[lldb-dev] [Bug 25070] SBThread::ReturnFromFrame does not work

[via lldb-dev]

https://llvm.org/bugs/show_bug.cgi?id=25070

Jakub Beránek  changed:

   What|Removed |Added

 Status|RESOLVED|REOPENED
 Resolution|INVALID |---

--- Comment #3 from Jakub Beránek  ---
I tried to use StepOut, but it also doesn't seem to work.

import lldb
import os
import time

debugger = lldb.SBDebugger.Create()
target = debugger.CreateTarget("./test")
target.BreakpointCreateByLocation("test.cpp", 3)
process = target.LaunchSimple([], [], os.getcwd())

time.sleep(2) # wait for bp to be hit

thread = process.GetSelectedThread()
thread.StepOut()
value = thread.GetStopReturnValue() # No value

When I print the thread (print(thread)), it shows the stop reason and value:
"stop reason = step out\nReturn value: (int) $0 = 11", but I can't get the
value from the thread directly (both return_value and GetStopReturnValue()
return No value). And after the step out, the frames from the thread disappear
(before step out, the thread had 6 stack frames, after step out, all of them
disappeared).

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[lldb-dev] [Bug 25081] New: SBThread::is_stopped shows incorrect value

[via lldb-dev]

https://llvm.org/bugs/show_bug.cgi?id=25081

Bug ID: 25081
   Summary: SBThread::is_stopped shows incorrect value
   Product: lldb
   Version: unspecified
  Hardware: PC
OS: Linux
Status: NEW
  Severity: normal
  Priority: P
 Component: All Bugs
  Assignee: lldb-dev@lists.llvm.org
  Reporter: beryku...@gmail.com
CC: llvm-b...@lists.llvm.org
Classification: Unclassified

Created attachment 15016
  --> https://llvm.org/bugs/attachment.cgi?id=15016=edit
C++ source code that loops endlessly

I'm using lldb 3.8 built from trunk. When I stop the process, it stops all the
threads, but their attribute is_stopped is not set properly. I've attached a
simple C++ source code that loops endlessly.

import lldb
import os
import time

debugger = lldb.SBDebugger.Create()
target = debugger.CreateTarget("./test")
process = target.LaunchSimple([], [], os.getcwd())

time.sleep(1)

process.Stop()

time.sleep(1)

for t in process:
assert t.is_stopped

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[lldb-dev] [Bug 25070] New: SBThread::ReturnFromFrame does not work

[via lldb-dev]

https://llvm.org/bugs/show_bug.cgi?id=25070

Bug ID: 25070
   Summary: SBThread::ReturnFromFrame does not work
   Product: lldb
   Version: unspecified
  Hardware: PC
OS: Linux
Status: NEW
  Severity: normal
  Priority: P
 Component: All Bugs
  Assignee: lldb-dev@lists.llvm.org
  Reporter: beryku...@gmail.com
CC: llvm-b...@lists.llvm.org
Classification: Unclassified

Created attachment 15010
  --> https://llvm.org/bugs/attachment.cgi?id=15010=edit
C++ source with test program

I'm using lldb 3.8 compiled from trunk, but I also experienced this issue in
lldb-3.6.

When I use SBThread::ReturnFromFrame when in a C++ function that returns some
value, the SBValue doesn't get set, even though no error is returned. Is this
function currently implemented?
https://github.com/llvm-mirror/lldb/blob/f2d745d54e1903f72190f767633af481f61ff0c2/source/Target/Thread.cpp#L1921
seems to imply that it's not.

Example script (I attached the C++ source test.cpp):

import lldb
import os
import time

debugger = lldb.SBDebugger.Create()
target = debugger.CreateTarget("./test")
target.BreakpointCreateByLocation("test.cpp", 3)
process = target.LaunchSimple([], [], os.getcwd())

time.sleep(1) # wait for bp to be hit

thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
value = lldb.SBValue()
error = thread.ReturnFromFrame(frame, value)
# error is marked as sucesss, but value contains nothing

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