1 /*
   2  * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_OOPS_METHOD_INLINE_HPP
  26 #define SHARE_OOPS_METHOD_INLINE_HPP
  27 
  28 #include "oops/method.hpp"
  29 #include "runtime/orderAccess.hpp"
  30 
  31 inline address Method::from_compiled_entry() const {
  32   return Atomic::load_acquire(&_from_compiled_entry);
  33 }
  34 
  35 inline address Method::from_interpreted_entry() const {
  36   return Atomic::load_acquire(&_from_interpreted_entry);
  37 }
  38 
  39 inline void Method::set_method_data(MethodData* data) {
  40   // The store into method must be released. On platforms without
  41   // total store order (TSO) the reference may become visible before
  42   // the initialization of data otherwise.
  43   Atomic::release_store(&_method_data, data);
  44 }
  45 
  46 inline CompiledMethod* volatile Method::code() const {
  47   assert( check_code(), "" );
  48   return Atomic::load_acquire(&_code);
  49 }
  50 
  51 // Write (bci, line number) pair to stream
  52 inline void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
  53   // bci and line number does not compress into single byte.
  54   // Write out escape character and use regular compression for bci and line number.
  55   write_byte((jubyte)0xFF);
  56   write_signed_int(bci_delta);
  57   write_signed_int(line_delta);
  58 }
  59 
  60 inline void CompressedLineNumberWriteStream::write_pair_inline(int bci, int line) {
  61   int bci_delta = bci - _bci;
  62   int line_delta = line - _line;
  63   _bci = bci;
  64   _line = line;
  65   // Skip (0,0) deltas - they do not add information and conflict with terminator.
  66   if (bci_delta == 0 && line_delta == 0) return;
  67   // Check if bci is 5-bit and line number 3-bit unsigned.
  68   if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
  69     // Compress into single byte.
  70     jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
  71     // Check that value doesn't match escape character.
  72     if (value != 0xFF) {
  73       write_byte(value);
  74       return;
  75     }
  76   }
  77   write_pair_regular(bci_delta, line_delta);
  78 }
  79 
  80 inline void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
  81   write_pair_inline(bci, line);
  82 }
  83 
  84 inline bool Method::has_compiled_code() const { return code() != NULL; }
  85 
  86 #endif // SHARE_OOPS_METHOD_INLINE_HPP