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0026551: Optimization of initialization of OCCT RTTI

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Global instances of type descriptors are eliminated as unnecessary
This commit is contained in:
abv 2015-12-12 19:07:35 +03:00 committed by bugmaster
parent a0218ba1c5
commit 795be040eb
2 changed files with 10 additions and 18 deletions
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7
src/Standard/Standard_Type.cxx
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@ -37,8 +37,10 @@ Standard_Type::Standard_Type (const char* theSystemName,
const char* theName,
Standard_Size theSize,
const Handle(Standard_Type)& theParent) :
mySystemName (copy_string (theSystemName)),
myName(theName), mySize(theSize), myParent(theParent)
mySystemName(copy_string (theSystemName)),
myName(copy_string (theName)),
mySize(theSize),
myParent(theParent)
{
}
@ -127,4 +129,5 @@ Standard_Type::~Standard_Type ()
// cout << "Unregistering " << mySystemName << ": " << aRegistry.Extent() << endl;
Standard::Free (mySystemName);
Standard::Free (myName);
}

21
src/Standard/Standard_Type.hxx
View File

@ -57,7 +57,7 @@ public: \
// forward declaration of type_instance class
namespace opencascade {
template <typename T>
class type_instance;
struct type_instance;
}
//! This class provides legacy interface (type descriptor) to run-time type
@ -156,22 +156,18 @@ namespace opencascade {
//! Template class providing instantiation of type descriptors as static
//! variables (one per binary module). Having type descriptors defined as
//! static variables is essential to ensure that everything gets initialized
//! during library loading and thus no concurrency occurs when type system
//! is accessed from multiple threads.
//! static variables is essential to ensure that descriptors are initialized
//! once and in correct order.
template <typename T>
class type_instance
struct type_instance
{
static Handle(Standard_Type) myInstance;
public:
static const Handle(Standard_Type)& get ();
};
//! Specialization of type descriptor instance for void; returns null handle
template <>
class type_instance<void>
struct type_instance<void>
{
public:
Standard_EXPORT static Handle(Standard_Type) get () { return 0; }
};
@ -180,8 +176,6 @@ namespace opencascade {
template <typename T>
const Handle(Standard_Type)& type_instance<T>::get ()
{
(void)myInstance; // ensure that myInstance is instantiated
// static variable inside function ensures that descriptors
// are initialized in correct sequence
static Handle(Standard_Type) anInstance =
@ -190,11 +184,6 @@ namespace opencascade {
return anInstance;
}
// Static class field is defined to ensure initialization of all type
// descriptors at load time of the library
template <typename T>
Handle(Standard_Type) type_instance<T>::myInstance (get());
}
//! Operator printing type descriptor to stream