Fri, 02 May 2014 06:24:39 +0200
8041992: Fix of JDK-8034775 neglects to account for non-JIT VMs
Summary: Allow 0 compiler threads if no JIT is used.
Reviewed-by: kvn, dholmes
Contributed-by: Severin Gehwolf <sgehwolf@redhat.com>
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 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #ifdef TARGET_OS_FAMILY_linux
48 # include "os_linux.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_solaris
51 # include "os_solaris.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_windows
54 # include "os_windows.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_aix
57 # include "os_aix.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_bsd
60 # include "os_bsd.inline.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
66 #endif // INCLUDE_ALL_GCS
68 // Note: This is a special bug reporting site for the JVM
69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
70 #define DEFAULT_JAVA_LAUNCHER "generic"
72 // Disable options not supported in this release, with a warning if they
73 // were explicitly requested on the command-line
74 #define UNSUPPORTED_OPTION(opt, description) \
75 do { \
76 if (opt) { \
77 if (FLAG_IS_CMDLINE(opt)) { \
78 warning(description " is disabled in this release."); \
79 } \
80 FLAG_SET_DEFAULT(opt, false); \
81 } \
82 } while(0)
84 #define UNSUPPORTED_GC_OPTION(gc) \
85 do { \
86 if (gc) { \
87 if (FLAG_IS_CMDLINE(gc)) { \
88 warning(#gc " is not supported in this VM. Using Serial GC."); \
89 } \
90 FLAG_SET_DEFAULT(gc, false); \
91 } \
92 } while(0)
94 char** Arguments::_jvm_flags_array = NULL;
95 int Arguments::_num_jvm_flags = 0;
96 char** Arguments::_jvm_args_array = NULL;
97 int Arguments::_num_jvm_args = 0;
98 char* Arguments::_java_command = NULL;
99 SystemProperty* Arguments::_system_properties = NULL;
100 const char* Arguments::_gc_log_filename = NULL;
101 bool Arguments::_has_profile = false;
102 size_t Arguments::_conservative_max_heap_alignment = 0;
103 uintx Arguments::_min_heap_size = 0;
104 uintx Arguments::_min_heap_free_ratio = 0;
105 uintx Arguments::_max_heap_free_ratio = 0;
106 Arguments::Mode Arguments::_mode = _mixed;
107 bool Arguments::_java_compiler = false;
108 bool Arguments::_xdebug_mode = false;
109 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
110 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
111 int Arguments::_sun_java_launcher_pid = -1;
112 bool Arguments::_created_by_gamma_launcher = false;
114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
115 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
116 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
117 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
118 bool Arguments::_ClipInlining = ClipInlining;
120 char* Arguments::SharedArchivePath = NULL;
122 AgentLibraryList Arguments::_libraryList;
123 AgentLibraryList Arguments::_agentList;
125 abort_hook_t Arguments::_abort_hook = NULL;
126 exit_hook_t Arguments::_exit_hook = NULL;
127 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
130 SystemProperty *Arguments::_java_ext_dirs = NULL;
131 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
132 SystemProperty *Arguments::_sun_boot_library_path = NULL;
133 SystemProperty *Arguments::_java_library_path = NULL;
134 SystemProperty *Arguments::_java_home = NULL;
135 SystemProperty *Arguments::_java_class_path = NULL;
136 SystemProperty *Arguments::_sun_boot_class_path = NULL;
138 char* Arguments::_meta_index_path = NULL;
139 char* Arguments::_meta_index_dir = NULL;
141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
143 static bool match_option(const JavaVMOption *option, const char* name,
144 const char** tail) {
145 int len = (int)strlen(name);
146 if (strncmp(option->optionString, name, len) == 0) {
147 *tail = option->optionString + len;
148 return true;
149 } else {
150 return false;
151 }
152 }
154 static void logOption(const char* opt) {
155 if (PrintVMOptions) {
156 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
157 }
158 }
160 // Process java launcher properties.
161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
162 // See if sun.java.launcher or sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
174 _sun_java_launcher_pid = atoi(tail);
175 continue;
176 }
177 }
178 }
180 // Initialize system properties key and value.
181 void Arguments::init_system_properties() {
183 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
184 "Java Virtual Machine Specification", false));
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
189 // following are JVMTI agent writeable properties.
190 // Properties values are set to NULL and they are
191 // os specific they are initialized in os::init_system_properties_values().
192 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
193 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
194 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
195 _java_library_path = new SystemProperty("java.library.path", NULL, true);
196 _java_home = new SystemProperty("java.home", NULL, true);
197 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
199 _java_class_path = new SystemProperty("java.class.path", "", true);
201 // Add to System Property list.
202 PropertyList_add(&_system_properties, _java_ext_dirs);
203 PropertyList_add(&_system_properties, _java_endorsed_dirs);
204 PropertyList_add(&_system_properties, _sun_boot_library_path);
205 PropertyList_add(&_system_properties, _java_library_path);
206 PropertyList_add(&_system_properties, _java_home);
207 PropertyList_add(&_system_properties, _java_class_path);
208 PropertyList_add(&_system_properties, _sun_boot_class_path);
210 // Set OS specific system properties values
211 os::init_system_properties_values();
212 }
215 // Update/Initialize System properties after JDK version number is known
216 void Arguments::init_version_specific_system_properties() {
217 enum { bufsz = 16 };
218 char buffer[bufsz];
219 const char* spec_vendor = "Sun Microsystems Inc.";
220 uint32_t spec_version = 0;
222 if (JDK_Version::is_gte_jdk17x_version()) {
223 spec_vendor = "Oracle Corporation";
224 spec_version = JDK_Version::current().major_version();
225 }
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 */
244 typedef struct {
245 const char* name;
246 JDK_Version obsoleted_in; // when the flag went away
247 JDK_Version accept_until; // which version to start denying the existence
248 } ObsoleteFlag;
250 static ObsoleteFlag obsolete_jvm_flags[] = {
251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
266 { "DefaultInitialRAMFraction",
267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "UseDepthFirstScavengeOrder",
269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
270 { "HandlePromotionFailure",
271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
272 { "MaxLiveObjectEvacuationRatio",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
275 { "UseParallelOldGCCompacting",
276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
277 { "UseParallelDensePrefixUpdate",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelOldGCDensePrefix",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 #ifdef PRODUCT
305 { "DesiredMethodLimit",
306 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
307 #endif // PRODUCT
308 { NULL, JDK_Version(0), JDK_Version(0) }
309 };
311 // Returns true if the flag is obsolete and fits into the range specified
312 // for being ignored. In the case that the flag is ignored, the 'version'
313 // value is filled in with the version number when the flag became
314 // obsolete so that that value can be displayed to the user.
315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
316 int i = 0;
317 assert(version != NULL, "Must provide a version buffer");
318 while (obsolete_jvm_flags[i].name != NULL) {
319 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
320 // <flag>=xxx form
321 // [-|+]<flag> form
322 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
323 ((s[0] == '+' || s[0] == '-') &&
324 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
325 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
326 *version = flag_status.obsoleted_in;
327 return true;
328 }
329 }
330 i++;
331 }
332 return false;
333 }
335 // Constructs the system class path (aka boot class path) from the following
336 // components, in order:
337 //
338 // prefix // from -Xbootclasspath/p:...
339 // endorsed // the expansion of -Djava.endorsed.dirs=...
340 // base // from os::get_system_properties() or -Xbootclasspath=
341 // suffix // from -Xbootclasspath/a:...
342 //
343 // java.endorsed.dirs is a list of directories; any jar or zip files in the
344 // directories are added to the sysclasspath just before the base.
345 //
346 // This could be AllStatic, but it isn't needed after argument processing is
347 // complete.
348 class SysClassPath: public StackObj {
349 public:
350 SysClassPath(const char* base);
351 ~SysClassPath();
353 inline void set_base(const char* base);
354 inline void add_prefix(const char* prefix);
355 inline void add_suffix_to_prefix(const char* suffix);
356 inline void add_suffix(const char* suffix);
357 inline void reset_path(const char* base);
359 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
360 // property. Must be called after all command-line arguments have been
361 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
362 // combined_path().
363 void expand_endorsed();
365 inline const char* get_base() const { return _items[_scp_base]; }
366 inline const char* get_prefix() const { return _items[_scp_prefix]; }
367 inline const char* get_suffix() const { return _items[_scp_suffix]; }
368 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
370 // Combine all the components into a single c-heap-allocated string; caller
371 // must free the string if/when no longer needed.
372 char* combined_path();
374 private:
375 // Utility routines.
376 static char* add_to_path(const char* path, const char* str, bool prepend);
377 static char* add_jars_to_path(char* path, const char* directory);
379 inline void reset_item_at(int index);
381 // Array indices for the items that make up the sysclasspath. All except the
382 // base are allocated in the C heap and freed by this class.
383 enum {
384 _scp_prefix, // from -Xbootclasspath/p:...
385 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
386 _scp_base, // the default sysclasspath
387 _scp_suffix, // from -Xbootclasspath/a:...
388 _scp_nitems // the number of items, must be last.
389 };
391 const char* _items[_scp_nitems];
392 DEBUG_ONLY(bool _expansion_done;)
393 };
395 SysClassPath::SysClassPath(const char* base) {
396 memset(_items, 0, sizeof(_items));
397 _items[_scp_base] = base;
398 DEBUG_ONLY(_expansion_done = false;)
399 }
401 SysClassPath::~SysClassPath() {
402 // Free everything except the base.
403 for (int i = 0; i < _scp_nitems; ++i) {
404 if (i != _scp_base) reset_item_at(i);
405 }
406 DEBUG_ONLY(_expansion_done = false;)
407 }
409 inline void SysClassPath::set_base(const char* base) {
410 _items[_scp_base] = base;
411 }
413 inline void SysClassPath::add_prefix(const char* prefix) {
414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
415 }
417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
419 }
421 inline void SysClassPath::add_suffix(const char* suffix) {
422 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
423 }
425 inline void SysClassPath::reset_item_at(int index) {
426 assert(index < _scp_nitems && index != _scp_base, "just checking");
427 if (_items[index] != NULL) {
428 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
429 _items[index] = NULL;
430 }
431 }
433 inline void SysClassPath::reset_path(const char* base) {
434 // Clear the prefix and suffix.
435 reset_item_at(_scp_prefix);
436 reset_item_at(_scp_suffix);
437 set_base(base);
438 }
440 //------------------------------------------------------------------------------
442 void SysClassPath::expand_endorsed() {
443 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
445 const char* path = Arguments::get_property("java.endorsed.dirs");
446 if (path == NULL) {
447 path = Arguments::get_endorsed_dir();
448 assert(path != NULL, "no default for java.endorsed.dirs");
449 }
451 char* expanded_path = NULL;
452 const char separator = *os::path_separator();
453 const char* const end = path + strlen(path);
454 while (path < end) {
455 const char* tmp_end = strchr(path, separator);
456 if (tmp_end == NULL) {
457 expanded_path = add_jars_to_path(expanded_path, path);
458 path = end;
459 } else {
460 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
461 memcpy(dirpath, path, tmp_end - path);
462 dirpath[tmp_end - path] = '\0';
463 expanded_path = add_jars_to_path(expanded_path, dirpath);
464 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
465 path = tmp_end + 1;
466 }
467 }
468 _items[_scp_endorsed] = expanded_path;
469 DEBUG_ONLY(_expansion_done = true;)
470 }
472 // Combine the bootclasspath elements, some of which may be null, into a single
473 // c-heap-allocated string.
474 char* SysClassPath::combined_path() {
475 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
476 assert(_expansion_done, "must call expand_endorsed() first.");
478 size_t lengths[_scp_nitems];
479 size_t total_len = 0;
481 const char separator = *os::path_separator();
483 // Get the lengths.
484 int i;
485 for (i = 0; i < _scp_nitems; ++i) {
486 if (_items[i] != NULL) {
487 lengths[i] = strlen(_items[i]);
488 // Include space for the separator char (or a NULL for the last item).
489 total_len += lengths[i] + 1;
490 }
491 }
492 assert(total_len > 0, "empty sysclasspath not allowed");
494 // Copy the _items to a single string.
495 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
496 char* cp_tmp = cp;
497 for (i = 0; i < _scp_nitems; ++i) {
498 if (_items[i] != NULL) {
499 memcpy(cp_tmp, _items[i], lengths[i]);
500 cp_tmp += lengths[i];
501 *cp_tmp++ = separator;
502 }
503 }
504 *--cp_tmp = '\0'; // Replace the extra separator.
505 return cp;
506 }
508 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
509 char*
510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
511 char *cp;
513 assert(str != NULL, "just checking");
514 if (path == NULL) {
515 size_t len = strlen(str) + 1;
516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
517 memcpy(cp, str, len); // copy the trailing null
518 } else {
519 const char separator = *os::path_separator();
520 size_t old_len = strlen(path);
521 size_t str_len = strlen(str);
522 size_t len = old_len + str_len + 2;
524 if (prepend) {
525 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
526 char* cp_tmp = cp;
527 memcpy(cp_tmp, str, str_len);
528 cp_tmp += str_len;
529 *cp_tmp = separator;
530 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
531 FREE_C_HEAP_ARRAY(char, path, mtInternal);
532 } else {
533 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
534 char* cp_tmp = cp + old_len;
535 *cp_tmp = separator;
536 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
537 }
538 }
539 return cp;
540 }
542 // Scan the directory and append any jar or zip files found to path.
543 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
545 DIR* dir = os::opendir(directory);
546 if (dir == NULL) return path;
548 char dir_sep[2] = { '\0', '\0' };
549 size_t directory_len = strlen(directory);
550 const char fileSep = *os::file_separator();
551 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
553 /* Scan the directory for jars/zips, appending them to path. */
554 struct dirent *entry;
555 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
556 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
557 const char* name = entry->d_name;
558 const char* ext = name + strlen(name) - 4;
559 bool isJarOrZip = ext > name &&
560 (os::file_name_strcmp(ext, ".jar") == 0 ||
561 os::file_name_strcmp(ext, ".zip") == 0);
562 if (isJarOrZip) {
563 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
564 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
565 path = add_to_path(path, jarpath, false);
566 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
567 }
568 }
569 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
570 os::closedir(dir);
571 return path;
572 }
574 // Parses a memory size specification string.
575 static bool atomull(const char *s, julong* result) {
576 julong n = 0;
577 int args_read = sscanf(s, JULONG_FORMAT, &n);
578 if (args_read != 1) {
579 return false;
580 }
581 while (*s != '\0' && isdigit(*s)) {
582 s++;
583 }
584 // 4705540: illegal if more characters are found after the first non-digit
585 if (strlen(s) > 1) {
586 return false;
587 }
588 switch (*s) {
589 case 'T': case 't':
590 *result = n * G * K;
591 // Check for overflow.
592 if (*result/((julong)G * K) != n) return false;
593 return true;
594 case 'G': case 'g':
595 *result = n * G;
596 if (*result/G != n) return false;
597 return true;
598 case 'M': case 'm':
599 *result = n * M;
600 if (*result/M != n) return false;
601 return true;
602 case 'K': case 'k':
603 *result = n * K;
604 if (*result/K != n) return false;
605 return true;
606 case '\0':
607 *result = n;
608 return true;
609 default:
610 return false;
611 }
612 }
614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
615 if (size < min_size) return arg_too_small;
616 // Check that size will fit in a size_t (only relevant on 32-bit)
617 if (size > max_uintx) return arg_too_big;
618 return arg_in_range;
619 }
621 // Describe an argument out of range error
622 void Arguments::describe_range_error(ArgsRange errcode) {
623 switch(errcode) {
624 case arg_too_big:
625 jio_fprintf(defaultStream::error_stream(),
626 "The specified size exceeds the maximum "
627 "representable size.\n");
628 break;
629 case arg_too_small:
630 case arg_unreadable:
631 case arg_in_range:
632 // do nothing for now
633 break;
634 default:
635 ShouldNotReachHere();
636 }
637 }
639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
640 return CommandLineFlags::boolAtPut(name, &value, origin);
641 }
643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
644 double v;
645 if (sscanf(value, "%lf", &v) != 1) {
646 return false;
647 }
649 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
650 return true;
651 }
652 return false;
653 }
655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
656 julong v;
657 intx intx_v;
658 bool is_neg = false;
659 // Check the sign first since atomull() parses only unsigned values.
660 if (*value == '-') {
661 if (!CommandLineFlags::intxAt(name, &intx_v)) {
662 return false;
663 }
664 value++;
665 is_neg = true;
666 }
667 if (!atomull(value, &v)) {
668 return false;
669 }
670 intx_v = (intx) v;
671 if (is_neg) {
672 intx_v = -intx_v;
673 }
674 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
675 return true;
676 }
677 uintx uintx_v = (uintx) v;
678 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
679 return true;
680 }
681 uint64_t uint64_t_v = (uint64_t) v;
682 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
683 return true;
684 }
685 return false;
686 }
688 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
689 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
690 // Contract: CommandLineFlags always returns a pointer that needs freeing.
691 FREE_C_HEAP_ARRAY(char, value, mtInternal);
692 return true;
693 }
695 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
696 const char* old_value = "";
697 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
698 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
699 size_t new_len = strlen(new_value);
700 const char* value;
701 char* free_this_too = NULL;
702 if (old_len == 0) {
703 value = new_value;
704 } else if (new_len == 0) {
705 value = old_value;
706 } else {
707 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
708 // each new setting adds another LINE to the switch:
709 sprintf(buf, "%s\n%s", old_value, new_value);
710 value = buf;
711 free_this_too = buf;
712 }
713 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
714 // CommandLineFlags always returns a pointer that needs freeing.
715 FREE_C_HEAP_ARRAY(char, value, mtInternal);
716 if (free_this_too != NULL) {
717 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
718 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
719 }
720 return true;
721 }
723 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
725 // range of acceptable characters spelled out for portability reasons
726 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
727 #define BUFLEN 255
728 char name[BUFLEN+1];
729 char dummy;
731 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
732 return set_bool_flag(name, false, origin);
733 }
734 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
735 return set_bool_flag(name, true, origin);
736 }
738 char punct;
739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
740 const char* value = strchr(arg, '=') + 1;
741 Flag* flag = Flag::find_flag(name, strlen(name));
742 if (flag != NULL && flag->is_ccstr()) {
743 if (flag->ccstr_accumulates()) {
744 return append_to_string_flag(name, value, origin);
745 } else {
746 if (value[0] == '\0') {
747 value = NULL;
748 }
749 return set_string_flag(name, value, origin);
750 }
751 }
752 }
754 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
755 const char* value = strchr(arg, '=') + 1;
756 // -XX:Foo:=xxx will reset the string flag to the given value.
757 if (value[0] == '\0') {
758 value = NULL;
759 }
760 return set_string_flag(name, value, origin);
761 }
763 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
764 #define SIGNED_NUMBER_RANGE "[-0123456789]"
765 #define NUMBER_RANGE "[0123456789]"
766 char value[BUFLEN + 1];
767 char value2[BUFLEN + 1];
768 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
769 // Looks like a floating-point number -- try again with more lenient format string
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
771 return set_fp_numeric_flag(name, value, origin);
772 }
773 }
775 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
777 return set_numeric_flag(name, value, origin);
778 }
780 return false;
781 }
783 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
784 assert(bldarray != NULL, "illegal argument");
786 if (arg == NULL) {
787 return;
788 }
790 int new_count = *count + 1;
792 // expand the array and add arg to the last element
793 if (*bldarray == NULL) {
794 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
795 } else {
796 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
797 }
798 (*bldarray)[*count] = strdup(arg);
799 *count = new_count;
800 }
802 void Arguments::build_jvm_args(const char* arg) {
803 add_string(&_jvm_args_array, &_num_jvm_args, arg);
804 }
806 void Arguments::build_jvm_flags(const char* arg) {
807 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
808 }
810 // utility function to return a string that concatenates all
811 // strings in a given char** array
812 const char* Arguments::build_resource_string(char** args, int count) {
813 if (args == NULL || count == 0) {
814 return NULL;
815 }
816 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
817 for (int i = 1; i < count; i++) {
818 length += strlen(args[i]) + 1; // add 1 for a space
819 }
820 char* s = NEW_RESOURCE_ARRAY(char, length);
821 strcpy(s, args[0]);
822 for (int j = 1; j < count; j++) {
823 strcat(s, " ");
824 strcat(s, args[j]);
825 }
826 return (const char*) s;
827 }
829 void Arguments::print_on(outputStream* st) {
830 st->print_cr("VM Arguments:");
831 if (num_jvm_flags() > 0) {
832 st->print("jvm_flags: "); print_jvm_flags_on(st);
833 }
834 if (num_jvm_args() > 0) {
835 st->print("jvm_args: "); print_jvm_args_on(st);
836 }
837 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
838 if (_java_class_path != NULL) {
839 char* path = _java_class_path->value();
840 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
841 }
842 st->print_cr("Launcher Type: %s", _sun_java_launcher);
843 }
845 void Arguments::print_jvm_flags_on(outputStream* st) {
846 if (_num_jvm_flags > 0) {
847 for (int i=0; i < _num_jvm_flags; i++) {
848 st->print("%s ", _jvm_flags_array[i]);
849 }
850 st->cr();
851 }
852 }
854 void Arguments::print_jvm_args_on(outputStream* st) {
855 if (_num_jvm_args > 0) {
856 for (int i=0; i < _num_jvm_args; i++) {
857 st->print("%s ", _jvm_args_array[i]);
858 }
859 st->cr();
860 }
861 }
863 bool Arguments::process_argument(const char* arg,
864 jboolean ignore_unrecognized, Flag::Flags origin) {
866 JDK_Version since = JDK_Version();
868 if (parse_argument(arg, origin) || ignore_unrecognized) {
869 return true;
870 }
872 bool has_plus_minus = (*arg == '+' || *arg == '-');
873 const char* const argname = has_plus_minus ? arg + 1 : arg;
874 if (is_newly_obsolete(arg, &since)) {
875 char version[256];
876 since.to_string(version, sizeof(version));
877 warning("ignoring option %s; support was removed in %s", argname, version);
878 return true;
879 }
881 // For locked flags, report a custom error message if available.
882 // Otherwise, report the standard unrecognized VM option.
884 size_t arg_len;
885 const char* equal_sign = strchr(argname, '=');
886 if (equal_sign == NULL) {
887 arg_len = strlen(argname);
888 } else {
889 arg_len = equal_sign - argname;
890 }
892 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
893 if (found_flag != NULL) {
894 char locked_message_buf[BUFLEN];
895 found_flag->get_locked_message(locked_message_buf, BUFLEN);
896 if (strlen(locked_message_buf) == 0) {
897 if (found_flag->is_bool() && !has_plus_minus) {
898 jio_fprintf(defaultStream::error_stream(),
899 "Missing +/- setting for VM option '%s'\n", argname);
900 } else if (!found_flag->is_bool() && has_plus_minus) {
901 jio_fprintf(defaultStream::error_stream(),
902 "Unexpected +/- setting in VM option '%s'\n", argname);
903 } else {
904 jio_fprintf(defaultStream::error_stream(),
905 "Improperly specified VM option '%s'\n", argname);
906 }
907 } else {
908 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
909 }
910 } else {
911 jio_fprintf(defaultStream::error_stream(),
912 "Unrecognized VM option '%s'\n", argname);
913 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
914 if (fuzzy_matched != NULL) {
915 jio_fprintf(defaultStream::error_stream(),
916 "Did you mean '%s%s%s'?\n",
917 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
918 fuzzy_matched->_name,
919 (fuzzy_matched->is_bool()) ? "" : "=<value>");
920 }
921 }
923 // allow for commandline "commenting out" options like -XX:#+Verbose
924 return arg[0] == '#';
925 }
927 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
928 FILE* stream = fopen(file_name, "rb");
929 if (stream == NULL) {
930 if (should_exist) {
931 jio_fprintf(defaultStream::error_stream(),
932 "Could not open settings file %s\n", file_name);
933 return false;
934 } else {
935 return true;
936 }
937 }
939 char token[1024];
940 int pos = 0;
942 bool in_white_space = true;
943 bool in_comment = false;
944 bool in_quote = false;
945 char quote_c = 0;
946 bool result = true;
948 int c = getc(stream);
949 while(c != EOF && pos < (int)(sizeof(token)-1)) {
950 if (in_white_space) {
951 if (in_comment) {
952 if (c == '\n') in_comment = false;
953 } else {
954 if (c == '#') in_comment = true;
955 else if (!isspace(c)) {
956 in_white_space = false;
957 token[pos++] = c;
958 }
959 }
960 } else {
961 if (c == '\n' || (!in_quote && isspace(c))) {
962 // token ends at newline, or at unquoted whitespace
963 // this allows a way to include spaces in string-valued options
964 token[pos] = '\0';
965 logOption(token);
966 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
967 build_jvm_flags(token);
968 pos = 0;
969 in_white_space = true;
970 in_quote = false;
971 } else if (!in_quote && (c == '\'' || c == '"')) {
972 in_quote = true;
973 quote_c = c;
974 } else if (in_quote && (c == quote_c)) {
975 in_quote = false;
976 } else {
977 token[pos++] = c;
978 }
979 }
980 c = getc(stream);
981 }
982 if (pos > 0) {
983 token[pos] = '\0';
984 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
985 build_jvm_flags(token);
986 }
987 fclose(stream);
988 return result;
989 }
991 //=============================================================================================================
992 // Parsing of properties (-D)
994 const char* Arguments::get_property(const char* key) {
995 return PropertyList_get_value(system_properties(), key);
996 }
998 bool Arguments::add_property(const char* prop) {
999 const char* eq = strchr(prop, '=');
1000 char* key;
1001 // ns must be static--its address may be stored in a SystemProperty object.
1002 const static char ns[1] = {0};
1003 char* value = (char *)ns;
1005 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1006 key = AllocateHeap(key_len + 1, mtInternal);
1007 strncpy(key, prop, key_len);
1008 key[key_len] = '\0';
1010 if (eq != NULL) {
1011 size_t value_len = strlen(prop) - key_len - 1;
1012 value = AllocateHeap(value_len + 1, mtInternal);
1013 strncpy(value, &prop[key_len + 1], value_len + 1);
1014 }
1016 if (strcmp(key, "java.compiler") == 0) {
1017 process_java_compiler_argument(value);
1018 FreeHeap(key);
1019 if (eq != NULL) {
1020 FreeHeap(value);
1021 }
1022 return true;
1023 } else if (strcmp(key, "sun.java.command") == 0) {
1024 _java_command = value;
1026 // Record value in Arguments, but let it get passed to Java.
1027 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1028 // launcher.pid property is private and is processed
1029 // in process_sun_java_launcher_properties();
1030 // the sun.java.launcher property is passed on to the java application
1031 FreeHeap(key);
1032 if (eq != NULL) {
1033 FreeHeap(value);
1034 }
1035 return true;
1036 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1037 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1038 // its value without going through the property list or making a Java call.
1039 _java_vendor_url_bug = value;
1040 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1041 PropertyList_unique_add(&_system_properties, key, value, true);
1042 return true;
1043 }
1044 // Create new property and add at the end of the list
1045 PropertyList_unique_add(&_system_properties, key, value);
1046 return true;
1047 }
1049 //===========================================================================================================
1050 // Setting int/mixed/comp mode flags
1052 void Arguments::set_mode_flags(Mode mode) {
1053 // Set up default values for all flags.
1054 // If you add a flag to any of the branches below,
1055 // add a default value for it here.
1056 set_java_compiler(false);
1057 _mode = mode;
1059 // Ensure Agent_OnLoad has the correct initial values.
1060 // This may not be the final mode; mode may change later in onload phase.
1061 PropertyList_unique_add(&_system_properties, "java.vm.info",
1062 (char*)VM_Version::vm_info_string(), false);
1064 UseInterpreter = true;
1065 UseCompiler = true;
1066 UseLoopCounter = true;
1068 #ifndef ZERO
1069 // Turn these off for mixed and comp. Leave them on for Zero.
1070 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1071 UseFastAccessorMethods = (mode == _int);
1072 }
1073 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1074 UseFastEmptyMethods = (mode == _int);
1075 }
1076 #endif
1078 // Default values may be platform/compiler dependent -
1079 // use the saved values
1080 ClipInlining = Arguments::_ClipInlining;
1081 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1082 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1083 BackgroundCompilation = Arguments::_BackgroundCompilation;
1085 // Change from defaults based on mode
1086 switch (mode) {
1087 default:
1088 ShouldNotReachHere();
1089 break;
1090 case _int:
1091 UseCompiler = false;
1092 UseLoopCounter = false;
1093 AlwaysCompileLoopMethods = false;
1094 UseOnStackReplacement = false;
1095 break;
1096 case _mixed:
1097 // same as default
1098 break;
1099 case _comp:
1100 UseInterpreter = false;
1101 BackgroundCompilation = false;
1102 ClipInlining = false;
1103 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1104 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1105 // compile a level 4 (C2) and then continue executing it.
1106 if (TieredCompilation) {
1107 Tier3InvokeNotifyFreqLog = 0;
1108 Tier4InvocationThreshold = 0;
1109 }
1110 break;
1111 }
1112 }
1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1115 // Conflict: required to use shared spaces (-Xshare:on), but
1116 // incompatible command line options were chosen.
1118 static void no_shared_spaces(const char* message) {
1119 if (RequireSharedSpaces) {
1120 jio_fprintf(defaultStream::error_stream(),
1121 "Class data sharing is inconsistent with other specified options.\n");
1122 vm_exit_during_initialization("Unable to use shared archive.", message);
1123 } else {
1124 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1125 }
1126 }
1127 #endif
1129 void Arguments::set_tiered_flags() {
1130 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1131 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1132 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1133 }
1134 if (CompilationPolicyChoice < 2) {
1135 vm_exit_during_initialization(
1136 "Incompatible compilation policy selected", NULL);
1137 }
1138 // Increase the code cache size - tiered compiles a lot more.
1139 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1140 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1141 }
1142 if (!UseInterpreter) { // -Xcomp
1143 Tier3InvokeNotifyFreqLog = 0;
1144 Tier4InvocationThreshold = 0;
1145 }
1146 }
1148 #if INCLUDE_ALL_GCS
1149 static void disable_adaptive_size_policy(const char* collector_name) {
1150 if (UseAdaptiveSizePolicy) {
1151 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1152 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1153 collector_name);
1154 }
1155 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1156 }
1157 }
1159 void Arguments::set_parnew_gc_flags() {
1160 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1161 "control point invariant");
1162 assert(UseParNewGC, "Error");
1164 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1165 disable_adaptive_size_policy("UseParNewGC");
1167 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1168 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1169 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1170 } else if (ParallelGCThreads == 0) {
1171 jio_fprintf(defaultStream::error_stream(),
1172 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1173 vm_exit(1);
1174 }
1176 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1177 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1178 // we set them to 1024 and 1024.
1179 // See CR 6362902.
1180 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1181 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1182 }
1183 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1184 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1185 }
1187 // AlwaysTenure flag should make ParNew promote all at first collection.
1188 // See CR 6362902.
1189 if (AlwaysTenure) {
1190 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1191 }
1192 // When using compressed oops, we use local overflow stacks,
1193 // rather than using a global overflow list chained through
1194 // the klass word of the object's pre-image.
1195 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1196 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1197 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1198 }
1199 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1200 }
1201 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1202 }
1204 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1205 // sparc/solaris for certain applications, but would gain from
1206 // further optimization and tuning efforts, and would almost
1207 // certainly gain from analysis of platform and environment.
1208 void Arguments::set_cms_and_parnew_gc_flags() {
1209 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1210 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1212 // If we are using CMS, we prefer to UseParNewGC,
1213 // unless explicitly forbidden.
1214 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1215 FLAG_SET_ERGO(bool, UseParNewGC, true);
1216 }
1218 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1219 disable_adaptive_size_policy("UseConcMarkSweepGC");
1221 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1222 // as needed.
1223 if (UseParNewGC) {
1224 set_parnew_gc_flags();
1225 }
1227 size_t max_heap = align_size_down(MaxHeapSize,
1228 CardTableRS::ct_max_alignment_constraint());
1230 // Now make adjustments for CMS
1231 intx tenuring_default = (intx)6;
1232 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1234 // Preferred young gen size for "short" pauses:
1235 // upper bound depends on # of threads and NewRatio.
1236 const uintx parallel_gc_threads =
1237 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1238 const size_t preferred_max_new_size_unaligned =
1239 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1240 size_t preferred_max_new_size =
1241 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1243 // Unless explicitly requested otherwise, size young gen
1244 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1246 // If either MaxNewSize or NewRatio is set on the command line,
1247 // assume the user is trying to set the size of the young gen.
1248 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1250 // Set MaxNewSize to our calculated preferred_max_new_size unless
1251 // NewSize was set on the command line and it is larger than
1252 // preferred_max_new_size.
1253 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1254 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1255 } else {
1256 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1257 }
1258 if (PrintGCDetails && Verbose) {
1259 // Too early to use gclog_or_tty
1260 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1261 }
1263 // Code along this path potentially sets NewSize and OldSize
1264 if (PrintGCDetails && Verbose) {
1265 // Too early to use gclog_or_tty
1266 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1267 " initial_heap_size: " SIZE_FORMAT
1268 " max_heap: " SIZE_FORMAT,
1269 min_heap_size(), InitialHeapSize, max_heap);
1270 }
1271 size_t min_new = preferred_max_new_size;
1272 if (FLAG_IS_CMDLINE(NewSize)) {
1273 min_new = NewSize;
1274 }
1275 if (max_heap > min_new && min_heap_size() > min_new) {
1276 // Unless explicitly requested otherwise, make young gen
1277 // at least min_new, and at most preferred_max_new_size.
1278 if (FLAG_IS_DEFAULT(NewSize)) {
1279 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1280 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1281 if (PrintGCDetails && Verbose) {
1282 // Too early to use gclog_or_tty
1283 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1284 }
1285 }
1286 // Unless explicitly requested otherwise, size old gen
1287 // so it's NewRatio x of NewSize.
1288 if (FLAG_IS_DEFAULT(OldSize)) {
1289 if (max_heap > NewSize) {
1290 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1291 if (PrintGCDetails && Verbose) {
1292 // Too early to use gclog_or_tty
1293 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1294 }
1295 }
1296 }
1297 }
1298 }
1299 // Unless explicitly requested otherwise, definitely
1300 // promote all objects surviving "tenuring_default" scavenges.
1301 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1302 FLAG_IS_DEFAULT(SurvivorRatio)) {
1303 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1304 }
1305 // If we decided above (or user explicitly requested)
1306 // `promote all' (via MaxTenuringThreshold := 0),
1307 // prefer minuscule survivor spaces so as not to waste
1308 // space for (non-existent) survivors
1309 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1310 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1311 }
1312 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1313 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1314 // This is done in order to make ParNew+CMS configuration to work
1315 // with YoungPLABSize and OldPLABSize options.
1316 // See CR 6362902.
1317 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1318 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1319 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1320 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1321 // the value (either from the command line or ergonomics) of
1322 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1323 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1324 } else {
1325 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1326 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1327 // we'll let it to take precedence.
1328 jio_fprintf(defaultStream::error_stream(),
1329 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1330 " options are specified for the CMS collector."
1331 " CMSParPromoteBlocksToClaim will take precedence.\n");
1332 }
1333 }
1334 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1335 // OldPLAB sizing manually turned off: Use a larger default setting,
1336 // unless it was manually specified. This is because a too-low value
1337 // will slow down scavenges.
1338 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1339 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1340 }
1341 }
1342 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1343 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1344 // If either of the static initialization defaults have changed, note this
1345 // modification.
1346 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1347 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1348 }
1349 if (PrintGCDetails && Verbose) {
1350 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1351 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1352 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1353 }
1354 }
1355 #endif // INCLUDE_ALL_GCS
1357 void set_object_alignment() {
1358 // Object alignment.
1359 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1360 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1361 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1362 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1363 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1364 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1366 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1367 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1369 // Oop encoding heap max
1370 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1372 #if INCLUDE_ALL_GCS
1373 // Set CMS global values
1374 CompactibleFreeListSpace::set_cms_values();
1375 #endif // INCLUDE_ALL_GCS
1376 }
1378 bool verify_object_alignment() {
1379 // Object alignment.
1380 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1381 jio_fprintf(defaultStream::error_stream(),
1382 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1383 (int)ObjectAlignmentInBytes);
1384 return false;
1385 }
1386 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1387 jio_fprintf(defaultStream::error_stream(),
1388 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1389 (int)ObjectAlignmentInBytes, BytesPerLong);
1390 return false;
1391 }
1392 // It does not make sense to have big object alignment
1393 // since a space lost due to alignment will be greater
1394 // then a saved space from compressed oops.
1395 if ((int)ObjectAlignmentInBytes > 256) {
1396 jio_fprintf(defaultStream::error_stream(),
1397 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1398 (int)ObjectAlignmentInBytes);
1399 return false;
1400 }
1401 // In case page size is very small.
1402 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1403 jio_fprintf(defaultStream::error_stream(),
1404 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1405 (int)ObjectAlignmentInBytes, os::vm_page_size());
1406 return false;
1407 }
1408 if(SurvivorAlignmentInBytes == 0) {
1409 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1410 } else {
1411 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1412 jio_fprintf(defaultStream::error_stream(),
1413 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1414 (int)SurvivorAlignmentInBytes);
1415 return false;
1416 }
1417 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1418 jio_fprintf(defaultStream::error_stream(),
1419 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1420 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1421 return false;
1422 }
1423 }
1424 return true;
1425 }
1427 size_t Arguments::max_heap_for_compressed_oops() {
1428 // Avoid sign flip.
1429 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1430 // We need to fit both the NULL page and the heap into the memory budget, while
1431 // keeping alignment constraints of the heap. To guarantee the latter, as the
1432 // NULL page is located before the heap, we pad the NULL page to the conservative
1433 // maximum alignment that the GC may ever impose upon the heap.
1434 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1435 _conservative_max_heap_alignment);
1437 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1438 NOT_LP64(ShouldNotReachHere(); return 0);
1439 }
1441 bool Arguments::should_auto_select_low_pause_collector() {
1442 if (UseAutoGCSelectPolicy &&
1443 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1444 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1445 if (PrintGCDetails) {
1446 // Cannot use gclog_or_tty yet.
1447 tty->print_cr("Automatic selection of the low pause collector"
1448 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1449 }
1450 return true;
1451 }
1452 return false;
1453 }
1455 void Arguments::set_use_compressed_oops() {
1456 #ifndef ZERO
1457 #ifdef _LP64
1458 // MaxHeapSize is not set up properly at this point, but
1459 // the only value that can override MaxHeapSize if we are
1460 // to use UseCompressedOops is InitialHeapSize.
1461 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1463 if (max_heap_size <= max_heap_for_compressed_oops()) {
1464 #if !defined(COMPILER1) || defined(TIERED)
1465 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1466 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1467 }
1468 #endif
1469 #ifdef _WIN64
1470 if (UseLargePages && UseCompressedOops) {
1471 // Cannot allocate guard pages for implicit checks in indexed addressing
1472 // mode, when large pages are specified on windows.
1473 // This flag could be switched ON if narrow oop base address is set to 0,
1474 // see code in Universe::initialize_heap().
1475 Universe::set_narrow_oop_use_implicit_null_checks(false);
1476 }
1477 #endif // _WIN64
1478 } else {
1479 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1480 warning("Max heap size too large for Compressed Oops");
1481 FLAG_SET_DEFAULT(UseCompressedOops, false);
1482 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1483 }
1484 }
1485 #endif // _LP64
1486 #endif // ZERO
1487 }
1490 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1491 // set_use_compressed_oops().
1492 void Arguments::set_use_compressed_klass_ptrs() {
1493 #ifndef ZERO
1494 #ifdef _LP64
1495 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1496 if (!UseCompressedOops) {
1497 if (UseCompressedClassPointers) {
1498 warning("UseCompressedClassPointers requires UseCompressedOops");
1499 }
1500 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1501 } else {
1502 // Turn on UseCompressedClassPointers too
1503 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1504 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1505 }
1506 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1507 if (UseCompressedClassPointers) {
1508 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1509 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1510 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1511 }
1512 }
1513 }
1514 #endif // _LP64
1515 #endif // !ZERO
1516 }
1518 void Arguments::set_conservative_max_heap_alignment() {
1519 // The conservative maximum required alignment for the heap is the maximum of
1520 // the alignments imposed by several sources: any requirements from the heap
1521 // itself, the collector policy and the maximum page size we may run the VM
1522 // with.
1523 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1524 #if INCLUDE_ALL_GCS
1525 if (UseParallelGC) {
1526 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1527 } else if (UseG1GC) {
1528 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1529 }
1530 #endif // INCLUDE_ALL_GCS
1531 _conservative_max_heap_alignment = MAX4(heap_alignment,
1532 (size_t)os::vm_allocation_granularity(),
1533 os::max_page_size(),
1534 CollectorPolicy::compute_heap_alignment());
1535 }
1537 void Arguments::select_gc_ergonomically() {
1538 if (os::is_server_class_machine()) {
1539 if (should_auto_select_low_pause_collector()) {
1540 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1541 } else {
1542 FLAG_SET_ERGO(bool, UseParallelGC, true);
1543 }
1544 }
1545 }
1547 void Arguments::select_gc() {
1548 if (!gc_selected()) {
1549 ArgumentsExt::select_gc_ergonomically();
1550 }
1551 }
1553 void Arguments::set_ergonomics_flags() {
1554 select_gc();
1556 #ifdef COMPILER2
1557 // Shared spaces work fine with other GCs but causes bytecode rewriting
1558 // to be disabled, which hurts interpreter performance and decreases
1559 // server performance. When -server is specified, keep the default off
1560 // unless it is asked for. Future work: either add bytecode rewriting
1561 // at link time, or rewrite bytecodes in non-shared methods.
1562 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1563 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1564 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1565 }
1566 #endif
1568 set_conservative_max_heap_alignment();
1570 #ifndef ZERO
1571 #ifdef _LP64
1572 set_use_compressed_oops();
1574 // set_use_compressed_klass_ptrs() must be called after calling
1575 // set_use_compressed_oops().
1576 set_use_compressed_klass_ptrs();
1578 // Also checks that certain machines are slower with compressed oops
1579 // in vm_version initialization code.
1580 #endif // _LP64
1581 #endif // !ZERO
1582 }
1584 void Arguments::set_parallel_gc_flags() {
1585 assert(UseParallelGC || UseParallelOldGC, "Error");
1586 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1587 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1588 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1589 }
1590 FLAG_SET_DEFAULT(UseParallelGC, true);
1592 // If no heap maximum was requested explicitly, use some reasonable fraction
1593 // of the physical memory, up to a maximum of 1GB.
1594 FLAG_SET_DEFAULT(ParallelGCThreads,
1595 Abstract_VM_Version::parallel_worker_threads());
1596 if (ParallelGCThreads == 0) {
1597 jio_fprintf(defaultStream::error_stream(),
1598 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1599 vm_exit(1);
1600 }
1602 if (UseAdaptiveSizePolicy) {
1603 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1604 // unless the user actually sets these flags.
1605 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1606 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1607 _min_heap_free_ratio = MinHeapFreeRatio;
1608 }
1609 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1610 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1611 _max_heap_free_ratio = MaxHeapFreeRatio;
1612 }
1613 }
1615 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1616 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1617 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1618 // See CR 6362902 for details.
1619 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1620 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1621 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1622 }
1623 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1624 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1625 }
1626 }
1628 if (UseParallelOldGC) {
1629 // Par compact uses lower default values since they are treated as
1630 // minimums. These are different defaults because of the different
1631 // interpretation and are not ergonomically set.
1632 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1633 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1634 }
1635 }
1636 }
1638 void Arguments::set_g1_gc_flags() {
1639 assert(UseG1GC, "Error");
1640 #ifdef COMPILER1
1641 FastTLABRefill = false;
1642 #endif
1643 FLAG_SET_DEFAULT(ParallelGCThreads,
1644 Abstract_VM_Version::parallel_worker_threads());
1645 if (ParallelGCThreads == 0) {
1646 FLAG_SET_DEFAULT(ParallelGCThreads,
1647 Abstract_VM_Version::parallel_worker_threads());
1648 }
1650 #if INCLUDE_ALL_GCS
1651 if (G1ConcRefinementThreads == 0) {
1652 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1653 }
1654 #endif
1656 // MarkStackSize will be set (if it hasn't been set by the user)
1657 // when concurrent marking is initialized.
1658 // Its value will be based upon the number of parallel marking threads.
1659 // But we do set the maximum mark stack size here.
1660 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1661 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1662 }
1664 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1665 // In G1, we want the default GC overhead goal to be higher than
1666 // say in PS. So we set it here to 10%. Otherwise the heap might
1667 // be expanded more aggressively than we would like it to. In
1668 // fact, even 10% seems to not be high enough in some cases
1669 // (especially small GC stress tests that the main thing they do
1670 // is allocation). We might consider increase it further.
1671 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1672 }
1674 if (PrintGCDetails && Verbose) {
1675 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1676 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1677 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1678 }
1679 }
1681 #if !INCLUDE_ALL_GCS
1682 #ifdef ASSERT
1683 static bool verify_serial_gc_flags() {
1684 return (UseSerialGC &&
1685 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1686 UseParallelGC || UseParallelOldGC));
1687 }
1688 #endif // ASSERT
1689 #endif // INCLUDE_ALL_GCS
1691 void Arguments::set_gc_specific_flags() {
1692 #if INCLUDE_ALL_GCS
1693 // Set per-collector flags
1694 if (UseParallelGC || UseParallelOldGC) {
1695 set_parallel_gc_flags();
1696 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1697 set_cms_and_parnew_gc_flags();
1698 } else if (UseParNewGC) { // Skipped if CMS is set above
1699 set_parnew_gc_flags();
1700 } else if (UseG1GC) {
1701 set_g1_gc_flags();
1702 }
1703 check_deprecated_gcs();
1704 check_deprecated_gc_flags();
1705 if (AssumeMP && !UseSerialGC) {
1706 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1707 warning("If the number of processors is expected to increase from one, then"
1708 " you should configure the number of parallel GC threads appropriately"
1709 " using -XX:ParallelGCThreads=N");
1710 }
1711 }
1712 if (MinHeapFreeRatio == 100) {
1713 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1714 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1715 }
1716 #else // INCLUDE_ALL_GCS
1717 assert(verify_serial_gc_flags(), "SerialGC unset");
1718 #endif // INCLUDE_ALL_GCS
1719 }
1721 julong Arguments::limit_by_allocatable_memory(julong limit) {
1722 julong max_allocatable;
1723 julong result = limit;
1724 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1725 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1726 }
1727 return result;
1728 }
1730 void Arguments::set_heap_size() {
1731 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1732 // Deprecated flag
1733 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1734 }
1736 const julong phys_mem =
1737 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1738 : (julong)MaxRAM;
1740 // If the maximum heap size has not been set with -Xmx,
1741 // then set it as fraction of the size of physical memory,
1742 // respecting the maximum and minimum sizes of the heap.
1743 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1744 julong reasonable_max = phys_mem / MaxRAMFraction;
1746 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1747 // Small physical memory, so use a minimum fraction of it for the heap
1748 reasonable_max = phys_mem / MinRAMFraction;
1749 } else {
1750 // Not-small physical memory, so require a heap at least
1751 // as large as MaxHeapSize
1752 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1753 }
1754 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1755 // Limit the heap size to ErgoHeapSizeLimit
1756 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1757 }
1758 if (UseCompressedOops) {
1759 // Limit the heap size to the maximum possible when using compressed oops
1760 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1761 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1762 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1763 // but it should be not less than default MaxHeapSize.
1764 max_coop_heap -= HeapBaseMinAddress;
1765 }
1766 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1767 }
1768 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1770 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1771 // An initial heap size was specified on the command line,
1772 // so be sure that the maximum size is consistent. Done
1773 // after call to limit_by_allocatable_memory because that
1774 // method might reduce the allocation size.
1775 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1776 }
1778 if (PrintGCDetails && Verbose) {
1779 // Cannot use gclog_or_tty yet.
1780 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1781 }
1782 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1783 }
1785 // If the minimum or initial heap_size have not been set or requested to be set
1786 // ergonomically, set them accordingly.
1787 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1788 julong reasonable_minimum = (julong)(OldSize + NewSize);
1790 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1792 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1794 if (InitialHeapSize == 0) {
1795 julong reasonable_initial = phys_mem / InitialRAMFraction;
1797 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1798 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1800 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1802 if (PrintGCDetails && Verbose) {
1803 // Cannot use gclog_or_tty yet.
1804 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1805 }
1806 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1807 }
1808 // If the minimum heap size has not been set (via -Xms),
1809 // synchronize with InitialHeapSize to avoid errors with the default value.
1810 if (min_heap_size() == 0) {
1811 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1812 if (PrintGCDetails && Verbose) {
1813 // Cannot use gclog_or_tty yet.
1814 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1815 }
1816 }
1817 }
1818 }
1820 // This must be called after ergonomics because we want bytecode rewriting
1821 // if the server compiler is used, or if UseSharedSpaces is disabled.
1822 void Arguments::set_bytecode_flags() {
1823 // Better not attempt to store into a read-only space.
1824 if (UseSharedSpaces) {
1825 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1826 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1827 }
1829 if (!RewriteBytecodes) {
1830 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1831 }
1832 }
1834 // Aggressive optimization flags -XX:+AggressiveOpts
1835 void Arguments::set_aggressive_opts_flags() {
1836 #ifdef COMPILER2
1837 if (AggressiveUnboxing) {
1838 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1839 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1840 } else if (!EliminateAutoBox) {
1841 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1842 AggressiveUnboxing = false;
1843 }
1844 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1845 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1846 } else if (!DoEscapeAnalysis) {
1847 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1848 AggressiveUnboxing = false;
1849 }
1850 }
1851 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1852 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1853 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1854 }
1855 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1856 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1857 }
1859 // Feed the cache size setting into the JDK
1860 char buffer[1024];
1861 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1862 add_property(buffer);
1863 }
1864 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1865 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1866 }
1867 #endif
1869 if (AggressiveOpts) {
1870 // Sample flag setting code
1871 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1872 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1873 // }
1874 }
1875 }
1877 //===========================================================================================================
1878 // Parsing of java.compiler property
1880 void Arguments::process_java_compiler_argument(char* arg) {
1881 // For backwards compatibility, Djava.compiler=NONE or ""
1882 // causes us to switch to -Xint mode UNLESS -Xdebug
1883 // is also specified.
1884 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1885 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1886 }
1887 }
1889 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1890 _sun_java_launcher = strdup(launcher);
1891 if (strcmp("gamma", _sun_java_launcher) == 0) {
1892 _created_by_gamma_launcher = true;
1893 }
1894 }
1896 bool Arguments::created_by_java_launcher() {
1897 assert(_sun_java_launcher != NULL, "property must have value");
1898 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1899 }
1901 bool Arguments::created_by_gamma_launcher() {
1902 return _created_by_gamma_launcher;
1903 }
1905 //===========================================================================================================
1906 // Parsing of main arguments
1908 bool Arguments::verify_interval(uintx val, uintx min,
1909 uintx max, const char* name) {
1910 // Returns true iff value is in the inclusive interval [min..max]
1911 // false, otherwise.
1912 if (val >= min && val <= max) {
1913 return true;
1914 }
1915 jio_fprintf(defaultStream::error_stream(),
1916 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1917 " and " UINTX_FORMAT "\n",
1918 name, val, min, max);
1919 return false;
1920 }
1922 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1923 // Returns true if given value is at least specified min threshold
1924 // false, otherwise.
1925 if (val >= min ) {
1926 return true;
1927 }
1928 jio_fprintf(defaultStream::error_stream(),
1929 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1930 name, val, min);
1931 return false;
1932 }
1934 bool Arguments::verify_percentage(uintx value, const char* name) {
1935 if (is_percentage(value)) {
1936 return true;
1937 }
1938 jio_fprintf(defaultStream::error_stream(),
1939 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1940 name, value);
1941 return false;
1942 }
1944 // check if do gclog rotation
1945 // +UseGCLogFileRotation is a must,
1946 // no gc log rotation when log file not supplied or
1947 // NumberOfGCLogFiles is 0
1948 void check_gclog_consistency() {
1949 if (UseGCLogFileRotation) {
1950 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1951 jio_fprintf(defaultStream::output_stream(),
1952 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1953 "where num_of_file > 0\n"
1954 "GC log rotation is turned off\n");
1955 UseGCLogFileRotation = false;
1956 }
1957 }
1959 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1960 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1961 jio_fprintf(defaultStream::output_stream(),
1962 "GCLogFileSize changed to minimum 8K\n");
1963 }
1964 }
1966 // This function is called for -Xloggc:<filename>, it can be used
1967 // to check if a given file name(or string) conforms to the following
1968 // specification:
1969 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1970 // %p and %t only allowed once. We only limit usage of filename not path
1971 bool is_filename_valid(const char *file_name) {
1972 const char* p = file_name;
1973 char file_sep = os::file_separator()[0];
1974 const char* cp;
1975 // skip prefix path
1976 for (cp = file_name; *cp != '\0'; cp++) {
1977 if (*cp == '/' || *cp == file_sep) {
1978 p = cp + 1;
1979 }
1980 }
1982 int count_p = 0;
1983 int count_t = 0;
1984 while (*p != '\0') {
1985 if ((*p >= '0' && *p <= '9') ||
1986 (*p >= 'A' && *p <= 'Z') ||
1987 (*p >= 'a' && *p <= 'z') ||
1988 *p == '-' ||
1989 *p == '_' ||
1990 *p == '.') {
1991 p++;
1992 continue;
1993 }
1994 if (*p == '%') {
1995 if(*(p + 1) == 'p') {
1996 p += 2;
1997 count_p ++;
1998 continue;
1999 }
2000 if (*(p + 1) == 't') {
2001 p += 2;
2002 count_t ++;
2003 continue;
2004 }
2005 }
2006 return false;
2007 }
2008 return count_p < 2 && count_t < 2;
2009 }
2011 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2012 if (!is_percentage(min_heap_free_ratio)) {
2013 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2014 return false;
2015 }
2016 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2017 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2018 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2019 MaxHeapFreeRatio);
2020 return false;
2021 }
2022 // This does not set the flag itself, but stores the value in a safe place for later usage.
2023 _min_heap_free_ratio = min_heap_free_ratio;
2024 return true;
2025 }
2027 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2028 if (!is_percentage(max_heap_free_ratio)) {
2029 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2030 return false;
2031 }
2032 if (max_heap_free_ratio < MinHeapFreeRatio) {
2033 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2034 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2035 MinHeapFreeRatio);
2036 return false;
2037 }
2038 // This does not set the flag itself, but stores the value in a safe place for later usage.
2039 _max_heap_free_ratio = max_heap_free_ratio;
2040 return true;
2041 }
2043 // Check consistency of GC selection
2044 bool Arguments::check_gc_consistency_user() {
2045 check_gclog_consistency();
2046 bool status = true;
2047 // Ensure that the user has not selected conflicting sets
2048 // of collectors. [Note: this check is merely a user convenience;
2049 // collectors over-ride each other so that only a non-conflicting
2050 // set is selected; however what the user gets is not what they
2051 // may have expected from the combination they asked for. It's
2052 // better to reduce user confusion by not allowing them to
2053 // select conflicting combinations.
2054 uint i = 0;
2055 if (UseSerialGC) i++;
2056 if (UseConcMarkSweepGC || UseParNewGC) i++;
2057 if (UseParallelGC || UseParallelOldGC) i++;
2058 if (UseG1GC) i++;
2059 if (i > 1) {
2060 jio_fprintf(defaultStream::error_stream(),
2061 "Conflicting collector combinations in option list; "
2062 "please refer to the release notes for the combinations "
2063 "allowed\n");
2064 status = false;
2065 }
2066 return status;
2067 }
2069 void Arguments::check_deprecated_gcs() {
2070 if (UseConcMarkSweepGC && !UseParNewGC) {
2071 warning("Using the DefNew young collector with the CMS collector is deprecated "
2072 "and will likely be removed in a future release");
2073 }
2075 if (UseParNewGC && !UseConcMarkSweepGC) {
2076 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2077 // set up UseSerialGC properly, so that can't be used in the check here.
2078 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2079 "and will likely be removed in a future release");
2080 }
2082 if (CMSIncrementalMode) {
2083 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2084 }
2085 }
2087 void Arguments::check_deprecated_gc_flags() {
2088 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2089 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2090 "and will likely be removed in future release");
2091 }
2092 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2093 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2094 "Use MaxRAMFraction instead.");
2095 }
2096 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2097 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2098 }
2099 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2100 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2101 }
2102 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2103 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2104 }
2105 }
2107 // Check stack pages settings
2108 bool Arguments::check_stack_pages()
2109 {
2110 bool status = true;
2111 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2112 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2113 // greater stack shadow pages can't generate instruction to bang stack
2114 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2115 return status;
2116 }
2118 // Check the consistency of vm_init_args
2119 bool Arguments::check_vm_args_consistency() {
2120 // Method for adding checks for flag consistency.
2121 // The intent is to warn the user of all possible conflicts,
2122 // before returning an error.
2123 // Note: Needs platform-dependent factoring.
2124 bool status = true;
2126 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2127 // builds so the cost of stack banging can be measured.
2128 #if (defined(PRODUCT) && defined(SOLARIS))
2129 if (!UseBoundThreads && !UseStackBanging) {
2130 jio_fprintf(defaultStream::error_stream(),
2131 "-UseStackBanging conflicts with -UseBoundThreads\n");
2133 status = false;
2134 }
2135 #endif
2137 if (TLABRefillWasteFraction == 0) {
2138 jio_fprintf(defaultStream::error_stream(),
2139 "TLABRefillWasteFraction should be a denominator, "
2140 "not " SIZE_FORMAT "\n",
2141 TLABRefillWasteFraction);
2142 status = false;
2143 }
2145 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2146 "AdaptiveSizePolicyWeight");
2147 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2149 // Divide by bucket size to prevent a large size from causing rollover when
2150 // calculating amount of memory needed to be allocated for the String table.
2151 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2152 (max_uintx / StringTable::bucket_size()), "StringTable size");
2154 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2155 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2157 {
2158 // Using "else if" below to avoid printing two error messages if min > max.
2159 // This will also prevent us from reporting both min>100 and max>100 at the
2160 // same time, but that is less annoying than printing two identical errors IMHO.
2161 FormatBuffer<80> err_msg("%s","");
2162 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2163 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2164 status = false;
2165 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2166 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2167 status = false;
2168 }
2169 }
2171 // Min/MaxMetaspaceFreeRatio
2172 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2173 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2175 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2176 jio_fprintf(defaultStream::error_stream(),
2177 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2178 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2179 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2180 MinMetaspaceFreeRatio,
2181 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2182 MaxMetaspaceFreeRatio);
2183 status = false;
2184 }
2186 // Trying to keep 100% free is not practical
2187 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2189 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2190 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2191 }
2193 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2194 // Settings to encourage splitting.
2195 if (!FLAG_IS_CMDLINE(NewRatio)) {
2196 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2197 }
2198 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2199 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2200 }
2201 }
2203 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2204 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2205 if (GCTimeLimit == 100) {
2206 // Turn off gc-overhead-limit-exceeded checks
2207 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2208 }
2210 status = status && ArgumentsExt::check_gc_consistency_user();
2211 status = status && check_stack_pages();
2213 if (CMSIncrementalMode) {
2214 if (!UseConcMarkSweepGC) {
2215 jio_fprintf(defaultStream::error_stream(),
2216 "error: invalid argument combination.\n"
2217 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2218 "selected in order\nto use CMSIncrementalMode.\n");
2219 status = false;
2220 } else {
2221 status = status && verify_percentage(CMSIncrementalDutyCycle,
2222 "CMSIncrementalDutyCycle");
2223 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2224 "CMSIncrementalDutyCycleMin");
2225 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2226 "CMSIncrementalSafetyFactor");
2227 status = status && verify_percentage(CMSIncrementalOffset,
2228 "CMSIncrementalOffset");
2229 status = status && verify_percentage(CMSExpAvgFactor,
2230 "CMSExpAvgFactor");
2231 // If it was not set on the command line, set
2232 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2233 if (CMSInitiatingOccupancyFraction < 0) {
2234 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2235 }
2236 }
2237 }
2239 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2240 // insists that we hold the requisite locks so that the iteration is
2241 // MT-safe. For the verification at start-up and shut-down, we don't
2242 // yet have a good way of acquiring and releasing these locks,
2243 // which are not visible at the CollectedHeap level. We want to
2244 // be able to acquire these locks and then do the iteration rather
2245 // than just disable the lock verification. This will be fixed under
2246 // bug 4788986.
2247 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2248 if (VerifyDuringStartup) {
2249 warning("Heap verification at start-up disabled "
2250 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2251 VerifyDuringStartup = false; // Disable verification at start-up
2252 }
2254 if (VerifyBeforeExit) {
2255 warning("Heap verification at shutdown disabled "
2256 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2257 VerifyBeforeExit = false; // Disable verification at shutdown
2258 }
2259 }
2261 // Note: only executed in non-PRODUCT mode
2262 if (!UseAsyncConcMarkSweepGC &&
2263 (ExplicitGCInvokesConcurrent ||
2264 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2265 jio_fprintf(defaultStream::error_stream(),
2266 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2267 " with -UseAsyncConcMarkSweepGC");
2268 status = false;
2269 }
2271 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2273 #if INCLUDE_ALL_GCS
2274 if (UseG1GC) {
2275 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2276 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2277 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2279 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2280 "InitiatingHeapOccupancyPercent");
2281 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2282 "G1RefProcDrainInterval");
2283 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2284 "G1ConcMarkStepDurationMillis");
2285 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2286 "G1ConcRSHotCardLimit");
2287 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2288 "G1ConcRSLogCacheSize");
2289 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2290 "StringDeduplicationAgeThreshold");
2291 }
2292 if (UseConcMarkSweepGC) {
2293 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2294 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2295 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2296 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2298 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2300 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2301 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2302 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2304 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2306 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2307 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2309 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2310 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2311 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2313 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2315 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2317 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2318 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2319 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2320 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2321 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2322 }
2324 if (UseParallelGC || UseParallelOldGC) {
2325 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2326 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2328 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2329 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2331 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2332 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2334 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2336 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2337 }
2338 #endif // INCLUDE_ALL_GCS
2340 status = status && verify_interval(RefDiscoveryPolicy,
2341 ReferenceProcessor::DiscoveryPolicyMin,
2342 ReferenceProcessor::DiscoveryPolicyMax,
2343 "RefDiscoveryPolicy");
2345 // Limit the lower bound of this flag to 1 as it is used in a division
2346 // expression.
2347 status = status && verify_interval(TLABWasteTargetPercent,
2348 1, 100, "TLABWasteTargetPercent");
2350 status = status && verify_object_alignment();
2352 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2353 "CompressedClassSpaceSize");
2355 status = status && verify_interval(MarkStackSizeMax,
2356 1, (max_jint - 1), "MarkStackSizeMax");
2357 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2359 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2361 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2363 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2365 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2366 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2368 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2370 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2371 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2372 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2373 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2375 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2376 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2378 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2379 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2380 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2382 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2383 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2385 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2386 // just for that, so hardcode here.
2387 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2388 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2389 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2390 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2392 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2393 #ifdef COMPILER1
2394 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2395 #endif
2397 if (PrintNMTStatistics) {
2398 #if INCLUDE_NMT
2399 if (MemTracker::tracking_level() == NMT_off) {
2400 #endif // INCLUDE_NMT
2401 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2402 PrintNMTStatistics = false;
2403 #if INCLUDE_NMT
2404 }
2405 #endif
2406 }
2408 // Need to limit the extent of the padding to reasonable size.
2409 // 8K is well beyond the reasonable HW cache line size, even with the
2410 // aggressive prefetching, while still leaving the room for segregating
2411 // among the distinct pages.
2412 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2413 jio_fprintf(defaultStream::error_stream(),
2414 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2415 ContendedPaddingWidth, 0, 8192);
2416 status = false;
2417 }
2419 // Need to enforce the padding not to break the existing field alignments.
2420 // It is sufficient to check against the largest type size.
2421 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2422 jio_fprintf(defaultStream::error_stream(),
2423 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2424 ContendedPaddingWidth, BytesPerLong);
2425 status = false;
2426 }
2428 // Check lower bounds of the code cache
2429 // Template Interpreter code is approximately 3X larger in debug builds.
2430 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2431 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2432 jio_fprintf(defaultStream::error_stream(),
2433 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2434 os::vm_page_size()/K);
2435 status = false;
2436 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2439 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2440 status = false;
2441 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2442 jio_fprintf(defaultStream::error_stream(),
2443 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2444 min_code_cache_size/K);
2445 status = false;
2446 } else if (ReservedCodeCacheSize > 2*G) {
2447 // Code cache size larger than MAXINT is not supported.
2448 jio_fprintf(defaultStream::error_stream(),
2449 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2450 (2*G)/M);
2451 status = false;
2452 }
2454 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2455 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2457 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2458 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2459 }
2461 #ifdef COMPILER1
2462 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2463 #endif
2465 // TieredCompilation needs at least 2 compiler threads.
2466 const int num_min_compiler_threads = (TieredCompilation && (TieredStopAtLevel >= CompLevel_full_optimization)) ? 2 : CI_COMPILER_COUNT;
2467 status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount");
2469 return status;
2470 }
2472 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2473 const char* option_type) {
2474 if (ignore) return false;
2476 const char* spacer = " ";
2477 if (option_type == NULL) {
2478 option_type = ++spacer; // Set both to the empty string.
2479 }
2481 if (os::obsolete_option(option)) {
2482 jio_fprintf(defaultStream::error_stream(),
2483 "Obsolete %s%soption: %s\n", option_type, spacer,
2484 option->optionString);
2485 return false;
2486 } else {
2487 jio_fprintf(defaultStream::error_stream(),
2488 "Unrecognized %s%soption: %s\n", option_type, spacer,
2489 option->optionString);
2490 return true;
2491 }
2492 }
2494 static const char* user_assertion_options[] = {
2495 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2496 };
2498 static const char* system_assertion_options[] = {
2499 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2500 };
2502 // Return true if any of the strings in null-terminated array 'names' matches.
2503 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2504 // the option must match exactly.
2505 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2506 bool tail_allowed) {
2507 for (/* empty */; *names != NULL; ++names) {
2508 if (match_option(option, *names, tail)) {
2509 if (**tail == '\0' || tail_allowed && **tail == ':') {
2510 return true;
2511 }
2512 }
2513 }
2514 return false;
2515 }
2517 bool Arguments::parse_uintx(const char* value,
2518 uintx* uintx_arg,
2519 uintx min_size) {
2521 // Check the sign first since atomull() parses only unsigned values.
2522 bool value_is_positive = !(*value == '-');
2524 if (value_is_positive) {
2525 julong n;
2526 bool good_return = atomull(value, &n);
2527 if (good_return) {
2528 bool above_minimum = n >= min_size;
2529 bool value_is_too_large = n > max_uintx;
2531 if (above_minimum && !value_is_too_large) {
2532 *uintx_arg = n;
2533 return true;
2534 }
2535 }
2536 }
2537 return false;
2538 }
2540 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2541 julong* long_arg,
2542 julong min_size) {
2543 if (!atomull(s, long_arg)) return arg_unreadable;
2544 return check_memory_size(*long_arg, min_size);
2545 }
2547 // Parse JavaVMInitArgs structure
2549 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2550 // For components of the system classpath.
2551 SysClassPath scp(Arguments::get_sysclasspath());
2552 bool scp_assembly_required = false;
2554 // Save default settings for some mode flags
2555 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2556 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2557 Arguments::_ClipInlining = ClipInlining;
2558 Arguments::_BackgroundCompilation = BackgroundCompilation;
2560 // Setup flags for mixed which is the default
2561 set_mode_flags(_mixed);
2563 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2564 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2565 if (result != JNI_OK) {
2566 return result;
2567 }
2569 // Parse JavaVMInitArgs structure passed in
2570 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2571 if (result != JNI_OK) {
2572 return result;
2573 }
2575 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2576 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2577 if (result != JNI_OK) {
2578 return result;
2579 }
2581 // Do final processing now that all arguments have been parsed
2582 result = finalize_vm_init_args(&scp, scp_assembly_required);
2583 if (result != JNI_OK) {
2584 return result;
2585 }
2587 return JNI_OK;
2588 }
2590 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2591 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2592 // are dealing with -agentpath (case where name is a path), otherwise with
2593 // -agentlib
2594 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2595 char *_name;
2596 const char *_hprof = "hprof", *_jdwp = "jdwp";
2597 size_t _len_hprof, _len_jdwp, _len_prefix;
2599 if (is_path) {
2600 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2601 return false;
2602 }
2604 _name++; // skip past last path separator
2605 _len_prefix = strlen(JNI_LIB_PREFIX);
2607 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2608 return false;
2609 }
2611 _name += _len_prefix;
2612 _len_hprof = strlen(_hprof);
2613 _len_jdwp = strlen(_jdwp);
2615 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2616 _name += _len_hprof;
2617 }
2618 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2619 _name += _len_jdwp;
2620 }
2621 else {
2622 return false;
2623 }
2625 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2626 return false;
2627 }
2629 return true;
2630 }
2632 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2633 return true;
2634 }
2636 return false;
2637 }
2639 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2640 SysClassPath* scp_p,
2641 bool* scp_assembly_required_p,
2642 Flag::Flags origin) {
2643 // Remaining part of option string
2644 const char* tail;
2646 // iterate over arguments
2647 for (int index = 0; index < args->nOptions; index++) {
2648 bool is_absolute_path = false; // for -agentpath vs -agentlib
2650 const JavaVMOption* option = args->options + index;
2652 if (!match_option(option, "-Djava.class.path", &tail) &&
2653 !match_option(option, "-Dsun.java.command", &tail) &&
2654 !match_option(option, "-Dsun.java.launcher", &tail)) {
2656 // add all jvm options to the jvm_args string. This string
2657 // is used later to set the java.vm.args PerfData string constant.
2658 // the -Djava.class.path and the -Dsun.java.command options are
2659 // omitted from jvm_args string as each have their own PerfData
2660 // string constant object.
2661 build_jvm_args(option->optionString);
2662 }
2664 // -verbose:[class/gc/jni]
2665 if (match_option(option, "-verbose", &tail)) {
2666 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2667 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2668 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2669 } else if (!strcmp(tail, ":gc")) {
2670 FLAG_SET_CMDLINE(bool, PrintGC, true);
2671 } else if (!strcmp(tail, ":jni")) {
2672 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2673 }
2674 // -da / -ea / -disableassertions / -enableassertions
2675 // These accept an optional class/package name separated by a colon, e.g.,
2676 // -da:java.lang.Thread.
2677 } else if (match_option(option, user_assertion_options, &tail, true)) {
2678 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2679 if (*tail == '\0') {
2680 JavaAssertions::setUserClassDefault(enable);
2681 } else {
2682 assert(*tail == ':', "bogus match by match_option()");
2683 JavaAssertions::addOption(tail + 1, enable);
2684 }
2685 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2686 } else if (match_option(option, system_assertion_options, &tail, false)) {
2687 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2688 JavaAssertions::setSystemClassDefault(enable);
2689 // -bootclasspath:
2690 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2691 scp_p->reset_path(tail);
2692 *scp_assembly_required_p = true;
2693 // -bootclasspath/a:
2694 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2695 scp_p->add_suffix(tail);
2696 *scp_assembly_required_p = true;
2697 // -bootclasspath/p:
2698 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2699 scp_p->add_prefix(tail);
2700 *scp_assembly_required_p = true;
2701 // -Xrun
2702 } else if (match_option(option, "-Xrun", &tail)) {
2703 if (tail != NULL) {
2704 const char* pos = strchr(tail, ':');
2705 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2706 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2707 name[len] = '\0';
2709 char *options = NULL;
2710 if(pos != NULL) {
2711 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2712 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2713 }
2714 #if !INCLUDE_JVMTI
2715 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2716 jio_fprintf(defaultStream::error_stream(),
2717 "Profiling and debugging agents are not supported in this VM\n");
2718 return JNI_ERR;
2719 }
2720 #endif // !INCLUDE_JVMTI
2721 add_init_library(name, options);
2722 }
2723 // -agentlib and -agentpath
2724 } else if (match_option(option, "-agentlib:", &tail) ||
2725 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2726 if(tail != NULL) {
2727 const char* pos = strchr(tail, '=');
2728 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2729 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2730 name[len] = '\0';
2732 char *options = NULL;
2733 if(pos != NULL) {
2734 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2735 }
2736 #if !INCLUDE_JVMTI
2737 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2738 jio_fprintf(defaultStream::error_stream(),
2739 "Profiling and debugging agents are not supported in this VM\n");
2740 return JNI_ERR;
2741 }
2742 #endif // !INCLUDE_JVMTI
2743 add_init_agent(name, options, is_absolute_path);
2744 }
2745 // -javaagent
2746 } else if (match_option(option, "-javaagent:", &tail)) {
2747 #if !INCLUDE_JVMTI
2748 jio_fprintf(defaultStream::error_stream(),
2749 "Instrumentation agents are not supported in this VM\n");
2750 return JNI_ERR;
2751 #else
2752 if(tail != NULL) {
2753 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2754 add_init_agent("instrument", options, false);
2755 }
2756 #endif // !INCLUDE_JVMTI
2757 // -Xnoclassgc
2758 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2759 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2760 // -Xincgc: i-CMS
2761 } else if (match_option(option, "-Xincgc", &tail)) {
2762 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2763 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2764 // -Xnoincgc: no i-CMS
2765 } else if (match_option(option, "-Xnoincgc", &tail)) {
2766 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2767 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2768 // -Xconcgc
2769 } else if (match_option(option, "-Xconcgc", &tail)) {
2770 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2771 // -Xnoconcgc
2772 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2773 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2774 // -Xbatch
2775 } else if (match_option(option, "-Xbatch", &tail)) {
2776 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2777 // -Xmn for compatibility with other JVM vendors
2778 } else if (match_option(option, "-Xmn", &tail)) {
2779 julong long_initial_young_size = 0;
2780 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2781 if (errcode != arg_in_range) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Invalid initial young generation size: %s\n", option->optionString);
2784 describe_range_error(errcode);
2785 return JNI_EINVAL;
2786 }
2787 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2788 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2789 // -Xms
2790 } else if (match_option(option, "-Xms", &tail)) {
2791 julong long_initial_heap_size = 0;
2792 // an initial heap size of 0 means automatically determine
2793 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2794 if (errcode != arg_in_range) {
2795 jio_fprintf(defaultStream::error_stream(),
2796 "Invalid initial heap size: %s\n", option->optionString);
2797 describe_range_error(errcode);
2798 return JNI_EINVAL;
2799 }
2800 set_min_heap_size((uintx)long_initial_heap_size);
2801 // Currently the minimum size and the initial heap sizes are the same.
2802 // Can be overridden with -XX:InitialHeapSize.
2803 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2804 // -Xmx
2805 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2806 julong long_max_heap_size = 0;
2807 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2808 if (errcode != arg_in_range) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Invalid maximum heap size: %s\n", option->optionString);
2811 describe_range_error(errcode);
2812 return JNI_EINVAL;
2813 }
2814 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2815 // Xmaxf
2816 } else if (match_option(option, "-Xmaxf", &tail)) {
2817 char* err;
2818 int maxf = (int)(strtod(tail, &err) * 100);
2819 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "Bad max heap free percentage size: %s\n",
2822 option->optionString);
2823 return JNI_EINVAL;
2824 } else {
2825 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2826 }
2827 // Xminf
2828 } else if (match_option(option, "-Xminf", &tail)) {
2829 char* err;
2830 int minf = (int)(strtod(tail, &err) * 100);
2831 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2832 jio_fprintf(defaultStream::error_stream(),
2833 "Bad min heap free percentage size: %s\n",
2834 option->optionString);
2835 return JNI_EINVAL;
2836 } else {
2837 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2838 }
2839 // -Xss
2840 } else if (match_option(option, "-Xss", &tail)) {
2841 julong long_ThreadStackSize = 0;
2842 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2843 if (errcode != arg_in_range) {
2844 jio_fprintf(defaultStream::error_stream(),
2845 "Invalid thread stack size: %s\n", option->optionString);
2846 describe_range_error(errcode);
2847 return JNI_EINVAL;
2848 }
2849 // Internally track ThreadStackSize in units of 1024 bytes.
2850 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2851 round_to((int)long_ThreadStackSize, K) / K);
2852 // -Xoss
2853 } else if (match_option(option, "-Xoss", &tail)) {
2854 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2855 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2856 julong long_CodeCacheExpansionSize = 0;
2857 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2858 if (errcode != arg_in_range) {
2859 jio_fprintf(defaultStream::error_stream(),
2860 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2861 os::vm_page_size()/K);
2862 return JNI_EINVAL;
2863 }
2864 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2865 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2866 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2867 julong long_ReservedCodeCacheSize = 0;
2869 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2870 if (errcode != arg_in_range) {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "Invalid maximum code cache size: %s.\n", option->optionString);
2873 return JNI_EINVAL;
2874 }
2875 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2876 //-XX:IncreaseFirstTierCompileThresholdAt=
2877 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2878 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2879 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2882 option->optionString);
2883 return JNI_EINVAL;
2884 }
2885 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2886 // -green
2887 } else if (match_option(option, "-green", &tail)) {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Green threads support not available\n");
2890 return JNI_EINVAL;
2891 // -native
2892 } else if (match_option(option, "-native", &tail)) {
2893 // HotSpot always uses native threads, ignore silently for compatibility
2894 // -Xsqnopause
2895 } else if (match_option(option, "-Xsqnopause", &tail)) {
2896 // EVM option, ignore silently for compatibility
2897 // -Xrs
2898 } else if (match_option(option, "-Xrs", &tail)) {
2899 // Classic/EVM option, new functionality
2900 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2901 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2902 // change default internal VM signals used - lower case for back compat
2903 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2904 // -Xoptimize
2905 } else if (match_option(option, "-Xoptimize", &tail)) {
2906 // EVM option, ignore silently for compatibility
2907 // -Xprof
2908 } else if (match_option(option, "-Xprof", &tail)) {
2909 #if INCLUDE_FPROF
2910 _has_profile = true;
2911 #else // INCLUDE_FPROF
2912 jio_fprintf(defaultStream::error_stream(),
2913 "Flat profiling is not supported in this VM.\n");
2914 return JNI_ERR;
2915 #endif // INCLUDE_FPROF
2916 // -Xconcurrentio
2917 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2918 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2919 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2920 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2921 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2922 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2924 // -Xinternalversion
2925 } else if (match_option(option, "-Xinternalversion", &tail)) {
2926 jio_fprintf(defaultStream::output_stream(), "%s\n",
2927 VM_Version::internal_vm_info_string());
2928 vm_exit(0);
2929 #ifndef PRODUCT
2930 // -Xprintflags
2931 } else if (match_option(option, "-Xprintflags", &tail)) {
2932 CommandLineFlags::printFlags(tty, false);
2933 vm_exit(0);
2934 #endif
2935 // -D
2936 } else if (match_option(option, "-D", &tail)) {
2937 if (!add_property(tail)) {
2938 return JNI_ENOMEM;
2939 }
2940 // Out of the box management support
2941 if (match_option(option, "-Dcom.sun.management", &tail)) {
2942 #if INCLUDE_MANAGEMENT
2943 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2944 #else
2945 jio_fprintf(defaultStream::output_stream(),
2946 "-Dcom.sun.management is not supported in this VM.\n");
2947 return JNI_ERR;
2948 #endif
2949 }
2950 // -Xint
2951 } else if (match_option(option, "-Xint", &tail)) {
2952 set_mode_flags(_int);
2953 // -Xmixed
2954 } else if (match_option(option, "-Xmixed", &tail)) {
2955 set_mode_flags(_mixed);
2956 // -Xcomp
2957 } else if (match_option(option, "-Xcomp", &tail)) {
2958 // for testing the compiler; turn off all flags that inhibit compilation
2959 set_mode_flags(_comp);
2960 // -Xshare:dump
2961 } else if (match_option(option, "-Xshare:dump", &tail)) {
2962 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2963 set_mode_flags(_int); // Prevent compilation, which creates objects
2964 // -Xshare:on
2965 } else if (match_option(option, "-Xshare:on", &tail)) {
2966 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2967 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2968 // -Xshare:auto
2969 } else if (match_option(option, "-Xshare:auto", &tail)) {
2970 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2971 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2972 // -Xshare:off
2973 } else if (match_option(option, "-Xshare:off", &tail)) {
2974 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2975 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2976 // -Xverify
2977 } else if (match_option(option, "-Xverify", &tail)) {
2978 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2979 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2980 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2981 } else if (strcmp(tail, ":remote") == 0) {
2982 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2983 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2984 } else if (strcmp(tail, ":none") == 0) {
2985 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2986 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2987 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2988 return JNI_EINVAL;
2989 }
2990 // -Xdebug
2991 } else if (match_option(option, "-Xdebug", &tail)) {
2992 // note this flag has been used, then ignore
2993 set_xdebug_mode(true);
2994 // -Xnoagent
2995 } else if (match_option(option, "-Xnoagent", &tail)) {
2996 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2997 } else if (match_option(option, "-Xboundthreads", &tail)) {
2998 // Bind user level threads to kernel threads (Solaris only)
2999 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3000 } else if (match_option(option, "-Xloggc:", &tail)) {
3001 // Redirect GC output to the file. -Xloggc:<filename>
3002 // ostream_init_log(), when called will use this filename
3003 // to initialize a fileStream.
3004 _gc_log_filename = strdup(tail);
3005 if (!is_filename_valid(_gc_log_filename)) {
3006 jio_fprintf(defaultStream::output_stream(),
3007 "Invalid file name for use with -Xloggc: Filename can only contain the "
3008 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3009 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3010 return JNI_EINVAL;
3011 }
3012 FLAG_SET_CMDLINE(bool, PrintGC, true);
3013 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3015 // JNI hooks
3016 } else if (match_option(option, "-Xcheck", &tail)) {
3017 if (!strcmp(tail, ":jni")) {
3018 #if !INCLUDE_JNI_CHECK
3019 warning("JNI CHECKING is not supported in this VM");
3020 #else
3021 CheckJNICalls = true;
3022 #endif // INCLUDE_JNI_CHECK
3023 } else if (is_bad_option(option, args->ignoreUnrecognized,
3024 "check")) {
3025 return JNI_EINVAL;
3026 }
3027 } else if (match_option(option, "vfprintf", &tail)) {
3028 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3029 } else if (match_option(option, "exit", &tail)) {
3030 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3031 } else if (match_option(option, "abort", &tail)) {
3032 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3033 // -XX:+AggressiveHeap
3034 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3036 // This option inspects the machine and attempts to set various
3037 // parameters to be optimal for long-running, memory allocation
3038 // intensive jobs. It is intended for machines with large
3039 // amounts of cpu and memory.
3041 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3042 // VM, but we may not be able to represent the total physical memory
3043 // available (like having 8gb of memory on a box but using a 32bit VM).
3044 // Thus, we need to make sure we're using a julong for intermediate
3045 // calculations.
3046 julong initHeapSize;
3047 julong total_memory = os::physical_memory();
3049 if (total_memory < (julong)256*M) {
3050 jio_fprintf(defaultStream::error_stream(),
3051 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3052 vm_exit(1);
3053 }
3055 // The heap size is half of available memory, or (at most)
3056 // all of possible memory less 160mb (leaving room for the OS
3057 // when using ISM). This is the maximum; because adaptive sizing
3058 // is turned on below, the actual space used may be smaller.
3060 initHeapSize = MIN2(total_memory / (julong)2,
3061 total_memory - (julong)160*M);
3063 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3065 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3066 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3067 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3068 // Currently the minimum size and the initial heap sizes are the same.
3069 set_min_heap_size(initHeapSize);
3070 }
3071 if (FLAG_IS_DEFAULT(NewSize)) {
3072 // Make the young generation 3/8ths of the total heap.
3073 FLAG_SET_CMDLINE(uintx, NewSize,
3074 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3075 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3076 }
3078 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3079 FLAG_SET_DEFAULT(UseLargePages, true);
3080 #endif
3082 // Increase some data structure sizes for efficiency
3083 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3084 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3085 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3087 // See the OldPLABSize comment below, but replace 'after promotion'
3088 // with 'after copying'. YoungPLABSize is the size of the survivor
3089 // space per-gc-thread buffers. The default is 4kw.
3090 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3092 // OldPLABSize is the size of the buffers in the old gen that
3093 // UseParallelGC uses to promote live data that doesn't fit in the
3094 // survivor spaces. At any given time, there's one for each gc thread.
3095 // The default size is 1kw. These buffers are rarely used, since the
3096 // survivor spaces are usually big enough. For specjbb, however, there
3097 // are occasions when there's lots of live data in the young gen
3098 // and we end up promoting some of it. We don't have a definite
3099 // explanation for why bumping OldPLABSize helps, but the theory
3100 // is that a bigger PLAB results in retaining something like the
3101 // original allocation order after promotion, which improves mutator
3102 // locality. A minor effect may be that larger PLABs reduce the
3103 // number of PLAB allocation events during gc. The value of 8kw
3104 // was arrived at by experimenting with specjbb.
3105 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3107 // Enable parallel GC and adaptive generation sizing
3108 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3109 FLAG_SET_DEFAULT(ParallelGCThreads,
3110 Abstract_VM_Version::parallel_worker_threads());
3112 // Encourage steady state memory management
3113 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3115 // This appears to improve mutator locality
3116 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3118 // Get around early Solaris scheduling bug
3119 // (affinity vs other jobs on system)
3120 // but disallow DR and offlining (5008695).
3121 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3123 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3124 // The last option must always win.
3125 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3126 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3127 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3128 // The last option must always win.
3129 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3130 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3131 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3132 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3133 jio_fprintf(defaultStream::error_stream(),
3134 "Please use CMSClassUnloadingEnabled in place of "
3135 "CMSPermGenSweepingEnabled in the future\n");
3136 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3137 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3138 jio_fprintf(defaultStream::error_stream(),
3139 "Please use -XX:+UseGCOverheadLimit in place of "
3140 "-XX:+UseGCTimeLimit in the future\n");
3141 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3142 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3143 jio_fprintf(defaultStream::error_stream(),
3144 "Please use -XX:-UseGCOverheadLimit in place of "
3145 "-XX:-UseGCTimeLimit in the future\n");
3146 // The TLE options are for compatibility with 1.3 and will be
3147 // removed without notice in a future release. These options
3148 // are not to be documented.
3149 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3150 // No longer used.
3151 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3152 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3153 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3154 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3155 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3156 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3157 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3158 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3159 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3160 // No longer used.
3161 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3162 julong long_tlab_size = 0;
3163 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3164 if (errcode != arg_in_range) {
3165 jio_fprintf(defaultStream::error_stream(),
3166 "Invalid TLAB size: %s\n", option->optionString);
3167 describe_range_error(errcode);
3168 return JNI_EINVAL;
3169 }
3170 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3171 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3172 // No longer used.
3173 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3174 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3175 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3176 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3177 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3178 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3179 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3180 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3181 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3182 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3183 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3184 #if defined(DTRACE_ENABLED)
3185 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3186 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3187 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3188 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3189 #else // defined(DTRACE_ENABLED)
3190 jio_fprintf(defaultStream::error_stream(),
3191 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3192 return JNI_EINVAL;
3193 #endif // defined(DTRACE_ENABLED)
3194 #ifdef ASSERT
3195 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3196 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3197 // disable scavenge before parallel mark-compact
3198 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3199 #endif
3200 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3201 julong cms_blocks_to_claim = (julong)atol(tail);
3202 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3203 jio_fprintf(defaultStream::error_stream(),
3204 "Please use -XX:OldPLABSize in place of "
3205 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3206 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3207 julong cms_blocks_to_claim = (julong)atol(tail);
3208 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3209 jio_fprintf(defaultStream::error_stream(),
3210 "Please use -XX:OldPLABSize in place of "
3211 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3212 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3213 julong old_plab_size = 0;
3214 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3215 if (errcode != arg_in_range) {
3216 jio_fprintf(defaultStream::error_stream(),
3217 "Invalid old PLAB size: %s\n", option->optionString);
3218 describe_range_error(errcode);
3219 return JNI_EINVAL;
3220 }
3221 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Please use -XX:OldPLABSize in place of "
3224 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3225 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3226 julong young_plab_size = 0;
3227 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3228 if (errcode != arg_in_range) {
3229 jio_fprintf(defaultStream::error_stream(),
3230 "Invalid young PLAB size: %s\n", option->optionString);
3231 describe_range_error(errcode);
3232 return JNI_EINVAL;
3233 }
3234 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3235 jio_fprintf(defaultStream::error_stream(),
3236 "Please use -XX:YoungPLABSize in place of "
3237 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3238 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3239 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3240 julong stack_size = 0;
3241 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3242 if (errcode != arg_in_range) {
3243 jio_fprintf(defaultStream::error_stream(),
3244 "Invalid mark stack size: %s\n", option->optionString);
3245 describe_range_error(errcode);
3246 return JNI_EINVAL;
3247 }
3248 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3249 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3250 julong max_stack_size = 0;
3251 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3252 if (errcode != arg_in_range) {
3253 jio_fprintf(defaultStream::error_stream(),
3254 "Invalid maximum mark stack size: %s\n",
3255 option->optionString);
3256 describe_range_error(errcode);
3257 return JNI_EINVAL;
3258 }
3259 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3260 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3261 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3262 uintx conc_threads = 0;
3263 if (!parse_uintx(tail, &conc_threads, 1)) {
3264 jio_fprintf(defaultStream::error_stream(),
3265 "Invalid concurrent threads: %s\n", option->optionString);
3266 return JNI_EINVAL;
3267 }
3268 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3269 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3270 julong max_direct_memory_size = 0;
3271 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3272 if (errcode != arg_in_range) {
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Invalid maximum direct memory size: %s\n",
3275 option->optionString);
3276 describe_range_error(errcode);
3277 return JNI_EINVAL;
3278 }
3279 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3280 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3281 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3282 // away and will cause VM initialization failures!
3283 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3284 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3285 #if !INCLUDE_MANAGEMENT
3286 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3287 jio_fprintf(defaultStream::error_stream(),
3288 "ManagementServer is not supported in this VM.\n");
3289 return JNI_ERR;
3290 #endif // INCLUDE_MANAGEMENT
3291 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3292 // Skip -XX:Flags= since that case has already been handled
3293 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3294 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3295 return JNI_EINVAL;
3296 }
3297 }
3298 // Unknown option
3299 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3300 return JNI_ERR;
3301 }
3302 }
3304 // PrintSharedArchiveAndExit will turn on
3305 // -Xshare:on
3306 // -XX:+TraceClassPaths
3307 if (PrintSharedArchiveAndExit) {
3308 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3309 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3310 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3311 }
3313 // Change the default value for flags which have different default values
3314 // when working with older JDKs.
3315 #ifdef LINUX
3316 if (JDK_Version::current().compare_major(6) <= 0 &&
3317 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3318 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3319 }
3320 #endif // LINUX
3321 fix_appclasspath();
3322 return JNI_OK;
3323 }
3325 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3326 //
3327 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3328 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3329 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3330 // path is treated as the current directory.
3331 //
3332 // This causes problems with CDS, which requires that all directories specified in the classpath
3333 // must be empty. In most cases, applications do NOT want to load classes from the current
3334 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3335 // scripts compatible with CDS.
3336 void Arguments::fix_appclasspath() {
3337 if (IgnoreEmptyClassPaths) {
3338 const char separator = *os::path_separator();
3339 const char* src = _java_class_path->value();
3341 // skip over all the leading empty paths
3342 while (*src == separator) {
3343 src ++;
3344 }
3346 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3347 strncpy(copy, src, strlen(src) + 1);
3349 // trim all trailing empty paths
3350 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3351 *tail = '\0';
3352 }
3354 char from[3] = {separator, separator, '\0'};
3355 char to [2] = {separator, '\0'};
3356 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3357 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3358 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3359 }
3361 _java_class_path->set_value(copy);
3362 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3363 }
3365 if (!PrintSharedArchiveAndExit) {
3366 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3367 }
3368 }
3370 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3371 // This must be done after all -D arguments have been processed.
3372 scp_p->expand_endorsed();
3374 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3375 // Assemble the bootclasspath elements into the final path.
3376 Arguments::set_sysclasspath(scp_p->combined_path());
3377 }
3379 // This must be done after all arguments have been processed.
3380 // java_compiler() true means set to "NONE" or empty.
3381 if (java_compiler() && !xdebug_mode()) {
3382 // For backwards compatibility, we switch to interpreted mode if
3383 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3384 // not specified.
3385 set_mode_flags(_int);
3386 }
3387 if (CompileThreshold == 0) {
3388 set_mode_flags(_int);
3389 }
3391 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3392 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3393 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3394 }
3396 #ifndef COMPILER2
3397 // Don't degrade server performance for footprint
3398 if (FLAG_IS_DEFAULT(UseLargePages) &&
3399 MaxHeapSize < LargePageHeapSizeThreshold) {
3400 // No need for large granularity pages w/small heaps.
3401 // Note that large pages are enabled/disabled for both the
3402 // Java heap and the code cache.
3403 FLAG_SET_DEFAULT(UseLargePages, false);
3404 }
3406 #else
3407 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3408 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3409 }
3410 #endif
3412 #ifndef TIERED
3413 // Tiered compilation is undefined.
3414 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3415 #endif
3417 // If we are running in a headless jre, force java.awt.headless property
3418 // to be true unless the property has already been set.
3419 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3420 if (os::is_headless_jre()) {
3421 const char* headless = Arguments::get_property("java.awt.headless");
3422 if (headless == NULL) {
3423 char envbuffer[128];
3424 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3425 if (!add_property("java.awt.headless=true")) {
3426 return JNI_ENOMEM;
3427 }
3428 } else {
3429 char buffer[256];
3430 strcpy(buffer, "java.awt.headless=");
3431 strcat(buffer, envbuffer);
3432 if (!add_property(buffer)) {
3433 return JNI_ENOMEM;
3434 }
3435 }
3436 }
3437 }
3439 if (!ArgumentsExt::check_vm_args_consistency()) {
3440 return JNI_ERR;
3441 }
3443 return JNI_OK;
3444 }
3446 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3447 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3448 scp_assembly_required_p);
3449 }
3451 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3452 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3453 scp_assembly_required_p);
3454 }
3456 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3457 const int N_MAX_OPTIONS = 64;
3458 const int OPTION_BUFFER_SIZE = 1024;
3459 char buffer[OPTION_BUFFER_SIZE];
3461 // The variable will be ignored if it exceeds the length of the buffer.
3462 // Don't check this variable if user has special privileges
3463 // (e.g. unix su command).
3464 if (os::getenv(name, buffer, sizeof(buffer)) &&
3465 !os::have_special_privileges()) {
3466 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3467 jio_fprintf(defaultStream::error_stream(),
3468 "Picked up %s: %s\n", name, buffer);
3469 char* rd = buffer; // pointer to the input string (rd)
3470 int i;
3471 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3472 while (isspace(*rd)) rd++; // skip whitespace
3473 if (*rd == 0) break; // we re done when the input string is read completely
3475 // The output, option string, overwrites the input string.
3476 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3477 // input string (rd).
3478 char* wrt = rd;
3480 options[i++].optionString = wrt; // Fill in option
3481 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3482 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3483 int quote = *rd; // matching quote to look for
3484 rd++; // don't copy open quote
3485 while (*rd != quote) { // include everything (even spaces) up until quote
3486 if (*rd == 0) { // string termination means unmatched string
3487 jio_fprintf(defaultStream::error_stream(),
3488 "Unmatched quote in %s\n", name);
3489 return JNI_ERR;
3490 }
3491 *wrt++ = *rd++; // copy to option string
3492 }
3493 rd++; // don't copy close quote
3494 } else {
3495 *wrt++ = *rd++; // copy to option string
3496 }
3497 }
3498 // Need to check if we're done before writing a NULL,
3499 // because the write could be to the byte that rd is pointing to.
3500 if (*rd++ == 0) {
3501 *wrt = 0;
3502 break;
3503 }
3504 *wrt = 0; // Zero terminate option
3505 }
3506 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3507 JavaVMInitArgs vm_args;
3508 vm_args.version = JNI_VERSION_1_2;
3509 vm_args.options = options;
3510 vm_args.nOptions = i;
3511 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3513 if (PrintVMOptions) {
3514 const char* tail;
3515 for (int i = 0; i < vm_args.nOptions; i++) {
3516 const JavaVMOption *option = vm_args.options + i;
3517 if (match_option(option, "-XX:", &tail)) {
3518 logOption(tail);
3519 }
3520 }
3521 }
3523 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3524 }
3525 return JNI_OK;
3526 }
3528 void Arguments::set_shared_spaces_flags() {
3529 if (DumpSharedSpaces) {
3530 if (RequireSharedSpaces) {
3531 warning("cannot dump shared archive while using shared archive");
3532 }
3533 UseSharedSpaces = false;
3534 #ifdef _LP64
3535 if (!UseCompressedOops || !UseCompressedClassPointers) {
3536 vm_exit_during_initialization(
3537 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3538 }
3539 } else {
3540 if (!UseCompressedOops || !UseCompressedClassPointers) {
3541 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3542 }
3543 #endif
3544 }
3545 }
3547 #if !INCLUDE_ALL_GCS
3548 static void force_serial_gc() {
3549 FLAG_SET_DEFAULT(UseSerialGC, true);
3550 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3551 UNSUPPORTED_GC_OPTION(UseG1GC);
3552 UNSUPPORTED_GC_OPTION(UseParallelGC);
3553 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3554 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3555 UNSUPPORTED_GC_OPTION(UseParNewGC);
3556 }
3557 #endif // INCLUDE_ALL_GCS
3559 // Sharing support
3560 // Construct the path to the archive
3561 static char* get_shared_archive_path() {
3562 char *shared_archive_path;
3563 if (SharedArchiveFile == NULL) {
3564 char jvm_path[JVM_MAXPATHLEN];
3565 os::jvm_path(jvm_path, sizeof(jvm_path));
3566 char *end = strrchr(jvm_path, *os::file_separator());
3567 if (end != NULL) *end = '\0';
3568 size_t jvm_path_len = strlen(jvm_path);
3569 size_t file_sep_len = strlen(os::file_separator());
3570 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3571 file_sep_len + 20, mtInternal);
3572 if (shared_archive_path != NULL) {
3573 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3574 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3575 strncat(shared_archive_path, "classes.jsa", 11);
3576 }
3577 } else {
3578 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3579 if (shared_archive_path != NULL) {
3580 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3581 }
3582 }
3583 return shared_archive_path;
3584 }
3586 #ifndef PRODUCT
3587 // Determine whether LogVMOutput should be implicitly turned on.
3588 static bool use_vm_log() {
3589 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3590 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3591 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3592 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3593 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3594 return true;
3595 }
3597 #ifdef COMPILER1
3598 if (PrintC1Statistics) {
3599 return true;
3600 }
3601 #endif // COMPILER1
3603 #ifdef COMPILER2
3604 if (PrintOptoAssembly || PrintOptoStatistics) {
3605 return true;
3606 }
3607 #endif // COMPILER2
3609 return false;
3610 }
3611 #endif // PRODUCT
3613 // Parse entry point called from JNI_CreateJavaVM
3615 jint Arguments::parse(const JavaVMInitArgs* args) {
3617 // Remaining part of option string
3618 const char* tail;
3620 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3621 const char* hotspotrc = ".hotspotrc";
3622 bool settings_file_specified = false;
3623 bool needs_hotspotrc_warning = false;
3625 ArgumentsExt::process_options(args);
3627 const char* flags_file;
3628 int index;
3629 for (index = 0; index < args->nOptions; index++) {
3630 const JavaVMOption *option = args->options + index;
3631 if (match_option(option, "-XX:Flags=", &tail)) {
3632 flags_file = tail;
3633 settings_file_specified = true;
3634 }
3635 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3636 PrintVMOptions = true;
3637 }
3638 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3639 PrintVMOptions = false;
3640 }
3641 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3642 IgnoreUnrecognizedVMOptions = true;
3643 }
3644 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3645 IgnoreUnrecognizedVMOptions = false;
3646 }
3647 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3648 CommandLineFlags::printFlags(tty, false);
3649 vm_exit(0);
3650 }
3651 #if INCLUDE_NMT
3652 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3653 // The launcher did not setup nmt environment variable properly.
3654 if (!MemTracker::check_launcher_nmt_support(tail)) {
3655 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3656 }
3658 // Verify if nmt option is valid.
3659 if (MemTracker::verify_nmt_option()) {
3660 // Late initialization, still in single-threaded mode.
3661 if (MemTracker::tracking_level() >= NMT_summary) {
3662 MemTracker::init();
3663 }
3664 } else {
3665 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3666 }
3667 }
3668 #endif
3671 #ifndef PRODUCT
3672 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3673 CommandLineFlags::printFlags(tty, true);
3674 vm_exit(0);
3675 }
3676 #endif
3677 }
3679 if (IgnoreUnrecognizedVMOptions) {
3680 // uncast const to modify the flag args->ignoreUnrecognized
3681 *(jboolean*)(&args->ignoreUnrecognized) = true;
3682 }
3684 // Parse specified settings file
3685 if (settings_file_specified) {
3686 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3687 return JNI_EINVAL;
3688 }
3689 } else {
3690 #ifdef ASSERT
3691 // Parse default .hotspotrc settings file
3692 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3693 return JNI_EINVAL;
3694 }
3695 #else
3696 struct stat buf;
3697 if (os::stat(hotspotrc, &buf) == 0) {
3698 needs_hotspotrc_warning = true;
3699 }
3700 #endif
3701 }
3703 if (PrintVMOptions) {
3704 for (index = 0; index < args->nOptions; index++) {
3705 const JavaVMOption *option = args->options + index;
3706 if (match_option(option, "-XX:", &tail)) {
3707 logOption(tail);
3708 }
3709 }
3710 }
3712 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3713 jint result = parse_vm_init_args(args);
3714 if (result != JNI_OK) {
3715 return result;
3716 }
3718 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3719 SharedArchivePath = get_shared_archive_path();
3720 if (SharedArchivePath == NULL) {
3721 return JNI_ENOMEM;
3722 }
3724 // Set up VerifySharedSpaces
3725 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3726 VerifySharedSpaces = true;
3727 }
3729 // Delay warning until here so that we've had a chance to process
3730 // the -XX:-PrintWarnings flag
3731 if (needs_hotspotrc_warning) {
3732 warning("%s file is present but has been ignored. "
3733 "Run with -XX:Flags=%s to load the file.",
3734 hotspotrc, hotspotrc);
3735 }
3737 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3738 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3739 #endif
3741 #if INCLUDE_ALL_GCS
3742 #if (defined JAVASE_EMBEDDED || defined ARM)
3743 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3744 #endif
3745 #endif
3747 #ifndef PRODUCT
3748 if (TraceBytecodesAt != 0) {
3749 TraceBytecodes = true;
3750 }
3751 if (CountCompiledCalls) {
3752 if (UseCounterDecay) {
3753 warning("UseCounterDecay disabled because CountCalls is set");
3754 UseCounterDecay = false;
3755 }
3756 }
3757 #endif // PRODUCT
3759 // JSR 292 is not supported before 1.7
3760 if (!JDK_Version::is_gte_jdk17x_version()) {
3761 if (EnableInvokeDynamic) {
3762 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3763 warning("JSR 292 is not supported before 1.7. Disabling support.");
3764 }
3765 EnableInvokeDynamic = false;
3766 }
3767 }
3769 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3770 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3771 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3772 }
3773 ScavengeRootsInCode = 1;
3774 }
3776 if (PrintGCDetails) {
3777 // Turn on -verbose:gc options as well
3778 PrintGC = true;
3779 }
3781 if (!JDK_Version::is_gte_jdk18x_version()) {
3782 // To avoid changing the log format for 7 updates this flag is only
3783 // true by default in JDK8 and above.
3784 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3785 FLAG_SET_DEFAULT(PrintGCCause, false);
3786 }
3787 }
3789 // Set object alignment values.
3790 set_object_alignment();
3792 #if !INCLUDE_ALL_GCS
3793 force_serial_gc();
3794 #endif // INCLUDE_ALL_GCS
3795 #if !INCLUDE_CDS
3796 if (DumpSharedSpaces || RequireSharedSpaces) {
3797 jio_fprintf(defaultStream::error_stream(),
3798 "Shared spaces are not supported in this VM\n");
3799 return JNI_ERR;
3800 }
3801 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3802 warning("Shared spaces are not supported in this VM");
3803 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3804 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3805 }
3806 no_shared_spaces("CDS Disabled");
3807 #endif // INCLUDE_CDS
3809 return JNI_OK;
3810 }
3812 jint Arguments::apply_ergo() {
3814 // Set flags based on ergonomics.
3815 set_ergonomics_flags();
3817 set_shared_spaces_flags();
3819 // Check the GC selections again.
3820 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3821 return JNI_EINVAL;
3822 }
3824 if (TieredCompilation) {
3825 set_tiered_flags();
3826 } else {
3827 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3828 if (CompilationPolicyChoice >= 2) {
3829 vm_exit_during_initialization(
3830 "Incompatible compilation policy selected", NULL);
3831 }
3832 }
3833 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3834 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3835 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3836 }
3839 // Set heap size based on available physical memory
3840 set_heap_size();
3842 set_gc_specific_flags();
3844 // Initialize Metaspace flags and alignments.
3845 Metaspace::ergo_initialize();
3847 // Set bytecode rewriting flags
3848 set_bytecode_flags();
3850 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3851 set_aggressive_opts_flags();
3853 // Turn off biased locking for locking debug mode flags,
3854 // which are subtlely different from each other but neither works with
3855 // biased locking.
3856 if (UseHeavyMonitors
3857 #ifdef COMPILER1
3858 || !UseFastLocking
3859 #endif // COMPILER1
3860 ) {
3861 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3862 // flag set to true on command line; warn the user that they
3863 // can't enable biased locking here
3864 warning("Biased Locking is not supported with locking debug flags"
3865 "; ignoring UseBiasedLocking flag." );
3866 }
3867 UseBiasedLocking = false;
3868 }
3870 #ifdef ZERO
3871 // Clear flags not supported on zero.
3872 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3873 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3874 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3875 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3876 #endif // CC_INTERP
3878 #ifdef COMPILER2
3879 if (!EliminateLocks) {
3880 EliminateNestedLocks = false;
3881 }
3882 if (!Inline) {
3883 IncrementalInline = false;
3884 }
3885 #ifndef PRODUCT
3886 if (!IncrementalInline) {
3887 AlwaysIncrementalInline = false;
3888 }
3889 #endif
3890 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3891 // incremental inlining: bump MaxNodeLimit
3892 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3893 }
3894 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3895 // nothing to use the profiling, turn if off
3896 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3897 }
3898 #endif
3900 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3901 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3902 DebugNonSafepoints = true;
3903 }
3905 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3906 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3907 }
3909 #ifndef PRODUCT
3910 if (CompileTheWorld) {
3911 // Force NmethodSweeper to sweep whole CodeCache each time.
3912 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3913 NmethodSweepFraction = 1;
3914 }
3915 }
3917 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3918 if (use_vm_log()) {
3919 LogVMOutput = true;
3920 }
3921 }
3922 #endif // PRODUCT
3924 if (PrintCommandLineFlags) {
3925 CommandLineFlags::printSetFlags(tty);
3926 }
3928 // Apply CPU specific policy for the BiasedLocking
3929 if (UseBiasedLocking) {
3930 if (!VM_Version::use_biased_locking() &&
3931 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3932 UseBiasedLocking = false;
3933 }
3934 }
3935 #ifdef COMPILER2
3936 if (!UseBiasedLocking || EmitSync != 0) {
3937 UseOptoBiasInlining = false;
3938 }
3939 #endif
3941 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3942 // but only if not already set on the commandline
3943 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3944 bool set = false;
3945 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3946 if (!set) {
3947 FLAG_SET_DEFAULT(PauseAtExit, true);
3948 }
3949 }
3951 return JNI_OK;
3952 }
3954 jint Arguments::adjust_after_os() {
3955 if (UseNUMA) {
3956 if (UseParallelGC || UseParallelOldGC) {
3957 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3958 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3959 }
3960 }
3961 // UseNUMAInterleaving is set to ON for all collectors and
3962 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3963 // such as the parallel collector for Linux and Solaris will
3964 // interleave old gen and survivor spaces on top of NUMA
3965 // allocation policy for the eden space.
3966 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3967 // all platforms and ParallelGC on Windows will interleave all
3968 // of the heap spaces across NUMA nodes.
3969 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3970 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3971 }
3972 }
3973 return JNI_OK;
3974 }
3976 int Arguments::PropertyList_count(SystemProperty* pl) {
3977 int count = 0;
3978 while(pl != NULL) {
3979 count++;
3980 pl = pl->next();
3981 }
3982 return count;
3983 }
3985 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3986 assert(key != NULL, "just checking");
3987 SystemProperty* prop;
3988 for (prop = pl; prop != NULL; prop = prop->next()) {
3989 if (strcmp(key, prop->key()) == 0) return prop->value();
3990 }
3991 return NULL;
3992 }
3994 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3995 int count = 0;
3996 const char* ret_val = NULL;
3998 while(pl != NULL) {
3999 if(count >= index) {
4000 ret_val = pl->key();
4001 break;
4002 }
4003 count++;
4004 pl = pl->next();
4005 }
4007 return ret_val;
4008 }
4010 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4011 int count = 0;
4012 char* ret_val = NULL;
4014 while(pl != NULL) {
4015 if(count >= index) {
4016 ret_val = pl->value();
4017 break;
4018 }
4019 count++;
4020 pl = pl->next();
4021 }
4023 return ret_val;
4024 }
4026 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4027 SystemProperty* p = *plist;
4028 if (p == NULL) {
4029 *plist = new_p;
4030 } else {
4031 while (p->next() != NULL) {
4032 p = p->next();
4033 }
4034 p->set_next(new_p);
4035 }
4036 }
4038 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4039 if (plist == NULL)
4040 return;
4042 SystemProperty* new_p = new SystemProperty(k, v, true);
4043 PropertyList_add(plist, new_p);
4044 }
4046 // This add maintains unique property key in the list.
4047 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4048 if (plist == NULL)
4049 return;
4051 // If property key exist then update with new value.
4052 SystemProperty* prop;
4053 for (prop = *plist; prop != NULL; prop = prop->next()) {
4054 if (strcmp(k, prop->key()) == 0) {
4055 if (append) {
4056 prop->append_value(v);
4057 } else {
4058 prop->set_value(v);
4059 }
4060 return;
4061 }
4062 }
4064 PropertyList_add(plist, k, v);
4065 }
4067 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4068 // Returns true if all of the source pointed by src has been copied over to
4069 // the destination buffer pointed by buf. Otherwise, returns false.
4070 // Notes:
4071 // 1. If the length (buflen) of the destination buffer excluding the
4072 // NULL terminator character is not long enough for holding the expanded
4073 // pid characters, it also returns false instead of returning the partially
4074 // expanded one.
4075 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4076 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4077 char* buf, size_t buflen) {
4078 const char* p = src;
4079 char* b = buf;
4080 const char* src_end = &src[srclen];
4081 char* buf_end = &buf[buflen - 1];
4083 while (p < src_end && b < buf_end) {
4084 if (*p == '%') {
4085 switch (*(++p)) {
4086 case '%': // "%%" ==> "%"
4087 *b++ = *p++;
4088 break;
4089 case 'p': { // "%p" ==> current process id
4090 // buf_end points to the character before the last character so
4091 // that we could write '\0' to the end of the buffer.
4092 size_t buf_sz = buf_end - b + 1;
4093 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4095 // if jio_snprintf fails or the buffer is not long enough to hold
4096 // the expanded pid, returns false.
4097 if (ret < 0 || ret >= (int)buf_sz) {
4098 return false;
4099 } else {
4100 b += ret;
4101 assert(*b == '\0', "fail in copy_expand_pid");
4102 if (p == src_end && b == buf_end + 1) {
4103 // reach the end of the buffer.
4104 return true;
4105 }
4106 }
4107 p++;
4108 break;
4109 }
4110 default :
4111 *b++ = '%';
4112 }
4113 } else {
4114 *b++ = *p++;
4115 }
4116 }
4117 *b = '\0';
4118 return (p == src_end); // return false if not all of the source was copied
4119 }