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transform TypedDef to use fewer clones
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Folkert
parent
5e48577d29
commit
b421df2a28
1 changed files with 91 additions and 107 deletions
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@ -1024,21 +1024,23 @@ fn canonicalize_pending_def<'a>(
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InvalidAlias { .. } => {
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// invalid aliases and opaques (shadowed, incorrect patterns) get ignored
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}
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TypedBody(loc_pattern, loc_can_pattern, loc_ann, loc_expr) => {
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let ann =
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TypedBody(_loc_pattern, loc_can_pattern, loc_ann, loc_expr) => {
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let type_annotation =
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canonicalize_annotation(env, scope, &loc_ann.value, loc_ann.region, var_store);
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// Record all the annotation's references in output.references.lookups
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for symbol in ann.references.iter() {
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for symbol in type_annotation.references.iter() {
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output.references.lookups.insert(*symbol);
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output.references.referenced_type_defs.insert(*symbol);
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}
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for (symbol, alias) in ann.aliases.clone() {
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for (symbol, alias) in type_annotation.aliases.clone() {
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aliases.insert(symbol, alias);
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}
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output.introduced_variables.union(&ann.introduced_variables);
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output
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.introduced_variables
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.union(&type_annotation.introduced_variables);
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// bookkeeping for tail-call detection. If we're assigning to an
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// identifier (e.g. `f = \x -> ...`), then this symbol can be tail-called.
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@ -1071,130 +1073,112 @@ fn canonicalize_pending_def<'a>(
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// which also implies it's not a self tail call!
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//
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// Only defs of the form (foo = ...) can be closure declarations or self tail calls.
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if let (
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&Pattern::Identifier(ref defined_symbol),
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&Closure(ClosureData {
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if let Loc {
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region,
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value: Pattern::Identifier(symbol),
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} = loc_can_pattern
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{
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if let &Closure(ClosureData {
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function_type,
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closure_type,
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closure_ext_var,
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return_type,
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name: ref symbol,
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name: ref closure_name,
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ref arguments,
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loc_body: ref body,
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ref captured_symbols,
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..
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}),
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) = (&loc_can_pattern.value, &loc_can_expr.value)
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{
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// Since everywhere in the code it'll be referred to by its defined name,
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// remove its generated name from the closure map. (We'll re-insert it later.)
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let references = env.closures.remove(symbol).unwrap_or_else(|| {
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panic!(
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"Tried to remove symbol {:?} from procedures, but it was not found: {:?}",
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symbol, env.closures
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)
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});
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// Re-insert the closure into the map, under its defined name.
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// closures don't have a name, and therefore pick a fresh symbol. But in this
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// case, the closure has a proper name (e.g. `foo` in `foo = \x y -> ...`
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// and we want to reference it by that name.
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env.closures.insert(*defined_symbol, references);
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// The closure is self tail recursive iff it tail calls itself (by defined name).
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let is_recursive = match can_output.tail_call {
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Some(ref symbol) if symbol == defined_symbol => Recursive::TailRecursive,
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_ => Recursive::NotRecursive,
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};
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// Recursion doesn't count as referencing. (If it did, all recursive functions
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// would result in circular def errors!)
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refs_by_symbol
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.entry(*defined_symbol)
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.and_modify(|(_, refs)| {
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refs.lookups = refs.lookups.without(defined_symbol);
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}) = &loc_can_expr.value
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{
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// Since everywhere in the code it'll be referred to by its defined name,
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// remove its generated name from the closure map. (We'll re-insert it later.)
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let references = env.closures.remove(closure_name).unwrap_or_else(|| {
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panic!(
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"Tried to remove symbol {:?} from procedures, but it was not found: {:?}",
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closure_name, env.closures
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)
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});
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// renamed_closure_def = Some(&defined_symbol);
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loc_can_expr.value = Closure(ClosureData {
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function_type,
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closure_type,
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closure_ext_var,
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return_type,
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name: *defined_symbol,
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captured_symbols: captured_symbols.clone(),
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recursive: is_recursive,
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arguments: arguments.clone(),
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loc_body: body.clone(),
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});
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// Re-insert the closure into the map, under its defined name.
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// closures don't have a name, and therefore pick a fresh symbol. But in this
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// case, the closure has a proper name (e.g. `foo` in `foo = \x y -> ...`
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// and we want to reference it by that name.
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env.closures.insert(symbol, references);
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// Functions' references don't count in defs.
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// See 3d5a2560057d7f25813112dfa5309956c0f9e6a9 and its
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// parent commit for the bug this fixed!
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let refs = References::new();
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// The closure is self tail recursive iff it tail calls itself (by defined name).
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let is_recursive = match can_output.tail_call {
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Some(tail_symbol) if tail_symbol == symbol => Recursive::TailRecursive,
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_ => Recursive::NotRecursive,
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};
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refs_by_symbol.insert(*defined_symbol, (loc_can_pattern.region, refs));
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// Recursion doesn't count as referencing. (If it did, all recursive functions
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// would result in circular def errors!)
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refs_by_symbol.entry(symbol).and_modify(|(_, refs)| {
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refs.lookups = refs.lookups.without(&symbol);
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});
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// renamed_closure_def = Some(&symbol);
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loc_can_expr.value = Closure(ClosureData {
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function_type,
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closure_type,
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closure_ext_var,
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return_type,
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name: symbol,
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captured_symbols: captured_symbols.clone(),
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recursive: is_recursive,
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arguments: arguments.clone(),
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loc_body: body.clone(),
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});
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// Functions' references don't count in defs.
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// See 3d5a2560057d7f25813112dfa5309956c0f9e6a9 and its
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// parent commit for the bug this fixed!
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let refs = References::new();
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refs_by_symbol.insert(symbol, (loc_can_pattern.region, refs));
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} else {
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let refs = can_output.references;
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refs_by_symbol.insert(symbol, (region, refs));
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}
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let symbol = *defined_symbol;
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let def = single_typed_can_def(
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loc_can_pattern,
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loc_can_expr,
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expr_var,
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Loc::at(loc_ann.region, ann),
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Loc::at(loc_ann.region, type_annotation),
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vars_by_symbol.clone(),
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);
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can_defs_by_symbol.insert(symbol, def);
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} else {
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// Store the referenced locals in the refs_by_symbol map, so we can later figure out
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// which defined names reference each other.
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if let Loc {
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region,
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value: Pattern::Identifier(symbol),
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} = loc_can_pattern
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{
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let refs = can_output.references;
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refs_by_symbol.insert(symbol, (region, refs));
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let def = single_typed_can_def(
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loc_can_pattern,
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loc_can_expr,
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expr_var,
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Loc::at(loc_ann.region, ann),
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vars_by_symbol.clone(),
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);
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can_defs_by_symbol.insert(symbol, def);
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} else {
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for (_, (symbol, region)) in scope.idents() {
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if !vars_by_symbol.contains_key(symbol) {
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continue;
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}
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let refs = can_output.references.clone();
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refs_by_symbol.insert(*symbol, (*region, refs));
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can_defs_by_symbol.insert(
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*symbol,
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Def {
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expr_var,
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// TODO try to remove this .clone()!
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loc_pattern: loc_can_pattern.clone(),
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loc_expr: Loc {
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region: loc_can_expr.region,
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// TODO try to remove this .clone()!
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value: loc_can_expr.value.clone(),
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},
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pattern_vars: vars_by_symbol.clone(),
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annotation: Some(Annotation {
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signature: ann.typ.clone(),
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introduced_variables: ann.introduced_variables.clone(),
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aliases: ann.aliases.clone(),
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region: loc_ann.region,
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}),
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},
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);
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for (_, (symbol, region)) in scope.idents() {
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if !vars_by_symbol.contains_key(symbol) {
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continue;
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}
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let refs = can_output.references.clone();
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refs_by_symbol.insert(*symbol, (*region, refs));
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can_defs_by_symbol.insert(
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*symbol,
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Def {
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expr_var,
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// TODO try to remove this .clone()!
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loc_pattern: loc_can_pattern.clone(),
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loc_expr: Loc {
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region: loc_can_expr.region,
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// TODO try to remove this .clone()!
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value: loc_can_expr.value.clone(),
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},
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pattern_vars: vars_by_symbol.clone(),
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annotation: Some(Annotation {
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signature: type_annotation.typ.clone(),
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introduced_variables: type_annotation.introduced_variables.clone(),
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aliases: type_annotation.aliases.clone(),
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region: loc_ann.region,
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}),
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},
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);
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}
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}
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}
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