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use std::ops::*;
use crate::bytecode::Instruction;
use crate::code::{CallProtocol, CodeObject};
use crate::context::Context;
use crate::module::{create_standard_module, ModuleProtocol, ENTRY_POINT};
use crate::value::{box_ruvalue, RuValue};
pub struct Vm {
ctx: Context,
}
impl Vm {
pub fn new() -> Self {
let mut ctx = Context::new();
ctx.load_and_import_all(Box::new(create_standard_module()) as Box<dyn ModuleProtocol>)
.unwrap();
Self { ctx }
}
pub fn context_mut(&mut self) -> &mut Context {
&mut self.ctx
}
pub fn load_and_import_all<T>(&mut self, module: T) -> Result<(), String>
where
T: Into<Box<dyn ModuleProtocol>>,
{
self.ctx.load_and_import_all(module.into())
}
pub fn run_object(&mut self, co: &dyn CallProtocol) -> Result<(), String> {
self.ctx.push_frame(0);
co.run(&mut self.ctx)?;
self.ctx.pop_frame();
Ok(())
}
pub fn run(&mut self) -> Result<(), String> {
match self.ctx.lookup_code_object(&ENTRY_POINT.into()) {
Some(co) => self.run_object(co.as_ref()),
None => Err(format!("no entry function called `{}`", ENTRY_POINT)),
}
}
}
macro_rules! ruvalue_operation {
($ctx:expr, $fn:ident) => {{
let first = $ctx.pop_value().unwrap();
let second = $ctx.pop_value().unwrap();
$ctx.push_value(first.$fn(second));
}};
}
macro_rules! ruvalue_compare {
($ctx:expr, $fn:ident) => {{
let first = $ctx.pop_value().unwrap();
let second = $ctx.pop_value().unwrap();
$ctx.push_value(RuValue::Bool(first.$fn(&second)));
}};
}
pub fn run_bytecode(co: &CodeObject, ctx: &mut Context) -> Result<(), String> {
let mut ip = 0;
while let Some(inx) = co.code.get(ip) {
match inx {
Instruction::Pushl(lidx) => {
let variable = &co.locals[*lidx as usize];
let local = ctx.frame_mut().unwrap().locals.get(variable).cloned();
let copy = local.unwrap().borrow().clone();
ctx.push_value(copy);
}
Instruction::Pushg(gidx) => {
let variable = &co.globals[*gidx as usize];
let global = ctx.globals.get(variable).unwrap();
let global = global.borrow().clone();
ctx.push_value(global);
}
Instruction::Pushc(cidx) => {
use crate::value;
let value = value::instantiate(ctx, &co.consts[*cidx as usize]);
ctx.push_value(value);
}
Instruction::Movel(lidx) => {
let first = ctx.pop_value().unwrap();
let variable = &co.locals[*lidx as usize];
ctx.frame_mut()
.unwrap()
.locals
.insert(variable.clone(), box_ruvalue(first));
}
Instruction::Moveg(gidx) => {
let variable = &co.globals[*gidx as usize];
let value = ctx.pop_value().unwrap();
ctx.globals.insert(variable.clone(), box_ruvalue(value));
}
Instruction::Discard => {
ctx.pop_value().unwrap();
}
Instruction::Dup => {
let last = ctx.stack_mut().last().cloned().unwrap();
ctx.push_value(last);
}
Instruction::Swap => {}
Instruction::Get => {
let key = ctx.pop_value().unwrap();
let obj = ctx.pop_value().unwrap();
let val = obj.get(key)?;
ctx.push_value(val);
}
Instruction::Set => {
let val = ctx.pop_value().unwrap();
let key = ctx.pop_value().unwrap();
let mut obj = ctx.pop_value().unwrap();
obj.set(key, val)?;
}
Instruction::Add => ruvalue_operation!(ctx, add),
Instruction::Sub => ruvalue_operation!(ctx, sub),
Instruction::Mul => ruvalue_operation!(ctx, mul),
Instruction::Div => ruvalue_operation!(ctx, div),
Instruction::Rem => ruvalue_operation!(ctx, rem),
Instruction::And => ruvalue_operation!(ctx, bitand),
Instruction::Or => ruvalue_operation!(ctx, bitor),
Instruction::Not => {
let first = ctx.pop_value().unwrap();
ctx.push_value(!first);
}
Instruction::Eq => ruvalue_compare!(ctx, eq),
Instruction::Ne => ruvalue_compare!(ctx, ne),
Instruction::Ge => ruvalue_compare!(ctx, ge),
Instruction::Gt => ruvalue_compare!(ctx, gt),
Instruction::Le => ruvalue_compare!(ctx, le),
Instruction::Lt => ruvalue_compare!(ctx, lt),
Instruction::Jmp(addr) => {
ip = *addr as usize;
continue;
}
Instruction::Jt(addr) => {
let first = ctx.pop_value().unwrap();
if first == RuValue::Bool(true) {
ip = *addr as usize;
continue;
}
}
Instruction::Jf(addr) => {
let first = ctx.pop_value().unwrap();
if first == RuValue::Bool(false) {
ip = *addr as usize;
continue;
}
}
Instruction::Call(argn, gidx) => {
let func = &co.globals[*gidx as usize];
if let Some(other_co) = ctx.lookup_code_object(func) {
ctx.push_frame(*argn);
other_co.run(ctx)?;
ctx.pop_frame();
} else {
return Err(format!("function `{}` not found", func));
}
}
Instruction::Ret => break,
Instruction::Interrupt(n) => {
if let Some(func) = &ctx.interrupts[*n as usize] {
func.clone()(ctx);
}
}
Instruction::Cast(tid) => {
let val = ctx.pop_value().unwrap();
let val = val.cast(*tid)?;
ctx.push_value(val);
}
Instruction::Load => {
let name = ctx.pop_value().unwrap();
let name = format!("{}", name);
ctx.load_and_import_by_name(name.as_ref())?;
}
}
ip += 1;
}
Ok(())
}