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Diffstat (limited to 'runtime/arch/code_offset.h')
-rw-r--r-- | runtime/arch/code_offset.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/runtime/arch/code_offset.h b/runtime/arch/code_offset.h new file mode 100644 index 0000000000..ab04b1eaa7 --- /dev/null +++ b/runtime/arch/code_offset.h @@ -0,0 +1,92 @@ +/* + * Copyright (C) 2017 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_ARCH_CODE_OFFSET_H_ +#define ART_RUNTIME_ARCH_CODE_OFFSET_H_ + +#include <iosfwd> + +#include "base/bit_utils.h" +#include "base/logging.h" +#include "instruction_set.h" + +namespace art { + +// CodeOffset is a holder for compressed code offsets. Since some architectures have alignment +// requirements it is possible to compress code offsets to reduce stack map sizes. +class CodeOffset { + public: + ALWAYS_INLINE static CodeOffset FromOffset(uint32_t offset, InstructionSet isa = kRuntimeISA) { + return CodeOffset(offset / GetInstructionSetInstructionAlignment(isa)); + } + + ALWAYS_INLINE static CodeOffset FromCompressedOffset(uint32_t offset) { + return CodeOffset(offset); + } + + ALWAYS_INLINE uint32_t Uint32Value(InstructionSet isa = kRuntimeISA) const { + uint32_t decoded = value_ * GetInstructionSetInstructionAlignment(isa); + DCHECK_GE(decoded, value_) << "Integer overflow"; + return decoded; + } + + // Return compressed internal value. + ALWAYS_INLINE uint32_t CompressedValue() const { + return value_; + } + + ALWAYS_INLINE CodeOffset() = default; + ALWAYS_INLINE CodeOffset(const CodeOffset&) = default; + ALWAYS_INLINE CodeOffset& operator=(const CodeOffset&) = default; + ALWAYS_INLINE CodeOffset& operator=(CodeOffset&&) = default; + + private: + ALWAYS_INLINE explicit CodeOffset(uint32_t value) : value_(value) {} + + uint32_t value_ = 0u; +}; + +inline bool operator==(const CodeOffset& a, const CodeOffset& b) { + return a.CompressedValue() == b.CompressedValue(); +} + +inline bool operator!=(const CodeOffset& a, const CodeOffset& b) { + return !(a == b); +} + +inline bool operator<(const CodeOffset& a, const CodeOffset& b) { + return a.CompressedValue() < b.CompressedValue(); +} + +inline bool operator<=(const CodeOffset& a, const CodeOffset& b) { + return a.CompressedValue() <= b.CompressedValue(); +} + +inline bool operator>(const CodeOffset& a, const CodeOffset& b) { + return a.CompressedValue() > b.CompressedValue(); +} + +inline bool operator>=(const CodeOffset& a, const CodeOffset& b) { + return a.CompressedValue() >= b.CompressedValue(); +} + +inline std::ostream& operator<<(std::ostream& os, const CodeOffset& offset) { + return os << offset.Uint32Value(); +} + +} // namespace art + +#endif // ART_RUNTIME_ARCH_CODE_OFFSET_H_ |