[Webkit-unassigned] [Bug 135663] New: Web Inspector: support replaying to arbitrary debugger positions

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Aug 6 12:04:50 PDT 2014


           Summary: Web Inspector: support replaying to arbitrary debugger
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: burg at cs.washington.edu
                CC: timothy at apple.com, joepeck at webkit.org,
                    webkit-bug-importer at group.apple.com,
                    graouts at webkit.org

We should be able to revert back to any position that the debugger is in.
In past prototypes, we have called this concept "savepoints", "bookmarks", or "checkpoints".

Savepoints have coordinates of <event loop input, breakpoint, debugger walk>.

The algorithm is:
0. During normal replay, keep records of how many times a breakpoint is hit per event loop input.
1. replay to the preceding event loop input and pause playback
2. enable the debugger and set the preceding breakpoint which was hit
3. unpause playback, then that breakpoint
4. replay the series of debugger commands that led to the terminal state.

This feature may be split into smaller bugs. It requires no new backend support.

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