[analyzer] Reuse some code in simplifySVal().

No functional change intended.

Differential Revision: https://reviews.llvm.org/D49826

llvm-svn: 338422

Author: haoNoQ

clang/lib/StaticAnalyzer/Core/SimpleSValBuilder.cpp

@@ -1236,11 +1236,21 @@ SVal SimpleSValBuilder::simplifySVal(ProgramStateRef State, SVal V) {
       return Sym == Val.getAsSymbol();
     }
 
+    SVal cache(SymbolRef Sym, SVal V) {
+      Cached[Sym] = V;
+      return V;
+    }
+
+    SVal skip(SymbolRef Sym) {
+      return cache(Sym, SVB.makeSymbolVal(Sym));
+    }
+
   public:
     Simplifier(ProgramStateRef State)
         : State(State), SVB(State->getStateManager().getSValBuilder()) {}
 
     SVal VisitSymbolData(const SymbolData *S) {
+      // No cache here.
       if (const llvm::APSInt *I =
               SVB.getKnownValue(State, SVB.makeSymbolVal(S)))
         return Loc::isLocType(S->getType()) ? (SVal)SVB.makeIntLocVal(*I)
@@ -1257,11 +1267,9 @@ SVal SimpleSValBuilder::simplifySVal(ProgramStateRef State, SVal V) {
         return I->second;
 
       SVal LHS = Visit(S->getLHS());
-      if (isUnchanged(S->getLHS(), LHS)) {
-        SVal V = SVB.makeSymbolVal(S);
-        Cached[S] = V;
-        return V;
-      }
+      if (isUnchanged(S->getLHS(), LHS))
+        return skip(S);
+
       SVal RHS;
       // By looking at the APSInt in the right-hand side of S, we cannot
       // figure out if it should be treated as a Loc or as a NonLoc.
@@ -1281,9 +1289,8 @@ SVal SimpleSValBuilder::simplifySVal(ProgramStateRef State, SVal V) {
         RHS = SVB.makeIntVal(S->getRHS());
       }
 
-      SVal V = SVB.evalBinOp(State, S->getOpcode(), LHS, RHS, S->getType());
-      Cached[S] = V;
-      return V;
+      return cache(
+          S, SVB.evalBinOp(State, S->getOpcode(), LHS, RHS, S->getType()));
     }
 
     SVal VisitSymSymExpr(const SymSymExpr *S) {
@@ -1296,22 +1303,16 @@ SVal SimpleSValBuilder::simplifySVal(ProgramStateRef State, SVal V) {
       // and we don't know how to combine a LocAsInteger
       // with a concrete value.
       if (Loc::isLocType(S->getLHS()->getType()) !=
-          Loc::isLocType(S->getRHS()->getType())) {
-        SVal V = SVB.makeSymbolVal(S);
-        Cached[S] = V;
-        return V;
-      }
+          Loc::isLocType(S->getRHS()->getType()))
+        return skip(S);
 
       SVal LHS = Visit(S->getLHS());
       SVal RHS = Visit(S->getRHS());
-      if (isUnchanged(S->getLHS(), LHS) && isUnchanged(S->getRHS(), RHS)) {
-        SVal V = SVB.makeSymbolVal(S);
-        Cached[S] = V;
-        return V;
-      }
-      SVal V = SVB.evalBinOp(State, S->getOpcode(), LHS, RHS, S->getType());
-      Cached[S] = V;
-      return V;
+      if (isUnchanged(S->getLHS(), LHS) && isUnchanged(S->getRHS(), RHS))
+        return skip(S);
+
+      return cache(
+          S, SVB.evalBinOp(State, S->getOpcode(), LHS, RHS, S->getType()));
     }
 
     SVal VisitSymExpr(SymbolRef S) { return nonloc::SymbolVal(S); }