private void CheckForUndeclaredIdent(ASTProgram root, CheckerInformation info)
{
UsedIdents usedIdents = new UsedIdents(info);
root.GetUsedIdents(usedIdents);
info.CurrentNamespace = null;
//Check to see if each local outflow parameter was initialized
foreach (string ident in info.ProcFuncs)
{
foreach (ASTParam param in info.ProcFuncs[ident].Params)
{
if (param.FlowMode == FlowMode.OUT && (!usedIdents.LocalInitialized.ContainsKey(ident) || !usedIdents.LocalInitialized[ident].Contains(param.Ident)))
{
throw new CheckerException("The outflow parameter '" + param.Ident + "' of the procedure/function '" + ident + "' was not initialized");
}
}
}
//Check if each global outflow parameter was initialized
foreach (string global in info.Globals)
{
if (info.Globals[global] is ASTParam)
{
ASTParam param = (ASTParam)info.Globals[global];
if (param.FlowMode == FlowMode.OUT && !usedIdents.GlobalInitialized.Contains(param.Ident))
{
throw new CheckerException("The global outflow parameter '" + param.Ident + "' of the program was not initialized");
}
}
}
}
public override int GenerateCode(int loc, IVirtualMachine vm, CheckerInformation info)
{
int copies = 0;
foreach (ASTParam param in Params)
{
if (param.OptMechmode == MechMode.COPY && (param.FlowMode == FlowMode.INOUT || param.FlowMode == FlowMode.OUT))
{
++copies;
}
}
vm.Enter(loc++, copies + Declarations.Count, 0);
//CopyIn of inout copy parameters
foreach (ASTParam param in Params)
{
if (param.OptMechmode == MechMode.COPY && param.FlowMode == FlowMode.INOUT)
{
vm.CopyIn(loc++, param.AddressLocation.Value, param.Address);
}
}
//Generate body
foreach (ASTCpsCmd cmd in Commands)
{
loc = cmd.GenerateCode(loc, vm, info);
}
//CopyOut of inout copy and out copy parameters
bool omit = IsFunc;
foreach (ASTParam param in Params)
{
if (omit)
{
omit = false;
}
else
{
if (param.OptMechmode == MechMode.COPY && (param.FlowMode == FlowMode.INOUT || param.FlowMode == FlowMode.OUT))
{
vm.CopyOut(loc++, param.Address, param.AddressLocation.Value);
}
}
}
if (IsFunc)
{
//CopyOut return value
//Can't use standard CopyOut, becuase it works with absolute target address and not with top of stack as needed!
var paramIttr = Params.GetEnumerator(); paramIttr.MoveNext();
ASTParam result = paramIttr.Current;
vm.LoadRel(loc++, result.Address);
vm.Deref(loc++);
vm.LoadRel(loc++, result.AddressLocation.Value);
vm.Store(loc++);
}
//Return
vm.Return(loc++, Params.Count - (IsFunc ? 1 : 0)); //For function the return size is one smaller, leaving the function expression result on the stack!
return(loc);
}
public static int GenerateCallingCode(int loc, IVirtualMachine vm, CheckerInformation info, ASTProcFuncDecl callee, List <ASTExpression> exprList)
{
//Allocate Return Location on Stack
if (callee.IsFunc)
{
vm.Alloc(loc++, 1);
}
//Evaluate argument expressions
var paramIttr = callee.Params.GetEnumerator();
//Omit return param for functions
if (callee.IsFunc)
{
if (!paramIttr.MoveNext())
{
throw new IVirtualMachine.InternalError("No return param found for function");
}
}
foreach (ASTExpression expr in exprList)
{
if (!paramIttr.MoveNext())
{
throw new IVirtualMachine.InternalError("Too many arguments");
}
ASTParam param = paramIttr.Current;
if (param.OptMechmode != MechMode.COPY || (param.FlowMode == FlowMode.OUT || param.FlowMode == FlowMode.INOUT))
{
bool modifiable = param.OptChangemode == ChangeMode.VAR;
loc = expr.GenerateLValue(loc, vm, info, modifiable); //Load address on the stack
}
else
{
loc = expr.GenerateCode(loc, vm, info); //Load value on the stack
}
}
if (paramIttr.MoveNext())
{
throw new IVirtualMachine.InternalError("Too few arguments");
}
//Address of the function is not known.
//So it has to be stored that at this loc should be a call to the function/procedure.
if (callee.Address >= 0)
{
vm.Call(loc, callee.Address);
}
else
{
if (!info.Calls.ContainsKey(callee.Ident))
{
info.Calls.Add(callee.Ident, new List <int>());
}
info.Calls[callee.Ident].Add(loc);
}
++loc;
return(loc);
}
private void AssertNotConstant(ASTParam sto)
{
if (sto.OptChangemode == null || sto.OptChangemode.Value != ChangeMode.VAR)
{
if (!IsInit)
{
throw new CheckerException("Can't modify constant parameter '" + Ident + "'");
}
} //Default Changemode is const!
if (sto.FlowMode == FlowMode.IN && sto.OptMechmode != MechMode.COPY)
{
throw new CheckerException("Can't modify 'in ref' parameter '" + Ident + "'");
}
}