1 /*
 2  * Copyright (c) 2016, 2025, 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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24 
25 #ifndef SHARE_VM_CI_CIFLATARRAYKLASS_HPP
26 #define SHARE_VM_CI_CIFLATARRAYKLASS_HPP
27 
28 #include "ci/ciInlineKlass.hpp"
29 #include "ci/ciObjArrayKlass.hpp"
30 #include "oops/flatArrayKlass.hpp"
31 
32 // ciFlatArrayKlass
33 //
34 // This class represents a Klass* in the HotSpot virtual machine
35 // whose Klass part is a FlatArrayKlass.
36 class ciFlatArrayKlass : public ciObjArrayKlass {
37   CI_PACKAGE_ACCESS
38   friend class ciEnv;
39 
40 protected:
41   ciFlatArrayKlass(Klass* k) : ciObjArrayKlass(k) {
42     assert(k->is_flatArray_klass(), "wrong type");
43   }
44 
45   const FlatArrayKlass* get_FlatArrayKlass() const {
46     return FlatArrayKlass::cast(get_Klass());
47   }
48 
49   virtual const char* type_string() override { return "ciFlatArrayKlass"; }
50 
51 public:
52   LayoutKind layout_kind() const { return get_FlatArrayKlass()->layout_kind(); }
53 
54   int log2_element_size() {
55     return Klass::layout_helper_log2_element_size(layout_helper());
56   }
57 
58   int element_byte_size() { return 1 << log2_element_size(); }
59 
60   // What kind of ciObject is this?
61   virtual bool is_flat_array_klass() const override { return true; }
62 
63   virtual ciKlass* exact_klass() override {
64     assert(element_klass()->as_inline_klass()->exact_klass() != nullptr, "must have exact klass");
65     return this;
66   }
67 };
68 
69 #endif // SHARE_VM_CI_CIFLATARRAYKLASS_HPP