src/hotspot/cpu/ppc/vtableStubs_ppc_64.cpp
author mdoerr
Thu, 01 Feb 2018 11:58:38 +0100
changeset 48717 7a5835a47adf
parent 48585 d9fcb7ba8133
child 51618 54b344d9dd4e
permissions -rw-r--r--
8196503: PPC64: vtableStubs gtest fails after 8174962 Reviewed-by: goetz
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/*
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 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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 * Copyright (c) 2012, 2018 SAP SE. 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.inline.hpp"
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#include "code/vtableStubs.hpp"
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#include "interp_masm_ppc.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/compiledICHolder.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/klassVtable.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "vmreg_ppc.inline.hpp"
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#ifdef COMPILER2
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#include "opto/runtime.hpp"
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#endif
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#define __ masm->
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#ifdef PRODUCT
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#define BLOCK_COMMENT(str) // nothing
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#else
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#define BLOCK_COMMENT(str) __ block_comment(str)
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#endif
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#define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
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#ifndef PRODUCT
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extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
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#endif
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// Used by compiler only; may use only caller saved, non-argument
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// registers.
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VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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  // PPC port: use fixed size.
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  const int code_length = VtableStub::pd_code_size_limit(true);
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  VtableStub* s = new (code_length) VtableStub(true, vtable_index);
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  // Can be NULL if there is no free space in the code cache.
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  if (s == NULL) {
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    return NULL;
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  }
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  ResourceMark rm;
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  CodeBuffer cb(s->entry_point(), code_length);
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  MacroAssembler* masm = new MacroAssembler(&cb);
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#ifndef PRODUCT
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  if (CountCompiledCalls) {
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    int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true);
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    __ lwz(R12_scratch2, offs, R11_scratch1);
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    __ addi(R12_scratch2, R12_scratch2, 1);
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    __ stw(R12_scratch2, offs, R11_scratch1);
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  }
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#endif
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  assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
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  // Get receiver klass.
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  const Register rcvr_klass = R11_scratch1;
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  // We might implicit NULL fault here.
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  address npe_addr = __ pc(); // npe = null pointer exception
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  __ null_check(R3, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
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  __ load_klass(rcvr_klass, R3);
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 // Set method (in case of interpreted method), and destination address.
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  int entry_offset = in_bytes(Klass::vtable_start_offset()) + vtable_index*vtableEntry::size_in_bytes();
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#ifndef PRODUCT
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  if (DebugVtables) {
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    Label L;
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    // Check offset vs vtable length.
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    const Register vtable_len = R12_scratch2;
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    __ lwz(vtable_len, in_bytes(Klass::vtable_length_offset()), rcvr_klass);
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    __ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size());
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    __ bge(CCR0, L);
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    __ li(R12_scratch2, vtable_index);
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    __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false);
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    __ bind(L);
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  }
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#endif
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  int v_off = entry_offset + vtableEntry::method_offset_in_bytes();
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  __ ld(R19_method, (RegisterOrConstant)v_off, rcvr_klass);
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#ifndef PRODUCT
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  if (DebugVtables) {
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    Label L;
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    __ cmpdi(CCR0, R19_method, 0);
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    __ bne(CCR0, L);
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    __ stop("Vtable entry is ZERO", 102);
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    __ bind(L);
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  }
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#endif
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  // If the vtable entry is null, the method is abstract.
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  address ame_addr = __ pc(); // ame = abstract method error
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  __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), /*implicit only*/NULL);
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  __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
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  __ mtctr(R12_scratch2);
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  __ bctr();
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  masm->flush();
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  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
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  s->set_exception_points(npe_addr, ame_addr);
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  return s;
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}
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VtableStub* VtableStubs::create_itable_stub(int itable_index) {
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  // PPC port: use fixed size.
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  const int code_length = VtableStub::pd_code_size_limit(false);
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  VtableStub* s = new (code_length) VtableStub(false, itable_index);
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  // Can be NULL if there is no free space in the code cache.
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  if (s == NULL) {
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    return NULL;
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  }
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  ResourceMark rm;
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  CodeBuffer cb(s->entry_point(), code_length);
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  MacroAssembler* masm = new MacroAssembler(&cb);
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  address start_pc;
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#ifndef PRODUCT
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  if (CountCompiledCalls) {
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    int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true);
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    __ lwz(R12_scratch2, offs, R11_scratch1);
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    __ addi(R12_scratch2, R12_scratch2, 1);
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    __ stw(R12_scratch2, offs, R11_scratch1);
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  }
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#endif
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  assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
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  // Entry arguments:
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  //  R19_method: Interface
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  //  R3_ARG1:    Receiver
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  Label L_no_such_interface;
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  const Register rcvr_klass = R11_scratch1,
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                 interface  = R12_scratch2,
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                 tmp1       = R21_tmp1,
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                 tmp2       = R22_tmp2;
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  address npe_addr = __ pc(); // npe = null pointer exception
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  __ null_check(R3_ARG1, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
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  __ load_klass(rcvr_klass, R3_ARG1);
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  // Receiver subtype check against REFC.
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  __ ld(interface, CompiledICHolder::holder_klass_offset(), R19_method);
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  __ lookup_interface_method(rcvr_klass, interface, noreg,
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                             R0, tmp1, tmp2,
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                             L_no_such_interface, /*return_method=*/ false);
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  // Get Method* and entrypoint for compiler
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  __ ld(interface, CompiledICHolder::holder_metadata_offset(), R19_method);
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  __ lookup_interface_method(rcvr_klass, interface, itable_index,
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                             R19_method, tmp1, tmp2,
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                             L_no_such_interface, /*return_method=*/ true);
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#ifndef PRODUCT
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  if (DebugVtables) {
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    Label ok;
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    __ cmpd(CCR0, R19_method, 0);
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    __ bne(CCR0, ok);
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    __ stop("method is null", 103);
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    __ bind(ok);
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  }
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#endif
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   196
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  // If the vtable entry is null, the method is abstract.
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   198
  address ame_addr = __ pc(); // ame = abstract method error
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   199
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   200
  // Must do an explicit check if implicit checks are disabled.
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  __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), &L_no_such_interface);
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  __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
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  __ mtctr(R12_scratch2);
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  __ bctr();
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   205
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  // Handle IncompatibleClassChangeError in itable stubs.
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   207
  // More detailed error message.
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   208
  // We force resolving of the call site by jumping to the "handle
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  // wrong method" stub, and so let the interpreter runtime do all the
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  // dirty work.
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   211
  __ bind(L_no_such_interface);
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  __ load_const_optimized(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub(), R12_scratch2);
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  __ mtctr(R11_scratch1);
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   214
  __ bctr();
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   215
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  masm->flush();
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   217
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  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
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   219
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  s->set_exception_points(npe_addr, ame_addr);
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   221
  return s;
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   222
}
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   223
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   224
int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
40032
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   225
  if (DebugVtables || CountCompiledCalls || VerifyOops) {
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   226
    return 1000;
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   227
  }
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   228
  int size = is_vtable_stub ? 20 + 8 : 164 + 20; // Plain + safety
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   229
  if (UseCompressedClassPointers) {
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   230
    size += MacroAssembler::instr_size_for_decode_klass_not_null();
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   231
  }
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   232
  if (!ImplicitNullChecks || !os::zero_page_read_protected()) {
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   233
    size += is_vtable_stub ? 8 : 12;
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   234
  }
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   235
  return size;
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}
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   237
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int VtableStub::pd_code_alignment() {
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  const unsigned int icache_line_size = 32;
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  return icache_line_size;
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   241
}