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use std::collections::HashMap;
use crate::opcodes::{Instruction, OpCode};
use crate::types::{FloatType, IntType};
use crate::consts::Const;
pub struct LocalVal {
name: String,
}
pub struct UpVal {}
pub struct Proto {
pub stack_size: u32,
pub param_count: u32,
pub code: Vec<Instruction>,
pub consts: Vec<Const>,
pub const_map: HashMap<Const, u32>,
pub local_vars: Vec<LocalVal>,
pub up_vars: Vec<UpVal>,
pub protos: Vec<Proto>,
}
impl Proto {
pub fn new() -> Proto {
Proto {
stack_size: 2,
param_count: 0,
code: Vec::new(),
consts: Vec::new(),
const_map: HashMap::new(),
local_vars: Vec::new(),
up_vars: Vec::new(),
protos: Vec::new(),
}
}
pub fn open(&mut self) {}
pub fn close(&mut self) {
self.code_return(0, 0);
}
pub fn code_return(&mut self, first: u32, nret: u32) {
self.code
.push(Instruction::create_ABC(OpCode::Return, first, nret + 1, 0));
}
pub fn code_nil(&mut self, start_reg: u32, n: u32) {
self.code.push(Instruction::create_ABC(
OpCode::LoadNil,
start_reg,
n - 1,
0,
));
}
pub fn code_bool(&mut self, reg: u32, v: bool) {
self.code.push(Instruction::create_ABC(
OpCode::LoadBool,
reg,
if v { 1 } else { 0 },
0,
));
}
pub fn code_const(&mut self, reg_index: u32, const_index: u32) {
self.code.push(Instruction::create_ABx(
OpCode::LoadK,
reg_index,
const_index,
));
}
pub fn code_move(&mut self, reg: u32, src: u32) {
self.code
.push(Instruction::create_ABC(OpCode::Move, reg, src, 0));
}
pub fn add_local_var(&mut self, name: &str) {
self.local_vars.push(LocalVal {
name: name.to_string(),
});
}
pub fn get_local_var(&self, name: &str) -> Option<u32> {
for (i, var) in self.local_vars.iter().enumerate() {
if var.name == name {
return Some(i as u32);
}
}
None
}
pub fn add_const(&mut self, k: Const) -> u32 {
match self.const_map.get(&k) {
Some(index) => *index,
None => {
let index = self.consts.len();
self.consts.push(k.clone());
self.const_map.insert(k, index as u32);
index as u32
}
}
}
}
use std::fmt;
impl fmt::Debug for Proto {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
writeln!(f)?;
writeln!(f, "stack size : {}", self.stack_size)?;
writeln!(f, "consts :")?;
for (i, k) in self.consts.iter().enumerate() {
writeln!(
f,
"| {:<5} | {:<10} |",
i,
match k {
Const::Int(i) => i.to_string(),
Const::Float(f) => f.to_string(),
Const::Str(s) => format!("\"{}\"", s.clone()),
}
)?;
}
writeln!(f, "locals :")?;
for (i, local) in self.local_vars.iter().enumerate() {
writeln!(f, "| {:<5} | {:<10} |", i, local.name)?;
}
writeln!(f, "instructions :")?;
writeln!(
f,
"| {:<5} | {:<10} | {:<5} | {:<5} | {:<5} |",
"line", "OP", "A", "B", "C"
)?;
for (i, instruction) in self.code.iter().enumerate() {
writeln!(f, "| {:<5} {:?}", i + 1, instruction)?;
}
Ok(())
}
}
pub struct ProtoContext {
pub reg_top: u32,
pub proto: Proto,
}
impl ProtoContext {
pub fn new() -> Self {
ProtoContext {
reg_top: 0,
proto: Proto::new(),
}
}
pub fn check_stack(&mut self, n: u32) {
let new_stack = self.reg_top + n;
if new_stack > self.proto.stack_size {
self.proto.stack_size = new_stack;
}
}
pub fn reverse_regs(&mut self, n: u32) -> u32 {
self.check_stack(n);
let index = self.reg_top;
self.reg_top += n;
index
}
pub fn get_reg_top(&self) -> u32 {
self.reg_top
}
pub fn free_reg(&mut self, n: u32) {
self.reg_top -= n;
}
}