Make WriteConstants() more robust against stray values in ValueEnumerator's ValueList

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93270 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 26c922a7810cd3a1cf63858f83689678a3fc9249..fd1bade8f15d152eaefa0b553ee7a47ba9a9e46c 100644 (file)
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -688,6 +688,11 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
       Record.clear();
       continue;
     }
+
+    // Ignore all values in ValueList except for Constants.
+    if (V && (isa<Instruction>(V) || isa<Argument>(V)))
+      continue;
+
     const Constant *C = cast<Constant>(V);
     unsigned Code = -1U;
     unsigned AbbrevToUse = 0;