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Diffstat (limited to 'runtime/stack_indirect_reference_table.h')
-rw-r--r-- | runtime/stack_indirect_reference_table.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/runtime/stack_indirect_reference_table.h b/runtime/stack_indirect_reference_table.h new file mode 100644 index 0000000..dd10634 --- /dev/null +++ b/runtime/stack_indirect_reference_table.h @@ -0,0 +1,99 @@ +/* + * 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_ |