tree 437449f1120a2105bfe51b836f6007733c60648d
parent 593716846598a3389b5d0618681f213eae49d1dd
author Reid Kleckner <rnk@google.com> 1553191354 +0000
committer Reid Kleckner <rnk@google.com> 1553191354 +0000

[llvm-pdbutil] Add -type-ref-stats to help find unused type info

Summary:
This considers module symbol streams and the global symbol stream to be
roots. Most types that this considers "unreferenced" are referenced by
LF_UDT_MOD_SRC_LINE id records, which VC seems to always include.
Essentially, they are types that the user can only find in the debugger
if they call them by name, they cannot be found by traversing a symbol.

In practice, around 80% of type information in a PDB is referenced by a
symbol. That seems like a reasonable number.

I don't really plan to do anything with this tool. It mostly just exists
for informational purposes, and to confirm that we probably don't need
to implement type reference tracking in LLD. We can continue to merge
all types as we do today without wasting space.

Reviewers: zturner, aganea

Subscribers: mgorny, hiraditya, arphaman, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59620

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356692 91177308-0d34-0410-b5e6-96231b3b80d8