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 /*

  * 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*wordSize

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

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

 // Common register usage:

 // rax/xmm0: result

 // c_rarg0:    jni env

 // c_rarg1:    obj

 // c_rarg2:    jfield id

 static const Register robj          = r9;

 static const Register rcounter      = r10;

 static const Register roffset       = r11;

 static const Register rcounter_addr = r11;

 // Warning: do not use rip relative addressing after the first counter load

 // since that may scratch r10!

 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;

     case T_LONG:    name = "jni_fast_GetLongField";    break;

     default:        ShouldNotReachHere();

   }

   ResourceMark rm;

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

   CodeBuffer cbuf(blob);

   MacroAssembler* masm = new MacroAssembler(&cbuf);

   address fast_entry = __ pc();

   Label slow;

   ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());

   __ mov32 (rcounter, counter);

   __ mov   (robj, c_rarg1);

   __ testb (rcounter, 1);

   __ jcc (Assembler::notZero, slow);

   if (os::is_MP()) {

     __ xorptr(robj, rcounter);

     __ xorptr(robj, rcounter);                  // obj, since

                                                 // robj ^ rcounter ^ rcounter == robj

                                                 // robj is data dependent on rcounter.

   }

   __ clear_jweak_tag(robj);

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

   __ mov   (roffset, c_rarg2);

   __ shrptr(roffset, 2);                        // offset

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

   speculative_load_pclist[count] = __ pc();

   switch (type) {

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

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

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

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

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

     case T_LONG:    __ movq   (rax, Address(robj, roffset, Address::times_1)); break;

     default:        ShouldNotReachHere();

   }

   if (os::is_MP()) {

     __ lea(rcounter_addr, counter);

     // ca is data dependent on rax.

     __ xorptr(rcounter_addr, rax);

     __ xorptr(rcounter_addr, rax);

     __ cmpl (rcounter, Address(rcounter_addr, 0));

   } else {

     __ cmp32 (rcounter, counter);

   }

   __ jcc (Assembler::notEqual, slow);

   __ ret (0);

   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();     break;

     case T_LONG:    slow_case_addr = jni_GetLongField_addr();

   }

   // tail call

   __ jump (ExternalAddress(slow_case_addr));

   __ 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() {

   return generate_fast_get_int_field0(T_LONG);

 }

 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);

   CodeBuffer cbuf(blob);

   MacroAssembler* masm = new MacroAssembler(&cbuf);

   address fast_entry = __ pc();

   Label slow;

   ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());

   __ mov32 (rcounter, counter);

   __ mov   (robj, c_rarg1);

   __ testb (rcounter, 1);

   __ jcc (Assembler::notZero, slow);

   if (os::is_MP()) {

     __ xorptr(robj, rcounter);

     __ xorptr(robj, rcounter);                  // obj, since

                                                 // robj ^ rcounter ^ rcounter == robj

                                                 // robj is data dependent on rcounter.

   }

   __ clear_jweak_tag(robj);

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

   __ mov   (roffset, c_rarg2);

   __ shrptr(roffset, 2);                        // offset

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

   speculative_load_pclist[count] = __ pc();

   switch (type) {

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

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

     default:        ShouldNotReachHere();

   }

   if (os::is_MP()) {

     __ lea(rcounter_addr, counter);

     __ movdq (rax, xmm0);

     // counter address is data dependent on xmm0.

     __ xorptr(rcounter_addr, rax);

     __ xorptr(rcounter_addr, rax);

     __ cmpl (rcounter, Address(rcounter_addr, 0));

   } else {

     __ cmp32 (rcounter, counter);

   }

   __ jcc (Assembler::notEqual, slow);

   __ ret (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();

   }

   // tail call

   __ jump (ExternalAddress(slow_case_addr));

   __ 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);

 }