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/*****
* callable.cc
* Tom Prince 2005/06/19
*
* Runtime representation of functions.
*****/
#include "stack.h"
#include "callable.h"
namespace vm {
callable::~callable()
{}
void func::call(stack *s)
{
s->run(this);
}
void nullfunc::print(ostream& out) {
out << "nullfunc";
}
bool func::compare(callable* F)
{
if (func* f=dynamic_cast<func*>(F))
return (body == f->body) && (closure == f->closure);
else return false;
}
void func::print(ostream& out) {
out << "func with lambda";
#ifdef DEBUG_FRAME
out << " " << body->name;
#endif
}
bool bfunc::compare(callable* F)
{
if (bfunc* f=dynamic_cast<bfunc*>(F))
return (func == f->func);
else return false;
}
void bfunc::print(ostream& out) {
out << "bltin";
#ifdef DEBUG_BLTIN
out << " " << lookupBltin(func);
#endif
}
void thunk::call(stack *s)
{
s->push(arg);
func->call(s);
}
void thunk::print(ostream& out) {
out << "thunk on " << arg << " with ";
func->print(out);
}
nullfunc nullfunc::func;
void nullfunc::call(stack *)
{
error("dereference of null function");
}
bool nullfunc::compare(callable* f)
{
return f == &func;
}
} // namespace vm
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