f32330b22c
Compilers (at least gcc and clang) already provide definitions to create standard types and their range. For example, __INT16_TYPE__ is normally defined as a short to be used with the int16_t typedef, and __INT16_MAX__ is defined as 32767. So it makes sense to rely on them rather than hardcoding our own, especially for the fast types where the compiler itself knows what basic type is best. Using compiler provided definitions makes even more sense when dealing with 64-bit targets where some types such as intptr_t and size_t must have a different size and range. Those definitions are then adjusted by the compiler directly. However there are two cases for which we should override those definitions: * The __INT32_TYPE__ definition on 32-bit targets vary between an int and a long int depending on the architecture and configuration. Notably, all compilers shipped with the Zephyr SDK, except for the i586-zephyr-elfiamcu variant, define __INT32_TYPE__ to a long int. Whereas, all Linux configurations for gcc, both 32-bit and 64-bit, always define __INT32_TYPE__ as an int. Having variability here is not welcome as pointers to a long int and to an int are not deemed compatible by the compiler, and printing an int32_t defined with a long using %d makes the compiler to complain, even if they're the same size on 32-bit targets. Given that an int is always 32 bits on all targets we might care about, and given that Zephyr hardcoded int32_t to an int before, then we just redefine __INT32_TYPE__ and derrivatives to an int to keep the peace in the code. * The confusion also exists with __INTPTR_TYPE__. Looking again at the Zephyr SDK, it is defined as an int, even even when __INT32_TYPE__ is initially a long int. One notable exception is i586-zephyr-elf where __INTPTR_TYPE__ is a long int even when using -m32. On 64-bit targets this is always a long int. So let's redefine __INTPTR_TYPE__ to always be a long int on Zephyr which simplifies the code, works for both 32-bit and 64-bit targets, and mimics what the Linux kernel does. Only a few print format strings needed adjustment. In those two cases, there is a safeguard to ensure the type we're enforcing has the right size and fail the build otherwise. Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/* stdint.h */
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/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_LIB_LIBC_MINIMAL_INCLUDE_STDINT_H_
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#define ZEPHYR_LIB_LIBC_MINIMAL_INCLUDE_STDINT_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define INT8_MAX __INT8_MAX__
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#define INT16_MAX __INT16_MAX__
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#define INT32_MAX __INT32_MAX__
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#define INT64_MAX __INT64_MAX__
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#define INT8_MIN (-INT8_MAX - 1)
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#define INT16_MIN (-INT16_MAX - 1)
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#define INT32_MIN (-INT32_MAX - 1)
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#define INT64_MIN (-INT64_MAX - 1LL)
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#define UINT8_MAX __UINT8_MAX__
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#define UINT16_MAX __UINT16_MAX__
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#define UINT32_MAX __UINT32_MAX__
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#define UINT64_MAX __UINT64_MAX__
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#define INTPTR_MAX __INTPTR_MAX__
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#define INTPTR_MIN (-INTPTR_MAX - 1)
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#define UINTPTR_MAX __UINTPTR_MAX__
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#define PTRDIFF_MAX __PTRDIFF_MAX__
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#define PTRDIFF_MIN (-PTRDIFF_MAX - 1)
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#define SIZE_MAX __SIZE_MAX__
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typedef __INT8_TYPE__ int8_t;
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typedef __INT16_TYPE__ int16_t;
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typedef __INT32_TYPE__ int32_t;
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typedef __INT64_TYPE__ int64_t;
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typedef __INT_FAST8_TYPE__ int_fast8_t;
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typedef __INT_FAST16_TYPE__ int_fast16_t;
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typedef __INT_FAST32_TYPE__ int_fast32_t;
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typedef __INT_FAST64_TYPE__ int_fast64_t;
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typedef __INT_LEAST8_TYPE__ int_least8_t;
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typedef __INT_LEAST16_TYPE__ int_least16_t;
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typedef __INT_LEAST32_TYPE__ int_least32_t;
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typedef __INT_LEAST64_TYPE__ int_least64_t;
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typedef __UINT8_TYPE__ uint8_t;
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typedef __UINT16_TYPE__ uint16_t;
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typedef __UINT32_TYPE__ uint32_t;
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typedef __UINT64_TYPE__ uint64_t;
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typedef __UINT_FAST8_TYPE__ uint_fast8_t;
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typedef __UINT_FAST16_TYPE__ uint_fast16_t;
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typedef __UINT_FAST32_TYPE__ uint_fast32_t;
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typedef __UINT_FAST64_TYPE__ uint_fast64_t;
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typedef __UINT_LEAST8_TYPE__ uint_least8_t;
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typedef __UINT_LEAST16_TYPE__ uint_least16_t;
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typedef __UINT_LEAST32_TYPE__ uint_least32_t;
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typedef __UINT_LEAST64_TYPE__ uint_least64_t;
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typedef __INTPTR_TYPE__ intptr_t;
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typedef __UINTPTR_TYPE__ uintptr_t;
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_LIB_LIBC_MINIMAL_INCLUDE_STDINT_H_ */
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