derek.holloway
7502bf64a4
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179 lines
7.4 KiB
C++
179 lines
7.4 KiB
C++
// Force x86-64 because some of our heuristics are actually based
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// on integer sizes.
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// RUN: %clang_cc1 -triple x86_64-apple-darwin -fsyntax-only -verify -std=c++11 %s
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namespace RuntimeBehavior {
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// Avoid emitting tautological compare warnings when the code already has
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// compile time checks on variable sizes.
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const int kintmax = 2147483647;
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void test0(short x) {
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if (sizeof(x) < sizeof(int) || x < kintmax) {}
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if (x < kintmax) {}
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// expected-warning@-1{{comparison of constant 2147483647 with expression of type 'short' is always true}}
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}
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void test1(short x) {
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if (x < kintmax) {}
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// expected-warning@-1{{comparison of constant 2147483647 with expression of type 'short' is always true}}
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if (sizeof(x) < sizeof(int))
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return;
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if (x < kintmax) {}
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}
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}
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namespace ArrayCompare {
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#define GetValue(ptr) ((ptr != 0) ? ptr[0] : 0)
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extern int a[] __attribute__((weak));
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int b[] = {8,13,21};
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struct {
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int x[10];
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} c;
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const char str[] = "text";
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void ignore() {
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if (a == 0) {}
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if (a != 0) {}
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(void)GetValue(b);
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}
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void test() {
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if (b == 0) {}
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// expected-warning@-1{{comparison of array 'b' equal to a null pointer is always false}}
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if (b != 0) {}
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// expected-warning@-1{{comparison of array 'b' not equal to a null pointer is always true}}
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if (0 == b) {}
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// expected-warning@-1{{comparison of array 'b' equal to a null pointer is always false}}
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if (0 != b) {}
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// expected-warning@-1{{comparison of array 'b' not equal to a null pointer is always true}}
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if (c.x == 0) {}
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// expected-warning@-1{{comparison of array 'c.x' equal to a null pointer is always false}}
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if (c.x != 0) {}
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// expected-warning@-1{{comparison of array 'c.x' not equal to a null pointer is always true}}
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if (str == 0) {}
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// expected-warning@-1{{comparison of array 'str' equal to a null pointer is always false}}
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if (str != 0) {}
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// expected-warning@-1{{comparison of array 'str' not equal to a null pointer is always true}}
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}
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}
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namespace FunctionCompare {
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#define CallFunction(f) ((f != 0) ? f() : 0)
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extern void a() __attribute__((weak));
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void fun1();
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int fun2();
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int* fun3();
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int* fun4(int);
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class S {
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public:
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static int foo();
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};
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void ignore() {
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if (a == 0) {}
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if (0 != a) {}
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(void)CallFunction(fun2);
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}
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void test() {
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if (fun1 == 0) {}
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// expected-warning@-1{{comparison of function 'fun1' equal to a null pointer is always false}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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if (fun2 == 0) {}
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// expected-warning@-1{{comparison of function 'fun2' equal to a null pointer is always false}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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// expected-note@-3{{suffix with parentheses to turn this into a function call}}
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if (fun3 == 0) {}
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// expected-warning@-1{{comparison of function 'fun3' equal to a null pointer is always false}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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// expected-note@-3{{suffix with parentheses to turn this into a function call}}
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if (fun4 == 0) {}
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// expected-warning@-1{{comparison of function 'fun4' equal to a null pointer is always false}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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if (nullptr != fun1) {}
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// expected-warning@-1{{comparison of function 'fun1' not equal to a null pointer is always true}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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if (nullptr != fun2) {}
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// expected-warning@-1{{comparison of function 'fun2' not equal to a null pointer is always true}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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if (nullptr != fun3) {}
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// expected-warning@-1{{comparison of function 'fun3' not equal to a null pointer is always true}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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// expected-note@-3{{suffix with parentheses to turn this into a function call}}
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if (nullptr != fun4) {}
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// expected-warning@-1{{comparison of function 'fun4' not equal to a null pointer is always true}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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if (S::foo == 0) {}
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// expected-warning@-1{{comparison of function 'S::foo' equal to a null pointer is always false}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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// expected-note@-3{{suffix with parentheses to turn this into a function call}}
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}
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}
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namespace PointerCompare {
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extern int a __attribute__((weak));
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int b;
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static int c;
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class S {
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public:
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static int a;
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int b;
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};
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void ignored() {
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if (&a == 0) {}
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}
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void test() {
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S s;
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if (&b == 0) {}
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// expected-warning@-1{{comparison of address of 'b' equal to a null pointer is always false}}
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if (&c == 0) {}
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// expected-warning@-1{{comparison of address of 'c' equal to a null pointer is always false}}
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if (&s.a == 0) {}
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// expected-warning@-1{{comparison of address of 's.a' equal to a null pointer is always false}}
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if (&s.b == 0) {}
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// expected-warning@-1{{comparison of address of 's.b' equal to a null pointer is always false}}
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if (&S::a == 0) {}
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// expected-warning@-1{{comparison of address of 'S::a' equal to a null pointer is always false}}
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}
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}
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namespace macros {
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#define assert(x) if (x) {}
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int array[5];
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void fun();
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int x;
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void test() {
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assert(array == 0);
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// expected-warning@-1{{comparison of array 'array' equal to a null pointer is always false}}
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assert(array != 0);
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// expected-warning@-1{{comparison of array 'array' not equal to a null pointer is always true}}
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assert(array == 0 && "expecting null pointer");
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// expected-warning@-1{{comparison of array 'array' equal to a null pointer is always false}}
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assert(array != 0 && "expecting non-null pointer");
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// expected-warning@-1{{comparison of array 'array' not equal to a null pointer is always true}}
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assert(fun == 0);
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// expected-warning@-1{{comparison of function 'fun' equal to a null pointer is always false}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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assert(fun != 0);
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// expected-warning@-1{{comparison of function 'fun' not equal to a null pointer is always true}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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assert(fun == 0 && "expecting null pointer");
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// expected-warning@-1{{comparison of function 'fun' equal to a null pointer is always false}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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assert(fun != 0 && "expecting non-null pointer");
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// expected-warning@-1{{comparison of function 'fun' not equal to a null pointer is always true}}
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// expected-note@-2{{prefix with the address-of operator to silence this warning}}
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assert(&x == 0);
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// expected-warning@-1{{comparison of address of 'x' equal to a null pointer is always false}}
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assert(&x != 0);
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// expected-warning@-1{{comparison of address of 'x' not equal to a null pointer is always true}}
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assert(&x == 0 && "expecting null pointer");
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// expected-warning@-1{{comparison of address of 'x' equal to a null pointer is always false}}
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assert(&x != 0 && "expecting non-null pointer");
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// expected-warning@-1{{comparison of address of 'x' not equal to a null pointer is always true}}
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}
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}
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