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// Copyright (c) 2018, 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 "scope.h"
#include "symbol.h"
#include <memory>
namespace Fortran::semantics {
Symbols<1024> Scope::allSymbols;
bool Scope::IsModule() const {
return kind_ == Kind::Module && !symbol_->get<ModuleDetails>().isSubmodule();
}
Scope &Scope::MakeScope(Kind kind, Symbol *symbol) {
children_.emplace_back(*this, kind, symbol);
return children_.back();
}
Scope::iterator Scope::find(const SourceName &name) {
auto it{symbols_.find(name)};
if (it != end()) {
it->second->add_occurrence(name);
}
return it;
}
Scope::const_iterator Scope::find(const SourceName &name) const {
return symbols_.find(name);
}
Scope::size_type Scope::erase(const SourceName &name) {
auto it{symbols_.find(name)};
if (it != end()) {
it->second->remove_occurrence(name);
symbols_.erase(it);
return 1;
} else {
return 0;
}
}
Symbol *Scope::FindSymbol(const SourceName &name) {
if (kind() == Kind::DerivedType) {
return parent_.FindSymbol(name);
}
const auto it{find(name)};
if (it != end()) {
return it->second;
} else if (CanImport(name)) {
return parent_.FindSymbol(name);
} else {
return nullptr;
}
}
Scope *Scope::FindSubmodule(const SourceName &name) const {
auto it{submodules_.find(name)};
if (it == submodules_.end()) {
return nullptr;
} else {
return it->second;
}
}
bool Scope::AddSubmodule(const SourceName &name, Scope &submodule) {
return submodules_.emplace(name, &submodule).second;
}
DerivedTypeSpec &Scope::MakeDerivedTypeSpec(const SourceName &name) {
derivedTypeSpecs_.emplace_back(name);
return derivedTypeSpecs_.back();
}
Scope::ImportKind Scope::GetImportKind() const {
if (importKind_) {
return *importKind_;
}
if (symbol_) {
if (auto *details{symbol_->detailsIf<SubprogramDetails>()}) {
if (details->isInterface()) {
return ImportKind::None; // default for interface body
}
}
}
return ImportKind::Default;
}
std::optional<parser::MessageFixedText> Scope::SetImportKind(ImportKind kind) {
if (!importKind_.has_value()) {
importKind_ = kind;
return std::nullopt;
}
bool hasNone{kind == ImportKind::None || *importKind_ == ImportKind::None};
bool hasAll{kind == ImportKind::All || *importKind_ == ImportKind::All};
// Check C8100 and C898: constraints on multiple IMPORT statements
if (hasNone || hasAll) {
return hasNone
? "IMPORT,NONE must be the only IMPORT statement in a scope"_err_en_US
: "IMPORT,ALL must be the only IMPORT statement in a scope"_err_en_US;
} else if (kind != *importKind_ &&
(kind != ImportKind::Only || kind != ImportKind::Only)) {
return "Every IMPORT must have ONLY specifier if one of them does"_err_en_US;
} else {
return std::nullopt;
}
}
bool Scope::add_importName(const SourceName &name) {
if (!parent_.FindSymbol(name)) {
return false;
}
importNames_.insert(name);
return true;
}
// true if name can be imported or host-associated from parent scope.
bool Scope::CanImport(const SourceName &name) const {
if (kind_ == Kind::Global) {
return false;
}
switch (GetImportKind()) {
case ImportKind::None: return false;
case ImportKind::All:
case ImportKind::Default: return true;
case ImportKind::Only: return importNames_.count(name) > 0;
default: CRASH_NO_CASE;
}
}
std::ostream &operator<<(std::ostream &os, const Scope &scope) {
os << Scope::EnumToString(scope.kind()) << " scope: ";
if (auto *symbol{scope.symbol()}) {
os << *symbol << ' ';
}
os << scope.children_.size() << " children\n";
for (const auto &pair : scope.symbols_) {
const auto *symbol{pair.second};
os << " " << *symbol << '\n';
}
return os;
}
} // namespace Fortran::semantics
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