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wasm: store closure data passed to higher-order low-level in struct, not box

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Ayaz Hafiz 2022-08-17 16:33:03 -05:00
parent 1078badd58
commit b7c799702f
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2 changed files with 36 additions and 31 deletions
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11
crates/compiler/gen_wasm/src/backend.rs
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@ -540,15 +540,22 @@ impl<'a> WasmBackend<'a> {
// If the inner function has closure data, it's the last arg of the inner fn
let closure_data_layout = wrapper_arg_layouts[0];
if closure_data_layout.stack_size(TARGET_INFO) > 0 {
// The closure data exists, and will have been passed in to the wrapper as boxed.
// The closure data exists, and will have been passed in to the wrapper as a
// one-element struct.
let inner_closure_data_layout = match closure_data_layout {
Layout::Boxed(inner) => inner,
Layout::Struct {
field_layouts: [inner],
..
} => inner,
other => internal_error!(
"Expected a boxed layout for wrapped closure data, got {:?}",
other
),
};
self.code_builder.get_local(LocalId(0));
// Since the closure data is wrapped in a one-element struct, we've been passed in the
// pointer to that struct in the stack memory. To get the closure data we just need to
// dereference the pointer.
self.dereference_boxed_value(inner_closure_data_layout);
}