diff options
| -rw-r--r-- | indra/llcommon/llsafehandle.h | 46 | ||||
| -rw-r--r-- | indra/newview/llappviewer.cpp | 5 |
2 files changed, 45 insertions, 6 deletions
diff --git a/indra/llcommon/llsafehandle.h b/indra/llcommon/llsafehandle.h index af1c26dd4f..9550e6253e 100644 --- a/indra/llcommon/llsafehandle.h +++ b/indra/llcommon/llsafehandle.h @@ -27,6 +27,30 @@ #define LLSAFEHANDLE_H #include "llerror.h" // *TODO: consider eliminating this +#include "llsingleton.h" + +/*==========================================================================*| + ____ ___ _ _ ___ _____ _ _ ____ _____ _ +| _ \ / _ \ | \ | |/ _ \_ _| | | | / ___|| ____| | +| | | | | | | | \| | | | || | | | | \___ \| _| | | +| |_| | |_| | | |\ | |_| || | | |_| |___) | |___|_| +|____/ \___/ |_| \_|\___/ |_| \___/|____/|_____(_) + +This handle class is deprecated. Unfortunately it is already in widespread use +to reference the LLObjectSelection and LLParcelSelection classes, but do not +apply LLSafeHandle to other classes, or declare new instances. + +Instead, use LLPointer or other smart pointer types with appropriate checks +for NULL. If you're certain the reference cannot (or must not) be NULL, +consider storing a C++ reference instead -- or use (e.g.) LLCheckedHandle. + +When an LLSafeHandle<T> containing NULL is dereferenced, it resolves to a +canonical "null" T instance. This raises issues about the lifespan of the +"null" instance. In addition to encouraging sloppy coding practices, it +potentially masks bugs when code that performs some mutating operation +inadvertently applies it to the "null" instance. That result might or might +not ever affect subsequent computations. +|*==========================================================================*/ // Expands LLPointer to return a pointer to a special instance of class Type instead of NULL. // This is useful in instances where operations on NULL pointers are semantically safe and/or @@ -146,15 +170,25 @@ protected: } } - static Type* nonNull(Type* ptr) + // Define an LLSingleton whose sole purpose is to hold a "null instance" + // of the subject Type: the canonical instance to dereference if this + // LLSafeHandle actually holds a null pointer. We use LLSingleton + // specifically so that the "null instance" can be cleaned up at a well- + // defined time, specifically LLSingletonBase::deleteAll(). + // Of course, as with any LLSingleton, the "null instance" is only + // instantiated on demand -- in this case, if you actually try to + // dereference an LLSafeHandle containing null. + class NullInstanceHolder: public LLSingleton<NullInstanceHolder> { - return ptr == NULL ? sNullFunc() : ptr; - } + LLSINGLETON_EMPTY_CTOR(NullInstanceHolder); + ~NullInstanceHolder() {} + public: + Type mNullInstance; + }; - static Type* sNullFunc() + static Type* nonNull(Type* ptr) { - static Type sInstance; - return &sInstance; + return ptr? ptr : &NullInstanceHolder::instance().mNullInstance; } protected: diff --git a/indra/newview/llappviewer.cpp b/indra/newview/llappviewer.cpp index d41f33700f..850f7b1c31 100644 --- a/indra/newview/llappviewer.cpp +++ b/indra/newview/llappviewer.cpp @@ -3111,7 +3111,12 @@ void LLAppViewer::initUpdater() mUpdater->setAppExitCallback(boost::bind(&LLAppViewer::forceQuit, this)); mUpdater->initialize(channel, version, +// DRTVWR-418 transitional: query using "win64" until VMP is in place +#if LL_WINDOWS && (ADDRESS_SIZE == 64) + "win64", +#else gPlatform, +#endif getOSInfo().getOSVersionString(), unique_id, willing_to_test |