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from __future__ import print_function
import lldb
import re
def parse_linespec(linespec, frame, result):
"""Handles a subset of GDB-style linespecs. Specifically:
number - A line in the current file
+offset - The line /offset/ lines after this line
-offset - The line /offset/ lines before this line
filename:number - Line /number/ in file /filename/
function - The start of /function/
*address - The pointer target of /address/, which must be a literal (but see `` in LLDB)
We explicitly do not handle filename:function because it is ambiguous in Objective-C.
This function returns a list of addresses."""
breakpoint = None
target = frame.GetThread().GetProcess().GetTarget()
matched = False
if (not matched):
mo = re.match("^([0-9]+)$", linespec)
if (mo is not None):
matched = True
# print "Matched <linenum>"
line_number = int(mo.group(1))
line_entry = frame.GetLineEntry()
if not line_entry.IsValid():
result.AppendMessage(
"Specified a line in the current file, but the current frame doesn't have line table information.")
return
breakpoint = target.BreakpointCreateByLocation(
line_entry.GetFileSpec(), line_number)
if (not matched):
mo = re.match("^\+([0-9]+)$", linespec)
if (mo is not None):
matched = True
# print "Matched +<count>"
line_number = int(mo.group(1))
line_entry = frame.GetLineEntry()
if not line_entry.IsValid():
result.AppendMessage(
"Specified a line in the current file, but the current frame doesn't have line table information.")
return
breakpoint = target.BreakpointCreateByLocation(
line_entry.GetFileSpec(), (line_entry.GetLine() + line_number))
if (not matched):
mo = re.match("^\-([0-9]+)$", linespec)
if (mo is not None):
matched = True
# print "Matched -<count>"
line_number = int(mo.group(1))
line_entry = frame.GetLineEntry()
if not line_entry.IsValid():
result.AppendMessage(
"Specified a line in the current file, but the current frame doesn't have line table information.")
return
breakpoint = target.BreakpointCreateByLocation(
line_entry.GetFileSpec(), (line_entry.GetLine() - line_number))
if (not matched):
mo = re.match("^(.*):([0-9]+)$", linespec)
if (mo is not None):
matched = True
# print "Matched <filename>:<linenum>"
file_name = mo.group(1)
line_number = int(mo.group(2))
breakpoint = target.BreakpointCreateByLocation(
file_name, line_number)
if (not matched):
mo = re.match("\*((0x)?([0-9a-f]+))$", linespec)
if (mo is not None):
matched = True
# print "Matched <address-expression>"
address = int(mo.group(1), base=0)
breakpoint = target.BreakpointCreateByAddress(address)
if (not matched):
# print "Trying <function-name>"
breakpoint = target.BreakpointCreateByName(linespec)
num_locations = breakpoint.GetNumLocations()
if (num_locations == 0):
result.AppendMessage(
"The line specification provided doesn't resolve to any addresses.")
addr_list = []
for location_index in range(num_locations):
location = breakpoint.GetLocationAtIndex(location_index)
addr_list.append(location.GetAddress())
target.BreakpointDelete(breakpoint.GetID())
return addr_list
def usage_string():
return """ Sets the program counter to a specific address.
Syntax: jump <linespec> [<location-id>]
Command Options Usage:
jump <linenum>
jump +<count>
jump -<count>
jump <filename>:<linenum>
jump <function-name>
jump *<address-expression>
<location-id> serves to disambiguate when multiple locations could be meant."""
def jump(debugger, command, result, internal_dict):
if (command == ""):
result.AppendMessage(usage_string())
args = command.split()
if not debugger.IsValid():
result.AppendMessage("Invalid debugger!")
return
target = debugger.GetSelectedTarget()
if not target.IsValid():
result.AppendMessage("jump requires a valid target.")
return
process = target.GetProcess()
if not process.IsValid():
result.AppendMessage("jump requires a valid process.")
return
thread = process.GetSelectedThread()
if not thread.IsValid():
result.AppendMessage("jump requires a valid thread.")
return
frame = thread.GetSelectedFrame()
if not frame.IsValid():
result.AppendMessage("jump requires a valid frame.")
return
addresses = parse_linespec(args[0], frame, result)
stream = lldb.SBStream()
if len(addresses) == 0:
return
desired_address = addresses[0]
if len(addresses) > 1:
if len(args) == 2:
desired_index = int(args[1])
if (desired_index >= 0) and (desired_index < len(addresses)):
desired_address = addresses[desired_index]
else:
result.AppendMessage(
"Desired index " +
args[1] +
" is not one of the options.")
return
else:
index = 0
result.AppendMessage(
"The specified location resolves to multiple targets.")
for address in addresses:
stream.Clear()
address.GetDescription(stream)
result.AppendMessage(
" Location ID " +
str(index) +
": " +
stream.GetData())
index = index + 1
result.AppendMessage(
"Please type 'jump " +
command +
" <location-id>' to choose one.")
return
frame.SetPC(desired_address.GetLoadAddress(target))
if lldb.debugger:
# Module is being run inside the LLDB interpreter
jump.__doc__ = usage_string()
lldb.debugger.HandleCommand('command script add -f jump.jump jump')
print('The "jump" command has been installed, type "help jump" or "jump <ENTER>" for detailed help.')
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