b861018e3a
Original-commit: flang-compiler/f18@6f1ef45b2f Reviewed-on: https://github.com/flang-compiler/f18/pull/162 Tree-same-pre-rewrite: false
674 lines
25 KiB
C++
674 lines
25 KiB
C++
// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FORTRAN_EVALUATE_EXPRESSION_H_
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#define FORTRAN_EVALUATE_EXPRESSION_H_
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// Represent Fortran expressions in a type-safe manner.
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// Expressions are the sole owners of their constituents; i.e., there is no
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// context-independent hash table or sharing of common subexpressions.
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// Both deep copy and move semantics are supported for expression construction
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// and manipulation in place.
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#include "common.h"
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#include "expression-forward.h"
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#include "type.h"
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#include "variable.h"
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#include "../lib/common/idioms.h"
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#include "../lib/parser/char-block.h"
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#include "../lib/parser/message.h"
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#include <ostream>
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#include <variant>
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namespace Fortran::evaluate {
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CLASS_TRAIT(FoldableTrait);
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struct FoldingContext {
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parser::ContextualMessages &messages;
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Rounding rounding{defaultRounding};
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bool flushDenormalsToZero{false};
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};
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// Helper base classes for packaging subexpressions.
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template<typename CRTP, typename RESULT, typename A = RESULT> class Unary {
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protected:
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using OperandType = A;
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using Operand = Expr<OperandType>;
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using OperandScalarConstant = typename OperandType::Value;
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public:
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using Result = RESULT;
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using Scalar = typename Result::Value;
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using FoldableTrait = std::true_type;
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CLASS_BOILERPLATE(Unary)
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Unary(const Operand &a) : operand_{a} {}
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Unary(Operand &&a) : operand_{std::move(a)} {}
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Unary(CopyableIndirection<Operand> &&a) : operand_{std::move(a)} {}
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const Operand &operand() const { return *operand_; }
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Operand &operand() { return *operand_; }
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std::ostream &Dump(std::ostream &, const char *opr) const;
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int Rank() const { return operand_.Rank(); }
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std::optional<Scalar> Fold(FoldingContext &); // TODO: array result
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private:
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CopyableIndirection<Operand> operand_;
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};
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template<typename CRTP, typename RESULT, typename A = RESULT, typename B = A>
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class Binary {
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protected:
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using LeftType = A;
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using Left = Expr<LeftType>;
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using LeftScalar = typename LeftType::Value;
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using RightType = B;
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using Right = Expr<RightType>;
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using RightScalar = typename RightType::Value;
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public:
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using Result = RESULT;
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using Scalar = typename Result::Value;
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using FoldableTrait = std::true_type;
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CLASS_BOILERPLATE(Binary)
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Binary(const Left &a, const Right &b) : left_{a}, right_{b} {}
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Binary(Left &&a, Right &&b) : left_{std::move(a)}, right_{std::move(b)} {}
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Binary(
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CopyableIndirection<const Left> &&a, CopyableIndirection<const Right> &&b)
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: left_{std::move(a)}, right_{std::move(b)} {}
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const Left &left() const { return *left_; }
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Left &left() { return *left_; }
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const Right &right() const { return *right_; }
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Right &right() { return *right_; }
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std::ostream &Dump(
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std::ostream &, const char *opr, const char *before = "(") const;
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int Rank() const;
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std::optional<Scalar> Fold(FoldingContext &);
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private:
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CopyableIndirection<Left> left_;
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CopyableIndirection<Right> right_;
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};
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// Per-category expressions
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template<int KIND> class Expr<Type<Category::Integer, KIND>> {
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public:
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using Result = Type<Category::Integer, KIND>;
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using Scalar = typename Result::Value;
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using FoldableTrait = std::true_type;
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struct ConvertInteger
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: public Unary<ConvertInteger, Result, AnyKindType<Category::Integer>> {
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using Unary<ConvertInteger, Result, AnyKindType<Category::Integer>>::Unary;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const ScalarConstant<Category::Integer> &);
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};
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struct ConvertReal
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: public Unary<ConvertReal, Result, AnyKindType<Category::Real>> {
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using Unary<ConvertReal, Result, AnyKindType<Category::Real>>::Unary;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const ScalarConstant<Category::Real> &);
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};
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template<typename CRTP> using Un = Unary<CRTP, Result>;
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template<typename CRTP> using Bin = Binary<CRTP, Result>;
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struct Parentheses : public Un<Parentheses> {
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using Un<Parentheses>::Un;
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static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &x) {
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return {x};
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}
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};
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struct Negate : public Un<Negate> {
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using Un<Negate>::Un;
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static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &);
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};
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struct Add : public Bin<Add> {
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using Bin<Add>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Subtract : public Bin<Subtract> {
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using Bin<Subtract>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Multiply : public Bin<Multiply> {
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using Bin<Multiply>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Divide : public Bin<Divide> {
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using Bin<Divide>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Power : public Bin<Power> {
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using Bin<Power>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Max : public Bin<Max> {
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using Bin<Max>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Min : public Bin<Min> {
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using Bin<Min>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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// TODO: R916 type-param-inquiry
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CLASS_BOILERPLATE(Expr)
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Expr(const Scalar &x) : u_{x} {}
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Expr(std::int64_t n) : u_{Scalar{n}} {}
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Expr(std::uint64_t n) : u_{Scalar{n}} {}
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Expr(int n) : u_{Scalar{n}} {}
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template<int K>
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Expr(const IntegerExpr<K> &x) : u_{ConvertInteger{AnyKindIntegerExpr{x}}} {}
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template<int K>
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Expr(IntegerExpr<K> &&x)
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: u_{ConvertInteger{AnyKindIntegerExpr{std::move(x)}}} {}
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template<int K>
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Expr(const RealExpr<K> &x) : u_{ConvertReal{AnyKindRealExpr{x}}} {}
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template<int K>
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Expr(RealExpr<K> &&x) : u_{ConvertReal{AnyKindRealExpr{std::move(x)}}} {}
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template<typename A> Expr(const A &x) : u_{x} {}
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template<typename A>
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Expr(std::enable_if_t<!std::is_reference_v<A> &&
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(std::is_base_of_v<Un, A> || std::is_base_of_v<Bin, A>),
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A> &&x)
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: u_(std::move(x)) {}
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template<typename A> Expr(CopyableIndirection<A> &&x) : u_{std::move(x)} {}
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std::optional<Scalar> ScalarValue() const {
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return common::GetIf<Scalar>(u_);
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}
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std::optional<Scalar> Fold(FoldingContext &c);
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private:
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std::variant<Scalar, CopyableIndirection<DataRef>,
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CopyableIndirection<FunctionRef>, ConvertInteger, ConvertReal,
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Parentheses, Negate, Add, Subtract, Multiply, Divide, Power, Max, Min>
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u_;
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};
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template<int KIND> class Expr<Type<Category::Real, KIND>> {
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public:
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using Result = Type<Category::Real, KIND>;
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using Scalar = typename Result::Value;
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using FoldableTrait = std::true_type;
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// N.B. Real->Complex and Complex->Real conversions are done with CMPLX
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// and part access operations (resp.). Conversions between kinds of
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// Complex are done via decomposition to Real and reconstruction.
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struct ConvertInteger
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: public Unary<ConvertInteger, Result, AnyKindType<Category::Integer>> {
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using Unary<ConvertInteger, Result, AnyKindType<Category::Integer>>::Unary;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const ScalarConstant<Category::Integer> &);
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};
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struct ConvertReal
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: public Unary<ConvertReal, Result, AnyKindType<Category::Real>> {
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using Unary<ConvertReal, Result, AnyKindType<Category::Real>>::Unary;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const ScalarConstant<Category::Real> &);
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};
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template<typename CRTP> using Un = Unary<CRTP, Result>;
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template<typename CRTP> using Bin = Binary<CRTP, Result>;
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struct Parentheses : public Un<Parentheses> {
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using Un<Parentheses>::Un;
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static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &x) {
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return {x};
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}
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};
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struct Negate : public Un<Negate> {
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using Un<Negate>::Un;
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static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &);
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};
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struct Add : public Bin<Add> {
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using Bin<Add>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Subtract : public Bin<Subtract> {
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using Bin<Subtract>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Multiply : public Bin<Multiply> {
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using Bin<Multiply>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Divide : public Bin<Divide> {
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using Bin<Divide>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Power : public Bin<Power> {
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using Bin<Power>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct IntPower
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: public Binary<IntPower, Result, Result, AnyKindType<Category::Integer>> {
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using Binary<IntPower, Result, Result,
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AnyKindType<Category::Integer>>::Binary;
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static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &,
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const ScalarConstant<Category::Integer> &);
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};
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struct Max : public Bin<Max> {
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using Bin<Max>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Min : public Bin<Min> {
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using Bin<Min>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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using Cplx = Type<Category::Complex, KIND>;
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using CplxScalar = typename Cplx::Value;
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template<typename CRTP> using CplxUn = Unary<CRTP, Result, Cplx>;
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struct RealPart : public CplxUn<RealPart> {
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using CplxUn<RealPart>::CplxUn;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const CplxScalar &);
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};
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struct AIMAG : public CplxUn<AIMAG> {
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using CplxUn<AIMAG>::CplxUn;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const CplxScalar &);
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};
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CLASS_BOILERPLATE(Expr)
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Expr(const Scalar &x) : u_{x} {}
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template<int K>
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Expr(const IntegerExpr<K> &x) : u_{ConvertInteger{AnyKindIntegerExpr{x}}} {}
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template<int K>
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Expr(IntegerExpr<K> &&x)
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: u_{ConvertInteger{AnyKindIntegerExpr{std::move(x)}}} {}
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template<int K>
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Expr(const RealExpr<K> &x) : u_{ConvertReal{AnyKindRealExpr{x}}} {}
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template<int K>
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Expr(RealExpr<K> &&x) : u_{ConvertReal{AnyKindRealExpr{std::move(x)}}} {}
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template<typename A> Expr(const A &x) : u_{x} {}
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template<typename A>
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Expr(std::enable_if_t<!std::is_reference_v<A>, A> &&x) : u_{std::move(x)} {}
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template<typename A> Expr(CopyableIndirection<A> &&x) : u_{std::move(x)} {}
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std::optional<Scalar> ScalarValue() const {
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return common::GetIf<Scalar>(u_);
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}
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std::optional<Scalar> Fold(FoldingContext &c);
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private:
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std::variant<Scalar, CopyableIndirection<DataRef>,
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CopyableIndirection<ComplexPart>, CopyableIndirection<FunctionRef>,
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ConvertInteger, ConvertReal, Parentheses, Negate, Add, Subtract, Multiply,
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Divide, Power, IntPower, Max, Min, RealPart, AIMAG>
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u_;
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};
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template<int KIND> class Expr<Type<Category::Complex, KIND>> {
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public:
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using Result = Type<Category::Complex, KIND>;
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using Scalar = typename Result::Value;
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using FoldableTrait = std::true_type;
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template<typename CRTP> using Un = Unary<CRTP, Result>;
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template<typename CRTP> using Bin = Binary<CRTP, Result>;
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struct Parentheses : public Un<Parentheses> {
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using Un<Parentheses>::Un;
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static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &x) {
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return {x};
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}
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};
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struct Negate : public Un<Negate> {
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using Un<Negate>::Un;
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static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &);
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};
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struct Add : public Bin<Add> {
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using Bin<Add>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Subtract : public Bin<Subtract> {
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using Bin<Subtract>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Multiply : public Bin<Multiply> {
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using Bin<Multiply>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Divide : public Bin<Divide> {
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using Bin<Divide>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct Power : public Bin<Power> {
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using Bin<Power>::Bin;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const Scalar &, const Scalar &);
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};
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struct IntPower
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: public Binary<IntPower, Result, Result, AnyKindType<Category::Integer>> {
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using Binary<IntPower, Result, Result,
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AnyKindType<Category::Integer>>::Binary;
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static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &,
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const ScalarConstant<Category::Integer> &);
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};
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using Part = Type<Category::Real, KIND>;
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using PartScalar = typename Part::Value;
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struct CMPLX : public Binary<CMPLX, Result, Part> {
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using Binary<CMPLX, Result, Part>::Binary;
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static std::optional<Scalar> FoldScalar(
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FoldingContext &, const PartScalar &, const PartScalar &);
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};
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CLASS_BOILERPLATE(Expr)
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Expr(const Scalar &x) : u_{x} {}
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template<typename A> Expr(const A &x) : u_{x} {}
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template<typename A>
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Expr(std::enable_if_t<!std::is_reference_v<A>, A> &&x) : u_{std::move(x)} {}
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template<typename A> Expr(CopyableIndirection<A> &&x) : u_{std::move(x)} {}
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std::optional<Scalar> ScalarValue() const {
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return common::GetIf<Scalar>(u_);
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}
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std::optional<Scalar> Fold(FoldingContext &c);
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private:
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std::variant<Scalar, CopyableIndirection<DataRef>,
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CopyableIndirection<FunctionRef>, Parentheses, Negate, Add, Subtract,
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Multiply, Divide, Power, IntPower, CMPLX>
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u_;
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};
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template<int KIND> class Expr<Type<Category::Character, KIND>> {
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public:
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using Result = Type<Category::Character, KIND>;
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using Scalar = typename Result::Value;
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using FoldableTrait = std::true_type;
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template<typename CRTP> using Bin = Binary<CRTP, Result>;
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struct Concat : public Bin<Concat> {
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using Bin<Concat>::Bin;
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};
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struct Max : public Bin<Max> {
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using Bin<Max>::Bin;
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};
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struct Min : public Bin<Min> {
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using Bin<Min>::Bin;
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};
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CLASS_BOILERPLATE(Expr)
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Expr(const Scalar &x) : u_{x} {}
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Expr(Scalar &&x) : u_{std::move(x)} {}
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template<typename A> Expr(const A &x) : u_{x} {}
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template<typename A>
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Expr(std::enable_if_t<!std::is_reference_v<A>, A> &&x) : u_{std::move(x)} {}
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template<typename A> Expr(CopyableIndirection<A> &&x) : u_{std::move(x)} {}
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std::optional<Scalar> ScalarValue() const {
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return common::GetIf<Scalar>(u_);
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}
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std::optional<Scalar> Fold(FoldingContext &c);
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SubscriptIntegerExpr LEN() const;
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private:
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std::variant<Scalar, CopyableIndirection<DataRef>,
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CopyableIndirection<Substring>, CopyableIndirection<FunctionRef>, Concat,
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Max, Min>
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u_;
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};
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// The Comparison class template is a helper for constructing logical
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// expressions with polymorphism over the cross product of the possible
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// categories and kinds of comparable operands.
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ENUM_CLASS(RelationalOperator, LT, LE, EQ, NE, GE, GT)
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template<typename A>
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struct Comparison
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: public Binary<Comparison<A>, Type<Category::Logical, 1>, A> {
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using Base = Binary<Comparison, Type<Category::Logical, 1>, A>;
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using typename Base::Scalar;
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using OperandScalarConstant = typename Base::LeftScalar;
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CLASS_BOILERPLATE(Comparison)
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Comparison(RelationalOperator r, const Expr<A> &a, const Expr<A> &b)
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: Base{a, b}, opr{r} {}
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Comparison(RelationalOperator r, Expr<A> &&a, Expr<A> &&b)
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: Base{std::move(a), std::move(b)}, opr{r} {}
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std::optional<Scalar> FoldScalar(FoldingContext &c,
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const OperandScalarConstant &, const OperandScalarConstant &);
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RelationalOperator opr;
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};
|
|
|
|
extern template struct Comparison<Type<Category::Integer, 1>>;
|
|
extern template struct Comparison<Type<Category::Integer, 2>>;
|
|
extern template struct Comparison<Type<Category::Integer, 4>>;
|
|
extern template struct Comparison<Type<Category::Integer, 8>>;
|
|
extern template struct Comparison<Type<Category::Integer, 16>>;
|
|
extern template struct Comparison<Type<Category::Real, 2>>;
|
|
extern template struct Comparison<Type<Category::Real, 4>>;
|
|
extern template struct Comparison<Type<Category::Real, 8>>;
|
|
extern template struct Comparison<Type<Category::Real, 10>>;
|
|
extern template struct Comparison<Type<Category::Real, 16>>;
|
|
extern template struct Comparison<Type<Category::Complex, 2>>;
|
|
extern template struct Comparison<Type<Category::Complex, 4>>;
|
|
extern template struct Comparison<Type<Category::Complex, 8>>;
|
|
extern template struct Comparison<Type<Category::Complex, 10>>;
|
|
extern template struct Comparison<Type<Category::Complex, 16>>;
|
|
extern template struct Comparison<Type<Category::Character, 1>>;
|
|
|
|
// Dynamically polymorphic comparisons whose operands are expressions of
|
|
// the same supported kind of a particular type category.
|
|
template<Category CAT> struct CategoryComparison {
|
|
using Scalar = typename Type<Category::Logical, 1>::Value;
|
|
CLASS_BOILERPLATE(CategoryComparison)
|
|
template<int KIND> using KindComparison = Comparison<Type<CAT, KIND>>;
|
|
template<int KIND> CategoryComparison(const KindComparison<KIND> &x) : u{x} {}
|
|
template<int KIND>
|
|
CategoryComparison(KindComparison<KIND> &&x) : u{std::move(x)} {}
|
|
std::optional<Scalar> Fold(FoldingContext &c);
|
|
typename KindsVariant<CAT, KindComparison>::type u;
|
|
};
|
|
|
|
template<int KIND> class Expr<Type<Category::Logical, KIND>> {
|
|
public:
|
|
using Result = Type<Category::Logical, KIND>;
|
|
using Scalar = typename Result::Value;
|
|
using FoldableTrait = std::true_type;
|
|
struct Not : Unary<Not, Result> {
|
|
using Unary<Not, Result>::Unary;
|
|
static std::optional<Scalar> FoldScalar(FoldingContext &, const Scalar &);
|
|
};
|
|
template<typename CRTP> using Bin = Binary<CRTP, Result>;
|
|
struct And : public Bin<And> {
|
|
using Bin<And>::Bin;
|
|
static std::optional<Scalar> FoldScalar(
|
|
FoldingContext &, const Scalar &, const Scalar &);
|
|
};
|
|
struct Or : public Bin<Or> {
|
|
using Bin<Or>::Bin;
|
|
static std::optional<Scalar> FoldScalar(
|
|
FoldingContext &, const Scalar &, const Scalar &);
|
|
};
|
|
struct Eqv : public Bin<Eqv> {
|
|
using Bin<Eqv>::Bin;
|
|
static std::optional<Scalar> FoldScalar(
|
|
FoldingContext &, const Scalar &, const Scalar &);
|
|
};
|
|
struct Neqv : public Bin<Neqv> {
|
|
using Bin<Neqv>::Bin;
|
|
static std::optional<Scalar> FoldScalar(
|
|
FoldingContext &, const Scalar &, const Scalar &);
|
|
};
|
|
|
|
CLASS_BOILERPLATE(Expr)
|
|
Expr(const Scalar &x) : u_{x} {}
|
|
Expr(bool x) : u_{Scalar{x}} {}
|
|
template<Category CAT, int K>
|
|
Expr(const Comparison<Type<CAT, K>> &x) : u_{CategoryComparison<CAT>{x}} {}
|
|
template<Category CAT, int K>
|
|
Expr(Comparison<Type<CAT, K>> &&x)
|
|
: u_{CategoryComparison<CAT>{std::move(x)}} {}
|
|
template<typename A> Expr(const A &x) : u_(x) {}
|
|
template<typename A>
|
|
Expr(std::enable_if_t<!std::is_reference_v<A>, A> &&x) : u_{std::move(x)} {}
|
|
template<typename A> Expr(CopyableIndirection<A> &&x) : u_{std::move(x)} {}
|
|
|
|
std::optional<Scalar> ScalarValue() const {
|
|
return common::GetIf<Scalar>(u_);
|
|
}
|
|
std::optional<Scalar> Fold(FoldingContext &c);
|
|
|
|
private:
|
|
std::variant<Scalar, CopyableIndirection<DataRef>,
|
|
CopyableIndirection<FunctionRef>, Not, And, Or, Eqv, Neqv,
|
|
CategoryComparison<Category::Integer>, CategoryComparison<Category::Real>,
|
|
CategoryComparison<Category::Complex>,
|
|
CategoryComparison<Category::Character>>
|
|
u_;
|
|
};
|
|
|
|
extern template class Expr<Type<Category::Integer, 1>>;
|
|
extern template class Expr<Type<Category::Integer, 2>>;
|
|
extern template class Expr<Type<Category::Integer, 4>>;
|
|
extern template class Expr<Type<Category::Integer, 8>>;
|
|
extern template class Expr<Type<Category::Integer, 16>>;
|
|
extern template class Expr<Type<Category::Real, 2>>;
|
|
extern template class Expr<Type<Category::Real, 4>>;
|
|
extern template class Expr<Type<Category::Real, 8>>;
|
|
extern template class Expr<Type<Category::Real, 10>>;
|
|
extern template class Expr<Type<Category::Real, 16>>;
|
|
extern template class Expr<Type<Category::Complex, 2>>;
|
|
extern template class Expr<Type<Category::Complex, 4>>;
|
|
extern template class Expr<Type<Category::Complex, 8>>;
|
|
extern template class Expr<Type<Category::Complex, 10>>;
|
|
extern template class Expr<Type<Category::Complex, 16>>;
|
|
extern template class Expr<Type<Category::Character, 1>>;
|
|
extern template class Expr<Type<Category::Logical, 1>>;
|
|
extern template class Expr<Type<Category::Logical, 2>>;
|
|
extern template class Expr<Type<Category::Logical, 4>>;
|
|
extern template class Expr<Type<Category::Logical, 8>>;
|
|
|
|
// Dynamically polymorphic expressions that can hold any supported kind
|
|
// of a specific intrinsic type category.
|
|
template<Category CAT> class Expr<AnyKindType<CAT>> {
|
|
public:
|
|
using Result = AnyKindType<CAT>;
|
|
using Scalar = typename Result::Value;
|
|
using FoldableTrait = std::true_type;
|
|
CLASS_BOILERPLATE(Expr)
|
|
template<int KIND> using KindExpr = Expr<Type<CAT, KIND>>;
|
|
template<int KIND> Expr(const KindExpr<KIND> &x) : u{x} {}
|
|
template<int KIND> Expr(KindExpr<KIND> &&x) : u{std::move(x)} {}
|
|
std::optional<Scalar> ScalarValue() const;
|
|
std::optional<Scalar> Fold(FoldingContext &);
|
|
typename KindsVariant<CAT, KindExpr>::type u;
|
|
};
|
|
|
|
extern template class Expr<AnyKindType<Category::Integer>>;
|
|
extern template class Expr<AnyKindType<Category::Real>>;
|
|
extern template class Expr<AnyKindType<Category::Complex>>;
|
|
extern template class Expr<AnyKindType<Category::Character>>;
|
|
extern template class Expr<AnyKindType<Category::Logical>>;
|
|
|
|
// A completely generic expression, polymorphic across the intrinsic type
|
|
// categories and each of their kinds.
|
|
struct GenericExpr {
|
|
using Scalar = GenericScalar;
|
|
using FoldableTrait = std::true_type;
|
|
CLASS_BOILERPLATE(GenericExpr)
|
|
template<Category CAT, int KIND>
|
|
GenericExpr(const Expr<Type<CAT, KIND>> &x) : u{Expr<AnyKindType<CAT>>{x}} {}
|
|
template<Category CAT, int KIND>
|
|
GenericExpr(Expr<Type<CAT, KIND>> &&x)
|
|
: u{Expr<AnyKindType<CAT>>{std::move(x)}} {}
|
|
template<typename A> GenericExpr(const A &x) : u{x} {}
|
|
template<typename A>
|
|
GenericExpr(std::enable_if_t<!std::is_reference_v<A>, A> &&x)
|
|
: u{std::move(x)} {}
|
|
std::optional<Scalar> ScalarValue() const;
|
|
std::optional<Scalar> Fold(FoldingContext &);
|
|
int Rank() const { return 1; } // TODO
|
|
std::variant<AnyKindIntegerExpr, AnyKindRealExpr, AnyKindComplexExpr,
|
|
AnyKindCharacterExpr, AnyKindLogicalExpr>
|
|
u;
|
|
};
|
|
|
|
// Convenience functions and operator overloadings for expression construction.
|
|
// These definitions are created with temporary helper macros to reduce
|
|
// C++ boilerplate. All combinations of lvalue and rvalue references are
|
|
// allowed for operands.
|
|
#define UNARY(FUNC, CONSTR) \
|
|
template<typename A> A FUNC(const A &x) { return {typename A::CONSTR{x}}; }
|
|
UNARY(Parentheses, Parentheses)
|
|
UNARY(operator-, Negate)
|
|
#undef UNARY
|
|
|
|
#define BINARY(FUNC, CONSTR) \
|
|
template<typename A> A FUNC(const A &x, const A &y) { \
|
|
return {typename A::CONSTR{x, y}}; \
|
|
} \
|
|
template<typename A> \
|
|
std::enable_if_t<!std::is_reference_v<A>, A> FUNC(const A &x, A &&y) { \
|
|
return {typename A::CONSTR{A{x}, std::move(y)}}; \
|
|
} \
|
|
template<typename A> \
|
|
std::enable_if_t<!std::is_reference_v<A>, A> FUNC(A &&x, const A &y) { \
|
|
return {typename A::CONSTR{std::move(x), A{y}}}; \
|
|
} \
|
|
template<typename A> \
|
|
std::enable_if_t<!std::is_reference_v<A>, A> FUNC(A &&x, A &&y) { \
|
|
return {typename A::CONSTR{std::move(x), std::move(y)}}; \
|
|
}
|
|
|
|
BINARY(operator+, Add)
|
|
BINARY(operator-, Subtract)
|
|
BINARY(operator*, Multiply)
|
|
BINARY(operator/, Divide)
|
|
BINARY(Power, Power)
|
|
#undef BINARY
|
|
|
|
#define BINARY(FUNC, OP) \
|
|
template<typename A> LogicalExpr<1> FUNC(const A &x, const A &y) { \
|
|
return {Comparison<typename A::Result>{OP, x, y}}; \
|
|
} \
|
|
template<typename A> \
|
|
std::enable_if_t<!std::is_reference_v<A>, LogicalExpr<1>> FUNC( \
|
|
const A &x, A &&y) { \
|
|
return {Comparison<typename A::Result>{OP, x, std::move(y)}}; \
|
|
} \
|
|
template<typename A> \
|
|
std::enable_if_t<!std::is_reference_v<A>, LogicalExpr<1>> FUNC( \
|
|
A &&x, const A &y) { \
|
|
return {Comparison<typename A::Result>{OP, std::move(x), y}}; \
|
|
} \
|
|
template<typename A> \
|
|
std::enable_if_t<!std::is_reference_v<A>, LogicalExpr<1>> FUNC( \
|
|
A &&x, A &&y) { \
|
|
return {Comparison<typename A::Result>{OP, std::move(x), std::move(y)}}; \
|
|
}
|
|
|
|
BINARY(operator<, RelationalOperator::LT)
|
|
BINARY(operator<=, RelationalOperator::LE)
|
|
BINARY(operator==, RelationalOperator::EQ)
|
|
BINARY(operator!=, RelationalOperator::NE)
|
|
BINARY(operator>=, RelationalOperator::GE)
|
|
BINARY(operator>, RelationalOperator::GT)
|
|
#undef BINARY
|
|
} // namespace Fortran::evaluate
|
|
#endif // FORTRAN_EVALUATE_EXPRESSION_H_
|