1 /*
2 * Copyright (c) 1997, 2018, 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/collectorPolicy.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/arguments_ext.hpp"
45 #include "runtime/flags/jvmFlag.hpp"
46 #include "runtime/flags/jvmFlagConstraintList.hpp"
47 #include "runtime/flags/jvmFlagWriteableList.hpp"
48 #include "runtime/flags/jvmFlagRangeList.hpp"
49 #include "runtime/globals_extension.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.inline.hpp"
52 #include "runtime/safepoint.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64 #if INCLUDE_JFR
65 #include "jfr/jfr.hpp"
66 #endif
67
68 // Note: This is a special bug reporting site for the JVM
69 #ifdef VENDOR_URL_VM_BUG
70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
71 #else
72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
73 #endif
74 #define DEFAULT_JAVA_LAUNCHER "generic"
75
76 char* Arguments::_jvm_flags_file = NULL;
77 char** Arguments::_jvm_flags_array = NULL;
78 int Arguments::_num_jvm_flags = 0;
79 char** Arguments::_jvm_args_array = NULL;
80 int Arguments::_num_jvm_args = 0;
81 char* Arguments::_java_command = NULL;
82 SystemProperty* Arguments::_system_properties = NULL;
83 const char* Arguments::_gc_log_filename = NULL;
84 size_t Arguments::_conservative_max_heap_alignment = 0;
85 size_t Arguments::_min_heap_size = 0;
86 Arguments::Mode Arguments::_mode = _mixed;
87 bool Arguments::_java_compiler = false;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 int Arguments::_sun_java_launcher_pid = -1;
92 bool Arguments::_sun_java_launcher_is_altjvm = false;
93
94 // These parameters are reset in method parse_vm_init_args()
95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
97 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
98 bool Arguments::_ClipInlining = ClipInlining;
99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
101
102 bool Arguments::_enable_preview = false;
103
104 char* Arguments::SharedArchivePath = NULL;
105
106 AgentLibraryList Arguments::_libraryList;
107 AgentLibraryList Arguments::_agentList;
108
109 // These are not set by the JDK's built-in launchers, but they can be set by
110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
111 // JavaVMOption in jni.h.
112 abort_hook_t Arguments::_abort_hook = NULL;
113 exit_hook_t Arguments::_exit_hook = NULL;
114 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
115
116
117 SystemProperty *Arguments::_sun_boot_library_path = NULL;
118 SystemProperty *Arguments::_java_library_path = NULL;
119 SystemProperty *Arguments::_java_home = NULL;
120 SystemProperty *Arguments::_java_class_path = NULL;
121 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
122 SystemProperty *Arguments::_vm_info = NULL;
123
124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
125 PathString *Arguments::_system_boot_class_path = NULL;
126 bool Arguments::_has_jimage = false;
127
128 char* Arguments::_ext_dirs = NULL;
129
130 bool PathString::set_value(const char *value) {
131 if (_value != NULL) {
132 FreeHeap(_value);
133 }
134 _value = AllocateHeap(strlen(value)+1, mtArguments);
135 assert(_value != NULL, "Unable to allocate space for new path value");
136 if (_value != NULL) {
137 strcpy(_value, value);
138 } else {
139 // not able to allocate
140 return false;
141 }
142 return true;
143 }
144
145 void PathString::append_value(const char *value) {
146 char *sp;
147 size_t len = 0;
148 if (value != NULL) {
149 len = strlen(value);
150 if (_value != NULL) {
151 len += strlen(_value);
152 }
153 sp = AllocateHeap(len+2, mtArguments);
154 assert(sp != NULL, "Unable to allocate space for new append path value");
155 if (sp != NULL) {
156 if (_value != NULL) {
157 strcpy(sp, _value);
158 strcat(sp, os::path_separator());
159 strcat(sp, value);
160 FreeHeap(_value);
161 } else {
162 strcpy(sp, value);
163 }
164 _value = sp;
165 }
166 }
167 }
168
169 PathString::PathString(const char* value) {
170 if (value == NULL) {
171 _value = NULL;
172 } else {
173 _value = AllocateHeap(strlen(value)+1, mtArguments);
174 strcpy(_value, value);
175 }
176 }
177
178 PathString::~PathString() {
179 if (_value != NULL) {
180 FreeHeap(_value);
181 _value = NULL;
182 }
183 }
184
185 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
186 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
187 size_t len = strlen(module_name) + 1;
188 _module_name = AllocateHeap(len, mtInternal);
189 strncpy(_module_name, module_name, len); // copy the trailing null
190 _path = new PathString(path);
191 }
192
193 ModulePatchPath::~ModulePatchPath() {
194 if (_module_name != NULL) {
195 FreeHeap(_module_name);
196 _module_name = NULL;
197 }
198 if (_path != NULL) {
199 delete _path;
200 _path = NULL;
201 }
202 }
203
204 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
205 if (key == NULL) {
206 _key = NULL;
207 } else {
208 _key = AllocateHeap(strlen(key)+1, mtArguments);
209 strcpy(_key, key);
210 }
211 _next = NULL;
212 _internal = internal;
213 _writeable = writeable;
214 }
215
216 AgentLibrary::AgentLibrary(const char* name, const char* options,
217 bool is_absolute_path, void* os_lib,
218 bool instrument_lib) {
219 _name = AllocateHeap(strlen(name)+1, mtArguments);
220 strcpy(_name, name);
221 if (options == NULL) {
222 _options = NULL;
223 } else {
224 _options = AllocateHeap(strlen(options)+1, mtArguments);
225 strcpy(_options, options);
226 }
227 _is_absolute_path = is_absolute_path;
228 _os_lib = os_lib;
229 _next = NULL;
230 _state = agent_invalid;
231 _is_static_lib = false;
232 _is_instrument_lib = instrument_lib;
233 }
234
235 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
236 // part of the option string.
237 static bool match_option(const JavaVMOption *option, const char* name,
238 const char** tail) {
239 size_t len = strlen(name);
240 if (strncmp(option->optionString, name, len) == 0) {
241 *tail = option->optionString + len;
242 return true;
243 } else {
244 return false;
245 }
246 }
247
248 // Check if 'option' matches 'name'. No "tail" is allowed.
249 static bool match_option(const JavaVMOption *option, const char* name) {
250 const char* tail = NULL;
251 bool result = match_option(option, name, &tail);
252 if (tail != NULL && *tail == '\0') {
253 return result;
254 } else {
255 return false;
256 }
257 }
258
259 // Return true if any of the strings in null-terminated array 'names' matches.
260 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
261 // the option must match exactly.
262 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
263 bool tail_allowed) {
264 for (/* empty */; *names != NULL; ++names) {
265 if (match_option(option, *names, tail)) {
266 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
267 return true;
268 }
269 }
270 }
271 return false;
272 }
273
274 #if INCLUDE_JFR
275 // return true on failure
276 static bool match_jfr_option(const JavaVMOption** option) {
277 assert((*option)->optionString != NULL, "invariant");
278 char* tail = NULL;
279 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
280 return Jfr::on_start_flight_recording_option(option, tail);
281 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
282 return Jfr::on_flight_recorder_option(option, tail);
283 }
284 return false;
285 }
286 #endif
287
288 static void logOption(const char* opt) {
289 if (PrintVMOptions) {
290 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
291 }
292 }
293
294 bool needs_module_property_warning = false;
295
296 #define MODULE_PROPERTY_PREFIX "jdk.module."
297 #define MODULE_PROPERTY_PREFIX_LEN 11
298 #define ADDEXPORTS "addexports"
299 #define ADDEXPORTS_LEN 10
300 #define ADDREADS "addreads"
301 #define ADDREADS_LEN 8
302 #define ADDOPENS "addopens"
303 #define ADDOPENS_LEN 8
304 #define PATCH "patch"
305 #define PATCH_LEN 5
306 #define ADDMODS "addmods"
307 #define ADDMODS_LEN 7
308 #define LIMITMODS "limitmods"
309 #define LIMITMODS_LEN 9
310 #define PATH "path"
311 #define PATH_LEN 4
312 #define UPGRADE_PATH "upgrade.path"
313 #define UPGRADE_PATH_LEN 12
314
315 void Arguments::add_init_library(const char* name, char* options) {
316 _libraryList.add(new AgentLibrary(name, options, false, NULL));
317 }
318
319 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
320 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
321 }
322
323 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
324 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
325 }
326
327 // Late-binding agents not started via arguments
328 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
329 _agentList.add(agentLib);
330 }
331
332 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
333 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
334 }
335
336 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
337 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
338 return ((strncmp(option, property, len) == 0) &&
339 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
340 }
341
342 // Return true if property starts with "jdk.module." and its ensuing chars match
343 // any of the reserved module properties.
344 // property should be passed without the leading "-D".
345 bool Arguments::is_internal_module_property(const char* property) {
346 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
347 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
348 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
349 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
350 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
351 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
352 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
353 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
354 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
355 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
356 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
357 return true;
358 }
359 }
360 return false;
361 }
362
363 // Process java launcher properties.
364 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
365 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
366 // sun.java.launcher.pid is defined.
367 // Must do this before setting up other system properties,
368 // as some of them may depend on launcher type.
369 for (int index = 0; index < args->nOptions; index++) {
370 const JavaVMOption* option = args->options + index;
371 const char* tail;
372
373 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
374 process_java_launcher_argument(tail, option->extraInfo);
375 continue;
376 }
377 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
378 if (strcmp(tail, "true") == 0) {
379 _sun_java_launcher_is_altjvm = true;
380 }
381 continue;
382 }
383 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
384 _sun_java_launcher_pid = atoi(tail);
385 continue;
386 }
387 }
388 }
389
390 // Initialize system properties key and value.
391 void Arguments::init_system_properties() {
392
393 // Set up _system_boot_class_path which is not a property but
394 // relies heavily on argument processing and the jdk.boot.class.path.append
395 // property. It is used to store the underlying system boot class path.
396 _system_boot_class_path = new PathString(NULL);
397
398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
399 "Java Virtual Machine Specification", false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
402 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
403
404 // Initialize the vm.info now, but it will need updating after argument parsing.
405 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
406
407 // Following are JVMTI agent writable properties.
408 // Properties values are set to NULL and they are
409 // os specific they are initialized in os::init_system_properties_values().
410 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
411 _java_library_path = new SystemProperty("java.library.path", NULL, true);
412 _java_home = new SystemProperty("java.home", NULL, true);
413 _java_class_path = new SystemProperty("java.class.path", "", true);
414 // jdk.boot.class.path.append is a non-writeable, internal property.
415 // It can only be set by either:
416 // - -Xbootclasspath/a:
417 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
418 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
419
420 // Add to System Property list.
421 PropertyList_add(&_system_properties, _sun_boot_library_path);
422 PropertyList_add(&_system_properties, _java_library_path);
423 PropertyList_add(&_system_properties, _java_home);
424 PropertyList_add(&_system_properties, _java_class_path);
425 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
426 PropertyList_add(&_system_properties, _vm_info);
427
428 // Set OS specific system properties values
429 os::init_system_properties_values();
430 }
431
432 // Update/Initialize System properties after JDK version number is known
433 void Arguments::init_version_specific_system_properties() {
434 enum { bufsz = 16 };
435 char buffer[bufsz];
436 const char* spec_vendor = "Oracle Corporation";
437 uint32_t spec_version = JDK_Version::current().major_version();
438
439 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
440
441 PropertyList_add(&_system_properties,
442 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
443 PropertyList_add(&_system_properties,
444 new SystemProperty("java.vm.specification.version", buffer, false));
445 PropertyList_add(&_system_properties,
446 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
447 }
448
449 /*
450 * -XX argument processing:
451 *
452 * -XX arguments are defined in several places, such as:
453 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
454 * -XX arguments are parsed in parse_argument().
455 * -XX argument bounds checking is done in check_vm_args_consistency().
456 *
457 * Over time -XX arguments may change. There are mechanisms to handle common cases:
458 *
459 * ALIASED: An option that is simply another name for another option. This is often
460 * part of the process of deprecating a flag, but not all aliases need
461 * to be deprecated.
462 *
463 * Create an alias for an option by adding the old and new option names to the
464 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
465 *
466 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
467 * support may be removed in the future. Both regular and aliased options may be
468 * deprecated.
469 *
470 * Add a deprecation warning for an option (or alias) by adding an entry in the
471 * "special_jvm_flags" table and setting the "deprecated_in" field.
472 * Often an option "deprecated" in one major release will
473 * be made "obsolete" in the next. In this case the entry should also have its
474 * "obsolete_in" field set.
475 *
476 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
477 * on the command line. A warning is printed to let the user know that option might not
478 * be accepted in the future.
479 *
480 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
481 * table and setting the "obsolete_in" field.
482 *
483 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
484 * to the current JDK version. The system will flatly refuse to admit the existence of
485 * the flag. This allows a flag to die automatically over JDK releases.
486 *
487 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
488 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
489 * - Newly obsolete or expired deprecated options should have their global variable
490 * definitions removed (from globals.hpp, etc) and related implementations removed.
491 *
492 * Recommended approach for removing options:
493 *
494 * To remove options commonly used by customers (e.g. product -XX options), use
495 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
496 *
497 * To remove internal options (e.g. diagnostic, experimental, develop options), use
498 * a 2-step model adding major release numbers to the obsolete and expire columns.
499 *
500 * To change the name of an option, use the alias table as well as a 2-step
501 * model adding major release numbers to the deprecate and expire columns.
502 * Think twice about aliasing commonly used customer options.
503 *
504 * There are times when it is appropriate to leave a future release number as undefined.
505 *
506 * Tests: Aliases should be tested in VMAliasOptions.java.
507 * Deprecated options should be tested in VMDeprecatedOptions.java.
508 */
509
510 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
511 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
512 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
513 // the command-line as usual, but will issue a warning.
514 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
515 // the command-line, while issuing a warning and ignoring the flag value.
516 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
517 // existence of the flag.
518 //
519 // MANUAL CLEANUP ON JDK VERSION UPDATES:
520 // This table ensures that the handling of options will update automatically when the JDK
521 // version is incremented, but the source code needs to be cleanup up manually:
522 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
523 // variable should be removed, as well as users of the variable.
524 // - As "deprecated" options age into "obsolete" options, move the entry into the
525 // "Obsolete Flags" section of the table.
526 // - All expired options should be removed from the table.
527 static SpecialFlag const special_jvm_flags[] = {
528 // -------------- Deprecated Flags --------------
529 // --- Non-alias flags - sorted by obsolete_in then expired_in:
530 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
536 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
537 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
538 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
539
540 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
541 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
542 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
543 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
544
545 // -------------- Obsolete Flags - sorted by expired_in --------------
546 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
547 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
548 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
549 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
550 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
551 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
552 { "AssumeMP", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::jdk(13) },
553 { "UnlinkSymbolsALot", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
554 { "AllowNonVirtualCalls", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
555 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
556 { "PrintSafepointStatisticsTimeout",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
557 { "PrintSafepointStatisticsCount", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
558 { "TransmitErrorReport", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
559 { "ErrorReportServer", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
560 { "EmitSync", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
561 { "SyncVerbose", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
562 { "SyncFlags", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
563 { "SyncKnobs", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) },
564 { "MonitorInUseLists", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::jdk(13) },
565 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
566
567 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
568 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
569 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
570 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
571 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
572 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
573 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
574 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
575 #endif
576
577 { NULL, JDK_Version(0), JDK_Version(0) }
578 };
579
580 // Flags that are aliases for other flags.
581 typedef struct {
582 const char* alias_name;
583 const char* real_name;
584 } AliasedFlag;
585
586 static AliasedFlag const aliased_jvm_flags[] = {
587 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
588 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
589 { NULL, NULL}
590 };
591
592 // NOTE: A compatibility request will be necessary for each alias to be removed.
593 static AliasedLoggingFlag const aliased_logging_flags[] = {
594 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
595 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
596 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
597 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
598 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
599 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
600 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
601 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
602 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
603 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
604 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
605 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
606 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
607 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
608 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
609 };
610
611 #ifndef PRODUCT
612 // These options are removed in jdk9. Remove this code for jdk10.
613 static AliasedFlag const removed_develop_logging_flags[] = {
614 { "TraceClassInitialization", "-Xlog:class+init" },
615 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
616 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
617 { "TraceItables", "-Xlog:itables=debug" },
618 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
619 { "TraceSafepoint", "-Xlog:safepoint=debug" },
620 { "TraceStartupTime", "-Xlog:startuptime" },
621 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
622 { "PrintVtables", "-Xlog:vtables=debug" },
623 { "VerboseVerification", "-Xlog:verification" },
624 { NULL, NULL }
625 };
626 #endif //PRODUCT
627
628 // Return true if "v" is less than "other", where "other" may be "undefined".
629 static bool version_less_than(JDK_Version v, JDK_Version other) {
630 assert(!v.is_undefined(), "must be defined");
631 if (!other.is_undefined() && v.compare(other) >= 0) {
632 return false;
633 } else {
634 return true;
635 }
636 }
637
638 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
639
640 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
641 // Allow extensions to have priority
642 if (lookup_special_flag_ext(flag_name, flag)) {
643 return true;
644 }
645
646 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
647 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
648 flag = special_jvm_flags[i];
649 return true;
650 }
651 }
652 return false;
653 }
654
655 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
656 assert(version != NULL, "Must provide a version buffer");
657 SpecialFlag flag;
658 if (lookup_special_flag(flag_name, flag)) {
659 if (!flag.obsolete_in.is_undefined()) {
660 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
661 *version = flag.obsolete_in;
662 return true;
663 }
664 }
665 }
666 return false;
667 }
668
669 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
670 assert(version != NULL, "Must provide a version buffer");
671 SpecialFlag flag;
672 if (lookup_special_flag(flag_name, flag)) {
673 if (!flag.deprecated_in.is_undefined()) {
674 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
675 version_less_than(JDK_Version::current(), flag.expired_in)) {
676 *version = flag.deprecated_in;
677 return 1;
678 } else {
679 return -1;
680 }
681 }
682 }
683 return 0;
684 }
685
686 #ifndef PRODUCT
687 const char* Arguments::removed_develop_logging_flag_name(const char* name){
688 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
689 const AliasedFlag& flag = removed_develop_logging_flags[i];
690 if (strcmp(flag.alias_name, name) == 0) {
691 return flag.real_name;
692 }
693 }
694 return NULL;
695 }
696 #endif // PRODUCT
697
698 const char* Arguments::real_flag_name(const char *flag_name) {
699 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
700 const AliasedFlag& flag_status = aliased_jvm_flags[i];
701 if (strcmp(flag_status.alias_name, flag_name) == 0) {
702 return flag_status.real_name;
703 }
704 }
705 return flag_name;
706 }
707
708 #ifdef ASSERT
709 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
710 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
711 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
712 return true;
713 }
714 }
715 return false;
716 }
717
718 // Verifies the correctness of the entries in the special_jvm_flags table.
719 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
720 // version being earlier than the deprecation version, then a warning is issued
721 // and verification fails - by returning false. If it is detected that the table
722 // is out of date, with respect to the current version, then a warning is issued
723 // but verification does not fail. This allows the VM to operate when the version
724 // is first updated, without needing to update all the impacted flags at the
725 // same time.
726 static bool verify_special_jvm_flags() {
727 bool success = true;
728 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
729 const SpecialFlag& flag = special_jvm_flags[i];
730 if (lookup_special_flag(flag.name, i)) {
731 warning("Duplicate special flag declaration \"%s\"", flag.name);
732 success = false;
733 }
734 if (flag.deprecated_in.is_undefined() &&
735 flag.obsolete_in.is_undefined()) {
736 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
737 success = false;
738 }
739
740 if (!flag.deprecated_in.is_undefined()) {
741 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
742 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
743 success = false;
744 }
745
746 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
747 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
748 success = false;
749 }
750 }
751
752 if (!flag.obsolete_in.is_undefined()) {
753 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
754 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
755 success = false;
756 }
757
758 // if flag has become obsolete it should not have a "globals" flag defined anymore.
759 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
760 if (JVMFlag::find_flag(flag.name) != NULL) {
761 // Temporarily disable the warning: 8196739
762 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
763 }
764 }
765 }
766
767 if (!flag.expired_in.is_undefined()) {
768 // if flag has become expired it should not have a "globals" flag defined anymore.
769 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
770 if (JVMFlag::find_flag(flag.name) != NULL) {
771 // Temporarily disable the warning: 8196739
772 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
773 }
774 }
775 }
776
777 }
778 return success;
779 }
780 #endif
781
782 // Parses a size specification string.
783 bool Arguments::atojulong(const char *s, julong* result) {
784 julong n = 0;
785
786 // First char must be a digit. Don't allow negative numbers or leading spaces.
787 if (!isdigit(*s)) {
788 return false;
789 }
790
791 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
792 char* remainder;
793 errno = 0;
794 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
795 if (errno != 0) {
796 return false;
797 }
798
799 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
800 if (remainder == s || strlen(remainder) > 1) {
801 return false;
802 }
803
804 switch (*remainder) {
805 case 'T': case 't':
806 *result = n * G * K;
807 // Check for overflow.
808 if (*result/((julong)G * K) != n) return false;
809 return true;
810 case 'G': case 'g':
811 *result = n * G;
812 if (*result/G != n) return false;
813 return true;
814 case 'M': case 'm':
815 *result = n * M;
816 if (*result/M != n) return false;
817 return true;
818 case 'K': case 'k':
819 *result = n * K;
820 if (*result/K != n) return false;
821 return true;
822 case '\0':
823 *result = n;
824 return true;
825 default:
826 return false;
827 }
828 }
829
830 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
831 if (size < min_size) return arg_too_small;
832 if (size > max_size) return arg_too_big;
833 return arg_in_range;
834 }
835
836 // Describe an argument out of range error
837 void Arguments::describe_range_error(ArgsRange errcode) {
838 switch(errcode) {
839 case arg_too_big:
840 jio_fprintf(defaultStream::error_stream(),
841 "The specified size exceeds the maximum "
842 "representable size.\n");
843 break;
844 case arg_too_small:
845 case arg_unreadable:
846 case arg_in_range:
847 // do nothing for now
848 break;
849 default:
850 ShouldNotReachHere();
851 }
852 }
853
854 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
855 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
856 return true;
857 } else {
858 return false;
859 }
860 }
861
862 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
863 char* end;
864 errno = 0;
865 double v = strtod(value, &end);
866 if ((errno != 0) || (*end != 0)) {
867 return false;
868 }
869
870 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
871 return true;
872 }
873 return false;
874 }
875
876 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
877 julong v;
878 int int_v;
879 intx intx_v;
880 bool is_neg = false;
881 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
882
883 if (result == NULL) {
884 return false;
885 }
886
887 // Check the sign first since atojulong() parses only unsigned values.
888 if (*value == '-') {
889 if (!result->is_intx() && !result->is_int()) {
890 return false;
891 }
892 value++;
893 is_neg = true;
894 }
895 if (!Arguments::atojulong(value, &v)) {
896 return false;
897 }
898 if (result->is_int()) {
899 int_v = (int) v;
900 if (is_neg) {
901 int_v = -int_v;
902 }
903 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
904 } else if (result->is_uint()) {
905 uint uint_v = (uint) v;
906 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
907 } else if (result->is_intx()) {
908 intx_v = (intx) v;
909 if (is_neg) {
910 intx_v = -intx_v;
911 }
912 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
913 } else if (result->is_uintx()) {
914 uintx uintx_v = (uintx) v;
915 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
916 } else if (result->is_uint64_t()) {
917 uint64_t uint64_t_v = (uint64_t) v;
918 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
919 } else if (result->is_size_t()) {
920 size_t size_t_v = (size_t) v;
921 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
922 } else if (result->is_double()) {
923 double double_v = (double) v;
924 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
925 } else {
926 return false;
927 }
928 }
929
930 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
931 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
932 // Contract: JVMFlag always returns a pointer that needs freeing.
933 FREE_C_HEAP_ARRAY(char, value);
934 return true;
935 }
936
937 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
938 const char* old_value = "";
939 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
940 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
941 size_t new_len = strlen(new_value);
942 const char* value;
943 char* free_this_too = NULL;
944 if (old_len == 0) {
945 value = new_value;
946 } else if (new_len == 0) {
947 value = old_value;
948 } else {
949 size_t length = old_len + 1 + new_len + 1;
950 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
951 // each new setting adds another LINE to the switch:
952 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
953 value = buf;
954 free_this_too = buf;
955 }
956 (void) JVMFlag::ccstrAtPut(name, &value, origin);
957 // JVMFlag always returns a pointer that needs freeing.
958 FREE_C_HEAP_ARRAY(char, value);
959 if (free_this_too != NULL) {
960 // JVMFlag made its own copy, so I must delete my own temp. buffer.
961 FREE_C_HEAP_ARRAY(char, free_this_too);
962 }
963 return true;
964 }
965
966 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
967 const char* real_name = real_flag_name(arg);
968 JDK_Version since = JDK_Version();
969 switch (is_deprecated_flag(arg, &since)) {
970 case -1:
971 return NULL; // obsolete or expired, don't process normally
972 case 0:
973 return real_name;
974 case 1: {
975 if (warn) {
976 char version[256];
977 since.to_string(version, sizeof(version));
978 if (real_name != arg) {
979 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
980 arg, version, real_name);
981 } else {
982 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
983 arg, version);
984 }
985 }
986 return real_name;
987 }
988 }
989 ShouldNotReachHere();
990 return NULL;
991 }
992
993 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
994 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
995 // Set tagset string buffer at max size of 256, large enough for any alias tagset
996 const int max_tagset_size = 256;
997 int max_tagset_len = max_tagset_size - 1;
998 char tagset_buffer[max_tagset_size];
999 tagset_buffer[0] = '\0';
1000
1001 // Write tag-set for aliased logging option, in string list form
1002 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1003 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1004 if (i > 0) {
1005 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1006 }
1007 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1008 }
1009 if (!alf.exactMatch) {
1010 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1011 }
1012 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1013 (on) ? "+" : "-",
1014 name,
1015 tagset_buffer,
1016 (on) ? LogLevel::name(alf.level) : "off");
1017 }
1018
1019 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1020 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1021 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1022 if (strcmp(alf.alias_name, name) == 0) {
1023 log_deprecated_flag(name, on, alf);
1024 return alf;
1025 }
1026 }
1027 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1028 return a;
1029 }
1030
1031 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1032
1033 // range of acceptable characters spelled out for portability reasons
1034 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1035 #define BUFLEN 255
1036 char name[BUFLEN+1];
1037 char dummy;
1038 const char* real_name;
1039 bool warn_if_deprecated = true;
1040
1041 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1042 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1043 if (alf.alias_name != NULL){
1044 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1045 return true;
1046 }
1047 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1048 if (real_name == NULL) {
1049 return false;
1050 }
1051 return set_bool_flag(real_name, false, origin);
1052 }
1053 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1054 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1055 if (alf.alias_name != NULL){
1056 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1057 return true;
1058 }
1059 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1060 if (real_name == NULL) {
1061 return false;
1062 }
1063 return set_bool_flag(real_name, true, origin);
1064 }
1065
1066 char punct;
1067 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1068 const char* value = strchr(arg, '=') + 1;
1069 JVMFlag* flag;
1070
1071 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1072 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1073 if (alf.alias_name != NULL) {
1074 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1075 return true;
1076 }
1077 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1078 if (real_name == NULL) {
1079 return false;
1080 }
1081 flag = JVMFlag::find_flag(real_name);
1082 if (flag != NULL && flag->is_ccstr()) {
1083 if (flag->ccstr_accumulates()) {
1084 return append_to_string_flag(real_name, value, origin);
1085 } else {
1086 if (value[0] == '\0') {
1087 value = NULL;
1088 }
1089 return set_string_flag(real_name, value, origin);
1090 }
1091 } else {
1092 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1093 }
1094 }
1095
1096 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1097 const char* value = strchr(arg, '=') + 1;
1098 // -XX:Foo:=xxx will reset the string flag to the given value.
1099 if (value[0] == '\0') {
1100 value = NULL;
1101 }
1102 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1103 if (real_name == NULL) {
1104 return false;
1105 }
1106 return set_string_flag(real_name, value, origin);
1107 }
1108
1109 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1110 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1111 #define NUMBER_RANGE "[0123456789eE+-]"
1112 char value[BUFLEN + 1];
1113 char value2[BUFLEN + 1];
1114 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1115 // Looks like a floating-point number -- try again with more lenient format string
1116 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1117 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1118 if (real_name == NULL) {
1119 return false;
1120 }
1121 return set_fp_numeric_flag(real_name, value, origin);
1122 }
1123 }
1124
1125 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1126 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1127 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1128 if (real_name == NULL) {
1129 return false;
1130 }
1131 return set_numeric_flag(real_name, value, origin);
1132 }
1133
1134 return false;
1135 }
1136
1137 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1138 assert(bldarray != NULL, "illegal argument");
1139
1140 if (arg == NULL) {
1141 return;
1142 }
1143
1144 int new_count = *count + 1;
1145
1146 // expand the array and add arg to the last element
1147 if (*bldarray == NULL) {
1148 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1149 } else {
1150 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1151 }
1152 (*bldarray)[*count] = os::strdup_check_oom(arg);
1153 *count = new_count;
1154 }
1155
1156 void Arguments::build_jvm_args(const char* arg) {
1157 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1158 }
1159
1160 void Arguments::build_jvm_flags(const char* arg) {
1161 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1162 }
1163
1164 // utility function to return a string that concatenates all
1165 // strings in a given char** array
1166 const char* Arguments::build_resource_string(char** args, int count) {
1167 if (args == NULL || count == 0) {
1168 return NULL;
1169 }
1170 size_t length = 0;
1171 for (int i = 0; i < count; i++) {
1172 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1173 }
1174 char* s = NEW_RESOURCE_ARRAY(char, length);
1175 char* dst = s;
1176 for (int j = 0; j < count; j++) {
1177 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1178 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1179 dst += offset;
1180 length -= offset;
1181 }
1182 return (const char*) s;
1183 }
1184
1185 void Arguments::print_on(outputStream* st) {
1186 st->print_cr("VM Arguments:");
1187 if (num_jvm_flags() > 0) {
1188 st->print("jvm_flags: "); print_jvm_flags_on(st);
1189 st->cr();
1190 }
1191 if (num_jvm_args() > 0) {
1192 st->print("jvm_args: "); print_jvm_args_on(st);
1193 st->cr();
1194 }
1195 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1196 if (_java_class_path != NULL) {
1197 char* path = _java_class_path->value();
1198 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1199 }
1200 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1201 }
1202
1203 void Arguments::print_summary_on(outputStream* st) {
1204 // Print the command line. Environment variables that are helpful for
1205 // reproducing the problem are written later in the hs_err file.
1206 // flags are from setting file
1207 if (num_jvm_flags() > 0) {
1208 st->print_raw("Settings File: ");
1209 print_jvm_flags_on(st);
1210 st->cr();
1211 }
1212 // args are the command line and environment variable arguments.
1213 st->print_raw("Command Line: ");
1214 if (num_jvm_args() > 0) {
1215 print_jvm_args_on(st);
1216 }
1217 // this is the classfile and any arguments to the java program
1218 if (java_command() != NULL) {
1219 st->print("%s", java_command());
1220 }
1221 st->cr();
1222 }
1223
1224 void Arguments::print_jvm_flags_on(outputStream* st) {
1225 if (_num_jvm_flags > 0) {
1226 for (int i=0; i < _num_jvm_flags; i++) {
1227 st->print("%s ", _jvm_flags_array[i]);
1228 }
1229 }
1230 }
1231
1232 void Arguments::print_jvm_args_on(outputStream* st) {
1233 if (_num_jvm_args > 0) {
1234 for (int i=0; i < _num_jvm_args; i++) {
1235 st->print("%s ", _jvm_args_array[i]);
1236 }
1237 }
1238 }
1239
1240 bool Arguments::process_argument(const char* arg,
1241 jboolean ignore_unrecognized,
1242 JVMFlag::Flags origin) {
1243 JDK_Version since = JDK_Version();
1244
1245 if (parse_argument(arg, origin)) {
1246 return true;
1247 }
1248
1249 // Determine if the flag has '+', '-', or '=' characters.
1250 bool has_plus_minus = (*arg == '+' || *arg == '-');
1251 const char* const argname = has_plus_minus ? arg + 1 : arg;
1252
1253 size_t arg_len;
1254 const char* equal_sign = strchr(argname, '=');
1255 if (equal_sign == NULL) {
1256 arg_len = strlen(argname);
1257 } else {
1258 arg_len = equal_sign - argname;
1259 }
1260
1261 // Only make the obsolete check for valid arguments.
1262 if (arg_len <= BUFLEN) {
1263 // Construct a string which consists only of the argument name without '+', '-', or '='.
1264 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1265 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1266 if (is_obsolete_flag(stripped_argname, &since)) {
1267 char version[256];
1268 since.to_string(version, sizeof(version));
1269 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1270 return true;
1271 }
1272 #ifndef PRODUCT
1273 else {
1274 const char* replacement;
1275 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1276 log_warning(arguments)("%s has been removed. Please use %s instead.",
1277 stripped_argname,
1278 replacement);
1279 return false;
1280 }
1281 }
1282 #endif //PRODUCT
1283 }
1284
1285 // For locked flags, report a custom error message if available.
1286 // Otherwise, report the standard unrecognized VM option.
1287 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1288 if (found_flag != NULL) {
1289 char locked_message_buf[BUFLEN];
1290 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1291 if (strlen(locked_message_buf) == 0) {
1292 if (found_flag->is_bool() && !has_plus_minus) {
1293 jio_fprintf(defaultStream::error_stream(),
1294 "Missing +/- setting for VM option '%s'\n", argname);
1295 } else if (!found_flag->is_bool() && has_plus_minus) {
1296 jio_fprintf(defaultStream::error_stream(),
1297 "Unexpected +/- setting in VM option '%s'\n", argname);
1298 } else {
1299 jio_fprintf(defaultStream::error_stream(),
1300 "Improperly specified VM option '%s'\n", argname);
1301 }
1302 } else {
1303 #ifdef PRODUCT
1304 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1305 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1306 if (ignore_unrecognized && mismatched) {
1307 return true;
1308 }
1309 #endif
1310 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1311 }
1312 } else {
1313 if (ignore_unrecognized) {
1314 return true;
1315 }
1316 jio_fprintf(defaultStream::error_stream(),
1317 "Unrecognized VM option '%s'\n", argname);
1318 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1319 if (fuzzy_matched != NULL) {
1320 jio_fprintf(defaultStream::error_stream(),
1321 "Did you mean '%s%s%s'? ",
1322 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1323 fuzzy_matched->_name,
1324 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1325 }
1326 }
1327
1328 // allow for commandline "commenting out" options like -XX:#+Verbose
1329 return arg[0] == '#';
1330 }
1331
1332 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1333 FILE* stream = fopen(file_name, "rb");
1334 if (stream == NULL) {
1335 if (should_exist) {
1336 jio_fprintf(defaultStream::error_stream(),
1337 "Could not open settings file %s\n", file_name);
1338 return false;
1339 } else {
1340 return true;
1341 }
1342 }
1343
1344 char token[1024];
1345 int pos = 0;
1346
1347 bool in_white_space = true;
1348 bool in_comment = false;
1349 bool in_quote = false;
1350 char quote_c = 0;
1351 bool result = true;
1352
1353 int c = getc(stream);
1354 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1355 if (in_white_space) {
1356 if (in_comment) {
1357 if (c == '\n') in_comment = false;
1358 } else {
1359 if (c == '#') in_comment = true;
1360 else if (!isspace(c)) {
1361 in_white_space = false;
1362 token[pos++] = c;
1363 }
1364 }
1365 } else {
1366 if (c == '\n' || (!in_quote && isspace(c))) {
1367 // token ends at newline, or at unquoted whitespace
1368 // this allows a way to include spaces in string-valued options
1369 token[pos] = '\0';
1370 logOption(token);
1371 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1372 build_jvm_flags(token);
1373 pos = 0;
1374 in_white_space = true;
1375 in_quote = false;
1376 } else if (!in_quote && (c == '\'' || c == '"')) {
1377 in_quote = true;
1378 quote_c = c;
1379 } else if (in_quote && (c == quote_c)) {
1380 in_quote = false;
1381 } else {
1382 token[pos++] = c;
1383 }
1384 }
1385 c = getc(stream);
1386 }
1387 if (pos > 0) {
1388 token[pos] = '\0';
1389 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1390 build_jvm_flags(token);
1391 }
1392 fclose(stream);
1393 return result;
1394 }
1395
1396 //=============================================================================================================
1397 // Parsing of properties (-D)
1398
1399 const char* Arguments::get_property(const char* key) {
1400 return PropertyList_get_value(system_properties(), key);
1401 }
1402
1403 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1404 const char* eq = strchr(prop, '=');
1405 const char* key;
1406 const char* value = "";
1407
1408 if (eq == NULL) {
1409 // property doesn't have a value, thus use passed string
1410 key = prop;
1411 } else {
1412 // property have a value, thus extract it and save to the
1413 // allocated string
1414 size_t key_len = eq - prop;
1415 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1416
1417 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1418 key = tmp_key;
1419
1420 value = &prop[key_len + 1];
1421 }
1422
1423 if (strcmp(key, "java.compiler") == 0) {
1424 process_java_compiler_argument(value);
1425 // Record value in Arguments, but let it get passed to Java.
1426 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1427 strcmp(key, "sun.java.launcher.pid") == 0) {
1428 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1429 // private and are processed in process_sun_java_launcher_properties();
1430 // the sun.java.launcher property is passed on to the java application
1431 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1432 // append is true, writable is true, internal is false
1433 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1434 WriteableProperty, ExternalProperty);
1435 } else {
1436 if (strcmp(key, "sun.java.command") == 0) {
1437 char *old_java_command = _java_command;
1438 _java_command = os::strdup_check_oom(value, mtArguments);
1439 if (old_java_command != NULL) {
1440 os::free(old_java_command);
1441 }
1442 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1443 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1444 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1445 // its value without going through the property list or making a Java call.
1446 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1447 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1448 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1449 os::free((void *)old_java_vendor_url_bug);
1450 }
1451 }
1452
1453 // Create new property and add at the end of the list
1454 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1455 }
1456
1457 if (key != prop) {
1458 // SystemProperty copy passed value, thus free previously allocated
1459 // memory
1460 FreeHeap((void *)key);
1461 }
1462
1463 return true;
1464 }
1465
1466 #if INCLUDE_CDS
1467 const char* unsupported_properties[] = { "jdk.module.limitmods",
1468 "jdk.module.upgrade.path",
1469 "jdk.module.patch.0" };
1470 const char* unsupported_options[] = { "--limit-modules",
1471 "--upgrade-module-path",
1472 "--patch-module"
1473 };
1474 void Arguments::check_unsupported_dumping_properties() {
1475 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1476 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1477 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1478 SystemProperty* sp = system_properties();
1479 while (sp != NULL) {
1480 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1481 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1482 vm_exit_during_initialization(
1483 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1484 }
1485 }
1486 sp = sp->next();
1487 }
1488
1489 // Check for an exploded module build in use with -Xshare:dump.
1490 if (!has_jimage()) {
1491 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1492 }
1493 }
1494
1495 bool Arguments::check_unsupported_cds_runtime_properties() {
1496 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1497 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1498 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1499 if (get_property(unsupported_properties[i]) != NULL) {
1500 if (RequireSharedSpaces) {
1501 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1502 }
1503 return true;
1504 }
1505 }
1506 return false;
1507 }
1508 #endif
1509
1510 //===========================================================================================================
1511 // Setting int/mixed/comp mode flags
1512
1513 void Arguments::set_mode_flags(Mode mode) {
1514 // Set up default values for all flags.
1515 // If you add a flag to any of the branches below,
1516 // add a default value for it here.
1517 set_java_compiler(false);
1518 _mode = mode;
1519
1520 // Ensure Agent_OnLoad has the correct initial values.
1521 // This may not be the final mode; mode may change later in onload phase.
1522 PropertyList_unique_add(&_system_properties, "java.vm.info",
1523 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1524
1525 UseInterpreter = true;
1526 UseCompiler = true;
1527 UseLoopCounter = true;
1528
1529 // Default values may be platform/compiler dependent -
1530 // use the saved values
1531 ClipInlining = Arguments::_ClipInlining;
1532 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1533 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1534 BackgroundCompilation = Arguments::_BackgroundCompilation;
1535 if (TieredCompilation) {
1536 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1537 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1538 }
1539 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1540 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1541 }
1542 }
1543
1544 // Change from defaults based on mode
1545 switch (mode) {
1546 default:
1547 ShouldNotReachHere();
1548 break;
1549 case _int:
1550 UseCompiler = false;
1551 UseLoopCounter = false;
1552 AlwaysCompileLoopMethods = false;
1553 UseOnStackReplacement = false;
1554 break;
1555 case _mixed:
1556 // same as default
1557 break;
1558 case _comp:
1559 UseInterpreter = false;
1560 BackgroundCompilation = false;
1561 ClipInlining = false;
1562 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1563 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1564 // compile a level 4 (C2) and then continue executing it.
1565 if (TieredCompilation) {
1566 Tier3InvokeNotifyFreqLog = 0;
1567 Tier4InvocationThreshold = 0;
1568 }
1569 break;
1570 }
1571 }
1572
1573 // Conflict: required to use shared spaces (-Xshare:on), but
1574 // incompatible command line options were chosen.
1575 static void no_shared_spaces(const char* message) {
1576 if (RequireSharedSpaces) {
1577 jio_fprintf(defaultStream::error_stream(),
1578 "Class data sharing is inconsistent with other specified options.\n");
1579 vm_exit_during_initialization("Unable to use shared archive", message);
1580 } else {
1581 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1582 }
1583 }
1584
1585 void set_object_alignment() {
1586 // Object alignment.
1587 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1588 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1589 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1590 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1591 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1592 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1593
1594 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1595 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1596
1597 // Oop encoding heap max
1598 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1599
1600 if (SurvivorAlignmentInBytes == 0) {
1601 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1602 }
1603 }
1604
1605 size_t Arguments::max_heap_for_compressed_oops() {
1606 // Avoid sign flip.
1607 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1608 // We need to fit both the NULL page and the heap into the memory budget, while
1609 // keeping alignment constraints of the heap. To guarantee the latter, as the
1610 // NULL page is located before the heap, we pad the NULL page to the conservative
1611 // maximum alignment that the GC may ever impose upon the heap.
1612 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1613 _conservative_max_heap_alignment);
1614
1615 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1616 NOT_LP64(ShouldNotReachHere(); return 0);
1617 }
1618
1619 void Arguments::set_use_compressed_oops() {
1620 #ifndef ZERO
1621 #ifdef _LP64
1622 // MaxHeapSize is not set up properly at this point, but
1623 // the only value that can override MaxHeapSize if we are
1624 // to use UseCompressedOops is InitialHeapSize.
1625 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1626
1627 if (max_heap_size <= max_heap_for_compressed_oops()) {
1628 #if !defined(COMPILER1) || defined(TIERED)
1629 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1630 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1631 }
1632 #endif
1633 } else {
1634 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1635 warning("Max heap size too large for Compressed Oops");
1636 FLAG_SET_DEFAULT(UseCompressedOops, false);
1637 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1638 }
1639 }
1640 #endif // _LP64
1641 #endif // ZERO
1642 }
1643
1644
1645 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1646 // set_use_compressed_oops().
1647 void Arguments::set_use_compressed_klass_ptrs() {
1648 #ifndef ZERO
1649 #ifdef _LP64
1650 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1651 if (!UseCompressedOops) {
1652 if (UseCompressedClassPointers) {
1653 warning("UseCompressedClassPointers requires UseCompressedOops");
1654 }
1655 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1656 } else {
1657 // Turn on UseCompressedClassPointers too
1658 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1659 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1660 }
1661 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1662 if (UseCompressedClassPointers) {
1663 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1664 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1665 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1666 }
1667 }
1668 }
1669 #endif // _LP64
1670 #endif // !ZERO
1671 }
1672
1673 void Arguments::set_conservative_max_heap_alignment() {
1674 // The conservative maximum required alignment for the heap is the maximum of
1675 // the alignments imposed by several sources: any requirements from the heap
1676 // itself, the collector policy and the maximum page size we may run the VM
1677 // with.
1678 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1679 _conservative_max_heap_alignment = MAX4(heap_alignment,
1680 (size_t)os::vm_allocation_granularity(),
1681 os::max_page_size(),
1682 CollectorPolicy::compute_heap_alignment());
1683 }
1684
1685 jint Arguments::set_ergonomics_flags() {
1686 GCConfig::initialize();
1687
1688 set_conservative_max_heap_alignment();
1689
1690 #ifndef ZERO
1691 #ifdef _LP64
1692 set_use_compressed_oops();
1693
1694 // set_use_compressed_klass_ptrs() must be called after calling
1695 // set_use_compressed_oops().
1696 set_use_compressed_klass_ptrs();
1697
1698 // Also checks that certain machines are slower with compressed oops
1699 // in vm_version initialization code.
1700 #endif // _LP64
1701 #endif // !ZERO
1702
1703 return JNI_OK;
1704 }
1705
1706 julong Arguments::limit_by_allocatable_memory(julong limit) {
1707 julong max_allocatable;
1708 julong result = limit;
1709 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1710 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1711 }
1712 return result;
1713 }
1714
1715 // Use static initialization to get the default before parsing
1716 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1717
1718 void Arguments::set_heap_size() {
1719 julong phys_mem =
1720 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1721 : (julong)MaxRAM;
1722
1723 // Convert deprecated flags
1724 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1725 !FLAG_IS_DEFAULT(MaxRAMFraction))
1726 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1727
1728 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1729 !FLAG_IS_DEFAULT(MinRAMFraction))
1730 MinRAMPercentage = 100.0 / MinRAMFraction;
1731
1732 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1733 !FLAG_IS_DEFAULT(InitialRAMFraction))
1734 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1735
1736 // If the maximum heap size has not been set with -Xmx,
1737 // then set it as fraction of the size of physical memory,
1738 // respecting the maximum and minimum sizes of the heap.
1739 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1740 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1741 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1742 if (reasonable_min < MaxHeapSize) {
1743 // Small physical memory, so use a minimum fraction of it for the heap
1744 reasonable_max = reasonable_min;
1745 } else {
1746 // Not-small physical memory, so require a heap at least
1747 // as large as MaxHeapSize
1748 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1749 }
1750
1751 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1752 // Limit the heap size to ErgoHeapSizeLimit
1753 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1754 }
1755 if (UseCompressedOops) {
1756 // Limit the heap size to the maximum possible when using compressed oops
1757 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1758
1759 // HeapBaseMinAddress can be greater than default but not less than.
1760 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1761 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1762 // matches compressed oops printing flags
1763 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1764 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1765 DefaultHeapBaseMinAddress,
1766 DefaultHeapBaseMinAddress/G,
1767 HeapBaseMinAddress);
1768 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1769 }
1770 }
1771
1772 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1773 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1774 // but it should be not less than default MaxHeapSize.
1775 max_coop_heap -= HeapBaseMinAddress;
1776 }
1777 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1778 }
1779 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1780
1781 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1782 // An initial heap size was specified on the command line,
1783 // so be sure that the maximum size is consistent. Done
1784 // after call to limit_by_allocatable_memory because that
1785 // method might reduce the allocation size.
1786 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1787 }
1788
1789 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1790 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1791 }
1792
1793 // If the minimum or initial heap_size have not been set or requested to be set
1794 // ergonomically, set them accordingly.
1795 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1796 julong reasonable_minimum = (julong)(OldSize + NewSize);
1797
1798 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1799
1800 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1801
1802 if (InitialHeapSize == 0) {
1803 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1804
1805 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1806 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1807
1808 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1809
1810 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1811 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1812 }
1813 // If the minimum heap size has not been set (via -Xms),
1814 // synchronize with InitialHeapSize to avoid errors with the default value.
1815 if (min_heap_size() == 0) {
1816 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1817 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1818 }
1819 }
1820 }
1821
1822 // This option inspects the machine and attempts to set various
1823 // parameters to be optimal for long-running, memory allocation
1824 // intensive jobs. It is intended for machines with large
1825 // amounts of cpu and memory.
1826 jint Arguments::set_aggressive_heap_flags() {
1827 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1828 // VM, but we may not be able to represent the total physical memory
1829 // available (like having 8gb of memory on a box but using a 32bit VM).
1830 // Thus, we need to make sure we're using a julong for intermediate
1831 // calculations.
1832 julong initHeapSize;
1833 julong total_memory = os::physical_memory();
1834
1835 if (total_memory < (julong) 256 * M) {
1836 jio_fprintf(defaultStream::error_stream(),
1837 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1838 vm_exit(1);
1839 }
1840
1841 // The heap size is half of available memory, or (at most)
1842 // all of possible memory less 160mb (leaving room for the OS
1843 // when using ISM). This is the maximum; because adaptive sizing
1844 // is turned on below, the actual space used may be smaller.
1845
1846 initHeapSize = MIN2(total_memory / (julong) 2,
1847 total_memory - (julong) 160 * M);
1848
1849 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1850
1851 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1852 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1853 return JNI_EINVAL;
1854 }
1855 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1856 return JNI_EINVAL;
1857 }
1858 // Currently the minimum size and the initial heap sizes are the same.
1859 set_min_heap_size(initHeapSize);
1860 }
1861 if (FLAG_IS_DEFAULT(NewSize)) {
1862 // Make the young generation 3/8ths of the total heap.
1863 if (FLAG_SET_CMDLINE(size_t, NewSize,
1864 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1865 return JNI_EINVAL;
1866 }
1867 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1868 return JNI_EINVAL;
1869 }
1870 }
1871
1872 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1873 FLAG_SET_DEFAULT(UseLargePages, true);
1874 #endif
1875
1876 // Increase some data structure sizes for efficiency
1877 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1878 return JNI_EINVAL;
1879 }
1880 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) {
1881 return JNI_EINVAL;
1882 }
1883 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1884 return JNI_EINVAL;
1885 }
1886
1887 // See the OldPLABSize comment below, but replace 'after promotion'
1888 // with 'after copying'. YoungPLABSize is the size of the survivor
1889 // space per-gc-thread buffers. The default is 4kw.
1890 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1891 return JNI_EINVAL;
1892 }
1893
1894 // OldPLABSize is the size of the buffers in the old gen that
1895 // UseParallelGC uses to promote live data that doesn't fit in the
1896 // survivor spaces. At any given time, there's one for each gc thread.
1897 // The default size is 1kw. These buffers are rarely used, since the
1898 // survivor spaces are usually big enough. For specjbb, however, there
1899 // are occasions when there's lots of live data in the young gen
1900 // and we end up promoting some of it. We don't have a definite
1901 // explanation for why bumping OldPLABSize helps, but the theory
1902 // is that a bigger PLAB results in retaining something like the
1903 // original allocation order after promotion, which improves mutator
1904 // locality. A minor effect may be that larger PLABs reduce the
1905 // number of PLAB allocation events during gc. The value of 8kw
1906 // was arrived at by experimenting with specjbb.
1907 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1908 return JNI_EINVAL;
1909 }
1910
1911 // Enable parallel GC and adaptive generation sizing
1912 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) {
1913 return JNI_EINVAL;
1914 }
1915
1916 // Encourage steady state memory management
1917 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1918 return JNI_EINVAL;
1919 }
1920
1921 // This appears to improve mutator locality
1922 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1923 return JNI_EINVAL;
1924 }
1925
1926 // Get around early Solaris scheduling bug
1927 // (affinity vs other jobs on system)
1928 // but disallow DR and offlining (5008695).
1929 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1930 return JNI_EINVAL;
1931 }
1932
1933 return JNI_OK;
1934 }
1935
1936 // This must be called after ergonomics.
1937 void Arguments::set_bytecode_flags() {
1938 if (!RewriteBytecodes) {
1939 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1940 }
1941 }
1942
1943 // Aggressive optimization flags
1944 jint Arguments::set_aggressive_opts_flags() {
1945 #ifdef COMPILER2
1946 if (AggressiveUnboxing) {
1947 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1948 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1949 } else if (!EliminateAutoBox) {
1950 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1951 AggressiveUnboxing = false;
1952 }
1953 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1954 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1955 } else if (!DoEscapeAnalysis) {
1956 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1957 AggressiveUnboxing = false;
1958 }
1959 }
1960 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1961 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1962 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1963 }
1964 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1965 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1966 }
1967
1968 // Feed the cache size setting into the JDK
1969 char buffer[1024];
1970 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1971 if (!add_property(buffer)) {
1972 return JNI_ENOMEM;
1973 }
1974 }
1975 #endif
1976
1977 return JNI_OK;
1978 }
1979
1980 //===========================================================================================================
1981 // Parsing of java.compiler property
1982
1983 void Arguments::process_java_compiler_argument(const char* arg) {
1984 // For backwards compatibility, Djava.compiler=NONE or ""
1985 // causes us to switch to -Xint mode UNLESS -Xdebug
1986 // is also specified.
1987 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1988 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1989 }
1990 }
1991
1992 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1993 _sun_java_launcher = os::strdup_check_oom(launcher);
1994 }
1995
1996 bool Arguments::created_by_java_launcher() {
1997 assert(_sun_java_launcher != NULL, "property must have value");
1998 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1999 }
2000
2001 bool Arguments::sun_java_launcher_is_altjvm() {
2002 return _sun_java_launcher_is_altjvm;
2003 }
2004
2005 //===========================================================================================================
2006 // Parsing of main arguments
2007
2008 unsigned int addreads_count = 0;
2009 unsigned int addexports_count = 0;
2010 unsigned int addopens_count = 0;
2011 unsigned int addmods_count = 0;
2012 unsigned int patch_mod_count = 0;
2013
2014 // Check the consistency of vm_init_args
2015 bool Arguments::check_vm_args_consistency() {
2016 // Method for adding checks for flag consistency.
2017 // The intent is to warn the user of all possible conflicts,
2018 // before returning an error.
2019 // Note: Needs platform-dependent factoring.
2020 bool status = true;
2021
2022 if (TLABRefillWasteFraction == 0) {
2023 jio_fprintf(defaultStream::error_stream(),
2024 "TLABRefillWasteFraction should be a denominator, "
2025 "not " SIZE_FORMAT "\n",
2026 TLABRefillWasteFraction);
2027 status = false;
2028 }
2029
2030 if (PrintNMTStatistics) {
2031 #if INCLUDE_NMT
2032 if (MemTracker::tracking_level() == NMT_off) {
2033 #endif // INCLUDE_NMT
2034 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2035 PrintNMTStatistics = false;
2036 #if INCLUDE_NMT
2037 }
2038 #endif
2039 }
2040
2041 status = CompilerConfig::check_args_consistency(status);
2042 #if INCLUDE_JVMCI
2043 if (status && EnableJVMCI) {
2044 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2045 AddProperty, UnwriteableProperty, InternalProperty);
2046 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2047 return false;
2048 }
2049 }
2050 #endif
2051
2052 #ifndef SUPPORT_RESERVED_STACK_AREA
2053 if (StackReservedPages != 0) {
2054 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2055 warning("Reserved Stack Area not supported on this platform");
2056 }
2057 #endif
2058
2059 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2060 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2061 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2062 }
2063 }
2064 return status;
2065 }
2066
2067 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2068 const char* option_type) {
2069 if (ignore) return false;
2070
2071 const char* spacer = " ";
2072 if (option_type == NULL) {
2073 option_type = ++spacer; // Set both to the empty string.
2074 }
2075
2076 if (os::obsolete_option(option)) {
2077 jio_fprintf(defaultStream::error_stream(),
2078 "Obsolete %s%soption: %s\n", option_type, spacer,
2079 option->optionString);
2080 return false;
2081 } else {
2082 jio_fprintf(defaultStream::error_stream(),
2083 "Unrecognized %s%soption: %s\n", option_type, spacer,
2084 option->optionString);
2085 return true;
2086 }
2087 }
2088
2089 static const char* user_assertion_options[] = {
2090 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2091 };
2092
2093 static const char* system_assertion_options[] = {
2094 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2095 };
2096
2097 bool Arguments::parse_uintx(const char* value,
2098 uintx* uintx_arg,
2099 uintx min_size) {
2100
2101 // Check the sign first since atojulong() parses only unsigned values.
2102 bool value_is_positive = !(*value == '-');
2103
2104 if (value_is_positive) {
2105 julong n;
2106 bool good_return = atojulong(value, &n);
2107 if (good_return) {
2108 bool above_minimum = n >= min_size;
2109 bool value_is_too_large = n > max_uintx;
2110
2111 if (above_minimum && !value_is_too_large) {
2112 *uintx_arg = n;
2113 return true;
2114 }
2115 }
2116 }
2117 return false;
2118 }
2119
2120 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2121 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2122 char* property = AllocateHeap(prop_len, mtArguments);
2123 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2124 if (ret < 0 || ret >= (int)prop_len) {
2125 FreeHeap(property);
2126 return false;
2127 }
2128 bool added = add_property(property, UnwriteableProperty, internal);
2129 FreeHeap(property);
2130 return added;
2131 }
2132
2133 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2134 const unsigned int props_count_limit = 1000;
2135 const int max_digits = 3;
2136 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2137
2138 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2139 if (count < props_count_limit) {
2140 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2141 char* property = AllocateHeap(prop_len, mtArguments);
2142 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2143 if (ret < 0 || ret >= (int)prop_len) {
2144 FreeHeap(property);
2145 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2146 return false;
2147 }
2148 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2149 FreeHeap(property);
2150 return added;
2151 }
2152
2153 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2154 return false;
2155 }
2156
2157 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2158 julong* long_arg,
2159 julong min_size,
2160 julong max_size) {
2161 if (!atojulong(s, long_arg)) return arg_unreadable;
2162 return check_memory_size(*long_arg, min_size, max_size);
2163 }
2164
2165 // Parse JavaVMInitArgs structure
2166
2167 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2168 const JavaVMInitArgs *java_options_args,
2169 const JavaVMInitArgs *cmd_line_args) {
2170 bool patch_mod_javabase = false;
2171
2172 // Save default settings for some mode flags
2173 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2174 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2175 Arguments::_ClipInlining = ClipInlining;
2176 Arguments::_BackgroundCompilation = BackgroundCompilation;
2177 if (TieredCompilation) {
2178 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2179 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2180 }
2181
2182 // Setup flags for mixed which is the default
2183 set_mode_flags(_mixed);
2184
2185 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2186 // variable (if present).
2187 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2188 if (result != JNI_OK) {
2189 return result;
2190 }
2191
2192 // Parse args structure generated from the command line flags.
2193 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2194 if (result != JNI_OK) {
2195 return result;
2196 }
2197
2198 // Parse args structure generated from the _JAVA_OPTIONS environment
2199 // variable (if present) (mimics classic VM)
2200 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2201 if (result != JNI_OK) {
2202 return result;
2203 }
2204
2205 // We need to ensure processor and memory resources have been properly
2206 // configured - which may rely on arguments we just processed - before
2207 // doing the final argument processing. Any argument processing that
2208 // needs to know about processor and memory resources must occur after
2209 // this point.
2210
2211 os::init_container_support();
2212
2213 // Do final processing now that all arguments have been parsed
2214 result = finalize_vm_init_args(patch_mod_javabase);
2215 if (result != JNI_OK) {
2216 return result;
2217 }
2218
2219 return JNI_OK;
2220 }
2221
2222 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2223 // represents a valid JDWP agent. is_path==true denotes that we
2224 // are dealing with -agentpath (case where name is a path), otherwise with
2225 // -agentlib
2226 bool valid_jdwp_agent(char *name, bool is_path) {
2227 char *_name;
2228 const char *_jdwp = "jdwp";
2229 size_t _len_jdwp, _len_prefix;
2230
2231 if (is_path) {
2232 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2233 return false;
2234 }
2235
2236 _name++; // skip past last path separator
2237 _len_prefix = strlen(JNI_LIB_PREFIX);
2238
2239 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2240 return false;
2241 }
2242
2243 _name += _len_prefix;
2244 _len_jdwp = strlen(_jdwp);
2245
2246 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2247 _name += _len_jdwp;
2248 }
2249 else {
2250 return false;
2251 }
2252
2253 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2254 return false;
2255 }
2256
2257 return true;
2258 }
2259
2260 if (strcmp(name, _jdwp) == 0) {
2261 return true;
2262 }
2263
2264 return false;
2265 }
2266
2267 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2268 // --patch-module=<module>=<file>(<pathsep><file>)*
2269 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2270 // Find the equal sign between the module name and the path specification
2271 const char* module_equal = strchr(patch_mod_tail, '=');
2272 if (module_equal == NULL) {
2273 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2274 return JNI_ERR;
2275 } else {
2276 // Pick out the module name
2277 size_t module_len = module_equal - patch_mod_tail;
2278 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2279 if (module_name != NULL) {
2280 memcpy(module_name, patch_mod_tail, module_len);
2281 *(module_name + module_len) = '\0';
2282 // The path piece begins one past the module_equal sign
2283 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2284 FREE_C_HEAP_ARRAY(char, module_name);
2285 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2286 return JNI_ENOMEM;
2287 }
2288 } else {
2289 return JNI_ENOMEM;
2290 }
2291 }
2292 return JNI_OK;
2293 }
2294
2295 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2296 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2297 // The min and max sizes match the values in globals.hpp, but scaled
2298 // with K. The values have been chosen so that alignment with page
2299 // size doesn't change the max value, which makes the conversions
2300 // back and forth between Xss value and ThreadStackSize value easier.
2301 // The values have also been chosen to fit inside a 32-bit signed type.
2302 const julong min_ThreadStackSize = 0;
2303 const julong max_ThreadStackSize = 1 * M;
2304
2305 const julong min_size = min_ThreadStackSize * K;
2306 const julong max_size = max_ThreadStackSize * K;
2307
2308 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2309
2310 julong size = 0;
2311 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2312 if (errcode != arg_in_range) {
2313 bool silent = (option == NULL); // Allow testing to silence error messages
2314 if (!silent) {
2315 jio_fprintf(defaultStream::error_stream(),
2316 "Invalid thread stack size: %s\n", option->optionString);
2317 describe_range_error(errcode);
2318 }
2319 return JNI_EINVAL;
2320 }
2321
2322 // Internally track ThreadStackSize in units of 1024 bytes.
2323 const julong size_aligned = align_up(size, K);
2324 assert(size <= size_aligned,
2325 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2326 size, size_aligned);
2327
2328 const julong size_in_K = size_aligned / K;
2329 assert(size_in_K < (julong)max_intx,
2330 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2331 size_in_K);
2332
2333 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2334 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2335 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2336 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2337 max_expanded, size_in_K);
2338
2339 *out_ThreadStackSize = (intx)size_in_K;
2340
2341 return JNI_OK;
2342 }
2343
2344 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2345 // For match_option to return remaining or value part of option string
2346 const char* tail;
2347
2348 // iterate over arguments
2349 for (int index = 0; index < args->nOptions; index++) {
2350 bool is_absolute_path = false; // for -agentpath vs -agentlib
2351
2352 const JavaVMOption* option = args->options + index;
2353
2354 if (!match_option(option, "-Djava.class.path", &tail) &&
2355 !match_option(option, "-Dsun.java.command", &tail) &&
2356 !match_option(option, "-Dsun.java.launcher", &tail)) {
2357
2358 // add all jvm options to the jvm_args string. This string
2359 // is used later to set the java.vm.args PerfData string constant.
2360 // the -Djava.class.path and the -Dsun.java.command options are
2361 // omitted from jvm_args string as each have their own PerfData
2362 // string constant object.
2363 build_jvm_args(option->optionString);
2364 }
2365
2366 // -verbose:[class/module/gc/jni]
2367 if (match_option(option, "-verbose", &tail)) {
2368 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2369 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2370 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2371 } else if (!strcmp(tail, ":module")) {
2372 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2373 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2374 } else if (!strcmp(tail, ":gc")) {
2375 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2376 } else if (!strcmp(tail, ":jni")) {
2377 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2378 return JNI_EINVAL;
2379 }
2380 }
2381 // -da / -ea / -disableassertions / -enableassertions
2382 // These accept an optional class/package name separated by a colon, e.g.,
2383 // -da:java.lang.Thread.
2384 } else if (match_option(option, user_assertion_options, &tail, true)) {
2385 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2386 if (*tail == '\0') {
2387 JavaAssertions::setUserClassDefault(enable);
2388 } else {
2389 assert(*tail == ':', "bogus match by match_option()");
2390 JavaAssertions::addOption(tail + 1, enable);
2391 }
2392 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2393 } else if (match_option(option, system_assertion_options, &tail, false)) {
2394 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2395 JavaAssertions::setSystemClassDefault(enable);
2396 // -bootclasspath:
2397 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2398 jio_fprintf(defaultStream::output_stream(),
2399 "-Xbootclasspath is no longer a supported option.\n");
2400 return JNI_EINVAL;
2401 // -bootclasspath/a:
2402 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2403 Arguments::append_sysclasspath(tail);
2404 // -bootclasspath/p:
2405 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2406 jio_fprintf(defaultStream::output_stream(),
2407 "-Xbootclasspath/p is no longer a supported option.\n");
2408 return JNI_EINVAL;
2409 // -Xrun
2410 } else if (match_option(option, "-Xrun", &tail)) {
2411 if (tail != NULL) {
2412 const char* pos = strchr(tail, ':');
2413 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2414 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2415 jio_snprintf(name, len + 1, "%s", tail);
2416
2417 char *options = NULL;
2418 if(pos != NULL) {
2419 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2420 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2421 }
2422 #if !INCLUDE_JVMTI
2423 if (strcmp(name, "jdwp") == 0) {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "Debugging agents are not supported in this VM\n");
2426 return JNI_ERR;
2427 }
2428 #endif // !INCLUDE_JVMTI
2429 add_init_library(name, options);
2430 }
2431 } else if (match_option(option, "--add-reads=", &tail)) {
2432 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2433 return JNI_ENOMEM;
2434 }
2435 } else if (match_option(option, "--add-exports=", &tail)) {
2436 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2437 return JNI_ENOMEM;
2438 }
2439 } else if (match_option(option, "--add-opens=", &tail)) {
2440 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2441 return JNI_ENOMEM;
2442 }
2443 } else if (match_option(option, "--add-modules=", &tail)) {
2444 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2445 return JNI_ENOMEM;
2446 }
2447 } else if (match_option(option, "--limit-modules=", &tail)) {
2448 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2449 return JNI_ENOMEM;
2450 }
2451 } else if (match_option(option, "--module-path=", &tail)) {
2452 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2453 return JNI_ENOMEM;
2454 }
2455 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2456 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2457 return JNI_ENOMEM;
2458 }
2459 } else if (match_option(option, "--patch-module=", &tail)) {
2460 // --patch-module=<module>=<file>(<pathsep><file>)*
2461 int res = process_patch_mod_option(tail, patch_mod_javabase);
2462 if (res != JNI_OK) {
2463 return res;
2464 }
2465 } else if (match_option(option, "--illegal-access=", &tail)) {
2466 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2467 return JNI_ENOMEM;
2468 }
2469 // -agentlib and -agentpath
2470 } else if (match_option(option, "-agentlib:", &tail) ||
2471 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2472 if(tail != NULL) {
2473 const char* pos = strchr(tail, '=');
2474 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2475 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2476 name[len] = '\0';
2477
2478 char *options = NULL;
2479 if(pos != NULL) {
2480 options = os::strdup_check_oom(pos + 1, mtArguments);
2481 }
2482 #if !INCLUDE_JVMTI
2483 if (valid_jdwp_agent(name, is_absolute_path)) {
2484 jio_fprintf(defaultStream::error_stream(),
2485 "Debugging agents are not supported in this VM\n");
2486 return JNI_ERR;
2487 }
2488 #endif // !INCLUDE_JVMTI
2489 add_init_agent(name, options, is_absolute_path);
2490 }
2491 // -javaagent
2492 } else if (match_option(option, "-javaagent:", &tail)) {
2493 #if !INCLUDE_JVMTI
2494 jio_fprintf(defaultStream::error_stream(),
2495 "Instrumentation agents are not supported in this VM\n");
2496 return JNI_ERR;
2497 #else
2498 if (tail != NULL) {
2499 size_t length = strlen(tail) + 1;
2500 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2501 jio_snprintf(options, length, "%s", tail);
2502 add_instrument_agent("instrument", options, false);
2503 // java agents need module java.instrument
2504 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2505 return JNI_ENOMEM;
2506 }
2507 }
2508 #endif // !INCLUDE_JVMTI
2509 // --enable_preview
2510 } else if (match_option(option, "--enable-preview")) {
2511 set_enable_preview();
2512 // -Xnoclassgc
2513 } else if (match_option(option, "-Xnoclassgc")) {
2514 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) {
2515 return JNI_EINVAL;
2516 }
2517 // -Xconcgc
2518 } else if (match_option(option, "-Xconcgc")) {
2519 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2520 return JNI_EINVAL;
2521 }
2522 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2523 // -Xnoconcgc
2524 } else if (match_option(option, "-Xnoconcgc")) {
2525 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2526 return JNI_EINVAL;
2527 }
2528 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2529 // -Xbatch
2530 } else if (match_option(option, "-Xbatch")) {
2531 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2532 return JNI_EINVAL;
2533 }
2534 // -Xmn for compatibility with other JVM vendors
2535 } else if (match_option(option, "-Xmn", &tail)) {
2536 julong long_initial_young_size = 0;
2537 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2538 if (errcode != arg_in_range) {
2539 jio_fprintf(defaultStream::error_stream(),
2540 "Invalid initial young generation size: %s\n", option->optionString);
2541 describe_range_error(errcode);
2542 return JNI_EINVAL;
2543 }
2544 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2545 return JNI_EINVAL;
2546 }
2547 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2548 return JNI_EINVAL;
2549 }
2550 // -Xms
2551 } else if (match_option(option, "-Xms", &tail)) {
2552 julong long_initial_heap_size = 0;
2553 // an initial heap size of 0 means automatically determine
2554 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2555 if (errcode != arg_in_range) {
2556 jio_fprintf(defaultStream::error_stream(),
2557 "Invalid initial heap size: %s\n", option->optionString);
2558 describe_range_error(errcode);
2559 return JNI_EINVAL;
2560 }
2561 set_min_heap_size((size_t)long_initial_heap_size);
2562 // Currently the minimum size and the initial heap sizes are the same.
2563 // Can be overridden with -XX:InitialHeapSize.
2564 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2565 return JNI_EINVAL;
2566 }
2567 // -Xmx
2568 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2569 julong long_max_heap_size = 0;
2570 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2571 if (errcode != arg_in_range) {
2572 jio_fprintf(defaultStream::error_stream(),
2573 "Invalid maximum heap size: %s\n", option->optionString);
2574 describe_range_error(errcode);
2575 return JNI_EINVAL;
2576 }
2577 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2578 return JNI_EINVAL;
2579 }
2580 // Xmaxf
2581 } else if (match_option(option, "-Xmaxf", &tail)) {
2582 char* err;
2583 int maxf = (int)(strtod(tail, &err) * 100);
2584 if (*err != '\0' || *tail == '\0') {
2585 jio_fprintf(defaultStream::error_stream(),
2586 "Bad max heap free percentage size: %s\n",
2587 option->optionString);
2588 return JNI_EINVAL;
2589 } else {
2590 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2591 return JNI_EINVAL;
2592 }
2593 }
2594 // Xminf
2595 } else if (match_option(option, "-Xminf", &tail)) {
2596 char* err;
2597 int minf = (int)(strtod(tail, &err) * 100);
2598 if (*err != '\0' || *tail == '\0') {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Bad min heap free percentage size: %s\n",
2601 option->optionString);
2602 return JNI_EINVAL;
2603 } else {
2604 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2605 return JNI_EINVAL;
2606 }
2607 }
2608 // -Xss
2609 } else if (match_option(option, "-Xss", &tail)) {
2610 intx value = 0;
2611 jint err = parse_xss(option, tail, &value);
2612 if (err != JNI_OK) {
2613 return err;
2614 }
2615 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) {
2616 return JNI_EINVAL;
2617 }
2618 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2619 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2620 julong long_ReservedCodeCacheSize = 0;
2621
2622 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2623 if (errcode != arg_in_range) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Invalid maximum code cache size: %s.\n", option->optionString);
2626 return JNI_EINVAL;
2627 }
2628 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2629 return JNI_EINVAL;
2630 }
2631 // -green
2632 } else if (match_option(option, "-green")) {
2633 jio_fprintf(defaultStream::error_stream(),
2634 "Green threads support not available\n");
2635 return JNI_EINVAL;
2636 // -native
2637 } else if (match_option(option, "-native")) {
2638 // HotSpot always uses native threads, ignore silently for compatibility
2639 // -Xrs
2640 } else if (match_option(option, "-Xrs")) {
2641 // Classic/EVM option, new functionality
2642 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2643 return JNI_EINVAL;
2644 }
2645 // -Xprof
2646 } else if (match_option(option, "-Xprof")) {
2647 char version[256];
2648 // Obsolete in JDK 10
2649 JDK_Version::jdk(10).to_string(version, sizeof(version));
2650 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2651 // -Xconcurrentio
2652 } else if (match_option(option, "-Xconcurrentio")) {
2653 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != JVMFlag::SUCCESS) {
2654 return JNI_EINVAL;
2655 }
2656 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2657 return JNI_EINVAL;
2658 }
2659 SafepointSynchronize::set_defer_thr_suspend_loop_count();
2660 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != JVMFlag::SUCCESS) {
2661 return JNI_EINVAL;
2662 }
2663 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != JVMFlag::SUCCESS) { // 20Kb per thread added to new generation
2664 return JNI_EINVAL;
2665 }
2666
2667 // -Xinternalversion
2668 } else if (match_option(option, "-Xinternalversion")) {
2669 jio_fprintf(defaultStream::output_stream(), "%s\n",
2670 VM_Version::internal_vm_info_string());
2671 vm_exit(0);
2672 #ifndef PRODUCT
2673 // -Xprintflags
2674 } else if (match_option(option, "-Xprintflags")) {
2675 JVMFlag::printFlags(tty, false);
2676 vm_exit(0);
2677 #endif
2678 // -D
2679 } else if (match_option(option, "-D", &tail)) {
2680 const char* value;
2681 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2682 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2683 // abort if -Djava.endorsed.dirs is set
2684 jio_fprintf(defaultStream::output_stream(),
2685 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2686 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2687 return JNI_EINVAL;
2688 }
2689 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2690 *value != '\0' && strcmp(value, "\"\"") != 0) {
2691 // abort if -Djava.ext.dirs is set
2692 jio_fprintf(defaultStream::output_stream(),
2693 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2694 return JNI_EINVAL;
2695 }
2696 // Check for module related properties. They must be set using the modules
2697 // options. For example: use "--add-modules=java.sql", not
2698 // "-Djdk.module.addmods=java.sql"
2699 if (is_internal_module_property(option->optionString + 2)) {
2700 needs_module_property_warning = true;
2701 continue;
2702 }
2703
2704 if (!add_property(tail)) {
2705 return JNI_ENOMEM;
2706 }
2707 // Out of the box management support
2708 if (match_option(option, "-Dcom.sun.management", &tail)) {
2709 #if INCLUDE_MANAGEMENT
2710 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) {
2711 return JNI_EINVAL;
2712 }
2713 // management agent in module jdk.management.agent
2714 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2715 return JNI_ENOMEM;
2716 }
2717 #else
2718 jio_fprintf(defaultStream::output_stream(),
2719 "-Dcom.sun.management is not supported in this VM.\n");
2720 return JNI_ERR;
2721 #endif
2722 }
2723 // -Xint
2724 } else if (match_option(option, "-Xint")) {
2725 set_mode_flags(_int);
2726 // -Xmixed
2727 } else if (match_option(option, "-Xmixed")) {
2728 set_mode_flags(_mixed);
2729 // -Xcomp
2730 } else if (match_option(option, "-Xcomp")) {
2731 // for testing the compiler; turn off all flags that inhibit compilation
2732 set_mode_flags(_comp);
2733 // -Xshare:dump
2734 } else if (match_option(option, "-Xshare:dump")) {
2735 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2736 return JNI_EINVAL;
2737 }
2738 set_mode_flags(_int); // Prevent compilation, which creates objects
2739 // -Xshare:on
2740 } else if (match_option(option, "-Xshare:on")) {
2741 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2745 return JNI_EINVAL;
2746 }
2747 // -Xshare:auto
2748 } else if (match_option(option, "-Xshare:auto")) {
2749 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 // -Xshare:off
2756 } else if (match_option(option, "-Xshare:off")) {
2757 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 // -Xverify
2764 } else if (match_option(option, "-Xverify", &tail)) {
2765 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2766 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2770 return JNI_EINVAL;
2771 }
2772 } else if (strcmp(tail, ":remote") == 0) {
2773 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2774 return JNI_EINVAL;
2775 }
2776 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 } else if (strcmp(tail, ":none") == 0) {
2780 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2787 return JNI_EINVAL;
2788 }
2789 // -Xdebug
2790 } else if (match_option(option, "-Xdebug")) {
2791 // note this flag has been used, then ignore
2792 set_xdebug_mode(true);
2793 // -Xnoagent
2794 } else if (match_option(option, "-Xnoagent")) {
2795 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2796 } else if (match_option(option, "-Xloggc:", &tail)) {
2797 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2798 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2799 _gc_log_filename = os::strdup_check_oom(tail);
2800 } else if (match_option(option, "-Xlog", &tail)) {
2801 bool ret = false;
2802 if (strcmp(tail, ":help") == 0) {
2803 fileStream stream(defaultStream::output_stream());
2804 LogConfiguration::print_command_line_help(&stream);
2805 vm_exit(0);
2806 } else if (strcmp(tail, ":disable") == 0) {
2807 LogConfiguration::disable_logging();
2808 ret = true;
2809 } else if (*tail == '\0') {
2810 ret = LogConfiguration::parse_command_line_arguments();
2811 assert(ret, "-Xlog without arguments should never fail to parse");
2812 } else if (*tail == ':') {
2813 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2814 }
2815 if (ret == false) {
2816 jio_fprintf(defaultStream::error_stream(),
2817 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2818 tail);
2819 return JNI_EINVAL;
2820 }
2821 // JNI hooks
2822 } else if (match_option(option, "-Xcheck", &tail)) {
2823 if (!strcmp(tail, ":jni")) {
2824 #if !INCLUDE_JNI_CHECK
2825 warning("JNI CHECKING is not supported in this VM");
2826 #else
2827 CheckJNICalls = true;
2828 #endif // INCLUDE_JNI_CHECK
2829 } else if (is_bad_option(option, args->ignoreUnrecognized,
2830 "check")) {
2831 return JNI_EINVAL;
2832 }
2833 } else if (match_option(option, "vfprintf")) {
2834 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2835 } else if (match_option(option, "exit")) {
2836 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2837 } else if (match_option(option, "abort")) {
2838 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2839 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2840 // and the last option wins.
2841 } else if (match_option(option, "-XX:+NeverTenure")) {
2842 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) {
2843 return JNI_EINVAL;
2844 }
2845 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2846 return JNI_EINVAL;
2847 }
2848 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2849 return JNI_EINVAL;
2850 }
2851 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2852 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2853 return JNI_EINVAL;
2854 }
2855 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2856 return JNI_EINVAL;
2857 }
2858 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2862 uintx max_tenuring_thresh = 0;
2863 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2864 jio_fprintf(defaultStream::error_stream(),
2865 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2866 return JNI_EINVAL;
2867 }
2868
2869 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2870 return JNI_EINVAL;
2871 }
2872
2873 if (MaxTenuringThreshold == 0) {
2874 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2875 return JNI_EINVAL;
2876 }
2877 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 } else {
2881 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 }
2888 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2889 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2890 return JNI_EINVAL;
2891 }
2892 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2896 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2897 return JNI_EINVAL;
2898 }
2899 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2903 #if defined(DTRACE_ENABLED)
2904 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 #else // defined(DTRACE_ENABLED)
2917 jio_fprintf(defaultStream::error_stream(),
2918 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2919 return JNI_EINVAL;
2920 #endif // defined(DTRACE_ENABLED)
2921 #ifdef ASSERT
2922 } else if (match_option(option, "-XX:+FullGCALot")) {
2923 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 // disable scavenge before parallel mark-compact
2927 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2928 return JNI_EINVAL;
2929 }
2930 #endif
2931 #if !INCLUDE_MANAGEMENT
2932 } else if (match_option(option, "-XX:+ManagementServer")) {
2933 jio_fprintf(defaultStream::error_stream(),
2934 "ManagementServer is not supported in this VM.\n");
2935 return JNI_ERR;
2936 #endif // INCLUDE_MANAGEMENT
2937 #if INCLUDE_JFR
2938 } else if (match_jfr_option(&option)) {
2939 return JNI_EINVAL;
2940 #endif
2941 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2942 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2943 // already been handled
2944 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2945 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2946 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2947 return JNI_EINVAL;
2948 }
2949 }
2950 // Unknown option
2951 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2952 return JNI_ERR;
2953 }
2954 }
2955
2956 // PrintSharedArchiveAndExit will turn on
2957 // -Xshare:on
2958 // -Xlog:class+path=info
2959 if (PrintSharedArchiveAndExit) {
2960 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2964 return JNI_EINVAL;
2965 }
2966 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2967 }
2968
2969 // Change the default value for flags which have different default values
2970 // when working with older JDKs.
2971 #ifdef LINUX
2972 if (JDK_Version::current().compare_major(6) <= 0 &&
2973 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2974 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2975 }
2976 #endif // LINUX
2977 fix_appclasspath();
2978 return JNI_OK;
2979 }
2980
2981 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2982 // For java.base check for duplicate --patch-module options being specified on the command line.
2983 // This check is only required for java.base, all other duplicate module specifications
2984 // will be checked during module system initialization. The module system initialization
2985 // will throw an ExceptionInInitializerError if this situation occurs.
2986 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2987 if (*patch_mod_javabase) {
2988 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2989 } else {
2990 *patch_mod_javabase = true;
2991 }
2992 }
2993
2994 // Create GrowableArray lazily, only if --patch-module has been specified
2995 if (_patch_mod_prefix == NULL) {
2996 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
2997 }
2998
2999 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3000 }
3001
3002 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3003 //
3004 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3005 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3006 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3007 // path is treated as the current directory.
3008 //
3009 // This causes problems with CDS, which requires that all directories specified in the classpath
3010 // must be empty. In most cases, applications do NOT want to load classes from the current
3011 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3012 // scripts compatible with CDS.
3013 void Arguments::fix_appclasspath() {
3014 if (IgnoreEmptyClassPaths) {
3015 const char separator = *os::path_separator();
3016 const char* src = _java_class_path->value();
3017
3018 // skip over all the leading empty paths
3019 while (*src == separator) {
3020 src ++;
3021 }
3022
3023 char* copy = os::strdup_check_oom(src, mtArguments);
3024
3025 // trim all trailing empty paths
3026 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3027 *tail = '\0';
3028 }
3029
3030 char from[3] = {separator, separator, '\0'};
3031 char to [2] = {separator, '\0'};
3032 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3033 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3034 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3035 }
3036
3037 _java_class_path->set_writeable_value(copy);
3038 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3039 }
3040 }
3041
3042 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3043 // check if the default lib/endorsed directory exists; if so, error
3044 char path[JVM_MAXPATHLEN];
3045 const char* fileSep = os::file_separator();
3046 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3047
3048 DIR* dir = os::opendir(path);
3049 if (dir != NULL) {
3050 jio_fprintf(defaultStream::output_stream(),
3051 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3052 "in modular form will be supported via the concept of upgradeable modules.\n");
3053 os::closedir(dir);
3054 return JNI_ERR;
3055 }
3056
3057 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3058 dir = os::opendir(path);
3059 if (dir != NULL) {
3060 jio_fprintf(defaultStream::output_stream(),
3061 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3062 "Use -classpath instead.\n.");
3063 os::closedir(dir);
3064 return JNI_ERR;
3065 }
3066
3067 // This must be done after all arguments have been processed
3068 // and the container support has been initialized since AggressiveHeap
3069 // relies on the amount of total memory available.
3070 if (AggressiveHeap) {
3071 jint result = set_aggressive_heap_flags();
3072 if (result != JNI_OK) {
3073 return result;
3074 }
3075 }
3076
3077 // This must be done after all arguments have been processed.
3078 // java_compiler() true means set to "NONE" or empty.
3079 if (java_compiler() && !xdebug_mode()) {
3080 // For backwards compatibility, we switch to interpreted mode if
3081 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3082 // not specified.
3083 set_mode_flags(_int);
3084 }
3085
3086 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3087 // but like -Xint, leave compilation thresholds unaffected.
3088 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3089 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3090 set_mode_flags(_int);
3091 }
3092
3093 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3094 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3095 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3096 }
3097
3098 #if !COMPILER2_OR_JVMCI
3099 // Don't degrade server performance for footprint
3100 if (FLAG_IS_DEFAULT(UseLargePages) &&
3101 MaxHeapSize < LargePageHeapSizeThreshold) {
3102 // No need for large granularity pages w/small heaps.
3103 // Note that large pages are enabled/disabled for both the
3104 // Java heap and the code cache.
3105 FLAG_SET_DEFAULT(UseLargePages, false);
3106 }
3107
3108 UNSUPPORTED_OPTION(ProfileInterpreter);
3109 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3110 #endif
3111
3112 #ifndef TIERED
3113 // Tiered compilation is undefined.
3114 UNSUPPORTED_OPTION(TieredCompilation);
3115 #endif
3116
3117 if (!check_vm_args_consistency()) {
3118 return JNI_ERR;
3119 }
3120
3121 #if INCLUDE_CDS
3122 if (DumpSharedSpaces) {
3123 // Disable biased locking now as it interferes with the clean up of
3124 // the archived Klasses and Java string objects (at dump time only).
3125 UseBiasedLocking = false;
3126
3127 // Always verify non-system classes during CDS dump
3128 if (!BytecodeVerificationRemote) {
3129 BytecodeVerificationRemote = true;
3130 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3131 }
3132 }
3133 if (UseSharedSpaces && patch_mod_javabase) {
3134 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3135 }
3136 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3137 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3138 }
3139 #endif
3140
3141 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3142 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3143 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3144
3145 return JNI_OK;
3146 }
3147
3148 // Helper class for controlling the lifetime of JavaVMInitArgs
3149 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3150 // deleted on the destruction of the ScopedVMInitArgs object.
3151 class ScopedVMInitArgs : public StackObj {
3152 private:
3153 JavaVMInitArgs _args;
3154 char* _container_name;
3155 bool _is_set;
3156 char* _vm_options_file_arg;
3157
3158 public:
3159 ScopedVMInitArgs(const char *container_name) {
3160 _args.version = JNI_VERSION_1_2;
3161 _args.nOptions = 0;
3162 _args.options = NULL;
3163 _args.ignoreUnrecognized = false;
3164 _container_name = (char *)container_name;
3165 _is_set = false;
3166 _vm_options_file_arg = NULL;
3167 }
3168
3169 // Populates the JavaVMInitArgs object represented by this
3170 // ScopedVMInitArgs object with the arguments in options. The
3171 // allocated memory is deleted by the destructor. If this method
3172 // returns anything other than JNI_OK, then this object is in a
3173 // partially constructed state, and should be abandoned.
3174 jint set_args(GrowableArray<JavaVMOption>* options) {
3175 _is_set = true;
3176 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3177 JavaVMOption, options->length(), mtArguments);
3178 if (options_arr == NULL) {
3179 return JNI_ENOMEM;
3180 }
3181 _args.options = options_arr;
3182
3183 for (int i = 0; i < options->length(); i++) {
3184 options_arr[i] = options->at(i);
3185 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3186 if (options_arr[i].optionString == NULL) {
3187 // Rely on the destructor to do cleanup.
3188 _args.nOptions = i;
3189 return JNI_ENOMEM;
3190 }
3191 }
3192
3193 _args.nOptions = options->length();
3194 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3195 return JNI_OK;
3196 }
3197
3198 JavaVMInitArgs* get() { return &_args; }
3199 char* container_name() { return _container_name; }
3200 bool is_set() { return _is_set; }
3201 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3202 char* vm_options_file_arg() { return _vm_options_file_arg; }
3203
3204 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3205 if (_vm_options_file_arg != NULL) {
3206 os::free(_vm_options_file_arg);
3207 }
3208 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3209 }
3210
3211 ~ScopedVMInitArgs() {
3212 if (_vm_options_file_arg != NULL) {
3213 os::free(_vm_options_file_arg);
3214 }
3215 if (_args.options == NULL) return;
3216 for (int i = 0; i < _args.nOptions; i++) {
3217 os::free(_args.options[i].optionString);
3218 }
3219 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3220 }
3221
3222 // Insert options into this option list, to replace option at
3223 // vm_options_file_pos (-XX:VMOptionsFile)
3224 jint insert(const JavaVMInitArgs* args,
3225 const JavaVMInitArgs* args_to_insert,
3226 const int vm_options_file_pos) {
3227 assert(_args.options == NULL, "shouldn't be set yet");
3228 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3229 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3230
3231 int length = args->nOptions + args_to_insert->nOptions - 1;
3232 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3233 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3234 for (int i = 0; i < args->nOptions; i++) {
3235 if (i == vm_options_file_pos) {
3236 // insert the new options starting at the same place as the
3237 // -XX:VMOptionsFile option
3238 for (int j = 0; j < args_to_insert->nOptions; j++) {
3239 options->push(args_to_insert->options[j]);
3240 }
3241 } else {
3242 options->push(args->options[i]);
3243 }
3244 }
3245 // make into options array
3246 jint result = set_args(options);
3247 delete options;
3248 return result;
3249 }
3250 };
3251
3252 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3253 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3254 }
3255
3256 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3257 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3258 }
3259
3260 jint Arguments::parse_options_environment_variable(const char* name,
3261 ScopedVMInitArgs* vm_args) {
3262 char *buffer = ::getenv(name);
3263
3264 // Don't check this environment variable if user has special privileges
3265 // (e.g. unix su command).
3266 if (buffer == NULL || os::have_special_privileges()) {
3267 return JNI_OK;
3268 }
3269
3270 if ((buffer = os::strdup(buffer)) == NULL) {
3271 return JNI_ENOMEM;
3272 }
3273
3274 jio_fprintf(defaultStream::error_stream(),
3275 "Picked up %s: %s\n", name, buffer);
3276
3277 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3278
3279 os::free(buffer);
3280 return retcode;
3281 }
3282
3283 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3284 // read file into buffer
3285 int fd = ::open(file_name, O_RDONLY);
3286 if (fd < 0) {
3287 jio_fprintf(defaultStream::error_stream(),
3288 "Could not open options file '%s'\n",
3289 file_name);
3290 return JNI_ERR;
3291 }
3292
3293 struct stat stbuf;
3294 int retcode = os::stat(file_name, &stbuf);
3295 if (retcode != 0) {
3296 jio_fprintf(defaultStream::error_stream(),
3297 "Could not stat options file '%s'\n",
3298 file_name);
3299 os::close(fd);
3300 return JNI_ERR;
3301 }
3302
3303 if (stbuf.st_size == 0) {
3304 // tell caller there is no option data and that is ok
3305 os::close(fd);
3306 return JNI_OK;
3307 }
3308
3309 // '+ 1' for NULL termination even with max bytes
3310 size_t bytes_alloc = stbuf.st_size + 1;
3311
3312 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3313 if (NULL == buf) {
3314 jio_fprintf(defaultStream::error_stream(),
3315 "Could not allocate read buffer for options file parse\n");
3316 os::close(fd);
3317 return JNI_ENOMEM;
3318 }
3319
3320 memset(buf, 0, bytes_alloc);
3321
3322 // Fill buffer
3323 // Use ::read() instead of os::read because os::read()
3324 // might do a thread state transition
3325 // and it is too early for that here
3326
3327 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3328 os::close(fd);
3329 if (bytes_read < 0) {
3330 FREE_C_HEAP_ARRAY(char, buf);
3331 jio_fprintf(defaultStream::error_stream(),
3332 "Could not read options file '%s'\n", file_name);
3333 return JNI_ERR;
3334 }
3335
3336 if (bytes_read == 0) {
3337 // tell caller there is no option data and that is ok
3338 FREE_C_HEAP_ARRAY(char, buf);
3339 return JNI_OK;
3340 }
3341
3342 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3343
3344 FREE_C_HEAP_ARRAY(char, buf);
3345 return retcode;
3346 }
3347
3348 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3349 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3350
3351 // some pointers to help with parsing
3352 char *buffer_end = buffer + buf_len;
3353 char *opt_hd = buffer;
3354 char *wrt = buffer;
3355 char *rd = buffer;
3356
3357 // parse all options
3358 while (rd < buffer_end) {
3359 // skip leading white space from the input string
3360 while (rd < buffer_end && isspace(*rd)) {
3361 rd++;
3362 }
3363
3364 if (rd >= buffer_end) {
3365 break;
3366 }
3367
3368 // Remember this is where we found the head of the token.
3369 opt_hd = wrt;
3370
3371 // Tokens are strings of non white space characters separated
3372 // by one or more white spaces.
3373 while (rd < buffer_end && !isspace(*rd)) {
3374 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3375 int quote = *rd; // matching quote to look for
3376 rd++; // don't copy open quote
3377 while (rd < buffer_end && *rd != quote) {
3378 // include everything (even spaces)
3379 // up until the close quote
3380 *wrt++ = *rd++; // copy to option string
3381 }
3382
3383 if (rd < buffer_end) {
3384 rd++; // don't copy close quote
3385 } else {
3386 // did not see closing quote
3387 jio_fprintf(defaultStream::error_stream(),
3388 "Unmatched quote in %s\n", name);
3389 delete options;
3390 return JNI_ERR;
3391 }
3392 } else {
3393 *wrt++ = *rd++; // copy to option string
3394 }
3395 }
3396
3397 // steal a white space character and set it to NULL
3398 *wrt++ = '\0';
3399 // We now have a complete token
3400
3401 JavaVMOption option;
3402 option.optionString = opt_hd;
3403 option.extraInfo = NULL;
3404
3405 options->append(option); // Fill in option
3406
3407 rd++; // Advance to next character
3408 }
3409
3410 // Fill out JavaVMInitArgs structure.
3411 jint status = vm_args->set_args(options);
3412
3413 delete options;
3414 return status;
3415 }
3416
3417 void Arguments::set_shared_spaces_flags() {
3418 if (DumpSharedSpaces) {
3419 if (FailOverToOldVerifier) {
3420 // Don't fall back to the old verifier on verification failure. If a
3421 // class fails verification with the split verifier, it might fail the
3422 // CDS runtime verifier constraint check. In that case, we don't want
3423 // to share the class. We only archive classes that pass the split verifier.
3424 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3425 }
3426
3427 if (RequireSharedSpaces) {
3428 warning("Cannot dump shared archive while using shared archive");
3429 }
3430 UseSharedSpaces = false;
3431 #ifdef _LP64
3432 if (!UseCompressedOops || !UseCompressedClassPointers) {
3433 vm_exit_during_initialization(
3434 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3435 }
3436 } else {
3437 if (!UseCompressedOops || !UseCompressedClassPointers) {
3438 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3439 }
3440 #endif
3441 }
3442 }
3443
3444 // Sharing support
3445 // Construct the path to the archive
3446 char* Arguments::get_default_shared_archive_path() {
3447 char *default_archive_path;
3448 char jvm_path[JVM_MAXPATHLEN];
3449 os::jvm_path(jvm_path, sizeof(jvm_path));
3450 char *end = strrchr(jvm_path, *os::file_separator());
3451 if (end != NULL) *end = '\0';
3452 size_t jvm_path_len = strlen(jvm_path);
3453 size_t file_sep_len = strlen(os::file_separator());
3454 const size_t len = jvm_path_len + file_sep_len + 20;
3455 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3456 if (default_archive_path != NULL) {
3457 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3458 jvm_path, os::file_separator());
3459 }
3460 return default_archive_path;
3461 }
3462
3463 static char* get_shared_archive_path() {
3464 char *shared_archive_path;
3465 if (SharedArchiveFile == NULL) {
3466 shared_archive_path = Arguments::get_default_shared_archive_path();
3467 } else {
3468 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3469 }
3470 return shared_archive_path;
3471 }
3472
3473 #ifndef PRODUCT
3474 // Determine whether LogVMOutput should be implicitly turned on.
3475 static bool use_vm_log() {
3476 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3477 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3478 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3479 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3480 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3481 return true;
3482 }
3483
3484 #ifdef COMPILER1
3485 if (PrintC1Statistics) {
3486 return true;
3487 }
3488 #endif // COMPILER1
3489
3490 #ifdef COMPILER2
3491 if (PrintOptoAssembly || PrintOptoStatistics) {
3492 return true;
3493 }
3494 #endif // COMPILER2
3495
3496 return false;
3497 }
3498
3499 #endif // PRODUCT
3500
3501 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3502 for (int index = 0; index < args->nOptions; index++) {
3503 const JavaVMOption* option = args->options + index;
3504 const char* tail;
3505 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3506 return true;
3507 }
3508 }
3509 return false;
3510 }
3511
3512 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3513 const char* vm_options_file,
3514 const int vm_options_file_pos,
3515 ScopedVMInitArgs* vm_options_file_args,
3516 ScopedVMInitArgs* args_out) {
3517 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3518 if (code != JNI_OK) {
3519 return code;
3520 }
3521
3522 if (vm_options_file_args->get()->nOptions < 1) {
3523 return JNI_OK;
3524 }
3525
3526 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3527 jio_fprintf(defaultStream::error_stream(),
3528 "A VM options file may not refer to a VM options file. "
3529 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3530 "options file '%s' in options container '%s' is an error.\n",
3531 vm_options_file_args->vm_options_file_arg(),
3532 vm_options_file_args->container_name());
3533 return JNI_EINVAL;
3534 }
3535
3536 return args_out->insert(args, vm_options_file_args->get(),
3537 vm_options_file_pos);
3538 }
3539
3540 // Expand -XX:VMOptionsFile found in args_in as needed.
3541 // mod_args and args_out parameters may return values as needed.
3542 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3543 ScopedVMInitArgs* mod_args,
3544 JavaVMInitArgs** args_out) {
3545 jint code = match_special_option_and_act(args_in, mod_args);
3546 if (code != JNI_OK) {
3547 return code;
3548 }
3549
3550 if (mod_args->is_set()) {
3551 // args_in contains -XX:VMOptionsFile and mod_args contains the
3552 // original options from args_in along with the options expanded
3553 // from the VMOptionsFile. Return a short-hand to the caller.
3554 *args_out = mod_args->get();
3555 } else {
3556 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3557 }
3558 return JNI_OK;
3559 }
3560
3561 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3562 ScopedVMInitArgs* args_out) {
3563 // Remaining part of option string
3564 const char* tail;
3565 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3566
3567 for (int index = 0; index < args->nOptions; index++) {
3568 const JavaVMOption* option = args->options + index;
3569 if (ArgumentsExt::process_options(option)) {
3570 continue;
3571 }
3572 if (match_option(option, "-XX:Flags=", &tail)) {
3573 Arguments::set_jvm_flags_file(tail);
3574 continue;
3575 }
3576 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3577 if (vm_options_file_args.found_vm_options_file_arg()) {
3578 jio_fprintf(defaultStream::error_stream(),
3579 "The option '%s' is already specified in the options "
3580 "container '%s' so the specification of '%s' in the "
3581 "same options container is an error.\n",
3582 vm_options_file_args.vm_options_file_arg(),
3583 vm_options_file_args.container_name(),
3584 option->optionString);
3585 return JNI_EINVAL;
3586 }
3587 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3588 // If there's a VMOptionsFile, parse that
3589 jint code = insert_vm_options_file(args, tail, index,
3590 &vm_options_file_args, args_out);
3591 if (code != JNI_OK) {
3592 return code;
3593 }
3594 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3595 if (args_out->is_set()) {
3596 // The VMOptions file inserted some options so switch 'args'
3597 // to the new set of options, and continue processing which
3598 // preserves "last option wins" semantics.
3599 args = args_out->get();
3600 // The first option from the VMOptionsFile replaces the
3601 // current option. So we back track to process the
3602 // replacement option.
3603 index--;
3604 }
3605 continue;
3606 }
3607 if (match_option(option, "-XX:+PrintVMOptions")) {
3608 PrintVMOptions = true;
3609 continue;
3610 }
3611 if (match_option(option, "-XX:-PrintVMOptions")) {
3612 PrintVMOptions = false;
3613 continue;
3614 }
3615 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3616 IgnoreUnrecognizedVMOptions = true;
3617 continue;
3618 }
3619 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3620 IgnoreUnrecognizedVMOptions = false;
3621 continue;
3622 }
3623 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3624 JVMFlag::printFlags(tty, false);
3625 vm_exit(0);
3626 }
3627 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3628 #if INCLUDE_NMT
3629 // The launcher did not setup nmt environment variable properly.
3630 if (!MemTracker::check_launcher_nmt_support(tail)) {
3631 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3632 }
3633
3634 // Verify if nmt option is valid.
3635 if (MemTracker::verify_nmt_option()) {
3636 // Late initialization, still in single-threaded mode.
3637 if (MemTracker::tracking_level() >= NMT_summary) {
3638 MemTracker::init();
3639 }
3640 } else {
3641 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3642 }
3643 continue;
3644 #else
3645 jio_fprintf(defaultStream::error_stream(),
3646 "Native Memory Tracking is not supported in this VM\n");
3647 return JNI_ERR;
3648 #endif
3649 }
3650
3651 #ifndef PRODUCT
3652 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3653 JVMFlag::printFlags(tty, true);
3654 vm_exit(0);
3655 }
3656 #endif
3657 }
3658 return JNI_OK;
3659 }
3660
3661 static void print_options(const JavaVMInitArgs *args) {
3662 const char* tail;
3663 for (int index = 0; index < args->nOptions; index++) {
3664 const JavaVMOption *option = args->options + index;
3665 if (match_option(option, "-XX:", &tail)) {
3666 logOption(tail);
3667 }
3668 }
3669 }
3670
3671 bool Arguments::handle_deprecated_print_gc_flags() {
3672 if (PrintGC) {
3673 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3674 }
3675 if (PrintGCDetails) {
3676 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3677 }
3678
3679 if (_gc_log_filename != NULL) {
3680 // -Xloggc was used to specify a filename
3681 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3682
3683 LogTarget(Error, logging) target;
3684 LogStream errstream(target);
3685 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3686 } else if (PrintGC || PrintGCDetails) {
3687 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3688 }
3689 return true;
3690 }
3691
3692 void Arguments::handle_extra_cms_flags(const char* msg) {
3693 SpecialFlag flag;
3694 const char *flag_name = "UseConcMarkSweepGC";
3695 if (lookup_special_flag(flag_name, flag)) {
3696 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3697 warning("%s", msg);
3698 }
3699 }
3700
3701 // Parse entry point called from JNI_CreateJavaVM
3702
3703 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3704 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3705
3706 // Initialize ranges, constraints and writeables
3707 JVMFlagRangeList::init();
3708 JVMFlagConstraintList::init();
3709 JVMFlagWriteableList::init();
3710
3711 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3712 const char* hotspotrc = ".hotspotrc";
3713 bool settings_file_specified = false;
3714 bool needs_hotspotrc_warning = false;
3715 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3716 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3717
3718 // Pointers to current working set of containers
3719 JavaVMInitArgs* cur_cmd_args;
3720 JavaVMInitArgs* cur_java_options_args;
3721 JavaVMInitArgs* cur_java_tool_options_args;
3722
3723 // Containers for modified/expanded options
3724 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3725 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3726 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3727
3728
3729 jint code =
3730 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3731 if (code != JNI_OK) {
3732 return code;
3733 }
3734
3735 code = parse_java_options_environment_variable(&initial_java_options_args);
3736 if (code != JNI_OK) {
3737 return code;
3738 }
3739
3740 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3741 &mod_java_tool_options_args,
3742 &cur_java_tool_options_args);
3743 if (code != JNI_OK) {
3744 return code;
3745 }
3746
3747 code = expand_vm_options_as_needed(initial_cmd_args,
3748 &mod_cmd_args,
3749 &cur_cmd_args);
3750 if (code != JNI_OK) {
3751 return code;
3752 }
3753
3754 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3755 &mod_java_options_args,
3756 &cur_java_options_args);
3757 if (code != JNI_OK) {
3758 return code;
3759 }
3760
3761 const char* flags_file = Arguments::get_jvm_flags_file();
3762 settings_file_specified = (flags_file != NULL);
3763
3764 if (IgnoreUnrecognizedVMOptions) {
3765 cur_cmd_args->ignoreUnrecognized = true;
3766 cur_java_tool_options_args->ignoreUnrecognized = true;
3767 cur_java_options_args->ignoreUnrecognized = true;
3768 }
3769
3770 // Parse specified settings file
3771 if (settings_file_specified) {
3772 if (!process_settings_file(flags_file, true,
3773 cur_cmd_args->ignoreUnrecognized)) {
3774 return JNI_EINVAL;
3775 }
3776 } else {
3777 #ifdef ASSERT
3778 // Parse default .hotspotrc settings file
3779 if (!process_settings_file(".hotspotrc", false,
3780 cur_cmd_args->ignoreUnrecognized)) {
3781 return JNI_EINVAL;
3782 }
3783 #else
3784 struct stat buf;
3785 if (os::stat(hotspotrc, &buf) == 0) {
3786 needs_hotspotrc_warning = true;
3787 }
3788 #endif
3789 }
3790
3791 if (PrintVMOptions) {
3792 print_options(cur_java_tool_options_args);
3793 print_options(cur_cmd_args);
3794 print_options(cur_java_options_args);
3795 }
3796
3797 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3798 jint result = parse_vm_init_args(cur_java_tool_options_args,
3799 cur_java_options_args,
3800 cur_cmd_args);
3801
3802 if (result != JNI_OK) {
3803 return result;
3804 }
3805
3806 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3807 SharedArchivePath = get_shared_archive_path();
3808 if (SharedArchivePath == NULL) {
3809 return JNI_ENOMEM;
3810 }
3811
3812 // Set up VerifySharedSpaces
3813 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3814 VerifySharedSpaces = true;
3815 }
3816
3817 // Delay warning until here so that we've had a chance to process
3818 // the -XX:-PrintWarnings flag
3819 if (needs_hotspotrc_warning) {
3820 warning("%s file is present but has been ignored. "
3821 "Run with -XX:Flags=%s to load the file.",
3822 hotspotrc, hotspotrc);
3823 }
3824
3825 if (needs_module_property_warning) {
3826 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3827 " names that are reserved for internal use.");
3828 }
3829
3830 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3831 UNSUPPORTED_OPTION(UseLargePages);
3832 #endif
3833
3834 #if defined(AIX)
3835 UNSUPPORTED_OPTION(AllocateHeapAt);
3836 #endif
3837
3838 ArgumentsExt::report_unsupported_options();
3839
3840 #ifndef PRODUCT
3841 if (TraceBytecodesAt != 0) {
3842 TraceBytecodes = true;
3843 }
3844 if (CountCompiledCalls) {
3845 if (UseCounterDecay) {
3846 warning("UseCounterDecay disabled because CountCalls is set");
3847 UseCounterDecay = false;
3848 }
3849 }
3850 #endif // PRODUCT
3851
3852 if (ScavengeRootsInCode == 0) {
3853 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3854 warning("Forcing ScavengeRootsInCode non-zero");
3855 }
3856 ScavengeRootsInCode = 1;
3857 }
3858
3859 if (!handle_deprecated_print_gc_flags()) {
3860 return JNI_EINVAL;
3861 }
3862
3863 // Set object alignment values.
3864 set_object_alignment();
3865
3866 #if !INCLUDE_CDS
3867 if (DumpSharedSpaces || RequireSharedSpaces) {
3868 jio_fprintf(defaultStream::error_stream(),
3869 "Shared spaces are not supported in this VM\n");
3870 return JNI_ERR;
3871 }
3872 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3873 log_is_enabled(Info, cds)) {
3874 warning("Shared spaces are not supported in this VM");
3875 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3876 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3877 }
3878 no_shared_spaces("CDS Disabled");
3879 #endif // INCLUDE_CDS
3880
3881 return JNI_OK;
3882 }
3883
3884 jint Arguments::apply_ergo() {
3885 // Set flags based on ergonomics.
3886 jint result = set_ergonomics_flags();
3887 if (result != JNI_OK) return result;
3888
3889 // Set heap size based on available physical memory
3890 set_heap_size();
3891
3892 GCConfig::arguments()->initialize();
3893
3894 set_shared_spaces_flags();
3895
3896 // Initialize Metaspace flags and alignments
3897 Metaspace::ergo_initialize();
3898
3899 // Set compiler flags after GC is selected and GC specific
3900 // flags (LoopStripMiningIter) are set.
3901 CompilerConfig::ergo_initialize();
3902
3903 // Set bytecode rewriting flags
3904 set_bytecode_flags();
3905
3906 // Set flags if aggressive optimization flags are enabled
3907 jint code = set_aggressive_opts_flags();
3908 if (code != JNI_OK) {
3909 return code;
3910 }
3911
3912 // Turn off biased locking for locking debug mode flags,
3913 // which are subtly different from each other but neither works with
3914 // biased locking
3915 if (UseHeavyMonitors
3916 #ifdef COMPILER1
3917 || !UseFastLocking
3918 #endif // COMPILER1
3919 #if INCLUDE_JVMCI
3920 || !JVMCIUseFastLocking
3921 #endif
3922 ) {
3923 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3924 // flag set to true on command line; warn the user that they
3925 // can't enable biased locking here
3926 warning("Biased Locking is not supported with locking debug flags"
3927 "; ignoring UseBiasedLocking flag." );
3928 }
3929 UseBiasedLocking = false;
3930 }
3931
3932 #ifdef CC_INTERP
3933 // Clear flags not supported on zero.
3934 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3935 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3936 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3937 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3938 #endif // CC_INTERP
3939
3940 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3941 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3942 DebugNonSafepoints = true;
3943 }
3944
3945 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3946 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3947 }
3948
3949 #ifndef PRODUCT
3950 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3951 if (use_vm_log()) {
3952 LogVMOutput = true;
3953 }
3954 }
3955 #endif // PRODUCT
3956
3957 if (PrintCommandLineFlags) {
3958 JVMFlag::printSetFlags(tty);
3959 }
3960
3961 // Apply CPU specific policy for the BiasedLocking
3962 if (UseBiasedLocking) {
3963 if (!VM_Version::use_biased_locking() &&
3964 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3965 UseBiasedLocking = false;
3966 }
3967 }
3968 #ifdef COMPILER2
3969 if (!UseBiasedLocking) {
3970 UseOptoBiasInlining = false;
3971 }
3972 #endif
3973
3974 #if defined(IA32)
3975 // Only server compiler can optimize safepoints well enough.
3976 if (!is_server_compilation_mode_vm()) {
3977 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
3978 }
3979 #endif
3980
3981 // ThreadLocalHandshakesConstraintFunc handles the constraints.
3982 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
3983 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
3984 } else {
3985 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
3986 }
3987
3988 return JNI_OK;
3989 }
3990
3991 jint Arguments::adjust_after_os() {
3992 if (UseNUMA) {
3993 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
3994 FLAG_SET_ERGO(bool, UseNUMA, false);
3995 } else if (UseParallelGC || UseParallelOldGC) {
3996 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3997 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3998 }
3999 }
4000 // UseNUMAInterleaving is set to ON for all collectors and
4001 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4002 // such as the parallel collector for Linux and Solaris will
4003 // interleave old gen and survivor spaces on top of NUMA
4004 // allocation policy for the eden space.
4005 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4006 // all platforms and ParallelGC on Windows will interleave all
4007 // of the heap spaces across NUMA nodes.
4008 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4009 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4010 }
4011 }
4012 return JNI_OK;
4013 }
4014
4015 int Arguments::PropertyList_count(SystemProperty* pl) {
4016 int count = 0;
4017 while(pl != NULL) {
4018 count++;
4019 pl = pl->next();
4020 }
4021 return count;
4022 }
4023
4024 // Return the number of readable properties.
4025 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4026 int count = 0;
4027 while(pl != NULL) {
4028 if (pl->is_readable()) {
4029 count++;
4030 }
4031 pl = pl->next();
4032 }
4033 return count;
4034 }
4035
4036 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4037 assert(key != NULL, "just checking");
4038 SystemProperty* prop;
4039 for (prop = pl; prop != NULL; prop = prop->next()) {
4040 if (strcmp(key, prop->key()) == 0) return prop->value();
4041 }
4042 return NULL;
4043 }
4044
4045 // Return the value of the requested property provided that it is a readable property.
4046 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4047 assert(key != NULL, "just checking");
4048 SystemProperty* prop;
4049 // Return the property value if the keys match and the property is not internal or
4050 // it's the special internal property "jdk.boot.class.path.append".
4051 for (prop = pl; prop != NULL; prop = prop->next()) {
4052 if (strcmp(key, prop->key()) == 0) {
4053 if (!prop->internal()) {
4054 return prop->value();
4055 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4056 return prop->value();
4057 } else {
4058 // Property is internal and not jdk.boot.class.path.append so return NULL.
4059 return NULL;
4060 }
4061 }
4062 }
4063 return NULL;
4064 }
4065
4066 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4067 int count = 0;
4068 const char* ret_val = NULL;
4069
4070 while(pl != NULL) {
4071 if(count >= index) {
4072 ret_val = pl->key();
4073 break;
4074 }
4075 count++;
4076 pl = pl->next();
4077 }
4078
4079 return ret_val;
4080 }
4081
4082 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4083 int count = 0;
4084 char* ret_val = NULL;
4085
4086 while(pl != NULL) {
4087 if(count >= index) {
4088 ret_val = pl->value();
4089 break;
4090 }
4091 count++;
4092 pl = pl->next();
4093 }
4094
4095 return ret_val;
4096 }
4097
4098 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4099 SystemProperty* p = *plist;
4100 if (p == NULL) {
4101 *plist = new_p;
4102 } else {
4103 while (p->next() != NULL) {
4104 p = p->next();
4105 }
4106 p->set_next(new_p);
4107 }
4108 }
4109
4110 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4111 bool writeable, bool internal) {
4112 if (plist == NULL)
4113 return;
4114
4115 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4116 PropertyList_add(plist, new_p);
4117 }
4118
4119 void Arguments::PropertyList_add(SystemProperty *element) {
4120 PropertyList_add(&_system_properties, element);
4121 }
4122
4123 // This add maintains unique property key in the list.
4124 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4125 PropertyAppendable append, PropertyWriteable writeable,
4126 PropertyInternal internal) {
4127 if (plist == NULL)
4128 return;
4129
4130 // If property key exist then update with new value.
4131 SystemProperty* prop;
4132 for (prop = *plist; prop != NULL; prop = prop->next()) {
4133 if (strcmp(k, prop->key()) == 0) {
4134 if (append == AppendProperty) {
4135 prop->append_value(v);
4136 } else {
4137 prop->set_value(v);
4138 }
4139 return;
4140 }
4141 }
4142
4143 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4144 }
4145
4146 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4147 // Returns true if all of the source pointed by src has been copied over to
4148 // the destination buffer pointed by buf. Otherwise, returns false.
4149 // Notes:
4150 // 1. If the length (buflen) of the destination buffer excluding the
4151 // NULL terminator character is not long enough for holding the expanded
4152 // pid characters, it also returns false instead of returning the partially
4153 // expanded one.
4154 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4155 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4156 char* buf, size_t buflen) {
4157 const char* p = src;
4158 char* b = buf;
4159 const char* src_end = &src[srclen];
4160 char* buf_end = &buf[buflen - 1];
4161
4162 while (p < src_end && b < buf_end) {
4163 if (*p == '%') {
4164 switch (*(++p)) {
4165 case '%': // "%%" ==> "%"
4166 *b++ = *p++;
4167 break;
4168 case 'p': { // "%p" ==> current process id
4169 // buf_end points to the character before the last character so
4170 // that we could write '\0' to the end of the buffer.
4171 size_t buf_sz = buf_end - b + 1;
4172 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4173
4174 // if jio_snprintf fails or the buffer is not long enough to hold
4175 // the expanded pid, returns false.
4176 if (ret < 0 || ret >= (int)buf_sz) {
4177 return false;
4178 } else {
4179 b += ret;
4180 assert(*b == '\0', "fail in copy_expand_pid");
4181 if (p == src_end && b == buf_end + 1) {
4182 // reach the end of the buffer.
4183 return true;
4184 }
4185 }
4186 p++;
4187 break;
4188 }
4189 default :
4190 *b++ = '%';
4191 }
4192 } else {
4193 *b++ = *p++;
4194 }
4195 }
4196 *b = '\0';
4197 return (p == src_end); // return false if not all of the source was copied
4198 }