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/*****
* program.cc
* Tom Prince
*
* The list of instructions used by the virtual machine.
*****/
#include <iostream>
#include "util.h"
#include "callable.h"
#include "program.h"
namespace vm {
static const char* opnames[] = {
"pop", "intpush", "constpush",
"varpush", "varsave", "fieldpush", "fieldsave",
"builtin", "jmp", "cjmp", "njmp", "call",
"pushclosure", "makefunc", "ret",
"alloc", "pushframe", "popframe"
};
static const Int numOps = (Int)(sizeof(opnames)/sizeof(char *));
#ifdef DEBUG_BLTIN
mem::map<bltin,string> bltinRegistry;
void registerBltin(bltin b, string s) {
bltinRegistry[b] = s;
}
string lookupBltin(bltin b) {
return bltinRegistry[b];
}
#endif
ostream& operator<< (ostream& out, const item& i)
{
// TODO: Make a data structure mapping typeids to print functions.
if (i.empty())
out << "empty";
else if (isdefault(i))
out << "default";
else if (i.type() == typeid(Int))
out << "Int, value = " << get<Int>(i);
else if (i.type() == typeid(double))
out << "real, value = " << get<double>(i);
else if (i.type() == typeid(string))
out << "string, value = " << get<string>(i);
else if (i.type() == typeid(callable))
out << *(get<callable *>(i));
else if (i.type() == typeid(frame)) {
out << "frame";
#ifdef DEBUG_FRAME
out << " " << (get<frame *>(i))->getName();
#endif
}
else
out << "type " << demangle(i.type().name());
return out;
}
void printInst(ostream& out, const program::label& code,
const program::label& base)
{
out.width(4);
out << offset(base,code) << " ";
Int i = (Int)code->op;
if (i < 0 || i >= numOps) {
out << "<<invalid op>> " << i;
}
out << opnames[i];
switch (code->op) {
case inst::intpush:
case inst::varpush:
case inst::varsave:
case inst::fieldpush:
case inst::fieldsave:
case inst::alloc:
{
out << " " << get<Int>(*code);
break;
}
case inst::constpush:
{
item c = code->ref;
out << " " << c;
break;
}
#ifdef DEBUG_BLTIN
case inst::builtin:
{
string s=lookupBltin(get<bltin>(*code));
out << " " << (!s.empty() ? s : "<unnamed>") << " ";
break;
}
#endif
case inst::jmp:
case inst::cjmp:
case inst::njmp:
{
char f = out.fill('0');
out << " i";
out.width(4);
out << offset(base,get<program::label>(*code));
out.fill(f);
break;
}
#ifdef DEBUG_FRAME
case inst::makefunc:
{
out << " " << get<lambda*>(*code)->name << " ";
break;
}
#endif
default: {
/* nothing else to do */
break;
}
};
}
void print(ostream& out, program *base)
{
program::label code = base->begin();
bool active = true;
while (active) {
if (code->op == inst::ret ||
code->op < 0 || code->op >= numOps)
active = false;
printInst(out, code, base->begin());
out << '\n';
++code;
}
}
} // namespace vm
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