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 
20 void AvoidThrowingObjCExceptionCheck::registerMatchers(MatchFinder *Finder) {
21   // this check should only be applied to ObjC sources.
22   if (!getLangOpts().ObjC)
23     return;
24 
25   Finder->addMatcher(objcThrowStmt().bind("throwStmt"), this);
26   Finder->addMatcher(
27       objcMessageExpr(anyOf(hasSelector("raise:format:"),
28                             hasSelector("raise:format:arguments:")),
29                       hasReceiverType(asString("NSException")))
30           .bind("raiseException"),
31       this);
32 }
33 
34 void AvoidThrowingObjCExceptionCheck::check(
35     const MatchFinder::MatchResult &Result) {
36   const auto *MatchedStmt =
37       Result.Nodes.getNodeAs<ObjCAtThrowStmt>("throwStmt");
38   const auto *MatchedExpr =
39       Result.Nodes.getNodeAs<ObjCMessageExpr>("raiseException");
40   auto SourceLoc = MatchedStmt == nullptr ? MatchedExpr->getSelectorStartLoc()
41                                           : MatchedStmt->getThrowLoc();
42   diag(SourceLoc,
43        "pass in NSError ** instead of throwing exception to indicate "
44        "Objective-C errors");
45 }
46 
47 }  // namespace objc
48 }  // namespace google
49 }  // namespace tidy
50 }  // namespace clang
51