/** 11.1.2 assignment with right-hand-side identifier reference. */
@Override
public void visit(ReadVariableNode n, State state) {
String varname = n.getVariableName();
Value v;
if (varname.equals("this")) {
// 11.1.1 read 'this' from the execution context
v = state.readThis();
m.visitReadThis(n, v, state, InitialStateBuilder.GLOBAL);
} else { // ordinary variable
int result_base_reg = n.getResultBaseRegister();
Set<ObjectLabel> base_objs = null;
if (c.isScanning() || result_base_reg != AbstractNode.NO_VALUE) base_objs = newSet();
v = state.readVariable(varname, base_objs);
m.visitPropertyRead(n, base_objs, Value.makeTemporaryStr(varname), state, true);
m.visitVariableAsRead(n, v, state);
m.visitVariableOrProperty(varname, n.getSourceLocation(), v, state.getContext(), state);
m.visitReadNonThisVariable(n, v);
if (v.isMaybeAbsent()) Exceptions.throwReferenceError(state, c);
if (v.isNotPresent() && !Options.get().isPropagateDeadFlow()) {
state.setToNone();
return;
}
if (result_base_reg != AbstractNode.NO_VALUE)
state.writeRegister(result_base_reg, Value.makeObject(base_objs)); // see 10.1.4
m.visitRead(n, v, state);
m.visitReadVariable(n, v, state); // TODO: combine some of these m.visitXYZ methods?
}
if (v.isNotPresent() && !Options.get().isPropagateDeadFlow()) {
state.setToNone();
return;
}
if (n.getResultRegister() != AbstractNode.NO_VALUE)
state.writeRegister(n.getResultRegister(), v.restrictToNotAbsent());
}
/** 11.13 and 11.4.3 assignment with 'typeof' operator. */
@Override
public void visit(TypeofNode n, State state) {
Value v;
if (n.isVariable()) {
Value val =
state.readVariable(
n.getVariableName(),
null); // TODO: should also count as a variable read in Monitoring?
val = UnknownValueResolver.getRealValue(val, state);
v = Operators.typeof(val, val.isMaybeAbsent());
m.visitVariableOrProperty(
n.getVariableName(), n.getOperandSourceLocation(), val, state.getContext(), state);
} else {
Value val = state.readRegister(n.getArgRegister());
val = UnknownValueResolver.getRealValue(val, state);
v = Operators.typeof(val, false);
}
if (v.isNotPresent() && !Options.get().isPropagateDeadFlow()) {
state.setToNone();
return;
}
if (n.getResultRegister() != AbstractNode.NO_VALUE)
state.writeRegister(n.getResultRegister(), v);
}
