Fixed ValueObject::UpdateValueIfNeeded to keep

track of the checksum of the object so we can
track if it is modified.  This fixes a testcase
(test/expression_command/issue_11588) on OS X.

Patch by Enrico Granata.

llvm-svn: 223830

1 files changed, 25 insertions, 1 deletions

diff --git a/lldb/source/Core/DataExtractor.cpp b/lldb/source/Core/DataExtractor.cpp
index 27dccfe5cf2..6e1d63095cf 100644
--- a/lldb/source/Core/DataExtractor.cpp
+++ b/lldb/source/Core/DataExtractor.cpp
@@ -22,7 +22,7 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/MathExtras.h"
-
+#include "llvm/Support/MD5.h"
 
 #include "lldb/Core/DataBufferHeap.h"
 #include "lldb/Core/DataExtractor.h"
@@ -2238,3 +2238,27 @@ DataExtractor::Append(void* buf, offset_t length)
     
     return true;
 }
+
+void
+DataExtractor::Checksum (llvm::SmallVectorImpl<uint8_t> &dest,
+                         uint64_t max_data)
+{
+    if (max_data == 0)
+        max_data = GetByteSize();
+    else
+        max_data = std::min(max_data, GetByteSize());
+
+    llvm::MD5 md5;
+
+    const llvm::ArrayRef<uint8_t> data(GetDataStart(),max_data);
+    md5.update(data);
+
+    llvm::MD5::MD5Result result;
+    md5.final(result);
+
+    dest.resize(16);
+    std::copy(result,
+              result+16,
+              dest.begin());
+}
+