We currently don't expose this information through the API, though we could.
You could add a new method to SBValue:
namespace lldb
{
class SBValue
{
SBData GetDWARFLocation();
}
};
This could return the DWARF location as a SBData object. Then you could consume
the data by parsing the DWARF DW_OP enumerations. Otherwise you can parse the
textual output of the "image lookup -va 0x123" command:
result = lldb.SBCommandReturnObject()
ci = debugger.GetCommandInterpreter()
ci.HandleCommand("image lookup -va %#x" % (frame.GetPC()), result, False)
# Now all output from the above command is in "result"
output = result.GetOutput()
# Parse "output" for variable locations
> On Jun 21, 2016, at 9:07 AM, Kamenee Arumugam <[email protected]> wrote:
>
> Hi Greg,
>
> Thanks for your reply. I did try the method you mention above but
> variable.GetLocation() only provide me the memory address of the variable.
> What exactly I am looking for was the register offset that stores variable i
> here. Example, I am looking for method able to output the one highlighted in
> yellow:
>
> Variable: id = {0x000000a2}, name = "i", type= "int", location =
> DW_OP_fbreg(-564), decl = ivm_demo.c:6
>
>
> Basically, I am working on a binary instrumentation research tool, that will
> inject code to check changes on selected variable. Therefore, using register
> offset, I am able to inject check for instruction using this register with
> this offset.
> Please let me know if you have any better method to grab register offset for
> particular variable.
>
> Thanks,
> Kamenee
>
> On Mon, Jun 20, 2016 at 7:15 PM, Greg Clayton <[email protected]> wrote:
> The variables are available through the frame in your symbol context. You
> have a line of code commented out in your script:
>
> #variable = frame.GetVariables(target,True,True,True)
>
> Change it to:
>
> get_arguments = True # Get argument variables
> get_locals = True # Get local variables
> get_statics = True # Get globals and static variables
> get_in_scope_only = True # only get variables that are in scope
> use_dynamic = lldb.eDynamicDontRunTarget # Get dynamic types for variables
> variables = frame.GetVariables (get_arguments, get_locals, get_statics,
> get_in_scope_only, use_dynamic)
> print variables
>
> This output will look different from the output in "image lookup --address
> 0x... --verbose" because we have an actual frame here so we can dump the
> variable value itself because we have a stack frame that allows us to have
> variable values. If you want the location of the variable you can also print
> that in a for loop using "variables" from above:
>
> for variable in variables:
> print str(variable)
> print "Location = %s" % (variable.GetLocation())
>
>
> Each "variable" object is a lldb.SBValue type. There are many API calls on
> these that you can call manually depending on what you want. Let me know if
> you have any questions.
>
> Greg Clayton
>
>
>
>
> > On Jun 17, 2016, at 11:34 AM, Kamenee Arumugam via lldb-dev
> > <[email protected]> wrote:
> >
> > Hi,
> >
> > I am trying program using Lldb Python API to get an output exactly same
> > when I run this command "image lookup --address 0x0000000405a6 --verbose".
> > But when I print return value of
> > GetSymbolContext(lldb.eSymbolContextEverything), it doesnt contain the
> > decoding of local variables which the above commands can print out local
> > variables.
> >
> > I have attached a simple script.py that I have developed. It is not
> > possible to print out local variables using the APIs or I am missing
> > something out?
> >
> > I am looking forward to hear from you soon.
> >
> > Thanks,
> > kmn
> > <script.txt>_______________________________________________
> > lldb-dev mailing list
> > [email protected]
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
>
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