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wasm: Get RC reset/reuse working correctly

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Brian Carroll 2022-08-05 18:29:36 +01:00
parent e71a6da62d
commit aa0e9e8d31
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3 changed files with 86 additions and 22 deletions
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17
crates/compiler/gen_wasm/src/backend.rs
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@ -1575,13 +1575,24 @@ impl<'a> WasmBackend<'a> {
StoredValue::Local { local_id, .. } => {
// Tag is stored as a heap pointer.
if let Some(reused) = maybe_reused {
// Reuse an existing heap allocation
// Reuse an existing heap allocation, if one is available (not NULL at runtime)
self.storage.load_symbols(&mut self.code_builder, &[reused]);
self.code_builder.if_();
{
self.storage.load_symbols(&mut self.code_builder, &[reused]);
self.code_builder.set_local(local_id);
}
self.code_builder.else_();
{
self.allocate_with_refcount(Some(data_size), data_alignment, 1);
self.code_builder.set_local(local_id);
}
self.code_builder.end();
} 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)
}
StoredValue::VirtualMachineStack { .. } => {
@ -1627,7 +1638,7 @@ impl<'a> WasmBackend<'a> {
self.code_builder.i64_store(id_align, id_offset);
}
}
} else if stores_tag_id_in_pointer {
} else if stores_tag_id_in_pointer && tag_id != 0 {
self.code_builder.get_local(local_id);
self.code_builder.i32_const(tag_id as i32);
self.code_builder.i32_or();