language-servers/roc
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allow returning of funtions

Browse source 
e.g.

foo = Num.add
This commit is contained in:
Folkert 2020-11-08 15:46:36 +01:00
parent b0c169bc5a
commit 1bce119b0a
3 changed files with 111 additions and 16 deletions
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101
compiler/mono/src/ir.rs
View file

@ -4678,6 +4678,12 @@ fn call_by_name<'a>(
.specialized
.contains_key(&(proc_name, full_layout.clone()))
{
debug_assert_eq!(
arg_layouts.len(),
field_symbols.len(),
"see call_by_name for background (scroll down a bit)"
);
let call = Expr::FunctionCall {
call_type: CallType::ByName(proc_name),
ret_layout: ret_layout.clone(),
@ -4721,6 +4727,11 @@ fn call_by_name<'a>(
);
}
debug_assert_eq!(
arg_layouts.len(),
field_symbols.len(),
"see call_by_name for background (scroll down a bit)"
);
let call = Expr::FunctionCall {
call_type: CallType::ByName(proc_name),
ret_layout: ret_layout.clone(),
@ -4762,13 +4773,78 @@ fn call_by_name<'a>(
let function_layout =
FunctionLayouts::from_layout(env.arena, layout);
procs.specialized.remove(&(proc_name, full_layout));
procs.specialized.remove(&(proc_name, full_layout.clone()));
procs.specialized.insert(
(proc_name, function_layout.full.clone()),
Done(proc),
);
if field_symbols.is_empty() {
debug_assert!(loc_args.is_empty());
// This happens when we return a function, e.g.
//
// foo = Num.add
//
// Even though the layout (and type) are functions,
// there are no arguments. This confuses our IR,
// and we have to fix it here.
match full_layout {
Layout::Closure(_, closure_layout, _) => {
let call = Expr::FunctionCall {
call_type: CallType::ByName(proc_name),
ret_layout: function_layout.result.clone(),
full_layout: function_layout.full.clone(),
arg_layouts: function_layout.arguments,
args: field_symbols,
};
// in the case of a closure specifically, we
// have to create a custom layout, to make sure
// the closure data is part of the layout
let closure_struct_layout = Layout::Struct(
env.arena.alloc([
function_layout.full,
closure_layout
.as_block_of_memory_layout(),
]),
);
let result = Stmt::Let(
assigned,
call,
closure_struct_layout,
hole,
);
result
}
_ => {
let call = Expr::FunctionCall {
call_type: CallType::ByName(proc_name),
ret_layout: function_layout.result.clone(),
full_layout: function_layout.full.clone(),
arg_layouts: function_layout.arguments,
args: field_symbols,
};
let result = Stmt::Let(
assigned,
call,
function_layout.full,
hole,
);
result
}
}
} else {
debug_assert_eq!(
function_layout.arguments.len(),
field_symbols.len(),
"scroll up a bit for background"
);
let call = Expr::FunctionCall {
call_type: CallType::ByName(proc_name),
ret_layout: function_layout.result.clone(),
@ -4782,10 +4858,21 @@ fn call_by_name<'a>(
.rev()
.zip(field_symbols.iter().rev());
let result =
Stmt::Let(assigned, call, function_layout.result, hole);
let result = Stmt::Let(
assigned,
call,
function_layout.result,
hole,
);
assign_to_symbols(env, procs, layout_cache, iter, result)
assign_to_symbols(
env,
procs,
layout_cache,
iter,
result,
)
}
}
Err(error) => {
let error_msg = env.arena.alloc(format!(
@ -4804,6 +4891,12 @@ fn call_by_name<'a>(
None if assigned.module_id() != proc_name.module_id() => {
add_needed_external(procs, env, original_fn_var, proc_name);
debug_assert_eq!(
arg_layouts.len(),
field_symbols.len(),
"scroll up a bit for background"
);
let call = Expr::FunctionCall {
call_type: CallType::ByName(proc_name),
ret_layout: ret_layout.clone(),

1
examples/effect/Main.roc
View file

@ -5,4 +5,3 @@ main =
Effect.putLine "Write a thing!"
|> Effect.after (\{} -> Effect.getLine {})
|> Effect.after (\line -> Effect.putLine line)

3
examples/effect/platform/Pkg-Config.roc
View file

@ -8,3 +8,6 @@ platform folkertdev/foo
putLine : Str -> Effect {},
getLine : {} -> Effect Str
}
mainForHost : Effect {} as Fx
mainForHost = main