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simplify capturing closure IR gen
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Folkert
parent
a15183a7d1
commit
bc71cf53d6
2 changed files with 96 additions and 113 deletions
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@ -4685,6 +4685,87 @@ fn sorted_field_symbols<'a>(
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field_symbols_temp
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}
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/// Insert a closure that may capture symbols to the list of partial procs
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fn register_capturing_closure<'a>(
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env: &mut Env<'a, '_>,
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procs: &mut Procs<'a>,
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layout_cache: &mut LayoutCache<'a>,
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closure_name: Symbol,
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closure_data: ClosureData,
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) {
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// the function surrounding the closure definition may be specialized multiple times,
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// hence in theory this partial proc may be added multiple times. That would be wasteful
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// so we check whether this partial proc is already there.
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//
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// (the `gen_primitives::task_always_twice` test has this behavior)
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if !procs.partial_procs.contains_key(closure_name) {
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let ClosureData {
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function_type,
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return_type,
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closure_type,
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closure_ext_var,
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recursive,
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arguments,
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loc_body: boxed_body,
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captured_symbols,
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..
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} = closure_data;
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let loc_body = *boxed_body;
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let is_self_recursive = !matches!(recursive, roc_can::expr::Recursive::NotRecursive);
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// does this function capture any local values?
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let function_layout = layout_cache.raw_from_var(env.arena, function_type, env.subs);
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let captured_symbols = match function_layout {
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Ok(RawFunctionLayout::Function(_, lambda_set, _)) => {
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if let Layout::Struct(&[]) = lambda_set.runtime_representation() {
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CapturedSymbols::None
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} else {
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let mut temp = Vec::from_iter_in(captured_symbols, env.arena);
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temp.sort();
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CapturedSymbols::Captured(temp.into_bump_slice())
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}
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}
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Ok(RawFunctionLayout::ZeroArgumentThunk(_)) => {
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// top-level thunks cannot capture any variables
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debug_assert!(
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captured_symbols.is_empty(),
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"{:?} with layout {:?} {:?} {:?}",
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&captured_symbols,
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function_layout,
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env.subs,
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(function_type, closure_type, closure_ext_var),
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);
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CapturedSymbols::None
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}
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Err(_) => {
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// just allow this. see https://github.com/rtfeldman/roc/issues/1585
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if captured_symbols.is_empty() {
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CapturedSymbols::None
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} else {
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let mut temp = Vec::from_iter_in(captured_symbols, env.arena);
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temp.sort();
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CapturedSymbols::Captured(temp.into_bump_slice())
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}
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}
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};
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let partial_proc = PartialProc::from_named_function(
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env,
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layout_cache,
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function_type,
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arguments,
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loc_body,
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captured_symbols,
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is_self_recursive,
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return_type,
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);
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procs.partial_procs.insert(closure_name, partial_proc);
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}
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}
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pub fn from_can<'a>(
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env: &mut Env<'a, '_>,
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variable: Variable,
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@ -4804,35 +4885,15 @@ pub fn from_can<'a>(
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// Now that we know for sure it's a closure, get an owned
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// version of these variant args so we can use them properly.
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match def.loc_expr.value {
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Closure(ClosureData {
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function_type,
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return_type,
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recursive,
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arguments,
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loc_body: boxed_body,
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..
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}) => {
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// Extract Procs, but discard the resulting Expr::Load.
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// That Load looks up the pointer, which we won't use here!
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let loc_body = *boxed_body;
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let is_self_recursive =
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!matches!(recursive, roc_can::expr::Recursive::NotRecursive);
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let partial_proc = PartialProc::from_named_function(
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Closure(closure_data) => {
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register_capturing_closure(
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env,
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procs,
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layout_cache,
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function_type,
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arguments,
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loc_body,
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CapturedSymbols::None,
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is_self_recursive,
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return_type,
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*symbol,
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closure_data,
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);
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procs.partial_procs.insert(*symbol, partial_proc);
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continue;
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}
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_ => unreachable!("recursive value is not a function"),
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@ -4845,90 +4906,12 @@ pub fn from_can<'a>(
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}
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LetNonRec(def, cont, outer_annotation) => {
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if let roc_can::pattern::Pattern::Identifier(symbol) = &def.loc_pattern.value {
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if let Closure(_) = &def.loc_expr.value {
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// Now that we know for sure it's a closure, get an owned
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// version of these variant args so we can use them properly.
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match def.loc_expr.value {
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Closure(ClosureData {
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function_type,
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return_type,
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closure_type,
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closure_ext_var,
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recursive,
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arguments,
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loc_body: boxed_body,
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captured_symbols,
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..
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}) => {
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if true || !procs.partial_procs.contains_key(*symbol) {
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let loc_body = *boxed_body;
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let is_self_recursive =
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!matches!(recursive, roc_can::expr::Recursive::NotRecursive);
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// does this function capture any local values?
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let function_layout =
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layout_cache.raw_from_var(env.arena, function_type, env.subs);
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let captured_symbols = match function_layout {
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Ok(RawFunctionLayout::Function(_, lambda_set, _)) => {
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if let Layout::Struct(&[]) =
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lambda_set.runtime_representation()
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{
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CapturedSymbols::None
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} else {
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let mut temp =
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Vec::from_iter_in(captured_symbols, env.arena);
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temp.sort();
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CapturedSymbols::Captured(temp.into_bump_slice())
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}
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}
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Ok(RawFunctionLayout::ZeroArgumentThunk(_)) => {
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// top-level thunks cannot capture any variables
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debug_assert!(
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captured_symbols.is_empty(),
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"{:?} with layout {:?} {:?} {:?}",
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&captured_symbols,
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function_layout,
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env.subs,
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(function_type, closure_type, closure_ext_var),
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);
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CapturedSymbols::None
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}
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Err(_) => {
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// just allow this. see https://github.com/rtfeldman/roc/issues/1585
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if captured_symbols.is_empty() {
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CapturedSymbols::None
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} else {
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let mut temp =
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Vec::from_iter_in(captured_symbols, env.arena);
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temp.sort();
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CapturedSymbols::Captured(temp.into_bump_slice())
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}
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}
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};
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let partial_proc = PartialProc::from_named_function(
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env,
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layout_cache,
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function_type,
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arguments,
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loc_body,
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captured_symbols,
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is_self_recursive,
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return_type,
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);
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procs.partial_procs.insert(*symbol, partial_proc);
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}
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return from_can(env, variable, cont.value, procs, layout_cache);
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}
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_ => unreachable!(),
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}
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}
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match def.loc_expr.value {
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roc_can::expr::Expr::Closure(closure_data) => {
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register_capturing_closure(env, procs, layout_cache, *symbol, closure_data);
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return from_can(env, variable, cont.value, procs, layout_cache);
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}
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roc_can::expr::Expr::Var(original) => {
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// a variable is aliased, e.g.
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//
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