Tue, 18 Mar 2014 19:07:22 +0100
8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp
1 /*
2 * Copyright (c) 1997, 2013, 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/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/genCollectedHeap.hpp"
32 #include "memory/referenceProcessor.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/java.hpp"
39 #include "services/management.hpp"
40 #include "services/memTracker.hpp"
41 #include "utilities/defaultStream.hpp"
42 #include "utilities/macros.hpp"
43 #include "utilities/taskqueue.hpp"
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "os_linux.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "os_solaris.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "os_windows.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_bsd
54 # include "os_bsd.inline.hpp"
55 #endif
56 #if INCLUDE_ALL_GCS
57 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
58 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
59 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
60 #endif // INCLUDE_ALL_GCS
62 // Note: This is a special bug reporting site for the JVM
63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
64 #define DEFAULT_JAVA_LAUNCHER "generic"
66 // Disable options not supported in this release, with a warning if they
67 // were explicitly requested on the command-line
68 #define UNSUPPORTED_OPTION(opt, description) \
69 do { \
70 if (opt) { \
71 if (FLAG_IS_CMDLINE(opt)) { \
72 warning(description " is disabled in this release."); \
73 } \
74 FLAG_SET_DEFAULT(opt, false); \
75 } \
76 } while(0)
78 #define UNSUPPORTED_GC_OPTION(gc) \
79 do { \
80 if (gc) { \
81 if (FLAG_IS_CMDLINE(gc)) { \
82 warning(#gc " is not supported in this VM. Using Serial GC."); \
83 } \
84 FLAG_SET_DEFAULT(gc, false); \
85 } \
86 } while(0)
88 char** Arguments::_jvm_flags_array = NULL;
89 int Arguments::_num_jvm_flags = 0;
90 char** Arguments::_jvm_args_array = NULL;
91 int Arguments::_num_jvm_args = 0;
92 char* Arguments::_java_command = NULL;
93 SystemProperty* Arguments::_system_properties = NULL;
94 const char* Arguments::_gc_log_filename = NULL;
95 bool Arguments::_has_profile = false;
96 size_t Arguments::_conservative_max_heap_alignment = 0;
97 uintx Arguments::_min_heap_size = 0;
98 Arguments::Mode Arguments::_mode = _mixed;
99 bool Arguments::_java_compiler = false;
100 bool Arguments::_xdebug_mode = false;
101 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
102 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
103 int Arguments::_sun_java_launcher_pid = -1;
104 bool Arguments::_created_by_gamma_launcher = false;
106 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
107 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
108 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
109 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
110 bool Arguments::_ClipInlining = ClipInlining;
112 char* Arguments::SharedArchivePath = NULL;
114 AgentLibraryList Arguments::_libraryList;
115 AgentLibraryList Arguments::_agentList;
117 abort_hook_t Arguments::_abort_hook = NULL;
118 exit_hook_t Arguments::_exit_hook = NULL;
119 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
122 SystemProperty *Arguments::_java_ext_dirs = NULL;
123 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
124 SystemProperty *Arguments::_sun_boot_library_path = NULL;
125 SystemProperty *Arguments::_java_library_path = NULL;
126 SystemProperty *Arguments::_java_home = NULL;
127 SystemProperty *Arguments::_java_class_path = NULL;
128 SystemProperty *Arguments::_sun_boot_class_path = NULL;
130 char* Arguments::_meta_index_path = NULL;
131 char* Arguments::_meta_index_dir = NULL;
133 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
135 static bool match_option(const JavaVMOption *option, const char* name,
136 const char** tail) {
137 int len = (int)strlen(name);
138 if (strncmp(option->optionString, name, len) == 0) {
139 *tail = option->optionString + len;
140 return true;
141 } else {
142 return false;
143 }
144 }
146 static void logOption(const char* opt) {
147 if (PrintVMOptions) {
148 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
149 }
150 }
152 // Process java launcher properties.
153 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
154 // See if sun.java.launcher or sun.java.launcher.pid is defined.
155 // Must do this before setting up other system properties,
156 // as some of them may depend on launcher type.
157 for (int index = 0; index < args->nOptions; index++) {
158 const JavaVMOption* option = args->options + index;
159 const char* tail;
161 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
162 process_java_launcher_argument(tail, option->extraInfo);
163 continue;
164 }
165 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
166 _sun_java_launcher_pid = atoi(tail);
167 continue;
168 }
169 }
170 }
172 // Initialize system properties key and value.
173 void Arguments::init_system_properties() {
175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
176 "Java Virtual Machine Specification", false));
177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
179 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
181 // following are JVMTI agent writeable properties.
182 // Properties values are set to NULL and they are
183 // os specific they are initialized in os::init_system_properties_values().
184 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
185 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
186 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
187 _java_library_path = new SystemProperty("java.library.path", NULL, true);
188 _java_home = new SystemProperty("java.home", NULL, true);
189 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
191 _java_class_path = new SystemProperty("java.class.path", "", true);
193 // Add to System Property list.
194 PropertyList_add(&_system_properties, _java_ext_dirs);
195 PropertyList_add(&_system_properties, _java_endorsed_dirs);
196 PropertyList_add(&_system_properties, _sun_boot_library_path);
197 PropertyList_add(&_system_properties, _java_library_path);
198 PropertyList_add(&_system_properties, _java_home);
199 PropertyList_add(&_system_properties, _java_class_path);
200 PropertyList_add(&_system_properties, _sun_boot_class_path);
202 // Set OS specific system properties values
203 os::init_system_properties_values();
204 }
207 // Update/Initialize System properties after JDK version number is known
208 void Arguments::init_version_specific_system_properties() {
209 enum { bufsz = 16 };
210 char buffer[bufsz];
211 const char* spec_vendor = "Sun Microsystems Inc.";
212 uint32_t spec_version = 0;
214 if (JDK_Version::is_gte_jdk17x_version()) {
215 spec_vendor = "Oracle Corporation";
216 spec_version = JDK_Version::current().major_version();
217 }
218 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
220 PropertyList_add(&_system_properties,
221 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
222 PropertyList_add(&_system_properties,
223 new SystemProperty("java.vm.specification.version", buffer, false));
224 PropertyList_add(&_system_properties,
225 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
226 }
228 /**
229 * Provide a slightly more user-friendly way of eliminating -XX flags.
230 * When a flag is eliminated, it can be added to this list in order to
231 * continue accepting this flag on the command-line, while issuing a warning
232 * and ignoring the value. Once the JDK version reaches the 'accept_until'
233 * limit, we flatly refuse to admit the existence of the flag. This allows
234 * a flag to die correctly over JDK releases using HSX.
235 */
236 typedef struct {
237 const char* name;
238 JDK_Version obsoleted_in; // when the flag went away
239 JDK_Version accept_until; // which version to start denying the existence
240 } ObsoleteFlag;
242 static ObsoleteFlag obsolete_jvm_flags[] = {
243 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
244 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
257 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
258 { "DefaultInitialRAMFraction",
259 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
260 { "UseDepthFirstScavengeOrder",
261 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
262 { "HandlePromotionFailure",
263 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
264 { "MaxLiveObjectEvacuationRatio",
265 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
266 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
267 { "UseParallelOldGCCompacting",
268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
269 { "UseParallelDensePrefixUpdate",
270 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
271 { "UseParallelOldGCDensePrefix",
272 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
273 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
274 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
275 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
276 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
294 #ifdef PRODUCT
295 { "DesiredMethodLimit",
296 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
297 #endif // PRODUCT
298 { NULL, JDK_Version(0), JDK_Version(0) }
299 };
301 // Returns true if the flag is obsolete and fits into the range specified
302 // for being ignored. In the case that the flag is ignored, the 'version'
303 // value is filled in with the version number when the flag became
304 // obsolete so that that value can be displayed to the user.
305 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
306 int i = 0;
307 assert(version != NULL, "Must provide a version buffer");
308 while (obsolete_jvm_flags[i].name != NULL) {
309 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
310 // <flag>=xxx form
311 // [-|+]<flag> form
312 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
313 ((s[0] == '+' || s[0] == '-') &&
314 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
315 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
316 *version = flag_status.obsoleted_in;
317 return true;
318 }
319 }
320 i++;
321 }
322 return false;
323 }
325 // Constructs the system class path (aka boot class path) from the following
326 // components, in order:
327 //
328 // prefix // from -Xbootclasspath/p:...
329 // endorsed // the expansion of -Djava.endorsed.dirs=...
330 // base // from os::get_system_properties() or -Xbootclasspath=
331 // suffix // from -Xbootclasspath/a:...
332 //
333 // java.endorsed.dirs is a list of directories; any jar or zip files in the
334 // directories are added to the sysclasspath just before the base.
335 //
336 // This could be AllStatic, but it isn't needed after argument processing is
337 // complete.
338 class SysClassPath: public StackObj {
339 public:
340 SysClassPath(const char* base);
341 ~SysClassPath();
343 inline void set_base(const char* base);
344 inline void add_prefix(const char* prefix);
345 inline void add_suffix_to_prefix(const char* suffix);
346 inline void add_suffix(const char* suffix);
347 inline void reset_path(const char* base);
349 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
350 // property. Must be called after all command-line arguments have been
351 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
352 // combined_path().
353 void expand_endorsed();
355 inline const char* get_base() const { return _items[_scp_base]; }
356 inline const char* get_prefix() const { return _items[_scp_prefix]; }
357 inline const char* get_suffix() const { return _items[_scp_suffix]; }
358 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
360 // Combine all the components into a single c-heap-allocated string; caller
361 // must free the string if/when no longer needed.
362 char* combined_path();
364 private:
365 // Utility routines.
366 static char* add_to_path(const char* path, const char* str, bool prepend);
367 static char* add_jars_to_path(char* path, const char* directory);
369 inline void reset_item_at(int index);
371 // Array indices for the items that make up the sysclasspath. All except the
372 // base are allocated in the C heap and freed by this class.
373 enum {
374 _scp_prefix, // from -Xbootclasspath/p:...
375 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
376 _scp_base, // the default sysclasspath
377 _scp_suffix, // from -Xbootclasspath/a:...
378 _scp_nitems // the number of items, must be last.
379 };
381 const char* _items[_scp_nitems];
382 DEBUG_ONLY(bool _expansion_done;)
383 };
385 SysClassPath::SysClassPath(const char* base) {
386 memset(_items, 0, sizeof(_items));
387 _items[_scp_base] = base;
388 DEBUG_ONLY(_expansion_done = false;)
389 }
391 SysClassPath::~SysClassPath() {
392 // Free everything except the base.
393 for (int i = 0; i < _scp_nitems; ++i) {
394 if (i != _scp_base) reset_item_at(i);
395 }
396 DEBUG_ONLY(_expansion_done = false;)
397 }
399 inline void SysClassPath::set_base(const char* base) {
400 _items[_scp_base] = base;
401 }
403 inline void SysClassPath::add_prefix(const char* prefix) {
404 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
405 }
407 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
408 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
409 }
411 inline void SysClassPath::add_suffix(const char* suffix) {
412 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
413 }
415 inline void SysClassPath::reset_item_at(int index) {
416 assert(index < _scp_nitems && index != _scp_base, "just checking");
417 if (_items[index] != NULL) {
418 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
419 _items[index] = NULL;
420 }
421 }
423 inline void SysClassPath::reset_path(const char* base) {
424 // Clear the prefix and suffix.
425 reset_item_at(_scp_prefix);
426 reset_item_at(_scp_suffix);
427 set_base(base);
428 }
430 //------------------------------------------------------------------------------
432 void SysClassPath::expand_endorsed() {
433 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
435 const char* path = Arguments::get_property("java.endorsed.dirs");
436 if (path == NULL) {
437 path = Arguments::get_endorsed_dir();
438 assert(path != NULL, "no default for java.endorsed.dirs");
439 }
441 char* expanded_path = NULL;
442 const char separator = *os::path_separator();
443 const char* const end = path + strlen(path);
444 while (path < end) {
445 const char* tmp_end = strchr(path, separator);
446 if (tmp_end == NULL) {
447 expanded_path = add_jars_to_path(expanded_path, path);
448 path = end;
449 } else {
450 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
451 memcpy(dirpath, path, tmp_end - path);
452 dirpath[tmp_end - path] = '\0';
453 expanded_path = add_jars_to_path(expanded_path, dirpath);
454 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
455 path = tmp_end + 1;
456 }
457 }
458 _items[_scp_endorsed] = expanded_path;
459 DEBUG_ONLY(_expansion_done = true;)
460 }
462 // Combine the bootclasspath elements, some of which may be null, into a single
463 // c-heap-allocated string.
464 char* SysClassPath::combined_path() {
465 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
466 assert(_expansion_done, "must call expand_endorsed() first.");
468 size_t lengths[_scp_nitems];
469 size_t total_len = 0;
471 const char separator = *os::path_separator();
473 // Get the lengths.
474 int i;
475 for (i = 0; i < _scp_nitems; ++i) {
476 if (_items[i] != NULL) {
477 lengths[i] = strlen(_items[i]);
478 // Include space for the separator char (or a NULL for the last item).
479 total_len += lengths[i] + 1;
480 }
481 }
482 assert(total_len > 0, "empty sysclasspath not allowed");
484 // Copy the _items to a single string.
485 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
486 char* cp_tmp = cp;
487 for (i = 0; i < _scp_nitems; ++i) {
488 if (_items[i] != NULL) {
489 memcpy(cp_tmp, _items[i], lengths[i]);
490 cp_tmp += lengths[i];
491 *cp_tmp++ = separator;
492 }
493 }
494 *--cp_tmp = '\0'; // Replace the extra separator.
495 return cp;
496 }
498 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
499 char*
500 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
501 char *cp;
503 assert(str != NULL, "just checking");
504 if (path == NULL) {
505 size_t len = strlen(str) + 1;
506 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
507 memcpy(cp, str, len); // copy the trailing null
508 } else {
509 const char separator = *os::path_separator();
510 size_t old_len = strlen(path);
511 size_t str_len = strlen(str);
512 size_t len = old_len + str_len + 2;
514 if (prepend) {
515 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
516 char* cp_tmp = cp;
517 memcpy(cp_tmp, str, str_len);
518 cp_tmp += str_len;
519 *cp_tmp = separator;
520 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
521 FREE_C_HEAP_ARRAY(char, path, mtInternal);
522 } else {
523 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
524 char* cp_tmp = cp + old_len;
525 *cp_tmp = separator;
526 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
527 }
528 }
529 return cp;
530 }
532 // Scan the directory and append any jar or zip files found to path.
533 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
534 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
535 DIR* dir = os::opendir(directory);
536 if (dir == NULL) return path;
538 char dir_sep[2] = { '\0', '\0' };
539 size_t directory_len = strlen(directory);
540 const char fileSep = *os::file_separator();
541 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
543 /* Scan the directory for jars/zips, appending them to path. */
544 struct dirent *entry;
545 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
546 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
547 const char* name = entry->d_name;
548 const char* ext = name + strlen(name) - 4;
549 bool isJarOrZip = ext > name &&
550 (os::file_name_strcmp(ext, ".jar") == 0 ||
551 os::file_name_strcmp(ext, ".zip") == 0);
552 if (isJarOrZip) {
553 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
554 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
555 path = add_to_path(path, jarpath, false);
556 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
557 }
558 }
559 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
560 os::closedir(dir);
561 return path;
562 }
564 // Parses a memory size specification string.
565 static bool atomull(const char *s, julong* result) {
566 julong n = 0;
567 int args_read = sscanf(s, JULONG_FORMAT, &n);
568 if (args_read != 1) {
569 return false;
570 }
571 while (*s != '\0' && isdigit(*s)) {
572 s++;
573 }
574 // 4705540: illegal if more characters are found after the first non-digit
575 if (strlen(s) > 1) {
576 return false;
577 }
578 switch (*s) {
579 case 'T': case 't':
580 *result = n * G * K;
581 // Check for overflow.
582 if (*result/((julong)G * K) != n) return false;
583 return true;
584 case 'G': case 'g':
585 *result = n * G;
586 if (*result/G != n) return false;
587 return true;
588 case 'M': case 'm':
589 *result = n * M;
590 if (*result/M != n) return false;
591 return true;
592 case 'K': case 'k':
593 *result = n * K;
594 if (*result/K != n) return false;
595 return true;
596 case '\0':
597 *result = n;
598 return true;
599 default:
600 return false;
601 }
602 }
604 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
605 if (size < min_size) return arg_too_small;
606 // Check that size will fit in a size_t (only relevant on 32-bit)
607 if (size > max_uintx) return arg_too_big;
608 return arg_in_range;
609 }
611 // Describe an argument out of range error
612 void Arguments::describe_range_error(ArgsRange errcode) {
613 switch(errcode) {
614 case arg_too_big:
615 jio_fprintf(defaultStream::error_stream(),
616 "The specified size exceeds the maximum "
617 "representable size.\n");
618 break;
619 case arg_too_small:
620 case arg_unreadable:
621 case arg_in_range:
622 // do nothing for now
623 break;
624 default:
625 ShouldNotReachHere();
626 }
627 }
629 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
630 return CommandLineFlags::boolAtPut(name, &value, origin);
631 }
633 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
634 double v;
635 if (sscanf(value, "%lf", &v) != 1) {
636 return false;
637 }
639 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
640 return true;
641 }
642 return false;
643 }
645 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
646 julong v;
647 intx intx_v;
648 bool is_neg = false;
649 // Check the sign first since atomull() parses only unsigned values.
650 if (*value == '-') {
651 if (!CommandLineFlags::intxAt(name, &intx_v)) {
652 return false;
653 }
654 value++;
655 is_neg = true;
656 }
657 if (!atomull(value, &v)) {
658 return false;
659 }
660 intx_v = (intx) v;
661 if (is_neg) {
662 intx_v = -intx_v;
663 }
664 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
665 return true;
666 }
667 uintx uintx_v = (uintx) v;
668 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
669 return true;
670 }
671 uint64_t uint64_t_v = (uint64_t) v;
672 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
673 return true;
674 }
675 return false;
676 }
678 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
679 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
680 // Contract: CommandLineFlags always returns a pointer that needs freeing.
681 FREE_C_HEAP_ARRAY(char, value, mtInternal);
682 return true;
683 }
685 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
686 const char* old_value = "";
687 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
688 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
689 size_t new_len = strlen(new_value);
690 const char* value;
691 char* free_this_too = NULL;
692 if (old_len == 0) {
693 value = new_value;
694 } else if (new_len == 0) {
695 value = old_value;
696 } else {
697 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
698 // each new setting adds another LINE to the switch:
699 sprintf(buf, "%s\n%s", old_value, new_value);
700 value = buf;
701 free_this_too = buf;
702 }
703 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
704 // CommandLineFlags always returns a pointer that needs freeing.
705 FREE_C_HEAP_ARRAY(char, value, mtInternal);
706 if (free_this_too != NULL) {
707 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
708 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
709 }
710 return true;
711 }
713 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
715 // range of acceptable characters spelled out for portability reasons
716 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
717 #define BUFLEN 255
718 char name[BUFLEN+1];
719 char dummy;
721 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
722 return set_bool_flag(name, false, origin);
723 }
724 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
725 return set_bool_flag(name, true, origin);
726 }
728 char punct;
729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
730 const char* value = strchr(arg, '=') + 1;
731 Flag* flag = Flag::find_flag(name, strlen(name));
732 if (flag != NULL && flag->is_ccstr()) {
733 if (flag->ccstr_accumulates()) {
734 return append_to_string_flag(name, value, origin);
735 } else {
736 if (value[0] == '\0') {
737 value = NULL;
738 }
739 return set_string_flag(name, value, origin);
740 }
741 }
742 }
744 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
745 const char* value = strchr(arg, '=') + 1;
746 // -XX:Foo:=xxx will reset the string flag to the given value.
747 if (value[0] == '\0') {
748 value = NULL;
749 }
750 return set_string_flag(name, value, origin);
751 }
753 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
754 #define SIGNED_NUMBER_RANGE "[-0123456789]"
755 #define NUMBER_RANGE "[0123456789]"
756 char value[BUFLEN + 1];
757 char value2[BUFLEN + 1];
758 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
759 // Looks like a floating-point number -- try again with more lenient format string
760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
761 return set_fp_numeric_flag(name, value, origin);
762 }
763 }
765 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
766 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
767 return set_numeric_flag(name, value, origin);
768 }
770 return false;
771 }
773 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
774 assert(bldarray != NULL, "illegal argument");
776 if (arg == NULL) {
777 return;
778 }
780 int new_count = *count + 1;
782 // expand the array and add arg to the last element
783 if (*bldarray == NULL) {
784 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
785 } else {
786 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
787 }
788 (*bldarray)[*count] = strdup(arg);
789 *count = new_count;
790 }
792 void Arguments::build_jvm_args(const char* arg) {
793 add_string(&_jvm_args_array, &_num_jvm_args, arg);
794 }
796 void Arguments::build_jvm_flags(const char* arg) {
797 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
798 }
800 // utility function to return a string that concatenates all
801 // strings in a given char** array
802 const char* Arguments::build_resource_string(char** args, int count) {
803 if (args == NULL || count == 0) {
804 return NULL;
805 }
806 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
807 for (int i = 1; i < count; i++) {
808 length += strlen(args[i]) + 1; // add 1 for a space
809 }
810 char* s = NEW_RESOURCE_ARRAY(char, length);
811 strcpy(s, args[0]);
812 for (int j = 1; j < count; j++) {
813 strcat(s, " ");
814 strcat(s, args[j]);
815 }
816 return (const char*) s;
817 }
819 void Arguments::print_on(outputStream* st) {
820 st->print_cr("VM Arguments:");
821 if (num_jvm_flags() > 0) {
822 st->print("jvm_flags: "); print_jvm_flags_on(st);
823 }
824 if (num_jvm_args() > 0) {
825 st->print("jvm_args: "); print_jvm_args_on(st);
826 }
827 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
828 if (_java_class_path != NULL) {
829 char* path = _java_class_path->value();
830 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
831 }
832 st->print_cr("Launcher Type: %s", _sun_java_launcher);
833 }
835 void Arguments::print_jvm_flags_on(outputStream* st) {
836 if (_num_jvm_flags > 0) {
837 for (int i=0; i < _num_jvm_flags; i++) {
838 st->print("%s ", _jvm_flags_array[i]);
839 }
840 st->print_cr("");
841 }
842 }
844 void Arguments::print_jvm_args_on(outputStream* st) {
845 if (_num_jvm_args > 0) {
846 for (int i=0; i < _num_jvm_args; i++) {
847 st->print("%s ", _jvm_args_array[i]);
848 }
849 st->print_cr("");
850 }
851 }
853 bool Arguments::process_argument(const char* arg,
854 jboolean ignore_unrecognized, Flag::Flags origin) {
856 JDK_Version since = JDK_Version();
858 if (parse_argument(arg, origin) || ignore_unrecognized) {
859 return true;
860 }
862 bool has_plus_minus = (*arg == '+' || *arg == '-');
863 const char* const argname = has_plus_minus ? arg + 1 : arg;
864 if (is_newly_obsolete(arg, &since)) {
865 char version[256];
866 since.to_string(version, sizeof(version));
867 warning("ignoring option %s; support was removed in %s", argname, version);
868 return true;
869 }
871 // For locked flags, report a custom error message if available.
872 // Otherwise, report the standard unrecognized VM option.
874 size_t arg_len;
875 const char* equal_sign = strchr(argname, '=');
876 if (equal_sign == NULL) {
877 arg_len = strlen(argname);
878 } else {
879 arg_len = equal_sign - argname;
880 }
882 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
883 if (found_flag != NULL) {
884 char locked_message_buf[BUFLEN];
885 found_flag->get_locked_message(locked_message_buf, BUFLEN);
886 if (strlen(locked_message_buf) == 0) {
887 if (found_flag->is_bool() && !has_plus_minus) {
888 jio_fprintf(defaultStream::error_stream(),
889 "Missing +/- setting for VM option '%s'\n", argname);
890 } else if (!found_flag->is_bool() && has_plus_minus) {
891 jio_fprintf(defaultStream::error_stream(),
892 "Unexpected +/- setting in VM option '%s'\n", argname);
893 } else {
894 jio_fprintf(defaultStream::error_stream(),
895 "Improperly specified VM option '%s'\n", argname);
896 }
897 } else {
898 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
899 }
900 } else {
901 jio_fprintf(defaultStream::error_stream(),
902 "Unrecognized VM option '%s'\n", argname);
903 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
904 if (fuzzy_matched != NULL) {
905 jio_fprintf(defaultStream::error_stream(),
906 "Did you mean '%s%s%s'?\n",
907 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
908 fuzzy_matched->_name,
909 (fuzzy_matched->is_bool()) ? "" : "=<value>");
910 }
911 }
913 // allow for commandline "commenting out" options like -XX:#+Verbose
914 return arg[0] == '#';
915 }
917 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
918 FILE* stream = fopen(file_name, "rb");
919 if (stream == NULL) {
920 if (should_exist) {
921 jio_fprintf(defaultStream::error_stream(),
922 "Could not open settings file %s\n", file_name);
923 return false;
924 } else {
925 return true;
926 }
927 }
929 char token[1024];
930 int pos = 0;
932 bool in_white_space = true;
933 bool in_comment = false;
934 bool in_quote = false;
935 char quote_c = 0;
936 bool result = true;
938 int c = getc(stream);
939 while(c != EOF && pos < (int)(sizeof(token)-1)) {
940 if (in_white_space) {
941 if (in_comment) {
942 if (c == '\n') in_comment = false;
943 } else {
944 if (c == '#') in_comment = true;
945 else if (!isspace(c)) {
946 in_white_space = false;
947 token[pos++] = c;
948 }
949 }
950 } else {
951 if (c == '\n' || (!in_quote && isspace(c))) {
952 // token ends at newline, or at unquoted whitespace
953 // this allows a way to include spaces in string-valued options
954 token[pos] = '\0';
955 logOption(token);
956 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
957 build_jvm_flags(token);
958 pos = 0;
959 in_white_space = true;
960 in_quote = false;
961 } else if (!in_quote && (c == '\'' || c == '"')) {
962 in_quote = true;
963 quote_c = c;
964 } else if (in_quote && (c == quote_c)) {
965 in_quote = false;
966 } else {
967 token[pos++] = c;
968 }
969 }
970 c = getc(stream);
971 }
972 if (pos > 0) {
973 token[pos] = '\0';
974 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
975 build_jvm_flags(token);
976 }
977 fclose(stream);
978 return result;
979 }
981 //=============================================================================================================
982 // Parsing of properties (-D)
984 const char* Arguments::get_property(const char* key) {
985 return PropertyList_get_value(system_properties(), key);
986 }
988 bool Arguments::add_property(const char* prop) {
989 const char* eq = strchr(prop, '=');
990 char* key;
991 // ns must be static--its address may be stored in a SystemProperty object.
992 const static char ns[1] = {0};
993 char* value = (char *)ns;
995 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
996 key = AllocateHeap(key_len + 1, mtInternal);
997 strncpy(key, prop, key_len);
998 key[key_len] = '\0';
1000 if (eq != NULL) {
1001 size_t value_len = strlen(prop) - key_len - 1;
1002 value = AllocateHeap(value_len + 1, mtInternal);
1003 strncpy(value, &prop[key_len + 1], value_len + 1);
1004 }
1006 if (strcmp(key, "java.compiler") == 0) {
1007 process_java_compiler_argument(value);
1008 FreeHeap(key);
1009 if (eq != NULL) {
1010 FreeHeap(value);
1011 }
1012 return true;
1013 } else if (strcmp(key, "sun.java.command") == 0) {
1014 _java_command = value;
1016 // Record value in Arguments, but let it get passed to Java.
1017 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1018 // launcher.pid property is private and is processed
1019 // in process_sun_java_launcher_properties();
1020 // the sun.java.launcher property is passed on to the java application
1021 FreeHeap(key);
1022 if (eq != NULL) {
1023 FreeHeap(value);
1024 }
1025 return true;
1026 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1027 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1028 // its value without going through the property list or making a Java call.
1029 _java_vendor_url_bug = value;
1030 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1031 PropertyList_unique_add(&_system_properties, key, value, true);
1032 return true;
1033 }
1034 // Create new property and add at the end of the list
1035 PropertyList_unique_add(&_system_properties, key, value);
1036 return true;
1037 }
1039 //===========================================================================================================
1040 // Setting int/mixed/comp mode flags
1042 void Arguments::set_mode_flags(Mode mode) {
1043 // Set up default values for all flags.
1044 // If you add a flag to any of the branches below,
1045 // add a default value for it here.
1046 set_java_compiler(false);
1047 _mode = mode;
1049 // Ensure Agent_OnLoad has the correct initial values.
1050 // This may not be the final mode; mode may change later in onload phase.
1051 PropertyList_unique_add(&_system_properties, "java.vm.info",
1052 (char*)VM_Version::vm_info_string(), false);
1054 UseInterpreter = true;
1055 UseCompiler = true;
1056 UseLoopCounter = true;
1058 #ifndef ZERO
1059 // Turn these off for mixed and comp. Leave them on for Zero.
1060 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1061 UseFastAccessorMethods = (mode == _int);
1062 }
1063 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1064 UseFastEmptyMethods = (mode == _int);
1065 }
1066 #endif
1068 // Default values may be platform/compiler dependent -
1069 // use the saved values
1070 ClipInlining = Arguments::_ClipInlining;
1071 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1072 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1073 BackgroundCompilation = Arguments::_BackgroundCompilation;
1075 // Change from defaults based on mode
1076 switch (mode) {
1077 default:
1078 ShouldNotReachHere();
1079 break;
1080 case _int:
1081 UseCompiler = false;
1082 UseLoopCounter = false;
1083 AlwaysCompileLoopMethods = false;
1084 UseOnStackReplacement = false;
1085 break;
1086 case _mixed:
1087 // same as default
1088 break;
1089 case _comp:
1090 UseInterpreter = false;
1091 BackgroundCompilation = false;
1092 ClipInlining = false;
1093 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1094 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1095 // compile a level 4 (C2) and then continue executing it.
1096 if (TieredCompilation) {
1097 Tier3InvokeNotifyFreqLog = 0;
1098 Tier4InvocationThreshold = 0;
1099 }
1100 break;
1101 }
1102 }
1104 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1105 // Conflict: required to use shared spaces (-Xshare:on), but
1106 // incompatible command line options were chosen.
1108 static void no_shared_spaces() {
1109 if (RequireSharedSpaces) {
1110 jio_fprintf(defaultStream::error_stream(),
1111 "Class data sharing is inconsistent with other specified options.\n");
1112 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1113 } else {
1114 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1115 }
1116 }
1117 #endif
1119 void Arguments::set_tiered_flags() {
1120 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1121 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1122 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1123 }
1124 if (CompilationPolicyChoice < 2) {
1125 vm_exit_during_initialization(
1126 "Incompatible compilation policy selected", NULL);
1127 }
1128 // Increase the code cache size - tiered compiles a lot more.
1129 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1130 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1131 }
1132 if (!UseInterpreter) { // -Xcomp
1133 Tier3InvokeNotifyFreqLog = 0;
1134 Tier4InvocationThreshold = 0;
1135 }
1136 }
1138 #if INCLUDE_ALL_GCS
1139 static void disable_adaptive_size_policy(const char* collector_name) {
1140 if (UseAdaptiveSizePolicy) {
1141 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1142 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1143 collector_name);
1144 }
1145 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1146 }
1147 }
1149 void Arguments::set_parnew_gc_flags() {
1150 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1151 "control point invariant");
1152 assert(UseParNewGC, "Error");
1154 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1155 disable_adaptive_size_policy("UseParNewGC");
1157 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1158 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1159 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1160 } else if (ParallelGCThreads == 0) {
1161 jio_fprintf(defaultStream::error_stream(),
1162 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1163 vm_exit(1);
1164 }
1166 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1167 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1168 // we set them to 1024 and 1024.
1169 // See CR 6362902.
1170 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1171 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1172 }
1173 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1174 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1175 }
1177 // AlwaysTenure flag should make ParNew promote all at first collection.
1178 // See CR 6362902.
1179 if (AlwaysTenure) {
1180 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1181 }
1182 // When using compressed oops, we use local overflow stacks,
1183 // rather than using a global overflow list chained through
1184 // the klass word of the object's pre-image.
1185 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1186 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1187 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1188 }
1189 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1190 }
1191 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1192 }
1194 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1195 // sparc/solaris for certain applications, but would gain from
1196 // further optimization and tuning efforts, and would almost
1197 // certainly gain from analysis of platform and environment.
1198 void Arguments::set_cms_and_parnew_gc_flags() {
1199 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1200 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1202 // If we are using CMS, we prefer to UseParNewGC,
1203 // unless explicitly forbidden.
1204 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1205 FLAG_SET_ERGO(bool, UseParNewGC, true);
1206 }
1208 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1209 disable_adaptive_size_policy("UseConcMarkSweepGC");
1211 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1212 // as needed.
1213 if (UseParNewGC) {
1214 set_parnew_gc_flags();
1215 }
1217 size_t max_heap = align_size_down(MaxHeapSize,
1218 CardTableRS::ct_max_alignment_constraint());
1220 // Now make adjustments for CMS
1221 intx tenuring_default = (intx)6;
1222 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1224 // Preferred young gen size for "short" pauses:
1225 // upper bound depends on # of threads and NewRatio.
1226 const uintx parallel_gc_threads =
1227 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1228 const size_t preferred_max_new_size_unaligned =
1229 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1230 size_t preferred_max_new_size =
1231 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1233 // Unless explicitly requested otherwise, size young gen
1234 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1236 // If either MaxNewSize or NewRatio is set on the command line,
1237 // assume the user is trying to set the size of the young gen.
1238 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1240 // Set MaxNewSize to our calculated preferred_max_new_size unless
1241 // NewSize was set on the command line and it is larger than
1242 // preferred_max_new_size.
1243 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1244 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1245 } else {
1246 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1247 }
1248 if (PrintGCDetails && Verbose) {
1249 // Too early to use gclog_or_tty
1250 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1251 }
1253 // Code along this path potentially sets NewSize and OldSize
1254 if (PrintGCDetails && Verbose) {
1255 // Too early to use gclog_or_tty
1256 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1257 " initial_heap_size: " SIZE_FORMAT
1258 " max_heap: " SIZE_FORMAT,
1259 min_heap_size(), InitialHeapSize, max_heap);
1260 }
1261 size_t min_new = preferred_max_new_size;
1262 if (FLAG_IS_CMDLINE(NewSize)) {
1263 min_new = NewSize;
1264 }
1265 if (max_heap > min_new && min_heap_size() > min_new) {
1266 // Unless explicitly requested otherwise, make young gen
1267 // at least min_new, and at most preferred_max_new_size.
1268 if (FLAG_IS_DEFAULT(NewSize)) {
1269 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1270 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1271 if (PrintGCDetails && Verbose) {
1272 // Too early to use gclog_or_tty
1273 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1274 }
1275 }
1276 // Unless explicitly requested otherwise, size old gen
1277 // so it's NewRatio x of NewSize.
1278 if (FLAG_IS_DEFAULT(OldSize)) {
1279 if (max_heap > NewSize) {
1280 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1281 if (PrintGCDetails && Verbose) {
1282 // Too early to use gclog_or_tty
1283 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1284 }
1285 }
1286 }
1287 }
1288 }
1289 // Unless explicitly requested otherwise, definitely
1290 // promote all objects surviving "tenuring_default" scavenges.
1291 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1292 FLAG_IS_DEFAULT(SurvivorRatio)) {
1293 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1294 }
1295 // If we decided above (or user explicitly requested)
1296 // `promote all' (via MaxTenuringThreshold := 0),
1297 // prefer minuscule survivor spaces so as not to waste
1298 // space for (non-existent) survivors
1299 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1300 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1301 }
1302 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1303 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1304 // This is done in order to make ParNew+CMS configuration to work
1305 // with YoungPLABSize and OldPLABSize options.
1306 // See CR 6362902.
1307 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1308 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1309 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1310 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1311 // the value (either from the command line or ergonomics) of
1312 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1313 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1314 } else {
1315 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1316 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1317 // we'll let it to take precedence.
1318 jio_fprintf(defaultStream::error_stream(),
1319 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1320 " options are specified for the CMS collector."
1321 " CMSParPromoteBlocksToClaim will take precedence.\n");
1322 }
1323 }
1324 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1325 // OldPLAB sizing manually turned off: Use a larger default setting,
1326 // unless it was manually specified. This is because a too-low value
1327 // will slow down scavenges.
1328 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1329 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1330 }
1331 }
1332 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1333 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1334 // If either of the static initialization defaults have changed, note this
1335 // modification.
1336 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1337 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1338 }
1339 if (PrintGCDetails && Verbose) {
1340 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1341 MarkStackSize / K, MarkStackSizeMax / K);
1342 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1343 }
1344 }
1345 #endif // INCLUDE_ALL_GCS
1347 void set_object_alignment() {
1348 // Object alignment.
1349 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1350 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1351 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1352 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1353 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1354 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1356 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1357 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1359 // Oop encoding heap max
1360 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1362 #if INCLUDE_ALL_GCS
1363 // Set CMS global values
1364 CompactibleFreeListSpace::set_cms_values();
1365 #endif // INCLUDE_ALL_GCS
1366 }
1368 bool verify_object_alignment() {
1369 // Object alignment.
1370 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1371 jio_fprintf(defaultStream::error_stream(),
1372 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1373 (int)ObjectAlignmentInBytes);
1374 return false;
1375 }
1376 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1377 jio_fprintf(defaultStream::error_stream(),
1378 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1379 (int)ObjectAlignmentInBytes, BytesPerLong);
1380 return false;
1381 }
1382 // It does not make sense to have big object alignment
1383 // since a space lost due to alignment will be greater
1384 // then a saved space from compressed oops.
1385 if ((int)ObjectAlignmentInBytes > 256) {
1386 jio_fprintf(defaultStream::error_stream(),
1387 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1388 (int)ObjectAlignmentInBytes);
1389 return false;
1390 }
1391 // In case page size is very small.
1392 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1393 jio_fprintf(defaultStream::error_stream(),
1394 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1395 (int)ObjectAlignmentInBytes, os::vm_page_size());
1396 return false;
1397 }
1398 return true;
1399 }
1401 uintx Arguments::max_heap_for_compressed_oops() {
1402 // Avoid sign flip.
1403 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1404 // We need to fit both the NULL page and the heap into the memory budget, while
1405 // keeping alignment constraints of the heap. To guarantee the latter, as the
1406 // NULL page is located before the heap, we pad the NULL page to the conservative
1407 // maximum alignment that the GC may ever impose upon the heap.
1408 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1409 _conservative_max_heap_alignment);
1411 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1412 NOT_LP64(ShouldNotReachHere(); return 0);
1413 }
1415 bool Arguments::should_auto_select_low_pause_collector() {
1416 if (UseAutoGCSelectPolicy &&
1417 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1418 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1419 if (PrintGCDetails) {
1420 // Cannot use gclog_or_tty yet.
1421 tty->print_cr("Automatic selection of the low pause collector"
1422 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1423 }
1424 return true;
1425 }
1426 return false;
1427 }
1429 void Arguments::set_use_compressed_oops() {
1430 #ifndef ZERO
1431 #ifdef _LP64
1432 // MaxHeapSize is not set up properly at this point, but
1433 // the only value that can override MaxHeapSize if we are
1434 // to use UseCompressedOops is InitialHeapSize.
1435 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1437 if (max_heap_size <= max_heap_for_compressed_oops()) {
1438 #if !defined(COMPILER1) || defined(TIERED)
1439 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1440 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1441 }
1442 #endif
1443 #ifdef _WIN64
1444 if (UseLargePages && UseCompressedOops) {
1445 // Cannot allocate guard pages for implicit checks in indexed addressing
1446 // mode, when large pages are specified on windows.
1447 // This flag could be switched ON if narrow oop base address is set to 0,
1448 // see code in Universe::initialize_heap().
1449 Universe::set_narrow_oop_use_implicit_null_checks(false);
1450 }
1451 #endif // _WIN64
1452 } else {
1453 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1454 warning("Max heap size too large for Compressed Oops");
1455 FLAG_SET_DEFAULT(UseCompressedOops, false);
1456 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1457 }
1458 }
1459 #endif // _LP64
1460 #endif // ZERO
1461 }
1464 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1465 // set_use_compressed_oops().
1466 void Arguments::set_use_compressed_klass_ptrs() {
1467 #ifndef ZERO
1468 #ifdef _LP64
1469 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1470 if (!UseCompressedOops) {
1471 if (UseCompressedClassPointers) {
1472 warning("UseCompressedClassPointers requires UseCompressedOops");
1473 }
1474 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1475 } else {
1476 // Turn on UseCompressedClassPointers too
1477 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1478 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1479 }
1480 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1481 if (UseCompressedClassPointers) {
1482 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1483 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1484 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1485 }
1486 }
1487 }
1488 #endif // _LP64
1489 #endif // !ZERO
1490 }
1492 void Arguments::set_conservative_max_heap_alignment() {
1493 // The conservative maximum required alignment for the heap is the maximum of
1494 // the alignments imposed by several sources: any requirements from the heap
1495 // itself, the collector policy and the maximum page size we may run the VM
1496 // with.
1497 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1498 #if INCLUDE_ALL_GCS
1499 if (UseParallelGC) {
1500 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1501 } else if (UseG1GC) {
1502 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1503 }
1504 #endif // INCLUDE_ALL_GCS
1505 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1506 CollectorPolicy::compute_heap_alignment());
1507 }
1509 void Arguments::set_ergonomics_flags() {
1511 if (os::is_server_class_machine()) {
1512 // If no other collector is requested explicitly,
1513 // let the VM select the collector based on
1514 // machine class and automatic selection policy.
1515 if (!UseSerialGC &&
1516 !UseConcMarkSweepGC &&
1517 !UseG1GC &&
1518 !UseParNewGC &&
1519 FLAG_IS_DEFAULT(UseParallelGC)) {
1520 if (should_auto_select_low_pause_collector()) {
1521 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1522 } else {
1523 FLAG_SET_ERGO(bool, UseParallelGC, true);
1524 }
1525 }
1526 }
1527 #ifdef COMPILER2
1528 // Shared spaces work fine with other GCs but causes bytecode rewriting
1529 // to be disabled, which hurts interpreter performance and decreases
1530 // server performance. When -server is specified, keep the default off
1531 // unless it is asked for. Future work: either add bytecode rewriting
1532 // at link time, or rewrite bytecodes in non-shared methods.
1533 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1534 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1535 no_shared_spaces();
1536 }
1537 #endif
1539 set_conservative_max_heap_alignment();
1541 #ifndef ZERO
1542 #ifdef _LP64
1543 set_use_compressed_oops();
1545 // set_use_compressed_klass_ptrs() must be called after calling
1546 // set_use_compressed_oops().
1547 set_use_compressed_klass_ptrs();
1549 // Also checks that certain machines are slower with compressed oops
1550 // in vm_version initialization code.
1551 #endif // _LP64
1552 #endif // !ZERO
1553 }
1555 void Arguments::set_parallel_gc_flags() {
1556 assert(UseParallelGC || UseParallelOldGC, "Error");
1557 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1558 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1559 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1560 }
1561 FLAG_SET_DEFAULT(UseParallelGC, true);
1563 // If no heap maximum was requested explicitly, use some reasonable fraction
1564 // of the physical memory, up to a maximum of 1GB.
1565 FLAG_SET_DEFAULT(ParallelGCThreads,
1566 Abstract_VM_Version::parallel_worker_threads());
1567 if (ParallelGCThreads == 0) {
1568 jio_fprintf(defaultStream::error_stream(),
1569 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1570 vm_exit(1);
1571 }
1573 if (UseAdaptiveSizePolicy) {
1574 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1575 // unless the user actually sets these flags.
1576 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1577 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1578 }
1579 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1580 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1581 }
1582 }
1584 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1585 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1586 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1587 // See CR 6362902 for details.
1588 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1589 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1590 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1591 }
1592 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1593 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1594 }
1595 }
1597 if (UseParallelOldGC) {
1598 // Par compact uses lower default values since they are treated as
1599 // minimums. These are different defaults because of the different
1600 // interpretation and are not ergonomically set.
1601 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1602 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1603 }
1604 }
1605 }
1607 void Arguments::set_g1_gc_flags() {
1608 assert(UseG1GC, "Error");
1609 #ifdef COMPILER1
1610 FastTLABRefill = false;
1611 #endif
1612 FLAG_SET_DEFAULT(ParallelGCThreads,
1613 Abstract_VM_Version::parallel_worker_threads());
1614 if (ParallelGCThreads == 0) {
1615 FLAG_SET_DEFAULT(ParallelGCThreads,
1616 Abstract_VM_Version::parallel_worker_threads());
1617 }
1619 // MarkStackSize will be set (if it hasn't been set by the user)
1620 // when concurrent marking is initialized.
1621 // Its value will be based upon the number of parallel marking threads.
1622 // But we do set the maximum mark stack size here.
1623 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1624 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1625 }
1627 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1628 // In G1, we want the default GC overhead goal to be higher than
1629 // say in PS. So we set it here to 10%. Otherwise the heap might
1630 // be expanded more aggressively than we would like it to. In
1631 // fact, even 10% seems to not be high enough in some cases
1632 // (especially small GC stress tests that the main thing they do
1633 // is allocation). We might consider increase it further.
1634 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1635 }
1637 if (PrintGCDetails && Verbose) {
1638 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1639 MarkStackSize / K, MarkStackSizeMax / K);
1640 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1641 }
1642 }
1644 julong Arguments::limit_by_allocatable_memory(julong limit) {
1645 julong max_allocatable;
1646 julong result = limit;
1647 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1648 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1649 }
1650 return result;
1651 }
1653 void Arguments::set_heap_size() {
1654 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1655 // Deprecated flag
1656 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1657 }
1659 const julong phys_mem =
1660 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1661 : (julong)MaxRAM;
1663 // If the maximum heap size has not been set with -Xmx,
1664 // then set it as fraction of the size of physical memory,
1665 // respecting the maximum and minimum sizes of the heap.
1666 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1667 julong reasonable_max = phys_mem / MaxRAMFraction;
1669 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1670 // Small physical memory, so use a minimum fraction of it for the heap
1671 reasonable_max = phys_mem / MinRAMFraction;
1672 } else {
1673 // Not-small physical memory, so require a heap at least
1674 // as large as MaxHeapSize
1675 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1676 }
1677 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1678 // Limit the heap size to ErgoHeapSizeLimit
1679 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1680 }
1681 if (UseCompressedOops) {
1682 // Limit the heap size to the maximum possible when using compressed oops
1683 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1684 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1685 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1686 // but it should be not less than default MaxHeapSize.
1687 max_coop_heap -= HeapBaseMinAddress;
1688 }
1689 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1690 }
1691 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1693 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1694 // An initial heap size was specified on the command line,
1695 // so be sure that the maximum size is consistent. Done
1696 // after call to limit_by_allocatable_memory because that
1697 // method might reduce the allocation size.
1698 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1699 }
1701 if (PrintGCDetails && Verbose) {
1702 // Cannot use gclog_or_tty yet.
1703 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1704 }
1705 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1706 }
1708 // If the minimum or initial heap_size have not been set or requested to be set
1709 // ergonomically, set them accordingly.
1710 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1711 julong reasonable_minimum = (julong)(OldSize + NewSize);
1713 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1715 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1717 if (InitialHeapSize == 0) {
1718 julong reasonable_initial = phys_mem / InitialRAMFraction;
1720 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1721 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1723 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1725 if (PrintGCDetails && Verbose) {
1726 // Cannot use gclog_or_tty yet.
1727 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1728 }
1729 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1730 }
1731 // If the minimum heap size has not been set (via -Xms),
1732 // synchronize with InitialHeapSize to avoid errors with the default value.
1733 if (min_heap_size() == 0) {
1734 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1735 if (PrintGCDetails && Verbose) {
1736 // Cannot use gclog_or_tty yet.
1737 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1738 }
1739 }
1740 }
1741 }
1743 // This must be called after ergonomics because we want bytecode rewriting
1744 // if the server compiler is used, or if UseSharedSpaces is disabled.
1745 void Arguments::set_bytecode_flags() {
1746 // Better not attempt to store into a read-only space.
1747 if (UseSharedSpaces) {
1748 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1749 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1750 }
1752 if (!RewriteBytecodes) {
1753 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1754 }
1755 }
1757 // Aggressive optimization flags -XX:+AggressiveOpts
1758 void Arguments::set_aggressive_opts_flags() {
1759 #ifdef COMPILER2
1760 if (AggressiveUnboxing) {
1761 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1762 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1763 } else if (!EliminateAutoBox) {
1764 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1765 AggressiveUnboxing = false;
1766 }
1767 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1768 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1769 } else if (!DoEscapeAnalysis) {
1770 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1771 AggressiveUnboxing = false;
1772 }
1773 }
1774 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1775 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1776 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1777 }
1778 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1779 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1780 }
1782 // Feed the cache size setting into the JDK
1783 char buffer[1024];
1784 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1785 add_property(buffer);
1786 }
1787 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1788 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1789 }
1790 #endif
1792 if (AggressiveOpts) {
1793 // Sample flag setting code
1794 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1795 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1796 // }
1797 }
1798 }
1800 //===========================================================================================================
1801 // Parsing of java.compiler property
1803 void Arguments::process_java_compiler_argument(char* arg) {
1804 // For backwards compatibility, Djava.compiler=NONE or ""
1805 // causes us to switch to -Xint mode UNLESS -Xdebug
1806 // is also specified.
1807 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1808 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1809 }
1810 }
1812 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1813 _sun_java_launcher = strdup(launcher);
1814 if (strcmp("gamma", _sun_java_launcher) == 0) {
1815 _created_by_gamma_launcher = true;
1816 }
1817 }
1819 bool Arguments::created_by_java_launcher() {
1820 assert(_sun_java_launcher != NULL, "property must have value");
1821 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1822 }
1824 bool Arguments::created_by_gamma_launcher() {
1825 return _created_by_gamma_launcher;
1826 }
1828 //===========================================================================================================
1829 // Parsing of main arguments
1831 bool Arguments::verify_interval(uintx val, uintx min,
1832 uintx max, const char* name) {
1833 // Returns true iff value is in the inclusive interval [min..max]
1834 // false, otherwise.
1835 if (val >= min && val <= max) {
1836 return true;
1837 }
1838 jio_fprintf(defaultStream::error_stream(),
1839 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1840 " and " UINTX_FORMAT "\n",
1841 name, val, min, max);
1842 return false;
1843 }
1845 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1846 // Returns true if given value is at least specified min threshold
1847 // false, otherwise.
1848 if (val >= min ) {
1849 return true;
1850 }
1851 jio_fprintf(defaultStream::error_stream(),
1852 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1853 name, val, min);
1854 return false;
1855 }
1857 bool Arguments::verify_percentage(uintx value, const char* name) {
1858 if (is_percentage(value)) {
1859 return true;
1860 }
1861 jio_fprintf(defaultStream::error_stream(),
1862 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1863 name, value);
1864 return false;
1865 }
1867 #if !INCLUDE_ALL_GCS
1868 #ifdef ASSERT
1869 static bool verify_serial_gc_flags() {
1870 return (UseSerialGC &&
1871 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1872 UseParallelGC || UseParallelOldGC));
1873 }
1874 #endif // ASSERT
1875 #endif // INCLUDE_ALL_GCS
1877 // check if do gclog rotation
1878 // +UseGCLogFileRotation is a must,
1879 // no gc log rotation when log file not supplied or
1880 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1881 void check_gclog_consistency() {
1882 if (UseGCLogFileRotation) {
1883 if ((Arguments::gc_log_filename() == NULL) ||
1884 (NumberOfGCLogFiles == 0) ||
1885 (GCLogFileSize == 0)) {
1886 jio_fprintf(defaultStream::output_stream(),
1887 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n"
1888 "where num_of_file > 0 and num_of_size > 0\n"
1889 "GC log rotation is turned off\n");
1890 UseGCLogFileRotation = false;
1891 }
1892 }
1894 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1895 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1896 jio_fprintf(defaultStream::output_stream(),
1897 "GCLogFileSize changed to minimum 8K\n");
1898 }
1899 }
1901 // This function is called for -Xloggc:<filename>, it can be used
1902 // to check if a given file name(or string) conforms to the following
1903 // specification:
1904 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1905 // %p and %t only allowed once. We only limit usage of filename not path
1906 bool is_filename_valid(const char *file_name) {
1907 const char* p = file_name;
1908 char file_sep = os::file_separator()[0];
1909 const char* cp;
1910 // skip prefix path
1911 for (cp = file_name; *cp != '\0'; cp++) {
1912 if (*cp == '/' || *cp == file_sep) {
1913 p = cp + 1;
1914 }
1915 }
1917 int count_p = 0;
1918 int count_t = 0;
1919 while (*p != '\0') {
1920 if ((*p >= '0' && *p <= '9') ||
1921 (*p >= 'A' && *p <= 'Z') ||
1922 (*p >= 'a' && *p <= 'z') ||
1923 *p == '-' ||
1924 *p == '_' ||
1925 *p == '.') {
1926 p++;
1927 continue;
1928 }
1929 if (*p == '%') {
1930 if(*(p + 1) == 'p') {
1931 p += 2;
1932 count_p ++;
1933 continue;
1934 }
1935 if (*(p + 1) == 't') {
1936 p += 2;
1937 count_t ++;
1938 continue;
1939 }
1940 }
1941 return false;
1942 }
1943 return count_p < 2 && count_t < 2;
1944 }
1946 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1947 if (!is_percentage(min_heap_free_ratio)) {
1948 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1949 return false;
1950 }
1951 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1952 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1953 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1954 MaxHeapFreeRatio);
1955 return false;
1956 }
1957 return true;
1958 }
1960 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1961 if (!is_percentage(max_heap_free_ratio)) {
1962 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1963 return false;
1964 }
1965 if (max_heap_free_ratio < MinHeapFreeRatio) {
1966 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1967 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1968 MinHeapFreeRatio);
1969 return false;
1970 }
1971 return true;
1972 }
1974 // Check consistency of GC selection
1975 bool Arguments::check_gc_consistency() {
1976 check_gclog_consistency();
1977 bool status = true;
1978 // Ensure that the user has not selected conflicting sets
1979 // of collectors. [Note: this check is merely a user convenience;
1980 // collectors over-ride each other so that only a non-conflicting
1981 // set is selected; however what the user gets is not what they
1982 // may have expected from the combination they asked for. It's
1983 // better to reduce user confusion by not allowing them to
1984 // select conflicting combinations.
1985 uint i = 0;
1986 if (UseSerialGC) i++;
1987 if (UseConcMarkSweepGC || UseParNewGC) i++;
1988 if (UseParallelGC || UseParallelOldGC) i++;
1989 if (UseG1GC) i++;
1990 if (i > 1) {
1991 jio_fprintf(defaultStream::error_stream(),
1992 "Conflicting collector combinations in option list; "
1993 "please refer to the release notes for the combinations "
1994 "allowed\n");
1995 status = false;
1996 }
1997 return status;
1998 }
2000 void Arguments::check_deprecated_gcs() {
2001 if (UseConcMarkSweepGC && !UseParNewGC) {
2002 warning("Using the DefNew young collector with the CMS collector is deprecated "
2003 "and will likely be removed in a future release");
2004 }
2006 if (UseParNewGC && !UseConcMarkSweepGC) {
2007 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2008 // set up UseSerialGC properly, so that can't be used in the check here.
2009 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2010 "and will likely be removed in a future release");
2011 }
2013 if (CMSIncrementalMode) {
2014 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2015 }
2016 }
2018 void Arguments::check_deprecated_gc_flags() {
2019 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2020 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2021 "and will likely be removed in future release");
2022 }
2023 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2024 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2025 "Use MaxRAMFraction instead.");
2026 }
2027 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2028 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2029 }
2030 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2031 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2032 }
2033 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2034 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2035 }
2036 }
2038 // Check stack pages settings
2039 bool Arguments::check_stack_pages()
2040 {
2041 bool status = true;
2042 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2043 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2044 // greater stack shadow pages can't generate instruction to bang stack
2045 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2046 return status;
2047 }
2049 // Check the consistency of vm_init_args
2050 bool Arguments::check_vm_args_consistency() {
2051 // Method for adding checks for flag consistency.
2052 // The intent is to warn the user of all possible conflicts,
2053 // before returning an error.
2054 // Note: Needs platform-dependent factoring.
2055 bool status = true;
2057 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2058 // builds so the cost of stack banging can be measured.
2059 #if (defined(PRODUCT) && defined(SOLARIS))
2060 if (!UseBoundThreads && !UseStackBanging) {
2061 jio_fprintf(defaultStream::error_stream(),
2062 "-UseStackBanging conflicts with -UseBoundThreads\n");
2064 status = false;
2065 }
2066 #endif
2068 if (TLABRefillWasteFraction == 0) {
2069 jio_fprintf(defaultStream::error_stream(),
2070 "TLABRefillWasteFraction should be a denominator, "
2071 "not " SIZE_FORMAT "\n",
2072 TLABRefillWasteFraction);
2073 status = false;
2074 }
2076 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2077 "AdaptiveSizePolicyWeight");
2078 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2080 // Divide by bucket size to prevent a large size from causing rollover when
2081 // calculating amount of memory needed to be allocated for the String table.
2082 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2083 (max_uintx / StringTable::bucket_size()), "StringTable size");
2085 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2086 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2088 {
2089 // Using "else if" below to avoid printing two error messages if min > max.
2090 // This will also prevent us from reporting both min>100 and max>100 at the
2091 // same time, but that is less annoying than printing two identical errors IMHO.
2092 FormatBuffer<80> err_msg("");
2093 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2094 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2095 status = false;
2096 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2097 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2098 status = false;
2099 }
2100 }
2102 // Min/MaxMetaspaceFreeRatio
2103 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2104 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2106 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2107 jio_fprintf(defaultStream::error_stream(),
2108 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2109 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2110 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2111 MinMetaspaceFreeRatio,
2112 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2113 MaxMetaspaceFreeRatio);
2114 status = false;
2115 }
2117 // Trying to keep 100% free is not practical
2118 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2120 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2121 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2122 }
2124 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2125 // Settings to encourage splitting.
2126 if (!FLAG_IS_CMDLINE(NewRatio)) {
2127 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2128 }
2129 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2130 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2131 }
2132 }
2134 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2135 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2136 if (GCTimeLimit == 100) {
2137 // Turn off gc-overhead-limit-exceeded checks
2138 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2139 }
2141 status = status && check_gc_consistency();
2142 status = status && check_stack_pages();
2144 if (CMSIncrementalMode) {
2145 if (!UseConcMarkSweepGC) {
2146 jio_fprintf(defaultStream::error_stream(),
2147 "error: invalid argument combination.\n"
2148 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2149 "selected in order\nto use CMSIncrementalMode.\n");
2150 status = false;
2151 } else {
2152 status = status && verify_percentage(CMSIncrementalDutyCycle,
2153 "CMSIncrementalDutyCycle");
2154 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2155 "CMSIncrementalDutyCycleMin");
2156 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2157 "CMSIncrementalSafetyFactor");
2158 status = status && verify_percentage(CMSIncrementalOffset,
2159 "CMSIncrementalOffset");
2160 status = status && verify_percentage(CMSExpAvgFactor,
2161 "CMSExpAvgFactor");
2162 // If it was not set on the command line, set
2163 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2164 if (CMSInitiatingOccupancyFraction < 0) {
2165 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2166 }
2167 }
2168 }
2170 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2171 // insists that we hold the requisite locks so that the iteration is
2172 // MT-safe. For the verification at start-up and shut-down, we don't
2173 // yet have a good way of acquiring and releasing these locks,
2174 // which are not visible at the CollectedHeap level. We want to
2175 // be able to acquire these locks and then do the iteration rather
2176 // than just disable the lock verification. This will be fixed under
2177 // bug 4788986.
2178 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2179 if (VerifyDuringStartup) {
2180 warning("Heap verification at start-up disabled "
2181 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2182 VerifyDuringStartup = false; // Disable verification at start-up
2183 }
2185 if (VerifyBeforeExit) {
2186 warning("Heap verification at shutdown disabled "
2187 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2188 VerifyBeforeExit = false; // Disable verification at shutdown
2189 }
2190 }
2192 // Note: only executed in non-PRODUCT mode
2193 if (!UseAsyncConcMarkSweepGC &&
2194 (ExplicitGCInvokesConcurrent ||
2195 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2196 jio_fprintf(defaultStream::error_stream(),
2197 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2198 " with -UseAsyncConcMarkSweepGC");
2199 status = false;
2200 }
2202 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2204 #if INCLUDE_ALL_GCS
2205 if (UseG1GC) {
2206 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2207 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2208 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2210 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2211 "InitiatingHeapOccupancyPercent");
2212 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2213 "G1RefProcDrainInterval");
2214 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2215 "G1ConcMarkStepDurationMillis");
2216 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2217 "G1ConcRSHotCardLimit");
2218 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2219 "G1ConcRSLogCacheSize");
2220 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2221 "StringDeduplicationAgeThreshold");
2222 }
2223 if (UseConcMarkSweepGC) {
2224 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2225 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2226 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2227 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2229 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2231 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2232 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2233 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2235 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2237 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2238 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2240 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2241 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2242 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2244 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2246 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2248 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2249 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2250 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2251 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2252 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2253 }
2255 if (UseParallelGC || UseParallelOldGC) {
2256 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2257 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2259 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2260 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2262 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2263 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2265 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2267 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2268 }
2269 #endif // INCLUDE_ALL_GCS
2271 status = status && verify_interval(RefDiscoveryPolicy,
2272 ReferenceProcessor::DiscoveryPolicyMin,
2273 ReferenceProcessor::DiscoveryPolicyMax,
2274 "RefDiscoveryPolicy");
2276 // Limit the lower bound of this flag to 1 as it is used in a division
2277 // expression.
2278 status = status && verify_interval(TLABWasteTargetPercent,
2279 1, 100, "TLABWasteTargetPercent");
2281 status = status && verify_object_alignment();
2283 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2284 "CompressedClassSpaceSize");
2286 status = status && verify_interval(MarkStackSizeMax,
2287 1, (max_jint - 1), "MarkStackSizeMax");
2288 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2290 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2292 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2294 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2296 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2297 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2299 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2301 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2302 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2303 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2304 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2306 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2307 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2309 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2310 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2311 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2313 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2314 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2316 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2317 // just for that, so hardcode here.
2318 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2319 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2320 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2321 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2323 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2325 if (PrintNMTStatistics) {
2326 #if INCLUDE_NMT
2327 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2328 #endif // INCLUDE_NMT
2329 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2330 PrintNMTStatistics = false;
2331 #if INCLUDE_NMT
2332 }
2333 #endif
2334 }
2336 // Need to limit the extent of the padding to reasonable size.
2337 // 8K is well beyond the reasonable HW cache line size, even with the
2338 // aggressive prefetching, while still leaving the room for segregating
2339 // among the distinct pages.
2340 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2343 ContendedPaddingWidth, 0, 8192);
2344 status = false;
2345 }
2347 // Need to enforce the padding not to break the existing field alignments.
2348 // It is sufficient to check against the largest type size.
2349 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2350 jio_fprintf(defaultStream::error_stream(),
2351 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2352 ContendedPaddingWidth, BytesPerLong);
2353 status = false;
2354 }
2356 // Check lower bounds of the code cache
2357 // Template Interpreter code is approximately 3X larger in debug builds.
2358 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2359 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2360 jio_fprintf(defaultStream::error_stream(),
2361 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2362 os::vm_page_size()/K);
2363 status = false;
2364 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2365 jio_fprintf(defaultStream::error_stream(),
2366 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2367 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2368 status = false;
2369 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2372 min_code_cache_size/K);
2373 status = false;
2374 } else if (ReservedCodeCacheSize > 2*G) {
2375 // Code cache size larger than MAXINT is not supported.
2376 jio_fprintf(defaultStream::error_stream(),
2377 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2378 (2*G)/M);
2379 status = false;
2380 }
2382 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2383 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2385 return status;
2386 }
2388 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2389 const char* option_type) {
2390 if (ignore) return false;
2392 const char* spacer = " ";
2393 if (option_type == NULL) {
2394 option_type = ++spacer; // Set both to the empty string.
2395 }
2397 if (os::obsolete_option(option)) {
2398 jio_fprintf(defaultStream::error_stream(),
2399 "Obsolete %s%soption: %s\n", option_type, spacer,
2400 option->optionString);
2401 return false;
2402 } else {
2403 jio_fprintf(defaultStream::error_stream(),
2404 "Unrecognized %s%soption: %s\n", option_type, spacer,
2405 option->optionString);
2406 return true;
2407 }
2408 }
2410 static const char* user_assertion_options[] = {
2411 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2412 };
2414 static const char* system_assertion_options[] = {
2415 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2416 };
2418 // Return true if any of the strings in null-terminated array 'names' matches.
2419 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2420 // the option must match exactly.
2421 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2422 bool tail_allowed) {
2423 for (/* empty */; *names != NULL; ++names) {
2424 if (match_option(option, *names, tail)) {
2425 if (**tail == '\0' || tail_allowed && **tail == ':') {
2426 return true;
2427 }
2428 }
2429 }
2430 return false;
2431 }
2433 bool Arguments::parse_uintx(const char* value,
2434 uintx* uintx_arg,
2435 uintx min_size) {
2437 // Check the sign first since atomull() parses only unsigned values.
2438 bool value_is_positive = !(*value == '-');
2440 if (value_is_positive) {
2441 julong n;
2442 bool good_return = atomull(value, &n);
2443 if (good_return) {
2444 bool above_minimum = n >= min_size;
2445 bool value_is_too_large = n > max_uintx;
2447 if (above_minimum && !value_is_too_large) {
2448 *uintx_arg = n;
2449 return true;
2450 }
2451 }
2452 }
2453 return false;
2454 }
2456 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2457 julong* long_arg,
2458 julong min_size) {
2459 if (!atomull(s, long_arg)) return arg_unreadable;
2460 return check_memory_size(*long_arg, min_size);
2461 }
2463 // Parse JavaVMInitArgs structure
2465 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2466 // For components of the system classpath.
2467 SysClassPath scp(Arguments::get_sysclasspath());
2468 bool scp_assembly_required = false;
2470 // Save default settings for some mode flags
2471 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2472 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2473 Arguments::_ClipInlining = ClipInlining;
2474 Arguments::_BackgroundCompilation = BackgroundCompilation;
2476 // Setup flags for mixed which is the default
2477 set_mode_flags(_mixed);
2479 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2480 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2481 if (result != JNI_OK) {
2482 return result;
2483 }
2485 // Parse JavaVMInitArgs structure passed in
2486 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2487 if (result != JNI_OK) {
2488 return result;
2489 }
2491 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2492 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2493 if (result != JNI_OK) {
2494 return result;
2495 }
2497 // Do final processing now that all arguments have been parsed
2498 result = finalize_vm_init_args(&scp, scp_assembly_required);
2499 if (result != JNI_OK) {
2500 return result;
2501 }
2503 return JNI_OK;
2504 }
2506 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2507 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2508 // are dealing with -agentpath (case where name is a path), otherwise with
2509 // -agentlib
2510 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2511 char *_name;
2512 const char *_hprof = "hprof", *_jdwp = "jdwp";
2513 size_t _len_hprof, _len_jdwp, _len_prefix;
2515 if (is_path) {
2516 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2517 return false;
2518 }
2520 _name++; // skip past last path separator
2521 _len_prefix = strlen(JNI_LIB_PREFIX);
2523 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2524 return false;
2525 }
2527 _name += _len_prefix;
2528 _len_hprof = strlen(_hprof);
2529 _len_jdwp = strlen(_jdwp);
2531 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2532 _name += _len_hprof;
2533 }
2534 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2535 _name += _len_jdwp;
2536 }
2537 else {
2538 return false;
2539 }
2541 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2542 return false;
2543 }
2545 return true;
2546 }
2548 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2549 return true;
2550 }
2552 return false;
2553 }
2555 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2556 SysClassPath* scp_p,
2557 bool* scp_assembly_required_p,
2558 Flag::Flags origin) {
2559 // Remaining part of option string
2560 const char* tail;
2562 // iterate over arguments
2563 for (int index = 0; index < args->nOptions; index++) {
2564 bool is_absolute_path = false; // for -agentpath vs -agentlib
2566 const JavaVMOption* option = args->options + index;
2568 if (!match_option(option, "-Djava.class.path", &tail) &&
2569 !match_option(option, "-Dsun.java.command", &tail) &&
2570 !match_option(option, "-Dsun.java.launcher", &tail)) {
2572 // add all jvm options to the jvm_args string. This string
2573 // is used later to set the java.vm.args PerfData string constant.
2574 // the -Djava.class.path and the -Dsun.java.command options are
2575 // omitted from jvm_args string as each have their own PerfData
2576 // string constant object.
2577 build_jvm_args(option->optionString);
2578 }
2580 // -verbose:[class/gc/jni]
2581 if (match_option(option, "-verbose", &tail)) {
2582 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2583 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2584 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2585 } else if (!strcmp(tail, ":gc")) {
2586 FLAG_SET_CMDLINE(bool, PrintGC, true);
2587 } else if (!strcmp(tail, ":jni")) {
2588 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2589 }
2590 // -da / -ea / -disableassertions / -enableassertions
2591 // These accept an optional class/package name separated by a colon, e.g.,
2592 // -da:java.lang.Thread.
2593 } else if (match_option(option, user_assertion_options, &tail, true)) {
2594 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2595 if (*tail == '\0') {
2596 JavaAssertions::setUserClassDefault(enable);
2597 } else {
2598 assert(*tail == ':', "bogus match by match_option()");
2599 JavaAssertions::addOption(tail + 1, enable);
2600 }
2601 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2602 } else if (match_option(option, system_assertion_options, &tail, false)) {
2603 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2604 JavaAssertions::setSystemClassDefault(enable);
2605 // -bootclasspath:
2606 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2607 scp_p->reset_path(tail);
2608 *scp_assembly_required_p = true;
2609 // -bootclasspath/a:
2610 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2611 scp_p->add_suffix(tail);
2612 *scp_assembly_required_p = true;
2613 // -bootclasspath/p:
2614 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2615 scp_p->add_prefix(tail);
2616 *scp_assembly_required_p = true;
2617 // -Xrun
2618 } else if (match_option(option, "-Xrun", &tail)) {
2619 if (tail != NULL) {
2620 const char* pos = strchr(tail, ':');
2621 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2622 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2623 name[len] = '\0';
2625 char *options = NULL;
2626 if(pos != NULL) {
2627 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2628 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2629 }
2630 #if !INCLUDE_JVMTI
2631 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2632 jio_fprintf(defaultStream::error_stream(),
2633 "Profiling and debugging agents are not supported in this VM\n");
2634 return JNI_ERR;
2635 }
2636 #endif // !INCLUDE_JVMTI
2637 add_init_library(name, options);
2638 }
2639 // -agentlib and -agentpath
2640 } else if (match_option(option, "-agentlib:", &tail) ||
2641 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2642 if(tail != NULL) {
2643 const char* pos = strchr(tail, '=');
2644 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2645 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2646 name[len] = '\0';
2648 char *options = NULL;
2649 if(pos != NULL) {
2650 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2651 }
2652 #if !INCLUDE_JVMTI
2653 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2654 jio_fprintf(defaultStream::error_stream(),
2655 "Profiling and debugging agents are not supported in this VM\n");
2656 return JNI_ERR;
2657 }
2658 #endif // !INCLUDE_JVMTI
2659 add_init_agent(name, options, is_absolute_path);
2660 }
2661 // -javaagent
2662 } else if (match_option(option, "-javaagent:", &tail)) {
2663 #if !INCLUDE_JVMTI
2664 jio_fprintf(defaultStream::error_stream(),
2665 "Instrumentation agents are not supported in this VM\n");
2666 return JNI_ERR;
2667 #else
2668 if(tail != NULL) {
2669 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2670 add_init_agent("instrument", options, false);
2671 }
2672 #endif // !INCLUDE_JVMTI
2673 // -Xnoclassgc
2674 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2675 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2676 // -Xincgc: i-CMS
2677 } else if (match_option(option, "-Xincgc", &tail)) {
2678 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2679 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2680 // -Xnoincgc: no i-CMS
2681 } else if (match_option(option, "-Xnoincgc", &tail)) {
2682 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2683 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2684 // -Xconcgc
2685 } else if (match_option(option, "-Xconcgc", &tail)) {
2686 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2687 // -Xnoconcgc
2688 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2689 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2690 // -Xbatch
2691 } else if (match_option(option, "-Xbatch", &tail)) {
2692 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2693 // -Xmn for compatibility with other JVM vendors
2694 } else if (match_option(option, "-Xmn", &tail)) {
2695 julong long_initial_young_size = 0;
2696 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2697 if (errcode != arg_in_range) {
2698 jio_fprintf(defaultStream::error_stream(),
2699 "Invalid initial young generation size: %s\n", option->optionString);
2700 describe_range_error(errcode);
2701 return JNI_EINVAL;
2702 }
2703 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2704 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2705 // -Xms
2706 } else if (match_option(option, "-Xms", &tail)) {
2707 julong long_initial_heap_size = 0;
2708 // an initial heap size of 0 means automatically determine
2709 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2710 if (errcode != arg_in_range) {
2711 jio_fprintf(defaultStream::error_stream(),
2712 "Invalid initial heap size: %s\n", option->optionString);
2713 describe_range_error(errcode);
2714 return JNI_EINVAL;
2715 }
2716 set_min_heap_size((uintx)long_initial_heap_size);
2717 // Currently the minimum size and the initial heap sizes are the same.
2718 // Can be overridden with -XX:InitialHeapSize.
2719 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2720 // -Xmx
2721 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2722 julong long_max_heap_size = 0;
2723 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2724 if (errcode != arg_in_range) {
2725 jio_fprintf(defaultStream::error_stream(),
2726 "Invalid maximum heap size: %s\n", option->optionString);
2727 describe_range_error(errcode);
2728 return JNI_EINVAL;
2729 }
2730 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2731 // Xmaxf
2732 } else if (match_option(option, "-Xmaxf", &tail)) {
2733 char* err;
2734 int maxf = (int)(strtod(tail, &err) * 100);
2735 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Bad max heap free percentage size: %s\n",
2738 option->optionString);
2739 return JNI_EINVAL;
2740 } else {
2741 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2742 }
2743 // Xminf
2744 } else if (match_option(option, "-Xminf", &tail)) {
2745 char* err;
2746 int minf = (int)(strtod(tail, &err) * 100);
2747 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2748 jio_fprintf(defaultStream::error_stream(),
2749 "Bad min heap free percentage size: %s\n",
2750 option->optionString);
2751 return JNI_EINVAL;
2752 } else {
2753 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2754 }
2755 // -Xss
2756 } else if (match_option(option, "-Xss", &tail)) {
2757 julong long_ThreadStackSize = 0;
2758 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2759 if (errcode != arg_in_range) {
2760 jio_fprintf(defaultStream::error_stream(),
2761 "Invalid thread stack size: %s\n", option->optionString);
2762 describe_range_error(errcode);
2763 return JNI_EINVAL;
2764 }
2765 // Internally track ThreadStackSize in units of 1024 bytes.
2766 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2767 round_to((int)long_ThreadStackSize, K) / K);
2768 // -Xoss
2769 } else if (match_option(option, "-Xoss", &tail)) {
2770 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2771 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2772 julong long_CodeCacheExpansionSize = 0;
2773 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2774 if (errcode != arg_in_range) {
2775 jio_fprintf(defaultStream::error_stream(),
2776 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2777 os::vm_page_size()/K);
2778 return JNI_EINVAL;
2779 }
2780 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2781 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2782 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2783 julong long_ReservedCodeCacheSize = 0;
2785 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2786 if (errcode != arg_in_range) {
2787 jio_fprintf(defaultStream::error_stream(),
2788 "Invalid maximum code cache size: %s.\n", option->optionString);
2789 return JNI_EINVAL;
2790 }
2791 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2792 //-XX:IncreaseFirstTierCompileThresholdAt=
2793 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2794 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2795 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2798 option->optionString);
2799 return JNI_EINVAL;
2800 }
2801 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2802 // -green
2803 } else if (match_option(option, "-green", &tail)) {
2804 jio_fprintf(defaultStream::error_stream(),
2805 "Green threads support not available\n");
2806 return JNI_EINVAL;
2807 // -native
2808 } else if (match_option(option, "-native", &tail)) {
2809 // HotSpot always uses native threads, ignore silently for compatibility
2810 // -Xsqnopause
2811 } else if (match_option(option, "-Xsqnopause", &tail)) {
2812 // EVM option, ignore silently for compatibility
2813 // -Xrs
2814 } else if (match_option(option, "-Xrs", &tail)) {
2815 // Classic/EVM option, new functionality
2816 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2817 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2818 // change default internal VM signals used - lower case for back compat
2819 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2820 // -Xoptimize
2821 } else if (match_option(option, "-Xoptimize", &tail)) {
2822 // EVM option, ignore silently for compatibility
2823 // -Xprof
2824 } else if (match_option(option, "-Xprof", &tail)) {
2825 #if INCLUDE_FPROF
2826 _has_profile = true;
2827 #else // INCLUDE_FPROF
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Flat profiling is not supported in this VM.\n");
2830 return JNI_ERR;
2831 #endif // INCLUDE_FPROF
2832 // -Xconcurrentio
2833 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2834 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2835 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2836 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2837 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2838 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2840 // -Xinternalversion
2841 } else if (match_option(option, "-Xinternalversion", &tail)) {
2842 jio_fprintf(defaultStream::output_stream(), "%s\n",
2843 VM_Version::internal_vm_info_string());
2844 vm_exit(0);
2845 #ifndef PRODUCT
2846 // -Xprintflags
2847 } else if (match_option(option, "-Xprintflags", &tail)) {
2848 CommandLineFlags::printFlags(tty, false);
2849 vm_exit(0);
2850 #endif
2851 // -D
2852 } else if (match_option(option, "-D", &tail)) {
2853 if (!add_property(tail)) {
2854 return JNI_ENOMEM;
2855 }
2856 // Out of the box management support
2857 if (match_option(option, "-Dcom.sun.management", &tail)) {
2858 #if INCLUDE_MANAGEMENT
2859 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2860 #else
2861 jio_fprintf(defaultStream::output_stream(),
2862 "-Dcom.sun.management is not supported in this VM.\n");
2863 return JNI_ERR;
2864 #endif
2865 }
2866 // -Xint
2867 } else if (match_option(option, "-Xint", &tail)) {
2868 set_mode_flags(_int);
2869 // -Xmixed
2870 } else if (match_option(option, "-Xmixed", &tail)) {
2871 set_mode_flags(_mixed);
2872 // -Xcomp
2873 } else if (match_option(option, "-Xcomp", &tail)) {
2874 // for testing the compiler; turn off all flags that inhibit compilation
2875 set_mode_flags(_comp);
2876 // -Xshare:dump
2877 } else if (match_option(option, "-Xshare:dump", &tail)) {
2878 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2879 set_mode_flags(_int); // Prevent compilation, which creates objects
2880 // -Xshare:on
2881 } else if (match_option(option, "-Xshare:on", &tail)) {
2882 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2883 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2884 // -Xshare:auto
2885 } else if (match_option(option, "-Xshare:auto", &tail)) {
2886 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2887 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2888 // -Xshare:off
2889 } else if (match_option(option, "-Xshare:off", &tail)) {
2890 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2891 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2892 // -Xverify
2893 } else if (match_option(option, "-Xverify", &tail)) {
2894 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2895 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2896 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2897 } else if (strcmp(tail, ":remote") == 0) {
2898 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2899 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2900 } else if (strcmp(tail, ":none") == 0) {
2901 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2902 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2903 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2904 return JNI_EINVAL;
2905 }
2906 // -Xdebug
2907 } else if (match_option(option, "-Xdebug", &tail)) {
2908 // note this flag has been used, then ignore
2909 set_xdebug_mode(true);
2910 // -Xnoagent
2911 } else if (match_option(option, "-Xnoagent", &tail)) {
2912 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2913 } else if (match_option(option, "-Xboundthreads", &tail)) {
2914 // Bind user level threads to kernel threads (Solaris only)
2915 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2916 } else if (match_option(option, "-Xloggc:", &tail)) {
2917 // Redirect GC output to the file. -Xloggc:<filename>
2918 // ostream_init_log(), when called will use this filename
2919 // to initialize a fileStream.
2920 _gc_log_filename = strdup(tail);
2921 if (!is_filename_valid(_gc_log_filename)) {
2922 jio_fprintf(defaultStream::output_stream(),
2923 "Invalid file name for use with -Xloggc: Filename can only contain the "
2924 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2925 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2926 return JNI_EINVAL;
2927 }
2928 FLAG_SET_CMDLINE(bool, PrintGC, true);
2929 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2931 // JNI hooks
2932 } else if (match_option(option, "-Xcheck", &tail)) {
2933 if (!strcmp(tail, ":jni")) {
2934 #if !INCLUDE_JNI_CHECK
2935 warning("JNI CHECKING is not supported in this VM");
2936 #else
2937 CheckJNICalls = true;
2938 #endif // INCLUDE_JNI_CHECK
2939 } else if (is_bad_option(option, args->ignoreUnrecognized,
2940 "check")) {
2941 return JNI_EINVAL;
2942 }
2943 } else if (match_option(option, "vfprintf", &tail)) {
2944 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2945 } else if (match_option(option, "exit", &tail)) {
2946 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2947 } else if (match_option(option, "abort", &tail)) {
2948 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2949 // -XX:+AggressiveHeap
2950 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2952 // This option inspects the machine and attempts to set various
2953 // parameters to be optimal for long-running, memory allocation
2954 // intensive jobs. It is intended for machines with large
2955 // amounts of cpu and memory.
2957 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2958 // VM, but we may not be able to represent the total physical memory
2959 // available (like having 8gb of memory on a box but using a 32bit VM).
2960 // Thus, we need to make sure we're using a julong for intermediate
2961 // calculations.
2962 julong initHeapSize;
2963 julong total_memory = os::physical_memory();
2965 if (total_memory < (julong)256*M) {
2966 jio_fprintf(defaultStream::error_stream(),
2967 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2968 vm_exit(1);
2969 }
2971 // The heap size is half of available memory, or (at most)
2972 // all of possible memory less 160mb (leaving room for the OS
2973 // when using ISM). This is the maximum; because adaptive sizing
2974 // is turned on below, the actual space used may be smaller.
2976 initHeapSize = MIN2(total_memory / (julong)2,
2977 total_memory - (julong)160*M);
2979 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2981 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2982 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2983 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2984 // Currently the minimum size and the initial heap sizes are the same.
2985 set_min_heap_size(initHeapSize);
2986 }
2987 if (FLAG_IS_DEFAULT(NewSize)) {
2988 // Make the young generation 3/8ths of the total heap.
2989 FLAG_SET_CMDLINE(uintx, NewSize,
2990 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2991 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2992 }
2994 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2995 FLAG_SET_DEFAULT(UseLargePages, true);
2996 #endif
2998 // Increase some data structure sizes for efficiency
2999 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3000 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3001 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3003 // See the OldPLABSize comment below, but replace 'after promotion'
3004 // with 'after copying'. YoungPLABSize is the size of the survivor
3005 // space per-gc-thread buffers. The default is 4kw.
3006 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3008 // OldPLABSize is the size of the buffers in the old gen that
3009 // UseParallelGC uses to promote live data that doesn't fit in the
3010 // survivor spaces. At any given time, there's one for each gc thread.
3011 // The default size is 1kw. These buffers are rarely used, since the
3012 // survivor spaces are usually big enough. For specjbb, however, there
3013 // are occasions when there's lots of live data in the young gen
3014 // and we end up promoting some of it. We don't have a definite
3015 // explanation for why bumping OldPLABSize helps, but the theory
3016 // is that a bigger PLAB results in retaining something like the
3017 // original allocation order after promotion, which improves mutator
3018 // locality. A minor effect may be that larger PLABs reduce the
3019 // number of PLAB allocation events during gc. The value of 8kw
3020 // was arrived at by experimenting with specjbb.
3021 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3023 // Enable parallel GC and adaptive generation sizing
3024 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3025 FLAG_SET_DEFAULT(ParallelGCThreads,
3026 Abstract_VM_Version::parallel_worker_threads());
3028 // Encourage steady state memory management
3029 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3031 // This appears to improve mutator locality
3032 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3034 // Get around early Solaris scheduling bug
3035 // (affinity vs other jobs on system)
3036 // but disallow DR and offlining (5008695).
3037 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3039 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3040 // The last option must always win.
3041 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3042 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3043 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3044 // The last option must always win.
3045 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3046 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3047 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3048 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3049 jio_fprintf(defaultStream::error_stream(),
3050 "Please use CMSClassUnloadingEnabled in place of "
3051 "CMSPermGenSweepingEnabled in the future\n");
3052 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3053 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3054 jio_fprintf(defaultStream::error_stream(),
3055 "Please use -XX:+UseGCOverheadLimit in place of "
3056 "-XX:+UseGCTimeLimit in the future\n");
3057 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3058 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3059 jio_fprintf(defaultStream::error_stream(),
3060 "Please use -XX:-UseGCOverheadLimit in place of "
3061 "-XX:-UseGCTimeLimit in the future\n");
3062 // The TLE options are for compatibility with 1.3 and will be
3063 // removed without notice in a future release. These options
3064 // are not to be documented.
3065 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3066 // No longer used.
3067 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3068 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3069 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3070 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3071 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3072 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3073 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3074 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3075 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3076 // No longer used.
3077 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3078 julong long_tlab_size = 0;
3079 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3080 if (errcode != arg_in_range) {
3081 jio_fprintf(defaultStream::error_stream(),
3082 "Invalid TLAB size: %s\n", option->optionString);
3083 describe_range_error(errcode);
3084 return JNI_EINVAL;
3085 }
3086 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3087 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3088 // No longer used.
3089 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3090 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3091 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3092 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3093 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3094 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3095 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3096 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3097 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3098 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3099 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3100 #if defined(DTRACE_ENABLED)
3101 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3102 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3103 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3104 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3105 #else // defined(DTRACE_ENABLED)
3106 jio_fprintf(defaultStream::error_stream(),
3107 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3108 return JNI_EINVAL;
3109 #endif // defined(DTRACE_ENABLED)
3110 #ifdef ASSERT
3111 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3112 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3113 // disable scavenge before parallel mark-compact
3114 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3115 #endif
3116 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3117 julong cms_blocks_to_claim = (julong)atol(tail);
3118 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3119 jio_fprintf(defaultStream::error_stream(),
3120 "Please use -XX:OldPLABSize in place of "
3121 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3122 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3123 julong cms_blocks_to_claim = (julong)atol(tail);
3124 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3125 jio_fprintf(defaultStream::error_stream(),
3126 "Please use -XX:OldPLABSize in place of "
3127 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3128 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3129 julong old_plab_size = 0;
3130 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3131 if (errcode != arg_in_range) {
3132 jio_fprintf(defaultStream::error_stream(),
3133 "Invalid old PLAB size: %s\n", option->optionString);
3134 describe_range_error(errcode);
3135 return JNI_EINVAL;
3136 }
3137 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3138 jio_fprintf(defaultStream::error_stream(),
3139 "Please use -XX:OldPLABSize in place of "
3140 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3141 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3142 julong young_plab_size = 0;
3143 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3144 if (errcode != arg_in_range) {
3145 jio_fprintf(defaultStream::error_stream(),
3146 "Invalid young PLAB size: %s\n", option->optionString);
3147 describe_range_error(errcode);
3148 return JNI_EINVAL;
3149 }
3150 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3151 jio_fprintf(defaultStream::error_stream(),
3152 "Please use -XX:YoungPLABSize in place of "
3153 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3154 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3155 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3156 julong stack_size = 0;
3157 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3158 if (errcode != arg_in_range) {
3159 jio_fprintf(defaultStream::error_stream(),
3160 "Invalid mark stack size: %s\n", option->optionString);
3161 describe_range_error(errcode);
3162 return JNI_EINVAL;
3163 }
3164 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3165 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3166 julong max_stack_size = 0;
3167 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3168 if (errcode != arg_in_range) {
3169 jio_fprintf(defaultStream::error_stream(),
3170 "Invalid maximum mark stack size: %s\n",
3171 option->optionString);
3172 describe_range_error(errcode);
3173 return JNI_EINVAL;
3174 }
3175 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3176 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3177 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3178 uintx conc_threads = 0;
3179 if (!parse_uintx(tail, &conc_threads, 1)) {
3180 jio_fprintf(defaultStream::error_stream(),
3181 "Invalid concurrent threads: %s\n", option->optionString);
3182 return JNI_EINVAL;
3183 }
3184 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3185 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3186 julong max_direct_memory_size = 0;
3187 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3188 if (errcode != arg_in_range) {
3189 jio_fprintf(defaultStream::error_stream(),
3190 "Invalid maximum direct memory size: %s\n",
3191 option->optionString);
3192 describe_range_error(errcode);
3193 return JNI_EINVAL;
3194 }
3195 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3196 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3197 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3198 // away and will cause VM initialization failures!
3199 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3200 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3201 #if !INCLUDE_MANAGEMENT
3202 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3203 jio_fprintf(defaultStream::error_stream(),
3204 "ManagementServer is not supported in this VM.\n");
3205 return JNI_ERR;
3206 #endif // INCLUDE_MANAGEMENT
3207 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3208 // Skip -XX:Flags= since that case has already been handled
3209 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3210 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3211 return JNI_EINVAL;
3212 }
3213 }
3214 // Unknown option
3215 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3216 return JNI_ERR;
3217 }
3218 }
3220 // Change the default value for flags which have different default values
3221 // when working with older JDKs.
3222 #ifdef LINUX
3223 if (JDK_Version::current().compare_major(6) <= 0 &&
3224 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3225 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3226 }
3227 #endif // LINUX
3228 return JNI_OK;
3229 }
3231 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3232 // This must be done after all -D arguments have been processed.
3233 scp_p->expand_endorsed();
3235 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3236 // Assemble the bootclasspath elements into the final path.
3237 Arguments::set_sysclasspath(scp_p->combined_path());
3238 }
3240 // This must be done after all arguments have been processed.
3241 // java_compiler() true means set to "NONE" or empty.
3242 if (java_compiler() && !xdebug_mode()) {
3243 // For backwards compatibility, we switch to interpreted mode if
3244 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3245 // not specified.
3246 set_mode_flags(_int);
3247 }
3248 if (CompileThreshold == 0) {
3249 set_mode_flags(_int);
3250 }
3252 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3253 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3254 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3255 }
3257 #ifndef COMPILER2
3258 // Don't degrade server performance for footprint
3259 if (FLAG_IS_DEFAULT(UseLargePages) &&
3260 MaxHeapSize < LargePageHeapSizeThreshold) {
3261 // No need for large granularity pages w/small heaps.
3262 // Note that large pages are enabled/disabled for both the
3263 // Java heap and the code cache.
3264 FLAG_SET_DEFAULT(UseLargePages, false);
3265 }
3267 #else
3268 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3269 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3270 }
3271 #endif
3273 #ifndef TIERED
3274 // Tiered compilation is undefined.
3275 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3276 #endif
3278 // If we are running in a headless jre, force java.awt.headless property
3279 // to be true unless the property has already been set.
3280 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3281 if (os::is_headless_jre()) {
3282 const char* headless = Arguments::get_property("java.awt.headless");
3283 if (headless == NULL) {
3284 char envbuffer[128];
3285 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3286 if (!add_property("java.awt.headless=true")) {
3287 return JNI_ENOMEM;
3288 }
3289 } else {
3290 char buffer[256];
3291 strcpy(buffer, "java.awt.headless=");
3292 strcat(buffer, envbuffer);
3293 if (!add_property(buffer)) {
3294 return JNI_ENOMEM;
3295 }
3296 }
3297 }
3298 }
3300 if (!check_vm_args_consistency()) {
3301 return JNI_ERR;
3302 }
3304 return JNI_OK;
3305 }
3307 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3308 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3309 scp_assembly_required_p);
3310 }
3312 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3313 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3314 scp_assembly_required_p);
3315 }
3317 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3318 const int N_MAX_OPTIONS = 64;
3319 const int OPTION_BUFFER_SIZE = 1024;
3320 char buffer[OPTION_BUFFER_SIZE];
3322 // The variable will be ignored if it exceeds the length of the buffer.
3323 // Don't check this variable if user has special privileges
3324 // (e.g. unix su command).
3325 if (os::getenv(name, buffer, sizeof(buffer)) &&
3326 !os::have_special_privileges()) {
3327 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3328 jio_fprintf(defaultStream::error_stream(),
3329 "Picked up %s: %s\n", name, buffer);
3330 char* rd = buffer; // pointer to the input string (rd)
3331 int i;
3332 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3333 while (isspace(*rd)) rd++; // skip whitespace
3334 if (*rd == 0) break; // we re done when the input string is read completely
3336 // The output, option string, overwrites the input string.
3337 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3338 // input string (rd).
3339 char* wrt = rd;
3341 options[i++].optionString = wrt; // Fill in option
3342 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3343 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3344 int quote = *rd; // matching quote to look for
3345 rd++; // don't copy open quote
3346 while (*rd != quote) { // include everything (even spaces) up until quote
3347 if (*rd == 0) { // string termination means unmatched string
3348 jio_fprintf(defaultStream::error_stream(),
3349 "Unmatched quote in %s\n", name);
3350 return JNI_ERR;
3351 }
3352 *wrt++ = *rd++; // copy to option string
3353 }
3354 rd++; // don't copy close quote
3355 } else {
3356 *wrt++ = *rd++; // copy to option string
3357 }
3358 }
3359 // Need to check if we're done before writing a NULL,
3360 // because the write could be to the byte that rd is pointing to.
3361 if (*rd++ == 0) {
3362 *wrt = 0;
3363 break;
3364 }
3365 *wrt = 0; // Zero terminate option
3366 }
3367 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3368 JavaVMInitArgs vm_args;
3369 vm_args.version = JNI_VERSION_1_2;
3370 vm_args.options = options;
3371 vm_args.nOptions = i;
3372 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3374 if (PrintVMOptions) {
3375 const char* tail;
3376 for (int i = 0; i < vm_args.nOptions; i++) {
3377 const JavaVMOption *option = vm_args.options + i;
3378 if (match_option(option, "-XX:", &tail)) {
3379 logOption(tail);
3380 }
3381 }
3382 }
3384 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3385 }
3386 return JNI_OK;
3387 }
3389 void Arguments::set_shared_spaces_flags() {
3390 if (DumpSharedSpaces) {
3391 if (RequireSharedSpaces) {
3392 warning("cannot dump shared archive while using shared archive");
3393 }
3394 UseSharedSpaces = false;
3395 #ifdef _LP64
3396 if (!UseCompressedOops || !UseCompressedClassPointers) {
3397 vm_exit_during_initialization(
3398 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3399 }
3400 } else {
3401 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3402 if (!UseCompressedOops || !UseCompressedClassPointers) {
3403 no_shared_spaces();
3404 }
3405 #endif
3406 }
3407 }
3409 #if !INCLUDE_ALL_GCS
3410 static void force_serial_gc() {
3411 FLAG_SET_DEFAULT(UseSerialGC, true);
3412 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3413 UNSUPPORTED_GC_OPTION(UseG1GC);
3414 UNSUPPORTED_GC_OPTION(UseParallelGC);
3415 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3416 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3417 UNSUPPORTED_GC_OPTION(UseParNewGC);
3418 }
3419 #endif // INCLUDE_ALL_GCS
3421 // Sharing support
3422 // Construct the path to the archive
3423 static char* get_shared_archive_path() {
3424 char *shared_archive_path;
3425 if (SharedArchiveFile == NULL) {
3426 char jvm_path[JVM_MAXPATHLEN];
3427 os::jvm_path(jvm_path, sizeof(jvm_path));
3428 char *end = strrchr(jvm_path, *os::file_separator());
3429 if (end != NULL) *end = '\0';
3430 size_t jvm_path_len = strlen(jvm_path);
3431 size_t file_sep_len = strlen(os::file_separator());
3432 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3433 file_sep_len + 20, mtInternal);
3434 if (shared_archive_path != NULL) {
3435 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3436 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3437 strncat(shared_archive_path, "classes.jsa", 11);
3438 }
3439 } else {
3440 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3441 if (shared_archive_path != NULL) {
3442 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3443 }
3444 }
3445 return shared_archive_path;
3446 }
3448 #ifndef PRODUCT
3449 // Determine whether LogVMOutput should be implicitly turned on.
3450 static bool use_vm_log() {
3451 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3452 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3453 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3454 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3455 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3456 return true;
3457 }
3459 #ifdef COMPILER1
3460 if (PrintC1Statistics) {
3461 return true;
3462 }
3463 #endif // COMPILER1
3465 #ifdef COMPILER2
3466 if (PrintOptoAssembly || PrintOptoStatistics) {
3467 return true;
3468 }
3469 #endif // COMPILER2
3471 return false;
3472 }
3473 #endif // PRODUCT
3475 // Parse entry point called from JNI_CreateJavaVM
3477 jint Arguments::parse(const JavaVMInitArgs* args) {
3479 // Remaining part of option string
3480 const char* tail;
3482 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3483 const char* hotspotrc = ".hotspotrc";
3484 bool settings_file_specified = false;
3485 bool needs_hotspotrc_warning = false;
3487 const char* flags_file;
3488 int index;
3489 for (index = 0; index < args->nOptions; index++) {
3490 const JavaVMOption *option = args->options + index;
3491 if (match_option(option, "-XX:Flags=", &tail)) {
3492 flags_file = tail;
3493 settings_file_specified = true;
3494 }
3495 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3496 PrintVMOptions = true;
3497 }
3498 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3499 PrintVMOptions = false;
3500 }
3501 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3502 IgnoreUnrecognizedVMOptions = true;
3503 }
3504 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3505 IgnoreUnrecognizedVMOptions = false;
3506 }
3507 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3508 CommandLineFlags::printFlags(tty, false);
3509 vm_exit(0);
3510 }
3511 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3512 #if INCLUDE_NMT
3513 MemTracker::init_tracking_options(tail);
3514 #else
3515 jio_fprintf(defaultStream::error_stream(),
3516 "Native Memory Tracking is not supported in this VM\n");
3517 return JNI_ERR;
3518 #endif
3519 }
3522 #ifndef PRODUCT
3523 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3524 CommandLineFlags::printFlags(tty, true);
3525 vm_exit(0);
3526 }
3527 #endif
3528 }
3530 if (IgnoreUnrecognizedVMOptions) {
3531 // uncast const to modify the flag args->ignoreUnrecognized
3532 *(jboolean*)(&args->ignoreUnrecognized) = true;
3533 }
3535 // Parse specified settings file
3536 if (settings_file_specified) {
3537 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3538 return JNI_EINVAL;
3539 }
3540 } else {
3541 #ifdef ASSERT
3542 // Parse default .hotspotrc settings file
3543 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3544 return JNI_EINVAL;
3545 }
3546 #else
3547 struct stat buf;
3548 if (os::stat(hotspotrc, &buf) == 0) {
3549 needs_hotspotrc_warning = true;
3550 }
3551 #endif
3552 }
3554 if (PrintVMOptions) {
3555 for (index = 0; index < args->nOptions; index++) {
3556 const JavaVMOption *option = args->options + index;
3557 if (match_option(option, "-XX:", &tail)) {
3558 logOption(tail);
3559 }
3560 }
3561 }
3563 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3564 jint result = parse_vm_init_args(args);
3565 if (result != JNI_OK) {
3566 return result;
3567 }
3569 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3570 SharedArchivePath = get_shared_archive_path();
3571 if (SharedArchivePath == NULL) {
3572 return JNI_ENOMEM;
3573 }
3575 // Delay warning until here so that we've had a chance to process
3576 // the -XX:-PrintWarnings flag
3577 if (needs_hotspotrc_warning) {
3578 warning("%s file is present but has been ignored. "
3579 "Run with -XX:Flags=%s to load the file.",
3580 hotspotrc, hotspotrc);
3581 }
3583 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3584 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3585 #endif
3587 #if INCLUDE_ALL_GCS
3588 #if (defined JAVASE_EMBEDDED || defined ARM)
3589 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3590 #endif
3591 #endif
3593 #ifndef PRODUCT
3594 if (TraceBytecodesAt != 0) {
3595 TraceBytecodes = true;
3596 }
3597 if (CountCompiledCalls) {
3598 if (UseCounterDecay) {
3599 warning("UseCounterDecay disabled because CountCalls is set");
3600 UseCounterDecay = false;
3601 }
3602 }
3603 #endif // PRODUCT
3605 // JSR 292 is not supported before 1.7
3606 if (!JDK_Version::is_gte_jdk17x_version()) {
3607 if (EnableInvokeDynamic) {
3608 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3609 warning("JSR 292 is not supported before 1.7. Disabling support.");
3610 }
3611 EnableInvokeDynamic = false;
3612 }
3613 }
3615 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3616 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3617 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3618 }
3619 ScavengeRootsInCode = 1;
3620 }
3622 if (PrintGCDetails) {
3623 // Turn on -verbose:gc options as well
3624 PrintGC = true;
3625 }
3627 if (!JDK_Version::is_gte_jdk18x_version()) {
3628 // To avoid changing the log format for 7 updates this flag is only
3629 // true by default in JDK8 and above.
3630 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3631 FLAG_SET_DEFAULT(PrintGCCause, false);
3632 }
3633 }
3635 // Set object alignment values.
3636 set_object_alignment();
3638 #if !INCLUDE_ALL_GCS
3639 force_serial_gc();
3640 #endif // INCLUDE_ALL_GCS
3641 #if !INCLUDE_CDS
3642 if (DumpSharedSpaces || RequireSharedSpaces) {
3643 jio_fprintf(defaultStream::error_stream(),
3644 "Shared spaces are not supported in this VM\n");
3645 return JNI_ERR;
3646 }
3647 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3648 warning("Shared spaces are not supported in this VM");
3649 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3650 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3651 }
3652 no_shared_spaces();
3653 #endif // INCLUDE_CDS
3655 return JNI_OK;
3656 }
3658 jint Arguments::apply_ergo() {
3660 // Set flags based on ergonomics.
3661 set_ergonomics_flags();
3663 set_shared_spaces_flags();
3665 // Check the GC selections again.
3666 if (!check_gc_consistency()) {
3667 return JNI_EINVAL;
3668 }
3670 if (TieredCompilation) {
3671 set_tiered_flags();
3672 } else {
3673 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3674 if (CompilationPolicyChoice >= 2) {
3675 vm_exit_during_initialization(
3676 "Incompatible compilation policy selected", NULL);
3677 }
3678 }
3679 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3680 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3681 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3682 }
3685 // Set heap size based on available physical memory
3686 set_heap_size();
3688 #if INCLUDE_ALL_GCS
3689 // Set per-collector flags
3690 if (UseParallelGC || UseParallelOldGC) {
3691 set_parallel_gc_flags();
3692 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3693 set_cms_and_parnew_gc_flags();
3694 } else if (UseParNewGC) { // Skipped if CMS is set above
3695 set_parnew_gc_flags();
3696 } else if (UseG1GC) {
3697 set_g1_gc_flags();
3698 }
3699 check_deprecated_gcs();
3700 check_deprecated_gc_flags();
3701 if (AssumeMP && !UseSerialGC) {
3702 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3703 warning("If the number of processors is expected to increase from one, then"
3704 " you should configure the number of parallel GC threads appropriately"
3705 " using -XX:ParallelGCThreads=N");
3706 }
3707 }
3708 if (MinHeapFreeRatio == 100) {
3709 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3710 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3711 }
3712 #else // INCLUDE_ALL_GCS
3713 assert(verify_serial_gc_flags(), "SerialGC unset");
3714 #endif // INCLUDE_ALL_GCS
3716 // Initialize Metaspace flags and alignments.
3717 Metaspace::ergo_initialize();
3719 // Set bytecode rewriting flags
3720 set_bytecode_flags();
3722 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3723 set_aggressive_opts_flags();
3725 // Turn off biased locking for locking debug mode flags,
3726 // which are subtlely different from each other but neither works with
3727 // biased locking.
3728 if (UseHeavyMonitors
3729 #ifdef COMPILER1
3730 || !UseFastLocking
3731 #endif // COMPILER1
3732 ) {
3733 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3734 // flag set to true on command line; warn the user that they
3735 // can't enable biased locking here
3736 warning("Biased Locking is not supported with locking debug flags"
3737 "; ignoring UseBiasedLocking flag." );
3738 }
3739 UseBiasedLocking = false;
3740 }
3742 #ifdef CC_INTERP
3743 // Clear flags not supported by the C++ interpreter
3744 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3745 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3746 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3747 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3748 #endif // CC_INTERP
3750 #ifdef COMPILER2
3751 if (!UseBiasedLocking || EmitSync != 0) {
3752 UseOptoBiasInlining = false;
3753 }
3754 if (!EliminateLocks) {
3755 EliminateNestedLocks = false;
3756 }
3757 if (!Inline) {
3758 IncrementalInline = false;
3759 }
3760 #ifndef PRODUCT
3761 if (!IncrementalInline) {
3762 AlwaysIncrementalInline = false;
3763 }
3764 #endif
3765 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3766 // incremental inlining: bump MaxNodeLimit
3767 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3768 }
3769 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3770 // nothing to use the profiling, turn if off
3771 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3772 }
3773 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3774 // Doing the replace in parent maps helps speculation
3775 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3776 }
3777 #endif
3779 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3780 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3781 DebugNonSafepoints = true;
3782 }
3784 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3785 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3786 }
3788 #ifndef PRODUCT
3789 if (CompileTheWorld) {
3790 // Force NmethodSweeper to sweep whole CodeCache each time.
3791 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3792 NmethodSweepFraction = 1;
3793 }
3794 }
3796 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3797 if (use_vm_log()) {
3798 LogVMOutput = true;
3799 }
3800 }
3801 #endif // PRODUCT
3803 if (PrintCommandLineFlags) {
3804 CommandLineFlags::printSetFlags(tty);
3805 }
3807 // Apply CPU specific policy for the BiasedLocking
3808 if (UseBiasedLocking) {
3809 if (!VM_Version::use_biased_locking() &&
3810 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3811 UseBiasedLocking = false;
3812 }
3813 }
3815 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3816 // but only if not already set on the commandline
3817 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3818 bool set = false;
3819 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3820 if (!set) {
3821 FLAG_SET_DEFAULT(PauseAtExit, true);
3822 }
3823 }
3825 return JNI_OK;
3826 }
3828 jint Arguments::adjust_after_os() {
3829 #if INCLUDE_ALL_GCS
3830 if (UseParallelGC || UseParallelOldGC) {
3831 if (UseNUMA) {
3832 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3833 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3834 }
3835 // For those collectors or operating systems (eg, Windows) that do
3836 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3837 UseNUMAInterleaving = true;
3838 }
3839 }
3840 #endif // INCLUDE_ALL_GCS
3841 return JNI_OK;
3842 }
3844 int Arguments::PropertyList_count(SystemProperty* pl) {
3845 int count = 0;
3846 while(pl != NULL) {
3847 count++;
3848 pl = pl->next();
3849 }
3850 return count;
3851 }
3853 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3854 assert(key != NULL, "just checking");
3855 SystemProperty* prop;
3856 for (prop = pl; prop != NULL; prop = prop->next()) {
3857 if (strcmp(key, prop->key()) == 0) return prop->value();
3858 }
3859 return NULL;
3860 }
3862 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3863 int count = 0;
3864 const char* ret_val = NULL;
3866 while(pl != NULL) {
3867 if(count >= index) {
3868 ret_val = pl->key();
3869 break;
3870 }
3871 count++;
3872 pl = pl->next();
3873 }
3875 return ret_val;
3876 }
3878 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3879 int count = 0;
3880 char* ret_val = NULL;
3882 while(pl != NULL) {
3883 if(count >= index) {
3884 ret_val = pl->value();
3885 break;
3886 }
3887 count++;
3888 pl = pl->next();
3889 }
3891 return ret_val;
3892 }
3894 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3895 SystemProperty* p = *plist;
3896 if (p == NULL) {
3897 *plist = new_p;
3898 } else {
3899 while (p->next() != NULL) {
3900 p = p->next();
3901 }
3902 p->set_next(new_p);
3903 }
3904 }
3906 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3907 if (plist == NULL)
3908 return;
3910 SystemProperty* new_p = new SystemProperty(k, v, true);
3911 PropertyList_add(plist, new_p);
3912 }
3914 // This add maintains unique property key in the list.
3915 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3916 if (plist == NULL)
3917 return;
3919 // If property key exist then update with new value.
3920 SystemProperty* prop;
3921 for (prop = *plist; prop != NULL; prop = prop->next()) {
3922 if (strcmp(k, prop->key()) == 0) {
3923 if (append) {
3924 prop->append_value(v);
3925 } else {
3926 prop->set_value(v);
3927 }
3928 return;
3929 }
3930 }
3932 PropertyList_add(plist, k, v);
3933 }
3935 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3936 // Returns true if all of the source pointed by src has been copied over to
3937 // the destination buffer pointed by buf. Otherwise, returns false.
3938 // Notes:
3939 // 1. If the length (buflen) of the destination buffer excluding the
3940 // NULL terminator character is not long enough for holding the expanded
3941 // pid characters, it also returns false instead of returning the partially
3942 // expanded one.
3943 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3944 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3945 char* buf, size_t buflen) {
3946 const char* p = src;
3947 char* b = buf;
3948 const char* src_end = &src[srclen];
3949 char* buf_end = &buf[buflen - 1];
3951 while (p < src_end && b < buf_end) {
3952 if (*p == '%') {
3953 switch (*(++p)) {
3954 case '%': // "%%" ==> "%"
3955 *b++ = *p++;
3956 break;
3957 case 'p': { // "%p" ==> current process id
3958 // buf_end points to the character before the last character so
3959 // that we could write '\0' to the end of the buffer.
3960 size_t buf_sz = buf_end - b + 1;
3961 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3963 // if jio_snprintf fails or the buffer is not long enough to hold
3964 // the expanded pid, returns false.
3965 if (ret < 0 || ret >= (int)buf_sz) {
3966 return false;
3967 } else {
3968 b += ret;
3969 assert(*b == '\0', "fail in copy_expand_pid");
3970 if (p == src_end && b == buf_end + 1) {
3971 // reach the end of the buffer.
3972 return true;
3973 }
3974 }
3975 p++;
3976 break;
3977 }
3978 default :
3979 *b++ = '%';
3980 }
3981 } else {
3982 *b++ = *p++;
3983 }
3984 }
3985 *b = '\0';
3986 return (p == src_end); // return false if not all of the source was copied
3987 }