85db492ea0
Original-commit: flang-compiler/f18@c05c96c474 Reviewed-on: https://github.com/flang-compiler/f18/pull/590 Tree-same-pre-rewrite: false
234 lines
7.1 KiB
C++
234 lines
7.1 KiB
C++
// Copyright (c) 2018-2019, 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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#include "semantics.h"
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#include "assignment.h"
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#include "canonicalize-do.h"
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#include "check-allocate.h"
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#include "check-arithmeticif.h"
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#include "check-coarray.h"
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#include "check-deallocate.h"
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#include "check-do.h"
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#include "check-if-stmt.h"
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#include "check-io.h"
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#include "check-nullify.h"
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#include "check-omp-structure.h"
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#include "check-return.h"
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#include "check-stop.h"
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#include "expression.h"
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#include "mod-file.h"
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#include "resolve-labels.h"
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#include "resolve-names.h"
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#include "rewrite-parse-tree.h"
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#include "scope.h"
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#include "symbol.h"
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#include "../common/default-kinds.h"
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#include "../parser/parse-tree-visitor.h"
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namespace Fortran::semantics {
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static void DoDumpSymbols(std::ostream &, const Scope &, int indent = 0);
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static void PutIndent(std::ostream &, int indent);
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// A parse tree visitor that calls Enter/Leave functions from each checker
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// class C supplied as template parameters. Enter is called before the node's
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// children are visited, Leave is called after. No two checkers may have the
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// same Enter or Leave function. Each checker must be constructible from
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// SemanticsContext and have BaseChecker as a virtual base class.
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template<typename... C> class SemanticsVisitor : public virtual C... {
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public:
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using C::Enter...;
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using C::Leave...;
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using BaseChecker::Enter;
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using BaseChecker::Leave;
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SemanticsVisitor(SemanticsContext &context)
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: C{context}..., context_{context} {}
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template<typename N> bool Pre(const N &node) {
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Enter(node);
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return true;
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}
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template<typename N> void Post(const N &node) { Leave(node); }
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template<typename T> bool Pre(const parser::Statement<T> &node) {
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context_.set_location(&node.source);
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Enter(node);
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return true;
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}
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template<typename T> void Post(const parser::Statement<T> &node) {
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Leave(node);
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context_.set_location(nullptr);
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}
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bool Walk(const parser::Program &program) {
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parser::Walk(program, *this);
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return !context_.AnyFatalError();
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}
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private:
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SemanticsContext &context_;
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};
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using StatementSemanticsPass1 = ExprChecker;
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using StatementSemanticsPass2 = SemanticsVisitor<AllocateChecker,
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ArithmeticIfStmtChecker, AssignmentChecker, CoarrayChecker,
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DeallocateChecker, DoChecker, IfStmtChecker, IoChecker, NullifyChecker,
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OmpStructureChecker, ReturnStmtChecker, StopChecker>;
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static bool PerformStatementSemantics(
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SemanticsContext &context, parser::Program &program) {
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ResolveNames(context, program);
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RewriteParseTree(context, program);
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StatementSemanticsPass1{context}.Walk(program);
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return StatementSemanticsPass2{context}.Walk(program);
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}
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SemanticsContext::SemanticsContext(
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const common::IntrinsicTypeDefaultKinds &defaultKinds,
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const parser::LanguageFeatureControl &languageFeatures,
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parser::AllSources &allSources)
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: defaultKinds_{defaultKinds}, languageFeatures_{languageFeatures},
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allSources_{allSources},
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intrinsics_{evaluate::IntrinsicProcTable::Configure(defaultKinds)},
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foldingContext_{parser::ContextualMessages{&messages_}, defaultKinds} {}
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SemanticsContext::~SemanticsContext() {}
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int SemanticsContext::GetDefaultKind(TypeCategory category) const {
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return defaultKinds_.GetDefaultKind(category);
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}
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bool SemanticsContext::IsEnabled(parser::LanguageFeature feature) const {
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return languageFeatures_.IsEnabled(feature);
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}
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bool SemanticsContext::ShouldWarn(parser::LanguageFeature feature) const {
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return languageFeatures_.ShouldWarn(feature);
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}
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const DeclTypeSpec &SemanticsContext::MakeNumericType(
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TypeCategory category, int kind) {
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if (kind == 0) {
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kind = GetDefaultKind(category);
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}
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return globalScope_.MakeNumericType(category, KindExpr{kind});
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}
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const DeclTypeSpec &SemanticsContext::MakeLogicalType(int kind) {
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if (kind == 0) {
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kind = GetDefaultKind(TypeCategory::Logical);
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}
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return globalScope_.MakeLogicalType(KindExpr{kind});
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}
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bool SemanticsContext::AnyFatalError() const {
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return !messages_.empty() &&
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(warningsAreErrors_ || messages_.AnyFatalError());
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}
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bool SemanticsContext::HasError(const Symbol &symbol) {
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return CheckError(symbol.test(Symbol::Flag::Error));
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}
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bool SemanticsContext::HasError(const Symbol *symbol) {
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return CheckError(!symbol || HasError(*symbol));
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}
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bool SemanticsContext::HasError(const parser::Name &name) {
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return HasError(name.symbol);
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}
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void SemanticsContext::SetError(Symbol &symbol, bool value) {
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if (value) {
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CHECK(AnyFatalError());
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symbol.set(Symbol::Flag::Error);
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}
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}
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bool SemanticsContext::CheckError(bool error) {
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CHECK(!error || AnyFatalError());
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return error;
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}
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const Scope &SemanticsContext::FindScope(parser::CharBlock source) const {
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return const_cast<SemanticsContext *>(this)->FindScope(source);
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}
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Scope &SemanticsContext::FindScope(parser::CharBlock source) {
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if (auto *scope{globalScope_.FindScope(source)}) {
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return *scope;
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} else {
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common::die("invalid source location");
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}
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}
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bool Semantics::Perform() {
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return ValidateLabels(context_, program_) &&
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parser::CanonicalizeDo(program_) && // force line break
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PerformStatementSemantics(context_, program_) &&
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ModFileWriter{context_}.WriteAll();
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}
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void Semantics::EmitMessages(std::ostream &os) const {
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context_.messages().Emit(os, cooked_);
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}
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void Semantics::DumpSymbols(std::ostream &os) {
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DoDumpSymbols(os, context_.globalScope());
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}
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void DoDumpSymbols(std::ostream &os, const Scope &scope, int indent) {
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PutIndent(os, indent);
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os << Scope::EnumToString(scope.kind()) << " scope:";
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if (const auto *symbol{scope.symbol()}) {
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os << ' ' << symbol->name().ToString();
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}
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os << '\n';
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++indent;
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for (const auto &pair : scope) {
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const auto &symbol{*pair.second};
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PutIndent(os, indent);
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os << symbol << '\n';
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if (const auto *details{symbol.detailsIf<GenericDetails>()}) {
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if (const auto &type{details->derivedType()}) {
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PutIndent(os, indent);
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os << *type << '\n';
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}
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}
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}
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if (!scope.equivalenceSets().empty()) {
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PutIndent(os, indent);
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os << "Equivalence Sets:";
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for (const auto &set : scope.equivalenceSets()) {
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os << ' ';
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char sep = '(';
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for (const auto &object : set) {
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os << sep << object.AsFortran();
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sep = ',';
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}
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os << ')';
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}
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os << '\n';
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}
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for (const auto &pair : scope.commonBlocks()) {
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const auto &symbol{*pair.second};
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PutIndent(os, indent);
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os << symbol << '\n';
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}
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for (const auto &child : scope.children()) {
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DoDumpSymbols(os, child, indent);
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}
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--indent;
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}
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static void PutIndent(std::ostream &os, int indent) {
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for (int i = 0; i < indent; ++i) {
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os << " ";
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}
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}
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}
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