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/*
* 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 <android-base/logging.h>
#include "base/bit_utils.h"
#include "base/macros.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_