68 lines
2 KiB
C
68 lines
2 KiB
C
// RUN: %clang -Wall -Wshift-sign-overflow -ffreestanding -fsyntax-only -Xclang -verify %s
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#include <limits.h>
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#define WORD_BIT (sizeof(int) * CHAR_BIT)
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enum {
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X = 1 << 0,
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Y = 1 << 1,
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Z = 1 << 2
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};
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void test() {
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char c;
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c = 0 << 0;
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c = 0 << 1;
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c = 1 << 0;
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c = 1 << -0;
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c = 1 >> -0;
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c = 1 << -1; // expected-warning {{shift count is negative}}
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c = 1 >> -1; // expected-warning {{shift count is negative}}
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c = 1 << c;
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c <<= 0;
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c >>= 0;
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c <<= 1;
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c >>= 1;
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c <<= -1; // expected-warning {{shift count is negative}}
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c >>= -1; // expected-warning {{shift count is negative}}
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c <<= 999999; // expected-warning {{shift count >= width of type}}
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c >>= 999999; // expected-warning {{shift count >= width of type}}
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c <<= CHAR_BIT; // expected-warning {{shift count >= width of type}}
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c >>= CHAR_BIT; // expected-warning {{shift count >= width of type}}
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c <<= CHAR_BIT+1; // expected-warning {{shift count >= width of type}}
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c >>= CHAR_BIT+1; // expected-warning {{shift count >= width of type}}
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(void)((long)c << CHAR_BIT);
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int i;
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i = 1 << (WORD_BIT - 2);
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i = 2 << (WORD_BIT - 1); // expected-warning {{bits to represent, but 'int' only has}}
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i = 1 << (WORD_BIT - 1); // expected-warning {{sets the sign bit of the shift expression}}
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i = -1 << (WORD_BIT - 1);
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i = 0 << (WORD_BIT - 1);
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i = (char)1 << (WORD_BIT - 2);
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unsigned u;
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u = 1U << (WORD_BIT - 1);
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u = 5U << (WORD_BIT - 1);
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long long int lli;
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lli = INT_MIN << 2; // expected-warning {{bits to represent, but 'int' only has}}
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lli = 1LL << (sizeof(long long) * CHAR_BIT - 2);
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}
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#define a 0
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#define ashift 8
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enum { b = (a << ashift) };
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// Don't warn for negative shifts in code that is unreachable.
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void test_pr5544() {
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(void) (((1) > 63 && (1) < 128 ? (((unsigned long long) 1)<<((1)-64)) : (unsigned long long) 0)); // no-warning
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}
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void test_shift_too_much(char x) {
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if (0)
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(void) (x >> 80); // no-warning
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(void) (x >> 80); // expected-warning {{shift count >= width of type}}
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}
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