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+/*
+ * Copyright (C) 2011 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_SRC_STACK_INDIRECT_REFERENCE_TABLE_H_
+#define ART_SRC_STACK_INDIRECT_REFERENCE_TABLE_H_
+
+#include "base/logging.h"
+#include "base/macros.h"
+
+namespace art {
+namespace mirror {
+class Object;
+}
+class Thread;
+
+// Stack allocated indirect reference table. It can allocated within
+// the bridge frame between managed and native code backed by stack
+// storage or manually allocated by SirtRef to hold one reference.
+class StackIndirectReferenceTable {
+ public:
+ explicit StackIndirectReferenceTable(mirror::Object* object) :
+ number_of_references_(1), link_(NULL) {
+ references_[0] = object;
+ }
+
+ ~StackIndirectReferenceTable() {}
+
+ // Number of references contained within this SIRT
+ size_t NumberOfReferences() const {
+ return number_of_references_;
+ }
+
+ // Link to previous SIRT or NULL
+ StackIndirectReferenceTable* GetLink() const {
+ return link_;
+ }
+
+ void SetLink(StackIndirectReferenceTable* sirt) {
+ DCHECK_NE(this, sirt);
+ link_ = sirt;
+ }
+
+ mirror::Object* GetReference(size_t i) const {
+ DCHECK_LT(i, number_of_references_);
+ return references_[i];
+ }
+
+ void SetReference(size_t i, mirror::Object* object) {
+ DCHECK_LT(i, number_of_references_);
+ references_[i] = object;
+ }
+
+ bool Contains(mirror::Object** sirt_entry) const {
+ // A SIRT should always contain something. One created by the
+ // jni_compiler should have a jobject/jclass as a native method is
+ // passed in a this pointer or a class
+ DCHECK_GT(number_of_references_, 0U);
+ return ((&references_[0] <= sirt_entry)
+ && (sirt_entry <= (&references_[number_of_references_ - 1])));
+ }
+
+ // Offset of length within SIRT, used by generated code
+ static size_t NumberOfReferencesOffset() {
+ return OFFSETOF_MEMBER(StackIndirectReferenceTable, number_of_references_);
+ }
+
+ // Offset of link within SIRT, used by generated code
+ static size_t LinkOffset() {
+ return OFFSETOF_MEMBER(StackIndirectReferenceTable, link_);
+ }
+
+ private:
+ StackIndirectReferenceTable() {}
+
+ size_t number_of_references_;
+ StackIndirectReferenceTable* link_;
+
+ // number_of_references_ are available if this is allocated and filled in by jni_compiler.
+ mirror::Object* references_[1];
+
+ DISALLOW_COPY_AND_ASSIGN(StackIndirectReferenceTable);
+};
+
+} // namespace art
+
+#endif // ART_SRC_STACK_INDIRECT_REFERENCE_TABLE_H_