1 //===--- AvoidThrowingObjCExceptionCheck.cpp - clang-tidy------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "AvoidThrowingObjCExceptionCheck.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 
14 using namespace clang::ast_matchers;
15 
16 namespace clang {
17 namespace tidy {
18 namespace google {
19 namespace objc {
20 
21 void AvoidThrowingObjCExceptionCheck::registerMatchers(MatchFinder *Finder) {
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 
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