Bug 1814798 - pt 1. Add bool to enable/disable PHC at runtime r=glandium
[gecko.git] / build / clang-plugin / MustOverrideChecker.cpp
blobb19ae94aacdbbc309b5e5ed2de3cf6ac17139469
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/. */
5 #include "MustOverrideChecker.h"
6 #include "CustomMatchers.h"
8 void MustOverrideChecker::registerMatchers(MatchFinder *AstMatcher) {
9 AstMatcher->addMatcher(cxxRecordDecl(isDefinition()).bind("class"), this);
12 void MustOverrideChecker::registerPPCallbacks(CompilerInstance &CI) {
13 this->CI = &CI;
16 void MustOverrideChecker::check(const MatchFinder::MatchResult &Result) {
17 auto D = Result.Nodes.getNodeAs<CXXRecordDecl>("class");
19 // Look through all of our immediate bases to find methods that need to be
20 // overridden
21 typedef std::vector<CXXMethodDecl *> OverridesVector;
22 OverridesVector MustOverrides;
23 for (const auto &Base : D->bases()) {
24 // The base is either a class (CXXRecordDecl) or it's a templated class...
25 CXXRecordDecl *Parent = Base.getType()
26 .getDesugaredType(D->getASTContext())
27 ->getAsCXXRecordDecl();
28 // The parent might not be resolved to a type yet. In this case, we can't
29 // do any checking here. For complete correctness, we should visit
30 // template instantiations, but this case is likely to be rare, so we will
31 // ignore it until it becomes important.
32 if (!Parent) {
33 continue;
35 Parent = Parent->getDefinition();
36 for (const auto &M : Parent->methods()) {
37 if (hasCustomAttribute<moz_must_override>(M))
38 MustOverrides.push_back(M);
42 for (auto &O : MustOverrides) {
43 bool Overridden = false;
44 for (const auto &M : D->methods()) {
45 // The way that Clang checks if a method M overrides its parent method
46 // is if the method has the same name but would not overload.
47 if (getNameChecked(M) == getNameChecked(O) &&
48 !CI->getSema().IsOverload(M, O, false)) {
49 Overridden = true;
50 break;
53 if (!Overridden) {
54 diag(D->getLocation(), "%0 must override %1", DiagnosticIDs::Error)
55 << D->getDeclName() << O->getDeclName();
56 diag(O->getLocation(), "function to override is here",
57 DiagnosticIDs::Note);