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use crate::ast::*;
use crate::resolve::gensym;
use std::mem;
pub fn run(fields: &mut Vec<ModuleField>) {
let mut cur = 0;
let mut to_append = Vec::new();
while cur < fields.len() {
let item = &mut fields[cur];
match item {
ModuleField::Func(f) => {
for name in f.exports.names.drain(..) {
to_append.push(export(f.span, name, ExportKind::Func, &mut f.id));
}
match f.kind {
FuncKind::Import(import) => {
*item = ModuleField::Import(Import {
span: f.span,
module: import.module,
field: import.field,
item: ItemSig {
span: f.span,
id: f.id,
name: f.name,
kind: ItemKind::Func(f.ty.clone()),
},
});
}
FuncKind::Inline { .. } => {}
}
}
ModuleField::Memory(m) => {
for name in m.exports.names.drain(..) {
to_append.push(export(m.span, name, ExportKind::Memory, &mut m.id));
}
match m.kind {
MemoryKind::Import { import, ty } => {
*item = ModuleField::Import(Import {
span: m.span,
module: import.module,
field: import.field,
item: ItemSig {
span: m.span,
id: m.id,
name: None,
kind: ItemKind::Memory(ty),
},
});
}
// If data is defined inline insert an explicit `data` module
// field here instead, switching this to a `Normal` memory.
MemoryKind::Inline { is_32, ref data } => {
let len = data.iter().map(|l| l.len()).sum::<usize>() as u32;
let pages = (len + page_size() - 1) / page_size();
let kind = MemoryKind::Normal(if is_32 {
MemoryType::B32 {
limits: Limits {
min: pages,
max: Some(pages),
},
shared: false,
}
} else {
MemoryType::B64 {
limits: Limits64 {
min: u64::from(pages),
max: Some(u64::from(pages)),
},
shared: false,
}
});
let data = match mem::replace(&mut m.kind, kind) {
MemoryKind::Inline { data, .. } => data,
_ => unreachable!(),
};
let id = gensym::fill(m.span, &mut m.id);
to_append.push(ModuleField::Data(Data {
span: m.span,
id: None,
kind: DataKind::Active {
memory: item_ref(kw::memory(m.span), id),
offset: Expression {
instrs: Box::new([Instruction::I32Const(0)]),
},
},
data,
}));
}
MemoryKind::Normal(_) => {}
}
}
ModuleField::Table(t) => {
for name in t.exports.names.drain(..) {
to_append.push(export(t.span, name, ExportKind::Table, &mut t.id));
}
match &mut t.kind {
TableKind::Import { import, ty } => {
*item = ModuleField::Import(Import {
span: t.span,
module: import.module,
field: import.field,
item: ItemSig {
span: t.span,
id: t.id,
name: None,
kind: ItemKind::Table(*ty),
},
});
}
// If data is defined inline insert an explicit `data` module
// field here instead, switching this to a `Normal` memory.
TableKind::Inline { payload, elem } => {
let len = match payload {
ElemPayload::Indices(v) => v.len(),
ElemPayload::Exprs { exprs, .. } => exprs.len(),
};
let kind = TableKind::Normal(TableType {
limits: Limits {
min: len as u32,
max: Some(len as u32),
},
elem: *elem,
});
let payload = match mem::replace(&mut t.kind, kind) {
TableKind::Inline { payload, .. } => payload,
_ => unreachable!(),
};
let id = gensym::fill(t.span, &mut t.id);
to_append.push(ModuleField::Elem(Elem {
span: t.span,
id: None,
kind: ElemKind::Active {
table: item_ref(kw::table(t.span), id),
offset: Expression {
instrs: Box::new([Instruction::I32Const(0)]),
},
},
payload,
}));
}
TableKind::Normal(_) => {}
}
}
ModuleField::Global(g) => {
for name in g.exports.names.drain(..) {
to_append.push(export(g.span, name, ExportKind::Global, &mut g.id));
}
match g.kind {
GlobalKind::Import(import) => {
*item = ModuleField::Import(Import {
span: g.span,
module: import.module,
field: import.field,
item: ItemSig {
span: g.span,
id: g.id,
name: None,
kind: ItemKind::Global(g.ty),
},
});
}
GlobalKind::Inline { .. } => {}
}
}
ModuleField::Event(e) => {
for name in e.exports.names.drain(..) {
to_append.push(export(e.span, name, ExportKind::Event, &mut e.id));
}
}
ModuleField::Instance(i) => {
for name in i.exports.names.drain(..) {
to_append.push(export(i.span, name, ExportKind::Instance, &mut i.id));
}
match &mut i.kind {
InstanceKind::Import { import, ty } => {
*item = ModuleField::Import(Import {
span: i.span,
module: import.module,
field: import.field,
item: ItemSig {
span: i.span,
id: i.id,
name: None,
kind: ItemKind::Instance(mem::replace(
ty,
TypeUse::new_with_index(Index::Num(0, Span::from_offset(0))),
)),
},
});
}
InstanceKind::Inline { .. } => {}
}
}
ModuleField::NestedModule(m) => {
for name in m.exports.names.drain(..) {
to_append.push(export(m.span, name, ExportKind::Module, &mut m.id));
}
match &mut m.kind {
NestedModuleKind::Import { import, ty } => {
*item = ModuleField::Import(Import {
span: m.span,
module: import.module,
field: import.field,
item: ItemSig {
span: m.span,
id: m.id,
name: m.name,
kind: ItemKind::Module(mem::replace(
ty,
TypeUse::new_with_index(Index::Num(0, Span::from_offset(0))),
)),
},
});
}
NestedModuleKind::Inline { fields, .. } => {
run(fields);
}
};
}
ModuleField::Import(_)
| ModuleField::Type(_)
| ModuleField::Export(_)
| ModuleField::Alias(_)
| ModuleField::Start(_)
| ModuleField::Elem(_)
| ModuleField::Data(_)
| ModuleField::Custom(_) => {}
}
fields.splice(cur..cur, to_append.drain(..));
cur += 1;
}
assert!(to_append.is_empty());
fn page_size() -> u32 {
1 << 16
}
}
fn export<'a>(
span: Span,
name: &'a str,
kind: ExportKind,
id: &mut Option<Id<'a>>,
) -> ModuleField<'a> {
let id = gensym::fill(span, id);
ModuleField::Export(Export {
span,
name,
index: item_ref(kind, id),
})
}
fn item_ref<'a, K>(kind: K, id: impl Into<Index<'a>>) -> ItemRef<'a, K> {
ItemRef::Item {
kind,
idx: id.into(),
exports: Vec::new(),
}
}