1 /*
2 * Copyright (c) 2015, 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 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "runtime/arguments.hpp"
28 #include "runtime/java.hpp"
29 #include "runtime/jniHandles.hpp"
30 #include "services/writeableFlags.hpp"
31
32 // set a boolean global flag
33 int WriteableFlags::set_bool_flag(const char* name, const char* arg, Flag::Flags origin, FormatBuffer<80>& err_msg) {
34 int value = true;
35
36 if (sscanf(arg, "%d", &value)) {
37 return set_bool_flag(name, value != 0, origin, err_msg);
38 }
39 err_msg.print("flag value must be a boolean (1 or 0)");
40 return WRONG_FORMAT;
41 }
42
43 int WriteableFlags::set_bool_flag(const char* name, bool value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
44 return CommandLineFlags::boolAtPut((char*)name, &value, origin) ? SUCCESS : ERR_OTHER;
45 }
46
47 // set a int global flag
48 int WriteableFlags::set_int_flag(const char* name, const char* arg, Flag::Flags origin, FormatBuffer<80>& err_msg) {
49 int value;
50
51 if (sscanf(arg, "%d", &value)) {
52 return set_int_flag(name, value, origin, err_msg);
53 }
54 err_msg.print("flag value must be an integer");
55 return WRONG_FORMAT;
56 }
57
58 int WriteableFlags::set_int_flag(const char* name, int value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
59 return CommandLineFlags::intAtPut((char*)name, &value, origin) ? SUCCESS : ERR_OTHER;
60 }
61
62 // set a uint global flag
63 int WriteableFlags::set_uint_flag(const char* name, const char* arg, Flag::Flags origin, FormatBuffer<80>& err_msg) {
64 uint value;
65
66 if (sscanf(arg, "%u", &value)) {
67 return set_uint_flag(name, value, origin, err_msg);
68 }
69 err_msg.print("flag value must be an unsigned integer");
70 return WRONG_FORMAT;
71 }
72
73 int WriteableFlags::set_uint_flag(const char* name, uint value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
74 return CommandLineFlags::uintAtPut((char*)name, &value, origin) ? SUCCESS : ERR_OTHER;
75 }
76
77 // set a intx global flag
78 int WriteableFlags::set_intx_flag(const char* name, const char* arg, Flag::Flags origin, FormatBuffer<80>& err_msg) {
79 intx value;
80
81 if (sscanf(arg, INTX_FORMAT, &value)) {
82 return set_intx_flag(name, value, origin, err_msg);
83 }
84 err_msg.print("flag value must be an integer");
85 return WRONG_FORMAT;
86 }
87
88 int WriteableFlags::set_intx_flag(const char* name, intx value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
89 return CommandLineFlags::intxAtPut((char*)name, &value, origin) ? SUCCESS : ERR_OTHER;
90 }
91
92 // set a uintx global flag
93 int WriteableFlags::set_uintx_flag(const char* name, const char* arg, Flag::Flags origin, FormatBuffer<80>& err_msg) {
94 uintx value;
95
96 if (sscanf(arg, UINTX_FORMAT, &value)) {
97 return set_uintx_flag(name, value, origin, err_msg);
98 }
99 err_msg.print("flag value must be an unsigned integer");
100 return WRONG_FORMAT;
101 }
102
103 int WriteableFlags::set_uintx_flag(const char* name, uintx value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
104 if (strncmp(name, "MaxHeapFreeRatio", 17) == 0) {
105 if (!Arguments::verify_MaxHeapFreeRatio(err_msg, value)) {
106 return OUT_OF_BOUNDS;
107 }
108 } else if (strncmp(name, "MinHeapFreeRatio", 17) == 0) {
109 if (!Arguments::verify_MinHeapFreeRatio(err_msg, value)) {
110 return OUT_OF_BOUNDS;
111 }
112 }
113 return CommandLineFlags::uintxAtPut((char*)name, &value, origin) ? SUCCESS : ERR_OTHER;
114 }
115
116 // set a uint64_t global flag
117 int WriteableFlags::set_uint64_t_flag(const char* name, const char* arg, Flag::Flags origin, FormatBuffer<80>& err_msg) {
118 uint64_t value;
119
120 if (sscanf(arg, UINT64_FORMAT, &value)) {
121 return set_uint64_t_flag(name, value, origin, err_msg);
122 }
123 err_msg.print("flag value must be an unsigned 64-bit integer");
124 return WRONG_FORMAT;
125 }
126
127 int WriteableFlags::set_uint64_t_flag(const char* name, uint64_t value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
128 return CommandLineFlags::uint64_tAtPut((char*)name, &value, origin) ? SUCCESS : ERR_OTHER;
129 }
130
131 // set a size_t global flag
132 int WriteableFlags::set_size_t_flag(const char* name, const char* arg, Flag::Flags origin, FormatBuffer<80>& err_msg) {
133 size_t value;
134
135 if (sscanf(arg, SIZE_FORMAT, &value)) {
136 return set_size_t_flag(name, value, origin, err_msg);
137 }
138 err_msg.print("flag value must be an unsigned integer");
139 return WRONG_FORMAT;
140 }
141
142 int WriteableFlags::set_size_t_flag(const char* name, size_t value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
143 return CommandLineFlags::size_tAtPut((char*)name, &value, origin) ? SUCCESS : ERR_OTHER;
144 }
145
146 // set a string global flag using value from AttachOperation
147 int WriteableFlags::set_ccstr_flag(const char* name, const char* arg, Flag::Flags origin, FormatBuffer<80>& err_msg) {
148 bool res = CommandLineFlags::ccstrAtPut((char*)name, &arg, origin);
149
150 return res? SUCCESS : ERR_OTHER;
151 }
152
153 /* sets a writeable flag to the provided value
154 *
155 * - return status is one of the WriteableFlags::err enum values
156 * - an eventual error message will be generated to the provided err_msg buffer
157 */
158 int WriteableFlags::set_flag(const char* flag_name, const char* flag_value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
159 return set_flag(flag_name, &flag_value, set_flag_from_char, origin, err_msg);
160 }
161
162 /* sets a writeable flag to the provided value
163 *
164 * - return status is one of the WriteableFlags::err enum values
165 * - an eventual error message will be generated to the provided err_msg buffer
166 */
167 int WriteableFlags::set_flag(const char* flag_name, jvalue flag_value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
168 return set_flag(flag_name, &flag_value, set_flag_from_jvalue, origin, err_msg);
169 }
170
171 // a writeable flag setter accepting either 'jvalue' or 'char *' values
172 int WriteableFlags::set_flag(const char* name, const void* value, int(*setter)(Flag*,const void*,Flag::Flags,FormatBuffer<80>&), Flag::Flags origin, FormatBuffer<80>& err_msg) {
173 if (name == NULL) {
174 err_msg.print("flag name is missing");
175 return MISSING_NAME;
176 }
177 if (value == NULL) {
178 err_msg.print("flag value is missing");
179 return MISSING_VALUE;
180 }
181
182 Flag* f = Flag::find_flag((char*)name, strlen(name));
183 if (f) {
184 // only writeable flags are allowed to be set
185 if (f->is_writeable()) {
186 return setter(f, value, origin, err_msg);
187 } else {
188 err_msg.print("only 'writeable' flags can be set");
189 return NON_WRITABLE;
190 }
191 }
192
193 err_msg.print("flag %s does not exist", name);
194 return INVALID_FLAG;
195 }
196
197 // a writeable flag setter accepting 'char *' values
198 int WriteableFlags::set_flag_from_char(Flag* f, const void* value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
199 char* flag_value = *(char**)value;
200 if (flag_value == NULL) {
201 err_msg.print("flag value is missing");
202 return MISSING_VALUE;
203 }
204 if (f->is_bool()) {
205 return set_bool_flag(f->_name, flag_value, origin, err_msg);
206 } else if (f->is_int()) {
207 return set_int_flag(f->_name, flag_value, origin, err_msg);
208 } else if (f->is_uint()) {
209 return set_uint_flag(f->_name, flag_value, origin, err_msg);
210 } else if (f->is_intx()) {
211 return set_intx_flag(f->_name, flag_value, origin, err_msg);
212 } else if (f->is_uintx()) {
213 return set_uintx_flag(f->_name, flag_value, origin, err_msg);
214 } else if (f->is_uint64_t()) {
215 return set_uint64_t_flag(f->_name, flag_value, origin, err_msg);
216 } else if (f->is_size_t()) {
217 return set_size_t_flag(f->_name, flag_value, origin, err_msg);
218 } else if (f->is_ccstr()) {
219 return set_ccstr_flag(f->_name, flag_value, origin, err_msg);
220 } else {
221 ShouldNotReachHere();
222 }
223 return ERR_OTHER;
224 }
225
226 // a writeable flag setter accepting 'jvalue' values
227 int WriteableFlags::set_flag_from_jvalue(Flag* f, const void* value, Flag::Flags origin, FormatBuffer<80>& err_msg) {
228 jvalue new_value = *(jvalue*)value;
229 if (f->is_bool()) {
230 bool bvalue = (new_value.z == JNI_TRUE ? true : false);
231 return set_bool_flag(f->_name, bvalue, origin, err_msg);
232 } else if (f->is_int()) {
233 int ivalue = (int)new_value.j;
234 return set_int_flag(f->_name, ivalue, origin, err_msg);
235 } else if (f->is_uint()) {
236 uint uvalue = (uint)new_value.j;
237 return set_uint_flag(f->_name, uvalue, origin, err_msg);
238 } else if (f->is_intx()) {
239 intx ivalue = (intx)new_value.j;
240 return set_intx_flag(f->_name, ivalue, origin, err_msg);
241 } else if (f->is_uintx()) {
242 uintx uvalue = (uintx)new_value.j;
243 return set_uintx_flag(f->_name, uvalue, origin, err_msg);
244 } else if (f->is_uint64_t()) {
245 uint64_t uvalue = (uint64_t)new_value.j;
246 return set_uint64_t_flag(f->_name, uvalue, origin, err_msg);
247 } else if (f->is_size_t()) {
248 size_t svalue = (size_t)new_value.j;
249 return set_size_t_flag(f->_name, svalue, origin, err_msg);
250 } else if (f->is_ccstr()) {
251 oop str = JNIHandles::resolve_external_guard(new_value.l);
252 if (str == NULL) {
253 err_msg.print("flag value is missing");
254 return MISSING_VALUE;
255 }
256 ccstr svalue = java_lang_String::as_utf8_string(str);
257 int ret = WriteableFlags::set_ccstr_flag(f->_name, svalue, origin, err_msg);
258 if (ret != SUCCESS) {
259 FREE_C_HEAP_ARRAY(char, svalue);
260 }
261 return ret;
262 } else {
263 ShouldNotReachHere();
264 }
265 return ERR_OTHER;
266 }
267