Introduce support for hardware simulators, starting with ARM64

Simulator support for ARM64 is implemented with VIXL.
Now codegen_test will also run on all supported hardware simulators.

Change-Id: Idc740f566175d1a23c373ea9292b8fc5ba526d00
diff --git a/runtime/simulator/code_simulator.cc b/runtime/simulator/code_simulator.cc
new file mode 100644
index 0000000..5023e48
--- /dev/null
+++ b/runtime/simulator/code_simulator.cc
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "simulator/code_simulator.h"
+#include "simulator/code_simulator_arm64.h"
+
+namespace art {
+
+CodeSimulator* CodeSimulator::CreateCodeSimulator(InstructionSet target_isa) {
+  DCHECK(CanSimulate(target_isa));
+  switch (target_isa) {
+    case kArm64:
+      return new arm64::CodeSimulatorArm64();
+    default:
+      UNREACHABLE();
+  }
+}
+
+bool CodeSimulator::CanSimulate(InstructionSet target_isa) {
+  switch (target_isa) {
+    case kArm64:
+      return arm64::CodeSimulatorArm64::CanSimulateArm64();
+    default:
+      // No simulator support for target.
+      return false;
+  }
+}
+
+}  // namespace art