Files
servo/components/script_bindings/webidls/DebuggerPauseEvent.webidl
eri 151074e9a1 devtools: Handle pause in the debugger (#42007)
Add an event listener for `pause` to `debugger.js` and the necessary
glue to access it from the `devtools` crate. This returns important
information to know where we are paused, such as the source location and
frame state.

Fix frame and object actor encoding into messages. Use information from
`debugger.js` to correctly fill the fields.

Add a new `frames` list to the thread actor and handle the `frames`
message.

Fix `getEnvironment` reply in the frame actor. It is out of form (has a
`type` field but it doesn't require a followup empty message, it already
counts as a reply), so we need to handle it specially.

Note: For now we are focusing on the protocol side of the debugger, and
this patch only shows where the pause would happen. Pausing Servo itself
will happen in a followup.

![Debugger showing the line where execution would be
paused](https://github.com/user-attachments/assets/c007f205-0ccd-47f1-ad0b-81b7415e8211)

Testing: `mach test-devtools` and manual testing. No errors (apart from
#42006).
Part of: #36027

---------

Signed-off-by: eri <eri@igalia.com>
Co-authored-by: atbrakhi <atbrakhi@igalia.com>
Co-authored-by: Josh Matthews <josh@joshmatthews.net>
2026-01-19 19:27:52 +00:00

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
// This interface is entirely internal to Servo, and should not be accessible to
// web pages.
[Exposed=DebuggerGlobalScope]
interface DebuggerPauseEvent : Event {};
partial interface DebuggerGlobalScope {
undefined getFrameResult(
DebuggerPauseEvent event,
PauseFrameResult result);
};
dictionary PauseFrameResult {
required unsigned long column;
required DOMString displayName;
required unsigned long line;
required boolean onStack;
required boolean oldest;
required boolean terminated;
required DOMString type_;
required DOMString url;
};