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[libc] add LLVM_LIBC_CAST macro. #127319

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Merged
merged 4 commits into from
Feb 19, 2025
Merged

[libc] add LLVM_LIBC_CAST macro. #127319

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866374c
add LLVM_LIBC_CAST macro
c8ef Feb 15, 2025
a536acb
address review comments
c8ef Feb 17, 2025
cef842e
Merge branch 'main' into bionic-cast
c8ef Feb 17, 2025
6f04a86
static cast
c8ef Feb 19, 2025
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8 changes: 8 additions & 0 deletions libc/include/__llvm-libc-common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,11 @@
#define __NOEXCEPT throw()
#endif

// This macro serves as a generic cast implementation for use in both C and C++,
// similar to `__BIONIC_CAST` in Android.
#undef __LLVM_LIBC_CAST
#define __LLVM_LIBC_CAST(cast, type, value) (cast<type>(value))

#else // not __cplusplus

#undef __BEGIN_C_DECLS
Expand Down Expand Up @@ -85,6 +90,9 @@
#undef _Returns_twice
#define _Returns_twice __attribute__((returns_twice))

#undef __LLVM_LIBC_CAST
#define __LLVM_LIBC_CAST(cast, type, value) ((type)(value))

#endif // __cplusplus

#endif // _LLVM_LIBC_COMMON_H
24 changes: 12 additions & 12 deletions libc/include/llvm-libc-macros/endian-macros.h
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Expand Up @@ -20,27 +20,27 @@
#define htobe16(x) __builtin_bswap16((x))
#define htobe32(x) __builtin_bswap32((x))
#define htobe64(x) __builtin_bswap64((x))
#define htole16(x) ((uint16_t)(x))
#define htole32(x) ((uint32_t)(x))
#define htole64(x) ((uint64_t)(x))
#define htole16(x) __LLVM_LIBC_CAST(static_cast, uint16_t, x)
#define htole32(x) __LLVM_LIBC_CAST(static_cast, uint32_t, x)
#define htole64(x) __LLVM_LIBC_CAST(static_cast, uint64_t, x)
#define be16toh(x) __builtin_bswap16((x))
#define be32toh(x) __builtin_bswap32((x))
#define be64toh(x) __builtin_bswap64((x))
#define le16toh(x) ((uint16_t)(x))
#define le32toh(x) ((uint32_t)(x))
#define le64toh(x) ((uint64_t)(x))
#define le16toh(x) __LLVM_LIBC_CAST(static_cast, uint16_t, x)
#define le32toh(x) __LLVM_LIBC_CAST(static_cast, uint32_t, x)
#define le64toh(x) __LLVM_LIBC_CAST(static_cast, uint64_t, x)

#else

#define htobe16(x) ((uint16_t)(x))
#define htobe32(x) ((uint32_t)(x))
#define htobe64(x) ((uint64_t)(x))
#define htobe16(x) __LLVM_LIBC_CAST(static_cast, uint16_t, x)
#define htobe32(x) __LLVM_LIBC_CAST(static_cast, uint32_t, x)
#define htobe64(x) __LLVM_LIBC_CAST(static_cast, uint64_t, x)
#define htole16(x) __builtin_bswap16((x))
#define htole32(x) __builtin_bswap32((x))
#define htole64(x) __builtin_bswap64((x))
#define be16toh(x) ((uint16_t)(x))
#define be32toh(x) ((uint32_t)(x))
#define be64toh(x) ((uint64_t)(x))
#define be16toh(x) __LLVM_LIBC_CAST(static_cast, uint16_t, x)
#define be32toh(x) __LLVM_LIBC_CAST(static_cast, uint32_t, x)
#define be64toh(x) __LLVM_LIBC_CAST(static_cast, uint64_t, x)
#define le16toh(x) __builtin_bswap16((x))
#define le32toh(x) __builtin_bswap32((x))
#define le64toh(x) __builtin_bswap64((x))
Expand Down
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