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llvm/flang/lib/semantics/expression.cc
peter klausler 9e9b9f0776 [flang] Pass tests 
Original-commit: flang-compiler/f18@ffb057f262
Reviewed-on: https://github.com/flang-compiler/f18/pull/371
Tree-same-pre-rewrite: false
2019-04-01 12:30:08 -07:00

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// Copyright (c) 2018-2019, NVIDIA CORPORATION. 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.
#include "expression.h"
#include "scope.h"
#include "semantics.h"
#include "symbol.h"
#include "tools.h"
#include "../common/idioms.h"
#include "../evaluate/common.h"
#include "../evaluate/fold.h"
#include "../evaluate/tools.h"
#include "../parser/characters.h"
#include "../parser/parse-tree-visitor.h"
#include "../parser/parse-tree.h"
#include <functional>
#include <optional>
#include <set>
// TODO pmk remove when scaffolding is obsolete
#undef PMKDEBUG // #define PMKDEBUG 1
#if PMKDEBUG
#include "../parser/dump-parse-tree.h"
#include <iostream>
#endif
// Typedef for optional generic expressions (ubiquitous in this file)
using MaybeExpr =
std::optional<Fortran::evaluate::Expr<Fortran::evaluate::SomeType>>;
namespace Fortran::parser {
bool SourceLocationFindingVisitor::Pre(const Expr &x) {
source = x.source;
return false;
}
void SourceLocationFindingVisitor::Post(const CharBlock &at) { source = at; }
}
// Much of the code that implements semantic analysis of expressions is
// tightly coupled with their typed representations in lib/evaluate,
// and appears here in namespace Fortran::evaluate for convenience.
namespace Fortran::evaluate {
using common::TypeCategory;
// If a generic expression simply wraps a DataRef, extract it.
// TODO: put in tools.h?
template<typename A> std::optional<DataRef> ExtractDataRef(A &&) {
return std::nullopt;
}
template<typename A> std::optional<DataRef> ExtractDataRef(Designator<A> &&d) {
return std::visit(
[](auto &&x) -> std::optional<DataRef> {
using Ty = std::decay_t<decltype(x)>;
if constexpr (common::HasMember<Ty, decltype(DataRef::u)>) {
return {DataRef{std::move(x)}};
}
return std::nullopt;
},
std::move(d.u));
}
template<TypeCategory CAT, int KIND>
std::optional<DataRef> ExtractDataRef(Expr<Type<CAT, KIND>> &&expr) {
using Ty = ResultType<decltype(expr)>;
if (auto *designator{std::get_if<Designator<Ty>>(&expr.u)}) {
return ExtractDataRef(std::move(*designator));
} else {
return std::nullopt;
}
}
template<TypeCategory CAT>
std::optional<DataRef> ExtractDataRef(Expr<SomeKind<CAT>> &&expr) {
return std::visit(
[](auto &&specificExpr) {
return ExtractDataRef(std::move(specificExpr));
},
std::move(expr.u));
}
static std::optional<DataRef> ExtractDataRef(Expr<SomeType> &&expr) {
return std::visit(
common::visitors{
[](BOZLiteralConstant &&) -> std::optional<DataRef> {
return std::nullopt;
},
[](NullPointer &&) -> std::optional<DataRef> { return std::nullopt; },
[](auto &&catExpr) { return ExtractDataRef(std::move(catExpr)); },
},
std::move(expr.u));
}
template<typename A>
std::optional<DataRef> ExtractDataRef(std::optional<A> &&x) {
if (x.has_value()) {
return ExtractDataRef(std::move(*x));
}
return std::nullopt;
}
struct DynamicTypeWithLength : public DynamicType {
std::optional<Expr<SubscriptInteger>> LEN() const;
std::optional<Expr<SubscriptInteger>> length;
};
std::optional<Expr<SubscriptInteger>> DynamicTypeWithLength::LEN() const {
if (length.has_value()) {
return length;
}
if (charLength != nullptr) {
if (const auto &len{charLength->GetExplicit()}) {
return ConvertToType<SubscriptInteger>(common::Clone(*len));
}
}
return std::nullopt;
}
static std::optional<DynamicTypeWithLength> AnalyzeTypeSpec(
const std::optional<parser::TypeSpec> &spec) {
if (spec.has_value()) {
if (const semantics::DeclTypeSpec * typeSpec{spec->declTypeSpec}) {
// Name resolution sets TypeSpec::declTypeSpec only when it's valid
// (viz., an intrinsic type with valid known kind or a non-polymorphic
// & non-ABSTRACT derived type).
if (const semantics::IntrinsicTypeSpec *
intrinsic{typeSpec->AsIntrinsic()}) {
TypeCategory category{intrinsic->category()};
if (auto optKind{ToInt64(intrinsic->kind())}) {
int kind{static_cast<int>(*optKind)};
if (category == TypeCategory::Character) {
const semantics::CharacterTypeSpec &cts{
typeSpec->characterTypeSpec()};
const semantics::ParamValue &len{cts.length()};
// N.B. CHARACTER(LEN=*) is allowed in type-specs in ALLOCATE() &
// type guards, but not in array constructors.
return DynamicTypeWithLength{DynamicType{kind, len}};
} else {
return DynamicTypeWithLength{DynamicType{category, kind}};
}
}
} else if (const semantics::DerivedTypeSpec *
derived{typeSpec->AsDerived()}) {
return DynamicTypeWithLength{DynamicType{*derived}};
}
}
}
return std::nullopt;
}
// Wraps a object in an explicitly typed representation (e.g., Designator<>
// or FunctionRef<>) that has been instantiated on a dynamically chosen type.
// TODO: move to tools.h?
template<TypeCategory CATEGORY, template<typename> typename WRAPPER,
typename WRAPPED>
MaybeExpr WrapperHelper(int kind, WRAPPED &&x) {
return common::SearchTypes(
TypeKindVisitor<CATEGORY, WRAPPER, WRAPPED>{kind, std::move(x)});
}
template<template<typename> typename WRAPPER, typename WRAPPED>
MaybeExpr TypedWrapper(const DynamicType &dyType, WRAPPED &&x) {
switch (dyType.category) {
case TypeCategory::Integer:
return WrapperHelper<TypeCategory::Integer, WRAPPER, WRAPPED>(
dyType.kind, std::move(x));
case TypeCategory::Real:
return WrapperHelper<TypeCategory::Real, WRAPPER, WRAPPED>(
dyType.kind, std::move(x));
case TypeCategory::Complex:
return WrapperHelper<TypeCategory::Complex, WRAPPER, WRAPPED>(
dyType.kind, std::move(x));
case TypeCategory::Character:
return WrapperHelper<TypeCategory::Character, WRAPPER, WRAPPED>(
dyType.kind, std::move(x));
case TypeCategory::Logical:
return WrapperHelper<TypeCategory::Logical, WRAPPER, WRAPPED>(
dyType.kind, std::move(x));
case TypeCategory::Derived:
return AsGenericExpr(Expr<SomeDerived>{WRAPPER<SomeDerived>{std::move(x)}});
default: CRASH_NO_CASE;
}
}
// Wraps a data reference in a typed Designator<>.
static MaybeExpr Designate(DataRef &&ref) {
if (std::optional<DynamicType> dyType{
GetSymbolType(ref.GetLastSymbol().GetUltimate())}) {
return TypedWrapper<Designator, DataRef>(
std::move(*dyType), std::move(ref));
}
// TODO: graceful errors on CLASS(*) and TYPE(*) misusage
return std::nullopt;
}
// Some subscript semantic checks must be deferred until all of the
// subscripts are in hand.
MaybeExpr ExpressionAnalyzer::CompleteSubscripts(ArrayRef &&ref) {
const Symbol &symbol{ref.GetLastSymbol().GetUltimate()};
int symbolRank{symbol.Rank()};
int subscripts = ref.size();
if (subscripts == 0) {
// A -> A(:,:)
for (; subscripts < symbolRank; ++subscripts) {
ref.emplace_back(Triplet{});
}
}
if (subscripts != symbolRank) {
Say("Reference to rank-%d object '%s' has %d subscripts"_err_en_US,
symbolRank, symbol.name().ToString().data(), subscripts);
} else if (subscripts == 0) {
// nothing to check
} else if (Component * component{std::get_if<Component>(&ref.base())}) {
int baseRank{component->base().Rank()};
if (baseRank > 0) {
int subscriptRank{0};
for (const auto &expr : ref.subscript()) {
subscriptRank += expr.Rank();
}
if (subscriptRank > 0) {
Say("Subscripts of component '%s' of rank-%d derived type "
"array have rank %d but must all be scalar"_err_en_US,
symbol.name().ToString().data(), baseRank, subscriptRank);
}
}
} else if (const auto *details{
symbol.detailsIf<semantics::ObjectEntityDetails>()}) {
// C928 & C1002
if (Triplet * last{std::get_if<Triplet>(&ref.subscript().back().u)}) {
if (!last->upper().has_value() && details->IsAssumedSize()) {
Say("Assumed-size array '%s' must have explicit final "
"subscript upper bound value"_err_en_US,
symbol.name().ToString().data());
}
}
}
return Designate(DataRef{std::move(ref)});
}
// Applies subscripts to a data reference.
MaybeExpr ExpressionAnalyzer::ApplySubscripts(
DataRef &&dataRef, std::vector<Subscript> &&subscripts) {
return std::visit(
common::visitors{
[&](const Symbol *symbol) {
return CompleteSubscripts(ArrayRef{*symbol, std::move(subscripts)});
},
[&](Component &&c) {
return CompleteSubscripts(
ArrayRef{std::move(c), std::move(subscripts)});
},
[&](auto &&) -> MaybeExpr {
CHECK(!"bad base for ArrayRef");
return std::nullopt;
},
},
std::move(dataRef.u));
}
// Top-level checks for data references. Unsubscripted whole array references
// get expanded -- e.g., MATRIX becomes MATRIX(:,:).
MaybeExpr ExpressionAnalyzer::TopLevelChecks(DataRef &&dataRef) {
bool addSubscripts{false};
if (Component * component{std::get_if<Component>(&dataRef.u)}) {
const Symbol &symbol{component->GetLastSymbol()};
int componentRank{symbol.Rank()};
if (componentRank > 0) {
int baseRank{component->base().Rank()};
if (baseRank > 0) {
Say("Reference to whole rank-%d component '%%%s' of "
"rank-%d array of derived type is not allowed"_err_en_US,
componentRank, symbol.name().ToString().data(), baseRank);
} else {
addSubscripts = true;
}
}
} else if (const Symbol **symbol{std::get_if<const Symbol *>(&dataRef.u)}) {
addSubscripts = (*symbol)->Rank() > 0;
}
if (addSubscripts) {
if (MaybeExpr subscripted{
ApplySubscripts(std::move(dataRef), std::vector<Subscript>{})}) {
return subscripted;
}
}
return Designate(std::move(dataRef));
}
// Parse tree correction after a substring S(j:k) was misparsed as an
// array section. N.B. Fortran substrings have to have a range, not a
// single index.
static void FixMisparsedSubstring(const parser::Designator &d) {
auto &mutate{const_cast<parser::Designator &>(d)};
if (auto *dataRef{std::get_if<parser::DataRef>(&mutate.u)}) {
if (auto *ae{std::get_if<common::Indirection<parser::ArrayElement>>(
&dataRef->u)}) {
parser::ArrayElement &arrElement{ae->value()};
if (!arrElement.subscripts.empty()) {
auto iter{arrElement.subscripts.begin()};
if (auto *triplet{std::get_if<parser::SubscriptTriplet>(&iter->u)}) {
if (!std::get<2>(triplet->t).has_value() /* no stride */ &&
++iter == arrElement.subscripts.end() /* one subscript */) {
if (Symbol *
symbol{std::visit(
common::visitors{
[](parser::Name &n) { return n.symbol; },
[](common::Indirection<parser::StructureComponent>
&sc) { return sc.value().component.symbol; },
[](auto &) -> Symbol * { return nullptr; },
},
arrElement.base.u)}) {
const Symbol &ultimate{symbol->GetUltimate()};
if (const semantics::DeclTypeSpec * type{ultimate.GetType()}) {
if (!ultimate.IsObjectArray() &&
type->category() == semantics::DeclTypeSpec::Character) {
// The ambiguous S(j:k) was parsed as an array section
// reference, but it's now clear that it's a substring.
// Fix the parse tree in situ.
mutate.u = arrElement.ConvertToSubstring();
}
}
}
}
}
}
}
}
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Designator &d) {
FixMisparsedSubstring(d);
// These checks have to be deferred to these "top level" data-refs where
// we can be sure that there are no following subscripts (yet).
if (MaybeExpr result{Analyze(d.u)}) {
if (std::optional<evaluate::DataRef> dataRef{
evaluate::ExtractDataRef(std::move(result))}) {
return TopLevelChecks(std::move(*dataRef));
}
return result;
}
return std::nullopt;
}
// A utility subroutine to repackage optional expressions of various levels
// of type specificity as fully general MaybeExpr values.
template<typename A> MaybeExpr AsMaybeExpr(A &&x) {
return std::make_optional(AsGenericExpr(std::move(x)));
}
template<typename A> MaybeExpr AsMaybeExpr(std::optional<A> &&x) {
if (x.has_value()) {
return AsMaybeExpr(std::move(*x));
}
return std::nullopt;
}
// Type kind parameter values for literal constants.
int ExpressionAnalyzer::AnalyzeKindParam(
const std::optional<parser::KindParam> &kindParam, int defaultKind,
int kanjiKind /* = -1 */) {
if (!kindParam.has_value()) {
return defaultKind;
}
return std::visit(
common::visitors{
[](std::uint64_t k) { return static_cast<int>(k); },
[&](const parser::Scalar<
parser::Integer<parser::Constant<parser::Name>>> &n) {
if (MaybeExpr ie{Analyze(n)}) {
if (std::optional<std::int64_t> i64{ToInt64(*ie)}) {
int iv = *i64;
if (iv == *i64) {
return iv;
}
}
}
return defaultKind;
},
[&](parser::KindParam::Kanji) {
if (kanjiKind >= 0) {
return kanjiKind;
}
Say("Kanji not allowed here"_err_en_US);
return defaultKind;
},
},
kindParam->u);
}
// Common handling of parser::IntLiteralConstant and SignedIntLiteralConstant
struct IntTypeVisitor {
using Result = MaybeExpr;
using Types = IntegerTypes;
template<typename T> Result Test() {
if (T::kind == kind) {
const char *p{digits.begin()};
auto value{T::Scalar::Read(p, 10, true)};
if (!value.overflow) {
return Expr<SomeType>{
Expr<SomeInteger>{Expr<T>{Constant<T>{std::move(value.value)}}}};
}
}
return std::nullopt;
}
parser::CharBlock digits;
int kind;
};
template<typename PARSED>
MaybeExpr ExpressionAnalyzer::IntLiteralConstant(const PARSED &x) {
int kind{AnalyzeKindParam(std::get<std::optional<parser::KindParam>>(x.t),
GetDefaultKind(TypeCategory::Integer))};
if (CheckIntrinsicKind(TypeCategory::Integer, kind)) {
auto digits{std::get<parser::CharBlock>(x.t)};
if (MaybeExpr result{common::SearchTypes(IntTypeVisitor{digits, kind})}) {
return result;
} else {
Say(digits, "Integer literal too large for INTEGER(KIND=%d)"_err_en_US,
kind);
}
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::IntLiteralConstant &x) {
return IntLiteralConstant(x);
}
MaybeExpr ExpressionAnalyzer::Analyze(
const parser::SignedIntLiteralConstant &x) {
return IntLiteralConstant(x);
}
template<typename TYPE>
Constant<TYPE> ReadRealLiteral(
parser::CharBlock source, FoldingContext &context) {
const char *p{source.begin()};
auto valWithFlags{Scalar<TYPE>::Read(p, context.rounding())};
CHECK(p == source.end());
RealFlagWarnings(context, valWithFlags.flags, "conversion of REAL literal");
auto value{valWithFlags.value};
if (context.flushSubnormalsToZero()) {
value = value.FlushSubnormalToZero();
}
return {value};
}
struct RealTypeVisitor {
using Result = std::optional<Expr<SomeReal>>;
using Types = RealTypes;
RealTypeVisitor(int k, parser::CharBlock lit, FoldingContext &ctx)
: kind{k}, literal{lit}, context{ctx} {}
template<typename T> Result Test() {
if (kind == T::kind) {
return {AsCategoryExpr(ReadRealLiteral<T>(literal, context))};
}
return std::nullopt;
}
int kind;
parser::CharBlock literal;
FoldingContext &context;
};
// Reads a real literal constant and encodes it with the right kind.
MaybeExpr ExpressionAnalyzer::Analyze(const parser::RealLiteralConstant &x) {
// Use a local message context around the real literal for better
// provenance on any messages.
auto save{GetContextualMessages().SetLocation(x.real.source)};
// If a kind parameter appears, it defines the kind of the literal and any
// letter used in an exponent part (e.g., the 'E' in "6.02214E+23")
// should agree. In the absence of an explicit kind parameter, any exponent
// letter determines the kind. Otherwise, defaults apply.
// TODO: warn on inexact conversions?
auto &defaults{context().defaultKinds()};
int defaultKind{defaults.GetDefaultKind(TypeCategory::Real)};
const char *end{x.real.source.end()};
std::optional<int> letterKind;
for (const char *p{x.real.source.begin()}; p < end; ++p) {
if (parser::IsLetter(*p)) {
switch (*p) {
case 'e': letterKind = defaults.GetDefaultKind(TypeCategory::Real); break;
case 'd': letterKind = defaults.doublePrecisionKind(); break;
case 'q': letterKind = defaults.quadPrecisionKind(); break;
default: Say("unknown exponent letter '%c'"_err_en_US, *p);
}
break;
}
}
if (letterKind.has_value()) {
defaultKind = *letterKind;
}
auto kind{AnalyzeKindParam(x.kind, defaultKind)};
if (letterKind.has_value() && kind != *letterKind) {
Say("explicit kind parameter on real constant disagrees with "
"exponent letter"_en_US);
}
auto result{common::SearchTypes(
RealTypeVisitor{kind, x.real.source, GetFoldingContext()})};
if (!result.has_value()) {
Say("unsupported REAL(KIND=%d)"_err_en_US, kind);
}
return AsMaybeExpr(std::move(result));
}
MaybeExpr ExpressionAnalyzer::Analyze(
const parser::SignedRealLiteralConstant &x) {
if (auto result{Analyze(std::get<parser::RealLiteralConstant>(x.t))}) {
auto &realExpr{std::get<Expr<SomeReal>>(result->u)};
if (auto sign{std::get<std::optional<parser::Sign>>(x.t)}) {
if (sign == parser::Sign::Negative) {
return {AsGenericExpr(-std::move(realExpr))};
}
}
return result;
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::ComplexPart &x) {
return Analyze(x.u);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::ComplexLiteralConstant &z) {
return AsMaybeExpr(
ConstructComplex(GetContextualMessages(), Analyze(std::get<0>(z.t)),
Analyze(std::get<1>(z.t)), GetDefaultKind(TypeCategory::Real)));
}
// CHARACTER literal processing.
MaybeExpr ExpressionAnalyzer::AnalyzeString(std::string &&string, int kind) {
if (!CheckIntrinsicKind(TypeCategory::Character, kind)) {
return std::nullopt;
}
if (kind == 1) {
return {AsGenericExpr(
Constant<Type<TypeCategory::Character, 1>>{std::move(string)})};
} else if (std::optional<std::u32string> unicode{
parser::DecodeUTF8(string)}) {
if (kind == 4) {
return {AsGenericExpr(
Constant<Type<TypeCategory::Character, 4>>{std::move(*unicode)})};
}
CHECK(kind == 2);
// TODO: better Kanji support
std::u16string result;
for (const char32_t &ch : *unicode) {
result += static_cast<char16_t>(ch);
}
return {AsGenericExpr(
Constant<Type<TypeCategory::Character, 2>>{std::move(result)})};
} else {
Say("bad UTF-8 encoding of CHARACTER(KIND=%d) literal"_err_en_US, kind);
return std::nullopt;
}
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::CharLiteralConstant &x) {
int kind{
AnalyzeKindParam(std::get<std::optional<parser::KindParam>>(x.t), 1)};
auto value{std::get<std::string>(x.t)};
return AnalyzeString(std::move(value), kind);
}
MaybeExpr ExpressionAnalyzer::Analyze(
const parser::HollerithLiteralConstant &x) {
int kind{GetDefaultKind(TypeCategory::Character)};
auto value{x.v};
return AnalyzeString(std::move(value), kind);
}
// .TRUE. and .FALSE. of various kinds
MaybeExpr ExpressionAnalyzer::Analyze(const parser::LogicalLiteralConstant &x) {
auto kind{AnalyzeKindParam(std::get<std::optional<parser::KindParam>>(x.t),
GetDefaultKind(TypeCategory::Logical))};
bool value{std::get<bool>(x.t)};
auto result{common::SearchTypes(
TypeKindVisitor<TypeCategory::Logical, Constant, bool>{
kind, std::move(value)})};
if (!result.has_value()) {
Say("unsupported LOGICAL(KIND=%d)"_err_en_US, kind);
}
return result;
}
// BOZ typeless literals
MaybeExpr ExpressionAnalyzer::Analyze(const parser::BOZLiteralConstant &x) {
const char *p{x.v.data()};
std::uint64_t base{16};
switch (*p++) {
case 'b': base = 2; break;
case 'o': base = 8; break;
case 'z': break;
case 'x': break;
default: CRASH_NO_CASE;
}
CHECK(*p == '"');
++p;
auto value{BOZLiteralConstant::Read(p, base, false /*unsigned*/)};
if (*p != '"') {
Say("invalid digit ('%c') in BOZ literal %s"_err_en_US, *p, x.v.data());
return std::nullopt;
}
if (value.overflow) {
Say("BOZ literal %s too large"_err_en_US, x.v.data());
return std::nullopt;
}
return {AsGenericExpr(std::move(value.value))};
}
// For use with SearchTypes to create a TypeParamInquiry with the
// right integer kind.
struct TypeParamInquiryVisitor {
using Result = std::optional<Expr<SomeInteger>>;
using Types = IntegerTypes;
TypeParamInquiryVisitor(int k, SymbolOrComponent &&b, const Symbol &param)
: kind{k}, base{std::move(b)}, parameter{param} {}
template<typename T> Result Test() {
if (kind == T::kind) {
return Expr<SomeInteger>{
Expr<T>{TypeParamInquiry<T::kind>{std::move(base), parameter}}};
}
return std::nullopt;
}
int kind;
SymbolOrComponent base;
const Symbol &parameter;
};
static std::optional<Expr<SomeInteger>> MakeTypeParamInquiry(
const Symbol *symbol) {
if (std::optional<DynamicType> dyType{GetSymbolType(symbol)}) {
if (dyType->category == TypeCategory::Integer) {
return common::SearchTypes(TypeParamInquiryVisitor{
dyType->kind, SymbolOrComponent{nullptr}, *symbol});
}
}
return std::nullopt;
}
// Names and named constants
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Name &n) {
if (std::optional<int> kind{IsAcImpliedDo(n.source)}) {
return AsMaybeExpr(ConvertToKind<TypeCategory::Integer>(
*kind, AsExpr(ImpliedDoIndex{n.source})));
} else if (n.symbol != nullptr) {
const Symbol &ultimate{n.symbol->GetUltimate()};
if (ultimate.attrs().test(semantics::Attr::PARAMETER)) {
if (auto *details{ultimate.detailsIf<semantics::ObjectEntityDetails>()}) {
if (auto &init{details->init()}) {
return init;
}
}
// TODO: enumerators, do they have the PARAMETER attribute?
} else if (ultimate.detailsIf<semantics::TypeParamDetails>()) {
// A bare reference to a derived type parameter (within a parameterized
// derived type definition)
return AsMaybeExpr(MakeTypeParamInquiry(&ultimate));
} else if (MaybeExpr result{Designate(DataRef{*n.symbol})}) {
return result;
} else {
Say(n.source, "not of a supported type and kind"_err_en_US);
}
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::NamedConstant &n) {
if (MaybeExpr value{Analyze(n.v)}) {
Expr<SomeType> folded{Fold(GetFoldingContext(), std::move(*value))};
if (IsConstantExpr(folded)) {
return {folded};
}
Say(n.v.source, "must be a constant"_err_en_US);
}
return std::nullopt;
}
// Substring references
std::optional<Expr<SubscriptInteger>> ExpressionAnalyzer::GetSubstringBound(
const std::optional<parser::ScalarIntExpr> &bound) {
if (bound.has_value()) {
if (MaybeExpr expr{Analyze(*bound)}) {
if (expr->Rank() > 1) {
Say("substring bound expression has rank %d"_err_en_US, expr->Rank());
}
if (auto *intExpr{std::get_if<Expr<SomeInteger>>(&expr->u)}) {
if (auto *ssIntExpr{std::get_if<Expr<SubscriptInteger>>(&intExpr->u)}) {
return {std::move(*ssIntExpr)};
}
return {Expr<SubscriptInteger>{
Convert<SubscriptInteger, TypeCategory::Integer>{
std::move(*intExpr)}}};
} else {
Say("substring bound expression is not INTEGER"_err_en_US);
}
}
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Substring &ss) {
if (MaybeExpr baseExpr{Analyze(std::get<parser::DataRef>(ss.t))}) {
if (std::optional<DataRef> dataRef{ExtractDataRef(std::move(*baseExpr))}) {
if (MaybeExpr newBaseExpr{TopLevelChecks(std::move(*dataRef))}) {
if (std::optional<DataRef> checked{
ExtractDataRef(std::move(*newBaseExpr))}) {
const parser::SubstringRange &range{
std::get<parser::SubstringRange>(ss.t)};
std::optional<Expr<SubscriptInteger>> first{
GetSubstringBound(std::get<0>(range.t))};
std::optional<Expr<SubscriptInteger>> last{
GetSubstringBound(std::get<1>(range.t))};
const Symbol &symbol{checked->GetLastSymbol()};
if (std::optional<DynamicType> dynamicType{GetSymbolType(symbol)}) {
if (dynamicType->category == TypeCategory::Character) {
return WrapperHelper<TypeCategory::Character, Designator,
Substring>(dynamicType->kind,
Substring{std::move(checked.value()), std::move(first),
std::move(last)});
}
}
Say("substring may apply only to CHARACTER"_err_en_US);
}
}
}
}
return std::nullopt;
}
// CHARACTER literal substrings
MaybeExpr ExpressionAnalyzer::Analyze(
const parser::CharLiteralConstantSubstring &x) {
const parser::SubstringRange &range{std::get<parser::SubstringRange>(x.t)};
std::optional<Expr<SubscriptInteger>> lower{
GetSubstringBound(std::get<0>(range.t))};
std::optional<Expr<SubscriptInteger>> upper{
GetSubstringBound(std::get<1>(range.t))};
if (MaybeExpr string{Analyze(std::get<parser::CharLiteralConstant>(x.t))}) {
if (auto *charExpr{std::get_if<Expr<SomeCharacter>>(&string->u)}) {
Expr<SubscriptInteger> length{std::visit(
[](const auto &ckExpr) { return ckExpr.LEN(); }, charExpr->u)};
if (!lower.has_value()) {
lower = Expr<SubscriptInteger>{1};
}
if (!upper.has_value()) {
upper = Expr<SubscriptInteger>{
static_cast<std::int64_t>(ToInt64(length).value())};
}
return std::visit(
[&](auto &&ckExpr) -> MaybeExpr {
using Result = ResultType<decltype(ckExpr)>;
auto *cp{std::get_if<Constant<Result>>(&ckExpr.u)};
CHECK(cp != nullptr); // the parent was parsed as a constant string
CHECK(cp->size() == 1);
StaticDataObject::Pointer staticData{StaticDataObject::Create()};
staticData->set_alignment(Result::kind)
.set_itemBytes(Result::kind)
.Push(**cp);
Substring substring{std::move(staticData), std::move(lower.value()),
std::move(upper.value())};
return AsGenericExpr(Expr<SomeCharacter>{
Expr<Result>{Designator<Result>{std::move(substring)}}});
},
std::move(charExpr->u));
}
}
return std::nullopt;
}
// Subscripted array references
std::optional<Expr<SubscriptInteger>> ExpressionAnalyzer::AsSubscript(
MaybeExpr &&expr) {
if (expr.has_value()) {
if (expr->Rank() > 1) {
Say("subscript expression has rank %d"_err_en_US, expr->Rank());
}
if (auto *intExpr{std::get_if<Expr<SomeInteger>>(&expr->u)}) {
if (auto *ssIntExpr{std::get_if<Expr<SubscriptInteger>>(&intExpr->u)}) {
return {std::move(*ssIntExpr)};
}
return {Expr<SubscriptInteger>{
Convert<SubscriptInteger, TypeCategory::Integer>{
std::move(*intExpr)}}};
} else {
Say("subscript expression is not INTEGER"_err_en_US);
}
}
return std::nullopt;
}
std::optional<Expr<SubscriptInteger>> ExpressionAnalyzer::TripletPart(
const std::optional<parser::Subscript> &s) {
if (s.has_value()) {
return AsSubscript(Analyze(*s));
}
return std::nullopt;
}
std::optional<Subscript> ExpressionAnalyzer::AnalyzeSectionSubscript(
const parser::SectionSubscript &ss) {
return std::visit(
common::visitors{
[&](const parser::SubscriptTriplet &t) {
return std::make_optional(Subscript{Triplet{
TripletPart(std::get<0>(t.t)), TripletPart(std::get<1>(t.t)),
TripletPart(std::get<2>(t.t))}});
},
[&](const auto &s) -> std::optional<Subscript> {
if (auto subscriptExpr{AsSubscript(Analyze(s))}) {
return {Subscript{std::move(*subscriptExpr)}};
} else {
return std::nullopt;
}
},
},
ss.u);
}
std::vector<Subscript> ExpressionAnalyzer::AnalyzeSectionSubscripts(
const std::list<parser::SectionSubscript> &sss) {
std::vector<Subscript> subscripts;
for (const auto &s : sss) {
if (auto subscript{AnalyzeSectionSubscript(s)}) {
subscripts.emplace_back(std::move(*subscript));
}
}
return subscripts;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::ArrayElement &ae) {
std::vector<Subscript> subscripts{AnalyzeSectionSubscripts(ae.subscripts)};
if (MaybeExpr baseExpr{Analyze(ae.base)}) {
if (std::optional<DataRef> dataRef{ExtractDataRef(std::move(*baseExpr))}) {
if (MaybeExpr result{
ApplySubscripts(std::move(*dataRef), std::move(subscripts))}) {
return result;
}
}
}
Say("subscripts may be applied only to an object or component"_err_en_US);
return std::nullopt;
}
// Type parameter inquiries apply to data references, but don't depend
// on any trailing (co)subscripts.
static SymbolOrComponent IgnoreAnySubscripts(
Designator<SomeDerived> &&designator) {
return std::visit(
common::visitors{
[](const Symbol *symbol) { return SymbolOrComponent{symbol}; },
[](Component &&component) { return SymbolOrComponent{component}; },
[](ArrayRef &&arrayRef) { return std::move(arrayRef.base()); },
[](CoarrayRef &&coarrayRef) {
return SymbolOrComponent{&coarrayRef.GetLastSymbol()};
},
},
std::move(designator.u));
}
// Components of parent derived types are explicitly represented as such.
static std::optional<Component> CreateComponent(
DataRef &&base, const Symbol &component, const semantics::Scope &scope) {
if (&component.owner() == &scope) {
return {Component{std::move(base), component}};
}
if (const semantics::Scope * parentScope{scope.GetDerivedTypeParent()}) {
if (const Symbol * parentComponent{parentScope->GetSymbol()}) {
return CreateComponent(
DataRef{Component{std::move(base), *parentComponent}}, component,
*parentScope);
}
}
return std::nullopt;
}
// Derived type component references and type parameter inquiries
MaybeExpr ExpressionAnalyzer::Analyze(const parser::StructureComponent &sc) {
const auto &name{sc.component.source};
if (MaybeExpr base{Analyze(sc.base)}) {
Symbol *sym{sc.component.symbol};
if (sym == nullptr) {
Say(sc.component.source,
"component name was not resolved to a symbol"_err_en_US);
} else if (auto *dtExpr{UnwrapExpr<Expr<SomeDerived>>(*base)}) {
const semantics::DerivedTypeSpec *dtSpec{nullptr};
if (std::optional<DynamicType> dtDyTy{dtExpr->GetType()}) {
dtSpec = dtDyTy->derived;
}
if (sym->detailsIf<semantics::TypeParamDetails>()) {
if (auto *designator{UnwrapExpr<Designator<SomeDerived>>(*dtExpr)}) {
if (std::optional<DynamicType> dyType{GetSymbolType(*sym)}) {
if (dyType->category == TypeCategory::Integer) {
return AsMaybeExpr(
common::SearchTypes(TypeParamInquiryVisitor{dyType->kind,
IgnoreAnySubscripts(std::move(*designator)), *sym}));
}
}
Say(name, "type parameter is not INTEGER"_err_en_US);
} else {
Say(name,
"type parameter inquiry must be applied to "
"a designator"_err_en_US);
}
} else if (dtSpec == nullptr || dtSpec->scope() == nullptr) {
Say(name,
"TODO: base of component reference lacks a derived type"_err_en_US);
} else if (std::optional<DataRef> dataRef{
ExtractDataRef(std::move(*dtExpr))}) {
if (auto component{
CreateComponent(std::move(*dataRef), *sym, *dtSpec->scope())}) {
return Designate(DataRef{std::move(*component)});
} else {
Say(name, "component is not in scope of derived TYPE(%s)"_err_en_US,
dtSpec->typeSymbol().name().ToString().data());
}
} else {
Say(name,
"base of component reference must be a data reference"_err_en_US);
}
} else if (auto *details{sym->detailsIf<semantics::MiscDetails>()}) {
// special part-ref: %re, %im, %kind, %len
// Type errors are detected and reported in semantics.
using MiscKind = semantics::MiscDetails::Kind;
MiscKind kind{details->kind()};
if (kind == MiscKind::ComplexPartRe || kind == MiscKind::ComplexPartIm) {
if (auto *zExpr{std::get_if<Expr<SomeComplex>>(&base->u)}) {
if (std::optional<DataRef> dataRef{
ExtractDataRef(std::move(*zExpr))}) {
Expr<SomeReal> realExpr{std::visit(
[&](const auto &z) {
using PartType = typename ResultType<decltype(z)>::Part;
auto part{kind == MiscKind::ComplexPartRe
? ComplexPart::Part::RE
: ComplexPart::Part::IM};
return AsCategoryExpr(Designator<PartType>{
ComplexPart{std::move(*dataRef), part}});
},
zExpr->u)};
return {AsGenericExpr(std::move(realExpr))};
}
}
} else if (kind == MiscKind::KindParamInquiry ||
kind == MiscKind::LenParamInquiry) {
// Convert x%KIND -> intrinsic KIND(x), x%LEN -> intrinsic LEN(x)
SpecificIntrinsic func{name.ToString()};
func.type = GetDefaultKindOfType(TypeCategory::Integer);
return TypedWrapper<FunctionRef, ProcedureRef>(*func.type,
ProcedureRef{ProcedureDesignator{std::move(func)},
ActualArguments{ActualArgument{std::move(*base)}}});
} else {
common::die("unexpected kind");
}
} else {
Say(name, "derived type required before component reference"_err_en_US);
}
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::CoindexedNamedObject &co) {
Say("TODO: CoindexedNamedObject unimplemented"_err_en_US);
return std::nullopt;
}
int ExpressionAnalyzer::IntegerTypeSpecKind(
const parser::IntegerTypeSpec &spec) {
Expr<SubscriptInteger> value{
AnalyzeKindSelector(TypeCategory::Integer, spec.v)};
if (auto kind{ToInt64(value)}) {
return static_cast<int>(*kind);
}
SayAt(spec, "Constant INTEGER kind value required here"_err_en_US);
return GetDefaultKind(TypeCategory::Integer);
}
// Array constructors
class ArrayConstructorContext : private ExpressionAnalyzer {
public:
ArrayConstructorContext(
ExpressionAnalyzer &c, std::optional<DynamicTypeWithLength> &t)
: ExpressionAnalyzer{c}, type_{t} {}
ArrayConstructorContext(ArrayConstructorContext &) = default;
void Push(MaybeExpr &&);
void Add(const parser::AcValue &);
std::optional<DynamicTypeWithLength> &type() const { return type_; }
const ArrayConstructorValues<SomeType> &values() { return values_; }
private:
template<int KIND, typename A>
std::optional<Expr<Type<TypeCategory::Integer, KIND>>> GetSpecificIntExpr(
const A &x) {
if (MaybeExpr y{Analyze(x)}) {
Expr<SomeInteger> *intExpr{UnwrapExpr<Expr<SomeInteger>>(*y)};
CHECK(intExpr != nullptr);
return ConvertToType<Type<TypeCategory::Integer, KIND>>(
std::move(*intExpr));
}
return std::nullopt;
}
std::optional<DynamicTypeWithLength> &type_;
bool explicitType_{type_.has_value()};
std::optional<std::int64_t> constantLength_;
ArrayConstructorValues<SomeType> values_;
};
void ArrayConstructorContext::Push(MaybeExpr &&x) {
if (x.has_value()) {
DynamicTypeWithLength xType;
if (auto dyType{x->GetType()}) {
*static_cast<DynamicType *>(&xType) = *dyType;
}
if (Expr<SomeCharacter> * charExpr{UnwrapExpr<Expr<SomeCharacter>>(*x)}) {
CHECK(xType.category == TypeCategory::Character);
xType.length =
std::visit([](const auto &kc) { return kc.LEN(); }, charExpr->u);
}
if (!type_.has_value()) {
// If there is no explicit type-spec in an array constructor, the type
// of the array is the declared type of all of the elements, which must
// be well-defined and all match.
// TODO: Possible language extension: use the most general type of
// the values as the type of a numeric constructed array, convert all
// of the other values to that type. Alternative: let the first value
// determine the type, and convert the others to that type.
// TODO pmk: better type compatibility checks for derived types
CHECK(!explicitType_);
type_ = std::move(xType);
constantLength_ = ToInt64(type_->length);
values_.Push(std::move(*x));
} else if (!explicitType_) {
if (static_cast<const DynamicType &>(*type_) ==
static_cast<const DynamicType &>(xType)) {
values_.Push(std::move(*x));
if (auto thisLen{ToInt64(xType.LEN())}) {
if (constantLength_.has_value()) {
if (context().warnOnNonstandardUsage() &&
*thisLen != *constantLength_) {
Say("Character literal in array constructor without explicit "
"type has different length than earlier element"_en_US);
}
if (*thisLen > *constantLength_) {
// Language extension: use the longest literal to determine the
// length of the array constructor's character elements, not the
// first, when there is no explicit type.
*constantLength_ = *thisLen;
type_->length = xType.LEN();
}
} else {
constantLength_ = *thisLen;
type_->length = xType.LEN();
}
}
} else {
Say("Values in array constructor must have the same declared type "
"when no explicit type appears"_err_en_US);
}
} else {
if (auto cast{ConvertToType(*type_, std::move(*x))}) {
values_.Push(std::move(*cast));
} else {
Say("Value in array constructor could not be converted to the type "
"of the array"_err_en_US);
}
}
}
}
void ArrayConstructorContext::Add(const parser::AcValue &x) {
using IntType = ResultType<ImpliedDoIndex>;
std::visit(
common::visitors{
[&](const parser::AcValue::Triplet &triplet) {
// Transform l:u(:s) into (_,_=l,u(,s)) with an anonymous index '_'
std::optional<Expr<IntType>> lower{
GetSpecificIntExpr<IntType::kind>(std::get<0>(triplet.t))};
std::optional<Expr<IntType>> upper{
GetSpecificIntExpr<IntType::kind>(std::get<1>(triplet.t))};
std::optional<Expr<IntType>> stride{
GetSpecificIntExpr<IntType::kind>(std::get<2>(triplet.t))};
if (lower.has_value() && upper.has_value()) {
if (!stride.has_value()) {
stride = Expr<IntType>{1};
}
if (!type_.has_value()) {
type_ = DynamicTypeWithLength{IntType::GetType()};
}
ArrayConstructorContext nested{*this};
parser::CharBlock name;
nested.Push(Expr<SomeType>{
Expr<SomeInteger>{Expr<IntType>{ImpliedDoIndex{name}}}});
values_.Push(ImpliedDo<SomeType>{name, std::move(*lower),
std::move(*upper), std::move(*stride),
std::move(nested.values_)});
}
},
[&](const common::Indirection<parser::Expr> &expr) {
auto restorer{
GetContextualMessages().SetLocation(expr.value().source)};
if (MaybeExpr v{Analyze(expr.value())}) {
Push(std::move(*v));
}
},
[&](const common::Indirection<parser::AcImpliedDo> &impliedDo) {
const auto &control{
std::get<parser::AcImpliedDoControl>(impliedDo.value().t)};
const auto &bounds{
std::get<parser::LoopBounds<parser::ScalarIntExpr>>(control.t)};
parser::CharBlock name{bounds.name.thing.thing.source};
int kind{IntType::kind};
if (auto &its{std::get<std::optional<parser::IntegerTypeSpec>>(
control.t)}) {
kind = IntegerTypeSpecKind(*its);
}
bool inserted{AddAcImpliedDo(name, kind)};
if (!inserted) {
SayAt(name,
"Implied DO index is active in surrounding implied DO loop "
"and cannot have the same name"_err_en_US);
}
std::optional<Expr<IntType>> lower{
GetSpecificIntExpr<IntType::kind>(bounds.lower)};
std::optional<Expr<IntType>> upper{
GetSpecificIntExpr<IntType::kind>(bounds.upper)};
std::optional<Expr<IntType>> stride{
GetSpecificIntExpr<IntType::kind>(bounds.step)};
ArrayConstructorContext nested{*this};
for (const auto &value :
std::get<std::list<parser::AcValue>>(impliedDo.value().t)) {
nested.Add(value);
}
if (lower.has_value() && upper.has_value()) {
if (!stride.has_value()) {
stride = Expr<IntType>{1};
}
values_.Push(ImpliedDo<SomeType>{name, std::move(*lower),
std::move(*upper), std::move(*stride),
std::move(nested.values_)});
}
if (inserted) {
RemoveAcImpliedDo(name);
}
},
},
x.u);
}
// Inverts a collection of generic ArrayConstructorValues<SomeType> that
// all happen to have the same actual type T into one ArrayConstructor<T>.
template<typename T>
ArrayConstructorValues<T> MakeSpecific(
ArrayConstructorValues<SomeType> &&from) {
ArrayConstructorValues<T> to;
for (ArrayConstructorValue<SomeType> &x : from.values()) {
std::visit(
common::visitors{
[&](common::CopyableIndirection<Expr<SomeType>> &&expr) {
auto *typed{UnwrapExpr<Expr<T>>(expr.value())};
CHECK(typed != nullptr);
to.Push(std::move(*typed));
},
[&](ImpliedDo<SomeType> &&impliedDo) {
to.Push(ImpliedDo<T>{impliedDo.name(),
std::move(impliedDo.lower()), std::move(impliedDo.upper()),
std::move(impliedDo.stride()),
MakeSpecific<T>(std::move(impliedDo.values()))});
},
},
std::move(x.u));
}
return to;
}
struct ArrayConstructorTypeVisitor {
using Result = MaybeExpr;
using Types = AllTypes;
template<typename T> Result Test() {
if (type.category == T::category) {
if constexpr (T::category == TypeCategory::Derived) {
CHECK(type.derived != nullptr);
return AsMaybeExpr(ArrayConstructor<T>{
*type.derived, MakeSpecific<T>(std::move(values))});
} else if (type.kind == T::kind) {
if constexpr (T::category == TypeCategory::Character) {
return AsMaybeExpr(ArrayConstructor<T>{
type.LEN().value(), MakeSpecific<T>(std::move(values))});
} else {
return AsMaybeExpr(
ArrayConstructor<T>{MakeSpecific<T>(std::move(values))});
}
}
}
return std::nullopt;
}
DynamicTypeWithLength type;
ArrayConstructorValues<SomeType> values;
};
MaybeExpr ExpressionAnalyzer::Analyze(const parser::ArrayConstructor &array) {
const parser::AcSpec &acSpec{array.v};
std::optional<DynamicTypeWithLength> type{AnalyzeTypeSpec(acSpec.type)};
ArrayConstructorContext context{*this, type};
for (const parser::AcValue &value : acSpec.values) {
context.Add(value);
}
if (type.has_value()) {
ArrayConstructorTypeVisitor visitor{
std::move(*type), std::move(context.values())};
return common::SearchTypes(std::move(visitor));
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(
const parser::StructureConstructor &structure) {
auto &parsedType{std::get<parser::DerivedTypeSpec>(structure.t)};
parser::CharBlock typeName{std::get<parser::Name>(parsedType.t).source};
if (parsedType.derivedTypeSpec == nullptr) {
Say("INTERNAL: parser::StructureConstructor lacks type"_err_en_US);
return std::nullopt;
}
const auto &spec{*parsedType.derivedTypeSpec};
CHECK(spec.scope() != nullptr);
const Symbol &typeSymbol{spec.typeSymbol()};
if (typeSymbol.attrs().test(semantics::Attr::ABSTRACT)) { // C796
if (auto *msg{Say(typeName,
"ABSTRACT derived type '%s' cannot be used in a "
"structure constructor"_err_en_US,
typeName.ToString().data())}) {
msg->Attach(
typeSymbol.name(), "Declaration of ABSTRACT derived type"_en_US);
}
}
// This list holds all of the components in the derived type and its
// parents. The symbols for whole parent components appear after their
// own components and before the components of the types that extend them.
// E.g., TYPE :: A; REAL X; END TYPE
// TYPE, EXTENDS(A) :: B; REAL Y; END TYPE
// produces the component list X, A, Y.
// The order is important below because a structure constructor can
// initialize X or A by name, but not both.
const auto &details{typeSymbol.get<semantics::DerivedTypeDetails>()};
std::list<const Symbol *> components{details.OrderComponents(*spec.scope())};
auto nextAnonymous{components.begin()};
std::set<parser::CharBlock> unavailable;
bool anyKeyword{false};
StructureConstructor result{spec};
bool checkConflicts{true};
for (const auto &component :
std::get<std::list<parser::ComponentSpec>>(structure.t)) {
const parser::Expr &expr{
std::get<parser::ComponentDataSource>(component.t).v.value()};
parser::CharBlock source{expr.source};
const Symbol *symbol{nullptr};
if (const auto &kw{std::get<std::optional<parser::Keyword>>(component.t)}) {
source = kw->v.source;
symbol = kw->v.symbol;
anyKeyword = true;
} else {
if (anyKeyword) { // C7100
Say(source,
"Value in structure constructor lacks a component name"_err_en_US);
checkConflicts = false; // stem cascade
}
while (nextAnonymous != components.end()) {
symbol = *nextAnonymous++;
if (!symbol->test(Symbol::Flag::ParentComp)) {
break;
}
}
if (symbol == nullptr) {
Say(source, "Unexpected value in structure constructor"_err_en_US);
}
}
if (symbol != nullptr) {
if (symbol->has<semantics::TypeParamDetails>()) {
Say(source,
"Type parameter '%s' cannot be a component of this structure "
"constructor"_err_en_US,
symbol->name().ToString().data());
continue;
}
if (checkConflicts) {
auto componentIter{
std::find(components.begin(), components.end(), symbol)};
if (unavailable.find(symbol->name()) != unavailable.cend()) {
// C797, C798
Say(source,
"Component '%s' conflicts with another component earlier in "
"this structure constructor"_err_en_US,
symbol->name().ToString().data());
} else if (symbol->test(Symbol::Flag::ParentComp)) {
// Make earlier components unavailable once a whole parent appears.
for (auto it{components.begin()}; it != componentIter; ++it) {
unavailable.insert((*it)->name());
}
} else {
// Make whole parent components unavailable after any of their
// constituents appear.
for (auto it{componentIter}; it != components.end(); ++it) {
if ((*it)->test(Symbol::Flag::ParentComp)) {
unavailable.insert((*it)->name());
}
}
}
}
unavailable.insert(symbol->name());
if (MaybeExpr value{Analyze(expr)}) {
bool isNULL{std::holds_alternative<NullPointer>(value->u)};
if (symbol->has<semantics::ProcEntityDetails>()) {
CHECK(symbol->attrs().test(semantics::Attr::POINTER));
if (!isNULL) {
// TODO C7104: check that procedure pointer components are
// being initialized with compatible procedure designators
Say(expr.source,
"TODO: non-null procedure pointer component value not implemented yet"_err_en_US);
}
} else {
CHECK(symbol->has<semantics::ObjectEntityDetails>());
// C1594(4)
if (!isNULL) {
const auto &innermost{context().FindScope(expr.source)};
if (const auto *pureFunc{
semantics::FindPureFunctionContaining(&innermost)}) {
if (const Symbol *
pointer{semantics::FindPointerComponent(*symbol)}) {
if (const Symbol *
object{semantics::FindExternallyVisibleObject(
*value, *pureFunc)}) {
if (auto *msg{Say(expr.source,
"Externally visible object '%s' must not be "
"associated with pointer component '%s' in a "
"PURE function"_err_en_US,
object->name().ToString().data(),
pointer->name().ToString().data())}) {
msg->Attach(object->name(), "Object declaration"_en_US)
.Attach(pointer->name(), "Pointer declaration"_en_US);
}
}
}
}
}
if (symbol->attrs().test(semantics::Attr::POINTER)) {
if (!isNULL) {
// TODO C7104: check that object pointer components are
// being initialized with compatible object designators
}
} else if (MaybeExpr converted{
ConvertToType(*symbol, std::move(*value))}) {
result.Add(*symbol, std::move(*converted));
} else {
if (auto *msg{Say(expr.source,
"Structure constructor value is incompatible with component '%s'"_err_en_US,
symbol->name().ToString().data())}) {
msg->Attach(symbol->name(), "Component declaration"_en_US);
}
}
}
}
}
}
// Ensure that unmentioned component objects have default initializers.
for (const Symbol *symbol : components) {
if (!symbol->test(Symbol::Flag::ParentComp) &&
unavailable.find(symbol->name()) == unavailable.cend() &&
!symbol->attrs().test(semantics::Attr::ALLOCATABLE)) {
if (const auto *details{
symbol->detailsIf<semantics::ObjectEntityDetails>()}) {
if (details->init().has_value()) {
result.Add(*symbol, common::Clone(*details->init()));
} else { // C799
if (auto *msg{Say(typeName,
"Structure constructor lacks a value for "
"component '%s'"_err_en_US,
symbol->name().ToString().data())}) {
msg->Attach(symbol->name(), "Absent component"_en_US);
}
}
}
}
}
return AsMaybeExpr(Expr<SomeDerived>{std::move(result)});
}
auto ExpressionAnalyzer::Procedure(const parser::ProcedureDesignator &pd,
ActualArguments &arguments) -> std::optional<CallAndArguments> {
return std::visit(
common::visitors{
[&](const parser::Name &n) -> std::optional<CallAndArguments> {
if (n.symbol == nullptr) {
Say("TODO INTERNAL no symbol for procedure designator name '%s'"_err_en_US,
n.ToString().data());
return std::nullopt;
}
const Symbol &ultimate{n.symbol->GetUltimate()};
if (const auto *proc{
ultimate.detailsIf<semantics::ProcEntityDetails>()}) {
if (proc->HasExplicitInterface()) {
// TODO: check actual arguments vs. interface
} else {
CallCharacteristics cc{n.source};
if (std::optional<SpecificCall> specificCall{
context().intrinsics().Probe(
cc, arguments, &GetContextualMessages())}) {
return {
CallAndArguments{ProcedureDesignator{std::move(
specificCall->specificIntrinsic)},
std::move(specificCall->arguments)}};
} else {
// TODO: if name is not INTRINSIC, call with implicit
// interface
}
}
return {CallAndArguments{
ProcedureDesignator{*n.symbol}, std::move(arguments)}};
} else {
Say(n.source, "not a procedure"_err_en_US);
return std::nullopt;
}
},
[&](const parser::ProcComponentRef &pcr)
-> std::optional<CallAndArguments> {
if (MaybeExpr component{Analyze(pcr.v)}) {
// TODO distinguish PCR from TBP
// TODO optional PASS argument for TBP
return std::nullopt;
} else {
return std::nullopt;
}
},
},
pd.u);
}
MaybeExpr ExpressionAnalyzer::Analyze(
const parser::FunctionReference &funcRef) {
// TODO: C1002: Allow a whole assumed-size array to appear if the dummy
// argument would accept it. Handle by special-casing the context
// ActualArg -> Variable -> Designator.
// TODO: Actual arguments that are procedures and procedure pointers need to
// be detected and represented (they're not expressions).
// TODO: C1534: Don't allow a "restricted" specific intrinsic to be passed.
ActualArguments arguments;
for (const auto &arg :
std::get<std::list<parser::ActualArgSpec>>(funcRef.v.t)) {
MaybeExpr actualArgExpr;
std::visit(
common::visitors{
[&](const common::Indirection<parser::Variable> &v) {
actualArgExpr = Analyze(v.value());
},
[&](const common::Indirection<parser::Expr> &x) {
actualArgExpr = Analyze(x.value());
},
[&](const parser::Name &n) {
Say("TODO: procedure name actual arg"_err_en_US);
},
[&](const parser::ProcComponentRef &) {
Say("TODO: proc component ref actual arg"_err_en_US);
},
[&](const parser::AltReturnSpec &) {
Say("alternate return specification cannot appear on function reference"_err_en_US);
},
[&](const parser::ActualArg::PercentRef &) {
Say("TODO: %REF() argument"_err_en_US);
},
[&](const parser::ActualArg::PercentVal &) {
Say("TODO: %VAL() argument"_err_en_US);
},
},
std::get<parser::ActualArg>(arg.t).u);
if (actualArgExpr.has_value()) {
arguments.emplace_back(std::make_optional(
Fold(GetFoldingContext(), std::move(*actualArgExpr))));
if (const auto &argKW{std::get<std::optional<parser::Keyword>>(arg.t)}) {
arguments.back()->keyword = argKW->v.source;
}
} else {
return std::nullopt;
}
}
// TODO: map user generic to specific procedure
if (std::optional<CallAndArguments> proc{Procedure(
std::get<parser::ProcedureDesignator>(funcRef.v.t), arguments)}) {
if (std::optional<DynamicType> dyType{
proc->procedureDesignator.GetType()}) {
return TypedWrapper<FunctionRef, ProcedureRef>(*dyType,
ProcedureRef{std::move(proc->procedureDesignator),
std::move(proc->arguments)});
} else {
if (const auto *intrinsic{
std::get_if<SpecificIntrinsic>(&proc->procedureDesignator.u)}) {
if (intrinsic->name == "null"s && proc->arguments.empty()) {
return {Expr<SomeType>{NullPointer{}}};
}
}
}
}
return std::nullopt;
}
// Unary operations
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::Parentheses &x) {
// TODO: C1003: A parenthesized function reference may not return a
// procedure pointer.
if (MaybeExpr operand{Analyze(x.v.value())}) {
return std::visit(
common::visitors{
[&](BOZLiteralConstant &&boz) {
return operand; // ignore parentheses around typeless constants
},
[&](NullPointer &&boz) {
return operand; // ignore parentheses around NULL()
},
[&](Expr<SomeDerived> &&) {
// TODO: parenthesized derived type variable
return operand;
},
[](auto &&catExpr) {
return std::visit(
[](auto &&expr) -> MaybeExpr {
using Ty = ResultType<decltype(expr)>;
return {AsGenericExpr(Parentheses<Ty>{std::move(expr)})};
},
std::move(catExpr.u));
},
},
std::move(operand->u));
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::UnaryPlus &x) {
MaybeExpr value{Analyze(x.v.value())};
if (value.has_value()) {
std::visit(
common::visitors{
[](const BOZLiteralConstant &) {}, // allow +Z'1', it's harmless
[&](const NullPointer &) {
Say("+NULL() is not allowed"_err_en_US);
},
[&](const auto &catExpr) {
TypeCategory cat{ResultType<decltype(catExpr)>::category};
if (cat != TypeCategory::Integer && cat != TypeCategory::Real &&
cat != TypeCategory::Complex) {
Say("operand of unary + must be of a numeric type"_err_en_US);
}
},
},
value->u);
}
return value;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::Negate &x) {
if (MaybeExpr operand{Analyze(x.v.value())}) {
return Negation(GetContextualMessages(), std::move(*operand));
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::NOT &x) {
if (MaybeExpr operand{Analyze(x.v.value())}) {
return std::visit(
common::visitors{
[](Expr<SomeLogical> &&lx) -> MaybeExpr {
return {AsGenericExpr(LogicalNegation(std::move(lx)))};
},
[&](auto &&) -> MaybeExpr {
// TODO: accept INTEGER operand and maybe typeless
// if not overridden
Say("Operand of .NOT. must be LOGICAL"_err_en_US);
return std::nullopt;
},
},
std::move(operand->u));
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::PercentLoc &) {
Say("TODO: %LOC unimplemented"_err_en_US);
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::DefinedUnary &) {
Say("TODO: DefinedUnary unimplemented"_err_en_US);
return std::nullopt;
}
// Binary (dyadic) operations
// TODO: check defined operators for illegal intrinsic operator cases
template<template<typename> class OPR, typename PARSED>
MaybeExpr BinaryOperationHelper(ExpressionAnalyzer &context, const PARSED &x) {
if (auto both{common::AllPresent(context.Analyze(std::get<0>(x.t).value()),
context.Analyze(std::get<1>(x.t).value()))}) {
ConformabilityCheck(context.GetContextualMessages(), std::get<0>(*both),
std::get<1>(*both));
return NumericOperation<OPR>(context.GetContextualMessages(),
std::move(std::get<0>(*both)), std::move(std::get<1>(*both)),
context.GetDefaultKind(TypeCategory::Real));
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::Power &x) {
return BinaryOperationHelper<Power>(*this, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::Multiply &x) {
return BinaryOperationHelper<Multiply>(*this, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::Divide &x) {
return BinaryOperationHelper<Divide>(*this, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::Add &x) {
return BinaryOperationHelper<Add>(*this, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::Subtract &x) {
return BinaryOperationHelper<Subtract>(*this, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(
const parser::Expr::ComplexConstructor &x) {
auto re{Analyze(std::get<0>(x.t).value())};
auto im{Analyze(std::get<1>(x.t).value())};
if (re.has_value() && im.has_value()) {
ConformabilityCheck(GetContextualMessages(), *re, *im);
}
return AsMaybeExpr(ConstructComplex(GetContextualMessages(), std::move(re),
std::move(im), GetDefaultKind(TypeCategory::Real)));
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::Concat &x) {
if (auto both{common::AllPresent(Analyze(std::get<0>(x.t).value()),
Analyze(std::get<1>(x.t).value()))}) {
ConformabilityCheck(
GetContextualMessages(), std::get<0>(*both), std::get<1>(*both));
return std::visit(
common::visitors{
[&](Expr<SomeCharacter> &&cx, Expr<SomeCharacter> &&cy) {
return std::visit(
[&](auto &&cxk, auto &&cyk) -> MaybeExpr {
using Ty = ResultType<decltype(cxk)>;
if constexpr (std::is_same_v<Ty,
ResultType<decltype(cyk)>>) {
return {AsGenericExpr(
Concat<Ty::kind>{std::move(cxk), std::move(cyk)})};
} else {
Say("Operands of // must be the same kind of CHARACTER"_err_en_US);
return std::nullopt;
}
},
std::move(cx.u), std::move(cy.u));
},
[&](auto &&, auto &&) -> MaybeExpr {
Say("Operands of // must be CHARACTER"_err_en_US);
return std::nullopt;
},
},
std::move(std::get<0>(*both).u), std::move(std::get<1>(*both).u));
}
return std::nullopt;
}
// TODO: check defined operators for illegal intrinsic operator cases
template<typename PARSED>
MaybeExpr RelationHelper(
ExpressionAnalyzer &context, RelationalOperator opr, const PARSED &x) {
if (auto both{common::AllPresent(context.Analyze(std::get<0>(x.t).value()),
context.Analyze(std::get<1>(x.t).value()))}) {
ConformabilityCheck(context.GetContextualMessages(), std::get<0>(*both),
std::get<1>(*both));
return AsMaybeExpr(Relate(context.GetContextualMessages(), opr,
std::move(std::get<0>(*both)), std::move(std::get<1>(*both))));
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::LT &x) {
return RelationHelper(*this, RelationalOperator::LT, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::LE &x) {
return RelationHelper(*this, RelationalOperator::LE, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::EQ &x) {
return RelationHelper(*this, RelationalOperator::EQ, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::NE &x) {
return RelationHelper(*this, RelationalOperator::NE, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::GE &x) {
return RelationHelper(*this, RelationalOperator::GE, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::GT &x) {
return RelationHelper(*this, RelationalOperator::GT, x);
}
// TODO: check defined operators for illegal intrinsic operator cases
template<typename PARSED>
MaybeExpr LogicalHelper(
ExpressionAnalyzer &context, LogicalOperator opr, const PARSED &x) {
if (auto both{common::AllPresent(context.Analyze(std::get<0>(x.t).value()),
context.Analyze(std::get<1>(x.t).value()))}) {
return std::visit(
common::visitors{
[&](Expr<SomeLogical> &&lx, Expr<SomeLogical> &&ly) -> MaybeExpr {
ConformabilityCheck(context.GetContextualMessages(), lx, ly);
return {AsGenericExpr(
BinaryLogicalOperation(opr, std::move(lx), std::move(ly)))};
},
[&](auto &&, auto &&) -> MaybeExpr {
// TODO: extension: INTEGER and typeless operands
// ifort and PGI accept them if not overridden
// need to define IAND, IOR, IEOR intrinsic representation
context.Say(
"operands to LOGICAL operation must be LOGICAL"_err_en_US);
return {};
},
},
std::move(std::get<0>(*both).u), std::move(std::get<1>(*both).u));
}
return std::nullopt;
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::AND &x) {
return LogicalHelper(*this, LogicalOperator::And, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::OR &x) {
return LogicalHelper(*this, LogicalOperator::Or, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::EQV &x) {
return LogicalHelper(*this, LogicalOperator::Eqv, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::NEQV &x) {
return LogicalHelper(*this, LogicalOperator::Neqv, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::XOR &x) {
return LogicalHelper(*this, LogicalOperator::Neqv, x);
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr::DefinedBinary &) {
Say("TODO: DefinedBinary unimplemented"_err_en_US);
return std::nullopt;
}
// Converts, if appropriate, an original misparse of ambiguous syntax like
// A(1) as a function reference into an array reference or a structure
// constructor.
template<typename... A>
void FixMisparsedFunctionReference(const std::variant<A...> &constU) {
// The parse tree is updated in situ when resolving an ambiguous parse.
using uType = std::decay_t<decltype(constU)>;
auto &u{const_cast<uType &>(constU)};
if (auto *func{
std::get_if<common::Indirection<parser::FunctionReference>>(&u)}) {
parser::FunctionReference &funcRef{func->value()};
auto &proc{std::get<parser::ProcedureDesignator>(funcRef.v.t)};
if (auto *name{std::get_if<parser::Name>(&proc.u)}) {
if (name->symbol == nullptr) {
return;
}
Symbol &symbol{name->symbol->GetUltimate()};
if (symbol.has<semantics::ObjectEntityDetails>()) {
if constexpr (common::HasMember<common::Indirection<parser::Designator>,
uType>) {
u = common::Indirection{funcRef.ConvertToArrayElementRef()};
} else {
common::die("can't fix misparsed function as array reference");
}
} else if (symbol.has<semantics::DerivedTypeDetails>()) {
if constexpr (common::HasMember<parser::StructureConstructor, uType>) {
CHECK(symbol.scope() != nullptr);
const semantics::DeclTypeSpec *type{
symbol.scope()->FindInstantiatedDerivedType(
semantics::DerivedTypeSpec{symbol})};
CHECK(type != nullptr);
u = funcRef.ConvertToStructureConstructor(type->derivedTypeSpec());
} else {
common::die("can't fix misparsed function as structure constructor");
}
}
}
}
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Expr &expr) {
if (expr.typedExpr) {
// Expression was already checked by ExprChecker
return std::make_optional<Expr<SomeType>>(expr.typedExpr->v);
} else {
FixMisparsedFunctionReference(expr.u);
if (!expr.source.empty()) {
// Analyze the expression in a specified source position context for
// better error reporting.
auto save{GetFoldingContext().messages().SetLocation(expr.source)};
return Analyze(expr.u);
} else {
return Analyze(expr.u);
}
}
}
MaybeExpr ExpressionAnalyzer::Analyze(const parser::Variable &variable) {
FixMisparsedFunctionReference(variable.u);
return Analyze(variable.u);
}
Expr<SubscriptInteger> ExpressionAnalyzer::AnalyzeKindSelector(
TypeCategory category,
const std::optional<parser::KindSelector> &selector) {
int defaultKind{GetDefaultKind(category)};
if (!selector.has_value()) {
return Expr<SubscriptInteger>{defaultKind};
}
return std::visit(
common::visitors{
[&](const parser::ScalarIntConstantExpr &x)
-> Expr<SubscriptInteger> {
if (MaybeExpr kind{Analyze(x)}) {
Expr<SomeType> folded{
Fold(GetFoldingContext(), std::move(*kind))};
if (std::optional<std::int64_t> code{ToInt64(folded)}) {
if (CheckIntrinsicKind(category, *code)) {
return Expr<SubscriptInteger>{*code};
}
} else if (auto *intExpr{UnwrapExpr<Expr<SomeInteger>>(folded)}) {
return ConvertToType<SubscriptInteger>(std::move(*intExpr));
}
}
return Expr<SubscriptInteger>{defaultKind};
},
[&](const parser::KindSelector::StarSize &x)
-> Expr<SubscriptInteger> {
std::intmax_t size = x.v;
if (!CheckIntrinsicSize(category, size)) {
size = defaultKind;
} else if (category == TypeCategory::Complex) {
size /= 2;
}
return Expr<SubscriptInteger>{size};
},
},
selector->u);
}
int ExpressionAnalyzer::GetDefaultKind(common::TypeCategory category) {
return context_.defaultKinds().GetDefaultKind(category);
}
DynamicType ExpressionAnalyzer::GetDefaultKindOfType(
common::TypeCategory category) {
return {category, GetDefaultKind(category)};
}
bool ExpressionAnalyzer::CheckIntrinsicKind(
TypeCategory category, std::int64_t kind) {
if (IsValidKindOfIntrinsicType(category, kind)) {
return true;
} else {
Say("%s(KIND=%jd) is not a supported type"_err_en_US,
parser::ToUpperCaseLetters(EnumToString(category)).data(), kind);
return false;
}
}
bool ExpressionAnalyzer::CheckIntrinsicSize(
TypeCategory category, std::int64_t size) {
if (category == TypeCategory::Complex) {
// COMPLEX*16 == COMPLEX(KIND=8)
if (size % 2 == 0 && IsValidKindOfIntrinsicType(category, size / 2)) {
return true;
}
} else if (IsValidKindOfIntrinsicType(category, size)) {
return true;
}
Say("%s*%jd is not a supported type"_err_en_US,
parser::ToUpperCaseLetters(EnumToString(category)).data(), size);
return false;
}
bool ExpressionAnalyzer::AddAcImpliedDo(parser::CharBlock name, int kind) {
return acImpliedDos_.insert(std::make_pair(name, kind)).second;
}
void ExpressionAnalyzer::RemoveAcImpliedDo(parser::CharBlock name) {
auto iter{acImpliedDos_.find(name)};
if (iter != acImpliedDos_.end()) {
acImpliedDos_.erase(iter);
}
}
std::optional<int> ExpressionAnalyzer::IsAcImpliedDo(
parser::CharBlock name) const {
auto iter{acImpliedDos_.find(name)};
if (iter != acImpliedDos_.cend()) {
return {iter->second};
} else {
return std::nullopt;
}
}
}
namespace Fortran::semantics {
evaluate::Expr<evaluate::SubscriptInteger> AnalyzeKindSelector(
SemanticsContext &context, common::TypeCategory category,
const std::optional<parser::KindSelector> &selector) {
evaluate::ExpressionAnalyzer analyzer{context};
auto save{analyzer.GetContextualMessages().SetLocation(*context.location())};
return analyzer.AnalyzeKindSelector(category, selector);
}
void ExprChecker::Enter(const parser::Expr &expr) {
if (!expr.typedExpr) {
if (MaybeExpr checked{AnalyzeExpr(context_, expr)}) {
#if PMKDEBUG
// std::cout << "checked expression: " << *checked << '\n';
#endif
expr.typedExpr.reset(
new evaluate::GenericExprWrapper{std::move(*checked)});
} else {
#if PMKDEBUG
std::cout << "TODO: expression analysis failed for this expression: ";
parser::DumpTree(std::cout, expr);
#endif
}
}
}
void ExprChecker::Enter(const parser::Variable &var) {
#if PMKDEBUG
if (MaybeExpr checked{AnalyzeExpr(context_, var)}) {
// std::cout << "checked variable: " << *checked << '\n';
#else
if (AnalyzeExpr(context_, var)) {
#endif
} else {
#if PMKDEBUG
std::cout << "TODO: expression analysis failed for this variable: ";
DumpTree(std::cout, var);
#endif
}
}
}
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