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# Copyright 2018 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
Creates a SVG graph of the view hierarchy, when stopped in a
method of an object that inherits from views::View. Requires
graphviz.
For more info see
chromium/src/+/HEAD/docs/graphical_debugging_aid_chromium_views.md
To make this command available, add the following to your ~/.lldbinit:
command script import {Path to SRC Root}/tools/lldb/lldb_viewg.py
Usage: type `viewg` at the LLDB prompt, given the conditions above.
"""
import lldb
import os
def view_graph(debugger, command, result, internal_dict):
dot = os.path.expanduser("~/state.dot")
svg = os.path.splitext(dot)[0] + ".svg"
process = debugger.GetSelectedTarget().GetProcess()
frame = process.GetSelectedThread().GetSelectedFrame()
cstr_address = frame.EvaluateExpression("views::PrintViewGraph(this).c_str()")
if not cstr_address.GetError().Success():
return
str_size = frame.EvaluateExpression("(size_t)strlen(%s)"
% cstr_address.GetValue())
if not str_size.GetError().Success():
return
error = lldb.SBError()
dot_str = process.ReadCStringFromMemory(int(cstr_address.GetValue(), 16),
str_size.GetValueAsUnsigned(), error)
if not error.Success():
return
with open(dot, "w") as f:
f.write(dot_str)
os.system("dot -Tsvg -o %s %s" % (svg, dot))
def __lldb_init_module(debugger, internal_dict):
debugger.HandleCommand('command script add -f lldb_viewg.view_graph viewg')
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