[DWARF] NFC: DWARFDataExtractor combines relocs with DataExtractor.

Requires callers to directly associate relocations with a DataExtractor
used to read data from a DWARF section, which helps a callee not make
assumptions about which section it is reading.
This is the next step in reducing DWARFFormValue's dependence on DWARFUnit.

Differential Revision: https://reviews.llvm.org/D34704

llvm-svn: 306699

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDataExtractor.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDataExtractor.cpp
new file mode 100644
index 00000000000..001097e56c7
--- /dev/null
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDataExtractor.cpp
@@ -0,0 +1,24 @@
+//===- DWARFDataExtractor.cpp ---------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
+
+using namespace llvm;
+
+uint64_t DWARFDataExtractor::getRelocatedValue(uint32_t Size, uint32_t *Off,
+                                               uint64_t *SecNdx) const {
+  if (!RelocMap)
+    return getUnsigned(Off, Size);
+  RelocAddrMap::const_iterator AI = RelocMap->find(*Off);
+  if (AI == RelocMap->end())
+    return getUnsigned(Off, Size);
+  if (SecNdx)
+    *SecNdx = AI->second.SectionIndex;
+  return getUnsigned(Off, Size) + AI->second.Value;
+}