clang-tools-extra/clang-tidy/bugprone/ThrowKeywordMissingCheck.cpp

//===--- ThrowKeywordMissingCheck.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 "ThrowKeywordMissingCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"

using namespace clang::ast_matchers;

namespace clang {
namespace tidy {
namespace bugprone {

void ThrowKeywordMissingCheck::registerMatchers(MatchFinder *Finder) {
  if (!getLangOpts().CPlusPlus)
    return;

  auto CtorInitializerList =
      cxxConstructorDecl(hasAnyConstructorInitializer(anything()));

  Finder->addMatcher(
      expr(anyOf(cxxFunctionalCastExpr(), cxxBindTemporaryExpr(),
                 cxxTemporaryObjectExpr()),
           hasType(cxxRecordDecl(
               isSameOrDerivedFrom(matchesName("[Ee]xception|EXCEPTION")))),
           unless(anyOf(hasAncestor(stmt(
                            anyOf(cxxThrowExpr(), callExpr(), returnStmt()))),
                        hasAncestor(varDecl()),
                        allOf(hasAncestor(CtorInitializerList),
                              unless(hasAncestor(cxxCatchStmt()))))))
          .bind("temporary-exception-not-thrown"),
      this); 
}

void ThrowKeywordMissingCheck::check(const MatchFinder::MatchResult &Result) {
  const auto *TemporaryExpr =
      Result.Nodes.getNodeAs<Expr>("temporary-exception-not-thrown");

  diag(TemporaryExpr->getBeginLoc(), "suspicious exception object created but "
                                     "not thrown; did you mean 'throw %0'?")
      << TemporaryExpr->getType().getBaseTypeIdentifier()->getName();
}

} // namespace bugprone
} // namespace tidy
} // namespace clang