[PATCH] D132918: [clang] Fix a crash in constant evaluation

[Kadir Cetinkaya via Phabricator via cfe-commits]

kadircet created this revision.
kadircet added reviewers: usaxena95, ilya-biryukov.
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This was showing up in our internal crash collector. I have no idea how
to test it out though, open for suggestions if there are easy paths but
otherwise I'd move forward with the patch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132918

Files:
  clang/lib/AST/ExprConstant.cpp


Index: clang/lib/AST/ExprConstant.cpp
===================================================================
--- clang/lib/AST/ExprConstant.cpp
+++ clang/lib/AST/ExprConstant.cpp
@@ -4794,6 +4794,11 @@
       Result = APValue((const FieldDecl *)nullptr);
       return true;
     }
+    // Can't access properties of an incomplete type.
+    if (!RD->hasDefinition()) {
+      Result = APValue();
+      return false;
+    }
     Result = APValue(APValue::UninitStruct(), RD->getNumBases(),
                      std::distance(RD->field_begin(), RD->field_end()));
 


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