153 lines · cpp
1// RUN: %clang_cc1 -Wuninitialized -Wno-uninitialized-const-reference -fsyntax-only -fcxx-exceptions %s -verify -std=c++1y2 3// Stub out types for 'typeid' to work.4namespace std { class type_info {}; }5 6int test1_aux(int &x);7int test1() {8 int x;9 test1_aux(x);10 return x; // no-warning11}12 13int test2_aux() {14 int x;15 int &y = x;16 return x; // no-warning17}18 19// Don't warn on unevaluated contexts.20void unevaluated_tests() {21 int x;22 (void)sizeof(x);23 (void)typeid(x);24}25 26// Warn for glvalue arguments to typeid whose type is polymorphic.27struct A { virtual ~A() {} };28void polymorphic_test() {29 A *a; // expected-note{{initialize the variable 'a' to silence this warning}}30 (void)typeid(*a); // expected-warning{{variable 'a' is uninitialized when used here}}31}32 33// Handle cases where the CFG may constant fold some branches, thus34// mitigating the need for some path-sensitivity in the analysis.35unsigned test3_aux();36unsigned test3() {37 unsigned x = 0;38 const bool flag = true;39 if (flag && (x = test3_aux()) == 0) {40 return x;41 }42 return x;43}44unsigned test3_b() {45 unsigned x ;46 const bool flag = true;47 if (flag && (x = test3_aux()) == 0) {48 x = 1;49 }50 return x; // no-warning51}52unsigned test3_c() {53 unsigned x; // expected-note{{initialize the variable 'x' to silence this warning}}54 const bool flag = false;55 if (flag && (x = test3_aux()) == 0) {56 x = 1;57 }58 return x; // expected-warning{{variable 'x' is uninitialized when used here}}59}60 61enum test4_A {62 test4_A_a, test_4_A_b63};64test4_A test4() {65 test4_A a; // expected-note{{variable 'a' is declared here}}66 return a; // expected-warning{{variable 'a' is uninitialized when used here}}67}68 69// Test variables getting invalidated by function calls with reference arguments70// *AND* there are multiple invalidated arguments.71void test5_aux(int &, int &);72 73int test5() {74 int x, y;75 test5_aux(x, y);76 return x + y; // no-warning77}78 79// This test previously crashed Sema.80class Rdar9188004A {81public: 82 virtual ~Rdar9188004A();83};84 85template< typename T > class Rdar9188004B : public Rdar9188004A {86virtual double *foo(Rdar9188004B *next) const {87 double *values = next->foo(0);88 try {89 }90 catch(double e) {91 values[0] = e;92 }93 return 0;94 }95};96class Rdar9188004C : public Rdar9188004B<Rdar9188004A> {97 virtual void bar(void) const;98};99void Rdar9188004C::bar(void) const {}100 101// Don't warn about uninitialized variables in unreachable code.102void PR9625() {103 if (false) {104 int x;105 (void)static_cast<float>(x); // no-warning106 }107}108 109// Don't warn about variables declared in "catch"110void RDar9251392_bar(const char *msg);111 112void RDar9251392() {113 try {114 throw "hi";115 }116 catch (const char* msg) {117 RDar9251392_bar(msg); // no-warning118 }119}120 121// Test handling of "no-op" casts.122void test_noop_cast()123{124 int x = 1;125 int y = (int&)x; // no-warning126}127 128void test_noop_cast2() {129 int x; // expected-note {{initialize the variable 'x' to silence this warning}}130 int y = (int&)x; // expected-warning {{uninitialized when used here}}131}132 133// Test handling of bit casts.134void test_bitcasts() {135 int x = 1;136 int y = (float &)x; // no-warning137}138 139void test_bitcasts_2() {140 int x; // expected-note {{initialize the variable 'x' to silence this warning}}141 int y = (float &)x; // expected-warning {{uninitialized when used here}}142}143 144void consume_const_ref(const int &n);145int test_const_ref() {146 int n; // expected-note {{variable}}147 consume_const_ref(n);148 return n; // expected-warning {{uninitialized when used here}}149}150 151// Don't crash here.152auto PR19996 = [a=0]{int t; return a;};153