Added file that should have been in my previous commit.

llvm-svn: 46722

clang/Analysis/ValueState.cpp

@@ -0,0 +1,116 @@
+#include "ValueState.h"
+
+using namespace clang;
+
+RValue ValueStateManager::GetValue(const StateTy& St, const LValue& LV) {
+  switch (LV.getSubKind()) {
+    case LValueDeclKind: {
+      StateTy::TreeTy* T = St.SlimFind(cast<LValueDecl>(LV).getDecl()); 
+      return T ? T->getValue().second : InvalidValue();
+    }
+    default:
+      assert (false && "Invalid LValue.");
+      break;
+  }
+  
+  return InvalidValue();
+}
+
+RValue ValueStateManager::GetValue(const StateTy& St, Stmt* S) {
+  for (;;) {
+    switch (S->getStmtClass()) {
+        
+        // ParenExprs are no-ops.
+        
+      case Stmt::ParenExprClass:
+        S = cast<ParenExpr>(S)->getSubExpr();
+        continue;
+        
+        // DeclRefExprs can either evaluate to an LValue or a Non-LValue
+        // (assuming an implicit "load") depending on the context.  In this
+        // context we assume that we are retrieving the value contained
+        // within the referenced variables.
+        
+      case Stmt::DeclRefExprClass:
+        return GetValue(St, LValueDecl(cast<DeclRefExpr>(S)->getDecl()));
+        
+        // Integer literals evaluate to an RValue.  Simply retrieve the
+        // RValue for the literal.
+        
+      case Stmt::IntegerLiteralClass:
+        return NonLValue::GetValue(ValMgr, cast<IntegerLiteral>(S));
+        
+        // Casts where the source and target type are the same
+        // are no-ops.  We blast through these to get the descendant
+        // subexpression that has a value.
+        
+      case Stmt::ImplicitCastExprClass: {
+        ImplicitCastExpr* C = cast<ImplicitCastExpr>(S);
+        if (C->getType() == C->getSubExpr()->getType()) {
+          S = C->getSubExpr();
+          continue;
+        }
+        break;
+      }
+        
+      case Stmt::CastExprClass: {
+        CastExpr* C = cast<CastExpr>(S);
+        if (C->getType() == C->getSubExpr()->getType()) {
+          S = C->getSubExpr();
+          continue;
+        }
+        break;
+      }
+        
+        // Handle all other Stmt* using a lookup.
+        
+      default:
+        break;
+    };
+    
+    break;
+  }
+  
+  StateTy::TreeTy* T = St.SlimFind(S);
+  
+  return T ? T->getValue().second : InvalidValue();
+}
+
+LValue ValueStateManager::GetLValue(const StateTy& St, Stmt* S) {
+  
+  while (ParenExpr* P = dyn_cast<ParenExpr>(S))
+    S = P->getSubExpr();
+  
+  if (DeclRefExpr* DR = dyn_cast<DeclRefExpr>(S))
+    return LValueDecl(DR->getDecl());
+  
+  return cast<LValue>(GetValue(St, S));
+}
+
+
+ValueStateManager::StateTy 
+ValueStateManager::SetValue(StateTy St, Stmt* S, bool isBlkExpr,
+                            const RValue& V) {
+  
+  assert (S);
+  return V.isValid() ? Factory.Add(St, ValueKey(S, isBlkExpr), V) : St;
+}
+
+ValueStateManager::StateTy
+ValueStateManager::SetValue(StateTy St, const LValue& LV, const RValue& V) {
+  
+  switch (LV.getSubKind()) {
+    case LValueDeclKind:        
+      return V.isValid() ? Factory.Add(St, cast<LValueDecl>(LV).getDecl(), V)
+      : Factory.Remove(St, cast<LValueDecl>(LV).getDecl());
+      
+    default:
+      assert ("SetValue for given LValue type not yet implemented.");
+      return St;
+  }
+}
+
+ValueStateManager::StateTy ValueStateManager::Remove(StateTy St, ValueKey K) {
+  return Factory.Remove(St, K);
+}
+