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comparison src/share/vm/utilities/array.hpp @ 20804:7848fc12602b

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Merge with jdk8u40-b25
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Tue, 07 Apr 2015 14:58:49 +0200
parents 52b4284cb496 870c03421152
children
comparison
equal deleted inserted replaced
20184:84105dcdb05b 20804:7848fc12602b
26 #define SHARE_VM_UTILITIES_ARRAY_HPP 26 #define SHARE_VM_UTILITIES_ARRAY_HPP
27 27
28 #include "memory/allocation.hpp" 28 #include "memory/allocation.hpp"
29 #include "memory/allocation.inline.hpp" 29 #include "memory/allocation.inline.hpp"
30 #include "memory/metaspace.hpp" 30 #include "memory/metaspace.hpp"
31 #include "runtime/orderAccess.hpp"
31 32
32 // correct linkage required to compile w/o warnings 33 // correct linkage required to compile w/o warnings
33 // (must be on file level - cannot be local) 34 // (must be on file level - cannot be local)
34 extern "C" { typedef int (*ftype)(const void*, const void*); } 35 extern "C" { typedef int (*ftype)(const void*, const void*); }
35 36
302 template <typename T> 303 template <typename T>
303 class Array: public MetaspaceObj { 304 class Array: public MetaspaceObj {
304 friend class MetadataFactory; 305 friend class MetadataFactory;
305 friend class VMStructs; 306 friend class VMStructs;
306 friend class MethodHandleCompiler; // special case 307 friend class MethodHandleCompiler; // special case
308 friend class WhiteBox;
307 protected: 309 protected:
308 int _length; // the number of array elements 310 int _length; // the number of array elements
309 T _data[1]; // the array memory 311 T _data[1]; // the array memory
310 312
311 void initialize(int length) { 313 void initialize(int length) {
322 return (void*) Metaspace::allocate(loader_data, word_size, read_only, 324 return (void*) Metaspace::allocate(loader_data, word_size, read_only,
323 MetaspaceObj::array_type(sizeof(T)), CHECK_NULL); 325 MetaspaceObj::array_type(sizeof(T)), CHECK_NULL);
324 } 326 }
325 327
326 static size_t byte_sizeof(int length) { return sizeof(Array<T>) + MAX2(length - 1, 0) * sizeof(T); } 328 static size_t byte_sizeof(int length) { return sizeof(Array<T>) + MAX2(length - 1, 0) * sizeof(T); }
329
330 // WhiteBox API helper.
331 // Can't distinguish between array of length 0 and length 1,
332 // will always return 0 in those cases.
333 static int bytes_to_length(size_t bytes) {
334 assert(is_size_aligned(bytes, BytesPerWord), "Must be, for now");
335
336 if (sizeof(Array<T>) >= bytes) {
337 return 0;
338 }
339
340 size_t left = bytes - sizeof(Array<T>);
341 assert(is_size_aligned(left, sizeof(T)), "Must be");
342
343 size_t elements = left / sizeof(T);
344 assert(elements <= (size_t)INT_MAX, err_msg("number of elements " SIZE_FORMAT "doesn't fit into an int.", elements));
345
346 int length = (int)elements;
347
348 assert((size_t)size(length) * BytesPerWord == bytes,
349 err_msg("Expected: " SIZE_FORMAT " got: " SIZE_FORMAT,
350 bytes, (size_t)size(length) * BytesPerWord));
351
352 return length;
353 }
327 354
328 explicit Array(int length) : _length(length) { 355 explicit Array(int length) : _length(length) {
329 assert(length >= 0, "illegal length"); 356 assert(length >= 0, "illegal length");
330 } 357 }
331 358