building on the new CallGraphSCC abstraction, teach CallGraphSCCPassManager
to keep the node entries in scc_iterator up to date instead of dangling as
the SCC mutates.
This is a really terrible problem which was causing -g to affect codegen
because it would permute the memory image of the compiler process.
Thanks to Dale for expertly hunting it down.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101565 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/IPA/CallGraphSCCPass.cpp b/lib/Analysis/IPA/CallGraphSCCPass.cpp
index f5d24f0..7b73c5d 100644
--- a/lib/Analysis/IPA/CallGraphSCCPass.cpp
+++ b/lib/Analysis/IPA/CallGraphSCCPass.cpp
@@ -417,6 +417,11 @@
Nodes[i] = New;
break;
}
+
+ // Update the active scc_iterator so that it doesn't contain dangling
+ // pointers to the old CallGraphNode.
+ scc_iterator<CallGraph*> *CGI = (scc_iterator<CallGraph*>*)Context;
+ CGI->ReplaceNode(Old, New);
}