Add comments on debug stuff & fix warnings

src/ARMeilleure/Instructions/NativeInterface.cs

@@ -176,7 +176,8 @@ namespace ARMeilleure.Instructions
             Statistics.PauseTimer();
 
             ExecutionContext context = GetContext();
-
+            
+            // If debugging, we'll handle interrupts outside
             if (Optimizations.EnableDebugging && context.Interrupted)
             {
                 return false;

src/ARMeilleure/State/ExecutionContext.cs

@@ -102,10 +102,8 @@ namespace ARMeilleure.State
         private readonly ExceptionCallback _undefinedCallback;
 
         internal int ShouldStep;
-        internal int DebugStopped;
+        public ulong DebugPc { get; set; }
-        
+        public Barrier StepBarrier { get; }
-        public ulong DebugPc; // This is only valid while debugging is enabled.
-        public Barrier StepBarrier = new Barrier(2);
 
         public ExecutionContext(
             IJitMemoryAllocator allocator,
@@ -123,6 +121,7 @@ namespace ARMeilleure.State
             _undefinedCallback = undefinedCallback;
 
             Running = true;
+            StepBarrier = new Barrier(2);
 
             _nativeContext.SetCounter(MinCountForCheck);
         }

src/Ryujinx.Cpu/IExecutionContext.cs

@@ -115,10 +115,31 @@ namespace Ryujinx.Cpu
         /// </remarks>
         void StopRunning();
 
-        // TODO: comments
+        /// <summary>
+        /// Requests the thread to stop running temporarily and call <see cref="ExceptionCallbacks.InterruptCallback"/>.
+        /// </summary>
+        /// <remarks>
+        /// The thread might not pause immediately.
+        /// One must not assume that guest code is no longer being executed by the thread after calling this function.
+        /// After single stepping, the thread should signal and wait on <see cref="StepBarrier"/> twice to allow
+        /// changing the thread state after stepping.
+        /// </remarks>
         void RequestDebugStep();
 
-        ulong DebugPc { get; set; }
+        /// <summary>
+        /// Step barrier
+        /// </summary>
+        /// <remarks>
+        /// Should be signaled and waited on twice after single-stepping.
+        /// </remarks>
         Barrier StepBarrier { get; }
+
+        /// <summary>
+        /// Current Program Counter (for debugging).
+        /// </summary>
+        /// <remarks>
+        /// PC register for the debugger. Must not be accessed while the thread isn't stopped for debugging.
+        /// </remarks>
+        ulong DebugPc { get; set; }
     }
 }