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c_typecheck_code.cpp
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1/*******************************************************************\
2
3Module: C Language Type Checking
4
5Author: Daniel Kroening, kroening@kroening.com
6
7\*******************************************************************/
8
11
12#include "c_typecheck_base.h"
13
14#include <util/arith_tools.h>
15#include <util/c_types.h>
16#include <util/config.h>
17#include <util/expr_util.h>
18#include <util/range.h>
20
21#include "ansi_c_declaration.h"
22#include "c_expr.h"
23
25{
27}
28
30{
31 if(code.id()!=ID_code)
32 {
34 error() << "expected code, got " << code.pretty() << eom;
35 throw 0;
36 }
37
38 code.type() = empty_typet();
39
40 const irep_idt &statement=code.get_statement();
41
42 if(statement==ID_expression)
44 else if(statement==ID_label)
46 else if(statement==ID_switch_case)
48 else if(statement==ID_gcc_switch_case_range)
50 else if(statement==ID_block)
52 else if(statement==ID_decl_block)
53 {
54 }
55 else if(statement==ID_ifthenelse)
57 else if(statement==ID_while)
59 else if(statement==ID_dowhile)
61 else if(statement==ID_for)
62 typecheck_for(code);
63 else if(statement==ID_switch)
64 typecheck_switch(code);
65 else if(statement==ID_break)
66 typecheck_break(code);
67 else if(statement==ID_goto)
69 else if(statement==ID_gcc_computed_goto)
71 else if(statement==ID_continue)
73 else if(statement==ID_return)
75 else if(statement==ID_decl)
76 typecheck_decl(code);
77 else if(statement==ID_assign)
78 typecheck_assign(code);
79 else if(statement==ID_skip)
80 {
81 }
82 else if(statement==ID_asm)
84 else if(statement==ID_start_thread)
86 else if(statement==ID_gcc_local_label)
88 else if(statement==ID_msc_try_finally)
89 {
90 assert(code.operands().size()==2);
91 typecheck_code(to_code(code.op0()));
92 typecheck_code(to_code(code.op1()));
93 }
94 else if(statement==ID_msc_try_except)
95 {
96 assert(code.operands().size()==3);
97 typecheck_code(to_code(code.op0()));
98 typecheck_expr(code.op1());
99 typecheck_code(to_code(code.op2()));
100 }
101 else if(statement==ID_msc_leave)
102 {
103 // fine as is, but should check that we
104 // are in a 'try' block
105 }
106 else if(statement==ID_static_assert)
107 {
108 PRECONDITION(code.operands().size() == 2);
109
110 typecheck_expr(code.op0());
111 typecheck_expr(code.op1());
112
114 make_constant(code.op0());
115
116 if(code.op0().is_false())
117 {
118 // failed
120 error() << "static assertion failed";
121 if(code.op1().id() == ID_string_constant)
122 error() << ": " << to_string_constant(code.op1()).get_value();
123 error() << eom;
124 throw 0;
125 }
126 }
127 else if(statement==ID_CPROVER_try_catch ||
128 statement==ID_CPROVER_try_finally)
129 {
130 assert(code.operands().size()==2);
131 typecheck_code(to_code(code.op0()));
132 typecheck_code(to_code(code.op1()));
133 }
134 else if(statement==ID_CPROVER_throw)
135 {
136 assert(code.operands().empty());
137 }
138 else if(statement==ID_assume ||
139 statement==ID_assert)
140 {
141 // These are not generated by the C/C++ parsers,
142 // but we allow them for the benefit of other users
143 // of the typechecker.
144 assert(code.operands().size()==1);
145 typecheck_expr(code.op0());
146 }
147 else
148 {
150 error() << "unexpected statement: " << statement << eom;
151 throw 0;
152 }
153}
154
156{
157 const irep_idt flavor = code.get_flavor();
158
159 if(flavor==ID_gcc)
160 {
161 // These have 5 operands.
162 // The first operand is a string.
163 // Operands 1, 2, 3, 4 are lists of expressions.
164
165 // Operand 1: OutputOperands
166 // Operand 2: InputOperands
167 // Operand 3: Clobbers
168 // Operand 4: GotoLabels
169
170 auto &code_asm_gcc = to_code_asm_gcc(code);
171
172 typecheck_expr(code_asm_gcc.asm_text());
173
174 // the operands are lists of expressions
176 code_asm_gcc.operands().begin() + 1, code_asm_gcc.operands().end()))
177 {
178 for(auto &expr : op.operands())
179 typecheck_expr(expr);
180 }
181 }
182 else if(flavor==ID_msc)
183 {
184 assert(code.operands().size()==1);
185 typecheck_expr(code.op0());
186 }
187}
188
190{
191 if(code.operands().size()!=2)
192 {
194 error() << "assignment statement expected to have two operands"
195 << eom;
196 throw 0;
197 }
198
199 typecheck_expr(code.op0());
200 typecheck_expr(code.op1());
201
202 implicit_typecast(code.op1(), code.op0().type());
203}
204
206{
207 for(auto &c : code.statements())
209
210 // do decl-blocks
211
212 code_blockt new_ops;
213 new_ops.statements().reserve(code.statements().size());
214
215 for(auto &code_op : code.statements())
216 {
217 if(code_op.is_not_nil())
218 new_ops.add(std::move(code_op));
219 }
220
221 code.statements().swap(new_ops.statements());
222}
223
225{
227 {
229 error() << "break not allowed here" << eom;
230 throw 0;
231 }
232}
233
235{
237 {
239 error() << "continue not allowed here" << eom;
240 throw 0;
241 }
242}
243
245{
246 // this comes with 1 operand, which is a declaration
247 if(code.operands().size()!=1)
248 {
250 error() << "decl expected to have 1 operand" << eom;
251 throw 0;
252 }
253
254 // op0 must be declaration
255 if(code.op0().id()!=ID_declaration)
256 {
258 error() << "decl statement expected to have declaration as operand"
259 << eom;
260 throw 0;
261 }
262
263 ansi_c_declarationt declaration;
264 declaration.swap(code.op0());
265
266 if(declaration.get_is_static_assert())
267 {
268 codet new_code(ID_static_assert);
269 new_code.add_source_location()=code.source_location();
270 new_code.operands().swap(declaration.operands());
271 code.swap(new_code);
272 typecheck_code(code);
273 return; // done
274 }
275
276 typecheck_declaration(declaration);
277
278 std::list<codet> new_code;
279
280 // iterate over declarators
281
282 for(const auto &d : declaration.declarators())
283 {
284 irep_idt identifier = d.get_name();
285
286 // look it up
287 symbol_tablet::symbolst::const_iterator s_it=
288 symbol_table.symbols.find(identifier);
289
290 if(s_it==symbol_table.symbols.end())
291 {
293 error() << "failed to find decl symbol '" << identifier
294 << "' in symbol table" << eom;
295 throw 0;
296 }
297
298 const symbolt &symbol=s_it->second;
299
300 // This must not be an incomplete type, unless it's 'extern'
301 // or a typedef.
302 if(!symbol.is_type &&
303 !symbol.is_extern &&
304 !is_complete_type(symbol.type))
305 {
307 error() << "incomplete type not permitted here" << eom;
308 throw 0;
309 }
310
311 // see if it's a typedef
312 // or a function
313 // or static
314 if(symbol.is_type || symbol.type.id() == ID_code)
315 {
316 // we ignore
317 }
318 else if(symbol.is_static_lifetime)
319 {
320 // make sure the initialization value is a compile-time constant
321 if(symbol.value.is_not_nil())
322 {
323 exprt init_value = symbol.value;
324 make_constant(init_value);
325 }
326 }
327 else
328 {
329 code_frontend_declt decl(symbol.symbol_expr());
330 decl.add_source_location() = symbol.location;
331 decl.symbol().add_source_location() = symbol.location;
332
333 // add initializer, if any
334 if(symbol.value.is_not_nil())
335 {
336 decl.operands().resize(2);
337 decl.op1() = symbol.value;
338 }
339
340 new_code.push_back(decl);
341 }
342 }
343
344 // stash away any side-effects in the declaration
345 new_code.splice(new_code.begin(), clean_code);
346
347 if(new_code.empty())
348 {
349 source_locationt source_location=code.source_location();
350 code=code_skipt();
351 code.add_source_location()=source_location;
352 }
353 else if(new_code.size()==1)
354 {
355 code.swap(new_code.front());
356 }
357 else
358 {
359 // build a decl-block
360 auto code_block=code_blockt::from_list(new_code);
361 code_block.set_statement(ID_decl_block);
362 code.swap(code_block);
363 }
364}
365
367{
368 if(type.id() == ID_array)
369 {
370 const auto &array_type = to_array_type(type);
371
372 if(array_type.size().is_nil())
373 return false;
374
375 return is_complete_type(array_type.element_type());
376 }
377 else if(type.id()==ID_struct || type.id()==ID_union)
378 {
379 const auto &struct_union_type = to_struct_union_type(type);
380
381 if(struct_union_type.is_incomplete())
382 return false;
383
384 for(const auto &c : struct_union_type.components())
385 if(!is_complete_type(c.type()))
386 return false;
387 }
388 else if(type.id()==ID_vector)
389 return is_complete_type(to_vector_type(type).element_type());
390 else if(type.id() == ID_struct_tag || type.id() == ID_union_tag)
391 {
392 return is_complete_type(follow(type));
393 }
394
395 return true;
396}
397
399{
400 if(code.operands().size()!=1)
401 {
403 error() << "expression statement expected to have one operand"
404 << eom;
405 throw 0;
406 }
407
408 exprt &op=code.op0();
409 typecheck_expr(op);
410}
411
413{
414 if(code.operands().size()!=4)
415 {
417 error() << "for expected to have four operands" << eom;
418 throw 0;
419 }
420
421 // the "for" statement has an implicit block around it,
422 // since code.op0() may contain declarations
423 //
424 // we therefore transform
425 //
426 // for(a;b;c) d;
427 //
428 // to
429 //
430 // { a; for(;b;c) d; }
431 //
432 // if config.ansi_c.for_has_scope
433
435 code.op0().is_nil())
436 {
437 if(code.op0().is_not_nil())
438 typecheck_code(to_code(code.op0()));
439
440 if(code.op1().is_nil())
441 code.op1()=true_exprt();
442 else
443 {
444 typecheck_expr(code.op1());
446 }
447
448 if(code.op2().is_not_nil())
449 typecheck_expr(code.op2());
450
451 if(code.op3().is_not_nil())
452 {
453 // save & set flags
454 bool old_break_is_allowed=break_is_allowed;
455 bool old_continue_is_allowed=continue_is_allowed;
456
458
459 // recursive call
460 if(to_code(code.op3()).get_statement()==ID_decl_block)
461 {
462 code_blockt code_block;
463 code_block.add_source_location()=code.op3().source_location();
464
465 code_block.add(std::move(to_code(code.op3())));
466 code.op3().swap(code_block);
467 }
468 typecheck_code(to_code(code.op3()));
469
470 // restore flags
471 break_is_allowed=old_break_is_allowed;
472 continue_is_allowed=old_continue_is_allowed;
473 }
474 }
475 else
476 {
477 code_blockt code_block;
478 code_block.add_source_location()=code.source_location();
479 if(to_code(code.op3()).get_statement()==ID_block)
480 {
481 code_block.set(
482 ID_C_end_location,
484 }
485 else
486 {
487 code_block.set(
488 ID_C_end_location,
489 code.op3().source_location());
490 }
491
492 code_block.reserve_operands(2);
493 code_block.add(std::move(to_code(code.op0())));
494 code.op0().make_nil();
495 code_block.add(std::move(code));
496 code.swap(code_block);
497 typecheck_code(code); // recursive call
498 }
499
502
503 if(code.find(ID_C_spec_assigns).is_not_nil())
504 {
506 static_cast<unary_exprt &>(code.add(ID_C_spec_assigns)).op().operands());
507 }
508}
509
511{
512 // record the label
513 if(!labels_defined.emplace(code.get_label(), code.source_location()).second)
514 {
516 error() << "duplicate label '" << code.get_label() << "'" << eom;
517 throw 0;
518 }
519
520 typecheck_code(code.code());
521}
522
524{
525 if(code.operands().size()!=2)
526 {
528 error() << "switch_case expected to have two operands" << eom;
529 throw 0;
530 }
531
532 typecheck_code(code.code());
533
534 if(code.is_default())
535 {
536 if(!case_is_allowed)
537 {
539 error() << "did not expect default label here" << eom;
540 throw 0;
541 }
542 }
543 else
544 {
545 if(!case_is_allowed)
546 {
548 error() << "did not expect `case' here" << eom;
549 throw 0;
550 }
551
552 exprt &case_expr=code.case_op();
553 typecheck_expr(case_expr);
555 make_constant(case_expr);
556 }
557}
558
561{
562 if(!case_is_allowed)
563 {
565 error() << "did not expect `case' here" << eom;
566 throw 0;
567 }
568
569 typecheck_expr(code.lower());
570 typecheck_expr(code.upper());
573 make_constant(code.lower());
574 make_constant(code.upper());
575 typecheck_code(code.code());
576}
577
579{
580 // these are just declarations, e.g.,
581 // __label__ here, there;
582}
583
585{
586 // we record the label used
588}
589
591{
592 if(code.operands().size()!=1)
593 {
595 error() << "computed-goto expected to have one operand" << eom;
596 throw 0;
597 }
598
599 exprt &dest=code.op0();
600
601 if(dest.id()!=ID_dereference)
602 {
604 error() << "computed-goto expected to have dereferencing operand"
605 << eom;
606 throw 0;
607 }
608
609 typecheck_expr(to_unary_expr(dest).op());
610 dest.type() = void_type();
611}
612
614{
615 if(code.operands().size()!=3)
616 {
618 error() << "ifthenelse expected to have three operands" << eom;
619 throw 0;
620 }
621
622 exprt &cond=code.cond();
623
624 typecheck_expr(cond);
625
626 #if 0
627 if(cond.id()==ID_sideeffect &&
628 cond.get(ID_statement)==ID_assign)
629 {
630 warning("warning: assignment in if condition");
631 }
632 #endif
633
635
636 if(code.then_case().get_statement() == ID_decl_block)
637 {
638 code_blockt code_block({code.then_case()});
639 code_block.add_source_location()=code.then_case().source_location();
640 code.then_case() = code_block;
641 }
642
644
645 if(!code.else_case().is_nil())
646 {
647 if(code.else_case().get_statement() == ID_decl_block)
648 {
649 code_blockt code_block({code.else_case()});
650 code_block.add_source_location()=code.else_case().source_location();
651 code.else_case() = code_block;
652 }
653
655 }
656}
657
659{
660 if(code.operands().size()!=1)
661 {
663 error() << "start_thread expected to have one operand" << eom;
664 throw 0;
665 }
666
667 typecheck_code(to_code(code.op0()));
668}
669
671{
672 if(code.has_return_value())
673 {
675
676 if(return_type.id() == ID_empty)
677 {
678 // gcc doesn't actually complain, it just warns!
679 if(code.return_value().type().id() != ID_empty)
680 {
682
683 warning() << "function has return void ";
684 warning() << "but a return statement returning ";
685 warning() << to_string(code.return_value().type());
686 warning() << eom;
687
689 }
690 }
691 else
693 }
694 else if(
695 return_type.id() != ID_empty && return_type.id() != ID_constructor &&
696 return_type.id() != ID_destructor)
697 {
698 // gcc doesn't actually complain, it just warns!
700 warning() << "non-void function should return a value" << eom;
701
702 code.return_value() =
704 }
705}
706
708{
709 // we expect a code_switcht, but might return either a code_switcht or a
710 // code_blockt, hence don't use code_switcht in the interface
711 code_switcht &code_switch = to_code_switch(code);
712
713 typecheck_expr(code_switch.value());
714
715 // this needs to be promoted
716 implicit_typecast_arithmetic(code_switch.value());
717
718 // save & set flags
719
720 bool old_case_is_allowed(case_is_allowed);
721 bool old_break_is_allowed(break_is_allowed);
722 typet old_switch_op_type(switch_op_type);
723
724 switch_op_type = code_switch.value().type();
726
727 typecheck_code(code_switch.body());
728
729 if(code_switch.body().get_statement() == ID_block)
730 {
731 // Collect all declarations before the first case, if there is any case
732 // (including a default one).
733 code_blockt wrapping_block;
734
735 code_blockt &body_block = to_code_block(code_switch.body());
736 for(auto &statement : body_block.statements())
737 {
738 if(statement.get_statement() == ID_switch_case)
739 break;
740 else if(statement.get_statement() == ID_decl)
741 {
742 if(statement.operands().size() == 1)
743 {
744 wrapping_block.add(code_skipt());
745 wrapping_block.statements().back().swap(statement);
746 }
747 else
748 {
749 PRECONDITION(statement.operands().size() == 2);
750 wrapping_block.add(statement);
751 wrapping_block.statements().back().operands().pop_back();
752 statement.set_statement(ID_assign);
753 }
754 }
755 }
756
757 if(!wrapping_block.statements().empty())
758 {
759 wrapping_block.add(std::move(code));
760 code.swap(wrapping_block);
761 }
762 }
763
764 // restore flags
765 case_is_allowed=old_case_is_allowed;
766 break_is_allowed=old_break_is_allowed;
767 switch_op_type=old_switch_op_type;
768}
769
771{
772 if(code.operands().size()!=2)
773 {
775 error() << "while expected to have two operands" << eom;
776 throw 0;
777 }
778
779 typecheck_expr(code.cond());
781
782 // save & set flags
783 bool old_break_is_allowed(break_is_allowed);
784 bool old_continue_is_allowed(continue_is_allowed);
785
787
788 if(code.body().get_statement()==ID_decl_block)
789 {
790 code_blockt code_block({code.body()});
791 code_block.add_source_location()=code.body().source_location();
792 code.body() = code_block;
793 }
794 typecheck_code(code.body());
795
796 // restore flags
797 break_is_allowed=old_break_is_allowed;
798 continue_is_allowed=old_continue_is_allowed;
799
802
803 if(code.find(ID_C_spec_assigns).is_not_nil())
804 {
806 static_cast<unary_exprt &>(code.add(ID_C_spec_assigns)).op().operands());
807 }
808}
809
811{
812 if(code.operands().size()!=2)
813 {
815 error() << "do while expected to have two operands" << eom;
816 throw 0;
817 }
818
819 typecheck_expr(code.cond());
821
822 // save & set flags
823 bool old_break_is_allowed(break_is_allowed);
824 bool old_continue_is_allowed(continue_is_allowed);
825
827
828 if(code.body().get_statement()==ID_decl_block)
829 {
830 code_blockt code_block({code.body()});
831 code_block.add_source_location()=code.body().source_location();
832 code.body() = code_block;
833 }
834 typecheck_code(code.body());
835
836 // restore flags
837 break_is_allowed=old_break_is_allowed;
838 continue_is_allowed=old_continue_is_allowed;
839
842
843 if(code.find(ID_C_spec_assigns).is_not_nil())
844 {
846 static_cast<unary_exprt &>(code.add(ID_C_spec_assigns)).op().operands());
847 }
848}
849
851{
852 // compute type
853 typecheck_expr(condition);
854
855 // make it boolean if needed
856 implicit_typecast_bool(condition);
857
858 // non-fatal warnings
860 {
861 // Remark: we allow function calls without further checks for now because
862 // they are mandatory for some applications.
863 // The next step must be to check that the called functions have a contract
864 // with an empty assigns clause and that they indeed satisfy their contract
865 // using a CI check.
867 warning()
868 << "function with possible side-effect called in target's condition"
869 << eom;
870 }
871
872 // fatal errors
873 bool must_throw = false;
874
875 if(condition.type().id() == ID_empty)
876 {
877 must_throw = true;
878 error().source_location = condition.source_location();
879 error() << "void-typed expressions not allowed as assigns clause conditions"
880 << eom;
881 }
882
883 if(has_subexpr(condition, [&](const exprt &subexpr) {
884 return can_cast_expr<side_effect_exprt>(subexpr) &&
886 }))
887 {
888 must_throw = true;
889 error().source_location = condition.source_location();
890 error() << "side-effects not allowed in assigns clause conditions" << eom;
891 }
892
893 if(has_subexpr(condition, ID_if))
894 {
895 must_throw = true;
896 error().source_location = condition.source_location();
897 error() << "ternary expressions not allowed in assigns "
898 "clause conditions"
899 << eom;
900 }
901
902 if(must_throw)
903 throw 0;
904}
905
907{
908 // compute type
909 typecheck_expr(target);
910
911 // fatal errors
912 bool must_throw = false;
913 if(target.type().id() == ID_empty)
914 {
915 must_throw = true;
917 error() << "void-typed expressions not allowed as assigns clause targets"
918 << eom;
919 }
920
921 if(!target.get_bool(ID_C_lvalue) && target.id() != ID_pointer_object)
922 {
923 must_throw = true;
925 error() << "assigns clause target must be an lvalue or " CPROVER_PREFIX
926 "POINTER_OBJECT expression"
927 << eom;
928 }
929
930 // Remark: an expression can be an lvalue and still contain side effects
931 // or ternary expressions. We detect them in a second step.
932 if(has_subexpr(target, ID_side_effect))
933 {
934 must_throw = true;
936 error() << "side-effects not allowed in assigns clause targets" << eom;
937 }
938
939 if(has_subexpr(target, ID_if))
940 {
941 must_throw = true;
943 error() << "ternary expressions not allowed in assigns "
944 "clause targets"
945 << eom;
946 }
947
948 if(must_throw)
949 throw 0;
950}
951
953{
955 bool must_throw = false;
956
957 for(auto &target : targets)
958 {
960 {
961 must_throw = true;
962 error().source_location = target.source_location();
963 error() << "expected ID_conditional_target_group expression in assigns "
964 "clause, found "
965 << id2string(target.id()) << eom;
966 }
967
968 auto &conditional_target_group = to_conditional_target_group_expr(target);
969 validate_expr(conditional_target_group);
970
971 // typecheck condition
972 auto &condition = conditional_target_group.condition();
974
975 if(condition.is_true())
976 {
977 // if the condition is trivially true,
978 // simplify expr and expose the bare expressions
979 for(auto &actual_target : conditional_target_group.targets())
980 {
981 typecheck_spec_assigns_target(actual_target);
982 tmp.push_back(actual_target);
983 }
984 }
985 else
986 {
987 // if the condition is not trivially true, typecheck in place
988 for(auto &actual_target : conditional_target_group.targets())
989 {
990 typecheck_spec_assigns_target(actual_target);
991 }
992 tmp.push_back(std::move(target));
993 }
994 }
995
996 // at least one target was not as expected
997 if(must_throw)
998 throw 0;
999
1000 // now each target is either:
1001 // - a simple side-effect-free unconditional lvalue expression or
1002 // - a conditional target group expression with a non-trivial condition
1003
1004 // update original vector in-place
1005 std::swap(targets, tmp);
1006}
1007
1009{
1010 if(code.find(ID_C_spec_loop_invariant).is_not_nil())
1011 {
1012 for(auto &invariant :
1013 (static_cast<exprt &>(code.add(ID_C_spec_loop_invariant)).operands()))
1014 {
1015 typecheck_expr(invariant);
1016 implicit_typecast_bool(invariant);
1018 invariant,
1019 ID_old,
1020 CPROVER_PREFIX "old is not allowed in loop invariants.");
1021 }
1022 }
1023}
1024
1026{
1027 if(code.find(ID_C_spec_decreases).is_not_nil())
1028 {
1029 for(auto &decreases_clause_component :
1030 (static_cast<exprt &>(code.add(ID_C_spec_decreases)).operands()))
1031 {
1032 typecheck_expr(decreases_clause_component);
1033 implicit_typecast_arithmetic(decreases_clause_component);
1034 }
1035 }
1036}
ANSI-CC Language Type Checking.
API to expression classes that are internal to the C frontend.
const conditional_target_group_exprt & to_conditional_target_group_expr(const exprt &expr)
Cast an exprt to a conditional_target_group_exprt.
Definition: c_expr.h:305
bool can_cast_expr< conditional_target_group_exprt >(const exprt &base)
Definition: c_expr.h:293
void validate_expr(const shuffle_vector_exprt &value)
Definition: c_expr.h:81
ANSI-C Language Type Checking.
empty_typet void_type()
Definition: c_types.cpp:263
const declaratorst & declarators() const
bool get_is_static_assert() const
virtual void implicit_typecast(exprt &expr, const typet &type)
virtual void typecheck_break(codet &code)
std::map< irep_idt, source_locationt > labels_used
virtual void typecheck_expr(exprt &expr)
virtual void typecheck_block(code_blockt &code)
virtual void typecheck_code(codet &code)
virtual void typecheck_while(code_whilet &code)
void disallow_subexpr_by_id(const exprt &, const irep_idt &, const std::string &) const
virtual void typecheck_spec_assigns_condition(exprt &condition)
virtual void typecheck_decl(codet &code)
virtual void typecheck_spec_decreases(codet &code)
virtual void make_constant(exprt &expr)
virtual void typecheck_assign(codet &expr)
virtual void typecheck_continue(codet &code)
symbol_tablet & symbol_table
virtual void implicit_typecast_arithmetic(exprt &expr)
std::list< codet > clean_code
virtual std::string to_string(const exprt &expr)
void typecheck_declaration(ansi_c_declarationt &)
virtual void typecheck_spec_assigns_target(exprt &target)
virtual void typecheck_gcc_local_label(codet &code)
virtual void start_typecheck_code()
virtual void typecheck_asm(code_asmt &code)
virtual void typecheck_gcc_computed_goto(codet &code)
virtual void typecheck_for(codet &code)
virtual void typecheck_switch(codet &code)
virtual void typecheck_expression(codet &code)
virtual void typecheck_return(code_frontend_returnt &)
virtual void typecheck_spec_assigns(exprt::operandst &targets)
virtual bool is_complete_type(const typet &type) const
virtual void typecheck_start_thread(codet &code)
virtual void typecheck_switch_case(code_switch_caset &code)
virtual void typecheck_spec_loop_invariant(codet &code)
virtual void typecheck_gcc_switch_case_range(code_gcc_switch_case_ranget &)
virtual void implicit_typecast_bool(exprt &expr)
virtual void typecheck_dowhile(code_dowhilet &code)
virtual void typecheck_ifthenelse(code_ifthenelset &code)
virtual void typecheck_goto(code_gotot &code)
virtual void typecheck_label(code_labelt &code)
std::map< irep_idt, source_locationt > labels_defined
codet representation of an inline assembler statement.
Definition: std_code.h:1253
const irep_idt & get_flavor() const
Definition: std_code.h:1263
A codet representing sequential composition of program statements.
Definition: std_code.h:130
static code_blockt from_list(const std::list< codet > &_list)
Definition: std_code.h:148
code_operandst & statements()
Definition: std_code.h:138
source_locationt end_location() const
Definition: std_code.h:187
void add(const codet &code)
Definition: std_code.h:168
codet representation of a do while statement.
Definition: std_code.h:672
const codet & body() const
Definition: std_code.h:689
const exprt & cond() const
Definition: std_code.h:679
A codet representing the declaration of a local variable.
Definition: std_code.h:347
symbol_exprt & symbol()
Definition: std_code.h:354
codet representation of a "return from a function" statement.
Definition: std_code.h:893
const exprt & return_value() const
Definition: std_code.h:903
bool has_return_value() const
Definition: std_code.h:913
codet representation of a switch-case, i.e. a case statement within a switch.
Definition: std_code.h:1097
const exprt & upper() const
upper bound of range
Definition: std_code.h:1119
const exprt & lower() const
lower bound of range
Definition: std_code.h:1107
codet & code()
the statement to be executed when the case applies
Definition: std_code.h:1131
codet representation of a goto statement.
Definition: std_code.h:841
const irep_idt & get_destination() const
Definition: std_code.h:853
codet representation of an if-then-else statement.
Definition: std_code.h:460
const exprt & cond() const
Definition: std_code.h:478
const codet & else_case() const
Definition: std_code.h:498
const codet & then_case() const
Definition: std_code.h:488
codet representation of a label for branch targets.
Definition: std_code.h:959
const irep_idt & get_label() const
Definition: std_code.h:967
codet & code()
Definition: std_code.h:977
A codet representing a skip statement.
Definition: std_code.h:322
codet representation of a switch-case, i.e. a case statement within a switch.
Definition: std_code.h:1023
const exprt & case_op() const
Definition: std_code.h:1040
codet & code()
Definition: std_code.h:1050
bool is_default() const
Definition: std_code.h:1030
codet representing a switch statement.
Definition: std_code.h:548
const codet & body() const
Definition: std_code.h:565
const exprt & value() const
Definition: std_code.h:555
codet representing a while statement.
Definition: std_code.h:610
const exprt & cond() const
Definition: std_code.h:617
const codet & body() const
Definition: std_code.h:627
Data structure for representing an arbitrary statement in a program.
Definition: std_code_base.h:29
exprt & op3()
Definition: expr.h:108
exprt & op0()
Definition: expr.h:99
exprt & op1()
Definition: expr.h:102
exprt & op2()
Definition: expr.h:105
const irep_idt & get_statement() const
Definition: std_code_base.h:65
struct configt::ansi_ct ansi_c
dstringt has one field, an unsigned integer no which is an index into a static table of strings.
Definition: dstring.h:37
The empty type.
Definition: std_types.h:51
Base class for all expressions.
Definition: expr.h:54
const source_locationt & find_source_location() const
Get a source_locationt from the expression or from its operands (non-recursively).
Definition: expr.cpp:165
std::vector< exprt > operandst
Definition: expr.h:56
bool is_false() const
Return whether the expression is a constant representing false.
Definition: expr.cpp:42
void reserve_operands(operandst::size_type n)
Definition: expr.h:124
typet & type()
Return the type of the expression.
Definition: expr.h:82
operandst & operands()
Definition: expr.h:92
const source_locationt & source_location() const
Definition: expr.h:230
source_locationt & add_source_location()
Definition: expr.h:235
bool get_bool(const irep_idt &name) const
Definition: irep.cpp:58
std::string pretty(unsigned indent=0, unsigned max_indent=0) const
Definition: irep.cpp:495
const irept & find(const irep_idt &name) const
Definition: irep.cpp:106
const irep_idt & get(const irep_idt &name) const
Definition: irep.cpp:45
void set(const irep_idt &name, const irep_idt &value)
Definition: irep.h:420
bool is_not_nil() const
Definition: irep.h:380
void make_nil()
Definition: irep.h:454
void swap(irept &irep)
Definition: irep.h:442
const irep_idt & id() const
Definition: irep.h:396
irept & add(const irep_idt &name)
Definition: irep.cpp:116
bool is_nil() const
Definition: irep.h:376
source_locationt source_location
Definition: message.h:247
mstreamt & error() const
Definition: message.h:399
mstreamt & warning() const
Definition: message.h:404
static eomt eom
Definition: message.h:297
const typet & follow(const typet &) const
Resolve type symbol to the type it points to.
Definition: namespace.cpp:49
A side_effect_exprt that returns a non-deterministically chosen value.
Definition: std_code.h:1520
const irep_idt & get_value() const
const symbolst & symbols
Read-only field, used to look up symbols given their names.
Symbol table entry.
Definition: symbol.h:28
bool is_extern
Definition: symbol.h:66
bool is_static_lifetime
Definition: symbol.h:65
bool is_type
Definition: symbol.h:61
source_locationt location
Source code location of definition of symbol.
Definition: symbol.h:37
class symbol_exprt symbol_expr() const
Produces a symbol_exprt for a symbol.
Definition: symbol.cpp:121
typet type
Type of symbol.
Definition: symbol.h:31
exprt value
Initial value of symbol.
Definition: symbol.h:34
The Boolean constant true.
Definition: std_expr.h:2856
Semantic type conversion.
Definition: std_expr.h:1920
The type of an expression, extends irept.
Definition: type.h:29
Generic base class for unary expressions.
Definition: std_expr.h:281
const exprt & op() const
Definition: std_expr.h:293
configt config
Definition: config.cpp:25
#define CPROVER_PREFIX
bool has_subexpr(const exprt &expr, const std::function< bool(const exprt &)> &pred)
returns true if the expression has a subexpression that satisfies pred
Definition: expr_util.cpp:138
Deprecated expression utility functions.
const std::string & id2string(const irep_idt &d)
Definition: irep.h:47
Ranges: pair of begin and end iterators, which can be initialized from containers,...
#define PRECONDITION(CONDITION)
Definition: invariant.h:463
const code_switch_caset & to_code_switch_case(const codet &code)
Definition: std_code.h:1077
const code_gotot & to_code_goto(const codet &code)
Definition: std_code.h:875
code_asm_gcct & to_code_asm_gcc(codet &code)
Definition: std_code.h:1373
const code_frontend_returnt & to_code_frontend_return(const codet &code)
Definition: std_code.h:943
const code_dowhilet & to_code_dowhile(const codet &code)
Definition: std_code.h:716
const code_whilet & to_code_while(const codet &code)
Definition: std_code.h:654
const code_labelt & to_code_label(const codet &code)
Definition: std_code.h:1004
bool can_cast_expr< side_effect_expr_function_callt >(const exprt &base)
Definition: std_code.h:1730
const code_blockt & to_code_block(const codet &code)
Definition: std_code.h:203
const code_ifthenelset & to_code_ifthenelse(const codet &code)
Definition: std_code.h:530
const code_gcc_switch_case_ranget & to_code_gcc_switch_case_range(const codet &code)
Definition: std_code.h:1161
bool can_cast_expr< side_effect_exprt >(const exprt &base)
Definition: std_code.h:1498
code_asmt & to_code_asm(codet &code)
Definition: std_code.h:1282
const code_switcht & to_code_switch(const codet &code)
Definition: std_code.h:592
const codet & to_code(const exprt &expr)
const unary_exprt & to_unary_expr(const exprt &expr)
Cast an exprt to a unary_exprt.
Definition: std_expr.h:328
const vector_typet & to_vector_type(const typet &type)
Cast a typet to a vector_typet.
Definition: std_types.h:1040
const array_typet & to_array_type(const typet &type)
Cast a typet to an array_typet.
Definition: std_types.h:832
const struct_union_typet & to_struct_union_type(const typet &type)
Cast a typet to a struct_union_typet.
Definition: std_types.h:214
const string_constantt & to_string_constant(const exprt &expr)
bool for_has_scope
Definition: config.h:123
A range is a pair of a begin and an end iterators.
Definition: range.h:396