1 /*
2 * Copyright (c) 1997, 2024, 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 "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "compiler/compilerDefinitions.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.hpp"
37 #include "gc/shared/stringdedup/stringDedup.hpp"
38 #include "gc/shared/tlab_globals.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logConfiguration.hpp"
42 #include "logging/logStream.hpp"
43 #include "logging/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "nmt/nmtCommon.hpp"
46 #include "oops/compressedKlass.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiAgentList.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/flags/jvmFlag.hpp"
53 #include "runtime/flags/jvmFlagAccess.hpp"
54 #include "runtime/flags/jvmFlagLimit.hpp"
55 #include "runtime/globals_extension.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepoint.hpp"
59 #include "runtime/safepointMechanism.hpp"
60 #include "runtime/synchronizer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "services/management.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/checkedCast.hpp"
65 #include "utilities/debug.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/macros.hpp"
68 #include "utilities/parseInteger.hpp"
69 #include "utilities/powerOfTwo.hpp"
70 #include "utilities/stringUtils.hpp"
71 #include "utilities/systemMemoryBarrier.hpp"
72 #if INCLUDE_JFR
73 #include "jfr/jfr.hpp"
74 #endif
75
76 #include <limits>
77 #include <string.h>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 char* Arguments::_java_command = nullptr;
89 SystemProperty* Arguments::_system_properties = nullptr;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 const char* Arguments::_java_vendor_url_bug = nullptr;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
102
103 bool Arguments::_enable_preview = false;
104
105 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
106
107 // These are not set by the JDK's built-in launchers, but they can be set by
108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
109 // JavaVMOption in jni.h.
110 abort_hook_t Arguments::_abort_hook = nullptr;
111 exit_hook_t Arguments::_exit_hook = nullptr;
112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
116 SystemProperty *Arguments::_java_library_path = nullptr;
117 SystemProperty *Arguments::_java_home = nullptr;
118 SystemProperty *Arguments::_java_class_path = nullptr;
119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
120 SystemProperty *Arguments::_vm_info = nullptr;
121
122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
123 PathString *Arguments::_boot_class_path = nullptr;
124 bool Arguments::_has_jimage = false;
125
126 char* Arguments::_ext_dirs = nullptr;
127
128 // True if -Xshare:auto option was specified.
129 static bool xshare_auto_cmd_line = false;
130
131 // True if -Xint/-Xmixed/-Xcomp were specified
132 static bool mode_flag_cmd_line = false;
133
134 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
135 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
136 if (new_value == nullptr) {
137 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
138 return false;
139 }
140 if (_value != nullptr) {
141 FreeHeap(_value);
142 }
143 _value = new_value;
144 strcpy(_value, value);
145 return true;
146 }
147
148 void PathString::append_value(const char *value) {
149 char *sp;
150 size_t len = 0;
151 if (value != nullptr) {
152 len = strlen(value);
153 if (_value != nullptr) {
154 len += strlen(_value);
155 }
156 sp = AllocateHeap(len+2, mtArguments);
157 assert(sp != nullptr, "Unable to allocate space for new append path value");
158 if (sp != nullptr) {
159 if (_value != nullptr) {
160 strcpy(sp, _value);
161 strcat(sp, os::path_separator());
162 strcat(sp, value);
163 FreeHeap(_value);
164 } else {
165 strcpy(sp, value);
166 }
167 _value = sp;
168 }
169 }
170 }
171
172 PathString::PathString(const char* value) {
173 if (value == nullptr) {
174 _value = nullptr;
175 } else {
176 _value = AllocateHeap(strlen(value)+1, mtArguments);
177 strcpy(_value, value);
178 }
179 }
180
181 PathString::~PathString() {
182 if (_value != nullptr) {
183 FreeHeap(_value);
184 _value = nullptr;
185 }
186 }
187
188 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
189 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
190 size_t len = strlen(module_name) + 1;
191 _module_name = AllocateHeap(len, mtInternal);
192 strncpy(_module_name, module_name, len); // copy the trailing null
193 _path = new PathString(path);
194 }
195
196 ModulePatchPath::~ModulePatchPath() {
197 if (_module_name != nullptr) {
198 FreeHeap(_module_name);
199 _module_name = nullptr;
200 }
201 if (_path != nullptr) {
202 delete _path;
203 _path = nullptr;
204 }
205 }
206
207 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
208 if (key == nullptr) {
209 _key = nullptr;
210 } else {
211 _key = AllocateHeap(strlen(key)+1, mtArguments);
212 strcpy(_key, key);
213 }
214 _next = nullptr;
215 _internal = internal;
216 _writeable = writeable;
217 }
218
219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
220 // part of the option string.
221 static bool match_option(const JavaVMOption *option, const char* name,
222 const char** tail) {
223 size_t len = strlen(name);
224 if (strncmp(option->optionString, name, len) == 0) {
225 *tail = option->optionString + len;
226 return true;
227 } else {
228 return false;
229 }
230 }
231
232 // Check if 'option' matches 'name'. No "tail" is allowed.
233 static bool match_option(const JavaVMOption *option, const char* name) {
234 const char* tail = nullptr;
235 bool result = match_option(option, name, &tail);
236 if (tail != nullptr && *tail == '\0') {
237 return result;
238 } else {
239 return false;
240 }
241 }
242
243 // Return true if any of the strings in null-terminated array 'names' matches.
244 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
245 // the option must match exactly.
246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
247 bool tail_allowed) {
248 for (/* empty */; *names != nullptr; ++names) {
249 if (match_option(option, *names, tail)) {
250 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
251 return true;
252 }
253 }
254 }
255 return false;
256 }
257
258 #if INCLUDE_JFR
259 static bool _has_jfr_option = false; // is using JFR
260
261 // return true on failure
262 static bool match_jfr_option(const JavaVMOption** option) {
263 assert((*option)->optionString != nullptr, "invariant");
264 char* tail = nullptr;
265 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
266 _has_jfr_option = true;
267 return Jfr::on_start_flight_recording_option(option, tail);
268 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_flight_recorder_option(option, tail);
271 }
272 return false;
273 }
274
275 bool Arguments::has_jfr_option() {
276 return _has_jfr_option;
277 }
278 #endif
279
280 static void logOption(const char* opt) {
281 if (PrintVMOptions) {
282 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
283 }
284 }
285
286 bool needs_module_property_warning = false;
287
288 #define MODULE_PROPERTY_PREFIX "jdk.module."
289 #define MODULE_PROPERTY_PREFIX_LEN 11
290 #define ADDEXPORTS "addexports"
291 #define ADDEXPORTS_LEN 10
292 #define ADDREADS "addreads"
293 #define ADDREADS_LEN 8
294 #define ADDOPENS "addopens"
295 #define ADDOPENS_LEN 8
296 #define PATCH "patch"
297 #define PATCH_LEN 5
298 #define ADDMODS "addmods"
299 #define ADDMODS_LEN 7
300 #define LIMITMODS "limitmods"
301 #define LIMITMODS_LEN 9
302 #define PATH "path"
303 #define PATH_LEN 4
304 #define UPGRADE_PATH "upgrade.path"
305 #define UPGRADE_PATH_LEN 12
306 #define ENABLE_NATIVE_ACCESS "enable.native.access"
307 #define ENABLE_NATIVE_ACCESS_LEN 20
308
309 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
310 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
311 return ((strncmp(option, property, len) == 0) &&
312 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
313 }
314
315 // Return true if property starts with "jdk.module." and its ensuing chars match
316 // any of the reserved module properties.
317 // property should be passed without the leading "-D".
318 bool Arguments::is_internal_module_property(const char* property) {
319 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
320 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
321 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
322 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
323 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
324 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
325 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
326 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
327 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
328 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
329 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
330 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
331 return true;
332 }
333 }
334 return false;
335 }
336
337 // Process java launcher properties.
338 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
339 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
340 // Must do this before setting up other system properties,
341 // as some of them may depend on launcher type.
342 for (int index = 0; index < args->nOptions; index++) {
343 const JavaVMOption* option = args->options + index;
344 const char* tail;
345
346 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
347 process_java_launcher_argument(tail, option->extraInfo);
348 continue;
349 }
350 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
351 if (strcmp(tail, "true") == 0) {
352 _sun_java_launcher_is_altjvm = true;
353 }
354 continue;
355 }
356 }
357 }
358
359 // Initialize system properties key and value.
360 void Arguments::init_system_properties() {
361
362 // Set up _boot_class_path which is not a property but
363 // relies heavily on argument processing and the jdk.boot.class.path.append
364 // property. It is used to store the underlying boot class path.
365 _boot_class_path = new PathString(nullptr);
366
367 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
368 "Java Virtual Machine Specification", false));
369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
370 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
371 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
372
373 // Initialize the vm.info now, but it will need updating after argument parsing.
374 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
375
376 // Following are JVMTI agent writable properties.
377 // Properties values are set to nullptr and they are
378 // os specific they are initialized in os::init_system_properties_values().
379 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
380 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
381 _java_home = new SystemProperty("java.home", nullptr, true);
382 _java_class_path = new SystemProperty("java.class.path", "", true);
383 // jdk.boot.class.path.append is a non-writeable, internal property.
384 // It can only be set by either:
385 // - -Xbootclasspath/a:
386 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
387 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
388
389 // Add to System Property list.
390 PropertyList_add(&_system_properties, _sun_boot_library_path);
391 PropertyList_add(&_system_properties, _java_library_path);
392 PropertyList_add(&_system_properties, _java_home);
393 PropertyList_add(&_system_properties, _java_class_path);
394 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
395 PropertyList_add(&_system_properties, _vm_info);
396
397 // Set OS specific system properties values
398 os::init_system_properties_values();
399 }
400
401 // Update/Initialize System properties after JDK version number is known
402 void Arguments::init_version_specific_system_properties() {
403 enum { bufsz = 16 };
404 char buffer[bufsz];
405 const char* spec_vendor = "Oracle Corporation";
406 uint32_t spec_version = JDK_Version::current().major_version();
407
408 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
409
410 PropertyList_add(&_system_properties,
411 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
412 PropertyList_add(&_system_properties,
413 new SystemProperty("java.vm.specification.version", buffer, false));
414 PropertyList_add(&_system_properties,
415 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
416 }
417
418 /*
419 * -XX argument processing:
420 *
421 * -XX arguments are defined in several places, such as:
422 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
423 * -XX arguments are parsed in parse_argument().
424 * -XX argument bounds checking is done in check_vm_args_consistency().
425 *
426 * Over time -XX arguments may change. There are mechanisms to handle common cases:
427 *
428 * ALIASED: An option that is simply another name for another option. This is often
429 * part of the process of deprecating a flag, but not all aliases need
430 * to be deprecated.
431 *
432 * Create an alias for an option by adding the old and new option names to the
433 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
434 *
435 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
436 * support may be removed in the future. Both regular and aliased options may be
437 * deprecated.
438 *
439 * Add a deprecation warning for an option (or alias) by adding an entry in the
440 * "special_jvm_flags" table and setting the "deprecated_in" field.
441 * Often an option "deprecated" in one major release will
442 * be made "obsolete" in the next. In this case the entry should also have its
443 * "obsolete_in" field set.
444 *
445 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
446 * on the command line. A warning is printed to let the user know that option might not
447 * be accepted in the future.
448 *
449 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
450 * table and setting the "obsolete_in" field.
451 *
452 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
453 * to the current JDK version. The system will flatly refuse to admit the existence of
454 * the flag. This allows a flag to die automatically over JDK releases.
455 *
456 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
457 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
458 * - Newly obsolete or expired deprecated options should have their global variable
459 * definitions removed (from globals.hpp, etc) and related implementations removed.
460 *
461 * Recommended approach for removing options:
462 *
463 * To remove options commonly used by customers (e.g. product -XX options), use
464 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
465 *
466 * To remove internal options (e.g. diagnostic, experimental, develop options), use
467 * a 2-step model adding major release numbers to the obsolete and expire columns.
468 *
469 * To change the name of an option, use the alias table as well as a 2-step
470 * model adding major release numbers to the deprecate and expire columns.
471 * Think twice about aliasing commonly used customer options.
472 *
473 * There are times when it is appropriate to leave a future release number as undefined.
474 *
475 * Tests: Aliases should be tested in VMAliasOptions.java.
476 * Deprecated options should be tested in VMDeprecatedOptions.java.
477 */
478
479 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
480 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
481 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
482 // the command-line as usual, but will issue a warning.
483 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
484 // the command-line, while issuing a warning and ignoring the flag value.
485 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
486 // existence of the flag.
487 //
488 // MANUAL CLEANUP ON JDK VERSION UPDATES:
489 // This table ensures that the handling of options will update automatically when the JDK
490 // version is incremented, but the source code needs to be cleanup up manually:
491 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
492 // variable should be removed, as well as users of the variable.
493 // - As "deprecated" options age into "obsolete" options, move the entry into the
494 // "Obsolete Flags" section of the table.
495 // - All expired options should be removed from the table.
496 static SpecialFlag const special_jvm_flags[] = {
497 // -------------- Deprecated Flags --------------
498 // --- Non-alias flags - sorted by obsolete_in then expired_in:
499 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
501 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
502 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
503 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
504 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
505 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
506 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
507 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
508 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
509 { "RegisterFinalizersAtInit", JDK_Version::jdk(22), JDK_Version::jdk(23), JDK_Version::jdk(24) },
510
511 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
512 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
513 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
514 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
515
516 // -------------- Obsolete Flags - sorted by expired_in --------------
517
518 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
519 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
520 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
521 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
522 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
523 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
524
525 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
526 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
527 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
528 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
529 { "DoReserveCopyInSuperWord", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
530 { "UseCounterDecay", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
531
532 #ifdef LINUX
533 { "UseHugeTLBFS", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
534 { "UseSHM", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
535 #endif
536
537 #ifdef ASSERT
538 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
539 #endif
540
541 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
542 // These entries will generate build errors. Their purpose is to test the macros.
543 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
544 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
545 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
546 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
547 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
548 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
549 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
550 #endif
551
552 { nullptr, JDK_Version(0), JDK_Version(0) }
553 };
554
555 // Flags that are aliases for other flags.
556 typedef struct {
557 const char* alias_name;
558 const char* real_name;
559 } AliasedFlag;
560
561 static AliasedFlag const aliased_jvm_flags[] = {
562 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
563 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
564 { nullptr, nullptr}
565 };
566
567 // Return true if "v" is less than "other", where "other" may be "undefined".
568 static bool version_less_than(JDK_Version v, JDK_Version other) {
569 assert(!v.is_undefined(), "must be defined");
570 if (!other.is_undefined() && v.compare(other) >= 0) {
571 return false;
572 } else {
573 return true;
574 }
575 }
576
577 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
578 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
579 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
580 flag = special_jvm_flags[i];
581 return true;
582 }
583 }
584 return false;
585 }
586
587 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
588 assert(version != nullptr, "Must provide a version buffer");
589 SpecialFlag flag;
590 if (lookup_special_flag(flag_name, flag)) {
591 if (!flag.obsolete_in.is_undefined()) {
592 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
593 *version = flag.obsolete_in;
594 // This flag may have been marked for obsoletion in this version, but we may not
595 // have actually removed it yet. Rather than ignoring it as soon as we reach
596 // this version we allow some time for the removal to happen. So if the flag
597 // still actually exists we process it as normal, but issue an adjusted warning.
598 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
599 if (real_flag != nullptr) {
600 char version_str[256];
601 version->to_string(version_str, sizeof(version_str));
602 warning("Temporarily processing option %s; support is scheduled for removal in %s",
603 flag_name, version_str);
604 return false;
605 }
606 return true;
607 }
608 }
609 }
610 return false;
611 }
612
613 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
614 assert(version != nullptr, "Must provide a version buffer");
615 SpecialFlag flag;
616 if (lookup_special_flag(flag_name, flag)) {
617 if (!flag.deprecated_in.is_undefined()) {
618 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
619 version_less_than(JDK_Version::current(), flag.expired_in)) {
620 *version = flag.deprecated_in;
621 return 1;
622 } else {
623 return -1;
624 }
625 }
626 }
627 return 0;
628 }
629
630 const char* Arguments::real_flag_name(const char *flag_name) {
631 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
632 const AliasedFlag& flag_status = aliased_jvm_flags[i];
633 if (strcmp(flag_status.alias_name, flag_name) == 0) {
634 return flag_status.real_name;
635 }
636 }
637 return flag_name;
638 }
639
640 #ifdef ASSERT
641 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
642 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
643 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
644 return true;
645 }
646 }
647 return false;
648 }
649
650 // Verifies the correctness of the entries in the special_jvm_flags table.
651 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
652 // version being earlier than the deprecation version, then a warning is issued
653 // and verification fails - by returning false. If it is detected that the table
654 // is out of date, with respect to the current version, then ideally a warning is
655 // issued but verification does not fail. This allows the VM to operate when the
656 // version is first updated, without needing to update all the impacted flags at
657 // the same time. In practice we can't issue the warning immediately when the version
658 // is updated as it occurs for every test and some tests are not prepared to handle
659 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
660 // if the check_globals flag is true, and in addition allow a grace period and only
661 // check for stale flags when we hit build 25 (which is far enough into the 6 month
662 // release cycle that all flag updates should have been processed, whilst still
663 // leaving time to make the change before RDP2).
664 // We use a gtest to call this, passing true, so that we can detect stale flags before
665 // the end of the release cycle.
666
667 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
668
669 bool Arguments::verify_special_jvm_flags(bool check_globals) {
670 bool success = true;
671 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
672 const SpecialFlag& flag = special_jvm_flags[i];
673 if (lookup_special_flag(flag.name, i)) {
674 warning("Duplicate special flag declaration \"%s\"", flag.name);
675 success = false;
676 }
677 if (flag.deprecated_in.is_undefined() &&
678 flag.obsolete_in.is_undefined()) {
679 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
680 success = false;
681 }
682
683 if (!flag.deprecated_in.is_undefined()) {
684 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
685 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
686 success = false;
687 }
688
689 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
690 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
691 success = false;
692 }
693 }
694
695 if (!flag.obsolete_in.is_undefined()) {
696 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
697 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
698 success = false;
699 }
700
701 // if flag has become obsolete it should not have a "globals" flag defined anymore.
702 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
703 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
704 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
705 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
706 success = false;
707 }
708 }
709
710 } else if (!flag.expired_in.is_undefined()) {
711 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
712 success = false;
713 }
714
715 if (!flag.expired_in.is_undefined()) {
716 // if flag has become expired it should not have a "globals" flag defined anymore.
717 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
718 !version_less_than(JDK_Version::current(), flag.expired_in)) {
719 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
720 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
721 success = false;
722 }
723 }
724 }
725 }
726 return success;
727 }
728 #endif
729
730 bool Arguments::atojulong(const char *s, julong* result) {
731 return parse_integer(s, result);
732 }
733
734 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
735 if (size < min_size) return arg_too_small;
736 if (size > max_size) return arg_too_big;
737 return arg_in_range;
738 }
739
740 // Describe an argument out of range error
741 void Arguments::describe_range_error(ArgsRange errcode) {
742 switch(errcode) {
743 case arg_too_big:
744 jio_fprintf(defaultStream::error_stream(),
745 "The specified size exceeds the maximum "
746 "representable size.\n");
747 break;
748 case arg_too_small:
749 case arg_unreadable:
750 case arg_in_range:
751 // do nothing for now
752 break;
753 default:
754 ShouldNotReachHere();
755 }
756 }
757
758 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
759 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
760 return true;
761 } else {
762 return false;
763 }
764 }
765
766 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
767 // strtod allows leading whitespace, but our flag format does not.
768 if (*value == '\0' || isspace(*value)) {
769 return false;
770 }
771 char* end;
772 errno = 0;
773 double v = strtod(value, &end);
774 if ((errno != 0) || (*end != 0)) {
775 return false;
776 }
777 if (g_isnan(v) || !g_isfinite(v)) {
778 // Currently we cannot handle these special values.
779 return false;
780 }
781
782 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
783 return true;
784 }
785 return false;
786 }
787
788 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
789 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
790
791 if (flag->is_int()) {
792 int v;
793 if (parse_integer(value, &v)) {
794 result = JVMFlagAccess::set_int(flag, &v, origin);
795 }
796 } else if (flag->is_uint()) {
797 uint v;
798 if (parse_integer(value, &v)) {
799 result = JVMFlagAccess::set_uint(flag, &v, origin);
800 }
801 } else if (flag->is_intx()) {
802 intx v;
803 if (parse_integer(value, &v)) {
804 result = JVMFlagAccess::set_intx(flag, &v, origin);
805 }
806 } else if (flag->is_uintx()) {
807 uintx v;
808 if (parse_integer(value, &v)) {
809 result = JVMFlagAccess::set_uintx(flag, &v, origin);
810 }
811 } else if (flag->is_uint64_t()) {
812 uint64_t v;
813 if (parse_integer(value, &v)) {
814 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
815 }
816 } else if (flag->is_size_t()) {
817 size_t v;
818 if (parse_integer(value, &v)) {
819 result = JVMFlagAccess::set_size_t(flag, &v, origin);
820 }
821 }
822
823 return result == JVMFlag::SUCCESS;
824 }
825
826 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
827 if (value[0] == '\0') {
828 value = nullptr;
829 }
830 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
831 // Contract: JVMFlag always returns a pointer that needs freeing.
832 FREE_C_HEAP_ARRAY(char, value);
833 return true;
834 }
835
836 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
837 const char* old_value = "";
838 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
839 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
840 size_t new_len = strlen(new_value);
841 const char* value;
842 char* free_this_too = nullptr;
843 if (old_len == 0) {
844 value = new_value;
845 } else if (new_len == 0) {
846 value = old_value;
847 } else {
848 size_t length = old_len + 1 + new_len + 1;
849 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
850 // each new setting adds another LINE to the switch:
851 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
852 value = buf;
853 free_this_too = buf;
854 }
855 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
856 // JVMFlag always returns a pointer that needs freeing.
857 FREE_C_HEAP_ARRAY(char, value);
858 // JVMFlag made its own copy, so I must delete my own temp. buffer.
859 FREE_C_HEAP_ARRAY(char, free_this_too);
860 return true;
861 }
862
863 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
864 const char* real_name = real_flag_name(arg);
865 JDK_Version since = JDK_Version();
866 switch (is_deprecated_flag(arg, &since)) {
867 case -1: {
868 // Obsolete or expired, so don't process normally,
869 // but allow for an obsolete flag we're still
870 // temporarily allowing.
871 if (!is_obsolete_flag(arg, &since)) {
872 return real_name;
873 }
874 // Note if we're not considered obsolete then we can't be expired either
875 // as obsoletion must come first.
876 return nullptr;
877 }
878 case 0:
879 return real_name;
880 case 1: {
881 char version[256];
882 since.to_string(version, sizeof(version));
883 if (real_name != arg) {
884 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
885 arg, version, real_name);
886 } else {
887 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
888 arg, version);
889 }
890 return real_name;
891 }
892 }
893 ShouldNotReachHere();
894 return nullptr;
895 }
896
897 #define BUFLEN 255
898
899 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
900 char name_copied[BUFLEN+1];
901 if (name[name_length] != 0) {
902 if (name_length > BUFLEN) {
903 return nullptr;
904 } else {
905 strncpy(name_copied, name, name_length);
906 name_copied[name_length] = '\0';
907 name = name_copied;
908 }
909 }
910
911 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
912 if (real_name == nullptr) {
913 return nullptr;
914 }
915 JVMFlag* flag = JVMFlag::find_flag(real_name);
916 return flag;
917 }
918
919 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
920 bool is_bool = false;
921 bool bool_val = false;
922 char c = *arg;
923 if (c == '+' || c == '-') {
924 is_bool = true;
925 bool_val = (c == '+');
926 arg++;
927 }
928
929 const char* name = arg;
930 while (true) {
931 c = *arg;
932 if (isalnum(c) || (c == '_')) {
933 ++arg;
934 } else {
935 break;
936 }
937 }
938
939 size_t name_len = size_t(arg - name);
940 if (name_len == 0) {
941 return false;
942 }
943
944 JVMFlag* flag = find_jvm_flag(name, name_len);
945 if (flag == nullptr) {
946 return false;
947 }
948
949 if (is_bool) {
950 if (*arg != 0) {
951 // Error -- extra characters such as -XX:+BoolFlag=123
952 return false;
953 }
954 return set_bool_flag(flag, bool_val, origin);
955 }
956
957 if (arg[0] == '=') {
958 const char* value = arg + 1;
959 if (flag->is_ccstr()) {
960 if (flag->ccstr_accumulates()) {
961 return append_to_string_flag(flag, value, origin);
962 } else {
963 return set_string_flag(flag, value, origin);
964 }
965 } else if (flag->is_double()) {
966 return set_fp_numeric_flag(flag, value, origin);
967 } else {
968 return set_numeric_flag(flag, value, origin);
969 }
970 }
971
972 if (arg[0] == ':' && arg[1] == '=') {
973 // -XX:Foo:=xxx will reset the string flag to the given value.
974 const char* value = arg + 2;
975 return set_string_flag(flag, value, origin);
976 }
977
978 return false;
979 }
980
981 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
982 assert(bldarray != nullptr, "illegal argument");
983
984 if (arg == nullptr) {
985 return;
986 }
987
988 int new_count = *count + 1;
989
990 // expand the array and add arg to the last element
991 if (*bldarray == nullptr) {
992 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
993 } else {
994 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
995 }
996 (*bldarray)[*count] = os::strdup_check_oom(arg);
997 *count = new_count;
998 }
999
1000 void Arguments::build_jvm_args(const char* arg) {
1001 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1002 }
1003
1004 void Arguments::build_jvm_flags(const char* arg) {
1005 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1006 }
1007
1008 // utility function to return a string that concatenates all
1009 // strings in a given char** array
1010 const char* Arguments::build_resource_string(char** args, int count) {
1011 if (args == nullptr || count == 0) {
1012 return nullptr;
1013 }
1014 size_t length = 0;
1015 for (int i = 0; i < count; i++) {
1016 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1017 }
1018 char* s = NEW_RESOURCE_ARRAY(char, length);
1019 char* dst = s;
1020 for (int j = 0; j < count; j++) {
1021 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1022 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1023 dst += offset;
1024 length -= offset;
1025 }
1026 return (const char*) s;
1027 }
1028
1029 void Arguments::print_on(outputStream* st) {
1030 st->print_cr("VM Arguments:");
1031 if (num_jvm_flags() > 0) {
1032 st->print("jvm_flags: "); print_jvm_flags_on(st);
1033 st->cr();
1034 }
1035 if (num_jvm_args() > 0) {
1036 st->print("jvm_args: "); print_jvm_args_on(st);
1037 st->cr();
1038 }
1039 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1040 if (_java_class_path != nullptr) {
1041 char* path = _java_class_path->value();
1042 size_t len = strlen(path);
1043 st->print("java_class_path (initial): ");
1044 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1045 if (len == 0) {
1046 st->print_raw_cr("<not set>");
1047 } else {
1048 st->print_raw_cr(path, len);
1049 }
1050 }
1051 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1052 }
1053
1054 void Arguments::print_summary_on(outputStream* st) {
1055 // Print the command line. Environment variables that are helpful for
1056 // reproducing the problem are written later in the hs_err file.
1057 // flags are from setting file
1058 if (num_jvm_flags() > 0) {
1059 st->print_raw("Settings File: ");
1060 print_jvm_flags_on(st);
1061 st->cr();
1062 }
1063 // args are the command line and environment variable arguments.
1064 st->print_raw("Command Line: ");
1065 if (num_jvm_args() > 0) {
1066 print_jvm_args_on(st);
1067 }
1068 // this is the classfile and any arguments to the java program
1069 if (java_command() != nullptr) {
1070 st->print("%s", java_command());
1071 }
1072 st->cr();
1073 }
1074
1075 void Arguments::print_jvm_flags_on(outputStream* st) {
1076 if (_num_jvm_flags > 0) {
1077 for (int i=0; i < _num_jvm_flags; i++) {
1078 st->print("%s ", _jvm_flags_array[i]);
1079 }
1080 }
1081 }
1082
1083 void Arguments::print_jvm_args_on(outputStream* st) {
1084 if (_num_jvm_args > 0) {
1085 for (int i=0; i < _num_jvm_args; i++) {
1086 st->print("%s ", _jvm_args_array[i]);
1087 }
1088 }
1089 }
1090
1091 bool Arguments::process_argument(const char* arg,
1092 jboolean ignore_unrecognized,
1093 JVMFlagOrigin origin) {
1094 JDK_Version since = JDK_Version();
1095
1096 if (parse_argument(arg, origin)) {
1097 return true;
1098 }
1099
1100 // Determine if the flag has '+', '-', or '=' characters.
1101 bool has_plus_minus = (*arg == '+' || *arg == '-');
1102 const char* const argname = has_plus_minus ? arg + 1 : arg;
1103
1104 size_t arg_len;
1105 const char* equal_sign = strchr(argname, '=');
1106 if (equal_sign == nullptr) {
1107 arg_len = strlen(argname);
1108 } else {
1109 arg_len = equal_sign - argname;
1110 }
1111
1112 // Only make the obsolete check for valid arguments.
1113 if (arg_len <= BUFLEN) {
1114 // Construct a string which consists only of the argument name without '+', '-', or '='.
1115 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1116 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1117 if (is_obsolete_flag(stripped_argname, &since)) {
1118 char version[256];
1119 since.to_string(version, sizeof(version));
1120 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1121 return true;
1122 }
1123 }
1124
1125 // For locked flags, report a custom error message if available.
1126 // Otherwise, report the standard unrecognized VM option.
1127 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1128 if (found_flag != nullptr) {
1129 char locked_message_buf[BUFLEN];
1130 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1131 if (strlen(locked_message_buf) == 0) {
1132 if (found_flag->is_bool() && !has_plus_minus) {
1133 jio_fprintf(defaultStream::error_stream(),
1134 "Missing +/- setting for VM option '%s'\n", argname);
1135 } else if (!found_flag->is_bool() && has_plus_minus) {
1136 jio_fprintf(defaultStream::error_stream(),
1137 "Unexpected +/- setting in VM option '%s'\n", argname);
1138 } else {
1139 jio_fprintf(defaultStream::error_stream(),
1140 "Improperly specified VM option '%s'\n", argname);
1141 }
1142 } else {
1143 #ifdef PRODUCT
1144 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1145 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1146 if (ignore_unrecognized && mismatched) {
1147 return true;
1148 }
1149 #endif
1150 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1151 }
1152 } else {
1153 if (ignore_unrecognized) {
1154 return true;
1155 }
1156 jio_fprintf(defaultStream::error_stream(),
1157 "Unrecognized VM option '%s'\n", argname);
1158 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1159 if (fuzzy_matched != nullptr) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Did you mean '%s%s%s'?\n",
1162 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1163 fuzzy_matched->name(),
1164 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1165 }
1166 }
1167
1168 // allow for commandline "commenting out" options like -XX:#+Verbose
1169 return arg[0] == '#';
1170 }
1171
1172 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1173 FILE* stream = os::fopen(file_name, "rb");
1174 if (stream == nullptr) {
1175 if (should_exist) {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Could not open settings file %s\n", file_name);
1178 return false;
1179 } else {
1180 return true;
1181 }
1182 }
1183
1184 char token[1024];
1185 int pos = 0;
1186
1187 bool in_white_space = true;
1188 bool in_comment = false;
1189 bool in_quote = false;
1190 int quote_c = 0;
1191 bool result = true;
1192
1193 int c = getc(stream);
1194 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1195 if (in_white_space) {
1196 if (in_comment) {
1197 if (c == '\n') in_comment = false;
1198 } else {
1199 if (c == '#') in_comment = true;
1200 else if (!isspace(c)) {
1201 in_white_space = false;
1202 token[pos++] = checked_cast<char>(c);
1203 }
1204 }
1205 } else {
1206 if (c == '\n' || (!in_quote && isspace(c))) {
1207 // token ends at newline, or at unquoted whitespace
1208 // this allows a way to include spaces in string-valued options
1209 token[pos] = '\0';
1210 logOption(token);
1211 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1212 build_jvm_flags(token);
1213 pos = 0;
1214 in_white_space = true;
1215 in_quote = false;
1216 } else if (!in_quote && (c == '\'' || c == '"')) {
1217 in_quote = true;
1218 quote_c = c;
1219 } else if (in_quote && (c == quote_c)) {
1220 in_quote = false;
1221 } else {
1222 token[pos++] = checked_cast<char>(c);
1223 }
1224 }
1225 c = getc(stream);
1226 }
1227 if (pos > 0) {
1228 token[pos] = '\0';
1229 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1230 build_jvm_flags(token);
1231 }
1232 fclose(stream);
1233 return result;
1234 }
1235
1236 //=============================================================================================================
1237 // Parsing of properties (-D)
1238
1239 const char* Arguments::get_property(const char* key) {
1240 return PropertyList_get_value(system_properties(), key);
1241 }
1242
1243 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1244 const char* eq = strchr(prop, '=');
1245 const char* key;
1246 const char* value = "";
1247
1248 if (eq == nullptr) {
1249 // property doesn't have a value, thus use passed string
1250 key = prop;
1251 } else {
1252 // property have a value, thus extract it and save to the
1253 // allocated string
1254 size_t key_len = eq - prop;
1255 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1256
1257 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1258 key = tmp_key;
1259
1260 value = &prop[key_len + 1];
1261 }
1262
1263 CDSConfig::check_system_property(key, value);
1264
1265 if (strcmp(key, "java.compiler") == 0) {
1266 // we no longer support java.compiler system property, log a warning and let it get
1267 // passed to Java, like any other system property
1268 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1269 // for applications using NONE or empty value, log a more informative message
1270 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1271 } else {
1272 warning("The java.compiler system property is obsolete and no longer supported.");
1273 }
1274 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1275 // sun.java.launcher.is_altjvm property is
1276 // private and is processed in process_sun_java_launcher_properties();
1277 // the sun.java.launcher property is passed on to the java application
1278 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1279 // append is true, writable is true, internal is false
1280 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1281 WriteableProperty, ExternalProperty);
1282 } else {
1283 if (strcmp(key, "sun.java.command") == 0) {
1284 char *old_java_command = _java_command;
1285 _java_command = os::strdup_check_oom(value, mtArguments);
1286 if (old_java_command != nullptr) {
1287 os::free(old_java_command);
1288 }
1289 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1290 // If this property is set on the command line then its value will be
1291 // displayed in VM error logs as the URL at which to submit such logs.
1292 // Normally the URL displayed in error logs is different from the value
1293 // of this system property, so a different property should have been
1294 // used here, but we leave this as-is in case someone depends upon it.
1295 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1296 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1297 // its value without going through the property list or making a Java call.
1298 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1299 if (old_java_vendor_url_bug != nullptr) {
1300 os::free((void *)old_java_vendor_url_bug);
1301 }
1302 }
1303
1304 // Create new property and add at the end of the list
1305 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1306 }
1307
1308 if (key != prop) {
1309 // SystemProperty copy passed value, thus free previously allocated
1310 // memory
1311 FreeHeap((void *)key);
1312 }
1313
1314 return true;
1315 }
1316
1317 //===========================================================================================================
1318 // Setting int/mixed/comp mode flags
1319
1320 void Arguments::set_mode_flags(Mode mode) {
1321 // Set up default values for all flags.
1322 // If you add a flag to any of the branches below,
1323 // add a default value for it here.
1324 _mode = mode;
1325
1326 // Ensure Agent_OnLoad has the correct initial values.
1327 // This may not be the final mode; mode may change later in onload phase.
1328 PropertyList_unique_add(&_system_properties, "java.vm.info",
1329 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1330
1331 UseInterpreter = true;
1332 UseCompiler = true;
1333 UseLoopCounter = true;
1334
1335 // Default values may be platform/compiler dependent -
1336 // use the saved values
1337 ClipInlining = Arguments::_ClipInlining;
1338 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1339 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1340 BackgroundCompilation = Arguments::_BackgroundCompilation;
1341
1342 // Change from defaults based on mode
1343 switch (mode) {
1344 default:
1345 ShouldNotReachHere();
1346 break;
1347 case _int:
1348 UseCompiler = false;
1349 UseLoopCounter = false;
1350 AlwaysCompileLoopMethods = false;
1351 UseOnStackReplacement = false;
1352 break;
1353 case _mixed:
1354 // same as default
1355 break;
1356 case _comp:
1357 UseInterpreter = false;
1358 BackgroundCompilation = false;
1359 ClipInlining = false;
1360 break;
1361 }
1362 }
1363
1364 // Conflict: required to use shared spaces (-Xshare:on), but
1365 // incompatible command line options were chosen.
1366 void Arguments::no_shared_spaces(const char* message) {
1367 if (RequireSharedSpaces) {
1368 jio_fprintf(defaultStream::error_stream(),
1369 "Class data sharing is inconsistent with other specified options.\n");
1370 vm_exit_during_initialization("Unable to use shared archive", message);
1371 } else {
1372 log_info(cds)("Unable to use shared archive: %s", message);
1373 UseSharedSpaces = false;
1374 }
1375 }
1376
1377 void set_object_alignment() {
1378 // Object alignment.
1379 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1380 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1381 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1382 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1383 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1384 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1385
1386 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1387 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1388
1389 // Oop encoding heap max
1390 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1391 }
1392
1393 size_t Arguments::max_heap_for_compressed_oops() {
1394 // Avoid sign flip.
1395 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1396 // We need to fit both the null page and the heap into the memory budget, while
1397 // keeping alignment constraints of the heap. To guarantee the latter, as the
1398 // null page is located before the heap, we pad the null page to the conservative
1399 // maximum alignment that the GC may ever impose upon the heap.
1400 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1401 _conservative_max_heap_alignment);
1402
1403 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1404 NOT_LP64(ShouldNotReachHere(); return 0);
1405 }
1406
1407 void Arguments::set_use_compressed_oops() {
1408 #ifdef _LP64
1409 // MaxHeapSize is not set up properly at this point, but
1410 // the only value that can override MaxHeapSize if we are
1411 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1412 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1413
1414 if (max_heap_size <= max_heap_for_compressed_oops()) {
1415 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1416 FLAG_SET_ERGO(UseCompressedOops, true);
1417 }
1418 } else {
1419 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1420 warning("Max heap size too large for Compressed Oops");
1421 FLAG_SET_DEFAULT(UseCompressedOops, false);
1422 }
1423 }
1424 #endif // _LP64
1425 }
1426
1427 void Arguments::set_use_compressed_klass_ptrs() {
1428 #ifdef _LP64
1429 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1430 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1431 #endif // _LP64
1432 }
1433
1434 void Arguments::set_conservative_max_heap_alignment() {
1435 // The conservative maximum required alignment for the heap is the maximum of
1436 // the alignments imposed by several sources: any requirements from the heap
1437 // itself and the maximum page size we may run the VM with.
1438 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1439 _conservative_max_heap_alignment = MAX4(heap_alignment,
1440 os::vm_allocation_granularity(),
1441 os::max_page_size(),
1442 GCArguments::compute_heap_alignment());
1443 }
1444
1445 jint Arguments::set_ergonomics_flags() {
1446 GCConfig::initialize();
1447
1448 set_conservative_max_heap_alignment();
1449
1450 #ifdef _LP64
1451 set_use_compressed_oops();
1452 set_use_compressed_klass_ptrs();
1453
1454 // Also checks that certain machines are slower with compressed oops
1455 // in vm_version initialization code.
1456 #endif // _LP64
1457
1458 return JNI_OK;
1459 }
1460
1461 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1462 size_t max_allocatable;
1463 size_t result = limit;
1464 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1465 // The AggressiveHeap check is a temporary workaround to avoid calling
1466 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1467 // selected. This works because AggressiveHeap implies UseParallelGC
1468 // where we know the ratio will be 1. Once the AggressiveHeap option is
1469 // removed, this can be cleaned up.
1470 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1471 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1472 result = MIN2(result, max_allocatable / fraction);
1473 }
1474 return result;
1475 }
1476
1477 // Use static initialization to get the default before parsing
1478 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1479
1480 void Arguments::set_heap_size() {
1481 julong phys_mem;
1482
1483 // If the user specified one of these options, they
1484 // want specific memory sizing so do not limit memory
1485 // based on compressed oops addressability.
1486 // Also, memory limits will be calculated based on
1487 // available os physical memory, not our MaxRAM limit,
1488 // unless MaxRAM is also specified.
1489 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1490 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1491 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1492 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1493 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1494 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1495 !FLAG_IS_DEFAULT(MaxRAM));
1496 if (override_coop_limit) {
1497 if (FLAG_IS_DEFAULT(MaxRAM)) {
1498 phys_mem = os::physical_memory();
1499 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1500 } else {
1501 phys_mem = (julong)MaxRAM;
1502 }
1503 } else {
1504 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1505 : (julong)MaxRAM;
1506 }
1507
1508
1509 // Convert deprecated flags
1510 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1511 !FLAG_IS_DEFAULT(MaxRAMFraction))
1512 MaxRAMPercentage = 100.0 / (double)MaxRAMFraction;
1513
1514 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1515 !FLAG_IS_DEFAULT(MinRAMFraction))
1516 MinRAMPercentage = 100.0 / (double)MinRAMFraction;
1517
1518 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1519 !FLAG_IS_DEFAULT(InitialRAMFraction))
1520 InitialRAMPercentage = 100.0 / (double)InitialRAMFraction;
1521
1522 // If the maximum heap size has not been set with -Xmx,
1523 // then set it as fraction of the size of physical memory,
1524 // respecting the maximum and minimum sizes of the heap.
1525 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1526 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1527 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1528 if (reasonable_min < MaxHeapSize) {
1529 // Small physical memory, so use a minimum fraction of it for the heap
1530 reasonable_max = reasonable_min;
1531 } else {
1532 // Not-small physical memory, so require a heap at least
1533 // as large as MaxHeapSize
1534 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1535 }
1536
1537 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1538 // Limit the heap size to ErgoHeapSizeLimit
1539 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1540 }
1541
1542 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1543
1544 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1545 // An initial heap size was specified on the command line,
1546 // so be sure that the maximum size is consistent. Done
1547 // after call to limit_heap_by_allocatable_memory because that
1548 // method might reduce the allocation size.
1549 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1550 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1551 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1552 }
1553
1554 #ifdef _LP64
1555 if (UseCompressedOops || UseCompressedClassPointers) {
1556 // HeapBaseMinAddress can be greater than default but not less than.
1557 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1558 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1559 // matches compressed oops printing flags
1560 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1561 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1562 DefaultHeapBaseMinAddress,
1563 DefaultHeapBaseMinAddress/G,
1564 HeapBaseMinAddress);
1565 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1566 }
1567 }
1568 }
1569 if (UseCompressedOops) {
1570 // Limit the heap size to the maximum possible when using compressed oops
1571 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1572
1573 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1574 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1575 // but it should be not less than default MaxHeapSize.
1576 max_coop_heap -= HeapBaseMinAddress;
1577 }
1578
1579 // If user specified flags prioritizing os physical
1580 // memory limits, then disable compressed oops if
1581 // limits exceed max_coop_heap and UseCompressedOops
1582 // was not specified.
1583 if (reasonable_max > max_coop_heap) {
1584 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1585 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1586 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1587 "Please check the setting of MaxRAMPercentage %5.2f."
1588 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1589 FLAG_SET_ERGO(UseCompressedOops, false);
1590 } else {
1591 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1592 }
1593 }
1594 }
1595 #endif // _LP64
1596
1597 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1598 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1599 }
1600
1601 // If the minimum or initial heap_size have not been set or requested to be set
1602 // ergonomically, set them accordingly.
1603 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1604 julong reasonable_minimum = (julong)(OldSize + NewSize);
1605
1606 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1607
1608 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1609
1610 if (InitialHeapSize == 0) {
1611 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1612 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1613
1614 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1615 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1616
1617 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1618 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1619 }
1620 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1621 // synchronize with InitialHeapSize to avoid errors with the default value.
1622 if (MinHeapSize == 0) {
1623 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1624 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1625 }
1626 }
1627 }
1628
1629 // This option inspects the machine and attempts to set various
1630 // parameters to be optimal for long-running, memory allocation
1631 // intensive jobs. It is intended for machines with large
1632 // amounts of cpu and memory.
1633 jint Arguments::set_aggressive_heap_flags() {
1634 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1635 // VM, but we may not be able to represent the total physical memory
1636 // available (like having 8gb of memory on a box but using a 32bit VM).
1637 // Thus, we need to make sure we're using a julong for intermediate
1638 // calculations.
1639 julong initHeapSize;
1640 julong total_memory = os::physical_memory();
1641
1642 if (total_memory < (julong) 256 * M) {
1643 jio_fprintf(defaultStream::error_stream(),
1644 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1645 vm_exit(1);
1646 }
1647
1648 // The heap size is half of available memory, or (at most)
1649 // all of possible memory less 160mb (leaving room for the OS
1650 // when using ISM). This is the maximum; because adaptive sizing
1651 // is turned on below, the actual space used may be smaller.
1652
1653 initHeapSize = MIN2(total_memory / (julong) 2,
1654 total_memory - (julong) 160 * M);
1655
1656 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1657
1658 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1659 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1660 return JNI_EINVAL;
1661 }
1662 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1663 return JNI_EINVAL;
1664 }
1665 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1666 return JNI_EINVAL;
1667 }
1668 }
1669 if (FLAG_IS_DEFAULT(NewSize)) {
1670 // Make the young generation 3/8ths of the total heap.
1671 if (FLAG_SET_CMDLINE(NewSize,
1672 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1673 return JNI_EINVAL;
1674 }
1675 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1676 return JNI_EINVAL;
1677 }
1678 }
1679
1680 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1681 FLAG_SET_DEFAULT(UseLargePages, true);
1682 #endif
1683
1684 // Increase some data structure sizes for efficiency
1685 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1686 return JNI_EINVAL;
1687 }
1688 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1689 return JNI_EINVAL;
1690 }
1691 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1692 return JNI_EINVAL;
1693 }
1694
1695 // See the OldPLABSize comment below, but replace 'after promotion'
1696 // with 'after copying'. YoungPLABSize is the size of the survivor
1697 // space per-gc-thread buffers. The default is 4kw.
1698 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1699 return JNI_EINVAL;
1700 }
1701
1702 // OldPLABSize is the size of the buffers in the old gen that
1703 // UseParallelGC uses to promote live data that doesn't fit in the
1704 // survivor spaces. At any given time, there's one for each gc thread.
1705 // The default size is 1kw. These buffers are rarely used, since the
1706 // survivor spaces are usually big enough. For specjbb, however, there
1707 // are occasions when there's lots of live data in the young gen
1708 // and we end up promoting some of it. We don't have a definite
1709 // explanation for why bumping OldPLABSize helps, but the theory
1710 // is that a bigger PLAB results in retaining something like the
1711 // original allocation order after promotion, which improves mutator
1712 // locality. A minor effect may be that larger PLABs reduce the
1713 // number of PLAB allocation events during gc. The value of 8kw
1714 // was arrived at by experimenting with specjbb.
1715 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1716 return JNI_EINVAL;
1717 }
1718
1719 // Enable parallel GC and adaptive generation sizing
1720 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1721 return JNI_EINVAL;
1722 }
1723
1724 // Encourage steady state memory management
1725 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1726 return JNI_EINVAL;
1727 }
1728
1729 // This appears to improve mutator locality
1730 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1731 return JNI_EINVAL;
1732 }
1733
1734 return JNI_OK;
1735 }
1736
1737 // This must be called after ergonomics.
1738 void Arguments::set_bytecode_flags() {
1739 if (!RewriteBytecodes) {
1740 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1741 }
1742 }
1743
1744 // Aggressive optimization flags
1745 jint Arguments::set_aggressive_opts_flags() {
1746 #ifdef COMPILER2
1747 if (AggressiveUnboxing) {
1748 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1749 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1750 } else if (!EliminateAutoBox) {
1751 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1752 AggressiveUnboxing = false;
1753 }
1754 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1755 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1756 } else if (!DoEscapeAnalysis) {
1757 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1758 AggressiveUnboxing = false;
1759 }
1760 }
1761 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1762 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1763 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1764 }
1765 // Feed the cache size setting into the JDK
1766 char buffer[1024];
1767 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1768 if (!add_property(buffer)) {
1769 return JNI_ENOMEM;
1770 }
1771 }
1772 #endif
1773
1774 return JNI_OK;
1775 }
1776
1777 //===========================================================================================================
1778
1779 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1780 if (_sun_java_launcher != _default_java_launcher) {
1781 os::free(const_cast<char*>(_sun_java_launcher));
1782 }
1783 _sun_java_launcher = os::strdup_check_oom(launcher);
1784 }
1785
1786 bool Arguments::created_by_java_launcher() {
1787 assert(_sun_java_launcher != nullptr, "property must have value");
1788 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1789 }
1790
1791 bool Arguments::sun_java_launcher_is_altjvm() {
1792 return _sun_java_launcher_is_altjvm;
1793 }
1794
1795 //===========================================================================================================
1796 // Parsing of main arguments
1797
1798 unsigned int addreads_count = 0;
1799 unsigned int addexports_count = 0;
1800 unsigned int addopens_count = 0;
1801 unsigned int addmods_count = 0;
1802 unsigned int enable_native_access_count = 0;
1803
1804 // Check the consistency of vm_init_args
1805 bool Arguments::check_vm_args_consistency() {
1806 // Method for adding checks for flag consistency.
1807 // The intent is to warn the user of all possible conflicts,
1808 // before returning an error.
1809 // Note: Needs platform-dependent factoring.
1810 bool status = true;
1811
1812 if (TLABRefillWasteFraction == 0) {
1813 jio_fprintf(defaultStream::error_stream(),
1814 "TLABRefillWasteFraction should be a denominator, "
1815 "not " SIZE_FORMAT "\n",
1816 TLABRefillWasteFraction);
1817 status = false;
1818 }
1819
1820 status = CompilerConfig::check_args_consistency(status);
1821 #if INCLUDE_JVMCI
1822 if (status && EnableJVMCI) {
1823 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1824 AddProperty, UnwriteableProperty, InternalProperty);
1825 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1826 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1827 return false;
1828 }
1829 }
1830 }
1831 #endif
1832
1833 #if INCLUDE_JFR
1834 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1835 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1836 return false;
1837 }
1838 }
1839 #endif
1840
1841 #ifndef SUPPORT_RESERVED_STACK_AREA
1842 if (StackReservedPages != 0) {
1843 FLAG_SET_CMDLINE(StackReservedPages, 0);
1844 warning("Reserved Stack Area not supported on this platform");
1845 }
1846 #endif
1847
1848 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypePassFieldsAsArgs)) {
1849 FLAG_SET_CMDLINE(InlineTypePassFieldsAsArgs, false);
1850 warning("InlineTypePassFieldsAsArgs is not supported on this platform");
1851 }
1852
1853 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypeReturnedAsFields)) {
1854 FLAG_SET_CMDLINE(InlineTypeReturnedAsFields, false);
1855 warning("InlineTypeReturnedAsFields is not supported on this platform");
1856 }
1857
1858 // Valhalla missing LM_LIGHTWEIGHT support just now
1859 if (EnableValhalla && LockingMode != LM_LEGACY) {
1860 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1861 }
1862 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1863 if (LockingMode == LM_LIGHTWEIGHT) {
1864 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1865 warning("New lightweight locking not supported on this platform");
1866 }
1867 #endif
1868
1869 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1870 if (LockingMode == LM_MONITOR) {
1871 jio_fprintf(defaultStream::error_stream(),
1872 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1873 return false;
1874 }
1875 #endif
1876 #if defined(X86) && !defined(ZERO)
1877 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
1878 jio_fprintf(defaultStream::error_stream(),
1879 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n");
1880
1881 return false;
1882 }
1883 #endif
1884 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1885 jio_fprintf(defaultStream::error_stream(),
1886 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1887 return false;
1888 }
1889 return status;
1890 }
1891
1892 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1893 const char* option_type) {
1894 if (ignore) return false;
1895
1896 const char* spacer = " ";
1897 if (option_type == nullptr) {
1898 option_type = ++spacer; // Set both to the empty string.
1899 }
1900
1901 jio_fprintf(defaultStream::error_stream(),
1902 "Unrecognized %s%soption: %s\n", option_type, spacer,
1903 option->optionString);
1904 return true;
1905 }
1906
1907 static const char* user_assertion_options[] = {
1908 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1909 };
1910
1911 static const char* system_assertion_options[] = {
1912 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1913 };
1914
1915 bool Arguments::parse_uint(const char* value,
1916 uint* uint_arg,
1917 uint min_size) {
1918 uint n;
1919 if (!parse_integer(value, &n)) {
1920 return false;
1921 }
1922 if (n >= min_size) {
1923 *uint_arg = n;
1924 return true;
1925 } else {
1926 return false;
1927 }
1928 }
1929
1930 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1931 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1932 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1933 char* property = AllocateHeap(prop_len, mtArguments);
1934 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1935 if (ret < 0 || ret >= (int)prop_len) {
1936 FreeHeap(property);
1937 return false;
1938 }
1939 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1940 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1941 // that multiple occurrences of the associated flag just causes the existing property value to be
1942 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1943 // to a property after we have finished flag processing.
1944 bool added = add_property(property, WriteableProperty, internal);
1945 FreeHeap(property);
1946 return added;
1947 }
1948
1949 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1950 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1951 const unsigned int props_count_limit = 1000;
1952 const int max_digits = 3;
1953 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1954
1955 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1956 if (count < props_count_limit) {
1957 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1958 char* property = AllocateHeap(prop_len, mtArguments);
1959 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1960 if (ret < 0 || ret >= (int)prop_len) {
1961 FreeHeap(property);
1962 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1963 return false;
1964 }
1965 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1966 FreeHeap(property);
1967 return added;
1968 }
1969
1970 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1971 return false;
1972 }
1973
1974 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1975 julong* long_arg,
1976 julong min_size,
1977 julong max_size) {
1978 if (!parse_integer(s, long_arg)) return arg_unreadable;
1979 return check_memory_size(*long_arg, min_size, max_size);
1980 }
1981
1982 // Parse JavaVMInitArgs structure
1983
1984 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1985 const JavaVMInitArgs *java_tool_options_args,
1986 const JavaVMInitArgs *java_options_args,
1987 const JavaVMInitArgs *cmd_line_args) {
1988 // Save default settings for some mode flags
1989 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1990 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1991 Arguments::_ClipInlining = ClipInlining;
1992 Arguments::_BackgroundCompilation = BackgroundCompilation;
1993
1994 // Remember the default value of SharedBaseAddress.
1995 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1996
1997 // Setup flags for mixed which is the default
1998 set_mode_flags(_mixed);
1999
2000 // Parse args structure generated from java.base vm options resource
2001 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
2002 if (result != JNI_OK) {
2003 return result;
2004 }
2005
2006 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2007 // variable (if present).
2008 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
2009 if (result != JNI_OK) {
2010 return result;
2011 }
2012
2013 // Parse args structure generated from the command line flags.
2014 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
2015 if (result != JNI_OK) {
2016 return result;
2017 }
2018
2019 // Parse args structure generated from the _JAVA_OPTIONS environment
2020 // variable (if present) (mimics classic VM)
2021 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
2022 if (result != JNI_OK) {
2023 return result;
2024 }
2025
2026 // Disable CDS for exploded image
2027 if (!has_jimage()) {
2028 no_shared_spaces("CDS disabled on exploded JDK");
2029 }
2030
2031 // We need to ensure processor and memory resources have been properly
2032 // configured - which may rely on arguments we just processed - before
2033 // doing the final argument processing. Any argument processing that
2034 // needs to know about processor and memory resources must occur after
2035 // this point.
2036
2037 os::init_container_support();
2038
2039 SystemMemoryBarrier::initialize();
2040
2041 // Do final processing now that all arguments have been parsed
2042 result = finalize_vm_init_args();
2043 if (result != JNI_OK) {
2044 return result;
2045 }
2046
2047 return JNI_OK;
2048 }
2049
2050 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2051 // represents a valid JDWP agent. is_path==true denotes that we
2052 // are dealing with -agentpath (case where name is a path), otherwise with
2053 // -agentlib
2054 bool valid_jdwp_agent(char *name, bool is_path) {
2055 char *_name;
2056 const char *_jdwp = "jdwp";
2057 size_t _len_jdwp, _len_prefix;
2058
2059 if (is_path) {
2060 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2061 return false;
2062 }
2063
2064 _name++; // skip past last path separator
2065 _len_prefix = strlen(JNI_LIB_PREFIX);
2066
2067 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2068 return false;
2069 }
2070
2071 _name += _len_prefix;
2072 _len_jdwp = strlen(_jdwp);
2073
2074 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2075 _name += _len_jdwp;
2076 }
2077 else {
2078 return false;
2079 }
2080
2081 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2082 return false;
2083 }
2084
2085 return true;
2086 }
2087
2088 if (strcmp(name, _jdwp) == 0) {
2089 return true;
2090 }
2091
2092 return false;
2093 }
2094
2095 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2096 // --patch-module=<module>=<file>(<pathsep><file>)*
2097 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2098 // Find the equal sign between the module name and the path specification
2099 const char* module_equal = strchr(patch_mod_tail, '=');
2100 if (module_equal == nullptr) {
2101 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2102 return JNI_ERR;
2103 } else {
2104 // Pick out the module name
2105 size_t module_len = module_equal - patch_mod_tail;
2106 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2107 if (module_name != nullptr) {
2108 memcpy(module_name, patch_mod_tail, module_len);
2109 *(module_name + module_len) = '\0';
2110 // The path piece begins one past the module_equal sign
2111 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2112 FREE_C_HEAP_ARRAY(char, module_name);
2113 } else {
2114 return JNI_ENOMEM;
2115 }
2116 }
2117 return JNI_OK;
2118 }
2119
2120 // VALUECLASS_STR must match string used in the build
2121 #define VALUECLASS_STR "valueclasses"
2122 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2123
2124 // Finalize --patch-module args and --enable-preview related to value class module patches.
2125 // Create all numbered properties passing module patches.
2126 int Arguments::finalize_patch_module() {
2127 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2128 // are to be patched into the module.
2129 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2130 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2131 if (enable_preview() && EnableValhalla) {
2132 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2133 const char * fileSep = os::file_separator();
2134
2135 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2136 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2137 DIR* dir = os::opendir(valueclasses_dir);
2138 if (dir != nullptr) {
2139 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2140 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2141
2142 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2143 // Test if file ends-with "-valueclasses.jar"
2144 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2145 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2146 continue; // too short or not the expected suffix
2147 }
2148
2149 strcpy(module_name, entry->d_name);
2150 module_name[len] = '\0'; // truncate to just module-name
2151
2152 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2153 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2154 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2155 }
2156 FreeHeap(module_name);
2157 FreeHeap(path);
2158 os::closedir(dir);
2159 }
2160 FreeHeap(valueclasses_dir);
2161 }
2162
2163 // Create numbered properties for each module that has been patched either
2164 // by --patch-module or --enable-preview
2165 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2166 if (_patch_mod_prefix != nullptr) {
2167 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2168 unsigned int patch_mod_count = 0;
2169
2170 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2171 it != _patch_mod_prefix->end(); ++it) {
2172 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2173 (*it)->module_name(), (*it)->path_string());
2174 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2175 FreeHeap(prop_value);
2176 return JNI_ENOMEM;
2177 }
2178 }
2179 FreeHeap(prop_value);
2180 }
2181 return JNI_OK;
2182 }
2183
2184 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2185 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2186 // The min and max sizes match the values in globals.hpp, but scaled
2187 // with K. The values have been chosen so that alignment with page
2188 // size doesn't change the max value, which makes the conversions
2189 // back and forth between Xss value and ThreadStackSize value easier.
2190 // The values have also been chosen to fit inside a 32-bit signed type.
2191 const julong min_ThreadStackSize = 0;
2192 const julong max_ThreadStackSize = 1 * M;
2193
2194 // Make sure the above values match the range set in globals.hpp
2195 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2196 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2197 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2198
2199 const julong min_size = min_ThreadStackSize * K;
2200 const julong max_size = max_ThreadStackSize * K;
2201
2202 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2203
2204 julong size = 0;
2205 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2206 if (errcode != arg_in_range) {
2207 bool silent = (option == nullptr); // Allow testing to silence error messages
2208 if (!silent) {
2209 jio_fprintf(defaultStream::error_stream(),
2210 "Invalid thread stack size: %s\n", option->optionString);
2211 describe_range_error(errcode);
2212 }
2213 return JNI_EINVAL;
2214 }
2215
2216 // Internally track ThreadStackSize in units of 1024 bytes.
2217 const julong size_aligned = align_up(size, K);
2218 assert(size <= size_aligned,
2219 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2220 size, size_aligned);
2221
2222 const julong size_in_K = size_aligned / K;
2223 assert(size_in_K < (julong)max_intx,
2224 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2225 size_in_K);
2226
2227 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2228 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2229 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2230 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2231 max_expanded, size_in_K);
2232
2233 *out_ThreadStackSize = (intx)size_in_K;
2234
2235 return JNI_OK;
2236 }
2237
2238 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2239 // For match_option to return remaining or value part of option string
2240 const char* tail;
2241
2242 // iterate over arguments
2243 for (int index = 0; index < args->nOptions; index++) {
2244 bool is_absolute_path = false; // for -agentpath vs -agentlib
2245
2246 const JavaVMOption* option = args->options + index;
2247
2248 if (!match_option(option, "-Djava.class.path", &tail) &&
2249 !match_option(option, "-Dsun.java.command", &tail) &&
2250 !match_option(option, "-Dsun.java.launcher", &tail)) {
2251
2252 // add all jvm options to the jvm_args string. This string
2253 // is used later to set the java.vm.args PerfData string constant.
2254 // the -Djava.class.path and the -Dsun.java.command options are
2255 // omitted from jvm_args string as each have their own PerfData
2256 // string constant object.
2257 build_jvm_args(option->optionString);
2258 }
2259
2260 // -verbose:[class/module/gc/jni]
2261 if (match_option(option, "-verbose", &tail)) {
2262 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2263 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2264 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2265 } else if (!strcmp(tail, ":module")) {
2266 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2267 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2268 } else if (!strcmp(tail, ":gc")) {
2269 if (_legacyGCLogging.lastFlag == 0) {
2270 _legacyGCLogging.lastFlag = 1;
2271 }
2272 } else if (!strcmp(tail, ":jni")) {
2273 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2274 }
2275 // -da / -ea / -disableassertions / -enableassertions
2276 // These accept an optional class/package name separated by a colon, e.g.,
2277 // -da:java.lang.Thread.
2278 } else if (match_option(option, user_assertion_options, &tail, true)) {
2279 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2280 if (*tail == '\0') {
2281 JavaAssertions::setUserClassDefault(enable);
2282 } else {
2283 assert(*tail == ':', "bogus match by match_option()");
2284 JavaAssertions::addOption(tail + 1, enable);
2285 }
2286 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2287 } else if (match_option(option, system_assertion_options, &tail, false)) {
2288 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2289 JavaAssertions::setSystemClassDefault(enable);
2290 // -bootclasspath:
2291 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2292 jio_fprintf(defaultStream::output_stream(),
2293 "-Xbootclasspath is no longer a supported option.\n");
2294 return JNI_EINVAL;
2295 // -bootclasspath/a:
2296 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2297 Arguments::append_sysclasspath(tail);
2298 #if INCLUDE_CDS
2299 MetaspaceShared::disable_optimized_module_handling();
2300 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2301 #endif
2302 // -bootclasspath/p:
2303 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2304 jio_fprintf(defaultStream::output_stream(),
2305 "-Xbootclasspath/p is no longer a supported option.\n");
2306 return JNI_EINVAL;
2307 // -Xrun
2308 } else if (match_option(option, "-Xrun", &tail)) {
2309 if (tail != nullptr) {
2310 const char* pos = strchr(tail, ':');
2311 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2312 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2313 jio_snprintf(name, len + 1, "%s", tail);
2314
2315 char *options = nullptr;
2316 if(pos != nullptr) {
2317 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2318 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2319 }
2320 #if !INCLUDE_JVMTI
2321 if (strcmp(name, "jdwp") == 0) {
2322 jio_fprintf(defaultStream::error_stream(),
2323 "Debugging agents are not supported in this VM\n");
2324 return JNI_ERR;
2325 }
2326 #endif // !INCLUDE_JVMTI
2327 JvmtiAgentList::add_xrun(name, options, false);
2328 FREE_C_HEAP_ARRAY(char, name);
2329 FREE_C_HEAP_ARRAY(char, options);
2330 }
2331 } else if (match_option(option, "--add-reads=", &tail)) {
2332 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2333 return JNI_ENOMEM;
2334 }
2335 } else if (match_option(option, "--add-exports=", &tail)) {
2336 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2337 return JNI_ENOMEM;
2338 }
2339 } else if (match_option(option, "--add-opens=", &tail)) {
2340 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2341 return JNI_ENOMEM;
2342 }
2343 } else if (match_option(option, "--add-modules=", &tail)) {
2344 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2345 return JNI_ENOMEM;
2346 }
2347 } else if (match_option(option, "--enable-native-access=", &tail)) {
2348 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2349 return JNI_ENOMEM;
2350 }
2351 } else if (match_option(option, "--limit-modules=", &tail)) {
2352 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2353 return JNI_ENOMEM;
2354 }
2355 } else if (match_option(option, "--module-path=", &tail)) {
2356 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2357 return JNI_ENOMEM;
2358 }
2359 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2360 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2361 return JNI_ENOMEM;
2362 }
2363 } else if (match_option(option, "--patch-module=", &tail)) {
2364 // --patch-module=<module>=<file>(<pathsep><file>)*
2365 int res = process_patch_mod_option(tail);
2366 if (res != JNI_OK) {
2367 return res;
2368 }
2369 } else if (match_option(option, "--illegal-access=", &tail)) {
2370 char version[256];
2371 JDK_Version::jdk(17).to_string(version, sizeof(version));
2372 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2373 // -agentlib and -agentpath
2374 } else if (match_option(option, "-agentlib:", &tail) ||
2375 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2376 if(tail != nullptr) {
2377 const char* pos = strchr(tail, '=');
2378 char* name;
2379 if (pos == nullptr) {
2380 name = os::strdup_check_oom(tail, mtArguments);
2381 } else {
2382 size_t len = pos - tail;
2383 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2384 memcpy(name, tail, len);
2385 name[len] = '\0';
2386 }
2387
2388 char *options = nullptr;
2389 if(pos != nullptr) {
2390 options = os::strdup_check_oom(pos + 1, mtArguments);
2391 }
2392 #if !INCLUDE_JVMTI
2393 if (valid_jdwp_agent(name, is_absolute_path)) {
2394 jio_fprintf(defaultStream::error_stream(),
2395 "Debugging agents are not supported in this VM\n");
2396 return JNI_ERR;
2397 }
2398 #endif // !INCLUDE_JVMTI
2399 JvmtiAgentList::add(name, options, is_absolute_path);
2400 os::free(name);
2401 os::free(options);
2402 }
2403 // -javaagent
2404 } else if (match_option(option, "-javaagent:", &tail)) {
2405 #if !INCLUDE_JVMTI
2406 jio_fprintf(defaultStream::error_stream(),
2407 "Instrumentation agents are not supported in this VM\n");
2408 return JNI_ERR;
2409 #else
2410 if (tail != nullptr) {
2411 size_t length = strlen(tail) + 1;
2412 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2413 jio_snprintf(options, length, "%s", tail);
2414 JvmtiAgentList::add("instrument", options, false);
2415 FREE_C_HEAP_ARRAY(char, options);
2416
2417 // java agents need module java.instrument
2418 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2419 return JNI_ENOMEM;
2420 }
2421 }
2422 #endif // !INCLUDE_JVMTI
2423 // --enable_preview
2424 } else if (match_option(option, "--enable-preview")) {
2425 set_enable_preview();
2426 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2427 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2428 return JNI_EINVAL;
2429 }
2430 // -Xnoclassgc
2431 } else if (match_option(option, "-Xnoclassgc")) {
2432 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2433 return JNI_EINVAL;
2434 }
2435 // -Xbatch
2436 } else if (match_option(option, "-Xbatch")) {
2437 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2438 return JNI_EINVAL;
2439 }
2440 // -Xmn for compatibility with other JVM vendors
2441 } else if (match_option(option, "-Xmn", &tail)) {
2442 julong long_initial_young_size = 0;
2443 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2444 if (errcode != arg_in_range) {
2445 jio_fprintf(defaultStream::error_stream(),
2446 "Invalid initial young generation size: %s\n", option->optionString);
2447 describe_range_error(errcode);
2448 return JNI_EINVAL;
2449 }
2450 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2451 return JNI_EINVAL;
2452 }
2453 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 // -Xms
2457 } else if (match_option(option, "-Xms", &tail)) {
2458 julong size = 0;
2459 // an initial heap size of 0 means automatically determine
2460 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2461 if (errcode != arg_in_range) {
2462 jio_fprintf(defaultStream::error_stream(),
2463 "Invalid initial heap size: %s\n", option->optionString);
2464 describe_range_error(errcode);
2465 return JNI_EINVAL;
2466 }
2467 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2468 return JNI_EINVAL;
2469 }
2470 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2471 return JNI_EINVAL;
2472 }
2473 // -Xmx
2474 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2475 julong long_max_heap_size = 0;
2476 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2477 if (errcode != arg_in_range) {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "Invalid maximum heap size: %s\n", option->optionString);
2480 describe_range_error(errcode);
2481 return JNI_EINVAL;
2482 }
2483 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2484 return JNI_EINVAL;
2485 }
2486 // Xmaxf
2487 } else if (match_option(option, "-Xmaxf", &tail)) {
2488 char* err;
2489 int maxf = (int)(strtod(tail, &err) * 100);
2490 if (*err != '\0' || *tail == '\0') {
2491 jio_fprintf(defaultStream::error_stream(),
2492 "Bad max heap free percentage size: %s\n",
2493 option->optionString);
2494 return JNI_EINVAL;
2495 } else {
2496 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2497 return JNI_EINVAL;
2498 }
2499 }
2500 // Xminf
2501 } else if (match_option(option, "-Xminf", &tail)) {
2502 char* err;
2503 int minf = (int)(strtod(tail, &err) * 100);
2504 if (*err != '\0' || *tail == '\0') {
2505 jio_fprintf(defaultStream::error_stream(),
2506 "Bad min heap free percentage size: %s\n",
2507 option->optionString);
2508 return JNI_EINVAL;
2509 } else {
2510 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2511 return JNI_EINVAL;
2512 }
2513 }
2514 // -Xss
2515 } else if (match_option(option, "-Xss", &tail)) {
2516 intx value = 0;
2517 jint err = parse_xss(option, tail, &value);
2518 if (err != JNI_OK) {
2519 return err;
2520 }
2521 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2522 return JNI_EINVAL;
2523 }
2524 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2525 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2526 julong long_ReservedCodeCacheSize = 0;
2527
2528 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2529 if (errcode != arg_in_range) {
2530 jio_fprintf(defaultStream::error_stream(),
2531 "Invalid maximum code cache size: %s.\n", option->optionString);
2532 return JNI_EINVAL;
2533 }
2534 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2535 return JNI_EINVAL;
2536 }
2537 // -green
2538 } else if (match_option(option, "-green")) {
2539 jio_fprintf(defaultStream::error_stream(),
2540 "Green threads support not available\n");
2541 return JNI_EINVAL;
2542 // -native
2543 } else if (match_option(option, "-native")) {
2544 // HotSpot always uses native threads, ignore silently for compatibility
2545 // -Xrs
2546 } else if (match_option(option, "-Xrs")) {
2547 // Classic/EVM option, new functionality
2548 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2549 return JNI_EINVAL;
2550 }
2551 // -Xprof
2552 } else if (match_option(option, "-Xprof")) {
2553 char version[256];
2554 // Obsolete in JDK 10
2555 JDK_Version::jdk(10).to_string(version, sizeof(version));
2556 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2557 // -Xinternalversion
2558 } else if (match_option(option, "-Xinternalversion")) {
2559 jio_fprintf(defaultStream::output_stream(), "%s\n",
2560 VM_Version::internal_vm_info_string());
2561 vm_exit(0);
2562 #ifndef PRODUCT
2563 // -Xprintflags
2564 } else if (match_option(option, "-Xprintflags")) {
2565 JVMFlag::printFlags(tty, false);
2566 vm_exit(0);
2567 #endif
2568 // -D
2569 } else if (match_option(option, "-D", &tail)) {
2570 const char* value;
2571 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2572 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2573 // abort if -Djava.endorsed.dirs is set
2574 jio_fprintf(defaultStream::output_stream(),
2575 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2576 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2577 return JNI_EINVAL;
2578 }
2579 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2580 *value != '\0' && strcmp(value, "\"\"") != 0) {
2581 // abort if -Djava.ext.dirs is set
2582 jio_fprintf(defaultStream::output_stream(),
2583 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2584 return JNI_EINVAL;
2585 }
2586 // Check for module related properties. They must be set using the modules
2587 // options. For example: use "--add-modules=java.sql", not
2588 // "-Djdk.module.addmods=java.sql"
2589 if (is_internal_module_property(option->optionString + 2)) {
2590 needs_module_property_warning = true;
2591 continue;
2592 }
2593 if (!add_property(tail)) {
2594 return JNI_ENOMEM;
2595 }
2596 // Out of the box management support
2597 if (match_option(option, "-Dcom.sun.management", &tail)) {
2598 #if INCLUDE_MANAGEMENT
2599 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2600 return JNI_EINVAL;
2601 }
2602 // management agent in module jdk.management.agent
2603 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2604 return JNI_ENOMEM;
2605 }
2606 #else
2607 jio_fprintf(defaultStream::output_stream(),
2608 "-Dcom.sun.management is not supported in this VM.\n");
2609 return JNI_ERR;
2610 #endif
2611 }
2612 // -Xint
2613 } else if (match_option(option, "-Xint")) {
2614 set_mode_flags(_int);
2615 mode_flag_cmd_line = true;
2616 // -Xmixed
2617 } else if (match_option(option, "-Xmixed")) {
2618 set_mode_flags(_mixed);
2619 mode_flag_cmd_line = true;
2620 // -Xcomp
2621 } else if (match_option(option, "-Xcomp")) {
2622 // for testing the compiler; turn off all flags that inhibit compilation
2623 set_mode_flags(_comp);
2624 mode_flag_cmd_line = true;
2625 // -Xshare:dump
2626 } else if (match_option(option, "-Xshare:dump")) {
2627 CDSConfig::enable_dumping_static_archive();
2628 // -Xshare:on
2629 } else if (match_option(option, "-Xshare:on")) {
2630 UseSharedSpaces = true;
2631 RequireSharedSpaces = true;
2632 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2633 } else if (match_option(option, "-Xshare:auto")) {
2634 UseSharedSpaces = true;
2635 RequireSharedSpaces = false;
2636 xshare_auto_cmd_line = true;
2637 // -Xshare:off
2638 } else if (match_option(option, "-Xshare:off")) {
2639 UseSharedSpaces = false;
2640 RequireSharedSpaces = false;
2641 // -Xverify
2642 } else if (match_option(option, "-Xverify", &tail)) {
2643 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2644 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2645 return JNI_EINVAL;
2646 }
2647 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2648 return JNI_EINVAL;
2649 }
2650 } else if (strcmp(tail, ":remote") == 0) {
2651 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2652 return JNI_EINVAL;
2653 }
2654 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2655 return JNI_EINVAL;
2656 }
2657 } else if (strcmp(tail, ":none") == 0) {
2658 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2659 return JNI_EINVAL;
2660 }
2661 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2662 return JNI_EINVAL;
2663 }
2664 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2665 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2666 return JNI_EINVAL;
2667 }
2668 // -Xdebug
2669 } else if (match_option(option, "-Xdebug")) {
2670 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2671 // -Xnoagent
2672 } else if (match_option(option, "-Xnoagent")) {
2673 warning("Option -Xnoagent was deprecated in JDK 22 and will likely be removed in a future release.");
2674 } else if (match_option(option, "-Xloggc:", &tail)) {
2675 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2676 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2677 _legacyGCLogging.lastFlag = 2;
2678 _legacyGCLogging.file = os::strdup_check_oom(tail);
2679 } else if (match_option(option, "-Xlog", &tail)) {
2680 bool ret = false;
2681 if (strcmp(tail, ":help") == 0) {
2682 fileStream stream(defaultStream::output_stream());
2683 LogConfiguration::print_command_line_help(&stream);
2684 vm_exit(0);
2685 } else if (strcmp(tail, ":disable") == 0) {
2686 LogConfiguration::disable_logging();
2687 ret = true;
2688 } else if (strcmp(tail, ":async") == 0) {
2689 LogConfiguration::set_async_mode(true);
2690 ret = true;
2691 } else if (*tail == '\0') {
2692 ret = LogConfiguration::parse_command_line_arguments();
2693 assert(ret, "-Xlog without arguments should never fail to parse");
2694 } else if (*tail == ':') {
2695 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2696 }
2697 if (ret == false) {
2698 jio_fprintf(defaultStream::error_stream(),
2699 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2700 tail);
2701 return JNI_EINVAL;
2702 }
2703 // JNI hooks
2704 } else if (match_option(option, "-Xcheck", &tail)) {
2705 if (!strcmp(tail, ":jni")) {
2706 #if !INCLUDE_JNI_CHECK
2707 warning("JNI CHECKING is not supported in this VM");
2708 #else
2709 CheckJNICalls = true;
2710 #endif // INCLUDE_JNI_CHECK
2711 } else if (is_bad_option(option, args->ignoreUnrecognized,
2712 "check")) {
2713 return JNI_EINVAL;
2714 }
2715 } else if (match_option(option, "vfprintf")) {
2716 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2717 } else if (match_option(option, "exit")) {
2718 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2719 } else if (match_option(option, "abort")) {
2720 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2721 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2722 // and the last option wins.
2723 } else if (match_option(option, "-XX:+NeverTenure")) {
2724 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2734 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2735 return JNI_EINVAL;
2736 }
2737 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2738 return JNI_EINVAL;
2739 }
2740 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2741 return JNI_EINVAL;
2742 }
2743 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2744 uint max_tenuring_thresh = 0;
2745 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2746 jio_fprintf(defaultStream::error_stream(),
2747 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2748 return JNI_EINVAL;
2749 }
2750
2751 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754
2755 if (MaxTenuringThreshold == 0) {
2756 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2757 return JNI_EINVAL;
2758 }
2759 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 } else {
2763 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 }
2770 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2771 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2772 return JNI_EINVAL;
2773 }
2774 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2778 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2779 return JNI_EINVAL;
2780 }
2781 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2782 return JNI_EINVAL;
2783 }
2784 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2785 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2786 return JNI_EINVAL;
2787 }
2788 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2789 return JNI_EINVAL;
2790 }
2791 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2792 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2793 return JNI_EINVAL;
2794 }
2795 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2796 return JNI_EINVAL;
2797 }
2798 } else if (match_option(option, "--finalization=", &tail)) {
2799 if (strcmp(tail, "enabled") == 0) {
2800 InstanceKlass::set_finalization_enabled(true);
2801 } else if (strcmp(tail, "disabled") == 0) {
2802 InstanceKlass::set_finalization_enabled(false);
2803 } else {
2804 jio_fprintf(defaultStream::error_stream(),
2805 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2806 tail);
2807 return JNI_EINVAL;
2808 }
2809 #if !defined(DTRACE_ENABLED)
2810 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "DTraceMethodProbes flag is not applicable for this configuration\n");
2813 return JNI_EINVAL;
2814 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2815 jio_fprintf(defaultStream::error_stream(),
2816 "DTraceAllocProbes flag is not applicable for this configuration\n");
2817 return JNI_EINVAL;
2818 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2819 jio_fprintf(defaultStream::error_stream(),
2820 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2821 return JNI_EINVAL;
2822 #endif // !defined(DTRACE_ENABLED)
2823 #ifdef ASSERT
2824 } else if (match_option(option, "-XX:+FullGCALot")) {
2825 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 // disable scavenge before parallel mark-compact
2829 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2830 return JNI_EINVAL;
2831 }
2832 #endif
2833 #if !INCLUDE_MANAGEMENT
2834 } else if (match_option(option, "-XX:+ManagementServer")) {
2835 jio_fprintf(defaultStream::error_stream(),
2836 "ManagementServer is not supported in this VM.\n");
2837 return JNI_ERR;
2838 #endif // INCLUDE_MANAGEMENT
2839 #if INCLUDE_JVMCI
2840 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2841 if (EnableJVMCIProduct) {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2844 return JNI_EINVAL;
2845 }
2846 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2847 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2848 if (use_graal_jit) {
2849 const char* jvmci_compiler = get_property("jvmci.Compiler");
2850 if (jvmci_compiler != nullptr) {
2851 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2852 jio_fprintf(defaultStream::error_stream(),
2853 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2854 return JNI_ERR;
2855 }
2856 } else if (!add_property("jvmci.Compiler=graal")) {
2857 return JNI_ENOMEM;
2858 }
2859 }
2860
2861 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2862 if (EnableJVMCIProduct) {
2863 continue;
2864 }
2865 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2866 // Allow this flag if it has been unlocked.
2867 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2868 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Unable to enable JVMCI in product mode\n");
2871 return JNI_ERR;
2872 }
2873 }
2874 // The flag was locked so process normally to report that error
2875 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2876 return JNI_EINVAL;
2877 }
2878 #endif // INCLUDE_JVMCI
2879 #if INCLUDE_JFR
2880 } else if (match_jfr_option(&option)) {
2881 return JNI_EINVAL;
2882 #endif
2883 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2884 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2885 // already been handled
2886 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2887 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2888 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2889 return JNI_EINVAL;
2890 }
2891 }
2892 // Unknown option
2893 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2894 return JNI_ERR;
2895 }
2896 }
2897
2898 // PrintSharedArchiveAndExit will turn on
2899 // -Xshare:on
2900 // -Xlog:class+path=info
2901 if (PrintSharedArchiveAndExit) {
2902 UseSharedSpaces = true;
2903 RequireSharedSpaces = true;
2904 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2905 }
2906
2907 fix_appclasspath();
2908
2909 return JNI_OK;
2910 }
2911
2912 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2913 if (!allow_cds) {
2914 CDSConfig::set_module_patching_disables_cds();
2915 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2916 CDSConfig::set_java_base_module_patching_disables_cds();
2917 }
2918 }
2919
2920 // Create GrowableArray lazily, only if --patch-module has been specified
2921 if (_patch_mod_prefix == nullptr) {
2922 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2923 }
2924
2925 // Scan patches for matching module
2926 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2927 return (strcmp(module_name, patch->module_name()) == 0);
2928 });
2929 if (i == -1) {
2930 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2931 } else {
2932 if (allow_append) {
2933 // append path to existing module entry
2934 _patch_mod_prefix->at(i)->append_path(path);
2935 } else {
2936 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2937 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2938 } else {
2939 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2940 }
2941 }
2942 }
2943 }
2944
2945 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2946 //
2947 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2948 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2949 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2950 // path is treated as the current directory.
2951 //
2952 // This causes problems with CDS, which requires that all directories specified in the classpath
2953 // must be empty. In most cases, applications do NOT want to load classes from the current
2954 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2955 // scripts compatible with CDS.
2956 void Arguments::fix_appclasspath() {
2957 if (IgnoreEmptyClassPaths) {
2958 const char separator = *os::path_separator();
2959 const char* src = _java_class_path->value();
2960
2961 // skip over all the leading empty paths
2962 while (*src == separator) {
2963 src ++;
2964 }
2965
2966 char* copy = os::strdup_check_oom(src, mtArguments);
2967
2968 // trim all trailing empty paths
2969 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2970 *tail = '\0';
2971 }
2972
2973 char from[3] = {separator, separator, '\0'};
2974 char to [2] = {separator, '\0'};
2975 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2976 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2977 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2978 }
2979
2980 _java_class_path->set_writeable_value(copy);
2981 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2982 }
2983 }
2984
2985 jint Arguments::finalize_vm_init_args() {
2986 // check if the default lib/endorsed directory exists; if so, error
2987 char path[JVM_MAXPATHLEN];
2988 const char* fileSep = os::file_separator();
2989 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2990
2991 DIR* dir = os::opendir(path);
2992 if (dir != nullptr) {
2993 jio_fprintf(defaultStream::output_stream(),
2994 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2995 "in modular form will be supported via the concept of upgradeable modules.\n");
2996 os::closedir(dir);
2997 return JNI_ERR;
2998 }
2999
3000 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3001 dir = os::opendir(path);
3002 if (dir != nullptr) {
3003 jio_fprintf(defaultStream::output_stream(),
3004 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3005 "Use -classpath instead.\n.");
3006 os::closedir(dir);
3007 return JNI_ERR;
3008 }
3009
3010 // This must be done after all arguments have been processed
3011 // and the container support has been initialized since AggressiveHeap
3012 // relies on the amount of total memory available.
3013 if (AggressiveHeap) {
3014 jint result = set_aggressive_heap_flags();
3015 if (result != JNI_OK) {
3016 return result;
3017 }
3018 }
3019
3020 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3021 // but like -Xint, leave compilation thresholds unaffected.
3022 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3023 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3024 set_mode_flags(_int);
3025 }
3026
3027 #ifdef ZERO
3028 // Zero always runs in interpreted mode
3029 set_mode_flags(_int);
3030 #endif
3031
3032 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3033 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3034 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3035 }
3036
3037 #if !COMPILER2_OR_JVMCI
3038 // Don't degrade server performance for footprint
3039 if (FLAG_IS_DEFAULT(UseLargePages) &&
3040 MaxHeapSize < LargePageHeapSizeThreshold) {
3041 // No need for large granularity pages w/small heaps.
3042 // Note that large pages are enabled/disabled for both the
3043 // Java heap and the code cache.
3044 FLAG_SET_DEFAULT(UseLargePages, false);
3045 }
3046
3047 UNSUPPORTED_OPTION(ProfileInterpreter);
3048 #endif
3049
3050 // Parse the CompilationMode flag
3051 if (!CompilationModeFlag::initialize()) {
3052 return JNI_ERR;
3053 }
3054
3055 if (!check_vm_args_consistency()) {
3056 return JNI_ERR;
3057 }
3058
3059 // finalize --module-patch and related --enable-preview
3060 if (finalize_patch_module() != JNI_OK) {
3061 return JNI_ERR;
3062 }
3063
3064 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
3065 return JNI_ERR;
3066 }
3067
3068 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3069 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3070 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3071
3072 return JNI_OK;
3073 }
3074
3075 // Helper class for controlling the lifetime of JavaVMInitArgs
3076 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3077 // deleted on the destruction of the ScopedVMInitArgs object.
3078 class ScopedVMInitArgs : public StackObj {
3079 private:
3080 JavaVMInitArgs _args;
3081 char* _container_name;
3082 bool _is_set;
3083 char* _vm_options_file_arg;
3084
3085 public:
3086 ScopedVMInitArgs(const char *container_name) {
3087 _args.version = JNI_VERSION_1_2;
3088 _args.nOptions = 0;
3089 _args.options = nullptr;
3090 _args.ignoreUnrecognized = false;
3091 _container_name = (char *)container_name;
3092 _is_set = false;
3093 _vm_options_file_arg = nullptr;
3094 }
3095
3096 // Populates the JavaVMInitArgs object represented by this
3097 // ScopedVMInitArgs object with the arguments in options. The
3098 // allocated memory is deleted by the destructor. If this method
3099 // returns anything other than JNI_OK, then this object is in a
3100 // partially constructed state, and should be abandoned.
3101 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3102 _is_set = true;
3103 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3104 JavaVMOption, options->length(), mtArguments);
3105 if (options_arr == nullptr) {
3106 return JNI_ENOMEM;
3107 }
3108 _args.options = options_arr;
3109
3110 for (int i = 0; i < options->length(); i++) {
3111 options_arr[i] = options->at(i);
3112 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3113 if (options_arr[i].optionString == nullptr) {
3114 // Rely on the destructor to do cleanup.
3115 _args.nOptions = i;
3116 return JNI_ENOMEM;
3117 }
3118 }
3119
3120 _args.nOptions = options->length();
3121 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3122 return JNI_OK;
3123 }
3124
3125 JavaVMInitArgs* get() { return &_args; }
3126 char* container_name() { return _container_name; }
3127 bool is_set() { return _is_set; }
3128 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3129 char* vm_options_file_arg() { return _vm_options_file_arg; }
3130
3131 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3132 if (_vm_options_file_arg != nullptr) {
3133 os::free(_vm_options_file_arg);
3134 }
3135 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3136 }
3137
3138 ~ScopedVMInitArgs() {
3139 if (_vm_options_file_arg != nullptr) {
3140 os::free(_vm_options_file_arg);
3141 }
3142 if (_args.options == nullptr) return;
3143 for (int i = 0; i < _args.nOptions; i++) {
3144 os::free(_args.options[i].optionString);
3145 }
3146 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3147 }
3148
3149 // Insert options into this option list, to replace option at
3150 // vm_options_file_pos (-XX:VMOptionsFile)
3151 jint insert(const JavaVMInitArgs* args,
3152 const JavaVMInitArgs* args_to_insert,
3153 const int vm_options_file_pos) {
3154 assert(_args.options == nullptr, "shouldn't be set yet");
3155 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3156 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3157
3158 int length = args->nOptions + args_to_insert->nOptions - 1;
3159 // Construct new option array
3160 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3161 for (int i = 0; i < args->nOptions; i++) {
3162 if (i == vm_options_file_pos) {
3163 // insert the new options starting at the same place as the
3164 // -XX:VMOptionsFile option
3165 for (int j = 0; j < args_to_insert->nOptions; j++) {
3166 options.push(args_to_insert->options[j]);
3167 }
3168 } else {
3169 options.push(args->options[i]);
3170 }
3171 }
3172 // make into options array
3173 return set_args(&options);
3174 }
3175 };
3176
3177 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3178 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3179 }
3180
3181 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3182 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3183 }
3184
3185 jint Arguments::parse_options_environment_variable(const char* name,
3186 ScopedVMInitArgs* vm_args) {
3187 char *buffer = ::getenv(name);
3188
3189 // Don't check this environment variable if user has special privileges
3190 // (e.g. unix su command).
3191 if (buffer == nullptr || os::have_special_privileges()) {
3192 return JNI_OK;
3193 }
3194
3195 if ((buffer = os::strdup(buffer)) == nullptr) {
3196 return JNI_ENOMEM;
3197 }
3198
3199 jio_fprintf(defaultStream::error_stream(),
3200 "Picked up %s: %s\n", name, buffer);
3201
3202 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3203
3204 os::free(buffer);
3205 return retcode;
3206 }
3207
3208 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3209 // read file into buffer
3210 int fd = ::open(file_name, O_RDONLY);
3211 if (fd < 0) {
3212 jio_fprintf(defaultStream::error_stream(),
3213 "Could not open options file '%s'\n",
3214 file_name);
3215 return JNI_ERR;
3216 }
3217
3218 struct stat stbuf;
3219 int retcode = os::stat(file_name, &stbuf);
3220 if (retcode != 0) {
3221 jio_fprintf(defaultStream::error_stream(),
3222 "Could not stat options file '%s'\n",
3223 file_name);
3224 ::close(fd);
3225 return JNI_ERR;
3226 }
3227
3228 if (stbuf.st_size == 0) {
3229 // tell caller there is no option data and that is ok
3230 ::close(fd);
3231 return JNI_OK;
3232 }
3233
3234 // '+ 1' for null termination even with max bytes
3235 size_t bytes_alloc = stbuf.st_size + 1;
3236
3237 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3238 if (nullptr == buf) {
3239 jio_fprintf(defaultStream::error_stream(),
3240 "Could not allocate read buffer for options file parse\n");
3241 ::close(fd);
3242 return JNI_ENOMEM;
3243 }
3244
3245 memset(buf, 0, bytes_alloc);
3246
3247 // Fill buffer
3248 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3249 ::close(fd);
3250 if (bytes_read < 0) {
3251 FREE_C_HEAP_ARRAY(char, buf);
3252 jio_fprintf(defaultStream::error_stream(),
3253 "Could not read options file '%s'\n", file_name);
3254 return JNI_ERR;
3255 }
3256
3257 if (bytes_read == 0) {
3258 // tell caller there is no option data and that is ok
3259 FREE_C_HEAP_ARRAY(char, buf);
3260 return JNI_OK;
3261 }
3262
3263 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3264
3265 FREE_C_HEAP_ARRAY(char, buf);
3266 return retcode;
3267 }
3268
3269 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3270 // Construct option array
3271 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3272
3273 // some pointers to help with parsing
3274 char *buffer_end = buffer + buf_len;
3275 char *opt_hd = buffer;
3276 char *wrt = buffer;
3277 char *rd = buffer;
3278
3279 // parse all options
3280 while (rd < buffer_end) {
3281 // skip leading white space from the input string
3282 while (rd < buffer_end && isspace(*rd)) {
3283 rd++;
3284 }
3285
3286 if (rd >= buffer_end) {
3287 break;
3288 }
3289
3290 // Remember this is where we found the head of the token.
3291 opt_hd = wrt;
3292
3293 // Tokens are strings of non white space characters separated
3294 // by one or more white spaces.
3295 while (rd < buffer_end && !isspace(*rd)) {
3296 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3297 int quote = *rd; // matching quote to look for
3298 rd++; // don't copy open quote
3299 while (rd < buffer_end && *rd != quote) {
3300 // include everything (even spaces)
3301 // up until the close quote
3302 *wrt++ = *rd++; // copy to option string
3303 }
3304
3305 if (rd < buffer_end) {
3306 rd++; // don't copy close quote
3307 } else {
3308 // did not see closing quote
3309 jio_fprintf(defaultStream::error_stream(),
3310 "Unmatched quote in %s\n", name);
3311 return JNI_ERR;
3312 }
3313 } else {
3314 *wrt++ = *rd++; // copy to option string
3315 }
3316 }
3317
3318 // steal a white space character and set it to null
3319 *wrt++ = '\0';
3320 // We now have a complete token
3321
3322 JavaVMOption option;
3323 option.optionString = opt_hd;
3324 option.extraInfo = nullptr;
3325
3326 options.append(option); // Fill in option
3327
3328 rd++; // Advance to next character
3329 }
3330
3331 // Fill out JavaVMInitArgs structure.
3332 return vm_args->set_args(&options);
3333 }
3334
3335 #ifndef PRODUCT
3336 // Determine whether LogVMOutput should be implicitly turned on.
3337 static bool use_vm_log() {
3338 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3339 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3340 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3341 PrintAssembly || TraceDeoptimization ||
3342 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3343 return true;
3344 }
3345
3346 #ifdef COMPILER1
3347 if (PrintC1Statistics) {
3348 return true;
3349 }
3350 #endif // COMPILER1
3351
3352 #ifdef COMPILER2
3353 if (PrintOptoAssembly || PrintOptoStatistics) {
3354 return true;
3355 }
3356 #endif // COMPILER2
3357
3358 return false;
3359 }
3360
3361 #endif // PRODUCT
3362
3363 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3364 for (int index = 0; index < args->nOptions; index++) {
3365 const JavaVMOption* option = args->options + index;
3366 const char* tail;
3367 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3368 return true;
3369 }
3370 }
3371 return false;
3372 }
3373
3374 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3375 const char* vm_options_file,
3376 const int vm_options_file_pos,
3377 ScopedVMInitArgs* vm_options_file_args,
3378 ScopedVMInitArgs* args_out) {
3379 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3380 if (code != JNI_OK) {
3381 return code;
3382 }
3383
3384 if (vm_options_file_args->get()->nOptions < 1) {
3385 return JNI_OK;
3386 }
3387
3388 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3389 jio_fprintf(defaultStream::error_stream(),
3390 "A VM options file may not refer to a VM options file. "
3391 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3392 "options file '%s' in options container '%s' is an error.\n",
3393 vm_options_file_args->vm_options_file_arg(),
3394 vm_options_file_args->container_name());
3395 return JNI_EINVAL;
3396 }
3397
3398 return args_out->insert(args, vm_options_file_args->get(),
3399 vm_options_file_pos);
3400 }
3401
3402 // Expand -XX:VMOptionsFile found in args_in as needed.
3403 // mod_args and args_out parameters may return values as needed.
3404 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3405 ScopedVMInitArgs* mod_args,
3406 JavaVMInitArgs** args_out) {
3407 jint code = match_special_option_and_act(args_in, mod_args);
3408 if (code != JNI_OK) {
3409 return code;
3410 }
3411
3412 if (mod_args->is_set()) {
3413 // args_in contains -XX:VMOptionsFile and mod_args contains the
3414 // original options from args_in along with the options expanded
3415 // from the VMOptionsFile. Return a short-hand to the caller.
3416 *args_out = mod_args->get();
3417 } else {
3418 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3419 }
3420 return JNI_OK;
3421 }
3422
3423 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3424 ScopedVMInitArgs* args_out) {
3425 // Remaining part of option string
3426 const char* tail;
3427 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3428
3429 for (int index = 0; index < args->nOptions; index++) {
3430 const JavaVMOption* option = args->options + index;
3431 if (match_option(option, "-XX:Flags=", &tail)) {
3432 Arguments::set_jvm_flags_file(tail);
3433 continue;
3434 }
3435 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3436 if (vm_options_file_args.found_vm_options_file_arg()) {
3437 jio_fprintf(defaultStream::error_stream(),
3438 "The option '%s' is already specified in the options "
3439 "container '%s' so the specification of '%s' in the "
3440 "same options container is an error.\n",
3441 vm_options_file_args.vm_options_file_arg(),
3442 vm_options_file_args.container_name(),
3443 option->optionString);
3444 return JNI_EINVAL;
3445 }
3446 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3447 // If there's a VMOptionsFile, parse that
3448 jint code = insert_vm_options_file(args, tail, index,
3449 &vm_options_file_args, args_out);
3450 if (code != JNI_OK) {
3451 return code;
3452 }
3453 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3454 if (args_out->is_set()) {
3455 // The VMOptions file inserted some options so switch 'args'
3456 // to the new set of options, and continue processing which
3457 // preserves "last option wins" semantics.
3458 args = args_out->get();
3459 // The first option from the VMOptionsFile replaces the
3460 // current option. So we back track to process the
3461 // replacement option.
3462 index--;
3463 }
3464 continue;
3465 }
3466 if (match_option(option, "-XX:+PrintVMOptions")) {
3467 PrintVMOptions = true;
3468 continue;
3469 }
3470 if (match_option(option, "-XX:-PrintVMOptions")) {
3471 PrintVMOptions = false;
3472 continue;
3473 }
3474 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3475 IgnoreUnrecognizedVMOptions = true;
3476 continue;
3477 }
3478 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3479 IgnoreUnrecognizedVMOptions = false;
3480 continue;
3481 }
3482 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3483 JVMFlag::printFlags(tty, false);
3484 vm_exit(0);
3485 }
3486
3487 #ifndef PRODUCT
3488 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3489 JVMFlag::printFlags(tty, true);
3490 vm_exit(0);
3491 }
3492 #endif
3493 }
3494 return JNI_OK;
3495 }
3496
3497 static void print_options(const JavaVMInitArgs *args) {
3498 const char* tail;
3499 for (int index = 0; index < args->nOptions; index++) {
3500 const JavaVMOption *option = args->options + index;
3501 if (match_option(option, "-XX:", &tail)) {
3502 logOption(tail);
3503 }
3504 }
3505 }
3506
3507 bool Arguments::handle_deprecated_print_gc_flags() {
3508 if (PrintGC) {
3509 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3510 }
3511 if (PrintGCDetails) {
3512 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3513 }
3514
3515 if (_legacyGCLogging.lastFlag == 2) {
3516 // -Xloggc was used to specify a filename
3517 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3518
3519 LogTarget(Error, logging) target;
3520 LogStream errstream(target);
3521 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3522 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3523 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3524 }
3525 return true;
3526 }
3527
3528 static void apply_debugger_ergo() {
3529 #ifndef PRODUCT
3530 // UseDebuggerErgo is notproduct
3531 if (ReplayCompiles) {
3532 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3533 }
3534 #endif
3535
3536 #ifndef PRODUCT
3537 if (UseDebuggerErgo) {
3538 // Turn on sub-flags
3539 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3540 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3541 }
3542 #endif
3543
3544 if (UseDebuggerErgo2) {
3545 // Debugging with limited number of CPUs
3546 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3547 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3548 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3549 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3550 }
3551 }
3552
3553 // Parse entry point called from JNI_CreateJavaVM
3554
3555 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3556 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3557 JVMFlag::check_all_flag_declarations();
3558
3559 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3560 const char* hotspotrc = ".hotspotrc";
3561 bool settings_file_specified = false;
3562 bool needs_hotspotrc_warning = false;
3563 ScopedVMInitArgs initial_vm_options_args("");
3564 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3565 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3566
3567 // Pointers to current working set of containers
3568 JavaVMInitArgs* cur_cmd_args;
3569 JavaVMInitArgs* cur_vm_options_args;
3570 JavaVMInitArgs* cur_java_options_args;
3571 JavaVMInitArgs* cur_java_tool_options_args;
3572
3573 // Containers for modified/expanded options
3574 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3575 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3576 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3577 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3578
3579
3580 jint code =
3581 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3582 if (code != JNI_OK) {
3583 return code;
3584 }
3585
3586 code = parse_java_options_environment_variable(&initial_java_options_args);
3587 if (code != JNI_OK) {
3588 return code;
3589 }
3590
3591 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3592 char *vmoptions = ClassLoader::lookup_vm_options();
3593 if (vmoptions != nullptr) {
3594 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3595 FREE_C_HEAP_ARRAY(char, vmoptions);
3596 if (code != JNI_OK) {
3597 return code;
3598 }
3599 }
3600
3601 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3602 &mod_java_tool_options_args,
3603 &cur_java_tool_options_args);
3604 if (code != JNI_OK) {
3605 return code;
3606 }
3607
3608 code = expand_vm_options_as_needed(initial_cmd_args,
3609 &mod_cmd_args,
3610 &cur_cmd_args);
3611 if (code != JNI_OK) {
3612 return code;
3613 }
3614
3615 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3616 &mod_java_options_args,
3617 &cur_java_options_args);
3618 if (code != JNI_OK) {
3619 return code;
3620 }
3621
3622 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3623 &mod_vm_options_args,
3624 &cur_vm_options_args);
3625 if (code != JNI_OK) {
3626 return code;
3627 }
3628
3629 const char* flags_file = Arguments::get_jvm_flags_file();
3630 settings_file_specified = (flags_file != nullptr);
3631
3632 if (IgnoreUnrecognizedVMOptions) {
3633 cur_cmd_args->ignoreUnrecognized = true;
3634 cur_java_tool_options_args->ignoreUnrecognized = true;
3635 cur_java_options_args->ignoreUnrecognized = true;
3636 }
3637
3638 // Parse specified settings file
3639 if (settings_file_specified) {
3640 if (!process_settings_file(flags_file, true,
3641 cur_cmd_args->ignoreUnrecognized)) {
3642 return JNI_EINVAL;
3643 }
3644 } else {
3645 #ifdef ASSERT
3646 // Parse default .hotspotrc settings file
3647 if (!process_settings_file(".hotspotrc", false,
3648 cur_cmd_args->ignoreUnrecognized)) {
3649 return JNI_EINVAL;
3650 }
3651 #else
3652 struct stat buf;
3653 if (os::stat(hotspotrc, &buf) == 0) {
3654 needs_hotspotrc_warning = true;
3655 }
3656 #endif
3657 }
3658
3659 if (PrintVMOptions) {
3660 print_options(cur_java_tool_options_args);
3661 print_options(cur_cmd_args);
3662 print_options(cur_java_options_args);
3663 }
3664
3665 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3666 jint result = parse_vm_init_args(cur_vm_options_args,
3667 cur_java_tool_options_args,
3668 cur_java_options_args,
3669 cur_cmd_args);
3670
3671 if (result != JNI_OK) {
3672 return result;
3673 }
3674
3675 // Delay warning until here so that we've had a chance to process
3676 // the -XX:-PrintWarnings flag
3677 if (needs_hotspotrc_warning) {
3678 warning("%s file is present but has been ignored. "
3679 "Run with -XX:Flags=%s to load the file.",
3680 hotspotrc, hotspotrc);
3681 }
3682
3683 if (needs_module_property_warning) {
3684 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3685 " names that are reserved for internal use.");
3686 }
3687
3688 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3689 UNSUPPORTED_OPTION(UseLargePages);
3690 #endif
3691
3692 #if defined(AIX)
3693 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3694 #endif
3695
3696 #ifndef PRODUCT
3697 if (TraceBytecodesAt != 0) {
3698 TraceBytecodes = true;
3699 }
3700 #endif // PRODUCT
3701
3702 if (ScavengeRootsInCode == 0) {
3703 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3704 warning("Forcing ScavengeRootsInCode non-zero");
3705 }
3706 ScavengeRootsInCode = 1;
3707 }
3708
3709 if (!handle_deprecated_print_gc_flags()) {
3710 return JNI_EINVAL;
3711 }
3712
3713 // Set object alignment values.
3714 set_object_alignment();
3715
3716 #if !INCLUDE_CDS
3717 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3718 jio_fprintf(defaultStream::error_stream(),
3719 "Shared spaces are not supported in this VM\n");
3720 return JNI_ERR;
3721 }
3722 if (DumpLoadedClassList != nullptr) {
3723 jio_fprintf(defaultStream::error_stream(),
3724 "DumpLoadedClassList is not supported in this VM\n");
3725 return JNI_ERR;
3726 }
3727 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
3728 log_is_enabled(Info, cds)) {
3729 warning("Shared spaces are not supported in this VM");
3730 UseSharedSpaces = false;
3731 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3732 }
3733 no_shared_spaces("CDS Disabled");
3734 #endif // INCLUDE_CDS
3735
3736 // Verify NMT arguments
3737 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3738 if (lvl == NMT_unknown) {
3739 jio_fprintf(defaultStream::error_stream(),
3740 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3741 return JNI_ERR;
3742 }
3743 if (PrintNMTStatistics && lvl == NMT_off) {
3744 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3745 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3746 }
3747
3748 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3749 if (trace_dependencies && VerifyDependencies) {
3750 warning("dependency logging results may be inflated by VerifyDependencies");
3751 }
3752
3753 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3754 log_is_enabled(Info, class, load, cause);
3755 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3756 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3757 }
3758
3759 apply_debugger_ergo();
3760
3761 if (log_is_enabled(Info, arguments)) {
3762 LogStream st(Log(arguments)::info());
3763 Arguments::print_on(&st);
3764 }
3765
3766 return JNI_OK;
3767 }
3768
3769 jint Arguments::apply_ergo() {
3770 // Set flags based on ergonomics.
3771 jint result = set_ergonomics_flags();
3772 if (result != JNI_OK) return result;
3773
3774 // Set heap size based on available physical memory
3775 set_heap_size();
3776
3777 GCConfig::arguments()->initialize();
3778
3779 CDSConfig::initialize();
3780
3781 // Initialize Metaspace flags and alignments
3782 Metaspace::ergo_initialize();
3783
3784 if (!StringDedup::ergo_initialize()) {
3785 return JNI_EINVAL;
3786 }
3787
3788 // Set compiler flags after GC is selected and GC specific
3789 // flags (LoopStripMiningIter) are set.
3790 CompilerConfig::ergo_initialize();
3791
3792 // Set bytecode rewriting flags
3793 set_bytecode_flags();
3794
3795 // Set flags if aggressive optimization flags are enabled
3796 jint code = set_aggressive_opts_flags();
3797 if (code != JNI_OK) {
3798 return code;
3799 }
3800
3801 #ifdef ZERO
3802 // Clear flags not supported on zero.
3803 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3804 #endif // ZERO
3805
3806 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3807 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3808 DebugNonSafepoints = true;
3809 }
3810
3811 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3812 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3813 }
3814
3815 // Treat the odd case where local verification is enabled but remote
3816 // verification is not as if both were enabled.
3817 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3818 log_info(verification)("Turning on remote verification because local verification is on");
3819 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3820 }
3821 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3822 // Disable calling convention optimizations if inline types are not supported.
3823 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3824 // the CDS archive, as the values must match between dumptime and runtime.
3825 InlineTypePassFieldsAsArgs = false;
3826 InlineTypeReturnedAsFields = false;
3827 }
3828
3829 #ifndef PRODUCT
3830 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3831 if (use_vm_log()) {
3832 LogVMOutput = true;
3833 }
3834 }
3835 #endif // PRODUCT
3836
3837 if (PrintCommandLineFlags) {
3838 JVMFlag::printSetFlags(tty);
3839 }
3840
3841 #if COMPILER2_OR_JVMCI
3842 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3843 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3844 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3845 }
3846 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3847
3848 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3849 if (!EnableVectorReboxing) {
3850 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3851 } else {
3852 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3853 }
3854 }
3855 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3856
3857 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3858 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3859 }
3860 FLAG_SET_DEFAULT(UseVectorStubs, false);
3861 }
3862 #endif // COMPILER2_OR_JVMCI
3863
3864 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3865 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3866 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3867 }
3868 }
3869 return JNI_OK;
3870 }
3871
3872 jint Arguments::adjust_after_os() {
3873 if (UseNUMA) {
3874 if (UseParallelGC) {
3875 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3876 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3877 }
3878 }
3879 }
3880 return JNI_OK;
3881 }
3882
3883 int Arguments::PropertyList_count(SystemProperty* pl) {
3884 int count = 0;
3885 while(pl != nullptr) {
3886 count++;
3887 pl = pl->next();
3888 }
3889 return count;
3890 }
3891
3892 // Return the number of readable properties.
3893 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3894 int count = 0;
3895 while(pl != nullptr) {
3896 if (pl->readable()) {
3897 count++;
3898 }
3899 pl = pl->next();
3900 }
3901 return count;
3902 }
3903
3904 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3905 assert(key != nullptr, "just checking");
3906 SystemProperty* prop;
3907 for (prop = pl; prop != nullptr; prop = prop->next()) {
3908 if (strcmp(key, prop->key()) == 0) return prop->value();
3909 }
3910 return nullptr;
3911 }
3912
3913 // Return the value of the requested property provided that it is a readable property.
3914 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3915 assert(key != nullptr, "just checking");
3916 SystemProperty* prop;
3917 // Return the property value if the keys match and the property is not internal or
3918 // it's the special internal property "jdk.boot.class.path.append".
3919 for (prop = pl; prop != nullptr; prop = prop->next()) {
3920 if (strcmp(key, prop->key()) == 0) {
3921 if (!prop->internal()) {
3922 return prop->value();
3923 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3924 return prop->value();
3925 } else {
3926 // Property is internal and not jdk.boot.class.path.append so return null.
3927 return nullptr;
3928 }
3929 }
3930 }
3931 return nullptr;
3932 }
3933
3934 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3935 SystemProperty* p = *plist;
3936 if (p == nullptr) {
3937 *plist = new_p;
3938 } else {
3939 while (p->next() != nullptr) {
3940 p = p->next();
3941 }
3942 p->set_next(new_p);
3943 }
3944 }
3945
3946 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3947 bool writeable, bool internal) {
3948 if (plist == nullptr)
3949 return;
3950
3951 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3952 PropertyList_add(plist, new_p);
3953 }
3954
3955 void Arguments::PropertyList_add(SystemProperty *element) {
3956 PropertyList_add(&_system_properties, element);
3957 }
3958
3959 // This add maintains unique property key in the list.
3960 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3961 PropertyAppendable append, PropertyWriteable writeable,
3962 PropertyInternal internal) {
3963 if (plist == nullptr)
3964 return;
3965
3966 // If property key exists and is writeable, then update with new value.
3967 // Trying to update a non-writeable property is silently ignored.
3968 SystemProperty* prop;
3969 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3970 if (strcmp(k, prop->key()) == 0) {
3971 if (append == AppendProperty) {
3972 prop->append_writeable_value(v);
3973 } else {
3974 prop->set_writeable_value(v);
3975 }
3976 return;
3977 }
3978 }
3979
3980 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3981 }
3982
3983 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3984 // Returns true if all of the source pointed by src has been copied over to
3985 // the destination buffer pointed by buf. Otherwise, returns false.
3986 // Notes:
3987 // 1. If the length (buflen) of the destination buffer excluding the
3988 // null terminator character is not long enough for holding the expanded
3989 // pid characters, it also returns false instead of returning the partially
3990 // expanded one.
3991 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3992 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3993 char* buf, size_t buflen) {
3994 const char* p = src;
3995 char* b = buf;
3996 const char* src_end = &src[srclen];
3997 char* buf_end = &buf[buflen - 1];
3998
3999 while (p < src_end && b < buf_end) {
4000 if (*p == '%') {
4001 switch (*(++p)) {
4002 case '%': // "%%" ==> "%"
4003 *b++ = *p++;
4004 break;
4005 case 'p': { // "%p" ==> current process id
4006 // buf_end points to the character before the last character so
4007 // that we could write '\0' to the end of the buffer.
4008 size_t buf_sz = buf_end - b + 1;
4009 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4010
4011 // if jio_snprintf fails or the buffer is not long enough to hold
4012 // the expanded pid, returns false.
4013 if (ret < 0 || ret >= (int)buf_sz) {
4014 return false;
4015 } else {
4016 b += ret;
4017 assert(*b == '\0', "fail in copy_expand_pid");
4018 if (p == src_end && b == buf_end + 1) {
4019 // reach the end of the buffer.
4020 return true;
4021 }
4022 }
4023 p++;
4024 break;
4025 }
4026 default :
4027 *b++ = '%';
4028 }
4029 } else {
4030 *b++ = *p++;
4031 }
4032 }
4033 *b = '\0';
4034 return (p == src_end); // return false if not all of the source was copied
4035 }