56 lines · cpp
1//===----------------------------------------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "AvoidThrowingObjCExceptionCheck.h"10#include "clang/ASTMatchers/ASTMatchFinder.h"11 12using namespace clang::ast_matchers;13 14namespace clang::tidy::google::objc {15 16void AvoidThrowingObjCExceptionCheck::registerMatchers(MatchFinder *Finder) {17 Finder->addMatcher(objcThrowStmt().bind("throwStmt"), this);18 Finder->addMatcher(19 objcMessageExpr(anyOf(hasSelector("raise:format:"),20 hasSelector("raise:format:arguments:")),21 hasReceiverType(asString("NSException")))22 .bind("raiseException"),23 this);24}25 26void AvoidThrowingObjCExceptionCheck::check(27 const MatchFinder::MatchResult &Result) {28 const auto *MatchedStmt =29 Result.Nodes.getNodeAs<ObjCAtThrowStmt>("throwStmt");30 const auto *MatchedExpr =31 Result.Nodes.getNodeAs<ObjCMessageExpr>("raiseException");32 auto SourceLoc = MatchedStmt == nullptr ? MatchedExpr->getSelectorStartLoc()33 : MatchedStmt->getThrowLoc();34 35 // Early return on invalid locations.36 if (SourceLoc.isInvalid())37 return;38 39 // If the match location was in a macro, check if the macro was in a system40 // header.41 if (SourceLoc.isMacroID()) {42 const SourceManager &SM = *Result.SourceManager;43 auto MacroLoc = SM.getImmediateMacroCallerLoc(SourceLoc);44 45 // Matches in system header macros should be ignored.46 if (SM.isInSystemHeader(MacroLoc))47 return;48 }49 50 diag(SourceLoc,51 "pass in NSError ** instead of throwing exception to indicate "52 "Objective-C errors");53}54 55} // namespace clang::tidy::google::objc56