05b4bf2571
In order to support quick arbitrary access to instructions in the trace, we need each instruction to have an id. It could be an index or any other value that the trace plugin defines. This will be useful for reverse debugging or for creating callstacks, as each frame will need an instruction id associated with them. I've updated the `thread trace dump instructions` command accordingly. It now prints the instruction id instead of relative offset. I've also added a new --id argument that allows starting the dump from an arbitrary position. Differential Revision: https://reviews.llvm.org/D122254
182 lines
6.9 KiB
Python
182 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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mydir = TestBase.compute_mydir(__file__)
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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, threadBufferSize=2000,
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substrs=["The trace buffer size must be a power of 2", "It was 2000"])
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self.traceStartThread(
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error=True, threadBufferSize=5000,
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substrs=["The trace buffer size must be a power of 2", "It was 5000"])
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self.traceStartThread(
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error=True, threadBufferSize=0,
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substrs=["The trace buffer size must be a power of 2", "It was 0"])
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self.traceStartThread(threadBufferSize=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("threadBufferSize", 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"])
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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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1: {ADDRESS_REGEX} movl .*
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2: {ADDRESS_REGEX} jmp .* ; <\+28> at main.cpp:4
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3: {ADDRESS_REGEX} cmpl .*
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4: {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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4: {ADDRESS_REGEX} jle .* ; <\+20> at main.cpp:5
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3: {ADDRESS_REGEX} cmpl .*
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2: {ADDRESS_REGEX} jmp .* ; <\+28> at main.cpp:4
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1: {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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