/*

 * Copyright (c) 2004, 2017, 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.inline.hpp"

#include "memory/resourceArea.hpp"

#include "prims/jniFastGetField.hpp"

#include "prims/jvm_misc.hpp"

#include "runtime/safepoint.hpp"

// TSO ensures that loads are blocking and ordered with respect to

// to earlier loads, so we don't need LoadLoad membars.

#define __ masm->

#define BUFFER_SIZE 30*sizeof(jint)

// Common register usage:

// O0: env

// O1: obj

// O2: jfieldID

// O4: offset (O2 >> 2)

// G4: old safepoint counter

address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {

  const char *name;

  switch (type) {

    case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;

    case T_BYTE:    name = "jni_fast_GetByteField";    break;

    case T_CHAR:    name = "jni_fast_GetCharField";    break;

    case T_SHORT:   name = "jni_fast_GetShortField";   break;

    case T_INT:     name = "jni_fast_GetIntField";     break;

    default:        ShouldNotReachHere();

  }

  ResourceMark rm;

  BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);

  CodeBuffer cbuf(blob);

  MacroAssembler* masm = new MacroAssembler(&cbuf);

  address fast_entry = __ pc();

  Label label1, label2;

  AddressLiteral cnt_addrlit(SafepointSynchronize::safepoint_counter_addr());

  __ sethi (cnt_addrlit, O3);

  Address cnt_addr(O3, cnt_addrlit.low10());

  __ ld (cnt_addr, G4);

  __ andcc (G4, 1, G0);

  __ br (Assembler::notZero, false, Assembler::pn, label1);

  __ delayed()->srl (O2, 2, O4);

  __ andn (O1, JNIHandles::weak_tag_mask, O1);

  __ ld_ptr (O1, 0, O5);

  assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");

  speculative_load_pclist[count] = __ pc();

  switch (type) {

    case T_BOOLEAN: __ ldub (O5, O4, G3);  break;

    case T_BYTE:    __ ldsb (O5, O4, G3);  break;

    case T_CHAR:    __ lduh (O5, O4, G3);  break;

    case T_SHORT:   __ ldsh (O5, O4, G3);  break;

    case T_INT:     __ ld (O5, O4, G3);    break;

    default:        ShouldNotReachHere();

  }

  __ ld (cnt_addr, O5);

  __ cmp (O5, G4);

  __ br (Assembler::notEqual, false, Assembler::pn, label2);

  __ delayed()->mov (O7, G1);

  __ retl ();

  __ delayed()->mov (G3, O0);

  slowcase_entry_pclist[count++] = __ pc();

  __ bind (label1);

  __ mov (O7, G1);

  address slow_case_addr;

  switch (type) {

    case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;

    case T_BYTE:    slow_case_addr = jni_GetByteField_addr();    break;

    case T_CHAR:    slow_case_addr = jni_GetCharField_addr();    break;

    case T_SHORT:   slow_case_addr = jni_GetShortField_addr();   break;

    case T_INT:     slow_case_addr = jni_GetIntField_addr();     break;

    default:        ShouldNotReachHere();

  }

  __ bind (label2);

  __ call (slow_case_addr, relocInfo::none);

  __ delayed()->mov (G1, O7);

  __ flush ();

  return fast_entry;

}

address JNI_FastGetField::generate_fast_get_boolean_field() {

  return generate_fast_get_int_field0(T_BOOLEAN);

}

address JNI_FastGetField::generate_fast_get_byte_field() {

  return generate_fast_get_int_field0(T_BYTE);

}

address JNI_FastGetField::generate_fast_get_char_field() {

  return generate_fast_get_int_field0(T_CHAR);

}

address JNI_FastGetField::generate_fast_get_short_field() {

  return generate_fast_get_int_field0(T_SHORT);

}

address JNI_FastGetField::generate_fast_get_int_field() {

  return generate_fast_get_int_field0(T_INT);

}

address JNI_FastGetField::generate_fast_get_long_field() {

  const char *name = "jni_fast_GetLongField";

  ResourceMark rm;

  BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);

  CodeBuffer cbuf(blob);

  MacroAssembler* masm = new MacroAssembler(&cbuf);

  address fast_entry = __ pc();

  Label label1, label2;

  AddressLiteral cnt_addrlit(SafepointSynchronize::safepoint_counter_addr());

  __ sethi (cnt_addrlit, G3);

  Address cnt_addr(G3, cnt_addrlit.low10());

  __ ld (cnt_addr, G4);

  __ andcc (G4, 1, G0);

  __ br (Assembler::notZero, false, Assembler::pn, label1);

  __ delayed()->srl (O2, 2, O4);

  __ andn (O1, JNIHandles::weak_tag_mask, O1);

  __ ld_ptr (O1, 0, O5);

  __ add (O5, O4, O5);

  assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");

  speculative_load_pclist[count] = __ pc();

  __ ldx (O5, 0, O3);

  __ ld (cnt_addr, G1);

  __ cmp (G1, G4);

  __ br (Assembler::notEqual, false, Assembler::pn, label2);

  __ delayed()->mov (O7, G1);

  __ retl ();

  __ delayed()->mov (O3, O0);

  slowcase_entry_pclist[count++] = __ pc();

  __ bind (label1);

  __ mov (O7, G1);

  address slow_case_addr = jni_GetLongField_addr();

  __ bind (label2);

  __ call (slow_case_addr, relocInfo::none);

  __ delayed()->mov (G1, O7);

  __ flush ();

  return fast_entry;

}

address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {

  const char *name;

  switch (type) {

    case T_FLOAT:  name = "jni_fast_GetFloatField";  break;

    case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;

    default:       ShouldNotReachHere();

  }

  ResourceMark rm;

  BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);

  CodeBuffer cbuf(blob);

  MacroAssembler* masm = new MacroAssembler(&cbuf);

  address fast_entry = __ pc();

  Label label1, label2;

  AddressLiteral cnt_addrlit(SafepointSynchronize::safepoint_counter_addr());

  __ sethi (cnt_addrlit, O3);

  Address cnt_addr(O3, cnt_addrlit.low10());

  __ ld (cnt_addr, G4);

  __ andcc (G4, 1, G0);

  __ br (Assembler::notZero, false, Assembler::pn, label1);

  __ delayed()->srl (O2, 2, O4);

  __ andn (O1, JNIHandles::weak_tag_mask, O1);

  __ ld_ptr (O1, 0, O5);

  assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");

  speculative_load_pclist[count] = __ pc();

  switch (type) {

    case T_FLOAT:  __ ldf (FloatRegisterImpl::S, O5, O4, F0); break;

    case T_DOUBLE: __ ldf (FloatRegisterImpl::D, O5, O4, F0); break;

    default:       ShouldNotReachHere();

  }

  __ ld (cnt_addr, O5);

  __ cmp (O5, G4);

  __ br (Assembler::notEqual, false, Assembler::pn, label2);

  __ delayed()->mov (O7, G1);

  __ retl ();

  __ delayed()-> nop ();

  slowcase_entry_pclist[count++] = __ pc();

  __ bind (label1);

  __ mov (O7, G1);

  address slow_case_addr;

  switch (type) {

    case T_FLOAT:  slow_case_addr = jni_GetFloatField_addr();  break;

    case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;

    default:       ShouldNotReachHere();

  }

  __ bind (label2);

  __ call (slow_case_addr, relocInfo::none);

  __ delayed()->mov (G1, O7);

  __ flush ();

  return fast_entry;

}

address JNI_FastGetField::generate_fast_get_float_field() {

  return generate_fast_get_float_field0(T_FLOAT);

}

address JNI_FastGetField::generate_fast_get_double_field() {

  return generate_fast_get_float_field0(T_DOUBLE);

}