1 /*
2 * Copyright (c) 1997, 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 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/gcArguments.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "logging/logStream.hpp"
39 #include "logging/logTag.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/universe.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/vm_version.hpp"
54 #include "services/management.hpp"
55 #include "services/memTracker.hpp"
56 #include "utilities/align.hpp"
57 #include "utilities/defaultStream.hpp"
58 #include "utilities/macros.hpp"
59 #include "utilities/stringUtils.hpp"
60 #if INCLUDE_JVMCI
61 #include "jvmci/jvmciRuntime.hpp"
62 #endif
63
64 // Note: This is a special bug reporting site for the JVM
65 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
66 #define DEFAULT_JAVA_LAUNCHER "generic"
67
68 char* Arguments::_jvm_flags_file = NULL;
69 char** Arguments::_jvm_flags_array = NULL;
70 int Arguments::_num_jvm_flags = 0;
71 char** Arguments::_jvm_args_array = NULL;
72 int Arguments::_num_jvm_args = 0;
73 char* Arguments::_java_command = NULL;
74 SystemProperty* Arguments::_system_properties = NULL;
75 const char* Arguments::_gc_log_filename = NULL;
76 size_t Arguments::_conservative_max_heap_alignment = 0;
77 size_t Arguments::_min_heap_size = 0;
78 Arguments::Mode Arguments::_mode = _mixed;
79 bool Arguments::_java_compiler = false;
80 bool Arguments::_xdebug_mode = false;
81 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
82 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
83 int Arguments::_sun_java_launcher_pid = -1;
84 bool Arguments::_sun_java_launcher_is_altjvm = false;
85
86 // These parameters are reset in method parse_vm_init_args()
87 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
88 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
89 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
90 bool Arguments::_ClipInlining = ClipInlining;
91 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
92 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
93
94 char* Arguments::SharedArchivePath = NULL;
95
96 AgentLibraryList Arguments::_libraryList;
97 AgentLibraryList Arguments::_agentList;
98
99 abort_hook_t Arguments::_abort_hook = NULL;
100 exit_hook_t Arguments::_exit_hook = NULL;
101 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
102
103
104 SystemProperty *Arguments::_sun_boot_library_path = NULL;
105 SystemProperty *Arguments::_java_library_path = NULL;
106 SystemProperty *Arguments::_java_home = NULL;
107 SystemProperty *Arguments::_java_class_path = NULL;
108 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
109
110 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
111 PathString *Arguments::_system_boot_class_path = NULL;
112 bool Arguments::_has_jimage = false;
113
114 char* Arguments::_ext_dirs = NULL;
115
116 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
117 // part of the option string.
118 static bool match_option(const JavaVMOption *option, const char* name,
119 const char** tail) {
120 size_t len = strlen(name);
121 if (strncmp(option->optionString, name, len) == 0) {
122 *tail = option->optionString + len;
123 return true;
124 } else {
125 return false;
126 }
127 }
128
129 // Check if 'option' matches 'name'. No "tail" is allowed.
130 static bool match_option(const JavaVMOption *option, const char* name) {
131 const char* tail = NULL;
132 bool result = match_option(option, name, &tail);
133 if (tail != NULL && *tail == '\0') {
134 return result;
135 } else {
136 return false;
137 }
138 }
139
140 // Return true if any of the strings in null-terminated array 'names' matches.
141 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
142 // the option must match exactly.
143 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
144 bool tail_allowed) {
145 for (/* empty */; *names != NULL; ++names) {
146 if (match_option(option, *names, tail)) {
147 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
148 return true;
149 }
150 }
151 }
152 return false;
153 }
154
155 static void logOption(const char* opt) {
156 if (PrintVMOptions) {
157 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
158 }
159 }
160
161 bool needs_module_property_warning = false;
162
163 #define MODULE_PROPERTY_PREFIX "jdk.module."
164 #define MODULE_PROPERTY_PREFIX_LEN 11
165 #define ADDEXPORTS "addexports"
166 #define ADDEXPORTS_LEN 10
167 #define ADDREADS "addreads"
168 #define ADDREADS_LEN 8
169 #define ADDOPENS "addopens"
170 #define ADDOPENS_LEN 8
171 #define PATCH "patch"
172 #define PATCH_LEN 5
173 #define ADDMODS "addmods"
174 #define ADDMODS_LEN 7
175 #define LIMITMODS "limitmods"
176 #define LIMITMODS_LEN 9
177 #define PATH "path"
178 #define PATH_LEN 4
179 #define UPGRADE_PATH "upgrade.path"
180 #define UPGRADE_PATH_LEN 12
181
182 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
183 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
184 return ((strncmp(option, property, len) == 0) &&
185 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
186 }
187
188 // Return true if property starts with "jdk.module." and its ensuing chars match
189 // any of the reserved module properties.
190 // property should be passed without the leading "-D".
191 bool Arguments::is_internal_module_property(const char* property) {
192 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
193 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
194 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
195 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
196 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
197 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
198 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
199 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
200 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
201 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
202 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
203 return true;
204 }
205 }
206 return false;
207 }
208
209 // Process java launcher properties.
210 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
211 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
212 // sun.java.launcher.pid is defined.
213 // Must do this before setting up other system properties,
214 // as some of them may depend on launcher type.
215 for (int index = 0; index < args->nOptions; index++) {
216 const JavaVMOption* option = args->options + index;
217 const char* tail;
218
219 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
220 process_java_launcher_argument(tail, option->extraInfo);
221 continue;
222 }
223 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
224 if (strcmp(tail, "true") == 0) {
225 _sun_java_launcher_is_altjvm = true;
226 }
227 continue;
228 }
229 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
230 _sun_java_launcher_pid = atoi(tail);
231 continue;
232 }
233 }
234 }
235
236 // Initialize system properties key and value.
237 void Arguments::init_system_properties() {
238
239 // Set up _system_boot_class_path which is not a property but
240 // relies heavily on argument processing and the jdk.boot.class.path.append
241 // property. It is used to store the underlying system boot class path.
242 _system_boot_class_path = new PathString(NULL);
243
244 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
245 "Java Virtual Machine Specification", false));
246 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
247 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
249 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
250
251 // Following are JVMTI agent writable properties.
252 // Properties values are set to NULL and they are
253 // os specific they are initialized in os::init_system_properties_values().
254 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
255 _java_library_path = new SystemProperty("java.library.path", NULL, true);
256 _java_home = new SystemProperty("java.home", NULL, true);
257 _java_class_path = new SystemProperty("java.class.path", "", true);
258 // jdk.boot.class.path.append is a non-writeable, internal property.
259 // It can only be set by either:
260 // - -Xbootclasspath/a:
261 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
262 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
263
264 // Add to System Property list.
265 PropertyList_add(&_system_properties, _sun_boot_library_path);
266 PropertyList_add(&_system_properties, _java_library_path);
267 PropertyList_add(&_system_properties, _java_home);
268 PropertyList_add(&_system_properties, _java_class_path);
269 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
270
271 // Set OS specific system properties values
272 os::init_system_properties_values();
273 }
274
275 // Update/Initialize System properties after JDK version number is known
276 void Arguments::init_version_specific_system_properties() {
277 enum { bufsz = 16 };
278 char buffer[bufsz];
279 const char* spec_vendor = "Oracle Corporation";
280 uint32_t spec_version = JDK_Version::current().major_version();
281
282 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
283
284 PropertyList_add(&_system_properties,
285 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
286 PropertyList_add(&_system_properties,
287 new SystemProperty("java.vm.specification.version", buffer, false));
288 PropertyList_add(&_system_properties,
289 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
290 }
291
292 /*
293 * -XX argument processing:
294 *
295 * -XX arguments are defined in several places, such as:
296 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
297 * -XX arguments are parsed in parse_argument().
298 * -XX argument bounds checking is done in check_vm_args_consistency().
299 *
300 * Over time -XX arguments may change. There are mechanisms to handle common cases:
301 *
302 * ALIASED: An option that is simply another name for another option. This is often
303 * part of the process of deprecating a flag, but not all aliases need
304 * to be deprecated.
305 *
306 * Create an alias for an option by adding the old and new option names to the
307 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
308 *
309 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
310 * support may be removed in the future. Both regular and aliased options may be
311 * deprecated.
312 *
313 * Add a deprecation warning for an option (or alias) by adding an entry in the
314 * "special_jvm_flags" table and setting the "deprecated_in" field.
315 * Often an option "deprecated" in one major release will
316 * be made "obsolete" in the next. In this case the entry should also have its
317 * "obsolete_in" field set.
318 *
319 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
320 * on the command line. A warning is printed to let the user know that option might not
321 * be accepted in the future.
322 *
323 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
324 * table and setting the "obsolete_in" field.
325 *
326 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
327 * to the current JDK version. The system will flatly refuse to admit the existence of
328 * the flag. This allows a flag to die automatically over JDK releases.
329 *
330 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
331 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
332 * - Newly obsolete or expired deprecated options should have their global variable
333 * definitions removed (from globals.hpp, etc) and related implementations removed.
334 *
335 * Recommended approach for removing options:
336 *
337 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
338 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
339 *
340 * To remove internal options (e.g. diagnostic, experimental, develop options), use
341 * a 2-step model adding major release numbers to the obsolete and expire columns.
342 *
343 * To change the name of an option, use the alias table as well as a 2-step
344 * model adding major release numbers to the deprecate and expire columns.
345 * Think twice about aliasing commonly used customer options.
346 *
347 * There are times when it is appropriate to leave a future release number as undefined.
348 *
349 * Tests: Aliases should be tested in VMAliasOptions.java.
350 * Deprecated options should be tested in VMDeprecatedOptions.java.
351 */
352
353 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
354 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
355 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
356 // the command-line as usual, but will issue a warning.
357 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
358 // the command-line, while issuing a warning and ignoring the flag value.
359 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
360 // existence of the flag.
361 //
362 // MANUAL CLEANUP ON JDK VERSION UPDATES:
363 // This table ensures that the handling of options will update automatically when the JDK
364 // version is incremented, but the source code needs to be cleanup up manually:
365 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
366 // variable should be removed, as well as users of the variable.
367 // - As "deprecated" options age into "obsolete" options, move the entry into the
368 // "Obsolete Flags" section of the table.
369 // - All expired options should be removed from the table.
370 static SpecialFlag const special_jvm_flags[] = {
371 // -------------- Deprecated Flags --------------
372 // --- Non-alias flags - sorted by obsolete_in then expired_in:
373 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
374 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
375 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
376 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
377 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
378 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
379 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
380 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
381
382 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
383 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
384 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
385 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
386 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
387
388 // -------------- Obsolete Flags - sorted by expired_in --------------
389 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
390 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
391 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
392 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
393 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
394
395 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
396 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
397 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
398 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
399 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
400 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
401 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
402 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
403 #endif
404
405 { NULL, JDK_Version(0), JDK_Version(0) }
406 };
407
408 // Flags that are aliases for other flags.
409 typedef struct {
410 const char* alias_name;
411 const char* real_name;
412 } AliasedFlag;
413
414 static AliasedFlag const aliased_jvm_flags[] = {
415 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
416 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
417 { NULL, NULL}
418 };
419
420 // NOTE: A compatibility request will be necessary for each alias to be removed.
421 static AliasedLoggingFlag const aliased_logging_flags[] = {
422 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
423 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
424 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
425 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
426 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
427 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
428 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
429 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
430 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
431 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
432 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
433 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
434 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
435 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
436 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
437 };
438
439 #ifndef PRODUCT
440 // These options are removed in jdk9. Remove this code for jdk10.
441 static AliasedFlag const removed_develop_logging_flags[] = {
442 { "TraceClassInitialization", "-Xlog:class+init" },
443 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
444 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
445 { "TraceItables", "-Xlog:itables=debug" },
446 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
447 { "TraceSafepoint", "-Xlog:safepoint=debug" },
448 { "TraceStartupTime", "-Xlog:startuptime" },
449 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
450 { "PrintVtables", "-Xlog:vtables=debug" },
451 { "VerboseVerification", "-Xlog:verification" },
452 { NULL, NULL }
453 };
454 #endif //PRODUCT
455
456 // Return true if "v" is less than "other", where "other" may be "undefined".
457 static bool version_less_than(JDK_Version v, JDK_Version other) {
458 assert(!v.is_undefined(), "must be defined");
459 if (!other.is_undefined() && v.compare(other) >= 0) {
460 return false;
461 } else {
462 return true;
463 }
464 }
465
466 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
467
468 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
469 // Allow extensions to have priority
470 if (lookup_special_flag_ext(flag_name, flag)) {
471 return true;
472 }
473
474 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
475 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
476 flag = special_jvm_flags[i];
477 return true;
478 }
479 }
480 return false;
481 }
482
483 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
484 assert(version != NULL, "Must provide a version buffer");
485 SpecialFlag flag;
486 if (lookup_special_flag(flag_name, flag)) {
487 if (!flag.obsolete_in.is_undefined()) {
488 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
489 *version = flag.obsolete_in;
490 return true;
491 }
492 }
493 }
494 return false;
495 }
496
497 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
498 assert(version != NULL, "Must provide a version buffer");
499 SpecialFlag flag;
500 if (lookup_special_flag(flag_name, flag)) {
501 if (!flag.deprecated_in.is_undefined()) {
502 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
503 version_less_than(JDK_Version::current(), flag.expired_in)) {
504 *version = flag.deprecated_in;
505 return 1;
506 } else {
507 return -1;
508 }
509 }
510 }
511 return 0;
512 }
513
514 #ifndef PRODUCT
515 const char* Arguments::removed_develop_logging_flag_name(const char* name){
516 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
517 const AliasedFlag& flag = removed_develop_logging_flags[i];
518 if (strcmp(flag.alias_name, name) == 0) {
519 return flag.real_name;
520 }
521 }
522 return NULL;
523 }
524 #endif // PRODUCT
525
526 const char* Arguments::real_flag_name(const char *flag_name) {
527 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
528 const AliasedFlag& flag_status = aliased_jvm_flags[i];
529 if (strcmp(flag_status.alias_name, flag_name) == 0) {
530 return flag_status.real_name;
531 }
532 }
533 return flag_name;
534 }
535
536 #ifdef ASSERT
537 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
538 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
539 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
540 return true;
541 }
542 }
543 return false;
544 }
545
546 static bool verify_special_jvm_flags() {
547 bool success = true;
548 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
549 const SpecialFlag& flag = special_jvm_flags[i];
550 if (lookup_special_flag(flag.name, i)) {
551 warning("Duplicate special flag declaration \"%s\"", flag.name);
552 success = false;
553 }
554 if (flag.deprecated_in.is_undefined() &&
555 flag.obsolete_in.is_undefined()) {
556 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
557 success = false;
558 }
559
560 if (!flag.deprecated_in.is_undefined()) {
561 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
562 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
563 success = false;
564 }
565
566 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
567 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
568 success = false;
569 }
570 }
571
572 if (!flag.obsolete_in.is_undefined()) {
573 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
574 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
575 success = false;
576 }
577
578 // if flag has become obsolete it should not have a "globals" flag defined anymore.
579 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
580 if (Flag::find_flag(flag.name) != NULL) {
581 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
582 success = false;
583 }
584 }
585 }
586
587 if (!flag.expired_in.is_undefined()) {
588 // if flag has become expired it should not have a "globals" flag defined anymore.
589 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
590 if (Flag::find_flag(flag.name) != NULL) {
591 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
592 success = false;
593 }
594 }
595 }
596
597 }
598 return success;
599 }
600 #endif
601
602 // Parses a size specification string.
603 bool Arguments::atojulong(const char *s, julong* result) {
604 julong n = 0;
605
606 // First char must be a digit. Don't allow negative numbers or leading spaces.
607 if (!isdigit(*s)) {
608 return false;
609 }
610
611 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
612 char* remainder;
613 errno = 0;
614 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
615 if (errno != 0) {
616 return false;
617 }
618
619 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
620 if (remainder == s || strlen(remainder) > 1) {
621 return false;
622 }
623
624 switch (*remainder) {
625 case 'T': case 't':
626 *result = n * G * K;
627 // Check for overflow.
628 if (*result/((julong)G * K) != n) return false;
629 return true;
630 case 'G': case 'g':
631 *result = n * G;
632 if (*result/G != n) return false;
633 return true;
634 case 'M': case 'm':
635 *result = n * M;
636 if (*result/M != n) return false;
637 return true;
638 case 'K': case 'k':
639 *result = n * K;
640 if (*result/K != n) return false;
641 return true;
642 case '\0':
643 *result = n;
644 return true;
645 default:
646 return false;
647 }
648 }
649
650 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
651 if (size < min_size) return arg_too_small;
652 if (size > max_size) return arg_too_big;
653 return arg_in_range;
654 }
655
656 // Describe an argument out of range error
657 void Arguments::describe_range_error(ArgsRange errcode) {
658 switch(errcode) {
659 case arg_too_big:
660 jio_fprintf(defaultStream::error_stream(),
661 "The specified size exceeds the maximum "
662 "representable size.\n");
663 break;
664 case arg_too_small:
665 case arg_unreadable:
666 case arg_in_range:
667 // do nothing for now
668 break;
669 default:
670 ShouldNotReachHere();
671 }
672 }
673
674 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
675 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
676 return true;
677 } else {
678 return false;
679 }
680 }
681
682 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
683 char* end;
684 errno = 0;
685 double v = strtod(value, &end);
686 if ((errno != 0) || (*end != 0)) {
687 return false;
688 }
689
690 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
691 return true;
692 }
693 return false;
694 }
695
696 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
697 julong v;
698 int int_v;
699 intx intx_v;
700 bool is_neg = false;
701 Flag* result = Flag::find_flag(name, strlen(name));
702
703 if (result == NULL) {
704 return false;
705 }
706
707 // Check the sign first since atojulong() parses only unsigned values.
708 if (*value == '-') {
709 if (!result->is_intx() && !result->is_int()) {
710 return false;
711 }
712 value++;
713 is_neg = true;
714 }
715 if (!Arguments::atojulong(value, &v)) {
716 return false;
717 }
718 if (result->is_int()) {
719 int_v = (int) v;
720 if (is_neg) {
721 int_v = -int_v;
722 }
723 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
724 } else if (result->is_uint()) {
725 uint uint_v = (uint) v;
726 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
727 } else if (result->is_intx()) {
728 intx_v = (intx) v;
729 if (is_neg) {
730 intx_v = -intx_v;
731 }
732 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
733 } else if (result->is_uintx()) {
734 uintx uintx_v = (uintx) v;
735 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
736 } else if (result->is_uint64_t()) {
737 uint64_t uint64_t_v = (uint64_t) v;
738 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
739 } else if (result->is_size_t()) {
740 size_t size_t_v = (size_t) v;
741 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
742 } else if (result->is_double()) {
743 double double_v = (double) v;
744 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
745 } else {
746 return false;
747 }
748 }
749
750 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
751 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
752 // Contract: CommandLineFlags always returns a pointer that needs freeing.
753 FREE_C_HEAP_ARRAY(char, value);
754 return true;
755 }
756
757 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
758 const char* old_value = "";
759 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
760 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
761 size_t new_len = strlen(new_value);
762 const char* value;
763 char* free_this_too = NULL;
764 if (old_len == 0) {
765 value = new_value;
766 } else if (new_len == 0) {
767 value = old_value;
768 } else {
769 size_t length = old_len + 1 + new_len + 1;
770 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
771 // each new setting adds another LINE to the switch:
772 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
773 value = buf;
774 free_this_too = buf;
775 }
776 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
777 // CommandLineFlags always returns a pointer that needs freeing.
778 FREE_C_HEAP_ARRAY(char, value);
779 if (free_this_too != NULL) {
780 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
781 FREE_C_HEAP_ARRAY(char, free_this_too);
782 }
783 return true;
784 }
785
786 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
787 const char* real_name = real_flag_name(arg);
788 JDK_Version since = JDK_Version();
789 switch (is_deprecated_flag(arg, &since)) {
790 case -1:
791 return NULL; // obsolete or expired, don't process normally
792 case 0:
793 return real_name;
794 case 1: {
795 if (warn) {
796 char version[256];
797 since.to_string(version, sizeof(version));
798 if (real_name != arg) {
799 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
800 arg, version, real_name);
801 } else {
802 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
803 arg, version);
804 }
805 }
806 return real_name;
807 }
808 }
809 ShouldNotReachHere();
810 return NULL;
811 }
812
813 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
814 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
815 // Set tagset string buffer at max size of 256, large enough for any alias tagset
816 const int max_tagset_size = 256;
817 int max_tagset_len = max_tagset_size - 1;
818 char tagset_buffer[max_tagset_size];
819 tagset_buffer[0] = '\0';
820
821 // Write tag-set for aliased logging option, in string list form
822 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
823 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
824 if (i > 0) {
825 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
826 }
827 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
828 }
829 if (!alf.exactMatch) {
830 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
831 }
832 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
833 (on) ? "+" : "-",
834 name,
835 tagset_buffer,
836 (on) ? LogLevel::name(alf.level) : "off");
837 }
838
839 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
840 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
841 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
842 if (strcmp(alf.alias_name, name) == 0) {
843 log_deprecated_flag(name, on, alf);
844 return alf;
845 }
846 }
847 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
848 return a;
849 }
850
851 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
852
853 // range of acceptable characters spelled out for portability reasons
854 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
855 #define BUFLEN 255
856 char name[BUFLEN+1];
857 char dummy;
858 const char* real_name;
859 bool warn_if_deprecated = true;
860
861 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
862 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
863 if (alf.alias_name != NULL){
864 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
865 return true;
866 }
867 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
868 if (real_name == NULL) {
869 return false;
870 }
871 return set_bool_flag(real_name, false, origin);
872 }
873 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
874 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
875 if (alf.alias_name != NULL){
876 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
877 return true;
878 }
879 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
880 if (real_name == NULL) {
881 return false;
882 }
883 return set_bool_flag(real_name, true, origin);
884 }
885
886 char punct;
887 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
888 const char* value = strchr(arg, '=') + 1;
889 Flag* flag;
890
891 // this scanf pattern matches both strings (handled here) and numbers (handled later))
892 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
893 if (alf.alias_name != NULL) {
894 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
895 return true;
896 }
897 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
898 if (real_name == NULL) {
899 return false;
900 }
901 flag = Flag::find_flag(real_name);
902 if (flag != NULL && flag->is_ccstr()) {
903 if (flag->ccstr_accumulates()) {
904 return append_to_string_flag(real_name, value, origin);
905 } else {
906 if (value[0] == '\0') {
907 value = NULL;
908 }
909 return set_string_flag(real_name, value, origin);
910 }
911 } else {
912 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
913 }
914 }
915
916 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
917 const char* value = strchr(arg, '=') + 1;
918 // -XX:Foo:=xxx will reset the string flag to the given value.
919 if (value[0] == '\0') {
920 value = NULL;
921 }
922 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
923 if (real_name == NULL) {
924 return false;
925 }
926 return set_string_flag(real_name, value, origin);
927 }
928
929 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
930 #define SIGNED_NUMBER_RANGE "[-0123456789]"
931 #define NUMBER_RANGE "[0123456789eE+-]"
932 char value[BUFLEN + 1];
933 char value2[BUFLEN + 1];
934 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
935 // Looks like a floating-point number -- try again with more lenient format string
936 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
937 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
938 if (real_name == NULL) {
939 return false;
940 }
941 return set_fp_numeric_flag(real_name, value, origin);
942 }
943 }
944
945 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
946 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
947 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
948 if (real_name == NULL) {
949 return false;
950 }
951 return set_numeric_flag(real_name, value, origin);
952 }
953
954 return false;
955 }
956
957 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
958 assert(bldarray != NULL, "illegal argument");
959
960 if (arg == NULL) {
961 return;
962 }
963
964 int new_count = *count + 1;
965
966 // expand the array and add arg to the last element
967 if (*bldarray == NULL) {
968 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
969 } else {
970 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
971 }
972 (*bldarray)[*count] = os::strdup_check_oom(arg);
973 *count = new_count;
974 }
975
976 void Arguments::build_jvm_args(const char* arg) {
977 add_string(&_jvm_args_array, &_num_jvm_args, arg);
978 }
979
980 void Arguments::build_jvm_flags(const char* arg) {
981 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
982 }
983
984 // utility function to return a string that concatenates all
985 // strings in a given char** array
986 const char* Arguments::build_resource_string(char** args, int count) {
987 if (args == NULL || count == 0) {
988 return NULL;
989 }
990 size_t length = 0;
991 for (int i = 0; i < count; i++) {
992 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
993 }
994 char* s = NEW_RESOURCE_ARRAY(char, length);
995 char* dst = s;
996 for (int j = 0; j < count; j++) {
997 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
998 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
999 dst += offset;
1000 length -= offset;
1001 }
1002 return (const char*) s;
1003 }
1004
1005 void Arguments::print_on(outputStream* st) {
1006 st->print_cr("VM Arguments:");
1007 if (num_jvm_flags() > 0) {
1008 st->print("jvm_flags: "); print_jvm_flags_on(st);
1009 st->cr();
1010 }
1011 if (num_jvm_args() > 0) {
1012 st->print("jvm_args: "); print_jvm_args_on(st);
1013 st->cr();
1014 }
1015 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1016 if (_java_class_path != NULL) {
1017 char* path = _java_class_path->value();
1018 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1019 }
1020 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1021 }
1022
1023 void Arguments::print_summary_on(outputStream* st) {
1024 // Print the command line. Environment variables that are helpful for
1025 // reproducing the problem are written later in the hs_err file.
1026 // flags are from setting file
1027 if (num_jvm_flags() > 0) {
1028 st->print_raw("Settings File: ");
1029 print_jvm_flags_on(st);
1030 st->cr();
1031 }
1032 // args are the command line and environment variable arguments.
1033 st->print_raw("Command Line: ");
1034 if (num_jvm_args() > 0) {
1035 print_jvm_args_on(st);
1036 }
1037 // this is the classfile and any arguments to the java program
1038 if (java_command() != NULL) {
1039 st->print("%s", java_command());
1040 }
1041 st->cr();
1042 }
1043
1044 void Arguments::print_jvm_flags_on(outputStream* st) {
1045 if (_num_jvm_flags > 0) {
1046 for (int i=0; i < _num_jvm_flags; i++) {
1047 st->print("%s ", _jvm_flags_array[i]);
1048 }
1049 }
1050 }
1051
1052 void Arguments::print_jvm_args_on(outputStream* st) {
1053 if (_num_jvm_args > 0) {
1054 for (int i=0; i < _num_jvm_args; i++) {
1055 st->print("%s ", _jvm_args_array[i]);
1056 }
1057 }
1058 }
1059
1060 bool Arguments::process_argument(const char* arg,
1061 jboolean ignore_unrecognized,
1062 Flag::Flags origin) {
1063 JDK_Version since = JDK_Version();
1064
1065 if (parse_argument(arg, origin)) {
1066 return true;
1067 }
1068
1069 // Determine if the flag has '+', '-', or '=' characters.
1070 bool has_plus_minus = (*arg == '+' || *arg == '-');
1071 const char* const argname = has_plus_minus ? arg + 1 : arg;
1072
1073 size_t arg_len;
1074 const char* equal_sign = strchr(argname, '=');
1075 if (equal_sign == NULL) {
1076 arg_len = strlen(argname);
1077 } else {
1078 arg_len = equal_sign - argname;
1079 }
1080
1081 // Only make the obsolete check for valid arguments.
1082 if (arg_len <= BUFLEN) {
1083 // Construct a string which consists only of the argument name without '+', '-', or '='.
1084 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1085 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1086 if (is_obsolete_flag(stripped_argname, &since)) {
1087 char version[256];
1088 since.to_string(version, sizeof(version));
1089 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1090 return true;
1091 }
1092 #ifndef PRODUCT
1093 else {
1094 const char* replacement;
1095 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1096 log_warning(arguments)("%s has been removed. Please use %s instead.",
1097 stripped_argname,
1098 replacement);
1099 return false;
1100 }
1101 }
1102 #endif //PRODUCT
1103 }
1104
1105 // For locked flags, report a custom error message if available.
1106 // Otherwise, report the standard unrecognized VM option.
1107 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1108 if (found_flag != NULL) {
1109 char locked_message_buf[BUFLEN];
1110 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1111 if (strlen(locked_message_buf) == 0) {
1112 if (found_flag->is_bool() && !has_plus_minus) {
1113 jio_fprintf(defaultStream::error_stream(),
1114 "Missing +/- setting for VM option '%s'\n", argname);
1115 } else if (!found_flag->is_bool() && has_plus_minus) {
1116 jio_fprintf(defaultStream::error_stream(),
1117 "Unexpected +/- setting in VM option '%s'\n", argname);
1118 } else {
1119 jio_fprintf(defaultStream::error_stream(),
1120 "Improperly specified VM option '%s'\n", argname);
1121 }
1122 } else {
1123 #ifdef PRODUCT
1124 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1125 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1126 if (ignore_unrecognized && mismatched) {
1127 return true;
1128 }
1129 #endif
1130 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1131 }
1132 } else {
1133 if (ignore_unrecognized) {
1134 return true;
1135 }
1136 jio_fprintf(defaultStream::error_stream(),
1137 "Unrecognized VM option '%s'\n", argname);
1138 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1139 if (fuzzy_matched != NULL) {
1140 jio_fprintf(defaultStream::error_stream(),
1141 "Did you mean '%s%s%s'? ",
1142 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1143 fuzzy_matched->_name,
1144 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1145 }
1146 }
1147
1148 // allow for commandline "commenting out" options like -XX:#+Verbose
1149 return arg[0] == '#';
1150 }
1151
1152 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1153 FILE* stream = fopen(file_name, "rb");
1154 if (stream == NULL) {
1155 if (should_exist) {
1156 jio_fprintf(defaultStream::error_stream(),
1157 "Could not open settings file %s\n", file_name);
1158 return false;
1159 } else {
1160 return true;
1161 }
1162 }
1163
1164 char token[1024];
1165 int pos = 0;
1166
1167 bool in_white_space = true;
1168 bool in_comment = false;
1169 bool in_quote = false;
1170 char quote_c = 0;
1171 bool result = true;
1172
1173 int c = getc(stream);
1174 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1175 if (in_white_space) {
1176 if (in_comment) {
1177 if (c == '\n') in_comment = false;
1178 } else {
1179 if (c == '#') in_comment = true;
1180 else if (!isspace(c)) {
1181 in_white_space = false;
1182 token[pos++] = c;
1183 }
1184 }
1185 } else {
1186 if (c == '\n' || (!in_quote && isspace(c))) {
1187 // token ends at newline, or at unquoted whitespace
1188 // this allows a way to include spaces in string-valued options
1189 token[pos] = '\0';
1190 logOption(token);
1191 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1192 build_jvm_flags(token);
1193 pos = 0;
1194 in_white_space = true;
1195 in_quote = false;
1196 } else if (!in_quote && (c == '\'' || c == '"')) {
1197 in_quote = true;
1198 quote_c = c;
1199 } else if (in_quote && (c == quote_c)) {
1200 in_quote = false;
1201 } else {
1202 token[pos++] = c;
1203 }
1204 }
1205 c = getc(stream);
1206 }
1207 if (pos > 0) {
1208 token[pos] = '\0';
1209 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1210 build_jvm_flags(token);
1211 }
1212 fclose(stream);
1213 return result;
1214 }
1215
1216 //=============================================================================================================
1217 // Parsing of properties (-D)
1218
1219 const char* Arguments::get_property(const char* key) {
1220 return PropertyList_get_value(system_properties(), key);
1221 }
1222
1223 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1224 const char* eq = strchr(prop, '=');
1225 const char* key;
1226 const char* value = "";
1227
1228 if (eq == NULL) {
1229 // property doesn't have a value, thus use passed string
1230 key = prop;
1231 } else {
1232 // property have a value, thus extract it and save to the
1233 // allocated string
1234 size_t key_len = eq - prop;
1235 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1236
1237 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1238 key = tmp_key;
1239
1240 value = &prop[key_len + 1];
1241 }
1242
1243 if (strcmp(key, "java.compiler") == 0) {
1244 process_java_compiler_argument(value);
1245 // Record value in Arguments, but let it get passed to Java.
1246 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1247 strcmp(key, "sun.java.launcher.pid") == 0) {
1248 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1249 // private and are processed in process_sun_java_launcher_properties();
1250 // the sun.java.launcher property is passed on to the java application
1251 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1252 // append is true, writable is true, internal is false
1253 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1254 WriteableProperty, ExternalProperty);
1255 } else {
1256 if (strcmp(key, "sun.java.command") == 0) {
1257 char *old_java_command = _java_command;
1258 _java_command = os::strdup_check_oom(value, mtArguments);
1259 if (old_java_command != NULL) {
1260 os::free(old_java_command);
1261 }
1262 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1263 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1264 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1265 // its value without going through the property list or making a Java call.
1266 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1267 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1268 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1269 os::free((void *)old_java_vendor_url_bug);
1270 }
1271 }
1272
1273 // Create new property and add at the end of the list
1274 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1275 }
1276
1277 if (key != prop) {
1278 // SystemProperty copy passed value, thus free previously allocated
1279 // memory
1280 FreeHeap((void *)key);
1281 }
1282
1283 return true;
1284 }
1285
1286 #if INCLUDE_CDS
1287 void Arguments::check_unsupported_dumping_properties() {
1288 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1289 const char* unsupported_properties[] = { "jdk.module.main",
1290 "jdk.module.limitmods",
1291 "jdk.module.path",
1292 "jdk.module.upgrade.path",
1293 "jdk.module.patch.0" };
1294 const char* unsupported_options[] = { "-m", // cannot use at dump time
1295 "--limit-modules", // ignored at dump time
1296 "--module-path", // ignored at dump time
1297 "--upgrade-module-path", // ignored at dump time
1298 "--patch-module" // ignored at dump time
1299 };
1300 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1301 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1302 // vm will exit with an error message. Otherwise, it will print an informational message if
1303 // -Xlog:cds is enabled.
1304 uint info_idx = 1;
1305 SystemProperty* sp = system_properties();
1306 while (sp != NULL) {
1307 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1308 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1309 if (i < info_idx) {
1310 vm_exit_during_initialization(
1311 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1312 } else {
1313 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1314 unsupported_options[i]);
1315 }
1316 }
1317 }
1318 sp = sp->next();
1319 }
1320
1321 // Check for an exploded module build in use with -Xshare:dump.
1322 if (!has_jimage()) {
1323 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1324 }
1325 }
1326 #endif
1327
1328 //===========================================================================================================
1329 // Setting int/mixed/comp mode flags
1330
1331 void Arguments::set_mode_flags(Mode mode) {
1332 // Set up default values for all flags.
1333 // If you add a flag to any of the branches below,
1334 // add a default value for it here.
1335 set_java_compiler(false);
1336 _mode = mode;
1337
1338 // Ensure Agent_OnLoad has the correct initial values.
1339 // This may not be the final mode; mode may change later in onload phase.
1340 PropertyList_unique_add(&_system_properties, "java.vm.info",
1341 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1342
1343 UseInterpreter = true;
1344 UseCompiler = true;
1345 UseLoopCounter = true;
1346
1347 // Default values may be platform/compiler dependent -
1348 // use the saved values
1349 ClipInlining = Arguments::_ClipInlining;
1350 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1351 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1352 BackgroundCompilation = Arguments::_BackgroundCompilation;
1353 if (TieredCompilation) {
1354 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1355 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1356 }
1357 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1358 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1359 }
1360 }
1361
1362 // Change from defaults based on mode
1363 switch (mode) {
1364 default:
1365 ShouldNotReachHere();
1366 break;
1367 case _int:
1368 UseCompiler = false;
1369 UseLoopCounter = false;
1370 AlwaysCompileLoopMethods = false;
1371 UseOnStackReplacement = false;
1372 break;
1373 case _mixed:
1374 // same as default
1375 break;
1376 case _comp:
1377 UseInterpreter = false;
1378 BackgroundCompilation = false;
1379 ClipInlining = false;
1380 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1381 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1382 // compile a level 4 (C2) and then continue executing it.
1383 if (TieredCompilation) {
1384 Tier3InvokeNotifyFreqLog = 0;
1385 Tier4InvocationThreshold = 0;
1386 }
1387 break;
1388 }
1389 }
1390
1391 // Conflict: required to use shared spaces (-Xshare:on), but
1392 // incompatible command line options were chosen.
1393 static void no_shared_spaces(const char* message) {
1394 if (RequireSharedSpaces) {
1395 jio_fprintf(defaultStream::error_stream(),
1396 "Class data sharing is inconsistent with other specified options.\n");
1397 vm_exit_during_initialization("Unable to use shared archive.", message);
1398 } else {
1399 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1400 }
1401 }
1402
1403 // Returns threshold scaled with the value of scale.
1404 // If scale < 0.0, threshold is returned without scaling.
1405 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1406 if (scale == 1.0 || scale < 0.0) {
1407 return threshold;
1408 } else {
1409 return (intx)(threshold * scale);
1410 }
1411 }
1412
1413 // Returns freq_log scaled with the value of scale.
1414 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1415 // If scale < 0.0, freq_log is returned without scaling.
1416 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1417 // Check if scaling is necessary or if negative value was specified.
1418 if (scale == 1.0 || scale < 0.0) {
1419 return freq_log;
1420 }
1421 // Check values to avoid calculating log2 of 0.
1422 if (scale == 0.0 || freq_log == 0) {
1423 return 0;
1424 }
1425 // Determine the maximum notification frequency value currently supported.
1426 // The largest mask value that the interpreter/C1 can handle is
1427 // of length InvocationCounter::number_of_count_bits. Mask values are always
1428 // one bit shorter then the value of the notification frequency. Set
1429 // max_freq_bits accordingly.
1430 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1431 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1432 if (scaled_freq == 0) {
1433 // Return 0 right away to avoid calculating log2 of 0.
1434 return 0;
1435 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1436 return max_freq_bits;
1437 } else {
1438 return log2_intptr(scaled_freq);
1439 }
1440 }
1441
1442 void Arguments::set_tiered_flags() {
1443 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1444 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1445 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1446 }
1447 if (CompilationPolicyChoice < 2) {
1448 vm_exit_during_initialization(
1449 "Incompatible compilation policy selected", NULL);
1450 }
1451 // Increase the code cache size - tiered compiles a lot more.
1452 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1453 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1454 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1455 }
1456 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1457 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1458 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1459 }
1460 if (!UseInterpreter) { // -Xcomp
1461 Tier3InvokeNotifyFreqLog = 0;
1462 Tier4InvocationThreshold = 0;
1463 }
1464
1465 if (CompileThresholdScaling < 0) {
1466 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1467 }
1468
1469 // Scale tiered compilation thresholds.
1470 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1471 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1472 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1473 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1474
1475 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1476 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1477 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1478 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1479
1480 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1481 // once these thresholds become supported.
1482
1483 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1484 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1485
1486 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1487 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1488
1489 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1490
1491 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1492 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1493 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1494 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1495 }
1496 }
1497
1498 void set_object_alignment() {
1499 // Object alignment.
1500 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1501 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1502 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1503 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1504 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1505 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1506
1507 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1508 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1509
1510 // Oop encoding heap max
1511 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1512
1513 if (SurvivorAlignmentInBytes == 0) {
1514 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1515 }
1516 }
1517
1518 size_t Arguments::max_heap_for_compressed_oops() {
1519 // Avoid sign flip.
1520 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1521 // We need to fit both the NULL page and the heap into the memory budget, while
1522 // keeping alignment constraints of the heap. To guarantee the latter, as the
1523 // NULL page is located before the heap, we pad the NULL page to the conservative
1524 // maximum alignment that the GC may ever impose upon the heap.
1525 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1526 _conservative_max_heap_alignment);
1527
1528 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1529 NOT_LP64(ShouldNotReachHere(); return 0);
1530 }
1531
1532 void Arguments::set_use_compressed_oops() {
1533 #ifndef ZERO
1534 #ifdef _LP64
1535 // MaxHeapSize is not set up properly at this point, but
1536 // the only value that can override MaxHeapSize if we are
1537 // to use UseCompressedOops is InitialHeapSize.
1538 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1539
1540 if (max_heap_size <= max_heap_for_compressed_oops()) {
1541 #if !defined(COMPILER1) || defined(TIERED)
1542 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1543 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1544 }
1545 #endif
1546 } else {
1547 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1548 warning("Max heap size too large for Compressed Oops");
1549 FLAG_SET_DEFAULT(UseCompressedOops, false);
1550 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1551 }
1552 }
1553 #endif // _LP64
1554 #endif // ZERO
1555 }
1556
1557
1558 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1559 // set_use_compressed_oops().
1560 void Arguments::set_use_compressed_klass_ptrs() {
1561 #ifndef ZERO
1562 #ifdef _LP64
1563 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1564 if (!UseCompressedOops) {
1565 if (UseCompressedClassPointers) {
1566 warning("UseCompressedClassPointers requires UseCompressedOops");
1567 }
1568 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1569 } else {
1570 // Turn on UseCompressedClassPointers too
1571 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1572 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1573 }
1574 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1575 if (UseCompressedClassPointers) {
1576 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1577 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1578 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1579 }
1580 }
1581 }
1582 #endif // _LP64
1583 #endif // !ZERO
1584 }
1585
1586 void Arguments::set_conservative_max_heap_alignment() {
1587 // The conservative maximum required alignment for the heap is the maximum of
1588 // the alignments imposed by several sources: any requirements from the heap
1589 // itself, the collector policy and the maximum page size we may run the VM
1590 // with.
1591 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1592 _conservative_max_heap_alignment = MAX4(heap_alignment,
1593 (size_t)os::vm_allocation_granularity(),
1594 os::max_page_size(),
1595 CollectorPolicy::compute_heap_alignment());
1596 }
1597
1598 #ifdef TIERED
1599 bool Arguments::compilation_mode_selected() {
1600 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1601 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1602
1603 }
1604
1605 void Arguments::select_compilation_mode_ergonomically() {
1606 #if defined(_WINDOWS) && !defined(_LP64)
1607 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1608 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1609 }
1610 #endif
1611 if (NeverActAsServerClassMachine) {
1612 set_client_compilation_mode();
1613 }
1614 }
1615 #endif //TIERED
1616
1617 #if INCLUDE_JVMCI
1618 void Arguments::set_jvmci_specific_flags() {
1619 if (UseJVMCICompiler) {
1620 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1621 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1622 }
1623 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1624 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1625 }
1626 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1627 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1628 }
1629 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1630 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1631 }
1632 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1633 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1634 }
1635 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1636 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1637 }
1638 if (TieredStopAtLevel != CompLevel_full_optimization) {
1639 // Currently JVMCI compiler can only work at the full optimization level
1640 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1641 TieredStopAtLevel = CompLevel_full_optimization;
1642 }
1643 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1644 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1645 }
1646 }
1647 }
1648 #endif
1649
1650 jint Arguments::set_ergonomics_flags() {
1651 #ifdef TIERED
1652 if (!compilation_mode_selected()) {
1653 select_compilation_mode_ergonomically();
1654 }
1655 #endif
1656
1657 jint gc_result = GCArguments::initialize();
1658 if (gc_result != JNI_OK) {
1659 return gc_result;
1660 }
1661
1662 #if defined(COMPILER2) || INCLUDE_JVMCI
1663 // Shared spaces work fine with other GCs but causes bytecode rewriting
1664 // to be disabled, which hurts interpreter performance and decreases
1665 // server performance. When -server is specified, keep the default off
1666 // unless it is asked for. Future work: either add bytecode rewriting
1667 // at link time, or rewrite bytecodes in non-shared methods.
1668 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1669 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1670 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1671 }
1672 #endif
1673
1674 set_conservative_max_heap_alignment();
1675
1676 #ifndef ZERO
1677 #ifdef _LP64
1678 set_use_compressed_oops();
1679
1680 // set_use_compressed_klass_ptrs() must be called after calling
1681 // set_use_compressed_oops().
1682 set_use_compressed_klass_ptrs();
1683
1684 // Also checks that certain machines are slower with compressed oops
1685 // in vm_version initialization code.
1686 #endif // _LP64
1687 #endif // !ZERO
1688
1689 return JNI_OK;
1690 }
1691
1692 void Arguments::set_gc_specific_flags() {
1693 // Set GC flags
1694 GCArguments::arguments()->initialize_flags();
1695 }
1696
1697 julong Arguments::limit_by_allocatable_memory(julong limit) {
1698 julong max_allocatable;
1699 julong result = limit;
1700 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1701 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1702 }
1703 return result;
1704 }
1705
1706 // Use static initialization to get the default before parsing
1707 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1708
1709 void Arguments::set_heap_size() {
1710 julong phys_mem =
1711 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1712 : (julong)MaxRAM;
1713
1714 // Experimental support for CGroup memory limits
1715 if (UseCGroupMemoryLimitForHeap) {
1716 // This is a rough indicator that a CGroup limit may be in force
1717 // for this process
1718 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1719 FILE *fp = fopen(lim_file, "r");
1720 if (fp != NULL) {
1721 julong cgroup_max = 0;
1722 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1723 if (ret == 1 && cgroup_max > 0) {
1724 // If unlimited, cgroup_max will be a very large, but unspecified
1725 // value, so use initial phys_mem as a limit
1726 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
1727 JULONG_FORMAT "MB) and initial phys_mem ("
1728 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1729 phys_mem = MIN2(cgroup_max, phys_mem);
1730 } else {
1731 warning("Unable to read/parse cgroup memory limit from %s: %s",
1732 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1733 }
1734 fclose(fp);
1735 } else {
1736 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1737 }
1738 }
1739
1740 // Convert deprecated flags
1741 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1742 !FLAG_IS_DEFAULT(MaxRAMFraction))
1743 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1744
1745 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1746 !FLAG_IS_DEFAULT(MinRAMFraction))
1747 MinRAMPercentage = 100.0 / MinRAMFraction;
1748
1749 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1750 !FLAG_IS_DEFAULT(InitialRAMFraction))
1751 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1752
1753 // If the maximum heap size has not been set with -Xmx,
1754 // then set it as fraction of the size of physical memory,
1755 // respecting the maximum and minimum sizes of the heap.
1756 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1757 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1758 if (phys_mem <= (julong)((MaxHeapSize * MinRAMPercentage) / 100)) {
1759 // Small physical memory, so use a minimum fraction of it for the heap
1760 reasonable_max = (julong)((phys_mem * MinRAMPercentage) / 100);
1761 } else {
1762 // Not-small physical memory, so require a heap at least
1763 // as large as MaxHeapSize
1764 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1765 }
1766
1767 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1768 // Limit the heap size to ErgoHeapSizeLimit
1769 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1770 }
1771 if (UseCompressedOops) {
1772 // Limit the heap size to the maximum possible when using compressed oops
1773 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1774
1775 // HeapBaseMinAddress can be greater than default but not less than.
1776 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1777 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1778 // matches compressed oops printing flags
1779 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1780 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1781 DefaultHeapBaseMinAddress,
1782 DefaultHeapBaseMinAddress/G,
1783 HeapBaseMinAddress);
1784 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1785 }
1786 }
1787
1788 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1789 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1790 // but it should be not less than default MaxHeapSize.
1791 max_coop_heap -= HeapBaseMinAddress;
1792 }
1793 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1794 }
1795 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1796
1797 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1798 // An initial heap size was specified on the command line,
1799 // so be sure that the maximum size is consistent. Done
1800 // after call to limit_by_allocatable_memory because that
1801 // method might reduce the allocation size.
1802 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1803 }
1804
1805 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1806 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1807 }
1808
1809 // If the minimum or initial heap_size have not been set or requested to be set
1810 // ergonomically, set them accordingly.
1811 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1812 julong reasonable_minimum = (julong)(OldSize + NewSize);
1813
1814 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1815
1816 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1817
1818 if (InitialHeapSize == 0) {
1819 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1820
1821 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1822 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1823
1824 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1825
1826 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1827 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1828 }
1829 // If the minimum heap size has not been set (via -Xms),
1830 // synchronize with InitialHeapSize to avoid errors with the default value.
1831 if (min_heap_size() == 0) {
1832 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1833 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1834 }
1835 }
1836 }
1837
1838 // This option inspects the machine and attempts to set various
1839 // parameters to be optimal for long-running, memory allocation
1840 // intensive jobs. It is intended for machines with large
1841 // amounts of cpu and memory.
1842 jint Arguments::set_aggressive_heap_flags() {
1843 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1844 // VM, but we may not be able to represent the total physical memory
1845 // available (like having 8gb of memory on a box but using a 32bit VM).
1846 // Thus, we need to make sure we're using a julong for intermediate
1847 // calculations.
1848 julong initHeapSize;
1849 julong total_memory = os::physical_memory();
1850
1851 if (total_memory < (julong) 256 * M) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1854 vm_exit(1);
1855 }
1856
1857 // The heap size is half of available memory, or (at most)
1858 // all of possible memory less 160mb (leaving room for the OS
1859 // when using ISM). This is the maximum; because adaptive sizing
1860 // is turned on below, the actual space used may be smaller.
1861
1862 initHeapSize = MIN2(total_memory / (julong) 2,
1863 total_memory - (julong) 160 * M);
1864
1865 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1866
1867 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1868 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
1869 return JNI_EINVAL;
1870 }
1871 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
1872 return JNI_EINVAL;
1873 }
1874 // Currently the minimum size and the initial heap sizes are the same.
1875 set_min_heap_size(initHeapSize);
1876 }
1877 if (FLAG_IS_DEFAULT(NewSize)) {
1878 // Make the young generation 3/8ths of the total heap.
1879 if (FLAG_SET_CMDLINE(size_t, NewSize,
1880 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
1881 return JNI_EINVAL;
1882 }
1883 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
1884 return JNI_EINVAL;
1885 }
1886 }
1887
1888 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1889 FLAG_SET_DEFAULT(UseLargePages, true);
1890 #endif
1891
1892 // Increase some data structure sizes for efficiency
1893 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
1894 return JNI_EINVAL;
1895 }
1896 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
1897 return JNI_EINVAL;
1898 }
1899 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
1900 return JNI_EINVAL;
1901 }
1902
1903 // See the OldPLABSize comment below, but replace 'after promotion'
1904 // with 'after copying'. YoungPLABSize is the size of the survivor
1905 // space per-gc-thread buffers. The default is 4kw.
1906 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
1907 return JNI_EINVAL;
1908 }
1909
1910 // OldPLABSize is the size of the buffers in the old gen that
1911 // UseParallelGC uses to promote live data that doesn't fit in the
1912 // survivor spaces. At any given time, there's one for each gc thread.
1913 // The default size is 1kw. These buffers are rarely used, since the
1914 // survivor spaces are usually big enough. For specjbb, however, there
1915 // are occasions when there's lots of live data in the young gen
1916 // and we end up promoting some of it. We don't have a definite
1917 // explanation for why bumping OldPLABSize helps, but the theory
1918 // is that a bigger PLAB results in retaining something like the
1919 // original allocation order after promotion, which improves mutator
1920 // locality. A minor effect may be that larger PLABs reduce the
1921 // number of PLAB allocation events during gc. The value of 8kw
1922 // was arrived at by experimenting with specjbb.
1923 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
1924 return JNI_EINVAL;
1925 }
1926
1927 // Enable parallel GC and adaptive generation sizing
1928 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
1929 return JNI_EINVAL;
1930 }
1931
1932 // Encourage steady state memory management
1933 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
1934 return JNI_EINVAL;
1935 }
1936
1937 // This appears to improve mutator locality
1938 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
1939 return JNI_EINVAL;
1940 }
1941
1942 // Get around early Solaris scheduling bug
1943 // (affinity vs other jobs on system)
1944 // but disallow DR and offlining (5008695).
1945 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
1946 return JNI_EINVAL;
1947 }
1948
1949 return JNI_OK;
1950 }
1951
1952 // This must be called after ergonomics.
1953 void Arguments::set_bytecode_flags() {
1954 if (!RewriteBytecodes) {
1955 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1956 }
1957 }
1958
1959 // Aggressive optimization flags -XX:+AggressiveOpts
1960 jint Arguments::set_aggressive_opts_flags() {
1961 #ifdef COMPILER2
1962 if (AggressiveUnboxing) {
1963 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1964 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1965 } else if (!EliminateAutoBox) {
1966 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1967 AggressiveUnboxing = false;
1968 }
1969 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1970 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1971 } else if (!DoEscapeAnalysis) {
1972 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1973 AggressiveUnboxing = false;
1974 }
1975 }
1976 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1977 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1978 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1979 }
1980 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1981 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1982 }
1983
1984 // Feed the cache size setting into the JDK
1985 char buffer[1024];
1986 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1987 if (!add_property(buffer)) {
1988 return JNI_ENOMEM;
1989 }
1990 }
1991 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1992 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1993 }
1994 #endif
1995
1996 if (AggressiveOpts) {
1997 // Sample flag setting code
1998 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1999 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2000 // }
2001 }
2002
2003 return JNI_OK;
2004 }
2005
2006 //===========================================================================================================
2007 // Parsing of java.compiler property
2008
2009 void Arguments::process_java_compiler_argument(const char* arg) {
2010 // For backwards compatibility, Djava.compiler=NONE or ""
2011 // causes us to switch to -Xint mode UNLESS -Xdebug
2012 // is also specified.
2013 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2014 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2015 }
2016 }
2017
2018 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2019 _sun_java_launcher = os::strdup_check_oom(launcher);
2020 }
2021
2022 bool Arguments::created_by_java_launcher() {
2023 assert(_sun_java_launcher != NULL, "property must have value");
2024 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2025 }
2026
2027 bool Arguments::sun_java_launcher_is_altjvm() {
2028 return _sun_java_launcher_is_altjvm;
2029 }
2030
2031 //===========================================================================================================
2032 // Parsing of main arguments
2033
2034 #if INCLUDE_JVMCI
2035 // Check consistency of jvmci vm argument settings.
2036 bool Arguments::check_jvmci_args_consistency() {
2037 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2038 }
2039 #endif //INCLUDE_JVMCI
2040
2041 // Check consistency of GC selection
2042 bool Arguments::check_gc_consistency() {
2043 // Ensure that the user has not selected conflicting sets
2044 // of collectors.
2045 uint i = 0;
2046 if (UseSerialGC) i++;
2047 if (UseConcMarkSweepGC) i++;
2048 if (UseParallelGC || UseParallelOldGC) i++;
2049 if (UseG1GC) i++;
2050 if (i > 1) {
2051 jio_fprintf(defaultStream::error_stream(),
2052 "Conflicting collector combinations in option list; "
2053 "please refer to the release notes for the combinations "
2054 "allowed\n");
2055 return false;
2056 }
2057
2058 return true;
2059 }
2060
2061 // Check the consistency of vm_init_args
2062 bool Arguments::check_vm_args_consistency() {
2063 // Method for adding checks for flag consistency.
2064 // The intent is to warn the user of all possible conflicts,
2065 // before returning an error.
2066 // Note: Needs platform-dependent factoring.
2067 bool status = true;
2068
2069 if (TLABRefillWasteFraction == 0) {
2070 jio_fprintf(defaultStream::error_stream(),
2071 "TLABRefillWasteFraction should be a denominator, "
2072 "not " SIZE_FORMAT "\n",
2073 TLABRefillWasteFraction);
2074 status = false;
2075 }
2076
2077 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2078 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2079 }
2080
2081 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2082 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2083 }
2084
2085 if (GCTimeLimit == 100) {
2086 // Turn off gc-overhead-limit-exceeded checks
2087 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2088 }
2089
2090 status = status && check_gc_consistency();
2091
2092 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2093 // insists that we hold the requisite locks so that the iteration is
2094 // MT-safe. For the verification at start-up and shut-down, we don't
2095 // yet have a good way of acquiring and releasing these locks,
2096 // which are not visible at the CollectedHeap level. We want to
2097 // be able to acquire these locks and then do the iteration rather
2098 // than just disable the lock verification. This will be fixed under
2099 // bug 4788986.
2100 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2101 if (VerifyDuringStartup) {
2102 warning("Heap verification at start-up disabled "
2103 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2104 VerifyDuringStartup = false; // Disable verification at start-up
2105 }
2106
2107 if (VerifyBeforeExit) {
2108 warning("Heap verification at shutdown disabled "
2109 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2110 VerifyBeforeExit = false; // Disable verification at shutdown
2111 }
2112 }
2113
2114 if (PrintNMTStatistics) {
2115 #if INCLUDE_NMT
2116 if (MemTracker::tracking_level() == NMT_off) {
2117 #endif // INCLUDE_NMT
2118 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2119 PrintNMTStatistics = false;
2120 #if INCLUDE_NMT
2121 }
2122 #endif
2123 }
2124
2125 #if INCLUDE_JVMCI
2126 status = status && check_jvmci_args_consistency();
2127
2128 if (EnableJVMCI) {
2129 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2130 AddProperty, UnwriteableProperty, InternalProperty);
2131
2132 if (!ScavengeRootsInCode) {
2133 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2134 ScavengeRootsInCode = 1;
2135 }
2136 }
2137 #endif
2138
2139 // Check lower bounds of the code cache
2140 // Template Interpreter code is approximately 3X larger in debug builds.
2141 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2142 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2143 jio_fprintf(defaultStream::error_stream(),
2144 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2145 os::vm_page_size()/K);
2146 status = false;
2147 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2148 jio_fprintf(defaultStream::error_stream(),
2149 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2150 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2151 status = false;
2152 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2153 jio_fprintf(defaultStream::error_stream(),
2154 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2155 min_code_cache_size/K);
2156 status = false;
2157 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2158 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2159 jio_fprintf(defaultStream::error_stream(),
2160 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2161 CODE_CACHE_SIZE_LIMIT/M);
2162 status = false;
2163 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2164 jio_fprintf(defaultStream::error_stream(),
2165 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2166 min_code_cache_size/K);
2167 status = false;
2168 }
2169
2170 #ifdef _LP64
2171 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2172 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2173 }
2174 #endif
2175
2176 #ifndef SUPPORT_RESERVED_STACK_AREA
2177 if (StackReservedPages != 0) {
2178 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2179 warning("Reserved Stack Area not supported on this platform");
2180 }
2181 #endif
2182
2183 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2184 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2185 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2186 }
2187 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2188 }
2189 if (UseCompiler && is_interpreter_only()) {
2190 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2191 warning("UseCompiler disabled due to -Xint.");
2192 }
2193 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2194 }
2195 #ifdef COMPILER2
2196 if (PostLoopMultiversioning && !RangeCheckElimination) {
2197 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2198 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2199 }
2200 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2201 }
2202 #endif
2203 return status;
2204 }
2205
2206 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2207 const char* option_type) {
2208 if (ignore) return false;
2209
2210 const char* spacer = " ";
2211 if (option_type == NULL) {
2212 option_type = ++spacer; // Set both to the empty string.
2213 }
2214
2215 if (os::obsolete_option(option)) {
2216 jio_fprintf(defaultStream::error_stream(),
2217 "Obsolete %s%soption: %s\n", option_type, spacer,
2218 option->optionString);
2219 return false;
2220 } else {
2221 jio_fprintf(defaultStream::error_stream(),
2222 "Unrecognized %s%soption: %s\n", option_type, spacer,
2223 option->optionString);
2224 return true;
2225 }
2226 }
2227
2228 static const char* user_assertion_options[] = {
2229 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2230 };
2231
2232 static const char* system_assertion_options[] = {
2233 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2234 };
2235
2236 bool Arguments::parse_uintx(const char* value,
2237 uintx* uintx_arg,
2238 uintx min_size) {
2239
2240 // Check the sign first since atojulong() parses only unsigned values.
2241 bool value_is_positive = !(*value == '-');
2242
2243 if (value_is_positive) {
2244 julong n;
2245 bool good_return = atojulong(value, &n);
2246 if (good_return) {
2247 bool above_minimum = n >= min_size;
2248 bool value_is_too_large = n > max_uintx;
2249
2250 if (above_minimum && !value_is_too_large) {
2251 *uintx_arg = n;
2252 return true;
2253 }
2254 }
2255 }
2256 return false;
2257 }
2258
2259 unsigned int addreads_count = 0;
2260 unsigned int addexports_count = 0;
2261 unsigned int addopens_count = 0;
2262 unsigned int addmods_count = 0;
2263 unsigned int patch_mod_count = 0;
2264
2265 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2266 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2267 char* property = AllocateHeap(prop_len, mtArguments);
2268 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2269 if (ret < 0 || ret >= (int)prop_len) {
2270 FreeHeap(property);
2271 return false;
2272 }
2273 bool added = add_property(property, UnwriteableProperty, internal);
2274 FreeHeap(property);
2275 return added;
2276 }
2277
2278 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2279 const unsigned int props_count_limit = 1000;
2280 const int max_digits = 3;
2281 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2282
2283 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2284 if (count < props_count_limit) {
2285 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2286 char* property = AllocateHeap(prop_len, mtArguments);
2287 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2288 if (ret < 0 || ret >= (int)prop_len) {
2289 FreeHeap(property);
2290 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2291 return false;
2292 }
2293 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2294 FreeHeap(property);
2295 return added;
2296 }
2297
2298 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2299 return false;
2300 }
2301
2302 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2303 julong* long_arg,
2304 julong min_size,
2305 julong max_size) {
2306 if (!atojulong(s, long_arg)) return arg_unreadable;
2307 return check_memory_size(*long_arg, min_size, max_size);
2308 }
2309
2310 // Parse JavaVMInitArgs structure
2311
2312 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2313 const JavaVMInitArgs *java_options_args,
2314 const JavaVMInitArgs *cmd_line_args) {
2315 bool patch_mod_javabase = false;
2316
2317 // Save default settings for some mode flags
2318 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2319 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2320 Arguments::_ClipInlining = ClipInlining;
2321 Arguments::_BackgroundCompilation = BackgroundCompilation;
2322 if (TieredCompilation) {
2323 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2324 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2325 }
2326
2327 // Setup flags for mixed which is the default
2328 set_mode_flags(_mixed);
2329
2330 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2331 // variable (if present).
2332 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2333 if (result != JNI_OK) {
2334 return result;
2335 }
2336
2337 // Parse args structure generated from the command line flags.
2338 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2339 if (result != JNI_OK) {
2340 return result;
2341 }
2342
2343 // Parse args structure generated from the _JAVA_OPTIONS environment
2344 // variable (if present) (mimics classic VM)
2345 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2346 if (result != JNI_OK) {
2347 return result;
2348 }
2349
2350 // Do final processing now that all arguments have been parsed
2351 result = finalize_vm_init_args(patch_mod_javabase);
2352 if (result != JNI_OK) {
2353 return result;
2354 }
2355
2356 return JNI_OK;
2357 }
2358
2359 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2360 // represents a valid JDWP agent. is_path==true denotes that we
2361 // are dealing with -agentpath (case where name is a path), otherwise with
2362 // -agentlib
2363 bool valid_jdwp_agent(char *name, bool is_path) {
2364 char *_name;
2365 const char *_jdwp = "jdwp";
2366 size_t _len_jdwp, _len_prefix;
2367
2368 if (is_path) {
2369 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2370 return false;
2371 }
2372
2373 _name++; // skip past last path separator
2374 _len_prefix = strlen(JNI_LIB_PREFIX);
2375
2376 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2377 return false;
2378 }
2379
2380 _name += _len_prefix;
2381 _len_jdwp = strlen(_jdwp);
2382
2383 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2384 _name += _len_jdwp;
2385 }
2386 else {
2387 return false;
2388 }
2389
2390 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2391 return false;
2392 }
2393
2394 return true;
2395 }
2396
2397 if (strcmp(name, _jdwp) == 0) {
2398 return true;
2399 }
2400
2401 return false;
2402 }
2403
2404 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2405 // --patch-module=<module>=<file>(<pathsep><file>)*
2406 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2407 // Find the equal sign between the module name and the path specification
2408 const char* module_equal = strchr(patch_mod_tail, '=');
2409 if (module_equal == NULL) {
2410 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2411 return JNI_ERR;
2412 } else {
2413 // Pick out the module name
2414 size_t module_len = module_equal - patch_mod_tail;
2415 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2416 if (module_name != NULL) {
2417 memcpy(module_name, patch_mod_tail, module_len);
2418 *(module_name + module_len) = '\0';
2419 // The path piece begins one past the module_equal sign
2420 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2421 FREE_C_HEAP_ARRAY(char, module_name);
2422 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2423 return JNI_ENOMEM;
2424 }
2425 } else {
2426 return JNI_ENOMEM;
2427 }
2428 }
2429 return JNI_OK;
2430 }
2431
2432 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2433 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2434 // The min and max sizes match the values in globals.hpp, but scaled
2435 // with K. The values have been chosen so that alignment with page
2436 // size doesn't change the max value, which makes the conversions
2437 // back and forth between Xss value and ThreadStackSize value easier.
2438 // The values have also been chosen to fit inside a 32-bit signed type.
2439 const julong min_ThreadStackSize = 0;
2440 const julong max_ThreadStackSize = 1 * M;
2441
2442 const julong min_size = min_ThreadStackSize * K;
2443 const julong max_size = max_ThreadStackSize * K;
2444
2445 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2446
2447 julong size = 0;
2448 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2449 if (errcode != arg_in_range) {
2450 bool silent = (option == NULL); // Allow testing to silence error messages
2451 if (!silent) {
2452 jio_fprintf(defaultStream::error_stream(),
2453 "Invalid thread stack size: %s\n", option->optionString);
2454 describe_range_error(errcode);
2455 }
2456 return JNI_EINVAL;
2457 }
2458
2459 // Internally track ThreadStackSize in units of 1024 bytes.
2460 const julong size_aligned = align_up(size, K);
2461 assert(size <= size_aligned,
2462 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2463 size, size_aligned);
2464
2465 const julong size_in_K = size_aligned / K;
2466 assert(size_in_K < (julong)max_intx,
2467 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2468 size_in_K);
2469
2470 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2471 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2472 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2473 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2474 max_expanded, size_in_K);
2475
2476 *out_ThreadStackSize = (intx)size_in_K;
2477
2478 return JNI_OK;
2479 }
2480
2481 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2482 // For match_option to return remaining or value part of option string
2483 const char* tail;
2484
2485 // iterate over arguments
2486 for (int index = 0; index < args->nOptions; index++) {
2487 bool is_absolute_path = false; // for -agentpath vs -agentlib
2488
2489 const JavaVMOption* option = args->options + index;
2490
2491 if (!match_option(option, "-Djava.class.path", &tail) &&
2492 !match_option(option, "-Dsun.java.command", &tail) &&
2493 !match_option(option, "-Dsun.java.launcher", &tail)) {
2494
2495 // add all jvm options to the jvm_args string. This string
2496 // is used later to set the java.vm.args PerfData string constant.
2497 // the -Djava.class.path and the -Dsun.java.command options are
2498 // omitted from jvm_args string as each have their own PerfData
2499 // string constant object.
2500 build_jvm_args(option->optionString);
2501 }
2502
2503 // -verbose:[class/module/gc/jni]
2504 if (match_option(option, "-verbose", &tail)) {
2505 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2506 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2507 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2508 } else if (!strcmp(tail, ":module")) {
2509 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2510 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2511 } else if (!strcmp(tail, ":gc")) {
2512 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2513 } else if (!strcmp(tail, ":jni")) {
2514 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2515 return JNI_EINVAL;
2516 }
2517 }
2518 // -da / -ea / -disableassertions / -enableassertions
2519 // These accept an optional class/package name separated by a colon, e.g.,
2520 // -da:java.lang.Thread.
2521 } else if (match_option(option, user_assertion_options, &tail, true)) {
2522 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2523 if (*tail == '\0') {
2524 JavaAssertions::setUserClassDefault(enable);
2525 } else {
2526 assert(*tail == ':', "bogus match by match_option()");
2527 JavaAssertions::addOption(tail + 1, enable);
2528 }
2529 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2530 } else if (match_option(option, system_assertion_options, &tail, false)) {
2531 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2532 JavaAssertions::setSystemClassDefault(enable);
2533 // -bootclasspath:
2534 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2535 jio_fprintf(defaultStream::output_stream(),
2536 "-Xbootclasspath is no longer a supported option.\n");
2537 return JNI_EINVAL;
2538 // -bootclasspath/a:
2539 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2540 Arguments::append_sysclasspath(tail);
2541 // -bootclasspath/p:
2542 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2543 jio_fprintf(defaultStream::output_stream(),
2544 "-Xbootclasspath/p is no longer a supported option.\n");
2545 return JNI_EINVAL;
2546 // -Xrun
2547 } else if (match_option(option, "-Xrun", &tail)) {
2548 if (tail != NULL) {
2549 const char* pos = strchr(tail, ':');
2550 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2551 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2552 jio_snprintf(name, len + 1, "%s", tail);
2553
2554 char *options = NULL;
2555 if(pos != NULL) {
2556 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2557 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2558 }
2559 #if !INCLUDE_JVMTI
2560 if (strcmp(name, "jdwp") == 0) {
2561 jio_fprintf(defaultStream::error_stream(),
2562 "Debugging agents are not supported in this VM\n");
2563 return JNI_ERR;
2564 }
2565 #endif // !INCLUDE_JVMTI
2566 add_init_library(name, options);
2567 }
2568 } else if (match_option(option, "--add-reads=", &tail)) {
2569 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2570 return JNI_ENOMEM;
2571 }
2572 } else if (match_option(option, "--add-exports=", &tail)) {
2573 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2574 return JNI_ENOMEM;
2575 }
2576 } else if (match_option(option, "--add-opens=", &tail)) {
2577 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2578 return JNI_ENOMEM;
2579 }
2580 } else if (match_option(option, "--add-modules=", &tail)) {
2581 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2582 return JNI_ENOMEM;
2583 }
2584 } else if (match_option(option, "--limit-modules=", &tail)) {
2585 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2586 return JNI_ENOMEM;
2587 }
2588 } else if (match_option(option, "--module-path=", &tail)) {
2589 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2590 return JNI_ENOMEM;
2591 }
2592 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2593 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2594 return JNI_ENOMEM;
2595 }
2596 } else if (match_option(option, "--patch-module=", &tail)) {
2597 // --patch-module=<module>=<file>(<pathsep><file>)*
2598 int res = process_patch_mod_option(tail, patch_mod_javabase);
2599 if (res != JNI_OK) {
2600 return res;
2601 }
2602 } else if (match_option(option, "--illegal-access=", &tail)) {
2603 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2604 return JNI_ENOMEM;
2605 }
2606 // -agentlib and -agentpath
2607 } else if (match_option(option, "-agentlib:", &tail) ||
2608 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2609 if(tail != NULL) {
2610 const char* pos = strchr(tail, '=');
2611 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2612 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2613 name[len] = '\0';
2614
2615 char *options = NULL;
2616 if(pos != NULL) {
2617 options = os::strdup_check_oom(pos + 1, mtArguments);
2618 }
2619 #if !INCLUDE_JVMTI
2620 if (valid_jdwp_agent(name, is_absolute_path)) {
2621 jio_fprintf(defaultStream::error_stream(),
2622 "Debugging agents are not supported in this VM\n");
2623 return JNI_ERR;
2624 }
2625 #endif // !INCLUDE_JVMTI
2626 add_init_agent(name, options, is_absolute_path);
2627 }
2628 // -javaagent
2629 } else if (match_option(option, "-javaagent:", &tail)) {
2630 #if !INCLUDE_JVMTI
2631 jio_fprintf(defaultStream::error_stream(),
2632 "Instrumentation agents are not supported in this VM\n");
2633 return JNI_ERR;
2634 #else
2635 if (tail != NULL) {
2636 size_t length = strlen(tail) + 1;
2637 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2638 jio_snprintf(options, length, "%s", tail);
2639 add_init_agent("instrument", options, false);
2640 // java agents need module java.instrument
2641 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2642 return JNI_ENOMEM;
2643 }
2644 }
2645 #endif // !INCLUDE_JVMTI
2646 // -Xnoclassgc
2647 } else if (match_option(option, "-Xnoclassgc")) {
2648 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2649 return JNI_EINVAL;
2650 }
2651 // -Xconcgc
2652 } else if (match_option(option, "-Xconcgc")) {
2653 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2654 return JNI_EINVAL;
2655 }
2656 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2657 // -Xnoconcgc
2658 } else if (match_option(option, "-Xnoconcgc")) {
2659 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2660 return JNI_EINVAL;
2661 }
2662 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2663 // -Xbatch
2664 } else if (match_option(option, "-Xbatch")) {
2665 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2666 return JNI_EINVAL;
2667 }
2668 // -Xmn for compatibility with other JVM vendors
2669 } else if (match_option(option, "-Xmn", &tail)) {
2670 julong long_initial_young_size = 0;
2671 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2672 if (errcode != arg_in_range) {
2673 jio_fprintf(defaultStream::error_stream(),
2674 "Invalid initial young generation size: %s\n", option->optionString);
2675 describe_range_error(errcode);
2676 return JNI_EINVAL;
2677 }
2678 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2679 return JNI_EINVAL;
2680 }
2681 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2682 return JNI_EINVAL;
2683 }
2684 // -Xms
2685 } else if (match_option(option, "-Xms", &tail)) {
2686 julong long_initial_heap_size = 0;
2687 // an initial heap size of 0 means automatically determine
2688 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2689 if (errcode != arg_in_range) {
2690 jio_fprintf(defaultStream::error_stream(),
2691 "Invalid initial heap size: %s\n", option->optionString);
2692 describe_range_error(errcode);
2693 return JNI_EINVAL;
2694 }
2695 set_min_heap_size((size_t)long_initial_heap_size);
2696 // Currently the minimum size and the initial heap sizes are the same.
2697 // Can be overridden with -XX:InitialHeapSize.
2698 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2699 return JNI_EINVAL;
2700 }
2701 // -Xmx
2702 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2703 julong long_max_heap_size = 0;
2704 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2705 if (errcode != arg_in_range) {
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Invalid maximum heap size: %s\n", option->optionString);
2708 describe_range_error(errcode);
2709 return JNI_EINVAL;
2710 }
2711 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 // Xmaxf
2715 } else if (match_option(option, "-Xmaxf", &tail)) {
2716 char* err;
2717 int maxf = (int)(strtod(tail, &err) * 100);
2718 if (*err != '\0' || *tail == '\0') {
2719 jio_fprintf(defaultStream::error_stream(),
2720 "Bad max heap free percentage size: %s\n",
2721 option->optionString);
2722 return JNI_EINVAL;
2723 } else {
2724 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 }
2728 // Xminf
2729 } else if (match_option(option, "-Xminf", &tail)) {
2730 char* err;
2731 int minf = (int)(strtod(tail, &err) * 100);
2732 if (*err != '\0' || *tail == '\0') {
2733 jio_fprintf(defaultStream::error_stream(),
2734 "Bad min heap free percentage size: %s\n",
2735 option->optionString);
2736 return JNI_EINVAL;
2737 } else {
2738 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2739 return JNI_EINVAL;
2740 }
2741 }
2742 // -Xss
2743 } else if (match_option(option, "-Xss", &tail)) {
2744 intx value = 0;
2745 jint err = parse_xss(option, tail, &value);
2746 if (err != JNI_OK) {
2747 return err;
2748 }
2749 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2753 julong long_CodeCacheExpansionSize = 0;
2754 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2755 if (errcode != arg_in_range) {
2756 jio_fprintf(defaultStream::error_stream(),
2757 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2758 os::vm_page_size()/K);
2759 return JNI_EINVAL;
2760 }
2761 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2765 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2766 julong long_ReservedCodeCacheSize = 0;
2767
2768 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2769 if (errcode != arg_in_range) {
2770 jio_fprintf(defaultStream::error_stream(),
2771 "Invalid maximum code cache size: %s.\n", option->optionString);
2772 return JNI_EINVAL;
2773 }
2774 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 // -XX:NonNMethodCodeHeapSize=
2778 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2779 julong long_NonNMethodCodeHeapSize = 0;
2780
2781 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2782 if (errcode != arg_in_range) {
2783 jio_fprintf(defaultStream::error_stream(),
2784 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2785 return JNI_EINVAL;
2786 }
2787 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 // -XX:ProfiledCodeHeapSize=
2791 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2792 julong long_ProfiledCodeHeapSize = 0;
2793
2794 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2795 if (errcode != arg_in_range) {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2798 return JNI_EINVAL;
2799 }
2800 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2801 return JNI_EINVAL;
2802 }
2803 // -XX:NonProfiledCodeHeapSizee=
2804 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2805 julong long_NonProfiledCodeHeapSize = 0;
2806
2807 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2808 if (errcode != arg_in_range) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2811 return JNI_EINVAL;
2812 }
2813 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2814 return JNI_EINVAL;
2815 }
2816 // -green
2817 } else if (match_option(option, "-green")) {
2818 jio_fprintf(defaultStream::error_stream(),
2819 "Green threads support not available\n");
2820 return JNI_EINVAL;
2821 // -native
2822 } else if (match_option(option, "-native")) {
2823 // HotSpot always uses native threads, ignore silently for compatibility
2824 // -Xrs
2825 } else if (match_option(option, "-Xrs")) {
2826 // Classic/EVM option, new functionality
2827 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2828 return JNI_EINVAL;
2829 }
2830 // -Xprof
2831 } else if (match_option(option, "-Xprof")) {
2832 char version[256];
2833 // Obsolete in JDK 10
2834 JDK_Version::jdk(10).to_string(version, sizeof(version));
2835 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2836 // -Xconcurrentio
2837 } else if (match_option(option, "-Xconcurrentio")) {
2838 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2839 return JNI_EINVAL;
2840 }
2841 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2842 return JNI_EINVAL;
2843 }
2844 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2845 return JNI_EINVAL;
2846 }
2847 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2848 return JNI_EINVAL;
2849 }
2850 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2851 return JNI_EINVAL;
2852 }
2853
2854 // -Xinternalversion
2855 } else if (match_option(option, "-Xinternalversion")) {
2856 jio_fprintf(defaultStream::output_stream(), "%s\n",
2857 VM_Version::internal_vm_info_string());
2858 vm_exit(0);
2859 #ifndef PRODUCT
2860 // -Xprintflags
2861 } else if (match_option(option, "-Xprintflags")) {
2862 CommandLineFlags::printFlags(tty, false);
2863 vm_exit(0);
2864 #endif
2865 // -D
2866 } else if (match_option(option, "-D", &tail)) {
2867 const char* value;
2868 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2869 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2870 // abort if -Djava.endorsed.dirs is set
2871 jio_fprintf(defaultStream::output_stream(),
2872 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2873 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2874 return JNI_EINVAL;
2875 }
2876 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2877 *value != '\0' && strcmp(value, "\"\"") != 0) {
2878 // abort if -Djava.ext.dirs is set
2879 jio_fprintf(defaultStream::output_stream(),
2880 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2881 return JNI_EINVAL;
2882 }
2883 // Check for module related properties. They must be set using the modules
2884 // options. For example: use "--add-modules=java.sql", not
2885 // "-Djdk.module.addmods=java.sql"
2886 if (is_internal_module_property(option->optionString + 2)) {
2887 needs_module_property_warning = true;
2888 continue;
2889 }
2890
2891 if (!add_property(tail)) {
2892 return JNI_ENOMEM;
2893 }
2894 // Out of the box management support
2895 if (match_option(option, "-Dcom.sun.management", &tail)) {
2896 #if INCLUDE_MANAGEMENT
2897 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2898 return JNI_EINVAL;
2899 }
2900 // management agent in module jdk.management.agent
2901 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2902 return JNI_ENOMEM;
2903 }
2904 #else
2905 jio_fprintf(defaultStream::output_stream(),
2906 "-Dcom.sun.management is not supported in this VM.\n");
2907 return JNI_ERR;
2908 #endif
2909 }
2910 // -Xint
2911 } else if (match_option(option, "-Xint")) {
2912 set_mode_flags(_int);
2913 // -Xmixed
2914 } else if (match_option(option, "-Xmixed")) {
2915 set_mode_flags(_mixed);
2916 // -Xcomp
2917 } else if (match_option(option, "-Xcomp")) {
2918 // for testing the compiler; turn off all flags that inhibit compilation
2919 set_mode_flags(_comp);
2920 // -Xshare:dump
2921 } else if (match_option(option, "-Xshare:dump")) {
2922 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2923 return JNI_EINVAL;
2924 }
2925 set_mode_flags(_int); // Prevent compilation, which creates objects
2926 // -Xshare:on
2927 } else if (match_option(option, "-Xshare:on")) {
2928 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 // -Xshare:auto
2935 } else if (match_option(option, "-Xshare:auto")) {
2936 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 // -Xshare:off
2943 } else if (match_option(option, "-Xshare:off")) {
2944 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2945 return JNI_EINVAL;
2946 }
2947 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 // -Xverify
2951 } else if (match_option(option, "-Xverify", &tail)) {
2952 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2953 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2954 return JNI_EINVAL;
2955 }
2956 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2957 return JNI_EINVAL;
2958 }
2959 } else if (strcmp(tail, ":remote") == 0) {
2960 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 } else if (strcmp(tail, ":none") == 0) {
2967 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2968 return JNI_EINVAL;
2969 }
2970 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2971 return JNI_EINVAL;
2972 }
2973 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2974 return JNI_EINVAL;
2975 }
2976 // -Xdebug
2977 } else if (match_option(option, "-Xdebug")) {
2978 // note this flag has been used, then ignore
2979 set_xdebug_mode(true);
2980 // -Xnoagent
2981 } else if (match_option(option, "-Xnoagent")) {
2982 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2983 } else if (match_option(option, "-Xloggc:", &tail)) {
2984 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2985 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2986 _gc_log_filename = os::strdup_check_oom(tail);
2987 } else if (match_option(option, "-Xlog", &tail)) {
2988 bool ret = false;
2989 if (strcmp(tail, ":help") == 0) {
2990 LogConfiguration::print_command_line_help(defaultStream::output_stream());
2991 vm_exit(0);
2992 } else if (strcmp(tail, ":disable") == 0) {
2993 LogConfiguration::disable_logging();
2994 ret = true;
2995 } else if (*tail == '\0') {
2996 ret = LogConfiguration::parse_command_line_arguments();
2997 assert(ret, "-Xlog without arguments should never fail to parse");
2998 } else if (*tail == ':') {
2999 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3000 }
3001 if (ret == false) {
3002 jio_fprintf(defaultStream::error_stream(),
3003 "Invalid -Xlog option '-Xlog%s'\n",
3004 tail);
3005 return JNI_EINVAL;
3006 }
3007 // JNI hooks
3008 } else if (match_option(option, "-Xcheck", &tail)) {
3009 if (!strcmp(tail, ":jni")) {
3010 #if !INCLUDE_JNI_CHECK
3011 warning("JNI CHECKING is not supported in this VM");
3012 #else
3013 CheckJNICalls = true;
3014 #endif // INCLUDE_JNI_CHECK
3015 } else if (is_bad_option(option, args->ignoreUnrecognized,
3016 "check")) {
3017 return JNI_EINVAL;
3018 }
3019 } else if (match_option(option, "vfprintf")) {
3020 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3021 } else if (match_option(option, "exit")) {
3022 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3023 } else if (match_option(option, "abort")) {
3024 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3025 // -XX:+AggressiveHeap
3026 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3027 jint result = set_aggressive_heap_flags();
3028 if (result != JNI_OK) {
3029 return result;
3030 }
3031 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3032 // and the last option wins.
3033 } else if (match_option(option, "-XX:+NeverTenure")) {
3034 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3035 return JNI_EINVAL;
3036 }
3037 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3038 return JNI_EINVAL;
3039 }
3040 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3041 return JNI_EINVAL;
3042 }
3043 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3044 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3045 return JNI_EINVAL;
3046 }
3047 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3051 return JNI_EINVAL;
3052 }
3053 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3054 uintx max_tenuring_thresh = 0;
3055 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3056 jio_fprintf(defaultStream::error_stream(),
3057 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3058 return JNI_EINVAL;
3059 }
3060
3061 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3062 return JNI_EINVAL;
3063 }
3064
3065 if (MaxTenuringThreshold == 0) {
3066 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3067 return JNI_EINVAL;
3068 }
3069 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3070 return JNI_EINVAL;
3071 }
3072 } else {
3073 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3074 return JNI_EINVAL;
3075 }
3076 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3077 return JNI_EINVAL;
3078 }
3079 }
3080 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3081 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3082 return JNI_EINVAL;
3083 }
3084 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3085 return JNI_EINVAL;
3086 }
3087 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3088 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3089 return JNI_EINVAL;
3090 }
3091 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3092 return JNI_EINVAL;
3093 }
3094 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3095 #if defined(DTRACE_ENABLED)
3096 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3097 return JNI_EINVAL;
3098 }
3099 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3100 return JNI_EINVAL;
3101 }
3102 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3103 return JNI_EINVAL;
3104 }
3105 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3106 return JNI_EINVAL;
3107 }
3108 #else // defined(DTRACE_ENABLED)
3109 jio_fprintf(defaultStream::error_stream(),
3110 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3111 return JNI_EINVAL;
3112 #endif // defined(DTRACE_ENABLED)
3113 #ifdef ASSERT
3114 } else if (match_option(option, "-XX:+FullGCALot")) {
3115 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3116 return JNI_EINVAL;
3117 }
3118 // disable scavenge before parallel mark-compact
3119 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3120 return JNI_EINVAL;
3121 }
3122 #endif
3123 #if !INCLUDE_MANAGEMENT
3124 } else if (match_option(option, "-XX:+ManagementServer")) {
3125 jio_fprintf(defaultStream::error_stream(),
3126 "ManagementServer is not supported in this VM.\n");
3127 return JNI_ERR;
3128 #endif // INCLUDE_MANAGEMENT
3129 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3130 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3131 // already been handled
3132 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3133 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3134 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3135 return JNI_EINVAL;
3136 }
3137 }
3138 // Unknown option
3139 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3140 return JNI_ERR;
3141 }
3142 }
3143
3144 // PrintSharedArchiveAndExit will turn on
3145 // -Xshare:on
3146 // -Xlog:class+path=info
3147 if (PrintSharedArchiveAndExit) {
3148 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3149 return JNI_EINVAL;
3150 }
3151 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3152 return JNI_EINVAL;
3153 }
3154 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3155 }
3156
3157 // Change the default value for flags which have different default values
3158 // when working with older JDKs.
3159 #ifdef LINUX
3160 if (JDK_Version::current().compare_major(6) <= 0 &&
3161 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3162 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3163 }
3164 #endif // LINUX
3165 fix_appclasspath();
3166 return JNI_OK;
3167 }
3168
3169 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3170 // For java.base check for duplicate --patch-module options being specified on the command line.
3171 // This check is only required for java.base, all other duplicate module specifications
3172 // will be checked during module system initialization. The module system initialization
3173 // will throw an ExceptionInInitializerError if this situation occurs.
3174 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3175 if (*patch_mod_javabase) {
3176 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3177 } else {
3178 *patch_mod_javabase = true;
3179 }
3180 }
3181
3182 // Create GrowableArray lazily, only if --patch-module has been specified
3183 if (_patch_mod_prefix == NULL) {
3184 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3185 }
3186
3187 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3188 }
3189
3190 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3191 //
3192 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3193 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3194 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3195 // path is treated as the current directory.
3196 //
3197 // This causes problems with CDS, which requires that all directories specified in the classpath
3198 // must be empty. In most cases, applications do NOT want to load classes from the current
3199 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3200 // scripts compatible with CDS.
3201 void Arguments::fix_appclasspath() {
3202 if (IgnoreEmptyClassPaths) {
3203 const char separator = *os::path_separator();
3204 const char* src = _java_class_path->value();
3205
3206 // skip over all the leading empty paths
3207 while (*src == separator) {
3208 src ++;
3209 }
3210
3211 char* copy = os::strdup_check_oom(src, mtArguments);
3212
3213 // trim all trailing empty paths
3214 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3215 *tail = '\0';
3216 }
3217
3218 char from[3] = {separator, separator, '\0'};
3219 char to [2] = {separator, '\0'};
3220 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3221 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3222 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3223 }
3224
3225 _java_class_path->set_writeable_value(copy);
3226 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3227 }
3228 }
3229
3230 static bool has_jar_files(const char* directory) {
3231 DIR* dir = os::opendir(directory);
3232 if (dir == NULL) return false;
3233
3234 struct dirent *entry;
3235 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3236 bool hasJarFile = false;
3237 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3238 const char* name = entry->d_name;
3239 const char* ext = name + strlen(name) - 4;
3240 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3241 }
3242 FREE_C_HEAP_ARRAY(char, dbuf);
3243 os::closedir(dir);
3244 return hasJarFile ;
3245 }
3246
3247 static int check_non_empty_dirs(const char* path) {
3248 const char separator = *os::path_separator();
3249 const char* const end = path + strlen(path);
3250 int nonEmptyDirs = 0;
3251 while (path < end) {
3252 const char* tmp_end = strchr(path, separator);
3253 if (tmp_end == NULL) {
3254 if (has_jar_files(path)) {
3255 nonEmptyDirs++;
3256 jio_fprintf(defaultStream::output_stream(),
3257 "Non-empty directory: %s\n", path);
3258 }
3259 path = end;
3260 } else {
3261 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3262 memcpy(dirpath, path, tmp_end - path);
3263 dirpath[tmp_end - path] = '\0';
3264 if (has_jar_files(dirpath)) {
3265 nonEmptyDirs++;
3266 jio_fprintf(defaultStream::output_stream(),
3267 "Non-empty directory: %s\n", dirpath);
3268 }
3269 FREE_C_HEAP_ARRAY(char, dirpath);
3270 path = tmp_end + 1;
3271 }
3272 }
3273 return nonEmptyDirs;
3274 }
3275
3276 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3277 // check if the default lib/endorsed directory exists; if so, error
3278 char path[JVM_MAXPATHLEN];
3279 const char* fileSep = os::file_separator();
3280 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3281
3282 if (CheckEndorsedAndExtDirs) {
3283 int nonEmptyDirs = 0;
3284 // check endorsed directory
3285 nonEmptyDirs += check_non_empty_dirs(path);
3286 // check the extension directories
3287 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3288 if (nonEmptyDirs > 0) {
3289 return JNI_ERR;
3290 }
3291 }
3292
3293 DIR* dir = os::opendir(path);
3294 if (dir != NULL) {
3295 jio_fprintf(defaultStream::output_stream(),
3296 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3297 "in modular form will be supported via the concept of upgradeable modules.\n");
3298 os::closedir(dir);
3299 return JNI_ERR;
3300 }
3301
3302 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3303 dir = os::opendir(path);
3304 if (dir != NULL) {
3305 jio_fprintf(defaultStream::output_stream(),
3306 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3307 "Use -classpath instead.\n.");
3308 os::closedir(dir);
3309 return JNI_ERR;
3310 }
3311
3312 // This must be done after all arguments have been processed.
3313 // java_compiler() true means set to "NONE" or empty.
3314 if (java_compiler() && !xdebug_mode()) {
3315 // For backwards compatibility, we switch to interpreted mode if
3316 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3317 // not specified.
3318 set_mode_flags(_int);
3319 }
3320
3321 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3322 // but like -Xint, leave compilation thresholds unaffected.
3323 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3324 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3325 set_mode_flags(_int);
3326 }
3327
3328 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3329 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3330 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3331 }
3332
3333 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3334 // Don't degrade server performance for footprint
3335 if (FLAG_IS_DEFAULT(UseLargePages) &&
3336 MaxHeapSize < LargePageHeapSizeThreshold) {
3337 // No need for large granularity pages w/small heaps.
3338 // Note that large pages are enabled/disabled for both the
3339 // Java heap and the code cache.
3340 FLAG_SET_DEFAULT(UseLargePages, false);
3341 }
3342
3343 #elif defined(COMPILER2)
3344 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3345 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3346 }
3347 #endif
3348
3349 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3350 UNSUPPORTED_OPTION(ProfileInterpreter);
3351 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3352 #endif
3353
3354 #ifndef TIERED
3355 // Tiered compilation is undefined.
3356 UNSUPPORTED_OPTION(TieredCompilation);
3357 #endif
3358
3359 #if INCLUDE_JVMCI
3360 if (EnableJVMCI &&
3361 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3362 return JNI_ENOMEM;
3363 }
3364 #endif
3365
3366 // If we are running in a headless jre, force java.awt.headless property
3367 // to be true unless the property has already been set.
3368 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3369 if (os::is_headless_jre()) {
3370 const char* headless = Arguments::get_property("java.awt.headless");
3371 if (headless == NULL) {
3372 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3373 if (headless_env == NULL) {
3374 if (!add_property("java.awt.headless=true")) {
3375 return JNI_ENOMEM;
3376 }
3377 } else {
3378 char buffer[256];
3379 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3380 if (!add_property(buffer)) {
3381 return JNI_ENOMEM;
3382 }
3383 }
3384 }
3385 }
3386
3387 if (!check_vm_args_consistency()) {
3388 return JNI_ERR;
3389 }
3390
3391 #if INCLUDE_JVMCI
3392 if (UseJVMCICompiler) {
3393 Compilation_mode = CompMode_server;
3394 }
3395 #endif
3396
3397 #if INCLUDE_CDS
3398 if (DumpSharedSpaces) {
3399 // Disable biased locking now as it interferes with the clean up of
3400 // the archived Klasses and Java string objects (at dump time only).
3401 UseBiasedLocking = false;
3402 }
3403 if (UseSharedSpaces && patch_mod_javabase) {
3404 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3405 }
3406 #endif
3407
3408 return JNI_OK;
3409 }
3410
3411 // Helper class for controlling the lifetime of JavaVMInitArgs
3412 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3413 // deleted on the destruction of the ScopedVMInitArgs object.
3414 class ScopedVMInitArgs : public StackObj {
3415 private:
3416 JavaVMInitArgs _args;
3417 char* _container_name;
3418 bool _is_set;
3419 char* _vm_options_file_arg;
3420
3421 public:
3422 ScopedVMInitArgs(const char *container_name) {
3423 _args.version = JNI_VERSION_1_2;
3424 _args.nOptions = 0;
3425 _args.options = NULL;
3426 _args.ignoreUnrecognized = false;
3427 _container_name = (char *)container_name;
3428 _is_set = false;
3429 _vm_options_file_arg = NULL;
3430 }
3431
3432 // Populates the JavaVMInitArgs object represented by this
3433 // ScopedVMInitArgs object with the arguments in options. The
3434 // allocated memory is deleted by the destructor. If this method
3435 // returns anything other than JNI_OK, then this object is in a
3436 // partially constructed state, and should be abandoned.
3437 jint set_args(GrowableArray<JavaVMOption>* options) {
3438 _is_set = true;
3439 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3440 JavaVMOption, options->length(), mtArguments);
3441 if (options_arr == NULL) {
3442 return JNI_ENOMEM;
3443 }
3444 _args.options = options_arr;
3445
3446 for (int i = 0; i < options->length(); i++) {
3447 options_arr[i] = options->at(i);
3448 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3449 if (options_arr[i].optionString == NULL) {
3450 // Rely on the destructor to do cleanup.
3451 _args.nOptions = i;
3452 return JNI_ENOMEM;
3453 }
3454 }
3455
3456 _args.nOptions = options->length();
3457 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3458 return JNI_OK;
3459 }
3460
3461 JavaVMInitArgs* get() { return &_args; }
3462 char* container_name() { return _container_name; }
3463 bool is_set() { return _is_set; }
3464 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3465 char* vm_options_file_arg() { return _vm_options_file_arg; }
3466
3467 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3468 if (_vm_options_file_arg != NULL) {
3469 os::free(_vm_options_file_arg);
3470 }
3471 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3472 }
3473
3474 ~ScopedVMInitArgs() {
3475 if (_vm_options_file_arg != NULL) {
3476 os::free(_vm_options_file_arg);
3477 }
3478 if (_args.options == NULL) return;
3479 for (int i = 0; i < _args.nOptions; i++) {
3480 os::free(_args.options[i].optionString);
3481 }
3482 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3483 }
3484
3485 // Insert options into this option list, to replace option at
3486 // vm_options_file_pos (-XX:VMOptionsFile)
3487 jint insert(const JavaVMInitArgs* args,
3488 const JavaVMInitArgs* args_to_insert,
3489 const int vm_options_file_pos) {
3490 assert(_args.options == NULL, "shouldn't be set yet");
3491 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3492 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3493
3494 int length = args->nOptions + args_to_insert->nOptions - 1;
3495 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3496 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3497 for (int i = 0; i < args->nOptions; i++) {
3498 if (i == vm_options_file_pos) {
3499 // insert the new options starting at the same place as the
3500 // -XX:VMOptionsFile option
3501 for (int j = 0; j < args_to_insert->nOptions; j++) {
3502 options->push(args_to_insert->options[j]);
3503 }
3504 } else {
3505 options->push(args->options[i]);
3506 }
3507 }
3508 // make into options array
3509 jint result = set_args(options);
3510 delete options;
3511 return result;
3512 }
3513 };
3514
3515 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3516 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3517 }
3518
3519 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3520 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3521 }
3522
3523 jint Arguments::parse_options_environment_variable(const char* name,
3524 ScopedVMInitArgs* vm_args) {
3525 char *buffer = ::getenv(name);
3526
3527 // Don't check this environment variable if user has special privileges
3528 // (e.g. unix su command).
3529 if (buffer == NULL || os::have_special_privileges()) {
3530 return JNI_OK;
3531 }
3532
3533 if ((buffer = os::strdup(buffer)) == NULL) {
3534 return JNI_ENOMEM;
3535 }
3536
3537 jio_fprintf(defaultStream::error_stream(),
3538 "Picked up %s: %s\n", name, buffer);
3539
3540 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3541
3542 os::free(buffer);
3543 return retcode;
3544 }
3545
3546 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3547 // read file into buffer
3548 int fd = ::open(file_name, O_RDONLY);
3549 if (fd < 0) {
3550 jio_fprintf(defaultStream::error_stream(),
3551 "Could not open options file '%s'\n",
3552 file_name);
3553 return JNI_ERR;
3554 }
3555
3556 struct stat stbuf;
3557 int retcode = os::stat(file_name, &stbuf);
3558 if (retcode != 0) {
3559 jio_fprintf(defaultStream::error_stream(),
3560 "Could not stat options file '%s'\n",
3561 file_name);
3562 os::close(fd);
3563 return JNI_ERR;
3564 }
3565
3566 if (stbuf.st_size == 0) {
3567 // tell caller there is no option data and that is ok
3568 os::close(fd);
3569 return JNI_OK;
3570 }
3571
3572 // '+ 1' for NULL termination even with max bytes
3573 size_t bytes_alloc = stbuf.st_size + 1;
3574
3575 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3576 if (NULL == buf) {
3577 jio_fprintf(defaultStream::error_stream(),
3578 "Could not allocate read buffer for options file parse\n");
3579 os::close(fd);
3580 return JNI_ENOMEM;
3581 }
3582
3583 memset(buf, 0, bytes_alloc);
3584
3585 // Fill buffer
3586 // Use ::read() instead of os::read because os::read()
3587 // might do a thread state transition
3588 // and it is too early for that here
3589
3590 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3591 os::close(fd);
3592 if (bytes_read < 0) {
3593 FREE_C_HEAP_ARRAY(char, buf);
3594 jio_fprintf(defaultStream::error_stream(),
3595 "Could not read options file '%s'\n", file_name);
3596 return JNI_ERR;
3597 }
3598
3599 if (bytes_read == 0) {
3600 // tell caller there is no option data and that is ok
3601 FREE_C_HEAP_ARRAY(char, buf);
3602 return JNI_OK;
3603 }
3604
3605 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3606
3607 FREE_C_HEAP_ARRAY(char, buf);
3608 return retcode;
3609 }
3610
3611 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3612 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3613
3614 // some pointers to help with parsing
3615 char *buffer_end = buffer + buf_len;
3616 char *opt_hd = buffer;
3617 char *wrt = buffer;
3618 char *rd = buffer;
3619
3620 // parse all options
3621 while (rd < buffer_end) {
3622 // skip leading white space from the input string
3623 while (rd < buffer_end && isspace(*rd)) {
3624 rd++;
3625 }
3626
3627 if (rd >= buffer_end) {
3628 break;
3629 }
3630
3631 // Remember this is where we found the head of the token.
3632 opt_hd = wrt;
3633
3634 // Tokens are strings of non white space characters separated
3635 // by one or more white spaces.
3636 while (rd < buffer_end && !isspace(*rd)) {
3637 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3638 int quote = *rd; // matching quote to look for
3639 rd++; // don't copy open quote
3640 while (rd < buffer_end && *rd != quote) {
3641 // include everything (even spaces)
3642 // up until the close quote
3643 *wrt++ = *rd++; // copy to option string
3644 }
3645
3646 if (rd < buffer_end) {
3647 rd++; // don't copy close quote
3648 } else {
3649 // did not see closing quote
3650 jio_fprintf(defaultStream::error_stream(),
3651 "Unmatched quote in %s\n", name);
3652 delete options;
3653 return JNI_ERR;
3654 }
3655 } else {
3656 *wrt++ = *rd++; // copy to option string
3657 }
3658 }
3659
3660 // steal a white space character and set it to NULL
3661 *wrt++ = '\0';
3662 // We now have a complete token
3663
3664 JavaVMOption option;
3665 option.optionString = opt_hd;
3666 option.extraInfo = NULL;
3667
3668 options->append(option); // Fill in option
3669
3670 rd++; // Advance to next character
3671 }
3672
3673 // Fill out JavaVMInitArgs structure.
3674 jint status = vm_args->set_args(options);
3675
3676 delete options;
3677 return status;
3678 }
3679
3680 void Arguments::set_shared_spaces_flags() {
3681 if (DumpSharedSpaces) {
3682 if (FailOverToOldVerifier) {
3683 // Don't fall back to the old verifier on verification failure. If a
3684 // class fails verification with the split verifier, it might fail the
3685 // CDS runtime verifier constraint check. In that case, we don't want
3686 // to share the class. We only archive classes that pass the split verifier.
3687 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3688 }
3689
3690 if (RequireSharedSpaces) {
3691 warning("Cannot dump shared archive while using shared archive");
3692 }
3693 UseSharedSpaces = false;
3694 #ifdef _LP64
3695 if (!UseCompressedOops || !UseCompressedClassPointers) {
3696 vm_exit_during_initialization(
3697 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3698 }
3699 } else {
3700 if (!UseCompressedOops || !UseCompressedClassPointers) {
3701 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3702 }
3703 #endif
3704 }
3705 }
3706
3707 // Sharing support
3708 // Construct the path to the archive
3709 static char* get_shared_archive_path() {
3710 char *shared_archive_path;
3711 if (SharedArchiveFile == NULL) {
3712 char jvm_path[JVM_MAXPATHLEN];
3713 os::jvm_path(jvm_path, sizeof(jvm_path));
3714 char *end = strrchr(jvm_path, *os::file_separator());
3715 if (end != NULL) *end = '\0';
3716 size_t jvm_path_len = strlen(jvm_path);
3717 size_t file_sep_len = strlen(os::file_separator());
3718 const size_t len = jvm_path_len + file_sep_len + 20;
3719 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3720 if (shared_archive_path != NULL) {
3721 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3722 jvm_path, os::file_separator());
3723 }
3724 } else {
3725 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3726 }
3727 return shared_archive_path;
3728 }
3729
3730 #ifndef PRODUCT
3731 // Determine whether LogVMOutput should be implicitly turned on.
3732 static bool use_vm_log() {
3733 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3734 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3735 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3736 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3737 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3738 return true;
3739 }
3740
3741 #ifdef COMPILER1
3742 if (PrintC1Statistics) {
3743 return true;
3744 }
3745 #endif // COMPILER1
3746
3747 #ifdef COMPILER2
3748 if (PrintOptoAssembly || PrintOptoStatistics) {
3749 return true;
3750 }
3751 #endif // COMPILER2
3752
3753 return false;
3754 }
3755
3756 #endif // PRODUCT
3757
3758 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3759 for (int index = 0; index < args->nOptions; index++) {
3760 const JavaVMOption* option = args->options + index;
3761 const char* tail;
3762 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3763 return true;
3764 }
3765 }
3766 return false;
3767 }
3768
3769 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3770 const char* vm_options_file,
3771 const int vm_options_file_pos,
3772 ScopedVMInitArgs* vm_options_file_args,
3773 ScopedVMInitArgs* args_out) {
3774 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3775 if (code != JNI_OK) {
3776 return code;
3777 }
3778
3779 if (vm_options_file_args->get()->nOptions < 1) {
3780 return JNI_OK;
3781 }
3782
3783 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3784 jio_fprintf(defaultStream::error_stream(),
3785 "A VM options file may not refer to a VM options file. "
3786 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3787 "options file '%s' in options container '%s' is an error.\n",
3788 vm_options_file_args->vm_options_file_arg(),
3789 vm_options_file_args->container_name());
3790 return JNI_EINVAL;
3791 }
3792
3793 return args_out->insert(args, vm_options_file_args->get(),
3794 vm_options_file_pos);
3795 }
3796
3797 // Expand -XX:VMOptionsFile found in args_in as needed.
3798 // mod_args and args_out parameters may return values as needed.
3799 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3800 ScopedVMInitArgs* mod_args,
3801 JavaVMInitArgs** args_out) {
3802 jint code = match_special_option_and_act(args_in, mod_args);
3803 if (code != JNI_OK) {
3804 return code;
3805 }
3806
3807 if (mod_args->is_set()) {
3808 // args_in contains -XX:VMOptionsFile and mod_args contains the
3809 // original options from args_in along with the options expanded
3810 // from the VMOptionsFile. Return a short-hand to the caller.
3811 *args_out = mod_args->get();
3812 } else {
3813 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3814 }
3815 return JNI_OK;
3816 }
3817
3818 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3819 ScopedVMInitArgs* args_out) {
3820 // Remaining part of option string
3821 const char* tail;
3822 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3823
3824 for (int index = 0; index < args->nOptions; index++) {
3825 const JavaVMOption* option = args->options + index;
3826 if (ArgumentsExt::process_options(option)) {
3827 continue;
3828 }
3829 if (match_option(option, "-XX:Flags=", &tail)) {
3830 Arguments::set_jvm_flags_file(tail);
3831 continue;
3832 }
3833 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3834 if (vm_options_file_args.found_vm_options_file_arg()) {
3835 jio_fprintf(defaultStream::error_stream(),
3836 "The option '%s' is already specified in the options "
3837 "container '%s' so the specification of '%s' in the "
3838 "same options container is an error.\n",
3839 vm_options_file_args.vm_options_file_arg(),
3840 vm_options_file_args.container_name(),
3841 option->optionString);
3842 return JNI_EINVAL;
3843 }
3844 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3845 // If there's a VMOptionsFile, parse that
3846 jint code = insert_vm_options_file(args, tail, index,
3847 &vm_options_file_args, args_out);
3848 if (code != JNI_OK) {
3849 return code;
3850 }
3851 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3852 if (args_out->is_set()) {
3853 // The VMOptions file inserted some options so switch 'args'
3854 // to the new set of options, and continue processing which
3855 // preserves "last option wins" semantics.
3856 args = args_out->get();
3857 // The first option from the VMOptionsFile replaces the
3858 // current option. So we back track to process the
3859 // replacement option.
3860 index--;
3861 }
3862 continue;
3863 }
3864 if (match_option(option, "-XX:+PrintVMOptions")) {
3865 PrintVMOptions = true;
3866 continue;
3867 }
3868 if (match_option(option, "-XX:-PrintVMOptions")) {
3869 PrintVMOptions = false;
3870 continue;
3871 }
3872 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3873 IgnoreUnrecognizedVMOptions = true;
3874 continue;
3875 }
3876 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3877 IgnoreUnrecognizedVMOptions = false;
3878 continue;
3879 }
3880 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3881 CommandLineFlags::printFlags(tty, false);
3882 vm_exit(0);
3883 }
3884 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3885 #if INCLUDE_NMT
3886 // The launcher did not setup nmt environment variable properly.
3887 if (!MemTracker::check_launcher_nmt_support(tail)) {
3888 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3889 }
3890
3891 // Verify if nmt option is valid.
3892 if (MemTracker::verify_nmt_option()) {
3893 // Late initialization, still in single-threaded mode.
3894 if (MemTracker::tracking_level() >= NMT_summary) {
3895 MemTracker::init();
3896 }
3897 } else {
3898 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3899 }
3900 continue;
3901 #else
3902 jio_fprintf(defaultStream::error_stream(),
3903 "Native Memory Tracking is not supported in this VM\n");
3904 return JNI_ERR;
3905 #endif
3906 }
3907
3908 #ifndef PRODUCT
3909 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3910 CommandLineFlags::printFlags(tty, true);
3911 vm_exit(0);
3912 }
3913 #endif
3914 }
3915 return JNI_OK;
3916 }
3917
3918 static void print_options(const JavaVMInitArgs *args) {
3919 const char* tail;
3920 for (int index = 0; index < args->nOptions; index++) {
3921 const JavaVMOption *option = args->options + index;
3922 if (match_option(option, "-XX:", &tail)) {
3923 logOption(tail);
3924 }
3925 }
3926 }
3927
3928 bool Arguments::handle_deprecated_print_gc_flags() {
3929 if (PrintGC) {
3930 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3931 }
3932 if (PrintGCDetails) {
3933 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3934 }
3935
3936 if (_gc_log_filename != NULL) {
3937 // -Xloggc was used to specify a filename
3938 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3939
3940 LogTarget(Error, logging) target;
3941 LogStream errstream(target);
3942 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3943 } else if (PrintGC || PrintGCDetails) {
3944 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3945 }
3946 return true;
3947 }
3948
3949 void Arguments::handle_extra_cms_flags(const char* msg) {
3950 SpecialFlag flag;
3951 const char *flag_name = "UseConcMarkSweepGC";
3952 if (lookup_special_flag(flag_name, flag)) {
3953 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3954 warning("%s", msg);
3955 }
3956 }
3957
3958 // Parse entry point called from JNI_CreateJavaVM
3959
3960 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3961 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3962
3963 // Initialize ranges, constraints and writeables
3964 CommandLineFlagRangeList::init();
3965 CommandLineFlagConstraintList::init();
3966 CommandLineFlagWriteableList::init();
3967
3968 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3969 const char* hotspotrc = ".hotspotrc";
3970 bool settings_file_specified = false;
3971 bool needs_hotspotrc_warning = false;
3972 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3973 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3974
3975 // Pointers to current working set of containers
3976 JavaVMInitArgs* cur_cmd_args;
3977 JavaVMInitArgs* cur_java_options_args;
3978 JavaVMInitArgs* cur_java_tool_options_args;
3979
3980 // Containers for modified/expanded options
3981 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3982 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3983 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3984
3985
3986 jint code =
3987 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3988 if (code != JNI_OK) {
3989 return code;
3990 }
3991
3992 code = parse_java_options_environment_variable(&initial_java_options_args);
3993 if (code != JNI_OK) {
3994 return code;
3995 }
3996
3997 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3998 &mod_java_tool_options_args,
3999 &cur_java_tool_options_args);
4000 if (code != JNI_OK) {
4001 return code;
4002 }
4003
4004 code = expand_vm_options_as_needed(initial_cmd_args,
4005 &mod_cmd_args,
4006 &cur_cmd_args);
4007 if (code != JNI_OK) {
4008 return code;
4009 }
4010
4011 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4012 &mod_java_options_args,
4013 &cur_java_options_args);
4014 if (code != JNI_OK) {
4015 return code;
4016 }
4017
4018 const char* flags_file = Arguments::get_jvm_flags_file();
4019 settings_file_specified = (flags_file != NULL);
4020
4021 if (IgnoreUnrecognizedVMOptions) {
4022 cur_cmd_args->ignoreUnrecognized = true;
4023 cur_java_tool_options_args->ignoreUnrecognized = true;
4024 cur_java_options_args->ignoreUnrecognized = true;
4025 }
4026
4027 // Parse specified settings file
4028 if (settings_file_specified) {
4029 if (!process_settings_file(flags_file, true,
4030 cur_cmd_args->ignoreUnrecognized)) {
4031 return JNI_EINVAL;
4032 }
4033 } else {
4034 #ifdef ASSERT
4035 // Parse default .hotspotrc settings file
4036 if (!process_settings_file(".hotspotrc", false,
4037 cur_cmd_args->ignoreUnrecognized)) {
4038 return JNI_EINVAL;
4039 }
4040 #else
4041 struct stat buf;
4042 if (os::stat(hotspotrc, &buf) == 0) {
4043 needs_hotspotrc_warning = true;
4044 }
4045 #endif
4046 }
4047
4048 if (PrintVMOptions) {
4049 print_options(cur_java_tool_options_args);
4050 print_options(cur_cmd_args);
4051 print_options(cur_java_options_args);
4052 }
4053
4054 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4055 jint result = parse_vm_init_args(cur_java_tool_options_args,
4056 cur_java_options_args,
4057 cur_cmd_args);
4058
4059 if (result != JNI_OK) {
4060 return result;
4061 }
4062
4063 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4064 SharedArchivePath = get_shared_archive_path();
4065 if (SharedArchivePath == NULL) {
4066 return JNI_ENOMEM;
4067 }
4068
4069 // Set up VerifySharedSpaces
4070 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4071 VerifySharedSpaces = true;
4072 }
4073
4074 // Delay warning until here so that we've had a chance to process
4075 // the -XX:-PrintWarnings flag
4076 if (needs_hotspotrc_warning) {
4077 warning("%s file is present but has been ignored. "
4078 "Run with -XX:Flags=%s to load the file.",
4079 hotspotrc, hotspotrc);
4080 }
4081
4082 if (needs_module_property_warning) {
4083 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4084 " names that are reserved for internal use.");
4085 }
4086
4087 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4088 UNSUPPORTED_OPTION(UseLargePages);
4089 #endif
4090
4091 ArgumentsExt::report_unsupported_options();
4092
4093 #ifndef PRODUCT
4094 if (TraceBytecodesAt != 0) {
4095 TraceBytecodes = true;
4096 }
4097 if (CountCompiledCalls) {
4098 if (UseCounterDecay) {
4099 warning("UseCounterDecay disabled because CountCalls is set");
4100 UseCounterDecay = false;
4101 }
4102 }
4103 #endif // PRODUCT
4104
4105 if (ScavengeRootsInCode == 0) {
4106 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4107 warning("Forcing ScavengeRootsInCode non-zero");
4108 }
4109 ScavengeRootsInCode = 1;
4110 }
4111
4112 if (!handle_deprecated_print_gc_flags()) {
4113 return JNI_EINVAL;
4114 }
4115
4116 // Set object alignment values.
4117 set_object_alignment();
4118
4119 #if !INCLUDE_CDS
4120 if (DumpSharedSpaces || RequireSharedSpaces) {
4121 jio_fprintf(defaultStream::error_stream(),
4122 "Shared spaces are not supported in this VM\n");
4123 return JNI_ERR;
4124 }
4125 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4126 log_is_enabled(Info, cds)) {
4127 warning("Shared spaces are not supported in this VM");
4128 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4129 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4130 }
4131 no_shared_spaces("CDS Disabled");
4132 #endif // INCLUDE_CDS
4133
4134 return JNI_OK;
4135 }
4136
4137 jint Arguments::apply_ergo() {
4138 // Set flags based on ergonomics.
4139 jint result = set_ergonomics_flags();
4140 if (result != JNI_OK) return result;
4141
4142 #if INCLUDE_JVMCI
4143 set_jvmci_specific_flags();
4144 #endif
4145
4146 set_shared_spaces_flags();
4147
4148 // Check the GC selections again.
4149 if (!check_gc_consistency()) {
4150 return JNI_EINVAL;
4151 }
4152
4153 if (TieredCompilation) {
4154 set_tiered_flags();
4155 } else {
4156 int max_compilation_policy_choice = 1;
4157 #ifdef COMPILER2
4158 if (is_server_compilation_mode_vm()) {
4159 max_compilation_policy_choice = 2;
4160 }
4161 #endif
4162 // Check if the policy is valid.
4163 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4164 vm_exit_during_initialization(
4165 "Incompatible compilation policy selected", NULL);
4166 }
4167 // Scale CompileThreshold
4168 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4169 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4170 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4171 }
4172 }
4173
4174 #ifdef COMPILER2
4175 #ifndef PRODUCT
4176 if (PrintIdealGraphLevel > 0) {
4177 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4178 }
4179 #endif
4180 #endif
4181
4182 // Set heap size based on available physical memory
4183 set_heap_size();
4184
4185 ArgumentsExt::set_gc_specific_flags();
4186
4187 // Initialize Metaspace flags and alignments
4188 Metaspace::ergo_initialize();
4189
4190 // Set bytecode rewriting flags
4191 set_bytecode_flags();
4192
4193 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4194 jint code = set_aggressive_opts_flags();
4195 if (code != JNI_OK) {
4196 return code;
4197 }
4198
4199 // Turn off biased locking for locking debug mode flags,
4200 // which are subtly different from each other but neither works with
4201 // biased locking
4202 if (UseHeavyMonitors
4203 #ifdef COMPILER1
4204 || !UseFastLocking
4205 #endif // COMPILER1
4206 #if INCLUDE_JVMCI
4207 || !JVMCIUseFastLocking
4208 #endif
4209 ) {
4210 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4211 // flag set to true on command line; warn the user that they
4212 // can't enable biased locking here
4213 warning("Biased Locking is not supported with locking debug flags"
4214 "; ignoring UseBiasedLocking flag." );
4215 }
4216 UseBiasedLocking = false;
4217 }
4218
4219 #ifdef CC_INTERP
4220 // Clear flags not supported on zero.
4221 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4222 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4223 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4224 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4225 #endif // CC_INTERP
4226
4227 #ifdef COMPILER2
4228 if (!EliminateLocks) {
4229 EliminateNestedLocks = false;
4230 }
4231 if (!Inline) {
4232 IncrementalInline = false;
4233 }
4234 #ifndef PRODUCT
4235 if (!IncrementalInline) {
4236 AlwaysIncrementalInline = false;
4237 }
4238 #endif
4239 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4240 // nothing to use the profiling, turn if off
4241 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4242 }
4243 #endif
4244
4245 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4246 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4247 DebugNonSafepoints = true;
4248 }
4249
4250 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4251 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4252 }
4253
4254 if (UseOnStackReplacement && !UseLoopCounter) {
4255 warning("On-stack-replacement requires loop counters; enabling loop counters");
4256 FLAG_SET_DEFAULT(UseLoopCounter, true);
4257 }
4258
4259 #ifndef PRODUCT
4260 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4261 if (use_vm_log()) {
4262 LogVMOutput = true;
4263 }
4264 }
4265 #endif // PRODUCT
4266
4267 if (PrintCommandLineFlags) {
4268 CommandLineFlags::printSetFlags(tty);
4269 }
4270
4271 // Apply CPU specific policy for the BiasedLocking
4272 if (UseBiasedLocking) {
4273 if (!VM_Version::use_biased_locking() &&
4274 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4275 UseBiasedLocking = false;
4276 }
4277 }
4278 #ifdef COMPILER2
4279 if (!UseBiasedLocking || EmitSync != 0) {
4280 UseOptoBiasInlining = false;
4281 }
4282 #endif
4283
4284 return JNI_OK;
4285 }
4286
4287 jint Arguments::adjust_after_os() {
4288 if (UseNUMA) {
4289 if (UseParallelGC || UseParallelOldGC) {
4290 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4291 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4292 }
4293 }
4294 // UseNUMAInterleaving is set to ON for all collectors and
4295 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4296 // such as the parallel collector for Linux and Solaris will
4297 // interleave old gen and survivor spaces on top of NUMA
4298 // allocation policy for the eden space.
4299 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4300 // all platforms and ParallelGC on Windows will interleave all
4301 // of the heap spaces across NUMA nodes.
4302 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4303 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4304 }
4305 }
4306 return JNI_OK;
4307 }
4308
4309 int Arguments::PropertyList_count(SystemProperty* pl) {
4310 int count = 0;
4311 while(pl != NULL) {
4312 count++;
4313 pl = pl->next();
4314 }
4315 return count;
4316 }
4317
4318 // Return the number of readable properties.
4319 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4320 int count = 0;
4321 while(pl != NULL) {
4322 if (pl->is_readable()) {
4323 count++;
4324 }
4325 pl = pl->next();
4326 }
4327 return count;
4328 }
4329
4330 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4331 assert(key != NULL, "just checking");
4332 SystemProperty* prop;
4333 for (prop = pl; prop != NULL; prop = prop->next()) {
4334 if (strcmp(key, prop->key()) == 0) return prop->value();
4335 }
4336 return NULL;
4337 }
4338
4339 // Return the value of the requested property provided that it is a readable property.
4340 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4341 assert(key != NULL, "just checking");
4342 SystemProperty* prop;
4343 // Return the property value if the keys match and the property is not internal or
4344 // it's the special internal property "jdk.boot.class.path.append".
4345 for (prop = pl; prop != NULL; prop = prop->next()) {
4346 if (strcmp(key, prop->key()) == 0) {
4347 if (!prop->internal()) {
4348 return prop->value();
4349 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4350 return prop->value();
4351 } else {
4352 // Property is internal and not jdk.boot.class.path.append so return NULL.
4353 return NULL;
4354 }
4355 }
4356 }
4357 return NULL;
4358 }
4359
4360 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4361 int count = 0;
4362 const char* ret_val = NULL;
4363
4364 while(pl != NULL) {
4365 if(count >= index) {
4366 ret_val = pl->key();
4367 break;
4368 }
4369 count++;
4370 pl = pl->next();
4371 }
4372
4373 return ret_val;
4374 }
4375
4376 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4377 int count = 0;
4378 char* ret_val = NULL;
4379
4380 while(pl != NULL) {
4381 if(count >= index) {
4382 ret_val = pl->value();
4383 break;
4384 }
4385 count++;
4386 pl = pl->next();
4387 }
4388
4389 return ret_val;
4390 }
4391
4392 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4393 SystemProperty* p = *plist;
4394 if (p == NULL) {
4395 *plist = new_p;
4396 } else {
4397 while (p->next() != NULL) {
4398 p = p->next();
4399 }
4400 p->set_next(new_p);
4401 }
4402 }
4403
4404 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4405 bool writeable, bool internal) {
4406 if (plist == NULL)
4407 return;
4408
4409 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4410 PropertyList_add(plist, new_p);
4411 }
4412
4413 void Arguments::PropertyList_add(SystemProperty *element) {
4414 PropertyList_add(&_system_properties, element);
4415 }
4416
4417 // This add maintains unique property key in the list.
4418 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4419 PropertyAppendable append, PropertyWriteable writeable,
4420 PropertyInternal internal) {
4421 if (plist == NULL)
4422 return;
4423
4424 // If property key exist then update with new value.
4425 SystemProperty* prop;
4426 for (prop = *plist; prop != NULL; prop = prop->next()) {
4427 if (strcmp(k, prop->key()) == 0) {
4428 if (append == AppendProperty) {
4429 prop->append_value(v);
4430 } else {
4431 prop->set_value(v);
4432 }
4433 return;
4434 }
4435 }
4436
4437 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4438 }
4439
4440 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4441 // Returns true if all of the source pointed by src has been copied over to
4442 // the destination buffer pointed by buf. Otherwise, returns false.
4443 // Notes:
4444 // 1. If the length (buflen) of the destination buffer excluding the
4445 // NULL terminator character is not long enough for holding the expanded
4446 // pid characters, it also returns false instead of returning the partially
4447 // expanded one.
4448 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4449 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4450 char* buf, size_t buflen) {
4451 const char* p = src;
4452 char* b = buf;
4453 const char* src_end = &src[srclen];
4454 char* buf_end = &buf[buflen - 1];
4455
4456 while (p < src_end && b < buf_end) {
4457 if (*p == '%') {
4458 switch (*(++p)) {
4459 case '%': // "%%" ==> "%"
4460 *b++ = *p++;
4461 break;
4462 case 'p': { // "%p" ==> current process id
4463 // buf_end points to the character before the last character so
4464 // that we could write '\0' to the end of the buffer.
4465 size_t buf_sz = buf_end - b + 1;
4466 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4467
4468 // if jio_snprintf fails or the buffer is not long enough to hold
4469 // the expanded pid, returns false.
4470 if (ret < 0 || ret >= (int)buf_sz) {
4471 return false;
4472 } else {
4473 b += ret;
4474 assert(*b == '\0', "fail in copy_expand_pid");
4475 if (p == src_end && b == buf_end + 1) {
4476 // reach the end of the buffer.
4477 return true;
4478 }
4479 }
4480 p++;
4481 break;
4482 }
4483 default :
4484 *b++ = '%';
4485 }
4486 } else {
4487 *b++ = *p++;
4488 }
4489 }
4490 *b = '\0';
4491 return (p == src_end); // return false if not all of the source was copied
4492 }