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Fix gen_wasm Let statement for heap-allocating expressions

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When we allocate on the heap we'll need to force LocalId storage.
In that case we don't want CodeBuilder to track the Symbol,
even though it has WasmLayout::Primitive.
So basically it was always the wrong condition to check, but we
got away with it when we had no heap allocations.
This commit is contained in:
Brian Carroll 2021-12-07 23:07:27 +00:00
parent 0220f7d921
commit 73c9c7089a
1 changed files with 8 additions and 14 deletions
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22
compiler/gen_wasm/src/backend.rs
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@ -296,18 +296,12 @@ impl<'a> WasmBackend<'a> {
self.build_expr(sym, expr, layout, &sym_storage)?;
// For primitives, we record that this symbol is at the top of the VM stack
// (For other values, we wrote to memory and there's nothing on the VM stack)
if let WasmLayout::Primitive(value_type, size) = wasm_layout {
let vm_state = self.code_builder.set_top_symbol(*sym);
self.storage.symbol_storage_map.insert(
*sym,
StoredValue::VirtualMachineStack {
vm_state,
value_type,
size,
},
);
// If this value is stored in the VM stack, we need code_builder to track it
// (since every instruction can change the VM stack)
if let Some(StoredValue::VirtualMachineStack { vm_state, .. }) =
self.storage.symbol_storage_map.get_mut(sym)
{
*vm_state = self.code_builder.set_top_symbol(*sym);
}
self.symbol_layouts.insert(*sym, *layout);
@ -854,14 +848,14 @@ impl<'a> WasmBackend<'a> {
// Not passing it as an argument because I'm trying to match Backend method signatures
let storage = self.storage.get(sym).to_owned();
if let Layout::Struct(field_layouts) = layout {
if matches!(layout, Layout::Struct(_)) {
match storage {
StoredValue::StackMemory { location, size, .. } => {
if size > 0 {
let (local_id, struct_offset) =
location.local_and_offset(self.storage.stack_frame_pointer);
let mut field_offset = struct_offset;
for (field, _) in fields.iter().zip(field_layouts.iter()) {
for field in fields.iter() {
field_offset += self.storage.copy_value_to_memory(
&mut self.code_builder,
local_id,