From 21d4e4acab784be677204ab402a3ceda5781a719 Mon Sep 17 00:00:00 2001
From: Tanner Gooding <tagoo@outlook.com>
Date: Wed, 24 Feb 2021 10:05:10 -0800
Subject: [PATCH 1/3] Preserve the System.RuntimeType constructor in mono
 ILLink

---
 .../System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml b/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
index ce6945b1108eee..be15292c9a64eb 100644
--- a/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
+++ b/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
@@ -309,7 +309,9 @@
 
 		<!-- domain.c: mono_defaults.runtimetype_class -->
 		<!-- under mono, this has no runtime visible fields -->
-		<type fullname="System.RuntimeType" preserve="nothing" />
+		<type fullname="System.RuntimeType">
+			<method signature="System.Void .ctor()" />
+		</type>
 
 		<!-- domain.c: mono_defaults.typehandle_class -->
 		<type fullname="System.RuntimeTypeHandle" preserve="fields" />

From bf1246f3a86a12d2a75ab2f028d4d204ffbc6e6b Mon Sep 17 00:00:00 2001
From: Tanner Gooding <tagoo@outlook.com>
Date: Wed, 24 Feb 2021 11:42:54 -0800
Subject: [PATCH 2/3] Update
 src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml

---
 .../System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml     | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml b/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
index be15292c9a64eb..3a2922c015fba6 100644
--- a/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
+++ b/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
@@ -309,6 +309,7 @@
 
 		<!-- domain.c: mono_defaults.runtimetype_class -->
 		<!-- under mono, this has no runtime visible fields -->
+		<!-- RuntimeType is a fundamental type and the constructor is called by the runtime to implement reflection primitives like Object.GetType() and typeof(C) -->
 		<type fullname="System.RuntimeType">
 			<method signature="System.Void .ctor()" />
 		</type>

From 47d72551c3533e76a079d2a5040cbb0565923968 Mon Sep 17 00:00:00 2001
From: Tanner Gooding <tagoo@outlook.com>
Date: Wed, 24 Feb 2021 12:14:28 -0800
Subject: [PATCH 3/3] Update
 src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml

Co-authored-by: Larry Ewing <lewing@microsoft.com>
---
 .../System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml b/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
index 3a2922c015fba6..a327adba23fc35 100644
--- a/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
+++ b/src/mono/System.Private.CoreLib/src/ILLink/ILLink.Descriptors.xml
@@ -308,7 +308,7 @@
 		<type fullname="System.RuntimeMethodHandle" preserve="fields" />
 
 		<!-- domain.c: mono_defaults.runtimetype_class -->
-		<!-- under mono, this has no runtime visible fields -->
+		<!-- under mono, this has no runtime visible fields but the constructor can be called from unmanaged code in mono_type_get_object_checked -->
 		<!-- RuntimeType is a fundamental type and the constructor is called by the runtime to implement reflection primitives like Object.GetType() and typeof(C) -->
 		<type fullname="System.RuntimeType">
 			<method signature="System.Void .ctor()" />