1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "runtime/arguments.hpp"
  27 #include "runtime/commandLineFlagConstraintsCompiler.hpp"
  28 #include "runtime/globals.hpp"
  29 #include "utilities/defaultStream.hpp"
  30 
  31 Flag::Error AliasLevelConstraintFunc(bool verbose, intx* value) {
  32   if (CommandLineFlags::finishedInitializing() == true) {
  33     if ((*value <= 1) && (Arguments::mode() == Arguments::_comp)) {
  34       if (verbose == true) {
  35         jio_fprintf(defaultStream::error_stream(),
  36                   "AliasLevel (" INTX_FORMAT ") is not compatible "
  37                   "with -Xcomp \n",
  38                   *value);
  39       }
  40       return Flag::VIOLATES_CONSTRAINT;
  41     }
  42   }
  43   return Flag::SUCCESS;
  44 }
  45 
  46 /**
  47  * Validate the minimum number of compiler threads needed to run the
  48  * JVM. The following configurations are possible.
  49  *
  50  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
  51  *    compiler threads is 0.
  52  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
  53  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
  54  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
  55  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
  56  *    C1 can be used, so the minimum number of compiler threads is 1.
  57  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
  58  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
  59  *    the minimum number of compiler threads is 2.
  60  */
  61 Flag::Error CICompilerCountConstraintFunc(bool verbose, intx* value) {
  62   int min_number_of_compiler_threads = 0;
  63 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
  64   // case 1
  65 #else
  66   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
  67     min_number_of_compiler_threads = 1; // case 2 or case 3
  68   } else {
  69     min_number_of_compiler_threads = 2;   // case 4 (tiered)
  70   }
  71 #endif
  72 
  73   // The default CICompilerCount's value is CI_COMPILER_COUNT.
  74   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
  75 
  76   if (*value < (intx)min_number_of_compiler_threads) {
  77     if (verbose == true) {
  78       jio_fprintf(defaultStream::error_stream(),
  79                   "CICompilerCount=" INTX_FORMAT " must be at least %d \n",
  80                   *value, min_number_of_compiler_threads);
  81     }
  82     return Flag::VIOLATES_CONSTRAINT;
  83   } else {
  84     return Flag::SUCCESS;
  85   }
  86 }