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//===--- AvoidThrowingObjCExceptionCheck.cpp - clang-tidy------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "AvoidThrowingObjCExceptionCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::google::objc {
void AvoidThrowingObjCExceptionCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(objcThrowStmt().bind("throwStmt"), this);
Finder->addMatcher(
objcMessageExpr(anyOf(hasSelector("raise:format:"),
hasSelector("raise:format:arguments:")),
hasReceiverType(asString("NSException")))
.bind("raiseException"),
this);
}
void AvoidThrowingObjCExceptionCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *MatchedStmt =
Result.Nodes.getNodeAs<ObjCAtThrowStmt>("throwStmt");
const auto *MatchedExpr =
Result.Nodes.getNodeAs<ObjCMessageExpr>("raiseException");
auto SourceLoc = MatchedStmt == nullptr ? MatchedExpr->getSelectorStartLoc()
: MatchedStmt->getThrowLoc();
// Early return on invalid locations.
if (SourceLoc.isInvalid())
return;
// If the match location was in a macro, check if the macro was in a system
// header.
if (SourceLoc.isMacroID()) {
SourceManager &SM = *Result.SourceManager;
auto MacroLoc = SM.getImmediateMacroCallerLoc(SourceLoc);
// Matches in system header macros should be ignored.
if (SM.isInSystemHeader(MacroLoc))
return;
}
diag(SourceLoc,
"pass in NSError ** instead of throwing exception to indicate "
"Objective-C errors");
}
} // namespace clang::tidy::google::objc
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