[lldb-dev] GetSymbolContext(lldb.eSymbolContextEverything)

Kamenee Arumugam via lldb-dev lldb-dev at lists.llvm.org
Fri Jun 17 11:34:31 PDT 2016


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

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.

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import lldb
import os

triple = "x86_64"
def disassemble_instructions(insts):
    for i in insts:
        print i

# Set the path to the executable to debug
exe = "buffer"

# Create a new debugger instance
debugger = lldb.SBDebugger.Create()

# When we step or continue, don't return from the function until the process
# stops. Otherwise we would have to handle the process events ourselves which, while doable is
#a little tricky.  We do this by setting the async mode to false.
debugger.SetAsync (False)

# Create a target from a file and arch
print "Creating a target for '%s'" % exe

target = debugger.CreateTargetWithFileAndArch (exe, lldb.LLDB_ARCH_DEFAULT)

if target:
    # If the target is valid set a breakpoint at main
    main_bp = target.BreakpointCreateByName ("main",target.GetExecutable().GetFilename());

    #print main_bp

    # Launch the process. Since we specified synchronous mode, we won't return
    # from this function until we hit the breakpoint at main
    process = target.LaunchSimple (None, None, os.getcwd())

    # Make sure the launch went ok
    if process:
        # Print some simple process info
        state = process.GetState ()
        #print process
        if state == lldb.eStateStopped:
            # Get the first thread
            thread = process.GetThreadAtIndex (0)
            if thread:
                # Print some simple thread info
                #print thread
                # Get the first frame
                    frame = thread.GetFrameAtIndex (0)
                #if frame:
                    # Print some simple frame info
                    # Print some simple frame info
                    #print frame
                    #function = frame.GetFunction()
                    #variable = frame.GetVariables(target,True,True,True)
                    module = target.GetModuleAtIndex(0)
                    target.SetSectionLoadAddress(module.FindSection("__TEXT"), 0x100000000)
                    module = target.AddModule ("/usr/lib/system/libsystem_c.dylib", triple, None, "/build/server/a/libsystem_c.dylib.dSYM")
                    target.SetSectionLoadAddress(module.FindSection("__TEXT"), 0x7fff83f32000)
                    module = target.AddModule ("/usr/lib/system/libsystem_dnssd.dylib", triple, None, "/build/server/b/libsystem_dnssd.dylib.dSYM")
                    target.SetSectionLoadAddress(module.FindSection("__TEXT"), 0x7fff883db000)
                    module = target.AddModule ("/usr/lib/system/libsystem_kernel.dylib", triple, None, "/build/server/c/libsystem_kernel.dylib.dSYM")
                    target.SetSectionLoadAddress(module.FindSection("__TEXT"), 0x7fff8c0dc000)
                    load_addr = 0x0000000004005a6
                    so_addr = target.ResolveLoadAddress(load_addr)
                    sym_ctx = so_addr.GetSymbolContext(lldb.eSymbolContextEverything)
                    print sym_ctx

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