| 1 | // RUN: %clang_cc1 -fsyntax-only -Wuninitialized -fsyntax-only -fcxx-exceptions %s -verify -std=c++1y |
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| 2 | |
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| 3 | // Stub out types for 'typeid' to work. |
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| 4 | namespace std { class type_info {}; } |
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| 5 | |
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| 6 | int test1_aux(int &x); |
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| 7 | int test1() { |
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| 8 | int x; |
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| 9 | test1_aux(x); |
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| 10 | return x; // no-warning |
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| 11 | } |
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| 12 | |
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| 13 | int test2_aux() { |
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| 14 | int x; |
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| 15 | int &y = x; |
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| 16 | return x; // no-warning |
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| 17 | } |
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| 18 | |
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| 19 | // Don't warn on unevaluated contexts. |
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| 20 | void unevaluated_tests() { |
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| 21 | int x; |
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| 22 | (void)sizeof(x); |
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| 23 | (void)typeid(x); |
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| 24 | } |
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| 25 | |
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| 26 | // Warn for glvalue arguments to typeid whose type is polymorphic. |
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| 27 | struct A { virtual ~A() {} }; |
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| 28 | void polymorphic_test() { |
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| 29 | A *a; // expected-note{{initialize the variable 'a' to silence this warning}} |
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| 30 | (void)typeid(*a); // expected-warning{{variable 'a' is uninitialized when used here}} |
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| 31 | } |
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| 32 | |
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| 33 | // Handle cases where the CFG may constant fold some branches, thus |
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| 34 | // mitigating the need for some path-sensitivity in the analysis. |
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| 35 | unsigned test3_aux(); |
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| 36 | unsigned test3() { |
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| 37 | unsigned x = 0; |
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| 38 | const bool flag = true; |
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| 39 | if (flag && (x = test3_aux()) == 0) { |
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| 40 | return x; |
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| 41 | } |
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| 42 | return x; |
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| 43 | } |
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| 44 | unsigned test3_b() { |
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| 45 | unsigned x ; |
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| 46 | const bool flag = true; |
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| 47 | if (flag && (x = test3_aux()) == 0) { |
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| 48 | x = 1; |
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| 49 | } |
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| 50 | return x; // no-warning |
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| 51 | } |
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| 52 | unsigned test3_c() { |
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| 53 | unsigned x; // expected-note{{initialize the variable 'x' to silence this warning}} |
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| 54 | const bool flag = false; |
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| 55 | if (flag && (x = test3_aux()) == 0) { |
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| 56 | x = 1; |
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| 57 | } |
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| 58 | return x; // expected-warning{{variable 'x' is uninitialized when used here}} |
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| 59 | } |
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| 60 | |
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| 61 | enum test4_A { |
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| 62 | test4_A_a, test_4_A_b |
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| 63 | }; |
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| 64 | test4_A test4() { |
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| 65 | test4_A a; // expected-note{{variable 'a' is declared here}} |
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| 66 | return a; // expected-warning{{variable 'a' is uninitialized when used here}} |
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| 67 | } |
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| 68 | |
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| 69 | // Test variables getting invalidated by function calls with reference arguments |
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| 70 | // *AND* there are multiple invalidated arguments. |
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| 71 | void test5_aux(int &, int &); |
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| 72 | |
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| 73 | int test5() { |
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| 74 | int x, y; |
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| 75 | test5_aux(x, y); |
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| 76 | return x + y; // no-warning |
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| 77 | } |
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| 78 | |
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| 79 | // This test previously crashed Sema. |
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| 80 | class Rdar9188004A { |
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| 81 | public: |
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| 82 | virtual ~Rdar9188004A(); |
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| 83 | }; |
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| 84 | |
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| 85 | template< typename T > class Rdar9188004B : public Rdar9188004A { |
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| 86 | virtual double *foo(Rdar9188004B *next) const { |
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| 87 | double *values = next->foo(0); |
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| 88 | try { |
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| 89 | } |
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| 90 | catch(double e) { |
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| 91 | values[0] = e; |
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| 92 | } |
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| 93 | return 0; |
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| 94 | } |
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| 95 | }; |
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| 96 | class Rdar9188004C : public Rdar9188004B<Rdar9188004A> { |
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| 97 | virtual void bar(void) const; |
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| 98 | }; |
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| 99 | void Rdar9188004C::bar(void) const {} |
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| 100 | |
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| 101 | // Don't warn about uninitialized variables in unreachable code. |
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| 102 | void PR9625() { |
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| 103 | if (false) { |
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| 104 | int x; |
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| 105 | (void)static_cast<float>(x); // no-warning |
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| 106 | } |
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| 107 | } |
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| 108 | |
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| 109 | // Don't warn about variables declared in "catch" |
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| 110 | void RDar9251392_bar(const char *msg); |
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| 111 | |
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| 112 | void RDar9251392() { |
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| 113 | try { |
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| 114 | throw "hi"; |
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| 115 | } |
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| 116 | catch (const char* msg) { |
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| 117 | RDar9251392_bar(msg); // no-warning |
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| 118 | } |
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| 119 | } |
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| 120 | |
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| 121 | // Test handling of "no-op" casts. |
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| 122 | void test_noop_cast() |
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| 123 | { |
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| 124 | int x = 1; |
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| 125 | int y = (int&)x; // no-warning |
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| 126 | } |
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| 127 | |
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| 128 | void test_noop_cast2() { |
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| 129 | int x; // expected-note {{initialize the variable 'x' to silence this warning}} |
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| 130 | int y = (int&)x; // expected-warning {{uninitialized when used here}} |
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| 131 | } |
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| 132 | |
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| 133 | // Test handling of bit casts. |
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| 134 | void test_bitcasts() { |
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| 135 | int x = 1; |
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| 136 | int y = (float &)x; // no-warning |
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| 137 | } |
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| 138 | |
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| 139 | void test_bitcasts_2() { |
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| 140 | int x; // expected-note {{initialize the variable 'x' to silence this warning}} |
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| 141 | int y = (float &)x; // expected-warning {{uninitialized when used here}} |
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| 142 | } |
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| 143 | |
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| 144 | void consume_const_ref(const int &n); |
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| 145 | int test_const_ref() { |
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| 146 | int n; // expected-note {{variable}} |
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| 147 | consume_const_ref(n); |
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| 148 | return n; // expected-warning {{uninitialized when used here}} |
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| 149 | } |
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| 150 | |
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| 151 | // Don't crash here. |
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| 152 | auto PR19996 = [a=0]{int t; return a;}; |
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| 153 | |
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