Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/llvm/lib/DebugInfo/PDB/Native/SymbolStream.cpp

@@ -0,0 +1,46 @@
+//===- SymbolStream.cpp - PDB Symbol Stream Access ------------------------===//
+//
+//                     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/Native/SymbolStream.h"
+
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
+#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
+#include "llvm/Support/BinaryStreamReader.h"
+#include "llvm/Support/Endian.h"
+
+using namespace llvm;
+using namespace llvm::msf;
+using namespace llvm::support;
+using namespace llvm::pdb;
+
+SymbolStream::SymbolStream(std::unique_ptr<MappedBlockStream> Stream)
+    : Stream(std::move(Stream)) {}
+
+SymbolStream::~SymbolStream() {}
+
+Error SymbolStream::reload() {
+  BinaryStreamReader Reader(*Stream);
+
+  if (auto EC = Reader.readArray(SymbolRecords, Stream->getLength()))
+    return EC;
+
+  return Error::success();
+}
+
+iterator_range<codeview::CVSymbolArray::Iterator>
+SymbolStream::getSymbols(bool *HadError) const {
+  return llvm::make_range(SymbolRecords.begin(HadError), SymbolRecords.end());
+}
+
+Error SymbolStream::commit() { return Error::success(); }
+
+codeview::CVSymbol SymbolStream::readRecord(uint32_t Offset) const {
+  return *SymbolRecords.at(Offset);
+}