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Refactor abi.rs to make it easier to change the abi

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This commit is contained in:
bjorn3 2018-08-11 12:34:46 +02:00
parent dc323d7ffa
commit 419cbcbe2f
1 changed files with 162 additions and 51 deletions
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209
src/abi.rs
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@ -5,13 +5,53 @@ use rustc_target::spec::abi::Abi;
use crate::prelude::*;
#[derive(Debug)]
enum PassMode {
NoPass,
ByVal(Type),
ByRef,
}
impl PassMode {
fn get_param_ty(self, _fx: &FunctionCx) -> Type {
match self {
PassMode::NoPass => unimplemented!("pass mode nopass"),
PassMode::ByVal(cton_type) => cton_type,
PassMode::ByRef => types::I64,
}
}
}
fn get_pass_mode<'a, 'tcx: 'a>(
tcx: TyCtxt<'a, 'tcx, 'tcx>,
abi: Abi,
ty: Ty<'tcx>,
is_return: bool,
) -> PassMode {
if ty.sty == tcx.mk_nil().sty {
if is_return {
//if false {
PassMode::NoPass
} else {
PassMode::ByRef
}
} else if let Some(ret_ty) = crate::common::cton_type_from_ty(tcx, ty) {
PassMode::ByVal(ret_ty)
} else {
if abi == Abi::C {
unimplemented!("Non scalars are not yet supported for \"C\" abi");
}
PassMode::ByRef
}
}
pub fn cton_sig_from_fn_ty<'a, 'tcx: 'a>(
tcx: TyCtxt<'a, 'tcx, 'tcx>,
fn_ty: Ty<'tcx>,
) -> Signature {
let sig = ty_fn_sig(tcx, fn_ty);
assert!(!sig.variadic, "Variadic function are not yet supported");
let (call_conv, inputs, _output): (CallConv, Vec<Ty>, Ty) = match sig.abi {
let (call_conv, inputs, output): (CallConv, Vec<Ty>, Ty) = match sig.abi {
Abi::Rust => (CallConv::Fast, sig.inputs().to_vec(), sig.output()),
Abi::C => (CallConv::SystemV, sig.inputs().to_vec(), sig.output()),
Abi::RustCall => {
@ -34,21 +74,35 @@ pub fn cton_sig_from_fn_ty<'a, 'tcx: 'a>(
Abi::RustIntrinsic => (CallConv::SystemV, sig.inputs().to_vec(), sig.output()),
_ => unimplemented!("unsupported abi {:?}", sig.abi),
};
let inputs = inputs
.into_iter()
.filter_map(|ty| match get_pass_mode(tcx, sig.abi, ty, false) {
PassMode::ByVal(cton_ty) => Some(cton_ty),
PassMode::NoPass => unimplemented!("pass mode nopass"),
PassMode::ByRef => Some(types::I64),
});
let (params, returns) = match get_pass_mode(tcx, sig.abi, output, true) {
PassMode::NoPass => (inputs.map(AbiParam::new).collect(), vec![]),
PassMode::ByVal(ret_ty) => (
inputs.map(AbiParam::new).collect(),
vec![AbiParam::new(ret_ty)],
),
PassMode::ByRef => {
(
Some(types::I64).into_iter() // First param is place to put return val
.chain(inputs)
.map(AbiParam::new)
.collect(),
vec![],
)
}
};
Signature {
params: Some(types::I64).into_iter() // First param is place to put return val
.chain(inputs.into_iter().map(|ty| {
let cton_ty = cton_type_from_ty(tcx, ty);
if let Some(cton_ty) = cton_ty {
cton_ty
} else {
if sig.abi == Abi::C {
unimplemented!("Non scalars are not yet supported for \"C\" abi");
}
types::I64
}
}))
.map(AbiParam::new).collect(),
returns: vec![],
params,
returns,
call_conv,
argument_bytes: None,
}
@ -194,7 +248,19 @@ pub fn codegen_fn_prelude<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx>, start_ebb
_ => unimplemented!("declared function with non \"rust\" or \"rust-call\" abi"),
}
let ret_param = fx.bcx.append_ebb_param(start_ebb, types::I64);
let ret_layout = fx.layout_of(fx.return_type());
let output_pass_mode = get_pass_mode(fx.tcx, fx.self_sig().abi, fx.return_type(), true);
let ret_param = match output_pass_mode {
PassMode::NoPass => {
None
}
PassMode::ByVal(ret_ty) => {
None
}
PassMode::ByRef => {
Some(fx.bcx.append_ebb_param(start_ebb, types::I64))
}
};
enum ArgKind {
Normal(Value),
@ -218,20 +284,34 @@ pub fn codegen_fn_prelude<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx>, start_ebb
let mut ebb_params = Vec::new();
for arg_ty in tupled_arg_tys.iter() {
let cton_type = fx.cton_type(arg_ty).unwrap_or(types::I64);
let cton_type = get_pass_mode(fx.tcx, fx.self_sig().abi, arg_ty, false).get_param_ty(fx);
ebb_params.push(fx.bcx.append_ebb_param(start_ebb, cton_type));
}
(local, ArgKind::Spread(ebb_params), arg_ty)
} else {
let cton_type = fx.cton_type(arg_ty).unwrap_or(types::I64);
let cton_type = get_pass_mode(fx.tcx, fx.self_sig().abi, arg_ty, false).get_param_ty(fx);
(local, ArgKind::Normal(fx.bcx.append_ebb_param(start_ebb, cton_type)), arg_ty)
}
}).collect::<Vec<(Local, ArgKind, Ty)>>();
let ret_layout = fx.layout_of(fx.return_type());
match output_pass_mode {
PassMode::NoPass => {
let null = fx.bcx.ins().iconst(types::I64, 0);
//unimplemented!("pass mode nopass");
fx.local_map.insert(RETURN_PLACE, CPlace::Addr(null, fx.layout_of(fx.return_type())));
}
PassMode::ByVal(ret_ty) => {
let var = Variable(RETURN_PLACE);
fx.bcx.declare_var(var, ret_ty);
fx.local_map
.insert(RETURN_PLACE, CPlace::Addr(ret_param, ret_layout));
.insert(RETURN_PLACE, CPlace::Var(var, ret_layout));
}
PassMode::ByRef => {
fx.local_map
.insert(RETURN_PLACE, CPlace::Addr(ret_param.unwrap(), ret_layout));
}
}
for (local, arg_kind, ty) in func_params {
let layout = fx.layout_of(ty);
@ -244,7 +324,14 @@ pub fn codegen_fn_prelude<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx>, start_ebb
{
let var = Variable(local);
fx.bcx.declare_var(var, fx.cton_type(ty).unwrap());
fx.bcx.def_var(var, ebb_param);
match get_pass_mode(fx.tcx, fx.self_sig().abi, ty, false) {
PassMode::NoPass => unimplemented!("pass mode nopass"),
PassMode::ByVal(_) => fx.bcx.def_var(var, ebb_param),
PassMode::ByRef => {
let val = CValue::ByRef(ebb_param, fx.layout_of(ty)).load_value(fx);
fx.bcx.def_var(var, val);
}
}
fx.local_map.insert(local, CPlace::Var(var, layout));
continue;
}
@ -260,19 +347,19 @@ pub fn codegen_fn_prelude<'a, 'tcx: 'a>(fx: &mut FunctionCx<'a, 'tcx>, start_ebb
match arg_kind {
ArgKind::Normal(ebb_param) => {
if fx.cton_type(ty).is_some() {
place.write_cvalue(fx, CValue::ByVal(ebb_param, place.layout()));
} else {
place.write_cvalue(fx, CValue::ByRef(ebb_param, place.layout()));
match get_pass_mode(fx.tcx, fx.self_sig().abi, ty, false) {
PassMode::NoPass => unimplemented!("pass mode nopass"),
PassMode::ByVal(_) => place.write_cvalue(fx, CValue::ByVal(ebb_param, place.layout())),
PassMode::ByRef => place.write_cvalue(fx, CValue::ByRef(ebb_param, place.layout())),
}
}
ArgKind::Spread(ebb_params) => {
for (i, ebb_param) in ebb_params.into_iter().enumerate() {
let sub_place = place.place_field(fx, mir::Field::new(i));
if fx.cton_type(sub_place.layout().ty).is_some() {
sub_place.write_cvalue(fx, CValue::ByVal(ebb_param, sub_place.layout()));
} else {
sub_place.write_cvalue(fx, CValue::ByRef(ebb_param, sub_place.layout()));
match get_pass_mode(fx.tcx, fx.self_sig().abi, sub_place.layout().ty, false) {
PassMode::NoPass => unimplemented!("pass mode nopass"),
PassMode::ByVal(_) => sub_place.write_cvalue(fx, CValue::ByVal(ebb_param, sub_place.layout())),
PassMode::ByRef => sub_place.write_cvalue(fx, CValue::ByRef(ebb_param, sub_place.layout())),
}
}
}
@ -350,33 +437,48 @@ pub fn codegen_call<'a, 'tcx: 'a>(
return;
}
let return_ptr = match destination {
Some((place, _)) => place.expect_addr(),
None => fx.bcx.ins().iconst(types::I64, 0),
let ret_layout = fx.layout_of(sig.output());
let output_pass_mode = get_pass_mode(fx.tcx, sig.abi, sig.output(), true);
println!("{:?}", output_pass_mode);
let return_ptr = match output_pass_mode {
PassMode::NoPass => None,
PassMode::ByRef => match destination {
Some((place, _)) => Some(place.expect_addr()),
None => Some(fx.bcx.ins().iconst(types::I64, 0)),
},
PassMode::ByVal(_) => None,
};
let call_args = Some(return_ptr)
let call_args: Vec<Value> = return_ptr
.into_iter()
.chain(args.into_iter().map(|arg| {
if fx.cton_type(arg.layout().ty).is_some() {
arg.load_value(fx)
} else {
arg.force_stack(fx)
}
})).collect::<Vec<_>>();
.chain(
args.into_iter()
.map(|arg| match get_pass_mode(fx.tcx, sig.abi, arg.layout().ty, false) {
PassMode::NoPass => unimplemented!("pass mode nopass"),
PassMode::ByVal(_) => arg.load_value(fx),
PassMode::ByRef => arg.force_stack(fx),
}),
).collect::<Vec<_>>();
match func {
CValue::Func(func, _) => {
fx.bcx.ins().call(func, &call_args);
}
let inst = match func {
CValue::Func(func, _) => fx.bcx.ins().call(func, &call_args),
func => {
let func_ty = func.layout().ty;
let func = func.load_value(fx);
let sig = fx
.bcx
.import_signature(cton_sig_from_fn_ty(fx.tcx, func_ty));
fx.bcx.ins().call_indirect(sig, func, &call_args);
let sig = fx.bcx.import_signature(cton_sig_from_fn_ty(fx.tcx, fn_ty));
fx.bcx.ins().call_indirect(sig, func, &call_args)
}
};
match output_pass_mode {
PassMode::NoPass => {}
PassMode::ByVal(_) => {
if let Some((ret_place, _)) = destination {
let results = fx.bcx.inst_results(inst);
ret_place.write_cvalue(fx, CValue::ByVal(results[0], ret_layout));
}
}
PassMode::ByRef => {}
}
if let Some((_, dest)) = destination {
let ret_ebb = fx.get_ebb(dest);
@ -387,7 +489,16 @@ pub fn codegen_call<'a, 'tcx: 'a>(
}
pub fn codegen_return(fx: &mut FunctionCx) {
match get_pass_mode(fx.tcx, fx.self_sig().abi, fx.return_type(), true) {
PassMode::NoPass | PassMode::ByRef => {
fx.bcx.ins().return_(&[]);
},
PassMode::ByVal(_) => {
let place = fx.get_local_place(RETURN_PLACE);
let ret_val = place.to_cvalue(fx).load_value(fx);
fx.bcx.ins().return_(&[ret_val]);
}
}
}
fn codegen_intrinsic_call<'a, 'tcx: 'a>(