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LibJS: Add support for await expressions

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Idan Horowitz 2021-11-09 22:52:21 +02:00 • committed by Linus Groh
parent 681787de76
commit 46dabf02ec
7 changed files with 169 additions and 4 deletions
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23
Userland/Libraries/LibJS/AST.cpp
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@ -28,6 +28,8 @@
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/ObjectEnvironment.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/PromiseConstructor.h>
#include <LibJS/Runtime/PromiseReaction.h>
#include <LibJS/Runtime/Reference.h>
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/Shape.h>
@ -393,6 +395,21 @@ Value YieldExpression::execute(Interpreter&, GlobalObject&) const
VERIFY_NOT_REACHED();
}
// 15.8.5 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-async-function-definitions-runtime-semantics-evaluation
Value AwaitExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
// 1. Let exprRef be the result of evaluating UnaryExpression.
// 2. Let value be ? GetValue(exprRef).
auto value = m_argument->execute(interpreter, global_object);
if (interpreter.exception())
return {};
// 3. Return ? Await(value).
return TRY_OR_DISCARD(await(global_object, value));
}
Value ReturnStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
@ -1973,6 +1990,12 @@ void YieldExpression::dump(int indent) const
argument()->dump(indent + 1);
}
void AwaitExpression::dump(int indent) const
{
ASTNode::dump(indent);
m_argument->dump(indent + 1);
}
void ReturnStatement::dump(int indent) const
{
ASTNode::dump(indent);