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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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28
Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
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@ -736,7 +736,7 @@ void async_block_start(VM& vm, NonnullRefPtr<Statement> const& async_body, Promi
auto& running_context = vm.running_execution_context();
// 3. Set the code evaluation state of asyncContext such that when evaluation is resumed for that execution context the following steps will be performed:
auto execution_steps = NativeFunction::create(realm, "", [&async_body, &promise_capability](auto& vm) -> ThrowCompletionOr<Value> {
auto execution_steps = NativeFunction::create(realm, "", [&async_body, &promise_capability, &async_context](auto& vm) -> ThrowCompletionOr<Value> {
// a. Let result be the result of evaluating asyncBody.
auto result = async_body->execute(vm.interpreter());
@ -745,17 +745,24 @@ void async_block_start(VM& vm, NonnullRefPtr<Statement> const& async_body, Promi
// c. Remove asyncContext from the execution context stack and restore the execution context that is at the top of the execution context stack as the running execution context.
vm.pop_execution_context();
// d. If result.[[Type]] is normal, then
// d. Let env be asyncContext's LexicalEnvironment.
auto* env = async_context.lexical_environment;
VERIFY(is<DeclarativeEnvironment>(env));
// e. Set result to DisposeResources(env, result).
result = dispose_resources(vm, static_cast<DeclarativeEnvironment*>(env), result);
// f. If result.[[Type]] is normal, then
if (result.type() == Completion::Type::Normal) {
// i. Perform ! Call(promiseCapability.[[Resolve]], undefined, « undefined »).
MUST(call(vm, *promise_capability.resolve(), js_undefined(), js_undefined()));
}
// e. Else if result.[[Type]] is return, then
// g. Else if result.[[Type]] is return, then
else if (result.type() == Completion::Type::Return) {
// i. Perform ! Call(promiseCapability.[[Resolve]], undefined, « result.[[Value]] »).
MUST(call(vm, *promise_capability.resolve(), js_undefined(), *result.value()));
}
// f. Else,
// h. Else,
else {
// i. Assert: result.[[Type]] is throw.
VERIFY(result.type() == Completion::Type::Throw);
@ -763,7 +770,7 @@ void async_block_start(VM& vm, NonnullRefPtr<Statement> const& async_body, Promi
// ii. Perform ! Call(promiseCapability.[[Reject]], undefined, « result.[[Value]] »).
MUST(call(vm, *promise_capability.reject(), js_undefined(), *result.value()));
}
// g. Return unused.
// i. Return unused.
// NOTE: We don't support returning an empty/optional/unused value here.
return js_undefined();
});
@ -882,8 +889,15 @@ Completion ECMAScriptFunctionObject::ordinary_call_evaluate_body()
// 1. Perform ? FunctionDeclarationInstantiation(functionObject, argumentsList).
TRY(function_declaration_instantiation(ast_interpreter));
// 2. Return the result of evaluating FunctionStatementList.
return m_ecmascript_code->execute(*ast_interpreter);
// 2. Let result be result of evaluating FunctionStatementList.
auto result = m_ecmascript_code->execute(*ast_interpreter);
// 3. Let env be the running execution context's LexicalEnvironment.
auto* env = vm.running_execution_context().lexical_environment;
VERIFY(is<DeclarativeEnvironment>(env));
// 4. Return ? DisposeResources(env, result).
return dispose_resources(vm, static_cast<DeclarativeEnvironment*>(env), result);
}
// AsyncFunctionBody : FunctionBody
else if (m_kind == FunctionKind::Async) {