Tue, 15 Nov 2011 20:17:33 +0100
7110152: assert(size_in_words <= (julong)max_jint) failed: no overflow
Summary: Reduce what arrayOopDesc::max_array_length() returns to avoid int overflow
Reviewed-by: kvn, dholmes, tonyp
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25 #ifndef SHARE_VM_OOPS_OBJARRAYKLASS_HPP
26 #define SHARE_VM_OOPS_OBJARRAYKLASS_HPP
28 #include "memory/specialized_oop_closures.hpp"
29 #include "oops/arrayKlass.hpp"
30 #include "oops/instanceKlass.hpp"
32 // objArrayKlass is the klass for objArrays
34 class objArrayKlass : public arrayKlass {
35 friend class VMStructs;
36 private:
37 klassOop _element_klass; // The klass of the elements of this array type
38 klassOop _bottom_klass; // The one-dimensional type (instanceKlass or typeArrayKlass)
39 public:
40 // Instance variables
41 klassOop element_klass() const { return _element_klass; }
42 void set_element_klass(klassOop k) { oop_store_without_check((oop*) &_element_klass, (oop) k); }
43 oop* element_klass_addr() { return (oop*)&_element_klass; }
45 klassOop bottom_klass() const { return _bottom_klass; }
46 void set_bottom_klass(klassOop k) { oop_store_without_check((oop*) &_bottom_klass, (oop) k); }
47 oop* bottom_klass_addr() { return (oop*)&_bottom_klass; }
49 // Compiler/Interpreter offset
50 static int element_klass_offset_in_bytes() { return offset_of(objArrayKlass, _element_klass); }
52 // Dispatched operation
53 bool can_be_primary_super_slow() const;
54 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
55 bool compute_is_subtype_of(klassOop k);
56 bool oop_is_objArray_slow() const { return true; }
57 int oop_size(oop obj) const;
58 int klass_oop_size() const { return object_size(); }
60 // Allocation
61 DEFINE_ALLOCATE_PERMANENT(objArrayKlass);
62 objArrayOop allocate(int length, TRAPS);
63 oop multi_allocate(int rank, jint* sizes, TRAPS);
65 // Copying
66 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
68 // Compute protection domain
69 oop protection_domain() { return Klass::cast(bottom_klass())->protection_domain(); }
70 // Compute class loader
71 oop class_loader() const { return Klass::cast(bottom_klass())->class_loader(); }
73 private:
74 // Either oop or narrowOop depending on UseCompressedOops.
75 // must be called from within objArrayKlass.cpp
76 template <class T> void do_copy(arrayOop s, T* src, arrayOop d,
77 T* dst, int length, TRAPS);
78 protected:
79 // Returns the objArrayKlass for n'th dimension.
80 virtual klassOop array_klass_impl(bool or_null, int n, TRAPS);
82 // Returns the array class with this class as element type.
83 virtual klassOop array_klass_impl(bool or_null, TRAPS);
85 public:
86 // Casting from klassOop
87 static objArrayKlass* cast(klassOop k) {
88 assert(k->klass_part()->oop_is_objArray_slow(), "cast to objArrayKlass");
89 return (objArrayKlass*) k->klass_part();
90 }
92 // Sizing
93 static int header_size() { return oopDesc::header_size() + sizeof(objArrayKlass)/HeapWordSize; }
94 int object_size() const { return arrayKlass::object_size(header_size()); }
96 // Initialization (virtual from Klass)
97 void initialize(TRAPS);
99 // Garbage collection
100 void oop_follow_contents(oop obj);
101 inline void oop_follow_contents(oop obj, int index);
102 template <class T> inline void objarray_follow_contents(oop obj, int index);
104 int oop_adjust_pointers(oop obj);
106 // Parallel Scavenge and Parallel Old
107 PARALLEL_GC_DECLS
108 #ifndef SERIALGC
109 inline void oop_follow_contents(ParCompactionManager* cm, oop obj, int index);
110 template <class T> inline void
111 objarray_follow_contents(ParCompactionManager* cm, oop obj, int index);
112 #endif // !SERIALGC
114 // Iterators
115 int oop_oop_iterate(oop obj, OopClosure* blk) {
116 return oop_oop_iterate_v(obj, blk);
117 }
118 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
119 return oop_oop_iterate_v_m(obj, blk, mr);
120 }
121 #define ObjArrayKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
122 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
123 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
124 MemRegion mr); \
125 int oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* blk, \
126 int start, int end);
128 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
129 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
131 // JVM support
132 jint compute_modifier_flags(TRAPS) const;
134 private:
135 static klassOop array_klass_impl (objArrayKlassHandle this_oop, bool or_null, int n, TRAPS);
137 public:
138 // Printing
139 void oop_print_value_on(oop obj, outputStream* st);
140 #ifndef PRODUCT
141 void oop_print_on (oop obj, outputStream* st);
142 #endif //PRODUCT
144 // Verification
145 const char* internal_name() const;
146 void oop_verify_on(oop obj, outputStream* st);
147 void oop_verify_old_oop(oop obj, oop* p, bool allow_dirty);
148 void oop_verify_old_oop(oop obj, narrowOop* p, bool allow_dirty);
149 };
151 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP