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

1 files changed, 170 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/DebugInfo/CodeView/CodeViewRecordIO.h b/clang-r353983/include/llvm/DebugInfo/CodeView/CodeViewRecordIO.h
new file mode 100644
index 00000000..b2476f16
--- /dev/null
+++ b/clang-r353983/include/llvm/DebugInfo/CodeView/CodeViewRecordIO.h
@@ -0,0 +1,170 @@
+//===- CodeViewRecordIO.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_CODEVIEWRECORDIO_H
+#define LLVM_DEBUGINFO_CODEVIEW_CODEVIEWRECORDIO_H
+
+#include "llvm/ADT/APSInt.h"
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/CodeView/CodeViewError.h"
+#include "llvm/DebugInfo/CodeView/TypeRecord.h"
+#include "llvm/Support/BinaryStreamReader.h"
+#include "llvm/Support/BinaryStreamWriter.h"
+#include "llvm/Support/Error.h"
+#include <cassert>
+#include <cstdint>
+#include <type_traits>
+
+namespace llvm {
+namespace codeview {
+
+class CodeViewRecordIO {
+  uint32_t getCurrentOffset() const {
+    return (isWriting()) ? Writer->getOffset() : Reader->getOffset();
+  }
+
+public:
+  explicit CodeViewRecordIO(BinaryStreamReader &Reader) : Reader(&Reader) {}
+  explicit CodeViewRecordIO(BinaryStreamWriter &Writer) : Writer(&Writer) {}
+
+  Error beginRecord(Optional<uint32_t> MaxLength);
+  Error endRecord();
+
+  Error mapInteger(TypeIndex &TypeInd);
+
+  bool isReading() const { return Reader != nullptr; }
+  bool isWriting() const { return !isReading(); }
+
+  uint32_t maxFieldLength() const;
+
+  template <typename T> Error mapObject(T &Value) {
+    if (isWriting())
+      return Writer->writeObject(Value);
+
+    const T *ValuePtr;
+    if (auto EC = Reader->readObject(ValuePtr))
+      return EC;
+    Value = *ValuePtr;
+    return Error::success();
+  }
+
+  template <typename T> Error mapInteger(T &Value) {
+    if (isWriting())
+      return Writer->writeInteger(Value);
+
+    return Reader->readInteger(Value);
+  }
+
+  template <typename T> Error mapEnum(T &Value) {
+    if (sizeof(Value) > maxFieldLength())
+      return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
+
+    using U = typename std::underlying_type<T>::type;
+    U X;
+    if (isWriting())
+      X = static_cast<U>(Value);
+
+    if (auto EC = mapInteger(X))
+      return EC;
+    if (isReading())
+      Value = static_cast<T>(X);
+    return Error::success();
+  }
+
+  Error mapEncodedInteger(int64_t &Value);
+  Error mapEncodedInteger(uint64_t &Value);
+  Error mapEncodedInteger(APSInt &Value);
+  Error mapStringZ(StringRef &Value);
+  Error mapGuid(GUID &Guid);
+
+  Error mapStringZVectorZ(std::vector<StringRef> &Value);
+
+  template <typename SizeType, typename T, typename ElementMapper>
+  Error mapVectorN(T &Items, const ElementMapper &Mapper) {
+    SizeType Size;
+    if (isWriting()) {
+      Size = static_cast<SizeType>(Items.size());
+      if (auto EC = Writer->writeInteger(Size))
+        return EC;
+
+      for (auto &X : Items) {
+        if (auto EC = Mapper(*this, X))
+          return EC;
+      }
+    } else {
+      if (auto EC = Reader->readInteger(Size))
+        return EC;
+      for (SizeType I = 0; I < Size; ++I) {
+        typename T::value_type Item;
+        if (auto EC = Mapper(*this, Item))
+          return EC;
+        Items.push_back(Item);
+      }
+    }
+
+    return Error::success();
+  }
+
+  template <typename T, typename ElementMapper>
+  Error mapVectorTail(T &Items, const ElementMapper &Mapper) {
+    if (isWriting()) {
+      for (auto &Item : Items) {
+        if (auto EC = Mapper(*this, Item))
+          return EC;
+      }
+    } else {
+      typename T::value_type Field;
+      // Stop when we run out of bytes or we hit record padding bytes.
+      while (!Reader->empty() && Reader->peek() < 0xf0 /* LF_PAD0 */) {
+        if (auto EC = Mapper(*this, Field))
+          return EC;
+        Items.push_back(Field);
+      }
+    }
+    return Error::success();
+  }
+
+  Error mapByteVectorTail(ArrayRef<uint8_t> &Bytes);
+  Error mapByteVectorTail(std::vector<uint8_t> &Bytes);
+
+  Error padToAlignment(uint32_t Align);
+  Error skipPadding();
+
+private:
+  Error writeEncodedSignedInteger(const int64_t &Value);
+  Error writeEncodedUnsignedInteger(const uint64_t &Value);
+
+  struct RecordLimit {
+    uint32_t BeginOffset;
+    Optional<uint32_t> MaxLength;
+
+    Optional<uint32_t> bytesRemaining(uint32_t CurrentOffset) const {
+      if (!MaxLength.hasValue())
+        return None;
+      assert(CurrentOffset >= BeginOffset);
+
+      uint32_t BytesUsed = CurrentOffset - BeginOffset;
+      if (BytesUsed >= *MaxLength)
+        return 0;
+      return *MaxLength - BytesUsed;
+    }
+  };
+
+  SmallVector<RecordLimit, 2> Limits;
+
+  BinaryStreamReader *Reader = nullptr;
+  BinaryStreamWriter *Writer = nullptr;
+};
+
+} // end namespace codeview
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_CODEVIEW_CODEVIEWRECORDIO_H