Add the ability for an SBValue to create a persisted version of itself.

Such a persisted version is equivalent to evaluating the value via the expression evaluator, and holding on to the $n result of the expression, except this API can be used on SBValues that do not obviously come from an expression (e.g. are the result of a memory lookup)

Expose this via SBValue::Persist() in our public API layer, and ValueObject::Persist() in the lldb_private layer

Includes testcase

Fixes rdar://19136664

llvm-svn: 223711

1 files changed, 13 insertions, 0 deletions

diff --git a/lldb/source/API/SBValue.cpp b/lldb/source/API/SBValue.cpp
index f56013a03e0..f8c75eb351c 100644
--- a/lldb/source/API/SBValue.cpp
+++ b/lldb/source/API/SBValue.cpp
@@ -1892,3 +1892,16 @@ SBValue::WatchPointee (bool resolve_location, bool read, bool write, SBError &er
         sb_watchpoint = Dereference().Watch (resolve_location, read, write, error);
     return sb_watchpoint;
 }
+
+lldb::SBValue
+SBValue::Persist ()
+{
+    ValueLocker locker;
+    lldb::ValueObjectSP value_sp(GetSP(locker));
+    SBValue persisted_sb;
+    if (value_sp)
+    {
+        persisted_sb.SetSP(value_sp->Persist());
+    }
+    return persisted_sb;
+}