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 #!/usr/bin/env python
 # 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
 # Only change warnings if the python -W option was not used
 if not sys.warnoptions:
     import warnings
     # PySide2 causes deprecation warnings, ignore them.
     warnings.filterwarnings("ignore", category=DeprecationWarning)
 import argparse
 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
 import random
 import copy
 import math
 from libxed import LibXED
 
 pyside_version_1 = True
 if not "--pyside-version-1" in sys.argv:
     try:
         from PySide2.QtCore import *
         from PySide2.QtGui import *
         from PySide2.QtSql import *
         from PySide2.QtWidgets import *
         pyside_version_1 = False
     except:
         pass
 
 if pyside_version_1:
     from PySide.QtCore import *
     from PySide.QtGui import *
     from PySide.QtSql import *
 
 from decimal import Decimal, ROUND_HALF_UP
 from ctypes import CDLL, Structure, create_string_buffer, addressof, sizeof, \
            c_void_p, c_bool, c_byte, c_char, c_int, c_uint, c_longlong, c_ulonglong
 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, params, parent=None):
         super(TreeModel, self).__init__(parent)
         self.glb = glb
         self.params = params
         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
 
 def LookupModel(model_name):
     model_cache_lock.acquire()
     try:
         model = model_cache[model_name]
     except:
         model = None
     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.lineEdit().selectAll()
         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, params, row, parent_item):
         self.glb = glb
         self.params = params
         self.row = row
         self.parent_item = parent_item
         self.query_done = False
         self.child_count = 0
         self.child_items = []
         if parent_item:
             self.level = parent_item.level + 1
         else:
             self.level = 0
 
     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, params, row, comm_id, thread_id, call_path_id, time, insn_cnt, cyc_cnt, branch_count, parent_item):
         super(CallGraphLevelTwoPlusItemBase, self).__init__(glb, params, row, parent_item)
         self.comm_id = comm_id
         self.thread_id = thread_id
         self.call_path_id = call_path_id
         self.insn_cnt = insn_cnt
         self.cyc_cnt = cyc_cnt
         self.branch_count = branch_count
         self.time = time
 
     def Select(self):
         self.query_done = True
         query = QSqlQuery(self.glb.db)
         if self.params.have_ipc:
             ipc_str = ", SUM(insn_count), SUM(cyc_count)"
         else:
             ipc_str = ""
         QueryExec(query, "SELECT call_path_id, name, short_name, COUNT(calls.id), SUM(return_time - call_time)" + ipc_str + ", 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():
             if self.params.have_ipc:
                 insn_cnt = int(query.value(5))
                 cyc_cnt = int(query.value(6))
                 branch_count = int(query.value(7))
             else:
                 insn_cnt = 0
                 cyc_cnt = 0
                 branch_count = int(query.value(5))
             child_item = CallGraphLevelThreeItem(self.glb, self.params, 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)), insn_cnt, cyc_cnt, branch_count, 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, params, row, comm_id, thread_id, call_path_id, name, dso, count, time, insn_cnt, cyc_cnt, branch_count, parent_item):
         super(CallGraphLevelThreeItem, self).__init__(glb, params, row, comm_id, thread_id, call_path_id, time, insn_cnt, cyc_cnt, branch_count, parent_item)
         dso = dsoname(dso)
         if self.params.have_ipc:
             insn_pcnt = PercentToOneDP(insn_cnt, parent_item.insn_cnt)
             cyc_pcnt = PercentToOneDP(cyc_cnt, parent_item.cyc_cnt)
             br_pcnt = PercentToOneDP(branch_count, parent_item.branch_count)
             ipc = CalcIPC(cyc_cnt, insn_cnt)
             self.data = [ name, dso, str(count), str(time), PercentToOneDP(time, parent_item.time), str(insn_cnt), insn_pcnt, str(cyc_cnt), cyc_pcnt, ipc, str(branch_count), br_pcnt ]
         else:
             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, params, row, comm_id, thread_id, pid, tid, parent_item):
         super(CallGraphLevelTwoItem, self).__init__(glb, params, row, comm_id, thread_id, 1, 0, 0, 0, 0, parent_item)
         if self.params.have_ipc:
             self.data = [str(pid) + ":" + str(tid), "", "", "", "", "", "", "", "", "", "", ""]
         else:
             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.insn_cnt += child_item.insn_cnt
             self.cyc_cnt += child_item.cyc_cnt
             self.branch_count += child_item.branch_count
         for child_item in self.child_items:
             child_item.data[4] = PercentToOneDP(child_item.time, self.time)
             if self.params.have_ipc:
                 child_item.data[6] = PercentToOneDP(child_item.insn_cnt, self.insn_cnt)
                 child_item.data[8] = PercentToOneDP(child_item.cyc_cnt, self.cyc_cnt)
                 child_item.data[11] = PercentToOneDP(child_item.branch_count, self.branch_count)
             else:
                 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, params, row, comm_id, comm, parent_item):
         super(CallGraphLevelOneItem, self).__init__(glb, params, row, parent_item)
         if self.params.have_ipc:
             self.data = [comm, "", "", "", "", "", "", "", "", "", "", ""]
         else:
             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.params, 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, params):
         super(CallGraphRootItem, self).__init__(glb, params, 0, None)
         self.dbid = 0
         self.query_done = True
         if_has_calls = ""
         if IsSelectable(glb.db, "comms", columns = "has_calls"):
             if_has_calls = " WHERE has_calls = " + glb.dbref.TRUE
         query = QSqlQuery(glb.db)
         QueryExec(query, "SELECT id, comm FROM comms" + if_has_calls)
         while query.next():
             if not query.value(0):
                 continue
             child_item = CallGraphLevelOneItem(glb, params, self.child_count, query.value(0), query.value(1), self)
             self.child_items.append(child_item)
             self.child_count += 1
 
 # Call graph model parameters
 
 class CallGraphModelParams():
 
     def __init__(self, glb, parent=None):
         self.have_ipc = IsSelectable(glb.db, "calls", columns = "insn_count, cyc_count")
 
 # Context-sensitive call graph data model base
 
 class CallGraphModelBase(TreeModel):
 
     def __init__(self, glb, parent=None):
         super(CallGraphModelBase, self).__init__(glb, CallGraphModelParams(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, self.params)
 
     def columnCount(self, parent=None):
         if self.params.have_ipc:
             return 12
         else:
             return 7
 
     def columnHeader(self, column):
         if self.params.have_ipc:
             headers = ["Call Path", "Object", "Count ", "Time (ns) ", "Time (%) ", "Insn Cnt", "Insn Cnt (%)", "Cyc Cnt", "Cyc Cnt (%)", "IPC", "Branch Count ", "Branch Count (%) "]
         else:
             headers = ["Call Path", "Object", "Count ", "Time (ns) ", "Time (%) ", "Branch Count ", "Branch Count (%) "]
         return headers[column]
 
     def columnAlignment(self, column):
         if self.params.have_ipc:
             alignment = [ Qt.AlignLeft, Qt.AlignLeft, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight ]
         else:
             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 calls.id <> 0"
                         " AND 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, params, row, comm_id, thread_id, calls_id, call_time, time, insn_cnt, cyc_cnt, branch_count, parent_item):
         super(CallTreeLevelTwoPlusItemBase, self).__init__(glb, params, row, parent_item)
         self.comm_id = comm_id
         self.thread_id = thread_id
         self.calls_id = calls_id
         self.call_time = call_time
         self.time = time
         self.insn_cnt = insn_cnt
         self.cyc_cnt = cyc_cnt
         self.branch_count = branch_count
 
     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 = ""
         if self.params.have_ipc:
             ipc_str = ", insn_count, cyc_count"
         else:
             ipc_str = ""
         query = QSqlQuery(self.glb.db)
         QueryExec(query, "SELECT calls.id, name, short_name, call_time, return_time - call_time" + ipc_str + ", 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():
             if self.params.have_ipc:
                 insn_cnt = int(query.value(5))
                 cyc_cnt = int(query.value(6))
                 branch_count = int(query.value(7))
             else:
                 insn_cnt = 0
                 cyc_cnt = 0
                 branch_count = int(query.value(5))
             child_item = CallTreeLevelThreeItem(self.glb, self.params, 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)), insn_cnt, cyc_cnt, branch_count, 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, params, row, comm_id, thread_id, calls_id, name, dso, call_time, time, insn_cnt, cyc_cnt, branch_count, parent_item):
         super(CallTreeLevelThreeItem, self).__init__(glb, params, row, comm_id, thread_id, calls_id, call_time, time, insn_cnt, cyc_cnt, branch_count, parent_item)
         dso = dsoname(dso)
         if self.params.have_ipc:
             insn_pcnt = PercentToOneDP(insn_cnt, parent_item.insn_cnt)
             cyc_pcnt = PercentToOneDP(cyc_cnt, parent_item.cyc_cnt)
             br_pcnt = PercentToOneDP(branch_count, parent_item.branch_count)
             ipc = CalcIPC(cyc_cnt, insn_cnt)
             self.data = [ name, dso, str(call_time), str(time), PercentToOneDP(time, parent_item.time), str(insn_cnt), insn_pcnt, str(cyc_cnt), cyc_pcnt, ipc, str(branch_count), br_pcnt ]
         else:
             self.data = [ name, dso, str(call_time), 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, params, row, comm_id, thread_id, pid, tid, parent_item):
         super(CallTreeLevelTwoItem, self).__init__(glb, params, row, comm_id, thread_id, 0, 0, 0, 0, 0, 0, parent_item)
         if self.params.have_ipc:
             self.data = [str(pid) + ":" + str(tid), "", "", "", "", "", "", "", "", "", "", ""]
         else:
             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.insn_cnt += child_item.insn_cnt
             self.cyc_cnt += child_item.cyc_cnt
             self.branch_count += child_item.branch_count
         for child_item in self.child_items:
             child_item.data[4] = PercentToOneDP(child_item.time, self.time)
             if self.params.have_ipc:
                 child_item.data[6] = PercentToOneDP(child_item.insn_cnt, self.insn_cnt)
                 child_item.data[8] = PercentToOneDP(child_item.cyc_cnt, self.cyc_cnt)
                 child_item.data[11] = PercentToOneDP(child_item.branch_count, self.branch_count)
             else:
                 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, params, row, comm_id, comm, parent_item):
         super(CallTreeLevelOneItem, self).__init__(glb, params, row, parent_item)
         if self.params.have_ipc:
             self.data = [comm, "", "", "", "", "", "", "", "", "", "", ""]
         else:
             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.params, 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, params):
         super(CallTreeRootItem, self).__init__(glb, params, 0, None)
         self.dbid = 0
         self.query_done = True
         if_has_calls = ""
         if IsSelectable(glb.db, "comms", columns = "has_calls"):
             if_has_calls = " WHERE has_calls = " + glb.dbref.TRUE
         query = QSqlQuery(glb.db)
         QueryExec(query, "SELECT id, comm FROM comms" + if_has_calls)
         while query.next():
             if not query.value(0):
                 continue
             child_item = CallTreeLevelOneItem(glb, params, 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, self.params)
 
     def columnCount(self, parent=None):
         if self.params.have_ipc:
             return 12
         else:
             return 7
 
     def columnHeader(self, column):
         if self.params.have_ipc:
             headers = ["Call Path", "Object", "Call Time", "Time (ns) ", "Time (%) ", "Insn Cnt", "Insn Cnt (%)", "Cyc Cnt", "Cyc Cnt (%)", "IPC", "Branch Count ", "Branch Count (%) "]
         else:
             headers = ["Call Path", "Object", "Call Time", "Time (ns) ", "Time (%) ", "Branch Count ", "Branch Count (%) "]
         return headers[column]
 
     def columnAlignment(self, column):
         if self.params.have_ipc:
             alignment = [ Qt.AlignLeft, Qt.AlignLeft, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight, Qt.AlignRight ]
         else:
             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 calls.id <> 0"
                         " AND 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 layout
 
 class HBoxLayout(QHBoxLayout):
 
     def __init__(self, *children):
         super(HBoxLayout, self).__init__()
 
         self.layout().setContentsMargins(0, 0, 0, 0)
         for child in children:
             if child.isWidgetType():
                 self.layout().addWidget(child)
             else:
                 self.layout().addLayout(child)
 
 # Horizontal layout
 
 class VBoxLayout(QVBoxLayout):
 
     def __init__(self, *children):
         super(VBoxLayout, self).__init__()
 
         self.layout().setContentsMargins(0, 0, 0, 0)
         for child in children:
             if child.isWidgetType():
                 self.layout().addWidget(child)
             else:
                 self.layout().addLayout(child)
 
 # Vertical layout widget
 
 class VBox():
 
     def __init__(self, *children):
         self.vbox = QWidget()
         self.vbox.setLayout(VBoxLayout(*children))
 
     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.find_bar = None
 
         self.view = QTreeView()
         self.view.setSelectionMode(QAbstractItemView.ContiguousSelection)
         self.view.CopyCellsToClipboard = CopyTreeCellsToClipboard
 
         self.context_menu = TreeContextMenu(self.view)
 
     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.setExpanded(parent, 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.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, thread_at_time=None):
         super(CallTreeWindow, self).__init__(parent)
 
         self.model = LookupCreateModel("Call Tree", lambda x=glb: CallTreeModel(x))
 
         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")
 
         if thread_at_time:
             self.DisplayThreadAtTime(*thread_at_time)
 
     def DisplayThreadAtTime(self, comm_id, thread_id, time):
         parent = QModelIndex()
         for dbid in (comm_id, thread_id):
             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.setExpanded(parent, True)
                     self.view.setCurrentIndex(child)
                     parent = child
                     break
             if not found:
                 return
         found = False
         while True:
             n = self.model.rowCount(parent)
             if not n:
                 return
             last_child = None
             for row in xrange(n):
                 self.view.setExpanded(parent, True)
                 child = self.model.index(row, 0, parent)
                 child_call_time = child.internalPointer().call_time
                 if child_call_time < time:
                     last_child = child
                 elif child_call_time == time:
                     self.view.setCurrentIndex(child)
                     return
                 elif child_call_time > time:
                     break
             if not last_child:
                 if not found:
                     child = self.model.index(0, 0, parent)
                     self.view.setExpanded(parent, True)
                     self.view.setCurrentIndex(child)
                 return
             found = True
             self.view.setExpanded(parent, True)
             self.view.setCurrentIndex(last_child)
             parent = last_child
 
 # ExecComm() gets the comm_id of the command string that was set when the process exec'd i.e. the program name
 
 def ExecComm(db, thread_id, time):
     query = QSqlQuery(db)
     QueryExec(query, "SELECT comm_threads.comm_id, comms.c_time, comms.exec_flag"
                 " FROM comm_threads"
                 " INNER JOIN comms ON comms.id = comm_threads.comm_id"
                 " WHERE comm_threads.thread_id = " + str(thread_id) +
                 " ORDER BY comms.c_time, comms.id")
     first = None
     last = None
     while query.next():
         if first is None:
             first = query.value(0)
         if query.value(2) and Decimal(query.value(1)) <= Decimal(time):
             last = query.value(0)
     if not(last is None):
         return last
     return first
 
 # Container for (x, y) data
 
 class XY():
     def __init__(self, x=0, y=0):
         self.x = x
         self.y = y
 
     def __str__(self):
         return "XY({}, {})".format(str(self.x), str(self.y))
 
 # Container for sub-range data
 
 class Subrange():
     def __init__(self, lo=0, hi=0):
         self.lo = lo
         self.hi = hi
 
     def __str__(self):
         return "Subrange({}, {})".format(str(self.lo), str(self.hi))
 
 # Graph data region base class
 
 class GraphDataRegion(object):
 
     def __init__(self, key, title = "", ordinal = ""):
         self.key = key
         self.title = title
         self.ordinal = ordinal
 
 # Function to sort GraphDataRegion
 
 def GraphDataRegionOrdinal(data_region):
     return data_region.ordinal
 
 # Attributes for a graph region
 
 class GraphRegionAttribute():
 
     def __init__(self, colour):
         self.colour = colour
 
 # Switch graph data region represents a task
 
 class SwitchGraphDataRegion(GraphDataRegion):
 
     def __init__(self, key, exec_comm_id, pid, tid, comm, thread_id, comm_id):
         super(SwitchGraphDataRegion, self).__init__(key)
 
         self.title = str(pid) + " / " + str(tid) + " " + comm
         # Order graph legend within exec comm by pid / tid / time
         self.ordinal = str(pid).rjust(16) + str(exec_comm_id).rjust(8) + str(tid).rjust(16)
         self.exec_comm_id = exec_comm_id
         self.pid = pid
         self.tid = tid
         self.comm = comm
         self.thread_id = thread_id
         self.comm_id = comm_id
 
 # Graph data point
 
 class GraphDataPoint():
 
     def __init__(self, data, index, x, y, altx=None, alty=None, hregion=None, vregion=None):
         self.data = data
         self.index = index
         self.x = x
         self.y = y
         self.altx = altx
         self.alty = alty
         self.hregion = hregion
         self.vregion = vregion
 
 # Graph data (single graph) base class
 
 class GraphData(object):
 
     def __init__(self, collection, xbase=Decimal(0), ybase=Decimal(0)):
         self.collection = collection
         self.points = []
         self.xbase = xbase
         self.ybase = ybase
         self.title = ""
 
     def AddPoint(self, x, y, altx=None, alty=None, hregion=None, vregion=None):
         index = len(self.points)
 
         x = float(Decimal(x) - self.xbase)
         y = float(Decimal(y) - self.ybase)
 
         self.points.append(GraphDataPoint(self, index, x, y, altx, alty, hregion, vregion))
 
     def XToData(self, x):
         return Decimal(x) + self.xbase
 
     def YToData(self, y):
         return Decimal(y) + self.ybase
 
 # Switch graph data (for one CPU)
 
 class SwitchGraphData(GraphData):
 
     def __init__(self, db, collection, cpu, xbase):
         super(SwitchGraphData, self).__init__(collection, xbase)
 
         self.cpu = cpu
         self.title = "CPU " + str(cpu)
         self.SelectSwitches(db)
 
     def SelectComms(self, db, thread_id, last_comm_id, start_time, end_time):
         query = QSqlQuery(db)
         QueryExec(query, "SELECT id, c_time"
                     " FROM comms"
                     " WHERE c_thread_id = " + str(thread_id) +
                     "   AND exec_flag = " + self.collection.glb.dbref.TRUE +
                     "   AND c_time >= " + str(start_time) +
                     "   AND c_time <= " + str(end_time) +
                     " ORDER BY c_time, id")
         while query.next():
             comm_id = query.value(0)
             if comm_id == last_comm_id:
                 continue
             time = query.value(1)
             hregion = self.HRegion(db, thread_id, comm_id, time)
             self.AddPoint(time, 1000, None, None, hregion)
 
     def SelectSwitches(self, db):
         last_time = None
         last_comm_id = None
         last_thread_id = None
         query = QSqlQuery(db)
         QueryExec(query, "SELECT time, thread_out_id, thread_in_id, comm_out_id, comm_in_id, flags"
                     " FROM context_switches"
                     " WHERE machine_id = " + str(self.collection.machine_id) +
                     "   AND cpu = " + str(self.cpu) +
                     " ORDER BY time, id")
         while query.next():
             flags = int(query.value(5))
             if flags & 1:
                 # Schedule-out: detect and add exec's
                 if last_thread_id == query.value(1) and last_comm_id is not None and last_comm_id != query.value(3):
                     self.SelectComms(db, last_thread_id, last_comm_id, last_time, query.value(0))
                 continue
             # Schedule-in: add data point
             if len(self.points) == 0:
                 start_time = self.collection.glb.StartTime(self.collection.machine_id)
                 hregion = self.HRegion(db, query.value(1), query.value(3), start_time)
                 self.AddPoint(start_time, 1000, None, None, hregion)
             time = query.value(0)
             comm_id = query.value(4)
             thread_id = query.value(2)
             hregion = self.HRegion(db, thread_id, comm_id, time)
             self.AddPoint(time, 1000, None, None, hregion)
             last_time = time
             last_comm_id = comm_id
             last_thread_id = thread_id
 
     def NewHRegion(self, db, key, thread_id, comm_id, time):
         exec_comm_id = ExecComm(db, thread_id, time)
         query = QSqlQuery(db)
         QueryExec(query, "SELECT pid, tid FROM threads WHERE id = " + str(thread_id))
         if query.next():
             pid = query.value(0)
             tid = query.value(1)
         else:
             pid = -1
             tid = -1
         query = QSqlQuery(db)
         QueryExec(query, "SELECT comm FROM comms WHERE id = " + str(comm_id))
         if query.next():
             comm = query.value(0)
         else:
             comm = ""
         return SwitchGraphDataRegion(key, exec_comm_id, pid, tid, comm, thread_id, comm_id)
 
     def HRegion(self, db, thread_id, comm_id, time):
         key = str(thread_id) + ":" + str(comm_id)
         hregion = self.collection.LookupHRegion(key)
         if hregion is None:
             hregion = self.NewHRegion(db, key, thread_id, comm_id, time)
             self.collection.AddHRegion(key, hregion)
         return hregion
 
 # Graph data collection (multiple related graphs) base class
 
 class GraphDataCollection(object):
 
     def __init__(self, glb):
         self.glb = glb
         self.data = []
         self.hregions = {}
         self.xrangelo = None
         self.xrangehi = None
         self.yrangelo = None
         self.yrangehi = None
         self.dp = XY(0, 0)
 
     def AddGraphData(self, data):
         self.data.append(data)
 
     def LookupHRegion(self, key):
         if key in self.hregions:
             return self.hregions[key]
         return None
 
     def AddHRegion(self, key, hregion):
         self.hregions[key] = hregion
 
 # Switch graph data collection (SwitchGraphData for each CPU)
 
 class SwitchGraphDataCollection(GraphDataCollection):
 
     def __init__(self, glb, db, machine_id):
         super(SwitchGraphDataCollection, self).__init__(glb)
 
         self.machine_id = machine_id
         self.cpus = self.SelectCPUs(db)
 
         self.xrangelo = glb.StartTime(machine_id)
         self.xrangehi = glb.FinishTime(machine_id)
 
         self.yrangelo = Decimal(0)
         self.yrangehi = Decimal(1000)
 
         for cpu in self.cpus:
             self.AddGraphData(SwitchGraphData(db, self, cpu, self.xrangelo))
 
     def SelectCPUs(self, db):
         cpus = []
         query = QSqlQuery(db)
         QueryExec(query, "SELECT DISTINCT cpu"
                     " FROM context_switches"
                     " WHERE machine_id = " + str(self.machine_id))
         while query.next():
             cpus.append(int(query.value(0)))
         return sorted(cpus)
 
 # Switch graph data graphics item displays the graphed data
 
 class SwitchGraphDataGraphicsItem(QGraphicsItem):
 
     def __init__(self, data, graph_width, graph_height, attrs, event_handler, parent=None):
         super(SwitchGraphDataGraphicsItem, self).__init__(parent)
 
         self.data = data
         self.graph_width = graph_width
         self.graph_height = graph_height
         self.attrs = attrs
         self.event_handler = event_handler
         self.setAcceptHoverEvents(True)
 
     def boundingRect(self):
         return QRectF(0, 0, self.graph_width, self.graph_height)
 
     def PaintPoint(self, painter, last, x):
         if not(last is None or last.hregion.pid == 0 or x < self.attrs.subrange.x.lo):
             if last.x < self.attrs.subrange.x.lo:
                 x0 = self.attrs.subrange.x.lo
             else:
                 x0 = last.x
             if x > self.attrs.subrange.x.hi:
                 x1 = self.attrs.subrange.x.hi
             else:
                 x1 = x - 1
             x0 = self.attrs.XToPixel(x0)
             x1 = self.attrs.XToPixel(x1)
 
             y0 = self.attrs.YToPixel(last.y)
 
             colour = self.attrs.region_attributes[last.hregion.key].colour
 
             width = x1 - x0 + 1
             if width < 2:
                 painter.setPen(colour)
                 painter.drawLine(x0, self.graph_height - y0, x0, self.graph_height)
             else:
                 painter.fillRect(x0, self.graph_height - y0, width, self.graph_height - 1, colour)
 
     def paint(self, painter, option, widget):
         last = None
         for point in self.data.points:
             self.PaintPoint(painter, last, point.x)
             if point.x > self.attrs.subrange.x.hi:
                 break;
             last = point
         self.PaintPoint(painter, last, self.attrs.subrange.x.hi + 1)
 
     def BinarySearchPoint(self, target):
         lower_pos = 0
         higher_pos = len(self.data.points)
         while True:
             pos = int((lower_pos + higher_pos) / 2)
             val = self.data.points[pos].x
             if target >= val:
                 lower_pos = pos
             else:
                 higher_pos = pos
             if higher_pos <= lower_pos + 1:
                 return lower_pos
 
     def XPixelToData(self, x):
         x = self.attrs.PixelToX(x)
         if x < self.data.points[0].x:
             x = 0
             pos = 0
             low = True
         else:
             pos = self.BinarySearchPoint(x)
             low = False
         return (low, pos, self.data.XToData(x))
 
     def EventToData(self, event):
         no_data = (None,) * 4
         if len(self.data.points) < 1:
             return no_data
         x = event.pos().x()
         if x < 0:
             return no_data
         low0, pos0, time_from = self.XPixelToData(x)
         low1, pos1, time_to = self.XPixelToData(x + 1)
         hregions = set()
         hregion_times = []
         if not low1:
             for i in xrange(pos0, pos1 + 1):
                 hregion = self.data.points[i].hregion
                 hregions.add(hregion)
                 if i == pos0:
                     time = time_from
                 else:
                     time = self.data.XToData(self.data.points[i].x)
                 hregion_times.append((hregion, time))
         return (time_from, time_to, hregions, hregion_times)
 
     def hoverMoveEvent(self, event):
         time_from, time_to, hregions, hregion_times = self.EventToData(event)
         if time_from is not None:
             self.event_handler.PointEvent(self.data.cpu, time_from, time_to, hregions)
 
     def hoverLeaveEvent(self, event):
         self.event_handler.NoPointEvent()
 
     def mousePressEvent(self, event):
         if event.button() != Qt.RightButton:
             super(SwitchGraphDataGraphicsItem, self).mousePressEvent(event)
             return
         time_from, time_to, hregions, hregion_times = self.EventToData(event)
         if hregion_times:
             self.event_handler.RightClickEvent(self.data.cpu, hregion_times, event.screenPos())
 
 # X-axis graphics item
 
 class XAxisGraphicsItem(QGraphicsItem):
 
     def __init__(self, width, parent=None):
         super(XAxisGraphicsItem, self).__init__(parent)
 
         self.width = width
         self.max_mark_sz = 4
         self.height = self.max_mark_sz + 1
 
     def boundingRect(self):
         return QRectF(0, 0, self.width, self.height)
 
     def Step(self):
         attrs = self.parentItem().attrs
         subrange = attrs.subrange.x
         t = subrange.hi - subrange.lo
         s = (3.0 * t) / self.width
         n = 1.0
         while s > n:
             n = n * 10.0
         return n
 
     def PaintMarks(self, painter, at_y, lo, hi, step, i):
         attrs = self.parentItem().attrs
         x = lo
         while x <= hi:
             xp = attrs.XToPixel(x)
             if i % 10:
                 if i % 5:
                     sz = 1
                 else:
                     sz = 2
             else:
                 sz = self.max_mark_sz
                 i = 0
             painter.drawLine(xp, at_y, xp, at_y + sz)
             x += step
             i += 1
 
     def paint(self, painter, option, widget):
         # Using QPainter::drawLine(int x1, int y1, int x2, int y2) so x2 = width -1
         painter.drawLine(0, 0, self.width - 1, 0)
         n = self.Step()
         attrs = self.parentItem().attrs
         subrange = attrs.subrange.x
         if subrange.lo:
             x_offset = n - (subrange.lo % n)
         else:
             x_offset = 0.0
         x = subrange.lo + x_offset
         i = (x / n) % 10
         self.PaintMarks(painter, 0, x, subrange.hi, n, i)
 
     def ScaleDimensions(self):
         n = self.Step()
         attrs = self.parentItem().attrs
         lo = attrs.subrange.x.lo
         hi = (n * 10.0) + lo
         width = attrs.XToPixel(hi)
         if width > 500:
             width = 0
         return (n, lo, hi, width)
 
     def PaintScale(self, painter, at_x, at_y):
         n, lo, hi, width = self.ScaleDimensions()
         if not width:
             return
         painter.drawLine(at_x, at_y, at_x + width, at_y)
         self.PaintMarks(painter, at_y, lo, hi, n, 0)
 
     def ScaleWidth(self):
         n, lo, hi, width = self.ScaleDimensions()
         return width
 
     def ScaleHeight(self):
         return self.height
 
     def ScaleUnit(self):
         return self.Step() * 10
 
 # Scale graphics item base class
 
 class ScaleGraphicsItem(QGraphicsItem):
 
     def __init__(self, axis, parent=None):
         super(ScaleGraphicsItem, self).__init__(parent)
         self.axis = axis
 
     def boundingRect(self):
         scale_width = self.axis.ScaleWidth()
         if not scale_width:
             return QRectF()
         return QRectF(0, 0, self.axis.ScaleWidth() + 100, self.axis.ScaleHeight())
 
     def paint(self, painter, option, widget):
         scale_width = self.axis.ScaleWidth()
         if not scale_width:
             return
         self.axis.PaintScale(painter, 0, 5)
         x = scale_width + 4
         painter.drawText(QPointF(x, 10), self.Text())
 
     def Unit(self):
         return self.axis.ScaleUnit()
 
     def Text(self):
         return ""
 
 # Switch graph scale graphics item
 
 class SwitchScaleGraphicsItem(ScaleGraphicsItem):
 
     def __init__(self, axis, parent=None):
         super(SwitchScaleGraphicsItem, self).__init__(axis, parent)
 
     def Text(self):
         unit = self.Unit()
         if unit >= 1000000000:
             unit = int(unit / 1000000000)
             us = "s"
         elif unit >= 1000000:
             unit = int(unit / 1000000)
             us = "ms"
         elif unit >= 1000:
             unit = int(unit / 1000)
             us = "us"
         else:
             unit = int(unit)
             us = "ns"
         return " = " + str(unit) + " " + us
 
 # Switch graph graphics item contains graph title, scale, x/y-axis, and the graphed data
 
 class SwitchGraphGraphicsItem(QGraphicsItem):
 
     def __init__(self, collection, data, attrs, event_handler, first, parent=None):
         super(SwitchGraphGraphicsItem, self).__init__(parent)
         self.collection = collection
         self.data = data
         self.attrs = attrs
         self.event_handler = event_handler
 
         margin = 20
         title_width = 50
 
         self.title_graphics = QGraphicsSimpleTextItem(data.title, self)
 
         self.title_graphics.setPos(margin, margin)
         graph_width = attrs.XToPixel(attrs.subrange.x.hi) + 1
         graph_height = attrs.YToPixel(attrs.subrange.y.hi) + 1
 
         self.graph_origin_x = margin + title_width + margin
         self.graph_origin_y = graph_height + margin
 
         x_axis_size = 1
         y_axis_size = 1
         self.yline = QGraphicsLineItem(0, 0, 0, graph_height, self)
 
         self.x_axis = XAxisGraphicsItem(graph_width, self)
         self.x_axis.setPos(self.graph_origin_x, self.graph_origin_y + 1)
 
         if first:
             self.scale_item = SwitchScaleGraphicsItem(self.x_axis, self)
             self.scale_item.setPos(self.graph_origin_x, self.graph_origin_y + 10)
 
         self.yline.setPos(self.graph_origin_x - y_axis_size, self.graph_origin_y - graph_height)
 
         self.axis_point = QGraphicsLineItem(0, 0, 0, 0, self)
         self.axis_point.setPos(self.graph_origin_x - 1, self.graph_origin_y +1)
 
         self.width = self.graph_origin_x + graph_width + margin
         self.height = self.graph_origin_y + margin
 
         self.graph = SwitchGraphDataGraphicsItem(data, graph_width, graph_height, attrs, event_handler, self)
         self.graph.setPos(self.graph_origin_x, self.graph_origin_y - graph_height)
 
         if parent and 'EnableRubberBand' in dir(parent):
             parent.EnableRubberBand(self.graph_origin_x, self.graph_origin_x + graph_width - 1, self)
 
     def boundingRect(self):
         return QRectF(0, 0, self.width, self.height)
 
     def paint(self, painter, option, widget):
         pass
 
     def RBXToPixel(self, x):
         return self.attrs.PixelToX(x - self.graph_origin_x)
 
     def RBXRangeToPixel(self, x0, x1):
         return (self.RBXToPixel(x0), self.RBXToPixel(x1 + 1))
 
     def RBPixelToTime(self, x):
         if x < self.data.points[0].x:
             return self.data.XToData(0)
         return self.data.XToData(x)
 
     def RBEventTimes(self, x0, x1):
         x0, x1 = self.RBXRangeToPixel(x0, x1)
         time_from = self.RBPixelToTime(x0)
         time_to = self.RBPixelToTime(x1)
         return (time_from, time_to)
 
     def RBEvent(self, x0, x1):
         time_from, time_to = self.RBEventTimes(x0, x1)
         self.event_handler.RangeEvent(time_from, time_to)
 
     def RBMoveEvent(self, x0, x1):
         if x1 < x0:
             x0, x1 = x1, x0
         self.RBEvent(x0, x1)
 
     def RBReleaseEvent(self, x0, x1, selection_state):
         if x1 < x0:
             x0, x1 = x1, x0
         x0, x1 = self.RBXRangeToPixel(x0, x1)
         self.event_handler.SelectEvent(x0, x1, selection_state)
 
 # Graphics item to draw a vertical bracket (used to highlight "forward" sub-range)
 
 class VerticalBracketGraphicsItem(QGraphicsItem):
 
     def __init__(self, parent=None):
         super(VerticalBracketGraphicsItem, self).__init__(parent)
 
         self.width = 0
         self.height = 0
         self.hide()
 
     def SetSize(self, width, height):
         self.width = width + 1
         self.height = height + 1
 
     def boundingRect(self):
         return QRectF(0, 0, self.width, self.height)
 
     def paint(self, painter, option, widget):
         colour = QColor(255, 255, 0, 32)
         painter.fillRect(0, 0, self.width, self.height, colour)
         x1 = self.width - 1
         y1 = self.height - 1
         painter.drawLine(0, 0, x1, 0)
         painter.drawLine(0, 0, 0, 3)
         painter.drawLine(x1, 0, x1, 3)
         painter.drawLine(0, y1, x1, y1)
         painter.drawLine(0, y1, 0, y1 - 3)
         painter.drawLine(x1, y1, x1, y1 - 3)
 
 # Graphics item to contain graphs arranged vertically
 
 class VertcalGraphSetGraphicsItem(QGraphicsItem):
 
     def __init__(self, collection, attrs, event_handler, child_class, parent=None):
         super(VertcalGraphSetGraphicsItem, self).__init__(parent)
 
         self.collection = collection
 
         self.top = 10
 
         self.width = 0
         self.height = self.top
 
         self.rubber_band = None
         self.rb_enabled = False
 
         first = True
         for data in collection.data:
             child = child_class(collection, data, attrs, event_handler, first, self)
             child.setPos(0, self.height + 1)
             rect = child.boundingRect()
             if rect.right() > self.width:
                 self.width = rect.right()
             self.height = self.height + rect.bottom() + 1
             first = False
 
         self.bracket = VerticalBracketGraphicsItem(self)
 
     def EnableRubberBand(self, xlo, xhi, rb_event_handler):
         if self.rb_enabled:
             return
         self.rb_enabled = True
         self.rb_in_view = False
         self.setAcceptedMouseButtons(Qt.LeftButton)
         self.rb_xlo = xlo
         self.rb_xhi = xhi
         self.rb_event_handler = rb_event_handler
         self.mousePressEvent = self.MousePressEvent
         self.mouseMoveEvent = self.MouseMoveEvent
         self.mouseReleaseEvent = self.MouseReleaseEvent
 
     def boundingRect(self):
         return QRectF(0, 0, self.width, self.height)
 
     def paint(self, painter, option, widget):
         pass
 
     def RubberBandParent(self):
         scene = self.scene()
         view = scene.views()[0]
         viewport = view.viewport()
         return viewport
 
     def RubberBandSetGeometry(self, rect):
         scene_rectf = self.mapRectToScene(QRectF(rect))
         scene = self.scene()
         view = scene.views()[0]
         poly = view.mapFromScene(scene_rectf)
         self.rubber_band.setGeometry(poly.boundingRect())
 
     def SetSelection(self, selection_state):
         if self.rubber_band:
             if selection_state:
                 self.RubberBandSetGeometry(selection_state)
                 self.rubber_band.show()
             else:
                 self.rubber_band.hide()
 
     def SetBracket(self, rect):
         if rect:
             x, y, width, height = rect.x(), rect.y(), rect.width(), rect.height()
             self.bracket.setPos(x, y)
             self.bracket.SetSize(width, height)
             self.bracket.show()
         else:
             self.bracket.hide()
 
     def RubberBandX(self, event):
         x = event.pos().toPoint().x()
         if x < self.rb_xlo:
             x = self.rb_xlo
         elif x > self.rb_xhi:
             x = self.rb_xhi
         else:
             self.rb_in_view = True
         return x
 
     def RubberBandRect(self, x):
         if self.rb_origin.x() <= x:
             width = x - self.rb_origin.x()
             rect = QRect(self.rb_origin, QSize(width, self.height))
         else:
             width = self.rb_origin.x() - x
             top_left = QPoint(self.rb_origin.x() - width, self.rb_origin.y())
             rect = QRect(top_left, QSize(width, self.height))
         return rect
 
     def MousePressEvent(self, event):
         self.rb_in_view = False
         x = self.RubberBandX(event)
         self.rb_origin = QPoint(x, self.top)
         if self.rubber_band is None:
             self.rubber_band = QRubberBand(QRubberBand.Rectangle, self.RubberBandParent())
         self.RubberBandSetGeometry(QRect(self.rb_origin, QSize(0, self.height)))
         if self.rb_in_view:
             self.rubber_band.show()
             self.rb_event_handler.RBMoveEvent(x, x)
         else:
             self.rubber_band.hide()
 
     def MouseMoveEvent(self, event):
         x = self.RubberBandX(event)
         rect = self.RubberBandRect(x)
         self.RubberBandSetGeometry(rect)
         if self.rb_in_view:
             self.rubber_band.show()
             self.rb_event_handler.RBMoveEvent(self.rb_origin.x(), x)
 
     def MouseReleaseEvent(self, event):
         x = self.RubberBandX(event)
         if self.rb_in_view:
             selection_state = self.RubberBandRect(x)
         else:
             selection_state = None
         self.rb_event_handler.RBReleaseEvent(self.rb_origin.x(), x, selection_state)
 
 # Switch graph legend data model
 
 class SwitchGraphLegendModel(QAbstractTableModel):
 
     def __init__(self, collection, region_attributes, parent=None):
         super(SwitchGraphLegendModel, self).__init__(parent)
 
         self.region_attributes = region_attributes
 
         self.child_items = sorted(collection.hregions.values(), key=GraphDataRegionOrdinal)
         self.child_count = len(self.child_items)
 
         self.highlight_set = set()
 
         self.column_headers = ("pid", "tid", "comm")
 
     def rowCount(self, parent):
         return self.child_count
 
     def headerData(self, section, orientation, role):
         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 columnCount(self, parent=None):
         return len(self.column_headers)
 
     def columnHeader(self, column):
         return self.column_headers[column]
 
     def data(self, index, role):
         if role == Qt.BackgroundRole:
             child = self.child_items[index.row()]
             if child in self.highlight_set:
                 return self.region_attributes[child.key].colour
             return None
         if role == Qt.ForegroundRole:
             child = self.child_items[index.row()]
             if child in self.highlight_set:
                 return QColor(255, 255, 255)
             return self.region_attributes[child.key].colour
         if role != Qt.DisplayRole:
             return None
         hregion = self.child_items[index.row()]
         col = index.column()
         if col == 0:
             return hregion.pid
         if col == 1:
             return hregion.tid
         if col == 2:
             return hregion.comm
         return None
 
     def SetHighlight(self, row, set_highlight):
         child = self.child_items[row]
         top_left = self.createIndex(row, 0, child)
         bottom_right = self.createIndex(row, len(self.column_headers) - 1, child)
         self.dataChanged.emit(top_left, bottom_right)
 
     def Highlight(self, highlight_set):
         for row in xrange(self.child_count):
             child = self.child_items[row]
             if child in self.highlight_set:
                 if child not in highlight_set:
                     self.SetHighlight(row, False)
             elif child in highlight_set:
                 self.SetHighlight(row, True)
         self.highlight_set = highlight_set
 
 # Switch graph legend is a table
 
 class SwitchGraphLegend(QWidget):
 
     def __init__(self, collection, region_attributes, parent=None):
         super(SwitchGraphLegend, self).__init__(parent)
 
         self.data_model = SwitchGraphLegendModel(collection, region_attributes)
 
         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.view.resizeColumnsToContents()
         self.view.resizeRowsToContents()
 
         self.vbox = VBoxLayout(self.view)
         self.setLayout(self.vbox)
 
         sz1 = self.view.columnWidth(0) + self.view.columnWidth(1) + self.view.columnWidth(2) + 2
         sz1 = sz1 + self.view.verticalScrollBar().sizeHint().width()
         self.saved_size = sz1
 
     def resizeEvent(self, event):
         self.saved_size = self.size().width()
         super(SwitchGraphLegend, self).resizeEvent(event)
 
     def Highlight(self, highlight_set):
         self.data_model.Highlight(highlight_set)
         self.update()
 
     def changeEvent(self, event):
         if event.type() == QEvent.FontChange:
             self.view.resizeRowsToContents()
             self.view.resizeColumnsToContents()
             # Need to resize rows again after column resize
             self.view.resizeRowsToContents()
         super(SwitchGraphLegend, self).changeEvent(event)
 
 # Random colour generation
 
 def RGBColourTooLight(r, g, b):
     if g > 230:
         return True
     if g <= 160:
         return False
     if r <= 180 and g <= 180:
         return False
     if r < 60:
         return False
     return True
 
 def GenerateColours(x):
     cs = [0]
     for i in xrange(1, x):
         cs.append(int((255.0 / i) + 0.5))
     colours = []
     for r in cs:
         for g in cs:
             for b in cs:
                 # Exclude black and colours that look too light against a white background
                 if (r, g, b) == (0, 0, 0) or RGBColourTooLight(r, g, b):
                     continue
                 colours.append(QColor(r, g, b))
     return colours
 
 def GenerateNColours(n):
     for x in xrange(2, n + 2):
         colours = GenerateColours(x)
         if len(colours) >= n:
             return colours
     return []
 
 def GenerateNRandomColours(n, seed):
     colours = GenerateNColours(n)
     random.seed(seed)
     random.shuffle(colours)
     return colours
 
 # Graph attributes, in particular the scale and subrange that change when zooming
 
 class GraphAttributes():
 
     def __init__(self, scale, subrange, region_attributes, dp):
         self.scale = scale
         self.subrange = subrange
         self.region_attributes = region_attributes
         # Rounding avoids errors due to finite floating point precision
         self.dp = dp    # data decimal places
         self.Update()
 
     def XToPixel(self, x):
         return int(round((x - self.subrange.x.lo) * self.scale.x, self.pdp.x))
 
     def YToPixel(self, y):
         return int(round((y - self.subrange.y.lo) * self.scale.y, self.pdp.y))
 
     def PixelToXRounded(self, px):
         return round((round(px, 0) / self.scale.x), self.dp.x) + self.subrange.x.lo
 
     def PixelToYRounded(self, py):
         return round((round(py, 0) / self.scale.y), self.dp.y) + self.subrange.y.lo
 
     def PixelToX(self, px):
         x = self.PixelToXRounded(px)
         if self.pdp.x == 0:
             rt = self.XToPixel(x)
             if rt > px:
                 return x - 1
         return x
 
     def PixelToY(self, py):
         y = self.PixelToYRounded(py)
         if self.pdp.y == 0:
             rt = self.YToPixel(y)
             if rt > py:
                 return y - 1
         return y
 
     def ToPDP(self, dp, scale):
         # Calculate pixel decimal places:
         #    (10 ** dp) is the minimum delta in the data
         #    scale it to get the minimum delta in pixels
         #    log10 gives the number of decimals places negatively
         #    subtrace 1 to divide by 10
         #    round to the lower negative number
         #    change the sign to get the number of decimals positively
         x = math.log10((10 ** dp) * scale)
         if x < 0:
             x -= 1
             x = -int(math.floor(x) - 0.1)
         else:
             x = 0
         return x
 
     def Update(self):
         x = self.ToPDP(self.dp.x, self.scale.x)
         y = self.ToPDP(self.dp.y, self.scale.y)
         self.pdp = XY(x, y) # pixel decimal places
 
 # Switch graph splitter which divides the CPU graphs from the legend
 
 class SwitchGraphSplitter(QSplitter):
 
     def __init__(self, parent=None):
         super(SwitchGraphSplitter, self).__init__(parent)
 
         self.first_time = False
 
     def resizeEvent(self, ev):
         if self.first_time:
             self.first_time = False
             sz1 = self.widget(1).view.columnWidth(0) + self.widget(1).view.columnWidth(1) + self.widget(1).view.columnWidth(2) + 2
             sz1 = sz1 + self.widget(1).view.verticalScrollBar().sizeHint().width()
             sz0 = self.size().width() - self.handleWidth() - sz1
             self.setSizes([sz0, sz1])
         elif not(self.widget(1).saved_size is None):
             sz1 = self.widget(1).saved_size
             sz0 = self.size().width() - self.handleWidth() - sz1
             self.setSizes([sz0, sz1])
         super(SwitchGraphSplitter, self).resizeEvent(ev)
 
 # Graph widget base class
 
 class GraphWidget(QWidget):
 
     graph_title_changed = Signal(object)
 
     def __init__(self, parent=None):
         super(GraphWidget, self).__init__(parent)
 
     def GraphTitleChanged(self, title):
         self.graph_title_changed.emit(title)
 
     def Title(self):
         return ""
 
 # Display time in s, ms, us or ns
 
 def ToTimeStr(val):
     val = Decimal(val)
     if val >= 1000000000:
         return "{} s".format((val / 1000000000).quantize(Decimal("0.000000001")))
     if val >= 1000000:
         return "{} ms".format((val / 1000000).quantize(Decimal("0.000001")))
     if val >= 1000:
         return "{} us".format((val / 1000).quantize(Decimal("0.001")))
     return "{} ns".format(val.quantize(Decimal("1")))
 
 # Switch (i.e. context switch i.e. Time Chart by CPU) graph widget which contains the CPU graphs and the legend and control buttons
 
 class SwitchGraphWidget(GraphWidget):
 
     def __init__(self, glb, collection, parent=None):
         super(SwitchGraphWidget, self).__init__(parent)
 
         self.glb = glb
         self.collection = collection
 
         self.back_state = []
         self.forward_state = []
         self.selection_state = (None, None)
         self.fwd_rect = None
         self.start_time = self.glb.StartTime(collection.machine_id)
 
         i = 0
         hregions = collection.hregions.values()
         colours = GenerateNRandomColours(len(hregions), 1013)
         region_attributes = {}
         for hregion in hregions:
             if hregion.pid == 0 and hregion.tid == 0:
                 region_attributes[hregion.key] = GraphRegionAttribute(QColor(0, 0, 0))
             else:
                 region_attributes[hregion.key] = GraphRegionAttribute(colours[i])
                 i = i + 1
 
         # Default to entire range
         xsubrange = Subrange(0.0, float(collection.xrangehi - collection.xrangelo) + 1.0)
         ysubrange = Subrange(0.0, float(collection.yrangehi - collection.yrangelo) + 1.0)
         subrange = XY(xsubrange, ysubrange)
 
         scale = self.GetScaleForRange(subrange)
 
         self.attrs = GraphAttributes(scale, subrange, region_attributes, collection.dp)
 
         self.item = VertcalGraphSetGraphicsItem(collection, self.attrs, self, SwitchGraphGraphicsItem)
 
         self.scene = QGraphicsScene()
         self.scene.addItem(self.item)
 
         self.view = QGraphicsView(self.scene)
         self.view.centerOn(0, 0)
         self.view.setAlignment(Qt.AlignLeft | Qt.AlignTop)
 
         self.legend = SwitchGraphLegend(collection, region_attributes)
 
         self.splitter = SwitchGraphSplitter()
         self.splitter.addWidget(self.view)
         self.splitter.addWidget(self.legend)
 
         self.point_label = QLabel("")
         self.point_label.setSizePolicy(QSizePolicy.Preferred, QSizePolicy.Fixed)
 
         self.back_button = QToolButton()
         self.back_button.setIcon(self.style().standardIcon(QStyle.SP_ArrowLeft))
         self.back_button.setDisabled(True)
         self.back_button.released.connect(lambda: self.Back())
 
         self.forward_button = QToolButton()
         self.forward_button.setIcon(self.style().standardIcon(QStyle.SP_ArrowRight))
         self.forward_button.setDisabled(True)
         self.forward_button.released.connect(lambda: self.Forward())
 
         self.zoom_button = QToolButton()
         self.zoom_button.setText("Zoom")
         self.zoom_button.setDisabled(True)
         self.zoom_button.released.connect(lambda: self.Zoom())
 
         self.hbox = HBoxLayout(self.back_button, self.forward_button, self.zoom_button, self.point_label)
 
         self.vbox = VBoxLayout(self.splitter, self.hbox)
 
         self.setLayout(self.vbox)
 
     def GetScaleForRangeX(self, xsubrange):
         # Default graph 1000 pixels wide
         dflt = 1000.0
         r = xsubrange.hi - xsubrange.lo
         return dflt / r
 
     def GetScaleForRangeY(self, ysubrange):
         # Default graph 50 pixels high
         dflt = 50.0
         r = ysubrange.hi - ysubrange.lo
         return dflt / r
 
     def GetScaleForRange(self, subrange):
         # Default graph 1000 pixels wide, 50 pixels high
         xscale = self.GetScaleForRangeX(subrange.x)
         yscale = self.GetScaleForRangeY(subrange.y)
         return XY(xscale, yscale)
 
     def PointEvent(self, cpu, time_from, time_to, hregions):
         text = "CPU: " + str(cpu)
         time_from = time_from.quantize(Decimal(1))
         rel_time_from = time_from - self.glb.StartTime(self.collection.machine_id)
         text = text + " Time: " + str(time_from) + " (+" + ToTimeStr(rel_time_from) + ")"
         self.point_label.setText(text)
         self.legend.Highlight(hregions)
 
     def RightClickEvent(self, cpu, hregion_times, pos):
         if not IsSelectable(self.glb.db, "calls", "WHERE parent_id >= 0"):
             return
         menu = QMenu(self.view)
         for hregion, time in hregion_times:
             thread_at_time = (hregion.exec_comm_id, hregion.thread_id, time)
             menu_text = "Show Call Tree for {} {}:{} at {}".format(hregion.comm, hregion.pid, hregion.tid, time)
             menu.addAction(CreateAction(menu_text, "Show Call Tree", lambda a=None, args=thread_at_time: self.RightClickSelect(args), self.view))
         menu.exec_(pos)
 
     def RightClickSelect(self, args):
         CallTreeWindow(self.glb, self.glb.mainwindow, thread_at_time=args)
 
     def NoPointEvent(self):
         self.point_label.setText("")
         self.legend.Highlight({})
 
     def RangeEvent(self, time_from, time_to):
         time_from = time_from.quantize(Decimal(1))
         time_to = time_to.quantize(Decimal(1))
         if time_to <= time_from:
             self.point_label.setText("")
             return
         rel_time_from = time_from - self.start_time
         rel_time_to = time_to - self.start_time
         text = " Time: " + str(time_from) + " (+" + ToTimeStr(rel_time_from) + ") to: " + str(time_to) + " (+" + ToTimeStr(rel_time_to) + ")"
         text = text + " duration: " + ToTimeStr(time_to - time_from)
         self.point_label.setText(text)
 
     def BackState(self):
         return (self.attrs.subrange, self.attrs.scale, self.selection_state, self.fwd_rect)
 
     def PushBackState(self):
         state = copy.deepcopy(self.BackState())
         self.back_state.append(state)
         self.back_button.setEnabled(True)
 
     def PopBackState(self):
         self.attrs.subrange, self.attrs.scale, self.selection_state, self.fwd_rect = self.back_state.pop()
         self.attrs.Update()
         if not self.back_state:
             self.back_button.setDisabled(True)
 
     def PushForwardState(self):
         state = copy.deepcopy(self.BackState())
         self.forward_state.append(state)
         self.forward_button.setEnabled(True)
 
     def PopForwardState(self):
         self.attrs.subrange, self.attrs.scale, self.selection_state, self.fwd_rect = self.forward_state.pop()
         self.attrs.Update()
         if not self.forward_state:
             self.forward_button.setDisabled(True)
 
     def Title(self):
         time_from = self.collection.xrangelo + Decimal(self.attrs.subrange.x.lo)
         time_to = self.collection.xrangelo + Decimal(self.attrs.subrange.x.hi)
         rel_time_from = time_from - self.start_time
         rel_time_to = time_to - self.start_time
         title = "+" + ToTimeStr(rel_time_from) + " to +" + ToTimeStr(rel_time_to)
         title = title + " (" + ToTimeStr(time_to - time_from) + ")"
         return title
 
     def Update(self):
         selected_subrange, selection_state = self.selection_state
         self.item.SetSelection(selection_state)
         self.item.SetBracket(self.fwd_rect)
         self.zoom_button.setDisabled(selected_subrange is None)
         self.GraphTitleChanged(self.Title())
         self.item.update(self.item.boundingRect())
 
     def Back(self):
         if not self.back_state:
             return
         self.PushForwardState()
         self.PopBackState()
         self.Update()
 
     def Forward(self):
         if not self.forward_state:
             return
         self.PushBackState()
         self.PopForwardState()
         self.Update()
 
     def SelectEvent(self, x0, x1, selection_state):
         if selection_state is None:
             selected_subrange = None
         else:
             if x1 - x0 < 1.0:
                 x1 += 1.0
             selected_subrange = Subrange(x0, x1)
         self.selection_state = (selected_subrange, selection_state)
         self.zoom_button.setDisabled(selected_subrange is None)
 
     def Zoom(self):
         selected_subrange, selection_state = self.selection_state
         if selected_subrange is None:
             return
         self.fwd_rect = selection_state
         self.item.SetSelection(None)
         self.PushBackState()
         self.attrs.subrange.x = selected_subrange
         self.forward_state = []
         self.forward_button.setDisabled(True)
         self.selection_state = (None, None)
         self.fwd_rect = None
         self.attrs.scale.x = self.GetScaleForRangeX(self.attrs.subrange.x)
         self.attrs.Update()
         self.Update()
 
 # Slow initialization - perform non-GUI initialization in a separate thread and put up a modal message box while waiting
 
 class SlowInitClass():
 
     def __init__(self, glb, title, init_fn):
         self.init_fn = init_fn
         self.done = False
         self.result = None
 
         self.msg_box = QMessageBox(glb.mainwindow)
         self.msg_box.setText("Initializing " + title + ". Please wait.")
         self.msg_box.setWindowTitle("Initializing " + title)
         self.msg_box.setWindowIcon(glb.mainwindow.style().standardIcon(QStyle.SP_MessageBoxInformation))
 
         self.init_thread = Thread(self.ThreadFn, glb)
         self.init_thread.done.connect(lambda: self.Done(), Qt.QueuedConnection)
 
         self.init_thread.start()
 
     def Done(self):
         self.msg_box.done(0)
 
     def ThreadFn(self, glb):
         conn_name = "SlowInitClass" + str(os.getpid())
         db, dbname = glb.dbref.Open(conn_name)
         self.result = self.init_fn(db)
         self.done = True
         return (True, 0)
 
     def Result(self):
         while not self.done:
             self.msg_box.exec_()
         self.init_thread.wait()
         return self.result
 
 def SlowInit(glb, title, init_fn):
     init = SlowInitClass(glb, title, init_fn)
     return init.Result()
 
 # Time chart by CPU window
 
 class TimeChartByCPUWindow(QMdiSubWindow):
 
     def __init__(self, glb, parent=None):
         super(TimeChartByCPUWindow, self).__init__(parent)
 
         self.glb = glb
         self.machine_id = glb.HostMachineId()
         self.collection_name = "SwitchGraphDataCollection " + str(self.machine_id)
 
         collection = LookupModel(self.collection_name)
         if collection is None:
             collection = SlowInit(glb, "Time Chart", self.Init)
 
         self.widget = SwitchGraphWidget(glb, collection, self)
         self.view = self.widget
 
         self.base_title = "Time Chart by CPU"
         self.setWindowTitle(self.base_title + self.widget.Title())
         self.widget.graph_title_changed.connect(self.GraphTitleChanged)
 
         self.setWidget(self.widget)
 
         AddSubWindow(glb.mainwindow.mdi_area, self, self.windowTitle())
 
     def Init(self, db):
         return LookupCreateModel(self.collection_name, lambda : SwitchGraphDataCollection(self.glb, db, self.machine_id))
 
     def GraphTitleChanged(self, title):
         self.setWindowTitle(self.base_title + " : " + title)
 
 # 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, col, text, parent_item):
         self.row = row
         self.parent_item = parent_item
         self.data = [""] * (col + 1)
         self.data[col] = 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
         self.br_col = len(self.data) - 1
 
     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, self.br_col, 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 ""
 
 # Calculate instructions per cycle
 
 def CalcIPC(cyc_cnt, insn_cnt):
     if cyc_cnt and insn_cnt:
         ipc = Decimal(float(insn_cnt) / cyc_cnt)
         ipc = str(ipc.quantize(Decimal(".01"), rounding=ROUND_HALF_UP))
     else:
         ipc = "0"
     return ipc
 
 # Branch data preparation
 
 def BranchDataPrepBr(query, data):
     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)) + ")")
 
 def BranchDataPrepIPC(query, data):
     insn_cnt = query.value(16)
     cyc_cnt = query.value(17)
     ipc = CalcIPC(cyc_cnt, insn_cnt)
     data.append(insn_cnt)
     data.append(cyc_cnt)
     data.append(ipc)
 
 def BranchDataPrep(query):
     data = []
     for i in xrange(0, 8):
         data.append(query.value(i))
     BranchDataPrepBr(query, data)
     return data
 
 def BranchDataPrepWA(query):
     data = []
     data.append(query.value(0))
     # Workaround pyside failing to handle large integers (i.e. time) in python3 by converting to a string
     data.append("{:>19}".format(query.value(1)))
     for i in xrange(2, 8):
         data.append(query.value(i))
     BranchDataPrepBr(query, data)
     return data
 
 def BranchDataWithIPCPrep(query):
     data = []
     for i in xrange(0, 8):
         data.append(query.value(i))
     BranchDataPrepIPC(query, data)
     BranchDataPrepBr(query, data)
     return data
 
 def BranchDataWithIPCPrepWA(query):
     data = []
     data.append(query.value(0))
     # Workaround pyside failing to handle large integers (i.e. time) in python3 by converting to a string
     data.append("{:>19}".format(query.value(1)))
     for i in xrange(2, 8):
         data.append(query.value(i))
     BranchDataPrepIPC(query, data)
     BranchDataPrepBr(query, data)
     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, None, parent)
         self.event_id = event_id
         self.more = True
         self.populated = 0
         self.have_ipc = IsSelectable(glb.db, "samples", columns = "insn_count, cyc_count")
         if self.have_ipc:
             select_ipc = ", insn_count, cyc_count"
             prep_fn = BranchDataWithIPCPrep
             prep_wa_fn = BranchDataWithIPCPrepWA
         else:
             select_ipc = ""
             prep_fn = BranchDataPrep
             prep_wa_fn = BranchDataPrepWA
         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"
             + select_ipc +
             " 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))
         if pyside_version_1 and sys.version_info[0] == 3:
             prep = prep_fn
         else:
             prep = prep_wa_fn
         self.fetcher = SQLFetcher(glb, sql, prep, self.AddSample)
         self.fetcher.done.connect(self.Update)
         self.fetcher.Fetch(glb_chunk_sz)
 
     def GetRoot(self):
         return BranchRootItem()
 
     def columnCount(self, parent=None):
         if self.have_ipc:
             return 11
         else:
             return 8
 
     def columnHeader(self, column):
         if self.have_ipc:
             return ("Time", "CPU", "Command", "PID", "TID", "Branch Type", "In Tx", "Insn Cnt", "Cyc Cnt", "IPC", "Branch")[column]
         else:
             return ("Time", "CPU", "Command", "PID", "TID", "Branch Type", "In Tx", "Branch")[column]
 
     def columnFont(self, column):
         if self.have_ipc:
             br_col = 10
         else:
             br_col = 7
         if column != br_col:
             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.setSelectionMode(QAbstractItemView.ContiguousSelection)
         self.view.CopyCellsToClipboard = CopyTreeCellsToClipboard
         self.view.setModel(self.model)
 
         self.ResizeColumnsToContents()
 
         self.context_menu = TreeContextMenu(self.view)
 
         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.first_time = int(glb.HostStartTime())
         self.last_time = int(glb.HostFinishTime())
         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 = "", columns = "*"):
     query = QSqlQuery(db)
     try:
         QueryExec(query, "SELECT " + columns + " FROM " + table + " " + sql + " LIMIT 1")
     except:
         return False
     return True
 
 # 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): self.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]
 
     def SQLTableDataPrep(self, query, count):
         data = []
         for i in xrange(count):
             data.append(query.value(i))
         return data
 
 # 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))
         if pyside_version_1 and sys.version_info[0] == 3:
             if table_name == "samples_view":
                 self.SQLTableDataPrep = self.samples_view_DataPrep
             if table_name == "samples":
                 self.SQLTableDataPrep = self.samples_DataPrep
         super(SQLAutoTableModel, self).__init__(glb, sql, column_headers, parent)
 
     def samples_view_DataPrep(self, query, count):
         data = []
         data.append(query.value(0))
         # Workaround pyside failing to handle large integers (i.e. time) in python3 by converting to a string
         data.append("{:>19}".format(query.value(1)))
         for i in xrange(2, count):
             data.append(query.value(i))
         return data
 
     def samples_DataPrep(self, query, count):
         data = []
         for i in xrange(9):
             data.append(query.value(i))
         # Workaround pyside failing to handle large integers (i.e. time) in python3 by converting to a string
         data.append("{:>19}".format(query.value(9)))
         for i in xrange(10, count):
             data.append(query.value(i))
         return data
 
 # 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()
 
 # Convert value to CSV
 
 def ToCSValue(val):
     if '"' in val:
         val = val.replace('"', '""')
     if "," in val or '"' in val:
         val = '"' + val + '"'
     return val
 
 # Key to sort table model indexes by row / column, assuming fewer than 1000 columns
 
 glb_max_cols = 1000
 
 def RowColumnKey(a):
     return a.row() * glb_max_cols + a.column()
 
 # Copy selected table cells to clipboard
 
 def CopyTableCellsToClipboard(view, as_csv=False, with_hdr=False):
     indexes = sorted(view.selectedIndexes(), key=RowColumnKey)
     idx_cnt = len(indexes)
     if not idx_cnt:
         return
     if idx_cnt == 1:
         with_hdr=False
     min_row = indexes[0].row()
     max_row = indexes[0].row()
     min_col = indexes[0].column()
     max_col = indexes[0].column()
     for i in indexes:
         min_row = min(min_row, i.row())
         max_row = max(max_row, i.row())
         min_col = min(min_col, i.column())
         max_col = max(max_col, i.column())
     if max_col > glb_max_cols:
         raise RuntimeError("glb_max_cols is too low")
     max_width = [0] * (1 + max_col - min_col)
     for i in indexes:
         c = i.column() - min_col
         max_width[c] = max(max_width[c], len(str(i.data())))
     text = ""
     pad = ""
     sep = ""
     if with_hdr:
         model = indexes[0].model()
         for col in range(min_col, max_col + 1):
             val = model.headerData(col, Qt.Horizontal, Qt.DisplayRole)
             if as_csv:
                 text += sep + ToCSValue(val)
                 sep = ","
             else:
                 c = col - min_col
                 max_width[c] = max(max_width[c], len(val))
                 width = max_width[c]
                 align = model.headerData(col, Qt.Horizontal, Qt.TextAlignmentRole)
                 if align & Qt.AlignRight:
                     val = val.rjust(width)
                 text += pad + sep + val
                 pad = " " * (width - len(val))
                 sep = "  "
         text += "\n"
         pad = ""
         sep = ""
     last_row = min_row
     for i in indexes:
         if i.row() > last_row:
             last_row = i.row()
             text += "\n"
             pad = ""
             sep = ""
         if as_csv:
             text += sep + ToCSValue(str(i.data()))
             sep = ","
         else:
             width = max_width[i.column() - min_col]
             if i.data(Qt.TextAlignmentRole) & Qt.AlignRight:
                 val = str(i.data()).rjust(width)
             else:
                 val = str(i.data())
             text += pad + sep + val
             pad = " " * (width - len(val))
             sep = "  "
     QApplication.clipboard().setText(text)
 
 def CopyTreeCellsToClipboard(view, as_csv=False, with_hdr=False):
     indexes = view.selectedIndexes()
     if not len(indexes):
         return
 
     selection = view.selectionModel()
 
     first = None
     for i in indexes:
         above = view.indexAbove(i)
         if not selection.isSelected(above):
             first = i
             break
 
     if first is None:
         raise RuntimeError("CopyTreeCellsToClipboard internal error")
 
     model = first.model()
     row_cnt = 0
     col_cnt = model.columnCount(first)
     max_width = [0] * col_cnt
 
     indent_sz = 2
     indent_str = " " * indent_sz
 
     expanded_mark_sz = 2
     if sys.version_info[0] == 3:
         expanded_mark = "\u25BC "
         not_expanded_mark = "\u25B6 "
     else:
         expanded_mark = unicode(chr(0xE2) + chr(0x96) + chr(0xBC) + " ", "utf-8")
         not_expanded_mark =  unicode(chr(0xE2) + chr(0x96) + chr(0xB6) + " ", "utf-8")
     leaf_mark = "  "
 
     if not as_csv:
         pos = first
         while True:
             row_cnt += 1
             row = pos.row()
             for c in range(col_cnt):
                 i = pos.sibling(row, c)
                 if c:
                     n = len(str(i.data()))
                 else:
                     n = len(str(i.data()).strip())
                     n += (i.internalPointer().level - 1) * indent_sz
                     n += expanded_mark_sz
                 max_width[c] = max(max_width[c], n)
             pos = view.indexBelow(pos)
             if not selection.isSelected(pos):
                 break
 
     text = ""
     pad = ""
     sep = ""
     if with_hdr:
         for c in range(col_cnt):
             val = model.headerData(c, Qt.Horizontal, Qt.DisplayRole).strip()
             if as_csv:
                 text += sep + ToCSValue(val)
                 sep = ","
             else:
                 max_width[c] = max(max_width[c], len(val))
                 width = max_width[c]
                 align = model.headerData(c, Qt.Horizontal, Qt.TextAlignmentRole)
                 if align & Qt.AlignRight:
                     val = val.rjust(width)
                 text += pad + sep + val
                 pad = " " * (width - len(val))
                 sep = "   "
         text += "\n"
         pad = ""
         sep = ""
 
     pos = first
     while True:
         row = pos.row()
         for c in range(col_cnt):
             i = pos.sibling(row, c)
             val = str(i.data())
             if not c:
                 if model.hasChildren(i):
                     if view.isExpanded(i):
                         mark = expanded_mark
                     else:
                         mark = not_expanded_mark
                 else:
                     mark = leaf_mark
                 val = indent_str * (i.internalPointer().level - 1) + mark + val.strip()
             if as_csv:
                 text += sep + ToCSValue(val)
                 sep = ","
             else:
                 width = max_width[c]
                 if c and i.data(Qt.TextAlignmentRole) & Qt.AlignRight:
                     val = val.rjust(width)
                 text += pad + sep + val
                 pad = " " * (width - len(val))
                 sep = "   "
         pos = view.indexBelow(pos)
         if not selection.isSelected(pos):
             break
         text = text.rstrip() + "\n"
         pad = ""
         sep = ""
 
     QApplication.clipboard().setText(text)
 
 def CopyCellsToClipboard(view, as_csv=False, with_hdr=False):
     view.CopyCellsToClipboard(view, as_csv, with_hdr)
 
 def CopyCellsToClipboardHdr(view):
     CopyCellsToClipboard(view, False, True)
 
 def CopyCellsToClipboardCSV(view):
     CopyCellsToClipboard(view, True, True)
 
 # Context menu
 
 class ContextMenu(object):
 
     def __init__(self, view):
         self.view = view
         self.view.setContextMenuPolicy(Qt.CustomContextMenu)
         self.view.customContextMenuRequested.connect(self.ShowContextMenu)
 
     def ShowContextMenu(self, pos):
         menu = QMenu(self.view)
         self.AddActions(menu)
         menu.exec_(self.view.mapToGlobal(pos))
 
     def AddCopy(self, menu):
         menu.addAction(CreateAction("&Copy selection", "Copy to clipboard", lambda: CopyCellsToClipboardHdr(self.view), self.view))
         menu.addAction(CreateAction("Copy selection as CS&V", "Copy to clipboard as CSV", lambda: CopyCellsToClipboardCSV(self.view), self.view))
 
     def AddActions(self, menu):
         self.AddCopy(menu)
 
 class TreeContextMenu(ContextMenu):
 
     def __init__(self, view):
         super(TreeContextMenu, self).__init__(view)
 
     def AddActions(self, menu):
         i = self.view.currentIndex()
         text = str(i.data()).strip()
         if len(text):
             menu.addAction(CreateAction('Copy "' + text + '"', "Copy to clipboard", lambda: QApplication.clipboard().setText(text), self.view))
         self.AddCopy(menu)
 
 # 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.view.setSelectionMode(QAbstractItemView.ContiguousSelection)
         self.view.CopyCellsToClipboard = CopyTableCellsToClipboard
 
         self.ResizeColumnsToContents()
 
         self.context_menu = ContextMenu(self.view)
 
         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.view.setSelectionMode(QAbstractItemView.ContiguousSelection)
         self.view.CopyCellsToClipboard = CopyTableCellsToClipboard
 
         self.context_menu = ContextMenu(self.view)
 
         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 a=None,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=#charts>2. Charts</a></p>
 <p class=c2><a href=#timechartbycpu>2.1 Time chart by CPU</a></p>
 <p class=c1><a href=#tables>3. 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>Instructions per Cycle (IPC)</h3>
 If available, IPC information is displayed in columns 'insn_cnt', 'cyc_cnt' and 'IPC'.
 <p><b>Intel PT note:</b> The information applies to the blocks of code ending with, and including, that branch.
 Due to the granularity of timing information, the number of cycles for some code blocks will not be known.
 In that case, 'insn_cnt', 'cyc_cnt' and 'IPC' are zero, but when 'IPC' is displayed it covers the period
 since the previous displayed 'IPC'.
 <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=charts>2. Charts</h1>
 <h2 id=timechartbycpu>2.1 Time chart by CPU</h2>
 This chart displays context switch information when that data is available. Refer to context_switches_view on the Tables menu.
 <h3>Features</h3>
 <ol>
 <li>Mouse over to highight the task and show the time</li>
 <li>Drag the mouse to select a region and zoom by pushing the Zoom button</li>
 <li>Go back and forward by pressing the arrow buttons</li>
 <li>If call information is available, right-click to show a call tree opened to that task and time.
 Note, the call tree may take some time to appear, and there may not be call information for the task or time selected.
 </li>
 </ol>
 <h3>Important</h3>
 The graph can be misleading in the following respects:
 <ol>
 <li>The graph shows the first task on each CPU as running from the beginning of the time range.
 Because tracing might start on different CPUs at different times, that is not necessarily the case.
 Refer to context_switches_view on the Tables menu to understand what data the graph is based upon.</li>
 <li>Similarly, the last task on each CPU can be showing running longer than it really was.
 Again, refer to context_switches_view on the Tables menu to understand what data the graph is based upon.</li>
 <li>When the mouse is over a task, the highlighted task might not be visible on the legend without scrolling if the legend does not fit fully in the window</li>
 </ol>
 <h1 id=tables>3. 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)
 
 # PostqreSQL server version
 
 def PostqreSQLServerVersion(db):
     query = QSqlQuery(db)
     QueryExec(query, "SELECT VERSION()")
     if query.next():
         v_str = query.value(0)
         v_list = v_str.strip().split(" ")
         if v_list[0] == "PostgreSQL" and v_list[2] == "on":
             return v_list[1]
         return v_str
     return "Unknown"
 
 # SQLite version
 
 def SQLiteVersion(db):
     query = QSqlQuery(db)
     QueryExec(query, "SELECT sqlite_version()")
     if query.next():
         return query.value(0)
     return "Unknown"
 
 # About dialog
 
 class AboutDialog(QDialog):
 
     def __init__(self, glb, parent=None):
         super(AboutDialog, self).__init__(parent)
 
         self.setWindowTitle("About Exported SQL Viewer")
         self.setMinimumWidth(300)
 
         pyside_version = "1" if pyside_version_1 else "2"
 
         text = "<pre>"
         text += "Python version:     " + sys.version.split(" ")[0] + "\n"
         text += "PySide version:     " + pyside_version + "\n"
         text += "Qt version:         " + qVersion() + "\n"
         if glb.dbref.is_sqlite3:
             text += "SQLite version:     " + SQLiteVersion(glb.db) + "\n"
         else:
             text += "PostqreSQL version: " + PostqreSQLServerVersion(glb.db) + "\n"
         text += "</pre>"
 
         self.text = QTextBrowser()
         self.text.setHtml(text)
         self.text.setReadOnly(True)
         self.text.setOpenExternalLinks(True)
 
         self.vbox = QVBoxLayout()
         self.vbox.addWidget(self.text)
 
         self.setLayout(self.vbox)
 
 # 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("&Copy", "Copy to clipboard", self.CopyToClipboard, self, QKeySequence.Copy))
         edit_menu.addAction(CreateAction("Copy as CS&V", "Copy to clipboard as CSV", self.CopyToClipboardCSV, self))
         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))
 
         if IsSelectable(glb.db, "context_switches"):
             charts_menu = menu.addMenu("&Charts")
             charts_menu.addAction(CreateAction("&Time chart by CPU", "Create a new window displaying time charts by CPU", self.TimeChartByCPU, 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))
         help_menu.addAction(CreateAction("&About Exported SQL Viewer", "About this application", self.About, self))
 
     def Try(self, fn):
         win = self.mdi_area.activeSubWindow()
         if win:
             try:
                 fn(win.view)
             except:
                 pass
 
     def CopyToClipboard(self):
         self.Try(CopyCellsToClipboardHdr)
 
     def CopyToClipboardCSV(self):
         self.Try(CopyCellsToClipboardCSV)
 
     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):
         self.Try(ShrinkFont)
 
     def EnlargeFont(self):
         self.Try(EnlargeFont)
 
     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 a=None,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 a=None,x=dbid: self.NewSelectedBranchView(x), self))
 
     def TimeChartByCPU(self):
         TimeChartByCPUWindow(self.glb, 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 a=None,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)
 
     def About(self):
         dialog = AboutDialog(self.glb, self)
         dialog.exec_()
 
 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]
     if sys.version_info[0] == 2:
         eclass = ord(header[4])
         encoding = ord(header[5])
         version = ord(header[6])
     else:
         eclass = header[4]
         encoding = header[5]
         version = 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
         self.host_machine_id = 0
         self.host_start_time = 0
         self.host_finish_time = 0
 
     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
 
     def GetHostMachineId(self):
         query = QSqlQuery(self.db)
         QueryExec(query, "SELECT id FROM machines WHERE pid = -1")
         if query.next():
             self.host_machine_id = query.value(0)
         else:
             self.host_machine_id = 0
         return self.host_machine_id
 
     def HostMachineId(self):
         if self.host_machine_id:
             return self.host_machine_id
         return self.GetHostMachineId()
 
     def SelectValue(self, sql):
         query = QSqlQuery(self.db)
         try:
             QueryExec(query, sql)
         except:
             return None
         if query.next():
             return Decimal(query.value(0))
         return None
 
     def SwitchesMinTime(self, machine_id):
         return self.SelectValue("SELECT time"
                     " FROM context_switches"
                     " WHERE time != 0 AND machine_id = " + str(machine_id) +
                     " ORDER BY id LIMIT 1")
 
     def SwitchesMaxTime(self, machine_id):
         return self.SelectValue("SELECT time"
                     " FROM context_switches"
                     " WHERE time != 0 AND machine_id = " + str(machine_id) +
                     " ORDER BY id DESC LIMIT 1")
 
     def SamplesMinTime(self, machine_id):
         return self.SelectValue("SELECT time"
                     " FROM samples"
                     " WHERE time != 0 AND machine_id = " + str(machine_id) +
                     " ORDER BY id LIMIT 1")
 
     def SamplesMaxTime(self, machine_id):
         return self.SelectValue("SELECT time"
                     " FROM samples"
                     " WHERE time != 0 AND machine_id = " + str(machine_id) +
                     " ORDER BY id DESC LIMIT 1")
 
     def CallsMinTime(self, machine_id):
         return self.SelectValue("SELECT calls.call_time"
                     " FROM calls"
                     " INNER JOIN threads ON threads.thread_id = calls.thread_id"
                     " WHERE calls.call_time != 0 AND threads.machine_id = " + str(machine_id) +
                     " ORDER BY calls.id LIMIT 1")
 
     def CallsMaxTime(self, machine_id):
         return self.SelectValue("SELECT calls.return_time"
                     " FROM calls"
                     " INNER JOIN threads ON threads.thread_id = calls.thread_id"
                     " WHERE calls.return_time != 0 AND threads.machine_id = " + str(machine_id) +
                     " ORDER BY calls.return_time DESC LIMIT 1")
 
     def GetStartTime(self, machine_id):
         t0 = self.SwitchesMinTime(machine_id)
         t1 = self.SamplesMinTime(machine_id)
         t2 = self.CallsMinTime(machine_id)
         if t0 is None or (not(t1 is None) and t1 < t0):
             t0 = t1
         if t0 is None or (not(t2 is None) and t2 < t0):
             t0 = t2
         return t0
 
     def GetFinishTime(self, machine_id):
         t0 = self.SwitchesMaxTime(machine_id)
         t1 = self.SamplesMaxTime(machine_id)
         t2 = self.CallsMaxTime(machine_id)
         if t0 is None or (not(t1 is None) and t1 > t0):
             t0 = t1
         if t0 is None or (not(t2 is None) and t2 > t0):
             t0 = t2
         return t0
 
     def HostStartTime(self):
         if self.host_start_time:
             return self.host_start_time
         self.host_start_time = self.GetStartTime(self.HostMachineId())
         return self.host_start_time
 
     def HostFinishTime(self):
         if self.host_finish_time:
             return self.host_finish_time
         self.host_finish_time = self.GetFinishTime(self.HostMachineId())
         return self.host_finish_time
 
     def StartTime(self, machine_id):
         if machine_id == self.HostMachineId():
             return self.HostStartTime()
         return self.GetStartTime(machine_id)
 
     def FinishTime(self, machine_id):
         if machine_id == self.HostMachineId():
             return self.HostFinishTime()
         return self.GetFinishTime(machine_id)
 
 # Database reference
 
 class DBRef():
 
     def __init__(self, is_sqlite3, dbname):
         self.is_sqlite3 = is_sqlite3
         self.dbname = dbname
         self.TRUE = "TRUE"
         self.FALSE = "FALSE"
         # SQLite prior to version 3.23 does not support TRUE and FALSE
         if self.is_sqlite3:
             self.TRUE = "1"
             self.FALSE = "0"
 
     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():
     usage_str = "exported-sql-viewer.py [--pyside-version-1] <database name>\n" \
             "   or: exported-sql-viewer.py --help-only"
     ap = argparse.ArgumentParser(usage = usage_str, add_help = False)
     ap.add_argument("--pyside-version-1", action='store_true')
     ap.add_argument("dbname", nargs="?")
     ap.add_argument("--help-only", action='store_true')
     args = ap.parse_args()
 
     if args.help_only:
         app = QApplication(sys.argv)
         mainwindow = HelpOnlyWindow()
         mainwindow.show()
         err = app.exec_()
         sys.exit(err)
 
     dbname = args.dbname
     if dbname is None:
         ap.print_usage()
         print("Too few arguments")
         sys.exit(1)
 
     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()