342 lines
14 KiB
C
342 lines
14 KiB
C
// RUN: %clang_cc1 -triple x86_64-apple-darwin -fsyntax-only -pedantic -verify -Wsign-compare %s -Wno-unreachable-code
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int test(char *C) { // nothing here should warn.
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return C != ((void*)0);
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return C != (void*)0;
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return C != 0;
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return C != 1; // expected-warning {{comparison between pointer and integer ('char *' and 'int')}}
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}
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int ints(long a, unsigned long b) {
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enum EnumA {A};
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enum EnumB {B};
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enum EnumC {C = 0x10000};
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return
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// (a,b)
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(a == (unsigned long) b) + // expected-warning {{comparison of integers of different signs}}
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(a == (unsigned int) b) +
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(a == (unsigned short) b) +
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(a == (unsigned char) b) +
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((long) a == b) + // expected-warning {{comparison of integers of different signs}}
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((int) a == b) + // expected-warning {{comparison of integers of different signs}}
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((short) a == b) + // expected-warning {{comparison of integers of different signs}}
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((signed char) a == b) + // expected-warning {{comparison of integers of different signs}}
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((long) a == (unsigned long) b) + // expected-warning {{comparison of integers of different signs}}
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((int) a == (unsigned int) b) + // expected-warning {{comparison of integers of different signs}}
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((short) a == (unsigned short) b) +
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((signed char) a == (unsigned char) b) +
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(a < (unsigned long) b) + // expected-warning {{comparison of integers of different signs}}
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(a < (unsigned int) b) +
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(a < (unsigned short) b) +
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(a < (unsigned char) b) +
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((long) a < b) + // expected-warning {{comparison of integers of different signs}}
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((int) a < b) + // expected-warning {{comparison of integers of different signs}}
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((short) a < b) + // expected-warning {{comparison of integers of different signs}}
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((signed char) a < b) + // expected-warning {{comparison of integers of different signs}}
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((long) a < (unsigned long) b) + // expected-warning {{comparison of integers of different signs}}
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((int) a < (unsigned int) b) + // expected-warning {{comparison of integers of different signs}}
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((short) a < (unsigned short) b) +
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((signed char) a < (unsigned char) b) +
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// (A,b)
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(A == (unsigned long) b) +
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(A == (unsigned int) b) +
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(A == (unsigned short) b) +
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(A == (unsigned char) b) +
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((long) A == b) +
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((int) A == b) +
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((short) A == b) +
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((signed char) A == b) +
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((long) A == (unsigned long) b) +
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((int) A == (unsigned int) b) +
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((short) A == (unsigned short) b) +
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((signed char) A == (unsigned char) b) +
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(A < (unsigned long) b) +
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(A < (unsigned int) b) +
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(A < (unsigned short) b) +
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(A < (unsigned char) b) +
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((long) A < b) +
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((int) A < b) +
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((short) A < b) +
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((signed char) A < b) +
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((long) A < (unsigned long) b) +
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((int) A < (unsigned int) b) +
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((short) A < (unsigned short) b) +
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((signed char) A < (unsigned char) b) +
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// (a,B)
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(a == (unsigned long) B) +
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(a == (unsigned int) B) +
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(a == (unsigned short) B) +
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(a == (unsigned char) B) +
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((long) a == B) +
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((int) a == B) +
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((short) a == B) +
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((signed char) a == B) +
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((long) a == (unsigned long) B) +
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((int) a == (unsigned int) B) +
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((short) a == (unsigned short) B) +
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((signed char) a == (unsigned char) B) +
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(a < (unsigned long) B) + // expected-warning {{comparison of integers of different signs}}
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(a < (unsigned int) B) +
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(a < (unsigned short) B) +
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(a < (unsigned char) B) +
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((long) a < B) +
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((int) a < B) +
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((short) a < B) +
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((signed char) a < B) +
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((long) a < (unsigned long) B) + // expected-warning {{comparison of integers of different signs}}
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((int) a < (unsigned int) B) + // expected-warning {{comparison of integers of different signs}}
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((short) a < (unsigned short) B) +
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((signed char) a < (unsigned char) B) +
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// (C,b)
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(C == (unsigned long) b) +
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(C == (unsigned int) b) +
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(C == (unsigned short) b) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'unsigned short' is always false}}
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(C == (unsigned char) b) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'unsigned char' is always false}}
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((long) C == b) +
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((int) C == b) +
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((short) C == b) +
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((signed char) C == b) +
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((long) C == (unsigned long) b) +
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((int) C == (unsigned int) b) +
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((short) C == (unsigned short) b) +
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((signed char) C == (unsigned char) b) +
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(C < (unsigned long) b) +
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(C < (unsigned int) b) +
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(C < (unsigned short) b) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'unsigned short' is always false}}
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(C < (unsigned char) b) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'unsigned char' is always false}}
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((long) C < b) +
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((int) C < b) +
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((short) C < b) +
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((signed char) C < b) +
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((long) C < (unsigned long) b) +
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((int) C < (unsigned int) b) +
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((short) C < (unsigned short) b) +
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((signed char) C < (unsigned char) b) +
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// (a,C)
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(a == (unsigned long) C) +
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(a == (unsigned int) C) +
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(a == (unsigned short) C) +
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(a == (unsigned char) C) +
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((long) a == C) +
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((int) a == C) +
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((short) a == C) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'short' is always false}}
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((signed char) a == C) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'signed char' is always false}}
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((long) a == (unsigned long) C) +
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((int) a == (unsigned int) C) +
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((short) a == (unsigned short) C) +
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((signed char) a == (unsigned char) C) +
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(a < (unsigned long) C) + // expected-warning {{comparison of integers of different signs}}
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(a < (unsigned int) C) +
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(a < (unsigned short) C) +
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(a < (unsigned char) C) +
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((long) a < C) +
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((int) a < C) +
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((short) a < C) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'short' is always true}}
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((signed char) a < C) + // expected-warning {{comparison of constant 'C' (65536) with expression of type 'signed char' is always true}}
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((long) a < (unsigned long) C) + // expected-warning {{comparison of integers of different signs}}
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((int) a < (unsigned int) C) + // expected-warning {{comparison of integers of different signs}}
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((short) a < (unsigned short) C) +
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((signed char) a < (unsigned char) C) +
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// (0x80000,b)
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(0x80000 == (unsigned long) b) +
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(0x80000 == (unsigned int) b) +
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(0x80000 == (unsigned short) b) + // expected-warning {{comparison of constant 524288 with expression of type 'unsigned short' is always false}}
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(0x80000 == (unsigned char) b) + // expected-warning {{comparison of constant 524288 with expression of type 'unsigned char' is always false}}
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((long) 0x80000 == b) +
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((int) 0x80000 == b) +
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((short) 0x80000 == b) +
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((signed char) 0x80000 == b) +
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((long) 0x80000 == (unsigned long) b) +
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((int) 0x80000 == (unsigned int) b) +
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((short) 0x80000 == (unsigned short) b) +
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((signed char) 0x80000 == (unsigned char) b) +
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(0x80000 < (unsigned long) b) +
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(0x80000 < (unsigned int) b) +
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(0x80000 < (unsigned short) b) + // expected-warning {{comparison of constant 524288 with expression of type 'unsigned short' is always false}}
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(0x80000 < (unsigned char) b) + // expected-warning {{comparison of constant 524288 with expression of type 'unsigned char' is always false}}
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((long) 0x80000 < b) +
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((int) 0x80000 < b) +
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((short) 0x80000 < b) +
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((signed char) 0x80000 < b) +
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((long) 0x80000 < (unsigned long) b) +
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((int) 0x80000 < (unsigned int) b) +
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((short) 0x80000 < (unsigned short) b) +
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((signed char) 0x80000 < (unsigned char) b) +
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// (a,0x80000)
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(a == (unsigned long) 0x80000) +
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(a == (unsigned int) 0x80000) +
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(a == (unsigned short) 0x80000) +
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(a == (unsigned char) 0x80000) +
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((long) a == 0x80000) +
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((int) a == 0x80000) +
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((short) a == 0x80000) + // expected-warning {{comparison of constant 524288 with expression of type 'short' is always false}}
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((signed char) a == 0x80000) + // expected-warning {{comparison of constant 524288 with expression of type 'signed char' is always false}}
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((long) a == (unsigned long) 0x80000) +
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((int) a == (unsigned int) 0x80000) +
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((short) a == (unsigned short) 0x80000) +
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((signed char) a == (unsigned char) 0x80000) +
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(a < (unsigned long) 0x80000) + // expected-warning {{comparison of integers of different signs}}
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(a < (unsigned int) 0x80000) +
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(a < (unsigned short) 0x80000) +
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(a < (unsigned char) 0x80000) +
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((long) a < 0x80000) +
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((int) a < 0x80000) +
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((short) a < 0x80000) + // expected-warning {{comparison of constant 524288 with expression of type 'short' is always true}}
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((signed char) a < 0x80000) + // expected-warning {{comparison of constant 524288 with expression of type 'signed char' is always true}}
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((long) a < (unsigned long) 0x80000) + // expected-warning {{comparison of integers of different signs}}
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((int) a < (unsigned int) 0x80000) + // expected-warning {{comparison of integers of different signs}}
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((short) a < (unsigned short) 0x80000) +
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((signed char) a < (unsigned char) 0x80000) +
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// We should be able to avoid warning about this.
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(b != (a < 4 ? 1 : 2)) +
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10
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;
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}
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int equal(char *a, const char *b) {
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return a == b;
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}
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int arrays(char (*a)[5], char(*b)[10], char(*c)[5]) {
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int d = (a == c);
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return a == b; // expected-warning {{comparison of distinct pointer types}}
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}
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int pointers(int *a) {
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return a > 0; // expected-warning {{ordered comparison between pointer and zero ('int *' and 'int') is an extension}}
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return a > 42; // expected-warning {{ordered comparison between pointer and integer ('int *' and 'int')}}
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return a > (void *)0; // expected-warning {{comparison of distinct pointer types}}
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}
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int function_pointers(int (*a)(int), int (*b)(int), void (*c)(int)) {
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return a > b; // expected-warning {{ordered comparison of function pointers}}
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return function_pointers > function_pointers; // expected-warning {{self-comparison always evaluates to false}} expected-warning{{ordered comparison of function pointers}}
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return a > c; // expected-warning {{comparison of distinct pointer types}}
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return a == (void *) 0;
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return a == (void *) 1; // expected-warning {{equality comparison between function pointer and void pointer}}
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}
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int void_pointers(void* foo) {
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return foo == (void*) 0;
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return foo == (void*) 1;
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}
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int test1(int i) {
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enum en { zero };
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return i > zero;
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}
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// PR5937
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int test2(int i32) {
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struct foo {
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unsigned int u8 : 8;
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unsigned long long u31 : 31;
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unsigned long long u32 : 32;
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unsigned long long u63 : 63;
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unsigned long long u64 : 64;
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} *x;
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if (x->u8 == i32) { // comparison in int32, exact
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return 0;
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} else if (x->u31 == i32) { // comparison in int32, exact
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return 1;
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} else if (x->u32 == i32) { // expected-warning {{comparison of integers of different signs}}
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return 2;
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} else if (x->u63 == i32) { // comparison in uint64, exact because ==
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return 3;
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} else if (x->u64 == i32) { // expected-warning {{comparison of integers of different signs}}
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return 4;
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} else {
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return 5;
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}
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}
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// PR5887
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void test3() {
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unsigned short x, y;
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unsigned int z;
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if ((x > y ? x : y) > z)
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(void) 0;
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}
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// PR5961
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extern char *ptr4;
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void test4() {
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long value;
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if (value < (unsigned long) &ptr4) // expected-warning {{comparison of integers of different signs}}
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return;
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}
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// PR4807
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int test5(unsigned int x) {
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return (x < 0) // expected-warning {{comparison of unsigned expression < 0 is always false}}
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&& (0 > x) // expected-warning {{comparison of 0 > unsigned expression is always false}}
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&& (x >= 0) // expected-warning {{comparison of unsigned expression >= 0 is always true}}
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&& (0 <= x); // expected-warning {{comparison of 0 <= unsigned expression is always true}}
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}
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int test6(unsigned i, unsigned power) {
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unsigned x = (i < (1 << power) ? i : 0);
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return x != 3 ? 1 << power : i;
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}
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// <rdar://problem/8414119> enum >= (enum)0 comparison should not generate any warnings
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enum rdar8414119_Vals { X, Y, Z };
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#define ZERO 0
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#define CHECK(x) (x >= X)
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void rdar8414119_foo(enum rdar8414119_Vals v) {
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if (CHECK(v)) // no-warning
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return;
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if (v >= X) // no-warning
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return;
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}
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int rdar8414119_bar(unsigned x) {
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return x >= ZERO; // no-warning
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}
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#undef ZERO
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#undef CHECK
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int rdar8511238() {
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enum A { A_foo, A_bar };
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enum A a;
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if (a < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}}
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return 0;
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return 20;
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}
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// PR10336
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int test9(int sv, unsigned uv, long slv) {
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return sv == (uv ^= slv); // expected-warning {{comparison of integers of different signs: 'int' and 'unsigned int'}}
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}
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void test10(void) {
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int si;
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unsigned int ui;
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long sl;
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_Bool b;
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b = (si == (ui = sl)); // expected-warning {{comparison of integers of different signs: 'int' and 'unsigned int'}}
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b = (si == (ui = sl&15));
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}
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// PR11572
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struct test11S { unsigned x : 30; };
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int test11(unsigned y, struct test11S *p) {
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return y > (p->x >> 24); // no-warning
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}
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typedef char one_char[1];
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typedef char two_chars[2];
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void test12(unsigned a) {
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if (0 && -1 > a) { }
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}
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