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# Copyright (c) 2011 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""GDB support for Chrome types.
Add this to your gdb by amending your ~/.gdbinit as follows:
python
import sys
sys.path.insert(0, "/path/to/tools/gdb/")
import gdb_chrome
This module relies on the WebKit gdb module already existing in
your Python path.
"""
import gdb
import webkit
def typed_ptr(ptr):
"""Prints a pointer along with its exact type.
By default, gdb would print just the address, which takes more
steps to interpret.
"""
# Returning this as a cast expression surrounded by parentheses
# makes it easier to cut+paste inside of gdb.
return '((%s)%s)' % (ptr.dynamic_type, ptr)
class String16Printer(webkit.StringPrinter):
def to_string(self):
return webkit.ustring_to_string(self.val['_M_dataplus']['_M_p'])
class GURLPrinter(webkit.StringPrinter):
def to_string(self):
return self.val['spec_']
class FilePathPrinter(object):
def __init__(self, val):
self.val = val
def to_string(self):
return self.val['path_']['_M_dataplus']['_M_p']
class ScopedRefPtrPrinter(object):
def __init__(self, val):
self.val = val
def to_string(self):
return 'scoped_refptr' + typed_ptr(self.val['ptr_'])
class SiteInstanceImplPrinter(object):
def __init__(self, val):
self.val = val.cast(val.dynamic_type)
def to_string(self):
return 'SiteInstanceImpl@%s for %s' % (
self.val.address, self.val['site_'])
def children(self):
yield ('id_', self.val['id_'])
yield ('has_site_', self.val['has_site_'])
if self.val['browsing_instance_']['ptr_']:
yield ('browsing_instance_', self.val['browsing_instance_']['ptr_'])
if self.val['process_']:
yield ('process_', typed_ptr(self.val['process_']))
if self.val['render_process_host_factory_']:
yield ('render_process_host_factory_',
self.val['render_process_host_factory_'])
class RenderProcessHostImplPrinter(object):
def __init__(self, val):
self.val = val.cast(val.dynamic_type)
def to_string(self):
pid = ''
child_process_launcher_ptr = (
self.val['child_process_launcher_']['impl_']['data_']['ptr'])
if child_process_launcher_ptr:
context = (child_process_launcher_ptr.dereference()
['context_']['ptr_'])
if context:
pid = ' PID %s' % str(context.dereference()
['process_']['process_'])
return 'RenderProcessHostImpl@%s%s' % (self.val.address, pid)
def children(self):
yield ('id_', self.val['id_'])
yield ('render_widget_hosts_',
self.val['render_widget_hosts_']['data_'])
yield ('fast_shutdown_started_', self.val['fast_shutdown_started_'])
yield ('deleting_soon_', self.val['deleting_soon_'])
yield ('pending_views_', self.val['pending_views_'])
yield ('visible_widgets_', self.val['visible_widgets_'])
yield ('backgrounded_', self.val['backgrounded_'])
yield ('widget_helper_', self.val['widget_helper_'])
yield ('is_initialized_', self.val['is_initialized_'])
yield ('browser_context_', typed_ptr(self.val['browser_context_']))
yield ('sudden_termination_allowed_',
self.val['sudden_termination_allowed_'])
yield ('ignore_input_events_', self.val['ignore_input_events_'])
yield ('is_guest_', self.val['is_guest_'])
pp_set = gdb.printing.RegexpCollectionPrettyPrinter("chromium")
pp_set.add_printer('FilePath', '^FilePath$', FilePathPrinter)
pp_set.add_printer('GURL', '^GURL$', GURLPrinter)
pp_set.add_printer('content::RenderProcessHostImpl',
'^content::RenderProcessHostImpl$',
RenderProcessHostImplPrinter)
pp_set.add_printer('content::SiteInstanceImpl', '^content::SiteInstanceImpl$',
SiteInstanceImplPrinter)
pp_set.add_printer('scoped_refptr', '^scoped_refptr<.*>$', ScopedRefPtrPrinter)
pp_set.add_printer('string16', '^string16$', String16Printer);
gdb.printing.register_pretty_printer(gdb, pp_set)
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