97 }
98
99 // When String table needs to rehash
100 unsigned int oopDesc::new_hash(juint seed) {
101 EXCEPTION_MARK;
102 ResourceMark rm;
103 int length;
104 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
105 if (chars != NULL) {
106 // Use alternate hashing algorithm on the string
107 return AltHashing::murmur3_32(seed, chars, length);
108 } else {
109 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
110 return 0;
111 }
112 }
113
114 // used only for asserts and guarantees
115 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
116 if (!Universe::heap()->is_oop(obj)) {
117 assert(obj->klass()->is_value(), "Only value type can be outside of the Java heap");
118 VTBufferChunk* chunk = VTBufferChunk::chunk(obj);
119 assert(chunk->is_valid(), "if not in the heap, should a buffered VT");
120 if (!VTBuffer::is_in_vt_buffer(obj)) return false;
121 }
122
123 // Header verification: the mark is typically non-NULL. If we're
124 // at a safepoint, it must not be null.
125 // Outside of a safepoint, the header could be changing (for example,
126 // another thread could be inflating a lock on this object).
127 if (ignore_mark_word) {
128 return true;
129 }
130 if (obj->mark_raw() != NULL) {
131 return true;
132 }
133 return !SafepointSynchronize::is_at_safepoint()
134 || (obj->klass()->is_value() && VTBuffer::is_in_vt_buffer(obj)) ;
135 }
136
137 // used only for asserts and guarantees
138 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
139 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
140 }
141
142 #ifndef PRODUCT
143 // used only for asserts
144 bool oopDesc::is_unlocked_oop() const {
145 if (!Universe::heap()->is_in_reserved(this)) return false;
146 return mark()->is_unlocked();
147 }
148 #endif // PRODUCT
149
150 VerifyOopClosure VerifyOopClosure::verify_oop;
151
152 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
153 oop obj = RawAccess<>::oop_load(p);
154 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
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97 }
98
99 // When String table needs to rehash
100 unsigned int oopDesc::new_hash(juint seed) {
101 EXCEPTION_MARK;
102 ResourceMark rm;
103 int length;
104 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
105 if (chars != NULL) {
106 // Use alternate hashing algorithm on the string
107 return AltHashing::murmur3_32(seed, chars, length);
108 } else {
109 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
110 return 0;
111 }
112 }
113
114 // used only for asserts and guarantees
115 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
116 if (!Universe::heap()->is_oop(obj)) {
117 return false;
118 }
119
120 // Header verification: the mark is typically non-NULL. If we're
121 // at a safepoint, it must not be null.
122 // Outside of a safepoint, the header could be changing (for example,
123 // another thread could be inflating a lock on this object).
124 if (ignore_mark_word) {
125 return true;
126 }
127 if (obj->mark_raw() != NULL) {
128 return true;
129 }
130 return !SafepointSynchronize::is_at_safepoint() ;
131 }
132
133 // used only for asserts and guarantees
134 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
135 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
136 }
137
138 #ifndef PRODUCT
139 // used only for asserts
140 bool oopDesc::is_unlocked_oop() const {
141 if (!Universe::heap()->is_in_reserved(this)) return false;
142 return mark()->is_unlocked();
143 }
144 #endif // PRODUCT
145
146 VerifyOopClosure VerifyOopClosure::verify_oop;
147
148 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
149 oop obj = RawAccess<>::oop_load(p);
150 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
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