view src/share/vm/runtime/globals_ext.hpp @ 11825:463f51256c86

AMD64HotSpot: emit jump to IC miss handler directly instead of emitting it inside verfied_entry for empty methods we emitted something like this if a inline cache is needed: prefix: 00: < IC check > ... 0b: jne <ic_miss_call> 11: nop ... verified_entry: 20: ret ic_miss_call: 21: jmp <entry of runtime function> when a method is deoptimized, HotSpot patches the verified_entry (0x20) with a jump to a stub that handles call-sites that has been made non-entrant. since this jump is 5 bytes long, it will overwrite ic_miss_call and blow up every caller that calls this method via the unverified entry (prefix). the fix is to emit the jump to the runtime function inside the unverfied entry: prefix: 00: < IC check > ... 0b: je <verified_entry> 11: jeq <entry of runtime function> 16: nop ... verified_entry: 20: ret
author Bernhard Urban <bernhard.urban@jku.at>
date Mon, 30 Sep 2013 09:32:18 +0200
parents 80fe40862b02
children
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/*
 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_RUNTIME_GLOBALS_EXT_HPP
#define SHARE_VM_RUNTIME_GLOBALS_EXT_HPP

// globals_extension.hpp extension

// Additional CommandLineFlags enum values
#define COMMANDLINEFLAG_EXT

// Additional CommandLineFlagsWithType enum values
#define COMMANDLINEFLAGWITHTYPE_EXT


// globals.cpp extension

// Additional flag definitions
#define MATERIALIZE_FLAGS_EXT

// Additional flag descriptors: see flagTable definition
#define FLAGTABLE_EXT


// Default method implementations

inline bool Flag::is_unlocker_ext() const {
  return false;
}

inline bool Flag::is_unlocked_ext() const {
  return true;
}

inline bool Flag::is_writeable_ext() const {
  return false;
}

inline bool Flag::is_external_ext() const {
  return false;
}

inline void Flag::get_locked_message_ext(char* buf, int buflen) const {
  assert(buf != NULL, "Buffer cannot be NULL");
  buf[0] = '\0';
}

#endif // SHARE_VM_RUNTIME_GLOBALS_EXT_HPP