Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/lib/DebugInfo/CodeView/SymbolSerializer.cpp

@@ -0,0 +1,60 @@
+//===- SymbolSerializer.cpp -----------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/CodeView/SymbolSerializer.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+#include <cassert>
+#include <cstdint>
+#include <cstring>
+
+using namespace llvm;
+using namespace llvm::codeview;
+
+SymbolSerializer::SymbolSerializer(BumpPtrAllocator &Allocator,
+                                   CodeViewContainer Container)
+    : Storage(Allocator), Stream(RecordBuffer, support::little), Writer(Stream),
+      Mapping(Writer, Container) {}
+
+Error SymbolSerializer::visitSymbolBegin(CVSymbol &Record) {
+  assert(!CurrentSymbol.hasValue() && "Already in a symbol mapping!");
+
+  Writer.setOffset(0);
+
+  if (auto EC = writeRecordPrefix(Record.kind()))
+    return EC;
+
+  CurrentSymbol = Record.kind();
+  if (auto EC = Mapping.visitSymbolBegin(Record))
+    return EC;
+
+  return Error::success();
+}
+
+Error SymbolSerializer::visitSymbolEnd(CVSymbol &Record) {
+  assert(CurrentSymbol.hasValue() && "Not in a symbol mapping!");
+
+  if (auto EC = Mapping.visitSymbolEnd(Record))
+    return EC;
+
+  uint32_t RecordEnd = Writer.getOffset();
+  uint16_t Length = RecordEnd - 2;
+  Writer.setOffset(0);
+  if (auto EC = Writer.writeInteger(Length))
+    return EC;
+
+  uint8_t *StableStorage = Storage.Allocate<uint8_t>(RecordEnd);
+  ::memcpy(StableStorage, &RecordBuffer[0], RecordEnd);
+  Record.RecordData = ArrayRef<uint8_t>(StableStorage, RecordEnd);
+  CurrentSymbol.reset();
+
+  return Error::success();
+}