Mercurial > hg > truffle

comparison src/share/vm/oops/arrayOop.hpp @ 481:7d7a7c599c17

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
6578152: fill_region_with_object has usability and safety issues Reviewed-by: apetrusenko, ysr
author jcoomes
date Thu, 11 Dec 2008 12:05:08 -0800
parents d1605aabd0a1
children 0fbdb4381b99
comparison
equal deleted inserted replaced
480:d249b360e026 481:7d7a7c599c17
94 return (int)(Universe::element_type_should_be_aligned(type) 94 return (int)(Universe::element_type_should_be_aligned(type)
95 ? align_object_size(typesize_in_bytes/HeapWordSize) 95 ? align_object_size(typesize_in_bytes/HeapWordSize)
96 : typesize_in_bytes/HeapWordSize); 96 : typesize_in_bytes/HeapWordSize);
97 } 97 }
98 98
99 // This method returns the maximum length that can passed into 99 // Return the maximum length of an array of BasicType. The length can passed
100 // typeArrayOop::object_size(scale, length, header_size) without causing an 100 // to typeArrayOop::object_size(scale, length, header_size) without causing an
101 // overflow. We substract an extra 2*wordSize to guard against double word 101 // overflow.
102 // alignments. It gets the scale from the type2aelembytes array.
103 static int32_t max_array_length(BasicType type) { 102 static int32_t max_array_length(BasicType type) {
104 assert(type >= 0 && type < T_CONFLICT, "wrong type"); 103 assert(type >= 0 && type < T_CONFLICT, "wrong type");
105 assert(type2aelembytes(type) != 0, "wrong type"); 104 assert(type2aelembytes(type) != 0, "wrong type");
106 // We use max_jint, since object_size is internally represented by an 'int' 105 const int bytes_per_element = type2aelembytes(type);
107 // This gives us an upper bound of max_jint words for the size of the oop. 106 if (bytes_per_element < HeapWordSize) {
108 int32_t max_words = (max_jint - header_size(type) - 2); 107 return max_jint;
109 int elembytes = type2aelembytes(type); 108 }
110 jlong len = ((jlong)max_words * HeapWordSize) / elembytes; 109
111 return (len > max_jint) ? max_jint : (int32_t)len; 110 const int32_t max_words = align_size_down(max_jint, MinObjAlignment);
111 const int32_t max_element_words = max_words - header_size(type);
112 const int32_t words_per_element = bytes_per_element >> LogHeapWordSize;
113 return max_element_words / words_per_element;
112 } 114 }
113
114 }; 115 };