krisb added inline comments.
================ Comment at: llvm/test/Instrumentation/InstrProfiling/debug-info-correlate.ll:23 call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 12345678, i32 2, i32 0) - ret void + ret void, !dbg !17 } ---------------- ellis wrote: > krisb wrote: > > ellis wrote: > > > I asked the same question in D113741, but why is this test changed? > > Normally, we emit function-local entities iff a parent function has > > location information. This is done the same way for local variables, > > labels, parameters, imported entities, and, //now,// for static locals as > > well. > > Before this change static locals behaved more like global variables and get > > emitted doesn't matter its parent function. This patch makes them handled > > more like local variables. > > > > I believe either the call or the 'ret' (or, likely, both) had had > > DILocation attached originally, but it has been removed to simplify the > > test. > I just checked and the `llvm.instrprof.increment` intrinsic does not have > debug info attached. I think you're right that I removed debug info from the > `ret` instruction to simplify the test. > > This is a special case where a global and its debug info is synthesized. > https://github.com/llvm/llvm-project/blob/23c2bedfd93cfacc62009425c464e659a34e92e6/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp#L976-L1001 > > So I don't understand why this added debug info is necessary. Does the test > fail otherwise? Right, the test would fail w/o the added DILocation, because `__profc_foo` variable (which is function-local 'global' technically) would not be emitted. With this patch we emit function-local entities if and only if the parent function has LexicalScope defined (see createAndAddScopeChildren() and its call from constructSubprogramScopeDIE()), otherwise we skip emitting all function's children (including function-local 'globals'). Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D125693/new/ https://reviews.llvm.org/D125693 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
