Platform/JSDebugv2: Difference between revisions

= Design Principles for <b>js::dbg2</b> =

<ul>

<li><b>js::dbg2 must support remote debugging.</b> Using a protocol

resembling the [http://code.google.com/p/v8/wiki/DebuggerProtocol V8 debugger protocol], js::dbg2 should allow the debugger's user interface to

debuggee. This allows us to debug on mobile devices and worker threads, and

increases the segregation of debugger and debuggee.

<li><b>js::dbg2 will support cross-thread debugging via remote

debugging.</b> The "server" for the remote protocol will be lightweight

mediated by the remote protocol, greatly simplifying js::dbg2's

implementation.

<p>(Note that some operations are inherently cross-thread: enumerating

currently running threads; thread creation notifications; the initial

attachment of the debugger to a thread. But once a thread has been attached

to, all subsequent communication is via the remote protocol.)</p>

<li><b>js::dbg2 must operate at the JavaScript source language level.</b>

SpiderMonkey's current debugging interfaces (jsdbgapi and jsd) are built

program directly to the original JavaScript program --- not to the state of

imaginary bytecode, which is then related to the original JavaScript.

</ul>