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artiq/symbol_resolver: Handle type of zero-length lists

This commit is contained in:
David Mak 2024-07-15 16:56:55 +08:00
parent 8f95c707d7
commit 2cdb057d20
2 changed files with 11 additions and 4 deletions
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9
nac3artiq/src/symbol_resolver.rs
View File

@ -991,8 +991,15 @@ impl InnerResolver {
}
_ => unreachable!("must be list"),
};
let ty = ctx.get_llvm_type(generator, elem_ty);
let size_t = generator.get_size_type(ctx.ctx);
let ty = if len == 0
&& matches!(&*ctx.unifier.get_ty_immutable(elem_ty), TypeEnum::TVar { .. })
{
// The default type for zero-length lists of unknown element type is size_t
size_t.into()
} else {
ctx.get_llvm_type(generator, elem_ty)
};
let arr_ty = ctx
.ctx
.struct_type(&[ty.ptr_type(AddressSpace::default()).into(), size_t.into()], false);

6
nac3core/src/codegen/expr.rs
View File

@ -951,9 +951,9 @@ pub fn destructure_range<'ctx>(
/// Allocates a List structure with the given [type][ty] and [length]. The name of the resulting
/// LLVM value is `{name}.addr`, or `list.addr` if [name] is not specified.
///
/// Setting `ty` to [`None`] implies that the list does not have a known element type, which is only
/// valid for empty lists. It is undefined behavior to generate a sized list with an unknown element
/// type.
/// Setting `ty` to [`None`] implies that the list is empty **and** does not have a known element
/// type, and will therefore set the `list.data` type as `size_t*`. It is undefined behavior to
/// generate a sized list with an unknown element type.
pub fn allocate_list<'ctx, G: CodeGenerator + ?Sized>(
generator: &mut G,
ctx: &mut CodeGenContext<'ctx, '_>,