[lldb-dev] OverflowError: in method 'SBProcess_ReadPointerFromMemory', argument 2 of type 'lldb::addr_t'

[Jim Ingham via lldb-dev]

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 at 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
> 
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