[analyzer] Show path diagnostic for C++ initializers

Also had to modify the PostInitializer ProgramLocation to contain the field region.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178826 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 17 insertions, 2 deletions

diff --git a/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp b/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
index c3bbc3baf6..f600362da9 100644
--- a/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
+++ b/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
@@ -435,6 +435,16 @@ PathDiagnosticPiece *FindLastStoreBRVisitor::VisitNode(const ExplodedNode *Succ,
     }
   }
 
+  // If this is a post initializer expression, initializing the region, we
+  // should track the initializer expression.
+  if (Optional<PostInitializer> PIP = Pred->getLocationAs<PostInitializer>()) {
+    const MemRegion *FieldReg = (const MemRegion *)PIP->getLocationValue();
+    if (FieldReg && FieldReg == R) {
+      StoreSite = Pred;
+      InitE = PIP->getInitializer()->getInit();
+    }
+  }
+  
   // Otherwise, see if this is the store site:
   // (1) Succ has this binding and Pred does not, i.e. this is
   //     where the binding first occurred.
diff --git a/lib/StaticAnalyzer/Core/ExprEngine.cpp b/lib/StaticAnalyzer/Core/ExprEngine.cpp
index 5746bfb724..ab4dbd7525 100644
--- a/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ b/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -438,8 +438,8 @@ void ExprEngine::ProcessInitializer(const CFGInitializer Init,
   ProgramStateRef State = Pred->getState();
   SVal thisVal = State->getSVal(svalBuilder.getCXXThis(decl, stackFrame));
 
-  PostInitializer PP(BMI, stackFrame);
   ExplodedNodeSet Tmp(Pred);
+  SVal FieldLoc;
 
   // Evaluate the initializer, if necessary
   if (BMI->isAnyMemberInitializer()) {
@@ -448,7 +448,6 @@ void ExprEngine::ProcessInitializer(const CFGInitializer Init,
     const Expr *Init = BMI->getInit()->IgnoreImplicit();
     if (!isa<CXXConstructExpr>(Init)) {
       const ValueDecl *Field;
-      SVal FieldLoc;
       if (BMI->isIndirectMemberInitializer()) {
         Field = BMI->getIndirectMember();
         FieldLoc = State->getLValue(BMI->getIndirectMember(), thisVal);
@@ -483,6 +482,8 @@ void ExprEngine::ProcessInitializer(const CFGInitializer Init,
       assert(Tmp.size() == 1 && "have not generated any new nodes yet");
       assert(*Tmp.begin() == Pred && "have not generated any new nodes yet");
       Tmp.clear();
+      
+      PostInitializer PP(BMI, FieldLoc.getAsRegion(), stackFrame);
       evalBind(Tmp, Init, Pred, FieldLoc, InitVal, /*isInit=*/true, &PP);
     }
   } else {
@@ -492,6 +493,7 @@ void ExprEngine::ProcessInitializer(const CFGInitializer Init,
 
   // Construct PostInitializer nodes whether the state changed or not,
   // so that the diagnostics don't get confused.
+  PostInitializer PP(BMI, FieldLoc.getAsRegion(), stackFrame);
   ExplodedNodeSet Dst;
   NodeBuilder Bldr(Tmp, Dst, *currBldrCtx);
   for (ExplodedNodeSet::iterator I = Tmp.begin(), E = Tmp.end(); I != E; ++I) {
diff --git a/lib/StaticAnalyzer/Core/PathDiagnostic.cpp b/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
index 686540b60e..7c0fb14a5c 100644
--- a/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
+++ b/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
@@ -588,6 +588,9 @@ PathDiagnosticLocation
     S = SP->getStmt();
     if (P.getAs<PostStmtPurgeDeadSymbols>())
       return PathDiagnosticLocation::createEnd(S, SMng, P.getLocationContext());
+  } else if (Optional<PostInitializer> PIP = P.getAs<PostInitializer>()) {
+    return PathDiagnosticLocation(PIP->getInitializer()->getSourceLocation(),
+                                  SMng);
   } else if (Optional<PostImplicitCall> PIE = P.getAs<PostImplicitCall>()) {
     return PathDiagnosticLocation(PIE->getLocation(), SMng);
   } else if (Optional<CallEnter> CE = P.getAs<CallEnter>()) {