1 files changed, 92 insertions, 0 deletions
diff --git a/llvm/include/llvm/DebugInfo/CodeView/ModuleDebugLineFragment.h b/llvm/include/llvm/DebugInfo/CodeView/ModuleDebugLineFragment.h
new file mode 100644
index 00000000000..19f61ce172b
--- /dev/null
+++ b/llvm/include/llvm/DebugInfo/CodeView/ModuleDebugLineFragment.h
@@ -0,0 +1,92 @@
+//===- ModuleDebugLineFragment.h --------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_CODEVIEW_MODULEDEBUGLINEFRAGMENT_H
+#define LLVM_DEBUGINFO_CODEVIEW_MODULEDEBUGLINEFRAGMENT_H
+
+#include "llvm/DebugInfo/CodeView/ModuleDebugFragment.h"
+#include "llvm/Support/BinaryStreamArray.h"
+#include "llvm/Support/BinaryStreamReader.h"
+#include "llvm/Support/Error.h"
+
+namespace llvm {
+namespace codeview {
+
+// Corresponds to the `CV_DebugSLinesHeader_t` structure.
+struct LineFragmentHeader {
+  support::ulittle32_t RelocOffset;  // Code offset of line contribution.
+  support::ulittle16_t RelocSegment; // Code segment of line contribution.
+  support::ulittle16_t Flags;        // See LineFlags enumeration.
+  support::ulittle32_t CodeSize;     // Code size of this line contribution.
+};
+
+// Corresponds to the `CV_DebugSLinesFileBlockHeader_t` structure.
+struct LineBlockFragmentHeader {
+  support::ulittle32_t NameIndex; // Index in DBI name buffer of filename.
+  support::ulittle32_t NumLines;  // Number of lines
+  support::ulittle32_t BlockSize; // Code size of block, in bytes.
+  // The following two variable length arrays appear immediately after the
+  // header.  The structure definitions follow.
+  // LineNumberEntry   Lines[NumLines];
+  // ColumnNumberEntry Columns[NumLines];
+};
+
+// Corresponds to `CV_Line_t` structure
+struct LineNumberEntry {
+  support::ulittle32_t Offset; // Offset to start of code bytes for line number
+  support::ulittle32_t Flags;  // Start:24, End:7, IsStatement:1
+};
+
+// Corresponds to `CV_Column_t` structure
+struct ColumnNumberEntry {
+  support::ulittle16_t StartColumn;
+  support::ulittle16_t EndColumn;
+};
+
+struct LineColumnEntry {
+  support::ulittle32_t NameIndex;
+  FixedStreamArray<LineNumberEntry> LineNumbers;
+  FixedStreamArray<ColumnNumberEntry> Columns;
+};
+
+class LineColumnExtractor {
+public:
+  typedef const LineFragmentHeader ContextType;
+
+  static Error extract(BinaryStreamRef Stream, uint32_t &Len,
+                       LineColumnEntry &Item, const LineFragmentHeader *Header);
+};
+
+class ModuleDebugLineFragment final : public ModuleDebugFragment {
+  friend class LineColumnExtractor;
+  typedef VarStreamArray<LineColumnEntry, LineColumnExtractor> LineInfoArray;
+  typedef LineInfoArray::Iterator Iterator;
+
+public:
+  ModuleDebugLineFragment();
+
+  static bool classof(const ModuleDebugFragment *S) {
+    return S->kind() == ModuleDebugFragmentKind::Lines;
+  }
+
+  Error initialize(BinaryStreamReader Reader);
+
+  Iterator begin() const { return LinesAndColumns.begin(); }
+  Iterator end() const { return LinesAndColumns.end(); }
+
+  const LineFragmentHeader *header() const { return Header; }
+
+private:
+  const LineFragmentHeader *Header = nullptr;
+  LineInfoArray LinesAndColumns;
+};
+}
+}
+
+#endif