| 1 | //===--- CurrentSourceLocExprScope.h ----------------------------*- 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 types used to track the current context needed to evaluate |
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| 10 | // a SourceLocExpr. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #ifndef LLVM_CLANG_AST_CURRENTSOURCELOCEXPRSCOPE_H |
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| 15 | #define LLVM_CLANG_AST_CURRENTSOURCELOCEXPRSCOPE_H |
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| 16 | |
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| 17 | #include <cassert> |
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| 18 | |
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| 19 | namespace clang { |
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| 20 | class Expr; |
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| 21 | |
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| 22 | /// Represents the current source location and context used to determine the |
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| 23 | /// value of the source location builtins (ex. __builtin_LINE), including the |
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| 24 | /// context of default argument and default initializer expressions. |
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| 25 | class CurrentSourceLocExprScope { |
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| 26 | /// The CXXDefaultArgExpr or CXXDefaultInitExpr we're currently evaluating. |
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| 27 | const Expr *DefaultExpr = nullptr; |
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| 28 | |
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| 29 | public: |
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| 30 | /// A RAII style scope guard used for tracking the current source |
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| 31 | /// location and context as used by the source location builtins |
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| 32 | /// (ex. __builtin_LINE). |
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| 33 | class SourceLocExprScopeGuard; |
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| 34 | |
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| 35 | const Expr *getDefaultExpr() const { return DefaultExpr; } |
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| 36 | |
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| 37 | explicit CurrentSourceLocExprScope() = default; |
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| 38 | |
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| 39 | private: |
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| 40 | explicit CurrentSourceLocExprScope(const Expr *DefaultExpr) |
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| 41 | : DefaultExpr(DefaultExpr) {} |
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| 42 | |
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| 43 | CurrentSourceLocExprScope(CurrentSourceLocExprScope const &) = default; |
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| 44 | CurrentSourceLocExprScope & |
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| 45 | operator=(CurrentSourceLocExprScope const &) = default; |
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| 46 | }; |
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| 47 | |
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| 48 | class CurrentSourceLocExprScope::SourceLocExprScopeGuard { |
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| 49 | public: |
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| 50 | SourceLocExprScopeGuard(const Expr *DefaultExpr, |
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| 51 | CurrentSourceLocExprScope &Current) |
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| 52 | : Current(Current), OldVal(Current), Enable(false) { |
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| 53 | assert(DefaultExpr && "the new scope should not be empty" ); |
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| 54 | if ((Enable = (Current.getDefaultExpr() == nullptr))) |
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| 55 | Current = CurrentSourceLocExprScope(DefaultExpr); |
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| 56 | } |
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| 57 | |
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| 58 | ~SourceLocExprScopeGuard() { |
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| 59 | if (Enable) |
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| 60 | Current = OldVal; |
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| 61 | } |
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| 62 | |
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| 63 | private: |
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| 64 | SourceLocExprScopeGuard(SourceLocExprScopeGuard const &) = delete; |
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| 65 | SourceLocExprScopeGuard &operator=(SourceLocExprScopeGuard const &) = delete; |
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| 66 | |
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| 67 | CurrentSourceLocExprScope &Current; |
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| 68 | CurrentSourceLocExprScope OldVal; |
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| 69 | bool Enable; |
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| 70 | }; |
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| 71 | |
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| 72 | } // end namespace clang |
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| 73 | |
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| 74 | #endif // LLVM_CLANG_AST_CURRENTSOURCELOCEXPRSCOPE_H |
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| 75 | |
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