83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
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// RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-apple-darwin %s
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// This file tests -Wconstant-conversion, a subcategory of -Wconversion
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// which is on by default.
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// rdar://problem/6792488
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void test_6792488(void) {
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int x = 0x3ff0000000000000U; // expected-warning {{implicit conversion from 'unsigned long' to 'int' changes value from 4607182418800017408 to 0}}
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}
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void test_7809123(void) {
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struct { int i5 : 5; } a;
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a.i5 = 36; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 36 to 4}}
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}
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void test() {
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struct { int bit : 1; } a;
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a.bit = 1; // shouldn't warn
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}
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enum Test2 { K_zero, K_one };
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enum Test2 test2(enum Test2 *t) {
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*t = 20;
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return 10; // shouldn't warn
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}
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void test3() {
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struct A {
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unsigned int foo : 2;
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int bar : 2;
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};
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struct A a = { 0, 10 }; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to -2}}
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struct A b[] = { 0, 10, 0, 0 }; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to -2}}
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struct A c[] = {{10, 0}}; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}}
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struct A d = (struct A) { 10, 0 }; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}}
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struct A e = { .foo = 10 }; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}}
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}
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void test4() {
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struct A {
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char c : 2;
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} a;
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a.c = 0x101; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 257 to 1}}
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}
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void test5() {
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struct A {
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_Bool b : 1;
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} a;
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// Don't warn about this implicit conversion to bool, or at least
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// don't warn about it just because it's a bitfield.
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a.b = 100;
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}
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void test6() {
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// Test that unreachable code doesn't trigger the truncation warning.
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unsigned char x = 0 ? 65535 : 1; // no-warning
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unsigned char y = 1 ? 65535 : 1; // expected-warning {{changes value}}
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}
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void test7() {
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struct {
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unsigned int twoBits1:2;
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unsigned int twoBits2:2;
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unsigned int reserved:28;
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} f;
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f.twoBits1 = ~1; // expected-warning {{implicit truncation from 'int' to bitfield changes value from -2 to 2}}
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f.twoBits2 = ~2; // expected-warning {{implicit truncation from 'int' to bitfield changes value from -3 to 1}}
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f.twoBits1 &= ~1; // no-warning
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f.twoBits2 &= ~2; // no-warning
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}
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void test8() {
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enum E { A, B, C };
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struct { enum E x : 1; } f;
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f.x = C; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 2 to 0}}
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}
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