--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/oops/oop.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,322 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// oopDesc is the top baseclass for objects classes. The {name}Desc classes describe
+// the format of Java objects so the fields can be accessed from C++.
+// oopDesc is abstract.
+// (see oopHierarchy for complete oop class hierarchy)
+//
+// no virtual functions allowed
+
+// store into oop with store check
+void oop_store(oop* p, oop v);
+void oop_store(volatile oop* p, oop v);
+
+// store into oop without store check
+void oop_store_without_check(oop* p, oop v);
+void oop_store_without_check(volatile oop* p, oop v);
+
+
+extern bool always_do_update_barrier;
+
+// Forward declarations.
+class OopClosure;
+class ScanClosure;
+class FastScanClosure;
+class FilteringClosure;
+class BarrierSet;
+class CMSIsAliveClosure;
+
+class PSPromotionManager;
+class ParCompactionManager;
+
+class oopDesc {
+ friend class VMStructs;
+ private:
+ volatile markOop _mark;
+ klassOop _klass;
+
+ // Fast access to barrier set. Must be initialized.
+ static BarrierSet* _bs;
+
+ public:
+ markOop mark() const { return _mark; }
+ markOop* mark_addr() const { return (markOop*) &_mark; }
+
+ void set_mark(volatile markOop m) { _mark = m; }
+
+ void release_set_mark(markOop m);
+ markOop cas_set_mark(markOop new_mark, markOop old_mark);
+
+ // Used only to re-initialize the mark word (e.g., of promoted
+ // objects during a GC) -- requires a valid klass pointer
+ void init_mark();
+
+ klassOop klass() const { return _klass; }
+ oop* klass_addr() const { return (oop*) &_klass; }
+
+ void set_klass(klassOop k);
+ // For when the klass pointer is being used as a linked list "next" field.
+ void set_klass_to_list_ptr(oop k);
+
+ // size of object header
+ static int header_size() { return sizeof(oopDesc)/HeapWordSize; }
+ static int header_size_in_bytes() { return sizeof(oopDesc); }
+
+ Klass* blueprint() const;
+
+ // Returns whether this is an instance of k or an instance of a subclass of k
+ bool is_a(klassOop k) const;
+
+ // Returns the actual oop size of the object
+ int size();
+
+ // Sometimes (for complicated concurrency-related reasons), it is useful
+ // to be able to figure out the size of an object knowing its klass.
+ int size_given_klass(Klass* klass);
+
+ // Some perm gen objects are not parseble immediately after
+ // installation of their klass pointer.
+ bool is_parsable();
+
+ // type test operations (inlined in oop.inline.h)
+ bool is_instance() const;
+ bool is_instanceRef() const;
+ bool is_array() const;
+ bool is_objArray() const;
+ bool is_symbol() const;
+ bool is_klass() const;
+ bool is_thread() const;
+ bool is_method() const;
+ bool is_constMethod() const;
+ bool is_methodData() const;
+ bool is_constantPool() const;
+ bool is_constantPoolCache() const;
+ bool is_typeArray() const;
+ bool is_javaArray() const;
+ bool is_compiledICHolder() const;
+
+ private:
+ // field addresses in oop
+ // byte/char/bool/short fields are always stored as full words
+ void* field_base(int offset) const;
+
+ jbyte* byte_field_addr(int offset) const;
+ jchar* char_field_addr(int offset) const;
+ jboolean* bool_field_addr(int offset) const;
+ jint* int_field_addr(int offset) const;
+ jshort* short_field_addr(int offset) const;
+ jlong* long_field_addr(int offset) const;
+ jfloat* float_field_addr(int offset) const;
+ jdouble* double_field_addr(int offset) const;
+
+ public:
+ // need this as public for garbage collection
+ oop* obj_field_addr(int offset) const;
+
+ oop obj_field(int offset) const;
+ void obj_field_put(int offset, oop value);
+
+ jbyte byte_field(int offset) const;
+ void byte_field_put(int offset, jbyte contents);
+
+ jchar char_field(int offset) const;
+ void char_field_put(int offset, jchar contents);
+
+ jboolean bool_field(int offset) const;
+ void bool_field_put(int offset, jboolean contents);
+
+ jint int_field(int offset) const;
+ void int_field_put(int offset, jint contents);
+
+ jshort short_field(int offset) const;
+ void short_field_put(int offset, jshort contents);
+
+ jlong long_field(int offset) const;
+ void long_field_put(int offset, jlong contents);
+
+ jfloat float_field(int offset) const;
+ void float_field_put(int offset, jfloat contents);
+
+ jdouble double_field(int offset) const;
+ void double_field_put(int offset, jdouble contents);
+
+ oop obj_field_acquire(int offset) const;
+ void release_obj_field_put(int offset, oop value);
+
+ jbyte byte_field_acquire(int offset) const;
+ void release_byte_field_put(int offset, jbyte contents);
+
+ jchar char_field_acquire(int offset) const;
+ void release_char_field_put(int offset, jchar contents);
+
+ jboolean bool_field_acquire(int offset) const;
+ void release_bool_field_put(int offset, jboolean contents);
+
+ jint int_field_acquire(int offset) const;
+ void release_int_field_put(int offset, jint contents);
+
+ jshort short_field_acquire(int offset) const;
+ void release_short_field_put(int offset, jshort contents);
+
+ jlong long_field_acquire(int offset) const;
+ void release_long_field_put(int offset, jlong contents);
+
+ jfloat float_field_acquire(int offset) const;
+ void release_float_field_put(int offset, jfloat contents);
+
+ jdouble double_field_acquire(int offset) const;
+ void release_double_field_put(int offset, jdouble contents);
+
+ // printing functions for VM debugging
+ void print_on(outputStream* st) const; // First level print
+ void print_value_on(outputStream* st) const; // Second level print.
+ void print_address_on(outputStream* st) const; // Address printing
+
+ // printing on default output stream
+ void print();
+ void print_value();
+ void print_address();
+
+ // return the print strings
+ char* print_string();
+ char* print_value_string();
+
+ // verification operations
+ void verify_on(outputStream* st);
+ void verify();
+ void verify_old_oop(oop* p, bool allow_dirty);
+
+ // tells whether this oop is partially constructed (gc during class loading)
+ bool partially_loaded();
+ void set_partially_loaded();
+
+ // locking operations
+ bool is_locked() const;
+ bool is_unlocked() const;
+ bool has_bias_pattern() const;
+
+ // asserts
+ bool is_oop(bool ignore_mark_word = false) const;
+ bool is_oop_or_null(bool ignore_mark_word = false) const;
+#ifndef PRODUCT
+ bool is_unlocked_oop() const;
+#endif
+
+ // garbage collection
+ bool is_gc_marked() const;
+ // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL
+ // reference field in "this".
+ void follow_contents();
+ void follow_header();
+
+#ifndef SERIALGC
+ // Parallel Scavenge
+ void copy_contents(PSPromotionManager* pm);
+ void push_contents(PSPromotionManager* pm);
+
+ // Parallel Old
+ void update_contents(ParCompactionManager* cm);
+ void update_contents(ParCompactionManager* cm,
+ HeapWord* begin_limit,
+ HeapWord* end_limit);
+ void update_contents(ParCompactionManager* cm,
+ klassOop old_klass,
+ HeapWord* begin_limit,
+ HeapWord* end_limit);
+
+ void follow_contents(ParCompactionManager* cm);
+ void follow_header(ParCompactionManager* cm);
+#endif // SERIALGC
+
+ bool is_perm() const;
+ bool is_perm_or_null() const;
+ bool is_shared() const;
+ bool is_shared_readonly() const;
+ bool is_shared_readwrite() const;
+
+ // Forward pointer operations for scavenge
+ bool is_forwarded() const;
+
+ void forward_to(oop p);
+ bool cas_forward_to(oop p, markOop compare);
+
+#ifndef SERIALGC
+ // Like "forward_to", but inserts the forwarding pointer atomically.
+ // Exactly one thread succeeds in inserting the forwarding pointer, and
+ // this call returns "NULL" for that thread; any other thread has the
+ // value of the forwarding pointer returned and does not modify "this".
+ oop forward_to_atomic(oop p);
+#endif // SERIALGC
+
+ oop forwardee() const;
+
+ // Age of object during scavenge
+ int age() const;
+ void incr_age();
+
+ // Adjust all pointers in this object to point at it's forwarded location and
+ // return the size of this oop. This is used by the MarkSweep collector.
+ int adjust_pointers();
+ void adjust_header();
+
+#ifndef SERIALGC
+ // Parallel old
+ void update_header();
+ void update_header(HeapWord* beg_addr, HeapWord* end_addr);
+#endif // SERIALGC
+
+ // mark-sweep support
+ void follow_body(int begin, int end);
+
+ // Fast access to barrier set
+ static BarrierSet* bs() { return _bs; }
+ static void set_bs(BarrierSet* bs) { _bs = bs; }
+
+ // iterators, returns size of object
+#define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
+ int oop_iterate(OopClosureType* blk); \
+ int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr.
+
+ ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL)
+ ALL_OOP_OOP_ITERATE_CLOSURES_3(OOP_ITERATE_DECL)
+
+ void oop_iterate_header(OopClosure* blk);
+ void oop_iterate_header(OopClosure* blk, MemRegion mr);
+
+ // identity hash; returns the identity hash key (computes it if necessary)
+ // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a
+ // safepoint if called on a biased object. Calling code must be aware of that.
+ intptr_t identity_hash();
+ intptr_t slow_identity_hash();
+
+ // marks are forwarded to stack when object is locked
+ bool has_displaced_mark() const;
+ markOop displaced_mark() const;
+ void set_displaced_mark(markOop m);
+
+ // for code generation
+ static int klass_offset_in_bytes() { return offset_of(oopDesc, _klass); }
+ static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); }
+};