public override int GenerateCode(int loc, IVirtualMachine vm, CheckerInformation info)
{
if (IsFuncCall)
{
if (info.ProcFuncs.ContainsIdent(Ident))
{
ASTProcFuncDecl callee = info.ProcFuncs[Ident];
if (!callee.IsFunc)
{
throw new IVirtualMachine.InternalError("Calls inside expresssions can only be made to functions but never to procedures!");
}
loc = ASTCmdCall.GenerateCallingCode(loc, vm, info, callee, OptInitOrExprList);
return(loc);
}
else
{
throw new IVirtualMachine.InternalError("Call to unkown function '" + Ident + "'");
}
}
else
{
loc = GenerateLValue(loc, vm, info, false);
vm.Deref(loc++);
return(loc);
}
}
public override int GenerateCode(int loc, IVirtualMachine vm, CheckerInformation info)
{
//Get abstract declaration
ASTProcFuncDecl callee = info.ProcFuncs[Ident];
loc = ASTCmdCall.GenerateCallingCode(loc, vm, info, callee, ExprList);
return(loc);
}
private void OptainNamespaceInformation(ASTProgram root, CheckerInformation info)
{
int globalAddress = 0;
//Add global parameters
foreach (ASTParam param in root.Params)
{
param.Address = globalAddress++;
info.Globals.addDeclaration(param);
}
//Add Global Variables, Functions and Procedures
//And add local variables and parameters of the Function and Procedures
foreach (ASTCpsDecl declaration in root.Declarations)
{
if (declaration is ASTStoDecl)
{
//Add global storage identifier
declaration.Address = globalAddress++;
info.Globals.addDeclaration((ASTStoDecl)declaration);
}
else if (declaration is ASTProcFuncDecl)
{
ASTProcFuncDecl procFunc = (ASTProcFuncDecl)declaration;
//Add function or procedure identifier
declaration.Address = -1;
info.ProcFuncs.addDeclaration(procFunc);
Namespace <IASTStoDecl> ns = new Namespace <IASTStoDecl>();
info.Namespaces.Add(declaration.Ident, ns);
//Relative address: The framepointer is one above the last parameter. Meaning the last parameter has the relative address -1 and the first -Params.Count
int paramAddress = -procFunc.Params.Count;
//Relative address: out copy, inout copy and local identifiers. Starting 3 addresses behind the frame pointer.
int localAddress = 3;
//Add local params of this function/procedure
foreach (ASTParam localParam in procFunc.Params)
{
if (localParam.OptMechmode == MechMode.COPY && (localParam.FlowMode == FlowMode.OUT || localParam.FlowMode == FlowMode.INOUT))
{
localParam.Address = localAddress++;
localParam.AddressLocation = paramAddress++;
}
else
{
localParam.Address = paramAddress++;
}
ns.addDeclaration(localParam);
}
//Add local storage identifier of this function/procedure
foreach (ASTCpsDecl localDeclaration in ((ASTProcFuncDecl)declaration).Declarations)
{
if (localDeclaration is ASTStoDecl)
{
localDeclaration.Address = localAddress++;
ns.addDeclaration((ASTStoDecl)localDeclaration);
}
}
}
}
}
public override Type GetExpressionType(CheckerInformation info)
{
if (IsFuncCall)
{
if (info.ProcFuncs.ContainsIdent(Ident))
{
ASTProcFuncDecl callee = info.ProcFuncs[Ident];
if (!callee.IsFunc)
{
throw new IVirtualMachine.InternalError("Calls inside expresssions can only be made to functions but never to procedures!");
}
var paramIttr = callee.Params.GetEnumerator();
if (!paramIttr.MoveNext())
{
throw new IVirtualMachine.InternalError("No return param found for function");
}
return(paramIttr.Current.Type);
}
else
{
throw new IVirtualMachine.InternalError("Call to unkown function '" + Ident + "'");
}
}
else
{
if (info.CurrentNamespace != null &&
info.Namespaces.ContainsKey(info.CurrentNamespace) &&
info.Namespaces[info.CurrentNamespace].ContainsIdent(Ident))
{
return(info.Namespaces[info.CurrentNamespace].GetIdent(Ident).Type);
}
if (info.Globals.ContainsIdent(Ident))
{
return(info.Globals.GetIdent(Ident).Type);
}
throw new IVirtualMachine.InternalError("Use of unkwon identifier '" + Ident + "'");
}
}
public int GenerateCode(int loc, IVirtualMachine vm, CheckerInformation info)
{
//Allocate global storage
vm.Alloc(loc++, info.Globals.Count);
//Load input params
foreach (ASTParam param in Params)
{
if (param.FlowMode == FlowMode.IN || param.FlowMode == FlowMode.INOUT)
{
//Load address where to save the input
vm.IntLoad(loc++, param.Address);
//Switch between types:
switch (param.Type)
{
case Type.INT32:
vm.IntInput(loc++, param.Ident);
break;
case Type.BOOL:
vm.BoolInput(loc++, param.Ident);
break;
case Type.DECIMAL:
vm.DecimalInput(loc++, param.Ident);
break;
}
}
}
//Generate main code
foreach (ASTCpsCmd cmd in Commands)
{
loc = cmd.GenerateCode(loc, vm, info);
}
//Add output code
foreach (ASTParam param in Params)
{
if (param.FlowMode == FlowMode.OUT || param.FlowMode == FlowMode.INOUT)
{
//Load output value
vm.IntLoad(loc++, param.Address);
vm.Deref(loc++);
//Switch between types:
switch (param.Type)
{
case Type.INT32:
vm.IntOutput(loc++, param.Ident);
break;
case Type.BOOL:
vm.BoolOutput(loc++, param.Ident);
break;
case Type.DECIMAL:
vm.DecimalOutput(loc++, param.Ident);
break;
}
}
}
//Add stop as last command
vm.Stop(loc++);
//Generate functions/procedures
foreach (string ident in info.ProcFuncs)
{
ASTProcFuncDecl procFunc = info.ProcFuncs[ident];
procFunc.Address = loc;
//Add calls, now that the function/procedure address is known
if (info.Calls.ContainsKey(ident) && info.Calls[ident] != null)
{
foreach (int callLoc in info.Calls[ident])
{
vm.Call(callLoc, procFunc.Address);
}
}
//Change current namespace
info.CurrentNamespace = ident;
//Generate code for function/procedure
loc = procFunc.GenerateCode(loc, vm, info);
//Reset namespace
info.CurrentNamespace = null;
}
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);
}