compilestring.cpp

const llvm::Module&

compileString(
  std::string  source_string
) {
  std::vector<std::string> args = {
    "/usr/local/Toolchains/LLVM5.0.0.xctoolchain/usr/bin/clang++",
    "-std=c++1z",
    "-isystem", "/usr/local/Toolchains/LLVM5.0.0.xctoolchain/usr/include/c++/v1",
    "-isystem", "/usr/local/Toolchains/LLVM5.0.0.xctoolchain/usr/include",
    "-isystem", "/usr/local/Toolchains/LLVM5.0.0.xctoolchain/usr/lib/clang/5.0.0/include",
    "-isystem", "/usr/include",
    "-isystem", "/usr/local/include",
    "-isystem", "/Users/asher/Projects/strongai",
    "-isystem", "/Users/asher/Projects/strongai/test",
    "-isystem", "/virtual",
    "/virtual/source_file.cpp"
  };

  llvm::IntrusiveRefCntPtr<clang::vfs::OverlayFileSystem> OverlayFileSystem( new clang::vfs::OverlayFileSystem(clang::vfs::getRealFileSystem()) );
  llvm::IntrusiveRefCntPtr<clang::vfs::InMemoryFileSystem> InMemoryFileSystem( new clang::vfs::InMemoryFileSystem );
  OverlayFileSystem->pushOverlay( InMemoryFileSystem );
  llvm::IntrusiveRefCntPtr<clang::FileManager> Files( new clang::FileManager( clang::FileSystemOptions(), OverlayFileSystem ) );

  std::unique_ptr<clang::CodeGenAction> code_generator( new clang::EmitLLVMOnlyAction( & TheContext ) );

  clang::tooling::ToolInvocation Invocation( args, code_generator.get(), Files.get() );

  InMemoryFileSystem->addFile( "/virtual/source_file.cpp", 0, llvm::MemoryBuffer::getMemBuffer( source_string.c_str() ) );

  if ( ! Invocation.run() ) throw "Compilation failed!";

  llvm::Module& compilation_unit = *code_generator->takeModule();

  return compilation_unit;
}