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addMethod() was using dynamic_cast<target class*>(this) and testing for
nullptr to decide whether the class owning the passed method is, or is not, a
subclass of LLEventDispatcher. The trouble is that it doesn't work for the
deferred add() calls queued by LazyEventAPI: the dynamic_cast was always
returning nullptr. static_cast works better, but that leaves us with the
problem we were trying to solve with dynamic_cast: what if the target class
really isn't a subclass? Use std::is_base_of to pick which of two addMethod()
overloads to invoke, one of which calls addFail().
(cherry picked from commit a4d520aa5d023d80cfeec4f40c3464b54cbcfc5b)
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std::get<I>(const tuple) injects const into the type of each returned tuple
element. Need to get a non-const ref to the tuple param to get the true type.
(cherry picked from commit 6dda39065d3ee231998cb8a2896f94e8a45c9a82)
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(cherry picked from commit 3be250da90dd3d361df713056b881e017684e2b3)
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for exceptions other than those thrown by base-class LLEventDispatcher.
Explain in LLDispatchListener Doxygen comments that for a request lacking a
"reply" key, any exception is allowed to propagate because it's likely to
reach the post() call that triggered the exception in the first place.
For batch LLDispatchListener operations, catch not only LLEventDispatcher::
DispatchError exceptions but any std::exception, so we can collect them to
report to the invoker. "Gotta catch 'em all!"
Make LLLeap catch any std::exception thrown by processing a request from the
plugin child process, log it and send a reply to the plugin. No plugin should
be allowed to crash the viewer.
(cherry picked from commit 94e10fd039b79f71ed8d7e10807b6e4eebd1928c)
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Now an LLEventAPI subclass method can call callFail(...) to report an error,
and the error will be annotated with the leaf class name, the instance name
and the way the method was reached. The enriched error message will be logged
and either sent back to the invoker or propagated as an exception, depending
on the invocation tactic. In other words, a business method can use callFail()
to Do The Right Thing according to the LLEventDispatcher contract.
Introduce a nested SetState RAII class to set and clear transient state.
SetState's constructor accepts variadic stringize() arguments. The resulting
message is passed to LLEventDispatcher::setState(), which requires a SetState
reference because ONLY SetState should call setState(): state data really is
intended to be transient. SetState guarantees it will be cleared every time
it's set.
setState() respects previously-set transient state. If a call from an inner
function finds that transient state was already set by some ancestor, it
ignores the call and informs the caller by returning false. This lets a given
SetState instance recognize whether it is responsible for clearing the current
transient state.
operator<<(std::ostream&, const LLEventDispatcher&) now appends getState() to
the data reported by streaming *this. Non-static LLEventDispatcher::callFail()
already prepends *this to the reported error message.
Transient state is managed by a fiber_specific_ptr, since different threads
and even different fibers within a thread might be concurrently performing
different operations on the same LLEventDispatcher.
Introduce a back pointer to the parent LLEventDispatcher in DispatchEntry.
Populate it with a new constructor parameter, propagated through every
subclass constructor. Hoist ParamsDispatchEntry::callFail() up into its
DispatchEntry base class. Make it call non-static LLEventDispatcher::
callFail(), which prepends the reported error with instance and transient
state info. Use DispatchEntry::callFail() in LLSDDispatchEntry::call(),
instead of redundantly calling LLEventDispatcher::callFail().
Similarly, introduce an LLEventDispatcher back pointer into LLSDArgsMapper for
use by its own callFail() method.
The above should (!) eliminate the need to replicate LLEventDispatcher
instance info into every helper object's descriptive strings. In particular,
since the previous info was stored in each object by its constructor, it
couldn't report associated transient information about how the subject
callable was actually reached. Traversing a back pointer to the live
LLEventDispatcher instance gets us the most current state.
Make the internal three-argument LLEventDispatcher::try_call() method, which
implements each of the operator()() and public try_call() methods, use
SetState to append "[name]" (for explicit operator()(name, event) calls) or
"[key=name]" (for implicit operator()(event) calls) to streamed *this.
In the new LLDispatchListener request array and request map operations, use
SetState to indicate the current entry in the array or map, overriding the
lower-level state set by three-argument LLEventDispatcher::try_call().
(cherry picked from commit 2f8d7d20f43ab411ea0fe8b756cb696954acfb3e)
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Add LL::always_return<T>(), which takes a callable and variadic arguments. It
calls the callable with those arguments and, if the returned type is
convertible to T, converts it and returns it. Otherwise it returns T().
always_return() is generalized from, and supersedes,
LLEventDispatcher::ReturnLLSD.
Add LL::function_arity<CALLABLE>, which extends
boost::function_types::function_arity by reporting results for both
std::function<CALLABLE> and boost::function<CALLABLE>. Use for
LL::apply(function, LLSD array) as well as for LLEventDispatcher.
Make LLEventDispatcher::add() overloads uniformly distinguish between a
callable (whether non-static member function or otherwise) that accepts a
single LLSD parameter, versus any other signature. Accepting exactly one LLSD
parameter signals that the callable will accept the composite arguments LLSD
blob, instead of asking LLEventDispatcher to unpack the arguments blob into
individual arguments.
Support add(subclass method) overloads for arbitrary-parameters methods as
well as for (const LLSD&) methods. Update tests accordingly: we need no longer
pass the boilerplate lambda instance getter that binds and returns 'this'.
Extract to the two LLEventDispatcher::make_invoker() overloads the LL::apply()
logic formerly found in ReturnLLSD.
Change lleventdispatcher_test.cpp tests from boost::bind(), which accepts
variadic arguments (even though it only passes a fixed set to the target
callable), to fixed-signature lambdas. This is because the revamped add()
overloads care about signature.
Add a test for a non-static method that accepts (const LLSD&), in other words
the composite arguments LLSD blob, and likewise returns LLSD.
(cherry picked from commit 95b787f7d7226ee9de79dfc9816f33c8bf199aad)
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Specifically, add tests for:
- successful map batch
- map batch with some errors and a reply pump
- map batch with some errors and no reply
- successful array batch
- array batch with some errors and a reply pump
- array batch with some errors and no reply
(cherry picked from commit 078f0f5c9fb5075a8ad01cac417e1d7ee2b6a919)
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Fix lleventdispatcher_test.cpp's test class DispatchResult::strfunc(),
intfunc(), mapfunc() and arrayfunc() to return values derived from (not
identical to) their arguments, so we can reuse these functions for further
testing of passing arguments to a named callable. Adjust existing tests
accordingly.
(cherry picked from commit 07e09a8daea008d28b97399920db60a147cf75c0)
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Now the value of the incoming event's dispatch key may be an LLSD::String (as
before), a map or an array, as documented in the augmented Doxygen class
comments. LLDispatchListener will attempt multiple calls before sending a
reply.
(cherry picked from commit 7671b37285c6cdf1afcddb0019311a822c8a4dc5)
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This captures logic we intend to reuse for forthcoming LLDispatchListener
batched request support.
(cherry picked from commit 3cb6d374cb76e4b00dc121255e8f5aa4e777fa27)
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Refine the special case of calling a nullary target function from an (event)
method, notably via LLDispatchListener.
(cherry picked from commit edcc52a9f60b1ec9b8f53603d6e2676558d41294)
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Add a new LLEventDispatcher constructor accepting not only the map key to
extract a requested function name, but a second map key to extract the
arguments -- when required.
In Doxygen comments, clarify the difference between the two constructors.
Move interaction with the LLEventPump subsystem to LLDispatchListener.
LLEventDispatcher is intended to be directly called. On error, instead of
looking for a "reply" key in the invocation LLSD, throw DispatchError.
Publish DispatchError, formerly an implementation detail, and its new subclass
DispatchMissing.
Make both LLEventDispatcher::operator()() overloads return LLSD, leveraging
the new internal ReturnLLSD logic that returns a degenerate LLSD blob for a
void target callable and, for compatible types, converts the returned value to
LLSD. Notably, the public try_call() overloads still return bool; any value
returned by the target callable is discarded.
Clarify the operator() and try_call() argument requirements for target
callables registered to accept an LLSD array, in Doxygen comments and in code.
In particular, the 'event' passed to (event) overloads (vs. the (name, event)
overloads) must be an LLSD map, so it must contain an "args" key (or the new
arguments map key specified to the constructor) containing the LLSD args
array.
Since the use of the new args key depends on whether the target callable is
registered to accept an array or a map, pass it into DispatchEntry::call()
(and all subclass overrides), along with a bool to disambiguate whether we
reached that method from an LLEventDispatcher (event) invocation method or a
(name, event) invocation method.
Allow streaming an LLEventDispatcher instance to std::ostream, primarily to
facilitate construction of proper error messages.
Revert the 'name' argument of internal try_call(key, name, event) to
std::string. Ditch try_call_log(), try_call_one() and reply(). Fold
try_call_one() logic into three-argument try_call().
Refactor callFail() as a template method accepting both the exception to throw
and arbitrary stringize() arguments from which to construct the exception
message. Non-static callFail() implicitly prepends the instance and a colon to
the rest of the arguments, and calls static sCallFail(). The latter constructs
the exception message, logs it and throws the specified exception. This
obviates try_call_log().
Make implementation detail helper class LLSDArgsMapper a private member of
LLEventDispatcher so it can access sCallFail(): we now want all error handling
to go through that method. Add LLSDArgsMapper::callFail() resembling
LLSDEventDispatcher::callFail(), but without having to specify the exception:
only LLEventDispatcher will throw anything but generic DispatchError.
Give LLEventDispatcher::ParamsDispatchEntry and its subclasses
ArrayParamsDispatchEntry and MapParamsDispatchEntry a new 'name' argument to
identify error messages. Store it and use it implicitly in new callFail()
method, very like LLSDArgsMapper::callFail(). Make LLEventDispatcher::
addArrayParamsDispatchEntry() and addMapParamsDispatchEntry() pass a 'name'
that includes the LLEventDispatcher instance name as well as the name of the
specific registered callable. This way we need not intercept a low-level error
and annotate it with contextual data: we can just let the exception propagate.
Make ParamsDispatchEntry::call() override catch LL::apply_error thrown by an
invoker_function, and pass its message to callFail(), i.e. rethrow as
LLEventDispatcher::DispatchError.
Introduce ArrayParamsDispatchEntry::call() override for the special logic to
extract an arguments array from a passed LLSD map -- but only under the
circumstances described in the Doxygen comment.
Add similar logic to MapParamsDispatchEntry::call(), but with both argskey
itself and a value for argskey optional in the passed LLSD map.
Because LLEventDispatcher now has two constructor overloads, allow subclass
constructor LLDispatchListener() to accept zero or more trailing arguments.
This is different than giving LLDispatchListener's constructor a default final
argument, in that the subclass doesn't need to specify its default value:
that's up to the base-class constructor. But it does require that the subclass
constructor move to the header file.
Move private LLEventDispatcher::reply() method to LLDispatchListener. Extend
LLDispatchListener::process() to handle DispatchError by attempting to reply
with a map containing an "error" key, per convention. (In other words, move
that logic from LLEventDispatcher to LLDispatchListener.) Also, for a map LLSD
result, attempt to reply with that result; for other defined LLSD types,
attempt to reply with a map containing a "data" key. This is backwards
compatible with previous behavior because all previous LLDispatchListener
subclass methods returned void, which now produces an undefined LLSD blob,
which we don't bother trying to send in reply.
In lleventdispatcher_test.cpp, rework tut::lleventdispatcher_data::call_exc()
yet again to catch DispatchError instead of listening for an LLEventPump reply
event. Similarly, make call_logerr() catch DispatchError. Since the exception
should also be logged, we ignore it and focus on the log, as before.
Add tests <23> to <27>, exercising calls to new class DispatchResult methods
returning string, int, LLSD map, LLSD array and void.
(cherry picked from commit 2f9c915dd3d5137b5b2b1a57f0179e1f7a090f8c)
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(cherry picked from commit 374eb409b98795158b36e232f670d1302f31b9ff)
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(cherry picked from commit 2ffbadc7a1275f662eb97ff9ce163a18cdb62c7c)
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LLStoreListener<LLSD> didn't work because of an ambiguity problem. Resolve
that by introducing an internal storeTarget() method.
Introduce LLCaptureListener<T> that's both an LLStoreListener and the variable
into which to capture the expected result. Introduce LLVarHolder<T> to contain
the variable, so we can guarantee the actual data member will be fully
constructed by the time we want to pass it to the LLStoreListener base class.
(cherry picked from commit a894703188a7755bb9acb897d6c31ae1af6efce0)
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apply_n(function, LLSD array) has been useful, so for completeness, add the
corresponding function for std::vector.
Add a reference to apply_n() in comments for both apply() functions.
(cherry picked from commit dfb63a92e0e9a419931caf5112e1f590924e0867)
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While calling a C++ function with arguments taken from a runtime-variable data
structure necessarily involves a bit of hocus-pocus, the best you can say for
the boost::fusion based implementation is that it worked. Sadly, template
recursion limited its applicability to a handful of function arguments. Now
that we have LL::apply(), use that instead. This implementation is much more
straightforward.
In particular, the LLSDArgsSource class, whose job was to dole out elements of
an LLSD array one at a time for the template recursion, goes away entirely.
Make virtual LLEventDispatcher::DispatchEntry::call() return LLSD instead of
void. All LLEventDispatcher target functions so far have been void; any
function that wants to respond to its invoker must do so explicitly by calling
sendReply() or constructing an LLEventAPI::Response instance. Supporting non-
void functions permits LLEventDispatcher to respond implicitly with the
returned value. Of course this requires a wrapper for void target functions
that returns LLSD::isUndefined().
Break out LLEventDispatcher::reply() from callFail(), so we can reply with
success as well as failure.
Make LLEventDispatcher::try_call_log() prepend the actual leaf class name and
description to any error returned by three-arg try_call(). That try_call()
overload reported "LLEventDispatcher(desc): " for a couple specific errors,
but no others. Hoist to try_call_log() to apply uniformly.
Introduce new try_call_one() method to diagnose name-not-found errors and
catch internal DispatchError and LL::apply_error exceptions. try_call_one()
returns a std::pair, containing either an error message or an LLSD value.
Make try_call_log() and three-arg try_call() accept LLSD 'name' instead of
plain std::string, allowing for the possibility of an array or map. That lets
us extend three-arg try_call() to break out new cases for the function selector
LLSD: isUndefined(), isArray(), isMap() and (current case) scalar String.
If try_call_one() reports an error, log it and try to send reply, as now. If
it returns LLSD::isUndefined(), e.g. from a void target function wrapper, do
nothing. But if it returns an LLSD map, try to send that back to the invoker.
And if it returns an LLSD scalar or array, wrap it in a map with key "data" to
respond to the invoker. Allowing a target function to return its result rather
than explicitly sending it opens the possibility of batched requests
(aggregate 'name') returning batched responses.
Almost every place that constructs LLEventDispatcher's internal DispatchError
exception called stringize() to format the what() string. Simplify calls by
making DispatchError accept variadic arguments and forward to stringize().
Add LL::invoke() to apply.h. Like LL::apply(), this is a (limited) C++14
foreshadowing of std::invoke(), with preprocessor conditionals to switch to
std::invoke() when that's available. Introduce LL::invoke() to handle a
callable that's actually a pointer to method.
Now our C++14 apply() implementation can accept pointer to method, using
invoke() to generalize the actual function call.
Also anticipate std::bind_front() with LL::bind_front(). For apply(func,
std::array) and our extensions apply(func, std::vector) and apply(func, LLSD),
we can't pass a pointer to method as the func unless the second argument
happens to be an array or vector of pointers (or references) to instances of
exactly the right class -- and of course LLSD can't store such at all. It's
tempting to pass std::bind(std::mem_fn(ptr_to_method), instance), but that
won't work: std::bind() requires a value or placeholder for each argument to
pass to the bound function. The bind() expression above would only work for a
nullary method. std::bind_front() would work, but that doesn't arrive until
C++20. Again, once we get there we'll defer to the std:: implementation.
Instead of the generic __cplusplus, check the appropriate feature-test macro
for availability of each of std::invoke(), std::apply() and std::bind_front().
Change apply() error handling from assert() to new LL::apply_error exception.
LLEventDispatcher must be able to intercept apply() errors. Move validation
and synthesis of the relevant error message to new apply.cpp source file.
Add to llptrto.h new LL::get_ref() and LL::get_ptr() template functions to
unify the cases of a calling template accepting either a pointer or a
reference. Wrapping the parameter in either get_ref() or get_ptr() allows
dereferencing the parameter as desired.
Move LL::apply(function, LLSD) argument validation/manipulation to a non-
template function in llsdutil.cpp: no need to replicate that logic in the
template for every CALLABLE specialization.
The trouble with passing bind_front(std::mem_fn(ptr_to_method), instance) to
apply() is that since bind_front() accepts and forwards variadic additional
arguments, apply() can't infer the arity of the bound ptr_to_method. Address
that by introducing apply_n<arity>(function, LLSD), permitting a caller to
infer the arity of ptr_to_method and explicitly pass it to apply_n().
Polish up lleventdispatcher_test.cpp accordingly. Wrong LLSD type and wrong
number of arguments now produce different (somewhat more informative) error
messages. Moreover, passing too many entries in an LLSD array used to work:
the extra arguments used to be ignored. Now we require that the size of the
array match the arity of the target function. Change the too-many-arguments
tests from success testing to error testing.
Replace 'foreach' aka BOOST_FOREACH macro invocations with range 'for'.
Replace STRINGIZE(item0 << item1 << ...) with stringize(item0, item1, ...).
(cherry picked from commit 9c049563b5480bb7e8ed87d9313822595b479c3b)
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For LLEventDispatcher::add(), use simpler std::enable_if construct that avoids
the need to restate the whole conditional.
Derive LLDispatchListener from LLEventStream, instead of containing an
instance. This sets up for LazyEventAPI. Don't allow tweaking an
LLDispatchListener (or subclass LLEventAPI) name.
(cherry-picked from af4fbc1f8a9 on the lazy-eventpump branch)
(cherry picked from commit 419e7a4230ae662b035ae771af8e7d8bceb2c8b1)
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Instead of checking whether an add() parameter is exactly LLSD or LLSDMap,
check whether it's convertible to LLSD -- which handles those cases and more.
(cherry picked from commit fa168c11f64771dadc5df86d14ca2f07eba3b8ba)
(cherry picked from commit 6b5bfc1cf674fc568d86d7ed623fd7bb3ee2f646)
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Previously, LLEventAPI intentionally hid all but one of the many add()
overloads supported by its LLEventDispatcher base class. The reason was that
certain of the add() methods take an optional fourth parameter that's an
LLSD::Map describing the expected parameter structure, while others take a
fourth templated parameter that's an instance getter callable. This led to
ambiguity, especially when passed an LLSDMap instance that's convertible to
LLSD but isn't literally LLSD. At the time, it was simpler to constrain the
add() methods inherited from LLEventDispatcher.
But by adding new std::enable_if constraints to certain LLEventDispatcher
add() methods, we've resolved the ambiguities, so LLEventAPI subclasses can
now use any add() overload (as claimed on the relevant Confluence page).
LLEventDispatcher comments have always loftily claimed that an instance getter
callable may return either a pointer or a reference, doesn't matter. But it
does when trying to pass the getter's result to boost::fusion::push_back(): a
reference must be wrapped with std::ref() while a pointer cannot be.
std::ref(pointer) produces errors. Introduce LLEventDispatcher::invoker::
bindable() overloads to Do The Right Thing whether passed a pointer or a
reference.
(cherry picked from commit 743f487c2e123171c9fc6d5b84d768f1d856d569)
(cherry picked from commit 8618e41b3489e321ecd70eb65ec4d9ca7e2f75c6)
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Originally the LLEventAPI mechanism was primarily used for VITA testing. In
that case it was okay for the viewer to crash with LL_ERRS if the test script
passed a bad request.
With puppetry, hopefully new LEAP scripts will be written to engage
LLEventAPIs in all sorts of interesting ways. Change error handling from
LL_ERRS to LL_WARNS. Furthermore, if the incoming request contains a "reply"
key, send back an error response to the requester.
Update lleventdispatcher_test.cpp accordingly.
(cherry picked from commit de0539fcbe815ceec2041ecc9981e3adf59f2806)
(cherry picked from commit 4b60941952e97691f11806062f4bc66dd5ac8dae)
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Instead of std::map<std::string, boost::shared_ptr>, use std::unique_ptr as
the mapped_type, using emplace() to store new entries. This more correctly
captures the desired semantics: we have no intention of passing around the
pointers in the map, we just want the map to delete them on destruction.
Use std::function instead of boost::function.
(cherry picked from commit 7ba53ef82db5683756e296225f0c8b838420a26e)
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(cherry picked from commit 7d33e00d925614911a7602da1bd79916cc849ad7)
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Add to apply_test.cpp a collect() function that incrementally accumulates an
arbitrary number of arguments into a std::vector<std::string>. Construct a
std::array<std::string> to pass it, using VAPPLY().
Clarify in header comments that LL::apply() can't call a variadic function
with arguments of dynamic size: std::vector or LLSD. The compiler can deduce
how many arguments to pass to a function with a fixed argument list; it can
deduce how many arguments to pass to a variadic function with a fixed number
of arguments. But it can't compile a call to a variadic function with an
arguments data structure whose size can vary at runtime.
(cherry picked from commit ceed33396266b123896f7cfb9b90abdf240e1eec)
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Make apply(function, std::array) and apply(function, std::vector) available
even when we borrow the C++17 implementation of apply(function, std::tuple).
Add apply(function, LLSD) with interpretations:
* isUndefined() is treated as an empty array, for calling a nullary function
* scalar LLSD is treated as a single-entry array, for calling a unary function
* isArray() converts function parameters using LLSDParam
* isMap() is an error.
Add unit tests for all flavors of LL::apply().
(cherry picked from commit 3006c24251c6259d00df9e0f4f66b8a617e6026d)
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Always search for python3[.exe] instead of plain 'python'. macOS Monterey no
longer bundles Python 2 at all.
Explicitly make PYTHON_EXECUTABLE a cached value so if the user edits it in
CMakeCache.txt, it won't be overwritten by indra/cmake/Python.cmake.
Do NOT set DYLD_LIBRARY_PATH for test executables! That has Bad Effects, as
discussed in https://stackoverflow.com/q/73418423/5533635. Instead, create
symlinks from build-mumble/sharedlibs/Resources -> Release/Resources and from
build-mumble/test/Resources -> ../sharedlibs/Release/Resources. For test
executables in sharedlibs/RelWithDebInfo and test/RelWithDebInfo, this
supports our dylibs' baked-in load path @executable_path/../Resources. That
load path assumes running in a standard app bundle (which the viewer in fact
does), but we've been avoiding creating an app bundle for every test program.
These symlinks allow us to continue doing that while avoiding
DYLD_LIBRARY_PATH.
Add indra/llcommon/apply.h. The LL::apply() function and its wrapper macro
VAPPLY were very useful in diagnosing the problem.
Tweak llleap_test.cpp. This source was modified extensively for diagnostic
purposes; these are the small improvements that remain.
(cherry picked from commit 15d37713b9113a6f70dde48c764df02c76e18cbc)
(cherry picked from commit a1adcf1905d1fbc5fe07ff5a627295ccfe461ac4)
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Bring over part of the LLEventDispatcher work inspired by DRTVWR-558.
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Observed on bugsplat, no repro. Something destroys LLConversationItem without cleaning list (some sessions reuse the item, but they aren't supposed to remove it). Either item should inform floater to be properly removed or should be stored as an LLPointer.
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following promotion of DRTVWR-577
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BUG-233797/233798 - fix blackout when u/w fog_density < 0
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Newer C++ compilers have different semantics around LLSDArray's special copy
constructor, which was essential to proper LLSD nesting. In short, we can no
longer trust LLSDArray to behave correctly. Now that we have variadic
functions, get rid of LLSDArray and replace every reference with llsd::array().
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It seems newer compilers have a different interpretation of exactly when to
engage LLSDArray's copy constructor. In particular, this assignment:
some_LLSD_map[key] = LLSDArray(...)(...)...;
used to convert the LLSDArray object directly to LLSD; now it first calls the
custom copy constructor, which embeds the intended array within an outer array
before assigning it into the containing map.
The newer llsd::array() function avoids that problem because what it returns
is already an LLSD object.
Taking inventory of LLSDArray assignments of that form turned up a number of
workarounds like LLSD(LLSDArray(...)). Replacing those with llsd::array() is
both simpler and more readable.
Tip of the hat to Chorazinallen for surfacing this issue!
(cherry picked from commit bb718155bddfbe7007029a0c9e69a4a98615f14d)
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following promotion of DRTVWR-539
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enabling AutoFPS
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