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269 lines
12 KiB
269 lines
12 KiB
5 years ago
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// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
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// Copyright 2015-2019 Antony Polukhin.
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_DLL_ALIAS_HPP
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#define BOOST_DLL_ALIAS_HPP
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#include <boost/dll/config.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/predef/compiler.h>
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#include <boost/predef/os.h>
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#include <boost/dll/detail/aggressive_ptr_cast.hpp>
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#if BOOST_COMP_GNUC // MSVC does not have <stdint.h> and defines it in some other header, MinGW requires that header.
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#include <stdint.h> // intptr_t
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#endif
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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/// \file boost/dll/alias.hpp
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/// \brief Includes alias methods and macro. You can include this header or
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/// boost/dll/shared_library.hpp to reduce dependencies
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/// in case you do not use the refcountable functions.
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namespace boost { namespace dll {
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#ifdef BOOST_DLL_DOXYGEN
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/// Define this macro to explicitly specify translation unit in which alias must be instantiated.
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/// See section 'Limitations' for more info. You may find usage examples in source codes of almost each tutorial.
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/// Must be used in code, when \forcedmacrolink{BOOST_DLL_FORCE_NO_WEAK_EXPORTS} is defined
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#define BOOST_DLL_FORCE_ALIAS_INSTANTIATION
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/// Define this macro to disable exporting weak symbols and start using the \forcedmacrolink{BOOST_DLL_FORCE_ALIAS_INSTANTIATION}.
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/// This may be useful for working around linker problems or to test your program for compatibility with linkers that do not support export of weak symbols.
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#define BOOST_DLL_FORCE_NO_WEAK_EXPORTS
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#endif
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#if BOOST_COMP_MSVC || ((BOOST_COMP_INTEL || BOOST_COMP_CLANG) && BOOST_OS_WINDOWS)
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#define BOOST_DLL_SELECTANY __declspec(selectany)
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#define BOOST_DLL_SECTION(SectionName, Permissions) \
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BOOST_STATIC_ASSERT_MSG( \
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sizeof(#SectionName) < 10, \
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"Some platforms require section names to be at most 8 bytes" \
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); \
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__pragma(section(#SectionName, Permissions)) __declspec(allocate(#SectionName)) \
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/**/
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#else // #if BOOST_COMP_MSVC
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#if BOOST_OS_WINDOWS || BOOST_OS_ANDROID || BOOST_COMP_IBM
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// There are some problems with mixing `__dllexport__` and `weak` using MinGW
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// See https://sourceware.org/bugzilla/show_bug.cgi?id=17480
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//
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// Android had an issue with exporting weak symbols
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// https://code.google.com/p/android/issues/detail?id=70206
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#define BOOST_DLL_SELECTANY
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#else // #if BOOST_OS_WINDOWS
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/*!
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* \brief Macro that allows linker to select any occurrence of this symbol instead of
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* failing with 'multiple definitions' error at linktime.
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*
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* This macro does not work on Android, IBM XL C/C++ and MinGW+Windows
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* because of linker problems with exporting weak symbols
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* (See https://code.google.com/p/android/issues/detail?id=70206, https://sourceware.org/bugzilla/show_bug.cgi?id=17480)
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*/
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#define BOOST_DLL_SELECTANY __attribute__((weak))
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#endif // #if BOOST_OS_WINDOWS
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// TODO: improve section permissions using following info:
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// http://stackoverflow.com/questions/6252812/what-does-the-aw-flag-in-the-section-attribute-mean
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#if !BOOST_OS_MACOS && !BOOST_OS_IOS
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/*!
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* \brief Macro that puts symbol to a specific section. On MacOS all the sections are put into "__DATA" segment.
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* \param SectionName Name of the section. Must be a valid C identifier without quotes not longer than 8 bytes.
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* \param Permissions Can be "read" or "write" (without quotes!).
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*/
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#define BOOST_DLL_SECTION(SectionName, Permissions) \
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BOOST_STATIC_ASSERT_MSG( \
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sizeof(#SectionName) < 10, \
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"Some platforms require section names to be at most 8 bytes" \
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); \
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__attribute__ ((section (#SectionName))) \
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/**/
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#else // #if !BOOST_OS_MACOS && !BOOST_OS_IOS
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#define BOOST_DLL_SECTION(SectionName, Permissions) \
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BOOST_STATIC_ASSERT_MSG( \
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sizeof(#SectionName) < 10, \
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"Some platforms require section names to be at most 8 bytes" \
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); \
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__attribute__ ((section ( "__DATA," #SectionName))) \
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/**/
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#endif // #if #if !BOOST_OS_MACOS && !BOOST_OS_IOS
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#endif // #if BOOST_COMP_MSVC
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// Alias - is just a variable that pointers to original data
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//
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// A few attempts were made to avoid additional indirection:
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// 1)
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// // Does not work on Windows, work on Linux
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// extern "C" BOOST_SYMBOL_EXPORT void AliasName() {
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// reinterpret_cast<void (*)()>(Function)();
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// }
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//
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// 2)
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// // Does not work on Linux (changes permissions of .text section and produces incorrect DSO)
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// extern "C" BOOST_SYMBOL_EXPORT void* __attribute__ ((section(".text#")))
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// func_ptr = *reinterpret_cast<std::ptrdiff_t**>(&foo::bar);
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//
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// 3) // requires mangled name of `Function`
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// // AliasName() __attribute__ ((weak, alias ("Function")))
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//
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// // hard to use
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// `#pragma comment(linker, "/alternatename:_pWeakValue=_pDefaultWeakValue")`
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/*!
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* \brief Makes an alias name for exported function or variable.
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*
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* This macro is useful in cases of long mangled C++ names. For example some `void boost::foo(std::string)`
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* function name will change to something like `N5boostN3foosE` after mangling.
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* Importing function by `N5boostN3foosE` name does not looks user friendly, especially assuming the fact
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* that different compilers have different mangling schemes. AliasName is the name that won't be mangled
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* and can be used as a portable import name.
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*
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*
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* Can be used in any namespace, including global. FunctionOrVar must be fully qualified,
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* so that address of it could be taken. Multiple different aliases for a single variable/function
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* are allowed.
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*
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* Make sure that AliasNames are unique per library/executable. Functions or variables
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* in global namespace must not have names same as AliasNames.
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*
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* Same AliasName in different translation units must point to the same FunctionOrVar.
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*
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* Puts all the aliases into the \b "boostdll" read only section of the binary. Equal to
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* \forcedmacrolink{BOOST_DLL_ALIAS_SECTIONED}(FunctionOrVar, AliasName, boostdll).
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*
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* \param FunctionOrVar Function or variable for which an alias must be made.
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* \param AliasName Name of the alias. Must be a valid C identifier.
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*
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* \b Example:
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* \code
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* namespace foo {
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* void bar(std::string&);
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*
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* BOOST_DLL_ALIAS(foo::bar, foo_bar)
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* }
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*
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* BOOST_DLL_ALIAS(foo::bar, foo_bar_another_alias_name)
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* \endcode
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*
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* \b See: \forcedmacrolink{BOOST_DLL_ALIAS_SECTIONED} for making alias in a specific section.
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*/
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#define BOOST_DLL_ALIAS(FunctionOrVar, AliasName) \
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BOOST_DLL_ALIAS_SECTIONED(FunctionOrVar, AliasName, boostdll) \
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/**/
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#if ((BOOST_COMP_GNUC && BOOST_OS_WINDOWS) || BOOST_OS_ANDROID || BOOST_COMP_IBM || defined(BOOST_DLL_FORCE_NO_WEAK_EXPORTS)) \
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&& !defined(BOOST_DLL_FORCE_ALIAS_INSTANTIATION) && !defined(BOOST_DLL_DOXYGEN)
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#define BOOST_DLL_ALIAS_SECTIONED(FunctionOrVar, AliasName, SectionName) \
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namespace _autoaliases { \
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extern "C" BOOST_SYMBOL_EXPORT const void *AliasName; \
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} /* namespace _autoaliases */ \
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/**/
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#define BOOST_DLL_AUTO_ALIAS(FunctionOrVar) \
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namespace _autoaliases { \
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extern "C" BOOST_SYMBOL_EXPORT const void *FunctionOrVar; \
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} /* namespace _autoaliases */ \
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/**/
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#else
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// Note: we can not use `aggressive_ptr_cast` here, because in that case GCC applies
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// different permissions to the section and it causes Segmentation fault.
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// Note: we can not use `boost::addressof()` here, because in that case GCC
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// may optimize away the FunctionOrVar instance and we'll get a pointer to unexisting symbol.
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/*!
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* \brief Same as \forcedmacrolink{BOOST_DLL_ALIAS} but puts alias name into the user specified section.
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*
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* \param FunctionOrVar Function or variable for which an alias must be made.
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* \param AliasName Name of the alias. Must be a valid C identifier.
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* \param SectionName Name of the section. Must be a valid C identifier without quotes not longer than 8 bytes.
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*
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* \b Example:
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* \code
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* namespace foo {
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* void bar(std::string&);
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*
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* BOOST_DLL_ALIAS_SECTIONED(foo::bar, foo_bar, sect_1) // section "sect_1" now exports "foo_bar"
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* }
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* \endcode
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*
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*/
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#define BOOST_DLL_ALIAS_SECTIONED(FunctionOrVar, AliasName, SectionName) \
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namespace _autoaliases { \
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extern "C" BOOST_SYMBOL_EXPORT const void *AliasName; \
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BOOST_DLL_SECTION(SectionName, read) BOOST_DLL_SELECTANY \
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const void * AliasName = reinterpret_cast<const void*>(reinterpret_cast<intptr_t>( \
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&FunctionOrVar \
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)); \
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} /* namespace _autoaliases */ \
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/**/
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/*!
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* \brief Exports variable or function with unmangled alias name.
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*
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* This macro is useful in cases of long mangled C++ names. For example some `void boost::foo(std::string)`
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* function name will change to something like `N5boostN3foosE` after mangling.
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* Importing function by `N5boostN3foosE` name does not looks user friendly, especially assuming the fact
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* that different compilers have different mangling schemes.*
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*
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* Must be used in scope where FunctionOrVar declared. FunctionOrVar must be a valid C name, which means that
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* it must not contain `::`.
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*
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* Functions or variables
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* in global namespace must not have names same as FunctionOrVar.
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*
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* Puts all the aliases into the \b "boostdll" read only section of the binary. Almost same as
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* \forcedmacrolink{BOOST_DLL_ALIAS}(FunctionOrVar, FunctionOrVar).
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*
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* \param FunctionOrVar Function or variable for which an unmangled alias must be made.
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*
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* \b Example:
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* \code
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* namespace foo {
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* void bar(std::string&);
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* BOOST_DLL_AUTO_ALIAS(bar)
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* }
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*
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* \endcode
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*
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* \b See: \forcedmacrolink{BOOST_DLL_ALIAS} for making an alias with different names.
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*/
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#define BOOST_DLL_AUTO_ALIAS(FunctionOrVar) \
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namespace _autoaliases { \
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BOOST_DLL_SELECTANY const void * dummy_ ## FunctionOrVar \
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= reinterpret_cast<const void*>(reinterpret_cast<intptr_t>( \
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&FunctionOrVar \
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)); \
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extern "C" BOOST_SYMBOL_EXPORT const void *FunctionOrVar; \
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BOOST_DLL_SECTION(boostdll, read) BOOST_DLL_SELECTANY \
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const void * FunctionOrVar = dummy_ ## FunctionOrVar; \
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} /* namespace _autoaliases */ \
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/**/
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#endif
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}} // namespace boost::dll
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#endif // BOOST_DLL_ALIAS_HPP
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