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#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);
}
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