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78e228c700
Fix a set of related bugs: * Considering two locations as equivalent when their lines are the same but their scopes are different causes erroneous debug info that attributes a commoned call to be attributed to one of the two calls it was commoned from. * The previous code to compute a new location's scope was inaccurate and would use the inlinedAt that was the /parent/ of the inlinedAt that is the nearest common one, and also used that parent scope instead of the nearest common scope. * Not generating new locations generally seemed like a lower quality choice There was some risk that generating more new locations could hurt object size by making more fine grained line table entries, but it looks like that was offset by the decrease in line table (& address & ranges) size caused by more accurately computing the scope - which likely lead to fewer range entries (more contiguous ranges) & reduced size that way. All up with these changes I saw minor reductions (-1.21%, -1.77%) in .rela.debug_ranges and .rela.debug_addr (in a fission, compressed debug info build) as well as other minor size changes (generally reductinos) across the board (-1.32% debug_info.dwo, -1.28% debug_loc.dwo). Measured in an optimized (-O2) build of the clang binary. If you are investigating a size regression in an optimized debug builds, this is certainly a patch to look into - and I'd be happy to look into any major regressions found & see what we can do to address them. llvm-svn: 340583 |
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