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      1 """Disassemble lldb's Driver::MainLoop() functions comparing Xcode 4.1 vs. 4.2's gdb."""
      2 
      3 import os, sys
      4 import unittest2
      5 import lldb
      6 import pexpect
      7 from lldbbench import *
      8 
      9 class XCode41Vs42GDBDisassembly(BenchBase):
     10 
     11     mydir = os.path.join("benchmarks", "disassembly")
     12 
     13     def setUp(self):
     14         BenchBase.setUp(self)
     15         self.gdb_41_exe = '/Xcode41/usr/bin/gdb'
     16         self.gdb_42_exe = '/Developer/usr/bin/gdb'
     17         self.exe = self.lldbHere
     18         self.function = 'Driver::MainLoop()'
     19         self.gdb_41_avg = None
     20         self.gdb_42_avg = None
     21         self.count = lldb.bmIterationCount
     22         if self.count <= 0:
     23             self.count = 5
     24 
     25     @benchmarks_test
     26     def test_run_41_then_42(self):
     27         """Test disassembly on a large function with 4.1 vs. 4.2's gdb."""
     28         print
     29         self.run_gdb_disassembly(self.gdb_41_exe, self.exe, self.function, self.count)
     30         print "4.1 gdb benchmark:", self.stopwatch
     31         self.gdb_41_avg = self.stopwatch.avg()
     32         self.run_gdb_disassembly(self.gdb_42_exe, self.exe, self.function, self.count)
     33         print "4.2 gdb benchmark:", self.stopwatch
     34         self.gdb_42_avg = self.stopwatch.avg()
     35         print "gdb_42_avg/gdb_41_avg: %f" % (self.gdb_42_avg/self.gdb_41_avg)
     36 
     37     @benchmarks_test
     38     def test_run_42_then_41(self):
     39         """Test disassembly on a large function with 4.1 vs. 4.2's gdb."""
     40         print
     41         self.run_gdb_disassembly(self.gdb_42_exe, self.exe, self.function, self.count)
     42         print "4.2 gdb benchmark:", self.stopwatch
     43         self.gdb_42_avg = self.stopwatch.avg()
     44         self.run_gdb_disassembly(self.gdb_41_exe, self.exe, self.function, self.count)
     45         print "4.1 gdb benchmark:", self.stopwatch
     46         self.gdb_41_avg = self.stopwatch.avg()
     47         print "gdb_42_avg/gdb_41_avg: %f" % (self.gdb_42_avg/self.gdb_41_avg)
     48 
     49     def run_gdb_disassembly(self, gdb_exe_path, exe, function, count):
     50         # Set self.child_prompt, which is "(gdb) ".
     51         self.child_prompt = '(gdb) '
     52         prompt = self.child_prompt
     53 
     54         # So that the child gets torn down after the test.
     55         self.child = pexpect.spawn('%s --nx %s' % (gdb_exe_path, exe))
     56         child = self.child
     57 
     58         # Turn on logging for what the child sends back.
     59         if self.TraceOn():
     60             child.logfile_read = sys.stdout
     61 
     62         child.expect_exact(prompt)
     63         child.sendline('break %s' % function)
     64         child.expect_exact(prompt)
     65         child.sendline('run')
     66         child.expect_exact(prompt)
     67 
     68         # Reset the stopwatch now.
     69         self.stopwatch.reset()
     70         for i in range(count):
     71             with self.stopwatch:
     72                 # Disassemble the function.
     73                 child.sendline('disassemble')
     74                 child.expect_exact(prompt)
     75             child.sendline('next')
     76             child.expect_exact(prompt)
     77 
     78         child.sendline('quit')
     79         child.expect_exact('The program is running.  Exit anyway?')
     80         child.sendline('y')
     81         try:
     82             self.child.expect(pexpect.EOF)
     83         except:
     84             pass
     85 
     86         if self.TraceOn():
     87             print "gdb disassembly benchmark:", str(self.stopwatch)
     88         self.child = None
     89 
     90 
     91 if __name__ == '__main__':
     92     import atexit
     93     lldb.SBDebugger.Initialize()
     94     atexit.register(lambda: lldb.SBDebugger.Terminate())
     95     unittest2.main()
     96