Wed, 09 Oct 2019 16:11:58 +0800
8214542: JFR: Old Object Sample event slow on a deep heap in debug builds
Reviewed-by: egahlin, rwestberg
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(9), JDK_Version::jdk(10) },
323 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
324 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
325 #ifdef PRODUCT
326 { "DesiredMethodLimit",
327 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
328 #endif // PRODUCT
329 { NULL, JDK_Version(0), JDK_Version(0) }
330 };
332 // Returns true if the flag is obsolete and fits into the range specified
333 // for being ignored. In the case that the flag is ignored, the 'version'
334 // value is filled in with the version number when the flag became
335 // obsolete so that that value can be displayed to the user.
336 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
337 int i = 0;
338 assert(version != NULL, "Must provide a version buffer");
339 while (obsolete_jvm_flags[i].name != NULL) {
340 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
341 // <flag>=xxx form
342 // [-|+]<flag> form
343 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
344 ((s[0] == '+' || s[0] == '-') &&
345 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
346 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
347 *version = flag_status.obsoleted_in;
348 return true;
349 }
350 }
351 i++;
352 }
353 return false;
354 }
356 // Constructs the system class path (aka boot class path) from the following
357 // components, in order:
358 //
359 // prefix // from -Xbootclasspath/p:...
360 // endorsed // the expansion of -Djava.endorsed.dirs=...
361 // base // from os::get_system_properties() or -Xbootclasspath=
362 // suffix // from -Xbootclasspath/a:...
363 //
364 // java.endorsed.dirs is a list of directories; any jar or zip files in the
365 // directories are added to the sysclasspath just before the base.
366 //
367 // This could be AllStatic, but it isn't needed after argument processing is
368 // complete.
369 class SysClassPath: public StackObj {
370 public:
371 SysClassPath(const char* base);
372 ~SysClassPath();
374 inline void set_base(const char* base);
375 inline void add_prefix(const char* prefix);
376 inline void add_suffix_to_prefix(const char* suffix);
377 inline void add_suffix(const char* suffix);
378 inline void reset_path(const char* base);
380 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
381 // property. Must be called after all command-line arguments have been
382 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
383 // combined_path().
384 void expand_endorsed();
386 inline const char* get_base() const { return _items[_scp_base]; }
387 inline const char* get_prefix() const { return _items[_scp_prefix]; }
388 inline const char* get_suffix() const { return _items[_scp_suffix]; }
389 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
391 // Combine all the components into a single c-heap-allocated string; caller
392 // must free the string if/when no longer needed.
393 char* combined_path();
395 private:
396 // Utility routines.
397 static char* add_to_path(const char* path, const char* str, bool prepend);
398 static char* add_jars_to_path(char* path, const char* directory);
400 inline void reset_item_at(int index);
402 // Array indices for the items that make up the sysclasspath. All except the
403 // base are allocated in the C heap and freed by this class.
404 enum {
405 _scp_prefix, // from -Xbootclasspath/p:...
406 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
407 _scp_base, // the default sysclasspath
408 _scp_suffix, // from -Xbootclasspath/a:...
409 _scp_nitems // the number of items, must be last.
410 };
412 const char* _items[_scp_nitems];
413 DEBUG_ONLY(bool _expansion_done;)
414 };
416 SysClassPath::SysClassPath(const char* base) {
417 memset(_items, 0, sizeof(_items));
418 _items[_scp_base] = base;
419 DEBUG_ONLY(_expansion_done = false;)
420 }
422 SysClassPath::~SysClassPath() {
423 // Free everything except the base.
424 for (int i = 0; i < _scp_nitems; ++i) {
425 if (i != _scp_base) reset_item_at(i);
426 }
427 DEBUG_ONLY(_expansion_done = false;)
428 }
430 inline void SysClassPath::set_base(const char* base) {
431 _items[_scp_base] = base;
432 }
434 inline void SysClassPath::add_prefix(const char* prefix) {
435 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
436 }
438 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
439 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
440 }
442 inline void SysClassPath::add_suffix(const char* suffix) {
443 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
444 }
446 inline void SysClassPath::reset_item_at(int index) {
447 assert(index < _scp_nitems && index != _scp_base, "just checking");
448 if (_items[index] != NULL) {
449 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
450 _items[index] = NULL;
451 }
452 }
454 inline void SysClassPath::reset_path(const char* base) {
455 // Clear the prefix and suffix.
456 reset_item_at(_scp_prefix);
457 reset_item_at(_scp_suffix);
458 set_base(base);
459 }
461 //------------------------------------------------------------------------------
463 void SysClassPath::expand_endorsed() {
464 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
466 const char* path = Arguments::get_property("java.endorsed.dirs");
467 if (path == NULL) {
468 path = Arguments::get_endorsed_dir();
469 assert(path != NULL, "no default for java.endorsed.dirs");
470 }
472 char* expanded_path = NULL;
473 const char separator = *os::path_separator();
474 const char* const end = path + strlen(path);
475 while (path < end) {
476 const char* tmp_end = strchr(path, separator);
477 if (tmp_end == NULL) {
478 expanded_path = add_jars_to_path(expanded_path, path);
479 path = end;
480 } else {
481 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
482 memcpy(dirpath, path, tmp_end - path);
483 dirpath[tmp_end - path] = '\0';
484 expanded_path = add_jars_to_path(expanded_path, dirpath);
485 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
486 path = tmp_end + 1;
487 }
488 }
489 _items[_scp_endorsed] = expanded_path;
490 DEBUG_ONLY(_expansion_done = true;)
491 }
493 // Combine the bootclasspath elements, some of which may be null, into a single
494 // c-heap-allocated string.
495 char* SysClassPath::combined_path() {
496 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
497 assert(_expansion_done, "must call expand_endorsed() first.");
499 size_t lengths[_scp_nitems];
500 size_t total_len = 0;
502 const char separator = *os::path_separator();
504 // Get the lengths.
505 int i;
506 for (i = 0; i < _scp_nitems; ++i) {
507 if (_items[i] != NULL) {
508 lengths[i] = strlen(_items[i]);
509 // Include space for the separator char (or a NULL for the last item).
510 total_len += lengths[i] + 1;
511 }
512 }
513 assert(total_len > 0, "empty sysclasspath not allowed");
515 // Copy the _items to a single string.
516 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
517 char* cp_tmp = cp;
518 for (i = 0; i < _scp_nitems; ++i) {
519 if (_items[i] != NULL) {
520 memcpy(cp_tmp, _items[i], lengths[i]);
521 cp_tmp += lengths[i];
522 *cp_tmp++ = separator;
523 }
524 }
525 *--cp_tmp = '\0'; // Replace the extra separator.
526 return cp;
527 }
529 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
530 char*
531 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
532 char *cp;
534 assert(str != NULL, "just checking");
535 if (path == NULL) {
536 size_t len = strlen(str) + 1;
537 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
538 memcpy(cp, str, len); // copy the trailing null
539 } else {
540 const char separator = *os::path_separator();
541 size_t old_len = strlen(path);
542 size_t str_len = strlen(str);
543 size_t len = old_len + str_len + 2;
545 if (prepend) {
546 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
547 char* cp_tmp = cp;
548 memcpy(cp_tmp, str, str_len);
549 cp_tmp += str_len;
550 *cp_tmp = separator;
551 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
552 FREE_C_HEAP_ARRAY(char, path, mtInternal);
553 } else {
554 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
555 char* cp_tmp = cp + old_len;
556 *cp_tmp = separator;
557 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
558 }
559 }
560 return cp;
561 }
563 // Scan the directory and append any jar or zip files found to path.
564 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
565 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
566 DIR* dir = os::opendir(directory);
567 if (dir == NULL) return path;
569 char dir_sep[2] = { '\0', '\0' };
570 size_t directory_len = strlen(directory);
571 const char fileSep = *os::file_separator();
572 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
574 /* Scan the directory for jars/zips, appending them to path. */
575 struct dirent *entry;
576 while ((entry = os::readdir(dir)) != NULL) {
577 const char* name = entry->d_name;
578 const char* ext = name + strlen(name) - 4;
579 bool isJarOrZip = ext > name &&
580 (os::file_name_strcmp(ext, ".jar") == 0 ||
581 os::file_name_strcmp(ext, ".zip") == 0);
582 if (isJarOrZip) {
583 size_t length = directory_len + 2 + strlen(name);
584 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
585 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
586 path = add_to_path(path, jarpath, false);
587 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
588 }
589 }
590 os::closedir(dir);
591 return path;
592 }
594 // Parses a memory size specification string.
595 static bool atomull(const char *s, julong* result) {
596 julong n = 0;
597 int args_read = sscanf(s, JULONG_FORMAT, &n);
598 if (args_read != 1) {
599 return false;
600 }
601 while (*s != '\0' && isdigit(*s)) {
602 s++;
603 }
604 // 4705540: illegal if more characters are found after the first non-digit
605 if (strlen(s) > 1) {
606 return false;
607 }
608 switch (*s) {
609 case 'T': case 't':
610 *result = n * G * K;
611 // Check for overflow.
612 if (*result/((julong)G * K) != n) return false;
613 return true;
614 case 'G': case 'g':
615 *result = n * G;
616 if (*result/G != n) return false;
617 return true;
618 case 'M': case 'm':
619 *result = n * M;
620 if (*result/M != n) return false;
621 return true;
622 case 'K': case 'k':
623 *result = n * K;
624 if (*result/K != n) return false;
625 return true;
626 case '\0':
627 *result = n;
628 return true;
629 default:
630 return false;
631 }
632 }
634 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
635 if (size < min_size) return arg_too_small;
636 // Check that size will fit in a size_t (only relevant on 32-bit)
637 if (size > max_uintx) return arg_too_big;
638 return arg_in_range;
639 }
641 // Describe an argument out of range error
642 void Arguments::describe_range_error(ArgsRange errcode) {
643 switch(errcode) {
644 case arg_too_big:
645 jio_fprintf(defaultStream::error_stream(),
646 "The specified size exceeds the maximum "
647 "representable size.\n");
648 break;
649 case arg_too_small:
650 case arg_unreadable:
651 case arg_in_range:
652 // do nothing for now
653 break;
654 default:
655 ShouldNotReachHere();
656 }
657 }
659 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
660 return CommandLineFlags::boolAtPut(name, &value, origin);
661 }
663 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
664 double v;
665 if (sscanf(value, "%lf", &v) != 1) {
666 return false;
667 }
669 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
670 return true;
671 }
672 return false;
673 }
675 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
676 julong v;
677 intx intx_v;
678 bool is_neg = false;
679 // Check the sign first since atomull() parses only unsigned values.
680 if (*value == '-') {
681 if (!CommandLineFlags::intxAt(name, &intx_v)) {
682 return false;
683 }
684 value++;
685 is_neg = true;
686 }
687 if (!atomull(value, &v)) {
688 return false;
689 }
690 intx_v = (intx) v;
691 if (is_neg) {
692 intx_v = -intx_v;
693 }
694 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
695 return true;
696 }
697 uintx uintx_v = (uintx) v;
698 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
699 return true;
700 }
701 uint64_t uint64_t_v = (uint64_t) v;
702 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
703 return true;
704 }
705 return false;
706 }
708 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
709 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
710 // Contract: CommandLineFlags always returns a pointer that needs freeing.
711 FREE_C_HEAP_ARRAY(char, value, mtInternal);
712 return true;
713 }
715 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
716 const char* old_value = "";
717 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
718 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
719 size_t new_len = strlen(new_value);
720 const char* value;
721 char* free_this_too = NULL;
722 if (old_len == 0) {
723 value = new_value;
724 } else if (new_len == 0) {
725 value = old_value;
726 } else {
727 size_t length = old_len + 1 + new_len + 1;
728 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
729 // each new setting adds another LINE to the switch:
730 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
731 value = buf;
732 free_this_too = buf;
733 }
734 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
735 // CommandLineFlags always returns a pointer that needs freeing.
736 FREE_C_HEAP_ARRAY(char, value, mtInternal);
737 if (free_this_too != NULL) {
738 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
739 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
740 }
741 return true;
742 }
744 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
746 // range of acceptable characters spelled out for portability reasons
747 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
748 #define BUFLEN 255
749 char name[BUFLEN+1];
750 char dummy;
752 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
753 return set_bool_flag(name, false, origin);
754 }
755 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
756 return set_bool_flag(name, true, origin);
757 }
759 char punct;
760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
761 const char* value = strchr(arg, '=') + 1;
762 Flag* flag = Flag::find_flag(name, strlen(name));
763 if (flag != NULL && flag->is_ccstr()) {
764 if (flag->ccstr_accumulates()) {
765 return append_to_string_flag(name, value, origin);
766 } else {
767 if (value[0] == '\0') {
768 value = NULL;
769 }
770 return set_string_flag(name, value, origin);
771 }
772 }
773 }
775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
776 const char* value = strchr(arg, '=') + 1;
777 // -XX:Foo:=xxx will reset the string flag to the given value.
778 if (value[0] == '\0') {
779 value = NULL;
780 }
781 return set_string_flag(name, value, origin);
782 }
784 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
785 #define SIGNED_NUMBER_RANGE "[-0123456789]"
786 #define NUMBER_RANGE "[0123456789]"
787 char value[BUFLEN + 1];
788 char value2[BUFLEN + 1];
789 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
790 // Looks like a floating-point number -- try again with more lenient format string
791 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
792 return set_fp_numeric_flag(name, value, origin);
793 }
794 }
796 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
797 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
798 return set_numeric_flag(name, value, origin);
799 }
801 return false;
802 }
804 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
805 assert(bldarray != NULL, "illegal argument");
807 if (arg == NULL) {
808 return;
809 }
811 int new_count = *count + 1;
813 // expand the array and add arg to the last element
814 if (*bldarray == NULL) {
815 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
816 } else {
817 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
818 }
819 (*bldarray)[*count] = strdup(arg);
820 *count = new_count;
821 }
823 void Arguments::build_jvm_args(const char* arg) {
824 add_string(&_jvm_args_array, &_num_jvm_args, arg);
825 }
827 void Arguments::build_jvm_flags(const char* arg) {
828 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
829 }
831 // utility function to return a string that concatenates all
832 // strings in a given char** array
833 const char* Arguments::build_resource_string(char** args, int count) {
834 if (args == NULL || count == 0) {
835 return NULL;
836 }
837 size_t length = 0;
838 for (int i = 0; i < count; i++) {
839 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
840 }
841 char* s = NEW_RESOURCE_ARRAY(char, length);
842 char* dst = s;
843 for (int j = 0; j < count; j++) {
844 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
845 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
846 dst += offset;
847 length -= offset;
848 }
849 return (const char*) s;
850 }
852 void Arguments::print_on(outputStream* st) {
853 st->print_cr("VM Arguments:");
854 if (num_jvm_flags() > 0) {
855 st->print("jvm_flags: "); print_jvm_flags_on(st);
856 }
857 if (num_jvm_args() > 0) {
858 st->print("jvm_args: "); print_jvm_args_on(st);
859 }
860 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
861 if (_java_class_path != NULL) {
862 char* path = _java_class_path->value();
863 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
864 }
865 st->print_cr("Launcher Type: %s", _sun_java_launcher);
866 }
868 void Arguments::print_jvm_flags_on(outputStream* st) {
869 if (_num_jvm_flags > 0) {
870 for (int i=0; i < _num_jvm_flags; i++) {
871 st->print("%s ", _jvm_flags_array[i]);
872 }
873 st->cr();
874 }
875 }
877 void Arguments::print_jvm_args_on(outputStream* st) {
878 if (_num_jvm_args > 0) {
879 for (int i=0; i < _num_jvm_args; i++) {
880 st->print("%s ", _jvm_args_array[i]);
881 }
882 st->cr();
883 }
884 }
886 bool Arguments::process_argument(const char* arg,
887 jboolean ignore_unrecognized, Flag::Flags origin) {
889 JDK_Version since = JDK_Version();
891 if (parse_argument(arg, origin) || ignore_unrecognized) {
892 return true;
893 }
895 bool has_plus_minus = (*arg == '+' || *arg == '-');
896 const char* const argname = has_plus_minus ? arg + 1 : arg;
897 if (is_newly_obsolete(arg, &since)) {
898 char version[256];
899 since.to_string(version, sizeof(version));
900 warning("ignoring option %s; support was removed in %s", argname, version);
901 return true;
902 }
904 // For locked flags, report a custom error message if available.
905 // Otherwise, report the standard unrecognized VM option.
907 size_t arg_len;
908 const char* equal_sign = strchr(argname, '=');
909 if (equal_sign == NULL) {
910 arg_len = strlen(argname);
911 } else {
912 arg_len = equal_sign - argname;
913 }
915 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
916 if (found_flag != NULL) {
917 char locked_message_buf[BUFLEN];
918 found_flag->get_locked_message(locked_message_buf, BUFLEN);
919 if (strlen(locked_message_buf) == 0) {
920 if (found_flag->is_bool() && !has_plus_minus) {
921 jio_fprintf(defaultStream::error_stream(),
922 "Missing +/- setting for VM option '%s'\n", argname);
923 } else if (!found_flag->is_bool() && has_plus_minus) {
924 jio_fprintf(defaultStream::error_stream(),
925 "Unexpected +/- setting in VM option '%s'\n", argname);
926 } else {
927 jio_fprintf(defaultStream::error_stream(),
928 "Improperly specified VM option '%s'\n", argname);
929 }
930 } else {
931 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
932 }
933 } else {
934 jio_fprintf(defaultStream::error_stream(),
935 "Unrecognized VM option '%s'\n", argname);
936 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
937 if (fuzzy_matched != NULL) {
938 jio_fprintf(defaultStream::error_stream(),
939 "Did you mean '%s%s%s'?\n",
940 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
941 fuzzy_matched->_name,
942 (fuzzy_matched->is_bool()) ? "" : "=<value>");
943 }
944 }
946 // allow for commandline "commenting out" options like -XX:#+Verbose
947 return arg[0] == '#';
948 }
950 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
951 FILE* stream = fopen(file_name, "rb");
952 if (stream == NULL) {
953 if (should_exist) {
954 jio_fprintf(defaultStream::error_stream(),
955 "Could not open settings file %s\n", file_name);
956 return false;
957 } else {
958 return true;
959 }
960 }
962 char token[1024];
963 int pos = 0;
965 bool in_white_space = true;
966 bool in_comment = false;
967 bool in_quote = false;
968 char quote_c = 0;
969 bool result = true;
971 int c = getc(stream);
972 while(c != EOF && pos < (int)(sizeof(token)-1)) {
973 if (in_white_space) {
974 if (in_comment) {
975 if (c == '\n') in_comment = false;
976 } else {
977 if (c == '#') in_comment = true;
978 else if (!isspace(c)) {
979 in_white_space = false;
980 token[pos++] = c;
981 }
982 }
983 } else {
984 if (c == '\n' || (!in_quote && isspace(c))) {
985 // token ends at newline, or at unquoted whitespace
986 // this allows a way to include spaces in string-valued options
987 token[pos] = '\0';
988 logOption(token);
989 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
990 build_jvm_flags(token);
991 pos = 0;
992 in_white_space = true;
993 in_quote = false;
994 } else if (!in_quote && (c == '\'' || c == '"')) {
995 in_quote = true;
996 quote_c = c;
997 } else if (in_quote && (c == quote_c)) {
998 in_quote = false;
999 } else {
1000 token[pos++] = c;
1001 }
1002 }
1003 c = getc(stream);
1004 }
1005 if (pos > 0) {
1006 token[pos] = '\0';
1007 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1008 build_jvm_flags(token);
1009 }
1010 fclose(stream);
1011 return result;
1012 }
1014 //=============================================================================================================
1015 // Parsing of properties (-D)
1017 const char* Arguments::get_property(const char* key) {
1018 return PropertyList_get_value(system_properties(), key);
1019 }
1021 bool Arguments::add_property(const char* prop) {
1022 const char* eq = strchr(prop, '=');
1023 char* key;
1024 // ns must be static--its address may be stored in a SystemProperty object.
1025 const static char ns[1] = {0};
1026 char* value = (char *)ns;
1028 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1029 key = AllocateHeap(key_len + 1, mtInternal);
1030 strncpy(key, prop, key_len);
1031 key[key_len] = '\0';
1033 if (eq != NULL) {
1034 size_t value_len = strlen(prop) - key_len - 1;
1035 value = AllocateHeap(value_len + 1, mtInternal);
1036 strncpy(value, &prop[key_len + 1], value_len + 1);
1037 }
1039 if (strcmp(key, "java.compiler") == 0) {
1040 process_java_compiler_argument(value);
1041 FreeHeap(key);
1042 if (eq != NULL) {
1043 FreeHeap(value);
1044 }
1045 return true;
1046 } else if (strcmp(key, "sun.java.command") == 0) {
1047 _java_command = value;
1049 // Record value in Arguments, but let it get passed to Java.
1050 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1051 // launcher.pid property is private and is processed
1052 // in process_sun_java_launcher_properties();
1053 // the sun.java.launcher property is passed on to the java application
1054 FreeHeap(key);
1055 if (eq != NULL) {
1056 FreeHeap(value);
1057 }
1058 return true;
1059 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1060 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1061 // its value without going through the property list or making a Java call.
1062 _java_vendor_url_bug = value;
1063 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1064 PropertyList_unique_add(&_system_properties, key, value, true);
1065 return true;
1066 }
1067 // Create new property and add at the end of the list
1068 PropertyList_unique_add(&_system_properties, key, value);
1069 return true;
1070 }
1072 //===========================================================================================================
1073 // Setting int/mixed/comp mode flags
1075 void Arguments::set_mode_flags(Mode mode) {
1076 // Set up default values for all flags.
1077 // If you add a flag to any of the branches below,
1078 // add a default value for it here.
1079 set_java_compiler(false);
1080 _mode = mode;
1082 // Ensure Agent_OnLoad has the correct initial values.
1083 // This may not be the final mode; mode may change later in onload phase.
1084 PropertyList_unique_add(&_system_properties, "java.vm.info",
1085 (char*)VM_Version::vm_info_string(), false);
1087 UseInterpreter = true;
1088 UseCompiler = true;
1089 UseLoopCounter = true;
1091 #ifndef ZERO
1092 // Turn these off for mixed and comp. Leave them on for Zero.
1093 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1094 UseFastAccessorMethods = (mode == _int);
1095 }
1096 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1097 UseFastEmptyMethods = (mode == _int);
1098 }
1099 #endif
1101 // Default values may be platform/compiler dependent -
1102 // use the saved values
1103 ClipInlining = Arguments::_ClipInlining;
1104 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1105 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1106 BackgroundCompilation = Arguments::_BackgroundCompilation;
1108 // Change from defaults based on mode
1109 switch (mode) {
1110 default:
1111 ShouldNotReachHere();
1112 break;
1113 case _int:
1114 UseCompiler = false;
1115 UseLoopCounter = false;
1116 AlwaysCompileLoopMethods = false;
1117 UseOnStackReplacement = false;
1118 break;
1119 case _mixed:
1120 // same as default
1121 break;
1122 case _comp:
1123 UseInterpreter = false;
1124 BackgroundCompilation = false;
1125 ClipInlining = false;
1126 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1127 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1128 // compile a level 4 (C2) and then continue executing it.
1129 if (TieredCompilation) {
1130 Tier3InvokeNotifyFreqLog = 0;
1131 Tier4InvocationThreshold = 0;
1132 }
1133 break;
1134 }
1135 }
1137 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1138 // Conflict: required to use shared spaces (-Xshare:on), but
1139 // incompatible command line options were chosen.
1141 static void no_shared_spaces(const char* message) {
1142 if (RequireSharedSpaces) {
1143 jio_fprintf(defaultStream::error_stream(),
1144 "Class data sharing is inconsistent with other specified options.\n");
1145 vm_exit_during_initialization("Unable to use shared archive.", message);
1146 } else {
1147 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1148 }
1149 }
1150 #endif
1152 void Arguments::set_tiered_flags() {
1153 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1154 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1155 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1156 }
1157 if (CompilationPolicyChoice < 2) {
1158 vm_exit_during_initialization(
1159 "Incompatible compilation policy selected", NULL);
1160 }
1161 // Increase the code cache size - tiered compiles a lot more.
1162 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1163 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1164 }
1165 if (!UseInterpreter) { // -Xcomp
1166 Tier3InvokeNotifyFreqLog = 0;
1167 Tier4InvocationThreshold = 0;
1168 }
1169 }
1171 /**
1172 * Returns the minimum number of compiler threads needed to run the JVM. The following
1173 * configurations are possible.
1174 *
1175 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1176 * compiler threads is 0.
1177 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1178 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1179 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1180 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1181 * C1 can be used, so the minimum number of compiler threads is 1.
1182 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1183 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1184 * the minimum number of compiler threads is 2.
1185 */
1186 int Arguments::get_min_number_of_compiler_threads() {
1187 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1188 return 0; // case 1
1189 #else
1190 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1191 return 1; // case 2 or case 3
1192 }
1193 return 2; // case 4 (tiered)
1194 #endif
1195 }
1197 #if INCLUDE_ALL_GCS
1198 static void disable_adaptive_size_policy(const char* collector_name) {
1199 if (UseAdaptiveSizePolicy) {
1200 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1201 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1202 collector_name);
1203 }
1204 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1205 }
1206 }
1208 void Arguments::set_parnew_gc_flags() {
1209 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1210 "control point invariant");
1211 assert(UseParNewGC, "Error");
1213 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1214 disable_adaptive_size_policy("UseParNewGC");
1216 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1217 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1218 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1219 } else if (ParallelGCThreads == 0) {
1220 jio_fprintf(defaultStream::error_stream(),
1221 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1222 vm_exit(1);
1223 }
1225 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1226 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1227 // we set them to 1024 and 1024.
1228 // See CR 6362902.
1229 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1230 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1231 }
1232 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1233 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1234 }
1236 // AlwaysTenure flag should make ParNew promote all at first collection.
1237 // See CR 6362902.
1238 if (AlwaysTenure) {
1239 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1240 }
1241 // When using compressed oops, we use local overflow stacks,
1242 // rather than using a global overflow list chained through
1243 // the klass word of the object's pre-image.
1244 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1245 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1246 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1247 }
1248 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1249 }
1250 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1251 }
1253 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1254 // sparc/solaris for certain applications, but would gain from
1255 // further optimization and tuning efforts, and would almost
1256 // certainly gain from analysis of platform and environment.
1257 void Arguments::set_cms_and_parnew_gc_flags() {
1258 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1259 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1261 // If we are using CMS, we prefer to UseParNewGC,
1262 // unless explicitly forbidden.
1263 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1264 FLAG_SET_ERGO(bool, UseParNewGC, true);
1265 }
1267 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1268 disable_adaptive_size_policy("UseConcMarkSweepGC");
1270 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1271 // as needed.
1272 if (UseParNewGC) {
1273 set_parnew_gc_flags();
1274 }
1276 size_t max_heap = align_size_down(MaxHeapSize,
1277 CardTableRS::ct_max_alignment_constraint());
1279 // Now make adjustments for CMS
1280 intx tenuring_default = (intx)6;
1281 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1283 // Preferred young gen size for "short" pauses:
1284 // upper bound depends on # of threads and NewRatio.
1285 const uintx parallel_gc_threads =
1286 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1287 const size_t preferred_max_new_size_unaligned =
1288 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1289 size_t preferred_max_new_size =
1290 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1292 // Unless explicitly requested otherwise, size young gen
1293 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1295 // If either MaxNewSize or NewRatio is set on the command line,
1296 // assume the user is trying to set the size of the young gen.
1297 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1299 // Set MaxNewSize to our calculated preferred_max_new_size unless
1300 // NewSize was set on the command line and it is larger than
1301 // preferred_max_new_size.
1302 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1303 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1304 } else {
1305 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1306 }
1307 if (PrintGCDetails && Verbose) {
1308 // Too early to use gclog_or_tty
1309 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1310 }
1312 // Code along this path potentially sets NewSize and OldSize
1313 if (PrintGCDetails && Verbose) {
1314 // Too early to use gclog_or_tty
1315 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1316 " initial_heap_size: " SIZE_FORMAT
1317 " max_heap: " SIZE_FORMAT,
1318 min_heap_size(), InitialHeapSize, max_heap);
1319 }
1320 size_t min_new = preferred_max_new_size;
1321 if (FLAG_IS_CMDLINE(NewSize)) {
1322 min_new = NewSize;
1323 }
1324 if (max_heap > min_new && min_heap_size() > min_new) {
1325 // Unless explicitly requested otherwise, make young gen
1326 // at least min_new, and at most preferred_max_new_size.
1327 if (FLAG_IS_DEFAULT(NewSize)) {
1328 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1329 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1330 if (PrintGCDetails && Verbose) {
1331 // Too early to use gclog_or_tty
1332 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1333 }
1334 }
1335 // Unless explicitly requested otherwise, size old gen
1336 // so it's NewRatio x of NewSize.
1337 if (FLAG_IS_DEFAULT(OldSize)) {
1338 if (max_heap > NewSize) {
1339 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1340 if (PrintGCDetails && Verbose) {
1341 // Too early to use gclog_or_tty
1342 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1343 }
1344 }
1345 }
1346 }
1347 }
1348 // Unless explicitly requested otherwise, definitely
1349 // promote all objects surviving "tenuring_default" scavenges.
1350 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1351 FLAG_IS_DEFAULT(SurvivorRatio)) {
1352 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1353 }
1354 // If we decided above (or user explicitly requested)
1355 // `promote all' (via MaxTenuringThreshold := 0),
1356 // prefer minuscule survivor spaces so as not to waste
1357 // space for (non-existent) survivors
1358 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1359 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1360 }
1361 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1362 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1363 // This is done in order to make ParNew+CMS configuration to work
1364 // with YoungPLABSize and OldPLABSize options.
1365 // See CR 6362902.
1366 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1367 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1368 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1369 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1370 // the value (either from the command line or ergonomics) of
1371 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1372 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1373 } else {
1374 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1375 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1376 // we'll let it to take precedence.
1377 jio_fprintf(defaultStream::error_stream(),
1378 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1379 " options are specified for the CMS collector."
1380 " CMSParPromoteBlocksToClaim will take precedence.\n");
1381 }
1382 }
1383 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1384 // OldPLAB sizing manually turned off: Use a larger default setting,
1385 // unless it was manually specified. This is because a too-low value
1386 // will slow down scavenges.
1387 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1388 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1389 }
1390 }
1391 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1392 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1393 // If either of the static initialization defaults have changed, note this
1394 // modification.
1395 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1396 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1397 }
1399 if (PrintGCDetails && Verbose) {
1400 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1401 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1402 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1403 }
1404 }
1405 #endif // INCLUDE_ALL_GCS
1407 void set_object_alignment() {
1408 // Object alignment.
1409 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1410 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1411 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1412 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1413 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1414 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1416 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1417 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1419 // Oop encoding heap max
1420 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1422 #if INCLUDE_ALL_GCS
1423 // Set CMS global values
1424 CompactibleFreeListSpace::set_cms_values();
1425 #endif // INCLUDE_ALL_GCS
1426 }
1428 bool verify_object_alignment() {
1429 // Object alignment.
1430 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1431 jio_fprintf(defaultStream::error_stream(),
1432 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1433 (int)ObjectAlignmentInBytes);
1434 return false;
1435 }
1436 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1437 jio_fprintf(defaultStream::error_stream(),
1438 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1439 (int)ObjectAlignmentInBytes, BytesPerLong);
1440 return false;
1441 }
1442 // It does not make sense to have big object alignment
1443 // since a space lost due to alignment will be greater
1444 // then a saved space from compressed oops.
1445 if ((int)ObjectAlignmentInBytes > 256) {
1446 jio_fprintf(defaultStream::error_stream(),
1447 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1448 (int)ObjectAlignmentInBytes);
1449 return false;
1450 }
1451 // In case page size is very small.
1452 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1453 jio_fprintf(defaultStream::error_stream(),
1454 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1455 (int)ObjectAlignmentInBytes, os::vm_page_size());
1456 return false;
1457 }
1458 if(SurvivorAlignmentInBytes == 0) {
1459 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1460 } else {
1461 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1462 jio_fprintf(defaultStream::error_stream(),
1463 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1464 (int)SurvivorAlignmentInBytes);
1465 return false;
1466 }
1467 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1468 jio_fprintf(defaultStream::error_stream(),
1469 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1470 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1471 return false;
1472 }
1473 }
1474 return true;
1475 }
1477 size_t Arguments::max_heap_for_compressed_oops() {
1478 // Avoid sign flip.
1479 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1480 // We need to fit both the NULL page and the heap into the memory budget, while
1481 // keeping alignment constraints of the heap. To guarantee the latter, as the
1482 // NULL page is located before the heap, we pad the NULL page to the conservative
1483 // maximum alignment that the GC may ever impose upon the heap.
1484 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1485 _conservative_max_heap_alignment);
1487 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1488 NOT_LP64(ShouldNotReachHere(); return 0);
1489 }
1491 bool Arguments::should_auto_select_low_pause_collector() {
1492 if (UseAutoGCSelectPolicy &&
1493 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1494 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1495 if (PrintGCDetails) {
1496 // Cannot use gclog_or_tty yet.
1497 tty->print_cr("Automatic selection of the low pause collector"
1498 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1499 }
1500 return true;
1501 }
1502 return false;
1503 }
1505 void Arguments::set_use_compressed_oops() {
1506 #ifndef ZERO
1507 #ifdef _LP64
1508 // MaxHeapSize is not set up properly at this point, but
1509 // the only value that can override MaxHeapSize if we are
1510 // to use UseCompressedOops is InitialHeapSize.
1511 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1513 if (max_heap_size <= max_heap_for_compressed_oops()) {
1514 #if !defined(COMPILER1) || defined(TIERED)
1515 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1516 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1517 }
1518 #endif
1519 #ifdef _WIN64
1520 if (UseLargePages && UseCompressedOops) {
1521 // Cannot allocate guard pages for implicit checks in indexed addressing
1522 // mode, when large pages are specified on windows.
1523 // This flag could be switched ON if narrow oop base address is set to 0,
1524 // see code in Universe::initialize_heap().
1525 Universe::set_narrow_oop_use_implicit_null_checks(false);
1526 }
1527 #endif // _WIN64
1528 } else {
1529 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1530 warning("Max heap size too large for Compressed Oops");
1531 FLAG_SET_DEFAULT(UseCompressedOops, false);
1532 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1533 }
1534 }
1535 #endif // _LP64
1536 #endif // ZERO
1537 }
1540 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1541 // set_use_compressed_oops().
1542 void Arguments::set_use_compressed_klass_ptrs() {
1543 #ifndef ZERO
1544 #ifdef _LP64
1545 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1546 if (!UseCompressedOops) {
1547 if (UseCompressedClassPointers) {
1548 warning("UseCompressedClassPointers requires UseCompressedOops");
1549 }
1550 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1551 } else {
1552 // Turn on UseCompressedClassPointers too
1553 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1554 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1555 }
1556 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1557 if (UseCompressedClassPointers) {
1558 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1559 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1560 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1561 }
1562 }
1563 }
1564 #endif // _LP64
1565 #endif // !ZERO
1566 }
1568 void Arguments::set_conservative_max_heap_alignment() {
1569 // The conservative maximum required alignment for the heap is the maximum of
1570 // the alignments imposed by several sources: any requirements from the heap
1571 // itself, the collector policy and the maximum page size we may run the VM
1572 // with.
1573 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1574 #if INCLUDE_ALL_GCS
1575 if (UseParallelGC) {
1576 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1577 } else if (UseG1GC) {
1578 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1579 }
1580 #endif // INCLUDE_ALL_GCS
1581 _conservative_max_heap_alignment = MAX4(heap_alignment,
1582 (size_t)os::vm_allocation_granularity(),
1583 os::max_page_size(),
1584 CollectorPolicy::compute_heap_alignment());
1585 }
1587 void Arguments::select_gc_ergonomically() {
1588 if (os::is_server_class_machine()) {
1589 if (should_auto_select_low_pause_collector()) {
1590 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1591 } else {
1592 FLAG_SET_ERGO(bool, UseParallelGC, true);
1593 }
1594 }
1595 }
1597 void Arguments::select_gc() {
1598 if (!gc_selected()) {
1599 select_gc_ergonomically();
1600 }
1601 }
1603 void Arguments::set_ergonomics_flags() {
1604 select_gc();
1606 #ifdef COMPILER2
1607 // Shared spaces work fine with other GCs but causes bytecode rewriting
1608 // to be disabled, which hurts interpreter performance and decreases
1609 // server performance. When -server is specified, keep the default off
1610 // unless it is asked for. Future work: either add bytecode rewriting
1611 // at link time, or rewrite bytecodes in non-shared methods.
1612 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1613 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1614 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1615 }
1616 #endif
1618 set_conservative_max_heap_alignment();
1620 #ifndef ZERO
1621 #ifdef _LP64
1622 set_use_compressed_oops();
1624 // set_use_compressed_klass_ptrs() must be called after calling
1625 // set_use_compressed_oops().
1626 set_use_compressed_klass_ptrs();
1628 // Also checks that certain machines are slower with compressed oops
1629 // in vm_version initialization code.
1630 #endif // _LP64
1631 #endif // !ZERO
1632 }
1634 void Arguments::set_parallel_gc_flags() {
1635 assert(UseParallelGC || UseParallelOldGC, "Error");
1636 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1637 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1638 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1639 }
1640 FLAG_SET_DEFAULT(UseParallelGC, true);
1642 // If no heap maximum was requested explicitly, use some reasonable fraction
1643 // of the physical memory, up to a maximum of 1GB.
1644 FLAG_SET_DEFAULT(ParallelGCThreads,
1645 Abstract_VM_Version::parallel_worker_threads());
1646 if (ParallelGCThreads == 0) {
1647 jio_fprintf(defaultStream::error_stream(),
1648 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1649 vm_exit(1);
1650 }
1652 if (UseAdaptiveSizePolicy) {
1653 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1654 // unless the user actually sets these flags.
1655 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1656 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1657 _min_heap_free_ratio = MinHeapFreeRatio;
1658 }
1659 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1660 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1661 _max_heap_free_ratio = MaxHeapFreeRatio;
1662 }
1663 }
1665 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1666 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1667 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1668 // See CR 6362902 for details.
1669 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1670 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1671 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1672 }
1673 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1674 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1675 }
1676 }
1678 if (UseParallelOldGC) {
1679 // Par compact uses lower default values since they are treated as
1680 // minimums. These are different defaults because of the different
1681 // interpretation and are not ergonomically set.
1682 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1683 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1684 }
1685 }
1686 }
1688 void Arguments::set_g1_gc_flags() {
1689 assert(UseG1GC, "Error");
1690 #ifdef COMPILER1
1691 FastTLABRefill = false;
1692 #endif
1693 FLAG_SET_DEFAULT(ParallelGCThreads,
1694 Abstract_VM_Version::parallel_worker_threads());
1695 if (ParallelGCThreads == 0) {
1696 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1697 }
1699 #if INCLUDE_ALL_GCS
1700 if (G1ConcRefinementThreads == 0) {
1701 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1702 }
1703 #endif
1705 // MarkStackSize will be set (if it hasn't been set by the user)
1706 // when concurrent marking is initialized.
1707 // Its value will be based upon the number of parallel marking threads.
1708 // But we do set the maximum mark stack size here.
1709 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1710 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1711 }
1713 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1714 // In G1, we want the default GC overhead goal to be higher than
1715 // say in PS. So we set it here to 10%. Otherwise the heap might
1716 // be expanded more aggressively than we would like it to. In
1717 // fact, even 10% seems to not be high enough in some cases
1718 // (especially small GC stress tests that the main thing they do
1719 // is allocation). We might consider increase it further.
1720 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1721 }
1723 if (PrintGCDetails && Verbose) {
1724 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1725 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1726 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1727 }
1728 }
1730 #if !INCLUDE_ALL_GCS
1731 #ifdef ASSERT
1732 static bool verify_serial_gc_flags() {
1733 return (UseSerialGC &&
1734 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1735 UseParallelGC || UseParallelOldGC));
1736 }
1737 #endif // ASSERT
1738 #endif // INCLUDE_ALL_GCS
1740 void Arguments::set_gc_specific_flags() {
1741 #if INCLUDE_ALL_GCS
1742 // Set per-collector flags
1743 if (UseParallelGC || UseParallelOldGC) {
1744 set_parallel_gc_flags();
1745 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1746 set_cms_and_parnew_gc_flags();
1747 } else if (UseParNewGC) { // Skipped if CMS is set above
1748 set_parnew_gc_flags();
1749 } else if (UseG1GC) {
1750 set_g1_gc_flags();
1751 }
1752 check_deprecated_gcs();
1753 check_deprecated_gc_flags();
1754 if (AssumeMP && !UseSerialGC) {
1755 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1756 warning("If the number of processors is expected to increase from one, then"
1757 " you should configure the number of parallel GC threads appropriately"
1758 " using -XX:ParallelGCThreads=N");
1759 }
1760 }
1761 if (MinHeapFreeRatio == 100) {
1762 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1763 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1764 }
1766 // If class unloading is disabled, also disable concurrent class unloading.
1767 if (!ClassUnloading) {
1768 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1769 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1770 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1771 }
1772 #else // INCLUDE_ALL_GCS
1773 assert(verify_serial_gc_flags(), "SerialGC unset");
1774 #endif // INCLUDE_ALL_GCS
1775 }
1777 julong Arguments::limit_by_allocatable_memory(julong limit) {
1778 julong max_allocatable;
1779 julong result = limit;
1780 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1781 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1782 }
1783 return result;
1784 }
1786 void Arguments::set_heap_size() {
1787 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1788 // Deprecated flag
1789 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1790 }
1792 julong phys_mem =
1793 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1794 : (julong)MaxRAM;
1796 // Experimental support for CGroup memory limits
1797 if (UseCGroupMemoryLimitForHeap) {
1798 // This is a rough indicator that a CGroup limit may be in force
1799 // for this process
1800 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1801 FILE *fp = fopen(lim_file, "r");
1802 if (fp != NULL) {
1803 julong cgroup_max = 0;
1804 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1805 if (ret == 1 && cgroup_max > 0) {
1806 // If unlimited, cgroup_max will be a very large, but unspecified
1807 // value, so use initial phys_mem as a limit
1808 if (PrintGCDetails && Verbose) {
1809 // Cannot use gclog_or_tty yet.
1810 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1811 JULONG_FORMAT "MB) and initial phys_mem ("
1812 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1813 }
1814 phys_mem = MIN2(cgroup_max, phys_mem);
1815 } else {
1816 warning("Unable to read/parse cgroup memory limit from %s: %s",
1817 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1818 }
1819 fclose(fp);
1820 } else {
1821 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1822 }
1823 }
1825 // Convert Fraction to Precentage values
1826 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1827 !FLAG_IS_DEFAULT(MaxRAMFraction))
1828 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1830 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1831 !FLAG_IS_DEFAULT(MinRAMFraction))
1832 MinRAMPercentage = 100.0 / MinRAMFraction;
1834 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1835 !FLAG_IS_DEFAULT(InitialRAMFraction))
1836 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1838 // If the maximum heap size has not been set with -Xmx,
1839 // then set it as fraction of the size of physical memory,
1840 // respecting the maximum and minimum sizes of the heap.
1841 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1842 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1843 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1844 if (reasonable_min < MaxHeapSize) {
1845 // Small physical memory, so use a minimum fraction of it for the heap
1846 reasonable_max = reasonable_min;
1847 } else {
1848 // Not-small physical memory, so require a heap at least
1849 // as large as MaxHeapSize
1850 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1851 }
1853 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1854 // Limit the heap size to ErgoHeapSizeLimit
1855 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1856 }
1857 if (UseCompressedOops) {
1858 // Limit the heap size to the maximum possible when using compressed oops
1859 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1860 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1861 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1862 // but it should be not less than default MaxHeapSize.
1863 max_coop_heap -= HeapBaseMinAddress;
1864 }
1865 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1866 }
1867 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1869 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1870 // An initial heap size was specified on the command line,
1871 // so be sure that the maximum size is consistent. Done
1872 // after call to limit_by_allocatable_memory because that
1873 // method might reduce the allocation size.
1874 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1875 }
1877 if (PrintGCDetails && Verbose) {
1878 // Cannot use gclog_or_tty yet.
1879 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1880 }
1881 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1882 }
1884 // If the minimum or initial heap_size have not been set or requested to be set
1885 // ergonomically, set them accordingly.
1886 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1887 julong reasonable_minimum = (julong)(OldSize + NewSize);
1889 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1891 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1893 if (InitialHeapSize == 0) {
1894 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1896 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1897 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1899 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1901 if (PrintGCDetails && Verbose) {
1902 // Cannot use gclog_or_tty yet.
1903 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1904 }
1905 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1906 }
1907 // If the minimum heap size has not been set (via -Xms),
1908 // synchronize with InitialHeapSize to avoid errors with the default value.
1909 if (min_heap_size() == 0) {
1910 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1911 if (PrintGCDetails && Verbose) {
1912 // Cannot use gclog_or_tty yet.
1913 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1914 }
1915 }
1916 }
1917 }
1919 // This option inspects the machine and attempts to set various
1920 // parameters to be optimal for long-running, memory allocation
1921 // intensive jobs. It is intended for machines with large
1922 // amounts of cpu and memory.
1923 jint Arguments::set_aggressive_heap_flags() {
1924 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1925 // VM, but we may not be able to represent the total physical memory
1926 // available (like having 8gb of memory on a box but using a 32bit VM).
1927 // Thus, we need to make sure we're using a julong for intermediate
1928 // calculations.
1929 julong initHeapSize;
1930 julong total_memory = os::physical_memory();
1932 if (total_memory < (julong) 256 * M) {
1933 jio_fprintf(defaultStream::error_stream(),
1934 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1935 vm_exit(1);
1936 }
1938 // The heap size is half of available memory, or (at most)
1939 // all of possible memory less 160mb (leaving room for the OS
1940 // when using ISM). This is the maximum; because adaptive sizing
1941 // is turned on below, the actual space used may be smaller.
1943 initHeapSize = MIN2(total_memory / (julong) 2,
1944 total_memory - (julong) 160 * M);
1946 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1948 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1949 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
1950 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
1951 // Currently the minimum size and the initial heap sizes are the same.
1952 set_min_heap_size(initHeapSize);
1953 }
1954 if (FLAG_IS_DEFAULT(NewSize)) {
1955 // Make the young generation 3/8ths of the total heap.
1956 FLAG_SET_CMDLINE(uintx, NewSize,
1957 ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
1958 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
1959 }
1961 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
1962 FLAG_SET_DEFAULT(UseLargePages, true);
1963 #endif
1965 // Increase some data structure sizes for efficiency
1966 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
1967 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
1968 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
1970 // See the OldPLABSize comment below, but replace 'after promotion'
1971 // with 'after copying'. YoungPLABSize is the size of the survivor
1972 // space per-gc-thread buffers. The default is 4kw.
1973 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words
1975 // OldPLABSize is the size of the buffers in the old gen that
1976 // UseParallelGC uses to promote live data that doesn't fit in the
1977 // survivor spaces. At any given time, there's one for each gc thread.
1978 // The default size is 1kw. These buffers are rarely used, since the
1979 // survivor spaces are usually big enough. For specjbb, however, there
1980 // are occasions when there's lots of live data in the young gen
1981 // and we end up promoting some of it. We don't have a definite
1982 // explanation for why bumping OldPLABSize helps, but the theory
1983 // is that a bigger PLAB results in retaining something like the
1984 // original allocation order after promotion, which improves mutator
1985 // locality. A minor effect may be that larger PLABs reduce the
1986 // number of PLAB allocation events during gc. The value of 8kw
1987 // was arrived at by experimenting with specjbb.
1988 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words
1990 // Enable parallel GC and adaptive generation sizing
1991 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
1993 // Encourage steady state memory management
1994 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
1996 // This appears to improve mutator locality
1997 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1999 // Get around early Solaris scheduling bug
2000 // (affinity vs other jobs on system)
2001 // but disallow DR and offlining (5008695).
2002 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2004 return JNI_OK;
2005 }
2007 // This must be called after ergonomics because we want bytecode rewriting
2008 // if the server compiler is used, or if UseSharedSpaces is disabled.
2009 void Arguments::set_bytecode_flags() {
2010 // Better not attempt to store into a read-only space.
2011 if (UseSharedSpaces) {
2012 FLAG_SET_DEFAULT(RewriteBytecodes, false);
2013 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2014 }
2016 if (!RewriteBytecodes) {
2017 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2018 }
2019 }
2021 // Aggressive optimization flags -XX:+AggressiveOpts
2022 void Arguments::set_aggressive_opts_flags() {
2023 #ifdef COMPILER2
2024 if (AggressiveUnboxing) {
2025 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2026 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2027 } else if (!EliminateAutoBox) {
2028 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2029 AggressiveUnboxing = false;
2030 }
2031 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2032 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2033 } else if (!DoEscapeAnalysis) {
2034 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2035 AggressiveUnboxing = false;
2036 }
2037 }
2038 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2039 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2040 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2041 }
2042 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2043 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2044 }
2046 // Feed the cache size setting into the JDK
2047 char buffer[1024];
2048 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2049 add_property(buffer);
2050 }
2051 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2052 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2053 }
2054 #endif
2056 if (AggressiveOpts) {
2057 // Sample flag setting code
2058 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2059 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2060 // }
2061 }
2062 }
2064 //===========================================================================================================
2065 // Parsing of java.compiler property
2067 void Arguments::process_java_compiler_argument(char* arg) {
2068 // For backwards compatibility, Djava.compiler=NONE or ""
2069 // causes us to switch to -Xint mode UNLESS -Xdebug
2070 // is also specified.
2071 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2072 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2073 }
2074 }
2076 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2077 _sun_java_launcher = strdup(launcher);
2078 if (strcmp("gamma", _sun_java_launcher) == 0) {
2079 _created_by_gamma_launcher = true;
2080 }
2081 }
2083 bool Arguments::created_by_java_launcher() {
2084 assert(_sun_java_launcher != NULL, "property must have value");
2085 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2086 }
2088 bool Arguments::created_by_gamma_launcher() {
2089 return _created_by_gamma_launcher;
2090 }
2092 //===========================================================================================================
2093 // Parsing of main arguments
2095 bool Arguments::verify_interval(uintx val, uintx min,
2096 uintx max, const char* name) {
2097 // Returns true iff value is in the inclusive interval [min..max]
2098 // false, otherwise.
2099 if (val >= min && val <= max) {
2100 return true;
2101 }
2102 jio_fprintf(defaultStream::error_stream(),
2103 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2104 " and " UINTX_FORMAT "\n",
2105 name, val, min, max);
2106 return false;
2107 }
2109 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2110 // Returns true if given value is at least specified min threshold
2111 // false, otherwise.
2112 if (val >= min ) {
2113 return true;
2114 }
2115 jio_fprintf(defaultStream::error_stream(),
2116 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2117 name, val, min);
2118 return false;
2119 }
2121 bool Arguments::verify_percentage(uintx value, const char* name) {
2122 if (is_percentage(value)) {
2123 return true;
2124 }
2125 jio_fprintf(defaultStream::error_stream(),
2126 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2127 name, value);
2128 return false;
2129 }
2131 // check if do gclog rotation
2132 // +UseGCLogFileRotation is a must,
2133 // no gc log rotation when log file not supplied or
2134 // NumberOfGCLogFiles is 0
2135 void check_gclog_consistency() {
2136 if (UseGCLogFileRotation) {
2137 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2138 jio_fprintf(defaultStream::output_stream(),
2139 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2140 "where num_of_file > 0\n"
2141 "GC log rotation is turned off\n");
2142 UseGCLogFileRotation = false;
2143 }
2144 }
2146 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2147 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2148 jio_fprintf(defaultStream::output_stream(),
2149 "GCLogFileSize changed to minimum 8K\n");
2150 }
2151 }
2153 // This function is called for -Xloggc:<filename>, it can be used
2154 // to check if a given file name(or string) conforms to the following
2155 // specification:
2156 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2157 // %p and %t only allowed once. We only limit usage of filename not path
2158 bool is_filename_valid(const char *file_name) {
2159 const char* p = file_name;
2160 char file_sep = os::file_separator()[0];
2161 const char* cp;
2162 // skip prefix path
2163 for (cp = file_name; *cp != '\0'; cp++) {
2164 if (*cp == '/' || *cp == file_sep) {
2165 p = cp + 1;
2166 }
2167 }
2169 int count_p = 0;
2170 int count_t = 0;
2171 while (*p != '\0') {
2172 if ((*p >= '0' && *p <= '9') ||
2173 (*p >= 'A' && *p <= 'Z') ||
2174 (*p >= 'a' && *p <= 'z') ||
2175 *p == '-' ||
2176 *p == '_' ||
2177 *p == '.') {
2178 p++;
2179 continue;
2180 }
2181 if (*p == '%') {
2182 if(*(p + 1) == 'p') {
2183 p += 2;
2184 count_p ++;
2185 continue;
2186 }
2187 if (*(p + 1) == 't') {
2188 p += 2;
2189 count_t ++;
2190 continue;
2191 }
2192 }
2193 return false;
2194 }
2195 return count_p < 2 && count_t < 2;
2196 }
2198 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2199 if (!is_percentage(min_heap_free_ratio)) {
2200 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2201 return false;
2202 }
2203 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2204 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2205 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2206 MaxHeapFreeRatio);
2207 return false;
2208 }
2209 // This does not set the flag itself, but stores the value in a safe place for later usage.
2210 _min_heap_free_ratio = min_heap_free_ratio;
2211 return true;
2212 }
2214 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2215 if (!is_percentage(max_heap_free_ratio)) {
2216 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2217 return false;
2218 }
2219 if (max_heap_free_ratio < MinHeapFreeRatio) {
2220 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2221 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2222 MinHeapFreeRatio);
2223 return false;
2224 }
2225 // This does not set the flag itself, but stores the value in a safe place for later usage.
2226 _max_heap_free_ratio = max_heap_free_ratio;
2227 return true;
2228 }
2230 // Check consistency of GC selection
2231 bool Arguments::check_gc_consistency() {
2232 check_gclog_consistency();
2233 bool status = true;
2234 // Ensure that the user has not selected conflicting sets
2235 // of collectors. [Note: this check is merely a user convenience;
2236 // collectors over-ride each other so that only a non-conflicting
2237 // set is selected; however what the user gets is not what they
2238 // may have expected from the combination they asked for. It's
2239 // better to reduce user confusion by not allowing them to
2240 // select conflicting combinations.
2241 uint i = 0;
2242 if (UseSerialGC) i++;
2243 if (UseConcMarkSweepGC || UseParNewGC) i++;
2244 if (UseParallelGC || UseParallelOldGC) i++;
2245 if (UseG1GC) i++;
2246 if (i > 1) {
2247 jio_fprintf(defaultStream::error_stream(),
2248 "Conflicting collector combinations in option list; "
2249 "please refer to the release notes for the combinations "
2250 "allowed\n");
2251 status = false;
2252 }
2253 return status;
2254 }
2256 void Arguments::check_deprecated_gcs() {
2257 if (UseConcMarkSweepGC && !UseParNewGC) {
2258 warning("Using the DefNew young collector with the CMS collector is deprecated "
2259 "and will likely be removed in a future release");
2260 }
2262 if (UseParNewGC && !UseConcMarkSweepGC) {
2263 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2264 // set up UseSerialGC properly, so that can't be used in the check here.
2265 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2266 "and will likely be removed in a future release");
2267 }
2269 if (CMSIncrementalMode) {
2270 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2271 }
2272 }
2274 void Arguments::check_deprecated_gc_flags() {
2275 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2276 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2277 "and will likely be removed in future release");
2278 }
2279 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2280 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2281 "Use MaxRAMFraction instead.");
2282 }
2283 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2284 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2285 }
2286 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2287 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2288 }
2289 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2290 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2291 }
2292 }
2294 // Check stack pages settings
2295 bool Arguments::check_stack_pages()
2296 {
2297 bool status = true;
2298 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2299 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2300 // greater stack shadow pages can't generate instruction to bang stack
2301 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2302 return status;
2303 }
2305 // Check the consistency of vm_init_args
2306 bool Arguments::check_vm_args_consistency() {
2307 // Method for adding checks for flag consistency.
2308 // The intent is to warn the user of all possible conflicts,
2309 // before returning an error.
2310 // Note: Needs platform-dependent factoring.
2311 bool status = true;
2313 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2314 // builds so the cost of stack banging can be measured.
2315 #if (defined(PRODUCT) && defined(SOLARIS))
2316 if (!UseBoundThreads && !UseStackBanging) {
2317 jio_fprintf(defaultStream::error_stream(),
2318 "-UseStackBanging conflicts with -UseBoundThreads\n");
2320 status = false;
2321 }
2322 #endif
2324 if (TLABRefillWasteFraction == 0) {
2325 jio_fprintf(defaultStream::error_stream(),
2326 "TLABRefillWasteFraction should be a denominator, "
2327 "not " SIZE_FORMAT "\n",
2328 TLABRefillWasteFraction);
2329 status = false;
2330 }
2332 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2333 "AdaptiveSizePolicyWeight");
2334 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2336 // Divide by bucket size to prevent a large size from causing rollover when
2337 // calculating amount of memory needed to be allocated for the String table.
2338 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2339 (max_uintx / StringTable::bucket_size()), "StringTable size");
2341 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2342 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2344 {
2345 // Using "else if" below to avoid printing two error messages if min > max.
2346 // This will also prevent us from reporting both min>100 and max>100 at the
2347 // same time, but that is less annoying than printing two identical errors IMHO.
2348 FormatBuffer<80> err_msg("%s","");
2349 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2350 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2351 status = false;
2352 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2353 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2354 status = false;
2355 }
2356 }
2358 // Min/MaxMetaspaceFreeRatio
2359 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2360 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2362 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2363 jio_fprintf(defaultStream::error_stream(),
2364 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2365 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2366 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2367 MinMetaspaceFreeRatio,
2368 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2369 MaxMetaspaceFreeRatio);
2370 status = false;
2371 }
2373 // Trying to keep 100% free is not practical
2374 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2376 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2377 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2378 }
2380 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2381 // Settings to encourage splitting.
2382 if (!FLAG_IS_CMDLINE(NewRatio)) {
2383 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2384 }
2385 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2386 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2387 }
2388 }
2390 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2391 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2392 if (GCTimeLimit == 100) {
2393 // Turn off gc-overhead-limit-exceeded checks
2394 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2395 }
2397 status = status && check_gc_consistency();
2398 status = status && check_stack_pages();
2400 if (CMSIncrementalMode) {
2401 if (!UseConcMarkSweepGC) {
2402 jio_fprintf(defaultStream::error_stream(),
2403 "error: invalid argument combination.\n"
2404 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2405 "selected in order\nto use CMSIncrementalMode.\n");
2406 status = false;
2407 } else {
2408 status = status && verify_percentage(CMSIncrementalDutyCycle,
2409 "CMSIncrementalDutyCycle");
2410 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2411 "CMSIncrementalDutyCycleMin");
2412 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2413 "CMSIncrementalSafetyFactor");
2414 status = status && verify_percentage(CMSIncrementalOffset,
2415 "CMSIncrementalOffset");
2416 status = status && verify_percentage(CMSExpAvgFactor,
2417 "CMSExpAvgFactor");
2418 // If it was not set on the command line, set
2419 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2420 if (CMSInitiatingOccupancyFraction < 0) {
2421 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2422 }
2423 }
2424 }
2426 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2427 // insists that we hold the requisite locks so that the iteration is
2428 // MT-safe. For the verification at start-up and shut-down, we don't
2429 // yet have a good way of acquiring and releasing these locks,
2430 // which are not visible at the CollectedHeap level. We want to
2431 // be able to acquire these locks and then do the iteration rather
2432 // than just disable the lock verification. This will be fixed under
2433 // bug 4788986.
2434 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2435 if (VerifyDuringStartup) {
2436 warning("Heap verification at start-up disabled "
2437 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2438 VerifyDuringStartup = false; // Disable verification at start-up
2439 }
2441 if (VerifyBeforeExit) {
2442 warning("Heap verification at shutdown disabled "
2443 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2444 VerifyBeforeExit = false; // Disable verification at shutdown
2445 }
2446 }
2448 // Note: only executed in non-PRODUCT mode
2449 if (!UseAsyncConcMarkSweepGC &&
2450 (ExplicitGCInvokesConcurrent ||
2451 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2452 jio_fprintf(defaultStream::error_stream(),
2453 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2454 " with -UseAsyncConcMarkSweepGC");
2455 status = false;
2456 }
2458 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2460 #if INCLUDE_ALL_GCS
2461 if (UseG1GC) {
2462 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2463 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2464 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2466 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2467 "InitiatingHeapOccupancyPercent");
2468 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2469 "G1RefProcDrainInterval");
2470 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2471 "G1ConcMarkStepDurationMillis");
2472 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2473 "G1ConcRSHotCardLimit");
2474 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2475 "G1ConcRSLogCacheSize");
2476 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2477 "StringDeduplicationAgeThreshold");
2478 }
2479 if (UseConcMarkSweepGC) {
2480 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2481 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2482 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2483 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2485 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2487 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2488 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2489 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2491 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2493 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2494 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2496 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2497 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2498 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2500 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2502 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2504 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2505 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2506 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2507 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2508 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2509 }
2511 if (UseParallelGC || UseParallelOldGC) {
2512 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2513 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2515 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2516 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2518 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2519 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2521 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2523 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2524 }
2525 #endif // INCLUDE_ALL_GCS
2527 status = status && verify_interval(RefDiscoveryPolicy,
2528 ReferenceProcessor::DiscoveryPolicyMin,
2529 ReferenceProcessor::DiscoveryPolicyMax,
2530 "RefDiscoveryPolicy");
2532 // Limit the lower bound of this flag to 1 as it is used in a division
2533 // expression.
2534 status = status && verify_interval(TLABWasteTargetPercent,
2535 1, 100, "TLABWasteTargetPercent");
2537 status = status && verify_object_alignment();
2539 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2540 "CompressedClassSpaceSize");
2542 status = status && verify_interval(MarkStackSizeMax,
2543 1, (max_jint - 1), "MarkStackSizeMax");
2544 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2546 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2548 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2550 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2552 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2553 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2555 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2557 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2558 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2559 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2560 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2562 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2563 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2565 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2566 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2567 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2569 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2570 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2572 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2573 // just for that, so hardcode here.
2574 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2575 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2576 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2577 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2579 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2580 #ifdef COMPILER1
2581 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2582 #endif
2584 if (PrintNMTStatistics) {
2585 #if INCLUDE_NMT
2586 if (MemTracker::tracking_level() == NMT_off) {
2587 #endif // INCLUDE_NMT
2588 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2589 PrintNMTStatistics = false;
2590 #if INCLUDE_NMT
2591 }
2592 #endif
2593 }
2595 // Need to limit the extent of the padding to reasonable size.
2596 // 8K is well beyond the reasonable HW cache line size, even with the
2597 // aggressive prefetching, while still leaving the room for segregating
2598 // among the distinct pages.
2599 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2600 jio_fprintf(defaultStream::error_stream(),
2601 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2602 ContendedPaddingWidth, 0, 8192);
2603 status = false;
2604 }
2606 // Need to enforce the padding not to break the existing field alignments.
2607 // It is sufficient to check against the largest type size.
2608 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2609 jio_fprintf(defaultStream::error_stream(),
2610 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2611 ContendedPaddingWidth, BytesPerLong);
2612 status = false;
2613 }
2615 // Check lower bounds of the code cache
2616 // Template Interpreter code is approximately 3X larger in debug builds.
2617 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2618 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2619 jio_fprintf(defaultStream::error_stream(),
2620 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2621 os::vm_page_size()/K);
2622 status = false;
2623 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2626 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2627 status = false;
2628 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2629 jio_fprintf(defaultStream::error_stream(),
2630 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2631 min_code_cache_size/K);
2632 status = false;
2633 } else if (ReservedCodeCacheSize > 2*G) {
2634 // Code cache size larger than MAXINT is not supported.
2635 jio_fprintf(defaultStream::error_stream(),
2636 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2637 (2*G)/M);
2638 status = false;
2639 }
2641 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2642 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2644 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2645 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2646 }
2648 #ifdef COMPILER1
2649 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2650 #endif
2652 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2653 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2654 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2655 // Check the minimum number of compiler threads
2656 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2658 return status;
2659 }
2661 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2662 const char* option_type) {
2663 if (ignore) return false;
2665 const char* spacer = " ";
2666 if (option_type == NULL) {
2667 option_type = ++spacer; // Set both to the empty string.
2668 }
2670 if (os::obsolete_option(option)) {
2671 jio_fprintf(defaultStream::error_stream(),
2672 "Obsolete %s%soption: %s\n", option_type, spacer,
2673 option->optionString);
2674 return false;
2675 } else {
2676 jio_fprintf(defaultStream::error_stream(),
2677 "Unrecognized %s%soption: %s\n", option_type, spacer,
2678 option->optionString);
2679 return true;
2680 }
2681 }
2683 static const char* user_assertion_options[] = {
2684 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2685 };
2687 static const char* system_assertion_options[] = {
2688 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2689 };
2691 // Return true if any of the strings in null-terminated array 'names' matches.
2692 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2693 // the option must match exactly.
2694 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2695 bool tail_allowed) {
2696 for (/* empty */; *names != NULL; ++names) {
2697 if (match_option(option, *names, tail)) {
2698 if (**tail == '\0' || tail_allowed && **tail == ':') {
2699 return true;
2700 }
2701 }
2702 }
2703 return false;
2704 }
2706 bool Arguments::parse_uintx(const char* value,
2707 uintx* uintx_arg,
2708 uintx min_size) {
2710 // Check the sign first since atomull() parses only unsigned values.
2711 bool value_is_positive = !(*value == '-');
2713 if (value_is_positive) {
2714 julong n;
2715 bool good_return = atomull(value, &n);
2716 if (good_return) {
2717 bool above_minimum = n >= min_size;
2718 bool value_is_too_large = n > max_uintx;
2720 if (above_minimum && !value_is_too_large) {
2721 *uintx_arg = n;
2722 return true;
2723 }
2724 }
2725 }
2726 return false;
2727 }
2729 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2730 julong* long_arg,
2731 julong min_size) {
2732 if (!atomull(s, long_arg)) return arg_unreadable;
2733 return check_memory_size(*long_arg, min_size);
2734 }
2736 // Parse JavaVMInitArgs structure
2738 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2739 // For components of the system classpath.
2740 SysClassPath scp(Arguments::get_sysclasspath());
2741 bool scp_assembly_required = false;
2743 // Save default settings for some mode flags
2744 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2745 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2746 Arguments::_ClipInlining = ClipInlining;
2747 Arguments::_BackgroundCompilation = BackgroundCompilation;
2749 // Setup flags for mixed which is the default
2750 set_mode_flags(_mixed);
2752 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2753 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2754 if (result != JNI_OK) {
2755 return result;
2756 }
2758 // Parse JavaVMInitArgs structure passed in
2759 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2760 if (result != JNI_OK) {
2761 return result;
2762 }
2764 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2765 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2766 if (result != JNI_OK) {
2767 return result;
2768 }
2770 // We need to ensure processor and memory resources have been properly
2771 // configured - which may rely on arguments we just processed - before
2772 // doing the final argument processing. Any argument processing that
2773 // needs to know about processor and memory resources must occur after
2774 // this point.
2776 os::init_container_support();
2778 // Do final processing now that all arguments have been parsed
2779 result = finalize_vm_init_args(&scp, scp_assembly_required);
2780 if (result != JNI_OK) {
2781 return result;
2782 }
2784 return JNI_OK;
2785 }
2787 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2788 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2789 // are dealing with -agentpath (case where name is a path), otherwise with
2790 // -agentlib
2791 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2792 char *_name;
2793 const char *_hprof = "hprof", *_jdwp = "jdwp";
2794 size_t _len_hprof, _len_jdwp, _len_prefix;
2796 if (is_path) {
2797 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2798 return false;
2799 }
2801 _name++; // skip past last path separator
2802 _len_prefix = strlen(JNI_LIB_PREFIX);
2804 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2805 return false;
2806 }
2808 _name += _len_prefix;
2809 _len_hprof = strlen(_hprof);
2810 _len_jdwp = strlen(_jdwp);
2812 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2813 _name += _len_hprof;
2814 }
2815 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2816 _name += _len_jdwp;
2817 }
2818 else {
2819 return false;
2820 }
2822 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2823 return false;
2824 }
2826 return true;
2827 }
2829 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2830 return true;
2831 }
2833 return false;
2834 }
2836 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2837 SysClassPath* scp_p,
2838 bool* scp_assembly_required_p,
2839 Flag::Flags origin) {
2840 // Remaining part of option string
2841 const char* tail;
2843 // iterate over arguments
2844 for (int index = 0; index < args->nOptions; index++) {
2845 bool is_absolute_path = false; // for -agentpath vs -agentlib
2847 const JavaVMOption* option = args->options + index;
2849 if (!match_option(option, "-Djava.class.path", &tail) &&
2850 !match_option(option, "-Dsun.java.command", &tail) &&
2851 !match_option(option, "-Dsun.java.launcher", &tail)) {
2853 // add all jvm options to the jvm_args string. This string
2854 // is used later to set the java.vm.args PerfData string constant.
2855 // the -Djava.class.path and the -Dsun.java.command options are
2856 // omitted from jvm_args string as each have their own PerfData
2857 // string constant object.
2858 build_jvm_args(option->optionString);
2859 }
2861 // -verbose:[class/gc/jni]
2862 if (match_option(option, "-verbose", &tail)) {
2863 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2864 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2865 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2866 } else if (!strcmp(tail, ":gc")) {
2867 FLAG_SET_CMDLINE(bool, PrintGC, true);
2868 } else if (!strcmp(tail, ":jni")) {
2869 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2870 }
2871 // -da / -ea / -disableassertions / -enableassertions
2872 // These accept an optional class/package name separated by a colon, e.g.,
2873 // -da:java.lang.Thread.
2874 } else if (match_option(option, user_assertion_options, &tail, true)) {
2875 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2876 if (*tail == '\0') {
2877 JavaAssertions::setUserClassDefault(enable);
2878 } else {
2879 assert(*tail == ':', "bogus match by match_option()");
2880 JavaAssertions::addOption(tail + 1, enable);
2881 }
2882 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2883 } else if (match_option(option, system_assertion_options, &tail, false)) {
2884 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2885 JavaAssertions::setSystemClassDefault(enable);
2886 // -bootclasspath:
2887 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2888 scp_p->reset_path(tail);
2889 *scp_assembly_required_p = true;
2890 // -bootclasspath/a:
2891 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2892 scp_p->add_suffix(tail);
2893 *scp_assembly_required_p = true;
2894 // -bootclasspath/p:
2895 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2896 scp_p->add_prefix(tail);
2897 *scp_assembly_required_p = true;
2898 // -Xrun
2899 } else if (match_option(option, "-Xrun", &tail)) {
2900 if (tail != NULL) {
2901 const char* pos = strchr(tail, ':');
2902 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2903 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2904 name[len] = '\0';
2906 char *options = NULL;
2907 if(pos != NULL) {
2908 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2909 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2910 }
2911 #if !INCLUDE_JVMTI
2912 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2913 jio_fprintf(defaultStream::error_stream(),
2914 "Profiling and debugging agents are not supported in this VM\n");
2915 return JNI_ERR;
2916 }
2917 #endif // !INCLUDE_JVMTI
2918 add_init_library(name, options);
2919 }
2920 // -agentlib and -agentpath
2921 } else if (match_option(option, "-agentlib:", &tail) ||
2922 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2923 if(tail != NULL) {
2924 const char* pos = strchr(tail, '=');
2925 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2926 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2927 name[len] = '\0';
2929 char *options = NULL;
2930 if(pos != NULL) {
2931 size_t length = strlen(pos + 1) + 1;
2932 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2933 jio_snprintf(options, length, "%s", pos + 1);
2934 }
2935 #if !INCLUDE_JVMTI
2936 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2937 jio_fprintf(defaultStream::error_stream(),
2938 "Profiling and debugging agents are not supported in this VM\n");
2939 return JNI_ERR;
2940 }
2941 #endif // !INCLUDE_JVMTI
2942 add_init_agent(name, options, is_absolute_path);
2943 }
2944 // -javaagent
2945 } else if (match_option(option, "-javaagent:", &tail)) {
2946 #if !INCLUDE_JVMTI
2947 jio_fprintf(defaultStream::error_stream(),
2948 "Instrumentation agents are not supported in this VM\n");
2949 return JNI_ERR;
2950 #else
2951 if(tail != NULL) {
2952 size_t length = strlen(tail) + 1;
2953 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2954 jio_snprintf(options, length, "%s", tail);
2955 add_init_agent("instrument", options, false);
2956 }
2957 #endif // !INCLUDE_JVMTI
2958 // -Xnoclassgc
2959 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2960 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2961 // -Xincgc: i-CMS
2962 } else if (match_option(option, "-Xincgc", &tail)) {
2963 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2964 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2965 // -Xnoincgc: no i-CMS
2966 } else if (match_option(option, "-Xnoincgc", &tail)) {
2967 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2968 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2969 // -Xconcgc
2970 } else if (match_option(option, "-Xconcgc", &tail)) {
2971 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2972 // -Xnoconcgc
2973 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2974 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2975 // -Xbatch
2976 } else if (match_option(option, "-Xbatch", &tail)) {
2977 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2978 // -Xmn for compatibility with other JVM vendors
2979 } else if (match_option(option, "-Xmn", &tail)) {
2980 julong long_initial_young_size = 0;
2981 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2982 if (errcode != arg_in_range) {
2983 jio_fprintf(defaultStream::error_stream(),
2984 "Invalid initial young generation size: %s\n", option->optionString);
2985 describe_range_error(errcode);
2986 return JNI_EINVAL;
2987 }
2988 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2989 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2990 // -Xms
2991 } else if (match_option(option, "-Xms", &tail)) {
2992 julong long_initial_heap_size = 0;
2993 // an initial heap size of 0 means automatically determine
2994 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2995 if (errcode != arg_in_range) {
2996 jio_fprintf(defaultStream::error_stream(),
2997 "Invalid initial heap size: %s\n", option->optionString);
2998 describe_range_error(errcode);
2999 return JNI_EINVAL;
3000 }
3001 set_min_heap_size((uintx)long_initial_heap_size);
3002 // Currently the minimum size and the initial heap sizes are the same.
3003 // Can be overridden with -XX:InitialHeapSize.
3004 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
3005 // -Xmx
3006 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3007 julong long_max_heap_size = 0;
3008 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3009 if (errcode != arg_in_range) {
3010 jio_fprintf(defaultStream::error_stream(),
3011 "Invalid maximum heap size: %s\n", option->optionString);
3012 describe_range_error(errcode);
3013 return JNI_EINVAL;
3014 }
3015 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3016 // Xmaxf
3017 } else if (match_option(option, "-Xmaxf", &tail)) {
3018 char* err;
3019 int maxf = (int)(strtod(tail, &err) * 100);
3020 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3021 jio_fprintf(defaultStream::error_stream(),
3022 "Bad max heap free percentage size: %s\n",
3023 option->optionString);
3024 return JNI_EINVAL;
3025 } else {
3026 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3027 }
3028 // Xminf
3029 } else if (match_option(option, "-Xminf", &tail)) {
3030 char* err;
3031 int minf = (int)(strtod(tail, &err) * 100);
3032 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3033 jio_fprintf(defaultStream::error_stream(),
3034 "Bad min heap free percentage size: %s\n",
3035 option->optionString);
3036 return JNI_EINVAL;
3037 } else {
3038 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3039 }
3040 // -Xss
3041 } else if (match_option(option, "-Xss", &tail)) {
3042 julong long_ThreadStackSize = 0;
3043 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3044 if (errcode != arg_in_range) {
3045 jio_fprintf(defaultStream::error_stream(),
3046 "Invalid thread stack size: %s\n", option->optionString);
3047 describe_range_error(errcode);
3048 return JNI_EINVAL;
3049 }
3050 // Internally track ThreadStackSize in units of 1024 bytes.
3051 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3052 round_to((int)long_ThreadStackSize, K) / K);
3053 // -Xoss
3054 } else if (match_option(option, "-Xoss", &tail)) {
3055 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3056 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3057 julong long_CodeCacheExpansionSize = 0;
3058 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3059 if (errcode != arg_in_range) {
3060 jio_fprintf(defaultStream::error_stream(),
3061 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3062 os::vm_page_size()/K);
3063 return JNI_EINVAL;
3064 }
3065 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3066 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3067 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3068 julong long_ReservedCodeCacheSize = 0;
3070 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3071 if (errcode != arg_in_range) {
3072 jio_fprintf(defaultStream::error_stream(),
3073 "Invalid maximum code cache size: %s.\n", option->optionString);
3074 return JNI_EINVAL;
3075 }
3076 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3077 //-XX:IncreaseFirstTierCompileThresholdAt=
3078 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3079 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3080 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3081 jio_fprintf(defaultStream::error_stream(),
3082 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3083 option->optionString);
3084 return JNI_EINVAL;
3085 }
3086 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3087 // -green
3088 } else if (match_option(option, "-green", &tail)) {
3089 jio_fprintf(defaultStream::error_stream(),
3090 "Green threads support not available\n");
3091 return JNI_EINVAL;
3092 // -native
3093 } else if (match_option(option, "-native", &tail)) {
3094 // HotSpot always uses native threads, ignore silently for compatibility
3095 // -Xsqnopause
3096 } else if (match_option(option, "-Xsqnopause", &tail)) {
3097 // EVM option, ignore silently for compatibility
3098 // -Xrs
3099 } else if (match_option(option, "-Xrs", &tail)) {
3100 // Classic/EVM option, new functionality
3101 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3102 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3103 // change default internal VM signals used - lower case for back compat
3104 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3105 // -Xoptimize
3106 } else if (match_option(option, "-Xoptimize", &tail)) {
3107 // EVM option, ignore silently for compatibility
3108 // -Xprof
3109 } else if (match_option(option, "-Xprof", &tail)) {
3110 #if INCLUDE_FPROF
3111 _has_profile = true;
3112 #else // INCLUDE_FPROF
3113 jio_fprintf(defaultStream::error_stream(),
3114 "Flat profiling is not supported in this VM.\n");
3115 return JNI_ERR;
3116 #endif // INCLUDE_FPROF
3117 // -Xconcurrentio
3118 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3119 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3120 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3121 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3122 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3123 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3125 // -Xinternalversion
3126 } else if (match_option(option, "-Xinternalversion", &tail)) {
3127 jio_fprintf(defaultStream::output_stream(), "%s\n",
3128 VM_Version::internal_vm_info_string());
3129 vm_exit(0);
3130 #ifndef PRODUCT
3131 // -Xprintflags
3132 } else if (match_option(option, "-Xprintflags", &tail)) {
3133 CommandLineFlags::printFlags(tty, false);
3134 vm_exit(0);
3135 #endif
3136 // -D
3137 } else if (match_option(option, "-D", &tail)) {
3138 if (CheckEndorsedAndExtDirs) {
3139 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3140 // abort if -Djava.endorsed.dirs is set
3141 jio_fprintf(defaultStream::output_stream(),
3142 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3143 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3144 return JNI_EINVAL;
3145 }
3146 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3147 // abort if -Djava.ext.dirs is set
3148 jio_fprintf(defaultStream::output_stream(),
3149 "-Djava.ext.dirs will not be supported in a future release.\n"
3150 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3151 return JNI_EINVAL;
3152 }
3153 }
3155 if (!add_property(tail)) {
3156 return JNI_ENOMEM;
3157 }
3158 // Out of the box management support
3159 if (match_option(option, "-Dcom.sun.management", &tail)) {
3160 #if INCLUDE_MANAGEMENT
3161 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3162 #else
3163 jio_fprintf(defaultStream::output_stream(),
3164 "-Dcom.sun.management is not supported in this VM.\n");
3165 return JNI_ERR;
3166 #endif
3167 }
3168 // -Xint
3169 } else if (match_option(option, "-Xint", &tail)) {
3170 set_mode_flags(_int);
3171 // -Xmixed
3172 } else if (match_option(option, "-Xmixed", &tail)) {
3173 set_mode_flags(_mixed);
3174 // -Xcomp
3175 } else if (match_option(option, "-Xcomp", &tail)) {
3176 // for testing the compiler; turn off all flags that inhibit compilation
3177 set_mode_flags(_comp);
3178 // -Xshare:dump
3179 } else if (match_option(option, "-Xshare:dump", &tail)) {
3180 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3181 set_mode_flags(_int); // Prevent compilation, which creates objects
3182 // -Xshare:on
3183 } else if (match_option(option, "-Xshare:on", &tail)) {
3184 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3185 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3186 // -Xshare:auto
3187 } else if (match_option(option, "-Xshare:auto", &tail)) {
3188 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3189 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3190 // -Xshare:off
3191 } else if (match_option(option, "-Xshare:off", &tail)) {
3192 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3193 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3194 // -Xverify
3195 } else if (match_option(option, "-Xverify", &tail)) {
3196 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3197 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3198 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3199 } else if (strcmp(tail, ":remote") == 0) {
3200 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3201 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3202 } else if (strcmp(tail, ":none") == 0) {
3203 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3204 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3205 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3206 return JNI_EINVAL;
3207 }
3208 // -Xdebug
3209 } else if (match_option(option, "-Xdebug", &tail)) {
3210 // note this flag has been used, then ignore
3211 set_xdebug_mode(true);
3212 // -Xnoagent
3213 } else if (match_option(option, "-Xnoagent", &tail)) {
3214 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3215 } else if (match_option(option, "-Xboundthreads", &tail)) {
3216 // Bind user level threads to kernel threads (Solaris only)
3217 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3218 } else if (match_option(option, "-Xloggc:", &tail)) {
3219 // Redirect GC output to the file. -Xloggc:<filename>
3220 // ostream_init_log(), when called will use this filename
3221 // to initialize a fileStream.
3222 _gc_log_filename = strdup(tail);
3223 if (!is_filename_valid(_gc_log_filename)) {
3224 jio_fprintf(defaultStream::output_stream(),
3225 "Invalid file name for use with -Xloggc: Filename can only contain the "
3226 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3227 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3228 return JNI_EINVAL;
3229 }
3230 FLAG_SET_CMDLINE(bool, PrintGC, true);
3231 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3233 // JNI hooks
3234 } else if (match_option(option, "-Xcheck", &tail)) {
3235 if (!strcmp(tail, ":jni")) {
3236 #if !INCLUDE_JNI_CHECK
3237 warning("JNI CHECKING is not supported in this VM");
3238 #else
3239 CheckJNICalls = true;
3240 #endif // INCLUDE_JNI_CHECK
3241 } else if (is_bad_option(option, args->ignoreUnrecognized,
3242 "check")) {
3243 return JNI_EINVAL;
3244 }
3245 } else if (match_option(option, "vfprintf", &tail)) {
3246 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3247 } else if (match_option(option, "exit", &tail)) {
3248 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3249 } else if (match_option(option, "abort", &tail)) {
3250 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3251 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3252 // The last option must always win.
3253 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3254 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3255 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3256 // The last option must always win.
3257 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3258 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3259 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3260 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3261 jio_fprintf(defaultStream::error_stream(),
3262 "Please use CMSClassUnloadingEnabled in place of "
3263 "CMSPermGenSweepingEnabled in the future\n");
3264 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3265 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3266 jio_fprintf(defaultStream::error_stream(),
3267 "Please use -XX:+UseGCOverheadLimit in place of "
3268 "-XX:+UseGCTimeLimit in the future\n");
3269 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3270 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3271 jio_fprintf(defaultStream::error_stream(),
3272 "Please use -XX:-UseGCOverheadLimit in place of "
3273 "-XX:-UseGCTimeLimit in the future\n");
3274 // The TLE options are for compatibility with 1.3 and will be
3275 // removed without notice in a future release. These options
3276 // are not to be documented.
3277 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3278 // No longer used.
3279 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3280 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3281 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3282 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3283 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3284 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3285 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3286 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3287 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3288 // No longer used.
3289 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3290 julong long_tlab_size = 0;
3291 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3292 if (errcode != arg_in_range) {
3293 jio_fprintf(defaultStream::error_stream(),
3294 "Invalid TLAB size: %s\n", option->optionString);
3295 describe_range_error(errcode);
3296 return JNI_EINVAL;
3297 }
3298 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3299 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3300 // No longer used.
3301 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3302 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3303 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3304 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3305 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3306 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3307 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3308 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3309 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3310 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3311 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3312 #if defined(DTRACE_ENABLED)
3313 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3314 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3315 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3316 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3317 #else // defined(DTRACE_ENABLED)
3318 jio_fprintf(defaultStream::error_stream(),
3319 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3320 return JNI_EINVAL;
3321 #endif // defined(DTRACE_ENABLED)
3322 #ifdef ASSERT
3323 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3324 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3325 // disable scavenge before parallel mark-compact
3326 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3327 #endif
3328 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3329 julong cms_blocks_to_claim = (julong)atol(tail);
3330 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3331 jio_fprintf(defaultStream::error_stream(),
3332 "Please use -XX:OldPLABSize in place of "
3333 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3334 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3335 julong cms_blocks_to_claim = (julong)atol(tail);
3336 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3337 jio_fprintf(defaultStream::error_stream(),
3338 "Please use -XX:OldPLABSize in place of "
3339 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3340 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3341 julong old_plab_size = 0;
3342 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3343 if (errcode != arg_in_range) {
3344 jio_fprintf(defaultStream::error_stream(),
3345 "Invalid old PLAB size: %s\n", option->optionString);
3346 describe_range_error(errcode);
3347 return JNI_EINVAL;
3348 }
3349 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3350 jio_fprintf(defaultStream::error_stream(),
3351 "Please use -XX:OldPLABSize in place of "
3352 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3353 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3354 julong young_plab_size = 0;
3355 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3356 if (errcode != arg_in_range) {
3357 jio_fprintf(defaultStream::error_stream(),
3358 "Invalid young PLAB size: %s\n", option->optionString);
3359 describe_range_error(errcode);
3360 return JNI_EINVAL;
3361 }
3362 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3363 jio_fprintf(defaultStream::error_stream(),
3364 "Please use -XX:YoungPLABSize in place of "
3365 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3366 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3367 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3368 julong stack_size = 0;
3369 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3370 if (errcode != arg_in_range) {
3371 jio_fprintf(defaultStream::error_stream(),
3372 "Invalid mark stack size: %s\n", option->optionString);
3373 describe_range_error(errcode);
3374 return JNI_EINVAL;
3375 }
3376 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3377 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3378 julong max_stack_size = 0;
3379 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3380 if (errcode != arg_in_range) {
3381 jio_fprintf(defaultStream::error_stream(),
3382 "Invalid maximum mark stack size: %s\n",
3383 option->optionString);
3384 describe_range_error(errcode);
3385 return JNI_EINVAL;
3386 }
3387 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3388 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3389 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3390 uintx conc_threads = 0;
3391 if (!parse_uintx(tail, &conc_threads, 1)) {
3392 jio_fprintf(defaultStream::error_stream(),
3393 "Invalid concurrent threads: %s\n", option->optionString);
3394 return JNI_EINVAL;
3395 }
3396 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3397 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3398 julong max_direct_memory_size = 0;
3399 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3400 if (errcode != arg_in_range) {
3401 jio_fprintf(defaultStream::error_stream(),
3402 "Invalid maximum direct memory size: %s\n",
3403 option->optionString);
3404 describe_range_error(errcode);
3405 return JNI_EINVAL;
3406 }
3407 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3408 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3409 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3410 // away and will cause VM initialization failures!
3411 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3412 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3413 #if !INCLUDE_MANAGEMENT
3414 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3415 jio_fprintf(defaultStream::error_stream(),
3416 "ManagementServer is not supported in this VM.\n");
3417 return JNI_ERR;
3418 #endif // INCLUDE_MANAGEMENT
3419 #if INCLUDE_JFR
3420 } else if (match_jfr_option(&option)) {
3421 return JNI_EINVAL;
3422 #endif
3423 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3424 // Skip -XX:Flags= since that case has already been handled
3425 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3426 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3427 return JNI_EINVAL;
3428 }
3429 }
3430 // Unknown option
3431 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3432 return JNI_ERR;
3433 }
3434 }
3436 // PrintSharedArchiveAndExit will turn on
3437 // -Xshare:on
3438 // -XX:+TraceClassPaths
3439 if (PrintSharedArchiveAndExit) {
3440 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3441 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3442 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3443 }
3445 // Change the default value for flags which have different default values
3446 // when working with older JDKs.
3447 #ifdef LINUX
3448 if (JDK_Version::current().compare_major(6) <= 0 &&
3449 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3450 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3451 }
3452 #endif // LINUX
3453 fix_appclasspath();
3454 return JNI_OK;
3455 }
3457 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3458 //
3459 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3460 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3461 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3462 // path is treated as the current directory.
3463 //
3464 // This causes problems with CDS, which requires that all directories specified in the classpath
3465 // must be empty. In most cases, applications do NOT want to load classes from the current
3466 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3467 // scripts compatible with CDS.
3468 void Arguments::fix_appclasspath() {
3469 if (IgnoreEmptyClassPaths) {
3470 const char separator = *os::path_separator();
3471 const char* src = _java_class_path->value();
3473 // skip over all the leading empty paths
3474 while (*src == separator) {
3475 src ++;
3476 }
3478 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3479 strncpy(copy, src, strlen(src) + 1);
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 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3859 file_sep_len + 20, mtInternal);
3860 if (shared_archive_path != NULL) {
3861 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3862 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3863 strncat(shared_archive_path, "classes.jsa", 11);
3864 }
3865 } else {
3866 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3867 if (shared_archive_path != NULL) {
3868 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3869 }
3870 }
3871 return shared_archive_path;
3872 }
3874 #ifndef PRODUCT
3875 // Determine whether LogVMOutput should be implicitly turned on.
3876 static bool use_vm_log() {
3877 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3878 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3879 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3880 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3881 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3882 return true;
3883 }
3885 #ifdef COMPILER1
3886 if (PrintC1Statistics) {
3887 return true;
3888 }
3889 #endif // COMPILER1
3891 #ifdef COMPILER2
3892 if (PrintOptoAssembly || PrintOptoStatistics) {
3893 return true;
3894 }
3895 #endif // COMPILER2
3897 return false;
3898 }
3899 #endif // PRODUCT
3901 // Parse entry point called from JNI_CreateJavaVM
3903 jint Arguments::parse(const JavaVMInitArgs* args) {
3905 // Remaining part of option string
3906 const char* tail;
3908 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3909 const char* hotspotrc = ".hotspotrc";
3910 bool settings_file_specified = false;
3911 bool needs_hotspotrc_warning = false;
3913 ArgumentsExt::process_options(args);
3915 const char* flags_file;
3916 int index;
3917 for (index = 0; index < args->nOptions; index++) {
3918 const JavaVMOption *option = args->options + index;
3919 if (match_option(option, "-XX:Flags=", &tail)) {
3920 flags_file = tail;
3921 settings_file_specified = true;
3922 }
3923 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3924 PrintVMOptions = true;
3925 }
3926 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3927 PrintVMOptions = false;
3928 }
3929 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3930 IgnoreUnrecognizedVMOptions = true;
3931 }
3932 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3933 IgnoreUnrecognizedVMOptions = false;
3934 }
3935 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3936 CommandLineFlags::printFlags(tty, false);
3937 vm_exit(0);
3938 }
3939 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3940 #if INCLUDE_NMT
3941 // The launcher did not setup nmt environment variable properly.
3942 if (!MemTracker::check_launcher_nmt_support(tail)) {
3943 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3944 }
3946 // Verify if nmt option is valid.
3947 if (MemTracker::verify_nmt_option()) {
3948 // Late initialization, still in single-threaded mode.
3949 if (MemTracker::tracking_level() >= NMT_summary) {
3950 MemTracker::init();
3951 }
3952 } else {
3953 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3954 }
3955 #else
3956 jio_fprintf(defaultStream::error_stream(),
3957 "Native Memory Tracking is not supported in this VM\n");
3958 return JNI_ERR;
3959 #endif
3960 }
3963 #ifndef PRODUCT
3964 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3965 CommandLineFlags::printFlags(tty, true);
3966 vm_exit(0);
3967 }
3968 #endif
3969 }
3971 if (IgnoreUnrecognizedVMOptions) {
3972 // uncast const to modify the flag args->ignoreUnrecognized
3973 *(jboolean*)(&args->ignoreUnrecognized) = true;
3974 }
3976 // Parse specified settings file
3977 if (settings_file_specified) {
3978 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3979 return JNI_EINVAL;
3980 }
3981 } else {
3982 #ifdef ASSERT
3983 // Parse default .hotspotrc settings file
3984 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3985 return JNI_EINVAL;
3986 }
3987 #else
3988 struct stat buf;
3989 if (os::stat(hotspotrc, &buf) == 0) {
3990 needs_hotspotrc_warning = true;
3991 }
3992 #endif
3993 }
3995 if (PrintVMOptions) {
3996 for (index = 0; index < args->nOptions; index++) {
3997 const JavaVMOption *option = args->options + index;
3998 if (match_option(option, "-XX:", &tail)) {
3999 logOption(tail);
4000 }
4001 }
4002 }
4004 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4005 jint result = parse_vm_init_args(args);
4006 if (result != JNI_OK) {
4007 return result;
4008 }
4010 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4011 SharedArchivePath = get_shared_archive_path();
4012 if (SharedArchivePath == NULL) {
4013 return JNI_ENOMEM;
4014 }
4016 // Set up VerifySharedSpaces
4017 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4018 VerifySharedSpaces = true;
4019 }
4021 // Delay warning until here so that we've had a chance to process
4022 // the -XX:-PrintWarnings flag
4023 if (needs_hotspotrc_warning) {
4024 warning("%s file is present but has been ignored. "
4025 "Run with -XX:Flags=%s to load the file.",
4026 hotspotrc, hotspotrc);
4027 }
4029 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
4030 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4031 #endif
4033 #if INCLUDE_ALL_GCS
4034 #if (defined JAVASE_EMBEDDED || defined ARM)
4035 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4036 #endif
4037 #endif
4039 #ifndef PRODUCT
4040 if (TraceBytecodesAt != 0) {
4041 TraceBytecodes = true;
4042 }
4043 if (CountCompiledCalls) {
4044 if (UseCounterDecay) {
4045 warning("UseCounterDecay disabled because CountCalls is set");
4046 UseCounterDecay = false;
4047 }
4048 }
4049 #endif // PRODUCT
4051 // JSR 292 is not supported before 1.7
4052 if (!JDK_Version::is_gte_jdk17x_version()) {
4053 if (EnableInvokeDynamic) {
4054 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4055 warning("JSR 292 is not supported before 1.7. Disabling support.");
4056 }
4057 EnableInvokeDynamic = false;
4058 }
4059 }
4061 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4062 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4063 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4064 }
4065 ScavengeRootsInCode = 1;
4066 }
4068 if (PrintGCDetails) {
4069 // Turn on -verbose:gc options as well
4070 PrintGC = true;
4071 }
4073 if (!JDK_Version::is_gte_jdk18x_version()) {
4074 // To avoid changing the log format for 7 updates this flag is only
4075 // true by default in JDK8 and above.
4076 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4077 FLAG_SET_DEFAULT(PrintGCCause, false);
4078 }
4079 }
4081 // Set object alignment values.
4082 set_object_alignment();
4084 #if !INCLUDE_ALL_GCS
4085 force_serial_gc();
4086 #endif // INCLUDE_ALL_GCS
4087 #if !INCLUDE_CDS
4088 if (DumpSharedSpaces || RequireSharedSpaces) {
4089 jio_fprintf(defaultStream::error_stream(),
4090 "Shared spaces are not supported in this VM\n");
4091 return JNI_ERR;
4092 }
4093 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4094 warning("Shared spaces are not supported in this VM");
4095 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4096 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4097 }
4098 no_shared_spaces("CDS Disabled");
4099 #endif // INCLUDE_CDS
4101 return JNI_OK;
4102 }
4104 jint Arguments::apply_ergo() {
4106 // Set flags based on ergonomics.
4107 set_ergonomics_flags();
4109 set_shared_spaces_flags();
4111 #if defined(SPARC)
4112 // BIS instructions require 'membar' instruction regardless of the number
4113 // of CPUs because in virtualized/container environments which might use only 1
4114 // CPU, BIS instructions may produce incorrect results.
4116 if (FLAG_IS_DEFAULT(AssumeMP)) {
4117 FLAG_SET_DEFAULT(AssumeMP, true);
4118 }
4119 #endif
4121 // Check the GC selections again.
4122 if (!check_gc_consistency()) {
4123 return JNI_EINVAL;
4124 }
4126 if (TieredCompilation) {
4127 set_tiered_flags();
4128 } else {
4129 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4130 if (CompilationPolicyChoice >= 2) {
4131 vm_exit_during_initialization(
4132 "Incompatible compilation policy selected", NULL);
4133 }
4134 }
4135 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4136 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4137 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4138 }
4141 // Set heap size based on available physical memory
4142 set_heap_size();
4144 ArgumentsExt::set_gc_specific_flags();
4146 // Initialize Metaspace flags and alignments.
4147 Metaspace::ergo_initialize();
4149 // Set bytecode rewriting flags
4150 set_bytecode_flags();
4152 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4153 set_aggressive_opts_flags();
4155 // Turn off biased locking for locking debug mode flags,
4156 // which are subtlely different from each other but neither works with
4157 // biased locking.
4158 if (UseHeavyMonitors
4159 #ifdef COMPILER1
4160 || !UseFastLocking
4161 #endif // COMPILER1
4162 ) {
4163 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4164 // flag set to true on command line; warn the user that they
4165 // can't enable biased locking here
4166 warning("Biased Locking is not supported with locking debug flags"
4167 "; ignoring UseBiasedLocking flag." );
4168 }
4169 UseBiasedLocking = false;
4170 }
4172 #ifdef ZERO
4173 // Clear flags not supported on zero.
4174 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4175 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4176 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4177 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4178 #endif // CC_INTERP
4180 #ifdef COMPILER2
4181 if (!EliminateLocks) {
4182 EliminateNestedLocks = false;
4183 }
4184 if (!Inline) {
4185 IncrementalInline = false;
4186 }
4187 #ifndef PRODUCT
4188 if (!IncrementalInline) {
4189 AlwaysIncrementalInline = false;
4190 }
4191 #endif
4192 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4193 // incremental inlining: bump MaxNodeLimit
4194 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4195 }
4196 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4197 // nothing to use the profiling, turn if off
4198 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4199 }
4200 #endif
4202 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4203 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4204 DebugNonSafepoints = true;
4205 }
4207 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4208 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4209 }
4211 if (UseOnStackReplacement && !UseLoopCounter) {
4212 warning("On-stack-replacement requires loop counters; enabling loop counters");
4213 FLAG_SET_DEFAULT(UseLoopCounter, true);
4214 }
4216 #ifndef PRODUCT
4217 if (CompileTheWorld) {
4218 // Force NmethodSweeper to sweep whole CodeCache each time.
4219 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4220 NmethodSweepFraction = 1;
4221 }
4222 }
4224 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4225 if (use_vm_log()) {
4226 LogVMOutput = true;
4227 }
4228 }
4229 #endif // PRODUCT
4231 if (PrintCommandLineFlags) {
4232 CommandLineFlags::printSetFlags(tty);
4233 }
4235 // Apply CPU specific policy for the BiasedLocking
4236 if (UseBiasedLocking) {
4237 if (!VM_Version::use_biased_locking() &&
4238 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4239 UseBiasedLocking = false;
4240 }
4241 }
4242 #ifdef COMPILER2
4243 if (!UseBiasedLocking || EmitSync != 0) {
4244 UseOptoBiasInlining = false;
4245 }
4246 #endif
4248 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4249 // but only if not already set on the commandline
4250 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4251 bool set = false;
4252 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4253 if (!set) {
4254 FLAG_SET_DEFAULT(PauseAtExit, true);
4255 }
4256 }
4258 return JNI_OK;
4259 }
4261 jint Arguments::adjust_after_os() {
4262 if (UseNUMA) {
4263 if (UseParallelGC || UseParallelOldGC) {
4264 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4265 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4266 }
4267 }
4268 // UseNUMAInterleaving is set to ON for all collectors and
4269 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4270 // such as the parallel collector for Linux and Solaris will
4271 // interleave old gen and survivor spaces on top of NUMA
4272 // allocation policy for the eden space.
4273 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4274 // all platforms and ParallelGC on Windows will interleave all
4275 // of the heap spaces across NUMA nodes.
4276 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4277 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4278 }
4279 }
4280 return JNI_OK;
4281 }
4283 int Arguments::PropertyList_count(SystemProperty* pl) {
4284 int count = 0;
4285 while(pl != NULL) {
4286 count++;
4287 pl = pl->next();
4288 }
4289 return count;
4290 }
4292 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4293 assert(key != NULL, "just checking");
4294 SystemProperty* prop;
4295 for (prop = pl; prop != NULL; prop = prop->next()) {
4296 if (strcmp(key, prop->key()) == 0) return prop->value();
4297 }
4298 return NULL;
4299 }
4301 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4302 int count = 0;
4303 const char* ret_val = NULL;
4305 while(pl != NULL) {
4306 if(count >= index) {
4307 ret_val = pl->key();
4308 break;
4309 }
4310 count++;
4311 pl = pl->next();
4312 }
4314 return ret_val;
4315 }
4317 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4318 int count = 0;
4319 char* ret_val = NULL;
4321 while(pl != NULL) {
4322 if(count >= index) {
4323 ret_val = pl->value();
4324 break;
4325 }
4326 count++;
4327 pl = pl->next();
4328 }
4330 return ret_val;
4331 }
4333 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4334 SystemProperty* p = *plist;
4335 if (p == NULL) {
4336 *plist = new_p;
4337 } else {
4338 while (p->next() != NULL) {
4339 p = p->next();
4340 }
4341 p->set_next(new_p);
4342 }
4343 }
4345 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4346 if (plist == NULL)
4347 return;
4349 SystemProperty* new_p = new SystemProperty(k, v, true);
4350 PropertyList_add(plist, new_p);
4351 }
4353 // This add maintains unique property key in the list.
4354 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4355 if (plist == NULL)
4356 return;
4358 // If property key exist then update with new value.
4359 SystemProperty* prop;
4360 for (prop = *plist; prop != NULL; prop = prop->next()) {
4361 if (strcmp(k, prop->key()) == 0) {
4362 if (append) {
4363 prop->append_value(v);
4364 } else {
4365 prop->set_value(v);
4366 }
4367 return;
4368 }
4369 }
4371 PropertyList_add(plist, k, v);
4372 }
4374 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4375 // Returns true if all of the source pointed by src has been copied over to
4376 // the destination buffer pointed by buf. Otherwise, returns false.
4377 // Notes:
4378 // 1. If the length (buflen) of the destination buffer excluding the
4379 // NULL terminator character is not long enough for holding the expanded
4380 // pid characters, it also returns false instead of returning the partially
4381 // expanded one.
4382 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4383 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4384 char* buf, size_t buflen) {
4385 const char* p = src;
4386 char* b = buf;
4387 const char* src_end = &src[srclen];
4388 char* buf_end = &buf[buflen - 1];
4390 while (p < src_end && b < buf_end) {
4391 if (*p == '%') {
4392 switch (*(++p)) {
4393 case '%': // "%%" ==> "%"
4394 *b++ = *p++;
4395 break;
4396 case 'p': { // "%p" ==> current process id
4397 // buf_end points to the character before the last character so
4398 // that we could write '\0' to the end of the buffer.
4399 size_t buf_sz = buf_end - b + 1;
4400 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4402 // if jio_snprintf fails or the buffer is not long enough to hold
4403 // the expanded pid, returns false.
4404 if (ret < 0 || ret >= (int)buf_sz) {
4405 return false;
4406 } else {
4407 b += ret;
4408 assert(*b == '\0', "fail in copy_expand_pid");
4409 if (p == src_end && b == buf_end + 1) {
4410 // reach the end of the buffer.
4411 return true;
4412 }
4413 }
4414 p++;
4415 break;
4416 }
4417 default :
4418 *b++ = '%';
4419 }
4420 } else {
4421 *b++ = *p++;
4422 }
4423 }
4424 *b = '\0';
4425 return (p == src_end); // return false if not all of the source was copied
4426 }