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comparison src/share/vm/oops/constantPoolOop.hpp @ 113:ba764ed4b6f2

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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author coleenp
date Sun, 13 Apr 2008 17:43:42 -0400
parents a61af66fc99e
children d1605aabd0a1
comparison
equal deleted inserted replaced
110:a49a647afe9a 113:ba764ed4b6f2
32 // the entry in the constant pool is a klass or String object and 32 // the entry in the constant pool is a klass or String object and
33 // not a symbolOop. 33 // not a symbolOop.
34 34
35 class SymbolHashMap; 35 class SymbolHashMap;
36 36
37 class constantPoolOopDesc : public arrayOopDesc { 37 class constantPoolOopDesc : public oopDesc {
38 friend class VMStructs; 38 friend class VMStructs;
39 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast 39 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast
40 private: 40 private:
41 typeArrayOop _tags; // the tag array describing the constant pool's contents 41 typeArrayOop _tags; // the tag array describing the constant pool's contents
42 constantPoolCacheOop _cache; // the cache holding interpreter runtime information 42 constantPoolCacheOop _cache; // the cache holding interpreter runtime information
43 klassOop _pool_holder; // the corresponding class 43 klassOop _pool_holder; // the corresponding class
44 int _length; // number of elements in the array
44 // only set to non-zero if constant pool is merged by RedefineClasses 45 // only set to non-zero if constant pool is merged by RedefineClasses
45 int _orig_length; 46 int _orig_length;
46 47
47 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); } 48 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); }
48 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); } 49 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); }
328 329
329 // Klass name matches name at offset 330 // Klass name matches name at offset
330 bool klass_name_at_matches(instanceKlassHandle k, int which); 331 bool klass_name_at_matches(instanceKlassHandle k, int which);
331 332
332 // Sizing 333 // Sizing
334 int length() const { return _length; }
335 void set_length(int length) { _length = length; }
336
337 // Tells whether index is within bounds.
338 bool is_within_bounds(int index) const {
339 return 0 <= index && index < length();
340 }
341
333 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; } 342 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; }
334 static int object_size(int length) { return align_object_size(header_size() + length); } 343 static int object_size(int length) { return align_object_size(header_size() + length); }
335 int object_size() { return object_size(length()); } 344 int object_size() { return object_size(length()); }
336 345
337 friend class constantPoolKlass; 346 friend class constantPoolKlass;