[PATCH] D105821: [analyzer] [WIP] Model destructor for std::unique_ptr

[Deep Majumder via Phabricator via cfe-commits]

RedDocMD created this revision.
RedDocMD added reviewers: NoQ, vsavchenko, xazax.hun, teemperor.
Herald added subscribers: manas, steakhal, ASDenysPetrov, martong, dkrupp, 
donat.nagy, Szelethus, mikhail.ramalho, a.sidorin, rnkovacs, szepet, 
baloghadamsoftware.
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This is probably a "throw-away" patch which attempts
to model automatic implicit destructor calls.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105821

Files:
  clang/include/clang/Analysis/ProgramPoint.h
  clang/lib/StaticAnalyzer/Checkers/SmartPtrModeling.cpp
  clang/lib/StaticAnalyzer/Core/CheckerManager.cpp
  clang/lib/StaticAnalyzer/Core/CoreEngine.cpp
  clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp


Index: clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
+++ clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
@@ -19,6 +19,7 @@
 #include "clang/StaticAnalyzer/Core/CheckerManager.h"
 #include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
 #include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
+#include "llvm/Support/raw_ostream.h"
 
 using namespace clang;
 using namespace ento;
@@ -757,6 +758,7 @@
   for (ExplodedNodeSet::iterator I = DstPreCall.begin(), E = DstPreCall.end();
        I != E; ++I)
     defaultEvalCall(Bldr, *I, *Call, CallOpts);
+  // getCheckerManager().runCheckersForEvalCall(DstInvalidated, DstPreCall, *Call, *this, CallOpts);
 
   getCheckerManager().runCheckersForPostCall(Dst, DstInvalidated,
                                              *Call, *this);
Index: clang/lib/StaticAnalyzer/Core/CoreEngine.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Core/CoreEngine.cpp
+++ clang/lib/StaticAnalyzer/Core/CoreEngine.cpp
@@ -181,6 +181,10 @@
       dispatchWorkItem(Pred, PNode->getLocation(), WU);
       break;
     }
+    case ProgramPoint::DestructorCallKind:
+      // Literally do nothing, since there is no real statement
+      // So there is nothing to be done.
+      break;
     default:
       assert(Loc.getAs<PostStmt>() ||
              Loc.getAs<PostInitializer>() ||
Index: clang/lib/StaticAnalyzer/Core/CheckerManager.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Core/CheckerManager.cpp
+++ clang/lib/StaticAnalyzer/Core/CheckerManager.cpp
@@ -664,14 +664,20 @@
     for (const auto &EvalCallChecker : EvalCallCheckers) {
       // TODO: Support the situation when the call doesn't correspond
       // to any Expr.
-      ProgramPoint L = ProgramPoint::getProgramPoint(
-          Call.getOriginExpr(), ProgramPoint::PostStmtKind,
+      llvm::Optional<ProgramPoint> LOpt;
+      const Expr *OriginExpr = Call.getOriginExpr();
+      if (OriginExpr) {
+        LOpt = ProgramPoint::getProgramPoint(
+          OriginExpr, ProgramPoint::PostStmtKind,
           Pred->getLocationContext(), EvalCallChecker.Checker);
+      } else {
+        LOpt = DestructorCallPoint(Pred->getLocationContext(), EvalCallChecker.Checker);
+      }
       bool evaluated = false;
       { // CheckerContext generates transitions(populates checkDest) on
         // destruction, so introduce the scope to make sure it gets properly
         // populated.
-        CheckerContext C(B, Eng, Pred, L);
+        CheckerContext C(B, Eng, Pred, *LOpt);
         evaluated = EvalCallChecker(Call, C);
       }
       assert(!(evaluated && anyEvaluated)
Index: clang/lib/StaticAnalyzer/Checkers/SmartPtrModeling.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/SmartPtrModeling.cpp
+++ clang/lib/StaticAnalyzer/Checkers/SmartPtrModeling.cpp
@@ -29,6 +29,7 @@
 #include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h"
 #include "clang/StaticAnalyzer/Core/PathSensitive/SymExpr.h"
 #include "clang/StaticAnalyzer/Core/PathSensitive/SymbolManager.h"
+#include "llvm/Support/raw_ostream.h"
 #include <string>
 
 using namespace clang;
@@ -177,7 +178,9 @@
 
 bool SmartPtrModeling::evalCall(const CallEvent &Call,
                                 CheckerContext &C) const {
+
   ProgramStateRef State = C.getState();
+  Call.dump();
   if (!smartptr::isStdSmartPtrCall(Call))
     return false;
 
@@ -261,6 +264,11 @@
     return true;
   }
 
+  if (const auto *DC = dyn_cast<CXXDestructorCall>(&Call)) {
+    llvm::errs() << "Wohoo\n";
+    return true;
+  }
+
   if (handleAssignOp(Call, C))
     return true;
 
Index: clang/include/clang/Analysis/ProgramPoint.h
===================================================================
--- clang/include/clang/Analysis/ProgramPoint.h
+++ clang/include/clang/Analysis/ProgramPoint.h
@@ -84,7 +84,8 @@
               MinImplicitCallKind = PreImplicitCallKind,
               MaxImplicitCallKind = PostImplicitCallKind,
               LoopExitKind,
-              EpsilonKind};
+              EpsilonKind,
+              DestructorCallKind};
 
 private:
   const void *Data1;
@@ -332,6 +333,12 @@
   }
 };
 
+class DestructorCallPoint : public ProgramPoint {
+public:
+  explicit DestructorCallPoint(const LocationContext *L, const ProgramPointTag *tag = nullptr)
+  : ProgramPoint(nullptr, DestructorCallKind, L, tag) {}
+};
+
 class FunctionExitPoint : public ProgramPoint {
 public:
   explicit FunctionExitPoint(const ReturnStmt *S,

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