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.

llvm-svn: 165490

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/include/llvm/DebugInfo.h b/llvm/include/llvm/DebugInfo.h
index 4c1d045fa0d..dae03ad1009 100644
--- a/llvm/include/llvm/DebugInfo.h
+++ b/llvm/include/llvm/DebugInfo.h
@@ -81,6 +81,7 @@ namespace llvm {
     GlobalVariable *getGlobalVariableField(unsigned Elt) const;
     Constant *getConstantField(unsigned Elt) const;
     Function *getFunctionField(unsigned Elt) const;
+    void replaceFunctionField(unsigned Elt, Function *F);
 
   public:
     explicit DIDescriptor() : DbgNode(0) {}
@@ -562,6 +563,7 @@ namespace llvm {
     bool describes(const Function *F);
 
     Function *getFunction() const { return getFunctionField(16); }
+    void replaceFunction(Function *F) { replaceFunctionField(16, F); }
     DIArray getTemplateParams() const { return getFieldAs<DIArray>(17); }
     DISubprogram getFunctionDeclaration() const {
       return getFieldAs<DISubprogram>(18);