DylibStubContentsScrubber (Buck)

java.lang.Object
- com.facebook.buck.cxx.toolchain.objectfile.DylibStubContentsScrubber

All Implemented Interfaces:

FileContentsScrubber, FileScrubber
```
public class DylibStubContentsScrubber
extends Object
implements FileContentsScrubber
```
Scrubs the contents of dylib stubs, so that they're independent of the contents of the source dylib. That means that if the source dylib's ABI does not change, it will produce the exact same dylib stub.
The linker itself does not actually care about the symbol addresses, it just wants to ensure any referenced symbols exist. That means we can reset the addresses to any value we would like. Note that the symbol addresses themselves are already invalid in the dylib stub, as the contents (i.e., binary instructions) have been stripped by "strip".
Dylib stubs produced by "strip" are still dependent on symbol addresses and the UUID. To make them independent, we do the following:
- Set the UUID to the same value each time
- Update the _LINKEDIT segment and remove any addresses for symbols
  - Update the exports info
  - Update the symbol table

- Nested Class Summary
  - Nested classes/interfaces inherited from interface com.facebook.buck.io.file.FileScrubber
    FileScrubber.ScrubException
- Constructor Summary
  
  Constructors
  Constructor Description
  
  DylibStubContentsScrubber()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  void scrubFile(FileChannel file)
  Override this method to perform the content modification.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DylibStubContentsScrubber
```
public DylibStubContentsScrubber()
```
- Method Detail
  - scrubFile
```
public void scrubFile(FileChannel file)
               throws IOException,
                      FileScrubber.ScrubException
```
    Description copied from interface: FileContentsScrubber
    
    Override this method to perform the content modification.
    
    Specified by:
    
    scrubFile in interface FileContentsScrubber
    
    Throws:
    
    IOException
    
    FileScrubber.ScrubException