From b6d5e15aae202f157c6cd63da8fa4b089e7b31e9 Mon Sep 17 00:00:00 2001
From: rdivacky <rdivacky@FreeBSD.org>
Date: Wed, 4 Nov 2009 15:04:32 +0000
Subject: Update clang to r86025.

---
 lib/Analysis/UndefinedAssignmentChecker.cpp | 61 +++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 lib/Analysis/UndefinedAssignmentChecker.cpp

(limited to 'lib/Analysis/UndefinedAssignmentChecker.cpp')

diff --git a/lib/Analysis/UndefinedAssignmentChecker.cpp b/lib/Analysis/UndefinedAssignmentChecker.cpp
new file mode 100644
index 0000000..c5b2401
--- /dev/null
+++ b/lib/Analysis/UndefinedAssignmentChecker.cpp
@@ -0,0 +1,61 @@
+//===--- UndefinedAssignmentChecker.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 UndefinedAssginmentChecker, a builtin check in GRExprEngine that
+// checks for assigning undefined values.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Analysis/PathSensitive/Checkers/UndefinedAssignmentChecker.h"
+#include "clang/Analysis/PathSensitive/BugReporter.h"
+
+using namespace clang;
+
+void *UndefinedAssignmentChecker::getTag() {
+  static int x = 0;
+  return &x;
+}
+
+void UndefinedAssignmentChecker::PreVisitBind(CheckerContext &C, 
+                                              const Stmt *S,
+                                              SVal location,
+                                              SVal val) {
+  if (!val.isUndef())
+    return;
+
+  ExplodedNode *N = C.GenerateNode(S, true);
+
+  if (!N)
+    return;
+
+  if (!BT)
+    BT = new BugType("Assigned value is garbage or undefined",
+                     "Logic error");
+
+  // Generate a report for this bug.
+  EnhancedBugReport *R = new EnhancedBugReport(*BT, BT->getName().c_str(), N);
+  const Expr *ex = 0;
+
+  // FIXME: This check needs to be done on the expression doing the
+  // assignment, not the "store" expression.
+  if (const BinaryOperator *B = dyn_cast<BinaryOperator>(S))
+    ex = B->getRHS();
+  else if (const DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
+    const VarDecl* VD = dyn_cast<VarDecl>(DS->getSingleDecl());
+    ex = VD->getInit();
+  }
+
+  if (ex) {
+    R->addRange(ex->getSourceRange());
+    R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, ex);
+  }
+
+  C.EmitReport(R);
+}  
+
-- 
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