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Support function pointer MIR lowering

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This commit is contained in:
hkalbasi 2023-03-11 21:43:53 +03:30
parent 1b85b43e6f
commit a063f000ff
14 changed files with 468 additions and 164 deletions
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46
crates/hir-ty/src/mir/lower.rs
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@ -298,7 +298,7 @@ impl MirLowerCtx<'_> {
);
Ok(Some(current))
}
ValueNs::StructId(_) => {
ValueNs::FunctionId(_) | ValueNs::StructId(_) => {
// It's probably a unit struct or a zero sized function, so no action is needed.
Ok(Some(current))
}
@ -445,36 +445,36 @@ impl MirLowerCtx<'_> {
})
},
Expr::Call { callee, args, .. } => {
if let Some((func_id, generic_args)) =
self.infer.method_resolution(expr_id) {
let ty = chalk_ir::TyKind::FnDef(
CallableDefId::FunctionId(func_id).to_chalk(self.db),
generic_args,
)
.intern(Interner);
let func = Operand::from_bytes(vec![], ty);
return self.lower_call_and_args(
func,
iter::once(*callee).chain(args.iter().copied()),
place,
current,
self.is_uninhabited(expr_id),
);
}
let callee_ty = self.expr_ty_after_adjustments(*callee);
match &callee_ty.data(Interner).kind {
chalk_ir::TyKind::FnDef(..) => {
let func = Operand::from_bytes(vec![], callee_ty.clone());
self.lower_call_and_args(func, args.iter().copied(), place, current, self.is_uninhabited(expr_id))
}
TyKind::Scalar(_)
| TyKind::Tuple(_, _)
| TyKind::Array(_, _)
| TyKind::Adt(_, _)
| TyKind::Str
| TyKind::Foreign(_)
| TyKind::Slice(_) => {
return Err(MirLowerError::TypeError("function call on data type"))
chalk_ir::TyKind::Function(_) => {
let Some((func, current)) = self.lower_expr_to_some_operand(*callee, current)? else {
return Ok(None);
};
self.lower_call_and_args(func, args.iter().copied(), place, current, self.is_uninhabited(expr_id))
}
TyKind::Error => return Err(MirLowerError::MissingFunctionDefinition),
TyKind::AssociatedType(_, _)
| TyKind::Raw(_, _)
| TyKind::Ref(_, _, _)
| TyKind::OpaqueType(_, _)
| TyKind::Never
| TyKind::Closure(_, _)
| TyKind::Generator(_, _)
| TyKind::GeneratorWitness(_, _)
| TyKind::Placeholder(_)
| TyKind::Dyn(_)
| TyKind::Alias(_)
| TyKind::Function(_)
| TyKind::BoundVar(_)
| TyKind::InferenceVar(_, _) => not_supported!("dynamic function call"),
_ => return Err(MirLowerError::TypeError("function call on bad type")),
}
}
Expr::MethodCall { receiver, args, .. } => {