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Merge pull request #2301 from rtfeldman/wasm-refcount-list

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Wasm refcounting for lists
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Brian Carroll 2021-12-31 13:25:38 +00:00 • committed by GitHub
commit f767014f30
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8 changed files with 514 additions and 117 deletions
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13
compiler/gen_wasm/src/backend.rs
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@ -680,17 +680,13 @@ impl<'a> WasmBackend<'a> {
}
Expr::Array { elems, elem_layout } => {
if let StoredValue::StackMemory {
location,
alignment_bytes,
..
} = storage
{
if let StoredValue::StackMemory { location, .. } = storage {
let size = elem_layout.stack_size(PTR_SIZE) * (elems.len() as u32);
// Allocate heap space and store its address in a local variable
let heap_local_id = self.storage.create_anonymous_local(PTR_TYPE);
self.allocate_with_refcount(Some(size), *alignment_bytes, 1);
let heap_alignment = elem_layout.alignment_bytes(PTR_SIZE);
self.allocate_with_refcount(Some(size), heap_alignment, 1);
self.code_builder.set_local(heap_local_id);
let (stack_local_id, stack_offset) =
@ -1050,12 +1046,11 @@ impl<'a> WasmBackend<'a> {
// Save the allocation address to a temporary local variable
let local_id = self.storage.create_anonymous_local(ValueType::I32);
self.code_builder.set_local(local_id);
self.code_builder.tee_local(local_id);
// Write the initial refcount
let refcount_offset = extra_bytes - PTR_SIZE;
let encoded_refcount = (initial_refcount as i32) - 1 + i32::MIN;
self.code_builder.get_local(local_id);
self.code_builder.i32_const(encoded_refcount);
self.code_builder.i32_store(Align::Bytes4, refcount_offset);