[analyzer] ConditionBRVisitor: Remove GDM checking

Summary: Removed the `GDM` checking what could prevent reports made by this visitor. Now we rely on constraint changes instead.

Reviewers: NoQ, george.karpenkov

Reviewed By: NoQ

Subscribers: jdoerfert, gerazo, xazax.hun, baloghadamsoftware, szepet, a.sidorin, mikhail.ramalho, Szelethus, donat.nagy, dkrupp

Tags: #clang

Differential Revision: https://reviews.llvm.org/D54811

llvm-svn: 356318

diff --git a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h
index 0a8712e..5b69299 100644 (file)
--- a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h
+++ b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h
@@ -79,6 +79,9 @@ public:
   ConstraintManager() = default;
   virtual ~ConstraintManager();
 
+  virtual bool haveEqualConstraints(ProgramStateRef S1,
+                                    ProgramStateRef S2) const = 0;
+
   virtual ProgramStateRef assume(ProgramStateRef state,
                                  DefinedSVal Cond,
                                  bool Assumption) = 0;

diff --git a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h
index 3b1c638..e5ff83e 100644 (file)
--- a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h
+++ b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h
@@ -588,11 +588,15 @@ public:
   ProgramStateRef getPersistentStateWithGDM(ProgramStateRef FromState,
                                            ProgramStateRef GDMState);
 
-  bool haveEqualEnvironments(ProgramStateRef S1, ProgramStateRef S2) {
+  bool haveEqualConstraints(ProgramStateRef S1, ProgramStateRef S2) const {
+    return ConstraintMgr->haveEqualConstraints(S1, S2);
+  }
+
+  bool haveEqualEnvironments(ProgramStateRef S1, ProgramStateRef S2) const {
     return S1->Env == S2->Env;
   }
 
-  bool haveEqualStores(ProgramStateRef S1, ProgramStateRef S2) {
+  bool haveEqualStores(ProgramStateRef S1, ProgramStateRef S2) const {
     return S1->store == S2->store;
   }
 

diff --git a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConstraintManager.h b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConstraintManager.h
index 72f3601..4baaf24 100644 (file)
--- a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConstraintManager.h
+++ b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConstraintManager.h
@@ -220,6 +220,11 @@ public:
     OS << nl;
   }
 
+  bool haveEqualConstraints(ProgramStateRef S1,
+                            ProgramStateRef S2) const override {
+    return S1->get<ConstraintSMT>() == S2->get<ConstraintSMT>();
+  }
+
   bool canReasonAbout(SVal X) const override {
     const TargetInfo &TI = getBasicVals().getContext().getTargetInfo();
 

diff --git a/clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp b/clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
index 49de53e..bf7d330 100644 (file)
--- a/clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
+++ b/clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
@@ -1816,13 +1816,10 @@ ConditionBRVisitor::VisitNodeImpl(const ExplodedNode *N,
                                   BugReporterContext &BRC, BugReport &BR) {
   ProgramPoint progPoint = N->getLocation();
   ProgramStateRef CurrentState = N->getState();
-  ProgramStateRef PrevState = N->getFirstPred()->getState();
+  ProgramStateRef PreviousState = N->getFirstPred()->getState();
 
-  // Compare the GDMs of the state, because that is where constraints
-  // are managed.  Note that ensure that we only look at nodes that
-  // were generated by the analyzer engine proper, not checkers.
-  if (CurrentState->getGDM().getRoot() ==
-      PrevState->getGDM().getRoot())
+  // If the constraint information does not changed there is no assumption.
+  if (BRC.getStateManager().haveEqualConstraints(CurrentState, PreviousState))
     return nullptr;
 
   // If an assumption was made on a branch, it should be caught

diff --git a/clang/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp b/clang/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
index 778f0f3..c6ebc85 100644 (file)
--- a/clang/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
+++ b/clang/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
@@ -230,6 +230,11 @@ public:
   // Implementation for interface from ConstraintManager.
   //===------------------------------------------------------------------===//
 
+  bool haveEqualConstraints(ProgramStateRef S1,
+                            ProgramStateRef S2) const override {
+    return S1->get<ConstraintRange>() == S2->get<ConstraintRange>();
+  }
+
   bool canReasonAbout(SVal X) const override;
 
   ConditionTruthVal checkNull(ProgramStateRef State, SymbolRef Sym) override;