Mercurial > hg > truffle
annotate src/share/vm/oops/arrayOop.hpp @ 29:d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
Summary: T_ADDRESS size is defined as 'int' size (4 bytes) but C2 use it for raw pointers and as memory type for StoreP and LoadP nodes.
Reviewed-by: jrose
| author | kvn |
|---|---|
| date | Mon, 25 Feb 2008 15:05:44 -0800 |
| parents | a61af66fc99e |
| children | ba764ed4b6f2 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // arrayOopDesc is the abstract baseclass for all arrays. | |
| 26 | |
| 27 class arrayOopDesc : public oopDesc { | |
| 28 friend class VMStructs; | |
| 29 private: | |
| 30 int _length; // number of elements in the array | |
| 31 | |
| 32 public: | |
| 33 // Interpreter/Compiler offsets | |
| 34 static int length_offset_in_bytes() { return offset_of(arrayOopDesc, _length); } | |
| 35 static int base_offset_in_bytes(BasicType type) { return header_size(type) * HeapWordSize; } | |
| 36 | |
| 37 // Returns the address of the first element. | |
| 38 void* base(BasicType type) const { return (void*) (((intptr_t) this) + base_offset_in_bytes(type)); } | |
| 39 | |
| 40 // Tells whether index is within bounds. | |
| 41 bool is_within_bounds(int index) const { return 0 <= index && index < length(); } | |
| 42 | |
| 43 // Accessores for instance variable | |
| 44 int length() const { return _length; } | |
| 45 void set_length(int length) { _length = length; } | |
| 46 | |
| 47 // Header size computation. | |
| 48 // Should only be called with constants as argument (will not constant fold otherwise) | |
| 49 static int header_size(BasicType type) { | |
| 50 return Universe::element_type_should_be_aligned(type) | |
| 51 ? align_object_size(sizeof(arrayOopDesc)/HeapWordSize) | |
| 52 : sizeof(arrayOopDesc)/HeapWordSize; | |
| 53 } | |
| 54 | |
| 55 // This method returns the maximum length that can passed into | |
| 56 // typeArrayOop::object_size(scale, length, header_size) without causing an | |
| 57 // overflow. We substract an extra 2*wordSize to guard against double word | |
| 58 // alignments. It gets the scale from the type2aelembytes array. | |
| 59 static int32_t max_array_length(BasicType type) { | |
| 60 assert(type >= 0 && type < T_CONFLICT, "wrong type"); | |
|
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
kvn
parents:
0
diff
changeset
|
61 assert(type2aelembytes(type) != 0, "wrong type"); |
| 0 | 62 // We use max_jint, since object_size is internally represented by an 'int' |
| 63 // This gives us an upper bound of max_jint words for the size of the oop. | |
| 64 int32_t max_words = (max_jint - header_size(type) - 2); | |
|
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
kvn
parents:
0
diff
changeset
|
65 int elembytes = (type == T_OBJECT) ? T_OBJECT_aelem_bytes : type2aelembytes(type); |
| 0 | 66 jlong len = ((jlong)max_words * HeapWordSize) / elembytes; |
| 67 return (len > max_jint) ? max_jint : (int32_t)len; | |
| 68 } | |
| 69 | |
| 70 }; |