/*

 * 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.hpp"

#include "memory/resourceArea.hpp"

#include "prims/jniFastGetField.hpp"

#include "prims/jvm_misc.hpp"

#include "runtime/safepoint.hpp"

#define __ masm->

#define BUFFER_SIZE 30

#ifdef _WINDOWS

GetBooleanField_t JNI_FastGetField::jni_fast_GetBooleanField_fp;

GetByteField_t    JNI_FastGetField::jni_fast_GetByteField_fp;

GetCharField_t    JNI_FastGetField::jni_fast_GetCharField_fp;

GetShortField_t   JNI_FastGetField::jni_fast_GetShortField_fp;

GetIntField_t     JNI_FastGetField::jni_fast_GetIntField_fp;

GetLongField_t    JNI_FastGetField::jni_fast_GetLongField_fp;

GetFloatField_t   JNI_FastGetField::jni_fast_GetFloatField_fp;

GetDoubleField_t  JNI_FastGetField::jni_fast_GetDoubleField_fp;

#endif

// Instead of issuing lfence for LoadLoad barrier, we create data dependency

// between loads, which is much more efficient than lfence.

address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {

  const char *name = NULL;

  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 slow;

  // stack layout:    offset from rsp (in words):

  //  return pc        0

  //  jni env          1

  //  obj              2

  //  jfieldID         3

  ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());

  __ mov32 (rcx, counter);

  __ testb (rcx, 1);

  __ jcc (Assembler::notZero, slow);

  if (os::is_MP()) {

    __ mov(rax, rcx);

    __ andptr(rax, 1);                         // rax, must end up 0

    __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));

                                              // obj, notice rax, is 0.

                                              // rdx is data dependent on rcx.

  } else {

    __ movptr (rdx, Address(rsp, 2*wordSize));  // obj

  }

  __ movptr(rax, Address(rsp, 3*wordSize));  // jfieldID

  __ clear_jweak_tag(rdx);

  __ movptr(rdx, Address(rdx, 0));           // *obj

  __ shrptr (rax, 2);                         // offset

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

  speculative_load_pclist[count] = __ pc();

  switch (type) {

    case T_BOOLEAN: __ movzbl (rax, Address(rdx, rax, Address::times_1)); break;

    case T_BYTE:    __ movsbl (rax, Address(rdx, rax, Address::times_1)); break;

    case T_CHAR:    __ movzwl (rax, Address(rdx, rax, Address::times_1)); break;

    case T_SHORT:   __ movswl (rax, Address(rdx, rax, Address::times_1)); break;

    case T_INT:     __ movl   (rax, Address(rdx, rax, Address::times_1)); break;

    default:        ShouldNotReachHere();

  }

  Address ca1;

  if (os::is_MP()) {

    __ lea(rdx, counter);

    __ xorptr(rdx, rax);

    __ xorptr(rdx, rax);

    __ cmp32(rcx, Address(rdx, 0));

    // ca1 is the same as ca because

    // rax, ^ counter_addr ^ rax, = address

    // ca1 is data dependent on rax,.

  } else {

    __ cmp32(rcx, counter);

  }

  __ jcc (Assembler::notEqual, slow);

#ifndef _WINDOWS

  __ ret (0);

#else

  // __stdcall calling convention

  __ ret (3*wordSize);

#endif

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

  __ bind (slow);

  address slow_case_addr = NULL;

  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();

  }

  // tail call

  __ jump (ExternalAddress(slow_case_addr));

  __ flush ();

#ifndef _WINDOWS

  return fast_entry;

#else

  switch (type) {

  case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t) fast_entry; break;

  case T_BYTE:    jni_fast_GetByteField_fp    = (GetByteField_t)    fast_entry; break;

  case T_CHAR:    jni_fast_GetCharField_fp    = (GetCharField_t)    fast_entry; break;

  case T_SHORT:   jni_fast_GetShortField_fp   = (GetShortField_t)   fast_entry; break;

  case T_INT:     jni_fast_GetIntField_fp     = (GetIntField_t)     fast_entry; break;

  }

  return os::win32::fast_jni_accessor_wrapper(type);

#endif

}

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 slow;

  // stack layout:    offset from rsp (in words):

  //  old rsi          0

  //  return pc        1

  //  jni env          2

  //  obj              3

  //  jfieldID         4

  ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());

  __ push  (rsi);

  __ mov32 (rcx, counter);

  __ testb (rcx, 1);

  __ jcc (Assembler::notZero, slow);

  if (os::is_MP()) {

    __ mov(rax, rcx);

    __ andptr(rax, 1);                         // rax, must end up 0

    __ movptr(rdx, Address(rsp, rax, Address::times_1, 3*wordSize));

                                              // obj, notice rax, is 0.

                                              // rdx is data dependent on rcx.

  } else {

    __ movptr(rdx, Address(rsp, 3*wordSize));  // obj

  }

  __ movptr(rsi, Address(rsp, 4*wordSize));  // jfieldID

  __ clear_jweak_tag(rdx);

  __ movptr(rdx, Address(rdx, 0));           // *obj

  __ shrptr(rsi, 2);                         // offset

  assert(count < LIST_CAPACITY-1, "LIST_CAPACITY too small");

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

  __ movptr(rax, Address(rdx, rsi, Address::times_1));

#ifndef _LP64

  speculative_load_pclist[count] = __ pc();

  __ movl(rdx, Address(rdx, rsi, Address::times_1, 4));

#endif // _LP64

  if (os::is_MP()) {

    __ lea(rsi, counter);

    __ xorptr(rsi, rdx);

    __ xorptr(rsi, rax);

    __ xorptr(rsi, rdx);

    __ xorptr(rsi, rax);

    __ cmp32(rcx, Address(rsi, 0));

    // ca1 is the same as ca because

    // rax, ^ rdx ^ counter_addr ^ rax, ^ rdx = address

    // ca1 is data dependent on both rax, and rdx.

  } else {

    __ cmp32(rcx, counter);

  }

  __ jcc (Assembler::notEqual, slow);

  __ pop (rsi);

#ifndef _WINDOWS

  __ ret (0);

#else

  // __stdcall calling convention

  __ ret (3*wordSize);

#endif

  slowcase_entry_pclist[count-1] = __ pc();

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

  __ bind (slow);

  __ pop  (rsi);

  address slow_case_addr = jni_GetLongField_addr();;

  // tail call

  __ jump (ExternalAddress(slow_case_addr));

  __ flush ();

#ifndef _WINDOWS

  return fast_entry;

#else

  jni_fast_GetLongField_fp = (GetLongField_t) fast_entry;

  return os::win32::fast_jni_accessor_wrapper(T_LONG);

#endif

}

address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {

  const char *name = NULL;

  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 slow_with_pop, slow;

  // stack layout:    offset from rsp (in words):

  //  return pc        0

  //  jni env          1

  //  obj              2

  //  jfieldID         3

  ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());

  __ mov32 (rcx, counter);

  __ testb (rcx, 1);

  __ jcc (Assembler::notZero, slow);

  if (os::is_MP()) {

    __ mov(rax, rcx);

    __ andptr(rax, 1);                         // rax, must end up 0

    __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));

                                              // obj, notice rax, is 0.

                                              // rdx is data dependent on rcx.

  } else {

    __ movptr(rdx, Address(rsp, 2*wordSize)); // obj

  }

  __ movptr(rax, Address(rsp, 3*wordSize));  // jfieldID

  __ clear_jweak_tag(rdx);

  __ movptr(rdx, Address(rdx, 0));           // *obj

  __ shrptr(rax, 2);                         // offset

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

  speculative_load_pclist[count] = __ pc();

  switch (type) {

#ifndef _LP64

    case T_FLOAT:  __ fld_s (Address(rdx, rax, Address::times_1)); break;

    case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;

#else

    case T_FLOAT:  __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;

    case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;

#endif // _LP64

    default:       ShouldNotReachHere();

  }

  Address ca1;

  if (os::is_MP()) {

    __ fst_s (Address(rsp, -4));

    __ lea(rdx, counter);

    __ movl (rax, Address(rsp, -4));

    // garbage hi-order bits on 64bit are harmless.

    __ xorptr(rdx, rax);

    __ xorptr(rdx, rax);

    __ cmp32(rcx, Address(rdx, 0));

                                          // rax, ^ counter_addr ^ rax, = address

                                          // ca1 is data dependent on the field

                                          // access.

  } else {

    __ cmp32(rcx, counter);

  }

  __ jcc (Assembler::notEqual, slow_with_pop);

#ifndef _WINDOWS

  __ ret (0);

#else

  // __stdcall calling convention

  __ ret (3*wordSize);

#endif

  __ bind (slow_with_pop);

  // invalid load. pop FPU stack.

  __ fstp_d (0);

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

  __ bind (slow);

  address slow_case_addr = NULL;

  switch (type) {

    case T_FLOAT:  slow_case_addr = jni_GetFloatField_addr();  break;

    case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;

    default:       ShouldNotReachHere();

  }

  // tail call

  __ jump (ExternalAddress(slow_case_addr));

  __ flush ();

#ifndef _WINDOWS

  return fast_entry;

#else

  switch (type) {

  case T_FLOAT:  jni_fast_GetFloatField_fp  = (GetFloatField_t)  fast_entry; break;

  case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t) fast_entry; break;

  }

  return os::win32::fast_jni_accessor_wrapper(type);

#endif

}

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);

}