hotspot/src/share/vm/runtime/commandLineFlagConstraintsCompiler.cpp
author roland
Wed, 29 Jul 2015 12:33:48 +0200
changeset 32083 1796911eb140
parent 31959 34180370555e
child 32087 dcbcf15229a9
permissions -rw-r--r--
8132525: java -client -XX:+TieredCompilation -XX:CICompilerCount=1 -version asserts since 8130858 Summary: TieredCompilation not validated when CICompilerCount is processed Reviewed-by: kvn, gziemski
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/*
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/commandLineFlagConstraintsCompiler.hpp"
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#include "runtime/globals.hpp"
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#include "utilities/defaultStream.hpp"
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Flag::Error AliasLevelConstraintFunc(bool verbose, intx* value) {
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  if (CommandLineFlags::finishedInitializing() == true) {
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    if ((*value <= 1) && (Arguments::mode() == Arguments::_comp)) {
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      if (verbose == true) {
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        jio_fprintf(defaultStream::error_stream(),
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                  "AliasLevel (" INTX_FORMAT ") is not compatible "
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                  "with -Xcomp \n",
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                  *value);
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      }
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      return Flag::VIOLATES_CONSTRAINT;
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    }
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  }
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  return Flag::SUCCESS;
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}
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/**
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 * Validate the minimum number of compiler threads needed to run the
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 * JVM. The following configurations are possible.
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 *
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 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
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 *    compiler threads is 0.
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 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
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 *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
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 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
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 *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
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 *    C1 can be used, so the minimum number of compiler threads is 1.
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 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
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 *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
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 *    the minimum number of compiler threads is 2.
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 */
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Flag::Error CICompilerCountConstraintFunc(bool verbose, intx* value) {
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  int min_number_of_compiler_threads = 0;
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#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
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  // case 1
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#else
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  if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
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    min_number_of_compiler_threads = 1; // case 2 or case 3
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  } else {
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    min_number_of_compiler_threads = 2;   // case 4 (tiered)
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  }
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#endif
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  // The default CICompilerCount's value is CI_COMPILER_COUNT.
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  // With a client VM, -XX:+TieredCompilation causes TieredCompilation
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  // to be true here (the option is validated later) and
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  // min_number_of_compiler_threads to exceed CI_COMPILER_COUNT.
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  min_number_of_compiler_threads = MIN2(min_number_of_compiler_threads, CI_COMPILER_COUNT);
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  if (*value < (intx)min_number_of_compiler_threads) {
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    if (verbose == true) {
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      jio_fprintf(defaultStream::error_stream(),
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                  "CICompilerCount=" INTX_FORMAT " must be at least %d \n",
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                  *value, min_number_of_compiler_threads);
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    }
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    return Flag::VIOLATES_CONSTRAINT;
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  } else {
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    return Flag::SUCCESS;
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  }
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}