MI support for '-var-create $regname' command.

Summary:
This command is currently processed using expression evaluation, meaning the variable binds to the result of the expression not the register.
Therefore any subsequent calls to '-var-assign' will not update the register. Fixed by detecting '$' prefix for registers according to specification.

Thanks, Ewan

Patch from ewan@codeplay.com

Reviewers: EwanCrawford

Subscribers: lldb-commits, deepak2427

Differential Revision: http://reviews.llvm.org/D8965

llvm-svn: 235195

1 files changed, 16 insertions, 6 deletions

diff --git a/lldb/tools/lldb-mi/MICmdCmdVar.cpp b/lldb/tools/lldb-mi/MICmdCmdVar.cpp
index 5ec2a69571a..dd3f196c363 100644
--- a/lldb/tools/lldb-mi/MICmdCmdVar.cpp
+++ b/lldb/tools/lldb-mi/MICmdCmdVar.cpp
@@ -177,13 +177,23 @@ CMICmdCmdVarCreate::Execute(void)
     lldb::SBThread thread = (nThreadId != UINT64_MAX) ? sbProcess.GetThreadByIndexID(nThreadId) : sbProcess.GetSelectedThread();
     m_nThreadId = thread.GetIndexID();
     lldb::SBFrame frame = bCurrentFrame ? thread.GetSelectedFrame() : thread.GetFrameAtIndex(nFrame);
+    lldb::SBValue value;
+
+    if (rStrExpression[0] == '$')
+    {
+        const CMIUtilString rStrRegister(rStrExpression.substr(1).c_str());
+        value = frame.FindRegister(rStrRegister.c_str());
+    }
+    else
+    {
+        const bool bArgs = true;
+        const bool bLocals = true;
+        const bool bStatics = true;
+        const bool bInScopeOnly = false;
+        const lldb::SBValueList valueList = frame.GetVariables(bArgs, bLocals, bStatics, bInScopeOnly);
+        value = valueList.GetFirstValueByName(rStrExpression.c_str());
+    }
 
-    const bool bArgs = true;
-    const bool bLocals = true;
-    const bool bStatics = true;
-    const bool bInScopeOnly = false;
-    const lldb::SBValueList valueList = frame.GetVariables(bArgs, bLocals, bStatics, bInScopeOnly);
-    lldb::SBValue value = valueList.GetFirstValueByName(rStrExpression.c_str());
     if (!value.IsValid())
         value = frame.EvaluateExpression(rStrExpression.c_str());