f7e7cb349b
Original-commit: flang-compiler/f18@aa7f55e15f Reviewed-on: https://github.com/flang-compiler/f18/pull/217
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FORTRAN_PARSER_PREPROCESSOR_H_
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#define FORTRAN_PARSER_PREPROCESSOR_H_
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// A Fortran-aware preprocessing module used by the prescanner to implement
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// preprocessing directives and macro replacement. Intended to be efficient
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// enough to always run on all source files even when no preprocessing is
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// performed, so that special compiler command options &/or source file name
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// extensions for preprocessing will not be necessary.
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#include "char-block.h"
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#include "provenance.h"
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#include "token-sequence.h"
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#include <cstddef>
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#include <list>
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#include <stack>
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#include <string>
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#include <unordered_map>
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#include <vector>
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namespace Fortran::parser {
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class Prescanner;
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// Defines a macro
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class Definition {
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public:
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Definition(const TokenSequence &, std::size_t firstToken, std::size_t tokens);
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Definition(const std::vector<std::string> &argNames, const TokenSequence &,
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std::size_t firstToken, std::size_t tokens, bool isVariadic = false);
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Definition(const std::string &predefined, AllSources &);
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bool isFunctionLike() const { return isFunctionLike_; }
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std::size_t argumentCount() const { return argumentCount_; }
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bool isVariadic() const { return isVariadic_; }
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bool isDisabled() const { return isDisabled_; }
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bool isPredefined() const { return isPredefined_; }
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const TokenSequence &replacement() const { return replacement_; }
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bool set_isDisabled(bool disable);
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TokenSequence Apply(const std::vector<TokenSequence> &args, AllSources &);
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private:
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static TokenSequence Tokenize(const std::vector<std::string> &argNames,
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const TokenSequence &token, std::size_t firstToken, std::size_t tokens);
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bool isFunctionLike_{false};
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std::size_t argumentCount_{0};
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bool isVariadic_{false};
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bool isDisabled_{false};
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bool isPredefined_{false};
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TokenSequence replacement_;
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};
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// Preprocessing state
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class Preprocessor {
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public:
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explicit Preprocessor(AllSources &);
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void Define(std::string macro, std::string value);
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void Undefine(std::string macro);
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std::optional<TokenSequence> MacroReplacement(
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const TokenSequence &, const Prescanner &);
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// Implements a preprocessor directive.
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void Directive(const TokenSequence &, Prescanner *);
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private:
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enum class IsElseActive { No, Yes };
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enum class CanDeadElseAppear { No, Yes };
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CharBlock SaveTokenAsName(const CharBlock &);
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bool IsNameDefined(const CharBlock &);
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TokenSequence ReplaceMacros(const TokenSequence &, const Prescanner &);
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void SkipDisabledConditionalCode(
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const std::string &, IsElseActive, Prescanner *, ProvenanceRange);
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bool IsIfPredicateTrue(const TokenSequence &expr, std::size_t first,
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std::size_t exprTokens, Prescanner *);
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AllSources &allSources_;
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std::list<std::string> names_;
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std::unordered_map<CharBlock, Definition> definitions_;
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std::stack<CanDeadElseAppear> ifStack_;
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};
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}
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#endif // FORTRAN_PARSER_PREPROCESSOR_H_
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