зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1624810 - Replace individual nsCycleCollectionParticipant flags with a bit field to make it easier pass multiple flags through derived class oonstructors r=mccr8
Currently classes derived from nsCycleCollectionParicipant have one flag to pass and adding more makes the class delcaration macros get messy really quickly. This patch replaces boolean flags with a bitfield which makes adding new flags easier. Differential Revision: https://phabricator.services.mozilla.com/D68194 --HG-- extra : moz-landing-system : lando
This commit is contained in:
Jon Coppeard
Родитель
d66d0bdca0
Коммит
ff40627b14
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@ -116,9 +116,15 @@ struct TraceCallbackFunc : public TraceCallbacks {
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*/
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class NS_NO_VTABLE nsCycleCollectionParticipant {
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public:
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constexpr explicit nsCycleCollectionParticipant(
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bool aMightSkip, bool aTraverseShouldTrace = false)
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: mMightSkip(aMightSkip), mTraverseShouldTrace(aTraverseShouldTrace) {}
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using Flags = uint8_t;
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static constexpr Flags FlagMightSkip = 1u << 0;
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static constexpr Flags FlagTraverseShouldTrace = 1u << 1;
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static constexpr Flags AllFlags = FlagMightSkip | FlagTraverseShouldTrace;
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constexpr explicit nsCycleCollectionParticipant(Flags aFlags)
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: mFlags(aFlags) {
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MOZ_ASSERT((aFlags & ~AllFlags) == 0);
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}
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NS_IMETHOD TraverseNative(void* aPtr,
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nsCycleCollectionTraversalCallback& aCb) = 0;
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@ -126,7 +132,7 @@ class NS_NO_VTABLE nsCycleCollectionParticipant {
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nsresult TraverseNativeAndJS(void* aPtr,
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nsCycleCollectionTraversalCallback& aCb) {
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nsresult rv = TraverseNative(aPtr, aCb);
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if (mTraverseShouldTrace) {
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if (TraverseShouldTrace()) {
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// Note, we always call Trace, even if Traverse returned
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// NS_SUCCESS_INTERRUPTED_TRAVERSE.
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TraceCallbackFunc noteJsChild(&nsCycleCollectionParticipant::NoteJSChild);
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@ -161,7 +167,7 @@ class NS_NO_VTABLE nsCycleCollectionParticipant {
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// outgoing edges at all in the cycle collection graph (because then they
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// can't be parts of a cycle) or they know for sure they're alive.
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bool CanSkip(void* aPtr, bool aRemovingAllowed) {
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return mMightSkip ? CanSkipReal(aPtr, aRemovingAllowed) : false;
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return MightSkip() ? CanSkipReal(aPtr, aRemovingAllowed) : false;
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}
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// CanSkipInCC is called during construction of the initial set of roots for
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@ -190,7 +196,7 @@ class NS_NO_VTABLE nsCycleCollectionParticipant {
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// a live thing, while C++ things are also considered alive when their
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// refcount exceeds the number of edges via which they are reachable.
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bool CanSkipInCC(void* aPtr) {
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return mMightSkip ? CanSkipInCCReal(aPtr) : false;
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return MightSkip() ? CanSkipInCCReal(aPtr) : false;
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}
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// CanSkipThis is called during construction of the cycle collector graph,
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@ -209,7 +215,7 @@ class NS_NO_VTABLE nsCycleCollectionParticipant {
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// graph during root set construction. An object should never have
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// CanSkipThis called on it if it has outgoing strong references to JS things.
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bool CanSkipThis(void* aPtr) {
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return mMightSkip ? CanSkipThisReal(aPtr) : false;
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return MightSkip() ? CanSkipThisReal(aPtr) : false;
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}
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NS_IMETHOD_(void) DeleteCycleCollectable(void* aPtr) = 0;
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@ -229,14 +235,16 @@ class NS_NO_VTABLE nsCycleCollectionParticipant {
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}
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private:
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const bool mMightSkip;
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const bool mTraverseShouldTrace;
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bool MightSkip() const { return mFlags & FlagMightSkip; }
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bool TraverseShouldTrace() const { return mFlags & FlagTraverseShouldTrace; }
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const Flags mFlags;
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};
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class NS_NO_VTABLE nsScriptObjectTracer : public nsCycleCollectionParticipant {
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public:
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constexpr explicit nsScriptObjectTracer(bool aMightSkip)
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: nsCycleCollectionParticipant(aMightSkip, true) {}
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constexpr explicit nsScriptObjectTracer(Flags aFlags)
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: nsCycleCollectionParticipant(aFlags | FlagTraverseShouldTrace) {}
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NS_IMETHOD_(void)
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Trace(void* aPtr, const TraceCallbacks& aCb, void* aClosure) override = 0;
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@ -245,8 +253,8 @@ class NS_NO_VTABLE nsScriptObjectTracer : public nsCycleCollectionParticipant {
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class NS_NO_VTABLE nsXPCOMCycleCollectionParticipant
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: public nsScriptObjectTracer {
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public:
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constexpr explicit nsXPCOMCycleCollectionParticipant(bool aMightSkip)
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: nsScriptObjectTracer(aMightSkip) {}
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constexpr explicit nsXPCOMCycleCollectionParticipant(Flags aFlags)
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: nsScriptObjectTracer(aFlags) {}
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_XPCOMCYCLECOLLECTIONPARTICIPANT_IID)
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@ -599,19 +607,19 @@ T* DowncastCCParticipant(void* aPtr) {
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# define NOT_INHERITED_CANT_OVERRIDE
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#endif
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#define NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(_class, _base) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public nsXPCOMCycleCollectionParticipant { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(bool aMightSkip = false) \
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: nsXPCOMCycleCollectionParticipant(aMightSkip) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; \
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#define NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(_class, _base) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public nsXPCOMCycleCollectionParticipant { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(Flags aFlags = 0) \
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: nsXPCOMCycleCollectionParticipant(aFlags) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; \
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NOT_INHERITED_CANT_OVERRIDE
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#define NS_DECL_CYCLE_COLLECTION_CLASS(_class) \
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@ -623,9 +631,8 @@ T* DowncastCCParticipant(void* aPtr) {
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: public nsXPCOMCycleCollectionParticipant { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS( \
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bool aMightSkip = \
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true) /* Ignore aMightSkip: we always want skippability. */ \
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: nsXPCOMCycleCollectionParticipant(true) {} \
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Flags aFlags = FlagMightSkip) /* We always want skippability. */ \
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: nsXPCOMCycleCollectionParticipant(aFlags | FlagMightSkip) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \
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@ -641,21 +648,21 @@ T* DowncastCCParticipant(void* aPtr) {
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#define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_CLASS(_class) \
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NS_DECL_CYCLE_COLLECTION_SKIPPABLE_CLASS_AMBIGUOUS(_class, _class)
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#define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(_class, _base) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public nsXPCOMCycleCollectionParticipant { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(bool aMightSkip = false) \
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: nsXPCOMCycleCollectionParticipant(aMightSkip) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \
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NS_IMETHOD_(void) \
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Trace(void* p, const TraceCallbacks& cb, void* closure) override; \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; \
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#define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(_class, _base) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public nsXPCOMCycleCollectionParticipant { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(Flags aFlags = 0) \
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: nsXPCOMCycleCollectionParticipant(aFlags) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \
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NS_IMETHOD_(void) \
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Trace(void* p, const TraceCallbacks& cb, void* closure) override; \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; \
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NOT_INHERITED_CANT_OVERRIDE
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#define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_AMBIGUOUS( \
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@ -664,9 +671,8 @@ T* DowncastCCParticipant(void* aPtr) {
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: public nsXPCOMCycleCollectionParticipant { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS( \
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bool aMightSkip = \
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true) /* Ignore aMightSkip: we always want skippability. */ \
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: nsXPCOMCycleCollectionParticipant(true) {} \
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Flags aFlags = FlagMightSkip) /* We always want skippability. */ \
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: nsXPCOMCycleCollectionParticipant(aFlags | FlagMightSkip) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \
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@ -685,26 +691,26 @@ T* DowncastCCParticipant(void* aPtr) {
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NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_AMBIGUOUS(_class, \
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_class)
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#define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_INHERITED( \
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_class, _base_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS( \
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bool aMightSkip = \
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true) /* Ignore aMightSkip: we always want skippability. */ \
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: NS_CYCLE_COLLECTION_CLASSNAME(_base_class)(true) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \
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NS_IMETHOD_(void) \
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Trace(void* p, const TraceCallbacks& cb, void* closure) override; \
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NS_IMETHOD_(bool) CanSkipReal(void* p, bool aRemovingAllowed) override; \
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NS_IMETHOD_(bool) CanSkipInCCReal(void* p) override; \
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NS_IMETHOD_(bool) CanSkipThisReal(void* p) override; \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL_INHERITED(_class) \
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#define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_INHERITED( \
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_class, _base_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS( \
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Flags aFlags = FlagMightSkip) /* We always want skippability. */ \
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: NS_CYCLE_COLLECTION_CLASSNAME(_base_class)(aFlags | FlagMightSkip) { \
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} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \
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NS_IMETHOD_(void) \
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Trace(void* p, const TraceCallbacks& cb, void* closure) override; \
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NS_IMETHOD_(bool) CanSkipReal(void* p, bool aRemovingAllowed) override; \
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NS_IMETHOD_(bool) CanSkipInCCReal(void* p) override; \
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NS_IMETHOD_(bool) CanSkipThisReal(void* p) override; \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL_INHERITED(_class) \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME;
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#define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(_class) \
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@ -725,51 +731,51 @@ T* DowncastCCParticipant(void* aPtr) {
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY_NO_UNLINK(_class, _base_class) \
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NS_IMETHOD_(void) Unlink(void* p) override;
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#define NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(_class, _base_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(bool aMightSkip = false) \
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: NS_CYCLE_COLLECTION_CLASSNAME(_base_class)(aMightSkip) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL_INHERITED(_class) \
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#define NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(_class, _base_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(Flags aFlags = 0) \
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: NS_CYCLE_COLLECTION_CLASSNAME(_base_class)(aFlags) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL_INHERITED(_class) \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME;
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#define NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_NO_UNLINK(_class, \
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_base_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(bool aMightSkip = false) \
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: NS_CYCLE_COLLECTION_CLASSNAME(_base_class)(aMightSkip) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY_NO_UNLINK(_class, \
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_base_class) \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL_INHERITED(_class) \
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#define NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_NO_UNLINK(_class, \
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_base_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(Flags aFlags = 0) \
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: NS_CYCLE_COLLECTION_CLASSNAME(_base_class)(aFlags) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY_NO_UNLINK(_class, \
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_base_class) \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL_INHERITED(_class) \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME;
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#define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(_class, \
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_base_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(bool aMightSkip = false) \
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: NS_CYCLE_COLLECTION_CLASSNAME(_base_class)(aMightSkip) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \
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NS_IMETHOD_(void) \
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Trace(void* p, const TraceCallbacks& cb, void* closure) override; \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL_INHERITED(_class) \
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#define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(_class, \
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_base_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(Flags aFlags = 0) \
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: NS_CYCLE_COLLECTION_CLASSNAME(_base_class)(aFlags) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \
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NS_IMETHOD_(void) \
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Trace(void* p, const TraceCallbacks& cb, void* closure) override; \
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NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL_INHERITED(_class) \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME;
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// Cycle collector participant declarations.
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@ -794,8 +800,8 @@ T* DowncastCCParticipant(void* aPtr) {
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void DeleteCycleCollectable(void) { delete this; } \
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class NS_CYCLE_COLLECTION_INNERCLASS : public nsCycleCollectionParticipant { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(bool aMightSkip = false) \
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: nsCycleCollectionParticipant(aMightSkip) {} \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(Flags aFlags = 0) \
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: nsCycleCollectionParticipant(aFlags) {} \
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\
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private: \
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NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS_BODY(_class) \
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|
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@ -810,9 +816,8 @@ T* DowncastCCParticipant(void* aPtr) {
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class NS_CYCLE_COLLECTION_INNERCLASS : public nsCycleCollectionParticipant { \
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public: \
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constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS( \
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bool aMightSkip = \
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true) /* Ignore aMightSkip: we always want skippability. */ \
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||||
: nsCycleCollectionParticipant(true) {} \
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Flags aFlags = FlagMightSkip) /* We always want skippability. */ \
|
||||
: nsCycleCollectionParticipant(aFlags | FlagMightSkip) {} \
|
||||
\
|
||||
private: \
|
||||
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS_BODY(_class) \
|
||||
|
|
@ -843,21 +848,21 @@ T* DowncastCCParticipant(void* aPtr) {
|
|||
}; \
|
||||
static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME;
|
||||
|
||||
#define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(_class) \
|
||||
void DeleteCycleCollectable(void) { delete this; } \
|
||||
class NS_CYCLE_COLLECTION_INNERCLASS : public nsScriptObjectTracer { \
|
||||
public: \
|
||||
constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(bool aMightSkip = false) \
|
||||
: nsScriptObjectTracer(aMightSkip) {} \
|
||||
\
|
||||
private: \
|
||||
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS_BODY(_class) \
|
||||
NS_IMETHOD_(void) \
|
||||
Trace(void* p, const TraceCallbacks& cb, void* closure) override; \
|
||||
static constexpr nsScriptObjectTracer* GetParticipant() { \
|
||||
return &_class::NS_CYCLE_COLLECTION_INNERNAME; \
|
||||
} \
|
||||
}; \
|
||||
#define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(_class) \
|
||||
void DeleteCycleCollectable(void) { delete this; } \
|
||||
class NS_CYCLE_COLLECTION_INNERCLASS : public nsScriptObjectTracer { \
|
||||
public: \
|
||||
constexpr explicit NS_CYCLE_COLLECTION_INNERCLASS(Flags aFlags = 0) \
|
||||
: nsScriptObjectTracer(aFlags) {} \
|
||||
\
|
||||
private: \
|
||||
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS_BODY(_class) \
|
||||
NS_IMETHOD_(void) \
|
||||
Trace(void* p, const TraceCallbacks& cb, void* closure) override; \
|
||||
static constexpr nsScriptObjectTracer* GetParticipant() { \
|
||||
return &_class::NS_CYCLE_COLLECTION_INNERNAME; \
|
||||
} \
|
||||
}; \
|
||||
static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME;
|
||||
|
||||
#define NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(_class, _root_function) \
|
||||
|
|
|
|||
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