1 /*
2 * Copyright (c) 2015, 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_MEMORY_CLASSLISTPARSER_HPP
26 #define SHARE_VM_MEMORY_CLASSLISTPARSER_HPP
27
28 #include "utilities/exceptions.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/hashtable.hpp"
31
32 class CDSClassInfo;
33
34 // Look up from ID -> InstanceKlass*
35 class ID2KlassTable : public Hashtable<InstanceKlass*, mtClass> {
36 public:
37 ID2KlassTable() : Hashtable<InstanceKlass*, mtClass>(1987, sizeof(HashtableEntry<InstanceKlass*, mtClass>)) { }
38 void add(int id, InstanceKlass* klass) {
39 unsigned int hash = (unsigned int)id;
40 HashtableEntry<InstanceKlass*, mtClass>* entry = new_entry(hash, klass);
41 add_entry(hash_to_index(hash), entry);
42 }
43
44 InstanceKlass* lookup(int id) {
45 unsigned int hash = (unsigned int)id;
46 int index = hash_to_index(id);
47 for (HashtableEntry<InstanceKlass*, mtClass>* e = bucket(index); e != NULL; e = e->next()) {
48 if (e->hash() == hash) {
49 return e->literal();
50 }
51 }
52 return NULL;
53 }
54 };
55
56 class ClassListParser : public StackObj {
57 enum {
58 _unspecified = -999,
59
60 // Max number of bytes allowed per line in the classlist.
61 // Theoretically Java class names could be 65535 bytes in length. Also, an input line
62 // could have a very long path name up to JVM_MAXPATHLEN bytes in length. In reality,
63 // 4K bytes is more than enough.
64 _max_allowed_line_len = 4096,
65 _line_buf_extra = 10, // for detecting input too long
66 _line_buf_size = _max_allowed_line_len + _line_buf_extra
67 };
68
69 static ClassListParser* _instance; // the singleton.
70 const char* _classlist_file;
71 FILE* _file;
72
73 ID2KlassTable _id2klass_table;
74
75 // The following field contains information from the *current* line being
76 // parsed.
77 char _line[_line_buf_size]; // The buffer that holds the current line. Some characters in
78 // the buffer may be overwritten by '\0' during parsing.
79 int _line_len; // Original length of the input line.
80 int _line_no; // Line number for current line being parsed
81 const char* _class_name;
82 int _id;
83 int _super;
84 GrowableArray<int>* _interfaces;
85 bool _interfaces_specified;
86 const char* _source;
87
88 bool parse_int_option(const char* option_name, int* value);
89 InstanceKlass* load_class_from_source(Symbol* class_name, TRAPS);
90 ID2KlassTable *table() {
91 return &_id2klass_table;
92 }
93 InstanceKlass* lookup_class_by_id(int id);
94 void print_specified_interfaces();
95 void print_actual_interfaces(InstanceKlass *ik);
96 public:
97 ClassListParser(const char* file);
98 ~ClassListParser();
99
100 static ClassListParser* instance() {
101 return _instance;
102 }
103 bool parse_one_line();
104 char* _token;
105 void error(const char* msg, ...);
106 void parse_int(int* value);
107 bool try_parse_int(int* value);
108 bool skip_token(const char* option_name);
109 void skip_whitespaces();
110 void skip_non_whitespaces();
111
112 bool is_id_specified() {
113 return _id != _unspecified;
114 }
115 bool is_super_specified() {
116 return _super != _unspecified;
117 }
118 bool are_interfaces_specified() {
119 return _interfaces->length() > 0;
120 }
121 int id() {
122 assert(is_id_specified(), "do not query unspecified id");
123 return _id;
124 }
125 int super() {
126 assert(is_super_specified(), "do not query unspecified super");
127 return _super;
128 }
129 void check_already_loaded(const char* which, int id) {
130 if (_id2klass_table.lookup(id) == NULL) {
131 error("%s id %d is not yet loaded", which, id);
132 }
133 }
134
135 const char* current_class_name() {
136 return _class_name;
137 }
138
139 InstanceKlass* load_current_class(TRAPS);
140
141 bool is_loading_from_source();
142
143 // Look up the super or interface of the current class being loaded
144 // (in this->load_current_class()).
145 InstanceKlass* lookup_super_for_current_class(Symbol* super_name);
146 InstanceKlass* lookup_interface_for_current_class(Symbol* interface_name);
147 };
148 #endif