forked from OSchip/llvm-project
f65cfff605
Summary: This patch removes manual location list handling in the statistics code and replaces it with the new DWARFDie api, which provides access to a "cooked" location list. This has the following effects: - the code now properly handles split-dwarf location lists - it will automatically support dwarf5 location lists once support for those is added - it properly handles location lists with base address selection entries - it fixes a bug where the location list code was using the first DW_AT_ranges range as a "base address" of the compile unit (it should have used DW_AT_low_pc instead. The effect of this was that the computation of the start address of a variable in its scope was broken for these kinds of compile units. This only manifested itself on linked files, since in object files the first DW_AT_ranges range normally starts at 0. Since pretty much every kind of location list was broken in some way, it's hard to verify that the new implementation is correct -- the output will be different in all non-trivial cases, and mostly with good reason. Most of the existing statistics tests continue to pass though, and a visual inspection of the statistics for non-trivial inputs shows that the data is more "reasonable" now. I have updated the "dwo statistics" test to include the new numbers, as the previous ones were completely bogus, and I have added a targeted test for the "base address" bug. Reviewers: dblaikie, cmtice, vsk Subscribers: aprantl, SouraVX, JDevlieghere, djtodoro, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D70444 |
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README.txt
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