1//===--- ExceptionSpecificationType.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/// \file
10/// Defines the ExceptionSpecificationType enumeration and various
11/// utility functions.
12///
13//===----------------------------------------------------------------------===//
14#ifndef LLVM_CLANG_BASIC_EXCEPTIONSPECIFICATIONTYPE_H
15#define LLVM_CLANG_BASIC_EXCEPTIONSPECIFICATIONTYPE_H
16
17namespace clang {
18
19/// The various types of exception specifications that exist in C++11.
20enum ExceptionSpecificationType {
21 EST_None, ///< no exception specification
22 EST_DynamicNone, ///< throw()
23 EST_Dynamic, ///< throw(T1, T2)
24 EST_MSAny, ///< Microsoft throw(...) extension
25 EST_BasicNoexcept, ///< noexcept
26 EST_DependentNoexcept,///< noexcept(expression), value-dependent
27 EST_NoexceptFalse, ///< noexcept(expression), evals to 'false'
28 EST_NoexceptTrue, ///< noexcept(expression), evals to 'true'
29 EST_Unevaluated, ///< not evaluated yet, for special member function
30 EST_Uninstantiated, ///< not instantiated yet
31 EST_Unparsed ///< not parsed yet
32};
33
34inline bool isDynamicExceptionSpec(ExceptionSpecificationType ESpecType) {
35 return ESpecType >= EST_DynamicNone && ESpecType <= EST_MSAny;
36}
37
38inline bool isComputedNoexcept(ExceptionSpecificationType ESpecType) {
39 return ESpecType >= EST_DependentNoexcept &&
40 ESpecType <= EST_NoexceptTrue;
41}
42
43inline bool isNoexceptExceptionSpec(ExceptionSpecificationType ESpecType) {
44 return ESpecType == EST_BasicNoexcept || isComputedNoexcept(ESpecType);
45}
46
47inline bool isUnresolvedExceptionSpec(ExceptionSpecificationType ESpecType) {
48 return ESpecType == EST_Unevaluated || ESpecType == EST_Uninstantiated;
49}
50
51/// Possible results from evaluation of a noexcept expression.
52enum CanThrowResult {
53 CT_Cannot,
54 CT_Dependent,
55 CT_Can
56};
57
58inline CanThrowResult mergeCanThrow(CanThrowResult CT1, CanThrowResult CT2) {
59 // CanThrowResult constants are ordered so that the maximum is the correct
60 // merge result.
61 return CT1 > CT2 ? CT1 : CT2;
62}
63
64} // end namespace clang
65
66#endif // LLVM_CLANG_BASIC_EXCEPTIONSPECIFICATIONTYPE_H
67