[clang] [Clang] Fix null pointer dereference in enum debug info generation (PR #105556)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-debuginfo

Author: None (smanna12)

<details>
<summary>Changes</summary>

This commit adds an assertion to the CreateTypeDefinition function in CGDebugInfo.cpp to verify that an enumeration definition (ED) is available before iterating over its enumerators. This prevents potential null pointer dereferences and ensures that the function operates on a valid enumeration definition.

---
Full diff: https://github.com/llvm/llvm-project/pull/105556.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/CGDebugInfo.cpp (+1) 


``````````diff
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 7ad3088f0ab756..dc83d596e3cb06 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3561,6 +3561,7 @@ llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
 
   SmallVector<llvm::Metadata *, 16> Enumerators;
   ED = ED->getDefinition();
+  assert(ED && "An enumeration definition is required");
   for (const auto *Enum : ED->enumerators()) {
     Enumerators.push_back(
         DBuilder.createEnumerator(Enum->getName(), Enum->getInitVal()));

``````````

</details>


https://github.com/llvm/llvm-project/pull/105556