1 /*
2 * Copyright (c) 2015, 2019, 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_CLASSFILE_CLASSLISTPARSER_HPP
26 #define SHARE_CLASSFILE_CLASSLISTPARSER_HPP
27
28 #include "utilities/exceptions.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/growableArray.hpp"
31 #include "utilities/hashtable.inline.hpp"
32
33 class ID2KlassTable : public KVHashtable<int, InstanceKlass*, mtInternal> {
34 public:
35 ID2KlassTable() : KVHashtable<int, InstanceKlass*, mtInternal>(1987) {}
36 };
37
38 class ClassListParser : public StackObj {
39 enum {
40 _unspecified = -999,
41
42 // Max number of bytes allowed per line in the classlist.
43 // Theoretically Java class names could be 65535 bytes in length. Also, an input line
44 // could have a very long path name up to JVM_MAXPATHLEN bytes in length. In reality,
45 // 4K bytes is more than enough.
46 _max_allowed_line_len = 4096,
47 _line_buf_extra = 10, // for detecting input too long
48 _line_buf_size = _max_allowed_line_len + _line_buf_extra
49 };
50
51 static ClassListParser* _instance; // the singleton.
52 const char* _classlist_file;
53 FILE* _file;
54
55 ID2KlassTable _id2klass_table;
56
57 // The following field contains information from the *current* line being
58 // parsed.
59 char _line[_line_buf_size]; // The buffer that holds the current line. Some characters in
60 // the buffer may be overwritten by '\0' during parsing.
61 int _line_len; // Original length of the input line.
62 int _line_no; // Line number for current line being parsed
63 const char* _class_name;
64 int _id;
65 int _super;
66 GrowableArray<int>* _interfaces;
67 bool _interfaces_specified;
68 const char* _source;
69
70 bool parse_int_option(const char* option_name, int* value);
71 InstanceKlass* load_class_from_source(Symbol* class_name, TRAPS);
72 ID2KlassTable *table() {
73 return &_id2klass_table;
74 }
75 InstanceKlass* lookup_class_by_id(int id);
76 void print_specified_interfaces();
77 void print_actual_interfaces(InstanceKlass *ik);
78 public:
79 ClassListParser(const char* file);
80 ~ClassListParser();
81
82 static ClassListParser* instance() {
83 return _instance;
84 }
85 bool parse_one_line();
86 char* _token;
87 void error(const char* msg, ...);
88 void parse_int(int* value);
89 bool try_parse_int(int* value);
90 bool skip_token(const char* option_name);
91 void skip_whitespaces();
92 void skip_non_whitespaces();
93
94 bool is_id_specified() {
95 return _id != _unspecified;
96 }
97 bool is_super_specified() {
98 return _super != _unspecified;
99 }
100 bool are_interfaces_specified() {
101 return _interfaces->length() > 0;
102 }
103 int id() {
104 assert(is_id_specified(), "do not query unspecified id");
105 return _id;
106 }
107 int super() {
108 assert(is_super_specified(), "do not query unspecified super");
109 return _super;
110 }
111 void check_already_loaded(const char* which, int id) {
112 if (_id2klass_table.lookup(id) == NULL) {
113 error("%s id %d is not yet loaded", which, id);
114 }
115 }
116
117 const char* current_class_name() {
118 return _class_name;
119 }
120
121 Klass* load_current_class(TRAPS);
122
123 bool is_loading_from_source();
124
125 // Look up the super or interface of the current class being loaded
126 // (in this->load_current_class()).
127 InstanceKlass* lookup_super_for_current_class(Symbol* super_name);
128 InstanceKlass* lookup_interface_for_current_class(Symbol* interface_name);
129 };
130 #endif // SHARE_CLASSFILE_CLASSLISTPARSER_HPP