1 files changed, 102 insertions, 0 deletions
diff --git a/clang-r353983e/include/llvm/DebugInfo/CodeView/DebugSubsectionRecord.h b/clang-r353983e/include/llvm/DebugInfo/CodeView/DebugSubsectionRecord.h
new file mode 100644
index 00000000..bcb379f0
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+++ b/clang-r353983e/include/llvm/DebugInfo/CodeView/DebugSubsectionRecord.h
@@ -0,0 +1,102 @@
+//===- DebugSubsectionRecord.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_DEBUGSUBSECTIONRECORD_H
+#define LLVM_DEBUGINFO_CODEVIEW_DEBUGSUBSECTIONRECORD_H
+
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/Support/BinaryStreamArray.h"
+#include "llvm/Support/BinaryStreamRef.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MathExtras.h"
+#include <cstdint>
+#include <memory>
+
+namespace llvm {
+
+class BinaryStreamWriter;
+
+namespace codeview {
+
+class DebugSubsection;
+
+// Corresponds to the `CV_DebugSSubsectionHeader_t` structure.
+struct DebugSubsectionHeader {
+  support::ulittle32_t Kind;   // codeview::DebugSubsectionKind enum
+  support::ulittle32_t Length; // number of bytes occupied by this record.
+};
+
+class DebugSubsectionRecord {
+public:
+  DebugSubsectionRecord();
+  DebugSubsectionRecord(DebugSubsectionKind Kind, BinaryStreamRef Data,
+                        CodeViewContainer Container);
+
+  static Error initialize(BinaryStreamRef Stream, DebugSubsectionRecord &Info,
+                          CodeViewContainer Container);
+
+  uint32_t getRecordLength() const;
+  DebugSubsectionKind kind() const;
+  BinaryStreamRef getRecordData() const;
+
+private:
+  CodeViewContainer Container = CodeViewContainer::ObjectFile;
+  DebugSubsectionKind Kind = DebugSubsectionKind::None;
+  BinaryStreamRef Data;
+};
+
+class DebugSubsectionRecordBuilder {
+public:
+  DebugSubsectionRecordBuilder(std::shared_ptr<DebugSubsection> Subsection,
+                               CodeViewContainer Container);
+
+  /// Use this to copy existing subsections directly from source to destination.
+  /// For example, line table subsections in an object file only need to be
+  /// relocated before being copied into the PDB.
+  DebugSubsectionRecordBuilder(const DebugSubsectionRecord &Contents,
+                               CodeViewContainer Container);
+
+  uint32_t calculateSerializedLength();
+  Error commit(BinaryStreamWriter &Writer) const;
+
+private:
+  /// The subsection to build. Will be null if Contents is non-empty.
+  std::shared_ptr<DebugSubsection> Subsection;
+
+  /// The bytes of the subsection. Only non-empty if Subsection is null.
+  DebugSubsectionRecord Contents;
+
+  CodeViewContainer Container;
+};
+
+} // end namespace codeview
+
+template <> struct VarStreamArrayExtractor<codeview::DebugSubsectionRecord> {
+  Error operator()(BinaryStreamRef Stream, uint32_t &Length,
+                   codeview::DebugSubsectionRecord &Info) {
+    // FIXME: We need to pass the container type through to this function.  In
+    // practice this isn't super important since the subsection header describes
+    // its length and we can just skip it.  It's more important when writing.
+    if (auto EC = codeview::DebugSubsectionRecord::initialize(
+            Stream, Info, codeview::CodeViewContainer::Pdb))
+      return EC;
+    Length = alignTo(Info.getRecordLength(), 4);
+    return Error::success();
+  }
+};
+
+namespace codeview {
+
+using DebugSubsectionArray = VarStreamArray<DebugSubsectionRecord>;
+
+} // end namespace codeview
+
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_CODEVIEW_DEBUGSUBSECTIONRECORD_H