* Made TraceEntryIterator available in the kernel.

* Fixed TraceEntryIterator::Current(): If fEntry was NULL, it would
  return 0x4.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26955 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/tracing.h

@@ -63,6 +63,7 @@ class TraceOutput {
 		bigtime_t	fLastEntryTime;
 };
 
+
 class TraceEntry {
 	public:
 		TraceEntry();
@@ -89,6 +90,7 @@ class TraceEntry {
 		}
 };
 
+
 class AbstractTraceEntry : public TraceEntry {
 	public:
 		AbstractTraceEntry();
@@ -108,6 +110,7 @@ class AbstractTraceEntry : public TraceEntry {
 		bigtime_t	fTime;
 };
 
+
 class LazyTraceOutput : public TraceOutput {
 public:
 	LazyTraceOutput(char* buffer, size_t bufferSize, uint32 flags)
@@ -126,6 +129,7 @@ public:
 	}
 };
 
+
 class TraceFilter {
 public:
 	virtual ~TraceFilter();
@@ -145,11 +149,52 @@ public:
 	};
 };
 
+
 class WrapperTraceFilter : public TraceFilter {
 public:
 	virtual void Init(TraceFilter* filter, int direction, bool continued) = 0;
 };
 
+
+class TraceEntryIterator {
+public:
+	TraceEntryIterator()
+		:
+ 		fEntry(NULL),
+		fIndex(0)
+	{
+	}
+
+	void Reset()
+	{
+		fEntry = NULL;
+		fIndex = 0;
+	}
+
+	int32 Index() const
+	{
+		return fIndex;
+	}
+
+	TraceEntry* Current() const
+	{
+		return fEntry != NULL ? TraceEntry::FromTraceEntry(fEntry) : NULL;
+	}
+
+	TraceEntry* Next();
+	TraceEntry* Previous();
+	TraceEntry* MoveTo(int32 index);
+
+private:
+	trace_entry* _NextNonBufferEntry(trace_entry* entry);
+	trace_entry* _PreviousNonBufferEntry(trace_entry* entry);
+
+private:
+	trace_entry*	fEntry;
+	int32			fIndex;
+};
+
+
 #endif	// __cplusplus
 
 #ifdef __cplusplus

src/system/kernel/debug/tracing.cpp

@@ -697,33 +697,9 @@ TraceFilterParser TraceFilterParser::sParser;
 #if ENABLE_TRACING
 
 
-class TraceEntryIterator {
-public:
-	TraceEntryIterator()
-		:
- 		fEntry(NULL),
-		fIndex(0)
-	{
-	}
-
-	void Reset()
-	{
-		fEntry = NULL;
-		fIndex = 0;
-	}
-
-	int32 Index() const
-	{
-		return fIndex;
-	}
-
-	TraceEntry* Current() const
-	{
-		return TraceEntry::FromTraceEntry(fEntry);
-	}
-
-	TraceEntry* Next()
-	{
+TraceEntry*
+TraceEntryIterator::Next()
+{
 	if (fIndex == 0) {
 		fEntry = _NextNonBufferEntry(sFirstEntry);
 		fIndex = 1;
@@ -733,10 +709,12 @@ public:
 	}
 
 	return Current();
-	}
+}
 
-	TraceEntry* Previous()
-	{
+
+TraceEntry*
+TraceEntryIterator::Previous()
+{
 	if (fIndex == (int32)sEntries + 1)
 		fEntry = sAfterLastEntry;
 
@@ -746,10 +724,12 @@ public:
 	}
 
 	return Current();
-	}
+}
 
-	TraceEntry* MoveTo(int32 index)
-	{
+
+TraceEntry*
+TraceEntryIterator::MoveTo(int32 index)
+{
 	if (index == fIndex)
 		return Current();
 
@@ -787,29 +767,27 @@ public:
 	}
 
 	return Current();
-	}
+}
 
-private:
-	trace_entry* _NextNonBufferEntry(trace_entry* entry)
-	{
+
+trace_entry*
+TraceEntryIterator::_NextNonBufferEntry(trace_entry* entry)
+{
 	while (entry != NULL && (entry->flags & BUFFER_ENTRY) != 0)
 		entry = next_entry(entry);
 
 	return entry;
-	}
+}
 
-	trace_entry* _PreviousNonBufferEntry(trace_entry* entry)
-	{
+
+trace_entry*
+TraceEntryIterator::_PreviousNonBufferEntry(trace_entry* entry)
+{
 	while (entry != NULL && (entry->flags & BUFFER_ENTRY) != 0)
 		entry = previous_entry(entry);
 
 	return entry;
-	}
-
-private:
-	trace_entry*	fEntry;
-	int32			fIndex;
-};
+}
 
 
 int