forked from OSchip/llvm-project
116 lines
3.8 KiB
C
116 lines
3.8 KiB
C
// 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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void test9() {
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const char max_char = 0x7F;
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const short max_short = 0x7FFF;
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const int max_int = 0x7FFFFFFF;
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const short max_char_plus_one = (short)max_char + 1;
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const int max_short_plus_one = (int)max_short + 1;
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const long max_int_plus_one = (long)max_int + 1;
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char new_char = max_char_plus_one; // expected-warning {{implicit conversion from 'const short' to 'char' changes value from 128 to -128}}
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short new_short = max_short_plus_one; // expected-warning {{implicit conversion from 'const int' to 'short' changes value from 32768 to -32768}}
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int new_int = max_int_plus_one; // expected-warning {{implicit conversion from 'const long' to 'int' changes value from 2147483648 to -2147483648}}
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char hex_char = 0x80;
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short hex_short = 0x8000;
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int hex_int = 0x80000000;
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char oct_char = 0200;
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short oct_short = 0100000;
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int oct_int = 020000000000;
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char bin_char = 0b10000000;
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short bin_short = 0b1000000000000000;
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int bin_int = 0b10000000000000000000000000000000;
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#define CHAR_MACRO_HEX 0xff
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char macro_char_hex = CHAR_MACRO_HEX;
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#define CHAR_MACRO_DEC 255
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char macro_char_dec = CHAR_MACRO_DEC; // expected-warning {{implicit conversion from 'int' to 'char' changes value from 255 to -1}}
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char array_init[] = { 255, 127, 128, 129, 0 };
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}
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