build/clang-plugin/ExplicitOperatorBoolChecker.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "ExplicitOperatorBoolChecker.h"
   6 #include "CustomMatchers.h"
   7
   8 void ExplicitOperatorBoolChecker::registerMatchers(MatchFinder *AstMatcher) {
   9   AstMatcher->addMatcher(
  10       cxxMethodDecl(allOf(isFirstParty(), hasName("operator bool")))
  11           .bind("node"),
  12       this);
  13 }
  14
  15 void ExplicitOperatorBoolChecker::check(
  16     const MatchFinder::MatchResult &Result) {
  17   const CXXConversionDecl *Method =
  18       Result.Nodes.getNodeAs<CXXConversionDecl>("node");
  19   const CXXRecordDecl *Clazz = Method->getParent();
  20
  21   if (!Method->isExplicit() && !hasCustomAttribute<moz_implicit>(Method) &&
  22       !ASTIsInSystemHeader(Method->getASTContext(), *Method) &&
  23       isInterestingDeclForImplicitConversion(Method)) {
  24     diag(Method->getBeginLoc(), "bad implicit conversion operator for %0",
  25          DiagnosticIDs::Error)
  26         << Clazz;
  27     diag(Method->getBeginLoc(), "consider adding the explicit keyword to %0",
  28          DiagnosticIDs::Note)
  29         << "'operator bool'";
  30   }
  31 }