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b53eeb6f4c
Summary: Added a pair of APIs for encoding/decoding the 3 components of a DWARF discriminator described in http://lists.llvm.org/pipermail/llvm-dev/2016-October/106532.html: the base discriminator, the duplication factor (useful in profile-guided optimization) and the copy index (used to identify copies of code in cases like loop unrolling) The encoding packs 3 unsigned values in 32 bits. This CL addresses 2 issues: - communicates overflow back to the user - supports encoding all 3 components together. Current APIs assume a sequencing of events. For example, creating a new discriminator based on an existing one by changing the base discriminator was not supported. Reviewers: davidxl, danielcdh, wmi, dblaikie Reviewed By: dblaikie Subscribers: zzheng, dmgreen, aprantl, JDevlieghere, llvm-commits Differential Revision: https://reviews.llvm.org/D55681 llvm-svn: 349973