Re: [reverse RFC] Add documentation for process record and replay

teawater
2008-10-16T07:35:51Z

[-- Attachment #1: Type: text/plain, Size: 701 bytes --]

Hi,

According to the suggestions. I make a new patch.

2008-10-16 Hui Zhu <teawater@gmail.com>

* gdb.texinfo: Add documentation for process record and replay.

Thanks,
Hui

On Thu, Oct 16, 2008 at 15:04, teawater <teawater@gmail.com> wrote:
> Great! I will change it.
>
> On Thu, Oct 16, 2008 at 15:01, Eli Zaretskii <eliz@gnu.org> wrote:
>>> Date: Thu, 16 Oct 2008 10:09:33 +0800
>>> From: teawater <teawater@gmail.com>
>>> Cc: "Michael Snyder" <msnyder@vmware.com>, gdb-patches@sourceware.org
>>>
>>> How about change it to "if the next instruction has the execution log for it"?
>>
>> I think this is better:
>>
>> if the execution log includes the record for the next instruction, ...
>>
>

[-- Attachment #2: rec_doc.txt --]
[-- Type: text/plain, Size: 4835 bytes --]

--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2008-10-16 Hui Zhu <teawater@gmail.com>
+
+ * gdb.texinfo: Add documentation for process record and replay.
+
2008-09-30 Michael Snyder <msnyder@vmware.com>

* gdb.texinfo: Add documentation for reverse execution.
--- a/gdb.texinfo
+++ b/gdb.texinfo
@@ -144,6 +144,7 @@ software in general. We will miss him.
* Running:: Running programs under @value{GDBN}
* Stopping:: Stopping and continuing
* Reverse Execution:: Running programs backward
+* Process record and replay:: Recording programs running message and replay it
* Stack:: Examining the stack
* Source:: Examining source files
* Data:: Examining data
@@ -4963,6 +4964,101 @@ This is the default.
@end table

+@node Process record and replay
+@chapter Recording programs running message and replay it
+@cindex process record and replay
+@cindex recording programs running message and replay it
+
+In a architecture environment that supports process record and replay,
+process record and replay target can record a log of the process execution,
+and replay it with both forward and reverse execute commands.
+
+When this target is in use, if the execution log includes the record for
+the next instruction, @value{GDBN} will debug in replay mode so that all the
+execution events are taken from the execution log. Otherwise, @value{GDBN}
+will debug in record mode and record the execution log while executing
+normally.
+
+If you are debugging in a architecture environment that supports
+process record and replay, @value{GDBN} provides the following commands.
+
+@table @code
+@kindex target record
+@kindex record
+@kindex rec
+@item target record
+This a standard command to start process record and replay target.
+Process record and replay target can only debug a process that already
+running. Therefore you need to first start the process @code{run},
+and then start the recording @code{record}.
+
+@kindex stoprecord
+@kindex sr
+@item stoprecord
+Stop process record and replay target at once. When Process record and
+replay target stops, all the execution log will be deleted and the inferior
+will either be terminated, or remain in its final state.
+
+When you stop the process record and replay target in record mode (at the
+end of the execution log), the inferior will be stopped at the next
+instruction that would have been recorded. In other words, if you record
+for a while and then stop recording, the inferior process will be left in
+the same state as if recording never happened.
+
+On the other hand, if the process record and replay target is stopped while
+in replay mode (that is, not at the end of the execution log but at some
+earlier point), the inferior process will become "live" at that earlier state,
+and it will then be possible to continue debugging the process "live" from
+that state.
+
+When the inferior process exits, or @value{GDBN} detaches from it, process
+record and replay target will automatically stop itself.
+
+@kindex set record-insn-number-max @var{limit}
+@item set record-insn-number-max @var{limit}
+Set the limit of instructions to be recorded. Default value is 200000.
+
+In this case, if record instructions number is bigger than @var{limit},
+@value{GDBN} will auto delete the earliest recorded instruction execute
+log.
+
+If set to 0, @value{GDBN} will not delete the earliest recorded instruction
+execute log. Record instructions number limit function will disable.
+
+@kindex show record-insn-number-max
+@item show record-insn-number-max
+Show the value of recorded instructions limit.
+
+@kindex set record-stop-at-limit
+@item set record-stop-at-limit
+@item set record-stop-at-limit on
+Set the behavior when record instructions limit is reached.
+This is the default mode. Meaning that @value{GDBN} will stop ask user
+want close @code{record-stop-at-limit} or stop inferior.
+
+@itemx set record-stop-at-limit off
+This mean that @value{GDBN} will auto delete the oldest record to make
+room for each new one.
+
+@kindex show record-stop-at-limit
+@item show record-stop-at-limit
+Show the value of record-stop-at-limit.
+
+@kindex info record-insn-number
+@item info record-insn-number
+Show the current number of recorded instructions.
+
+@kindex delrecord
+@kindex dr
+@item delrecord
+When record target running in replay mode ("in the past"), delete the
+subsequent execution log and begin to record a new execution log starting
+from the current address. This has much the same effect as "changing the past"
+(see "Set values of variables", above); it means you will abandon the
+previously recorded "future" and begin recording a new "future".
+@end table
+
+
@node Stack
@chapter Examining the Stack