58 #ifdef _LP64
59 if (type == T_OBJECT || type == T_ARRAY) {
60 return !UseCompressedOops;
61 }
62 #endif
63 return type == T_DOUBLE || type == T_LONG;
64 }
65
66 public:
67 // Header size computation.
68 // The header is considered the oop part of this type plus the length.
69 // This is not equivalent to sizeof(arrayOopDesc) which should not appear in the code.
70 static int header_size_in_bytes() {
71 int hs = length_offset_in_bytes() + (int)sizeof(int);
72 #ifdef ASSERT
73 // make sure it isn't called before UseCompressedOops is initialized.
74 static int arrayoopdesc_hs = 0;
75 if (arrayoopdesc_hs == 0) arrayoopdesc_hs = hs;
76 assert(arrayoopdesc_hs == hs, "header size can't change");
77 #endif // ASSERT
78 return (int)hs;
79 }
80
81 // The _length field is not declared in C++. It is allocated after the
82 // mark-word when using compact headers (+UseCompactObjectHeaders), otherwise
83 // after the compressed Klass* when running with compressed class-pointers
84 // (+UseCompressedClassPointers), or else after the full Klass*.
85 static int length_offset_in_bytes() {
86 return oopDesc::base_offset_in_bytes();
87 }
88
89 // Returns the offset of the first element.
90 static int base_offset_in_bytes(BasicType type) {
91 int hs = header_size_in_bytes();
92 return element_type_should_be_aligned(type) ? align_up(hs, BytesPerLong) : hs;
93 }
94
95 // Returns the address of the first element. The elements in the array will not
96 // relocate from this address until a subsequent thread transition.
97 void* base(BasicType type) const {
98 return reinterpret_cast<void*>(cast_from_oop<intptr_t>(as_oop()) + base_offset_in_bytes(type));
99 }
100
101 template <typename T>
102 static T* obj_offset_to_raw(arrayOop obj, size_t offset_in_bytes, T* raw) {
103 if (obj != nullptr) {
104 assert(raw == nullptr, "either raw or in-heap");
105 char* base = reinterpret_cast<char*>((void*) obj);
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58 #ifdef _LP64
59 if (type == T_OBJECT || type == T_ARRAY) {
60 return !UseCompressedOops;
61 }
62 #endif
63 return type == T_DOUBLE || type == T_LONG;
64 }
65
66 public:
67 // Header size computation.
68 // The header is considered the oop part of this type plus the length.
69 // This is not equivalent to sizeof(arrayOopDesc) which should not appear in the code.
70 static int header_size_in_bytes() {
71 int hs = length_offset_in_bytes() + (int)sizeof(int);
72 #ifdef ASSERT
73 // make sure it isn't called before UseCompressedOops is initialized.
74 static int arrayoopdesc_hs = 0;
75 if (arrayoopdesc_hs == 0) arrayoopdesc_hs = hs;
76 assert(arrayoopdesc_hs == hs, "header size can't change");
77 #endif // ASSERT
78 assert(!UseCompactObjectHeaders || hs == 8, "array header must be 8 bytes");
79 return (int)hs;
80 }
81
82 // The _length field is not declared in C++. It is allocated after the
83 // mark-word when using compact headers (+UseCompactObjectHeaders), otherwise
84 // after the compressed Klass* when running with compressed class-pointers
85 // (+UseCompressedClassPointers), or else after the full Klass*.
86 static int length_offset_in_bytes() {
87 assert(!UseCompactObjectHeaders || oopDesc::base_offset_in_bytes() == 4, "array length must be at 4 bytes");
88 return oopDesc::base_offset_in_bytes();
89 }
90
91 // Returns the offset of the first element.
92 static int base_offset_in_bytes(BasicType type) {
93 int hs = header_size_in_bytes();
94 return element_type_should_be_aligned(type) ? align_up(hs, BytesPerLong) : hs;
95 }
96
97 // Returns the address of the first element. The elements in the array will not
98 // relocate from this address until a subsequent thread transition.
99 void* base(BasicType type) const {
100 return reinterpret_cast<void*>(cast_from_oop<intptr_t>(as_oop()) + base_offset_in_bytes(type));
101 }
102
103 template <typename T>
104 static T* obj_offset_to_raw(arrayOop obj, size_t offset_in_bytes, T* raw) {
105 if (obj != nullptr) {
106 assert(raw == nullptr, "either raw or in-heap");
107 char* base = reinterpret_cast<char*>((void*) obj);
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