/*

 * Copyright (c) 2003, 2015, 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.

 *

 */

#include "precompiled.hpp"

#include "asm/macroAssembler.hpp"

#include "interpreter/interpreter.hpp"

#include "runtime/arguments.hpp"

#define __ _masm->

/**

 * Method entry for static native methods:

 *   int java.util.zip.CRC32.update(int crc, int b)

 */

  if (UseCRC32Intrinsics) {

    address entry = __ pc();

    // rbx,: Method*

    // r13: senderSP must preserved for slow path, set SP to it on fast path

    // c_rarg0: scratch (rdi on non-Win64, rcx on Win64)

    // c_rarg1: scratch (rsi on non-Win64, rdx on Win64)

    Label slow_path;

    // If we need a safepoint check, generate full interpreter entry.

    ExternalAddress state(SafepointSynchronize::address_of_state());

    __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),

             SafepointSynchronize::_not_synchronized);

    __ jcc(Assembler::notEqual, slow_path);

    // We don't generate local frame and don't align stack because

    // we call stub code and there is no safepoint on this path.

    // Load parameters

    const Register crc = rax;  // crc

    const Register val = c_rarg0;  // source java byte value

    const Register tbl = c_rarg1;  // scratch

    // Arguments are reversed on java expression stack

    __ movl(val, Address(rsp,   wordSize)); // byte value

    __ movl(crc, Address(rsp, 2*wordSize)); // Initial CRC

    __ lea(tbl, ExternalAddress(StubRoutines::crc_table_addr()));

    __ notl(crc); // ~crc

    __ update_byte_crc32(crc, val, tbl);

    __ notl(crc); // ~crc

    // result in rax

    // _areturn

    __ pop(rdi);                // get return address

    __ mov(rsp, r13);           // set sp to sender sp

    __ jmp(rdi);

    // generate a vanilla native entry as the slow path

    __ bind(slow_path);

    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));

    return entry;

  }

  return NULL;

}

/**

 * Method entry for static native methods:

 *   int java.util.zip.CRC32.updateBytes(int crc, byte[] b, int off, int len)

 *   int java.util.zip.CRC32.updateByteBuffer(int crc, long buf, int off, int len)

 */

  if (UseCRC32Intrinsics) {

    address entry = __ pc();

    // rbx,: Method*

    // r13: senderSP must preserved for slow path, set SP to it on fast path

    Label slow_path;

    // If we need a safepoint check, generate full interpreter entry.

    ExternalAddress state(SafepointSynchronize::address_of_state());

    __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),

             SafepointSynchronize::_not_synchronized);

    __ jcc(Assembler::notEqual, slow_path);

    // We don't generate local frame and don't align stack because

    // we call stub code and there is no safepoint on this path.

    // Load parameters

    const Register crc = c_rarg0;  // crc

    const Register buf = c_rarg1;  // source java byte array address

    const Register len = c_rarg2;  // length

    const Register off = len;      // offset (never overlaps with 'len')

    // Arguments are reversed on java expression stack

    // Calculate address of start element

    if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) {

      __ movptr(buf, Address(rsp, 3*wordSize)); // long buf

      __ movl2ptr(off, Address(rsp, 2*wordSize)); // offset

      __ addq(buf, off); // + offset

      __ movl(crc,   Address(rsp, 5*wordSize)); // Initial CRC

    } else {

      __ movptr(buf, Address(rsp, 3*wordSize)); // byte[] array

      __ addptr(buf, arrayOopDesc::base_offset_in_bytes(T_BYTE)); // + header size

      __ movl2ptr(off, Address(rsp, 2*wordSize)); // offset

      __ addq(buf, off); // + offset

      __ movl(crc,   Address(rsp, 4*wordSize)); // Initial CRC

    }

    // Can now load 'len' since we're finished with 'off'

    __ movl(len, Address(rsp, wordSize)); // Length

    __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, StubRoutines::updateBytesCRC32()), crc, buf, len);

    // result in rax

    // _areturn

    __ pop(rdi);                // get return address

    __ mov(rsp, r13);           // set sp to sender sp

    __ jmp(rdi);

    // generate a vanilla native entry as the slow path

    __ bind(slow_path);

    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));

    return entry;

  }

  return NULL;

}

/**

* Method entry for static native methods:

*   int java.util.zip.CRC32C.updateBytes(int crc, byte[] b, int off, int end)

*   int java.util.zip.CRC32C.updateByteBuffer(int crc, long address, int off, int end)

*/

  if (UseCRC32CIntrinsics) {

    address entry = __ pc();

    // Load parameters

    const Register crc = c_rarg0;  // crc

    const Register buf = c_rarg1;  // source java byte array address

    const Register len = c_rarg2;

    const Register off = c_rarg3;  // offset

    const Register end = len;

    // Arguments are reversed on java expression stack

    // Calculate address of start element

    if (kind == Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer) {

      __ movptr(buf, Address(rsp, 3 * wordSize)); // long buf

      __ movl2ptr(off, Address(rsp, 2 * wordSize)); // offset

      __ addq(buf, off); // + offset

      __ movl(crc, Address(rsp, 5 * wordSize)); // Initial CRC

      // Note on 5 * wordSize vs. 4 * wordSize:

      // *   int java.util.zip.CRC32C.updateByteBuffer(int crc, long address, int off, int end)

      //                                                   4         2,3          1        0

      // end starts at SP + 8

      // The Java(R) Virtual Machine Specification Java SE 7 Edition

      // 4.10.2.3. Values of Types long and double

      //    "When calculating operand stack length, values of type long and double have length two."

    } else {

      __ movptr(buf, Address(rsp, 3 * wordSize)); // byte[] array

      __ addptr(buf, arrayOopDesc::base_offset_in_bytes(T_BYTE)); // + header size

      __ movl2ptr(off, Address(rsp, 2 * wordSize)); // offset

      __ addq(buf, off); // + offset

      __ movl(crc, Address(rsp, 4 * wordSize)); // Initial CRC

    }

    __ movl(end, Address(rsp, wordSize)); // end

    __ subl(end, off); // end - off

    __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, StubRoutines::updateBytesCRC32C()), crc, buf, len);

    // result in rax

    // _areturn

    __ pop(rdi);                // get return address

    __ mov(rsp, r13);           // set sp to sender sp

    __ jmp(rdi);

    return entry;

  }

  return NULL;

}