//
// This file is part of the Jlisp implementation of Standard Lisp
// Copyright \u00a9 (C) Codemist Ltd, 1998-2000.
//
import java.io.*;
public class FnWithEnv extends LispFunction
{
int nargs; // integer field saved in image file
byte [] bytecodes; // can be null if not needed (never shared?)
public LispObject [] env; // vector of lisp objects, eg literals
FnWithEnv()
{
env = new LispObject[0];
bytecodes = null;
nargs = 0;
}
FnWithEnv(LispObject [] env)
{
this.env = env;
bytecodes = null;
nargs = 0;
}
void scan()
{
if (Jlisp.objects.contains(this)) // seen before?
{ if (!Jlisp.repeatedObjects.containsKey(this))
{ Jlisp.repeatedObjects.put(
this,
Jlisp.nil); // value is junk at this stage
}
}
else Jlisp.objects.add(this);
for (int i=0; i<env.length; i++)
Jlisp.stack.push(env[i]);
}
void dump() throws IOException
{
Object w = Jlisp.repeatedObjects.get(this);
if (w != null &&
w instanceof Integer) putSharedRef(w); // processed before
else
{ if (w != null) // will be used again sometime
{ Jlisp.repeatedObjects.put(
this,
new Integer(Jlisp.sharedIndex++));
Jlisp.odump.write(X_STORE);
}
int length;
if (bytecodes == null) length = 0;
else length = bytecodes.length;
putPrefix(length, X_BPS);
int n = nargs;
// nargs can be up to 22 bits, ie 0x003fffff (7+7+8 bits)
if (n <= 0x7f) Jlisp.odump.write(n);
else
{ Jlisp.odump.write(n | 0x80);
n = n >> 7;
if (n <= 0x7f) Jlisp.odump.write(n);
else
{ Jlisp.odump.write(n | 0x80);
Jlisp.odump.write(n >> 7);
}
}
for (int i=0; i<length; i++)
Jlisp.odump.write(bytecodes[i]);
length = env.length;
putPrefix(length, X_VEC); // context after BPS decodes this case!
for (int i=0; i<length; i++)
Jlisp.stack.push(env[i]);
}
}
}
// End of FnWithEnv.java