Load the native call wrapper via Thread.

runtime/vm/stub_code_arm.cc

 // Copyright (c) 2013, 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_ARM)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/cpu.h"
@@ skipping 174 matching lines @@
   // Set retval in NativeArgs.
   __ add(R3, FP, Operand(kCallerSpSlotFromFp * kWordSize));
 
   // Passing the structure by value as in runtime calls would require changing
   // Dart API for native functions.
   // For now, space is reserved on the stack and we pass a pointer to it.
   __ stm(IA, SP,  (1 << R0) | (1 << R1) | (1 << R2) | (1 << R3));
   __ mov(R0, Operand(SP));  // Pass the pointer to the NativeArguments.
 
   __ mov(R1, Operand(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);
-  const ExternalLabel label(Simulator::RedirectExternalReference(
-      entry, Simulator::kNativeCall, NativeEntry::kNumCallWrapperArguments));
-  __ LoadExternalLabel(R2, &label, kNotPatchable);
-  __ blx(R2);
-#else
-  __ LoadExternalLabel(
-      LR, &NativeEntry::NativeCallWrapperLabel(), kNotPatchable);
+  __ ldr(LR, Address(THR, Thread::native_call_wrapper_entry_point_offset()));
   __ blx(LR);
-#endif
 
   // Mark that the isolate is executing Dart code.
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(kWord, R2, R7, Isolate::vm_tag_offset());
 
   // Reset exit frame information in Isolate structure.
   __ LoadImmediate(R2, 0);
   __ StoreToOffset(kWord, R2, THR, Thread::top_exit_frame_info_offset());
 
   __ LeaveStubFrame();
@@ skipping 1891 matching lines @@
 // Result:
 //  R1: entry point.
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler, R0, R1, R1);
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM