libvm

Register-based VM as C library

####Current instruction set:####

Opcode	Description
OP_ADD	Sums two operands
OP_SUB	Subtracts two operands
OP_MULT	Mutiplies two operands
OP_DIV	Divides two operands
OP_PRINT	Prints something
OP_JMP	Jumps to somewhere
OP_HALT	Ends VM execution

####Example####

#include <stdio.h>
#include <stdlib.h>
#include "vm.h"

/* PLUS instruction implementation */
void plus_impl(VM_HANDLER_ARGS)
{
	if (VM_T(op1) == INT && VM_T(op1) == VM_T(op2)) {
		VM_INT(result) = VM_INT(op1) + VM_INT(op2);
	} else {
		printf("Error: operation not implemented!");
	}
}

/* PRINT instruction implementation */
void print_impl(VM_HANDLER_ARGS)
{
	switch (VM_T(op1)) {
	case INT:	printf("%d\n", op1->value.vint); break;
	case STR: 	printf("%s\n", op1->value.vstr); break;
	case DBL:	printf("%.f\n", op1->value.vdouble); break;
	default:	break;
	}
}

int main(int argc, char **argv)
{
	int val1 = atoi(argv[1]), val2 = atoi(argv[2]);
	vm_env env;

	vm_init(&env);

	vm_add_inst(&env, (vm_inst){
		.opcode  = OP_ADD,
		.op1 	 = {CONST, vm_add_const(&env, INT, &val1)},
		.op2 	 = {CONST, vm_add_const(&env, INT, &val2)},
		.result  = vm_get_temp(&env),
		.handler = plus_impl
	});

	vm_add_inst(&env, (vm_inst){
		.opcode  = OP_PRINT,
		.op1 	 = {TEMP, vm_get_last_temp(&env)},
		.handler = print_impl
	});

	vm_add_inst(&env, (vm_inst){OP_HALT});

	vm_run(&env);
}

For more example, see the compiler.c on test dir.