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src/share/vm/memory/padded.inline.hpp@7ae4e26cb1e0 (annotated)

src/share/vm/memory/padded.inline.hpp

Thu, 12 Oct 2017 21:27:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 21:27:07 +0800

changeset 7535

7ae4e26cb1e0

parent 6876

710a3c8b516e

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "memory/allocation.inline.hpp"
aoqi@0	26	#include "memory/padded.hpp"
aoqi@0	27	#include "utilities/debug.hpp"
aoqi@0	28	#include "utilities/globalDefinitions.hpp"
aoqi@0	29
aoqi@0	30	// Creates an aligned padded array.
aoqi@0	31	// The memory can't be deleted since the raw memory chunk is not returned.
aoqi@0	32	template <class T, MEMFLAGS flags, size_t alignment>
aoqi@0	33	PaddedEnd<T>* PaddedArray<T, flags, alignment>::create_unfreeable(uint length) {
aoqi@0	34	// Check that the PaddedEnd class works as intended.
aoqi@0	35	STATIC_ASSERT(is_size_aligned_(sizeof(PaddedEnd<T>), alignment));
aoqi@0	36
aoqi@0	37	// Allocate a chunk of memory large enough to allow for some alignment.
aoqi@0	38	void* chunk = AllocateHeap(length * sizeof(PaddedEnd<T, alignment>) + alignment, flags);
aoqi@0	39
aoqi@0	40	// Make the initial alignment.
aoqi@0	41	PaddedEnd<T>* aligned_padded_array = (PaddedEnd<T>*)align_pointer_up(chunk, alignment);
aoqi@0	42
aoqi@0	43	// Call the default constructor for each element.
aoqi@0	44	for (uint i = 0; i < length; i++) {
aoqi@0	45	::new (&aligned_padded_array[i]) T();
aoqi@0	46	}
aoqi@0	47
aoqi@0	48	return aligned_padded_array;
aoqi@0	49	}
aoqi@0	50
aoqi@0	51	template <class T, MEMFLAGS flags, size_t alignment>
aoqi@0	52	T** Padded2DArray<T, flags, alignment>::create_unfreeable(uint rows, uint columns, size_t* allocation_size) {
aoqi@0	53	// Calculate and align the size of the first dimension's table.
aoqi@0	54	size_t table_size = align_size_up_(rows * sizeof(T*), alignment);
aoqi@0	55	// The size of the separate rows.
aoqi@0	56	size_t row_size = align_size_up_(columns * sizeof(T), alignment);
aoqi@0	57	// Total size consists of the indirection table plus the rows.
aoqi@0	58	size_t total_size = table_size + rows * row_size + alignment;
aoqi@0	59
aoqi@0	60	// Allocate a chunk of memory large enough to allow alignment of the chunk.
aoqi@0	61	void* chunk = AllocateHeap(total_size, flags);
aoqi@0	62	// Clear the allocated memory.
aoqi@0	63	memset(chunk, 0, total_size);
aoqi@0	64	// Align the chunk of memory.
aoqi@0	65	T** result = (T**)align_pointer_up(chunk, alignment);
aoqi@0	66	void* data_start = (void*)((uintptr_t)result + table_size);
aoqi@0	67
aoqi@0	68	// Fill in the row table.
aoqi@0	69	for (size_t i = 0; i < rows; i++) {
aoqi@0	70	result[i] = (T*)((uintptr_t)data_start + i * row_size);
aoqi@0	71	}
aoqi@0	72
aoqi@0	73	if (allocation_size != NULL) {
aoqi@0	74	*allocation_size = total_size;
aoqi@0	75	}
aoqi@0	76
aoqi@0	77	return result;
aoqi@0	78	}
aoqi@0	79
aoqi@0	80	template <class T, MEMFLAGS flags, size_t alignment>
aoqi@0	81	T* PaddedPrimitiveArray<T, flags, alignment>::create_unfreeable(size_t length) {
aoqi@0	82	// Allocate a chunk of memory large enough to allow for some alignment.
aoqi@0	83	void* chunk = AllocateHeap(length * sizeof(T) + alignment, flags);
aoqi@0	84
aoqi@0	85	memset(chunk, 0, length * sizeof(T) + alignment);
aoqi@0	86
aoqi@0	87	return (T*)align_pointer_up(chunk, alignment);
aoqi@0	88	}