1 files changed, 95 insertions, 0 deletions
diff --git a/clang/lib/StaticAnalyzer/Checkers/InvalidatedIteratorChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/InvalidatedIteratorChecker.cpp
new file mode 100644
index 00000000000..d1a9a7df071
--- /dev/null
+++ b/clang/lib/StaticAnalyzer/Checkers/InvalidatedIteratorChecker.cpp
@@ -0,0 +1,95 @@
+//===-- InvalidatedIteratorChecker.cpp ----------------------------*- C++ -*--//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines a checker for access of invalidated iterators.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
+#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
+#include "clang/StaticAnalyzer/Core/Checker.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
+
+
+#include "Iterator.h"
+
+using namespace clang;
+using namespace ento;
+using namespace iterator;
+
+namespace {
+
+class InvalidatedIteratorChecker
+  : public Checker<check::PreCall> {
+
+  std::unique_ptr<BugType> InvalidatedBugType;
+
+  void verifyAccess(CheckerContext &C, const SVal &Val) const;
+  void reportBug(const StringRef &Message, const SVal &Val,
+                 CheckerContext &C, ExplodedNode *ErrNode) const;
+public:
+  InvalidatedIteratorChecker();
+
+  void checkPreCall(const CallEvent &Call, CheckerContext &C) const;
+
+};
+
+} //namespace
+
+InvalidatedIteratorChecker::InvalidatedIteratorChecker() {
+  InvalidatedBugType.reset(
+      new BugType(this, "Iterator invalidated", "Misuse of STL APIs"));
+}
+
+void InvalidatedIteratorChecker::checkPreCall(const CallEvent &Call,
+                                              CheckerContext &C) const {
+  // Check for access of invalidated position
+  const auto *Func = dyn_cast_or_null<FunctionDecl>(Call.getDecl());
+  if (!Func)
+    return;
+
+  if (Func->isOverloadedOperator() &&
+      isAccessOperator(Func->getOverloadedOperator())) {
+    // Check for any kind of access of invalidated iterator positions
+    if (const auto *InstCall = dyn_cast<CXXInstanceCall>(&Call)) {
+      verifyAccess(C, InstCall->getCXXThisVal());
+    } else {
+      verifyAccess(C, Call.getArgSVal(0));
+    }
+  }
+}
+
+void InvalidatedIteratorChecker::verifyAccess(CheckerContext &C, const SVal &Val) const {
+  auto State = C.getState();
+  const auto *Pos = getIteratorPosition(State, Val);
+  if (Pos && !Pos->isValid()) {
+    auto *N = C.generateErrorNode(State);
+    if (!N) {
+      return;
+    }
+    reportBug("Invalidated iterator accessed.", Val, C, N);
+  }
+}
+
+void InvalidatedIteratorChecker::reportBug(const StringRef &Message,
+                                           const SVal &Val, CheckerContext &C,
+                                           ExplodedNode *ErrNode) const {
+  auto R = std::make_unique<PathSensitiveBugReport>(*InvalidatedBugType,
+                                                    Message, ErrNode);
+  R->markInteresting(Val);
+  C.emitReport(std::move(R));
+}
+
+void ento::registerInvalidatedIteratorChecker(CheckerManager &mgr) {
+  mgr.registerChecker<InvalidatedIteratorChecker>();
+}
+
+bool ento::shouldRegisterInvalidatedIteratorChecker(const LangOptions &LO) {
+  return true;
+}