Stage 1 Draft / November 17, 2020

Standardized Debug

1 Left-Hand-Side Expressions

Syntax

CallExpression[Yield, Await]:CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await] SuperCall[?Yield, ?Await] ImportCall[?Yield, ?Await] DebuggerMetaCall[?Yield, ?Await] CallExpression[?Yield, ?Await]Arguments[?Yield, ?Await] CallExpression[?Yield, ?Await][Expression[+In, ?Yield, ?Await]] CallExpression[?Yield, ?Await].IdentifierName CallExpression[?Yield, ?Await]TemplateLiteral[?Yield, ?Await, +Tagged] DebuggerMetaCall[Yield, Await]:debugger.log(AssignmentExpression[+In, ?Yield, ?Await]) debugger.break(AssignmentExpression[+In, ?Yield, ?Await]opt)

1.1 Meta Properties

1.1.1 Runtime Semantics: Evaluation

DebuggerMetaCall:debugger.log(AssignmentExpression)
  1. Let exprRef be the result of evaluating AssignmentExpression.
  2. Let expr be ? GetValue(exprRef).
  3. If an implementation-defined debugging facility is available and enabled, then
    1. Perform an implementation-defined debugging action with expr. This must not return an abrupt completion.
  4. Return expr.
 DebuggerMetaCall:debugger.break(AssignmentExpressionopt)
  1. If AssignmentExpression is present, then
    1. Let exprRef be the result of evaluating AssignmentExpression.
    2. Let expr be ? GetValue(exprRef).
  2. Else,
    1. Let expr be empty.
    2. NOTE: empty is used to signify the difference between undefined being passed and no argument being present.
  3. If an implementation-defined debugging facility is available and enabled, then
    1. Perform an implementation-defined debugging action with expr. This must not return an abrupt completion.
  4. If expr is empty, then
    1. Return undefined.
  5. Return expr.

A Copyright & Software License

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