[llvm] [DebugInfo] Helper method for finding the deepest inlining location (PR #161696)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-ir

@llvm/pr-subscribers-debuginfo

Author: Akshay Deodhar (akshayrdeodhar)

<details>
<summary>Changes</summary>

DebugInfoMetadata.h has a way to reach the scope of the deepest caller location, but not to the location itself. Having it is handy for debugging and debug printing. 

---
Full diff: https://github.com/llvm/llvm-project/pull/161696.diff


1 Files Affected:

- (modified) llvm/include/llvm/IR/DebugInfoMetadata.h (+12-3) 


``````````diff
diff --git a/llvm/include/llvm/IR/DebugInfoMetadata.h b/llvm/include/llvm/IR/DebugInfoMetadata.h
index 6652e303a6648..d63e71d246fe0 100644
--- a/llvm/include/llvm/IR/DebugInfoMetadata.h
+++ b/llvm/include/llvm/IR/DebugInfoMetadata.h
@@ -2600,14 +2600,23 @@ class DILocation : public MDNode {
   StringRef getDirectory() const { return getScope()->getDirectory(); }
   std::optional<StringRef> getSource() const { return getScope()->getSource(); }
 
+
+  /// Get the location where this is inlined
+  ///
+  /// Walk through \a getInlinedAt() and return the \a DILocation where this is inlined.
+  DILocation *getInlinedAtLocation() const {
+    DILocation *Current = this, Next = nullptr;
+    while (Next = Current->getInlinedAt())
+      Current = Next;
+    return Current;
+  }
+
   /// Get the scope where this is inlined.
   ///
   /// Walk through \a getInlinedAt() and return \a getScope() from the deepest
   /// location.
   DILocalScope *getInlinedAtScope() const {
-    if (auto *IA = getInlinedAt())
-      return IA->getInlinedAtScope();
-    return getScope();
+    return getInlinedAtLocation()->getScope();
   }
 
   /// Get the DWARF discriminator.

``````````

</details>


https://github.com/llvm/llvm-project/pull/161696