Initial commit
* Parser, compiler, objects, and VM base implementations * Stuff will print out, functions called, etc * There are probably plenty of bugs but this is a good starting point to start committing changes into git Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
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/target
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Cargo.lock
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# This file is automatically @generated by Cargo.
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-x86_64-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows-sys"
|
||||||
|
version = "0.45.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
|
||||||
|
dependencies = [
|
||||||
|
"windows-targets",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows-targets"
|
||||||
|
version = "0.42.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
|
||||||
|
dependencies = [
|
||||||
|
"windows_aarch64_gnullvm",
|
||||||
|
"windows_aarch64_msvc",
|
||||||
|
"windows_i686_gnu",
|
||||||
|
"windows_i686_msvc",
|
||||||
|
"windows_x86_64_gnu",
|
||||||
|
"windows_x86_64_gnullvm",
|
||||||
|
"windows_x86_64_msvc",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_aarch64_gnullvm"
|
||||||
|
version = "0.42.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_aarch64_msvc"
|
||||||
|
version = "0.42.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_gnu"
|
||||||
|
version = "0.42.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_msvc"
|
||||||
|
version = "0.42.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_gnu"
|
||||||
|
version = "0.42.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_gnullvm"
|
||||||
|
version = "0.42.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_msvc"
|
||||||
|
version = "0.42.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
|
||||||
14
Cargo.toml
Normal file
14
Cargo.toml
Normal file
@@ -0,0 +1,14 @@
|
|||||||
|
[package]
|
||||||
|
name = "not-python"
|
||||||
|
version = "0.1.0"
|
||||||
|
edition = "2021"
|
||||||
|
|
||||||
|
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||||
|
[build-dependencies]
|
||||||
|
lalrpop = "0.19.9"
|
||||||
|
|
||||||
|
[dependencies]
|
||||||
|
lalrpop-util = { version = "0.19.9", features = ["lexer"] }
|
||||||
|
gc = { version = "0.4", features = ["derive", "nightly"] }
|
||||||
|
regex = "1"
|
||||||
|
structopt = "0.3.26"
|
||||||
6
build.rs
Normal file
6
build.rs
Normal file
@@ -0,0 +1,6 @@
|
|||||||
|
fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||||
|
lalrpop::Configuration::new()
|
||||||
|
.generate_in_source_tree()
|
||||||
|
.process()?;
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
3
examples/hello.np
Normal file
3
examples/hello.np
Normal file
@@ -0,0 +1,3 @@
|
|||||||
|
println(123);
|
||||||
|
println(None);
|
||||||
|
println("hell world");
|
||||||
138
src/compile/compiler.rs
Normal file
138
src/compile/compiler.rs
Normal file
@@ -0,0 +1,138 @@
|
|||||||
|
use crate::compile::{scope::GlobalScope, thunk::Thunk};
|
||||||
|
use crate::obj::prelude::*;
|
||||||
|
use crate::obj::ObjPtr;
|
||||||
|
use crate::syn::ast::*;
|
||||||
|
use crate::vm::inst::Inst;
|
||||||
|
|
||||||
|
pub struct Compiler {
|
||||||
|
scope: GlobalScope,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Compiler {
|
||||||
|
pub fn new() -> Self {
|
||||||
|
Self {
|
||||||
|
scope: Default::default(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Gets the global scope.
|
||||||
|
pub fn scope(&self) -> &GlobalScope {
|
||||||
|
&self.scope
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Gets the global scope, mutably.
|
||||||
|
pub fn scope_mut(&mut self) -> &mut GlobalScope {
|
||||||
|
&mut self.scope
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Compile the given list of AST statements, returning the body.
|
||||||
|
pub fn compile_stmts(&mut self, stmts: &Vec<SpStmt>) -> Vec<Inst> {
|
||||||
|
self.gather_names(stmts);
|
||||||
|
let mut thunks = Vec::new();
|
||||||
|
for stmt in stmts {
|
||||||
|
thunks.push(self.emit_stmt(stmt));
|
||||||
|
}
|
||||||
|
Thunk::List(thunks).flatten()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn emit_stmt(&mut self, stmt: &SpStmt) -> Thunk {
|
||||||
|
match stmt.inner() {
|
||||||
|
Stmt::Assign(_lhs_expr, _expr) => todo!(),
|
||||||
|
Stmt::Expr(expr) => {
|
||||||
|
let mut thunk = self.emit_expr(expr);
|
||||||
|
thunk.push(Inst::Pop);
|
||||||
|
thunk
|
||||||
|
}
|
||||||
|
Stmt::If { .. } => todo!(),
|
||||||
|
Stmt::Def { .. } => todo!(),
|
||||||
|
Stmt::Import { .. } => todo!(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn emit_expr(&mut self, expr: &SpExpr) -> Thunk {
|
||||||
|
match expr.inner() {
|
||||||
|
Expr::Call(expr, args) => {
|
||||||
|
let mut thunk = Vec::with_capacity(args.len() + 1);
|
||||||
|
thunk.push(self.emit_expr(expr));
|
||||||
|
thunk.extend(args.iter().map(|arg| self.emit_expr(arg)));
|
||||||
|
let mut thunk = Thunk::List(thunk);
|
||||||
|
thunk.push(Inst::Call(args.len()));
|
||||||
|
thunk
|
||||||
|
}
|
||||||
|
Expr::Get(expr, name) => {
|
||||||
|
let mut thunk = self.emit_expr(expr);
|
||||||
|
thunk.push(Inst::GetAttr(name.clone()));
|
||||||
|
thunk
|
||||||
|
}
|
||||||
|
Expr::Atom(atom) => self.emit_atom(atom),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn emit_atom(&mut self, atom: &SpAtom) -> Thunk {
|
||||||
|
match atom.inner() {
|
||||||
|
Atom::Int(i) => Thunk::Block(vec![Inst::Push(ObjPtr::new(Int::new(*i)))]),
|
||||||
|
Atom::Float(_) => todo!(), // Thunk::Block(vec![Inst::Push(Gc::new(Float::new(*f)))]),
|
||||||
|
Atom::Str(s) => Thunk::Block(vec![Inst::Push(ObjPtr::new(Str::new(s.clone())))]),
|
||||||
|
Atom::Sym(_) => todo!(),
|
||||||
|
Atom::Name(n) => {
|
||||||
|
// Look up the symbol first. It may already exist.
|
||||||
|
// If it doesn't exist, create it. It may be created
|
||||||
|
// dynamically.
|
||||||
|
let name = self
|
||||||
|
.scope()
|
||||||
|
.lookup_scoped(n)
|
||||||
|
.unwrap_or_else(|| self.scope_mut().insert_local(n));
|
||||||
|
Thunk::Block(vec![Inst::Load(name)])
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Gather all names from the list of statements and add them to the scope.
|
||||||
|
fn gather_names(&mut self, stmts: &Vec<SpStmt>) {
|
||||||
|
for stmt in stmts {
|
||||||
|
match stmt.inner() {
|
||||||
|
Stmt::Assign(lhs, _) => match lhs {
|
||||||
|
AssignLhs::Name(name) => {
|
||||||
|
self.scope_mut().insert_local(name);
|
||||||
|
}
|
||||||
|
AssignLhs::Complex(expr, _) => self.gather_expr_names(expr.inner()),
|
||||||
|
},
|
||||||
|
Stmt::Def { name, .. } => {
|
||||||
|
self.scope_mut().insert_local(name);
|
||||||
|
}
|
||||||
|
Stmt::Expr(expr) => {
|
||||||
|
// Get the names of the variables used in this expr
|
||||||
|
self.gather_expr_names(expr.inner());
|
||||||
|
}
|
||||||
|
Stmt::If { .. } => {
|
||||||
|
todo!()
|
||||||
|
}
|
||||||
|
Stmt::Import { .. } => {
|
||||||
|
todo!()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Gather the names used inside of an expression, recursively.
|
||||||
|
fn gather_expr_names(&mut self, expr: &Expr) {
|
||||||
|
match expr {
|
||||||
|
Expr::Call(fun, args) => {
|
||||||
|
self.gather_expr_names(fun.inner());
|
||||||
|
for arg in args {
|
||||||
|
self.gather_expr_names(arg.inner());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Expr::Get(head, _) => {
|
||||||
|
self.gather_expr_names(head.inner());
|
||||||
|
}
|
||||||
|
Expr::Atom(atom) => match atom.inner() {
|
||||||
|
Atom::Name(name) => {
|
||||||
|
self.scope_mut().insert_local(name);
|
||||||
|
}
|
||||||
|
// TODO symbols
|
||||||
|
_ => { /* no-op on non-names */ }
|
||||||
|
},
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
25
src/compile/const_table.rs
Normal file
25
src/compile/const_table.rs
Normal file
@@ -0,0 +1,25 @@
|
|||||||
|
use std::any::{Any, TypeId};
|
||||||
|
use std::collections::BTreeMap;
|
||||||
|
|
||||||
|
type ConstId = usize;
|
||||||
|
|
||||||
|
#[derive(Debug, Default)]
|
||||||
|
pub struct ConstTable {
|
||||||
|
tables: BTreeMap<TypeId, BTreeMap<ConstId, Box<dyn Any + 'static>>>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl ConstTable {
|
||||||
|
/// Registers a type of constant. This should be done before anything of a
|
||||||
|
/// given type is added.
|
||||||
|
pub fn register_type<T: Any + 'static>(&mut self) {
|
||||||
|
let type_id = TypeId::of::<T>();
|
||||||
|
assert!(
|
||||||
|
!self.tables.contains_key(&type_id),
|
||||||
|
"type {} already registered in const table",
|
||||||
|
std::any::type_name::<T>()
|
||||||
|
);
|
||||||
|
self.tables.insert(type_id, Default::default());
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn insert<T: Any + 'static>(&mut self) {}
|
||||||
|
}
|
||||||
4
src/compile/mod.rs
Normal file
4
src/compile/mod.rs
Normal file
@@ -0,0 +1,4 @@
|
|||||||
|
pub mod compiler;
|
||||||
|
//pub mod const_table;
|
||||||
|
pub mod scope;
|
||||||
|
pub mod thunk;
|
||||||
79
src/compile/scope.rs
Normal file
79
src/compile/scope.rs
Normal file
@@ -0,0 +1,79 @@
|
|||||||
|
use crate::vm::name::Name;
|
||||||
|
use std::collections::BTreeMap;
|
||||||
|
|
||||||
|
pub type LocalScope = BTreeMap<Name, String>;
|
||||||
|
|
||||||
|
#[derive(Debug, Default)]
|
||||||
|
pub struct GlobalScope {
|
||||||
|
names: Vec<String>,
|
||||||
|
scopes: Vec<LocalScope>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl GlobalScope {
|
||||||
|
pub fn push(&mut self, local: LocalScope) {
|
||||||
|
self.scopes.push(local);
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn pop(&mut self) -> Option<LocalScope> {
|
||||||
|
self.scopes.pop()
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn lookup_scoped(&self, name: &str) -> Option<Name> {
|
||||||
|
self.scopes
|
||||||
|
.iter()
|
||||||
|
.filter_map(|names| {
|
||||||
|
names
|
||||||
|
.iter()
|
||||||
|
.find(|(_, s)| s.as_str() == name)
|
||||||
|
.map(|(n, _)| *n)
|
||||||
|
})
|
||||||
|
.next()
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn lookup_local(&self, name: &str) -> Option<Name> {
|
||||||
|
self.scopes.last().and_then(|names| {
|
||||||
|
names
|
||||||
|
.iter()
|
||||||
|
.find(|(_, s)| s.as_str() == name)
|
||||||
|
.map(|(n, _)| *n)
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn insert_local(&mut self, name: impl ToString) -> Name {
|
||||||
|
let name = name.to_string();
|
||||||
|
if let Some(local) = self.lookup_local(&name) {
|
||||||
|
local
|
||||||
|
} else {
|
||||||
|
let next = Name(self.names.len());
|
||||||
|
self.names.push(name.clone());
|
||||||
|
let top = self.scopes.last_mut().expect("no scope");
|
||||||
|
top.insert(next, name);
|
||||||
|
next
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_global_scope_insert() {
|
||||||
|
let mut scope = GlobalScope::default();
|
||||||
|
scope.push(Default::default());
|
||||||
|
assert_eq!(scope.insert_local("zero"), Name(0));
|
||||||
|
assert_eq!(scope.insert_local("zero"), Name(0));
|
||||||
|
assert_eq!(scope.insert_local("one"), Name(1));
|
||||||
|
assert_eq!(scope.insert_local("zero"), Name(0));
|
||||||
|
assert_eq!(scope.insert_local("one"), Name(1));
|
||||||
|
scope.push(Default::default());
|
||||||
|
assert_eq!(scope.insert_local("zero"), Name(2));
|
||||||
|
assert_eq!(scope.insert_local("one"), Name(3));
|
||||||
|
assert_eq!(scope.insert_local("zero"), Name(2));
|
||||||
|
assert_eq!(scope.insert_local("one"), Name(3));
|
||||||
|
scope.push(Default::default());
|
||||||
|
assert_eq!(scope.insert_local("zero"), Name(4));
|
||||||
|
assert_eq!(scope.insert_local("one"), Name(5));
|
||||||
|
scope.pop().unwrap();
|
||||||
|
assert_eq!(scope.insert_local("zero"), Name(2));
|
||||||
|
assert_eq!(scope.insert_local("one"), Name(3));
|
||||||
|
scope.pop().unwrap();
|
||||||
|
assert_eq!(scope.insert_local("zero"), Name(0));
|
||||||
|
assert_eq!(scope.insert_local("one"), Name(1));
|
||||||
|
}
|
||||||
52
src/compile/thunk.rs
Normal file
52
src/compile/thunk.rs
Normal file
@@ -0,0 +1,52 @@
|
|||||||
|
use crate::vm::inst::Inst;
|
||||||
|
|
||||||
|
pub enum Thunk {
|
||||||
|
Block(Vec<Inst>),
|
||||||
|
List(Vec<Thunk>),
|
||||||
|
/*
|
||||||
|
IfElse {
|
||||||
|
cond: Box<Thunk>,
|
||||||
|
if_true: Box<Thunk>,
|
||||||
|
if_false: Box<Thunk>,
|
||||||
|
},
|
||||||
|
*/
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Thunk {
|
||||||
|
pub fn flatten(self) -> Vec<Inst> {
|
||||||
|
use Thunk::*;
|
||||||
|
match self {
|
||||||
|
Block(block) => block,
|
||||||
|
List(list) => list.into_iter().flat_map(|thunk| thunk.flatten()).collect(),
|
||||||
|
/*
|
||||||
|
IfElse { .. } => {
|
||||||
|
todo!("flatten if/else")
|
||||||
|
}
|
||||||
|
*/
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn push(&mut self, inst: Inst) {
|
||||||
|
use Thunk::*;
|
||||||
|
match self {
|
||||||
|
Block(block) => {
|
||||||
|
block.push(inst);
|
||||||
|
}
|
||||||
|
List(list) => {
|
||||||
|
if let Some(Block(last)) = list.last_mut() {
|
||||||
|
// if this is a block, then push the inst to the end of the
|
||||||
|
// block instead of creating a new element
|
||||||
|
last.push(inst);
|
||||||
|
} else {
|
||||||
|
// otherwise, push a new list block
|
||||||
|
list.push(Block(vec![inst]));
|
||||||
|
}
|
||||||
|
} /*
|
||||||
|
IfElse { .. } => {
|
||||||
|
// replace this with a List type, with *self as the first element
|
||||||
|
todo!()
|
||||||
|
}
|
||||||
|
*/
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
93
src/main.rs
Normal file
93
src/main.rs
Normal file
@@ -0,0 +1,93 @@
|
|||||||
|
#![feature(lazy_cell)]
|
||||||
|
mod compile;
|
||||||
|
mod obj;
|
||||||
|
mod syn;
|
||||||
|
mod vm;
|
||||||
|
|
||||||
|
use std::io::Read;
|
||||||
|
use std::path::PathBuf;
|
||||||
|
use structopt::StructOpt;
|
||||||
|
use vm::inst::Inst;
|
||||||
|
|
||||||
|
use crate::obj::prelude::*;
|
||||||
|
use crate::vm::frame::{Frame, UserFrame};
|
||||||
|
|
||||||
|
#[derive(Debug, StructOpt)]
|
||||||
|
struct Opt {
|
||||||
|
#[structopt(name = "PATH", parse(from_os_str))]
|
||||||
|
path: Option<PathBuf>,
|
||||||
|
}
|
||||||
|
|
||||||
|
type Result<T = (), E = Box<dyn std::error::Error>> = std::result::Result<T, E>;
|
||||||
|
|
||||||
|
fn main() -> Result {
|
||||||
|
let opt = Opt::from_args();
|
||||||
|
|
||||||
|
let (text, _path) = if let Some(path) = opt.path.as_ref() {
|
||||||
|
(std::fs::read_to_string(path)?, path.display().to_string())
|
||||||
|
} else {
|
||||||
|
let mut input = String::new();
|
||||||
|
std::io::stdin().read_to_string(&mut input)?;
|
||||||
|
(input, "<stdin>".to_string())
|
||||||
|
};
|
||||||
|
|
||||||
|
let stmts = syn::parser::FileParser::new().parse(&text).unwrap();
|
||||||
|
//println!("{:#?}", stmts);
|
||||||
|
let builtin_names: &[(&str, ObjPtr)] = &[("None", ObjPtr::clone(&NONE_INST))];
|
||||||
|
|
||||||
|
let (mut exec_body, scope) = {
|
||||||
|
let mut compiler = compile::compiler::Compiler::new();
|
||||||
|
compiler.scope_mut().push(Default::default());
|
||||||
|
|
||||||
|
// add builtin function names
|
||||||
|
for (name, _ptr) in BUILTIN_FUNS {
|
||||||
|
compiler.scope_mut().insert_local(name);
|
||||||
|
}
|
||||||
|
|
||||||
|
for (name, _ptr) in builtin_names {
|
||||||
|
compiler.scope_mut().insert_local(name);
|
||||||
|
}
|
||||||
|
|
||||||
|
let exec_body = compiler.compile_stmts(&stmts);
|
||||||
|
let scope = compiler.scope_mut().pop().unwrap();
|
||||||
|
(exec_body, scope)
|
||||||
|
};
|
||||||
|
|
||||||
|
// XXX
|
||||||
|
// Push the return statement to the end of the body since this doesn't get
|
||||||
|
// added otherwise.
|
||||||
|
exec_body.push(Inst::Push(ObjPtr::new(Int::new(0))));
|
||||||
|
exec_body.push(Inst::Return);
|
||||||
|
|
||||||
|
//println!("{:#?}", exec_body);
|
||||||
|
|
||||||
|
let locals: Vec<_> = scope.keys().copied().collect();
|
||||||
|
let main_fun: ObjPtr<_> = UserFun::new(None, vec![], locals, exec_body).into();
|
||||||
|
|
||||||
|
// Add the __main__ value
|
||||||
|
let mut main_frame = UserFrame::new(main_fun.clone(), vec![], 0);
|
||||||
|
// Add builtin functions
|
||||||
|
for (name, ptr) in BUILTIN_FUNS {
|
||||||
|
let (opaque_name, _) = scope.iter().find(|(_, v)| v == name).unwrap();
|
||||||
|
main_frame.locals_mut().insert(
|
||||||
|
*opaque_name,
|
||||||
|
Some(ObjPtr::new(BuiltinFun::new(name.to_string(), *ptr))),
|
||||||
|
);
|
||||||
|
}
|
||||||
|
// Add builtin values
|
||||||
|
for (name, ptr) in builtin_names {
|
||||||
|
let (opaque_name, _) = scope.iter().find(|(_, v)| v == name).unwrap();
|
||||||
|
main_frame
|
||||||
|
.locals_mut()
|
||||||
|
.insert(*opaque_name, Some(ObjPtr::clone(ptr)));
|
||||||
|
}
|
||||||
|
//main_frame.locals_mut().insert(main_name, main_fun);
|
||||||
|
|
||||||
|
let mut vm = crate::vm::Vm::new();
|
||||||
|
vm.frames_mut().push(Frame::User(main_frame));
|
||||||
|
|
||||||
|
// Start 'er up
|
||||||
|
vm.resume();
|
||||||
|
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
137
src/obj/builtin_fun.rs
Normal file
137
src/obj/builtin_fun.rs
Normal file
@@ -0,0 +1,137 @@
|
|||||||
|
use std::fmt;
|
||||||
|
|
||||||
|
use crate::vm::frame::Frame;
|
||||||
|
use crate::{obj::prelude::*, vm::Vm};
|
||||||
|
|
||||||
|
pub type BuiltinFunPtr = fn(BuiltinFunVm, Vec<ObjPtr>, BuiltinFunState) -> BuiltinFunResult;
|
||||||
|
|
||||||
|
#[macro_export]
|
||||||
|
macro_rules! builtin_fun {
|
||||||
|
($name:expr, $ptr:expr) => {
|
||||||
|
$crate::obj::builtin_fun::BuiltinFun::new($name.into(), $ptr)
|
||||||
|
};
|
||||||
|
}
|
||||||
|
|
||||||
|
#[macro_export]
|
||||||
|
macro_rules! builtin_fun_ptr {
|
||||||
|
($($tt:tt)+) => { $crate::obj::ObjPtr::new(builtin_fun!($($tt)+)) };
|
||||||
|
}
|
||||||
|
|
||||||
|
pub use builtin_fun;
|
||||||
|
pub use builtin_fun_ptr;
|
||||||
|
|
||||||
|
/// A result from a builtin function.
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub enum BuiltinFunResult {
|
||||||
|
/// Return the given optional object.
|
||||||
|
Return(Option<ObjPtr>),
|
||||||
|
/// Yield function execution to the given stack frame.
|
||||||
|
Yield(Frame),
|
||||||
|
}
|
||||||
|
|
||||||
|
/// A builtin function may be resumed after it's done calling a user-defined
|
||||||
|
/// function. This enum determines what the function execution context is.
|
||||||
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||||
|
pub enum BuiltinFunState {
|
||||||
|
/// This function is being called for the first time.
|
||||||
|
Begin,
|
||||||
|
/// This function is being resumed after yielding control to some other function.
|
||||||
|
Resume(usize),
|
||||||
|
}
|
||||||
|
|
||||||
|
impl BuiltinFunState {
|
||||||
|
pub fn next(&self) -> Self {
|
||||||
|
match self {
|
||||||
|
BuiltinFunState::Begin => BuiltinFunState::Resume(0),
|
||||||
|
BuiltinFunState::Resume(n) => BuiltinFunState::Resume(n + 1),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// This is a wrapper structure around the VM that provides an API to a
|
||||||
|
/// `BuiltinFun` function call.
|
||||||
|
///
|
||||||
|
/// It has some extra checks that prevent the VM being used in a weird/unexpected way.
|
||||||
|
pub struct BuiltinFunVm<'vm> {
|
||||||
|
vm: &'vm mut Vm,
|
||||||
|
last_sp: usize,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<'vm> BuiltinFunVm<'vm> {
|
||||||
|
pub fn new(vm: &'vm mut Vm, last_sp: usize) -> Self {
|
||||||
|
Self { vm, last_sp }
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn stack(&self) -> &Vec<ObjPtr> {
|
||||||
|
self.vm.stack()
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn make_frame(&self, fun: ObjPtr, args: Vec<ObjPtr>) -> Option<Frame> {
|
||||||
|
self.vm.make_frame(fun, args)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn push_stack(&mut self, value: ObjPtr) {
|
||||||
|
self.vm.push_stack(value);
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn pop_stack(&mut self) -> Option<ObjPtr> {
|
||||||
|
if self.stack().len() <= self.last_sp {
|
||||||
|
panic!("Tried to underflow stack in BuiltinFun call ");
|
||||||
|
}
|
||||||
|
self.pop_stack_unchecked()
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn pop_stack_unchecked(&mut self) -> Option<ObjPtr> {
|
||||||
|
self.vm.pop_stack()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub struct BuiltinFun {
|
||||||
|
name: String,
|
||||||
|
fun: BuiltinFunPtr,
|
||||||
|
attrs: AttrsPtr,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl fmt::Debug for BuiltinFun {
|
||||||
|
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||||
|
fmt.debug_struct("BuiltinFun")
|
||||||
|
.field("name", &self.name)
|
||||||
|
.field(
|
||||||
|
"fun",
|
||||||
|
&format!(
|
||||||
|
"<builtin function at {:#016x}>",
|
||||||
|
(&self.fun as *const _) as usize
|
||||||
|
),
|
||||||
|
)
|
||||||
|
.field("attrs", &self.attrs)
|
||||||
|
.finish()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl BuiltinFun {
|
||||||
|
pub fn new(name: String, fun: BuiltinFunPtr) -> Self {
|
||||||
|
Self {
|
||||||
|
name,
|
||||||
|
fun,
|
||||||
|
attrs: Default::default(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn fun(&self) -> BuiltinFunPtr {
|
||||||
|
self.fun
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn name(&self) -> &String {
|
||||||
|
&self.name
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Obj for BuiltinFun {
|
||||||
|
fn attrs(&self) -> AttrsPtr {
|
||||||
|
AttrsPtr::clone(&self.attrs)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn as_any(&self) -> &(dyn std::any::Any + 'static) {
|
||||||
|
self
|
||||||
|
}
|
||||||
|
}
|
||||||
55
src/obj/builtins.rs
Normal file
55
src/obj/builtins.rs
Normal file
@@ -0,0 +1,55 @@
|
|||||||
|
//! Builtin functions and objects.
|
||||||
|
use crate::obj::prelude::*;
|
||||||
|
|
||||||
|
pub const BUILTIN_FUNS: &[(&str, BuiltinFunPtr)] = &[
|
||||||
|
//
|
||||||
|
("println", println),
|
||||||
|
("print", print),
|
||||||
|
];
|
||||||
|
|
||||||
|
fn println(vm: BuiltinFunVm, args: Vec<ObjPtr>, state: BuiltinFunState) -> BuiltinFunResult {
|
||||||
|
do_print(vm, args, state, "\n")
|
||||||
|
}
|
||||||
|
|
||||||
|
fn print(vm: BuiltinFunVm, args: Vec<ObjPtr>, state: BuiltinFunState) -> BuiltinFunResult {
|
||||||
|
do_print(vm, args, state, "")
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Shared logic of `print` and `println`.
|
||||||
|
/// It can append a string to the end of whatever is being printed.
|
||||||
|
fn do_print(
|
||||||
|
mut vm: BuiltinFunVm,
|
||||||
|
args: Vec<ObjPtr>,
|
||||||
|
state: BuiltinFunState,
|
||||||
|
end: &str,
|
||||||
|
) -> BuiltinFunResult {
|
||||||
|
const POST_CALL_STR: BuiltinFunState = BuiltinFunState::Resume(0);
|
||||||
|
|
||||||
|
if state == BuiltinFunState::Begin {
|
||||||
|
if args.len() == 0 {
|
||||||
|
println!();
|
||||||
|
return BuiltinFunResult::Return(None);
|
||||||
|
} else if args.len() != 1 {
|
||||||
|
todo!("Throw exception: arity error");
|
||||||
|
}
|
||||||
|
|
||||||
|
let arg = ObjPtr::clone(&args[0]);
|
||||||
|
let str_fun = arg.get("__str__").expect("No __str__ function?");
|
||||||
|
let frame = vm
|
||||||
|
.make_frame(str_fun, vec![arg])
|
||||||
|
.expect("__str__ attr was not a function?");
|
||||||
|
BuiltinFunResult::Yield(frame)
|
||||||
|
} else if state == POST_CALL_STR {
|
||||||
|
// Get return value, cast it as an `Any`, and then downcast to a string.
|
||||||
|
let result = vm.pop_stack().expect("No return value from __str__?");
|
||||||
|
let result_any = result.as_any();
|
||||||
|
if let Some(value) = result_any.downcast_ref::<Str>() {
|
||||||
|
print!("{}{}", value.value(), end);
|
||||||
|
} else {
|
||||||
|
todo!("Throw exception: __str__ function didn't return a Str?");
|
||||||
|
}
|
||||||
|
BuiltinFunResult::Return(None)
|
||||||
|
} else {
|
||||||
|
panic!("unexpected state: {state:?}");
|
||||||
|
}
|
||||||
|
}
|
||||||
53
src/obj/int.rs
Normal file
53
src/obj/int.rs
Normal file
@@ -0,0 +1,53 @@
|
|||||||
|
use crate::obj::prelude::*;
|
||||||
|
use std::{any::Any, sync::LazyLock};
|
||||||
|
|
||||||
|
pub type IntValue = i64;
|
||||||
|
|
||||||
|
static INT_ATTRS: LazyLock<AttrsPtr> = LazyLock::new(|| {
|
||||||
|
attrs_ptr! {
|
||||||
|
//
|
||||||
|
"__str__" => builtin_fun_ptr!("__str__", |_vm, args, _state| {
|
||||||
|
if args.len() != 1 {
|
||||||
|
todo!("Throw exception: arity error");
|
||||||
|
}
|
||||||
|
let arg_any = &args[0].as_any();
|
||||||
|
let obj = arg_any.downcast_ref::<Int>().expect("Int.__str__ did not receive Int?");
|
||||||
|
|
||||||
|
BuiltinFunResult::Return(Some(ObjPtr::new(Str::new(obj.value().to_string()))))
|
||||||
|
}),
|
||||||
|
}
|
||||||
|
});
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub struct Int {
|
||||||
|
attrs: AttrsPtr,
|
||||||
|
value: IntValue,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Int {
|
||||||
|
pub fn new(value: IntValue) -> Self {
|
||||||
|
let attrs = AttrsPtr::clone(&INT_ATTRS);
|
||||||
|
// TODO intern
|
||||||
|
Int { attrs, value }
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn value(&self) -> IntValue {
|
||||||
|
self.value
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Obj for Int {
|
||||||
|
fn attrs(&self) -> AttrsPtr {
|
||||||
|
AttrsPtr::clone(&self.attrs)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn as_any(&self) -> &(dyn Any + 'static) {
|
||||||
|
self
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl ToString for Int {
|
||||||
|
fn to_string(&self) -> String {
|
||||||
|
format!("{}", self.value())
|
||||||
|
}
|
||||||
|
}
|
||||||
73
src/obj/mod.rs
Normal file
73
src/obj/mod.rs
Normal file
@@ -0,0 +1,73 @@
|
|||||||
|
pub mod builtin_fun;
|
||||||
|
pub mod builtins;
|
||||||
|
pub mod int;
|
||||||
|
pub mod none;
|
||||||
|
pub mod str;
|
||||||
|
pub mod user_fun;
|
||||||
|
|
||||||
|
pub mod prelude {
|
||||||
|
// Module types
|
||||||
|
pub use super::{builtin_fun::*, int::*, none::*, str::*, user_fun::*};
|
||||||
|
// Local types
|
||||||
|
pub use super::{Attrs, AttrsPtr, Obj, ObjPtr};
|
||||||
|
// Macros
|
||||||
|
pub use super::{attrs, attrs_ptr};
|
||||||
|
// Builtins
|
||||||
|
pub use super::builtins::*;
|
||||||
|
}
|
||||||
|
|
||||||
|
use std::any::Any;
|
||||||
|
use std::collections::HashMap;
|
||||||
|
use std::fmt::Debug;
|
||||||
|
use std::sync::{Arc, RwLock};
|
||||||
|
|
||||||
|
// Macro definitions
|
||||||
|
|
||||||
|
#[macro_export]
|
||||||
|
macro_rules! attrs {
|
||||||
|
($($key:expr => $value:expr),* $(,)?) => {{
|
||||||
|
let mut __attrs = $crate::obj::Attrs::new();
|
||||||
|
$(
|
||||||
|
__attrs.insert($key.into(), $value);
|
||||||
|
)*
|
||||||
|
__attrs
|
||||||
|
}};
|
||||||
|
}
|
||||||
|
|
||||||
|
#[macro_export]
|
||||||
|
macro_rules! attrs_ptr {
|
||||||
|
($($tt:tt)*) => {{
|
||||||
|
$crate::obj::AttrsPtr::new(
|
||||||
|
std::sync::RwLock::new(
|
||||||
|
attrs! {
|
||||||
|
$($tt)*
|
||||||
|
}
|
||||||
|
)
|
||||||
|
)
|
||||||
|
}};
|
||||||
|
}
|
||||||
|
|
||||||
|
pub use attrs;
|
||||||
|
pub use attrs_ptr;
|
||||||
|
|
||||||
|
pub type ObjPtr<T = dyn Obj + 'static> = Arc<T>;
|
||||||
|
pub type Attrs = HashMap<String, ObjPtr>;
|
||||||
|
pub type AttrsPtr = Arc<RwLock<Attrs>>;
|
||||||
|
|
||||||
|
pub trait Obj: Debug + Sync + Send {
|
||||||
|
fn attrs(&self) -> AttrsPtr;
|
||||||
|
|
||||||
|
fn as_any(&self) -> &(dyn Any + 'static);
|
||||||
|
|
||||||
|
fn get(&self, key: &str) -> Option<ObjPtr> {
|
||||||
|
let attrs_ptr = self.attrs();
|
||||||
|
let attrs = attrs_ptr.read().unwrap();
|
||||||
|
attrs.get(key).cloned()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn set(&mut self, key: String, value: ObjPtr) -> Option<ObjPtr> {
|
||||||
|
let attrs_ptr = self.attrs();
|
||||||
|
let mut attrs = attrs_ptr.write().unwrap();
|
||||||
|
attrs.insert(key, value)
|
||||||
|
}
|
||||||
|
}
|
||||||
39
src/obj/none.rs
Normal file
39
src/obj/none.rs
Normal file
@@ -0,0 +1,39 @@
|
|||||||
|
use crate::obj::prelude::*;
|
||||||
|
use std::{any::Any, sync::LazyLock};
|
||||||
|
|
||||||
|
pub static NONE_INST: LazyLock<ObjPtr> = LazyLock::new(|| ObjPtr::new(None::new()));
|
||||||
|
static NONE_STR: LazyLock<ObjPtr> = LazyLock::new(|| ObjPtr::new(Str::new("None")));
|
||||||
|
|
||||||
|
static NONE_ATTRS: LazyLock<AttrsPtr> = LazyLock::new(|| {
|
||||||
|
attrs_ptr! {
|
||||||
|
//
|
||||||
|
"__str__" => builtin_fun_ptr!("__str__", |_vm, args, _state| {
|
||||||
|
if args.len() != 1 {
|
||||||
|
todo!("Throw exception: arity error");
|
||||||
|
}
|
||||||
|
BuiltinFunResult::Return(Some(ObjPtr::clone(&NONE_STR)))
|
||||||
|
}),
|
||||||
|
}
|
||||||
|
});
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct None {
|
||||||
|
attrs: AttrsPtr,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl None {
|
||||||
|
fn new() -> Self {
|
||||||
|
let attrs = AttrsPtr::clone(&NONE_ATTRS);
|
||||||
|
Self { attrs }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Obj for None {
|
||||||
|
fn attrs(&self) -> AttrsPtr {
|
||||||
|
AttrsPtr::clone(&self.attrs)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn as_any(&self) -> &(dyn Any + 'static) {
|
||||||
|
self
|
||||||
|
}
|
||||||
|
}
|
||||||
53
src/obj/str.rs
Normal file
53
src/obj/str.rs
Normal file
@@ -0,0 +1,53 @@
|
|||||||
|
use crate::obj::prelude::*;
|
||||||
|
use std::{any::Any, sync::LazyLock};
|
||||||
|
|
||||||
|
pub type StrValue = String;
|
||||||
|
|
||||||
|
static STR_ATTRS: LazyLock<AttrsPtr> = LazyLock::new(|| {
|
||||||
|
attrs_ptr! {
|
||||||
|
//
|
||||||
|
"__str__" => builtin_fun_ptr!("__str__", |_vm, mut args, _state| {
|
||||||
|
if args.len() != 1 {
|
||||||
|
todo!("Throw exception: arity error");
|
||||||
|
}
|
||||||
|
BuiltinFunResult::Return(Some(args.pop().unwrap()))
|
||||||
|
}),
|
||||||
|
}
|
||||||
|
});
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub struct Str {
|
||||||
|
attrs: AttrsPtr,
|
||||||
|
value: StrValue,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Str {
|
||||||
|
pub fn new(value: impl Into<StrValue>) -> Self {
|
||||||
|
let attrs = AttrsPtr::clone(&STR_ATTRS);
|
||||||
|
// TODO intern
|
||||||
|
Str {
|
||||||
|
attrs,
|
||||||
|
value: value.into(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn value(&self) -> &StrValue {
|
||||||
|
&self.value
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Obj for Str {
|
||||||
|
fn attrs(&self) -> AttrsPtr {
|
||||||
|
AttrsPtr::clone(&self.attrs)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn as_any(&self) -> &(dyn Any + 'static) {
|
||||||
|
self
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl ToString for Str {
|
||||||
|
fn to_string(&self) -> String {
|
||||||
|
self.value().clone()
|
||||||
|
}
|
||||||
|
}
|
||||||
50
src/obj/user_fun.rs
Normal file
50
src/obj/user_fun.rs
Normal file
@@ -0,0 +1,50 @@
|
|||||||
|
use crate::obj::prelude::*;
|
||||||
|
use crate::vm::{inst::Inst, name::Name};
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct UserFun {
|
||||||
|
name: Option<Name>,
|
||||||
|
params: Vec<Name>,
|
||||||
|
locals: Vec<Name>,
|
||||||
|
body: Vec<Inst>,
|
||||||
|
attrs: AttrsPtr,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl UserFun {
|
||||||
|
pub fn new(name: Option<Name>, params: Vec<Name>, locals: Vec<Name>, body: Vec<Inst>) -> Self {
|
||||||
|
Self {
|
||||||
|
name,
|
||||||
|
params,
|
||||||
|
locals,
|
||||||
|
body,
|
||||||
|
attrs: Default::default(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Returns the name of this function, `None` if it is anonymous.
|
||||||
|
pub fn name(&self) -> Option<Name> {
|
||||||
|
self.name
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn params(&self) -> &Vec<Name> {
|
||||||
|
&self.params
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn locals(&self) -> &Vec<Name> {
|
||||||
|
&self.locals
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn body(&self) -> &Vec<Inst> {
|
||||||
|
&self.body
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Obj for UserFun {
|
||||||
|
fn attrs(&self) -> AttrsPtr {
|
||||||
|
AttrsPtr::clone(&self.attrs)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn as_any(&self) -> &(dyn std::any::Any + 'static) {
|
||||||
|
self
|
||||||
|
}
|
||||||
|
}
|
||||||
72
src/syn/ast.rs
Normal file
72
src/syn/ast.rs
Normal file
@@ -0,0 +1,72 @@
|
|||||||
|
use crate::syn::Spanned;
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub enum Stmt {
|
||||||
|
Assign(AssignLhs, Expr),
|
||||||
|
Expr(SpExpr),
|
||||||
|
If {
|
||||||
|
if_true: SpCondExpr,
|
||||||
|
elseif: Vec<SpCondExpr>,
|
||||||
|
else_expr: Option<SpExpr>,
|
||||||
|
},
|
||||||
|
Def {
|
||||||
|
name: String,
|
||||||
|
params: Vec<SpParam>,
|
||||||
|
body: Vec<SpStmt>,
|
||||||
|
},
|
||||||
|
Import {
|
||||||
|
target: String,
|
||||||
|
from: Option<String>,
|
||||||
|
},
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub enum AssignLhs {
|
||||||
|
/// A simple assignment.
|
||||||
|
///
|
||||||
|
/// `x = foo`
|
||||||
|
Name(String),
|
||||||
|
|
||||||
|
/// A more complex assignment.
|
||||||
|
///
|
||||||
|
/// `x().bar = foo`
|
||||||
|
Complex(SpExpr, String),
|
||||||
|
}
|
||||||
|
|
||||||
|
pub type SpStmt = Spanned<Stmt>;
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub struct CondExpr {
|
||||||
|
pub cond: SpExpr,
|
||||||
|
pub expr: SpExpr,
|
||||||
|
}
|
||||||
|
|
||||||
|
pub type SpCondExpr = Spanned<CondExpr>;
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub struct Param {
|
||||||
|
pub name: String,
|
||||||
|
pub ty: Option<SpExpr>,
|
||||||
|
}
|
||||||
|
|
||||||
|
pub type SpParam = Spanned<Param>;
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub enum Expr {
|
||||||
|
Call(Box<SpExpr>, Vec<SpExpr>),
|
||||||
|
Get(Box<SpExpr>, String),
|
||||||
|
Atom(SpAtom),
|
||||||
|
}
|
||||||
|
|
||||||
|
pub type SpExpr = Spanned<Expr>;
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub enum Atom {
|
||||||
|
Int(i64),
|
||||||
|
Float(f64),
|
||||||
|
Str(String),
|
||||||
|
Sym(String),
|
||||||
|
Name(String),
|
||||||
|
}
|
||||||
|
|
||||||
|
pub type SpAtom = Spanned<Atom>;
|
||||||
69
src/syn/mod.rs
Normal file
69
src/syn/mod.rs
Normal file
@@ -0,0 +1,69 @@
|
|||||||
|
// TODO - remove this when we start working on the syntax again
|
||||||
|
#![allow(unused)]
|
||||||
|
|
||||||
|
pub mod ast;
|
||||||
|
pub mod parser;
|
||||||
|
|
||||||
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||||
|
pub struct Span {
|
||||||
|
start: usize,
|
||||||
|
end: usize,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Span {
|
||||||
|
pub fn new(start: usize, end: usize) -> Self {
|
||||||
|
Self { start, end }
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn start(&self) -> usize {
|
||||||
|
self.start
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn end(&self) -> usize {
|
||||||
|
self.end
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub struct Spanned<T> {
|
||||||
|
span: Span,
|
||||||
|
inner: T,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<T> Spanned<T> {
|
||||||
|
pub fn new(span: Span, inner: T) -> Self {
|
||||||
|
Self { span, inner }
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn span(&self) -> &Span {
|
||||||
|
&self.span
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn inner(&self) -> &T {
|
||||||
|
&self.inner
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn into_inner(self) -> T {
|
||||||
|
self.inner
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn split(self) -> (Span, T) {
|
||||||
|
(self.span, self.inner)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(self) fn unescape(s: impl ToString) -> String {
|
||||||
|
const REPLACE: &[(&str, &str)] = &[
|
||||||
|
(r"\\", r"\"),
|
||||||
|
("\\n", "\n"),
|
||||||
|
("\\t", "\t"),
|
||||||
|
("\\r", "\r"),
|
||||||
|
("\\\"", "\""),
|
||||||
|
("\\\'", "\'"),
|
||||||
|
];
|
||||||
|
let mut s = s.to_string();
|
||||||
|
for (old, new) in REPLACE {
|
||||||
|
s = s.replace(old, new);
|
||||||
|
}
|
||||||
|
s
|
||||||
|
}
|
||||||
62
src/syn/parser.lalrpop
Normal file
62
src/syn/parser.lalrpop
Normal file
@@ -0,0 +1,62 @@
|
|||||||
|
use std::str::FromStr;
|
||||||
|
use crate::syn::{Span, Spanned, unescape};
|
||||||
|
use crate::syn::ast::*;
|
||||||
|
|
||||||
|
|
||||||
|
grammar;
|
||||||
|
|
||||||
|
Spanned<T>: Spanned<T> = {
|
||||||
|
<start:@L> <inner:T> <end:@R> => Spanned::new(Span::new(start, end), inner),
|
||||||
|
};
|
||||||
|
|
||||||
|
pub File: Vec<SpStmt> = {
|
||||||
|
<mut head:(<SpStmt> ";")*> <tail:SpStmt?> => {
|
||||||
|
if let Some(tail) = tail {
|
||||||
|
head.push(tail);
|
||||||
|
}
|
||||||
|
head
|
||||||
|
},
|
||||||
|
}
|
||||||
|
|
||||||
|
pub SpStmt = Spanned<Stmt>;
|
||||||
|
|
||||||
|
pub Stmt: Stmt = {
|
||||||
|
<SpExpr> => Stmt::Expr(<>),
|
||||||
|
}
|
||||||
|
|
||||||
|
pub SpExpr = Spanned<Expr>;
|
||||||
|
|
||||||
|
pub Expr: Expr = {
|
||||||
|
<fun:SpExpr> "(" <mut argv:(<SpExpr> ",")*> <last:SpExpr?> ")" => {
|
||||||
|
let argv = match last {
|
||||||
|
Some(expr) => {
|
||||||
|
argv.push(expr);
|
||||||
|
argv
|
||||||
|
}
|
||||||
|
None => argv,
|
||||||
|
};
|
||||||
|
Expr::Call(Box::new(fun), argv)
|
||||||
|
},
|
||||||
|
<atom:SpAtom> => Expr::Atom(atom),
|
||||||
|
"(" <expr:Expr> ")" => expr,
|
||||||
|
};
|
||||||
|
|
||||||
|
|
||||||
|
pub SpAtom = Spanned<Atom>;
|
||||||
|
|
||||||
|
pub Atom: Atom = {
|
||||||
|
<s:Str> => Atom::Str(s),
|
||||||
|
<n:Int> => Atom::Int(n),
|
||||||
|
<name:Name> => Atom::Name(name),
|
||||||
|
};
|
||||||
|
|
||||||
|
Int: i64 = <s:r"[0-9]+"> => i64::from_str(s).unwrap();
|
||||||
|
Str: String = {
|
||||||
|
// NOTE - doing 1 .. s.len() - 1 is safe because these are ascii characters
|
||||||
|
// and will always be one byte
|
||||||
|
<s:r#""([^"\\]|\\[ntr"'\\])*""#> => unescape(&s[1..s.len() - 1]),
|
||||||
|
<s:r#"'([^"\\]|\\[ntr"'\\])*'"#> => unescape(&s[1..s.len() - 1]),
|
||||||
|
}
|
||||||
|
Name: String = {
|
||||||
|
<s:r"[a-zA-Z_][a-zA-Z0-9_]*"> => s.to_string(),
|
||||||
|
}
|
||||||
11540
src/syn/parser.rs
Normal file
11540
src/syn/parser.rs
Normal file
File diff suppressed because it is too large
Load Diff
190
src/vm/frame.rs
Normal file
190
src/vm/frame.rs
Normal file
@@ -0,0 +1,190 @@
|
|||||||
|
use std::collections::BTreeMap;
|
||||||
|
|
||||||
|
use crate::{
|
||||||
|
obj::{
|
||||||
|
builtin_fun::{BuiltinFun, BuiltinFunState},
|
||||||
|
user_fun::UserFun,
|
||||||
|
ObjPtr,
|
||||||
|
},
|
||||||
|
vm::name::Name,
|
||||||
|
};
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub enum Frame {
|
||||||
|
Builtin(BuiltinFrame),
|
||||||
|
User(UserFrame),
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Frame {
|
||||||
|
pub fn last_sp(&self) -> usize {
|
||||||
|
match self {
|
||||||
|
Frame::Builtin(frame) => frame.last_sp(),
|
||||||
|
Frame::User(frame) => frame.last_sp(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl From<UserFrame> for Frame {
|
||||||
|
fn from(other: UserFrame) -> Self {
|
||||||
|
Self::User(other)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl From<BuiltinFrame> for Frame {
|
||||||
|
fn from(other: BuiltinFrame) -> Self {
|
||||||
|
Self::Builtin(other)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct BuiltinFrame {
|
||||||
|
builtin_fun: ObjPtr,
|
||||||
|
args: Vec<ObjPtr>,
|
||||||
|
last_sp: usize,
|
||||||
|
state: BuiltinFunState,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl BuiltinFrame {
|
||||||
|
pub fn new(builtin_fun: ObjPtr, args: Vec<ObjPtr>, last_sp: usize) -> Self {
|
||||||
|
assert!(
|
||||||
|
builtin_fun.as_any().is::<BuiltinFun>(),
|
||||||
|
"BuiltinFrame::new got a new object pointer that isn't a BuiltinFun, instead got {builtin_fun:?}"
|
||||||
|
);
|
||||||
|
BuiltinFrame {
|
||||||
|
builtin_fun,
|
||||||
|
args,
|
||||||
|
last_sp,
|
||||||
|
state: BuiltinFunState::Begin,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn builtin_fun(&self) -> &BuiltinFun {
|
||||||
|
// TODO
|
||||||
|
// when downcast_ref_unchecked
|
||||||
|
if let Some(builtin_fun) = self.builtin_fun.as_any().downcast_ref() {
|
||||||
|
builtin_fun
|
||||||
|
} else {
|
||||||
|
// using panic! here so we get formatting
|
||||||
|
panic!(
|
||||||
|
"BuiltinFrame::new got a new object that isn't a BuiltinFun, instead got {:?}",
|
||||||
|
self.builtin_fun,
|
||||||
|
);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn args(&self) -> &Vec<ObjPtr> {
|
||||||
|
&self.args
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn state(&self) -> BuiltinFunState {
|
||||||
|
self.state
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn set_state(&mut self, state: BuiltinFunState) {
|
||||||
|
self.state = state;
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn last_sp(&self) -> usize {
|
||||||
|
self.last_sp
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub type FrameLocals = BTreeMap<Name, Option<ObjPtr>>;
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct UserFrame {
|
||||||
|
user_fun: ObjPtr,
|
||||||
|
last_sp: usize,
|
||||||
|
pc: usize,
|
||||||
|
locals: FrameLocals,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl UserFrame {
|
||||||
|
pub fn new(user_fun: ObjPtr, args: Vec<ObjPtr>, last_sp: usize) -> Self {
|
||||||
|
assert!(
|
||||||
|
user_fun.as_any().is::<UserFun>(),
|
||||||
|
"UserFrame::new got a new object pointer that isn't a UserFun, instead got {user_fun:?}"
|
||||||
|
);
|
||||||
|
|
||||||
|
let user_fun_obj: &UserFun = if let Some(user_fun) = user_fun.as_any().downcast_ref() {
|
||||||
|
user_fun
|
||||||
|
} else {
|
||||||
|
// using panic! here so we get formatting
|
||||||
|
panic!(
|
||||||
|
"UserFrame::new got a new object that isn't a UserFun, instead got {:?}",
|
||||||
|
user_fun,
|
||||||
|
)
|
||||||
|
};
|
||||||
|
|
||||||
|
// Check arity
|
||||||
|
if user_fun_obj.params().len() != args.len() {
|
||||||
|
todo!(
|
||||||
|
"Throw exception: arity error ({} args passed, {} expected)",
|
||||||
|
args.len(),
|
||||||
|
user_fun_obj.params().len()
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Create the locals
|
||||||
|
let mut locals = FrameLocals::new();
|
||||||
|
for local in user_fun_obj.locals().iter().copied() {
|
||||||
|
locals.insert(local, None);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Set the args
|
||||||
|
for (param, arg) in user_fun_obj.params().iter().copied().zip(args) {
|
||||||
|
assert!(
|
||||||
|
locals.contains_key(¶m),
|
||||||
|
"param {:?} not found in locals for function with name {:?}",
|
||||||
|
param,
|
||||||
|
user_fun_obj.name()
|
||||||
|
);
|
||||||
|
locals.insert(param, Some(arg));
|
||||||
|
}
|
||||||
|
|
||||||
|
Self {
|
||||||
|
user_fun,
|
||||||
|
last_sp,
|
||||||
|
pc: 0,
|
||||||
|
locals,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn user_fun(&self) -> &UserFun {
|
||||||
|
// TODO
|
||||||
|
// when downcast_ref_unchecked
|
||||||
|
if let Some(user_fun) = self.user_fun.as_any().downcast_ref() {
|
||||||
|
user_fun
|
||||||
|
} else {
|
||||||
|
// using panic! here so we get formatting
|
||||||
|
panic!(
|
||||||
|
"UserFrame::new got a new object that isn't a UserFun, instead got {:?}",
|
||||||
|
self.user_fun,
|
||||||
|
);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn last_sp(&self) -> usize {
|
||||||
|
self.last_sp
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn locals(&self) -> &FrameLocals {
|
||||||
|
&self.locals
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn locals_mut(&mut self) -> &mut FrameLocals {
|
||||||
|
&mut self.locals
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn get_inst(&self) -> &crate::vm::inst::Inst {
|
||||||
|
&self.user_fun().body()[self.pc]
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn pc(&self) -> usize {
|
||||||
|
self.pc
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn set_pc(&mut self, pc: usize) {
|
||||||
|
self.pc = pc;
|
||||||
|
}
|
||||||
|
}
|
||||||
32
src/vm/inst.rs
Normal file
32
src/vm/inst.rs
Normal file
@@ -0,0 +1,32 @@
|
|||||||
|
use crate::obj::ObjPtr;
|
||||||
|
use crate::vm::name::Name;
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub enum Inst {
|
||||||
|
/// Pushes an object to the stack.
|
||||||
|
Push(ObjPtr),
|
||||||
|
|
||||||
|
/// Loads a local value in a name and pushes it to the stack.
|
||||||
|
Load(Name),
|
||||||
|
|
||||||
|
/// Pops the top item off of the stack and stores it in a name.
|
||||||
|
Store(Name),
|
||||||
|
|
||||||
|
/// Get an attribute from the top item of the stack.
|
||||||
|
GetAttr(String),
|
||||||
|
|
||||||
|
/// Pops the top item off of the stack, discarding it.
|
||||||
|
Pop,
|
||||||
|
|
||||||
|
/// Pops the top N function arguments off the stack, and attempt to call the
|
||||||
|
/// next stack item.
|
||||||
|
Call(usize),
|
||||||
|
|
||||||
|
/// Exits the current function stack frame and returns control to the
|
||||||
|
/// calling function.
|
||||||
|
///
|
||||||
|
/// This will take the last value on top of the stack (the return value),
|
||||||
|
/// resize the stack to its last size (pre-call), and push the return value
|
||||||
|
/// back to the top of the stack.
|
||||||
|
Return,
|
||||||
|
}
|
||||||
246
src/vm/mod.rs
Normal file
246
src/vm/mod.rs
Normal file
@@ -0,0 +1,246 @@
|
|||||||
|
pub mod frame;
|
||||||
|
pub mod inst;
|
||||||
|
pub mod name;
|
||||||
|
|
||||||
|
use crate::obj::prelude::*;
|
||||||
|
use crate::vm::frame::{BuiltinFrame, UserFrame};
|
||||||
|
use crate::vm::{frame::Frame, inst::Inst, name::Name};
|
||||||
|
|
||||||
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||||
|
pub enum State {
|
||||||
|
Running,
|
||||||
|
Stopped,
|
||||||
|
}
|
||||||
|
|
||||||
|
/// The virtual machine structure.
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct Vm {
|
||||||
|
frames: Vec<Frame>,
|
||||||
|
state: State,
|
||||||
|
stack: Vec<ObjPtr>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Vm {
|
||||||
|
pub fn new() -> Self {
|
||||||
|
Self {
|
||||||
|
frames: Default::default(),
|
||||||
|
state: State::Stopped,
|
||||||
|
stack: Default::default(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn state(&self) -> State {
|
||||||
|
self.state
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Gets all stack frames.
|
||||||
|
pub fn frames(&self) -> &Vec<Frame> {
|
||||||
|
&self.frames
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Gets all stack frames, mutably.
|
||||||
|
pub fn frames_mut(&mut self) -> &mut Vec<Frame> {
|
||||||
|
&mut self.frames
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Gets the currently active stack frame.
|
||||||
|
pub fn active_frame(&self) -> Option<&Frame> {
|
||||||
|
self.frames().last()
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Gets the currently active stack frame.
|
||||||
|
pub fn active_frame_mut(&mut self) -> Option<&mut Frame> {
|
||||||
|
self.frames_mut().last_mut()
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Get the stack.
|
||||||
|
pub fn stack(&self) -> &Vec<ObjPtr> {
|
||||||
|
&self.stack
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Get the stack, mutably.
|
||||||
|
pub fn stack_mut(&mut self) -> &mut Vec<ObjPtr> {
|
||||||
|
&mut self.stack
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Push a value to the stack.
|
||||||
|
pub fn push_stack(&mut self, value: ObjPtr) {
|
||||||
|
self.stack_mut().push(value);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Pop a value from the stack.
|
||||||
|
pub fn pop_stack(&mut self) -> Option<ObjPtr> {
|
||||||
|
self.stack_mut().pop()
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Loads a given name in the currently executing context.
|
||||||
|
pub fn load(&self, name: Name) -> Option<ObjPtr> {
|
||||||
|
// Search up the stack frame for local variable with the given name
|
||||||
|
for frame in self.frames() {
|
||||||
|
match frame {
|
||||||
|
Frame::User(frame) => {
|
||||||
|
// Figure out if this frame should hold this local
|
||||||
|
if let Some(local) = frame.locals().get(&name) {
|
||||||
|
// Return the found value (regardless of whether it's set or not).
|
||||||
|
return local.clone();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Frame::Builtin(_frame) => continue,
|
||||||
|
}
|
||||||
|
}
|
||||||
|
None
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn make_frame(&self, fun: ObjPtr, args: Vec<ObjPtr>) -> Option<Frame> {
|
||||||
|
let fun_any = fun.as_any();
|
||||||
|
if fun_any.is::<BuiltinFun>() {
|
||||||
|
Some(Frame::Builtin(BuiltinFrame::new(
|
||||||
|
fun,
|
||||||
|
args,
|
||||||
|
self.stack().len(),
|
||||||
|
)))
|
||||||
|
} else if fun_any.is::<UserFun>() {
|
||||||
|
Some(Frame::User(UserFrame::new(fun, args, self.stack().len())))
|
||||||
|
} else {
|
||||||
|
todo!("Throw exception: Tried to call un-callable object: {fun:?}");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Execute an instruction, using the given program counter.
|
||||||
|
///
|
||||||
|
/// Returns the address of the next instruction to load.
|
||||||
|
fn exec_inst(&mut self) {
|
||||||
|
// don't like this, but this is the consequence of not using a pipeline I think
|
||||||
|
let frame = match self.active_frame_mut() {
|
||||||
|
Some(Frame::User(frame)) => frame,
|
||||||
|
other => panic!("Expected user frame, got {other:?} instead"),
|
||||||
|
};
|
||||||
|
|
||||||
|
let inst = frame.get_inst();
|
||||||
|
let pc = frame.pc() + 1;
|
||||||
|
let mut next_frame: Option<Frame> = None;
|
||||||
|
let mut pop_frame = false;
|
||||||
|
|
||||||
|
match &inst {
|
||||||
|
Inst::Push(value) => {
|
||||||
|
let value = value.clone();
|
||||||
|
self.push_stack(value)
|
||||||
|
}
|
||||||
|
Inst::Load(name) => {
|
||||||
|
let name = *name;
|
||||||
|
if let Some(value) = self.load(name) {
|
||||||
|
self.push_stack(value);
|
||||||
|
} else {
|
||||||
|
todo!("Throw exception: Could not load name {name:?} (is it set?)");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Inst::Store(_name) => todo!(),
|
||||||
|
Inst::GetAttr(_attr) => todo!(),
|
||||||
|
Inst::Pop => {
|
||||||
|
self
|
||||||
|
.pop_stack()
|
||||||
|
.expect("Inst::Pop executed, but there was no value on top of the stack. This is most likely a bug.");
|
||||||
|
}
|
||||||
|
Inst::Call(argc) => {
|
||||||
|
let argc = *argc;
|
||||||
|
let stack = self.stack_mut();
|
||||||
|
let split_at = stack.len() - argc;
|
||||||
|
let args = stack.split_off(split_at);
|
||||||
|
|
||||||
|
assert_eq!(
|
||||||
|
args.len(),
|
||||||
|
argc,
|
||||||
|
"Not enough arguments popped in Inst::Call"
|
||||||
|
);
|
||||||
|
|
||||||
|
let fun = stack.pop().expect("No function pointer in Inst::Call");
|
||||||
|
next_frame = self.make_frame(fun, args);
|
||||||
|
}
|
||||||
|
Inst::Return => {
|
||||||
|
let last_sp = frame.last_sp();
|
||||||
|
let return_value = self
|
||||||
|
.pop_stack()
|
||||||
|
.expect("Inst::Return expected a value on top of the stack, but it was empty.");
|
||||||
|
|
||||||
|
let _discard = self.stack_mut().split_at(last_sp);
|
||||||
|
self.push_stack(return_value);
|
||||||
|
pop_frame = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Same as the top - this time update the program counter
|
||||||
|
let frame = match self.active_frame_mut() {
|
||||||
|
Some(Frame::User(frame)) => frame,
|
||||||
|
other => panic!("Expected user frame, got {other:?} instead"),
|
||||||
|
};
|
||||||
|
frame.set_pc(pc);
|
||||||
|
|
||||||
|
// This *shouldn't* happen. But it'd be bad if it did.
|
||||||
|
assert!(!(next_frame.is_some() && pop_frame));
|
||||||
|
|
||||||
|
// Set up the next stack frame if that's required
|
||||||
|
if let Some(frame) = next_frame {
|
||||||
|
self.frames_mut().push(frame);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Pop the stack frame
|
||||||
|
if pop_frame {
|
||||||
|
self.frames_mut().pop();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Resumes execution of the currently running function.
|
||||||
|
pub fn resume(&mut self) {
|
||||||
|
self.state = State::Running;
|
||||||
|
while self.state() == State::Running {
|
||||||
|
// Get the currently running function, figure out what to do next.
|
||||||
|
match self.active_frame() {
|
||||||
|
Some(Frame::User(_)) => {
|
||||||
|
self.exec_inst();
|
||||||
|
}
|
||||||
|
Some(Frame::Builtin(frame)) => {
|
||||||
|
let state = frame.state();
|
||||||
|
let builtin_fun = frame.builtin_fun();
|
||||||
|
let fun_ptr = builtin_fun.fun();
|
||||||
|
let fun_name = builtin_fun.name().clone();
|
||||||
|
let args = frame.args().clone();
|
||||||
|
let last_sp = frame.last_sp();
|
||||||
|
// frame is implicitly dropped here
|
||||||
|
let result = fun_ptr(BuiltinFunVm::new(self, last_sp), args, state);
|
||||||
|
match result {
|
||||||
|
BuiltinFunResult::Return(maybe_value) => {
|
||||||
|
let frame = self
|
||||||
|
.frames_mut()
|
||||||
|
.pop()
|
||||||
|
.expect("Active frame modified by BuiltinFun");
|
||||||
|
// Reset the stack size
|
||||||
|
let _remain = self.stack_mut().split_at(frame.last_sp());
|
||||||
|
// Push the value to the stack
|
||||||
|
if let Some(value) = maybe_value {
|
||||||
|
self.stack_mut().push(value);
|
||||||
|
} else {
|
||||||
|
self.stack_mut().push(ObjPtr::clone(&NONE_INST));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
BuiltinFunResult::Yield(yield_to) => {
|
||||||
|
let frame = if let Some(Frame::Builtin(frame)) = self.active_frame_mut()
|
||||||
|
{
|
||||||
|
frame
|
||||||
|
} else {
|
||||||
|
panic!("Active frame modified by BuiltinFun {fun_name:?}");
|
||||||
|
};
|
||||||
|
// update builtin function's state for when we resume execution
|
||||||
|
let state = frame.state();
|
||||||
|
frame.set_state(state.next());
|
||||||
|
// yield control to the next function
|
||||||
|
self.frames_mut().push(yield_to);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
None => {
|
||||||
|
self.state = State::Stopped;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
2
src/vm/name.rs
Normal file
2
src/vm/name.rs
Normal file
@@ -0,0 +1,2 @@
|
|||||||
|
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
|
||||||
|
pub struct Name(pub usize);
|
||||||
Reference in New Issue
Block a user