378 lines
17 KiB
C++
378 lines
17 KiB
C++
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// The CScriptWeakRef class was originally implemented by vroad in March 2013
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#include "weakref.h"
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#include <new>
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#include <assert.h>
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#include <string.h> // strstr()
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BEGIN_AS_NAMESPACE
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static void ScriptWeakRefConstruct(asITypeInfo *type, void *mem)
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{
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new(mem) CScriptWeakRef(type);
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}
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static void ScriptWeakRefConstruct2(asITypeInfo *type, void *ref, void *mem)
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{
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new(mem) CScriptWeakRef(ref, type);
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// It's possible the constructor raised a script exception, in which case we
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// need to call the destructor in order to cleanup the memory before returning
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asIScriptContext *ctx = asGetActiveContext();
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if( ctx && ctx->GetState() == asEXECUTION_EXCEPTION )
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reinterpret_cast<CScriptWeakRef*>(mem)->~CScriptWeakRef();
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}
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static void ScriptWeakRefDestruct(CScriptWeakRef *obj)
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{
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obj->~CScriptWeakRef();
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}
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static bool ScriptWeakRefTemplateCallback(asITypeInfo *ti, bool &/*dontGarbageCollect*/)
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{
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asITypeInfo *subType = ti->GetSubType();
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// Weak references only work for reference types
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if( subType == 0 ) return false;
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if( !(subType->GetFlags() & asOBJ_REF) ) return false;
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// The subtype shouldn't be a handle
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if( ti->GetSubTypeId() & asTYPEID_OBJHANDLE )
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return false;
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// Make sure the type really supports weak references
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asUINT cnt = subType->GetBehaviourCount();
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for( asUINT n = 0; n < cnt; n++ )
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{
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asEBehaviours beh;
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subType->GetBehaviourByIndex(n, &beh);
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if( beh == asBEHAVE_GET_WEAKREF_FLAG )
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return true;
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}
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ti->GetEngine()->WriteMessage("weakref", 0, 0, asMSGTYPE_ERROR, "The subtype doesn't support weak references");
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return false;
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}
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CScriptWeakRef::CScriptWeakRef(asITypeInfo *type)
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{
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m_ref = 0;
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m_type = type;
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m_type->AddRef();
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m_weakRefFlag = 0;
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}
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CScriptWeakRef::CScriptWeakRef(const CScriptWeakRef &other)
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{
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m_ref = other.m_ref;
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m_type = other.m_type;
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m_type->AddRef();
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m_weakRefFlag = other.m_weakRefFlag;
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if( m_weakRefFlag )
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m_weakRefFlag->AddRef();
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}
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CScriptWeakRef::CScriptWeakRef(void *ref, asITypeInfo *type)
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{
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m_ref = ref;
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m_type = type;
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m_type->AddRef();
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// The given type should be the weakref template instance
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assert( strcmp(type->GetName(), "weakref") == 0 ||
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strcmp(type->GetName(), "const_weakref") == 0 );
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// Get the shared flag that will tell us when the object has been destroyed
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// This is threadsafe as we hold a strong reference to the object
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m_weakRefFlag = m_type->GetEngine()->GetWeakRefFlagOfScriptObject(m_ref, m_type->GetSubType());
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if( m_weakRefFlag )
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m_weakRefFlag->AddRef();
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}
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CScriptWeakRef::~CScriptWeakRef()
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{
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if( m_type )
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m_type->Release();
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if( m_weakRefFlag )
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m_weakRefFlag->Release();
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}
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CScriptWeakRef &CScriptWeakRef::operator =(const CScriptWeakRef &other)
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{
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// Don't do anything if it is the same reference
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// It is not enough to verify only the reference to the object, as the
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// address may be reused by another instance after the first has been freed.
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// By checking also the weakRefFlag we can be certain that it is the same
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// instance.
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if( m_ref == other.m_ref &&
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m_weakRefFlag == other.m_weakRefFlag )
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return *this;
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// Must not allow changing the type
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if( m_type != other.m_type )
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{
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// We can allow a weakref to be assigned to a const_weakref
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if( !(strcmp(m_type->GetName(), "const_weakref") == 0 &&
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strcmp(other.m_type->GetName(), "weakref") == 0 &&
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m_type->GetSubType() == other.m_type->GetSubType()) )
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{
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assert( false );
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return *this;
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}
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}
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m_ref = other.m_ref;
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if( m_weakRefFlag )
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m_weakRefFlag->Release();
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m_weakRefFlag = other.m_weakRefFlag;
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if( m_weakRefFlag )
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m_weakRefFlag->AddRef();
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return *this;
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}
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CScriptWeakRef &CScriptWeakRef::Set(void *newRef)
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{
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// Release the previous weak ref
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if( m_weakRefFlag )
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m_weakRefFlag->Release();
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// Retrieve the new weak ref
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m_ref = newRef;
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if( newRef )
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{
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m_weakRefFlag = m_type->GetEngine()->GetWeakRefFlagOfScriptObject(newRef, m_type->GetSubType());
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m_weakRefFlag->AddRef();
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}
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else
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m_weakRefFlag = 0;
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// Release the newRef since we're only supposed to hold a weakref
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m_type->GetEngine()->ReleaseScriptObject(newRef, m_type->GetSubType());
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return *this;
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}
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asITypeInfo *CScriptWeakRef::GetRefType() const
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{
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return m_type->GetSubType();
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}
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bool CScriptWeakRef::operator==(const CScriptWeakRef &o) const
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{
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// It is not enough to compare just the address of the object, as it may
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// be reused by another instance after the first has been freed. By verifying
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// also the weakRefFlag we can guarantee that it is indeed the same instance.
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if( m_ref == o.m_ref &&
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m_weakRefFlag == o.m_weakRefFlag &&
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m_type == o.m_type )
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return true;
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// TODO: If type is not the same, we should attempt to do a dynamic cast,
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// which may change the pointer for application registered classes
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return false;
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}
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bool CScriptWeakRef::operator!=(const CScriptWeakRef &o) const
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{
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return !(*this == o);
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}
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// AngelScript: used as '@obj = ref.get();'
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void *CScriptWeakRef::Get() const
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{
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// If we hold a null handle, then just return null
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if( m_ref == 0 || m_weakRefFlag == 0 )
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return 0;
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// Lock on the shared bool, so we can be certain it won't be changed to true
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// between the inspection of the flag and the increase of the ref count in the
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// owning object.
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m_weakRefFlag->Lock();
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if( !m_weakRefFlag->Get() )
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{
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m_type->GetEngine()->AddRefScriptObject(m_ref, m_type->GetSubType());
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m_weakRefFlag->Unlock();
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return m_ref;
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}
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m_weakRefFlag->Unlock();
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return 0;
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}
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bool CScriptWeakRef::Equals(void *ref) const
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{
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if( m_ref != ref )
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return false;
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// It is not enough to compare just the address, as another instance may
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// get the same address after the first instance has been freed. Verify the
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// weakref flag too to make sure it is the same instance
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asILockableSharedBool *flag = m_type->GetEngine()->GetWeakRefFlagOfScriptObject(ref, m_type->GetSubType());
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if (m_weakRefFlag != flag)
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return false;
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return true;
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}
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void RegisterScriptWeakRef_Native(asIScriptEngine *engine)
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{
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int r;
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// Register a type for non-const handles
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r = engine->RegisterObjectType("weakref<class T>", sizeof(CScriptWeakRef), asOBJ_VALUE | asOBJ_ASHANDLE | asOBJ_TEMPLATE | asOBJ_APP_CLASS_DAK); assert( r >= 0 );
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r = engine->RegisterObjectBehaviour("weakref<T>", asBEHAVE_CONSTRUCT, "void f(int&in)", asFUNCTION(ScriptWeakRefConstruct), asCALL_CDECL_OBJLAST); assert( r>= 0 );
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r = engine->RegisterObjectBehaviour("weakref<T>", asBEHAVE_CONSTRUCT, "void f(int&in, T@+)", asFUNCTION(ScriptWeakRefConstruct2), asCALL_CDECL_OBJLAST); assert( r>= 0 );
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r = engine->RegisterObjectBehaviour("weakref<T>", asBEHAVE_DESTRUCT, "void f()", asFUNCTION(ScriptWeakRefDestruct), asCALL_CDECL_OBJLAST); assert( r >= 0 );
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r = engine->RegisterObjectBehaviour("weakref<T>", asBEHAVE_TEMPLATE_CALLBACK, "bool f(int&in, bool&out)", asFUNCTION(ScriptWeakRefTemplateCallback), asCALL_CDECL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "T@ opImplCast()", asMETHOD(CScriptWeakRef, Get), asCALL_THISCALL); assert(r >= 0);
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r = engine->RegisterObjectMethod("weakref<T>", "T@ get() const", asMETHODPR(CScriptWeakRef, Get, () const, void*), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "weakref<T> &opHndlAssign(const weakref<T> &in)", asMETHOD(CScriptWeakRef, operator=), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "weakref<T> &opAssign(const weakref<T> &in)", asMETHOD(CScriptWeakRef, operator=), asCALL_THISCALL); assert(r >= 0);
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r = engine->RegisterObjectMethod("weakref<T>", "bool opEquals(const weakref<T> &in) const", asMETHODPR(CScriptWeakRef, operator==, (const CScriptWeakRef &) const, bool), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "weakref<T> &opHndlAssign(T@)", asMETHOD(CScriptWeakRef, Set), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "bool opEquals(const T@+) const", asMETHOD(CScriptWeakRef, Equals), asCALL_THISCALL); assert(r >= 0);
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// Register another type for const handles
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r = engine->RegisterObjectType("const_weakref<class T>", sizeof(CScriptWeakRef), asOBJ_VALUE | asOBJ_ASHANDLE | asOBJ_TEMPLATE | asOBJ_APP_CLASS_DAK); assert( r >= 0 );
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r = engine->RegisterObjectBehaviour("const_weakref<T>", asBEHAVE_CONSTRUCT, "void f(int&in)", asFUNCTION(ScriptWeakRefConstruct), asCALL_CDECL_OBJLAST); assert( r>= 0 );
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r = engine->RegisterObjectBehaviour("const_weakref<T>", asBEHAVE_CONSTRUCT, "void f(int&in, const T@+)", asFUNCTION(ScriptWeakRefConstruct2), asCALL_CDECL_OBJLAST); assert( r>= 0 );
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r = engine->RegisterObjectBehaviour("const_weakref<T>", asBEHAVE_DESTRUCT, "void f()", asFUNCTION(ScriptWeakRefDestruct), asCALL_CDECL_OBJLAST); assert( r >= 0 );
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r = engine->RegisterObjectBehaviour("const_weakref<T>", asBEHAVE_TEMPLATE_CALLBACK, "bool f(int&in, bool&out)", asFUNCTION(ScriptWeakRefTemplateCallback), asCALL_CDECL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "const T@ opImplCast() const", asMETHOD(CScriptWeakRef, Get), asCALL_THISCALL); assert(r >= 0);
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r = engine->RegisterObjectMethod("const_weakref<T>", "const T@ get() const", asMETHODPR(CScriptWeakRef, Get, () const, void*), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "const_weakref<T> &opHndlAssign(const const_weakref<T> &in)", asMETHOD(CScriptWeakRef, operator=), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "const_weakref<T> &opAssign(const const_weakref<T> &in)", asMETHOD(CScriptWeakRef, operator=), asCALL_THISCALL); assert(r >= 0);
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r = engine->RegisterObjectMethod("const_weakref<T>", "bool opEquals(const const_weakref<T> &in) const", asMETHODPR(CScriptWeakRef, operator==, (const CScriptWeakRef &) const, bool), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "const_weakref<T> &opHndlAssign(const T@)", asMETHOD(CScriptWeakRef, Set), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "bool opEquals(const T@+) const", asMETHOD(CScriptWeakRef, Equals), asCALL_THISCALL); assert(r >= 0);
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// Allow non-const weak references to be converted to const weak references
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r = engine->RegisterObjectMethod("const_weakref<T>", "const_weakref<T> &opHndlAssign(const weakref<T> &in)", asMETHOD(CScriptWeakRef, operator=), asCALL_THISCALL); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "bool opEquals(const weakref<T> &in) const", asMETHODPR(CScriptWeakRef, operator==, (const CScriptWeakRef &) const, bool), asCALL_THISCALL); assert( r >= 0 );
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}
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static void ScriptWeakRefConstruct_Generic(asIScriptGeneric *gen)
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{
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asITypeInfo *ti = *reinterpret_cast<asITypeInfo**>(gen->GetAddressOfArg(0));
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ScriptWeakRefConstruct(ti, gen->GetObject());
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}
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static void ScriptWeakRefConstruct2_Generic(asIScriptGeneric *gen)
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{
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asITypeInfo *ti = *reinterpret_cast<asITypeInfo**>(gen->GetAddressOfArg(0));
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void *ref = gen->GetArgAddress(1);
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ScriptWeakRefConstruct2(ti, ref, gen->GetObject());
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}
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static void ScriptWeakRefDestruct_Generic(asIScriptGeneric *gen)
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{
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CScriptWeakRef *self = reinterpret_cast<CScriptWeakRef*>(gen->GetObject());
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self->~CScriptWeakRef();
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}
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void CScriptWeakRef_Get_Generic(asIScriptGeneric *gen)
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{
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CScriptWeakRef *self = reinterpret_cast<CScriptWeakRef*>(gen->GetObject());
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gen->SetReturnAddress(self->Get());
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}
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void CScriptWeakRef_Assign_Generic(asIScriptGeneric *gen)
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{
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CScriptWeakRef *other = reinterpret_cast<CScriptWeakRef*>(gen->GetArgAddress(0));
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CScriptWeakRef *self = reinterpret_cast<CScriptWeakRef*>(gen->GetObject());
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*self = *other;
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gen->SetReturnAddress(self);
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}
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void CScriptWeakRef_Assign2_Generic(asIScriptGeneric *gen)
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{
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void *other = gen->GetArgAddress(0);
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CScriptWeakRef *self = reinterpret_cast<CScriptWeakRef*>(gen->GetObject());
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self->Set(other);
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gen->SetReturnAddress(self);
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}
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void CScriptWeakRef_Equals_Generic(asIScriptGeneric *gen)
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{
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CScriptWeakRef *other = reinterpret_cast<CScriptWeakRef*>(gen->GetArgAddress(0));
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CScriptWeakRef *self = reinterpret_cast<CScriptWeakRef*>(gen->GetObject());
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gen->SetReturnByte(*self == *other);
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}
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void CScriptWeakRef_Equals2_Generic(asIScriptGeneric *gen)
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{
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void *other = gen->GetArgAddress(0);
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CScriptWeakRef *self = reinterpret_cast<CScriptWeakRef*>(gen->GetObject());
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gen->SetReturnByte(self->Equals(other));
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}
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static void ScriptWeakRefTemplateCallback_Generic(asIScriptGeneric *gen)
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{
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asITypeInfo *ti = *reinterpret_cast<asITypeInfo**>(gen->GetAddressOfArg(0));
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bool *dontGarbageCollect = *reinterpret_cast<bool**>(gen->GetAddressOfArg(1));
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*reinterpret_cast<bool*>(gen->GetAddressOfReturnLocation()) = ScriptWeakRefTemplateCallback(ti, *dontGarbageCollect);
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}
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void RegisterScriptWeakRef_Generic(asIScriptEngine *engine)
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{
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int r;
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// Register a type for non-const handles
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r = engine->RegisterObjectType("weakref<class T>", sizeof(CScriptWeakRef), asOBJ_VALUE | asOBJ_ASHANDLE | asOBJ_TEMPLATE | asOBJ_APP_CLASS_DAK); assert( r >= 0 );
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r = engine->RegisterObjectBehaviour("weakref<T>", asBEHAVE_CONSTRUCT, "void f(int&in)", asFUNCTION(ScriptWeakRefConstruct_Generic), asCALL_GENERIC); assert( r>= 0 );
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r = engine->RegisterObjectBehaviour("weakref<T>", asBEHAVE_CONSTRUCT, "void f(int&in, T@+)", asFUNCTION(ScriptWeakRefConstruct2_Generic), asCALL_GENERIC); assert( r>= 0 );
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r = engine->RegisterObjectBehaviour("weakref<T>", asBEHAVE_TEMPLATE_CALLBACK, "bool f(int&in, bool&out)", asFUNCTION(ScriptWeakRefTemplateCallback_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectBehaviour("weakref<T>", asBEHAVE_DESTRUCT, "void f()", asFUNCTION(ScriptWeakRefDestruct_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "T@ opImplCast()", asFUNCTION(CScriptWeakRef_Get_Generic), asCALL_GENERIC); assert(r >= 0);
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r = engine->RegisterObjectMethod("weakref<T>", "T@ get() const", asFUNCTION(CScriptWeakRef_Get_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "weakref<T> &opHndlAssign(const weakref<T> &in)", asFUNCTION(CScriptWeakRef_Assign_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "weakref<T> &opAssign(const weakref<T> &in)", asFUNCTION(CScriptWeakRef_Assign_Generic), asCALL_GENERIC); assert(r >= 0);
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r = engine->RegisterObjectMethod("weakref<T>", "bool opEquals(const weakref<T> &in) const", asFUNCTION(CScriptWeakRef_Equals_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "weakref<T> &opHndlAssign(T@)", asFUNCTION(CScriptWeakRef_Assign2_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("weakref<T>", "bool opEquals(const T@+) const", asFUNCTION(CScriptWeakRef_Equals2_Generic), asCALL_GENERIC); assert(r >= 0);
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// Register another type for const handles
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r = engine->RegisterObjectType("const_weakref<class T>", sizeof(CScriptWeakRef), asOBJ_VALUE | asOBJ_ASHANDLE | asOBJ_TEMPLATE | asOBJ_APP_CLASS_DAK); assert( r >= 0 );
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r = engine->RegisterObjectBehaviour("const_weakref<T>", asBEHAVE_CONSTRUCT, "void f(int&in)", asFUNCTION(ScriptWeakRefConstruct_Generic), asCALL_GENERIC); assert( r>= 0 );
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r = engine->RegisterObjectBehaviour("const_weakref<T>", asBEHAVE_CONSTRUCT, "void f(int&in, const T@+)", asFUNCTION(ScriptWeakRefConstruct2_Generic), asCALL_GENERIC); assert( r>= 0 );
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r = engine->RegisterObjectBehaviour("const_weakref<T>", asBEHAVE_TEMPLATE_CALLBACK, "bool f(int&in, bool&out)", asFUNCTION(ScriptWeakRefTemplateCallback_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectBehaviour("const_weakref<T>", asBEHAVE_DESTRUCT, "void f()", asFUNCTION(ScriptWeakRefDestruct_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "const T@ opImplCast() const", asFUNCTION(CScriptWeakRef_Get_Generic), asCALL_GENERIC); assert(r >= 0);
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r = engine->RegisterObjectMethod("const_weakref<T>", "const T@ get() const", asFUNCTION(CScriptWeakRef_Get_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "const_weakref<T> &opHndlAssign(const const_weakref<T> &in)", asFUNCTION(CScriptWeakRef_Assign_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "const_weakref<T> &opAssign(const const_weakref<T> &in)", asFUNCTION(CScriptWeakRef_Assign_Generic), asCALL_GENERIC); assert(r >= 0);
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r = engine->RegisterObjectMethod("const_weakref<T>", "bool opEquals(const const_weakref<T> &in) const", asFUNCTION(CScriptWeakRef_Equals_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "const_weakref<T> &opHndlAssign(const T@)", asFUNCTION(CScriptWeakRef_Assign2_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "bool opEquals(const T@+) const", asFUNCTION(CScriptWeakRef_Equals2_Generic), asCALL_GENERIC); assert(r >= 0);
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// Allow non-const weak references to be converted to const weak references
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r = engine->RegisterObjectMethod("const_weakref<T>", "const_weakref<T> &opHndlAssign(const weakref<T> &in)", asFUNCTION(CScriptWeakRef_Assign_Generic), asCALL_GENERIC); assert( r >= 0 );
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r = engine->RegisterObjectMethod("const_weakref<T>", "bool opEquals(const weakref<T> &in) const", asFUNCTION(CScriptWeakRef_Equals_Generic), asCALL_GENERIC); assert( r >= 0 );
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}
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void RegisterScriptWeakRef(asIScriptEngine *engine)
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{
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if( strstr(asGetLibraryOptions(), "AS_MAX_PORTABILITY") )
|
|
RegisterScriptWeakRef_Generic(engine);
|
|
else
|
|
RegisterScriptWeakRef_Native(engine);
|
|
}
|
|
|
|
|
|
END_AS_NAMESPACE
|