[cfe-commits] r127664 - /cfe/trunk/lib/Analysis/UninitializedValues.cpp

[Ted Kremenek]

Author: kremenek
Date: Mon Mar 14 23:57:29 2011
New Revision: 127664

URL: http://llvm.org/viewvc/llvm-project?rev=127664&view=rev
Log:
UninitializedValues: wrap BitVector references in a new class ValueVector.  No functionality change.  This defines the minimum interface that ValueVector needs to support when we no longer base it strictly on a direct interpretation of BitVector.

Modified:
    cfe/trunk/lib/Analysis/UninitializedValues.cpp

Modified: cfe/trunk/lib/Analysis/UninitializedValues.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Analysis/UninitializedValues.cpp?rev=127664&r1=127663&r2=127664&view=diff
==============================================================================
--- cfe/trunk/lib/Analysis/UninitializedValues.cpp (original)
+++ cfe/trunk/lib/Analysis/UninitializedValues.cpp Mon Mar 14 23:57:29 2011
@@ -74,7 +74,22 @@
 // CFGBlockValues: dataflow values for CFG blocks.
 //====------------------------------------------------------------------------//
 
-typedef llvm::BitVector ValueVector;
+static const bool Initialized = false;
+static const bool Uninitialized = true;
+
+class ValueVector {
+  llvm::BitVector vec;
+public:
+  ValueVector() {}
+  ValueVector(unsigned size) : vec(size) {}
+  typedef llvm::BitVector::reference reference;
+  void resize(unsigned n) { vec.resize(n); }
+  void merge(const ValueVector &rhs) { vec |= rhs.vec; }
+  bool operator!=(const ValueVector &rhs) const { return vec != rhs.vec; }
+  reference operator[](unsigned idx) { return vec[idx]; }
+  void reset() { vec.reset(); }
+};
+
 typedef std::pair<ValueVector *, ValueVector *> BVPair;
 
 namespace {
@@ -189,7 +204,7 @@
   if (isFirst)
     scratch = source;
   else
-    scratch |= source;  
+    scratch.merge(source);
 }
 #if 0
 static void printVector(const CFGBlock *block, ValueVector &bv,
@@ -286,9 +301,6 @@
 // Transfer function for uninitialized values analysis.
 //====------------------------------------------------------------------------//
 
-static const bool Initialized = false;
-static const bool Uninitialized = true;
-
 namespace {
 class FindVarResult {
   const VarDecl *vd;