[PATCH] D80369: [DebugInfo][CallSites] Remove decl subprograms from 'retainedTypes:'

[Adrian Prantl via Phabricator via cfe-commits]

aprantl added a comment.

> How does this data get used for Swift code and ObjC interoperability? At the moment I see no use of this IR metadata in LLVM. Does ObjC/Swift interop use the DI IR over in the Swift compiler? Got a link to the code there?

Are you saying the retained types are not emitted in DWARF?
[Assuming the types do show up in the DWARF sections of the the fat .pcm files —] Swift has a component called ClangImporter that reads Clang ASTs and generates Swift ASTs to provide Swift <-> (Objective-)C interoperability. In the debugger, we don't want to have to depend on the availability of C headers (and the associated brittleness of include paths) just to realize mixed Swift-Objective-C types. Since LLDB already knows how to create Clang ASTs from DWARF, we read the types from DWARF build a Clang AST hand that over to the ClangImporter in LLDB's embedded Swift compiler and thus realize Clang-imported Swift types.


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  https://reviews.llvm.org/D80369/new/

https://reviews.llvm.org/D80369