88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
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/* SPDX-License-Identifier: GPL-3.0-or-later
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* Copyright © 2016-2021 The TokTok team.
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*/
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/**
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* C language compatibility macros for varying compiler support.
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*/
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#ifndef C_TOXCORE_TOXCORE_CCOMPAT_H
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#define C_TOXCORE_TOXCORE_CCOMPAT_H
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#include <stddef.h> // NULL, size_t
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#include "attributes.h"
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//!TOKSTYLE-
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// Variable length arrays.
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// VLA(type, name, size) allocates a variable length array with automatic
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// storage duration. VLA_SIZE(name) evaluates to the runtime size of that array
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// in bytes.
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//
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// If C99 VLAs are not available, an emulation using alloca (stack allocation
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// "function") is used. Note the semantic difference: alloca'd memory does not
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// get freed at the end of the declaration's scope. Do not use VLA() in loops or
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// you may run out of stack space.
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#if !defined(DISABLE_VLA) && !defined(_MSC_VER) && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
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// C99 VLAs.
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#define ALLOC_VLA(type, name, size) type name[size]
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#define SIZEOF_VLA sizeof
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#else
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// Emulation using alloca.
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#ifdef _WIN32
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#include <malloc.h>
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#elif defined(__COMPCERT__)
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// TODO(iphydf): This leaks memory like crazy, so compcert is useless for now.
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// Once we're rid of VLAs, we can remove this and compcert becomes useful.
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#define alloca malloc
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#include <stdlib.h>
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#elif defined(__linux__)
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#include <alloca.h>
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#else
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#include <stdlib.h>
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#if !defined(alloca) && defined(__GNUC__)
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#define alloca __builtin_alloca
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#endif
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#endif
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#define ALLOC_VLA(type, name, size) \
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const size_t name##_vla_size = (size) * sizeof(type); \
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type *const name = (type *)alloca(name##_vla_size)
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#define SIZEOF_VLA(name) name##_vla_size
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#endif
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#ifdef MAX_VLA_SIZE
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#include <assert.h>
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#define VLA(type, name, size) \
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ALLOC_VLA(type, name, size); \
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assert((size_t)(size) * sizeof(type) <= MAX_VLA_SIZE)
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#else
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#define VLA ALLOC_VLA
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#endif
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#if !defined(__cplusplus) || __cplusplus < 201103L
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#define nullptr NULL
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#ifndef static_assert
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#ifdef __GNUC__
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// We'll just assume gcc and clang support C11 _Static_assert.
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#define static_assert _Static_assert
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#else // !__GNUC__
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#define STATIC_ASSERT_(cond, msg, line) typedef int static_assert_##line[(cond) ? 1 : -1]
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#define STATIC_ASSERT(cond, msg, line) STATIC_ASSERT_(cond, msg, line)
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#define static_assert(cond, msg) STATIC_ASSERT(cond, msg, __LINE__)
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#endif // !__GNUC__
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#endif // !static_assert
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#endif // !__cplusplus
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#ifdef __GNUC__
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#define GNU_PRINTF(f, a) __attribute__((__format__(__printf__, f, a)))
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#else
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#define GNU_PRINTF(f, a)
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#endif
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//!TOKSTYLE+
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#endif // C_TOXCORE_TOXCORE_CCOMPAT_H
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