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/genArguments.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
78 #include <string.h>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 char* Arguments::_java_command = nullptr;
90 SystemProperty* Arguments::_system_properties = nullptr;
91 size_t Arguments::_conservative_max_heap_alignment = 0;
92 Arguments::Mode Arguments::_mode = _mixed;
93 const char* Arguments::_java_vendor_url_bug = nullptr;
94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
95 bool Arguments::_sun_java_launcher_is_altjvm = false;
96
97 // These parameters are reset in method parse_vm_init_args()
98 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
99 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
100 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
101 bool Arguments::_ClipInlining = ClipInlining;
102 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
103
104 bool Arguments::_enable_preview = false;
105
106 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
107
108 // These are not set by the JDK's built-in launchers, but they can be set by
109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
110 // JavaVMOption in jni.h.
111 abort_hook_t Arguments::_abort_hook = nullptr;
112 exit_hook_t Arguments::_exit_hook = nullptr;
113 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
114
115
116 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
117 SystemProperty *Arguments::_java_library_path = nullptr;
118 SystemProperty *Arguments::_java_home = nullptr;
119 SystemProperty *Arguments::_java_class_path = nullptr;
120 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
121 SystemProperty *Arguments::_vm_info = nullptr;
122
123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
124 PathString *Arguments::_boot_class_path = nullptr;
125 bool Arguments::_has_jimage = false;
126
127 char* Arguments::_ext_dirs = nullptr;
128
129 // True if -Xshare:auto option was specified.
130 static bool xshare_auto_cmd_line = false;
131
132 // True if -Xint/-Xmixed/-Xcomp were specified
133 static bool mode_flag_cmd_line = false;
134
135 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
136 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
137 if (new_value == nullptr) {
138 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
139 return false;
140 }
141 if (_value != nullptr) {
142 FreeHeap(_value);
143 }
144 _value = new_value;
145 strcpy(_value, value);
146 return true;
147 }
148
149 void PathString::append_value(const char *value) {
150 char *sp;
151 size_t len = 0;
152 if (value != nullptr) {
153 len = strlen(value);
154 if (_value != nullptr) {
155 len += strlen(_value);
156 }
157 sp = AllocateHeap(len+2, mtArguments);
158 assert(sp != nullptr, "Unable to allocate space for new append path value");
159 if (sp != nullptr) {
160 if (_value != nullptr) {
161 strcpy(sp, _value);
162 strcat(sp, os::path_separator());
163 strcat(sp, value);
164 FreeHeap(_value);
165 } else {
166 strcpy(sp, value);
167 }
168 _value = sp;
169 }
170 }
171 }
172
173 PathString::PathString(const char* value) {
174 if (value == nullptr) {
175 _value = nullptr;
176 } else {
177 _value = AllocateHeap(strlen(value)+1, mtArguments);
178 strcpy(_value, value);
179 }
180 }
181
182 PathString::~PathString() {
183 if (_value != nullptr) {
184 FreeHeap(_value);
185 _value = nullptr;
186 }
187 }
188
189 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
190 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
191 size_t len = strlen(module_name) + 1;
192 _module_name = AllocateHeap(len, mtInternal);
193 strncpy(_module_name, module_name, len); // copy the trailing null
194 _path = new PathString(path);
195 }
196
197 ModulePatchPath::~ModulePatchPath() {
198 if (_module_name != nullptr) {
199 FreeHeap(_module_name);
200 _module_name = nullptr;
201 }
202 if (_path != nullptr) {
203 delete _path;
204 _path = nullptr;
205 }
206 }
207
208 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
209 if (key == nullptr) {
210 _key = nullptr;
211 } else {
212 _key = AllocateHeap(strlen(key)+1, mtArguments);
213 strcpy(_key, key);
214 }
215 _next = nullptr;
216 _internal = internal;
217 _writeable = writeable;
218 }
219
220 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
221 // part of the option string.
222 static bool match_option(const JavaVMOption *option, const char* name,
223 const char** tail) {
224 size_t len = strlen(name);
225 if (strncmp(option->optionString, name, len) == 0) {
226 *tail = option->optionString + len;
227 return true;
228 } else {
229 return false;
230 }
231 }
232
233 // Check if 'option' matches 'name'. No "tail" is allowed.
234 static bool match_option(const JavaVMOption *option, const char* name) {
235 const char* tail = nullptr;
236 bool result = match_option(option, name, &tail);
237 if (tail != nullptr && *tail == '\0') {
238 return result;
239 } else {
240 return false;
241 }
242 }
243
244 // Return true if any of the strings in null-terminated array 'names' matches.
245 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
246 // the option must match exactly.
247 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
248 bool tail_allowed) {
249 for (/* empty */; *names != nullptr; ++names) {
250 if (match_option(option, *names, tail)) {
251 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
252 return true;
253 }
254 }
255 }
256 return false;
257 }
258
259 #if INCLUDE_JFR
260 static bool _has_jfr_option = false; // is using JFR
261
262 // return true on failure
263 static bool match_jfr_option(const JavaVMOption** option) {
264 assert((*option)->optionString != nullptr, "invariant");
265 char* tail = nullptr;
266 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
267 _has_jfr_option = true;
268 return Jfr::on_start_flight_recording_option(option, tail);
269 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
270 _has_jfr_option = true;
271 return Jfr::on_flight_recorder_option(option, tail);
272 }
273 return false;
274 }
275
276 bool Arguments::has_jfr_option() {
277 return _has_jfr_option;
278 }
279 #endif
280
281 static void logOption(const char* opt) {
282 if (PrintVMOptions) {
283 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
284 }
285 }
286
287 bool needs_module_property_warning = false;
288
289 #define MODULE_PROPERTY_PREFIX "jdk.module."
290 #define MODULE_PROPERTY_PREFIX_LEN 11
291 #define ADDEXPORTS "addexports"
292 #define ADDEXPORTS_LEN 10
293 #define ADDREADS "addreads"
294 #define ADDREADS_LEN 8
295 #define ADDOPENS "addopens"
296 #define ADDOPENS_LEN 8
297 #define PATCH "patch"
298 #define PATCH_LEN 5
299 #define ADDMODS "addmods"
300 #define ADDMODS_LEN 7
301 #define LIMITMODS "limitmods"
302 #define LIMITMODS_LEN 9
303 #define PATH "path"
304 #define PATH_LEN 4
305 #define UPGRADE_PATH "upgrade.path"
306 #define UPGRADE_PATH_LEN 12
307 #define ENABLE_NATIVE_ACCESS "enable.native.access"
308 #define ENABLE_NATIVE_ACCESS_LEN 20
309 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
310 #define ILLEGAL_NATIVE_ACCESS_LEN 21
311
312 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
313 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
314 return ((strncmp(option, property, len) == 0) &&
315 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
316 }
317
318 // Return true if property starts with "jdk.module." and its ensuing chars match
319 // any of the reserved module properties.
320 // property should be passed without the leading "-D".
321 bool Arguments::is_internal_module_property(const char* property) {
322 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
323 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
324 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
325 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
326 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
327 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
328 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
329 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
330 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
331 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
332 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
333 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
334 return true;
335 }
336 }
337 return false;
338 }
339
340 // Process java launcher properties.
341 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
342 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
343 // Must do this before setting up other system properties,
344 // as some of them may depend on launcher type.
345 for (int index = 0; index < args->nOptions; index++) {
346 const JavaVMOption* option = args->options + index;
347 const char* tail;
348
349 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
350 process_java_launcher_argument(tail, option->extraInfo);
351 continue;
352 }
353 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
354 if (strcmp(tail, "true") == 0) {
355 _sun_java_launcher_is_altjvm = true;
356 }
357 continue;
358 }
359 }
360 }
361
362 // Initialize system properties key and value.
363 void Arguments::init_system_properties() {
364
365 // Set up _boot_class_path which is not a property but
366 // relies heavily on argument processing and the jdk.boot.class.path.append
367 // property. It is used to store the underlying boot class path.
368 _boot_class_path = new PathString(nullptr);
369
370 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
371 "Java Virtual Machine Specification", false));
372 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
373 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
374 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
375
376 // Initialize the vm.info now, but it will need updating after argument parsing.
377 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
378
379 // Following are JVMTI agent writable properties.
380 // Properties values are set to nullptr and they are
381 // os specific they are initialized in os::init_system_properties_values().
382 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
383 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
384 _java_home = new SystemProperty("java.home", nullptr, true);
385 _java_class_path = new SystemProperty("java.class.path", "", true);
386 // jdk.boot.class.path.append is a non-writeable, internal property.
387 // It can only be set by either:
388 // - -Xbootclasspath/a:
389 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
390 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
391
392 // Add to System Property list.
393 PropertyList_add(&_system_properties, _sun_boot_library_path);
394 PropertyList_add(&_system_properties, _java_library_path);
395 PropertyList_add(&_system_properties, _java_home);
396 PropertyList_add(&_system_properties, _java_class_path);
397 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
398 PropertyList_add(&_system_properties, _vm_info);
399
400 // Set OS specific system properties values
401 os::init_system_properties_values();
402 }
403
404 // Update/Initialize System properties after JDK version number is known
405 void Arguments::init_version_specific_system_properties() {
406 enum { bufsz = 16 };
407 char buffer[bufsz];
408 const char* spec_vendor = "Oracle Corporation";
409 uint32_t spec_version = JDK_Version::current().major_version();
410
411 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
412
413 PropertyList_add(&_system_properties,
414 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
415 PropertyList_add(&_system_properties,
416 new SystemProperty("java.vm.specification.version", buffer, false));
417 PropertyList_add(&_system_properties,
418 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
419 }
420
421 /*
422 * -XX argument processing:
423 *
424 * -XX arguments are defined in several places, such as:
425 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
426 * -XX arguments are parsed in parse_argument().
427 * -XX argument bounds checking is done in check_vm_args_consistency().
428 *
429 * Over time -XX arguments may change. There are mechanisms to handle common cases:
430 *
431 * ALIASED: An option that is simply another name for another option. This is often
432 * part of the process of deprecating a flag, but not all aliases need
433 * to be deprecated.
434 *
435 * Create an alias for an option by adding the old and new option names to the
436 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
437 *
438 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
439 * support may be removed in the future. Both regular and aliased options may be
440 * deprecated.
441 *
442 * Add a deprecation warning for an option (or alias) by adding an entry in the
443 * "special_jvm_flags" table and setting the "deprecated_in" field.
444 * Often an option "deprecated" in one major release will
445 * be made "obsolete" in the next. In this case the entry should also have its
446 * "obsolete_in" field set.
447 *
448 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
449 * on the command line. A warning is printed to let the user know that option might not
450 * be accepted in the future.
451 *
452 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
453 * table and setting the "obsolete_in" field.
454 *
455 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
456 * to the current JDK version. The system will flatly refuse to admit the existence of
457 * the flag. This allows a flag to die automatically over JDK releases.
458 *
459 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
460 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
461 * - Newly obsolete or expired deprecated options should have their global variable
462 * definitions removed (from globals.hpp, etc) and related implementations removed.
463 *
464 * Recommended approach for removing options:
465 *
466 * To remove options commonly used by customers (e.g. product -XX options), use
467 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
468 *
469 * To remove internal options (e.g. diagnostic, experimental, develop options), use
470 * a 2-step model adding major release numbers to the obsolete and expire columns.
471 *
472 * To change the name of an option, use the alias table as well as a 2-step
473 * model adding major release numbers to the deprecate and expire columns.
474 * Think twice about aliasing commonly used customer options.
475 *
476 * There are times when it is appropriate to leave a future release number as undefined.
477 *
478 * Tests: Aliases should be tested in VMAliasOptions.java.
479 * Deprecated options should be tested in VMDeprecatedOptions.java.
480 */
481
482 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
483 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
484 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
485 // the command-line as usual, but will issue a warning.
486 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
487 // the command-line, while issuing a warning and ignoring the flag value.
488 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
489 // existence of the flag.
490 //
491 // MANUAL CLEANUP ON JDK VERSION UPDATES:
492 // This table ensures that the handling of options will update automatically when the JDK
493 // version is incremented, but the source code needs to be cleanup up manually:
494 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
495 // variable should be removed, as well as users of the variable.
496 // - As "deprecated" options age into "obsolete" options, move the entry into the
497 // "Obsolete Flags" section of the table.
498 // - All expired options should be removed from the table.
499 static SpecialFlag const special_jvm_flags[] = {
500 // -------------- Deprecated Flags --------------
501 // --- Non-alias flags - sorted by obsolete_in then expired_in:
502 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
503 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
504 { "ZGenerational", JDK_Version::jdk(23), 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 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
510 #ifdef LINUX
511 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
512 #endif
513 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
514 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
515 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
516
517 // -------------- Obsolete Flags - sorted by expired_in --------------
518
519 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
520
521 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
522 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
523 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
524 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
525 #if defined(X86)
526 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
527 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
528 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
529 #endif // X86
530
531
532 { "BaseFootPrintEstimate", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
533 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
534 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
535 #ifdef ASSERT
536 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
537 #endif
538
539 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
540 // These entries will generate build errors. Their purpose is to test the macros.
541 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
542 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
543 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
544 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
545 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
546 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
547 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
548 #endif
549
550 { nullptr, JDK_Version(0), JDK_Version(0) }
551 };
552
553 // Flags that are aliases for other flags.
554 typedef struct {
555 const char* alias_name;
556 const char* real_name;
557 } AliasedFlag;
558
559 static AliasedFlag const aliased_jvm_flags[] = {
560 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
561 { nullptr, nullptr}
562 };
563
564 // Return true if "v" is less than "other", where "other" may be "undefined".
565 static bool version_less_than(JDK_Version v, JDK_Version other) {
566 assert(!v.is_undefined(), "must be defined");
567 if (!other.is_undefined() && v.compare(other) >= 0) {
568 return false;
569 } else {
570 return true;
571 }
572 }
573
574 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
575 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
576 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
577 flag = special_jvm_flags[i];
578 return true;
579 }
580 }
581 return false;
582 }
583
584 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
585 assert(version != nullptr, "Must provide a version buffer");
586 SpecialFlag flag;
587 if (lookup_special_flag(flag_name, flag)) {
588 if (!flag.obsolete_in.is_undefined()) {
589 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
590 *version = flag.obsolete_in;
591 // This flag may have been marked for obsoletion in this version, but we may not
592 // have actually removed it yet. Rather than ignoring it as soon as we reach
593 // this version we allow some time for the removal to happen. So if the flag
594 // still actually exists we process it as normal, but issue an adjusted warning.
595 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
596 if (real_flag != nullptr) {
597 char version_str[256];
598 version->to_string(version_str, sizeof(version_str));
599 warning("Temporarily processing option %s; support is scheduled for removal in %s",
600 flag_name, version_str);
601 return false;
602 }
603 return true;
604 }
605 }
606 }
607 return false;
608 }
609
610 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
611 assert(version != nullptr, "Must provide a version buffer");
612 SpecialFlag flag;
613 if (lookup_special_flag(flag_name, flag)) {
614 if (!flag.deprecated_in.is_undefined()) {
615 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
616 version_less_than(JDK_Version::current(), flag.expired_in)) {
617 *version = flag.deprecated_in;
618 return 1;
619 } else {
620 return -1;
621 }
622 }
623 }
624 return 0;
625 }
626
627 const char* Arguments::real_flag_name(const char *flag_name) {
628 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
629 const AliasedFlag& flag_status = aliased_jvm_flags[i];
630 if (strcmp(flag_status.alias_name, flag_name) == 0) {
631 return flag_status.real_name;
632 }
633 }
634 return flag_name;
635 }
636
637 #ifdef ASSERT
638 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
639 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
640 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
641 return true;
642 }
643 }
644 return false;
645 }
646
647 // Verifies the correctness of the entries in the special_jvm_flags table.
648 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
649 // version being earlier than the deprecation version, then a warning is issued
650 // and verification fails - by returning false. If it is detected that the table
651 // is out of date, with respect to the current version, then ideally a warning is
652 // issued but verification does not fail. This allows the VM to operate when the
653 // version is first updated, without needing to update all the impacted flags at
654 // the same time. In practice we can't issue the warning immediately when the version
655 // is updated as it occurs for every test and some tests are not prepared to handle
656 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
657 // if the check_globals flag is true, and in addition allow a grace period and only
658 // check for stale flags when we hit build 25 (which is far enough into the 6 month
659 // release cycle that all flag updates should have been processed, whilst still
660 // leaving time to make the change before RDP2).
661 // We use a gtest to call this, passing true, so that we can detect stale flags before
662 // the end of the release cycle.
663
664 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
665
666 bool Arguments::verify_special_jvm_flags(bool check_globals) {
667 bool success = true;
668 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
669 const SpecialFlag& flag = special_jvm_flags[i];
670 if (lookup_special_flag(flag.name, i)) {
671 warning("Duplicate special flag declaration \"%s\"", flag.name);
672 success = false;
673 }
674 if (flag.deprecated_in.is_undefined() &&
675 flag.obsolete_in.is_undefined()) {
676 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
677 success = false;
678 }
679
680 if (!flag.deprecated_in.is_undefined()) {
681 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
682 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
683 success = false;
684 }
685
686 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
687 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
688 success = false;
689 }
690 }
691
692 if (!flag.obsolete_in.is_undefined()) {
693 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
694 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
695 success = false;
696 }
697
698 // if flag has become obsolete it should not have a "globals" flag defined anymore.
699 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
700 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
701 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
702 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
703 success = false;
704 }
705 }
706
707 } else if (!flag.expired_in.is_undefined()) {
708 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
709 success = false;
710 }
711
712 if (!flag.expired_in.is_undefined()) {
713 // if flag has become expired it should not have a "globals" flag defined anymore.
714 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
715 !version_less_than(JDK_Version::current(), flag.expired_in)) {
716 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
717 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
718 success = false;
719 }
720 }
721 }
722 }
723 return success;
724 }
725 #endif
726
727 bool Arguments::atojulong(const char *s, julong* result) {
728 return parse_integer(s, result);
729 }
730
731 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
732 if (size < min_size) return arg_too_small;
733 if (size > max_size) return arg_too_big;
734 return arg_in_range;
735 }
736
737 // Describe an argument out of range error
738 void Arguments::describe_range_error(ArgsRange errcode) {
739 switch(errcode) {
740 case arg_too_big:
741 jio_fprintf(defaultStream::error_stream(),
742 "The specified size exceeds the maximum "
743 "representable size.\n");
744 break;
745 case arg_too_small:
746 case arg_unreadable:
747 case arg_in_range:
748 // do nothing for now
749 break;
750 default:
751 ShouldNotReachHere();
752 }
753 }
754
755 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
756 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
757 return true;
758 } else {
759 return false;
760 }
761 }
762
763 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
764 // strtod allows leading whitespace, but our flag format does not.
765 if (*value == '\0' || isspace((unsigned char) *value)) {
766 return false;
767 }
768 char* end;
769 errno = 0;
770 double v = strtod(value, &end);
771 if ((errno != 0) || (*end != 0)) {
772 return false;
773 }
774 if (g_isnan(v) || !g_isfinite(v)) {
775 // Currently we cannot handle these special values.
776 return false;
777 }
778
779 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
780 return true;
781 }
782 return false;
783 }
784
785 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
786 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
787
788 if (flag->is_int()) {
789 int v;
790 if (parse_integer(value, &v)) {
791 result = JVMFlagAccess::set_int(flag, &v, origin);
792 }
793 } else if (flag->is_uint()) {
794 uint v;
795 if (parse_integer(value, &v)) {
796 result = JVMFlagAccess::set_uint(flag, &v, origin);
797 }
798 } else if (flag->is_intx()) {
799 intx v;
800 if (parse_integer(value, &v)) {
801 result = JVMFlagAccess::set_intx(flag, &v, origin);
802 }
803 } else if (flag->is_uintx()) {
804 uintx v;
805 if (parse_integer(value, &v)) {
806 result = JVMFlagAccess::set_uintx(flag, &v, origin);
807 }
808 } else if (flag->is_uint64_t()) {
809 uint64_t v;
810 if (parse_integer(value, &v)) {
811 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
812 }
813 } else if (flag->is_size_t()) {
814 size_t v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_size_t(flag, &v, origin);
817 }
818 }
819
820 return result == JVMFlag::SUCCESS;
821 }
822
823 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
824 if (value[0] == '\0') {
825 value = nullptr;
826 }
827 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
828 // Contract: JVMFlag always returns a pointer that needs freeing.
829 FREE_C_HEAP_ARRAY(char, value);
830 return true;
831 }
832
833 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
834 const char* old_value = "";
835 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
836 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
837 size_t new_len = strlen(new_value);
838 const char* value;
839 char* free_this_too = nullptr;
840 if (old_len == 0) {
841 value = new_value;
842 } else if (new_len == 0) {
843 value = old_value;
844 } else {
845 size_t length = old_len + 1 + new_len + 1;
846 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
847 // each new setting adds another LINE to the switch:
848 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
849 value = buf;
850 free_this_too = buf;
851 }
852 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
853 // JVMFlag always returns a pointer that needs freeing.
854 FREE_C_HEAP_ARRAY(char, value);
855 // JVMFlag made its own copy, so I must delete my own temp. buffer.
856 FREE_C_HEAP_ARRAY(char, free_this_too);
857 return true;
858 }
859
860 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
861 const char* real_name = real_flag_name(arg);
862 JDK_Version since = JDK_Version();
863 switch (is_deprecated_flag(arg, &since)) {
864 case -1: {
865 // Obsolete or expired, so don't process normally,
866 // but allow for an obsolete flag we're still
867 // temporarily allowing.
868 if (!is_obsolete_flag(arg, &since)) {
869 return real_name;
870 }
871 // Note if we're not considered obsolete then we can't be expired either
872 // as obsoletion must come first.
873 return nullptr;
874 }
875 case 0:
876 return real_name;
877 case 1: {
878 char version[256];
879 since.to_string(version, sizeof(version));
880 if (real_name != arg) {
881 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
882 arg, version, real_name);
883 } else {
884 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
885 arg, version);
886 }
887 return real_name;
888 }
889 }
890 ShouldNotReachHere();
891 return nullptr;
892 }
893
894 #define BUFLEN 255
895
896 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
897 char name_copied[BUFLEN+1];
898 if (name[name_length] != 0) {
899 if (name_length > BUFLEN) {
900 return nullptr;
901 } else {
902 strncpy(name_copied, name, name_length);
903 name_copied[name_length] = '\0';
904 name = name_copied;
905 }
906 }
907
908 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
909 if (real_name == nullptr) {
910 return nullptr;
911 }
912 JVMFlag* flag = JVMFlag::find_flag(real_name);
913 return flag;
914 }
915
916 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
917 bool is_bool = false;
918 bool bool_val = false;
919 char c = *arg;
920 if (c == '+' || c == '-') {
921 is_bool = true;
922 bool_val = (c == '+');
923 arg++;
924 }
925
926 const char* name = arg;
927 while (true) {
928 c = *arg;
929 if (isalnum(c) || (c == '_')) {
930 ++arg;
931 } else {
932 break;
933 }
934 }
935
936 size_t name_len = size_t(arg - name);
937 if (name_len == 0) {
938 return false;
939 }
940
941 JVMFlag* flag = find_jvm_flag(name, name_len);
942 if (flag == nullptr) {
943 return false;
944 }
945
946 if (is_bool) {
947 if (*arg != 0) {
948 // Error -- extra characters such as -XX:+BoolFlag=123
949 return false;
950 }
951 return set_bool_flag(flag, bool_val, origin);
952 }
953
954 if (arg[0] == '=') {
955 const char* value = arg + 1;
956 if (flag->is_ccstr()) {
957 if (flag->ccstr_accumulates()) {
958 return append_to_string_flag(flag, value, origin);
959 } else {
960 return set_string_flag(flag, value, origin);
961 }
962 } else if (flag->is_double()) {
963 return set_fp_numeric_flag(flag, value, origin);
964 } else {
965 return set_numeric_flag(flag, value, origin);
966 }
967 }
968
969 if (arg[0] == ':' && arg[1] == '=') {
970 // -XX:Foo:=xxx will reset the string flag to the given value.
971 const char* value = arg + 2;
972 return set_string_flag(flag, value, origin);
973 }
974
975 return false;
976 }
977
978 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
979 assert(bldarray != nullptr, "illegal argument");
980
981 if (arg == nullptr) {
982 return;
983 }
984
985 int new_count = *count + 1;
986
987 // expand the array and add arg to the last element
988 if (*bldarray == nullptr) {
989 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
990 } else {
991 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
992 }
993 (*bldarray)[*count] = os::strdup_check_oom(arg);
994 *count = new_count;
995 }
996
997 void Arguments::build_jvm_args(const char* arg) {
998 add_string(&_jvm_args_array, &_num_jvm_args, arg);
999 }
1000
1001 void Arguments::build_jvm_flags(const char* arg) {
1002 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1003 }
1004
1005 // utility function to return a string that concatenates all
1006 // strings in a given char** array
1007 const char* Arguments::build_resource_string(char** args, int count) {
1008 if (args == nullptr || count == 0) {
1009 return nullptr;
1010 }
1011 size_t length = 0;
1012 for (int i = 0; i < count; i++) {
1013 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1014 }
1015 char* s = NEW_RESOURCE_ARRAY(char, length);
1016 char* dst = s;
1017 for (int j = 0; j < count; j++) {
1018 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1019 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1020 dst += offset;
1021 length -= offset;
1022 }
1023 return (const char*) s;
1024 }
1025
1026 void Arguments::print_on(outputStream* st) {
1027 st->print_cr("VM Arguments:");
1028 if (num_jvm_flags() > 0) {
1029 st->print("jvm_flags: "); print_jvm_flags_on(st);
1030 st->cr();
1031 }
1032 if (num_jvm_args() > 0) {
1033 st->print("jvm_args: "); print_jvm_args_on(st);
1034 st->cr();
1035 }
1036 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1037 if (_java_class_path != nullptr) {
1038 char* path = _java_class_path->value();
1039 size_t len = strlen(path);
1040 st->print("java_class_path (initial): ");
1041 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1042 if (len == 0) {
1043 st->print_raw_cr("<not set>");
1044 } else {
1045 st->print_raw_cr(path, len);
1046 }
1047 }
1048 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1049 }
1050
1051 void Arguments::print_summary_on(outputStream* st) {
1052 // Print the command line. Environment variables that are helpful for
1053 // reproducing the problem are written later in the hs_err file.
1054 // flags are from setting file
1055 if (num_jvm_flags() > 0) {
1056 st->print_raw("Settings File: ");
1057 print_jvm_flags_on(st);
1058 st->cr();
1059 }
1060 // args are the command line and environment variable arguments.
1061 st->print_raw("Command Line: ");
1062 if (num_jvm_args() > 0) {
1063 print_jvm_args_on(st);
1064 }
1065 // this is the classfile and any arguments to the java program
1066 if (java_command() != nullptr) {
1067 st->print("%s", java_command());
1068 }
1069 st->cr();
1070 }
1071
1072 void Arguments::print_jvm_flags_on(outputStream* st) {
1073 if (_num_jvm_flags > 0) {
1074 for (int i=0; i < _num_jvm_flags; i++) {
1075 st->print("%s ", _jvm_flags_array[i]);
1076 }
1077 }
1078 }
1079
1080 void Arguments::print_jvm_args_on(outputStream* st) {
1081 if (_num_jvm_args > 0) {
1082 for (int i=0; i < _num_jvm_args; i++) {
1083 st->print("%s ", _jvm_args_array[i]);
1084 }
1085 }
1086 }
1087
1088 bool Arguments::process_argument(const char* arg,
1089 jboolean ignore_unrecognized,
1090 JVMFlagOrigin origin) {
1091 JDK_Version since = JDK_Version();
1092
1093 if (parse_argument(arg, origin)) {
1094 return true;
1095 }
1096
1097 // Determine if the flag has '+', '-', or '=' characters.
1098 bool has_plus_minus = (*arg == '+' || *arg == '-');
1099 const char* const argname = has_plus_minus ? arg + 1 : arg;
1100
1101 size_t arg_len;
1102 const char* equal_sign = strchr(argname, '=');
1103 if (equal_sign == nullptr) {
1104 arg_len = strlen(argname);
1105 } else {
1106 arg_len = equal_sign - argname;
1107 }
1108
1109 // Only make the obsolete check for valid arguments.
1110 if (arg_len <= BUFLEN) {
1111 // Construct a string which consists only of the argument name without '+', '-', or '='.
1112 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1113 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1114 if (is_obsolete_flag(stripped_argname, &since)) {
1115 char version[256];
1116 since.to_string(version, sizeof(version));
1117 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1118 return true;
1119 }
1120 }
1121
1122 // For locked flags, report a custom error message if available.
1123 // Otherwise, report the standard unrecognized VM option.
1124 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1125 if (found_flag != nullptr) {
1126 char locked_message_buf[BUFLEN];
1127 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1128 if (strlen(locked_message_buf) != 0) {
1129 #ifdef PRODUCT
1130 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1131 if (ignore_unrecognized && mismatched) {
1132 return true;
1133 }
1134 #endif
1135 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1136 }
1137 if (found_flag->is_bool() && !has_plus_minus) {
1138 jio_fprintf(defaultStream::error_stream(),
1139 "Missing +/- setting for VM option '%s'\n", argname);
1140 } else if (!found_flag->is_bool() && has_plus_minus) {
1141 jio_fprintf(defaultStream::error_stream(),
1142 "Unexpected +/- setting in VM option '%s'\n", argname);
1143 } else {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Improperly specified VM option '%s'\n", argname);
1146 }
1147 } else {
1148 if (ignore_unrecognized) {
1149 return true;
1150 }
1151 jio_fprintf(defaultStream::error_stream(),
1152 "Unrecognized VM option '%s'\n", argname);
1153 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1154 if (fuzzy_matched != nullptr) {
1155 jio_fprintf(defaultStream::error_stream(),
1156 "Did you mean '%s%s%s'?\n",
1157 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1158 fuzzy_matched->name(),
1159 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1160 }
1161 }
1162
1163 // allow for commandline "commenting out" options like -XX:#+Verbose
1164 return arg[0] == '#';
1165 }
1166
1167 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1168 FILE* stream = os::fopen(file_name, "rb");
1169 if (stream == nullptr) {
1170 if (should_exist) {
1171 jio_fprintf(defaultStream::error_stream(),
1172 "Could not open settings file %s\n", file_name);
1173 return false;
1174 } else {
1175 return true;
1176 }
1177 }
1178
1179 char token[1024];
1180 int pos = 0;
1181
1182 bool in_white_space = true;
1183 bool in_comment = false;
1184 bool in_quote = false;
1185 int quote_c = 0;
1186 bool result = true;
1187
1188 int c = getc(stream);
1189 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1190 if (in_white_space) {
1191 if (in_comment) {
1192 if (c == '\n') in_comment = false;
1193 } else {
1194 if (c == '#') in_comment = true;
1195 else if (!isspace((unsigned char) c)) {
1196 in_white_space = false;
1197 token[pos++] = checked_cast<char>(c);
1198 }
1199 }
1200 } else {
1201 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1202 // token ends at newline, or at unquoted whitespace
1203 // this allows a way to include spaces in string-valued options
1204 token[pos] = '\0';
1205 logOption(token);
1206 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1207 build_jvm_flags(token);
1208 pos = 0;
1209 in_white_space = true;
1210 in_quote = false;
1211 } else if (!in_quote && (c == '\'' || c == '"')) {
1212 in_quote = true;
1213 quote_c = c;
1214 } else if (in_quote && (c == quote_c)) {
1215 in_quote = false;
1216 } else {
1217 token[pos++] = checked_cast<char>(c);
1218 }
1219 }
1220 c = getc(stream);
1221 }
1222 if (pos > 0) {
1223 token[pos] = '\0';
1224 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1225 build_jvm_flags(token);
1226 }
1227 fclose(stream);
1228 return result;
1229 }
1230
1231 //=============================================================================================================
1232 // Parsing of properties (-D)
1233
1234 const char* Arguments::get_property(const char* key) {
1235 return PropertyList_get_value(system_properties(), key);
1236 }
1237
1238 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1239 const char* eq = strchr(prop, '=');
1240 const char* key;
1241 const char* value = "";
1242
1243 if (eq == nullptr) {
1244 // property doesn't have a value, thus use passed string
1245 key = prop;
1246 } else {
1247 // property have a value, thus extract it and save to the
1248 // allocated string
1249 size_t key_len = eq - prop;
1250 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1251
1252 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1253 key = tmp_key;
1254
1255 value = &prop[key_len + 1];
1256 }
1257
1258 if (internal == ExternalProperty) {
1259 CDSConfig::check_incompatible_property(key, value);
1260 }
1261
1262 if (strcmp(key, "java.compiler") == 0) {
1263 // we no longer support java.compiler system property, log a warning and let it get
1264 // passed to Java, like any other system property
1265 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1266 // for applications using NONE or empty value, log a more informative message
1267 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1268 } else {
1269 warning("The java.compiler system property is obsolete and no longer supported.");
1270 }
1271 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1272 // sun.java.launcher.is_altjvm property is
1273 // private and is processed in process_sun_java_launcher_properties();
1274 // the sun.java.launcher property is passed on to the java application
1275 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1276 // append is true, writable is true, internal is false
1277 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1278 WriteableProperty, ExternalProperty);
1279 } else {
1280 if (strcmp(key, "sun.java.command") == 0) {
1281 char *old_java_command = _java_command;
1282 _java_command = os::strdup_check_oom(value, mtArguments);
1283 if (old_java_command != nullptr) {
1284 os::free(old_java_command);
1285 }
1286 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1287 // If this property is set on the command line then its value will be
1288 // displayed in VM error logs as the URL at which to submit such logs.
1289 // Normally the URL displayed in error logs is different from the value
1290 // of this system property, so a different property should have been
1291 // used here, but we leave this as-is in case someone depends upon it.
1292 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1293 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1294 // its value without going through the property list or making a Java call.
1295 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1296 if (old_java_vendor_url_bug != nullptr) {
1297 os::free((void *)old_java_vendor_url_bug);
1298 }
1299 }
1300
1301 // Create new property and add at the end of the list
1302 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1303 }
1304
1305 if (key != prop) {
1306 // SystemProperty copy passed value, thus free previously allocated
1307 // memory
1308 FreeHeap((void *)key);
1309 }
1310
1311 return true;
1312 }
1313
1314 //===========================================================================================================
1315 // Setting int/mixed/comp mode flags
1316
1317 void Arguments::set_mode_flags(Mode mode) {
1318 // Set up default values for all flags.
1319 // If you add a flag to any of the branches below,
1320 // add a default value for it here.
1321 _mode = mode;
1322
1323 // Ensure Agent_OnLoad has the correct initial values.
1324 // This may not be the final mode; mode may change later in onload phase.
1325 PropertyList_unique_add(&_system_properties, "java.vm.info",
1326 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1327
1328 UseInterpreter = true;
1329 UseCompiler = true;
1330 UseLoopCounter = true;
1331
1332 // Default values may be platform/compiler dependent -
1333 // use the saved values
1334 ClipInlining = Arguments::_ClipInlining;
1335 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1336 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1337 BackgroundCompilation = Arguments::_BackgroundCompilation;
1338
1339 // Change from defaults based on mode
1340 switch (mode) {
1341 default:
1342 ShouldNotReachHere();
1343 break;
1344 case _int:
1345 UseCompiler = false;
1346 UseLoopCounter = false;
1347 AlwaysCompileLoopMethods = false;
1348 UseOnStackReplacement = false;
1349 break;
1350 case _mixed:
1351 // same as default
1352 break;
1353 case _comp:
1354 UseInterpreter = false;
1355 BackgroundCompilation = false;
1356 ClipInlining = false;
1357 break;
1358 }
1359 }
1360
1361 // Conflict: required to use shared spaces (-Xshare:on), but
1362 // incompatible command line options were chosen.
1363 void Arguments::no_shared_spaces(const char* message) {
1364 if (RequireSharedSpaces) {
1365 jio_fprintf(defaultStream::error_stream(),
1366 "Class data sharing is inconsistent with other specified options.\n");
1367 vm_exit_during_initialization("Unable to use shared archive", message);
1368 } else {
1369 log_info(cds)("Unable to use shared archive: %s", message);
1370 UseSharedSpaces = false;
1371 }
1372 }
1373
1374 static void set_object_alignment() {
1375 // Object alignment.
1376 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1377 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1378 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1379 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1380 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1381 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1382
1383 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1384 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1385
1386 // Oop encoding heap max
1387 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1388 }
1389
1390 size_t Arguments::max_heap_for_compressed_oops() {
1391 // Avoid sign flip.
1392 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1393 // We need to fit both the null page and the heap into the memory budget, while
1394 // keeping alignment constraints of the heap. To guarantee the latter, as the
1395 // null page is located before the heap, we pad the null page to the conservative
1396 // maximum alignment that the GC may ever impose upon the heap.
1397 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1398 _conservative_max_heap_alignment);
1399
1400 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1401 NOT_LP64(ShouldNotReachHere(); return 0);
1402 }
1403
1404 void Arguments::set_use_compressed_oops() {
1405 #ifdef _LP64
1406 // MaxHeapSize is not set up properly at this point, but
1407 // the only value that can override MaxHeapSize if we are
1408 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1409 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1410
1411 if (max_heap_size <= max_heap_for_compressed_oops()) {
1412 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1413 FLAG_SET_ERGO(UseCompressedOops, true);
1414 }
1415 } else {
1416 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1417 warning("Max heap size too large for Compressed Oops");
1418 FLAG_SET_DEFAULT(UseCompressedOops, false);
1419 }
1420 }
1421 #endif // _LP64
1422 }
1423
1424 void Arguments::set_use_compressed_klass_ptrs() {
1425 #ifdef _LP64
1426 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1427 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1428 #endif // _LP64
1429 }
1430
1431 void Arguments::set_conservative_max_heap_alignment() {
1432 // The conservative maximum required alignment for the heap is the maximum of
1433 // the alignments imposed by several sources: any requirements from the heap
1434 // itself and the maximum page size we may run the VM with.
1435 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1436 _conservative_max_heap_alignment = MAX4(heap_alignment,
1437 os::vm_allocation_granularity(),
1438 os::max_page_size(),
1439 GCArguments::compute_heap_alignment());
1440 }
1441
1442 jint Arguments::set_ergonomics_flags() {
1443 GCConfig::initialize();
1444
1445 set_conservative_max_heap_alignment();
1446
1447 #ifdef _LP64
1448 set_use_compressed_oops();
1449 set_use_compressed_klass_ptrs();
1450
1451 // Also checks that certain machines are slower with compressed oops
1452 // in vm_version initialization code.
1453 #endif // _LP64
1454
1455 return JNI_OK;
1456 }
1457
1458 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1459 size_t max_allocatable;
1460 size_t result = limit;
1461 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1462 // The AggressiveHeap check is a temporary workaround to avoid calling
1463 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1464 // selected. This works because AggressiveHeap implies UseParallelGC
1465 // where we know the ratio will be 1. Once the AggressiveHeap option is
1466 // removed, this can be cleaned up.
1467 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1468 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1469 result = MIN2(result, max_allocatable / fraction);
1470 }
1471 return result;
1472 }
1473
1474 // Use static initialization to get the default before parsing
1475 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1476
1477 void Arguments::set_heap_size() {
1478 julong phys_mem;
1479
1480 // If the user specified one of these options, they
1481 // want specific memory sizing so do not limit memory
1482 // based on compressed oops addressability.
1483 // Also, memory limits will be calculated based on
1484 // available os physical memory, not our MaxRAM limit,
1485 // unless MaxRAM is also specified.
1486 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1487 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1488 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1489 !FLAG_IS_DEFAULT(MaxRAM));
1490 if (override_coop_limit) {
1491 if (FLAG_IS_DEFAULT(MaxRAM)) {
1492 phys_mem = os::physical_memory();
1493 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1494 } else {
1495 phys_mem = (julong)MaxRAM;
1496 }
1497 } else {
1498 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1499 : (julong)MaxRAM;
1500 }
1501
1502 // If the maximum heap size has not been set with -Xmx,
1503 // then set it as fraction of the size of physical memory,
1504 // respecting the maximum and minimum sizes of the heap.
1505 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1506 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1507 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1508 if (reasonable_min < MaxHeapSize) {
1509 // Small physical memory, so use a minimum fraction of it for the heap
1510 reasonable_max = reasonable_min;
1511 } else {
1512 // Not-small physical memory, so require a heap at least
1513 // as large as MaxHeapSize
1514 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1515 }
1516
1517 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1518 // Limit the heap size to ErgoHeapSizeLimit
1519 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1520 }
1521
1522 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1523
1524 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1525 // An initial heap size was specified on the command line,
1526 // so be sure that the maximum size is consistent. Done
1527 // after call to limit_heap_by_allocatable_memory because that
1528 // method might reduce the allocation size.
1529 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1530 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1531 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1532 }
1533
1534 #ifdef _LP64
1535 if (UseCompressedOops || UseCompressedClassPointers) {
1536 // HeapBaseMinAddress can be greater than default but not less than.
1537 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1538 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1539 // matches compressed oops printing flags
1540 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1541 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1542 DefaultHeapBaseMinAddress,
1543 DefaultHeapBaseMinAddress/G,
1544 HeapBaseMinAddress);
1545 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1546 }
1547 }
1548 }
1549 if (UseCompressedOops) {
1550 // Limit the heap size to the maximum possible when using compressed oops
1551 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1552
1553 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1554 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1555 // but it should be not less than default MaxHeapSize.
1556 max_coop_heap -= HeapBaseMinAddress;
1557 }
1558
1559 // If user specified flags prioritizing os physical
1560 // memory limits, then disable compressed oops if
1561 // limits exceed max_coop_heap and UseCompressedOops
1562 // was not specified.
1563 if (reasonable_max > max_coop_heap) {
1564 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1565 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1566 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1567 "Please check the setting of MaxRAMPercentage %5.2f."
1568 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1569 FLAG_SET_ERGO(UseCompressedOops, false);
1570 } else {
1571 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1572 }
1573 }
1574 }
1575 #endif // _LP64
1576
1577 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1578 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1579 }
1580
1581 // If the minimum or initial heap_size have not been set or requested to be set
1582 // ergonomically, set them accordingly.
1583 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1584 julong reasonable_minimum = (julong)(OldSize + NewSize);
1585
1586 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1587
1588 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1589
1590 if (InitialHeapSize == 0) {
1591 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1592 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1593
1594 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1595 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1596
1597 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1598 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1599 }
1600 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1601 // synchronize with InitialHeapSize to avoid errors with the default value.
1602 if (MinHeapSize == 0) {
1603 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1604 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1605 }
1606 }
1607 }
1608
1609 // This option inspects the machine and attempts to set various
1610 // parameters to be optimal for long-running, memory allocation
1611 // intensive jobs. It is intended for machines with large
1612 // amounts of cpu and memory.
1613 jint Arguments::set_aggressive_heap_flags() {
1614 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1615 // VM, but we may not be able to represent the total physical memory
1616 // available (like having 8gb of memory on a box but using a 32bit VM).
1617 // Thus, we need to make sure we're using a julong for intermediate
1618 // calculations.
1619 julong initHeapSize;
1620 julong total_memory = os::physical_memory();
1621
1622 if (total_memory < (julong) 256 * M) {
1623 jio_fprintf(defaultStream::error_stream(),
1624 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1625 vm_exit(1);
1626 }
1627
1628 // The heap size is half of available memory, or (at most)
1629 // all of possible memory less 160mb (leaving room for the OS
1630 // when using ISM). This is the maximum; because adaptive sizing
1631 // is turned on below, the actual space used may be smaller.
1632
1633 initHeapSize = MIN2(total_memory / (julong) 2,
1634 total_memory - (julong) 160 * M);
1635
1636 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1637
1638 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1639 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1640 return JNI_EINVAL;
1641 }
1642 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1643 return JNI_EINVAL;
1644 }
1645 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1646 return JNI_EINVAL;
1647 }
1648 }
1649 if (FLAG_IS_DEFAULT(NewSize)) {
1650 // Make the young generation 3/8ths of the total heap.
1651 if (FLAG_SET_CMDLINE(NewSize,
1652 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1653 return JNI_EINVAL;
1654 }
1655 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1656 return JNI_EINVAL;
1657 }
1658 }
1659
1660 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1661 FLAG_SET_DEFAULT(UseLargePages, true);
1662 #endif
1663
1664 // Increase some data structure sizes for efficiency
1665 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1666 return JNI_EINVAL;
1667 }
1668 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1669 return JNI_EINVAL;
1670 }
1671
1672 // See the OldPLABSize comment below, but replace 'after promotion'
1673 // with 'after copying'. YoungPLABSize is the size of the survivor
1674 // space per-gc-thread buffers. The default is 4kw.
1675 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1676 return JNI_EINVAL;
1677 }
1678
1679 // OldPLABSize is the size of the buffers in the old gen that
1680 // UseParallelGC uses to promote live data that doesn't fit in the
1681 // survivor spaces. At any given time, there's one for each gc thread.
1682 // The default size is 1kw. These buffers are rarely used, since the
1683 // survivor spaces are usually big enough. For specjbb, however, there
1684 // are occasions when there's lots of live data in the young gen
1685 // and we end up promoting some of it. We don't have a definite
1686 // explanation for why bumping OldPLABSize helps, but the theory
1687 // is that a bigger PLAB results in retaining something like the
1688 // original allocation order after promotion, which improves mutator
1689 // locality. A minor effect may be that larger PLABs reduce the
1690 // number of PLAB allocation events during gc. The value of 8kw
1691 // was arrived at by experimenting with specjbb.
1692 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1693 return JNI_EINVAL;
1694 }
1695
1696 // Enable parallel GC and adaptive generation sizing
1697 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1698 return JNI_EINVAL;
1699 }
1700
1701 // Encourage steady state memory management
1702 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1703 return JNI_EINVAL;
1704 }
1705
1706 return JNI_OK;
1707 }
1708
1709 // This must be called after ergonomics.
1710 void Arguments::set_bytecode_flags() {
1711 if (!RewriteBytecodes) {
1712 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1713 }
1714 }
1715
1716 // Aggressive optimization flags
1717 jint Arguments::set_aggressive_opts_flags() {
1718 #ifdef COMPILER2
1719 if (AggressiveUnboxing) {
1720 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1721 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1722 } else if (!EliminateAutoBox) {
1723 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1724 AggressiveUnboxing = false;
1725 }
1726 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1727 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1728 } else if (!DoEscapeAnalysis) {
1729 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1730 AggressiveUnboxing = false;
1731 }
1732 }
1733 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1734 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1735 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1736 }
1737 // Feed the cache size setting into the JDK
1738 char buffer[1024];
1739 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1740 if (!add_property(buffer)) {
1741 return JNI_ENOMEM;
1742 }
1743 }
1744 #endif
1745
1746 return JNI_OK;
1747 }
1748
1749 //===========================================================================================================
1750
1751 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1752 if (_sun_java_launcher != _default_java_launcher) {
1753 os::free(const_cast<char*>(_sun_java_launcher));
1754 }
1755 _sun_java_launcher = os::strdup_check_oom(launcher);
1756 }
1757
1758 bool Arguments::created_by_java_launcher() {
1759 assert(_sun_java_launcher != nullptr, "property must have value");
1760 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1761 }
1762
1763 bool Arguments::sun_java_launcher_is_altjvm() {
1764 return _sun_java_launcher_is_altjvm;
1765 }
1766
1767 //===========================================================================================================
1768 // Parsing of main arguments
1769
1770 unsigned int addreads_count = 0;
1771 unsigned int addexports_count = 0;
1772 unsigned int addopens_count = 0;
1773 unsigned int addmods_count = 0;
1774 unsigned int enable_native_access_count = 0;
1775
1776 // Check the consistency of vm_init_args
1777 bool Arguments::check_vm_args_consistency() {
1778 // Method for adding checks for flag consistency.
1779 // The intent is to warn the user of all possible conflicts,
1780 // before returning an error.
1781 // Note: Needs platform-dependent factoring.
1782 bool status = true;
1783
1784 if (TLABRefillWasteFraction == 0) {
1785 jio_fprintf(defaultStream::error_stream(),
1786 "TLABRefillWasteFraction should be a denominator, "
1787 "not " SIZE_FORMAT "\n",
1788 TLABRefillWasteFraction);
1789 status = false;
1790 }
1791
1792 status = CompilerConfig::check_args_consistency(status);
1793 #if INCLUDE_JVMCI
1794 if (status && EnableJVMCI) {
1795 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1796 AddProperty, UnwriteableProperty, InternalProperty);
1797 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1798 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1799 return false;
1800 }
1801 }
1802 }
1803 #endif
1804
1805 #if INCLUDE_JFR
1806 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1807 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1808 return false;
1809 }
1810 }
1811 #endif
1812
1813 #ifndef SUPPORT_RESERVED_STACK_AREA
1814 if (StackReservedPages != 0) {
1815 FLAG_SET_CMDLINE(StackReservedPages, 0);
1816 warning("Reserved Stack Area not supported on this platform");
1817 }
1818 #endif
1819
1820 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypePassFieldsAsArgs)) {
1821 FLAG_SET_CMDLINE(InlineTypePassFieldsAsArgs, false);
1822 warning("InlineTypePassFieldsAsArgs is not supported on this platform");
1823 }
1824
1825 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypeReturnedAsFields)) {
1826 FLAG_SET_CMDLINE(InlineTypeReturnedAsFields, false);
1827 warning("InlineTypeReturnedAsFields is not supported on this platform");
1828 }
1829
1830 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1831 if (LockingMode == LM_LIGHTWEIGHT) {
1832 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1833 warning("New lightweight locking not supported on this platform");
1834 }
1835 if (UseObjectMonitorTable) {
1836 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1837 warning("UseObjectMonitorTable not supported on this platform");
1838 }
1839 #endif
1840
1841 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1842 // ObjectMonitorTable requires lightweight locking.
1843 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1844 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1845 }
1846
1847 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1848 if (LockingMode == LM_MONITOR) {
1849 jio_fprintf(defaultStream::error_stream(),
1850 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1851 return false;
1852 }
1853 #endif
1854 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1855 jio_fprintf(defaultStream::error_stream(),
1856 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1857 return false;
1858 }
1859 return status;
1860 }
1861
1862 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1863 const char* option_type) {
1864 if (ignore) return false;
1865
1866 const char* spacer = " ";
1867 if (option_type == nullptr) {
1868 option_type = ++spacer; // Set both to the empty string.
1869 }
1870
1871 jio_fprintf(defaultStream::error_stream(),
1872 "Unrecognized %s%soption: %s\n", option_type, spacer,
1873 option->optionString);
1874 return true;
1875 }
1876
1877 static const char* user_assertion_options[] = {
1878 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1879 };
1880
1881 static const char* system_assertion_options[] = {
1882 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1883 };
1884
1885 bool Arguments::parse_uint(const char* value,
1886 uint* uint_arg,
1887 uint min_size) {
1888 uint n;
1889 if (!parse_integer(value, &n)) {
1890 return false;
1891 }
1892 if (n >= min_size) {
1893 *uint_arg = n;
1894 return true;
1895 } else {
1896 return false;
1897 }
1898 }
1899
1900 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1901 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1902 CDSConfig::check_internal_module_property(prop_name, prop_value);
1903 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1904 char* property = AllocateHeap(prop_len, mtArguments);
1905 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1906 if (ret < 0 || ret >= (int)prop_len) {
1907 FreeHeap(property);
1908 return false;
1909 }
1910 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1911 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1912 // that multiple occurrences of the associated flag just causes the existing property value to be
1913 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1914 // to a property after we have finished flag processing.
1915 bool added = add_property(property, WriteableProperty, internal);
1916 FreeHeap(property);
1917 return added;
1918 }
1919
1920 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1921 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1922 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1923 const unsigned int props_count_limit = 1000;
1924 const int max_digits = 3;
1925 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1926
1927 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1928 if (count < props_count_limit) {
1929 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1930 char* property = AllocateHeap(prop_len, mtArguments);
1931 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1932 if (ret < 0 || ret >= (int)prop_len) {
1933 FreeHeap(property);
1934 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1935 return false;
1936 }
1937 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1938 FreeHeap(property);
1939 return added;
1940 }
1941
1942 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1943 return false;
1944 }
1945
1946 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1947 julong* long_arg,
1948 julong min_size,
1949 julong max_size) {
1950 if (!parse_integer(s, long_arg)) return arg_unreadable;
1951 return check_memory_size(*long_arg, min_size, max_size);
1952 }
1953
1954 // Parse JavaVMInitArgs structure
1955
1956 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1957 const JavaVMInitArgs *java_tool_options_args,
1958 const JavaVMInitArgs *java_options_args,
1959 const JavaVMInitArgs *cmd_line_args) {
1960 // Save default settings for some mode flags
1961 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1962 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1963 Arguments::_ClipInlining = ClipInlining;
1964 Arguments::_BackgroundCompilation = BackgroundCompilation;
1965
1966 // Remember the default value of SharedBaseAddress.
1967 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1968
1969 // Setup flags for mixed which is the default
1970 set_mode_flags(_mixed);
1971
1972 // Parse args structure generated from java.base vm options resource
1973 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1974 if (result != JNI_OK) {
1975 return result;
1976 }
1977
1978 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1979 // variable (if present).
1980 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1981 if (result != JNI_OK) {
1982 return result;
1983 }
1984
1985 // Parse args structure generated from the command line flags.
1986 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
1987 if (result != JNI_OK) {
1988 return result;
1989 }
1990
1991 // Parse args structure generated from the _JAVA_OPTIONS environment
1992 // variable (if present) (mimics classic VM)
1993 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
1994 if (result != JNI_OK) {
1995 return result;
1996 }
1997
1998 // Disable CDS for exploded image
1999 if (!has_jimage()) {
2000 no_shared_spaces("CDS disabled on exploded JDK");
2001 }
2002
2003 // We need to ensure processor and memory resources have been properly
2004 // configured - which may rely on arguments we just processed - before
2005 // doing the final argument processing. Any argument processing that
2006 // needs to know about processor and memory resources must occur after
2007 // this point.
2008
2009 os::init_container_support();
2010
2011 SystemMemoryBarrier::initialize();
2012
2013 // Do final processing now that all arguments have been parsed
2014 result = finalize_vm_init_args();
2015 if (result != JNI_OK) {
2016 return result;
2017 }
2018
2019 return JNI_OK;
2020 }
2021
2022 #if !INCLUDE_JVMTI
2023 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2024 // represents a valid JDWP agent. is_path==true denotes that we
2025 // are dealing with -agentpath (case where name is a path), otherwise with
2026 // -agentlib
2027 static bool valid_jdwp_agent(char *name, bool is_path) {
2028 char *_name;
2029 const char *_jdwp = "jdwp";
2030 size_t _len_jdwp, _len_prefix;
2031
2032 if (is_path) {
2033 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2034 return false;
2035 }
2036
2037 _name++; // skip past last path separator
2038 _len_prefix = strlen(JNI_LIB_PREFIX);
2039
2040 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2041 return false;
2042 }
2043
2044 _name += _len_prefix;
2045 _len_jdwp = strlen(_jdwp);
2046
2047 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2048 _name += _len_jdwp;
2049 }
2050 else {
2051 return false;
2052 }
2053
2054 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2055 return false;
2056 }
2057
2058 return true;
2059 }
2060
2061 if (strcmp(name, _jdwp) == 0) {
2062 return true;
2063 }
2064
2065 return false;
2066 }
2067 #endif
2068
2069 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2070 // --patch-module=<module>=<file>(<pathsep><file>)*
2071 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2072 // Find the equal sign between the module name and the path specification
2073 const char* module_equal = strchr(patch_mod_tail, '=');
2074 if (module_equal == nullptr) {
2075 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2076 return JNI_ERR;
2077 } else {
2078 // Pick out the module name
2079 size_t module_len = module_equal - patch_mod_tail;
2080 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2081 if (module_name != nullptr) {
2082 memcpy(module_name, patch_mod_tail, module_len);
2083 *(module_name + module_len) = '\0';
2084 // The path piece begins one past the module_equal sign
2085 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2086 FREE_C_HEAP_ARRAY(char, module_name);
2087 } else {
2088 return JNI_ENOMEM;
2089 }
2090 }
2091 return JNI_OK;
2092 }
2093
2094 // VALUECLASS_STR must match string used in the build
2095 #define VALUECLASS_STR "valueclasses"
2096 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2097
2098 // Finalize --patch-module args and --enable-preview related to value class module patches.
2099 // Create all numbered properties passing module patches.
2100 int Arguments::finalize_patch_module() {
2101 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2102 // are to be patched into the module.
2103 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2104 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2105 if (enable_preview() && EnableValhalla) {
2106 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2107 const char * fileSep = os::file_separator();
2108
2109 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2110 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2111 DIR* dir = os::opendir(valueclasses_dir);
2112 if (dir != nullptr) {
2113 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2114 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2115
2116 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2117 // Test if file ends-with "-valueclasses.jar"
2118 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2119 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2120 continue; // too short or not the expected suffix
2121 }
2122
2123 strcpy(module_name, entry->d_name);
2124 module_name[len] = '\0'; // truncate to just module-name
2125
2126 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2127 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2128 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2129 }
2130 FreeHeap(module_name);
2131 FreeHeap(path);
2132 os::closedir(dir);
2133 }
2134 FreeHeap(valueclasses_dir);
2135 }
2136
2137 // Create numbered properties for each module that has been patched either
2138 // by --patch-module or --enable-preview
2139 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2140 if (_patch_mod_prefix != nullptr) {
2141 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2142 unsigned int patch_mod_count = 0;
2143
2144 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2145 it != _patch_mod_prefix->end(); ++it) {
2146 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2147 (*it)->module_name(), (*it)->path_string());
2148 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2149 FreeHeap(prop_value);
2150 return JNI_ENOMEM;
2151 }
2152 }
2153 FreeHeap(prop_value);
2154 }
2155 return JNI_OK;
2156 }
2157
2158 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2159 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2160 // The min and max sizes match the values in globals.hpp, but scaled
2161 // with K. The values have been chosen so that alignment with page
2162 // size doesn't change the max value, which makes the conversions
2163 // back and forth between Xss value and ThreadStackSize value easier.
2164 // The values have also been chosen to fit inside a 32-bit signed type.
2165 const julong min_ThreadStackSize = 0;
2166 const julong max_ThreadStackSize = 1 * M;
2167
2168 // Make sure the above values match the range set in globals.hpp
2169 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2170 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2171 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2172
2173 const julong min_size = min_ThreadStackSize * K;
2174 const julong max_size = max_ThreadStackSize * K;
2175
2176 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2177
2178 julong size = 0;
2179 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2180 if (errcode != arg_in_range) {
2181 bool silent = (option == nullptr); // Allow testing to silence error messages
2182 if (!silent) {
2183 jio_fprintf(defaultStream::error_stream(),
2184 "Invalid thread stack size: %s\n", option->optionString);
2185 describe_range_error(errcode);
2186 }
2187 return JNI_EINVAL;
2188 }
2189
2190 // Internally track ThreadStackSize in units of 1024 bytes.
2191 const julong size_aligned = align_up(size, K);
2192 assert(size <= size_aligned,
2193 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2194 size, size_aligned);
2195
2196 const julong size_in_K = size_aligned / K;
2197 assert(size_in_K < (julong)max_intx,
2198 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2199 size_in_K);
2200
2201 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2202 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2203 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2204 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2205 max_expanded, size_in_K);
2206
2207 *out_ThreadStackSize = (intx)size_in_K;
2208
2209 return JNI_OK;
2210 }
2211
2212 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2213 // For match_option to return remaining or value part of option string
2214 const char* tail;
2215
2216 // iterate over arguments
2217 for (int index = 0; index < args->nOptions; index++) {
2218 bool is_absolute_path = false; // for -agentpath vs -agentlib
2219
2220 const JavaVMOption* option = args->options + index;
2221
2222 if (!match_option(option, "-Djava.class.path", &tail) &&
2223 !match_option(option, "-Dsun.java.command", &tail) &&
2224 !match_option(option, "-Dsun.java.launcher", &tail)) {
2225
2226 // add all jvm options to the jvm_args string. This string
2227 // is used later to set the java.vm.args PerfData string constant.
2228 // the -Djava.class.path and the -Dsun.java.command options are
2229 // omitted from jvm_args string as each have their own PerfData
2230 // string constant object.
2231 build_jvm_args(option->optionString);
2232 }
2233
2234 // -verbose:[class/module/gc/jni]
2235 if (match_option(option, "-verbose", &tail)) {
2236 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2237 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2238 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2239 } else if (!strcmp(tail, ":module")) {
2240 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2241 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2242 } else if (!strcmp(tail, ":gc")) {
2243 if (_legacyGCLogging.lastFlag == 0) {
2244 _legacyGCLogging.lastFlag = 1;
2245 }
2246 } else if (!strcmp(tail, ":jni")) {
2247 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2248 }
2249 // -da / -ea / -disableassertions / -enableassertions
2250 // These accept an optional class/package name separated by a colon, e.g.,
2251 // -da:java.lang.Thread.
2252 } else if (match_option(option, user_assertion_options, &tail, true)) {
2253 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2254 if (*tail == '\0') {
2255 JavaAssertions::setUserClassDefault(enable);
2256 } else {
2257 assert(*tail == ':', "bogus match by match_option()");
2258 JavaAssertions::addOption(tail + 1, enable);
2259 }
2260 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2261 } else if (match_option(option, system_assertion_options, &tail, false)) {
2262 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2263 JavaAssertions::setSystemClassDefault(enable);
2264 // -bootclasspath:
2265 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2266 jio_fprintf(defaultStream::output_stream(),
2267 "-Xbootclasspath is no longer a supported option.\n");
2268 return JNI_EINVAL;
2269 // -bootclasspath/a:
2270 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2271 Arguments::append_sysclasspath(tail);
2272 // -bootclasspath/p:
2273 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2274 jio_fprintf(defaultStream::output_stream(),
2275 "-Xbootclasspath/p is no longer a supported option.\n");
2276 return JNI_EINVAL;
2277 // -Xrun
2278 } else if (match_option(option, "-Xrun", &tail)) {
2279 if (tail != nullptr) {
2280 const char* pos = strchr(tail, ':');
2281 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2282 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2283 jio_snprintf(name, len + 1, "%s", tail);
2284
2285 char *options = nullptr;
2286 if(pos != nullptr) {
2287 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2288 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2289 }
2290 #if !INCLUDE_JVMTI
2291 if (strcmp(name, "jdwp") == 0) {
2292 jio_fprintf(defaultStream::error_stream(),
2293 "Debugging agents are not supported in this VM\n");
2294 return JNI_ERR;
2295 }
2296 #endif // !INCLUDE_JVMTI
2297 JvmtiAgentList::add_xrun(name, options, false);
2298 FREE_C_HEAP_ARRAY(char, name);
2299 FREE_C_HEAP_ARRAY(char, options);
2300 }
2301 } else if (match_option(option, "--add-reads=", &tail)) {
2302 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2303 return JNI_ENOMEM;
2304 }
2305 } else if (match_option(option, "--add-exports=", &tail)) {
2306 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2307 return JNI_ENOMEM;
2308 }
2309 } else if (match_option(option, "--add-opens=", &tail)) {
2310 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2311 return JNI_ENOMEM;
2312 }
2313 } else if (match_option(option, "--add-modules=", &tail)) {
2314 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2315 return JNI_ENOMEM;
2316 }
2317 } else if (match_option(option, "--enable-native-access=", &tail)) {
2318 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2319 return JNI_ENOMEM;
2320 }
2321 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2322 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2323 return JNI_ENOMEM;
2324 }
2325 } else if (match_option(option, "--limit-modules=", &tail)) {
2326 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2327 return JNI_ENOMEM;
2328 }
2329 } else if (match_option(option, "--module-path=", &tail)) {
2330 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2331 return JNI_ENOMEM;
2332 }
2333 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2334 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2335 return JNI_ENOMEM;
2336 }
2337 } else if (match_option(option, "--patch-module=", &tail)) {
2338 // --patch-module=<module>=<file>(<pathsep><file>)*
2339 int res = process_patch_mod_option(tail);
2340 if (res != JNI_OK) {
2341 return res;
2342 }
2343 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2344 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2345 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2346 AddProperty, WriteableProperty, InternalProperty);
2347 } else {
2348 jio_fprintf(defaultStream::error_stream(),
2349 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2350 return JNI_ERR;
2351 }
2352 } else if (match_option(option, "--illegal-access=", &tail)) {
2353 char version[256];
2354 JDK_Version::jdk(17).to_string(version, sizeof(version));
2355 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2356 // -agentlib and -agentpath
2357 } else if (match_option(option, "-agentlib:", &tail) ||
2358 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2359 if(tail != nullptr) {
2360 const char* pos = strchr(tail, '=');
2361 char* name;
2362 if (pos == nullptr) {
2363 name = os::strdup_check_oom(tail, mtArguments);
2364 } else {
2365 size_t len = pos - tail;
2366 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2367 memcpy(name, tail, len);
2368 name[len] = '\0';
2369 }
2370
2371 char *options = nullptr;
2372 if(pos != nullptr) {
2373 options = os::strdup_check_oom(pos + 1, mtArguments);
2374 }
2375 #if !INCLUDE_JVMTI
2376 if (valid_jdwp_agent(name, is_absolute_path)) {
2377 jio_fprintf(defaultStream::error_stream(),
2378 "Debugging agents are not supported in this VM\n");
2379 return JNI_ERR;
2380 }
2381 #endif // !INCLUDE_JVMTI
2382 JvmtiAgentList::add(name, options, is_absolute_path);
2383 os::free(name);
2384 os::free(options);
2385 }
2386 // -javaagent
2387 } else if (match_option(option, "-javaagent:", &tail)) {
2388 #if !INCLUDE_JVMTI
2389 jio_fprintf(defaultStream::error_stream(),
2390 "Instrumentation agents are not supported in this VM\n");
2391 return JNI_ERR;
2392 #else
2393 if (tail != nullptr) {
2394 size_t length = strlen(tail) + 1;
2395 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2396 jio_snprintf(options, length, "%s", tail);
2397 JvmtiAgentList::add("instrument", options, false);
2398 FREE_C_HEAP_ARRAY(char, options);
2399
2400 // java agents need module java.instrument
2401 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2402 return JNI_ENOMEM;
2403 }
2404 }
2405 #endif // !INCLUDE_JVMTI
2406 // --enable_preview
2407 } else if (match_option(option, "--enable-preview")) {
2408 set_enable_preview();
2409 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2410 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2411 return JNI_EINVAL;
2412 }
2413 // -Xnoclassgc
2414 } else if (match_option(option, "-Xnoclassgc")) {
2415 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2416 return JNI_EINVAL;
2417 }
2418 // -Xbatch
2419 } else if (match_option(option, "-Xbatch")) {
2420 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 // -Xmn for compatibility with other JVM vendors
2424 } else if (match_option(option, "-Xmn", &tail)) {
2425 julong long_initial_young_size = 0;
2426 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2427 if (errcode != arg_in_range) {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Invalid initial young generation size: %s\n", option->optionString);
2430 describe_range_error(errcode);
2431 return JNI_EINVAL;
2432 }
2433 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2434 return JNI_EINVAL;
2435 }
2436 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2437 return JNI_EINVAL;
2438 }
2439 // -Xms
2440 } else if (match_option(option, "-Xms", &tail)) {
2441 julong size = 0;
2442 // an initial heap size of 0 means automatically determine
2443 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2444 if (errcode != arg_in_range) {
2445 jio_fprintf(defaultStream::error_stream(),
2446 "Invalid initial heap size: %s\n", option->optionString);
2447 describe_range_error(errcode);
2448 return JNI_EINVAL;
2449 }
2450 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2451 return JNI_EINVAL;
2452 }
2453 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 // -Xmx
2457 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2458 julong long_max_heap_size = 0;
2459 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2460 if (errcode != arg_in_range) {
2461 jio_fprintf(defaultStream::error_stream(),
2462 "Invalid maximum heap size: %s\n", option->optionString);
2463 describe_range_error(errcode);
2464 return JNI_EINVAL;
2465 }
2466 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2467 return JNI_EINVAL;
2468 }
2469 // Xmaxf
2470 } else if (match_option(option, "-Xmaxf", &tail)) {
2471 char* err;
2472 int maxf = (int)(strtod(tail, &err) * 100);
2473 if (*err != '\0' || *tail == '\0') {
2474 jio_fprintf(defaultStream::error_stream(),
2475 "Bad max heap free percentage size: %s\n",
2476 option->optionString);
2477 return JNI_EINVAL;
2478 } else {
2479 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2480 return JNI_EINVAL;
2481 }
2482 }
2483 // Xminf
2484 } else if (match_option(option, "-Xminf", &tail)) {
2485 char* err;
2486 int minf = (int)(strtod(tail, &err) * 100);
2487 if (*err != '\0' || *tail == '\0') {
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Bad min heap free percentage size: %s\n",
2490 option->optionString);
2491 return JNI_EINVAL;
2492 } else {
2493 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2494 return JNI_EINVAL;
2495 }
2496 }
2497 // -Xss
2498 } else if (match_option(option, "-Xss", &tail)) {
2499 intx value = 0;
2500 jint err = parse_xss(option, tail, &value);
2501 if (err != JNI_OK) {
2502 return err;
2503 }
2504 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2505 return JNI_EINVAL;
2506 }
2507 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2508 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2509 julong long_ReservedCodeCacheSize = 0;
2510
2511 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2512 if (errcode != arg_in_range) {
2513 jio_fprintf(defaultStream::error_stream(),
2514 "Invalid maximum code cache size: %s.\n", option->optionString);
2515 return JNI_EINVAL;
2516 }
2517 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2518 return JNI_EINVAL;
2519 }
2520 // -green
2521 } else if (match_option(option, "-green")) {
2522 jio_fprintf(defaultStream::error_stream(),
2523 "Green threads support not available\n");
2524 return JNI_EINVAL;
2525 // -native
2526 } else if (match_option(option, "-native")) {
2527 // HotSpot always uses native threads, ignore silently for compatibility
2528 // -Xrs
2529 } else if (match_option(option, "-Xrs")) {
2530 // Classic/EVM option, new functionality
2531 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2532 return JNI_EINVAL;
2533 }
2534 // -Xprof
2535 } else if (match_option(option, "-Xprof")) {
2536 char version[256];
2537 // Obsolete in JDK 10
2538 JDK_Version::jdk(10).to_string(version, sizeof(version));
2539 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2540 // -Xinternalversion
2541 } else if (match_option(option, "-Xinternalversion")) {
2542 jio_fprintf(defaultStream::output_stream(), "%s\n",
2543 VM_Version::internal_vm_info_string());
2544 vm_exit(0);
2545 #ifndef PRODUCT
2546 // -Xprintflags
2547 } else if (match_option(option, "-Xprintflags")) {
2548 JVMFlag::printFlags(tty, false);
2549 vm_exit(0);
2550 #endif
2551 // -D
2552 } else if (match_option(option, "-D", &tail)) {
2553 const char* value;
2554 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2555 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2556 // abort if -Djava.endorsed.dirs is set
2557 jio_fprintf(defaultStream::output_stream(),
2558 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2559 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2560 return JNI_EINVAL;
2561 }
2562 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2563 *value != '\0' && strcmp(value, "\"\"") != 0) {
2564 // abort if -Djava.ext.dirs is set
2565 jio_fprintf(defaultStream::output_stream(),
2566 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2567 return JNI_EINVAL;
2568 }
2569 // Check for module related properties. They must be set using the modules
2570 // options. For example: use "--add-modules=java.sql", not
2571 // "-Djdk.module.addmods=java.sql"
2572 if (is_internal_module_property(option->optionString + 2)) {
2573 needs_module_property_warning = true;
2574 continue;
2575 }
2576 if (!add_property(tail)) {
2577 return JNI_ENOMEM;
2578 }
2579 // Out of the box management support
2580 if (match_option(option, "-Dcom.sun.management", &tail)) {
2581 #if INCLUDE_MANAGEMENT
2582 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2583 return JNI_EINVAL;
2584 }
2585 // management agent in module jdk.management.agent
2586 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2587 return JNI_ENOMEM;
2588 }
2589 #else
2590 jio_fprintf(defaultStream::output_stream(),
2591 "-Dcom.sun.management is not supported in this VM.\n");
2592 return JNI_ERR;
2593 #endif
2594 }
2595 // -Xint
2596 } else if (match_option(option, "-Xint")) {
2597 set_mode_flags(_int);
2598 mode_flag_cmd_line = true;
2599 // -Xmixed
2600 } else if (match_option(option, "-Xmixed")) {
2601 set_mode_flags(_mixed);
2602 mode_flag_cmd_line = true;
2603 // -Xcomp
2604 } else if (match_option(option, "-Xcomp")) {
2605 // for testing the compiler; turn off all flags that inhibit compilation
2606 set_mode_flags(_comp);
2607 mode_flag_cmd_line = true;
2608 // -Xshare:dump
2609 } else if (match_option(option, "-Xshare:dump")) {
2610 CDSConfig::enable_dumping_static_archive();
2611 // -Xshare:on
2612 } else if (match_option(option, "-Xshare:on")) {
2613 UseSharedSpaces = true;
2614 RequireSharedSpaces = true;
2615 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2616 } else if (match_option(option, "-Xshare:auto")) {
2617 UseSharedSpaces = true;
2618 RequireSharedSpaces = false;
2619 xshare_auto_cmd_line = true;
2620 // -Xshare:off
2621 } else if (match_option(option, "-Xshare:off")) {
2622 UseSharedSpaces = false;
2623 RequireSharedSpaces = false;
2624 // -Xverify
2625 } else if (match_option(option, "-Xverify", &tail)) {
2626 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2627 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2628 return JNI_EINVAL;
2629 }
2630 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2631 return JNI_EINVAL;
2632 }
2633 } else if (strcmp(tail, ":remote") == 0) {
2634 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2635 return JNI_EINVAL;
2636 }
2637 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2638 return JNI_EINVAL;
2639 }
2640 } else if (strcmp(tail, ":none") == 0) {
2641 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2645 return JNI_EINVAL;
2646 }
2647 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2648 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2649 return JNI_EINVAL;
2650 }
2651 // -Xdebug
2652 } else if (match_option(option, "-Xdebug")) {
2653 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2654 } else if (match_option(option, "-Xloggc:", &tail)) {
2655 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2656 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2657 _legacyGCLogging.lastFlag = 2;
2658 _legacyGCLogging.file = os::strdup_check_oom(tail);
2659 } else if (match_option(option, "-Xlog", &tail)) {
2660 bool ret = false;
2661 if (strcmp(tail, ":help") == 0) {
2662 fileStream stream(defaultStream::output_stream());
2663 LogConfiguration::print_command_line_help(&stream);
2664 vm_exit(0);
2665 } else if (strcmp(tail, ":disable") == 0) {
2666 LogConfiguration::disable_logging();
2667 ret = true;
2668 } else if (strcmp(tail, ":async") == 0) {
2669 LogConfiguration::set_async_mode(true);
2670 ret = true;
2671 } else if (*tail == '\0') {
2672 ret = LogConfiguration::parse_command_line_arguments();
2673 assert(ret, "-Xlog without arguments should never fail to parse");
2674 } else if (*tail == ':') {
2675 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2676 }
2677 if (ret == false) {
2678 jio_fprintf(defaultStream::error_stream(),
2679 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2680 tail);
2681 return JNI_EINVAL;
2682 }
2683 // JNI hooks
2684 } else if (match_option(option, "-Xcheck", &tail)) {
2685 if (!strcmp(tail, ":jni")) {
2686 #if !INCLUDE_JNI_CHECK
2687 warning("JNI CHECKING is not supported in this VM");
2688 #else
2689 CheckJNICalls = true;
2690 #endif // INCLUDE_JNI_CHECK
2691 } else if (is_bad_option(option, args->ignoreUnrecognized,
2692 "check")) {
2693 return JNI_EINVAL;
2694 }
2695 } else if (match_option(option, "vfprintf")) {
2696 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2697 } else if (match_option(option, "exit")) {
2698 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2699 } else if (match_option(option, "abort")) {
2700 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2701 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2702 // and the last option wins.
2703 } else if (match_option(option, "-XX:+NeverTenure")) {
2704 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2708 return JNI_EINVAL;
2709 }
2710 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2711 return JNI_EINVAL;
2712 }
2713 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2714 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2715 return JNI_EINVAL;
2716 }
2717 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2718 return JNI_EINVAL;
2719 }
2720 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2724 uint max_tenuring_thresh = 0;
2725 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2728 return JNI_EINVAL;
2729 }
2730
2731 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734
2735 if (MaxTenuringThreshold == 0) {
2736 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2740 return JNI_EINVAL;
2741 }
2742 } else {
2743 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 }
2750 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2751 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2755 return JNI_EINVAL;
2756 }
2757 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2758 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2759 return JNI_EINVAL;
2760 }
2761 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2765 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2766 return JNI_EINVAL;
2767 }
2768 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2769 return JNI_EINVAL;
2770 }
2771 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2772 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2773 return JNI_EINVAL;
2774 }
2775 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2776 return JNI_EINVAL;
2777 }
2778 } else if (match_option(option, "--finalization=", &tail)) {
2779 if (strcmp(tail, "enabled") == 0) {
2780 InstanceKlass::set_finalization_enabled(true);
2781 } else if (strcmp(tail, "disabled") == 0) {
2782 InstanceKlass::set_finalization_enabled(false);
2783 } else {
2784 jio_fprintf(defaultStream::error_stream(),
2785 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2786 tail);
2787 return JNI_EINVAL;
2788 }
2789 #if !defined(DTRACE_ENABLED)
2790 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2791 jio_fprintf(defaultStream::error_stream(),
2792 "DTraceMethodProbes flag is not applicable for this configuration\n");
2793 return JNI_EINVAL;
2794 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2795 jio_fprintf(defaultStream::error_stream(),
2796 "DTraceAllocProbes flag is not applicable for this configuration\n");
2797 return JNI_EINVAL;
2798 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2799 jio_fprintf(defaultStream::error_stream(),
2800 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2801 return JNI_EINVAL;
2802 #endif // !defined(DTRACE_ENABLED)
2803 #ifdef ASSERT
2804 } else if (match_option(option, "-XX:+FullGCALot")) {
2805 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2806 return JNI_EINVAL;
2807 }
2808 #endif
2809 #if !INCLUDE_MANAGEMENT
2810 } else if (match_option(option, "-XX:+ManagementServer")) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "ManagementServer is not supported in this VM.\n");
2813 return JNI_ERR;
2814 #endif // INCLUDE_MANAGEMENT
2815 #if INCLUDE_JVMCI
2816 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2817 if (EnableJVMCIProduct) {
2818 jio_fprintf(defaultStream::error_stream(),
2819 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2820 return JNI_EINVAL;
2821 }
2822 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2823 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2824 if (use_graal_jit) {
2825 const char* jvmci_compiler = get_property("jvmci.Compiler");
2826 if (jvmci_compiler != nullptr) {
2827 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2830 return JNI_ERR;
2831 }
2832 } else if (!add_property("jvmci.Compiler=graal")) {
2833 return JNI_ENOMEM;
2834 }
2835 }
2836
2837 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2838 if (EnableJVMCIProduct) {
2839 continue;
2840 }
2841 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2842 // Allow this flag if it has been unlocked.
2843 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2844 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2845 jio_fprintf(defaultStream::error_stream(),
2846 "Unable to enable JVMCI in product mode\n");
2847 return JNI_ERR;
2848 }
2849 }
2850 // The flag was locked so process normally to report that error
2851 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2852 return JNI_EINVAL;
2853 }
2854 #endif // INCLUDE_JVMCI
2855 #if INCLUDE_JFR
2856 } else if (match_jfr_option(&option)) {
2857 return JNI_EINVAL;
2858 #endif
2859 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2860 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2861 // already been handled
2862 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2863 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2864 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2865 return JNI_EINVAL;
2866 }
2867 }
2868 // Unknown option
2869 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2870 return JNI_ERR;
2871 }
2872 }
2873
2874 // PrintSharedArchiveAndExit will turn on
2875 // -Xshare:on
2876 // -Xlog:class+path=info
2877 if (PrintSharedArchiveAndExit) {
2878 UseSharedSpaces = true;
2879 RequireSharedSpaces = true;
2880 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2881 }
2882
2883 fix_appclasspath();
2884
2885 return JNI_OK;
2886 }
2887
2888 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2889 if (!allow_cds) {
2890 CDSConfig::set_module_patching_disables_cds();
2891 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2892 CDSConfig::set_java_base_module_patching_disables_cds();
2893 }
2894 }
2895
2896 // Create GrowableArray lazily, only if --patch-module has been specified
2897 if (_patch_mod_prefix == nullptr) {
2898 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2899 }
2900
2901 // Scan patches for matching module
2902 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2903 return (strcmp(module_name, patch->module_name()) == 0);
2904 });
2905 if (i == -1) {
2906 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2907 } else {
2908 if (allow_append) {
2909 // append path to existing module entry
2910 _patch_mod_prefix->at(i)->append_path(path);
2911 } else {
2912 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2913 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2914 } else {
2915 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2916 }
2917 }
2918 }
2919 }
2920
2921 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2922 //
2923 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2924 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2925 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2926 // path is treated as the current directory.
2927 //
2928 // This causes problems with CDS, which requires that all directories specified in the classpath
2929 // must be empty. In most cases, applications do NOT want to load classes from the current
2930 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2931 // scripts compatible with CDS.
2932 void Arguments::fix_appclasspath() {
2933 if (IgnoreEmptyClassPaths) {
2934 const char separator = *os::path_separator();
2935 const char* src = _java_class_path->value();
2936
2937 // skip over all the leading empty paths
2938 while (*src == separator) {
2939 src ++;
2940 }
2941
2942 char* copy = os::strdup_check_oom(src, mtArguments);
2943
2944 // trim all trailing empty paths
2945 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2946 *tail = '\0';
2947 }
2948
2949 char from[3] = {separator, separator, '\0'};
2950 char to [2] = {separator, '\0'};
2951 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2952 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2953 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2954 }
2955
2956 _java_class_path->set_writeable_value(copy);
2957 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2958 }
2959 }
2960
2961 jint Arguments::finalize_vm_init_args() {
2962 // check if the default lib/endorsed directory exists; if so, error
2963 char path[JVM_MAXPATHLEN];
2964 const char* fileSep = os::file_separator();
2965 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2966
2967 DIR* dir = os::opendir(path);
2968 if (dir != nullptr) {
2969 jio_fprintf(defaultStream::output_stream(),
2970 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2971 "in modular form will be supported via the concept of upgradeable modules.\n");
2972 os::closedir(dir);
2973 return JNI_ERR;
2974 }
2975
2976 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2977 dir = os::opendir(path);
2978 if (dir != nullptr) {
2979 jio_fprintf(defaultStream::output_stream(),
2980 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2981 "Use -classpath instead.\n.");
2982 os::closedir(dir);
2983 return JNI_ERR;
2984 }
2985
2986 // This must be done after all arguments have been processed
2987 // and the container support has been initialized since AggressiveHeap
2988 // relies on the amount of total memory available.
2989 if (AggressiveHeap) {
2990 jint result = set_aggressive_heap_flags();
2991 if (result != JNI_OK) {
2992 return result;
2993 }
2994 }
2995
2996 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2997 // but like -Xint, leave compilation thresholds unaffected.
2998 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2999 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3000 set_mode_flags(_int);
3001 }
3002
3003 #ifdef ZERO
3004 // Zero always runs in interpreted mode
3005 set_mode_flags(_int);
3006 #endif
3007
3008 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3009 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3010 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3011 }
3012
3013 #if !COMPILER2_OR_JVMCI
3014 // Don't degrade server performance for footprint
3015 if (FLAG_IS_DEFAULT(UseLargePages) &&
3016 MaxHeapSize < LargePageHeapSizeThreshold) {
3017 // No need for large granularity pages w/small heaps.
3018 // Note that large pages are enabled/disabled for both the
3019 // Java heap and the code cache.
3020 FLAG_SET_DEFAULT(UseLargePages, false);
3021 }
3022
3023 UNSUPPORTED_OPTION(ProfileInterpreter);
3024 #endif
3025
3026 // Parse the CompilationMode flag
3027 if (!CompilationModeFlag::initialize()) {
3028 return JNI_ERR;
3029 }
3030
3031 if (!check_vm_args_consistency()) {
3032 return JNI_ERR;
3033 }
3034
3035 // finalize --module-patch and related --enable-preview
3036 if (finalize_patch_module() != JNI_OK) {
3037 return JNI_ERR;
3038 }
3039
3040 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
3041 return JNI_ERR;
3042 }
3043
3044 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3045 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3046 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3047
3048 return JNI_OK;
3049 }
3050
3051 // Helper class for controlling the lifetime of JavaVMInitArgs
3052 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3053 // deleted on the destruction of the ScopedVMInitArgs object.
3054 class ScopedVMInitArgs : public StackObj {
3055 private:
3056 JavaVMInitArgs _args;
3057 char* _container_name;
3058 bool _is_set;
3059 char* _vm_options_file_arg;
3060
3061 public:
3062 ScopedVMInitArgs(const char *container_name) {
3063 _args.version = JNI_VERSION_1_2;
3064 _args.nOptions = 0;
3065 _args.options = nullptr;
3066 _args.ignoreUnrecognized = false;
3067 _container_name = (char *)container_name;
3068 _is_set = false;
3069 _vm_options_file_arg = nullptr;
3070 }
3071
3072 // Populates the JavaVMInitArgs object represented by this
3073 // ScopedVMInitArgs object with the arguments in options. The
3074 // allocated memory is deleted by the destructor. If this method
3075 // returns anything other than JNI_OK, then this object is in a
3076 // partially constructed state, and should be abandoned.
3077 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3078 _is_set = true;
3079 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3080 JavaVMOption, options->length(), mtArguments);
3081 if (options_arr == nullptr) {
3082 return JNI_ENOMEM;
3083 }
3084 _args.options = options_arr;
3085
3086 for (int i = 0; i < options->length(); i++) {
3087 options_arr[i] = options->at(i);
3088 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3089 if (options_arr[i].optionString == nullptr) {
3090 // Rely on the destructor to do cleanup.
3091 _args.nOptions = i;
3092 return JNI_ENOMEM;
3093 }
3094 }
3095
3096 _args.nOptions = options->length();
3097 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3098 return JNI_OK;
3099 }
3100
3101 JavaVMInitArgs* get() { return &_args; }
3102 char* container_name() { return _container_name; }
3103 bool is_set() { return _is_set; }
3104 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3105 char* vm_options_file_arg() { return _vm_options_file_arg; }
3106
3107 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3108 if (_vm_options_file_arg != nullptr) {
3109 os::free(_vm_options_file_arg);
3110 }
3111 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3112 }
3113
3114 ~ScopedVMInitArgs() {
3115 if (_vm_options_file_arg != nullptr) {
3116 os::free(_vm_options_file_arg);
3117 }
3118 if (_args.options == nullptr) return;
3119 for (int i = 0; i < _args.nOptions; i++) {
3120 os::free(_args.options[i].optionString);
3121 }
3122 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3123 }
3124
3125 // Insert options into this option list, to replace option at
3126 // vm_options_file_pos (-XX:VMOptionsFile)
3127 jint insert(const JavaVMInitArgs* args,
3128 const JavaVMInitArgs* args_to_insert,
3129 const int vm_options_file_pos) {
3130 assert(_args.options == nullptr, "shouldn't be set yet");
3131 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3132 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3133
3134 int length = args->nOptions + args_to_insert->nOptions - 1;
3135 // Construct new option array
3136 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3137 for (int i = 0; i < args->nOptions; i++) {
3138 if (i == vm_options_file_pos) {
3139 // insert the new options starting at the same place as the
3140 // -XX:VMOptionsFile option
3141 for (int j = 0; j < args_to_insert->nOptions; j++) {
3142 options.push(args_to_insert->options[j]);
3143 }
3144 } else {
3145 options.push(args->options[i]);
3146 }
3147 }
3148 // make into options array
3149 return set_args(&options);
3150 }
3151 };
3152
3153 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3154 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3155 }
3156
3157 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3158 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3159 }
3160
3161 jint Arguments::parse_options_environment_variable(const char* name,
3162 ScopedVMInitArgs* vm_args) {
3163 char *buffer = ::getenv(name);
3164
3165 // Don't check this environment variable if user has special privileges
3166 // (e.g. unix su command).
3167 if (buffer == nullptr || os::have_special_privileges()) {
3168 return JNI_OK;
3169 }
3170
3171 if ((buffer = os::strdup(buffer)) == nullptr) {
3172 return JNI_ENOMEM;
3173 }
3174
3175 jio_fprintf(defaultStream::error_stream(),
3176 "Picked up %s: %s\n", name, buffer);
3177
3178 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3179
3180 os::free(buffer);
3181 return retcode;
3182 }
3183
3184 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3185 // read file into buffer
3186 int fd = ::open(file_name, O_RDONLY);
3187 if (fd < 0) {
3188 jio_fprintf(defaultStream::error_stream(),
3189 "Could not open options file '%s'\n",
3190 file_name);
3191 return JNI_ERR;
3192 }
3193
3194 struct stat stbuf;
3195 int retcode = os::stat(file_name, &stbuf);
3196 if (retcode != 0) {
3197 jio_fprintf(defaultStream::error_stream(),
3198 "Could not stat options file '%s'\n",
3199 file_name);
3200 ::close(fd);
3201 return JNI_ERR;
3202 }
3203
3204 if (stbuf.st_size == 0) {
3205 // tell caller there is no option data and that is ok
3206 ::close(fd);
3207 return JNI_OK;
3208 }
3209
3210 // '+ 1' for null termination even with max bytes
3211 size_t bytes_alloc = stbuf.st_size + 1;
3212
3213 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3214 if (nullptr == buf) {
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Could not allocate read buffer for options file parse\n");
3217 ::close(fd);
3218 return JNI_ENOMEM;
3219 }
3220
3221 memset(buf, 0, bytes_alloc);
3222
3223 // Fill buffer
3224 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3225 ::close(fd);
3226 if (bytes_read < 0) {
3227 FREE_C_HEAP_ARRAY(char, buf);
3228 jio_fprintf(defaultStream::error_stream(),
3229 "Could not read options file '%s'\n", file_name);
3230 return JNI_ERR;
3231 }
3232
3233 if (bytes_read == 0) {
3234 // tell caller there is no option data and that is ok
3235 FREE_C_HEAP_ARRAY(char, buf);
3236 return JNI_OK;
3237 }
3238
3239 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3240
3241 FREE_C_HEAP_ARRAY(char, buf);
3242 return retcode;
3243 }
3244
3245 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3246 // Construct option array
3247 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3248
3249 // some pointers to help with parsing
3250 char *buffer_end = buffer + buf_len;
3251 char *opt_hd = buffer;
3252 char *wrt = buffer;
3253 char *rd = buffer;
3254
3255 // parse all options
3256 while (rd < buffer_end) {
3257 // skip leading white space from the input string
3258 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3259 rd++;
3260 }
3261
3262 if (rd >= buffer_end) {
3263 break;
3264 }
3265
3266 // Remember this is where we found the head of the token.
3267 opt_hd = wrt;
3268
3269 // Tokens are strings of non white space characters separated
3270 // by one or more white spaces.
3271 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3272 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3273 int quote = *rd; // matching quote to look for
3274 rd++; // don't copy open quote
3275 while (rd < buffer_end && *rd != quote) {
3276 // include everything (even spaces)
3277 // up until the close quote
3278 *wrt++ = *rd++; // copy to option string
3279 }
3280
3281 if (rd < buffer_end) {
3282 rd++; // don't copy close quote
3283 } else {
3284 // did not see closing quote
3285 jio_fprintf(defaultStream::error_stream(),
3286 "Unmatched quote in %s\n", name);
3287 return JNI_ERR;
3288 }
3289 } else {
3290 *wrt++ = *rd++; // copy to option string
3291 }
3292 }
3293
3294 // steal a white space character and set it to null
3295 *wrt++ = '\0';
3296 // We now have a complete token
3297
3298 JavaVMOption option;
3299 option.optionString = opt_hd;
3300 option.extraInfo = nullptr;
3301
3302 options.append(option); // Fill in option
3303
3304 rd++; // Advance to next character
3305 }
3306
3307 // Fill out JavaVMInitArgs structure.
3308 return vm_args->set_args(&options);
3309 }
3310
3311 #ifndef PRODUCT
3312 // Determine whether LogVMOutput should be implicitly turned on.
3313 static bool use_vm_log() {
3314 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3315 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3316 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3317 PrintAssembly || TraceDeoptimization ||
3318 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3319 return true;
3320 }
3321
3322 #ifdef COMPILER1
3323 if (PrintC1Statistics) {
3324 return true;
3325 }
3326 #endif // COMPILER1
3327
3328 #ifdef COMPILER2
3329 if (PrintOptoAssembly || PrintOptoStatistics) {
3330 return true;
3331 }
3332 #endif // COMPILER2
3333
3334 return false;
3335 }
3336
3337 #endif // PRODUCT
3338
3339 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3340 for (int index = 0; index < args->nOptions; index++) {
3341 const JavaVMOption* option = args->options + index;
3342 const char* tail;
3343 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3344 return true;
3345 }
3346 }
3347 return false;
3348 }
3349
3350 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3351 const char* vm_options_file,
3352 const int vm_options_file_pos,
3353 ScopedVMInitArgs* vm_options_file_args,
3354 ScopedVMInitArgs* args_out) {
3355 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3356 if (code != JNI_OK) {
3357 return code;
3358 }
3359
3360 if (vm_options_file_args->get()->nOptions < 1) {
3361 return JNI_OK;
3362 }
3363
3364 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3365 jio_fprintf(defaultStream::error_stream(),
3366 "A VM options file may not refer to a VM options file. "
3367 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3368 "options file '%s' in options container '%s' is an error.\n",
3369 vm_options_file_args->vm_options_file_arg(),
3370 vm_options_file_args->container_name());
3371 return JNI_EINVAL;
3372 }
3373
3374 return args_out->insert(args, vm_options_file_args->get(),
3375 vm_options_file_pos);
3376 }
3377
3378 // Expand -XX:VMOptionsFile found in args_in as needed.
3379 // mod_args and args_out parameters may return values as needed.
3380 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3381 ScopedVMInitArgs* mod_args,
3382 JavaVMInitArgs** args_out) {
3383 jint code = match_special_option_and_act(args_in, mod_args);
3384 if (code != JNI_OK) {
3385 return code;
3386 }
3387
3388 if (mod_args->is_set()) {
3389 // args_in contains -XX:VMOptionsFile and mod_args contains the
3390 // original options from args_in along with the options expanded
3391 // from the VMOptionsFile. Return a short-hand to the caller.
3392 *args_out = mod_args->get();
3393 } else {
3394 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3395 }
3396 return JNI_OK;
3397 }
3398
3399 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3400 ScopedVMInitArgs* args_out) {
3401 // Remaining part of option string
3402 const char* tail;
3403 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3404
3405 for (int index = 0; index < args->nOptions; index++) {
3406 const JavaVMOption* option = args->options + index;
3407 if (match_option(option, "-XX:Flags=", &tail)) {
3408 Arguments::set_jvm_flags_file(tail);
3409 continue;
3410 }
3411 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3412 if (vm_options_file_args.found_vm_options_file_arg()) {
3413 jio_fprintf(defaultStream::error_stream(),
3414 "The option '%s' is already specified in the options "
3415 "container '%s' so the specification of '%s' in the "
3416 "same options container is an error.\n",
3417 vm_options_file_args.vm_options_file_arg(),
3418 vm_options_file_args.container_name(),
3419 option->optionString);
3420 return JNI_EINVAL;
3421 }
3422 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3423 // If there's a VMOptionsFile, parse that
3424 jint code = insert_vm_options_file(args, tail, index,
3425 &vm_options_file_args, args_out);
3426 if (code != JNI_OK) {
3427 return code;
3428 }
3429 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3430 if (args_out->is_set()) {
3431 // The VMOptions file inserted some options so switch 'args'
3432 // to the new set of options, and continue processing which
3433 // preserves "last option wins" semantics.
3434 args = args_out->get();
3435 // The first option from the VMOptionsFile replaces the
3436 // current option. So we back track to process the
3437 // replacement option.
3438 index--;
3439 }
3440 continue;
3441 }
3442 if (match_option(option, "-XX:+PrintVMOptions")) {
3443 PrintVMOptions = true;
3444 continue;
3445 }
3446 if (match_option(option, "-XX:-PrintVMOptions")) {
3447 PrintVMOptions = false;
3448 continue;
3449 }
3450 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3451 IgnoreUnrecognizedVMOptions = true;
3452 continue;
3453 }
3454 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3455 IgnoreUnrecognizedVMOptions = false;
3456 continue;
3457 }
3458 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3459 JVMFlag::printFlags(tty, false);
3460 vm_exit(0);
3461 }
3462
3463 #ifndef PRODUCT
3464 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3465 JVMFlag::printFlags(tty, true);
3466 vm_exit(0);
3467 }
3468 #endif
3469 }
3470 return JNI_OK;
3471 }
3472
3473 static void print_options(const JavaVMInitArgs *args) {
3474 const char* tail;
3475 for (int index = 0; index < args->nOptions; index++) {
3476 const JavaVMOption *option = args->options + index;
3477 if (match_option(option, "-XX:", &tail)) {
3478 logOption(tail);
3479 }
3480 }
3481 }
3482
3483 bool Arguments::handle_deprecated_print_gc_flags() {
3484 if (PrintGC) {
3485 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3486 }
3487 if (PrintGCDetails) {
3488 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3489 }
3490
3491 if (_legacyGCLogging.lastFlag == 2) {
3492 // -Xloggc was used to specify a filename
3493 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3494
3495 LogTarget(Error, logging) target;
3496 LogStream errstream(target);
3497 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3498 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3499 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3500 }
3501 return true;
3502 }
3503
3504 static void apply_debugger_ergo() {
3505 #ifdef ASSERT
3506 if (ReplayCompiles) {
3507 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3508 }
3509
3510 if (UseDebuggerErgo) {
3511 // Turn on sub-flags
3512 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3513 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3514 }
3515
3516 if (UseDebuggerErgo2) {
3517 // Debugging with limited number of CPUs
3518 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3519 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3520 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3521 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3522 }
3523 #endif // ASSERT
3524 }
3525
3526 // Parse entry point called from JNI_CreateJavaVM
3527
3528 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3529 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3530 JVMFlag::check_all_flag_declarations();
3531
3532 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3533 const char* hotspotrc = ".hotspotrc";
3534 bool settings_file_specified = false;
3535 bool needs_hotspotrc_warning = false;
3536 ScopedVMInitArgs initial_vm_options_args("");
3537 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3538 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3539
3540 // Pointers to current working set of containers
3541 JavaVMInitArgs* cur_cmd_args;
3542 JavaVMInitArgs* cur_vm_options_args;
3543 JavaVMInitArgs* cur_java_options_args;
3544 JavaVMInitArgs* cur_java_tool_options_args;
3545
3546 // Containers for modified/expanded options
3547 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3548 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3549 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3550 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3551
3552
3553 jint code =
3554 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3555 if (code != JNI_OK) {
3556 return code;
3557 }
3558
3559 code = parse_java_options_environment_variable(&initial_java_options_args);
3560 if (code != JNI_OK) {
3561 return code;
3562 }
3563
3564 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3565 char *vmoptions = ClassLoader::lookup_vm_options();
3566 if (vmoptions != nullptr) {
3567 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3568 FREE_C_HEAP_ARRAY(char, vmoptions);
3569 if (code != JNI_OK) {
3570 return code;
3571 }
3572 }
3573
3574 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3575 &mod_java_tool_options_args,
3576 &cur_java_tool_options_args);
3577 if (code != JNI_OK) {
3578 return code;
3579 }
3580
3581 code = expand_vm_options_as_needed(initial_cmd_args,
3582 &mod_cmd_args,
3583 &cur_cmd_args);
3584 if (code != JNI_OK) {
3585 return code;
3586 }
3587
3588 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3589 &mod_java_options_args,
3590 &cur_java_options_args);
3591 if (code != JNI_OK) {
3592 return code;
3593 }
3594
3595 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3596 &mod_vm_options_args,
3597 &cur_vm_options_args);
3598 if (code != JNI_OK) {
3599 return code;
3600 }
3601
3602 const char* flags_file = Arguments::get_jvm_flags_file();
3603 settings_file_specified = (flags_file != nullptr);
3604
3605 if (IgnoreUnrecognizedVMOptions) {
3606 cur_cmd_args->ignoreUnrecognized = true;
3607 cur_java_tool_options_args->ignoreUnrecognized = true;
3608 cur_java_options_args->ignoreUnrecognized = true;
3609 }
3610
3611 // Parse specified settings file
3612 if (settings_file_specified) {
3613 if (!process_settings_file(flags_file, true,
3614 cur_cmd_args->ignoreUnrecognized)) {
3615 return JNI_EINVAL;
3616 }
3617 } else {
3618 #ifdef ASSERT
3619 // Parse default .hotspotrc settings file
3620 if (!process_settings_file(".hotspotrc", false,
3621 cur_cmd_args->ignoreUnrecognized)) {
3622 return JNI_EINVAL;
3623 }
3624 #else
3625 struct stat buf;
3626 if (os::stat(hotspotrc, &buf) == 0) {
3627 needs_hotspotrc_warning = true;
3628 }
3629 #endif
3630 }
3631
3632 if (PrintVMOptions) {
3633 print_options(cur_java_tool_options_args);
3634 print_options(cur_cmd_args);
3635 print_options(cur_java_options_args);
3636 }
3637
3638 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3639 jint result = parse_vm_init_args(cur_vm_options_args,
3640 cur_java_tool_options_args,
3641 cur_java_options_args,
3642 cur_cmd_args);
3643
3644 if (result != JNI_OK) {
3645 return result;
3646 }
3647
3648 // Delay warning until here so that we've had a chance to process
3649 // the -XX:-PrintWarnings flag
3650 if (needs_hotspotrc_warning) {
3651 warning("%s file is present but has been ignored. "
3652 "Run with -XX:Flags=%s to load the file.",
3653 hotspotrc, hotspotrc);
3654 }
3655
3656 if (needs_module_property_warning) {
3657 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3658 " names that are reserved for internal use.");
3659 }
3660
3661 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3662 UNSUPPORTED_OPTION(UseLargePages);
3663 #endif
3664
3665 #if defined(AIX)
3666 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3667 #endif
3668
3669 #ifndef PRODUCT
3670 if (TraceBytecodesAt != 0) {
3671 TraceBytecodes = true;
3672 }
3673 #endif // PRODUCT
3674
3675 if (ScavengeRootsInCode == 0) {
3676 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3677 warning("Forcing ScavengeRootsInCode non-zero");
3678 }
3679 ScavengeRootsInCode = 1;
3680 }
3681
3682 if (!handle_deprecated_print_gc_flags()) {
3683 return JNI_EINVAL;
3684 }
3685
3686 // Set object alignment values.
3687 set_object_alignment();
3688
3689 #if !INCLUDE_CDS
3690 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3691 jio_fprintf(defaultStream::error_stream(),
3692 "Shared spaces are not supported in this VM\n");
3693 return JNI_ERR;
3694 }
3695 if (DumpLoadedClassList != nullptr) {
3696 jio_fprintf(defaultStream::error_stream(),
3697 "DumpLoadedClassList is not supported in this VM\n");
3698 return JNI_ERR;
3699 }
3700 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3701 log_is_enabled(Info, cds)) {
3702 warning("Shared spaces are not supported in this VM");
3703 UseSharedSpaces = false;
3704 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3705 }
3706 no_shared_spaces("CDS Disabled");
3707 #endif // INCLUDE_CDS
3708
3709 // Verify NMT arguments
3710 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3711 if (lvl == NMT_unknown) {
3712 jio_fprintf(defaultStream::error_stream(),
3713 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3714 return JNI_ERR;
3715 }
3716 if (PrintNMTStatistics && lvl == NMT_off) {
3717 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3718 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3719 }
3720
3721 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3722 if (trace_dependencies && VerifyDependencies) {
3723 warning("dependency logging results may be inflated by VerifyDependencies");
3724 }
3725
3726 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3727 log_is_enabled(Info, class, load, cause);
3728 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3729 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3730 }
3731
3732 apply_debugger_ergo();
3733
3734 // The VMThread needs to stop now and then to execute these debug options.
3735 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3736 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3737 }
3738
3739 if (log_is_enabled(Info, arguments)) {
3740 LogStream st(Log(arguments)::info());
3741 Arguments::print_on(&st);
3742 }
3743
3744 return JNI_OK;
3745 }
3746
3747 jint Arguments::apply_ergo() {
3748 // Set flags based on ergonomics.
3749 jint result = set_ergonomics_flags();
3750 if (result != JNI_OK) return result;
3751
3752 // Set heap size based on available physical memory
3753 set_heap_size();
3754
3755 GCConfig::arguments()->initialize();
3756
3757 CDSConfig::initialize();
3758
3759 // Initialize Metaspace flags and alignments
3760 Metaspace::ergo_initialize();
3761
3762 if (!StringDedup::ergo_initialize()) {
3763 return JNI_EINVAL;
3764 }
3765
3766 // Set compiler flags after GC is selected and GC specific
3767 // flags (LoopStripMiningIter) are set.
3768 CompilerConfig::ergo_initialize();
3769
3770 // Set bytecode rewriting flags
3771 set_bytecode_flags();
3772
3773 // Set flags if aggressive optimization flags are enabled
3774 jint code = set_aggressive_opts_flags();
3775 if (code != JNI_OK) {
3776 return code;
3777 }
3778
3779 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3780 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3781 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3782 warning("UseSecondarySupersTable is not supported");
3783 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3784 }
3785 if (!UseSecondarySupersTable) {
3786 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3787 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3788 }
3789
3790 #ifdef ZERO
3791 // Clear flags not supported on zero.
3792 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3793 #endif // ZERO
3794
3795 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3796 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3797 DebugNonSafepoints = true;
3798 }
3799
3800 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3801 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3802 }
3803
3804 // Treat the odd case where local verification is enabled but remote
3805 // verification is not as if both were enabled.
3806 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3807 log_info(verification)("Turning on remote verification because local verification is on");
3808 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3809 }
3810 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3811 // Disable calling convention optimizations if inline types are not supported.
3812 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3813 // the CDS archive, as the values must match between dumptime and runtime.
3814 InlineTypePassFieldsAsArgs = false;
3815 InlineTypeReturnedAsFields = false;
3816 }
3817
3818 #ifndef PRODUCT
3819 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3820 if (use_vm_log()) {
3821 LogVMOutput = true;
3822 }
3823 }
3824 #endif // PRODUCT
3825
3826 if (PrintCommandLineFlags) {
3827 JVMFlag::printSetFlags(tty);
3828 }
3829
3830 #if COMPILER2_OR_JVMCI
3831 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3832 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3833 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3834 }
3835 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3836
3837 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3838 if (!EnableVectorReboxing) {
3839 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3840 } else {
3841 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3842 }
3843 }
3844 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3845
3846 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3847 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3848 }
3849 FLAG_SET_DEFAULT(UseVectorStubs, false);
3850 }
3851 #endif // COMPILER2_OR_JVMCI
3852
3853 if (log_is_enabled(Info, perf, class, link)) {
3854 if (!UsePerfData) {
3855 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3856 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3857 }
3858 }
3859
3860 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3861 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3862 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3863 }
3864 }
3865 return JNI_OK;
3866 }
3867
3868 jint Arguments::adjust_after_os() {
3869 if (UseNUMA) {
3870 if (UseParallelGC) {
3871 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3872 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3873 }
3874 }
3875 }
3876 return JNI_OK;
3877 }
3878
3879 int Arguments::PropertyList_count(SystemProperty* pl) {
3880 int count = 0;
3881 while(pl != nullptr) {
3882 count++;
3883 pl = pl->next();
3884 }
3885 return count;
3886 }
3887
3888 // Return the number of readable properties.
3889 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3890 int count = 0;
3891 while(pl != nullptr) {
3892 if (pl->readable()) {
3893 count++;
3894 }
3895 pl = pl->next();
3896 }
3897 return count;
3898 }
3899
3900 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3901 assert(key != nullptr, "just checking");
3902 SystemProperty* prop;
3903 for (prop = pl; prop != nullptr; prop = prop->next()) {
3904 if (strcmp(key, prop->key()) == 0) return prop->value();
3905 }
3906 return nullptr;
3907 }
3908
3909 // Return the value of the requested property provided that it is a readable property.
3910 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3911 assert(key != nullptr, "just checking");
3912 SystemProperty* prop;
3913 // Return the property value if the keys match and the property is not internal or
3914 // it's the special internal property "jdk.boot.class.path.append".
3915 for (prop = pl; prop != nullptr; prop = prop->next()) {
3916 if (strcmp(key, prop->key()) == 0) {
3917 if (!prop->internal()) {
3918 return prop->value();
3919 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3920 return prop->value();
3921 } else {
3922 // Property is internal and not jdk.boot.class.path.append so return null.
3923 return nullptr;
3924 }
3925 }
3926 }
3927 return nullptr;
3928 }
3929
3930 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3931 SystemProperty* p = *plist;
3932 if (p == nullptr) {
3933 *plist = new_p;
3934 } else {
3935 while (p->next() != nullptr) {
3936 p = p->next();
3937 }
3938 p->set_next(new_p);
3939 }
3940 }
3941
3942 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3943 bool writeable, bool internal) {
3944 if (plist == nullptr)
3945 return;
3946
3947 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3948 PropertyList_add(plist, new_p);
3949 }
3950
3951 void Arguments::PropertyList_add(SystemProperty *element) {
3952 PropertyList_add(&_system_properties, element);
3953 }
3954
3955 // This add maintains unique property key in the list.
3956 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3957 PropertyAppendable append, PropertyWriteable writeable,
3958 PropertyInternal internal) {
3959 if (plist == nullptr)
3960 return;
3961
3962 // If property key exists and is writeable, then update with new value.
3963 // Trying to update a non-writeable property is silently ignored.
3964 SystemProperty* prop;
3965 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3966 if (strcmp(k, prop->key()) == 0) {
3967 if (append == AppendProperty) {
3968 prop->append_writeable_value(v);
3969 } else {
3970 prop->set_writeable_value(v);
3971 }
3972 return;
3973 }
3974 }
3975
3976 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3977 }
3978
3979 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3980 // Returns true if all of the source pointed by src has been copied over to
3981 // the destination buffer pointed by buf. Otherwise, returns false.
3982 // Notes:
3983 // 1. If the length (buflen) of the destination buffer excluding the
3984 // null terminator character is not long enough for holding the expanded
3985 // pid characters, it also returns false instead of returning the partially
3986 // expanded one.
3987 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3988 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3989 char* buf, size_t buflen) {
3990 const char* p = src;
3991 char* b = buf;
3992 const char* src_end = &src[srclen];
3993 char* buf_end = &buf[buflen - 1];
3994
3995 while (p < src_end && b < buf_end) {
3996 if (*p == '%') {
3997 switch (*(++p)) {
3998 case '%': // "%%" ==> "%"
3999 *b++ = *p++;
4000 break;
4001 case 'p': { // "%p" ==> current process id
4002 // buf_end points to the character before the last character so
4003 // that we could write '\0' to the end of the buffer.
4004 size_t buf_sz = buf_end - b + 1;
4005 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4006
4007 // if jio_snprintf fails or the buffer is not long enough to hold
4008 // the expanded pid, returns false.
4009 if (ret < 0 || ret >= (int)buf_sz) {
4010 return false;
4011 } else {
4012 b += ret;
4013 assert(*b == '\0', "fail in copy_expand_pid");
4014 if (p == src_end && b == buf_end + 1) {
4015 // reach the end of the buffer.
4016 return true;
4017 }
4018 }
4019 p++;
4020 break;
4021 }
4022 default :
4023 *b++ = '%';
4024 }
4025 } else {
4026 *b++ = *p++;
4027 }
4028 }
4029 *b = '\0';
4030 return (p == src_end); // return false if not all of the source was copied
4031 }