100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
//===-- lib/Parser/preprocessor.h -------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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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 "token-sequence.h"
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#include "flang/Parser/char-block.h"
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#include "flang/Parser/provenance.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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class Preprocessor;
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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, Prescanner &);
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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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const AllSources &allSources() const { return allSources_; }
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AllSources &allSources() { return 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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bool IsNameDefined(const CharBlock &);
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std::optional<TokenSequence> MacroReplacement(
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const TokenSequence &, 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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TokenSequence ReplaceMacros(const TokenSequence &, 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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} // namespace Fortran::parser
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#endif // FORTRAN_PARSER_PREPROCESSOR_H_
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