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 /*

  * Copyright (c) 2003, 2008, 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.

  *

  */

 // 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.

   #include "incls/_copy_pd.hpp.incl"

 };