Implement speculative translation on the CPU (#515)

* Implement speculative translation on the cpu, and change the way how branches to unknown or untranslated addresses works

* Port t0opt changes and other cleanups

* Change namespace from translation related classes to ChocolArm64.Translation, other minor tweaks

* Fix typo

* Translate higher quality code for indirect jumps aswell, and on some cases that were missed when lower quality (tier 0) code was available

* Remove debug print

* Remove direct argument passing optimization, and enable tail calls for BR instructions

* Call delegates directly with Callvirt rather than calling Execute, do not emit calls for tier 0 code

* Remove unused property

* Rename argument on ArmSubroutine delegate

1 files changed, 65 insertions, 0 deletions

diff --git a/ChocolArm64/Translation/TranslatedSub.cs b/ChocolArm64/Translation/TranslatedSub.cs
new file mode 100644
index 00000000..65d70351
--- /dev/null
+++ b/ChocolArm64/Translation/TranslatedSub.cs
@@ -0,0 +1,65 @@
+using ChocolArm64.Memory;
+using ChocolArm64.State;
+using System;
+using System.Reflection;
+using System.Reflection.Emit;
+
+namespace ChocolArm64.Translation
+{
+    delegate long ArmSubroutine(CpuThreadState state, MemoryManager memory);
+
+    class TranslatedSub
+    {
+        public ArmSubroutine Delegate { get; private set; }
+
+        public static int StateArgIdx  { get; private set; }
+        public static int MemoryArgIdx { get; private set; }
+
+        public static Type[] FixedArgTypes { get; private set; }
+
+        public DynamicMethod Method { get; private set; }
+
+        public TranslationTier Tier { get; private set; }
+
+        public TranslatedSub(DynamicMethod method, TranslationTier tier)
+        {
+            Method = method ?? throw new ArgumentNullException(nameof(method));;
+            Tier   = tier;
+        }
+
+        static TranslatedSub()
+        {
+            MethodInfo mthdInfo = typeof(ArmSubroutine).GetMethod("Invoke");
+
+            ParameterInfo[] Params = mthdInfo.GetParameters();
+
+            FixedArgTypes = new Type[Params.Length];
+
+            for (int index = 0; index < Params.Length; index++)
+            {
+                Type argType = Params[index].ParameterType;
+
+                FixedArgTypes[index] = argType;
+
+                if (argType == typeof(CpuThreadState))
+                {
+                    StateArgIdx = index;
+                }
+                else if (argType == typeof(MemoryManager))
+                {
+                    MemoryArgIdx = index;
+                }
+            }
+        }
+
+        public void PrepareMethod()
+        {
+            Delegate = (ArmSubroutine)Method.CreateDelegate(typeof(ArmSubroutine));
+        }
+
+        public long Execute(CpuThreadState threadState, MemoryManager memory)
+        {
+            return Delegate(threadState, memory);
+        }
+    }
+}
\ No newline at end of file