Great to hear you are working on an open source OpenCL C compiler. ARM,
Intel and Apple are open-sourcing changes to Clang to support OpenCL C, so
you should be able to build on these in your work.
So I am asking for a way to avoid writing the source code given by the
application to a temporary file, that is then read by Clang.
If I understand you correctly, you refer to initialising the source manager
clang::FileManager file_mgr = ...;
clang::SourceManager src_mgr = ...;
const std::string tmp_file_path = ...;
const clang::FileEntry * src_file = file_mgr.getFile(tmp_file_path);
llvm.errs() << "Error: Failed to open file \'" << tmp_file_path <<
If, however, the source code is provided as a character string, e.g.
// Note that 'length' can be > strlen('source'), i.e.
// 'source' can contain '\0' at a position < 'length'.
size_t length = ...;
const char * source = ...;
assert( NULL != source && 0 <= length );
you can do something liek this:
// Wrapping 'source' in std::string solves the above
// issue (at a cost of copying).
const std::string source_string(source, length);
const llvm::StringRef data(source_string);
const llvm::StringRef name("<source>");
llvm::MemoryBuffer * mem = llvm::MemoryBuffer::getMemBuffer(data, name);
Hope this helps.