| 1 | //= ObjCNoReturn.cpp - Handling of Cocoa APIs known not to return --*- C++ -*--- |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements special handling of recognizing ObjC API hooks that |
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| 10 | // do not return but aren't marked as such in API headers. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #include "clang/AST/ASTContext.h" |
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| 15 | #include "clang/AST/ExprObjC.h" |
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| 16 | #include "clang/Analysis/DomainSpecific/ObjCNoReturn.h" |
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| 17 | |
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| 18 | using namespace clang; |
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| 19 | |
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| 20 | static bool isSubclass(const ObjCInterfaceDecl *Class, |
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| 21 | const IdentifierInfo *II) { |
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| 22 | if (!Class) |
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| 23 | return false; |
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| 24 | if (Class->getIdentifier() == II) |
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| 25 | return true; |
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| 26 | return isSubclass(Class: Class->getSuperClass(), II); |
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| 27 | } |
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| 28 | |
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| 29 | ObjCNoReturn::ObjCNoReturn(ASTContext &C) |
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| 30 | : RaiseSel(GetNullarySelector("raise" , C)), |
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| 31 | NSExceptionII(&C.Idents.get(Name: "NSException" )) |
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| 32 | { |
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| 33 | // Generate selectors. |
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| 34 | SmallVector<const IdentifierInfo *, 3> II; |
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| 35 | |
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| 36 | // raise:format: |
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| 37 | II.push_back(Elt: &C.Idents.get(Name: "raise" )); |
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| 38 | II.push_back(Elt: &C.Idents.get(Name: "format" )); |
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| 39 | NSExceptionInstanceRaiseSelectors[0] = |
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| 40 | C.Selectors.getSelector(II.size(), &II[0]); |
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| 41 | |
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| 42 | // raise:format:arguments: |
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| 43 | II.push_back(Elt: &C.Idents.get(Name: "arguments" )); |
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| 44 | NSExceptionInstanceRaiseSelectors[1] = |
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| 45 | C.Selectors.getSelector(II.size(), &II[0]); |
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| 46 | } |
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| 47 | |
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| 48 | |
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| 49 | bool ObjCNoReturn::isImplicitNoReturn(const ObjCMessageExpr *ME) { |
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| 50 | Selector S = ME->getSelector(); |
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| 51 | |
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| 52 | if (ME->isInstanceMessage()) { |
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| 53 | // Check for the "raise" message. |
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| 54 | return S == RaiseSel; |
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| 55 | } |
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| 56 | |
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| 57 | if (const ObjCInterfaceDecl *ID = ME->getReceiverInterface()) { |
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| 58 | if (isSubclass(ID, NSExceptionII) && |
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| 59 | llvm::is_contained(NSExceptionInstanceRaiseSelectors, S)) |
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| 60 | return true; |
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| 61 | } |
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| 62 | |
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| 63 | return false; |
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| 64 | } |
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| 65 | |
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