Alek Ratzloff
3976b2135a
* VM Signals are used by running functions to dictate whether a function should return, or if it should call another function. These signals can be injected at any time allowing for user functions to inject themselves at runtime. * obj::Method is gone since it's not being used yet. * Obj impls must implement as_any(&self) -> &dyn Any now. This allows for UserFun and NativeFun to be explicitly cast (among other things, in the future). Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
49 lines
942 B
Rust
49 lines
942 B
Rust
use crate::obj::prelude::*;
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use shredder::{GcSafe, Scan, Scanner};
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/// A stack call frame.
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#[derive(Debug, Clone)]
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pub enum FrameKind {
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Native(NativeFunRef, Vec<ObjRef>),
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User {
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last_pc: usize,
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stack_base: usize,
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fun: UserFunRef,
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},
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}
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unsafe impl Scan for FrameKind {
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fn scan(&self, scanner: &mut Scanner<'_>) {
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match self {
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FrameKind::User { fun, .. } => scanner.scan(fun),
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_ => { /* no-op */ }
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}
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}
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}
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unsafe impl GcSafe for FrameKind {}
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#[derive(Scan, Debug, Clone)]
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pub struct Frame {
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locals: Names,
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kind: FrameKind,
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}
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impl Frame {
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pub fn new(locals: Names, kind: FrameKind) -> Self {
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Self { locals, kind, }
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}
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pub fn locals(&self) -> &Names {
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&self.locals
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}
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pub fn locals_mut(&mut self) -> &mut Names {
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&mut self.locals
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}
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pub fn kind(&self) -> &FrameKind {
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&self.kind
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}
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}
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