I just tried with latest delve, and 'p runtime.m0.curg' is enough:
(dlv) p runtime.m0.curg
*runtime.g nil
(dlv) break main.main
(dlv) continue
[...]
(dlv) p runtime.m0.curg
*runtime.g {
stack: runtime.stack {lo: 824635269120, hi: 824635285504},
stackguard0: 824635270000,
stackguard1: 18446744073709551615,
_panic: *runtime._panic nil,
_defer: *runtime._defer {
siz: 8,
started: false,
sp: 824635285400,
pc: 4406401,
fn: *(*runtime.funcval)(0xd49398),
_panic: *runtime._panic nil,
link: *runtime._defer nil,},
m: *runtime.m {
g0: *(*runtime.g)(0x1493020),
morebuf: (*runtime.gobuf)(0x1493b08),
divmod: 0,
procid: 8426,
gsignal: *(*runtime.g)(0xc000000000),
goSigStack: (*runtime.gsignalStack)(0x1493b58),
sigmask: runtime.sigset [0,0],
tls: [6]uintptr [0,0,0,0,0,0],
mstartfn: nil,
curg: *(*runtime.g)(0xc000000180),
caughtsig: 0,
p: 824633933824,
nextp: 0,
oldp: 0,
id: 0,
mallocing: 0,
throwing: 0,
preemptoff: "",
locks: 0,
dying: 0,
profilehz: 0,
spinning: false,
blocked: false,
inwb: false,
newSigstack: true,
printlock: 0,
incgo: false,
freeWait: 0,
fastrand: [2]uint32 [1474176035,2600743942],
needextram: false,
traceback: 0,
ncgocall: 1,
ncgo: 0,
cgoCallersUse: 0,
cgoCallers: *runtime.cgoCallers
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
park: (*runtime.note)(0x1493c48),
alllink: *runtime.m nil,
schedlink: 0,
mcache: *(*runtime.mcache)(0x7fc8210fe008),
lockedg: 0,
createstack: [32]uintptr
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
lockedExt: 0,
lockedInt: 0,
nextwaitm: 0,
waitunlockf: unsafe.Pointer(0x0),
waitlock: unsafe.Pointer(0x0),
waittraceev: 23,
waittraceskip: 3,
startingtrace: false,
syscalltick: 4,
thread: 0,
freelink: *runtime.m nil,
libcall: (*runtime.libcall)(0x1493db8),
libcallpc: 0,
libcallsp: 0,
libcallg: 0,
syscall: (*runtime.libcall)(0x1493e00),
vdsoSP: 0,
vdsoPC: 5077558,
mOS: runtime.mOS {},},
sched: runtime.gobuf {sp: 0, pc: 4586608, g: 824633721216, ctxt:
unsafe.Pointer(0x0), ret: 0, lr: 0, bp: 824635273744},
syscallsp: 0,
syscallpc: 5004501,
stktopsp: 824635285472,
param: unsafe.Pointer(0x0),
atomicstatus: 2,
stackLock: 0,
goid: 1,
schedlink: 0,
waitsince: 0,
waitreason: waitReasonChanReceive (13),
preempt: false,
paniconfault: false,
preemptscan: false,
gcscandone: false,
gcscanvalid: false,
throwsplit: false,
raceignore: 0,
sysblocktraced: true,
sysexitticks: 0,
traceseq: 0,
tracelastp: 0,
lockedm: 0,
sig: 0,
writebuf: []uint8 len: 0, cap: 0, nil,
sigcode0: 0,
sigcode1: 0,
sigpc: 0,
gopc: 4586345,
ancestors: *[]runtime.ancestorInfo nil,
startpc: 4406160,
racectx: 0,
waiting: *runtime.sudog nil,
cgoCtxt: []uintptr len: 0, cap: 0, nil,
labels: unsafe.Pointer(0x0),
timer: *runtime.timer nil,
selectDone: 0,
gcAssistBytes: 0,}
On Tuesday, November 12, 2019 at 8:29:42 AM UTC+1, Xiangdong JI wrote:
>
> Hi Derek,
>
> Say I have the pointer value of a specific G struct, how to convert it to
> 'struct g' (or any other form) in delve so that I can check
> the details of its fields?
>
> For example (simply utilized runtime.m0.curg to get a pointer value here)
>
> (dlv) p &runtime.m0.curg
> (**runtime.g)(0x56a140)
>
> Just tried a few commands to convert the value back to 'struct g' or a
> pointer to 'struct g'
>
> (dlv) p (runtime.g*)(0x56b140)
> Command failed: 1:12: expected operand, found ')'
> (dlv) p ('runtime.g'*)(0x56b140)
> Command failed: 1:2: illegal rune literal
> (dlv) p ("runtime.g"*)(0x56b140)
> Command failed: 1:14: expected operand, found ')'
> (dlv) p ("runtime".g*)(0x56b140)
> Command failed: 1:14: expected operand, found ')'
>
> Thanks.
>
> On Tuesday, November 12, 2019 at 2:28:12 AM UTC+8, Derek Parker wrote:
>>
>> Can you reply with a gist showing the exact Delve commands you are
>> attempting to use and what errors are being returned?
>>
>> There is some more information on the expression parser here
>> <https://github.com/go-delve/delve/blob/master/Documentation/cli/expr.md>.
>> You can also open an issue on the Delve Github repo and we can help you out
>> over there as well.
>>
>> On Sunday, November 10, 2019 at 11:58:24 PM UTC-8, Xiangdong JI wrote:
>>>
>>> Given a valid goroutine structure's pointer, say retrieving from the
>>> register 'g', how can I convert it to 'struct g' in delve or gdb?
>>>
>>> gdb usually reports "A syntax error in expression ...", and delve issues
>>> various "Command failed" message (failed to figure the proper way of
>>> converting a literal, I guess).
>>>
>>> Thanks.
>>>
>>
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