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/*
* Copyright (c) 2020 Andrew Kelley
*
* This file is part of zig, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#ifndef ZIG_MEM_TYPE_INFO_HPP
#define ZIG_MEM_TYPE_INFO_HPP
#include "config.h"
#ifndef ZIG_TYPE_INFO_IMPLEMENTATION
# ifdef ZIG_ENABLE_MEM_PROFILE
# define ZIG_TYPE_INFO_IMPLEMENTATION 1
# else
# define ZIG_TYPE_INFO_IMPLEMENTATION 0
# endif
#endif
namespace mem {
#if ZIG_TYPE_INFO_IMPLEMENTATION == 0
struct TypeInfo {
size_t size;
size_t alignment;
template <typename T>
static constexpr TypeInfo make() {
return {sizeof(T), alignof(T)};
}
};
#elif ZIG_TYPE_INFO_IMPLEMENTATION == 1
//
// A non-portable way to get a human-readable type-name compatible with
// non-RTTI C++ compiler mode; eg. `-fno-rtti`.
//
// Minimum requirements are c++11 and a compiler that has a constant for the
// current function's decorated name whereby a template-type name can be
// computed. eg. `__PRETTY_FUNCTION__` or `__FUNCSIG__`.
//
// given the following snippet:
//
// | #include <stdio.h>
// |
// | struct Top {};
// | namespace mynamespace {
// | using custom = unsigned int;
// | struct Foo {
// | struct Bar {};
// | };
// | };
// |
// | template <typename T>
// | void foobar() {
// | #ifdef _MSC_VER
// | fprintf(stderr, "--> %s\n", __FUNCSIG__);
// | #else
// | fprintf(stderr, "--> %s\n", __PRETTY_FUNCTION__);
// | #endif
// | }
// |
// | int main() {
// | foobar<Top>();
// | foobar<unsigned int>();
// | foobar<mynamespace::custom>();
// | foobar<mynamespace::Foo*>();
// | foobar<mynamespace::Foo::Bar*>();
// | }
//
// gcc 9.2.0 produces:
// --> void foobar() [with T = Top]
// --> void foobar() [with T = unsigned int]
// --> void foobar() [with T = unsigned int]
// --> void foobar() [with T = mynamespace::Foo*]
// --> void foobar() [with T = mynamespace::Foo::Bar*]
//
// xcode 11.3.1/clang produces:
// --> void foobar() [T = Top]
// --> void foobar() [T = unsigned int]
// --> void foobar() [T = unsigned int]
// --> void foobar() [T = mynamespace::Foo *]
// --> void foobar() [T = mynamespace::Foo::Bar *]
//
// VStudio 2019 16.5.0/msvc produces:
// --> void __cdecl foobar<struct Top>(void)
// --> void __cdecl foobar<unsigned int>(void)
// --> void __cdecl foobar<unsigned int>(void)
// --> void __cdecl foobar<structmynamespace::Foo*>(void)
// --> void __cdecl foobar<structmynamespace::Foo::Bar*>(void)
//
struct TypeInfo {
const char *name_ptr;
size_t name_len;
size_t size;
size_t alignment;
static constexpr TypeInfo to_type_info(const char *str, size_t start, size_t end, size_t size, size_t alignment) {
return TypeInfo{str + start, end - start, size, alignment};
}
static constexpr size_t index_of(const char *str, char c) {
return *str == c ? 0 : 1 + index_of(str + 1, c);
}
template <typename T>
static constexpr const char *decorated_name() {
#ifdef _MSC_VER
return __FUNCSIG__;
#else
return __PRETTY_FUNCTION__;
#endif
}
static constexpr TypeInfo extract(const char *decorated, size_t size, size_t alignment) {
#ifdef _MSC_VER
return to_type_info(decorated, index_of(decorated, '<') + 1, index_of(decorated, '>'), size, alignment);
#else
return to_type_info(decorated, index_of(decorated, '=') + 2, index_of(decorated, ']'), size, alignment);
#endif
}
template <typename T>
static constexpr TypeInfo make() {
return TypeInfo::extract(TypeInfo::decorated_name<T>(), sizeof(T), alignof(T));
}
};
#endif // ZIG_TYPE_INFO_IMPLEMENTATION
} // namespace mem
#endif
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