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-rw-r--r--build/clang-plugin/KnownLiveChecker.cpp35
1 files changed, 35 insertions, 0 deletions
diff --git a/build/clang-plugin/KnownLiveChecker.cpp b/build/clang-plugin/KnownLiveChecker.cpp
new file mode 100644
index 0000000000..be0c3739ec
--- /dev/null
+++ b/build/clang-plugin/KnownLiveChecker.cpp
@@ -0,0 +1,35 @@
+/* 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 "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())))
+ .bind("func"));
+
+ 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);
+ }
+}