DebugInfo: provide the ability to add members to a class after it has been constructed

This is necessary to allow Clang to only emit implicit members when
there is code generated for them, rather than whenever they are ODR
used.

llvm-svn: 188082

2 files changed, 14 insertions, 0 deletions

diff --git a/llvm/include/llvm/DebugInfo.h b/llvm/include/llvm/DebugInfo.h
index 74416db2175..b02446abbbf 100644
--- a/llvm/include/llvm/DebugInfo.h
+++ b/llvm/include/llvm/DebugInfo.h
@@ -323,6 +323,7 @@ namespace llvm {
 
     DIArray getTypeArray() const { return getFieldAs<DIArray>(10); }
     void setTypeArray(DIArray Elements, DIArray TParams = DIArray());
+    void addMember(DISubprogram S);
     unsigned getRunTimeLang() const { return getUnsignedField(11); }
     DICompositeType getContainingType() const {
       return getFieldAs<DICompositeType>(12);
diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index fc9324949d0..0f7ddb5961c 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -647,6 +647,19 @@ void DICompositeType::setTypeArray(DIArray Elements, DIArray TParams) {
   DbgNode = N;
 }
 
+void DICompositeType::addMember(DISubprogram S) {
+  SmallVector<llvm::Value *, 16> M;
+  DIArray OrigM = getTypeArray();
+  unsigned Elements = OrigM.getNumElements();
+  if (Elements == 1 && !OrigM.getElement(0))
+    Elements = 0;
+  M.reserve(Elements + 1);
+  for (unsigned i = 0; i != Elements; ++i)
+    M.push_back(OrigM.getElement(i));
+  M.push_back(S);
+  setTypeArray(DIArray(MDNode::get(DbgNode->getContext(), M)));
+}
+
 /// \brief Set the containing type.
 void DICompositeType::setContainingType(DICompositeType ContainingType) {
   TrackingVH<MDNode> N(*this);