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manually track visited varibles in deep_copy_var_to

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This commit is contained in:
Folkert 2021-11-20 01:39:57 +01:00
parent 2bccc2d28d
commit 594e754e1e
2 changed files with 53 additions and 23 deletions
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2
compiler/solve/src/solve.rs
View file

@ -1373,7 +1373,7 @@ fn instantiate_rigids_help(subs: &mut Subs, max_rank: Rank, initial: Variable) {
}
// we have tracked all visited variables, and can now traverse them
// in one go (without looking at the UnificationTable) and clear copy field
// in one go (without looking at the UnificationTable) and clear the copy field
for var in visited {
let descriptor = subs.get_ref_mut(var);

74
compiler/types/src/subs.rs
View file

@ -3042,15 +3042,28 @@ pub fn deep_copy_var_to(
// capacity based on the false hello world program
let arena = bumpalo::Bump::with_capacity(4 * 1024);
let copy = deep_copy_var_to_help(&arena, source, target, rank, var);
let mut visited = bumpalo::collections::Vec::with_capacity_in(256, &arena);
source.restore(var);
let copy = deep_copy_var_to_help(&arena, &mut visited, source, target, rank, var);
// we have tracked all visited variables, and can now traverse them
// in one go (without looking at the UnificationTable) and clear the copy field
for var in visited {
let descriptor = source.get_ref_mut(var);
if descriptor.copy.is_some() {
descriptor.rank = Rank::NONE;
descriptor.mark = Mark::NONE;
descriptor.copy = OptVariable::NONE;
}
}
copy
}
fn deep_copy_var_to_help<'a>(
arena: &'a bumpalo::Bump,
visited: &mut bumpalo::collections::Vec<'a, Variable>,
source: &mut Subs,
target: &mut Subs,
max_rank: Rank,
@ -3066,7 +3079,7 @@ fn deep_copy_var_to_help<'a>(
debug_assert!(target.contains(copy));
return copy;
} else if desc.rank != Rank::NONE {
// DO NOTHING
// DO NOTHING, Fall through
//
// The original deep_copy_var can do
// return var;
@ -3075,6 +3088,8 @@ fn deep_copy_var_to_help<'a>(
// should only return variables in the target
}
visited.push(var);
let make_descriptor = |content| Descriptor {
content,
rank: max_rank,
@ -3104,7 +3119,9 @@ fn deep_copy_var_to_help<'a>(
for index in args.into_iter() {
let var = source[index];
new_args.push(deep_copy_var_to_help(arena, source, target, max_rank, var));
new_args.push(deep_copy_var_to_help(
arena, visited, source, target, max_rank, var,
));
}
let arg_vars = VariableSubsSlice::insert_into_subs(target, new_args);
@ -3114,16 +3131,23 @@ fn deep_copy_var_to_help<'a>(
Func(arg_vars, closure_var, ret_var) => {
let new_ret_var =
deep_copy_var_to_help(arena, source, target, max_rank, ret_var);
deep_copy_var_to_help(arena, visited, source, target, max_rank, ret_var);
let new_closure_var =
deep_copy_var_to_help(arena, source, target, max_rank, closure_var);
let new_closure_var = deep_copy_var_to_help(
arena,
visited,
source,
target,
max_rank,
closure_var,
);
let mut new_arg_vars = Vec::with_capacity_in(arg_vars.len(), arena);
for index in arg_vars.into_iter() {
let var = source[index];
let copy_var = deep_copy_var_to_help(arena, source, target, max_rank, var);
let copy_var =
deep_copy_var_to_help(arena, visited, source, target, max_rank, var);
new_arg_vars.push(copy_var);
}
@ -3140,8 +3164,9 @@ fn deep_copy_var_to_help<'a>(
for index in fields.iter_variables() {
let var = source[index];
let copy_var =
deep_copy_var_to_help(arena, source, target, max_rank, var);
let copy_var = deep_copy_var_to_help(
arena, visited, source, target, max_rank, var,
);
new_vars.push(copy_var);
}
@ -3172,12 +3197,13 @@ fn deep_copy_var_to_help<'a>(
Record(
record_fields,
deep_copy_var_to_help(arena, source, target, max_rank, ext_var),
deep_copy_var_to_help(arena, visited, source, target, max_rank, ext_var),
)
}
TagUnion(tags, ext_var) => {
let new_ext = deep_copy_var_to_help(arena, source, target, max_rank, ext_var);
let new_ext =
deep_copy_var_to_help(arena, visited, source, target, max_rank, ext_var);
let mut new_variable_slices = Vec::with_capacity_in(tags.len(), arena);
@ -3186,8 +3212,9 @@ fn deep_copy_var_to_help<'a>(
let slice = source[index];
for var_index in slice {
let var = source[var_index];
let new_var =
deep_copy_var_to_help(arena, source, target, max_rank, var);
let new_var = deep_copy_var_to_help(
arena, visited, source, target, max_rank, var,
);
new_variables.push(new_var);
}
@ -3231,7 +3258,7 @@ fn deep_copy_var_to_help<'a>(
FunctionOrTagUnion(
new_tag_name,
symbol,
deep_copy_var_to_help(arena, source, target, max_rank, ext_var),
deep_copy_var_to_help(arena, visited, source, target, max_rank, ext_var),
)
}
@ -3243,8 +3270,9 @@ fn deep_copy_var_to_help<'a>(
let slice = source[index];
for var_index in slice {
let var = source[var_index];
let new_var =
deep_copy_var_to_help(arena, source, target, max_rank, var);
let new_var = deep_copy_var_to_help(
arena, visited, source, target, max_rank, var,
);
new_variables.push(new_var);
}
@ -3277,9 +3305,10 @@ fn deep_copy_var_to_help<'a>(
let union_tags = UnionTags::from_slices(new_tag_names, new_variables);
let new_ext = deep_copy_var_to_help(arena, source, target, max_rank, ext_var);
let new_ext =
deep_copy_var_to_help(arena, visited, source, target, max_rank, ext_var);
let new_rec_var =
deep_copy_var_to_help(arena, source, target, max_rank, rec_var);
deep_copy_var_to_help(arena, visited, source, target, max_rank, rec_var);
RecursiveTagUnion(new_rec_var, union_tags, new_ext)
}
@ -3296,7 +3325,8 @@ fn deep_copy_var_to_help<'a>(
opt_name,
structure,
} => {
let new_structure = deep_copy_var_to_help(arena, source, target, max_rank, structure);
let new_structure =
deep_copy_var_to_help(arena, visited, source, target, max_rank, structure);
debug_assert!((new_structure.index() as usize) < target.len());
@ -3322,7 +3352,7 @@ fn deep_copy_var_to_help<'a>(
for var_index in args.variables() {
let var = source[var_index];
let new_var = deep_copy_var_to_help(arena, source, target, max_rank, var);
let new_var = deep_copy_var_to_help(arena, visited, source, target, max_rank, var);
new_vars.push(new_var);
}
@ -3336,7 +3366,7 @@ fn deep_copy_var_to_help<'a>(
target.field_names.extend(lowercases.iter().cloned());
let new_real_type_var =
deep_copy_var_to_help(arena, source, target, max_rank, real_type_var);
deep_copy_var_to_help(arena, visited, source, target, max_rank, real_type_var);
let new_content = Alias(symbol, args, new_real_type_var);
target.set(copy, make_descriptor(new_content));