[Bug record/31911] New: Execution history should be saved per inferior

["blarsen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31911

            Bug ID: 31911
           Summary: Execution history should be saved per inferior
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: record
          Assignee: unassigned at sourceware dot org
          Reporter: blarsen at redhat dot com
  Target Milestone: ---

The record subsystem was added to gdb before we could handle multiple inferior.
As such, it was enough to have a global variable that stored things like the
the execution history, the amount of instruction saved and so on (see list of
global variables in gdb/record-full.c).

All this information should be saved on a per-inferior basis. One way to do it
is putting it inside the "class inferior" in gdb/inferior.h; either saving them
directly, or using gdb's registry system (though I'm not sure I like this
second option). Another possibility would be saving the history in the record
target, if information saved in the target is not duplicated across inferiors.

This will improve our ability to record one or many inferiors at once.

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