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//===--- CurrentSourceLocExprScope.h ----------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines types used to track the current context needed to evaluate
// a SourceLocExpr.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_CURRENT_SOURCE_LOC_EXPR_SCOPE_H
#define LLVM_CLANG_AST_CURRENT_SOURCE_LOC_EXPR_SCOPE_H
#include <cassert>
namespace clang {
class Expr;
/// Represents the current source location and context used to determine the
/// value of the source location builtins (ex. __builtin_LINE), including the
/// context of default argument and default initializer expressions.
class CurrentSourceLocExprScope {
/// The CXXDefaultArgExpr or CXXDefaultInitExpr we're currently evaluating.
const Expr *DefaultExpr = nullptr;
public:
/// A RAII style scope guard used for tracking the current source
/// location and context as used by the source location builtins
/// (ex. __builtin_LINE).
class SourceLocExprScopeGuard;
const Expr *getDefaultExpr() const { return DefaultExpr; }
explicit CurrentSourceLocExprScope() = default;
private:
explicit CurrentSourceLocExprScope(const Expr *DefaultExpr)
: DefaultExpr(DefaultExpr) {}
CurrentSourceLocExprScope(CurrentSourceLocExprScope const &) = default;
CurrentSourceLocExprScope &
operator=(CurrentSourceLocExprScope const &) = default;
};
class CurrentSourceLocExprScope::SourceLocExprScopeGuard {
public:
SourceLocExprScopeGuard(const Expr *DefaultExpr,
CurrentSourceLocExprScope &Current)
: Current(Current), OldVal(Current), Enable(false) {
assert(DefaultExpr && "the new scope should not be empty");
if ((Enable = (Current.getDefaultExpr() == nullptr)))
Current = CurrentSourceLocExprScope(DefaultExpr);
}
~SourceLocExprScopeGuard() {
if (Enable)
Current = OldVal;
}
private:
SourceLocExprScopeGuard(SourceLocExprScopeGuard const &) = delete;
SourceLocExprScopeGuard &operator=(SourceLocExprScopeGuard const &) = delete;
CurrentSourceLocExprScope &Current;
CurrentSourceLocExprScope OldVal;
bool Enable;
};
} // end namespace clang
#endif // LLVM_CLANG_AST_CURRENT_SOURCE_LOC_EXPR_SCOPE_H
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