From 0b57cec536236d46e3dba9bd041533462f33dbb7 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Fri, 20 Dec 2019 19:53:05 +0000
Subject: Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo".  That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.
---
 .../Checkers/UndefinedArraySubscriptChecker.cpp    | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/UndefinedArraySubscriptChecker.cpp

(limited to 'contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/UndefinedArraySubscriptChecker.cpp')

diff --git a/contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/UndefinedArraySubscriptChecker.cpp b/contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/UndefinedArraySubscriptChecker.cpp
new file mode 100644
index 000000000000..4c517d6f0562
--- /dev/null
+++ b/contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/UndefinedArraySubscriptChecker.cpp
@@ -0,0 +1,67 @@
+//===--- UndefinedArraySubscriptChecker.h ----------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This defines UndefinedArraySubscriptChecker, a builtin check in ExprEngine
+// that performs checks for undefined array subscripts.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.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 std::unique_ptr<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.generateErrorNode();
+  if (!N)
+    return;
+  if (!BT)
+    BT.reset(new BuiltinBug(this, "Array subscript is undefined"));
+
+  // Generate a report for this bug.
+  auto R = llvm::make_unique<BugReport>(*BT, BT->getName(), N);
+  R->addRange(A->getIdx()->getSourceRange());
+  bugreporter::trackExpressionValue(N, A->getIdx(), *R);
+  C.emitReport(std::move(R));
+}
+
+void ento::registerUndefinedArraySubscriptChecker(CheckerManager &mgr) {
+  mgr.registerChecker<UndefinedArraySubscriptChecker>();
+}
+
+bool ento::shouldRegisterUndefinedArraySubscriptChecker(const LangOptions &LO) {
+  return true;
+}
-- 
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