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+// RUN: %clang_cc1 -fsyntax-only -Wall -Wuninitialized -std=c++11 -verify %s
+
+int foo(int x);
+int bar(int* x);
+int boo(int& x);
+int far(const int& x);
+
+// Test self-references within initializers which are guaranteed to be
+// uninitialized.
+int a = a; // no-warning: used to signal intended lack of initialization.
+int b = b + 1; // expected-warning {{variable 'b' is uninitialized when used within its own initialization}}
+int c = (c + c); // expected-warning 2 {{variable 'c' is uninitialized when used within its own initialization}}
+void test() {
+ int d = ({ d + d ;}); // expected-warning {{variable 'd' is uninitialized when used within its own initialization}}
+}
+int e = static_cast<long>(e) + 1; // expected-warning {{variable 'e' is uninitialized when used within its own initialization}}
+int f = foo(f); // expected-warning {{variable 'f' is uninitialized when used within its own initialization}}
+
+// Thes don't warn as they don't require the value.
+int g = sizeof(g);
+void* ptr = &ptr;
+int h = bar(&h);
+int i = boo(i);
+int j = far(j);
+int k = __alignof__(k);
+
+
+// Test self-references with record types.
+class A {
+ // Non-POD class.
+ public:
+ enum count { ONE, TWO, THREE };
+ int num;
+ static int count;
+ int get() const { return num; }
+ int get2() { return num; }
+ void set(int x) { num = x; }
+ static int zero() { return 0; }
+
+ A() {}
+ A(A const &a) {}
+ A(int x) {}
+ A(int *x) {}
+ A(A *a) {}
+ ~A();
+};
+
+A getA() { return A(); }
+A getA(int x) { return A(); }
+A getA(A* a) { return A(); }
+
+void setupA() {
+ A a1;
+ a1.set(a1.get());
+ A a2(a1.get());
+ A a3(a1);
+ A a4(&a4);
+ A a5(a5.zero());
+ A a6(a6.ONE);
+ A a7 = getA();
+ A a8 = getA(a8.TWO);
+ A a9 = getA(&a9);
+ A a10(a10.count);
+
+ A a11(a11); // expected-warning {{variable 'a11' is uninitialized when used within its own initialization}}
+ A a12(a12.get()); // expected-warning {{variable 'a12' is uninitialized when used within its own initialization}}
+ A a13(a13.num); // expected-warning {{variable 'a13' is uninitialized when used within its own initialization}}
+ A a14 = A(a14); // expected-warning {{variable 'a14' is uninitialized when used within its own initialization}}
+ A a15 = getA(a15.num); // expected-warning {{variable 'a15' is uninitialized when used within its own initialization}}
+ A a16(&a16.num); // expected-warning {{variable 'a16' is uninitialized when used within its own initialization}}
+ A a17(a17.get2()); // expected-warning {{variable 'a17' is uninitialized when used within its own initialization}}
+}
+
+struct B {
+ // POD struct.
+ int x;
+ int *y;
+};
+
+B getB() { return B(); };
+B getB(int x) { return B(); };
+B getB(int *x) { return B(); };
+B getB(B *b) { return B(); };
+
+void setupB() {
+ B b1;
+ B b2(b1);
+ B b3 = { 5, &b3.x };
+ B b4 = getB();
+ B b5 = getB(&b5);
+ B b6 = getB(&b6.x);
+
+ // Silence unused warning
+ (void) b2;
+ (void) b4;
+
+ B b7(b7); // expected-warning {{variable 'b7' is uninitialized when used within its own initialization}}
+ B b8 = getB(b8.x); // expected-warning {{variable 'b8' is uninitialized when used within its own initialization}}
+ B b9 = getB(b9.y); // expected-warning {{variable 'b9' is uninitialized when used within its own initialization}}
+}
+
+// Also test similar constructs in a field's initializer.
+struct S {
+ int x;
+ void *ptr;
+
+ S(bool (*)[1]) : x(x) {} // expected-warning {{field is uninitialized when used here}}
+ S(bool (*)[2]) : x(x + 1) {} // expected-warning {{field is uninitialized when used here}}
+ S(bool (*)[3]) : x(x + x) {} // expected-warning {{field is uninitialized when used here}}
+ S(bool (*)[4]) : x(static_cast<long>(x) + 1) {} // expected-warning {{field is uninitialized when used here}}
+ S(bool (*)[5]) : x(foo(x)) {} // FIXME: This should warn!
+
+ // These don't actually require the value of x and so shouldn't warn.
+ S(char (*)[1]) : x(sizeof(x)) {} // rdar://8610363
+ S(char (*)[2]) : ptr(&ptr) {}
+ S(char (*)[3]) : x(__alignof__(x)) {}
+ S(char (*)[4]) : x(bar(&x)) {}
+ S(char (*)[5]) : x(boo(x)) {}
+ S(char (*)[6]) : x(far(x)) {}
+};
+
+struct C { char a[100], *e; } car = { .e = car.a };
+
+// <rdar://problem/10398199>
+namespace rdar10398199 {
+ class FooBase { protected: ~FooBase() {} };
+ class Foo : public FooBase {
+ public:
+ operator int&() const;
+ };
+ void stuff();
+ template <typename T> class FooImpl : public Foo {
+ T val;
+ public:
+ FooImpl(const T &x) : val(x) {}
+ ~FooImpl() { stuff(); }
+ };
+
+ template <typename T> FooImpl<T> makeFoo(const T& x) {
+ return FooImpl<T>(x);
+ }
+
+ void test() {
+ const Foo &x = makeFoo(42);
+ const int&y = makeFoo(42u);
+ (void)x;
+ (void)y;
+ };
+}
+
+// PR 12325 - this was a false uninitialized value warning due to
+// a broken CFG.
+int pr12325(int params) {
+ int x = ({
+ while (false)
+ ;
+ int _v = params;
+ if (false)
+ ;
+ _v; // no-warning
+ });
+ return x;
+}
+
+// Test lambda expressions with -Wuninitialized
+int test_lambda() {
+ auto f1 = [] (int x, int y) { int z; return x + y + z; }; // expected-warning {{C++11 requires lambda with omitted result type to consist of a single return statement}} expected-warning{{variable 'z' is uninitialized when used here}} expected-note {{initialize the variable 'z' to silence this warning}}
+ return f1(1, 2);
+}