xref: /linux/tools/perf/scripts/python/exported-sql-viewer.py (revision f2dde1ed0f2818405b371c2b65a98fece221b7a0)

#!/usr/bin/env python2
# SPDX-License-Identifier: GPL-2.0
# exported-sql-viewer.py: view data from sql database
# Copyright (c) 2014-2018, Intel Corporation.

# To use this script you will need to have exported data using either the
# export-to-sqlite.py or the export-to-postgresql.py script.  Refer to those
# scripts for details.
#
# Following on from the example in the export scripts, a
# call-graph can be displayed for the pt_example database like this:
#
#	python tools/perf/scripts/python/exported-sql-viewer.py pt_example
#
# Note that for PostgreSQL, this script supports connecting to remote databases
# by setting hostname, port, username, password, and dbname e.g.
#
#	python tools/perf/scripts/python/exported-sql-viewer.py "hostname=myhost username=myuser password=mypassword dbname=pt_example"
#
# The result is a GUI window with a tree representing a context-sensitive
# call-graph.  Expanding a couple of levels of the tree and adjusting column
# widths to suit will display something like:
#
#                                         Call Graph: pt_example
# Call Path                          Object      Count   Time(ns)  Time(%)  Branch Count   Branch Count(%)
# v- ls
#     v- 2638:2638
#         v- _start                  ld-2.19.so    1     10074071   100.0         211135            100.0
#           |- unknown               unknown       1        13198     0.1              1              0.0
#           >- _dl_start             ld-2.19.so    1      1400980    13.9          19637              9.3
#           >- _d_linit_internal     ld-2.19.so    1       448152     4.4          11094              5.3
#           v-__libc_start_main@plt  ls            1      8211741    81.5         180397             85.4
#              >- _dl_fixup          ld-2.19.so    1         7607     0.1            108              0.1
#              >- __cxa_atexit       libc-2.19.so  1        11737     0.1             10              0.0
#              >- __libc_csu_init    ls            1        10354     0.1             10              0.0
#              |- _setjmp            libc-2.19.so  1            0     0.0              4              0.0
#              v- main               ls            1      8182043    99.6         180254             99.9
#
# Points to note:
#	The top level is a command name (comm)
#	The next level is a thread (pid:tid)
#	Subsequent levels are functions
#	'Count' is the number of calls
#	'Time' is the elapsed time until the function returns
#	Percentages are relative to the level above
#	'Branch Count' is the total number of branches for that function and all
#       functions that it calls

# There is also a "All branches" report, which displays branches and
# possibly disassembly.  However, presently, the only supported disassembler is
# Intel XED, and additionally the object code must be present in perf build ID
# cache. To use Intel XED, libxed.so must be present. To build and install
# libxed.so:
#            git clone https://github.com/intelxed/mbuild.git mbuild
#            git clone https://github.com/intelxed/xed
#            cd xed
#            ./mfile.py --share
#            sudo ./mfile.py --prefix=/usr/local install
#            sudo ldconfig
#
# Example report:
#
# Time           CPU  Command  PID    TID    Branch Type            In Tx  Branch
# 8107675239590  2    ls       22011  22011  return from interrupt  No     ffffffff86a00a67 native_irq_return_iret ([kernel]) -> 7fab593ea260 _start (ld-2.19.so)
#                                                                              7fab593ea260 48 89 e7                                        mov %rsp, %rdi
# 8107675239899  2    ls       22011  22011  hardware interrupt     No         7fab593ea260 _start (ld-2.19.so) -> ffffffff86a012e0 page_fault ([kernel])
# 8107675241900  2    ls       22011  22011  return from interrupt  No     ffffffff86a00a67 native_irq_return_iret ([kernel]) -> 7fab593ea260 _start (ld-2.19.so)
#                                                                              7fab593ea260 48 89 e7                                        mov %rsp, %rdi
#                                                                              7fab593ea263 e8 c8 06 00 00                                  callq  0x7fab593ea930
# 8107675241900  2    ls       22011  22011  call                   No         7fab593ea263 _start+0x3 (ld-2.19.so) -> 7fab593ea930 _dl_start (ld-2.19.so)
#                                                                              7fab593ea930 55                                              pushq  %rbp
#                                                                              7fab593ea931 48 89 e5                                        mov %rsp, %rbp
#                                                                              7fab593ea934 41 57                                           pushq  %r15
#                                                                              7fab593ea936 41 56                                           pushq  %r14
#                                                                              7fab593ea938 41 55                                           pushq  %r13
#                                                                              7fab593ea93a 41 54                                           pushq  %r12
#                                                                              7fab593ea93c 53                                              pushq  %rbx
#                                                                              7fab593ea93d 48 89 fb                                        mov %rdi, %rbx
#                                                                              7fab593ea940 48 83 ec 68                                     sub $0x68, %rsp
#                                                                              7fab593ea944 0f 31                                           rdtsc
#                                                                              7fab593ea946 48 c1 e2 20                                     shl $0x20, %rdx
#                                                                              7fab593ea94a 89 c0                                           mov %eax, %eax
#                                                                              7fab593ea94c 48 09 c2                                        or %rax, %rdx
#                                                                              7fab593ea94f 48 8b 05 1a 15 22 00                            movq  0x22151a(%rip), %rax
# 8107675242232  2    ls       22011  22011  hardware interrupt     No         7fab593ea94f _dl_start+0x1f (ld-2.19.so) -> ffffffff86a012e0 page_fault ([kernel])
# 8107675242900  2    ls       22011  22011  return from interrupt  No     ffffffff86a00a67 native_irq_return_iret ([kernel]) -> 7fab593ea94f _dl_start+0x1f (ld-2.19.so)
#                                                                              7fab593ea94f 48 8b 05 1a 15 22 00                            movq  0x22151a(%rip), %rax
#                                                                              7fab593ea956 48 89 15 3b 13 22 00                            movq  %rdx, 0x22133b(%rip)
# 8107675243232  2    ls       22011  22011  hardware interrupt     No         7fab593ea956 _dl_start+0x26 (ld-2.19.so) -> ffffffff86a012e0 page_fault ([kernel])

from __future__ import print_function

import sys
import weakref
import threading
import string
try:
	# Python2
	import cPickle as pickle
	# size of pickled integer big enough for record size
	glb_nsz = 8
except ImportError:
	import pickle
	glb_nsz = 16
import re
import os
from PySide.QtCore import *
from PySide.QtGui import *
from PySide.QtSql import *
from decimal import *
from ctypes import *
from multiprocessing import Process, Array, Value, Event

# xrange is range in Python3
try:
	xrange
except NameError:
	xrange = range

def printerr(*args, **keyword_args):
	print(*args, file=sys.stderr, **keyword_args)

# Data formatting helpers

def tohex(ip):
	if ip < 0:
		ip += 1 << 64
	return "%x" % ip

def offstr(offset):
	if offset:
		return "+0x%x" % offset
	return ""

def dsoname(name):
	if name == "[kernel.kallsyms]":
		return "[kernel]"
	return name

def findnth(s, sub, n, offs=0):
	pos = s.find(sub)
	if pos < 0:
		return pos
	if n <= 1:
		return offs + pos
	return findnth(s[pos + 1:], sub, n - 1, offs + pos + 1)

# Percent to one decimal place

def PercentToOneDP(n, d):
	if not d:
		return "0.0"
	x = (n * Decimal(100)) / d
	return str(x.quantize(Decimal(".1"), rounding=ROUND_HALF_UP))

# Helper for queries that must not fail

def QueryExec(query, stmt):
	ret = query.exec_(stmt)
	if not ret:
		raise Exception("Query failed: " + query.lastError().text())

# Background thread

class Thread(QThread):

	done = Signal(object)

	def __init__(self, task, param=None, parent=None):
		super(Thread, self).__init__(parent)
		self.task = task
		self.param = param

	def run(self):
		while True:
			if self.param is None:
				done, result = self.task()
			else:
				done, result = self.task(self.param)
			self.done.emit(result)
			if done:
				break

# Tree data model

class TreeModel(QAbstractItemModel):

	def __init__(self, glb, parent=None):
		super(TreeModel, self).__init__(parent)
		self.glb = glb
		self.root = self.GetRoot()
		self.last_row_read = 0

	def Item(self, parent):
		if parent.isValid():
			return parent.internalPointer()
		else:
			return self.root

	def rowCount(self, parent):
		result = self.Item(parent).childCount()
		if result < 0:
			result = 0
			self.dataChanged.emit(parent, parent)
		return result

	def hasChildren(self, parent):
		return self.Item(parent).hasChildren()

	def headerData(self, section, orientation, role):
		if role == Qt.TextAlignmentRole:
			return self.columnAlignment(section)
		if role != Qt.DisplayRole:
			return None
		if orientation != Qt.Horizontal:
			return None
		return self.columnHeader(section)

	def parent(self, child):
		child_item = child.internalPointer()
		if child_item is self.root:
			return QModelIndex()
		parent_item = child_item.getParentItem()
		return self.createIndex(parent_item.getRow(), 0, parent_item)

	def index(self, row, column, parent):
		child_item = self.Item(parent).getChildItem(row)
		return self.createIndex(row, column, child_item)

	def DisplayData(self, item, index):
		return item.getData(index.column())

	def FetchIfNeeded(self, row):
		if row > self.last_row_read:
			self.last_row_read = row
			if row + 10 >= self.root.child_count:
				self.fetcher.Fetch(glb_chunk_sz)

	def columnAlignment(self, column):
		return Qt.AlignLeft

	def columnFont(self, column):
		return None

	def data(self, index, role):
		if role == Qt.TextAlignmentRole:
			return self.columnAlignment(index.column())
		if role == Qt.FontRole:
			return self.columnFont(index.column())
		if role != Qt.DisplayRole:
			return None
		item = index.internalPointer()
		return self.DisplayData(item, index)

# Table data model

class TableModel(QAbstractTableModel):

	def __init__(self, parent=None):
		super(TableModel, self).__init__(parent)
		self.child_count = 0
		self.child_items = []
		self.last_row_read = 0

	def Item(self, parent):
		if parent.isValid():
			return parent.internalPointer()
		else:
			return self

	def rowCount(self, parent):
		return self.child_count

	def headerData(self, section, orientation, role):
		if role == Qt.TextAlignmentRole:
			return self.columnAlignment(section)
		if role != Qt.DisplayRole:
			return None
		if orientation != Qt.Horizontal:
			return None
		return self.columnHeader(section)

	def index(self, row, column, parent):
		return self.createIndex(row, column, self.child_items[row])

	def DisplayData(self, item, index):
		return item.getData(index.column())

	def FetchIfNeeded(self, row):
		if row > self.last_row_read:
			self.last_row_read = row
			if row + 10 >= self.child_count:
				self.fetcher.Fetch(glb_chunk_sz)

	def columnAlignment(self, column):
		return Qt.AlignLeft

	def columnFont(self, column):
		return None

	def data(self, index, role):
		if role == Qt.TextAlignmentRole:
			return self.columnAlignment(index.column())
		if role == Qt.FontRole:
			return self.columnFont(index.column())
		if role != Qt.DisplayRole:
			return None
		item = index.internalPointer()
		return self.DisplayData(item, index)

# Model cache

model_cache = weakref.WeakValueDictionary()
model_cache_lock = threading.Lock()

def LookupCreateModel(model_name, create_fn):
	model_cache_lock.acquire()
	try:
		model = model_cache[model_name]
	except:
		model = None
	if model is None:
		model = create_fn()
		model_cache[model_name] = model
	model_cache_lock.release()
	return model

# Find bar

class FindBar():

	def __init__(self, parent, finder, is_reg_expr=False):
		self.finder = finder
		self.context = []
		self.last_value = None
		self.last_pattern = None

		label = QLabel("Find:")
		label.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

		self.textbox = QComboBox()
		self.textbox.setEditable(True)
		self.textbox.currentIndexChanged.connect(self.ValueChanged)

		self.progress = QProgressBar()
		self.progress.setRange(0, 0)
		self.progress.hide()

		if is_reg_expr:
			self.pattern = QCheckBox("Regular Expression")
		else:
			self.pattern = QCheckBox("Pattern")
		self.pattern.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

		self.next_button = QToolButton()
		self.next_button.setIcon(parent.style().standardIcon(QStyle.SP_ArrowDown))
		self.next_button.released.connect(lambda: self.NextPrev(1))

		self.prev_button = QToolButton()
		self.prev_button.setIcon(parent.style().standardIcon(QStyle.SP_ArrowUp))
		self.prev_button.released.connect(lambda: self.NextPrev(-1))

		self.close_button = QToolButton()
		self.close_button.setIcon(parent.style().standardIcon(QStyle.SP_DockWidgetCloseButton))
		self.close_button.released.connect(self.Deactivate)

		self.hbox = QHBoxLayout()
		self.hbox.setContentsMargins(0, 0, 0, 0)

		self.hbox.addWidget(label)
		self.hbox.addWidget(self.textbox)
		self.hbox.addWidget(self.progress)
		self.hbox.addWidget(self.pattern)
		self.hbox.addWidget(self.next_button)
		self.hbox.addWidget(self.prev_button)
		self.hbox.addWidget(self.close_button)

		self.bar = QWidget()
		self.bar.setLayout(self.hbox);
		self.bar.hide()

	def Widget(self):
		return self.bar

	def Activate(self):
		self.bar.show()
		self.textbox.setFocus()

	def Deactivate(self):
		self.bar.hide()

	def Busy(self):
		self.textbox.setEnabled(False)
		self.pattern.hide()
		self.next_button.hide()
		self.prev_button.hide()
		self.progress.show()

	def Idle(self):
		self.textbox.setEnabled(True)
		self.progress.hide()
		self.pattern.show()
		self.next_button.show()
		self.prev_button.show()

	def Find(self, direction):
		value = self.textbox.currentText()
		pattern = self.pattern.isChecked()
		self.last_value = value
		self.last_pattern = pattern
		self.finder.Find(value, direction, pattern, self.context)

	def ValueChanged(self):
		value = self.textbox.currentText()
		pattern = self.pattern.isChecked()
		index = self.textbox.currentIndex()
		data = self.textbox.itemData(index)
		# Store the pattern in the combo box to keep it with the text value
		if data == None:
			self.textbox.setItemData(index, pattern)
		else:
			self.pattern.setChecked(data)
		self.Find(0)

	def NextPrev(self, direction):
		value = self.textbox.currentText()
		pattern = self.pattern.isChecked()
		if value != self.last_value:
			index = self.textbox.findText(value)
			# Allow for a button press before the value has been added to the combo box
			if index < 0:
				index = self.textbox.count()
				self.textbox.addItem(value, pattern)
				self.textbox.setCurrentIndex(index)
				return
			else:
				self.textbox.setItemData(index, pattern)
		elif pattern != self.last_pattern:
			# Keep the pattern recorded in the combo box up to date
			index = self.textbox.currentIndex()
			self.textbox.setItemData(index, pattern)
		self.Find(direction)

	def NotFound(self):
		QMessageBox.information(self.bar, "Find", "'" + self.textbox.currentText() + "' not found")

# Context-sensitive call graph data model item base

class CallGraphLevelItemBase(object):

	def __init__(self, glb, row, parent_item):
		self.glb = glb
		self.row = row
		self.parent_item = parent_item
		self.query_done = False;
		self.child_count = 0
		self.child_items = []

	def getChildItem(self, row):
		return self.child_items[row]

	def getParentItem(self):
		return self.parent_item

	def getRow(self):
		return self.row

	def childCount(self):
		if not self.query_done:
			self.Select()
			if not self.child_count:
				return -1
		return self.child_count

	def hasChildren(self):
		if not self.query_done:
			return True
		return self.child_count > 0

	def getData(self, column):
		return self.data[column]

# Context-sensitive call graph data model level 2+ item base

class CallGraphLevelTwoPlusItemBase(CallGraphLevelItemBase):

	def __init__(self, glb, row, comm_id, thread_id, call_path_id, time, branch_count, parent_item):
		super(CallGraphLevelTwoPlusItemBase, self).__init__(glb, row, parent_item)
		self.comm_id = comm_id
		self.thread_id = thread_id
		self.call_path_id = call_path_id
		self.branch_count = branch_count
		self.time = time

	def Select(self):
		self.query_done = True;
		query = QSqlQuery(self.glb.db)
		QueryExec(query, "SELECT call_path_id, name, short_name, COUNT(calls.id), SUM(return_time - call_time), SUM(branch_count)"
					" FROM calls"
					" INNER JOIN call_paths ON calls.call_path_id = call_paths.id"
					" INNER JOIN symbols ON call_paths.symbol_id = symbols.id"
					" INNER JOIN dsos ON symbols.dso_id = dsos.id"
					" WHERE parent_call_path_id = " + str(self.call_path_id) +
					" AND comm_id = " + str(self.comm_id) +
					" AND thread_id = " + str(self.thread_id) +
					" GROUP BY call_path_id, name, short_name"
					" ORDER BY call_path_id")
		while query.next():
			child_item = CallGraphLevelThreeItem(self.glb, self.child_count, self.comm_id, self.thread_id, query.value(0), query.value(1), query.value(2), query.value(3), int(query.value(4)), int(query.value(5)), self)
			self.child_items.append(child_item)
			self.child_count += 1

# Context-sensitive call graph data model level three item

class CallGraphLevelThreeItem(CallGraphLevelTwoPlusItemBase):

	def __init__(self, glb, row, comm_id, thread_id, call_path_id, name, dso, count, time, branch_count, parent_item):
		super(CallGraphLevelThreeItem, self).__init__(glb, row, comm_id, thread_id, call_path_id, time, branch_count, parent_item)
		dso = dsoname(dso)
		self.data = [ name, dso, str(count), str(time), PercentToOneDP(time, parent_item.time), str(branch_count), PercentToOneDP(branch_count, parent_item.branch_count) ]
		self.dbid = call_path_id

# Context-sensitive call graph data model level two item

class CallGraphLevelTwoItem(CallGraphLevelTwoPlusItemBase):

	def __init__(self, glb, row, comm_id, thread_id, pid, tid, parent_item):
		super(CallGraphLevelTwoItem, self).__init__(glb, row, comm_id, thread_id, 1, 0, 0, parent_item)
		self.data = [str(pid) + ":" + str(tid), "", "", "", "", "", ""]
		self.dbid = thread_id

	def Select(self):
		super(CallGraphLevelTwoItem, self).Select()
		for child_item in self.child_items:
			self.time += child_item.time
			self.branch_count += child_item.branch_count
		for child_item in self.child_items:
			child_item.data[4] = PercentToOneDP(child_item.time, self.time)
			child_item.data[6] = PercentToOneDP(child_item.branch_count, self.branch_count)

# Context-sensitive call graph data model level one item

class CallGraphLevelOneItem(CallGraphLevelItemBase):

	def __init__(self, glb, row, comm_id, comm, parent_item):
		super(CallGraphLevelOneItem, self).__init__(glb, row, parent_item)
		self.data = [comm, "", "", "", "", "", ""]
		self.dbid = comm_id

	def Select(self):
		self.query_done = True;
		query = QSqlQuery(self.glb.db)
		QueryExec(query, "SELECT thread_id, pid, tid"
					" FROM comm_threads"
					" INNER JOIN threads ON thread_id = threads.id"
					" WHERE comm_id = " + str(self.dbid))
		while query.next():
			child_item = CallGraphLevelTwoItem(self.glb, self.child_count, self.dbid, query.value(0), query.value(1), query.value(2), self)
			self.child_items.append(child_item)
			self.child_count += 1

# Context-sensitive call graph data model root item

class CallGraphRootItem(CallGraphLevelItemBase):

	def __init__(self, glb):
		super(CallGraphRootItem, self).__init__(glb, 0, None)
		self.dbid = 0
		self.query_done = True;
		query = QSqlQuery(glb.db)
		QueryExec(query, "SELECT id, comm FROM comms")
		while query.next():
			if not query.value(0):
				continue
			child_item = CallGraphLevelOneItem(glb, self.child_count, query.value(0), query.value(1), self)
			self.child_items.append(child_item)
			self.child_count += 1

# Context-sensitive call graph data model base

class CallGraphModelBase(TreeModel):

	def __init__(self, glb, parent=None):
		super(CallGraphModelBase, self).__init__(glb, parent)

	def FindSelect(self, value, pattern, query):
		if pattern:
			# postgresql and sqlite pattern patching differences:
			#   postgresql LIKE is case sensitive but sqlite LIKE is not
			#   postgresql LIKE allows % and _ to be escaped with \ but sqlite LIKE does not
			#   postgresql supports ILIKE which is case insensitive
			#   sqlite supports GLOB (text only) which uses * and ? and is case sensitive
			if not self.glb.dbref.is_sqlite3:
				# Escape % and _
				s = value.replace("%", "\%")
				s = s.replace("_", "\_")
				# Translate * and ? into SQL LIKE pattern characters % and _
				trans = string.maketrans("*?", "%_")
				match = " LIKE '" + str(s).translate(trans) + "'"
			else:
				match = " GLOB '" + str(value) + "'"
		else:
			match = " = '" + str(value) + "'"
		self.DoFindSelect(query, match)

	def Found(self, query, found):
		if found:
			return self.FindPath(query)
		return []

	def FindValue(self, value, pattern, query, last_value, last_pattern):
		if last_value == value and pattern == last_pattern:
			found = query.first()
		else:
			self.FindSelect(value, pattern, query)
			found = query.next()
		return self.Found(query, found)

	def FindNext(self, query):
		found = query.next()
		if not found:
			found = query.first()
		return self.Found(query, found)

	def FindPrev(self, query):
		found = query.previous()
		if not found:
			found = query.last()
		return self.Found(query, found)

	def FindThread(self, c):
		if c.direction == 0 or c.value != c.last_value or c.pattern != c.last_pattern:
			ids = self.FindValue(c.value, c.pattern, c.query, c.last_value, c.last_pattern)
		elif c.direction > 0:
			ids = self.FindNext(c.query)
		else:
			ids = self.FindPrev(c.query)
		return (True, ids)

	def Find(self, value, direction, pattern, context, callback):
		class Context():
			def __init__(self, *x):
				self.value, self.direction, self.pattern, self.query, self.last_value, self.last_pattern = x
			def Update(self, *x):
				self.value, self.direction, self.pattern, self.last_value, self.last_pattern = x + (self.value, self.pattern)
		if len(context):
			context[0].Update(value, direction, pattern)
		else:
			context.append(Context(value, direction, pattern, QSqlQuery(self.glb.db), None, None))
		# Use a thread so the UI is not blocked during the SELECT
		thread = Thread(self.FindThread, context[0])
		thread.done.connect(lambda ids, t=thread, c=callback: self.FindDone(t, c, ids), Qt.QueuedConnection)
		thread.start()

	def FindDone(self, thread, callback, ids):
		callback(ids)

# Context-sensitive call graph data model

class CallGraphModel(CallGraphModelBase):

	def __init__(self, glb, parent=None):
		super(CallGraphModel, self).__init__(glb, parent)

	def GetRoot(self):
		return CallGraphRootItem(self.glb)

	def columnCount(self, parent=None):
		return 7

	def columnHeader(self, column):
		headers = ["Call Path", "Object", "Count ", "Time (ns) ", "Time (%) ", "Branch Count ", "Branch Count (%) "]
		return headers[column]

	def columnAlignment(self, column):
		alignment = [ Qt.AlignLeft, Qt.AlignLeft, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight ]
		return alignment[column]

	def DoFindSelect(self, query, match):
		QueryExec(query, "SELECT call_path_id, comm_id, thread_id"
						" FROM calls"
						" INNER JOIN call_paths ON calls.call_path_id = call_paths.id"
						" INNER JOIN symbols ON call_paths.symbol_id = symbols.id"
						" WHERE symbols.name" + match +
						" GROUP BY comm_id, thread_id, call_path_id"
						" ORDER BY comm_id, thread_id, call_path_id")

	def FindPath(self, query):
		# Turn the query result into a list of ids that the tree view can walk
		# to open the tree at the right place.
		ids = []
		parent_id = query.value(0)
		while parent_id:
			ids.insert(0, parent_id)
			q2 = QSqlQuery(self.glb.db)
			QueryExec(q2, "SELECT parent_id"
					" FROM call_paths"
					" WHERE id = " + str(parent_id))
			if not q2.next():
				break
			parent_id = q2.value(0)
		# The call path root is not used
		if ids[0] == 1:
			del ids[0]
		ids.insert(0, query.value(2))
		ids.insert(0, query.value(1))
		return ids

# Call tree data model level 2+ item base

class CallTreeLevelTwoPlusItemBase(CallGraphLevelItemBase):

	def __init__(self, glb, row, comm_id, thread_id, calls_id, time, branch_count, parent_item):
		super(CallTreeLevelTwoPlusItemBase, self).__init__(glb, row, parent_item)
		self.comm_id = comm_id
		self.thread_id = thread_id
		self.calls_id = calls_id
		self.branch_count = branch_count
		self.time = time

	def Select(self):
		self.query_done = True;
		if self.calls_id == 0:
			comm_thread = " AND comm_id = " + str(self.comm_id) + " AND thread_id = " + str(self.thread_id)
		else:
			comm_thread = ""
		query = QSqlQuery(self.glb.db)
		QueryExec(query, "SELECT calls.id, name, short_name, call_time, return_time - call_time, branch_count"
					" FROM calls"
					" INNER JOIN call_paths ON calls.call_path_id = call_paths.id"
					" INNER JOIN symbols ON call_paths.symbol_id = symbols.id"
					" INNER JOIN dsos ON symbols.dso_id = dsos.id"
					" WHERE calls.parent_id = " + str(self.calls_id) + comm_thread +
					" ORDER BY call_time, calls.id")
		while query.next():
			child_item = CallTreeLevelThreeItem(self.glb, self.child_count, self.comm_id, self.thread_id, query.value(0), query.value(1), query.value(2), query.value(3), int(query.value(4)), int(query.value(5)), self)
			self.child_items.append(child_item)
			self.child_count += 1

# Call tree data model level three item

class CallTreeLevelThreeItem(CallTreeLevelTwoPlusItemBase):

	def __init__(self, glb, row, comm_id, thread_id, calls_id, name, dso, count, time, branch_count, parent_item):
		super(CallTreeLevelThreeItem, self).__init__(glb, row, comm_id, thread_id, calls_id, time, branch_count, parent_item)
		dso = dsoname(dso)
		self.data = [ name, dso, str(count), str(time), PercentToOneDP(time, parent_item.time), str(branch_count), PercentToOneDP(branch_count, parent_item.branch_count) ]
		self.dbid = calls_id

# Call tree data model level two item

class CallTreeLevelTwoItem(CallTreeLevelTwoPlusItemBase):

	def __init__(self, glb, row, comm_id, thread_id, pid, tid, parent_item):
		super(CallTreeLevelTwoItem, self).__init__(glb, row, comm_id, thread_id, 0, 0, 0, parent_item)
		self.data = [str(pid) + ":" + str(tid), "", "", "", "", "", ""]
		self.dbid = thread_id

	def Select(self):
		super(CallTreeLevelTwoItem, self).Select()
		for child_item in self.child_items:
			self.time += child_item.time
			self.branch_count += child_item.branch_count
		for child_item in self.child_items:
			child_item.data[4] = PercentToOneDP(child_item.time, self.time)
			child_item.data[6] = PercentToOneDP(child_item.branch_count, self.branch_count)

# Call tree data model level one item

class CallTreeLevelOneItem(CallGraphLevelItemBase):

	def __init__(self, glb, row, comm_id, comm, parent_item):
		super(CallTreeLevelOneItem, self).__init__(glb, row, parent_item)
		self.data = [comm, "", "", "", "", "", ""]
		self.dbid = comm_id

	def Select(self):
		self.query_done = True;
		query = QSqlQuery(self.glb.db)
		QueryExec(query, "SELECT thread_id, pid, tid"
					" FROM comm_threads"
					" INNER JOIN threads ON thread_id = threads.id"
					" WHERE comm_id = " + str(self.dbid))
		while query.next():
			child_item = CallTreeLevelTwoItem(self.glb, self.child_count, self.dbid, query.value(0), query.value(1), query.value(2), self)
			self.child_items.append(child_item)
			self.child_count += 1

# Call tree data model root item

class CallTreeRootItem(CallGraphLevelItemBase):

	def __init__(self, glb):
		super(CallTreeRootItem, self).__init__(glb, 0, None)
		self.dbid = 0
		self.query_done = True;
		query = QSqlQuery(glb.db)
		QueryExec(query, "SELECT id, comm FROM comms")
		while query.next():
			if not query.value(0):
				continue
			child_item = CallTreeLevelOneItem(glb, self.child_count, query.value(0), query.value(1), self)
			self.child_items.append(child_item)
			self.child_count += 1

# Call Tree data model

class CallTreeModel(CallGraphModelBase):

	def __init__(self, glb, parent=None):
		super(CallTreeModel, self).__init__(glb, parent)

	def GetRoot(self):
		return CallTreeRootItem(self.glb)

	def columnCount(self, parent=None):
		return 7

	def columnHeader(self, column):
		headers = ["Call Path", "Object", "Call Time", "Time (ns) ", "Time (%) ", "Branch Count ", "Branch Count (%) "]
		return headers[column]

	def columnAlignment(self, column):
		alignment = [ Qt.AlignLeft, Qt.AlignLeft, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight ]
		return alignment[column]

	def DoFindSelect(self, query, match):
		QueryExec(query, "SELECT calls.id, comm_id, thread_id"
						" FROM calls"
						" INNER JOIN call_paths ON calls.call_path_id = call_paths.id"
						" INNER JOIN symbols ON call_paths.symbol_id = symbols.id"
						" WHERE symbols.name" + match +
						" ORDER BY comm_id, thread_id, call_time, calls.id")

	def FindPath(self, query):
		# Turn the query result into a list of ids that the tree view can walk
		# to open the tree at the right place.
		ids = []
		parent_id = query.value(0)
		while parent_id:
			ids.insert(0, parent_id)
			q2 = QSqlQuery(self.glb.db)
			QueryExec(q2, "SELECT parent_id"
					" FROM calls"
					" WHERE id = " + str(parent_id))
			if not q2.next():
				break
			parent_id = q2.value(0)
		ids.insert(0, query.value(2))
		ids.insert(0, query.value(1))
		return ids

# Vertical widget layout

class VBox():

	def __init__(self, w1, w2, w3=None):
		self.vbox = QWidget()
		self.vbox.setLayout(QVBoxLayout());

		self.vbox.layout().setContentsMargins(0, 0, 0, 0)

		self.vbox.layout().addWidget(w1)
		self.vbox.layout().addWidget(w2)
		if w3:
			self.vbox.layout().addWidget(w3)

	def Widget(self):
		return self.vbox

# Tree window base

class TreeWindowBase(QMdiSubWindow):

	def __init__(self, parent=None):
		super(TreeWindowBase, self).__init__(parent)

		self.model = None
		self.view = None
		self.find_bar = None

	def DisplayFound(self, ids):
		if not len(ids):
			return False
		parent = QModelIndex()
		for dbid in ids:
			found = False
			n = self.model.rowCount(parent)
			for row in xrange(n):
				child = self.model.index(row, 0, parent)
				if child.internalPointer().dbid == dbid:
					found = True
					self.view.setCurrentIndex(child)
					parent = child
					break
			if not found:
				break
		return found

	def Find(self, value, direction, pattern, context):
		self.view.setFocus()
		self.find_bar.Busy()
		self.model.Find(value, direction, pattern, context, self.FindDone)

	def FindDone(self, ids):
		found = True
		if not self.DisplayFound(ids):
			found = False
		self.find_bar.Idle()
		if not found:
			self.find_bar.NotFound()


# Context-sensitive call graph window

class CallGraphWindow(TreeWindowBase):

	def __init__(self, glb, parent=None):
		super(CallGraphWindow, self).__init__(parent)

		self.model = LookupCreateModel("Context-Sensitive Call Graph", lambda x=glb: CallGraphModel(x))

		self.view = QTreeView()
		self.view.setModel(self.model)

		for c, w in ((0, 250), (1, 100), (2, 60), (3, 70), (4, 70), (5, 100)):
			self.view.setColumnWidth(c, w)

		self.find_bar = FindBar(self, self)

		self.vbox = VBox(self.view, self.find_bar.Widget())

		self.setWidget(self.vbox.Widget())

		AddSubWindow(glb.mainwindow.mdi_area, self, "Context-Sensitive Call Graph")

# Call tree window

class CallTreeWindow(TreeWindowBase):

	def __init__(self, glb, parent=None):
		super(CallTreeWindow, self).__init__(parent)

		self.model = LookupCreateModel("Call Tree", lambda x=glb: CallTreeModel(x))

		self.view = QTreeView()
		self.view.setModel(self.model)

		for c, w in ((0, 230), (1, 100), (2, 100), (3, 70), (4, 70), (5, 100)):
			self.view.setColumnWidth(c, w)

		self.find_bar = FindBar(self, self)

		self.vbox = VBox(self.view, self.find_bar.Widget())

		self.setWidget(self.vbox.Widget())

		AddSubWindow(glb.mainwindow.mdi_area, self, "Call Tree")

# Child data item  finder

class ChildDataItemFinder():

	def __init__(self, root):
		self.root = root
		self.value, self.direction, self.pattern, self.last_value, self.last_pattern = (None,) * 5
		self.rows = []
		self.pos = 0

	def FindSelect(self):
		self.rows = []
		if self.pattern:
			pattern = re.compile(self.value)
			for child in self.root.child_items:
				for column_data in child.data:
					if re.search(pattern, str(column_data)) is not None:
						self.rows.append(child.row)
						break
		else:
			for child in self.root.child_items:
				for column_data in child.data:
					if self.value in str(column_data):
						self.rows.append(child.row)
						break

	def FindValue(self):
		self.pos = 0
		if self.last_value != self.value or self.pattern != self.last_pattern:
			self.FindSelect()
		if not len(self.rows):
			return -1
		return self.rows[self.pos]

	def FindThread(self):
		if self.direction == 0 or self.value != self.last_value or self.pattern != self.last_pattern:
			row = self.FindValue()
		elif len(self.rows):
			if self.direction > 0:
				self.pos += 1
				if self.pos >= len(self.rows):
					self.pos = 0
			else:
				self.pos -= 1
				if self.pos < 0:
					self.pos = len(self.rows) - 1
			row = self.rows[self.pos]
		else:
			row = -1
		return (True, row)

	def Find(self, value, direction, pattern, context, callback):
		self.value, self.direction, self.pattern, self.last_value, self.last_pattern = (value, direction,pattern, self.value, self.pattern)
		# Use a thread so the UI is not blocked
		thread = Thread(self.FindThread)
		thread.done.connect(lambda row, t=thread, c=callback: self.FindDone(t, c, row), Qt.QueuedConnection)
		thread.start()

	def FindDone(self, thread, callback, row):
		callback(row)

# Number of database records to fetch in one go

glb_chunk_sz = 10000

# Background process for SQL data fetcher

class SQLFetcherProcess():

	def __init__(self, dbref, sql, buffer, head, tail, fetch_count, fetching_done, process_target, wait_event, fetched_event, prep):
		# Need a unique connection name
		conn_name = "SQLFetcher" + str(os.getpid())
		self.db, dbname = dbref.Open(conn_name)
		self.sql = sql
		self.buffer = buffer
		self.head = head
		self.tail = tail
		self.fetch_count = fetch_count
		self.fetching_done = fetching_done
		self.process_target = process_target
		self.wait_event = wait_event
		self.fetched_event = fetched_event
		self.prep = prep
		self.query = QSqlQuery(self.db)
		self.query_limit = 0 if "$$last_id$$" in sql else 2
		self.last_id = -1
		self.fetched = 0
		self.more = True
		self.local_head = self.head.value
		self.local_tail = self.tail.value

	def Select(self):
		if self.query_limit:
			if self.query_limit == 1:
				return
			self.query_limit -= 1
		stmt = self.sql.replace("$$last_id$$", str(self.last_id))
		QueryExec(self.query, stmt)

	def Next(self):
		if not self.query.next():
			self.Select()
			if not self.query.next():
				return None
		self.last_id = self.query.value(0)
		return self.prep(self.query)

	def WaitForTarget(self):
		while True:
			self.wait_event.clear()
			target = self.process_target.value
			if target > self.fetched or target < 0:
				break
			self.wait_event.wait()
		return target

	def HasSpace(self, sz):
		if self.local_tail <= self.local_head:
			space = len(self.buffer) - self.local_head
			if space > sz:
				return True
			if space >= glb_nsz:
				# Use 0 (or space < glb_nsz) to mean there is no more at the top of the buffer
				nd = pickle.dumps(0, pickle.HIGHEST_PROTOCOL)
				self.buffer[self.local_head : self.local_head + len(nd)] = nd
			self.local_head = 0
		if self.local_tail - self.local_head > sz:
			return True
		return False

	def WaitForSpace(self, sz):
		if self.HasSpace(sz):
			return
		while True:
			self.wait_event.clear()
			self.local_tail = self.tail.value
			if self.HasSpace(sz):
				return
			self.wait_event.wait()

	def AddToBuffer(self, obj):
		d = pickle.dumps(obj, pickle.HIGHEST_PROTOCOL)
		n = len(d)
		nd = pickle.dumps(n, pickle.HIGHEST_PROTOCOL)
		sz = n + glb_nsz
		self.WaitForSpace(sz)
		pos = self.local_head
		self.buffer[pos : pos + len(nd)] = nd
		self.buffer[pos + glb_nsz : pos + sz] = d
		self.local_head += sz

	def FetchBatch(self, batch_size):
		fetched = 0
		while batch_size > fetched:
			obj = self.Next()
			if obj is None:
				self.more = False
				break
			self.AddToBuffer(obj)
			fetched += 1
		if fetched:
			self.fetched += fetched
			with self.fetch_count.get_lock():
				self.fetch_count.value += fetched
			self.head.value = self.local_head
			self.fetched_event.set()

	def Run(self):
		while self.more:
			target = self.WaitForTarget()
			if target < 0:
				break
			batch_size = min(glb_chunk_sz, target - self.fetched)
			self.FetchBatch(batch_size)
		self.fetching_done.value = True
		self.fetched_event.set()

def SQLFetcherFn(*x):
	process = SQLFetcherProcess(*x)
	process.Run()

# SQL data fetcher

class SQLFetcher(QObject):

	done = Signal(object)

	def __init__(self, glb, sql, prep, process_data, parent=None):
		super(SQLFetcher, self).__init__(parent)
		self.process_data = process_data
		self.more = True
		self.target = 0
		self.last_target = 0
		self.fetched = 0
		self.buffer_size = 16 * 1024 * 1024
		self.buffer = Array(c_char, self.buffer_size, lock=False)
		self.head = Value(c_longlong)
		self.tail = Value(c_longlong)
		self.local_tail = 0
		self.fetch_count = Value(c_longlong)
		self.fetching_done = Value(c_bool)
		self.last_count = 0
		self.process_target = Value(c_longlong)
		self.wait_event = Event()
		self.fetched_event = Event()
		glb.AddInstanceToShutdownOnExit(self)
		self.process = Process(target=SQLFetcherFn, args=(glb.dbref, sql, self.buffer, self.head, self.tail, self.fetch_count, self.fetching_done, self.process_target, self.wait_event, self.fetched_event, prep))
		self.process.start()
		self.thread = Thread(self.Thread)
		self.thread.done.connect(self.ProcessData, Qt.QueuedConnection)
		self.thread.start()

	def Shutdown(self):
		# Tell the thread and process to exit
		self.process_target.value = -1
		self.wait_event.set()
		self.more = False
		self.fetching_done.value = True
		self.fetched_event.set()

	def Thread(self):
		if not self.more:
			return True, 0
		while True:
			self.fetched_event.clear()
			fetch_count = self.fetch_count.value
			if fetch_count != self.last_count:
				break
			if self.fetching_done.value:
				self.more = False
				return True, 0
			self.fetched_event.wait()
		count = fetch_count - self.last_count
		self.last_count = fetch_count
		self.fetched += count
		return False, count

	def Fetch(self, nr):
		if not self.more:
			# -1 inidcates there are no more
			return -1
		result = self.fetched
		extra = result + nr - self.target
		if extra > 0:
			self.target += extra
			# process_target < 0 indicates shutting down
			if self.process_target.value >= 0:
				self.process_target.value = self.target
			self.wait_event.set()
		return result

	def RemoveFromBuffer(self):
		pos = self.local_tail
		if len(self.buffer) - pos < glb_nsz:
			pos = 0
		n = pickle.loads(self.buffer[pos : pos + glb_nsz])
		if n == 0:
			pos = 0
			n = pickle.loads(self.buffer[0 : glb_nsz])
		pos += glb_nsz
		obj = pickle.loads(self.buffer[pos : pos + n])
		self.local_tail = pos + n
		return obj

	def ProcessData(self, count):
		for i in xrange(count):
			obj = self.RemoveFromBuffer()
			self.process_data(obj)
		self.tail.value = self.local_tail
		self.wait_event.set()
		self.done.emit(count)

# Fetch more records bar

class FetchMoreRecordsBar():

	def __init__(self, model, parent):
		self.model = model

		self.label = QLabel("Number of records (x " + "{:,}".format(glb_chunk_sz) + ") to fetch:")
		self.label.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

		self.fetch_count = QSpinBox()
		self.fetch_count.setRange(1, 1000000)
		self.fetch_count.setValue(10)
		self.fetch_count.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

		self.fetch = QPushButton("Go!")
		self.fetch.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
		self.fetch.released.connect(self.FetchMoreRecords)

		self.progress = QProgressBar()
		self.progress.setRange(0, 100)
		self.progress.hide()

		self.done_label = QLabel("All records fetched")
		self.done_label.hide()

		self.spacer = QLabel("")

		self.close_button = QToolButton()
		self.close_button.setIcon(parent.style().standardIcon(QStyle.SP_DockWidgetCloseButton))
		self.close_button.released.connect(self.Deactivate)

		self.hbox = QHBoxLayout()
		self.hbox.setContentsMargins(0, 0, 0, 0)

		self.hbox.addWidget(self.label)
		self.hbox.addWidget(self.fetch_count)
		self.hbox.addWidget(self.fetch)
		self.hbox.addWidget(self.spacer)
		self.hbox.addWidget(self.progress)
		self.hbox.addWidget(self.done_label)
		self.hbox.addWidget(self.close_button)

		self.bar = QWidget()
		self.bar.setLayout(self.hbox);
		self.bar.show()

		self.in_progress = False
		self.model.progress.connect(self.Progress)

		self.done = False

		if not model.HasMoreRecords():
			self.Done()

	def Widget(self):
		return self.bar

	def Activate(self):
		self.bar.show()
		self.fetch.setFocus()

	def Deactivate(self):
		self.bar.hide()

	def Enable(self, enable):
		self.fetch.setEnabled(enable)
		self.fetch_count.setEnabled(enable)

	def Busy(self):
		self.Enable(False)
		self.fetch.hide()
		self.spacer.hide()
		self.progress.show()

	def Idle(self):
		self.in_progress = False
		self.Enable(True)
		self.progress.hide()
		self.fetch.show()
		self.spacer.show()

	def Target(self):
		return self.fetch_count.value() * glb_chunk_sz

	def Done(self):
		self.done = True
		self.Idle()
		self.label.hide()
		self.fetch_count.hide()
		self.fetch.hide()
		self.spacer.hide()
		self.done_label.show()

	def Progress(self, count):
		if self.in_progress:
			if count:
				percent = ((count - self.start) * 100) / self.Target()
				if percent >= 100:
					self.Idle()
				else:
					self.progress.setValue(percent)
		if not count:
			# Count value of zero means no more records
			self.Done()

	def FetchMoreRecords(self):
		if self.done:
			return
		self.progress.setValue(0)
		self.Busy()
		self.in_progress = True
		self.start = self.model.FetchMoreRecords(self.Target())

# Brance data model level two item

class BranchLevelTwoItem():

	def __init__(self, row, text, parent_item):
		self.row = row
		self.parent_item = parent_item
		self.data = [""] * 8
		self.data[7] = text
		self.level = 2

	def getParentItem(self):
		return self.parent_item

	def getRow(self):
		return self.row

	def childCount(self):
		return 0

	def hasChildren(self):
		return False

	def getData(self, column):
		return self.data[column]

# Brance data model level one item

class BranchLevelOneItem():

	def __init__(self, glb, row, data, parent_item):
		self.glb = glb
		self.row = row
		self.parent_item = parent_item
		self.child_count = 0
		self.child_items = []
		self.data = data[1:]
		self.dbid = data[0]
		self.level = 1
		self.query_done = False

	def getChildItem(self, row):
		return self.child_items[row]

	def getParentItem(self):
		return self.parent_item

	def getRow(self):
		return self.row

	def Select(self):
		self.query_done = True

		if not self.glb.have_disassembler:
			return

		query = QSqlQuery(self.glb.db)

		QueryExec(query, "SELECT cpu, to_dso_id, to_symbol_id, to_sym_offset, short_name, long_name, build_id, sym_start, to_ip"
				  " FROM samples"
				  " INNER JOIN dsos ON samples.to_dso_id = dsos.id"
				  " INNER JOIN symbols ON samples.to_symbol_id = symbols.id"
				  " WHERE samples.id = " + str(self.dbid))
		if not query.next():
			return
		cpu = query.value(0)
		dso = query.value(1)
		sym = query.value(2)
		if dso == 0 or sym == 0:
			return
		off = query.value(3)
		short_name = query.value(4)
		long_name = query.value(5)
		build_id = query.value(6)
		sym_start = query.value(7)
		ip = query.value(8)

		QueryExec(query, "SELECT samples.dso_id, symbol_id, sym_offset, sym_start"
				  " FROM samples"
				  " INNER JOIN symbols ON samples.symbol_id = symbols.id"
				  " WHERE samples.id > " + str(self.dbid) + " AND cpu = " + str(cpu) +
				  " ORDER BY samples.id"
				  " LIMIT 1")
		if not query.next():
			return
		if query.value(0) != dso:
			# Cannot disassemble from one dso to another
			return
		bsym = query.value(1)
		boff = query.value(2)
		bsym_start = query.value(3)
		if bsym == 0:
			return
		tot = bsym_start + boff + 1 - sym_start - off
		if tot <= 0 or tot > 16384:
			return

		inst = self.glb.disassembler.Instruction()
		f = self.glb.FileFromNamesAndBuildId(short_name, long_name, build_id)
		if not f:
			return
		mode = 0 if Is64Bit(f) else 1
		self.glb.disassembler.SetMode(inst, mode)

		buf_sz = tot + 16
		buf = create_string_buffer(tot + 16)
		f.seek(sym_start + off)
		buf.value = f.read(buf_sz)
		buf_ptr = addressof(buf)
		i = 0
		while tot > 0:
			cnt, text = self.glb.disassembler.DisassembleOne(inst, buf_ptr, buf_sz, ip)
			if cnt:
				byte_str = tohex(ip).rjust(16)
				for k in xrange(cnt):
					byte_str += " %02x" % ord(buf[i])
					i += 1
				while k < 15:
					byte_str += "   "
					k += 1
				self.child_items.append(BranchLevelTwoItem(0, byte_str + " " + text, self))
				self.child_count += 1
			else:
				return
			buf_ptr += cnt
			tot -= cnt
			buf_sz -= cnt
			ip += cnt

	def childCount(self):
		if not self.query_done:
			self.Select()
			if not self.child_count:
				return -1
		return self.child_count

	def hasChildren(self):
		if not self.query_done:
			return True
		return self.child_count > 0

	def getData(self, column):
		return self.data[column]

# Brance data model root item

class BranchRootItem():

	def __init__(self):
		self.child_count = 0
		self.child_items = []
		self.level = 0

	def getChildItem(self, row):
		return self.child_items[row]

	def getParentItem(self):
		return None

	def getRow(self):
		return 0

	def childCount(self):
		return self.child_count

	def hasChildren(self):
		return self.child_count > 0

	def getData(self, column):
		return ""

# Branch data preparation

def BranchDataPrep(query):
	data = []
	for i in xrange(0, 8):
		data.append(query.value(i))
	data.append(tohex(query.value(8)).rjust(16) + " " + query.value(9) + offstr(query.value(10)) +
			" (" + dsoname(query.value(11)) + ")" + " -> " +
			tohex(query.value(12)) + " " + query.value(13) + offstr(query.value(14)) +
			" (" + dsoname(query.value(15)) + ")")
	return data

# Branch data model

class BranchModel(TreeModel):

	progress = Signal(object)

	def __init__(self, glb, event_id, where_clause, parent=None):
		super(BranchModel, self).__init__(glb, parent)
		self.event_id = event_id
		self.more = True
		self.populated = 0
		sql = ("SELECT samples.id, time, cpu, comm, pid, tid, branch_types.name,"
			" CASE WHEN in_tx = '0' THEN 'No' ELSE 'Yes' END,"
			" ip, symbols.name, sym_offset, dsos.short_name,"
			" to_ip, to_symbols.name, to_sym_offset, to_dsos.short_name"
			" FROM samples"
			" INNER JOIN comms ON comm_id = comms.id"
			" INNER JOIN threads ON thread_id = threads.id"
			" INNER JOIN branch_types ON branch_type = branch_types.id"
			" INNER JOIN symbols ON symbol_id = symbols.id"
			" INNER JOIN symbols to_symbols ON to_symbol_id = to_symbols.id"
			" INNER JOIN dsos ON samples.dso_id = dsos.id"
			" INNER JOIN dsos AS to_dsos ON samples.to_dso_id = to_dsos.id"
			" WHERE samples.id > $$last_id$$" + where_clause +
			" AND evsel_id = " + str(self.event_id) +
			" ORDER BY samples.id"
			" LIMIT " + str(glb_chunk_sz))
		self.fetcher = SQLFetcher(glb, sql, BranchDataPrep, self.AddSample)
		self.fetcher.done.connect(self.Update)
		self.fetcher.Fetch(glb_chunk_sz)

	def GetRoot(self):
		return BranchRootItem()

	def columnCount(self, parent=None):
		return 8

	def columnHeader(self, column):
		return ("Time", "CPU", "Command", "PID", "TID", "Branch Type", "In Tx", "Branch")[column]

	def columnFont(self, column):
		if column != 7:
			return None
		return QFont("Monospace")

	def DisplayData(self, item, index):
		if item.level == 1:
			self.FetchIfNeeded(item.row)
		return item.getData(index.column())

	def AddSample(self, data):
		child = BranchLevelOneItem(self.glb, self.populated, data, self.root)
		self.root.child_items.append(child)
		self.populated += 1

	def Update(self, fetched):
		if not fetched:
			self.more = False
			self.progress.emit(0)
		child_count = self.root.child_count
		count = self.populated - child_count
		if count > 0:
			parent = QModelIndex()
			self.beginInsertRows(parent, child_count, child_count + count - 1)
			self.insertRows(child_count, count, parent)
			self.root.child_count += count
			self.endInsertRows()
			self.progress.emit(self.root.child_count)

	def FetchMoreRecords(self, count):
		current = self.root.child_count
		if self.more:
			self.fetcher.Fetch(count)
		else:
			self.progress.emit(0)
		return current

	def HasMoreRecords(self):
		return self.more

# Report Variables

class ReportVars():

	def __init__(self, name = "", where_clause = "", limit = ""):
		self.name = name
		self.where_clause = where_clause
		self.limit = limit

	def UniqueId(self):
		return str(self.where_clause + ";" + self.limit)

# Branch window

class BranchWindow(QMdiSubWindow):

	def __init__(self, glb, event_id, report_vars, parent=None):
		super(BranchWindow, self).__init__(parent)

		model_name = "Branch Events " + str(event_id) +  " " + report_vars.UniqueId()

		self.model = LookupCreateModel(model_name, lambda: BranchModel(glb, event_id, report_vars.where_clause))

		self.view = QTreeView()
		self.view.setUniformRowHeights(True)
		self.view.setModel(self.model)

		self.ResizeColumnsToContents()

		self.find_bar = FindBar(self, self, True)

		self.finder = ChildDataItemFinder(self.model.root)

		self.fetch_bar = FetchMoreRecordsBar(self.model, self)

		self.vbox = VBox(self.view, self.find_bar.Widget(), self.fetch_bar.Widget())

		self.setWidget(self.vbox.Widget())

		AddSubWindow(glb.mainwindow.mdi_area, self, report_vars.name + " Branch Events")

	def ResizeColumnToContents(self, column, n):
		# Using the view's resizeColumnToContents() here is extrememly slow
		# so implement a crude alternative
		mm = "MM" if column else "MMMM"
		font = self.view.font()
		metrics = QFontMetrics(font)
		max = 0
		for row in xrange(n):
			val = self.model.root.child_items[row].data[column]
			len = metrics.width(str(val) + mm)
			max = len if len > max else max
		val = self.model.columnHeader(column)
		len = metrics.width(str(val) + mm)
		max = len if len > max else max
		self.view.setColumnWidth(column, max)

	def ResizeColumnsToContents(self):
		n = min(self.model.root.child_count, 100)
		if n < 1:
			# No data yet, so connect a signal to notify when there is
			self.model.rowsInserted.connect(self.UpdateColumnWidths)
			return
		columns = self.model.columnCount()
		for i in xrange(columns):
			self.ResizeColumnToContents(i, n)

	def UpdateColumnWidths(self, *x):
		# This only needs to be done once, so disconnect the signal now
		self.model.rowsInserted.disconnect(self.UpdateColumnWidths)
		self.ResizeColumnsToContents()

	def Find(self, value, direction, pattern, context):
		self.view.setFocus()
		self.find_bar.Busy()
		self.finder.Find(value, direction, pattern, context, self.FindDone)

	def FindDone(self, row):
		self.find_bar.Idle()
		if row >= 0:
			self.view.setCurrentIndex(self.model.index(row, 0, QModelIndex()))
		else:
			self.find_bar.NotFound()

# Line edit data item

class LineEditDataItem(object):

	def __init__(self, glb, label, placeholder_text, parent, id = "", default = ""):
		self.glb = glb
		self.label = label
		self.placeholder_text = placeholder_text
		self.parent = parent
		self.id = id

		self.value = default

		self.widget = QLineEdit(default)
		self.widget.editingFinished.connect(self.Validate)
		self.widget.textChanged.connect(self.Invalidate)
		self.red = False
		self.error = ""
		self.validated = True

		if placeholder_text:
			self.widget.setPlaceholderText(placeholder_text)

	def TurnTextRed(self):
		if not self.red:
			palette = QPalette()
			palette.setColor(QPalette.Text,Qt.red)
			self.widget.setPalette(palette)
			self.red = True

	def TurnTextNormal(self):
		if self.red:
			palette = QPalette()
			self.widget.setPalette(palette)
			self.red = False

	def InvalidValue(self, value):
		self.value = ""
		self.TurnTextRed()
		self.error = self.label + " invalid value '" + value + "'"
		self.parent.ShowMessage(self.error)

	def Invalidate(self):
		self.validated = False

	def DoValidate(self, input_string):
		self.value = input_string.strip()

	def Validate(self):
		self.validated = True
		self.error = ""
		self.TurnTextNormal()
		self.parent.ClearMessage()
		input_string = self.widget.text()
		if not len(input_string.strip()):
			self.value = ""
			return
		self.DoValidate(input_string)

	def IsValid(self):
		if not self.validated:
			self.Validate()
		if len(self.error):
			self.parent.ShowMessage(self.error)
			return False
		return True

	def IsNumber(self, value):
		try:
			x = int(value)
		except:
			x = 0
		return str(x) == value

# Non-negative integer ranges dialog data item

class NonNegativeIntegerRangesDataItem(LineEditDataItem):

	def __init__(self, glb, label, placeholder_text, column_name, parent):
		super(NonNegativeIntegerRangesDataItem, self).__init__(glb, label, placeholder_text, parent)

		self.column_name = column_name

	def DoValidate(self, input_string):
		singles = []
		ranges = []
		for value in [x.strip() for x in input_string.split(",")]:
			if "-" in value:
				vrange = value.split("-")
				if len(vrange) != 2 or not self.IsNumber(vrange[0]) or not self.IsNumber(vrange[1]):
					return self.InvalidValue(value)
				ranges.append(vrange)
			else:
				if not self.IsNumber(value):
					return self.InvalidValue(value)
				singles.append(value)
		ranges = [("(" + self.column_name + " >= " + r[0] + " AND " + self.column_name + " <= " + r[1] + ")") for r in ranges]
		if len(singles):
			ranges.append(self.column_name + " IN (" + ",".join(singles) + ")")
		self.value = " OR ".join(ranges)

# Positive integer dialog data item

class PositiveIntegerDataItem(LineEditDataItem):

	def __init__(self, glb, label, placeholder_text, parent, id = "", default = ""):
		super(PositiveIntegerDataItem, self).__init__(glb, label, placeholder_text, parent, id, default)

	def DoValidate(self, input_string):
		if not self.IsNumber(input_string.strip()):
			return self.InvalidValue(input_string)
		value = int(input_string.strip())
		if value <= 0:
			return self.InvalidValue(input_string)
		self.value = str(value)

# Dialog data item converted and validated using a SQL table

class SQLTableDataItem(LineEditDataItem):

	def __init__(self, glb, label, placeholder_text, table_name, match_column, column_name1, column_name2, parent):
		super(SQLTableDataItem, self).__init__(glb, label, placeholder_text, parent)

		self.table_name = table_name
		self.match_column = match_column
		self.column_name1 = column_name1
		self.column_name2 = column_name2

	def ValueToIds(self, value):
		ids = []
		query = QSqlQuery(self.glb.db)
		stmt = "SELECT id FROM " + self.table_name + " WHERE " + self.match_column + " = '" + value + "'"
		ret = query.exec_(stmt)
		if ret:
			while query.next():
				ids.append(str(query.value(0)))
		return ids

	def DoValidate(self, input_string):
		all_ids = []
		for value in [x.strip() for x in input_string.split(",")]:
			ids = self.ValueToIds(value)
			if len(ids):
				all_ids.extend(ids)
			else:
				return self.InvalidValue(value)
		self.value = self.column_name1 + " IN (" + ",".join(all_ids) + ")"
		if self.column_name2:
			self.value = "( " + self.value + " OR " + self.column_name2 + " IN (" + ",".join(all_ids) + ") )"

# Sample time ranges dialog data item converted and validated using 'samples' SQL table

class SampleTimeRangesDataItem(LineEditDataItem):

	def __init__(self, glb, label, placeholder_text, column_name, parent):
		self.column_name = column_name

		self.last_id = 0
		self.first_time = 0
		self.last_time = 2 ** 64

		query = QSqlQuery(glb.db)
		QueryExec(query, "SELECT id, time FROM samples ORDER BY id DESC LIMIT 1")
		if query.next():
			self.last_id = int(query.value(0))
			self.last_time = int(query.value(1))
		QueryExec(query, "SELECT time FROM samples WHERE time != 0 ORDER BY id LIMIT 1")
		if query.next():
			self.first_time = int(query.value(0))
		if placeholder_text:
			placeholder_text += ", between " + str(self.first_time) + " and " + str(self.last_time)

		super(SampleTimeRangesDataItem, self).__init__(glb, label, placeholder_text, parent)

	def IdBetween(self, query, lower_id, higher_id, order):
		QueryExec(query, "SELECT id FROM samples WHERE id > " + str(lower_id) + " AND id < " + str(higher_id) + " ORDER BY id " + order + " LIMIT 1")
		if query.next():
			return True, int(query.value(0))
		else:
			return False, 0

	def BinarySearchTime(self, lower_id, higher_id, target_time, get_floor):
		query = QSqlQuery(self.glb.db)
		while True:
			next_id = int((lower_id + higher_id) / 2)
			QueryExec(query, "SELECT time FROM samples WHERE id = " + str(next_id))
			if not query.next():
				ok, dbid = self.IdBetween(query, lower_id, next_id, "DESC")
				if not ok:
					ok, dbid = self.IdBetween(query, next_id, higher_id, "")
					if not ok:
						return str(higher_id)
				next_id = dbid
				QueryExec(query, "SELECT time FROM samples WHERE id = " + str(next_id))
			next_time = int(query.value(0))
			if get_floor:
				if target_time > next_time:
					lower_id = next_id
				else:
					higher_id = next_id
				if higher_id <= lower_id + 1:
					return str(higher_id)
			else:
				if target_time >= next_time:
					lower_id = next_id
				else:
					higher_id = next_id
				if higher_id <= lower_id + 1:
					return str(lower_id)

	def ConvertRelativeTime(self, val):
		mult = 1
		suffix = val[-2:]
		if suffix == "ms":
			mult = 1000000
		elif suffix == "us":
			mult = 1000
		elif suffix == "ns":
			mult = 1
		else:
			return val
		val = val[:-2].strip()
		if not self.IsNumber(val):
			return val
		val = int(val) * mult
		if val >= 0:
			val += self.first_time
		else:
			val += self.last_time
		return str(val)

	def ConvertTimeRange(self, vrange):
		if vrange[0] == "":
			vrange[0] = str(self.first_time)
		if vrange[1] == "":
			vrange[1] = str(self.last_time)
		vrange[0] = self.ConvertRelativeTime(vrange[0])
		vrange[1] = self.ConvertRelativeTime(vrange[1])
		if not self.IsNumber(vrange[0]) or not self.IsNumber(vrange[1]):
			return False
		beg_range = max(int(vrange[0]), self.first_time)
		end_range = min(int(vrange[1]), self.last_time)
		if beg_range > self.last_time or end_range < self.first_time:
			return False
		vrange[0] = self.BinarySearchTime(0, self.last_id, beg_range, True)
		vrange[1] = self.BinarySearchTime(1, self.last_id + 1, end_range, False)
		return True

	def AddTimeRange(self, value, ranges):
		n = value.count("-")
		if n == 1:
			pass
		elif n == 2:
			if value.split("-")[1].strip() == "":
				n = 1
		elif n == 3:
			n = 2
		else:
			return False
		pos = findnth(value, "-", n)
		vrange = [value[:pos].strip() ,value[pos+1:].strip()]
		if self.ConvertTimeRange(vrange):
			ranges.append(vrange)
			return True
		return False

	def DoValidate(self, input_string):
		ranges = []
		for value in [x.strip() for x in input_string.split(",")]:
			if not self.AddTimeRange(value, ranges):
				return self.InvalidValue(value)
		ranges = [("(" + self.column_name + " >= " + r[0] + " AND " + self.column_name + " <= " + r[1] + ")") for r in ranges]
		self.value = " OR ".join(ranges)

# Report Dialog Base

class ReportDialogBase(QDialog):

	def __init__(self, glb, title, items, partial, parent=None):
		super(ReportDialogBase, self).__init__(parent)

		self.glb = glb

		self.report_vars = ReportVars()

		self.setWindowTitle(title)
		self.setMinimumWidth(600)

		self.data_items = [x(glb, self) for x in items]

		self.partial = partial

		self.grid = QGridLayout()

		for row in xrange(len(self.data_items)):
			self.grid.addWidget(QLabel(self.data_items[row].label), row, 0)
			self.grid.addWidget(self.data_items[row].widget, row, 1)

		self.status = QLabel()

		self.ok_button = QPushButton("Ok", self)
		self.ok_button.setDefault(True)
		self.ok_button.released.connect(self.Ok)
		self.ok_button.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

		self.cancel_button = QPushButton("Cancel", self)
		self.cancel_button.released.connect(self.reject)
		self.cancel_button.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

		self.hbox = QHBoxLayout()
		#self.hbox.addStretch()
		self.hbox.addWidget(self.status)
		self.hbox.addWidget(self.ok_button)
		self.hbox.addWidget(self.cancel_button)

		self.vbox = QVBoxLayout()
		self.vbox.addLayout(self.grid)
		self.vbox.addLayout(self.hbox)

		self.setLayout(self.vbox);

	def Ok(self):
		vars = self.report_vars
		for d in self.data_items:
			if d.id == "REPORTNAME":
				vars.name = d.value
		if not vars.name:
			self.ShowMessage("Report name is required")
			return
		for d in self.data_items:
			if not d.IsValid():
				return
		for d in self.data_items[1:]:
			if d.id == "LIMIT":
				vars.limit = d.value
			elif len(d.value):
				if len(vars.where_clause):
					vars.where_clause += " AND "
				vars.where_clause += d.value
		if len(vars.where_clause):
			if self.partial:
				vars.where_clause = " AND ( " + vars.where_clause + " ) "
			else:
				vars.where_clause = " WHERE " + vars.where_clause + " "
		self.accept()

	def ShowMessage(self, msg):
		self.status.setText("<font color=#FF0000>" + msg)

	def ClearMessage(self):
		self.status.setText("")

# Selected branch report creation dialog

class SelectedBranchDialog(ReportDialogBase):

	def __init__(self, glb, parent=None):
		title = "Selected Branches"
		items = (lambda g, p: LineEditDataItem(g, "Report name:", "Enter a name to appear in the window title bar", p, "REPORTNAME"),
			 lambda g, p: SampleTimeRangesDataItem(g, "Time ranges:", "Enter time ranges", "samples.id", p),
			 lambda g, p: NonNegativeIntegerRangesDataItem(g, "CPUs:", "Enter CPUs or ranges e.g. 0,5-6", "cpu", p),
			 lambda g, p: SQLTableDataItem(g, "Commands:", "Only branches with these commands will be included", "comms", "comm", "comm_id", "", p),
			 lambda g, p: SQLTableDataItem(g, "PIDs:", "Only branches with these process IDs will be included", "threads", "pid", "thread_id", "", p),
			 lambda g, p: SQLTableDataItem(g, "TIDs:", "Only branches with these thread IDs will be included", "threads", "tid", "thread_id", "", p),
			 lambda g, p: SQLTableDataItem(g, "DSOs:", "Only branches with these DSOs will be included", "dsos", "short_name", "samples.dso_id", "to_dso_id", p),
			 lambda g, p: SQLTableDataItem(g, "Symbols:", "Only branches with these symbols will be included", "symbols", "name", "symbol_id", "to_symbol_id", p),
			 lambda g, p: LineEditDataItem(g, "Raw SQL clause: ", "Enter a raw SQL WHERE clause", p))
		super(SelectedBranchDialog, self).__init__(glb, title, items, True, parent)

# Event list

def GetEventList(db):
	events = []
	query = QSqlQuery(db)
	QueryExec(query, "SELECT name FROM selected_events WHERE id > 0 ORDER BY id")
	while query.next():
		events.append(query.value(0))
	return events

# Is a table selectable

def IsSelectable(db, table, sql = ""):
	query = QSqlQuery(db)
	try:
		QueryExec(query, "SELECT * FROM " + table + " " + sql + " LIMIT 1")
	except:
		return False
	return True

# SQL data preparation

def SQLTableDataPrep(query, count):
	data = []
	for i in xrange(count):
		data.append(query.value(i))
	return data

# SQL table data model item

class SQLTableItem():

	def __init__(self, row, data):
		self.row = row
		self.data = data

	def getData(self, column):
		return self.data[column]

# SQL table data model

class SQLTableModel(TableModel):

	progress = Signal(object)

	def __init__(self, glb, sql, column_headers, parent=None):
		super(SQLTableModel, self).__init__(parent)
		self.glb = glb
		self.more = True
		self.populated = 0
		self.column_headers = column_headers
		self.fetcher = SQLFetcher(glb, sql, lambda x, y=len(column_headers): SQLTableDataPrep(x, y), self.AddSample)
		self.fetcher.done.connect(self.Update)
		self.fetcher.Fetch(glb_chunk_sz)

	def DisplayData(self, item, index):
		self.FetchIfNeeded(item.row)
		return item.getData(index.column())

	def AddSample(self, data):
		child = SQLTableItem(self.populated, data)
		self.child_items.append(child)
		self.populated += 1

	def Update(self, fetched):
		if not fetched:
			self.more = False
			self.progress.emit(0)
		child_count = self.child_count
		count = self.populated - child_count
		if count > 0:
			parent = QModelIndex()
			self.beginInsertRows(parent, child_count, child_count + count - 1)
			self.insertRows(child_count, count, parent)
			self.child_count += count
			self.endInsertRows()
			self.progress.emit(self.child_count)

	def FetchMoreRecords(self, count):
		current = self.child_count
		if self.more:
			self.fetcher.Fetch(count)
		else:
			self.progress.emit(0)
		return current

	def HasMoreRecords(self):
		return self.more

	def columnCount(self, parent=None):
		return len(self.column_headers)

	def columnHeader(self, column):
		return self.column_headers[column]

# SQL automatic table data model

class SQLAutoTableModel(SQLTableModel):

	def __init__(self, glb, table_name, parent=None):
		sql = "SELECT * FROM " + table_name + " WHERE id > $$last_id$$ ORDER BY id LIMIT " + str(glb_chunk_sz)
		if table_name == "comm_threads_view":
			# For now, comm_threads_view has no id column
			sql = "SELECT * FROM " + table_name + " WHERE comm_id > $$last_id$$ ORDER BY comm_id LIMIT " + str(glb_chunk_sz)
		column_headers = []
		query = QSqlQuery(glb.db)
		if glb.dbref.is_sqlite3:
			QueryExec(query, "PRAGMA table_info(" + table_name + ")")
			while query.next():
				column_headers.append(query.value(1))
			if table_name == "sqlite_master":
				sql = "SELECT * FROM " + table_name
		else:
			if table_name[:19] == "information_schema.":
				sql = "SELECT * FROM " + table_name
				select_table_name = table_name[19:]
				schema = "information_schema"
			else:
				select_table_name = table_name
				schema = "public"
			QueryExec(query, "SELECT column_name FROM information_schema.columns WHERE table_schema = '" + schema + "' and table_name = '" + select_table_name + "'")
			while query.next():
				column_headers.append(query.value(0))
		super(SQLAutoTableModel, self).__init__(glb, sql, column_headers, parent)

# Base class for custom ResizeColumnsToContents

class ResizeColumnsToContentsBase(QObject):

	def __init__(self, parent=None):
		super(ResizeColumnsToContentsBase, self).__init__(parent)

	def ResizeColumnToContents(self, column, n):
		# Using the view's resizeColumnToContents() here is extrememly slow
		# so implement a crude alternative
		font = self.view.font()
		metrics = QFontMetrics(font)
		max = 0
		for row in xrange(n):
			val = self.data_model.child_items[row].data[column]
			len = metrics.width(str(val) + "MM")
			max = len if len > max else max
		val = self.data_model.columnHeader(column)
		len = metrics.width(str(val) + "MM")
		max = len if len > max else max
		self.view.setColumnWidth(column, max)

	def ResizeColumnsToContents(self):
		n = min(self.data_model.child_count, 100)
		if n < 1:
			# No data yet, so connect a signal to notify when there is
			self.data_model.rowsInserted.connect(self.UpdateColumnWidths)
			return
		columns = self.data_model.columnCount()
		for i in xrange(columns):
			self.ResizeColumnToContents(i, n)

	def UpdateColumnWidths(self, *x):
		# This only needs to be done once, so disconnect the signal now
		self.data_model.rowsInserted.disconnect(self.UpdateColumnWidths)
		self.ResizeColumnsToContents()

# Table window

class TableWindow(QMdiSubWindow, ResizeColumnsToContentsBase):

	def __init__(self, glb, table_name, parent=None):
		super(TableWindow, self).__init__(parent)

		self.data_model = LookupCreateModel(table_name + " Table", lambda: SQLAutoTableModel(glb, table_name))

		self.model = QSortFilterProxyModel()
		self.model.setSourceModel(self.data_model)

		self.view = QTableView()
		self.view.setModel(self.model)
		self.view.setEditTriggers(QAbstractItemView.NoEditTriggers)
		self.view.verticalHeader().setVisible(False)
		self.view.sortByColumn(-1, Qt.AscendingOrder)
		self.view.setSortingEnabled(True)

		self.ResizeColumnsToContents()

		self.find_bar = FindBar(self, self, True)

		self.finder = ChildDataItemFinder(self.data_model)

		self.fetch_bar = FetchMoreRecordsBar(self.data_model, self)

		self.vbox = VBox(self.view, self.find_bar.Widget(), self.fetch_bar.Widget())

		self.setWidget(self.vbox.Widget())

		AddSubWindow(glb.mainwindow.mdi_area, self, table_name + " Table")

	def Find(self, value, direction, pattern, context):
		self.view.setFocus()
		self.find_bar.Busy()
		self.finder.Find(value, direction, pattern, context, self.FindDone)

	def FindDone(self, row):
		self.find_bar.Idle()
		if row >= 0:
			self.view.setCurrentIndex(self.model.mapFromSource(self.data_model.index(row, 0, QModelIndex())))
		else:
			self.find_bar.NotFound()

# Table list

def GetTableList(glb):
	tables = []
	query = QSqlQuery(glb.db)
	if glb.dbref.is_sqlite3:
		QueryExec(query, "SELECT name FROM sqlite_master WHERE type IN ( 'table' , 'view' ) ORDER BY name")
	else:
		QueryExec(query, "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public' AND table_type IN ( 'BASE TABLE' , 'VIEW' ) ORDER BY table_name")
	while query.next():
		tables.append(query.value(0))
	if glb.dbref.is_sqlite3:
		tables.append("sqlite_master")
	else:
		tables.append("information_schema.tables")
		tables.append("information_schema.views")
		tables.append("information_schema.columns")
	return tables

# Top Calls data model

class TopCallsModel(SQLTableModel):

	def __init__(self, glb, report_vars, parent=None):
		text = ""
		if not glb.dbref.is_sqlite3:
			text = "::text"
		limit = ""
		if len(report_vars.limit):
			limit = " LIMIT " + report_vars.limit
		sql = ("SELECT comm, pid, tid, name,"
			" CASE"
			" WHEN (short_name = '[kernel.kallsyms]') THEN '[kernel]'" + text +
			" ELSE short_name"
			" END AS dso,"
			" call_time, return_time, (return_time - call_time) AS elapsed_time, branch_count, "
			" CASE"
			" WHEN (calls.flags = 1) THEN 'no call'" + text +
			" WHEN (calls.flags = 2) THEN 'no return'" + text +
			" WHEN (calls.flags = 3) THEN 'no call/return'" + text +
			" ELSE ''" + text +
			" END AS flags"
			" FROM calls"
			" INNER JOIN call_paths ON calls.call_path_id = call_paths.id"
			" INNER JOIN symbols ON call_paths.symbol_id = symbols.id"
			" INNER JOIN dsos ON symbols.dso_id = dsos.id"
			" INNER JOIN comms ON calls.comm_id = comms.id"
			" INNER JOIN threads ON calls.thread_id = threads.id" +
			report_vars.where_clause +
			" ORDER BY elapsed_time DESC" +
			limit
			)
		column_headers = ("Command", "PID", "TID", "Symbol", "Object", "Call Time", "Return Time", "Elapsed Time (ns)", "Branch Count", "Flags")
		self.alignment = (Qt.AlignLeft, Qt.AlignLeft, Qt.AlignLeft, Qt.AlignLeft, Qt.AlignLeft, Qt.AlignLeft, Qt.AlignLeft, Qt.AlignRight, Qt.AlignRight, Qt.AlignLeft)
		super(TopCallsModel, self).__init__(glb, sql, column_headers, parent)

	def columnAlignment(self, column):
		return self.alignment[column]

# Top Calls report creation dialog

class TopCallsDialog(ReportDialogBase):

	def __init__(self, glb, parent=None):
		title = "Top Calls by Elapsed Time"
		items = (lambda g, p: LineEditDataItem(g, "Report name:", "Enter a name to appear in the window title bar", p, "REPORTNAME"),
			 lambda g, p: SQLTableDataItem(g, "Commands:", "Only calls with these commands will be included", "comms", "comm", "comm_id", "", p),
			 lambda g, p: SQLTableDataItem(g, "PIDs:", "Only calls with these process IDs will be included", "threads", "pid", "thread_id", "", p),
			 lambda g, p: SQLTableDataItem(g, "TIDs:", "Only calls with these thread IDs will be included", "threads", "tid", "thread_id", "", p),
			 lambda g, p: SQLTableDataItem(g, "DSOs:", "Only calls with these DSOs will be included", "dsos", "short_name", "dso_id", "", p),
			 lambda g, p: SQLTableDataItem(g, "Symbols:", "Only calls with these symbols will be included", "symbols", "name", "symbol_id", "", p),
			 lambda g, p: LineEditDataItem(g, "Raw SQL clause: ", "Enter a raw SQL WHERE clause", p),
			 lambda g, p: PositiveIntegerDataItem(g, "Record limit:", "Limit selection to this number of records", p, "LIMIT", "100"))
		super(TopCallsDialog, self).__init__(glb, title, items, False, parent)

# Top Calls window

class TopCallsWindow(QMdiSubWindow, ResizeColumnsToContentsBase):

	def __init__(self, glb, report_vars, parent=None):
		super(TopCallsWindow, self).__init__(parent)

		self.data_model = LookupCreateModel("Top Calls " + report_vars.UniqueId(), lambda: TopCallsModel(glb, report_vars))
		self.model = self.data_model

		self.view = QTableView()
		self.view.setModel(self.model)
		self.view.setEditTriggers(QAbstractItemView.NoEditTriggers)
		self.view.verticalHeader().setVisible(False)

		self.ResizeColumnsToContents()

		self.find_bar = FindBar(self, self, True)

		self.finder = ChildDataItemFinder(self.model)

		self.fetch_bar = FetchMoreRecordsBar(self.data_model, self)

		self.vbox = VBox(self.view, self.find_bar.Widget(), self.fetch_bar.Widget())

		self.setWidget(self.vbox.Widget())

		AddSubWindow(glb.mainwindow.mdi_area, self, report_vars.name)

	def Find(self, value, direction, pattern, context):
		self.view.setFocus()
		self.find_bar.Busy()
		self.finder.Find(value, direction, pattern, context, self.FindDone)

	def FindDone(self, row):
		self.find_bar.Idle()
		if row >= 0:
			self.view.setCurrentIndex(self.model.index(row, 0, QModelIndex()))
		else:
			self.find_bar.NotFound()

# Action Definition

def CreateAction(label, tip, callback, parent=None, shortcut=None):
	action = QAction(label, parent)
	if shortcut != None:
		action.setShortcuts(shortcut)
	action.setStatusTip(tip)
	action.triggered.connect(callback)
	return action

# Typical application actions

def CreateExitAction(app, parent=None):
	return CreateAction("&Quit", "Exit the application", app.closeAllWindows, parent, QKeySequence.Quit)

# Typical MDI actions

def CreateCloseActiveWindowAction(mdi_area):
	return CreateAction("Cl&ose", "Close the active window", mdi_area.closeActiveSubWindow, mdi_area)

def CreateCloseAllWindowsAction(mdi_area):
	return CreateAction("Close &All", "Close all the windows", mdi_area.closeAllSubWindows, mdi_area)

def CreateTileWindowsAction(mdi_area):
	return CreateAction("&Tile", "Tile the windows", mdi_area.tileSubWindows, mdi_area)

def CreateCascadeWindowsAction(mdi_area):
	return CreateAction("&Cascade", "Cascade the windows", mdi_area.cascadeSubWindows, mdi_area)

def CreateNextWindowAction(mdi_area):
	return CreateAction("Ne&xt", "Move the focus to the next window", mdi_area.activateNextSubWindow, mdi_area, QKeySequence.NextChild)

def CreatePreviousWindowAction(mdi_area):
	return CreateAction("Pre&vious", "Move the focus to the previous window", mdi_area.activatePreviousSubWindow, mdi_area, QKeySequence.PreviousChild)

# Typical MDI window menu

class WindowMenu():

	def __init__(self, mdi_area, menu):
		self.mdi_area = mdi_area
		self.window_menu = menu.addMenu("&Windows")
		self.close_active_window = CreateCloseActiveWindowAction(mdi_area)
		self.close_all_windows = CreateCloseAllWindowsAction(mdi_area)
		self.tile_windows = CreateTileWindowsAction(mdi_area)
		self.cascade_windows = CreateCascadeWindowsAction(mdi_area)
		self.next_window = CreateNextWindowAction(mdi_area)
		self.previous_window = CreatePreviousWindowAction(mdi_area)
		self.window_menu.aboutToShow.connect(self.Update)

	def Update(self):
		self.window_menu.clear()
		sub_window_count = len(self.mdi_area.subWindowList())
		have_sub_windows = sub_window_count != 0
		self.close_active_window.setEnabled(have_sub_windows)
		self.close_all_windows.setEnabled(have_sub_windows)
		self.tile_windows.setEnabled(have_sub_windows)
		self.cascade_windows.setEnabled(have_sub_windows)
		self.next_window.setEnabled(have_sub_windows)
		self.previous_window.setEnabled(have_sub_windows)
		self.window_menu.addAction(self.close_active_window)
		self.window_menu.addAction(self.close_all_windows)
		self.window_menu.addSeparator()
		self.window_menu.addAction(self.tile_windows)
		self.window_menu.addAction(self.cascade_windows)
		self.window_menu.addSeparator()
		self.window_menu.addAction(self.next_window)
		self.window_menu.addAction(self.previous_window)
		if sub_window_count == 0:
			return
		self.window_menu.addSeparator()
		nr = 1
		for sub_window in self.mdi_area.subWindowList():
			label = str(nr) + " " + sub_window.name
			if nr < 10:
				label = "&" + label
			action = self.window_menu.addAction(label)
			action.setCheckable(True)
			action.setChecked(sub_window == self.mdi_area.activeSubWindow())
			action.triggered.connect(lambda x=nr: self.setActiveSubWindow(x))
			self.window_menu.addAction(action)
			nr += 1

	def setActiveSubWindow(self, nr):
		self.mdi_area.setActiveSubWindow(self.mdi_area.subWindowList()[nr - 1])

# Help text

glb_help_text = """
<h1>Contents</h1>
<style>
p.c1 {
    text-indent: 40px;
}
p.c2 {
    text-indent: 80px;
}
}
</style>
<p class=c1><a href=#reports>1. Reports</a></p>
<p class=c2><a href=#callgraph>1.1 Context-Sensitive Call Graph</a></p>
<p class=c2><a href=#calltree>1.2 Call Tree</a></p>
<p class=c2><a href=#allbranches>1.3 All branches</a></p>
<p class=c2><a href=#selectedbranches>1.4 Selected branches</a></p>
<p class=c2><a href=#topcallsbyelapsedtime>1.5 Top calls by elapsed time</a></p>
<p class=c1><a href=#tables>2. Tables</a></p>
<h1 id=reports>1. Reports</h1>
<h2 id=callgraph>1.1 Context-Sensitive Call Graph</h2>
The result is a GUI window with a tree representing a context-sensitive
call-graph. Expanding a couple of levels of the tree and adjusting column
widths to suit will display something like:
<pre>
                                         Call Graph: pt_example
Call Path                          Object      Count   Time(ns)  Time(%)  Branch Count   Branch Count(%)
v- ls
    v- 2638:2638
        v- _start                  ld-2.19.so    1     10074071   100.0         211135            100.0
          |- unknown               unknown       1        13198     0.1              1              0.0
          >- _dl_start             ld-2.19.so    1      1400980    13.9          19637              9.3
          >- _d_linit_internal     ld-2.19.so    1       448152     4.4          11094              5.3
          v-__libc_start_main@plt  ls            1      8211741    81.5         180397             85.4
             >- _dl_fixup          ld-2.19.so    1         7607     0.1            108              0.1
             >- __cxa_atexit       libc-2.19.so  1        11737     0.1             10              0.0
             >- __libc_csu_init    ls            1        10354     0.1             10              0.0
             |- _setjmp            libc-2.19.so  1            0     0.0              4              0.0
             v- main               ls            1      8182043    99.6         180254             99.9
</pre>
<h3>Points to note:</h3>
<ul>
<li>The top level is a command name (comm)</li>
<li>The next level is a thread (pid:tid)</li>
<li>Subsequent levels are functions</li>
<li>'Count' is the number of calls</li>
<li>'Time' is the elapsed time until the function returns</li>
<li>Percentages are relative to the level above</li>
<li>'Branch Count' is the total number of branches for that function and all functions that it calls
</ul>
<h3>Find</h3>
Ctrl-F displays a Find bar which finds function names by either an exact match or a pattern match.
The pattern matching symbols are ? for any character and * for zero or more characters.
<h2 id=calltree>1.2 Call Tree</h2>
The Call Tree report is very similar to the Context-Sensitive Call Graph, but the data is not aggregated.
Also the 'Count' column, which would be always 1, is replaced by the 'Call Time'.
<h2 id=allbranches>1.3 All branches</h2>
The All branches report displays all branches in chronological order.
Not all data is fetched immediately. More records can be fetched using the Fetch bar provided.
<h3>Disassembly</h3>
Open a branch to display disassembly. This only works if:
<ol>
<li>The disassembler is available. Currently, only Intel XED is supported - see <a href=#xed>Intel XED Setup</a></li>
<li>The object code is available. Currently, only the perf build ID cache is searched for object code.
The default directory ~/.debug can be overridden by setting environment variable PERF_BUILDID_DIR.
One exception is kcore where the DSO long name is used (refer dsos_view on the Tables menu),
or alternatively, set environment variable PERF_KCORE to the kcore file name.</li>
</ol>
<h4 id=xed>Intel XED Setup</h4>
To use Intel XED, libxed.so must be present.  To build and install libxed.so:
<pre>
git clone https://github.com/intelxed/mbuild.git mbuild
git clone https://github.com/intelxed/xed
cd xed
./mfile.py --share
sudo ./mfile.py --prefix=/usr/local install
sudo ldconfig
</pre>
<h3>Find</h3>
Ctrl-F displays a Find bar which finds substrings by either an exact match or a regular expression match.
Refer to Python documentation for the regular expression syntax.
All columns are searched, but only currently fetched rows are searched.
<h2 id=selectedbranches>1.4 Selected branches</h2>
This is the same as the <a href=#allbranches>All branches</a> report but with the data reduced
by various selection criteria. A dialog box displays available criteria which are AND'ed together.
<h3>1.4.1 Time ranges</h3>
The time ranges hint text shows the total time range. Relative time ranges can also be entered in
ms, us or ns. Also, negative values are relative to the end of trace.  Examples:
<pre>
	81073085947329-81073085958238	From 81073085947329 to 81073085958238
	100us-200us		From 100us to 200us
	10ms-			From 10ms to the end
	-100ns			The first 100ns
	-10ms-			The last 10ms
</pre>
N.B. Due to the granularity of timestamps, there could be no branches in any given time range.
<h2 id=topcallsbyelapsedtime>1.5 Top calls by elapsed time</h2>
The Top calls by elapsed time report displays calls in descending order of time elapsed between when the function was called and when it returned.
The data is reduced by various selection criteria. A dialog box displays available criteria which are AND'ed together.
If not all data is fetched, a Fetch bar is provided. Ctrl-F displays a Find bar.
<h1 id=tables>2. Tables</h1>
The Tables menu shows all tables and views in the database. Most tables have an associated view
which displays the information in a more friendly way. Not all data for large tables is fetched
immediately. More records can be fetched using the Fetch bar provided. Columns can be sorted,
but that can be slow for large tables.
<p>There are also tables of database meta-information.
For SQLite3 databases, the sqlite_master table is included.
For PostgreSQL databases, information_schema.tables/views/columns are included.
<h3>Find</h3>
Ctrl-F displays a Find bar which finds substrings by either an exact match or a regular expression match.
Refer to Python documentation for the regular expression syntax.
All columns are searched, but only currently fetched rows are searched.
<p>N.B. Results are found in id order, so if the table is re-ordered, find-next and find-previous
will go to the next/previous result in id order, instead of display order.
"""

# Help window

class HelpWindow(QMdiSubWindow):

	def __init__(self, glb, parent=None):
		super(HelpWindow, self).__init__(parent)

		self.text = QTextBrowser()
		self.text.setHtml(glb_help_text)
		self.text.setReadOnly(True)
		self.text.setOpenExternalLinks(True)

		self.setWidget(self.text)

		AddSubWindow(glb.mainwindow.mdi_area, self, "Exported SQL Viewer Help")

# Main window that only displays the help text

class HelpOnlyWindow(QMainWindow):

	def __init__(self, parent=None):
		super(HelpOnlyWindow, self).__init__(parent)

		self.setMinimumSize(200, 100)
		self.resize(800, 600)
		self.setWindowTitle("Exported SQL Viewer Help")
		self.setWindowIcon(self.style().standardIcon(QStyle.SP_MessageBoxInformation))

		self.text = QTextBrowser()
		self.text.setHtml(glb_help_text)
		self.text.setReadOnly(True)
		self.text.setOpenExternalLinks(True)

		self.setCentralWidget(self.text)

# Font resize

def ResizeFont(widget, diff):
	font = widget.font()
	sz = font.pointSize()
	font.setPointSize(sz + diff)
	widget.setFont(font)

def ShrinkFont(widget):
	ResizeFont(widget, -1)

def EnlargeFont(widget):
	ResizeFont(widget, 1)

# Unique name for sub-windows

def NumberedWindowName(name, nr):
	if nr > 1:
		name += " <" + str(nr) + ">"
	return name

def UniqueSubWindowName(mdi_area, name):
	nr = 1
	while True:
		unique_name = NumberedWindowName(name, nr)
		ok = True
		for sub_window in mdi_area.subWindowList():
			if sub_window.name == unique_name:
				ok = False
				break
		if ok:
			return unique_name
		nr += 1

# Add a sub-window

def AddSubWindow(mdi_area, sub_window, name):
	unique_name = UniqueSubWindowName(mdi_area, name)
	sub_window.setMinimumSize(200, 100)
	sub_window.resize(800, 600)
	sub_window.setWindowTitle(unique_name)
	sub_window.setAttribute(Qt.WA_DeleteOnClose)
	sub_window.setWindowIcon(sub_window.style().standardIcon(QStyle.SP_FileIcon))
	sub_window.name = unique_name
	mdi_area.addSubWindow(sub_window)
	sub_window.show()

# Main window

class MainWindow(QMainWindow):

	def __init__(self, glb, parent=None):
		super(MainWindow, self).__init__(parent)

		self.glb = glb

		self.setWindowTitle("Exported SQL Viewer: " + glb.dbname)
		self.setWindowIcon(self.style().standardIcon(QStyle.SP_ComputerIcon))
		self.setMinimumSize(200, 100)

		self.mdi_area = QMdiArea()
		self.mdi_area.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
		self.mdi_area.setVerticalScrollBarPolicy(Qt.ScrollBarAsNeeded)

		self.setCentralWidget(self.mdi_area)

		menu = self.menuBar()

		file_menu = menu.addMenu("&File")
		file_menu.addAction(CreateExitAction(glb.app, self))

		edit_menu = menu.addMenu("&Edit")
		edit_menu.addAction(CreateAction("&Find...", "Find items", self.Find, self, QKeySequence.Find))
		edit_menu.addAction(CreateAction("Fetch &more records...", "Fetch more records", self.FetchMoreRecords, self, [QKeySequence(Qt.Key_F8)]))
		edit_menu.addAction(CreateAction("&Shrink Font", "Make text smaller", self.ShrinkFont, self, [QKeySequence("Ctrl+-")]))
		edit_menu.addAction(CreateAction("&Enlarge Font", "Make text bigger", self.EnlargeFont, self, [QKeySequence("Ctrl++")]))

		reports_menu = menu.addMenu("&Reports")
		if IsSelectable(glb.db, "calls"):
			reports_menu.addAction(CreateAction("Context-Sensitive Call &Graph", "Create a new window containing a context-sensitive call graph", self.NewCallGraph, self))

		if IsSelectable(glb.db, "calls", "WHERE parent_id >= 0"):
			reports_menu.addAction(CreateAction("Call &Tree", "Create a new window containing a call tree", self.NewCallTree, self))

		self.EventMenu(GetEventList(glb.db), reports_menu)

		if IsSelectable(glb.db, "calls"):
			reports_menu.addAction(CreateAction("&Top calls by elapsed time", "Create a new window displaying top calls by elapsed time", self.NewTopCalls, self))

		self.TableMenu(GetTableList(glb), menu)

		self.window_menu = WindowMenu(self.mdi_area, menu)

		help_menu = menu.addMenu("&Help")
		help_menu.addAction(CreateAction("&Exported SQL Viewer Help", "Helpful information", self.Help, self, QKeySequence.HelpContents))

	def Find(self):
		win = self.mdi_area.activeSubWindow()
		if win:
			try:
				win.find_bar.Activate()
			except:
				pass

	def FetchMoreRecords(self):
		win = self.mdi_area.activeSubWindow()
		if win:
			try:
				win.fetch_bar.Activate()
			except:
				pass

	def ShrinkFont(self):
		win = self.mdi_area.activeSubWindow()
		ShrinkFont(win.view)

	def EnlargeFont(self):
		win = self.mdi_area.activeSubWindow()
		EnlargeFont(win.view)

	def EventMenu(self, events, reports_menu):
		branches_events = 0
		for event in events:
			event = event.split(":")[0]
			if event == "branches":
				branches_events += 1
		dbid = 0
		for event in events:
			dbid += 1
			event = event.split(":")[0]
			if event == "branches":
				label = "All branches" if branches_events == 1 else "All branches " + "(id=" + dbid + ")"
				reports_menu.addAction(CreateAction(label, "Create a new window displaying branch events", lambda x=dbid: self.NewBranchView(x), self))
				label = "Selected branches" if branches_events == 1 else "Selected branches " + "(id=" + dbid + ")"
				reports_menu.addAction(CreateAction(label, "Create a new window displaying branch events", lambda x=dbid: self.NewSelectedBranchView(x), self))

	def TableMenu(self, tables, menu):
		table_menu = menu.addMenu("&Tables")
		for table in tables:
			table_menu.addAction(CreateAction(table, "Create a new window containing a table view", lambda t=table: self.NewTableView(t), self))

	def NewCallGraph(self):
		CallGraphWindow(self.glb, self)

	def NewCallTree(self):
		CallTreeWindow(self.glb, self)

	def NewTopCalls(self):
		dialog = TopCallsDialog(self.glb, self)
		ret = dialog.exec_()
		if ret:
			TopCallsWindow(self.glb, dialog.report_vars, self)

	def NewBranchView(self, event_id):
		BranchWindow(self.glb, event_id, ReportVars(), self)

	def NewSelectedBranchView(self, event_id):
		dialog = SelectedBranchDialog(self.glb, self)
		ret = dialog.exec_()
		if ret:
			BranchWindow(self.glb, event_id, dialog.report_vars, self)

	def NewTableView(self, table_name):
		TableWindow(self.glb, table_name, self)

	def Help(self):
		HelpWindow(self.glb, self)

# XED Disassembler

class xed_state_t(Structure):

	_fields_ = [
		("mode", c_int),
		("width", c_int)
	]

class XEDInstruction():

	def __init__(self, libxed):
		# Current xed_decoded_inst_t structure is 192 bytes. Use 512 to allow for future expansion
		xedd_t = c_byte * 512
		self.xedd = xedd_t()
		self.xedp = addressof(self.xedd)
		libxed.xed_decoded_inst_zero(self.xedp)
		self.state = xed_state_t()
		self.statep = addressof(self.state)
		# Buffer for disassembled instruction text
		self.buffer = create_string_buffer(256)
		self.bufferp = addressof(self.buffer)

class LibXED():

	def __init__(self):
		try:
			self.libxed = CDLL("libxed.so")
		except:
			self.libxed = None
		if not self.libxed:
			self.libxed = CDLL("/usr/local/lib/libxed.so")

		self.xed_tables_init = self.libxed.xed_tables_init
		self.xed_tables_init.restype = None
		self.xed_tables_init.argtypes = []

		self.xed_decoded_inst_zero = self.libxed.xed_decoded_inst_zero
		self.xed_decoded_inst_zero.restype = None
		self.xed_decoded_inst_zero.argtypes = [ c_void_p ]

		self.xed_operand_values_set_mode = self.libxed.xed_operand_values_set_mode
		self.xed_operand_values_set_mode.restype = None
		self.xed_operand_values_set_mode.argtypes = [ c_void_p, c_void_p ]

		self.xed_decoded_inst_zero_keep_mode = self.libxed.xed_decoded_inst_zero_keep_mode
		self.xed_decoded_inst_zero_keep_mode.restype = None
		self.xed_decoded_inst_zero_keep_mode.argtypes = [ c_void_p ]

		self.xed_decode = self.libxed.xed_decode
		self.xed_decode.restype = c_int
		self.xed_decode.argtypes = [ c_void_p, c_void_p, c_uint ]

		self.xed_format_context = self.libxed.xed_format_context
		self.xed_format_context.restype = c_uint
		self.xed_format_context.argtypes = [ c_int, c_void_p, c_void_p, c_int, c_ulonglong, c_void_p, c_void_p ]

		self.xed_tables_init()

	def Instruction(self):
		return XEDInstruction(self)

	def SetMode(self, inst, mode):
		if mode:
			inst.state.mode = 4 # 32-bit
			inst.state.width = 4 # 4 bytes
		else:
			inst.state.mode = 1 # 64-bit
			inst.state.width = 8 # 8 bytes
		self.xed_operand_values_set_mode(inst.xedp, inst.statep)

	def DisassembleOne(self, inst, bytes_ptr, bytes_cnt, ip):
		self.xed_decoded_inst_zero_keep_mode(inst.xedp)
		err = self.xed_decode(inst.xedp, bytes_ptr, bytes_cnt)
		if err:
			return 0, ""
		# Use AT&T mode (2), alternative is Intel (3)
		ok = self.xed_format_context(2, inst.xedp, inst.bufferp, sizeof(inst.buffer), ip, 0, 0)
		if not ok:
			return 0, ""
		# Return instruction length and the disassembled instruction text
		# For now, assume the length is in byte 166
		return inst.xedd[166], inst.buffer.value

def TryOpen(file_name):
	try:
		return open(file_name, "rb")
	except:
		return None

def Is64Bit(f):
	result = sizeof(c_void_p)
	# ELF support only
	pos = f.tell()
	f.seek(0)
	header = f.read(7)
	f.seek(pos)
	magic = header[0:4]
	eclass = ord(header[4])
	encoding = ord(header[5])
	version = ord(header[6])
	if magic == chr(127) + "ELF" and eclass > 0 and eclass < 3 and encoding > 0 and encoding < 3 and version == 1:
		result = True if eclass == 2 else False
	return result

# Global data

class Glb():

	def __init__(self, dbref, db, dbname):
		self.dbref = dbref
		self.db = db
		self.dbname = dbname
		self.home_dir = os.path.expanduser("~")
		self.buildid_dir = os.getenv("PERF_BUILDID_DIR")
		if self.buildid_dir:
			self.buildid_dir += "/.build-id/"
		else:
			self.buildid_dir = self.home_dir + "/.debug/.build-id/"
		self.app = None
		self.mainwindow = None
		self.instances_to_shutdown_on_exit = weakref.WeakSet()
		try:
			self.disassembler = LibXED()
			self.have_disassembler = True
		except:
			self.have_disassembler = False

	def FileFromBuildId(self, build_id):
		file_name = self.buildid_dir + build_id[0:2] + "/" + build_id[2:] + "/elf"
		return TryOpen(file_name)

	def FileFromNamesAndBuildId(self, short_name, long_name, build_id):
		# Assume current machine i.e. no support for virtualization
		if short_name[0:7] == "[kernel" and os.path.basename(long_name) == "kcore":
			file_name = os.getenv("PERF_KCORE")
			f = TryOpen(file_name) if file_name else None
			if f:
				return f
			# For now, no special handling if long_name is /proc/kcore
			f = TryOpen(long_name)
			if f:
				return f
		f = self.FileFromBuildId(build_id)
		if f:
			return f
		return None

	def AddInstanceToShutdownOnExit(self, instance):
		self.instances_to_shutdown_on_exit.add(instance)

	# Shutdown any background processes or threads
	def ShutdownInstances(self):
		for x in self.instances_to_shutdown_on_exit:
			try:
				x.Shutdown()
			except:
				pass

# Database reference

class DBRef():

	def __init__(self, is_sqlite3, dbname):
		self.is_sqlite3 = is_sqlite3
		self.dbname = dbname

	def Open(self, connection_name):
		dbname = self.dbname
		if self.is_sqlite3:
			db = QSqlDatabase.addDatabase("QSQLITE", connection_name)
		else:
			db = QSqlDatabase.addDatabase("QPSQL", connection_name)
			opts = dbname.split()
			for opt in opts:
				if "=" in opt:
					opt = opt.split("=")
					if opt[0] == "hostname":
						db.setHostName(opt[1])
					elif opt[0] == "port":
						db.setPort(int(opt[1]))
					elif opt[0] == "username":
						db.setUserName(opt[1])
					elif opt[0] == "password":
						db.setPassword(opt[1])
					elif opt[0] == "dbname":
						dbname = opt[1]
				else:
					dbname = opt

		db.setDatabaseName(dbname)
		if not db.open():
			raise Exception("Failed to open database " + dbname + " error: " + db.lastError().text())
		return db, dbname

# Main

def Main():
	if (len(sys.argv) < 2):
		printerr("Usage is: exported-sql-viewer.py {<database name> | --help-only}");
		raise Exception("Too few arguments")

	dbname = sys.argv[1]
	if dbname == "--help-only":
		app = QApplication(sys.argv)
		mainwindow = HelpOnlyWindow()
		mainwindow.show()
		err = app.exec_()
		sys.exit(err)

	is_sqlite3 = False
	try:
		f = open(dbname, "rb")
		if f.read(15) == b'SQLite format 3':
			is_sqlite3 = True
		f.close()
	except:
		pass

	dbref = DBRef(is_sqlite3, dbname)
	db, dbname = dbref.Open("main")
	glb = Glb(dbref, db, dbname)
	app = QApplication(sys.argv)
	glb.app = app
	mainwindow = MainWindow(glb)
	glb.mainwindow = mainwindow
	mainwindow.show()
	err = app.exec_()
	glb.ShutdownInstances()
	db.close()
	sys.exit(err)

if __name__ == "__main__":
	Main()