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//===-- lib/Evaluate/fold.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "flang/Evaluate/fold.h"
#include "fold-implementation.h"
namespace Fortran::evaluate {
std::optional<Constant<SubscriptInteger>> GetConstantSubscript(
FoldingContext &context, Subscript &ss, const NamedEntity &base, int dim) {
ss = FoldOperation(context, std::move(ss));
return std::visit(
common::visitors{
[](IndirectSubscriptIntegerExpr &expr)
-> std::optional<Constant<SubscriptInteger>> {
if (const auto *constant{
UnwrapConstantValue<SubscriptInteger>(expr.value())}) {
return *constant;
} else {
return std::nullopt;
}
},
[&](Triplet &triplet) -> std::optional<Constant<SubscriptInteger>> {
auto lower{triplet.lower()}, upper{triplet.upper()};
std::optional<ConstantSubscript> stride{ToInt64(triplet.stride())};
if (!lower) {
lower = GetLowerBound(context, base, dim);
}
if (!upper) {
upper =
ComputeUpperBound(context, GetLowerBound(context, base, dim),
GetExtent(context, base, dim));
}
auto lbi{ToInt64(lower)}, ubi{ToInt64(upper)};
if (lbi && ubi && stride && *stride != 0) {
std::vector<SubscriptInteger::Scalar> values;
while ((*stride > 0 && *lbi <= *ubi) ||
(*stride < 0 && *lbi >= *ubi)) {
values.emplace_back(*lbi);
*lbi += *stride;
}
return Constant<SubscriptInteger>{std::move(values),
ConstantSubscripts{
static_cast<ConstantSubscript>(values.size())}};
} else {
return std::nullopt;
}
},
},
ss.u);
}
// TODO: Put this in a more central location if it would be useful elsewhere
class ScalarConstantExpander {
public:
explicit ScalarConstantExpander(ConstantSubscripts &extents)
: extents_{extents} {}
template <typename A> A Expand(A &&x) const {
return std::move(x); // default case
}
template <typename T> Constant<T> Expand(Constant<T> &&x) {
return x.Reshape(std::move(extents_));
}
template <typename T> Expr<T> Expand(Expr<T> &&x) {
return std::visit([&](auto &&x) { return Expr<T>{Expand(std::move(x))}; },
std::move(x.u));
}
private:
ConstantSubscripts &extents_;
};
Expr<SomeDerived> FoldOperation(
FoldingContext &context, StructureConstructor &&structure) {
StructureConstructor ctor{structure.derivedTypeSpec()};
bool constantExtents{true};
for (auto &&[symbol, value] : std::move(structure)) {
auto expr{Fold(context, std::move(value.value()))};
if (!IsProcedurePointer(symbol)) {
if (auto valueShape{GetConstantExtents(context, expr)}) {
if (!IsPointer(symbol)) {
if (auto componentShape{GetConstantExtents(context, symbol)}) {
if (GetRank(*componentShape) > 0 && GetRank(*valueShape) == 0) {
expr = ScalarConstantExpander{*componentShape}.Expand(
std::move(expr));
constantExtents = constantExtents && expr.Rank() > 0;
} else {
constantExtents =
constantExtents && *valueShape == *componentShape;
}
} else {
constantExtents = false;
}
}
} else {
constantExtents = false;
}
}
ctor.Add(symbol, Fold(context, std::move(expr)));
}
if (constantExtents && IsConstantExpr(ctor)) {
return Expr<SomeDerived>{Constant<SomeDerived>{std::move(ctor)}};
} else {
return Expr<SomeDerived>{std::move(ctor)};
}
}
Component FoldOperation(FoldingContext &context, Component &&component) {
return {FoldOperation(context, std::move(component.base())),
component.GetLastSymbol()};
}
NamedEntity FoldOperation(FoldingContext &context, NamedEntity &&x) {
if (Component * c{x.UnwrapComponent()}) {
return NamedEntity{FoldOperation(context, std::move(*c))};
} else {
return std::move(x);
}
}
Triplet FoldOperation(FoldingContext &context, Triplet &&triplet) {
MaybeExtentExpr lower{triplet.lower()};
MaybeExtentExpr upper{triplet.upper()};
return {Fold(context, std::move(lower)), Fold(context, std::move(upper)),
Fold(context, triplet.stride())};
}
Subscript FoldOperation(FoldingContext &context, Subscript &&subscript) {
return std::visit(common::visitors{
[&](IndirectSubscriptIntegerExpr &&expr) {
expr.value() = Fold(context, std::move(expr.value()));
return Subscript(std::move(expr));
},
[&](Triplet &&triplet) {
return Subscript(
FoldOperation(context, std::move(triplet)));
},
},
std::move(subscript.u));
}
ArrayRef FoldOperation(FoldingContext &context, ArrayRef &&arrayRef) {
NamedEntity base{FoldOperation(context, std::move(arrayRef.base()))};
for (Subscript &subscript : arrayRef.subscript()) {
subscript = FoldOperation(context, std::move(subscript));
}
return ArrayRef{std::move(base), std::move(arrayRef.subscript())};
}
CoarrayRef FoldOperation(FoldingContext &context, CoarrayRef &&coarrayRef) {
std::vector<Subscript> subscript;
for (Subscript x : coarrayRef.subscript()) {
subscript.emplace_back(FoldOperation(context, std::move(x)));
}
std::vector<Expr<SubscriptInteger>> cosubscript;
for (Expr<SubscriptInteger> x : coarrayRef.cosubscript()) {
cosubscript.emplace_back(Fold(context, std::move(x)));
}
CoarrayRef folded{std::move(coarrayRef.base()), std::move(subscript),
std::move(cosubscript)};
if (std::optional<Expr<SomeInteger>> stat{coarrayRef.stat()}) {
folded.set_stat(Fold(context, std::move(*stat)));
}
if (std::optional<Expr<SomeInteger>> team{coarrayRef.team()}) {
folded.set_team(
Fold(context, std::move(*team)), coarrayRef.teamIsTeamNumber());
}
return folded;
}
DataRef FoldOperation(FoldingContext &context, DataRef &&dataRef) {
return std::visit(common::visitors{
[&](SymbolRef symbol) { return DataRef{*symbol}; },
[&](auto &&x) {
return DataRef{FoldOperation(context, std::move(x))};
},
},
std::move(dataRef.u));
}
Substring FoldOperation(FoldingContext &context, Substring &&substring) {
auto lower{Fold(context, substring.lower())};
auto upper{Fold(context, substring.upper())};
if (const DataRef * dataRef{substring.GetParentIf<DataRef>()}) {
return Substring{FoldOperation(context, DataRef{*dataRef}),
std::move(lower), std::move(upper)};
} else {
auto p{*substring.GetParentIf<StaticDataObject::Pointer>()};
return Substring{std::move(p), std::move(lower), std::move(upper)};
}
}
ComplexPart FoldOperation(FoldingContext &context, ComplexPart &&complexPart) {
DataRef complex{complexPart.complex()};
return ComplexPart{
FoldOperation(context, std::move(complex)), complexPart.part()};
}
std::optional<std::int64_t> GetInt64Arg(
const std::optional<ActualArgument> &arg) {
if (const auto *intExpr{UnwrapExpr<Expr<SomeInteger>>(arg)}) {
return ToInt64(*intExpr);
} else {
return std::nullopt;
}
}
std::optional<std::int64_t> GetInt64ArgOr(
const std::optional<ActualArgument> &arg, std::int64_t defaultValue) {
if (!arg) {
return defaultValue;
} else if (const auto *intExpr{UnwrapExpr<Expr<SomeInteger>>(arg)}) {
return ToInt64(*intExpr);
} else {
return std::nullopt;
}
}
Expr<ImpliedDoIndex::Result> FoldOperation(
FoldingContext &context, ImpliedDoIndex &&iDo) {
if (std::optional<ConstantSubscript> value{context.GetImpliedDo(iDo.name)}) {
return Expr<ImpliedDoIndex::Result>{*value};
} else {
return Expr<ImpliedDoIndex::Result>{std::move(iDo)};
}
}
template class ExpressionBase<SomeDerived>;
template class ExpressionBase<SomeType>;
} // namespace Fortran::evaluate
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