view src/share/vm/opto/c2compiler.hpp @ 1994:6cd6d394f280

7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed()) 7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages. Reviewed-by: johnc, tonyp
author ysr
date Tue, 07 Dec 2010 21:55:53 -0800
parents f95d63e2154a
children 5d0bb7d52783 469216acdb28
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/*
 * Copyright (c) 1999, 2010, 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_OPTO_C2COMPILER_HPP
#define SHARE_VM_OPTO_C2COMPILER_HPP

#include "compiler/abstractCompiler.hpp"

class C2Compiler : public AbstractCompiler {
private:

  static void initialize_runtime();

public:
  // Name
  const char *name() { return "C2"; }

  static volatile int _runtimes;

#ifdef TIERED
  virtual bool is_c2() { return true; };
#endif // TIERED

  // Customization
  bool needs_adapters         () { return true; }
  bool needs_stubs            () { return true; }

  void initialize();

  // Compilation entry point for methods
  void compile_method(ciEnv* env,
                      ciMethod* target,
                      int entry_bci);

  // sentinel value used to trigger backtracking in compile_method().
  static const char* retry_no_subsuming_loads();
  static const char* retry_no_escape_analysis();

  // Print compilation timers and statistics
  void print_timers();
};

#endif // SHARE_VM_OPTO_C2COMPILER_HPP