derek.holloway
7502bf64a4
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52 lines
2.4 KiB
C
52 lines
2.4 KiB
C
// RUN: %clang_cc1 -triple x86_64 -ffreestanding -verify -std=c2x %s
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/* WG14 N3035: yes
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* _BitInt Fixes
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*/
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#include <stdint.h>
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/* intmax_t and uintmax_t don't need to be able to represent all of the values
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* of a bit-precise integer type. We test this by using a bit-precise integer
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* suffix on some huge values used within the preprocessor.
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*/
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#if 0x1'FFFF'FFFF'FFFF'FFFFwb == 0 /* expected-error {{integer literal is too large to be represented in any integer type}} */
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#endif
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/* Yet we can use that value as an initializer... */
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_BitInt(66) Val = 0x1'FFFF'FFFF'FFFF'FFFFwb;
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/* ...so long as the type is wide enough. */
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intmax_t WrongVal = 0x1'FFFF'FFFF'FFFF'FFFFwb; /* expected-warning-re {{implicit conversion from '_BitInt(66)' to 'intmax_t' (aka '{{.*}}') changes value from 36893488147419103231 to -1}} */
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/* None of the types in stdint.h may be defined in terms of a bit-precise
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* integer type. This macro presumes that if the type is not one of the builtin
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* scalar integer types, the type must be a bit-precise type. We're using this
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* because C does not have a particularly straightforward way to use _Generic
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* with arbitrary bit-precise integer types.
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*/
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#define IS_NOT_BIT_PRECISE(TYPE) _Generic((TYPE){ 0 }, \
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short : 1, int : 1, long : 1, long long : 1, \
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unsigned short : 1, unsigned int : 1, \
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unsigned long : 1, unsigned long long : 1, \
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char : 1, signed char : 1, unsigned char : 1,\
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default : 0)
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static_assert(IS_NOT_BIT_PRECISE(int8_t));
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static_assert(IS_NOT_BIT_PRECISE(uint8_t));
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static_assert(IS_NOT_BIT_PRECISE(int16_t));
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static_assert(IS_NOT_BIT_PRECISE(uint16_t));
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static_assert(IS_NOT_BIT_PRECISE(int32_t));
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static_assert(IS_NOT_BIT_PRECISE(uint32_t));
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static_assert(IS_NOT_BIT_PRECISE(int64_t));
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static_assert(IS_NOT_BIT_PRECISE(uint64_t));
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static_assert(IS_NOT_BIT_PRECISE(intmax_t));
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static_assert(IS_NOT_BIT_PRECISE(uintmax_t));
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static_assert(IS_NOT_BIT_PRECISE(intptr_t));
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static_assert(IS_NOT_BIT_PRECISE(uintptr_t));
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/* FIXME: N3035 also added wording disallowing using a bit-precise integer type
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* as the compatible type for an enumerated type. However, we don't have a
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* direct way to test that, so we're claiming conformance without test
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* coverage.
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*/
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