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common_defs.h
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199 lines (167 loc) · 6.71 KB
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#ifndef SIMDJSON_COMMON_DEFS_H
#define SIMDJSON_COMMON_DEFS_H
#include <cassert>
#include "simdjson/portability.h"
namespace simdjson {
#ifndef SIMDJSON_EXCEPTIONS
#if __cpp_exceptions
#define SIMDJSON_EXCEPTIONS 1
#else
#define SIMDJSON_EXCEPTIONS 0
#endif
#endif
/** The maximum document size supported by simdjson. */
constexpr size_t SIMDJSON_MAXSIZE_BYTES = 0xFFFFFFFF;
/**
* The amount of padding needed in a buffer to parse JSON.
*
* the input buf should be readable up to buf + SIMDJSON_PADDING
* this is a stopgap; there should be a better description of the
* main loop and its behavior that abstracts over this
* See https://github.com/lemire/simdjson/issues/174
*/
constexpr size_t SIMDJSON_PADDING = 32;
/**
* By default, simdjson supports this many nested objects and arrays.
*
* This is the default for parser::max_depth().
*/
constexpr size_t DEFAULT_MAX_DEPTH = 1024;
} // namespace simdjson
#if defined(__GNUC__)
// Marks a block with a name so that MCA analysis can see it.
#define BEGIN_DEBUG_BLOCK(name) __asm volatile("# LLVM-MCA-BEGIN " #name);
#define END_DEBUG_BLOCK(name) __asm volatile("# LLVM-MCA-END " #name);
#define DEBUG_BLOCK(name, block) BEGIN_DEBUG_BLOCK(name); block; END_DEBUG_BLOCK(name);
#else
#define BEGIN_DEBUG_BLOCK(name)
#define END_DEBUG_BLOCK(name)
#define DEBUG_BLOCK(name, block)
#endif
// Align to N-byte boundary
#define ROUNDUP_N(a, n) (((a) + ((n)-1)) & ~((n)-1))
#define ROUNDDOWN_N(a, n) ((a) & ~((n)-1))
#define ISALIGNED_N(ptr, n) (((uintptr_t)(ptr) & ((n)-1)) == 0)
#if defined(SIMDJSON_REGULAR_VISUAL_STUDIO)
#define really_inline __forceinline
#define never_inline __declspec(noinline)
#define UNUSED
#define WARN_UNUSED
#ifndef likely
#define likely(x) x
#endif
#ifndef unlikely
#define unlikely(x) x
#endif
#define SIMDJSON_PUSH_DISABLE_WARNINGS __pragma(warning( push ))
#define SIMDJSON_PUSH_DISABLE_ALL_WARNINGS __pragma(warning( push, 0 ))
#define SIMDJSON_DISABLE_VS_WARNING(WARNING_NUMBER) __pragma(warning( disable : WARNING_NUMBER ))
// Get rid of Intellisense-only warnings (Code Analysis)
// Though __has_include is C++17, it is supported in Visual Studio 2017 or better (_MSC_VER>=1910).
#if defined(_MSC_VER) && (_MSC_VER>=1910)
#if __has_include(<CppCoreCheck\Warnings.h>)
#include <CppCoreCheck\Warnings.h>
#define SIMDJSON_DISABLE_UNDESIRED_WARNINGS SIMDJSON_DISABLE_VS_WARNING(ALL_CPPCORECHECK_WARNINGS)
#endif
#endif
#ifndef SIMDJSON_DISABLE_UNDESIRED_WARNINGS
#define SIMDJSON_DISABLE_UNDESIRED_WARNINGS
#endif
#define SIMDJSON_DISABLE_DEPRECATED_WARNING SIMDJSON_DISABLE_VS_WARNING(4996)
#define SIMDJSON_POP_DISABLE_WARNINGS __pragma(warning( pop ))
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
#define really_inline inline __attribute__((always_inline))
#define never_inline inline __attribute__((noinline))
#define UNUSED __attribute__((unused))
#define WARN_UNUSED __attribute__((warn_unused_result))
#ifndef likely
#define likely(x) __builtin_expect(!!(x), 1)
#endif
#ifndef unlikely
#define unlikely(x) __builtin_expect(!!(x), 0)
#endif
#define SIMDJSON_PUSH_DISABLE_WARNINGS _Pragma("GCC diagnostic push")
// gcc doesn't seem to disable all warnings with all and extra, add warnings here as necessary
#define SIMDJSON_PUSH_DISABLE_ALL_WARNINGS SIMDJSON_PUSH_DISABLE_WARNINGS \
SIMDJSON_DISABLE_GCC_WARNING(-Weffc++) \
SIMDJSON_DISABLE_GCC_WARNING(-Wall) \
SIMDJSON_DISABLE_GCC_WARNING(-Wconversion) \
SIMDJSON_DISABLE_GCC_WARNING(-Wextra) \
SIMDJSON_DISABLE_GCC_WARNING(-Wattributes) \
SIMDJSON_DISABLE_GCC_WARNING(-Wimplicit-fallthrough) \
SIMDJSON_DISABLE_GCC_WARNING(-Wnon-virtual-dtor) \
SIMDJSON_DISABLE_GCC_WARNING(-Wreturn-type) \
SIMDJSON_DISABLE_GCC_WARNING(-Wshadow) \
SIMDJSON_DISABLE_GCC_WARNING(-Wunused-parameter) \
SIMDJSON_DISABLE_GCC_WARNING(-Wunused-variable)
#define SIMDJSON_PRAGMA(P) _Pragma(#P)
#define SIMDJSON_DISABLE_GCC_WARNING(WARNING) SIMDJSON_PRAGMA(GCC diagnostic ignored #WARNING)
#if defined(SIMDJSON_CLANG_VISUAL_STUDIO)
#define SIMDJSON_DISABLE_UNDESIRED_WARNINGS SIMDJSON_DISABLE_GCC_WARNING(-Wmicrosoft-include)
#else
#define SIMDJSON_DISABLE_UNDESIRED_WARNINGS
#endif
#define SIMDJSON_DISABLE_DEPRECATED_WARNING SIMDJSON_DISABLE_GCC_WARNING(-Wdeprecated-declarations)
#define SIMDJSON_POP_DISABLE_WARNINGS _Pragma("GCC diagnostic pop")
#endif // MSC_VER
#if defined(SIMDJSON_VISUAL_STUDIO)
/**
* It does not matter here whether you are using
* the regular visual studio or clang under visual
* studio.
*/
#if SIMDJSON_USING_LIBRARY
#define SIMDJSON_DLLIMPORTEXPORT __declspec(dllimport)
#else
#define SIMDJSON_DLLIMPORTEXPORT __declspec(dllexport)
#endif
#else
#define SIMDJSON_DLLIMPORTEXPORT
#endif
// C++17 requires string_view.
#if SIMDJSON_CPLUSPLUS17
#define SIMDJSON_HAS_STRING_VIEW
#endif
// This macro (__cpp_lib_string_view) has to be defined
// for C++17 and better, but if it is otherwise defined,
// we are going to assume that string_view is available
// even if we do not have C++17 support.
#ifdef __cpp_lib_string_view
#define SIMDJSON_HAS_STRING_VIEW
#endif
// Some systems have string_view even if we do not have C++17 support,
// and even if __cpp_lib_string_view is undefined, it is the case
// with Apple clang version 11.
// We must handle it. *This is important.*
#ifndef SIMDJSON_HAS_STRING_VIEW
#if defined __has_include
// do not combine the next #if with the previous one (unsafe)
#if __has_include (<string_view>)
// now it is safe to trigger the include
#include <string_view> // though the file is there, it does not follow that we got the implementation
#if defined(_LIBCPP_STRING_VIEW)
// Ah! So we under libc++ which under its Library Fundamentals Technical Specification, which preceeded C++17,
// included string_view.
// This means that we have string_view *even though* we may not have C++17.
#define SIMDJSON_HAS_STRING_VIEW
#endif // _LIBCPP_STRING_VIEW
#endif // __has_include (<string_view>)
#endif // defined __has_include
#endif // def SIMDJSON_HAS_STRING_VIEW
// end of complicated but important routine to try to detect string_view.
//
// Backfill std::string_view using nonstd::string_view on systems where
// we expect that string_view is missing. Important: if we get this wrong,
// we will end up with two string_view definitions and potential trouble.
// That is why we work so hard above to avoid it.
//
#ifndef SIMDJSON_HAS_STRING_VIEW
SIMDJSON_PUSH_DISABLE_ALL_WARNINGS
#include "simdjson/nonstd/string_view.hpp"
SIMDJSON_POP_DISABLE_WARNINGS
namespace std {
using string_view = nonstd::string_view;
}
#endif // SIMDJSON_HAS_STRING_VIEW
#undef SIMDJSON_HAS_STRING_VIEW // We are not going to need this macro anymore.
#endif // SIMDJSON_COMMON_DEFS_H