Introduce DWARFDataExtractor for 64-Bit DWARF parsing

Review: http://llvm-reviews.chandlerc.com/D2007
llvm-svn: 193368

1 files changed, 30 insertions, 0 deletions

diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDataExtractor.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDataExtractor.cpp
new file mode 100644
index 00000000000..9bf47cd7a9a
--- /dev/null
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDataExtractor.cpp
@@ -0,0 +1,30 @@
+//===-- DWARFDataExtractor.cpp ----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DWARFDataExtractor.h"
+
+namespace lldb_private {
+
+uint64_t
+DWARFDataExtractor::GetDWARFInitialLength(lldb::offset_t *offset_ptr) const
+{
+    uint64_t length = GetU32(offset_ptr);
+    m_is_dwarf64 = (length == UINT32_MAX);
+    if (m_is_dwarf64)
+        length = GetU64(offset_ptr);
+    return length;
+}
+
+dw_offset_t
+DWARFDataExtractor::GetDWARFOffset(lldb::offset_t *offset_ptr) const
+{
+    return GetMaxU64(offset_ptr, m_is_dwarf64 ? 8 : 4);
+}
+
+}