build/clang-plugin/KnownLiveChecker.cpp

   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/. */
   4
   5 #include "KnownLiveChecker.h"
   6 #include "CustomMatchers.h"
   7
   8 void KnownLiveChecker::registerMatchers(MatchFinder *AstMatcher) {
   9   // Note that this cannot catch mutations after pass-by-reference, and thus no
  10   // error for cycle collection macros.
  11
  12   auto KnownLiveLHS = hasLHS(memberExpr(hasKnownLiveAnnotation()).bind("lhs"));
  13   auto ForGeneralFunctions = forFunction(
  14       functionDecl(unless(anyOf(cxxConstructorDecl(), cxxDestructorDecl())))
  15           .bind("func"));
  16
  17   auto Matcher =
  18       allOf(isAssignmentOperator(), KnownLiveLHS, ForGeneralFunctions);
  19
  20   AstMatcher->addMatcher(binaryOperator(Matcher), this);
  21   AstMatcher->addMatcher(cxxOperatorCallExpr(Matcher), this);
  22 }
  23
  24 void KnownLiveChecker::check(const MatchFinder::MatchResult &Result) {
  25   const char *Error = "MOZ_KNOWN_LIVE members can only be modified by "
  26                       "constructors and destructors";
  27
  28   if (const MemberExpr *Expr = Result.Nodes.getNodeAs<MemberExpr>("lhs")) {
  29     diag(Expr->getBeginLoc(), Error, DiagnosticIDs::Error);
  30   }
  31   if (const CXXOperatorCallExpr *Expr =
  32           Result.Nodes.getNodeAs<CXXOperatorCallExpr>("lhs")) {
  33     diag(Expr->getBeginLoc(), Error, DiagnosticIDs::Error);
  34   }
  35 }