I tried printing error.descryption, but it didn't work, because when the error
happens, it seems ReadPointerFromMemory never returned to my code.
read from address 0000000001223f68
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "/home/leikong/repo/WindowsFabric/build.prod/test/fabdbg.py", line 289,
in findall
findtypes(pattern,ignorePureVirtualType)
File "/home/leikong/repo/WindowsFabric/build.prod/test/fabdbg.py", line 246,
in findtypes
if ignorePureVirtualType and has_pure_virtual(vtableAddr, pureVirtualFuncs)
:
File "/home/leikong/repo/WindowsFabric/build.prod/test/fabdbg.py", line 190,
in has_pure_virtual
vtableEndAddr = lldb.process.ReadPointerFromMemory(vtableAddr-8, error)
File "/home/leikong/bin/lldb/lib/python2.7/site-packages/lldb/__init__.py",
line 9418, in ReadPointerFromMemory
return _lldb.SBProcess_ReadPointerFromMemory(self, addr, error)
OverflowError: in method 'SBProcess_ReadPointerFromMemory', argument 2 of type
'lldb::addr_t'
> Subject: Re: [lldb-dev] OverflowError: in method
> 'SBProcess_ReadPointerFromMemory', argument 2 of type 'lldb::addr_t'
> From: jing...@apple.com
> Date: Fri, 16 Sep 2016 17:12:24 -0700
> CC: lldb-dev@lists.llvm.org
> To: leik...@msn.com
>
> You passed an error into ReadPointerFromMemory. In the cases where you
> aren't getting what you expect, what does that error say?
>
> Jim
>
> > On Sep 16, 2016, at 5:06 PM, Lei Kong via lldb-dev
> > <lldb-dev@lists.llvm.org> wrote:
> >
> > I ran into the error in the subject when running a python script with
> > "script myfile.myscript()".
> >
> > The value addr_t parameter used is 0x0000000001223f68, the following works
> > fine:
> >
> > (lldb) scr
> > Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D.
> > >>> e = lldb.SBError()
> > >>> ptr = lldb.process.ReadPointerFromMemory(0x0000000001223f68, e)
> > >>> print ptr
> > 0
> > >>>
> >
> > Any suggestion how to further investigate? Thanks.
> >
> > myfile.myscript() calls the following function in a loop (iterate through
> > all vtable symbols), which contains the call ReadPointerFromMemory.
> >
> > def dump_vtbl(vtableAddr) :
> > error = lldb.SBError()
> > vtableEndAddr = lldb.process.ReadPointerFromMemory(vtableAddr+8, error)
> > if not error.success :
> > return False
> > print "vtable: [%0.16x, %0.16x)" % (vtableAddr, vtableEndAddr)
> > for addr in range(vtableAddr, vtableEndAddr, 8) :
> > print "read from address %.016x" % addr
> > try:
> > funcAddr = lldb.process.ReadPointerFromMemory(addr, error)
> > except:
> > sys.exc_clear()
> > continue
> > if not error.success :
> > continue
> >
> > _______________________________________________
> > lldb-dev mailing list
> > lldb-dev@lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
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