dnlmlr/nek-lang
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Playing around with non enum based bytecode

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This commit is contained in:
Daniel M 2022-02-01 09:08:09 +01:00
parent 85211b127d
commit 6096bb431a
2 changed files with 59 additions and 54 deletions
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78
src/bytecode.rs
View File

@ -2,6 +2,8 @@ use std::collections::HashMap;
use crate::ast::{Ast, Expr, Stmt, BinOpType};
type OpcodeSize = u32;
#[repr(u32)]
#[derive(Debug, Clone, Copy)]
pub enum OP {
@ -35,8 +37,6 @@ pub enum OP {
JumpFalse,
Value(u32),
Print,
DbgPrint,
@ -44,7 +44,7 @@ pub enum OP {
#[derive(Debug, Default)]
pub struct Compiler {
ops: Vec<OP>,
ops: Vec<u32>,
global_vars: HashMap<String, u64>,
}
@ -58,7 +58,7 @@ impl Compiler {
match stmt {
Stmt::Expr(expr) => {
self.compile_expr(expr);
self.ops.push(OP::Pop);
self.ops.push(OP::Pop as OpcodeSize);
}
Stmt::Let(name, rhs) => {
let id = self.global_vars.len() as u64;
@ -71,13 +71,13 @@ impl Compiler {
let idx_start = self.ops.len();
self.compile_expr(cond);
self.ops.push(OP::JumpFalse);
self.ops.push(OP::JumpFalse as OpcodeSize);
let idx_jmp = self.ops.len();
self.gen_i64(0);
self.compile(body);
self.ops.push(OP::Jump);
self.ops.push(OP::Jump as OpcodeSize);
self.gen_i64(idx_start as i64);
self.overwrite_i64(idx_jmp, self.ops.len() as i64);
@ -86,13 +86,13 @@ impl Compiler {
Stmt::If(cond, if_block, else_block) => {
self.compile_expr(cond);
self.ops.push(OP::JumpFalse);
self.ops.push(OP::JumpFalse as OpcodeSize);
let idx_if = self.ops.len();
self.gen_i64(0);
self.compile(if_block);
self.ops.push(OP::Jump);
self.ops.push(OP::Jump as OpcodeSize);
let idx_else = self.ops.len();
self.gen_i64(0);
@ -105,24 +105,24 @@ impl Compiler {
},
Stmt::DbgPrint(expr) => {
self.compile_expr(expr);
self.ops.push(OP::DbgPrint);
self.ops.push(OP::DbgPrint as OpcodeSize);
}
Stmt::Print(expr) => {
self.compile_expr(expr);
self.ops.push(OP::Print);
self.ops.push(OP::Print as OpcodeSize);
}
}
}
}
pub fn into_ops(self) -> Vec<OP> {
pub fn into_ops(self) -> Vec<u32> {
self.ops
}
pub fn compile_expr(&mut self, expr: &Expr) {
match expr {
Expr::I64(val) => {
self.ops.push(OP::Push);
self.ops.push(OP::Push as OpcodeSize);
self.gen_i64(*val)
}
Expr::Ident(name) => {
@ -155,48 +155,56 @@ impl Compiler {
self.compile_expr(rhs);
match bo {
BinOpType::Add => self.ops.push(OP::Add),
BinOpType::Sub => self.ops.push(OP::Subtract),
BinOpType::Mul => self.ops.push(OP::Multiply),
BinOpType::Div => self.ops.push(OP::Divide),
BinOpType::Mod => self.ops.push(OP::Modulo),
BinOpType::BOr => self.ops.push(OP::BOr),
BinOpType::BAnd => self.ops.push(OP::BAnd),
BinOpType::BXor => self.ops.push(OP::BXor),
BinOpType::Shl => self.ops.push(OP::Shl),
BinOpType::Shr => self.ops.push(OP::Shr),
BinOpType::Equ => self.ops.push(OP::Eq),
BinOpType::Neq => self.ops.push(OP::Neq),
BinOpType::Gt => self.ops.push(OP::Gt),
BinOpType::Ge => self.ops.push(OP::Ge),
BinOpType::Lt => self.ops.push(OP::Lt),
BinOpType::Le => self.ops.push(OP::Le),
BinOpType::Add => self.ops.push(OP::Add as OpcodeSize),
BinOpType::Sub => self.ops.push(OP::Subtract as OpcodeSize),
BinOpType::Mul => self.ops.push(OP::Multiply as OpcodeSize),
BinOpType::Div => self.ops.push(OP::Divide as OpcodeSize),
BinOpType::Mod => self.ops.push(OP::Modulo as OpcodeSize),
BinOpType::BOr => self.ops.push(OP::BOr as OpcodeSize),
BinOpType::BAnd => self.ops.push(OP::BAnd as OpcodeSize),
BinOpType::BXor => self.ops.push(OP::BXor as OpcodeSize),
BinOpType::Shl => self.ops.push(OP::Shl as OpcodeSize),
BinOpType::Shr => self.ops.push(OP::Shr as OpcodeSize),
BinOpType::Equ => self.ops.push(OP::Eq as OpcodeSize),
BinOpType::Neq => self.ops.push(OP::Neq as OpcodeSize),
BinOpType::Gt => self.ops.push(OP::Gt as OpcodeSize),
BinOpType::Ge => self.ops.push(OP::Ge as OpcodeSize),
BinOpType::Lt => self.ops.push(OP::Lt as OpcodeSize),
BinOpType::Le => self.ops.push(OP::Le as OpcodeSize),
BinOpType::Assign => unreachable!(),
}
}
fn gen_i64(&mut self, val: i64) {
self.ops.push(OP::Value((val & u32::MAX as i64) as u32));
self.ops.push(OP::Value((val >> 32) as u32));
// for i in 0 .. 8 {
// self.ops.push(((val >> i*8) & 0xff) as OpcodeSize);
// }
for i in 0 .. 2 {
self.ops.push(((val >> i*32) & 0xffffffff) as OpcodeSize);
}
}
fn overwrite_i64(&mut self, idx: usize, val: i64) {
self.ops[idx] = OP::Value((val & u32::MAX as i64) as u32);
self.ops[idx+1] = OP::Value((val >> 32) as u32);
// for i in 0 .. 8 {
// self.ops[idx+i] = ((val >> i*8) & 0xff) as OpcodeSize;
// }
for i in 0 .. 2 {
self.ops[idx+i] = ((val >> i*32) & 0xffffffff) as OpcodeSize;
}
}
fn gen_load(&mut self, addr: u64) {
self.ops.push(OP::Load);
self.ops.push(OP::Load as OpcodeSize);
self.gen_i64(addr as i64)
}
fn gen_store(&mut self, addr: u64) {
self.ops.push(OP::Store);
self.ops.push(OP::Store as OpcodeSize);
self.gen_i64(addr as i64)
}
}
pub fn compile(ast: &Ast) -> Vec<OP> {
pub fn compile(ast: &Ast) -> Vec<u32> {
let mut compiler = Compiler::new();
compiler.compile(ast);
compiler.into_ops()

35
src/vm.rs
View File

@ -2,7 +2,7 @@ use crate::{bytecode::OP, interpreter::Value};
#[derive(Debug, Default)]
pub struct Vm {
prog: Vec<OP>,
prog: Vec<u32>,
ip: usize,
stack: Vec<Value>,
@ -11,7 +11,7 @@ pub struct Vm {
}
impl Vm {
pub fn new(prog: Vec<OP>) -> Self {
pub fn new(prog: Vec<u32>) -> Self {
Self {
prog,
..Default::default()
@ -19,7 +19,7 @@ impl Vm {
}
pub fn run(&mut self) {
while let Some(op) = self.prog.get(self.ip).copied() {
while let Some(op) = self.prog.get(self.ip).copied().map(|op| unsafe { std::mem::transmute::<u32, OP>(op) }) {
self.ip += 1;
match op {
@ -136,9 +136,6 @@ impl Vm {
let vals = self.pop2_i64();
self.stack.push(Value::I64(vals.0 >> vals.1))
}
OP::Value(_) => {
panic!("This is not an instruction, but data. This should never be evaluated")
}
OP::Jump => {
self.ip = self.read_i64() as usize;
}
@ -168,22 +165,22 @@ impl Vm {
}
fn read_i64(&mut self) -> i64 {
let mut val = if let Some(OP::Value(val)) = self.prog.get(self.ip).copied() {
val
} else {
panic!("Expected Value as next OP")
} as i64;
let mut val = *self.prog.get(self.ip).unwrap() as i64;
val |= (*self.prog.get(self.ip + 1).unwrap() as i64) << 32;
self.ip += 1;
// let mut bytes = [0; 8];
// bytes.copy_from_slice(&self.prog[self.ip..self.ip+8]);
// val = i64::from_le_bytes(bytes);
val |= (if let Some(OP::Value(val)) = self.prog.get(self.ip).copied() {
val
} else {
panic!("Expected Value as next OP")
} as i64)
<< 32;
// for i in 0 .. 8 {
// if let Some(tmp) = self.prog.get(self.ip + i).copied() {
// val |= ((tmp as i64) << i*8) as i64;
// } else {
// panic!("Expected Value as next OP")
// }
// }
self.ip += 1;
self.ip += 2;
val
}