diff --git a/src/plugins/debugger/debuggerengine.h b/src/plugins/debugger/debuggerengine.h
index 5009601806e..75593855e94 100644
--- a/src/plugins/debugger/debuggerengine.h
+++ b/src/plugins/debugger/debuggerengine.h
@@ -33,6 +33,7 @@
 
 #include "debugger_global.h"
 #include "debuggerconstants.h"
+#include "debuggerprotocol.h"
 #include "debuggerstartparameters.h"
 #include "threaddata.h" // For ThreadId.
 
diff --git a/src/plugins/debugger/debuggerprotocol.cpp b/src/plugins/debugger/debuggerprotocol.cpp
index 2c0281d30ca..71786bdb3b7 100644
--- a/src/plugins/debugger/debuggerprotocol.cpp
+++ b/src/plugins/debugger/debuggerprotocol.cpp
@@ -733,5 +733,124 @@ QString decodeData(const QByteArray &ba, int encoding)
     return QCoreApplication::translate("Debugger", "<Encoding error>");
 }
 
+//////////////////////////////////////////////////////////////////////////////////
+//
+// DebuggerCommand
+//
+//////////////////////////////////////////////////////////////////////////////////
+
+const DebuggerCommand &DebuggerCommand::argHelper(const char *name, const QByteArray &data) const
+{
+    args.append('"');
+    args.append(name);
+    args.append("\":");
+    args.append(data);
+    args.append(",");
+    return *this;
+}
+
+QByteArray DebuggerCommand::toData(const QList<QByteArray> &value)
+{
+    QByteArray res;
+    foreach (const QByteArray &item, value) {
+        if (!res.isEmpty())
+            res.append(',');
+        res += item;
+    }
+    return '[' + res + ']';
+}
+
+QByteArray DebuggerCommand::toData(const QHash<QByteArray, QByteArray> &value)
+{
+    QByteArray res;
+    QHashIterator<QByteArray, QByteArray> it(value);
+    while (it.hasNext()) {
+        it.next();
+        if (!res.isEmpty())
+            res.append(',');
+        res += '"' + it.key() + "\":" + it.value();
+    }
+    return '{' + res + '}';
+}
+
+const DebuggerCommand &DebuggerCommand::arg(const char *name, int value) const
+{
+    return argHelper(name, QByteArray::number(value));
+}
+
+const DebuggerCommand &DebuggerCommand::arg(const char *name, qlonglong value) const
+{
+    return argHelper(name, QByteArray::number(value));
+}
+
+const DebuggerCommand &DebuggerCommand::arg(const char *name, qulonglong value) const
+{
+    return argHelper(name, QByteArray::number(value));
+}
+
+const DebuggerCommand &DebuggerCommand::arg(const char *name, const QString &value) const
+{
+    return arg(name, value.toUtf8().data());
+}
+
+const DebuggerCommand &DebuggerCommand::arg(const char *name, const QByteArray &value) const
+{
+    return arg(name, value.data());
+}
+
+const DebuggerCommand &DebuggerCommand::arg(const char *name, const char *value) const
+{
+    args.append('"');
+    args.append(name);
+    args.append("\":\"");
+    args.append(value);
+    args.append("\",");
+    return *this;
+}
+
+const DebuggerCommand &DebuggerCommand::arg(const char *value) const
+{
+    args.append("\"");
+    args.append(value);
+    args.append("\",");
+    return *this;
+}
+
+const DebuggerCommand &DebuggerCommand::beginList(const char *name) const
+{
+    if (name) {
+        args += '"';
+        args += name;
+        args += "\":";
+    }
+    args += '[';
+    return *this;
+}
+
+void DebuggerCommand::endList() const
+{
+    if (args.endsWith(','))
+        args.chop(1);
+    args += "],";
+}
+
+const DebuggerCommand &DebuggerCommand::beginGroup(const char *name) const
+{
+    if (name) {
+        args += '"';
+        args += name;
+        args += "\":";
+    }
+    args += '{';
+    return *this;
+}
+
+void DebuggerCommand::endGroup() const
+{
+    if (args.endsWith(','))
+        args.chop(1);
+    args += "},";
+}
+
 } // namespace Internal
 } // namespace Debugger
diff --git a/src/plugins/debugger/debuggerprotocol.h b/src/plugins/debugger/debuggerprotocol.h
index bb9f2ad2dc2..459ed57003a 100644
--- a/src/plugins/debugger/debuggerprotocol.h
+++ b/src/plugins/debugger/debuggerprotocol.h
@@ -36,6 +36,34 @@
 namespace Debugger {
 namespace Internal {
 
+// Convenience structure to build up backend commands.
+class DebuggerCommand
+{
+public:
+    DebuggerCommand() {}
+    DebuggerCommand(const char *f) : function(f) {}
+
+    const DebuggerCommand &arg(const char *name) const;
+    const DebuggerCommand &arg(const char *name, int value) const;
+    const DebuggerCommand &arg(const char *name, qlonglong value) const;
+    const DebuggerCommand &arg(const char *name, qulonglong value) const;
+    const DebuggerCommand &arg(const char *name, const QString &value) const;
+    const DebuggerCommand &arg(const char *name, const QByteArray &value) const;
+    const DebuggerCommand &arg(const char *name, const char *value) const;
+    const DebuggerCommand &beginList(const char *name = 0) const;
+    void endList() const;
+    const DebuggerCommand &beginGroup(const char *name = 0) const;
+    void endGroup() const;
+
+    static QByteArray toData(const QList<QByteArray> &value);
+    static QByteArray toData(const QHash<QByteArray, QByteArray> &value);
+
+    QByteArray function;
+    mutable QByteArray args;
+private:
+    const DebuggerCommand &argHelper(const char *name, const QByteArray &value) const;
+};
+
 /*
 
 output ==>
diff --git a/src/plugins/debugger/lldb/lldbengine.cpp b/src/plugins/debugger/lldb/lldbengine.cpp
index 427e4a975ad..4a2c5981c8a 100644
--- a/src/plugins/debugger/lldb/lldbengine.cpp
+++ b/src/plugins/debugger/lldb/lldbengine.cpp
@@ -121,10 +121,10 @@ LldbEngine::~LldbEngine()
 
 void LldbEngine::executeDebuggerCommand(const QString &command, DebuggerLanguages)
 {
-    runCommand(Command("executeDebuggerCommand").arg("command", command));
+    runCommand(DebuggerCommand("executeDebuggerCommand").arg("command", command));
 }
 
-void LldbEngine::runCommand(const Command &command)
+void LldbEngine::runCommand(const DebuggerCommand &command)
 {
     QTC_ASSERT(m_lldbProc.state() == QProcess::Running, notifyEngineIll());
     ++m_lastToken;
@@ -142,7 +142,7 @@ void LldbEngine::debugLastCommand()
 void LldbEngine::shutdownInferior()
 {
     QTC_ASSERT(state() == InferiorShutdownRequested, qDebug() << state());
-    runCommand(Command("shutdownInferior"));
+    runCommand(DebuggerCommand("shutdownInferior"));
 }
 
 void LldbEngine::shutdownEngine()
@@ -283,19 +283,19 @@ void LldbEngine::setupInferior()
 
     const QString path = stringSetting(ExtraDumperFile);
     if (!path.isEmpty()) {
-        Command cmd("addExtraDumper");
+        DebuggerCommand cmd("addExtraDumper");
         cmd.arg("path", path.toUtf8());
         runCommand(cmd);
     }
 
     const QString commands = stringSetting(ExtraDumperCommands);
     if (!commands.isEmpty()) {
-        Command cmd("executeDebuggerCommand");
+        DebuggerCommand cmd("executeDebuggerCommand");
         cmd.arg("commands", commands.toUtf8());
         runCommand(cmd);
     }
 
-    Command cmd1("loadDumperFiles");
+    DebuggerCommand cmd1("loadDumperFiles");
     runCommand(cmd1);
 
     QString executable;
@@ -303,7 +303,7 @@ void LldbEngine::setupInferior()
     QtcProcess::prepareCommand(QFileInfo(sp.executable).absoluteFilePath(),
                                sp.processArgs, &executable, &args);
 
-    Command cmd("setupInferior");
+    DebuggerCommand cmd("setupInferior");
     cmd.arg("executable", executable);
     cmd.arg("breakOnMain", sp.breakOnMain);
     cmd.arg("useTerminal", sp.useTerminal);
@@ -467,7 +467,7 @@ void LldbEngine::executeRunToLine(const ContextData &data)
 {
     resetLocation();
     notifyInferiorRunRequested();
-    Command cmd("executeRunToLocation");
+    DebuggerCommand cmd("executeRunToLocation");
     cmd.arg("file", data.fileName);
     cmd.arg("line", data.lineNumber);
     cmd.arg("address", data.address);
@@ -478,14 +478,14 @@ void LldbEngine::executeRunToFunction(const QString &functionName)
 {
     resetLocation();
     notifyInferiorRunRequested();
-    runCommand(Command("executeRunToFunction").arg("function", functionName));
+    runCommand(DebuggerCommand("executeRunToFunction").arg("function", functionName));
 }
 
 void LldbEngine::executeJumpToLine(const ContextData &data)
 {
     resetLocation();
     notifyInferiorRunRequested();
-    Command cmd("executeJumpToLocation");
+    DebuggerCommand cmd("executeJumpToLocation");
     cmd.arg("file", data.fileName);
     cmd.arg("line", data.lineNumber);
     cmd.arg("address", data.address);
@@ -500,13 +500,13 @@ void LldbEngine::activateFrame(int frameIndex)
 
     const int n = stackHandler()->stackSize();
     if (frameIndex == n) {
-        Command cmd("reportStack");
+        DebuggerCommand cmd("reportStack");
         cmd.arg("stacklimit", n * 10 + 3);
         runCommand(cmd);
         return;
     }
 
-    Command cmd("activateFrame");
+    DebuggerCommand cmd("activateFrame");
     cmd.arg("index", frameIndex);
     cmd.arg("thread", threadsHandler()->currentThread().raw());
     runCommand(cmd);
@@ -517,7 +517,7 @@ void LldbEngine::activateFrame(int frameIndex)
 
 void LldbEngine::selectThread(ThreadId threadId)
 {
-    runCommand(Command("selectThread").arg("id", threadId.raw()));
+    runCommand(DebuggerCommand("selectThread").arg("id", threadId.raw()));
 }
 
 bool LldbEngine::acceptsBreakpoint(Breakpoint bp) const
@@ -525,7 +525,7 @@ bool LldbEngine::acceptsBreakpoint(Breakpoint bp) const
     return bp.parameters().isCppBreakpoint() && startParameters().startMode != AttachCore;
 }
 
-bool LldbEngine::attemptBreakpointSynchronizationHelper(Command *cmd)
+bool LldbEngine::attemptBreakpointSynchronizationHelper(DebuggerCommand *cmd)
 {
     BreakHandler *handler = breakHandler();
 
@@ -620,7 +620,7 @@ void LldbEngine::attemptBreakpointSynchronization()
         return;
     }
 
-    Command cmd("handleBreakpoints");
+    DebuggerCommand cmd("handleBreakpoints");
     if (!attemptBreakpointSynchronizationHelper(&cmd)) {
         showMessage(_("BREAKPOINTS ARE NOT FULLY SYNCHRONIZED"));
         runCommand(cmd);
@@ -781,7 +781,7 @@ void LldbEngine::refreshModules(const GdbMi &modules)
 
 void LldbEngine::requestModuleSymbols(const QString &moduleName)
 {
-    runCommand(Command("listSymbols").arg("module", moduleName));
+    runCommand(DebuggerCommand("listSymbols").arg("module", moduleName));
 }
 
 void LldbEngine::refreshSymbols(const GdbMi &symbols)
@@ -839,14 +839,14 @@ void LldbEngine::updateAll()
 
 void LldbEngine::reloadFullStack()
 {
-    Command cmd("reportStack");
+    DebuggerCommand cmd("reportStack");
     cmd.arg("stacklimit", -1);
     runCommand(cmd);
 }
 
 void LldbEngine::updateStack()
 {
-    Command cmd("reportStack");
+    DebuggerCommand cmd("reportStack");
     cmd.arg("stacklimit", action(MaximalStackDepth)->value().toInt());
     runCommand(cmd);
 }
@@ -861,7 +861,7 @@ void LldbEngine::assignValueInDebugger(const Internal::WatchData *data,
     const QString &expression, const QVariant &value)
 {
     Q_UNUSED(data);
-    Command cmd("assignValue");
+    DebuggerCommand cmd("assignValue");
     cmd.arg("exp", expression.toLatin1().toHex());
     cmd.arg("value", value.toString().toLatin1().toHex());
     runCommand(cmd);
@@ -884,7 +884,7 @@ void LldbEngine::doUpdateLocals(UpdateParameters params)
 {
     WatchHandler *handler = watchHandler();
 
-    Command cmd("updateData");
+    DebuggerCommand cmd("updateData");
     cmd.arg("expanded", handler->expansionRequests());
     cmd.arg("typeformats", handler->typeFormatRequests());
     cmd.arg("formats", handler->individualFormatRequests());
@@ -1187,7 +1187,7 @@ void LldbEngine::fetchDisassembler(DisassemblerAgent *agent)
         m_disassemblerAgents.insert(p, id);
     }
     const Location &loc = agent->location();
-    Command cmd("disassemble");
+    DebuggerCommand cmd("disassemble");
     cmd.arg("cookie", id);
     cmd.arg("address", loc.address());
     cmd.arg("function", loc.functionName());
@@ -1209,7 +1209,7 @@ void LldbEngine::fetchMemory(MemoryAgent *agent, QObject *editorToken,
         m_memoryAgents.insert(agent, id);
     }
     m_memoryAgentTokens.insert(id, editorToken);
-    Command cmd("fetchMemory");
+    DebuggerCommand cmd("fetchMemory");
     cmd.arg("address", addr);
     cmd.arg("length", length);
     cmd.arg("cookie", id);
@@ -1225,7 +1225,7 @@ void LldbEngine::changeMemory(MemoryAgent *agent, QObject *editorToken,
         m_memoryAgents.insert(agent, id);
         m_memoryAgentTokens.insert(id, editorToken);
     }
-    Command cmd("writeMemory");
+    DebuggerCommand cmd("writeMemory");
     cmd.arg("address", addr);
     cmd.arg("data", data.toHex());
     cmd.arg("cookie", id);
@@ -1234,7 +1234,7 @@ void LldbEngine::changeMemory(MemoryAgent *agent, QObject *editorToken,
 
 void LldbEngine::setRegisterValue(const QByteArray &name, const QString &value)
 {
-    runCommand(Command("setRegister").arg("name", name).arg("value", value));
+    runCommand(DebuggerCommand("setRegister").arg("name", name).arg("value", value));
 }
 
 
@@ -1296,125 +1296,6 @@ void LldbEngine::notifyEngineRemoteSetupFinished(const RemoteSetupResult &result
     }
 }
 
-///////////////////////////////////////////////////////////////////////
-//
-// Command
-//
-///////////////////////////////////////////////////////////////////////
-
-const LldbEngine::Command &LldbEngine::Command::argHelper(const char *name, const QByteArray &data) const
-{
-    args.append('"');
-    args.append(name);
-    args.append("\":");
-    args.append(data);
-    args.append(",");
-    return *this;
-}
-
-QByteArray LldbEngine::Command::toData(const QList<QByteArray> &value)
-{
-    QByteArray res;
-    foreach (const QByteArray &item, value) {
-        if (!res.isEmpty())
-            res.append(',');
-        res += item;
-    }
-    return '[' + res + ']';
-}
-
-QByteArray LldbEngine::Command::toData(const QHash<QByteArray, QByteArray> &value)
-{
-    QByteArray res;
-    QHashIterator<QByteArray, QByteArray> it(value);
-    while (it.hasNext()) {
-        it.next();
-        if (!res.isEmpty())
-            res.append(',');
-        res += '"' + it.key() + "\":" + it.value();
-    }
-    return '{' + res + '}';
-}
-
-const LldbEngine::Command &LldbEngine::Command::arg(const char *name, int value) const
-{
-    return argHelper(name, QByteArray::number(value));
-}
-
-const LldbEngine::Command &LldbEngine::Command::arg(const char *name, qlonglong value) const
-{
-    return argHelper(name, QByteArray::number(value));
-}
-
-const LldbEngine::Command &LldbEngine::Command::arg(const char *name, qulonglong value) const
-{
-    return argHelper(name, QByteArray::number(value));
-}
-
-const LldbEngine::Command &LldbEngine::Command::arg(const char *name, const QString &value) const
-{
-    return arg(name, value.toUtf8().data());
-}
-
-const LldbEngine::Command &LldbEngine::Command::arg(const char *name, const QByteArray &value) const
-{
-    return arg(name, value.data());
-}
-
-const LldbEngine::Command &LldbEngine::Command::arg(const char *name, const char *value) const
-{
-    args.append('"');
-    args.append(name);
-    args.append("\":\"");
-    args.append(value);
-    args.append("\",");
-    return *this;
-}
-
-const LldbEngine::Command &LldbEngine::Command::arg(const char *value) const
-{
-    args.append("\"");
-    args.append(value);
-    args.append("\",");
-    return *this;
-}
-
-const LldbEngine::Command &LldbEngine::Command::beginList(const char *name) const
-{
-    if (name) {
-        args += '"';
-        args += name;
-        args += "\":";
-    }
-    args += '[';
-    return *this;
-}
-
-void LldbEngine::Command::endList() const
-{
-    if (args.endsWith(','))
-        args.chop(1);
-    args += "],";
-}
-
-const LldbEngine::Command &LldbEngine::Command::beginGroup(const char *name) const
-{
-    if (name) {
-        args += '"';
-        args += name;
-        args += "\":";
-    }
-    args += '{';
-    return *this;
-}
-
-void LldbEngine::Command::endGroup() const
-{
-    if (args.endsWith(','))
-        args.chop(1);
-    args += "},";
-}
-
 void LldbEngine::stubStarted()
 {
     startLldb();
diff --git a/src/plugins/debugger/lldb/lldbengine.h b/src/plugins/debugger/lldb/lldbengine.h
index dd20dfebb9c..479fdbb0323 100644
--- a/src/plugins/debugger/lldb/lldbengine.h
+++ b/src/plugins/debugger/lldb/lldbengine.h
@@ -66,33 +66,6 @@ public:
     ~LldbEngine();
 
 private:
-    // Convenience struct to build up backend commands.
-    struct Command
-    {
-        Command() {}
-        Command(const char *f) : function(f) {}
-
-        const Command &arg(const char *name) const;
-        const Command &arg(const char *name, int value) const;
-        const Command &arg(const char *name, qlonglong value) const;
-        const Command &arg(const char *name, qulonglong value) const;
-        const Command &arg(const char *name, const QString &value) const;
-        const Command &arg(const char *name, const QByteArray &value) const;
-        const Command &arg(const char *name, const char *value) const;
-        const Command &beginList(const char *name = 0) const;
-        void endList() const;
-        const Command &beginGroup(const char *name = 0) const;
-        void endGroup() const;
-
-        static QByteArray toData(const QList<QByteArray> &value);
-        static QByteArray toData(const QHash<QByteArray, QByteArray> &value);
-
-        QByteArray function;
-        mutable QByteArray args;
-        private:
-        const Command &argHelper(const char *name, const QByteArray &value) const;
-    };
-
     // DebuggerEngine implementation
     void executeStep();
     void executeStepOut();
@@ -124,7 +97,7 @@ private:
 
     bool acceptsBreakpoint(Breakpoint bp) const;
     void attemptBreakpointSynchronization();
-    bool attemptBreakpointSynchronizationHelper(Command *command);
+    bool attemptBreakpointSynchronizationHelper(DebuggerCommand *command);
 
     void assignValueInDebugger(const WatchData *data,
         const QString &expr, const QVariant &value);
@@ -200,9 +173,9 @@ private:
     void handleChildren(const WatchData &data0, const GdbMi &item,
         QList<WatchData> *list);
 
-    void runCommand(const Command &cmd);
+    void runCommand(const DebuggerCommand &cmd);
     void debugLastCommand();
-    Command m_lastDebuggableCommand;
+    DebuggerCommand m_lastDebuggableCommand;
 
     QByteArray m_inbuffer;
     QString m_scriptFileName;