99 lines
2.7 KiB
C++
99 lines
2.7 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#pragma once
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#include "common/assert.h"
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#include "common/bit_util.h"
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#include "common/common_types.h"
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namespace Dynarmic {
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namespace A64 {
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/**
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* Imm represents an immediate value in an AArch64 instruction.
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* Imm is used during translation as a typesafe way of passing around immediates of fixed sizes.
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*/
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template <size_t bit_size_>
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class Imm {
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public:
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static constexpr size_t bit_size = bit_size_;
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explicit Imm(u32 value) : value(value) {
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ASSERT_MSG((Common::Bits<0, bit_size-1>(value) == value), "More bits in value than expected");
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}
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template <typename T = u32>
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T ZeroExtend() const {
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static_assert(Common::BitSize<T>() <= bit_size);
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return value;
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}
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template <typename T = s32>
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T SignExtend() const {
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static_assert(Common::BitSize<T>() <= bit_size);
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return static_cast<T>(Common::SignExtend<bit_size>(value));
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}
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template <size_t bit>
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bool Bit() const {
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static_assert(bit < bit_size);
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return Common::Bit<bit>(value);
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}
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bool operator==(const Imm<bit_size>& other) const {
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return value == other.value;
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}
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bool operator!=(const Imm<bit_size>& other) const {
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return value != other.value;
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}
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private:
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static_assert(bit_size != 0, "Cannot have a zero-sized immediate");
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static_assert(bit_size <= 32, "Cannot have an immediate larger than the instruction size");
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u32 value;
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};
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template <size_t bit_size>
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bool operator==(u32 a, const Imm<bit_size>& b) {
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return Imm<bit_size>{a} == b;
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}
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template <size_t bit_size>
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bool operator==(const Imm<bit_size>& a, u32 b) {
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return Imm<bit_size>{b} == a;
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}
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template <size_t bit_size>
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bool operator!=(u32 a, const Imm<bit_size>& b) {
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return Imm<bit_size>{a} != b;
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}
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template <size_t bit_size>
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bool operator!=(const Imm<bit_size>& a, u32 b) {
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return Imm<bit_size>{b} != a;
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}
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/**
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* Concatentate immediates together.
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* Left to right correpeonds to most significant imm to least significant imm.
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* This is equivalent to a:b:...:z in ASL.
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*/
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template <size_t first_bit_size, size_t ...rest_bit_sizes>
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auto concatenate(Imm<first_bit_size> first, Imm<rest_bit_sizes> ...rest) -> Imm<(first_bit_size + ... + rest_bit_sizes)> {
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if constexpr (sizeof...(rest) == 0) {
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return first;
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} else {
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const auto concat_rest = concatenate(rest...);
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const u32 value = (first.ZeroExtend() << concat_rest.bit_size) | concat_rest.ZeroExtend();
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return Imm<(first_bit_size + ... + rest_bit_sizes)>{value};
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}
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}
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} // namespace A64
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} // namespace Dynarmic
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