Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 120 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/DebugInfo/CodeView/CVRecord.h b/clang-r353983/include/llvm/DebugInfo/CodeView/CVRecord.h
new file mode 100644
index 00000000..1df3d16e
--- /dev/null
+++ b/clang-r353983/include/llvm/DebugInfo/CodeView/CVRecord.h
@@ -0,0 +1,120 @@
+//===- CVRecord.h -----------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H
+#define LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/DebugInfo/CodeView/CodeViewError.h"
+#include "llvm/DebugInfo/CodeView/RecordSerialization.h"
+#include "llvm/DebugInfo/CodeView/TypeIndex.h"
+#include "llvm/Support/BinaryStreamReader.h"
+#include "llvm/Support/BinaryStreamRef.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+#include <cstdint>
+
+namespace llvm {
+
+namespace codeview {
+
+template <typename Kind> class CVRecord {
+public:
+  CVRecord() : Type(static_cast<Kind>(0)) {}
+
+  CVRecord(Kind K, ArrayRef<uint8_t> Data) : Type(K), RecordData(Data) {}
+
+  bool valid() const { return Type != static_cast<Kind>(0); }
+
+  uint32_t length() const { return RecordData.size(); }
+  Kind kind() const { return Type; }
+  ArrayRef<uint8_t> data() const { return RecordData; }
+  StringRef str_data() const {
+    return StringRef(reinterpret_cast<const char *>(RecordData.data()),
+                     RecordData.size());
+  }
+
+  ArrayRef<uint8_t> content() const {
+    return RecordData.drop_front(sizeof(RecordPrefix));
+  }
+
+  Kind Type;
+  ArrayRef<uint8_t> RecordData;
+};
+
+template <typename Kind> struct RemappedRecord {
+  explicit RemappedRecord(const CVRecord<Kind> &R) : OriginalRecord(R) {}
+
+  CVRecord<Kind> OriginalRecord;
+  SmallVector<std::pair<uint32_t, TypeIndex>, 8> Mappings;
+};
+
+template <typename Record, typename Func>
+Error forEachCodeViewRecord(ArrayRef<uint8_t> StreamBuffer, Func F) {
+  while (!StreamBuffer.empty()) {
+    if (StreamBuffer.size() < sizeof(RecordPrefix))
+      return make_error<CodeViewError>(cv_error_code::corrupt_record);
+
+    const RecordPrefix *Prefix =
+        reinterpret_cast<const RecordPrefix *>(StreamBuffer.data());
+
+    size_t RealLen = Prefix->RecordLen + 2;
+    if (StreamBuffer.size() < RealLen)
+      return make_error<CodeViewError>(cv_error_code::corrupt_record);
+
+    ArrayRef<uint8_t> Data = StreamBuffer.take_front(RealLen);
+    StreamBuffer = StreamBuffer.drop_front(RealLen);
+
+    Record R(static_cast<decltype(Record::Type)>((uint16_t)Prefix->RecordKind),
+             Data);
+    if (auto EC = F(R))
+      return EC;
+  }
+  return Error::success();
+}
+
+/// Read a complete record from a stream at a random offset.
+template <typename Kind>
+inline Expected<CVRecord<Kind>> readCVRecordFromStream(BinaryStreamRef Stream,
+                                                       uint32_t Offset) {
+  const RecordPrefix *Prefix = nullptr;
+  BinaryStreamReader Reader(Stream);
+  Reader.setOffset(Offset);
+
+  if (auto EC = Reader.readObject(Prefix))
+    return std::move(EC);
+  if (Prefix->RecordLen < 2)
+    return make_error<CodeViewError>(cv_error_code::corrupt_record);
+  Kind K = static_cast<Kind>(uint16_t(Prefix->RecordKind));
+
+  Reader.setOffset(Offset);
+  ArrayRef<uint8_t> RawData;
+  if (auto EC = Reader.readBytes(RawData, Prefix->RecordLen + sizeof(uint16_t)))
+    return std::move(EC);
+  return codeview::CVRecord<Kind>(K, RawData);
+}
+
+} // end namespace codeview
+
+template <typename Kind>
+struct VarStreamArrayExtractor<codeview::CVRecord<Kind>> {
+  Error operator()(BinaryStreamRef Stream, uint32_t &Len,
+                   codeview::CVRecord<Kind> &Item) {
+    auto ExpectedRec = codeview::readCVRecordFromStream<Kind>(Stream, 0);
+    if (!ExpectedRec)
+      return ExpectedRec.takeError();
+    Item = *ExpectedRec;
+    Len = ExpectedRec->length();
+    return Error::success();
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H