mirror of
https://github.com/LadybirdBrowser/ladybird.git
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LibWeb: Add a very basic and ad-hoc version of IDL overload resolution
This initial version lays down the basic foundation of IDL overload resolution, but much of it will have to be replaced with the actual IDL overload resolution algorithms once we start implementing more complex IDL overloading scenarios.
This commit is contained in:
Idan Horowitz
Andreas Kling
parent
24cf56896b
commit
59e9e7cc61
Notes:
sideshowbarker
2024-07-17 17:53:59 +09:00
Author: https://github.com/IdanHo Commit: https://github.com/SerenityOS/serenity/commit/59e9e7cc61 Pull-request: https://github.com/SerenityOS/serenity/pull/12891
4 changed files with 198 additions and 28 deletions
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@ -10,6 +10,7 @@
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#include "IDLTypes.h"
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#include <AK/LexicalPath.h>
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#include <AK/Queue.h>
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#include <AK/QuickSort.h>
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Vector<StringView> s_header_search_paths;
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@ -1079,21 +1080,21 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
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}
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}
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template<typename FunctionType>
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static void generate_argument_count_check(SourceGenerator& generator, FunctionType& function)
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static void generate_argument_count_check(SourceGenerator& generator, String const& function_name, size_t argument_count)
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{
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auto argument_count_check_generator = generator.fork();
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argument_count_check_generator.set("function.name", function.name);
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argument_count_check_generator.set("function.nargs", String::number(function.length()));
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if (function.length() == 0)
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if (argument_count == 0)
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return;
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if (function.length() == 1) {
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auto argument_count_check_generator = generator.fork();
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argument_count_check_generator.set("function.name", function_name);
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argument_count_check_generator.set("function.nargs", String::number(argument_count));
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if (argument_count == 1) {
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argument_count_check_generator.set(".bad_arg_count", "JS::ErrorType::BadArgCountOne");
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argument_count_check_generator.set(".arg_count_suffix", "");
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} else {
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argument_count_check_generator.set(".bad_arg_count", "JS::ErrorType::BadArgCountMany");
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argument_count_check_generator.set(".arg_count_suffix", String::formatted(", \"{}\"", function.length()));
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argument_count_check_generator.set(".arg_count_suffix", String::formatted(", \"{}\"", argument_count));
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}
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argument_count_check_generator.append(R"~~~(
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@ -1316,6 +1317,7 @@ static void generate_function(SourceGenerator& generator, IDL::Function const& f
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function_generator.set("interface_fully_qualified_name", interface_fully_qualified_name);
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function_generator.set("function.name", function.name);
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(function.name.to_snakecase()));
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function_generator.set("overload_suffix", function.is_overloaded ? String::number(function.overload_index) : String::empty());
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if (function.extended_attributes.contains("ImplementedAs")) {
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auto implemented_as = function.extended_attributes.get("ImplementedAs").value();
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@ -1325,7 +1327,7 @@ static void generate_function(SourceGenerator& generator, IDL::Function const& f
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}
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function_generator.append(R"~~~(
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JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@)
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JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@@overload_suffix@)
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{
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)~~~");
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@ -1335,7 +1337,9 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@)
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)~~~");
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}
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generate_argument_count_check(generator, function);
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// Optimization: overloaded functions' arguments count is checked by the overload arbiter
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if (!function.is_overloaded)
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generate_argument_count_check(generator, function.name, function.length());
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StringBuilder arguments_builder;
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generate_arguments(generator, function.parameters, arguments_builder, interface);
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@ -1358,6 +1362,108 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@)
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)~~~");
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}
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// FIXME: This is extremely ad-hoc, implement the WebIDL overload resolution algorithm instead
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static Optional<String> generate_arguments_match_check_for_count(Vector<IDL::Parameter> const& parameters, size_t argument_count)
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{
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Vector<String> conditions;
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for (auto i = 0u; i < argument_count; ++i) {
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auto const& parameter = parameters[i];
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if (parameter.type->is_string() || parameter.type->is_numeric())
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continue;
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auto argument = String::formatted("arg{}", i);
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StringBuilder condition;
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condition.append('(');
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if (parameter.type->nullable)
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condition.appendff("{}.is_nullish() || ", argument);
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else if (parameter.optional)
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condition.appendff("{}.is_undefined() || ", argument);
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condition.appendff("{}.is_object()", argument);
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condition.append(')');
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conditions.append(condition.build());
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}
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if (conditions.is_empty())
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return {};
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return String::formatted("({})", String::join(" && ", conditions));
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}
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static String generate_arguments_match_check(Function const& function)
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{
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Vector<String> options;
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for (size_t i = 0; i < function.parameters.size(); ++i) {
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if (!function.parameters[i].optional && !function.parameters[i].variadic)
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continue;
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auto match_check = generate_arguments_match_check_for_count(function.parameters, i);
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if (match_check.has_value())
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options.append(match_check.release_value());
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}
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if (!function.parameters.is_empty() && !function.parameters.last().variadic) {
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auto match_check = generate_arguments_match_check_for_count(function.parameters, function.parameters.size());
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if (match_check.has_value())
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options.append(match_check.release_value());
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}
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return String::join(" || ", options);
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}
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static void generate_overload_arbiter(SourceGenerator& generator, auto const& overload_set, String const& class_name)
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{
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auto function_generator = generator.fork();
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function_generator.set("class_name", class_name);
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(overload_set.key.to_snakecase()));
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function_generator.append(R"~~~(
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JS_DEFINE_NATIVE_FUNCTION(@class_name@::@function.name:snakecase@)
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{
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)~~~");
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auto minimum_argument_count = get_shortest_function_length(overload_set.value);
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generate_argument_count_check(function_generator, overload_set.key, minimum_argument_count);
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auto overloaded_functions = overload_set.value;
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quick_sort(overloaded_functions, [](auto const& a, auto const& b) { return a.length() < b.length(); });
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auto fetched_arguments = 0u;
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for (auto i = 0u; i < overloaded_functions.size(); ++i) {
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auto const& overloaded_function = overloaded_functions[i];
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auto argument_count = overloaded_function.length();
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function_generator.set("argument_count", String::number(argument_count));
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function_generator.set("arguments_match_check", generate_arguments_match_check(overloaded_function));
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function_generator.set("overload_suffix", String::number(i));
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if (argument_count > fetched_arguments) {
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for (auto j = fetched_arguments; j < argument_count; ++j) {
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function_generator.set("argument.index", String::number(j));
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function_generator.append(R"~~~(
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[[maybe_unused]] auto arg@argument.index@ = vm.argument(@argument.index@);
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)~~~");
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}
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fetched_arguments = argument_count;
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}
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auto is_last = i == overloaded_functions.size() - 1;
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if (!is_last) {
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function_generator.append(R"~~~(
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if (vm.argument_count() == @argument_count@) {
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)~~~");
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}
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function_generator.append(R"~~~(
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if (@arguments_match_check@)
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return @function.name:snakecase@@overload_suffix@(vm, global_object);
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)~~~");
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if (!is_last) {
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function_generator.append(R"~~~(
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}
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)~~~");
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}
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}
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function_generator.append(R"~~~(
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return vm.throw_completion<JS::TypeError>(global_object, JS::ErrorType::OverloadResolutionFailed);
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}
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)~~~");
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}
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void generate_header(IDL::Interface const& interface)
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{
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StringBuilder builder;
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@ -2355,12 +2461,20 @@ private:
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virtual bool has_constructor() const override { return true; }
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)~~~");
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for (auto& function : interface.static_functions) {
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for (auto const& overload_set : interface.static_overload_sets) {
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auto function_generator = generator.fork();
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(function.name.to_snakecase()));
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(overload_set.key.to_snakecase()));
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function_generator.append(R"~~~(
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JS_DECLARE_NATIVE_FUNCTION(@function.name:snakecase@);
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)~~~");
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if (overload_set.value.size() > 1) {
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for (auto i = 0u; i < overload_set.value.size(); ++i) {
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function_generator.set("overload_suffix", String::number(i));
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function_generator.append(R"~~~(
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JS_DECLARE_NATIVE_FUNCTION(@function.name:snakecase@@overload_suffix@);
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)~~~");
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}
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}
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}
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generator.append(R"~~~(
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@ -2486,7 +2600,7 @@ JS::ThrowCompletionOr<JS::Object*> @constructor_class@::construct(FunctionObject
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)~~~");
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if (!constructor.parameters.is_empty()) {
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generate_argument_count_check(generator, constructor);
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generate_argument_count_check(generator, constructor.name, constructor.length());
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StringBuilder arguments_builder;
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generate_arguments(generator, constructor.parameters, arguments_builder, interface);
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@ -2534,11 +2648,11 @@ define_direct_property("@constant.name@", JS::Value((i32)@constant.value@), JS::
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}
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// https://webidl.spec.whatwg.org/#es-operations
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for (auto& function : interface.static_functions) {
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for (auto const& overload_set : interface.static_overload_sets) {
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auto function_generator = generator.fork();
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function_generator.set("function.name", function.name);
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(function.name.to_snakecase()));
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function_generator.set("function.length", String::number(function.length()));
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function_generator.set("function.name", overload_set.key);
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(overload_set.key.to_snakecase()));
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function_generator.set("function.length", String::number(get_shortest_function_length(overload_set.value)));
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function_generator.append(R"~~~(
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define_native_function("@function.name@", @function.name:snakecase@, @function.length@, default_attributes);
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@ -2550,8 +2664,12 @@ define_direct_property("@constant.name@", JS::Value((i32)@constant.value@), JS::
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)~~~");
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// Implementation: Static Functions
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for (auto& function : interface.static_functions) {
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for (auto& function : interface.static_functions)
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generate_function(generator, function, StaticFunction::Yes, interface.constructor_class, interface.fully_qualified_name, interface);
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for (auto const& overload_set : interface.static_overload_sets) {
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if (overload_set.value.size() == 1)
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continue;
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generate_overload_arbiter(generator, overload_set, interface.constructor_class);
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}
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generator.append(R"~~~(
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@ -2587,12 +2705,20 @@ public:
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private:
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)~~~");
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for (auto& function : interface.functions) {
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for (auto const& overload_set : interface.overload_sets) {
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auto function_generator = generator.fork();
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(function.name.to_snakecase()));
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(overload_set.key.to_snakecase()));
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function_generator.append(R"~~~(
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JS_DECLARE_NATIVE_FUNCTION(@function.name:snakecase@);
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)~~~");
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if (overload_set.value.size() > 1) {
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for (auto i = 0u; i < overload_set.value.size(); ++i) {
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function_generator.set("overload_suffix", String::number(i));
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function_generator.append(R"~~~(
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JS_DECLARE_NATIVE_FUNCTION(@function.name:snakecase@@overload_suffix@);
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)~~~");
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}
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}
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}
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if (interface.has_stringifier) {
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@ -2788,13 +2914,14 @@ void @prototype_class@::initialize(JS::GlobalObject& global_object)
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}
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// https://webidl.spec.whatwg.org/#es-operations
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for (auto& function : interface.functions) {
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for (auto const& overload_set : interface.overload_sets) {
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auto function_generator = generator.fork();
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function_generator.set("function.name", function.name);
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(function.name.to_snakecase()));
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function_generator.set("function.length", String::number(function.length()));
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function_generator.set("function.name", overload_set.key);
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function_generator.set("function.name:snakecase", make_input_acceptable_cpp(overload_set.key.to_snakecase()));
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function_generator.set("function.length", String::number(get_shortest_function_length(overload_set.value)));
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if (function.extended_attributes.contains("Unscopable")) {
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// FIXME: What if only some of the overloads are Unscopable?
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if (any_of(overload_set.value, [](auto const& function) { return function.extended_attributes.contains("Unscopable"); })) {
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function_generator.append(R"~~~(
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MUST(unscopable_object->create_data_property("@function.name@", JS::Value(true)));
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)~~~");
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@ -2971,8 +3098,12 @@ JS_DEFINE_NATIVE_FUNCTION(@prototype_class@::@attribute.setter_callback@)
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}
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// Implementation: Functions
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for (auto& function : interface.functions) {
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for (auto& function : interface.functions)
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generate_function(generator, function, StaticFunction::No, interface.prototype_class, interface.fully_qualified_name, interface);
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for (auto const& overload_set : interface.overload_sets) {
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if (overload_set.value.size() == 1)
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continue;
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generate_overload_arbiter(generator, overload_set, interface.prototype_class);
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}
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if (interface.has_stringifier) {
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@ -311,7 +311,7 @@ Function Parser::parse_function(HashMap<String, String>& extended_attributes, In
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consume_whitespace();
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assert_specific(';');
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Function function { move(return_type), name, move(parameters), move(extended_attributes) };
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Function function { move(return_type), name, move(parameters), move(extended_attributes), {}, false };
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// "Defining a special operation with an identifier is equivalent to separating the special operation out into its own declaration without an identifier."
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if (is_special_operation == IsSpecialOperation::No || (is_special_operation == IsSpecialOperation::Yes && !name.is_empty())) {
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@ -803,6 +803,31 @@ NonnullOwnPtr<Interface> Parser::parse()
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}
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}
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// Create overload sets
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for (auto& function : interface->functions) {
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auto& overload_set = interface->overload_sets.ensure(function.name);
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function.overload_index = overload_set.size();
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overload_set.append(function);
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}
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for (auto& overload_set : interface->overload_sets) {
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if (overload_set.value.size() == 1)
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continue;
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for (auto& overloaded_function : overload_set.value)
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overloaded_function.is_overloaded = true;
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}
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for (auto& function : interface->static_functions) {
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auto& overload_set = interface->static_overload_sets.ensure(function.name);
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function.overload_index = overload_set.size();
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overload_set.append(function);
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}
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for (auto& overload_set : interface->static_overload_sets) {
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if (overload_set.value.size() == 1)
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continue;
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for (auto& overloaded_function : overload_set.value)
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overloaded_function.is_overloaded = true;
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}
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// FIXME: Add support for overloading constructors
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interface->imported_modules = move(imports);
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return interface;
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@ -78,6 +78,8 @@ struct Function {
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String name;
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Vector<Parameter> parameters;
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HashMap<String, String> extended_attributes;
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size_t overload_index { 0 };
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bool is_overloaded { false };
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size_t length() const { return get_function_length(*this); }
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};
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@ -144,6 +146,14 @@ struct ParameterizedType : public Type {
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void generate_sequence_from_iterable(SourceGenerator& generator, String const& cpp_name, String const& iterable_cpp_name, String const& iterator_method_cpp_name, IDL::Interface const&, size_t recursion_depth) const;
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};
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static inline size_t get_shortest_function_length(Vector<Function&> const& overload_set)
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{
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size_t longest_length = SIZE_MAX;
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for (auto const& function : overload_set)
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longest_length = min(function.length(), longest_length);
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return longest_length;
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}
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struct Interface {
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String name;
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String parent_name;
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@ -189,6 +199,9 @@ struct Interface {
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HashTable<String> imported_paths;
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NonnullOwnPtrVector<Interface> imported_modules;
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HashMap<String, Vector<Function&>> overload_sets;
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HashMap<String, Vector<Function&>> static_overload_sets;
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// https://webidl.spec.whatwg.org/#dfn-support-indexed-properties
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bool supports_indexed_properties() const { return indexed_property_getter.has_value(); }
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@ -102,6 +102,7 @@
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"Object prototype must not be {} on a super property access") \
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M(ObjectPrototypeWrongType, "Prototype must be an object or null") \
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M(OptionIsNotValidValue, "{} is not a valid value for option {}") \
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M(OverloadResolutionFailed, "Overload resolution failed") \
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M(PrivateFieldAlreadyDeclared, "Private field '{}' has already been declared") \
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M(PrivateFieldDoesNotExistOnObject, "Private field '{}' does not exist on object") \
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M(PrivateFieldGetAccessorWithoutGetter, "Cannot get private field '{}' as accessor without getter") \
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