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(#177610)
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I noticed that LLDB takes longer to stop than it should. Running a tiny
program like `int main() { return 0; }` in LLDB with `lldb test.exe -o r
-o q` takes about five seconds.
This is caused by the `WaitForMultipleObjects` in
[`ConnectionGenericFile::Read`](https://github.com/llvm/llvm-project/blob/25976e83606f1a7615e3725e6038bb53ee96c3d5/lldb/source/Host/windows/ConnectionGenericFileWindows.cpp#L191-L192)
timing out (it has a timeout of 5s).
It times out, because we never close the PTY created in
[`ProcessLaunchInfo::SetUpPtyRedirection`](https://github.com/llvm/llvm-project/blob/25976e83606f1a7615e3725e6038bb53ee96c3d5/lldb/source/Host/common/ProcessLaunchInfo.cpp#L213).
When we call `target->GetProcessLaunchInfo().GetPTY().Close()` in
`ProcessWindows::OnExitProcess`, we don't access the PTY we created when
setting up the redirection - we're closing a default constructed one.
This is because the target's `m_launch_info` isn't necessarily the
`launch_info` we get in
[`Target::FinalizeFileActions`](https://github.com/llvm/llvm-project/blob/4a8a0593bdecee49331cb5c31a6c9b18d87ea41c/lldb/source/Target/Target.cpp#L3850)
when calling `SetUpPtyRedirection`.
With this PR, we store the PTY that a process was launched with inside
`ProcessWindows`, so we can later close it.
The wait of five seconds and a timed out `WaitForMultipleObjects` sounds
similar to https://github.com/llvm/llvm-project/pull/159308, but it's a
different call to `WaitForMultipleObjects` here. Still, I wonder if we
could do something to detect this earlier. Maybe some warning message or
debug-only assert if these waits time out?
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This patch is a follow up to
https://github.com/llvm/llvm-project/pull/170471.
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all targets (#159308)
When quitting LLDB on Windows while a process was still running, LLDB
would take unusually long to exit. This was due to a temporary deadlock:
The main thread was destroying the processes. In doing so, it iterated
over the target list:
https://github.com/llvm/llvm-project/blob/88c64f76ed2ca226da99b99f60d316b1519fc7d8/lldb/source/Core/Debugger.cpp#L1095-L1098
This locks the list for the whole iteration. Finalizing the process
would eventually lead to `DebuggerThread::StopDebugging`, which
terminates the process and waits for it to exit:
https://github.com/llvm/llvm-project/blob/88c64f76ed2ca226da99b99f60d316b1519fc7d8/lldb/source/Plugins/Process/Windows/Common/DebuggerThread.cpp#L196
The debugger loop (on a separate thread) would see that the process
exited and call
[`ProcessWindows::OnExitProcess`](https://github.com/llvm/llvm-project/blob/88c64f76ed2ca226da99b99f60d316b1519fc7d8/lldb/source/Plugins/Process/Windows/Common/ProcessWindows.cpp#L656-L673).
This calls the static function
[`Process::SetProcessExitStatus`](https://github.com/llvm/llvm-project/blob/0a7a7d56fc882653335beba0d1f8ea9f26089c22/lldb/source/Target/Process.cpp#L1098-L1126).
This tries to find the process by its ID from the debugger's target
list. Doing so requires locking the list, so the debugger thread would
then be stuck on
https://github.com/llvm/llvm-project/blob/0a7a7d56fc882653335beba0d1f8ea9f26089c22/lldb/source/Target/TargetList.cpp#L403
After 5s, the main thread would give up waiting. So every exit where the
process was still running would be delayed by about 5s.
Since `ProcessWindows` would find itself when calling
`SetProcessExitStatus`, we can call `SetExitStatus` directly.
This can also make some tests run faster. For example, the DIA PDB tests
previously took 15s to run on my PC (24 jobs) and now take 5s. For all
shell tests, the difference isn't that big (only about 3s), because most
don't run into this and the tests run in parallel.
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If we're not touching them, we don't need to do anything special to pass
them along -- with one important caveat: due to how cmake arguments
work, the implicitly passed arguments need to be specified before
arguments that we handle.
This isn't particularly nice, but the alternative is enumerating all
arguments that can be used by llvm_add_library and the macros it calls
(it also relies on implicit passing of some arguments to
llvm_process_sources).
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& few other files (#141478)
A few files of lldb dir & few other files had duplicate headers
included. This patch removes those redundancies.
---------
Co-authored-by: Akash Agrawal <akashag@qti.qualcomm.com>
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When running a process that would exit before LLDB could stop the
target, it would try to interpret (and subsequently format) the exit
code as a Win32 error. However, processes on Windows won't return Win32
errors in that case. They will often return an
[NTSTATUS](https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/596a1078-e883-4972-9bbc-49e60bebca55).
One common case for this to occur is when a DLL is missing. In that
case, the process will start successfully, but it will exit with
`STATUS_DLL_NOT_FOUND`.
LLDB would previously return "unknown error", because it tried to
[`FormatMessage`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-formatmessage)
`0xC0000135` which doesn't work, so it fell back to "unknown error".
This PR changes the error to be the string "Process prematurely exited
with {0:x}" and doesn't try to format the exit code. One could
`FormatMessage` an `NTSTATUS` by passing `FORMAT_MESSAGE_FROM_HMODULE`
and a handle to `ntdll.dll`, however, I don't think we can get the
required format arguments (e.g. the missing DLL name - `%hs`).
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Errors will get "error:" prefixes automatically so this is not needed.
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The new test added in https://github.com/llvm/llvm-project/pull/132783
was failing on Windows because it created a new error to say it did not
support the feature, but then returned the existing, default constructed
error. Which was a success value.
This also changes the GDBRemote error message to the same phrasing used
in all the other places so we don't have to special case any platform.
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`llvm::convertUTF16ToUTF8String` opens with an assertion that the output
container is empty:
https://github.com/llvm/llvm-project/blob/3bdf9a08804a5b424fd32fef3b0089f3a6db839d/llvm/lib/Support/ConvertUTFWrapper.cpp#L83-L84
It's not clear to me why this function requires the output container to
be empty instead of just overwriting it, but the callsite in
`TargetThreadWindows::GetName` may reuse the container without clearing
it out first, resulting in an assertion failure:
```
# Child-SP RetAddr Call Site
00 000000d2`44b8ea48 00007ff8`beefc12e ntdll!NtTerminateProcess+0x14
01 000000d2`44b8ea50 00007ff8`bcf518ab ntdll!RtlExitUserProcess+0x11e
02 000000d2`44b8ea80 00007ff8`bc0e0143 KERNEL32!ExitProcessImplementation+0xb
03 000000d2`44b8eab0 00007ff8`bc0e4c49 ucrtbase!common_exit+0xc7
04 000000d2`44b8eb10 00007ff8`bc102ae6 ucrtbase!abort+0x69
05 000000d2`44b8eb40 00007ff8`bc102cc1 ucrtbase!common_assert_to_stderr<wchar_t>+0x6e
06 000000d2`44b8eb80 00007fff`b8e27a80 ucrtbase!wassert+0x71
07 000000d2`44b8ebb0 00007fff`b8b821e1 liblldb!llvm::convertUTF16ToUTF8String+0x30 [D:\r\_work\swift-build\swift-build\SourceCache\llvm-project\llvm\lib\Support\ConvertUTFWrapper.cpp @ 88]
08 000000d2`44b8ec30 00007fff`b83e9aa2 liblldb!lldb_private::TargetThreadWindows::GetName+0x1b1 [D:\r\_work\swift-build\swift-build\SourceCache\llvm-project\lldb\source\Plugins\Process\Windows\Common\TargetThreadWindows.cpp @ 198]
09 000000d2`44b8eca0 00007ff7`2a3c3c14 liblldb!lldb::SBThread::GetName+0x102 [D:\r\_work\swift-build\swift-build\SourceCache\llvm-project\lldb\source\API\SBThread.cpp @ 432]
0a 000000d2`44b8ed70 00007ff7`2a3a5ac6 lldb_dap!lldb_dap::CreateThread+0x1f4 [S:\SourceCache\llvm-project\lldb\tools\lldb-dap\JSONUtils.cpp @ 877]
0b 000000d2`44b8ef10 00007ff7`2a3b0ab5 lldb_dap!`anonymous namespace'::request_threads+0xa6 [S:\SourceCache\llvm-project\lldb\tools\lldb-dap\lldb-dap.cpp @ 3906]
0c 000000d2`44b8f010 00007ff7`2a3b0fe8 lldb_dap!lldb_dap::DAP::HandleObject+0x1c5 [S:\SourceCache\llvm-project\lldb\tools\lldb-dap\DAP.cpp @ 796]
0d 000000d2`44b8f130 00007ff7`2a3a8b96 lldb_dap!lldb_dap::DAP::Loop+0x78 [S:\SourceCache\llvm-project\lldb\tools\lldb-dap\DAP.cpp @ 812]
0e 000000d2`44b8f1d0 00007ff7`2a4b5fbc lldb_dap!main+0x1096 [S:\SourceCache\llvm-project\lldb\tools\lldb-dap\lldb-dap.cpp @ 5319]
0f (Inline Function) --------`-------- lldb_dap!invoke_main+0x22 [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl @ 78]
10 000000d2`44b8fb80 00007ff8`bcf3e8d7 lldb_dap!__scrt_common_main_seh+0x10c [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl @ 288]
11 000000d2`44b8fbc0 00007ff8`beefbf6c KERNEL32!BaseThreadInitThunk+0x17
12 000000d2`44b8fbf0 00000000`00000000 ntdll!RtlUserThreadStart+0x2c
```
This stack trace was captured from the lldb distributed in the Swift
toolchain. The issue is easy to reproduce by resuming from a breakpoint
twice in VS Code.
I've verified that clearing out the container here fixes the assertion
failure.
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(again) (#128156)
This reverts commit
https://github.com/llvm/llvm-project/commit/87b7f63a117c340a6d9ca47959335fd7ef6c7ad2,
reapplying
https://github.com/llvm/llvm-project/commit/7e66cf74fb4e6a103f923e34700a7b6f20ac2a9b
with a small (and probably temporary)
change to generate more debug info to help with diagnosing buildbot
issues.
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lldb today has two rules: When a thread stops at a BreakpointSite, we
set the thread's StopReason to be "breakpoint hit" (regardless if we've
actually hit the breakpoint, or if we've merely stopped *at* the
breakpoint instruction/point and haven't tripped it yet). And second,
when resuming a process, any thread sitting at a BreakpointSite is
silently stepped over the BreakpointSite -- because we've already
flagged the breakpoint hit when we stopped there originally.
In this patch, I change lldb to only set a thread's stop reason to
breakpoint-hit when we've actually executed the instruction/triggered
the breakpoint. When we resume, we only silently step past a
BreakpointSite that we've registered as hit. We preserve this state
across inferior function calls that the user may do while stopped, etc.
Also, when a user adds a new breakpoint at $pc while stopped, or changes
$pc to be the address of a BreakpointSite, we will silently step past
that breakpoint when the process resumes. This is purely a UX call, I
don't think there's any person who wants to set a breakpoint at $pc and
then hit it immediately on resuming.
One non-intuitive UX from this change, butt is necessary: If you're
stopped at a BreakpointSite that has not yet executed, you `stepi`, you
will hit the breakpoint and the pc will not yet advance. This thread has
not completed its stepi, and the ThreadPlanStepInstruction is still on
the stack. If you then `continue` the thread, lldb will now stop and
say, "instruction step completed", one instruction past the
BreakpointSite. You can continue a second time to resume execution.
The bugs driving this change are all from lldb dropping the real stop
reason for a thread and setting it to breakpoint-hit when that was not
the case. Jim hit one where we have an aarch64 watchpoint that triggers
one instruction before a BreakpointSite. On this arch we are notified of
the watchpoint hit after the instruction has been unrolled -- we disable
the watchpoint, instruction step, re-enable the watchpoint and collect
the new value. But now we're on a BreakpointSite so the watchpoint-hit
stop reason is lost.
Another was reported by ZequanWu in
https://discourse.llvm.org/t/lldb-unable-to-break-at-start/78282 we
attach to/launch a process with the pc at a BreakpointSite and
misbehave. Caroline Tice mentioned it is also a problem they've had with
putting a breakpoint on _dl_debug_state.
The change to each Process plugin that does execution control is that
1. If we've stopped at a BreakpointSite that has not been executed yet,
we will call Thread::SetThreadStoppedAtUnexecutedBP(pc) to record that.
When the thread resumes, if the pc is still at the same site, we will
continue, hit the breakpoint, and stop again.
2. When we've actually hit a breakpoint (enabled for this thread or
not), the Process plugin should call
Thread::SetThreadHitBreakpointSite(). When we go to resume the thread,
we will push a step-over-breakpoint ThreadPlan before resuming.
The biggest set of changes is to StopInfoMachException where we
translate a Mach Exception into a stop reason. The Mach exception codes
differ in a few places depending on the target (unambiguously), and I
didn't want to duplicate the new code for each target so I've tested
what mach exceptions we get for each action on each target, and
reorganized StopInfoMachException::CreateStopReasonWithMachException to
document these possible values, and handle them without specializing
based on the target arch.
I first landed this patch in July 2024 via
https://github.com/llvm/llvm-project/pull/96260
but the CI bots and wider testing found a number of test case failures
that needed to be updated, I reverted it. I've fixed all of those issues
in separate PRs and this change should run cleanly on all the CI bots
now.
rdar://123942164
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This patch fixes LLDB Windows build with MSVC compiler. MSVC deletes
the default constructor due to virtual inheritance rules. Explicitly
define the default constructor in NativeRegisterContextWindows to
ensure constructibility.
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This reverts commit 7e66cf74fb4e6a103f923e34700a7b6f20ac2a9b.
Breaking green dragon:
https://green.lab.llvm.org/job/llvm.org/view/LLDB/job/as-lldb-cmake/19569/testReport/junit/lldb-api/functionalities_reverse-execution/TestReverseContinueWatchpoints_py/
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This reverts commit a774de807e56c1147d4630bfec3110c11d41776e.
This is the same changes as last time, plus:
* We load the binary into the target object so that on Windows, we can
resolve the locations of the functions.
* We now assert that each required breakpoint has at least 1 location,
to prevent an issue like that in the future.
* We are less strict about the unsupported error message, because it
prints "error: windows" on Windows instead of "error: gdb-remote".
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This PR adds support for hardware watchpoints in LLDB for AArch64
Windows targets.
Windows does not provide an API to query the number of available
hardware watchpoints supported by underlying hardware platform.
Therefore, current implementation supports only a single hardware
watchpoint, which has been verified on Windows 11 using Microsoft
SQ2 and Snapdragon Elite X hardware.
LLDB test suite ninja check-lldb still fails watchpoint-related tests.
However, tests that do not require more than a single watchpoint
pass successfully when run individually.
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(#123906)"" (#125091)
Reverts llvm/llvm-project#123945
Has failed on the Windows on Arm buildbot:
https://lab.llvm.org/buildbot/#/builders/141/builds/5865
```
********************
Unresolved Tests (2):
lldb-api :: functionalities/reverse-execution/TestReverseContinueBreakpoints.py
lldb-api :: functionalities/reverse-execution/TestReverseContinueWatchpoints.py
********************
Failed Tests (1):
lldb-api :: functionalities/reverse-execution/TestReverseContinueNotSupported.py
```
Reverting while I reproduce locally.
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(#123945)
This reverts commit 22561cfb443267905d4190f0e2a738e6b412457f and fixes
b7b9ccf44988edf49886743ae5c3cf4184db211f (#112079).
The problem is that x86_64 and Arm 32-bit have memory regions above the
stack that are readable but not writeable. First Arm:
```
(lldb) memory region --all
<...>
[0x00000000fffcf000-0x00000000ffff0000) rw- [stack]
[0x00000000ffff0000-0x00000000ffff1000) r-x [vectors]
[0x00000000ffff1000-0xffffffffffffffff) ---
```
Then x86_64:
```
$ cat /proc/self/maps
<...>
7ffdcd148000-7ffdcd16a000 rw-p 00000000 00:00 0 [stack]
7ffdcd193000-7ffdcd196000 r--p 00000000 00:00 0 [vvar]
7ffdcd196000-7ffdcd197000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0 [vsyscall]
```
Compare this to AArch64 where the test did pass:
```
$ cat /proc/self/maps
<...>
ffffb87dc000-ffffb87dd000 r--p 00000000 00:00 0 [vvar]
ffffb87dd000-ffffb87de000 r-xp 00000000 00:00 0 [vdso]
ffffb87de000-ffffb87e0000 r--p 0002a000 00:3c 76927217 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1
ffffb87e0000-ffffb87e2000 rw-p 0002c000 00:3c 76927217 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1
fffff4216000-fffff4237000 rw-p 00000000 00:00 0 [stack]
```
To solve this, look up the memory region of the stack pointer (using
https://lldb.llvm.org/resources/lldbgdbremote.html#qmemoryregioninfo-addr)
and constrain the read to within that region. Since we know the stack is
all readable and writeable.
I have also added skipIfRemote to the tests, since getting them working
in that context is too complex to be worth it.
Memory write failures now display the range they tried to write, and
register write errors will show the name of the register where possible.
The patch also includes a workaround for a an issue where the test code
could mistake an `x` response that happens to begin with an `O` for an
output packet (stdout). This workaround will not be necessary one we
start using the [new
implementation](https://discourse.llvm.org/t/rfc-fixing-incompatibilties-of-the-x-packet-w-r-t-gdb/84288)
of the `x` packet.
---------
Co-authored-by: Pavel Labath <pavel@labath.sk>
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Reverts llvm/llvm-project#112079 due to failures on the arm bot.
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This commit adds support for a
`SBProcess::ContinueInDirection()` API. A user-accessible command for
this will follow in a later commit.
This feature depends on a gdbserver implementation (e.g. `rr`) providing
support for the `bc` and `bs` packets. `lldb-server` does not support
those packets, and there is no plan to change that. For testing
purposes, this commit adds a Python implementation of *very limited*
record-and-reverse-execute functionality, implemented as a proxy between
lldb and lldb-server in `lldbreverse.py`. This should not (and in
practice cannot) be used for anything except testing.
The tests here are quite minimal but we test that simple breakpoints and
watchpoints work as expected during reverse execution, and that
conditional breakpoints and watchpoints work when the condition calls a
function that must be executed in the forward direction.
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(#115712)
Fixes #67825 Fixes #89077
Fixes
[RIDER-99436](https://youtrack.jetbrains.com/issue/RIDER-99436/Unity-Editor-will-be-crashed-when-detaching-LLDB-debugger-in-Rider),
which is upstream issue of #67825.
This PR changes the timing of calling `DebugActiveProcessStop` to after
calling `ContinueDebugEvent` for last debugger exception.
I confirmed the crashing behavior is because we call
`DebugActiveProcessStop` before `ContinueDebugEvent` for last debugger
exception with https://github.com/anatawa12/debug-api-test.
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(#116089)
Automatic formatting has removed the utility of these comments.
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Reverting this again; I added a commit which added @skipIfDarwin
markers to the TestReverseContinueBreakpoints.py and
TestReverseContinueNotSupported.py API tests, which use lldb-server
in gdbserver mode which does not work on Darwin. But the aarch64 ubuntu
bot reported a failure on TestReverseContinueBreakpoints.py,
https://lab.llvm.org/buildbot/#/builders/59/builds/6397
File "/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/reverse-execution/TestReverseContinueBreakpoints.py", line 63, in test_reverse_continue_skip_breakpoint
self.reverse_continue_skip_breakpoint_internal(async_mode=False)
File "/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/reverse-execution/TestReverseContinueBreakpoints.py", line 81, in reverse_continue_skip_breakpoint_internal
self.expect(
File "/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 2372, in expect
self.runCmd(
File "/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1002, in runCmd
self.assertTrue(self.res.Succeeded(), msg + output)
AssertionError: False is not true : Process should be stopped due to history boundary
Error output:
error: Process must be launched.
This reverts commit 4f297566b3150097de26c6a23a987d2bd5fc19c5.
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This commit only adds support for the
`SBProcess::ReverseContinue()` API. A user-accessible command for this
will follow in a later commit.
This feature depends on a gdbserver implementation (e.g. `rr`) providing
support for the `bc` and `bs` packets. `lldb-server` does not support
those packets, and there is no plan to change that. So, for testing
purposes, `lldbreverse.py` wraps `lldb-server` with a Python
implementation of *very limited* record-and-replay functionality for use
by *tests only*.
The majority of this PR is test infrastructure (about 700 of the 950
lines added).
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This reverts commit d5e1de6da96c1ab3b8cae68447e8ed3696a7006e.
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This commit only adds support for the
`SBProcess::ReverseContinue()` API. A user-accessible command for this
will follow in a later commit.
This feature depends on a gdbserver implementation (e.g. `rr`) providing
support for the `bc` and `bs` packets. `lldb-server` does not support
those packets, and there is no plan to change that. So, for testing
purposes, `lldbreverse.py` wraps `lldb-server` with a Python
implementation of *very limited* record-and-replay functionality for use
by *tests only*.
The majority of this PR is test infrastructure (about 700 of the 950
lines added).
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Don't call raw_string_ostream::flush(), which is essentially a no-op. As
specified in the docs, raw_string_ostream is always unbuffered. (
65b13610a5226b84889b923bae884ba395ad084d for further reference )
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As specified in the docs,
1) raw_string_ostream is always unbuffered and
2) the underlying buffer may be used directly
( 65b13610a5226b84889b923bae884ba395ad084d for further reference )
* Don't call raw_string_ostream::flush(), which is essentially a no-op.
* Avoid unneeded calls to raw_string_ostream::str(), to avoid excess
indirection.
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ReadProcessMemory will not perform the read if part of the memory is
unreadable (and even though the API has a `number_of_bytes_read`
argument). To make this work, I explicitly inspect the memory region
being read and only read the accessible part.
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This patch removes all of the Set.* methods from Status.
This cleanup is part of a series of patches that make it harder use the
anti-pattern of keeping a long-lives Status object around and updating
it while dropping any errors it contains on the floor.
This patch is largely NFC, the more interesting next steps this enables
is to:
1. remove Status.Clear()
2. assert that Status::operator=() never overwrites an error
3. remove Status::operator=()
Note that step (2) will bring 90% of the benefits for users, and step
(3) will dramatically clean up the error handling code in various
places. In the end my goal is to convert all APIs that are of the form
` ResultTy DoFoo(Status& error)
`
to
` llvm::Expected<ResultTy> DoFoo()
`
How to read this patch?
The interesting changes are in Status.h and Status.cpp, all other
changes are mostly
` perl -pi -e 's/\.SetErrorString/ = Status::FromErrorString/g' $(git
grep -l SetErrorString lldb/source)
`
plus the occasional manual cleanup.
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This fixes the following warning, when building with Clang ToT on
Windows:
```
[6668/7618] Building CXX object
tools\lldb\source\Plugins\Process\Windows\Common\CMakeFiles\lldbPluginProcessWindowsCommon.dir\TargetThreadWindows.cpp.obj
C:\src\git\llvm-project\lldb\source\Plugins\Process\Windows\Common\TargetThreadWindows.cpp(182,22):
warning: cast from 'FARPROC' (aka 'long long (*)()') to
'GetThreadDescriptionFunctionPtr' (aka 'long (*)(void *, wchar_t **)')
converts to incompatible function type [-Wcast-function-type-mismatch]
```
This is similar to: https://github.com/llvm/llvm-project/pull/97905
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This reverts commit 05f0e86cc895181b3d2210458c78938f83353002.
The debuginfo dexter tests are failing, probably because the way
stepping over breakpoints has changed with my patches. And there
are two API tests fails on the ubuntu-arm (32-bit) bot. I'll need
to investigate both of these, neither has an obvious failure reason.
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lldb today has two rules: When a thread stops at a BreakpointSite, we
set the thread's StopReason to be "breakpoint hit" (regardless if we've
actually hit the breakpoint, or if we've merely stopped *at* the
breakpoint instruction/point and haven't tripped it yet). And second,
when resuming a process, any thread sitting at a BreakpointSite is
silently stepped over the BreakpointSite -- because we've already
flagged the breakpoint hit when we stopped there originally.
In this patch, I change lldb to only set a thread's stop reason to
breakpoint-hit when we've actually executed the instruction/triggered
the breakpoint. When we resume, we only silently step past a
BreakpointSite that we've registered as hit. We preserve this state
across inferior function calls that the user may do while stopped, etc.
Also, when a user adds a new breakpoint at $pc while stopped, or changes
$pc to be the address of a BreakpointSite, we will silently step past
that breakpoint when the process resumes. This is purely a UX call, I
don't think there's any person who wants to set a breakpoint at $pc and
then hit it immediately on resuming.
One non-intuitive UX from this change, but I'm convinced it is
necessary: If you're stopped at a BreakpointSite that has not yet
executed, you `stepi`, you will hit the breakpoint and the pc will not
yet advance. This thread has not completed its stepi, and the thread
plan is still on the stack. If you then `continue` the thread, lldb will
now stop and say, "instruction step completed", one instruction past the
BreakpointSite. You can continue a second time to resume execution. I
discussed this with Jim, and trying to paper over this behavior will
lead to more complicated scenarios behaving non-intuitively. And mostly
it's the testsuite that was trying to instruction step past a breakpoint
and getting thrown off -- and I changed those tests to expect the new
behavior.
The bugs driving this change are all from lldb dropping the real stop
reason for a thread and setting it to breakpoint-hit when that was not
the case. Jim hit one where we have an aarch64 watchpoint that triggers
one instruction before a BreakpointSite. On this arch we are notified of
the watchpoint hit after the instruction has been unrolled -- we disable
the watchpoint, instruction step, re-enable the watchpoint and collect
the new value. But now we're on a BreakpointSite so the watchpoint-hit
stop reason is lost.
Another was reported by ZequanWu in
https://discourse.llvm.org/t/lldb-unable-to-break-at-start/78282 we
attach to/launch a process with the pc at a BreakpointSite and
misbehave. Caroline Tice mentioned it is also a problem they've had with
putting a breakpoint on _dl_debug_state.
The change to each Process plugin that does execution control is that
1. If we've stopped at a BreakpointSite that has not been executed yet,
we will call Thread::SetThreadStoppedAtUnexecutedBP(pc) to record
that. When the thread resumes, if the pc is still at the same site, we
will continue, hit the breakpoint, and stop again.
2. When we've actually hit a breakpoint (enabled for this thread or not),
the Process plugin should call Thread::SetThreadHitBreakpointSite().
When we go to resume the thread, we will push a step-over-breakpoint
ThreadPlan before resuming.
The biggest set of changes is to StopInfoMachException where we
translate a Mach Exception into a stop reason. The Mach exception codes
differ in a few places depending on the target (unambiguously), and I
didn't want to duplicate the new code for each target so I've tested
what mach exceptions we get for each action on each target, and
reorganized StopInfoMachException::CreateStopReasonWithMachException to
document these possible values, and handle them without specializing
based on the target arch.
rdar://123942164
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targetting Windows"
This reverts commit cf1ded3ac248ad4feeed7b4dd20c60b7e3c40339.
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Windows
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Hello!
Currently, watchpoints don't work on Windows (this can be reproduced
with the existing tests). This patch fixes the related issues so that
the tests and watchpoints start working.
Here is the list of tests that are fixed by this patch (on Windows,
checked in **release/18.x** branch):
- commands/watchpoints/hello_watchpoint/TestMyFirstWatchpoint.py
- commands/watchpoints/multiple_hits/TestMultipleHits.py
- commands/watchpoints/multiple_threads/TestWatchpointMultipleThreads.py
- commands/watchpoints/step_over_watchpoint/TestStepOverWatchpoint.py
- commands/watchpoints/unaligned-watchpoint/TestUnalignedWatchpoint.py
- commands/watchpoints/watchpoint_commands/TestWatchpointCommands.py
-
commands/watchpoints/watchpoint_commands/command/TestWatchpointCommandLLDB.py
-
commands/watchpoints/watchpoint_commands/command/TestWatchpointCommandPython.py
-
commands/watchpoints/watchpoint_commands/condition/TestWatchpointConditionCmd.py
- commands/watchpoints/watchpoint_count/TestWatchpointCount.py
- commands/watchpoints/watchpoint_disable/TestWatchpointDisable.py
- commands/watchpoints/watchpoint_size/TestWatchpointSizes.py
- python_api/watchpoint/TestSetWatchpoint.py
- python_api/watchpoint/TestWatchpointIgnoreCount.py
- python_api/watchpoint/TestWatchpointIter.py
- python_api/watchpoint/condition/TestWatchpointConditionAPI.py
- python_api/watchpoint/watchlocation/TestTargetWatchAddress.py
---------
Co-authored-by: Jason Molenda <jmolenda@apple.com>
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Fixes:
```
C:\git\llvm-project\lldb\source\Plugins\Process\Windows\Common\x64\RegisterContextWindows_x64.cpp(195,5): warning: missing field 'flags_type' initializer [-Wmissing-field-initializers]
```
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54981bb75d374 (#76255)
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This PR adds support for thread names in lldb on Windows.
```
(lldb) thr list
Process 2960 stopped
thread #53: tid = 0x03a0, 0x00007ff84582db34 ntdll.dll`NtWaitForMultipleObjects + 20
thread #29: tid = 0x04ec, 0x00007ff845830a14 ntdll.dll`NtWaitForAlertByThreadId + 20, name = 'SPUW.6'
thread #89: tid = 0x057c, 0x00007ff845830a14 ntdll.dll`NtWaitForAlertByThreadId + 20, name = 'PPU[0x1000019] physics[main]'
thread #3: tid = 0x0648, 0x00007ff843c2cafe combase.dll`InternalDoATClassCreate + 39518
thread #93: tid = 0x0688, 0x00007ff845830a14 ntdll.dll`NtWaitForAlertByThreadId + 20, name = 'PPU[0x100501d] uMovie::StreamingThread'
thread #1: tid = 0x087c, 0x00007ff842e7a104 win32u.dll`NtUserMsgWaitForMultipleObjectsEx + 20
thread #96: tid = 0x0890, 0x00007ff845830a14 ntdll.dll`NtWaitForAlertByThreadId + 20, name = 'PPU[0x1002020] HLE Video Decoder'
<...>
```
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This patch replaces uses of StringRef::{starts,ends}with with
StringRef::{starts,ends}_with for consistency with
std::{string,string_view}::{starts,ends}_with in C++20.
I'm planning to deprecate and eventually remove
StringRef::{starts,ends}with.
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This patch is rearranging code a bit to add WatchpointResources to
Process. A WatchpointResource is meant to represent a hardware
watchpoint register in the inferior process. It has an address, a size,
a type, and a list of Watchpoints that are using this
WatchpointResource.
This current patch doesn't add any of the features of
WatchpointResources that make them interesting -- a user asking to watch
a 24 byte object could watch this with three 8 byte WatchpointResources.
Or a Watchpoint on 1 byte at 0x1002 and a second watchpoint on 1 byte at
0x1003, these must both be served by a single WatchpointResource on that
doubleword at 0x1000 on a 64-bit target, if two hardware watchpoint
registers were used to track these separately, one of them may not be
hit. Or if you have one Watchpoint on a variable with a condition set,
and another Watchpoint on that same variable with a command defined or
different condition, or ignorecount, both of those Watchpoints need to
evaluate their criteria/commands when their WatchpointResource has been
hit.
There's a bit of code movement to rearrange things in the direction I'll
need for implementing this feature, so I want to start with reviewing &
landing this mostly NFC patch and we can focus on the algorithmic
choices about how WatchpointResources are shared and handled as they're
triggeed, separately.
This patch also stops printing "Watchpoint <n> hit: old value: <x>, new
vlaue: <y>" for Read watchpoints. I could make an argument for print
"Watchpoint <n> hit: current value <x>" but the current output doesn't
make any sense, and the user can print the value if they are
particularly interested. Read watchpoints are used primarily to
understand what code is reading a variable.
This patch adds more fallbacks for how to print the objects being
watched if we have types, instead of assuming they are all integral
values, so a struct will print its elements. As large watchpoints are
added, we'll be doing a lot more of those.
To track the WatchpointSP in the WatchpointResources, I changed the
internal API which took a WatchpointSP and devolved it to a Watchpoint*,
which meant touching several different Process files. I removed the
watchpoint code in ProcessKDP which only reported that watchpoints
aren't supported, the base class does that already.
I haven't yet changed how we receive a watchpoint to identify the
WatchpointResource responsible for the trigger, and identify all
Watchpoints that are using this Resource to evaluate their conditions
etc. This is the same work that a BreakpointSite needs to do when it has
been tiggered, where multiple Breakpoints may be at the same address.
There is not yet any printing of the Resources that a Watchpoint is
implemented in terms of ("watchpoint list", or
SBWatchpoint::GetDescription).
"watchpoint set var" and "watchpoint set expression" take a size
argument which was previously 1, 2, 4, or 8 (an enum). I've changed this
to an unsigned int. Most hardware implementations can only watch 1, 2,
4, 8 byte ranges, but with Resources we'll allow a user to ask for
different sized watchpoints and set them in hardware-expressble terms
soon.
I've annotated areas where I know there is work still needed with
LWP_TODO that I'll be working on once this is landed.
I've tested this on aarch64 macOS, aarch64 Linux, and Intel macOS.
https://discourse.llvm.org/t/rfc-large-watchpoint-support-in-lldb/72116
(cherry picked from commit fc6b72523f3d73b921690a713e97a433c96066c6)
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