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