LLVMとclangを使ってC++を実行時にコンパイルする方法を解説します
libdcompileNaomasa Matsubayashi
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int main() {!float a = 5.0f;!std::vector< boost::filesystem::path > f;!f.push_back( "hoge.cpp" );!f.push_back( "fuga.cpp" );!dcompile::dynamic_compiler dc;!dc.getLoader().enableSystemPath();!if( !dc.getLoader().load( "jpeg" ) )!throw Ouch();!dc.getHeaderPath().enableSystemPath();!dcompile::module lib = dc( f.begin(), f.end() );!boost::optional< dcompile::function > foo =!lib.getFunction( "foo" );!if( foo )!(*foo)( &a );!else!throw Ouch();!std::cout << a << " outside" << std::endl;!}
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int main() {!float a = 5.0f;!std::vector< boost::filesystem::path > f;!f.push_back( "hoge.cpp" );!f.push_back( "fuga.cpp" );!dcompile::dynamic_compiler dc;!dc.getLoader().enableSystemPath();!if( !dc.getLoader().load( "jpeg" ) )!throw Ouch();!dc.getHeaderPath().enableSystemPath();!dcompile::module lib = dc( f.begin(), f.end() );!boost::optional< dcompile::function > foo =!lib.getFunction( "foo" );!if( foo )!(*foo)( &a );!else!throw Ouch();!std::cout << a << " outside" << std::endl;!}f.push_back( "hoge.cpp" );!f.push_back( "fuga.cpp" );dcompile::dynamic_compiler dc;dc.getLoader().enableSystemPath();!if(!!dc.getLoader().load( "jpeg" ) )!throw Ouch();dc.getHeaderPath()!.enableSystemPath();dcompile::module lib =!dc( f.begin(), f.end() );boost::optionaldcompile::function!> foo = lib.getFunction( "foo" );(*foo)( &a );
#include !extern "C" void moo( float *a );!extern "C" void foo( float *a ) {!struct jpeg_compress_struct cinfo;!jpeg_create_compress( &cinfo );!moo( a );!}#include !extern "C"!void moo( float *a ) {!std::cout << *a << " inslide" << std::endl;!std::cout << "Hello, world!" << std::endl;!*a += 0.1f;!}IPHFDQQGVHBDQQ
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