From b1c91bfc45f46c1e01f8cbeca807da4bd08e0940 Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Fri, 18 Jul 2008 15:54:51 +0000
Subject: Fix regression by explicitly checking if we are negating a
 SymIntConstantVal.

llvm-svn: 53753
---
 clang/lib/Analysis/RValues.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'clang/lib/Analysis/RValues.cpp')

diff --git a/clang/lib/Analysis/RValues.cpp b/clang/lib/Analysis/RValues.cpp
index 60c349420a3..ed3dba925eb 100644
--- a/clang/lib/Analysis/RValues.cpp
+++ b/clang/lib/Analysis/RValues.cpp
@@ -54,6 +54,20 @@ RVal::symbol_iterator RVal::symbol_end() const {
   return X ? X+1 : NULL;
 }
 
+//===----------------------------------------------------------------------===//
+// Useful predicates.
+//===----------------------------------------------------------------------===//
+
+bool RVal::isZeroConstant() const {
+  if (isa<lval::ConcreteInt>(*this))
+    return cast<lval::ConcreteInt>(*this).getValue() == 0;
+  else if (isa<nonlval::ConcreteInt>(*this))
+    return cast<nonlval::ConcreteInt>(*this).getValue() == 0;
+  else
+    return false;
+}
+
+
 //===----------------------------------------------------------------------===//
 // Transfer function dispatch for Non-LVals.
 //===----------------------------------------------------------------------===//
-- 
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