1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/moduleEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "gc/shared/collectorPolicy.hpp"
33 #include "gc/shared/gcArguments.hpp"
34 #include "gc/shared/gcConfig.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "logging/logStream.hpp"
38 #include "logging/logTag.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/flags/jvmFlag.hpp"
45 #include "runtime/flags/jvmFlagConstraintList.hpp"
46 #include "runtime/flags/jvmFlagWriteableList.hpp"
47 #include "runtime/flags/jvmFlagRangeList.hpp"
48 #include "runtime/globals_extension.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/os.inline.hpp"
51 #include "runtime/safepoint.hpp"
52 #include "runtime/safepointMechanism.hpp"
53 #include "runtime/vm_version.hpp"
54 #include "services/management.hpp"
55 #include "services/memTracker.hpp"
56 #include "utilities/align.hpp"
57 #include "utilities/defaultStream.hpp"
58 #include "utilities/macros.hpp"
59 #include "utilities/stringUtils.hpp"
60 #if INCLUDE_JVMCI
61 #include "jvmci/jvmciRuntime.hpp"
62 #endif
63 #if INCLUDE_JFR
64 #include "jfr/jfr.hpp"
65 #endif
66
67 // Note: This is a special bug reporting site for the JVM
68 #ifdef VENDOR_URL_VM_BUG
69 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
70 #else
71 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
72 #endif
73 #define DEFAULT_JAVA_LAUNCHER "generic"
74
75 char* Arguments::_jvm_flags_file = NULL;
76 char** Arguments::_jvm_flags_array = NULL;
77 int Arguments::_num_jvm_flags = 0;
78 char** Arguments::_jvm_args_array = NULL;
79 int Arguments::_num_jvm_args = 0;
80 char* Arguments::_java_command = NULL;
81 SystemProperty* Arguments::_system_properties = NULL;
82 const char* Arguments::_gc_log_filename = NULL;
83 size_t Arguments::_conservative_max_heap_alignment = 0;
84 size_t Arguments::_min_heap_size = 0;
85 Arguments::Mode Arguments::_mode = _mixed;
86 bool Arguments::_java_compiler = false;
87 bool Arguments::_xdebug_mode = false;
88 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
89 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
90 int Arguments::_sun_java_launcher_pid = -1;
91 bool Arguments::_sun_java_launcher_is_altjvm = false;
92
93 // These parameters are reset in method parse_vm_init_args()
94 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
95 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
96 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
97 bool Arguments::_ClipInlining = ClipInlining;
98 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
99 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
100
101 bool Arguments::_enable_preview = false;
102
103 char* Arguments::SharedArchivePath = NULL;
104
105 AgentLibraryList Arguments::_libraryList;
106 AgentLibraryList Arguments::_agentList;
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 = NULL;
112 exit_hook_t Arguments::_exit_hook = NULL;
113 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
114
115
116 SystemProperty *Arguments::_sun_boot_library_path = NULL;
117 SystemProperty *Arguments::_java_library_path = NULL;
118 SystemProperty *Arguments::_java_home = NULL;
119 SystemProperty *Arguments::_java_class_path = NULL;
120 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
121 SystemProperty *Arguments::_vm_info = NULL;
122
123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
124 PathString *Arguments::_system_boot_class_path = NULL;
125 bool Arguments::_has_jimage = false;
126
127 char* Arguments::_ext_dirs = NULL;
128
129 bool PathString::set_value(const char *value) {
130 if (_value != NULL) {
131 FreeHeap(_value);
132 }
133 _value = AllocateHeap(strlen(value)+1, mtArguments);
134 assert(_value != NULL, "Unable to allocate space for new path value");
135 if (_value != NULL) {
136 strcpy(_value, value);
137 } else {
138 // not able to allocate
139 return false;
140 }
141 return true;
142 }
143
144 void PathString::append_value(const char *value) {
145 char *sp;
146 size_t len = 0;
147 if (value != NULL) {
148 len = strlen(value);
149 if (_value != NULL) {
150 len += strlen(_value);
151 }
152 sp = AllocateHeap(len+2, mtArguments);
153 assert(sp != NULL, "Unable to allocate space for new append path value");
154 if (sp != NULL) {
155 if (_value != NULL) {
156 strcpy(sp, _value);
157 strcat(sp, os::path_separator());
158 strcat(sp, value);
159 FreeHeap(_value);
160 } else {
161 strcpy(sp, value);
162 }
163 _value = sp;
164 }
165 }
166 }
167
168 PathString::PathString(const char* value) {
169 if (value == NULL) {
170 _value = NULL;
171 } else {
172 _value = AllocateHeap(strlen(value)+1, mtArguments);
173 strcpy(_value, value);
174 }
175 }
176
177 PathString::~PathString() {
178 if (_value != NULL) {
179 FreeHeap(_value);
180 _value = NULL;
181 }
182 }
183
184 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
185 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
186 size_t len = strlen(module_name) + 1;
187 _module_name = AllocateHeap(len, mtInternal);
188 strncpy(_module_name, module_name, len); // copy the trailing null
189 _path = new PathString(path);
190 }
191
192 ModulePatchPath::~ModulePatchPath() {
193 if (_module_name != NULL) {
194 FreeHeap(_module_name);
195 _module_name = NULL;
196 }
197 if (_path != NULL) {
198 delete _path;
199 _path = NULL;
200 }
201 }
202
203 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
204 if (key == NULL) {
205 _key = NULL;
206 } else {
207 _key = AllocateHeap(strlen(key)+1, mtArguments);
208 strcpy(_key, key);
209 }
210 _next = NULL;
211 _internal = internal;
212 _writeable = writeable;
213 }
214
215 AgentLibrary::AgentLibrary(const char* name, const char* options,
216 bool is_absolute_path, void* os_lib,
217 bool instrument_lib) {
218 _name = AllocateHeap(strlen(name)+1, mtArguments);
219 strcpy(_name, name);
220 if (options == NULL) {
221 _options = NULL;
222 } else {
223 _options = AllocateHeap(strlen(options)+1, mtArguments);
224 strcpy(_options, options);
225 }
226 _is_absolute_path = is_absolute_path;
227 _os_lib = os_lib;
228 _next = NULL;
229 _state = agent_invalid;
230 _is_static_lib = false;
231 _is_instrument_lib = instrument_lib;
232 }
233
234 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
235 // part of the option string.
236 static bool match_option(const JavaVMOption *option, const char* name,
237 const char** tail) {
238 size_t len = strlen(name);
239 if (strncmp(option->optionString, name, len) == 0) {
240 *tail = option->optionString + len;
241 return true;
242 } else {
243 return false;
244 }
245 }
246
247 // Check if 'option' matches 'name'. No "tail" is allowed.
248 static bool match_option(const JavaVMOption *option, const char* name) {
249 const char* tail = NULL;
250 bool result = match_option(option, name, &tail);
251 if (tail != NULL && *tail == '\0') {
252 return result;
253 } else {
254 return false;
255 }
256 }
257
258 // Return true if any of the strings in null-terminated array 'names' matches.
259 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
260 // the option must match exactly.
261 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
262 bool tail_allowed) {
263 for (/* empty */; *names != NULL; ++names) {
264 if (match_option(option, *names, tail)) {
265 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
266 return true;
267 }
268 }
269 }
270 return false;
271 }
272
273 #if INCLUDE_JFR
274 // return true on failure
275 static bool match_jfr_option(const JavaVMOption** option) {
276 assert((*option)->optionString != NULL, "invariant");
277 char* tail = NULL;
278 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
279 return Jfr::on_start_flight_recording_option(option, tail);
280 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284 }
285 #endif
286
287 static void logOption(const char* opt) {
288 if (PrintVMOptions) {
289 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
290 }
291 }
292
293 bool needs_module_property_warning = false;
294
295 #define MODULE_PROPERTY_PREFIX "jdk.module."
296 #define MODULE_PROPERTY_PREFIX_LEN 11
297 #define ADDEXPORTS "addexports"
298 #define ADDEXPORTS_LEN 10
299 #define ADDREADS "addreads"
300 #define ADDREADS_LEN 8
301 #define ADDOPENS "addopens"
302 #define ADDOPENS_LEN 8
303 #define PATCH "patch"
304 #define PATCH_LEN 5
305 #define ADDMODS "addmods"
306 #define ADDMODS_LEN 7
307 #define LIMITMODS "limitmods"
308 #define LIMITMODS_LEN 9
309 #define PATH "path"
310 #define PATH_LEN 4
311 #define UPGRADE_PATH "upgrade.path"
312 #define UPGRADE_PATH_LEN 12
313
314 void Arguments::add_init_library(const char* name, char* options) {
315 _libraryList.add(new AgentLibrary(name, options, false, NULL));
316 }
317
318 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
319 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
320 }
321
322 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
323 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
324 }
325
326 // Late-binding agents not started via arguments
327 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
328 _agentList.add(agentLib);
329 }
330
331 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
332 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
333 return ((strncmp(option, property, len) == 0) &&
334 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
335 }
336
337 // Return true if property starts with "jdk.module." and its ensuing chars match
338 // any of the reserved module properties.
339 // property should be passed without the leading "-D".
340 bool Arguments::is_internal_module_property(const char* property) {
341 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
342 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
343 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
344 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
345 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
346 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
347 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
348 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
349 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
350 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
351 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
352 return true;
353 }
354 }
355 return false;
356 }
357
358 // Process java launcher properties.
359 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
360 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
361 // sun.java.launcher.pid is defined.
362 // Must do this before setting up other system properties,
363 // as some of them may depend on launcher type.
364 for (int index = 0; index < args->nOptions; index++) {
365 const JavaVMOption* option = args->options + index;
366 const char* tail;
367
368 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
369 process_java_launcher_argument(tail, option->extraInfo);
370 continue;
371 }
372 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
373 if (strcmp(tail, "true") == 0) {
374 _sun_java_launcher_is_altjvm = true;
375 }
376 continue;
377 }
378 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
379 _sun_java_launcher_pid = atoi(tail);
380 continue;
381 }
382 }
383 }
384
385 // Initialize system properties key and value.
386 void Arguments::init_system_properties() {
387
388 // Set up _system_boot_class_path which is not a property but
389 // relies heavily on argument processing and the jdk.boot.class.path.append
390 // property. It is used to store the underlying system boot class path.
391 _system_boot_class_path = new PathString(NULL);
392
393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
394 "Java Virtual Machine Specification", false));
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
397 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
398
399 // Initialize the vm.info now, but it will need updating after argument parsing.
400 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
401
402 // Following are JVMTI agent writable properties.
403 // Properties values are set to NULL and they are
404 // os specific they are initialized in os::init_system_properties_values().
405 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
406 _java_library_path = new SystemProperty("java.library.path", NULL, true);
407 _java_home = new SystemProperty("java.home", NULL, true);
408 _java_class_path = new SystemProperty("java.class.path", "", true);
409 // jdk.boot.class.path.append is a non-writeable, internal property.
410 // It can only be set by either:
411 // - -Xbootclasspath/a:
412 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
413 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
414
415 // Add to System Property list.
416 PropertyList_add(&_system_properties, _sun_boot_library_path);
417 PropertyList_add(&_system_properties, _java_library_path);
418 PropertyList_add(&_system_properties, _java_home);
419 PropertyList_add(&_system_properties, _java_class_path);
420 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
421 PropertyList_add(&_system_properties, _vm_info);
422
423 // Set OS specific system properties values
424 os::init_system_properties_values();
425 }
426
427 // Update/Initialize System properties after JDK version number is known
428 void Arguments::init_version_specific_system_properties() {
429 enum { bufsz = 16 };
430 char buffer[bufsz];
431 const char* spec_vendor = "Oracle Corporation";
432 uint32_t spec_version = JDK_Version::current().major_version();
433
434 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
435
436 PropertyList_add(&_system_properties,
437 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.version", buffer, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
442 }
443
444 /*
445 * -XX argument processing:
446 *
447 * -XX arguments are defined in several places, such as:
448 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
449 * -XX arguments are parsed in parse_argument().
450 * -XX argument bounds checking is done in check_vm_args_consistency().
451 *
452 * Over time -XX arguments may change. There are mechanisms to handle common cases:
453 *
454 * ALIASED: An option that is simply another name for another option. This is often
455 * part of the process of deprecating a flag, but not all aliases need
456 * to be deprecated.
457 *
458 * Create an alias for an option by adding the old and new option names to the
459 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
460 *
461 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
462 * support may be removed in the future. Both regular and aliased options may be
463 * deprecated.
464 *
465 * Add a deprecation warning for an option (or alias) by adding an entry in the
466 * "special_jvm_flags" table and setting the "deprecated_in" field.
467 * Often an option "deprecated" in one major release will
468 * be made "obsolete" in the next. In this case the entry should also have its
469 * "obsolete_in" field set.
470 *
471 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
472 * on the command line. A warning is printed to let the user know that option might not
473 * be accepted in the future.
474 *
475 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
476 * table and setting the "obsolete_in" field.
477 *
478 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
479 * to the current JDK version. The system will flatly refuse to admit the existence of
480 * the flag. This allows a flag to die automatically over JDK releases.
481 *
482 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
483 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
484 * - Newly obsolete or expired deprecated options should have their global variable
485 * definitions removed (from globals.hpp, etc) and related implementations removed.
486 *
487 * Recommended approach for removing options:
488 *
489 * To remove options commonly used by customers (e.g. product -XX options), use
490 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
491 *
492 * To remove internal options (e.g. diagnostic, experimental, develop options), use
493 * a 2-step model adding major release numbers to the obsolete and expire columns.
494 *
495 * To change the name of an option, use the alias table as well as a 2-step
496 * model adding major release numbers to the deprecate and expire columns.
497 * Think twice about aliasing commonly used customer options.
498 *
499 * There are times when it is appropriate to leave a future release number as undefined.
500 *
501 * Tests: Aliases should be tested in VMAliasOptions.java.
502 * Deprecated options should be tested in VMDeprecatedOptions.java.
503 */
504
505 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
506 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
507 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
508 // the command-line as usual, but will issue a warning.
509 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
510 // the command-line, while issuing a warning and ignoring the flag value.
511 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
512 // existence of the flag.
513 //
514 // MANUAL CLEANUP ON JDK VERSION UPDATES:
515 // This table ensures that the handling of options will update automatically when the JDK
516 // version is incremented, but the source code needs to be cleanup up manually:
517 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
518 // variable should be removed, as well as users of the variable.
519 // - As "deprecated" options age into "obsolete" options, move the entry into the
520 // "Obsolete Flags" section of the table.
521 // - All expired options should be removed from the table.
522 static SpecialFlag const special_jvm_flags[] = {
523 // -------------- Deprecated Flags --------------
524 // --- Non-alias flags - sorted by obsolete_in then expired_in:
525 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
529 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
530 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
531
532 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
533 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
536
537 // -------------- Obsolete Flags - sorted by expired_in --------------
538 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
539 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
540 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
541 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
542 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
543 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
544
545 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
546 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
547 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
548 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
549 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
550 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
551 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
552 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
553 #endif
554
555 { NULL, JDK_Version(0), JDK_Version(0) }
556 };
557
558 // Flags that are aliases for other flags.
559 typedef struct {
560 const char* alias_name;
561 const char* real_name;
562 } AliasedFlag;
563
564 static AliasedFlag const aliased_jvm_flags[] = {
565 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
566 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
567 { NULL, NULL}
568 };
569
570 // NOTE: A compatibility request will be necessary for each alias to be removed.
571 static AliasedLoggingFlag const aliased_logging_flags[] = {
572 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
573 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
574 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
575 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
576 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
577 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
578 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
579 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
580 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
581 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
582 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
583 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
584 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
585 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
586 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
587 };
588
589 #ifndef PRODUCT
590 // These options are removed in jdk9. Remove this code for jdk10.
591 static AliasedFlag const removed_develop_logging_flags[] = {
592 { "TraceClassInitialization", "-Xlog:class+init" },
593 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
594 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
595 { "TraceItables", "-Xlog:itables=debug" },
596 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
597 { "TraceSafepoint", "-Xlog:safepoint=debug" },
598 { "TraceStartupTime", "-Xlog:startuptime" },
599 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
600 { "PrintVtables", "-Xlog:vtables=debug" },
601 { "VerboseVerification", "-Xlog:verification" },
602 { NULL, NULL }
603 };
604 #endif //PRODUCT
605
606 // Return true if "v" is less than "other", where "other" may be "undefined".
607 static bool version_less_than(JDK_Version v, JDK_Version other) {
608 assert(!v.is_undefined(), "must be defined");
609 if (!other.is_undefined() && v.compare(other) >= 0) {
610 return false;
611 } else {
612 return true;
613 }
614 }
615
616 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
617
618 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
619 // Allow extensions to have priority
620 if (lookup_special_flag_ext(flag_name, flag)) {
621 return true;
622 }
623
624 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
625 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
626 flag = special_jvm_flags[i];
627 return true;
628 }
629 }
630 return false;
631 }
632
633 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
634 assert(version != NULL, "Must provide a version buffer");
635 SpecialFlag flag;
636 if (lookup_special_flag(flag_name, flag)) {
637 if (!flag.obsolete_in.is_undefined()) {
638 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
639 *version = flag.obsolete_in;
640 return true;
641 }
642 }
643 }
644 return false;
645 }
646
647 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
648 assert(version != NULL, "Must provide a version buffer");
649 SpecialFlag flag;
650 if (lookup_special_flag(flag_name, flag)) {
651 if (!flag.deprecated_in.is_undefined()) {
652 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
653 version_less_than(JDK_Version::current(), flag.expired_in)) {
654 *version = flag.deprecated_in;
655 return 1;
656 } else {
657 return -1;
658 }
659 }
660 }
661 return 0;
662 }
663
664 #ifndef PRODUCT
665 const char* Arguments::removed_develop_logging_flag_name(const char* name){
666 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
667 const AliasedFlag& flag = removed_develop_logging_flags[i];
668 if (strcmp(flag.alias_name, name) == 0) {
669 return flag.real_name;
670 }
671 }
672 return NULL;
673 }
674 #endif // PRODUCT
675
676 const char* Arguments::real_flag_name(const char *flag_name) {
677 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
678 const AliasedFlag& flag_status = aliased_jvm_flags[i];
679 if (strcmp(flag_status.alias_name, flag_name) == 0) {
680 return flag_status.real_name;
681 }
682 }
683 return flag_name;
684 }
685
686 #ifdef ASSERT
687 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
688 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
689 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
690 return true;
691 }
692 }
693 return false;
694 }
695
696 // Verifies the correctness of the entries in the special_jvm_flags table.
697 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
698 // version being earlier than the deprecation version, then a warning is issued
699 // and verification fails - by returning false. If it is detected that the table
700 // is out of date, with respect to the current version, then a warning is issued
701 // but verification does not fail. This allows the VM to operate when the version
702 // is first updated, without needing to update all the impacted flags at the
703 // same time.
704 static bool verify_special_jvm_flags() {
705 bool success = true;
706 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
707 const SpecialFlag& flag = special_jvm_flags[i];
708 if (lookup_special_flag(flag.name, i)) {
709 warning("Duplicate special flag declaration \"%s\"", flag.name);
710 success = false;
711 }
712 if (flag.deprecated_in.is_undefined() &&
713 flag.obsolete_in.is_undefined()) {
714 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
715 success = false;
716 }
717
718 if (!flag.deprecated_in.is_undefined()) {
719 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
720 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
721 success = false;
722 }
723
724 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
725 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
726 success = false;
727 }
728 }
729
730 if (!flag.obsolete_in.is_undefined()) {
731 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
732 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
733 success = false;
734 }
735
736 // if flag has become obsolete it should not have a "globals" flag defined anymore.
737 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
738 if (JVMFlag::find_flag(flag.name) != NULL) {
739 // Temporarily disable the warning: 8196739
740 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
741 }
742 }
743 }
744
745 if (!flag.expired_in.is_undefined()) {
746 // if flag has become expired it should not have a "globals" flag defined anymore.
747 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
748 if (JVMFlag::find_flag(flag.name) != NULL) {
749 // Temporarily disable the warning: 8196739
750 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
751 }
752 }
753 }
754
755 }
756 return success;
757 }
758 #endif
759
760 // Parses a size specification string.
761 bool Arguments::atojulong(const char *s, julong* result) {
762 julong n = 0;
763
764 // First char must be a digit. Don't allow negative numbers or leading spaces.
765 if (!isdigit(*s)) {
766 return false;
767 }
768
769 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
770 char* remainder;
771 errno = 0;
772 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
773 if (errno != 0) {
774 return false;
775 }
776
777 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
778 if (remainder == s || strlen(remainder) > 1) {
779 return false;
780 }
781
782 switch (*remainder) {
783 case 'T': case 't':
784 *result = n * G * K;
785 // Check for overflow.
786 if (*result/((julong)G * K) != n) return false;
787 return true;
788 case 'G': case 'g':
789 *result = n * G;
790 if (*result/G != n) return false;
791 return true;
792 case 'M': case 'm':
793 *result = n * M;
794 if (*result/M != n) return false;
795 return true;
796 case 'K': case 'k':
797 *result = n * K;
798 if (*result/K != n) return false;
799 return true;
800 case '\0':
801 *result = n;
802 return true;
803 default:
804 return false;
805 }
806 }
807
808 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
809 if (size < min_size) return arg_too_small;
810 if (size > max_size) return arg_too_big;
811 return arg_in_range;
812 }
813
814 // Describe an argument out of range error
815 void Arguments::describe_range_error(ArgsRange errcode) {
816 switch(errcode) {
817 case arg_too_big:
818 jio_fprintf(defaultStream::error_stream(),
819 "The specified size exceeds the maximum "
820 "representable size.\n");
821 break;
822 case arg_too_small:
823 case arg_unreadable:
824 case arg_in_range:
825 // do nothing for now
826 break;
827 default:
828 ShouldNotReachHere();
829 }
830 }
831
832 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
833 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
834 return true;
835 } else {
836 return false;
837 }
838 }
839
840 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
841 char* end;
842 errno = 0;
843 double v = strtod(value, &end);
844 if ((errno != 0) || (*end != 0)) {
845 return false;
846 }
847
848 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
849 return true;
850 }
851 return false;
852 }
853
854 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
855 julong v;
856 int int_v;
857 intx intx_v;
858 bool is_neg = false;
859 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
860
861 if (result == NULL) {
862 return false;
863 }
864
865 // Check the sign first since atojulong() parses only unsigned values.
866 if (*value == '-') {
867 if (!result->is_intx() && !result->is_int()) {
868 return false;
869 }
870 value++;
871 is_neg = true;
872 }
873 if (!Arguments::atojulong(value, &v)) {
874 return false;
875 }
876 if (result->is_int()) {
877 int_v = (int) v;
878 if (is_neg) {
879 int_v = -int_v;
880 }
881 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
882 } else if (result->is_uint()) {
883 uint uint_v = (uint) v;
884 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
885 } else if (result->is_intx()) {
886 intx_v = (intx) v;
887 if (is_neg) {
888 intx_v = -intx_v;
889 }
890 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
891 } else if (result->is_uintx()) {
892 uintx uintx_v = (uintx) v;
893 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
894 } else if (result->is_uint64_t()) {
895 uint64_t uint64_t_v = (uint64_t) v;
896 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
897 } else if (result->is_size_t()) {
898 size_t size_t_v = (size_t) v;
899 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
900 } else if (result->is_double()) {
901 double double_v = (double) v;
902 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
903 } else {
904 return false;
905 }
906 }
907
908 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
909 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
910 // Contract: JVMFlag always returns a pointer that needs freeing.
911 FREE_C_HEAP_ARRAY(char, value);
912 return true;
913 }
914
915 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
916 const char* old_value = "";
917 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
918 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
919 size_t new_len = strlen(new_value);
920 const char* value;
921 char* free_this_too = NULL;
922 if (old_len == 0) {
923 value = new_value;
924 } else if (new_len == 0) {
925 value = old_value;
926 } else {
927 size_t length = old_len + 1 + new_len + 1;
928 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
929 // each new setting adds another LINE to the switch:
930 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
931 value = buf;
932 free_this_too = buf;
933 }
934 (void) JVMFlag::ccstrAtPut(name, &value, origin);
935 // JVMFlag always returns a pointer that needs freeing.
936 FREE_C_HEAP_ARRAY(char, value);
937 if (free_this_too != NULL) {
938 // JVMFlag made its own copy, so I must delete my own temp. buffer.
939 FREE_C_HEAP_ARRAY(char, free_this_too);
940 }
941 return true;
942 }
943
944 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
945 const char* real_name = real_flag_name(arg);
946 JDK_Version since = JDK_Version();
947 switch (is_deprecated_flag(arg, &since)) {
948 case -1:
949 return NULL; // obsolete or expired, don't process normally
950 case 0:
951 return real_name;
952 case 1: {
953 if (warn) {
954 char version[256];
955 since.to_string(version, sizeof(version));
956 if (real_name != arg) {
957 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
958 arg, version, real_name);
959 } else {
960 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
961 arg, version);
962 }
963 }
964 return real_name;
965 }
966 }
967 ShouldNotReachHere();
968 return NULL;
969 }
970
971 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
972 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
973 // Set tagset string buffer at max size of 256, large enough for any alias tagset
974 const int max_tagset_size = 256;
975 int max_tagset_len = max_tagset_size - 1;
976 char tagset_buffer[max_tagset_size];
977 tagset_buffer[0] = '\0';
978
979 // Write tag-set for aliased logging option, in string list form
980 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
981 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
982 if (i > 0) {
983 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
984 }
985 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
986 }
987 if (!alf.exactMatch) {
988 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
989 }
990 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
991 (on) ? "+" : "-",
992 name,
993 tagset_buffer,
994 (on) ? LogLevel::name(alf.level) : "off");
995 }
996
997 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
998 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
999 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1000 if (strcmp(alf.alias_name, name) == 0) {
1001 log_deprecated_flag(name, on, alf);
1002 return alf;
1003 }
1004 }
1005 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1006 return a;
1007 }
1008
1009 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1010
1011 // range of acceptable characters spelled out for portability reasons
1012 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1013 #define BUFLEN 255
1014 char name[BUFLEN+1];
1015 char dummy;
1016 const char* real_name;
1017 bool warn_if_deprecated = true;
1018
1019 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1020 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1021 if (alf.alias_name != NULL){
1022 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1023 return true;
1024 }
1025 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1026 if (real_name == NULL) {
1027 return false;
1028 }
1029 return set_bool_flag(real_name, false, origin);
1030 }
1031 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1032 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1033 if (alf.alias_name != NULL){
1034 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1035 return true;
1036 }
1037 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1038 if (real_name == NULL) {
1039 return false;
1040 }
1041 return set_bool_flag(real_name, true, origin);
1042 }
1043
1044 char punct;
1045 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1046 const char* value = strchr(arg, '=') + 1;
1047 JVMFlag* flag;
1048
1049 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1050 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1051 if (alf.alias_name != NULL) {
1052 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1053 return true;
1054 }
1055 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1056 if (real_name == NULL) {
1057 return false;
1058 }
1059 flag = JVMFlag::find_flag(real_name);
1060 if (flag != NULL && flag->is_ccstr()) {
1061 if (flag->ccstr_accumulates()) {
1062 return append_to_string_flag(real_name, value, origin);
1063 } else {
1064 if (value[0] == '\0') {
1065 value = NULL;
1066 }
1067 return set_string_flag(real_name, value, origin);
1068 }
1069 } else {
1070 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1071 }
1072 }
1073
1074 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1075 const char* value = strchr(arg, '=') + 1;
1076 // -XX:Foo:=xxx will reset the string flag to the given value.
1077 if (value[0] == '\0') {
1078 value = NULL;
1079 }
1080 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1081 if (real_name == NULL) {
1082 return false;
1083 }
1084 return set_string_flag(real_name, value, origin);
1085 }
1086
1087 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1088 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1089 #define NUMBER_RANGE "[0123456789eE+-]"
1090 char value[BUFLEN + 1];
1091 char value2[BUFLEN + 1];
1092 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1093 // Looks like a floating-point number -- try again with more lenient format string
1094 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1095 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1096 if (real_name == NULL) {
1097 return false;
1098 }
1099 return set_fp_numeric_flag(real_name, value, origin);
1100 }
1101 }
1102
1103 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1104 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1105 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1106 if (real_name == NULL) {
1107 return false;
1108 }
1109 return set_numeric_flag(real_name, value, origin);
1110 }
1111
1112 return false;
1113 }
1114
1115 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1116 assert(bldarray != NULL, "illegal argument");
1117
1118 if (arg == NULL) {
1119 return;
1120 }
1121
1122 int new_count = *count + 1;
1123
1124 // expand the array and add arg to the last element
1125 if (*bldarray == NULL) {
1126 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1127 } else {
1128 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1129 }
1130 (*bldarray)[*count] = os::strdup_check_oom(arg);
1131 *count = new_count;
1132 }
1133
1134 void Arguments::build_jvm_args(const char* arg) {
1135 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1136 }
1137
1138 void Arguments::build_jvm_flags(const char* arg) {
1139 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1140 }
1141
1142 // utility function to return a string that concatenates all
1143 // strings in a given char** array
1144 const char* Arguments::build_resource_string(char** args, int count) {
1145 if (args == NULL || count == 0) {
1146 return NULL;
1147 }
1148 size_t length = 0;
1149 for (int i = 0; i < count; i++) {
1150 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1151 }
1152 char* s = NEW_RESOURCE_ARRAY(char, length);
1153 char* dst = s;
1154 for (int j = 0; j < count; j++) {
1155 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1156 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1157 dst += offset;
1158 length -= offset;
1159 }
1160 return (const char*) s;
1161 }
1162
1163 void Arguments::print_on(outputStream* st) {
1164 st->print_cr("VM Arguments:");
1165 if (num_jvm_flags() > 0) {
1166 st->print("jvm_flags: "); print_jvm_flags_on(st);
1167 st->cr();
1168 }
1169 if (num_jvm_args() > 0) {
1170 st->print("jvm_args: "); print_jvm_args_on(st);
1171 st->cr();
1172 }
1173 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1174 if (_java_class_path != NULL) {
1175 char* path = _java_class_path->value();
1176 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1177 }
1178 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1179 }
1180
1181 void Arguments::print_summary_on(outputStream* st) {
1182 // Print the command line. Environment variables that are helpful for
1183 // reproducing the problem are written later in the hs_err file.
1184 // flags are from setting file
1185 if (num_jvm_flags() > 0) {
1186 st->print_raw("Settings File: ");
1187 print_jvm_flags_on(st);
1188 st->cr();
1189 }
1190 // args are the command line and environment variable arguments.
1191 st->print_raw("Command Line: ");
1192 if (num_jvm_args() > 0) {
1193 print_jvm_args_on(st);
1194 }
1195 // this is the classfile and any arguments to the java program
1196 if (java_command() != NULL) {
1197 st->print("%s", java_command());
1198 }
1199 st->cr();
1200 }
1201
1202 void Arguments::print_jvm_flags_on(outputStream* st) {
1203 if (_num_jvm_flags > 0) {
1204 for (int i=0; i < _num_jvm_flags; i++) {
1205 st->print("%s ", _jvm_flags_array[i]);
1206 }
1207 }
1208 }
1209
1210 void Arguments::print_jvm_args_on(outputStream* st) {
1211 if (_num_jvm_args > 0) {
1212 for (int i=0; i < _num_jvm_args; i++) {
1213 st->print("%s ", _jvm_args_array[i]);
1214 }
1215 }
1216 }
1217
1218 bool Arguments::process_argument(const char* arg,
1219 jboolean ignore_unrecognized,
1220 JVMFlag::Flags origin) {
1221 JDK_Version since = JDK_Version();
1222
1223 if (parse_argument(arg, origin)) {
1224 return true;
1225 }
1226
1227 // Determine if the flag has '+', '-', or '=' characters.
1228 bool has_plus_minus = (*arg == '+' || *arg == '-');
1229 const char* const argname = has_plus_minus ? arg + 1 : arg;
1230
1231 size_t arg_len;
1232 const char* equal_sign = strchr(argname, '=');
1233 if (equal_sign == NULL) {
1234 arg_len = strlen(argname);
1235 } else {
1236 arg_len = equal_sign - argname;
1237 }
1238
1239 // Only make the obsolete check for valid arguments.
1240 if (arg_len <= BUFLEN) {
1241 // Construct a string which consists only of the argument name without '+', '-', or '='.
1242 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1243 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1244 if (is_obsolete_flag(stripped_argname, &since)) {
1245 char version[256];
1246 since.to_string(version, sizeof(version));
1247 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1248 return true;
1249 }
1250 #ifndef PRODUCT
1251 else {
1252 const char* replacement;
1253 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1254 log_warning(arguments)("%s has been removed. Please use %s instead.",
1255 stripped_argname,
1256 replacement);
1257 return false;
1258 }
1259 }
1260 #endif //PRODUCT
1261 }
1262
1263 // For locked flags, report a custom error message if available.
1264 // Otherwise, report the standard unrecognized VM option.
1265 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1266 if (found_flag != NULL) {
1267 char locked_message_buf[BUFLEN];
1268 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1269 if (strlen(locked_message_buf) == 0) {
1270 if (found_flag->is_bool() && !has_plus_minus) {
1271 jio_fprintf(defaultStream::error_stream(),
1272 "Missing +/- setting for VM option '%s'\n", argname);
1273 } else if (!found_flag->is_bool() && has_plus_minus) {
1274 jio_fprintf(defaultStream::error_stream(),
1275 "Unexpected +/- setting in VM option '%s'\n", argname);
1276 } else {
1277 jio_fprintf(defaultStream::error_stream(),
1278 "Improperly specified VM option '%s'\n", argname);
1279 }
1280 } else {
1281 #ifdef PRODUCT
1282 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1283 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1284 if (ignore_unrecognized && mismatched) {
1285 return true;
1286 }
1287 #endif
1288 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1289 }
1290 } else {
1291 if (ignore_unrecognized) {
1292 return true;
1293 }
1294 jio_fprintf(defaultStream::error_stream(),
1295 "Unrecognized VM option '%s'\n", argname);
1296 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1297 if (fuzzy_matched != NULL) {
1298 jio_fprintf(defaultStream::error_stream(),
1299 "Did you mean '%s%s%s'? ",
1300 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1301 fuzzy_matched->_name,
1302 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1303 }
1304 }
1305
1306 // allow for commandline "commenting out" options like -XX:#+Verbose
1307 return arg[0] == '#';
1308 }
1309
1310 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1311 FILE* stream = fopen(file_name, "rb");
1312 if (stream == NULL) {
1313 if (should_exist) {
1314 jio_fprintf(defaultStream::error_stream(),
1315 "Could not open settings file %s\n", file_name);
1316 return false;
1317 } else {
1318 return true;
1319 }
1320 }
1321
1322 char token[1024];
1323 int pos = 0;
1324
1325 bool in_white_space = true;
1326 bool in_comment = false;
1327 bool in_quote = false;
1328 char quote_c = 0;
1329 bool result = true;
1330
1331 int c = getc(stream);
1332 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1333 if (in_white_space) {
1334 if (in_comment) {
1335 if (c == '\n') in_comment = false;
1336 } else {
1337 if (c == '#') in_comment = true;
1338 else if (!isspace(c)) {
1339 in_white_space = false;
1340 token[pos++] = c;
1341 }
1342 }
1343 } else {
1344 if (c == '\n' || (!in_quote && isspace(c))) {
1345 // token ends at newline, or at unquoted whitespace
1346 // this allows a way to include spaces in string-valued options
1347 token[pos] = '\0';
1348 logOption(token);
1349 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1350 build_jvm_flags(token);
1351 pos = 0;
1352 in_white_space = true;
1353 in_quote = false;
1354 } else if (!in_quote && (c == '\'' || c == '"')) {
1355 in_quote = true;
1356 quote_c = c;
1357 } else if (in_quote && (c == quote_c)) {
1358 in_quote = false;
1359 } else {
1360 token[pos++] = c;
1361 }
1362 }
1363 c = getc(stream);
1364 }
1365 if (pos > 0) {
1366 token[pos] = '\0';
1367 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1368 build_jvm_flags(token);
1369 }
1370 fclose(stream);
1371 return result;
1372 }
1373
1374 //=============================================================================================================
1375 // Parsing of properties (-D)
1376
1377 const char* Arguments::get_property(const char* key) {
1378 return PropertyList_get_value(system_properties(), key);
1379 }
1380
1381 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1382 const char* eq = strchr(prop, '=');
1383 const char* key;
1384 const char* value = "";
1385
1386 if (eq == NULL) {
1387 // property doesn't have a value, thus use passed string
1388 key = prop;
1389 } else {
1390 // property have a value, thus extract it and save to the
1391 // allocated string
1392 size_t key_len = eq - prop;
1393 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1394
1395 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1396 key = tmp_key;
1397
1398 value = &prop[key_len + 1];
1399 }
1400
1401 if (strcmp(key, "java.compiler") == 0) {
1402 process_java_compiler_argument(value);
1403 // Record value in Arguments, but let it get passed to Java.
1404 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1405 strcmp(key, "sun.java.launcher.pid") == 0) {
1406 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1407 // private and are processed in process_sun_java_launcher_properties();
1408 // the sun.java.launcher property is passed on to the java application
1409 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1410 // append is true, writable is true, internal is false
1411 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1412 WriteableProperty, ExternalProperty);
1413 } else {
1414 if (strcmp(key, "sun.java.command") == 0) {
1415 char *old_java_command = _java_command;
1416 _java_command = os::strdup_check_oom(value, mtArguments);
1417 if (old_java_command != NULL) {
1418 os::free(old_java_command);
1419 }
1420 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1421 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1422 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1423 // its value without going through the property list or making a Java call.
1424 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1425 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1426 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1427 os::free((void *)old_java_vendor_url_bug);
1428 }
1429 }
1430
1431 // Create new property and add at the end of the list
1432 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1433 }
1434
1435 if (key != prop) {
1436 // SystemProperty copy passed value, thus free previously allocated
1437 // memory
1438 FreeHeap((void *)key);
1439 }
1440
1441 return true;
1442 }
1443
1444 #if INCLUDE_CDS
1445 const char* unsupported_properties[] = { "jdk.module.limitmods",
1446 "jdk.module.upgrade.path",
1447 "jdk.module.patch.0" };
1448 const char* unsupported_options[] = { "--limit-modules",
1449 "--upgrade-module-path",
1450 "--patch-module"
1451 };
1452 void Arguments::check_unsupported_dumping_properties() {
1453 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1454 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1455 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1456 SystemProperty* sp = system_properties();
1457 while (sp != NULL) {
1458 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1459 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1460 vm_exit_during_initialization(
1461 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1462 }
1463 }
1464 sp = sp->next();
1465 }
1466
1467 // Check for an exploded module build in use with -Xshare:dump.
1468 if (!has_jimage()) {
1469 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1470 }
1471 }
1472
1473 bool Arguments::check_unsupported_cds_runtime_properties() {
1474 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1475 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1476 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1477 if (get_property(unsupported_properties[i]) != NULL) {
1478 if (RequireSharedSpaces) {
1479 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1480 }
1481 return true;
1482 }
1483 }
1484 return false;
1485 }
1486 #endif
1487
1488 //===========================================================================================================
1489 // Setting int/mixed/comp mode flags
1490
1491 void Arguments::set_mode_flags(Mode mode) {
1492 // Set up default values for all flags.
1493 // If you add a flag to any of the branches below,
1494 // add a default value for it here.
1495 set_java_compiler(false);
1496 _mode = mode;
1497
1498 // Ensure Agent_OnLoad has the correct initial values.
1499 // This may not be the final mode; mode may change later in onload phase.
1500 PropertyList_unique_add(&_system_properties, "java.vm.info",
1501 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1502
1503 UseInterpreter = true;
1504 UseCompiler = true;
1505 UseLoopCounter = true;
1506
1507 // Default values may be platform/compiler dependent -
1508 // use the saved values
1509 ClipInlining = Arguments::_ClipInlining;
1510 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1511 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1512 BackgroundCompilation = Arguments::_BackgroundCompilation;
1513 if (TieredCompilation) {
1514 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1515 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1516 }
1517 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1518 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1519 }
1520 }
1521
1522 // Change from defaults based on mode
1523 switch (mode) {
1524 default:
1525 ShouldNotReachHere();
1526 break;
1527 case _int:
1528 UseCompiler = false;
1529 UseLoopCounter = false;
1530 AlwaysCompileLoopMethods = false;
1531 UseOnStackReplacement = false;
1532 break;
1533 case _mixed:
1534 // same as default
1535 break;
1536 case _comp:
1537 UseInterpreter = false;
1538 BackgroundCompilation = false;
1539 ClipInlining = false;
1540 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1541 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1542 // compile a level 4 (C2) and then continue executing it.
1543 if (TieredCompilation) {
1544 Tier3InvokeNotifyFreqLog = 0;
1545 Tier4InvocationThreshold = 0;
1546 }
1547 break;
1548 }
1549 }
1550
1551 // Conflict: required to use shared spaces (-Xshare:on), but
1552 // incompatible command line options were chosen.
1553 static void no_shared_spaces(const char* message) {
1554 if (RequireSharedSpaces) {
1555 jio_fprintf(defaultStream::error_stream(),
1556 "Class data sharing is inconsistent with other specified options.\n");
1557 vm_exit_during_initialization("Unable to use shared archive", message);
1558 } else {
1559 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1560 }
1561 }
1562
1563 void set_object_alignment() {
1564 // Object alignment.
1565 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1566 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1567 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1568 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1569 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1570 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1571
1572 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1573 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1574
1575 // Oop encoding heap max
1576 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1577
1578 if (SurvivorAlignmentInBytes == 0) {
1579 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1580 }
1581 }
1582
1583 size_t Arguments::max_heap_for_compressed_oops() {
1584 // Avoid sign flip.
1585 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1586 // We need to fit both the NULL page and the heap into the memory budget, while
1587 // keeping alignment constraints of the heap. To guarantee the latter, as the
1588 // NULL page is located before the heap, we pad the NULL page to the conservative
1589 // maximum alignment that the GC may ever impose upon the heap.
1590 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1591 _conservative_max_heap_alignment);
1592
1593 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1594 NOT_LP64(ShouldNotReachHere(); return 0);
1595 }
1596
1597 void Arguments::set_use_compressed_oops() {
1598 #ifndef ZERO
1599 #ifdef _LP64
1600 // MaxHeapSize is not set up properly at this point, but
1601 // the only value that can override MaxHeapSize if we are
1602 // to use UseCompressedOops is InitialHeapSize.
1603 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1604
1605 if (max_heap_size <= max_heap_for_compressed_oops()) {
1606 #if !defined(COMPILER1) || defined(TIERED)
1607 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1608 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1609 }
1610 #endif
1611 } else {
1612 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1613 warning("Max heap size too large for Compressed Oops");
1614 FLAG_SET_DEFAULT(UseCompressedOops, false);
1615 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1616 }
1617 }
1618 #endif // _LP64
1619 #endif // ZERO
1620 }
1621
1622
1623 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1624 // set_use_compressed_oops().
1625 void Arguments::set_use_compressed_klass_ptrs() {
1626 #ifndef ZERO
1627 #ifdef _LP64
1628 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1629 if (!UseCompressedOops) {
1630 if (UseCompressedClassPointers) {
1631 warning("UseCompressedClassPointers requires UseCompressedOops");
1632 }
1633 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1634 } else {
1635 // Turn on UseCompressedClassPointers too
1636 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1637 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1638 }
1639 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1640 if (UseCompressedClassPointers) {
1641 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1642 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1643 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1644 }
1645 }
1646 }
1647 #endif // _LP64
1648 #endif // !ZERO
1649 }
1650
1651 void Arguments::set_conservative_max_heap_alignment() {
1652 // The conservative maximum required alignment for the heap is the maximum of
1653 // the alignments imposed by several sources: any requirements from the heap
1654 // itself, the collector policy and the maximum page size we may run the VM
1655 // with.
1656 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1657 _conservative_max_heap_alignment = MAX4(heap_alignment,
1658 (size_t)os::vm_allocation_granularity(),
1659 os::max_page_size(),
1660 CollectorPolicy::compute_heap_alignment());
1661 }
1662
1663 jint Arguments::set_ergonomics_flags() {
1664 GCConfig::initialize();
1665
1666 set_conservative_max_heap_alignment();
1667
1668 #ifndef ZERO
1669 #ifdef _LP64
1670 set_use_compressed_oops();
1671
1672 // set_use_compressed_klass_ptrs() must be called after calling
1673 // set_use_compressed_oops().
1674 set_use_compressed_klass_ptrs();
1675
1676 // Also checks that certain machines are slower with compressed oops
1677 // in vm_version initialization code.
1678 #endif // _LP64
1679 #endif // !ZERO
1680
1681 return JNI_OK;
1682 }
1683
1684 julong Arguments::limit_by_allocatable_memory(julong limit) {
1685 julong max_allocatable;
1686 julong result = limit;
1687 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1688 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1689 }
1690 return result;
1691 }
1692
1693 // Use static initialization to get the default before parsing
1694 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1695
1696 void Arguments::set_heap_size() {
1697 julong phys_mem =
1698 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1699 : (julong)MaxRAM;
1700
1701 // Convert deprecated flags
1702 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1703 !FLAG_IS_DEFAULT(MaxRAMFraction))
1704 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1705
1706 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1707 !FLAG_IS_DEFAULT(MinRAMFraction))
1708 MinRAMPercentage = 100.0 / MinRAMFraction;
1709
1710 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1711 !FLAG_IS_DEFAULT(InitialRAMFraction))
1712 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1713
1714 // If the maximum heap size has not been set with -Xmx,
1715 // then set it as fraction of the size of physical memory,
1716 // respecting the maximum and minimum sizes of the heap.
1717 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1718 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1719 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1720 if (reasonable_min < MaxHeapSize) {
1721 // Small physical memory, so use a minimum fraction of it for the heap
1722 reasonable_max = reasonable_min;
1723 } else {
1724 // Not-small physical memory, so require a heap at least
1725 // as large as MaxHeapSize
1726 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1727 }
1728
1729 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1730 // Limit the heap size to ErgoHeapSizeLimit
1731 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1732 }
1733 if (UseCompressedOops) {
1734 // Limit the heap size to the maximum possible when using compressed oops
1735 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1736
1737 // HeapBaseMinAddress can be greater than default but not less than.
1738 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1739 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1740 // matches compressed oops printing flags
1741 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1742 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1743 DefaultHeapBaseMinAddress,
1744 DefaultHeapBaseMinAddress/G,
1745 HeapBaseMinAddress);
1746 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1747 }
1748 }
1749
1750 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1751 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1752 // but it should be not less than default MaxHeapSize.
1753 max_coop_heap -= HeapBaseMinAddress;
1754 }
1755 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1756 }
1757 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1758
1759 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1760 // An initial heap size was specified on the command line,
1761 // so be sure that the maximum size is consistent. Done
1762 // after call to limit_by_allocatable_memory because that
1763 // method might reduce the allocation size.
1764 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1765 }
1766
1767 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1768 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1769 }
1770
1771 // If the minimum or initial heap_size have not been set or requested to be set
1772 // ergonomically, set them accordingly.
1773 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1774 julong reasonable_minimum = (julong)(OldSize + NewSize);
1775
1776 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1777
1778 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1779
1780 if (InitialHeapSize == 0) {
1781 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1782
1783 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1784 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1785
1786 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1787
1788 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1789 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1790 }
1791 // If the minimum heap size has not been set (via -Xms),
1792 // synchronize with InitialHeapSize to avoid errors with the default value.
1793 if (min_heap_size() == 0) {
1794 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1795 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1796 }
1797 }
1798 }
1799
1800 // This option inspects the machine and attempts to set various
1801 // parameters to be optimal for long-running, memory allocation
1802 // intensive jobs. It is intended for machines with large
1803 // amounts of cpu and memory.
1804 jint Arguments::set_aggressive_heap_flags() {
1805 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1806 // VM, but we may not be able to represent the total physical memory
1807 // available (like having 8gb of memory on a box but using a 32bit VM).
1808 // Thus, we need to make sure we're using a julong for intermediate
1809 // calculations.
1810 julong initHeapSize;
1811 julong total_memory = os::physical_memory();
1812
1813 if (total_memory < (julong) 256 * M) {
1814 jio_fprintf(defaultStream::error_stream(),
1815 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1816 vm_exit(1);
1817 }
1818
1819 // The heap size is half of available memory, or (at most)
1820 // all of possible memory less 160mb (leaving room for the OS
1821 // when using ISM). This is the maximum; because adaptive sizing
1822 // is turned on below, the actual space used may be smaller.
1823
1824 initHeapSize = MIN2(total_memory / (julong) 2,
1825 total_memory - (julong) 160 * M);
1826
1827 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1828
1829 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1830 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1831 return JNI_EINVAL;
1832 }
1833 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1834 return JNI_EINVAL;
1835 }
1836 // Currently the minimum size and the initial heap sizes are the same.
1837 set_min_heap_size(initHeapSize);
1838 }
1839 if (FLAG_IS_DEFAULT(NewSize)) {
1840 // Make the young generation 3/8ths of the total heap.
1841 if (FLAG_SET_CMDLINE(size_t, NewSize,
1842 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1843 return JNI_EINVAL;
1844 }
1845 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1846 return JNI_EINVAL;
1847 }
1848 }
1849
1850 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1851 FLAG_SET_DEFAULT(UseLargePages, true);
1852 #endif
1853
1854 // Increase some data structure sizes for efficiency
1855 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1856 return JNI_EINVAL;
1857 }
1858 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) {
1859 return JNI_EINVAL;
1860 }
1861 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1862 return JNI_EINVAL;
1863 }
1864
1865 // See the OldPLABSize comment below, but replace 'after promotion'
1866 // with 'after copying'. YoungPLABSize is the size of the survivor
1867 // space per-gc-thread buffers. The default is 4kw.
1868 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1869 return JNI_EINVAL;
1870 }
1871
1872 // OldPLABSize is the size of the buffers in the old gen that
1873 // UseParallelGC uses to promote live data that doesn't fit in the
1874 // survivor spaces. At any given time, there's one for each gc thread.
1875 // The default size is 1kw. These buffers are rarely used, since the
1876 // survivor spaces are usually big enough. For specjbb, however, there
1877 // are occasions when there's lots of live data in the young gen
1878 // and we end up promoting some of it. We don't have a definite
1879 // explanation for why bumping OldPLABSize helps, but the theory
1880 // is that a bigger PLAB results in retaining something like the
1881 // original allocation order after promotion, which improves mutator
1882 // locality. A minor effect may be that larger PLABs reduce the
1883 // number of PLAB allocation events during gc. The value of 8kw
1884 // was arrived at by experimenting with specjbb.
1885 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1886 return JNI_EINVAL;
1887 }
1888
1889 // Enable parallel GC and adaptive generation sizing
1890 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) {
1891 return JNI_EINVAL;
1892 }
1893
1894 // Encourage steady state memory management
1895 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1896 return JNI_EINVAL;
1897 }
1898
1899 // This appears to improve mutator locality
1900 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1901 return JNI_EINVAL;
1902 }
1903
1904 // Get around early Solaris scheduling bug
1905 // (affinity vs other jobs on system)
1906 // but disallow DR and offlining (5008695).
1907 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1908 return JNI_EINVAL;
1909 }
1910
1911 return JNI_OK;
1912 }
1913
1914 // This must be called after ergonomics.
1915 void Arguments::set_bytecode_flags() {
1916 if (!RewriteBytecodes) {
1917 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1918 }
1919 }
1920
1921 // Aggressive optimization flags
1922 jint Arguments::set_aggressive_opts_flags() {
1923 #ifdef COMPILER2
1924 if (AggressiveUnboxing) {
1925 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1926 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1927 } else if (!EliminateAutoBox) {
1928 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1929 AggressiveUnboxing = false;
1930 }
1931 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1932 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1933 } else if (!DoEscapeAnalysis) {
1934 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1935 AggressiveUnboxing = false;
1936 }
1937 }
1938 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1939 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1940 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1941 }
1942 // Feed the cache size setting into the JDK
1943 char buffer[1024];
1944 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1945 if (!add_property(buffer)) {
1946 return JNI_ENOMEM;
1947 }
1948 }
1949 #endif
1950
1951 return JNI_OK;
1952 }
1953
1954 //===========================================================================================================
1955 // Parsing of java.compiler property
1956
1957 void Arguments::process_java_compiler_argument(const char* arg) {
1958 // For backwards compatibility, Djava.compiler=NONE or ""
1959 // causes us to switch to -Xint mode UNLESS -Xdebug
1960 // is also specified.
1961 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1962 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1963 }
1964 }
1965
1966 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1967 _sun_java_launcher = os::strdup_check_oom(launcher);
1968 }
1969
1970 bool Arguments::created_by_java_launcher() {
1971 assert(_sun_java_launcher != NULL, "property must have value");
1972 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1973 }
1974
1975 bool Arguments::sun_java_launcher_is_altjvm() {
1976 return _sun_java_launcher_is_altjvm;
1977 }
1978
1979 //===========================================================================================================
1980 // Parsing of main arguments
1981
1982 unsigned int addreads_count = 0;
1983 unsigned int addexports_count = 0;
1984 unsigned int addopens_count = 0;
1985 unsigned int addmods_count = 0;
1986 unsigned int patch_mod_count = 0;
1987
1988 // Check the consistency of vm_init_args
1989 bool Arguments::check_vm_args_consistency() {
1990 // Method for adding checks for flag consistency.
1991 // The intent is to warn the user of all possible conflicts,
1992 // before returning an error.
1993 // Note: Needs platform-dependent factoring.
1994 bool status = true;
1995
1996 if (TLABRefillWasteFraction == 0) {
1997 jio_fprintf(defaultStream::error_stream(),
1998 "TLABRefillWasteFraction should be a denominator, "
1999 "not " SIZE_FORMAT "\n",
2000 TLABRefillWasteFraction);
2001 status = false;
2002 }
2003
2004 if (PrintNMTStatistics) {
2005 #if INCLUDE_NMT
2006 if (MemTracker::tracking_level() == NMT_off) {
2007 #endif // INCLUDE_NMT
2008 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2009 PrintNMTStatistics = false;
2010 #if INCLUDE_NMT
2011 }
2012 #endif
2013 }
2014
2015 status = CompilerConfig::check_args_consistency(status);
2016 #if INCLUDE_JVMCI
2017 if (status && EnableJVMCI) {
2018 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2019 AddProperty, UnwriteableProperty, InternalProperty);
2020 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2021 return false;
2022 }
2023 }
2024 #endif
2025
2026 #ifndef SUPPORT_RESERVED_STACK_AREA
2027 if (StackReservedPages != 0) {
2028 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2029 warning("Reserved Stack Area not supported on this platform");
2030 }
2031 #endif
2032
2033 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2034 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2035 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2036 }
2037 }
2038
2039 status = status && GCArguments::check_args_consistency();
2040
2041 return status;
2042 }
2043
2044 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2045 const char* option_type) {
2046 if (ignore) return false;
2047
2048 const char* spacer = " ";
2049 if (option_type == NULL) {
2050 option_type = ++spacer; // Set both to the empty string.
2051 }
2052
2053 jio_fprintf(defaultStream::error_stream(),
2054 "Unrecognized %s%soption: %s\n", option_type, spacer,
2055 option->optionString);
2056 return true;
2057 }
2058
2059 static const char* user_assertion_options[] = {
2060 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2061 };
2062
2063 static const char* system_assertion_options[] = {
2064 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2065 };
2066
2067 bool Arguments::parse_uintx(const char* value,
2068 uintx* uintx_arg,
2069 uintx min_size) {
2070
2071 // Check the sign first since atojulong() parses only unsigned values.
2072 bool value_is_positive = !(*value == '-');
2073
2074 if (value_is_positive) {
2075 julong n;
2076 bool good_return = atojulong(value, &n);
2077 if (good_return) {
2078 bool above_minimum = n >= min_size;
2079 bool value_is_too_large = n > max_uintx;
2080
2081 if (above_minimum && !value_is_too_large) {
2082 *uintx_arg = n;
2083 return true;
2084 }
2085 }
2086 }
2087 return false;
2088 }
2089
2090 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2091 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2092 char* property = AllocateHeap(prop_len, mtArguments);
2093 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2094 if (ret < 0 || ret >= (int)prop_len) {
2095 FreeHeap(property);
2096 return false;
2097 }
2098 bool added = add_property(property, UnwriteableProperty, internal);
2099 FreeHeap(property);
2100 return added;
2101 }
2102
2103 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2104 const unsigned int props_count_limit = 1000;
2105 const int max_digits = 3;
2106 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2107
2108 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2109 if (count < props_count_limit) {
2110 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2111 char* property = AllocateHeap(prop_len, mtArguments);
2112 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2113 if (ret < 0 || ret >= (int)prop_len) {
2114 FreeHeap(property);
2115 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2116 return false;
2117 }
2118 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2119 FreeHeap(property);
2120 return added;
2121 }
2122
2123 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2124 return false;
2125 }
2126
2127 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2128 julong* long_arg,
2129 julong min_size,
2130 julong max_size) {
2131 if (!atojulong(s, long_arg)) return arg_unreadable;
2132 return check_memory_size(*long_arg, min_size, max_size);
2133 }
2134
2135 // Parse JavaVMInitArgs structure
2136
2137 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2138 const JavaVMInitArgs *java_options_args,
2139 const JavaVMInitArgs *cmd_line_args) {
2140 bool patch_mod_javabase = false;
2141
2142 // Save default settings for some mode flags
2143 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2144 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2145 Arguments::_ClipInlining = ClipInlining;
2146 Arguments::_BackgroundCompilation = BackgroundCompilation;
2147 if (TieredCompilation) {
2148 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2149 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2150 }
2151
2152 // Setup flags for mixed which is the default
2153 set_mode_flags(_mixed);
2154
2155 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2156 // variable (if present).
2157 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2158 if (result != JNI_OK) {
2159 return result;
2160 }
2161
2162 // Parse args structure generated from the command line flags.
2163 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2164 if (result != JNI_OK) {
2165 return result;
2166 }
2167
2168 // Parse args structure generated from the _JAVA_OPTIONS environment
2169 // variable (if present) (mimics classic VM)
2170 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2171 if (result != JNI_OK) {
2172 return result;
2173 }
2174
2175 // We need to ensure processor and memory resources have been properly
2176 // configured - which may rely on arguments we just processed - before
2177 // doing the final argument processing. Any argument processing that
2178 // needs to know about processor and memory resources must occur after
2179 // this point.
2180
2181 os::init_container_support();
2182
2183 // Do final processing now that all arguments have been parsed
2184 result = finalize_vm_init_args(patch_mod_javabase);
2185 if (result != JNI_OK) {
2186 return result;
2187 }
2188
2189 return JNI_OK;
2190 }
2191
2192 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2193 // represents a valid JDWP agent. is_path==true denotes that we
2194 // are dealing with -agentpath (case where name is a path), otherwise with
2195 // -agentlib
2196 bool valid_jdwp_agent(char *name, bool is_path) {
2197 char *_name;
2198 const char *_jdwp = "jdwp";
2199 size_t _len_jdwp, _len_prefix;
2200
2201 if (is_path) {
2202 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2203 return false;
2204 }
2205
2206 _name++; // skip past last path separator
2207 _len_prefix = strlen(JNI_LIB_PREFIX);
2208
2209 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2210 return false;
2211 }
2212
2213 _name += _len_prefix;
2214 _len_jdwp = strlen(_jdwp);
2215
2216 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2217 _name += _len_jdwp;
2218 }
2219 else {
2220 return false;
2221 }
2222
2223 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2224 return false;
2225 }
2226
2227 return true;
2228 }
2229
2230 if (strcmp(name, _jdwp) == 0) {
2231 return true;
2232 }
2233
2234 return false;
2235 }
2236
2237 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2238 // --patch-module=<module>=<file>(<pathsep><file>)*
2239 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2240 // Find the equal sign between the module name and the path specification
2241 const char* module_equal = strchr(patch_mod_tail, '=');
2242 if (module_equal == NULL) {
2243 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2244 return JNI_ERR;
2245 } else {
2246 // Pick out the module name
2247 size_t module_len = module_equal - patch_mod_tail;
2248 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2249 if (module_name != NULL) {
2250 memcpy(module_name, patch_mod_tail, module_len);
2251 *(module_name + module_len) = '\0';
2252 // The path piece begins one past the module_equal sign
2253 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2254 FREE_C_HEAP_ARRAY(char, module_name);
2255 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2256 return JNI_ENOMEM;
2257 }
2258 } else {
2259 return JNI_ENOMEM;
2260 }
2261 }
2262 return JNI_OK;
2263 }
2264
2265 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2266 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2267 // The min and max sizes match the values in globals.hpp, but scaled
2268 // with K. The values have been chosen so that alignment with page
2269 // size doesn't change the max value, which makes the conversions
2270 // back and forth between Xss value and ThreadStackSize value easier.
2271 // The values have also been chosen to fit inside a 32-bit signed type.
2272 const julong min_ThreadStackSize = 0;
2273 const julong max_ThreadStackSize = 1 * M;
2274
2275 const julong min_size = min_ThreadStackSize * K;
2276 const julong max_size = max_ThreadStackSize * K;
2277
2278 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2279
2280 julong size = 0;
2281 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2282 if (errcode != arg_in_range) {
2283 bool silent = (option == NULL); // Allow testing to silence error messages
2284 if (!silent) {
2285 jio_fprintf(defaultStream::error_stream(),
2286 "Invalid thread stack size: %s\n", option->optionString);
2287 describe_range_error(errcode);
2288 }
2289 return JNI_EINVAL;
2290 }
2291
2292 // Internally track ThreadStackSize in units of 1024 bytes.
2293 const julong size_aligned = align_up(size, K);
2294 assert(size <= size_aligned,
2295 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2296 size, size_aligned);
2297
2298 const julong size_in_K = size_aligned / K;
2299 assert(size_in_K < (julong)max_intx,
2300 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2301 size_in_K);
2302
2303 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2304 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2305 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2306 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2307 max_expanded, size_in_K);
2308
2309 *out_ThreadStackSize = (intx)size_in_K;
2310
2311 return JNI_OK;
2312 }
2313
2314 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2315 // For match_option to return remaining or value part of option string
2316 const char* tail;
2317
2318 // iterate over arguments
2319 for (int index = 0; index < args->nOptions; index++) {
2320 bool is_absolute_path = false; // for -agentpath vs -agentlib
2321
2322 const JavaVMOption* option = args->options + index;
2323
2324 if (!match_option(option, "-Djava.class.path", &tail) &&
2325 !match_option(option, "-Dsun.java.command", &tail) &&
2326 !match_option(option, "-Dsun.java.launcher", &tail)) {
2327
2328 // add all jvm options to the jvm_args string. This string
2329 // is used later to set the java.vm.args PerfData string constant.
2330 // the -Djava.class.path and the -Dsun.java.command options are
2331 // omitted from jvm_args string as each have their own PerfData
2332 // string constant object.
2333 build_jvm_args(option->optionString);
2334 }
2335
2336 // -verbose:[class/module/gc/jni]
2337 if (match_option(option, "-verbose", &tail)) {
2338 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2339 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2340 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2341 } else if (!strcmp(tail, ":module")) {
2342 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2343 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2344 } else if (!strcmp(tail, ":gc")) {
2345 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2346 } else if (!strcmp(tail, ":jni")) {
2347 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2348 return JNI_EINVAL;
2349 }
2350 }
2351 // -da / -ea / -disableassertions / -enableassertions
2352 // These accept an optional class/package name separated by a colon, e.g.,
2353 // -da:java.lang.Thread.
2354 } else if (match_option(option, user_assertion_options, &tail, true)) {
2355 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2356 if (*tail == '\0') {
2357 JavaAssertions::setUserClassDefault(enable);
2358 } else {
2359 assert(*tail == ':', "bogus match by match_option()");
2360 JavaAssertions::addOption(tail + 1, enable);
2361 }
2362 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2363 } else if (match_option(option, system_assertion_options, &tail, false)) {
2364 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2365 JavaAssertions::setSystemClassDefault(enable);
2366 // -bootclasspath:
2367 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2368 jio_fprintf(defaultStream::output_stream(),
2369 "-Xbootclasspath is no longer a supported option.\n");
2370 return JNI_EINVAL;
2371 // -bootclasspath/a:
2372 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2373 Arguments::append_sysclasspath(tail);
2374 // -bootclasspath/p:
2375 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2376 jio_fprintf(defaultStream::output_stream(),
2377 "-Xbootclasspath/p is no longer a supported option.\n");
2378 return JNI_EINVAL;
2379 // -Xrun
2380 } else if (match_option(option, "-Xrun", &tail)) {
2381 if (tail != NULL) {
2382 const char* pos = strchr(tail, ':');
2383 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2384 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2385 jio_snprintf(name, len + 1, "%s", tail);
2386
2387 char *options = NULL;
2388 if(pos != NULL) {
2389 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2390 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2391 }
2392 #if !INCLUDE_JVMTI
2393 if (strcmp(name, "jdwp") == 0) {
2394 jio_fprintf(defaultStream::error_stream(),
2395 "Debugging agents are not supported in this VM\n");
2396 return JNI_ERR;
2397 }
2398 #endif // !INCLUDE_JVMTI
2399 add_init_library(name, options);
2400 }
2401 } else if (match_option(option, "--add-reads=", &tail)) {
2402 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2403 return JNI_ENOMEM;
2404 }
2405 } else if (match_option(option, "--add-exports=", &tail)) {
2406 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2407 return JNI_ENOMEM;
2408 }
2409 } else if (match_option(option, "--add-opens=", &tail)) {
2410 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2411 return JNI_ENOMEM;
2412 }
2413 } else if (match_option(option, "--add-modules=", &tail)) {
2414 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2415 return JNI_ENOMEM;
2416 }
2417 } else if (match_option(option, "--limit-modules=", &tail)) {
2418 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2419 return JNI_ENOMEM;
2420 }
2421 } else if (match_option(option, "--module-path=", &tail)) {
2422 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2423 return JNI_ENOMEM;
2424 }
2425 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2426 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2427 return JNI_ENOMEM;
2428 }
2429 } else if (match_option(option, "--patch-module=", &tail)) {
2430 // --patch-module=<module>=<file>(<pathsep><file>)*
2431 int res = process_patch_mod_option(tail, patch_mod_javabase);
2432 if (res != JNI_OK) {
2433 return res;
2434 }
2435 } else if (match_option(option, "--illegal-access=", &tail)) {
2436 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2437 return JNI_ENOMEM;
2438 }
2439 // -agentlib and -agentpath
2440 } else if (match_option(option, "-agentlib:", &tail) ||
2441 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2442 if(tail != NULL) {
2443 const char* pos = strchr(tail, '=');
2444 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2445 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2446 name[len] = '\0';
2447
2448 char *options = NULL;
2449 if(pos != NULL) {
2450 options = os::strdup_check_oom(pos + 1, mtArguments);
2451 }
2452 #if !INCLUDE_JVMTI
2453 if (valid_jdwp_agent(name, is_absolute_path)) {
2454 jio_fprintf(defaultStream::error_stream(),
2455 "Debugging agents are not supported in this VM\n");
2456 return JNI_ERR;
2457 }
2458 #endif // !INCLUDE_JVMTI
2459 add_init_agent(name, options, is_absolute_path);
2460 }
2461 // -javaagent
2462 } else if (match_option(option, "-javaagent:", &tail)) {
2463 #if !INCLUDE_JVMTI
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Instrumentation agents are not supported in this VM\n");
2466 return JNI_ERR;
2467 #else
2468 if (tail != NULL) {
2469 size_t length = strlen(tail) + 1;
2470 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2471 jio_snprintf(options, length, "%s", tail);
2472 add_instrument_agent("instrument", options, false);
2473 // java agents need module java.instrument
2474 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2475 return JNI_ENOMEM;
2476 }
2477 }
2478 #endif // !INCLUDE_JVMTI
2479 // --enable_preview
2480 } else if (match_option(option, "--enable-preview")) {
2481 set_enable_preview();
2482 // -Xnoclassgc
2483 } else if (match_option(option, "-Xnoclassgc")) {
2484 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) {
2485 return JNI_EINVAL;
2486 }
2487 // -Xconcgc
2488 } else if (match_option(option, "-Xconcgc")) {
2489 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2490 return JNI_EINVAL;
2491 }
2492 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2493 // -Xnoconcgc
2494 } else if (match_option(option, "-Xnoconcgc")) {
2495 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2496 return JNI_EINVAL;
2497 }
2498 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2499 // -Xbatch
2500 } else if (match_option(option, "-Xbatch")) {
2501 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2502 return JNI_EINVAL;
2503 }
2504 // -Xmn for compatibility with other JVM vendors
2505 } else if (match_option(option, "-Xmn", &tail)) {
2506 julong long_initial_young_size = 0;
2507 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2508 if (errcode != arg_in_range) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Invalid initial young generation size: %s\n", option->optionString);
2511 describe_range_error(errcode);
2512 return JNI_EINVAL;
2513 }
2514 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2515 return JNI_EINVAL;
2516 }
2517 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2518 return JNI_EINVAL;
2519 }
2520 // -Xms
2521 } else if (match_option(option, "-Xms", &tail)) {
2522 julong long_initial_heap_size = 0;
2523 // an initial heap size of 0 means automatically determine
2524 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2525 if (errcode != arg_in_range) {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "Invalid initial heap size: %s\n", option->optionString);
2528 describe_range_error(errcode);
2529 return JNI_EINVAL;
2530 }
2531 set_min_heap_size((size_t)long_initial_heap_size);
2532 // Currently the minimum size and the initial heap sizes are the same.
2533 // Can be overridden with -XX:InitialHeapSize.
2534 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2535 return JNI_EINVAL;
2536 }
2537 // -Xmx
2538 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2539 julong long_max_heap_size = 0;
2540 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2541 if (errcode != arg_in_range) {
2542 jio_fprintf(defaultStream::error_stream(),
2543 "Invalid maximum heap size: %s\n", option->optionString);
2544 describe_range_error(errcode);
2545 return JNI_EINVAL;
2546 }
2547 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2548 return JNI_EINVAL;
2549 }
2550 // Xmaxf
2551 } else if (match_option(option, "-Xmaxf", &tail)) {
2552 char* err;
2553 int maxf = (int)(strtod(tail, &err) * 100);
2554 if (*err != '\0' || *tail == '\0') {
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Bad max heap free percentage size: %s\n",
2557 option->optionString);
2558 return JNI_EINVAL;
2559 } else {
2560 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2561 return JNI_EINVAL;
2562 }
2563 }
2564 // Xminf
2565 } else if (match_option(option, "-Xminf", &tail)) {
2566 char* err;
2567 int minf = (int)(strtod(tail, &err) * 100);
2568 if (*err != '\0' || *tail == '\0') {
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Bad min heap free percentage size: %s\n",
2571 option->optionString);
2572 return JNI_EINVAL;
2573 } else {
2574 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2575 return JNI_EINVAL;
2576 }
2577 }
2578 // -Xss
2579 } else if (match_option(option, "-Xss", &tail)) {
2580 intx value = 0;
2581 jint err = parse_xss(option, tail, &value);
2582 if (err != JNI_OK) {
2583 return err;
2584 }
2585 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) {
2586 return JNI_EINVAL;
2587 }
2588 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2589 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2590 julong long_ReservedCodeCacheSize = 0;
2591
2592 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2593 if (errcode != arg_in_range) {
2594 jio_fprintf(defaultStream::error_stream(),
2595 "Invalid maximum code cache size: %s.\n", option->optionString);
2596 return JNI_EINVAL;
2597 }
2598 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2599 return JNI_EINVAL;
2600 }
2601 // -green
2602 } else if (match_option(option, "-green")) {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Green threads support not available\n");
2605 return JNI_EINVAL;
2606 // -native
2607 } else if (match_option(option, "-native")) {
2608 // HotSpot always uses native threads, ignore silently for compatibility
2609 // -Xrs
2610 } else if (match_option(option, "-Xrs")) {
2611 // Classic/EVM option, new functionality
2612 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2613 return JNI_EINVAL;
2614 }
2615 // -Xprof
2616 } else if (match_option(option, "-Xprof")) {
2617 char version[256];
2618 // Obsolete in JDK 10
2619 JDK_Version::jdk(10).to_string(version, sizeof(version));
2620 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2621 // -Xinternalversion
2622 } else if (match_option(option, "-Xinternalversion")) {
2623 jio_fprintf(defaultStream::output_stream(), "%s\n",
2624 VM_Version::internal_vm_info_string());
2625 vm_exit(0);
2626 #ifndef PRODUCT
2627 // -Xprintflags
2628 } else if (match_option(option, "-Xprintflags")) {
2629 JVMFlag::printFlags(tty, false);
2630 vm_exit(0);
2631 #endif
2632 // -D
2633 } else if (match_option(option, "-D", &tail)) {
2634 const char* value;
2635 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2636 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2637 // abort if -Djava.endorsed.dirs is set
2638 jio_fprintf(defaultStream::output_stream(),
2639 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2640 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2641 return JNI_EINVAL;
2642 }
2643 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2644 *value != '\0' && strcmp(value, "\"\"") != 0) {
2645 // abort if -Djava.ext.dirs is set
2646 jio_fprintf(defaultStream::output_stream(),
2647 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2648 return JNI_EINVAL;
2649 }
2650 // Check for module related properties. They must be set using the modules
2651 // options. For example: use "--add-modules=java.sql", not
2652 // "-Djdk.module.addmods=java.sql"
2653 if (is_internal_module_property(option->optionString + 2)) {
2654 needs_module_property_warning = true;
2655 continue;
2656 }
2657
2658 if (!add_property(tail)) {
2659 return JNI_ENOMEM;
2660 }
2661 // Out of the box management support
2662 if (match_option(option, "-Dcom.sun.management", &tail)) {
2663 #if INCLUDE_MANAGEMENT
2664 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) {
2665 return JNI_EINVAL;
2666 }
2667 // management agent in module jdk.management.agent
2668 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2669 return JNI_ENOMEM;
2670 }
2671 #else
2672 jio_fprintf(defaultStream::output_stream(),
2673 "-Dcom.sun.management is not supported in this VM.\n");
2674 return JNI_ERR;
2675 #endif
2676 }
2677 // -Xint
2678 } else if (match_option(option, "-Xint")) {
2679 set_mode_flags(_int);
2680 // -Xmixed
2681 } else if (match_option(option, "-Xmixed")) {
2682 set_mode_flags(_mixed);
2683 // -Xcomp
2684 } else if (match_option(option, "-Xcomp")) {
2685 // for testing the compiler; turn off all flags that inhibit compilation
2686 set_mode_flags(_comp);
2687 // -Xshare:dump
2688 } else if (match_option(option, "-Xshare:dump")) {
2689 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 set_mode_flags(_int); // Prevent compilation, which creates objects
2693 // -Xshare:on
2694 } else if (match_option(option, "-Xshare:on")) {
2695 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2699 return JNI_EINVAL;
2700 }
2701 // -Xshare:auto
2702 } else if (match_option(option, "-Xshare:auto")) {
2703 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2704 return JNI_EINVAL;
2705 }
2706 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2707 return JNI_EINVAL;
2708 }
2709 // -Xshare:off
2710 } else if (match_option(option, "-Xshare:off")) {
2711 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2715 return JNI_EINVAL;
2716 }
2717 // -Xverify
2718 } else if (match_option(option, "-Xverify", &tail)) {
2719 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2720 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 } else if (strcmp(tail, ":remote") == 0) {
2727 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 } else if (strcmp(tail, ":none") == 0) {
2734 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2735 return JNI_EINVAL;
2736 }
2737 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2738 return JNI_EINVAL;
2739 }
2740 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2741 return JNI_EINVAL;
2742 }
2743 // -Xdebug
2744 } else if (match_option(option, "-Xdebug")) {
2745 // note this flag has been used, then ignore
2746 set_xdebug_mode(true);
2747 // -Xnoagent
2748 } else if (match_option(option, "-Xnoagent")) {
2749 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2750 } else if (match_option(option, "-Xloggc:", &tail)) {
2751 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2752 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2753 _gc_log_filename = os::strdup_check_oom(tail);
2754 } else if (match_option(option, "-Xlog", &tail)) {
2755 bool ret = false;
2756 if (strcmp(tail, ":help") == 0) {
2757 fileStream stream(defaultStream::output_stream());
2758 LogConfiguration::print_command_line_help(&stream);
2759 vm_exit(0);
2760 } else if (strcmp(tail, ":disable") == 0) {
2761 LogConfiguration::disable_logging();
2762 ret = true;
2763 } else if (*tail == '\0') {
2764 ret = LogConfiguration::parse_command_line_arguments();
2765 assert(ret, "-Xlog without arguments should never fail to parse");
2766 } else if (*tail == ':') {
2767 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2768 }
2769 if (ret == false) {
2770 jio_fprintf(defaultStream::error_stream(),
2771 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2772 tail);
2773 return JNI_EINVAL;
2774 }
2775 // JNI hooks
2776 } else if (match_option(option, "-Xcheck", &tail)) {
2777 if (!strcmp(tail, ":jni")) {
2778 #if !INCLUDE_JNI_CHECK
2779 warning("JNI CHECKING is not supported in this VM");
2780 #else
2781 CheckJNICalls = true;
2782 #endif // INCLUDE_JNI_CHECK
2783 } else if (is_bad_option(option, args->ignoreUnrecognized,
2784 "check")) {
2785 return JNI_EINVAL;
2786 }
2787 } else if (match_option(option, "vfprintf")) {
2788 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2789 } else if (match_option(option, "exit")) {
2790 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2791 } else if (match_option(option, "abort")) {
2792 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2793 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2794 // and the last option wins.
2795 } else if (match_option(option, "-XX:+NeverTenure")) {
2796 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) {
2797 return JNI_EINVAL;
2798 }
2799 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2800 return JNI_EINVAL;
2801 }
2802 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2803 return JNI_EINVAL;
2804 }
2805 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2806 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2807 return JNI_EINVAL;
2808 }
2809 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2816 uintx max_tenuring_thresh = 0;
2817 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2818 jio_fprintf(defaultStream::error_stream(),
2819 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2820 return JNI_EINVAL;
2821 }
2822
2823 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2824 return JNI_EINVAL;
2825 }
2826
2827 if (MaxTenuringThreshold == 0) {
2828 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
2832 return JNI_EINVAL;
2833 }
2834 } else {
2835 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
2836 return JNI_EINVAL;
2837 }
2838 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
2839 return JNI_EINVAL;
2840 }
2841 }
2842 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2843 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2844 return JNI_EINVAL;
2845 }
2846 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2847 return JNI_EINVAL;
2848 }
2849 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2850 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2851 return JNI_EINVAL;
2852 }
2853 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2857 #if defined(DTRACE_ENABLED)
2858 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2862 return JNI_EINVAL;
2863 }
2864 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2865 return JNI_EINVAL;
2866 }
2867 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2868 return JNI_EINVAL;
2869 }
2870 #else // defined(DTRACE_ENABLED)
2871 jio_fprintf(defaultStream::error_stream(),
2872 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2873 return JNI_EINVAL;
2874 #endif // defined(DTRACE_ENABLED)
2875 #ifdef ASSERT
2876 } else if (match_option(option, "-XX:+FullGCALot")) {
2877 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 // disable scavenge before parallel mark-compact
2881 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 #endif
2885 #if !INCLUDE_MANAGEMENT
2886 } else if (match_option(option, "-XX:+ManagementServer")) {
2887 jio_fprintf(defaultStream::error_stream(),
2888 "ManagementServer is not supported in this VM.\n");
2889 return JNI_ERR;
2890 #endif // INCLUDE_MANAGEMENT
2891 #if INCLUDE_JFR
2892 } else if (match_jfr_option(&option)) {
2893 return JNI_EINVAL;
2894 #endif
2895 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2896 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2897 // already been handled
2898 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2899 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2900 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2901 return JNI_EINVAL;
2902 }
2903 }
2904 // Unknown option
2905 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2906 return JNI_ERR;
2907 }
2908 }
2909
2910 // PrintSharedArchiveAndExit will turn on
2911 // -Xshare:on
2912 // -Xlog:class+path=info
2913 if (PrintSharedArchiveAndExit) {
2914 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2921 }
2922
2923 // Change the default value for flags which have different default values
2924 // when working with older JDKs.
2925 #ifdef LINUX
2926 if (JDK_Version::current().compare_major(6) <= 0 &&
2927 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2928 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2929 }
2930 #endif // LINUX
2931 fix_appclasspath();
2932
2933 return JNI_OK;
2934 }
2935
2936 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2937 // For java.base check for duplicate --patch-module options being specified on the command line.
2938 // This check is only required for java.base, all other duplicate module specifications
2939 // will be checked during module system initialization. The module system initialization
2940 // will throw an ExceptionInInitializerError if this situation occurs.
2941 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2942 if (*patch_mod_javabase) {
2943 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2944 } else {
2945 *patch_mod_javabase = true;
2946 }
2947 }
2948
2949 // Create GrowableArray lazily, only if --patch-module has been specified
2950 if (_patch_mod_prefix == NULL) {
2951 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
2952 }
2953
2954 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2955 }
2956
2957 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2958 //
2959 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2960 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2961 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2962 // path is treated as the current directory.
2963 //
2964 // This causes problems with CDS, which requires that all directories specified in the classpath
2965 // must be empty. In most cases, applications do NOT want to load classes from the current
2966 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2967 // scripts compatible with CDS.
2968 void Arguments::fix_appclasspath() {
2969 if (IgnoreEmptyClassPaths) {
2970 const char separator = *os::path_separator();
2971 const char* src = _java_class_path->value();
2972
2973 // skip over all the leading empty paths
2974 while (*src == separator) {
2975 src ++;
2976 }
2977
2978 char* copy = os::strdup_check_oom(src, mtArguments);
2979
2980 // trim all trailing empty paths
2981 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2982 *tail = '\0';
2983 }
2984
2985 char from[3] = {separator, separator, '\0'};
2986 char to [2] = {separator, '\0'};
2987 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2988 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2989 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2990 }
2991
2992 _java_class_path->set_writeable_value(copy);
2993 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2994 }
2995 }
2996
2997 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2998 // check if the default lib/endorsed directory exists; if so, error
2999 char path[JVM_MAXPATHLEN];
3000 const char* fileSep = os::file_separator();
3001 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3002
3003 DIR* dir = os::opendir(path);
3004 if (dir != NULL) {
3005 jio_fprintf(defaultStream::output_stream(),
3006 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3007 "in modular form will be supported via the concept of upgradeable modules.\n");
3008 os::closedir(dir);
3009 return JNI_ERR;
3010 }
3011
3012 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3013 dir = os::opendir(path);
3014 if (dir != NULL) {
3015 jio_fprintf(defaultStream::output_stream(),
3016 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3017 "Use -classpath instead.\n.");
3018 os::closedir(dir);
3019 return JNI_ERR;
3020 }
3021
3022 // This must be done after all arguments have been processed
3023 // and the container support has been initialized since AggressiveHeap
3024 // relies on the amount of total memory available.
3025 if (AggressiveHeap) {
3026 jint result = set_aggressive_heap_flags();
3027 if (result != JNI_OK) {
3028 return result;
3029 }
3030 }
3031
3032 // This must be done after all arguments have been processed.
3033 // java_compiler() true means set to "NONE" or empty.
3034 if (java_compiler() && !xdebug_mode()) {
3035 // For backwards compatibility, we switch to interpreted mode if
3036 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3037 // not specified.
3038 set_mode_flags(_int);
3039 }
3040
3041 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3042 // but like -Xint, leave compilation thresholds unaffected.
3043 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3044 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3045 set_mode_flags(_int);
3046 }
3047
3048 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3049 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3050 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3051 }
3052
3053 #if !COMPILER2_OR_JVMCI
3054 // Don't degrade server performance for footprint
3055 if (FLAG_IS_DEFAULT(UseLargePages) &&
3056 MaxHeapSize < LargePageHeapSizeThreshold) {
3057 // No need for large granularity pages w/small heaps.
3058 // Note that large pages are enabled/disabled for both the
3059 // Java heap and the code cache.
3060 FLAG_SET_DEFAULT(UseLargePages, false);
3061 }
3062
3063 UNSUPPORTED_OPTION(ProfileInterpreter);
3064 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3065 #endif
3066
3067 #ifndef TIERED
3068 // Tiered compilation is undefined.
3069 UNSUPPORTED_OPTION(TieredCompilation);
3070 #endif
3071
3072 if (!check_vm_args_consistency()) {
3073 return JNI_ERR;
3074 }
3075
3076 #if INCLUDE_CDS
3077 if (DumpSharedSpaces) {
3078 // Disable biased locking now as it interferes with the clean up of
3079 // the archived Klasses and Java string objects (at dump time only).
3080 UseBiasedLocking = false;
3081
3082 // Always verify non-system classes during CDS dump
3083 if (!BytecodeVerificationRemote) {
3084 BytecodeVerificationRemote = true;
3085 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3086 }
3087
3088 // Compilation is already disabled if the user specifies -Xshare:dump.
3089 // Disable compilation in case user specifies -XX:+DumpSharedSpaces instead of -Xshare:dump.
3090 set_mode_flags(_int);
3091 }
3092 if (UseSharedSpaces && patch_mod_javabase) {
3093 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3094 }
3095 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3096 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3097 }
3098 #endif
3099
3100 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3101 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3102 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3103
3104 return JNI_OK;
3105 }
3106
3107 // Helper class for controlling the lifetime of JavaVMInitArgs
3108 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3109 // deleted on the destruction of the ScopedVMInitArgs object.
3110 class ScopedVMInitArgs : public StackObj {
3111 private:
3112 JavaVMInitArgs _args;
3113 char* _container_name;
3114 bool _is_set;
3115 char* _vm_options_file_arg;
3116
3117 public:
3118 ScopedVMInitArgs(const char *container_name) {
3119 _args.version = JNI_VERSION_1_2;
3120 _args.nOptions = 0;
3121 _args.options = NULL;
3122 _args.ignoreUnrecognized = false;
3123 _container_name = (char *)container_name;
3124 _is_set = false;
3125 _vm_options_file_arg = NULL;
3126 }
3127
3128 // Populates the JavaVMInitArgs object represented by this
3129 // ScopedVMInitArgs object with the arguments in options. The
3130 // allocated memory is deleted by the destructor. If this method
3131 // returns anything other than JNI_OK, then this object is in a
3132 // partially constructed state, and should be abandoned.
3133 jint set_args(GrowableArray<JavaVMOption>* options) {
3134 _is_set = true;
3135 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3136 JavaVMOption, options->length(), mtArguments);
3137 if (options_arr == NULL) {
3138 return JNI_ENOMEM;
3139 }
3140 _args.options = options_arr;
3141
3142 for (int i = 0; i < options->length(); i++) {
3143 options_arr[i] = options->at(i);
3144 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3145 if (options_arr[i].optionString == NULL) {
3146 // Rely on the destructor to do cleanup.
3147 _args.nOptions = i;
3148 return JNI_ENOMEM;
3149 }
3150 }
3151
3152 _args.nOptions = options->length();
3153 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3154 return JNI_OK;
3155 }
3156
3157 JavaVMInitArgs* get() { return &_args; }
3158 char* container_name() { return _container_name; }
3159 bool is_set() { return _is_set; }
3160 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3161 char* vm_options_file_arg() { return _vm_options_file_arg; }
3162
3163 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3164 if (_vm_options_file_arg != NULL) {
3165 os::free(_vm_options_file_arg);
3166 }
3167 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3168 }
3169
3170 ~ScopedVMInitArgs() {
3171 if (_vm_options_file_arg != NULL) {
3172 os::free(_vm_options_file_arg);
3173 }
3174 if (_args.options == NULL) return;
3175 for (int i = 0; i < _args.nOptions; i++) {
3176 os::free(_args.options[i].optionString);
3177 }
3178 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3179 }
3180
3181 // Insert options into this option list, to replace option at
3182 // vm_options_file_pos (-XX:VMOptionsFile)
3183 jint insert(const JavaVMInitArgs* args,
3184 const JavaVMInitArgs* args_to_insert,
3185 const int vm_options_file_pos) {
3186 assert(_args.options == NULL, "shouldn't be set yet");
3187 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3188 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3189
3190 int length = args->nOptions + args_to_insert->nOptions - 1;
3191 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3192 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3193 for (int i = 0; i < args->nOptions; i++) {
3194 if (i == vm_options_file_pos) {
3195 // insert the new options starting at the same place as the
3196 // -XX:VMOptionsFile option
3197 for (int j = 0; j < args_to_insert->nOptions; j++) {
3198 options->push(args_to_insert->options[j]);
3199 }
3200 } else {
3201 options->push(args->options[i]);
3202 }
3203 }
3204 // make into options array
3205 jint result = set_args(options);
3206 delete options;
3207 return result;
3208 }
3209 };
3210
3211 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3212 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3213 }
3214
3215 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3216 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3217 }
3218
3219 jint Arguments::parse_options_environment_variable(const char* name,
3220 ScopedVMInitArgs* vm_args) {
3221 char *buffer = ::getenv(name);
3222
3223 // Don't check this environment variable if user has special privileges
3224 // (e.g. unix su command).
3225 if (buffer == NULL || os::have_special_privileges()) {
3226 return JNI_OK;
3227 }
3228
3229 if ((buffer = os::strdup(buffer)) == NULL) {
3230 return JNI_ENOMEM;
3231 }
3232
3233 jio_fprintf(defaultStream::error_stream(),
3234 "Picked up %s: %s\n", name, buffer);
3235
3236 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3237
3238 os::free(buffer);
3239 return retcode;
3240 }
3241
3242 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3243 // read file into buffer
3244 int fd = ::open(file_name, O_RDONLY);
3245 if (fd < 0) {
3246 jio_fprintf(defaultStream::error_stream(),
3247 "Could not open options file '%s'\n",
3248 file_name);
3249 return JNI_ERR;
3250 }
3251
3252 struct stat stbuf;
3253 int retcode = os::stat(file_name, &stbuf);
3254 if (retcode != 0) {
3255 jio_fprintf(defaultStream::error_stream(),
3256 "Could not stat options file '%s'\n",
3257 file_name);
3258 os::close(fd);
3259 return JNI_ERR;
3260 }
3261
3262 if (stbuf.st_size == 0) {
3263 // tell caller there is no option data and that is ok
3264 os::close(fd);
3265 return JNI_OK;
3266 }
3267
3268 // '+ 1' for NULL termination even with max bytes
3269 size_t bytes_alloc = stbuf.st_size + 1;
3270
3271 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3272 if (NULL == buf) {
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Could not allocate read buffer for options file parse\n");
3275 os::close(fd);
3276 return JNI_ENOMEM;
3277 }
3278
3279 memset(buf, 0, bytes_alloc);
3280
3281 // Fill buffer
3282 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3283 os::close(fd);
3284 if (bytes_read < 0) {
3285 FREE_C_HEAP_ARRAY(char, buf);
3286 jio_fprintf(defaultStream::error_stream(),
3287 "Could not read options file '%s'\n", file_name);
3288 return JNI_ERR;
3289 }
3290
3291 if (bytes_read == 0) {
3292 // tell caller there is no option data and that is ok
3293 FREE_C_HEAP_ARRAY(char, buf);
3294 return JNI_OK;
3295 }
3296
3297 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3298
3299 FREE_C_HEAP_ARRAY(char, buf);
3300 return retcode;
3301 }
3302
3303 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3304 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3305
3306 // some pointers to help with parsing
3307 char *buffer_end = buffer + buf_len;
3308 char *opt_hd = buffer;
3309 char *wrt = buffer;
3310 char *rd = buffer;
3311
3312 // parse all options
3313 while (rd < buffer_end) {
3314 // skip leading white space from the input string
3315 while (rd < buffer_end && isspace(*rd)) {
3316 rd++;
3317 }
3318
3319 if (rd >= buffer_end) {
3320 break;
3321 }
3322
3323 // Remember this is where we found the head of the token.
3324 opt_hd = wrt;
3325
3326 // Tokens are strings of non white space characters separated
3327 // by one or more white spaces.
3328 while (rd < buffer_end && !isspace(*rd)) {
3329 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3330 int quote = *rd; // matching quote to look for
3331 rd++; // don't copy open quote
3332 while (rd < buffer_end && *rd != quote) {
3333 // include everything (even spaces)
3334 // up until the close quote
3335 *wrt++ = *rd++; // copy to option string
3336 }
3337
3338 if (rd < buffer_end) {
3339 rd++; // don't copy close quote
3340 } else {
3341 // did not see closing quote
3342 jio_fprintf(defaultStream::error_stream(),
3343 "Unmatched quote in %s\n", name);
3344 delete options;
3345 return JNI_ERR;
3346 }
3347 } else {
3348 *wrt++ = *rd++; // copy to option string
3349 }
3350 }
3351
3352 // steal a white space character and set it to NULL
3353 *wrt++ = '\0';
3354 // We now have a complete token
3355
3356 JavaVMOption option;
3357 option.optionString = opt_hd;
3358 option.extraInfo = NULL;
3359
3360 options->append(option); // Fill in option
3361
3362 rd++; // Advance to next character
3363 }
3364
3365 // Fill out JavaVMInitArgs structure.
3366 jint status = vm_args->set_args(options);
3367
3368 delete options;
3369 return status;
3370 }
3371
3372 void Arguments::set_shared_spaces_flags() {
3373 if (DumpSharedSpaces) {
3374 if (FailOverToOldVerifier) {
3375 // Don't fall back to the old verifier on verification failure. If a
3376 // class fails verification with the split verifier, it might fail the
3377 // CDS runtime verifier constraint check. In that case, we don't want
3378 // to share the class. We only archive classes that pass the split verifier.
3379 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3380 }
3381
3382 if (RequireSharedSpaces) {
3383 warning("Cannot dump shared archive while using shared archive");
3384 }
3385 UseSharedSpaces = false;
3386 #ifdef _LP64
3387 if (!UseCompressedOops || !UseCompressedClassPointers) {
3388 vm_exit_during_initialization(
3389 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3390 }
3391 } else {
3392 if (!UseCompressedOops || !UseCompressedClassPointers) {
3393 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3394 }
3395 #endif
3396 }
3397 }
3398
3399 // Sharing support
3400 // Construct the path to the archive
3401 char* Arguments::get_default_shared_archive_path() {
3402 char *default_archive_path;
3403 char jvm_path[JVM_MAXPATHLEN];
3404 os::jvm_path(jvm_path, sizeof(jvm_path));
3405 char *end = strrchr(jvm_path, *os::file_separator());
3406 if (end != NULL) *end = '\0';
3407 size_t jvm_path_len = strlen(jvm_path);
3408 size_t file_sep_len = strlen(os::file_separator());
3409 const size_t len = jvm_path_len + file_sep_len + 20;
3410 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3411 if (default_archive_path != NULL) {
3412 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3413 jvm_path, os::file_separator());
3414 }
3415 return default_archive_path;
3416 }
3417
3418 static char* get_shared_archive_path() {
3419 char *shared_archive_path;
3420 if (SharedArchiveFile == NULL) {
3421 shared_archive_path = Arguments::get_default_shared_archive_path();
3422 } else {
3423 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3424 }
3425 return shared_archive_path;
3426 }
3427
3428 #ifndef PRODUCT
3429 // Determine whether LogVMOutput should be implicitly turned on.
3430 static bool use_vm_log() {
3431 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3432 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3433 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3434 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3435 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3436 return true;
3437 }
3438
3439 #ifdef COMPILER1
3440 if (PrintC1Statistics) {
3441 return true;
3442 }
3443 #endif // COMPILER1
3444
3445 #ifdef COMPILER2
3446 if (PrintOptoAssembly || PrintOptoStatistics) {
3447 return true;
3448 }
3449 #endif // COMPILER2
3450
3451 return false;
3452 }
3453
3454 #endif // PRODUCT
3455
3456 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3457 for (int index = 0; index < args->nOptions; index++) {
3458 const JavaVMOption* option = args->options + index;
3459 const char* tail;
3460 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3461 return true;
3462 }
3463 }
3464 return false;
3465 }
3466
3467 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3468 const char* vm_options_file,
3469 const int vm_options_file_pos,
3470 ScopedVMInitArgs* vm_options_file_args,
3471 ScopedVMInitArgs* args_out) {
3472 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3473 if (code != JNI_OK) {
3474 return code;
3475 }
3476
3477 if (vm_options_file_args->get()->nOptions < 1) {
3478 return JNI_OK;
3479 }
3480
3481 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3482 jio_fprintf(defaultStream::error_stream(),
3483 "A VM options file may not refer to a VM options file. "
3484 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3485 "options file '%s' in options container '%s' is an error.\n",
3486 vm_options_file_args->vm_options_file_arg(),
3487 vm_options_file_args->container_name());
3488 return JNI_EINVAL;
3489 }
3490
3491 return args_out->insert(args, vm_options_file_args->get(),
3492 vm_options_file_pos);
3493 }
3494
3495 // Expand -XX:VMOptionsFile found in args_in as needed.
3496 // mod_args and args_out parameters may return values as needed.
3497 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3498 ScopedVMInitArgs* mod_args,
3499 JavaVMInitArgs** args_out) {
3500 jint code = match_special_option_and_act(args_in, mod_args);
3501 if (code != JNI_OK) {
3502 return code;
3503 }
3504
3505 if (mod_args->is_set()) {
3506 // args_in contains -XX:VMOptionsFile and mod_args contains the
3507 // original options from args_in along with the options expanded
3508 // from the VMOptionsFile. Return a short-hand to the caller.
3509 *args_out = mod_args->get();
3510 } else {
3511 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3512 }
3513 return JNI_OK;
3514 }
3515
3516 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3517 ScopedVMInitArgs* args_out) {
3518 // Remaining part of option string
3519 const char* tail;
3520 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3521
3522 for (int index = 0; index < args->nOptions; index++) {
3523 const JavaVMOption* option = args->options + index;
3524 if (match_option(option, "-XX:Flags=", &tail)) {
3525 Arguments::set_jvm_flags_file(tail);
3526 continue;
3527 }
3528 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3529 if (vm_options_file_args.found_vm_options_file_arg()) {
3530 jio_fprintf(defaultStream::error_stream(),
3531 "The option '%s' is already specified in the options "
3532 "container '%s' so the specification of '%s' in the "
3533 "same options container is an error.\n",
3534 vm_options_file_args.vm_options_file_arg(),
3535 vm_options_file_args.container_name(),
3536 option->optionString);
3537 return JNI_EINVAL;
3538 }
3539 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3540 // If there's a VMOptionsFile, parse that
3541 jint code = insert_vm_options_file(args, tail, index,
3542 &vm_options_file_args, args_out);
3543 if (code != JNI_OK) {
3544 return code;
3545 }
3546 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3547 if (args_out->is_set()) {
3548 // The VMOptions file inserted some options so switch 'args'
3549 // to the new set of options, and continue processing which
3550 // preserves "last option wins" semantics.
3551 args = args_out->get();
3552 // The first option from the VMOptionsFile replaces the
3553 // current option. So we back track to process the
3554 // replacement option.
3555 index--;
3556 }
3557 continue;
3558 }
3559 if (match_option(option, "-XX:+PrintVMOptions")) {
3560 PrintVMOptions = true;
3561 continue;
3562 }
3563 if (match_option(option, "-XX:-PrintVMOptions")) {
3564 PrintVMOptions = false;
3565 continue;
3566 }
3567 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3568 IgnoreUnrecognizedVMOptions = true;
3569 continue;
3570 }
3571 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3572 IgnoreUnrecognizedVMOptions = false;
3573 continue;
3574 }
3575 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3576 JVMFlag::printFlags(tty, false);
3577 vm_exit(0);
3578 }
3579 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3580 #if INCLUDE_NMT
3581 // The launcher did not setup nmt environment variable properly.
3582 if (!MemTracker::check_launcher_nmt_support(tail)) {
3583 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3584 }
3585
3586 // Verify if nmt option is valid.
3587 if (MemTracker::verify_nmt_option()) {
3588 // Late initialization, still in single-threaded mode.
3589 if (MemTracker::tracking_level() >= NMT_summary) {
3590 MemTracker::init();
3591 }
3592 } else {
3593 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3594 }
3595 continue;
3596 #else
3597 jio_fprintf(defaultStream::error_stream(),
3598 "Native Memory Tracking is not supported in this VM\n");
3599 return JNI_ERR;
3600 #endif
3601 }
3602
3603 #ifndef PRODUCT
3604 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3605 JVMFlag::printFlags(tty, true);
3606 vm_exit(0);
3607 }
3608 #endif
3609 }
3610 return JNI_OK;
3611 }
3612
3613 static void print_options(const JavaVMInitArgs *args) {
3614 const char* tail;
3615 for (int index = 0; index < args->nOptions; index++) {
3616 const JavaVMOption *option = args->options + index;
3617 if (match_option(option, "-XX:", &tail)) {
3618 logOption(tail);
3619 }
3620 }
3621 }
3622
3623 bool Arguments::handle_deprecated_print_gc_flags() {
3624 if (PrintGC) {
3625 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3626 }
3627 if (PrintGCDetails) {
3628 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3629 }
3630
3631 if (_gc_log_filename != NULL) {
3632 // -Xloggc was used to specify a filename
3633 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3634
3635 LogTarget(Error, logging) target;
3636 LogStream errstream(target);
3637 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3638 } else if (PrintGC || PrintGCDetails) {
3639 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3640 }
3641 return true;
3642 }
3643
3644 void Arguments::handle_extra_cms_flags(const char* msg) {
3645 SpecialFlag flag;
3646 const char *flag_name = "UseConcMarkSweepGC";
3647 if (lookup_special_flag(flag_name, flag)) {
3648 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3649 warning("%s", msg);
3650 }
3651 }
3652
3653 // Parse entry point called from JNI_CreateJavaVM
3654
3655 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3656 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3657
3658 // Initialize ranges, constraints and writeables
3659 JVMFlagRangeList::init();
3660 JVMFlagConstraintList::init();
3661 JVMFlagWriteableList::init();
3662
3663 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3664 const char* hotspotrc = ".hotspotrc";
3665 bool settings_file_specified = false;
3666 bool needs_hotspotrc_warning = false;
3667 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3668 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3669
3670 // Pointers to current working set of containers
3671 JavaVMInitArgs* cur_cmd_args;
3672 JavaVMInitArgs* cur_java_options_args;
3673 JavaVMInitArgs* cur_java_tool_options_args;
3674
3675 // Containers for modified/expanded options
3676 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3677 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3678 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3679
3680
3681 jint code =
3682 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3683 if (code != JNI_OK) {
3684 return code;
3685 }
3686
3687 code = parse_java_options_environment_variable(&initial_java_options_args);
3688 if (code != JNI_OK) {
3689 return code;
3690 }
3691
3692 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3693 &mod_java_tool_options_args,
3694 &cur_java_tool_options_args);
3695 if (code != JNI_OK) {
3696 return code;
3697 }
3698
3699 code = expand_vm_options_as_needed(initial_cmd_args,
3700 &mod_cmd_args,
3701 &cur_cmd_args);
3702 if (code != JNI_OK) {
3703 return code;
3704 }
3705
3706 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3707 &mod_java_options_args,
3708 &cur_java_options_args);
3709 if (code != JNI_OK) {
3710 return code;
3711 }
3712
3713 const char* flags_file = Arguments::get_jvm_flags_file();
3714 settings_file_specified = (flags_file != NULL);
3715
3716 if (IgnoreUnrecognizedVMOptions) {
3717 cur_cmd_args->ignoreUnrecognized = true;
3718 cur_java_tool_options_args->ignoreUnrecognized = true;
3719 cur_java_options_args->ignoreUnrecognized = true;
3720 }
3721
3722 // Parse specified settings file
3723 if (settings_file_specified) {
3724 if (!process_settings_file(flags_file, true,
3725 cur_cmd_args->ignoreUnrecognized)) {
3726 return JNI_EINVAL;
3727 }
3728 } else {
3729 #ifdef ASSERT
3730 // Parse default .hotspotrc settings file
3731 if (!process_settings_file(".hotspotrc", false,
3732 cur_cmd_args->ignoreUnrecognized)) {
3733 return JNI_EINVAL;
3734 }
3735 #else
3736 struct stat buf;
3737 if (os::stat(hotspotrc, &buf) == 0) {
3738 needs_hotspotrc_warning = true;
3739 }
3740 #endif
3741 }
3742
3743 if (PrintVMOptions) {
3744 print_options(cur_java_tool_options_args);
3745 print_options(cur_cmd_args);
3746 print_options(cur_java_options_args);
3747 }
3748
3749 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3750 jint result = parse_vm_init_args(cur_java_tool_options_args,
3751 cur_java_options_args,
3752 cur_cmd_args);
3753
3754 if (result != JNI_OK) {
3755 return result;
3756 }
3757
3758 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3759 SharedArchivePath = get_shared_archive_path();
3760 if (SharedArchivePath == NULL) {
3761 return JNI_ENOMEM;
3762 }
3763
3764 // Set up VerifySharedSpaces
3765 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3766 VerifySharedSpaces = true;
3767 }
3768
3769 // Delay warning until here so that we've had a chance to process
3770 // the -XX:-PrintWarnings flag
3771 if (needs_hotspotrc_warning) {
3772 warning("%s file is present but has been ignored. "
3773 "Run with -XX:Flags=%s to load the file.",
3774 hotspotrc, hotspotrc);
3775 }
3776
3777 if (needs_module_property_warning) {
3778 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3779 " names that are reserved for internal use.");
3780 }
3781
3782 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3783 UNSUPPORTED_OPTION(UseLargePages);
3784 #endif
3785
3786 #if defined(AIX)
3787 UNSUPPORTED_OPTION(AllocateHeapAt);
3788 UNSUPPORTED_OPTION(AllocateOldGenAt);
3789 #endif
3790
3791 #ifndef PRODUCT
3792 if (TraceBytecodesAt != 0) {
3793 TraceBytecodes = true;
3794 }
3795 if (CountCompiledCalls) {
3796 if (UseCounterDecay) {
3797 warning("UseCounterDecay disabled because CountCalls is set");
3798 UseCounterDecay = false;
3799 }
3800 }
3801 #endif // PRODUCT
3802
3803 if (ScavengeRootsInCode == 0) {
3804 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3805 warning("Forcing ScavengeRootsInCode non-zero");
3806 }
3807 ScavengeRootsInCode = 1;
3808 }
3809
3810 if (!handle_deprecated_print_gc_flags()) {
3811 return JNI_EINVAL;
3812 }
3813
3814 // Set object alignment values.
3815 set_object_alignment();
3816
3817 #if !INCLUDE_CDS
3818 if (DumpSharedSpaces || RequireSharedSpaces) {
3819 jio_fprintf(defaultStream::error_stream(),
3820 "Shared spaces are not supported in this VM\n");
3821 return JNI_ERR;
3822 }
3823 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
3824 log_is_enabled(Info, cds)) {
3825 warning("Shared spaces are not supported in this VM");
3826 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3827 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3828 }
3829 no_shared_spaces("CDS Disabled");
3830 #endif // INCLUDE_CDS
3831
3832 return JNI_OK;
3833 }
3834
3835 jint Arguments::apply_ergo() {
3836 // Set flags based on ergonomics.
3837 jint result = set_ergonomics_flags();
3838 if (result != JNI_OK) return result;
3839
3840 // Set heap size based on available physical memory
3841 set_heap_size();
3842
3843 GCConfig::arguments()->initialize();
3844
3845 set_shared_spaces_flags();
3846
3847 // Initialize Metaspace flags and alignments
3848 Metaspace::ergo_initialize();
3849
3850 // Set compiler flags after GC is selected and GC specific
3851 // flags (LoopStripMiningIter) are set.
3852 CompilerConfig::ergo_initialize();
3853
3854 // Set bytecode rewriting flags
3855 set_bytecode_flags();
3856
3857 // Set flags if aggressive optimization flags are enabled
3858 jint code = set_aggressive_opts_flags();
3859 if (code != JNI_OK) {
3860 return code;
3861 }
3862
3863 // Turn off biased locking for locking debug mode flags,
3864 // which are subtly different from each other but neither works with
3865 // biased locking
3866 if (UseHeavyMonitors
3867 #ifdef COMPILER1
3868 || !UseFastLocking
3869 #endif // COMPILER1
3870 #if INCLUDE_JVMCI
3871 || !JVMCIUseFastLocking
3872 #endif
3873 ) {
3874 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3875 // flag set to true on command line; warn the user that they
3876 // can't enable biased locking here
3877 warning("Biased Locking is not supported with locking debug flags"
3878 "; ignoring UseBiasedLocking flag." );
3879 }
3880 UseBiasedLocking = false;
3881 }
3882
3883 #ifdef CC_INTERP
3884 // Clear flags not supported on zero.
3885 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3886 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3887 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3888 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3889 #endif // CC_INTERP
3890
3891 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3892 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3893 DebugNonSafepoints = true;
3894 }
3895
3896 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3897 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3898 }
3899
3900 #ifndef PRODUCT
3901 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3902 if (use_vm_log()) {
3903 LogVMOutput = true;
3904 }
3905 }
3906 #endif // PRODUCT
3907
3908 if (PrintCommandLineFlags) {
3909 JVMFlag::printSetFlags(tty);
3910 }
3911
3912 // Apply CPU specific policy for the BiasedLocking
3913 if (UseBiasedLocking) {
3914 if (!VM_Version::use_biased_locking() &&
3915 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3916 UseBiasedLocking = false;
3917 }
3918 }
3919 #ifdef COMPILER2
3920 if (!UseBiasedLocking) {
3921 UseOptoBiasInlining = false;
3922 }
3923 #endif
3924
3925 #if defined(IA32)
3926 // Only server compiler can optimize safepoints well enough.
3927 if (!is_server_compilation_mode_vm()) {
3928 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
3929 }
3930 #endif
3931
3932 // ThreadLocalHandshakesConstraintFunc handles the constraints.
3933 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
3934 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
3935 } else {
3936 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
3937 }
3938
3939 return JNI_OK;
3940 }
3941
3942 jint Arguments::adjust_after_os() {
3943 if (UseNUMA) {
3944 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
3945 FLAG_SET_ERGO(bool, UseNUMA, false);
3946 } else if (UseParallelGC || UseParallelOldGC) {
3947 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3948 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3949 }
3950 }
3951 // UseNUMAInterleaving is set to ON for all collectors and
3952 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3953 // such as the parallel collector for Linux and Solaris will
3954 // interleave old gen and survivor spaces on top of NUMA
3955 // allocation policy for the eden space.
3956 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3957 // all platforms and ParallelGC on Windows will interleave all
3958 // of the heap spaces across NUMA nodes.
3959 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3960 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3961 }
3962 }
3963 return JNI_OK;
3964 }
3965
3966 int Arguments::PropertyList_count(SystemProperty* pl) {
3967 int count = 0;
3968 while(pl != NULL) {
3969 count++;
3970 pl = pl->next();
3971 }
3972 return count;
3973 }
3974
3975 // Return the number of readable properties.
3976 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3977 int count = 0;
3978 while(pl != NULL) {
3979 if (pl->is_readable()) {
3980 count++;
3981 }
3982 pl = pl->next();
3983 }
3984 return count;
3985 }
3986
3987 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3988 assert(key != NULL, "just checking");
3989 SystemProperty* prop;
3990 for (prop = pl; prop != NULL; prop = prop->next()) {
3991 if (strcmp(key, prop->key()) == 0) return prop->value();
3992 }
3993 return NULL;
3994 }
3995
3996 // Return the value of the requested property provided that it is a readable property.
3997 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3998 assert(key != NULL, "just checking");
3999 SystemProperty* prop;
4000 // Return the property value if the keys match and the property is not internal or
4001 // it's the special internal property "jdk.boot.class.path.append".
4002 for (prop = pl; prop != NULL; prop = prop->next()) {
4003 if (strcmp(key, prop->key()) == 0) {
4004 if (!prop->internal()) {
4005 return prop->value();
4006 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4007 return prop->value();
4008 } else {
4009 // Property is internal and not jdk.boot.class.path.append so return NULL.
4010 return NULL;
4011 }
4012 }
4013 }
4014 return NULL;
4015 }
4016
4017 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4018 int count = 0;
4019 const char* ret_val = NULL;
4020
4021 while(pl != NULL) {
4022 if(count >= index) {
4023 ret_val = pl->key();
4024 break;
4025 }
4026 count++;
4027 pl = pl->next();
4028 }
4029
4030 return ret_val;
4031 }
4032
4033 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4034 int count = 0;
4035 char* ret_val = NULL;
4036
4037 while(pl != NULL) {
4038 if(count >= index) {
4039 ret_val = pl->value();
4040 break;
4041 }
4042 count++;
4043 pl = pl->next();
4044 }
4045
4046 return ret_val;
4047 }
4048
4049 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4050 SystemProperty* p = *plist;
4051 if (p == NULL) {
4052 *plist = new_p;
4053 } else {
4054 while (p->next() != NULL) {
4055 p = p->next();
4056 }
4057 p->set_next(new_p);
4058 }
4059 }
4060
4061 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4062 bool writeable, bool internal) {
4063 if (plist == NULL)
4064 return;
4065
4066 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4067 PropertyList_add(plist, new_p);
4068 }
4069
4070 void Arguments::PropertyList_add(SystemProperty *element) {
4071 PropertyList_add(&_system_properties, element);
4072 }
4073
4074 // This add maintains unique property key in the list.
4075 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4076 PropertyAppendable append, PropertyWriteable writeable,
4077 PropertyInternal internal) {
4078 if (plist == NULL)
4079 return;
4080
4081 // If property key exist then update with new value.
4082 SystemProperty* prop;
4083 for (prop = *plist; prop != NULL; prop = prop->next()) {
4084 if (strcmp(k, prop->key()) == 0) {
4085 if (append == AppendProperty) {
4086 prop->append_value(v);
4087 } else {
4088 prop->set_value(v);
4089 }
4090 return;
4091 }
4092 }
4093
4094 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4095 }
4096
4097 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4098 // Returns true if all of the source pointed by src has been copied over to
4099 // the destination buffer pointed by buf. Otherwise, returns false.
4100 // Notes:
4101 // 1. If the length (buflen) of the destination buffer excluding the
4102 // NULL terminator character is not long enough for holding the expanded
4103 // pid characters, it also returns false instead of returning the partially
4104 // expanded one.
4105 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4106 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4107 char* buf, size_t buflen) {
4108 const char* p = src;
4109 char* b = buf;
4110 const char* src_end = &src[srclen];
4111 char* buf_end = &buf[buflen - 1];
4112
4113 while (p < src_end && b < buf_end) {
4114 if (*p == '%') {
4115 switch (*(++p)) {
4116 case '%': // "%%" ==> "%"
4117 *b++ = *p++;
4118 break;
4119 case 'p': { // "%p" ==> current process id
4120 // buf_end points to the character before the last character so
4121 // that we could write '\0' to the end of the buffer.
4122 size_t buf_sz = buf_end - b + 1;
4123 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4124
4125 // if jio_snprintf fails or the buffer is not long enough to hold
4126 // the expanded pid, returns false.
4127 if (ret < 0 || ret >= (int)buf_sz) {
4128 return false;
4129 } else {
4130 b += ret;
4131 assert(*b == '\0', "fail in copy_expand_pid");
4132 if (p == src_end && b == buf_end + 1) {
4133 // reach the end of the buffer.
4134 return true;
4135 }
4136 }
4137 p++;
4138 break;
4139 }
4140 default :
4141 *b++ = '%';
4142 }
4143 } else {
4144 *b++ = *p++;
4145 }
4146 }
4147 *b = '\0';
4148 return (p == src_end); // return false if not all of the source was copied
4149 }