/**
 * vm.h
 * Copyright (C) 2017 Alexander Koch
 * Golem stack-based virtual machine (GVM)
 *
 * The virtual machine runs the generated bytecode.
 * Instructions are defined in bytecode.h and Bytecode.md.
 */

#ifndef vm_h
#define vm_h

#include <time.h>
#include <assert.h>
#include <stdint.h>

#include "../adt/vector.h"
#include "../adt/hashmap.h"

#include "../vm/val.h"
#include "../vm/bytecode.h"
#include "../lib/libdef.h"
#include "../lib/native.h"

#define STACK_SIZE 512

/**
 * vm_t - VM definition
 *
 * @stack General purpose Stack / RAM
 * @pc Program counter
 * @fp Frame pointer
 * @sp Stack pointer
 * @firstVal Current reference for GC
 * @numObject Counted objects by GC
 * @maxObjects Count of objects when GC is triggered
 * @errjmp Jump position when failure occurs.
 * @argc Argument count
 * @argc Arguments
 */
typedef struct {
	// Stack
	val_t stack[STACK_SIZE];
	int pc;
	int fp;
	int sp;

	// Gargabe collection
	obj_t* firstVal;
	int numObjects;
	int maxObjects;

	int errjmp;
	int argc;
	char** argv;
} vm_t;

// Internal function
typedef void (*gvm_c_function)(vm_t*);

// Methods
void vm_run(vm_t* vm, vector_t* buffer);
void vm_run_args(vm_t* vm, vector_t* buffer, int argc, char** argv);

void vm_register(vm_t* vm, val_t val);
void vm_push(vm_t* vm, val_t val);
val_t vm_pop(vm_t* vm);
void vm_gc(vm_t* vm);

#endif