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 
 30 #include "runtime/atomic.hpp"
 31 
 32 inline address Method::from_compiled_entry() const {
 33   return Atomic::load_acquire(&_from_compiled_entry);
 34 }
 35 
 36 inline address Method::from_compiled_inline_ro_entry() const {
 37   return Atomic::load_acquire(&_from_compiled_inline_ro_entry);
 38 }
 39 
 40 inline address Method::from_compiled_inline_entry() const {
 41   return Atomic::load_acquire(&_from_compiled_inline_entry);
 42 }
 43 
 44 inline address Method::from_interpreted_entry() const {
 45   return Atomic::load_acquire(&_from_interpreted_entry);
 46 }
 47 
 48 inline void Method::set_method_data(MethodData* data) {
 49   // The store into method must be released. On platforms without
 50   // total store order (TSO) the reference may become visible before
 51   // the initialization of data otherwise.
 52   Atomic::release_store(&_method_data, data);
 53 }
 54 
 55 inline CompiledMethod* volatile Method::code() const {
 56   assert( check_code(), "" );
 57   return Atomic::load_acquire(&_code);
 58 }
 59 
 60 // Write (bci, line number) pair to stream
 61 inline void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
 62   // bci and line number does not compress into single byte.
 63   // Write out escape character and use regular compression for bci and line number.
 64   write_byte((jubyte)0xFF);
 65   write_signed_int(bci_delta);
 66   write_signed_int(line_delta);
 67 }
 68 
 69 inline void CompressedLineNumberWriteStream::write_pair_inline(int bci, int line) {
 70   int bci_delta = bci - _bci;
 71   int line_delta = line - _line;
 72   _bci = bci;
 73   _line = line;
 74   // Skip (0,0) deltas - they do not add information and conflict with terminator.
 75   if (bci_delta == 0 && line_delta == 0) return;
 76   // Check if bci is 5-bit and line number 3-bit unsigned.
 77   if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
 78     // Compress into single byte.
 79     jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
 80     // Check that value doesn't match escape character.
 81     if (value != 0xFF) {
 82       write_byte(value);
 83       return;
 84     }
 85   }
 86   write_pair_regular(bci_delta, line_delta);
 87 }
 88 
 89 inline void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
 90   write_pair_inline(bci, line);
 91 }
 92 
 93 inline bool Method::has_compiled_code() const { return code() != NULL; }
 94 
 95 inline bool Method::is_empty_method() const {
 96   return  code_size() == 1
 97       && *code_base() == Bytecodes::_return;
 98 }
 99 
100 #endif // SHARE_OOPS_METHOD_INLINE_HPP