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271 lines
12 KiB
271 lines
12 KiB
/* C++ compatible function declaration macros. |
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Copyright (C) 2010-2011 Free Software Foundation, Inc. |
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This program is free software: you can redistribute it and/or modify it |
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under the terms of the GNU General Public License as published |
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by the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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#ifndef _GL_CXXDEFS_H |
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#define _GL_CXXDEFS_H |
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/* The three most frequent use cases of these macros are: |
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* For providing a substitute for a function that is missing on some |
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platforms, but is declared and works fine on the platforms on which |
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it exists: |
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#if @GNULIB_FOO@ |
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# if !@HAVE_FOO@ |
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_GL_FUNCDECL_SYS (foo, ...); |
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# endif |
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_GL_CXXALIAS_SYS (foo, ...); |
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_GL_CXXALIASWARN (foo); |
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#elif defined GNULIB_POSIXCHECK |
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... |
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#endif |
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* For providing a replacement for a function that exists on all platforms, |
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but is broken/insufficient and needs to be replaced on some platforms: |
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#if @GNULIB_FOO@ |
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# if @REPLACE_FOO@ |
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# if !(defined __cplusplus && defined GNULIB_NAMESPACE) |
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# undef foo |
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# define foo rpl_foo |
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# endif |
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_GL_FUNCDECL_RPL (foo, ...); |
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_GL_CXXALIAS_RPL (foo, ...); |
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# else |
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_GL_CXXALIAS_SYS (foo, ...); |
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# endif |
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_GL_CXXALIASWARN (foo); |
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#elif defined GNULIB_POSIXCHECK |
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... |
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#endif |
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* For providing a replacement for a function that exists on some platforms |
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but is broken/insufficient and needs to be replaced on some of them and |
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is additionally either missing or undeclared on some other platforms: |
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#if @GNULIB_FOO@ |
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# if @REPLACE_FOO@ |
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# if !(defined __cplusplus && defined GNULIB_NAMESPACE) |
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# undef foo |
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# define foo rpl_foo |
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# endif |
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_GL_FUNCDECL_RPL (foo, ...); |
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_GL_CXXALIAS_RPL (foo, ...); |
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# else |
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# if !@HAVE_FOO@ or if !@HAVE_DECL_FOO@ |
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_GL_FUNCDECL_SYS (foo, ...); |
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# endif |
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_GL_CXXALIAS_SYS (foo, ...); |
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# endif |
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_GL_CXXALIASWARN (foo); |
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#elif defined GNULIB_POSIXCHECK |
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... |
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#endif |
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*/ |
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/* _GL_EXTERN_C declaration; |
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performs the declaration with C linkage. */ |
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#if defined __cplusplus |
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# define _GL_EXTERN_C extern "C" |
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#else |
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# define _GL_EXTERN_C extern |
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#endif |
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/* _GL_FUNCDECL_RPL (func, rettype, parameters_and_attributes); |
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declares a replacement function, named rpl_func, with the given prototype, |
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consisting of return type, parameters, and attributes. |
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Example: |
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_GL_FUNCDECL_RPL (open, int, (const char *filename, int flags, ...) |
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_GL_ARG_NONNULL ((1))); |
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*/ |
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#define _GL_FUNCDECL_RPL(func,rettype,parameters_and_attributes) \ |
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_GL_FUNCDECL_RPL_1 (rpl_##func, rettype, parameters_and_attributes) |
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#define _GL_FUNCDECL_RPL_1(rpl_func,rettype,parameters_and_attributes) \ |
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_GL_EXTERN_C rettype rpl_func parameters_and_attributes |
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/* _GL_FUNCDECL_SYS (func, rettype, parameters_and_attributes); |
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declares the system function, named func, with the given prototype, |
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consisting of return type, parameters, and attributes. |
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Example: |
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_GL_FUNCDECL_SYS (open, int, (const char *filename, int flags, ...) |
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_GL_ARG_NONNULL ((1))); |
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*/ |
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#define _GL_FUNCDECL_SYS(func,rettype,parameters_and_attributes) \ |
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_GL_EXTERN_C rettype func parameters_and_attributes |
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/* _GL_CXXALIAS_RPL (func, rettype, parameters); |
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declares a C++ alias called GNULIB_NAMESPACE::func |
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that redirects to rpl_func, if GNULIB_NAMESPACE is defined. |
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Example: |
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_GL_CXXALIAS_RPL (open, int, (const char *filename, int flags, ...)); |
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*/ |
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#define _GL_CXXALIAS_RPL(func,rettype,parameters) \ |
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_GL_CXXALIAS_RPL_1 (func, rpl_##func, rettype, parameters) |
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#if defined __cplusplus && defined GNULIB_NAMESPACE |
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# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \ |
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namespace GNULIB_NAMESPACE \ |
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{ \ |
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rettype (*const func) parameters = ::rpl_func; \ |
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} \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#else |
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# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#endif |
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/* _GL_CXXALIAS_RPL_CAST_1 (func, rpl_func, rettype, parameters); |
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is like _GL_CXXALIAS_RPL_1 (func, rpl_func, rettype, parameters); |
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except that the C function rpl_func may have a slightly different |
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declaration. A cast is used to silence the "invalid conversion" error |
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that would otherwise occur. */ |
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#if defined __cplusplus && defined GNULIB_NAMESPACE |
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# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \ |
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namespace GNULIB_NAMESPACE \ |
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{ \ |
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rettype (*const func) parameters = \ |
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reinterpret_cast<rettype(*)parameters>(::rpl_func); \ |
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} \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#else |
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# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#endif |
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/* _GL_CXXALIAS_SYS (func, rettype, parameters); |
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declares a C++ alias called GNULIB_NAMESPACE::func |
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that redirects to the system provided function func, if GNULIB_NAMESPACE |
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is defined. |
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Example: |
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_GL_CXXALIAS_SYS (open, int, (const char *filename, int flags, ...)); |
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*/ |
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#if defined __cplusplus && defined GNULIB_NAMESPACE |
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/* If we were to write |
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rettype (*const func) parameters = ::func; |
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like above in _GL_CXXALIAS_RPL_1, the compiler could optimize calls |
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better (remove an indirection through a 'static' pointer variable), |
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but then the _GL_CXXALIASWARN macro below would cause a warning not only |
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for uses of ::func but also for uses of GNULIB_NAMESPACE::func. */ |
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# define _GL_CXXALIAS_SYS(func,rettype,parameters) \ |
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namespace GNULIB_NAMESPACE \ |
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{ \ |
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static rettype (*func) parameters = ::func; \ |
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} \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#else |
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# define _GL_CXXALIAS_SYS(func,rettype,parameters) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#endif |
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/* _GL_CXXALIAS_SYS_CAST (func, rettype, parameters); |
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is like _GL_CXXALIAS_SYS (func, rettype, parameters); |
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except that the C function func may have a slightly different declaration. |
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A cast is used to silence the "invalid conversion" error that would |
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otherwise occur. */ |
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#if defined __cplusplus && defined GNULIB_NAMESPACE |
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# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \ |
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namespace GNULIB_NAMESPACE \ |
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{ \ |
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static rettype (*func) parameters = \ |
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reinterpret_cast<rettype(*)parameters>(::func); \ |
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} \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#else |
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# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#endif |
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/* _GL_CXXALIAS_SYS_CAST2 (func, rettype, parameters, rettype2, parameters2); |
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is like _GL_CXXALIAS_SYS (func, rettype, parameters); |
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except that the C function is picked among a set of overloaded functions, |
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namely the one with rettype2 and parameters2. Two consecutive casts |
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are used to silence the "cannot find a match" and "invalid conversion" |
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errors that would otherwise occur. */ |
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#if defined __cplusplus && defined GNULIB_NAMESPACE |
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/* The outer cast must be a reinterpret_cast. |
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The inner cast: When the function is defined as a set of overloaded |
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functions, it works as a static_cast<>, choosing the designated variant. |
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When the function is defined as a single variant, it works as a |
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reinterpret_cast<>. The parenthesized cast syntax works both ways. */ |
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# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \ |
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namespace GNULIB_NAMESPACE \ |
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{ \ |
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static rettype (*func) parameters = \ |
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reinterpret_cast<rettype(*)parameters>( \ |
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(rettype2(*)parameters2)(::func)); \ |
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} \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#else |
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# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#endif |
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/* _GL_CXXALIASWARN (func); |
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causes a warning to be emitted when ::func is used but not when |
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GNULIB_NAMESPACE::func is used. func must be defined without overloaded |
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variants. */ |
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#if defined __cplusplus && defined GNULIB_NAMESPACE |
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# define _GL_CXXALIASWARN(func) \ |
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_GL_CXXALIASWARN_1 (func, GNULIB_NAMESPACE) |
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# define _GL_CXXALIASWARN_1(func,namespace) \ |
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_GL_CXXALIASWARN_2 (func, namespace) |
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/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>, |
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we enable the warning only when not optimizing. */ |
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# if !__OPTIMIZE__ |
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# define _GL_CXXALIASWARN_2(func,namespace) \ |
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_GL_WARN_ON_USE (func, \ |
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"The symbol ::" #func " refers to the system function. " \ |
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"Use " #namespace "::" #func " instead.") |
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# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING |
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# define _GL_CXXALIASWARN_2(func,namespace) \ |
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extern __typeof__ (func) func |
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# else |
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# define _GL_CXXALIASWARN_2(func,namespace) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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# endif |
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#else |
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# define _GL_CXXALIASWARN(func) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#endif |
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/* _GL_CXXALIASWARN1 (func, rettype, parameters_and_attributes); |
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causes a warning to be emitted when the given overloaded variant of ::func |
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is used but not when GNULIB_NAMESPACE::func is used. */ |
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#if defined __cplusplus && defined GNULIB_NAMESPACE |
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# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \ |
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_GL_CXXALIASWARN1_1 (func, rettype, parameters_and_attributes, \ |
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GNULIB_NAMESPACE) |
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# define _GL_CXXALIASWARN1_1(func,rettype,parameters_and_attributes,namespace) \ |
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_GL_CXXALIASWARN1_2 (func, rettype, parameters_and_attributes, namespace) |
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/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>, |
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we enable the warning only when not optimizing. */ |
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# if !__OPTIMIZE__ |
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# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \ |
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_GL_WARN_ON_USE_CXX (func, rettype, parameters_and_attributes, \ |
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"The symbol ::" #func " refers to the system function. " \ |
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"Use " #namespace "::" #func " instead.") |
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# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING |
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# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \ |
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extern __typeof__ (func) func |
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# else |
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# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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# endif |
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#else |
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# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \ |
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_GL_EXTERN_C int _gl_cxxalias_dummy |
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#endif |
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#endif /* _GL_CXXDEFS_H */
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