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Original commit message:
[api] Make running scripts in AddMessageListener callback work in debug mode
The existance of an `AllowJavascriptExecutionDebugOnly` scope in
`Isolate::ReportPendingMessages()` indicates that the API supports
running arbitrary JS code in a `AddMessageListener` callback.
Currently, this can fail in debug mode: The
`!isolate->external_caught_exception()` condition is checked when
entering API methods inside such a handler. However, if there is
a verbose `TryCatch` active when the exception occurs, this
check fails, and when calling `ToString()` on the exception object
leaves a pending exception itself, the flag is re-set to `true`.
Fix this problem by clearing the flag and the pending exception if
there was one during `ToString()`. This matches the code a few lines
up in `messages.cc`, so the exception state is now consistent
during the callback.
This currently makes a Node.js test fail in debug mode
(`parallel/test-error-reporting`).
Bug: node:7144
Bug: node:17016
Change-Id: I060d00fea3e9a497f4df34c6ff8d6e29ebe96321
Reviewed-on: https://chromium-review.googlesource.com/718096
Commit-Queue: Yang Guo <[email protected]>
Reviewed-by: Yang Guo <[email protected]>
Cr-Commit-Position: refs/heads/master@{#49466}
Refs: v8/v8@09b53ee
PR-URL: #21767
Refs: v8/v8@09b53ee
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Myles Borins <[email protected]>
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