UnsafeToAllowExceptionsCheck.cpp

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//===----------------------------------------------------------------------===//
//
// 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 "UnsafeToAllowExceptionsCheck.h"
#include "../utils/OptionsUtils.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
 
using namespace clang::ast_matchers;
 
namespace clang::tidy::bugprone {
namespace {
 
AST_MATCHER(FunctionDecl, isExplicitThrow) {
  return isExplicitThrowExceptionSpec(Node.getExceptionSpecType()) &&
         Node.getExceptionSpecSourceRange().isValid();
}
 
} // namespace
 
UnsafeToAllowExceptionsCheck::UnsafeToAllowExceptionsCheck(
    StringRef Name, ClangTidyContext *Context)
    : ClangTidyCheck(Name, Context),
      CheckedSwapFunctions(utils::options::parseStringList(
          Options.get("CheckedSwapFunctions", "swap;iter_swap;iter_move"))) {}
 
void UnsafeToAllowExceptionsCheck::storeOptions(
    ClangTidyOptions::OptionMap &Opts) {
  Options.store(Opts, "CheckedSwapFunctions",
                utils::options::serializeStringList(CheckedSwapFunctions));
}
 
void UnsafeToAllowExceptionsCheck::registerMatchers(MatchFinder *Finder) {
  Finder->addMatcher(
      functionDecl(isDefinition(), isExplicitThrow(),
                   anyOf(cxxDestructorDecl(),
                         cxxConstructorDecl(isMoveConstructor()),
                         cxxMethodDecl(isMoveAssignmentOperator()),
                         allOf(hasAnyName(CheckedSwapFunctions),
                               unless(parameterCountIs(0))),
                         isMain()))
          .bind("f"),
      this);
}
 
void UnsafeToAllowExceptionsCheck::check(
    const MatchFinder::MatchResult &Result) {
  const auto *MatchedDecl = Result.Nodes.getNodeAs<FunctionDecl>("f");
  assert(MatchedDecl);
 
  diag(MatchedDecl->getLocation(),
       "function %0 should not throw exceptions but "
       "it is still marked as potentially throwing")
      << MatchedDecl;
}
 
} // namespace clang::tidy::bugprone