Add StructuredData plugin type; showcase with new DarwinLog feature

See docs/structured_data/StructuredDataPlugins.md for details.

differential review: https://reviews.llvm.org/D22976

reviewers: clayborg, jingham
llvm-svn: 279198

1 files changed, 36 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteClientBase.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteClientBase.cpp
index 786d80176c6..fde38037d9a 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteClientBase.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteClientBase.cpp
@@ -11,6 +11,7 @@
 
 #include "llvm/ADT/StringExtras.h"
 
+#include "lldb/Target/Process.h"
 #include "lldb/Target/UnixSignals.h"
 #include "lldb/Utility/LLDBAssert.h"
 
@@ -100,6 +101,41 @@ GDBRemoteClientBase::SendContinuePacketAndWaitForResponse(ContinueDelegate &dele
             case 'A':
                 delegate.HandleAsyncMisc(llvm::StringRef(response.GetStringRef()).substr(1));
                 break;
+
+            case 'J':
+                // Asynchronous JSON packet, destined for a
+                // StructuredDataPlugin.
+            {
+                // Parse the content into a StructuredData instance.
+                auto payload_index = strlen("JSON-async:");
+                StructuredData::ObjectSP json_sp =
+                    StructuredData::ParseJSON(response.GetStringRef()
+                                              .substr(payload_index));
+                if (log)
+                {
+                    if (json_sp)
+                        log->Printf(
+                                    "GDBRemoteCommmunicationClientBase::%s() "
+                                    "received Async StructuredData packet: %s",
+                                    __FUNCTION__,
+                                    response.GetStringRef().
+                                    substr(payload_index).c_str());
+                    else
+                        log->Printf("GDBRemoteCommmunicationClientBase::%s"
+                                    "() received StructuredData packet:"
+                                    " parse failure", __FUNCTION__);
+                }
+
+                // Pass the data to the process to route to the
+                // appropriate plugin.  The plugin controls what happens
+                // to it from there.
+                bool routed = delegate.HandleAsyncStructuredData(json_sp);
+                if (log)
+                    log->Printf("GDBRemoteCommmunicationClientBase::%s()"
+                                " packet %s", __FUNCTION__,
+                                routed ? "handled" : "not handled");
+                break;
+            }
             case 'T':
             case 'S':
                 // Do this with the continue lock held.