Mon, 09 Jun 2008 11:51:19 -0400
6687581: Make CMS work with compressed oops
Summary: Make FreeChunk read markword instead of LSB in _klass pointer to indicate that it's a FreeChunk for compressed oops.
Reviewed-by: ysr, jmasa
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // a symbolKlass is the klass for a symbolOop |
duke@435 | 26 | |
duke@435 | 27 | class symbolKlass : public Klass { |
duke@435 | 28 | friend class VMStructs; |
duke@435 | 29 | private: |
duke@435 | 30 | juint _alloc_size; // allocation profiling support |
duke@435 | 31 | public: |
duke@435 | 32 | // Allocation |
duke@435 | 33 | DEFINE_ALLOCATE_PERMANENT(symbolKlass); |
duke@435 | 34 | static klassOop create_klass(TRAPS); |
duke@435 | 35 | symbolOop allocate_symbol(u1* name, int len, TRAPS); // Assumes no characters larger than 0x7F |
duke@435 | 36 | bool allocate_symbols(int names_count, const char** names, int* lengths, symbolOop* sym_oops, TRAPS); |
duke@435 | 37 | |
duke@435 | 38 | // Test operation |
duke@435 | 39 | bool oop_is_symbol() const { return true; } |
duke@435 | 40 | |
duke@435 | 41 | // Casting from klassOop |
duke@435 | 42 | static symbolKlass* cast(klassOop k) { |
duke@435 | 43 | assert(k->klass_part()->oop_is_symbol(), "cast to symbolKlass"); |
duke@435 | 44 | return (symbolKlass*) k->klass_part(); |
duke@435 | 45 | } |
duke@435 | 46 | |
duke@435 | 47 | static int header_size() { return oopDesc::header_size() + sizeof(symbolKlass)/HeapWordSize; } |
duke@435 | 48 | int oop_size(oop obj) const; |
duke@435 | 49 | int klass_oop_size() const { return object_size(); } |
duke@435 | 50 | int object_size() const { return align_object_size(header_size()); } |
duke@435 | 51 | |
duke@435 | 52 | // Garbage collection |
duke@435 | 53 | void oop_follow_contents(oop obj); |
duke@435 | 54 | int oop_adjust_pointers(oop obj); |
duke@435 | 55 | bool oop_is_parsable(oop obj) const; |
duke@435 | 56 | |
duke@435 | 57 | // Parallel Scavenge and Parallel Old |
duke@435 | 58 | PARALLEL_GC_DECLS |
duke@435 | 59 | |
duke@435 | 60 | // Allocation profiling support |
duke@435 | 61 | juint alloc_size() const { return _alloc_size; } |
duke@435 | 62 | void set_alloc_size(juint n) { _alloc_size = n; } |
duke@435 | 63 | |
duke@435 | 64 | // Iterators |
duke@435 | 65 | int oop_oop_iterate(oop obj, OopClosure* blk); |
duke@435 | 66 | int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr); |
duke@435 | 67 | |
duke@435 | 68 | #ifndef PRODUCT |
duke@435 | 69 | // Printing |
duke@435 | 70 | void oop_print_value_on(oop obj, outputStream* st); |
duke@435 | 71 | void oop_print_on(oop obj, outputStream* st); |
duke@435 | 72 | #endif |
duke@435 | 73 | const char* internal_name() const; |
duke@435 | 74 | }; |