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/*
* Copyright (C) 2018 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_DEX_REGISTER_LOCATION_H_
#define ART_RUNTIME_DEX_REGISTER_LOCATION_H_
#include <array>
#include <cstdint>
#include "base/dchecked_vector.h"
#include "base/memory_region.h"
namespace art {
// Dex register location container used by DexRegisterMap and StackMapStream.
class DexRegisterLocation {
public:
enum class Kind : int32_t {
kInvalid = -2, // only used internally during register map decoding.
kNone = -1, // vreg has not been set.
kInStack, // vreg is on the stack, value holds the stack offset.
kConstant, // vreg is a constant value.
kInRegister, // vreg is in low 32 bits of a core physical register.
kInRegisterHigh, // vreg is in high 32 bits of a core physical register.
kInFpuRegister, // vreg is in low 32 bits of an FPU register.
kInFpuRegisterHigh, // vreg is in high 32 bits of an FPU register.
};
DexRegisterLocation(Kind kind, int32_t value) : kind_(kind), value_(value) {}
static DexRegisterLocation None() { return DexRegisterLocation(Kind::kNone, 0); }
static DexRegisterLocation Invalid() { return DexRegisterLocation(Kind::kInvalid, 0); }
bool IsLive() const { return kind_ != Kind::kNone; }
Kind GetKind() const { return kind_; }
int32_t GetValue() const { return value_; }
bool operator==(DexRegisterLocation other) const {
return kind_ == other.kind_ && value_ == other.value_;
}
bool operator!=(DexRegisterLocation other) const {
return !(*this == other);
}
int32_t GetStackOffsetInBytes() const {
DCHECK(kind_ == Kind::kInStack);
return value_;
}
int32_t GetConstant() const {
DCHECK(kind_ == Kind::kConstant);
return value_;
}
int32_t GetMachineRegister() const {
DCHECK(kind_ == Kind::kInRegister ||
kind_ == Kind::kInRegisterHigh ||
kind_ == Kind::kInFpuRegister ||
kind_ == Kind::kInFpuRegisterHigh);
return value_;
}
private:
DexRegisterLocation() {}
Kind kind_;
int32_t value_;
friend class DexRegisterMap; // Allow creation of uninitialized array of locations.
};
std::ostream& operator<<(std::ostream& stream, DexRegisterLocation::Kind kind);
std::ostream& operator<<(std::ostream& stream, const DexRegisterLocation& reg);
} // namespace art
#endif // ART_RUNTIME_DEX_REGISTER_LOCATION_H_
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