Debugger - fix how IMemoryCallbackSystem is used, breakpoint control no longer permanently disabled even when it is implemented in a core

BizHawk.Client.EmuHawk/tools/Debugger/GenericDebugger.IToolForm.cs

@@ -15,8 +15,8 @@ namespace BizHawk.Client.EmuHawk
 		private IDisassemblable Disassembler { get; set; }
 		[OptionalService]
 		private IMemoryDomains MemoryDomainSource { get; set; }
-		[OptionalService]
-		private IMemoryCallbackSystem MCS { get; set; }
+
+		private IMemoryCallbackSystem MemoryCallbacks { get { return Debuggable.MemoryCallbacks; } }
 
 		private MemoryDomainList MemoryDomains { get { return MemoryDomainSource.MemoryDomains; } }
 
@@ -28,6 +28,27 @@ namespace BizHawk.Client.EmuHawk
 
 		#region Implementation checking
 
+		private bool CanUseMemoryCallbacks
+		{
+			get
+			{
+				if (Debuggable != null)
+				{
+					try
+					{
+						var result = Debuggable.MemoryCallbacks.HasReads;
+						return true;
+					}
+					catch (NotImplementedException)
+					{
+						return false;
+					}
+				}
+
+				return false;
+			}
+		}
+
 		private bool CanDisassemble
 		{
 			get

BizHawk.Client.EmuHawk/tools/Debugger/GenericDebugger.cs

@@ -91,11 +91,18 @@ namespace BizHawk.Client.EmuHawk
 			RegisterPanel.ParentDebugger = this;
 			RegisterPanel.GenerateUI();
 
-			BreakPointControl1.Core = Debuggable;
-			BreakPointControl1.MCS = MCS;
-			BreakPointControl1.ParentDebugger = this;
-			BreakPointControl1.MemoryDomains = MemoryDomains;
-			BreakPointControl1.GenerateUI();
+			if (CanUseMemoryCallbacks)
+			{
+				BreakPointControl1.Core = Debuggable;
+				BreakPointControl1.MCS = MemoryCallbacks;
+				BreakPointControl1.ParentDebugger = this;
+				BreakPointControl1.MemoryDomains = MemoryDomains;
+				BreakPointControl1.GenerateUI();
+			}
+			else
+			{
+				DisableBreakpointBox();
+			}
 
 			StepIntoMenuItem.Enabled = StepIntoBtn.Enabled = CanStepInto;
 			StepOutMenuItem.Enabled = StepOutBtn.Enabled = CanStepOut;