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Hash record field name order in generated layouts

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Closes #2535

See the referenced issue for longer discussion - here's the synopsis.
Consider this program

```
app "test" provides [ nums ] to "./platform"

alpha = { a: 1, b: 2 }

nums : List U8
nums =
    [
        alpha.a,
        alpha.b,
    ]
```

Here's its IR:

```
procedure : `#UserApp.alpha` {I64, U8}
procedure = `#UserApp.alpha` ():
    let `#UserApp.5` : Builtin(Int(I64)) = 1i64;
    let `#UserApp.6` : Builtin(Int(U8)) = 2i64;
    let `#UserApp.4` : Struct([Builtin(Int(I64)), Builtin(Int(U8))]) = Struct {`#UserApp.5`, `#UserApp.6`};
    ret `#UserApp.4`;

procedure : `#UserApp.nums` List U8
procedure = `#UserApp.nums` ():
    let `#UserApp.7` : Struct([Builtin(Int(I64)), Builtin(Int(U8))]) = CallByName `#UserApp.alpha`;
    let `#UserApp.1` : Builtin(Int(U8)) = StructAtIndex 1 `#UserApp.7`;
    let `#UserApp.3` : Struct([Builtin(Int(I64)), Builtin(Int(U8))]) = CallByName `#UserApp.alpha`;
    let `#UserApp.2` : Builtin(Int(U8)) = StructAtIndex 1 `#UserApp.3`;
    let `#UserApp.0` : Builtin(List(Builtin(Int(U8)))) = Array [`#UserApp.1`, `#UserApp.2`];
    ret `#UserApp.0`;
```

What's happening is that we need to specialize `alpha` twice - once for the
type of a narrowed to a U8, another time for the type of b narrowed to a U8.

We do the specialization for alpha.b first - record fields are sorted by
layout, so we generate a record of type {i64, u8}. But then we go to
specialize alpha.a, but this has the same layout - {i64, u8} - so we reuse
the existing one! So (at least for records), we need to include record field
order associated with the sorted layout fields, so that we don't reuse
monomorphizations like this incorrectly!
This commit is contained in:
ayazhafiz 2022-02-20 19:51:21 -05:00
parent 74daec84df
commit e52d427ac8
22 changed files with 225 additions and 105 deletions
Download patch file Download diff file Expand all files Collapse all files

8
compiler/mono/src/code_gen_help/refcount.rs
View file

@ -12,7 +12,7 @@ use crate::layout::{Builtin, Layout, TagIdIntType, UnionLayout};
use super::{CodeGenHelp, Context, HelperOp};
const LAYOUT_BOOL: Layout = Layout::Builtin(Builtin::Bool);
const LAYOUT_UNIT: Layout = Layout::Struct(&[]);
const LAYOUT_UNIT: Layout = Layout::UNIT;
const LAYOUT_PTR: Layout = Layout::RecursivePointer;
const LAYOUT_U32: Layout = Layout::Builtin(Builtin::Int(IntWidth::U32));
@ -69,7 +69,7 @@ pub fn refcount_stmt<'a>(
}
// Struct and non-recursive Unions are stack-only, so DecRef is a no-op
Layout::Struct(_) => following,
Layout::Struct { .. } => following,
Layout::Union(UnionLayout::NonRecursive(_)) => following,
// Inline the refcounting code instead of making a function. Don't iterate fields,
@ -111,7 +111,7 @@ pub fn refcount_generic<'a>(
refcount_list(root, ident_ids, ctx, &layout, elem_layout, structure)
}
Layout::Builtin(Builtin::Dict(_, _) | Builtin::Set(_)) => rc_todo(),
Layout::Struct(field_layouts) => {
Layout::Struct { field_layouts, .. } => {
refcount_struct(root, ident_ids, ctx, field_layouts, structure)
}
Layout::Union(union_layout) => {
@ -135,7 +135,7 @@ pub fn is_rc_implemented_yet(layout: &Layout) -> bool {
Layout::Builtin(Builtin::Dict(..) | Builtin::Set(_)) => false,
Layout::Builtin(Builtin::List(elem_layout)) => is_rc_implemented_yet(elem_layout),
Layout::Builtin(_) => true,
Layout::Struct(fields) => fields.iter().all(is_rc_implemented_yet),
Layout::Struct { field_layouts, .. } => field_layouts.iter().all(is_rc_implemented_yet),
Layout::Union(union_layout) => match union_layout {
NonRecursive(tags) => tags
.iter()