From bb3ae37d71a0993a09abc59a0d8255c074dc885b Mon Sep 17 00:00:00 2001
From: monojenkins <jo.shields+jenkins@xamarin.com>
Date: Fri, 16 Nov 2018 15:15:35 -0500
Subject: [interp] attempt to intrinsify again after a method is resolved
 regarding generics (#11715)

[2018-06] [interp] attempt to intrinsify again after a method is resolved regarding generics

discovered when running https://github.com/Clancey/gMusic



Backport of #11712.

/cc @luhenry @lewurm
---
 mono/mini/builtin-types.cs   | 32 ++++++++++++++++++++++++++++++++
 mono/mini/interp/transform.c |  7 +++++++
 2 files changed, 39 insertions(+)

diff --git a/mono/mini/builtin-types.cs b/mono/mini/builtin-types.cs
index 42131a766a8..a07f477a431 100644
--- a/mono/mini/builtin-types.cs
+++ b/mono/mini/builtin-types.cs
@@ -12,6 +12,7 @@ using System.Diagnostics;
 using System.Globalization;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using System.Collections.Generic;
 
 
 public class BuiltinTests {
@@ -290,6 +291,37 @@ public class BuiltinTests {
 		return 0;
 	}
 
+	private sealed class MyGenericEqualityComparer<T> : EqualityComparer<T> where T : IEquatable<T>
+	{
+		public sealed override bool Equals(T x, T y) {
+			if (x != null) {
+				if (y != null)
+					return x.Equals (y);
+				return false;
+			}
+			if (y != null)
+				return false;
+			return true;
+		}
+
+		public sealed override int GetHashCode(T obj)
+		{
+			if (obj == null)
+				return 0;
+			return obj.GetHashCode ();
+		}
+	}
+
+	static int test_0_nint_genequals ()
+	{
+		MyGenericEqualityComparer<nint> cmp = new MyGenericEqualityComparer<nint> ();
+		if (cmp.Equals ((nint) 1, (nint) 2))
+			return 1;
+		if (!cmp.Equals ((nint) 4, (nint) 4))
+			return 2;
+		return 0;
+	}
+
 	static int test_0_nint_call_boxed_funs ()
 	{
 		object x = new nint (10);
diff --git a/mono/mini/interp/transform.c b/mono/mini/interp/transform.c
index 0a5e3910b71..cc87a40890c 100644
--- a/mono/mini/interp/transform.c
+++ b/mono/mini/interp/transform.c
@@ -1076,6 +1076,9 @@ interp_handle_intrinsics (TransformData *td, MonoMethod *target_method, MonoMeth
 		} else if (!strcmp ("ToString", tm)) {
 			/* white list */
 			return FALSE;
+		} else if (!strcmp ("GetHashCode", tm)) {
+			/* white list */
+			return FALSE;
 		} else if (!strcmp ("IsNaN", tm) || !strcmp ("IsInfinity", tm) || !strcmp ("IsNegativeInfinity", tm) || !strcmp ("IsPositiveInfinity", tm)) {
 			g_assert (type_index == 2); // nfloat only
 			/* white list */
@@ -1286,6 +1289,10 @@ interp_transform_call (TransformData *td, MonoMethod *method, MonoMethod *target
 #if DEBUG_INTERP
 		g_print ("                    : %s::%s.  %s (%p)\n", target_method->klass->name, target_method->name, mono_signature_full_name (target_method->signature), target_method);
 #endif
+		/* Intrinsics: Try again, it could be that `mono_get_method_constrained_with_method` resolves to a method that we can substitute */
+		if (target_method && interp_handle_intrinsics (td, target_method, csignature, readonly, &op))
+			return;
+
 		return_if_nok (error);
 		mono_class_setup_vtable (target_method->klass);
 
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