[analyzer] Add a complexity bound on history tracking.

(Currently, this is only relevant for tainted data.)

llvm-svn: 156050

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/StaticAnalyzer/Core/SymbolManager.cpp b/clang/lib/StaticAnalyzer/Core/SymbolManager.cpp
index 5fee9afc08d..0bc192d6457 100644
--- a/clang/lib/StaticAnalyzer/Core/SymbolManager.cpp
+++ b/clang/lib/StaticAnalyzer/Core/SymbolManager.cpp
@@ -164,6 +164,13 @@ void SymExpr::symbol_iterator::expand() {
   llvm_unreachable("unhandled expansion case");
 }
 
+unsigned SymExpr::computeComplexity() const {
+  unsigned R = 0;
+  for (symbol_iterator I = symbol_begin(), E = symbol_end(); I != E; ++I)
+    R++;
+  return R;
+}
+
 const SymbolRegionValue*
 SymbolManager::getRegionValueSymbol(const TypedValueRegion* R) {
   llvm::FoldingSetNodeID profile;