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# 6c7b1c62 13-Sep-2016 Reid Kleckner <[email protected]>

[DebugInfo] Deduplicate debug info limiting logic

We should be doing the same checks when a type is completed as we do
when a complete type is used during emission. Previously, we duplicated
the log

[DebugInfo] Deduplicate debug info limiting logic

We should be doing the same checks when a type is completed as we do
when a complete type is used during emission. Previously, we duplicated
the logic, and it got out of sync. This could be observed with
dllimported classes.

Also reduce a test case for this slightly.

Implementing review feedback from David Blaikie on r281057.

llvm-svn: 281278

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# c9404e10 09-Sep-2016 Reid Kleckner <[email protected]>

[codeview] Extend the heuristic for detecting classes imported from DLLs

If a dynamic class contains a dllimport method, then assume the class
may not be constructed in this DLL, and therefore the v

[codeview] Extend the heuristic for detecting classes imported from DLLs

If a dynamic class contains a dllimport method, then assume the class
may not be constructed in this DLL, and therefore the vtable will live
in a different PDB.

This heuristic is still incomplete, and will miss things like abstract
base classes that are only constructed on one side of the DLL interface.
That said, this heuristic does detect some cases that are currently
problematic, and may be useful to other projects that don't use many
DLLs.

llvm-svn: 281053

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Revision tags: llvmorg-3.9.0, llvmorg-3.9.0-rc3, llvmorg-3.9.0-rc2
# 99242984 16-Aug-2016 Adrian McCarthy <[email protected]>

Emit debug info for dynamic classes if they are imported from a DLL.

With -debug-info-kind=limited, we omit debug info for dynamic classes that live in other TUs. This reduces duplicate type informa

Emit debug info for dynamic classes if they are imported from a DLL.

With -debug-info-kind=limited, we omit debug info for dynamic classes that live in other TUs. This reduces duplicate type information. When statically linked, the type information comes together. But if your binary has a class derived from a base in a DLL, the base class info is not available to the debugger.

The decision is made in shouldOmitDefinition (CGDebugInfo.cpp). Per a suggestion from rnk, I've tweaked the decision so that we do include definitions for classes marked as DLL imports. This should be a relatively small number of classes, so we don't pay a large price for duplication of the type info, yet it should cover most cases on Windows.

Essentially this makes debug info for DLLs independent, but we still assume that all TUs within the same DLL will be consistently built with (or without) debug info and the debugger will be able to search across the debug info within that scope to resolve any declarations into definitions, etc.

llvm-svn: 278861

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