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 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 #ifndef ZERO
307 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
308 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 #endif // ZERO
310 { NULL, JDK_Version(0), JDK_Version(0) }
311 };
312
313 // Returns true if the flag is obsolete and fits into the range specified
314 // for being ignored. In the case that the flag is ignored, the 'version'
315 // value is filled in with the version number when the flag became
316 // obsolete so that that value can be displayed to the user.
317 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
318 int i = 0;
319 assert(version != NULL, "Must provide a version buffer");
320 while (obsolete_jvm_flags[i].name != NULL) {
321 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
322 // <flag>=xxx form
323 // [-|+]<flag> form
324 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
325 ((s[0] == '+' || s[0] == '-') &&
326 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
327 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
328 *version = flag_status.obsoleted_in;
329 return true;
330 }
331 }
332 i++;
333 }
334 return false;
335 }
336
337 // Constructs the system class path (aka boot class path) from the following
338 // components, in order:
339 //
340 // prefix // from -Xbootclasspath/p:...
341 // endorsed // the expansion of -Djava.endorsed.dirs=...
342 // base // from os::get_system_properties() or -Xbootclasspath=
343 // suffix // from -Xbootclasspath/a:...
344 //
345 // java.endorsed.dirs is a list of directories; any jar or zip files in the
346 // directories are added to the sysclasspath just before the base.
347 //
348 // This could be AllStatic, but it isn't needed after argument processing is
349 // complete.
350 class SysClassPath: public StackObj {
351 public:
352 SysClassPath(const char* base);
353 ~SysClassPath();
354
355 inline void set_base(const char* base);
356 inline void add_prefix(const char* prefix);
357 inline void add_suffix_to_prefix(const char* suffix);
358 inline void add_suffix(const char* suffix);
359 inline void reset_path(const char* base);
360
361 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
362 // property. Must be called after all command-line arguments have been
363 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
364 // combined_path().
365 void expand_endorsed();
366
367 inline const char* get_base() const { return _items[_scp_base]; }
368 inline const char* get_prefix() const { return _items[_scp_prefix]; }
369 inline const char* get_suffix() const { return _items[_scp_suffix]; }
370 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
371
372 // Combine all the components into a single c-heap-allocated string; caller
373 // must free the string if/when no longer needed.
374 char* combined_path();
375
376 private:
377 // Utility routines.
378 static char* add_to_path(const char* path, const char* str, bool prepend);
379 static char* add_jars_to_path(char* path, const char* directory);
380
381 inline void reset_item_at(int index);
382
383 // Array indices for the items that make up the sysclasspath. All except the
384 // base are allocated in the C heap and freed by this class.
385 enum {
386 _scp_prefix, // from -Xbootclasspath/p:...
387 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
388 _scp_base, // the default sysclasspath
389 _scp_suffix, // from -Xbootclasspath/a:...
390 _scp_nitems // the number of items, must be last.
391 };
392
393 const char* _items[_scp_nitems];
394 DEBUG_ONLY(bool _expansion_done;)
395 };
396
397 SysClassPath::SysClassPath(const char* base) {
398 memset(_items, 0, sizeof(_items));
399 _items[_scp_base] = base;
400 DEBUG_ONLY(_expansion_done = false;)
401 }
402
403 SysClassPath::~SysClassPath() {
404 // Free everything except the base.
405 for (int i = 0; i < _scp_nitems; ++i) {
406 if (i != _scp_base) reset_item_at(i);
407 }
408 DEBUG_ONLY(_expansion_done = false;)
409 }
410
411 inline void SysClassPath::set_base(const char* base) {
412 _items[_scp_base] = base;
413 }
414
415 inline void SysClassPath::add_prefix(const char* prefix) {
416 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
417 }
418
419 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
421 }
422
423 inline void SysClassPath::add_suffix(const char* suffix) {
424 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
425 }
426
427 inline void SysClassPath::reset_item_at(int index) {
428 assert(index < _scp_nitems && index != _scp_base, "just checking");
429 if (_items[index] != NULL) {
430 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
431 _items[index] = NULL;
432 }
433 }
434
435 inline void SysClassPath::reset_path(const char* base) {
436 // Clear the prefix and suffix.
437 reset_item_at(_scp_prefix);
438 reset_item_at(_scp_suffix);
439 set_base(base);
440 }
441
442 //------------------------------------------------------------------------------
443
444 void SysClassPath::expand_endorsed() {
445 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
446
447 const char* path = Arguments::get_property("java.endorsed.dirs");
448 if (path == NULL) {
449 path = Arguments::get_endorsed_dir();
450 assert(path != NULL, "no default for java.endorsed.dirs");
451 }
452
453 char* expanded_path = NULL;
454 const char separator = *os::path_separator();
455 const char* const end = path + strlen(path);
456 while (path < end) {
457 const char* tmp_end = strchr(path, separator);
458 if (tmp_end == NULL) {
459 expanded_path = add_jars_to_path(expanded_path, path);
460 path = end;
461 } else {
462 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
463 memcpy(dirpath, path, tmp_end - path);
464 dirpath[tmp_end - path] = '\0';
465 expanded_path = add_jars_to_path(expanded_path, dirpath);
466 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
467 path = tmp_end + 1;
468 }
469 }
470 _items[_scp_endorsed] = expanded_path;
471 DEBUG_ONLY(_expansion_done = true;)
472 }
473
474 // Combine the bootclasspath elements, some of which may be null, into a single
475 // c-heap-allocated string.
476 char* SysClassPath::combined_path() {
477 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
478 assert(_expansion_done, "must call expand_endorsed() first.");
479
480 size_t lengths[_scp_nitems];
481 size_t total_len = 0;
482
483 const char separator = *os::path_separator();
484
485 // Get the lengths.
486 int i;
487 for (i = 0; i < _scp_nitems; ++i) {
488 if (_items[i] != NULL) {
489 lengths[i] = strlen(_items[i]);
490 // Include space for the separator char (or a NULL for the last item).
491 total_len += lengths[i] + 1;
492 }
493 }
494 assert(total_len > 0, "empty sysclasspath not allowed");
495
496 // Copy the _items to a single string.
497 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
498 char* cp_tmp = cp;
499 for (i = 0; i < _scp_nitems; ++i) {
500 if (_items[i] != NULL) {
501 memcpy(cp_tmp, _items[i], lengths[i]);
502 cp_tmp += lengths[i];
503 *cp_tmp++ = separator;
504 }
505 }
506 *--cp_tmp = '\0'; // Replace the extra separator.
507 return cp;
508 }
509
510 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
511 char*
512 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
513 char *cp;
514
515 assert(str != NULL, "just checking");
516 if (path == NULL) {
517 size_t len = strlen(str) + 1;
518 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
519 memcpy(cp, str, len); // copy the trailing null
520 } else {
521 const char separator = *os::path_separator();
522 size_t old_len = strlen(path);
523 size_t str_len = strlen(str);
524 size_t len = old_len + str_len + 2;
525
526 if (prepend) {
527 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
528 char* cp_tmp = cp;
529 memcpy(cp_tmp, str, str_len);
530 cp_tmp += str_len;
531 *cp_tmp = separator;
532 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
533 FREE_C_HEAP_ARRAY(char, path, mtInternal);
534 } else {
535 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
536 char* cp_tmp = cp + old_len;
537 *cp_tmp = separator;
538 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
539 }
540 }
541 return cp;
542 }
543
544 // Scan the directory and append any jar or zip files found to path.
545 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
546 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
547 DIR* dir = os::opendir(directory);
548 if (dir == NULL) return path;
549
550 char dir_sep[2] = { '\0', '\0' };
551 size_t directory_len = strlen(directory);
552 const char fileSep = *os::file_separator();
553 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
554
555 /* Scan the directory for jars/zips, appending them to path. */
556 struct dirent *entry;
557 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
558 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
559 const char* name = entry->d_name;
560 const char* ext = name + strlen(name) - 4;
561 bool isJarOrZip = ext > name &&
562 (os::file_name_strcmp(ext, ".jar") == 0 ||
563 os::file_name_strcmp(ext, ".zip") == 0);
564 if (isJarOrZip) {
565 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
566 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
567 path = add_to_path(path, jarpath, false);
568 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
569 }
570 }
571 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
572 os::closedir(dir);
573 return path;
574 }
575
576 // Parses a memory size specification string.
577 static bool atomull(const char *s, julong* result) {
578 julong n = 0;
579 int args_read = 0;
580 bool is_hex = false;
581 // Skip leading 0[xX] for hexadecimal
582 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
583 s += 2;
584 is_hex = true;
585 args_read = sscanf(s, JULONG_FORMAT_X, &n);
586 } else {
587 args_read = sscanf(s, JULONG_FORMAT, &n);
588 }
589 if (args_read != 1) {
590 return false;
591 }
592 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
593 s++;
594 }
595 // 4705540: illegal if more characters are found after the first non-digit
596 if (strlen(s) > 1) {
597 return false;
598 }
599 switch (*s) {
600 case 'T': case 't':
601 *result = n * G * K;
602 // Check for overflow.
603 if (*result/((julong)G * K) != n) return false;
604 return true;
605 case 'G': case 'g':
606 *result = n * G;
607 if (*result/G != n) return false;
608 return true;
609 case 'M': case 'm':
610 *result = n * M;
611 if (*result/M != n) return false;
612 return true;
613 case 'K': case 'k':
614 *result = n * K;
615 if (*result/K != n) return false;
616 return true;
617 case '\0':
618 *result = n;
619 return true;
620 default:
621 return false;
622 }
623 }
624
625 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
626 if (size < min_size) return arg_too_small;
627 // Check that size will fit in a size_t (only relevant on 32-bit)
628 if (size > max_uintx) return arg_too_big;
629 return arg_in_range;
630 }
631
632 // Describe an argument out of range error
633 void Arguments::describe_range_error(ArgsRange errcode) {
634 switch(errcode) {
635 case arg_too_big:
636 jio_fprintf(defaultStream::error_stream(),
637 "The specified size exceeds the maximum "
638 "representable size.\n");
639 break;
640 case arg_too_small:
641 case arg_unreadable:
642 case arg_in_range:
643 // do nothing for now
644 break;
645 default:
646 ShouldNotReachHere();
647 }
648 }
649
650 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
651 return CommandLineFlags::boolAtPut(name, &value, origin);
652 }
653
654 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
655 double v;
656 if (sscanf(value, "%lf", &v) != 1) {
657 return false;
658 }
659
660 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
661 return true;
662 }
663 return false;
664 }
665
666 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
667 julong v;
668 intx intx_v;
669 bool is_neg = false;
670 // Check the sign first since atomull() parses only unsigned values.
671 if (*value == '-') {
672 if (!CommandLineFlags::intxAt(name, &intx_v)) {
673 return false;
674 }
675 value++;
676 is_neg = true;
677 }
678 if (!atomull(value, &v)) {
679 return false;
680 }
681 intx_v = (intx) v;
682 if (is_neg) {
683 intx_v = -intx_v;
684 }
685 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
686 return true;
687 }
688 uintx uintx_v = (uintx) v;
689 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
690 return true;
691 }
692 uint64_t uint64_t_v = (uint64_t) v;
693 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
694 return true;
695 }
696 return false;
697 }
698
699 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
700 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
701 // Contract: CommandLineFlags always returns a pointer that needs freeing.
702 FREE_C_HEAP_ARRAY(char, value, mtInternal);
703 return true;
704 }
705
706 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
707 const char* old_value = "";
708 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
709 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
710 size_t new_len = strlen(new_value);
711 const char* value;
712 char* free_this_too = NULL;
713 if (old_len == 0) {
714 value = new_value;
715 } else if (new_len == 0) {
716 value = old_value;
717 } else {
718 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
719 // each new setting adds another LINE to the switch:
720 sprintf(buf, "%s\n%s", old_value, new_value);
721 value = buf;
722 free_this_too = buf;
723 }
724 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
725 // CommandLineFlags always returns a pointer that needs freeing.
726 FREE_C_HEAP_ARRAY(char, value, mtInternal);
727 if (free_this_too != NULL) {
728 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
729 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
730 }
731 return true;
732 }
733
734 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
735
736 // range of acceptable characters spelled out for portability reasons
737 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
738 #define BUFLEN 255
739 char name[BUFLEN+1];
740 char dummy;
741
742 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
743 return set_bool_flag(name, false, origin);
744 }
745 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
746 return set_bool_flag(name, true, origin);
747 }
748
749 char punct;
750 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
751 const char* value = strchr(arg, '=') + 1;
752 Flag* flag = Flag::find_flag(name, strlen(name));
753 if (flag != NULL && flag->is_ccstr()) {
754 if (flag->ccstr_accumulates()) {
755 return append_to_string_flag(name, value, origin);
756 } else {
757 if (value[0] == '\0') {
758 value = NULL;
759 }
760 return set_string_flag(name, value, origin);
761 }
762 }
763 }
764
765 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
766 const char* value = strchr(arg, '=') + 1;
767 // -XX:Foo:=xxx will reset the string flag to the given value.
768 if (value[0] == '\0') {
769 value = NULL;
770 }
771 return set_string_flag(name, value, origin);
772 }
773
774 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
775 #define SIGNED_NUMBER_RANGE "[-0123456789]"
776 #define NUMBER_RANGE "[0123456789]"
777 char value[BUFLEN + 1];
778 char value2[BUFLEN + 1];
779 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
780 // Looks like a floating-point number -- try again with more lenient format string
781 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
782 return set_fp_numeric_flag(name, value, origin);
783 }
784 }
785
786 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
787 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
788 return set_numeric_flag(name, value, origin);
789 }
790
791 return false;
792 }
793
794 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
795 assert(bldarray != NULL, "illegal argument");
796
797 if (arg == NULL) {
798 return;
799 }
800
801 int new_count = *count + 1;
802
803 // expand the array and add arg to the last element
804 if (*bldarray == NULL) {
805 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
806 } else {
807 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
808 }
809 (*bldarray)[*count] = os::strdup_check_oom(arg);
810 *count = new_count;
811 }
812
813 void Arguments::build_jvm_args(const char* arg) {
814 add_string(&_jvm_args_array, &_num_jvm_args, arg);
815 }
816
817 void Arguments::build_jvm_flags(const char* arg) {
818 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
819 }
820
821 // utility function to return a string that concatenates all
822 // strings in a given char** array
823 const char* Arguments::build_resource_string(char** args, int count) {
824 if (args == NULL || count == 0) {
825 return NULL;
826 }
827 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
828 for (int i = 1; i < count; i++) {
829 length += strlen(args[i]) + 1; // add 1 for a space
830 }
831 char* s = NEW_RESOURCE_ARRAY(char, length);
832 strcpy(s, args[0]);
833 for (int j = 1; j < count; j++) {
834 strcat(s, " ");
835 strcat(s, args[j]);
836 }
837 return (const char*) s;
838 }
839
840 void Arguments::print_on(outputStream* st) {
841 st->print_cr("VM Arguments:");
842 if (num_jvm_flags() > 0) {
843 st->print("jvm_flags: "); print_jvm_flags_on(st);
844 }
845 if (num_jvm_args() > 0) {
846 st->print("jvm_args: "); print_jvm_args_on(st);
847 }
848 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
849 if (_java_class_path != NULL) {
850 char* path = _java_class_path->value();
851 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
852 }
853 st->print_cr("Launcher Type: %s", _sun_java_launcher);
854 }
855
856 void Arguments::print_jvm_flags_on(outputStream* st) {
857 if (_num_jvm_flags > 0) {
858 for (int i=0; i < _num_jvm_flags; i++) {
859 st->print("%s ", _jvm_flags_array[i]);
860 }
861 st->cr();
862 }
863 }
864
865 void Arguments::print_jvm_args_on(outputStream* st) {
866 if (_num_jvm_args > 0) {
867 for (int i=0; i < _num_jvm_args; i++) {
868 st->print("%s ", _jvm_args_array[i]);
869 }
870 st->cr();
871 }
872 }
873
874 bool Arguments::process_argument(const char* arg,
875 jboolean ignore_unrecognized, Flag::Flags origin) {
876
877 JDK_Version since = JDK_Version();
878
879 if (parse_argument(arg, origin) || ignore_unrecognized) {
880 return true;
881 }
882
883 bool has_plus_minus = (*arg == '+' || *arg == '-');
884 const char* const argname = has_plus_minus ? arg + 1 : arg;
885 if (is_newly_obsolete(arg, &since)) {
886 char version[256];
887 since.to_string(version, sizeof(version));
888 warning("ignoring option %s; support was removed in %s", argname, version);
889 return true;
890 }
891
892 // For locked flags, report a custom error message if available.
893 // Otherwise, report the standard unrecognized VM option.
894
895 size_t arg_len;
896 const char* equal_sign = strchr(argname, '=');
897 if (equal_sign == NULL) {
898 arg_len = strlen(argname);
899 } else {
900 arg_len = equal_sign - argname;
901 }
902
903 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
904 if (found_flag != NULL) {
905 char locked_message_buf[BUFLEN];
906 found_flag->get_locked_message(locked_message_buf, BUFLEN);
907 if (strlen(locked_message_buf) == 0) {
908 if (found_flag->is_bool() && !has_plus_minus) {
909 jio_fprintf(defaultStream::error_stream(),
910 "Missing +/- setting for VM option '%s'\n", argname);
911 } else if (!found_flag->is_bool() && has_plus_minus) {
912 jio_fprintf(defaultStream::error_stream(),
913 "Unexpected +/- setting in VM option '%s'\n", argname);
914 } else {
915 jio_fprintf(defaultStream::error_stream(),
916 "Improperly specified VM option '%s'\n", argname);
917 }
918 } else {
919 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
920 }
921 } else {
922 jio_fprintf(defaultStream::error_stream(),
923 "Unrecognized VM option '%s'\n", argname);
924 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
925 if (fuzzy_matched != NULL) {
926 jio_fprintf(defaultStream::error_stream(),
927 "Did you mean '%s%s%s'?\n",
928 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
929 fuzzy_matched->_name,
930 (fuzzy_matched->is_bool()) ? "" : "=<value>");
931 }
932 }
933
934 // allow for commandline "commenting out" options like -XX:#+Verbose
935 return arg[0] == '#';
936 }
937
938 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
939 FILE* stream = fopen(file_name, "rb");
940 if (stream == NULL) {
941 if (should_exist) {
942 jio_fprintf(defaultStream::error_stream(),
943 "Could not open settings file %s\n", file_name);
944 return false;
945 } else {
946 return true;
947 }
948 }
949
950 char token[1024];
951 int pos = 0;
952
953 bool in_white_space = true;
954 bool in_comment = false;
955 bool in_quote = false;
956 char quote_c = 0;
957 bool result = true;
958
959 int c = getc(stream);
960 while(c != EOF && pos < (int)(sizeof(token)-1)) {
961 if (in_white_space) {
962 if (in_comment) {
963 if (c == '\n') in_comment = false;
964 } else {
965 if (c == '#') in_comment = true;
966 else if (!isspace(c)) {
967 in_white_space = false;
968 token[pos++] = c;
969 }
970 }
971 } else {
972 if (c == '\n' || (!in_quote && isspace(c))) {
973 // token ends at newline, or at unquoted whitespace
974 // this allows a way to include spaces in string-valued options
975 token[pos] = '\0';
976 logOption(token);
977 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
978 build_jvm_flags(token);
979 pos = 0;
980 in_white_space = true;
981 in_quote = false;
982 } else if (!in_quote && (c == '\'' || c == '"')) {
983 in_quote = true;
984 quote_c = c;
985 } else if (in_quote && (c == quote_c)) {
986 in_quote = false;
987 } else {
988 token[pos++] = c;
989 }
990 }
991 c = getc(stream);
992 }
993 if (pos > 0) {
994 token[pos] = '\0';
995 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
996 build_jvm_flags(token);
997 }
998 fclose(stream);
999 return result;
1000 }
1001
1002 //=============================================================================================================
1003 // Parsing of properties (-D)
1004
1005 const char* Arguments::get_property(const char* key) {
1006 return PropertyList_get_value(system_properties(), key);
1007 }
1008
1009 bool Arguments::add_property(const char* prop) {
1010 const char* eq = strchr(prop, '=');
1011 char* key;
1012 // ns must be static--its address may be stored in a SystemProperty object.
1013 const static char ns[1] = {0};
1014 char* value = (char *)ns;
1015
1016 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1017 key = AllocateHeap(key_len + 1, mtInternal);
1018 strncpy(key, prop, key_len);
1019 key[key_len] = '\0';
1020
1021 if (eq != NULL) {
1022 size_t value_len = strlen(prop) - key_len - 1;
1023 value = AllocateHeap(value_len + 1, mtInternal);
1024 strncpy(value, &prop[key_len + 1], value_len + 1);
1025 }
1026
1027 if (strcmp(key, "java.compiler") == 0) {
1028 process_java_compiler_argument(value);
1029 FreeHeap(key);
1030 if (eq != NULL) {
1031 FreeHeap(value);
1032 }
1033 return true;
1034 } else if (strcmp(key, "sun.java.command") == 0) {
1035 _java_command = value;
1036
1037 // Record value in Arguments, but let it get passed to Java.
1038 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1039 strcmp(key, "sun.java.launcher.pid") == 0) {
1040 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1041 // private and are processed in process_sun_java_launcher_properties();
1042 // the sun.java.launcher property is passed on to the java application
1043 FreeHeap(key);
1044 if (eq != NULL) {
1045 FreeHeap(value);
1046 }
1047 return true;
1048 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1049 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1050 // its value without going through the property list or making a Java call.
1051 _java_vendor_url_bug = value;
1052 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1053 PropertyList_unique_add(&_system_properties, key, value, true);
1054 return true;
1055 }
1056 // Create new property and add at the end of the list
1057 PropertyList_unique_add(&_system_properties, key, value);
1058 return true;
1059 }
1060
1061 //===========================================================================================================
1062 // Setting int/mixed/comp mode flags
1063
1064 void Arguments::set_mode_flags(Mode mode) {
1065 // Set up default values for all flags.
1066 // If you add a flag to any of the branches below,
1067 // add a default value for it here.
1068 set_java_compiler(false);
1069 _mode = mode;
1070
1071 // Ensure Agent_OnLoad has the correct initial values.
1072 // This may not be the final mode; mode may change later in onload phase.
1073 PropertyList_unique_add(&_system_properties, "java.vm.info",
1074 (char*)VM_Version::vm_info_string(), false);
1075
1076 UseInterpreter = true;
1077 UseCompiler = true;
1078 UseLoopCounter = true;
1079
1080 // Default values may be platform/compiler dependent -
1081 // use the saved values
1082 ClipInlining = Arguments::_ClipInlining;
1083 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1084 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1085 BackgroundCompilation = Arguments::_BackgroundCompilation;
1086
1087 // Change from defaults based on mode
1088 switch (mode) {
1089 default:
1090 ShouldNotReachHere();
1091 break;
1092 case _int:
1093 UseCompiler = false;
1094 UseLoopCounter = false;
1095 AlwaysCompileLoopMethods = false;
1096 UseOnStackReplacement = false;
1097 break;
1098 case _mixed:
1099 // same as default
1100 break;
1101 case _comp:
1102 UseInterpreter = false;
1103 BackgroundCompilation = false;
1104 ClipInlining = false;
1105 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1106 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1107 // compile a level 4 (C2) and then continue executing it.
1108 if (TieredCompilation) {
1109 Tier3InvokeNotifyFreqLog = 0;
1110 Tier4InvocationThreshold = 0;
1111 }
1112 break;
1113 }
1114 }
1115
1116 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1117 // Conflict: required to use shared spaces (-Xshare:on), but
1118 // incompatible command line options were chosen.
1119
1120 static void no_shared_spaces(const char* message) {
1121 if (RequireSharedSpaces) {
1122 jio_fprintf(defaultStream::error_stream(),
1123 "Class data sharing is inconsistent with other specified options.\n");
1124 vm_exit_during_initialization("Unable to use shared archive.", message);
1125 } else {
1126 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1127 }
1128 }
1129 #endif
1130
1131 void Arguments::set_tiered_flags() {
1132 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1133 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1134 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1135 }
1136 if (CompilationPolicyChoice < 2) {
1137 vm_exit_during_initialization(
1138 "Incompatible compilation policy selected", NULL);
1139 }
1140 // Increase the code cache size - tiered compiles a lot more.
1141 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1142 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1143 }
1144 if (!UseInterpreter) { // -Xcomp
1145 Tier3InvokeNotifyFreqLog = 0;
1146 Tier4InvocationThreshold = 0;
1147 }
1148 }
1149
1150 /**
1151 * Returns the minimum number of compiler threads needed to run the JVM. The following
1152 * configurations are possible.
1153 *
1154 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1155 * compiler threads is 0.
1156 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1157 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1158 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1159 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1160 * C1 can be used, so the minimum number of compiler threads is 1.
1161 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1162 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1163 * the minimum number of compiler threads is 2.
1164 */
1165 int Arguments::get_min_number_of_compiler_threads() {
1166 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1167 return 0; // case 1
1168 #else
1169 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1170 return 1; // case 2 or case 3
1171 }
1172 return 2; // case 4 (tiered)
1173 #endif
1174 }
1175
1176 #if INCLUDE_ALL_GCS
1177 static void disable_adaptive_size_policy(const char* collector_name) {
1178 if (UseAdaptiveSizePolicy) {
1179 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1180 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1181 collector_name);
1182 }
1183 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1184 }
1185 }
1186
1187 void Arguments::set_parnew_gc_flags() {
1188 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1189 "control point invariant");
1190 assert(UseParNewGC, "Error");
1191
1192 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1193 disable_adaptive_size_policy("UseParNewGC");
1194
1195 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1196 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1197 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1198 } else if (ParallelGCThreads == 0) {
1199 jio_fprintf(defaultStream::error_stream(),
1200 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1201 vm_exit(1);
1202 }
1203
1204 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1205 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1206 // we set them to 1024 and 1024.
1207 // See CR 6362902.
1208 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1209 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1210 }
1211 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1212 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1213 }
1214
1215 // When using compressed oops, we use local overflow stacks,
1216 // rather than using a global overflow list chained through
1217 // the klass word of the object's pre-image.
1218 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1219 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1220 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1221 }
1222 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1223 }
1224 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1225 }
1226
1227 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1228 // sparc/solaris for certain applications, but would gain from
1229 // further optimization and tuning efforts, and would almost
1230 // certainly gain from analysis of platform and environment.
1231 void Arguments::set_cms_and_parnew_gc_flags() {
1232 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1233 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1234
1235 // If we are using CMS, we prefer to UseParNewGC,
1236 // unless explicitly forbidden.
1237 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1238 FLAG_SET_ERGO(bool, UseParNewGC, true);
1239 }
1240
1241 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1242 disable_adaptive_size_policy("UseConcMarkSweepGC");
1243
1244 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1245 // as needed.
1246 if (UseParNewGC) {
1247 set_parnew_gc_flags();
1248 }
1249
1250 size_t max_heap = align_size_down(MaxHeapSize,
1251 CardTableRS::ct_max_alignment_constraint());
1252
1253 // Now make adjustments for CMS
1254 intx tenuring_default = (intx)6;
1255 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1256
1257 // Preferred young gen size for "short" pauses:
1258 // upper bound depends on # of threads and NewRatio.
1259 const uintx parallel_gc_threads =
1260 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1261 const size_t preferred_max_new_size_unaligned =
1262 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1263 size_t preferred_max_new_size =
1264 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1265
1266 // Unless explicitly requested otherwise, size young gen
1267 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1268
1269 // If either MaxNewSize or NewRatio is set on the command line,
1270 // assume the user is trying to set the size of the young gen.
1271 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1272
1273 // Set MaxNewSize to our calculated preferred_max_new_size unless
1274 // NewSize was set on the command line and it is larger than
1275 // preferred_max_new_size.
1276 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1277 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1278 } else {
1279 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1280 }
1281 if (PrintGCDetails && Verbose) {
1282 // Too early to use gclog_or_tty
1283 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1284 }
1285
1286 // Code along this path potentially sets NewSize and OldSize
1287 if (PrintGCDetails && Verbose) {
1288 // Too early to use gclog_or_tty
1289 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1290 " initial_heap_size: " SIZE_FORMAT
1291 " max_heap: " SIZE_FORMAT,
1292 min_heap_size(), InitialHeapSize, max_heap);
1293 }
1294 size_t min_new = preferred_max_new_size;
1295 if (FLAG_IS_CMDLINE(NewSize)) {
1296 min_new = NewSize;
1297 }
1298 if (max_heap > min_new && min_heap_size() > min_new) {
1299 // Unless explicitly requested otherwise, make young gen
1300 // at least min_new, and at most preferred_max_new_size.
1301 if (FLAG_IS_DEFAULT(NewSize)) {
1302 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1303 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1304 if (PrintGCDetails && Verbose) {
1305 // Too early to use gclog_or_tty
1306 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1307 }
1308 }
1309 // Unless explicitly requested otherwise, size old gen
1310 // so it's NewRatio x of NewSize.
1311 if (FLAG_IS_DEFAULT(OldSize)) {
1312 if (max_heap > NewSize) {
1313 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1314 if (PrintGCDetails && Verbose) {
1315 // Too early to use gclog_or_tty
1316 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1317 }
1318 }
1319 }
1320 }
1321 }
1322 // Unless explicitly requested otherwise, definitely
1323 // promote all objects surviving "tenuring_default" scavenges.
1324 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1325 FLAG_IS_DEFAULT(SurvivorRatio)) {
1326 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1327 }
1328 // If we decided above (or user explicitly requested)
1329 // `promote all' (via MaxTenuringThreshold := 0),
1330 // prefer minuscule survivor spaces so as not to waste
1331 // space for (non-existent) survivors
1332 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1333 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1334 }
1335 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1336 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1337 // This is done in order to make ParNew+CMS configuration to work
1338 // with YoungPLABSize and OldPLABSize options.
1339 // See CR 6362902.
1340 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1341 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1342 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1343 // is. In this situation let CMSParPromoteBlocksToClaim follow
1344 // the value (either from the command line or ergonomics) of
1345 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1346 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1347 } else {
1348 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1349 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1350 // we'll let it to take precedence.
1351 jio_fprintf(defaultStream::error_stream(),
1352 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1353 " options are specified for the CMS collector."
1354 " CMSParPromoteBlocksToClaim will take precedence.\n");
1355 }
1356 }
1357 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1358 // OldPLAB sizing manually turned off: Use a larger default setting,
1359 // unless it was manually specified. This is because a too-low value
1360 // will slow down scavenges.
1361 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1362 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1363 }
1364 }
1365 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1366 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1367 // If either of the static initialization defaults have changed, note this
1368 // modification.
1369 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1370 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1371 }
1372 if (PrintGCDetails && Verbose) {
1373 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1374 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1375 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1376 }
1377 }
1378 #endif // INCLUDE_ALL_GCS
1379
1380 void set_object_alignment() {
1381 // Object alignment.
1382 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1383 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1384 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1385 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1386 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1387 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1388
1389 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1390 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1391
1392 // Oop encoding heap max
1393 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1394
1395 #if INCLUDE_ALL_GCS
1396 // Set CMS global values
1397 CompactibleFreeListSpace::set_cms_values();
1398 #endif // INCLUDE_ALL_GCS
1399 }
1400
1401 bool verify_object_alignment() {
1402 // Object alignment.
1403 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1404 jio_fprintf(defaultStream::error_stream(),
1405 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1406 (int)ObjectAlignmentInBytes);
1407 return false;
1408 }
1409 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1410 jio_fprintf(defaultStream::error_stream(),
1411 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1412 (int)ObjectAlignmentInBytes, BytesPerLong);
1413 return false;
1414 }
1415 // It does not make sense to have big object alignment
1416 // since a space lost due to alignment will be greater
1417 // then a saved space from compressed oops.
1418 if ((int)ObjectAlignmentInBytes > 256) {
1419 jio_fprintf(defaultStream::error_stream(),
1420 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1421 (int)ObjectAlignmentInBytes);
1422 return false;
1423 }
1424 // In case page size is very small.
1425 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1426 jio_fprintf(defaultStream::error_stream(),
1427 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1428 (int)ObjectAlignmentInBytes, os::vm_page_size());
1429 return false;
1430 }
1431 if(SurvivorAlignmentInBytes == 0) {
1432 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1433 } else {
1434 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1435 jio_fprintf(defaultStream::error_stream(),
1436 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1437 (int)SurvivorAlignmentInBytes);
1438 return false;
1439 }
1440 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1441 jio_fprintf(defaultStream::error_stream(),
1442 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1443 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1444 return false;
1445 }
1446 }
1447 return true;
1448 }
1449
1450 size_t Arguments::max_heap_for_compressed_oops() {
1451 // Avoid sign flip.
1452 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1453 // We need to fit both the NULL page and the heap into the memory budget, while
1454 // keeping alignment constraints of the heap. To guarantee the latter, as the
1455 // NULL page is located before the heap, we pad the NULL page to the conservative
1456 // maximum alignment that the GC may ever impose upon the heap.
1457 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1458 _conservative_max_heap_alignment);
1459
1460 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1461 NOT_LP64(ShouldNotReachHere(); return 0);
1462 }
1463
1464 bool Arguments::should_auto_select_low_pause_collector() {
1465 if (UseAutoGCSelectPolicy &&
1466 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1467 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1468 if (PrintGCDetails) {
1469 // Cannot use gclog_or_tty yet.
1470 tty->print_cr("Automatic selection of the low pause collector"
1471 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1472 }
1473 return true;
1474 }
1475 return false;
1476 }
1477
1478 void Arguments::set_use_compressed_oops() {
1479 #ifndef ZERO
1480 #ifdef _LP64
1481 // MaxHeapSize is not set up properly at this point, but
1482 // the only value that can override MaxHeapSize if we are
1483 // to use UseCompressedOops is InitialHeapSize.
1484 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1485
1486 if (max_heap_size <= max_heap_for_compressed_oops()) {
1487 #if !defined(COMPILER1) || defined(TIERED)
1488 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1489 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1490 }
1491 #endif
1492 #ifdef _WIN64
1493 if (UseLargePages && UseCompressedOops) {
1494 // Cannot allocate guard pages for implicit checks in indexed addressing
1495 // mode, when large pages are specified on windows.
1496 // This flag could be switched ON if narrow oop base address is set to 0,
1497 // see code in Universe::initialize_heap().
1498 Universe::set_narrow_oop_use_implicit_null_checks(false);
1499 }
1500 #endif // _WIN64
1501 } else {
1502 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1503 warning("Max heap size too large for Compressed Oops");
1504 FLAG_SET_DEFAULT(UseCompressedOops, false);
1505 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1506 }
1507 }
1508 #endif // _LP64
1509 #endif // ZERO
1510 }
1511
1512
1513 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1514 // set_use_compressed_oops().
1515 void Arguments::set_use_compressed_klass_ptrs() {
1516 #ifndef ZERO
1517 #ifdef _LP64
1518 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1519 if (!UseCompressedOops) {
1520 if (UseCompressedClassPointers) {
1521 warning("UseCompressedClassPointers requires UseCompressedOops");
1522 }
1523 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1524 } else {
1525 // Turn on UseCompressedClassPointers too
1526 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1527 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1528 }
1529 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1530 if (UseCompressedClassPointers) {
1531 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1532 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1533 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1534 }
1535 }
1536 }
1537 #endif // _LP64
1538 #endif // !ZERO
1539 }
1540
1541 void Arguments::set_conservative_max_heap_alignment() {
1542 // The conservative maximum required alignment for the heap is the maximum of
1543 // the alignments imposed by several sources: any requirements from the heap
1544 // itself, the collector policy and the maximum page size we may run the VM
1545 // with.
1546 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1547 #if INCLUDE_ALL_GCS
1548 if (UseParallelGC) {
1549 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1550 } else if (UseG1GC) {
1551 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1552 }
1553 #endif // INCLUDE_ALL_GCS
1554 _conservative_max_heap_alignment = MAX4(heap_alignment,
1555 (size_t)os::vm_allocation_granularity(),
1556 os::max_page_size(),
1557 CollectorPolicy::compute_heap_alignment());
1558 }
1559
1560 void Arguments::set_ergonomics_flags() {
1561
1562 if (os::is_server_class_machine()) {
1563 // If no other collector is requested explicitly,
1564 // let the VM select the collector based on
1565 // machine class and automatic selection policy.
1566 if (!UseSerialGC &&
1567 !UseConcMarkSweepGC &&
1568 !UseG1GC &&
1569 !UseParNewGC &&
1570 FLAG_IS_DEFAULT(UseParallelGC)) {
1571 if (should_auto_select_low_pause_collector()) {
1572 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1573 } else {
1574 FLAG_SET_ERGO(bool, UseParallelGC, true);
1575 }
1576 }
1577 }
1578 #ifdef COMPILER2
1579 // Shared spaces work fine with other GCs but causes bytecode rewriting
1580 // to be disabled, which hurts interpreter performance and decreases
1581 // server performance. When -server is specified, keep the default off
1582 // unless it is asked for. Future work: either add bytecode rewriting
1583 // at link time, or rewrite bytecodes in non-shared methods.
1584 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1585 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1586 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1587 }
1588 #endif
1589
1590 set_conservative_max_heap_alignment();
1591
1592 #ifndef ZERO
1593 #ifdef _LP64
1594 set_use_compressed_oops();
1595
1596 // set_use_compressed_klass_ptrs() must be called after calling
1597 // set_use_compressed_oops().
1598 set_use_compressed_klass_ptrs();
1599
1600 // Also checks that certain machines are slower with compressed oops
1601 // in vm_version initialization code.
1602 #endif // _LP64
1603 #endif // !ZERO
1604 }
1605
1606 void Arguments::set_parallel_gc_flags() {
1607 assert(UseParallelGC || UseParallelOldGC, "Error");
1608 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1609 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1610 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1611 }
1612 FLAG_SET_DEFAULT(UseParallelGC, true);
1613
1614 // If no heap maximum was requested explicitly, use some reasonable fraction
1615 // of the physical memory, up to a maximum of 1GB.
1616 FLAG_SET_DEFAULT(ParallelGCThreads,
1617 Abstract_VM_Version::parallel_worker_threads());
1618 if (ParallelGCThreads == 0) {
1619 jio_fprintf(defaultStream::error_stream(),
1620 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1621 vm_exit(1);
1622 }
1623
1624 if (UseAdaptiveSizePolicy) {
1625 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1626 // unless the user actually sets these flags.
1627 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1628 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1629 }
1630 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1631 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1632 }
1633 }
1634
1635 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1636 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1637 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1638 // See CR 6362902 for details.
1639 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1640 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1641 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1642 }
1643 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1644 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1645 }
1646 }
1647
1648 if (UseParallelOldGC) {
1649 // Par compact uses lower default values since they are treated as
1650 // minimums. These are different defaults because of the different
1651 // interpretation and are not ergonomically set.
1652 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1653 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1654 }
1655 }
1656 }
1657
1658 void Arguments::set_g1_gc_flags() {
1659 assert(UseG1GC, "Error");
1660 #ifdef COMPILER1
1661 FastTLABRefill = false;
1662 #endif
1663 FLAG_SET_DEFAULT(ParallelGCThreads,
1664 Abstract_VM_Version::parallel_worker_threads());
1665 if (ParallelGCThreads == 0) {
1666 FLAG_SET_DEFAULT(ParallelGCThreads,
1667 Abstract_VM_Version::parallel_worker_threads());
1668 }
1669
1670 // MarkStackSize will be set (if it hasn't been set by the user)
1671 // when concurrent marking is initialized.
1672 // Its value will be based upon the number of parallel marking threads.
1673 // But we do set the maximum mark stack size here.
1674 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1675 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1676 }
1677
1678 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1679 // In G1, we want the default GC overhead goal to be higher than
1680 // say in PS. So we set it here to 10%. Otherwise the heap might
1681 // be expanded more aggressively than we would like it to. In
1682 // fact, even 10% seems to not be high enough in some cases
1683 // (especially small GC stress tests that the main thing they do
1684 // is allocation). We might consider increase it further.
1685 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1686 }
1687
1688 if (PrintGCDetails && Verbose) {
1689 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1690 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1691 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1692 }
1693 }
1694
1695 julong Arguments::limit_by_allocatable_memory(julong limit) {
1696 julong max_allocatable;
1697 julong result = limit;
1698 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1699 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1700 }
1701 return result;
1702 }
1703
1704 // Use static initialization to get the default before parsing
1705 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1706
1707 void Arguments::set_heap_size() {
1708 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1709 // Deprecated flag
1710 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1711 }
1712
1713 const julong phys_mem =
1714 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1715 : (julong)MaxRAM;
1716
1717 // If the maximum heap size has not been set with -Xmx,
1718 // then set it as fraction of the size of physical memory,
1719 // respecting the maximum and minimum sizes of the heap.
1720 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1721 julong reasonable_max = phys_mem / MaxRAMFraction;
1722
1723 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1724 // Small physical memory, so use a minimum fraction of it for the heap
1725 reasonable_max = phys_mem / MinRAMFraction;
1726 } else {
1727 // Not-small physical memory, so require a heap at least
1728 // as large as MaxHeapSize
1729 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1730 }
1731 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1732 // Limit the heap size to ErgoHeapSizeLimit
1733 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1734 }
1735 if (UseCompressedOops) {
1736 // Limit the heap size to the maximum possible when using compressed oops
1737 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1738
1739 // HeapBaseMinAddress can be greater than default but not less than.
1740 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1741 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1742 // matches compressed oops printing flags
1743 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1744 jio_fprintf(defaultStream::error_stream(),
1745 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1746 " (" UINTX_FORMAT "G) which is greater than value given "
1747 UINTX_FORMAT "\n",
1748 DefaultHeapBaseMinAddress,
1749 DefaultHeapBaseMinAddress/G,
1750 HeapBaseMinAddress);
1751 }
1752 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1753 }
1754 }
1755
1756 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1757 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1758 // but it should be not less than default MaxHeapSize.
1759 max_coop_heap -= HeapBaseMinAddress;
1760 }
1761 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1762 }
1763 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1764
1765 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1766 // An initial heap size was specified on the command line,
1767 // so be sure that the maximum size is consistent. Done
1768 // after call to limit_by_allocatable_memory because that
1769 // method might reduce the allocation size.
1770 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1771 }
1772
1773 if (PrintGCDetails && Verbose) {
1774 // Cannot use gclog_or_tty yet.
1775 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1776 }
1777 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1778 }
1779
1780 // If the minimum or initial heap_size have not been set or requested to be set
1781 // ergonomically, set them accordingly.
1782 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1783 julong reasonable_minimum = (julong)(OldSize + NewSize);
1784
1785 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1786
1787 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1788
1789 if (InitialHeapSize == 0) {
1790 julong reasonable_initial = phys_mem / InitialRAMFraction;
1791
1792 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1793 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1794
1795 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1796
1797 if (PrintGCDetails && Verbose) {
1798 // Cannot use gclog_or_tty yet.
1799 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1800 }
1801 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1802 }
1803 // If the minimum heap size has not been set (via -Xms),
1804 // synchronize with InitialHeapSize to avoid errors with the default value.
1805 if (min_heap_size() == 0) {
1806 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1807 if (PrintGCDetails && Verbose) {
1808 // Cannot use gclog_or_tty yet.
1809 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1810 }
1811 }
1812 }
1813 }
1814
1815 // This must be called after ergonomics because we want bytecode rewriting
1816 // if the server compiler is used, or if UseSharedSpaces is disabled.
1817 void Arguments::set_bytecode_flags() {
1818 // Better not attempt to store into a read-only space.
1819 if (UseSharedSpaces) {
1820 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1821 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1822 }
1823
1824 if (!RewriteBytecodes) {
1825 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1826 }
1827 }
1828
1829 // Aggressive optimization flags -XX:+AggressiveOpts
1830 void Arguments::set_aggressive_opts_flags() {
1831 #ifdef COMPILER2
1832 if (AggressiveUnboxing) {
1833 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1834 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1835 } else if (!EliminateAutoBox) {
1836 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1837 AggressiveUnboxing = false;
1838 }
1839 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1840 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1841 } else if (!DoEscapeAnalysis) {
1842 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1843 AggressiveUnboxing = false;
1844 }
1845 }
1846 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1847 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1848 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1849 }
1850 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1851 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1852 }
1853
1854 // Feed the cache size setting into the JDK
1855 char buffer[1024];
1856 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1857 add_property(buffer);
1858 }
1859 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1860 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1861 }
1862 #endif
1863
1864 if (AggressiveOpts) {
1865 // Sample flag setting code
1866 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1867 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1868 // }
1869 }
1870 }
1871
1872 //===========================================================================================================
1873 // Parsing of java.compiler property
1874
1875 void Arguments::process_java_compiler_argument(char* arg) {
1876 // For backwards compatibility, Djava.compiler=NONE or ""
1877 // causes us to switch to -Xint mode UNLESS -Xdebug
1878 // is also specified.
1879 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1880 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1881 }
1882 }
1883
1884 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1885 _sun_java_launcher = os::strdup_check_oom(launcher);
1886 }
1887
1888 bool Arguments::created_by_java_launcher() {
1889 assert(_sun_java_launcher != NULL, "property must have value");
1890 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1891 }
1892
1893 bool Arguments::sun_java_launcher_is_altjvm() {
1894 return _sun_java_launcher_is_altjvm;
1895 }
1896
1897 //===========================================================================================================
1898 // Parsing of main arguments
1899
1900 bool Arguments::verify_interval(uintx val, uintx min,
1901 uintx max, const char* name) {
1902 // Returns true iff value is in the inclusive interval [min..max]
1903 // false, otherwise.
1904 if (val >= min && val <= max) {
1905 return true;
1906 }
1907 jio_fprintf(defaultStream::error_stream(),
1908 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1909 " and " UINTX_FORMAT "\n",
1910 name, val, min, max);
1911 return false;
1912 }
1913
1914 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1915 // Returns true if given value is at least specified min threshold
1916 // false, otherwise.
1917 if (val >= min ) {
1918 return true;
1919 }
1920 jio_fprintf(defaultStream::error_stream(),
1921 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1922 name, val, min);
1923 return false;
1924 }
1925
1926 bool Arguments::verify_percentage(uintx value, const char* name) {
1927 if (is_percentage(value)) {
1928 return true;
1929 }
1930 jio_fprintf(defaultStream::error_stream(),
1931 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1932 name, value);
1933 return false;
1934 }
1935
1936 #if !INCLUDE_ALL_GCS
1937 #ifdef ASSERT
1938 static bool verify_serial_gc_flags() {
1939 return (UseSerialGC &&
1940 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1941 UseParallelGC || UseParallelOldGC));
1942 }
1943 #endif // ASSERT
1944 #endif // INCLUDE_ALL_GCS
1945
1946 // check if do gclog rotation
1947 // +UseGCLogFileRotation is a must,
1948 // no gc log rotation when log file not supplied or
1949 // NumberOfGCLogFiles is 0
1950 void check_gclog_consistency() {
1951 if (UseGCLogFileRotation) {
1952 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1953 jio_fprintf(defaultStream::output_stream(),
1954 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1955 "where num_of_file > 0\n"
1956 "GC log rotation is turned off\n");
1957 UseGCLogFileRotation = false;
1958 }
1959 }
1960
1961 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1962 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1963 jio_fprintf(defaultStream::output_stream(),
1964 "GCLogFileSize changed to minimum 8K\n");
1965 }
1966 }
1967
1968 // This function is called for -Xloggc:<filename>, it can be used
1969 // to check if a given file name(or string) conforms to the following
1970 // specification:
1971 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1972 // %p and %t only allowed once. We only limit usage of filename not path
1973 bool is_filename_valid(const char *file_name) {
1974 const char* p = file_name;
1975 char file_sep = os::file_separator()[0];
1976 const char* cp;
1977 // skip prefix path
1978 for (cp = file_name; *cp != '\0'; cp++) {
1979 if (*cp == '/' || *cp == file_sep) {
1980 p = cp + 1;
1981 }
1982 }
1983
1984 int count_p = 0;
1985 int count_t = 0;
1986 while (*p != '\0') {
1987 if ((*p >= '0' && *p <= '9') ||
1988 (*p >= 'A' && *p <= 'Z') ||
1989 (*p >= 'a' && *p <= 'z') ||
1990 *p == '-' ||
1991 *p == '_' ||
1992 *p == '.') {
1993 p++;
1994 continue;
1995 }
1996 if (*p == '%') {
1997 if(*(p + 1) == 'p') {
1998 p += 2;
1999 count_p ++;
2000 continue;
2001 }
2002 if (*(p + 1) == 't') {
2003 p += 2;
2004 count_t ++;
2005 continue;
2006 }
2007 }
2008 return false;
2009 }
2010 return count_p < 2 && count_t < 2;
2011 }
2012
2013 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2014 if (!is_percentage(min_heap_free_ratio)) {
2015 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2016 return false;
2017 }
2018 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2019 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2020 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2021 MaxHeapFreeRatio);
2022 return false;
2023 }
2024 return true;
2025 }
2026
2027 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2028 if (!is_percentage(max_heap_free_ratio)) {
2029 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2030 return false;
2031 }
2032 if (max_heap_free_ratio < MinHeapFreeRatio) {
2033 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2034 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2035 MinHeapFreeRatio);
2036 return false;
2037 }
2038 return true;
2039 }
2040
2041 // Check consistency of GC selection
2042 bool Arguments::check_gc_consistency() {
2043 check_gclog_consistency();
2044 bool status = true;
2045 // Ensure that the user has not selected conflicting sets
2046 // of collectors. [Note: this check is merely a user convenience;
2047 // collectors over-ride each other so that only a non-conflicting
2048 // set is selected; however what the user gets is not what they
2049 // may have expected from the combination they asked for. It's
2050 // better to reduce user confusion by not allowing them to
2051 // select conflicting combinations.
2052 uint i = 0;
2053 if (UseSerialGC) i++;
2054 if (UseConcMarkSweepGC || UseParNewGC) i++;
2055 if (UseParallelGC || UseParallelOldGC) i++;
2056 if (UseG1GC) i++;
2057 if (i > 1) {
2058 jio_fprintf(defaultStream::error_stream(),
2059 "Conflicting collector combinations in option list; "
2060 "please refer to the release notes for the combinations "
2061 "allowed\n");
2062 status = false;
2063 }
2064 return status;
2065 }
2066
2067 void Arguments::check_deprecated_gcs() {
2068 if (UseConcMarkSweepGC && !UseParNewGC) {
2069 warning("Using the DefNew young collector with the CMS collector is deprecated "
2070 "and will likely be removed in a future release");
2071 }
2072
2073 if (UseParNewGC && !UseConcMarkSweepGC) {
2074 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2075 // set up UseSerialGC properly, so that can't be used in the check here.
2076 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2077 "and will likely be removed in a future release");
2078 }
2079
2080 if (CMSIncrementalMode) {
2081 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2082 }
2083 }
2084
2085 void Arguments::check_deprecated_gc_flags() {
2086 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2087 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2088 "and will likely be removed in future release");
2089 }
2090 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2091 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2092 "Use MaxRAMFraction instead.");
2093 }
2094 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2095 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2096 }
2097 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2098 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2099 }
2100 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2101 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2102 }
2103 }
2104
2105 // Check stack pages settings
2106 bool Arguments::check_stack_pages()
2107 {
2108 bool status = true;
2109 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2110 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2111 // greater stack shadow pages can't generate instruction to bang stack
2112 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2113 return status;
2114 }
2115
2116 // Check the consistency of vm_init_args
2117 bool Arguments::check_vm_args_consistency() {
2118 // Method for adding checks for flag consistency.
2119 // The intent is to warn the user of all possible conflicts,
2120 // before returning an error.
2121 // Note: Needs platform-dependent factoring.
2122 bool status = true;
2123
2124 if (TLABRefillWasteFraction == 0) {
2125 jio_fprintf(defaultStream::error_stream(),
2126 "TLABRefillWasteFraction should be a denominator, "
2127 "not " SIZE_FORMAT "\n",
2128 TLABRefillWasteFraction);
2129 status = false;
2130 }
2131
2132 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2133 "AdaptiveSizePolicyWeight");
2134 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2135
2136 // Divide by bucket size to prevent a large size from causing rollover when
2137 // calculating amount of memory needed to be allocated for the String table.
2138 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2139 (max_uintx / StringTable::bucket_size()), "StringTable size");
2140
2141 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2142 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2143
2144 {
2145 // Using "else if" below to avoid printing two error messages if min > max.
2146 // This will also prevent us from reporting both min>100 and max>100 at the
2147 // same time, but that is less annoying than printing two identical errors IMHO.
2148 FormatBuffer<80> err_msg("%s","");
2149 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2150 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2151 status = false;
2152 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2153 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2154 status = false;
2155 }
2156 }
2157
2158 // Min/MaxMetaspaceFreeRatio
2159 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2160 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2161
2162 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2163 jio_fprintf(defaultStream::error_stream(),
2164 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2165 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2166 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2167 MinMetaspaceFreeRatio,
2168 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2169 MaxMetaspaceFreeRatio);
2170 status = false;
2171 }
2172
2173 // Trying to keep 100% free is not practical
2174 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2175
2176 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2177 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2178 }
2179
2180 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2181 // Settings to encourage splitting.
2182 if (!FLAG_IS_CMDLINE(NewRatio)) {
2183 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2184 }
2185 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2186 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2187 }
2188 }
2189
2190 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2191 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2192 }
2193
2194 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2195 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2196 if (GCTimeLimit == 100) {
2197 // Turn off gc-overhead-limit-exceeded checks
2198 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2199 }
2200
2201 status = status && check_gc_consistency();
2202 status = status && check_stack_pages();
2203
2204 if (CMSIncrementalMode) {
2205 if (!UseConcMarkSweepGC) {
2206 jio_fprintf(defaultStream::error_stream(),
2207 "error: invalid argument combination.\n"
2208 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2209 "selected in order\nto use CMSIncrementalMode.\n");
2210 status = false;
2211 } else {
2212 status = status && verify_percentage(CMSIncrementalDutyCycle,
2213 "CMSIncrementalDutyCycle");
2214 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2215 "CMSIncrementalDutyCycleMin");
2216 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2217 "CMSIncrementalSafetyFactor");
2218 status = status && verify_percentage(CMSIncrementalOffset,
2219 "CMSIncrementalOffset");
2220 status = status && verify_percentage(CMSExpAvgFactor,
2221 "CMSExpAvgFactor");
2222 // If it was not set on the command line, set
2223 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2224 if (CMSInitiatingOccupancyFraction < 0) {
2225 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2226 }
2227 }
2228 }
2229
2230 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2231 // insists that we hold the requisite locks so that the iteration is
2232 // MT-safe. For the verification at start-up and shut-down, we don't
2233 // yet have a good way of acquiring and releasing these locks,
2234 // which are not visible at the CollectedHeap level. We want to
2235 // be able to acquire these locks and then do the iteration rather
2236 // than just disable the lock verification. This will be fixed under
2237 // bug 4788986.
2238 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2239 if (VerifyDuringStartup) {
2240 warning("Heap verification at start-up disabled "
2241 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2242 VerifyDuringStartup = false; // Disable verification at start-up
2243 }
2244
2245 if (VerifyBeforeExit) {
2246 warning("Heap verification at shutdown disabled "
2247 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2248 VerifyBeforeExit = false; // Disable verification at shutdown
2249 }
2250 }
2251
2252 // Note: only executed in non-PRODUCT mode
2253 if (!UseAsyncConcMarkSweepGC &&
2254 (ExplicitGCInvokesConcurrent ||
2255 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2256 jio_fprintf(defaultStream::error_stream(),
2257 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2258 " with -UseAsyncConcMarkSweepGC");
2259 status = false;
2260 }
2261
2262 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2263
2264 #if INCLUDE_ALL_GCS
2265 if (UseG1GC) {
2266 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2267 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2268 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2269
2270 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2271 "InitiatingHeapOccupancyPercent");
2272 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2273 "G1RefProcDrainInterval");
2274 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2275 "G1ConcMarkStepDurationMillis");
2276 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2277 "G1ConcRSHotCardLimit");
2278 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2279 "G1ConcRSLogCacheSize");
2280 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2281 "StringDeduplicationAgeThreshold");
2282 }
2283 if (UseConcMarkSweepGC) {
2284 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2285 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2286 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2287 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2288
2289 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2290
2291 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2292 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2293 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2294
2295 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2296
2297 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2298 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2299
2300 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2301 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2302 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2303
2304 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2305
2306 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2307
2308 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2309 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2310 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2311 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2312 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2313 }
2314
2315 if (UseParallelGC || UseParallelOldGC) {
2316 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2317 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2318
2319 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2320 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2321
2322 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2323 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2324
2325 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2326
2327 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2328 }
2329 #endif // INCLUDE_ALL_GCS
2330
2331 status = status && verify_interval(RefDiscoveryPolicy,
2332 ReferenceProcessor::DiscoveryPolicyMin,
2333 ReferenceProcessor::DiscoveryPolicyMax,
2334 "RefDiscoveryPolicy");
2335
2336 // Limit the lower bound of this flag to 1 as it is used in a division
2337 // expression.
2338 status = status && verify_interval(TLABWasteTargetPercent,
2339 1, 100, "TLABWasteTargetPercent");
2340
2341 status = status && verify_object_alignment();
2342
2343 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2344 "CompressedClassSpaceSize");
2345
2346 status = status && verify_interval(MarkStackSizeMax,
2347 1, (max_jint - 1), "MarkStackSizeMax");
2348 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2349
2350 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2351
2352 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2353
2354 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2355
2356 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2357 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2358
2359 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2360
2361 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2362 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2363 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2364 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2365
2366 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2367 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2368
2369 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2370 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2371 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2372
2373 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2374 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2375
2376 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2377 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2378 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2379 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2380
2381 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2382 #ifdef COMPILER1
2383 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2384 #endif
2385
2386 if (PrintNMTStatistics) {
2387 #if INCLUDE_NMT
2388 if (MemTracker::tracking_level() == NMT_off) {
2389 #endif // INCLUDE_NMT
2390 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2391 PrintNMTStatistics = false;
2392 #if INCLUDE_NMT
2393 }
2394 #endif
2395 }
2396
2397 // Need to limit the extent of the padding to reasonable size.
2398 // 8K is well beyond the reasonable HW cache line size, even with the
2399 // aggressive prefetching, while still leaving the room for segregating
2400 // among the distinct pages.
2401 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2402 jio_fprintf(defaultStream::error_stream(),
2403 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2404 ContendedPaddingWidth, 0, 8192);
2405 status = false;
2406 }
2407
2408 // Need to enforce the padding not to break the existing field alignments.
2409 // It is sufficient to check against the largest type size.
2410 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2411 jio_fprintf(defaultStream::error_stream(),
2412 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2413 ContendedPaddingWidth, BytesPerLong);
2414 status = false;
2415 }
2416
2417 // Check lower bounds of the code cache
2418 // Template Interpreter code is approximately 3X larger in debug builds.
2419 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2420 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2423 os::vm_page_size()/K);
2424 status = false;
2425 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2426 jio_fprintf(defaultStream::error_stream(),
2427 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2428 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2429 status = false;
2430 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2431 jio_fprintf(defaultStream::error_stream(),
2432 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2433 min_code_cache_size/K);
2434 status = false;
2435 } else if (ReservedCodeCacheSize > 2*G) {
2436 // Code cache size larger than MAXINT is not supported.
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2439 (2*G)/M);
2440 status = false;
2441 }
2442
2443 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2444 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2445 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2446 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2447
2448 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2449 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2450 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2451 // Check the minimum number of compiler threads
2452 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2453
2454 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2455 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2456 }
2457
2458 status &= check_vm_args_consistency_ext();
2459
2460 return status;
2461 }
2462
2463 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2464 const char* option_type) {
2465 if (ignore) return false;
2466
2467 const char* spacer = " ";
2468 if (option_type == NULL) {
2469 option_type = ++spacer; // Set both to the empty string.
2470 }
2471
2472 if (os::obsolete_option(option)) {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "Obsolete %s%soption: %s\n", option_type, spacer,
2475 option->optionString);
2476 return false;
2477 } else {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "Unrecognized %s%soption: %s\n", option_type, spacer,
2480 option->optionString);
2481 return true;
2482 }
2483 }
2484
2485 static const char* user_assertion_options[] = {
2486 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2487 };
2488
2489 static const char* system_assertion_options[] = {
2490 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2491 };
2492
2493 // Return true if any of the strings in null-terminated array 'names' matches.
2494 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2495 // the option must match exactly.
2496 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2497 bool tail_allowed) {
2498 for (/* empty */; *names != NULL; ++names) {
2499 if (match_option(option, *names, tail)) {
2500 if (**tail == '\0' || tail_allowed && **tail == ':') {
2501 return true;
2502 }
2503 }
2504 }
2505 return false;
2506 }
2507
2508 bool Arguments::parse_uintx(const char* value,
2509 uintx* uintx_arg,
2510 uintx min_size) {
2511
2512 // Check the sign first since atomull() parses only unsigned values.
2513 bool value_is_positive = !(*value == '-');
2514
2515 if (value_is_positive) {
2516 julong n;
2517 bool good_return = atomull(value, &n);
2518 if (good_return) {
2519 bool above_minimum = n >= min_size;
2520 bool value_is_too_large = n > max_uintx;
2521
2522 if (above_minimum && !value_is_too_large) {
2523 *uintx_arg = n;
2524 return true;
2525 }
2526 }
2527 }
2528 return false;
2529 }
2530
2531 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2532 julong* long_arg,
2533 julong min_size) {
2534 if (!atomull(s, long_arg)) return arg_unreadable;
2535 return check_memory_size(*long_arg, min_size);
2536 }
2537
2538 // Parse JavaVMInitArgs structure
2539
2540 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2541 // For components of the system classpath.
2542 SysClassPath scp(Arguments::get_sysclasspath());
2543 bool scp_assembly_required = false;
2544
2545 // Save default settings for some mode flags
2546 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2547 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2548 Arguments::_ClipInlining = ClipInlining;
2549 Arguments::_BackgroundCompilation = BackgroundCompilation;
2550
2551 // Setup flags for mixed which is the default
2552 set_mode_flags(_mixed);
2553
2554 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2555 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2556 if (result != JNI_OK) {
2557 return result;
2558 }
2559
2560 // Parse JavaVMInitArgs structure passed in
2561 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2562 if (result != JNI_OK) {
2563 return result;
2564 }
2565
2566 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2567 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2568 if (result != JNI_OK) {
2569 return result;
2570 }
2571
2572 // Do final processing now that all arguments have been parsed
2573 result = finalize_vm_init_args(&scp, scp_assembly_required);
2574 if (result != JNI_OK) {
2575 return result;
2576 }
2577
2578 return JNI_OK;
2579 }
2580
2581 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2582 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2583 // are dealing with -agentpath (case where name is a path), otherwise with
2584 // -agentlib
2585 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2586 char *_name;
2587 const char *_hprof = "hprof", *_jdwp = "jdwp";
2588 size_t _len_hprof, _len_jdwp, _len_prefix;
2589
2590 if (is_path) {
2591 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2592 return false;
2593 }
2594
2595 _name++; // skip past last path separator
2596 _len_prefix = strlen(JNI_LIB_PREFIX);
2597
2598 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2599 return false;
2600 }
2601
2602 _name += _len_prefix;
2603 _len_hprof = strlen(_hprof);
2604 _len_jdwp = strlen(_jdwp);
2605
2606 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2607 _name += _len_hprof;
2608 }
2609 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2610 _name += _len_jdwp;
2611 }
2612 else {
2613 return false;
2614 }
2615
2616 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2617 return false;
2618 }
2619
2620 return true;
2621 }
2622
2623 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2624 return true;
2625 }
2626
2627 return false;
2628 }
2629
2630 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2631 SysClassPath* scp_p,
2632 bool* scp_assembly_required_p,
2633 Flag::Flags origin) {
2634 // Remaining part of option string
2635 const char* tail;
2636
2637 // iterate over arguments
2638 for (int index = 0; index < args->nOptions; index++) {
2639 bool is_absolute_path = false; // for -agentpath vs -agentlib
2640
2641 const JavaVMOption* option = args->options + index;
2642
2643 if (!match_option(option, "-Djava.class.path", &tail) &&
2644 !match_option(option, "-Dsun.java.command", &tail) &&
2645 !match_option(option, "-Dsun.java.launcher", &tail)) {
2646
2647 // add all jvm options to the jvm_args string. This string
2648 // is used later to set the java.vm.args PerfData string constant.
2649 // the -Djava.class.path and the -Dsun.java.command options are
2650 // omitted from jvm_args string as each have their own PerfData
2651 // string constant object.
2652 build_jvm_args(option->optionString);
2653 }
2654
2655 // -verbose:[class/gc/jni]
2656 if (match_option(option, "-verbose", &tail)) {
2657 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2658 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2659 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2660 } else if (!strcmp(tail, ":gc")) {
2661 FLAG_SET_CMDLINE(bool, PrintGC, true);
2662 } else if (!strcmp(tail, ":jni")) {
2663 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2664 }
2665 // -da / -ea / -disableassertions / -enableassertions
2666 // These accept an optional class/package name separated by a colon, e.g.,
2667 // -da:java.lang.Thread.
2668 } else if (match_option(option, user_assertion_options, &tail, true)) {
2669 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2670 if (*tail == '\0') {
2671 JavaAssertions::setUserClassDefault(enable);
2672 } else {
2673 assert(*tail == ':', "bogus match by match_option()");
2674 JavaAssertions::addOption(tail + 1, enable);
2675 }
2676 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2677 } else if (match_option(option, system_assertion_options, &tail, false)) {
2678 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2679 JavaAssertions::setSystemClassDefault(enable);
2680 // -bootclasspath:
2681 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2682 scp_p->reset_path(tail);
2683 *scp_assembly_required_p = true;
2684 // -bootclasspath/a:
2685 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2686 scp_p->add_suffix(tail);
2687 *scp_assembly_required_p = true;
2688 // -bootclasspath/p:
2689 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2690 scp_p->add_prefix(tail);
2691 *scp_assembly_required_p = true;
2692 // -Xrun
2693 } else if (match_option(option, "-Xrun", &tail)) {
2694 if (tail != NULL) {
2695 const char* pos = strchr(tail, ':');
2696 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2697 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2698 name[len] = '\0';
2699
2700 char *options = NULL;
2701 if(pos != NULL) {
2702 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2703 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2704 }
2705 #if !INCLUDE_JVMTI
2706 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2707 jio_fprintf(defaultStream::error_stream(),
2708 "Profiling and debugging agents are not supported in this VM\n");
2709 return JNI_ERR;
2710 }
2711 #endif // !INCLUDE_JVMTI
2712 add_init_library(name, options);
2713 }
2714 // -agentlib and -agentpath
2715 } else if (match_option(option, "-agentlib:", &tail) ||
2716 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2717 if(tail != NULL) {
2718 const char* pos = strchr(tail, '=');
2719 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2720 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2721 name[len] = '\0';
2722
2723 char *options = NULL;
2724 if(pos != NULL) {
2725 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2726 }
2727 #if !INCLUDE_JVMTI
2728 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2729 jio_fprintf(defaultStream::error_stream(),
2730 "Profiling and debugging agents are not supported in this VM\n");
2731 return JNI_ERR;
2732 }
2733 #endif // !INCLUDE_JVMTI
2734 add_init_agent(name, options, is_absolute_path);
2735 }
2736 // -javaagent
2737 } else if (match_option(option, "-javaagent:", &tail)) {
2738 #if !INCLUDE_JVMTI
2739 jio_fprintf(defaultStream::error_stream(),
2740 "Instrumentation agents are not supported in this VM\n");
2741 return JNI_ERR;
2742 #else
2743 if(tail != NULL) {
2744 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2745 add_init_agent("instrument", options, false);
2746 }
2747 #endif // !INCLUDE_JVMTI
2748 // -Xnoclassgc
2749 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2750 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2751 // -Xincgc: i-CMS
2752 } else if (match_option(option, "-Xincgc", &tail)) {
2753 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2754 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2755 // -Xnoincgc: no i-CMS
2756 } else if (match_option(option, "-Xnoincgc", &tail)) {
2757 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2758 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2759 // -Xconcgc
2760 } else if (match_option(option, "-Xconcgc", &tail)) {
2761 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2762 // -Xnoconcgc
2763 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2764 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2765 // -Xbatch
2766 } else if (match_option(option, "-Xbatch", &tail)) {
2767 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2768 // -Xmn for compatibility with other JVM vendors
2769 } else if (match_option(option, "-Xmn", &tail)) {
2770 julong long_initial_young_size = 0;
2771 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2772 if (errcode != arg_in_range) {
2773 jio_fprintf(defaultStream::error_stream(),
2774 "Invalid initial young generation size: %s\n", option->optionString);
2775 describe_range_error(errcode);
2776 return JNI_EINVAL;
2777 }
2778 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2779 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2780 // -Xms
2781 } else if (match_option(option, "-Xms", &tail)) {
2782 julong long_initial_heap_size = 0;
2783 // an initial heap size of 0 means automatically determine
2784 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2785 if (errcode != arg_in_range) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Invalid initial heap size: %s\n", option->optionString);
2788 describe_range_error(errcode);
2789 return JNI_EINVAL;
2790 }
2791 set_min_heap_size((uintx)long_initial_heap_size);
2792 // Currently the minimum size and the initial heap sizes are the same.
2793 // Can be overridden with -XX:InitialHeapSize.
2794 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2795 // -Xmx
2796 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2797 julong long_max_heap_size = 0;
2798 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2799 if (errcode != arg_in_range) {
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Invalid maximum heap size: %s\n", option->optionString);
2802 describe_range_error(errcode);
2803 return JNI_EINVAL;
2804 }
2805 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2806 // Xmaxf
2807 } else if (match_option(option, "-Xmaxf", &tail)) {
2808 char* err;
2809 int maxf = (int)(strtod(tail, &err) * 100);
2810 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "Bad max heap free percentage size: %s\n",
2813 option->optionString);
2814 return JNI_EINVAL;
2815 } else {
2816 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2817 }
2818 // Xminf
2819 } else if (match_option(option, "-Xminf", &tail)) {
2820 char* err;
2821 int minf = (int)(strtod(tail, &err) * 100);
2822 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2823 jio_fprintf(defaultStream::error_stream(),
2824 "Bad min heap free percentage size: %s\n",
2825 option->optionString);
2826 return JNI_EINVAL;
2827 } else {
2828 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2829 }
2830 // -Xss
2831 } else if (match_option(option, "-Xss", &tail)) {
2832 julong long_ThreadStackSize = 0;
2833 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2834 if (errcode != arg_in_range) {
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Invalid thread stack size: %s\n", option->optionString);
2837 describe_range_error(errcode);
2838 return JNI_EINVAL;
2839 }
2840 // Internally track ThreadStackSize in units of 1024 bytes.
2841 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2842 round_to((int)long_ThreadStackSize, K) / K);
2843 // -Xoss
2844 } else if (match_option(option, "-Xoss", &tail)) {
2845 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2846 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2847 julong long_CodeCacheExpansionSize = 0;
2848 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2849 if (errcode != arg_in_range) {
2850 jio_fprintf(defaultStream::error_stream(),
2851 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2852 os::vm_page_size()/K);
2853 return JNI_EINVAL;
2854 }
2855 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2856 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2857 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2858 julong long_ReservedCodeCacheSize = 0;
2859
2860 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2861 if (errcode != arg_in_range) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Invalid maximum code cache size: %s.\n", option->optionString);
2864 return JNI_EINVAL;
2865 }
2866 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2867 //-XX:IncreaseFirstTierCompileThresholdAt=
2868 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2869 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2870 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2873 option->optionString);
2874 return JNI_EINVAL;
2875 }
2876 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2877 // -green
2878 } else if (match_option(option, "-green", &tail)) {
2879 jio_fprintf(defaultStream::error_stream(),
2880 "Green threads support not available\n");
2881 return JNI_EINVAL;
2882 // -native
2883 } else if (match_option(option, "-native", &tail)) {
2884 // HotSpot always uses native threads, ignore silently for compatibility
2885 // -Xsqnopause
2886 } else if (match_option(option, "-Xsqnopause", &tail)) {
2887 // EVM option, ignore silently for compatibility
2888 // -Xrs
2889 } else if (match_option(option, "-Xrs", &tail)) {
2890 // Classic/EVM option, new functionality
2891 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2892 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2893 // change default internal VM signals used - lower case for back compat
2894 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2895 // -Xoptimize
2896 } else if (match_option(option, "-Xoptimize", &tail)) {
2897 // EVM option, ignore silently for compatibility
2898 // -Xprof
2899 } else if (match_option(option, "-Xprof", &tail)) {
2900 #if INCLUDE_FPROF
2901 _has_profile = true;
2902 #else // INCLUDE_FPROF
2903 jio_fprintf(defaultStream::error_stream(),
2904 "Flat profiling is not supported in this VM.\n");
2905 return JNI_ERR;
2906 #endif // INCLUDE_FPROF
2907 // -Xconcurrentio
2908 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2909 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2910 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2911 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2912 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2913 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2914
2915 // -Xinternalversion
2916 } else if (match_option(option, "-Xinternalversion", &tail)) {
2917 jio_fprintf(defaultStream::output_stream(), "%s\n",
2918 VM_Version::internal_vm_info_string());
2919 vm_exit(0);
2920 #ifndef PRODUCT
2921 // -Xprintflags
2922 } else if (match_option(option, "-Xprintflags", &tail)) {
2923 CommandLineFlags::printFlags(tty, false);
2924 vm_exit(0);
2925 #endif
2926 // -D
2927 } else if (match_option(option, "-D", &tail)) {
2928 if (!add_property(tail)) {
2929 return JNI_ENOMEM;
2930 }
2931 // Out of the box management support
2932 if (match_option(option, "-Dcom.sun.management", &tail)) {
2933 #if INCLUDE_MANAGEMENT
2934 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2935 #else
2936 jio_fprintf(defaultStream::output_stream(),
2937 "-Dcom.sun.management is not supported in this VM.\n");
2938 return JNI_ERR;
2939 #endif
2940 }
2941 // -Xint
2942 } else if (match_option(option, "-Xint", &tail)) {
2943 set_mode_flags(_int);
2944 // -Xmixed
2945 } else if (match_option(option, "-Xmixed", &tail)) {
2946 set_mode_flags(_mixed);
2947 // -Xcomp
2948 } else if (match_option(option, "-Xcomp", &tail)) {
2949 // for testing the compiler; turn off all flags that inhibit compilation
2950 set_mode_flags(_comp);
2951 // -Xshare:dump
2952 } else if (match_option(option, "-Xshare:dump", &tail)) {
2953 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2954 set_mode_flags(_int); // Prevent compilation, which creates objects
2955 // -Xshare:on
2956 } else if (match_option(option, "-Xshare:on", &tail)) {
2957 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2958 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2959 // -Xshare:auto
2960 } else if (match_option(option, "-Xshare:auto", &tail)) {
2961 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2962 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2963 // -Xshare:off
2964 } else if (match_option(option, "-Xshare:off", &tail)) {
2965 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2966 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2967 // -Xverify
2968 } else if (match_option(option, "-Xverify", &tail)) {
2969 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2970 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2971 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2972 } else if (strcmp(tail, ":remote") == 0) {
2973 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2974 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2975 } else if (strcmp(tail, ":none") == 0) {
2976 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2977 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2978 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2979 return JNI_EINVAL;
2980 }
2981 // -Xdebug
2982 } else if (match_option(option, "-Xdebug", &tail)) {
2983 // note this flag has been used, then ignore
2984 set_xdebug_mode(true);
2985 // -Xnoagent
2986 } else if (match_option(option, "-Xnoagent", &tail)) {
2987 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2988 } else if (match_option(option, "-Xboundthreads", &tail)) {
2989 // Bind user level threads to kernel threads (Solaris only)
2990 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2991 } else if (match_option(option, "-Xloggc:", &tail)) {
2992 // Redirect GC output to the file. -Xloggc:<filename>
2993 // ostream_init_log(), when called will use this filename
2994 // to initialize a fileStream.
2995 _gc_log_filename = os::strdup_check_oom(tail);
2996 if (!is_filename_valid(_gc_log_filename)) {
2997 jio_fprintf(defaultStream::output_stream(),
2998 "Invalid file name for use with -Xloggc: Filename can only contain the "
2999 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3000 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3001 return JNI_EINVAL;
3002 }
3003 FLAG_SET_CMDLINE(bool, PrintGC, true);
3004 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3005
3006 // JNI hooks
3007 } else if (match_option(option, "-Xcheck", &tail)) {
3008 if (!strcmp(tail, ":jni")) {
3009 #if !INCLUDE_JNI_CHECK
3010 warning("JNI CHECKING is not supported in this VM");
3011 #else
3012 CheckJNICalls = true;
3013 #endif // INCLUDE_JNI_CHECK
3014 } else if (is_bad_option(option, args->ignoreUnrecognized,
3015 "check")) {
3016 return JNI_EINVAL;
3017 }
3018 } else if (match_option(option, "vfprintf", &tail)) {
3019 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3020 } else if (match_option(option, "exit", &tail)) {
3021 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3022 } else if (match_option(option, "abort", &tail)) {
3023 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3024 // -XX:+AggressiveHeap
3025 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3026
3027 // This option inspects the machine and attempts to set various
3028 // parameters to be optimal for long-running, memory allocation
3029 // intensive jobs. It is intended for machines with large
3030 // amounts of cpu and memory.
3031
3032 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3033 // VM, but we may not be able to represent the total physical memory
3034 // available (like having 8gb of memory on a box but using a 32bit VM).
3035 // Thus, we need to make sure we're using a julong for intermediate
3036 // calculations.
3037 julong initHeapSize;
3038 julong total_memory = os::physical_memory();
3039
3040 if (total_memory < (julong)256*M) {
3041 jio_fprintf(defaultStream::error_stream(),
3042 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3043 vm_exit(1);
3044 }
3045
3046 // The heap size is half of available memory, or (at most)
3047 // all of possible memory less 160mb (leaving room for the OS
3048 // when using ISM). This is the maximum; because adaptive sizing
3049 // is turned on below, the actual space used may be smaller.
3050
3051 initHeapSize = MIN2(total_memory / (julong)2,
3052 total_memory - (julong)160*M);
3053
3054 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3055
3056 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3057 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3058 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3059 // Currently the minimum size and the initial heap sizes are the same.
3060 set_min_heap_size(initHeapSize);
3061 }
3062 if (FLAG_IS_DEFAULT(NewSize)) {
3063 // Make the young generation 3/8ths of the total heap.
3064 FLAG_SET_CMDLINE(uintx, NewSize,
3065 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3066 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3067 }
3068
3069 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3070 FLAG_SET_DEFAULT(UseLargePages, true);
3071 #endif
3072
3073 // Increase some data structure sizes for efficiency
3074 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3075 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3076 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3077
3078 // See the OldPLABSize comment below, but replace 'after promotion'
3079 // with 'after copying'. YoungPLABSize is the size of the survivor
3080 // space per-gc-thread buffers. The default is 4kw.
3081 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3082
3083 // OldPLABSize is the size of the buffers in the old gen that
3084 // UseParallelGC uses to promote live data that doesn't fit in the
3085 // survivor spaces. At any given time, there's one for each gc thread.
3086 // The default size is 1kw. These buffers are rarely used, since the
3087 // survivor spaces are usually big enough. For specjbb, however, there
3088 // are occasions when there's lots of live data in the young gen
3089 // and we end up promoting some of it. We don't have a definite
3090 // explanation for why bumping OldPLABSize helps, but the theory
3091 // is that a bigger PLAB results in retaining something like the
3092 // original allocation order after promotion, which improves mutator
3093 // locality. A minor effect may be that larger PLABs reduce the
3094 // number of PLAB allocation events during gc. The value of 8kw
3095 // was arrived at by experimenting with specjbb.
3096 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3097
3098 // Enable parallel GC and adaptive generation sizing
3099 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3100 FLAG_SET_DEFAULT(ParallelGCThreads,
3101 Abstract_VM_Version::parallel_worker_threads());
3102
3103 // Encourage steady state memory management
3104 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3105
3106 // This appears to improve mutator locality
3107 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3108
3109 // Get around early Solaris scheduling bug
3110 // (affinity vs other jobs on system)
3111 // but disallow DR and offlining (5008695).
3112 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3113
3114 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3115 // and the last option wins.
3116 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3117 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3118 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3119 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3120 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3121 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3122 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3123 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3124 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3125 uintx max_tenuring_thresh = 0;
3126 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3127 jio_fprintf(defaultStream::error_stream(),
3128 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3129 }
3130 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3131
3132 if (MaxTenuringThreshold == 0) {
3133 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3134 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3135 } else {
3136 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3137 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3138 }
3139 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3140 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3141 jio_fprintf(defaultStream::error_stream(),
3142 "Please use CMSClassUnloadingEnabled in place of "
3143 "CMSPermGenSweepingEnabled in the future\n");
3144 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3145 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3146 jio_fprintf(defaultStream::error_stream(),
3147 "Please use -XX:+UseGCOverheadLimit in place of "
3148 "-XX:+UseGCTimeLimit in the future\n");
3149 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3150 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3151 jio_fprintf(defaultStream::error_stream(),
3152 "Please use -XX:-UseGCOverheadLimit in place of "
3153 "-XX:-UseGCTimeLimit in the future\n");
3154 // The TLE options are for compatibility with 1.3 and will be
3155 // removed without notice in a future release. These options
3156 // are not to be documented.
3157 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3158 // No longer used.
3159 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3160 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3161 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3162 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3163 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3164 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3165 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3166 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3167 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3168 // No longer used.
3169 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3170 julong long_tlab_size = 0;
3171 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3172 if (errcode != arg_in_range) {
3173 jio_fprintf(defaultStream::error_stream(),
3174 "Invalid TLAB size: %s\n", option->optionString);
3175 describe_range_error(errcode);
3176 return JNI_EINVAL;
3177 }
3178 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3179 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3180 // No longer used.
3181 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3182 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3183 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3184 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3185 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3186 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3187 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3188 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3189 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3190 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3191 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3192 #if defined(DTRACE_ENABLED)
3193 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3194 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3195 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3196 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3197 #else // defined(DTRACE_ENABLED)
3198 jio_fprintf(defaultStream::error_stream(),
3199 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3200 return JNI_EINVAL;
3201 #endif // defined(DTRACE_ENABLED)
3202 #ifdef ASSERT
3203 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3204 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3205 // disable scavenge before parallel mark-compact
3206 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3207 #endif
3208 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3209 julong cms_blocks_to_claim = (julong)atol(tail);
3210 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3211 jio_fprintf(defaultStream::error_stream(),
3212 "Please use -XX:OldPLABSize in place of "
3213 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3214 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3215 julong cms_blocks_to_claim = (julong)atol(tail);
3216 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3217 jio_fprintf(defaultStream::error_stream(),
3218 "Please use -XX:OldPLABSize in place of "
3219 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3220 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3221 julong old_plab_size = 0;
3222 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3223 if (errcode != arg_in_range) {
3224 jio_fprintf(defaultStream::error_stream(),
3225 "Invalid old PLAB size: %s\n", option->optionString);
3226 describe_range_error(errcode);
3227 return JNI_EINVAL;
3228 }
3229 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3230 jio_fprintf(defaultStream::error_stream(),
3231 "Please use -XX:OldPLABSize in place of "
3232 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3233 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3234 julong young_plab_size = 0;
3235 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3236 if (errcode != arg_in_range) {
3237 jio_fprintf(defaultStream::error_stream(),
3238 "Invalid young PLAB size: %s\n", option->optionString);
3239 describe_range_error(errcode);
3240 return JNI_EINVAL;
3241 }
3242 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3243 jio_fprintf(defaultStream::error_stream(),
3244 "Please use -XX:YoungPLABSize in place of "
3245 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3246 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3247 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3248 julong stack_size = 0;
3249 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3250 if (errcode != arg_in_range) {
3251 jio_fprintf(defaultStream::error_stream(),
3252 "Invalid mark stack size: %s\n", option->optionString);
3253 describe_range_error(errcode);
3254 return JNI_EINVAL;
3255 }
3256 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3257 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3258 julong max_stack_size = 0;
3259 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3260 if (errcode != arg_in_range) {
3261 jio_fprintf(defaultStream::error_stream(),
3262 "Invalid maximum mark stack size: %s\n",
3263 option->optionString);
3264 describe_range_error(errcode);
3265 return JNI_EINVAL;
3266 }
3267 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3268 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3269 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3270 uintx conc_threads = 0;
3271 if (!parse_uintx(tail, &conc_threads, 1)) {
3272 jio_fprintf(defaultStream::error_stream(),
3273 "Invalid concurrent threads: %s\n", option->optionString);
3274 return JNI_EINVAL;
3275 }
3276 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3277 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3278 julong max_direct_memory_size = 0;
3279 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3280 if (errcode != arg_in_range) {
3281 jio_fprintf(defaultStream::error_stream(),
3282 "Invalid maximum direct memory size: %s\n",
3283 option->optionString);
3284 describe_range_error(errcode);
3285 return JNI_EINVAL;
3286 }
3287 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3288 #if !INCLUDE_MANAGEMENT
3289 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3290 jio_fprintf(defaultStream::error_stream(),
3291 "ManagementServer is not supported in this VM.\n");
3292 return JNI_ERR;
3293 #endif // INCLUDE_MANAGEMENT
3294 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3295 // Skip -XX:Flags= since that case has already been handled
3296 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3297 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3298 return JNI_EINVAL;
3299 }
3300 }
3301 // Unknown option
3302 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3303 return JNI_ERR;
3304 }
3305 }
3306
3307 // PrintSharedArchiveAndExit will turn on
3308 // -Xshare:on
3309 // -XX:+TraceClassPaths
3310 if (PrintSharedArchiveAndExit) {
3311 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3312 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3313 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3314 }
3315
3316 // Change the default value for flags which have different default values
3317 // when working with older JDKs.
3318 #ifdef LINUX
3319 if (JDK_Version::current().compare_major(6) <= 0 &&
3320 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3321 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3322 }
3323 #endif // LINUX
3324 fix_appclasspath();
3325 return JNI_OK;
3326 }
3327
3328 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3329 //
3330 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3331 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3332 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3333 // path is treated as the current directory.
3334 //
3335 // This causes problems with CDS, which requires that all directories specified in the classpath
3336 // must be empty. In most cases, applications do NOT want to load classes from the current
3337 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3338 // scripts compatible with CDS.
3339 void Arguments::fix_appclasspath() {
3340 if (IgnoreEmptyClassPaths) {
3341 const char separator = *os::path_separator();
3342 const char* src = _java_class_path->value();
3343
3344 // skip over all the leading empty paths
3345 while (*src == separator) {
3346 src ++;
3347 }
3348
3349 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3350 strncpy(copy, src, strlen(src) + 1);
3351
3352 // trim all trailing empty paths
3353 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3354 *tail = '\0';
3355 }
3356
3357 char from[3] = {separator, separator, '\0'};
3358 char to [2] = {separator, '\0'};
3359 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3360 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3361 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3362 }
3363
3364 _java_class_path->set_value(copy);
3365 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3366 }
3367
3368 if (!PrintSharedArchiveAndExit) {
3369 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3370 }
3371 }
3372
3373 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3374 // This must be done after all -D arguments have been processed.
3375 scp_p->expand_endorsed();
3376
3377 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3378 // Assemble the bootclasspath elements into the final path.
3379 Arguments::set_sysclasspath(scp_p->combined_path());
3380 }
3381
3382 // This must be done after all arguments have been processed.
3383 // java_compiler() true means set to "NONE" or empty.
3384 if (java_compiler() && !xdebug_mode()) {
3385 // For backwards compatibility, we switch to interpreted mode if
3386 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3387 // not specified.
3388 set_mode_flags(_int);
3389 }
3390 if (CompileThreshold == 0) {
3391 set_mode_flags(_int);
3392 }
3393
3394 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3395 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3396 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3397 }
3398
3399 #ifndef COMPILER2
3400 // Don't degrade server performance for footprint
3401 if (FLAG_IS_DEFAULT(UseLargePages) &&
3402 MaxHeapSize < LargePageHeapSizeThreshold) {
3403 // No need for large granularity pages w/small heaps.
3404 // Note that large pages are enabled/disabled for both the
3405 // Java heap and the code cache.
3406 FLAG_SET_DEFAULT(UseLargePages, false);
3407 }
3408
3409 #else
3410 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3411 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3412 }
3413 #endif
3414
3415 #ifndef TIERED
3416 // Tiered compilation is undefined.
3417 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3418 #endif
3419
3420 // If we are running in a headless jre, force java.awt.headless property
3421 // to be true unless the property has already been set.
3422 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3423 if (os::is_headless_jre()) {
3424 const char* headless = Arguments::get_property("java.awt.headless");
3425 if (headless == NULL) {
3426 char envbuffer[128];
3427 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3428 if (!add_property("java.awt.headless=true")) {
3429 return JNI_ENOMEM;
3430 }
3431 } else {
3432 char buffer[256];
3433 strcpy(buffer, "java.awt.headless=");
3434 strcat(buffer, envbuffer);
3435 if (!add_property(buffer)) {
3436 return JNI_ENOMEM;
3437 }
3438 }
3439 }
3440 }
3441
3442 if (!check_vm_args_consistency()) {
3443 return JNI_ERR;
3444 }
3445
3446 return JNI_OK;
3447 }
3448
3449 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3450 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3451 scp_assembly_required_p);
3452 }
3453
3454 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3455 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3456 scp_assembly_required_p);
3457 }
3458
3459 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3460 const int N_MAX_OPTIONS = 64;
3461 const int OPTION_BUFFER_SIZE = 1024;
3462 char buffer[OPTION_BUFFER_SIZE];
3463
3464 // The variable will be ignored if it exceeds the length of the buffer.
3465 // Don't check this variable if user has special privileges
3466 // (e.g. unix su command).
3467 if (os::getenv(name, buffer, sizeof(buffer)) &&
3468 !os::have_special_privileges()) {
3469 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3470 jio_fprintf(defaultStream::error_stream(),
3471 "Picked up %s: %s\n", name, buffer);
3472 char* rd = buffer; // pointer to the input string (rd)
3473 int i;
3474 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3475 while (isspace(*rd)) rd++; // skip whitespace
3476 if (*rd == 0) break; // we re done when the input string is read completely
3477
3478 // The output, option string, overwrites the input string.
3479 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3480 // input string (rd).
3481 char* wrt = rd;
3482
3483 options[i++].optionString = wrt; // Fill in option
3484 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3485 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3486 int quote = *rd; // matching quote to look for
3487 rd++; // don't copy open quote
3488 while (*rd != quote) { // include everything (even spaces) up until quote
3489 if (*rd == 0) { // string termination means unmatched string
3490 jio_fprintf(defaultStream::error_stream(),
3491 "Unmatched quote in %s\n", name);
3492 return JNI_ERR;
3493 }
3494 *wrt++ = *rd++; // copy to option string
3495 }
3496 rd++; // don't copy close quote
3497 } else {
3498 *wrt++ = *rd++; // copy to option string
3499 }
3500 }
3501 // Need to check if we're done before writing a NULL,
3502 // because the write could be to the byte that rd is pointing to.
3503 if (*rd++ == 0) {
3504 *wrt = 0;
3505 break;
3506 }
3507 *wrt = 0; // Zero terminate option
3508 }
3509 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3510 JavaVMInitArgs vm_args;
3511 vm_args.version = JNI_VERSION_1_2;
3512 vm_args.options = options;
3513 vm_args.nOptions = i;
3514 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3515
3516 if (PrintVMOptions) {
3517 const char* tail;
3518 for (int i = 0; i < vm_args.nOptions; i++) {
3519 const JavaVMOption *option = vm_args.options + i;
3520 if (match_option(option, "-XX:", &tail)) {
3521 logOption(tail);
3522 }
3523 }
3524 }
3525
3526 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3527 }
3528 return JNI_OK;
3529 }
3530
3531 void Arguments::set_shared_spaces_flags() {
3532 if (DumpSharedSpaces) {
3533 if (RequireSharedSpaces) {
3534 warning("cannot dump shared archive while using shared archive");
3535 }
3536 UseSharedSpaces = false;
3537 #ifdef _LP64
3538 if (!UseCompressedOops || !UseCompressedClassPointers) {
3539 vm_exit_during_initialization(
3540 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3541 }
3542 } else {
3543 if (!UseCompressedOops || !UseCompressedClassPointers) {
3544 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3545 }
3546 #endif
3547 }
3548 }
3549
3550 #if !INCLUDE_ALL_GCS
3551 static void force_serial_gc() {
3552 FLAG_SET_DEFAULT(UseSerialGC, true);
3553 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3554 UNSUPPORTED_GC_OPTION(UseG1GC);
3555 UNSUPPORTED_GC_OPTION(UseParallelGC);
3556 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3557 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3558 UNSUPPORTED_GC_OPTION(UseParNewGC);
3559 }
3560 #endif // INCLUDE_ALL_GCS
3561
3562 // Sharing support
3563 // Construct the path to the archive
3564 static char* get_shared_archive_path() {
3565 char *shared_archive_path;
3566 if (SharedArchiveFile == NULL) {
3567 char jvm_path[JVM_MAXPATHLEN];
3568 os::jvm_path(jvm_path, sizeof(jvm_path));
3569 char *end = strrchr(jvm_path, *os::file_separator());
3570 if (end != NULL) *end = '\0';
3571 size_t jvm_path_len = strlen(jvm_path);
3572 size_t file_sep_len = strlen(os::file_separator());
3573 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3574 file_sep_len + 20, mtInternal);
3575 if (shared_archive_path != NULL) {
3576 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3577 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3578 strncat(shared_archive_path, "classes.jsa", 11);
3579 }
3580 } else {
3581 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3582 if (shared_archive_path != NULL) {
3583 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3584 }
3585 }
3586 return shared_archive_path;
3587 }
3588
3589 #ifndef PRODUCT
3590 // Determine whether LogVMOutput should be implicitly turned on.
3591 static bool use_vm_log() {
3592 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3593 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3594 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3595 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3596 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3597 return true;
3598 }
3599
3600 #ifdef COMPILER1
3601 if (PrintC1Statistics) {
3602 return true;
3603 }
3604 #endif // COMPILER1
3605
3606 #ifdef COMPILER2
3607 if (PrintOptoAssembly || PrintOptoStatistics) {
3608 return true;
3609 }
3610 #endif // COMPILER2
3611
3612 return false;
3613 }
3614 #endif // PRODUCT
3615
3616 // Parse entry point called from JNI_CreateJavaVM
3617
3618 jint Arguments::parse(const JavaVMInitArgs* args) {
3619
3620 // Remaining part of option string
3621 const char* tail;
3622
3623 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3624 const char* hotspotrc = ".hotspotrc";
3625 bool settings_file_specified = false;
3626 bool needs_hotspotrc_warning = false;
3627
3628 const char* flags_file;
3629 int index;
3630 for (index = 0; index < args->nOptions; index++) {
3631 const JavaVMOption *option = args->options + index;
3632 if (match_option(option, "-XX:Flags=", &tail)) {
3633 flags_file = tail;
3634 settings_file_specified = true;
3635 }
3636 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3637 PrintVMOptions = true;
3638 }
3639 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3640 PrintVMOptions = false;
3641 }
3642 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3643 IgnoreUnrecognizedVMOptions = true;
3644 }
3645 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3646 IgnoreUnrecognizedVMOptions = false;
3647 }
3648 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3649 CommandLineFlags::printFlags(tty, false);
3650 vm_exit(0);
3651 }
3652 #if INCLUDE_NMT
3653 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3654 // The launcher did not setup nmt environment variable properly.
3655 // if (!MemTracker::check_launcher_nmt_support(tail)) {
3656 // warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3657 // }
3658
3659 // Verify if nmt option is valid.
3660 if (MemTracker::verify_nmt_option()) {
3661 // Late initialization, still in single-threaded mode.
3662 if (MemTracker::tracking_level() >= NMT_summary) {
3663 MemTracker::init();
3664 }
3665 } else {
3666 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3667 }
3668 }
3669 #endif
3670
3671
3672 #ifndef PRODUCT
3673 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3674 CommandLineFlags::printFlags(tty, true);
3675 vm_exit(0);
3676 }
3677 #endif
3678 }
3679
3680 if (IgnoreUnrecognizedVMOptions) {
3681 // uncast const to modify the flag args->ignoreUnrecognized
3682 *(jboolean*)(&args->ignoreUnrecognized) = true;
3683 }
3684
3685 // Parse specified settings file
3686 if (settings_file_specified) {
3687 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3688 return JNI_EINVAL;
3689 }
3690 } else {
3691 #ifdef ASSERT
3692 // Parse default .hotspotrc settings file
3693 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3694 return JNI_EINVAL;
3695 }
3696 #else
3697 struct stat buf;
3698 if (os::stat(hotspotrc, &buf) == 0) {
3699 needs_hotspotrc_warning = true;
3700 }
3701 #endif
3702 }
3703
3704 if (PrintVMOptions) {
3705 for (index = 0; index < args->nOptions; index++) {
3706 const JavaVMOption *option = args->options + index;
3707 if (match_option(option, "-XX:", &tail)) {
3708 logOption(tail);
3709 }
3710 }
3711 }
3712
3713 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3714 jint result = parse_vm_init_args(args);
3715 if (result != JNI_OK) {
3716 return result;
3717 }
3718
3719 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3720 SharedArchivePath = get_shared_archive_path();
3721 if (SharedArchivePath == NULL) {
3722 return JNI_ENOMEM;
3723 }
3724
3725 // Delay warning until here so that we've had a chance to process
3726 // the -XX:-PrintWarnings flag
3727 if (needs_hotspotrc_warning) {
3728 warning("%s file is present but has been ignored. "
3729 "Run with -XX:Flags=%s to load the file.",
3730 hotspotrc, hotspotrc);
3731 }
3732
3733 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3734 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3735 #endif
3736
3737 #if INCLUDE_ALL_GCS
3738 #if (defined JAVASE_EMBEDDED || defined ARM)
3739 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3740 #endif
3741 #endif
3742
3743 #ifndef PRODUCT
3744 if (TraceBytecodesAt != 0) {
3745 TraceBytecodes = true;
3746 }
3747 if (CountCompiledCalls) {
3748 if (UseCounterDecay) {
3749 warning("UseCounterDecay disabled because CountCalls is set");
3750 UseCounterDecay = false;
3751 }
3752 }
3753 #endif // PRODUCT
3754
3755 if (ScavengeRootsInCode == 0) {
3756 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3757 warning("forcing ScavengeRootsInCode non-zero");
3758 }
3759 ScavengeRootsInCode = 1;
3760 }
3761
3762 if (PrintGCDetails) {
3763 // Turn on -verbose:gc options as well
3764 PrintGC = true;
3765 }
3766
3767 // Set object alignment values.
3768 set_object_alignment();
3769
3770 #if !INCLUDE_ALL_GCS
3771 force_serial_gc();
3772 #endif // INCLUDE_ALL_GCS
3773 #if !INCLUDE_CDS
3774 if (DumpSharedSpaces || RequireSharedSpaces) {
3775 jio_fprintf(defaultStream::error_stream(),
3776 "Shared spaces are not supported in this VM\n");
3777 return JNI_ERR;
3778 }
3779 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3780 warning("Shared spaces are not supported in this VM");
3781 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3782 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3783 }
3784 no_shared_spaces("CDS Disabled");
3785 #endif // INCLUDE_CDS
3786
3787 return JNI_OK;
3788 }
3789
3790 jint Arguments::apply_ergo() {
3791
3792 // Set flags based on ergonomics.
3793 set_ergonomics_flags();
3794
3795 set_shared_spaces_flags();
3796
3797 // Check the GC selections again.
3798 if (!check_gc_consistency()) {
3799 return JNI_EINVAL;
3800 }
3801
3802 if (TieredCompilation) {
3803 set_tiered_flags();
3804 } else {
3805 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3806 if (CompilationPolicyChoice >= 2) {
3807 vm_exit_during_initialization(
3808 "Incompatible compilation policy selected", NULL);
3809 }
3810 }
3811 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3812 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3813 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3814 }
3815
3816
3817 // Set heap size based on available physical memory
3818 set_heap_size();
3819
3820 #if INCLUDE_ALL_GCS
3821 // Set per-collector flags
3822 if (UseParallelGC || UseParallelOldGC) {
3823 set_parallel_gc_flags();
3824 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3825 set_cms_and_parnew_gc_flags();
3826 } else if (UseParNewGC) { // Skipped if CMS is set above
3827 set_parnew_gc_flags();
3828 } else if (UseG1GC) {
3829 set_g1_gc_flags();
3830 }
3831 check_deprecated_gcs();
3832 check_deprecated_gc_flags();
3833 if (AssumeMP && !UseSerialGC) {
3834 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3835 warning("If the number of processors is expected to increase from one, then"
3836 " you should configure the number of parallel GC threads appropriately"
3837 " using -XX:ParallelGCThreads=N");
3838 }
3839 }
3840 if (MinHeapFreeRatio == 100) {
3841 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3842 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3843 }
3844 #else // INCLUDE_ALL_GCS
3845 assert(verify_serial_gc_flags(), "SerialGC unset");
3846 #endif // INCLUDE_ALL_GCS
3847
3848 // Initialize Metaspace flags and alignments
3849 Metaspace::ergo_initialize();
3850
3851 // Set bytecode rewriting flags
3852 set_bytecode_flags();
3853
3854 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3855 set_aggressive_opts_flags();
3856
3857 // Turn off biased locking for locking debug mode flags,
3858 // which are subtly different from each other but neither works with
3859 // biased locking
3860 if (UseHeavyMonitors
3861 #ifdef COMPILER1
3862 || !UseFastLocking
3863 #endif // COMPILER1
3864 ) {
3865 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3866 // flag set to true on command line; warn the user that they
3867 // can't enable biased locking here
3868 warning("Biased Locking is not supported with locking debug flags"
3869 "; ignoring UseBiasedLocking flag." );
3870 }
3871 UseBiasedLocking = false;
3872 }
3873
3874 #ifdef ZERO
3875 // Clear flags not supported on zero.
3876 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3877 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3878 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3879 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3880 #endif // CC_INTERP
3881
3882 #ifdef COMPILER2
3883 if (!EliminateLocks) {
3884 EliminateNestedLocks = false;
3885 }
3886 if (!Inline) {
3887 IncrementalInline = false;
3888 }
3889 #ifndef PRODUCT
3890 if (!IncrementalInline) {
3891 AlwaysIncrementalInline = false;
3892 }
3893 #endif
3894 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3895 // nothing to use the profiling, turn if off
3896 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3897 }
3898 #endif
3899
3900 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3901 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3902 DebugNonSafepoints = true;
3903 }
3904
3905 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3906 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3907 }
3908
3909 #ifndef PRODUCT
3910 if (CompileTheWorld) {
3911 // Force NmethodSweeper to sweep whole CodeCache each time.
3912 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3913 NmethodSweepFraction = 1;
3914 }
3915 }
3916
3917 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3918 if (use_vm_log()) {
3919 LogVMOutput = true;
3920 }
3921 }
3922 #endif // PRODUCT
3923
3924 if (PrintCommandLineFlags) {
3925 CommandLineFlags::printSetFlags(tty);
3926 }
3927
3928 // Apply CPU specific policy for the BiasedLocking
3929 if (UseBiasedLocking) {
3930 if (!VM_Version::use_biased_locking() &&
3931 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3932 UseBiasedLocking = false;
3933 }
3934 }
3935 #ifdef COMPILER2
3936 if (!UseBiasedLocking || EmitSync != 0) {
3937 UseOptoBiasInlining = false;
3938 }
3939 #endif
3940
3941 return JNI_OK;
3942 }
3943
3944 jint Arguments::adjust_after_os() {
3945 if (UseNUMA) {
3946 if (UseParallelGC || UseParallelOldGC) {
3947 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3948 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3949 }
3950 }
3951 // UseNUMAInterleaving is set to ON for all collectors and
3952 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3953 // such as the parallel collector for Linux and Solaris will
3954 // interleave old gen and survivor spaces on top of NUMA
3955 // allocation policy for the eden space.
3956 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3957 // all platforms and ParallelGC on Windows will interleave all
3958 // of the heap spaces across NUMA nodes.
3959 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3960 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3961 }
3962 }
3963 return JNI_OK;
3964 }
3965
3966 int Arguments::PropertyList_count(SystemProperty* pl) {
3967 int count = 0;
3968 while(pl != NULL) {
3969 count++;
3970 pl = pl->next();
3971 }
3972 return count;
3973 }
3974
3975 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3976 assert(key != NULL, "just checking");
3977 SystemProperty* prop;
3978 for (prop = pl; prop != NULL; prop = prop->next()) {
3979 if (strcmp(key, prop->key()) == 0) return prop->value();
3980 }
3981 return NULL;
3982 }
3983
3984 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3985 int count = 0;
3986 const char* ret_val = NULL;
3987
3988 while(pl != NULL) {
3989 if(count >= index) {
3990 ret_val = pl->key();
3991 break;
3992 }
3993 count++;
3994 pl = pl->next();
3995 }
3996
3997 return ret_val;
3998 }
3999
4000 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4001 int count = 0;
4002 char* ret_val = NULL;
4003
4004 while(pl != NULL) {
4005 if(count >= index) {
4006 ret_val = pl->value();
4007 break;
4008 }
4009 count++;
4010 pl = pl->next();
4011 }
4012
4013 return ret_val;
4014 }
4015
4016 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4017 SystemProperty* p = *plist;
4018 if (p == NULL) {
4019 *plist = new_p;
4020 } else {
4021 while (p->next() != NULL) {
4022 p = p->next();
4023 }
4024 p->set_next(new_p);
4025 }
4026 }
4027
4028 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4029 if (plist == NULL)
4030 return;
4031
4032 SystemProperty* new_p = new SystemProperty(k, v, true);
4033 PropertyList_add(plist, new_p);
4034 }
4035
4036 // This add maintains unique property key in the list.
4037 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4038 if (plist == NULL)
4039 return;
4040
4041 // If property key exist then update with new value.
4042 SystemProperty* prop;
4043 for (prop = *plist; prop != NULL; prop = prop->next()) {
4044 if (strcmp(k, prop->key()) == 0) {
4045 if (append) {
4046 prop->append_value(v);
4047 } else {
4048 prop->set_value(v);
4049 }
4050 return;
4051 }
4052 }
4053
4054 PropertyList_add(plist, k, v);
4055 }
4056
4057 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4058 // Returns true if all of the source pointed by src has been copied over to
4059 // the destination buffer pointed by buf. Otherwise, returns false.
4060 // Notes:
4061 // 1. If the length (buflen) of the destination buffer excluding the
4062 // NULL terminator character is not long enough for holding the expanded
4063 // pid characters, it also returns false instead of returning the partially
4064 // expanded one.
4065 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4066 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4067 char* buf, size_t buflen) {
4068 const char* p = src;
4069 char* b = buf;
4070 const char* src_end = &src[srclen];
4071 char* buf_end = &buf[buflen - 1];
4072
4073 while (p < src_end && b < buf_end) {
4074 if (*p == '%') {
4075 switch (*(++p)) {
4076 case '%': // "%%" ==> "%"
4077 *b++ = *p++;
4078 break;
4079 case 'p': { // "%p" ==> current process id
4080 // buf_end points to the character before the last character so
4081 // that we could write '\0' to the end of the buffer.
4082 size_t buf_sz = buf_end - b + 1;
4083 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4084
4085 // if jio_snprintf fails or the buffer is not long enough to hold
4086 // the expanded pid, returns false.
4087 if (ret < 0 || ret >= (int)buf_sz) {
4088 return false;
4089 } else {
4090 b += ret;
4091 assert(*b == '\0', "fail in copy_expand_pid");
4092 if (p == src_end && b == buf_end + 1) {
4093 // reach the end of the buffer.
4094 return true;
4095 }
4096 }
4097 p++;
4098 break;
4099 }
4100 default :
4101 *b++ = '%';
4102 }
4103 } else {
4104 *b++ = *p++;
4105 }
4106 }
4107 *b = '\0';
4108 return (p == src_end); // return false if not all of the source was copied
4109 }