Fix more co19 crashes. Introduce GET_NATIVE_ARGUMENT that throws an illegal argument exception if...

runtime/vm/native_entry.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_NATIVE_ENTRY_H_
 #define VM_NATIVE_ENTRY_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/native_arguments.h"
@@ skipping 34 matching lines @@
       DN_Helper##name(arguments);                                              \
     }                                                                          \
     VERIFY_ON_TRANSITION;                                                      \
   }                                                                            \
   static void DN_Helper##name(NativeArguments* arguments)
 
 
 #define DECLARE_NATIVE_ENTRY(name, argument_count)                             \
   extern void NATIVE_ENTRY_FUNCTION(name)(Dart_NativeArguments arguments);
 
+// Natives should throw an exception if an illegal argument is passed.
+// type name = value.
+#define GET_NATIVE_ARGUMENT(type, name, value)                                 \
+  type& name = type::Handle();                                                 \
+  {                                                                            \
+    const Instance& __instance__ = Instance::CheckedHandle(value);             \
+    if (!__instance__.Is##type()) {                                            \
+      GrowableArray<const Object*> __args__;                                   \
+      __args__.Add(&__instance__);                                             \
+      Exceptions::ThrowByType(Exceptions::kIllegalArgument, __args__);         \
+    }                                                                          \
+    name ^= __instance__.raw();                                                \
+  }
+
+
 
 // Helper class for resolving and handling native functions.
 class NativeEntry : public AllStatic {
  public:
   // Resolve specified dart native function to the actual native entrypoint.
   static NativeFunction ResolveNative(const Class& cls,
                                       const String& function_name,
                                       int number_of_arguments);
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ENTRY_H_