src/llvm-project/lldb/test/API/benchmarks/startup/TestStartupDelays.py

"""Test lldb's startup delays creating a target, setting a breakpoint, and run to breakpoint stop."""

import sys
import lldb
from lldbsuite.test import configuration
from lldbsuite.test import lldbtest_config
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbbench import *


class StartupDelaysBench(BenchBase):
    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()
        # Create self.stopwatch3 for measuring "run to breakpoint".
        self.stopwatch3 = Stopwatch()
        self.exe = lldbtest_config.lldbExec
        self.break_spec = "-n main"
        self.count = 30

    @benchmarks_test
    @no_debug_info_test
    @expectedFailureAll(
        oslist=["windows"],
        bugnumber="llvm.org/pr22274: need a pexpect replacement for windows",
    )
    def test_startup_delay(self):
        """Test start up delays creating a target, setting a breakpoint, and run to breakpoint stop."""
        print()
        self.run_startup_delays_bench(self.exe, self.break_spec, self.count)
        print("lldb startup delay (create fresh target) benchmark:", self.stopwatch)
        print("lldb startup delay (set first breakpoint) benchmark:", self.stopwatch2)
        print("lldb startup delay (run to breakpoint) benchmark:", self.stopwatch3)

    def run_startup_delays_bench(self, exe, break_spec, count):
        import pexpect

        # 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" % (lldbtest_config.lldbExec, 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)

            with self.stopwatch3:
                # Run to the breakpoint just set.
                child.sendline("run")
                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