clang  14.0.0git
CurrentSourceLocExprScope.h
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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_CURRENT_SOURCE_LOC_EXPR_SCOPE_H
15 #define LLVM_CLANG_AST_CURRENT_SOURCE_LOC_EXPR_SCOPE_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.
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).
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 
45  operator=(CurrentSourceLocExprScope const &) = default;
46 };
47 
49 public:
50  SourceLocExprScopeGuard(const Expr *DefaultExpr,
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 
59  if (Enable)
60  Current = OldVal;
61  }
62 
63 private:
65  SourceLocExprScopeGuard &operator=(SourceLocExprScopeGuard const &) = delete;
66 
69  bool Enable;
70 };
71 
72 } // end namespace clang
73 
74 #endif // LLVM_CLANG_AST_CURRENT_SOURCE_LOC_EXPR_SCOPE_H
clang::CurrentSourceLocExprScope::getDefaultExpr
const Expr * getDefaultExpr() const
Definition: CurrentSourceLocExprScope.h:35
clang::CurrentSourceLocExprScope::SourceLocExprScopeGuard::SourceLocExprScopeGuard
SourceLocExprScopeGuard(const Expr *DefaultExpr, CurrentSourceLocExprScope &Current)
Definition: CurrentSourceLocExprScope.h:50
clang::CurrentSourceLocExprScope::CurrentSourceLocExprScope
CurrentSourceLocExprScope()=default
clang::CurrentSourceLocExprScope::SourceLocExprScopeGuard
Definition: CurrentSourceLocExprScope.h:48
false
#define false
Definition: stdbool.h:17
clang::CurrentSourceLocExprScope
Represents the current source location and context used to determine the value of the source location...
Definition: CurrentSourceLocExprScope.h:25
clang
Definition: CalledOnceCheck.h:17
clang::Expr
This represents one expression.
Definition: Expr.h:109
clang::CurrentSourceLocExprScope::SourceLocExprScopeGuard::~SourceLocExprScopeGuard
~SourceLocExprScopeGuard()
Definition: CurrentSourceLocExprScope.h:58