1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/globals_extension.hpp"
39 #include "runtime/java.hpp"
40 #include "services/management.hpp"
41 #include "services/memTracker.hpp"
42 #include "utilities/defaultStream.hpp"
43 #include "utilities/macros.hpp"
44 #include "utilities/taskqueue.hpp"
45 #ifdef TARGET_OS_FAMILY_linux
46 # include "os_linux.inline.hpp"
47 #endif
48 #ifdef TARGET_OS_FAMILY_solaris
49 # include "os_solaris.inline.hpp"
50 #endif
51 #ifdef TARGET_OS_FAMILY_windows
52 # include "os_windows.inline.hpp"
53 #endif
54 #ifdef TARGET_OS_FAMILY_aix
55 # include "os_aix.inline.hpp"
56 #endif
57 #ifdef TARGET_OS_FAMILY_bsd
58 # include "os_bsd.inline.hpp"
59 #endif
60 #if INCLUDE_ALL_GCS
61 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
62 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
63 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
64 #endif // INCLUDE_ALL_GCS
65
66 // Note: This is a special bug reporting site for the JVM
67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
68 #define DEFAULT_JAVA_LAUNCHER "generic"
69
70 // Disable options not supported in this release, with a warning if they
71 // were explicitly requested on the command-line
72 #define UNSUPPORTED_OPTION(opt, description) \
73 do { \
74 if (opt) { \
75 if (FLAG_IS_CMDLINE(opt)) { \
76 warning(description " is disabled in this release."); \
77 } \
78 FLAG_SET_DEFAULT(opt, false); \
79 } \
80 } while(0)
81
82 #define UNSUPPORTED_GC_OPTION(gc) \
83 do { \
84 if (gc) { \
85 if (FLAG_IS_CMDLINE(gc)) { \
86 warning(#gc " is not supported in this VM. Using Serial GC."); \
87 } \
88 FLAG_SET_DEFAULT(gc, false); \
89 } \
90 } while(0)
91
92 char** Arguments::_jvm_flags_array = NULL;
93 int Arguments::_num_jvm_flags = 0;
94 char** Arguments::_jvm_args_array = NULL;
95 int Arguments::_num_jvm_args = 0;
96 char* Arguments::_java_command = NULL;
97 SystemProperty* Arguments::_system_properties = NULL;
98 const char* Arguments::_gc_log_filename = NULL;
99 bool Arguments::_has_profile = false;
100 size_t Arguments::_conservative_max_heap_alignment = 0;
101 uintx Arguments::_min_heap_size = 0;
102 Arguments::Mode Arguments::_mode = _mixed;
103 bool Arguments::_java_compiler = false;
104 bool Arguments::_xdebug_mode = false;
105 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
106 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
107 int Arguments::_sun_java_launcher_pid = -1;
108 bool Arguments::_sun_java_launcher_is_altjvm = false;
109
110 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
111 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
112 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
113 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
114 bool Arguments::_ClipInlining = ClipInlining;
115
116 char* Arguments::SharedArchivePath = NULL;
117
118 AgentLibraryList Arguments::_libraryList;
119 AgentLibraryList Arguments::_agentList;
120
121 abort_hook_t Arguments::_abort_hook = NULL;
122 exit_hook_t Arguments::_exit_hook = NULL;
123 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
124
125
126 SystemProperty *Arguments::_java_ext_dirs = NULL;
127 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
128 SystemProperty *Arguments::_sun_boot_library_path = NULL;
129 SystemProperty *Arguments::_java_library_path = NULL;
130 SystemProperty *Arguments::_java_home = NULL;
131 SystemProperty *Arguments::_java_class_path = NULL;
132 SystemProperty *Arguments::_sun_boot_class_path = NULL;
133
134 char* Arguments::_meta_index_path = NULL;
135 char* Arguments::_meta_index_dir = NULL;
136
137 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
138
139 static bool match_option(const JavaVMOption *option, const char* name,
140 const char** tail) {
141 int len = (int)strlen(name);
142 if (strncmp(option->optionString, name, len) == 0) {
143 *tail = option->optionString + len;
144 return true;
145 } else {
146 return false;
147 }
148 }
149
150 static void logOption(const char* opt) {
151 if (PrintVMOptions) {
152 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
153 }
154 }
155
156 // Process java launcher properties.
157 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
158 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
159 // sun.java.launcher.pid is defined.
160 // Must do this before setting up other system properties,
161 // as some of them may depend on launcher type.
162 for (int index = 0; index < args->nOptions; index++) {
163 const JavaVMOption* option = args->options + index;
164 const char* tail;
165
166 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
167 process_java_launcher_argument(tail, option->extraInfo);
168 continue;
169 }
170 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
171 if (strcmp(tail, "true") == 0) {
172 _sun_java_launcher_is_altjvm = true;
173 }
174 continue;
175 }
176 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
177 _sun_java_launcher_pid = atoi(tail);
178 continue;
179 }
180 }
181 }
182
183 // Initialize system properties key and value.
184 void Arguments::init_system_properties() {
185
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
187 "Java Virtual Machine Specification", false));
188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
190 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
191
192 // Following are JVMTI agent writable properties.
193 // Properties values are set to NULL and they are
194 // os specific they are initialized in os::init_system_properties_values().
195 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
196 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
197 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
198 _java_library_path = new SystemProperty("java.library.path", NULL, true);
199 _java_home = new SystemProperty("java.home", NULL, true);
200 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
201
202 _java_class_path = new SystemProperty("java.class.path", "", true);
203
204 // Add to System Property list.
205 PropertyList_add(&_system_properties, _java_ext_dirs);
206 PropertyList_add(&_system_properties, _java_endorsed_dirs);
207 PropertyList_add(&_system_properties, _sun_boot_library_path);
208 PropertyList_add(&_system_properties, _java_library_path);
209 PropertyList_add(&_system_properties, _java_home);
210 PropertyList_add(&_system_properties, _java_class_path);
211 PropertyList_add(&_system_properties, _sun_boot_class_path);
212
213 // Set OS specific system properties values
214 os::init_system_properties_values();
215 }
216
217
218 // Update/Initialize System properties after JDK version number is known
219 void Arguments::init_version_specific_system_properties() {
220 enum { bufsz = 16 };
221 char buffer[bufsz];
222 const char* spec_vendor = "Sun Microsystems Inc.";
223 uint32_t spec_version = 0;
224
225 if (JDK_Version::is_gte_jdk17x_version()) {
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
228 }
229 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
230
231 PropertyList_add(&_system_properties,
232 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
233 PropertyList_add(&_system_properties,
234 new SystemProperty("java.vm.specification.version", buffer, false));
235 PropertyList_add(&_system_properties,
236 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
237 }
238
239 /**
240 * Provide a slightly more user-friendly way of eliminating -XX flags.
241 * When a flag is eliminated, it can be added to this list in order to
242 * continue accepting this flag on the command-line, while issuing a warning
243 * and ignoring the value. Once the JDK version reaches the 'accept_until'
244 * limit, we flatly refuse to admit the existence of the flag. This allows
245 * a flag to die correctly over JDK releases using HSX.
246 */
247 typedef struct {
248 const char* name;
249 JDK_Version obsoleted_in; // when the flag went away
250 JDK_Version accept_until; // which version to start denying the existence
251 } ObsoleteFlag;
252
253 static ObsoleteFlag obsolete_jvm_flags[] = {
254 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
267 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
268 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
269 { "DefaultInitialRAMFraction",
270 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
271 { "UseDepthFirstScavengeOrder",
272 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
273 { "HandlePromotionFailure",
274 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
275 { "MaxLiveObjectEvacuationRatio",
276 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
277 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
278 { "UseParallelOldGCCompacting",
279 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
280 { "UseParallelDensePrefixUpdate",
281 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
282 { "UseParallelOldGCDensePrefix",
283 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
284 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
285 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
286 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 #ifdef PRODUCT
307 { "DesiredMethodLimit",
308 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
309 #endif // PRODUCT
310 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
315 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
316 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
317 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
318 { NULL, JDK_Version(0), JDK_Version(0) }
319 };
320
321 // Returns true if the flag is obsolete and fits into the range specified
322 // for being ignored. In the case that the flag is ignored, the 'version'
323 // value is filled in with the version number when the flag became
324 // obsolete so that that value can be displayed to the user.
325 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
326 int i = 0;
327 assert(version != NULL, "Must provide a version buffer");
328 while (obsolete_jvm_flags[i].name != NULL) {
329 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
330 // <flag>=xxx form
331 // [-|+]<flag> form
332 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
333 ((s[0] == '+' || s[0] == '-') &&
334 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
335 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
336 *version = flag_status.obsoleted_in;
337 return true;
338 }
339 }
340 i++;
341 }
342 return false;
343 }
344
345 // Constructs the system class path (aka boot class path) from the following
346 // components, in order:
347 //
348 // prefix // from -Xbootclasspath/p:...
349 // endorsed // the expansion of -Djava.endorsed.dirs=...
350 // base // from os::get_system_properties() or -Xbootclasspath=
351 // suffix // from -Xbootclasspath/a:...
352 //
353 // java.endorsed.dirs is a list of directories; any jar or zip files in the
354 // directories are added to the sysclasspath just before the base.
355 //
356 // This could be AllStatic, but it isn't needed after argument processing is
357 // complete.
358 class SysClassPath: public StackObj {
359 public:
360 SysClassPath(const char* base);
361 ~SysClassPath();
362
363 inline void set_base(const char* base);
364 inline void add_prefix(const char* prefix);
365 inline void add_suffix_to_prefix(const char* suffix);
366 inline void add_suffix(const char* suffix);
367 inline void reset_path(const char* base);
368
369 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
370 // property. Must be called after all command-line arguments have been
371 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
372 // combined_path().
373 void expand_endorsed();
374
375 inline const char* get_base() const { return _items[_scp_base]; }
376 inline const char* get_prefix() const { return _items[_scp_prefix]; }
377 inline const char* get_suffix() const { return _items[_scp_suffix]; }
378 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
379
380 // Combine all the components into a single c-heap-allocated string; caller
381 // must free the string if/when no longer needed.
382 char* combined_path();
383
384 private:
385 // Utility routines.
386 static char* add_to_path(const char* path, const char* str, bool prepend);
387 static char* add_jars_to_path(char* path, const char* directory);
388
389 inline void reset_item_at(int index);
390
391 // Array indices for the items that make up the sysclasspath. All except the
392 // base are allocated in the C heap and freed by this class.
393 enum {
394 _scp_prefix, // from -Xbootclasspath/p:...
395 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
396 _scp_base, // the default sysclasspath
397 _scp_suffix, // from -Xbootclasspath/a:...
398 _scp_nitems // the number of items, must be last.
399 };
400
401 const char* _items[_scp_nitems];
402 DEBUG_ONLY(bool _expansion_done;)
403 };
404
405 SysClassPath::SysClassPath(const char* base) {
406 memset(_items, 0, sizeof(_items));
407 _items[_scp_base] = base;
408 DEBUG_ONLY(_expansion_done = false;)
409 }
410
411 SysClassPath::~SysClassPath() {
412 // Free everything except the base.
413 for (int i = 0; i < _scp_nitems; ++i) {
414 if (i != _scp_base) reset_item_at(i);
415 }
416 DEBUG_ONLY(_expansion_done = false;)
417 }
418
419 inline void SysClassPath::set_base(const char* base) {
420 _items[_scp_base] = base;
421 }
422
423 inline void SysClassPath::add_prefix(const char* prefix) {
424 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
425 }
426
427 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
428 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
429 }
430
431 inline void SysClassPath::add_suffix(const char* suffix) {
432 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
433 }
434
435 inline void SysClassPath::reset_item_at(int index) {
436 assert(index < _scp_nitems && index != _scp_base, "just checking");
437 if (_items[index] != NULL) {
438 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
439 _items[index] = NULL;
440 }
441 }
442
443 inline void SysClassPath::reset_path(const char* base) {
444 // Clear the prefix and suffix.
445 reset_item_at(_scp_prefix);
446 reset_item_at(_scp_suffix);
447 set_base(base);
448 }
449
450 //------------------------------------------------------------------------------
451
452 void SysClassPath::expand_endorsed() {
453 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
454
455 const char* path = Arguments::get_property("java.endorsed.dirs");
456 if (path == NULL) {
457 path = Arguments::get_endorsed_dir();
458 assert(path != NULL, "no default for java.endorsed.dirs");
459 }
460
461 char* expanded_path = NULL;
462 const char separator = *os::path_separator();
463 const char* const end = path + strlen(path);
464 while (path < end) {
465 const char* tmp_end = strchr(path, separator);
466 if (tmp_end == NULL) {
467 expanded_path = add_jars_to_path(expanded_path, path);
468 path = end;
469 } else {
470 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
471 memcpy(dirpath, path, tmp_end - path);
472 dirpath[tmp_end - path] = '\0';
473 expanded_path = add_jars_to_path(expanded_path, dirpath);
474 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
475 path = tmp_end + 1;
476 }
477 }
478 _items[_scp_endorsed] = expanded_path;
479 DEBUG_ONLY(_expansion_done = true;)
480 }
481
482 // Combine the bootclasspath elements, some of which may be null, into a single
483 // c-heap-allocated string.
484 char* SysClassPath::combined_path() {
485 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
486 assert(_expansion_done, "must call expand_endorsed() first.");
487
488 size_t lengths[_scp_nitems];
489 size_t total_len = 0;
490
491 const char separator = *os::path_separator();
492
493 // Get the lengths.
494 int i;
495 for (i = 0; i < _scp_nitems; ++i) {
496 if (_items[i] != NULL) {
497 lengths[i] = strlen(_items[i]);
498 // Include space for the separator char (or a NULL for the last item).
499 total_len += lengths[i] + 1;
500 }
501 }
502 assert(total_len > 0, "empty sysclasspath not allowed");
503
504 // Copy the _items to a single string.
505 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
506 char* cp_tmp = cp;
507 for (i = 0; i < _scp_nitems; ++i) {
508 if (_items[i] != NULL) {
509 memcpy(cp_tmp, _items[i], lengths[i]);
510 cp_tmp += lengths[i];
511 *cp_tmp++ = separator;
512 }
513 }
514 *--cp_tmp = '\0'; // Replace the extra separator.
515 return cp;
516 }
517
518 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
519 char*
520 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
521 char *cp;
522
523 assert(str != NULL, "just checking");
524 if (path == NULL) {
525 size_t len = strlen(str) + 1;
526 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
527 memcpy(cp, str, len); // copy the trailing null
528 } else {
529 const char separator = *os::path_separator();
530 size_t old_len = strlen(path);
531 size_t str_len = strlen(str);
532 size_t len = old_len + str_len + 2;
533
534 if (prepend) {
535 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
536 char* cp_tmp = cp;
537 memcpy(cp_tmp, str, str_len);
538 cp_tmp += str_len;
539 *cp_tmp = separator;
540 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
541 FREE_C_HEAP_ARRAY(char, path, mtInternal);
542 } else {
543 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
544 char* cp_tmp = cp + old_len;
545 *cp_tmp = separator;
546 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
547 }
548 }
549 return cp;
550 }
551
552 // Scan the directory and append any jar or zip files found to path.
553 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
554 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
555 DIR* dir = os::opendir(directory);
556 if (dir == NULL) return path;
557
558 char dir_sep[2] = { '\0', '\0' };
559 size_t directory_len = strlen(directory);
560 const char fileSep = *os::file_separator();
561 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
562
563 /* Scan the directory for jars/zips, appending them to path. */
564 struct dirent *entry;
565 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
566 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
567 const char* name = entry->d_name;
568 const char* ext = name + strlen(name) - 4;
569 bool isJarOrZip = ext > name &&
570 (os::file_name_strcmp(ext, ".jar") == 0 ||
571 os::file_name_strcmp(ext, ".zip") == 0);
572 if (isJarOrZip) {
573 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
574 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
575 path = add_to_path(path, jarpath, false);
576 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
577 }
578 }
579 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
580 os::closedir(dir);
581 return path;
582 }
583
584 // Parses a memory size specification string.
585 static bool atomull(const char *s, julong* result) {
586 julong n = 0;
587 int args_read = 0;
588 bool is_hex = false;
589 // Skip leading 0[xX] for hexadecimal
590 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
591 s += 2;
592 is_hex = true;
593 args_read = sscanf(s, JULONG_FORMAT_X, &n);
594 } else {
595 args_read = sscanf(s, JULONG_FORMAT, &n);
596 }
597 if (args_read != 1) {
598 return false;
599 }
600 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
601 s++;
602 }
603 // 4705540: illegal if more characters are found after the first non-digit
604 if (strlen(s) > 1) {
605 return false;
606 }
607 switch (*s) {
608 case 'T': case 't':
609 *result = n * G * K;
610 // Check for overflow.
611 if (*result/((julong)G * K) != n) return false;
612 return true;
613 case 'G': case 'g':
614 *result = n * G;
615 if (*result/G != n) return false;
616 return true;
617 case 'M': case 'm':
618 *result = n * M;
619 if (*result/M != n) return false;
620 return true;
621 case 'K': case 'k':
622 *result = n * K;
623 if (*result/K != n) return false;
624 return true;
625 case '\0':
626 *result = n;
627 return true;
628 default:
629 return false;
630 }
631 }
632
633 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
634 if (size < min_size) return arg_too_small;
635 // Check that size will fit in a size_t (only relevant on 32-bit)
636 if (size > max_uintx) return arg_too_big;
637 return arg_in_range;
638 }
639
640 // Describe an argument out of range error
641 void Arguments::describe_range_error(ArgsRange errcode) {
642 switch(errcode) {
643 case arg_too_big:
644 jio_fprintf(defaultStream::error_stream(),
645 "The specified size exceeds the maximum "
646 "representable size.\n");
647 break;
648 case arg_too_small:
649 case arg_unreadable:
650 case arg_in_range:
651 // do nothing for now
652 break;
653 default:
654 ShouldNotReachHere();
655 }
656 }
657
658 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
659 return CommandLineFlags::boolAtPut(name, &value, origin);
660 }
661
662 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
663 double v;
664 if (sscanf(value, "%lf", &v) != 1) {
665 return false;
666 }
667
668 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
669 return true;
670 }
671 return false;
672 }
673
674 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
675 julong v;
676 intx intx_v;
677 bool is_neg = false;
678 // Check the sign first since atomull() parses only unsigned values.
679 if (*value == '-') {
680 if (!CommandLineFlags::intxAt(name, &intx_v)) {
681 return false;
682 }
683 value++;
684 is_neg = true;
685 }
686 if (!atomull(value, &v)) {
687 return false;
688 }
689 intx_v = (intx) v;
690 if (is_neg) {
691 intx_v = -intx_v;
692 }
693 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
694 return true;
695 }
696 uintx uintx_v = (uintx) v;
697 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
698 return true;
699 }
700 uint64_t uint64_t_v = (uint64_t) v;
701 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
702 return true;
703 }
704 return false;
705 }
706
707 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
708 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
709 // Contract: CommandLineFlags always returns a pointer that needs freeing.
710 FREE_C_HEAP_ARRAY(char, value, mtInternal);
711 return true;
712 }
713
714 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
715 const char* old_value = "";
716 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
717 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
718 size_t new_len = strlen(new_value);
719 const char* value;
720 char* free_this_too = NULL;
721 if (old_len == 0) {
722 value = new_value;
723 } else if (new_len == 0) {
724 value = old_value;
725 } else {
726 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
727 // each new setting adds another LINE to the switch:
728 sprintf(buf, "%s\n%s", old_value, new_value);
729 value = buf;
730 free_this_too = buf;
731 }
732 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
733 // CommandLineFlags always returns a pointer that needs freeing.
734 FREE_C_HEAP_ARRAY(char, value, mtInternal);
735 if (free_this_too != NULL) {
736 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
737 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
738 }
739 return true;
740 }
741
742 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
743
744 // range of acceptable characters spelled out for portability reasons
745 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
746 #define BUFLEN 255
747 char name[BUFLEN+1];
748 char dummy;
749
750 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
751 return set_bool_flag(name, false, origin);
752 }
753 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
754 return set_bool_flag(name, true, origin);
755 }
756
757 char punct;
758 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
759 const char* value = strchr(arg, '=') + 1;
760 Flag* flag = Flag::find_flag(name, strlen(name));
761 if (flag != NULL && flag->is_ccstr()) {
762 if (flag->ccstr_accumulates()) {
763 return append_to_string_flag(name, value, origin);
764 } else {
765 if (value[0] == '\0') {
766 value = NULL;
767 }
768 return set_string_flag(name, value, origin);
769 }
770 }
771 }
772
773 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
774 const char* value = strchr(arg, '=') + 1;
775 // -XX:Foo:=xxx will reset the string flag to the given value.
776 if (value[0] == '\0') {
777 value = NULL;
778 }
779 return set_string_flag(name, value, origin);
780 }
781
782 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
783 #define SIGNED_NUMBER_RANGE "[-0123456789]"
784 #define NUMBER_RANGE "[0123456789]"
785 char value[BUFLEN + 1];
786 char value2[BUFLEN + 1];
787 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
788 // Looks like a floating-point number -- try again with more lenient format string
789 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
790 return set_fp_numeric_flag(name, value, origin);
791 }
792 }
793
794 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
795 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
796 return set_numeric_flag(name, value, origin);
797 }
798
799 return false;
800 }
801
802 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
803 assert(bldarray != NULL, "illegal argument");
804
805 if (arg == NULL) {
806 return;
807 }
808
809 int new_count = *count + 1;
810
811 // expand the array and add arg to the last element
812 if (*bldarray == NULL) {
813 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
814 } else {
815 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
816 }
817 (*bldarray)[*count] = strdup(arg);
818 *count = new_count;
819 }
820
821 void Arguments::build_jvm_args(const char* arg) {
822 add_string(&_jvm_args_array, &_num_jvm_args, arg);
823 }
824
825 void Arguments::build_jvm_flags(const char* arg) {
826 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
827 }
828
829 // utility function to return a string that concatenates all
830 // strings in a given char** array
831 const char* Arguments::build_resource_string(char** args, int count) {
832 if (args == NULL || count == 0) {
833 return NULL;
834 }
835 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
836 for (int i = 1; i < count; i++) {
837 length += strlen(args[i]) + 1; // add 1 for a space
838 }
839 char* s = NEW_RESOURCE_ARRAY(char, length);
840 strcpy(s, args[0]);
841 for (int j = 1; j < count; j++) {
842 strcat(s, " ");
843 strcat(s, args[j]);
844 }
845 return (const char*) s;
846 }
847
848 void Arguments::print_on(outputStream* st) {
849 st->print_cr("VM Arguments:");
850 if (num_jvm_flags() > 0) {
851 st->print("jvm_flags: "); print_jvm_flags_on(st);
852 }
853 if (num_jvm_args() > 0) {
854 st->print("jvm_args: "); print_jvm_args_on(st);
855 }
856 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
857 if (_java_class_path != NULL) {
858 char* path = _java_class_path->value();
859 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
860 }
861 st->print_cr("Launcher Type: %s", _sun_java_launcher);
862 }
863
864 void Arguments::print_jvm_flags_on(outputStream* st) {
865 if (_num_jvm_flags > 0) {
866 for (int i=0; i < _num_jvm_flags; i++) {
867 st->print("%s ", _jvm_flags_array[i]);
868 }
869 st->cr();
870 }
871 }
872
873 void Arguments::print_jvm_args_on(outputStream* st) {
874 if (_num_jvm_args > 0) {
875 for (int i=0; i < _num_jvm_args; i++) {
876 st->print("%s ", _jvm_args_array[i]);
877 }
878 st->cr();
879 }
880 }
881
882 bool Arguments::process_argument(const char* arg,
883 jboolean ignore_unrecognized, Flag::Flags origin) {
884
885 JDK_Version since = JDK_Version();
886
887 if (parse_argument(arg, origin) || ignore_unrecognized) {
888 return true;
889 }
890
891 bool has_plus_minus = (*arg == '+' || *arg == '-');
892 const char* const argname = has_plus_minus ? arg + 1 : arg;
893 if (is_newly_obsolete(arg, &since)) {
894 char version[256];
895 since.to_string(version, sizeof(version));
896 warning("ignoring option %s; support was removed in %s", argname, version);
897 return true;
898 }
899
900 // For locked flags, report a custom error message if available.
901 // Otherwise, report the standard unrecognized VM option.
902
903 size_t arg_len;
904 const char* equal_sign = strchr(argname, '=');
905 if (equal_sign == NULL) {
906 arg_len = strlen(argname);
907 } else {
908 arg_len = equal_sign - argname;
909 }
910
911 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
912 if (found_flag != NULL) {
913 char locked_message_buf[BUFLEN];
914 found_flag->get_locked_message(locked_message_buf, BUFLEN);
915 if (strlen(locked_message_buf) == 0) {
916 if (found_flag->is_bool() && !has_plus_minus) {
917 jio_fprintf(defaultStream::error_stream(),
918 "Missing +/- setting for VM option '%s'\n", argname);
919 } else if (!found_flag->is_bool() && has_plus_minus) {
920 jio_fprintf(defaultStream::error_stream(),
921 "Unexpected +/- setting in VM option '%s'\n", argname);
922 } else {
923 jio_fprintf(defaultStream::error_stream(),
924 "Improperly specified VM option '%s'\n", argname);
925 }
926 } else {
927 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
928 }
929 } else {
930 jio_fprintf(defaultStream::error_stream(),
931 "Unrecognized VM option '%s'\n", argname);
932 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
933 if (fuzzy_matched != NULL) {
934 jio_fprintf(defaultStream::error_stream(),
935 "Did you mean '%s%s%s'?\n",
936 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
937 fuzzy_matched->_name,
938 (fuzzy_matched->is_bool()) ? "" : "=<value>");
939 }
940 }
941
942 // allow for commandline "commenting out" options like -XX:#+Verbose
943 return arg[0] == '#';
944 }
945
946 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
947 FILE* stream = fopen(file_name, "rb");
948 if (stream == NULL) {
949 if (should_exist) {
950 jio_fprintf(defaultStream::error_stream(),
951 "Could not open settings file %s\n", file_name);
952 return false;
953 } else {
954 return true;
955 }
956 }
957
958 char token[1024];
959 int pos = 0;
960
961 bool in_white_space = true;
962 bool in_comment = false;
963 bool in_quote = false;
964 char quote_c = 0;
965 bool result = true;
966
967 int c = getc(stream);
968 while(c != EOF && pos < (int)(sizeof(token)-1)) {
969 if (in_white_space) {
970 if (in_comment) {
971 if (c == '\n') in_comment = false;
972 } else {
973 if (c == '#') in_comment = true;
974 else if (!isspace(c)) {
975 in_white_space = false;
976 token[pos++] = c;
977 }
978 }
979 } else {
980 if (c == '\n' || (!in_quote && isspace(c))) {
981 // token ends at newline, or at unquoted whitespace
982 // this allows a way to include spaces in string-valued options
983 token[pos] = '\0';
984 logOption(token);
985 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
986 build_jvm_flags(token);
987 pos = 0;
988 in_white_space = true;
989 in_quote = false;
990 } else if (!in_quote && (c == '\'' || c == '"')) {
991 in_quote = true;
992 quote_c = c;
993 } else if (in_quote && (c == quote_c)) {
994 in_quote = false;
995 } else {
996 token[pos++] = c;
997 }
998 }
999 c = getc(stream);
1000 }
1001 if (pos > 0) {
1002 token[pos] = '\0';
1003 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1004 build_jvm_flags(token);
1005 }
1006 fclose(stream);
1007 return result;
1008 }
1009
1010 //=============================================================================================================
1011 // Parsing of properties (-D)
1012
1013 const char* Arguments::get_property(const char* key) {
1014 return PropertyList_get_value(system_properties(), key);
1015 }
1016
1017 bool Arguments::add_property(const char* prop) {
1018 const char* eq = strchr(prop, '=');
1019 char* key;
1020 // ns must be static--its address may be stored in a SystemProperty object.
1021 const static char ns[1] = {0};
1022 char* value = (char *)ns;
1023
1024 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1025 key = AllocateHeap(key_len + 1, mtInternal);
1026 strncpy(key, prop, key_len);
1027 key[key_len] = '\0';
1028
1029 if (eq != NULL) {
1030 size_t value_len = strlen(prop) - key_len - 1;
1031 value = AllocateHeap(value_len + 1, mtInternal);
1032 strncpy(value, &prop[key_len + 1], value_len + 1);
1033 }
1034
1035 if (strcmp(key, "java.compiler") == 0) {
1036 process_java_compiler_argument(value);
1037 FreeHeap(key);
1038 if (eq != NULL) {
1039 FreeHeap(value);
1040 }
1041 return true;
1042 } else if (strcmp(key, "sun.java.command") == 0) {
1043 _java_command = value;
1044
1045 // Record value in Arguments, but let it get passed to Java.
1046 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1047 strcmp(key, "sun.java.launcher.pid") == 0) {
1048 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1049 // private and are processed in process_sun_java_launcher_properties();
1050 // the sun.java.launcher property is passed on to the java application
1051 FreeHeap(key);
1052 if (eq != NULL) {
1053 FreeHeap(value);
1054 }
1055 return true;
1056 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1057 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1058 // its value without going through the property list or making a Java call.
1059 _java_vendor_url_bug = value;
1060 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1061 PropertyList_unique_add(&_system_properties, key, value, true);
1062 return true;
1063 }
1064 // Create new property and add at the end of the list
1065 PropertyList_unique_add(&_system_properties, key, value);
1066 return true;
1067 }
1068
1069 //===========================================================================================================
1070 // Setting int/mixed/comp mode flags
1071
1072 void Arguments::set_mode_flags(Mode mode) {
1073 // Set up default values for all flags.
1074 // If you add a flag to any of the branches below,
1075 // add a default value for it here.
1076 set_java_compiler(false);
1077 _mode = mode;
1078
1079 // Ensure Agent_OnLoad has the correct initial values.
1080 // This may not be the final mode; mode may change later in onload phase.
1081 PropertyList_unique_add(&_system_properties, "java.vm.info",
1082 (char*)VM_Version::vm_info_string(), false);
1083
1084 UseInterpreter = true;
1085 UseCompiler = true;
1086 UseLoopCounter = true;
1087
1088 #ifndef ZERO
1089 // Turn these off for mixed and comp. Leave them on for Zero.
1090 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1091 UseFastAccessorMethods = (mode == _int);
1092 }
1093 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1094 UseFastEmptyMethods = (mode == _int);
1095 }
1096 #endif
1097
1098 // Default values may be platform/compiler dependent -
1099 // use the saved values
1100 ClipInlining = Arguments::_ClipInlining;
1101 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1102 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1103 BackgroundCompilation = Arguments::_BackgroundCompilation;
1104
1105 // Change from defaults based on mode
1106 switch (mode) {
1107 default:
1108 ShouldNotReachHere();
1109 break;
1110 case _int:
1111 UseCompiler = false;
1112 UseLoopCounter = false;
1113 AlwaysCompileLoopMethods = false;
1114 UseOnStackReplacement = false;
1115 break;
1116 case _mixed:
1117 // same as default
1118 break;
1119 case _comp:
1120 UseInterpreter = false;
1121 BackgroundCompilation = false;
1122 ClipInlining = false;
1123 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1124 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1125 // compile a level 4 (C2) and then continue executing it.
1126 if (TieredCompilation) {
1127 Tier3InvokeNotifyFreqLog = 0;
1128 Tier4InvocationThreshold = 0;
1129 }
1130 break;
1131 }
1132 }
1133
1134 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1135 // Conflict: required to use shared spaces (-Xshare:on), but
1136 // incompatible command line options were chosen.
1137
1138 static void no_shared_spaces() {
1139 if (RequireSharedSpaces) {
1140 jio_fprintf(defaultStream::error_stream(),
1141 "Class data sharing is inconsistent with other specified options.\n");
1142 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1143 } else {
1144 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1145 }
1146 }
1147 #endif
1148
1149 void Arguments::set_tiered_flags() {
1150 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1151 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1152 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1153 }
1154 if (CompilationPolicyChoice < 2) {
1155 vm_exit_during_initialization(
1156 "Incompatible compilation policy selected", NULL);
1157 }
1158 // Increase the code cache size - tiered compiles a lot more.
1159 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1160 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1161 }
1162 if (!UseInterpreter) { // -Xcomp
1163 Tier3InvokeNotifyFreqLog = 0;
1164 Tier4InvocationThreshold = 0;
1165 }
1166 }
1167
1168 /**
1169 * Returns the minimum number of compiler threads needed to run the JVM. The following
1170 * configurations are possible.
1171 *
1172 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1173 * compiler threads is 0.
1174 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1175 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1176 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1177 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1178 * C1 can be used, so the minimum number of compiler threads is 1.
1179 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1180 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1181 * the minimum number of compiler threads is 2.
1182 */
1183 int Arguments::get_min_number_of_compiler_threads() {
1184 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1185 return 0; // case 1
1186 #else
1187 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1188 return 1; // case 2 or case 3
1189 }
1190 return 2; // case 4 (tiered)
1191 #endif
1192 }
1193
1194 #if INCLUDE_ALL_GCS
1195 static void disable_adaptive_size_policy(const char* collector_name) {
1196 if (UseAdaptiveSizePolicy) {
1197 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1198 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1199 collector_name);
1200 }
1201 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1202 }
1203 }
1204
1205 void Arguments::set_parnew_gc_flags() {
1206 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1207 "control point invariant");
1208 assert(UseParNewGC, "Error");
1209
1210 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1211 disable_adaptive_size_policy("UseParNewGC");
1212
1213 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1214 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1215 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1216 } else if (ParallelGCThreads == 0) {
1217 jio_fprintf(defaultStream::error_stream(),
1218 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1219 vm_exit(1);
1220 }
1221
1222 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1223 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1224 // we set them to 1024 and 1024.
1225 // See CR 6362902.
1226 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1227 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1228 }
1229 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1230 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1231 }
1232
1233 // When using compressed oops, we use local overflow stacks,
1234 // rather than using a global overflow list chained through
1235 // the klass word of the object's pre-image.
1236 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1237 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1238 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1239 }
1240 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1241 }
1242 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1243 }
1244
1245 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1246 // sparc/solaris for certain applications, but would gain from
1247 // further optimization and tuning efforts, and would almost
1248 // certainly gain from analysis of platform and environment.
1249 void Arguments::set_cms_and_parnew_gc_flags() {
1250 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1251 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1252
1253 // If we are using CMS, we prefer to UseParNewGC,
1254 // unless explicitly forbidden.
1255 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1256 FLAG_SET_ERGO(bool, UseParNewGC, true);
1257 }
1258
1259 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1260 disable_adaptive_size_policy("UseConcMarkSweepGC");
1261
1262 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1263 // as needed.
1264 if (UseParNewGC) {
1265 set_parnew_gc_flags();
1266 }
1267
1268 size_t max_heap = align_size_down(MaxHeapSize,
1269 CardTableRS::ct_max_alignment_constraint());
1270
1271 // Now make adjustments for CMS
1272 intx tenuring_default = (intx)6;
1273 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1274
1275 // Preferred young gen size for "short" pauses:
1276 // upper bound depends on # of threads and NewRatio.
1277 const uintx parallel_gc_threads =
1278 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1279 const size_t preferred_max_new_size_unaligned =
1280 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1281 size_t preferred_max_new_size =
1282 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1283
1284 // Unless explicitly requested otherwise, size young gen
1285 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1286
1287 // If either MaxNewSize or NewRatio is set on the command line,
1288 // assume the user is trying to set the size of the young gen.
1289 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1290
1291 // Set MaxNewSize to our calculated preferred_max_new_size unless
1292 // NewSize was set on the command line and it is larger than
1293 // preferred_max_new_size.
1294 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1295 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, (uintx)preferred_max_new_size));
1296 } else {
1297 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1298 }
1299 if (PrintGCDetails && Verbose) {
1300 // Too early to use gclog_or_tty
1301 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1302 }
1303
1304 // Code along this path potentially sets NewSize and OldSize
1305 if (PrintGCDetails && Verbose) {
1306 // Too early to use gclog_or_tty
1307 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1308 " initial_heap_size: " SIZE_FORMAT
1309 " max_heap: " SIZE_FORMAT,
1310 min_heap_size(), InitialHeapSize, max_heap);
1311 }
1312 size_t min_new = preferred_max_new_size;
1313 if (FLAG_IS_CMDLINE(NewSize)) {
1314 min_new = NewSize;
1315 }
1316 if (max_heap > min_new && min_heap_size() > min_new) {
1317 // Unless explicitly requested otherwise, make young gen
1318 // at least min_new, and at most preferred_max_new_size.
1319 if (FLAG_IS_DEFAULT(NewSize)) {
1320 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, (uintx)min_new));
1321 FLAG_SET_ERGO(uintx, NewSize, MIN2((uintx)preferred_max_new_size, NewSize));
1322 if (PrintGCDetails && Verbose) {
1323 // Too early to use gclog_or_tty
1324 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1325 }
1326 }
1327 // Unless explicitly requested otherwise, size old gen
1328 // so it's NewRatio x of NewSize.
1329 if (FLAG_IS_DEFAULT(OldSize)) {
1330 if (max_heap > NewSize) {
1331 FLAG_SET_ERGO(uintx, OldSize, MIN2((NewRatio*NewSize), (uintx)(max_heap - NewSize)));
1332 if (PrintGCDetails && Verbose) {
1333 // Too early to use gclog_or_tty
1334 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1335 }
1336 }
1337 }
1338 }
1339 }
1340 // Unless explicitly requested otherwise, definitely
1341 // promote all objects surviving "tenuring_default" scavenges.
1342 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1343 FLAG_IS_DEFAULT(SurvivorRatio)) {
1344 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1345 }
1346 // If we decided above (or user explicitly requested)
1347 // `promote all' (via MaxTenuringThreshold := 0),
1348 // prefer minuscule survivor spaces so as not to waste
1349 // space for (non-existent) survivors
1350 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1351 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1352 }
1353 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1354 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1355 // This is done in order to make ParNew+CMS configuration to work
1356 // with YoungPLABSize and OldPLABSize options.
1357 // See CR 6362902.
1358 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1359 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1360 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1361 // is. In this situation let CMSParPromoteBlocksToClaim follow
1362 // the value (either from the command line or ergonomics) of
1363 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1364 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1365 } else {
1366 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1367 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1368 // we'll let it to take precedence.
1369 jio_fprintf(defaultStream::error_stream(),
1370 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1371 " options are specified for the CMS collector."
1372 " CMSParPromoteBlocksToClaim will take precedence.\n");
1373 }
1374 }
1375 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1376 // OldPLAB sizing manually turned off: Use a larger default setting,
1377 // unless it was manually specified. This is because a too-low value
1378 // will slow down scavenges.
1379 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1380 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1381 }
1382 }
1383 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1384 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1385 // If either of the static initialization defaults have changed, note this
1386 // modification.
1387 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1388 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1389 }
1390 if (PrintGCDetails && Verbose) {
1391 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1392 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1393 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1394 }
1395 }
1396 #endif // INCLUDE_ALL_GCS
1397
1398 void set_object_alignment() {
1399 // Object alignment.
1400 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1401 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1402 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1403 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1404 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1405 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1406
1407 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1408 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1409
1410 // Oop encoding heap max
1411 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1412
1413 #if INCLUDE_ALL_GCS
1414 // Set CMS global values
1415 CompactibleFreeListSpace::set_cms_values();
1416 #endif // INCLUDE_ALL_GCS
1417 }
1418
1419 bool verify_object_alignment() {
1420 // Object alignment.
1421 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1422 jio_fprintf(defaultStream::error_stream(),
1423 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1424 (int)ObjectAlignmentInBytes);
1425 return false;
1426 }
1427 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1428 jio_fprintf(defaultStream::error_stream(),
1429 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1430 (int)ObjectAlignmentInBytes, BytesPerLong);
1431 return false;
1432 }
1433 // It does not make sense to have big object alignment
1434 // since a space lost due to alignment will be greater
1435 // then a saved space from compressed oops.
1436 if ((int)ObjectAlignmentInBytes > 256) {
1437 jio_fprintf(defaultStream::error_stream(),
1438 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1439 (int)ObjectAlignmentInBytes);
1440 return false;
1441 }
1442 // In case page size is very small.
1443 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1444 jio_fprintf(defaultStream::error_stream(),
1445 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1446 (int)ObjectAlignmentInBytes, os::vm_page_size());
1447 return false;
1448 }
1449 return true;
1450 }
1451
1452 size_t Arguments::max_heap_for_compressed_oops() {
1453 // Avoid sign flip.
1454 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1455 // We need to fit both the NULL page and the heap into the memory budget, while
1456 // keeping alignment constraints of the heap. To guarantee the latter, as the
1457 // NULL page is located before the heap, we pad the NULL page to the conservative
1458 // maximum alignment that the GC may ever impose upon the heap.
1459 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1460 _conservative_max_heap_alignment);
1461
1462 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1463 NOT_LP64(ShouldNotReachHere(); return 0);
1464 }
1465
1466 bool Arguments::should_auto_select_low_pause_collector() {
1467 if (UseAutoGCSelectPolicy &&
1468 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1469 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1470 if (PrintGCDetails) {
1471 // Cannot use gclog_or_tty yet.
1472 tty->print_cr("Automatic selection of the low pause collector"
1473 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1474 }
1475 return true;
1476 }
1477 return false;
1478 }
1479
1480 void Arguments::set_use_compressed_oops() {
1481 #ifndef ZERO
1482 #ifdef _LP64
1483 // MaxHeapSize is not set up properly at this point, but
1484 // the only value that can override MaxHeapSize if we are
1485 // to use UseCompressedOops is InitialHeapSize.
1486 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1487
1488 if (max_heap_size <= max_heap_for_compressed_oops()) {
1489 #if !defined(COMPILER1) || defined(TIERED)
1490 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1491 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1492 }
1493 #endif
1494 #ifdef _WIN64
1495 if (UseLargePages && UseCompressedOops) {
1496 // Cannot allocate guard pages for implicit checks in indexed addressing
1497 // mode, when large pages are specified on windows.
1498 // This flag could be switched ON if narrow oop base address is set to 0,
1499 // see code in Universe::initialize_heap().
1500 Universe::set_narrow_oop_use_implicit_null_checks(false);
1501 }
1502 #endif // _WIN64
1503 } else {
1504 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1505 warning("Max heap size too large for Compressed Oops");
1506 FLAG_SET_DEFAULT(UseCompressedOops, false);
1507 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1508 }
1509 }
1510 #endif // _LP64
1511 #endif // ZERO
1512 }
1513
1514
1515 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1516 // set_use_compressed_oops().
1517 void Arguments::set_use_compressed_klass_ptrs() {
1518 #ifndef ZERO
1519 #ifdef _LP64
1520 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1521 if (!UseCompressedOops) {
1522 if (UseCompressedClassPointers) {
1523 warning("UseCompressedClassPointers requires UseCompressedOops");
1524 }
1525 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1526 } else {
1527 // Turn on UseCompressedClassPointers too
1528 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1529 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1530 }
1531 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1532 if (UseCompressedClassPointers) {
1533 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1534 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1535 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1536 }
1537 }
1538 }
1539 #endif // _LP64
1540 #endif // !ZERO
1541 }
1542
1543 void Arguments::set_conservative_max_heap_alignment() {
1544 // The conservative maximum required alignment for the heap is the maximum of
1545 // the alignments imposed by several sources: any requirements from the heap
1546 // itself, the collector policy and the maximum page size we may run the VM
1547 // with.
1548 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1549 #if INCLUDE_ALL_GCS
1550 if (UseParallelGC) {
1551 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1552 } else if (UseG1GC) {
1553 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1554 }
1555 #endif // INCLUDE_ALL_GCS
1556 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1557 CollectorPolicy::compute_heap_alignment());
1558 }
1559
1560 void Arguments::set_ergonomics_flags() {
1561
1562 if (os::is_server_class_machine()) {
1563 // If no other collector is requested explicitly,
1564 // let the VM select the collector based on
1565 // machine class and automatic selection policy.
1566 if (!UseSerialGC &&
1567 !UseConcMarkSweepGC &&
1568 !UseG1GC &&
1569 !UseParNewGC &&
1570 FLAG_IS_DEFAULT(UseParallelGC)) {
1571 if (should_auto_select_low_pause_collector()) {
1572 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1573 } else {
1574 FLAG_SET_ERGO(bool, UseParallelGC, true);
1575 }
1576 }
1577 }
1578 #ifdef COMPILER2
1579 // Shared spaces work fine with other GCs but causes bytecode rewriting
1580 // to be disabled, which hurts interpreter performance and decreases
1581 // server performance. When -server is specified, keep the default off
1582 // unless it is asked for. Future work: either add bytecode rewriting
1583 // at link time, or rewrite bytecodes in non-shared methods.
1584 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1585 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1586 no_shared_spaces();
1587 }
1588 #endif
1589
1590 set_conservative_max_heap_alignment();
1591
1592 #ifndef ZERO
1593 #ifdef _LP64
1594 set_use_compressed_oops();
1595
1596 // set_use_compressed_klass_ptrs() must be called after calling
1597 // set_use_compressed_oops().
1598 set_use_compressed_klass_ptrs();
1599
1600 // Also checks that certain machines are slower with compressed oops
1601 // in vm_version initialization code.
1602 #endif // _LP64
1603 #endif // !ZERO
1604 }
1605
1606 void Arguments::set_parallel_gc_flags() {
1607 assert(UseParallelGC || UseParallelOldGC, "Error");
1608 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1609 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1610 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1611 }
1612 FLAG_SET_DEFAULT(UseParallelGC, true);
1613
1614 // If no heap maximum was requested explicitly, use some reasonable fraction
1615 // of the physical memory, up to a maximum of 1GB.
1616 FLAG_SET_DEFAULT(ParallelGCThreads,
1617 Abstract_VM_Version::parallel_worker_threads());
1618 if (ParallelGCThreads == 0) {
1619 jio_fprintf(defaultStream::error_stream(),
1620 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1621 vm_exit(1);
1622 }
1623
1624 if (UseAdaptiveSizePolicy) {
1625 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1626 // unless the user actually sets these flags.
1627 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1628 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1629 }
1630 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1631 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1632 }
1633 }
1634
1635 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1636 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1637 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1638 // See CR 6362902 for details.
1639 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1640 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1641 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1642 }
1643 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1644 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1645 }
1646 }
1647
1648 if (UseParallelOldGC) {
1649 // Par compact uses lower default values since they are treated as
1650 // minimums. These are different defaults because of the different
1651 // interpretation and are not ergonomically set.
1652 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1653 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1654 }
1655 }
1656 }
1657
1658 void Arguments::set_g1_gc_flags() {
1659 assert(UseG1GC, "Error");
1660 #ifdef COMPILER1
1661 FastTLABRefill = false;
1662 #endif
1663 FLAG_SET_DEFAULT(ParallelGCThreads,
1664 Abstract_VM_Version::parallel_worker_threads());
1665 if (ParallelGCThreads == 0) {
1666 FLAG_SET_DEFAULT(ParallelGCThreads,
1667 Abstract_VM_Version::parallel_worker_threads());
1668 }
1669
1670 // MarkStackSize will be set (if it hasn't been set by the user)
1671 // when concurrent marking is initialized.
1672 // Its value will be based upon the number of parallel marking threads.
1673 // But we do set the maximum mark stack size here.
1674 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1675 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1676 }
1677
1678 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1679 // In G1, we want the default GC overhead goal to be higher than
1680 // say in PS. So we set it here to 10%. Otherwise the heap might
1681 // be expanded more aggressively than we would like it to. In
1682 // fact, even 10% seems to not be high enough in some cases
1683 // (especially small GC stress tests that the main thing they do
1684 // is allocation). We might consider increase it further.
1685 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1686 }
1687
1688 if (PrintGCDetails && Verbose) {
1689 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1690 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1691 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1692 }
1693 }
1694
1695 julong Arguments::limit_by_allocatable_memory(julong limit) {
1696 julong max_allocatable;
1697 julong result = limit;
1698 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1699 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1700 }
1701 return result;
1702 }
1703
1704 // Use static initialization to get the default before parsing
1705 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1706
1707 void Arguments::set_heap_size() {
1708 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1709 // Deprecated flag
1710 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1711 }
1712
1713 const julong phys_mem =
1714 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1715 : (julong)MaxRAM;
1716
1717 // If the maximum heap size has not been set with -Xmx,
1718 // then set it as fraction of the size of physical memory,
1719 // respecting the maximum and minimum sizes of the heap.
1720 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1721 julong reasonable_max = phys_mem / MaxRAMFraction;
1722
1723 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1724 // Small physical memory, so use a minimum fraction of it for the heap
1725 reasonable_max = phys_mem / MinRAMFraction;
1726 } else {
1727 // Not-small physical memory, so require a heap at least
1728 // as large as MaxHeapSize
1729 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1730 }
1731 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1732 // Limit the heap size to ErgoHeapSizeLimit
1733 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1734 }
1735 if (UseCompressedOops) {
1736 // Limit the heap size to the maximum possible when using compressed oops
1737 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1738
1739 // HeapBaseMinAddress can be greater than default but not less than.
1740 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1741 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1742 // matches compressed oops printing flags
1743 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1744 jio_fprintf(defaultStream::error_stream(),
1745 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1746 " (" UINTX_FORMAT "G) which is greater than value given "
1747 UINTX_FORMAT "\n",
1748 DefaultHeapBaseMinAddress,
1749 DefaultHeapBaseMinAddress/G,
1750 HeapBaseMinAddress);
1751 }
1752 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1753 }
1754 }
1755
1756 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1757 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1758 // but it should be not less than default MaxHeapSize.
1759 max_coop_heap -= HeapBaseMinAddress;
1760 }
1761 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1762 }
1763 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1764
1765 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1766 // An initial heap size was specified on the command line,
1767 // so be sure that the maximum size is consistent. Done
1768 // after call to limit_by_allocatable_memory because that
1769 // method might reduce the allocation size.
1770 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1771 }
1772
1773 if (PrintGCDetails && Verbose) {
1774 // Cannot use gclog_or_tty yet.
1775 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1776 }
1777 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1778 }
1779
1780 // If the minimum or initial heap_size have not been set or requested to be set
1781 // ergonomically, set them accordingly.
1782 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1783 julong reasonable_minimum = (julong)(OldSize + NewSize);
1784
1785 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1786
1787 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1788
1789 if (InitialHeapSize == 0) {
1790 julong reasonable_initial = phys_mem / InitialRAMFraction;
1791
1792 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1793 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1794
1795 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1796
1797 if (PrintGCDetails && Verbose) {
1798 // Cannot use gclog_or_tty yet.
1799 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1800 }
1801 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1802 }
1803 // If the minimum heap size has not been set (via -Xms),
1804 // synchronize with InitialHeapSize to avoid errors with the default value.
1805 if (min_heap_size() == 0) {
1806 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1807 if (PrintGCDetails && Verbose) {
1808 // Cannot use gclog_or_tty yet.
1809 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1810 }
1811 }
1812 }
1813 }
1814
1815 // This must be called after ergonomics because we want bytecode rewriting
1816 // if the server compiler is used, or if UseSharedSpaces is disabled.
1817 void Arguments::set_bytecode_flags() {
1818 // Better not attempt to store into a read-only space.
1819 if (UseSharedSpaces) {
1820 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1821 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1822 }
1823
1824 if (!RewriteBytecodes) {
1825 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1826 }
1827 }
1828
1829 // Aggressive optimization flags -XX:+AggressiveOpts
1830 void Arguments::set_aggressive_opts_flags() {
1831 #ifdef COMPILER2
1832 if (AggressiveUnboxing) {
1833 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1834 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1835 } else if (!EliminateAutoBox) {
1836 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1837 AggressiveUnboxing = false;
1838 }
1839 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1840 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1841 } else if (!DoEscapeAnalysis) {
1842 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1843 AggressiveUnboxing = false;
1844 }
1845 }
1846 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1847 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1848 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1849 }
1850 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1851 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1852 }
1853
1854 // Feed the cache size setting into the JDK
1855 char buffer[1024];
1856 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1857 add_property(buffer);
1858 }
1859 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1860 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1861 }
1862 #endif
1863
1864 if (AggressiveOpts) {
1865 // Sample flag setting code
1866 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1867 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1868 // }
1869 }
1870 }
1871
1872 //===========================================================================================================
1873 // Parsing of java.compiler property
1874
1875 void Arguments::process_java_compiler_argument(char* arg) {
1876 // For backwards compatibility, Djava.compiler=NONE or ""
1877 // causes us to switch to -Xint mode UNLESS -Xdebug
1878 // is also specified.
1879 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1880 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1881 }
1882 }
1883
1884 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1885 _sun_java_launcher = strdup(launcher);
1886 }
1887
1888 bool Arguments::created_by_java_launcher() {
1889 assert(_sun_java_launcher != NULL, "property must have value");
1890 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1891 }
1892
1893 bool Arguments::sun_java_launcher_is_altjvm() {
1894 return _sun_java_launcher_is_altjvm;
1895 }
1896
1897 //===========================================================================================================
1898 // Parsing of main arguments
1899
1900 bool Arguments::verify_interval(uintx val, uintx min,
1901 uintx max, const char* name) {
1902 // Returns true iff value is in the inclusive interval [min..max]
1903 // false, otherwise.
1904 if (val >= min && val <= max) {
1905 return true;
1906 }
1907 jio_fprintf(defaultStream::error_stream(),
1908 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1909 " and " UINTX_FORMAT "\n",
1910 name, val, min, max);
1911 return false;
1912 }
1913
1914 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1915 // Returns true if given value is at least specified min threshold
1916 // false, otherwise.
1917 if (val >= min ) {
1918 return true;
1919 }
1920 jio_fprintf(defaultStream::error_stream(),
1921 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1922 name, val, min);
1923 return false;
1924 }
1925
1926 bool Arguments::verify_percentage(uintx value, const char* name) {
1927 if (is_percentage(value)) {
1928 return true;
1929 }
1930 jio_fprintf(defaultStream::error_stream(),
1931 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1932 name, value);
1933 return false;
1934 }
1935
1936 #if !INCLUDE_ALL_GCS
1937 #ifdef ASSERT
1938 static bool verify_serial_gc_flags() {
1939 return (UseSerialGC &&
1940 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1941 UseParallelGC || UseParallelOldGC));
1942 }
1943 #endif // ASSERT
1944 #endif // INCLUDE_ALL_GCS
1945
1946 // check if do gclog rotation
1947 // +UseGCLogFileRotation is a must,
1948 // no gc log rotation when log file not supplied or
1949 // NumberOfGCLogFiles is 0
1950 void check_gclog_consistency() {
1951 if (UseGCLogFileRotation) {
1952 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1953 jio_fprintf(defaultStream::output_stream(),
1954 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1955 "where num_of_file > 0\n"
1956 "GC log rotation is turned off\n");
1957 UseGCLogFileRotation = false;
1958 }
1959 }
1960
1961 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1962 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1963 jio_fprintf(defaultStream::output_stream(),
1964 "GCLogFileSize changed to minimum 8K\n");
1965 }
1966 }
1967
1968 // This function is called for -Xloggc:<filename>, it can be used
1969 // to check if a given file name(or string) conforms to the following
1970 // specification:
1971 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1972 // %p and %t only allowed once. We only limit usage of filename not path
1973 bool is_filename_valid(const char *file_name) {
1974 const char* p = file_name;
1975 char file_sep = os::file_separator()[0];
1976 const char* cp;
1977 // skip prefix path
1978 for (cp = file_name; *cp != '\0'; cp++) {
1979 if (*cp == '/' || *cp == file_sep) {
1980 p = cp + 1;
1981 }
1982 }
1983
1984 int count_p = 0;
1985 int count_t = 0;
1986 while (*p != '\0') {
1987 if ((*p >= '0' && *p <= '9') ||
1988 (*p >= 'A' && *p <= 'Z') ||
1989 (*p >= 'a' && *p <= 'z') ||
1990 *p == '-' ||
1991 *p == '_' ||
1992 *p == '.') {
1993 p++;
1994 continue;
1995 }
1996 if (*p == '%') {
1997 if(*(p + 1) == 'p') {
1998 p += 2;
1999 count_p ++;
2000 continue;
2001 }
2002 if (*(p + 1) == 't') {
2003 p += 2;
2004 count_t ++;
2005 continue;
2006 }
2007 }
2008 return false;
2009 }
2010 return count_p < 2 && count_t < 2;
2011 }
2012
2013 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2014 if (!is_percentage(min_heap_free_ratio)) {
2015 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2016 return false;
2017 }
2018 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2019 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2020 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2021 MaxHeapFreeRatio);
2022 return false;
2023 }
2024 return true;
2025 }
2026
2027 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2028 if (!is_percentage(max_heap_free_ratio)) {
2029 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2030 return false;
2031 }
2032 if (max_heap_free_ratio < MinHeapFreeRatio) {
2033 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2034 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2035 MinHeapFreeRatio);
2036 return false;
2037 }
2038 return true;
2039 }
2040
2041 // Check consistency of GC selection
2042 bool Arguments::check_gc_consistency() {
2043 check_gclog_consistency();
2044 bool status = true;
2045 // Ensure that the user has not selected conflicting sets
2046 // of collectors. [Note: this check is merely a user convenience;
2047 // collectors over-ride each other so that only a non-conflicting
2048 // set is selected; however what the user gets is not what they
2049 // may have expected from the combination they asked for. It's
2050 // better to reduce user confusion by not allowing them to
2051 // select conflicting combinations.
2052 uint i = 0;
2053 if (UseSerialGC) i++;
2054 if (UseConcMarkSweepGC || UseParNewGC) i++;
2055 if (UseParallelGC || UseParallelOldGC) i++;
2056 if (UseG1GC) i++;
2057 if (i > 1) {
2058 jio_fprintf(defaultStream::error_stream(),
2059 "Conflicting collector combinations in option list; "
2060 "please refer to the release notes for the combinations "
2061 "allowed\n");
2062 status = false;
2063 }
2064 return status;
2065 }
2066
2067 void Arguments::check_deprecated_gcs() {
2068 if (UseConcMarkSweepGC && !UseParNewGC) {
2069 warning("Using the DefNew young collector with the CMS collector is deprecated "
2070 "and will likely be removed in a future release");
2071 }
2072
2073 if (UseParNewGC && !UseConcMarkSweepGC) {
2074 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2075 // set up UseSerialGC properly, so that can't be used in the check here.
2076 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2077 "and will likely be removed in a future release");
2078 }
2079
2080 if (CMSIncrementalMode) {
2081 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2082 }
2083 }
2084
2085 void Arguments::check_deprecated_gc_flags() {
2086 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2087 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2088 "and will likely be removed in future release");
2089 }
2090 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2091 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2092 "Use MaxRAMFraction instead.");
2093 }
2094 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2095 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2096 }
2097 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2098 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2099 }
2100 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2101 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2102 }
2103 }
2104
2105 // Check stack pages settings
2106 bool Arguments::check_stack_pages()
2107 {
2108 bool status = true;
2109 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2110 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2111 // greater stack shadow pages can't generate instruction to bang stack
2112 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2113 return status;
2114 }
2115
2116 // Check the consistency of vm_init_args
2117 bool Arguments::check_vm_args_consistency() {
2118 // Method for adding checks for flag consistency.
2119 // The intent is to warn the user of all possible conflicts,
2120 // before returning an error.
2121 // Note: Needs platform-dependent factoring.
2122 bool status = true;
2123
2124 if (TLABRefillWasteFraction == 0) {
2125 jio_fprintf(defaultStream::error_stream(),
2126 "TLABRefillWasteFraction should be a denominator, "
2127 "not " SIZE_FORMAT "\n",
2128 TLABRefillWasteFraction);
2129 status = false;
2130 }
2131
2132 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2133 "AdaptiveSizePolicyWeight");
2134 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2135
2136 // Divide by bucket size to prevent a large size from causing rollover when
2137 // calculating amount of memory needed to be allocated for the String table.
2138 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2139 (max_uintx / StringTable::bucket_size()), "StringTable size");
2140
2141 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2142 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2143
2144 {
2145 // Using "else if" below to avoid printing two error messages if min > max.
2146 // This will also prevent us from reporting both min>100 and max>100 at the
2147 // same time, but that is less annoying than printing two identical errors IMHO.
2148 FormatBuffer<80> err_msg("%s","");
2149 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2150 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2151 status = false;
2152 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2153 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2154 status = false;
2155 }
2156 }
2157
2158 // Min/MaxMetaspaceFreeRatio
2159 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2160 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2161
2162 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2163 jio_fprintf(defaultStream::error_stream(),
2164 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2165 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2166 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2167 MinMetaspaceFreeRatio,
2168 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2169 MaxMetaspaceFreeRatio);
2170 status = false;
2171 }
2172
2173 // Trying to keep 100% free is not practical
2174 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2175
2176 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2177 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2178 }
2179
2180 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2181 // Settings to encourage splitting.
2182 if (!FLAG_IS_CMDLINE(NewRatio)) {
2183 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2184 }
2185 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2186 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2187 }
2188 }
2189
2190 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2191 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2192 }
2193
2194 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2195 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2196 if (GCTimeLimit == 100) {
2197 // Turn off gc-overhead-limit-exceeded checks
2198 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2199 }
2200
2201 status = status && check_gc_consistency();
2202 status = status && check_stack_pages();
2203
2204 if (CMSIncrementalMode) {
2205 if (!UseConcMarkSweepGC) {
2206 jio_fprintf(defaultStream::error_stream(),
2207 "error: invalid argument combination.\n"
2208 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2209 "selected in order\nto use CMSIncrementalMode.\n");
2210 status = false;
2211 } else {
2212 status = status && verify_percentage(CMSIncrementalDutyCycle,
2213 "CMSIncrementalDutyCycle");
2214 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2215 "CMSIncrementalDutyCycleMin");
2216 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2217 "CMSIncrementalSafetyFactor");
2218 status = status && verify_percentage(CMSIncrementalOffset,
2219 "CMSIncrementalOffset");
2220 status = status && verify_percentage(CMSExpAvgFactor,
2221 "CMSExpAvgFactor");
2222 // If it was not set on the command line, set
2223 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2224 if (CMSInitiatingOccupancyFraction < 0) {
2225 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2226 }
2227 }
2228 }
2229
2230 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2231 // insists that we hold the requisite locks so that the iteration is
2232 // MT-safe. For the verification at start-up and shut-down, we don't
2233 // yet have a good way of acquiring and releasing these locks,
2234 // which are not visible at the CollectedHeap level. We want to
2235 // be able to acquire these locks and then do the iteration rather
2236 // than just disable the lock verification. This will be fixed under
2237 // bug 4788986.
2238 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2239 if (VerifyDuringStartup) {
2240 warning("Heap verification at start-up disabled "
2241 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2242 VerifyDuringStartup = false; // Disable verification at start-up
2243 }
2244
2245 if (VerifyBeforeExit) {
2246 warning("Heap verification at shutdown disabled "
2247 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2248 VerifyBeforeExit = false; // Disable verification at shutdown
2249 }
2250 }
2251
2252 // Note: only executed in non-PRODUCT mode
2253 if (!UseAsyncConcMarkSweepGC &&
2254 (ExplicitGCInvokesConcurrent ||
2255 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2256 jio_fprintf(defaultStream::error_stream(),
2257 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2258 " with -UseAsyncConcMarkSweepGC");
2259 status = false;
2260 }
2261
2262 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2263
2264 #if INCLUDE_ALL_GCS
2265 if (UseG1GC) {
2266 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2267 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2268 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2269
2270 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2271 "InitiatingHeapOccupancyPercent");
2272 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2273 "G1RefProcDrainInterval");
2274 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2275 "G1ConcMarkStepDurationMillis");
2276 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2277 "G1ConcRSHotCardLimit");
2278 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2279 "G1ConcRSLogCacheSize");
2280 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2281 "StringDeduplicationAgeThreshold");
2282 }
2283 if (UseConcMarkSweepGC) {
2284 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2285 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2286 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2287 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2288
2289 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2290
2291 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2292 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2293 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2294
2295 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2296
2297 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2298 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2299
2300 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2301 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2302 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2303
2304 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2305
2306 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2307
2308 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2309 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2310 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2311 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2312 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2313 }
2314
2315 if (UseParallelGC || UseParallelOldGC) {
2316 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2317 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2318
2319 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2320 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2321
2322 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2323 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2324
2325 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2326
2327 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2328 }
2329 #endif // INCLUDE_ALL_GCS
2330
2331 status = status && verify_interval(RefDiscoveryPolicy,
2332 ReferenceProcessor::DiscoveryPolicyMin,
2333 ReferenceProcessor::DiscoveryPolicyMax,
2334 "RefDiscoveryPolicy");
2335
2336 // Limit the lower bound of this flag to 1 as it is used in a division
2337 // expression.
2338 status = status && verify_interval(TLABWasteTargetPercent,
2339 1, 100, "TLABWasteTargetPercent");
2340
2341 status = status && verify_object_alignment();
2342
2343 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2344 "CompressedClassSpaceSize");
2345
2346 status = status && verify_interval(MarkStackSizeMax,
2347 1, (max_jint - 1), "MarkStackSizeMax");
2348 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2349
2350 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2351
2352 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2353
2354 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2355
2356 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2357 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2358
2359 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2360
2361 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2362 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2363 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2364 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2365
2366 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2367 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2368
2369 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2370 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2371 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2372
2373 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2374 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2375
2376 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2377 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2378 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2379 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2380
2381 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2382 #ifdef COMPILER1
2383 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2384 #endif
2385
2386 if (PrintNMTStatistics) {
2387 #if INCLUDE_NMT
2388 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2389 #endif // INCLUDE_NMT
2390 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2391 PrintNMTStatistics = false;
2392 #if INCLUDE_NMT
2393 }
2394 #endif
2395 }
2396
2397 // Need to limit the extent of the padding to reasonable size.
2398 // 8K is well beyond the reasonable HW cache line size, even with the
2399 // aggressive prefetching, while still leaving the room for segregating
2400 // among the distinct pages.
2401 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2402 jio_fprintf(defaultStream::error_stream(),
2403 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2404 ContendedPaddingWidth, 0, 8192);
2405 status = false;
2406 }
2407
2408 // Need to enforce the padding not to break the existing field alignments.
2409 // It is sufficient to check against the largest type size.
2410 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2411 jio_fprintf(defaultStream::error_stream(),
2412 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2413 ContendedPaddingWidth, BytesPerLong);
2414 status = false;
2415 }
2416
2417 // Check lower bounds of the code cache
2418 // Template Interpreter code is approximately 3X larger in debug builds.
2419 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2420 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2423 os::vm_page_size()/K);
2424 status = false;
2425 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2426 jio_fprintf(defaultStream::error_stream(),
2427 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2428 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2429 status = false;
2430 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2431 jio_fprintf(defaultStream::error_stream(),
2432 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2433 min_code_cache_size/K);
2434 status = false;
2435 } else if (ReservedCodeCacheSize > 2*G) {
2436 // Code cache size larger than MAXINT is not supported.
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2439 (2*G)/M);
2440 status = false;
2441 }
2442
2443 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2444 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2445 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2446 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2447
2448 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2449 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2450 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2451 // Check the minimum number of compiler threads
2452 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2453
2454 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2455 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2456 }
2457
2458 return status;
2459 }
2460
2461 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2462 const char* option_type) {
2463 if (ignore) return false;
2464
2465 const char* spacer = " ";
2466 if (option_type == NULL) {
2467 option_type = ++spacer; // Set both to the empty string.
2468 }
2469
2470 if (os::obsolete_option(option)) {
2471 jio_fprintf(defaultStream::error_stream(),
2472 "Obsolete %s%soption: %s\n", option_type, spacer,
2473 option->optionString);
2474 return false;
2475 } else {
2476 jio_fprintf(defaultStream::error_stream(),
2477 "Unrecognized %s%soption: %s\n", option_type, spacer,
2478 option->optionString);
2479 return true;
2480 }
2481 }
2482
2483 static const char* user_assertion_options[] = {
2484 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2485 };
2486
2487 static const char* system_assertion_options[] = {
2488 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2489 };
2490
2491 // Return true if any of the strings in null-terminated array 'names' matches.
2492 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2493 // the option must match exactly.
2494 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2495 bool tail_allowed) {
2496 for (/* empty */; *names != NULL; ++names) {
2497 if (match_option(option, *names, tail)) {
2498 if (**tail == '\0' || tail_allowed && **tail == ':') {
2499 return true;
2500 }
2501 }
2502 }
2503 return false;
2504 }
2505
2506 bool Arguments::parse_uintx(const char* value,
2507 uintx* uintx_arg,
2508 uintx min_size) {
2509
2510 // Check the sign first since atomull() parses only unsigned values.
2511 bool value_is_positive = !(*value == '-');
2512
2513 if (value_is_positive) {
2514 julong n;
2515 bool good_return = atomull(value, &n);
2516 if (good_return) {
2517 bool above_minimum = n >= min_size;
2518 bool value_is_too_large = n > max_uintx;
2519
2520 if (above_minimum && !value_is_too_large) {
2521 *uintx_arg = n;
2522 return true;
2523 }
2524 }
2525 }
2526 return false;
2527 }
2528
2529 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2530 julong* long_arg,
2531 julong min_size) {
2532 if (!atomull(s, long_arg)) return arg_unreadable;
2533 return check_memory_size(*long_arg, min_size);
2534 }
2535
2536 // Parse JavaVMInitArgs structure
2537
2538 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2539 // For components of the system classpath.
2540 SysClassPath scp(Arguments::get_sysclasspath());
2541 bool scp_assembly_required = false;
2542
2543 // Save default settings for some mode flags
2544 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2545 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2546 Arguments::_ClipInlining = ClipInlining;
2547 Arguments::_BackgroundCompilation = BackgroundCompilation;
2548
2549 // Setup flags for mixed which is the default
2550 set_mode_flags(_mixed);
2551
2552 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2553 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2554 if (result != JNI_OK) {
2555 return result;
2556 }
2557
2558 // Parse JavaVMInitArgs structure passed in
2559 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2560 if (result != JNI_OK) {
2561 return result;
2562 }
2563
2564 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2565 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2566 if (result != JNI_OK) {
2567 return result;
2568 }
2569
2570 // Do final processing now that all arguments have been parsed
2571 result = finalize_vm_init_args(&scp, scp_assembly_required);
2572 if (result != JNI_OK) {
2573 return result;
2574 }
2575
2576 return JNI_OK;
2577 }
2578
2579 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2580 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2581 // are dealing with -agentpath (case where name is a path), otherwise with
2582 // -agentlib
2583 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2584 char *_name;
2585 const char *_hprof = "hprof", *_jdwp = "jdwp";
2586 size_t _len_hprof, _len_jdwp, _len_prefix;
2587
2588 if (is_path) {
2589 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2590 return false;
2591 }
2592
2593 _name++; // skip past last path separator
2594 _len_prefix = strlen(JNI_LIB_PREFIX);
2595
2596 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2597 return false;
2598 }
2599
2600 _name += _len_prefix;
2601 _len_hprof = strlen(_hprof);
2602 _len_jdwp = strlen(_jdwp);
2603
2604 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2605 _name += _len_hprof;
2606 }
2607 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2608 _name += _len_jdwp;
2609 }
2610 else {
2611 return false;
2612 }
2613
2614 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2615 return false;
2616 }
2617
2618 return true;
2619 }
2620
2621 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2622 return true;
2623 }
2624
2625 return false;
2626 }
2627
2628 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2629 SysClassPath* scp_p,
2630 bool* scp_assembly_required_p,
2631 Flag::Flags origin) {
2632 // Remaining part of option string
2633 const char* tail;
2634
2635 // iterate over arguments
2636 for (int index = 0; index < args->nOptions; index++) {
2637 bool is_absolute_path = false; // for -agentpath vs -agentlib
2638
2639 const JavaVMOption* option = args->options + index;
2640
2641 if (!match_option(option, "-Djava.class.path", &tail) &&
2642 !match_option(option, "-Dsun.java.command", &tail) &&
2643 !match_option(option, "-Dsun.java.launcher", &tail)) {
2644
2645 // add all jvm options to the jvm_args string. This string
2646 // is used later to set the java.vm.args PerfData string constant.
2647 // the -Djava.class.path and the -Dsun.java.command options are
2648 // omitted from jvm_args string as each have their own PerfData
2649 // string constant object.
2650 build_jvm_args(option->optionString);
2651 }
2652
2653 // -verbose:[class/gc/jni]
2654 if (match_option(option, "-verbose", &tail)) {
2655 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2656 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2657 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2658 } else if (!strcmp(tail, ":gc")) {
2659 FLAG_SET_CMDLINE(bool, PrintGC, true);
2660 } else if (!strcmp(tail, ":jni")) {
2661 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2662 }
2663 // -da / -ea / -disableassertions / -enableassertions
2664 // These accept an optional class/package name separated by a colon, e.g.,
2665 // -da:java.lang.Thread.
2666 } else if (match_option(option, user_assertion_options, &tail, true)) {
2667 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2668 if (*tail == '\0') {
2669 JavaAssertions::setUserClassDefault(enable);
2670 } else {
2671 assert(*tail == ':', "bogus match by match_option()");
2672 JavaAssertions::addOption(tail + 1, enable);
2673 }
2674 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2675 } else if (match_option(option, system_assertion_options, &tail, false)) {
2676 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2677 JavaAssertions::setSystemClassDefault(enable);
2678 // -bootclasspath:
2679 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2680 scp_p->reset_path(tail);
2681 *scp_assembly_required_p = true;
2682 // -bootclasspath/a:
2683 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2684 scp_p->add_suffix(tail);
2685 *scp_assembly_required_p = true;
2686 // -bootclasspath/p:
2687 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2688 scp_p->add_prefix(tail);
2689 *scp_assembly_required_p = true;
2690 // -Xrun
2691 } else if (match_option(option, "-Xrun", &tail)) {
2692 if (tail != NULL) {
2693 const char* pos = strchr(tail, ':');
2694 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2695 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2696 name[len] = '\0';
2697
2698 char *options = NULL;
2699 if(pos != NULL) {
2700 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2701 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2702 }
2703 #if !INCLUDE_JVMTI
2704 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2705 jio_fprintf(defaultStream::error_stream(),
2706 "Profiling and debugging agents are not supported in this VM\n");
2707 return JNI_ERR;
2708 }
2709 #endif // !INCLUDE_JVMTI
2710 add_init_library(name, options);
2711 }
2712 // -agentlib and -agentpath
2713 } else if (match_option(option, "-agentlib:", &tail) ||
2714 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2715 if(tail != NULL) {
2716 const char* pos = strchr(tail, '=');
2717 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2718 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2719 name[len] = '\0';
2720
2721 char *options = NULL;
2722 if(pos != NULL) {
2723 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2724 }
2725 #if !INCLUDE_JVMTI
2726 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2727 jio_fprintf(defaultStream::error_stream(),
2728 "Profiling and debugging agents are not supported in this VM\n");
2729 return JNI_ERR;
2730 }
2731 #endif // !INCLUDE_JVMTI
2732 add_init_agent(name, options, is_absolute_path);
2733 }
2734 // -javaagent
2735 } else if (match_option(option, "-javaagent:", &tail)) {
2736 #if !INCLUDE_JVMTI
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Instrumentation agents are not supported in this VM\n");
2739 return JNI_ERR;
2740 #else
2741 if(tail != NULL) {
2742 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2743 add_init_agent("instrument", options, false);
2744 }
2745 #endif // !INCLUDE_JVMTI
2746 // -Xnoclassgc
2747 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2748 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2749 // -Xincgc: i-CMS
2750 } else if (match_option(option, "-Xincgc", &tail)) {
2751 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2752 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2753 // -Xnoincgc: no i-CMS
2754 } else if (match_option(option, "-Xnoincgc", &tail)) {
2755 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2756 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2757 // -Xconcgc
2758 } else if (match_option(option, "-Xconcgc", &tail)) {
2759 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2760 // -Xnoconcgc
2761 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2762 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2763 // -Xbatch
2764 } else if (match_option(option, "-Xbatch", &tail)) {
2765 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2766 // -Xmn for compatibility with other JVM vendors
2767 } else if (match_option(option, "-Xmn", &tail)) {
2768 julong long_initial_young_size = 0;
2769 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2770 if (errcode != arg_in_range) {
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Invalid initial young generation size: %s\n", option->optionString);
2773 describe_range_error(errcode);
2774 return JNI_EINVAL;
2775 }
2776 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2777 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2778 // -Xms
2779 } else if (match_option(option, "-Xms", &tail)) {
2780 julong long_initial_heap_size = 0;
2781 // an initial heap size of 0 means automatically determine
2782 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2783 if (errcode != arg_in_range) {
2784 jio_fprintf(defaultStream::error_stream(),
2785 "Invalid initial heap size: %s\n", option->optionString);
2786 describe_range_error(errcode);
2787 return JNI_EINVAL;
2788 }
2789 set_min_heap_size((uintx)long_initial_heap_size);
2790 // Currently the minimum size and the initial heap sizes are the same.
2791 // Can be overridden with -XX:InitialHeapSize.
2792 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2793 // -Xmx
2794 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2795 julong long_max_heap_size = 0;
2796 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2797 if (errcode != arg_in_range) {
2798 jio_fprintf(defaultStream::error_stream(),
2799 "Invalid maximum heap size: %s\n", option->optionString);
2800 describe_range_error(errcode);
2801 return JNI_EINVAL;
2802 }
2803 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2804 // Xmaxf
2805 } else if (match_option(option, "-Xmaxf", &tail)) {
2806 char* err;
2807 int maxf = (int)(strtod(tail, &err) * 100);
2808 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Bad max heap free percentage size: %s\n",
2811 option->optionString);
2812 return JNI_EINVAL;
2813 } else {
2814 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2815 }
2816 // Xminf
2817 } else if (match_option(option, "-Xminf", &tail)) {
2818 char* err;
2819 int minf = (int)(strtod(tail, &err) * 100);
2820 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2821 jio_fprintf(defaultStream::error_stream(),
2822 "Bad min heap free percentage size: %s\n",
2823 option->optionString);
2824 return JNI_EINVAL;
2825 } else {
2826 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2827 }
2828 // -Xss
2829 } else if (match_option(option, "-Xss", &tail)) {
2830 julong long_ThreadStackSize = 0;
2831 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2832 if (errcode != arg_in_range) {
2833 jio_fprintf(defaultStream::error_stream(),
2834 "Invalid thread stack size: %s\n", option->optionString);
2835 describe_range_error(errcode);
2836 return JNI_EINVAL;
2837 }
2838 // Internally track ThreadStackSize in units of 1024 bytes.
2839 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2840 round_to((int)long_ThreadStackSize, K) / K);
2841 // -Xoss
2842 } else if (match_option(option, "-Xoss", &tail)) {
2843 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2844 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2845 julong long_CodeCacheExpansionSize = 0;
2846 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2847 if (errcode != arg_in_range) {
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2850 os::vm_page_size()/K);
2851 return JNI_EINVAL;
2852 }
2853 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2854 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2855 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2856 julong long_ReservedCodeCacheSize = 0;
2857
2858 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2859 if (errcode != arg_in_range) {
2860 jio_fprintf(defaultStream::error_stream(),
2861 "Invalid maximum code cache size: %s.\n", option->optionString);
2862 return JNI_EINVAL;
2863 }
2864 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2865 //-XX:IncreaseFirstTierCompileThresholdAt=
2866 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2867 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2868 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2871 option->optionString);
2872 return JNI_EINVAL;
2873 }
2874 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2875 // -green
2876 } else if (match_option(option, "-green", &tail)) {
2877 jio_fprintf(defaultStream::error_stream(),
2878 "Green threads support not available\n");
2879 return JNI_EINVAL;
2880 // -native
2881 } else if (match_option(option, "-native", &tail)) {
2882 // HotSpot always uses native threads, ignore silently for compatibility
2883 // -Xsqnopause
2884 } else if (match_option(option, "-Xsqnopause", &tail)) {
2885 // EVM option, ignore silently for compatibility
2886 // -Xrs
2887 } else if (match_option(option, "-Xrs", &tail)) {
2888 // Classic/EVM option, new functionality
2889 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2890 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2891 // change default internal VM signals used - lower case for back compat
2892 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2893 // -Xoptimize
2894 } else if (match_option(option, "-Xoptimize", &tail)) {
2895 // EVM option, ignore silently for compatibility
2896 // -Xprof
2897 } else if (match_option(option, "-Xprof", &tail)) {
2898 #if INCLUDE_FPROF
2899 _has_profile = true;
2900 #else // INCLUDE_FPROF
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Flat profiling is not supported in this VM.\n");
2903 return JNI_ERR;
2904 #endif // INCLUDE_FPROF
2905 // -Xconcurrentio
2906 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2907 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2908 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2909 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2910 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2911 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2912
2913 // -Xinternalversion
2914 } else if (match_option(option, "-Xinternalversion", &tail)) {
2915 jio_fprintf(defaultStream::output_stream(), "%s\n",
2916 VM_Version::internal_vm_info_string());
2917 vm_exit(0);
2918 #ifndef PRODUCT
2919 // -Xprintflags
2920 } else if (match_option(option, "-Xprintflags", &tail)) {
2921 CommandLineFlags::printFlags(tty, false);
2922 vm_exit(0);
2923 #endif
2924 // -D
2925 } else if (match_option(option, "-D", &tail)) {
2926 if (!add_property(tail)) {
2927 return JNI_ENOMEM;
2928 }
2929 // Out of the box management support
2930 if (match_option(option, "-Dcom.sun.management", &tail)) {
2931 #if INCLUDE_MANAGEMENT
2932 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2933 #else
2934 jio_fprintf(defaultStream::output_stream(),
2935 "-Dcom.sun.management is not supported in this VM.\n");
2936 return JNI_ERR;
2937 #endif
2938 }
2939 // -Xint
2940 } else if (match_option(option, "-Xint", &tail)) {
2941 set_mode_flags(_int);
2942 // -Xmixed
2943 } else if (match_option(option, "-Xmixed", &tail)) {
2944 set_mode_flags(_mixed);
2945 // -Xcomp
2946 } else if (match_option(option, "-Xcomp", &tail)) {
2947 // for testing the compiler; turn off all flags that inhibit compilation
2948 set_mode_flags(_comp);
2949 // -Xshare:dump
2950 } else if (match_option(option, "-Xshare:dump", &tail)) {
2951 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2952 set_mode_flags(_int); // Prevent compilation, which creates objects
2953 // -Xshare:on
2954 } else if (match_option(option, "-Xshare:on", &tail)) {
2955 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2956 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2957 // -Xshare:auto
2958 } else if (match_option(option, "-Xshare:auto", &tail)) {
2959 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2960 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2961 // -Xshare:off
2962 } else if (match_option(option, "-Xshare:off", &tail)) {
2963 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2964 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2965 // -Xverify
2966 } else if (match_option(option, "-Xverify", &tail)) {
2967 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2968 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2969 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2970 } else if (strcmp(tail, ":remote") == 0) {
2971 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2972 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2973 } else if (strcmp(tail, ":none") == 0) {
2974 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2975 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2976 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2977 return JNI_EINVAL;
2978 }
2979 // -Xdebug
2980 } else if (match_option(option, "-Xdebug", &tail)) {
2981 // note this flag has been used, then ignore
2982 set_xdebug_mode(true);
2983 // -Xnoagent
2984 } else if (match_option(option, "-Xnoagent", &tail)) {
2985 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2986 } else if (match_option(option, "-Xboundthreads", &tail)) {
2987 // Bind user level threads to kernel threads (Solaris only)
2988 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2989 } else if (match_option(option, "-Xloggc:", &tail)) {
2990 // Redirect GC output to the file. -Xloggc:<filename>
2991 // ostream_init_log(), when called will use this filename
2992 // to initialize a fileStream.
2993 _gc_log_filename = strdup(tail);
2994 if (!is_filename_valid(_gc_log_filename)) {
2995 jio_fprintf(defaultStream::output_stream(),
2996 "Invalid file name for use with -Xloggc: Filename can only contain the "
2997 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2998 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2999 return JNI_EINVAL;
3000 }
3001 FLAG_SET_CMDLINE(bool, PrintGC, true);
3002 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3003
3004 // JNI hooks
3005 } else if (match_option(option, "-Xcheck", &tail)) {
3006 if (!strcmp(tail, ":jni")) {
3007 #if !INCLUDE_JNI_CHECK
3008 warning("JNI CHECKING is not supported in this VM");
3009 #else
3010 CheckJNICalls = true;
3011 #endif // INCLUDE_JNI_CHECK
3012 } else if (is_bad_option(option, args->ignoreUnrecognized,
3013 "check")) {
3014 return JNI_EINVAL;
3015 }
3016 } else if (match_option(option, "vfprintf", &tail)) {
3017 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3018 } else if (match_option(option, "exit", &tail)) {
3019 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3020 } else if (match_option(option, "abort", &tail)) {
3021 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3022 // -XX:+AggressiveHeap
3023 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3024
3025 // This option inspects the machine and attempts to set various
3026 // parameters to be optimal for long-running, memory allocation
3027 // intensive jobs. It is intended for machines with large
3028 // amounts of cpu and memory.
3029
3030 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3031 // VM, but we may not be able to represent the total physical memory
3032 // available (like having 8gb of memory on a box but using a 32bit VM).
3033 // Thus, we need to make sure we're using a julong for intermediate
3034 // calculations.
3035 julong initHeapSize;
3036 julong total_memory = os::physical_memory();
3037
3038 if (total_memory < (julong)256*M) {
3039 jio_fprintf(defaultStream::error_stream(),
3040 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3041 vm_exit(1);
3042 }
3043
3044 // The heap size is half of available memory, or (at most)
3045 // all of possible memory less 160mb (leaving room for the OS
3046 // when using ISM). This is the maximum; because adaptive sizing
3047 // is turned on below, the actual space used may be smaller.
3048
3049 initHeapSize = MIN2(total_memory / (julong)2,
3050 total_memory - (julong)160*M);
3051
3052 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3053
3054 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3055 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3056 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3057 // Currently the minimum size and the initial heap sizes are the same.
3058 set_min_heap_size(initHeapSize);
3059 }
3060 if (FLAG_IS_DEFAULT(NewSize)) {
3061 // Make the young generation 3/8ths of the total heap.
3062 FLAG_SET_CMDLINE(uintx, NewSize,
3063 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3064 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3065 }
3066
3067 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3068 FLAG_SET_DEFAULT(UseLargePages, true);
3069 #endif
3070
3071 // Increase some data structure sizes for efficiency
3072 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3073 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3074 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3075
3076 // See the OldPLABSize comment below, but replace 'after promotion'
3077 // with 'after copying'. YoungPLABSize is the size of the survivor
3078 // space per-gc-thread buffers. The default is 4kw.
3079 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3080
3081 // OldPLABSize is the size of the buffers in the old gen that
3082 // UseParallelGC uses to promote live data that doesn't fit in the
3083 // survivor spaces. At any given time, there's one for each gc thread.
3084 // The default size is 1kw. These buffers are rarely used, since the
3085 // survivor spaces are usually big enough. For specjbb, however, there
3086 // are occasions when there's lots of live data in the young gen
3087 // and we end up promoting some of it. We don't have a definite
3088 // explanation for why bumping OldPLABSize helps, but the theory
3089 // is that a bigger PLAB results in retaining something like the
3090 // original allocation order after promotion, which improves mutator
3091 // locality. A minor effect may be that larger PLABs reduce the
3092 // number of PLAB allocation events during gc. The value of 8kw
3093 // was arrived at by experimenting with specjbb.
3094 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3095
3096 // Enable parallel GC and adaptive generation sizing
3097 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3098 FLAG_SET_DEFAULT(ParallelGCThreads,
3099 Abstract_VM_Version::parallel_worker_threads());
3100
3101 // Encourage steady state memory management
3102 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3103
3104 // This appears to improve mutator locality
3105 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3106
3107 // Get around early Solaris scheduling bug
3108 // (affinity vs other jobs on system)
3109 // but disallow DR and offlining (5008695).
3110 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3111
3112 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3113 // and the last option wins.
3114 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3115 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3116 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3117 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3118 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3119 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3120 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3121 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3122 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3123 uintx max_tenuring_thresh = 0;
3124 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3125 jio_fprintf(defaultStream::error_stream(),
3126 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3127 }
3128 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3129
3130 if (MaxTenuringThreshold == 0) {
3131 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3132 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3133 } else {
3134 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3135 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3136 }
3137 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3138 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3139 jio_fprintf(defaultStream::error_stream(),
3140 "Please use CMSClassUnloadingEnabled in place of "
3141 "CMSPermGenSweepingEnabled in the future\n");
3142 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3143 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3144 jio_fprintf(defaultStream::error_stream(),
3145 "Please use -XX:+UseGCOverheadLimit in place of "
3146 "-XX:+UseGCTimeLimit in the future\n");
3147 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3148 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3149 jio_fprintf(defaultStream::error_stream(),
3150 "Please use -XX:-UseGCOverheadLimit in place of "
3151 "-XX:-UseGCTimeLimit in the future\n");
3152 // The TLE options are for compatibility with 1.3 and will be
3153 // removed without notice in a future release. These options
3154 // are not to be documented.
3155 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3156 // No longer used.
3157 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3158 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3159 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3160 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3161 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3162 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3163 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3164 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3165 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3166 // No longer used.
3167 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3168 julong long_tlab_size = 0;
3169 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3170 if (errcode != arg_in_range) {
3171 jio_fprintf(defaultStream::error_stream(),
3172 "Invalid TLAB size: %s\n", option->optionString);
3173 describe_range_error(errcode);
3174 return JNI_EINVAL;
3175 }
3176 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3177 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3178 // No longer used.
3179 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3180 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3181 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3182 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3183 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3184 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3185 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3186 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3187 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3188 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3189 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3190 #if defined(DTRACE_ENABLED)
3191 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3192 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3193 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3194 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3195 #else // defined(DTRACE_ENABLED)
3196 jio_fprintf(defaultStream::error_stream(),
3197 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3198 return JNI_EINVAL;
3199 #endif // defined(DTRACE_ENABLED)
3200 #ifdef ASSERT
3201 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3202 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3203 // disable scavenge before parallel mark-compact
3204 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3205 #endif
3206 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3207 julong cms_blocks_to_claim = (julong)atol(tail);
3208 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3209 jio_fprintf(defaultStream::error_stream(),
3210 "Please use -XX:OldPLABSize in place of "
3211 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3212 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3213 julong cms_blocks_to_claim = (julong)atol(tail);
3214 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Please use -XX:OldPLABSize in place of "
3217 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3218 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3219 julong old_plab_size = 0;
3220 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3221 if (errcode != arg_in_range) {
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Invalid old PLAB size: %s\n", option->optionString);
3224 describe_range_error(errcode);
3225 return JNI_EINVAL;
3226 }
3227 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3228 jio_fprintf(defaultStream::error_stream(),
3229 "Please use -XX:OldPLABSize in place of "
3230 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3231 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3232 julong young_plab_size = 0;
3233 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3234 if (errcode != arg_in_range) {
3235 jio_fprintf(defaultStream::error_stream(),
3236 "Invalid young PLAB size: %s\n", option->optionString);
3237 describe_range_error(errcode);
3238 return JNI_EINVAL;
3239 }
3240 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3241 jio_fprintf(defaultStream::error_stream(),
3242 "Please use -XX:YoungPLABSize in place of "
3243 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3244 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3245 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3246 julong stack_size = 0;
3247 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3248 if (errcode != arg_in_range) {
3249 jio_fprintf(defaultStream::error_stream(),
3250 "Invalid mark stack size: %s\n", option->optionString);
3251 describe_range_error(errcode);
3252 return JNI_EINVAL;
3253 }
3254 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3255 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3256 julong max_stack_size = 0;
3257 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3258 if (errcode != arg_in_range) {
3259 jio_fprintf(defaultStream::error_stream(),
3260 "Invalid maximum mark stack size: %s\n",
3261 option->optionString);
3262 describe_range_error(errcode);
3263 return JNI_EINVAL;
3264 }
3265 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3266 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3267 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3268 uintx conc_threads = 0;
3269 if (!parse_uintx(tail, &conc_threads, 1)) {
3270 jio_fprintf(defaultStream::error_stream(),
3271 "Invalid concurrent threads: %s\n", option->optionString);
3272 return JNI_EINVAL;
3273 }
3274 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3275 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3276 julong max_direct_memory_size = 0;
3277 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3278 if (errcode != arg_in_range) {
3279 jio_fprintf(defaultStream::error_stream(),
3280 "Invalid maximum direct memory size: %s\n",
3281 option->optionString);
3282 describe_range_error(errcode);
3283 return JNI_EINVAL;
3284 }
3285 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3286 #if !INCLUDE_MANAGEMENT
3287 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3288 jio_fprintf(defaultStream::error_stream(),
3289 "ManagementServer is not supported in this VM.\n");
3290 return JNI_ERR;
3291 #endif // INCLUDE_MANAGEMENT
3292 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3293 // Skip -XX:Flags= since that case has already been handled
3294 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3295 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3296 return JNI_EINVAL;
3297 }
3298 }
3299 // Unknown option
3300 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3301 return JNI_ERR;
3302 }
3303 }
3304
3305 // Change the default value for flags which have different default values
3306 // when working with older JDKs.
3307 #ifdef LINUX
3308 if (JDK_Version::current().compare_major(6) <= 0 &&
3309 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3310 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3311 }
3312 #endif // LINUX
3313 return JNI_OK;
3314 }
3315
3316 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3317 // This must be done after all -D arguments have been processed.
3318 scp_p->expand_endorsed();
3319
3320 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3321 // Assemble the bootclasspath elements into the final path.
3322 Arguments::set_sysclasspath(scp_p->combined_path());
3323 }
3324
3325 // This must be done after all arguments have been processed.
3326 // java_compiler() true means set to "NONE" or empty.
3327 if (java_compiler() && !xdebug_mode()) {
3328 // For backwards compatibility, we switch to interpreted mode if
3329 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3330 // not specified.
3331 set_mode_flags(_int);
3332 }
3333 if (CompileThreshold == 0) {
3334 set_mode_flags(_int);
3335 }
3336
3337 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3338 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3339 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3340 }
3341
3342 #ifndef COMPILER2
3343 // Don't degrade server performance for footprint
3344 if (FLAG_IS_DEFAULT(UseLargePages) &&
3345 MaxHeapSize < LargePageHeapSizeThreshold) {
3346 // No need for large granularity pages w/small heaps.
3347 // Note that large pages are enabled/disabled for both the
3348 // Java heap and the code cache.
3349 FLAG_SET_DEFAULT(UseLargePages, false);
3350 }
3351
3352 #else
3353 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3354 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3355 }
3356 #endif
3357
3358 #ifndef TIERED
3359 // Tiered compilation is undefined.
3360 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3361 #endif
3362
3363 // If we are running in a headless jre, force java.awt.headless property
3364 // to be true unless the property has already been set.
3365 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3366 if (os::is_headless_jre()) {
3367 const char* headless = Arguments::get_property("java.awt.headless");
3368 if (headless == NULL) {
3369 char envbuffer[128];
3370 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3371 if (!add_property("java.awt.headless=true")) {
3372 return JNI_ENOMEM;
3373 }
3374 } else {
3375 char buffer[256];
3376 strcpy(buffer, "java.awt.headless=");
3377 strcat(buffer, envbuffer);
3378 if (!add_property(buffer)) {
3379 return JNI_ENOMEM;
3380 }
3381 }
3382 }
3383 }
3384
3385 if (!check_vm_args_consistency()) {
3386 return JNI_ERR;
3387 }
3388
3389 return JNI_OK;
3390 }
3391
3392 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3393 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3394 scp_assembly_required_p);
3395 }
3396
3397 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3398 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3399 scp_assembly_required_p);
3400 }
3401
3402 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3403 const int N_MAX_OPTIONS = 64;
3404 const int OPTION_BUFFER_SIZE = 1024;
3405 char buffer[OPTION_BUFFER_SIZE];
3406
3407 // The variable will be ignored if it exceeds the length of the buffer.
3408 // Don't check this variable if user has special privileges
3409 // (e.g. unix su command).
3410 if (os::getenv(name, buffer, sizeof(buffer)) &&
3411 !os::have_special_privileges()) {
3412 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3413 jio_fprintf(defaultStream::error_stream(),
3414 "Picked up %s: %s\n", name, buffer);
3415 char* rd = buffer; // pointer to the input string (rd)
3416 int i;
3417 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3418 while (isspace(*rd)) rd++; // skip whitespace
3419 if (*rd == 0) break; // we re done when the input string is read completely
3420
3421 // The output, option string, overwrites the input string.
3422 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3423 // input string (rd).
3424 char* wrt = rd;
3425
3426 options[i++].optionString = wrt; // Fill in option
3427 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3428 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3429 int quote = *rd; // matching quote to look for
3430 rd++; // don't copy open quote
3431 while (*rd != quote) { // include everything (even spaces) up until quote
3432 if (*rd == 0) { // string termination means unmatched string
3433 jio_fprintf(defaultStream::error_stream(),
3434 "Unmatched quote in %s\n", name);
3435 return JNI_ERR;
3436 }
3437 *wrt++ = *rd++; // copy to option string
3438 }
3439 rd++; // don't copy close quote
3440 } else {
3441 *wrt++ = *rd++; // copy to option string
3442 }
3443 }
3444 // Need to check if we're done before writing a NULL,
3445 // because the write could be to the byte that rd is pointing to.
3446 if (*rd++ == 0) {
3447 *wrt = 0;
3448 break;
3449 }
3450 *wrt = 0; // Zero terminate option
3451 }
3452 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3453 JavaVMInitArgs vm_args;
3454 vm_args.version = JNI_VERSION_1_2;
3455 vm_args.options = options;
3456 vm_args.nOptions = i;
3457 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3458
3459 if (PrintVMOptions) {
3460 const char* tail;
3461 for (int i = 0; i < vm_args.nOptions; i++) {
3462 const JavaVMOption *option = vm_args.options + i;
3463 if (match_option(option, "-XX:", &tail)) {
3464 logOption(tail);
3465 }
3466 }
3467 }
3468
3469 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3470 }
3471 return JNI_OK;
3472 }
3473
3474 void Arguments::set_shared_spaces_flags() {
3475 if (DumpSharedSpaces) {
3476 if (RequireSharedSpaces) {
3477 warning("cannot dump shared archive while using shared archive");
3478 }
3479 UseSharedSpaces = false;
3480 #ifdef _LP64
3481 if (!UseCompressedOops || !UseCompressedClassPointers) {
3482 vm_exit_during_initialization(
3483 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3484 }
3485 } else {
3486 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3487 if (!UseCompressedOops || !UseCompressedClassPointers) {
3488 no_shared_spaces();
3489 }
3490 #endif
3491 }
3492 }
3493
3494 #if !INCLUDE_ALL_GCS
3495 static void force_serial_gc() {
3496 FLAG_SET_DEFAULT(UseSerialGC, true);
3497 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3498 UNSUPPORTED_GC_OPTION(UseG1GC);
3499 UNSUPPORTED_GC_OPTION(UseParallelGC);
3500 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3501 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3502 UNSUPPORTED_GC_OPTION(UseParNewGC);
3503 }
3504 #endif // INCLUDE_ALL_GCS
3505
3506 // Sharing support
3507 // Construct the path to the archive
3508 static char* get_shared_archive_path() {
3509 char *shared_archive_path;
3510 if (SharedArchiveFile == NULL) {
3511 char jvm_path[JVM_MAXPATHLEN];
3512 os::jvm_path(jvm_path, sizeof(jvm_path));
3513 char *end = strrchr(jvm_path, *os::file_separator());
3514 if (end != NULL) *end = '\0';
3515 size_t jvm_path_len = strlen(jvm_path);
3516 size_t file_sep_len = strlen(os::file_separator());
3517 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3518 file_sep_len + 20, mtInternal);
3519 if (shared_archive_path != NULL) {
3520 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3521 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3522 strncat(shared_archive_path, "classes.jsa", 11);
3523 }
3524 } else {
3525 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3526 if (shared_archive_path != NULL) {
3527 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3528 }
3529 }
3530 return shared_archive_path;
3531 }
3532
3533 #ifndef PRODUCT
3534 // Determine whether LogVMOutput should be implicitly turned on.
3535 static bool use_vm_log() {
3536 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3537 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3538 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3539 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3540 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3541 return true;
3542 }
3543
3544 #ifdef COMPILER1
3545 if (PrintC1Statistics) {
3546 return true;
3547 }
3548 #endif // COMPILER1
3549
3550 #ifdef COMPILER2
3551 if (PrintOptoAssembly || PrintOptoStatistics) {
3552 return true;
3553 }
3554 #endif // COMPILER2
3555
3556 return false;
3557 }
3558 #endif // PRODUCT
3559
3560 // Parse entry point called from JNI_CreateJavaVM
3561
3562 jint Arguments::parse(const JavaVMInitArgs* args) {
3563
3564 // Remaining part of option string
3565 const char* tail;
3566
3567 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3568 const char* hotspotrc = ".hotspotrc";
3569 bool settings_file_specified = false;
3570 bool needs_hotspotrc_warning = false;
3571
3572 const char* flags_file;
3573 int index;
3574 for (index = 0; index < args->nOptions; index++) {
3575 const JavaVMOption *option = args->options + index;
3576 if (match_option(option, "-XX:Flags=", &tail)) {
3577 flags_file = tail;
3578 settings_file_specified = true;
3579 }
3580 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3581 PrintVMOptions = true;
3582 }
3583 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3584 PrintVMOptions = false;
3585 }
3586 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3587 IgnoreUnrecognizedVMOptions = true;
3588 }
3589 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3590 IgnoreUnrecognizedVMOptions = false;
3591 }
3592 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3593 CommandLineFlags::printFlags(tty, false);
3594 vm_exit(0);
3595 }
3596 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3597 #if INCLUDE_NMT
3598 MemTracker::init_tracking_options(tail);
3599 #else
3600 jio_fprintf(defaultStream::error_stream(),
3601 "Native Memory Tracking is not supported in this VM\n");
3602 return JNI_ERR;
3603 #endif
3604 }
3605
3606
3607 #ifndef PRODUCT
3608 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3609 CommandLineFlags::printFlags(tty, true);
3610 vm_exit(0);
3611 }
3612 #endif
3613 }
3614
3615 if (IgnoreUnrecognizedVMOptions) {
3616 // uncast const to modify the flag args->ignoreUnrecognized
3617 *(jboolean*)(&args->ignoreUnrecognized) = true;
3618 }
3619
3620 // Parse specified settings file
3621 if (settings_file_specified) {
3622 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3623 return JNI_EINVAL;
3624 }
3625 } else {
3626 #ifdef ASSERT
3627 // Parse default .hotspotrc settings file
3628 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3629 return JNI_EINVAL;
3630 }
3631 #else
3632 struct stat buf;
3633 if (os::stat(hotspotrc, &buf) == 0) {
3634 needs_hotspotrc_warning = true;
3635 }
3636 #endif
3637 }
3638
3639 if (PrintVMOptions) {
3640 for (index = 0; index < args->nOptions; index++) {
3641 const JavaVMOption *option = args->options + index;
3642 if (match_option(option, "-XX:", &tail)) {
3643 logOption(tail);
3644 }
3645 }
3646 }
3647
3648 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3649 jint result = parse_vm_init_args(args);
3650 if (result != JNI_OK) {
3651 return result;
3652 }
3653
3654 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3655 SharedArchivePath = get_shared_archive_path();
3656 if (SharedArchivePath == NULL) {
3657 return JNI_ENOMEM;
3658 }
3659
3660 // Delay warning until here so that we've had a chance to process
3661 // the -XX:-PrintWarnings flag
3662 if (needs_hotspotrc_warning) {
3663 warning("%s file is present but has been ignored. "
3664 "Run with -XX:Flags=%s to load the file.",
3665 hotspotrc, hotspotrc);
3666 }
3667
3668 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3669 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3670 #endif
3671
3672 #if INCLUDE_ALL_GCS
3673 #if (defined JAVASE_EMBEDDED || defined ARM)
3674 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3675 #endif
3676 #endif
3677
3678 #ifndef PRODUCT
3679 if (TraceBytecodesAt != 0) {
3680 TraceBytecodes = true;
3681 }
3682 if (CountCompiledCalls) {
3683 if (UseCounterDecay) {
3684 warning("UseCounterDecay disabled because CountCalls is set");
3685 UseCounterDecay = false;
3686 }
3687 }
3688 #endif // PRODUCT
3689
3690 if (ScavengeRootsInCode == 0) {
3691 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3692 warning("forcing ScavengeRootsInCode non-zero");
3693 }
3694 ScavengeRootsInCode = 1;
3695 }
3696
3697 if (PrintGCDetails) {
3698 // Turn on -verbose:gc options as well
3699 PrintGC = true;
3700 }
3701
3702 if (!JDK_Version::is_gte_jdk18x_version()) {
3703 // To avoid changing the log format for 7 updates this flag is only
3704 // true by default in JDK8 and above.
3705 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3706 FLAG_SET_DEFAULT(PrintGCCause, false);
3707 }
3708 }
3709
3710 // Set object alignment values.
3711 set_object_alignment();
3712
3713 #if !INCLUDE_ALL_GCS
3714 force_serial_gc();
3715 #endif // INCLUDE_ALL_GCS
3716 #if !INCLUDE_CDS
3717 if (DumpSharedSpaces || RequireSharedSpaces) {
3718 jio_fprintf(defaultStream::error_stream(),
3719 "Shared spaces are not supported in this VM\n");
3720 return JNI_ERR;
3721 }
3722 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3723 warning("Shared spaces are not supported in this VM");
3724 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3725 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3726 }
3727 no_shared_spaces();
3728 #endif // INCLUDE_CDS
3729
3730 return JNI_OK;
3731 }
3732
3733 jint Arguments::apply_ergo() {
3734
3735 // Set flags based on ergonomics.
3736 set_ergonomics_flags();
3737
3738 set_shared_spaces_flags();
3739
3740 // Check the GC selections again.
3741 if (!check_gc_consistency()) {
3742 return JNI_EINVAL;
3743 }
3744
3745 if (TieredCompilation) {
3746 set_tiered_flags();
3747 } else {
3748 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3749 if (CompilationPolicyChoice >= 2) {
3750 vm_exit_during_initialization(
3751 "Incompatible compilation policy selected", NULL);
3752 }
3753 }
3754 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3755 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3756 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3757 }
3758
3759
3760 // Set heap size based on available physical memory
3761 set_heap_size();
3762
3763 #if INCLUDE_ALL_GCS
3764 // Set per-collector flags
3765 if (UseParallelGC || UseParallelOldGC) {
3766 set_parallel_gc_flags();
3767 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3768 set_cms_and_parnew_gc_flags();
3769 } else if (UseParNewGC) { // Skipped if CMS is set above
3770 set_parnew_gc_flags();
3771 } else if (UseG1GC) {
3772 set_g1_gc_flags();
3773 }
3774 check_deprecated_gcs();
3775 check_deprecated_gc_flags();
3776 if (AssumeMP && !UseSerialGC) {
3777 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3778 warning("If the number of processors is expected to increase from one, then"
3779 " you should configure the number of parallel GC threads appropriately"
3780 " using -XX:ParallelGCThreads=N");
3781 }
3782 }
3783 if (MinHeapFreeRatio == 100) {
3784 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3785 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3786 }
3787 #else // INCLUDE_ALL_GCS
3788 assert(verify_serial_gc_flags(), "SerialGC unset");
3789 #endif // INCLUDE_ALL_GCS
3790
3791 // Initialize Metaspace flags and alignments
3792 Metaspace::ergo_initialize();
3793
3794 // Set bytecode rewriting flags
3795 set_bytecode_flags();
3796
3797 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3798 set_aggressive_opts_flags();
3799
3800 // Turn off biased locking for locking debug mode flags,
3801 // which are subtly different from each other but neither works with
3802 // biased locking
3803 if (UseHeavyMonitors
3804 #ifdef COMPILER1
3805 || !UseFastLocking
3806 #endif // COMPILER1
3807 ) {
3808 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3809 // flag set to true on command line; warn the user that they
3810 // can't enable biased locking here
3811 warning("Biased Locking is not supported with locking debug flags"
3812 "; ignoring UseBiasedLocking flag." );
3813 }
3814 UseBiasedLocking = false;
3815 }
3816
3817 #ifdef ZERO
3818 // Clear flags not supported on zero.
3819 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3820 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3821 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3822 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3823 #endif // CC_INTERP
3824
3825 #ifdef COMPILER2
3826 if (!EliminateLocks) {
3827 EliminateNestedLocks = false;
3828 }
3829 if (!Inline) {
3830 IncrementalInline = false;
3831 }
3832 #ifndef PRODUCT
3833 if (!IncrementalInline) {
3834 AlwaysIncrementalInline = false;
3835 }
3836 #endif
3837 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3838 // nothing to use the profiling, turn if off
3839 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3840 }
3841 #endif
3842
3843 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3844 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3845 DebugNonSafepoints = true;
3846 }
3847
3848 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3849 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3850 }
3851
3852 #ifndef PRODUCT
3853 if (CompileTheWorld) {
3854 // Force NmethodSweeper to sweep whole CodeCache each time.
3855 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3856 NmethodSweepFraction = 1;
3857 }
3858 }
3859
3860 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3861 if (use_vm_log()) {
3862 LogVMOutput = true;
3863 }
3864 }
3865 #endif // PRODUCT
3866
3867 if (PrintCommandLineFlags) {
3868 CommandLineFlags::printSetFlags(tty);
3869 }
3870
3871 // Apply CPU specific policy for the BiasedLocking
3872 if (UseBiasedLocking) {
3873 if (!VM_Version::use_biased_locking() &&
3874 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3875 UseBiasedLocking = false;
3876 }
3877 }
3878 #ifdef COMPILER2
3879 if (!UseBiasedLocking || EmitSync != 0) {
3880 UseOptoBiasInlining = false;
3881 }
3882 #endif
3883
3884 return JNI_OK;
3885 }
3886
3887 jint Arguments::adjust_after_os() {
3888 if (UseNUMA) {
3889 if (UseParallelGC || UseParallelOldGC) {
3890 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3891 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3892 }
3893 }
3894 // UseNUMAInterleaving is set to ON for all collectors and
3895 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3896 // such as the parallel collector for Linux and Solaris will
3897 // interleave old gen and survivor spaces on top of NUMA
3898 // allocation policy for the eden space.
3899 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3900 // all platforms and ParallelGC on Windows will interleave all
3901 // of the heap spaces across NUMA nodes.
3902 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3903 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3904 }
3905 }
3906 return JNI_OK;
3907 }
3908
3909 int Arguments::PropertyList_count(SystemProperty* pl) {
3910 int count = 0;
3911 while(pl != NULL) {
3912 count++;
3913 pl = pl->next();
3914 }
3915 return count;
3916 }
3917
3918 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3919 assert(key != NULL, "just checking");
3920 SystemProperty* prop;
3921 for (prop = pl; prop != NULL; prop = prop->next()) {
3922 if (strcmp(key, prop->key()) == 0) return prop->value();
3923 }
3924 return NULL;
3925 }
3926
3927 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3928 int count = 0;
3929 const char* ret_val = NULL;
3930
3931 while(pl != NULL) {
3932 if(count >= index) {
3933 ret_val = pl->key();
3934 break;
3935 }
3936 count++;
3937 pl = pl->next();
3938 }
3939
3940 return ret_val;
3941 }
3942
3943 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3944 int count = 0;
3945 char* ret_val = NULL;
3946
3947 while(pl != NULL) {
3948 if(count >= index) {
3949 ret_val = pl->value();
3950 break;
3951 }
3952 count++;
3953 pl = pl->next();
3954 }
3955
3956 return ret_val;
3957 }
3958
3959 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3960 SystemProperty* p = *plist;
3961 if (p == NULL) {
3962 *plist = new_p;
3963 } else {
3964 while (p->next() != NULL) {
3965 p = p->next();
3966 }
3967 p->set_next(new_p);
3968 }
3969 }
3970
3971 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3972 if (plist == NULL)
3973 return;
3974
3975 SystemProperty* new_p = new SystemProperty(k, v, true);
3976 PropertyList_add(plist, new_p);
3977 }
3978
3979 // This add maintains unique property key in the list.
3980 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3981 if (plist == NULL)
3982 return;
3983
3984 // If property key exist then update with new value.
3985 SystemProperty* prop;
3986 for (prop = *plist; prop != NULL; prop = prop->next()) {
3987 if (strcmp(k, prop->key()) == 0) {
3988 if (append) {
3989 prop->append_value(v);
3990 } else {
3991 prop->set_value(v);
3992 }
3993 return;
3994 }
3995 }
3996
3997 PropertyList_add(plist, k, v);
3998 }
3999
4000 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4001 // Returns true if all of the source pointed by src has been copied over to
4002 // the destination buffer pointed by buf. Otherwise, returns false.
4003 // Notes:
4004 // 1. If the length (buflen) of the destination buffer excluding the
4005 // NULL terminator character is not long enough for holding the expanded
4006 // pid characters, it also returns false instead of returning the partially
4007 // expanded one.
4008 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4009 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4010 char* buf, size_t buflen) {
4011 const char* p = src;
4012 char* b = buf;
4013 const char* src_end = &src[srclen];
4014 char* buf_end = &buf[buflen - 1];
4015
4016 while (p < src_end && b < buf_end) {
4017 if (*p == '%') {
4018 switch (*(++p)) {
4019 case '%': // "%%" ==> "%"
4020 *b++ = *p++;
4021 break;
4022 case 'p': { // "%p" ==> current process id
4023 // buf_end points to the character before the last character so
4024 // that we could write '\0' to the end of the buffer.
4025 size_t buf_sz = buf_end - b + 1;
4026 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4027
4028 // if jio_snprintf fails or the buffer is not long enough to hold
4029 // the expanded pid, returns false.
4030 if (ret < 0 || ret >= (int)buf_sz) {
4031 return false;
4032 } else {
4033 b += ret;
4034 assert(*b == '\0', "fail in copy_expand_pid");
4035 if (p == src_end && b == buf_end + 1) {
4036 // reach the end of the buffer.
4037 return true;
4038 }
4039 }
4040 p++;
4041 break;
4042 }
4043 default :
4044 *b++ = '%';
4045 }
4046 } else {
4047 *b++ = *p++;
4048 }
4049 }
4050 *b = '\0';
4051 return (p == src_end); // return false if not all of the source was copied
4052 }