1 files changed, 98 insertions, 0 deletions
diff --git a/runtime/var_handles.cc b/runtime/var_handles.cc
new file mode 100644
index 0000000000..f08742fcd7
--- /dev/null
+++ b/runtime/var_handles.cc
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2018 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 "var_handles.h"
+
+#include "common_throws.h"
+#include "dex/dex_instruction.h"
+#include "handle.h"
+#include "method_handles-inl.h"
+#include "mirror/method_type.h"
+#include "mirror/var_handle.h"
+
+namespace art {
+
+namespace {
+
+bool VarHandleInvokeAccessorWithConversions(Thread* self,
+                                            ShadowFrame& shadow_frame,
+                                            Handle<mirror::VarHandle> var_handle,
+                                            Handle<mirror::MethodType> callsite_type,
+                                            const mirror::VarHandle::AccessMode access_mode,
+                                            const InstructionOperands* const operands,
+                                            JValue* result)
+    REQUIRES_SHARED(Locks::mutator_lock_) {
+  StackHandleScope<1> hs(self);
+  Handle<mirror::MethodType> accessor_type(hs.NewHandle(
+      var_handle->GetMethodTypeForAccessMode(self, access_mode)));
+  const size_t num_vregs = accessor_type->NumberOfVRegs();
+  const int num_params = accessor_type->GetPTypes()->GetLength();
+  ShadowFrameAllocaUniquePtr accessor_frame =
+      CREATE_SHADOW_FRAME(num_vregs, nullptr, shadow_frame.GetMethod(), shadow_frame.GetDexPC());
+  ShadowFrameGetter getter(shadow_frame, operands);
+  static const uint32_t kFirstDestinationReg = 0;
+  ShadowFrameSetter setter(accessor_frame.get(), kFirstDestinationReg);
+  if (!PerformConversions(self, callsite_type, accessor_type, &getter, &setter, num_params)) {
+    return false;
+  }
+  RangeInstructionOperands accessor_operands(kFirstDestinationReg,
+                                             kFirstDestinationReg + num_vregs);
+  if (!var_handle->Access(access_mode, accessor_frame.get(), &accessor_operands, result)) {
+    return false;
+  }
+  return ConvertReturnValue(callsite_type, accessor_type, result);
+}
+
+}  // namespace
+
+bool VarHandleInvokeAccessor(Thread* self,
+                             ShadowFrame& shadow_frame,
+                             Handle<mirror::VarHandle> var_handle,
+                             Handle<mirror::MethodType> callsite_type,
+                             const mirror::VarHandle::AccessMode access_mode,
+                             const InstructionOperands* const operands,
+                             JValue* result) {
+  if (var_handle.IsNull()) {
+    ThrowNullPointerExceptionFromDexPC();
+    return false;
+  }
+
+  if (!var_handle->IsAccessModeSupported(access_mode)) {
+    ThrowUnsupportedOperationException();
+    return false;
+  }
+
+  mirror::VarHandle::MatchKind match_kind =
+      var_handle->GetMethodTypeMatchForAccessMode(access_mode, callsite_type.Get());
+  if (LIKELY(match_kind == mirror::VarHandle::MatchKind::kExact)) {
+    return var_handle->Access(access_mode, &shadow_frame, operands, result);
+  } else if (match_kind == mirror::VarHandle::MatchKind::kWithConversions) {
+    return VarHandleInvokeAccessorWithConversions(self,
+                                                  shadow_frame,
+                                                  var_handle,
+                                                  callsite_type,
+                                                  access_mode,
+                                                  operands,
+                                                  result);
+  } else {
+    DCHECK_EQ(match_kind, mirror::VarHandle::MatchKind::kNone);
+    ThrowWrongMethodTypeException(var_handle->PrettyDescriptorForAccessMode(access_mode),
+                                  callsite_type->PrettyDescriptor());
+    return false;
+  }
+}
+
+}  // namespace art