[cfe-commits] r66628 - in /cfe/trunk: lib/Analysis/SimpleConstraintManager.cpp test/Analysis/misc-ps.m
Ted Kremenek
kremenek at apple.com
Tue Mar 10 19:29:48 PDT 2009
Author: kremenek
Date: Tue Mar 10 21:29:48 2009
New Revision: 66628
URL: http://llvm.org/viewvc/llvm-project?rev=66628&view=rev
Log:
SimpleConstraintManager doesn't reason about bitwise-constraints on symbolic
values. Indicating this in 'canReasonAbout' allows GRExprEngine to recover
path-sensitivity in some cases.
Modified:
cfe/trunk/lib/Analysis/SimpleConstraintManager.cpp
cfe/trunk/test/Analysis/misc-ps.m
Modified: cfe/trunk/lib/Analysis/SimpleConstraintManager.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Analysis/SimpleConstraintManager.cpp?rev=66628&r1=66627&r2=66628&view=diff
==============================================================================
--- cfe/trunk/lib/Analysis/SimpleConstraintManager.cpp (original)
+++ cfe/trunk/lib/Analysis/SimpleConstraintManager.cpp Tue Mar 10 21:29:48 2009
@@ -21,6 +21,19 @@
SimpleConstraintManager::~SimpleConstraintManager() {}
bool SimpleConstraintManager::canReasonAbout(SVal X) const {
+ if (nonloc::SymIntConstraintVal *Y = dyn_cast<nonloc::SymIntConstraintVal>(&X)) {
+ const SymIntConstraint& C = Y->getConstraint();
+ switch (C.getOpcode()) {
+ // We don't reason yet about bitwise-constraints on symbolic values.
+ case BinaryOperator::And:
+ case BinaryOperator::Or:
+ case BinaryOperator::Xor:
+ return false;
+ default:
+ return true;
+ }
+ }
+
return true;
}
Modified: cfe/trunk/test/Analysis/misc-ps.m
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Analysis/misc-ps.m?rev=66628&r1=66627&r2=66628&view=diff
==============================================================================
--- cfe/trunk/test/Analysis/misc-ps.m (original)
+++ cfe/trunk/test/Analysis/misc-ps.m Tue Mar 10 21:29:48 2009
@@ -165,3 +165,16 @@
}
@end
+// PR 3770
+char pr3770(int x) {
+ int y = x & 0x2;
+ char *p = 0;
+ if (y == 1)
+ p = "hello";
+
+ if (y == 1)
+ return p[0]; // no-warning
+
+ return 'a';
+}
+
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