Various improvements to CliContext.

- CliContext now tracks the current stack trace and frame if applicable.

- CliContext now carries a value node manager. This allows it to track
  the variables in the currently active frame.

src/apps/debugger/user_interface/cli/CliContext.cpp

@@ -1,4 +1,5 @@
 /*
+ * Copyright 2012, Rene Gollent, rene@gollent.com.
  * Copyright 2012, Ingo Weinhold, ingo_weinhold@gmx.de.
  * Distributed under the terms of the MIT License.
  */
@@ -9,8 +10,9 @@
 #include <AutoDeleter.h>
 #include <AutoLocker.h>
 
+#include "StackTrace.h"
 #include "UserInterface.h"
-
+#include "ValueNodeManager.h"
 
 // NOTE: This is a simple work-around for EditLine not having any kind of user
 // data field. Hence in _GetPrompt() we don't have access to the context object.
@@ -55,6 +57,7 @@ CliContext::CliContext()
 	fLock("CliContext"),
 	fTeam(NULL),
 	fListener(NULL),
+	fNodeManager(NULL),
 	fEditLine(NULL),
 	fHistory(NULL),
 	fPrompt(NULL),
@@ -63,7 +66,9 @@ CliContext::CliContext()
 	fEventsOccurred(0),
 	fInputLoopWaiting(false),
 	fTerminating(false),
-	fCurrentThread(NULL)
+	fCurrentThread(NULL),
+	fCurrentStackTrace(NULL),
+	fCurrentStackFrameIndex(-1)
 {
 	sCurrentContext = this;
 }
@@ -110,6 +115,10 @@ CliContext::Init(Team* team, UserInterfaceListener* listener)
 	el_set(fEditLine, EL_EDITOR, "emacs");
 	el_set(fEditLine, EL_PROMPT, &_GetPrompt);
 
+	fNodeManager = new(std::nothrow) ValueNodeManager();
+	if (fNodeManager == NULL)
+		return B_NO_MEMORY;
+
 	return B_OK;
 }
 
@@ -136,6 +145,11 @@ CliContext::Cleanup()
 		fTeam->RemoveListener(this);
 		fTeam = NULL;
 	}
+
+	if (fNodeManager != NULL) {
+		fNodeManager->ReleaseReference();
+		fNodeManager = NULL;
+	}
 }
 
 
@@ -168,8 +182,25 @@ CliContext::SetCurrentThread(Thread* thread)
 
 	fCurrentThread = thread;
 
-	if (fCurrentThread != NULL)
+	if (fCurrentStackTrace != NULL) {
+		fCurrentStackTrace->ReleaseReference();
+		fCurrentStackTrace = NULL;
+		fCurrentStackFrameIndex = -1;
+		fNodeManager->SetStackFrame(NULL, NULL);
+	}
+
+	if (fCurrentThread != NULL) {
 		fCurrentThread->AcquireReference();
+		StackTrace* stackTrace = fCurrentThread->GetStackTrace();
+		// if the thread's stack trace has already been loaded,
+		// set it, otherwise we'll set it when we process the thread's
+		// stack trace changed event.
+		if (stackTrace != NULL) {
+			fCurrentStackTrace = stackTrace;
+			fCurrentStackTrace->AcquireReference();
+			SetCurrentStackFrameIndex(0);
+		}
+	}
 }
 
 
@@ -186,6 +217,24 @@ CliContext::PrintCurrentThread()
 }
 
 
+void
+CliContext::SetCurrentStackFrameIndex(int32 index)
+{
+	AutoLocker<BLocker> locker(fLock);
+
+	if (fCurrentStackTrace == NULL)
+		return;
+	else if (index < 0 || index >= fCurrentStackTrace->CountFrames())
+		return;
+
+	fCurrentStackFrameIndex = index;
+
+	StackFrame* frame = fCurrentStackTrace->FrameAt(index);
+	if (frame != NULL)
+		fNodeManager->SetStackFrame(fCurrentThread, frame);
+}
+
+
 const char*
 CliContext::PromptUser(const char* prompt)
 {
@@ -253,7 +302,7 @@ CliContext::WaitForThreadOrUser()
 
 		if (stoppedThread != NULL) {
 			if (fCurrentThread == NULL)
-				fCurrentThread = stoppedThread;
+				SetCurrentThread(stoppedThread);
 
 			_SignalInputLoop(EVENT_THREAD_STOPPED);
 		}
@@ -300,6 +349,13 @@ CliContext::ProcessPendingEvents()
 				printf("[thread stopped: %" B_PRId32 " \"%s\"]\n",
 					thread->ID(), thread->Name());
 				break;
+			case EVENT_THREAD_STACK_TRACE_CHANGED:
+				if (thread == fCurrentThread) {
+					fCurrentStackTrace = thread->GetStackTrace();
+					fCurrentStackTrace->AcquireReference();
+					SetCurrentStackFrameIndex(0);
+				}
+				break;
 		}
 	}
 }
@@ -335,6 +391,19 @@ CliContext::ThreadStateChanged(const Team::ThreadEvent& threadEvent)
 }
 
 
+void
+CliContext::ThreadStackTraceChanged(const Team::ThreadEvent& threadEvent)
+{
+	if (threadEvent.GetThread()->State() != THREAD_STATE_STOPPED)
+		return;
+
+	_QueueEvent(
+		new(std::nothrow) Event(EVENT_THREAD_STACK_TRACE_CHANGED,
+			threadEvent.GetThread()));
+	_SignalInputLoop(EVENT_THREAD_STACK_TRACE_CHANGED);
+}
+
+
 void
 CliContext::_QueueEvent(Event* event)
 {

src/apps/debugger/user_interface/cli/CliContext.h

@@ -15,18 +15,22 @@
 #include "Team.h"
 
 
+class StackFrame;
+class StackTrace;
 class Team;
 class UserInterfaceListener;
+class ValueNodeManager;
 
 
 class CliContext : private Team::Listener {
 public:
 			enum {
-				EVENT_QUIT					= 0x01,
-				EVENT_USER_INTERRUPT		= 0x02,
-				EVENT_THREAD_ADDED			= 0x04,
-				EVENT_THREAD_REMOVED		= 0x08,
-				EVENT_THREAD_STOPPED		= 0x10,
+				EVENT_QUIT							= 0x01,
+				EVENT_USER_INTERRUPT				= 0x02,
+				EVENT_THREAD_ADDED					= 0x04,
+				EVENT_THREAD_REMOVED				= 0x08,
+				EVENT_THREAD_STOPPED				= 0x10,
+				EVENT_THREAD_STACK_TRACE_CHANGED	= 0x20
 			};
 
 public:
@@ -46,12 +50,20 @@ class CliContext : private Team::Listener {
 			Team*				GetTeam() const	{ return fTeam; }
 			UserInterfaceListener* GetUserInterfaceListener() const
 									{ return fListener; }
+			ValueNodeManager*	GetValueNodeManager() const
+									{ return fNodeManager; }
+			StackTrace*			GetStackTrace() const
+									{ return fCurrentStackTrace; }
 
 			Thread*				CurrentThread() const { return fCurrentThread; }
 			thread_id			CurrentThreadID() const;
 			void				SetCurrentThread(Thread* thread);
 			void				PrintCurrentThread();
 
+			int32				CurrentStackFrameIndex() const
+									{ return fCurrentStackFrameIndex; }
+			void				SetCurrentStackFrameIndex(int32 index);
+
 			const char*			PromptUser(const char* prompt);
 			void				AddLineToInputHistory(const char* line);
 
@@ -72,6 +84,8 @@ class CliContext : private Team::Listener {
 
 	virtual	void				ThreadStateChanged(
 									const Team::ThreadEvent& event);
+	virtual	void				ThreadStackTraceChanged(
+									const Team::ThreadEvent& event);
 
 private:
 			void				_QueueEvent(Event* event);
@@ -86,6 +100,7 @@ class CliContext : private Team::Listener {
 			BLocker				fLock;
 			Team*				fTeam;
 			UserInterfaceListener* fListener;
+			ValueNodeManager*	fNodeManager;
 			EditLine*			fEditLine;
 			History*			fHistory;
 			const char*			fPrompt;
@@ -96,6 +111,8 @@ class CliContext : private Team::Listener {
 	volatile bool				fTerminating;
 
 			Thread*				fCurrentThread;
+			StackTrace*			fCurrentStackTrace;
+			int32				fCurrentStackFrameIndex;
 
 			EventList			fPendingEvents;
 };