Quelle icBuffer_aarch64.cpp Sprache: C

/*
* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, Red Hat Inc. 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
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* questions.
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*/

#include "precompiled.hpp"
#include "asm/macroAssembler.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "code/icBuffer.hpp"
#include "gc/shared/collectedHeap.inline.hpp"
#include "interpreter/bytecodes.hpp"
#include "memory/resourceArea.hpp"
#include "nativeInst_aarch64.hpp"
#include "oops/oop.inline.hpp"

int InlineCacheBuffer::ic_stub_code_size() {
  return (MacroAssembler::far_branches() ? 6 : 4) * NativeInstruction::instruction_size;
}

#define __ masm->

void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {
  ResourceMark rm;
  CodeBuffer      code(code_begin, ic_stub_code_size());
  MacroAssembler* masm            = new MacroAssembler(&code);
  // note: even though the code contains an embedded value, we do not need reloc info
  // because
  // (1) the value is old (i.e., doesn't matter for scavenges)
  // (2) these ICStubs are removed *before* a GC happens, so the roots disappear
  // assert(cached_value == NULL || cached_oop->is_perm(), "must be perm oop");

  address start = __ pc();
  Label l;
  __ ldr(rscratch2, l);
  int jump_code_size = __ far_jump(ExternalAddress(entry_point));
  // IC stub code size is not expected to vary depending on target address.
  // We use NOPs to make the [ldr + far_jump + nops + int64] stub size equal to ic_stub_code_size.
  for (int size = NativeInstruction::instruction_size + jump_code_size + 8;
           size < ic_stub_code_size(); size += NativeInstruction::instruction_size) {
    __ nop();
  }
  __ bind(l);
  assert((uintptr_t)__ pc() % wordSize == 0, "");
  __ emit_int64((int64_t)cached_value);
  // Only need to invalidate the 1st two instructions - not the whole ic stub
  ICache::invalidate_range(code_begin, InlineCacheBuffer::ic_stub_code_size());
  assert(__ pc() - start == ic_stub_code_size(), "must be");
}

address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
  NativeJump* jump = nativeJump_at(code_begin + 4);
  return jump->jump_destination();
}

void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
  // The word containing the cached value is at the end of this IC buffer
  uintptr_t *p = (uintptr_t *)(code_begin + ic_stub_code_size() - wordSize);
  void* o = (void*)*p;
  return o;
}

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