[StaticAnalyzer] Added a getLValue method to ProgramState for bases

[Szelethus]

Summary

Also, this is a dependency to D45532.

[NoQ]

Looks good, thanks! Yeah, seems that these were accidentally omitted.

You may want to add the const CXXRecordDecl * variant as well.

[NoQ]

include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h

732

I think you wanted to say const auto * here. It's not really important that the local variable is const, but that the pointer points to const.

[Szelethus]

Added a CXXRecordDecl version.

[Szelethus]

Fixed a typo.

[Szelethus]

Thanks for the review!

If you like the new overload, can you please commit this for me?

include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h

invalidateRegions(ArrayRef<SVal> Regions, const Expr *E,
                     const CallEvent *Call = nullptr,
                     RegionAndSymbolInvalidationTraits *ITraits = nullptr) const;
 
   /// enterStackFrame - Returns the state for entry to the given stack frame,
   ///  preserving the current state.
   ProgramStateRef enterStackFrame(const CallEvent &Call,
                                   const StackFrameContext *CalleeCtx) const;
 
+  /// Get the lvalue for a base class object reference.
+  Loc getLValue(const CXXBaseSpecifier &BaseSpec, const SubRegion *Super) const;
+
   /// Get the lvalue for a variable reference.
   Loc getLValue(const VarDecl *D, const LocationContext *LC) const;
 
   Loc getLValue(const CompoundLiteralExpr *literal,
                 const LocationContext *LC) const;
 
   /// Get the lvalue for an ivar reference.
   SVal getLValue(const ObjCIvarDecl *decl, SVal base) const;

 }
 
 inline ProgramStateRef ProgramState::bindLoc(SVal LV, SVal V, const LocationContext *LCtx) const {
   if (Optional<Loc> L = LV.getAs<Loc>())
     return bindLoc(*L, V, LCtx);
   return this;
 }
 
+inline Loc ProgramState::getLValue(const CXXBaseSpecifier &BaseSpec,
+                                   const SubRegion *Super) const {
+  const auto Base = BaseSpec.getType()->getAsCXXRecordDecl();
+  return loc::MemRegionVal(
+      getStateManager().getRegionManager().getCXXBaseObjectRegion(
+                                            Base, Super, BaseSpec.isVirtual()));
+}
+
 inline Loc ProgramState::getLValue(const VarDecl *VD,
                                const LocationContext *LC) const {
   return getStateManager().StoreMgr->getLValueVar(VD, LC);
 }
 
 inline Loc ProgramState::getLValue(const CompoundLiteralExpr *literal,
                                const LocationContext *LC) const {
   return getStateManager().StoreMgr->getLValueCompoundLiteral(literal, LC);