1 /*
   2  * Copyright (c) 2017, 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_CI_CIVALUEKLASS_HPP
  26 #define SHARE_VM_CI_CIVALUEKLASS_HPP
  27 
  28 #include "ci/ciConstantPoolCache.hpp"
  29 #include "ci/ciEnv.hpp"
  30 #include "ci/ciFlags.hpp"
  31 #include "ci/ciInstanceKlass.hpp"
  32 #include "ci/ciSymbol.hpp"
  33 #include "oops/valueKlass.hpp"
  34 
  35 // ciValueKlass
  36 //
  37 // Specialized ciInstanceKlass for value types.
  38 class ciValueKlass : public ciInstanceKlass {
  39   CI_PACKAGE_ACCESS
  40 
  41 private:
  42   // Fields declared in the bytecode (without flattened value type fields)
  43   GrowableArray<ciField*>* _declared_nonstatic_fields;
  44 
  45 protected:
  46   ciValueKlass(Klass* h_k) : ciInstanceKlass(h_k), _declared_nonstatic_fields(NULL) {
  47     assert(is_final(), "ValueKlass must be final");
  48   };
  49 
  50   int compute_nonstatic_fields();
  51   const char* type_string() { return "ciValueKlass"; }
  52 
  53 public:
  54   bool is_valuetype() const { return true; }
  55 
  56   int nof_declared_nonstatic_fields() {
  57     if (_declared_nonstatic_fields == NULL) {
  58       compute_nonstatic_fields();
  59     }
  60     return _declared_nonstatic_fields->length();
  61   }
  62 
  63   // ith non-static declared field (presented by ascending address)
  64   ciField* declared_nonstatic_field_at(int i) {
  65     assert(_declared_nonstatic_fields != NULL, "should be initialized");
  66     return _declared_nonstatic_fields->at(i);
  67   }
  68 
  69   // Value type fields
  70   int first_field_offset() const;
  71   int field_index_by_offset(int offset);
  72 
  73   bool flatten_array() const;
  74   bool can_be_returned_as_fields() const;

  75   int value_arg_slots();
  76   int default_value_offset() const;
  77   ciInstance* default_value_instance() const;
  78   bool contains_oops() const;
  79 };
  80 
  81 #endif // SHARE_VM_CI_CIVALUEKLASS_HPP
--- EOF ---