diff options
Diffstat (limited to 'indra/llcommon/llinstancetracker.h')
| -rw-r--r-- | indra/llcommon/llinstancetracker.h | 113 |
1 files changed, 68 insertions, 45 deletions
diff --git a/indra/llcommon/llinstancetracker.h b/indra/llcommon/llinstancetracker.h index afb714c71c..34d841a4e0 100644 --- a/indra/llcommon/llinstancetracker.h +++ b/indra/llcommon/llinstancetracker.h @@ -29,6 +29,7 @@ #define LL_LLINSTANCETRACKER_H #include <map> +#include <typeinfo> #include "string_table.h" #include <boost/utility.hpp> @@ -37,10 +38,40 @@ #include <boost/iterator/transform_iterator.hpp> #include <boost/iterator/indirect_iterator.hpp> +/** + * Base class manages "class-static" data that must actually have singleton + * semantics: one instance per process, rather than one instance per module as + * sometimes happens with data simply declared static. + */ class LL_COMMON_API LLInstanceTrackerBase : public boost::noncopyable { - protected: - static void * & getInstances(std::type_info const & info); +protected: + /// Get a process-unique void* pointer slot for the specified type_info + static void * & getInstances(std::type_info const & info); + + /// Find or create a STATICDATA instance for the specified TRACKED class. + /// STATICDATA must be default-constructible. + template<typename STATICDATA, class TRACKED> + static STATICDATA& getStatic() + { + void *& instances = getInstances(typeid(TRACKED)); + if (! instances) + { + instances = new STATICDATA; + } + return *static_cast<STATICDATA*>(instances); + } + + /// It's not essential to derive your STATICDATA (for use with + /// getStatic()) from StaticBase; it's just that both known + /// implementations do. + struct StaticBase + { + StaticBase(): + sIterationNestDepth(0) + {} + S32 sIterationNestDepth; + }; }; /// This mix-in class adds support for tracking all instances of the specified class parameter T @@ -50,8 +81,15 @@ class LL_COMMON_API LLInstanceTrackerBase : public boost::noncopyable template<typename T, typename KEY = T*> class LLInstanceTracker : public LLInstanceTrackerBase { - typedef typename std::map<KEY, T*> InstanceMap; typedef LLInstanceTracker<T, KEY> MyT; + typedef typename std::map<KEY, T*> InstanceMap; + struct StaticData: public StaticBase + { + InstanceMap sMap; + }; + static StaticData& getStatic() { return LLInstanceTrackerBase::getStatic<StaticData, MyT>(); } + static InstanceMap& getMap_() { return getStatic().sMap; } + public: class instance_iter : public boost::iterator_facade<instance_iter, T, boost::forward_traversal_tag> { @@ -61,12 +99,12 @@ public: instance_iter(const typename InstanceMap::iterator& it) : mIterator(it) { - ++sIterationNestDepth; + ++getStatic().sIterationNestDepth; } ~instance_iter() { - --sIterationNestDepth; + --getStatic().sIterationNestDepth; } @@ -95,18 +133,18 @@ public: key_iter(typename InstanceMap::iterator it) : mIterator(it) { - ++sIterationNestDepth; + ++getStatic().sIterationNestDepth; } key_iter(const key_iter& other) : mIterator(other.mIterator) { - ++sIterationNestDepth; + ++getStatic().sIterationNestDepth; } ~key_iter() { - --sIterationNestDepth; + --getStatic().sIterationNestDepth; } @@ -155,12 +193,17 @@ public: } protected: - LLInstanceTracker(KEY key) { add_(key); } + LLInstanceTracker(KEY key) + { + // make sure static data outlives all instances + getStatic(); + add_(key); + } virtual ~LLInstanceTracker() { // it's unsafe to delete instances of this type while all instances are being iterated over. - llassert(sIterationNestDepth == 0); - remove_(); + llassert_always(getStatic().sIterationNestDepth == 0); + remove_(); } virtual void setKey(KEY key) { remove_(); add_(key); } virtual const KEY& getKey() const { return mInstanceKey; } @@ -176,31 +219,24 @@ private: getMap_().erase(mInstanceKey); } - static InstanceMap& getMap_() - { - void * & instances = getInstances(typeid(MyT)); - if (! instances) - { - instances = new InstanceMap; - } - return * static_cast<InstanceMap*>(instances); - } - private: - KEY mInstanceKey; - static S32 sIterationNestDepth; }; -template <typename T, typename KEY> S32 LLInstanceTracker<T, KEY>::sIterationNestDepth = 0; - /// explicit specialization for default case where KEY is T* /// use a simple std::set<T*> template<typename T> class LLInstanceTracker<T, T*> : public LLInstanceTrackerBase { - typedef typename std::set<T*> InstanceSet; typedef LLInstanceTracker<T, T*> MyT; + typedef typename std::set<T*> InstanceSet; + struct StaticData: public StaticBase + { + InstanceSet sSet; + }; + static StaticData& getStatic() { return LLInstanceTrackerBase::getStatic<StaticData, MyT>(); } + static InstanceSet& getSet_() { return getStatic().sSet; } + public: /// for completeness of analogy with the generic implementation @@ -213,18 +249,18 @@ public: instance_iter(const typename InstanceSet::iterator& it) : mIterator(it) { - ++sIterationNestDepth; + ++getStatic().sIterationNestDepth; } instance_iter(const instance_iter& other) : mIterator(other.mIterator) { - ++sIterationNestDepth; + ++getStatic().sIterationNestDepth; } ~instance_iter() { - --sIterationNestDepth; + --getStatic().sIterationNestDepth; } private: @@ -250,13 +286,14 @@ public: protected: LLInstanceTracker() { - // it's safe but unpredictable to create instances of this type while all instances are being iterated over. I hate unpredictable. This assert will probably be turned on early in the next development cycle. + // make sure static data outlives all instances + getStatic(); getSet_().insert(static_cast<T*>(this)); } virtual ~LLInstanceTracker() { // it's unsafe to delete instances of this type while all instances are being iterated over. - llassert(sIterationNestDepth == 0); + llassert_always(getStatic().sIterationNestDepth == 0); getSet_().erase(static_cast<T*>(this)); } @@ -264,20 +301,6 @@ protected: { getSet_().insert(static_cast<T*>(this)); } - - static InstanceSet& getSet_() - { - void * & instances = getInstances(typeid(MyT)); - if (! instances) - { - instances = new InstanceSet; - } - return * static_cast<InstanceSet *>(instances); - } - - static S32 sIterationNestDepth; }; -template <typename T> S32 LLInstanceTracker<T, T*>::sIterationNestDepth = 0; - #endif |