public CIL_callvirt(string label, CILMethod theMethod)
: base(label)
{
this.theMethod = theMethod;
}
public CIL_ldftn(string label, CILMethod theMethod)
: base(label)
{
this.theMethod = theMethod;
}
CILMethod ParseMethod(CILClass parentclass, string str)
{
// TODO: Need cleanup and reparse using Scanner
List<string> argNames = new List<string>();
// count how much deep we are in a try block so that we
// dont confuse } of the try-s as } of the method
int try_counter = 0;
int catch_counter;
bool isStatic = false;
CILScanner scanner = new CILScanner(fin, str);
string st;
string methodName = null;
while(methodName == null)
{
st = scanner.NextToken();
if(st == "static")
isStatic = true;
if((st == "int32") || (st == "int64") || (st == "void") || (st == "float64") || (st == "bool"))
methodName = scanner.NextToken();
else if(st == "class")
{
st = scanner.NextToken();
methodName = scanner.NextToken();
}
}
// skips "("
st = scanner.NextToken();
string methodSig = "(";
int paramCount = 0;
while(true)
{
st = scanner.NextToken();
if(st == ")")
break;
if(st != ",")
{
if(st == "class")
{
paramCount++;
if(paramCount > 1)
methodSig += ",";
methodSig += scanner.NextToken();
}
else
{
paramCount++;
if(paramCount > 1)
methodSig += ",";
methodSig += st;
}
argNames.Add(scanner.NextToken());
}
}
methodSig += ")";
CILMethod themethod = parentclass.GetMethod(methodName, methodSig);
themethod.SetArgumentNames(argNames);
themethod.IsStatic = isStatic;
currentMethod = themethod;
// parse the method body
bool done = false;
str = GetNextLine(); // skips "{"
while(done == false)
{
str = GetNextLine();
string[] ss = str.Split(' ');
switch(ss[0])
{
case ".maxstack":
// TODO
// can optimize stack allocation
break;
case ".try":
// ignore exception handling
// increase the try counter so that we know next }
// is not end of the method
try_counter++;
GetNextLine(); // skip the { of the try block
break;
case "finally":
try_counter++;
GetNextLine(); // skip the { of the finally block
break;
case "catch":
// ignore the whole catch block, find } to stop
// first ignore the {, then count to find the end
GetNextLine();
catch_counter = 1;
while(true)
{
string sc = GetNextLine();
sc = sc.TrimStart();
if(sc.Length > 1)
{
if(sc[0] == '{')
catch_counter++;
else if(sc[0] == '}')
catch_counter--;
}
if(catch_counter == 0)
break;
}
break;
case ".locals":
bool endlocals = false;
while(endlocals == false)
{
if(str.IndexOf("(") >= 0)
str = str.Substring(str.IndexOf("(") + 1);
string s2;
if(str.IndexOf(",") >= 0)
s2 = str.Substring(0, str.IndexOf(","));
else if(str.IndexOf(")") >= 0)
{
s2 = str.Substring(0, str.IndexOf(")"));
endlocals = true;
}
else
{
Console.WriteLine("Unknown local variable declaration {0}", str);
throw new Exception("Unknown local variable declaration");
}
themethod.AddLocalVariable(ParseLocalVariable(s2));
if(endlocals == false)
str = GetNextLine();
}
break;
case "}":
if(try_counter == 0)
done = true;
else
try_counter--;
break;
case ".entrypoint":
program.EntryPoint = themethod;
break;
default:
string label = str.Substring(0, str.IndexOf(":"));
CILInstruction inst = ParseInstruction(label, str.Substring(10, str.Length - 10));
if(inst != null)
themethod.AddInstruction(inst);
break;
}
}
return themethod;
}
public CILMethod GetMethod(string methodName, string methodSig)
{
// TODO
// now methods are identified by name only
// must change to method signature soon
foreach(CILMethod method in methods)
if((method.Name == methodName) && (method.Sig == methodSig))
return method;
CILMethod ret = new CILMethod(this, methodName, methodSig);
methods.Add(ret);
return ret;
}