf[255] = '\0';
605 return alloc_sname(buf);
606 }
607
608 /*
609 * Pre Loops are while and for loops.
610 */
611 static void handle_pre_loop(struct statement *stmt)
612 {
613 int once_through; /* we go through the loop at least once */
614 struct sm_state *extra_sm = NULL;
615 int unchanged = 0;
616 char *loop_name;
617 struct stree *stree = NULL;
618 struct sm_state *sm = NULL;
619
620 loop_name = get_loop_name(loop_num);
621 loop_num++;
622
623 __split_stmt(stmt->iterator_pre_statement);
624 __prev_stmt = stmt->iterator_pre_statement;
625
626 once_through = implied_condition_true(stmt->iterator_pre_condition);
627
628 loop_count++;
629 __push_continues();
630 __push_breaks();
631
632 __merge_gotos(loop_name, NULL);
633
634 extra_sm = __extra_handle_canonical_loops(stmt, &stree);
635 __in_pre_condition++;
636 __pass_to_client(stmt, PRELOOP_HOOK);
637 __split_whole_condition(stmt->iterator_pre_condition);
638 __in_pre_condition--;
639 FOR_EACH_SM(stree, sm) {
640 set_state(sm->owner, sm->name, sm->sym, sm->state);
641 } END_FOR_EACH_SM(sm);
642 free_stree(&stree);
643 if (extra_sm)
644 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
645
646 if (option_assume_loops)
647 once_through = 1;
648
649 __split_stmt(stmt->iterator_statement);
650 if (is_forever_loop(stmt)) {
651 __merge_continues();
652 __save_gotos(loop_name, NULL);
653
654 __push_fake_cur_stree();
655 __split_stmt(stmt->iterator_post_statement);
656 stree = __pop_fake_cur_stree();
657
658 __discard_false_states();
659 __use_breaks();
660
661 if (!__path_is_null())
662 __merge_stree_into_cur(stree);
663 free_stree(&stree);
664 } else {
665 __merge_continues();
666 unchanged = __iterator_unchanged(extra_sm);
667 __split_stmt(stmt->iterator_post_statement);
668 __prev_stmt = stmt->iterator_post_statement;
669 __cur_stmt = stmt;
670
671 __save_gotos(loop_name, NULL);
672 __in_pre_condition++;
673 __split_whole_condition(stmt->iterator_pre_condition);
674 __in_pre_condition--;
675 nullify_path();
676 __merge_false_states();
677 if (once_through)
678 __discard_false_states();
679 else
680 __merge_false_states();
681
682 if (extra_sm && unchanged)
683 __extra_pre_loop_hook_after(extra_sm,
684 stmt->iterator_post_statement,
685 stmt->iterator_pre_condition);
686 __merge_breaks();
687 }
688 loop_count--;
689 }
690
691 /*
692 * Post loops are do {} while();
693 */
694 static void handle_post_loop(struct statement *stmt)
695 {
696 char *loop_name;
697
698 loop_name = get_loop_name(loop_num);
699 loop_num++;
700 loop_count++;
701
702 __push_continues();
703 __push_breaks();
704 __merge_gotos(loop_name, NULL);
705 __split_stmt(stmt->iterator_statement);
706 __merge_continues();
707 if (!expr_is_zero(stmt->iterator_post_condition))
708 __save_gotos(loop_name, NULL);
709
710 if (is_forever_loop(stmt)) {
711 __use_breaks();
712 } else {
713 __split_whole_condition(stmt->iterator_post_condition);
714 __use_false_states();
715 __merge_breaks();
716 }
717 loop_count--;
718 }
719
720 static int empty_statement(struct statement *stmt)
721 {
722 if (!stmt)
723 return 0;
724 if (stmt->type == STMT_EXPRESSION && !stmt->expression)
725 return 1;
726 return 0;
727 }
728
729 static int last_stmt_on_same_line(void)
730 {
731 struct statement *stmt;
732 int i = 0;
733
734 FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
735 if (!i++)
736 continue;
737 if (stmt->pos.line == get_lineno())
738 return 1;
739 return 0;
740 } END_FOR_EACH_PTR_REVERSE(stmt);
741 return 0;
742 }
743
744 static void split_asm_constraints(struct expression_list *expr_list)
745 {
746 struct expression *expr;
747 int state = 0;
748
749 FOR_EACH_PTR(expr_list, expr) {
750 switch (state) {
751 case 0: /* identifier */
752 case 1: /* constraint */
753 state++;
754 continue;
755 case 2: /* expression */
756 state = 0;
757 __split_expr(expr);
758 continue;
759 }
760 } END_FOR_EACH_PTR(expr);
761 }
762
763 static int is_case_val(struct statement *stmt, sval_t sval)
764 {
765 sval_t case_sval;
766
767 if (stmt->type != STMT_CASE)
768 return 0;
769 if (!stmt->case_expression) {
770 __set_default();
771 return 1;
772 }
773 if (!get_value(stmt->case_expression, &case_sval))
774 return 0;
775 if (case_sval.value == sval.value)
776 return 1;
777 return 0;
778 }
779
780 static struct range_list *get_case_rl(struct expression *switch_expr,
781 struct expression *case_expr,
782 struct expression *case_to)
783 {
784 sval_t start, end;
785 struct range_list *rl = NULL;
786 struct symbol *switch_type;
787
788 switch_type = get_type(switch_expr);
789 if (get_value(case_to, &end) && get_value(case_expr, &start)) {
790 start = sval_cast(switch_type, start);
791 end = sval_cast(switch_type, end);
792 add_range(&rl, start, end);
793 } else if (get_value(case_expr, &start)) {
794 start = sval_cast(switch_type, start);
795 add_range(&rl, start, start);
796 }
797
798 return rl;
799 }
800
801 static void split_known_switch(struct statement *stmt, sval_t sval)
802 {
803 struct statement *tmp;
804 struct range_list *rl;
805
806 __split_expr(stmt->switch_expression);
807 sval = sval_cast(get_type(stmt->switch_expression), sval);
808
809 push_expression(&switch_expr_stack, stmt->switch_expression);
810 __save_switch_states(top_expression(switch_expr_stack));
811 nullify_path();
812 __push_default();
813 __push_breaks();
814
815 stmt = stmt->switch_statement;
816
817 __push_scope_hooks();
818 FOR_EACH_PTR(stmt->stmts, tmp) {
819 __smatch_lineno = tmp->pos.line;
820 if (is_case_val(tmp, sval)) {
821 rl = alloc_rl(sval, sval);
822 __merge_switches(top_expression(switch_expr_stack), rl);
823 __pass_case_to_client(top_expression(switch_expr_stack), rl);
824 }
825 if (__path_is_null())
826 continue;
827 __split_stmt(tmp);
828 if (__path_is_null()) {
829 __set_default();
830 goto out;
831 }
832 } END_FOR_EACH_PTR(tmp);
833 out:
834 __call_scope_hooks();
835 if (!__pop_default())
836 __merge_switches(top_expression(switch_expr_stack), NULL);
837 __discard_switches();
838 __merge_breaks();
839 pop_expression(&switch_expr_stack);
840 }
841
842 static void split_case(struct statement *stmt)
843 {
844 struct range_list *rl = NULL;
845
846 expr_set_parent_stmt(stmt->case_expression, stmt);
847 expr_set_parent_stmt(stmt->case_to, stmt);
848
849 rl = get_case_rl(top_expression(switch_expr_stack),
850 stmt->case_expression, stmt->case_to);
851 while (stmt->case_statement->type == STMT_CASE) {
852 struct range_list *tmp;
853
854 tmp = get_case_rl(top_expression(switch_expr_stack),
855 stmt->case_statement->case_expression,
856 stmt->case_statement->case_to);
857 if (!tmp)
858 break;
859 rl = rl_union(rl, tmp);
860 if (!stmt->case_expression)
861 __set_default();
862 stmt = stmt->case_statement;
863 }
864
865 __merge_switches(top_expression(switch_expr_stack), rl);
866
867 if (!stmt->case_expression)
868 __set_default();
869 __split_stmt(stmt->case_statement);
870 }
871
872 int time_parsing_function(void)
873 {
874 return ms_since(&fn_start_time) / 1000;
875 }
876
877 bool taking_too_long(void)
878 {
879 if ((ms_since(&outer_fn_start_time) / 1000) > 60 * 5) /* five minutes */
880 return 1;
881 return 0;
882 }
883
884 static int is_last_stmt(struct statement *cur_stmt)
885 {
886 struct symbol *fn;
887 struct statement *stmt;
888
889 if (!cur_func_sym)
890 return 0;
891 fn = get_base_type(cur_func_sym);
892 if (!fn)
893 return 0;
894 stmt = fn->stmt;
895 if (!stmt)
896 stmt = fn->inline_stmt;
897 if (!stmt || stmt->type != STMT_COMPOUND)
898 return 0;
899 stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
900 if (stmt && stmt->type == STMT_LABEL)
901 stmt = stmt->label_statement;
902 if (stmt == cur_stmt)
903 return 1;
904 return 0;
905 }
906
907 static void handle_backward_goto(struct statement *goto_stmt)
908 {
909 const char *goto_name, *label_name;
910 struct statement *func_stmt;
911 struct symbol *base_type = get_base_type(cur_func_sym);
912 struct statement *tmp;
913 int found = 0;
914
915 if (!option_info)
916 return;
917 if (last_goto_statement_handled)
918 return;
919 last_goto_statement_handled = 1;
920
921 if (!goto_stmt->goto_label ||
922 goto_stmt->goto_label->type != SYM_LABEL ||
923 !goto_stmt->goto_label->ident)
924 return;
925 goto_name = goto_stmt->goto_label->ident->name;
926
927 func_stmt = base_type->stmt;
928 if (!func_stmt)
929 func_stmt = base_type->inline_stmt;
930 if (!func_stmt)
931 return;
932 if (func_stmt->type != STMT_COMPOUND)
933 return;
934
935 FOR_EACH_PTR(func_stmt->stmts, tmp) {
936 if (!found) {
937 if (tmp->type != STMT_LABEL)
938 continue;
939 if (!tmp->label_identifier ||
940 tmp->label_identifier->type != SYM_LABEL ||
941 !tmp->label_identifier->ident)
942 continue;
943 label_name = tmp->label_identifier->ident->name;
944 if (strcmp(goto_name, label_name) != 0)
945 continue;
946 found = 1;
947 }
948 __split_stmt(tmp);
949 } END_FOR_EACH_PTR(tmp);
950 }
951
952 static void fake_a_return(void)
953 {
954 struct symbol *return_type;
955
956 nullify_path();
957 __unnullify_path();
958
959 return_type = get_real_base_type(cur_func_sym);
960 return_type = get_real_base_type(return_type);
961 if (return_type != &void_ctype) {
962 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
963 nullify_path();
964 }
965 }
966
967 static void fake_an_empty_default(struct position pos)
968 {
969 static struct statement none = {};
970
971 none.pos = pos;
972 none.type = STMT_NONE;
973 __merge_switches(top_expression(switch_expr_stack), NULL);
974 __split_stmt(&none);
975 }
976
977 static void split_compound(struct statement *stmt)
978 {
979 struct statement *prev = NULL;
980 struct statement *cur = NULL;
981 struct statement *next;
982
983 __push_scope_hooks();
984
985 FOR_EACH_PTR(stmt->stmts, next) {
986 /* just set them all ahead of time */
987 stmt_set_parent_stmt(next, stmt);
988
989 if (cur) {
990 __prev_stmt = prev;
991 __next_stmt = next;
992 __cur_stmt = cur;
993 __split_stmt(cur);
994 }
995 prev = cur;
996 cur = next;
997 } END_FOR_EACH_PTR(next);
998 if (cur) {
999 __prev_stmt = prev;
1000 __cur_stmt = cur;
1001 __next_stmt = NULL;
1002 __split_stmt(cur);
1003 }
1004
1005 /*
1006 * For function scope, then delay calling the scope hooks until the
1007 * end of function hooks can run. I'm not positive this is the right
1008 * thing...
1009 */
1010 if (!is_last_stmt(cur))
1011 __call_scope_hooks();
1012 }
1013
1014 /*
1015 * This is a hack, work around for detecting empty functions.
1016 */
1017 static int need_delayed_scope_hooks(void)
1018 {
1019 struct symbol *fn = get_base_type(cur_func_sym);
1020 struct statement *stmt;
1021
1022 if (!fn)
1023 return 0;
1024 stmt = fn->stmt;
1025 if (!stmt)
1026 stmt = fn->inline_stmt;
1027 if (stmt && stmt->type == STMT_COMPOUND)
1028 return 1;
1029 return 0;
1030 }
1031
1032 void __split_label_stmt(struct statement *stmt)
1033 {
1034 if (stmt->label_identifier &&
1035 stmt->label_identifier->type == SYM_LABEL &&
1036 stmt->label_identifier->ident) {
1037 loop_count |= 0x0800000;
1038 __merge_gotos(stmt->label_identifier->ident->name, stmt->label_identifier);
1039 }
1040 }
1041
1042 static void find_asm_gotos(struct statement *stmt)
1043 {
1044 struct symbol *sym;
1045
1046 FOR_EACH_PTR(stmt->asm_labels, sym) {
1047 __save_gotos(sym->ident->name, sym);
1048 } END_FOR_EACH_PTR(sym);
1049 }
1050
1051 void __split_stmt(struct statement *stmt)
1052 {
1053 sval_t sval;
1054
1055 if (!stmt)
1056 goto out;
1057
1058 if (!__in_fake_assign)
1059 __silence_warnings_for_stmt = false;
1060
1061 if (__bail_on_rest_of_function || is_skipped_function())
1062 return;
1063
1064 if (out_of_memory() || taking_too_long()) {
1065 struct timeval stop;
1066
1067 gettimeofday(&stop, NULL);
1068
1069 __bail_on_rest_of_function = 1;
1070 final_pass = 1;
1071 sm_perror("Function too hairy. Giving up. %lu seconds",
1072 stop.tv_sec - fn_start_time.tv_sec);
1073 fake_a_return();
1074 final_pass = 0; /* turn off sm_msg() from here */
1075 return;
1076 }
1077
1078 add_ptr_list(&big_statement_stack, stmt);
1079 free_expression_stack(&big_expression_stack);
1080 set_position(stmt->pos);
1081 __pass_to_client(stmt, STMT_HOOK);
1082
1083 switch (stmt->type) {
1084 case STMT_DECLARATION:
1085 split_declaration(stmt->declaration);
1086 break;
1087 case STMT_RETURN:
1088 expr_set_parent_stmt(stmt->ret_value, stmt);
1089
1090 __split_expr(stmt->ret_value);
1091 __pass_to_client(stmt->ret_value, RETURN_HOOK);
1092 __process_post_op_stack();
1093 nullify_path();
1094 break;
1095 case STMT_EXPRESSION:
1096 expr_set_parent_stmt(stmt->expression, stmt);
1097 expr_set_parent_stmt(stmt->context, stmt);
1098
1099 __split_expr(stmt->expression);
1100 break;
1101 case STMT_COMPOUND:
1102 split_compound(stmt);
1103 break;
1104 case STMT_IF:
1105 stmt_set_parent_stmt(stmt->if_true, stmt);
1106 stmt_set_parent_stmt(stmt->if_false, stmt);
1107 expr_set_parent_stmt(stmt->if_conditional, stmt);
1108
1109 if (known_condition_true(stmt->if_conditional)) {
1110 __split_stmt(stmt->if_true);
1111 break;
1112 }
1113 if (known_condition_false(stmt->if_conditional)) {
1114 __split_stmt(stmt->if_false);
1115 break;
1116 }
1117 __split_whole_condition(stmt->if_conditional);
1118 __split_stmt(stmt->if_true);
1119 if (empty_statement(stmt->if_true) &&
1120 last_stmt_on_same_line() &&
1121 !get_macro_name(stmt->if_true->pos))
1122 sm_warning("if();");
1123 __push_true_states();
1124 __use_false_states();
1125 __split_stmt(stmt->if_false);
1126 __merge_true_states();
1127 break;
1128 case STMT_ITERATOR:
1129 stmt_set_parent_stmt(stmt->iterator_pre_statement, stmt);
1130 stmt_set_parent_stmt(stmt->iterator_statement, stmt);
1131 stmt_set_parent_stmt(stmt->iterator_post_statement, stmt);
1132 expr_set_parent_stmt(stmt->iterator_pre_condition, stmt);
1133 expr_set_parent_stmt(stmt->iterator_post_condition, stmt);
1134
1135 if (stmt->iterator_pre_condition)
1136 handle_pre_loop(stmt);
1137 else if (stmt->iterator_post_condition)
1138 handle_post_loop(stmt);
1139 else {
1140 // these are for(;;) type loops.
1141 handle_pre_loop(stmt);
1142 }
1143 break;
1144 case STMT_SWITCH:
1145 stmt_set_parent_stmt(stmt->switch_statement, stmt);
1146 expr_set_parent_stmt(stmt->switch_expression, stmt);
1147
1148 if (get_value(stmt->switch_expression, &sval)) {
1149 split_known_switch(stmt, sval);
1150 break;
1151 }
1152 __split_expr(stmt->switch_expression);
1153 push_expression(&switch_expr_stack, stmt->switch_expression);
1154 __save_switch_states(top_expression(switch_expr_stack));
1155 nullify_path();
1156 __push_default();
1157 __push_breaks();
1158 __split_stmt(stmt->switch_statement);
1159 if (!__pop_default() && have_remaining_cases())
1160 fake_an_empty_default(stmt->pos);
1161 __discard_switches();
1162 __merge_breaks();
1163 pop_expression(&switch_expr_stack);
1164 break;
1165 case STMT_CASE:
1166 split_case(stmt);
1167 break;
1168 case STMT_LABEL:
1169 __split_label_stmt(stmt);
1170 __split_stmt(stmt->label_statement);
1171 break;
1172 case STMT_GOTO:
1173 expr_set_parent_stmt(stmt->goto_expression, stmt);
1174
1175 __split_expr(stmt->goto_expression);
1176 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1177 if (!strcmp(stmt->goto_label->ident->name, "break")) {
1178 __process_breaks();
1179 } else if (!strcmp(stmt->goto_label->ident->name,
1180 "continue")) {
1181 __process_continues();
1182 }
1183 } else if (stmt->goto_label &&
1184 stmt->goto_label->type == SYM_LABEL &&
1185 stmt->goto_label->ident) {
1186 __save_gotos(stmt->goto_label->ident->name, stmt->goto_label);
1187 }
1188 nullify_path();
1189 if (is_last_stmt(stmt))
1190 handle_backward_goto(stmt);
1191 break;
1192 case STMT_NONE:
1193 break;
1194 case STMT_ASM:
1195 expr_set_parent_stmt(stmt->asm_string, stmt);
1196
1197 find_asm_gotos(stmt);
1198 __pass_to_client(stmt, ASM_HOOK);
1199 __split_expr(stmt->asm_string);
1200 split_asm_constraints(stmt->asm_outputs);
1201 split_asm_constraints(stmt->asm_inputs);
1202 split_asm_constraints(stmt->asm_clobbers);
1203 break;
1204 case STMT_CONTEXT:
1205 break;
1206 case STMT_RANGE:
1207 __split_expr(stmt->range_expression);
1208 __split_expr(stmt->range_low);
1209 __split_expr(stmt->range_high);
1210 break;
1211 }
1212 __pass_to_client(stmt, STMT_HOOK_AFTER);
1213 out:
1214 __process_post_op_stack();
1215 }
1216
1217 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1218 {
1219 struct expression *expr;
1220
1221 FOR_EACH_PTR(expr_list, expr) {
1222 expr_set_parent_expr(expr, parent);
1223 __split_expr(expr);
1224 __process_post_op_stack();
1225 } END_FOR_EACH_PTR(expr);
1226 }
1227
1228 static void split_sym(struct symbol *sym)
1229 {
1230 if (!sym)
1231 return;
1232 if (!(sym->namespace & NS_SYMBOL))
1233 return;
1234
1235 __split_stmt(sym->stmt);
1236 __split_expr(sym->array_size);
1237 split_symlist(sym->arguments);
1238 split_symlist(sym->symbol_list);
1239 __split_stmt(sym->inline_stmt);
1240 split_symlist(sym->inline_symbol_list);
1241 }
1242
1243 static void split_symlist(struct symbol_list *sym_list)
1244 {
1245 struct symbol *sym;
1246
1247 FOR_EACH_PTR(sym_list, sym) {
1248 split_sym(sym);
1249 } END_FOR_EACH_PTR(sym);
1250 }
1251
1252 typedef void (fake_cb)(struct expression *expr);
1253
1254 static int member_to_number(struct expression *expr, struct ident *member)
1255 {
1256 struct symbol *type, *tmp;
1257 char *name;
1258 int i;
1259
1260 if (!member)
1261 return -1;
1262 name = member->name;
1263
1264 type = get_type(expr);
1265 if (!type || type->type != SYM_STRUCT)
1266 return -1;
1267
1268 i = -1;
1269 FOR_EACH_PTR(type->symbol_list, tmp) {
1270 i++;
1271 if (!tmp->ident)
1272 continue;
1273 if (strcmp(name, tmp->ident->name) == 0)
1274 return i;
1275 } END_FOR_EACH_PTR(tmp);
1276 return -1;
1277 }
1278
1279 static struct ident *number_to_member(struct expression *expr, int num)
1280 {
1281 struct symbol *type, *member;
1282 int i = 0;
1283
1284 type = get_type(expr);
1285 if (!type || type->type != SYM_STRUCT)
1286 return NULL;
1287
1288 FOR_EACH_PTR(type->symbol_list, member) {
1289 if (i == num)
1290 return member->ident;
1291 i++;
1292 } END_FOR_EACH_PTR(member);
1293 return NULL;
1294 }
1295
1296 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1297
1298 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1299 {
1300 struct expression *edge_member, *assign;
1301 struct symbol *base = get_real_base_type(member);
1302 struct symbol *tmp;
1303
1304 if (member->ident)
1305 expr = member_expression(expr, '.', member->ident);
1306
1307 FOR_EACH_PTR(base->symbol_list, tmp) {
1308 struct symbol *type;
1309
1310 type = get_real_base_type(tmp);
1311 if (!type)
1312 continue;
1313
1314 edge_member = member_expression(expr, '.', tmp->ident);
1315 if (get_extra_state(edge_member))
1316 continue;
1317
1318 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1319 set_inner_struct_members(expr, tmp);
1320 continue;
1321 }
1322
1323 if (!tmp->ident)
1324 continue;
1325
1326 assign = assign_expression(edge_member, '=', zero_expr());
1327 __split_expr(assign);
1328 } END_FOR_EACH_PTR(tmp);
1329
1330
1331 }
1332
1333 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1334 {
1335 struct symbol *tmp;
1336 struct expression *member = NULL;
1337 struct expression *assign;
1338 int op = '*';
1339
1340 if (expr->type == EXPR_PREOP && expr->op == '&') {
1341 expr = strip_expr(expr->unop);
1342 op = '.';
1343 }
1344
1345 FOR_EACH_PTR(type->symbol_list, tmp) {
1346 type = get_real_base_type(tmp);
1347 if (!type)
1348 continue;
1349
1350 if (tmp->ident) {
1351 member = member_expression(expr, op, tmp->ident);
1352 if (get_extra_state(member))
1353 continue;
1354 }
1355
1356 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1357 set_inner_struct_members(expr, tmp);
1358 continue;
1359 }
1360 if (type->type == SYM_ARRAY)
1361 continue;
1362 if (!tmp->ident)
1363 continue;
1364
1365 assign = assign_expression(member, '=', zero_expr());
1366 __split_expr(assign);
1367 } END_FOR_EACH_PTR(tmp);
1368 }
1369
1370 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1371 {
1372 struct expression *deref, *assign, *tmp, *right;
1373 struct symbol *struct_type, *type;
1374 struct ident *member;
1375 int member_idx;
1376
1377 struct_type = get_type(symbol);
1378 if (!struct_type ||
1379 (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1380 return;
1381
1382 /*
1383 * We're parsing an initializer that could look something like this:
1384 * struct foo foo = {
1385 * 42,
1386 * .whatever.xxx = 11,
1387 * .zzz = 12,
1388 * };
1389 *
1390 * So what we have here is a list with 42, .whatever, and .zzz. We need
1391 * to break it up into left and right sides of the assignments.
1392 *
1393 */
1394 member_idx = 0;
1395 FOR_EACH_PTR(members, tmp) {
1396 deref = NULL;
1397 if (tmp->type == EXPR_IDENTIFIER) {
1398 member_idx = member_to_number(symbol, tmp->expr_ident);
1399 while (tmp->type == EXPR_IDENTIFIER) {
1400 member = tmp->expr_ident;
1401 tmp = tmp->ident_expression;
1402 if (deref)
1403 deref = member_expression(deref, '.', member);
1404 else
1405 deref = member_expression(symbol, '.', member);
1406 }
1407 } else {
1408 member = number_to_member(symbol, member_idx);
1409 deref = member_expression(symbol, '.', member);
1410 }
1411 right = tmp;
1412 member_idx++;
1413 if (right->type == EXPR_INITIALIZER) {
1414 type = get_type(deref);
1415 if (type && type->type == SYM_ARRAY)
1416 fake_element_assigns_helper(deref, right->expr_list, fake_cb);
1417 else
1418 fake_member_assigns_helper(deref, right->expr_list, fake_cb);
1419 } else {
1420 assign = assign_expression(deref, '=', right);
1421 fake_cb(assign);
1422 }
1423 } END_FOR_EACH_PTR(tmp);
1424
1425 set_unset_to_zero(struct_type, symbol);
1426 }
1427
1428 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1429 {
1430 fake_member_assigns_helper(symbol_expression(sym),
1431 sym->initializer->expr_list, fake_cb);
1432 }
1433
1434 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1435 {
1436 struct expression *offset, *binop, *assign, *tmp;
1437 struct symbol *type;
1438 int idx;
1439
1440 if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1441 return;
1442
1443 idx = 0;
1444 FOR_EACH_PTR(expr_list, tmp) {
1445 if (tmp->type == EXPR_INDEX) {
1446 if (tmp->idx_from != tmp->idx_to)
1447 return;
1448 idx = tmp->idx_from;
1449 if (!tmp->idx_expression)
1450 goto next;
1451 tmp = tmp->idx_expression;
1452 }
1453 offset = value_expr(idx);
1454 binop = array_element_expression(array, offset);
1455 if (tmp->type == EXPR_INITIALIZER) {
1456 type = get_type(binop);
1457 if (type && type->type == SYM_ARRAY)
1458 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1459 else
1460 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1461 } else {
1462 assign = assign_expression(binop, '=', tmp);
1463 fake_cb(assign);
1464 }
1465 next:
1466 idx++;
1467 } END_FOR_EACH_PTR(tmp);
1468 }
1469
1470 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1471 {
1472 fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1473 }
1474
1475 static void fake_assign_expr(struct symbol *sym)
1476 {
1477 struct expression *assign, *symbol;
1478
1479 symbol = symbol_expression(sym);
1480 assign = assign_expression(symbol, '=', sym->initializer);
1481 __split_expr(assign);
1482 }
1483
1484 static void do_initializer_stuff(struct symbol *sym)
1485 {
1486 if (!sym->initializer)
1487 return;
1488
1489 if (sym->initializer->type == EXPR_INITIALIZER) {
1490 if (get_real_base_type(sym)->type == SYM_ARRAY)
1491 fake_element_assigns(sym, __split_expr);
1492 else
1493 fake_member_assigns(sym, __split_expr);
1494 } else {
1495 fake_assign_expr(sym);
1496 }
1497 }
1498
1499 static void split_declaration(struct symbol_list *sym_list)
1500 {
1501 struct symbol *sym;
1502
1503 FOR_EACH_PTR(sym_list, sym) {
1504 __pass_to_client(sym, DECLARATION_HOOK);
1505 do_initializer_stuff(sym);
1506 split_sym(sym);
1507 } END_FOR_EACH_PTR(sym);
1508 }
1509
1510 static void call_global_assign_hooks(struct expression *assign)
1511 {
1512 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1513 }
1514
1515 static void fake_global_assign(struct symbol *sym)
1516 {
1517 struct expression *assign, *symbol;
1518
1519 if (get_real_base_type(sym)->type == SYM_ARRAY) {
1520 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1521 fake_element_assigns(sym, call_global_assign_hooks);
1522 } else if (sym->initializer) {
1523 symbol = symbol_expression(sym);
1524 assign = assign_expression(symbol, '=', sym->initializer);
1525 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1526 } else {
1527 fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1528 }
1529 } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1530 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1531 fake_member_assigns(sym, call_global_assign_hooks);
1532 } else if (sym->initializer) {
1533 symbol = symbol_expression(sym);
1534 assign = assign_expression(symbol, '=', sym->initializer);
1535 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1536 } else {
1537 fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1538 }
1539 } else {
1540 symbol = symbol_expression(sym);
1541 if (sym->initializer) {
1542 assign = assign_expression(symbol, '=', sym->initializer);
1543 __split_expr(assign);
1544 } else {
1545 assign = assign_expression(symbol, '=', zero_expr());
1546 }
1547 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1548 }
1549 }
1550
1551 static void start_function_definition(struct symbol *sym)
1552 {
1553 __in_function_def = 1;
1554 __pass_to_client(sym, FUNC_DEF_HOOK);
1555 __in_function_def = 0;
1556 __pass_to_client(sym, AFTER_DEF_HOOK);
1557
1558 }
1559
1560 static void split_function(struct symbol *sym)
1561 {
1562 struct symbol *base_type = get_base_type(sym);
1563 struct timeval stop;
1564
1565 if (!base_type->stmt && !base_type->inline_stmt)
1566 return;
1567
1568 gettimeofday(&outer_fn_start_time, NULL);
1569 gettimeofday(&fn_start_time, NULL);
1570 cur_func_sym = sym;
1571 if (sym->ident)
1572 cur_func = sym->ident->name;
1573 set_position(sym->pos);
1574 loop_count = 0;
1575 last_goto_statement_handled = 0;
1576 sm_debug("new function: %s\n", cur_func);
1577 __stree_id = 0;
1578 if (option_two_passes) {
1579 __unnullify_path();
1580 loop_num = 0;
1581 final_pass = 0;
1582 start_function_definition(sym);
1583 __split_stmt(base_type->stmt);
1584 __split_stmt(base_type->inline_stmt);
1585 nullify_path();
1586 }
1587 __unnullify_path();
1588 loop_num = 0;
1589 final_pass = 1;
1590 start_function_definition(sym);
1591 __split_stmt(base_type->stmt);
1592 __split_stmt(base_type->inline_stmt);
1593 __pass_to_client(sym, END_FUNC_HOOK);
1594 if (need_delayed_scope_hooks())
1595 __call_scope_hooks();
1596 __pass_to_client(sym, AFTER_FUNC_HOOK);
1597
1598 clear_all_states();
1599
1600 gettimeofday(&stop, NULL);
1601 if (option_time && stop.tv_sec - fn_start_time.tv_sec > 2) {
1602 final_pass++;
1603 sm_msg("func_time: %lu", stop.tv_sec - fn_start_time.tv_sec);
1604 final_pass--;
1605 }
1606 cur_func_sym = NULL;
1607 cur_func = NULL;
1608 free_data_info_allocs();
1609 free_expression_stack(&switch_expr_stack);
1610 __free_ptr_list((struct ptr_list **)&big_statement_stack);
1611 __bail_on_rest_of_function = 0;
1612 }
1613
1614 static void save_flow_state(void)
1615 {
1616 __add_ptr_list(&backup, INT_PTR(loop_num << 2));
1617 __add_ptr_list(&backup, INT_PTR(loop_count << 2));
1618 __add_ptr_list(&backup, INT_PTR(final_pass << 2));
1619
1620 __add_ptr_list(&backup, big_statement_stack);
1621 __add_ptr_list(&backup, big_expression_stack);
1622 __add_ptr_list(&backup, big_condition_stack);
1623 __add_ptr_list(&backup, switch_expr_stack);
1624
1625 __add_ptr_list(&backup, cur_func_sym);
1626
1627 __add_ptr_list(&backup, __prev_stmt);
1628 __add_ptr_list(&backup, __cur_stmt);
1629 __add_ptr_list(&backup, __next_stmt);
1630 }
1631
1632 static void *pop_backup(void)
1633 {
1634 void *ret;
1635
1636 ret = last_ptr_list(backup);
1637 delete_ptr_list_last(&backup);
1638 return ret;
1639 }
1640
1641 static void restore_flow_state(void)
1642 {
1643 __next_stmt = pop_backup();
1644 __cur_stmt = pop_backup();
1645 __prev_stmt = pop_backup();
1646
1647 cur_func_sym = pop_backup();
1648 switch_expr_stack = pop_backup();
1649 big_condition_stack = pop_backup();
1650 big_expression_stack = pop_backup();
1651 big_statement_stack = pop_backup();
1652 final_pass = PTR_INT(pop_backup()) >> 2;
1653 loop_count = PTR_INT(pop_backup()) >> 2;
1654 loop_num = PTR_INT(pop_backup()) >> 2;
1655 }
1656
1657 static void parse_inline(struct expression *call)
1658 {
1659 struct symbol *base_type;
1660 char *cur_func_bak = cur_func; /* not aligned correctly for backup */
1661 struct timeval time_backup = fn_start_time;
1662 struct expression *orig_inline = __inline_fn;
1663 int orig_budget;
1664
1665 if (out_of_memory() || taking_too_long())
1666 return;
1667
1668 save_flow_state();
1669
1670 __pass_to_client(call, INLINE_FN_START);
1671 final_pass = 0; /* don't print anything */
1672 __inline_fn = call;
1673 orig_budget = inline_budget;
1674 inline_budget = inline_budget - 5;
1675
1676 base_type = get_base_type(call->fn->symbol);
1677 cur_func_sym = call->fn->symbol;
1678 if (call->fn->symbol->ident)
1679 cur_func = call->fn->symbol->ident->name;
1680 else
1681 cur_func = NULL;
1682 set_position(call->fn->symbol->pos);
1683
1684 save_all_states();
1685 big_statement_stack = NULL;
1686 big_expression_stack = NULL;
1687 big_condition_stack = NULL;
1688 switch_expr_stack = NULL;
1689
1690 sm_debug("inline function: %s\n", cur_func);
1691 __unnullify_path();
1692 loop_num = 0;
1693 loop_count = 0;
1694 start_function_definition(call->fn->symbol);
1695 __split_stmt(base_type->stmt);
1696 __split_stmt(base_type->inline_stmt);
1697 __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1698 __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1699
1700 free_expression_stack(&switch_expr_stack);
1701 __free_ptr_list((struct ptr_list **)&big_statement_stack);
1702 nullify_path();
1703 free_goto_stack();
1704
1705 restore_flow_state();
1706 fn_start_time = time_backup;
1707 cur_func = cur_func_bak;
1708
1709 restore_all_states();
1710 set_position(call->pos);
1711 __inline_fn = orig_inline;
1712 inline_budget = orig_budget;
1713 __pass_to_client(call, INLINE_FN_END);
1714 }
1715
1716 static struct symbol_list *inlines_called;
1717 static void add_inline_function(struct symbol *sym)
1718 {
1719 static struct symbol_list *already_added;
1720 struct symbol *tmp;
1721
1722 FOR_EACH_PTR(already_added, tmp) {
1723 if (tmp == sym)
1724 return;
1725 } END_FOR_EACH_PTR(tmp);
1726
1727 add_ptr_list(&already_added, sym);
1728 add_ptr_list(&inlines_called, sym);
1729 }
1730
1731 static void process_inlines(void)
1732 {
1733 struct symbol *tmp;
1734
1735 FOR_EACH_PTR(inlines_called, tmp) {
1736 split_function(tmp);
1737 } END_FOR_EACH_PTR(tmp);
1738 free_ptr_list(&inlines_called);
1739 }
1740
1741 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1742 {
1743 struct symbol *sym;
1744
1745 FOR_EACH_PTR_REVERSE(big_list, sym) {
1746 if (!sym->scope)
1747 continue;
1748 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1749 return sym;
1750 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1751 return sym;
1752 } END_FOR_EACH_PTR_REVERSE(sym);
1753
1754 return NULL;
1755 }
1756
1757 static bool interesting_function(struct symbol *sym)
1758 {
1759 static int prev_stream = -1;
1760 static bool prev_answer;
1761 const char *filename;
1762 int len;
1763
1764 if (!(sym->ctype.modifiers & MOD_INLINE))
1765 return true;
1766
1767 if (sym->pos.stream == prev_stream)
1768 return prev_answer;
1769
1770 prev_stream = sym->pos.stream;
1771 prev_answer = false;
1772
1773 filename = stream_name(sym->pos.stream);
1774 len = strlen(filename);
1775 if (len > 0 && filename[len - 1] == 'c')
1776 prev_answer = true;
1777 return prev_answer;
1778 }
1779
1780 static void split_inlines_in_scope(struct symbol *sym)
1781 {
1782 struct symbol *base;
1783 struct symbol_list *scope_list;
1784 int stream;
1785
1786 scope_list = sym->scope->symbols;
1787 stream = sym->pos.stream;
1788
1789 /* find the last static symbol in the file */
1790 FOR_EACH_PTR_REVERSE(scope_list, sym) {
1791 if (sym->pos.stream != stream)
1792 continue;
1793 if (sym->type != SYM_NODE)
1794 continue;
1795 base = get_base_type(sym);
1796 if (!base)
1797 continue;
1798 if (base->type != SYM_FN)
1799 continue;
1800 if (!base->inline_stmt)
1801 continue;
1802 if (!interesting_function(sym))
1803 continue;
1804 add_inline_function(sym);
1805 } END_FOR_EACH_PTR_REVERSE(sym);
1806
1807 process_inlines();
1808 }
1809
1810 static void split_inlines(struct symbol_list *sym_list)
1811 {
1812 struct symbol *sym;
1813
1814 sym = get_last_scoped_symbol(sym_list, 0);
1815 if (sym)
1816 split_inlines_in_scope(sym);
1817 sym = get_last_scoped_symbol(sym_list, 1);
1818 if (sym)
1819 split_inlines_in_scope(sym);
1820 }
1821
1822 static struct stree *clone_estates_perm(struct stree *orig)
1823 {
1824 struct stree *ret = NULL;
1825 struct sm_state *tmp;
1826
1827 FOR_EACH_SM(orig, tmp) {
1828 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1829 } END_FOR_EACH_SM(tmp);
1830
1831 return ret;
1832 }
1833
1834 struct position last_pos;
1835 static void split_c_file_functions(struct symbol_list *sym_list)
1836 {
1837 struct symbol *sym;
1838
1839 __unnullify_path();
1840 FOR_EACH_PTR(sym_list, sym) {
1841 set_position(sym->pos);
1842 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1843 __pass_to_client(sym, BASE_HOOK);
1844 fake_global_assign(sym);
1845 }
1846 } END_FOR_EACH_PTR(sym);
1847 global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1848 nullify_path();
1849
1850 FOR_EACH_PTR(sym_list, sym) {
1851 set_position(sym->pos);
1852 last_pos = sym->pos;
1853 if (!interesting_function(sym))
1854 continue;
1855 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1856 split_function(sym);
1857 process_inlines();
1858 }
1859 last_pos = sym->pos;
1860 } END_FOR_EACH_PTR(sym);
1861 split_inlines(sym_list);
1862 __pass_to_client(sym_list, END_FILE_HOOK);
1863 }
1864
1865 static int final_before_fake;
1866 void init_fake_env(void)
1867 {
1868 if (!in_fake_env)
1869 final_before_fake = final_pass;
1870 in_fake_env++;
1871 __push_fake_cur_stree();
1872 final_pass = 0;
1873 }
1874
1875 void end_fake_env(void)
1876 {
1877 __pop_fake_cur_stree();
1878 in_fake_env--;
1879 if (!in_fake_env)
1880 final_pass = final_before_fake;
1881 }
1882
1883 static void open_output_files(char *base_file)
1884 {
1885 char buf[256];
1886
1887 snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1888 sm_outfd = fopen(buf, "w");
1889 if (!sm_outfd)
1890 sm_fatal("Cannot open %s", buf);
1891
1892 if (!option_info)
1893 return;
1894
1895 snprintf(buf, sizeof(buf), "%s.smatch.sql", base_file);
1896 sql_outfd = fopen(buf, "w");
1897 if (!sql_outfd)
1898 sm_fatal("Error: Cannot open %s", buf);
1899
1900 snprintf(buf, sizeof(buf), "%s.smatch.caller_info", base_file);
1901 caller_info_fd = fopen(buf, "w");
1902 if (!caller_info_fd)
1903 sm_fatal("Error: Cannot open %s", buf);
1904 }
1905
1906 void smatch(struct string_list *filelist)
1907 {
1908 struct symbol_list *sym_list;
1909 struct timeval stop, start;
1910 char *path;
1911 int len;
1912
1913 gettimeofday(&start, NULL);
1914
1915 FOR_EACH_PTR_NOTAG(filelist, base_file) {
1916 path = getcwd(NULL, 0);
1917 free(full_base_file);
1918 if (path) {
1919 len = strlen(path) + 1 + strlen(base_file) + 1;
1920 full_base_file = malloc(len);
1921 snprintf(full_base_file, len, "%s/%s", path, base_file);
1922 } else {
1923 full_base_file = alloc_string(base_file);
1924 }
1925 if (option_file_output)
1926 open_output_files(base_file);
1927 sym_list = sparse_keep_tokens(base_file);
1928 split_c_file_functions(sym_list);
1929 } END_FOR_EACH_PTR_NOTAG(base_file);
1930
1931 gettimeofday(&stop, NULL);
1932
1933 set_position(last_pos);
1934 final_pass = 1;
1935 if (option_time)
1936 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1937 if (option_mem)
1938 sm_msg("mem: %luKb", get_max_memory());
1939 }
Static analysis for C