[llvm-branch-commits] [llvm] [llvm-profgen] Extend llvm-profgen to generate vtable profiles with data access events for non context-sensitive profiles using debug info (PR #148013)

[Mingming Liu via llvm-branch-commits]

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@@ -540,6 +540,22 @@ void ProfileGenerator::generateLineNumBasedProfile() {
   // Fill in boundary sample counts as well as call site samples for calls
   populateBoundarySamplesForAllFunctions(SC.BranchCounter);
 
+  // For each instruction with vtable accesses, get its symbolized inline
+  // stack, and add the vtable counters to the function samples.
+  for (const auto &[IpData, Count] : SC.DataAccessCounter) {
+    uint64_t InstAddr = IpData.first;
+    const SampleContextFrameVector &FrameVec =
+        Binary->getCachedFrameLocationStack(InstAddr, false);
+    if (!FrameVec.empty()) {
+      FunctionSamples &FunctionProfile =
+          getLeafProfileAndAddTotalSamples(FrameVec, 0);
+      LineLocation Loc(
+          FrameVec.back().Location.LineOffset,
+          getBaseDiscriminator(FrameVec.back().Location.Discriminator));
+      FunctionProfile.addTypeSamplesAt(Loc, FunctionId(IpData.second), Count);
+    }
+  }
+
----------------
mingmingl-llvm wrote:

The environment issue is fixed (with a manual machine restart after some system 
maintenances..) , and I can collect LBR. 
https://github.com/llvm/llvm-project/pull/148013/commits/e58708972695a0300b0472298d5eb8819d0e2928#diff-22e592380f9deced00e432033744b4bbd34f8490b5aeb6f35356e95dd51c821a
 adds a context-sensitive perf script after running 
`llvm/test/tools/llvm-profgen/Inputs/dap.bin`, and verified that `llvm-profgen` 
reports error when it sees a context-sensitive script.

https://github.com/llvm/llvm-project/pull/148013
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