| // Copyright 2016 The SwiftShader Authors. 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. |
| |
| #ifndef COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_ |
| #define COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_ |
| |
| #include <cassert> |
| #include <memory> |
| #include <vector> |
| |
| #include "Lexer.h" |
| #include "Macro.h" |
| #include "pp_utils.h" |
| |
| namespace pp |
| { |
| |
| class Diagnostics; |
| |
| class MacroExpander : public Lexer |
| { |
| public: |
| MacroExpander(Lexer* lexer, MacroSet* macroSet, Diagnostics* diagnostics, bool parseDefined); |
| virtual ~MacroExpander(); |
| |
| virtual void lex(Token* token); |
| |
| private: |
| PP_DISALLOW_COPY_AND_ASSIGN(MacroExpander); |
| |
| void getToken(Token* token); |
| void ungetToken(const Token& token); |
| bool isNextTokenLeftParen(); |
| |
| bool pushMacro(const Macro& macro, const Token& identifier); |
| void popMacro(); |
| |
| bool expandMacro(const Macro& macro, |
| const Token& identifier, |
| std::vector<Token>* replacements); |
| |
| typedef std::vector<Token> MacroArg; |
| bool collectMacroArgs(const Macro& macro, |
| const Token& identifier, |
| std::vector<MacroArg>* args); |
| void replaceMacroParams(const Macro& macro, |
| const std::vector<MacroArg>& args, |
| std::vector<Token>* replacements); |
| |
| struct MacroContext |
| { |
| const Macro* macro; |
| size_t index; |
| std::vector<Token> replacements; |
| |
| MacroContext() : macro(0), index(0) { } |
| bool empty() const { return index == replacements.size(); } |
| const Token& get() { return replacements[index++]; } |
| void unget() { assert(index > 0); --index; } |
| }; |
| |
| Lexer* mLexer; |
| MacroSet* mMacroSet; |
| Diagnostics* mDiagnostics; |
| const bool mParseDefined; |
| |
| std::auto_ptr<Token> mReserveToken; |
| std::vector<MacroContext*> mContextStack; |
| }; |
| |
| } // namespace pp |
| #endif // COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_ |
| |