tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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NoAddRefReleaseOnReturnChecker.cpp (1381B)

      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 "NoAddRefReleaseOnReturnChecker.h"
      6 #include "CustomMatchers.h"
      7 
      8 void NoAddRefReleaseOnReturnChecker::registerMatchers(MatchFinder *AstMatcher) {
      9  // Look for all of the calls to AddRef() or Release()
     10  AstMatcher->addMatcher(
     11      memberExpr(isAddRefOrRelease(), hasParent(callExpr())).bind("member"),
     12      this);
     13 }
     14 
     15 void NoAddRefReleaseOnReturnChecker::check(
     16    const MatchFinder::MatchResult &Result) {
     17  const MemberExpr *Member = Result.Nodes.getNodeAs<MemberExpr>("member");
     18  const Expr *Base = IgnoreTrivials(Member->getBase());
     19 
     20  // Check if the call to AddRef() or Release() was made on the result of a call
     21  // to a MOZ_NO_ADDREF_RELEASE_ON_RETURN function or method.
     22  if (auto *Call = dyn_cast<CallExpr>(Base)) {
     23    if (auto *Callee = Call->getDirectCallee()) {
     24      if (hasCustomAttribute<moz_no_addref_release_on_return>(Callee)) {
     25        diag(Call->getBeginLoc(),
     26             "%1 must not be called on the return value of '%0' which is marked with MOZ_NO_ADDREF_RELEASE_ON_RETURN",
     27             DiagnosticIDs::Error)
     28            << Callee->getQualifiedNameAsString() << dyn_cast<CXXMethodDecl>(Member->getMemberDecl());
     29      }
     30    }
     31  }
     32 }