JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2016, 2019 SAP SE. 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.
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#ifndef CPU_S390_DISASSEMBLER_S390_HPP
#define CPU_S390_DISASSEMBLER_S390_HPP

  static int pd_instruction_alignment() {
    return 2;
  }

  static const char* pd_cpu_opts() {
    return "s390";
  }

  static bool valid_opcodes[256];
  static bool is_valid_opcode_at(address here);

  // Find preceding instruction.
  //
  // Starting at the passed location, the n-th preceding (towards lower addresses)
  // location is searched, the contents of which - if interpreted as
  // instructions - has the passed location as n-th successor.
  //  - If multiple such locations exist between (here-n*instr_maxlen()) and here,
  //    the most distant location is selected.
  //  - If no such location exists, NULL is returned. The caller should then
  //    terminate its search and react properly.
  static address find_prev_instr(address here, int n_instr);
  static int     count_instr(address begin, address end);

  // special-case instruction decoding.
  // There may be cases where the binutils disassembler doesn't do
  // the perfect job. In those cases, decode_instruction0 may kick in
  // and do it right.
  // If nothing had to be done, just return "here", otherwise return "here + instr_len(here)"

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