1 | //===--- EnterExpressionEvaluationContext.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 | #ifndef LLVM_CLANG_SEMA_ENTEREXPRESSIONEVALUATIONCONTEXT_H |
10 | #define LLVM_CLANG_SEMA_ENTEREXPRESSIONEVALUATIONCONTEXT_H |
11 | |
12 | #include "clang/Sema/Sema.h" |
13 | |
14 | namespace clang { |
15 | |
16 | class Decl; |
17 | |
18 | /// RAII object that enters a new expression evaluation context. |
19 | class EnterExpressionEvaluationContext { |
20 | Sema &Actions; |
21 | bool Entered = true; |
22 | |
23 | public: |
24 | EnterExpressionEvaluationContext( |
25 | Sema &Actions, Sema::ExpressionEvaluationContext NewContext, |
26 | Decl *LambdaContextDecl = nullptr, |
27 | Sema::ExpressionEvaluationContextRecord::ExpressionKind ExprContext = |
28 | Sema::ExpressionEvaluationContextRecord::EK_Other, |
29 | bool ShouldEnter = true) |
30 | : Actions(Actions), Entered(ShouldEnter) { |
31 | if (Entered) |
32 | Actions.PushExpressionEvaluationContext(NewContext, LambdaContextDecl, |
33 | Type: ExprContext); |
34 | } |
35 | EnterExpressionEvaluationContext( |
36 | Sema &Actions, Sema::ExpressionEvaluationContext NewContext, |
37 | Sema::ReuseLambdaContextDecl_t, |
38 | Sema::ExpressionEvaluationContextRecord::ExpressionKind ExprContext = |
39 | Sema::ExpressionEvaluationContextRecord::EK_Other) |
40 | : Actions(Actions) { |
41 | Actions.PushExpressionEvaluationContext( |
42 | NewContext, Sema::ReuseLambdaContextDecl, Type: ExprContext); |
43 | } |
44 | |
45 | enum InitListTag { InitList }; |
46 | EnterExpressionEvaluationContext(Sema &Actions, InitListTag, |
47 | bool ShouldEnter = true) |
48 | : Actions(Actions), Entered(false) { |
49 | // In C++11 onwards, narrowing checks are performed on the contents of |
50 | // braced-init-lists, even when they occur within unevaluated operands. |
51 | // Therefore we still need to instantiate constexpr functions used in such |
52 | // a context. |
53 | if (ShouldEnter && Actions.isUnevaluatedContext() && |
54 | Actions.getLangOpts().CPlusPlus11) { |
55 | Actions.PushExpressionEvaluationContext( |
56 | NewContext: Sema::ExpressionEvaluationContext::UnevaluatedList); |
57 | Entered = true; |
58 | } |
59 | } |
60 | |
61 | ~EnterExpressionEvaluationContext() { |
62 | if (Entered) |
63 | Actions.PopExpressionEvaluationContext(); |
64 | } |
65 | }; |
66 | |
67 | } // namespace clang |
68 | |
69 | #endif |
70 | |