54 // Initialize the members of this class. The biased start address of this array |
54 // Initialize the members of this class. The biased start address of this array |
55 // is the bias (in elements) multiplied by the element size. |
55 // is the bias (in elements) multiplied by the element size. |
56 void initialize_base(address base, size_t length, size_t bias, size_t elem_size, uint shift_by) { |
56 void initialize_base(address base, size_t length, size_t bias, size_t elem_size, uint shift_by) { |
57 assert(base != NULL, "just checking"); |
57 assert(base != NULL, "just checking"); |
58 assert(length > 0, "just checking"); |
58 assert(length > 0, "just checking"); |
59 assert(shift_by < sizeof(uintptr_t) * 8, err_msg("Shifting by %u, larger than word size?", shift_by)); |
59 assert(shift_by < sizeof(uintptr_t) * 8, "Shifting by %u, larger than word size?", shift_by); |
60 _base = base; |
60 _base = base; |
61 _length = length; |
61 _length = length; |
62 _biased_base = base - (bias * elem_size); |
62 _biased_base = base - (bias * elem_size); |
63 _bias = bias; |
63 _bias = bias; |
64 _shift_by = shift_by; |
64 _shift_by = shift_by; |
67 // Allocate and initialize this array to cover the heap addresses in the range |
67 // Allocate and initialize this array to cover the heap addresses in the range |
68 // of [bottom, end). |
68 // of [bottom, end). |
69 void initialize(HeapWord* bottom, HeapWord* end, size_t target_elem_size_in_bytes, size_t mapping_granularity_in_bytes) { |
69 void initialize(HeapWord* bottom, HeapWord* end, size_t target_elem_size_in_bytes, size_t mapping_granularity_in_bytes) { |
70 assert(mapping_granularity_in_bytes > 0, "just checking"); |
70 assert(mapping_granularity_in_bytes > 0, "just checking"); |
71 assert(is_power_of_2(mapping_granularity_in_bytes), |
71 assert(is_power_of_2(mapping_granularity_in_bytes), |
72 err_msg("mapping granularity must be power of 2, is %zd", mapping_granularity_in_bytes)); |
72 "mapping granularity must be power of 2, is %zd", mapping_granularity_in_bytes); |
73 assert((uintptr_t)bottom % mapping_granularity_in_bytes == 0, |
73 assert((uintptr_t)bottom % mapping_granularity_in_bytes == 0, |
74 err_msg("bottom mapping area address must be a multiple of mapping granularity %zd, is " PTR_FORMAT, |
74 "bottom mapping area address must be a multiple of mapping granularity %zd, is " PTR_FORMAT, |
75 mapping_granularity_in_bytes, p2i(bottom))); |
75 mapping_granularity_in_bytes, p2i(bottom)); |
76 assert((uintptr_t)end % mapping_granularity_in_bytes == 0, |
76 assert((uintptr_t)end % mapping_granularity_in_bytes == 0, |
77 err_msg("end mapping area address must be a multiple of mapping granularity %zd, is " PTR_FORMAT, |
77 "end mapping area address must be a multiple of mapping granularity %zd, is " PTR_FORMAT, |
78 mapping_granularity_in_bytes, p2i(end))); |
78 mapping_granularity_in_bytes, p2i(end)); |
79 size_t num_target_elems = pointer_delta(end, bottom, mapping_granularity_in_bytes); |
79 size_t num_target_elems = pointer_delta(end, bottom, mapping_granularity_in_bytes); |
80 idx_t bias = (uintptr_t)bottom / mapping_granularity_in_bytes; |
80 idx_t bias = (uintptr_t)bottom / mapping_granularity_in_bytes; |
81 address base = create_new_base_array(num_target_elems, target_elem_size_in_bytes); |
81 address base = create_new_base_array(num_target_elems, target_elem_size_in_bytes); |
82 initialize_base(base, num_target_elems, bias, target_elem_size_in_bytes, log2_intptr(mapping_granularity_in_bytes)); |
82 initialize_base(base, num_target_elems, bias, target_elem_size_in_bytes, log2_intptr(mapping_granularity_in_bytes)); |
83 } |
83 } |