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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2023. All Rights Reserved.
*
* 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.
*
* %CopyrightEnd%
*/
#ifndef __BEAM_JIT_TYPES_HPP__
#define __BEAM_JIT_TYPES_HPP__
/* Type-safe wrapper around the definitions in beam_types.h. We've redefined it
* as an `enum class` to force the usage of our helpers, which lets us check
* for common usage errors at compile time. */
enum class BeamTypeId : int {
None = BEAM_TYPE_NONE,
Atom = BEAM_TYPE_ATOM,
Bitstring = BEAM_TYPE_BITSTRING,
BsMatchState = BEAM_TYPE_BS_MATCHSTATE,
Cons = BEAM_TYPE_CONS,
Float = BEAM_TYPE_FLOAT,
Fun = BEAM_TYPE_FUN,
Integer = BEAM_TYPE_INTEGER,
Map = BEAM_TYPE_MAP,
Nil = BEAM_TYPE_NIL,
Pid = BEAM_TYPE_PID,
Port = BEAM_TYPE_PORT,
Reference = BEAM_TYPE_REFERENCE,
Tuple = BEAM_TYPE_TUPLE,
Any = BEAM_TYPE_ANY,
Identifier = Pid | Port | Reference,
List = Cons | Nil,
Number = Float | Integer,
/** @brief Types that can be boxed, including those that may also be
* immediates (e.g. pids, integers). */
MaybeBoxed = Bitstring | BsMatchState | Float | Fun | Integer | Map | Pid |
Port | Reference | Tuple,
/** @brief Types that can be immediates, including those that may also be
* boxed (e.g. pids, integers). */
MaybeImmediate = Atom | Integer | Nil | Pid | Port,
/** @brief Types that are _always_ boxed. */
AlwaysBoxed = MaybeBoxed & ~(Cons | MaybeImmediate),
/** @brief Types that are _always_ immediates. */
AlwaysImmediate = MaybeImmediate & ~(Cons | MaybeBoxed),
};
template<BeamTypeId... T>
struct BeamTypeIdUnion;
template<>
struct BeamTypeIdUnion<> {
static constexpr BeamTypeId value() {
return BeamTypeId::None;
}
};
template<BeamTypeId T, BeamTypeId... Rest>
struct BeamTypeIdUnion<T, Rest...> : BeamTypeIdUnion<Rest...> {
using integral = std::underlying_type_t<BeamTypeId>;
using super = BeamTypeIdUnion<Rest...>;
/* Overlapping type specifications are redundant at best and a subtle error
* at worst. We've had several bugs where `Integer | MaybeBoxed` was used
* instead of `Integer | AlwaysBoxed` or similar, and erroneously drew the
* conclusion that the value is always an integer when not boxed, when it
* could also be a pid or port. */
static constexpr bool no_overlap =
(static_cast<integral>(super::value()) &
static_cast<integral>(T)) == BEAM_TYPE_NONE;
static constexpr bool no_boxed_overlap =
no_overlap || (super::value() != BeamTypeId::MaybeBoxed &&
T != BeamTypeId::MaybeBoxed);
static constexpr bool no_immed_overlap =
no_overlap || (super::value() != BeamTypeId::MaybeImmediate &&
T != BeamTypeId::MaybeImmediate);
static_assert(no_boxed_overlap,
"types must not overlap, did you mean to use "
"BeamTypeId::AlwaysBoxed here?");
static_assert(no_immed_overlap,
"types must not overlap, did you mean to use "
"BeamTypeId::AlwaysImmediate here?");
static_assert(no_overlap || no_boxed_overlap || no_immed_overlap,
"types must not overlap");
static constexpr bool is_single_typed() {
constexpr auto V = static_cast<integral>(value());
return (static_cast<integral>(V) & (static_cast<integral>(V) - 1)) ==
BEAM_TYPE_NONE;
}
static constexpr BeamTypeId value() {
return static_cast<BeamTypeId>(static_cast<integral>(super::value()) |
static_cast<integral>(T));
}
};
struct BeamArgType : public BeamType {
BeamTypeId type() const {
return static_cast<BeamTypeId>(BeamType::type_union);
}
bool hasLowerBound() const {
return metadata_flags & BEAM_TYPE_HAS_LOWER_BOUND;
}
bool hasUpperBound() const {
return metadata_flags & BEAM_TYPE_HAS_UPPER_BOUND;
}
bool hasUnit() const {
return metadata_flags & BEAM_TYPE_HAS_UNIT;
}
auto max() const {
ASSERT(hasUpperBound());
return BeamType::max;
}
auto min() const {
ASSERT(hasLowerBound());
return BeamType::min;
}
auto unit() const {
ASSERT(hasUnit());
return BeamType::size_unit;
}
};
static_assert(std::is_standard_layout<BeamArgType>::value);
#endif
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