Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/oops/arrayOop.hpp
src/share/vm/oops/arrayOop.hpp
- changeset 3271
- aa4c21b00f7f
- parent 3266
- 6fd81579526f
- child 3335
- 3c648b9ad052
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| 3270:ab5107bee78c | 3271:aa4c21b00f7f |
|---|---|
| 108 // 32 bit platforms when we convert it to a byte size. | 108 // 32 bit platforms when we convert it to a byte size. |
| 109 static int32_t max_array_length(BasicType type) { | 109 static int32_t max_array_length(BasicType type) { |
| 110 assert(type >= 0 && type < T_CONFLICT, "wrong type"); | 110 assert(type >= 0 && type < T_CONFLICT, "wrong type"); |
| 111 assert(type2aelembytes(type) != 0, "wrong type"); | 111 assert(type2aelembytes(type) != 0, "wrong type"); |
| 112 | 112 |
| 113 const size_t max_element_words_per_size_t = align_size_down((SIZE_MAX/HeapWordSize - header_size(type)), MinObjAlignment); | 113 const size_t max_element_words_per_size_t = |
| 114 const size_t max_elements_per_size_t = HeapWordSize * max_element_words_per_size_t / type2aelembytes(type); | 114 align_size_down((SIZE_MAX/HeapWordSize - header_size(type)), MinObjAlignment); |
| 115 const size_t max_elements_per_size_t = | |
| 116 HeapWordSize * max_element_words_per_size_t / type2aelembytes(type); | |
| 115 if ((size_t)max_jint < max_elements_per_size_t) { | 117 if ((size_t)max_jint < max_elements_per_size_t) { |
| 116 return max_jint; | 118 // It should be ok to return max_jint here, but parts of the code |
| 119 // (CollectedHeap, Klass::oop_oop_iterate(), and more) uses an int for | |
| 120 // passing around the size (in words) of an object. So, we need to avoid | |
| 121 // overflowing an int when we add the header. See CRs 4718400 and 7110613. | |
| 122 return align_size_down(max_jint - header_size(type), MinObjAlignment); | |
| 117 } | 123 } |
| 118 return (int32_t)max_elements_per_size_t; | 124 return (int32_t)max_elements_per_size_t; |
| 119 } | 125 } |
| 120 | 126 |
| 121 // for unit testing | 127 // for unit testing |
