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use crate::regexp::RegExpIndex;
use crate::scope::ScopeIndex;
use crate::script::ScriptStencilIndex;
use ast::source_atom_set::SourceAtomSetIndex;
/// Corresponds to js::frontend::GCThingList::ListType
/// in m-c/js/src/frontend/BytecodeSection.h.
#[derive(Debug)]
pub enum GCThing {
Null,
Atom(SourceAtomSetIndex),
Function(ScriptStencilIndex),
RegExp(RegExpIndex),
Scope(ScopeIndex),
}
/// Index into GCThingList.things.
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct GCThingIndex {
index: usize,
}
impl GCThingIndex {
fn new(index: usize) -> Self {
Self { index }
}
}
impl From<GCThingIndex> for usize {
fn from(index: GCThingIndex) -> usize {
index.index
}
}
/// List of GC things.
///
/// Maps to JSScript::gcthings() in js/src/vm/JSScript.h.
#[derive(Debug)]
pub struct GCThingList {
things: Vec<GCThing>,
}
impl GCThingList {
pub fn new() -> Self {
Self { things: Vec::new() }
}
pub fn push_atom(&mut self, atom_index: SourceAtomSetIndex) -> GCThingIndex {
let index = self.things.len();
self.things.push(GCThing::Atom(atom_index));
GCThingIndex::new(index)
}
pub fn push_function(&mut self, fun_index: ScriptStencilIndex) -> GCThingIndex {
let index = self.things.len();
self.things.push(GCThing::Function(fun_index));
GCThingIndex::new(index)
}
pub fn push_regexp(&mut self, regexp_index: RegExpIndex) -> GCThingIndex {
let index = self.things.len();
self.things.push(GCThing::RegExp(regexp_index));
GCThingIndex::new(index)
}
pub fn push_scope(&mut self, scope_index: ScopeIndex) -> GCThingIndex {
let index = self.things.len();
self.things.push(GCThing::Scope(scope_index));
GCThingIndex::new(index)
}
}
impl From<GCThingList> for Vec<GCThing> {
fn from(list: GCThingList) -> Vec<GCThing> {
list.things
}
}