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LibIDL+LibWeb: Resolve distinguishing argument index at build time

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Aside from the obvious performance benefits, this will allow us to
properly handle dictionary types. (whose dictionary-ness is only known
at build-time)

Much of the rest of the overload resolution algorithm steps can (and
should) be evaluated at build-time as well, but this is a good first
step.
This commit is contained in:
Idan Horowitz 2023-11-10 23:38:59 +02:00 • committed by Andreas Kling
parent 048e179572
commit f837f02eea
4 changed files with 44 additions and 43 deletions
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53
Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
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@ -1925,7 +1925,7 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@@overload_suffi
}
// https://webidl.spec.whatwg.org/#compute-the-effective-overload-set
static EffectiveOverloadSet compute_the_effective_overload_set(auto const& overload_set)
static Vector<EffectiveOverloadSet::Item> compute_the_effective_overload_set(auto const& overload_set)
{
// 1. Let S be an ordered set.
Vector<EffectiveOverloadSet::Item> overloads;
@ -2048,7 +2048,7 @@ static EffectiveOverloadSet compute_the_effective_overload_set(auto const& overl
overload_id++;
}
return EffectiveOverloadSet { move(overloads) };
return overloads;
}
static DeprecatedString generate_constructor_for_idl_type(Type const& type)
@ -2090,6 +2090,30 @@ static DeprecatedString generate_constructor_for_idl_type(Type const& type)
VERIFY_NOT_REACHED();
}
// https://webidl.spec.whatwg.org/#dfn-distinguishing-argument-index
static size_t resolve_distinguishing_argument_index(Vector<EffectiveOverloadSet::Item> const& items, size_t argument_count)
{
for (auto argument_index = 0u; argument_index < argument_count; ++argument_index) {
bool found_indistinguishable = false;
for (auto first_item_index = 0u; first_item_index < items.size(); ++first_item_index) {
for (auto second_item_index = first_item_index + 1; second_item_index < items.size(); ++second_item_index) {
if (!items[first_item_index].types[argument_index]->is_distinguishable_from(items[second_item_index].types[argument_index])) {
found_indistinguishable = true;
break;
}
}
if (found_indistinguishable)
break;
}
if (!found_indistinguishable)
return argument_index;
}
VERIFY_NOT_REACHED();
}
static void generate_overload_arbiter(SourceGenerator& generator, auto const& overload_set, DeprecatedString const& class_name)
{
auto function_generator = generator.fork();
@ -2102,8 +2126,7 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@)
Optional<IDL::EffectiveOverloadSet> effective_overload_set;
)~~~");
auto all_possible_effective_overloads = compute_the_effective_overload_set(overload_set);
auto overloads_set = all_possible_effective_overloads.items();
auto overloads_set = compute_the_effective_overload_set(overload_set);
auto maximum_argument_count = 0u;
for (auto const& overload : overloads_set)
maximum_argument_count = max(maximum_argument_count, overload.types.size());
@ -2115,29 +2138,28 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@)
// Namely, since that discards any overloads that don't have the exact number of arguments that were given,
// we simply only provide the overloads that do have that number of arguments.
for (auto argument_count = 0u; argument_count <= maximum_argument_count; ++argument_count) {
// FIXME: Calculate the distinguishing argument index now instead of at runtime.
auto effective_overload_count = 0;
Vector<EffectiveOverloadSet::Item> effective_overload_set;
for (auto const& overload : overloads_set) {
if (overload.types.size() == argument_count)
effective_overload_count++;
effective_overload_set.append(overload);
}
if (effective_overload_count == 0)
if (effective_overload_set.size() == 0)
continue;
auto distinguishing_argument_index = 0u;
if (effective_overload_set.size() > 1)
distinguishing_argument_index = resolve_distinguishing_argument_index(effective_overload_set, argument_count);
function_generator.set("current_argument_count", DeprecatedString::number(argument_count));
function_generator.set("overload_count", DeprecatedString::number(effective_overload_count));
function_generator.set("overload_count", DeprecatedString::number(effective_overload_set.size()));
function_generator.appendln(R"~~~(
case @current_argument_count@: {
Vector<IDL::EffectiveOverloadSet::Item> overloads;
overloads.ensure_capacity(@overload_count@);
)~~~");
for (auto& overload : overloads_set) {
if (overload.types.size() != argument_count)
continue;
for (auto& overload : effective_overload_set) {
StringBuilder types_builder;
types_builder.append("Vector<NonnullRefPtr<IDL::Type const>> { "sv);
StringBuilder optionality_builder;
@ -2175,8 +2197,9 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@)
function_generator.appendln(" overloads.empend(@overload.callable_id@, @overload.types@, @overload.optionality_values@);");
}
function_generator.set("overload_set.distinguishing_argument_index", DeprecatedString::number(distinguishing_argument_index));
function_generator.append(R"~~~(
effective_overload_set.emplace(move(overloads));
effective_overload_set.emplace(move(overloads), @overload_set.distinguishing_argument_index@);
break;
}
)~~~");