// Try to open an existing file. Returns false if the file doesn't
// exist, has a size of 0 or can't be mmaped. This method is
- // thread-unsafe.
+ // thread-unsafe. If BASE_NAME is not NULL, use the contents of
+ // that file as the base for incremental linking.
bool
- open_for_modification();
+ open_base_file(const char* base_name, bool writable);
// Open the output file. FILE_SIZE is the final size of the file.
// If the file already exists, it is deleted/truncated. This method
// Map the file into memory.
bool
- map_no_anonymous();
+ map_no_anonymous(bool);
// Unmap the file from memory (and flush to disk buffers).
void