92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_ARCH_CODE_OFFSET_H_
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#define ART_RUNTIME_ARCH_CODE_OFFSET_H_
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#include <iosfwd>
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#include "base/bit_utils.h"
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#include "base/logging.h"
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#include "instruction_set.h"
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namespace art {
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// CodeOffset is a holder for compressed code offsets. Since some architectures have alignment
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// requirements it is possible to compress code offsets to reduce stack map sizes.
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class CodeOffset {
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public:
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ALWAYS_INLINE static CodeOffset FromOffset(uint32_t offset, InstructionSet isa = kRuntimeISA) {
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return CodeOffset(offset / GetInstructionSetInstructionAlignment(isa));
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}
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ALWAYS_INLINE static CodeOffset FromCompressedOffset(uint32_t offset) {
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return CodeOffset(offset);
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}
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ALWAYS_INLINE uint32_t Uint32Value(InstructionSet isa = kRuntimeISA) const {
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uint32_t decoded = value_ * GetInstructionSetInstructionAlignment(isa);
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DCHECK_GE(decoded, value_) << "Integer overflow";
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return decoded;
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}
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// Return compressed internal value.
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ALWAYS_INLINE uint32_t CompressedValue() const {
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return value_;
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}
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ALWAYS_INLINE CodeOffset() = default;
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ALWAYS_INLINE CodeOffset(const CodeOffset&) = default;
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ALWAYS_INLINE CodeOffset& operator=(const CodeOffset&) = default;
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ALWAYS_INLINE CodeOffset& operator=(CodeOffset&&) = default;
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private:
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ALWAYS_INLINE explicit CodeOffset(uint32_t value) : value_(value) {}
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uint32_t value_ = 0u;
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};
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inline bool operator==(const CodeOffset& a, const CodeOffset& b) {
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return a.CompressedValue() == b.CompressedValue();
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}
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inline bool operator!=(const CodeOffset& a, const CodeOffset& b) {
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return !(a == b);
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}
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inline bool operator<(const CodeOffset& a, const CodeOffset& b) {
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return a.CompressedValue() < b.CompressedValue();
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}
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inline bool operator<=(const CodeOffset& a, const CodeOffset& b) {
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return a.CompressedValue() <= b.CompressedValue();
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}
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inline bool operator>(const CodeOffset& a, const CodeOffset& b) {
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return a.CompressedValue() > b.CompressedValue();
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}
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inline bool operator>=(const CodeOffset& a, const CodeOffset& b) {
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return a.CompressedValue() >= b.CompressedValue();
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}
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inline std::ostream& operator<<(std::ostream& os, const CodeOffset& offset) {
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return os << offset.Uint32Value();
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}
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} // namespace art
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#endif // ART_RUNTIME_ARCH_CODE_OFFSET_H_
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