Rebase our patchset onto Delve v1.21.0 #44
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In Undo, debuggee state is immutable during replay, so reading the G pointer via code injection won't work; and in any case, this approach is simpler.
* Update the documentation to mention UDB or LiveRecorder alongside rr. * Add makefile support for testing the Undo backend. * Add DLV_RECORD_REPLAY_BACKEND environment variable which overrides the record-replay backend, for use in GoLand. * Implement checkpoints as a map from checkpoint number to time. * Suppress resume call after restart. * Implement "when" command using "get_time" serial command. * Implement call injection using "set_debuggee_volatile". * Implement "restart" using "goto_time". * Enable or disable Undo backend appropriately in test cases.
This fixes a bug in which it was not possible to reverse debug after a stepping operation e.g. next encountered the end of recorded history.
The error handling here was a bit painful but only needs doing in these two places (for now).
This is made compatible with UDB's bookmarks by using the UDB bookmark name as the "Note" field in Delve. To save Delve checkpoints, the "Note" must be made unique, so as to be a valid bookmark name in UDB.
mark-undoio
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Rebase our patchset onto the new Delve v1.21.0 release. This contains no behavioural changes, other than those directly caused by the move to v1.21.0 as a base version.
The code structure is changed to simplify the structure of our patchsets, with refactors and bug fixes squashed in where appropriate.
Where certain areas of Undo functionality could be made into logically separate commits I have kept them distinct. Where bug fixes appear to be to core Delve behaviour I have also kept them separate.