jasonmolenda added a comment.

`Process::ReadModuleFromMemory()` takes a FileSpec and header address in memory 
(and a size to read, default 512 bytes).  It calls through 
`Module::GetMemoryObjectFile`.  That reads the 512 bytes of memory into a 
buffer and calls `ObjectFile::FindPlugin` class method for finding the correct 
plugin (via PluginManager's ObjectFileCreateMemoryInstance methods), finally 
hitting something like `ObjectFileMachO::CreateMemoryInstance`.

It looks like `ObjectContainer` is currently a pure virtual class; we'd need to 
add a base class method `FindPlugin` for working with a memory module.  Process 
would need a `Process::ReadObjectContainerFromMemory()` or something?  Not sure 
if that's the right idea - but we don't know what kind of container it is when 
we have a Process and a header address in memory.



================
Comment at: 
lldb/source/Plugins/ObjectContainer/Mach-O-Fileset/ObjectContainerMachOFileset.cpp:201
+            : ObjectFile::MapFileData(m_file, header_and_lc_size, m_offset);
+    m_data.SetData(data_sp, m_offset, header_and_lc_size);
+  }
----------------
This started with a memory buffer of the mach header in m_data, now we've read 
the mach header and the load commands. It seems like we should replace the 
original data buffer with the memory we just read.  A quick look at 
`ObjectFileMachO::ParseHeader()`, it replaces the entire m_data.


================
Comment at: 
lldb/source/Plugins/ObjectContainer/Mach-O-Fileset/ObjectContainerMachOFileset.cpp:255
+  uint32_t filetype = data.GetU32(&offset);
+  return filetype == llvm::MachO::MH_FILESET;
+}
----------------
This file has a `using` at the top, don't need to qualify the constant.  
(there's a handful of other instances, I note one of them)


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D132433/new/

https://reviews.llvm.org/D132433

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