Sketch out a DWARF parser.

This introduces a new library to LLVM: libDebugInfo. It will provide debug information
parsing to LLVM. Much of the design and some of the code is taken from the LLDB project.

It also contains an llvm-dwarfdump tool that can dump the abbrevs and DIEs from an
object file. It can be used to write tests for DWARF input and output easily.

llvm-svn: 139627

1 files changed, 71 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/DWARFDebugAbbrev.h b/llvm/lib/DebugInfo/DWARFDebugAbbrev.h
new file mode 100644
index 00000000000..eaa79a10144
--- /dev/null
+++ b/llvm/lib/DebugInfo/DWARFDebugAbbrev.h
@@ -0,0 +1,71 @@
+//===-- DWARFDebugAbbrev.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_DWARFDEBUGABBREV_H
+#define LLVM_DEBUGINFO_DWARFDEBUGABBREV_H
+
+#include "DWARFAbbreviationDeclaration.h"
+#include <list>
+#include <map>
+#include <vector>
+
+namespace llvm {
+
+typedef std::vector<DWARFAbbreviationDeclaration>
+  DWARFAbbreviationDeclarationColl;
+typedef DWARFAbbreviationDeclarationColl::iterator
+  DWARFAbbreviationDeclarationCollIter;
+typedef DWARFAbbreviationDeclarationColl::const_iterator
+  DWARFAbbreviationDeclarationCollConstIter;
+
+class DWARFAbbreviationDeclarationSet {
+  uint64_t Offset;
+  uint32_t IdxOffset;
+  std::vector<DWARFAbbreviationDeclaration> Decls;
+  public:
+  DWARFAbbreviationDeclarationSet()
+    : Offset(0), IdxOffset(0) {}
+
+  DWARFAbbreviationDeclarationSet(uint64_t offset, uint32_t idxOffset)
+    : Offset(offset), IdxOffset(idxOffset) {}
+
+  void clear() {
+    IdxOffset = 0;
+    Decls.clear();
+  }
+  uint64_t getOffset() const { return Offset; }
+  void dump(raw_ostream &OS) const;
+  bool extract(DataExtractor data, uint32_t* offset_ptr);
+
+  const DWARFAbbreviationDeclaration *
+    getAbbreviationDeclaration(uint32_t abbrCode) const;
+};
+
+typedef std::map<uint64_t, DWARFAbbreviationDeclarationSet>
+  DWARFAbbreviationDeclarationCollMap;
+typedef DWARFAbbreviationDeclarationCollMap::iterator
+  DWARFAbbreviationDeclarationCollMapIter;
+typedef DWARFAbbreviationDeclarationCollMap::const_iterator
+  DWARFAbbreviationDeclarationCollMapConstIter;
+
+class DWARFDebugAbbrev {
+public:
+  DWARFDebugAbbrev();
+  const DWARFAbbreviationDeclarationSet *
+    getAbbreviationDeclarationSet(uint64_t cu_abbr_offset) const;
+  void dump(raw_ostream &OS) const;
+  void parse(DataExtractor data);
+protected:
+  DWARFAbbreviationDeclarationCollMap m_abbrevCollMap;
+  mutable DWARFAbbreviationDeclarationCollMapConstIter m_prev_abbr_offset_pos;
+};
+
+}
+
+#endif