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remove ARRAY_SIZE2 since bootloader is only built with C

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This commit is contained in:
hathach 2019-04-24 12:26:26 +07:00
parent 69a1b555e4
commit 3fec038ed8
2 changed files with 2 additions and 145 deletions
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4
src/usb/uf2/ghostfat.c
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@ -89,10 +89,10 @@ static struct TextFile const info[] = {
// WARNING -- code presumes each non-UF2 file content fits in single sector
// Cannot programmatically statically assert .content length
// for each element above.
STATIC_ASSERT(ARRAY_SIZE2(indexFile) < 512);
STATIC_ASSERT(ARRAY_SIZE(indexFile) < 512);
#define NUM_FILES (ARRAY_SIZE2(info))
#define NUM_FILES (ARRAY_SIZE(info))
#define NUM_DIRENTRIES (NUM_FILES + 1) // Code adds volume label as first root directory entry

143
src/usb/uf2/macros.h
View File

@ -26,149 +26,6 @@ SOFTWARE.
*/
#ifndef ARRAYSIZE2_H
#define ARRAYSIZE2_H
#ifndef __has_feature
#define __has_feature(x) 0 // Compatibility with non-clang compilers.
#endif
#if __cplusplus >= 199711L
#pragma message "using Ivan J. Johnson's ARRAY_SIZE2"
// Works on older compilers, even Visual C++ 6....
// Created by Ivan J. Johnson, March 06, 2007
// See http://drdobbs.com/cpp/197800525?pgno=1
//
// Pseudocode:
// if x is not an array
// issue a compile-time error
// else
// use the traditional (non-typesafe) C99 COUNTOF expression
//
// If the argument is any of:
// object of class type, such as an std::vector
// floating-point type
// function pointer
// pointer-to-member
// then the first reinterpret_cast<> is not legal (compiler error)
//
// The type for check1 is chosen and named to help understand
// the cause of the error, because the class name is likely to
// appear in the compiler error message.
//
// If check1 succeeds, then the argument must be one of:
// an integral type
// an enumerated type
// a pointer to an object
// an array
//
// Check2 expands approximately to sizeof(check_type(x, &x)),
// where check_type is an overloaded function.
// Because this is purely a compile-time computation,
// the function is never really called or even implemented,
// but it lets the compiler apply overload resolution,
// which allows further type discrimination.
// There are three possibilities to consider:
// x is an integral type or enumerated type.
// In this case, neither of the two function overloads
// is a match, resulting in a compiler error.
// x is a pointer to an object.
// In this case, the first argument to check_type()
// is a pointer and the second one is a pointer-to-pointer.
// The best function match is the first overload of check_type,
// the one that returns an incomplete type (Is_pointer).
// However, because Is_pointer is an incomplete type,
// sizeof(Is_pointer) is not a valid expression,
// resulting in a compiler error.
// x is an array.
// In this case, the first argument to check_type()
// is an array and the second is a pointer-to-array.
// A pointer-to-array is *NOT* convertible to a
// pointer-to-pointer, so the first overload of
// check_type() is not a match.
// However, an array IS convertible to a pointer,
// and a pointer-to-array already is a pointer.
// Any pointer is convertible to a void*,
// so the second function overload is a match.
// That overload returns a complete type (Is_array).
// Because it's a complete type,
// sizeof(Is_array) is a valid expression.
// Thus, the compiler has EXCLUDED every possible type
// except arrays via compilation errors before reaching
// the third line.
// Moreover, check1 and check2 are reduced to the value zero,
// while the third line is the old type-unsafe C-style macro,
// now made entirely type-safe.
//
// Additional benefits:
// The result is itself constexpr
//
//
#define ARRAY_SIZE2(arr) ( \
0 * sizeof(reinterpret_cast<const ::Bad_arg_to_COUNTOF*>(arr)) + /*check1*/ \
0 * sizeof(::Bad_arg_to_COUNTOF::check_type((arr), &(arr))) + /*check2*/ \
sizeof(arr) / sizeof((arr)[0]) /* eval */ \
)
struct Bad_arg_to_COUNTOF {
class Is_pointer; // incomplete
class Is_array {};
template <typename T>
static Is_pointer check_type(const T*, const T* const*);
static Is_array check_type(const void*, const void*);
};
#elif __cplusplus >= 201103L || /* any compiler claiming C++11 support */ \
_MSC_VER >= 1900 || /* Visual C++ 2015 or higher */ \
__has_feature(cxx_constexpr) /* CLang versions supporting constexp */
#pragma message "C++11 version ARRAY_SIZE2"
namespace detail
{
template <typename T, std::size_t N>
constexpr std::size_t countof(T const (&)[N]) noexcept
{
return N;
}
} // namespace detail
#define ARRAY_SIZE2(arr) detail::countof(arr)
#elif _MSC_VER // Visual C++ fallback
#pragma message "using Microsoft Visual C++ intrinsic ARRAY_SIZE2"
#define ARRAY_SIZE2(arr) _countof(arr)
#elif __cplusplus >= 199711L && ( /* C++ 98 trick */ \
defined(__INTEL_COMPILER) || \
defined(__clang__) || \
(defined(__GNUC__) && ( \
(__GNUC__ > 4) || \
(__GNUC__ == 4 && __GNUC_MINOR__ >= 4) \
)))
#pragma message "C++98 version ARRAY_SIZE2"
template <typename T, std::size_t N>
char(&_ArraySizeHelperRequiresArray(T(&)[N]))[N];
#define ARRAY_SIZE2(x) sizeof(_ArraySizeHelperRequiresArray(x))
#else
#pragma message "Using type-unsafe version of ARRAY_SIZE2"
// This is the worst-case scenario macro.
// While it is valid C, it is NOT typesafe.
// For example, if the parameter arr is a pointer instead of array,
// the compiler will SILENTLY give a (likely) incorrect result.
#define ARRAY_SIZE2(arr) sizeof(arr) / sizeof(arr[0])
#endif
#endif // ARRAYSIZE2_H
#ifndef COMPILE_DATE_H
#define COMPILE_DATE_H