Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/lib/DebugInfo/PDB/DIA/DIAEnumDebugStreams.cpp

@@ -0,0 +1,54 @@
+//==- DIAEnumDebugStreams.cpp - DIA Debug Stream Enumerator impl -*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/PDB/DIA/DIAEnumDebugStreams.h"
+#include "llvm/DebugInfo/PDB/DIA/DIADataStream.h"
+#include "llvm/DebugInfo/PDB/PDBSymbol.h"
+
+using namespace llvm;
+using namespace llvm::pdb;
+
+DIAEnumDebugStreams::DIAEnumDebugStreams(
+    CComPtr<IDiaEnumDebugStreams> DiaEnumerator)
+    : Enumerator(DiaEnumerator) {}
+
+uint32_t DIAEnumDebugStreams::getChildCount() const {
+  LONG Count = 0;
+  return (S_OK == Enumerator->get_Count(&Count)) ? Count : 0;
+}
+
+std::unique_ptr<IPDBDataStream>
+DIAEnumDebugStreams::getChildAtIndex(uint32_t Index) const {
+  CComPtr<IDiaEnumDebugStreamData> Item;
+  VARIANT VarIndex;
+  VarIndex.vt = VT_I4;
+  VarIndex.lVal = Index;
+  if (S_OK != Enumerator->Item(VarIndex, &Item))
+    return nullptr;
+
+  return std::unique_ptr<IPDBDataStream>(new DIADataStream(Item));
+}
+
+std::unique_ptr<IPDBDataStream> DIAEnumDebugStreams::getNext() {
+  CComPtr<IDiaEnumDebugStreamData> Item;
+  ULONG NumFetched = 0;
+  if (S_OK != Enumerator->Next(1, &Item, &NumFetched))
+    return nullptr;
+
+  return std::unique_ptr<IPDBDataStream>(new DIADataStream(Item));
+}
+
+void DIAEnumDebugStreams::reset() { Enumerator->Reset(); }
+
+DIAEnumDebugStreams *DIAEnumDebugStreams::clone() const {
+  CComPtr<IDiaEnumDebugStreams> EnumeratorClone;
+  if (S_OK != Enumerator->Clone(&EnumeratorClone))
+    return nullptr;
+  return new DIAEnumDebugStreams(EnumeratorClone);
+}