5953532615
debugserver on arm64 devices can manage both Byte Address Select watchpoints (1-8 bytes) and MASK watchpoints (8 bytes-2 gigabytes). This adds a SupportedWatchpointTypes key to the QSupported response from debugserver with a list of these, so lldb can take full advantage of them when creating larger regions with a single hardware watchpoint. Also add documentation for this, and two other lldb extensions, to the lldb-gdb-remote.txt documentation. Re-enable TestLargeWatchpoint.py on Darwin systems when testing with the in-tree built debugserver. I can remove the "in-tree built debugserver" in the future when this new key is handled by an Xcode debugserver.
64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
"""
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Watch larger-than-8-bytes regions of memory, confirm that
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writes to those regions are detected.
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"""
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import lldb
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from lldbsuite.test.decorators import *
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from lldbsuite.test.lldbtest import *
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from lldbsuite.test import lldbutil
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class UnalignedWatchpointTestCase(TestBase):
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def continue_and_report_stop_reason(self, process, iter_str):
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process.Continue()
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self.assertIn(
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process.GetState(), [lldb.eStateStopped, lldb.eStateExited], iter_str
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)
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thread = process.GetSelectedThread()
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return thread.GetStopReason()
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NO_DEBUG_INFO_TESTCASE = True
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# debugserver on AArch64 has this feature.
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@skipIf(archs=no_match(["arm64", "arm64e", "aarch64"]))
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@skipUnlessDarwin
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# debugserver only gained the ability to watch larger regions
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# with this patch.
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@skipIfOutOfTreeDebugserver
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def test_large_watchpoint(self):
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"""Test watchpoint that covers a large region of memory."""
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self.build()
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self.main_source_file = lldb.SBFileSpec("main.c")
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(target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(
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self, "break here", self.main_source_file
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)
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frame = thread.GetFrameAtIndex(0)
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array_addr = frame.GetValueForVariablePath("array").GetValueAsUnsigned()
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# watch 256 uint32_t elements in the middle of the array,
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# don't assume that the heap allocated array is aligned
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# to a 1024 byte boundary to begin with, force alignment.
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wa_256_addr = (array_addr + 1024) & ~(1024 - 1)
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err = lldb.SBError()
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wp_opts = lldb.SBWatchpointOptions()
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wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify)
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wp = target.WatchpointCreateByAddress(wa_256_addr, 1024, wp_opts, err)
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self.assertTrue(wp.IsValid())
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self.assertSuccess(err)
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c_count = 0
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reason = self.continue_and_report_stop_reason(process, "continue #%d" % c_count)
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while reason == lldb.eStopReasonWatchpoint:
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c_count = c_count + 1
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reason = self.continue_and_report_stop_reason(
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process, "continue #%d" % c_count
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)
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self.assertLessEqual(c_count, 16)
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self.assertEqual(c_count, 16)
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