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| 1 | //===--- CurrentSourceLocExprScope.h ----------------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This file defines types used to track the current context needed to evaluate |
| 10 | // a SourceLocExpr. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #ifndef LLVM_CLANG_AST_CURRENTSOURCELOCEXPRSCOPE_H |
| 15 | #define LLVM_CLANG_AST_CURRENTSOURCELOCEXPRSCOPE_H |
| 16 | |
| 17 | #include <cassert> |
| 18 | |
| 19 | namespace clang { |
| 20 | class Expr; |
| 21 | |
| 22 | /// Represents the current source location and context used to determine the |
| 23 | /// value of the source location builtins (ex. __builtin_LINE), including the |
| 24 | /// context of default argument and default initializer expressions. |
| 25 | class CurrentSourceLocExprScope { |
| 26 | /// The CXXDefaultArgExpr or CXXDefaultInitExpr we're currently evaluating. |
| 27 | const Expr *DefaultExpr = nullptr; |
| 28 | |
| 29 | public: |
| 30 | /// A RAII style scope guard used for tracking the current source |
| 31 | /// location and context as used by the source location builtins |
| 32 | /// (ex. __builtin_LINE). |
| 33 | class SourceLocExprScopeGuard; |
| 34 | |
| 35 | const Expr *getDefaultExpr() const { return DefaultExpr; } |
| 36 | |
| 37 | explicit CurrentSourceLocExprScope() = default; |
| 38 | |
| 39 | private: |
| 40 | explicit CurrentSourceLocExprScope(const Expr *DefaultExpr) |
| 41 | : DefaultExpr(DefaultExpr) {} |
| 42 | |
| 43 | CurrentSourceLocExprScope(CurrentSourceLocExprScope const &) = default; |
| 44 | CurrentSourceLocExprScope & |
| 45 | operator=(CurrentSourceLocExprScope const &) = default; |
| 46 | }; |
| 47 | |
| 48 | class CurrentSourceLocExprScope::SourceLocExprScopeGuard { |
| 49 | public: |
| 50 | SourceLocExprScopeGuard(const Expr *DefaultExpr, |
| 51 | CurrentSourceLocExprScope &Current) |
| 52 | : Current(Current), OldVal(Current), Enable(false) { |
| 53 | assert(DefaultExpr && "the new scope should not be empty"); |
| 54 | if ((Enable = (Current.getDefaultExpr() == nullptr))) |
| 55 | Current = CurrentSourceLocExprScope(DefaultExpr); |
| 56 | } |
| 57 | |
| 58 | ~SourceLocExprScopeGuard() { |
| 59 | if (Enable) |
| 60 | Current = OldVal; |
| 61 | } |
| 62 | |
| 63 | private: |
| 64 | SourceLocExprScopeGuard(SourceLocExprScopeGuard const &) = delete; |
| 65 | SourceLocExprScopeGuard &operator=(SourceLocExprScopeGuard const &) = delete; |
| 66 | |
| 67 | CurrentSourceLocExprScope &Current; |
| 68 | CurrentSourceLocExprScope OldVal; |
| 69 | bool Enable; |
| 70 | }; |
| 71 | |
| 72 | } // end namespace clang |
| 73 | |
| 74 | #endif // LLVM_CLANG_AST_CURRENTSOURCELOCEXPRSCOPE_H |
| 75 |
Warning: This file is not a C or C++ file. It does not have highlighting.