1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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12 * version 2 for more details (a copy is included in the LICENSE file that
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24
25 #ifndef SHARE_OOPS_ARRAYKLASS_HPP
26 #define SHARE_OOPS_ARRAYKLASS_HPP
27
28 #include "memory/universe.hpp"
29 #include "oops/klass.hpp"
30
31 class fieldDescriptor;
32 class klassVtable;
33
34 // ArrayKlass is the abstract baseclass for all array classes
35
36 class ArrayKlass: public Klass {
37 friend class VMStructs;
38 private:
39 // If you add a new field that points to any metaspace object, you
40 // must add this field to ArrayKlass::metaspace_pointers_do().
41 int _dimension; // This is n'th-dimensional array.
42 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present).
43 Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present).
44
45 protected:
46 Klass* _element_klass; // The klass of the elements of this array type
47 // The element type must be registered for both object arrays
48 // (incl. object arrays with value type elements) and value type
49 // arrays containing flattened value types. However, the element
50 // type must not be registered for arrays of primitive types.
51 // TODO: Update the class hierarchy so that element klass appears
52 // only in array that contain non-primitive types.
53 // Constructors
54 // The constructor with the Symbol argument does the real array
55 // initialization, the other is a dummy
56 ArrayKlass(Symbol* name, KlassID id);
57 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); }
58
59 // Create array_name for element klass, creates a permanent symbol, returns result
60 static Symbol* create_element_klass_array_name(Klass* element_klass, TRAPS);
61
62 public:
63 // Instance variables
64 virtual Klass* element_klass() const { return _element_klass; }
65 virtual void set_element_klass(Klass* k) { _element_klass = k; }
66
67 // Compiler/Interpreter offset
68 static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ArrayKlass, _element_klass)); }
69
70 // Testing operation
71 DEBUG_ONLY(bool is_array_klass_slow() const { return true; })
72
73 // Instance variables
74 int dimension() const { return _dimension; }
75 void set_dimension(int dimension) { _dimension = dimension; }
76
77 Klass* higher_dimension() const { return _higher_dimension; }
78 inline Klass* higher_dimension_acquire() const; // load with acquire semantics
79 void set_higher_dimension(Klass* k) { _higher_dimension = k; }
80 inline void release_set_higher_dimension(Klass* k); // store with release semantics
81
82 Klass* lower_dimension() const { return _lower_dimension; }
83 void set_lower_dimension(Klass* k) { _lower_dimension = k; }
84
85 // offset of first element, including any padding for the sake of alignment
86 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }
87 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); }
88 // type of elements (T_OBJECT for both oop arrays and array-arrays)
89 BasicType element_type() const { return layout_helper_element_type(layout_helper()); }
90
91 virtual InstanceKlass* java_super() const;//{ return SystemDictionary::Object_klass(); }
92
93 // Allocation
94 // Sizes points to the first dimension of the array, subsequent dimensions
95 // are always in higher memory. The callers of these set that up.
96 virtual oop multi_allocate(int rank, jint* sizes, TRAPS);
97 objArrayOop allocate_arrayArray(int n, int length, TRAPS);
98
99 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
100 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
101
102 // Lookup operations
103 Method* uncached_lookup_method(const Symbol* name,
104 const Symbol* signature,
105 OverpassLookupMode overpass_mode,
106 PrivateLookupMode private_mode = find_private) const;
107
108 static ArrayKlass* cast(Klass* k) {
109 return const_cast<ArrayKlass*>(cast(const_cast<const Klass*>(k)));
110 }
111
112 static const ArrayKlass* cast(const Klass* k) {
113 assert(k->is_array_klass(), "cast to ArrayKlass");
114 return static_cast<const ArrayKlass*>(k);
115 }
116
117 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
118 Array<InstanceKlass*>* transitive_interfaces);
119
120 // Sizing
121 static int static_size(int header_size);
122
123 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
124
125 #if INCLUDE_SERVICES
126 virtual void collect_statistics(KlassSizeStats *sz) const {
127 Klass::collect_statistics(sz);
128 // Do nothing for now, but remember to modify if you add new
129 // stuff to ArrayKlass.
130 }
131 #endif
132
133 // Iterators
134 void array_klasses_do(void f(Klass* k));
135 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
136
137 // Return a handle.
138 static void complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module, TRAPS);
139
140
141 // jvm support
142 jint compute_modifier_flags(TRAPS) const;
143
144 // JVMTI support
145 jint jvmti_class_status() const;
146
147 // CDS support - remove and restore oops from metadata. Oops are not shared.
148 virtual void remove_unshareable_info();
149 virtual void remove_java_mirror();
150 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
151
152 // Printing
153 void print_on(outputStream* st) const;
154 void print_value_on(outputStream* st) const;
155
156 void oop_print_on(oop obj, outputStream* st);
157
158 // Verification
159 void verify_on(outputStream* st);
160
161 void oop_verify_on(oop obj, outputStream* st);
162 };
163
164 #endif // SHARE_OOPS_ARRAYKLASS_HPP
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