build/clang-plugin/NeedsNoVTableTypeChecker.cpp
author Dimi Lee <dlee@mozilla.com>
Sat, 08 Aug 2020 06:00:00 +0000
changeset 543991 fa0dbdf15f291e814b4854d515d7ef3e4548b7fb
parent 444370 538a16d495142178a73e0bdc30f100b43d2fd62b
permissions -rw-r--r--
Bug 1658010 - Add null pointer check before notifying content block event r=xeonchen Differential Revision: https://phabricator.services.mozilla.com/D86421

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "NeedsNoVTableTypeChecker.h"
#include "CustomMatchers.h"

void NeedsNoVTableTypeChecker::registerMatchers(MatchFinder *AstMatcher) {
  AstMatcher->addMatcher(
      classTemplateSpecializationDecl(
          allOf(hasAnyTemplateArgument(refersToType(hasVTable())),
                hasNeedsNoVTableTypeAttr()))
          .bind("node"),
      this);
}

void NeedsNoVTableTypeChecker::check(const MatchFinder::MatchResult &Result) {
  const ClassTemplateSpecializationDecl *Specialization =
      Result.Nodes.getNodeAs<ClassTemplateSpecializationDecl>("node");

  // Get the offending template argument
  QualType Offender;
  const TemplateArgumentList &Args =
      Specialization->getTemplateInstantiationArgs();
  for (unsigned i = 0; i < Args.size(); ++i) {
    Offender = Args[i].getAsType();
    if (typeHasVTable(Offender)) {
      break;
    }
  }

  diag(Specialization->getBeginLoc(),
       "%0 cannot be instantiated because %1 has a VTable",
       DiagnosticIDs::Error)
      << Specialization << Offender;
  diag(Specialization->getPointOfInstantiation(),
       "bad instantiation of %0 requested here", DiagnosticIDs::Note)
      << Specialization;
}