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