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This fixes a failure in the v8.x test suite in CI in debug mode. The test is marked flaky, but CI still shows up red for some reason – let’s fix that by actually adressing the bug :)


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 <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49466}

Refs: v8/v8@09b53ee

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 <yangguo@chromium.org>
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{nodejs#49466}

Refs: v8/v8@09b53ee
@nodejs-github-bot nodejs-github-bot added v8 engine Issues and PRs related to the V8 dependency. v8.x labels Jul 11, 2018
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LGTM

MylesBorins pushed a commit that referenced this pull request Jul 13, 2018
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 <yangguo@chromium.org>
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#49466}

Refs: v8/v8@09b53ee

PR-URL: #21767
Refs: v8/v8@09b53ee
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
@MylesBorins
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landed in 873ee2e

rvagg pushed a commit that referenced this pull request Aug 16, 2018
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 <yangguo@chromium.org>
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#49466}

Refs: v8/v8@09b53ee

PR-URL: #21767
Refs: v8/v8@09b53ee
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
@MylesBorins MylesBorins mentioned this pull request Aug 16, 2018
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4 participants