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/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "runtime/os.hpp"
42 #include "runtime/vm_version.hpp"
43 #include "services/management.hpp"
44 #include "services/memTracker.hpp"
45 #include "utilities/defaultStream.hpp"
46 #include "utilities/macros.hpp"
47 #include "utilities/stringUtils.hpp"
48 #include "utilities/taskqueue.hpp"
49 #if INCLUDE_ALL_GCS
50 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
51 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
52 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
53 #endif // INCLUDE_ALL_GCS
54
55 // Note: This is a special bug reporting site for the JVM
56 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
57 #define DEFAULT_JAVA_LAUNCHER "generic"
58
59 // Disable options not supported in this release, with a warning if they
60 // were explicitly requested on the command-line
61 #define UNSUPPORTED_OPTION(opt, description) \
62 do { \
63 if (opt) { \
64 if (FLAG_IS_CMDLINE(opt)) { \
65 warning(description " is disabled in this release."); \
66 } \
67 FLAG_SET_DEFAULT(opt, false); \
68 } \
69 } while(0)
70
71 #define UNSUPPORTED_GC_OPTION(gc) \
72 do { \
73 if (gc) { \
74 if (FLAG_IS_CMDLINE(gc)) { \
75 warning(#gc " is not supported in this VM. Using Serial GC."); \
76 } \
77 FLAG_SET_DEFAULT(gc, false); \
78 } \
79 } while(0)
80
81 char** Arguments::_jvm_flags_array = NULL;
82 int Arguments::_num_jvm_flags = 0;
83 char** Arguments::_jvm_args_array = NULL;
84 int Arguments::_num_jvm_args = 0;
85 char* Arguments::_java_command = NULL;
86 SystemProperty* Arguments::_system_properties = NULL;
87 const char* Arguments::_gc_log_filename = NULL;
88 bool Arguments::_has_profile = false;
89 size_t Arguments::_conservative_max_heap_alignment = 0;
90 uintx Arguments::_min_heap_size = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 bool Arguments::_java_compiler = false;
93 bool Arguments::_xdebug_mode = false;
94 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
95 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
96 int Arguments::_sun_java_launcher_pid = -1;
97 bool Arguments::_sun_java_launcher_is_altjvm = false;
98
99 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
100 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
101 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
102 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
103 bool Arguments::_ClipInlining = ClipInlining;
104
105 char* Arguments::SharedArchivePath = NULL;
106
107 AgentLibraryList Arguments::_libraryList;
108 AgentLibraryList Arguments::_agentList;
109
110 abort_hook_t Arguments::_abort_hook = NULL;
111 exit_hook_t Arguments::_exit_hook = NULL;
112 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
113
114
115 SystemProperty *Arguments::_java_ext_dirs = NULL;
116 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
117 SystemProperty *Arguments::_sun_boot_library_path = NULL;
118 SystemProperty *Arguments::_java_library_path = NULL;
119 SystemProperty *Arguments::_java_home = NULL;
120 SystemProperty *Arguments::_java_class_path = NULL;
121 SystemProperty *Arguments::_sun_boot_class_path = NULL;
122
123 char* Arguments::_meta_index_path = NULL;
124 char* Arguments::_meta_index_dir = NULL;
125
126 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
127
128 static bool match_option(const JavaVMOption *option, const char* name,
129 const char** tail) {
130 int len = (int)strlen(name);
131 if (strncmp(option->optionString, name, len) == 0) {
132 *tail = option->optionString + len;
133 return true;
134 } else {
135 return false;
136 }
137 }
138
139 static void logOption(const char* opt) {
140 if (PrintVMOptions) {
141 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
142 }
143 }
144
145 // Process java launcher properties.
146 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
147 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
148 // sun.java.launcher.pid is defined.
149 // Must do this before setting up other system properties,
150 // as some of them may depend on launcher type.
151 for (int index = 0; index < args->nOptions; index++) {
152 const JavaVMOption* option = args->options + index;
153 const char* tail;
154
155 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
156 process_java_launcher_argument(tail, option->extraInfo);
157 continue;
158 }
159 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
160 if (strcmp(tail, "true") == 0) {
161 _sun_java_launcher_is_altjvm = true;
162 }
163 continue;
164 }
165 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
166 _sun_java_launcher_pid = atoi(tail);
167 continue;
168 }
169 }
170 }
171
172 // Initialize system properties key and value.
173 void Arguments::init_system_properties() {
174
175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
176 "Java Virtual Machine Specification", false));
177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
179 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
180
181 // Following are JVMTI agent writable properties.
182 // Properties values are set to NULL and they are
183 // os specific they are initialized in os::init_system_properties_values().
184 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
185 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
186 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
187 _java_library_path = new SystemProperty("java.library.path", NULL, true);
188 _java_home = new SystemProperty("java.home", NULL, true);
189 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
190
191 _java_class_path = new SystemProperty("java.class.path", "", true);
192
193 // Add to System Property list.
194 PropertyList_add(&_system_properties, _java_ext_dirs);
195 PropertyList_add(&_system_properties, _java_endorsed_dirs);
196 PropertyList_add(&_system_properties, _sun_boot_library_path);
197 PropertyList_add(&_system_properties, _java_library_path);
198 PropertyList_add(&_system_properties, _java_home);
199 PropertyList_add(&_system_properties, _java_class_path);
200 PropertyList_add(&_system_properties, _sun_boot_class_path);
201
202 // Set OS specific system properties values
203 os::init_system_properties_values();
204 }
205
206
207 // Update/Initialize System properties after JDK version number is known
208 void Arguments::init_version_specific_system_properties() {
209 enum { bufsz = 16 };
210 char buffer[bufsz];
211 const char* spec_vendor = "Sun Microsystems Inc.";
212 uint32_t spec_version = 0;
213
214 spec_vendor = "Oracle Corporation";
215 spec_version = JDK_Version::current().major_version();
216 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
217
218 PropertyList_add(&_system_properties,
219 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
220 PropertyList_add(&_system_properties,
221 new SystemProperty("java.vm.specification.version", buffer, false));
222 PropertyList_add(&_system_properties,
223 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
224 }
225
226 /**
227 * Provide a slightly more user-friendly way of eliminating -XX flags.
228 * When a flag is eliminated, it can be added to this list in order to
229 * continue accepting this flag on the command-line, while issuing a warning
230 * and ignoring the value. Once the JDK version reaches the 'accept_until'
231 * limit, we flatly refuse to admit the existence of the flag. This allows
232 * a flag to die correctly over JDK releases using HSX.
233 */
234 typedef struct {
235 const char* name;
236 JDK_Version obsoleted_in; // when the flag went away
237 JDK_Version accept_until; // which version to start denying the existence
238 } ObsoleteFlag;
239
240 static ObsoleteFlag obsolete_jvm_flags[] = {
241 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
242 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
243 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
244 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
255 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
256 { "DefaultInitialRAMFraction",
257 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
258 { "UseDepthFirstScavengeOrder",
259 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
260 { "HandlePromotionFailure",
261 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
262 { "MaxLiveObjectEvacuationRatio",
263 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
264 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
265 { "UseParallelOldGCCompacting",
266 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
267 { "UseParallelDensePrefixUpdate",
268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
269 { "UseParallelOldGCDensePrefix",
270 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
271 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
272 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
273 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
274 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
275 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
276 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
292 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
293 #ifdef PRODUCT
294 { "DesiredMethodLimit",
295 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
296 #endif // PRODUCT
297 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
299 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
300 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
301 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { NULL, JDK_Version(0), JDK_Version(0) }
306 };
307
308 // Returns true if the flag is obsolete and fits into the range specified
309 // for being ignored. In the case that the flag is ignored, the 'version'
310 // value is filled in with the version number when the flag became
311 // obsolete so that that value can be displayed to the user.
312 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
313 int i = 0;
314 assert(version != NULL, "Must provide a version buffer");
315 while (obsolete_jvm_flags[i].name != NULL) {
316 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
317 // <flag>=xxx form
318 // [-|+]<flag> form
319 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
320 ((s[0] == '+' || s[0] == '-') &&
321 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
322 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
323 *version = flag_status.obsoleted_in;
324 return true;
325 }
326 }
327 i++;
328 }
329 return false;
330 }
331
332 // Constructs the system class path (aka boot class path) from the following
333 // components, in order:
334 //
335 // prefix // from -Xbootclasspath/p:...
336 // endorsed // the expansion of -Djava.endorsed.dirs=...
337 // base // from os::get_system_properties() or -Xbootclasspath=
338 // suffix // from -Xbootclasspath/a:...
339 //
340 // java.endorsed.dirs is a list of directories; any jar or zip files in the
341 // directories are added to the sysclasspath just before the base.
342 //
343 // This could be AllStatic, but it isn't needed after argument processing is
344 // complete.
345 class SysClassPath: public StackObj {
346 public:
347 SysClassPath(const char* base);
348 ~SysClassPath();
349
350 inline void set_base(const char* base);
351 inline void add_prefix(const char* prefix);
352 inline void add_suffix_to_prefix(const char* suffix);
353 inline void add_suffix(const char* suffix);
354 inline void reset_path(const char* base);
355
356 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
357 // property. Must be called after all command-line arguments have been
358 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
359 // combined_path().
360 void expand_endorsed();
361
362 inline const char* get_base() const { return _items[_scp_base]; }
363 inline const char* get_prefix() const { return _items[_scp_prefix]; }
364 inline const char* get_suffix() const { return _items[_scp_suffix]; }
365 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
366
367 // Combine all the components into a single c-heap-allocated string; caller
368 // must free the string if/when no longer needed.
369 char* combined_path();
370
371 private:
372 // Utility routines.
373 static char* add_to_path(const char* path, const char* str, bool prepend);
374 static char* add_jars_to_path(char* path, const char* directory);
375
376 inline void reset_item_at(int index);
377
378 // Array indices for the items that make up the sysclasspath. All except the
379 // base are allocated in the C heap and freed by this class.
380 enum {
381 _scp_prefix, // from -Xbootclasspath/p:...
382 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
383 _scp_base, // the default sysclasspath
384 _scp_suffix, // from -Xbootclasspath/a:...
385 _scp_nitems // the number of items, must be last.
386 };
387
388 const char* _items[_scp_nitems];
389 DEBUG_ONLY(bool _expansion_done;)
390 };
391
392 SysClassPath::SysClassPath(const char* base) {
393 memset(_items, 0, sizeof(_items));
394 _items[_scp_base] = base;
395 DEBUG_ONLY(_expansion_done = false;)
396 }
397
398 SysClassPath::~SysClassPath() {
399 // Free everything except the base.
400 for (int i = 0; i < _scp_nitems; ++i) {
401 if (i != _scp_base) reset_item_at(i);
402 }
403 DEBUG_ONLY(_expansion_done = false;)
404 }
405
406 inline void SysClassPath::set_base(const char* base) {
407 _items[_scp_base] = base;
408 }
409
410 inline void SysClassPath::add_prefix(const char* prefix) {
411 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
412 }
413
414 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
415 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
416 }
417
418 inline void SysClassPath::add_suffix(const char* suffix) {
419 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
420 }
421
422 inline void SysClassPath::reset_item_at(int index) {
423 assert(index < _scp_nitems && index != _scp_base, "just checking");
424 if (_items[index] != NULL) {
425 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
426 _items[index] = NULL;
427 }
428 }
429
430 inline void SysClassPath::reset_path(const char* base) {
431 // Clear the prefix and suffix.
432 reset_item_at(_scp_prefix);
433 reset_item_at(_scp_suffix);
434 set_base(base);
435 }
436
437 //------------------------------------------------------------------------------
438
439 void SysClassPath::expand_endorsed() {
440 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
441
442 const char* path = Arguments::get_property("java.endorsed.dirs");
443 if (path == NULL) {
444 path = Arguments::get_endorsed_dir();
445 assert(path != NULL, "no default for java.endorsed.dirs");
446 }
447
448 char* expanded_path = NULL;
449 const char separator = *os::path_separator();
450 const char* const end = path + strlen(path);
451 while (path < end) {
452 const char* tmp_end = strchr(path, separator);
453 if (tmp_end == NULL) {
454 expanded_path = add_jars_to_path(expanded_path, path);
455 path = end;
456 } else {
457 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
458 memcpy(dirpath, path, tmp_end - path);
459 dirpath[tmp_end - path] = '\0';
460 expanded_path = add_jars_to_path(expanded_path, dirpath);
461 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
462 path = tmp_end + 1;
463 }
464 }
465 _items[_scp_endorsed] = expanded_path;
466 DEBUG_ONLY(_expansion_done = true;)
467 }
468
469 // Combine the bootclasspath elements, some of which may be null, into a single
470 // c-heap-allocated string.
471 char* SysClassPath::combined_path() {
472 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
473 assert(_expansion_done, "must call expand_endorsed() first.");
474
475 size_t lengths[_scp_nitems];
476 size_t total_len = 0;
477
478 const char separator = *os::path_separator();
479
480 // Get the lengths.
481 int i;
482 for (i = 0; i < _scp_nitems; ++i) {
483 if (_items[i] != NULL) {
484 lengths[i] = strlen(_items[i]);
485 // Include space for the separator char (or a NULL for the last item).
486 total_len += lengths[i] + 1;
487 }
488 }
489 assert(total_len > 0, "empty sysclasspath not allowed");
490
491 // Copy the _items to a single string.
492 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
493 char* cp_tmp = cp;
494 for (i = 0; i < _scp_nitems; ++i) {
495 if (_items[i] != NULL) {
496 memcpy(cp_tmp, _items[i], lengths[i]);
497 cp_tmp += lengths[i];
498 *cp_tmp++ = separator;
499 }
500 }
501 *--cp_tmp = '\0'; // Replace the extra separator.
502 return cp;
503 }
504
505 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
506 char*
507 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
508 char *cp;
509
510 assert(str != NULL, "just checking");
511 if (path == NULL) {
512 size_t len = strlen(str) + 1;
513 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
514 memcpy(cp, str, len); // copy the trailing null
515 } else {
516 const char separator = *os::path_separator();
517 size_t old_len = strlen(path);
518 size_t str_len = strlen(str);
519 size_t len = old_len + str_len + 2;
520
521 if (prepend) {
522 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
523 char* cp_tmp = cp;
524 memcpy(cp_tmp, str, str_len);
525 cp_tmp += str_len;
526 *cp_tmp = separator;
527 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
528 FREE_C_HEAP_ARRAY(char, path, mtInternal);
529 } else {
530 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
531 char* cp_tmp = cp + old_len;
532 *cp_tmp = separator;
533 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
534 }
535 }
536 return cp;
537 }
538
539 // Scan the directory and append any jar or zip files found to path.
540 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
541 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
542 DIR* dir = os::opendir(directory);
543 if (dir == NULL) return path;
544
545 char dir_sep[2] = { '\0', '\0' };
546 size_t directory_len = strlen(directory);
547 const char fileSep = *os::file_separator();
548 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
549
550 /* Scan the directory for jars/zips, appending them to path. */
551 struct dirent *entry;
552 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
553 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
554 const char* name = entry->d_name;
555 const char* ext = name + strlen(name) - 4;
556 bool isJarOrZip = ext > name &&
557 (os::file_name_strcmp(ext, ".jar") == 0 ||
558 os::file_name_strcmp(ext, ".zip") == 0);
559 if (isJarOrZip) {
560 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
561 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
562 path = add_to_path(path, jarpath, false);
563 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
564 }
565 }
566 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
567 os::closedir(dir);
568 return path;
569 }
570
571 // Parses a memory size specification string.
572 static bool atomull(const char *s, julong* result) {
573 julong n = 0;
574 int args_read = 0;
575 bool is_hex = false;
576 // Skip leading 0[xX] for hexadecimal
577 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
578 s += 2;
579 is_hex = true;
580 args_read = sscanf(s, JULONG_FORMAT_X, &n);
581 } else {
582 args_read = sscanf(s, JULONG_FORMAT, &n);
583 }
584 if (args_read != 1) {
585 return false;
586 }
587 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
588 s++;
589 }
590 // 4705540: illegal if more characters are found after the first non-digit
591 if (strlen(s) > 1) {
592 return false;
593 }
594 switch (*s) {
595 case 'T': case 't':
596 *result = n * G * K;
597 // Check for overflow.
598 if (*result/((julong)G * K) != n) return false;
599 return true;
600 case 'G': case 'g':
601 *result = n * G;
602 if (*result/G != n) return false;
603 return true;
604 case 'M': case 'm':
605 *result = n * M;
606 if (*result/M != n) return false;
607 return true;
608 case 'K': case 'k':
609 *result = n * K;
610 if (*result/K != n) return false;
611 return true;
612 case '\0':
613 *result = n;
614 return true;
615 default:
616 return false;
617 }
618 }
619
620 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
621 if (size < min_size) return arg_too_small;
622 // Check that size will fit in a size_t (only relevant on 32-bit)
623 if (size > max_uintx) return arg_too_big;
624 return arg_in_range;
625 }
626
627 // Describe an argument out of range error
628 void Arguments::describe_range_error(ArgsRange errcode) {
629 switch(errcode) {
630 case arg_too_big:
631 jio_fprintf(defaultStream::error_stream(),
632 "The specified size exceeds the maximum "
633 "representable size.\n");
634 break;
635 case arg_too_small:
636 case arg_unreadable:
637 case arg_in_range:
638 // do nothing for now
639 break;
640 default:
641 ShouldNotReachHere();
642 }
643 }
644
645 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
646 return CommandLineFlags::boolAtPut(name, &value, origin);
647 }
648
649 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
650 double v;
651 if (sscanf(value, "%lf", &v) != 1) {
652 return false;
653 }
654
655 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
656 return true;
657 }
658 return false;
659 }
660
661 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
662 julong v;
663 intx intx_v;
664 bool is_neg = false;
665 // Check the sign first since atomull() parses only unsigned values.
666 if (*value == '-') {
667 if (!CommandLineFlags::intxAt(name, &intx_v)) {
668 return false;
669 }
670 value++;
671 is_neg = true;
672 }
673 if (!atomull(value, &v)) {
674 return false;
675 }
676 intx_v = (intx) v;
677 if (is_neg) {
678 intx_v = -intx_v;
679 }
680 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
681 return true;
682 }
683 uintx uintx_v = (uintx) v;
684 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
685 return true;
686 }
687 uint64_t uint64_t_v = (uint64_t) v;
688 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
689 return true;
690 }
691 return false;
692 }
693
694 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
695 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
696 // Contract: CommandLineFlags always returns a pointer that needs freeing.
697 FREE_C_HEAP_ARRAY(char, value, mtInternal);
698 return true;
699 }
700
701 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
702 const char* old_value = "";
703 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
704 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
705 size_t new_len = strlen(new_value);
706 const char* value;
707 char* free_this_too = NULL;
708 if (old_len == 0) {
709 value = new_value;
710 } else if (new_len == 0) {
711 value = old_value;
712 } else {
713 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
714 // each new setting adds another LINE to the switch:
715 sprintf(buf, "%s\n%s", old_value, new_value);
716 value = buf;
717 free_this_too = buf;
718 }
719 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
720 // CommandLineFlags always returns a pointer that needs freeing.
721 FREE_C_HEAP_ARRAY(char, value, mtInternal);
722 if (free_this_too != NULL) {
723 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
724 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
725 }
726 return true;
727 }
728
729 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
730
731 // range of acceptable characters spelled out for portability reasons
732 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
733 #define BUFLEN 255
734 char name[BUFLEN+1];
735 char dummy;
736
737 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
738 return set_bool_flag(name, false, origin);
739 }
740 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
741 return set_bool_flag(name, true, origin);
742 }
743
744 char punct;
745 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
746 const char* value = strchr(arg, '=') + 1;
747 Flag* flag = Flag::find_flag(name, strlen(name));
748 if (flag != NULL && flag->is_ccstr()) {
749 if (flag->ccstr_accumulates()) {
750 return append_to_string_flag(name, value, origin);
751 } else {
752 if (value[0] == '\0') {
753 value = NULL;
754 }
755 return set_string_flag(name, value, origin);
756 }
757 }
758 }
759
760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
761 const char* value = strchr(arg, '=') + 1;
762 // -XX:Foo:=xxx will reset the string flag to the given value.
763 if (value[0] == '\0') {
764 value = NULL;
765 }
766 return set_string_flag(name, value, origin);
767 }
768
769 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
770 #define SIGNED_NUMBER_RANGE "[-0123456789]"
771 #define NUMBER_RANGE "[0123456789]"
772 char value[BUFLEN + 1];
773 char value2[BUFLEN + 1];
774 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
775 // Looks like a floating-point number -- try again with more lenient format string
776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
777 return set_fp_numeric_flag(name, value, origin);
778 }
779 }
780
781 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
782 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
783 return set_numeric_flag(name, value, origin);
784 }
785
786 return false;
787 }
788
789 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
790 assert(bldarray != NULL, "illegal argument");
791
792 if (arg == NULL) {
793 return;
794 }
795
796 int new_count = *count + 1;
797
798 // expand the array and add arg to the last element
799 if (*bldarray == NULL) {
800 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
801 } else {
802 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
803 }
804 (*bldarray)[*count] = strdup(arg);
805 *count = new_count;
806 }
807
808 void Arguments::build_jvm_args(const char* arg) {
809 add_string(&_jvm_args_array, &_num_jvm_args, arg);
810 }
811
812 void Arguments::build_jvm_flags(const char* arg) {
813 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
814 }
815
816 // utility function to return a string that concatenates all
817 // strings in a given char** array
818 const char* Arguments::build_resource_string(char** args, int count) {
819 if (args == NULL || count == 0) {
820 return NULL;
821 }
822 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
823 for (int i = 1; i < count; i++) {
824 length += strlen(args[i]) + 1; // add 1 for a space
825 }
826 char* s = NEW_RESOURCE_ARRAY(char, length);
827 strcpy(s, args[0]);
828 for (int j = 1; j < count; j++) {
829 strcat(s, " ");
830 strcat(s, args[j]);
831 }
832 return (const char*) s;
833 }
834
835 void Arguments::print_on(outputStream* st) {
836 st->print_cr("VM Arguments:");
837 if (num_jvm_flags() > 0) {
838 st->print("jvm_flags: "); print_jvm_flags_on(st);
839 }
840 if (num_jvm_args() > 0) {
841 st->print("jvm_args: "); print_jvm_args_on(st);
842 }
843 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
844 if (_java_class_path != NULL) {
845 char* path = _java_class_path->value();
846 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
847 }
848 st->print_cr("Launcher Type: %s", _sun_java_launcher);
849 }
850
851 void Arguments::print_jvm_flags_on(outputStream* st) {
852 if (_num_jvm_flags > 0) {
853 for (int i=0; i < _num_jvm_flags; i++) {
854 st->print("%s ", _jvm_flags_array[i]);
855 }
856 st->cr();
857 }
858 }
859
860 void Arguments::print_jvm_args_on(outputStream* st) {
861 if (_num_jvm_args > 0) {
862 for (int i=0; i < _num_jvm_args; i++) {
863 st->print("%s ", _jvm_args_array[i]);
864 }
865 st->cr();
866 }
867 }
868
869 bool Arguments::process_argument(const char* arg,
870 jboolean ignore_unrecognized, Flag::Flags origin) {
871
872 JDK_Version since = JDK_Version();
873
874 if (parse_argument(arg, origin) || ignore_unrecognized) {
875 return true;
876 }
877
878 bool has_plus_minus = (*arg == '+' || *arg == '-');
879 const char* const argname = has_plus_minus ? arg + 1 : arg;
880 if (is_newly_obsolete(arg, &since)) {
881 char version[256];
882 since.to_string(version, sizeof(version));
883 warning("ignoring option %s; support was removed in %s", argname, version);
884 return true;
885 }
886
887 // For locked flags, report a custom error message if available.
888 // Otherwise, report the standard unrecognized VM option.
889
890 size_t arg_len;
891 const char* equal_sign = strchr(argname, '=');
892 if (equal_sign == NULL) {
893 arg_len = strlen(argname);
894 } else {
895 arg_len = equal_sign - argname;
896 }
897
898 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
899 if (found_flag != NULL) {
900 char locked_message_buf[BUFLEN];
901 found_flag->get_locked_message(locked_message_buf, BUFLEN);
902 if (strlen(locked_message_buf) == 0) {
903 if (found_flag->is_bool() && !has_plus_minus) {
904 jio_fprintf(defaultStream::error_stream(),
905 "Missing +/- setting for VM option '%s'\n", argname);
906 } else if (!found_flag->is_bool() && has_plus_minus) {
907 jio_fprintf(defaultStream::error_stream(),
908 "Unexpected +/- setting in VM option '%s'\n", argname);
909 } else {
910 jio_fprintf(defaultStream::error_stream(),
911 "Improperly specified VM option '%s'\n", argname);
912 }
913 } else {
914 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
915 }
916 } else {
917 jio_fprintf(defaultStream::error_stream(),
918 "Unrecognized VM option '%s'\n", argname);
919 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
920 if (fuzzy_matched != NULL) {
921 jio_fprintf(defaultStream::error_stream(),
922 "Did you mean '%s%s%s'?\n",
923 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
924 fuzzy_matched->_name,
925 (fuzzy_matched->is_bool()) ? "" : "=<value>");
926 }
927 }
928
929 // allow for commandline "commenting out" options like -XX:#+Verbose
930 return arg[0] == '#';
931 }
932
933 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
934 FILE* stream = fopen(file_name, "rb");
935 if (stream == NULL) {
936 if (should_exist) {
937 jio_fprintf(defaultStream::error_stream(),
938 "Could not open settings file %s\n", file_name);
939 return false;
940 } else {
941 return true;
942 }
943 }
944
945 char token[1024];
946 int pos = 0;
947
948 bool in_white_space = true;
949 bool in_comment = false;
950 bool in_quote = false;
951 char quote_c = 0;
952 bool result = true;
953
954 int c = getc(stream);
955 while(c != EOF && pos < (int)(sizeof(token)-1)) {
956 if (in_white_space) {
957 if (in_comment) {
958 if (c == '\n') in_comment = false;
959 } else {
960 if (c == '#') in_comment = true;
961 else if (!isspace(c)) {
962 in_white_space = false;
963 token[pos++] = c;
964 }
965 }
966 } else {
967 if (c == '\n' || (!in_quote && isspace(c))) {
968 // token ends at newline, or at unquoted whitespace
969 // this allows a way to include spaces in string-valued options
970 token[pos] = '\0';
971 logOption(token);
972 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
973 build_jvm_flags(token);
974 pos = 0;
975 in_white_space = true;
976 in_quote = false;
977 } else if (!in_quote && (c == '\'' || c == '"')) {
978 in_quote = true;
979 quote_c = c;
980 } else if (in_quote && (c == quote_c)) {
981 in_quote = false;
982 } else {
983 token[pos++] = c;
984 }
985 }
986 c = getc(stream);
987 }
988 if (pos > 0) {
989 token[pos] = '\0';
990 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
991 build_jvm_flags(token);
992 }
993 fclose(stream);
994 return result;
995 }
996
997 //=============================================================================================================
998 // Parsing of properties (-D)
999
1000 const char* Arguments::get_property(const char* key) {
1001 return PropertyList_get_value(system_properties(), key);
1002 }
1003
1004 bool Arguments::add_property(const char* prop) {
1005 const char* eq = strchr(prop, '=');
1006 char* key;
1007 // ns must be static--its address may be stored in a SystemProperty object.
1008 const static char ns[1] = {0};
1009 char* value = (char *)ns;
1010
1011 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1012 key = AllocateHeap(key_len + 1, mtInternal);
1013 strncpy(key, prop, key_len);
1014 key[key_len] = '\0';
1015
1016 if (eq != NULL) {
1017 size_t value_len = strlen(prop) - key_len - 1;
1018 value = AllocateHeap(value_len + 1, mtInternal);
1019 strncpy(value, &prop[key_len + 1], value_len + 1);
1020 }
1021
1022 if (strcmp(key, "java.compiler") == 0) {
1023 process_java_compiler_argument(value);
1024 FreeHeap(key);
1025 if (eq != NULL) {
1026 FreeHeap(value);
1027 }
1028 return true;
1029 } else if (strcmp(key, "sun.java.command") == 0) {
1030 _java_command = value;
1031
1032 // Record value in Arguments, but let it get passed to Java.
1033 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1034 strcmp(key, "sun.java.launcher.pid") == 0) {
1035 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1036 // private and are processed in process_sun_java_launcher_properties();
1037 // the sun.java.launcher property is passed on to the java application
1038 FreeHeap(key);
1039 if (eq != NULL) {
1040 FreeHeap(value);
1041 }
1042 return true;
1043 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1044 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1045 // its value without going through the property list or making a Java call.
1046 _java_vendor_url_bug = value;
1047 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1048 PropertyList_unique_add(&_system_properties, key, value, true);
1049 return true;
1050 }
1051 // Create new property and add at the end of the list
1052 PropertyList_unique_add(&_system_properties, key, value);
1053 return true;
1054 }
1055
1056 //===========================================================================================================
1057 // Setting int/mixed/comp mode flags
1058
1059 void Arguments::set_mode_flags(Mode mode) {
1060 // Set up default values for all flags.
1061 // If you add a flag to any of the branches below,
1062 // add a default value for it here.
1063 set_java_compiler(false);
1064 _mode = mode;
1065
1066 // Ensure Agent_OnLoad has the correct initial values.
1067 // This may not be the final mode; mode may change later in onload phase.
1068 PropertyList_unique_add(&_system_properties, "java.vm.info",
1069 (char*)VM_Version::vm_info_string(), false);
1070
1071 UseInterpreter = true;
1072 UseCompiler = true;
1073 UseLoopCounter = true;
1074
1075 #ifndef ZERO
1076 // Turn these off for mixed and comp. Leave them on for Zero.
1077 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1078 UseFastAccessorMethods = (mode == _int);
1079 }
1080 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1081 UseFastEmptyMethods = (mode == _int);
1082 }
1083 #endif
1084
1085 // Default values may be platform/compiler dependent -
1086 // use the saved values
1087 ClipInlining = Arguments::_ClipInlining;
1088 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1089 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1090 BackgroundCompilation = Arguments::_BackgroundCompilation;
1091
1092 // Change from defaults based on mode
1093 switch (mode) {
1094 default:
1095 ShouldNotReachHere();
1096 break;
1097 case _int:
1098 UseCompiler = false;
1099 UseLoopCounter = false;
1100 AlwaysCompileLoopMethods = false;
1101 UseOnStackReplacement = false;
1102 break;
1103 case _mixed:
1104 // same as default
1105 break;
1106 case _comp:
1107 UseInterpreter = false;
1108 BackgroundCompilation = false;
1109 ClipInlining = false;
1110 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1111 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1112 // compile a level 4 (C2) and then continue executing it.
1113 if (TieredCompilation) {
1114 Tier3InvokeNotifyFreqLog = 0;
1115 Tier4InvocationThreshold = 0;
1116 }
1117 break;
1118 }
1119 }
1120
1121 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1122 // Conflict: required to use shared spaces (-Xshare:on), but
1123 // incompatible command line options were chosen.
1124
1125 static void no_shared_spaces(const char* message) {
1126 if (RequireSharedSpaces) {
1127 jio_fprintf(defaultStream::error_stream(),
1128 "Class data sharing is inconsistent with other specified options.\n");
1129 vm_exit_during_initialization("Unable to use shared archive.", message);
1130 } else {
1131 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1132 }
1133 }
1134 #endif
1135
1136 void Arguments::set_tiered_flags() {
1137 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1138 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1139 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1140 }
1141 if (CompilationPolicyChoice < 2) {
1142 vm_exit_during_initialization(
1143 "Incompatible compilation policy selected", NULL);
1144 }
1145 // Increase the code cache size - tiered compiles a lot more.
1146 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1147 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1148 }
1149 if (!UseInterpreter) { // -Xcomp
1150 Tier3InvokeNotifyFreqLog = 0;
1151 Tier4InvocationThreshold = 0;
1152 }
1153 }
1154
1155 /**
1156 * Returns the minimum number of compiler threads needed to run the JVM. The following
1157 * configurations are possible.
1158 *
1159 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1160 * compiler threads is 0.
1161 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1162 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1163 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1164 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1165 * C1 can be used, so the minimum number of compiler threads is 1.
1166 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1167 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1168 * the minimum number of compiler threads is 2.
1169 */
1170 int Arguments::get_min_number_of_compiler_threads() {
1171 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1172 return 0; // case 1
1173 #else
1174 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1175 return 1; // case 2 or case 3
1176 }
1177 return 2; // case 4 (tiered)
1178 #endif
1179 }
1180
1181 #if INCLUDE_ALL_GCS
1182 static void disable_adaptive_size_policy(const char* collector_name) {
1183 if (UseAdaptiveSizePolicy) {
1184 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1185 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1186 collector_name);
1187 }
1188 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1189 }
1190 }
1191
1192 void Arguments::set_parnew_gc_flags() {
1193 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1194 "control point invariant");
1195 assert(UseParNewGC, "Error");
1196
1197 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1198 disable_adaptive_size_policy("UseParNewGC");
1199
1200 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1201 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1202 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1203 } else if (ParallelGCThreads == 0) {
1204 jio_fprintf(defaultStream::error_stream(),
1205 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1206 vm_exit(1);
1207 }
1208
1209 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1210 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1211 // we set them to 1024 and 1024.
1212 // See CR 6362902.
1213 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1214 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1215 }
1216 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1217 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1218 }
1219
1220 // When using compressed oops, we use local overflow stacks,
1221 // rather than using a global overflow list chained through
1222 // the klass word of the object's pre-image.
1223 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1224 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1225 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1226 }
1227 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1228 }
1229 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1230 }
1231
1232 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1233 // sparc/solaris for certain applications, but would gain from
1234 // further optimization and tuning efforts, and would almost
1235 // certainly gain from analysis of platform and environment.
1236 void Arguments::set_cms_and_parnew_gc_flags() {
1237 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1238 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1239
1240 // If we are using CMS, we prefer to UseParNewGC,
1241 // unless explicitly forbidden.
1242 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1243 FLAG_SET_ERGO(bool, UseParNewGC, true);
1244 }
1245
1246 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1247 disable_adaptive_size_policy("UseConcMarkSweepGC");
1248
1249 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1250 // as needed.
1251 if (UseParNewGC) {
1252 set_parnew_gc_flags();
1253 }
1254
1255 size_t max_heap = align_size_down(MaxHeapSize,
1256 CardTableRS::ct_max_alignment_constraint());
1257
1258 // Now make adjustments for CMS
1259 intx tenuring_default = (intx)6;
1260 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1261
1262 // Preferred young gen size for "short" pauses:
1263 // upper bound depends on # of threads and NewRatio.
1264 const uintx parallel_gc_threads =
1265 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1266 const size_t preferred_max_new_size_unaligned =
1267 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1268 size_t preferred_max_new_size =
1269 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1270
1271 // Unless explicitly requested otherwise, size young gen
1272 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1273
1274 // If either MaxNewSize or NewRatio is set on the command line,
1275 // assume the user is trying to set the size of the young gen.
1276 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1277
1278 // Set MaxNewSize to our calculated preferred_max_new_size unless
1279 // NewSize was set on the command line and it is larger than
1280 // preferred_max_new_size.
1281 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1282 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1283 } else {
1284 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1285 }
1286 if (PrintGCDetails && Verbose) {
1287 // Too early to use gclog_or_tty
1288 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1289 }
1290
1291 // Code along this path potentially sets NewSize and OldSize
1292 if (PrintGCDetails && Verbose) {
1293 // Too early to use gclog_or_tty
1294 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1295 " initial_heap_size: " SIZE_FORMAT
1296 " max_heap: " SIZE_FORMAT,
1297 min_heap_size(), InitialHeapSize, max_heap);
1298 }
1299 size_t min_new = preferred_max_new_size;
1300 if (FLAG_IS_CMDLINE(NewSize)) {
1301 min_new = NewSize;
1302 }
1303 if (max_heap > min_new && min_heap_size() > min_new) {
1304 // Unless explicitly requested otherwise, make young gen
1305 // at least min_new, and at most preferred_max_new_size.
1306 if (FLAG_IS_DEFAULT(NewSize)) {
1307 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1308 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1309 if (PrintGCDetails && Verbose) {
1310 // Too early to use gclog_or_tty
1311 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1312 }
1313 }
1314 // Unless explicitly requested otherwise, size old gen
1315 // so it's NewRatio x of NewSize.
1316 if (FLAG_IS_DEFAULT(OldSize)) {
1317 if (max_heap > NewSize) {
1318 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1319 if (PrintGCDetails && Verbose) {
1320 // Too early to use gclog_or_tty
1321 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1322 }
1323 }
1324 }
1325 }
1326 }
1327 // Unless explicitly requested otherwise, definitely
1328 // promote all objects surviving "tenuring_default" scavenges.
1329 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1330 FLAG_IS_DEFAULT(SurvivorRatio)) {
1331 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1332 }
1333 // If we decided above (or user explicitly requested)
1334 // `promote all' (via MaxTenuringThreshold := 0),
1335 // prefer minuscule survivor spaces so as not to waste
1336 // space for (non-existent) survivors
1337 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1338 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1339 }
1340 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1341 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1342 // This is done in order to make ParNew+CMS configuration to work
1343 // with YoungPLABSize and OldPLABSize options.
1344 // See CR 6362902.
1345 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1346 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1347 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1348 // is. In this situation let CMSParPromoteBlocksToClaim follow
1349 // the value (either from the command line or ergonomics) of
1350 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1351 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1352 } else {
1353 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1354 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1355 // we'll let it to take precedence.
1356 jio_fprintf(defaultStream::error_stream(),
1357 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1358 " options are specified for the CMS collector."
1359 " CMSParPromoteBlocksToClaim will take precedence.\n");
1360 }
1361 }
1362 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1363 // OldPLAB sizing manually turned off: Use a larger default setting,
1364 // unless it was manually specified. This is because a too-low value
1365 // will slow down scavenges.
1366 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1367 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1368 }
1369 }
1370 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1371 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1372 // If either of the static initialization defaults have changed, note this
1373 // modification.
1374 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1375 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1376 }
1377 if (PrintGCDetails && Verbose) {
1378 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1379 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1380 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1381 }
1382 }
1383 #endif // INCLUDE_ALL_GCS
1384
1385 void set_object_alignment() {
1386 // Object alignment.
1387 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1388 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1389 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1390 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1391 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1392 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1393
1394 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1395 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1396
1397 // Oop encoding heap max
1398 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1399
1400 #if INCLUDE_ALL_GCS
1401 // Set CMS global values
1402 CompactibleFreeListSpace::set_cms_values();
1403 #endif // INCLUDE_ALL_GCS
1404 }
1405
1406 bool verify_object_alignment() {
1407 // Object alignment.
1408 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1409 jio_fprintf(defaultStream::error_stream(),
1410 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1411 (int)ObjectAlignmentInBytes);
1412 return false;
1413 }
1414 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1415 jio_fprintf(defaultStream::error_stream(),
1416 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1417 (int)ObjectAlignmentInBytes, BytesPerLong);
1418 return false;
1419 }
1420 // It does not make sense to have big object alignment
1421 // since a space lost due to alignment will be greater
1422 // then a saved space from compressed oops.
1423 if ((int)ObjectAlignmentInBytes > 256) {
1424 jio_fprintf(defaultStream::error_stream(),
1425 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1426 (int)ObjectAlignmentInBytes);
1427 return false;
1428 }
1429 // In case page size is very small.
1430 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1431 jio_fprintf(defaultStream::error_stream(),
1432 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1433 (int)ObjectAlignmentInBytes, os::vm_page_size());
1434 return false;
1435 }
1436 if(SurvivorAlignmentInBytes == 0) {
1437 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1438 } else {
1439 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1440 jio_fprintf(defaultStream::error_stream(),
1441 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1442 (int)SurvivorAlignmentInBytes);
1443 return false;
1444 }
1445 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1446 jio_fprintf(defaultStream::error_stream(),
1447 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1448 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1449 return false;
1450 }
1451 }
1452 return true;
1453 }
1454
1455 size_t Arguments::max_heap_for_compressed_oops() {
1456 // Avoid sign flip.
1457 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1458 // We need to fit both the NULL page and the heap into the memory budget, while
1459 // keeping alignment constraints of the heap. To guarantee the latter, as the
1460 // NULL page is located before the heap, we pad the NULL page to the conservative
1461 // maximum alignment that the GC may ever impose upon the heap.
1462 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1463 _conservative_max_heap_alignment);
1464
1465 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1466 NOT_LP64(ShouldNotReachHere(); return 0);
1467 }
1468
1469 bool Arguments::should_auto_select_low_pause_collector() {
1470 if (UseAutoGCSelectPolicy &&
1471 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1472 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1473 if (PrintGCDetails) {
1474 // Cannot use gclog_or_tty yet.
1475 tty->print_cr("Automatic selection of the low pause collector"
1476 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1477 }
1478 return true;
1479 }
1480 return false;
1481 }
1482
1483 void Arguments::set_use_compressed_oops() {
1484 #ifndef ZERO
1485 #ifdef _LP64
1486 // MaxHeapSize is not set up properly at this point, but
1487 // the only value that can override MaxHeapSize if we are
1488 // to use UseCompressedOops is InitialHeapSize.
1489 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1490
1491 if (max_heap_size <= max_heap_for_compressed_oops()) {
1492 #if !defined(COMPILER1) || defined(TIERED)
1493 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1494 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1495 }
1496 #endif
1497 #ifdef _WIN64
1498 if (UseLargePages && UseCompressedOops) {
1499 // Cannot allocate guard pages for implicit checks in indexed addressing
1500 // mode, when large pages are specified on windows.
1501 // This flag could be switched ON if narrow oop base address is set to 0,
1502 // see code in Universe::initialize_heap().
1503 Universe::set_narrow_oop_use_implicit_null_checks(false);
1504 }
1505 #endif // _WIN64
1506 } else {
1507 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1508 warning("Max heap size too large for Compressed Oops");
1509 FLAG_SET_DEFAULT(UseCompressedOops, false);
1510 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1511 }
1512 }
1513 #endif // _LP64
1514 #endif // ZERO
1515 }
1516
1517
1518 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1519 // set_use_compressed_oops().
1520 void Arguments::set_use_compressed_klass_ptrs() {
1521 #ifndef ZERO
1522 #ifdef _LP64
1523 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1524 if (!UseCompressedOops) {
1525 if (UseCompressedClassPointers) {
1526 warning("UseCompressedClassPointers requires UseCompressedOops");
1527 }
1528 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1529 } else {
1530 // Turn on UseCompressedClassPointers too
1531 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1532 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1533 }
1534 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1535 if (UseCompressedClassPointers) {
1536 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1537 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1538 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1539 }
1540 }
1541 }
1542 #endif // _LP64
1543 #endif // !ZERO
1544 }
1545
1546 void Arguments::set_conservative_max_heap_alignment() {
1547 // The conservative maximum required alignment for the heap is the maximum of
1548 // the alignments imposed by several sources: any requirements from the heap
1549 // itself, the collector policy and the maximum page size we may run the VM
1550 // with.
1551 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1552 #if INCLUDE_ALL_GCS
1553 if (UseParallelGC) {
1554 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1555 } else if (UseG1GC) {
1556 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1557 }
1558 #endif // INCLUDE_ALL_GCS
1559 _conservative_max_heap_alignment = MAX4(heap_alignment,
1560 (size_t)os::vm_allocation_granularity(),
1561 os::max_page_size(),
1562 CollectorPolicy::compute_heap_alignment());
1563 }
1564
1565 void Arguments::set_ergonomics_flags() {
1566
1567 if (os::is_server_class_machine()) {
1568 // If no other collector is requested explicitly,
1569 // let the VM select the collector based on
1570 // machine class and automatic selection policy.
1571 if (!UseSerialGC &&
1572 !UseConcMarkSweepGC &&
1573 !UseG1GC &&
1574 !UseParNewGC &&
1575 FLAG_IS_DEFAULT(UseParallelGC)) {
1576 if (should_auto_select_low_pause_collector()) {
1577 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1578 } else {
1579 FLAG_SET_ERGO(bool, UseParallelGC, true);
1580 }
1581 }
1582 }
1583 #ifdef COMPILER2
1584 // Shared spaces work fine with other GCs but causes bytecode rewriting
1585 // to be disabled, which hurts interpreter performance and decreases
1586 // server performance. When -server is specified, keep the default off
1587 // unless it is asked for. Future work: either add bytecode rewriting
1588 // at link time, or rewrite bytecodes in non-shared methods.
1589 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1590 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1591 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1592 }
1593 #endif
1594
1595 set_conservative_max_heap_alignment();
1596
1597 #ifndef ZERO
1598 #ifdef _LP64
1599 set_use_compressed_oops();
1600
1601 // set_use_compressed_klass_ptrs() must be called after calling
1602 // set_use_compressed_oops().
1603 set_use_compressed_klass_ptrs();
1604
1605 // Also checks that certain machines are slower with compressed oops
1606 // in vm_version initialization code.
1607 #endif // _LP64
1608 #endif // !ZERO
1609 }
1610
1611 void Arguments::set_parallel_gc_flags() {
1612 assert(UseParallelGC || UseParallelOldGC, "Error");
1613 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1614 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1615 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1616 }
1617 FLAG_SET_DEFAULT(UseParallelGC, true);
1618
1619 // If no heap maximum was requested explicitly, use some reasonable fraction
1620 // of the physical memory, up to a maximum of 1GB.
1621 FLAG_SET_DEFAULT(ParallelGCThreads,
1622 Abstract_VM_Version::parallel_worker_threads());
1623 if (ParallelGCThreads == 0) {
1624 jio_fprintf(defaultStream::error_stream(),
1625 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1626 vm_exit(1);
1627 }
1628
1629 if (UseAdaptiveSizePolicy) {
1630 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1631 // unless the user actually sets these flags.
1632 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1633 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1634 }
1635 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1636 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1637 }
1638 }
1639
1640 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1641 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1642 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1643 // See CR 6362902 for details.
1644 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1645 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1646 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1647 }
1648 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1649 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1650 }
1651 }
1652
1653 if (UseParallelOldGC) {
1654 // Par compact uses lower default values since they are treated as
1655 // minimums. These are different defaults because of the different
1656 // interpretation and are not ergonomically set.
1657 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1658 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1659 }
1660 }
1661 }
1662
1663 void Arguments::set_g1_gc_flags() {
1664 assert(UseG1GC, "Error");
1665 #ifdef COMPILER1
1666 FastTLABRefill = false;
1667 #endif
1668 FLAG_SET_DEFAULT(ParallelGCThreads,
1669 Abstract_VM_Version::parallel_worker_threads());
1670 if (ParallelGCThreads == 0) {
1671 FLAG_SET_DEFAULT(ParallelGCThreads,
1672 Abstract_VM_Version::parallel_worker_threads());
1673 }
1674
1675 // MarkStackSize will be set (if it hasn't been set by the user)
1676 // when concurrent marking is initialized.
1677 // Its value will be based upon the number of parallel marking threads.
1678 // But we do set the maximum mark stack size here.
1679 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1680 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1681 }
1682
1683 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1684 // In G1, we want the default GC overhead goal to be higher than
1685 // say in PS. So we set it here to 10%. Otherwise the heap might
1686 // be expanded more aggressively than we would like it to. In
1687 // fact, even 10% seems to not be high enough in some cases
1688 // (especially small GC stress tests that the main thing they do
1689 // is allocation). We might consider increase it further.
1690 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1691 }
1692
1693 if (PrintGCDetails && Verbose) {
1694 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1695 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1696 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1697 }
1698 }
1699
1700 julong Arguments::limit_by_allocatable_memory(julong limit) {
1701 julong max_allocatable;
1702 julong result = limit;
1703 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1704 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1705 }
1706 return result;
1707 }
1708
1709 // Use static initialization to get the default before parsing
1710 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1711
1712 void Arguments::set_heap_size() {
1713 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1714 // Deprecated flag
1715 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1716 }
1717
1718 const julong phys_mem =
1719 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1720 : (julong)MaxRAM;
1721
1722 // If the maximum heap size has not been set with -Xmx,
1723 // then set it as fraction of the size of physical memory,
1724 // respecting the maximum and minimum sizes of the heap.
1725 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1726 julong reasonable_max = phys_mem / MaxRAMFraction;
1727
1728 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1729 // Small physical memory, so use a minimum fraction of it for the heap
1730 reasonable_max = phys_mem / MinRAMFraction;
1731 } else {
1732 // Not-small physical memory, so require a heap at least
1733 // as large as MaxHeapSize
1734 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1735 }
1736 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1737 // Limit the heap size to ErgoHeapSizeLimit
1738 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1739 }
1740 if (UseCompressedOops) {
1741 // Limit the heap size to the maximum possible when using compressed oops
1742 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1743
1744 // HeapBaseMinAddress can be greater than default but not less than.
1745 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1746 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1747 // matches compressed oops printing flags
1748 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1749 jio_fprintf(defaultStream::error_stream(),
1750 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1751 " (" UINTX_FORMAT "G) which is greater than value given "
1752 UINTX_FORMAT "\n",
1753 DefaultHeapBaseMinAddress,
1754 DefaultHeapBaseMinAddress/G,
1755 HeapBaseMinAddress);
1756 }
1757 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1758 }
1759 }
1760
1761 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1762 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1763 // but it should be not less than default MaxHeapSize.
1764 max_coop_heap -= HeapBaseMinAddress;
1765 }
1766 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1767 }
1768 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1769
1770 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1771 // An initial heap size was specified on the command line,
1772 // so be sure that the maximum size is consistent. Done
1773 // after call to limit_by_allocatable_memory because that
1774 // method might reduce the allocation size.
1775 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1776 }
1777
1778 if (PrintGCDetails && Verbose) {
1779 // Cannot use gclog_or_tty yet.
1780 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1781 }
1782 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1783 }
1784
1785 // If the minimum or initial heap_size have not been set or requested to be set
1786 // ergonomically, set them accordingly.
1787 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1788 julong reasonable_minimum = (julong)(OldSize + NewSize);
1789
1790 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1791
1792 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1793
1794 if (InitialHeapSize == 0) {
1795 julong reasonable_initial = phys_mem / InitialRAMFraction;
1796
1797 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1798 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1799
1800 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1801
1802 if (PrintGCDetails && Verbose) {
1803 // Cannot use gclog_or_tty yet.
1804 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1805 }
1806 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1807 }
1808 // If the minimum heap size has not been set (via -Xms),
1809 // synchronize with InitialHeapSize to avoid errors with the default value.
1810 if (min_heap_size() == 0) {
1811 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1812 if (PrintGCDetails && Verbose) {
1813 // Cannot use gclog_or_tty yet.
1814 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1815 }
1816 }
1817 }
1818 }
1819
1820 // This must be called after ergonomics because we want bytecode rewriting
1821 // if the server compiler is used, or if UseSharedSpaces is disabled.
1822 void Arguments::set_bytecode_flags() {
1823 // Better not attempt to store into a read-only space.
1824 if (UseSharedSpaces) {
1825 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1826 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1827 }
1828
1829 if (!RewriteBytecodes) {
1830 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1831 }
1832 }
1833
1834 // Aggressive optimization flags -XX:+AggressiveOpts
1835 void Arguments::set_aggressive_opts_flags() {
1836 #ifdef COMPILER2
1837 if (AggressiveUnboxing) {
1838 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1839 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1840 } else if (!EliminateAutoBox) {
1841 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1842 AggressiveUnboxing = false;
1843 }
1844 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1845 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1846 } else if (!DoEscapeAnalysis) {
1847 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1848 AggressiveUnboxing = false;
1849 }
1850 }
1851 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1852 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1853 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1854 }
1855 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1856 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1857 }
1858
1859 // Feed the cache size setting into the JDK
1860 char buffer[1024];
1861 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1862 add_property(buffer);
1863 }
1864 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1865 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1866 }
1867 #endif
1868
1869 if (AggressiveOpts) {
1870 // Sample flag setting code
1871 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1872 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1873 // }
1874 }
1875 }
1876
1877 //===========================================================================================================
1878 // Parsing of java.compiler property
1879
1880 void Arguments::process_java_compiler_argument(char* arg) {
1881 // For backwards compatibility, Djava.compiler=NONE or ""
1882 // causes us to switch to -Xint mode UNLESS -Xdebug
1883 // is also specified.
1884 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1885 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1886 }
1887 }
1888
1889 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1890 _sun_java_launcher = strdup(launcher);
1891 }
1892
1893 bool Arguments::created_by_java_launcher() {
1894 assert(_sun_java_launcher != NULL, "property must have value");
1895 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1896 }
1897
1898 bool Arguments::sun_java_launcher_is_altjvm() {
1899 return _sun_java_launcher_is_altjvm;
1900 }
1901
1902 //===========================================================================================================
1903 // Parsing of main arguments
1904
1905 bool Arguments::verify_interval(uintx val, uintx min,
1906 uintx max, const char* name) {
1907 // Returns true iff value is in the inclusive interval [min..max]
1908 // false, otherwise.
1909 if (val >= min && val <= max) {
1910 return true;
1911 }
1912 jio_fprintf(defaultStream::error_stream(),
1913 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1914 " and " UINTX_FORMAT "\n",
1915 name, val, min, max);
1916 return false;
1917 }
1918
1919 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1920 // Returns true if given value is at least specified min threshold
1921 // false, otherwise.
1922 if (val >= min ) {
1923 return true;
1924 }
1925 jio_fprintf(defaultStream::error_stream(),
1926 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1927 name, val, min);
1928 return false;
1929 }
1930
1931 bool Arguments::verify_percentage(uintx value, const char* name) {
1932 if (is_percentage(value)) {
1933 return true;
1934 }
1935 jio_fprintf(defaultStream::error_stream(),
1936 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1937 name, value);
1938 return false;
1939 }
1940
1941 #if !INCLUDE_ALL_GCS
1942 #ifdef ASSERT
1943 static bool verify_serial_gc_flags() {
1944 return (UseSerialGC &&
1945 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1946 UseParallelGC || UseParallelOldGC));
1947 }
1948 #endif // ASSERT
1949 #endif // INCLUDE_ALL_GCS
1950
1951 // check if do gclog rotation
1952 // +UseGCLogFileRotation is a must,
1953 // no gc log rotation when log file not supplied or
1954 // NumberOfGCLogFiles is 0
1955 void check_gclog_consistency() {
1956 if (UseGCLogFileRotation) {
1957 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1958 jio_fprintf(defaultStream::output_stream(),
1959 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1960 "where num_of_file > 0\n"
1961 "GC log rotation is turned off\n");
1962 UseGCLogFileRotation = false;
1963 }
1964 }
1965
1966 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1967 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1968 jio_fprintf(defaultStream::output_stream(),
1969 "GCLogFileSize changed to minimum 8K\n");
1970 }
1971 }
1972
1973 // This function is called for -Xloggc:<filename>, it can be used
1974 // to check if a given file name(or string) conforms to the following
1975 // specification:
1976 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1977 // %p and %t only allowed once. We only limit usage of filename not path
1978 bool is_filename_valid(const char *file_name) {
1979 const char* p = file_name;
1980 char file_sep = os::file_separator()[0];
1981 const char* cp;
1982 // skip prefix path
1983 for (cp = file_name; *cp != '\0'; cp++) {
1984 if (*cp == '/' || *cp == file_sep) {
1985 p = cp + 1;
1986 }
1987 }
1988
1989 int count_p = 0;
1990 int count_t = 0;
1991 while (*p != '\0') {
1992 if ((*p >= '0' && *p <= '9') ||
1993 (*p >= 'A' && *p <= 'Z') ||
1994 (*p >= 'a' && *p <= 'z') ||
1995 *p == '-' ||
1996 *p == '_' ||
1997 *p == '.') {
1998 p++;
1999 continue;
2000 }
2001 if (*p == '%') {
2002 if(*(p + 1) == 'p') {
2003 p += 2;
2004 count_p ++;
2005 continue;
2006 }
2007 if (*(p + 1) == 't') {
2008 p += 2;
2009 count_t ++;
2010 continue;
2011 }
2012 }
2013 return false;
2014 }
2015 return count_p < 2 && count_t < 2;
2016 }
2017
2018 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2019 if (!is_percentage(min_heap_free_ratio)) {
2020 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2021 return false;
2022 }
2023 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2024 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2025 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2026 MaxHeapFreeRatio);
2027 return false;
2028 }
2029 return true;
2030 }
2031
2032 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2033 if (!is_percentage(max_heap_free_ratio)) {
2034 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2035 return false;
2036 }
2037 if (max_heap_free_ratio < MinHeapFreeRatio) {
2038 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2039 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2040 MinHeapFreeRatio);
2041 return false;
2042 }
2043 return true;
2044 }
2045
2046 // Check consistency of GC selection
2047 bool Arguments::check_gc_consistency() {
2048 check_gclog_consistency();
2049 bool status = true;
2050 // Ensure that the user has not selected conflicting sets
2051 // of collectors. [Note: this check is merely a user convenience;
2052 // collectors over-ride each other so that only a non-conflicting
2053 // set is selected; however what the user gets is not what they
2054 // may have expected from the combination they asked for. It's
2055 // better to reduce user confusion by not allowing them to
2056 // select conflicting combinations.
2057 uint i = 0;
2058 if (UseSerialGC) i++;
2059 if (UseConcMarkSweepGC || UseParNewGC) i++;
2060 if (UseParallelGC || UseParallelOldGC) i++;
2061 if (UseG1GC) i++;
2062 if (i > 1) {
2063 jio_fprintf(defaultStream::error_stream(),
2064 "Conflicting collector combinations in option list; "
2065 "please refer to the release notes for the combinations "
2066 "allowed\n");
2067 status = false;
2068 }
2069 return status;
2070 }
2071
2072 void Arguments::check_deprecated_gcs() {
2073 if (UseConcMarkSweepGC && !UseParNewGC) {
2074 warning("Using the DefNew young collector with the CMS collector is deprecated "
2075 "and will likely be removed in a future release");
2076 }
2077
2078 if (UseParNewGC && !UseConcMarkSweepGC) {
2079 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2080 // set up UseSerialGC properly, so that can't be used in the check here.
2081 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2082 "and will likely be removed in a future release");
2083 }
2084
2085 if (CMSIncrementalMode) {
2086 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2087 }
2088 }
2089
2090 void Arguments::check_deprecated_gc_flags() {
2091 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2092 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2093 "and will likely be removed in future release");
2094 }
2095 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2096 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2097 "Use MaxRAMFraction instead.");
2098 }
2099 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2100 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2101 }
2102 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2103 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2104 }
2105 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2106 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2107 }
2108 }
2109
2110 // Check stack pages settings
2111 bool Arguments::check_stack_pages()
2112 {
2113 bool status = true;
2114 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2115 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2116 // greater stack shadow pages can't generate instruction to bang stack
2117 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2118 return status;
2119 }
2120
2121 // Check the consistency of vm_init_args
2122 bool Arguments::check_vm_args_consistency() {
2123 // Method for adding checks for flag consistency.
2124 // The intent is to warn the user of all possible conflicts,
2125 // before returning an error.
2126 // Note: Needs platform-dependent factoring.
2127 bool status = true;
2128
2129 if (TLABRefillWasteFraction == 0) {
2130 jio_fprintf(defaultStream::error_stream(),
2131 "TLABRefillWasteFraction should be a denominator, "
2132 "not " SIZE_FORMAT "\n",
2133 TLABRefillWasteFraction);
2134 status = false;
2135 }
2136
2137 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2138 "AdaptiveSizePolicyWeight");
2139 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2140
2141 // Divide by bucket size to prevent a large size from causing rollover when
2142 // calculating amount of memory needed to be allocated for the String table.
2143 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2144 (max_uintx / StringTable::bucket_size()), "StringTable size");
2145
2146 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2147 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2148
2149 {
2150 // Using "else if" below to avoid printing two error messages if min > max.
2151 // This will also prevent us from reporting both min>100 and max>100 at the
2152 // same time, but that is less annoying than printing two identical errors IMHO.
2153 FormatBuffer<80> err_msg("%s","");
2154 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2155 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2156 status = false;
2157 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2158 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2159 status = false;
2160 }
2161 }
2162
2163 // Min/MaxMetaspaceFreeRatio
2164 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2165 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2166
2167 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2168 jio_fprintf(defaultStream::error_stream(),
2169 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2170 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2171 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2172 MinMetaspaceFreeRatio,
2173 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2174 MaxMetaspaceFreeRatio);
2175 status = false;
2176 }
2177
2178 // Trying to keep 100% free is not practical
2179 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2180
2181 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2182 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2183 }
2184
2185 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2186 // Settings to encourage splitting.
2187 if (!FLAG_IS_CMDLINE(NewRatio)) {
2188 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2189 }
2190 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2191 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2192 }
2193 }
2194
2195 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2196 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2197 }
2198
2199 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2200 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2201 if (GCTimeLimit == 100) {
2202 // Turn off gc-overhead-limit-exceeded checks
2203 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2204 }
2205
2206 status = status && check_gc_consistency();
2207 status = status && check_stack_pages();
2208
2209 if (CMSIncrementalMode) {
2210 if (!UseConcMarkSweepGC) {
2211 jio_fprintf(defaultStream::error_stream(),
2212 "error: invalid argument combination.\n"
2213 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2214 "selected in order\nto use CMSIncrementalMode.\n");
2215 status = false;
2216 } else {
2217 status = status && verify_percentage(CMSIncrementalDutyCycle,
2218 "CMSIncrementalDutyCycle");
2219 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2220 "CMSIncrementalDutyCycleMin");
2221 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2222 "CMSIncrementalSafetyFactor");
2223 status = status && verify_percentage(CMSIncrementalOffset,
2224 "CMSIncrementalOffset");
2225 status = status && verify_percentage(CMSExpAvgFactor,
2226 "CMSExpAvgFactor");
2227 // If it was not set on the command line, set
2228 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2229 if (CMSInitiatingOccupancyFraction < 0) {
2230 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2231 }
2232 }
2233 }
2234
2235 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2236 // insists that we hold the requisite locks so that the iteration is
2237 // MT-safe. For the verification at start-up and shut-down, we don't
2238 // yet have a good way of acquiring and releasing these locks,
2239 // which are not visible at the CollectedHeap level. We want to
2240 // be able to acquire these locks and then do the iteration rather
2241 // than just disable the lock verification. This will be fixed under
2242 // bug 4788986.
2243 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2244 if (VerifyDuringStartup) {
2245 warning("Heap verification at start-up disabled "
2246 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2247 VerifyDuringStartup = false; // Disable verification at start-up
2248 }
2249
2250 if (VerifyBeforeExit) {
2251 warning("Heap verification at shutdown disabled "
2252 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2253 VerifyBeforeExit = false; // Disable verification at shutdown
2254 }
2255 }
2256
2257 // Note: only executed in non-PRODUCT mode
2258 if (!UseAsyncConcMarkSweepGC &&
2259 (ExplicitGCInvokesConcurrent ||
2260 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2261 jio_fprintf(defaultStream::error_stream(),
2262 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2263 " with -UseAsyncConcMarkSweepGC");
2264 status = false;
2265 }
2266
2267 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2268
2269 #if INCLUDE_ALL_GCS
2270 if (UseG1GC) {
2271 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2272 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2273 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2274
2275 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2276 "InitiatingHeapOccupancyPercent");
2277 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2278 "G1RefProcDrainInterval");
2279 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2280 "G1ConcMarkStepDurationMillis");
2281 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2282 "G1ConcRSHotCardLimit");
2283 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2284 "G1ConcRSLogCacheSize");
2285 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2286 "StringDeduplicationAgeThreshold");
2287 }
2288 if (UseConcMarkSweepGC) {
2289 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2290 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2291 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2292 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2293
2294 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2295
2296 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2297 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2298 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2299
2300 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2301
2302 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2303 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2304
2305 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2306 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2307 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2308
2309 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2310
2311 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2312
2313 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2314 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2315 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2316 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2317 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2318 }
2319
2320 if (UseParallelGC || UseParallelOldGC) {
2321 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2322 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2323
2324 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2325 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2326
2327 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2328 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2329
2330 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2331
2332 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2333 }
2334 #endif // INCLUDE_ALL_GCS
2335
2336 status = status && verify_interval(RefDiscoveryPolicy,
2337 ReferenceProcessor::DiscoveryPolicyMin,
2338 ReferenceProcessor::DiscoveryPolicyMax,
2339 "RefDiscoveryPolicy");
2340
2341 // Limit the lower bound of this flag to 1 as it is used in a division
2342 // expression.
2343 status = status && verify_interval(TLABWasteTargetPercent,
2344 1, 100, "TLABWasteTargetPercent");
2345
2346 status = status && verify_object_alignment();
2347
2348 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2349 "CompressedClassSpaceSize");
2350
2351 status = status && verify_interval(MarkStackSizeMax,
2352 1, (max_jint - 1), "MarkStackSizeMax");
2353 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2354
2355 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2356
2357 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2358
2359 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2360
2361 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2362 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2363
2364 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2365
2366 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2367 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2368 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2369 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2370
2371 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2372 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2373
2374 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2375 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2376 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2377
2378 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2379 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2380
2381 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2382 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2383 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2384 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2385
2386 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2387 #ifdef COMPILER1
2388 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2389 #endif
2390
2391 if (PrintNMTStatistics) {
2392 #if INCLUDE_NMT
2393 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2394 #endif // INCLUDE_NMT
2395 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2396 PrintNMTStatistics = false;
2397 #if INCLUDE_NMT
2398 }
2399 #endif
2400 }
2401
2402 // Need to limit the extent of the padding to reasonable size.
2403 // 8K is well beyond the reasonable HW cache line size, even with the
2404 // aggressive prefetching, while still leaving the room for segregating
2405 // among the distinct pages.
2406 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2407 jio_fprintf(defaultStream::error_stream(),
2408 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2409 ContendedPaddingWidth, 0, 8192);
2410 status = false;
2411 }
2412
2413 // Need to enforce the padding not to break the existing field alignments.
2414 // It is sufficient to check against the largest type size.
2415 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2416 jio_fprintf(defaultStream::error_stream(),
2417 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2418 ContendedPaddingWidth, BytesPerLong);
2419 status = false;
2420 }
2421
2422 // Check lower bounds of the code cache
2423 // Template Interpreter code is approximately 3X larger in debug builds.
2424 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2425 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2426 jio_fprintf(defaultStream::error_stream(),
2427 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2428 os::vm_page_size()/K);
2429 status = false;
2430 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2431 jio_fprintf(defaultStream::error_stream(),
2432 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2433 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2434 status = false;
2435 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2438 min_code_cache_size/K);
2439 status = false;
2440 } else if (ReservedCodeCacheSize > 2*G) {
2441 // Code cache size larger than MAXINT is not supported.
2442 jio_fprintf(defaultStream::error_stream(),
2443 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2444 (2*G)/M);
2445 status = false;
2446 }
2447
2448 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2449 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2450 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2451 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2452
2453 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2454 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2455 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2456 // Check the minimum number of compiler threads
2457 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2458
2459 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2460 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2461 }
2462
2463 status &= check_vm_args_consistency_ext();
2464
2465 return status;
2466 }
2467
2468 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2469 const char* option_type) {
2470 if (ignore) return false;
2471
2472 const char* spacer = " ";
2473 if (option_type == NULL) {
2474 option_type = ++spacer; // Set both to the empty string.
2475 }
2476
2477 if (os::obsolete_option(option)) {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "Obsolete %s%soption: %s\n", option_type, spacer,
2480 option->optionString);
2481 return false;
2482 } else {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Unrecognized %s%soption: %s\n", option_type, spacer,
2485 option->optionString);
2486 return true;
2487 }
2488 }
2489
2490 static const char* user_assertion_options[] = {
2491 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2492 };
2493
2494 static const char* system_assertion_options[] = {
2495 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2496 };
2497
2498 // Return true if any of the strings in null-terminated array 'names' matches.
2499 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2500 // the option must match exactly.
2501 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2502 bool tail_allowed) {
2503 for (/* empty */; *names != NULL; ++names) {
2504 if (match_option(option, *names, tail)) {
2505 if (**tail == '\0' || tail_allowed && **tail == ':') {
2506 return true;
2507 }
2508 }
2509 }
2510 return false;
2511 }
2512
2513 bool Arguments::parse_uintx(const char* value,
2514 uintx* uintx_arg,
2515 uintx min_size) {
2516
2517 // Check the sign first since atomull() parses only unsigned values.
2518 bool value_is_positive = !(*value == '-');
2519
2520 if (value_is_positive) {
2521 julong n;
2522 bool good_return = atomull(value, &n);
2523 if (good_return) {
2524 bool above_minimum = n >= min_size;
2525 bool value_is_too_large = n > max_uintx;
2526
2527 if (above_minimum && !value_is_too_large) {
2528 *uintx_arg = n;
2529 return true;
2530 }
2531 }
2532 }
2533 return false;
2534 }
2535
2536 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2537 julong* long_arg,
2538 julong min_size) {
2539 if (!atomull(s, long_arg)) return arg_unreadable;
2540 return check_memory_size(*long_arg, min_size);
2541 }
2542
2543 // Parse JavaVMInitArgs structure
2544
2545 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2546 // For components of the system classpath.
2547 SysClassPath scp(Arguments::get_sysclasspath());
2548 bool scp_assembly_required = false;
2549
2550 // Save default settings for some mode flags
2551 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2552 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2553 Arguments::_ClipInlining = ClipInlining;
2554 Arguments::_BackgroundCompilation = BackgroundCompilation;
2555
2556 // Setup flags for mixed which is the default
2557 set_mode_flags(_mixed);
2558
2559 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2560 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2561 if (result != JNI_OK) {
2562 return result;
2563 }
2564
2565 // Parse JavaVMInitArgs structure passed in
2566 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2567 if (result != JNI_OK) {
2568 return result;
2569 }
2570
2571 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2572 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2573 if (result != JNI_OK) {
2574 return result;
2575 }
2576
2577 // Do final processing now that all arguments have been parsed
2578 result = finalize_vm_init_args(&scp, scp_assembly_required);
2579 if (result != JNI_OK) {
2580 return result;
2581 }
2582
2583 return JNI_OK;
2584 }
2585
2586 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2587 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2588 // are dealing with -agentpath (case where name is a path), otherwise with
2589 // -agentlib
2590 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2591 char *_name;
2592 const char *_hprof = "hprof", *_jdwp = "jdwp";
2593 size_t _len_hprof, _len_jdwp, _len_prefix;
2594
2595 if (is_path) {
2596 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2597 return false;
2598 }
2599
2600 _name++; // skip past last path separator
2601 _len_prefix = strlen(JNI_LIB_PREFIX);
2602
2603 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2604 return false;
2605 }
2606
2607 _name += _len_prefix;
2608 _len_hprof = strlen(_hprof);
2609 _len_jdwp = strlen(_jdwp);
2610
2611 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2612 _name += _len_hprof;
2613 }
2614 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2615 _name += _len_jdwp;
2616 }
2617 else {
2618 return false;
2619 }
2620
2621 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2622 return false;
2623 }
2624
2625 return true;
2626 }
2627
2628 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2629 return true;
2630 }
2631
2632 return false;
2633 }
2634
2635 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2636 SysClassPath* scp_p,
2637 bool* scp_assembly_required_p,
2638 Flag::Flags origin) {
2639 // Remaining part of option string
2640 const char* tail;
2641
2642 // iterate over arguments
2643 for (int index = 0; index < args->nOptions; index++) {
2644 bool is_absolute_path = false; // for -agentpath vs -agentlib
2645
2646 const JavaVMOption* option = args->options + index;
2647
2648 if (!match_option(option, "-Djava.class.path", &tail) &&
2649 !match_option(option, "-Dsun.java.command", &tail) &&
2650 !match_option(option, "-Dsun.java.launcher", &tail)) {
2651
2652 // add all jvm options to the jvm_args string. This string
2653 // is used later to set the java.vm.args PerfData string constant.
2654 // the -Djava.class.path and the -Dsun.java.command options are
2655 // omitted from jvm_args string as each have their own PerfData
2656 // string constant object.
2657 build_jvm_args(option->optionString);
2658 }
2659
2660 // -verbose:[class/gc/jni]
2661 if (match_option(option, "-verbose", &tail)) {
2662 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2663 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2664 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2665 } else if (!strcmp(tail, ":gc")) {
2666 FLAG_SET_CMDLINE(bool, PrintGC, true);
2667 } else if (!strcmp(tail, ":jni")) {
2668 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2669 }
2670 // -da / -ea / -disableassertions / -enableassertions
2671 // These accept an optional class/package name separated by a colon, e.g.,
2672 // -da:java.lang.Thread.
2673 } else if (match_option(option, user_assertion_options, &tail, true)) {
2674 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2675 if (*tail == '\0') {
2676 JavaAssertions::setUserClassDefault(enable);
2677 } else {
2678 assert(*tail == ':', "bogus match by match_option()");
2679 JavaAssertions::addOption(tail + 1, enable);
2680 }
2681 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2682 } else if (match_option(option, system_assertion_options, &tail, false)) {
2683 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2684 JavaAssertions::setSystemClassDefault(enable);
2685 // -bootclasspath:
2686 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2687 scp_p->reset_path(tail);
2688 *scp_assembly_required_p = true;
2689 // -bootclasspath/a:
2690 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2691 scp_p->add_suffix(tail);
2692 *scp_assembly_required_p = true;
2693 // -bootclasspath/p:
2694 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2695 scp_p->add_prefix(tail);
2696 *scp_assembly_required_p = true;
2697 // -Xrun
2698 } else if (match_option(option, "-Xrun", &tail)) {
2699 if (tail != NULL) {
2700 const char* pos = strchr(tail, ':');
2701 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2702 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2703 name[len] = '\0';
2704
2705 char *options = NULL;
2706 if(pos != NULL) {
2707 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2708 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2709 }
2710 #if !INCLUDE_JVMTI
2711 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2712 jio_fprintf(defaultStream::error_stream(),
2713 "Profiling and debugging agents are not supported in this VM\n");
2714 return JNI_ERR;
2715 }
2716 #endif // !INCLUDE_JVMTI
2717 add_init_library(name, options);
2718 }
2719 // -agentlib and -agentpath
2720 } else if (match_option(option, "-agentlib:", &tail) ||
2721 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2722 if(tail != NULL) {
2723 const char* pos = strchr(tail, '=');
2724 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2725 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2726 name[len] = '\0';
2727
2728 char *options = NULL;
2729 if(pos != NULL) {
2730 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2731 }
2732 #if !INCLUDE_JVMTI
2733 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2734 jio_fprintf(defaultStream::error_stream(),
2735 "Profiling and debugging agents are not supported in this VM\n");
2736 return JNI_ERR;
2737 }
2738 #endif // !INCLUDE_JVMTI
2739 add_init_agent(name, options, is_absolute_path);
2740 }
2741 // -javaagent
2742 } else if (match_option(option, "-javaagent:", &tail)) {
2743 #if !INCLUDE_JVMTI
2744 jio_fprintf(defaultStream::error_stream(),
2745 "Instrumentation agents are not supported in this VM\n");
2746 return JNI_ERR;
2747 #else
2748 if(tail != NULL) {
2749 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2750 add_init_agent("instrument", options, false);
2751 }
2752 #endif // !INCLUDE_JVMTI
2753 // -Xnoclassgc
2754 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2755 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2756 // -Xincgc: i-CMS
2757 } else if (match_option(option, "-Xincgc", &tail)) {
2758 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2759 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2760 // -Xnoincgc: no i-CMS
2761 } else if (match_option(option, "-Xnoincgc", &tail)) {
2762 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2763 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2764 // -Xconcgc
2765 } else if (match_option(option, "-Xconcgc", &tail)) {
2766 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2767 // -Xnoconcgc
2768 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2769 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2770 // -Xbatch
2771 } else if (match_option(option, "-Xbatch", &tail)) {
2772 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2773 // -Xmn for compatibility with other JVM vendors
2774 } else if (match_option(option, "-Xmn", &tail)) {
2775 julong long_initial_young_size = 0;
2776 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2777 if (errcode != arg_in_range) {
2778 jio_fprintf(defaultStream::error_stream(),
2779 "Invalid initial young generation size: %s\n", option->optionString);
2780 describe_range_error(errcode);
2781 return JNI_EINVAL;
2782 }
2783 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2784 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2785 // -Xms
2786 } else if (match_option(option, "-Xms", &tail)) {
2787 julong long_initial_heap_size = 0;
2788 // an initial heap size of 0 means automatically determine
2789 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2790 if (errcode != arg_in_range) {
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Invalid initial heap size: %s\n", option->optionString);
2793 describe_range_error(errcode);
2794 return JNI_EINVAL;
2795 }
2796 set_min_heap_size((uintx)long_initial_heap_size);
2797 // Currently the minimum size and the initial heap sizes are the same.
2798 // Can be overridden with -XX:InitialHeapSize.
2799 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2800 // -Xmx
2801 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2802 julong long_max_heap_size = 0;
2803 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2804 if (errcode != arg_in_range) {
2805 jio_fprintf(defaultStream::error_stream(),
2806 "Invalid maximum heap size: %s\n", option->optionString);
2807 describe_range_error(errcode);
2808 return JNI_EINVAL;
2809 }
2810 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2811 // Xmaxf
2812 } else if (match_option(option, "-Xmaxf", &tail)) {
2813 char* err;
2814 int maxf = (int)(strtod(tail, &err) * 100);
2815 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2816 jio_fprintf(defaultStream::error_stream(),
2817 "Bad max heap free percentage size: %s\n",
2818 option->optionString);
2819 return JNI_EINVAL;
2820 } else {
2821 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2822 }
2823 // Xminf
2824 } else if (match_option(option, "-Xminf", &tail)) {
2825 char* err;
2826 int minf = (int)(strtod(tail, &err) * 100);
2827 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Bad min heap free percentage size: %s\n",
2830 option->optionString);
2831 return JNI_EINVAL;
2832 } else {
2833 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2834 }
2835 // -Xss
2836 } else if (match_option(option, "-Xss", &tail)) {
2837 julong long_ThreadStackSize = 0;
2838 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2839 if (errcode != arg_in_range) {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "Invalid thread stack size: %s\n", option->optionString);
2842 describe_range_error(errcode);
2843 return JNI_EINVAL;
2844 }
2845 // Internally track ThreadStackSize in units of 1024 bytes.
2846 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2847 round_to((int)long_ThreadStackSize, K) / K);
2848 // -Xoss
2849 } else if (match_option(option, "-Xoss", &tail)) {
2850 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2851 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2852 julong long_CodeCacheExpansionSize = 0;
2853 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2854 if (errcode != arg_in_range) {
2855 jio_fprintf(defaultStream::error_stream(),
2856 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2857 os::vm_page_size()/K);
2858 return JNI_EINVAL;
2859 }
2860 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2861 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2862 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2863 julong long_ReservedCodeCacheSize = 0;
2864
2865 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2866 if (errcode != arg_in_range) {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Invalid maximum code cache size: %s.\n", option->optionString);
2869 return JNI_EINVAL;
2870 }
2871 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2872 //-XX:IncreaseFirstTierCompileThresholdAt=
2873 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2874 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2875 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2876 jio_fprintf(defaultStream::error_stream(),
2877 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2878 option->optionString);
2879 return JNI_EINVAL;
2880 }
2881 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2882 // -green
2883 } else if (match_option(option, "-green", &tail)) {
2884 jio_fprintf(defaultStream::error_stream(),
2885 "Green threads support not available\n");
2886 return JNI_EINVAL;
2887 // -native
2888 } else if (match_option(option, "-native", &tail)) {
2889 // HotSpot always uses native threads, ignore silently for compatibility
2890 // -Xsqnopause
2891 } else if (match_option(option, "-Xsqnopause", &tail)) {
2892 // EVM option, ignore silently for compatibility
2893 // -Xrs
2894 } else if (match_option(option, "-Xrs", &tail)) {
2895 // Classic/EVM option, new functionality
2896 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2897 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2898 // change default internal VM signals used - lower case for back compat
2899 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2900 // -Xoptimize
2901 } else if (match_option(option, "-Xoptimize", &tail)) {
2902 // EVM option, ignore silently for compatibility
2903 // -Xprof
2904 } else if (match_option(option, "-Xprof", &tail)) {
2905 #if INCLUDE_FPROF
2906 _has_profile = true;
2907 #else // INCLUDE_FPROF
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Flat profiling is not supported in this VM.\n");
2910 return JNI_ERR;
2911 #endif // INCLUDE_FPROF
2912 // -Xconcurrentio
2913 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2914 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2915 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2916 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2917 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2918 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2919
2920 // -Xinternalversion
2921 } else if (match_option(option, "-Xinternalversion", &tail)) {
2922 jio_fprintf(defaultStream::output_stream(), "%s\n",
2923 VM_Version::internal_vm_info_string());
2924 vm_exit(0);
2925 #ifndef PRODUCT
2926 // -Xprintflags
2927 } else if (match_option(option, "-Xprintflags", &tail)) {
2928 CommandLineFlags::printFlags(tty, false);
2929 vm_exit(0);
2930 #endif
2931 // -D
2932 } else if (match_option(option, "-D", &tail)) {
2933 if (!add_property(tail)) {
2934 return JNI_ENOMEM;
2935 }
2936 // Out of the box management support
2937 if (match_option(option, "-Dcom.sun.management", &tail)) {
2938 #if INCLUDE_MANAGEMENT
2939 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2940 #else
2941 jio_fprintf(defaultStream::output_stream(),
2942 "-Dcom.sun.management is not supported in this VM.\n");
2943 return JNI_ERR;
2944 #endif
2945 }
2946 // -Xint
2947 } else if (match_option(option, "-Xint", &tail)) {
2948 set_mode_flags(_int);
2949 // -Xmixed
2950 } else if (match_option(option, "-Xmixed", &tail)) {
2951 set_mode_flags(_mixed);
2952 // -Xcomp
2953 } else if (match_option(option, "-Xcomp", &tail)) {
2954 // for testing the compiler; turn off all flags that inhibit compilation
2955 set_mode_flags(_comp);
2956 // -Xshare:dump
2957 } else if (match_option(option, "-Xshare:dump", &tail)) {
2958 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2959 set_mode_flags(_int); // Prevent compilation, which creates objects
2960 // -Xshare:on
2961 } else if (match_option(option, "-Xshare:on", &tail)) {
2962 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2963 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2964 // -Xshare:auto
2965 } else if (match_option(option, "-Xshare:auto", &tail)) {
2966 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2967 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2968 // -Xshare:off
2969 } else if (match_option(option, "-Xshare:off", &tail)) {
2970 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2971 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2972 // -Xverify
2973 } else if (match_option(option, "-Xverify", &tail)) {
2974 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2975 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2976 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2977 } else if (strcmp(tail, ":remote") == 0) {
2978 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2979 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2980 } else if (strcmp(tail, ":none") == 0) {
2981 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2982 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2983 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2984 return JNI_EINVAL;
2985 }
2986 // -Xdebug
2987 } else if (match_option(option, "-Xdebug", &tail)) {
2988 // note this flag has been used, then ignore
2989 set_xdebug_mode(true);
2990 // -Xnoagent
2991 } else if (match_option(option, "-Xnoagent", &tail)) {
2992 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2993 } else if (match_option(option, "-Xboundthreads", &tail)) {
2994 // Bind user level threads to kernel threads (Solaris only)
2995 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2996 } else if (match_option(option, "-Xloggc:", &tail)) {
2997 // Redirect GC output to the file. -Xloggc:<filename>
2998 // ostream_init_log(), when called will use this filename
2999 // to initialize a fileStream.
3000 _gc_log_filename = strdup(tail);
3001 if (!is_filename_valid(_gc_log_filename)) {
3002 jio_fprintf(defaultStream::output_stream(),
3003 "Invalid file name for use with -Xloggc: Filename can only contain the "
3004 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3005 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3006 return JNI_EINVAL;
3007 }
3008 FLAG_SET_CMDLINE(bool, PrintGC, true);
3009 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3010
3011 // JNI hooks
3012 } else if (match_option(option, "-Xcheck", &tail)) {
3013 if (!strcmp(tail, ":jni")) {
3014 #if !INCLUDE_JNI_CHECK
3015 warning("JNI CHECKING is not supported in this VM");
3016 #else
3017 CheckJNICalls = true;
3018 #endif // INCLUDE_JNI_CHECK
3019 } else if (is_bad_option(option, args->ignoreUnrecognized,
3020 "check")) {
3021 return JNI_EINVAL;
3022 }
3023 } else if (match_option(option, "vfprintf", &tail)) {
3024 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3025 } else if (match_option(option, "exit", &tail)) {
3026 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3027 } else if (match_option(option, "abort", &tail)) {
3028 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3029 // -XX:+AggressiveHeap
3030 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3031
3032 // This option inspects the machine and attempts to set various
3033 // parameters to be optimal for long-running, memory allocation
3034 // intensive jobs. It is intended for machines with large
3035 // amounts of cpu and memory.
3036
3037 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3038 // VM, but we may not be able to represent the total physical memory
3039 // available (like having 8gb of memory on a box but using a 32bit VM).
3040 // Thus, we need to make sure we're using a julong for intermediate
3041 // calculations.
3042 julong initHeapSize;
3043 julong total_memory = os::physical_memory();
3044
3045 if (total_memory < (julong)256*M) {
3046 jio_fprintf(defaultStream::error_stream(),
3047 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3048 vm_exit(1);
3049 }
3050
3051 // The heap size is half of available memory, or (at most)
3052 // all of possible memory less 160mb (leaving room for the OS
3053 // when using ISM). This is the maximum; because adaptive sizing
3054 // is turned on below, the actual space used may be smaller.
3055
3056 initHeapSize = MIN2(total_memory / (julong)2,
3057 total_memory - (julong)160*M);
3058
3059 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3060
3061 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3062 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3063 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3064 // Currently the minimum size and the initial heap sizes are the same.
3065 set_min_heap_size(initHeapSize);
3066 }
3067 if (FLAG_IS_DEFAULT(NewSize)) {
3068 // Make the young generation 3/8ths of the total heap.
3069 FLAG_SET_CMDLINE(uintx, NewSize,
3070 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3071 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3072 }
3073
3074 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3075 FLAG_SET_DEFAULT(UseLargePages, true);
3076 #endif
3077
3078 // Increase some data structure sizes for efficiency
3079 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3080 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3081 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3082
3083 // See the OldPLABSize comment below, but replace 'after promotion'
3084 // with 'after copying'. YoungPLABSize is the size of the survivor
3085 // space per-gc-thread buffers. The default is 4kw.
3086 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3087
3088 // OldPLABSize is the size of the buffers in the old gen that
3089 // UseParallelGC uses to promote live data that doesn't fit in the
3090 // survivor spaces. At any given time, there's one for each gc thread.
3091 // The default size is 1kw. These buffers are rarely used, since the
3092 // survivor spaces are usually big enough. For specjbb, however, there
3093 // are occasions when there's lots of live data in the young gen
3094 // and we end up promoting some of it. We don't have a definite
3095 // explanation for why bumping OldPLABSize helps, but the theory
3096 // is that a bigger PLAB results in retaining something like the
3097 // original allocation order after promotion, which improves mutator
3098 // locality. A minor effect may be that larger PLABs reduce the
3099 // number of PLAB allocation events during gc. The value of 8kw
3100 // was arrived at by experimenting with specjbb.
3101 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3102
3103 // Enable parallel GC and adaptive generation sizing
3104 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3105 FLAG_SET_DEFAULT(ParallelGCThreads,
3106 Abstract_VM_Version::parallel_worker_threads());
3107
3108 // Encourage steady state memory management
3109 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3110
3111 // This appears to improve mutator locality
3112 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3113
3114 // Get around early Solaris scheduling bug
3115 // (affinity vs other jobs on system)
3116 // but disallow DR and offlining (5008695).
3117 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3118
3119 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3120 // and the last option wins.
3121 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3122 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3123 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3124 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3125 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3126 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3127 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3128 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3129 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3130 uintx max_tenuring_thresh = 0;
3131 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3132 jio_fprintf(defaultStream::error_stream(),
3133 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3134 }
3135 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3136
3137 if (MaxTenuringThreshold == 0) {
3138 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3139 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3140 } else {
3141 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3142 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3143 }
3144 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3145 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3146 jio_fprintf(defaultStream::error_stream(),
3147 "Please use CMSClassUnloadingEnabled in place of "
3148 "CMSPermGenSweepingEnabled in the future\n");
3149 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3150 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3151 jio_fprintf(defaultStream::error_stream(),
3152 "Please use -XX:+UseGCOverheadLimit in place of "
3153 "-XX:+UseGCTimeLimit in the future\n");
3154 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3155 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3156 jio_fprintf(defaultStream::error_stream(),
3157 "Please use -XX:-UseGCOverheadLimit in place of "
3158 "-XX:-UseGCTimeLimit in the future\n");
3159 // The TLE options are for compatibility with 1.3 and will be
3160 // removed without notice in a future release. These options
3161 // are not to be documented.
3162 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3163 // No longer used.
3164 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3165 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3166 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3167 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3168 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3169 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3170 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3171 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3172 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3173 // No longer used.
3174 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3175 julong long_tlab_size = 0;
3176 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3177 if (errcode != arg_in_range) {
3178 jio_fprintf(defaultStream::error_stream(),
3179 "Invalid TLAB size: %s\n", option->optionString);
3180 describe_range_error(errcode);
3181 return JNI_EINVAL;
3182 }
3183 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3184 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3185 // No longer used.
3186 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3187 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3188 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3189 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3190 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3191 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3192 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3193 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3194 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3195 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3196 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3197 #if defined(DTRACE_ENABLED)
3198 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3199 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3200 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3201 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3202 #else // defined(DTRACE_ENABLED)
3203 jio_fprintf(defaultStream::error_stream(),
3204 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3205 return JNI_EINVAL;
3206 #endif // defined(DTRACE_ENABLED)
3207 #ifdef ASSERT
3208 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3209 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3210 // disable scavenge before parallel mark-compact
3211 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3212 #endif
3213 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3214 julong cms_blocks_to_claim = (julong)atol(tail);
3215 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3216 jio_fprintf(defaultStream::error_stream(),
3217 "Please use -XX:OldPLABSize in place of "
3218 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3219 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3220 julong cms_blocks_to_claim = (julong)atol(tail);
3221 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Please use -XX:OldPLABSize in place of "
3224 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3225 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3226 julong old_plab_size = 0;
3227 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3228 if (errcode != arg_in_range) {
3229 jio_fprintf(defaultStream::error_stream(),
3230 "Invalid old PLAB size: %s\n", option->optionString);
3231 describe_range_error(errcode);
3232 return JNI_EINVAL;
3233 }
3234 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3235 jio_fprintf(defaultStream::error_stream(),
3236 "Please use -XX:OldPLABSize in place of "
3237 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3238 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3239 julong young_plab_size = 0;
3240 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3241 if (errcode != arg_in_range) {
3242 jio_fprintf(defaultStream::error_stream(),
3243 "Invalid young PLAB size: %s\n", option->optionString);
3244 describe_range_error(errcode);
3245 return JNI_EINVAL;
3246 }
3247 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3248 jio_fprintf(defaultStream::error_stream(),
3249 "Please use -XX:YoungPLABSize in place of "
3250 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3251 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3252 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3253 julong stack_size = 0;
3254 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3255 if (errcode != arg_in_range) {
3256 jio_fprintf(defaultStream::error_stream(),
3257 "Invalid mark stack size: %s\n", option->optionString);
3258 describe_range_error(errcode);
3259 return JNI_EINVAL;
3260 }
3261 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3262 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3263 julong max_stack_size = 0;
3264 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3265 if (errcode != arg_in_range) {
3266 jio_fprintf(defaultStream::error_stream(),
3267 "Invalid maximum mark stack size: %s\n",
3268 option->optionString);
3269 describe_range_error(errcode);
3270 return JNI_EINVAL;
3271 }
3272 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3273 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3274 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3275 uintx conc_threads = 0;
3276 if (!parse_uintx(tail, &conc_threads, 1)) {
3277 jio_fprintf(defaultStream::error_stream(),
3278 "Invalid concurrent threads: %s\n", option->optionString);
3279 return JNI_EINVAL;
3280 }
3281 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3282 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3283 julong max_direct_memory_size = 0;
3284 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3285 if (errcode != arg_in_range) {
3286 jio_fprintf(defaultStream::error_stream(),
3287 "Invalid maximum direct memory size: %s\n",
3288 option->optionString);
3289 describe_range_error(errcode);
3290 return JNI_EINVAL;
3291 }
3292 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3293 #if !INCLUDE_MANAGEMENT
3294 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3295 jio_fprintf(defaultStream::error_stream(),
3296 "ManagementServer is not supported in this VM.\n");
3297 return JNI_ERR;
3298 #endif // INCLUDE_MANAGEMENT
3299 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3300 // Skip -XX:Flags= since that case has already been handled
3301 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3302 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3303 return JNI_EINVAL;
3304 }
3305 }
3306 // Unknown option
3307 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3308 return JNI_ERR;
3309 }
3310 }
3311
3312 // PrintSharedArchiveAndExit will turn on
3313 // -Xshare:on
3314 // -XX:+TraceClassPaths
3315 if (PrintSharedArchiveAndExit) {
3316 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3317 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3318 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3319 }
3320
3321 // Change the default value for flags which have different default values
3322 // when working with older JDKs.
3323 #ifdef LINUX
3324 if (JDK_Version::current().compare_major(6) <= 0 &&
3325 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3326 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3327 }
3328 #endif // LINUX
3329 fix_appclasspath();
3330 return JNI_OK;
3331 }
3332
3333 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3334 //
3335 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3336 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3337 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3338 // path is treated as the current directory.
3339 //
3340 // This causes problems with CDS, which requires that all directories specified in the classpath
3341 // must be empty. In most cases, applications do NOT want to load classes from the current
3342 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3343 // scripts compatible with CDS.
3344 void Arguments::fix_appclasspath() {
3345 if (IgnoreEmptyClassPaths) {
3346 const char separator = *os::path_separator();
3347 const char* src = _java_class_path->value();
3348
3349 // skip over all the leading empty paths
3350 while (*src == separator) {
3351 src ++;
3352 }
3353
3354 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3355 strncpy(copy, src, strlen(src) + 1);
3356
3357 // trim all trailing empty paths
3358 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3359 *tail = '\0';
3360 }
3361
3362 char from[3] = {separator, separator, '\0'};
3363 char to [2] = {separator, '\0'};
3364 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3365 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3366 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3367 }
3368
3369 _java_class_path->set_value(copy);
3370 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3371 }
3372
3373 if (!PrintSharedArchiveAndExit) {
3374 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3375 }
3376 }
3377
3378 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3379 // This must be done after all -D arguments have been processed.
3380 scp_p->expand_endorsed();
3381
3382 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3383 // Assemble the bootclasspath elements into the final path.
3384 Arguments::set_sysclasspath(scp_p->combined_path());
3385 }
3386
3387 // This must be done after all arguments have been processed.
3388 // java_compiler() true means set to "NONE" or empty.
3389 if (java_compiler() && !xdebug_mode()) {
3390 // For backwards compatibility, we switch to interpreted mode if
3391 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3392 // not specified.
3393 set_mode_flags(_int);
3394 }
3395 if (CompileThreshold == 0) {
3396 set_mode_flags(_int);
3397 }
3398
3399 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3400 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3401 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3402 }
3403
3404 #ifndef COMPILER2
3405 // Don't degrade server performance for footprint
3406 if (FLAG_IS_DEFAULT(UseLargePages) &&
3407 MaxHeapSize < LargePageHeapSizeThreshold) {
3408 // No need for large granularity pages w/small heaps.
3409 // Note that large pages are enabled/disabled for both the
3410 // Java heap and the code cache.
3411 FLAG_SET_DEFAULT(UseLargePages, false);
3412 }
3413
3414 #else
3415 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3416 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3417 }
3418 #endif
3419
3420 #ifndef TIERED
3421 // Tiered compilation is undefined.
3422 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3423 #endif
3424
3425 // If we are running in a headless jre, force java.awt.headless property
3426 // to be true unless the property has already been set.
3427 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3428 if (os::is_headless_jre()) {
3429 const char* headless = Arguments::get_property("java.awt.headless");
3430 if (headless == NULL) {
3431 char envbuffer[128];
3432 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3433 if (!add_property("java.awt.headless=true")) {
3434 return JNI_ENOMEM;
3435 }
3436 } else {
3437 char buffer[256];
3438 strcpy(buffer, "java.awt.headless=");
3439 strcat(buffer, envbuffer);
3440 if (!add_property(buffer)) {
3441 return JNI_ENOMEM;
3442 }
3443 }
3444 }
3445 }
3446
3447 if (!check_vm_args_consistency()) {
3448 return JNI_ERR;
3449 }
3450
3451 return JNI_OK;
3452 }
3453
3454 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3455 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3456 scp_assembly_required_p);
3457 }
3458
3459 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3460 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3461 scp_assembly_required_p);
3462 }
3463
3464 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3465 const int N_MAX_OPTIONS = 64;
3466 const int OPTION_BUFFER_SIZE = 1024;
3467 char buffer[OPTION_BUFFER_SIZE];
3468
3469 // The variable will be ignored if it exceeds the length of the buffer.
3470 // Don't check this variable if user has special privileges
3471 // (e.g. unix su command).
3472 if (os::getenv(name, buffer, sizeof(buffer)) &&
3473 !os::have_special_privileges()) {
3474 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3475 jio_fprintf(defaultStream::error_stream(),
3476 "Picked up %s: %s\n", name, buffer);
3477 char* rd = buffer; // pointer to the input string (rd)
3478 int i;
3479 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3480 while (isspace(*rd)) rd++; // skip whitespace
3481 if (*rd == 0) break; // we re done when the input string is read completely
3482
3483 // The output, option string, overwrites the input string.
3484 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3485 // input string (rd).
3486 char* wrt = rd;
3487
3488 options[i++].optionString = wrt; // Fill in option
3489 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3490 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3491 int quote = *rd; // matching quote to look for
3492 rd++; // don't copy open quote
3493 while (*rd != quote) { // include everything (even spaces) up until quote
3494 if (*rd == 0) { // string termination means unmatched string
3495 jio_fprintf(defaultStream::error_stream(),
3496 "Unmatched quote in %s\n", name);
3497 return JNI_ERR;
3498 }
3499 *wrt++ = *rd++; // copy to option string
3500 }
3501 rd++; // don't copy close quote
3502 } else {
3503 *wrt++ = *rd++; // copy to option string
3504 }
3505 }
3506 // Need to check if we're done before writing a NULL,
3507 // because the write could be to the byte that rd is pointing to.
3508 if (*rd++ == 0) {
3509 *wrt = 0;
3510 break;
3511 }
3512 *wrt = 0; // Zero terminate option
3513 }
3514 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3515 JavaVMInitArgs vm_args;
3516 vm_args.version = JNI_VERSION_1_2;
3517 vm_args.options = options;
3518 vm_args.nOptions = i;
3519 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3520
3521 if (PrintVMOptions) {
3522 const char* tail;
3523 for (int i = 0; i < vm_args.nOptions; i++) {
3524 const JavaVMOption *option = vm_args.options + i;
3525 if (match_option(option, "-XX:", &tail)) {
3526 logOption(tail);
3527 }
3528 }
3529 }
3530
3531 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3532 }
3533 return JNI_OK;
3534 }
3535
3536 void Arguments::set_shared_spaces_flags() {
3537 if (DumpSharedSpaces) {
3538 if (RequireSharedSpaces) {
3539 warning("cannot dump shared archive while using shared archive");
3540 }
3541 UseSharedSpaces = false;
3542 #ifdef _LP64
3543 if (!UseCompressedOops || !UseCompressedClassPointers) {
3544 vm_exit_during_initialization(
3545 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3546 }
3547 } else {
3548 if (!UseCompressedOops || !UseCompressedClassPointers) {
3549 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3550 }
3551 #endif
3552 }
3553 }
3554
3555 #if !INCLUDE_ALL_GCS
3556 static void force_serial_gc() {
3557 FLAG_SET_DEFAULT(UseSerialGC, true);
3558 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3559 UNSUPPORTED_GC_OPTION(UseG1GC);
3560 UNSUPPORTED_GC_OPTION(UseParallelGC);
3561 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3562 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3563 UNSUPPORTED_GC_OPTION(UseParNewGC);
3564 }
3565 #endif // INCLUDE_ALL_GCS
3566
3567 // Sharing support
3568 // Construct the path to the archive
3569 static char* get_shared_archive_path() {
3570 char *shared_archive_path;
3571 if (SharedArchiveFile == NULL) {
3572 char jvm_path[JVM_MAXPATHLEN];
3573 os::jvm_path(jvm_path, sizeof(jvm_path));
3574 char *end = strrchr(jvm_path, *os::file_separator());
3575 if (end != NULL) *end = '\0';
3576 size_t jvm_path_len = strlen(jvm_path);
3577 size_t file_sep_len = strlen(os::file_separator());
3578 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3579 file_sep_len + 20, mtInternal);
3580 if (shared_archive_path != NULL) {
3581 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3582 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3583 strncat(shared_archive_path, "classes.jsa", 11);
3584 }
3585 } else {
3586 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3587 if (shared_archive_path != NULL) {
3588 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3589 }
3590 }
3591 return shared_archive_path;
3592 }
3593
3594 #ifndef PRODUCT
3595 // Determine whether LogVMOutput should be implicitly turned on.
3596 static bool use_vm_log() {
3597 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3598 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3599 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3600 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3601 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3602 return true;
3603 }
3604
3605 #ifdef COMPILER1
3606 if (PrintC1Statistics) {
3607 return true;
3608 }
3609 #endif // COMPILER1
3610
3611 #ifdef COMPILER2
3612 if (PrintOptoAssembly || PrintOptoStatistics) {
3613 return true;
3614 }
3615 #endif // COMPILER2
3616
3617 return false;
3618 }
3619 #endif // PRODUCT
3620
3621 // Parse entry point called from JNI_CreateJavaVM
3622
3623 jint Arguments::parse(const JavaVMInitArgs* args) {
3624
3625 // Remaining part of option string
3626 const char* tail;
3627
3628 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3629 const char* hotspotrc = ".hotspotrc";
3630 bool settings_file_specified = false;
3631 bool needs_hotspotrc_warning = false;
3632
3633 const char* flags_file;
3634 int index;
3635 for (index = 0; index < args->nOptions; index++) {
3636 const JavaVMOption *option = args->options + index;
3637 if (match_option(option, "-XX:Flags=", &tail)) {
3638 flags_file = tail;
3639 settings_file_specified = true;
3640 }
3641 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3642 PrintVMOptions = true;
3643 }
3644 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3645 PrintVMOptions = false;
3646 }
3647 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3648 IgnoreUnrecognizedVMOptions = true;
3649 }
3650 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3651 IgnoreUnrecognizedVMOptions = false;
3652 }
3653 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3654 CommandLineFlags::printFlags(tty, false);
3655 vm_exit(0);
3656 }
3657 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3658 #if INCLUDE_NMT
3659 MemTracker::init_tracking_options(tail);
3660 #else
3661 jio_fprintf(defaultStream::error_stream(),
3662 "Native Memory Tracking is not supported in this VM\n");
3663 return JNI_ERR;
3664 #endif
3665 }
3666
3667
3668 #ifndef PRODUCT
3669 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3670 CommandLineFlags::printFlags(tty, true);
3671 vm_exit(0);
3672 }
3673 #endif
3674 }
3675
3676 if (IgnoreUnrecognizedVMOptions) {
3677 // uncast const to modify the flag args->ignoreUnrecognized
3678 *(jboolean*)(&args->ignoreUnrecognized) = true;
3679 }
3680
3681 // Parse specified settings file
3682 if (settings_file_specified) {
3683 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3684 return JNI_EINVAL;
3685 }
3686 } else {
3687 #ifdef ASSERT
3688 // Parse default .hotspotrc settings file
3689 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3690 return JNI_EINVAL;
3691 }
3692 #else
3693 struct stat buf;
3694 if (os::stat(hotspotrc, &buf) == 0) {
3695 needs_hotspotrc_warning = true;
3696 }
3697 #endif
3698 }
3699
3700 if (PrintVMOptions) {
3701 for (index = 0; index < args->nOptions; index++) {
3702 const JavaVMOption *option = args->options + index;
3703 if (match_option(option, "-XX:", &tail)) {
3704 logOption(tail);
3705 }
3706 }
3707 }
3708
3709 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3710 jint result = parse_vm_init_args(args);
3711 if (result != JNI_OK) {
3712 return result;
3713 }
3714
3715 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3716 SharedArchivePath = get_shared_archive_path();
3717 if (SharedArchivePath == NULL) {
3718 return JNI_ENOMEM;
3719 }
3720
3721 // Delay warning until here so that we've had a chance to process
3722 // the -XX:-PrintWarnings flag
3723 if (needs_hotspotrc_warning) {
3724 warning("%s file is present but has been ignored. "
3725 "Run with -XX:Flags=%s to load the file.",
3726 hotspotrc, hotspotrc);
3727 }
3728
3729 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3730 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3731 #endif
3732
3733 #if INCLUDE_ALL_GCS
3734 #if (defined JAVASE_EMBEDDED || defined ARM)
3735 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3736 #endif
3737 #endif
3738
3739 #ifndef PRODUCT
3740 if (TraceBytecodesAt != 0) {
3741 TraceBytecodes = true;
3742 }
3743 if (CountCompiledCalls) {
3744 if (UseCounterDecay) {
3745 warning("UseCounterDecay disabled because CountCalls is set");
3746 UseCounterDecay = false;
3747 }
3748 }
3749 #endif // PRODUCT
3750
3751 if (ScavengeRootsInCode == 0) {
3752 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3753 warning("forcing ScavengeRootsInCode non-zero");
3754 }
3755 ScavengeRootsInCode = 1;
3756 }
3757
3758 if (PrintGCDetails) {
3759 // Turn on -verbose:gc options as well
3760 PrintGC = true;
3761 }
3762
3763 // Set object alignment values.
3764 set_object_alignment();
3765
3766 #if !INCLUDE_ALL_GCS
3767 force_serial_gc();
3768 #endif // INCLUDE_ALL_GCS
3769 #if !INCLUDE_CDS
3770 if (DumpSharedSpaces || RequireSharedSpaces) {
3771 jio_fprintf(defaultStream::error_stream(),
3772 "Shared spaces are not supported in this VM\n");
3773 return JNI_ERR;
3774 }
3775 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3776 warning("Shared spaces are not supported in this VM");
3777 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3778 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3779 }
3780 no_shared_spaces("CDS Disabled");
3781 #endif // INCLUDE_CDS
3782
3783 return JNI_OK;
3784 }
3785
3786 jint Arguments::apply_ergo() {
3787
3788 // Set flags based on ergonomics.
3789 set_ergonomics_flags();
3790
3791 set_shared_spaces_flags();
3792
3793 // Check the GC selections again.
3794 if (!check_gc_consistency()) {
3795 return JNI_EINVAL;
3796 }
3797
3798 if (TieredCompilation) {
3799 set_tiered_flags();
3800 } else {
3801 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3802 if (CompilationPolicyChoice >= 2) {
3803 vm_exit_during_initialization(
3804 "Incompatible compilation policy selected", NULL);
3805 }
3806 }
3807 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3808 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3809 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3810 }
3811
3812
3813 // Set heap size based on available physical memory
3814 set_heap_size();
3815
3816 #if INCLUDE_ALL_GCS
3817 // Set per-collector flags
3818 if (UseParallelGC || UseParallelOldGC) {
3819 set_parallel_gc_flags();
3820 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3821 set_cms_and_parnew_gc_flags();
3822 } else if (UseParNewGC) { // Skipped if CMS is set above
3823 set_parnew_gc_flags();
3824 } else if (UseG1GC) {
3825 set_g1_gc_flags();
3826 }
3827 check_deprecated_gcs();
3828 check_deprecated_gc_flags();
3829 if (AssumeMP && !UseSerialGC) {
3830 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3831 warning("If the number of processors is expected to increase from one, then"
3832 " you should configure the number of parallel GC threads appropriately"
3833 " using -XX:ParallelGCThreads=N");
3834 }
3835 }
3836 if (MinHeapFreeRatio == 100) {
3837 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3838 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3839 }
3840 #else // INCLUDE_ALL_GCS
3841 assert(verify_serial_gc_flags(), "SerialGC unset");
3842 #endif // INCLUDE_ALL_GCS
3843
3844 // Initialize Metaspace flags and alignments
3845 Metaspace::ergo_initialize();
3846
3847 // Set bytecode rewriting flags
3848 set_bytecode_flags();
3849
3850 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3851 set_aggressive_opts_flags();
3852
3853 // Turn off biased locking for locking debug mode flags,
3854 // which are subtly different from each other but neither works with
3855 // biased locking
3856 if (UseHeavyMonitors
3857 #ifdef COMPILER1
3858 || !UseFastLocking
3859 #endif // COMPILER1
3860 ) {
3861 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3862 // flag set to true on command line; warn the user that they
3863 // can't enable biased locking here
3864 warning("Biased Locking is not supported with locking debug flags"
3865 "; ignoring UseBiasedLocking flag." );
3866 }
3867 UseBiasedLocking = false;
3868 }
3869
3870 #ifdef ZERO
3871 // Clear flags not supported on zero.
3872 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3873 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3874 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3875 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3876 #endif // CC_INTERP
3877
3878 #ifdef COMPILER2
3879 if (!EliminateLocks) {
3880 EliminateNestedLocks = false;
3881 }
3882 if (!Inline) {
3883 IncrementalInline = false;
3884 }
3885 #ifndef PRODUCT
3886 if (!IncrementalInline) {
3887 AlwaysIncrementalInline = false;
3888 }
3889 #endif
3890 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3891 // nothing to use the profiling, turn if off
3892 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3893 }
3894 #endif
3895
3896 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3897 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3898 DebugNonSafepoints = true;
3899 }
3900
3901 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3902 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3903 }
3904
3905 #ifndef PRODUCT
3906 if (CompileTheWorld) {
3907 // Force NmethodSweeper to sweep whole CodeCache each time.
3908 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3909 NmethodSweepFraction = 1;
3910 }
3911 }
3912
3913 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3914 if (use_vm_log()) {
3915 LogVMOutput = true;
3916 }
3917 }
3918 #endif // PRODUCT
3919
3920 if (PrintCommandLineFlags) {
3921 CommandLineFlags::printSetFlags(tty);
3922 }
3923
3924 // Apply CPU specific policy for the BiasedLocking
3925 if (UseBiasedLocking) {
3926 if (!VM_Version::use_biased_locking() &&
3927 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3928 UseBiasedLocking = false;
3929 }
3930 }
3931 #ifdef COMPILER2
3932 if (!UseBiasedLocking || EmitSync != 0) {
3933 UseOptoBiasInlining = false;
3934 }
3935 #endif
3936
3937 return JNI_OK;
3938 }
3939
3940 jint Arguments::adjust_after_os() {
3941 if (UseNUMA) {
3942 if (UseParallelGC || UseParallelOldGC) {
3943 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3944 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3945 }
3946 }
3947 // UseNUMAInterleaving is set to ON for all collectors and
3948 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3949 // such as the parallel collector for Linux and Solaris will
3950 // interleave old gen and survivor spaces on top of NUMA
3951 // allocation policy for the eden space.
3952 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3953 // all platforms and ParallelGC on Windows will interleave all
3954 // of the heap spaces across NUMA nodes.
3955 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3956 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3957 }
3958 }
3959 return JNI_OK;
3960 }
3961
3962 int Arguments::PropertyList_count(SystemProperty* pl) {
3963 int count = 0;
3964 while(pl != NULL) {
3965 count++;
3966 pl = pl->next();
3967 }
3968 return count;
3969 }
3970
3971 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3972 assert(key != NULL, "just checking");
3973 SystemProperty* prop;
3974 for (prop = pl; prop != NULL; prop = prop->next()) {
3975 if (strcmp(key, prop->key()) == 0) return prop->value();
3976 }
3977 return NULL;
3978 }
3979
3980 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3981 int count = 0;
3982 const char* ret_val = NULL;
3983
3984 while(pl != NULL) {
3985 if(count >= index) {
3986 ret_val = pl->key();
3987 break;
3988 }
3989 count++;
3990 pl = pl->next();
3991 }
3992
3993 return ret_val;
3994 }
3995
3996 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3997 int count = 0;
3998 char* ret_val = NULL;
3999
4000 while(pl != NULL) {
4001 if(count >= index) {
4002 ret_val = pl->value();
4003 break;
4004 }
4005 count++;
4006 pl = pl->next();
4007 }
4008
4009 return ret_val;
4010 }
4011
4012 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4013 SystemProperty* p = *plist;
4014 if (p == NULL) {
4015 *plist = new_p;
4016 } else {
4017 while (p->next() != NULL) {
4018 p = p->next();
4019 }
4020 p->set_next(new_p);
4021 }
4022 }
4023
4024 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4025 if (plist == NULL)
4026 return;
4027
4028 SystemProperty* new_p = new SystemProperty(k, v, true);
4029 PropertyList_add(plist, new_p);
4030 }
4031
4032 // This add maintains unique property key in the list.
4033 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4034 if (plist == NULL)
4035 return;
4036
4037 // If property key exist then update with new value.
4038 SystemProperty* prop;
4039 for (prop = *plist; prop != NULL; prop = prop->next()) {
4040 if (strcmp(k, prop->key()) == 0) {
4041 if (append) {
4042 prop->append_value(v);
4043 } else {
4044 prop->set_value(v);
4045 }
4046 return;
4047 }
4048 }
4049
4050 PropertyList_add(plist, k, v);
4051 }
4052
4053 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4054 // Returns true if all of the source pointed by src has been copied over to
4055 // the destination buffer pointed by buf. Otherwise, returns false.
4056 // Notes:
4057 // 1. If the length (buflen) of the destination buffer excluding the
4058 // NULL terminator character is not long enough for holding the expanded
4059 // pid characters, it also returns false instead of returning the partially
4060 // expanded one.
4061 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4062 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4063 char* buf, size_t buflen) {
4064 const char* p = src;
4065 char* b = buf;
4066 const char* src_end = &src[srclen];
4067 char* buf_end = &buf[buflen - 1];
4068
4069 while (p < src_end && b < buf_end) {
4070 if (*p == '%') {
4071 switch (*(++p)) {
4072 case '%': // "%%" ==> "%"
4073 *b++ = *p++;
4074 break;
4075 case 'p': { // "%p" ==> current process id
4076 // buf_end points to the character before the last character so
4077 // that we could write '\0' to the end of the buffer.
4078 size_t buf_sz = buf_end - b + 1;
4079 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4080
4081 // if jio_snprintf fails or the buffer is not long enough to hold
4082 // the expanded pid, returns false.
4083 if (ret < 0 || ret >= (int)buf_sz) {
4084 return false;
4085 } else {
4086 b += ret;
4087 assert(*b == '\0', "fail in copy_expand_pid");
4088 if (p == src_end && b == buf_end + 1) {
4089 // reach the end of the buffer.
4090 return true;
4091 }
4092 }
4093 p++;
4094 break;
4095 }
4096 default :
4097 *b++ = '%';
4098 }
4099 } else {
4100 *b++ = *p++;
4101 }
4102 }
4103 *b = '\0';
4104 return (p == src_end); // return false if not all of the source was copied
4105 }