爱特每羊队
1716 lines
66 KiB
Rust
1716 lines
66 KiB
Rust
#![allow(clippy::arc_with_non_send_sync)]
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use std::collections::HashMap;
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use std::sync::Arc;
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use oxide_bytecode::module::CompiledModule;
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use oxide_bytecode::opcode::{self, OpCode};
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use smallvec::SmallVec;
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pub use crate::bindings::init_kernel_builtins;
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use crate::coercion;
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use crate::native::{NativeFn, NativeResult};
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use crate::session_gc::SessionGc;
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use oxide_kernel::kernel::{KernelCore, KernelSession};
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use oxide_kernel::shape_forge::EMPTY_SHAPE_ID;
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use oxide_types::error::{JsError, JsErrorKind};
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use oxide_types::mem::{Epoch, P};
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use oxide_types::object::{JsObject, NativeFnPtr};
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use oxide_types::value::JsValue;
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pub(crate) const MAX_PROTO_CHAIN_DEPTH: usize = 1024;
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/// Convert a `NativeFnPtr` to a callable `NativeFn`.
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///
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/// # Safety
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/// The pointer stored in `ptr` must have been created from a valid `NativeFn` fn-item.
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/// This is the single point in the codebase where `NativeFnPtr → NativeFn` coercion happens.
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#[inline(always)]
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pub(crate) unsafe fn native_fn_ptr_to_fn(ptr: NativeFnPtr) -> NativeFn {
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std::mem::transmute::<*const (), NativeFn>(ptr.as_ptr())
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}
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fn js_error_kind(kind: &'static str) -> JsErrorKind {
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match kind {
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"TypeError" => JsErrorKind::TypeError,
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"RangeError" => JsErrorKind::RangeError,
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"ReferenceError" => JsErrorKind::ReferenceError,
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"SyntaxError" => JsErrorKind::SyntaxError,
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"URIError" => JsErrorKind::URIError,
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"EvalError" => JsErrorKind::EvalError,
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_ => JsErrorKind::Error,
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}
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}
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fn js_error_kind_name(kind: JsErrorKind) -> &'static str {
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match kind {
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JsErrorKind::TypeError => "TypeError",
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JsErrorKind::RangeError => "RangeError",
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JsErrorKind::ReferenceError => "ReferenceError",
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JsErrorKind::SyntaxError => "SyntaxError",
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JsErrorKind::Error => "Error",
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JsErrorKind::URIError => "URIError",
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JsErrorKind::EvalError => "EvalError",
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}
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}
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pub(crate) fn format_error_message(kind: &str, msg: &str) -> String {
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if msg.is_empty() || msg == kind || msg.starts_with(&format!("{kind}:")) {
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msg.to_string()
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} else {
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format!("{kind}: {msg}")
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}
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}
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#[allow(unused_macros)]
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macro_rules! throw_err {
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($self:ident, $kind:ident, $msg:expr) => {{
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match $self.raise_error_kind(stringify!($kind), $msg) {
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Ok(()) => continue,
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Err(e) => return Err(e),
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}
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}};
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}
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macro_rules! binary_arith {
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($self:ident, $a:expr, $b:expr, $rd:expr, $op:tt) => {{
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let l = $self.coerce_number_bounded($self.regs[$a])?;
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let r = $self.coerce_number_bounded($self.regs[$b])?;
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$self.regs[$rd] = JsValue::float(l $op r);
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}}
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}
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macro_rules! compound_arith {
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($self:ident, $rd:expr, $a:expr, $op:tt) => {{
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let l = $self.coerce_number_bounded($self.regs[$rd])?;
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let r = $self.coerce_number_bounded($self.regs[$a])?;
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$self.regs[$rd] = JsValue::float(l $op r);
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}}
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}
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#[derive(Debug, Clone, Copy)]
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pub enum FrameContinuation {
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None,
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AccessorGet { target_reg: u8 },
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AccessorSet,
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}
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pub struct CallFrame {
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pub return_addr: usize,
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pub function_name: u32,
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pub caller_reg_limit: u8,
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pub saved_regs: Box<[JsValue]>,
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pub saved_this: JsValue,
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pub saved_new_target: JsValue,
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pub callee: JsValue,
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pub construct_result_reg: Option<u8>,
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pub constructed_this: Option<JsValue>,
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pub is_derived_constructor: bool,
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pub continuation: FrameContinuation,
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}
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pub struct ForInIter<'bump> {
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pub keys: bumpalo::collections::Vec<'bump, JsValue>,
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pub index: usize,
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}
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pub struct TryHandler {
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pub catch_pc: Option<usize>,
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pub finally_pc: Option<usize>,
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pub frame_depth: usize,
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}
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/// Heap-allocated snapshot used by `call_bytecode_function_inline`.
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/// Keeping it on the heap prevents Rust stack overflow when JS code
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/// chains multiple sync bytecode calls (e.g. sort comparator, accessor).
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pub(crate) struct InlineSyncState {
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pub(crate) regs: Box<[JsValue; 256]>,
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pub(crate) pc: usize,
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pub(crate) bytecode: Vec<opcode::Instr>,
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pub(crate) constants: Vec<JsValue>,
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pub(crate) active_reg_limit: u8,
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pub(crate) root_reg_limit: u8,
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pub(crate) try_stack: Vec<TryHandler>,
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pub(crate) frames: SmallVec<[CallFrame; 16]>,
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pub(crate) exception_value: Option<JsValue>,
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pub(crate) pending_exception: Option<JsValue>,
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pub(crate) pending_error_kind: Option<&'static str>,
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pub(crate) for_in_iters: Vec<*mut ForInIter<'static>>,
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pub(crate) for_of_iters: Vec<JsValue>,
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pub(crate) last_for_of_result: JsValue,
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pub(crate) saved_bytecode_stack: Vec<Vec<opcode::Instr>>,
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pub(crate) saved_constants_stack: Vec<Vec<JsValue>>,
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}
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pub struct Vm {
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pub(crate) regs: [JsValue; 256],
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pub(crate) pc: usize,
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pub(crate) bytecode: Vec<opcode::Instr>,
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pub(crate) constants: Vec<JsValue>,
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pub(crate) frames: SmallVec<[CallFrame; 16]>,
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pub for_in_iters: Vec<*mut ForInIter<'static>>,
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pub(crate) kernel_core: Arc<KernelCore>,
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pub(crate) session: KernelSession,
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pub(crate) interned_strings: Vec<u32>,
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pub epoch: Epoch,
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pub(crate) session_epoch: bumpalo::Bump,
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pub(crate) session_gc: SessionGc,
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/// Long-lived forwarding map reused by GC sweep and promote.
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/// `mem::take`'d out for use, `clear()`'d and put back — capacity retained
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/// across collections, so no per-event `HashMap` allocation. `FxBuildHasher`
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/// because the keys are raw pointers (collision resistance is irrelevant).
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pub(crate) forwarding: HashMap<*mut JsObject, *mut JsObject, rustc_hash::FxBuildHasher>,
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pub(crate) epoch_object_ptrs: Vec<*mut JsObject>,
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pub(crate) session_object_ptrs: Vec<*mut JsObject>,
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pub(crate) session_bytes_allocated: usize,
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pub object_prototype: P<JsObject>,
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pub math_rng_state: u64,
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pub(crate) sub_modules: Vec<CompiledModule>,
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pub(crate) sub_module_constants: Vec<Vec<JsValue>>,
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pub(crate) saved_bytecode_stack: Vec<Vec<opcode::Instr>>,
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pub(crate) saved_constants_stack: Vec<Vec<JsValue>>,
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pub(crate) try_stack: Vec<TryHandler>,
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pub(crate) exception_value: Option<JsValue>,
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pub(crate) pending_exception: Option<JsValue>,
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pub(crate) pending_error_kind: Option<&'static str>,
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pub(crate) symbol_counter: u32,
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pub(crate) symbol_descriptions: Vec<String>,
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pub(crate) symbol_registry: HashMap<String, u32>,
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pub(crate) for_of_iters: Vec<JsValue>,
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pub(crate) last_for_of_result: JsValue,
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pub(crate) root_reg_limit: u8,
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pub(crate) active_reg_limit: u8,
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pub(crate) native_call_depth: usize,
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/// Set to Some(target_reg) when `ordinary_get` pushes a bytecode accessor frame.
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/// The dispatch loop checks this flag and skips writing `regs[target_reg]` from the
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/// call result — the value will be delivered by the RETURN handler instead.
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pub(crate) accessor_frame_target_reg: Option<u8>,
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pub(crate) ic_hits: std::cell::Cell<u64>,
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pub(crate) ic_misses: std::cell::Cell<u64>,
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pub(crate) instruction_count: u64,
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}
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impl Vm {
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const SYNC_NATIVE_ARG_BASE: usize = 0;
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const SYNC_NATIVE_ARG_LIMIT: usize = 253;
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pub(crate) fn coerce_primitive_bounded(&mut self, value: JsValue, prefer_string: bool) -> Result<JsValue, String> {
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if !value.is_object() {
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return Ok(value);
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}
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let obj_ptr = value.as_js_object_ptr();
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if obj_ptr.is_null() {
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return Ok(value);
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}
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let method_names = if prefer_string { ["toString", "valueOf"] } else { ["valueOf", "toString"] };
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for method_name in method_names {
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let method_si = self.kernel_core.string_forge().intern(method_name).0;
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let method = {
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let obj = unsafe { &*obj_ptr };
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self.ordinary_get(obj, method_si, value)?
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};
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if method.is_undefined() || method.is_null() {
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continue;
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}
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if !method.is_object() {
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return Err(format!("TypeError: {method_name} is not callable"));
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}
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let method_ptr = method.as_js_object_ptr();
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if method_ptr.is_null() || !unsafe { &*method_ptr }.is_function() {
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return Err(format!("TypeError: {method_name} is not callable"));
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}
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let result = self.call_function_sync(method, value, &[])?;
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if !result.is_object() {
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return Ok(result);
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}
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}
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Err(self.error_message_text("TypeError", "Cannot convert object to primitive value"))
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}
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pub(crate) fn coerce_number_bounded(&mut self, value: JsValue) -> Result<f64, String> {
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let primitive = self.coerce_primitive_bounded(value, false)?;
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Ok(coercion::to_number(primitive, self.kernel_core.string_forge().as_ref()))
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}
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pub(crate) fn coerce_int32_bounded(&mut self, value: JsValue) -> Result<i32, String> {
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let n = self.coerce_number_bounded(value)?;
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if n == 0.0 || !n.is_finite() {
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return Ok(0);
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}
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let int = n.trunc().rem_euclid(4_294_967_296.0) as u32;
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if int > i32::MAX as u32 {
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Ok((int as i64 - 4_294_967_296i64) as i32)
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} else {
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Ok(int as i32)
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}
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}
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pub(crate) fn coerce_uint32_bounded(&mut self, value: JsValue) -> Result<u32, String> {
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let n = self.coerce_number_bounded(value)?;
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if n == 0.0 || !n.is_finite() {
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return Ok(0);
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}
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Ok(n.trunc().rem_euclid(4_294_967_296.0) as u32)
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}
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fn pack_sync_native_call_args(
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&mut self, receiver: JsValue, callee: JsValue, args: &[JsValue],
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) -> Result<Vec<u8>, String> {
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if args.len() > Self::SYNC_NATIVE_ARG_LIMIT {
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return Err(format!(
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"RangeError: synchronous native call supports at most {} arguments",
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Self::SYNC_NATIVE_ARG_LIMIT
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));
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}
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self.regs[253] = receiver;
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self.regs[254] = callee;
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let mut arg_regs = Vec::with_capacity(args.len() + 1);
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arg_regs.push(253);
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for (idx, arg) in args.iter().enumerate() {
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let reg = (Self::SYNC_NATIVE_ARG_BASE + idx) as u8;
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self.regs[reg as usize] = *arg;
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arg_regs.push(reg);
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}
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Ok(arg_regs)
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}
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pub(crate) fn is_session_ptr(&self, obj_ptr: *mut JsObject) -> bool {
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if obj_ptr.is_null() {
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return false;
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}
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// SAFETY: obj_ptr is non-null and points to a `JsObject` owned by this session.
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unsafe { (*obj_ptr).is_session_epoch() }
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}
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pub(crate) fn alloc_object(&mut self, obj: JsObject) -> *mut JsObject {
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let ptr = self.epoch.alloc(obj);
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self.epoch_object_ptrs.push(ptr);
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ptr
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}
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pub(crate) fn for_each_root(&self, mut f: impl FnMut(JsValue)) {
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for value in &self.regs {
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if value.is_object() || value.is_string() {
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f(*value);
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}
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}
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for frame in &self.frames {
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for &v in &frame.saved_regs {
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f(v);
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}
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f(frame.saved_this);
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f(frame.saved_new_target);
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f(frame.callee);
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f(frame.constructed_this.unwrap_or(JsValue::undefined()));
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}
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f(JsValue::from_js_object(self.session.global_object().as_ptr() as *mut JsObject));
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f(self.exception_value.unwrap_or(JsValue::undefined()));
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f(self.pending_exception.unwrap_or(JsValue::undefined()));
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for &v in &self.for_of_iters {
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f(v);
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}
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f(self.last_for_of_result);
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for &v in &self.constants {
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f(v);
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}
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for sub_module in &self.sub_module_constants {
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for &v in sub_module {
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f(v);
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}
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}
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for saved_constants in &self.saved_constants_stack {
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for &v in saved_constants {
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f(v);
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}
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}
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for iter in &self.for_in_iters {
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if iter.is_null() {
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continue;
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}
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unsafe {
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for &v in (*(*iter)).keys.iter() {
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f(v);
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}
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}
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}
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}
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pub(crate) fn maybe_collect_session_gc(&mut self) {
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let mut session_gc = std::mem::take(&mut self.session_gc);
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session_gc.maybe_collect(self);
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self.session_gc = session_gc;
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}
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pub fn session_gc_stats(&self) -> &SessionGc {
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&self.session_gc
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}
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pub fn session_object_count(&self) -> usize {
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self.session_object_ptrs.len()
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}
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pub fn session_bytes_allocated(&self) -> usize {
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self.session_bytes_allocated
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}
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pub fn epoch_object_count(&self) -> usize {
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self.epoch_object_ptrs.len()
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}
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pub fn ic_hit_rate(&self) -> f64 {
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let total = self.ic_hits.get() + self.ic_misses.get();
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if total == 0 {
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0.0
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} else {
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self.ic_hits.get() as f64 / total as f64
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}
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}
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pub fn instruction_count(&self) -> u64 {
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self.instruction_count
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}
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pub fn symbol_registry_len(&self) -> usize {
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self.symbol_registry.len()
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}
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pub fn ic_hit_count(&self) -> u64 {
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self.ic_hits.get()
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}
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pub fn ic_miss_count(&self) -> u64 {
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self.ic_misses.get()
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}
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pub(crate) fn checked_object_ptr(
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&mut self, val: JsValue, error_msg: &str,
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) -> Result<Option<*mut JsObject>, String> {
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if !val.is_object() {
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self.raise_type_error(error_msg)?;
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return Ok(None);
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}
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let ptr = val.as_js_object_ptr();
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let addr = ptr as usize;
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if ptr.is_null() || addr < 0x10000 || addr % std::mem::align_of::<JsObject>() != 0 {
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self.raise_type_error(error_msg)?;
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return Ok(None);
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}
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Ok(Some(ptr))
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}
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pub(crate) fn raise_error_kind(&mut self, kind: &'static str, msg: &str) -> Result<(), String> {
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self.raise_js_error(JsError::new(js_error_kind(kind), msg))
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}
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pub(crate) fn raise_js_error(&mut self, err: JsError) -> Result<(), String> {
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let kind = js_error_kind_name(err.kind);
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let error = crate::builtins::error::create_kind_error(self, kind, &err.message);
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self.exception_value = Some(error);
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self.pending_error_kind = Some(kind);
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self.unwind()
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}
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pub(crate) fn raise_type_error(&mut self, msg: &str) -> Result<(), String> {
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self.raise_error_kind("TypeError", msg)
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}
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pub(crate) fn error_message_text(&self, kind: &str, msg: &str) -> String {
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format_error_message(kind, msg)
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}
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pub fn step_rng(&mut self) {
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if self.math_rng_state == 0 {
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self.math_rng_state = std::time::SystemTime::now()
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.duration_since(std::time::UNIX_EPOCH)
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.unwrap_or_default()
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.as_nanos() as u64;
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}
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self.math_rng_state = self
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.math_rng_state
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.wrapping_mul(6364136223846793005)
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.wrapping_add(1442695040888963407);
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}
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pub fn math_rng_value(&self) -> f64 {
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(self.math_rng_state >> 33) as f64 / (1u64 << 31) as f64
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}
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pub fn kernel_core(&self) -> &Arc<KernelCore> {
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&self.kernel_core
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}
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pub fn session(&self) -> &KernelSession {
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&self.session
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}
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pub(crate) fn is_object_prototype(&self, ptr: *const JsObject) -> bool {
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let proto_ptr = self.session.builtin_world().object_proto.as_ptr();
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std::ptr::eq(ptr, proto_ptr)
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}
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pub fn reg(&self, idx: u8) -> JsValue {
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self.regs[idx as usize]
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}
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pub fn set_reg(&mut self, idx: u8, val: JsValue) {
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self.regs[idx as usize] = val;
|
|
}
|
|
|
|
pub fn epoch(&self) -> &Epoch {
|
|
&self.epoch
|
|
}
|
|
|
|
pub fn lookup_str(&self, val: JsValue) -> Option<String> {
|
|
if !val.is_string() {
|
|
return None;
|
|
}
|
|
self.kernel_core.string_forge().lookup(val.as_string_index())
|
|
}
|
|
|
|
pub(crate) fn thrown_error_kind(&self, val: JsValue) -> &'static str {
|
|
if !val.is_object() {
|
|
return "Error";
|
|
}
|
|
let name_si = self.kernel_core.string_forge().intern("name").0;
|
|
let obj = unsafe { &*val.as_js_object_ptr() };
|
|
let Some(name_val) = self.resolve_property(obj, name_si) else {
|
|
return "Error";
|
|
};
|
|
let Some(name) = self.lookup_str(name_val) else {
|
|
return "Error";
|
|
};
|
|
match name.as_str() {
|
|
"TypeError" => "TypeError",
|
|
"ReferenceError" => "ReferenceError",
|
|
"RangeError" => "RangeError",
|
|
"SyntaxError" => "SyntaxError",
|
|
"URIError" => "URIError",
|
|
"EvalError" => "EvalError",
|
|
"Error" => "Error",
|
|
_ => "Error",
|
|
}
|
|
}
|
|
|
|
pub(crate) fn property_key_si(&mut self, val: JsValue) -> u32 {
|
|
if val.is_string() {
|
|
return val.as_string_index();
|
|
}
|
|
let key = coercion::to_string(self.kernel_core.string_forge().as_ref(), val);
|
|
self.kernel_core.string_forge().intern(&key).0
|
|
}
|
|
|
|
pub(crate) fn array_index_from_property_key(&self, prop_name_si: u32) -> Option<u32> {
|
|
let key = self.kernel_core.string_forge().lookup(prop_name_si)?;
|
|
if key.is_empty() || (key.len() > 1 && key.starts_with('0')) {
|
|
return None;
|
|
}
|
|
key.parse::<u32>().ok()
|
|
}
|
|
|
|
pub(crate) fn resolve_property(&self, obj: &JsObject, prop_name_si: u32) -> Option<JsValue> {
|
|
let length_si = self.kernel_core.string_forge().intern("length").0;
|
|
if obj.is_array() && prop_name_si == length_si {
|
|
return Some(JsValue::int(obj.prop_count() as i32));
|
|
}
|
|
if obj.is_array() {
|
|
if let Some(index) = self.array_index_from_property_key(prop_name_si) {
|
|
if index < obj.prop_vec_len() as u32 {
|
|
return Some(obj.get_prop_at(index));
|
|
}
|
|
}
|
|
}
|
|
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(obj.shape_id(), prop_name_si) {
|
|
let val = obj.get_prop_at(pos);
|
|
if !val.is_undefined() || obj.prop_vec_len() > pos as usize {
|
|
return Some(val);
|
|
}
|
|
}
|
|
let mut proto = obj.proto();
|
|
let mut depth = 0usize;
|
|
while proto.is_object() && depth < MAX_PROTO_CHAIN_DEPTH {
|
|
depth += 1;
|
|
let proto_obj = unsafe { &*proto.as_js_object_ptr() };
|
|
if let Some(pos) = self
|
|
.kernel_core
|
|
.shape_forge()
|
|
.lookup_position(proto_obj.shape_id(), prop_name_si)
|
|
{
|
|
let val = proto_obj.get_prop_at(pos);
|
|
if !val.is_undefined() || proto_obj.prop_vec_len() > pos as usize {
|
|
return Some(val);
|
|
}
|
|
}
|
|
proto = proto_obj.proto();
|
|
}
|
|
None
|
|
}
|
|
|
|
pub(crate) fn get_own_property_slot(&self, obj: &JsObject, prop_name_si: u32) -> Option<u32> {
|
|
let length_si = self.kernel_core.string_forge().intern("length").0;
|
|
if obj.is_array() && prop_name_si == length_si {
|
|
return None;
|
|
}
|
|
if obj.is_array() {
|
|
if let Some(index) = self.array_index_from_property_key(prop_name_si) {
|
|
if index < obj.prop_vec_len() as u32 {
|
|
return Some(index);
|
|
}
|
|
}
|
|
}
|
|
self.kernel_core
|
|
.shape_forge()
|
|
.lookup_position(obj.shape_id(), prop_name_si)
|
|
.and_then(|pos| {
|
|
let val = obj.get_prop_at(pos);
|
|
if !val.is_undefined() || obj.prop_vec_len() > pos as usize {
|
|
Some(pos)
|
|
} else {
|
|
None
|
|
}
|
|
})
|
|
}
|
|
|
|
pub(crate) fn call_function_sync(
|
|
&mut self, callee: JsValue, receiver: JsValue, args: &[JsValue],
|
|
) -> Result<JsValue, String> {
|
|
if !callee.is_object() {
|
|
return Err(self.error_message_text("TypeError", "accessor is not callable"));
|
|
}
|
|
let callee_obj = unsafe { &*callee.as_js_object_ptr() };
|
|
if !callee_obj.is_function() {
|
|
return Err(self.error_message_text("TypeError", "accessor is not callable"));
|
|
}
|
|
|
|
if let Some(native_fn) = callee_obj.native_fn() {
|
|
if self.native_call_depth >= self.kernel_core.config.max_call_depth {
|
|
self.raise_error_kind("RangeError", "Maximum call stack size exceeded")?;
|
|
return Ok(JsValue::undefined());
|
|
}
|
|
let saved_regs = self.regs;
|
|
let arg_regs = self.pack_sync_native_call_args(receiver, callee, args)?;
|
|
// SAFETY: native_fn was set via set_native_fn with a valid NativeFn pointer;
|
|
// native_fn_ptr_to_fn is the single coercion point for NativeFnPtr → NativeFn.
|
|
let func: NativeFn = unsafe { native_fn_ptr_to_fn(native_fn) };
|
|
self.native_call_depth += 1;
|
|
let result = func(self, &arg_regs);
|
|
self.native_call_depth -= 1;
|
|
self.regs = saved_regs;
|
|
return match result {
|
|
NativeResult::Ok(val) => Ok(val),
|
|
NativeResult::Err(err) => Err(self.error_text(err)),
|
|
NativeResult::TailCall { callee, this, args } => self.call_function_sync(callee, this, &args),
|
|
};
|
|
}
|
|
|
|
// Run bytecode function inline on self (same epoch) to prevent use-after-free.
|
|
// A separate sub-VM would own a different epoch; returning a JsValue that contains
|
|
// a pointer into the sub-VM epoch and then dropping the sub-VM causes a dangling
|
|
// pointer / access violation in release builds.
|
|
self.call_bytecode_function_inline(callee, callee_obj, receiver, args)
|
|
}
|
|
|
|
#[expect(clippy::too_many_arguments)]
|
|
pub(crate) fn push_bytecode_frame(
|
|
&mut self, callee: JsValue, this_value: JsValue, args: &[JsValue], construct_result_reg: Option<u8>,
|
|
constructed_this: Option<JsValue>, new_target: JsValue, continuation: FrameContinuation,
|
|
) -> Result<(), String> {
|
|
if !callee.is_object() {
|
|
return Err(self.error_message_text("TypeError", "CALL target is not callable"));
|
|
}
|
|
let obj = unsafe { &*callee.as_js_object_ptr() };
|
|
if !obj.is_function() || obj.sub_module_index() == 0 {
|
|
return Err(self.error_message_text("TypeError", "CALL target is not callable"));
|
|
}
|
|
let sub_idx = obj.sub_module_index() as usize - 1;
|
|
if sub_idx >= self.sub_modules.len() {
|
|
return Err(format!(
|
|
"CALL: sub_module_index {} out of bounds (max {})",
|
|
sub_idx,
|
|
self.sub_modules.len()
|
|
));
|
|
}
|
|
if self.frames.len() >= self.kernel_core.config.max_call_depth {
|
|
return self.raise_error_kind("RangeError", "Maximum call stack size exceeded");
|
|
}
|
|
|
|
let sub_bytecode = self.sub_modules[sub_idx].bytecode.clone();
|
|
let sub_n_args = self.sub_modules[sub_idx].n_args as usize;
|
|
let sub_n_registers = self.sub_modules[sub_idx].n_registers;
|
|
let sub_constants = self.sub_modules[sub_idx].constants.clone();
|
|
let sub_param_base = self.sub_modules[sub_idx].param_base as usize;
|
|
let sub_is_arrow = self.sub_modules[sub_idx].is_arrow;
|
|
let caller_reg_limit = self.active_reg_limit.max(1);
|
|
let saved_regs = self.regs[..caller_reg_limit as usize].to_vec().into_boxed_slice();
|
|
let saved_this = self.regs[254];
|
|
let saved_new_target = self.regs[255];
|
|
|
|
for i in 0..sub_n_args {
|
|
self.regs[sub_param_base + i] = args.get(i).copied().unwrap_or(JsValue::undefined());
|
|
}
|
|
self.regs[254] = if sub_is_arrow { obj.captured_this() } else { this_value };
|
|
self.regs[255] = new_target;
|
|
|
|
let converted_sub_constants = self.convert_constants(&sub_constants).map_err(String::from)?;
|
|
self.saved_bytecode_stack.push(std::mem::take(&mut self.bytecode));
|
|
self.saved_constants_stack.push(std::mem::take(&mut self.constants));
|
|
|
|
let function_name = self.sub_modules[sub_idx]
|
|
.function_name
|
|
.as_deref()
|
|
.map(|name| self.kernel_core.string_forge().intern(name).0)
|
|
.unwrap_or(0);
|
|
|
|
self.frames.push(CallFrame {
|
|
return_addr: self.pc,
|
|
function_name,
|
|
caller_reg_limit,
|
|
saved_regs,
|
|
saved_this,
|
|
saved_new_target,
|
|
callee,
|
|
construct_result_reg,
|
|
constructed_this,
|
|
is_derived_constructor: obj.is_derived_constructor(),
|
|
continuation,
|
|
});
|
|
|
|
self.bytecode = sub_bytecode;
|
|
self.constants = converted_sub_constants;
|
|
for (name, reg) in &self.sub_modules[sub_idx].builtin_reg_map.clone() {
|
|
let si = self.kernel_core.string_forge().intern(name.as_str()).0;
|
|
let global = self.session.global_object();
|
|
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(global.shape_id(), si) {
|
|
self.regs[*reg as usize] = global.get_prop_at(pos);
|
|
}
|
|
}
|
|
|
|
self.active_reg_limit = sub_n_registers.max(1);
|
|
self.pc = 0;
|
|
Ok(())
|
|
}
|
|
|
|
pub(crate) fn dispatch(&mut self) -> Result<JsValue, String> {
|
|
let mut steps: u64 = 0;
|
|
loop {
|
|
steps += 1;
|
|
if let Some(max_steps) = self.kernel_core.config.max_steps {
|
|
if steps > max_steps {
|
|
self.instruction_count = steps;
|
|
return Err(format!("VM step limit exceeded at pc={}", self.pc));
|
|
}
|
|
}
|
|
if self.pc >= self.bytecode.len() {
|
|
self.instruction_count = steps;
|
|
return Err("program counter out of bounds".into());
|
|
}
|
|
|
|
let instr = self.bytecode[self.pc];
|
|
let op = opcode::opcode(instr);
|
|
let rd = opcode::rd(instr) as usize;
|
|
let a = opcode::a(instr) as usize;
|
|
let b = opcode::b(instr) as usize;
|
|
self.pc += 1;
|
|
|
|
match op {
|
|
OpCode::NOP => {}
|
|
|
|
OpCode::HALT => {
|
|
self.instruction_count = steps;
|
|
return Ok(self.regs[0]);
|
|
}
|
|
|
|
OpCode::LOAD_CONST => {
|
|
self.dispatch_load_const(rd, instr)?;
|
|
}
|
|
|
|
OpCode::ADD => {
|
|
self.dispatch_add(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::SUB => {
|
|
binary_arith!(self, a, b, rd, -);
|
|
}
|
|
|
|
OpCode::MUL => {
|
|
binary_arith!(self, a, b, rd, *);
|
|
}
|
|
|
|
OpCode::DIV => {
|
|
binary_arith!(self, a, b, rd, /);
|
|
}
|
|
|
|
OpCode::MOD => {
|
|
binary_arith!(self, a, b, rd, %);
|
|
}
|
|
|
|
OpCode::NEG => {
|
|
let v = self.coerce_number_bounded(self.regs[a])?;
|
|
self.regs[rd] = JsValue::float(-v);
|
|
}
|
|
|
|
OpCode::BIT_AND => {
|
|
self.dispatch_bit_and(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::BIT_OR => {
|
|
self.dispatch_bit_or(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::BIT_XOR => {
|
|
self.dispatch_bit_xor(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::SHL => {
|
|
self.dispatch_shl(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::SHR => {
|
|
self.dispatch_shr(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::USHR => {
|
|
self.dispatch_ushr(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::BIT_NOT => {
|
|
self.dispatch_bit_not(rd, a)?;
|
|
}
|
|
|
|
OpCode::EQ => {
|
|
self.dispatch_eq(rd, a, b);
|
|
}
|
|
|
|
OpCode::NEQ => {
|
|
self.dispatch_neq(rd, a, b);
|
|
}
|
|
|
|
OpCode::LT => {
|
|
self.dispatch_lt(rd, a, b);
|
|
}
|
|
|
|
OpCode::GT => {
|
|
self.dispatch_gt(rd, a, b);
|
|
}
|
|
|
|
OpCode::LTE => {
|
|
self.dispatch_lte(rd, a, b);
|
|
}
|
|
|
|
OpCode::GTE => {
|
|
self.dispatch_gte(rd, a, b);
|
|
}
|
|
|
|
OpCode::STRICT_EQ => {
|
|
self.dispatch_strict_eq(rd, a, b);
|
|
}
|
|
|
|
OpCode::STRICT_NEQ => {
|
|
self.dispatch_strict_neq(rd, a, b);
|
|
}
|
|
|
|
OpCode::UNARY_PLUS => {
|
|
let v = self.coerce_number_bounded(self.regs[a])?;
|
|
self.regs[rd] = JsValue::float(v);
|
|
}
|
|
|
|
OpCode::JMP => {
|
|
let offset = opcode::offset16(instr) as isize;
|
|
self.pc = ((self.pc as isize) + offset - 1) as usize;
|
|
}
|
|
|
|
OpCode::JMP_IF_FALSE => {
|
|
let cond = coercion::to_boolean(self.regs[rd], self.kernel_core.string_forge().as_ref());
|
|
if !cond {
|
|
let offset = opcode::offset16(instr) as isize;
|
|
self.pc = ((self.pc as isize) + offset - 1) as usize;
|
|
}
|
|
}
|
|
|
|
OpCode::JMP_IF_TRUE => {
|
|
let cond = coercion::to_boolean(self.regs[rd], self.kernel_core.string_forge().as_ref());
|
|
if cond {
|
|
let offset = opcode::offset16(instr) as isize;
|
|
self.pc = ((self.pc as isize) + offset - 1) as usize;
|
|
}
|
|
}
|
|
|
|
OpCode::JMP_IF_NULLISH => {
|
|
if self.regs[rd].is_nullish() {
|
|
let offset = opcode::offset16(instr) as isize;
|
|
self.pc = ((self.pc as isize) + offset - 1) as usize;
|
|
}
|
|
}
|
|
|
|
OpCode::LOAD_VAR => {
|
|
if a == 254
|
|
&& self.frames.last().map(|frame| frame.is_derived_constructor).unwrap_or(false)
|
|
&& self.regs[a].is_undefined()
|
|
{
|
|
throw_err!(self, ReferenceError, "must call super constructor before using 'this'");
|
|
}
|
|
self.regs[rd] = self.regs[a];
|
|
}
|
|
|
|
OpCode::STORE_VAR => {
|
|
if b != 0 {
|
|
// const guard: check if already initialized
|
|
if !self.regs[rd].is_undefined() {
|
|
throw_err!(self, TypeError, "Assignment to constant variable");
|
|
}
|
|
}
|
|
self.regs[rd] = self.regs[a];
|
|
}
|
|
|
|
OpCode::CALL => match self.dispatch_call(rd, a, b) {
|
|
Ok(true) => continue,
|
|
Ok(false) => {}
|
|
Err(e) => return Err(e),
|
|
},
|
|
|
|
OpCode::CALL_NATIVE => {
|
|
self.dispatch_call_native(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::NEW_EXPRESSION => match self.dispatch_new_expression(rd, a, b) {
|
|
Ok(true) => continue,
|
|
Ok(false) => {}
|
|
Err(e) => return Err(e),
|
|
},
|
|
|
|
OpCode::SUPER_CALL => {
|
|
let first_arg_reg = a as u8;
|
|
let ext = self.bytecode[self.pc];
|
|
self.pc += 1;
|
|
let arg_count = (ext & 0xFF) as usize;
|
|
|
|
let Some(frame) = self.frames.last() else {
|
|
throw_err!(self, ReferenceError, "super() used outside class constructor");
|
|
};
|
|
if !frame.is_derived_constructor {
|
|
throw_err!(self, ReferenceError, "super() used outside derived constructor");
|
|
}
|
|
if !self.regs[254].is_undefined() {
|
|
throw_err!(self, ReferenceError, "super() called more than once");
|
|
}
|
|
let Some(derived_this) = frame.constructed_this else {
|
|
throw_err!(self, ReferenceError, "super() without derived this");
|
|
};
|
|
|
|
let new_target = self.regs[255];
|
|
if !new_target.is_object() {
|
|
throw_err!(self, TypeError, "super() new.target is not an object");
|
|
}
|
|
let new_target_obj = unsafe { &*new_target.as_js_object_ptr() };
|
|
let super_ctor = new_target_obj.proto();
|
|
if !super_ctor.is_object() {
|
|
throw_err!(self, TypeError, "super constructor is not an object");
|
|
}
|
|
let super_obj = unsafe { &*super_ctor.as_js_object_ptr() };
|
|
if !super_obj.is_function() {
|
|
throw_err!(self, TypeError, "super constructor is not a function");
|
|
}
|
|
|
|
if super_obj.native_fn().is_some() {
|
|
self.regs[253] = derived_this;
|
|
self.regs[254] = super_ctor; // bind_dispatcher reads regs[254] as the wrapper callee
|
|
let (args_buf, len) = Self::build_native_args(first_arg_reg, arg_count, 253);
|
|
// SAFETY: native_fn was set via set_native_fn with a valid NativeFn pointer;
|
|
// native_fn_ptr_to_fn is the single coercion point for NativeFnPtr → NativeFn.
|
|
let func: NativeFn = unsafe { native_fn_ptr_to_fn(super_obj.native_fn().unwrap()) };
|
|
match func(self, &args_buf[..len]) {
|
|
NativeResult::Ok(val) => {
|
|
self.regs[254] = if val.is_object() { val } else { derived_this };
|
|
self.regs[rd] = self.regs[254];
|
|
}
|
|
NativeResult::Err(err_val) => {
|
|
self.exception_value = Some(err_val);
|
|
self.pending_error_kind = Some(self.thrown_error_kind(err_val));
|
|
match self.unwind() {
|
|
Ok(()) => continue,
|
|
Err(e) => return Err(e),
|
|
}
|
|
}
|
|
NativeResult::TailCall { callee, this, args } => {
|
|
// e.g. bound function: resolve the tail call, use its return
|
|
// value as the constructed instance (or fall back to derived_this).
|
|
match self.call_function_sync(callee, this, &args) {
|
|
Ok(val) => {
|
|
self.regs[254] = if val.is_object() { val } else { derived_this };
|
|
self.regs[rd] = self.regs[254];
|
|
}
|
|
Err(e) => return Err(e),
|
|
}
|
|
}
|
|
}
|
|
} else if super_obj.sub_module_index() > 0 {
|
|
let sub_idx = super_obj.sub_module_index() as usize - 1;
|
|
if sub_idx >= self.sub_modules.len() {
|
|
return Err(format!(
|
|
"SUPER_CALL: sub_module_index {} out of bounds (max {})",
|
|
sub_idx,
|
|
self.sub_modules.len()
|
|
));
|
|
}
|
|
if self.frames.len() >= self.kernel_core.config.max_call_depth {
|
|
return Err(self.error_message_text("RangeError", "Maximum call stack size exceeded"));
|
|
}
|
|
|
|
let sub_bytecode = self.sub_modules[sub_idx].bytecode.clone();
|
|
let sub_n_args = self.sub_modules[sub_idx].n_args as usize;
|
|
let sub_n_registers = self.sub_modules[sub_idx].n_registers;
|
|
let sub_constants = self.sub_modules[sub_idx].constants.clone();
|
|
let sub_param_base = self.sub_modules[sub_idx].param_base as usize;
|
|
let caller_reg_limit = self.active_reg_limit.max(1);
|
|
let saved_regs = self.regs[..caller_reg_limit as usize].to_vec().into_boxed_slice();
|
|
let saved_this = self.regs[254];
|
|
let saved_new_target = self.regs[255];
|
|
|
|
for i in 0..sub_n_args {
|
|
let src_reg = first_arg_reg.wrapping_add(i as u8) as usize;
|
|
self.regs[sub_param_base + i] = self.regs[src_reg];
|
|
}
|
|
self.regs[254] = derived_this;
|
|
self.regs[255] = new_target;
|
|
|
|
let converted_sub_constants = self.convert_constants(&sub_constants)?;
|
|
self.saved_bytecode_stack.push(std::mem::take(&mut self.bytecode));
|
|
self.saved_constants_stack.push(std::mem::take(&mut self.constants));
|
|
self.frames.push(CallFrame {
|
|
return_addr: self.pc,
|
|
function_name: self.sub_modules[sub_idx]
|
|
.function_name
|
|
.as_deref()
|
|
.map(|name| self.kernel_core.string_forge().intern(name).0)
|
|
.unwrap_or(0),
|
|
caller_reg_limit,
|
|
saved_regs,
|
|
saved_this,
|
|
saved_new_target,
|
|
callee: super_ctor,
|
|
construct_result_reg: Some(254),
|
|
constructed_this: Some(derived_this),
|
|
is_derived_constructor: super_obj.is_derived_constructor(),
|
|
continuation: FrameContinuation::None,
|
|
});
|
|
|
|
self.bytecode = sub_bytecode;
|
|
self.constants = converted_sub_constants;
|
|
for (name, reg) in &self.sub_modules[sub_idx].builtin_reg_map {
|
|
let si = self.kernel_core.string_forge().intern(name.as_str()).0;
|
|
let global = self.session.global_object();
|
|
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(global.shape_id(), si) {
|
|
self.regs[*reg as usize] = global.get_prop_at(pos);
|
|
}
|
|
}
|
|
self.active_reg_limit = sub_n_registers.max(1);
|
|
self.pc = 0;
|
|
continue;
|
|
} else {
|
|
throw_err!(self, TypeError, "super constructor is not callable");
|
|
}
|
|
}
|
|
|
|
OpCode::SUPER_GET_PROP | OpCode::SUPER_STATIC_GET_PROP => {
|
|
let key_val = self.regs[b];
|
|
let prop_name_si = self.property_key_si(key_val);
|
|
let Some(frame) = self.frames.last() else {
|
|
throw_err!(self, ReferenceError, "super property used outside function");
|
|
};
|
|
if !frame.callee.is_object() {
|
|
throw_err!(self, ReferenceError, "super property has no home object");
|
|
}
|
|
let callee_obj = unsafe { &*frame.callee.as_js_object_ptr() };
|
|
let home_object = callee_obj.home_object();
|
|
if !home_object.is_object() {
|
|
throw_err!(self, ReferenceError, "super property has no home object");
|
|
}
|
|
let home_obj = unsafe { &*home_object.as_js_object_ptr() };
|
|
let super_base = home_obj.proto();
|
|
if !super_base.is_object() {
|
|
self.regs[rd] = JsValue::undefined();
|
|
} else {
|
|
let super_obj = unsafe { &*super_base.as_js_object_ptr() };
|
|
let val = self.ordinary_get_with_target(super_obj, prop_name_si, self.regs[a], rd as u8)?;
|
|
if self.accessor_frame_target_reg.take().is_none() {
|
|
self.regs[rd] = val;
|
|
}
|
|
}
|
|
}
|
|
|
|
OpCode::SET_HOME_OBJECT => {
|
|
let func_val = self.regs[rd];
|
|
let home_val = self.regs[a];
|
|
if !func_val.is_object() || !home_val.is_object() {
|
|
throw_err!(self, TypeError, "SET_HOME_OBJECT expects function and object");
|
|
}
|
|
let home_val = self.promote_if_needed_for_write_ptr(func_val.as_js_object_ptr(), home_val);
|
|
let func_obj = unsafe { &mut *func_val.as_js_object_ptr() };
|
|
if !func_obj.is_function() {
|
|
throw_err!(self, TypeError, "SET_HOME_OBJECT target is not a function");
|
|
}
|
|
func_obj.set_home_object(home_val);
|
|
}
|
|
|
|
OpCode::DEFINE_ACCESSOR => {
|
|
self.dispatch_define_accessor(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::RETURN => match self.dispatch_return(rd) {
|
|
Ok(Some(result)) => return Ok(result),
|
|
Ok(None) => {}
|
|
Err(e) => return Err(e),
|
|
},
|
|
|
|
OpCode::IC_GET_PROP
|
|
| OpCode::IC_SET_PROP
|
|
| OpCode::GET_PROP
|
|
| OpCode::SET_PROP
|
|
| OpCode::GET_PROP_DYNAMIC
|
|
| OpCode::SET_PROP_DYNAMIC
|
|
| OpCode::SET_ELEM
|
|
| OpCode::GET_PRIVATE
|
|
| OpCode::SET_PRIVATE
|
|
| OpCode::INIT_PRIVATE
|
|
| OpCode::PRIVATE_BRAND_IN => {
|
|
self.dispatch_property_op(op, rd, a, b)?;
|
|
}
|
|
|
|
OpCode::NEW_OBJECT => {
|
|
let proto_ptr = &*self.object_prototype as *const JsObject as *mut JsObject;
|
|
let obj = self
|
|
.epoch
|
|
.alloc(JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::from_js_object(proto_ptr)));
|
|
self.regs[rd] = JsValue::object(obj as *mut u8);
|
|
}
|
|
|
|
OpCode::NEW_ARRAY => {
|
|
let proto_ptr = self.session.builtin_world().array_proto.as_ptr() as *mut JsObject;
|
|
let n = opcode::imm16(instr) as usize;
|
|
let bump = self.epoch.bump();
|
|
let obj = self.alloc_object(JsObject::new_array(
|
|
EMPTY_SHAPE_ID,
|
|
JsValue::from_js_object(proto_ptr),
|
|
n,
|
|
bump,
|
|
));
|
|
self.regs[rd] = JsValue::object(obj as *mut u8);
|
|
}
|
|
|
|
OpCode::COMPOUND_ADD => {
|
|
let lhs = self.coerce_primitive_bounded(self.regs[rd], false)?;
|
|
let rhs = self.coerce_primitive_bounded(self.regs[a], false)?;
|
|
if lhs.is_string() || rhs.is_string() {
|
|
let ls = coercion::to_string(self.kernel_core.string_forge().as_ref(), lhs);
|
|
let rs = coercion::to_string(self.kernel_core.string_forge().as_ref(), rhs);
|
|
let concat = format!("{ls}{rs}");
|
|
self.regs[rd] = self.intern(&concat);
|
|
} else {
|
|
let ln = coercion::to_number(lhs, self.kernel_core.string_forge().as_ref());
|
|
let rn = coercion::to_number(rhs, self.kernel_core.string_forge().as_ref());
|
|
self.regs[rd] = JsValue::float(ln + rn);
|
|
}
|
|
}
|
|
|
|
OpCode::COMPOUND_SUB => {
|
|
compound_arith!(self, rd, a, -);
|
|
}
|
|
|
|
OpCode::COMPOUND_MUL => {
|
|
compound_arith!(self, rd, a, *);
|
|
}
|
|
|
|
OpCode::COMPOUND_DIV => {
|
|
compound_arith!(self, rd, a, /);
|
|
}
|
|
|
|
OpCode::COMPOUND_MOD => {
|
|
compound_arith!(self, rd, a, %);
|
|
}
|
|
|
|
OpCode::COMPOUND_EXP => {
|
|
let l = self.coerce_number_bounded(self.regs[rd])?;
|
|
let r = self.coerce_number_bounded(self.regs[a])?;
|
|
self.regs[rd] = JsValue::float(l.powf(r));
|
|
}
|
|
|
|
OpCode::COMPOUND_AND => {
|
|
self.dispatch_compound_bit_and(rd, a)?;
|
|
}
|
|
|
|
OpCode::COMPOUND_OR => {
|
|
self.dispatch_compound_bit_or(rd, a)?;
|
|
}
|
|
|
|
OpCode::COMPOUND_XOR => {
|
|
self.dispatch_compound_bit_xor(rd, a)?;
|
|
}
|
|
|
|
OpCode::COMPOUND_SHL => {
|
|
self.dispatch_compound_shl(rd, a)?;
|
|
}
|
|
|
|
OpCode::COMPOUND_SHR => {
|
|
self.dispatch_compound_shr(rd, a)?;
|
|
}
|
|
|
|
OpCode::COMPOUND_USHR => {
|
|
self.dispatch_compound_ushr(rd, a)?;
|
|
}
|
|
|
|
OpCode::TYPEOF => {
|
|
self.dispatch_typeof(rd, a);
|
|
}
|
|
|
|
OpCode::VOID => {
|
|
self.regs[rd] = JsValue::undefined();
|
|
}
|
|
|
|
OpCode::TEMPLATE_STR => {
|
|
self.dispatch_template_str(rd);
|
|
}
|
|
|
|
OpCode::DELETE_PROP_STATIC => {
|
|
let prop_idx = self.bytecode[self.pc] as usize;
|
|
self.pc += 1;
|
|
let key_val = self.constants.get(prop_idx).copied().unwrap_or_else(JsValue::undefined);
|
|
let prop_name_si = self.property_key_si(key_val);
|
|
let Some(obj_ptr) = self.checked_object_ptr(self.regs[rd], "delete on non-object")? else {
|
|
continue;
|
|
};
|
|
let obj = unsafe { &mut *obj_ptr };
|
|
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(obj.shape_id(), prop_name_si) {
|
|
obj.set_prop_at(pos, JsValue::undefined());
|
|
}
|
|
self.regs[rd] = JsValue::bool(true);
|
|
}
|
|
|
|
OpCode::DELETE_PROP_DYNAMIC => {
|
|
let prop_name_si = self.property_key_si(self.regs[b]);
|
|
let Some(obj_ptr) = self.checked_object_ptr(self.regs[rd], "delete on non-object")? else {
|
|
continue;
|
|
};
|
|
let obj = unsafe { &mut *obj_ptr };
|
|
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(obj.shape_id(), prop_name_si) {
|
|
obj.set_prop_at(pos, JsValue::undefined());
|
|
}
|
|
self.regs[rd] = JsValue::bool(true);
|
|
}
|
|
|
|
OpCode::INSTANCEOF => {
|
|
self.dispatch_instanceof(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::IN => {
|
|
self.dispatch_in(rd, a, b)?;
|
|
}
|
|
|
|
OpCode::NOT => {
|
|
self.dispatch_not(rd, a);
|
|
}
|
|
|
|
OpCode::AND => {
|
|
self.dispatch_and(rd, a, b);
|
|
}
|
|
|
|
OpCode::OR => {
|
|
self.dispatch_or(rd, a, b);
|
|
}
|
|
|
|
OpCode::NULLISH => {
|
|
self.dispatch_nullish(rd, a, b);
|
|
}
|
|
|
|
OpCode::INC_PRE => {
|
|
let n = self.coerce_number_bounded(self.regs[rd])?;
|
|
let result = JsValue::float(n + 1.0);
|
|
self.regs[rd] = result;
|
|
self.regs[a] = result;
|
|
}
|
|
|
|
OpCode::INC_POST => {
|
|
let n = self.coerce_number_bounded(self.regs[rd])?;
|
|
self.regs[a] = JsValue::float(n);
|
|
self.regs[rd] = JsValue::float(n + 1.0);
|
|
}
|
|
|
|
OpCode::DEC_PRE => {
|
|
let n = self.coerce_number_bounded(self.regs[rd])?;
|
|
let result = JsValue::float(n - 1.0);
|
|
self.regs[rd] = result;
|
|
self.regs[a] = result;
|
|
}
|
|
|
|
OpCode::DEC_POST => {
|
|
let n = self.coerce_number_bounded(self.regs[rd])?;
|
|
self.regs[a] = JsValue::float(n);
|
|
self.regs[rd] = JsValue::float(n - 1.0);
|
|
}
|
|
|
|
OpCode::MEMBER_INC
|
|
| OpCode::MEMBER_DEC
|
|
| OpCode::DYN_MEMBER_INC
|
|
| OpCode::DYN_MEMBER_DEC
|
|
| OpCode::COMPOUND_MEMBER_ADD
|
|
| OpCode::COMPOUND_MEMBER_SUB
|
|
| OpCode::COMPOUND_MEMBER_MUL
|
|
| OpCode::COMPOUND_MEMBER_DIV
|
|
| OpCode::COMPOUND_MEMBER_MOD
|
|
| OpCode::COMPOUND_MEMBER_EXP => {
|
|
self.dispatch_member_op(op, rd, a, b)?;
|
|
}
|
|
|
|
OpCode::FOR_IN_INIT => {
|
|
self.dispatch_for_in_init(a)?;
|
|
}
|
|
|
|
OpCode::FOR_IN_NEXT => {
|
|
self.dispatch_for_in_next(rd)?;
|
|
}
|
|
|
|
OpCode::FOR_IN_DONE => {
|
|
self.dispatch_for_in_done(rd);
|
|
}
|
|
|
|
OpCode::FOR_IN_CLEANUP => {
|
|
self.dispatch_for_in_cleanup();
|
|
}
|
|
|
|
OpCode::FOR_OF_INIT => {
|
|
self.dispatch_for_of_init(a)?;
|
|
}
|
|
|
|
OpCode::FOR_OF_NEXT => {
|
|
self.dispatch_for_of_next(rd)?;
|
|
}
|
|
|
|
OpCode::FOR_OF_DONE => {
|
|
self.dispatch_for_of_done(rd)?;
|
|
}
|
|
|
|
OpCode::FOR_OF_CLOSE => {
|
|
self.dispatch_for_of_close()?;
|
|
}
|
|
|
|
OpCode::REST_OBJECT => {
|
|
self.dispatch_rest_object(rd, a)?;
|
|
}
|
|
|
|
OpCode::THROW => match self.dispatch_throw(rd) {
|
|
Ok(true) => continue,
|
|
Ok(false) => {}
|
|
Err(e) => return Err(e),
|
|
},
|
|
|
|
OpCode::TRY_BEGIN => {
|
|
self.dispatch_try_begin(instr);
|
|
}
|
|
|
|
OpCode::TRY_END => {
|
|
self.dispatch_try_end();
|
|
}
|
|
|
|
OpCode::TRY_FINALLY_BEGIN => {
|
|
self.dispatch_try_finally_begin(instr);
|
|
}
|
|
|
|
OpCode::TRY_FINALLY_END => match self.dispatch_try_finally_end() {
|
|
Ok(true) => continue,
|
|
Ok(false) => {}
|
|
Err(e) => return Err(e),
|
|
},
|
|
|
|
_ => {
|
|
return Err(format!("opcode {op} not yet implemented"));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Default for Vm {
|
|
fn default() -> Self {
|
|
Self::new()
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::{opcode, JsValue, TryHandler, Vm};
|
|
use crate::native::NativeResult;
|
|
use oxide_bytecode::module::{CompiledModule, Constant};
|
|
use oxide_types::object::NativeFnPtr;
|
|
use oxide_types::object::{JsObject, PropAttributes};
|
|
|
|
fn native_return_7(_vm: &mut Vm, _args: &[u8]) -> NativeResult {
|
|
NativeResult::Ok(JsValue::int(7))
|
|
}
|
|
|
|
fn native_get_marker(vm: &mut Vm, args: &[u8]) -> NativeResult {
|
|
let this_val = vm.reg(args[0]);
|
|
if !this_val.is_object() {
|
|
return NativeResult::Ok(JsValue::undefined());
|
|
}
|
|
let marker_si = vm.kernel_core.string_forge().intern("marker").0;
|
|
let obj = unsafe { &*this_val.as_js_object_ptr() };
|
|
NativeResult::Ok(vm.resolve_property(obj, marker_si).unwrap_or(JsValue::undefined()))
|
|
}
|
|
|
|
fn native_set_marker(vm: &mut Vm, args: &[u8]) -> NativeResult {
|
|
let this_val = vm.reg(args[0]);
|
|
let value = vm.reg(args[1]);
|
|
if !this_val.is_object() {
|
|
return NativeResult::Ok(JsValue::undefined());
|
|
}
|
|
let marker_si = vm.kernel_core.string_forge().intern("marker").0;
|
|
let obj = unsafe { &mut *this_val.as_js_object_ptr() };
|
|
vm.set_or_create_prop_value(obj, marker_si, value);
|
|
NativeResult::Ok(JsValue::undefined())
|
|
}
|
|
|
|
fn native_return_last_arg(vm: &mut Vm, args: &[u8]) -> NativeResult {
|
|
let reg = *args.last().expect("receiver + args");
|
|
NativeResult::Ok(vm.reg(reg))
|
|
}
|
|
|
|
fn native_return_arg_count(_vm: &mut Vm, args: &[u8]) -> NativeResult {
|
|
NativeResult::Ok(JsValue::int(args.len().saturating_sub(1) as i32))
|
|
}
|
|
|
|
fn native_function(vm: &mut Vm, f: crate::native::NativeFn) -> JsValue {
|
|
let proto = vm.session.builtin_world().function_proto.as_ptr() as *mut JsObject;
|
|
let mut obj = JsObject::new_empty(oxide_kernel::shape_forge::EMPTY_SHAPE_ID, JsValue::from_js_object(proto));
|
|
obj.set_function(true);
|
|
// SAFETY: f is a NativeFn fn-item; valid to store as NativeFnPtr.
|
|
obj.set_native_fn(Some(unsafe { NativeFnPtr::from_raw(f as *const ()) }));
|
|
JsValue::object(vm.alloc_object(obj) as *mut u8)
|
|
}
|
|
|
|
fn plain_object(vm: &mut Vm) -> JsValue {
|
|
let proto = vm.session.builtin_world().object_proto.as_ptr() as *mut JsObject;
|
|
let obj = JsObject::new_empty(oxide_kernel::shape_forge::EMPTY_SHAPE_ID, JsValue::from_js_object(proto));
|
|
JsValue::object(vm.alloc_object(obj) as *mut u8)
|
|
}
|
|
|
|
fn add_accessor(vm: &mut Vm, obj_val: JsValue, name: &str, get: JsValue, set: JsValue) {
|
|
let si = vm.kernel_core.string_forge().intern(name).0;
|
|
let obj = unsafe { &mut *obj_val.as_js_object_ptr() };
|
|
let shape_id = vm.kernel_core.shape_forge().make_shape(obj.shape_id(), si);
|
|
obj.set_shape_id(shape_id);
|
|
let pos = obj.push_prop(JsValue::undefined());
|
|
obj.set_accessor_meta(pos, get, set, PropAttributes::DEFAULT_DATA);
|
|
obj.bump_generation();
|
|
}
|
|
|
|
fn set_data(vm: &mut Vm, obj_val: JsValue, name: &str, val: JsValue) {
|
|
let si = vm.kernel_core.string_forge().intern(name).0;
|
|
let obj = unsafe { &mut *obj_val.as_js_object_ptr() };
|
|
vm.set_or_create_prop_value(obj, si, val);
|
|
}
|
|
|
|
#[test]
|
|
fn reset_clears_runtime_state_like_rerun() {
|
|
let mut vm = Vm::new();
|
|
vm.regs[1] = JsValue::int(7);
|
|
vm.pc = 3;
|
|
vm.frames.push(super::CallFrame {
|
|
return_addr: 1,
|
|
function_name: 0,
|
|
caller_reg_limit: 2,
|
|
saved_regs: vec![JsValue::undefined()].into_boxed_slice(),
|
|
saved_this: JsValue::undefined(),
|
|
saved_new_target: JsValue::undefined(),
|
|
callee: JsValue::undefined(),
|
|
construct_result_reg: None,
|
|
constructed_this: None,
|
|
is_derived_constructor: false,
|
|
continuation: super::FrameContinuation::None,
|
|
});
|
|
vm.for_in_iters.push(std::ptr::dangling_mut::<super::ForInIter<'static>>());
|
|
vm.for_of_iters.push(JsValue::undefined());
|
|
vm.saved_bytecode_stack
|
|
.push(vec![opcode::encode(opcode::OpCode::HALT, 0, 0, 0)]);
|
|
vm.saved_constants_stack.push(vec![JsValue::int(1)]);
|
|
vm.try_stack.push(TryHandler {
|
|
catch_pc: Some(1),
|
|
finally_pc: None,
|
|
frame_depth: 0,
|
|
});
|
|
vm.exception_value = Some(JsValue::int(2));
|
|
vm.pending_exception = Some(JsValue::int(3));
|
|
vm.pending_error_kind = Some("TypeError");
|
|
|
|
vm.reset();
|
|
|
|
assert_eq!(vm.pc, 0);
|
|
assert!(vm.frames.is_empty());
|
|
assert!(vm.for_in_iters.is_empty());
|
|
assert!(vm.for_of_iters.is_empty());
|
|
assert!(vm.saved_bytecode_stack.is_empty());
|
|
assert!(vm.saved_constants_stack.is_empty());
|
|
assert!(vm.try_stack.is_empty());
|
|
assert!(vm.exception_value.is_none());
|
|
assert!(vm.pending_exception.is_none());
|
|
assert!(vm.pending_error_kind.is_none());
|
|
assert!(vm.bytecode.is_empty());
|
|
assert!(vm.constants.is_empty());
|
|
}
|
|
|
|
#[test]
|
|
fn full_reset_clears_symbol_state() {
|
|
let mut vm = Vm::new();
|
|
vm.symbol_counter = 1;
|
|
vm.symbol_descriptions.push("shared".to_string());
|
|
vm.symbol_registry.insert("shared".to_string(), 0);
|
|
|
|
vm.full_reset();
|
|
|
|
assert_eq!(vm.symbol_counter, 0);
|
|
assert!(vm.symbol_descriptions.is_empty());
|
|
assert!(vm.symbol_registry.is_empty());
|
|
}
|
|
|
|
#[test]
|
|
fn for_of_close_pops_iterator_stack() {
|
|
let module = CompiledModule {
|
|
bytecode: vec![
|
|
opcode::encode(opcode::OpCode::FOR_OF_CLOSE, 0, 0, 0),
|
|
opcode::encode(opcode::OpCode::HALT, 0, 0, 0),
|
|
],
|
|
n_registers: 1,
|
|
..CompiledModule::new()
|
|
};
|
|
let mut vm = Vm::new();
|
|
vm.for_of_iters.push(JsValue::undefined());
|
|
|
|
vm.run(&module).expect("FOR_OF_CLOSE should tolerate non-object sentinel");
|
|
|
|
assert!(vm.for_of_iters.is_empty());
|
|
}
|
|
|
|
#[test]
|
|
fn invalid_regexp_constant_fails_explicitly() {
|
|
let module = CompiledModule {
|
|
constants: vec![Constant::RegExp("[".into(), "".into())],
|
|
bytecode: vec![opcode::encode(opcode::OpCode::HALT, 0, 0, 0)],
|
|
n_registers: 1,
|
|
..CompiledModule::new()
|
|
};
|
|
let mut vm = Vm::new();
|
|
let err = vm.run(&module).expect_err("invalid RegExp constant should fail explicitly");
|
|
assert!(err.contains("SyntaxError: Invalid regular expression"), "unexpected error: {err}");
|
|
}
|
|
|
|
#[test]
|
|
fn invalid_regexp_constant_in_submodule_fails_explicitly() {
|
|
let submodule = CompiledModule {
|
|
constants: vec![Constant::RegExp("[".into(), "".into())],
|
|
bytecode: vec![opcode::encode(opcode::OpCode::RETURN, 0, 0, 0)],
|
|
n_registers: 1,
|
|
..CompiledModule::new()
|
|
};
|
|
let module = CompiledModule {
|
|
constants: vec![Constant::BytecodeFunc(1), Constant::Undefined],
|
|
bytecode: vec![
|
|
opcode::encode(opcode::OpCode::LOAD_CONST, 0, 0, 0),
|
|
opcode::encode(opcode::OpCode::LOAD_CONST, 1, 1, 0),
|
|
opcode::encode(opcode::OpCode::CALL, 0, 1, 0),
|
|
0,
|
|
opcode::encode(opcode::OpCode::HALT, 0, 0, 0),
|
|
],
|
|
n_registers: 2,
|
|
sub_modules: vec![submodule],
|
|
..CompiledModule::new()
|
|
};
|
|
let mut vm = Vm::new();
|
|
let err = vm
|
|
.run(&module)
|
|
.expect_err("invalid submodule RegExp constant should fail explicitly");
|
|
assert!(err.contains("SyntaxError: Invalid regular expression"), "unexpected error: {err}");
|
|
}
|
|
|
|
#[test]
|
|
fn write_ic_back_updates_three_extension_words() {
|
|
let mut vm = Vm::new();
|
|
vm.bytecode = vec![0, 0, 0];
|
|
vm.pc = 3;
|
|
vm.write_ic_back(0x1234_5678, 7);
|
|
assert_eq!(vm.bytecode[0], 0x0034_5678);
|
|
assert_eq!(vm.bytecode[1], 7);
|
|
assert_eq!(vm.bytecode[2], 0);
|
|
}
|
|
|
|
#[test]
|
|
fn unimplemented_profile_opcode_fails_explicitly() {
|
|
let module = CompiledModule {
|
|
bytecode: vec![
|
|
opcode::encode(opcode::OpCode::PROFILE_TYPE, 0, 0, 0),
|
|
opcode::encode(opcode::OpCode::HALT, 0, 0, 0),
|
|
],
|
|
n_registers: 1,
|
|
..CompiledModule::new()
|
|
};
|
|
let mut vm = Vm::new();
|
|
let err = vm.run(&module).expect_err("unimplemented opcode should fail explicitly");
|
|
assert_eq!(err, "opcode PROFILE_TYPE not yet implemented");
|
|
}
|
|
|
|
#[test]
|
|
fn ordinary_get_calls_own_native_getter() {
|
|
let mut vm = Vm::new();
|
|
let obj_val = plain_object(&mut vm);
|
|
let getter = native_function(&mut vm, native_return_7);
|
|
add_accessor(&mut vm, obj_val, "x", getter, JsValue::undefined());
|
|
|
|
let x_si = vm.kernel_core.string_forge().intern("x").0;
|
|
let obj = unsafe { &*obj_val.as_js_object_ptr() };
|
|
let value = vm.ordinary_get(obj, x_si, obj_val).expect("getter");
|
|
assert_eq!(value, JsValue::int(7));
|
|
}
|
|
|
|
#[test]
|
|
fn ordinary_set_calls_own_native_setter() {
|
|
let mut vm = Vm::new();
|
|
let obj_val = plain_object(&mut vm);
|
|
let setter = native_function(&mut vm, native_set_marker);
|
|
add_accessor(&mut vm, obj_val, "x", JsValue::undefined(), setter);
|
|
|
|
let x_si = vm.kernel_core.string_forge().intern("x").0;
|
|
let obj = unsafe { &mut *obj_val.as_js_object_ptr() };
|
|
vm.ordinary_set(obj, x_si, JsValue::int(9), obj_val).expect("setter");
|
|
|
|
let marker_si = vm.kernel_core.string_forge().intern("marker").0;
|
|
let obj = unsafe { &*obj_val.as_js_object_ptr() };
|
|
assert_eq!(vm.resolve_property(obj, marker_si), Some(JsValue::int(9)));
|
|
}
|
|
|
|
#[test]
|
|
fn inherited_getter_uses_original_receiver() {
|
|
let mut vm = Vm::new();
|
|
let proto_val = plain_object(&mut vm);
|
|
let child_val = plain_object(&mut vm);
|
|
let getter = native_function(&mut vm, native_get_marker);
|
|
add_accessor(&mut vm, proto_val, "x", getter, JsValue::undefined());
|
|
set_data(&mut vm, child_val, "marker", JsValue::int(42));
|
|
unsafe {
|
|
(*child_val.as_js_object_ptr()).set_proto(proto_val).expect("proto");
|
|
}
|
|
|
|
let x_si = vm.kernel_core.string_forge().intern("x").0;
|
|
let child = unsafe { &*child_val.as_js_object_ptr() };
|
|
let value = vm.ordinary_get(child, x_si, child_val).expect("getter");
|
|
assert_eq!(value, JsValue::int(42));
|
|
}
|
|
|
|
#[test]
|
|
fn inherited_setter_uses_original_receiver() {
|
|
let mut vm = Vm::new();
|
|
let proto_val = plain_object(&mut vm);
|
|
let child_val = plain_object(&mut vm);
|
|
let setter = native_function(&mut vm, native_set_marker);
|
|
add_accessor(&mut vm, proto_val, "x", JsValue::undefined(), setter);
|
|
unsafe {
|
|
(*child_val.as_js_object_ptr()).set_proto(proto_val).expect("proto");
|
|
}
|
|
|
|
let x_si = vm.kernel_core.string_forge().intern("x").0;
|
|
let child = unsafe { &mut *child_val.as_js_object_ptr() };
|
|
vm.ordinary_set(child, x_si, JsValue::int(12), child_val).expect("setter");
|
|
|
|
let marker_si = vm.kernel_core.string_forge().intern("marker").0;
|
|
let child = unsafe { &*child_val.as_js_object_ptr() };
|
|
let proto = unsafe { &*proto_val.as_js_object_ptr() };
|
|
assert_eq!(vm.resolve_property(child, marker_si), Some(JsValue::int(12)));
|
|
assert_eq!(vm.resolve_property(proto, marker_si), None);
|
|
}
|
|
|
|
#[test]
|
|
fn deep_inherited_setter_uses_original_receiver() {
|
|
let mut vm = Vm::new();
|
|
let grand_proto_val = plain_object(&mut vm);
|
|
let proto_val = plain_object(&mut vm);
|
|
let child_val = plain_object(&mut vm);
|
|
let setter = native_function(&mut vm, native_set_marker);
|
|
add_accessor(&mut vm, grand_proto_val, "x", JsValue::undefined(), setter);
|
|
unsafe {
|
|
(*proto_val.as_js_object_ptr()).set_proto(grand_proto_val).expect("proto");
|
|
(*child_val.as_js_object_ptr()).set_proto(proto_val).expect("proto");
|
|
}
|
|
|
|
let x_si = vm.kernel_core.string_forge().intern("x").0;
|
|
let child = unsafe { &mut *child_val.as_js_object_ptr() };
|
|
vm.ordinary_set(child, x_si, JsValue::int(15), child_val).expect("setter");
|
|
|
|
let marker_si = vm.kernel_core.string_forge().intern("marker").0;
|
|
let child = unsafe { &*child_val.as_js_object_ptr() };
|
|
assert_eq!(vm.resolve_property(child, marker_si), Some(JsValue::int(15)));
|
|
}
|
|
|
|
#[test]
|
|
fn ordinary_data_property_still_reads_and_writes_without_meta() {
|
|
let mut vm = Vm::new();
|
|
let obj_val = plain_object(&mut vm);
|
|
set_data(&mut vm, obj_val, "x", JsValue::int(1));
|
|
|
|
let x_si = vm.kernel_core.string_forge().intern("x").0;
|
|
let obj = unsafe { &mut *obj_val.as_js_object_ptr() };
|
|
assert!(!obj.has_prop_meta());
|
|
assert_eq!(vm.ordinary_get(obj, x_si, obj_val).expect("get"), JsValue::int(1));
|
|
vm.ordinary_set(obj, x_si, JsValue::int(2), obj_val).expect("set");
|
|
assert_eq!(vm.ordinary_get(obj, x_si, obj_val).expect("get"), JsValue::int(2));
|
|
}
|
|
|
|
#[test]
|
|
fn call_function_sync_passes_high_arity_native_args_without_truncation() {
|
|
let mut vm = Vm::new();
|
|
let callee = native_function(&mut vm, native_return_last_arg);
|
|
let args: Vec<JsValue> = (0..20).map(JsValue::int).collect();
|
|
|
|
let result = vm
|
|
.call_function_sync(callee, JsValue::undefined(), &args)
|
|
.expect("high-arity sync call should succeed");
|
|
|
|
assert_eq!(result, JsValue::int(19));
|
|
}
|
|
|
|
#[test]
|
|
fn call_function_sync_reports_actual_native_arg_count() {
|
|
let mut vm = Vm::new();
|
|
let callee = native_function(&mut vm, native_return_arg_count);
|
|
let args: Vec<JsValue> = (0..32).map(JsValue::int).collect();
|
|
|
|
let result = vm
|
|
.call_function_sync(callee, JsValue::undefined(), &args)
|
|
.expect("arg count should be preserved");
|
|
|
|
assert_eq!(result, JsValue::int(32));
|
|
}
|
|
|
|
#[test]
|
|
fn call_function_sync_rejects_unrepresentable_native_arity_without_register_corruption() {
|
|
let mut vm = Vm::new();
|
|
let callee = native_function(&mut vm, native_return_arg_count);
|
|
vm.set_reg(1, JsValue::int(7));
|
|
vm.set_reg(253, JsValue::int(11));
|
|
vm.set_reg(254, JsValue::int(12));
|
|
vm.set_reg(255, JsValue::int(13));
|
|
|
|
let args = vec![JsValue::undefined(); Vm::SYNC_NATIVE_ARG_LIMIT + 1];
|
|
let err = vm
|
|
.call_function_sync(callee, JsValue::undefined(), &args)
|
|
.expect_err("too many args should fail cleanly");
|
|
|
|
assert!(err.contains("at most 253 arguments"), "unexpected error: {err}");
|
|
assert_eq!(vm.reg(1), JsValue::int(7));
|
|
assert_eq!(vm.reg(253), JsValue::int(11));
|
|
assert_eq!(vm.reg(254), JsValue::int(12));
|
|
assert_eq!(vm.reg(255), JsValue::int(13));
|
|
}
|
|
}
|