| 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::tidy::google::objc { |
| 16 | |
| 17 | void AvoidThrowingObjCExceptionCheck::registerMatchers(MatchFinder *Finder) { |
| 18 | |
| 19 | Finder->addMatcher(NodeMatch: objcThrowStmt().bind(ID: "throwStmt"), Action: this); |
| 20 | Finder->addMatcher( |
| 21 | NodeMatch: objcMessageExpr(anyOf(hasSelector(BaseName: "raise:format:"), |
| 22 | hasSelector(BaseName: "raise:format:arguments:")), |
| 23 | hasReceiverType(InnerMatcher: asString(Name: "NSException"))) |
| 24 | .bind(ID: "raiseException"), |
| 25 | Action: this); |
| 26 | } |
| 27 | |
| 28 | void AvoidThrowingObjCExceptionCheck::check( |
| 29 | const MatchFinder::MatchResult &Result) { |
| 30 | const auto *MatchedStmt = |
| 31 | Result.Nodes.getNodeAs<ObjCAtThrowStmt>(ID: "throwStmt"); |
| 32 | const auto *MatchedExpr = |
| 33 | Result.Nodes.getNodeAs<ObjCMessageExpr>(ID: "raiseException"); |
| 34 | auto SourceLoc = MatchedStmt == nullptr ? MatchedExpr->getSelectorStartLoc() |
| 35 | : MatchedStmt->getThrowLoc(); |
| 36 | |
| 37 | // Early return on invalid locations. |
| 38 | if (SourceLoc.isInvalid()) |
| 39 | return; |
| 40 | |
| 41 | // If the match location was in a macro, check if the macro was in a system |
| 42 | // header. |
| 43 | if (SourceLoc.isMacroID()) { |
| 44 | SourceManager &SM = *Result.SourceManager; |
| 45 | auto MacroLoc = SM.getImmediateMacroCallerLoc(Loc: SourceLoc); |
| 46 | |
| 47 | // Matches in system header macros should be ignored. |
| 48 | if (SM.isInSystemHeader(Loc: MacroLoc)) |
| 49 | return; |
| 50 | } |
| 51 | |
| 52 | diag(Loc: SourceLoc, |
| 53 | Description: "pass in NSError ** instead of throwing exception to indicate " |
| 54 | "Objective-C errors"); |
| 55 | } |
| 56 | |
| 57 | } // namespace clang::tidy::google::objc |
| 58 |