Be backward compatible

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48268 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp
index 27b5189d20daccc3f2be28db87122c1516b60e2c..a58ead5f14c4e35bd396b8b617131e2b4df665e4 100644 (file)
--- a/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1075,6 +1075,7 @@ bool BitcodeReader::ParseModule(const std::string &ModuleID) {
         FunctionsWithBodies.push_back(Func);
       break;
     }
+    // ALIAS: [alias type, aliasee val#, linkage]
     // ALIAS: [alias type, aliasee val#, linkage, visibility]
     case bitc::MODULE_CODE_ALIAS: {
       if (Record.size() < 3)
@@ -1085,7 +1086,9 @@ bool BitcodeReader::ParseModule(const std::string &ModuleID) {
       
       GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]),
                                            "", 0, TheModule);
-      NewGA->setVisibility(GetDecodedVisibility(Record[3]));
+      // Old bitcode files didn't have visibility field.
+      if (Record.size() > 3)
+        NewGA->setVisibility(GetDecodedVisibility(Record[3]));
       ValueList.push_back(NewGA);
       AliasInits.push_back(std::make_pair(NewGA, Record[1]));
       break;