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Keep track of the context in which an exception was thrown #95

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Keep track of the context in which an exception was thrown #95

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90 changes: 81 additions & 9 deletions spec.html
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,17 @@ <h1>Agents</h1>
<ins>A map from the AsyncContext.Variable instances to the saved ECMAScript language value. Every Record in the List contains a unique [[AsyncContextKey]]. The map is initially empty.</ins>
</td>
</tr>
<tr>
<td>
<ins>[[ThrowAsyncContextMapping]]</ins>
</td>
<td>
<ins>~unused~ or a List of Async Context Mapping Records</ins>
</td>
<td>
<ins>The value of [[AsyncContextMapping]] at the time of the last time an exception was thrown, if any. Used by hosts to provide Async Context Mapping information when reporting uncaught exceptions.</ins>
</td>
</tr>
</table>
</emu-table>
</emu-clause>
Expand All @@ -148,7 +159,7 @@ <h1>
1. <del>Perform ? HostCallJobCallback(_callback_, *undefined*, « _cell_.[[HeldValue]] »).</del>
1. <ins>Let _previousContextMapping_ be AsyncContextSwap(_finalizationRegistry_.[[FinalizationRegistryAsyncContextSnapshot]]).</ins>
1. <ins>Let _result_ be Completion(HostCallJobCallback(_callback_, *undefined*, « _cell_.[[HeldValue]] »)).</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_).</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_, _result_).</ins>
1. <ins>Perform ? _result_.</ins>
1. Return ~unused~.
</emu-alg>
Expand Down Expand Up @@ -203,6 +214,62 @@ <h1>
</emu-clause>
</emu-clause>

<emu-clause id="sec-ecmascript-language-statements-and-declarations">
<h1>ECMAScript Language: Statements and Declarations</h1>

<emu-clause id="sec-try-statement">
<h1>The `try` Statement</h1>

<emu-clause id="sec-try-statement-runtime-semantics-evaluation" type="sdo">
<h1>Runtime Semantics: Evaluation</h1>
<emu-grammar>TryStatement : `try` Block Catch</emu-grammar>
<emu-alg>
1. Let _B_ be Completion(Evaluation of |Block|).
1. <del>If _B_ is a throw completion, let _C_ be Completion(CatchClauseEvaluation of |Catch| with argument _B_.[[Value]]).</del>
1. <del>Else, let _C_ be _B_.</del>
1. <ins>If _B_ is a throw completion, then</ins>
1. <ins>Let _agentRecord_ be the surrounding agent's Agent Record.</ins>
1. <ins>Set _agentRecord_.[[ThrowAsyncContextMapping]] to ~empty~.</ins>
1. <ins>Let _C_ be Completion(CatchClauseEvaluation of |Catch| with argument _B_.[[Value]]).</ins>
1. <ins>Else,</ins>
1. <ins>Let _C_ be _B_.</ins>
1. Return ? UpdateEmpty(_C_, *undefined*).
</emu-alg>
<emu-grammar>TryStatement : `try` Block Finally</emu-grammar>
<emu-alg>
1. <ins>Let _agentRecord_ be the surrounding agent's AgentRecord.</ins>
1. Let _B_ be Completion(Evaluation of |Block|).
1. <ins>Let _throwAsyncContextMapping_ be _agentRecord_.[[ThrowAsyncContextMapping]].</ins>
1. Let _F_ be Completion(Evaluation of |Finally|).
1. <del>If _F_ is a normal completion, set _F_ to _B_.</del>
1. <ins>If _F_ is a normal completion, then</ins>
1. <ins>Set _agentRecord_.[[ThrowAsyncContextMapping]] to _throwAsyncContextMapping_.</ins>
1. <ins>Set _F_ to _B_.</ins>
1. Return ? UpdateEmpty(_F_, *undefined*).
</emu-alg>
<emu-grammar>TryStatement : `try` Block Catch Finally</emu-grammar>
<emu-alg>
1. <ins>Let _agentRecord_ be the surrounding agent's Agent Record.</ins>
1. Let _B_ be Completion(Evaluation of |Block|).
1. <del>If _B_ is a throw completion, let _C_ be Completion(CatchClauseEvaluation of |Catch| with argument _B_.[[Value]]).</del>
1. <del>Else, let _C_ be _B_.</del>
1. <ins>If _B_ is a throw completion, then</ins>
1. <ins>Set _agentRecord_.[[ThrowAsyncContextMapping]] to ~empty~.</ins>
1. <ins>Let _C_ be Completion(CatchClauseEvaluation of |Catch| with argument _B_.[[Value]]).</ins>
1. <ins>Else,</ins>
1. <ins>Let _C_ be _B_.</ins>
1. <ins>Let _throwAsyncContextMapping_ be _agentRecord_.[[ThrowAsyncContextMapping]].</ins>
1. Let _F_ be Completion(Evaluation of |Finally|).
1. <del>If _F_ is a normal completion, set _F_ to _C_.</del>
1. <ins>If _F_ is a normal completion, then</ins>
1. <ins>Set _agentRecord_.[[ThrowAsyncContextMapping]] to _throwAsyncContextMapping_.</ins>
1. <ins>Set _F_ to _C_.</ins>
1. Return ? UpdateEmpty(_F_, *undefined*).
</emu-alg>
</emu-clause>
</emu-clause>
</emu-clause>

<emu-clause id="sec-ecmascript-language-functions-and-classes">
<h1>ECMAScript Language: Functions and Classes</h1>

Expand Down Expand Up @@ -397,7 +464,7 @@ <h1>
1. Else,
1. <del>Return ? Call(_promiseCapability_.[[Resolve]], *undefined*, « _handlerResult_.[[Value]] »).</del>
1. <ins>Let _resolvingFunctionResult_ be Completion(Call(_promiseCapability_.[[Resolve]], *undefined*, « _handlerResult_.[[Value]] »)).</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_).</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_, _resolvingFunctionResult_).</ins>
1. <ins>Return _resolvingFunctionResult_.</ins>
1. Let _handlerRealm_ be *null*.
1. If _reaction_.[[Handler]] is not ~empty~, then
Expand Down Expand Up @@ -428,7 +495,7 @@ <h1>
1. If _thenCallResult_ is an abrupt completion, then
1. <del>Return ? Call(_resolvingFunctions_.[[Reject]], *undefined*, « _thenCallResult_.[[Value]] »).</del>
1. <ins>Let _rejectResult_ be Completion(Call(_resolvingFunctions_.[[Reject]], *undefined*, « _thenCallResult_.[[Value]] »)).</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_).</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_, _rejectResult_).</ins>
1. <ins>Return _rejectResult_.</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_).</ins>
1. Return ? _thenCallResult_.
Expand Down Expand Up @@ -679,7 +746,7 @@ <h1>
1. Assert: When we return here, _genContext_ has already been removed from the execution context stack and _methodContext_ is the currently running execution context.
1. <ins>If _previousContextMapping_ is not ~empty~, then</ins>
1. <ins>Assert: The result of AsyncContextSnapshot() is _generator_.[[GeneratorAsyncContextMapping]].</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_).</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_, _result_).</ins>
1. Return ? _result_.
</emu-alg>
</emu-clause>
Expand Down Expand Up @@ -718,7 +785,7 @@ <h1>
1. Assert: When we return here, _genContext_ has already been removed from the execution context stack and _methodContext_ is the currently running execution context.
1. <ins>If _previousContextMapping_ is not ~empty~, then</ins>
1. <ins>Assert: The result of AsyncContextSnapshot() is _generator_.[[GeneratorAsyncContextMapping]].</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_).</ins>
1. <ins>AsyncContextSwap(_previousContextMapping_, _result_).</ins>
1. Return ? _result_.
</emu-alg>
</emu-clause>
Expand Down Expand Up @@ -954,7 +1021,8 @@ <h1>
<emu-clause id="sec-asynccontextswap" type="abstract operation">
<h1>
AsyncContextSwap (
_snapshotMapping_: a List of Async Context Mapping Records
_snapshotMapping_: a List of Async Context Mapping Records,
optional _completion_: a Completion Record,
): a List of Async Context Mapping Records
</h1>
<dl class="header">
Expand All @@ -964,6 +1032,10 @@ <h1>
<emu-alg>
1. Let _agentRecord_ be the surrounding agent's Agent Record.
1. Let _asyncContextMapping_ be _agentRecord_.[[AsyncContextMapping]].
1. If _completion_ is present and it is an abrupt completion, then
1. If _agentRecord_.[[ThrowAsyncContextMapping]] is ~empty~, set it to _asyncContextMapping_.
1. Else,
1. Set _agentRecord_.[[ThrowAsyncContextMapping]] to ~empty~.
1. Set _agentRecord_.[[AsyncContextMapping]] to _snapshotMapping_.
1. Return _asyncContextMapping_.
</emu-alg>
Expand Down Expand Up @@ -1048,7 +1120,7 @@ <h1>AsyncContext.Snapshot.wrap ( _fn_ )</h1>
1. Let _thisArgument_ be the *this* value.
1. Let _previousContextMapping_ be AsyncContextSwap(_snapshot_).
1. Let _result_ be Completion(Call(_fn_, _thisArgument_, _args_)).
1. AsyncContextSwap(_previousContextMapping_).
1. AsyncContextSwap(_previousContextMapping_, _result_).
1. Return _result_.
1. Let _wrapped_ be CreateBuiltinFunction(_closure_).
1. Perform ? CopyNameAndLength(_wrapped_, _fn_, *"wrapped"*).
Expand Down Expand Up @@ -1084,7 +1156,7 @@ <h1>AsyncContext.Snapshot.prototype.run ( _func_, ..._args_ )</h1>
1. Perform ? RequireInternalSlot(_asyncSnapshot_, [[AsyncSnapshotMapping]]).
1. Let _previousContextMapping_ be AsyncContextSwap(_asyncSnapshot_.[[AsyncSnapshotMapping]]).
1. Let _result_ be Completion(Call(_func_, *undefined*, _args_)).
1. AsyncContextSwap(_previousContextMapping_).
1. AsyncContextSwap(_previousContextMapping_, _result_).
1. Return _result_.
</emu-alg>
</emu-clause>
Expand Down Expand Up @@ -1212,7 +1284,7 @@ <h1>AsyncContext.Variable.prototype.run ( _value_, _func_, ..._args_ )</h1>
1. Append _p_ to _asyncContextMapping_.
1. AsyncContextSwap(_asyncContextMapping_).
1. Let _result_ be Completion(Call(_func_, *undefined*, _args_)).
1. AsyncContextSwap(_previousContextMapping_).
1. AsyncContextSwap(_previousContextMapping_, _result_).
1. Return _result_.
</emu-alg>
</emu-clause>
Expand Down
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