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LibJS: Add using declaration support, RAII like operation in js

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In this patch only top level and not the more complicated for loop using
statements are supported. Also, as noted in the latest meeting of tc39
async parts of the spec are not stage 3 thus not included.
This commit is contained in:
davidot 2022-12-20 22:09:57 +01:00 • committed by Linus Groh
parent 2c87ff2218
commit 541637e15a
15 changed files with 861 additions and 68 deletions
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12
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.cpp
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@ -5,6 +5,7 @@
*/
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/FunctionObject.h>
@ -42,6 +43,11 @@ void DeclarativeEnvironment::visit_edges(Visitor& visitor)
Base::visit_edges(visitor);
for (auto& binding : m_bindings)
visitor.visit(binding.value);
for (auto& disposable : m_disposable_resource_stack) {
visitor.visit(disposable.resource_value);
visitor.visit(disposable.dispose_method);
}
}
// 9.1.1.1.1 HasBinding ( N ), https://tc39.es/ecma262/#sec-declarative-environment-records-hasbinding-n
@ -97,7 +103,7 @@ ThrowCompletionOr<void> DeclarativeEnvironment::create_immutable_binding(VM&, De
// 9.1.1.1.4 InitializeBinding ( N, V ), https://tc39.es/ecma262/#sec-declarative-environment-records-initializebinding-n-v
// 4.1.1.1.1 InitializeBinding ( N, V, hint ), https://tc39.es/proposal-explicit-resource-management/#sec-declarative-environment-records
ThrowCompletionOr<void> DeclarativeEnvironment::initialize_binding(VM&, DeprecatedFlyString const& name, Value value, Environment::InitializeBindingHint)
ThrowCompletionOr<void> DeclarativeEnvironment::initialize_binding(VM& vm, DeprecatedFlyString const& name, Value value, Environment::InitializeBindingHint hint)
{
auto binding_and_index = find_binding_and_index(name);
VERIFY(binding_and_index.has_value());
@ -106,7 +112,9 @@ ThrowCompletionOr<void> DeclarativeEnvironment::initialize_binding(VM&, Deprecat
// 1. Assert: envRec must have an uninitialized binding for N.
VERIFY(binding.initialized == false);
// FIXME: 2. If hint is not normal, perform ? AddDisposableResource(envRec, V, hint).
// 2. If hint is not normal, perform ? AddDisposableResource(envRec, V, hint).
if (hint != Environment::InitializeBindingHint::Normal)
TRY(add_disposable_resource(vm, m_disposable_resource_stack, value, hint));
// 3. Set the bound value for N in envRec to V.
binding.value = value;