Adrian Prantl 9b045d555b Introduce a DWARFImporter delegate that can look up clang::Decls by name. ...

Traditionally a serialized binary Swift module (as used in debug info)
can only be imported if all of its Clang dependencies can be imported
*from source*.

- Swift's ClangImporter imports Clang modules by converting Clang AST
  types into Swift AST types.

- LLDB knows how to find Clang types in DWARF or other debug info and
  can synthesize a Clang AST from that information.

This patch introduces a DWARFImporter delegate that is implemented by
LLDB to connect these two components. With this, a Clang type can be
found (by name) in the debug info and handed over to ClangImporter to
create a Swift type from it.  This path has lower fidelity than
importing the Clang modules from source, since it is missing out on
Swiftication annotations and other metadata that is not serialized in
DWARF, but it's invaluable as a fallback mechanism for the debugger
when source code for the Clang modules isn't available or the modules
are otherwise not buildable.

rdar://problem/49233932

2019-08-06 18:05:46 -07:00

5.3 KiB

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