clang-tools  6.0.0
AvoidThrowingObjCExceptionCheck.cpp
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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 
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