Load the native call wrapper via Thread.

runtime/vm/stub_code_arm64.cc

 // Copyright (c) 2014, 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.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 196 matching lines @@
   __ StoreToOffset(R3, SP, retval_offset);
   __ mov(R0, SP);  // Pass the pointer to the NativeArguments.
 
   // We are entering runtime code, so the C stack pointer must be restored from
   // the stack limit to the top of the stack. We cache the stack limit address
   // in the Dart SP register, which is callee-saved in the C ABI.
   __ mov(R26, CSP);
   __ mov(CSP, SP);
 
   __ mov(R1, R5);  // Pass the function entrypoint to call.
+
   // Call native function invocation wrapper or redirection via simulator.
-#if defined(USING_SIMULATOR)
-  uword entry = reinterpret_cast<uword>(NativeEntry::NativeCallWrapper);
-  entry = Simulator::RedirectExternalReference(
-      entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments);
-  __ LoadImmediate(R2, entry);
-  __ blr(R2);
-#else
-  __ BranchLink(&NativeEntry::NativeCallWrapperLabel());
-#endif
+  __ ldr(LR, Address(THR, Thread::native_call_wrapper_entry_point_offset()));
+  __ blr(LR);
 
   // Restore SP and CSP.
   __ mov(SP, CSP);
   __ mov(CSP, R26);
 
   // Mark that the isolate is executing Dart code.
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, R28, Isolate::vm_tag_offset());
 
   // Reset exit frame information in Isolate structure.
@@ skipping 1928 matching lines @@
 // Result:
 //  R1: entry point.
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler, R0, R1, R1);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64