a7d6c3effe
We want to include events with metadata, like context switches, and this requires the API to handle events with payloads (e.g. information about such context switches). Besides this, we want to support multiple similar events between two consecutive instructions, like multiple context switches. However, the current implementation is not good for this because we are defining events as bitmask enums associated with specific instructions. Thus, we need to decouple instructions from events and make events actual items in the trace, just like instructions and errors. - Add accessors in the TraceCursor to know if an item is an event or not - Modify from the TraceDumper all the way to DecodedThread to support - Renamed the paused event to disabled. - Improved the tsc handling logic. I was using an API for getting the tsc from libipt, but that was an overkill that should be used when not processing events manually, but as we are already processing events, we can more easily get the tscs. event items. Fortunately this simplified many things - As part of this refactor, I also fixed and long stating issue, which is that some non decoding errors were being inserted in the decoded thread. I changed this so that TraceIntelPT::Decode returns an error if the decoder couldn't be set up proplerly. Then, errors within a trace are actual anomalies found in between instrutions. All test pass Differential Revision: https://reviews.llvm.org/D128576
180 lines
6.9 KiB
Python
180 lines
6.9 KiB
Python
import lldb
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from intelpt_testcase import *
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from lldbsuite.test.lldbtest import *
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from lldbsuite.test import lldbutil
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from lldbsuite.test.decorators import *
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class TestTraceStartStop(TraceIntelPTTestCaseBase):
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def expectGenericHelpMessageForStartCommand(self):
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self.expect("help thread trace start",
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substrs=["Syntax: thread trace start [<trace-options>]"])
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@testSBAPIAndCommands
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def testStartStopSessionFileThreads(self):
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# it should fail for processes from json session files
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self.expect("trace load -v " + os.path.join(self.getSourceDir(), "intelpt-trace", "trace.json"))
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# the help command should be the generic one, as it's not a live process
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self.expectGenericHelpMessageForStartCommand()
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self.traceStartThread(error=True)
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self.traceStopThread(error=True)
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@testSBAPIAndCommands
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def testStartWithNoProcess(self):
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self.traceStartThread(error=True)
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@testSBAPIAndCommands
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def testStartSessionWithWrongSize(self):
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self.expect("file " + os.path.join(self.getSourceDir(), "intelpt-trace", "a.out"))
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self.expect("b main")
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self.expect("r")
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self.traceStartThread(
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error=True, iptTraceSize=2000,
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substrs=["The intel pt trace size must be a power of 2", "It was 2000"])
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self.traceStartThread(
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error=True, iptTraceSize=5000,
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substrs=["The intel pt trace size must be a power of 2", "It was 5000"])
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self.traceStartThread(
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error=True, iptTraceSize=0,
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substrs=["The intel pt trace size must be a power of 2", "It was 0"])
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self.traceStartThread(iptTraceSize=1048576)
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@skipIf(oslist=no_match(['linux']), archs=no_match(['i386', 'x86_64']))
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def testSBAPIHelp(self):
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self.expect("file " + os.path.join(self.getSourceDir(), "intelpt-trace", "a.out"))
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self.expect("b main")
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self.expect("r")
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help = self.getTraceOrCreate().GetStartConfigurationHelp()
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self.assertIn("iptTraceSize", help)
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self.assertIn("processBufferSizeLimit", help)
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@skipIf(oslist=no_match(['linux']), archs=no_match(['i386', 'x86_64']))
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def testStoppingAThread(self):
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self.expect("file " + os.path.join(self.getSourceDir(), "intelpt-trace", "a.out"))
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self.expect("b main")
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self.expect("r")
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self.expect("thread trace start")
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self.expect("n")
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self.expect("thread trace dump instructions", substrs=["""0x0000000000400511 movl $0x0, -0x4(%rbp)
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no more data"""])
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# process stopping should stop the thread
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self.expect("process trace stop")
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self.expect("n")
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self.expect("thread trace dump instructions", substrs=["not traced"], error=True)
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@skipIf(oslist=no_match(['linux']), archs=no_match(['i386', 'x86_64']))
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def testStartStopLiveThreads(self):
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# The help command should be the generic one if there's no process running
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self.expectGenericHelpMessageForStartCommand()
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self.expect("thread trace start", error=True,
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substrs=["error: Process not available"])
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self.expect("file " + os.path.join(self.getSourceDir(), "intelpt-trace", "a.out"))
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self.expect("b main")
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self.expect("thread trace start", error=True,
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substrs=["error: Process not available"])
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# The help command should be the generic one if there's still no process running
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self.expectGenericHelpMessageForStartCommand()
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self.expect("r")
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# This fails because "trace start" hasn't been called yet
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self.expect("thread trace stop", error=True,
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substrs=["error: Process is not being traced"])
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# the help command should be the intel-pt one now
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self.expect("help thread trace start",
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substrs=["Start tracing one or more threads with intel-pt.",
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"Syntax: thread trace start [<thread-index> <thread-index> ...] [<intel-pt-options>]"])
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# We start tracing with a small buffer size
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self.expect("thread trace start 1 --size 4096")
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# We fail if we try to trace again
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self.expect("thread trace start", error=True,
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substrs=["error: Thread ", "already traced"])
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# We can reconstruct the single instruction executed in the first line
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self.expect("n")
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self.expect("thread trace dump instructions -f",
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patterns=[f'''thread #1: tid = .*
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a.out`main \+ 4 at main.cpp:2
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0: {ADDRESS_REGEX} movl'''])
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# We can reconstruct the instructions up to the second line
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self.expect("n")
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self.expect("thread trace dump instructions -f",
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patterns=[f'''thread #1: tid = .*
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a.out`main \+ 4 at main.cpp:2
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0: {ADDRESS_REGEX} movl .*
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a.out`main \+ 11 at main.cpp:4
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2: {ADDRESS_REGEX} movl .*
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4: {ADDRESS_REGEX} jmp .* ; <\+28> at main.cpp:4
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6: {ADDRESS_REGEX} cmpl .*
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8: {ADDRESS_REGEX} jle .* ; <\+20> at main.cpp:5'''])
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self.expect("thread trace dump instructions",
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patterns=[f'''thread #1: tid = .*
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a.out`main \+ 32 at main.cpp:4
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8: {ADDRESS_REGEX} jle .* ; <\+20> at main.cpp:5
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6: {ADDRESS_REGEX} cmpl .*
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4: {ADDRESS_REGEX} jmp .* ; <\+28> at main.cpp:4
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2: {ADDRESS_REGEX} movl .*
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a.out`main \+ 4 at main.cpp:2
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0: {ADDRESS_REGEX} movl .* '''])
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# We stop tracing
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self.expect("thread trace stop")
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# We can't stop twice
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self.expect("thread trace stop", error=True,
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substrs=["error: Thread ", "not currently traced"])
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# We trace again from scratch, this time letting LLDB to pick the current
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# thread
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self.expect("thread trace start")
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self.expect("n")
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self.expect("thread trace dump instructions -f",
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patterns=[f'''thread #1: tid = .*
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a.out`main \+ 20 at main.cpp:5
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0: {ADDRESS_REGEX} xorl'''])
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self.expect("thread trace dump instructions",
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patterns=[f'''thread #1: tid = .*
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a.out`main \+ 20 at main.cpp:5
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0: {ADDRESS_REGEX} xorl'''])
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self.expect("c")
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# Now the process has finished, so the commands should fail
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self.expect("thread trace start", error=True,
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substrs=["error: Process must be launched"])
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self.expect("thread trace stop", error=True,
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substrs=["error: Process must be launched"])
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# We should be able to trace the program if we relaunch it
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# For this, we'll trace starting at a different point in the new
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# process.
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self.expect("breakpoint disable")
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self.expect("b main.cpp:4")
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self.expect("r")
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self.expect("thread trace start")
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# We can reconstruct the single instruction executed in the first line
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self.expect("si")
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self.expect("thread trace dump instructions -c 1",
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patterns=[f'''thread #1: tid = .*
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a.out`main \+ 11 at main.cpp:4'''])
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