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Add support for Zig/LLVM "fast calling convention"

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This commit is contained in:
Brian Carroll 2021-11-15 19:20:16 +00:00
parent 8ad2f13ba9
commit e9f920827e
5 changed files with 205 additions and 122 deletions
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32
compiler/gen_wasm/src/backend.rs
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@ -444,6 +444,13 @@ impl<'a> WasmBackend<'a> {
Ok(())
}
Stmt::Refcounting(_modify, following) => {
// TODO: actually deal with refcounting. For hello world, we just skipped it.
self.build_stmt(following, ret_layout)?;
Ok(())
}
x => Err(format!("statement not yet implemented: {:?}", x)),
}
}
@ -558,7 +565,8 @@ impl<'a> WasmBackend<'a> {
arguments: &'a [Symbol],
return_layout: WasmLayout,
) -> Result<(), String> {
self.storage.load_symbols(&mut self.code_builder, arguments);
self.storage
.load_symbols_fastcc(&mut self.code_builder, arguments, &return_layout);
let build_result = decode_low_level(
&mut self.code_builder,
@ -764,11 +772,27 @@ impl<'a> WasmBackend<'a> {
},
None => {
let mut param_types = Vec::with_capacity_in(arguments.len(), self.env.arena);
param_types.extend(arguments.iter().map(|a| self.storage.get(a).value_type()));
let mut param_types = Vec::with_capacity_in(1 + arguments.len(), self.env.arena);
let ret_type = if ret_layout.is_stack_memory() {
param_types.push(ValueType::I32);
None
} else {
Some(ret_layout.value_type())
};
for arg in arguments {
param_types.push(match self.storage.get(arg) {
StoredValue::StackMemory { size, .. } if *size > 4 && *size <= 8 => {
ValueType::I64
}
_ => ValueType::I32,
});
}
let signature_index = self.module.types.insert(Signature {
param_types,
ret_type: Some(ret_layout.value_type()), // TODO: handle builtins with no return value
ret_type,
});
let import_index = self.module.import.entries.len() as u32;