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 "compiler/compilerOracle.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/referenceProcessor.hpp"
31 #include "memory/universe.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/jvmtiExport.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/globals_extension.hpp"
36 #include "runtime/java.hpp"
37 #include "services/management.hpp"
38 #include "services/memTracker.hpp"
39 #include "utilities/defaultStream.hpp"
40 #include "utilities/taskqueue.hpp"
41 #ifdef TARGET_OS_FAMILY_linux
42 # include "os_linux.inline.hpp"
43 #endif
44 #ifdef TARGET_OS_FAMILY_solaris
45 # include "os_solaris.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_windows
48 # include "os_windows.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_bsd
51 # include "os_bsd.inline.hpp"
52 #endif
53 #ifndef SERIALGC
54 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
55 #endif
56
57 // Note: This is a special bug reporting site for the JVM
58 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
59 #define DEFAULT_JAVA_LAUNCHER "generic"
60
61 char** Arguments::_jvm_flags_array = NULL;
62 int Arguments::_num_jvm_flags = 0;
63 char** Arguments::_jvm_args_array = NULL;
64 int Arguments::_num_jvm_args = 0;
65 char* Arguments::_java_command = NULL;
66 SystemProperty* Arguments::_system_properties = NULL;
67 const char* Arguments::_gc_log_filename = NULL;
68 bool Arguments::_has_profile = false;
69 bool Arguments::_has_alloc_profile = false;
70 uintx Arguments::_min_heap_size = 0;
71 Arguments::Mode Arguments::_mode = _mixed;
72 bool Arguments::_java_compiler = false;
73 bool Arguments::_xdebug_mode = false;
74 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
75 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
76 int Arguments::_sun_java_launcher_pid = -1;
77 bool Arguments::_created_by_gamma_launcher = false;
78
79 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
80 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
81 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
82 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
83 bool Arguments::_ClipInlining = ClipInlining;
84
85 char* Arguments::SharedArchivePath = NULL;
86
87 AgentLibraryList Arguments::_libraryList;
88 AgentLibraryList Arguments::_agentList;
89
90 abort_hook_t Arguments::_abort_hook = NULL;
91 exit_hook_t Arguments::_exit_hook = NULL;
92 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
93
94
95 SystemProperty *Arguments::_java_ext_dirs = NULL;
96 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
97 SystemProperty *Arguments::_sun_boot_library_path = NULL;
98 SystemProperty *Arguments::_java_library_path = NULL;
99 SystemProperty *Arguments::_java_home = NULL;
100 SystemProperty *Arguments::_java_class_path = NULL;
101 SystemProperty *Arguments::_sun_boot_class_path = NULL;
102
103 char* Arguments::_meta_index_path = NULL;
104 char* Arguments::_meta_index_dir = NULL;
105
106 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
107
108 static bool match_option(const JavaVMOption *option, const char* name,
109 const char** tail) {
110 int len = (int)strlen(name);
111 if (strncmp(option->optionString, name, len) == 0) {
112 *tail = option->optionString + len;
113 return true;
114 } else {
115 return false;
116 }
117 }
118
119 static void logOption(const char* opt) {
120 if (PrintVMOptions) {
121 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
122 }
123 }
124
125 // Process java launcher properties.
126 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
127 // See if sun.java.launcher or sun.java.launcher.pid is defined.
128 // Must do this before setting up other system properties,
129 // as some of them may depend on launcher type.
130 for (int index = 0; index < args->nOptions; index++) {
131 const JavaVMOption* option = args->options + index;
132 const char* tail;
133
134 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
135 process_java_launcher_argument(tail, option->extraInfo);
136 continue;
137 }
138 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
139 _sun_java_launcher_pid = atoi(tail);
140 continue;
141 }
142 }
143 }
144
145 // Initialize system properties key and value.
146 void Arguments::init_system_properties() {
147
148 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
149 "Java Virtual Machine Specification", false));
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
153
154 // following are JVMTI agent writeable properties.
155 // Properties values are set to NULL and they are
156 // os specific they are initialized in os::init_system_properties_values().
157 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
158 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
159 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
160 _java_library_path = new SystemProperty("java.library.path", NULL, true);
161 _java_home = new SystemProperty("java.home", NULL, true);
162 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
163
164 _java_class_path = new SystemProperty("java.class.path", "", true);
165
166 // Add to System Property list.
167 PropertyList_add(&_system_properties, _java_ext_dirs);
168 PropertyList_add(&_system_properties, _java_endorsed_dirs);
169 PropertyList_add(&_system_properties, _sun_boot_library_path);
170 PropertyList_add(&_system_properties, _java_library_path);
171 PropertyList_add(&_system_properties, _java_home);
172 PropertyList_add(&_system_properties, _java_class_path);
173 PropertyList_add(&_system_properties, _sun_boot_class_path);
174
175 // Set OS specific system properties values
176 os::init_system_properties_values();
177 }
178
179
180 // Update/Initialize System properties after JDK version number is known
181 void Arguments::init_version_specific_system_properties() {
182 enum { bufsz = 16 };
183 char buffer[bufsz];
184 const char* spec_vendor = "Sun Microsystems Inc.";
185 uint32_t spec_version = 0;
186
187 if (JDK_Version::is_gte_jdk17x_version()) {
188 spec_vendor = "Oracle Corporation";
189 spec_version = JDK_Version::current().major_version();
190 }
191 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
192
193 PropertyList_add(&_system_properties,
194 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.version", buffer, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
199 }
200
201 /**
202 * Provide a slightly more user-friendly way of eliminating -XX flags.
203 * When a flag is eliminated, it can be added to this list in order to
204 * continue accepting this flag on the command-line, while issuing a warning
205 * and ignoring the value. Once the JDK version reaches the 'accept_until'
206 * limit, we flatly refuse to admit the existence of the flag. This allows
207 * a flag to die correctly over JDK releases using HSX.
208 */
209 typedef struct {
210 const char* name;
211 JDK_Version obsoleted_in; // when the flag went away
212 JDK_Version accept_until; // which version to start denying the existence
213 } ObsoleteFlag;
214
215 static ObsoleteFlag obsolete_jvm_flags[] = {
216 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
217 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
230 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
231 { "DefaultInitialRAMFraction",
232 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "UseDepthFirstScavengeOrder",
234 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
235 { "HandlePromotionFailure",
236 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
237 { "MaxLiveObjectEvacuationRatio",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
240 { "UseParallelOldGCCompacting",
241 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
242 { "UseParallelDensePrefixUpdate",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelOldGCDensePrefix",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
247 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "AlwaysInflate", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
249 { "AnonymousClasses", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
250 { "CMSOldPLABReactivityCeiling",
251 JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
252 { "EventLogLength", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
253 { "GCOverheadReporting", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
254 { "GCOverheadReportingPeriodMS",
255 JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
256 { "HPILibPath", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
257 { "PreSpinYield", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
258 { "PreBlockSpin", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
259 { "PostSpinYield", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
260 { "PreserveMarkStackSize",
261 JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
262 { "ReadSpinIterations", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
263 { "StressTieredRuntime", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
264 { "Tier1Inline", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
265 { "Tier1FreqInlineSize", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
266 { "Tier1MaxInlineSize", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
267 { "Tier1LoopOptsCount", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
268 { "UseSpinning", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
269 { "CompilationRepeat", JDK_Version::jdk_update(7,80), JDK_Version::jdk(9) },
270 #ifdef PRODUCT
271 { "DesiredMethodLimit",
272 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
273 #endif // PRODUCT
274 { NULL, JDK_Version(0), JDK_Version(0) }
275 };
276
277 // Returns true if the flag is obsolete and fits into the range specified
278 // for being ignored. In the case that the flag is ignored, the 'version'
279 // value is filled in with the version number when the flag became
280 // obsolete so that that value can be displayed to the user.
281 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
282 int i = 0;
283 assert(version != NULL, "Must provide a version buffer");
284 while (obsolete_jvm_flags[i].name != NULL) {
285 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
286 // <flag>=xxx form
287 // [-|+]<flag> form
288 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
289 ((s[0] == '+' || s[0] == '-') &&
290 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
291 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
292 *version = flag_status.obsoleted_in;
293 return true;
294 }
295 }
296 i++;
297 }
298 return false;
299 }
300
301 // Constructs the system class path (aka boot class path) from the following
302 // components, in order:
303 //
304 // prefix // from -Xbootclasspath/p:...
305 // endorsed // the expansion of -Djava.endorsed.dirs=...
306 // base // from os::get_system_properties() or -Xbootclasspath=
307 // suffix // from -Xbootclasspath/a:...
308 //
309 // java.endorsed.dirs is a list of directories; any jar or zip files in the
310 // directories are added to the sysclasspath just before the base.
311 //
312 // This could be AllStatic, but it isn't needed after argument processing is
313 // complete.
314 class SysClassPath: public StackObj {
315 public:
316 SysClassPath(const char* base);
317 ~SysClassPath();
318
319 inline void set_base(const char* base);
320 inline void add_prefix(const char* prefix);
321 inline void add_suffix_to_prefix(const char* suffix);
322 inline void add_suffix(const char* suffix);
323 inline void reset_path(const char* base);
324
325 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
326 // property. Must be called after all command-line arguments have been
327 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
328 // combined_path().
329 void expand_endorsed();
330
331 inline const char* get_base() const { return _items[_scp_base]; }
332 inline const char* get_prefix() const { return _items[_scp_prefix]; }
333 inline const char* get_suffix() const { return _items[_scp_suffix]; }
334 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
335
336 // Combine all the components into a single c-heap-allocated string; caller
337 // must free the string if/when no longer needed.
338 char* combined_path();
339
340 private:
341 // Utility routines.
342 static char* add_to_path(const char* path, const char* str, bool prepend);
343 static char* add_jars_to_path(char* path, const char* directory);
344
345 inline void reset_item_at(int index);
346
347 // Array indices for the items that make up the sysclasspath. All except the
348 // base are allocated in the C heap and freed by this class.
349 enum {
350 _scp_prefix, // from -Xbootclasspath/p:...
351 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
352 _scp_base, // the default sysclasspath
353 _scp_suffix, // from -Xbootclasspath/a:...
354 _scp_nitems // the number of items, must be last.
355 };
356
357 const char* _items[_scp_nitems];
358 DEBUG_ONLY(bool _expansion_done;)
359 };
360
361 SysClassPath::SysClassPath(const char* base) {
362 memset(_items, 0, sizeof(_items));
363 _items[_scp_base] = base;
364 DEBUG_ONLY(_expansion_done = false;)
365 }
366
367 SysClassPath::~SysClassPath() {
368 // Free everything except the base.
369 for (int i = 0; i < _scp_nitems; ++i) {
370 if (i != _scp_base) reset_item_at(i);
371 }
372 DEBUG_ONLY(_expansion_done = false;)
373 }
374
375 inline void SysClassPath::set_base(const char* base) {
376 _items[_scp_base] = base;
377 }
378
379 inline void SysClassPath::add_prefix(const char* prefix) {
380 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
381 }
382
383 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
384 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
385 }
386
387 inline void SysClassPath::add_suffix(const char* suffix) {
388 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
389 }
390
391 inline void SysClassPath::reset_item_at(int index) {
392 assert(index < _scp_nitems && index != _scp_base, "just checking");
393 if (_items[index] != NULL) {
394 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
395 _items[index] = NULL;
396 }
397 }
398
399 inline void SysClassPath::reset_path(const char* base) {
400 // Clear the prefix and suffix.
401 reset_item_at(_scp_prefix);
402 reset_item_at(_scp_suffix);
403 set_base(base);
404 }
405
406 //------------------------------------------------------------------------------
407
408 void SysClassPath::expand_endorsed() {
409 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
410
411 const char* path = Arguments::get_property("java.endorsed.dirs");
412 if (path == NULL) {
413 path = Arguments::get_endorsed_dir();
414 assert(path != NULL, "no default for java.endorsed.dirs");
415 }
416
417 char* expanded_path = NULL;
418 const char separator = *os::path_separator();
419 const char* const end = path + strlen(path);
420 while (path < end) {
421 const char* tmp_end = strchr(path, separator);
422 if (tmp_end == NULL) {
423 expanded_path = add_jars_to_path(expanded_path, path);
424 path = end;
425 } else {
426 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
427 memcpy(dirpath, path, tmp_end - path);
428 dirpath[tmp_end - path] = '\0';
429 expanded_path = add_jars_to_path(expanded_path, dirpath);
430 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
431 path = tmp_end + 1;
432 }
433 }
434 _items[_scp_endorsed] = expanded_path;
435 DEBUG_ONLY(_expansion_done = true;)
436 }
437
438 // Combine the bootclasspath elements, some of which may be null, into a single
439 // c-heap-allocated string.
440 char* SysClassPath::combined_path() {
441 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
442 assert(_expansion_done, "must call expand_endorsed() first.");
443
444 size_t lengths[_scp_nitems];
445 size_t total_len = 0;
446
447 const char separator = *os::path_separator();
448
449 // Get the lengths.
450 int i;
451 for (i = 0; i < _scp_nitems; ++i) {
452 if (_items[i] != NULL) {
453 lengths[i] = strlen(_items[i]);
454 // Include space for the separator char (or a NULL for the last item).
455 total_len += lengths[i] + 1;
456 }
457 }
458 assert(total_len > 0, "empty sysclasspath not allowed");
459
460 // Copy the _items to a single string.
461 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
462 char* cp_tmp = cp;
463 for (i = 0; i < _scp_nitems; ++i) {
464 if (_items[i] != NULL) {
465 memcpy(cp_tmp, _items[i], lengths[i]);
466 cp_tmp += lengths[i];
467 *cp_tmp++ = separator;
468 }
469 }
470 *--cp_tmp = '\0'; // Replace the extra separator.
471 return cp;
472 }
473
474 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
475 char*
476 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
477 char *cp;
478
479 assert(str != NULL, "just checking");
480 if (path == NULL) {
481 size_t len = strlen(str) + 1;
482 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
483 memcpy(cp, str, len); // copy the trailing null
484 } else {
485 const char separator = *os::path_separator();
486 size_t old_len = strlen(path);
487 size_t str_len = strlen(str);
488 size_t len = old_len + str_len + 2;
489
490 if (prepend) {
491 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
492 char* cp_tmp = cp;
493 memcpy(cp_tmp, str, str_len);
494 cp_tmp += str_len;
495 *cp_tmp = separator;
496 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
497 FREE_C_HEAP_ARRAY(char, path, mtInternal);
498 } else {
499 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
500 char* cp_tmp = cp + old_len;
501 *cp_tmp = separator;
502 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
503 }
504 }
505 return cp;
506 }
507
508 // Scan the directory and append any jar or zip files found to path.
509 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
510 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
511 DIR* dir = os::opendir(directory);
512 if (dir == NULL) return path;
513
514 char dir_sep[2] = { '\0', '\0' };
515 size_t directory_len = strlen(directory);
516 const char fileSep = *os::file_separator();
517 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
518
519 /* Scan the directory for jars/zips, appending them to path. */
520 struct dirent *entry;
521 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
522 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
523 const char* name = entry->d_name;
524 const char* ext = name + strlen(name) - 4;
525 bool isJarOrZip = ext > name &&
526 (os::file_name_strcmp(ext, ".jar") == 0 ||
527 os::file_name_strcmp(ext, ".zip") == 0);
528 if (isJarOrZip) {
529 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
530 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
531 path = add_to_path(path, jarpath, false);
532 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
533 }
534 }
535 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
536 os::closedir(dir);
537 return path;
538 }
539
540 // Parses a memory size specification string.
541 static bool atomull(const char *s, julong* result) {
542 julong n = 0;
543 int args_read = sscanf(s, os::julong_format_specifier(), &n);
544 if (args_read != 1) {
545 return false;
546 }
547 while (*s != '\0' && isdigit(*s)) {
548 s++;
549 }
550 // 4705540: illegal if more characters are found after the first non-digit
551 if (strlen(s) > 1) {
552 return false;
553 }
554 switch (*s) {
555 case 'T': case 't':
556 *result = n * G * K;
557 // Check for overflow.
558 if (*result/((julong)G * K) != n) return false;
559 return true;
560 case 'G': case 'g':
561 *result = n * G;
562 if (*result/G != n) return false;
563 return true;
564 case 'M': case 'm':
565 *result = n * M;
566 if (*result/M != n) return false;
567 return true;
568 case 'K': case 'k':
569 *result = n * K;
570 if (*result/K != n) return false;
571 return true;
572 case '\0':
573 *result = n;
574 return true;
575 default:
576 return false;
577 }
578 }
579
580 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
581 if (size < min_size) return arg_too_small;
582 // Check that size will fit in a size_t (only relevant on 32-bit)
583 if (size > max_uintx) return arg_too_big;
584 return arg_in_range;
585 }
586
587 // Describe an argument out of range error
588 void Arguments::describe_range_error(ArgsRange errcode) {
589 switch(errcode) {
590 case arg_too_big:
591 jio_fprintf(defaultStream::error_stream(),
592 "The specified size exceeds the maximum "
593 "representable size.\n");
594 break;
595 case arg_too_small:
596 case arg_unreadable:
597 case arg_in_range:
598 // do nothing for now
599 break;
600 default:
601 ShouldNotReachHere();
602 }
603 }
604
605 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
606 return CommandLineFlags::boolAtPut(name, &value, origin);
607 }
608
609 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
610 double v;
611 if (sscanf(value, "%lf", &v) != 1) {
612 return false;
613 }
614
615 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
616 return true;
617 }
618 return false;
619 }
620
621 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
622 julong v;
623 intx intx_v;
624 bool is_neg = false;
625 // Check the sign first since atomull() parses only unsigned values.
626 if (*value == '-') {
627 if (!CommandLineFlags::intxAt(name, &intx_v)) {
628 return false;
629 }
630 value++;
631 is_neg = true;
632 }
633 if (!atomull(value, &v)) {
634 return false;
635 }
636 intx_v = (intx) v;
637 if (is_neg) {
638 intx_v = -intx_v;
639 }
640 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
641 return true;
642 }
643 uintx uintx_v = (uintx) v;
644 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
645 return true;
646 }
647 uint64_t uint64_t_v = (uint64_t) v;
648 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
649 return true;
650 }
651 return false;
652 }
653
654 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
655 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
656 // Contract: CommandLineFlags always returns a pointer that needs freeing.
657 FREE_C_HEAP_ARRAY(char, value, mtInternal);
658 return true;
659 }
660
661 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
662 const char* old_value = "";
663 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
664 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
665 size_t new_len = strlen(new_value);
666 const char* value;
667 char* free_this_too = NULL;
668 if (old_len == 0) {
669 value = new_value;
670 } else if (new_len == 0) {
671 value = old_value;
672 } else {
673 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
674 // each new setting adds another LINE to the switch:
675 sprintf(buf, "%s\n%s", old_value, new_value);
676 value = buf;
677 free_this_too = buf;
678 }
679 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
680 // CommandLineFlags always returns a pointer that needs freeing.
681 FREE_C_HEAP_ARRAY(char, value, mtInternal);
682 if (free_this_too != NULL) {
683 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
684 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
685 }
686 return true;
687 }
688
689 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
690
691 // range of acceptable characters spelled out for portability reasons
692 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
693 #define BUFLEN 255
694 char name[BUFLEN+1];
695 char dummy;
696
697 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
698 return set_bool_flag(name, false, origin);
699 }
700 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
701 return set_bool_flag(name, true, origin);
702 }
703
704 char punct;
705 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
706 const char* value = strchr(arg, '=') + 1;
707 Flag* flag = Flag::find_flag(name, strlen(name));
708 if (flag != NULL && flag->is_ccstr()) {
709 if (flag->ccstr_accumulates()) {
710 return append_to_string_flag(name, value, origin);
711 } else {
712 if (value[0] == '\0') {
713 value = NULL;
714 }
715 return set_string_flag(name, value, origin);
716 }
717 }
718 }
719
720 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
721 const char* value = strchr(arg, '=') + 1;
722 // -XX:Foo:=xxx will reset the string flag to the given value.
723 if (value[0] == '\0') {
724 value = NULL;
725 }
726 return set_string_flag(name, value, origin);
727 }
728
729 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
730 #define SIGNED_NUMBER_RANGE "[-0123456789]"
731 #define NUMBER_RANGE "[0123456789]"
732 char value[BUFLEN + 1];
733 char value2[BUFLEN + 1];
734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
735 // Looks like a floating-point number -- try again with more lenient format string
736 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
737 return set_fp_numeric_flag(name, value, origin);
738 }
739 }
740
741 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
742 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
743 return set_numeric_flag(name, value, origin);
744 }
745
746 return false;
747 }
748
749 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
750 assert(bldarray != NULL, "illegal argument");
751
752 if (arg == NULL) {
753 return;
754 }
755
756 int index = *count;
757
758 // expand the array and add arg to the last element
759 (*count)++;
760 if (*bldarray == NULL) {
761 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
762 } else {
763 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
764 }
765 (*bldarray)[index] = strdup(arg);
766 }
767
768 void Arguments::build_jvm_args(const char* arg) {
769 add_string(&_jvm_args_array, &_num_jvm_args, arg);
770 }
771
772 void Arguments::build_jvm_flags(const char* arg) {
773 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
774 }
775
776 // utility function to return a string that concatenates all
777 // strings in a given char** array
778 const char* Arguments::build_resource_string(char** args, int count) {
779 if (args == NULL || count == 0) {
780 return NULL;
781 }
782 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
783 for (int i = 1; i < count; i++) {
784 length += strlen(args[i]) + 1; // add 1 for a space
785 }
786 char* s = NEW_RESOURCE_ARRAY(char, length);
787 strcpy(s, args[0]);
788 for (int j = 1; j < count; j++) {
789 strcat(s, " ");
790 strcat(s, args[j]);
791 }
792 return (const char*) s;
793 }
794
795 void Arguments::print_on(outputStream* st) {
796 st->print_cr("VM Arguments:");
797 if (num_jvm_flags() > 0) {
798 st->print("jvm_flags: "); print_jvm_flags_on(st);
799 }
800 if (num_jvm_args() > 0) {
801 st->print("jvm_args: "); print_jvm_args_on(st);
802 }
803 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
804 st->print_cr("Launcher Type: %s", _sun_java_launcher);
805 }
806
807 void Arguments::print_jvm_flags_on(outputStream* st) {
808 if (_num_jvm_flags > 0) {
809 for (int i=0; i < _num_jvm_flags; i++) {
810 st->print("%s ", _jvm_flags_array[i]);
811 }
812 st->print_cr("");
813 }
814 }
815
816 void Arguments::print_jvm_args_on(outputStream* st) {
817 if (_num_jvm_args > 0) {
818 for (int i=0; i < _num_jvm_args; i++) {
819 st->print("%s ", _jvm_args_array[i]);
820 }
821 st->print_cr("");
822 }
823 }
824
825 bool Arguments::process_argument(const char* arg,
826 jboolean ignore_unrecognized, FlagValueOrigin origin) {
827
828 JDK_Version since = JDK_Version();
829
830 if (parse_argument(arg, origin) || ignore_unrecognized) {
831 return true;
832 }
833
834 bool has_plus_minus = (*arg == '+' || *arg == '-');
835 const char* const argname = has_plus_minus ? arg + 1 : arg;
836 if (is_newly_obsolete(arg, &since)) {
837 char version[256];
838 since.to_string(version, sizeof(version));
839 warning("ignoring option %s; support was removed in %s", argname, version);
840 return true;
841 }
842
843 // For locked flags, report a custom error message if available.
844 // Otherwise, report a standard VM option message.
845
846 size_t arg_len;
847 const char* equal_sign = strchr(argname, '=');
848 if (equal_sign == NULL) {
849 arg_len = strlen(argname);
850 } else {
851 arg_len = equal_sign - argname;
852 }
853
854 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true);
855 if (found_flag != NULL) {
856 char locked_message_buf[BUFLEN];
857 found_flag->get_locked_message(locked_message_buf, BUFLEN);
858 if (strlen(locked_message_buf) == 0) {
859 if (found_flag->is_bool() && !has_plus_minus) {
860 jio_fprintf(defaultStream::error_stream(),
861 "Missing +/- setting for VM option '%s'\n", argname);
862 } else if (!found_flag->is_bool() && has_plus_minus) {
863 jio_fprintf(defaultStream::error_stream(),
864 "Unexpected +/- setting in VM option '%s'\n", argname);
865 } else {
866 jio_fprintf(defaultStream::error_stream(),
867 "Improperly specified VM option '%s'\n", argname);
868 }
869 } else {
870 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
871 }
872 } else {
873 jio_fprintf(defaultStream::error_stream(),
874 "Unrecognized VM option '%s'\n", argname);
875 }
876
877 // allow for commandline "commenting out" options like -XX:#+Verbose
878 return arg[0] == '#';
879 }
880
881 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
882 FILE* stream = fopen(file_name, "rb");
883 if (stream == NULL) {
884 if (should_exist) {
885 jio_fprintf(defaultStream::error_stream(),
886 "Could not open settings file %s\n", file_name);
887 return false;
888 } else {
889 return true;
890 }
891 }
892
893 char token[1024];
894 int pos = 0;
895
896 bool in_white_space = true;
897 bool in_comment = false;
898 bool in_quote = false;
899 char quote_c = 0;
900 bool result = true;
901
902 int c = getc(stream);
903 while(c != EOF && pos < (int)(sizeof(token)-1)) {
904 if (in_white_space) {
905 if (in_comment) {
906 if (c == '\n') in_comment = false;
907 } else {
908 if (c == '#') in_comment = true;
909 else if (!isspace(c)) {
910 in_white_space = false;
911 token[pos++] = c;
912 }
913 }
914 } else {
915 if (c == '\n' || (!in_quote && isspace(c))) {
916 // token ends at newline, or at unquoted whitespace
917 // this allows a way to include spaces in string-valued options
918 token[pos] = '\0';
919 logOption(token);
920 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
921 build_jvm_flags(token);
922 pos = 0;
923 in_white_space = true;
924 in_quote = false;
925 } else if (!in_quote && (c == '\'' || c == '"')) {
926 in_quote = true;
927 quote_c = c;
928 } else if (in_quote && (c == quote_c)) {
929 in_quote = false;
930 } else {
931 token[pos++] = c;
932 }
933 }
934 c = getc(stream);
935 }
936 if (pos > 0) {
937 token[pos] = '\0';
938 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
939 build_jvm_flags(token);
940 }
941 fclose(stream);
942 return result;
943 }
944
945 //=============================================================================================================
946 // Parsing of properties (-D)
947
948 const char* Arguments::get_property(const char* key) {
949 return PropertyList_get_value(system_properties(), key);
950 }
951
952 bool Arguments::add_property(const char* prop) {
953 const char* eq = strchr(prop, '=');
954 char* key;
955 // ns must be static--its address may be stored in a SystemProperty object.
956 const static char ns[1] = {0};
957 char* value = (char *)ns;
958
959 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
960 key = AllocateHeap(key_len + 1, mtInternal);
961 strncpy(key, prop, key_len);
962 key[key_len] = '\0';
963
964 if (eq != NULL) {
965 size_t value_len = strlen(prop) - key_len - 1;
966 value = AllocateHeap(value_len + 1, mtInternal);
967 strncpy(value, &prop[key_len + 1], value_len + 1);
968 }
969
970 if (strcmp(key, "java.compiler") == 0) {
971 process_java_compiler_argument(value);
972 FreeHeap(key);
973 if (eq != NULL) {
974 FreeHeap(value);
975 }
976 return true;
977 } else if (strcmp(key, "sun.java.command") == 0) {
978 _java_command = value;
979
980 // Record value in Arguments, but let it get passed to Java.
981 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
982 // launcher.pid property is private and is processed
983 // in process_sun_java_launcher_properties();
984 // the sun.java.launcher property is passed on to the java application
985 FreeHeap(key);
986 if (eq != NULL) {
987 FreeHeap(value);
988 }
989 return true;
990 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
991 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
992 // its value without going through the property list or making a Java call.
993 _java_vendor_url_bug = value;
994 } else if (strcmp(key, "sun.boot.library.path") == 0) {
995 PropertyList_unique_add(&_system_properties, key, value, true);
996 return true;
997 }
998 // Create new property and add at the end of the list
999 PropertyList_unique_add(&_system_properties, key, value);
1000 return true;
1001 }
1002
1003 //===========================================================================================================
1004 // Setting int/mixed/comp mode flags
1005
1006 void Arguments::set_mode_flags(Mode mode) {
1007 // Set up default values for all flags.
1008 // If you add a flag to any of the branches below,
1009 // add a default value for it here.
1010 set_java_compiler(false);
1011 _mode = mode;
1012
1013 // Ensure Agent_OnLoad has the correct initial values.
1014 // This may not be the final mode; mode may change later in onload phase.
1015 PropertyList_unique_add(&_system_properties, "java.vm.info",
1016 (char*)VM_Version::vm_info_string(), false);
1017
1018 UseInterpreter = true;
1019 UseCompiler = true;
1020 UseLoopCounter = true;
1021
1022 #ifndef ZERO
1023 // Turn these off for mixed and comp. Leave them on for Zero.
1024 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1025 UseFastAccessorMethods = (mode == _int);
1026 }
1027 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1028 UseFastEmptyMethods = (mode == _int);
1029 }
1030 #endif
1031
1032 // Default values may be platform/compiler dependent -
1033 // use the saved values
1034 ClipInlining = Arguments::_ClipInlining;
1035 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1036 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1037 BackgroundCompilation = Arguments::_BackgroundCompilation;
1038
1039 // Change from defaults based on mode
1040 switch (mode) {
1041 default:
1042 ShouldNotReachHere();
1043 break;
1044 case _int:
1045 UseCompiler = false;
1046 UseLoopCounter = false;
1047 AlwaysCompileLoopMethods = false;
1048 UseOnStackReplacement = false;
1049 break;
1050 case _mixed:
1051 // same as default
1052 break;
1053 case _comp:
1054 UseInterpreter = false;
1055 BackgroundCompilation = false;
1056 ClipInlining = false;
1057 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1058 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1059 // compile a level 4 (C2) and then continue executing it.
1060 if (TieredCompilation) {
1061 Tier3InvokeNotifyFreqLog = 0;
1062 Tier4InvocationThreshold = 0;
1063 }
1064 break;
1065 }
1066 }
1067
1068 // Conflict: required to use shared spaces (-Xshare:on), but
1069 // incompatible command line options were chosen.
1070
1071 static void no_shared_spaces() {
1072 if (RequireSharedSpaces) {
1073 jio_fprintf(defaultStream::error_stream(),
1074 "Class data sharing is inconsistent with other specified options.\n");
1075 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1076 } else {
1077 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1078 }
1079 }
1080
1081 void Arguments::set_tiered_flags() {
1082 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1083 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1084 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1085 }
1086 if (CompilationPolicyChoice < 2) {
1087 vm_exit_during_initialization(
1088 "Incompatible compilation policy selected", NULL);
1089 }
1090 // Increase the code cache size - tiered compiles a lot more.
1091 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1092 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1093 }
1094 }
1095
1096 static void disable_adaptive_size_policy(const char* collector_name) {
1097 if (UseAdaptiveSizePolicy) {
1098 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1099 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1100 collector_name);
1101 }
1102 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1103 }
1104 }
1105
1106 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1107 // if it's not explictly set or unset. If the user has chosen
1108 // UseParNewGC and not explicitly set ParallelGCThreads we
1109 // set it, unless this is a single cpu machine.
1110 void Arguments::set_parnew_gc_flags() {
1111 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1112 "control point invariant");
1113 assert(UseParNewGC, "Error");
1114
1115 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1116 disable_adaptive_size_policy("UseParNewGC");
1117
1118 if (ParallelGCThreads == 0) {
1119 FLAG_SET_DEFAULT(ParallelGCThreads,
1120 Abstract_VM_Version::parallel_worker_threads());
1121 if (ParallelGCThreads == 1) {
1122 FLAG_SET_DEFAULT(UseParNewGC, false);
1123 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1124 }
1125 }
1126 if (UseParNewGC) {
1127 // CDS doesn't work with ParNew yet
1128 no_shared_spaces();
1129
1130 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1131 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1132 // we set them to 1024 and 1024.
1133 // See CR 6362902.
1134 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1135 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1136 }
1137 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1138 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1139 }
1140
1141 // AlwaysTenure flag should make ParNew promote all at first collection.
1142 // See CR 6362902.
1143 if (AlwaysTenure) {
1144 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1145 }
1146 // When using compressed oops, we use local overflow stacks,
1147 // rather than using a global overflow list chained through
1148 // the klass word of the object's pre-image.
1149 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1150 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1151 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1152 }
1153 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1154 }
1155 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1156 }
1157 }
1158
1159 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1160 // sparc/solaris for certain applications, but would gain from
1161 // further optimization and tuning efforts, and would almost
1162 // certainly gain from analysis of platform and environment.
1163 void Arguments::set_cms_and_parnew_gc_flags() {
1164 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1165 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1166
1167 // If we are using CMS, we prefer to UseParNewGC,
1168 // unless explicitly forbidden.
1169 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1170 FLAG_SET_ERGO(bool, UseParNewGC, true);
1171 }
1172
1173 // Turn off AdaptiveSizePolicy for CMS until it is complete.
1174 disable_adaptive_size_policy("UseConcMarkSweepGC");
1175
1176 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1177 // as needed.
1178 if (UseParNewGC) {
1179 set_parnew_gc_flags();
1180 }
1181
1182 size_t max_heap = align_size_down(MaxHeapSize,
1183 CardTableRS::ct_max_alignment_constraint());
1184
1185 // Now make adjustments for CMS
1186 intx tenuring_default = (intx)6;
1187 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1188
1189 // Preferred young gen size for "short" pauses:
1190 // upper bound depends on # of threads and NewRatio.
1191 const uintx parallel_gc_threads =
1192 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1193 const size_t preferred_max_new_size_unaligned =
1194 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1195 size_t preferred_max_new_size =
1196 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1197
1198 // Unless explicitly requested otherwise, size young gen
1199 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1200
1201 // If either MaxNewSize or NewRatio is set on the command line,
1202 // assume the user is trying to set the size of the young gen.
1203 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1204
1205 // Set MaxNewSize to our calculated preferred_max_new_size unless
1206 // NewSize was set on the command line and it is larger than
1207 // preferred_max_new_size.
1208 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1209 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1210 } else {
1211 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1212 }
1213 if (PrintGCDetails && Verbose) {
1214 // Too early to use gclog_or_tty
1215 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1216 }
1217
1218 // Code along this path potentially sets NewSize and OldSize
1219 if (PrintGCDetails && Verbose) {
1220 // Too early to use gclog_or_tty
1221 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1222 " initial_heap_size: " SIZE_FORMAT
1223 " max_heap: " SIZE_FORMAT,
1224 min_heap_size(), InitialHeapSize, max_heap);
1225 }
1226 size_t min_new = preferred_max_new_size;
1227 if (FLAG_IS_CMDLINE(NewSize)) {
1228 min_new = NewSize;
1229 }
1230 if (max_heap > min_new && min_heap_size() > min_new) {
1231 // Unless explicitly requested otherwise, make young gen
1232 // at least min_new, and at most preferred_max_new_size.
1233 if (FLAG_IS_DEFAULT(NewSize)) {
1234 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1235 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1236 if (PrintGCDetails && Verbose) {
1237 // Too early to use gclog_or_tty
1238 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1239 }
1240 }
1241 // Unless explicitly requested otherwise, size old gen
1242 // so it's NewRatio x of NewSize.
1243 if (FLAG_IS_DEFAULT(OldSize)) {
1244 if (max_heap > NewSize) {
1245 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1246 if (PrintGCDetails && Verbose) {
1247 // Too early to use gclog_or_tty
1248 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1249 }
1250 }
1251 }
1252 }
1253 }
1254 // Unless explicitly requested otherwise, definitely
1255 // promote all objects surviving "tenuring_default" scavenges.
1256 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1257 FLAG_IS_DEFAULT(SurvivorRatio)) {
1258 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1259 }
1260 // If we decided above (or user explicitly requested)
1261 // `promote all' (via MaxTenuringThreshold := 0),
1262 // prefer minuscule survivor spaces so as not to waste
1263 // space for (non-existent) survivors
1264 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1265 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1266 }
1267 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1268 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1269 // This is done in order to make ParNew+CMS configuration to work
1270 // with YoungPLABSize and OldPLABSize options.
1271 // See CR 6362902.
1272 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1273 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1274 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1275 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1276 // the value (either from the command line or ergonomics) of
1277 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1278 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1279 } else {
1280 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1281 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1282 // we'll let it to take precedence.
1283 jio_fprintf(defaultStream::error_stream(),
1284 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1285 " options are specified for the CMS collector."
1286 " CMSParPromoteBlocksToClaim will take precedence.\n");
1287 }
1288 }
1289 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1290 // OldPLAB sizing manually turned off: Use a larger default setting,
1291 // unless it was manually specified. This is because a too-low value
1292 // will slow down scavenges.
1293 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1294 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1295 }
1296 }
1297 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1298 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1299 // If either of the static initialization defaults have changed, note this
1300 // modification.
1301 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1302 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1303 }
1304 if (PrintGCDetails && Verbose) {
1305 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1306 MarkStackSize / K, MarkStackSizeMax / K);
1307 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1308 }
1309 }
1310
1311 void set_object_alignment() {
1312 // Object alignment.
1313 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1314 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1315 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1316 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1317 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1318 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1319
1320 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1321 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1322
1323 // Oop encoding heap max
1324 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1325
1326 // Set CMS global values
1327 CompactibleFreeListSpace::set_cms_values();
1328 }
1329
1330 bool verify_object_alignment() {
1331 // Object alignment.
1332 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1333 jio_fprintf(defaultStream::error_stream(),
1334 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1335 (int)ObjectAlignmentInBytes);
1336 return false;
1337 }
1338 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1339 jio_fprintf(defaultStream::error_stream(),
1340 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1341 (int)ObjectAlignmentInBytes, BytesPerLong);
1342 return false;
1343 }
1344 // It does not make sense to have big object alignment
1345 // since a space lost due to alignment will be greater
1346 // then a saved space from compressed oops.
1347 if ((int)ObjectAlignmentInBytes > 256) {
1348 jio_fprintf(defaultStream::error_stream(),
1349 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1350 (int)ObjectAlignmentInBytes);
1351 return false;
1352 }
1353 // In case page size is very small.
1354 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1355 jio_fprintf(defaultStream::error_stream(),
1356 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1357 (int)ObjectAlignmentInBytes, os::vm_page_size());
1358 return false;
1359 }
1360 return true;
1361 }
1362
1363 inline uintx max_heap_for_compressed_oops() {
1364 // Avoid sign flip.
1365 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1366 return 0;
1367 }
1368 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1369 NOT_LP64(ShouldNotReachHere(); return 0);
1370 }
1371
1372 bool Arguments::should_auto_select_low_pause_collector() {
1373 if (UseAutoGCSelectPolicy &&
1374 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1375 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1376 if (PrintGCDetails) {
1377 // Cannot use gclog_or_tty yet.
1378 tty->print_cr("Automatic selection of the low pause collector"
1379 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1380 }
1381 return true;
1382 }
1383 return false;
1384 }
1385
1386 void Arguments::set_ergonomics_flags() {
1387 // Parallel GC is not compatible with sharing. If one specifies
1388 // that they want sharing explicitly, do not set ergonomics flags.
1389 if (DumpSharedSpaces || RequireSharedSpaces) {
1390 return;
1391 }
1392
1393 if (os::is_server_class_machine()) {
1394 // If no other collector is requested explicitly,
1395 // let the VM select the collector based on
1396 // machine class and automatic selection policy.
1397 if (!UseSerialGC &&
1398 !UseConcMarkSweepGC &&
1399 !UseG1GC &&
1400 !UseParNewGC &&
1401 !DumpSharedSpaces &&
1402 FLAG_IS_DEFAULT(UseParallelGC)) {
1403 if (should_auto_select_low_pause_collector()) {
1404 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1405 } else {
1406 FLAG_SET_ERGO(bool, UseParallelGC, true);
1407 }
1408 no_shared_spaces();
1409 }
1410 }
1411
1412 #ifndef ZERO
1413 #ifdef _LP64
1414 // Check that UseCompressedOops can be set with the max heap size allocated
1415 // by ergonomics.
1416 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1417 #if !defined(COMPILER1) || defined(TIERED)
1418 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1419 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1420 }
1421 #endif
1422 #ifdef _WIN64
1423 if (UseLargePages && UseCompressedOops) {
1424 // Cannot allocate guard pages for implicit checks in indexed addressing
1425 // mode, when large pages are specified on windows.
1426 // This flag could be switched ON if narrow oop base address is set to 0,
1427 // see code in Universe::initialize_heap().
1428 Universe::set_narrow_oop_use_implicit_null_checks(false);
1429 }
1430 #endif // _WIN64
1431 } else {
1432 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1433 warning("Max heap size too large for Compressed Oops");
1434 FLAG_SET_DEFAULT(UseCompressedOops, false);
1435 }
1436 }
1437 // Also checks that certain machines are slower with compressed oops
1438 // in vm_version initialization code.
1439 #endif // _LP64
1440 #endif // !ZERO
1441 }
1442
1443 void Arguments::set_parallel_gc_flags() {
1444 assert(UseParallelGC || UseParallelOldGC, "Error");
1445 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1446 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1447 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1448 }
1449 FLAG_SET_DEFAULT(UseParallelGC, true);
1450
1451 if (UseAdaptiveSizePolicy) {
1452 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1453 // unless the user actually sets these flags.
1454 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1455 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1456 }
1457 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1458 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1459 }
1460 }
1461
1462 // If no heap maximum was requested explicitly, use some reasonable fraction
1463 // of the physical memory, up to a maximum of 1GB.
1464 if (UseParallelGC) {
1465 FLAG_SET_DEFAULT(ParallelGCThreads,
1466 Abstract_VM_Version::parallel_worker_threads());
1467
1468 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1469 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1470 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1471 // See CR 6362902 for details.
1472 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1473 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1474 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1475 }
1476 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1477 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1478 }
1479 }
1480
1481 if (UseParallelOldGC) {
1482 // Par compact uses lower default values since they are treated as
1483 // minimums. These are different defaults because of the different
1484 // interpretation and are not ergonomically set.
1485 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1486 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1487 }
1488 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1489 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1490 }
1491 }
1492 }
1493 if (UseNUMA) {
1494 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1495 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1496 }
1497 // For those collectors or operating systems (eg, Windows) that do
1498 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1499 UseNUMAInterleaving = true;
1500 }
1501 }
1502
1503 void Arguments::set_g1_gc_flags() {
1504 assert(UseG1GC, "Error");
1505 #ifdef COMPILER1
1506 FastTLABRefill = false;
1507 #endif
1508 FLAG_SET_DEFAULT(ParallelGCThreads,
1509 Abstract_VM_Version::parallel_worker_threads());
1510 if (ParallelGCThreads == 0) {
1511 FLAG_SET_DEFAULT(ParallelGCThreads,
1512 Abstract_VM_Version::parallel_worker_threads());
1513 }
1514 no_shared_spaces();
1515
1516 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1517 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1518 }
1519 if (PrintGCDetails && Verbose) {
1520 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1521 MarkStackSize / K, MarkStackSizeMax / K);
1522 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1523 }
1524
1525 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1526 // In G1, we want the default GC overhead goal to be higher than
1527 // say in PS. So we set it here to 10%. Otherwise the heap might
1528 // be expanded more aggressively than we would like it to. In
1529 // fact, even 10% seems to not be high enough in some cases
1530 // (especially small GC stress tests that the main thing they do
1531 // is allocation). We might consider increase it further.
1532 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1533 }
1534 }
1535
1536 void Arguments::set_heap_base_min_address() {
1537 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) {
1538 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86.
1539 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1
1540 // some extra space for the C-heap compared to other collectors.
1541 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that
1542 // code that checks for default values work correctly.
1543 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G);
1544 }
1545 }
1546
1547 void Arguments::set_heap_size() {
1548 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1549 // Deprecated flag
1550 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1551 }
1552
1553 const julong phys_mem =
1554 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1555 : (julong)MaxRAM;
1556
1557 // If the maximum heap size has not been set with -Xmx,
1558 // then set it as fraction of the size of physical memory,
1559 // respecting the maximum and minimum sizes of the heap.
1560 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1561 julong reasonable_max = phys_mem / MaxRAMFraction;
1562
1563 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1564 // Small physical memory, so use a minimum fraction of it for the heap
1565 reasonable_max = phys_mem / MinRAMFraction;
1566 } else {
1567 // Not-small physical memory, so require a heap at least
1568 // as large as MaxHeapSize
1569 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1570 }
1571 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1572 // Limit the heap size to ErgoHeapSizeLimit
1573 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1574 }
1575 if (UseCompressedOops) {
1576 // Limit the heap size to the maximum possible when using compressed oops
1577 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1578 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1579 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1580 // but it should be not less than default MaxHeapSize.
1581 max_coop_heap -= HeapBaseMinAddress;
1582 }
1583 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1584 }
1585 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1586
1587 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1588 // An initial heap size was specified on the command line,
1589 // so be sure that the maximum size is consistent. Done
1590 // after call to allocatable_physical_memory because that
1591 // method might reduce the allocation size.
1592 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1593 }
1594
1595 if (PrintGCDetails && Verbose) {
1596 // Cannot use gclog_or_tty yet.
1597 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1598 }
1599 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1600 }
1601
1602 // If the initial_heap_size has not been set with InitialHeapSize
1603 // or -Xms, then set it as fraction of the size of physical memory,
1604 // respecting the maximum and minimum sizes of the heap.
1605 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1606 julong reasonable_minimum = (julong)(OldSize + NewSize);
1607
1608 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1609
1610 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1611
1612 julong reasonable_initial = phys_mem / InitialRAMFraction;
1613
1614 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1615 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1616
1617 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1618
1619 if (PrintGCDetails && Verbose) {
1620 // Cannot use gclog_or_tty yet.
1621 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1622 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1623 }
1624 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1625 set_min_heap_size((uintx)reasonable_minimum);
1626 }
1627 }
1628
1629 // This must be called after ergonomics because we want bytecode rewriting
1630 // if the server compiler is used, or if UseSharedSpaces is disabled.
1631 void Arguments::set_bytecode_flags() {
1632 // Better not attempt to store into a read-only space.
1633 if (UseSharedSpaces) {
1634 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1635 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1636 }
1637
1638 if (!RewriteBytecodes) {
1639 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1640 }
1641 }
1642
1643 // Aggressive optimization flags -XX:+AggressiveOpts
1644 void Arguments::set_aggressive_opts_flags() {
1645 #ifdef COMPILER2
1646 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1647 // EliminateAutoBox code is broken in C2
1648 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1649 // FLAG_SET_DEFAULT(EliminateAutoBox, true);
1650 }
1651 if (EliminateAutoBox) {
1652 FLAG_SET_DEFAULT(EliminateAutoBox, false);
1653 }
1654 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1655 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1656 }
1657
1658 // Feed the cache size setting into the JDK
1659 char buffer[1024];
1660 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1661 add_property(buffer);
1662 }
1663 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1664 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1665 }
1666 #endif
1667
1668 if (AggressiveOpts) {
1669 // Sample flag setting code
1670 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1671 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1672 // }
1673 }
1674 }
1675
1676 //===========================================================================================================
1677 // Parsing of java.compiler property
1678
1679 void Arguments::process_java_compiler_argument(char* arg) {
1680 // For backwards compatibility, Djava.compiler=NONE or ""
1681 // causes us to switch to -Xint mode UNLESS -Xdebug
1682 // is also specified.
1683 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1684 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1685 }
1686 }
1687
1688 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1689 _sun_java_launcher = strdup(launcher);
1690 if (strcmp("gamma", _sun_java_launcher) == 0) {
1691 _created_by_gamma_launcher = true;
1692 }
1693 }
1694
1695 bool Arguments::created_by_java_launcher() {
1696 assert(_sun_java_launcher != NULL, "property must have value");
1697 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1698 }
1699
1700 bool Arguments::created_by_gamma_launcher() {
1701 return _created_by_gamma_launcher;
1702 }
1703
1704 //===========================================================================================================
1705 // Parsing of main arguments
1706
1707 bool Arguments::verify_interval(uintx val, uintx min,
1708 uintx max, const char* name) {
1709 // Returns true iff value is in the inclusive interval [min..max]
1710 // false, otherwise.
1711 if (val >= min && val <= max) {
1712 return true;
1713 }
1714 jio_fprintf(defaultStream::error_stream(),
1715 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1716 " and " UINTX_FORMAT "\n",
1717 name, val, min, max);
1718 return false;
1719 }
1720
1721 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1722 // Returns true if given value is at least specified min threshold
1723 // false, otherwise.
1724 if (val >= min ) {
1725 return true;
1726 }
1727 jio_fprintf(defaultStream::error_stream(),
1728 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1729 name, val, min);
1730 return false;
1731 }
1732
1733 bool Arguments::verify_percentage(uintx value, const char* name) {
1734 if (is_percentage(value)) {
1735 return true;
1736 }
1737 jio_fprintf(defaultStream::error_stream(),
1738 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1739 name, value);
1740 return false;
1741 }
1742
1743 static void force_serial_gc() {
1744 FLAG_SET_DEFAULT(UseSerialGC, true);
1745 FLAG_SET_DEFAULT(UseParNewGC, false);
1746 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1747 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1748 FLAG_SET_DEFAULT(UseParallelGC, false);
1749 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1750 FLAG_SET_DEFAULT(UseG1GC, false);
1751 }
1752
1753 static bool verify_serial_gc_flags() {
1754 return (UseSerialGC &&
1755 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1756 UseParallelGC || UseParallelOldGC));
1757 }
1758
1759 // check if do gclog rotation
1760 // +UseGCLogFileRotation is a must,
1761 // no gc log rotation when log file not supplied or
1762 // NumberOfGCLogFiles is 0
1763 void check_gclog_consistency() {
1764 if (UseGCLogFileRotation) {
1765 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1766 jio_fprintf(defaultStream::output_stream(),
1767 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1768 "where num_of_file > 0\n"
1769 "GC log rotation is turned off\n");
1770 UseGCLogFileRotation = false;
1771 }
1772 }
1773
1774 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1775 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1776 jio_fprintf(defaultStream::output_stream(),
1777 "GCLogFileSize changed to minimum 8K\n");
1778 }
1779 }
1780
1781 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1782 if (!is_percentage(min_heap_free_ratio)) {
1783 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1784 return false;
1785 }
1786 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1787 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1788 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1789 MaxHeapFreeRatio);
1790 return false;
1791 }
1792 return true;
1793 }
1794
1795 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1796 if (!is_percentage(max_heap_free_ratio)) {
1797 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1798 return false;
1799 }
1800 if (max_heap_free_ratio < MinHeapFreeRatio) {
1801 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1802 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1803 MinHeapFreeRatio);
1804 return false;
1805 }
1806 return true;
1807 }
1808
1809 // This function is called for -Xloggc:<filename>, it can be used
1810 // to check if a given file name(or string) conforms to the following
1811 // specification:
1812 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1813 // %p and %t only allowed once. We only limit usage of filename not path
1814 bool is_filename_valid(const char *file_name) {
1815 const char* p = file_name;
1816 char file_sep = os::file_separator()[0];
1817 const char* cp;
1818 // skip prefix path
1819 for (cp = file_name; *cp != '\0'; cp++) {
1820 if (*cp == '/' || *cp == file_sep) {
1821 p = cp + 1;
1822 }
1823 }
1824
1825 int count_p = 0;
1826 int count_t = 0;
1827 while (*p != '\0') {
1828 if ((*p >= '0' && *p <= '9') ||
1829 (*p >= 'A' && *p <= 'Z') ||
1830 (*p >= 'a' && *p <= 'z') ||
1831 *p == '-' ||
1832 *p == '_' ||
1833 *p == '.') {
1834 p++;
1835 continue;
1836 }
1837 if (*p == '%') {
1838 if(*(p + 1) == 'p') {
1839 p += 2;
1840 count_p ++;
1841 continue;
1842 }
1843 if (*(p + 1) == 't') {
1844 p += 2;
1845 count_t ++;
1846 continue;
1847 }
1848 }
1849 return false;
1850 }
1851 return count_p < 2 && count_t < 2;
1852 }
1853
1854 // Check consistency of GC selection
1855 bool Arguments::check_gc_consistency() {
1856 check_gclog_consistency();
1857 bool status = true;
1858 // Ensure that the user has not selected conflicting sets
1859 // of collectors. [Note: this check is merely a user convenience;
1860 // collectors over-ride each other so that only a non-conflicting
1861 // set is selected; however what the user gets is not what they
1862 // may have expected from the combination they asked for. It's
1863 // better to reduce user confusion by not allowing them to
1864 // select conflicting combinations.
1865 uint i = 0;
1866 if (UseSerialGC) i++;
1867 if (UseConcMarkSweepGC || UseParNewGC) i++;
1868 if (UseParallelGC || UseParallelOldGC) i++;
1869 if (UseG1GC) i++;
1870 if (i > 1) {
1871 jio_fprintf(defaultStream::error_stream(),
1872 "Conflicting collector combinations in option list; "
1873 "please refer to the release notes for the combinations "
1874 "allowed\n");
1875 status = false;
1876 }
1877
1878 return status;
1879 }
1880
1881 // Check stack pages settings
1882 bool Arguments::check_stack_pages()
1883 {
1884 bool status = true;
1885 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1886 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1887 // greater stack shadow pages can't generate instruction to bang stack
1888 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1889 return status;
1890 }
1891
1892 // Check the consistency of vm_init_args
1893 bool Arguments::check_vm_args_consistency() {
1894 // Method for adding checks for flag consistency.
1895 // The intent is to warn the user of all possible conflicts,
1896 // before returning an error.
1897 // Note: Needs platform-dependent factoring.
1898 bool status = true;
1899
1900 #if ( (defined(COMPILER2) && defined(SPARC)))
1901 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1902 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1903 // x86. Normally, VM_Version_init must be called from init_globals in
1904 // init.cpp, which is called by the initial java thread *after* arguments
1905 // have been parsed. VM_Version_init gets called twice on sparc.
1906 extern void VM_Version_init();
1907 VM_Version_init();
1908 if (!VM_Version::has_v9()) {
1909 jio_fprintf(defaultStream::error_stream(),
1910 "V8 Machine detected, Server requires V9\n");
1911 status = false;
1912 }
1913 #endif /* COMPILER2 && SPARC */
1914
1915 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1916 // builds so the cost of stack banging can be measured.
1917 #if (defined(PRODUCT) && defined(SOLARIS))
1918 if (!UseBoundThreads && !UseStackBanging) {
1919 jio_fprintf(defaultStream::error_stream(),
1920 "-UseStackBanging conflicts with -UseBoundThreads\n");
1921
1922 status = false;
1923 }
1924 #endif
1925
1926 if (TLABRefillWasteFraction == 0) {
1927 jio_fprintf(defaultStream::error_stream(),
1928 "TLABRefillWasteFraction should be a denominator, "
1929 "not " SIZE_FORMAT "\n",
1930 TLABRefillWasteFraction);
1931 status = false;
1932 }
1933
1934 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1935 "AdaptiveSizePolicyWeight");
1936 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1937 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1938
1939 {
1940 // Using "else if" below to avoid printing two error messages if min > max.
1941 // This will also prevent us from reporting both min>100 and max>100 at the
1942 // same time, but that is less annoying than printing two identical errors IMHO.
1943 FormatBuffer<80> err_msg("");
1944 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
1945 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
1946 status = false;
1947 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
1948 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
1949 status = false;
1950 }
1951 }
1952 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1953 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1954
1955 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1956 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1957 }
1958
1959 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1960 // Settings to encourage splitting.
1961 if (!FLAG_IS_CMDLINE(NewRatio)) {
1962 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1963 }
1964 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1965 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1966 }
1967 }
1968
1969 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1970 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1971 if (GCTimeLimit == 100) {
1972 // Turn off gc-overhead-limit-exceeded checks
1973 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1974 }
1975
1976 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1977
1978 status = status && check_gc_consistency();
1979 status = status && check_stack_pages();
1980
1981 if (_has_alloc_profile) {
1982 if (UseParallelGC || UseParallelOldGC) {
1983 jio_fprintf(defaultStream::error_stream(),
1984 "error: invalid argument combination.\n"
1985 "Allocation profiling (-Xaprof) cannot be used together with "
1986 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1987 status = false;
1988 }
1989 if (UseConcMarkSweepGC) {
1990 jio_fprintf(defaultStream::error_stream(),
1991 "error: invalid argument combination.\n"
1992 "Allocation profiling (-Xaprof) cannot be used together with "
1993 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1994 status = false;
1995 }
1996 }
1997
1998 if (CMSIncrementalMode) {
1999 if (!UseConcMarkSweepGC) {
2000 jio_fprintf(defaultStream::error_stream(),
2001 "error: invalid argument combination.\n"
2002 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2003 "selected in order\nto use CMSIncrementalMode.\n");
2004 status = false;
2005 } else {
2006 status = status && verify_percentage(CMSIncrementalDutyCycle,
2007 "CMSIncrementalDutyCycle");
2008 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2009 "CMSIncrementalDutyCycleMin");
2010 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2011 "CMSIncrementalSafetyFactor");
2012 status = status && verify_percentage(CMSIncrementalOffset,
2013 "CMSIncrementalOffset");
2014 status = status && verify_percentage(CMSExpAvgFactor,
2015 "CMSExpAvgFactor");
2016 // If it was not set on the command line, set
2017 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2018 if (CMSInitiatingOccupancyFraction < 0) {
2019 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2020 }
2021 }
2022 }
2023
2024 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2025 // insists that we hold the requisite locks so that the iteration is
2026 // MT-safe. For the verification at start-up and shut-down, we don't
2027 // yet have a good way of acquiring and releasing these locks,
2028 // which are not visible at the CollectedHeap level. We want to
2029 // be able to acquire these locks and then do the iteration rather
2030 // than just disable the lock verification. This will be fixed under
2031 // bug 4788986.
2032 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2033 if (VerifyDuringStartup) {
2034 warning("Heap verification at start-up disabled "
2035 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2036 VerifyDuringStartup = false; // Disable verification at start-up
2037 }
2038
2039 if (VerifyBeforeExit) {
2040 warning("Heap verification at shutdown disabled "
2041 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2042 VerifyBeforeExit = false; // Disable verification at shutdown
2043 }
2044 }
2045
2046 // Note: only executed in non-PRODUCT mode
2047 if (!UseAsyncConcMarkSweepGC &&
2048 (ExplicitGCInvokesConcurrent ||
2049 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2050 jio_fprintf(defaultStream::error_stream(),
2051 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2052 " with -UseAsyncConcMarkSweepGC");
2053 status = false;
2054 }
2055
2056 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2057
2058 #ifndef SERIALGC
2059 if (UseG1GC) {
2060 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2061 "InitiatingHeapOccupancyPercent");
2062 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2063 "G1RefProcDrainInterval");
2064 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2065 "G1ConcMarkStepDurationMillis");
2066 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2067 "G1ConcRSHotCardLimit");
2068 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2069 "G1ConcRSLogCacheSize");
2070 }
2071 #endif
2072
2073 status = status && verify_interval(RefDiscoveryPolicy,
2074 ReferenceProcessor::DiscoveryPolicyMin,
2075 ReferenceProcessor::DiscoveryPolicyMax,
2076 "RefDiscoveryPolicy");
2077
2078 // Limit the lower bound of this flag to 1 as it is used in a division
2079 // expression.
2080 status = status && verify_interval(TLABWasteTargetPercent,
2081 1, 100, "TLABWasteTargetPercent");
2082
2083 status = status && verify_object_alignment();
2084 #ifdef COMPILER1
2085 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2086 #endif
2087
2088 // check native memory tracking flags
2089 if (PrintNMTStatistics && MemTracker::tracking_level() == MemTracker::NMT_off) {
2090 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2091 PrintNMTStatistics = false;
2092 }
2093
2094 #ifdef COMPILER1
2095 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2096 #endif
2097
2098 return status;
2099 }
2100
2101 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2102 const char* option_type) {
2103 if (ignore) return false;
2104
2105 const char* spacer = " ";
2106 if (option_type == NULL) {
2107 option_type = ++spacer; // Set both to the empty string.
2108 }
2109
2110 if (os::obsolete_option(option)) {
2111 jio_fprintf(defaultStream::error_stream(),
2112 "Obsolete %s%soption: %s\n", option_type, spacer,
2113 option->optionString);
2114 return false;
2115 } else {
2116 jio_fprintf(defaultStream::error_stream(),
2117 "Unrecognized %s%soption: %s\n", option_type, spacer,
2118 option->optionString);
2119 return true;
2120 }
2121 }
2122
2123 static const char* user_assertion_options[] = {
2124 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2125 };
2126
2127 static const char* system_assertion_options[] = {
2128 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2129 };
2130
2131 // Return true if any of the strings in null-terminated array 'names' matches.
2132 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2133 // the option must match exactly.
2134 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2135 bool tail_allowed) {
2136 for (/* empty */; *names != NULL; ++names) {
2137 if (match_option(option, *names, tail)) {
2138 if (**tail == '\0' || tail_allowed && **tail == ':') {
2139 return true;
2140 }
2141 }
2142 }
2143 return false;
2144 }
2145
2146 bool Arguments::parse_uintx(const char* value,
2147 uintx* uintx_arg,
2148 uintx min_size) {
2149
2150 // Check the sign first since atomull() parses only unsigned values.
2151 bool value_is_positive = !(*value == '-');
2152
2153 if (value_is_positive) {
2154 julong n;
2155 bool good_return = atomull(value, &n);
2156 if (good_return) {
2157 bool above_minimum = n >= min_size;
2158 bool value_is_too_large = n > max_uintx;
2159
2160 if (above_minimum && !value_is_too_large) {
2161 *uintx_arg = n;
2162 return true;
2163 }
2164 }
2165 }
2166 return false;
2167 }
2168
2169 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2170 julong* long_arg,
2171 julong min_size) {
2172 if (!atomull(s, long_arg)) return arg_unreadable;
2173 return check_memory_size(*long_arg, min_size);
2174 }
2175
2176 // Parse JavaVMInitArgs structure
2177
2178 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2179 // For components of the system classpath.
2180 SysClassPath scp(Arguments::get_sysclasspath());
2181 bool scp_assembly_required = false;
2182
2183 // Save default settings for some mode flags
2184 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2185 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2186 Arguments::_ClipInlining = ClipInlining;
2187 Arguments::_BackgroundCompilation = BackgroundCompilation;
2188
2189 // Setup flags for mixed which is the default
2190 set_mode_flags(_mixed);
2191
2192 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2193 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2194 if (result != JNI_OK) {
2195 return result;
2196 }
2197
2198 // Parse JavaVMInitArgs structure passed in
2199 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2200 if (result != JNI_OK) {
2201 return result;
2202 }
2203
2204 if (AggressiveOpts) {
2205 // Insert alt-rt.jar between user-specified bootclasspath
2206 // prefix and the default bootclasspath. os::set_boot_path()
2207 // uses meta_index_dir as the default bootclasspath directory.
2208 const char* altclasses_jar = "alt-rt.jar";
2209 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2210 strlen(altclasses_jar);
2211 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2212 strcpy(altclasses_path, get_meta_index_dir());
2213 strcat(altclasses_path, altclasses_jar);
2214 scp.add_suffix_to_prefix(altclasses_path);
2215 scp_assembly_required = true;
2216 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2217 }
2218
2219 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2220 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2221 if (result != JNI_OK) {
2222 return result;
2223 }
2224
2225 // Do final processing now that all arguments have been parsed
2226 result = finalize_vm_init_args(&scp, scp_assembly_required);
2227 if (result != JNI_OK) {
2228 return result;
2229 }
2230
2231 return JNI_OK;
2232 }
2233
2234 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2235 SysClassPath* scp_p,
2236 bool* scp_assembly_required_p,
2237 FlagValueOrigin origin) {
2238 // Remaining part of option string
2239 const char* tail;
2240
2241 // iterate over arguments
2242 for (int index = 0; index < args->nOptions; index++) {
2243 bool is_absolute_path = false; // for -agentpath vs -agentlib
2244
2245 const JavaVMOption* option = args->options + index;
2246
2247 if (!match_option(option, "-Djava.class.path", &tail) &&
2248 !match_option(option, "-Dsun.java.command", &tail) &&
2249 !match_option(option, "-Dsun.java.launcher", &tail)) {
2250
2251 // add all jvm options to the jvm_args string. This string
2252 // is used later to set the java.vm.args PerfData string constant.
2253 // the -Djava.class.path and the -Dsun.java.command options are
2254 // omitted from jvm_args string as each have their own PerfData
2255 // string constant object.
2256 build_jvm_args(option->optionString);
2257 }
2258
2259 // -verbose:[class/gc/jni]
2260 if (match_option(option, "-verbose", &tail)) {
2261 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2262 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2263 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2264 } else if (!strcmp(tail, ":gc")) {
2265 FLAG_SET_CMDLINE(bool, PrintGC, true);
2266 } else if (!strcmp(tail, ":jni")) {
2267 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2268 }
2269 // -da / -ea / -disableassertions / -enableassertions
2270 // These accept an optional class/package name separated by a colon, e.g.,
2271 // -da:java.lang.Thread.
2272 } else if (match_option(option, user_assertion_options, &tail, true)) {
2273 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2274 if (*tail == '\0') {
2275 JavaAssertions::setUserClassDefault(enable);
2276 } else {
2277 assert(*tail == ':', "bogus match by match_option()");
2278 JavaAssertions::addOption(tail + 1, enable);
2279 }
2280 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2281 } else if (match_option(option, system_assertion_options, &tail, false)) {
2282 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2283 JavaAssertions::setSystemClassDefault(enable);
2284 // -bootclasspath:
2285 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2286 scp_p->reset_path(tail);
2287 *scp_assembly_required_p = true;
2288 // -bootclasspath/a:
2289 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2290 scp_p->add_suffix(tail);
2291 *scp_assembly_required_p = true;
2292 // -bootclasspath/p:
2293 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2294 scp_p->add_prefix(tail);
2295 *scp_assembly_required_p = true;
2296 // -Xrun
2297 } else if (match_option(option, "-Xrun", &tail)) {
2298 if (tail != NULL) {
2299 const char* pos = strchr(tail, ':');
2300 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2301 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2302 name[len] = '\0';
2303
2304 char *options = NULL;
2305 if(pos != NULL) {
2306 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2307 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2308 }
2309 add_init_library(name, options);
2310 }
2311 // -agentlib and -agentpath
2312 } else if (match_option(option, "-agentlib:", &tail) ||
2313 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2314 if(tail != NULL) {
2315 const char* pos = strchr(tail, '=');
2316 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2317 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2318 name[len] = '\0';
2319
2320 char *options = NULL;
2321 if(pos != NULL) {
2322 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2323 }
2324 add_init_agent(name, options, is_absolute_path);
2325
2326 }
2327 // -javaagent
2328 } else if (match_option(option, "-javaagent:", &tail)) {
2329 if(tail != NULL) {
2330 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2331 add_init_agent("instrument", options, false);
2332 }
2333 // -Xnoclassgc
2334 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2335 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2336 // -Xincgc: i-CMS
2337 } else if (match_option(option, "-Xincgc", &tail)) {
2338 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2339 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2340 // -Xnoincgc: no i-CMS
2341 } else if (match_option(option, "-Xnoincgc", &tail)) {
2342 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2343 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2344 // -Xconcgc
2345 } else if (match_option(option, "-Xconcgc", &tail)) {
2346 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2347 // -Xnoconcgc
2348 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2349 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2350 // -Xbatch
2351 } else if (match_option(option, "-Xbatch", &tail)) {
2352 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2353 // -Xmn for compatibility with other JVM vendors
2354 } else if (match_option(option, "-Xmn", &tail)) {
2355 julong long_initial_eden_size = 0;
2356 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2357 if (errcode != arg_in_range) {
2358 jio_fprintf(defaultStream::error_stream(),
2359 "Invalid initial eden size: %s\n", option->optionString);
2360 describe_range_error(errcode);
2361 return JNI_EINVAL;
2362 }
2363 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2364 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2365 // -Xms
2366 } else if (match_option(option, "-Xms", &tail)) {
2367 julong long_initial_heap_size = 0;
2368 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2369 if (errcode != arg_in_range) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "Invalid initial heap size: %s\n", option->optionString);
2372 describe_range_error(errcode);
2373 return JNI_EINVAL;
2374 }
2375 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2376 // Currently the minimum size and the initial heap sizes are the same.
2377 set_min_heap_size(InitialHeapSize);
2378 // -Xmx
2379 } else if (match_option(option, "-Xmx", &tail)) {
2380 julong long_max_heap_size = 0;
2381 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2382 if (errcode != arg_in_range) {
2383 jio_fprintf(defaultStream::error_stream(),
2384 "Invalid maximum heap size: %s\n", option->optionString);
2385 describe_range_error(errcode);
2386 return JNI_EINVAL;
2387 }
2388 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2389 // Xmaxf
2390 } else if (match_option(option, "-Xmaxf", &tail)) {
2391 int maxf = (int)(atof(tail) * 100);
2392 if (maxf < 0 || maxf > 100) {
2393 jio_fprintf(defaultStream::error_stream(),
2394 "Bad max heap free percentage size: %s\n",
2395 option->optionString);
2396 return JNI_EINVAL;
2397 } else {
2398 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2399 }
2400 // Xminf
2401 } else if (match_option(option, "-Xminf", &tail)) {
2402 int minf = (int)(atof(tail) * 100);
2403 if (minf < 0 || minf > 100) {
2404 jio_fprintf(defaultStream::error_stream(),
2405 "Bad min heap free percentage size: %s\n",
2406 option->optionString);
2407 return JNI_EINVAL;
2408 } else {
2409 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2410 }
2411 // -Xss
2412 } else if (match_option(option, "-Xss", &tail)) {
2413 julong long_ThreadStackSize = 0;
2414 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2415 if (errcode != arg_in_range) {
2416 jio_fprintf(defaultStream::error_stream(),
2417 "Invalid thread stack size: %s\n", option->optionString);
2418 describe_range_error(errcode);
2419 return JNI_EINVAL;
2420 }
2421 // Internally track ThreadStackSize in units of 1024 bytes.
2422 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2423 round_to((int)long_ThreadStackSize, K) / K);
2424 // -Xoss
2425 } else if (match_option(option, "-Xoss", &tail)) {
2426 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2427 // -Xmaxjitcodesize
2428 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2429 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2430 julong long_ReservedCodeCacheSize = 0;
2431 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2432 (size_t)InitialCodeCacheSize);
2433 if (errcode != arg_in_range) {
2434 jio_fprintf(defaultStream::error_stream(),
2435 "Invalid maximum code cache size: %s. Should be greater than or equal to InitialCodeCacheSize=%dK\n",
2436 option->optionString, InitialCodeCacheSize/K);
2437 describe_range_error(errcode);
2438 return JNI_EINVAL;
2439 }
2440 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2441 // -green
2442 } else if (match_option(option, "-green", &tail)) {
2443 jio_fprintf(defaultStream::error_stream(),
2444 "Green threads support not available\n");
2445 return JNI_EINVAL;
2446 // -native
2447 } else if (match_option(option, "-native", &tail)) {
2448 // HotSpot always uses native threads, ignore silently for compatibility
2449 // -Xsqnopause
2450 } else if (match_option(option, "-Xsqnopause", &tail)) {
2451 // EVM option, ignore silently for compatibility
2452 // -Xrs
2453 } else if (match_option(option, "-Xrs", &tail)) {
2454 // Classic/EVM option, new functionality
2455 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2456 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2457 // change default internal VM signals used - lower case for back compat
2458 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2459 // -Xoptimize
2460 } else if (match_option(option, "-Xoptimize", &tail)) {
2461 // EVM option, ignore silently for compatibility
2462 // -Xprof
2463 } else if (match_option(option, "-Xprof", &tail)) {
2464 _has_profile = true;
2465 // -Xaprof
2466 } else if (match_option(option, "-Xaprof", &tail)) {
2467 _has_alloc_profile = true;
2468 // -Xconcurrentio
2469 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2470 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2471 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2472 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2473 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2474 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2475
2476 // -Xinternalversion
2477 } else if (match_option(option, "-Xinternalversion", &tail)) {
2478 jio_fprintf(defaultStream::output_stream(), "%s\n",
2479 VM_Version::internal_vm_info_string());
2480 vm_exit(0);
2481 #ifndef PRODUCT
2482 // -Xprintflags
2483 } else if (match_option(option, "-Xprintflags", &tail)) {
2484 CommandLineFlags::printFlags(tty, false);
2485 vm_exit(0);
2486 #endif
2487 // -D
2488 } else if (match_option(option, "-D", &tail)) {
2489 if (CheckEndorsedAndExtDirs) {
2490 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
2491 // abort if -Djava.endorsed.dirs is set
2492 jio_fprintf(defaultStream::output_stream(),
2493 "-Djava.endorsed.dirs will not be supported in a future release.\n"
2494 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
2495 return JNI_EINVAL;
2496 }
2497 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
2498 // abort if -Djava.ext.dirs is set
2499 jio_fprintf(defaultStream::output_stream(),
2500 "-Djava.ext.dirs will not be supported in a future release.\n"
2501 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
2502 return JNI_EINVAL;
2503 }
2504 }
2505
2506 if (!add_property(tail)) {
2507 return JNI_ENOMEM;
2508 }
2509 // Out of the box management support
2510 if (match_option(option, "-Dcom.sun.management", &tail)) {
2511 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2512 }
2513 // -Xint
2514 } else if (match_option(option, "-Xint", &tail)) {
2515 set_mode_flags(_int);
2516 // -Xmixed
2517 } else if (match_option(option, "-Xmixed", &tail)) {
2518 set_mode_flags(_mixed);
2519 // -Xcomp
2520 } else if (match_option(option, "-Xcomp", &tail)) {
2521 // for testing the compiler; turn off all flags that inhibit compilation
2522 set_mode_flags(_comp);
2523
2524 // -Xshare:dump
2525 } else if (match_option(option, "-Xshare:dump", &tail)) {
2526 #ifdef TIERED
2527 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2528 set_mode_flags(_int); // Prevent compilation, which creates objects
2529 #elif defined(COMPILER2)
2530 vm_exit_during_initialization(
2531 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2532 #else
2533 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2534 set_mode_flags(_int); // Prevent compilation, which creates objects
2535 #endif
2536 // -Xshare:on
2537 } else if (match_option(option, "-Xshare:on", &tail)) {
2538 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2539 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2540 // -Xshare:auto
2541 } else if (match_option(option, "-Xshare:auto", &tail)) {
2542 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2543 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2544 // -Xshare:off
2545 } else if (match_option(option, "-Xshare:off", &tail)) {
2546 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2547 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2548
2549 // -Xverify
2550 } else if (match_option(option, "-Xverify", &tail)) {
2551 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2552 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2553 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2554 } else if (strcmp(tail, ":remote") == 0) {
2555 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2556 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2557 } else if (strcmp(tail, ":none") == 0) {
2558 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2559 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2560 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2561 return JNI_EINVAL;
2562 }
2563 // -Xdebug
2564 } else if (match_option(option, "-Xdebug", &tail)) {
2565 // note this flag has been used, then ignore
2566 set_xdebug_mode(true);
2567 // -Xnoagent
2568 } else if (match_option(option, "-Xnoagent", &tail)) {
2569 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2570 } else if (match_option(option, "-Xboundthreads", &tail)) {
2571 // Bind user level threads to kernel threads (Solaris only)
2572 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2573 } else if (match_option(option, "-Xloggc:", &tail)) {
2574 // Redirect GC output to the file. -Xloggc:<filename>
2575 // ostream_init_log(), when called will use this filename
2576 // to initialize a fileStream.
2577 _gc_log_filename = strdup(tail);
2578 if (!is_filename_valid(_gc_log_filename)) {
2579 jio_fprintf(defaultStream::output_stream(),
2580 "Invalid file name for use with -Xloggc: Filename can only contain the "
2581 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2582 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2583 return JNI_EINVAL;
2584 }
2585 FLAG_SET_CMDLINE(bool, PrintGC, true);
2586 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2587
2588 // JNI hooks
2589 } else if (match_option(option, "-Xcheck", &tail)) {
2590 if (!strcmp(tail, ":jni")) {
2591 CheckJNICalls = true;
2592 } else if (is_bad_option(option, args->ignoreUnrecognized,
2593 "check")) {
2594 return JNI_EINVAL;
2595 }
2596 } else if (match_option(option, "vfprintf", &tail)) {
2597 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2598 } else if (match_option(option, "exit", &tail)) {
2599 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2600 } else if (match_option(option, "abort", &tail)) {
2601 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2602 // -XX:+AggressiveHeap
2603 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2604
2605 // This option inspects the machine and attempts to set various
2606 // parameters to be optimal for long-running, memory allocation
2607 // intensive jobs. It is intended for machines with large
2608 // amounts of cpu and memory.
2609
2610 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2611 // VM, but we may not be able to represent the total physical memory
2612 // available (like having 8gb of memory on a box but using a 32bit VM).
2613 // Thus, we need to make sure we're using a julong for intermediate
2614 // calculations.
2615 julong initHeapSize;
2616 julong total_memory = os::physical_memory();
2617
2618 if (total_memory < (julong)256*M) {
2619 jio_fprintf(defaultStream::error_stream(),
2620 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2621 vm_exit(1);
2622 }
2623
2624 // The heap size is half of available memory, or (at most)
2625 // all of possible memory less 160mb (leaving room for the OS
2626 // when using ISM). This is the maximum; because adaptive sizing
2627 // is turned on below, the actual space used may be smaller.
2628
2629 initHeapSize = MIN2(total_memory / (julong)2,
2630 total_memory - (julong)160*M);
2631
2632 // Make sure that if we have a lot of memory we cap the 32 bit
2633 // process space. The 64bit VM version of this function is a nop.
2634 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2635
2636 // The perm gen is separate but contiguous with the
2637 // object heap (and is reserved with it) so subtract it
2638 // from the heap size.
2639 if (initHeapSize > MaxPermSize) {
2640 initHeapSize = initHeapSize - MaxPermSize;
2641 } else {
2642 warning("AggressiveHeap and MaxPermSize values may conflict");
2643 }
2644
2645 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2646 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2647 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2648 // Currently the minimum size and the initial heap sizes are the same.
2649 set_min_heap_size(initHeapSize);
2650 }
2651 if (FLAG_IS_DEFAULT(NewSize)) {
2652 // Make the young generation 3/8ths of the total heap.
2653 FLAG_SET_CMDLINE(uintx, NewSize,
2654 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2655 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2656 }
2657
2658 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2659 FLAG_SET_DEFAULT(UseLargePages, true);
2660 #endif
2661
2662 // Increase some data structure sizes for efficiency
2663 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2664 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2665 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2666
2667 // See the OldPLABSize comment below, but replace 'after promotion'
2668 // with 'after copying'. YoungPLABSize is the size of the survivor
2669 // space per-gc-thread buffers. The default is 4kw.
2670 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2671
2672 // OldPLABSize is the size of the buffers in the old gen that
2673 // UseParallelGC uses to promote live data that doesn't fit in the
2674 // survivor spaces. At any given time, there's one for each gc thread.
2675 // The default size is 1kw. These buffers are rarely used, since the
2676 // survivor spaces are usually big enough. For specjbb, however, there
2677 // are occasions when there's lots of live data in the young gen
2678 // and we end up promoting some of it. We don't have a definite
2679 // explanation for why bumping OldPLABSize helps, but the theory
2680 // is that a bigger PLAB results in retaining something like the
2681 // original allocation order after promotion, which improves mutator
2682 // locality. A minor effect may be that larger PLABs reduce the
2683 // number of PLAB allocation events during gc. The value of 8kw
2684 // was arrived at by experimenting with specjbb.
2685 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2686
2687 // Enable parallel GC and adaptive generation sizing
2688 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2689 FLAG_SET_DEFAULT(ParallelGCThreads,
2690 Abstract_VM_Version::parallel_worker_threads());
2691
2692 // Encourage steady state memory management
2693 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2694
2695 // This appears to improve mutator locality
2696 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2697
2698 // Get around early Solaris scheduling bug
2699 // (affinity vs other jobs on system)
2700 // but disallow DR and offlining (5008695).
2701 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2702
2703 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2704 // The last option must always win.
2705 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2706 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2707 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2708 // The last option must always win.
2709 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2710 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2711 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2712 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2713 jio_fprintf(defaultStream::error_stream(),
2714 "Please use CMSClassUnloadingEnabled in place of "
2715 "CMSPermGenSweepingEnabled in the future\n");
2716 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2717 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2718 jio_fprintf(defaultStream::error_stream(),
2719 "Please use -XX:+UseGCOverheadLimit in place of "
2720 "-XX:+UseGCTimeLimit in the future\n");
2721 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2722 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2723 jio_fprintf(defaultStream::error_stream(),
2724 "Please use -XX:-UseGCOverheadLimit in place of "
2725 "-XX:-UseGCTimeLimit in the future\n");
2726 // The TLE options are for compatibility with 1.3 and will be
2727 // removed without notice in a future release. These options
2728 // are not to be documented.
2729 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2730 // No longer used.
2731 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2732 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2733 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2734 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2735 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2736 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2737 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2738 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2739 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2740 // No longer used.
2741 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2742 julong long_tlab_size = 0;
2743 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2744 if (errcode != arg_in_range) {
2745 jio_fprintf(defaultStream::error_stream(),
2746 "Invalid TLAB size: %s\n", option->optionString);
2747 describe_range_error(errcode);
2748 return JNI_EINVAL;
2749 }
2750 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2751 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2752 // No longer used.
2753 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2754 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2755 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2756 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2757 SOLARIS_ONLY(
2758 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2759 warning("-XX:+UsePermISM is obsolete.");
2760 FLAG_SET_CMDLINE(bool, UseISM, true);
2761 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2762 FLAG_SET_CMDLINE(bool, UseISM, false);
2763 )
2764 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2765 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2766 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2767 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2768 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2769 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2770 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2771 #if defined(DTRACE_ENABLED)
2772 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2773 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2774 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2775 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2776 #else // defined(DTRACE_ENABLED)
2777 jio_fprintf(defaultStream::error_stream(),
2778 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2779 return JNI_EINVAL;
2780 #endif // defined(DTRACE_ENABLED)
2781 #ifdef ASSERT
2782 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2783 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2784 // disable scavenge before parallel mark-compact
2785 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2786 #endif
2787 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2788 julong cms_blocks_to_claim = (julong)atol(tail);
2789 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2790 jio_fprintf(defaultStream::error_stream(),
2791 "Please use -XX:OldPLABSize in place of "
2792 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2793 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2794 julong cms_blocks_to_claim = (julong)atol(tail);
2795 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Please use -XX:OldPLABSize in place of "
2798 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2799 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2800 julong old_plab_size = 0;
2801 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2802 if (errcode != arg_in_range) {
2803 jio_fprintf(defaultStream::error_stream(),
2804 "Invalid old PLAB size: %s\n", option->optionString);
2805 describe_range_error(errcode);
2806 return JNI_EINVAL;
2807 }
2808 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Please use -XX:OldPLABSize in place of "
2811 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2812 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2813 julong young_plab_size = 0;
2814 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2815 if (errcode != arg_in_range) {
2816 jio_fprintf(defaultStream::error_stream(),
2817 "Invalid young PLAB size: %s\n", option->optionString);
2818 describe_range_error(errcode);
2819 return JNI_EINVAL;
2820 }
2821 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2822 jio_fprintf(defaultStream::error_stream(),
2823 "Please use -XX:YoungPLABSize in place of "
2824 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2825 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2826 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2827 julong stack_size = 0;
2828 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2829 if (errcode != arg_in_range) {
2830 jio_fprintf(defaultStream::error_stream(),
2831 "Invalid mark stack size: %s\n", option->optionString);
2832 describe_range_error(errcode);
2833 return JNI_EINVAL;
2834 }
2835 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2836 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2837 julong max_stack_size = 0;
2838 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2839 if (errcode != arg_in_range) {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "Invalid maximum mark stack size: %s\n",
2842 option->optionString);
2843 describe_range_error(errcode);
2844 return JNI_EINVAL;
2845 }
2846 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2847 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2848 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2849 uintx conc_threads = 0;
2850 if (!parse_uintx(tail, &conc_threads, 1)) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid concurrent threads: %s\n", option->optionString);
2853 return JNI_EINVAL;
2854 }
2855 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2856 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2857 julong max_direct_memory_size = 0;
2858 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2859 if (errcode != arg_in_range) {
2860 jio_fprintf(defaultStream::error_stream(),
2861 "Invalid maximum direct memory size: %s\n",
2862 option->optionString);
2863 describe_range_error(errcode);
2864 return JNI_EINVAL;
2865 }
2866 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2867 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2868 // Skip -XX:Flags= since that case has already been handled
2869 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2870 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2871 return JNI_EINVAL;
2872 }
2873 }
2874 // Unknown option
2875 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2876 return JNI_ERR;
2877 }
2878 }
2879
2880 // Change the default value for flags which have different default values
2881 // when working with older JDKs.
2882 if (JDK_Version::current().compare_major(6) <= 0 &&
2883 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2884 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2885 }
2886 #ifdef LINUX
2887 if (JDK_Version::current().compare_major(6) <= 0 &&
2888 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2889 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2890 }
2891 #endif // LINUX
2892 return JNI_OK;
2893 }
2894
2895 static bool has_jar_files(const char* directory) {
2896 DIR* dir = os::opendir(directory);
2897 if (dir == NULL) return false;
2898
2899 struct dirent *entry;
2900 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
2901 bool hasJarFile = false;
2902 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
2903 const char* name = entry->d_name;
2904 const char* ext = name + strlen(name) - 4;
2905 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
2906 }
2907 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
2908 os::closedir(dir);
2909 return hasJarFile ;
2910 }
2911
2912 // returns the number of directories in the given path containing JAR files
2913 // If the skip argument is not NULL, it will skip that directory
2914 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
2915 const char separator = *os::path_separator();
2916 const char* const end = path + strlen(path);
2917 int nonEmptyDirs = 0;
2918 while (path < end) {
2919 const char* tmp_end = strchr(path, separator);
2920 if (tmp_end == NULL) {
2921 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
2922 nonEmptyDirs++;
2923 jio_fprintf(defaultStream::output_stream(),
2924 "Non-empty %s directory: %s\n", type, path);
2925 }
2926 path = end;
2927 } else {
2928 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
2929 memcpy(dirpath, path, tmp_end - path);
2930 dirpath[tmp_end - path] = '\0';
2931 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
2932 nonEmptyDirs++;
2933 jio_fprintf(defaultStream::output_stream(),
2934 "Non-empty %s directory: %s\n", type, dirpath);
2935 }
2936 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
2937 path = tmp_end + 1;
2938 }
2939 }
2940 return nonEmptyDirs;
2941 }
2942
2943 // Returns true if endorsed standards override mechanism and extension mechanism
2944 // are not used.
2945 static bool check_endorsed_and_ext_dirs() {
2946 if (!CheckEndorsedAndExtDirs)
2947 return true;
2948
2949 char endorsedDir[JVM_MAXPATHLEN];
2950 char extDir[JVM_MAXPATHLEN];
2951 const char* fileSep = os::file_separator();
2952 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
2953 Arguments::get_java_home(), fileSep, fileSep);
2954 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
2955 Arguments::get_java_home(), fileSep, fileSep);
2956
2957 // check endorsed directory
2958 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
2959
2960 // check the extension directories but skip the default lib/ext directory
2961 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
2962
2963 // List of JAR files installed in the default lib/ext directory.
2964 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
2965 static const char* jdk_ext_jars[] = {
2966 "access-bridge-32.jar",
2967 "access-bridge-64.jar",
2968 "access-bridge.jar",
2969 "cldrdata.jar",
2970 "dnsns.jar",
2971 "jaccess.jar",
2972 "jfxrt.jar",
2973 "localedata.jar",
2974 "nashorn.jar",
2975 "sunec.jar",
2976 "sunjce_provider.jar",
2977 "sunmscapi.jar",
2978 "sunpkcs11.jar",
2979 "ucrypto.jar",
2980 "zipfs.jar",
2981 NULL
2982 };
2983
2984 // check if the default lib/ext directory has any non-JDK jar files; if so, error
2985 DIR* dir = os::opendir(extDir);
2986 if (dir != NULL) {
2987 int num_ext_jars = 0;
2988 struct dirent *entry;
2989 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
2990 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
2991 const char* name = entry->d_name;
2992 const char* ext = name + strlen(name) - 4;
2993 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
2994 bool is_jdk_jar = false;
2995 const char* jarfile = NULL;
2996 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
2997 if (os::file_name_strcmp(name, jarfile) == 0) {
2998 is_jdk_jar = true;
2999 break;
3000 }
3001 }
3002 if (!is_jdk_jar) {
3003 jio_fprintf(defaultStream::output_stream(),
3004 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3005 num_ext_jars++;
3006 }
3007 }
3008 }
3009 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3010 os::closedir(dir);
3011 if (num_ext_jars > 0) {
3012 nonEmptyDirs += 1;
3013 }
3014 }
3015
3016 // check if the default lib/endorsed directory exists; if so, error
3017 dir = os::opendir(endorsedDir);
3018 if (dir != NULL) {
3019 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3020 os::closedir(dir);
3021 nonEmptyDirs += 1;
3022 }
3023
3024 if (nonEmptyDirs > 0) {
3025 jio_fprintf(defaultStream::output_stream(),
3026 "Endorsed standards override mechanism and extension mechanism"
3027 "will not be supported in a future release.\n"
3028 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3029 return false;
3030 }
3031
3032 return true;
3033 }
3034
3035 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3036 // This must be done after all -D arguments have been processed.
3037 scp_p->expand_endorsed();
3038
3039 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3040 // Assemble the bootclasspath elements into the final path.
3041 Arguments::set_sysclasspath(scp_p->combined_path());
3042 }
3043
3044 if (!check_endorsed_and_ext_dirs()) {
3045 return JNI_ERR;
3046 }
3047
3048 // This must be done after all arguments have been processed.
3049 // java_compiler() true means set to "NONE" or empty.
3050 if (java_compiler() && !xdebug_mode()) {
3051 // For backwards compatibility, we switch to interpreted mode if
3052 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3053 // not specified.
3054 set_mode_flags(_int);
3055 }
3056 if (CompileThreshold == 0) {
3057 set_mode_flags(_int);
3058 }
3059
3060 #ifndef COMPILER2
3061 // Don't degrade server performance for footprint
3062 if (FLAG_IS_DEFAULT(UseLargePages) &&
3063 MaxHeapSize < LargePageHeapSizeThreshold) {
3064 // No need for large granularity pages w/small heaps.
3065 // Note that large pages are enabled/disabled for both the
3066 // Java heap and the code cache.
3067 FLAG_SET_DEFAULT(UseLargePages, false);
3068 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
3069 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
3070 }
3071
3072 // Tiered compilation is undefined with C1.
3073 TieredCompilation = false;
3074 #else
3075 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3076 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3077 }
3078 #endif
3079
3080 // If we are running in a headless jre, force java.awt.headless property
3081 // to be true unless the property has already been set.
3082 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3083 if (os::is_headless_jre()) {
3084 const char* headless = Arguments::get_property("java.awt.headless");
3085 if (headless == NULL) {
3086 char envbuffer[128];
3087 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3088 if (!add_property("java.awt.headless=true")) {
3089 return JNI_ENOMEM;
3090 }
3091 } else {
3092 char buffer[256];
3093 strcpy(buffer, "java.awt.headless=");
3094 strcat(buffer, envbuffer);
3095 if (!add_property(buffer)) {
3096 return JNI_ENOMEM;
3097 }
3098 }
3099 }
3100 }
3101
3102 if (!check_vm_args_consistency()) {
3103 return JNI_ERR;
3104 }
3105
3106 return JNI_OK;
3107 }
3108
3109 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3110 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3111 scp_assembly_required_p);
3112 }
3113
3114 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3115 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3116 scp_assembly_required_p);
3117 }
3118
3119 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3120 const int N_MAX_OPTIONS = 64;
3121 const int OPTION_BUFFER_SIZE = 1024;
3122 char buffer[OPTION_BUFFER_SIZE];
3123
3124 // The variable will be ignored if it exceeds the length of the buffer.
3125 // Don't check this variable if user has special privileges
3126 // (e.g. unix su command).
3127 if (os::getenv(name, buffer, sizeof(buffer)) &&
3128 !os::have_special_privileges()) {
3129 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3130 jio_fprintf(defaultStream::error_stream(),
3131 "Picked up %s: %s\n", name, buffer);
3132 char* rd = buffer; // pointer to the input string (rd)
3133 int i;
3134 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3135 while (isspace(*rd)) rd++; // skip whitespace
3136 if (*rd == 0) break; // we re done when the input string is read completely
3137
3138 // The output, option string, overwrites the input string.
3139 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3140 // input string (rd).
3141 char* wrt = rd;
3142
3143 options[i++].optionString = wrt; // Fill in option
3144 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3145 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3146 int quote = *rd; // matching quote to look for
3147 rd++; // don't copy open quote
3148 while (*rd != quote) { // include everything (even spaces) up until quote
3149 if (*rd == 0) { // string termination means unmatched string
3150 jio_fprintf(defaultStream::error_stream(),
3151 "Unmatched quote in %s\n", name);
3152 return JNI_ERR;
3153 }
3154 *wrt++ = *rd++; // copy to option string
3155 }
3156 rd++; // don't copy close quote
3157 } else {
3158 *wrt++ = *rd++; // copy to option string
3159 }
3160 }
3161 // Need to check if we're done before writing a NULL,
3162 // because the write could be to the byte that rd is pointing to.
3163 if (*rd++ == 0) {
3164 *wrt = 0;
3165 break;
3166 }
3167 *wrt = 0; // Zero terminate option
3168 }
3169 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3170 JavaVMInitArgs vm_args;
3171 vm_args.version = JNI_VERSION_1_2;
3172 vm_args.options = options;
3173 vm_args.nOptions = i;
3174 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3175
3176 if (PrintVMOptions) {
3177 const char* tail;
3178 for (int i = 0; i < vm_args.nOptions; i++) {
3179 const JavaVMOption *option = vm_args.options + i;
3180 if (match_option(option, "-XX:", &tail)) {
3181 logOption(tail);
3182 }
3183 }
3184 }
3185
3186 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3187 }
3188 return JNI_OK;
3189 }
3190
3191 void Arguments::set_shared_spaces_flags() {
3192 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3193 const bool might_share = must_share || UseSharedSpaces;
3194
3195 // The string table is part of the shared archive so the size must match.
3196 if (!FLAG_IS_DEFAULT(StringTableSize)) {
3197 // Disable sharing.
3198 if (must_share) {
3199 warning("disabling shared archive %s because of non-default "
3200 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
3201 }
3202 if (might_share) {
3203 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
3204 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
3205 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3206 }
3207 return;
3208 }
3209
3210 // Check whether class data sharing settings conflict with GC, compressed oops
3211 // or page size, and fix them up. Explicit sharing options override other
3212 // settings.
3213 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
3214 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
3215 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
3216 if (cannot_share) {
3217 if (must_share) {
3218 warning("selecting serial gc and disabling large pages %s"
3219 "because of %s", "" LP64_ONLY("and compressed oops "),
3220 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3221 force_serial_gc();
3222 FLAG_SET_CMDLINE(bool, UseLargePages, false);
3223 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
3224 } else {
3225 if (UseSharedSpaces && Verbose) {
3226 warning("turning off use of shared archive because of "
3227 "choice of garbage collector or large pages");
3228 }
3229 no_shared_spaces();
3230 }
3231 } else if (UseLargePages && might_share) {
3232 // Disable large pages to allow shared spaces. This is sub-optimal, since
3233 // there may not even be a shared archive to use.
3234 FLAG_SET_DEFAULT(UseLargePages, false);
3235 }
3236 }
3237
3238 // Disable options not supported in this release, with a warning if they
3239 // were explicitly requested on the command-line
3240 #define UNSUPPORTED_OPTION(opt, description) \
3241 do { \
3242 if (opt) { \
3243 if (FLAG_IS_CMDLINE(opt)) { \
3244 warning(description " is disabled in this release."); \
3245 } \
3246 FLAG_SET_DEFAULT(opt, false); \
3247 } \
3248 } while(0)
3249
3250 // Parse entry point called from JNI_CreateJavaVM
3251
3252 jint Arguments::parse(const JavaVMInitArgs* args) {
3253
3254 // Sharing support
3255 // Construct the path to the archive
3256 char jvm_path[JVM_MAXPATHLEN];
3257 os::jvm_path(jvm_path, sizeof(jvm_path));
3258 char *end = strrchr(jvm_path, *os::file_separator());
3259 if (end != NULL) *end = '\0';
3260 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3261 strlen(os::file_separator()) + 20, mtInternal);
3262 if (shared_archive_path == NULL) return JNI_ENOMEM;
3263 strcpy(shared_archive_path, jvm_path);
3264 strcat(shared_archive_path, os::file_separator());
3265 strcat(shared_archive_path, "classes");
3266 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
3267 strcat(shared_archive_path, ".jsa");
3268 SharedArchivePath = shared_archive_path;
3269
3270 // Remaining part of option string
3271 const char* tail;
3272
3273 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3274 const char* hotspotrc = ".hotspotrc";
3275 bool settings_file_specified = false;
3276 bool needs_hotspotrc_warning = false;
3277
3278 const char* flags_file;
3279 int index;
3280 for (index = 0; index < args->nOptions; index++) {
3281 const JavaVMOption *option = args->options + index;
3282 if (match_option(option, "-XX:Flags=", &tail)) {
3283 flags_file = tail;
3284 settings_file_specified = true;
3285 }
3286 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3287 PrintVMOptions = true;
3288 }
3289 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3290 PrintVMOptions = false;
3291 }
3292 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3293 IgnoreUnrecognizedVMOptions = true;
3294 }
3295 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3296 IgnoreUnrecognizedVMOptions = false;
3297 }
3298 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3299 CommandLineFlags::printFlags(tty, false);
3300 vm_exit(0);
3301 }
3302 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3303 MemTracker::init_tracking_options(tail);
3304 }
3305
3306
3307 #ifndef PRODUCT
3308 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3309 CommandLineFlags::printFlags(tty, true);
3310 vm_exit(0);
3311 }
3312 #endif
3313 }
3314
3315 if (IgnoreUnrecognizedVMOptions) {
3316 // uncast const to modify the flag args->ignoreUnrecognized
3317 *(jboolean*)(&args->ignoreUnrecognized) = true;
3318 }
3319
3320 // Parse specified settings file
3321 if (settings_file_specified) {
3322 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3323 return JNI_EINVAL;
3324 }
3325 } else {
3326 #ifdef ASSERT
3327 // Parse default .hotspotrc settings file
3328 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3329 return JNI_EINVAL;
3330 }
3331 #else
3332 struct stat buf;
3333 if (os::stat(hotspotrc, &buf) == 0) {
3334 needs_hotspotrc_warning = true;
3335 }
3336 #endif
3337 }
3338
3339 if (PrintVMOptions) {
3340 for (index = 0; index < args->nOptions; index++) {
3341 const JavaVMOption *option = args->options + index;
3342 if (match_option(option, "-XX:", &tail)) {
3343 logOption(tail);
3344 }
3345 }
3346 }
3347
3348 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3349 jint result = parse_vm_init_args(args);
3350 if (result != JNI_OK) {
3351 return result;
3352 }
3353
3354 // Delay warning until here so that we've had a chance to process
3355 // the -XX:-PrintWarnings flag
3356 if (needs_hotspotrc_warning) {
3357 warning("%s file is present but has been ignored. "
3358 "Run with -XX:Flags=%s to load the file.",
3359 hotspotrc, hotspotrc);
3360 }
3361
3362 #if (defined JAVASE_EMBEDDED || defined ARM)
3363 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3364 #endif
3365
3366 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3367 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3368 #endif
3369
3370 #ifndef PRODUCT
3371 if (TraceBytecodesAt != 0) {
3372 TraceBytecodes = true;
3373 }
3374 if (CountCompiledCalls) {
3375 if (UseCounterDecay) {
3376 warning("UseCounterDecay disabled because CountCalls is set");
3377 UseCounterDecay = false;
3378 }
3379 }
3380 #endif // PRODUCT
3381
3382 // JSR 292 is not supported before 1.7
3383 if (!JDK_Version::is_gte_jdk17x_version()) {
3384 if (EnableInvokeDynamic) {
3385 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3386 warning("JSR 292 is not supported before 1.7. Disabling support.");
3387 }
3388 EnableInvokeDynamic = false;
3389 }
3390 }
3391
3392 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3393 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3394 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3395 }
3396 ScavengeRootsInCode = 1;
3397 }
3398 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3399 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3400 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3401 }
3402 ScavengeRootsInCode = 1;
3403 }
3404
3405 if (PrintGCDetails) {
3406 // Turn on -verbose:gc options as well
3407 PrintGC = true;
3408 }
3409
3410 if (!JDK_Version::is_gte_jdk18x_version()) {
3411 // To avoid changing the log format for 7 updates this flag is only
3412 // true by default in JDK8 and above.
3413 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3414 FLAG_SET_DEFAULT(PrintGCCause, false);
3415 }
3416 }
3417
3418 // Set object alignment values.
3419 set_object_alignment();
3420
3421 #ifdef SERIALGC
3422 force_serial_gc();
3423 #endif // SERIALGC
3424
3425 // Set flags based on ergonomics.
3426 set_ergonomics_flags();
3427
3428 set_shared_spaces_flags();
3429
3430 // Check the GC selections again.
3431 if (!check_gc_consistency()) {
3432 return JNI_EINVAL;
3433 }
3434
3435 if (TieredCompilation) {
3436 set_tiered_flags();
3437 } else {
3438 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3439 if (CompilationPolicyChoice >= 2) {
3440 vm_exit_during_initialization(
3441 "Incompatible compilation policy selected", NULL);
3442 }
3443 }
3444 set_heap_base_min_address();
3445 // Set heap size based on available physical memory
3446 set_heap_size();
3447 // Set per-collector flags
3448 if (UseParallelGC || UseParallelOldGC) {
3449 set_parallel_gc_flags();
3450 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3451 set_cms_and_parnew_gc_flags();
3452 } else if (UseParNewGC) { // skipped if CMS is set above
3453 set_parnew_gc_flags();
3454 } else if (UseG1GC) {
3455 set_g1_gc_flags();
3456 }
3457
3458 #ifdef SERIALGC
3459 assert(verify_serial_gc_flags(), "SerialGC unset");
3460 #endif // SERIALGC
3461
3462 // Set bytecode rewriting flags
3463 set_bytecode_flags();
3464
3465 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3466 set_aggressive_opts_flags();
3467
3468 // Turn off biased locking for locking debug mode flags,
3469 // which are subtlely different from each other but neither works with
3470 // biased locking.
3471 if (UseHeavyMonitors
3472 #ifdef COMPILER1
3473 || !UseFastLocking
3474 #endif // COMPILER1
3475 ) {
3476 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3477 // flag set to true on command line; warn the user that they
3478 // can't enable biased locking here
3479 warning("Biased Locking is not supported with locking debug flags"
3480 "; ignoring UseBiasedLocking flag." );
3481 }
3482 UseBiasedLocking = false;
3483 }
3484
3485 #ifdef CC_INTERP
3486 // Clear flags not supported by the C++ interpreter
3487 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3488 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3489 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3490 #endif // CC_INTERP
3491
3492 #ifdef COMPILER2
3493 if (!EliminateLocks) {
3494 EliminateNestedLocks = false;
3495 }
3496 if (!Inline) {
3497 IncrementalInline = false;
3498 }
3499 #ifndef PRODUCT
3500 if (!IncrementalInline) {
3501 AlwaysIncrementalInline = false;
3502 }
3503 #endif
3504 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3505 // incremental inlining: bump MaxNodeLimit
3506 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3507 }
3508 #endif
3509
3510 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3511 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3512 DebugNonSafepoints = true;
3513 }
3514
3515 #ifndef PRODUCT
3516 if (CompileTheWorld) {
3517 // Force NmethodSweeper to sweep whole CodeCache each time.
3518 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3519 NmethodSweepFraction = 1;
3520 }
3521 }
3522 #endif
3523
3524 if (PrintCommandLineFlags) {
3525 CommandLineFlags::printSetFlags(tty);
3526 }
3527
3528 // Apply CPU specific policy for the BiasedLocking
3529 if (UseBiasedLocking) {
3530 if (!VM_Version::use_biased_locking() &&
3531 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3532 UseBiasedLocking = false;
3533 }
3534 }
3535
3536 #ifdef COMPILER2
3537 if (!UseBiasedLocking || EmitSync != 0) {
3538 UseOptoBiasInlining = false;
3539 }
3540 #endif
3541
3542 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3543 // but only if not already set on the commandline
3544 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3545 bool set = false;
3546 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3547 if (!set) {
3548 FLAG_SET_DEFAULT(PauseAtExit, true);
3549 }
3550 }
3551
3552 return JNI_OK;
3553 }
3554
3555 int Arguments::PropertyList_count(SystemProperty* pl) {
3556 int count = 0;
3557 while(pl != NULL) {
3558 count++;
3559 pl = pl->next();
3560 }
3561 return count;
3562 }
3563
3564 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3565 assert(key != NULL, "just checking");
3566 SystemProperty* prop;
3567 for (prop = pl; prop != NULL; prop = prop->next()) {
3568 if (strcmp(key, prop->key()) == 0) return prop->value();
3569 }
3570 return NULL;
3571 }
3572
3573 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3574 int count = 0;
3575 const char* ret_val = NULL;
3576
3577 while(pl != NULL) {
3578 if(count >= index) {
3579 ret_val = pl->key();
3580 break;
3581 }
3582 count++;
3583 pl = pl->next();
3584 }
3585
3586 return ret_val;
3587 }
3588
3589 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3590 int count = 0;
3591 char* ret_val = NULL;
3592
3593 while(pl != NULL) {
3594 if(count >= index) {
3595 ret_val = pl->value();
3596 break;
3597 }
3598 count++;
3599 pl = pl->next();
3600 }
3601
3602 return ret_val;
3603 }
3604
3605 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3606 SystemProperty* p = *plist;
3607 if (p == NULL) {
3608 *plist = new_p;
3609 } else {
3610 while (p->next() != NULL) {
3611 p = p->next();
3612 }
3613 p->set_next(new_p);
3614 }
3615 }
3616
3617 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3618 if (plist == NULL)
3619 return;
3620
3621 SystemProperty* new_p = new SystemProperty(k, v, true);
3622 PropertyList_add(plist, new_p);
3623 }
3624
3625 // This add maintains unique property key in the list.
3626 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3627 if (plist == NULL)
3628 return;
3629
3630 // If property key exist then update with new value.
3631 SystemProperty* prop;
3632 for (prop = *plist; prop != NULL; prop = prop->next()) {
3633 if (strcmp(k, prop->key()) == 0) {
3634 if (append) {
3635 prop->append_value(v);
3636 } else {
3637 prop->set_value(v);
3638 }
3639 return;
3640 }
3641 }
3642
3643 PropertyList_add(plist, k, v);
3644 }
3645
3646 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3647 // Returns true if all of the source pointed by src has been copied over to
3648 // the destination buffer pointed by buf. Otherwise, returns false.
3649 // Notes:
3650 // 1. If the length (buflen) of the destination buffer excluding the
3651 // NULL terminator character is not long enough for holding the expanded
3652 // pid characters, it also returns false instead of returning the partially
3653 // expanded one.
3654 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3655 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3656 char* buf, size_t buflen) {
3657 const char* p = src;
3658 char* b = buf;
3659 const char* src_end = &src[srclen];
3660 char* buf_end = &buf[buflen - 1];
3661
3662 while (p < src_end && b < buf_end) {
3663 if (*p == '%') {
3664 switch (*(++p)) {
3665 case '%': // "%%" ==> "%"
3666 *b++ = *p++;
3667 break;
3668 case 'p': { // "%p" ==> current process id
3669 // buf_end points to the character before the last character so
3670 // that we could write '\0' to the end of the buffer.
3671 size_t buf_sz = buf_end - b + 1;
3672 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3673
3674 // if jio_snprintf fails or the buffer is not long enough to hold
3675 // the expanded pid, returns false.
3676 if (ret < 0 || ret >= (int)buf_sz) {
3677 return false;
3678 } else {
3679 b += ret;
3680 assert(*b == '\0', "fail in copy_expand_pid");
3681 if (p == src_end && b == buf_end + 1) {
3682 // reach the end of the buffer.
3683 return true;
3684 }
3685 }
3686 p++;
3687 break;
3688 }
3689 default :
3690 *b++ = '%';
3691 }
3692 } else {
3693 *b++ = *p++;
3694 }
3695 }
3696 *b = '\0';
3697 return (p == src_end); // return false if not all of the source was copied
3698 }