| 1 | //= ObjCNoReturn.cpp - Handling of Cocoa APIs known not to return --*- 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 implements special handling of recognizing ObjC API hooks that |
| 10 | // do not return but aren't marked as such in API headers. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "clang/AST/ASTContext.h" |
| 15 | #include "clang/AST/ExprObjC.h" |
| 16 | #include "clang/Analysis/DomainSpecific/ObjCNoReturn.h" |
| 17 | |
| 18 | using namespace clang; |
| 19 | |
| 20 | static bool isSubclass(const ObjCInterfaceDecl *Class, IdentifierInfo *II) { |
| 21 | if (!Class) |
| 22 | return false; |
| 23 | if (Class->getIdentifier() == II) |
| 24 | return true; |
| 25 | return isSubclass(Class->getSuperClass(), II); |
| 26 | } |
| 27 | |
| 28 | ObjCNoReturn::ObjCNoReturn(ASTContext &C) |
| 29 | : RaiseSel(GetNullarySelector("raise", C)), |
| 30 | NSExceptionII(&C.Idents.get("NSException")) |
| 31 | { |
| 32 | // Generate selectors. |
| 33 | SmallVector<IdentifierInfo*, 3> II; |
| 34 | |
| 35 | // raise:format: |
| 36 | II.push_back(&C.Idents.get("raise")); |
| 37 | II.push_back(&C.Idents.get("format")); |
| 38 | NSExceptionInstanceRaiseSelectors[0] = |
| 39 | C.Selectors.getSelector(II.size(), &II[0]); |
| 40 | |
| 41 | // raise:format:arguments: |
| 42 | II.push_back(&C.Idents.get("arguments")); |
| 43 | NSExceptionInstanceRaiseSelectors[1] = |
| 44 | C.Selectors.getSelector(II.size(), &II[0]); |
| 45 | } |
| 46 | |
| 47 | |
| 48 | bool ObjCNoReturn::isImplicitNoReturn(const ObjCMessageExpr *ME) { |
| 49 | Selector S = ME->getSelector(); |
| 50 | |
| 51 | if (ME->isInstanceMessage()) { |
| 52 | // Check for the "raise" message. |
| 53 | return S == RaiseSel; |
| 54 | } |
| 55 | |
| 56 | if (const ObjCInterfaceDecl *ID = ME->getReceiverInterface()) { |
| 57 | if (isSubclass(ID, NSExceptionII)) { |
| 58 | for (unsigned i = 0; i < NUM_RAISE_SELECTORS; ++i) { |
| 59 | if (S == NSExceptionInstanceRaiseSelectors[i]) |
| 60 | return true; |
| 61 | } |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | return false; |
| 66 | } |
| 67 |