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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 "KnownLiveChecker.h"
#include "CustomMatchers.h"
void KnownLiveChecker::registerMatchers(MatchFinder *AstMatcher) {
// Note that this cannot catch mutations after pass-by-reference, and thus no
// error for cycle collection macros.
auto KnownLiveLHS = hasLHS(memberExpr(hasKnownLiveAnnotation()).bind("lhs"));
auto ForGeneralFunctions = forFunction(
functionDecl(unless(anyOf(cxxConstructorDecl(), cxxDestructorDecl())))
auto Matcher =
allOf(isAssignmentOperator(), KnownLiveLHS, ForGeneralFunctions);
AstMatcher->addMatcher(binaryOperator(Matcher), this);
AstMatcher->addMatcher(cxxOperatorCallExpr(Matcher), this);
void KnownLiveChecker::check(const MatchFinder::MatchResult &Result) {
const char *Error = "MOZ_KNOWN_LIVE members can only be modified by "
"constructors and destructors";
if (const MemberExpr *Expr = Result.Nodes.getNodeAs<MemberExpr>("lhs")) {
diag(Expr->getBeginLoc(), Error, DiagnosticIDs::Error);
if (const CXXOperatorCallExpr *Expr =
Result.Nodes.getNodeAs<CXXOperatorCallExpr>("lhs")) {
diag(Expr->getBeginLoc(), Error, DiagnosticIDs::Error);