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# LLDB UI state in the Vim user interface.
from __future__ import print_function
import os
import re
import sys
import lldb
import vim
from vim_panes import *
from vim_signs import *
def is_same_file(a, b):
""" returns true if paths a and b are the same file """
a = os.path.realpath(a)
b = os.path.realpath(b)
return a in b or b in a
class UI:
def __init__(self):
""" Declare UI state variables """
# Default panes to display
self.defaultPanes = [
'breakpoints',
'backtrace',
'locals',
'threads',
'registers',
'disassembly']
# map of tuples (filename, line) --> SBBreakpoint
self.markedBreakpoints = {}
# Currently shown signs
self.breakpointSigns = {}
self.pcSigns = []
# Container for panes
self.paneCol = PaneLayout()
# All possible LLDB panes
self.backtracePane = BacktracePane(self.paneCol)
self.threadPane = ThreadPane(self.paneCol)
self.disassemblyPane = DisassemblyPane(self.paneCol)
self.localsPane = LocalsPane(self.paneCol)
self.registersPane = RegistersPane(self.paneCol)
self.breakPane = BreakpointsPane(self.paneCol)
def activate(self):
""" Activate UI: display default set of panes """
self.paneCol.prepare(self.defaultPanes)
def get_user_buffers(self, filter_name=None):
""" Returns a list of buffers that are not a part of the LLDB UI. That is, they
are not contained in the PaneLayout object self.paneCol.
"""
ret = []
for w in vim.windows:
b = w.buffer
if not self.paneCol.contains(b.name):
if filter_name is None or filter_name in b.name:
ret.append(b)
return ret
def update_pc(self, process, buffers, goto_file):
""" Place the PC sign on the PC location of each thread's selected frame """
def GetPCSourceLocation(thread):
""" Returns a tuple (thread_index, file, line, column) that represents where
the PC sign should be placed for a thread.
"""
frame = thread.GetSelectedFrame()
frame_num = frame.GetFrameID()
le = frame.GetLineEntry()
while not le.IsValid() and frame_num < thread.GetNumFrames():
frame_num += 1
le = thread.GetFrameAtIndex(frame_num).GetLineEntry()
if le.IsValid():
path = os.path.join(
le.GetFileSpec().GetDirectory(),
le.GetFileSpec().GetFilename())
return (
thread.GetIndexID(),
path,
le.GetLine(),
le.GetColumn())
return None
# Clear all existing PC signs
del_list = []
for sign in self.pcSigns:
sign.hide()
del_list.append(sign)
for sign in del_list:
self.pcSigns.remove(sign)
del sign
# Select a user (non-lldb) window
if not self.paneCol.selectWindow(False):
# No user window found; avoid clobbering by splitting
vim.command(":vsp")
# Show a PC marker for each thread
for thread in process:
loc = GetPCSourceLocation(thread)
if not loc:
# no valid source locations for PCs. hide all existing PC
# markers
continue
buf = None
(tid, fname, line, col) = loc
buffers = self.get_user_buffers(fname)
is_selected = thread.GetIndexID() == process.GetSelectedThread().GetIndexID()
if len(buffers) == 1:
buf = buffers[0]
if buf != vim.current.buffer:
# Vim has an open buffer to the required file: select it
vim.command('execute ":%db"' % buf.number)
elif is_selected and vim.current.buffer.name not in fname and os.path.exists(fname) and goto_file:
# FIXME: If current buffer is modified, vim will complain when we try to switch away.
# Find a way to detect if the current buffer is modified,
# and...warn instead?
vim.command('execute ":e %s"' % fname)
buf = vim.current.buffer
elif len(buffers) > 1 and goto_file:
# FIXME: multiple open buffers match PC location
continue
else:
continue
self.pcSigns.append(PCSign(buf, line, is_selected))
if is_selected and goto_file:
# if the selected file has a PC marker, move the cursor there
# too
curname = vim.current.buffer.name
if curname is not None and is_same_file(curname, fname):
move_cursor(line, 0)
elif move_cursor:
print("FIXME: not sure where to move cursor because %s != %s " % (vim.current.buffer.name, fname))
def update_breakpoints(self, target, buffers):
""" Decorates buffer with signs corresponding to breakpoints in target. """
def GetBreakpointLocations(bp):
""" Returns a list of tuples (resolved, filename, line) where a breakpoint was resolved. """
if not bp.IsValid():
sys.stderr.write("breakpoint is invalid, no locations")
return []
ret = []
numLocs = bp.GetNumLocations()
for i in range(numLocs):
loc = bp.GetLocationAtIndex(i)
desc = get_description(loc, lldb.eDescriptionLevelFull)
match = re.search('at\ ([^:]+):([\d]+)', desc)
try:
lineNum = int(match.group(2).strip())
ret.append((loc.IsResolved(), match.group(1), lineNum))
except ValueError as e:
sys.stderr.write(
"unable to parse breakpoint location line number: '%s'" %
match.group(2))
sys.stderr.write(str(e))
return ret
if target is None or not target.IsValid():
return
needed_bps = {}
for bp_index in range(target.GetNumBreakpoints()):
bp = target.GetBreakpointAtIndex(bp_index)
locations = GetBreakpointLocations(bp)
for (is_resolved, file, line) in GetBreakpointLocations(bp):
for buf in buffers:
if file in buf.name:
needed_bps[(buf, line, is_resolved)] = bp
# Hide any signs that correspond with disabled breakpoints
del_list = []
for (b, l, r) in self.breakpointSigns:
if (b, l, r) not in needed_bps:
self.breakpointSigns[(b, l, r)].hide()
del_list.append((b, l, r))
for d in del_list:
del self.breakpointSigns[d]
# Show any signs for new breakpoints
for (b, l, r) in needed_bps:
bp = needed_bps[(b, l, r)]
if self.haveBreakpoint(b.name, l):
self.markedBreakpoints[(b.name, l)].append(bp)
else:
self.markedBreakpoints[(b.name, l)] = [bp]
if (b, l, r) not in self.breakpointSigns:
s = BreakpointSign(b, l, r)
self.breakpointSigns[(b, l, r)] = s
def update(self, target, status, controller, goto_file=False):
""" Updates debugger info panels and breakpoint/pc marks and prints
status to the vim status line. If goto_file is True, the user's
cursor is moved to the source PC location in the selected frame.
"""
self.paneCol.update(target, controller)
self.update_breakpoints(target, self.get_user_buffers())
if target is not None and target.IsValid():
process = target.GetProcess()
if process is not None and process.IsValid():
self.update_pc(process, self.get_user_buffers, goto_file)
if status is not None and len(status) > 0:
print(status)
def haveBreakpoint(self, file, line):
""" Returns True if we have a breakpoint at file:line, False otherwise """
return (file, line) in self.markedBreakpoints
def getBreakpoints(self, fname, line):
""" Returns the LLDB SBBreakpoint object at fname:line """
if self.haveBreakpoint(fname, line):
return self.markedBreakpoints[(fname, line)]
else:
return None
def deleteBreakpoints(self, name, line):
del self.markedBreakpoints[(name, line)]
def showWindow(self, name):
""" Shows (un-hides) window pane specified by name """
if not self.paneCol.havePane(name):
sys.stderr.write("unknown window: %s" % name)
return False
self.paneCol.prepare([name])
return True
def hideWindow(self, name):
""" Hides window pane specified by name """
if not self.paneCol.havePane(name):
sys.stderr.write("unknown window: %s" % name)
return False
self.paneCol.hide([name])
return True
global ui
ui = UI()
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