@Override
public void visit(AssignInstruction insn) {
AssignmentStatement stmt =
Statement.assign(
Expr.var(insn.getReceiver().getIndex()), Expr.var(insn.getAssignee().getIndex()));
stmt.getDebugNames().addAll(insn.getReceiver().getDebugNames());
stmt.setLocation(currentLocation);
statements.add(stmt);
}
@Override
public DfaInstructionState[] visitAssign(
AssignInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
DfaValue dfaSource = memState.pop();
DfaValue dfaDest = memState.pop();
if (dfaDest instanceof DfaVariableValue) {
DfaVariableValue var = (DfaVariableValue) dfaDest;
DfaValueFactory factory = runner.getFactory();
if (dfaSource instanceof DfaVariableValue
&& factory.getVarFactory().getAllQualifiedBy(var).contains(dfaSource)) {
Nullness nullability =
memState.isNotNull(dfaSource)
? Nullness.NOT_NULL
: ((DfaVariableValue) dfaSource).getInherentNullability();
dfaSource =
factory.createTypeValue(((DfaVariableValue) dfaSource).getVariableType(), nullability);
}
if (var.getInherentNullability() == Nullness.NOT_NULL) {
checkNotNullable(
memState,
dfaSource,
NullabilityProblem.assigningToNotNull,
instruction.getRExpression());
}
final PsiModifierListOwner psi = var.getPsiVariable();
if (!(psi instanceof PsiField) || !psi.hasModifierProperty(PsiModifier.VOLATILE)) {
memState.setVarValue(var, dfaSource);
}
} else if (dfaDest instanceof DfaTypeValue && ((DfaTypeValue) dfaDest).isNotNull()) {
checkNotNullable(
memState, dfaSource, NullabilityProblem.assigningToNotNull, instruction.getRExpression());
}
memState.push(dfaDest);
return nextInstruction(instruction, runner, memState);
}
