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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 *
@skipIfNoIntelPT
class TestTraceStartStopMultipleThreads(TraceIntelPTTestCaseBase):
@skipIf(oslist=no_match(["linux"]), archs=no_match(["i386", "x86_64"]))
@testSBAPIAndCommands
def testStartMultipleLiveThreads(self):
self.build()
exe = self.getBuildArtifact("a.out")
self.dbg.CreateTarget(exe)
self.expect("b main")
self.expect("b 6")
self.expect("b 11")
self.expect("r")
self.traceStartProcess()
self.expect("continue")
self.expect("thread trace dump instructions", substrs=["main.cpp:9"])
# We'll see here the second thread
self.expect("continue")
self.expect("thread trace dump instructions", substrs=["main.cpp:4"])
self.traceStopProcess()
@skipIf(oslist=no_match(["linux"]), archs=no_match(["i386", "x86_64"]))
@testSBAPIAndCommands
def testStartMultipleLiveThreadsWithStops(self):
self.build()
exe = self.getBuildArtifact("a.out")
self.dbg.CreateTarget(exe)
self.expect("b main")
self.expect("b 6")
self.expect("b 11")
self.expect("r")
self.traceStartProcess()
# We'll see here the first thread
self.expect("continue")
# We are in thread 2
self.expect("thread trace dump instructions", substrs=["main.cpp:9"])
self.expect("thread trace dump instructions 2", substrs=["main.cpp:9"])
# We stop tracing all
self.expect("thread trace stop all")
# The trace is still in memory
self.expect("thread trace dump instructions 2", substrs=["main.cpp:9"])
# We'll stop at the next breakpoint in thread 3, thread 2 and 3 will be alive, but only 3 traced.
self.expect("continue")
self.expect("thread trace dump instructions", substrs=["main.cpp:4"])
self.expect("thread trace dump instructions 3", substrs=["main.cpp:4"])
self.expect(
"thread trace dump instructions 1", substrs=["not traced"], error=True
)
self.expect(
"thread trace dump instructions 2", substrs=["not traced"], error=True
)
self.traceStopProcess()
@skipIf(oslist=no_match(["linux"]), archs=no_match(["i386", "x86_64"]))
def testStartMultipleLiveThreadsWithThreadStartAll(self):
self.build()
exe = self.getBuildArtifact("a.out")
target = self.dbg.CreateTarget(exe)
self.expect("b main")
self.expect("b 6")
self.expect("b 11")
self.expect("r")
self.expect("continue")
# We are in thread 2
self.expect("thread trace start all")
# Now we have instructions in thread's 2 trace
self.expect("n")
self.expect("thread trace dump instructions 2", substrs=["main.cpp:11"])
# We stop tracing all
self.runCmd("thread trace stop all")
# The trace is still in memory
self.expect("thread trace dump instructions 2", substrs=["main.cpp:11"])
# We'll stop at the next breakpoint in thread 3, and nothing should be traced
self.expect("continue")
self.expect(
"thread trace dump instructions 3", substrs=["not traced"], error=True
)
self.expect(
"thread trace dump instructions 1", substrs=["not traced"], error=True
)
self.expect(
"thread trace dump instructions 2", substrs=["not traced"], error=True
)
@skipIf(oslist=no_match(["linux"]), archs=no_match(["i386", "x86_64"]))
@testSBAPIAndCommands
def testStartMultipleLiveThreadsWithSmallTotalLimit(self):
self.build()
exe = self.getBuildArtifact("a.out")
self.dbg.CreateTarget(exe)
self.expect("b main")
self.expect("r")
# trace the entire process with enough total size for 1 thread trace
self.traceStartProcess(processBufferSizeLimit=5000)
# we get the stop event when trace 2 appears and can't be traced
self.expect("c", substrs=["Thread", "can't be traced"])
# we get the stop event when trace 3 appears and can't be traced
self.expect("c", substrs=["Thread", "can't be traced"])
self.traceStopProcess()
@skipIf(oslist=no_match(["linux"]), archs=no_match(["i386", "x86_64"]))
@testSBAPIAndCommands
def testStartPerCpuSession(self):
self.skipIfPerCpuTracingIsNotSupported()
self.build()
exe = self.getBuildArtifact("a.out")
self.dbg.CreateTarget(exe)
self.expect("b main")
self.expect("r")
# We should fail if we hit the total buffer limit. Useful if the number
# of cpus is huge.
self.traceStartProcess(
error="True",
processBufferSizeLimit=100,
perCpuTracing=True,
substrs=[
"The process can't be traced because the process trace size "
"limit has been reached. Consider retracing with a higher limit."
],
)
self.traceStartProcess(perCpuTracing=True)
self.traceStopProcess()
self.traceStartProcess(perCpuTracing=True)
# We can't support multiple per-cpu tracing sessions.
self.traceStartProcess(
error=True,
perCpuTracing=True,
substrs=["Process currently traced. Stop process tracing first"],
)
# We can't support tracing per thread is per cpu is enabled.
self.traceStartThread(
error="True", substrs=["Thread with tid ", "is currently traced"]
)
# We can't stop individual thread when per cpu is enabled.
self.traceStopThread(
error="True",
substrs=[
"Can't stop tracing an individual thread when per-cpu process tracing is enabled"
],
)
# We move forward a little bit to collect some data
self.expect("b 19")
self.expect("c")
# We will assert that the trace state will contain valid context switch and intel pt trace buffer entries.
# Besides that, we need to get tsc-to-nanos conversion information.
# We first parse the json response from the custom packet
self.runCmd(
"""process plugin packet send 'jLLDBTraceGetState:{"type":"intel-pt"}]'"""
)
response_header = "response: "
output = None
for line in self.res.GetOutput().splitlines():
if line.find(response_header) != -1:
response = line[
line.find(response_header) + len(response_header) :
].strip()
output = json.loads(response)
self.assertIsNotNone(output)
self.assertIn("cpus", output)
self.assertIn("tscPerfZeroConversion", output)
found_non_empty_context_switch = False
for cpu in output["cpus"]:
context_switch_size = None
ipt_trace_size = None
for binary_data in cpu["binaryData"]:
if binary_data["kind"] == "iptTrace":
ipt_trace_size = binary_data["size"]
elif binary_data["kind"] == "perfContextSwitchTrace":
context_switch_size = binary_data["size"]
self.assertIsNotNone(context_switch_size)
self.assertIsNotNone(ipt_trace_size)
if context_switch_size > 0:
found_non_empty_context_switch = True
# We must have captured the context switch of when the target resumed
self.assertTrue(found_non_empty_context_switch)
self.expect("thread trace dump instructions")
self.traceStopProcess()
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