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 #ifndef SHARE_VM_RUNTIME_COMMANDLINEFLAGCONSTRAINTLIST_HPP
  26 #define SHARE_VM_RUNTIME_COMMANDLINEFLAGCONSTRAINTLIST_HPP
  27 
  28 #include "runtime/globals.hpp"
  29 #include "utilities/growableArray.hpp"
  30 
  31 /*
  32  * Here we have a mechanism for extracting constraints (as custom functions) for flags,
  33  * which otherwise can not be expressed via simple range check, specified in flag macro tables.
  34  *
  35  * An example of a constraint is "flag1 < flag2" where both flag1 and flag2 can change.
  36  *
  37  * See runtime "runtime/commandLineFlagConstraintsCompiler.hpp",
  38  * "runtime/commandLineFlagConstraintsGC.hpp" and 
  39  * "runtime/commandLineFlagConstraintsRuntime.hpp" for the functions themselves.
  40  */
  41 
  42 typedef Flag::Error (*CommandLineFlagConstraintFunc_bool)(bool verbose, bool* value);
  43 typedef Flag::Error (*CommandLineFlagConstraintFunc_int)(bool verbose, int* value);
  44 typedef Flag::Error (*CommandLineFlagConstraintFunc_intx)(bool verbose, intx* value);
  45 typedef Flag::Error (*CommandLineFlagConstraintFunc_uint)(bool verbose, uint* value);
  46 typedef Flag::Error (*CommandLineFlagConstraintFunc_uintx)(bool verbose, uintx* value);
  47 typedef Flag::Error (*CommandLineFlagConstraintFunc_uint64_t)(bool verbose, uint64_t* value);
  48 typedef Flag::Error (*CommandLineFlagConstraintFunc_size_t)(bool verbose, size_t* value);
  49 typedef Flag::Error (*CommandLineFlagConstraintFunc_double)(bool verbose, double* value);
  50 
  51 class CommandLineFlagConstraint : public CHeapObj<mtInternal> {
  52 public:
  53   const char* _name;
  54   CommandLineFlagConstraint(const char* name) { _name=name; };
  55   ~CommandLineFlagConstraint() {};
  56   const char* name() { return _name; }
  57   virtual Flag::Error apply_bool(bool* value, bool verbose = true) { return Flag::SUCCESS; };
  58   virtual Flag::Error apply_int(int* value, bool verbose = true) { return Flag::SUCCESS; };
  59   virtual Flag::Error apply_intx(intx* value, bool verbose = true) { return Flag::SUCCESS; };
  60   virtual Flag::Error apply_uint(uint* value, bool verbose = true) { return Flag::SUCCESS; };
  61   virtual Flag::Error apply_uintx(uintx* value, bool verbose = true) { return Flag::SUCCESS; };
  62   virtual Flag::Error apply_uint64_t(uint64_t* value, bool verbose = true) { return Flag::SUCCESS; };
  63   virtual Flag::Error apply_size_t(size_t* value, bool verbose = true) { return Flag::SUCCESS; };
  64   virtual Flag::Error apply_double(double* value, bool verbose = true) { return Flag::SUCCESS; };
  65 };
  66 
  67 class CommandLineFlagConstraintList : public CHeapObj<mtInternal> {
  68   static GrowableArray<CommandLineFlagConstraint*>* _constraints;
  69 public:
  70   static void init();
  71   static int length() { return (_constraints != NULL) ? _constraints->length() : 0; }
  72   static CommandLineFlagConstraint* at(int i) { return (_constraints != NULL) ? _constraints->at(i) : NULL; }
  73   static CommandLineFlagConstraint* find(const char* name);
  74   static void add(CommandLineFlagConstraint* constraint) { _constraints->append(constraint); }
  75 };
  76 
  77 #endif /* SHARE_VM_RUNTIME_COMMANDLINEFLAGCONSTRAINTLIST_HPP */