1 files changed, 43 insertions, 0 deletions
diff --git a/gnu/llvm/clang/lib/StaticAnalyzer/Core/ConstraintManager.cpp b/gnu/llvm/clang/lib/StaticAnalyzer/Core/ConstraintManager.cpp
new file mode 100644
index 00000000000..d642c353026
--- /dev/null
+++ b/gnu/llvm/clang/lib/StaticAnalyzer/Core/ConstraintManager.cpp
@@ -0,0 +1,43 @@
+//===- ConstraintManager.cpp - Constraints on symbolic values. ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defined the interface to manage constraints on symbolic values.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h"
+#include "clang/AST/Type.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState_Fwd.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h"
+
+using namespace clang;
+using namespace ento;
+
+ConstraintManager::~ConstraintManager() = default;
+
+static DefinedSVal getLocFromSymbol(const ProgramStateRef &State,
+                                    SymbolRef Sym) {
+  const MemRegion *R =
+      State->getStateManager().getRegionManager().getSymbolicRegion(Sym);
+  return loc::MemRegionVal(R);
+}
+
+ConditionTruthVal ConstraintManager::checkNull(ProgramStateRef State,
+                                               SymbolRef Sym) {
+  QualType Ty = Sym->getType();
+  DefinedSVal V = Loc::isLocType(Ty) ? getLocFromSymbol(State, Sym)
+                                     : nonloc::SymbolVal(Sym);
+  const ProgramStatePair &P = assumeDual(State, V);
+  if (P.first && !P.second)
+    return ConditionTruthVal(false);
+  if (!P.first && P.second)
+    return ConditionTruthVal(true);
+  return {};
+}