1.1 --- a/src/share/vm/utilities/array.hpp Tue Jul 01 09:03:55 2014 +0200
1.2 +++ b/src/share/vm/utilities/array.hpp Mon Jul 07 10:12:40 2014 +0200
1.3 @@ -305,6 +305,7 @@
1.4 friend class MetadataFactory;
1.5 friend class VMStructs;
1.6 friend class MethodHandleCompiler; // special case
1.7 + friend class WhiteBox;
1.8 protected:
1.9 int _length; // the number of array elements
1.10 T _data[1]; // the array memory
1.11 @@ -326,6 +327,29 @@
1.12
1.13 static size_t byte_sizeof(int length) { return sizeof(Array<T>) + MAX2(length - 1, 0) * sizeof(T); }
1.14
1.15 + // WhiteBox API helper.
1.16 + static int bytes_to_length(size_t bytes) {
1.17 + assert(is_size_aligned(bytes, BytesPerWord), "Must be, for now");
1.18 +
1.19 + if (sizeof(Array<T>) >= bytes) {
1.20 + return 0;
1.21 + }
1.22 +
1.23 + size_t left = bytes - sizeof(Array<T>);
1.24 + assert(is_size_aligned(left, sizeof(T)), "Must be");
1.25 +
1.26 + size_t elements = left / sizeof(T);
1.27 + assert(elements <= (size_t)INT_MAX, err_msg("number of elements " SIZE_FORMAT "doesn't fit into an int.", elements));
1.28 +
1.29 + int length = (int)elements;
1.30 +
1.31 + assert((size_t)size(length) * BytesPerWord == bytes,
1.32 + err_msg("Expected: " SIZE_FORMAT " got: " SIZE_FORMAT,
1.33 + bytes, (size_t)size(length) * BytesPerWord));
1.34 +
1.35 + return length;
1.36 + }
1.37 +
1.38 explicit Array(int length) : _length(length) {
1.39 assert(length >= 0, "illegal length");
1.40 }
