1 //===--- AvoidThrowingObjCExceptionCheck.cpp - clang-tidy------------------===//
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 #include "AvoidThrowingObjCExceptionCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12 
13 using namespace clang::ast_matchers;
14 
15 namespace clang {
16 namespace tidy {
17 namespace google {
18 namespace objc {
19 
registerMatchers(MatchFinder * Finder)20 void AvoidThrowingObjCExceptionCheck::registerMatchers(MatchFinder *Finder) {
21 
22   Finder->addMatcher(objcThrowStmt().bind("throwStmt"), this);
23   Finder->addMatcher(
24       objcMessageExpr(anyOf(hasSelector("raise:format:"),
25                             hasSelector("raise:format:arguments:")),
26                       hasReceiverType(asString("NSException")))
27           .bind("raiseException"),
28       this);
29 }
30 
check(const MatchFinder::MatchResult & Result)31 void AvoidThrowingObjCExceptionCheck::check(
32     const MatchFinder::MatchResult &Result) {
33   const auto *MatchedStmt =
34       Result.Nodes.getNodeAs<ObjCAtThrowStmt>("throwStmt");
35   const auto *MatchedExpr =
36       Result.Nodes.getNodeAs<ObjCMessageExpr>("raiseException");
37   auto SourceLoc = MatchedStmt == nullptr ? MatchedExpr->getSelectorStartLoc()
38                                           : MatchedStmt->getThrowLoc();
39   diag(SourceLoc,
40        "pass in NSError ** instead of throwing exception to indicate "
41        "Objective-C errors");
42 }
43 
44 }  // namespace objc
45 }  // namespace google
46 }  // namespace tidy
47 }  // namespace clang
48