[PseudoProbe] Do not force the calliste debug loc to inlined probes from __nodebug__ functions.

For pseudo probes we would like to keep their original dwarf discriminator (either a zero or null) until the first FS-discriminator pass. The inliner is a violation of that, given that it assigns inlinee instructions with no debug info with the that of the callsite. This is being disabled in this patch.

Reviewed By: wenlei

Differential Revision: https://reviews.llvm.org/D151568

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Utils/InlineFunction.cpp b/llvm/lib/Transforms/Utils/InlineFunction.cpp
index b372a24..a433c83 100644
--- a/llvm/lib/Transforms/Utils/InlineFunction.cpp
+++ b/llvm/lib/Transforms/Utils/InlineFunction.cpp
@@ -1636,6 +1636,12 @@ static void fixupLineNumbers(Function *Fn, Function::iterator FI,
         if (allocaWouldBeStaticInEntry(AI))
           continue;
 
+      // Do not force a debug loc for pseudo probes, since they do not need to
+      // be debuggable, and also they are expected to have a zero/null dwarf
+      // discriminator at this point which could be violated otherwise.
+      if (isa<PseudoProbeInst>(BI))
+        continue;
+
       BI->setDebugLoc(TheCallDL);
     }