1 /*
2 * Copyright (c) 1997, 2017, 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/gcArguments.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "logging/logStream.hpp"
39 #include "logging/logTag.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/universe.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/arguments_ext.hpp"
46 #include "runtime/commandLineFlagConstraintList.hpp"
47 #include "runtime/commandLineFlagWriteableList.hpp"
48 #include "runtime/commandLineFlagRangeList.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/globals_extension.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/safepointMechanism.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/management.hpp"
56 #include "services/memTracker.hpp"
57 #include "utilities/align.hpp"
58 #include "utilities/defaultStream.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/stringUtils.hpp"
61 #if INCLUDE_JVMCI
62 #include "jvmci/jvmciRuntime.hpp"
63 #endif
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 char* Arguments::_jvm_flags_file = NULL;
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 size_t Arguments::_conservative_max_heap_alignment = 0;
78 size_t Arguments::_min_heap_size = 0;
79 Arguments::Mode Arguments::_mode = _mixed;
80 bool Arguments::_java_compiler = false;
81 bool Arguments::_xdebug_mode = false;
82 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
83 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
84 int Arguments::_sun_java_launcher_pid = -1;
85 bool Arguments::_sun_java_launcher_is_altjvm = false;
86
87 // These parameters are reset in method parse_vm_init_args()
88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
90 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
91 bool Arguments::_ClipInlining = ClipInlining;
92 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
93 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
94
95 char* Arguments::SharedArchivePath = NULL;
96
97 AgentLibraryList Arguments::_libraryList;
98 AgentLibraryList Arguments::_agentList;
99
100 abort_hook_t Arguments::_abort_hook = NULL;
101 exit_hook_t Arguments::_exit_hook = NULL;
102 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
103
104
105 SystemProperty *Arguments::_sun_boot_library_path = NULL;
106 SystemProperty *Arguments::_java_library_path = NULL;
107 SystemProperty *Arguments::_java_home = NULL;
108 SystemProperty *Arguments::_java_class_path = NULL;
109 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
110
111 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
112 PathString *Arguments::_system_boot_class_path = NULL;
113 bool Arguments::_has_jimage = false;
114
115 char* Arguments::_ext_dirs = NULL;
116
117 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
118 // part of the option string.
119 static bool match_option(const JavaVMOption *option, const char* name,
120 const char** tail) {
121 size_t len = strlen(name);
122 if (strncmp(option->optionString, name, len) == 0) {
123 *tail = option->optionString + len;
124 return true;
125 } else {
126 return false;
127 }
128 }
129
130 // Check if 'option' matches 'name'. No "tail" is allowed.
131 static bool match_option(const JavaVMOption *option, const char* name) {
132 const char* tail = NULL;
133 bool result = match_option(option, name, &tail);
134 if (tail != NULL && *tail == '\0') {
135 return result;
136 } else {
137 return false;
138 }
139 }
140
141 // Return true if any of the strings in null-terminated array 'names' matches.
142 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
143 // the option must match exactly.
144 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
145 bool tail_allowed) {
146 for (/* empty */; *names != NULL; ++names) {
147 if (match_option(option, *names, tail)) {
148 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
149 return true;
150 }
151 }
152 }
153 return false;
154 }
155
156 static void logOption(const char* opt) {
157 if (PrintVMOptions) {
158 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
159 }
160 }
161
162 bool needs_module_property_warning = false;
163
164 #define MODULE_PROPERTY_PREFIX "jdk.module."
165 #define MODULE_PROPERTY_PREFIX_LEN 11
166 #define ADDEXPORTS "addexports"
167 #define ADDEXPORTS_LEN 10
168 #define ADDREADS "addreads"
169 #define ADDREADS_LEN 8
170 #define ADDOPENS "addopens"
171 #define ADDOPENS_LEN 8
172 #define PATCH "patch"
173 #define PATCH_LEN 5
174 #define ADDMODS "addmods"
175 #define ADDMODS_LEN 7
176 #define LIMITMODS "limitmods"
177 #define LIMITMODS_LEN 9
178 #define PATH "path"
179 #define PATH_LEN 4
180 #define UPGRADE_PATH "upgrade.path"
181 #define UPGRADE_PATH_LEN 12
182
183 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
184 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
185 return ((strncmp(option, property, len) == 0) &&
186 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
187 }
188
189 // Return true if property starts with "jdk.module." and its ensuing chars match
190 // any of the reserved module properties.
191 // property should be passed without the leading "-D".
192 bool Arguments::is_internal_module_property(const char* property) {
193 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
194 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
195 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
196 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
197 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
198 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
199 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
200 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
201 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
202 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
203 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
204 return true;
205 }
206 }
207 return false;
208 }
209
210 // Process java launcher properties.
211 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
212 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
213 // sun.java.launcher.pid is defined.
214 // Must do this before setting up other system properties,
215 // as some of them may depend on launcher type.
216 for (int index = 0; index < args->nOptions; index++) {
217 const JavaVMOption* option = args->options + index;
218 const char* tail;
219
220 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
221 process_java_launcher_argument(tail, option->extraInfo);
222 continue;
223 }
224 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
225 if (strcmp(tail, "true") == 0) {
226 _sun_java_launcher_is_altjvm = true;
227 }
228 continue;
229 }
230 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
231 _sun_java_launcher_pid = atoi(tail);
232 continue;
233 }
234 }
235 }
236
237 // Initialize system properties key and value.
238 void Arguments::init_system_properties() {
239
240 // Set up _system_boot_class_path which is not a property but
241 // relies heavily on argument processing and the jdk.boot.class.path.append
242 // property. It is used to store the underlying system boot class path.
243 _system_boot_class_path = new PathString(NULL);
244
245 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
246 "Java Virtual Machine Specification", false));
247 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
250 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
251
252 // Following are JVMTI agent writable properties.
253 // Properties values are set to NULL and they are
254 // os specific they are initialized in os::init_system_properties_values().
255 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
256 _java_library_path = new SystemProperty("java.library.path", NULL, true);
257 _java_home = new SystemProperty("java.home", NULL, true);
258 _java_class_path = new SystemProperty("java.class.path", "", true);
259 // jdk.boot.class.path.append is a non-writeable, internal property.
260 // It can only be set by either:
261 // - -Xbootclasspath/a:
262 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
263 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
264
265 // Add to System Property list.
266 PropertyList_add(&_system_properties, _sun_boot_library_path);
267 PropertyList_add(&_system_properties, _java_library_path);
268 PropertyList_add(&_system_properties, _java_home);
269 PropertyList_add(&_system_properties, _java_class_path);
270 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
271
272 // Set OS specific system properties values
273 os::init_system_properties_values();
274 }
275
276 // Update/Initialize System properties after JDK version number is known
277 void Arguments::init_version_specific_system_properties() {
278 enum { bufsz = 16 };
279 char buffer[bufsz];
280 const char* spec_vendor = "Oracle Corporation";
281 uint32_t spec_version = JDK_Version::current().major_version();
282
283 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
284
285 PropertyList_add(&_system_properties,
286 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
287 PropertyList_add(&_system_properties,
288 new SystemProperty("java.vm.specification.version", buffer, false));
289 PropertyList_add(&_system_properties,
290 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
291 }
292
293 /*
294 * -XX argument processing:
295 *
296 * -XX arguments are defined in several places, such as:
297 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
298 * -XX arguments are parsed in parse_argument().
299 * -XX argument bounds checking is done in check_vm_args_consistency().
300 *
301 * Over time -XX arguments may change. There are mechanisms to handle common cases:
302 *
303 * ALIASED: An option that is simply another name for another option. This is often
304 * part of the process of deprecating a flag, but not all aliases need
305 * to be deprecated.
306 *
307 * Create an alias for an option by adding the old and new option names to the
308 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
309 *
310 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
311 * support may be removed in the future. Both regular and aliased options may be
312 * deprecated.
313 *
314 * Add a deprecation warning for an option (or alias) by adding an entry in the
315 * "special_jvm_flags" table and setting the "deprecated_in" field.
316 * Often an option "deprecated" in one major release will
317 * be made "obsolete" in the next. In this case the entry should also have its
318 * "obsolete_in" field set.
319 *
320 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
321 * on the command line. A warning is printed to let the user know that option might not
322 * be accepted in the future.
323 *
324 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
325 * table and setting the "obsolete_in" field.
326 *
327 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
328 * to the current JDK version. The system will flatly refuse to admit the existence of
329 * the flag. This allows a flag to die automatically over JDK releases.
330 *
331 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
332 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
333 * - Newly obsolete or expired deprecated options should have their global variable
334 * definitions removed (from globals.hpp, etc) and related implementations removed.
335 *
336 * Recommended approach for removing options:
337 *
338 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
339 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
340 *
341 * To remove internal options (e.g. diagnostic, experimental, develop options), use
342 * a 2-step model adding major release numbers to the obsolete and expire columns.
343 *
344 * To change the name of an option, use the alias table as well as a 2-step
345 * model adding major release numbers to the deprecate and expire columns.
346 * Think twice about aliasing commonly used customer options.
347 *
348 * There are times when it is appropriate to leave a future release number as undefined.
349 *
350 * Tests: Aliases should be tested in VMAliasOptions.java.
351 * Deprecated options should be tested in VMDeprecatedOptions.java.
352 */
353
354 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
355 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
356 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
357 // the command-line as usual, but will issue a warning.
358 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
359 // the command-line, while issuing a warning and ignoring the flag value.
360 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
361 // existence of the flag.
362 //
363 // MANUAL CLEANUP ON JDK VERSION UPDATES:
364 // This table ensures that the handling of options will update automatically when the JDK
365 // version is incremented, but the source code needs to be cleanup up manually:
366 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
367 // variable should be removed, as well as users of the variable.
368 // - As "deprecated" options age into "obsolete" options, move the entry into the
369 // "Obsolete Flags" section of the table.
370 // - All expired options should be removed from the table.
371 static SpecialFlag const special_jvm_flags[] = {
372 // -------------- Deprecated Flags --------------
373 // --- Non-alias flags - sorted by obsolete_in then expired_in:
374 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
375 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
376 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
377 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
378 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
379 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
380 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
381 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
382 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
383 { "UseCGroupMemoryLimitForHeap", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::jdk(11) },
384 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
385
386 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
387 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
388 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
389 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
390 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
391
392 // -------------- Obsolete Flags - sorted by expired_in --------------
393 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
394 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
395 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
396 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
397 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
398 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
399 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
400 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
401 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
402
403 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
404 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
405 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
406 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
407 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
408 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
409 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
410 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
411 #endif
412
413 { NULL, JDK_Version(0), JDK_Version(0) }
414 };
415
416 // Flags that are aliases for other flags.
417 typedef struct {
418 const char* alias_name;
419 const char* real_name;
420 } AliasedFlag;
421
422 static AliasedFlag const aliased_jvm_flags[] = {
423 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
424 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
425 { NULL, NULL}
426 };
427
428 // NOTE: A compatibility request will be necessary for each alias to be removed.
429 static AliasedLoggingFlag const aliased_logging_flags[] = {
430 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
431 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
432 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
433 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
434 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
435 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
436 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
437 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
438 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
439 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
440 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
441 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
442 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
443 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
444 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
445 };
446
447 #ifndef PRODUCT
448 // These options are removed in jdk9. Remove this code for jdk10.
449 static AliasedFlag const removed_develop_logging_flags[] = {
450 { "TraceClassInitialization", "-Xlog:class+init" },
451 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
452 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
453 { "TraceItables", "-Xlog:itables=debug" },
454 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
455 { "TraceSafepoint", "-Xlog:safepoint=debug" },
456 { "TraceStartupTime", "-Xlog:startuptime" },
457 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
458 { "PrintVtables", "-Xlog:vtables=debug" },
459 { "VerboseVerification", "-Xlog:verification" },
460 { NULL, NULL }
461 };
462 #endif //PRODUCT
463
464 // Return true if "v" is less than "other", where "other" may be "undefined".
465 static bool version_less_than(JDK_Version v, JDK_Version other) {
466 assert(!v.is_undefined(), "must be defined");
467 if (!other.is_undefined() && v.compare(other) >= 0) {
468 return false;
469 } else {
470 return true;
471 }
472 }
473
474 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
475
476 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
477 // Allow extensions to have priority
478 if (lookup_special_flag_ext(flag_name, flag)) {
479 return true;
480 }
481
482 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
483 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
484 flag = special_jvm_flags[i];
485 return true;
486 }
487 }
488 return false;
489 }
490
491 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
492 assert(version != NULL, "Must provide a version buffer");
493 SpecialFlag flag;
494 if (lookup_special_flag(flag_name, flag)) {
495 if (!flag.obsolete_in.is_undefined()) {
496 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
497 *version = flag.obsolete_in;
498 return true;
499 }
500 }
501 }
502 return false;
503 }
504
505 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
506 assert(version != NULL, "Must provide a version buffer");
507 SpecialFlag flag;
508 if (lookup_special_flag(flag_name, flag)) {
509 if (!flag.deprecated_in.is_undefined()) {
510 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
511 version_less_than(JDK_Version::current(), flag.expired_in)) {
512 *version = flag.deprecated_in;
513 return 1;
514 } else {
515 return -1;
516 }
517 }
518 }
519 return 0;
520 }
521
522 #ifndef PRODUCT
523 const char* Arguments::removed_develop_logging_flag_name(const char* name){
524 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
525 const AliasedFlag& flag = removed_develop_logging_flags[i];
526 if (strcmp(flag.alias_name, name) == 0) {
527 return flag.real_name;
528 }
529 }
530 return NULL;
531 }
532 #endif // PRODUCT
533
534 const char* Arguments::real_flag_name(const char *flag_name) {
535 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
536 const AliasedFlag& flag_status = aliased_jvm_flags[i];
537 if (strcmp(flag_status.alias_name, flag_name) == 0) {
538 return flag_status.real_name;
539 }
540 }
541 return flag_name;
542 }
543
544 #ifdef ASSERT
545 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
546 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
547 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
548 return true;
549 }
550 }
551 return false;
552 }
553
554 static bool verify_special_jvm_flags() {
555 bool success = true;
556 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
557 const SpecialFlag& flag = special_jvm_flags[i];
558 if (lookup_special_flag(flag.name, i)) {
559 warning("Duplicate special flag declaration \"%s\"", flag.name);
560 success = false;
561 }
562 if (flag.deprecated_in.is_undefined() &&
563 flag.obsolete_in.is_undefined()) {
564 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
565 success = false;
566 }
567
568 if (!flag.deprecated_in.is_undefined()) {
569 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
570 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
571 success = false;
572 }
573
574 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
575 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
576 success = false;
577 }
578 }
579
580 if (!flag.obsolete_in.is_undefined()) {
581 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
582 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
583 success = false;
584 }
585
586 // if flag has become obsolete it should not have a "globals" flag defined anymore.
587 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
588 if (Flag::find_flag(flag.name) != NULL) {
589 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
590 success = false;
591 }
592 }
593 }
594
595 if (!flag.expired_in.is_undefined()) {
596 // if flag has become expired it should not have a "globals" flag defined anymore.
597 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
598 if (Flag::find_flag(flag.name) != NULL) {
599 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
600 success = false;
601 }
602 }
603 }
604
605 }
606 return success;
607 }
608 #endif
609
610 // Parses a size specification string.
611 bool Arguments::atojulong(const char *s, julong* result) {
612 julong n = 0;
613
614 // First char must be a digit. Don't allow negative numbers or leading spaces.
615 if (!isdigit(*s)) {
616 return false;
617 }
618
619 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
620 char* remainder;
621 errno = 0;
622 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
623 if (errno != 0) {
624 return false;
625 }
626
627 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
628 if (remainder == s || strlen(remainder) > 1) {
629 return false;
630 }
631
632 switch (*remainder) {
633 case 'T': case 't':
634 *result = n * G * K;
635 // Check for overflow.
636 if (*result/((julong)G * K) != n) return false;
637 return true;
638 case 'G': case 'g':
639 *result = n * G;
640 if (*result/G != n) return false;
641 return true;
642 case 'M': case 'm':
643 *result = n * M;
644 if (*result/M != n) return false;
645 return true;
646 case 'K': case 'k':
647 *result = n * K;
648 if (*result/K != n) return false;
649 return true;
650 case '\0':
651 *result = n;
652 return true;
653 default:
654 return false;
655 }
656 }
657
658 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
659 if (size < min_size) return arg_too_small;
660 if (size > max_size) return arg_too_big;
661 return arg_in_range;
662 }
663
664 // Describe an argument out of range error
665 void Arguments::describe_range_error(ArgsRange errcode) {
666 switch(errcode) {
667 case arg_too_big:
668 jio_fprintf(defaultStream::error_stream(),
669 "The specified size exceeds the maximum "
670 "representable size.\n");
671 break;
672 case arg_too_small:
673 case arg_unreadable:
674 case arg_in_range:
675 // do nothing for now
676 break;
677 default:
678 ShouldNotReachHere();
679 }
680 }
681
682 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
683 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
684 return true;
685 } else {
686 return false;
687 }
688 }
689
690 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
691 char* end;
692 errno = 0;
693 double v = strtod(value, &end);
694 if ((errno != 0) || (*end != 0)) {
695 return false;
696 }
697
698 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
699 return true;
700 }
701 return false;
702 }
703
704 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
705 julong v;
706 int int_v;
707 intx intx_v;
708 bool is_neg = false;
709 Flag* result = Flag::find_flag(name, strlen(name));
710
711 if (result == NULL) {
712 return false;
713 }
714
715 // Check the sign first since atojulong() parses only unsigned values.
716 if (*value == '-') {
717 if (!result->is_intx() && !result->is_int()) {
718 return false;
719 }
720 value++;
721 is_neg = true;
722 }
723 if (!Arguments::atojulong(value, &v)) {
724 return false;
725 }
726 if (result->is_int()) {
727 int_v = (int) v;
728 if (is_neg) {
729 int_v = -int_v;
730 }
731 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
732 } else if (result->is_uint()) {
733 uint uint_v = (uint) v;
734 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
735 } else if (result->is_intx()) {
736 intx_v = (intx) v;
737 if (is_neg) {
738 intx_v = -intx_v;
739 }
740 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
741 } else if (result->is_uintx()) {
742 uintx uintx_v = (uintx) v;
743 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
744 } else if (result->is_uint64_t()) {
745 uint64_t uint64_t_v = (uint64_t) v;
746 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
747 } else if (result->is_size_t()) {
748 size_t size_t_v = (size_t) v;
749 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
750 } else if (result->is_double()) {
751 double double_v = (double) v;
752 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
753 } else {
754 return false;
755 }
756 }
757
758 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
759 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
760 // Contract: CommandLineFlags always returns a pointer that needs freeing.
761 FREE_C_HEAP_ARRAY(char, value);
762 return true;
763 }
764
765 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
766 const char* old_value = "";
767 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
768 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
769 size_t new_len = strlen(new_value);
770 const char* value;
771 char* free_this_too = NULL;
772 if (old_len == 0) {
773 value = new_value;
774 } else if (new_len == 0) {
775 value = old_value;
776 } else {
777 size_t length = old_len + 1 + new_len + 1;
778 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
779 // each new setting adds another LINE to the switch:
780 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
781 value = buf;
782 free_this_too = buf;
783 }
784 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
785 // CommandLineFlags always returns a pointer that needs freeing.
786 FREE_C_HEAP_ARRAY(char, value);
787 if (free_this_too != NULL) {
788 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
789 FREE_C_HEAP_ARRAY(char, free_this_too);
790 }
791 return true;
792 }
793
794 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
795 const char* real_name = real_flag_name(arg);
796 JDK_Version since = JDK_Version();
797 switch (is_deprecated_flag(arg, &since)) {
798 case -1:
799 return NULL; // obsolete or expired, don't process normally
800 case 0:
801 return real_name;
802 case 1: {
803 if (warn) {
804 char version[256];
805 since.to_string(version, sizeof(version));
806 if (real_name != arg) {
807 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
808 arg, version, real_name);
809 } else {
810 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
811 arg, version);
812 }
813 }
814 return real_name;
815 }
816 }
817 ShouldNotReachHere();
818 return NULL;
819 }
820
821 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
822 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
823 // Set tagset string buffer at max size of 256, large enough for any alias tagset
824 const int max_tagset_size = 256;
825 int max_tagset_len = max_tagset_size - 1;
826 char tagset_buffer[max_tagset_size];
827 tagset_buffer[0] = '\0';
828
829 // Write tag-set for aliased logging option, in string list form
830 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
831 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
832 if (i > 0) {
833 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
834 }
835 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
836 }
837 if (!alf.exactMatch) {
838 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
839 }
840 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
841 (on) ? "+" : "-",
842 name,
843 tagset_buffer,
844 (on) ? LogLevel::name(alf.level) : "off");
845 }
846
847 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
848 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
849 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
850 if (strcmp(alf.alias_name, name) == 0) {
851 log_deprecated_flag(name, on, alf);
852 return alf;
853 }
854 }
855 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
856 return a;
857 }
858
859 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
860
861 // range of acceptable characters spelled out for portability reasons
862 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
863 #define BUFLEN 255
864 char name[BUFLEN+1];
865 char dummy;
866 const char* real_name;
867 bool warn_if_deprecated = true;
868
869 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
870 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
871 if (alf.alias_name != NULL){
872 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
873 return true;
874 }
875 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
876 if (real_name == NULL) {
877 return false;
878 }
879 return set_bool_flag(real_name, false, origin);
880 }
881 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
882 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
883 if (alf.alias_name != NULL){
884 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
885 return true;
886 }
887 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
888 if (real_name == NULL) {
889 return false;
890 }
891 return set_bool_flag(real_name, true, origin);
892 }
893
894 char punct;
895 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
896 const char* value = strchr(arg, '=') + 1;
897 Flag* flag;
898
899 // this scanf pattern matches both strings (handled here) and numbers (handled later))
900 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
901 if (alf.alias_name != NULL) {
902 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
903 return true;
904 }
905 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
906 if (real_name == NULL) {
907 return false;
908 }
909 flag = Flag::find_flag(real_name);
910 if (flag != NULL && flag->is_ccstr()) {
911 if (flag->ccstr_accumulates()) {
912 return append_to_string_flag(real_name, value, origin);
913 } else {
914 if (value[0] == '\0') {
915 value = NULL;
916 }
917 return set_string_flag(real_name, value, origin);
918 }
919 } else {
920 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
921 }
922 }
923
924 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
925 const char* value = strchr(arg, '=') + 1;
926 // -XX:Foo:=xxx will reset the string flag to the given value.
927 if (value[0] == '\0') {
928 value = NULL;
929 }
930 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
931 if (real_name == NULL) {
932 return false;
933 }
934 return set_string_flag(real_name, value, origin);
935 }
936
937 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
938 #define SIGNED_NUMBER_RANGE "[-0123456789]"
939 #define NUMBER_RANGE "[0123456789eE+-]"
940 char value[BUFLEN + 1];
941 char value2[BUFLEN + 1];
942 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
943 // Looks like a floating-point number -- try again with more lenient format string
944 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
945 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
946 if (real_name == NULL) {
947 return false;
948 }
949 return set_fp_numeric_flag(real_name, value, origin);
950 }
951 }
952
953 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
954 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
955 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
956 if (real_name == NULL) {
957 return false;
958 }
959 return set_numeric_flag(real_name, value, origin);
960 }
961
962 return false;
963 }
964
965 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
966 assert(bldarray != NULL, "illegal argument");
967
968 if (arg == NULL) {
969 return;
970 }
971
972 int new_count = *count + 1;
973
974 // expand the array and add arg to the last element
975 if (*bldarray == NULL) {
976 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
977 } else {
978 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
979 }
980 (*bldarray)[*count] = os::strdup_check_oom(arg);
981 *count = new_count;
982 }
983
984 void Arguments::build_jvm_args(const char* arg) {
985 add_string(&_jvm_args_array, &_num_jvm_args, arg);
986 }
987
988 void Arguments::build_jvm_flags(const char* arg) {
989 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
990 }
991
992 // utility function to return a string that concatenates all
993 // strings in a given char** array
994 const char* Arguments::build_resource_string(char** args, int count) {
995 if (args == NULL || count == 0) {
996 return NULL;
997 }
998 size_t length = 0;
999 for (int i = 0; i < count; i++) {
1000 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1001 }
1002 char* s = NEW_RESOURCE_ARRAY(char, length);
1003 char* dst = s;
1004 for (int j = 0; j < count; j++) {
1005 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1006 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1007 dst += offset;
1008 length -= offset;
1009 }
1010 return (const char*) s;
1011 }
1012
1013 void Arguments::print_on(outputStream* st) {
1014 st->print_cr("VM Arguments:");
1015 if (num_jvm_flags() > 0) {
1016 st->print("jvm_flags: "); print_jvm_flags_on(st);
1017 st->cr();
1018 }
1019 if (num_jvm_args() > 0) {
1020 st->print("jvm_args: "); print_jvm_args_on(st);
1021 st->cr();
1022 }
1023 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1024 if (_java_class_path != NULL) {
1025 char* path = _java_class_path->value();
1026 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1027 }
1028 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1029 }
1030
1031 void Arguments::print_summary_on(outputStream* st) {
1032 // Print the command line. Environment variables that are helpful for
1033 // reproducing the problem are written later in the hs_err file.
1034 // flags are from setting file
1035 if (num_jvm_flags() > 0) {
1036 st->print_raw("Settings File: ");
1037 print_jvm_flags_on(st);
1038 st->cr();
1039 }
1040 // args are the command line and environment variable arguments.
1041 st->print_raw("Command Line: ");
1042 if (num_jvm_args() > 0) {
1043 print_jvm_args_on(st);
1044 }
1045 // this is the classfile and any arguments to the java program
1046 if (java_command() != NULL) {
1047 st->print("%s", java_command());
1048 }
1049 st->cr();
1050 }
1051
1052 void Arguments::print_jvm_flags_on(outputStream* st) {
1053 if (_num_jvm_flags > 0) {
1054 for (int i=0; i < _num_jvm_flags; i++) {
1055 st->print("%s ", _jvm_flags_array[i]);
1056 }
1057 }
1058 }
1059
1060 void Arguments::print_jvm_args_on(outputStream* st) {
1061 if (_num_jvm_args > 0) {
1062 for (int i=0; i < _num_jvm_args; i++) {
1063 st->print("%s ", _jvm_args_array[i]);
1064 }
1065 }
1066 }
1067
1068 bool Arguments::process_argument(const char* arg,
1069 jboolean ignore_unrecognized,
1070 Flag::Flags origin) {
1071 JDK_Version since = JDK_Version();
1072
1073 if (parse_argument(arg, origin)) {
1074 return true;
1075 }
1076
1077 // Determine if the flag has '+', '-', or '=' characters.
1078 bool has_plus_minus = (*arg == '+' || *arg == '-');
1079 const char* const argname = has_plus_minus ? arg + 1 : arg;
1080
1081 size_t arg_len;
1082 const char* equal_sign = strchr(argname, '=');
1083 if (equal_sign == NULL) {
1084 arg_len = strlen(argname);
1085 } else {
1086 arg_len = equal_sign - argname;
1087 }
1088
1089 // Only make the obsolete check for valid arguments.
1090 if (arg_len <= BUFLEN) {
1091 // Construct a string which consists only of the argument name without '+', '-', or '='.
1092 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1093 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1094 if (is_obsolete_flag(stripped_argname, &since)) {
1095 char version[256];
1096 since.to_string(version, sizeof(version));
1097 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1098 return true;
1099 }
1100 #ifndef PRODUCT
1101 else {
1102 const char* replacement;
1103 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1104 log_warning(arguments)("%s has been removed. Please use %s instead.",
1105 stripped_argname,
1106 replacement);
1107 return false;
1108 }
1109 }
1110 #endif //PRODUCT
1111 }
1112
1113 // For locked flags, report a custom error message if available.
1114 // Otherwise, report the standard unrecognized VM option.
1115 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1116 if (found_flag != NULL) {
1117 char locked_message_buf[BUFLEN];
1118 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1119 if (strlen(locked_message_buf) == 0) {
1120 if (found_flag->is_bool() && !has_plus_minus) {
1121 jio_fprintf(defaultStream::error_stream(),
1122 "Missing +/- setting for VM option '%s'\n", argname);
1123 } else if (!found_flag->is_bool() && has_plus_minus) {
1124 jio_fprintf(defaultStream::error_stream(),
1125 "Unexpected +/- setting in VM option '%s'\n", argname);
1126 } else {
1127 jio_fprintf(defaultStream::error_stream(),
1128 "Improperly specified VM option '%s'\n", argname);
1129 }
1130 } else {
1131 #ifdef PRODUCT
1132 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1133 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1134 if (ignore_unrecognized && mismatched) {
1135 return true;
1136 }
1137 #endif
1138 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1139 }
1140 } else {
1141 if (ignore_unrecognized) {
1142 return true;
1143 }
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Unrecognized VM option '%s'\n", argname);
1146 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1147 if (fuzzy_matched != NULL) {
1148 jio_fprintf(defaultStream::error_stream(),
1149 "Did you mean '%s%s%s'? ",
1150 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1151 fuzzy_matched->_name,
1152 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1153 }
1154 }
1155
1156 // allow for commandline "commenting out" options like -XX:#+Verbose
1157 return arg[0] == '#';
1158 }
1159
1160 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1161 FILE* stream = fopen(file_name, "rb");
1162 if (stream == NULL) {
1163 if (should_exist) {
1164 jio_fprintf(defaultStream::error_stream(),
1165 "Could not open settings file %s\n", file_name);
1166 return false;
1167 } else {
1168 return true;
1169 }
1170 }
1171
1172 char token[1024];
1173 int pos = 0;
1174
1175 bool in_white_space = true;
1176 bool in_comment = false;
1177 bool in_quote = false;
1178 char quote_c = 0;
1179 bool result = true;
1180
1181 int c = getc(stream);
1182 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1183 if (in_white_space) {
1184 if (in_comment) {
1185 if (c == '\n') in_comment = false;
1186 } else {
1187 if (c == '#') in_comment = true;
1188 else if (!isspace(c)) {
1189 in_white_space = false;
1190 token[pos++] = c;
1191 }
1192 }
1193 } else {
1194 if (c == '\n' || (!in_quote && isspace(c))) {
1195 // token ends at newline, or at unquoted whitespace
1196 // this allows a way to include spaces in string-valued options
1197 token[pos] = '\0';
1198 logOption(token);
1199 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1200 build_jvm_flags(token);
1201 pos = 0;
1202 in_white_space = true;
1203 in_quote = false;
1204 } else if (!in_quote && (c == '\'' || c == '"')) {
1205 in_quote = true;
1206 quote_c = c;
1207 } else if (in_quote && (c == quote_c)) {
1208 in_quote = false;
1209 } else {
1210 token[pos++] = c;
1211 }
1212 }
1213 c = getc(stream);
1214 }
1215 if (pos > 0) {
1216 token[pos] = '\0';
1217 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1218 build_jvm_flags(token);
1219 }
1220 fclose(stream);
1221 return result;
1222 }
1223
1224 //=============================================================================================================
1225 // Parsing of properties (-D)
1226
1227 const char* Arguments::get_property(const char* key) {
1228 return PropertyList_get_value(system_properties(), key);
1229 }
1230
1231 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1232 const char* eq = strchr(prop, '=');
1233 const char* key;
1234 const char* value = "";
1235
1236 if (eq == NULL) {
1237 // property doesn't have a value, thus use passed string
1238 key = prop;
1239 } else {
1240 // property have a value, thus extract it and save to the
1241 // allocated string
1242 size_t key_len = eq - prop;
1243 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1244
1245 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1246 key = tmp_key;
1247
1248 value = &prop[key_len + 1];
1249 }
1250
1251 if (strcmp(key, "java.compiler") == 0) {
1252 process_java_compiler_argument(value);
1253 // Record value in Arguments, but let it get passed to Java.
1254 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1255 strcmp(key, "sun.java.launcher.pid") == 0) {
1256 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1257 // private and are processed in process_sun_java_launcher_properties();
1258 // the sun.java.launcher property is passed on to the java application
1259 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1260 // append is true, writable is true, internal is false
1261 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1262 WriteableProperty, ExternalProperty);
1263 } else {
1264 if (strcmp(key, "sun.java.command") == 0) {
1265 char *old_java_command = _java_command;
1266 _java_command = os::strdup_check_oom(value, mtArguments);
1267 if (old_java_command != NULL) {
1268 os::free(old_java_command);
1269 }
1270 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1271 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1272 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1273 // its value without going through the property list or making a Java call.
1274 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1275 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1276 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1277 os::free((void *)old_java_vendor_url_bug);
1278 }
1279 }
1280
1281 // Create new property and add at the end of the list
1282 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1283 }
1284
1285 if (key != prop) {
1286 // SystemProperty copy passed value, thus free previously allocated
1287 // memory
1288 FreeHeap((void *)key);
1289 }
1290
1291 return true;
1292 }
1293
1294 #if INCLUDE_CDS
1295 void Arguments::check_unsupported_dumping_properties() {
1296 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1297 const char* unsupported_properties[] = { "jdk.module.main",
1298 "jdk.module.limitmods",
1299 "jdk.module.path",
1300 "jdk.module.upgrade.path",
1301 "jdk.module.patch.0" };
1302 const char* unsupported_options[] = { "-m", // cannot use at dump time
1303 "--limit-modules", // ignored at dump time
1304 "--module-path", // ignored at dump time
1305 "--upgrade-module-path", // ignored at dump time
1306 "--patch-module" // ignored at dump time
1307 };
1308 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1309 // If a vm option is found in the unsupported_options array with index less than the info_idx,
1310 // vm will exit with an error message. Otherwise, it will print an informational message if
1311 // -Xlog:cds is enabled.
1312 uint info_idx = 1;
1313 SystemProperty* sp = system_properties();
1314 while (sp != NULL) {
1315 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1316 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1317 if (i < info_idx) {
1318 vm_exit_during_initialization(
1319 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1320 } else {
1321 log_info(cds)("Info: the %s option is ignored when dumping the shared archive",
1322 unsupported_options[i]);
1323 }
1324 }
1325 }
1326 sp = sp->next();
1327 }
1328
1329 // Check for an exploded module build in use with -Xshare:dump.
1330 if (!has_jimage()) {
1331 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1332 }
1333 }
1334 #endif
1335
1336 //===========================================================================================================
1337 // Setting int/mixed/comp mode flags
1338
1339 void Arguments::set_mode_flags(Mode mode) {
1340 // Set up default values for all flags.
1341 // If you add a flag to any of the branches below,
1342 // add a default value for it here.
1343 set_java_compiler(false);
1344 _mode = mode;
1345
1346 // Ensure Agent_OnLoad has the correct initial values.
1347 // This may not be the final mode; mode may change later in onload phase.
1348 PropertyList_unique_add(&_system_properties, "java.vm.info",
1349 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1350
1351 UseInterpreter = true;
1352 UseCompiler = true;
1353 UseLoopCounter = true;
1354
1355 // Default values may be platform/compiler dependent -
1356 // use the saved values
1357 ClipInlining = Arguments::_ClipInlining;
1358 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1359 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1360 BackgroundCompilation = Arguments::_BackgroundCompilation;
1361 if (TieredCompilation) {
1362 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1363 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1364 }
1365 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1366 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1367 }
1368 }
1369
1370 // Change from defaults based on mode
1371 switch (mode) {
1372 default:
1373 ShouldNotReachHere();
1374 break;
1375 case _int:
1376 UseCompiler = false;
1377 UseLoopCounter = false;
1378 AlwaysCompileLoopMethods = false;
1379 UseOnStackReplacement = false;
1380 break;
1381 case _mixed:
1382 // same as default
1383 break;
1384 case _comp:
1385 UseInterpreter = false;
1386 BackgroundCompilation = false;
1387 ClipInlining = false;
1388 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1389 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1390 // compile a level 4 (C2) and then continue executing it.
1391 if (TieredCompilation) {
1392 Tier3InvokeNotifyFreqLog = 0;
1393 Tier4InvocationThreshold = 0;
1394 }
1395 break;
1396 }
1397 }
1398
1399 // Conflict: required to use shared spaces (-Xshare:on), but
1400 // incompatible command line options were chosen.
1401 static void no_shared_spaces(const char* message) {
1402 if (RequireSharedSpaces) {
1403 jio_fprintf(defaultStream::error_stream(),
1404 "Class data sharing is inconsistent with other specified options.\n");
1405 vm_exit_during_initialization("Unable to use shared archive.", message);
1406 } else {
1407 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1408 }
1409 }
1410
1411 // Returns threshold scaled with the value of scale.
1412 // If scale < 0.0, threshold is returned without scaling.
1413 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1414 if (scale == 1.0 || scale < 0.0) {
1415 return threshold;
1416 } else {
1417 return (intx)(threshold * scale);
1418 }
1419 }
1420
1421 // Returns freq_log scaled with the value of scale.
1422 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1423 // If scale < 0.0, freq_log is returned without scaling.
1424 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1425 // Check if scaling is necessary or if negative value was specified.
1426 if (scale == 1.0 || scale < 0.0) {
1427 return freq_log;
1428 }
1429 // Check values to avoid calculating log2 of 0.
1430 if (scale == 0.0 || freq_log == 0) {
1431 return 0;
1432 }
1433 // Determine the maximum notification frequency value currently supported.
1434 // The largest mask value that the interpreter/C1 can handle is
1435 // of length InvocationCounter::number_of_count_bits. Mask values are always
1436 // one bit shorter then the value of the notification frequency. Set
1437 // max_freq_bits accordingly.
1438 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1439 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1440 if (scaled_freq == 0) {
1441 // Return 0 right away to avoid calculating log2 of 0.
1442 return 0;
1443 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1444 return max_freq_bits;
1445 } else {
1446 return log2_intptr(scaled_freq);
1447 }
1448 }
1449
1450 void Arguments::set_tiered_flags() {
1451 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1452 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1453 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1454 }
1455 if (CompilationPolicyChoice < 2) {
1456 vm_exit_during_initialization(
1457 "Incompatible compilation policy selected", NULL);
1458 }
1459 // Increase the code cache size - tiered compiles a lot more.
1460 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1461 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1462 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1463 }
1464 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1465 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1466 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1467 }
1468 if (!UseInterpreter) { // -Xcomp
1469 Tier3InvokeNotifyFreqLog = 0;
1470 Tier4InvocationThreshold = 0;
1471 }
1472
1473 if (CompileThresholdScaling < 0) {
1474 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1475 }
1476
1477 // Scale tiered compilation thresholds.
1478 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1479 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1480 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1481 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1482
1483 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1484 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1485 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1486 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1487
1488 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1489 // once these thresholds become supported.
1490
1491 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1492 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1493
1494 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1495 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1496
1497 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1498
1499 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1500 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1501 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1502 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1503 }
1504 }
1505
1506 void set_object_alignment() {
1507 // Object alignment.
1508 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1509 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1510 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1511 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1512 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1513 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1514
1515 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1516 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1517
1518 // Oop encoding heap max
1519 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1520
1521 if (SurvivorAlignmentInBytes == 0) {
1522 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1523 }
1524 }
1525
1526 size_t Arguments::max_heap_for_compressed_oops() {
1527 // Avoid sign flip.
1528 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1529 // We need to fit both the NULL page and the heap into the memory budget, while
1530 // keeping alignment constraints of the heap. To guarantee the latter, as the
1531 // NULL page is located before the heap, we pad the NULL page to the conservative
1532 // maximum alignment that the GC may ever impose upon the heap.
1533 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1534 _conservative_max_heap_alignment);
1535
1536 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1537 NOT_LP64(ShouldNotReachHere(); return 0);
1538 }
1539
1540 void Arguments::set_use_compressed_oops() {
1541 #ifndef ZERO
1542 #ifdef _LP64
1543 // MaxHeapSize is not set up properly at this point, but
1544 // the only value that can override MaxHeapSize if we are
1545 // to use UseCompressedOops is InitialHeapSize.
1546 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1547
1548 if (max_heap_size <= max_heap_for_compressed_oops()) {
1549 #if !defined(COMPILER1) || defined(TIERED)
1550 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1551 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1552 }
1553 #endif
1554 } else {
1555 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1556 warning("Max heap size too large for Compressed Oops");
1557 FLAG_SET_DEFAULT(UseCompressedOops, false);
1558 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1559 }
1560 }
1561 #endif // _LP64
1562 #endif // ZERO
1563 }
1564
1565
1566 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1567 // set_use_compressed_oops().
1568 void Arguments::set_use_compressed_klass_ptrs() {
1569 #ifndef ZERO
1570 #ifdef _LP64
1571 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1572 if (!UseCompressedOops) {
1573 if (UseCompressedClassPointers) {
1574 warning("UseCompressedClassPointers requires UseCompressedOops");
1575 }
1576 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1577 } else {
1578 // Turn on UseCompressedClassPointers too
1579 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1580 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1581 }
1582 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1583 if (UseCompressedClassPointers) {
1584 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1585 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1586 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1587 }
1588 }
1589 }
1590 #endif // _LP64
1591 #endif // !ZERO
1592 }
1593
1594 void Arguments::set_conservative_max_heap_alignment() {
1595 // The conservative maximum required alignment for the heap is the maximum of
1596 // the alignments imposed by several sources: any requirements from the heap
1597 // itself, the collector policy and the maximum page size we may run the VM
1598 // with.
1599 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment();
1600 _conservative_max_heap_alignment = MAX4(heap_alignment,
1601 (size_t)os::vm_allocation_granularity(),
1602 os::max_page_size(),
1603 CollectorPolicy::compute_heap_alignment());
1604 }
1605
1606 #ifdef TIERED
1607 bool Arguments::compilation_mode_selected() {
1608 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1609 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1610
1611 }
1612
1613 void Arguments::select_compilation_mode_ergonomically() {
1614 #if defined(_WINDOWS) && !defined(_LP64)
1615 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1616 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1617 }
1618 #endif
1619 if (NeverActAsServerClassMachine) {
1620 set_client_compilation_mode();
1621 }
1622 }
1623 #endif //TIERED
1624
1625 #if INCLUDE_JVMCI
1626 void Arguments::set_jvmci_specific_flags() {
1627 if (UseJVMCICompiler) {
1628 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1629 FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1630 }
1631 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1632 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1633 }
1634 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1635 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1636 }
1637 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1638 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1639 }
1640 if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1641 FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1642 }
1643 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1644 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1645 }
1646 if (TieredStopAtLevel != CompLevel_full_optimization) {
1647 // Currently JVMCI compiler can only work at the full optimization level
1648 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1649 TieredStopAtLevel = CompLevel_full_optimization;
1650 }
1651 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1652 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1653 }
1654 }
1655 }
1656 #endif
1657
1658 jint Arguments::set_ergonomics_flags() {
1659 #ifdef TIERED
1660 if (!compilation_mode_selected()) {
1661 select_compilation_mode_ergonomically();
1662 }
1663 #endif
1664
1665 jint gc_result = GCArguments::initialize();
1666 if (gc_result != JNI_OK) {
1667 return gc_result;
1668 }
1669
1670 #if COMPILER2_OR_JVMCI
1671 // Shared spaces work fine with other GCs but causes bytecode rewriting
1672 // to be disabled, which hurts interpreter performance and decreases
1673 // server performance. When -server is specified, keep the default off
1674 // unless it is asked for. Future work: either add bytecode rewriting
1675 // at link time, or rewrite bytecodes in non-shared methods.
1676 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1677 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1678 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1679 }
1680 #endif
1681
1682 set_conservative_max_heap_alignment();
1683
1684 #ifndef ZERO
1685 #ifdef _LP64
1686 set_use_compressed_oops();
1687
1688 // set_use_compressed_klass_ptrs() must be called after calling
1689 // set_use_compressed_oops().
1690 set_use_compressed_klass_ptrs();
1691
1692 // Also checks that certain machines are slower with compressed oops
1693 // in vm_version initialization code.
1694 #endif // _LP64
1695 #endif // !ZERO
1696
1697 return JNI_OK;
1698 }
1699
1700 void Arguments::set_gc_specific_flags() {
1701 // Set GC flags
1702 GCArguments::arguments()->initialize_flags();
1703 }
1704
1705 julong Arguments::limit_by_allocatable_memory(julong limit) {
1706 julong max_allocatable;
1707 julong result = limit;
1708 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1709 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1710 }
1711 return result;
1712 }
1713
1714 // Use static initialization to get the default before parsing
1715 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1716
1717 void Arguments::set_heap_size() {
1718 julong phys_mem =
1719 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1720 : (julong)MaxRAM;
1721
1722 // Experimental support for CGroup memory limits
1723 if (UseCGroupMemoryLimitForHeap) {
1724 // This is a rough indicator that a CGroup limit may be in force
1725 // for this process
1726 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1727 FILE *fp = fopen(lim_file, "r");
1728 if (fp != NULL) {
1729 julong cgroup_max = 0;
1730 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1731 if (ret == 1 && cgroup_max > 0) {
1732 // If unlimited, cgroup_max will be a very large, but unspecified
1733 // value, so use initial phys_mem as a limit
1734 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
1735 JULONG_FORMAT "MB) and initial phys_mem ("
1736 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1737 phys_mem = MIN2(cgroup_max, phys_mem);
1738 } else {
1739 warning("Unable to read/parse cgroup memory limit from %s: %s",
1740 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1741 }
1742 fclose(fp);
1743 } else {
1744 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1745 }
1746 }
1747
1748 // Convert deprecated flags
1749 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1750 !FLAG_IS_DEFAULT(MaxRAMFraction))
1751 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1752
1753 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1754 !FLAG_IS_DEFAULT(MinRAMFraction))
1755 MinRAMPercentage = 100.0 / MinRAMFraction;
1756
1757 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1758 !FLAG_IS_DEFAULT(InitialRAMFraction))
1759 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1760
1761 // If the maximum heap size has not been set with -Xmx,
1762 // then set it as fraction of the size of physical memory,
1763 // respecting the maximum and minimum sizes of the heap.
1764 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1765 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1766 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1767 if (reasonable_min < MaxHeapSize) {
1768 // Small physical memory, so use a minimum fraction of it for the heap
1769 reasonable_max = reasonable_min;
1770 } else {
1771 // Not-small physical memory, so require a heap at least
1772 // as large as MaxHeapSize
1773 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1774 }
1775
1776 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1777 // Limit the heap size to ErgoHeapSizeLimit
1778 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1779 }
1780 if (UseCompressedOops) {
1781 // Limit the heap size to the maximum possible when using compressed oops
1782 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1783
1784 // HeapBaseMinAddress can be greater than default but not less than.
1785 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1786 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1787 // matches compressed oops printing flags
1788 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1789 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1790 DefaultHeapBaseMinAddress,
1791 DefaultHeapBaseMinAddress/G,
1792 HeapBaseMinAddress);
1793 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1794 }
1795 }
1796
1797 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1798 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1799 // but it should be not less than default MaxHeapSize.
1800 max_coop_heap -= HeapBaseMinAddress;
1801 }
1802 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1803 }
1804 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1805
1806 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1807 // An initial heap size was specified on the command line,
1808 // so be sure that the maximum size is consistent. Done
1809 // after call to limit_by_allocatable_memory because that
1810 // method might reduce the allocation size.
1811 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1812 }
1813
1814 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1815 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1816 }
1817
1818 // If the minimum or initial heap_size have not been set or requested to be set
1819 // ergonomically, set them accordingly.
1820 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1821 julong reasonable_minimum = (julong)(OldSize + NewSize);
1822
1823 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1824
1825 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1826
1827 if (InitialHeapSize == 0) {
1828 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1829
1830 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1831 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1832
1833 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1834
1835 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1836 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1837 }
1838 // If the minimum heap size has not been set (via -Xms),
1839 // synchronize with InitialHeapSize to avoid errors with the default value.
1840 if (min_heap_size() == 0) {
1841 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1842 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1843 }
1844 }
1845 }
1846
1847 // This option inspects the machine and attempts to set various
1848 // parameters to be optimal for long-running, memory allocation
1849 // intensive jobs. It is intended for machines with large
1850 // amounts of cpu and memory.
1851 jint Arguments::set_aggressive_heap_flags() {
1852 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1853 // VM, but we may not be able to represent the total physical memory
1854 // available (like having 8gb of memory on a box but using a 32bit VM).
1855 // Thus, we need to make sure we're using a julong for intermediate
1856 // calculations.
1857 julong initHeapSize;
1858 julong total_memory = os::physical_memory();
1859
1860 if (total_memory < (julong) 256 * M) {
1861 jio_fprintf(defaultStream::error_stream(),
1862 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1863 vm_exit(1);
1864 }
1865
1866 // The heap size is half of available memory, or (at most)
1867 // all of possible memory less 160mb (leaving room for the OS
1868 // when using ISM). This is the maximum; because adaptive sizing
1869 // is turned on below, the actual space used may be smaller.
1870
1871 initHeapSize = MIN2(total_memory / (julong) 2,
1872 total_memory - (julong) 160 * M);
1873
1874 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1875
1876 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1877 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
1878 return JNI_EINVAL;
1879 }
1880 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
1881 return JNI_EINVAL;
1882 }
1883 // Currently the minimum size and the initial heap sizes are the same.
1884 set_min_heap_size(initHeapSize);
1885 }
1886 if (FLAG_IS_DEFAULT(NewSize)) {
1887 // Make the young generation 3/8ths of the total heap.
1888 if (FLAG_SET_CMDLINE(size_t, NewSize,
1889 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
1890 return JNI_EINVAL;
1891 }
1892 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
1893 return JNI_EINVAL;
1894 }
1895 }
1896
1897 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1898 FLAG_SET_DEFAULT(UseLargePages, true);
1899 #endif
1900
1901 // Increase some data structure sizes for efficiency
1902 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
1903 return JNI_EINVAL;
1904 }
1905 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
1906 return JNI_EINVAL;
1907 }
1908 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
1909 return JNI_EINVAL;
1910 }
1911
1912 // See the OldPLABSize comment below, but replace 'after promotion'
1913 // with 'after copying'. YoungPLABSize is the size of the survivor
1914 // space per-gc-thread buffers. The default is 4kw.
1915 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
1916 return JNI_EINVAL;
1917 }
1918
1919 // OldPLABSize is the size of the buffers in the old gen that
1920 // UseParallelGC uses to promote live data that doesn't fit in the
1921 // survivor spaces. At any given time, there's one for each gc thread.
1922 // The default size is 1kw. These buffers are rarely used, since the
1923 // survivor spaces are usually big enough. For specjbb, however, there
1924 // are occasions when there's lots of live data in the young gen
1925 // and we end up promoting some of it. We don't have a definite
1926 // explanation for why bumping OldPLABSize helps, but the theory
1927 // is that a bigger PLAB results in retaining something like the
1928 // original allocation order after promotion, which improves mutator
1929 // locality. A minor effect may be that larger PLABs reduce the
1930 // number of PLAB allocation events during gc. The value of 8kw
1931 // was arrived at by experimenting with specjbb.
1932 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
1933 return JNI_EINVAL;
1934 }
1935
1936 // Enable parallel GC and adaptive generation sizing
1937 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
1938 return JNI_EINVAL;
1939 }
1940
1941 // Encourage steady state memory management
1942 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
1943 return JNI_EINVAL;
1944 }
1945
1946 // This appears to improve mutator locality
1947 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
1948 return JNI_EINVAL;
1949 }
1950
1951 // Get around early Solaris scheduling bug
1952 // (affinity vs other jobs on system)
1953 // but disallow DR and offlining (5008695).
1954 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
1955 return JNI_EINVAL;
1956 }
1957
1958 return JNI_OK;
1959 }
1960
1961 // This must be called after ergonomics.
1962 void Arguments::set_bytecode_flags() {
1963 if (!RewriteBytecodes) {
1964 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1965 }
1966 }
1967
1968 // Aggressive optimization flags -XX:+AggressiveOpts
1969 jint Arguments::set_aggressive_opts_flags() {
1970 #ifdef COMPILER2
1971 if (AggressiveUnboxing) {
1972 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1973 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1974 } else if (!EliminateAutoBox) {
1975 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1976 AggressiveUnboxing = false;
1977 }
1978 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1979 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1980 } else if (!DoEscapeAnalysis) {
1981 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1982 AggressiveUnboxing = false;
1983 }
1984 }
1985 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1986 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1987 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1988 }
1989 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1990 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1991 }
1992
1993 // Feed the cache size setting into the JDK
1994 char buffer[1024];
1995 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1996 if (!add_property(buffer)) {
1997 return JNI_ENOMEM;
1998 }
1999 }
2000 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2001 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2002 }
2003 #endif
2004
2005 if (AggressiveOpts) {
2006 // Sample flag setting code
2007 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2008 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2009 // }
2010 }
2011
2012 return JNI_OK;
2013 }
2014
2015 //===========================================================================================================
2016 // Parsing of java.compiler property
2017
2018 void Arguments::process_java_compiler_argument(const char* arg) {
2019 // For backwards compatibility, Djava.compiler=NONE or ""
2020 // causes us to switch to -Xint mode UNLESS -Xdebug
2021 // is also specified.
2022 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2023 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2024 }
2025 }
2026
2027 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2028 _sun_java_launcher = os::strdup_check_oom(launcher);
2029 }
2030
2031 bool Arguments::created_by_java_launcher() {
2032 assert(_sun_java_launcher != NULL, "property must have value");
2033 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2034 }
2035
2036 bool Arguments::sun_java_launcher_is_altjvm() {
2037 return _sun_java_launcher_is_altjvm;
2038 }
2039
2040 //===========================================================================================================
2041 // Parsing of main arguments
2042
2043 #if INCLUDE_JVMCI
2044 // Check consistency of jvmci vm argument settings.
2045 bool Arguments::check_jvmci_args_consistency() {
2046 return JVMCIGlobals::check_jvmci_flags_are_consistent();
2047 }
2048 #endif //INCLUDE_JVMCI
2049
2050 // Check consistency of GC selection
2051 bool Arguments::check_gc_consistency() {
2052 // Ensure that the user has not selected conflicting sets
2053 // of collectors.
2054 uint i = 0;
2055 if (UseSerialGC) i++;
2056 if (UseConcMarkSweepGC) i++;
2057 if (UseParallelGC || UseParallelOldGC) i++;
2058 if (UseG1GC) i++;
2059 if (i > 1) {
2060 jio_fprintf(defaultStream::error_stream(),
2061 "Conflicting collector combinations in option list; "
2062 "please refer to the release notes for the combinations "
2063 "allowed\n");
2064 return false;
2065 }
2066
2067 return true;
2068 }
2069
2070 // Check the consistency of vm_init_args
2071 bool Arguments::check_vm_args_consistency() {
2072 // Method for adding checks for flag consistency.
2073 // The intent is to warn the user of all possible conflicts,
2074 // before returning an error.
2075 // Note: Needs platform-dependent factoring.
2076 bool status = true;
2077
2078 if (TLABRefillWasteFraction == 0) {
2079 jio_fprintf(defaultStream::error_stream(),
2080 "TLABRefillWasteFraction should be a denominator, "
2081 "not " SIZE_FORMAT "\n",
2082 TLABRefillWasteFraction);
2083 status = false;
2084 }
2085
2086 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2087 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2088 }
2089
2090 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2091 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2092 }
2093
2094 if (GCTimeLimit == 100) {
2095 // Turn off gc-overhead-limit-exceeded checks
2096 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2097 }
2098
2099 status = status && check_gc_consistency();
2100
2101 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2102 // insists that we hold the requisite locks so that the iteration is
2103 // MT-safe. For the verification at start-up and shut-down, we don't
2104 // yet have a good way of acquiring and releasing these locks,
2105 // which are not visible at the CollectedHeap level. We want to
2106 // be able to acquire these locks and then do the iteration rather
2107 // than just disable the lock verification. This will be fixed under
2108 // bug 4788986.
2109 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2110 if (VerifyDuringStartup) {
2111 warning("Heap verification at start-up disabled "
2112 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2113 VerifyDuringStartup = false; // Disable verification at start-up
2114 }
2115
2116 if (VerifyBeforeExit) {
2117 warning("Heap verification at shutdown disabled "
2118 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2119 VerifyBeforeExit = false; // Disable verification at shutdown
2120 }
2121 }
2122
2123 if (PrintNMTStatistics) {
2124 #if INCLUDE_NMT
2125 if (MemTracker::tracking_level() == NMT_off) {
2126 #endif // INCLUDE_NMT
2127 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2128 PrintNMTStatistics = false;
2129 #if INCLUDE_NMT
2130 }
2131 #endif
2132 }
2133
2134 #if INCLUDE_JVMCI
2135 status = status && check_jvmci_args_consistency();
2136
2137 if (EnableJVMCI) {
2138 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2139 AddProperty, UnwriteableProperty, InternalProperty);
2140
2141 if (!ScavengeRootsInCode) {
2142 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2143 ScavengeRootsInCode = 1;
2144 }
2145 }
2146 #endif
2147
2148 // Check lower bounds of the code cache
2149 // Template Interpreter code is approximately 3X larger in debug builds.
2150 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2151 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2152 jio_fprintf(defaultStream::error_stream(),
2153 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2154 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2155 status = false;
2156 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2157 jio_fprintf(defaultStream::error_stream(),
2158 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2159 min_code_cache_size/K);
2160 status = false;
2161 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2162 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2163 jio_fprintf(defaultStream::error_stream(),
2164 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2165 CODE_CACHE_SIZE_LIMIT/M);
2166 status = false;
2167 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2168 jio_fprintf(defaultStream::error_stream(),
2169 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2170 min_code_cache_size/K);
2171 status = false;
2172 }
2173
2174 #ifdef _LP64
2175 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2176 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2177 }
2178 #endif
2179
2180 #ifndef SUPPORT_RESERVED_STACK_AREA
2181 if (StackReservedPages != 0) {
2182 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2183 warning("Reserved Stack Area not supported on this platform");
2184 }
2185 #endif
2186
2187 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2188 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2189 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2190 }
2191 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2192 }
2193 if (UseCompiler && is_interpreter_only()) {
2194 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2195 warning("UseCompiler disabled due to -Xint.");
2196 }
2197 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2198 }
2199 #ifdef COMPILER2
2200 if (PostLoopMultiversioning && !RangeCheckElimination) {
2201 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2202 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2203 }
2204 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2205 }
2206 #endif
2207 return status;
2208 }
2209
2210 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2211 const char* option_type) {
2212 if (ignore) return false;
2213
2214 const char* spacer = " ";
2215 if (option_type == NULL) {
2216 option_type = ++spacer; // Set both to the empty string.
2217 }
2218
2219 if (os::obsolete_option(option)) {
2220 jio_fprintf(defaultStream::error_stream(),
2221 "Obsolete %s%soption: %s\n", option_type, spacer,
2222 option->optionString);
2223 return false;
2224 } else {
2225 jio_fprintf(defaultStream::error_stream(),
2226 "Unrecognized %s%soption: %s\n", option_type, spacer,
2227 option->optionString);
2228 return true;
2229 }
2230 }
2231
2232 static const char* user_assertion_options[] = {
2233 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2234 };
2235
2236 static const char* system_assertion_options[] = {
2237 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2238 };
2239
2240 bool Arguments::parse_uintx(const char* value,
2241 uintx* uintx_arg,
2242 uintx min_size) {
2243
2244 // Check the sign first since atojulong() parses only unsigned values.
2245 bool value_is_positive = !(*value == '-');
2246
2247 if (value_is_positive) {
2248 julong n;
2249 bool good_return = atojulong(value, &n);
2250 if (good_return) {
2251 bool above_minimum = n >= min_size;
2252 bool value_is_too_large = n > max_uintx;
2253
2254 if (above_minimum && !value_is_too_large) {
2255 *uintx_arg = n;
2256 return true;
2257 }
2258 }
2259 }
2260 return false;
2261 }
2262
2263 unsigned int addreads_count = 0;
2264 unsigned int addexports_count = 0;
2265 unsigned int addopens_count = 0;
2266 unsigned int addmods_count = 0;
2267 unsigned int patch_mod_count = 0;
2268
2269 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2270 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2271 char* property = AllocateHeap(prop_len, mtArguments);
2272 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2273 if (ret < 0 || ret >= (int)prop_len) {
2274 FreeHeap(property);
2275 return false;
2276 }
2277 bool added = add_property(property, UnwriteableProperty, internal);
2278 FreeHeap(property);
2279 return added;
2280 }
2281
2282 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2283 const unsigned int props_count_limit = 1000;
2284 const int max_digits = 3;
2285 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2286
2287 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2288 if (count < props_count_limit) {
2289 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2290 char* property = AllocateHeap(prop_len, mtArguments);
2291 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2292 if (ret < 0 || ret >= (int)prop_len) {
2293 FreeHeap(property);
2294 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2295 return false;
2296 }
2297 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2298 FreeHeap(property);
2299 return added;
2300 }
2301
2302 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2303 return false;
2304 }
2305
2306 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2307 julong* long_arg,
2308 julong min_size,
2309 julong max_size) {
2310 if (!atojulong(s, long_arg)) return arg_unreadable;
2311 return check_memory_size(*long_arg, min_size, max_size);
2312 }
2313
2314 // Parse JavaVMInitArgs structure
2315
2316 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2317 const JavaVMInitArgs *java_options_args,
2318 const JavaVMInitArgs *cmd_line_args) {
2319 bool patch_mod_javabase = false;
2320
2321 // Save default settings for some mode flags
2322 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2323 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2324 Arguments::_ClipInlining = ClipInlining;
2325 Arguments::_BackgroundCompilation = BackgroundCompilation;
2326 if (TieredCompilation) {
2327 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2328 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2329 }
2330
2331 // Setup flags for mixed which is the default
2332 set_mode_flags(_mixed);
2333
2334 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2335 // variable (if present).
2336 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2337 if (result != JNI_OK) {
2338 return result;
2339 }
2340
2341 // Parse args structure generated from the command line flags.
2342 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2343 if (result != JNI_OK) {
2344 return result;
2345 }
2346
2347 // Parse args structure generated from the _JAVA_OPTIONS environment
2348 // variable (if present) (mimics classic VM)
2349 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2350 if (result != JNI_OK) {
2351 return result;
2352 }
2353
2354 // We need to ensure processor and memory resources have been properly
2355 // configured - which may rely on arguments we just processed - before
2356 // doing the final argument processing. Any argument processing that
2357 // needs to know about processor and memory resources must occur after
2358 // this point.
2359
2360 os::init_container_support();
2361
2362 // Do final processing now that all arguments have been parsed
2363 result = finalize_vm_init_args(patch_mod_javabase);
2364 if (result != JNI_OK) {
2365 return result;
2366 }
2367
2368 return JNI_OK;
2369 }
2370
2371 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2372 // represents a valid JDWP agent. is_path==true denotes that we
2373 // are dealing with -agentpath (case where name is a path), otherwise with
2374 // -agentlib
2375 bool valid_jdwp_agent(char *name, bool is_path) {
2376 char *_name;
2377 const char *_jdwp = "jdwp";
2378 size_t _len_jdwp, _len_prefix;
2379
2380 if (is_path) {
2381 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2382 return false;
2383 }
2384
2385 _name++; // skip past last path separator
2386 _len_prefix = strlen(JNI_LIB_PREFIX);
2387
2388 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2389 return false;
2390 }
2391
2392 _name += _len_prefix;
2393 _len_jdwp = strlen(_jdwp);
2394
2395 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2396 _name += _len_jdwp;
2397 }
2398 else {
2399 return false;
2400 }
2401
2402 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2403 return false;
2404 }
2405
2406 return true;
2407 }
2408
2409 if (strcmp(name, _jdwp) == 0) {
2410 return true;
2411 }
2412
2413 return false;
2414 }
2415
2416 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2417 // --patch-module=<module>=<file>(<pathsep><file>)*
2418 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2419 // Find the equal sign between the module name and the path specification
2420 const char* module_equal = strchr(patch_mod_tail, '=');
2421 if (module_equal == NULL) {
2422 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2423 return JNI_ERR;
2424 } else {
2425 // Pick out the module name
2426 size_t module_len = module_equal - patch_mod_tail;
2427 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2428 if (module_name != NULL) {
2429 memcpy(module_name, patch_mod_tail, module_len);
2430 *(module_name + module_len) = '\0';
2431 // The path piece begins one past the module_equal sign
2432 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2433 FREE_C_HEAP_ARRAY(char, module_name);
2434 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2435 return JNI_ENOMEM;
2436 }
2437 } else {
2438 return JNI_ENOMEM;
2439 }
2440 }
2441 return JNI_OK;
2442 }
2443
2444 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2445 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2446 // The min and max sizes match the values in globals.hpp, but scaled
2447 // with K. The values have been chosen so that alignment with page
2448 // size doesn't change the max value, which makes the conversions
2449 // back and forth between Xss value and ThreadStackSize value easier.
2450 // The values have also been chosen to fit inside a 32-bit signed type.
2451 const julong min_ThreadStackSize = 0;
2452 const julong max_ThreadStackSize = 1 * M;
2453
2454 const julong min_size = min_ThreadStackSize * K;
2455 const julong max_size = max_ThreadStackSize * K;
2456
2457 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2458
2459 julong size = 0;
2460 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2461 if (errcode != arg_in_range) {
2462 bool silent = (option == NULL); // Allow testing to silence error messages
2463 if (!silent) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Invalid thread stack size: %s\n", option->optionString);
2466 describe_range_error(errcode);
2467 }
2468 return JNI_EINVAL;
2469 }
2470
2471 // Internally track ThreadStackSize in units of 1024 bytes.
2472 const julong size_aligned = align_up(size, K);
2473 assert(size <= size_aligned,
2474 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2475 size, size_aligned);
2476
2477 const julong size_in_K = size_aligned / K;
2478 assert(size_in_K < (julong)max_intx,
2479 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2480 size_in_K);
2481
2482 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2483 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2484 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2485 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2486 max_expanded, size_in_K);
2487
2488 *out_ThreadStackSize = (intx)size_in_K;
2489
2490 return JNI_OK;
2491 }
2492
2493 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2494 // For match_option to return remaining or value part of option string
2495 const char* tail;
2496
2497 // iterate over arguments
2498 for (int index = 0; index < args->nOptions; index++) {
2499 bool is_absolute_path = false; // for -agentpath vs -agentlib
2500
2501 const JavaVMOption* option = args->options + index;
2502
2503 if (!match_option(option, "-Djava.class.path", &tail) &&
2504 !match_option(option, "-Dsun.java.command", &tail) &&
2505 !match_option(option, "-Dsun.java.launcher", &tail)) {
2506
2507 // add all jvm options to the jvm_args string. This string
2508 // is used later to set the java.vm.args PerfData string constant.
2509 // the -Djava.class.path and the -Dsun.java.command options are
2510 // omitted from jvm_args string as each have their own PerfData
2511 // string constant object.
2512 build_jvm_args(option->optionString);
2513 }
2514
2515 // -verbose:[class/module/gc/jni]
2516 if (match_option(option, "-verbose", &tail)) {
2517 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2518 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2519 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2520 } else if (!strcmp(tail, ":module")) {
2521 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2522 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2523 } else if (!strcmp(tail, ":gc")) {
2524 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2525 } else if (!strcmp(tail, ":jni")) {
2526 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2527 return JNI_EINVAL;
2528 }
2529 }
2530 // -da / -ea / -disableassertions / -enableassertions
2531 // These accept an optional class/package name separated by a colon, e.g.,
2532 // -da:java.lang.Thread.
2533 } else if (match_option(option, user_assertion_options, &tail, true)) {
2534 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2535 if (*tail == '\0') {
2536 JavaAssertions::setUserClassDefault(enable);
2537 } else {
2538 assert(*tail == ':', "bogus match by match_option()");
2539 JavaAssertions::addOption(tail + 1, enable);
2540 }
2541 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2542 } else if (match_option(option, system_assertion_options, &tail, false)) {
2543 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2544 JavaAssertions::setSystemClassDefault(enable);
2545 // -bootclasspath:
2546 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2547 jio_fprintf(defaultStream::output_stream(),
2548 "-Xbootclasspath is no longer a supported option.\n");
2549 return JNI_EINVAL;
2550 // -bootclasspath/a:
2551 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2552 Arguments::append_sysclasspath(tail);
2553 // -bootclasspath/p:
2554 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2555 jio_fprintf(defaultStream::output_stream(),
2556 "-Xbootclasspath/p is no longer a supported option.\n");
2557 return JNI_EINVAL;
2558 // -Xrun
2559 } else if (match_option(option, "-Xrun", &tail)) {
2560 if (tail != NULL) {
2561 const char* pos = strchr(tail, ':');
2562 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2563 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2564 jio_snprintf(name, len + 1, "%s", tail);
2565
2566 char *options = NULL;
2567 if(pos != NULL) {
2568 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2569 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2570 }
2571 #if !INCLUDE_JVMTI
2572 if (strcmp(name, "jdwp") == 0) {
2573 jio_fprintf(defaultStream::error_stream(),
2574 "Debugging agents are not supported in this VM\n");
2575 return JNI_ERR;
2576 }
2577 #endif // !INCLUDE_JVMTI
2578 add_init_library(name, options);
2579 }
2580 } else if (match_option(option, "--add-reads=", &tail)) {
2581 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2582 return JNI_ENOMEM;
2583 }
2584 } else if (match_option(option, "--add-exports=", &tail)) {
2585 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2586 return JNI_ENOMEM;
2587 }
2588 } else if (match_option(option, "--add-opens=", &tail)) {
2589 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2590 return JNI_ENOMEM;
2591 }
2592 } else if (match_option(option, "--add-modules=", &tail)) {
2593 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2594 return JNI_ENOMEM;
2595 }
2596 } else if (match_option(option, "--limit-modules=", &tail)) {
2597 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2598 return JNI_ENOMEM;
2599 }
2600 } else if (match_option(option, "--module-path=", &tail)) {
2601 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2602 return JNI_ENOMEM;
2603 }
2604 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2605 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2606 return JNI_ENOMEM;
2607 }
2608 } else if (match_option(option, "--patch-module=", &tail)) {
2609 // --patch-module=<module>=<file>(<pathsep><file>)*
2610 int res = process_patch_mod_option(tail, patch_mod_javabase);
2611 if (res != JNI_OK) {
2612 return res;
2613 }
2614 } else if (match_option(option, "--illegal-access=", &tail)) {
2615 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2616 return JNI_ENOMEM;
2617 }
2618 // -agentlib and -agentpath
2619 } else if (match_option(option, "-agentlib:", &tail) ||
2620 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2621 if(tail != NULL) {
2622 const char* pos = strchr(tail, '=');
2623 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2624 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2625 name[len] = '\0';
2626
2627 char *options = NULL;
2628 if(pos != NULL) {
2629 options = os::strdup_check_oom(pos + 1, mtArguments);
2630 }
2631 #if !INCLUDE_JVMTI
2632 if (valid_jdwp_agent(name, is_absolute_path)) {
2633 jio_fprintf(defaultStream::error_stream(),
2634 "Debugging agents are not supported in this VM\n");
2635 return JNI_ERR;
2636 }
2637 #endif // !INCLUDE_JVMTI
2638 add_init_agent(name, options, is_absolute_path);
2639 }
2640 // -javaagent
2641 } else if (match_option(option, "-javaagent:", &tail)) {
2642 #if !INCLUDE_JVMTI
2643 jio_fprintf(defaultStream::error_stream(),
2644 "Instrumentation agents are not supported in this VM\n");
2645 return JNI_ERR;
2646 #else
2647 if (tail != NULL) {
2648 size_t length = strlen(tail) + 1;
2649 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2650 jio_snprintf(options, length, "%s", tail);
2651 add_init_agent("instrument", options, false);
2652 // java agents need module java.instrument
2653 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2654 return JNI_ENOMEM;
2655 }
2656 }
2657 #endif // !INCLUDE_JVMTI
2658 // -Xnoclassgc
2659 } else if (match_option(option, "-Xnoclassgc")) {
2660 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2661 return JNI_EINVAL;
2662 }
2663 // -Xconcgc
2664 } else if (match_option(option, "-Xconcgc")) {
2665 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2666 return JNI_EINVAL;
2667 }
2668 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2669 // -Xnoconcgc
2670 } else if (match_option(option, "-Xnoconcgc")) {
2671 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2672 return JNI_EINVAL;
2673 }
2674 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2675 // -Xbatch
2676 } else if (match_option(option, "-Xbatch")) {
2677 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2678 return JNI_EINVAL;
2679 }
2680 // -Xmn for compatibility with other JVM vendors
2681 } else if (match_option(option, "-Xmn", &tail)) {
2682 julong long_initial_young_size = 0;
2683 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2684 if (errcode != arg_in_range) {
2685 jio_fprintf(defaultStream::error_stream(),
2686 "Invalid initial young generation size: %s\n", option->optionString);
2687 describe_range_error(errcode);
2688 return JNI_EINVAL;
2689 }
2690 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2691 return JNI_EINVAL;
2692 }
2693 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2694 return JNI_EINVAL;
2695 }
2696 // -Xms
2697 } else if (match_option(option, "-Xms", &tail)) {
2698 julong long_initial_heap_size = 0;
2699 // an initial heap size of 0 means automatically determine
2700 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2701 if (errcode != arg_in_range) {
2702 jio_fprintf(defaultStream::error_stream(),
2703 "Invalid initial heap size: %s\n", option->optionString);
2704 describe_range_error(errcode);
2705 return JNI_EINVAL;
2706 }
2707 set_min_heap_size((size_t)long_initial_heap_size);
2708 // Currently the minimum size and the initial heap sizes are the same.
2709 // Can be overridden with -XX:InitialHeapSize.
2710 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2711 return JNI_EINVAL;
2712 }
2713 // -Xmx
2714 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2715 julong long_max_heap_size = 0;
2716 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2717 if (errcode != arg_in_range) {
2718 jio_fprintf(defaultStream::error_stream(),
2719 "Invalid maximum heap size: %s\n", option->optionString);
2720 describe_range_error(errcode);
2721 return JNI_EINVAL;
2722 }
2723 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 // Xmaxf
2727 } else if (match_option(option, "-Xmaxf", &tail)) {
2728 char* err;
2729 int maxf = (int)(strtod(tail, &err) * 100);
2730 if (*err != '\0' || *tail == '\0') {
2731 jio_fprintf(defaultStream::error_stream(),
2732 "Bad max heap free percentage size: %s\n",
2733 option->optionString);
2734 return JNI_EINVAL;
2735 } else {
2736 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 }
2740 // Xminf
2741 } else if (match_option(option, "-Xminf", &tail)) {
2742 char* err;
2743 int minf = (int)(strtod(tail, &err) * 100);
2744 if (*err != '\0' || *tail == '\0') {
2745 jio_fprintf(defaultStream::error_stream(),
2746 "Bad min heap free percentage size: %s\n",
2747 option->optionString);
2748 return JNI_EINVAL;
2749 } else {
2750 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2751 return JNI_EINVAL;
2752 }
2753 }
2754 // -Xss
2755 } else if (match_option(option, "-Xss", &tail)) {
2756 intx value = 0;
2757 jint err = parse_xss(option, tail, &value);
2758 if (err != JNI_OK) {
2759 return err;
2760 }
2761 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) {
2762 return JNI_EINVAL;
2763 }
2764 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2765 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2766 julong long_ReservedCodeCacheSize = 0;
2767
2768 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2769 if (errcode != arg_in_range) {
2770 jio_fprintf(defaultStream::error_stream(),
2771 "Invalid maximum code cache size: %s.\n", option->optionString);
2772 return JNI_EINVAL;
2773 }
2774 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 // -green
2778 } else if (match_option(option, "-green")) {
2779 jio_fprintf(defaultStream::error_stream(),
2780 "Green threads support not available\n");
2781 return JNI_EINVAL;
2782 // -native
2783 } else if (match_option(option, "-native")) {
2784 // HotSpot always uses native threads, ignore silently for compatibility
2785 // -Xrs
2786 } else if (match_option(option, "-Xrs")) {
2787 // Classic/EVM option, new functionality
2788 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2789 return JNI_EINVAL;
2790 }
2791 // -Xprof
2792 } else if (match_option(option, "-Xprof")) {
2793 char version[256];
2794 // Obsolete in JDK 10
2795 JDK_Version::jdk(10).to_string(version, sizeof(version));
2796 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2797 // -Xconcurrentio
2798 } else if (match_option(option, "-Xconcurrentio")) {
2799 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2800 return JNI_EINVAL;
2801 }
2802 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2803 return JNI_EINVAL;
2804 }
2805 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2806 return JNI_EINVAL;
2807 }
2808 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2809 return JNI_EINVAL;
2810 }
2811 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2812 return JNI_EINVAL;
2813 }
2814
2815 // -Xinternalversion
2816 } else if (match_option(option, "-Xinternalversion")) {
2817 jio_fprintf(defaultStream::output_stream(), "%s\n",
2818 VM_Version::internal_vm_info_string());
2819 vm_exit(0);
2820 #ifndef PRODUCT
2821 // -Xprintflags
2822 } else if (match_option(option, "-Xprintflags")) {
2823 CommandLineFlags::printFlags(tty, false);
2824 vm_exit(0);
2825 #endif
2826 // -D
2827 } else if (match_option(option, "-D", &tail)) {
2828 const char* value;
2829 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2830 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2831 // abort if -Djava.endorsed.dirs is set
2832 jio_fprintf(defaultStream::output_stream(),
2833 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2834 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2835 return JNI_EINVAL;
2836 }
2837 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2838 *value != '\0' && strcmp(value, "\"\"") != 0) {
2839 // abort if -Djava.ext.dirs is set
2840 jio_fprintf(defaultStream::output_stream(),
2841 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2842 return JNI_EINVAL;
2843 }
2844 // Check for module related properties. They must be set using the modules
2845 // options. For example: use "--add-modules=java.sql", not
2846 // "-Djdk.module.addmods=java.sql"
2847 if (is_internal_module_property(option->optionString + 2)) {
2848 needs_module_property_warning = true;
2849 continue;
2850 }
2851
2852 if (!add_property(tail)) {
2853 return JNI_ENOMEM;
2854 }
2855 // Out of the box management support
2856 if (match_option(option, "-Dcom.sun.management", &tail)) {
2857 #if INCLUDE_MANAGEMENT
2858 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2859 return JNI_EINVAL;
2860 }
2861 // management agent in module jdk.management.agent
2862 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2863 return JNI_ENOMEM;
2864 }
2865 #else
2866 jio_fprintf(defaultStream::output_stream(),
2867 "-Dcom.sun.management is not supported in this VM.\n");
2868 return JNI_ERR;
2869 #endif
2870 }
2871 // -Xint
2872 } else if (match_option(option, "-Xint")) {
2873 set_mode_flags(_int);
2874 // -Xmixed
2875 } else if (match_option(option, "-Xmixed")) {
2876 set_mode_flags(_mixed);
2877 // -Xcomp
2878 } else if (match_option(option, "-Xcomp")) {
2879 // for testing the compiler; turn off all flags that inhibit compilation
2880 set_mode_flags(_comp);
2881 // -Xshare:dump
2882 } else if (match_option(option, "-Xshare:dump")) {
2883 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2884 return JNI_EINVAL;
2885 }
2886 set_mode_flags(_int); // Prevent compilation, which creates objects
2887 // -Xshare:on
2888 } else if (match_option(option, "-Xshare:on")) {
2889 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2890 return JNI_EINVAL;
2891 }
2892 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 // -Xshare:auto
2896 } else if (match_option(option, "-Xshare:auto")) {
2897 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2898 return JNI_EINVAL;
2899 }
2900 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2901 return JNI_EINVAL;
2902 }
2903 // -Xshare:off
2904 } else if (match_option(option, "-Xshare:off")) {
2905 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2906 return JNI_EINVAL;
2907 }
2908 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2909 return JNI_EINVAL;
2910 }
2911 // -Xverify
2912 } else if (match_option(option, "-Xverify", &tail)) {
2913 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2914 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 } else if (strcmp(tail, ":remote") == 0) {
2921 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2922 return JNI_EINVAL;
2923 }
2924 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 } else if (strcmp(tail, ":none") == 0) {
2928 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2935 return JNI_EINVAL;
2936 }
2937 // -Xdebug
2938 } else if (match_option(option, "-Xdebug")) {
2939 // note this flag has been used, then ignore
2940 set_xdebug_mode(true);
2941 // -Xnoagent
2942 } else if (match_option(option, "-Xnoagent")) {
2943 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2944 } else if (match_option(option, "-Xloggc:", &tail)) {
2945 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2946 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2947 _gc_log_filename = os::strdup_check_oom(tail);
2948 } else if (match_option(option, "-Xlog", &tail)) {
2949 bool ret = false;
2950 if (strcmp(tail, ":help") == 0) {
2951 LogConfiguration::print_command_line_help(defaultStream::output_stream());
2952 vm_exit(0);
2953 } else if (strcmp(tail, ":disable") == 0) {
2954 LogConfiguration::disable_logging();
2955 ret = true;
2956 } else if (*tail == '\0') {
2957 ret = LogConfiguration::parse_command_line_arguments();
2958 assert(ret, "-Xlog without arguments should never fail to parse");
2959 } else if (*tail == ':') {
2960 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2961 }
2962 if (ret == false) {
2963 jio_fprintf(defaultStream::error_stream(),
2964 "Invalid -Xlog option '-Xlog%s'\n",
2965 tail);
2966 return JNI_EINVAL;
2967 }
2968 // JNI hooks
2969 } else if (match_option(option, "-Xcheck", &tail)) {
2970 if (!strcmp(tail, ":jni")) {
2971 #if !INCLUDE_JNI_CHECK
2972 warning("JNI CHECKING is not supported in this VM");
2973 #else
2974 CheckJNICalls = true;
2975 #endif // INCLUDE_JNI_CHECK
2976 } else if (is_bad_option(option, args->ignoreUnrecognized,
2977 "check")) {
2978 return JNI_EINVAL;
2979 }
2980 } else if (match_option(option, "vfprintf")) {
2981 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2982 } else if (match_option(option, "exit")) {
2983 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2984 } else if (match_option(option, "abort")) {
2985 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2986 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2987 // and the last option wins.
2988 } else if (match_option(option, "-XX:+NeverTenure")) {
2989 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2993 return JNI_EINVAL;
2994 }
2995 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
2996 return JNI_EINVAL;
2997 }
2998 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2999 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3000 return JNI_EINVAL;
3001 }
3002 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3003 return JNI_EINVAL;
3004 }
3005 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3006 return JNI_EINVAL;
3007 }
3008 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3009 uintx max_tenuring_thresh = 0;
3010 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3011 jio_fprintf(defaultStream::error_stream(),
3012 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3013 return JNI_EINVAL;
3014 }
3015
3016 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3017 return JNI_EINVAL;
3018 }
3019
3020 if (MaxTenuringThreshold == 0) {
3021 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3022 return JNI_EINVAL;
3023 }
3024 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 } else {
3028 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3029 return JNI_EINVAL;
3030 }
3031 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3032 return JNI_EINVAL;
3033 }
3034 }
3035 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3036 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3037 return JNI_EINVAL;
3038 }
3039 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3040 return JNI_EINVAL;
3041 }
3042 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3043 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3044 return JNI_EINVAL;
3045 }
3046 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3050 #if defined(DTRACE_ENABLED)
3051 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3052 return JNI_EINVAL;
3053 }
3054 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3058 return JNI_EINVAL;
3059 }
3060 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3061 return JNI_EINVAL;
3062 }
3063 #else // defined(DTRACE_ENABLED)
3064 jio_fprintf(defaultStream::error_stream(),
3065 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3066 return JNI_EINVAL;
3067 #endif // defined(DTRACE_ENABLED)
3068 #ifdef ASSERT
3069 } else if (match_option(option, "-XX:+FullGCALot")) {
3070 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 // disable scavenge before parallel mark-compact
3074 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 #endif
3078 #if !INCLUDE_MANAGEMENT
3079 } else if (match_option(option, "-XX:+ManagementServer")) {
3080 jio_fprintf(defaultStream::error_stream(),
3081 "ManagementServer is not supported in this VM.\n");
3082 return JNI_ERR;
3083 #endif // INCLUDE_MANAGEMENT
3084 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3085 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3086 // already been handled
3087 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3088 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3089 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3090 return JNI_EINVAL;
3091 }
3092 }
3093 // Unknown option
3094 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3095 return JNI_ERR;
3096 }
3097 }
3098
3099 // PrintSharedArchiveAndExit will turn on
3100 // -Xshare:on
3101 // -Xlog:class+path=info
3102 if (PrintSharedArchiveAndExit) {
3103 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3104 return JNI_EINVAL;
3105 }
3106 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3107 return JNI_EINVAL;
3108 }
3109 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3110 }
3111
3112 // Change the default value for flags which have different default values
3113 // when working with older JDKs.
3114 #ifdef LINUX
3115 if (JDK_Version::current().compare_major(6) <= 0 &&
3116 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3117 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3118 }
3119 #endif // LINUX
3120 fix_appclasspath();
3121 return JNI_OK;
3122 }
3123
3124 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3125 // For java.base check for duplicate --patch-module options being specified on the command line.
3126 // This check is only required for java.base, all other duplicate module specifications
3127 // will be checked during module system initialization. The module system initialization
3128 // will throw an ExceptionInInitializerError if this situation occurs.
3129 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3130 if (*patch_mod_javabase) {
3131 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3132 } else {
3133 *patch_mod_javabase = true;
3134 }
3135 }
3136
3137 // Create GrowableArray lazily, only if --patch-module has been specified
3138 if (_patch_mod_prefix == NULL) {
3139 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3140 }
3141
3142 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3143 }
3144
3145 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3146 //
3147 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3148 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3149 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3150 // path is treated as the current directory.
3151 //
3152 // This causes problems with CDS, which requires that all directories specified in the classpath
3153 // must be empty. In most cases, applications do NOT want to load classes from the current
3154 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3155 // scripts compatible with CDS.
3156 void Arguments::fix_appclasspath() {
3157 if (IgnoreEmptyClassPaths) {
3158 const char separator = *os::path_separator();
3159 const char* src = _java_class_path->value();
3160
3161 // skip over all the leading empty paths
3162 while (*src == separator) {
3163 src ++;
3164 }
3165
3166 char* copy = os::strdup_check_oom(src, mtArguments);
3167
3168 // trim all trailing empty paths
3169 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3170 *tail = '\0';
3171 }
3172
3173 char from[3] = {separator, separator, '\0'};
3174 char to [2] = {separator, '\0'};
3175 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3176 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3177 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3178 }
3179
3180 _java_class_path->set_writeable_value(copy);
3181 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3182 }
3183 }
3184
3185 static bool has_jar_files(const char* directory) {
3186 DIR* dir = os::opendir(directory);
3187 if (dir == NULL) return false;
3188
3189 struct dirent *entry;
3190 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3191 bool hasJarFile = false;
3192 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3193 const char* name = entry->d_name;
3194 const char* ext = name + strlen(name) - 4;
3195 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3196 }
3197 FREE_C_HEAP_ARRAY(char, dbuf);
3198 os::closedir(dir);
3199 return hasJarFile ;
3200 }
3201
3202 static int check_non_empty_dirs(const char* path) {
3203 const char separator = *os::path_separator();
3204 const char* const end = path + strlen(path);
3205 int nonEmptyDirs = 0;
3206 while (path < end) {
3207 const char* tmp_end = strchr(path, separator);
3208 if (tmp_end == NULL) {
3209 if (has_jar_files(path)) {
3210 nonEmptyDirs++;
3211 jio_fprintf(defaultStream::output_stream(),
3212 "Non-empty directory: %s\n", path);
3213 }
3214 path = end;
3215 } else {
3216 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3217 memcpy(dirpath, path, tmp_end - path);
3218 dirpath[tmp_end - path] = '\0';
3219 if (has_jar_files(dirpath)) {
3220 nonEmptyDirs++;
3221 jio_fprintf(defaultStream::output_stream(),
3222 "Non-empty directory: %s\n", dirpath);
3223 }
3224 FREE_C_HEAP_ARRAY(char, dirpath);
3225 path = tmp_end + 1;
3226 }
3227 }
3228 return nonEmptyDirs;
3229 }
3230
3231 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3232 // check if the default lib/endorsed directory exists; if so, error
3233 char path[JVM_MAXPATHLEN];
3234 const char* fileSep = os::file_separator();
3235 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3236
3237 if (CheckEndorsedAndExtDirs) {
3238 int nonEmptyDirs = 0;
3239 // check endorsed directory
3240 nonEmptyDirs += check_non_empty_dirs(path);
3241 // check the extension directories
3242 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3243 if (nonEmptyDirs > 0) {
3244 return JNI_ERR;
3245 }
3246 }
3247
3248 DIR* dir = os::opendir(path);
3249 if (dir != NULL) {
3250 jio_fprintf(defaultStream::output_stream(),
3251 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3252 "in modular form will be supported via the concept of upgradeable modules.\n");
3253 os::closedir(dir);
3254 return JNI_ERR;
3255 }
3256
3257 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3258 dir = os::opendir(path);
3259 if (dir != NULL) {
3260 jio_fprintf(defaultStream::output_stream(),
3261 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3262 "Use -classpath instead.\n.");
3263 os::closedir(dir);
3264 return JNI_ERR;
3265 }
3266
3267 // This must be done after all arguments have been processed
3268 // and the container support has been initialized since AggressiveHeap
3269 // relies on the amount of total memory available.
3270 if (AggressiveHeap) {
3271 jint result = set_aggressive_heap_flags();
3272 if (result != JNI_OK) {
3273 return result;
3274 }
3275 }
3276
3277 // This must be done after all arguments have been processed.
3278 // java_compiler() true means set to "NONE" or empty.
3279 if (java_compiler() && !xdebug_mode()) {
3280 // For backwards compatibility, we switch to interpreted mode if
3281 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3282 // not specified.
3283 set_mode_flags(_int);
3284 }
3285
3286 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3287 // but like -Xint, leave compilation thresholds unaffected.
3288 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3289 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3290 set_mode_flags(_int);
3291 }
3292
3293 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3294 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3295 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3296 }
3297
3298 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3299 // Don't degrade server performance for footprint
3300 if (FLAG_IS_DEFAULT(UseLargePages) &&
3301 MaxHeapSize < LargePageHeapSizeThreshold) {
3302 // No need for large granularity pages w/small heaps.
3303 // Note that large pages are enabled/disabled for both the
3304 // Java heap and the code cache.
3305 FLAG_SET_DEFAULT(UseLargePages, false);
3306 }
3307
3308 #elif defined(COMPILER2)
3309 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3310 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3311 }
3312 #endif
3313
3314 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3315 UNSUPPORTED_OPTION(ProfileInterpreter);
3316 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3317 #endif
3318
3319 #ifndef TIERED
3320 // Tiered compilation is undefined.
3321 UNSUPPORTED_OPTION(TieredCompilation);
3322 #endif
3323
3324 #if INCLUDE_JVMCI
3325 if (EnableJVMCI &&
3326 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3327 return JNI_ENOMEM;
3328 }
3329 #endif
3330
3331 // If we are running in a headless jre, force java.awt.headless property
3332 // to be true unless the property has already been set.
3333 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3334 if (os::is_headless_jre()) {
3335 const char* headless = Arguments::get_property("java.awt.headless");
3336 if (headless == NULL) {
3337 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3338 if (headless_env == NULL) {
3339 if (!add_property("java.awt.headless=true")) {
3340 return JNI_ENOMEM;
3341 }
3342 } else {
3343 char buffer[256];
3344 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3345 if (!add_property(buffer)) {
3346 return JNI_ENOMEM;
3347 }
3348 }
3349 }
3350 }
3351
3352 if (!check_vm_args_consistency()) {
3353 return JNI_ERR;
3354 }
3355
3356 #if INCLUDE_JVMCI
3357 if (UseJVMCICompiler) {
3358 Compilation_mode = CompMode_server;
3359 }
3360 #endif
3361
3362 #if INCLUDE_CDS
3363 if (DumpSharedSpaces) {
3364 // Disable biased locking now as it interferes with the clean up of
3365 // the archived Klasses and Java string objects (at dump time only).
3366 UseBiasedLocking = false;
3367 }
3368 if (UseSharedSpaces && patch_mod_javabase) {
3369 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3370 }
3371 #endif
3372
3373 return JNI_OK;
3374 }
3375
3376 // Helper class for controlling the lifetime of JavaVMInitArgs
3377 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3378 // deleted on the destruction of the ScopedVMInitArgs object.
3379 class ScopedVMInitArgs : public StackObj {
3380 private:
3381 JavaVMInitArgs _args;
3382 char* _container_name;
3383 bool _is_set;
3384 char* _vm_options_file_arg;
3385
3386 public:
3387 ScopedVMInitArgs(const char *container_name) {
3388 _args.version = JNI_VERSION_1_2;
3389 _args.nOptions = 0;
3390 _args.options = NULL;
3391 _args.ignoreUnrecognized = false;
3392 _container_name = (char *)container_name;
3393 _is_set = false;
3394 _vm_options_file_arg = NULL;
3395 }
3396
3397 // Populates the JavaVMInitArgs object represented by this
3398 // ScopedVMInitArgs object with the arguments in options. The
3399 // allocated memory is deleted by the destructor. If this method
3400 // returns anything other than JNI_OK, then this object is in a
3401 // partially constructed state, and should be abandoned.
3402 jint set_args(GrowableArray<JavaVMOption>* options) {
3403 _is_set = true;
3404 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3405 JavaVMOption, options->length(), mtArguments);
3406 if (options_arr == NULL) {
3407 return JNI_ENOMEM;
3408 }
3409 _args.options = options_arr;
3410
3411 for (int i = 0; i < options->length(); i++) {
3412 options_arr[i] = options->at(i);
3413 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3414 if (options_arr[i].optionString == NULL) {
3415 // Rely on the destructor to do cleanup.
3416 _args.nOptions = i;
3417 return JNI_ENOMEM;
3418 }
3419 }
3420
3421 _args.nOptions = options->length();
3422 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3423 return JNI_OK;
3424 }
3425
3426 JavaVMInitArgs* get() { return &_args; }
3427 char* container_name() { return _container_name; }
3428 bool is_set() { return _is_set; }
3429 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3430 char* vm_options_file_arg() { return _vm_options_file_arg; }
3431
3432 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3433 if (_vm_options_file_arg != NULL) {
3434 os::free(_vm_options_file_arg);
3435 }
3436 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3437 }
3438
3439 ~ScopedVMInitArgs() {
3440 if (_vm_options_file_arg != NULL) {
3441 os::free(_vm_options_file_arg);
3442 }
3443 if (_args.options == NULL) return;
3444 for (int i = 0; i < _args.nOptions; i++) {
3445 os::free(_args.options[i].optionString);
3446 }
3447 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3448 }
3449
3450 // Insert options into this option list, to replace option at
3451 // vm_options_file_pos (-XX:VMOptionsFile)
3452 jint insert(const JavaVMInitArgs* args,
3453 const JavaVMInitArgs* args_to_insert,
3454 const int vm_options_file_pos) {
3455 assert(_args.options == NULL, "shouldn't be set yet");
3456 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3457 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3458
3459 int length = args->nOptions + args_to_insert->nOptions - 1;
3460 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3461 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3462 for (int i = 0; i < args->nOptions; i++) {
3463 if (i == vm_options_file_pos) {
3464 // insert the new options starting at the same place as the
3465 // -XX:VMOptionsFile option
3466 for (int j = 0; j < args_to_insert->nOptions; j++) {
3467 options->push(args_to_insert->options[j]);
3468 }
3469 } else {
3470 options->push(args->options[i]);
3471 }
3472 }
3473 // make into options array
3474 jint result = set_args(options);
3475 delete options;
3476 return result;
3477 }
3478 };
3479
3480 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3481 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3482 }
3483
3484 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3485 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3486 }
3487
3488 jint Arguments::parse_options_environment_variable(const char* name,
3489 ScopedVMInitArgs* vm_args) {
3490 char *buffer = ::getenv(name);
3491
3492 // Don't check this environment variable if user has special privileges
3493 // (e.g. unix su command).
3494 if (buffer == NULL || os::have_special_privileges()) {
3495 return JNI_OK;
3496 }
3497
3498 if ((buffer = os::strdup(buffer)) == NULL) {
3499 return JNI_ENOMEM;
3500 }
3501
3502 jio_fprintf(defaultStream::error_stream(),
3503 "Picked up %s: %s\n", name, buffer);
3504
3505 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3506
3507 os::free(buffer);
3508 return retcode;
3509 }
3510
3511 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3512 // read file into buffer
3513 int fd = ::open(file_name, O_RDONLY);
3514 if (fd < 0) {
3515 jio_fprintf(defaultStream::error_stream(),
3516 "Could not open options file '%s'\n",
3517 file_name);
3518 return JNI_ERR;
3519 }
3520
3521 struct stat stbuf;
3522 int retcode = os::stat(file_name, &stbuf);
3523 if (retcode != 0) {
3524 jio_fprintf(defaultStream::error_stream(),
3525 "Could not stat options file '%s'\n",
3526 file_name);
3527 os::close(fd);
3528 return JNI_ERR;
3529 }
3530
3531 if (stbuf.st_size == 0) {
3532 // tell caller there is no option data and that is ok
3533 os::close(fd);
3534 return JNI_OK;
3535 }
3536
3537 // '+ 1' for NULL termination even with max bytes
3538 size_t bytes_alloc = stbuf.st_size + 1;
3539
3540 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3541 if (NULL == buf) {
3542 jio_fprintf(defaultStream::error_stream(),
3543 "Could not allocate read buffer for options file parse\n");
3544 os::close(fd);
3545 return JNI_ENOMEM;
3546 }
3547
3548 memset(buf, 0, bytes_alloc);
3549
3550 // Fill buffer
3551 // Use ::read() instead of os::read because os::read()
3552 // might do a thread state transition
3553 // and it is too early for that here
3554
3555 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3556 os::close(fd);
3557 if (bytes_read < 0) {
3558 FREE_C_HEAP_ARRAY(char, buf);
3559 jio_fprintf(defaultStream::error_stream(),
3560 "Could not read options file '%s'\n", file_name);
3561 return JNI_ERR;
3562 }
3563
3564 if (bytes_read == 0) {
3565 // tell caller there is no option data and that is ok
3566 FREE_C_HEAP_ARRAY(char, buf);
3567 return JNI_OK;
3568 }
3569
3570 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3571
3572 FREE_C_HEAP_ARRAY(char, buf);
3573 return retcode;
3574 }
3575
3576 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3577 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3578
3579 // some pointers to help with parsing
3580 char *buffer_end = buffer + buf_len;
3581 char *opt_hd = buffer;
3582 char *wrt = buffer;
3583 char *rd = buffer;
3584
3585 // parse all options
3586 while (rd < buffer_end) {
3587 // skip leading white space from the input string
3588 while (rd < buffer_end && isspace(*rd)) {
3589 rd++;
3590 }
3591
3592 if (rd >= buffer_end) {
3593 break;
3594 }
3595
3596 // Remember this is where we found the head of the token.
3597 opt_hd = wrt;
3598
3599 // Tokens are strings of non white space characters separated
3600 // by one or more white spaces.
3601 while (rd < buffer_end && !isspace(*rd)) {
3602 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3603 int quote = *rd; // matching quote to look for
3604 rd++; // don't copy open quote
3605 while (rd < buffer_end && *rd != quote) {
3606 // include everything (even spaces)
3607 // up until the close quote
3608 *wrt++ = *rd++; // copy to option string
3609 }
3610
3611 if (rd < buffer_end) {
3612 rd++; // don't copy close quote
3613 } else {
3614 // did not see closing quote
3615 jio_fprintf(defaultStream::error_stream(),
3616 "Unmatched quote in %s\n", name);
3617 delete options;
3618 return JNI_ERR;
3619 }
3620 } else {
3621 *wrt++ = *rd++; // copy to option string
3622 }
3623 }
3624
3625 // steal a white space character and set it to NULL
3626 *wrt++ = '\0';
3627 // We now have a complete token
3628
3629 JavaVMOption option;
3630 option.optionString = opt_hd;
3631 option.extraInfo = NULL;
3632
3633 options->append(option); // Fill in option
3634
3635 rd++; // Advance to next character
3636 }
3637
3638 // Fill out JavaVMInitArgs structure.
3639 jint status = vm_args->set_args(options);
3640
3641 delete options;
3642 return status;
3643 }
3644
3645 void Arguments::set_shared_spaces_flags() {
3646 if (DumpSharedSpaces) {
3647 if (FailOverToOldVerifier) {
3648 // Don't fall back to the old verifier on verification failure. If a
3649 // class fails verification with the split verifier, it might fail the
3650 // CDS runtime verifier constraint check. In that case, we don't want
3651 // to share the class. We only archive classes that pass the split verifier.
3652 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3653 }
3654
3655 if (RequireSharedSpaces) {
3656 warning("Cannot dump shared archive while using shared archive");
3657 }
3658 UseSharedSpaces = false;
3659 #ifdef _LP64
3660 if (!UseCompressedOops || !UseCompressedClassPointers) {
3661 vm_exit_during_initialization(
3662 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3663 }
3664 } else {
3665 if (!UseCompressedOops || !UseCompressedClassPointers) {
3666 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3667 }
3668 #endif
3669 }
3670 }
3671
3672 // Sharing support
3673 // Construct the path to the archive
3674 static char* get_shared_archive_path() {
3675 char *shared_archive_path;
3676 if (SharedArchiveFile == NULL) {
3677 char jvm_path[JVM_MAXPATHLEN];
3678 os::jvm_path(jvm_path, sizeof(jvm_path));
3679 char *end = strrchr(jvm_path, *os::file_separator());
3680 if (end != NULL) *end = '\0';
3681 size_t jvm_path_len = strlen(jvm_path);
3682 size_t file_sep_len = strlen(os::file_separator());
3683 const size_t len = jvm_path_len + file_sep_len + 20;
3684 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3685 if (shared_archive_path != NULL) {
3686 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3687 jvm_path, os::file_separator());
3688 }
3689 } else {
3690 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3691 }
3692 return shared_archive_path;
3693 }
3694
3695 #ifndef PRODUCT
3696 // Determine whether LogVMOutput should be implicitly turned on.
3697 static bool use_vm_log() {
3698 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3699 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3700 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3701 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3702 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3703 return true;
3704 }
3705
3706 #ifdef COMPILER1
3707 if (PrintC1Statistics) {
3708 return true;
3709 }
3710 #endif // COMPILER1
3711
3712 #ifdef COMPILER2
3713 if (PrintOptoAssembly || PrintOptoStatistics) {
3714 return true;
3715 }
3716 #endif // COMPILER2
3717
3718 return false;
3719 }
3720
3721 #endif // PRODUCT
3722
3723 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3724 for (int index = 0; index < args->nOptions; index++) {
3725 const JavaVMOption* option = args->options + index;
3726 const char* tail;
3727 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3728 return true;
3729 }
3730 }
3731 return false;
3732 }
3733
3734 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3735 const char* vm_options_file,
3736 const int vm_options_file_pos,
3737 ScopedVMInitArgs* vm_options_file_args,
3738 ScopedVMInitArgs* args_out) {
3739 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3740 if (code != JNI_OK) {
3741 return code;
3742 }
3743
3744 if (vm_options_file_args->get()->nOptions < 1) {
3745 return JNI_OK;
3746 }
3747
3748 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3749 jio_fprintf(defaultStream::error_stream(),
3750 "A VM options file may not refer to a VM options file. "
3751 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3752 "options file '%s' in options container '%s' is an error.\n",
3753 vm_options_file_args->vm_options_file_arg(),
3754 vm_options_file_args->container_name());
3755 return JNI_EINVAL;
3756 }
3757
3758 return args_out->insert(args, vm_options_file_args->get(),
3759 vm_options_file_pos);
3760 }
3761
3762 // Expand -XX:VMOptionsFile found in args_in as needed.
3763 // mod_args and args_out parameters may return values as needed.
3764 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3765 ScopedVMInitArgs* mod_args,
3766 JavaVMInitArgs** args_out) {
3767 jint code = match_special_option_and_act(args_in, mod_args);
3768 if (code != JNI_OK) {
3769 return code;
3770 }
3771
3772 if (mod_args->is_set()) {
3773 // args_in contains -XX:VMOptionsFile and mod_args contains the
3774 // original options from args_in along with the options expanded
3775 // from the VMOptionsFile. Return a short-hand to the caller.
3776 *args_out = mod_args->get();
3777 } else {
3778 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3779 }
3780 return JNI_OK;
3781 }
3782
3783 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3784 ScopedVMInitArgs* args_out) {
3785 // Remaining part of option string
3786 const char* tail;
3787 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3788
3789 for (int index = 0; index < args->nOptions; index++) {
3790 const JavaVMOption* option = args->options + index;
3791 if (ArgumentsExt::process_options(option)) {
3792 continue;
3793 }
3794 if (match_option(option, "-XX:Flags=", &tail)) {
3795 Arguments::set_jvm_flags_file(tail);
3796 continue;
3797 }
3798 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3799 if (vm_options_file_args.found_vm_options_file_arg()) {
3800 jio_fprintf(defaultStream::error_stream(),
3801 "The option '%s' is already specified in the options "
3802 "container '%s' so the specification of '%s' in the "
3803 "same options container is an error.\n",
3804 vm_options_file_args.vm_options_file_arg(),
3805 vm_options_file_args.container_name(),
3806 option->optionString);
3807 return JNI_EINVAL;
3808 }
3809 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3810 // If there's a VMOptionsFile, parse that
3811 jint code = insert_vm_options_file(args, tail, index,
3812 &vm_options_file_args, args_out);
3813 if (code != JNI_OK) {
3814 return code;
3815 }
3816 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3817 if (args_out->is_set()) {
3818 // The VMOptions file inserted some options so switch 'args'
3819 // to the new set of options, and continue processing which
3820 // preserves "last option wins" semantics.
3821 args = args_out->get();
3822 // The first option from the VMOptionsFile replaces the
3823 // current option. So we back track to process the
3824 // replacement option.
3825 index--;
3826 }
3827 continue;
3828 }
3829 if (match_option(option, "-XX:+PrintVMOptions")) {
3830 PrintVMOptions = true;
3831 continue;
3832 }
3833 if (match_option(option, "-XX:-PrintVMOptions")) {
3834 PrintVMOptions = false;
3835 continue;
3836 }
3837 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3838 IgnoreUnrecognizedVMOptions = true;
3839 continue;
3840 }
3841 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3842 IgnoreUnrecognizedVMOptions = false;
3843 continue;
3844 }
3845 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3846 CommandLineFlags::printFlags(tty, false);
3847 vm_exit(0);
3848 }
3849 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3850 #if INCLUDE_NMT
3851 // The launcher did not setup nmt environment variable properly.
3852 if (!MemTracker::check_launcher_nmt_support(tail)) {
3853 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3854 }
3855
3856 // Verify if nmt option is valid.
3857 if (MemTracker::verify_nmt_option()) {
3858 // Late initialization, still in single-threaded mode.
3859 if (MemTracker::tracking_level() >= NMT_summary) {
3860 MemTracker::init();
3861 }
3862 } else {
3863 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3864 }
3865 continue;
3866 #else
3867 jio_fprintf(defaultStream::error_stream(),
3868 "Native Memory Tracking is not supported in this VM\n");
3869 return JNI_ERR;
3870 #endif
3871 }
3872
3873 #ifndef PRODUCT
3874 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3875 CommandLineFlags::printFlags(tty, true);
3876 vm_exit(0);
3877 }
3878 #endif
3879 }
3880 return JNI_OK;
3881 }
3882
3883 static void print_options(const JavaVMInitArgs *args) {
3884 const char* tail;
3885 for (int index = 0; index < args->nOptions; index++) {
3886 const JavaVMOption *option = args->options + index;
3887 if (match_option(option, "-XX:", &tail)) {
3888 logOption(tail);
3889 }
3890 }
3891 }
3892
3893 bool Arguments::handle_deprecated_print_gc_flags() {
3894 if (PrintGC) {
3895 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3896 }
3897 if (PrintGCDetails) {
3898 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3899 }
3900
3901 if (_gc_log_filename != NULL) {
3902 // -Xloggc was used to specify a filename
3903 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3904
3905 LogTarget(Error, logging) target;
3906 LogStream errstream(target);
3907 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3908 } else if (PrintGC || PrintGCDetails) {
3909 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3910 }
3911 return true;
3912 }
3913
3914 void Arguments::handle_extra_cms_flags(const char* msg) {
3915 SpecialFlag flag;
3916 const char *flag_name = "UseConcMarkSweepGC";
3917 if (lookup_special_flag(flag_name, flag)) {
3918 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3919 warning("%s", msg);
3920 }
3921 }
3922
3923 // Parse entry point called from JNI_CreateJavaVM
3924
3925 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3926 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3927
3928 // Initialize ranges, constraints and writeables
3929 CommandLineFlagRangeList::init();
3930 CommandLineFlagConstraintList::init();
3931 CommandLineFlagWriteableList::init();
3932
3933 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3934 const char* hotspotrc = ".hotspotrc";
3935 bool settings_file_specified = false;
3936 bool needs_hotspotrc_warning = false;
3937 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3938 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3939
3940 // Pointers to current working set of containers
3941 JavaVMInitArgs* cur_cmd_args;
3942 JavaVMInitArgs* cur_java_options_args;
3943 JavaVMInitArgs* cur_java_tool_options_args;
3944
3945 // Containers for modified/expanded options
3946 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3947 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3948 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3949
3950
3951 jint code =
3952 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3953 if (code != JNI_OK) {
3954 return code;
3955 }
3956
3957 code = parse_java_options_environment_variable(&initial_java_options_args);
3958 if (code != JNI_OK) {
3959 return code;
3960 }
3961
3962 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3963 &mod_java_tool_options_args,
3964 &cur_java_tool_options_args);
3965 if (code != JNI_OK) {
3966 return code;
3967 }
3968
3969 code = expand_vm_options_as_needed(initial_cmd_args,
3970 &mod_cmd_args,
3971 &cur_cmd_args);
3972 if (code != JNI_OK) {
3973 return code;
3974 }
3975
3976 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3977 &mod_java_options_args,
3978 &cur_java_options_args);
3979 if (code != JNI_OK) {
3980 return code;
3981 }
3982
3983 const char* flags_file = Arguments::get_jvm_flags_file();
3984 settings_file_specified = (flags_file != NULL);
3985
3986 if (IgnoreUnrecognizedVMOptions) {
3987 cur_cmd_args->ignoreUnrecognized = true;
3988 cur_java_tool_options_args->ignoreUnrecognized = true;
3989 cur_java_options_args->ignoreUnrecognized = true;
3990 }
3991
3992 // Parse specified settings file
3993 if (settings_file_specified) {
3994 if (!process_settings_file(flags_file, true,
3995 cur_cmd_args->ignoreUnrecognized)) {
3996 return JNI_EINVAL;
3997 }
3998 } else {
3999 #ifdef ASSERT
4000 // Parse default .hotspotrc settings file
4001 if (!process_settings_file(".hotspotrc", false,
4002 cur_cmd_args->ignoreUnrecognized)) {
4003 return JNI_EINVAL;
4004 }
4005 #else
4006 struct stat buf;
4007 if (os::stat(hotspotrc, &buf) == 0) {
4008 needs_hotspotrc_warning = true;
4009 }
4010 #endif
4011 }
4012
4013 if (PrintVMOptions) {
4014 print_options(cur_java_tool_options_args);
4015 print_options(cur_cmd_args);
4016 print_options(cur_java_options_args);
4017 }
4018
4019 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4020 jint result = parse_vm_init_args(cur_java_tool_options_args,
4021 cur_java_options_args,
4022 cur_cmd_args);
4023
4024 if (result != JNI_OK) {
4025 return result;
4026 }
4027
4028 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4029 SharedArchivePath = get_shared_archive_path();
4030 if (SharedArchivePath == NULL) {
4031 return JNI_ENOMEM;
4032 }
4033
4034 // Set up VerifySharedSpaces
4035 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4036 VerifySharedSpaces = true;
4037 }
4038
4039 // Delay warning until here so that we've had a chance to process
4040 // the -XX:-PrintWarnings flag
4041 if (needs_hotspotrc_warning) {
4042 warning("%s file is present but has been ignored. "
4043 "Run with -XX:Flags=%s to load the file.",
4044 hotspotrc, hotspotrc);
4045 }
4046
4047 if (needs_module_property_warning) {
4048 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4049 " names that are reserved for internal use.");
4050 }
4051
4052 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4053 UNSUPPORTED_OPTION(UseLargePages);
4054 #endif
4055
4056 ArgumentsExt::report_unsupported_options();
4057
4058 #ifndef PRODUCT
4059 if (TraceBytecodesAt != 0) {
4060 TraceBytecodes = true;
4061 }
4062 if (CountCompiledCalls) {
4063 if (UseCounterDecay) {
4064 warning("UseCounterDecay disabled because CountCalls is set");
4065 UseCounterDecay = false;
4066 }
4067 }
4068 #endif // PRODUCT
4069
4070 if (ScavengeRootsInCode == 0) {
4071 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4072 warning("Forcing ScavengeRootsInCode non-zero");
4073 }
4074 ScavengeRootsInCode = 1;
4075 }
4076
4077 if (!handle_deprecated_print_gc_flags()) {
4078 return JNI_EINVAL;
4079 }
4080
4081 // Set object alignment values.
4082 set_object_alignment();
4083
4084 #if !INCLUDE_CDS
4085 if (DumpSharedSpaces || RequireSharedSpaces) {
4086 jio_fprintf(defaultStream::error_stream(),
4087 "Shared spaces are not supported in this VM\n");
4088 return JNI_ERR;
4089 }
4090 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4091 log_is_enabled(Info, cds)) {
4092 warning("Shared spaces are not supported in this VM");
4093 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4094 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4095 }
4096 no_shared_spaces("CDS Disabled");
4097 #endif // INCLUDE_CDS
4098
4099 return JNI_OK;
4100 }
4101
4102 jint Arguments::apply_ergo() {
4103 // Set flags based on ergonomics.
4104 jint result = set_ergonomics_flags();
4105 if (result != JNI_OK) return result;
4106
4107 #if INCLUDE_JVMCI
4108 set_jvmci_specific_flags();
4109 #endif
4110
4111 set_shared_spaces_flags();
4112
4113 // Check the GC selections again.
4114 if (!check_gc_consistency()) {
4115 return JNI_EINVAL;
4116 }
4117
4118 if (TieredCompilation) {
4119 set_tiered_flags();
4120 } else {
4121 int max_compilation_policy_choice = 1;
4122 #ifdef COMPILER2
4123 if (is_server_compilation_mode_vm()) {
4124 max_compilation_policy_choice = 2;
4125 }
4126 #endif
4127 // Check if the policy is valid.
4128 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4129 vm_exit_during_initialization(
4130 "Incompatible compilation policy selected", NULL);
4131 }
4132 // Scale CompileThreshold
4133 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4134 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4135 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4136 }
4137 }
4138
4139 #ifdef COMPILER2
4140 #ifndef PRODUCT
4141 if (PrintIdealGraphLevel > 0) {
4142 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4143 }
4144 #endif
4145 #endif
4146
4147 // Set heap size based on available physical memory
4148 set_heap_size();
4149
4150 ArgumentsExt::set_gc_specific_flags();
4151
4152 // Initialize Metaspace flags and alignments
4153 Metaspace::ergo_initialize();
4154
4155 // Set bytecode rewriting flags
4156 set_bytecode_flags();
4157
4158 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4159 jint code = set_aggressive_opts_flags();
4160 if (code != JNI_OK) {
4161 return code;
4162 }
4163
4164 // Turn off biased locking for locking debug mode flags,
4165 // which are subtly different from each other but neither works with
4166 // biased locking
4167 if (UseHeavyMonitors
4168 #ifdef COMPILER1
4169 || !UseFastLocking
4170 #endif // COMPILER1
4171 #if INCLUDE_JVMCI
4172 || !JVMCIUseFastLocking
4173 #endif
4174 ) {
4175 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4176 // flag set to true on command line; warn the user that they
4177 // can't enable biased locking here
4178 warning("Biased Locking is not supported with locking debug flags"
4179 "; ignoring UseBiasedLocking flag." );
4180 }
4181 UseBiasedLocking = false;
4182 }
4183
4184 #ifdef CC_INTERP
4185 // Clear flags not supported on zero.
4186 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4187 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4188 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4189 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4190 #endif // CC_INTERP
4191
4192 #ifdef COMPILER2
4193 if (!EliminateLocks) {
4194 EliminateNestedLocks = false;
4195 }
4196 if (!Inline) {
4197 IncrementalInline = false;
4198 }
4199 #ifndef PRODUCT
4200 if (!IncrementalInline) {
4201 AlwaysIncrementalInline = false;
4202 }
4203 #endif
4204 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4205 // nothing to use the profiling, turn if off
4206 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4207 }
4208 #endif
4209
4210 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4211 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4212 DebugNonSafepoints = true;
4213 }
4214
4215 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4216 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4217 }
4218
4219 if (UseOnStackReplacement && !UseLoopCounter) {
4220 warning("On-stack-replacement requires loop counters; enabling loop counters");
4221 FLAG_SET_DEFAULT(UseLoopCounter, true);
4222 }
4223
4224 #ifndef PRODUCT
4225 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4226 if (use_vm_log()) {
4227 LogVMOutput = true;
4228 }
4229 }
4230 #endif // PRODUCT
4231
4232 if (PrintCommandLineFlags) {
4233 CommandLineFlags::printSetFlags(tty);
4234 }
4235
4236 // Apply CPU specific policy for the BiasedLocking
4237 if (UseBiasedLocking) {
4238 if (!VM_Version::use_biased_locking() &&
4239 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4240 UseBiasedLocking = false;
4241 }
4242 }
4243 #ifdef COMPILER2
4244 if (!UseBiasedLocking || EmitSync != 0) {
4245 UseOptoBiasInlining = false;
4246 }
4247 #endif
4248
4249 bool aot_enabled = UseAOT && AOTLibrary != NULL;
4250 bool jvmci_enabled = NOT_JVMCI(false) JVMCI_ONLY(EnableJVMCI || UseJVMCICompiler);
4251 bool handshakes_supported = SafepointMechanism::supports_thread_local_poll() && !aot_enabled && !jvmci_enabled && ThreadLocalHandshakes;
4252 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4253 // Here we try to figure out if a mutual exclusive option have been set that conflict with a default.
4254 if (handshakes_supported) {
4255 FLAG_SET_DEFAULT(UseAOT, false); // Clear the AOT flag to make sure it doesn't try to initialize.
4256 } else {
4257 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) && ThreadLocalHandshakes) {
4258 if (aot_enabled) {
4259 // If user enabled AOT but ThreadLocalHandshakes is at default set it to false.
4260 log_debug(ergo)("Disabling ThreadLocalHandshakes for UseAOT.");
4261 FLAG_SET_DEFAULT(ThreadLocalHandshakes, false);
4262 } else if (jvmci_enabled){
4263 // If user enabled JVMCI but ThreadLocalHandshakes is at default set it to false.
4264 log_debug(ergo)("Disabling ThreadLocalHandshakes for EnableJVMCI/UseJVMCICompiler.");
4265 FLAG_SET_DEFAULT(ThreadLocalHandshakes, false);
4266 }
4267 }
4268 }
4269 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4270 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4271 } else {
4272 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4273 }
4274
4275 return JNI_OK;
4276 }
4277
4278 jint Arguments::adjust_after_os() {
4279 if (UseNUMA) {
4280 if (UseParallelGC || UseParallelOldGC) {
4281 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4282 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4283 }
4284 }
4285 // UseNUMAInterleaving is set to ON for all collectors and
4286 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4287 // such as the parallel collector for Linux and Solaris will
4288 // interleave old gen and survivor spaces on top of NUMA
4289 // allocation policy for the eden space.
4290 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4291 // all platforms and ParallelGC on Windows will interleave all
4292 // of the heap spaces across NUMA nodes.
4293 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4294 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4295 }
4296 }
4297 return JNI_OK;
4298 }
4299
4300 int Arguments::PropertyList_count(SystemProperty* pl) {
4301 int count = 0;
4302 while(pl != NULL) {
4303 count++;
4304 pl = pl->next();
4305 }
4306 return count;
4307 }
4308
4309 // Return the number of readable properties.
4310 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4311 int count = 0;
4312 while(pl != NULL) {
4313 if (pl->is_readable()) {
4314 count++;
4315 }
4316 pl = pl->next();
4317 }
4318 return count;
4319 }
4320
4321 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4322 assert(key != NULL, "just checking");
4323 SystemProperty* prop;
4324 for (prop = pl; prop != NULL; prop = prop->next()) {
4325 if (strcmp(key, prop->key()) == 0) return prop->value();
4326 }
4327 return NULL;
4328 }
4329
4330 // Return the value of the requested property provided that it is a readable property.
4331 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4332 assert(key != NULL, "just checking");
4333 SystemProperty* prop;
4334 // Return the property value if the keys match and the property is not internal or
4335 // it's the special internal property "jdk.boot.class.path.append".
4336 for (prop = pl; prop != NULL; prop = prop->next()) {
4337 if (strcmp(key, prop->key()) == 0) {
4338 if (!prop->internal()) {
4339 return prop->value();
4340 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4341 return prop->value();
4342 } else {
4343 // Property is internal and not jdk.boot.class.path.append so return NULL.
4344 return NULL;
4345 }
4346 }
4347 }
4348 return NULL;
4349 }
4350
4351 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4352 int count = 0;
4353 const char* ret_val = NULL;
4354
4355 while(pl != NULL) {
4356 if(count >= index) {
4357 ret_val = pl->key();
4358 break;
4359 }
4360 count++;
4361 pl = pl->next();
4362 }
4363
4364 return ret_val;
4365 }
4366
4367 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4368 int count = 0;
4369 char* ret_val = NULL;
4370
4371 while(pl != NULL) {
4372 if(count >= index) {
4373 ret_val = pl->value();
4374 break;
4375 }
4376 count++;
4377 pl = pl->next();
4378 }
4379
4380 return ret_val;
4381 }
4382
4383 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4384 SystemProperty* p = *plist;
4385 if (p == NULL) {
4386 *plist = new_p;
4387 } else {
4388 while (p->next() != NULL) {
4389 p = p->next();
4390 }
4391 p->set_next(new_p);
4392 }
4393 }
4394
4395 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4396 bool writeable, bool internal) {
4397 if (plist == NULL)
4398 return;
4399
4400 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4401 PropertyList_add(plist, new_p);
4402 }
4403
4404 void Arguments::PropertyList_add(SystemProperty *element) {
4405 PropertyList_add(&_system_properties, element);
4406 }
4407
4408 // This add maintains unique property key in the list.
4409 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4410 PropertyAppendable append, PropertyWriteable writeable,
4411 PropertyInternal internal) {
4412 if (plist == NULL)
4413 return;
4414
4415 // If property key exist then update with new value.
4416 SystemProperty* prop;
4417 for (prop = *plist; prop != NULL; prop = prop->next()) {
4418 if (strcmp(k, prop->key()) == 0) {
4419 if (append == AppendProperty) {
4420 prop->append_value(v);
4421 } else {
4422 prop->set_value(v);
4423 }
4424 return;
4425 }
4426 }
4427
4428 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4429 }
4430
4431 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4432 // Returns true if all of the source pointed by src has been copied over to
4433 // the destination buffer pointed by buf. Otherwise, returns false.
4434 // Notes:
4435 // 1. If the length (buflen) of the destination buffer excluding the
4436 // NULL terminator character is not long enough for holding the expanded
4437 // pid characters, it also returns false instead of returning the partially
4438 // expanded one.
4439 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4440 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4441 char* buf, size_t buflen) {
4442 const char* p = src;
4443 char* b = buf;
4444 const char* src_end = &src[srclen];
4445 char* buf_end = &buf[buflen - 1];
4446
4447 while (p < src_end && b < buf_end) {
4448 if (*p == '%') {
4449 switch (*(++p)) {
4450 case '%': // "%%" ==> "%"
4451 *b++ = *p++;
4452 break;
4453 case 'p': { // "%p" ==> current process id
4454 // buf_end points to the character before the last character so
4455 // that we could write '\0' to the end of the buffer.
4456 size_t buf_sz = buf_end - b + 1;
4457 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4458
4459 // if jio_snprintf fails or the buffer is not long enough to hold
4460 // the expanded pid, returns false.
4461 if (ret < 0 || ret >= (int)buf_sz) {
4462 return false;
4463 } else {
4464 b += ret;
4465 assert(*b == '\0', "fail in copy_expand_pid");
4466 if (p == src_end && b == buf_end + 1) {
4467 // reach the end of the buffer.
4468 return true;
4469 }
4470 }
4471 p++;
4472 break;
4473 }
4474 default :
4475 *b++ = '%';
4476 }
4477 } else {
4478 *b++ = *p++;
4479 }
4480 }
4481 *b = '\0';
4482 return (p == src_end); // return false if not all of the source was copied
4483 }