"""Test lldb's startup delays creating a target and setting a breakpoint."""

import os, sys
import unittest2
import lldb
import pexpect
from lldbbench import *

class StartupDelaysBench(BenchBase):

    mydir = os.path.join("benchmarks", "startup")

    def setUp(self):
        BenchBase.setUp(self)
        # Create self.stopwatch2 for measuring "set first breakpoint".
        # The default self.stopwatch is for "create fresh target".
        self.stopwatch2 = Stopwatch()
        if lldb.bmExecutable:
            self.exe = lldb.bmExecutable
        else:
            self.exe = self.lldbHere
        if lldb.bmBreakpointSpec:
            self.break_spec = lldb.bmBreakpointSpec
        else:
            self.break_spec = '-n main'

        self.count = lldb.bmIterationCount
        if self.count <= 0:
            self.count = 15

    @benchmarks_test
    def test_startup_delay(self):
        """Test start up delays creating a target and setting a breakpoint."""
        print
        self.run_startup_delays_bench(self.exe, self.break_spec, self.count)
        print "lldb startup delays benchmark:"
        print "create fresh target:", self.stopwatch
        print "set first breakpoint:", self.stopwatch2

    def run_startup_delays_bench(self, exe, break_spec, count):
        # Set self.child_prompt, which is "(lldb) ".
        self.child_prompt = '(lldb) '
        prompt = self.child_prompt

        # Reset the stopwatchs now.
        self.stopwatch.reset()
        self.stopwatch2.reset()
        for i in range(count):
            # So that the child gets torn down after the test.
            self.child = pexpect.spawn('%s %s' % (self.lldbHere, self.lldbOption))
            child = self.child

            # Turn on logging for what the child sends back.
            if self.TraceOn():
                child.logfile_read = sys.stdout

            with self.stopwatch:
                # Create a fresh target.
                child.sendline('file %s' % exe) # Aka 'target create'.
                child.expect_exact(prompt)

            with self.stopwatch2:
                # Read debug info and set the first breakpoint.
                child.sendline('breakpoint set %s' % break_spec)
                child.expect_exact(prompt)

            child.sendline('quit')
            try:
                self.child.expect(pexpect.EOF)
            except:
                pass

        # The test is about to end and if we come to here, the child process has
        # been terminated.  Mark it so.
        self.child = None


if __name__ == '__main__':
    import atexit
    lldb.SBDebugger.Initialize()
    atexit.register(lambda: lldb.SBDebugger.Terminate())
    unittest2.main()

Add a benchmark for measuring start up delays of lldb, including:
Add a benchmark for measuring start up delays of lldb, including:

o create a fresh target; and
o set the first breakpoint

Example (using lldb to set a breakpoint on lldb's Driver::MainLoop function):

./dotest.py -v +b -x '-F Driver::MainLoop()' -p TestStartupDelays.py

...

1: test_startup_delay (TestStartupDelays.StartupDelaysBench)
   Test start up delays creating a target and setting a breakpoint. ... 
lldb startup delays benchmark:
create fresh target: Avg: 0.106732 (Laps: 15, Total Elapsed Time: 1.600985)
set first breakpoint: Avg: 0.102589 (Laps: 15, Total Elapsed Time: 1.538832)
ok



git-svn-id: b33bab8abb5b18c12ee100cd7761ab452d00b2b0@142628 91177308-0d34-0410-b5e6-96231b3b80d8
