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wasm: Add support for Expr::Reuse

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Brian Carroll 2022-03-20 23:01:54 +00:00
parent 5de539b9fa
commit 1f82310832
1 changed files with 17 additions and 6 deletions
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23
compiler/gen_wasm/src/backend.rs
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@ -580,7 +580,7 @@ impl<'a> WasmBackend<'a> {
tag_id, tag_id,
arguments, arguments,
.. ..
} => self.expr_tag(union_layout, *tag_id, arguments, sym, storage), } => self.expr_tag(union_layout, *tag_id, arguments, sym, storage, None),
Expr::GetTagId { Expr::GetTagId {
structure, structure,
@ -598,9 +598,13 @@ impl<'a> WasmBackend<'a> {
todo!("Expression `{}`", expr.to_pretty(100)) todo!("Expression `{}`", expr.to_pretty(100))
} }
Expr::Reuse { .. } => { Expr::Reuse {
todo!("Expression `{}`", expr.to_pretty(100)) tag_layout,
} tag_id,
arguments,
symbol: reused,
..
} => self.expr_tag(tag_layout, *tag_id, arguments, sym, storage, Some(*reused)),
Expr::Reset { symbol: arg, .. } => self.expr_reset(*arg, sym, storage), Expr::Reset { symbol: arg, .. } => self.expr_reset(*arg, sym, storage),
@ -1082,6 +1086,7 @@ impl<'a> WasmBackend<'a> {
arguments: &'a [Symbol], arguments: &'a [Symbol],
symbol: Symbol, symbol: Symbol,
stored: &StoredValue, stored: &StoredValue,
maybe_reused: Option<Symbol>,
) { ) {
if union_layout.tag_is_null(tag_id) { if union_layout.tag_is_null(tag_id) {
self.code_builder.i32_const(0); self.code_builder.i32_const(0);
@ -1102,8 +1107,14 @@ impl<'a> WasmBackend<'a> {
location.local_and_offset(self.storage.stack_frame_pointer) location.local_and_offset(self.storage.stack_frame_pointer)
} }
StoredValue::Local { local_id, .. } => { StoredValue::Local { local_id, .. } => {
// Tag is stored as a pointer to the heap. Call the allocator to get a memory address. // Tag is stored as a heap pointer.
self.allocate_with_refcount(Some(data_size), data_alignment, 1); if let Some(reused) = maybe_reused {
// Reuse an existing heap allocation
self.storage.load_symbols(&mut self.code_builder, &[reused]);
} else {
// Call the allocator to get a memory address.
self.allocate_with_refcount(Some(data_size), data_alignment, 1);
}
self.code_builder.set_local(local_id); self.code_builder.set_local(local_id);
(local_id, 0) (local_id, 0)
} }