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
162 lines
7.1 KiB
Python
162 lines
7.1 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 TestTraceLoad(TraceIntelPTTestCaseBase):
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NO_DEBUG_INFO_TESTCASE = True
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@testSBAPIAndCommands
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def testLoadMultiCoreTrace(self):
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src_dir = self.getSourceDir()
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trace_description_file_path = os.path.join(src_dir, "intelpt-multi-core-trace", "trace.json")
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, substrs=["intel-pt"])
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self.expect("thread trace dump instructions 2 -t",
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substrs=["19522: [tsc=40450075478109270] (error) expected tracing enabled event",
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"m.out`foo() + 65 at multi_thread.cpp:12:21",
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"19520: [tsc=40450075477657246] 0x0000000000400ba7 jg 0x400bb3"])
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self.expect("thread trace dump instructions 3 -t",
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substrs=["67911: [tsc=40450075477799536] 0x0000000000400bd7 addl $0x1, -0x4(%rbp)",
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"m.out`bar() + 26 at multi_thread.cpp:20:6"])
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@testSBAPIAndCommands
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def testLoadMultiCoreTraceWithStringNumbers(self):
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src_dir = self.getSourceDir()
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trace_description_file_path = os.path.join(src_dir, "intelpt-multi-core-trace", "trace_with_string_numbers.json")
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, substrs=["intel-pt"])
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self.expect("thread trace dump instructions 2 -t",
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substrs=["19522: [tsc=40450075478109270] (error) expected tracing enabled event",
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"m.out`foo() + 65 at multi_thread.cpp:12:21",
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"19520: [tsc=40450075477657246] 0x0000000000400ba7 jg 0x400bb3"])
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self.expect("thread trace dump instructions 3 -t",
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substrs=["67911: [tsc=40450075477799536] 0x0000000000400bd7 addl $0x1, -0x4(%rbp)",
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"m.out`bar() + 26 at multi_thread.cpp:20:6"])
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@testSBAPIAndCommands
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def testLoadMultiCoreTraceWithMissingThreads(self):
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src_dir = self.getSourceDir()
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trace_description_file_path = os.path.join(src_dir, "intelpt-multi-core-trace", "trace_missing_threads.json")
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, substrs=["intel-pt"])
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self.expect("thread trace dump instructions 3 -t",
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substrs=["19522: [tsc=40450075478109270] (error) expected tracing enabled event",
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"m.out`foo() + 65 at multi_thread.cpp:12:21",
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"19520: [tsc=40450075477657246] 0x0000000000400ba7 jg 0x400bb3"])
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self.expect("thread trace dump instructions 2 -t",
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substrs=["67911: [tsc=40450075477799536] 0x0000000000400bd7 addl $0x1, -0x4(%rbp)",
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"m.out`bar() + 26 at multi_thread.cpp:20:6"])
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@testSBAPIAndCommands
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def testLoadTrace(self):
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src_dir = self.getSourceDir()
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trace_description_file_path = os.path.join(src_dir, "intelpt-trace", "trace.json")
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, substrs=["intel-pt"])
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target = self.dbg.GetSelectedTarget()
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process = target.GetProcess()
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self.assertEqual(process.GetProcessID(), 1234)
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self.assertEqual(process.GetNumThreads(), 1)
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self.assertEqual(process.GetThreadAtIndex(0).GetThreadID(), 3842849)
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self.assertEqual(target.GetNumModules(), 1)
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module = target.GetModuleAtIndex(0)
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path = module.GetFileSpec()
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self.assertEqual(path.fullpath, os.path.join(src_dir, "intelpt-trace", "a.out"))
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self.assertGreater(module.GetNumSections(), 0)
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self.assertEqual(module.GetSectionAtIndex(0).GetFileAddress(), 0x400000)
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self.assertEqual("6AA9A4E2-6F28-2F33-377D-59FECE874C71-5B41261A", module.GetUUIDString())
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# check that the Process and Thread objects were created correctly
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self.expect("thread info", substrs=["tid = 3842849"])
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self.expect("thread list", substrs=["Process 1234 stopped", "tid = 3842849"])
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self.expect("thread trace dump info", substrs=['''Trace technology: intel-pt
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thread #1: tid = 3842849
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Total number of trace items: 23
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Memory usage:
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Raw trace size: 4 KiB
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Total approximate memory usage (excluding raw trace): 0.20 KiB
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Average memory usage per item (excluding raw trace): 9.00 bytes
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Timing for this thread:
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Decoding instructions: ''', '''
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Events:
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Number of individual events: 2
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software disabled tracing: 2
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Errors:
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Number of TSC decoding errors: 0'''])
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@testSBAPIAndCommands
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def testLoadInvalidTraces(self):
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src_dir = self.getSourceDir()
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# We test first an invalid type
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trace_description_file_path = os.path.join(src_dir, "intelpt-trace", "trace_bad.json")
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expected_substrs = ['''error: expected object at traceBundle.processes[0]
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Context:
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{
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"cpuInfo": { ... },
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"processes": [
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/* error: expected object */
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123
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],
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"type": "intel-pt"
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}
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Schema:
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{
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"type": "intel-pt",
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"cpuInfo": {
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// CPU information gotten from, for example, /proc/cpuinfo.
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"vendor": "GenuineIntel" | "unknown",
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"family": integer,
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"model": integer,
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"stepping": integer
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},''']
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, error=True, substrs=expected_substrs)
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# Now we test a wrong cpu family field in the global bundle description file
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trace_description_file_path = os.path.join(src_dir, "intelpt-trace", "trace_bad2.json")
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expected_substrs = ['error: expected uint64_t at traceBundle.cpuInfo.family', "Context", "Schema"]
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, error=True, substrs=expected_substrs)
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# Now we test a missing field in the intel-pt settings
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trace_description_file_path = os.path.join(src_dir, "intelpt-trace", "trace_bad4.json")
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expected_substrs = ['''error: missing value at traceBundle.cpuInfo.family
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Context:
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{
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"cpuInfo": /* error: missing value */ {
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"model": 79,
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"stepping": 1,
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"vendor": "GenuineIntel"
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},
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"processes": [],
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"type": "intel-pt"
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}''', "Schema"]
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, error=True, substrs=expected_substrs)
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# Now we test an incorrect load address in the intel-pt settings
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trace_description_file_path = os.path.join(src_dir, "intelpt-trace", "trace_bad5.json")
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expected_substrs = ['error: missing value at traceBundle.processes[1].pid', "Schema"]
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, error=True, substrs=expected_substrs)
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# The following wrong schema will have a valid target and an invalid one. In the case of failure,
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# no targets should be created.
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self.assertEqual(self.dbg.GetNumTargets(), 0)
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trace_description_file_path = os.path.join(src_dir, "intelpt-trace", "trace_bad3.json")
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expected_substrs = ['error: missing value at traceBundle.processes[1].pid']
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self.traceLoad(traceDescriptionFilePath=trace_description_file_path, error=True, substrs=expected_substrs)
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self.assertEqual(self.dbg.GetNumTargets(), 0)
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