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Implement Expr::StructAtIndex for wasm dev backend

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This commit is contained in:
Brian Carroll 2021-11-14 19:06:04 +00:00
parent 4aa6ec1d64
commit 29d355c4d6
3 changed files with 97 additions and 13 deletions
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27
compiler/gen_wasm/src/backend.rs
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@ -22,8 +22,8 @@ use crate::wasm_module::{
LocalId, Signature, SymInfo, ValueType,
};
use crate::{
copy_memory, CopyMemoryConfig, Env, BUILTINS_IMPORT_MODULE_NAME, MEMORY_NAME, PTR_TYPE,
STACK_POINTER_GLOBAL_ID, STACK_POINTER_NAME,
copy_memory, CopyMemoryConfig, Env, BUILTINS_IMPORT_MODULE_NAME, MEMORY_NAME, PTR_SIZE,
PTR_TYPE, STACK_POINTER_GLOBAL_ID, STACK_POINTER_NAME,
};
/// The memory address where the constants data will be loaded during module instantiation.
@ -540,6 +540,29 @@ impl<'a> WasmBackend<'a> {
Expr::Struct(fields) => self.create_struct(sym, layout, fields),
Expr::StructAtIndex {
index,
field_layouts,
structure,
} => {
if let StoredValue::StackMemory { location, .. } = self.storage.get(structure) {
let (local_id, mut offset) =
location.local_and_offset(self.storage.stack_frame_pointer);
for field in field_layouts.iter().take(*index as usize) {
offset += field.stack_size(PTR_SIZE);
}
self.storage.copy_value_from_memory(
&mut self.code_builder,
*sym,
local_id,
offset,
);
} else {
unreachable!("Unexpected storage for {:?}", structure)
}
Ok(())
}
x => Err(format!("Expression is not yet implemented {:?}", x)),
}
}