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Merge remote-tracking branch 'origin/main' into expect-fx-codegen

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Folkert 2022-08-23 16:28:21 +02:00
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18
crates/compiler/gen_wasm/src/backend.rs
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@ -517,7 +517,7 @@ impl<'a> WasmBackend<'a> {
// Load all the arguments for the inner function
for (i, wrapper_arg) in wrapper_arg_layouts.iter().enumerate() {
let is_closure_data = i == 0; // Skip closure data (first for wrapper, last for inner)
let is_closure_data = i == 0; // Skip closure data (first for wrapper, last for inner). We'll handle it below.
let is_return_pointer = i == wrapper_arg_layouts.len() - 1; // Skip return pointer (may not be an arg for inner. And if it is, swaps from end to start)
if is_closure_data || is_return_pointer {
continue;
@ -540,7 +540,23 @@ 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 a
// one-element struct.
let inner_closure_data_layout = match closure_data_layout {
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);
}
// Call the wrapped inner function