jdk8-mips64-public/hotspot: comparison src/share/vm/utilities/copy.hpp

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+:f90c822e73f8
+/*
+* Copyright (c) 2003, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*
+*/
+#ifndef SHARE_VM_UTILITIES_COPY_HPP
+#define SHARE_VM_UTILITIES_COPY_HPP
+#include "runtime/stubRoutines.hpp"
+// Assembly code for platforms that need it.
+extern "C" {
+void _Copy_conjoint_words(HeapWord* from, HeapWord* to, size_t count);
+void _Copy_disjoint_words(HeapWord* from, HeapWord* to, size_t count);
+void _Copy_conjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count);
+void _Copy_disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count);
+void _Copy_aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count);
+void _Copy_aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count);
+void _Copy_conjoint_bytes(void* from, void* to, size_t count);
+void _Copy_conjoint_bytes_atomic  (void*   from, void*   to, size_t count);
+void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count);
+void _Copy_conjoint_jints_atomic  (jint*   from, jint*   to, size_t count);
+void _Copy_conjoint_jlongs_atomic (jlong*  from, jlong*  to, size_t count);
+void _Copy_conjoint_oops_atomic   (oop*    from, oop*    to, size_t count);
+void _Copy_arrayof_conjoint_bytes  (HeapWord* from, HeapWord* to, size_t count);
+void _Copy_arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count);
+void _Copy_arrayof_conjoint_jints  (HeapWord* from, HeapWord* to, size_t count);
+void _Copy_arrayof_conjoint_jlongs (HeapWord* from, HeapWord* to, size_t count);
+void _Copy_arrayof_conjoint_oops   (HeapWord* from, HeapWord* to, size_t count);
+}
+class Copy : AllStatic {
+public:
+// Block copy methods have four attributes.  We don't define all possibilities.
+//   alignment: aligned to BytesPerLong
+//   arrayof:   arraycopy operation with both operands aligned on the same
+//              boundary as the first element of an array of the copy unit.
+//              This is currently a HeapWord boundary on all platforms, except
+//              for long and double arrays, which are aligned on an 8-byte
+//              boundary on all platforms.
+//              arraycopy operations are implicitly atomic on each array element.
+//   overlap:   disjoint or conjoint.
+//   copy unit: bytes or words (i.e., HeapWords) or oops (i.e., pointers).
+//   atomicity: atomic or non-atomic on the copy unit.
+//
+// Names are constructed thusly:
+//
+//     [ 'aligned_' | 'arrayof_' ]
+//     ('conjoint_' | 'disjoint_')
+//     ('words' | 'bytes' | 'jshorts' | 'jints' | 'jlongs' | 'oops')
+//     [ '_atomic' ]
+//
+// Except in the arrayof case, whatever the alignment is, we assume we can copy
+// whole alignment units.  E.g., if BytesPerLong is 2x word alignment, an odd
+// count may copy an extra word.  In the arrayof case, we are allowed to copy
+// only the number of copy units specified.
+//
+// All callees check count for 0.
+//
+// HeapWords
+// Word-aligned words,    conjoint, not atomic on each word
+static void conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_ok(from, to, LogHeapWordSize);
+pd_conjoint_words(from, to, count);
+}
+// Word-aligned words,    disjoint, not atomic on each word
+static void disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_ok(from, to, LogHeapWordSize);
+assert_disjoint(from, to, count);
+pd_disjoint_words(from, to, count);
+}
+// Word-aligned words,    disjoint, atomic on each word
+static void disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_ok(from, to, LogHeapWordSize);
+assert_disjoint(from, to, count);
+pd_disjoint_words_atomic(from, to, count);
+}
+// Object-aligned words,  conjoint, not atomic on each word
+static void aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_aligned(from, to);
+pd_aligned_conjoint_words(from, to, count);
+}
+// Object-aligned words,  disjoint, not atomic on each word
+static void aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_aligned(from, to);
+assert_disjoint(from, to, count);
+pd_aligned_disjoint_words(from, to, count);
+}
+// bytes, jshorts, jints, jlongs, oops
+// bytes,                 conjoint, not atomic on each byte (not that it matters)
+static void conjoint_jbytes(void* from, void* to, size_t count) {
+pd_conjoint_bytes(from, to, count);
+}
+// bytes,                 conjoint, atomic on each byte (not that it matters)
+static void conjoint_jbytes_atomic(void* from, void* to, size_t count) {
+pd_conjoint_bytes(from, to, count);
+}
+// jshorts,               conjoint, atomic on each jshort
+static void conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
+assert_params_ok(from, to, LogBytesPerShort);
+pd_conjoint_jshorts_atomic(from, to, count);
+}
+// jints,                 conjoint, atomic on each jint
+static void conjoint_jints_atomic(jint* from, jint* to, size_t count) {
+assert_params_ok(from, to, LogBytesPerInt);
+pd_conjoint_jints_atomic(from, to, count);
+}
+// jlongs,                conjoint, atomic on each jlong
+static void conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
+assert_params_ok(from, to, LogBytesPerLong);
+pd_conjoint_jlongs_atomic(from, to, count);
+}
+// oops,                  conjoint, atomic on each oop
+static void conjoint_oops_atomic(oop* from, oop* to, size_t count) {
+assert_params_ok(from, to, LogBytesPerHeapOop);
+pd_conjoint_oops_atomic(from, to, count);
+}
+// overloaded for UseCompressedOops
+static void conjoint_oops_atomic(narrowOop* from, narrowOop* to, size_t count) {
+assert(sizeof(narrowOop) == sizeof(jint), "this cast is wrong");
+assert_params_ok(from, to, LogBytesPerInt);
+pd_conjoint_jints_atomic((jint*)from, (jint*)to, count);
+}
+// Copy a span of memory.  If the span is an integral number of aligned
+// longs, words, or ints, copy those units atomically.
+// The largest atomic transfer unit is 8 bytes, or the largest power
+// of two which divides all of from, to, and size, whichever is smaller.
+static void conjoint_memory_atomic(void* from, void* to, size_t size);
+// bytes,                 conjoint array, atomic on each byte (not that it matters)
+static void arrayof_conjoint_jbytes(HeapWord* from, HeapWord* to, size_t count) {
+pd_arrayof_conjoint_bytes(from, to, count);
+}
+// jshorts,               conjoint array, atomic on each jshort
+static void arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_ok(from, to, LogBytesPerShort);
+pd_arrayof_conjoint_jshorts(from, to, count);
+}
+// jints,                 conjoint array, atomic on each jint
+static void arrayof_conjoint_jints(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_ok(from, to, LogBytesPerInt);
+pd_arrayof_conjoint_jints(from, to, count);
+}
+// jlongs,                conjoint array, atomic on each jlong
+static void arrayof_conjoint_jlongs(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_ok(from, to, LogBytesPerLong);
+pd_arrayof_conjoint_jlongs(from, to, count);
+}
+// oops,                  conjoint array, atomic on each oop
+static void arrayof_conjoint_oops(HeapWord* from, HeapWord* to, size_t count) {
+assert_params_ok(from, to, LogBytesPerHeapOop);
+pd_arrayof_conjoint_oops(from, to, count);
+}
+// Known overlap methods
+// Copy word-aligned words from higher to lower addresses, not atomic on each word
+inline static void conjoint_words_to_lower(HeapWord* from, HeapWord* to, size_t byte_count) {
+// byte_count is in bytes to check its alignment
+assert_params_ok(from, to, LogHeapWordSize);
+assert_byte_count_ok(byte_count, HeapWordSize);
+size_t count = (size_t)round_to(byte_count, HeapWordSize) >> LogHeapWordSize;
+assert(to <= from || from + count <= to, "do not overwrite source data");
+while (count-- > 0) {
+*to++ = *from++;
+}
+}
+// Copy word-aligned words from lower to higher addresses, not atomic on each word
+inline static void conjoint_words_to_higher(HeapWord* from, HeapWord* to, size_t byte_count) {
+// byte_count is in bytes to check its alignment
+assert_params_ok(from, to, LogHeapWordSize);
+assert_byte_count_ok(byte_count, HeapWordSize);
+size_t count = (size_t)round_to(byte_count, HeapWordSize) >> LogHeapWordSize;
+assert(from <= to || to + count <= from, "do not overwrite source data");
+from += count - 1;
+to   += count - 1;
+while (count-- > 0) {
+*to-- = *from--;
+}
+}
+// Fill methods
+// Fill word-aligned words, not atomic on each word
+// set_words
+static void fill_to_words(HeapWord* to, size_t count, juint value = 0) {
+assert_params_ok(to, LogHeapWordSize);
+pd_fill_to_words(to, count, value);
+}
+static void fill_to_aligned_words(HeapWord* to, size_t count, juint value = 0) {
+assert_params_aligned(to);
+pd_fill_to_aligned_words(to, count, value);
+}
+// Fill bytes
+static void fill_to_bytes(void* to, size_t count, jubyte value = 0) {
+pd_fill_to_bytes(to, count, value);
+}
+// Fill a span of memory.  If the span is an integral number of aligned
+// longs, words, or ints, store to those units atomically.
+// The largest atomic transfer unit is 8 bytes, or the largest power
+// of two which divides both to and size, whichever is smaller.
+static void fill_to_memory_atomic(void* to, size_t size, jubyte value = 0);
+// Zero-fill methods
+// Zero word-aligned words, not atomic on each word
+static void zero_to_words(HeapWord* to, size_t count) {
+assert_params_ok(to, LogHeapWordSize);
+pd_zero_to_words(to, count);
+}
+// Zero bytes
+static void zero_to_bytes(void* to, size_t count) {
+pd_zero_to_bytes(to, count);
+}
+private:
+static bool params_disjoint(HeapWord* from, HeapWord* to, size_t count) {
+if (from < to) {
+return pointer_delta(to, from) >= count;
+}
+return pointer_delta(from, to) >= count;
+}
+// These methods raise a fatal if they detect a problem.
+static void assert_disjoint(HeapWord* from, HeapWord* to, size_t count) {
+#ifdef ASSERT
+if (!params_disjoint(from, to, count))
+basic_fatal("source and dest overlap");
+#endif
+}
+static void assert_params_ok(void* from, void* to, intptr_t log_align) {
+#ifdef ASSERT
+if (mask_bits((uintptr_t)from, right_n_bits(log_align)) != 0)
+basic_fatal("not aligned");
+if (mask_bits((uintptr_t)to, right_n_bits(log_align)) != 0)
+basic_fatal("not aligned");
+#endif
+}
+static void assert_params_ok(HeapWord* to, intptr_t log_align) {
+#ifdef ASSERT
+if (mask_bits((uintptr_t)to, right_n_bits(log_align)) != 0)
+basic_fatal("not word aligned");
+#endif
+}
+static void assert_params_aligned(HeapWord* from, HeapWord* to) {
+#ifdef ASSERT
+if (mask_bits((uintptr_t)from, BytesPerLong-1) != 0)
+basic_fatal("not long aligned");
+if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0)
+basic_fatal("not long aligned");
+#endif
+}
+static void assert_params_aligned(HeapWord* to) {
+#ifdef ASSERT
+if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0)
+basic_fatal("not long aligned");
+#endif
+}
+static void assert_byte_count_ok(size_t byte_count, size_t unit_size) {
+#ifdef ASSERT
+if ((size_t)round_to(byte_count, unit_size) != byte_count) {
+basic_fatal("byte count must be aligned");
+}
+#endif
+}
+// Platform dependent implementations of the above methods.
+#ifdef TARGET_ARCH_x86
+# include "copy_x86.hpp"
+#endif
+#ifdef TARGET_ARCH_sparc
+# include "copy_sparc.hpp"
+#endif
+#ifdef TARGET_ARCH_zero
+# include "copy_zero.hpp"
+#endif
+#ifdef TARGET_ARCH_arm
+# include "copy_arm.hpp"
+#endif
+#ifdef TARGET_ARCH_ppc
+# include "copy_ppc.hpp"
+#endif
+};
+#endif // SHARE_VM_UTILITIES_COPY_HPP

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/utilities/copy.hpp

src/share/vm/utilities/copy.hpp