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/* 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 */
#include "MustOverrideChecker.h"
#include "CustomMatchers.h"
void MustOverrideChecker::registerMatchers(MatchFinder *AstMatcher) {
AstMatcher->addMatcher(cxxRecordDecl(isDefinition()).bind("class"), this);
void MustOverrideChecker::registerPPCallbacks(CompilerInstance &CI) {
this->CI = &CI;
void MustOverrideChecker::check(const MatchFinder::MatchResult &Result) {
auto D = Result.Nodes.getNodeAs<CXXRecordDecl>("class");
// Look through all of our immediate bases to find methods that need to be
// overridden
typedef std::vector<CXXMethodDecl *> OverridesVector;
OverridesVector MustOverrides;
for (const auto &Base : D->bases()) {
// The base is either a class (CXXRecordDecl) or it's a templated class...
CXXRecordDecl *Parent = Base.getType()
// The parent might not be resolved to a type yet. In this case, we can't
// do any checking here. For complete correctness, we should visit
// template instantiations, but this case is likely to be rare, so we will
// ignore it until it becomes important.
if (!Parent) {
Parent = Parent->getDefinition();
for (const auto &M : Parent->methods()) {
if (hasCustomAttribute<moz_must_override>(M))
for (auto &O : MustOverrides) {
bool Overridden = false;
for (const auto &M : D->methods()) {
// The way that Clang checks if a method M overrides its parent method
// is if the method has the same name but would not overload.
if (getNameChecked(M) == getNameChecked(O) &&
!CI->getSema().IsOverload(M, O, false)) {
Overridden = true;
if (!Overridden) {
diag(D->getLocation(), "%0 must override %1", DiagnosticIDs::Error)
<< D->getDeclName() << O->getDeclName();
diag(O->getLocation(), "function to override is here",