Mercurial > hg > graal-compiler
view 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 |
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/* * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // arrayOopDesc is the abstract baseclass for all arrays. class arrayOopDesc : public oopDesc { friend class VMStructs; private: int _length; // number of elements in the array public: // Interpreter/Compiler offsets static int length_offset_in_bytes() { return offset_of(arrayOopDesc, _length); } static int base_offset_in_bytes(BasicType type) { return header_size(type) * HeapWordSize; } // Returns the address of the first element. void* base(BasicType type) const { return (void*) (((intptr_t) this) + base_offset_in_bytes(type)); } // Tells whether index is within bounds. bool is_within_bounds(int index) const { return 0 <= index && index < length(); } // Accessores for instance variable int length() const { return _length; } void set_length(int length) { _length = length; } // Header size computation. // Should only be called with constants as argument (will not constant fold otherwise) static int header_size(BasicType type) { return Universe::element_type_should_be_aligned(type) ? align_object_size(sizeof(arrayOopDesc)/HeapWordSize) : sizeof(arrayOopDesc)/HeapWordSize; } // This method returns the maximum length that can passed into // typeArrayOop::object_size(scale, length, header_size) without causing an // overflow. We substract an extra 2*wordSize to guard against double word // alignments. It gets the scale from the type2aelembytes array. static int32_t max_array_length(BasicType type) { assert(type >= 0 && type < T_CONFLICT, "wrong type"); assert(type2aelembytes(type) != 0, "wrong type"); // We use max_jint, since object_size is internally represented by an 'int' // This gives us an upper bound of max_jint words for the size of the oop. int32_t max_words = (max_jint - header_size(type) - 2); int elembytes = (type == T_OBJECT) ? T_OBJECT_aelem_bytes : type2aelembytes(type); jlong len = ((jlong)max_words * HeapWordSize) / elembytes; return (len > max_jint) ? max_jint : (int32_t)len; } };