/*

 * Copyright (c) 2003, 2016, 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/interp_masm.hpp"

#include "interpreter/interpreter.hpp"

#include "interpreter/interpreterRuntime.hpp"

#include "interpreter/templateInterpreterGenerator.hpp"

#include "runtime/arguments.hpp"

#define __ _masm->

#ifdef _WIN64

address TemplateInterpreterGenerator::generate_slow_signature_handler() {

  address entry = __ pc();

  // rbx: method

  // r14: pointer to locals

  // c_rarg3: first stack arg - wordSize

  __ mov(c_rarg3, rsp);

  // adjust rsp

  __ subptr(rsp, 4 * wordSize);

  __ call_VM(noreg,

             CAST_FROM_FN_PTR(address,

                              InterpreterRuntime::slow_signature_handler),

             rbx, r14, c_rarg3);

  // rax: result handler

  // Stack layout:

  // rsp: 3 integer or float args (if static first is unused)

  //      1 float/double identifiers

  //        return address

  //        stack args

  //        garbage

  //        expression stack bottom

  //        bcp (NULL)

  //        ...

  // Do FP first so we can use c_rarg3 as temp

  __ movl(c_rarg3, Address(rsp, 3 * wordSize)); // float/double identifiers

  for ( int i= 0; i < Argument::n_int_register_parameters_c-1; i++ ) {

    XMMRegister floatreg = as_XMMRegister(i+1);

    Label isfloatordouble, isdouble, next;

    __ testl(c_rarg3, 1 << (i*2));      // Float or Double?

    __ jcc(Assembler::notZero, isfloatordouble);

    // Do Int register here

    switch ( i ) {

      case 0:

        __ movl(rscratch1, Address(rbx, Method::access_flags_offset()));

        __ testl(rscratch1, JVM_ACC_STATIC);

        __ cmovptr(Assembler::zero, c_rarg1, Address(rsp, 0));

        break;

      case 1:

        __ movptr(c_rarg2, Address(rsp, wordSize));

        break;

      case 2:

        __ movptr(c_rarg3, Address(rsp, 2 * wordSize));

        break;

      default:

        break;

    }

    __ jmp (next);

    __ bind(isfloatordouble);

    __ testl(c_rarg3, 1 << ((i*2)+1));     // Double?

    __ jcc(Assembler::notZero, isdouble);

// Do Float Here

    __ movflt(floatreg, Address(rsp, i * wordSize));

    __ jmp(next);

// Do Double here

    __ bind(isdouble);

    __ movdbl(floatreg, Address(rsp, i * wordSize));

    __ bind(next);

  }

  // restore rsp

  __ addptr(rsp, 4 * wordSize);

  __ ret(0);

  return entry;

}

#else

address TemplateInterpreterGenerator::generate_slow_signature_handler() {

  address entry = __ pc();

  // rbx: method

  // r14: pointer to locals

  // c_rarg3: first stack arg - wordSize

  __ mov(c_rarg3, rsp);

  // adjust rsp

  __ subptr(rsp, 14 * wordSize);

  __ call_VM(noreg,

             CAST_FROM_FN_PTR(address,

                              InterpreterRuntime::slow_signature_handler),

             rbx, r14, c_rarg3);

  // rax: result handler

  // Stack layout:

  // rsp: 5 integer args (if static first is unused)

  //      1 float/double identifiers

  //      8 double args

  //        return address

  //        stack args

  //        garbage

  //        expression stack bottom

  //        bcp (NULL)

  //        ...

  // Do FP first so we can use c_rarg3 as temp

  __ movl(c_rarg3, Address(rsp, 5 * wordSize)); // float/double identifiers

  for (int i = 0; i < Argument::n_float_register_parameters_c; i++) {

    const XMMRegister r = as_XMMRegister(i);

    Label d, done;

    __ testl(c_rarg3, 1 << i);

    __ jcc(Assembler::notZero, d);

    __ movflt(r, Address(rsp, (6 + i) * wordSize));

    __ jmp(done);

    __ bind(d);

    __ movdbl(r, Address(rsp, (6 + i) * wordSize));

    __ bind(done);

  }

  // Now handle integrals.  Only do c_rarg1 if not static.

  __ movl(c_rarg3, Address(rbx, Method::access_flags_offset()));

  __ testl(c_rarg3, JVM_ACC_STATIC);

  __ cmovptr(Assembler::zero, c_rarg1, Address(rsp, 0));

  __ movptr(c_rarg2, Address(rsp, wordSize));

  __ movptr(c_rarg3, Address(rsp, 2 * wordSize));

  __ movptr(c_rarg4, Address(rsp, 3 * wordSize));

  __ movptr(c_rarg5, Address(rsp, 4 * wordSize));

  // restore rsp

  __ addptr(rsp, 14 * wordSize);

  __ ret(0);

  return entry;

}

#endif  // __WIN64

/**

 * Method entry for static native methods:

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

 */

address TemplateInterpreterGenerator::generate_CRC32_update_entry() {

  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)

 */

address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {

  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)

*/

address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {

  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;

}

//

// Various method entries

//

address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {

  // rbx,: Method*

  // rcx: scratrch

  // r13: sender sp

  if (!InlineIntrinsics) return NULL; // Generate a vanilla entry

  address entry_point = __ pc();

  // These don't need a safepoint check because they aren't virtually

  // callable. We won't enter these intrinsics from compiled code.

  // If in the future we added an intrinsic which was virtually callable

  // we'd have to worry about how to safepoint so that this code is used.

  // mathematical functions inlined by compiler

  // (interpreter must provide identical implementation

  // in order to avoid monotonicity bugs when switching

  // from interpreter to compiler in the middle of some

  // computation)

  //

  // stack: [ ret adr ] <-- rsp

  //        [ lo(arg) ]

  //        [ hi(arg) ]

  //

  if (kind == Interpreter::java_lang_math_sqrt) {

    __ sqrtsd(xmm0, Address(rsp, wordSize));

  } else if (kind == Interpreter::java_lang_math_exp) {

    __ movdbl(xmm0, Address(rsp, wordSize));

  } else if (kind == Interpreter::java_lang_math_log) {

    __ movdbl(xmm0, Address(rsp, wordSize));

  } else if (kind == Interpreter::java_lang_math_pow) {

    __ movdbl(xmm1, Address(rsp, wordSize));

    __ movdbl(xmm0, Address(rsp, 3 * wordSize));

  } else {

    __ fld_d(Address(rsp, wordSize));

    switch (kind) {

      case Interpreter::java_lang_math_abs:

          __ fabs();

          break;

      default                              :

          ShouldNotReachHere();

    }

    // return double result in xmm0 for interpreter and compilers.

    __ subptr(rsp, 2*wordSize);

    // Round to 64bit precision

    __ fstp_d(Address(rsp, 0));

    __ movdbl(xmm0, Address(rsp, 0));

    __ addptr(rsp, 2*wordSize);

  }

  __ pop(rax);

  __ mov(rsp, r13);

  __ jmp(rax);

  return entry_point;

}