Teach macho-dump to dump the uleb128s referred to by linkedit_data segments.

llvm-svn: 138836

1 files changed, 26 insertions, 0 deletions

diff --git a/llvm/lib/Object/MachOObject.cpp b/llvm/lib/Object/MachOObject.cpp
index 339b12043ae..9cdac8681dd 100644
--- a/llvm/lib/Object/MachOObject.cpp
+++ b/llvm/lib/Object/MachOObject.cpp
@@ -9,6 +9,7 @@
 
 #include "llvm/Object/MachOObject.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/SwapByteOrder.h"
@@ -355,6 +356,31 @@ void MachOObject::ReadSymbol64TableEntry(uint64_t SymbolTableOffset,
   ReadInMemoryStruct(*this, Buffer->getBuffer(), Offset, Res);
 }
 
+
+void MachOObject::ReadULEB128s(uint64_t Index,
+                               SmallVectorImpl<uint64_t> &Out) const {
+  const char *ptr = Buffer->getBufferStart() + Index;
+  uint64_t data = 0;
+  uint64_t delta = 0;
+  uint32_t shift = 0;
+  while (true) {
+    assert(ptr < Buffer->getBufferEnd() && "index out of bounds");
+    assert(shift < 64 && "too big for uint64_t");
+
+    uint8_t byte = *ptr++;
+    delta |= ((byte & 0x7F) << shift);
+    shift += 7;
+    if (byte < 0x80) {
+      if (delta == 0)
+        break;
+      data += delta;
+      Out.push_back(data);
+      delta = 0;
+      shift = 0;
+    }
+  }
+}
+
 /* ** */
 // Object Dumping Facilities
 void MachOObject::dump() const { print(dbgs()); dbgs() << '\n'; }