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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

13
compiler/mono/src/alias_analysis.rs
View file

@ -308,7 +308,7 @@ fn build_entry_point(
let block = builder.add_block();
let type_id = layout_spec(&mut builder, &Layout::Struct(layouts))?;
let type_id = layout_spec(&mut builder, &Layout::struct_no_name_order(layouts))?;
let argument = builder.add_unknown_with(block, &[], type_id)?;
@ -349,7 +349,10 @@ fn proc_spec<'a>(proc: &Proc<'a>) -> Result<(FuncDef, MutSet<UnionLayout<'a>>)>
let value_id = stmt_spec(&mut builder, &mut env, block, &proc.ret_layout, &proc.body)?;
let root = BlockExpr(block, value_id);
let arg_type_id = layout_spec(&mut builder, &Layout::Struct(&argument_layouts))?;
let arg_type_id = layout_spec(
&mut builder,
&Layout::struct_no_name_order(&argument_layouts),
)?;
let ret_type_id = layout_spec(&mut builder, &proc.ret_layout)?;
let spec = builder.build(arg_type_id, ret_type_id, root)?;
@ -1135,7 +1138,7 @@ fn call_spec(
// ListFindUnsafe returns { value: v, found: Bool=Int1 }
let output_layouts = vec![argument_layouts[0], Layout::Builtin(Builtin::Bool)];
let output_layout = Layout::Struct(&output_layouts);
let output_layout = Layout::struct_no_name_order(&output_layouts);
let output_type = layout_spec(builder, &output_layout)?;
let loop_body = |builder: &mut FuncDefBuilder, block, output| {
@ -1672,7 +1675,9 @@ fn layout_spec_help(
match layout {
Builtin(builtin) => builtin_spec(builder, builtin, when_recursive),
Struct(fields) => build_recursive_tuple_type(builder, fields, when_recursive),
Struct { field_layouts, .. } => {
build_recursive_tuple_type(builder, field_layouts, when_recursive)
}
LambdaSet(lambda_set) => layout_spec_help(
builder,
&lambda_set.runtime_representation(),