https://llvm.org/bugs/show_bug.cgi?id=27284
Bug ID: 27284
Summary: Reverse the ownership between DICompileUnit and
DISubprogram
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: DebugInfo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 16187
--> https://llvm.org/bugs/attachment.cgi?id=16187&action=edit
a python script that updates LLVM IR testcases to the new format
Currently each Function points to a DISubprogram and DISubprogram has a scope
field. For member functions the scope is a DICompositeType. DIScopes never
point to the DICompileUnit to facilitate type uniquing.
Distinct DISubprograms (with isDefinition: true) are not part of the type
hierarchy and cannot be uniqued. I'm proposing to remove the subprograms list
from DICompileUnit and instead add a pointer to the owning compile unit to
distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded
DISubprograms and their transitively referenced debug info.
Motivation
----------
Materializing DISubprograms is currently the most expensive operation when
doing a ThinLTO build of clang.
We want the DISubprogram to be stored in a separate Bitcode block (or the same
block as the function body) so we can avoid having to expensively deserialize
all DISubprograms together with the global metadata. If a function has been
inlined into another subprogram we need to store a reference the block
containing the inlined subprogram.
Implementation
--------------
Attached is a python script that updates LLVM IR testcases to the new format.
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