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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 <type_traits>
#include "include/v8config.h"
#include "src/codegen/machine-type.h"
#include "src/objects/tagged.h"
namespace v8 {
namespace internal {
class HeapNumber;
class BigInt;
namespace compiler {
class Node;
} // namespace compiler
struct UntaggedT {};
struct IntegralT : UntaggedT {};
struct WordT : IntegralT {
static const MachineRepresentation kMachineRepresentation =
MachineType::PointerRepresentation();
};
struct RawPtrT : WordT {
static constexpr MachineType kMachineType = MachineType::Pointer();
};
// A RawPtrT that is guaranteed to point into the sandbox.
struct SandboxedPtrT : WordT {
static constexpr MachineType kMachineType = MachineType::SandboxedPointer();
};
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 AdditiveSafeIntegerT : Word64T {
static constexpr MachineType kMachineType = MachineType::Int64();
};
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 ExternalPointerHandleT : Uint32T {
static constexpr MachineType kMachineType = MachineType::Uint32();
};
struct CppHeapPointerHandleT : Uint32T {
static constexpr MachineType kMachineType = MachineType::Uint32();
};
struct IndirectPointerHandleT : Uint32T {
static constexpr MachineType kMachineType = MachineType::Uint32();
};
struct JSDispatchHandleT : Uint32T {
static constexpr MachineType kMachineType = MachineType::Uint32();
};
#ifdef V8_ENABLE_SANDBOX
struct ExternalPointerT : Uint32T {
static constexpr MachineType kMachineType = MachineType::Uint32();
};
#else
struct ExternalPointerT : UntaggedT {
static constexpr MachineType kMachineType = MachineType::Pointer();
};
#endif
#ifdef V8_COMPRESS_POINTERS
struct CppHeapPointerT : Uint32T {
static constexpr MachineType kMachineType = MachineType::Uint32();
};
#else // !V8_COMPRESS_POINTERS
struct CppHeapPointerT : UntaggedT {
static constexpr MachineType kMachineType = MachineType::Pointer();
};
#endif // !V8_COMPRESS_POINTERS
struct Float16RawBitsT : Word32T {
static constexpr MachineType kMachineType = MachineType::Uint16();
};
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
#ifdef V8_ENABLE_SANDBOX
using TrustedPointerT = IndirectPointerHandleT;
#else
using TrustedPointerT = TaggedT;
#endif
// Result of a comparison operation.
struct BoolT : Word32T {
static constexpr MachineType kMachineType = MachineType::Int32();
};
// Value type of a Turbofan node with two results.
template <class T1, class T2>
struct PairT {};
struct Simd128T : UntaggedT {
static const MachineRepresentation kMachineRepresentation =
MachineRepresentation::kSimd128;
static constexpr MachineType kMachineType = MachineType::Simd128();
};
struct I8x16T : Simd128T {};
struct I16x8T : Simd128T {};
struct I32x2T : Simd128T {};
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<MaybeWeak<HeapObject>> {
// TODO(leszeks): Can this be TaggedPointer?
static constexpr MachineType value = MachineType::AnyTagged();
};
template <>
struct MachineTypeOf<HeapObject> {
static constexpr MachineType value = MachineType::TaggedPointer();
};
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,
std::enable_if_t<std::is_base_of_v<HeapObject, HeapObjectSubtype> ||
std::is_base_of_v<HeapObjectLayout, HeapObjectSubtype>>> {
static constexpr MachineType value = MachineType::TaggedPointer();
};
template <class HeapObjectSubtype>
constexpr MachineType MachineTypeOf<
HeapObjectSubtype,
std::enable_if_t<std::is_base_of_v<HeapObject, HeapObjectSubtype> ||
std::is_base_of_v<HeapObjectLayout, HeapObjectSubtype>>>::
value;
template <>
struct MachineTypeOf<ExternalReference> {
static constexpr MachineType value = MachineType::Pointer();
};
template <class T>
struct MachineTypeOf<Union<T>> {
static constexpr MachineType value = MachineTypeOf<T>::value;
};
template <class T, class... Ts>
struct MachineTypeOf<Union<T, Ts...>> {
static constexpr MachineType value = CommonMachineType(
MachineTypeOf<T>::value, MachineTypeOf<Union<Ts...>>::value);
static_assert(value.representation() != MachineRepresentation::kNone,
"no common representation");
};
// Special case for Union<HeapObject,TaggedIndex>, which torque uses for
// TaggedZeroPattern and can be treated as an AnyTagged
template <>
struct MachineTypeOf<Union<HeapObject, TaggedIndex>> {
static constexpr MachineType value = MachineType::AnyTagged();
};
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, std::void_t<decltype(T::kMachineType)>> {
static constexpr MachineRepresentation value =
T::kMachineType.representation();
};
template <class T>
struct MachineRepresentationOf<T, std::enable_if_t<is_taggable_v<T>>> {
static constexpr MachineRepresentation value =
MachineTypeOf<T>::value.representation();
};
template <>
struct MachineRepresentationOf<ExternalReference> {
static constexpr MachineRepresentation value =
RawPtrT::kMachineRepresentation;
};
template <typename T>
constexpr bool IsMachineRepresentationOf(MachineRepresentation r) {
return MachineRepresentationOf<T>::value == r;
}
template <class T>
constexpr MachineRepresentation PhiMachineRepresentationOf =
std::is_base_of<Word32T, T>::value ? MachineRepresentation::kWord32
: MachineRepresentationOf<T>::value;
template <class T>
struct is_valid_type_tag {
static const bool value = is_taggable_v<T> ||
std::is_base_of<UntaggedT, T>::value ||
std::is_same<ExternalReference, T>::value;
static const bool is_tagged = is_taggable_v<T>;
};
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... T>
struct is_valid_type_tag<Union<T...>> {
static const bool is_tagged = (is_valid_type_tag<T>::is_tagged && ...);
static const bool value = is_tagged;
static_assert(is_tagged, "union types are only possible for tagged values");
};
using AnyTaggedT = UnionOf<Object, MaybeObject>;
using ContextOrEmptyContext = UnionOf<Context, Smi>;
// A pointer to a builtin function, used by Torque's function pointers.
using BuiltinPtr = Smi;
template <>
struct is_subtype<ExternalReference, RawPtrT> {
static const bool value = true;
};
template <>
struct is_subtype<IntPtrT, RawPtrT> {
static const bool value = true;
};
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<AdditiveSafeIntegerT, 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... Ts, class U>
struct types_have_common_values<Union<Ts...>, U> {
static const bool value =
std::disjunction_v<types_have_common_values<Ts, U>...>;
};
template <class T, class... Us>
struct types_have_common_values<T, Union<Us...>> {
static const bool value =
std::disjunction_v<types_have_common_values<T, Us>...>;
};
template <class... Ts, class... Us>
struct types_have_common_values<Union<Ts...>, Union<Us...>> {
static const bool value =
std::disjunction_v<types_have_common_values<Ts, Union<Us...>>...>;
};
// 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
// - UnionOf<T1, T2, ...> represents a value of one of types T1, T2, etc.
template <class T>
class TNode {
public:
template <class U>
TNode(const TNode<U>& other) V8_NOEXCEPT
requires(is_subtype<U, T>::value)
: node_(other.node_) {
LazyTemplateChecks();
}
TNode(const TNode& other) V8_NOEXCEPT : node_(other.node_) {}
TNode() : node_(nullptr) {}
TNode operator=(TNode other) {
DCHECK_NOT_NULL(other.node_);
node_ = other.node_;
return *this;
}
operator compiler::Node*() const { return node_; }
explicit operator bool() const { return node_ != nullptr; }
static TNode UncheckedCast(compiler::Node* node) { return TNode(node); }
protected:
template <typename U>
friend class TNode;
explicit TNode(compiler::Node* node) : node_(node) { LazyTemplateChecks(); }
// These checks shouldn't be checked before TNode is actually used.
void LazyTemplateChecks() const {
static_assert(is_valid_type_tag<T>::value, "invalid type tag");
}
compiler::Node* node_;
};
template <class T>
class TNode<Tagged<T>> {
static_assert(!std::is_same_v<T, T>,
"Don't write TNode<Tagged<T>>, just write TNode<T> directly.");
};
// 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(turbofan): 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>
SloppyTNode(const TNode<U>& other) V8_NOEXCEPT // NOLINT(runtime/explicit)
requires(is_subtype<U, T>::value)
: TNode<T>(other) {}
};
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_TNODE_H_