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see fe8c976 for more info
Co-authored-by: Andrey Lihatskiy <alihatskiy@productengine.com>
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Allow `LLEventPump` listener access to its own `LLBoundListener`.
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Remove documented `LLEventPump` support for `LLEventTrackable`. That claimed
support was always a little bit magical/fragile. IF:
* a class included `LLEventTrackable` as a base class AND
* an instance of that class was managed by `boost::shared_ptr` AND
* you passed one of that class's methods and the `boost::shared_ptr`
specifically to `boost::bind()` AND
* the resulting `boost::bind()` object was passed into `LLEventPump::listen()`
THEN the promise was that on destruction of that object, that listener would
automatically be disconnected -- instead of leaving a dangling pointer bound
into the `LLEventPump`, causing a crash on the next `LLEventPump::post()` call.
The only existing code in the viewer code base that exercised `LLEventTrackable`
functionality was in test programs. When the viewer calls `LLEventPump::listen()`,
it typically stores the resulting connection object in an `LLTempBoundListener`
variable, which guarantees disconnection on destruction of that variable.
The fact that `LLEventTrackable` support is specific to `boost::bind()`, that it
silently fails to keep its promise with `std::bind()` or a lambda or any other
form of C++ callable, makes it untrustworthy for new code.
Note that the code base still uses `boost::signals2::trackable` for other
`boost::signals2::signal` instances not associated with `LLEventPump`. We are
not changing those at this time.
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`listen()` still takes `LLEventListener`, a `callable(const LLSD&)`, but now
also accepts `LLAwareListener`, a `callable(const LLBoundListener&, const LLSD&)`.
This uses `boost::signals2::signal::connect_extended()`, which, when the
signal is called, passes to a connected listener the `LLBoundListener` (aka
`boost::signals2::connection`) representing its own connection. This allows a
listener to disconnect itself when done.
Internally, `listen_impl()` now always uses `connect_extended()`. When passed
a classic `LLEventListener`, `listen()` wraps it in a lambda that ignores the
passed `LLBoundListener`.
`listen()` also now accepts `LLVoidListener`, and internally wraps it in a lambda
that returns `false` on its behalf.
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Show description and actual value of LLSD type setting
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Remove ability to reuse a `LuaState` between `LLLUAmanager` functions.
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We couldn't discard the "p.s." fiber.run() call from LuaState::expr() until we
could count on fiber.lua's LL.atexit(fiber.run) call being executed after each
Lua script or chunk, and we couldn't count on that until we made
LLLUAmanager::runScriptFile() instantiate and destroy its LuaState on the C++
Lua-specific coroutine. Now that we've done that, use LL.atexit(fiber.run)
instead of the whole special-case "p.s." in LuaState::expr().
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Remove LLLUAmanager::mumbleScriptLine() LuaState& parameters. Make
startScriptLine(), waitScriptLine() and runScriptLine() exactly parallel to
startScriptFile(), waitScriptFile() and runScriptFile(). That means that
runScriptLine()'s C++ coroutine instantiates and destroys its own LuaState,
which means that LL.atexit() functions will run on the Lua-specific C++
coroutine rather than (say) the viewer's main coroutine.
Introduce LLLUAmanager::script_result typedef for std::pair<int, LLSD> and use
in method returns.
Remove LuaState::initLuaState(); move its logic back into the constructor.
Remove initLuaState() calls in the expr() error cases: they're moot now that
we won't get subsequent expr() calls on the same LuaState instance.
Remove LLFloaterLUADebug "Use clean lua_State" checkbox and the cleanLuaState()
method. Remove mState member.
Remove explicit LuaState declarations from LLLUAmanager tests. Adapt one test
for implicit LuaState: it was directly calling LuaState::obtainListener() to
discover the LuaListener's reply-pump name. But since that test also captures
two leap.request() calls from the Lua script, it can just look at the "reply"
key in either of those requests.
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Lua api for Snapshot and demo script
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Break out common `LLAppearanceMgr::wearOutfit(LLInventoryCategory*)` method
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Use LLSDParam<uuid_vec_t> in LLAppearanceListener::wearItems() and
detachItems() to build the vector of LLUUIDs from the passed LLSD array.
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Lua appearance listener
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into new private wearOutfit(LLInventoryCategory*) method.
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Use llsd::toMap() to return LLSD maps from "LLAppearance" listener.
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These encapsulate looping over a C++ iterable (be it a sequence container or
an associative container) and returning an LLSD array or map, respectively,
derived from the C++ container. By default, each C++ container item is
directly converted to LLSD.
Also make LLSDParam<LLSD> slightly more efficient by using
std::vector::emplace_back() instead of push_back(), which supports
std::vector<std::unique_ptr>, so we need not use std::shared_ptr.
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Add LuaAutorunPath, LuaCommandPath and LuaRequirePath settings.
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Passing std::string::c_str() to a (const std::string&) function parameter is
worse than clutter, it's pointless overhead: it forces the compiler to
construct a new std::string instance, instead of passing a const reference to
the one you already have in hand.
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Remove LL_TEST special case from require() code (to search in the viewer's
source tree). Instead, make llluamanager_test.cpp append to LuaRequirePath to
get the same effect.
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Streamline and robustify lua_emplace<T>() object cleanup.
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outfit items
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Remove AutorunLuaScriptFile and the LLLUAmanager::runScriptOnLogin() method
that checked it.
Instead, iterate over LuaAutorunPath directories at viewer startup, iterate
over *.lua files in each and implicitly run those.
LuaCommandPath and LuaRequirePath are not yet implemented.
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This is redundant (but harmless) on a Posix system, but it fills a missing
puzzle piece on Windows. The point of fsyspath is to be able to interchange
freely between fsyspath and std::string. Existing fsyspath could be
constructed and assigned from std::string, and we could explicitly call its
string() method to get a std::string, but an implicit fsyspath-to-string
conversion that worked on Posix would trip us up on Windows. Fix that.
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This replaces type_tag<T>(), which searched and possibly extended the type_tags
unordered_map at runtime. If we called lua_emplace<T>() from different threads,
that would require locking type_tags.
In contrast, the compiler must instantiate a distinct TypeTag<T> for every
distinct T passed to lua_emplace<T>(), so each gets a distinct value at static
initialization time. No locking is required; no lookup; no allocations.
Add a test to llluamanager_test.cpp to verify that each distinct T passed to
lua_emplace<T>() gets its own TypeTag<T>::value, and that each gets its own
destructor -- but that different lua_emplace<T>() calls with the same T share
the same TypeTag<T>::value and the same destructor.
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It turns out that Luau does not honor PUC-Rio Lua's __gc metafunction, so
despite elaborate measures, the previous lua_emplace<T>() implementation would
not have destroyed the contained C++ T object when the resulting userdata
object was garbage-collected.
Moreover, using LL.atexit() as the mechanism to destroy lua_emplace<T>()
userdata objects (e.g. LuaListener) would have been slightly fragile because
we also want to use LL.atexit() to make the final fiber.run() call, when
appropriate. Introducing an order dependency between fiber.run() and the
LuaListener destructor would not be robust.
Both of those problems are addressed by leveraging one of Luau's extensions
over PUC-Rio Lua. A Luau userdata object can have an int tag; and a tag can
have an associated C++ destructor function. When any userdata object bearing
that tag is garbage-collected, Luau will call that destructor; and Luau's
lua_close() function destroys all userdata objects.
The resulting lua_emplace<T>() and lua_toclass<T>() code is far simpler.
It only remains to generate a distinct int tag value for each different C++
type passed to the lua_emplace<T>() template.
unordered_map<std::type_index, int> addresses that need.
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Setting LOGTEST=DEBUG, when many unit/integration tests must be rebuilt and
run, can result in lots of unnecessary output. When we only want DEBUG log
output from a specific test program, make test.cpp recognize an environment
variable LOGTEST_testname, where 'testname' might be the full basename of the
executable, or part of INTEGRATION_TEST_testname or PROJECT_foo_TEST_testname.
When test.cpp notices a non-empty variable by that name, it behaves as if
LOGTEST were set to that value.
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UI-related Lua API work
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