From d2c3c2f9fe197b1856e9a8ed37aeb56b77e2ff07 Mon Sep 17 00:00:00 2001 From: Nat Goodspeed Date: Thu, 15 Sep 2016 20:18:12 -0400 Subject: MAINT-5232: Normalize LLSingleton subclasses. A shocking number of LLSingleton subclasses had public constructors -- and in several instances, were being explicitly instantiated independently of the LLSingleton machinery. This breaks the new LLSingleton dependency-tracking machinery. It seems only fair that if you say you want an LLSingleton, there should only be ONE INSTANCE! Introduce LLSINGLETON() and LLSINGLETON_EMPTY_CTOR() macros. These handle the friend class LLSingleton; and explicitly declare a private nullary constructor. To try to enforce the LLSINGLETON() convention, introduce a new pure virtual LLSingleton method you_must_use_LLSINGLETON_macro() which is, as you might suspect, defined by the macro. If you declare an LLSingleton subclass without using LLSINGLETON() or LLSINGLETON_EMPTY_CTOR() in the class body, you can't instantiate the subclass for lack of a you_must_use_LLSINGLETON_macro() implementation -- which will hopefully remind the coder. Trawl through ALL LLSingleton subclass definitions, sprinkling in LLSINGLETON() or LLSINGLETON_EMPTY_CTOR() as appropriate. Remove all explicit constructor declarations, public or private, along with relevant 'friend class LLSingleton' declarations. Where destructors are declared, move them into private section as well. Where the constructor was inline but nontrivial, move out of class body. Fix several LLSingleton abuses revealed by making ctors/dtors private: LLGlobalEconomy was both an LLSingleton and the base class for LLRegionEconomy, a non-LLSingleton. (Therefore every LLRegionEconomy instance contained another instance of the LLGlobalEconomy "singleton.") Extract LLBaseEconomy; LLGlobalEconomy is now a trivial subclass of that. LLRegionEconomy, as you might suspect, now derives from LLBaseEconomy. LLToolGrab, an LLSingleton, was also explicitly instantiated by LLToolCompGun's constructor. Extract LLToolGrabBase, explicitly instantiated, with trivial subclass LLToolGrab, the LLSingleton instance. (WARNING: LLToolGrabBase methods have an unnerving tendency to go after LLToolGrab::getInstance(). I DO NOT KNOW what should be the relationship between the instance in LLToolCompGun and the LLToolGrab singleton instance.) LLGridManager declared a variant constructor accepting (const std::string&), with the comment: // initialize with an explicity grid file for testing. As there is no evidence of this being called from anywhere, delete it. LLChicletBar's constructor accepted an optional (const LLSD&). As the LLSD parameter wasn't used, and as there is no evidence of it being passed from anywhere, delete the parameter. LLViewerWindow::shutdownViews() was checking LLNavigationBar:: instanceExists(), then deleting its getInstance() pointer -- leaving a dangling LLSingleton instance pointer, a land mine if any subsequent code should attempt to reference it. Use deleteSingleton() instead. ~LLAppViewer() was calling LLViewerEventRecorder::instance() and then explicitly calling ~LLViewerEventRecorder() on that instance -- leaving the LLSingleton instance pointer pointing to an allocated-but-destroyed instance. Use deleteSingleton() instead. --- indra/llcommon/llsingleton.h | 68 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 67 insertions(+), 1 deletion(-) (limited to 'indra/llcommon/llsingleton.h') diff --git a/indra/llcommon/llsingleton.h b/indra/llcommon/llsingleton.h index 92fba4c1a8..1b915dfd6e 100644 --- a/indra/llcommon/llsingleton.h +++ b/indra/llcommon/llsingleton.h @@ -223,7 +223,13 @@ LLSingletonBase::LLSingletonBase(tag): * Derive your class from LLSingleton, passing your subclass name as * LLSingleton's template parameter, like so: * - * class Foo: public LLSingleton{}; + * class Foo: public LLSingleton + * { + * // use this macro at start of every LLSingleton subclass + * LLSINGLETON(Foo); + * public: + * // ... + * }; * * Foo& instance = Foo::instance(); * @@ -279,6 +285,16 @@ private: return new DERIVED_TYPE(); } + // We know of no way to instruct the compiler that every subclass + // constructor MUST be private. However, we can make the LLSINGLETON() + // macro both declare a private constructor and provide the required + // friend declaration. How can we ensure that every subclass uses + // LLSINGLETON()? By making that macro provide a definition for this pure + // virtual method. If you get "can't instantiate class due to missing pure + // virtual method" for this method, then add LLSINGLETON(yourclass) in the + // subclass body. + virtual void you_must_use_LLSINGLETON_macro() = 0; + // stores pointer to singleton instance struct SingletonLifetimeManager { @@ -450,4 +466,54 @@ private: template typename LLSingleton::SingletonData LLSingleton::sData; +/** + * Use LLSINGLETON(Foo); at the start of an LLSingleton subclass body + * when you want to declare an out-of-line constructor: + * + * @code + * class Foo: public LLSingleton + * { + * // use this macro at start of every LLSingleton subclass + * LLSINGLETON(Foo); + * public: + * // ... + * }; + * // ... + * [inline] + * Foo::Foo() { ... } + * @endcode + * + * Unfortunately, this mechanism does not permit you to define even a simple + * (but nontrivial) constructor within the class body. If it's literally + * trivial, use LLSINGLETON_EMPTY_CTOR(); if not, use LLSINGLETON() and define + * the constructor outside the class body. If you must define it in a header + * file, use 'inline' (unless it's a template class) to avoid duplicate-symbol + * errors at link time. + */ +#define LLSINGLETON(DERIVED_CLASS) \ +private: \ + /* implement LLSingleton pure virtual method whose sole purpose */ \ + /* is to remind people to use this macro */ \ + virtual void you_must_use_LLSINGLETON_macro() {} \ + friend class LLSingleton; \ + DERIVED_CLASS() + +/** + * Use LLSINGLETON_EMPTY_CTOR(Foo); at the start of an LLSingleton + * subclass body when the constructor is trivial: + * + * @code + * class Foo: public LLSingleton + * { + * // use this macro at start of every LLSingleton subclass + * LLSINGLETON_EMPTY_CTOR(Foo); + * public: + * // ... + * }; + * @endcode + */ +#define LLSINGLETON_EMPTY_CTOR(DERIVED_CLASS) \ + /* LLSINGLETON() is carefully implemented to permit exactly this */ \ + LLSINGLETON(DERIVED_CLASS) {} + #endif -- cgit v1.2.3