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using System;
using Math = System.Math;
using System.Text;
using System.Collections;
using System.Runtime.InteropServices;
using Mono.Debugger.Backend;
namespace Mono.Debugger
{
public class Backtrace : DebuggerMarshalByRefObject
{
public enum Mode {
Default,
Native,
Managed
}
StackFrame last_frame;
ArrayList frames;
int current_frame_idx;
public Backtrace (StackFrame first_frame)
{
this.last_frame = first_frame;
frames = new ArrayList ();
frames.Add (first_frame);
}
public int Count {
get { return frames.Count; }
}
public StackFrame[] Frames {
get {
StackFrame[] retval = new StackFrame [frames.Count];
frames.CopyTo (retval, 0);
return retval;
}
}
public StackFrame this [int number] {
get { return (StackFrame) frames [number]; }
}
public StackFrame CurrentFrame {
get { return this [current_frame_idx]; }
}
public int CurrentFrameIndex {
get { return current_frame_idx; }
set {
if ((value < 0) || (value >= frames.Count))
throw new ArgumentException ();
current_frame_idx = value;
}
}
internal void GetBacktrace (ThreadServant thread, TargetMemoryAccess memory,
Mode mode, TargetAddress until, int max_frames)
{
while (TryUnwind (thread, memory, mode, until)) {
if ((max_frames != -1) && (frames.Count > max_frames))
break;
}
// Ugly hack: in Mode == Mode.Default, we accept wrappers but not as the
// last frame.
if ((mode == Mode.Default) && (frames.Count > 1)) {
StackFrame last = this [frames.Count - 1];
if (!IsFrameOkForMode (last, Mode.Managed))
frames.Remove (last);
}
}
private StackFrame TryLMF (ThreadServant thread, TargetMemoryAccess memory)
{
try {
if (thread.LMFAddress.IsNull)
return null;
StackFrame new_frame = thread.Architecture.GetLMF (thread, memory);
if (new_frame == null)
return null;
// Sanity check; don't loop.
if (new_frame.StackPointer <= last_frame.StackPointer)
return null;
return new_frame;
} catch (TargetException) {
return null;
}
}
private bool TryCallback (ThreadServant thread, TargetMemoryAccess memory,
StackFrame last_frame, bool exact_match)
{
StackFrame new_frame = null;
try {
Registers callback = thread.GetCallbackFrame (
last_frame.StackPointer, exact_match);
if (callback == null)
return false;
new_frame = thread.Architecture.CreateFrame (
thread.Client, memory, callback, false);
} catch (TargetException) {
return false;
}
if (new_frame == null)
return false;
AddFrame (new StackFrame (
thread.Client, new_frame.TargetAddress, new_frame.StackPointer,
new_frame.FrameAddress, new_frame.Registers, thread.NativeLanguage,
new Symbol ("<method called from mdb>", new_frame.TargetAddress, 0)));
AddFrame (new_frame);
return true;
}
private bool IsFrameOkForMode (StackFrame frame, Mode mode)
{
if (mode == Mode.Native)
return true;
if ((frame.Language == null) || !frame.Language.IsManaged)
return false;
if (mode == Mode.Default)
return true;
if ((frame.SourceAddress == null) || (frame.Method == null))
return false;
return frame.Method.WrapperType == WrapperType.None;
}
internal bool TryUnwind (ThreadServant thread, TargetMemoryAccess memory,
Mode mode, TargetAddress until)
{
StackFrame new_frame = null;
try {
new_frame = last_frame.UnwindStack (memory);
} catch (TargetException) {
}
if ((new_frame == null) || !IsFrameOkForMode (new_frame, mode)) {
if (TryCallback (thread, memory, last_frame, false))
return true;
new_frame = TryLMF (thread, memory);
if (new_frame == null)
return false;
} else if (TryCallback (thread, memory, new_frame, true))
return true;
if (new_frame == null)
return false;
// Sanity check; don't loop.
if (new_frame.StackPointer <= last_frame.StackPointer)
return false;
if (!until.IsNull && (new_frame.StackPointer >= until))
return false;
AddFrame (new_frame);
return true;
}
public string Print ()
{
StringBuilder sb = new StringBuilder ();
foreach (StackFrame frame in frames)
sb.Append (String.Format ("{0}\n", frame));
return sb.ToString ();
}
internal void AddFrame (StackFrame new_frame)
{
new_frame.SetLevel (frames.Count);
frames.Add (new_frame);
last_frame = new_frame;
}
}
}
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