Add bench.py as a driver script to run some benchmarks on lldb.

Add benchmarks for expression evaluations (TestExpressionCmd.py) and disassembly (TestDoAttachThenDisassembly.py).

An example:
[17:45:55] johnny:/Volumes/data/lldb/svn/trunk/test $ ./bench.py 2>&1 | grep -P '^lldb.*benchmark:'
lldb startup delay (create fresh target) benchmark: Avg: 0.104274 (Laps: 30, Total Elapsed Time: 3.128214)
lldb startup delay (set first breakpoint) benchmark: Avg: 0.102216 (Laps: 30, Total Elapsed Time: 3.066470)
lldb frame variable benchmark: Avg: 1.649162 (Laps: 20, Total Elapsed Time: 32.983245)
lldb stepping benchmark: Avg: 0.104409 (Laps: 50, Total Elapsed Time: 5.220461)
lldb expr cmd benchmark: Avg: 0.206774 (Laps: 25, Total Elapsed Time: 5.169350)
lldb disassembly benchmark: Avg: 0.089086 (Laps: 10, Total Elapsed Time: 0.890859)

llvm-svn: 142708

1 files changed, 66 insertions, 0 deletions

diff --git a/lldb/test/benchmarks/disassembly/TestDoAttachThenDisassembly.py b/lldb/test/benchmarks/disassembly/TestDoAttachThenDisassembly.py
new file mode 100644
index 00000000000..90cf7a87cae
--- /dev/null
+++ b/lldb/test/benchmarks/disassembly/TestDoAttachThenDisassembly.py
@@ -0,0 +1,66 @@
+"""Test lldb's disassemblt speed."""
+
+import os, sys
+import unittest2
+import lldb
+import pexpect
+from lldbbench import *
+
+class AttachThenDisassemblyBench(BenchBase):
+
+    mydir = os.path.join("benchmarks", "disassembly")
+
+    def setUp(self):
+        BenchBase.setUp(self)
+
+    @benchmarks_test
+    def test_attach_then_disassembly(self):
+        """Attach to a spawned lldb process then run disassembly benchmarks."""
+        print
+        self.run_lldb_attach_then_disassembly(10)
+        print "lldb disassembly benchmark:", self.stopwatch
+
+    def run_lldb_attach_then_disassembly(self, count):
+        target = self.dbg.CreateTarget(self.lldbHere)
+
+        # Spawn a new process and don't display the stdout if not in TraceOn() mode.
+        import subprocess
+        popen = subprocess.Popen([self.lldbHere, self.lldbOption],
+                                 stdout = open(os.devnull, 'w') if not self.TraceOn() else None)
+        if self.TraceOn():
+            print "pid of spawned process: %d" % popen.pid
+
+        # Attach to the launched lldb process.
+        listener = lldb.SBListener("my.attach.listener")
+        error = lldb.SBError()
+        process = target.AttachToProcessWithID(listener, popen.pid, error)
+
+        # Set thread0 as the selected thread, followed by the 'MainLoop' frame
+        # as the selected frame.  Then do disassembly on the function.
+        thread0 = process.GetThreadAtIndex(0)
+        process.SetSelectedThread(thread0)
+        i = 0
+        found = False
+        for f in thread0:
+            #print "frame#%d %s" % (i, f.GetFunctionName())
+            if "MainLoop" in f.GetFunctionName():
+                found = True
+                thread0.SetSelectedFrame(i)
+                if self.TraceOn():
+                    print "Found frame#%d for function 'MainLoop'" % i
+                break
+            i += 1
+            
+        # Reset the stopwatch now.
+        self.stopwatch.reset()
+        for i in range(count):
+            with self.stopwatch:
+                # Disassemble the function.
+                self.runCmd("disassemble -f")
+
+
+if __name__ == '__main__':
+    import atexit
+    lldb.SBDebugger.Initialize()
+    atexit.register(lambda: lldb.SBDebugger.Terminate())
+    unittest2.main()