Importing netbsd clang -- pristine

Change-Id: Ia40e9ffdf29b5dab2f122f673ff6802a58bc690f

external/bsd/llvm/dist/clang/lib/StaticAnalyzer/Checkers/UndefinedArraySubscriptChecker.cpp

@@ -0,0 +1,64 @@
+//===--- UndefinedArraySubscriptChecker.h ----------------------*- C++ -*--===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This defines UndefinedArraySubscriptChecker, a builtin check in ExprEngine
+// that performs checks for undefined array subscripts.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ClangSACheckers.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
+#include "clang/StaticAnalyzer/Core/Checker.h"
+#include "clang/StaticAnalyzer/Core/CheckerManager.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
+
+using namespace clang;
+using namespace ento;
+
+namespace {
+class UndefinedArraySubscriptChecker
+  : public Checker< check::PreStmt<ArraySubscriptExpr> > {
+  mutable OwningPtr<BugType> BT;
+
+public:
+  void checkPreStmt(const ArraySubscriptExpr *A, CheckerContext &C) const;
+};
+} // end anonymous namespace
+
+void 
+UndefinedArraySubscriptChecker::checkPreStmt(const ArraySubscriptExpr *A,
+                                             CheckerContext &C) const {
+  const Expr *Index = A->getIdx();
+  if (!C.getSVal(Index).isUndef())
+    return;
+
+  // Sema generates anonymous array variables for copying array struct fields.
+  // Don't warn if we're in an implicitly-generated constructor.
+  const Decl *D = C.getLocationContext()->getDecl();
+  if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(D))
+    if (Ctor->isDefaulted())
+      return;
+
+  ExplodedNode *N = C.generateSink();
+  if (!N)
+    return;
+  if (!BT)
+    BT.reset(new BuiltinBug("Array subscript is undefined"));
+
+  // Generate a report for this bug.
+  BugReport *R = new BugReport(*BT, BT->getName(), N);
+  R->addRange(A->getIdx()->getSourceRange());
+  bugreporter::trackNullOrUndefValue(N, A->getIdx(), *R);
+  C.emitReport(R);
+}
+
+void ento::registerUndefinedArraySubscriptChecker(CheckerManager &mgr) {
+  mgr.registerChecker<UndefinedArraySubscriptChecker>();
+}