89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify %s
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int foo(int x) {
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return x == x; // expected-warning {{self-comparison always evaluates to true}}
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}
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int foo2(int x) {
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return (x) != (((x))); // expected-warning {{self-comparison always evaluates to false}}
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}
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void foo3(short s, short t) {
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if (s == s) {} // expected-warning {{self-comparison always evaluates to true}}
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if (s == t) {} // no-warning
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}
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void foo4(void* v, void* w) {
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if (v == v) {} // expected-warning {{self-comparison always evaluates to true}}
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if (v == w) {} // no-warning
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}
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int qux(int x) {
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return x < x; // expected-warning {{self-comparison}}
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}
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int qux2(int x) {
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return x > x; // expected-warning {{self-comparison}}
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}
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int bar(float x) {
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return x == x; // no-warning
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}
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int bar2(float x) {
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return x != x; // no-warning
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}
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#define IS_THE_ANSWER(x) (x == 42)
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int macro_comparison() {
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return IS_THE_ANSWER(42);
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}
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// Don't complain in unevaluated contexts.
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int compare_sizeof(int x) {
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return sizeof(x == x); // no-warning
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}
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int array_comparisons() {
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int array1[2];
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int array2[2];
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//
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// compare same array
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//
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return array1 == array1; // expected-warning{{self-comparison always evaluates to true}}
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return array1 != array1; // expected-warning{{self-comparison always evaluates to false}}
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return array1 < array1; // expected-warning{{self-comparison always evaluates to false}}
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return array1 <= array1; // expected-warning{{self-comparison always evaluates to true}}
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return array1 > array1; // expected-warning{{self-comparison always evaluates to false}}
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return array1 >= array1; // expected-warning{{self-comparison always evaluates to true}}
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//
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// compare differrent arrays
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//
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return array1 == array2; // expected-warning{{array comparison always evaluates to false}}
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return array1 != array2; // expected-warning{{array comparison always evaluates to true}}
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//
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// we don't know what these are going to be
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//
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return array1 < array2; // expected-warning{{array comparison always evaluates to a constant}}
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return array1 <= array2; // expected-warning{{array comparison always evaluates to a constant}}
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return array1 > array2; // expected-warning{{array comparison always evaluates to a constant}}
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return array1 >= array2; // expected-warning{{array comparison always evaluates to a constant}}
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}
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// Don't issue a warning when either the left or right side of the comparison
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// results from a macro expansion. <rdar://problem/8435950>
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#define R8435950_A i
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#define R8435950_B i
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int R8435950(int i) {
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if (R8435950_A == R8435950_B) // no-warning
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return 0;
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return 1;
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}
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