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From: Sergey Kaplun via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: Igor Munkin <imun@tarantool.org>, tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH luajit v1] tools: fix luajit-gdb stack dump
Date: Wed, 21 Jul 2021 12:02:27 +0300
Message-ID: <YPfio8QXeYJWrxyv@root> (raw)
In-Reply-To: <YPffroa3BrtPJ/Ru@root>

Sorry, one more change:
Fix allignment in the commit message:

| gdb: fix dump stack without function frame
|
| Dummy frame is the "initial" coroutine state, when the framelink slot
| (i.e. L->base - (1 + LJ_FR2)) is the bottom slot of the guest stack
| (i.e. L->stack). Since coroutine stack unwinding is implemented via
| precondition loop, lj-stack doesn't dump the slots for the dummy frame,
| since the framelink points to the stack bottom.
|
| The output looks like the following:
|
| | 0x7fb512ac40:0x7fb512ac70 [    ] 7 slots: Red zone
| | 0x7fb512ac38              [   M]
| | 0x7fb512ab28:0x7fb512ac30 [    ] 34 slots: Free stack slots
| | 0x7fb512ab20              [  T ]
| | 0x7fb512ab08:0x7fb512ab10 [S   ] FRAME: dummy L
|
| Python doesn't provide post-condition (do-while) syntax construction,
| that fits better for this case, so the unwinding of the topmost frame is
| just manually unrolled.
|
| As a result of the patch the output looks like the following:
|
| | 0x7fb512ac40:0x7fb512ac70 [    ] 7 slots: Red zone
| | 0x7fb512ac38              [   M]
| | 0x7fb512ab28:0x7fb512ac30 [    ] 34 slots: Free stack slots
| | 0x7fb512ab20              [  T ]
| | 0x7fb512ab18              [    ] VALUE: string 0 "/tmp/net_box.lua:6: err in ser" @ 0x7fb512ade8
| | 0x7fb512ab10              [ B  ] VALUE: table @ 0x7fb512ac80 (asize: 0, hmask: 0x0)
| | 0x7fb512ab00:0x7fb512ab08 [S   ] FRAME: dummy L


-- 
Best regards,
Sergey Kaplun

  parent reply	other threads:[~2021-07-21  9:03 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-18  6:22 Sergey Kaplun via Tarantool-patches
2021-07-05  7:03 ` Sergey Kaplun via Tarantool-patches
2021-07-20 12:29 ` Igor Munkin via Tarantool-patches
2021-07-21  8:49   ` Sergey Kaplun via Tarantool-patches
2021-07-21  8:54     ` Igor Munkin via Tarantool-patches
2021-07-22 10:32       ` Sergey Ostanevich via Tarantool-patches
2021-07-22 11:48         ` Igor Munkin via Tarantool-patches
2021-07-22 12:51           ` Sergey Ostanevich via Tarantool-patches
2021-07-21  9:02     ` Sergey Kaplun via Tarantool-patches [this message]
2021-07-22 13:34 ` Igor Munkin via Tarantool-patches

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