| 1 | //===--- CXX.h - Public interfaces for the C++ grammar -----------*- C++-*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file defines public interfaces for the C++ grammar |
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| 10 | // (pseudo/lib/cxx/cxx.bnf). It provides a fast way to access core building |
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| 11 | // pieces of the LR parser, e.g. Grammar, LRTable, rather than parsing the |
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| 12 | // grammar file at the runtime. |
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| 13 | // |
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| 14 | // We do a compilation of the C++ BNF grammar at build time, and generate |
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| 15 | // critical data sources. The implementation of the interfaces are based on the |
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| 16 | // generated data sources. |
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| 17 | // |
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| 18 | // FIXME: not everything is fully compiled yet. The implementation of the |
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| 19 | // interfaces are still parsing the grammar file at the runtime. |
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| 20 | // |
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| 21 | //===----------------------------------------------------------------------===// |
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| 22 | |
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| 23 | #ifndef CLANG_PSEUDO_CXX_CXX_H |
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| 24 | #define CLANG_PSEUDO_CXX_CXX_H |
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| 25 | |
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| 26 | #include "clang-pseudo/Language.h" |
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| 27 | #include "clang-pseudo/grammar/Grammar.h" |
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| 28 | |
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| 29 | namespace clang { |
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| 30 | namespace pseudo { |
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| 31 | namespace cxx { |
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| 32 | |
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| 33 | // We want enums to be scoped but implicitly convertible to RuleID etc. |
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| 34 | // So create regular (unscoped) enums inside subnamespaces of `detail`. |
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| 35 | // Then add aliases for them outside `detail`. |
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| 36 | namespace detail { |
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| 37 | namespace symbols { |
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| 38 | enum Symbol : SymbolID { |
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| 39 | #define NONTERMINAL(X, Y) X = Y, |
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| 40 | #include "CXXSymbols.inc" |
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| 41 | #undef NONTERMINAL |
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| 42 | }; |
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| 43 | } // namespace symbols |
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| 44 | |
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| 45 | namespace extensions { |
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| 46 | enum Extension : ExtensionID { |
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| 47 | #define EXTENSION(X, Y) X = Y, |
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| 48 | #include "CXXSymbols.inc" |
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| 49 | #undef EXTENSION |
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| 50 | }; |
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| 51 | } // namespace extensions |
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| 52 | |
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| 53 | namespace rules { |
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| 54 | // For each symbol we close the last symbol's enum+namespace and open new ones. |
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| 55 | // We need a dummy namespace+enum so that this works for the first rule. |
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| 56 | namespace dummy { |
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| 57 | enum Dummy { |
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| 58 | //clang-format off |
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| 59 | #define NONTERMINAL(NAME, ID) \ |
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| 60 | }; \ |
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| 61 | } \ |
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| 62 | namespace NAME { \ |
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| 63 | enum Rule : RuleID { |
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| 64 | //clang-format on |
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| 65 | #define RULE(LHS, RHS, ID) RHS = ID, |
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| 66 | #include "CXXSymbols.inc" |
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| 67 | }; |
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| 68 | } |
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| 69 | } // namespace rules |
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| 70 | } // namespace detail |
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| 71 | |
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| 72 | // Symbol represents nonterminal symbols in the C++ grammar. |
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| 73 | // It provides a simple uniform way to access a particular nonterminal. |
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| 74 | using Symbol = detail::symbols::Symbol; |
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| 75 | |
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| 76 | using Extension = detail::extensions::Extension; |
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| 77 | |
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| 78 | namespace rule { |
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| 79 | #define NONTERMINAL(NAME, ID) using NAME = detail::rules::NAME::Rule; |
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| 80 | #include "CXXSymbols.inc" |
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| 81 | } // namespace rule |
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| 82 | |
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| 83 | // Returns the Language for the cxx.bnf grammar. |
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| 84 | const Language &getLanguage(); |
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| 85 | |
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| 86 | } // namespace cxx |
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| 87 | |
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| 88 | } // namespace pseudo |
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| 89 | } // namespace clang |
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| 90 | |
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| 91 | #endif // CLANG_PSEUDO_CXX_CXX_H |
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| 92 | |
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