<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, 16 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
index d5535bbb1df..530655bab6e 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
@@ -411,6 +411,21 @@ public:
     HarmonizeThreadIdsForProfileData (ProcessGDBRemote *process,
                                       StringExtractorGDBRemote &inputStringExtractor);
 
+    bool
+    ReadRegister(lldb::tid_t tid,
+                 uint32_t reg_num,
+                 StringExtractorGDBRemote &response);
+
+    bool
+    ReadAllRegisters (lldb::tid_t tid,
+                      StringExtractorGDBRemote &response);
+
+    bool
+    SaveRegisterState (lldb::tid_t tid, uint32_t &save_id);
+    
+    bool
+    RestoreRegisterState (lldb::tid_t tid, uint32_t save_id);
+    
 protected:
 
     bool
@@ -438,6 +453,7 @@ protected:
     lldb_private::LazyBool m_attach_or_wait_reply;
     lldb_private::LazyBool m_prepare_for_reg_writing_reply;
     lldb_private::LazyBool m_supports_p;
+    lldb_private::LazyBool m_supports_QSaveRegisterState;
     
     bool
         m_supports_qProcessInfoPID:1,