public void VisitNode(MethodCall node)
{
Attributes a = new Attributes("MethodCall");
MethodCallTypeDescriptor MTD = new MethodCallTypeDescriptor();
ErrorTypeDescriptor ETD = new ErrorTypeDescriptor();
node.attrRef = a;
/* --------------- Type Check Qualified Name and extract data -----------------*/
// Get Name
String name = GetMethCallName(node);
/* ----------------------- Semantics Visit ArgList (if exists)--------------------------*/
// Go to ArgList
List <ArgList> argListChildren = Utilities.GetChildren(node, typeof(ArgList)).Cast <ArgList>().ToList();
// If Args exist...
if (argListChildren.Count > 0)
{
// Type check the argument Node
argListChildren[0].Accept(this);
// Record it in our type ref
MTD.argsRoot = argListChildren[0];
}
/* ------------ Configure Attributes ----------------*/
// Put the descriptor in the attributes structure
a.typeInfo = MTD;
/* --------- Configure Type Descriptor --------------*/
MTD.name = name;
Attributes attr = currentSymbolTable.lookup(name);
// If method exists in symbol table
if (attr != null)
{
MTD.returnType = attr.typeInfo.returnType;
MTD.nameSpaceVar = attr.typeInfo.nameSpaceVar;
a.typeInfo = MTD;
}
// Method not found in symbol table
else
{
a.typeInfo = ETD;
}
// Decorate AST with attrRef
node.attrRef = a;
}
protected void VisitNode(MethodCall node)
{
// deal with arguments first
// Arguments are in the arglist node's type descriptor.
// If arguments were provided
// We'll need one of these to understand what we're looking at
MethodCallTypeDescriptor mtd = null;
ArgListTypeDescriptor atd = null;
ArgList proposedArgs = null;
// "If the arg list for this has errors" is what we're trying to get at with this block
// If we aren't error type descriptor try to get the args root
if (Utilities.attrToType(node.attrRef) != "ErrorTypeDescriptor")
{
proposedArgs = node.attrRef.typeInfo.argsRoot;
// If arguments are invalid
if (proposedArgs != null && proposedArgs.attrRef.typeInfo.GetType() == typeof(ErrorTypeDescriptor))
{
Console.WriteLine("Error in code generator. ErrorTypeDescriptor encountered.");
}
// If arguments are valid
mtd = node.attrRef.typeInfo;
string paramResult = "";
if (proposedArgs != null)
{
atd = mtd.argsRoot.attrRef.typeInfo;
}
// Keep track of how many arguments we're loading onto the stack prior to a function call
if (atd != null)
{
foreach (var element in atd.Params)
{
if (Utilities.attrToType(element.attrRef).Contains("String"))
{
paramResult += "string";
// Overhead of pushing string to the stack
InsertIntoFile(String.Format("ldstr\t\t \"{0}\"\n", element.Name));
}
else if (Utilities.attrToType(element.attrRef).Contains("Integer"))
{
paramResult += "int32";
// If Identifier, use the number directly
if (element.NodeType.Name == "Identifier")
{
InsertIntoFile(String.Format("ldc.i4\t\t {0}\n", element.Name));
}
// If Qualified Name use variable name
else if (element.NodeType.Name == "QualifiedName")
{
int varNumber = 0;
// Either this is coming from function args (see here).
Dictionary <string, int> localArgs = new Dictionary <string, int>();
localArgNumber.TryGetValue(methodName, out localArgs);
if (localArgs.ContainsKey(element.Name))
{
varNumber = GetArgPosit(element.Name);
InsertIntoFile(String.Format("ldarg {0}\t\t //{1}\n", varNumber, element.Name));
}
else
{
varNumber = GetStackPosit(element.Name);
InsertIntoFile(String.Format("ldloc {0}\t\t //{1}\n", varNumber, element.Name));
}
// Or this is coming from function local vars (see here)
}
// If Expr, generate instructions to evaluate expr
else if (element.NodeType.Name == "Expr")
{
// Visit all expr nodes and have them generate the code. The other way to do this
// would be as defined in this comment block which I was told not to do in class
// (But works!)
/*
* Expr e = element as Expr;
* int expressionEval = e.eval();
* InsertIntoFile(String.Format("ldc.i4\t\t {0}\n", expressionEval));
*/
element.Accept(this);
}
}
else
{
paramResult += "DEFAULT uh oh";
}
}
}
// call method
String nameSpaceString = mtd.nameSpaceVar;
InsertIntoFile(String.Format("call {0} {1} :: {2}({3})\n", mtd.returnType.ToLower(),
mtd.nameSpaceVar, mtd.name, paramResult));
}
#if false // Get a type descriptor for this method dcl
MethodDclTypeDescp m = node.attrRef.typeInfo as MethodDclTypeDescp;
StringBuilder sb = new StringBuilder();
Byte[] info;
// Build modifier list
string modList = "";
foreach (string modifier in m.Modifiers)
{
modList += modifier + " ";
}
modList = modList.ToLower();
// Build parameter list
string theFunctArgs = "";
int numberOfParams = 0;
if (m.paramList != null)
{
foreach (string name in m.paramList.Names)
{
string entry = name + " " + m.paramList.Types;
if (numberOfParams++ > 0)
{
entry += ",";
}
theFunctArgs += entry + "\n";
}
}
sb.AppendLine(String.Format(".method {0}{1} \n {2} ({3}) cil managed", modList, m.returnType, m.Name, theFunctArgs));
info = new UTF8Encoding(true).GetBytes(sb.ToString());
TCCLParser.currentFileStream.Write(info, 0, info.Length);
InsertIntoFile("{\n");
if (m.Name.Contains("main") || m.Name.Contains("Main"))
{
InsertIntoFile(".entrypoint\n");
}
InsertIntoFile(".maxstack 1000\n"); // for now
// If field decls, do them here too
// Visit children
Utilities.CodeGenVisitAllChildren(node, this);
#endif
}