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/*****
* inst.h
* Andy Hammerlindl 2002/06/27
*
* Descibes the items and instructions that are used by the virtual machine.
*****/
#ifndef INST_H
#define INST_H
#include <iterator>
#include <iostream>
#include "errormsg.h"
#include "item.h"
#include "vm.h"
namespace vm {
// Forward declarations
struct inst; class stack; class program;
// A function "lambda," that is, the code that runs a function.
// It also needs the closure of the enclosing module or function to run.
struct lambda : public gc {
#ifdef DEBUG_FRAME
lambda()
: name("<unnamed>") {}
virtual ~lambda() {}
string name;
#endif
// The instructions to follow.
program *code;
// The number of parameters of the function. This does not include the
// closure of the enclosing module or function.
size_t params;
// The total number of items that will be stored in the closure of this
// function. Includes the higher closure, the parameters, and the local
// variables.
// NOTE: In order to help garbage collection, this could be modified to
// have one array store escaping items, and another to store non-
// escaping items.
size_t vars;
};
// The code run is just a string of instructions. The ops are actual commands
// to be run, but constants, labels, and other objects can be in the code.
struct inst : public gc {
enum opcode {
pop, intpush, constpush,
varpush, varsave, fieldpush, fieldsave,
builtin, jmp, cjmp, njmp, popcall,
pushclosure, makefunc, ret,
alloc, pushframe, popframe,
#ifdef COMBO
// Combo instructions:
// varpop = varsave+pop and fieldpop = fieldsave+pop
varpop, fieldpop,
// gejmp = bltin greater-than-equal (for ints) + cjmp OR
// = bltin less-than-equal + njmp
gejmp
#endif
};
opcode op;
position pos;
item ref;
};
template<typename T>
inline T get(const inst& it)
{ return get<T>(it.ref); }
} // namespace vm
#endif
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