1 // RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection \
2 // RUN:   -analyzer-config crosscheck-with-z3=true -verify %s
3 //
4 // RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection \
5 // RUN:   -verify %s
6 //
7 // RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection \
8 // RUN:   -analyzer-config support-symbolic-integer-casts=true -verify=symbolic %s
9 //
10 // RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection \
11 // RUN:   -analyzer-config support-symbolic-integer-casts=false -verify %s
12 //
13 // REQUIRES: asserts, z3
14 //
15 // Requires z3 only for refutation. Works with both constraint managers.
16 
17 void clang_analyzer_dump(int);
18 
19 using sugar_t = unsigned char;
20 
21 // Enum types
22 enum class ScopedSugared : sugar_t {};
23 enum class ScopedPrimitive : unsigned char {};
24 enum UnscopedSugared : sugar_t {};
25 enum UnscopedPrimitive : unsigned char {};
26 
27 template <typename T>
28 T conjure();
29 
30 void test_enum_types() {
31   // Let's construct a 'binop(sym, int)', where the binop will trigger an
32   // integral promotion to int. Note that we need to first explicit cast
33   // the scoped-enum to an integral, to make it compile. We could have choosen
34   // any other binary operator.
35   int sym1 = static_cast<unsigned char>(conjure<ScopedSugared>()) & 0x0F;
36   int sym2 = static_cast<unsigned char>(conjure<ScopedPrimitive>()) & 0x0F;
37   int sym3 = static_cast<unsigned char>(conjure<UnscopedSugared>()) & 0x0F;
38   int sym4 = static_cast<unsigned char>(conjure<UnscopedPrimitive>()) & 0x0F;
39 
40   // We need to introduce a constraint referring to the binop, to get it
41   // serialized during the z3-refutation.
42   if (sym1 && sym2 && sym3 && sym4) {
43     // no-crash on these dumps
44     //
45     // The 'clang_analyzer_dump' will construct a bugreport, which in turn will
46     // trigger a z3-refutation. Refutation will walk the bugpath, collect and
47     // serialize the path-constraints into z3 expressions. The binop will
48     // operate over 'int' type, but the symbolic operand might have a different
49     // type - surprisingly.
50     // Historically, the static analyzer did not emit symbolic casts in a lot
51     // of cases, not even when the c++ standard mandated it, like for casting
52     // a scoped enum to its underlying type. Hence, during the z3 constraint
53     // serialization, it made up these 'missing' integral casts - for the
54     // implicit cases at least.
55     // However, it would still not emit the cast for missing explicit casts,
56     // hence 8-bit wide symbol would be bitwise 'and'-ed with a 32-bit wide
57     // int, violating an assertion stating that the operands should have the
58     // same bitwidths.
59 
60     clang_analyzer_dump(sym1);
61     // expected-warning-re@-1 {{((unsigned char) (conj_${{[0-9]+}}{enum ScopedSugared, LC{{[0-9]+}}, S{{[0-9]+}}, #{{[0-9]+}}})) & 15}}
62     // symbolic-warning-re@-2           {{((int) (conj_${{[0-9]+}}{enum ScopedSugared, LC{{[0-9]+}}, S{{[0-9]+}}, #{{[0-9]+}}})) & 15}}
63 
64     clang_analyzer_dump(sym2);
65     // expected-warning-re@-1 {{((unsigned char) (conj_${{[0-9]+}}{enum ScopedPrimitive, LC{{[0-9]+}}, S{{[0-9]+}}, #{{[0-9]+}}})) & 15}}
66     // symbolic-warning-re@-2           {{((int) (conj_${{[0-9]+}}{enum ScopedPrimitive, LC{{[0-9]+}}, S{{[0-9]+}}, #{{[0-9]+}}})) & 15}}
67 
68     clang_analyzer_dump(sym3);
69     // expected-warning-re@-1        {{(conj_${{[0-9]+}}{enum UnscopedSugared, LC{{[0-9]+}}, S{{[0-9]+}}, #{{[0-9]+}}}) & 15}}
70     // symbolic-warning-re@-2 {{((int) (conj_${{[0-9]+}}{enum UnscopedSugared, LC{{[0-9]+}}, S{{[0-9]+}}, #{{[0-9]+}}})) & 15}}
71 
72     clang_analyzer_dump(sym4);
73     // expected-warning-re@-1        {{(conj_${{[0-9]+}}{enum UnscopedPrimitive, LC{{[0-9]+}}, S{{[0-9]+}}, #{{[0-9]+}}}) & 15}}
74     // symbolic-warning-re@-2 {{((int) (conj_${{[0-9]+}}{enum UnscopedPrimitive, LC{{[0-9]+}}, S{{[0-9]+}}, #{{[0-9]+}}})) & 15}}
75   }
76 }
77 
78