forked from OSchip/llvm-project
426 lines
17 KiB
C++
426 lines
17 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -Wall -Wuninitialized -Wno-unused-value -std=c++11 -verify %s
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int foo(int x);
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int bar(int* x);
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int boo(int& x);
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int far(const int& x);
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// Test self-references within initializers which are guaranteed to be
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// uninitialized.
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int a = a; // no-warning: used to signal intended lack of initialization.
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int b = b + 1; // expected-warning {{variable 'b' is uninitialized when used within its own initialization}}
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int c = (c + c); // expected-warning 2 {{variable 'c' is uninitialized when used within its own initialization}}
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int e = static_cast<long>(e) + 1; // expected-warning {{variable 'e' is uninitialized when used within its own initialization}}
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int f = foo(f); // expected-warning {{variable 'f' is uninitialized when used within its own initialization}}
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// Thes don't warn as they don't require the value.
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int g = sizeof(g);
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void* ptr = &ptr;
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int h = bar(&h);
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int i = boo(i);
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int j = far(j);
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int k = __alignof__(k);
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int l = k ? l : l; // expected-warning 2{{variable 'l' is uninitialized when used within its own initialization}}
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int m = 1 + (k ? m : m); // expected-warning 2{{variable 'm' is uninitialized when used within its own initialization}}
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int n = -n; // expected-warning {{variable 'n' is uninitialized when used within its own initialization}}
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void test_stuff () {
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int a = a; // no-warning: used to signal intended lack of initialization.
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int b = b + 1; // expected-warning {{variable 'b' is uninitialized when used within its own initialization}}
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int c = (c + c); // expected-warning {{variable 'c' is uninitialized when used within its own initialization}}
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int d = ({ d + d ;}); // expected-warning {{variable 'd' is uninitialized when used within its own initialization}}
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int e = static_cast<long>(e) + 1; // expected-warning {{variable 'e' is uninitialized when used within its own initialization}}
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int f = foo(f); // expected-warning {{variable 'f' is uninitialized when used within its own initialization}}
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// Thes don't warn as they don't require the value.
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int g = sizeof(g);
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void* ptr = &ptr;
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int h = bar(&h);
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int i = boo(i);
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int j = far(j);
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int k = __alignof__(k);
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int l = k ? l : l; // FIXME: warn here
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int m = 1 + (k ? m : m); // FIXME: warn here
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int n = -n; // expected-warning {{variable 'n' is uninitialized when used within its own initialization}}
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for (;;) {
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int a = a; // no-warning: used to signal intended lack of initialization.
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int b = b + 1; // expected-warning {{variable 'b' is uninitialized when used within its own initialization}}
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int c = (c + c); // expected-warning {{variable 'c' is uninitialized when used within its own initialization}}
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int d = ({ d + d ;}); // expected-warning {{variable 'd' is uninitialized when used within its own initialization}}
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int e = static_cast<long>(e) + 1; // expected-warning {{variable 'e' is uninitialized when used within its own initialization}}
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int f = foo(f); // expected-warning {{variable 'f' is uninitialized when used within its own initialization}}
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// Thes don't warn as they don't require the value.
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int g = sizeof(g);
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void* ptr = &ptr;
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int h = bar(&h);
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int i = boo(i);
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int j = far(j);
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int k = __alignof__(k);
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int l = k ? l : l; // FIXME: warn here
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int m = 1 + (k ? m : m); // FIXME: warn here
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int n = -n; // expected-warning {{variable 'n' is uninitialized when used within its own initialization}}
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}
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}
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// Test self-references with record types.
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class A {
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// Non-POD class.
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public:
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enum count { ONE, TWO, THREE };
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int num;
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static int count;
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int get() const { return num; }
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int get2() { return num; }
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void set(int x) { num = x; }
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static int zero() { return 0; }
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A() {}
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A(A const &a) {}
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A(int x) {}
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A(int *x) {}
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A(A *a) {}
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~A();
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};
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A getA() { return A(); }
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A getA(int x) { return A(); }
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A getA(A* a) { return A(); }
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A getA(A a) { return A(); }
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void setupA(bool x) {
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A a1;
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a1.set(a1.get());
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A a2(a1.get());
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A a3(a1);
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A a4(&a4);
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A a5(a5.zero());
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A a6(a6.ONE);
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A a7 = getA();
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A a8 = getA(a8.TWO);
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A a9 = getA(&a9);
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A a10(a10.count);
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A a11(a11); // expected-warning {{variable 'a11' is uninitialized when used within its own initialization}}
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A a12(a12.get()); // expected-warning {{variable 'a12' is uninitialized when used within its own initialization}}
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A a13(a13.num); // expected-warning {{variable 'a13' is uninitialized when used within its own initialization}}
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A a14 = A(a14); // expected-warning {{variable 'a14' is uninitialized when used within its own initialization}}
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A a15 = getA(a15.num); // expected-warning {{variable 'a15' is uninitialized when used within its own initialization}}
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A a16(&a16.num); // expected-warning {{variable 'a16' is uninitialized when used within its own initialization}}
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A a17(a17.get2()); // expected-warning {{variable 'a17' is uninitialized when used within its own initialization}}
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A a18 = x ? a18 : a17; // expected-warning {{variable 'a18' is uninitialized when used within its own initialization}}
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A a19 = getA(x ? a19 : a17); // expected-warning {{variable 'a19' is uninitialized when used within its own initialization}}
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}
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bool x;
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A a1;
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A a2(a1.get());
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A a3(a1);
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A a4(&a4);
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A a5(a5.zero());
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A a6(a6.ONE);
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A a7 = getA();
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A a8 = getA(a8.TWO);
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A a9 = getA(&a9);
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A a10(a10.count);
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A a11(a11); // expected-warning {{variable 'a11' is uninitialized when used within its own initialization}}
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A a12(a12.get()); // expected-warning {{variable 'a12' is uninitialized when used within its own initialization}}
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A a13(a13.num); // expected-warning {{variable 'a13' is uninitialized when used within its own initialization}}
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A a14 = A(a14); // expected-warning {{variable 'a14' is uninitialized when used within its own initialization}}
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A a15 = getA(a15.num); // expected-warning {{variable 'a15' is uninitialized when used within its own initialization}}
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A a16(&a16.num); // expected-warning {{variable 'a16' is uninitialized when used within its own initialization}}
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A a17(a17.get2()); // expected-warning {{variable 'a17' is uninitialized when used within its own initialization}}
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A a18 = x ? a18 : a17; // expected-warning {{variable 'a18' is uninitialized when used within its own initialization}}
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A a19 = getA(x ? a19 : a17); // expected-warning {{variable 'a19' is uninitialized when used within its own initialization}}
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struct B {
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// POD struct.
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int x;
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int *y;
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};
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B getB() { return B(); };
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B getB(int x) { return B(); };
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B getB(int *x) { return B(); };
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B getB(B *b) { return B(); };
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void setupB() {
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B b1;
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B b2(b1);
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B b3 = { 5, &b3.x };
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B b4 = getB();
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B b5 = getB(&b5);
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B b6 = getB(&b6.x);
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// Silence unused warning
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(void) b2;
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(void) b4;
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B b7(b7); // expected-warning {{variable 'b7' is uninitialized when used within its own initialization}}
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B b8 = getB(b8.x); // expected-warning {{variable 'b8' is uninitialized when used within its own initialization}}
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B b9 = getB(b9.y); // expected-warning {{variable 'b9' is uninitialized when used within its own initialization}}
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B b10 = getB(-b10.x); // expected-warning {{variable 'b10' is uninitialized when used within its own initialization}}
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}
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// Also test similar constructs in a field's initializer.
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struct S {
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int x;
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void *ptr;
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S(bool (*)[1]) : x(x) {} // expected-warning {{field is uninitialized when used here}}
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S(bool (*)[2]) : x(x + 1) {} // expected-warning {{field is uninitialized when used here}}
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S(bool (*)[3]) : x(x + x) {} // expected-warning 2{{field is uninitialized when used here}}
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S(bool (*)[4]) : x(static_cast<long>(x) + 1) {} // expected-warning {{field is uninitialized when used here}}
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S(bool (*)[5]) : x(foo(x)) {} // expected-warning {{field is uninitialized when used here}}
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// These don't actually require the value of x and so shouldn't warn.
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S(char (*)[1]) : x(sizeof(x)) {} // rdar://8610363
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S(char (*)[2]) : ptr(&ptr) {}
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S(char (*)[3]) : x(__alignof__(x)) {}
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S(char (*)[4]) : x(bar(&x)) {}
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S(char (*)[5]) : x(boo(x)) {}
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S(char (*)[6]) : x(far(x)) {}
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};
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struct C { char a[100], *e; } car = { .e = car.a };
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// <rdar://problem/10398199>
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namespace rdar10398199 {
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class FooBase { protected: ~FooBase() {} };
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class Foo : public FooBase {
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public:
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operator int&() const;
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};
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void stuff();
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template <typename T> class FooImpl : public Foo {
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T val;
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public:
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FooImpl(const T &x) : val(x) {}
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~FooImpl() { stuff(); }
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};
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template <typename T> FooImpl<T> makeFoo(const T& x) {
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return FooImpl<T>(x);
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}
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void test() {
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const Foo &x = makeFoo(42);
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const int&y = makeFoo(42u);
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(void)x;
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(void)y;
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};
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}
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// PR 12325 - this was a false uninitialized value warning due to
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// a broken CFG.
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int pr12325(int params) {
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int x = ({
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while (false)
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;
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int _v = params;
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if (false)
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;
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_v; // no-warning
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});
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return x;
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}
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// Test lambda expressions with -Wuninitialized
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int test_lambda() {
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auto f1 = [] (int x, int y) { int z; return x + y + z; }; // expected-warning{{variable 'z' is uninitialized when used here}} expected-note {{initialize the variable 'z' to silence this warning}}
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return f1(1, 2);
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}
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namespace {
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struct A {
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enum { A1 };
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static int A2() {return 5;}
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int A3;
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int A4() { return 5;}
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};
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struct B {
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A a;
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};
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struct C {
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C() {}
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C(int x) {}
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static A a;
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B b;
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};
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A C::a = A();
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// Accessing non-static members will give a warning.
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struct D {
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C c;
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D(char (*)[1]) : c(c.b.a.A1) {}
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D(char (*)[2]) : c(c.b.a.A2()) {}
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D(char (*)[3]) : c(c.b.a.A3) {} // expected-warning {{field is uninitialized when used here}}
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D(char (*)[4]) : c(c.b.a.A4()) {} // expected-warning {{field is uninitialized when used here}}
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// c::a is static, so it is already initialized
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D(char (*)[5]) : c(c.a.A1) {}
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D(char (*)[6]) : c(c.a.A2()) {}
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D(char (*)[7]) : c(c.a.A3) {}
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D(char (*)[8]) : c(c.a.A4()) {}
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};
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struct E {
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int a, b, c;
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E(char (*)[1]) : a(a ? b : c) {} // expected-warning {{field is uninitialized when used here}}
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E(char (*)[2]) : a(b ? a : a) {} // expected-warning 2{{field is uninitialized when used here}}
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E(char (*)[3]) : a(b ? (a) : c) {} // expected-warning {{field is uninitialized when used here}}
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E(char (*)[4]) : a(b ? c : (a+c)) {} // expected-warning {{field is uninitialized when used here}}
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E(char (*)[5]) : a(b ? c : b) {}
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E(char (*)[6]) : a(a ?: a) {} // expected-warning 2{{field is uninitialized when used here}}
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E(char (*)[7]) : a(b ?: a) {} // expected-warning {{field is uninitialized when used here}}
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E(char (*)[8]) : a(a ?: c) {} // expected-warning {{field is uninitialized when used here}}
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E(char (*)[9]) : a(b ?: c) {}
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E(char (*)[10]) : a((a, a, b)) {}
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E(char (*)[11]) : a((c + a, a + 1, b)) {} // expected-warning 2{{field is uninitialized when used here}}
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E(char (*)[12]) : a((b + c, c, a)) {} // expected-warning {{field is uninitialized when used here}}
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E(char (*)[13]) : a((a, a, a, a)) {} // expected-warning {{field is uninitialized when used here}}
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E(char (*)[14]) : a((b, c, c)) {}
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};
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struct F {
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int a;
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F* f;
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F(int) {}
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F() {}
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};
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int F::*ptr = &F::a;
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F* F::*f_ptr = &F::f;
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struct G {
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F f1, f2;
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F *f3, *f4;
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G(char (*)[1]) : f1(f1) {} // expected-warning {{field is uninitialized when used here}}
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G(char (*)[2]) : f2(f1) {}
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G(char (*)[3]) : f2(F()) {}
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G(char (*)[4]) : f1(f1.*ptr) {} // expected-warning {{field is uninitialized when used here}}
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G(char (*)[5]) : f2(f1.*ptr) {}
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G(char (*)[6]) : f3(f3) {} // expected-warning {{field is uninitialized when used here}}
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G(char (*)[7]) : f3(f3->*f_ptr) {} // expected-warning {{field is uninitialized when used here}}
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G(char (*)[8]) : f3(new F(f3->*ptr)) {} // expected-warning {{field is uninitialized when used here}}
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};
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}
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namespace statics {
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static int a = a; // no-warning: used to signal intended lack of initialization.
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static int b = b + 1; // expected-warning {{variable 'b' is uninitialized when used within its own initialization}}
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static int c = (c + c); // expected-warning 2{{variable 'c' is uninitialized when used within its own initialization}}
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static int e = static_cast<long>(e) + 1; // expected-warning {{variable 'e' is uninitialized when used within its own initialization}}
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static int f = foo(f); // expected-warning {{variable 'f' is uninitialized when used within its own initialization}}
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// Thes don't warn as they don't require the value.
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static int g = sizeof(g);
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int gg = g; // Silence unneeded warning
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static void* ptr = &ptr;
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static int h = bar(&h);
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static int i = boo(i);
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static int j = far(j);
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static int k = __alignof__(k);
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static int l = k ? l : l; // expected-warning 2{{variable 'l' is uninitialized when used within its own initialization}}
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static int m = 1 + (k ? m : m); // expected-warning 2{{variable 'm' is uninitialized when used within its own initialization}}
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static int n = -n; // expected-warning {{variable 'n' is uninitialized when used within its own initialization}}
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void test() {
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static int a = a; // no-warning: used to signal intended lack of initialization.
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static int b = b + 1; // expected-warning {{variable 'b' is uninitialized when used within its own initialization}}
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static int c = (c + c); // expected-warning 2{{variable 'c' is uninitialized when used within its own initialization}}
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static int d = ({ d + d ;}); // expected-warning 2{{variable 'd' is uninitialized when used within its own initialization}}
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static int e = static_cast<long>(e) + 1; // expected-warning {{variable 'e' is uninitialized when used within its own initialization}}
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static int f = foo(f); // expected-warning {{variable 'f' is uninitialized when used within its own initialization}}
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// Thes don't warn as they don't require the value.
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static int g = sizeof(g);
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static void* ptr = &ptr;
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static int h = bar(&h);
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static int i = boo(i);
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static int j = far(j);
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static int k = __alignof__(k);
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static int l = k ? l : l; // expected-warning 2{{variable 'l' is uninitialized when used within its own initialization}}
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static int m = 1 + (k ? m : m); // expected-warning 2{{variable 'm' is uninitialized when used within its own initialization}}
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static int n = -n; // expected-warning {{variable 'n' is uninitialized when used within its own initialization}}
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for (;;) {
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static int a = a; // no-warning: used to signal intended lack of initialization.
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static int b = b + 1; // expected-warning {{variable 'b' is uninitialized when used within its own initialization}}
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static int c = (c + c); // expected-warning 2{{variable 'c' is uninitialized when used within its own initialization}}
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static int d = ({ d + d ;}); // expected-warning 2{{variable 'd' is uninitialized when used within its own initialization}}
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static int e = static_cast<long>(e) + 1; // expected-warning {{variable 'e' is uninitialized when used within its own initialization}}
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static int f = foo(f); // expected-warning {{variable 'f' is uninitialized when used within its own initialization}}
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// Thes don't warn as they don't require the value.
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static int g = sizeof(g);
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static void* ptr = &ptr;
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static int h = bar(&h);
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static int i = boo(i);
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static int j = far(j);
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static int k = __alignof__(k);
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static int l = k ? l : l; // expected-warning 2{{variable 'l' is uninitialized when used within its own initialization}}
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static int m = 1 + (k ? m : m); // expected-warning 2{{variable 'm' is uninitialized when used within its own initialization}}
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static int n = -n; // expected-warning {{variable 'n' is uninitialized when used within its own initialization}}
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}
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}
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}
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namespace in_class_initializers {
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struct S {
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S() : a(a + 1) {} // expected-warning{{field is uninitialized when used here}}
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int a = 42; // Note: because a is in a member initializer list, this initialization is ignored.
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};
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struct T {
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T() : b(a + 1) {} // No-warning.
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int a = 42;
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int b;
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};
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struct U {
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U() : a(b + 1), b(a + 1) {} // FIXME: Warn here.
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int a = 42; // Note: because a and b are in the member initializer list, these initializers are ignored.
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int b = 1;
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};
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}
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namespace references {
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int &a = a; // expected-warning{{reference 'a' is not yet bound to a value when used within its own initialization}}
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struct S {
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S() : a(a) {} // expected-warning{{reference is not yet bound to a value when used here}}
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int &a;
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};
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void f() {
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int &a = a; // expected-warning{{reference 'a' is not yet bound to a value when used within its own initialization}}
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}
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struct T {
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T() : a(b), b(a) {} // FIXME: Warn here.
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int &a, &b;
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int &c = c; // expected-warning{{reference is not yet bound to a value when used here}}
|
|
};
|
|
|
|
int x;
|
|
struct U {
|
|
U() : b(a) {} // No-warning.
|
|
int &a = x;
|
|
int &b;
|
|
};
|
|
}
|