<rdar://problem/15172417>

Added two new GDB server packets to debugserver: "QSaveRegisterState" and "QRestoreRegiterState".

"QSaveRegisterState" makes the remote GDB server save all register values and it returns a save identifier as an unsigned integer. This packet can be used prior to running expressions to save all registers.

All registers can them we later restored with "QRestoreRegiterState:SAVEID" what SAVEID is the integer identifier that was returned from the call to QSaveRegisterState.

Cleaned up redundant code in lldb_private::Thread, lldb_private::ThreadPlanCallFunction.
Moved the lldb_private::Thread::RegisterCheckpoint into its own header file and it is now in the lldb_private namespace. Trimmed down the RegisterCheckpoint class to omit stuff that wasn't used (the stack ID).

Added a few new virtual methods to lldb_private::RegisterContext that allow subclasses to efficiently save/restore register states and changed the RegisterContextGDBRemote to take advantage of these new calls.

llvm-svn: 194621

1 files changed, 12 insertions, 0 deletions

diff --git a/lldb/tools/debugserver/source/MacOSX/MachThread.cpp b/lldb/tools/debugserver/source/MacOSX/MachThread.cpp
index c11d2c2ca82..f3a9d51c808 100644
--- a/lldb/tools/debugserver/source/MacOSX/MachThread.cpp
+++ b/lldb/tools/debugserver/source/MacOSX/MachThread.cpp
@@ -617,6 +617,18 @@ MachThread::SetRegisterContext (const void *buf, nub_size_t buf_len)
 }
 
 uint32_t
+MachThread::SaveRegisterState ()
+{
+    return m_arch_ap->SaveRegisterState();
+    
+}
+bool
+MachThread::RestoreRegisterState (uint32_t save_id)
+{
+    return m_arch_ap->RestoreRegisterState(save_id);
+}
+
+uint32_t
 MachThread::EnableHardwareBreakpoint (const DNBBreakpoint *bp)
 {
     if (bp != NULL && bp->IsBreakpoint())