view src/share/vm/interpreter/bytecodeStream.cpp @ 1578:ab102d5d923e

6939207: refactor constant pool index processing Summary: Factored cleanup of instruction decode which prepares for enhanced ldc semantics. Reviewed-by: twisti
author jrose
date Sun, 23 May 2010 01:38:26 -0700
parents ad8c8ca4ab0f
children e9ff18c4ace7
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/*
 * Copyright 1997-2010 Sun Microsystems, 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

# include "incls/_precompiled.incl"
# include "incls/_bytecodeStream.cpp.incl"

Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) {
  assert(!is_last_bytecode(), "should have been checked");
  // set next bytecode position
  address bcp = RawBytecodeStream::bcp();
  address end = method()->code_base() + end_bci();
  int l = Bytecodes::raw_special_length_at(bcp, end);
  if (l <= 0 || (_bci + l) > _end_bci) {
    code = Bytecodes::_illegal;
  } else {
    _next_bci += l;
    assert(_bci < _next_bci, "length must be > 0");
    // set attributes
    _is_wide = false;
    // check for special (uncommon) cases
    if (code == Bytecodes::_wide) {
      if (bcp + 1 >= end) {
        code = Bytecodes::_illegal;
      } else {
        code = (Bytecodes::Code)bcp[1];
        _is_wide = true;
      }
    }
  }
  _raw_code = code;
  return code;
}

#ifdef ASSERT
void BaseBytecodeStream::assert_raw_index_size(int size) const {
  if (raw_code() == Bytecodes::_invokedynamic && is_raw()) {
    // in raw mode, pretend indy is "bJJ__"
    assert(size == 2, "raw invokedynamic instruction has 2-byte index only");
  } else {
    bytecode()->assert_index_size(size, raw_code(), is_wide());
  }
}

void BaseBytecodeStream::assert_raw_stream(bool want_raw) const {
  if (want_raw) {
    assert( is_raw(), "this function only works on raw streams");
  } else {
    assert(!is_raw(), "this function only works on non-raw streams");
  }
}
#endif //ASSERT