1 /*
 2  * Copyright (c) 2016, 2021, 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
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24 
25 #ifndef SHARE_VM_CI_CIFLATARRAYKLASS_HPP
26 #define SHARE_VM_CI_CIFLATARRAYKLASS_HPP
27 
28 #include "ci/ciArrayKlass.hpp"
29 #include "oops/flatArrayKlass.hpp"
30 
31 // ciFlatArrayKlass
32 //
33 // This class represents a Klass* in the HotSpot virtual machine
34 // whose Klass part is a FlatArrayKlass.
35 class ciFlatArrayKlass : public ciArrayKlass {
36   CI_PACKAGE_ACCESS
37   friend class ciEnv;
38 
39 private:
40   ciKlass* _element_klass;
41   ciKlass* _base_element_klass;
42 
43 protected:
44   ciFlatArrayKlass(Klass* h_k);
45 
46   const FlatArrayKlass* get_FlatArrayKlass() const {
47     return FlatArrayKlass::cast(get_Klass());
48   }
49 
50   const char* type_string() { return "ciFlatArrayKlass"; }
51 
52   oop     loader()        { return _base_element_klass->loader(); }
53   jobject loader_handle() { return _base_element_klass->loader_handle(); }
54 
55 public:
56   LayoutKind layout_kind() const { return get_FlatArrayKlass()->layout_kind(); }
57 
58   // The one-level type of the array elements.
59   ciKlass* element_klass();
60 
61   int log2_element_size() {
62     return Klass::layout_helper_log2_element_size(layout_helper());
63   }
64   int element_byte_size() { return 1 << log2_element_size(); }
65 
66   // The innermost type of the array elements.
67   ciKlass* base_element_klass() { return _base_element_klass; }
68 
69   // What kind of ciObject is this?
70   bool is_flat_array_klass() const { return true; }
71 
72   virtual ciKlass* exact_klass();
73 
74   virtual bool can_be_inline_array_klass() {
75     return true;
76   }
77 };
78 
79 
80 #endif // SHARE_VM_CI_CIFLATARRAYKLASS_HPP