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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_CODEGEN_TNODE_H_
#define V8_CODEGEN_TNODE_H_
#include "src/codegen/machine-type.h"
namespace v8 {
namespace internal {
class HeapNumber;
class BigInt;
class Object;
class Smi;
class TaggedIndex;
namespace compiler {
class Node;
}
struct UntaggedT {};
struct IntegralT : UntaggedT {};
struct WordT : IntegralT {
static const MachineRepresentation kMachineRepresentation =
MachineType::PointerRepresentation();
};
struct RawPtrT : WordT {
static constexpr MachineType kMachineType = MachineType::Pointer();
};
template <class To>
struct RawPtr : RawPtrT {};
struct Word32T : IntegralT {
static const MachineRepresentation kMachineRepresentation =
MachineRepresentation::kWord32;
};
struct Int32T : Word32T {
static constexpr MachineType kMachineType = MachineType::Int32();
};
struct Uint32T : Word32T {
static constexpr MachineType kMachineType = MachineType::Uint32();
};
struct Int16T : Int32T {
static constexpr MachineType kMachineType = MachineType::Int16();
};
struct Uint16T : Uint32T, Int32T {
static constexpr MachineType kMachineType = MachineType::Uint16();
};
struct Int8T : Int16T {
static constexpr MachineType kMachineType = MachineType::Int8();
};
struct Uint8T : Uint16T, Int16T {
static constexpr MachineType kMachineType = MachineType::Uint8();
};
struct Word64T : IntegralT {
static const MachineRepresentation kMachineRepresentation =
MachineRepresentation::kWord64;
};
struct Int64T : Word64T {
static constexpr MachineType kMachineType = MachineType::Int64();
};
struct Uint64T : Word64T {
static constexpr MachineType kMachineType = MachineType::Uint64();
};
struct IntPtrT : WordT {
static constexpr MachineType kMachineType = MachineType::IntPtr();
};
struct UintPtrT : WordT {
static constexpr MachineType kMachineType = MachineType::UintPtr();
};
struct Float32T : UntaggedT {
static const MachineRepresentation kMachineRepresentation =
MachineRepresentation::kFloat32;
static constexpr MachineType kMachineType = MachineType::Float32();
};
struct Float64T : UntaggedT {
static const MachineRepresentation kMachineRepresentation =
MachineRepresentation::kFloat64;
static constexpr MachineType kMachineType = MachineType::Float64();
};
#ifdef V8_COMPRESS_POINTERS
using TaggedT = Int32T;
#else
using TaggedT = IntPtrT;
#endif
// Result of a comparison operation.
struct BoolT : Word32T {};
// Value type of a Turbofan node with two results.
template <class T1, class T2>
struct PairT {};
inline constexpr MachineType CommonMachineType(MachineType type1,
MachineType type2) {
return (type1 == type2) ? type1
: ((type1.IsTagged() && type2.IsTagged())
? MachineType::AnyTagged()
: MachineType::None());
}
template <class Type, class Enable = void>
struct MachineTypeOf {
static constexpr MachineType value = Type::kMachineType;
};
template <class Type, class Enable>
constexpr MachineType MachineTypeOf<Type, Enable>::value;
template <>
struct MachineTypeOf<Object> {
static constexpr MachineType value = MachineType::AnyTagged();
};
template <>
struct MachineTypeOf<MaybeObject> {
static constexpr MachineType value = MachineType::AnyTagged();
};
template <>
struct MachineTypeOf<Smi> {
static constexpr MachineType value = MachineType::TaggedSigned();
};
template <>
struct MachineTypeOf<TaggedIndex> {
static constexpr MachineType value = MachineType::Pointer();
};
template <class HeapObjectSubtype>
struct MachineTypeOf<HeapObjectSubtype,
typename std::enable_if<std::is_base_of<
HeapObject, HeapObjectSubtype>::value>::type> {
static constexpr MachineType value = MachineType::TaggedPointer();
};
template <>
struct MachineTypeOf<ExternalReference> {
static constexpr MachineType value = MachineType::Pointer();
};
template <class HeapObjectSubtype>
constexpr MachineType MachineTypeOf<
HeapObjectSubtype, typename std::enable_if<std::is_base_of<
HeapObject, HeapObjectSubtype>::value>::type>::value;
template <class Type, class Enable = void>
struct MachineRepresentationOf {
static const MachineRepresentation value = Type::kMachineRepresentation;
};
// If T defines kMachineType, then we take the machine representation from
// there.
template <class T>
struct MachineRepresentationOf<T, base::void_t<decltype(T::kMachineType)>> {
static const MachineRepresentation value = T::kMachineType.representation();
};
template <class T>
struct MachineRepresentationOf<
T, typename std::enable_if<std::is_base_of<Object, T>::value>::type> {
static const MachineRepresentation value =
MachineTypeOf<T>::value.representation();
};
template <class T>
struct MachineRepresentationOf<
T, typename std::enable_if<std::is_base_of<MaybeObject, T>::value>::type> {
static const MachineRepresentation value =
MachineTypeOf<T>::value.representation();
};
template <>
struct MachineRepresentationOf<ExternalReference> {
static const MachineRepresentation value = RawPtrT::kMachineRepresentation;
};
template <typename T>
constexpr bool IsMachineRepresentationOf(MachineRepresentation r) {
return MachineRepresentationOf<T>::value == r;
}
template <class T>
struct is_valid_type_tag {
static const bool value = std::is_base_of<Object, T>::value ||
std::is_base_of<UntaggedT, T>::value ||
std::is_base_of<MaybeObject, T>::value ||
std::is_same<ExternalReference, T>::value;
static const bool is_tagged = std::is_base_of<Object, T>::value ||
std::is_base_of<MaybeObject, T>::value;
};
template <class T1, class T2>
struct is_valid_type_tag<PairT<T1, T2>> {
static const bool value =
is_valid_type_tag<T1>::value && is_valid_type_tag<T2>::value;
static const bool is_tagged = false;
};
template <class T1, class T2>
struct UnionT;
template <class T1, class T2>
struct is_valid_type_tag<UnionT<T1, T2>> {
static const bool is_tagged =
is_valid_type_tag<T1>::is_tagged && is_valid_type_tag<T2>::is_tagged;
static const bool value = is_tagged;
};
template <class T1, class T2>
struct UnionT {
static constexpr MachineType kMachineType =
CommonMachineType(MachineTypeOf<T1>::value, MachineTypeOf<T2>::value);
static const MachineRepresentation kMachineRepresentation =
kMachineType.representation();
static_assert(kMachineRepresentation != MachineRepresentation::kNone,
"no common representation");
static_assert(is_valid_type_tag<T1>::is_tagged &&
is_valid_type_tag<T2>::is_tagged,
"union types are only possible for tagged values");
};
using AnyTaggedT = UnionT<Object, MaybeObject>;
using Number = UnionT<Smi, HeapNumber>;
using Numeric = UnionT<Number, BigInt>;
// A pointer to a builtin function, used by Torque's function pointers.
using BuiltinPtr = Smi;
class int31_t {
public:
int31_t() : value_(0) {}
int31_t(int value) : value_(value) { // NOLINT(runtime/explicit)
DCHECK_EQ((value & 0x80000000) != 0, (value & 0x40000000) != 0);
}
int31_t& operator=(int value) {
DCHECK_EQ((value & 0x80000000) != 0, (value & 0x40000000) != 0);
value_ = value;
return *this;
}
int32_t value() const { return value_; }
operator int32_t() const { return value_; }
private:
int32_t value_;
};
template <class T, class U>
struct is_subtype {
static const bool value =
std::is_base_of<U, T>::value || (std::is_same<U, MaybeObject>::value &&
std::is_convertible<T, Object>::value);
};
template <class T1, class T2, class U>
struct is_subtype<UnionT<T1, T2>, U> {
static const bool value =
is_subtype<T1, U>::value && is_subtype<T2, U>::value;
};
template <class T, class U1, class U2>
struct is_subtype<T, UnionT<U1, U2>> {
static const bool value =
is_subtype<T, U1>::value || is_subtype<T, U2>::value;
};
template <class T1, class T2, class U1, class U2>
struct is_subtype<UnionT<T1, T2>, UnionT<U1, U2>> {
static const bool value =
(is_subtype<T1, U1>::value || is_subtype<T1, U2>::value) &&
(is_subtype<T2, U1>::value || is_subtype<T2, U2>::value);
};
template <class T, class U>
struct types_have_common_values {
static const bool value = is_subtype<T, U>::value || is_subtype<U, T>::value;
};
template <class U>
struct types_have_common_values<BoolT, U> {
static const bool value = types_have_common_values<Word32T, U>::value;
};
template <class U>
struct types_have_common_values<Uint32T, U> {
static const bool value = types_have_common_values<Word32T, U>::value;
};
template <class U>
struct types_have_common_values<Int32T, U> {
static const bool value = types_have_common_values<Word32T, U>::value;
};
template <class U>
struct types_have_common_values<Uint64T, U> {
static const bool value = types_have_common_values<Word64T, U>::value;
};
template <class U>
struct types_have_common_values<Int64T, U> {
static const bool value = types_have_common_values<Word64T, U>::value;
};
template <class U>
struct types_have_common_values<IntPtrT, U> {
static const bool value = types_have_common_values<WordT, U>::value;
};
template <class U>
struct types_have_common_values<UintPtrT, U> {
static const bool value = types_have_common_values<WordT, U>::value;
};
template <class T1, class T2, class U>
struct types_have_common_values<UnionT<T1, T2>, U> {
static const bool value = types_have_common_values<T1, U>::value ||
types_have_common_values<T2, U>::value;
};
template <class T, class U1, class U2>
struct types_have_common_values<T, UnionT<U1, U2>> {
static const bool value = types_have_common_values<T, U1>::value ||
types_have_common_values<T, U2>::value;
};
template <class T1, class T2, class U1, class U2>
struct types_have_common_values<UnionT<T1, T2>, UnionT<U1, U2>> {
static const bool value = types_have_common_values<T1, U1>::value ||
types_have_common_values<T1, U2>::value ||
types_have_common_values<T2, U1>::value ||
types_have_common_values<T2, U2>::value;
};
// TNode<T> is an SSA value with the static type tag T, which is one of the
// following:
// - MaybeObject represents the type of all tagged values, including weak
// pointers.
// - a subclass of internal::Object represents a non-weak tagged type.
// - a subclass of internal::UntaggedT represents an untagged type
// - ExternalReference
// - PairT<T1, T2> for an operation returning two values, with types T1
// and T2
// - UnionT<T1, T2> represents either a value of type T1 or of type T2.
template <class T>
class TNode {
public:
template <class U,
typename std::enable_if<is_subtype<U, T>::value, int>::type = 0>
TNode(const TNode<U>& other) : node_(other) {
LazyTemplateChecks();
}
TNode() : TNode(nullptr) {}
TNode operator=(TNode other) {
DCHECK_NOT_NULL(other.node_);
node_ = other.node_;
return *this;
}
bool is_null() { return node_ == nullptr; }
operator compiler::Node*() const { return node_; }
static TNode UncheckedCast(compiler::Node* node) { return TNode(node); }
protected:
explicit TNode(compiler::Node* node) : node_(node) { LazyTemplateChecks(); }
private:
// These checks shouldn't be checked before TNode is actually used.
void LazyTemplateChecks() {
static_assert(is_valid_type_tag<T>::value, "invalid type tag");
}
compiler::Node* node_;
};
// SloppyTNode<T> is a variant of TNode<T> and allows implicit casts from
// Node*. It is intended for function arguments as long as some call sites
// still use untyped Node* arguments.
// TODO(tebbi): Delete this class once transition is finished.
template <class T>
class SloppyTNode : public TNode<T> {
public:
SloppyTNode(compiler::Node* node) // NOLINT(runtime/explicit)
: TNode<T>(node) {}
template <class U, typename std::enable_if<is_subtype<U, T>::value,
int>::type = 0>
SloppyTNode(const TNode<U>& other) // NOLINT(runtime/explicit)
: TNode<T>(other) {}
};
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_TNODE_H_
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