Add convenience helper `ArtMethod::NewObject()`.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: I4961d4f121f782d47490f7e5e718ee28b3b87efa

1 files changed, 76 insertions, 0 deletions

diff --git a/runtime/art_method-alloc-inl.h b/runtime/art_method-alloc-inl.h
new file mode 100644
index 0000000000..13051b156e
--- /dev/null
+++ b/runtime/art_method-alloc-inl.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#ifndef ART_RUNTIME_ART_METHOD_ALLOC_INL_H_
+#define ART_RUNTIME_ART_METHOD_ALLOC_INL_H_
+
+#include "art_method-inl.h"
+
+#include "handle.h"
+#include "handle_scope.h"
+#include "mirror/class-alloc-inl.h"
+
+namespace art {
+
+namespace detail {
+
+template <char Shorty>
+struct HandleShortyTraits {
+  using Type = typename ShortyTraits<Shorty>::Type;
+  static Type Extract(Type value) ALWAYS_INLINE { return value; }
+};
+
+template <> struct HandleShortyTraits<'L'> {
+  using Type = Handle<mirror::Object>;
+  static typename ShortyTraits<'L'>::Type Extract(Type value)
+      REQUIRES_SHARED(Locks::mutator_lock_) ALWAYS_INLINE {
+    return value.Get();
+  }
+};
+
+}  // namespace detail
+
+template <char... ArgType, typename HandleScopeType>
+inline Handle<mirror::Object> ArtMethod::NewObject(
+    HandleScopeType& hs,
+    Thread* self,
+    typename detail::HandleShortyTraits<ArgType>::Type... args) {
+  DCHECK(!GetDeclaringClass()->IsInterface());
+  DCHECK(GetDeclaringClass()->IsInitialized());
+  DCHECK(IsConstructor());
+  DCHECK(!IsStatic());
+  MutableHandle<mirror::Object> new_object = hs.NewHandle(GetDeclaringClass()->AllocObject(self));
+  DCHECK_EQ(new_object == nullptr, self->IsExceptionPending());
+  if (LIKELY(new_object != nullptr)) {
+    InvokeInstance<'V', ArgType...>(
+        self, new_object.Get(), detail::HandleShortyTraits<ArgType>::Extract(args)...);
+    if (UNLIKELY(self->IsExceptionPending())) {
+      new_object.Assign(nullptr);
+    }
+  }
+  return new_object;
+}
+
+template <char... ArgType>
+inline ObjPtr<mirror::Object> ArtMethod::NewObject(
+    Thread* self, typename detail::HandleShortyTraits<ArgType>::Type... args) {
+  StackHandleScope<1u> hs(self);
+  return NewObject<ArgType...>(hs, self, args...).Get();
+}
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_ART_METHOD_ALLOC_INL_H_