Fri, 20 Sep 2013 09:30:02 -0400
8022887: Assertion hit while using class and redefining it with RedefineClasses simultaneously
Summary: Need to refetch each method from InstanceKlass after all safepoints. Removed leaky PreviousVersionInfo code.
Reviewed-by: dcubed, sspitsyn
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
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25 #ifndef SHARE_VM_OOPS_ARRAYKLASS_HPP
26 #define SHARE_VM_OOPS_ARRAYKLASS_HPP
28 #include "memory/universe.hpp"
29 #include "oops/klass.hpp"
31 class klassVtable;
33 // ArrayKlass is the abstract baseclass for all array classes
35 class ArrayKlass: public Klass {
36 friend class VMStructs;
37 private:
38 int _dimension; // This is n'th-dimensional array.
39 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present).
40 Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present).
41 int _vtable_len; // size of vtable for this klass
42 oop _component_mirror; // component type, as a java/lang/Class
44 protected:
45 // Constructors
46 // The constructor with the Symbol argument does the real array
47 // initialization, the other is a dummy
48 ArrayKlass(Symbol* name);
49 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); }
51 public:
52 // Testing operation
53 bool oop_is_array_slow() const { return true; }
55 // Instance variables
56 int dimension() const { return _dimension; }
57 void set_dimension(int dimension) { _dimension = dimension; }
59 Klass* higher_dimension() const { return _higher_dimension; }
60 void set_higher_dimension(Klass* k) { _higher_dimension = k; }
61 Klass** adr_higher_dimension() { return (Klass**)&this->_higher_dimension;}
63 Klass* lower_dimension() const { return _lower_dimension; }
64 void set_lower_dimension(Klass* k) { _lower_dimension = k; }
65 Klass** adr_lower_dimension() { return (Klass**)&this->_lower_dimension;}
67 // offset of first element, including any padding for the sake of alignment
68 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }
69 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); }
70 // type of elements (T_OBJECT for both oop arrays and array-arrays)
71 BasicType element_type() const { return layout_helper_element_type(layout_helper()); }
73 oop component_mirror() const { return _component_mirror; }
74 void set_component_mirror(oop m) { klass_oop_store(&_component_mirror, m); }
75 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;}
77 // Compiler/Interpreter offset
78 static ByteSize component_mirror_offset() { return in_ByteSize(offset_of(ArrayKlass, _component_mirror)); }
80 virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); }
82 // Allocation
83 // Sizes points to the first dimension of the array, subsequent dimensions
84 // are always in higher memory. The callers of these set that up.
85 virtual oop multi_allocate(int rank, jint* sizes, TRAPS);
86 objArrayOop allocate_arrayArray(int n, int length, TRAPS);
88 // Lookup operations
89 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
91 // Casting from Klass*
92 static ArrayKlass* cast(Klass* k) {
93 assert(k->oop_is_array(), "cast to ArrayKlass");
94 return (ArrayKlass*) k;
95 }
97 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
98 bool compute_is_subtype_of(Klass* k);
100 // Sizing
101 static int header_size() { return sizeof(ArrayKlass)/HeapWordSize; }
102 static int static_size(int header_size);
104 #if INCLUDE_SERVICES
105 virtual void collect_statistics(KlassSizeStats *sz) const {
106 Klass::collect_statistics(sz);
107 // Do nothing for now, but remember to modify if you add new
108 // stuff to ArrayKlass.
109 }
110 #endif
112 // Java vtable
113 klassVtable* vtable() const; // return new klassVtable
114 int vtable_length() const { return _vtable_len; }
115 static int base_vtable_length() { return Universe::base_vtable_size(); }
116 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; }
117 protected:
118 inline intptr_t* start_of_vtable() const;
120 public:
121 // Iterators
122 void array_klasses_do(void f(Klass* k));
123 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
125 // GC support
126 virtual void oops_do(OopClosure* cl);
128 // Return a handle.
129 static void complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS);
132 // jvm support
133 jint compute_modifier_flags(TRAPS) const;
135 // JVMTI support
136 jint jvmti_class_status() const;
138 // CDS support - remove and restore oops from metadata. Oops are not shared.
139 virtual void remove_unshareable_info();
140 virtual void restore_unshareable_info(TRAPS);
142 // Printing
143 void print_on(outputStream* st) const;
144 void print_value_on(outputStream* st) const;
146 void oop_print_on(oop obj, outputStream* st);
148 // Verification
149 void verify_on(outputStream* st, bool check_dictionary);
151 void oop_verify_on(oop obj, outputStream* st);
152 };
154 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP