Object: Fix Mach-O relocation printing.

There were two problems that made llvm-objdump -r crash:
- for non-scattered relocations, the symbol/section index is actually in the
  (aptly named) symbolnum field.
- sections are 1-indexed.

llvm-svn: 181843

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index af14c72..654af08 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -339,7 +339,7 @@ static void printRelocationTargetName(const MachOObjectFile *O,
 
   StringRef S;
   bool isExtern = O->getPlainRelocationExternal(RE);
-  uint64_t Val = O->getAnyRelocationAddress(RE);
+  uint64_t Val = O->getPlainRelocationSymbolNum(RE);
 
   if (isExtern) {
     symbol_iterator SI = O->begin_symbols();
@@ -347,7 +347,8 @@ static void printRelocationTargetName(const MachOObjectFile *O,
     SI->getName(S);
   } else {
     section_iterator SI = O->begin_sections();
-    advanceTo(SI, Val);
+    // Adjust for the fact that sections are 1-indexed.
+    advanceTo(SI, Val - 1);
     SI->getName(S);
   }