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core/codegen: Handle vararg in function generation

This commit is contained in:
David Mak 2024-07-16 19:36:08 +08:00
parent f5fb504a15
commit fac60c3974
1 changed files with 13 additions and 3 deletions
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16
nac3core/src/codegen/mod.rs
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@ -743,7 +743,10 @@ pub fn gen_func_impl<
let has_sret = ret_type.map_or(false, |ty| need_sret(ty)); let has_sret = ret_type.map_or(false, |ty| need_sret(ty));
let mut params = args let mut params = args
.iter() .iter()
.filter(|arg| !arg.is_vararg)
.map(|arg| { .map(|arg| {
debug_assert!(!arg.is_vararg);
get_llvm_abi_type( get_llvm_abi_type(
context, context,
&module, &module,
@ -762,9 +765,12 @@ pub fn gen_func_impl<
params.insert(0, ret_type.unwrap().ptr_type(AddressSpace::default()).into()); params.insert(0, ret_type.unwrap().ptr_type(AddressSpace::default()).into());
} }
debug_assert!(matches!(args.iter().filter(|arg| arg.is_vararg).count(), 0..=1));
let vararg_arg = args.iter().find(|arg| arg.is_vararg);
let fn_type = match ret_type { let fn_type = match ret_type {
Some(ret_type) if !has_sret => ret_type.fn_type(&params, false), Some(ret_type) if !has_sret => ret_type.fn_type(&params, vararg_arg.is_some()),
_ => context.void_type().fn_type(&params, false), _ => context.void_type().fn_type(&params, vararg_arg.is_some()),
}; };
let symbol = &task.symbol_name; let symbol = &task.symbol_name;
@ -794,7 +800,9 @@ pub fn gen_func_impl<
let mut var_assignment = HashMap::new(); let mut var_assignment = HashMap::new();
let offset = u32::from(has_sret); let offset = u32::from(has_sret);
for (n, arg) in args.iter().enumerate() {
// Store non-vararg argument values into local variables
for (n, arg) in args.iter().enumerate().filter(|(_, arg)| !arg.is_vararg) {
let param = fn_val.get_nth_param((n as u32) + offset).unwrap(); let param = fn_val.get_nth_param((n as u32) + offset).unwrap();
let local_type = get_llvm_type( let local_type = get_llvm_type(
context, context,
@ -827,6 +835,8 @@ pub fn gen_func_impl<
var_assignment.insert(arg.name, (alloca, None, 0)); var_assignment.insert(arg.name, (alloca, None, 0));
} }
// TODO: Save vararg parameters as list
let return_buffer = if has_sret { let return_buffer = if has_sret {
Some(fn_val.get_nth_param(0).unwrap().into_pointer_value()) Some(fn_val.get_nth_param(0).unwrap().into_pointer_value())
} else { } else {