As suggested by Greg in https://github.com/llvm/llvm-project/pull/66534,
I'm adding a setting at the Target level that controls whether to show
leading zeroes in hex ValueObject values.
This has the benefit of reducing the amount of characters displayed in
certain interfaces, like VSCode.
The remaining use of ConstString in StructuredData is the Dictionary
class. Internally it's backed by a `std::map<ConstString, ObjectSP>`.
I propose that we replace it with a `llvm::StringMap<ObjectSP>`.
Many StructuredData::Dictionary objects are ephemeral and only exist for
a short amount of time. Many of these Dictionaries are only produced
once and are never used again. That leaves us with a lot of string data
in the ConstString StringPool that is sitting there never to be used
again. Even if the same string is used many times for keys of different
Dictionary objects, that is something we can measure and adjust for
instead of assuming that every key may be reused at some point in the
future.
Quick comparisons of key data is likely not a concern with Dictionary,
but the use of `llvm::StringMap` means that lookups should be fast with
its hashing strategy.
Switching to a llvm::StringMap meant that the iteration order may be
different. To account for this when serializing/dumping the dictionary,
I added some code to sort the output by key before emitting anything.
Differential Revision: https://reviews.llvm.org/D159313
The majority of UnixSignals strings are static in the sense that they do
not change. The overwhelming majority of these strings are string
literals. Using ConstString to manage their lifetime does not make
sense. The only exception to this is one of the subclasses of
UnixSignals, for which I have created a StringSet local to that file
which will guarantee the lifetimes of these StringRefs.
As for the other benefits of ConstString, string uniqueness is not a
concern (as many of them are already string literals) and comparing
signal names and aliases should not be a hot path.
Differential Revision: https://reviews.llvm.org/D159011
This patch simplifies the color handling logic in Editline and
IOHandlerEditline:
- Remove the m_color_prompts property from Editline and use the prompt
ANSI prefix and suffix as the single source of truth. This avoids
having to redraw the prompt unnecessarily, for example when colors
are enabled but the prompt prefix and suffix are empty.
- Rename m_color_prompts to just m_color in IOHandlerEditline and use
it to ensure consistency between colored prompts and colored
auto-suggestions. Some IOHandler explicitly turn off colors (such as
IOHandlerConfirm) and it doesn't really make sense to have one or the
other.
Users often want to change the look of their prompt and currently the
only way to do that is by using ANSI escape codes in the prompt itself.
This is not only tedious, it also results in extra whitespace because
our Editline wrapper, when computing the cursor column, doesn't ignore
the invisible escape codes.
We already have various *-ansi-{prefix,suffix} settings that allow the
users to customize the color of auto-suggestions and progress events,
using mnemonics like ${ansi.fg.yellow}. This patch brings the same
mechanism to the prompt.
rdar://115390406
Account for Unicode when computing the prompt column width. Previously,
the string length (i.e. number of bytes) rather than the width of the
Glyph was used to compute the cursor position. The result was that the
cursor would be offset to the right when using a prompt containing
Unicode.
Value::ResolveValue calls Value::GetValueAsData as part of its
implementation. The latter can receive an optional Module pointer, which
is always null when called from the former. Allow threading in the
Module in Value::ResolveValue.
rdar://115021869
Instead of creating a copy of the vector, we should just pass a
reference along. The only method that calls this Ctor also holds onto a
non-mutable reference to the vector of strings so a copy should be
unnecessary.
Add a new LC_NOTE for Mach-O corefiles, "proces metadata", which is a
JSON string. Currently there may be a `threads` key in the JSON,
and if `threads` is present, it is an array with the same number of
elements as there are LC_THREADs in the corefile. This patch adds
support for a `thread_id` key-value for each `thread` entry, to
supply a thread ID for that LC_THREAD.
Differential Revision: https://reviews.llvm.org/D158785
rdar://113037252
The default constructor for SBCommandInterpreter was (unintentionally)
made protected in 27b6a4e63a. The goal of the patch was to make the
constructor taking an lldb_private type protected, but due to the
presence of a default argument, this ctor also served as the default
constructor. The latter should remain public.
This commit reinstates the original behavior by removing the default
argument and having an explicit, public default constructor.
lldb already has a `ValueSP` type. This was confusing to me when reading
TypeCategoryMap, especially when `ValueSP` is not qualified. From first
glance it looks like it's referring to a
`std::shared_ptr<lldb_private::Value>` when it's really referring to a
`std::shared_ptr<lldb_private::TypeCategoryImpl>`.
This method was working as expected if LLDB_ENABLE_LIBEDIT is false, however, if it was true, then the variable m_current_lines_ptr was always pointing to an empty list, because Editline only updates its contents once the full input has been completed (see https://github.com/llvm/llvm-project/blob/main/lldb/source/Host/common/Editline.cpp#L1576).
A simple fix is to invoke Editline::GetInputAsStringList() from GetCurrentLines(), which is already used in many places as the common way to get the full input list.
Add support for syntax color highlighting disassembly in LLDB. This
patch relies on 77d1032516, which introduces support for syntax
highlighting in MC.
Currently only AArch64 and X86 have color support, but other interested
backends can adopt WithColor in their respective MCInstPrinter.
Differential revision: https://reviews.llvm.org/D159164
In Apple's downstream fork, there is support for understanding the swift
AST sections in various binaries. Even though the lldb on llvm.org does
not have support for debugging swift, I think it makes sense to move
support for recognizing swift ast sections upstream.
Differential Revision: https://reviews.llvm.org/D159142
ConstString can be implicitly converted into a llvm::StringRef. This is
very useful in many places, but it also hides places where we are
creating a ConstString only to use it as a StringRef for the entire
lifespan of the ConstString object.
I locally removed the implicit conversion and found some of the places we
were doing this.
Differential Revision: https://reviews.llvm.org/D159237
- Allow the definition of synthetic formatters in C++ even when LLDB is built without python scripting support.
- Fix linking problems with the CXXSyntheticChildren
Differential Revision: https://reviews.llvm.org/D158010
This is the next step in removing ConstString from StructuredData. There
are StringRef overloads already, let's use those where we can.
Differential Revision: https://reviews.llvm.org/D152870
59237bb52c changed the behavior of the `SetTimeout` and `GetTimeout` methods of `EvaluateExpressionOptions`, which broke the Mojo REPL and related services (https://docs.modular.com/mojo/) because it relies on having infinite timeouts. That's a necessity because developers often use the REPL for executing extremely long-running numeric jobs. Having said that, `EvaluateExpressionOptions` shouldn't be that opinionated on this matter anyway. Instead, it should be the responsibility of the evaluator to define which timeout to use for each specific case.
Differential Revision: https://reviews.llvm.org/D157764
There's no reason for GetSignalInfo to return the signal name. All users
of this method only use the return value to determine if the method
succeeded in filling in the output parameters, so let's explicitly make
it a bool instead of a pointer.
Differential Revision: https://reviews.llvm.org/D158457
Apple maintains a downstream fork of lldb in order to support swift
debugging. Much of that support is isolated to its own plugins, but some
of it is exposed in more generic code. I would like to take some of
the swift support we have downstream and move it upstream to llvm.org in
an effort to 1) reduce downstream maintenance burden, and 2) work
towards solidifying the process of adding new language support to lldb.
Differential Revision: https://reviews.llvm.org/D158470
59237bb52c changed the behavior of the `SetTimeout` and `GetTimeout` methods of `EvaluateExpressionOptions`, which broke the Mojo REPL and related services (https://docs.modular.com/mojo/) because it relies on having infinite timeouts. That's a necessity because developers often use the REPL for executing extremely long-running numeric jobs. Having said that, `EvaluateExpressionOptions` shouldn't be that opinionated on this matter anyway. Instead, it should be the responsibility of the evaluator to define which timeout to use for each specific case.
Differential Revision: https://reviews.llvm.org/D157764
Thread sanitizer reports a data race in Process.cpp in the usage of
m_process_input_reader. Fix this data race by introducing a mutex
guarding the access to this variable.
Differential Revision: https://reviews.llvm.org/D157648
ThreadSanitizer reports the following issue:
```
Write of size 8 at 0x00010a70abb0 by thread T3 (mutexes: write M0):
#0 lldb_private::ThreadList::Update(lldb_private::ThreadList&) ThreadList.cpp:741 (liblldb.18.0.0git.dylib:arm64+0x5dedf4) (BuildId: 9bced2aafa373580ae9d750d9cf79a8f32000000200000000100000000000e00)
#1 lldb_private::Process::UpdateThreadListIfNeeded() Process.cpp:1212 (liblldb.18.0.0git.dylib:arm64+0x53bbec) (BuildId: 9bced2aafa373580ae9d750d9cf79a8f32000000200000000100000000000e00)
Previous read of size 8 at 0x00010a70abb0 by main thread (mutexes: write M1):
#0 lldb_private::ThreadList::GetMutex() const ThreadList.cpp:785 (liblldb.18.0.0git.dylib:arm64+0x5df138) (BuildId: 9bced2aafa373580ae9d750d9cf79a8f32000000200000000100000000000e00)
#1 lldb_private::ThreadList::DidResume() ThreadList.cpp:656 (liblldb.18.0.0git.dylib:arm64+0x5de5c0) (BuildId: 9bced2aafa373580ae9d750d9cf79a8f32000000200000000100000000000e00)
#2 lldb_private::Process::PrivateResume() Process.cpp:3130 (liblldb.18.0.0git.dylib:arm64+0x53cd7c) (BuildId: 9bced2aafa373580ae9d750d9cf79a8f32000000200000000100000000000e00)
```
Fix this by only using the mutex in ThreadList and removing the one in
process entirely.
Differential Revision: https://reviews.llvm.org/D158034
ConstStrings are super cheap to copy around. It is often more expensive
to pass a pointer and potentially dereference it than just to always copy it.
Differential Revision: https://reviews.llvm.org/D158043
Add support for the `low_mem_addressing_bits` and
`high_mem_addressing_bits` keys in the stop reply packet,
in addition to the existing `addressing_bits`. Same
behavior as in the qHostInfo packet.
Clean up AddressableBits so we don't need to check if
any values have been set in the object before using it
to potentially update the Process address masks.
Differential Revision: https://reviews.llvm.org/D158041
Before the addition of the process "Shadow Listener" you could only have one
Listener observing the Process Broadcaster. That was necessary because fetching the
Process event is what switches the public process state, and for the execution
control logic to be manageable you needed to keep other listeners from causing
this to happen before the main process control engine was ready.
Ismail added the notion of a "ShadowListener" - which allowed you ONE
extra process listener. This patch inverts that setup by designating the
first listener as primary - and giving it priority in fetching events.
Differential Revision: https://reviews.llvm.org/D157556
On AArch64 systems, we may have different page table setups for
low memory and high memory, and therefore a different number of
bits used for addressing depending on which half of memory the
address is in.
This patch extends the qHostInfo and LC_NOTE "addrable bits" so
that it can specify the number of addressing bits in high memory
and in low memory separately. It builds on the patch I added in
https://reviews.llvm.org/D151292 where Process tracks the separate
address masks, and there is a user setting to set them manually.
Differential Revision: https://reviews.llvm.org/D157667
rdar://113225907
These functions have been NO-OPs since 2014 (44d937820b). Remove them
and deprecate the corresponding functions in SBDebugger.
Differential revision: https://reviews.llvm.org/D158000
My primary motivation here is actually to change something in
UnixSignals, but this change is a necesary precondition.
I've also updated the documentation and rewritten the log statements to
use `formatv` instead of `printf` (printf-style formatting and
llvm::StringRef don't mix well).
Differential Revision: https://reviews.llvm.org/D157662
Just about every file in the lldb project is built with C++ enabled.
Unless I've missed something, these macro guards don't really accomplish
very much.
Differential Revision: https://reviews.llvm.org/D157538
TSan reports the following data race:
Write of size 4 at 0x000109e0b160 by thread T2 (...):
#0 lldb_private::NativeFile::Close() File.cpp:329
#1 lldb_private::ConnectionFileDescriptor::Disconnect(...) ConnectionFileDescriptorPosix.cpp:232
#2 lldb_private::Communication::Disconnect(...) Communication.cpp:61
#3 lldb_private::process_gdb_remote::ProcessGDBRemote::DidExit() ProcessGDBRemote.cpp:1164
#4 lldb_private::Process::SetExitStatus(...) Process.cpp:1097
#5 lldb_private::process_gdb_remote::ProcessGDBRemote::MonitorDebugserverProcess(...) ProcessGDBRemote.cpp:3387
Previous read of size 4 at 0x000109e0b160 by main thread (...):
#0 lldb_private::NativeFile::IsValid() const File.h:393
#1 lldb_private::ConnectionFileDescriptor::IsConnected() const ConnectionFileDescriptorPosix.cpp:121
#2 lldb_private::Communication::IsConnected() const Communication.cpp:79
#3 lldb_private::process_gdb_remote::GDBRemoteCommunication::WaitForPacketNoLock(...) GDBRemoteCommunication.cpp:256
#4 lldb_private::process_gdb_remote::GDBRemoteCommunication::WaitForPacketNoLock(...) GDBRemoteCommunication.cpp:244
#5 lldb_private::process_gdb_remote::GDBRemoteClientBase::SendPacketAndWaitForResponseNoLock(...) GDBRemoteClientBase.cpp:246
I originally tried fixing the problem at the ConnectionFileDescriptor
level, but that operates on an IOObject which can have different thread
safety guarantees depending on its implementation.
For this particular issue, the problem is specific to NativeFile.
NativeFile can hold a file descriptor and/or a file stream. Throughout
its implementation, it checks if the descriptor or stream is valid and
do some operation on it if it is. While that works in a single threaded
environment, nothing prevents another thread from modifying the
descriptor or stream between the IsValid check and when it's actually
being used.
This patch prevents such issues by returning a ValueGuard RAII object.
As long as the object is in scope, the value is guaranteed by a lock.
Differential revision: https://reviews.llvm.org/D157347
StreamFile subclasses Stream (from lldbUtility) and is backed by a File
(from lldbHost). It does not depend on anything from lldbCore or any of its
sibling libraries, so I think it makes sense for this to live in
lldbHost instead.
Differential Revision: https://reviews.llvm.org/D157460
TSan reports the following race:
Write of size 8 at 0x000107707ee8 by main thread:
#0 lldb_private::ThreadedCommunication::StartReadThread(...) ThreadedCommunication.cpp:175
#1 lldb_private::Process::SetSTDIOFileDescriptor(...) Process.cpp:4533
#2 lldb_private::Platform::DebugProcess(...) Platform.cpp:1121
#3 lldb_private::PlatformDarwin::DebugProcess(...) PlatformDarwin.cpp:711
#4 lldb_private::Target::Launch(...) Target.cpp:3235
#5 CommandObjectProcessLaunch::DoExecute(...) CommandObjectProcess.cpp:256
#6 lldb_private::CommandObjectParsed::Execute(...) CommandObject.cpp:751
#7 lldb_private::CommandInterpreter::HandleCommand(...) CommandInterpreter.cpp:2054
Previous read of size 8 at 0x000107707ee8 by thread T5:
#0 lldb_private::HostThread::IsJoinable(...) const HostThread.cpp:30
#1 lldb_private::ThreadedCommunication::StopReadThread(...) ThreadedCommunication.cpp:192
#2 lldb_private::Process::ShouldBroadcastEvent(...) Process.cpp:3420
#3 lldb_private::Process::HandlePrivateEvent(...) Process.cpp:3728
#4 lldb_private::Process::RunPrivateStateThread(...) Process.cpp:3914
#5 std::__1::__function::__func<lldb_private::Process::StartPrivateStateThread(...) function.h:356
#6 lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(...) HostNativeThreadBase.cpp:62
#7 lldb_private::HostThreadMacOSX::ThreadCreateTrampoline(...) HostThreadMacOSX.mm:18
The problem is the lack of synchronization between starting and stopping
the read thread. This patch fixes that by protecting those operations
with a mutex.
Differential revision: https://reviews.llvm.org/D157361
