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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// A Klass is the part of the klassOop that provides:
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// 1: language level class object (method dictionary etc.)
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// 2: provide vm dispatch behavior for the object
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// Both functions are combined into one C++ class. The toplevel class "Klass"
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// implements purpose 1 whereas all subclasses provide extra virtual functions
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// for purpose 2.
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// One reason for the oop/klass dichotomy in the implementation is
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// that we don't want a C++ vtbl pointer in every object. Thus,
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// normal oops don't have any virtual functions. Instead, they
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// forward all "virtual" functions to their klass, which does have
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// a vtbl and does the C++ dispatch depending on the object's
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// actual type. (See oop.inline.hpp for some of the forwarding code.)
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// ALL FUNCTIONS IMPLEMENTING THIS DISPATCH ARE PREFIXED WITH "oop_"!
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// Klass layout:
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// [header ] klassOop
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// [klass pointer ] klassOop
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// [C++ vtbl ptr ] (contained in Klass_vtbl)
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// [layout_helper ]
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// [super_check_offset ] for fast subtype checks
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// [secondary_super_cache] for fast subtype checks
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// [secondary_supers ] array of 2ndary supertypes
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// [primary_supers 0]
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// [primary_supers 1]
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// [primary_supers 2]
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// ...
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// [primary_supers 7]
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// [java_mirror ]
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// [super ]
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// [name ]
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// [first subklass]
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// [next_sibling ] link to chain additional subklasses
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// [modifier_flags]
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// [access_flags ]
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// [verify_count ] - not in product
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// [alloc_count ]
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// [last_biased_lock_bulk_revocation_time] (64 bits)
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// [prototype_header]
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// [biased_lock_revocation_count]
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// Forward declarations.
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class klassVtable;
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class KlassHandle;
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class OrderAccess;
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// Holder (or cage) for the C++ vtable of each kind of Klass.
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// We want to tightly constrain the location of the C++ vtable in the overall layout.
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class Klass_vtbl {
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protected:
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// The following virtual exists only to force creation of a C++ vtable,
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// so that this class truly is the location of the vtable of all Klasses.
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virtual void unused_initial_virtual() { }
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public:
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// The following virtual makes Klass_vtbl play a second role as a
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// factory protocol for subclasses of Klass ("sub-Klasses").
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// Here's how it works....
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//
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// This VM uses metaobjects as factories for their instances.
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//
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// In order to initialize the C++ vtable of a new instance, its
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// metaobject is forced to use the C++ placed new operator to
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// allocate the instance. In a typical C++-based system, each
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// sub-class would have its own factory routine which
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// directly uses the placed new operator on the desired class,
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// and then calls the appropriate chain of C++ constructors.
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//
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// However, this system uses shared code to performs the first
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// allocation and initialization steps for all sub-Klasses.
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// (See base_create_klass() and base_create_array_klass().)
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// This does not factor neatly into a hierarchy of C++ constructors.
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// Each caller of these shared "base_create" routines knows
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// exactly which sub-Klass it is creating, but the shared routine
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// does not, even though it must perform the actual allocation.
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//
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// Therefore, the caller of the shared "base_create" must wrap
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// the specific placed new call in a virtual function which
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// performs the actual allocation and vtable set-up. That
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// virtual function is here, Klass_vtbl::allocate_permanent.
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//
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// The arguments to Universe::allocate_permanent() are passed
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// straight through the placed new operator, which in turn
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// obtains them directly from this virtual call.
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//
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// This virtual is called on a temporary "example instance" of the
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// sub-Klass being instantiated, a C++ auto variable. The "real"
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// instance created by this virtual is on the VM heap, where it is
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// equipped with a klassOopDesc header.
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//
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// It is merely an accident of implementation that we use "example
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// instances", but that is why the virtual function which implements
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// each sub-Klass factory happens to be defined by the same sub-Klass
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// for which it creates instances.
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//
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// The vtbl_value() call (see below) is used to strip away the
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// accidental Klass-ness from an "example instance" and present it as
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// a factory. Think of each factory object as a mere container of the
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// C++ vtable for the desired sub-Klass. Since C++ does not allow
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// direct references to vtables, the factory must also be delegated
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// the task of allocating the instance, but the essential point is
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// that the factory knows how to initialize the C++ vtable with the
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// right pointer value. All other common initializations are handled
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// by the shared "base_create" subroutines.
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//
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virtual void* allocate_permanent(KlassHandle& klass, int size, TRAPS) const = 0;
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void post_new_init_klass(KlassHandle& klass, klassOop obj, int size) const;
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// Every subclass on which vtbl_value is called must include this macro.
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// Delay the installation of the klassKlass pointer until after the
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// the vtable for a new klass has been installed (after the call to new()).
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#define DEFINE_ALLOCATE_PERMANENT(thisKlass) \
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void* allocate_permanent(KlassHandle& klass_klass, int size, TRAPS) const { \
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void* result = new(klass_klass, size, THREAD) thisKlass(); \
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if (HAS_PENDING_EXCEPTION) return NULL; \
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klassOop new_klass = ((Klass*) result)->as_klassOop(); \
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OrderAccess::storestore(); \
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post_new_init_klass(klass_klass, new_klass, size); \
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return result; \
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}
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bool null_vtbl() { return *(intptr_t*)this == 0; }
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protected:
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void* operator new(size_t ignored, KlassHandle& klass, int size, TRAPS);
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};
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class Klass : public Klass_vtbl {
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friend class VMStructs;
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protected:
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// note: put frequently-used fields together at start of klass structure
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// for better cache behavior (may not make much of a difference but sure won't hurt)
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enum { _primary_super_limit = 8 };
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// The "layout helper" is a combined descriptor of object layout.
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// For klasses which are neither instance nor array, the value is zero.
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//
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// For instances, layout helper is a positive number, the instance size.
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// This size is already passed through align_object_size and scaled to bytes.
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// The low order bit is set if instances of this class cannot be
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// allocated using the fastpath.
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//
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// For arrays, layout helper is a negative number, containing four
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// distinct bytes, as follows:
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// MSB:[tag, hsz, ebt, log2(esz)]:LSB
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// where:
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// tag is 0x80 if the elements are oops, 0xC0 if non-oops
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// hsz is array header size in bytes (i.e., offset of first element)
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// ebt is the BasicType of the elements
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// esz is the element size in bytes
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// This packed word is arranged so as to be quickly unpacked by the
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// various fast paths that use the various subfields.
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//
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// The esz bits can be used directly by a SLL instruction, without masking.
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//
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// Note that the array-kind tag looks like 0x00 for instance klasses,
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// since their length in bytes is always less than 24Mb.
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//
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// Final note: This comes first, immediately after Klass_vtbl,
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// because it is frequently queried.
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jint _layout_helper;
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// The fields _super_check_offset, _secondary_super_cache, _secondary_supers
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// and _primary_supers all help make fast subtype checks. See big discussion
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// in doc/server_compiler/checktype.txt
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//
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// Where to look to observe a supertype (it is &_secondary_super_cache for
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// secondary supers, else is &_primary_supers[depth()].
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juint _super_check_offset;
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public:
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oop* oop_block_beg() const { return adr_secondary_super_cache(); }
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oop* oop_block_end() const { return adr_next_sibling() + 1; }
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protected:
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//
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// The oop block. All oop fields must be declared here and only oop fields
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// may be declared here. In addition, the first and last fields in this block
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// must remain first and last, unless oop_block_beg() and/or oop_block_end()
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// are updated. Grouping the oop fields in a single block simplifies oop
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// iteration.
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//
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// Cache of last observed secondary supertype
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klassOop _secondary_super_cache;
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// Array of all secondary supertypes
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objArrayOop _secondary_supers;
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// Ordered list of all primary supertypes
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klassOop _primary_supers[_primary_super_limit];
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// java/lang/Class instance mirroring this class
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oop _java_mirror;
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// Superclass
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klassOop _super;
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// Class name. Instance classes: java/lang/String, etc. Array classes: [I,
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// [Ljava/lang/String;, etc. Set to zero for all other kinds of classes.
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symbolOop _name;
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// First subclass (NULL if none); _subklass->next_sibling() is next one
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klassOop _subklass;
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// Sibling link (or NULL); links all subklasses of a klass
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klassOop _next_sibling;
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//
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// End of the oop block.
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//
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jint _modifier_flags; // Processed access flags, for use by Class.getModifiers.
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AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here.
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#ifndef PRODUCT
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int _verify_count; // to avoid redundant verifies
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#endif
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juint _alloc_count; // allocation profiling support - update klass_size_in_bytes() if moved/deleted
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// Biased locking implementation and statistics
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// (the 64-bit chunk goes first, to avoid some fragmentation)
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jlong _last_biased_lock_bulk_revocation_time;
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markOop _prototype_header; // Used when biased locking is both enabled and disabled for this type
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jint _biased_lock_revocation_count;
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public:
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// returns the enclosing klassOop
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klassOop as_klassOop() const {
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// see klassOop.hpp for layout.
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return (klassOop) (((char*) this) - sizeof(klassOopDesc));
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}
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public:
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// Allocation
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const Klass_vtbl& vtbl_value() const { return *this; } // used only on "example instances"
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static KlassHandle base_create_klass(KlassHandle& klass, int size, const Klass_vtbl& vtbl, TRAPS);
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static klassOop base_create_klass_oop(KlassHandle& klass, int size, const Klass_vtbl& vtbl, TRAPS);
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// super
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klassOop super() const { return _super; }
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void set_super(klassOop k) { oop_store_without_check((oop*) &_super, (oop) k); }
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// initializes _super link, _primary_supers & _secondary_supers arrays
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void initialize_supers(klassOop k, TRAPS);
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void initialize_supers_impl1(klassOop k);
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void initialize_supers_impl2(klassOop k);
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// klass-specific helper for initializing _secondary_supers
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virtual objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
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// java_super is the Java-level super type as specified by Class.getSuperClass.
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virtual klassOop java_super() const { return NULL; }
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juint super_check_offset() const { return _super_check_offset; }
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void set_super_check_offset(juint o) { _super_check_offset = o; }
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klassOop secondary_super_cache() const { return _secondary_super_cache; }
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void set_secondary_super_cache(klassOop k) { oop_store_without_check((oop*) &_secondary_super_cache, (oop) k); }
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objArrayOop secondary_supers() const { return _secondary_supers; }
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void set_secondary_supers(objArrayOop k) { oop_store_without_check((oop*) &_secondary_supers, (oop) k); }
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// Return the element of the _super chain of the given depth.
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// If there is no such element, return either NULL or this.
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klassOop primary_super_of_depth(juint i) const {
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assert(i < primary_super_limit(), "oob");
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klassOop super = _primary_supers[i];
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assert(super == NULL || super->klass_part()->super_depth() == i, "correct display");
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return super;
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}
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// Can this klass be a primary super? False for interfaces and arrays of
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// interfaces. False also for arrays or classes with long super chains.
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bool can_be_primary_super() const {
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const juint secondary_offset = secondary_super_cache_offset_in_bytes() + sizeof(oopDesc);
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return super_check_offset() != secondary_offset;
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}
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virtual bool can_be_primary_super_slow() const;
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// Returns number of primary supers; may be a number in the inclusive range [0, primary_super_limit].
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juint super_depth() const {
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if (!can_be_primary_super()) {
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return primary_super_limit();
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} else {
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juint d = (super_check_offset() - (primary_supers_offset_in_bytes() + sizeof(oopDesc))) / sizeof(klassOop);
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assert(d < primary_super_limit(), "oob");
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assert(_primary_supers[d] == as_klassOop(), "proper init");
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return d;
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}
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}
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// java mirror
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oop java_mirror() const { return _java_mirror; }
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void set_java_mirror(oop m) { oop_store((oop*) &_java_mirror, m); }
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// modifier flags
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jint modifier_flags() const { return _modifier_flags; }
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void set_modifier_flags(jint flags) { _modifier_flags = flags; }
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// size helper
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int layout_helper() const { return _layout_helper; }
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void set_layout_helper(int lh) { _layout_helper = lh; }
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// Note: for instances layout_helper() may include padding.
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// Use instanceKlass::contains_field_offset to classify field offsets.
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// sub/superklass links
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instanceKlass* superklass() const;
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Klass* subklass() const;
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Klass* next_sibling() const;
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void append_to_sibling_list(); // add newly created receiver to superklass' subklass list
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void remove_from_sibling_list(); // remove receiver from sibling list
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protected: // internal accessors
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klassOop subklass_oop() const { return _subklass; }
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klassOop next_sibling_oop() const { return _next_sibling; }
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void set_subklass(klassOop s);
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void set_next_sibling(klassOop s);
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oop* adr_super() const { return (oop*)&_super; }
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oop* adr_primary_supers() const { return (oop*)&_primary_supers[0]; }
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oop* adr_secondary_super_cache() const { return (oop*)&_secondary_super_cache; }
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oop* adr_secondary_supers()const { return (oop*)&_secondary_supers; }
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oop* adr_java_mirror() const { return (oop*)&_java_mirror; }
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oop* adr_name() const { return (oop*)&_name; }
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oop* adr_subklass() const { return (oop*)&_subklass; }
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oop* adr_next_sibling() const { return (oop*)&_next_sibling; }
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public:
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// Allocation profiling support
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juint alloc_count() const { return _alloc_count; }
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void set_alloc_count(juint n) { _alloc_count = n; }
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virtual juint alloc_size() const = 0;
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virtual void set_alloc_size(juint n) = 0;
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// Compiler support
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358 |
static int super_offset_in_bytes() { return offset_of(Klass, _super); }
|
|
359 |
static int super_check_offset_offset_in_bytes() { return offset_of(Klass, _super_check_offset); }
|
|
360 |
static int primary_supers_offset_in_bytes(){ return offset_of(Klass, _primary_supers); }
|
|
361 |
static int secondary_super_cache_offset_in_bytes() { return offset_of(Klass, _secondary_super_cache); }
|
|
362 |
static int secondary_supers_offset_in_bytes() { return offset_of(Klass, _secondary_supers); }
|
|
363 |
static int java_mirror_offset_in_bytes() { return offset_of(Klass, _java_mirror); }
|
|
364 |
static int modifier_flags_offset_in_bytes(){ return offset_of(Klass, _modifier_flags); }
|
|
365 |
static int layout_helper_offset_in_bytes() { return offset_of(Klass, _layout_helper); }
|
|
366 |
static int access_flags_offset_in_bytes() { return offset_of(Klass, _access_flags); }
|
|
367 |
|
|
368 |
// Unpacking layout_helper:
|
|
369 |
enum {
|
|
370 |
_lh_neutral_value = 0, // neutral non-array non-instance value
|
|
371 |
_lh_instance_slow_path_bit = 0x01,
|
|
372 |
_lh_log2_element_size_shift = BitsPerByte*0,
|
|
373 |
_lh_log2_element_size_mask = BitsPerLong-1,
|
|
374 |
_lh_element_type_shift = BitsPerByte*1,
|
|
375 |
_lh_element_type_mask = right_n_bits(BitsPerByte), // shifted mask
|
|
376 |
_lh_header_size_shift = BitsPerByte*2,
|
|
377 |
_lh_header_size_mask = right_n_bits(BitsPerByte), // shifted mask
|
|
378 |
_lh_array_tag_bits = 2,
|
|
379 |
_lh_array_tag_shift = BitsPerInt - _lh_array_tag_bits,
|
|
380 |
_lh_array_tag_type_value = ~0x00, // 0xC0000000 >> 30
|
|
381 |
_lh_array_tag_obj_value = ~0x01 // 0x80000000 >> 30
|
|
382 |
};
|
|
383 |
|
|
384 |
static int layout_helper_size_in_bytes(jint lh) {
|
|
385 |
assert(lh > (jint)_lh_neutral_value, "must be instance");
|
|
386 |
return (int) lh & ~_lh_instance_slow_path_bit;
|
|
387 |
}
|
|
388 |
static bool layout_helper_needs_slow_path(jint lh) {
|
|
389 |
assert(lh > (jint)_lh_neutral_value, "must be instance");
|
|
390 |
return (lh & _lh_instance_slow_path_bit) != 0;
|
|
391 |
}
|
|
392 |
static bool layout_helper_is_instance(jint lh) {
|
|
393 |
return (jint)lh > (jint)_lh_neutral_value;
|
|
394 |
}
|
|
395 |
static bool layout_helper_is_javaArray(jint lh) {
|
|
396 |
return (jint)lh < (jint)_lh_neutral_value;
|
|
397 |
}
|
|
398 |
static bool layout_helper_is_typeArray(jint lh) {
|
|
399 |
// _lh_array_tag_type_value == (lh >> _lh_array_tag_shift);
|
|
400 |
return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift);
|
|
401 |
}
|
|
402 |
static bool layout_helper_is_objArray(jint lh) {
|
|
403 |
// _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift);
|
|
404 |
return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift);
|
|
405 |
}
|
|
406 |
static int layout_helper_header_size(jint lh) {
|
|
407 |
assert(lh < (jint)_lh_neutral_value, "must be array");
|
|
408 |
int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask;
|
|
409 |
assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity");
|
|
410 |
return hsize;
|
|
411 |
}
|
|
412 |
static BasicType layout_helper_element_type(jint lh) {
|
|
413 |
assert(lh < (jint)_lh_neutral_value, "must be array");
|
|
414 |
int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask;
|
|
415 |
assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity");
|
|
416 |
return (BasicType) btvalue;
|
|
417 |
}
|
|
418 |
static int layout_helper_log2_element_size(jint lh) {
|
|
419 |
assert(lh < (jint)_lh_neutral_value, "must be array");
|
|
420 |
int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask;
|
|
421 |
assert(l2esz <= LogBitsPerLong, "sanity");
|
|
422 |
return l2esz;
|
|
423 |
}
|
|
424 |
static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) {
|
|
425 |
return (tag << _lh_array_tag_shift)
|
|
426 |
| (hsize << _lh_header_size_shift)
|
|
427 |
| ((int)etype << _lh_element_type_shift)
|
|
428 |
| (log2_esize << _lh_log2_element_size_shift);
|
|
429 |
}
|
|
430 |
static jint instance_layout_helper(jint size, bool slow_path_flag) {
|
|
431 |
return (size << LogHeapWordSize)
|
|
432 |
| (slow_path_flag ? _lh_instance_slow_path_bit : 0);
|
|
433 |
}
|
|
434 |
static int layout_helper_to_size_helper(jint lh) {
|
|
435 |
assert(lh > (jint)_lh_neutral_value, "must be instance");
|
|
436 |
// Note that the following expression discards _lh_instance_slow_path_bit.
|
|
437 |
return lh >> LogHeapWordSize;
|
|
438 |
}
|
|
439 |
// Out-of-line version computes everything based on the etype:
|
|
440 |
static jint array_layout_helper(BasicType etype);
|
|
441 |
|
|
442 |
// What is the maximum number of primary superclasses any klass can have?
|
|
443 |
#ifdef PRODUCT
|
|
444 |
static juint primary_super_limit() { return _primary_super_limit; }
|
|
445 |
#else
|
|
446 |
static juint primary_super_limit() {
|
|
447 |
assert(FastSuperclassLimit <= _primary_super_limit, "parameter oob");
|
|
448 |
return FastSuperclassLimit;
|
|
449 |
}
|
|
450 |
#endif
|
|
451 |
|
|
452 |
// vtables
|
|
453 |
virtual klassVtable* vtable() const { return NULL; }
|
|
454 |
|
|
455 |
static int klass_size_in_bytes() { return offset_of(Klass, _alloc_count) + sizeof(juint); } // all "visible" fields
|
|
456 |
|
|
457 |
// subclass check
|
|
458 |
bool is_subclass_of(klassOop k) const;
|
|
459 |
// subtype check: true if is_subclass_of, or if k is interface and receiver implements it
|
|
460 |
bool is_subtype_of(klassOop k) const {
|
|
461 |
juint off = k->klass_part()->super_check_offset();
|
|
462 |
klassOop sup = *(klassOop*)( (address)as_klassOop() + off );
|
|
463 |
const juint secondary_offset = secondary_super_cache_offset_in_bytes() + sizeof(oopDesc);
|
|
464 |
if (sup == k) {
|
|
465 |
return true;
|
|
466 |
} else if (off != secondary_offset) {
|
|
467 |
return false;
|
|
468 |
} else {
|
|
469 |
return search_secondary_supers(k);
|
|
470 |
}
|
|
471 |
}
|
|
472 |
bool search_secondary_supers(klassOop k) const;
|
|
473 |
|
|
474 |
// Find LCA in class heirarchy
|
|
475 |
Klass *LCA( Klass *k );
|
|
476 |
|
|
477 |
// Check whether reflection/jni/jvm code is allowed to instantiate this class;
|
|
478 |
// if not, throw either an Error or an Exception.
|
|
479 |
virtual void check_valid_for_instantiation(bool throwError, TRAPS);
|
|
480 |
|
|
481 |
// Casting
|
|
482 |
static Klass* cast(klassOop k) {
|
|
483 |
assert(k->is_klass(), "cast to Klass");
|
|
484 |
return k->klass_part();
|
|
485 |
}
|
|
486 |
|
|
487 |
// array copying
|
|
488 |
virtual void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
|
|
489 |
|
|
490 |
// tells if the class should be initialized
|
|
491 |
virtual bool should_be_initialized() const { return false; }
|
|
492 |
// initializes the klass
|
|
493 |
virtual void initialize(TRAPS);
|
|
494 |
// lookup operation for MethodLookupCache
|
|
495 |
friend class MethodLookupCache;
|
|
496 |
virtual methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
|
|
497 |
public:
|
|
498 |
methodOop lookup_method(symbolOop name, symbolOop signature) const {
|
|
499 |
return uncached_lookup_method(name, signature);
|
|
500 |
}
|
|
501 |
|
|
502 |
// array class with specific rank
|
|
503 |
klassOop array_klass(int rank, TRAPS) { return array_klass_impl(false, rank, THREAD); }
|
|
504 |
|
|
505 |
// array class with this klass as element type
|
|
506 |
klassOop array_klass(TRAPS) { return array_klass_impl(false, THREAD); }
|
|
507 |
|
|
508 |
// These will return NULL instead of allocating on the heap:
|
|
509 |
// NB: these can block for a mutex, like other functions with TRAPS arg.
|
|
510 |
klassOop array_klass_or_null(int rank);
|
|
511 |
klassOop array_klass_or_null();
|
|
512 |
|
|
513 |
virtual oop protection_domain() { return NULL; }
|
|
514 |
virtual oop class_loader() const { return NULL; }
|
|
515 |
|
|
516 |
protected:
|
|
517 |
virtual klassOop array_klass_impl(bool or_null, int rank, TRAPS);
|
|
518 |
virtual klassOop array_klass_impl(bool or_null, TRAPS);
|
|
519 |
|
|
520 |
public:
|
|
521 |
virtual void remove_unshareable_info();
|
|
522 |
|
|
523 |
protected:
|
|
524 |
// computes the subtype relationship
|
|
525 |
virtual bool compute_is_subtype_of(klassOop k);
|
|
526 |
public:
|
|
527 |
// subclass accessor (here for convenience; undefined for non-klass objects)
|
|
528 |
virtual bool is_leaf_class() const { fatal("not a class"); return false; }
|
|
529 |
public:
|
|
530 |
// ALL FUNCTIONS BELOW THIS POINT ARE DISPATCHED FROM AN OOP
|
|
531 |
// These functions describe behavior for the oop not the KLASS.
|
|
532 |
|
|
533 |
// actual oop size of obj in memory
|
|
534 |
virtual int oop_size(oop obj) const = 0;
|
|
535 |
|
|
536 |
// actual oop size of this klass in memory
|
|
537 |
virtual int klass_oop_size() const = 0;
|
|
538 |
|
|
539 |
// Returns the Java name for a class (Resource allocated)
|
|
540 |
// For arrays, this returns the name of the element with a leading '['.
|
|
541 |
// For classes, this returns the name with the package separators
|
|
542 |
// turned into '.'s.
|
|
543 |
const char* external_name() const;
|
|
544 |
// Returns the name for a class (Resource allocated) as the class
|
|
545 |
// would appear in a signature.
|
|
546 |
// For arrays, this returns the name of the element with a leading '['.
|
|
547 |
// For classes, this returns the name with a leading 'L' and a trailing ';'
|
|
548 |
// and the package separators as '/'.
|
|
549 |
virtual char* signature_name() const;
|
|
550 |
|
|
551 |
// garbage collection support
|
|
552 |
virtual void oop_follow_contents(oop obj) = 0;
|
|
553 |
virtual int oop_adjust_pointers(oop obj) = 0;
|
|
554 |
|
|
555 |
// Parallel Scavenge and Parallel Old
|
|
556 |
PARALLEL_GC_DECLS_PV
|
|
557 |
|
|
558 |
public:
|
|
559 |
// type testing operations
|
|
560 |
virtual bool oop_is_instance_slow() const { return false; }
|
|
561 |
virtual bool oop_is_instanceRef() const { return false; }
|
|
562 |
virtual bool oop_is_array() const { return false; }
|
|
563 |
virtual bool oop_is_objArray_slow() const { return false; }
|
|
564 |
virtual bool oop_is_symbol() const { return false; }
|
|
565 |
virtual bool oop_is_klass() const { return false; }
|
|
566 |
virtual bool oop_is_thread() const { return false; }
|
|
567 |
virtual bool oop_is_method() const { return false; }
|
|
568 |
virtual bool oop_is_constMethod() const { return false; }
|
|
569 |
virtual bool oop_is_methodData() const { return false; }
|
|
570 |
virtual bool oop_is_constantPool() const { return false; }
|
|
571 |
virtual bool oop_is_constantPoolCache() const { return false; }
|
|
572 |
virtual bool oop_is_typeArray_slow() const { return false; }
|
|
573 |
virtual bool oop_is_arrayKlass() const { return false; }
|
|
574 |
virtual bool oop_is_objArrayKlass() const { return false; }
|
|
575 |
virtual bool oop_is_typeArrayKlass() const { return false; }
|
|
576 |
virtual bool oop_is_compiledICHolder() const { return false; }
|
|
577 |
virtual bool oop_is_instanceKlass() const { return false; }
|
|
578 |
|
|
579 |
bool oop_is_javaArray_slow() const {
|
|
580 |
return oop_is_objArray_slow() || oop_is_typeArray_slow();
|
|
581 |
}
|
|
582 |
|
|
583 |
// Fast non-virtual versions, used by oop.inline.hpp and elsewhere:
|
|
584 |
#ifndef ASSERT
|
|
585 |
#define assert_same_query(xval, xcheck) xval
|
|
586 |
#else
|
|
587 |
private:
|
|
588 |
static bool assert_same_query(bool xval, bool xslow) {
|
|
589 |
assert(xval == xslow, "slow and fast queries agree");
|
|
590 |
return xval;
|
|
591 |
}
|
|
592 |
public:
|
|
593 |
#endif
|
|
594 |
inline bool oop_is_instance() const { return assert_same_query(
|
|
595 |
layout_helper_is_instance(layout_helper()),
|
|
596 |
oop_is_instance_slow()); }
|
|
597 |
inline bool oop_is_javaArray() const { return assert_same_query(
|
|
598 |
layout_helper_is_javaArray(layout_helper()),
|
|
599 |
oop_is_javaArray_slow()); }
|
|
600 |
inline bool oop_is_objArray() const { return assert_same_query(
|
|
601 |
layout_helper_is_objArray(layout_helper()),
|
|
602 |
oop_is_objArray_slow()); }
|
|
603 |
inline bool oop_is_typeArray() const { return assert_same_query(
|
|
604 |
layout_helper_is_typeArray(layout_helper()),
|
|
605 |
oop_is_typeArray_slow()); }
|
|
606 |
#undef assert_same_query
|
|
607 |
|
|
608 |
// Unless overridden, oop is parsable if it has a klass pointer.
|
|
609 |
virtual bool oop_is_parsable(oop obj) const { return true; }
|
|
610 |
|
|
611 |
// Access flags
|
|
612 |
AccessFlags access_flags() const { return _access_flags; }
|
|
613 |
void set_access_flags(AccessFlags flags) { _access_flags = flags; }
|
|
614 |
|
|
615 |
bool is_public() const { return _access_flags.is_public(); }
|
|
616 |
bool is_final() const { return _access_flags.is_final(); }
|
|
617 |
bool is_interface() const { return _access_flags.is_interface(); }
|
|
618 |
bool is_abstract() const { return _access_flags.is_abstract(); }
|
|
619 |
bool is_super() const { return _access_flags.is_super(); }
|
|
620 |
bool is_synthetic() const { return _access_flags.is_synthetic(); }
|
|
621 |
void set_is_synthetic() { _access_flags.set_is_synthetic(); }
|
|
622 |
bool has_finalizer() const { return _access_flags.has_finalizer(); }
|
|
623 |
bool has_final_method() const { return _access_flags.has_final_method(); }
|
|
624 |
void set_has_finalizer() { _access_flags.set_has_finalizer(); }
|
|
625 |
void set_has_final_method() { _access_flags.set_has_final_method(); }
|
|
626 |
bool is_cloneable() const { return _access_flags.is_cloneable(); }
|
|
627 |
void set_is_cloneable() { _access_flags.set_is_cloneable(); }
|
|
628 |
bool has_vanilla_constructor() const { return _access_flags.has_vanilla_constructor(); }
|
|
629 |
void set_has_vanilla_constructor() { _access_flags.set_has_vanilla_constructor(); }
|
|
630 |
bool has_miranda_methods () const { return access_flags().has_miranda_methods(); }
|
|
631 |
void set_has_miranda_methods() { _access_flags.set_has_miranda_methods(); }
|
|
632 |
|
|
633 |
// Biased locking support
|
|
634 |
// Note: the prototype header is always set up to be at least the
|
|
635 |
// prototype markOop. If biased locking is enabled it may further be
|
|
636 |
// biasable and have an epoch.
|
|
637 |
markOop prototype_header() const { return _prototype_header; }
|
|
638 |
// NOTE: once instances of this klass are floating around in the
|
|
639 |
// system, this header must only be updated at a safepoint.
|
|
640 |
// NOTE 2: currently we only ever set the prototype header to the
|
|
641 |
// biasable prototype for instanceKlasses. There is no technical
|
|
642 |
// reason why it could not be done for arrayKlasses aside from
|
|
643 |
// wanting to reduce the initial scope of this optimization. There
|
|
644 |
// are potential problems in setting the bias pattern for
|
|
645 |
// JVM-internal oops.
|
|
646 |
inline void set_prototype_header(markOop header);
|
|
647 |
static int prototype_header_offset_in_bytes() { return offset_of(Klass, _prototype_header); }
|
|
648 |
|
|
649 |
int biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; }
|
|
650 |
// Atomically increments biased_lock_revocation_count and returns updated value
|
|
651 |
int atomic_incr_biased_lock_revocation_count();
|
|
652 |
void set_biased_lock_revocation_count(int val) { _biased_lock_revocation_count = (jint) val; }
|
|
653 |
jlong last_biased_lock_bulk_revocation_time() { return _last_biased_lock_bulk_revocation_time; }
|
|
654 |
void set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; }
|
|
655 |
|
|
656 |
|
|
657 |
// garbage collection support
|
|
658 |
virtual void follow_weak_klass_links(
|
|
659 |
BoolObjectClosure* is_alive, OopClosure* keep_alive);
|
|
660 |
|
|
661 |
// Prefetch within oop iterators. This is a macro because we
|
|
662 |
// can't guarantee that the compiler will inline it. In 64-bit
|
|
663 |
// it generally doesn't. Signature is
|
|
664 |
//
|
|
665 |
// static void prefetch_beyond(oop* const start,
|
|
666 |
// oop* const end,
|
|
667 |
// const intx foffset,
|
|
668 |
// const Prefetch::style pstyle);
|
|
669 |
#define prefetch_beyond(start, end, foffset, pstyle) { \
|
|
670 |
const intx foffset_ = (foffset); \
|
|
671 |
const Prefetch::style pstyle_ = (pstyle); \
|
|
672 |
assert(foffset_ > 0, "prefetch beyond, not behind"); \
|
|
673 |
if (pstyle_ != Prefetch::do_none) { \
|
|
674 |
oop* ref = (start); \
|
|
675 |
if (ref < (end)) { \
|
|
676 |
switch (pstyle_) { \
|
|
677 |
case Prefetch::do_read: \
|
|
678 |
Prefetch::read(*ref, foffset_); \
|
|
679 |
break; \
|
|
680 |
case Prefetch::do_write: \
|
|
681 |
Prefetch::write(*ref, foffset_); \
|
|
682 |
break; \
|
|
683 |
default: \
|
|
684 |
ShouldNotReachHere(); \
|
|
685 |
break; \
|
|
686 |
} \
|
|
687 |
} \
|
|
688 |
} \
|
|
689 |
}
|
|
690 |
|
|
691 |
// iterators
|
|
692 |
virtual int oop_oop_iterate(oop obj, OopClosure* blk) = 0;
|
|
693 |
virtual int oop_oop_iterate_v(oop obj, OopClosure* blk) {
|
|
694 |
return oop_oop_iterate(obj, blk);
|
|
695 |
}
|
|
696 |
|
|
697 |
// Iterates "blk" over all the oops in "obj" (of type "this") within "mr".
|
|
698 |
// (I don't see why the _m should be required, but without it the Solaris
|
|
699 |
// C++ gives warning messages about overridings of the "oop_oop_iterate"
|
|
700 |
// defined above "hiding" this virtual function. (DLD, 6/20/00)) */
|
|
701 |
virtual int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) = 0;
|
|
702 |
virtual int oop_oop_iterate_v_m(oop obj, OopClosure* blk, MemRegion mr) {
|
|
703 |
return oop_oop_iterate_m(obj, blk, mr);
|
|
704 |
}
|
|
705 |
|
|
706 |
// Versions of the above iterators specialized to particular subtypes
|
|
707 |
// of OopClosure, to avoid closure virtual calls.
|
|
708 |
#define Klass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
|
|
709 |
virtual int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk) { \
|
|
710 |
/* Default implementation reverts to general version. */ \
|
|
711 |
return oop_oop_iterate(obj, blk); \
|
|
712 |
} \
|
|
713 |
\
|
|
714 |
/* Iterates "blk" over all the oops in "obj" (of type "this") within "mr". \
|
|
715 |
(I don't see why the _m should be required, but without it the Solaris \
|
|
716 |
C++ gives warning messages about overridings of the "oop_oop_iterate" \
|
|
717 |
defined above "hiding" this virtual function. (DLD, 6/20/00)) */ \
|
|
718 |
virtual int oop_oop_iterate##nv_suffix##_m(oop obj, \
|
|
719 |
OopClosureType* blk, \
|
|
720 |
MemRegion mr) { \
|
|
721 |
return oop_oop_iterate_m(obj, blk, mr); \
|
|
722 |
}
|
|
723 |
|
|
724 |
SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_1(Klass_OOP_OOP_ITERATE_DECL)
|
|
725 |
SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_3(Klass_OOP_OOP_ITERATE_DECL)
|
|
726 |
|
|
727 |
virtual void array_klasses_do(void f(klassOop k)) {}
|
|
728 |
virtual void with_array_klasses_do(void f(klassOop k));
|
|
729 |
|
|
730 |
// Return self, except for abstract classes with exactly 1
|
|
731 |
// implementor. Then return the 1 concrete implementation.
|
|
732 |
Klass *up_cast_abstract();
|
|
733 |
|
|
734 |
// klass name
|
|
735 |
symbolOop name() const { return _name; }
|
|
736 |
void set_name(symbolOop n) { oop_store_without_check((oop*) &_name, (oop) n); }
|
|
737 |
|
|
738 |
friend class klassKlass;
|
|
739 |
|
|
740 |
public:
|
|
741 |
// jvm support
|
|
742 |
virtual jint compute_modifier_flags(TRAPS) const;
|
|
743 |
|
|
744 |
public:
|
|
745 |
// JVMTI support
|
|
746 |
virtual jint jvmti_class_status() const;
|
|
747 |
|
|
748 |
#ifndef PRODUCT
|
|
749 |
public:
|
|
750 |
// Printing
|
|
751 |
virtual void oop_print_on (oop obj, outputStream* st);
|
|
752 |
virtual void oop_print_value_on(oop obj, outputStream* st);
|
|
753 |
#endif
|
|
754 |
|
|
755 |
public:
|
|
756 |
// Verification
|
|
757 |
virtual const char* internal_name() const = 0;
|
|
758 |
virtual void oop_verify_on(oop obj, outputStream* st);
|
|
759 |
virtual void oop_verify_old_oop(oop obj, oop* p, bool allow_dirty);
|
|
760 |
// tells whether obj is partially constructed (gc during class loading)
|
|
761 |
virtual bool oop_partially_loaded(oop obj) const { return false; }
|
|
762 |
virtual void oop_set_partially_loaded(oop obj) {};
|
|
763 |
|
|
764 |
#ifndef PRODUCT
|
|
765 |
void verify_vtable_index(int index);
|
|
766 |
#endif
|
|
767 |
};
|