Add comment explaining what is lower level analysis pass.
llvm-svn: 46658
GitOrigin-RevId: 8df7cc1119f6613336b5281921341c6f83a90c6f
diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index ae73373..5620d0f 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -921,6 +921,16 @@
TPM->dumpArguments();
TPM->dumpPasses();
}
+
+ // Module Level pass may required Function Level analysis info
+ // (e.g. dominator info). Pass manager uses on the fly function pass manager
+ // to provide this on demand. In that case, in Pass manager terminology,
+ // module level pass is requiring lower level analysis info managed by
+ // lower level pass manager.
+
+ // When Pass manager is not able to order required analysis info, Pass manager
+ // checks whether any lower level manager will be able to provide this
+ // analysis info on demand or not.
assert (0 && "Unable to handle Pass that requires lower level Analysis pass");
}
