Mon, 09 Mar 2020 12:54:53 +0000
8240295: hs_err elapsed time in seconds is not accurate enough
Reviewed-by: dholmes, sspitsyn
1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #if INCLUDE_JFR
48 #include "jfr/jfr.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_linux
51 # include "os_linux.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_solaris
54 # include "os_solaris.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_windows
57 # include "os_windows.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_aix
60 # include "os_aix.inline.hpp"
61 #endif
62 #ifdef TARGET_OS_FAMILY_bsd
63 # include "os_bsd.inline.hpp"
64 #endif
65 #if INCLUDE_ALL_GCS
66 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
67 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
68 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
69 #endif // INCLUDE_ALL_GCS
71 // Note: This is a special bug reporting site for the JVM
72 #ifdef VENDOR_URL_VM_BUG
73 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
74 #else
75 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
76 #endif
77 #define DEFAULT_JAVA_LAUNCHER "generic"
79 // Disable options not supported in this release, with a warning if they
80 // were explicitly requested on the command-line
81 #define UNSUPPORTED_OPTION(opt, description) \
82 do { \
83 if (opt) { \
84 if (FLAG_IS_CMDLINE(opt)) { \
85 warning(description " is disabled in this release."); \
86 } \
87 FLAG_SET_DEFAULT(opt, false); \
88 } \
89 } while(0)
91 #define UNSUPPORTED_GC_OPTION(gc) \
92 do { \
93 if (gc) { \
94 if (FLAG_IS_CMDLINE(gc)) { \
95 warning(#gc " is not supported in this VM. Using Serial GC."); \
96 } \
97 FLAG_SET_DEFAULT(gc, false); \
98 } \
99 } while(0)
101 char** Arguments::_jvm_flags_array = NULL;
102 int Arguments::_num_jvm_flags = 0;
103 char** Arguments::_jvm_args_array = NULL;
104 int Arguments::_num_jvm_args = 0;
105 char* Arguments::_java_command = NULL;
106 SystemProperty* Arguments::_system_properties = NULL;
107 const char* Arguments::_gc_log_filename = NULL;
108 bool Arguments::_has_profile = false;
109 size_t Arguments::_conservative_max_heap_alignment = 0;
110 uintx Arguments::_min_heap_size = 0;
111 uintx Arguments::_min_heap_free_ratio = 0;
112 uintx Arguments::_max_heap_free_ratio = 0;
113 Arguments::Mode Arguments::_mode = _mixed;
114 bool Arguments::_java_compiler = false;
115 bool Arguments::_xdebug_mode = false;
116 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
117 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
118 int Arguments::_sun_java_launcher_pid = -1;
119 bool Arguments::_created_by_gamma_launcher = false;
121 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
122 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
123 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
124 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
125 bool Arguments::_ClipInlining = ClipInlining;
127 char* Arguments::SharedArchivePath = NULL;
129 AgentLibraryList Arguments::_libraryList;
130 AgentLibraryList Arguments::_agentList;
132 abort_hook_t Arguments::_abort_hook = NULL;
133 exit_hook_t Arguments::_exit_hook = NULL;
134 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
137 SystemProperty *Arguments::_java_ext_dirs = NULL;
138 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
139 SystemProperty *Arguments::_sun_boot_library_path = NULL;
140 SystemProperty *Arguments::_java_library_path = NULL;
141 SystemProperty *Arguments::_java_home = NULL;
142 SystemProperty *Arguments::_java_class_path = NULL;
143 SystemProperty *Arguments::_sun_boot_class_path = NULL;
145 char* Arguments::_meta_index_path = NULL;
146 char* Arguments::_meta_index_dir = NULL;
148 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
150 static bool match_option(const JavaVMOption *option, const char* name,
151 const char** tail) {
152 int len = (int)strlen(name);
153 if (strncmp(option->optionString, name, len) == 0) {
154 *tail = option->optionString + len;
155 return true;
156 } else {
157 return false;
158 }
159 }
161 #if INCLUDE_JFR
162 // return true on failure
163 static bool match_jfr_option(const JavaVMOption** option) {
164 assert((*option)->optionString != NULL, "invariant");
165 char* tail = NULL;
166 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
167 return Jfr::on_start_flight_recording_option(option, tail);
168 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
169 return Jfr::on_flight_recorder_option(option, tail);
170 }
171 return false;
172 }
173 #endif
175 static void logOption(const char* opt) {
176 if (PrintVMOptions) {
177 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
178 }
179 }
181 // Process java launcher properties.
182 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
183 // See if sun.java.launcher or sun.java.launcher.pid is defined.
184 // Must do this before setting up other system properties,
185 // as some of them may depend on launcher type.
186 for (int index = 0; index < args->nOptions; index++) {
187 const JavaVMOption* option = args->options + index;
188 const char* tail;
190 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
191 process_java_launcher_argument(tail, option->extraInfo);
192 continue;
193 }
194 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
195 _sun_java_launcher_pid = atoi(tail);
196 continue;
197 }
198 }
199 }
201 // Initialize system properties key and value.
202 void Arguments::init_system_properties() {
204 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
205 "Java Virtual Machine Specification", false));
206 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
208 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
210 // following are JVMTI agent writeable properties.
211 // Properties values are set to NULL and they are
212 // os specific they are initialized in os::init_system_properties_values().
213 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
214 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
215 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
216 _java_library_path = new SystemProperty("java.library.path", NULL, true);
217 _java_home = new SystemProperty("java.home", NULL, true);
218 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
220 _java_class_path = new SystemProperty("java.class.path", "", true);
222 // Add to System Property list.
223 PropertyList_add(&_system_properties, _java_ext_dirs);
224 PropertyList_add(&_system_properties, _java_endorsed_dirs);
225 PropertyList_add(&_system_properties, _sun_boot_library_path);
226 PropertyList_add(&_system_properties, _java_library_path);
227 PropertyList_add(&_system_properties, _java_home);
228 PropertyList_add(&_system_properties, _java_class_path);
229 PropertyList_add(&_system_properties, _sun_boot_class_path);
231 // Set OS specific system properties values
232 os::init_system_properties_values();
233 }
236 // Update/Initialize System properties after JDK version number is known
237 void Arguments::init_version_specific_system_properties() {
238 enum { bufsz = 16 };
239 char buffer[bufsz];
240 const char* spec_vendor = "Sun Microsystems Inc.";
241 uint32_t spec_version = 0;
243 if (JDK_Version::is_gte_jdk17x_version()) {
244 spec_vendor = "Oracle Corporation";
245 spec_version = JDK_Version::current().major_version();
246 }
247 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
249 PropertyList_add(&_system_properties,
250 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
251 PropertyList_add(&_system_properties,
252 new SystemProperty("java.vm.specification.version", buffer, false));
253 PropertyList_add(&_system_properties,
254 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
255 }
257 /**
258 * Provide a slightly more user-friendly way of eliminating -XX flags.
259 * When a flag is eliminated, it can be added to this list in order to
260 * continue accepting this flag on the command-line, while issuing a warning
261 * and ignoring the value. Once the JDK version reaches the 'accept_until'
262 * limit, we flatly refuse to admit the existence of the flag. This allows
263 * a flag to die correctly over JDK releases using HSX.
264 */
265 typedef struct {
266 const char* name;
267 JDK_Version obsoleted_in; // when the flag went away
268 JDK_Version accept_until; // which version to start denying the existence
269 } ObsoleteFlag;
271 static ObsoleteFlag obsolete_jvm_flags[] = {
272 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
273 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
274 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
275 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
276 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
277 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
278 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
279 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
280 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
281 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
282 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
283 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
284 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
285 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
286 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
287 { "DefaultInitialRAMFraction",
288 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
289 { "UseDepthFirstScavengeOrder",
290 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
291 { "HandlePromotionFailure",
292 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
293 { "MaxLiveObjectEvacuationRatio",
294 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
295 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
296 { "UseParallelOldGCCompacting",
297 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
298 { "UseParallelDensePrefixUpdate",
299 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
300 { "UseParallelOldGCDensePrefix",
301 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
302 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
303 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
304 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
305 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
306 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
307 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
309 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
312 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
313 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
314 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
315 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
316 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
317 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
318 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
319 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
320 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
321 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
322 { "UseOldInlining", JDK_Version::jdk_update(8, 20), JDK_Version::jdk(10) },
323 { "AutoShutdownNMT", JDK_Version::jdk_update(8, 40), JDK_Version::jdk(10) },
324 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
325 { "SegmentedHeapDumpThreshold", JDK_Version::jdk_update(8, 252), JDK_Version::jdk(10) },
326 #ifdef PRODUCT
327 { "DesiredMethodLimit",
328 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
329 #endif // PRODUCT
330 { NULL, JDK_Version(0), JDK_Version(0) }
331 };
333 // Returns true if the flag is obsolete and fits into the range specified
334 // for being ignored. In the case that the flag is ignored, the 'version'
335 // value is filled in with the version number when the flag became
336 // obsolete so that that value can be displayed to the user.
337 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
338 int i = 0;
339 assert(version != NULL, "Must provide a version buffer");
340 while (obsolete_jvm_flags[i].name != NULL) {
341 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
342 // <flag>=xxx form
343 // [-|+]<flag> form
344 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
345 ((s[0] == '+' || s[0] == '-') &&
346 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
347 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
348 *version = flag_status.obsoleted_in;
349 return true;
350 }
351 }
352 i++;
353 }
354 return false;
355 }
357 // Constructs the system class path (aka boot class path) from the following
358 // components, in order:
359 //
360 // prefix // from -Xbootclasspath/p:...
361 // endorsed // the expansion of -Djava.endorsed.dirs=...
362 // base // from os::get_system_properties() or -Xbootclasspath=
363 // suffix // from -Xbootclasspath/a:...
364 //
365 // java.endorsed.dirs is a list of directories; any jar or zip files in the
366 // directories are added to the sysclasspath just before the base.
367 //
368 // This could be AllStatic, but it isn't needed after argument processing is
369 // complete.
370 class SysClassPath: public StackObj {
371 public:
372 SysClassPath(const char* base);
373 ~SysClassPath();
375 inline void set_base(const char* base);
376 inline void add_prefix(const char* prefix);
377 inline void add_suffix_to_prefix(const char* suffix);
378 inline void add_suffix(const char* suffix);
379 inline void reset_path(const char* base);
381 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
382 // property. Must be called after all command-line arguments have been
383 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
384 // combined_path().
385 void expand_endorsed();
387 inline const char* get_base() const { return _items[_scp_base]; }
388 inline const char* get_prefix() const { return _items[_scp_prefix]; }
389 inline const char* get_suffix() const { return _items[_scp_suffix]; }
390 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
392 // Combine all the components into a single c-heap-allocated string; caller
393 // must free the string if/when no longer needed.
394 char* combined_path();
396 private:
397 // Utility routines.
398 static char* add_to_path(const char* path, const char* str, bool prepend);
399 static char* add_jars_to_path(char* path, const char* directory);
401 inline void reset_item_at(int index);
403 // Array indices for the items that make up the sysclasspath. All except the
404 // base are allocated in the C heap and freed by this class.
405 enum {
406 _scp_prefix, // from -Xbootclasspath/p:...
407 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
408 _scp_base, // the default sysclasspath
409 _scp_suffix, // from -Xbootclasspath/a:...
410 _scp_nitems // the number of items, must be last.
411 };
413 const char* _items[_scp_nitems];
414 DEBUG_ONLY(bool _expansion_done;)
415 };
417 SysClassPath::SysClassPath(const char* base) {
418 memset(_items, 0, sizeof(_items));
419 _items[_scp_base] = base;
420 DEBUG_ONLY(_expansion_done = false;)
421 }
423 SysClassPath::~SysClassPath() {
424 // Free everything except the base.
425 for (int i = 0; i < _scp_nitems; ++i) {
426 if (i != _scp_base) reset_item_at(i);
427 }
428 DEBUG_ONLY(_expansion_done = false;)
429 }
431 inline void SysClassPath::set_base(const char* base) {
432 _items[_scp_base] = base;
433 }
435 inline void SysClassPath::add_prefix(const char* prefix) {
436 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
437 }
439 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
440 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
441 }
443 inline void SysClassPath::add_suffix(const char* suffix) {
444 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
445 }
447 inline void SysClassPath::reset_item_at(int index) {
448 assert(index < _scp_nitems && index != _scp_base, "just checking");
449 if (_items[index] != NULL) {
450 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
451 _items[index] = NULL;
452 }
453 }
455 inline void SysClassPath::reset_path(const char* base) {
456 // Clear the prefix and suffix.
457 reset_item_at(_scp_prefix);
458 reset_item_at(_scp_suffix);
459 set_base(base);
460 }
462 //------------------------------------------------------------------------------
464 void SysClassPath::expand_endorsed() {
465 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
467 const char* path = Arguments::get_property("java.endorsed.dirs");
468 if (path == NULL) {
469 path = Arguments::get_endorsed_dir();
470 assert(path != NULL, "no default for java.endorsed.dirs");
471 }
473 char* expanded_path = NULL;
474 const char separator = *os::path_separator();
475 const char* const end = path + strlen(path);
476 while (path < end) {
477 const char* tmp_end = strchr(path, separator);
478 if (tmp_end == NULL) {
479 expanded_path = add_jars_to_path(expanded_path, path);
480 path = end;
481 } else {
482 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
483 memcpy(dirpath, path, tmp_end - path);
484 dirpath[tmp_end - path] = '\0';
485 expanded_path = add_jars_to_path(expanded_path, dirpath);
486 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
487 path = tmp_end + 1;
488 }
489 }
490 _items[_scp_endorsed] = expanded_path;
491 DEBUG_ONLY(_expansion_done = true;)
492 }
494 // Combine the bootclasspath elements, some of which may be null, into a single
495 // c-heap-allocated string.
496 char* SysClassPath::combined_path() {
497 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
498 assert(_expansion_done, "must call expand_endorsed() first.");
500 size_t lengths[_scp_nitems];
501 size_t total_len = 0;
503 const char separator = *os::path_separator();
505 // Get the lengths.
506 int i;
507 for (i = 0; i < _scp_nitems; ++i) {
508 if (_items[i] != NULL) {
509 lengths[i] = strlen(_items[i]);
510 // Include space for the separator char (or a NULL for the last item).
511 total_len += lengths[i] + 1;
512 }
513 }
514 assert(total_len > 0, "empty sysclasspath not allowed");
516 // Copy the _items to a single string.
517 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
518 char* cp_tmp = cp;
519 for (i = 0; i < _scp_nitems; ++i) {
520 if (_items[i] != NULL) {
521 memcpy(cp_tmp, _items[i], lengths[i]);
522 cp_tmp += lengths[i];
523 *cp_tmp++ = separator;
524 }
525 }
526 *--cp_tmp = '\0'; // Replace the extra separator.
527 return cp;
528 }
530 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
531 char*
532 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
533 char *cp;
535 assert(str != NULL, "just checking");
536 if (path == NULL) {
537 size_t len = strlen(str) + 1;
538 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
539 memcpy(cp, str, len); // copy the trailing null
540 } else {
541 const char separator = *os::path_separator();
542 size_t old_len = strlen(path);
543 size_t str_len = strlen(str);
544 size_t len = old_len + str_len + 2;
546 if (prepend) {
547 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
548 char* cp_tmp = cp;
549 memcpy(cp_tmp, str, str_len);
550 cp_tmp += str_len;
551 *cp_tmp = separator;
552 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
553 FREE_C_HEAP_ARRAY(char, path, mtInternal);
554 } else {
555 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
556 char* cp_tmp = cp + old_len;
557 *cp_tmp = separator;
558 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
559 }
560 }
561 return cp;
562 }
564 // Scan the directory and append any jar or zip files found to path.
565 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
566 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
567 DIR* dir = os::opendir(directory);
568 if (dir == NULL) return path;
570 char dir_sep[2] = { '\0', '\0' };
571 size_t directory_len = strlen(directory);
572 const char fileSep = *os::file_separator();
573 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
575 /* Scan the directory for jars/zips, appending them to path. */
576 struct dirent *entry;
577 while ((entry = os::readdir(dir)) != NULL) {
578 const char* name = entry->d_name;
579 const char* ext = name + strlen(name) - 4;
580 bool isJarOrZip = ext > name &&
581 (os::file_name_strcmp(ext, ".jar") == 0 ||
582 os::file_name_strcmp(ext, ".zip") == 0);
583 if (isJarOrZip) {
584 size_t length = directory_len + 2 + strlen(name);
585 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
586 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
587 path = add_to_path(path, jarpath, false);
588 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
589 }
590 }
591 os::closedir(dir);
592 return path;
593 }
595 // Parses a memory size specification string.
596 static bool atomull(const char *s, julong* result) {
597 julong n = 0;
598 int args_read = sscanf(s, JULONG_FORMAT, &n);
599 if (args_read != 1) {
600 return false;
601 }
602 while (*s != '\0' && isdigit(*s)) {
603 s++;
604 }
605 // 4705540: illegal if more characters are found after the first non-digit
606 if (strlen(s) > 1) {
607 return false;
608 }
609 switch (*s) {
610 case 'T': case 't':
611 *result = n * G * K;
612 // Check for overflow.
613 if (*result/((julong)G * K) != n) return false;
614 return true;
615 case 'G': case 'g':
616 *result = n * G;
617 if (*result/G != n) return false;
618 return true;
619 case 'M': case 'm':
620 *result = n * M;
621 if (*result/M != n) return false;
622 return true;
623 case 'K': case 'k':
624 *result = n * K;
625 if (*result/K != n) return false;
626 return true;
627 case '\0':
628 *result = n;
629 return true;
630 default:
631 return false;
632 }
633 }
635 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
636 if (size < min_size) return arg_too_small;
637 // Check that size will fit in a size_t (only relevant on 32-bit)
638 if (size > max_uintx) return arg_too_big;
639 return arg_in_range;
640 }
642 // Describe an argument out of range error
643 void Arguments::describe_range_error(ArgsRange errcode) {
644 switch(errcode) {
645 case arg_too_big:
646 jio_fprintf(defaultStream::error_stream(),
647 "The specified size exceeds the maximum "
648 "representable size.\n");
649 break;
650 case arg_too_small:
651 case arg_unreadable:
652 case arg_in_range:
653 // do nothing for now
654 break;
655 default:
656 ShouldNotReachHere();
657 }
658 }
660 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
661 return CommandLineFlags::boolAtPut(name, &value, origin);
662 }
664 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
665 double v;
666 if (sscanf(value, "%lf", &v) != 1) {
667 return false;
668 }
670 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
671 return true;
672 }
673 return false;
674 }
676 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
677 julong v;
678 intx intx_v;
679 bool is_neg = false;
680 // Check the sign first since atomull() parses only unsigned values.
681 if (*value == '-') {
682 if (!CommandLineFlags::intxAt(name, &intx_v)) {
683 return false;
684 }
685 value++;
686 is_neg = true;
687 }
688 if (!atomull(value, &v)) {
689 return false;
690 }
691 intx_v = (intx) v;
692 if (is_neg) {
693 intx_v = -intx_v;
694 }
695 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
696 return true;
697 }
698 uintx uintx_v = (uintx) v;
699 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
700 return true;
701 }
702 uint64_t uint64_t_v = (uint64_t) v;
703 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
704 return true;
705 }
706 return false;
707 }
709 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
710 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
711 // Contract: CommandLineFlags always returns a pointer that needs freeing.
712 FREE_C_HEAP_ARRAY(char, value, mtInternal);
713 return true;
714 }
716 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
717 const char* old_value = "";
718 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
719 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
720 size_t new_len = strlen(new_value);
721 const char* value;
722 char* free_this_too = NULL;
723 if (old_len == 0) {
724 value = new_value;
725 } else if (new_len == 0) {
726 value = old_value;
727 } else {
728 size_t length = old_len + 1 + new_len + 1;
729 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
730 // each new setting adds another LINE to the switch:
731 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
732 value = buf;
733 free_this_too = buf;
734 }
735 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
736 // CommandLineFlags always returns a pointer that needs freeing.
737 FREE_C_HEAP_ARRAY(char, value, mtInternal);
738 if (free_this_too != NULL) {
739 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
740 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
741 }
742 return true;
743 }
745 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
747 // range of acceptable characters spelled out for portability reasons
748 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
749 #define BUFLEN 255
750 char name[BUFLEN+1];
751 char dummy;
753 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
754 return set_bool_flag(name, false, origin);
755 }
756 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
757 return set_bool_flag(name, true, origin);
758 }
760 char punct;
761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
762 const char* value = strchr(arg, '=') + 1;
763 Flag* flag = Flag::find_flag(name, strlen(name));
764 if (flag != NULL && flag->is_ccstr()) {
765 if (flag->ccstr_accumulates()) {
766 return append_to_string_flag(name, value, origin);
767 } else {
768 if (value[0] == '\0') {
769 value = NULL;
770 }
771 return set_string_flag(name, value, origin);
772 }
773 }
774 }
776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
777 const char* value = strchr(arg, '=') + 1;
778 // -XX:Foo:=xxx will reset the string flag to the given value.
779 if (value[0] == '\0') {
780 value = NULL;
781 }
782 return set_string_flag(name, value, origin);
783 }
785 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
786 #define SIGNED_NUMBER_RANGE "[-0123456789]"
787 #define NUMBER_RANGE "[0123456789]"
788 char value[BUFLEN + 1];
789 char value2[BUFLEN + 1];
790 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
791 // Looks like a floating-point number -- try again with more lenient format string
792 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
793 return set_fp_numeric_flag(name, value, origin);
794 }
795 }
797 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
798 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
799 return set_numeric_flag(name, value, origin);
800 }
802 return false;
803 }
805 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
806 assert(bldarray != NULL, "illegal argument");
808 if (arg == NULL) {
809 return;
810 }
812 int new_count = *count + 1;
814 // expand the array and add arg to the last element
815 if (*bldarray == NULL) {
816 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
817 } else {
818 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
819 }
820 (*bldarray)[*count] = strdup(arg);
821 *count = new_count;
822 }
824 void Arguments::build_jvm_args(const char* arg) {
825 add_string(&_jvm_args_array, &_num_jvm_args, arg);
826 }
828 void Arguments::build_jvm_flags(const char* arg) {
829 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
830 }
832 // utility function to return a string that concatenates all
833 // strings in a given char** array
834 const char* Arguments::build_resource_string(char** args, int count) {
835 if (args == NULL || count == 0) {
836 return NULL;
837 }
838 size_t length = 0;
839 for (int i = 0; i < count; i++) {
840 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
841 }
842 char* s = NEW_RESOURCE_ARRAY(char, length);
843 char* dst = s;
844 for (int j = 0; j < count; j++) {
845 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
846 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
847 dst += offset;
848 length -= offset;
849 }
850 return (const char*) s;
851 }
853 void Arguments::print_on(outputStream* st) {
854 st->print_cr("VM Arguments:");
855 if (num_jvm_flags() > 0) {
856 st->print("jvm_flags: "); print_jvm_flags_on(st);
857 }
858 if (num_jvm_args() > 0) {
859 st->print("jvm_args: "); print_jvm_args_on(st);
860 }
861 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
862 if (_java_class_path != NULL) {
863 char* path = _java_class_path->value();
864 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
865 }
866 st->print_cr("Launcher Type: %s", _sun_java_launcher);
867 }
869 void Arguments::print_jvm_flags_on(outputStream* st) {
870 if (_num_jvm_flags > 0) {
871 for (int i=0; i < _num_jvm_flags; i++) {
872 st->print("%s ", _jvm_flags_array[i]);
873 }
874 st->cr();
875 }
876 }
878 void Arguments::print_jvm_args_on(outputStream* st) {
879 if (_num_jvm_args > 0) {
880 for (int i=0; i < _num_jvm_args; i++) {
881 st->print("%s ", _jvm_args_array[i]);
882 }
883 st->cr();
884 }
885 }
887 bool Arguments::process_argument(const char* arg,
888 jboolean ignore_unrecognized, Flag::Flags origin) {
890 JDK_Version since = JDK_Version();
892 if (parse_argument(arg, origin) || ignore_unrecognized) {
893 return true;
894 }
896 bool has_plus_minus = (*arg == '+' || *arg == '-');
897 const char* const argname = has_plus_minus ? arg + 1 : arg;
898 if (is_newly_obsolete(arg, &since)) {
899 char version[256];
900 since.to_string(version, sizeof(version));
901 warning("ignoring option %s; support was removed in %s", argname, version);
902 return true;
903 }
905 // For locked flags, report a custom error message if available.
906 // Otherwise, report the standard unrecognized VM option.
908 size_t arg_len;
909 const char* equal_sign = strchr(argname, '=');
910 if (equal_sign == NULL) {
911 arg_len = strlen(argname);
912 } else {
913 arg_len = equal_sign - argname;
914 }
916 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
917 if (found_flag != NULL) {
918 char locked_message_buf[BUFLEN];
919 found_flag->get_locked_message(locked_message_buf, BUFLEN);
920 if (strlen(locked_message_buf) == 0) {
921 if (found_flag->is_bool() && !has_plus_minus) {
922 jio_fprintf(defaultStream::error_stream(),
923 "Missing +/- setting for VM option '%s'\n", argname);
924 } else if (!found_flag->is_bool() && has_plus_minus) {
925 jio_fprintf(defaultStream::error_stream(),
926 "Unexpected +/- setting in VM option '%s'\n", argname);
927 } else {
928 jio_fprintf(defaultStream::error_stream(),
929 "Improperly specified VM option '%s'\n", argname);
930 }
931 } else {
932 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
933 }
934 } else {
935 jio_fprintf(defaultStream::error_stream(),
936 "Unrecognized VM option '%s'\n", argname);
937 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
938 if (fuzzy_matched != NULL) {
939 jio_fprintf(defaultStream::error_stream(),
940 "Did you mean '%s%s%s'?\n",
941 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
942 fuzzy_matched->_name,
943 (fuzzy_matched->is_bool()) ? "" : "=<value>");
944 }
945 }
947 // allow for commandline "commenting out" options like -XX:#+Verbose
948 return arg[0] == '#';
949 }
951 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
952 FILE* stream = fopen(file_name, "rb");
953 if (stream == NULL) {
954 if (should_exist) {
955 jio_fprintf(defaultStream::error_stream(),
956 "Could not open settings file %s\n", file_name);
957 return false;
958 } else {
959 return true;
960 }
961 }
963 char token[1024];
964 int pos = 0;
966 bool in_white_space = true;
967 bool in_comment = false;
968 bool in_quote = false;
969 char quote_c = 0;
970 bool result = true;
972 int c = getc(stream);
973 while(c != EOF && pos < (int)(sizeof(token)-1)) {
974 if (in_white_space) {
975 if (in_comment) {
976 if (c == '\n') in_comment = false;
977 } else {
978 if (c == '#') in_comment = true;
979 else if (!isspace(c)) {
980 in_white_space = false;
981 token[pos++] = c;
982 }
983 }
984 } else {
985 if (c == '\n' || (!in_quote && isspace(c))) {
986 // token ends at newline, or at unquoted whitespace
987 // this allows a way to include spaces in string-valued options
988 token[pos] = '\0';
989 logOption(token);
990 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
991 build_jvm_flags(token);
992 pos = 0;
993 in_white_space = true;
994 in_quote = false;
995 } else if (!in_quote && (c == '\'' || c == '"')) {
996 in_quote = true;
997 quote_c = c;
998 } else if (in_quote && (c == quote_c)) {
999 in_quote = false;
1000 } else {
1001 token[pos++] = c;
1002 }
1003 }
1004 c = getc(stream);
1005 }
1006 if (pos > 0) {
1007 token[pos] = '\0';
1008 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1009 build_jvm_flags(token);
1010 }
1011 fclose(stream);
1012 return result;
1013 }
1015 //=============================================================================================================
1016 // Parsing of properties (-D)
1018 const char* Arguments::get_property(const char* key) {
1019 return PropertyList_get_value(system_properties(), key);
1020 }
1022 bool Arguments::add_property(const char* prop) {
1023 const char* eq = strchr(prop, '=');
1024 char* key;
1025 // ns must be static--its address may be stored in a SystemProperty object.
1026 const static char ns[1] = {0};
1027 char* value = (char *)ns;
1029 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1030 key = AllocateHeap(key_len + 1, mtInternal);
1031 strncpy(key, prop, key_len);
1032 key[key_len] = '\0';
1034 if (eq != NULL) {
1035 size_t value_len = strlen(prop) - key_len - 1;
1036 value = AllocateHeap(value_len + 1, mtInternal);
1037 strncpy(value, &prop[key_len + 1], value_len + 1);
1038 }
1040 if (strcmp(key, "java.compiler") == 0) {
1041 process_java_compiler_argument(value);
1042 FreeHeap(key);
1043 if (eq != NULL) {
1044 FreeHeap(value);
1045 }
1046 return true;
1047 } else if (strcmp(key, "sun.java.command") == 0) {
1048 _java_command = value;
1050 // Record value in Arguments, but let it get passed to Java.
1051 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1052 // launcher.pid property is private and is processed
1053 // in process_sun_java_launcher_properties();
1054 // the sun.java.launcher property is passed on to the java application
1055 FreeHeap(key);
1056 if (eq != NULL) {
1057 FreeHeap(value);
1058 }
1059 return true;
1060 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1061 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1062 // its value without going through the property list or making a Java call.
1063 _java_vendor_url_bug = value;
1064 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1065 PropertyList_unique_add(&_system_properties, key, value, true);
1066 return true;
1067 }
1068 // Create new property and add at the end of the list
1069 PropertyList_unique_add(&_system_properties, key, value);
1070 return true;
1071 }
1073 //===========================================================================================================
1074 // Setting int/mixed/comp mode flags
1076 void Arguments::set_mode_flags(Mode mode) {
1077 // Set up default values for all flags.
1078 // If you add a flag to any of the branches below,
1079 // add a default value for it here.
1080 set_java_compiler(false);
1081 _mode = mode;
1083 // Ensure Agent_OnLoad has the correct initial values.
1084 // This may not be the final mode; mode may change later in onload phase.
1085 PropertyList_unique_add(&_system_properties, "java.vm.info",
1086 (char*)VM_Version::vm_info_string(), false);
1088 UseInterpreter = true;
1089 UseCompiler = true;
1090 UseLoopCounter = true;
1092 #ifndef ZERO
1093 // Turn these off for mixed and comp. Leave them on for Zero.
1094 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1095 UseFastAccessorMethods = (mode == _int);
1096 }
1097 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1098 UseFastEmptyMethods = (mode == _int);
1099 }
1100 #endif
1102 // Default values may be platform/compiler dependent -
1103 // use the saved values
1104 ClipInlining = Arguments::_ClipInlining;
1105 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1106 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1107 BackgroundCompilation = Arguments::_BackgroundCompilation;
1109 // Change from defaults based on mode
1110 switch (mode) {
1111 default:
1112 ShouldNotReachHere();
1113 break;
1114 case _int:
1115 UseCompiler = false;
1116 UseLoopCounter = false;
1117 AlwaysCompileLoopMethods = false;
1118 UseOnStackReplacement = false;
1119 break;
1120 case _mixed:
1121 // same as default
1122 break;
1123 case _comp:
1124 UseInterpreter = false;
1125 BackgroundCompilation = false;
1126 ClipInlining = false;
1127 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1128 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1129 // compile a level 4 (C2) and then continue executing it.
1130 if (TieredCompilation) {
1131 Tier3InvokeNotifyFreqLog = 0;
1132 Tier4InvocationThreshold = 0;
1133 }
1134 break;
1135 }
1136 }
1138 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1139 // Conflict: required to use shared spaces (-Xshare:on), but
1140 // incompatible command line options were chosen.
1142 static void no_shared_spaces(const char* message) {
1143 if (RequireSharedSpaces) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Class data sharing is inconsistent with other specified options.\n");
1146 vm_exit_during_initialization("Unable to use shared archive.", message);
1147 } else {
1148 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1149 }
1150 }
1151 #endif
1153 void Arguments::set_tiered_flags() {
1154 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1155 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1156 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1157 }
1158 if (CompilationPolicyChoice < 2) {
1159 vm_exit_during_initialization(
1160 "Incompatible compilation policy selected", NULL);
1161 }
1162 // Increase the code cache size - tiered compiles a lot more.
1163 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1164 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1165 }
1166 if (!UseInterpreter) { // -Xcomp
1167 Tier3InvokeNotifyFreqLog = 0;
1168 Tier4InvocationThreshold = 0;
1169 }
1170 }
1172 /**
1173 * Returns the minimum number of compiler threads needed to run the JVM. The following
1174 * configurations are possible.
1175 *
1176 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1177 * compiler threads is 0.
1178 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1179 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1180 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1181 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1182 * C1 can be used, so the minimum number of compiler threads is 1.
1183 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1184 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1185 * the minimum number of compiler threads is 2.
1186 */
1187 int Arguments::get_min_number_of_compiler_threads() {
1188 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1189 return 0; // case 1
1190 #else
1191 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1192 return 1; // case 2 or case 3
1193 }
1194 return 2; // case 4 (tiered)
1195 #endif
1196 }
1198 #if INCLUDE_ALL_GCS
1199 static void disable_adaptive_size_policy(const char* collector_name) {
1200 if (UseAdaptiveSizePolicy) {
1201 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1202 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1203 collector_name);
1204 }
1205 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1206 }
1207 }
1209 void Arguments::set_parnew_gc_flags() {
1210 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1211 "control point invariant");
1212 assert(UseParNewGC, "Error");
1214 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1215 disable_adaptive_size_policy("UseParNewGC");
1217 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1218 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1219 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1220 } else if (ParallelGCThreads == 0) {
1221 jio_fprintf(defaultStream::error_stream(),
1222 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1223 vm_exit(1);
1224 }
1226 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1227 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1228 // we set them to 1024 and 1024.
1229 // See CR 6362902.
1230 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1231 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1232 }
1233 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1234 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1235 }
1237 // AlwaysTenure flag should make ParNew promote all at first collection.
1238 // See CR 6362902.
1239 if (AlwaysTenure) {
1240 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1241 }
1242 // When using compressed oops, we use local overflow stacks,
1243 // rather than using a global overflow list chained through
1244 // the klass word of the object's pre-image.
1245 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1246 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1247 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1248 }
1249 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1250 }
1251 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1252 }
1254 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1255 // sparc/solaris for certain applications, but would gain from
1256 // further optimization and tuning efforts, and would almost
1257 // certainly gain from analysis of platform and environment.
1258 void Arguments::set_cms_and_parnew_gc_flags() {
1259 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1260 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1262 // If we are using CMS, we prefer to UseParNewGC,
1263 // unless explicitly forbidden.
1264 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1265 FLAG_SET_ERGO(bool, UseParNewGC, true);
1266 }
1268 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1269 disable_adaptive_size_policy("UseConcMarkSweepGC");
1271 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1272 // as needed.
1273 if (UseParNewGC) {
1274 set_parnew_gc_flags();
1275 }
1277 size_t max_heap = align_size_down(MaxHeapSize,
1278 CardTableRS::ct_max_alignment_constraint());
1280 // Now make adjustments for CMS
1281 intx tenuring_default = (intx)6;
1282 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1284 // Preferred young gen size for "short" pauses:
1285 // upper bound depends on # of threads and NewRatio.
1286 const uintx parallel_gc_threads =
1287 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1288 const size_t preferred_max_new_size_unaligned =
1289 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1290 size_t preferred_max_new_size =
1291 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1293 // Unless explicitly requested otherwise, size young gen
1294 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1296 // If either MaxNewSize or NewRatio is set on the command line,
1297 // assume the user is trying to set the size of the young gen.
1298 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1300 // Set MaxNewSize to our calculated preferred_max_new_size unless
1301 // NewSize was set on the command line and it is larger than
1302 // preferred_max_new_size.
1303 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1304 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1305 } else {
1306 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1307 }
1308 if (PrintGCDetails && Verbose) {
1309 // Too early to use gclog_or_tty
1310 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1311 }
1313 // Code along this path potentially sets NewSize and OldSize
1314 if (PrintGCDetails && Verbose) {
1315 // Too early to use gclog_or_tty
1316 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1317 " initial_heap_size: " SIZE_FORMAT
1318 " max_heap: " SIZE_FORMAT,
1319 min_heap_size(), InitialHeapSize, max_heap);
1320 }
1321 size_t min_new = preferred_max_new_size;
1322 if (FLAG_IS_CMDLINE(NewSize)) {
1323 min_new = NewSize;
1324 }
1325 if (max_heap > min_new && min_heap_size() > min_new) {
1326 // Unless explicitly requested otherwise, make young gen
1327 // at least min_new, and at most preferred_max_new_size.
1328 if (FLAG_IS_DEFAULT(NewSize)) {
1329 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1330 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1331 if (PrintGCDetails && Verbose) {
1332 // Too early to use gclog_or_tty
1333 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1334 }
1335 }
1336 // Unless explicitly requested otherwise, size old gen
1337 // so it's NewRatio x of NewSize.
1338 if (FLAG_IS_DEFAULT(OldSize)) {
1339 if (max_heap > NewSize) {
1340 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1341 if (PrintGCDetails && Verbose) {
1342 // Too early to use gclog_or_tty
1343 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1344 }
1345 }
1346 }
1347 }
1348 }
1349 // Unless explicitly requested otherwise, definitely
1350 // promote all objects surviving "tenuring_default" scavenges.
1351 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1352 FLAG_IS_DEFAULT(SurvivorRatio)) {
1353 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1354 }
1355 // If we decided above (or user explicitly requested)
1356 // `promote all' (via MaxTenuringThreshold := 0),
1357 // prefer minuscule survivor spaces so as not to waste
1358 // space for (non-existent) survivors
1359 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1360 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1361 }
1362 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1363 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1364 // This is done in order to make ParNew+CMS configuration to work
1365 // with YoungPLABSize and OldPLABSize options.
1366 // See CR 6362902.
1367 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1368 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1369 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1370 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1371 // the value (either from the command line or ergonomics) of
1372 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1373 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1374 } else {
1375 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1376 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1377 // we'll let it to take precedence.
1378 jio_fprintf(defaultStream::error_stream(),
1379 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1380 " options are specified for the CMS collector."
1381 " CMSParPromoteBlocksToClaim will take precedence.\n");
1382 }
1383 }
1384 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1385 // OldPLAB sizing manually turned off: Use a larger default setting,
1386 // unless it was manually specified. This is because a too-low value
1387 // will slow down scavenges.
1388 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1389 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1390 }
1391 }
1392 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1393 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1394 // If either of the static initialization defaults have changed, note this
1395 // modification.
1396 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1397 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1398 }
1400 if (PrintGCDetails && Verbose) {
1401 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1402 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1403 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1404 }
1405 }
1406 #endif // INCLUDE_ALL_GCS
1408 void set_object_alignment() {
1409 // Object alignment.
1410 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1411 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1412 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1413 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1414 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1415 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1417 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1418 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1420 // Oop encoding heap max
1421 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1423 #if INCLUDE_ALL_GCS
1424 // Set CMS global values
1425 CompactibleFreeListSpace::set_cms_values();
1426 #endif // INCLUDE_ALL_GCS
1427 }
1429 bool verify_object_alignment() {
1430 // Object alignment.
1431 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1432 jio_fprintf(defaultStream::error_stream(),
1433 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1434 (int)ObjectAlignmentInBytes);
1435 return false;
1436 }
1437 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1438 jio_fprintf(defaultStream::error_stream(),
1439 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1440 (int)ObjectAlignmentInBytes, BytesPerLong);
1441 return false;
1442 }
1443 // It does not make sense to have big object alignment
1444 // since a space lost due to alignment will be greater
1445 // then a saved space from compressed oops.
1446 if ((int)ObjectAlignmentInBytes > 256) {
1447 jio_fprintf(defaultStream::error_stream(),
1448 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1449 (int)ObjectAlignmentInBytes);
1450 return false;
1451 }
1452 // In case page size is very small.
1453 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1454 jio_fprintf(defaultStream::error_stream(),
1455 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1456 (int)ObjectAlignmentInBytes, os::vm_page_size());
1457 return false;
1458 }
1459 if(SurvivorAlignmentInBytes == 0) {
1460 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1461 } else {
1462 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1463 jio_fprintf(defaultStream::error_stream(),
1464 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1465 (int)SurvivorAlignmentInBytes);
1466 return false;
1467 }
1468 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1469 jio_fprintf(defaultStream::error_stream(),
1470 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1471 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1472 return false;
1473 }
1474 }
1475 return true;
1476 }
1478 size_t Arguments::max_heap_for_compressed_oops() {
1479 // Avoid sign flip.
1480 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1481 // We need to fit both the NULL page and the heap into the memory budget, while
1482 // keeping alignment constraints of the heap. To guarantee the latter, as the
1483 // NULL page is located before the heap, we pad the NULL page to the conservative
1484 // maximum alignment that the GC may ever impose upon the heap.
1485 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1486 _conservative_max_heap_alignment);
1488 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1489 NOT_LP64(ShouldNotReachHere(); return 0);
1490 }
1492 bool Arguments::should_auto_select_low_pause_collector() {
1493 if (UseAutoGCSelectPolicy &&
1494 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1495 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1496 if (PrintGCDetails) {
1497 // Cannot use gclog_or_tty yet.
1498 tty->print_cr("Automatic selection of the low pause collector"
1499 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1500 }
1501 return true;
1502 }
1503 return false;
1504 }
1506 void Arguments::set_use_compressed_oops() {
1507 #ifndef ZERO
1508 #ifdef _LP64
1509 // MaxHeapSize is not set up properly at this point, but
1510 // the only value that can override MaxHeapSize if we are
1511 // to use UseCompressedOops is InitialHeapSize.
1512 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1514 if (max_heap_size <= max_heap_for_compressed_oops()) {
1515 #if !defined(COMPILER1) || defined(TIERED)
1516 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1517 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1518 }
1519 #endif
1520 #ifdef _WIN64
1521 if (UseLargePages && UseCompressedOops) {
1522 // Cannot allocate guard pages for implicit checks in indexed addressing
1523 // mode, when large pages are specified on windows.
1524 // This flag could be switched ON if narrow oop base address is set to 0,
1525 // see code in Universe::initialize_heap().
1526 Universe::set_narrow_oop_use_implicit_null_checks(false);
1527 }
1528 #endif // _WIN64
1529 } else {
1530 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1531 warning("Max heap size too large for Compressed Oops");
1532 FLAG_SET_DEFAULT(UseCompressedOops, false);
1533 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1534 }
1535 }
1536 #endif // _LP64
1537 #endif // ZERO
1538 }
1541 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1542 // set_use_compressed_oops().
1543 void Arguments::set_use_compressed_klass_ptrs() {
1544 #ifndef ZERO
1545 #ifdef _LP64
1546 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1547 if (!UseCompressedOops) {
1548 if (UseCompressedClassPointers) {
1549 warning("UseCompressedClassPointers requires UseCompressedOops");
1550 }
1551 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1552 } else {
1553 // Turn on UseCompressedClassPointers too
1554 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1555 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1556 }
1557 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1558 if (UseCompressedClassPointers) {
1559 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1560 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1561 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1562 }
1563 }
1564 }
1565 #endif // _LP64
1566 #endif // !ZERO
1567 }
1569 void Arguments::set_conservative_max_heap_alignment() {
1570 // The conservative maximum required alignment for the heap is the maximum of
1571 // the alignments imposed by several sources: any requirements from the heap
1572 // itself, the collector policy and the maximum page size we may run the VM
1573 // with.
1574 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1575 #if INCLUDE_ALL_GCS
1576 if (UseParallelGC) {
1577 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1578 } else if (UseG1GC) {
1579 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1580 }
1581 #endif // INCLUDE_ALL_GCS
1582 _conservative_max_heap_alignment = MAX4(heap_alignment,
1583 (size_t)os::vm_allocation_granularity(),
1584 os::max_page_size(),
1585 CollectorPolicy::compute_heap_alignment());
1586 }
1588 void Arguments::select_gc_ergonomically() {
1589 if (os::is_server_class_machine()) {
1590 if (should_auto_select_low_pause_collector()) {
1591 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1592 } else {
1593 FLAG_SET_ERGO(bool, UseParallelGC, true);
1594 }
1595 }
1596 }
1598 void Arguments::select_gc() {
1599 if (!gc_selected()) {
1600 select_gc_ergonomically();
1601 }
1602 }
1604 void Arguments::set_ergonomics_flags() {
1605 select_gc();
1607 #ifdef COMPILER2
1608 // Shared spaces work fine with other GCs but causes bytecode rewriting
1609 // to be disabled, which hurts interpreter performance and decreases
1610 // server performance. When -server is specified, keep the default off
1611 // unless it is asked for. Future work: either add bytecode rewriting
1612 // at link time, or rewrite bytecodes in non-shared methods.
1613 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1614 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1615 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1616 }
1617 #endif
1619 set_conservative_max_heap_alignment();
1621 #ifndef ZERO
1622 #ifdef _LP64
1623 set_use_compressed_oops();
1625 // set_use_compressed_klass_ptrs() must be called after calling
1626 // set_use_compressed_oops().
1627 set_use_compressed_klass_ptrs();
1629 // Also checks that certain machines are slower with compressed oops
1630 // in vm_version initialization code.
1631 #endif // _LP64
1632 #endif // !ZERO
1633 }
1635 void Arguments::set_parallel_gc_flags() {
1636 assert(UseParallelGC || UseParallelOldGC, "Error");
1637 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1638 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1639 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1640 }
1641 FLAG_SET_DEFAULT(UseParallelGC, true);
1643 // If no heap maximum was requested explicitly, use some reasonable fraction
1644 // of the physical memory, up to a maximum of 1GB.
1645 FLAG_SET_DEFAULT(ParallelGCThreads,
1646 Abstract_VM_Version::parallel_worker_threads());
1647 if (ParallelGCThreads == 0) {
1648 jio_fprintf(defaultStream::error_stream(),
1649 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1650 vm_exit(1);
1651 }
1653 if (UseAdaptiveSizePolicy) {
1654 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1655 // unless the user actually sets these flags.
1656 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1657 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1658 _min_heap_free_ratio = MinHeapFreeRatio;
1659 }
1660 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1661 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1662 _max_heap_free_ratio = MaxHeapFreeRatio;
1663 }
1664 }
1666 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1667 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1668 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1669 // See CR 6362902 for details.
1670 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1671 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1672 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1673 }
1674 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1675 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1676 }
1677 }
1679 if (UseParallelOldGC) {
1680 // Par compact uses lower default values since they are treated as
1681 // minimums. These are different defaults because of the different
1682 // interpretation and are not ergonomically set.
1683 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1684 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1685 }
1686 }
1687 }
1689 void Arguments::set_g1_gc_flags() {
1690 assert(UseG1GC, "Error");
1691 #ifdef COMPILER1
1692 FastTLABRefill = false;
1693 #endif
1694 FLAG_SET_DEFAULT(ParallelGCThreads,
1695 Abstract_VM_Version::parallel_worker_threads());
1696 if (ParallelGCThreads == 0) {
1697 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1698 }
1700 #if INCLUDE_ALL_GCS
1701 if (G1ConcRefinementThreads == 0) {
1702 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1703 }
1704 #endif
1706 // MarkStackSize will be set (if it hasn't been set by the user)
1707 // when concurrent marking is initialized.
1708 // Its value will be based upon the number of parallel marking threads.
1709 // But we do set the maximum mark stack size here.
1710 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1711 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1712 }
1714 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1715 // In G1, we want the default GC overhead goal to be higher than
1716 // say in PS. So we set it here to 10%. Otherwise the heap might
1717 // be expanded more aggressively than we would like it to. In
1718 // fact, even 10% seems to not be high enough in some cases
1719 // (especially small GC stress tests that the main thing they do
1720 // is allocation). We might consider increase it further.
1721 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1722 }
1724 if (PrintGCDetails && Verbose) {
1725 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1726 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1727 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1728 }
1729 }
1731 #if !INCLUDE_ALL_GCS
1732 #ifdef ASSERT
1733 static bool verify_serial_gc_flags() {
1734 return (UseSerialGC &&
1735 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1736 UseParallelGC || UseParallelOldGC));
1737 }
1738 #endif // ASSERT
1739 #endif // INCLUDE_ALL_GCS
1741 void Arguments::set_gc_specific_flags() {
1742 #if INCLUDE_ALL_GCS
1743 // Set per-collector flags
1744 if (UseParallelGC || UseParallelOldGC) {
1745 set_parallel_gc_flags();
1746 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1747 set_cms_and_parnew_gc_flags();
1748 } else if (UseParNewGC) { // Skipped if CMS is set above
1749 set_parnew_gc_flags();
1750 } else if (UseG1GC) {
1751 set_g1_gc_flags();
1752 }
1753 check_deprecated_gcs();
1754 check_deprecated_gc_flags();
1755 if (AssumeMP && !UseSerialGC) {
1756 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1757 warning("If the number of processors is expected to increase from one, then"
1758 " you should configure the number of parallel GC threads appropriately"
1759 " using -XX:ParallelGCThreads=N");
1760 }
1761 }
1762 if (MinHeapFreeRatio == 100) {
1763 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1764 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1765 }
1767 // If class unloading is disabled, also disable concurrent class unloading.
1768 if (!ClassUnloading) {
1769 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1770 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1771 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1772 }
1773 #else // INCLUDE_ALL_GCS
1774 assert(verify_serial_gc_flags(), "SerialGC unset");
1775 #endif // INCLUDE_ALL_GCS
1776 }
1778 julong Arguments::limit_by_allocatable_memory(julong limit) {
1779 julong max_allocatable;
1780 julong result = limit;
1781 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1782 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1783 }
1784 return result;
1785 }
1787 void Arguments::set_heap_size() {
1788 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1789 // Deprecated flag
1790 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1791 }
1793 julong phys_mem =
1794 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1795 : (julong)MaxRAM;
1797 // Experimental support for CGroup memory limits
1798 if (UseCGroupMemoryLimitForHeap) {
1799 // This is a rough indicator that a CGroup limit may be in force
1800 // for this process
1801 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1802 FILE *fp = fopen(lim_file, "r");
1803 if (fp != NULL) {
1804 julong cgroup_max = 0;
1805 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1806 if (ret == 1 && cgroup_max > 0) {
1807 // If unlimited, cgroup_max will be a very large, but unspecified
1808 // value, so use initial phys_mem as a limit
1809 if (PrintGCDetails && Verbose) {
1810 // Cannot use gclog_or_tty yet.
1811 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1812 JULONG_FORMAT "MB) and initial phys_mem ("
1813 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1814 }
1815 phys_mem = MIN2(cgroup_max, phys_mem);
1816 } else {
1817 warning("Unable to read/parse cgroup memory limit from %s: %s",
1818 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1819 }
1820 fclose(fp);
1821 } else {
1822 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1823 }
1824 }
1826 // Convert Fraction to Precentage values
1827 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1828 !FLAG_IS_DEFAULT(MaxRAMFraction))
1829 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1831 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1832 !FLAG_IS_DEFAULT(MinRAMFraction))
1833 MinRAMPercentage = 100.0 / MinRAMFraction;
1835 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1836 !FLAG_IS_DEFAULT(InitialRAMFraction))
1837 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1839 // If the maximum heap size has not been set with -Xmx,
1840 // then set it as fraction of the size of physical memory,
1841 // respecting the maximum and minimum sizes of the heap.
1842 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1843 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1844 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1845 if (reasonable_min < MaxHeapSize) {
1846 // Small physical memory, so use a minimum fraction of it for the heap
1847 reasonable_max = reasonable_min;
1848 } else {
1849 // Not-small physical memory, so require a heap at least
1850 // as large as MaxHeapSize
1851 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1852 }
1854 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1855 // Limit the heap size to ErgoHeapSizeLimit
1856 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1857 }
1858 if (UseCompressedOops) {
1859 // Limit the heap size to the maximum possible when using compressed oops
1860 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1861 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1862 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1863 // but it should be not less than default MaxHeapSize.
1864 max_coop_heap -= HeapBaseMinAddress;
1865 }
1866 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1867 }
1868 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1870 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1871 // An initial heap size was specified on the command line,
1872 // so be sure that the maximum size is consistent. Done
1873 // after call to limit_by_allocatable_memory because that
1874 // method might reduce the allocation size.
1875 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1876 }
1878 if (PrintGCDetails && Verbose) {
1879 // Cannot use gclog_or_tty yet.
1880 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1881 }
1882 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1883 }
1885 // If the minimum or initial heap_size have not been set or requested to be set
1886 // ergonomically, set them accordingly.
1887 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1888 julong reasonable_minimum = (julong)(OldSize + NewSize);
1890 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1892 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1894 if (InitialHeapSize == 0) {
1895 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1897 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1898 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1900 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1902 if (PrintGCDetails && Verbose) {
1903 // Cannot use gclog_or_tty yet.
1904 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1905 }
1906 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1907 }
1908 // If the minimum heap size has not been set (via -Xms),
1909 // synchronize with InitialHeapSize to avoid errors with the default value.
1910 if (min_heap_size() == 0) {
1911 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1912 if (PrintGCDetails && Verbose) {
1913 // Cannot use gclog_or_tty yet.
1914 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1915 }
1916 }
1917 }
1918 }
1920 // This option inspects the machine and attempts to set various
1921 // parameters to be optimal for long-running, memory allocation
1922 // intensive jobs. It is intended for machines with large
1923 // amounts of cpu and memory.
1924 jint Arguments::set_aggressive_heap_flags() {
1925 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1926 // VM, but we may not be able to represent the total physical memory
1927 // available (like having 8gb of memory on a box but using a 32bit VM).
1928 // Thus, we need to make sure we're using a julong for intermediate
1929 // calculations.
1930 julong initHeapSize;
1931 julong total_memory = os::physical_memory();
1933 if (total_memory < (julong) 256 * M) {
1934 jio_fprintf(defaultStream::error_stream(),
1935 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1936 vm_exit(1);
1937 }
1939 // The heap size is half of available memory, or (at most)
1940 // all of possible memory less 160mb (leaving room for the OS
1941 // when using ISM). This is the maximum; because adaptive sizing
1942 // is turned on below, the actual space used may be smaller.
1944 initHeapSize = MIN2(total_memory / (julong) 2,
1945 total_memory - (julong) 160 * M);
1947 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1949 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1950 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
1951 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
1952 // Currently the minimum size and the initial heap sizes are the same.
1953 set_min_heap_size(initHeapSize);
1954 }
1955 if (FLAG_IS_DEFAULT(NewSize)) {
1956 // Make the young generation 3/8ths of the total heap.
1957 FLAG_SET_CMDLINE(uintx, NewSize,
1958 ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
1959 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
1960 }
1962 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
1963 FLAG_SET_DEFAULT(UseLargePages, true);
1964 #endif
1966 // Increase some data structure sizes for efficiency
1967 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
1968 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
1969 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
1971 // See the OldPLABSize comment below, but replace 'after promotion'
1972 // with 'after copying'. YoungPLABSize is the size of the survivor
1973 // space per-gc-thread buffers. The default is 4kw.
1974 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words
1976 // OldPLABSize is the size of the buffers in the old gen that
1977 // UseParallelGC uses to promote live data that doesn't fit in the
1978 // survivor spaces. At any given time, there's one for each gc thread.
1979 // The default size is 1kw. These buffers are rarely used, since the
1980 // survivor spaces are usually big enough. For specjbb, however, there
1981 // are occasions when there's lots of live data in the young gen
1982 // and we end up promoting some of it. We don't have a definite
1983 // explanation for why bumping OldPLABSize helps, but the theory
1984 // is that a bigger PLAB results in retaining something like the
1985 // original allocation order after promotion, which improves mutator
1986 // locality. A minor effect may be that larger PLABs reduce the
1987 // number of PLAB allocation events during gc. The value of 8kw
1988 // was arrived at by experimenting with specjbb.
1989 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words
1991 // Enable parallel GC and adaptive generation sizing
1992 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
1994 // Encourage steady state memory management
1995 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
1997 // This appears to improve mutator locality
1998 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2000 // Get around early Solaris scheduling bug
2001 // (affinity vs other jobs on system)
2002 // but disallow DR and offlining (5008695).
2003 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2005 return JNI_OK;
2006 }
2008 // This must be called after ergonomics because we want bytecode rewriting
2009 // if the server compiler is used, or if UseSharedSpaces is disabled.
2010 void Arguments::set_bytecode_flags() {
2011 // Better not attempt to store into a read-only space.
2012 if (UseSharedSpaces) {
2013 FLAG_SET_DEFAULT(RewriteBytecodes, false);
2014 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2015 }
2017 if (!RewriteBytecodes) {
2018 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2019 }
2020 }
2022 // Aggressive optimization flags -XX:+AggressiveOpts
2023 void Arguments::set_aggressive_opts_flags() {
2024 #ifdef COMPILER2
2025 if (AggressiveUnboxing) {
2026 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2027 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2028 } else if (!EliminateAutoBox) {
2029 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2030 AggressiveUnboxing = false;
2031 }
2032 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2033 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2034 } else if (!DoEscapeAnalysis) {
2035 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2036 AggressiveUnboxing = false;
2037 }
2038 }
2039 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2040 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2041 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2042 }
2043 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2044 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2045 }
2047 // Feed the cache size setting into the JDK
2048 char buffer[1024];
2049 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2050 add_property(buffer);
2051 }
2052 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2053 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2054 }
2055 #endif
2057 if (AggressiveOpts) {
2058 // Sample flag setting code
2059 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2060 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2061 // }
2062 }
2063 }
2065 //===========================================================================================================
2066 // Parsing of java.compiler property
2068 void Arguments::process_java_compiler_argument(char* arg) {
2069 // For backwards compatibility, Djava.compiler=NONE or ""
2070 // causes us to switch to -Xint mode UNLESS -Xdebug
2071 // is also specified.
2072 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2073 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2074 }
2075 }
2077 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2078 _sun_java_launcher = strdup(launcher);
2079 if (strcmp("gamma", _sun_java_launcher) == 0) {
2080 _created_by_gamma_launcher = true;
2081 }
2082 }
2084 bool Arguments::created_by_java_launcher() {
2085 assert(_sun_java_launcher != NULL, "property must have value");
2086 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2087 }
2089 bool Arguments::created_by_gamma_launcher() {
2090 return _created_by_gamma_launcher;
2091 }
2093 //===========================================================================================================
2094 // Parsing of main arguments
2096 bool Arguments::verify_interval(uintx val, uintx min,
2097 uintx max, const char* name) {
2098 // Returns true iff value is in the inclusive interval [min..max]
2099 // false, otherwise.
2100 if (val >= min && val <= max) {
2101 return true;
2102 }
2103 jio_fprintf(defaultStream::error_stream(),
2104 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2105 " and " UINTX_FORMAT "\n",
2106 name, val, min, max);
2107 return false;
2108 }
2110 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2111 // Returns true if given value is at least specified min threshold
2112 // false, otherwise.
2113 if (val >= min ) {
2114 return true;
2115 }
2116 jio_fprintf(defaultStream::error_stream(),
2117 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2118 name, val, min);
2119 return false;
2120 }
2122 bool Arguments::verify_percentage(uintx value, const char* name) {
2123 if (is_percentage(value)) {
2124 return true;
2125 }
2126 jio_fprintf(defaultStream::error_stream(),
2127 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2128 name, value);
2129 return false;
2130 }
2132 // check if do gclog rotation
2133 // +UseGCLogFileRotation is a must,
2134 // no gc log rotation when log file not supplied or
2135 // NumberOfGCLogFiles is 0
2136 void check_gclog_consistency() {
2137 if (UseGCLogFileRotation) {
2138 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2139 jio_fprintf(defaultStream::output_stream(),
2140 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2141 "where num_of_file > 0\n"
2142 "GC log rotation is turned off\n");
2143 UseGCLogFileRotation = false;
2144 }
2145 }
2147 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2148 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2149 jio_fprintf(defaultStream::output_stream(),
2150 "GCLogFileSize changed to minimum 8K\n");
2151 }
2152 }
2154 // This function is called for -Xloggc:<filename>, it can be used
2155 // to check if a given file name(or string) conforms to the following
2156 // specification:
2157 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2158 // %p and %t only allowed once. We only limit usage of filename not path
2159 bool is_filename_valid(const char *file_name) {
2160 const char* p = file_name;
2161 char file_sep = os::file_separator()[0];
2162 const char* cp;
2163 // skip prefix path
2164 for (cp = file_name; *cp != '\0'; cp++) {
2165 if (*cp == '/' || *cp == file_sep) {
2166 p = cp + 1;
2167 }
2168 }
2170 int count_p = 0;
2171 int count_t = 0;
2172 while (*p != '\0') {
2173 if ((*p >= '0' && *p <= '9') ||
2174 (*p >= 'A' && *p <= 'Z') ||
2175 (*p >= 'a' && *p <= 'z') ||
2176 *p == '-' ||
2177 *p == '_' ||
2178 *p == '.') {
2179 p++;
2180 continue;
2181 }
2182 if (*p == '%') {
2183 if(*(p + 1) == 'p') {
2184 p += 2;
2185 count_p ++;
2186 continue;
2187 }
2188 if (*(p + 1) == 't') {
2189 p += 2;
2190 count_t ++;
2191 continue;
2192 }
2193 }
2194 return false;
2195 }
2196 return count_p < 2 && count_t < 2;
2197 }
2199 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2200 if (!is_percentage(min_heap_free_ratio)) {
2201 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2202 return false;
2203 }
2204 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2205 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2206 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2207 MaxHeapFreeRatio);
2208 return false;
2209 }
2210 // This does not set the flag itself, but stores the value in a safe place for later usage.
2211 _min_heap_free_ratio = min_heap_free_ratio;
2212 return true;
2213 }
2215 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2216 if (!is_percentage(max_heap_free_ratio)) {
2217 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2218 return false;
2219 }
2220 if (max_heap_free_ratio < MinHeapFreeRatio) {
2221 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2222 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2223 MinHeapFreeRatio);
2224 return false;
2225 }
2226 // This does not set the flag itself, but stores the value in a safe place for later usage.
2227 _max_heap_free_ratio = max_heap_free_ratio;
2228 return true;
2229 }
2231 // Check consistency of GC selection
2232 bool Arguments::check_gc_consistency() {
2233 check_gclog_consistency();
2234 bool status = true;
2235 // Ensure that the user has not selected conflicting sets
2236 // of collectors. [Note: this check is merely a user convenience;
2237 // collectors over-ride each other so that only a non-conflicting
2238 // set is selected; however what the user gets is not what they
2239 // may have expected from the combination they asked for. It's
2240 // better to reduce user confusion by not allowing them to
2241 // select conflicting combinations.
2242 uint i = 0;
2243 if (UseSerialGC) i++;
2244 if (UseConcMarkSweepGC || UseParNewGC) i++;
2245 if (UseParallelGC || UseParallelOldGC) i++;
2246 if (UseG1GC) i++;
2247 if (i > 1) {
2248 jio_fprintf(defaultStream::error_stream(),
2249 "Conflicting collector combinations in option list; "
2250 "please refer to the release notes for the combinations "
2251 "allowed\n");
2252 status = false;
2253 }
2254 return status;
2255 }
2257 void Arguments::check_deprecated_gcs() {
2258 if (UseConcMarkSweepGC && !UseParNewGC) {
2259 warning("Using the DefNew young collector with the CMS collector is deprecated "
2260 "and will likely be removed in a future release");
2261 }
2263 if (UseParNewGC && !UseConcMarkSweepGC) {
2264 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2265 // set up UseSerialGC properly, so that can't be used in the check here.
2266 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2267 "and will likely be removed in a future release");
2268 }
2270 if (CMSIncrementalMode) {
2271 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2272 }
2273 }
2275 void Arguments::check_deprecated_gc_flags() {
2276 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2277 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2278 "and will likely be removed in future release");
2279 }
2280 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2281 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2282 "Use MaxRAMFraction instead.");
2283 }
2284 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2285 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2286 }
2287 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2288 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2289 }
2290 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2291 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2292 }
2293 }
2295 // Check stack pages settings
2296 bool Arguments::check_stack_pages()
2297 {
2298 bool status = true;
2299 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2300 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2301 // greater stack shadow pages can't generate instruction to bang stack
2302 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2303 return status;
2304 }
2306 // Check the consistency of vm_init_args
2307 bool Arguments::check_vm_args_consistency() {
2308 // Method for adding checks for flag consistency.
2309 // The intent is to warn the user of all possible conflicts,
2310 // before returning an error.
2311 // Note: Needs platform-dependent factoring.
2312 bool status = true;
2314 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2315 // builds so the cost of stack banging can be measured.
2316 #if (defined(PRODUCT) && defined(SOLARIS))
2317 if (!UseBoundThreads && !UseStackBanging) {
2318 jio_fprintf(defaultStream::error_stream(),
2319 "-UseStackBanging conflicts with -UseBoundThreads\n");
2321 status = false;
2322 }
2323 #endif
2325 if (TLABRefillWasteFraction == 0) {
2326 jio_fprintf(defaultStream::error_stream(),
2327 "TLABRefillWasteFraction should be a denominator, "
2328 "not " SIZE_FORMAT "\n",
2329 TLABRefillWasteFraction);
2330 status = false;
2331 }
2333 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2334 "AdaptiveSizePolicyWeight");
2335 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2337 // Divide by bucket size to prevent a large size from causing rollover when
2338 // calculating amount of memory needed to be allocated for the String table.
2339 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2340 (max_uintx / StringTable::bucket_size()), "StringTable size");
2342 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2343 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2345 {
2346 // Using "else if" below to avoid printing two error messages if min > max.
2347 // This will also prevent us from reporting both min>100 and max>100 at the
2348 // same time, but that is less annoying than printing two identical errors IMHO.
2349 FormatBuffer<80> err_msg("%s","");
2350 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2351 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2352 status = false;
2353 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2354 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2355 status = false;
2356 }
2357 }
2359 // Min/MaxMetaspaceFreeRatio
2360 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2361 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2363 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2364 jio_fprintf(defaultStream::error_stream(),
2365 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2366 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2367 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2368 MinMetaspaceFreeRatio,
2369 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2370 MaxMetaspaceFreeRatio);
2371 status = false;
2372 }
2374 // Trying to keep 100% free is not practical
2375 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2377 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2378 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2379 }
2381 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2382 // Settings to encourage splitting.
2383 if (!FLAG_IS_CMDLINE(NewRatio)) {
2384 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2385 }
2386 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2387 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2388 }
2389 }
2391 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2392 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2393 if (GCTimeLimit == 100) {
2394 // Turn off gc-overhead-limit-exceeded checks
2395 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2396 }
2398 status = status && check_gc_consistency();
2399 status = status && check_stack_pages();
2401 if (CMSIncrementalMode) {
2402 if (!UseConcMarkSweepGC) {
2403 jio_fprintf(defaultStream::error_stream(),
2404 "error: invalid argument combination.\n"
2405 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2406 "selected in order\nto use CMSIncrementalMode.\n");
2407 status = false;
2408 } else {
2409 status = status && verify_percentage(CMSIncrementalDutyCycle,
2410 "CMSIncrementalDutyCycle");
2411 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2412 "CMSIncrementalDutyCycleMin");
2413 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2414 "CMSIncrementalSafetyFactor");
2415 status = status && verify_percentage(CMSIncrementalOffset,
2416 "CMSIncrementalOffset");
2417 status = status && verify_percentage(CMSExpAvgFactor,
2418 "CMSExpAvgFactor");
2419 // If it was not set on the command line, set
2420 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2421 if (CMSInitiatingOccupancyFraction < 0) {
2422 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2423 }
2424 }
2425 }
2427 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2428 // insists that we hold the requisite locks so that the iteration is
2429 // MT-safe. For the verification at start-up and shut-down, we don't
2430 // yet have a good way of acquiring and releasing these locks,
2431 // which are not visible at the CollectedHeap level. We want to
2432 // be able to acquire these locks and then do the iteration rather
2433 // than just disable the lock verification. This will be fixed under
2434 // bug 4788986.
2435 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2436 if (VerifyDuringStartup) {
2437 warning("Heap verification at start-up disabled "
2438 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2439 VerifyDuringStartup = false; // Disable verification at start-up
2440 }
2442 if (VerifyBeforeExit) {
2443 warning("Heap verification at shutdown disabled "
2444 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2445 VerifyBeforeExit = false; // Disable verification at shutdown
2446 }
2447 }
2449 // Note: only executed in non-PRODUCT mode
2450 if (!UseAsyncConcMarkSweepGC &&
2451 (ExplicitGCInvokesConcurrent ||
2452 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2453 jio_fprintf(defaultStream::error_stream(),
2454 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2455 " with -UseAsyncConcMarkSweepGC");
2456 status = false;
2457 }
2459 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2461 #if INCLUDE_ALL_GCS
2462 if (UseG1GC) {
2463 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2464 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2465 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2467 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2468 "InitiatingHeapOccupancyPercent");
2469 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2470 "G1RefProcDrainInterval");
2471 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2472 "G1ConcMarkStepDurationMillis");
2473 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2474 "G1ConcRSHotCardLimit");
2475 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2476 "G1ConcRSLogCacheSize");
2477 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2478 "StringDeduplicationAgeThreshold");
2479 }
2480 if (UseConcMarkSweepGC) {
2481 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2482 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2483 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2484 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2486 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2488 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2489 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2490 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2492 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2494 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2495 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2497 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2498 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2499 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2501 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2503 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2505 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2506 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2507 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2508 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2509 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2510 }
2512 if (UseParallelGC || UseParallelOldGC) {
2513 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2514 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2516 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2517 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2519 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2520 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2522 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2524 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2525 }
2526 #endif // INCLUDE_ALL_GCS
2528 status = status && verify_interval(RefDiscoveryPolicy,
2529 ReferenceProcessor::DiscoveryPolicyMin,
2530 ReferenceProcessor::DiscoveryPolicyMax,
2531 "RefDiscoveryPolicy");
2533 // Limit the lower bound of this flag to 1 as it is used in a division
2534 // expression.
2535 status = status && verify_interval(TLABWasteTargetPercent,
2536 1, 100, "TLABWasteTargetPercent");
2538 status = status && verify_object_alignment();
2540 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2541 "CompressedClassSpaceSize");
2543 status = status && verify_interval(MarkStackSizeMax,
2544 1, (max_jint - 1), "MarkStackSizeMax");
2545 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2547 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2549 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2551 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2553 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2554 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2556 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2558 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2559 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2560 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2561 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2563 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2564 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2566 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2567 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2568 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2570 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2571 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2573 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2574 // just for that, so hardcode here.
2575 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2576 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2577 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2578 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2580 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2581 #ifdef COMPILER1
2582 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2583 #endif
2585 if (PrintNMTStatistics) {
2586 #if INCLUDE_NMT
2587 if (MemTracker::tracking_level() == NMT_off) {
2588 #endif // INCLUDE_NMT
2589 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2590 PrintNMTStatistics = false;
2591 #if INCLUDE_NMT
2592 }
2593 #endif
2594 }
2596 // Need to limit the extent of the padding to reasonable size.
2597 // 8K is well beyond the reasonable HW cache line size, even with the
2598 // aggressive prefetching, while still leaving the room for segregating
2599 // among the distinct pages.
2600 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2601 jio_fprintf(defaultStream::error_stream(),
2602 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2603 ContendedPaddingWidth, 0, 8192);
2604 status = false;
2605 }
2607 // Need to enforce the padding not to break the existing field alignments.
2608 // It is sufficient to check against the largest type size.
2609 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2610 jio_fprintf(defaultStream::error_stream(),
2611 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2612 ContendedPaddingWidth, BytesPerLong);
2613 status = false;
2614 }
2616 // Check lower bounds of the code cache
2617 // Template Interpreter code is approximately 3X larger in debug builds.
2618 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2619 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2620 jio_fprintf(defaultStream::error_stream(),
2621 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2622 os::vm_page_size()/K);
2623 status = false;
2624 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2627 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2628 status = false;
2629 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2630 jio_fprintf(defaultStream::error_stream(),
2631 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2632 min_code_cache_size/K);
2633 status = false;
2634 } else if (ReservedCodeCacheSize > 2*G) {
2635 // Code cache size larger than MAXINT is not supported.
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2638 (2*G)/M);
2639 status = false;
2640 }
2642 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2643 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2645 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2646 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2647 }
2649 #ifdef COMPILER1
2650 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2651 #endif
2653 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2654 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2655 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2656 // Check the minimum number of compiler threads
2657 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2659 return status;
2660 }
2662 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2663 const char* option_type) {
2664 if (ignore) return false;
2666 const char* spacer = " ";
2667 if (option_type == NULL) {
2668 option_type = ++spacer; // Set both to the empty string.
2669 }
2671 if (os::obsolete_option(option)) {
2672 jio_fprintf(defaultStream::error_stream(),
2673 "Obsolete %s%soption: %s\n", option_type, spacer,
2674 option->optionString);
2675 return false;
2676 } else {
2677 jio_fprintf(defaultStream::error_stream(),
2678 "Unrecognized %s%soption: %s\n", option_type, spacer,
2679 option->optionString);
2680 return true;
2681 }
2682 }
2684 static const char* user_assertion_options[] = {
2685 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2686 };
2688 static const char* system_assertion_options[] = {
2689 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2690 };
2692 // Return true if any of the strings in null-terminated array 'names' matches.
2693 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2694 // the option must match exactly.
2695 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2696 bool tail_allowed) {
2697 for (/* empty */; *names != NULL; ++names) {
2698 if (match_option(option, *names, tail)) {
2699 if (**tail == '\0' || tail_allowed && **tail == ':') {
2700 return true;
2701 }
2702 }
2703 }
2704 return false;
2705 }
2707 bool Arguments::parse_uintx(const char* value,
2708 uintx* uintx_arg,
2709 uintx min_size) {
2711 // Check the sign first since atomull() parses only unsigned values.
2712 bool value_is_positive = !(*value == '-');
2714 if (value_is_positive) {
2715 julong n;
2716 bool good_return = atomull(value, &n);
2717 if (good_return) {
2718 bool above_minimum = n >= min_size;
2719 bool value_is_too_large = n > max_uintx;
2721 if (above_minimum && !value_is_too_large) {
2722 *uintx_arg = n;
2723 return true;
2724 }
2725 }
2726 }
2727 return false;
2728 }
2730 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2731 julong* long_arg,
2732 julong min_size) {
2733 if (!atomull(s, long_arg)) return arg_unreadable;
2734 return check_memory_size(*long_arg, min_size);
2735 }
2737 // Parse JavaVMInitArgs structure
2739 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2740 // For components of the system classpath.
2741 SysClassPath scp(Arguments::get_sysclasspath());
2742 bool scp_assembly_required = false;
2744 // Save default settings for some mode flags
2745 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2746 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2747 Arguments::_ClipInlining = ClipInlining;
2748 Arguments::_BackgroundCompilation = BackgroundCompilation;
2750 // Setup flags for mixed which is the default
2751 set_mode_flags(_mixed);
2753 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2754 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2755 if (result != JNI_OK) {
2756 return result;
2757 }
2759 // Parse JavaVMInitArgs structure passed in
2760 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2761 if (result != JNI_OK) {
2762 return result;
2763 }
2765 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2766 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2767 if (result != JNI_OK) {
2768 return result;
2769 }
2771 // We need to ensure processor and memory resources have been properly
2772 // configured - which may rely on arguments we just processed - before
2773 // doing the final argument processing. Any argument processing that
2774 // needs to know about processor and memory resources must occur after
2775 // this point.
2777 os::init_container_support();
2779 // Do final processing now that all arguments have been parsed
2780 result = finalize_vm_init_args(&scp, scp_assembly_required);
2781 if (result != JNI_OK) {
2782 return result;
2783 }
2785 return JNI_OK;
2786 }
2788 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2789 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2790 // are dealing with -agentpath (case where name is a path), otherwise with
2791 // -agentlib
2792 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2793 char *_name;
2794 const char *_hprof = "hprof", *_jdwp = "jdwp";
2795 size_t _len_hprof, _len_jdwp, _len_prefix;
2797 if (is_path) {
2798 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2799 return false;
2800 }
2802 _name++; // skip past last path separator
2803 _len_prefix = strlen(JNI_LIB_PREFIX);
2805 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2806 return false;
2807 }
2809 _name += _len_prefix;
2810 _len_hprof = strlen(_hprof);
2811 _len_jdwp = strlen(_jdwp);
2813 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2814 _name += _len_hprof;
2815 }
2816 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2817 _name += _len_jdwp;
2818 }
2819 else {
2820 return false;
2821 }
2823 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2824 return false;
2825 }
2827 return true;
2828 }
2830 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2831 return true;
2832 }
2834 return false;
2835 }
2837 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2838 SysClassPath* scp_p,
2839 bool* scp_assembly_required_p,
2840 Flag::Flags origin) {
2841 // Remaining part of option string
2842 const char* tail;
2844 // iterate over arguments
2845 for (int index = 0; index < args->nOptions; index++) {
2846 bool is_absolute_path = false; // for -agentpath vs -agentlib
2848 const JavaVMOption* option = args->options + index;
2850 if (!match_option(option, "-Djava.class.path", &tail) &&
2851 !match_option(option, "-Dsun.java.command", &tail) &&
2852 !match_option(option, "-Dsun.java.launcher", &tail)) {
2854 // add all jvm options to the jvm_args string. This string
2855 // is used later to set the java.vm.args PerfData string constant.
2856 // the -Djava.class.path and the -Dsun.java.command options are
2857 // omitted from jvm_args string as each have their own PerfData
2858 // string constant object.
2859 build_jvm_args(option->optionString);
2860 }
2862 // -verbose:[class/gc/jni]
2863 if (match_option(option, "-verbose", &tail)) {
2864 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2865 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2866 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2867 } else if (!strcmp(tail, ":gc")) {
2868 FLAG_SET_CMDLINE(bool, PrintGC, true);
2869 } else if (!strcmp(tail, ":jni")) {
2870 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2871 }
2872 // -da / -ea / -disableassertions / -enableassertions
2873 // These accept an optional class/package name separated by a colon, e.g.,
2874 // -da:java.lang.Thread.
2875 } else if (match_option(option, user_assertion_options, &tail, true)) {
2876 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2877 if (*tail == '\0') {
2878 JavaAssertions::setUserClassDefault(enable);
2879 } else {
2880 assert(*tail == ':', "bogus match by match_option()");
2881 JavaAssertions::addOption(tail + 1, enable);
2882 }
2883 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2884 } else if (match_option(option, system_assertion_options, &tail, false)) {
2885 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2886 JavaAssertions::setSystemClassDefault(enable);
2887 // -bootclasspath:
2888 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2889 scp_p->reset_path(tail);
2890 *scp_assembly_required_p = true;
2891 // -bootclasspath/a:
2892 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2893 scp_p->add_suffix(tail);
2894 *scp_assembly_required_p = true;
2895 // -bootclasspath/p:
2896 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2897 scp_p->add_prefix(tail);
2898 *scp_assembly_required_p = true;
2899 // -Xrun
2900 } else if (match_option(option, "-Xrun", &tail)) {
2901 if (tail != NULL) {
2902 const char* pos = strchr(tail, ':');
2903 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2904 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2905 name[len] = '\0';
2907 char *options = NULL;
2908 if(pos != NULL) {
2909 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2910 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2911 }
2912 #if !INCLUDE_JVMTI
2913 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2914 jio_fprintf(defaultStream::error_stream(),
2915 "Profiling and debugging agents are not supported in this VM\n");
2916 return JNI_ERR;
2917 }
2918 #endif // !INCLUDE_JVMTI
2919 add_init_library(name, options);
2920 }
2921 // -agentlib and -agentpath
2922 } else if (match_option(option, "-agentlib:", &tail) ||
2923 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2924 if(tail != NULL) {
2925 const char* pos = strchr(tail, '=');
2926 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2927 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2928 name[len] = '\0';
2930 char *options = NULL;
2931 if(pos != NULL) {
2932 size_t length = strlen(pos + 1) + 1;
2933 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2934 jio_snprintf(options, length, "%s", pos + 1);
2935 }
2936 #if !INCLUDE_JVMTI
2937 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "Profiling and debugging agents are not supported in this VM\n");
2940 return JNI_ERR;
2941 }
2942 #endif // !INCLUDE_JVMTI
2943 add_init_agent(name, options, is_absolute_path);
2944 }
2945 // -javaagent
2946 } else if (match_option(option, "-javaagent:", &tail)) {
2947 #if !INCLUDE_JVMTI
2948 jio_fprintf(defaultStream::error_stream(),
2949 "Instrumentation agents are not supported in this VM\n");
2950 return JNI_ERR;
2951 #else
2952 if(tail != NULL) {
2953 size_t length = strlen(tail) + 1;
2954 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2955 jio_snprintf(options, length, "%s", tail);
2956 add_init_agent("instrument", options, false);
2957 }
2958 #endif // !INCLUDE_JVMTI
2959 // -Xnoclassgc
2960 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2961 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2962 // -Xincgc: i-CMS
2963 } else if (match_option(option, "-Xincgc", &tail)) {
2964 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2965 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2966 // -Xnoincgc: no i-CMS
2967 } else if (match_option(option, "-Xnoincgc", &tail)) {
2968 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2969 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2970 // -Xconcgc
2971 } else if (match_option(option, "-Xconcgc", &tail)) {
2972 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2973 // -Xnoconcgc
2974 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2975 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2976 // -Xbatch
2977 } else if (match_option(option, "-Xbatch", &tail)) {
2978 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2979 // -Xmn for compatibility with other JVM vendors
2980 } else if (match_option(option, "-Xmn", &tail)) {
2981 julong long_initial_young_size = 0;
2982 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2983 if (errcode != arg_in_range) {
2984 jio_fprintf(defaultStream::error_stream(),
2985 "Invalid initial young generation size: %s\n", option->optionString);
2986 describe_range_error(errcode);
2987 return JNI_EINVAL;
2988 }
2989 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2990 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2991 // -Xms
2992 } else if (match_option(option, "-Xms", &tail)) {
2993 julong long_initial_heap_size = 0;
2994 // an initial heap size of 0 means automatically determine
2995 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2996 if (errcode != arg_in_range) {
2997 jio_fprintf(defaultStream::error_stream(),
2998 "Invalid initial heap size: %s\n", option->optionString);
2999 describe_range_error(errcode);
3000 return JNI_EINVAL;
3001 }
3002 set_min_heap_size((uintx)long_initial_heap_size);
3003 // Currently the minimum size and the initial heap sizes are the same.
3004 // Can be overridden with -XX:InitialHeapSize.
3005 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
3006 // -Xmx
3007 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3008 julong long_max_heap_size = 0;
3009 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3010 if (errcode != arg_in_range) {
3011 jio_fprintf(defaultStream::error_stream(),
3012 "Invalid maximum heap size: %s\n", option->optionString);
3013 describe_range_error(errcode);
3014 return JNI_EINVAL;
3015 }
3016 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3017 // Xmaxf
3018 } else if (match_option(option, "-Xmaxf", &tail)) {
3019 char* err;
3020 int maxf = (int)(strtod(tail, &err) * 100);
3021 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3022 jio_fprintf(defaultStream::error_stream(),
3023 "Bad max heap free percentage size: %s\n",
3024 option->optionString);
3025 return JNI_EINVAL;
3026 } else {
3027 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3028 }
3029 // Xminf
3030 } else if (match_option(option, "-Xminf", &tail)) {
3031 char* err;
3032 int minf = (int)(strtod(tail, &err) * 100);
3033 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3034 jio_fprintf(defaultStream::error_stream(),
3035 "Bad min heap free percentage size: %s\n",
3036 option->optionString);
3037 return JNI_EINVAL;
3038 } else {
3039 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3040 }
3041 // -Xss
3042 } else if (match_option(option, "-Xss", &tail)) {
3043 julong long_ThreadStackSize = 0;
3044 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3045 if (errcode != arg_in_range) {
3046 jio_fprintf(defaultStream::error_stream(),
3047 "Invalid thread stack size: %s\n", option->optionString);
3048 describe_range_error(errcode);
3049 return JNI_EINVAL;
3050 }
3051 // Internally track ThreadStackSize in units of 1024 bytes.
3052 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3053 round_to((int)long_ThreadStackSize, K) / K);
3054 // -Xoss
3055 } else if (match_option(option, "-Xoss", &tail)) {
3056 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3057 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3058 julong long_CodeCacheExpansionSize = 0;
3059 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3060 if (errcode != arg_in_range) {
3061 jio_fprintf(defaultStream::error_stream(),
3062 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3063 os::vm_page_size()/K);
3064 return JNI_EINVAL;
3065 }
3066 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3067 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3068 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3069 julong long_ReservedCodeCacheSize = 0;
3071 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3072 if (errcode != arg_in_range) {
3073 jio_fprintf(defaultStream::error_stream(),
3074 "Invalid maximum code cache size: %s.\n", option->optionString);
3075 return JNI_EINVAL;
3076 }
3077 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3078 //-XX:IncreaseFirstTierCompileThresholdAt=
3079 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3080 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3081 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3082 jio_fprintf(defaultStream::error_stream(),
3083 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3084 option->optionString);
3085 return JNI_EINVAL;
3086 }
3087 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3088 // -green
3089 } else if (match_option(option, "-green", &tail)) {
3090 jio_fprintf(defaultStream::error_stream(),
3091 "Green threads support not available\n");
3092 return JNI_EINVAL;
3093 // -native
3094 } else if (match_option(option, "-native", &tail)) {
3095 // HotSpot always uses native threads, ignore silently for compatibility
3096 // -Xsqnopause
3097 } else if (match_option(option, "-Xsqnopause", &tail)) {
3098 // EVM option, ignore silently for compatibility
3099 // -Xrs
3100 } else if (match_option(option, "-Xrs", &tail)) {
3101 // Classic/EVM option, new functionality
3102 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3103 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3104 // change default internal VM signals used - lower case for back compat
3105 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3106 // -Xoptimize
3107 } else if (match_option(option, "-Xoptimize", &tail)) {
3108 // EVM option, ignore silently for compatibility
3109 // -Xprof
3110 } else if (match_option(option, "-Xprof", &tail)) {
3111 #if INCLUDE_FPROF
3112 _has_profile = true;
3113 #else // INCLUDE_FPROF
3114 jio_fprintf(defaultStream::error_stream(),
3115 "Flat profiling is not supported in this VM.\n");
3116 return JNI_ERR;
3117 #endif // INCLUDE_FPROF
3118 // -Xconcurrentio
3119 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3120 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3121 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3122 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3123 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3124 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3126 // -Xinternalversion
3127 } else if (match_option(option, "-Xinternalversion", &tail)) {
3128 jio_fprintf(defaultStream::output_stream(), "%s\n",
3129 VM_Version::internal_vm_info_string());
3130 vm_exit(0);
3131 #ifndef PRODUCT
3132 // -Xprintflags
3133 } else if (match_option(option, "-Xprintflags", &tail)) {
3134 CommandLineFlags::printFlags(tty, false);
3135 vm_exit(0);
3136 #endif
3137 // -D
3138 } else if (match_option(option, "-D", &tail)) {
3139 if (CheckEndorsedAndExtDirs) {
3140 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3141 // abort if -Djava.endorsed.dirs is set
3142 jio_fprintf(defaultStream::output_stream(),
3143 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3144 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3145 return JNI_EINVAL;
3146 }
3147 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3148 // abort if -Djava.ext.dirs is set
3149 jio_fprintf(defaultStream::output_stream(),
3150 "-Djava.ext.dirs will not be supported in a future release.\n"
3151 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3152 return JNI_EINVAL;
3153 }
3154 }
3156 if (!add_property(tail)) {
3157 return JNI_ENOMEM;
3158 }
3159 // Out of the box management support
3160 if (match_option(option, "-Dcom.sun.management", &tail)) {
3161 #if INCLUDE_MANAGEMENT
3162 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3163 #else
3164 jio_fprintf(defaultStream::output_stream(),
3165 "-Dcom.sun.management is not supported in this VM.\n");
3166 return JNI_ERR;
3167 #endif
3168 }
3169 // -Xint
3170 } else if (match_option(option, "-Xint", &tail)) {
3171 set_mode_flags(_int);
3172 // -Xmixed
3173 } else if (match_option(option, "-Xmixed", &tail)) {
3174 set_mode_flags(_mixed);
3175 // -Xcomp
3176 } else if (match_option(option, "-Xcomp", &tail)) {
3177 // for testing the compiler; turn off all flags that inhibit compilation
3178 set_mode_flags(_comp);
3179 // -Xshare:dump
3180 } else if (match_option(option, "-Xshare:dump", &tail)) {
3181 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3182 set_mode_flags(_int); // Prevent compilation, which creates objects
3183 // -Xshare:on
3184 } else if (match_option(option, "-Xshare:on", &tail)) {
3185 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3186 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3187 // -Xshare:auto
3188 } else if (match_option(option, "-Xshare:auto", &tail)) {
3189 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3190 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3191 // -Xshare:off
3192 } else if (match_option(option, "-Xshare:off", &tail)) {
3193 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3194 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3195 // -Xverify
3196 } else if (match_option(option, "-Xverify", &tail)) {
3197 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3198 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3199 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3200 } else if (strcmp(tail, ":remote") == 0) {
3201 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3202 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3203 } else if (strcmp(tail, ":none") == 0) {
3204 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3205 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3206 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3207 return JNI_EINVAL;
3208 }
3209 // -Xdebug
3210 } else if (match_option(option, "-Xdebug", &tail)) {
3211 // note this flag has been used, then ignore
3212 set_xdebug_mode(true);
3213 // -Xnoagent
3214 } else if (match_option(option, "-Xnoagent", &tail)) {
3215 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3216 } else if (match_option(option, "-Xboundthreads", &tail)) {
3217 // Bind user level threads to kernel threads (Solaris only)
3218 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3219 } else if (match_option(option, "-Xloggc:", &tail)) {
3220 // Redirect GC output to the file. -Xloggc:<filename>
3221 // ostream_init_log(), when called will use this filename
3222 // to initialize a fileStream.
3223 _gc_log_filename = strdup(tail);
3224 if (!is_filename_valid(_gc_log_filename)) {
3225 jio_fprintf(defaultStream::output_stream(),
3226 "Invalid file name for use with -Xloggc: Filename can only contain the "
3227 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3228 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3229 return JNI_EINVAL;
3230 }
3231 FLAG_SET_CMDLINE(bool, PrintGC, true);
3232 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3234 // JNI hooks
3235 } else if (match_option(option, "-Xcheck", &tail)) {
3236 if (!strcmp(tail, ":jni")) {
3237 #if !INCLUDE_JNI_CHECK
3238 warning("JNI CHECKING is not supported in this VM");
3239 #else
3240 CheckJNICalls = true;
3241 #endif // INCLUDE_JNI_CHECK
3242 } else if (is_bad_option(option, args->ignoreUnrecognized,
3243 "check")) {
3244 return JNI_EINVAL;
3245 }
3246 } else if (match_option(option, "vfprintf", &tail)) {
3247 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3248 } else if (match_option(option, "exit", &tail)) {
3249 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3250 } else if (match_option(option, "abort", &tail)) {
3251 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3252 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3253 // The last option must always win.
3254 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3255 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3256 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3257 // The last option must always win.
3258 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3259 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3260 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3261 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3262 jio_fprintf(defaultStream::error_stream(),
3263 "Please use CMSClassUnloadingEnabled in place of "
3264 "CMSPermGenSweepingEnabled in the future\n");
3265 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3266 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3267 jio_fprintf(defaultStream::error_stream(),
3268 "Please use -XX:+UseGCOverheadLimit in place of "
3269 "-XX:+UseGCTimeLimit in the future\n");
3270 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3271 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3272 jio_fprintf(defaultStream::error_stream(),
3273 "Please use -XX:-UseGCOverheadLimit in place of "
3274 "-XX:-UseGCTimeLimit in the future\n");
3275 // The TLE options are for compatibility with 1.3 and will be
3276 // removed without notice in a future release. These options
3277 // are not to be documented.
3278 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3279 // No longer used.
3280 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3281 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3282 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3283 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3284 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3285 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3286 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3287 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3288 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3289 // No longer used.
3290 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3291 julong long_tlab_size = 0;
3292 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3293 if (errcode != arg_in_range) {
3294 jio_fprintf(defaultStream::error_stream(),
3295 "Invalid TLAB size: %s\n", option->optionString);
3296 describe_range_error(errcode);
3297 return JNI_EINVAL;
3298 }
3299 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3300 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3301 // No longer used.
3302 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3303 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3304 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3305 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3306 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3307 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3308 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3309 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3310 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3311 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3312 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3313 #if defined(DTRACE_ENABLED)
3314 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3315 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3316 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3317 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3318 #else // defined(DTRACE_ENABLED)
3319 jio_fprintf(defaultStream::error_stream(),
3320 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3321 return JNI_EINVAL;
3322 #endif // defined(DTRACE_ENABLED)
3323 #ifdef ASSERT
3324 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3325 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3326 // disable scavenge before parallel mark-compact
3327 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3328 #endif
3329 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3330 julong cms_blocks_to_claim = (julong)atol(tail);
3331 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3332 jio_fprintf(defaultStream::error_stream(),
3333 "Please use -XX:OldPLABSize in place of "
3334 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3335 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3336 julong cms_blocks_to_claim = (julong)atol(tail);
3337 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3338 jio_fprintf(defaultStream::error_stream(),
3339 "Please use -XX:OldPLABSize in place of "
3340 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3341 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3342 julong old_plab_size = 0;
3343 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3344 if (errcode != arg_in_range) {
3345 jio_fprintf(defaultStream::error_stream(),
3346 "Invalid old PLAB size: %s\n", option->optionString);
3347 describe_range_error(errcode);
3348 return JNI_EINVAL;
3349 }
3350 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3351 jio_fprintf(defaultStream::error_stream(),
3352 "Please use -XX:OldPLABSize in place of "
3353 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3354 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3355 julong young_plab_size = 0;
3356 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3357 if (errcode != arg_in_range) {
3358 jio_fprintf(defaultStream::error_stream(),
3359 "Invalid young PLAB size: %s\n", option->optionString);
3360 describe_range_error(errcode);
3361 return JNI_EINVAL;
3362 }
3363 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3364 jio_fprintf(defaultStream::error_stream(),
3365 "Please use -XX:YoungPLABSize in place of "
3366 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3367 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3368 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3369 julong stack_size = 0;
3370 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3371 if (errcode != arg_in_range) {
3372 jio_fprintf(defaultStream::error_stream(),
3373 "Invalid mark stack size: %s\n", option->optionString);
3374 describe_range_error(errcode);
3375 return JNI_EINVAL;
3376 }
3377 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3378 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3379 julong max_stack_size = 0;
3380 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3381 if (errcode != arg_in_range) {
3382 jio_fprintf(defaultStream::error_stream(),
3383 "Invalid maximum mark stack size: %s\n",
3384 option->optionString);
3385 describe_range_error(errcode);
3386 return JNI_EINVAL;
3387 }
3388 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3389 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3390 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3391 uintx conc_threads = 0;
3392 if (!parse_uintx(tail, &conc_threads, 1)) {
3393 jio_fprintf(defaultStream::error_stream(),
3394 "Invalid concurrent threads: %s\n", option->optionString);
3395 return JNI_EINVAL;
3396 }
3397 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3398 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3399 julong max_direct_memory_size = 0;
3400 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3401 if (errcode != arg_in_range) {
3402 jio_fprintf(defaultStream::error_stream(),
3403 "Invalid maximum direct memory size: %s\n",
3404 option->optionString);
3405 describe_range_error(errcode);
3406 return JNI_EINVAL;
3407 }
3408 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3409 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3410 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3411 // away and will cause VM initialization failures!
3412 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3413 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3414 #if !INCLUDE_MANAGEMENT
3415 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3416 jio_fprintf(defaultStream::error_stream(),
3417 "ManagementServer is not supported in this VM.\n");
3418 return JNI_ERR;
3419 #endif // INCLUDE_MANAGEMENT
3420 #if INCLUDE_JFR
3421 } else if (match_jfr_option(&option)) {
3422 return JNI_EINVAL;
3423 #endif
3424 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3425 // Skip -XX:Flags= since that case has already been handled
3426 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3427 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3428 return JNI_EINVAL;
3429 }
3430 }
3431 // Unknown option
3432 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3433 return JNI_ERR;
3434 }
3435 }
3437 // PrintSharedArchiveAndExit will turn on
3438 // -Xshare:on
3439 // -XX:+TraceClassPaths
3440 if (PrintSharedArchiveAndExit) {
3441 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3442 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3443 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3444 }
3446 // Change the default value for flags which have different default values
3447 // when working with older JDKs.
3448 #ifdef LINUX
3449 if (JDK_Version::current().compare_major(6) <= 0 &&
3450 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3451 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3452 }
3453 #endif // LINUX
3454 fix_appclasspath();
3455 return JNI_OK;
3456 }
3458 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3459 //
3460 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3461 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3462 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3463 // path is treated as the current directory.
3464 //
3465 // This causes problems with CDS, which requires that all directories specified in the classpath
3466 // must be empty. In most cases, applications do NOT want to load classes from the current
3467 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3468 // scripts compatible with CDS.
3469 void Arguments::fix_appclasspath() {
3470 if (IgnoreEmptyClassPaths) {
3471 const char separator = *os::path_separator();
3472 const char* src = _java_class_path->value();
3474 // skip over all the leading empty paths
3475 while (*src == separator) {
3476 src ++;
3477 }
3479 char* copy = os::strdup(src, mtInternal);
3481 // trim all trailing empty paths
3482 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3483 *tail = '\0';
3484 }
3486 char from[3] = {separator, separator, '\0'};
3487 char to [2] = {separator, '\0'};
3488 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3489 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3490 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3491 }
3493 _java_class_path->set_value(copy);
3494 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3495 }
3497 if (!PrintSharedArchiveAndExit) {
3498 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3499 }
3500 }
3502 static bool has_jar_files(const char* directory) {
3503 DIR* dir = os::opendir(directory);
3504 if (dir == NULL) return false;
3506 struct dirent *entry;
3507 bool hasJarFile = false;
3508 while (!hasJarFile && (entry = os::readdir(dir)) != NULL) {
3509 const char* name = entry->d_name;
3510 const char* ext = name + strlen(name) - 4;
3511 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3512 }
3513 os::closedir(dir);
3514 return hasJarFile ;
3515 }
3517 // returns the number of directories in the given path containing JAR files
3518 // If the skip argument is not NULL, it will skip that directory
3519 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3520 const char separator = *os::path_separator();
3521 const char* const end = path + strlen(path);
3522 int nonEmptyDirs = 0;
3523 while (path < end) {
3524 const char* tmp_end = strchr(path, separator);
3525 if (tmp_end == NULL) {
3526 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3527 nonEmptyDirs++;
3528 jio_fprintf(defaultStream::output_stream(),
3529 "Non-empty %s directory: %s\n", type, path);
3530 }
3531 path = end;
3532 } else {
3533 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3534 memcpy(dirpath, path, tmp_end - path);
3535 dirpath[tmp_end - path] = '\0';
3536 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3537 nonEmptyDirs++;
3538 jio_fprintf(defaultStream::output_stream(),
3539 "Non-empty %s directory: %s\n", type, dirpath);
3540 }
3541 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3542 path = tmp_end + 1;
3543 }
3544 }
3545 return nonEmptyDirs;
3546 }
3548 // Returns true if endorsed standards override mechanism and extension mechanism
3549 // are not used.
3550 static bool check_endorsed_and_ext_dirs() {
3551 if (!CheckEndorsedAndExtDirs)
3552 return true;
3554 char endorsedDir[JVM_MAXPATHLEN];
3555 char extDir[JVM_MAXPATHLEN];
3556 const char* fileSep = os::file_separator();
3557 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3558 Arguments::get_java_home(), fileSep, fileSep);
3559 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3560 Arguments::get_java_home(), fileSep, fileSep);
3562 // check endorsed directory
3563 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3565 // check the extension directories but skip the default lib/ext directory
3566 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3568 // List of JAR files installed in the default lib/ext directory.
3569 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3570 static const char* jdk_ext_jars[] = {
3571 "access-bridge-32.jar",
3572 "access-bridge-64.jar",
3573 "access-bridge.jar",
3574 "cldrdata.jar",
3575 "dnsns.jar",
3576 "jaccess.jar",
3577 "jfxrt.jar",
3578 "localedata.jar",
3579 "nashorn.jar",
3580 "sunec.jar",
3581 "sunjce_provider.jar",
3582 "sunmscapi.jar",
3583 "sunpkcs11.jar",
3584 "ucrypto.jar",
3585 "zipfs.jar",
3586 NULL
3587 };
3589 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3590 DIR* dir = os::opendir(extDir);
3591 if (dir != NULL) {
3592 int num_ext_jars = 0;
3593 struct dirent *entry;
3594 while ((entry = os::readdir(dir)) != NULL) {
3595 const char* name = entry->d_name;
3596 const char* ext = name + strlen(name) - 4;
3597 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3598 bool is_jdk_jar = false;
3599 const char* jarfile = NULL;
3600 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3601 if (os::file_name_strcmp(name, jarfile) == 0) {
3602 is_jdk_jar = true;
3603 break;
3604 }
3605 }
3606 if (!is_jdk_jar) {
3607 jio_fprintf(defaultStream::output_stream(),
3608 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3609 num_ext_jars++;
3610 }
3611 }
3612 }
3613 os::closedir(dir);
3614 if (num_ext_jars > 0) {
3615 nonEmptyDirs += 1;
3616 }
3617 }
3619 // check if the default lib/endorsed directory exists; if so, error
3620 dir = os::opendir(endorsedDir);
3621 if (dir != NULL) {
3622 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3623 os::closedir(dir);
3624 nonEmptyDirs += 1;
3625 }
3627 if (nonEmptyDirs > 0) {
3628 jio_fprintf(defaultStream::output_stream(),
3629 "Endorsed standards override mechanism and extension mechanism "
3630 "will not be supported in a future release.\n"
3631 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3632 return false;
3633 }
3635 return true;
3636 }
3638 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3639 // This must be done after all -D arguments have been processed.
3640 scp_p->expand_endorsed();
3642 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3643 // Assemble the bootclasspath elements into the final path.
3644 Arguments::set_sysclasspath(scp_p->combined_path());
3645 }
3647 if (!check_endorsed_and_ext_dirs()) {
3648 return JNI_ERR;
3649 }
3651 // This must be done after all arguments have been processed
3652 // and the container support has been initialized since AggressiveHeap
3653 // relies on the amount of total memory available.
3654 if (AggressiveHeap) {
3655 jint result = set_aggressive_heap_flags();
3656 if (result != JNI_OK) {
3657 return result;
3658 }
3659 }
3660 // This must be done after all arguments have been processed.
3661 // java_compiler() true means set to "NONE" or empty.
3662 if (java_compiler() && !xdebug_mode()) {
3663 // For backwards compatibility, we switch to interpreted mode if
3664 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3665 // not specified.
3666 set_mode_flags(_int);
3667 }
3668 if (CompileThreshold == 0) {
3669 set_mode_flags(_int);
3670 }
3672 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3673 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3674 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3675 }
3677 #ifndef COMPILER2
3678 // Don't degrade server performance for footprint
3679 if (FLAG_IS_DEFAULT(UseLargePages) &&
3680 MaxHeapSize < LargePageHeapSizeThreshold) {
3681 // No need for large granularity pages w/small heaps.
3682 // Note that large pages are enabled/disabled for both the
3683 // Java heap and the code cache.
3684 FLAG_SET_DEFAULT(UseLargePages, false);
3685 }
3687 #else
3688 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3689 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3690 }
3691 #endif
3693 #ifndef TIERED
3694 // Tiered compilation is undefined.
3695 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3696 #endif
3698 // If we are running in a headless jre, force java.awt.headless property
3699 // to be true unless the property has already been set.
3700 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3701 if (os::is_headless_jre()) {
3702 const char* headless = Arguments::get_property("java.awt.headless");
3703 if (headless == NULL) {
3704 char envbuffer[128];
3705 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3706 if (!add_property("java.awt.headless=true")) {
3707 return JNI_ENOMEM;
3708 }
3709 } else {
3710 char buffer[256];
3711 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3712 if (!add_property(buffer)) {
3713 return JNI_ENOMEM;
3714 }
3715 }
3716 }
3717 }
3719 if (!check_vm_args_consistency()) {
3720 return JNI_ERR;
3721 }
3723 return JNI_OK;
3724 }
3726 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3727 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3728 scp_assembly_required_p);
3729 }
3731 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3732 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3733 scp_assembly_required_p);
3734 }
3736 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3737 const int N_MAX_OPTIONS = 64;
3738 const int OPTION_BUFFER_SIZE = 1024;
3739 char buffer[OPTION_BUFFER_SIZE];
3741 // The variable will be ignored if it exceeds the length of the buffer.
3742 // Don't check this variable if user has special privileges
3743 // (e.g. unix su command).
3744 if (os::getenv(name, buffer, sizeof(buffer)) &&
3745 !os::have_special_privileges()) {
3746 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3747 jio_fprintf(defaultStream::error_stream(),
3748 "Picked up %s: %s\n", name, buffer);
3749 char* rd = buffer; // pointer to the input string (rd)
3750 int i;
3751 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3752 while (isspace(*rd)) rd++; // skip whitespace
3753 if (*rd == 0) break; // we re done when the input string is read completely
3755 // The output, option string, overwrites the input string.
3756 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3757 // input string (rd).
3758 char* wrt = rd;
3760 options[i++].optionString = wrt; // Fill in option
3761 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3762 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3763 int quote = *rd; // matching quote to look for
3764 rd++; // don't copy open quote
3765 while (*rd != quote) { // include everything (even spaces) up until quote
3766 if (*rd == 0) { // string termination means unmatched string
3767 jio_fprintf(defaultStream::error_stream(),
3768 "Unmatched quote in %s\n", name);
3769 return JNI_ERR;
3770 }
3771 *wrt++ = *rd++; // copy to option string
3772 }
3773 rd++; // don't copy close quote
3774 } else {
3775 *wrt++ = *rd++; // copy to option string
3776 }
3777 }
3778 // Need to check if we're done before writing a NULL,
3779 // because the write could be to the byte that rd is pointing to.
3780 if (*rd++ == 0) {
3781 *wrt = 0;
3782 break;
3783 }
3784 *wrt = 0; // Zero terminate option
3785 }
3786 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3787 JavaVMInitArgs vm_args;
3788 vm_args.version = JNI_VERSION_1_2;
3789 vm_args.options = options;
3790 vm_args.nOptions = i;
3791 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3793 if (PrintVMOptions) {
3794 const char* tail;
3795 for (int i = 0; i < vm_args.nOptions; i++) {
3796 const JavaVMOption *option = vm_args.options + i;
3797 if (match_option(option, "-XX:", &tail)) {
3798 logOption(tail);
3799 }
3800 }
3801 }
3803 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3804 }
3805 return JNI_OK;
3806 }
3808 void Arguments::set_shared_spaces_flags() {
3809 if (DumpSharedSpaces) {
3810 if (FailOverToOldVerifier) {
3811 // Don't fall back to the old verifier on verification failure. If a
3812 // class fails verification with the split verifier, it might fail the
3813 // CDS runtime verifier constraint check. In that case, we don't want
3814 // to share the class. We only archive classes that pass the split verifier.
3815 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3816 }
3818 if (RequireSharedSpaces) {
3819 warning("cannot dump shared archive while using shared archive");
3820 }
3821 UseSharedSpaces = false;
3822 #ifdef _LP64
3823 if (!UseCompressedOops || !UseCompressedClassPointers) {
3824 vm_exit_during_initialization(
3825 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3826 }
3827 } else {
3828 if (!UseCompressedOops || !UseCompressedClassPointers) {
3829 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3830 }
3831 #endif
3832 }
3833 }
3835 #if !INCLUDE_ALL_GCS
3836 static void force_serial_gc() {
3837 FLAG_SET_DEFAULT(UseSerialGC, true);
3838 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3839 UNSUPPORTED_GC_OPTION(UseG1GC);
3840 UNSUPPORTED_GC_OPTION(UseParallelGC);
3841 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3842 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3843 UNSUPPORTED_GC_OPTION(UseParNewGC);
3844 }
3845 #endif // INCLUDE_ALL_GCS
3847 // Sharing support
3848 // Construct the path to the archive
3849 static char* get_shared_archive_path() {
3850 char *shared_archive_path;
3851 if (SharedArchiveFile == NULL) {
3852 char jvm_path[JVM_MAXPATHLEN];
3853 os::jvm_path(jvm_path, sizeof(jvm_path));
3854 char *end = strrchr(jvm_path, *os::file_separator());
3855 if (end != NULL) *end = '\0';
3856 size_t jvm_path_len = strlen(jvm_path);
3857 size_t file_sep_len = strlen(os::file_separator());
3858 const size_t len = jvm_path_len + file_sep_len + 20;
3859 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3860 if (shared_archive_path != NULL) {
3861 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3862 jvm_path, os::file_separator());
3863 }
3864 } else {
3865 shared_archive_path = os::strdup(SharedArchiveFile, mtInternal);
3866 }
3867 return shared_archive_path;
3868 }
3870 #ifndef PRODUCT
3871 // Determine whether LogVMOutput should be implicitly turned on.
3872 static bool use_vm_log() {
3873 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3874 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3875 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3876 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3877 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3878 return true;
3879 }
3881 #ifdef COMPILER1
3882 if (PrintC1Statistics) {
3883 return true;
3884 }
3885 #endif // COMPILER1
3887 #ifdef COMPILER2
3888 if (PrintOptoAssembly || PrintOptoStatistics) {
3889 return true;
3890 }
3891 #endif // COMPILER2
3893 return false;
3894 }
3895 #endif // PRODUCT
3897 // Parse entry point called from JNI_CreateJavaVM
3899 jint Arguments::parse(const JavaVMInitArgs* args) {
3901 // Remaining part of option string
3902 const char* tail;
3904 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3905 const char* hotspotrc = ".hotspotrc";
3906 bool settings_file_specified = false;
3907 bool needs_hotspotrc_warning = false;
3909 ArgumentsExt::process_options(args);
3911 const char* flags_file;
3912 int index;
3913 for (index = 0; index < args->nOptions; index++) {
3914 const JavaVMOption *option = args->options + index;
3915 if (match_option(option, "-XX:Flags=", &tail)) {
3916 flags_file = tail;
3917 settings_file_specified = true;
3918 }
3919 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3920 PrintVMOptions = true;
3921 }
3922 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3923 PrintVMOptions = false;
3924 }
3925 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3926 IgnoreUnrecognizedVMOptions = true;
3927 }
3928 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3929 IgnoreUnrecognizedVMOptions = false;
3930 }
3931 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3932 CommandLineFlags::printFlags(tty, false);
3933 vm_exit(0);
3934 }
3935 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3936 #if INCLUDE_NMT
3937 // The launcher did not setup nmt environment variable properly.
3938 if (!MemTracker::check_launcher_nmt_support(tail)) {
3939 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3940 }
3942 // Verify if nmt option is valid.
3943 if (MemTracker::verify_nmt_option()) {
3944 // Late initialization, still in single-threaded mode.
3945 if (MemTracker::tracking_level() >= NMT_summary) {
3946 MemTracker::init();
3947 }
3948 } else {
3949 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3950 }
3951 #else
3952 jio_fprintf(defaultStream::error_stream(),
3953 "Native Memory Tracking is not supported in this VM\n");
3954 return JNI_ERR;
3955 #endif
3956 }
3959 #ifndef PRODUCT
3960 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3961 CommandLineFlags::printFlags(tty, true);
3962 vm_exit(0);
3963 }
3964 #endif
3965 }
3967 if (IgnoreUnrecognizedVMOptions) {
3968 // uncast const to modify the flag args->ignoreUnrecognized
3969 *(jboolean*)(&args->ignoreUnrecognized) = true;
3970 }
3972 // Parse specified settings file
3973 if (settings_file_specified) {
3974 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3975 return JNI_EINVAL;
3976 }
3977 } else {
3978 #ifdef ASSERT
3979 // Parse default .hotspotrc settings file
3980 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3981 return JNI_EINVAL;
3982 }
3983 #else
3984 struct stat buf;
3985 if (os::stat(hotspotrc, &buf) == 0) {
3986 needs_hotspotrc_warning = true;
3987 }
3988 #endif
3989 }
3991 if (PrintVMOptions) {
3992 for (index = 0; index < args->nOptions; index++) {
3993 const JavaVMOption *option = args->options + index;
3994 if (match_option(option, "-XX:", &tail)) {
3995 logOption(tail);
3996 }
3997 }
3998 }
4000 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4001 jint result = parse_vm_init_args(args);
4002 if (result != JNI_OK) {
4003 return result;
4004 }
4006 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4007 SharedArchivePath = get_shared_archive_path();
4008 if (SharedArchivePath == NULL) {
4009 return JNI_ENOMEM;
4010 }
4012 // Set up VerifySharedSpaces
4013 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4014 VerifySharedSpaces = true;
4015 }
4017 // Delay warning until here so that we've had a chance to process
4018 // the -XX:-PrintWarnings flag
4019 if (needs_hotspotrc_warning) {
4020 warning("%s file is present but has been ignored. "
4021 "Run with -XX:Flags=%s to load the file.",
4022 hotspotrc, hotspotrc);
4023 }
4025 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
4026 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4027 #endif
4029 #if INCLUDE_ALL_GCS
4030 #if (defined JAVASE_EMBEDDED || defined ARM)
4031 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4032 #endif
4033 #endif
4035 #ifndef PRODUCT
4036 if (TraceBytecodesAt != 0) {
4037 TraceBytecodes = true;
4038 }
4039 if (CountCompiledCalls) {
4040 if (UseCounterDecay) {
4041 warning("UseCounterDecay disabled because CountCalls is set");
4042 UseCounterDecay = false;
4043 }
4044 }
4045 #endif // PRODUCT
4047 // JSR 292 is not supported before 1.7
4048 if (!JDK_Version::is_gte_jdk17x_version()) {
4049 if (EnableInvokeDynamic) {
4050 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4051 warning("JSR 292 is not supported before 1.7. Disabling support.");
4052 }
4053 EnableInvokeDynamic = false;
4054 }
4055 }
4057 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4058 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4059 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4060 }
4061 ScavengeRootsInCode = 1;
4062 }
4064 if (PrintGCDetails) {
4065 // Turn on -verbose:gc options as well
4066 PrintGC = true;
4067 }
4069 if (!JDK_Version::is_gte_jdk18x_version()) {
4070 // To avoid changing the log format for 7 updates this flag is only
4071 // true by default in JDK8 and above.
4072 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4073 FLAG_SET_DEFAULT(PrintGCCause, false);
4074 }
4075 }
4077 // Set object alignment values.
4078 set_object_alignment();
4080 #if !INCLUDE_ALL_GCS
4081 force_serial_gc();
4082 #endif // INCLUDE_ALL_GCS
4083 #if !INCLUDE_CDS
4084 if (DumpSharedSpaces || RequireSharedSpaces) {
4085 jio_fprintf(defaultStream::error_stream(),
4086 "Shared spaces are not supported in this VM\n");
4087 return JNI_ERR;
4088 }
4089 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4090 warning("Shared spaces are not supported in this VM");
4091 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4092 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4093 }
4094 no_shared_spaces("CDS Disabled");
4095 #endif // INCLUDE_CDS
4097 return JNI_OK;
4098 }
4100 jint Arguments::apply_ergo() {
4102 // Set flags based on ergonomics.
4103 set_ergonomics_flags();
4105 set_shared_spaces_flags();
4107 #if defined(SPARC)
4108 // BIS instructions require 'membar' instruction regardless of the number
4109 // of CPUs because in virtualized/container environments which might use only 1
4110 // CPU, BIS instructions may produce incorrect results.
4112 if (FLAG_IS_DEFAULT(AssumeMP)) {
4113 FLAG_SET_DEFAULT(AssumeMP, true);
4114 }
4115 #endif
4117 // Check the GC selections again.
4118 if (!check_gc_consistency()) {
4119 return JNI_EINVAL;
4120 }
4122 if (TieredCompilation) {
4123 set_tiered_flags();
4124 } else {
4125 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4126 if (CompilationPolicyChoice >= 2) {
4127 vm_exit_during_initialization(
4128 "Incompatible compilation policy selected", NULL);
4129 }
4130 }
4131 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4132 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4133 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4134 }
4137 // Set heap size based on available physical memory
4138 set_heap_size();
4140 ArgumentsExt::set_gc_specific_flags();
4142 // Initialize Metaspace flags and alignments.
4143 Metaspace::ergo_initialize();
4145 // Set bytecode rewriting flags
4146 set_bytecode_flags();
4148 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4149 set_aggressive_opts_flags();
4151 // Turn off biased locking for locking debug mode flags,
4152 // which are subtlely different from each other but neither works with
4153 // biased locking.
4154 if (UseHeavyMonitors
4155 #ifdef COMPILER1
4156 || !UseFastLocking
4157 #endif // COMPILER1
4158 ) {
4159 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4160 // flag set to true on command line; warn the user that they
4161 // can't enable biased locking here
4162 warning("Biased Locking is not supported with locking debug flags"
4163 "; ignoring UseBiasedLocking flag." );
4164 }
4165 UseBiasedLocking = false;
4166 }
4168 #ifdef ZERO
4169 // Clear flags not supported on zero.
4170 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4171 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4172 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4173 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4174 #endif // CC_INTERP
4176 #ifdef COMPILER2
4177 if (!EliminateLocks) {
4178 EliminateNestedLocks = false;
4179 }
4180 if (!Inline) {
4181 IncrementalInline = false;
4182 }
4183 #ifndef PRODUCT
4184 if (!IncrementalInline) {
4185 AlwaysIncrementalInline = false;
4186 }
4187 #endif
4188 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4189 // incremental inlining: bump MaxNodeLimit
4190 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4191 }
4192 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4193 // nothing to use the profiling, turn if off
4194 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4195 }
4196 #endif
4198 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4199 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4200 DebugNonSafepoints = true;
4201 }
4203 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4204 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4205 }
4207 if (UseOnStackReplacement && !UseLoopCounter) {
4208 warning("On-stack-replacement requires loop counters; enabling loop counters");
4209 FLAG_SET_DEFAULT(UseLoopCounter, true);
4210 }
4212 #ifndef PRODUCT
4213 if (CompileTheWorld) {
4214 // Force NmethodSweeper to sweep whole CodeCache each time.
4215 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4216 NmethodSweepFraction = 1;
4217 }
4218 }
4220 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4221 if (use_vm_log()) {
4222 LogVMOutput = true;
4223 }
4224 }
4225 #endif // PRODUCT
4227 if (PrintCommandLineFlags) {
4228 CommandLineFlags::printSetFlags(tty);
4229 }
4231 // Apply CPU specific policy for the BiasedLocking
4232 if (UseBiasedLocking) {
4233 if (!VM_Version::use_biased_locking() &&
4234 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4235 UseBiasedLocking = false;
4236 }
4237 }
4238 #ifdef COMPILER2
4239 if (!UseBiasedLocking || EmitSync != 0) {
4240 UseOptoBiasInlining = false;
4241 }
4242 #endif
4244 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4245 // but only if not already set on the commandline
4246 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4247 bool set = false;
4248 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4249 if (!set) {
4250 FLAG_SET_DEFAULT(PauseAtExit, true);
4251 }
4252 }
4254 return JNI_OK;
4255 }
4257 jint Arguments::adjust_after_os() {
4258 if (UseNUMA) {
4259 if (UseParallelGC || UseParallelOldGC) {
4260 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4261 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4262 }
4263 }
4264 // UseNUMAInterleaving is set to ON for all collectors and
4265 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4266 // such as the parallel collector for Linux and Solaris will
4267 // interleave old gen and survivor spaces on top of NUMA
4268 // allocation policy for the eden space.
4269 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4270 // all platforms and ParallelGC on Windows will interleave all
4271 // of the heap spaces across NUMA nodes.
4272 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4273 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4274 }
4275 }
4276 return JNI_OK;
4277 }
4279 int Arguments::PropertyList_count(SystemProperty* pl) {
4280 int count = 0;
4281 while(pl != NULL) {
4282 count++;
4283 pl = pl->next();
4284 }
4285 return count;
4286 }
4288 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4289 assert(key != NULL, "just checking");
4290 SystemProperty* prop;
4291 for (prop = pl; prop != NULL; prop = prop->next()) {
4292 if (strcmp(key, prop->key()) == 0) return prop->value();
4293 }
4294 return NULL;
4295 }
4297 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4298 int count = 0;
4299 const char* ret_val = NULL;
4301 while(pl != NULL) {
4302 if(count >= index) {
4303 ret_val = pl->key();
4304 break;
4305 }
4306 count++;
4307 pl = pl->next();
4308 }
4310 return ret_val;
4311 }
4313 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4314 int count = 0;
4315 char* ret_val = NULL;
4317 while(pl != NULL) {
4318 if(count >= index) {
4319 ret_val = pl->value();
4320 break;
4321 }
4322 count++;
4323 pl = pl->next();
4324 }
4326 return ret_val;
4327 }
4329 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4330 SystemProperty* p = *plist;
4331 if (p == NULL) {
4332 *plist = new_p;
4333 } else {
4334 while (p->next() != NULL) {
4335 p = p->next();
4336 }
4337 p->set_next(new_p);
4338 }
4339 }
4341 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4342 if (plist == NULL)
4343 return;
4345 SystemProperty* new_p = new SystemProperty(k, v, true);
4346 PropertyList_add(plist, new_p);
4347 }
4349 // This add maintains unique property key in the list.
4350 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4351 if (plist == NULL)
4352 return;
4354 // If property key exist then update with new value.
4355 SystemProperty* prop;
4356 for (prop = *plist; prop != NULL; prop = prop->next()) {
4357 if (strcmp(k, prop->key()) == 0) {
4358 if (append) {
4359 prop->append_value(v);
4360 } else {
4361 prop->set_value(v);
4362 }
4363 return;
4364 }
4365 }
4367 PropertyList_add(plist, k, v);
4368 }
4370 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4371 // Returns true if all of the source pointed by src has been copied over to
4372 // the destination buffer pointed by buf. Otherwise, returns false.
4373 // Notes:
4374 // 1. If the length (buflen) of the destination buffer excluding the
4375 // NULL terminator character is not long enough for holding the expanded
4376 // pid characters, it also returns false instead of returning the partially
4377 // expanded one.
4378 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4379 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4380 char* buf, size_t buflen) {
4381 const char* p = src;
4382 char* b = buf;
4383 const char* src_end = &src[srclen];
4384 char* buf_end = &buf[buflen - 1];
4386 while (p < src_end && b < buf_end) {
4387 if (*p == '%') {
4388 switch (*(++p)) {
4389 case '%': // "%%" ==> "%"
4390 *b++ = *p++;
4391 break;
4392 case 'p': { // "%p" ==> current process id
4393 // buf_end points to the character before the last character so
4394 // that we could write '\0' to the end of the buffer.
4395 size_t buf_sz = buf_end - b + 1;
4396 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4398 // if jio_snprintf fails or the buffer is not long enough to hold
4399 // the expanded pid, returns false.
4400 if (ret < 0 || ret >= (int)buf_sz) {
4401 return false;
4402 } else {
4403 b += ret;
4404 assert(*b == '\0', "fail in copy_expand_pid");
4405 if (p == src_end && b == buf_end + 1) {
4406 // reach the end of the buffer.
4407 return true;
4408 }
4409 }
4410 p++;
4411 break;
4412 }
4413 default :
4414 *b++ = '%';
4415 }
4416 } else {
4417 *b++ = *p++;
4418 }
4419 }
4420 *b = '\0';
4421 return (p == src_end); // return false if not all of the source was copied
4422 }