src/hotspot/cpu/arm/jniFastGetField_arm.cpp
author dholmes
Wed, 03 Oct 2018 03:41:57 -0400
changeset 51996 84743156e780
parent 47216 71c04702a3d5
child 52351 0ecb4e520110
permissions -rw-r--r--
8188764: Obsolete AssumeMP and then remove all support for non-MP builds Reviewed-by: mikael, mdoerr, bulasevich, eosterlund
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/*
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 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "asm/macroAssembler.hpp"
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#include "assembler_arm.inline.hpp"
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#include "memory/resourceArea.hpp"
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#include "prims/jniFastGetField.hpp"
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#include "prims/jvm_misc.hpp"
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#include "runtime/safepoint.hpp"
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#define __ masm->
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#define BUFFER_SIZE  96
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address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
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  const char* name = NULL;
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  address slow_case_addr = NULL;
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  switch (type) {
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    case T_BOOLEAN:
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      name = "jni_fast_GetBooleanField";
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      slow_case_addr = jni_GetBooleanField_addr();
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      break;
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    case T_BYTE:
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      name = "jni_fast_GetByteField";
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      slow_case_addr = jni_GetByteField_addr();
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      break;
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    case T_CHAR:
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      name = "jni_fast_GetCharField";
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      slow_case_addr = jni_GetCharField_addr();
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      break;
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    case T_SHORT:
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      name = "jni_fast_GetShortField";
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      slow_case_addr = jni_GetShortField_addr();
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      break;
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    case T_INT:
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      name = "jni_fast_GetIntField";
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      slow_case_addr = jni_GetIntField_addr();
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      break;
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    case T_LONG:
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      name = "jni_fast_GetLongField";
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      slow_case_addr = jni_GetLongField_addr();
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      break;
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    case T_FLOAT:
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      name = "jni_fast_GetFloatField";
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      slow_case_addr = jni_GetFloatField_addr();
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      break;
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    case T_DOUBLE:
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      name = "jni_fast_GetDoubleField";
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      slow_case_addr = jni_GetDoubleField_addr();
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      break;
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    default:
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      ShouldNotReachHere();
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  }
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  // R0 - jni env
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  // R1 - object handle
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  // R2 - jfieldID
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  const Register Rsafepoint_counter_addr = AARCH64_ONLY(R4) NOT_AARCH64(R3);
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  const Register Robj = AARCH64_ONLY(R5) NOT_AARCH64(R1);
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  const Register Rres = AARCH64_ONLY(R6) NOT_AARCH64(R0);
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#ifndef AARCH64
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  const Register Rres_hi = R1;
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#endif // !AARCH64
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  const Register Rsafept_cnt = Rtemp;
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  const Register Rsafept_cnt2 = Rsafepoint_counter_addr;
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  const Register Rtmp1 = AARCH64_ONLY(R7) NOT_AARCH64(R3); // same as Rsafepoint_counter_addr on 32-bit ARM
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  const Register Rtmp2 = AARCH64_ONLY(R8) NOT_AARCH64(R2); // same as jfieldID on 32-bit ARM
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#ifdef AARCH64
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  assert_different_registers(Rsafepoint_counter_addr, Rsafept_cnt, Robj, Rres, Rtmp1, Rtmp2, R0, R1, R2, LR);
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  assert_different_registers(Rsafept_cnt2, Rsafept_cnt, Rres, R0, R1, R2, LR);
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#else
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  assert_different_registers(Rsafepoint_counter_addr, Rsafept_cnt, Robj, Rres, LR);
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  assert_different_registers(Rsafept_cnt, R1, R2, Rtmp1, LR);
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  assert_different_registers(Rsafepoint_counter_addr, Rsafept_cnt, Rres, Rres_hi, Rtmp2, LR);
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  assert_different_registers(Rsafept_cnt2, Rsafept_cnt, Rres, Rres_hi, LR);
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#endif // AARCH64
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  address fast_entry;
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  ResourceMark rm;
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  BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
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  CodeBuffer cbuf(blob);
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  MacroAssembler* masm = new MacroAssembler(&cbuf);
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  fast_entry = __ pc();
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  // Safepoint check
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  InlinedAddress safepoint_counter_addr(SafepointSynchronize::safepoint_counter_addr());
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  Label slow_case;
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  __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr);
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#ifndef AARCH64
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  __ push(RegisterSet(R0, R3));  // save incoming arguments for slow case
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#endif // !AARCH64
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  __ ldr_s32(Rsafept_cnt, Address(Rsafepoint_counter_addr));
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  __ tbnz(Rsafept_cnt, 0, slow_case);
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#ifdef AARCH64
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  // If mask changes we need to ensure that the inverse is still encodable as an immediate
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  STATIC_ASSERT(JNIHandles::weak_tag_mask == 1);
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  __ andr(R1, R1, ~JNIHandles::weak_tag_mask);
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#else
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  __ bic(R1, R1, JNIHandles::weak_tag_mask);
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#endif
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  // Address dependency restricts memory access ordering. It's cheaper than explicit LoadLoad barrier
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  __ andr(Rtmp1, Rsafept_cnt, (unsigned)1);
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  __ ldr(Robj, Address(R1, Rtmp1));
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#ifdef AARCH64
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  __ add(Robj, Robj, AsmOperand(R2, lsr, 2));
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  Address field_addr = Address(Robj);
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#else
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  Address field_addr;
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  if (type != T_BOOLEAN
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      && type != T_INT
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#ifndef __ABI_HARD__
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      && type != T_FLOAT
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#endif // !__ABI_HARD__
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      ) {
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    // Only ldr and ldrb support embedded shift, other loads do not
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    __ add(Robj, Robj, AsmOperand(R2, lsr, 2));
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    field_addr = Address(Robj);
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   148
  } else {
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   149
    field_addr = Address(Robj, R2, lsr, 2);
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  }
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   151
#endif // AARCH64
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  assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
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   153
  speculative_load_pclist[count] = __ pc();
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   154
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   155
  switch (type) {
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   156
    case T_BOOLEAN:
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   157
      __ ldrb(Rres, field_addr);
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   158
      break;
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   159
    case T_BYTE:
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   160
      __ ldrsb(Rres, field_addr);
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   161
      break;
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   162
    case T_CHAR:
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   163
      __ ldrh(Rres, field_addr);
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bobv
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   164
      break;
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   165
    case T_SHORT:
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   166
      __ ldrsh(Rres, field_addr);
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   167
      break;
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   168
    case T_INT:
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   169
#ifndef __ABI_HARD__
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   170
    case T_FLOAT:
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   171
#endif
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   172
      __ ldr_s32(Rres, field_addr);
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   173
      break;
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bobv
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   174
    case T_LONG:
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   175
#ifndef __ABI_HARD__
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   176
    case T_DOUBLE:
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   177
#endif
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   178
#ifdef AARCH64
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      __ ldr(Rres, field_addr);
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   180
#else
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      // Safe to use ldrd since long and double fields are 8-byte aligned
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   182
      __ ldrd(Rres, field_addr);
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   183
#endif // AARCH64
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   184
      break;
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parents:
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   185
#ifdef __ABI_HARD__
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   186
    case T_FLOAT:
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   187
      __ ldr_float(S0, field_addr);
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   188
      break;
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   189
    case T_DOUBLE:
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   190
      __ ldr_double(D0, field_addr);
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   191
      break;
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   192
#endif // __ABI_HARD__
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   193
    default:
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   194
      ShouldNotReachHere();
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   195
  }
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   196
51996
84743156e780 8188764: Obsolete AssumeMP and then remove all support for non-MP builds
dholmes
parents: 47216
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   197
  // Address dependency restricts memory access ordering. It's cheaper than explicit LoadLoad barrier
42664
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   198
#if defined(__ABI_HARD__) && !defined(AARCH64)
51996
84743156e780 8188764: Obsolete AssumeMP and then remove all support for non-MP builds
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   199
  if (type == T_FLOAT || type == T_DOUBLE) {
84743156e780 8188764: Obsolete AssumeMP and then remove all support for non-MP builds
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    __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr);
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    __ fmrrd(Rres, Rres_hi, D0);
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   202
    __ eor(Rtmp2, Rres, Rres);
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   203
    __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr, Rtmp2));
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parents: 47216
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   204
  } else
42664
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   205
#endif // __ABI_HARD__ && !AARCH64
51996
84743156e780 8188764: Obsolete AssumeMP and then remove all support for non-MP builds
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   206
  {
42664
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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parents:
diff changeset
   207
#ifndef AARCH64
51996
84743156e780 8188764: Obsolete AssumeMP and then remove all support for non-MP builds
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   208
    __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr);
42664
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   209
#endif // !AARCH64
51996
84743156e780 8188764: Obsolete AssumeMP and then remove all support for non-MP builds
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   210
    __ eor(Rtmp2, Rres, Rres);
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parents: 47216
diff changeset
   211
    __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr, Rtmp2));
42664
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   212
  }
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   213
  __ cmp(Rsafept_cnt2, Rsafept_cnt);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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parents:
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   214
#ifdef AARCH64
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   215
  __ b(slow_case, ne);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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parents:
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   216
  __ mov(R0, Rres);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   217
  __ ret();
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parents:
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   218
#else
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   219
  // discards saved R0 R1 R2 R3
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   220
  __ add(SP, SP, 4 * wordSize, eq);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   221
  __ bx(LR, eq);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   222
#endif // AARCH64
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   223
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   224
  slowcase_entry_pclist[count++] = __ pc();
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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parents:
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   225
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   226
  __ bind(slow_case);
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   227
#ifndef AARCH64
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   228
  __ pop(RegisterSet(R0, R3));
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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parents:
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   229
#endif // !AARCH64
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   230
  // thumb mode switch handled by MacroAssembler::jump if needed
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   231
  __ jump(slow_case_addr, relocInfo::none, Rtemp);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   232
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   233
  __ bind_literal(safepoint_counter_addr);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   234
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
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   235
  __ flush();
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   236
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
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   237
  guarantee((__ pc() - fast_entry) <= BUFFER_SIZE, "BUFFER_SIZE too small");
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   238
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   239
  return fast_entry;
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   240
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   241
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   242
address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   243
  ShouldNotReachHere();
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   244
  return NULL;
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   245
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   246
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   247
address JNI_FastGetField::generate_fast_get_boolean_field() {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   248
  return generate_fast_get_int_field0(T_BOOLEAN);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   249
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   250
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   251
address JNI_FastGetField::generate_fast_get_byte_field() {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   252
  return generate_fast_get_int_field0(T_BYTE);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   253
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   254
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   255
address JNI_FastGetField::generate_fast_get_char_field() {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   256
  return generate_fast_get_int_field0(T_CHAR);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   257
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   258
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   259
address JNI_FastGetField::generate_fast_get_short_field() {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   260
  return generate_fast_get_int_field0(T_SHORT);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   261
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   262
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   263
address JNI_FastGetField::generate_fast_get_int_field() {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   264
  return generate_fast_get_int_field0(T_INT);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   265
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   266
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   267
address JNI_FastGetField::generate_fast_get_long_field() {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   268
  return generate_fast_get_int_field0(T_LONG);
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bobv
parents:
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   269
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   270
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   271
address JNI_FastGetField::generate_fast_get_float_field() {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   272
  return generate_fast_get_int_field0(T_FLOAT);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   273
}
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
diff changeset
   274
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   275
address JNI_FastGetField::generate_fast_get_double_field() {
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   276
  return generate_fast_get_int_field0(T_DOUBLE);
29142a56c193 8168503: JEP 297: Unified arm32/arm64 Port
bobv
parents:
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   277
}