1 /*
2 * Copyright (c) 2022, 2024, 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.
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23 */
24
25 #ifndef SHARE_CDS_CLASSPRELINKER_HPP
26 #define SHARE_CDS_CLASSPRELINKER_HPP
27
28 #include "interpreter/bytecodes.hpp"
29 #include "oops/oopsHierarchy.hpp"
30 #include "memory/allStatic.hpp"
31 #include "memory/allocation.hpp"
32 #include "runtime/handles.hpp"
33 #include "utilities/exceptions.hpp"
34 #include "utilities/macros.hpp"
35 #include "utilities/resourceHash.hpp"
36
37 class ConstantPool;
38 class constantPoolHandle;
39 class InstanceKlass;
40 class Klass;
41 class SerializeClosure;
42
43 template <typename T> class GrowableArray;
44
45 // ClassPrelinker is used to perform ahead-of-time linking of ConstantPool entries
46 // for archived InstanceKlasses.
47 //
48 // At run time, Java classes are loaded dynamically and may be replaced with JVMTI.
49 // Therefore, we take care to prelink only the ConstantPool entries that are
50 // guatanteed to resolve to the same results at both dump time and run time.
51 //
52 // For example, a JVM_CONSTANT_Class reference to a supertype can be safely resolved
53 // at dump time, because at run time we will load a class from the CDS archive only
54 // if all of its supertypes are loaded from the CDS archive.
55 class ClassPrelinker : AllStatic {
56 class PreloadedKlassRecorder;
57 using ClassesTable = ResourceHashtable<InstanceKlass*, bool, 15889, AnyObj::C_HEAP, mtClassShared> ;
58 static ClassesTable* _processed_classes;
59
60 #ifdef ASSERT
61 template <typename T> static bool is_in_archivebuilder_buffer(T p) {
62 return is_in_archivebuilder_buffer((address)(p));
63 }
64 static bool is_in_archivebuilder_buffer(address p);
65 #endif
66
67 static void resolve_string(constantPoolHandle cp, int cp_index, TRAPS) NOT_CDS_JAVA_HEAP_RETURN;
68 static bool is_class_resolution_deterministic(InstanceKlass* cp_holder, Klass* resolved_class);
69 static bool is_indy_resolution_deterministic(ConstantPool* cp, int cp_index);
70
71 static Klass* find_loaded_class(Thread* current, oop class_loader, Symbol* name);
72 static Klass* find_loaded_class(Thread* current, ConstantPool* cp, int class_cp_index);
73
74 // fmi = FieldRef/MethodRef/InterfaceMethodRef
75 static void maybe_resolve_fmi_ref(InstanceKlass* ik, Method* m, Bytecodes::Code bc, int raw_index,
76 GrowableArray<bool>* resolve_fmi_list, TRAPS);
77 // helper
78 static Klass* resolve_boot_class_or_fail(const char* class_name, TRAPS);
79
80 // java/lang/reflect/Proxy caching
81 static void init_dynamic_proxy_cache(TRAPS);
82
83 public:
84 static void initialize();
85 static void dispose();
86
87 static void preresolve_class_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list);
88 static void preresolve_field_and_method_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list);
89 static void preresolve_indy_cp_entries(JavaThread* current, InstanceKlass* ik, GrowableArray<bool>* preresolve_list);
90
91 // java/lang/Class$ReflectionData caching
92 static int class_reflection_data_flags(InstanceKlass* ik, TRAPS);
93 static void generate_reflection_data(JavaThread* current, InstanceKlass* ik, int rd_flags);
94
95 // java/lang/reflect/Proxy caching
96 static void trace_dynamic_proxy_class(oop loader, const char* proxy_name, objArrayOop interfaces, int access_flags);
97 static void define_dynamic_proxy_class(Handle loader, Handle proxy_name, Handle interfaces, int access_flags, TRAPS);
98
99 // Resolve all constant pool entries that are safe to be stored in the
100 // CDS archive.
101 static void dumptime_resolve_constants(InstanceKlass* ik, TRAPS);
102
103 static bool is_resolution_deterministic(ConstantPool* cp, int cp_index);
104 };
105
106 #endif // SHARE_CDS_CLASSPRELINKER_HPP