[runtime] Create a version of our runtime that can be used with Nativ…

…eAOT.

This contributes towards xamarin#17339.

Make.config

@@ -651,6 +651,7 @@ ALL_DOTNET_PLATFORMS=iOS macOS tvOS MacCatalyst
 DOTNET_PLATFORMS=
 ifdef INCLUDE_IOS
 DOTNET_PLATFORMS+=iOS
+DOTNET_NATIVEAOT_PLATFORMS+=iOS
 
 # 32-bit architectures
 ifdef IOS_SUPPORTS_32BIT_ARCHITECTURES

mk/rules.mk

@@ -297,6 +297,8 @@ $(eval $(call NativeCompilationTemplate,-dotnet,-O2 -DDOTNET))
 $(eval $(call NativeCompilationTemplate,-dotnet-debug,-DDEBUG -DDOTNET))
 $(eval $(call NativeCompilationTemplate,-dotnet-coreclr,-O2 -DCORECLR_RUNTIME -DDOTNET))
 $(eval $(call NativeCompilationTemplate,-dotnet-coreclr-debug,-DDEBUG -DCORECLR_RUNTIME -DDOTNET))
+$(eval $(call NativeCompilationTemplate,-dotnet-nativeaot,-O2 -DCORECLR_RUNTIME -DDOTNET -DNATIVEAOT))
+$(eval $(call NativeCompilationTemplate,-dotnet-nativeaot-debug,-DDEBUG -DCORECLR_RUNTIME -DDOTNET -DNATIVEAOT))
 
 .libs/iphoneos .libs/iphonesimulator .libs/watchos .libs/watchsimulator .libs/tvos .libs/tvsimulator .libs/maccatalyst .libs/mac:
 	$(Q) mkdir -p $@

runtime/Makefile

@@ -22,7 +22,7 @@ SHIPPED_HEADERS +=         \
 	xamarin/monovm-bridge.h \
 	xamarin/coreclr-bridge.h \
 
-SHARED_SOURCES += mono-runtime.m bindings.m bindings-generated.m shared.m runtime.m trampolines.m trampolines-invoke.m xamarin-support.m nsstring-localization.m trampolines-varargs.m monovm-bridge.m coreclr-bridge.m
+SHARED_SOURCES += mono-runtime.m bindings.m bindings-generated.m shared.m runtime.m trampolines.m trampolines-invoke.m xamarin-support.m nsstring-localization.m trampolines-varargs.m monovm-bridge.m coreclr-bridge.m nativeaot-bridge.m
 SHARED_I386_SOURCES += trampolines-i386.m trampolines-i386-asm.s trampolines-i386-objc_msgSend.s trampolines-i386-objc_msgSendSuper.s trampolines-i386-objc_msgSend_stret.s trampolines-i386-objc_msgSendSuper_stret.s
 SHARED_X86_64_SOURCES += trampolines-x86_64.m trampolines-x86_64-asm.s trampolines-x86_64-objc_msgSend.s trampolines-x86_64-objc_msgSendSuper.s trampolines-x86_64-objc_msgSend_stret.s trampolines-x86_64-objc_msgSendSuper_stret.s
 SHARED_ARM64_SOURCES += trampolines-arm64.m trampolines-arm64-asm.s trampolines-arm64-objc_msgSend.s trampolines-arm64-objc_msgSendSuper.s
@@ -454,6 +454,11 @@ MAC_LIBS =                   \
 #    This is used when using the CoreCLR runtime instead of Mono.
 #    CORECLR_RUNTIME is defined for these versions of libxamarin.
 #
+# libxamarin-nativeaot.a:
+#    This is used when using NativeAOT.
+#    CORECLR_RUNTIME is defined for these versions of libxamarin (because the nativeaot bridge shares *a lot* of code with the coreclr bridge)
+#    NATIVEAOT is defined for these versions of libxamarin
+#
 
 ifdef INCLUDE_XAMARIN_LEGACY
 all-local:: $(TARGETS)
@@ -614,6 +619,17 @@ endef
 
 $(foreach platform,$(DOTNET_CORECLR_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(eval $(call DotNetCoreClrLibTemplate,$(platform),$(rid)))))
 
+define DotNetNativeAotLibTemplate
+DOTNET_TARGETS += \
+	$(DOTNET_DESTDIR)/Microsoft.$(1).Runtime.$(2)/runtimes/$(2)/native/libxamarin-dotnet-nativeaot.a \
+	$(DOTNET_DESTDIR)/Microsoft.$(1).Runtime.$(2)/runtimes/$(2)/native/libxamarin-dotnet-nativeaot-debug.a \
+	$(DOTNET_DESTDIR)/Microsoft.$(1).Runtime.$(2)/runtimes/$(2)/native/libxamarin-dotnet-nativeaot.dylib \
+	$(DOTNET_DESTDIR)/Microsoft.$(1).Runtime.$(2)/runtimes/$(2)/native/libxamarin-dotnet-nativeaot-debug.dylib \
+
+endef
+
+$(foreach platform,$(DOTNET_NATIVEAOT_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(eval $(call DotNetNativeAotLibTemplate,$(platform),$(rid)))))
+
 # a few lookup tables, because the data we have is not always in the format we need it
 DOTNET_iphonesimulator_DYLIB_FLAGS=-lmonosgen-2.0 -licudata -licui18n -licuuc -framework UIKit
 DOTNET_iphoneos_DYLIB_FLAGS=-lmonosgen-2.0 -licudata -licui18n -licuuc -framework UIKit
@@ -704,6 +720,8 @@ $(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIM
 $(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(foreach arch,$(DOTNET_$(rid)_ARCHITECTURES),$(eval $(call DotNetLibXamarinTemplate,$(DOTNET_$(rid)_SDK_PLATFORM),$(rid),$(arch),_DEBUG,-dotnet-debug,,.mono)))))
 $(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(foreach arch,$(DOTNET_$(rid)_ARCHITECTURES),$(eval $(call DotNetLibXamarinTemplate,$(DOTNET_$(rid)_SDK_PLATFORM),$(rid),$(arch),_CORECLR,-dotnet-coreclr,_CORECLR)))))
 $(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(foreach arch,$(DOTNET_$(rid)_ARCHITECTURES),$(eval $(call DotNetLibXamarinTemplate,$(DOTNET_$(rid)_SDK_PLATFORM),$(rid),$(arch),_CORECLR_DEBUG,-dotnet-coreclr-debug,_CORECLR)))))
+$(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(foreach arch,$(DOTNET_$(rid)_ARCHITECTURES),$(eval $(call DotNetLibXamarinTemplate,$(DOTNET_$(rid)_SDK_PLATFORM),$(rid),$(arch),_NATIVEAOT,-dotnet-nativeaot,_NATIVEAOT,.mono)))))
+$(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(foreach arch,$(DOTNET_$(rid)_ARCHITECTURES),$(eval $(call DotNetLibXamarinTemplate,$(DOTNET_$(rid)_SDK_PLATFORM),$(rid),$(arch),_NATIVEAOT_DEBUG,-dotnet-nativeaot-debug,_NATIVEAOT,.mono)))))
 
 #
 # DotNetLibExtensionTemplate builds lib[tv]extension.a
@@ -731,6 +749,7 @@ endef
 
 $(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(foreach arch,$(DOTNET_$(rid)_ARCHITECTURES),$(eval $(call DotNetLibExtensionTemplate,$(DOTNET_$(rid)_SDK_PLATFORM),$(rid),$(arch),,-dotnet,,)))))
 $(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(foreach arch,$(DOTNET_$(rid)_ARCHITECTURES),$(eval $(call DotNetLibExtensionTemplate,$(DOTNET_$(rid)_SDK_PLATFORM),$(rid),$(arch),_CORECLR,-dotnet-coreclr,_CORECLR)))))
+$(foreach platform,$(DOTNET_PLATFORMS),$(foreach rid,$(DOTNET_$(platform)_RUNTIME_IDENTIFIERS),$(foreach arch,$(DOTNET_$(rid)_ARCHITECTURES),$(eval $(call DotNetLibExtensionTemplate,$(DOTNET_$(rid)_SDK_PLATFORM),$(rid),$(arch),_NATOVEAOT,-dotnet-nativeaot,_NATOVEAOT)))))
 
 dotnet: $(DOTNET_TARGETS)
 

runtime/coreclr-bridge.m

@@ -11,6 +11,7 @@
 #include <sys/stat.h>
 #include <inttypes.h>
 #include <pthread.h>
+#include <sys/mman.h>
 
 #include "product.h"
 #include "runtime-internal.h"
@@ -537,18 +538,20 @@
 	xamarin_assertion_message ("%s threw an exception: %p = %s", method, gchandle, [xamarin_print_all_exceptions (gchandle) UTF8String]);
 }
 
-typedef void (*xamarin_runtime_initialize_decl)(struct InitializationOptions* options);
+#if !defined (NATIVEAOT)
+typedef void (*xamarin_runtime_initialize_decl)(struct InitializationOptions* options, GCHandle* exception_gchandle);
 void
 xamarin_bridge_call_runtime_initialize (struct InitializationOptions* options, GCHandle* exception_gchandle)
 {
 	void *del = NULL;
-	int rv = coreclr_create_delegate (coreclr_handle, coreclr_domainId, PRODUCT ", Version=0.0.0.0", "ObjCRuntime.Runtime", "Initialize", &del);
+	int rv = coreclr_create_delegate (coreclr_handle, coreclr_domainId, PRODUCT ", Version=0.0.0.0", "ObjCRuntime.Runtime", "SafeInitialize", &del);
 	if (rv != 0)
 		xamarin_assertion_message ("xamarin_bridge_call_runtime_initialize: failed to create delegate: %i\n", rv);
 
 	xamarin_runtime_initialize_decl runtime_initialize = (xamarin_runtime_initialize_decl) del;
-	runtime_initialize (options);
+	runtime_initialize (options, exception_gchandle);
 }
+#endif // !defined (NATIVEAOT)
 
 void
 xamarin_bridge_register_product_assembly (GCHandle* exception_gchandle)

runtime/nativeaot-bridge.m

@@ -0,0 +1,35 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+*  Authors: Rolf Bjarne Kvinge
+*
+*  Copyright (C) 2023 Microsoft Corp.
+*
+*/
+
+#if defined (NATIVEAOT)
+
+#include <sys/stat.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <sys/mman.h>
+#include <dlfcn.h>
+
+#include "product.h"
+#include "runtime-internal.h"
+#include "slinked-list.h"
+#include "xamarin/xamarin.h"
+#include "xamarin/coreclr-bridge.h"
+
+typedef void (*xamarin_runtime_initialize_decl)(struct InitializationOptions* options, GCHandle* exception_gchandle);
+void
+xamarin_bridge_call_runtime_initialize (struct InitializationOptions* options, GCHandle* exception_gchandle)
+{
+	void *del = dlsym (RTLD_DEFAULT, "xamarin_objcruntime_runtime_nativeaotinitialize");
+	if (del == NULL)
+		xamarin_assertion_message ("xamarin_bridge_call_runtime_initialize: failed to load xamarin_objcruntime_runtime_nativeaotinitialize: %s\n", dlerror ());
+
+	xamarin_runtime_initialize_decl runtime_initialize = (xamarin_runtime_initialize_decl) del;
+	runtime_initialize (options, exception_gchandle);
+}
+
+#endif // NATIVEAOT

runtime/runtime.m

@@ -1304,12 +1304,14 @@ -(void) xamarinSetFlags: (enum XamarinGCHandleFlags) flags;
 #endif
 
 #if defined (CORECLR_RUNTIME)
+#if !defined(__arm__) // the dynamic trampolines haven't been implemented in 32-bit ARM assembly.
 	options.xamarin_objc_msgsend = (void *) xamarin_dyn_objc_msgSend;
 	options.xamarin_objc_msgsend_super = (void *) xamarin_dyn_objc_msgSendSuper;
 #if !defined(__aarch64__)
 	options.xamarin_objc_msgsend_stret = (void *) xamarin_dyn_objc_msgSend_stret;
 	options.xamarin_objc_msgsend_super_stret = (void *) xamarin_dyn_objc_msgSendSuper_stret;
 #endif // !defined(__aarch64__)
+#endif // !defined(__arm__)
 	options.unhandled_exception_handler = (void *) &xamarin_coreclr_unhandled_exception_handler;
 	options.reference_tracking_begin_end_callback = (void *) &xamarin_coreclr_reference_tracking_begin_end_callback;
 	options.reference_tracking_is_referenced_callback = (void *) &xamarin_coreclr_reference_tracking_is_referenced_callback;

src/ObjCRuntime/Runtime.cs

@@ -227,6 +227,20 @@ internal static bool Initialized {
 		static extern int _NSGetExecutablePath (byte[] buf, ref int bufsize);
 #endif
 
+#if NET
+		[Preserve] // called from native - nativeaot-bridge.m and coreclr-bridge.m.
+		[UnmanagedCallersOnly (EntryPoint = "xamarin_objcruntime_runtime_nativeaotinitialize")]
+		unsafe static void SafeInitialize (InitializationOptions* options, IntPtr* exception_gchandle)
+		{
+			*exception_gchandle = IntPtr.Zero;
+			try {
+				Initialize (options);
+			} catch (Exception e) {
+				*exception_gchandle = AllocGCHandle (e);
+			}
+		}
+#endif
+
 		[Preserve] // called from native - runtime.m.
 		[BindingImpl (BindingImplOptions.Optimizable)] // To inline the Runtime.DynamicRegistrationSupported code if possible.
 		unsafe static void Initialize (InitializationOptions* options)