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import lldb
import json
from intelpt_testcase import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
from lldbsuite.test.decorators import *
def find(predicate, seq):
for item in seq:
if predicate(item):
return item
class TestTraceSave(TraceIntelPTTestCaseBase):
def testErrorMessages(self):
# We first check the output when there are no targets
self.expect(
"trace save",
substrs=[
"error: invalid target, create a target using the 'target create' command"
],
error=True,
)
# We now check the output when there's a non-running target
self.expect(
"target create "
+ os.path.join(self.getSourceDir(), "intelpt-trace", "a.out")
)
self.expect(
"trace save",
substrs=["error: Command requires a current process."],
error=True,
)
# Now we check the output when there's a running target without a trace
self.expect("b main")
self.expect("run")
self.expect(
"trace save", substrs=["error: Process is not being traced"], error=True
)
@skipIfNoIntelPT
def testSaveToInvalidDir(self):
self.expect(
"target create "
+ os.path.join(self.getSourceDir(), "intelpt-trace", "a.out")
)
self.expect("b main")
self.expect("r")
self.expect("thread trace start")
self.expect("n")
# Check the output when saving without providing the directory argument
self.expect(
"trace save ",
substrs=[
"error: a single path to a directory where the trace bundle will be created is required"
],
error=True,
)
# Check the output when saving to an invalid directory
self.expect(
"trace save /", substrs=["error: couldn't write to the file"], error=True
)
def testSaveWhenNotLiveTrace(self):
self.expect(
"trace load -v "
+ os.path.join(self.getSourceDir(), "intelpt-trace", "trace.json"),
substrs=["intel-pt"],
)
# Check the output when not doing live tracing
self.expect(
"trace save "
+ os.path.join(self.getBuildDir(), "intelpt-trace", "trace_not_live_dir")
)
def testSaveMultiCpuTrace(self):
"""
This test starts a per-cpu tracing session, then saves the session to disk, and
finally it loads it again.
"""
self.skipIfPerCpuTracingIsNotSupported()
self.expect(
"target create "
+ os.path.join(self.getSourceDir(), "intelpt-trace", "a.out")
)
self.expect("b main")
self.expect("r")
self.expect("process trace start --per-cpu-tracing")
self.expect("b 7")
output_dir = os.path.join(self.getBuildDir(), "intelpt-trace", "trace_save")
self.expect("trace save " + output_dir)
def checkSessionBundle(session_file_path):
with open(session_file_path) as session_file:
session = json.load(session_file)
# We expect tsc conversion info
self.assertIn("tscPerfZeroConversion", session)
# We expect at least one cpu
self.assertGreater(len(session["cpus"]), 0)
# We expect the required trace files to be created
for cpu in session["cpus"]:
cpu_files_prefix = os.path.join(output_dir, "cpus", str(cpu["id"]))
self.assertTrue(os.path.exists(cpu_files_prefix + ".intelpt_trace"))
self.assertTrue(
os.path.exists(cpu_files_prefix + ".perf_context_switch_trace")
)
# We expect at least one one process
self.assertGreater(len(session["processes"]), 0)
for process in session["processes"]:
# We expect at least one thread
self.assertGreater(len(process["threads"]), 0)
# We don't expect thread traces
for thread in process["threads"]:
self.assertTrue(
("iptTrace" not in thread) or (thread["iptTrace"] is None)
)
original_trace_session_file = os.path.join(output_dir, "trace.json")
checkSessionBundle(original_trace_session_file)
output_dir = os.path.join(self.getBuildDir(), "intelpt-trace", "trace_save")
self.expect("trace load " + os.path.join(output_dir, "trace.json"))
output_copy_dir = os.path.join(
self.getBuildDir(), "intelpt-trace", "copy_trace_save"
)
self.expect("trace save " + output_copy_dir)
# We now check that the new bundle is correct on its own
copied_trace_session_file = os.path.join(output_copy_dir, "trace.json")
checkSessionBundle(copied_trace_session_file)
# We finally check that the new bundle has the same information as the original one
with open(original_trace_session_file) as original_file:
original = json.load(original_file)
with open(copied_trace_session_file) as copy_file:
copy = json.load(copy_file)
self.assertEqual(len(original["processes"]), len(copy["processes"]))
for process in original["processes"]:
copied_process = find(
lambda proc: proc["pid"] == process["pid"], copy["processes"]
)
self.assertIsNotNone(copied_process)
for thread in process["threads"]:
copied_thread = find(
lambda thr: thr["tid"] == thread["tid"],
copied_process["threads"],
)
self.assertIsNotNone(copied_thread)
for cpu in original["cpus"]:
copied_cpu = find(lambda cor: cor["id"] == cpu["id"], copy["cpus"])
self.assertIsNotNone(copied_cpu)
@skipIfNoIntelPT
def testSaveTrace(self):
self.expect(
"target create "
+ os.path.join(self.getSourceDir(), "intelpt-trace", "a.out")
)
self.expect("b main")
self.expect("r")
self.expect("thread trace start")
self.expect("b 7")
ci = self.dbg.GetCommandInterpreter()
res = lldb.SBCommandReturnObject()
ci.HandleCommand("thread trace dump instructions -c 10 --forwards", res)
self.assertTrue(res.Succeeded())
first_ten_instructions = res.GetOutput()
ci.HandleCommand("thread trace dump instructions -c 10", res)
self.assertTrue(res.Succeeded())
last_ten_instructions = res.GetOutput()
# Now, save the trace to <trace_copy_dir>
self.expect(
"trace save "
+ os.path.join(self.getBuildDir(), "intelpt-trace", "trace_copy_dir")
)
# Load the trace just saved
self.expect(
"trace load -v "
+ os.path.join(
self.getBuildDir(), "intelpt-trace", "trace_copy_dir", "trace.json"
),
substrs=["intel-pt"],
)
# Compare with instructions saved at the first time
ci.HandleCommand("thread trace dump instructions -c 10 --forwards", res)
self.assertTrue(res.Succeeded())
self.assertEqual(res.GetOutput(), first_ten_instructions)
ci.HandleCommand("thread trace dump instructions -c 10", res)
self.assertTrue(res.Succeeded())
self.assertEqual(res.GetOutput(), last_ten_instructions)
def testSaveKernelTrace(self):
original_trace_file = os.path.join(
self.getSourceDir(), "intelpt-kernel-trace", "trace.json"
)
copied_trace_dir = os.path.join(self.getBuildDir(), "intelpt-kernel-trace")
copied_trace_file = os.path.join(copied_trace_dir, "trace.json")
self.expect("trace load -v " + original_trace_file, substrs=["intel-pt"])
self.expect("trace save " + copied_trace_dir)
# We finally check that the new json has the same information as the original one
with open(original_trace_file) as original_file:
original_file = json.load(original_file)
with open(copied_trace_file) as copy_file:
copy_file = json.load(copy_file)
self.assertIn("kernel", copy_file)
self.assertEqual(
os.path.basename(original_file["kernel"]["file"]),
os.path.basename(copy_file["kernel"]["file"]),
)
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