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[Ref] mpt/main/main.hpp: Add main library that abstracts away platfor…
…m-specific non-standard handling of main(), like Win32 wmain, MinGW missing prototypes, and DJGPP crt0 flags. git-svn-id: https://source.openmpt.org/svn/openmpt/trunk/OpenMPT@21699 56274372-70c3-4bfc-bfc3-4c3a0b034d27
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| Original file line number | Diff line number | Diff line change |
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| /* SPDX-License-Identifier: BSL-1.0 OR BSD-3-Clause */ | ||
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| #ifndef MPT_MAIN_MAIN_HPP | ||
| #define MPT_MAIN_MAIN_HPP | ||
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| #include "mpt/base/check_platform.hpp" | ||
| #include "mpt/base/detect.hpp" | ||
| #include "mpt/base/integer.hpp" | ||
| #include "mpt/base/macros.hpp" | ||
| #include "mpt/base/namespace.hpp" | ||
| #include "mpt/string/types.hpp" | ||
| #include "mpt/string_transcode/transcode.hpp" | ||
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| #include <type_traits> | ||
| #include <vector> | ||
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| #if MPT_OS_DJGPP | ||
| #include <cassert> | ||
| #endif // MPT_OS_DJGPP | ||
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| #if MPT_OS_DJGPP | ||
| #include <crt0.h> | ||
| #endif // MPT_OS_DJGPP | ||
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| #if MPT_OS_WINDOWS | ||
| #include <windows.h> | ||
| #endif // MPT_OS_WINDOWS | ||
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| namespace mpt { | ||
| inline namespace MPT_INLINE_NS { | ||
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| namespace main { | ||
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| #if MPT_OS_DJGPP | ||
| /* Work-around <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45977> */ | ||
| /* clang-format off */ | ||
| #define MPT_MAIN_PREFIX \ | ||
| extern "C" { \ | ||
| int _crt0_startup_flags = 0 \ | ||
| | _CRT0_FLAG_NONMOVE_SBRK /* force interrupt compatible allocation */ \ | ||
| | _CRT0_DISABLE_SBRK_ADDRESS_WRAP /* force NT compatible allocation */ \ | ||
| | _CRT0_FLAG_LOCK_MEMORY /* lock all code and data at program startup */ \ | ||
| | 0; \ | ||
| } \ | ||
| /* clang-format on */ | ||
| #endif /* MPT_OS_DJGPP */ | ||
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| #if !defined(MPT_MAIN_PREFIX) | ||
| #define MPT_MAIN_PREFIX | ||
| #endif | ||
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| #if MPT_OS_WINDOWS && defined(UNICODE) | ||
| #define MPT_MAIN_NAME wmain | ||
| #elif defined(MPT_OS_WINDOWS) | ||
| #define MPT_MAIN_NAME main | ||
| #endif | ||
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| #if !defined(MPT_MAIN_NAME) | ||
| #define MPT_MAIN_NAME main | ||
| #endif | ||
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| #if MPT_OS_WINDOWS && defined(UNICODE) | ||
| #define MPT_MAIN_ARGV_TYPE wchar_t | ||
| #elif defined(MPT_OS_WINDOWS) | ||
| #define MPT_MAIN_ARGV_TYPE char | ||
| #endif | ||
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| #if !defined(MPT_MAIN_NAME) | ||
| #define MPT_MAIN_ARGV_TYPE char | ||
| #endif | ||
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| #if MPT_OS_WINDOWS && (MPT_COMPILER_GCC || MPT_COMPILER_CLANG) | ||
| #if defined(UNICODE) | ||
| #define MPT_MAIN_DECL extern "C" int wmain(int argc, wchar_t * argv[]); | ||
| #endif | ||
| #endif | ||
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| #if !defined(MPT_MAIN_DECL) | ||
| #define MPT_MAIN_DECL | ||
| #endif | ||
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| #if MPT_OS_DJGPP | ||
| /* clang-format off */ | ||
| #define MPT_MAIN_PROLOG() \ | ||
| do { \ | ||
| _crt0_startup_flags &= ~_CRT0_FLAG_LOCK_MEMORY; \ | ||
| assert(mpt::platform::libc().is_ok()); \ | ||
| } while (0) \ | ||
| /**/ | ||
| /* clang-format on */ | ||
| #endif // MPT_OS_DJGPP | ||
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| #if !defined(MPT_MAIN_PROLOG) | ||
| #define MPT_MAIN_PROLOG() do { } while(0) | ||
| #endif | ||
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| #if MPT_OS_WINDOWS && (MPT_COMPILER_GCC || MPT_COMPILER_CLANG) | ||
| #if defined(UNICODE) | ||
| #define MPT_MAIN_DEF_PREFIX extern "C" | ||
| #endif | ||
| #endif // MPT_OS_WINDOWS && (MPT_COMPILER_GCC || MPT_COMPILER_CLANG) | ||
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| #if !defined(MPT_MAIN_DEF_PREFIX) | ||
| #define MPT_MAIN_DEF_PREFIX | ||
| #endif | ||
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| inline mpt::ustring transcode_arg(char * arg) { | ||
| return mpt::transcode<mpt::ustring>(mpt::logical_encoding::locale, arg); | ||
| } | ||
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| #if !defined(MPT_COMPILER_QUIRK_NO_WCHAR) | ||
| inline mpt::ustring transcode_arg(wchar_t * arg) { | ||
| return mpt::transcode<mpt::ustring>(arg); | ||
| } | ||
| #endif | ||
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| template <typename Tchar> | ||
| inline std::vector<mpt::ustring> transcode_argv(int argc, Tchar * argv[]) { | ||
| std::vector<mpt::ustring> args; | ||
| args.reserve(argc); | ||
| for (int arg = 0; arg < argc; ++arg) { | ||
| args.push_back(transcode_arg(argv[arg])); | ||
| } | ||
| return args; | ||
| } | ||
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| #if !defined(MPT_MAIN_POSTFIX) | ||
| #define MPT_MAIN_POSTFIX | ||
| #endif | ||
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| /* clang-format off */ | ||
| #define MPT_MAIN_IMPLEMENT_MAIN(ns) \ | ||
| MPT_MAIN_PREFIX \ | ||
| MPT_MAIN_DECL \ | ||
| MPT_MAIN_DEF_PREFIX int MPT_MAIN_NAME(int argc, MPT_MAIN_ARGV_TYPE * argv[]) { \ | ||
| MPT_MAIN_PROLOG(); \ | ||
| static_assert(std::is_same<decltype(ns::main), mpt::uint8(std::vector<mpt::ustring>)>::value); \ | ||
| return static_cast<int>(ns::main(mpt::main::transcode_argv(argc, argv))); \ | ||
| } \ | ||
| MPT_MAIN_POSTFIX \ | ||
| /**/ | ||
| /* clang-format on */ | ||
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| /* clang-format off */ | ||
| #define MPT_MAIN_IMPLEMENT_MAIN_NO_ARGS(ns) \ | ||
| MPT_MAIN_PREFIX \ | ||
| MPT_MAIN_DECL \ | ||
| MPT_MAIN_DEF_PREFIX int MPT_MAIN_NAME(int argc, MPT_MAIN_ARGV_TYPE * argv[]) { \ | ||
| MPT_MAIN_PROLOG(); \ | ||
| static_assert(std::is_same<decltype(ns::main), mpt::uint8(void); \ | ||
| MPT_UNUSED(argc); \ | ||
| MPT_UNUSED(argv); \ | ||
| return static_cast<int>(ns::main()); \ | ||
| } \ | ||
| MPT_MAIN_POSTFIX \ | ||
| /**/ | ||
| /* clang-format on */ | ||
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| } // namespace main | ||
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| } // namespace MPT_INLINE_NS | ||
| } // namespace mpt | ||
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| #endif // MPT_MAIN_MAIN_HPP |