Fix PR14016.

DeadArgumentElimination pass can replace one LLVM function with another,
invalidating a pointer stored in debug info metadata entry for this function.
To fix this, we collect debug info descriptors for functions before
running a DeadArgumentElimination pass and "patch" pointers in metadata nodes
if we replace a function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165490 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/VMCore/DebugInfo.cpp b/lib/VMCore/DebugInfo.cpp
index c8f8f7d67b..3029ce2734 100644
--- a/lib/VMCore/DebugInfo.cpp
+++ b/lib/VMCore/DebugInfo.cpp
@@ -111,6 +111,16 @@ Function *DIDescriptor::getFunctionField(unsigned Elt) const {
   return 0;
 }
 
+void DIDescriptor::replaceFunctionField(unsigned Elt, Function *F) {
+  if (DbgNode == 0)
+    return;
+
+  if (Elt < DbgNode->getNumOperands()) {
+    MDNode *Node = const_cast<MDNode*>(DbgNode);
+    Node->replaceOperandWith(Elt, F);
+  }
+}
+
 unsigned DIVariable::getNumAddrElements() const {
   if (getVersion() <= LLVMDebugVersion8)
     return DbgNode->getNumOperands()-6;