Thu, 27 Feb 2020 05:40:59 +0000
8187078: -XX:+VerifyOops finds numerous problems when running JPRT
Reviewed-by: andrew
1 /*
2 * Copyright (c) 1997, 2019, 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 #ifdef VENDOR_URL_VM_BUG
70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
71 #else
72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
73 #endif
74 #define DEFAULT_JAVA_LAUNCHER "generic"
76 // Disable options not supported in this release, with a warning if they
77 // were explicitly requested on the command-line
78 #define UNSUPPORTED_OPTION(opt, description) \
79 do { \
80 if (opt) { \
81 if (FLAG_IS_CMDLINE(opt)) { \
82 warning(description " is disabled in this release."); \
83 } \
84 FLAG_SET_DEFAULT(opt, false); \
85 } \
86 } while(0)
88 #define UNSUPPORTED_GC_OPTION(gc) \
89 do { \
90 if (gc) { \
91 if (FLAG_IS_CMDLINE(gc)) { \
92 warning(#gc " is not supported in this VM. Using Serial GC."); \
93 } \
94 FLAG_SET_DEFAULT(gc, false); \
95 } \
96 } while(0)
98 char** Arguments::_jvm_flags_array = NULL;
99 int Arguments::_num_jvm_flags = 0;
100 char** Arguments::_jvm_args_array = NULL;
101 int Arguments::_num_jvm_args = 0;
102 char* Arguments::_java_command = NULL;
103 SystemProperty* Arguments::_system_properties = NULL;
104 const char* Arguments::_gc_log_filename = NULL;
105 bool Arguments::_has_profile = false;
106 size_t Arguments::_conservative_max_heap_alignment = 0;
107 uintx Arguments::_min_heap_size = 0;
108 uintx Arguments::_min_heap_free_ratio = 0;
109 uintx Arguments::_max_heap_free_ratio = 0;
110 Arguments::Mode Arguments::_mode = _mixed;
111 bool Arguments::_java_compiler = false;
112 bool Arguments::_xdebug_mode = false;
113 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
114 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
115 int Arguments::_sun_java_launcher_pid = -1;
116 bool Arguments::_created_by_gamma_launcher = false;
118 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
119 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
120 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
121 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
122 bool Arguments::_ClipInlining = ClipInlining;
124 char* Arguments::SharedArchivePath = NULL;
126 AgentLibraryList Arguments::_libraryList;
127 AgentLibraryList Arguments::_agentList;
129 abort_hook_t Arguments::_abort_hook = NULL;
130 exit_hook_t Arguments::_exit_hook = NULL;
131 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
134 SystemProperty *Arguments::_java_ext_dirs = NULL;
135 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
136 SystemProperty *Arguments::_sun_boot_library_path = NULL;
137 SystemProperty *Arguments::_java_library_path = NULL;
138 SystemProperty *Arguments::_java_home = NULL;
139 SystemProperty *Arguments::_java_class_path = NULL;
140 SystemProperty *Arguments::_sun_boot_class_path = NULL;
142 char* Arguments::_meta_index_path = NULL;
143 char* Arguments::_meta_index_dir = NULL;
145 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
147 static bool match_option(const JavaVMOption *option, const char* name,
148 const char** tail) {
149 int len = (int)strlen(name);
150 if (strncmp(option->optionString, name, len) == 0) {
151 *tail = option->optionString + len;
152 return true;
153 } else {
154 return false;
155 }
156 }
158 static void logOption(const char* opt) {
159 if (PrintVMOptions) {
160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
161 }
162 }
164 // Process java launcher properties.
165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
166 // See if sun.java.launcher or sun.java.launcher.pid is defined.
167 // Must do this before setting up other system properties,
168 // as some of them may depend on launcher type.
169 for (int index = 0; index < args->nOptions; index++) {
170 const JavaVMOption* option = args->options + index;
171 const char* tail;
173 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
174 process_java_launcher_argument(tail, option->extraInfo);
175 continue;
176 }
177 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
178 _sun_java_launcher_pid = atoi(tail);
179 continue;
180 }
181 }
182 }
184 // Initialize system properties key and value.
185 void Arguments::init_system_properties() {
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
188 "Java Virtual Machine Specification", false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
190 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
193 // following are JVMTI agent writeable properties.
194 // Properties values are set to NULL and they are
195 // os specific they are initialized in os::init_system_properties_values().
196 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
197 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
199 _java_library_path = new SystemProperty("java.library.path", NULL, true);
200 _java_home = new SystemProperty("java.home", NULL, true);
201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
203 _java_class_path = new SystemProperty("java.class.path", "", true);
205 // Add to System Property list.
206 PropertyList_add(&_system_properties, _java_ext_dirs);
207 PropertyList_add(&_system_properties, _java_endorsed_dirs);
208 PropertyList_add(&_system_properties, _sun_boot_library_path);
209 PropertyList_add(&_system_properties, _java_library_path);
210 PropertyList_add(&_system_properties, _java_home);
211 PropertyList_add(&_system_properties, _java_class_path);
212 PropertyList_add(&_system_properties, _sun_boot_class_path);
214 // Set OS specific system properties values
215 os::init_system_properties_values();
216 }
219 // Update/Initialize System properties after JDK version number is known
220 void Arguments::init_version_specific_system_properties() {
221 enum { bufsz = 16 };
222 char buffer[bufsz];
223 const char* spec_vendor = "Sun Microsystems Inc.";
224 uint32_t spec_version = 0;
226 if (JDK_Version::is_gte_jdk17x_version()) {
227 spec_vendor = "Oracle Corporation";
228 spec_version = JDK_Version::current().major_version();
229 }
230 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.specification.version", buffer, false));
236 PropertyList_add(&_system_properties,
237 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
238 }
240 /**
241 * Provide a slightly more user-friendly way of eliminating -XX flags.
242 * When a flag is eliminated, it can be added to this list in order to
243 * continue accepting this flag on the command-line, while issuing a warning
244 * and ignoring the value. Once the JDK version reaches the 'accept_until'
245 * limit, we flatly refuse to admit the existence of the flag. This allows
246 * a flag to die correctly over JDK releases using HSX.
247 */
248 typedef struct {
249 const char* name;
250 JDK_Version obsoleted_in; // when the flag went away
251 JDK_Version accept_until; // which version to start denying the existence
252 } ObsoleteFlag;
254 static ObsoleteFlag obsolete_jvm_flags[] = {
255 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
267 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
268 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
269 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
270 { "DefaultInitialRAMFraction",
271 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
272 { "UseDepthFirstScavengeOrder",
273 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
274 { "HandlePromotionFailure",
275 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
276 { "MaxLiveObjectEvacuationRatio",
277 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
278 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
279 { "UseParallelOldGCCompacting",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "UseParallelDensePrefixUpdate",
282 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
283 { "UseParallelOldGCDensePrefix",
284 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
285 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
286 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
287 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
305 { "UseOldInlining", JDK_Version::jdk_update(8, 20), JDK_Version::jdk(10) },
306 { "AutoShutdownNMT", JDK_Version::jdk_update(8, 40), JDK_Version::jdk(10) },
307 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "SegmentedHeapDumpThreshold", JDK_Version::jdk_update(8, 252), JDK_Version::jdk(10) },
309 #ifdef PRODUCT
310 { "DesiredMethodLimit",
311 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
312 #endif // PRODUCT
313 { NULL, JDK_Version(0), JDK_Version(0) }
314 };
316 // Returns true if the flag is obsolete and fits into the range specified
317 // for being ignored. In the case that the flag is ignored, the 'version'
318 // value is filled in with the version number when the flag became
319 // obsolete so that that value can be displayed to the user.
320 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
321 int i = 0;
322 assert(version != NULL, "Must provide a version buffer");
323 while (obsolete_jvm_flags[i].name != NULL) {
324 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
325 // <flag>=xxx form
326 // [-|+]<flag> form
327 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
328 ((s[0] == '+' || s[0] == '-') &&
329 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
330 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
331 *version = flag_status.obsoleted_in;
332 return true;
333 }
334 }
335 i++;
336 }
337 return false;
338 }
340 // Constructs the system class path (aka boot class path) from the following
341 // components, in order:
342 //
343 // prefix // from -Xbootclasspath/p:...
344 // endorsed // the expansion of -Djava.endorsed.dirs=...
345 // base // from os::get_system_properties() or -Xbootclasspath=
346 // suffix // from -Xbootclasspath/a:...
347 //
348 // java.endorsed.dirs is a list of directories; any jar or zip files in the
349 // directories are added to the sysclasspath just before the base.
350 //
351 // This could be AllStatic, but it isn't needed after argument processing is
352 // complete.
353 class SysClassPath: public StackObj {
354 public:
355 SysClassPath(const char* base);
356 ~SysClassPath();
358 inline void set_base(const char* base);
359 inline void add_prefix(const char* prefix);
360 inline void add_suffix_to_prefix(const char* suffix);
361 inline void add_suffix(const char* suffix);
362 inline void reset_path(const char* base);
364 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
365 // property. Must be called after all command-line arguments have been
366 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
367 // combined_path().
368 void expand_endorsed();
370 inline const char* get_base() const { return _items[_scp_base]; }
371 inline const char* get_prefix() const { return _items[_scp_prefix]; }
372 inline const char* get_suffix() const { return _items[_scp_suffix]; }
373 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
375 // Combine all the components into a single c-heap-allocated string; caller
376 // must free the string if/when no longer needed.
377 char* combined_path();
379 private:
380 // Utility routines.
381 static char* add_to_path(const char* path, const char* str, bool prepend);
382 static char* add_jars_to_path(char* path, const char* directory);
384 inline void reset_item_at(int index);
386 // Array indices for the items that make up the sysclasspath. All except the
387 // base are allocated in the C heap and freed by this class.
388 enum {
389 _scp_prefix, // from -Xbootclasspath/p:...
390 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
391 _scp_base, // the default sysclasspath
392 _scp_suffix, // from -Xbootclasspath/a:...
393 _scp_nitems // the number of items, must be last.
394 };
396 const char* _items[_scp_nitems];
397 DEBUG_ONLY(bool _expansion_done;)
398 };
400 SysClassPath::SysClassPath(const char* base) {
401 memset(_items, 0, sizeof(_items));
402 _items[_scp_base] = base;
403 DEBUG_ONLY(_expansion_done = false;)
404 }
406 SysClassPath::~SysClassPath() {
407 // Free everything except the base.
408 for (int i = 0; i < _scp_nitems; ++i) {
409 if (i != _scp_base) reset_item_at(i);
410 }
411 DEBUG_ONLY(_expansion_done = false;)
412 }
414 inline void SysClassPath::set_base(const char* base) {
415 _items[_scp_base] = base;
416 }
418 inline void SysClassPath::add_prefix(const char* prefix) {
419 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
420 }
422 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
423 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
424 }
426 inline void SysClassPath::add_suffix(const char* suffix) {
427 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
428 }
430 inline void SysClassPath::reset_item_at(int index) {
431 assert(index < _scp_nitems && index != _scp_base, "just checking");
432 if (_items[index] != NULL) {
433 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
434 _items[index] = NULL;
435 }
436 }
438 inline void SysClassPath::reset_path(const char* base) {
439 // Clear the prefix and suffix.
440 reset_item_at(_scp_prefix);
441 reset_item_at(_scp_suffix);
442 set_base(base);
443 }
445 //------------------------------------------------------------------------------
447 void SysClassPath::expand_endorsed() {
448 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
450 const char* path = Arguments::get_property("java.endorsed.dirs");
451 if (path == NULL) {
452 path = Arguments::get_endorsed_dir();
453 assert(path != NULL, "no default for java.endorsed.dirs");
454 }
456 char* expanded_path = NULL;
457 const char separator = *os::path_separator();
458 const char* const end = path + strlen(path);
459 while (path < end) {
460 const char* tmp_end = strchr(path, separator);
461 if (tmp_end == NULL) {
462 expanded_path = add_jars_to_path(expanded_path, path);
463 path = end;
464 } else {
465 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
466 memcpy(dirpath, path, tmp_end - path);
467 dirpath[tmp_end - path] = '\0';
468 expanded_path = add_jars_to_path(expanded_path, dirpath);
469 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
470 path = tmp_end + 1;
471 }
472 }
473 _items[_scp_endorsed] = expanded_path;
474 DEBUG_ONLY(_expansion_done = true;)
475 }
477 // Combine the bootclasspath elements, some of which may be null, into a single
478 // c-heap-allocated string.
479 char* SysClassPath::combined_path() {
480 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
481 assert(_expansion_done, "must call expand_endorsed() first.");
483 size_t lengths[_scp_nitems];
484 size_t total_len = 0;
486 const char separator = *os::path_separator();
488 // Get the lengths.
489 int i;
490 for (i = 0; i < _scp_nitems; ++i) {
491 if (_items[i] != NULL) {
492 lengths[i] = strlen(_items[i]);
493 // Include space for the separator char (or a NULL for the last item).
494 total_len += lengths[i] + 1;
495 }
496 }
497 assert(total_len > 0, "empty sysclasspath not allowed");
499 // Copy the _items to a single string.
500 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
501 char* cp_tmp = cp;
502 for (i = 0; i < _scp_nitems; ++i) {
503 if (_items[i] != NULL) {
504 memcpy(cp_tmp, _items[i], lengths[i]);
505 cp_tmp += lengths[i];
506 *cp_tmp++ = separator;
507 }
508 }
509 *--cp_tmp = '\0'; // Replace the extra separator.
510 return cp;
511 }
513 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
514 char*
515 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
516 char *cp;
518 assert(str != NULL, "just checking");
519 if (path == NULL) {
520 size_t len = strlen(str) + 1;
521 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
522 memcpy(cp, str, len); // copy the trailing null
523 } else {
524 const char separator = *os::path_separator();
525 size_t old_len = strlen(path);
526 size_t str_len = strlen(str);
527 size_t len = old_len + str_len + 2;
529 if (prepend) {
530 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
531 char* cp_tmp = cp;
532 memcpy(cp_tmp, str, str_len);
533 cp_tmp += str_len;
534 *cp_tmp = separator;
535 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
536 FREE_C_HEAP_ARRAY(char, path, mtInternal);
537 } else {
538 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
539 char* cp_tmp = cp + old_len;
540 *cp_tmp = separator;
541 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
542 }
543 }
544 return cp;
545 }
547 // Scan the directory and append any jar or zip files found to path.
548 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
549 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
550 DIR* dir = os::opendir(directory);
551 if (dir == NULL) return path;
553 char dir_sep[2] = { '\0', '\0' };
554 size_t directory_len = strlen(directory);
555 const char fileSep = *os::file_separator();
556 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
558 /* Scan the directory for jars/zips, appending them to path. */
559 struct dirent *entry;
560 while ((entry = os::readdir(dir)) != NULL) {
561 const char* name = entry->d_name;
562 const char* ext = name + strlen(name) - 4;
563 bool isJarOrZip = ext > name &&
564 (os::file_name_strcmp(ext, ".jar") == 0 ||
565 os::file_name_strcmp(ext, ".zip") == 0);
566 if (isJarOrZip) {
567 size_t length = directory_len + 2 + strlen(name);
568 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
569 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
570 path = add_to_path(path, jarpath, false);
571 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
572 }
573 }
574 os::closedir(dir);
575 return path;
576 }
578 // Parses a memory size specification string.
579 static bool atomull(const char *s, julong* result) {
580 julong n = 0;
581 int args_read = sscanf(s, JULONG_FORMAT, &n);
582 if (args_read != 1) {
583 return false;
584 }
585 while (*s != '\0' && isdigit(*s)) {
586 s++;
587 }
588 // 4705540: illegal if more characters are found after the first non-digit
589 if (strlen(s) > 1) {
590 return false;
591 }
592 switch (*s) {
593 case 'T': case 't':
594 *result = n * G * K;
595 // Check for overflow.
596 if (*result/((julong)G * K) != n) return false;
597 return true;
598 case 'G': case 'g':
599 *result = n * G;
600 if (*result/G != n) return false;
601 return true;
602 case 'M': case 'm':
603 *result = n * M;
604 if (*result/M != n) return false;
605 return true;
606 case 'K': case 'k':
607 *result = n * K;
608 if (*result/K != n) return false;
609 return true;
610 case '\0':
611 *result = n;
612 return true;
613 default:
614 return false;
615 }
616 }
618 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
619 if (size < min_size) return arg_too_small;
620 // Check that size will fit in a size_t (only relevant on 32-bit)
621 if (size > max_uintx) return arg_too_big;
622 return arg_in_range;
623 }
625 // Describe an argument out of range error
626 void Arguments::describe_range_error(ArgsRange errcode) {
627 switch(errcode) {
628 case arg_too_big:
629 jio_fprintf(defaultStream::error_stream(),
630 "The specified size exceeds the maximum "
631 "representable size.\n");
632 break;
633 case arg_too_small:
634 case arg_unreadable:
635 case arg_in_range:
636 // do nothing for now
637 break;
638 default:
639 ShouldNotReachHere();
640 }
641 }
643 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
644 return CommandLineFlags::boolAtPut(name, &value, origin);
645 }
647 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
648 double v;
649 if (sscanf(value, "%lf", &v) != 1) {
650 return false;
651 }
653 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
654 return true;
655 }
656 return false;
657 }
659 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
660 julong v;
661 intx intx_v;
662 bool is_neg = false;
663 // Check the sign first since atomull() parses only unsigned values.
664 if (*value == '-') {
665 if (!CommandLineFlags::intxAt(name, &intx_v)) {
666 return false;
667 }
668 value++;
669 is_neg = true;
670 }
671 if (!atomull(value, &v)) {
672 return false;
673 }
674 intx_v = (intx) v;
675 if (is_neg) {
676 intx_v = -intx_v;
677 }
678 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
679 return true;
680 }
681 uintx uintx_v = (uintx) v;
682 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
683 return true;
684 }
685 uint64_t uint64_t_v = (uint64_t) v;
686 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
687 return true;
688 }
689 return false;
690 }
692 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
693 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
694 // Contract: CommandLineFlags always returns a pointer that needs freeing.
695 FREE_C_HEAP_ARRAY(char, value, mtInternal);
696 return true;
697 }
699 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
700 const char* old_value = "";
701 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
702 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
703 size_t new_len = strlen(new_value);
704 const char* value;
705 char* free_this_too = NULL;
706 if (old_len == 0) {
707 value = new_value;
708 } else if (new_len == 0) {
709 value = old_value;
710 } else {
711 size_t length = old_len + 1 + new_len + 1;
712 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
713 // each new setting adds another LINE to the switch:
714 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
715 value = buf;
716 free_this_too = buf;
717 }
718 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
719 // CommandLineFlags always returns a pointer that needs freeing.
720 FREE_C_HEAP_ARRAY(char, value, mtInternal);
721 if (free_this_too != NULL) {
722 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
723 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
724 }
725 return true;
726 }
728 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
730 // range of acceptable characters spelled out for portability reasons
731 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
732 #define BUFLEN 255
733 char name[BUFLEN+1];
734 char dummy;
736 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
737 return set_bool_flag(name, false, origin);
738 }
739 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
740 return set_bool_flag(name, true, origin);
741 }
743 char punct;
744 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
745 const char* value = strchr(arg, '=') + 1;
746 Flag* flag = Flag::find_flag(name, strlen(name));
747 if (flag != NULL && flag->is_ccstr()) {
748 if (flag->ccstr_accumulates()) {
749 return append_to_string_flag(name, value, origin);
750 } else {
751 if (value[0] == '\0') {
752 value = NULL;
753 }
754 return set_string_flag(name, value, origin);
755 }
756 }
757 }
759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
760 const char* value = strchr(arg, '=') + 1;
761 // -XX:Foo:=xxx will reset the string flag to the given value.
762 if (value[0] == '\0') {
763 value = NULL;
764 }
765 return set_string_flag(name, value, origin);
766 }
768 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
769 #define SIGNED_NUMBER_RANGE "[-0123456789]"
770 #define NUMBER_RANGE "[0123456789]"
771 char value[BUFLEN + 1];
772 char value2[BUFLEN + 1];
773 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
774 // Looks like a floating-point number -- try again with more lenient format string
775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
776 return set_fp_numeric_flag(name, value, origin);
777 }
778 }
780 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
781 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
782 return set_numeric_flag(name, value, origin);
783 }
785 return false;
786 }
788 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
789 assert(bldarray != NULL, "illegal argument");
791 if (arg == NULL) {
792 return;
793 }
795 int new_count = *count + 1;
797 // expand the array and add arg to the last element
798 if (*bldarray == NULL) {
799 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
800 } else {
801 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
802 }
803 (*bldarray)[*count] = strdup(arg);
804 *count = new_count;
805 }
807 void Arguments::build_jvm_args(const char* arg) {
808 add_string(&_jvm_args_array, &_num_jvm_args, arg);
809 }
811 void Arguments::build_jvm_flags(const char* arg) {
812 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
813 }
815 // utility function to return a string that concatenates all
816 // strings in a given char** array
817 const char* Arguments::build_resource_string(char** args, int count) {
818 if (args == NULL || count == 0) {
819 return NULL;
820 }
821 size_t length = 0;
822 for (int i = 0; i < count; i++) {
823 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
824 }
825 char* s = NEW_RESOURCE_ARRAY(char, length);
826 char* dst = s;
827 for (int j = 0; j < count; j++) {
828 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
829 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
830 dst += offset;
831 length -= offset;
832 }
833 return (const char*) s;
834 }
836 void Arguments::print_on(outputStream* st) {
837 st->print_cr("VM Arguments:");
838 if (num_jvm_flags() > 0) {
839 st->print("jvm_flags: "); print_jvm_flags_on(st);
840 }
841 if (num_jvm_args() > 0) {
842 st->print("jvm_args: "); print_jvm_args_on(st);
843 }
844 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
845 if (_java_class_path != NULL) {
846 char* path = _java_class_path->value();
847 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
848 }
849 st->print_cr("Launcher Type: %s", _sun_java_launcher);
850 }
852 void Arguments::print_jvm_flags_on(outputStream* st) {
853 if (_num_jvm_flags > 0) {
854 for (int i=0; i < _num_jvm_flags; i++) {
855 st->print("%s ", _jvm_flags_array[i]);
856 }
857 st->cr();
858 }
859 }
861 void Arguments::print_jvm_args_on(outputStream* st) {
862 if (_num_jvm_args > 0) {
863 for (int i=0; i < _num_jvm_args; i++) {
864 st->print("%s ", _jvm_args_array[i]);
865 }
866 st->cr();
867 }
868 }
870 bool Arguments::process_argument(const char* arg,
871 jboolean ignore_unrecognized, Flag::Flags origin) {
873 JDK_Version since = JDK_Version();
875 if (parse_argument(arg, origin) || ignore_unrecognized) {
876 return true;
877 }
879 bool has_plus_minus = (*arg == '+' || *arg == '-');
880 const char* const argname = has_plus_minus ? arg + 1 : arg;
881 if (is_newly_obsolete(arg, &since)) {
882 char version[256];
883 since.to_string(version, sizeof(version));
884 warning("ignoring option %s; support was removed in %s", argname, version);
885 return true;
886 }
888 // For locked flags, report a custom error message if available.
889 // Otherwise, report the standard unrecognized VM option.
891 size_t arg_len;
892 const char* equal_sign = strchr(argname, '=');
893 if (equal_sign == NULL) {
894 arg_len = strlen(argname);
895 } else {
896 arg_len = equal_sign - argname;
897 }
899 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
900 if (found_flag != NULL) {
901 char locked_message_buf[BUFLEN];
902 found_flag->get_locked_message(locked_message_buf, BUFLEN);
903 if (strlen(locked_message_buf) == 0) {
904 if (found_flag->is_bool() && !has_plus_minus) {
905 jio_fprintf(defaultStream::error_stream(),
906 "Missing +/- setting for VM option '%s'\n", argname);
907 } else if (!found_flag->is_bool() && has_plus_minus) {
908 jio_fprintf(defaultStream::error_stream(),
909 "Unexpected +/- setting in VM option '%s'\n", argname);
910 } else {
911 jio_fprintf(defaultStream::error_stream(),
912 "Improperly specified VM option '%s'\n", argname);
913 }
914 } else {
915 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
916 }
917 } else {
918 jio_fprintf(defaultStream::error_stream(),
919 "Unrecognized VM option '%s'\n", argname);
920 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
921 if (fuzzy_matched != NULL) {
922 jio_fprintf(defaultStream::error_stream(),
923 "Did you mean '%s%s%s'?\n",
924 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
925 fuzzy_matched->_name,
926 (fuzzy_matched->is_bool()) ? "" : "=<value>");
927 }
928 }
930 // allow for commandline "commenting out" options like -XX:#+Verbose
931 return arg[0] == '#';
932 }
934 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
935 FILE* stream = fopen(file_name, "rb");
936 if (stream == NULL) {
937 if (should_exist) {
938 jio_fprintf(defaultStream::error_stream(),
939 "Could not open settings file %s\n", file_name);
940 return false;
941 } else {
942 return true;
943 }
944 }
946 char token[1024];
947 int pos = 0;
949 bool in_white_space = true;
950 bool in_comment = false;
951 bool in_quote = false;
952 char quote_c = 0;
953 bool result = true;
955 int c = getc(stream);
956 while(c != EOF && pos < (int)(sizeof(token)-1)) {
957 if (in_white_space) {
958 if (in_comment) {
959 if (c == '\n') in_comment = false;
960 } else {
961 if (c == '#') in_comment = true;
962 else if (!isspace(c)) {
963 in_white_space = false;
964 token[pos++] = c;
965 }
966 }
967 } else {
968 if (c == '\n' || (!in_quote && isspace(c))) {
969 // token ends at newline, or at unquoted whitespace
970 // this allows a way to include spaces in string-valued options
971 token[pos] = '\0';
972 logOption(token);
973 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
974 build_jvm_flags(token);
975 pos = 0;
976 in_white_space = true;
977 in_quote = false;
978 } else if (!in_quote && (c == '\'' || c == '"')) {
979 in_quote = true;
980 quote_c = c;
981 } else if (in_quote && (c == quote_c)) {
982 in_quote = false;
983 } else {
984 token[pos++] = c;
985 }
986 }
987 c = getc(stream);
988 }
989 if (pos > 0) {
990 token[pos] = '\0';
991 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
992 build_jvm_flags(token);
993 }
994 fclose(stream);
995 return result;
996 }
998 //=============================================================================================================
999 // Parsing of properties (-D)
1001 const char* Arguments::get_property(const char* key) {
1002 return PropertyList_get_value(system_properties(), key);
1003 }
1005 bool Arguments::add_property(const char* prop) {
1006 const char* eq = strchr(prop, '=');
1007 char* key;
1008 // ns must be static--its address may be stored in a SystemProperty object.
1009 const static char ns[1] = {0};
1010 char* value = (char *)ns;
1012 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1013 key = AllocateHeap(key_len + 1, mtInternal);
1014 strncpy(key, prop, key_len);
1015 key[key_len] = '\0';
1017 if (eq != NULL) {
1018 size_t value_len = strlen(prop) - key_len - 1;
1019 value = AllocateHeap(value_len + 1, mtInternal);
1020 strncpy(value, &prop[key_len + 1], value_len + 1);
1021 }
1023 if (strcmp(key, "java.compiler") == 0) {
1024 process_java_compiler_argument(value);
1025 FreeHeap(key);
1026 if (eq != NULL) {
1027 FreeHeap(value);
1028 }
1029 return true;
1030 } else if (strcmp(key, "sun.java.command") == 0) {
1031 _java_command = value;
1033 // Record value in Arguments, but let it get passed to Java.
1034 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1035 // launcher.pid property is private and is processed
1036 // in process_sun_java_launcher_properties();
1037 // the sun.java.launcher property is passed on to the java application
1038 FreeHeap(key);
1039 if (eq != NULL) {
1040 FreeHeap(value);
1041 }
1042 return true;
1043 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1044 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1045 // its value without going through the property list or making a Java call.
1046 _java_vendor_url_bug = value;
1047 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1048 PropertyList_unique_add(&_system_properties, key, value, true);
1049 return true;
1050 }
1051 // Create new property and add at the end of the list
1052 PropertyList_unique_add(&_system_properties, key, value);
1053 return true;
1054 }
1056 //===========================================================================================================
1057 // Setting int/mixed/comp mode flags
1059 void Arguments::set_mode_flags(Mode mode) {
1060 // Set up default values for all flags.
1061 // If you add a flag to any of the branches below,
1062 // add a default value for it here.
1063 set_java_compiler(false);
1064 _mode = mode;
1066 // Ensure Agent_OnLoad has the correct initial values.
1067 // This may not be the final mode; mode may change later in onload phase.
1068 PropertyList_unique_add(&_system_properties, "java.vm.info",
1069 (char*)VM_Version::vm_info_string(), false);
1071 UseInterpreter = true;
1072 UseCompiler = true;
1073 UseLoopCounter = true;
1075 #ifndef ZERO
1076 // Turn these off for mixed and comp. Leave them on for Zero.
1077 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1078 UseFastAccessorMethods = (mode == _int);
1079 }
1080 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1081 UseFastEmptyMethods = (mode == _int);
1082 }
1083 #endif
1085 // Default values may be platform/compiler dependent -
1086 // use the saved values
1087 ClipInlining = Arguments::_ClipInlining;
1088 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1089 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1090 BackgroundCompilation = Arguments::_BackgroundCompilation;
1092 // Change from defaults based on mode
1093 switch (mode) {
1094 default:
1095 ShouldNotReachHere();
1096 break;
1097 case _int:
1098 UseCompiler = false;
1099 UseLoopCounter = false;
1100 AlwaysCompileLoopMethods = false;
1101 UseOnStackReplacement = false;
1102 break;
1103 case _mixed:
1104 // same as default
1105 break;
1106 case _comp:
1107 UseInterpreter = false;
1108 BackgroundCompilation = false;
1109 ClipInlining = false;
1110 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1111 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1112 // compile a level 4 (C2) and then continue executing it.
1113 if (TieredCompilation) {
1114 Tier3InvokeNotifyFreqLog = 0;
1115 Tier4InvocationThreshold = 0;
1116 }
1117 break;
1118 }
1119 }
1121 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1122 // Conflict: required to use shared spaces (-Xshare:on), but
1123 // incompatible command line options were chosen.
1125 static void no_shared_spaces(const char* message) {
1126 if (RequireSharedSpaces) {
1127 jio_fprintf(defaultStream::error_stream(),
1128 "Class data sharing is inconsistent with other specified options.\n");
1129 vm_exit_during_initialization("Unable to use shared archive.", message);
1130 } else {
1131 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1132 }
1133 }
1134 #endif
1136 void Arguments::set_tiered_flags() {
1137 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1138 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1139 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1140 }
1141 if (CompilationPolicyChoice < 2) {
1142 vm_exit_during_initialization(
1143 "Incompatible compilation policy selected", NULL);
1144 }
1145 // Increase the code cache size - tiered compiles a lot more.
1146 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1147 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1148 }
1149 if (!UseInterpreter) { // -Xcomp
1150 Tier3InvokeNotifyFreqLog = 0;
1151 Tier4InvocationThreshold = 0;
1152 }
1153 }
1155 /**
1156 * Returns the minimum number of compiler threads needed to run the JVM. The following
1157 * configurations are possible.
1158 *
1159 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1160 * compiler threads is 0.
1161 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1162 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1163 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1164 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1165 * C1 can be used, so the minimum number of compiler threads is 1.
1166 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1167 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1168 * the minimum number of compiler threads is 2.
1169 */
1170 int Arguments::get_min_number_of_compiler_threads() {
1171 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1172 return 0; // case 1
1173 #else
1174 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1175 return 1; // case 2 or case 3
1176 }
1177 return 2; // case 4 (tiered)
1178 #endif
1179 }
1181 #if INCLUDE_ALL_GCS
1182 static void disable_adaptive_size_policy(const char* collector_name) {
1183 if (UseAdaptiveSizePolicy) {
1184 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1185 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1186 collector_name);
1187 }
1188 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1189 }
1190 }
1192 void Arguments::set_parnew_gc_flags() {
1193 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1194 "control point invariant");
1195 assert(UseParNewGC, "Error");
1197 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1198 disable_adaptive_size_policy("UseParNewGC");
1200 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1201 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1202 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1203 } else if (ParallelGCThreads == 0) {
1204 jio_fprintf(defaultStream::error_stream(),
1205 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1206 vm_exit(1);
1207 }
1209 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1210 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1211 // we set them to 1024 and 1024.
1212 // See CR 6362902.
1213 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1214 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1215 }
1216 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1217 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1218 }
1220 // AlwaysTenure flag should make ParNew promote all at first collection.
1221 // See CR 6362902.
1222 if (AlwaysTenure) {
1223 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1224 }
1225 // When using compressed oops, we use local overflow stacks,
1226 // rather than using a global overflow list chained through
1227 // the klass word of the object's pre-image.
1228 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1229 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1230 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1231 }
1232 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1233 }
1234 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1235 }
1237 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1238 // sparc/solaris for certain applications, but would gain from
1239 // further optimization and tuning efforts, and would almost
1240 // certainly gain from analysis of platform and environment.
1241 void Arguments::set_cms_and_parnew_gc_flags() {
1242 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1243 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1245 // If we are using CMS, we prefer to UseParNewGC,
1246 // unless explicitly forbidden.
1247 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1248 FLAG_SET_ERGO(bool, UseParNewGC, true);
1249 }
1251 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1252 disable_adaptive_size_policy("UseConcMarkSweepGC");
1254 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1255 // as needed.
1256 if (UseParNewGC) {
1257 set_parnew_gc_flags();
1258 }
1260 size_t max_heap = align_size_down(MaxHeapSize,
1261 CardTableRS::ct_max_alignment_constraint());
1263 // Now make adjustments for CMS
1264 intx tenuring_default = (intx)6;
1265 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1267 // Preferred young gen size for "short" pauses:
1268 // upper bound depends on # of threads and NewRatio.
1269 const uintx parallel_gc_threads =
1270 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1271 const size_t preferred_max_new_size_unaligned =
1272 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1273 size_t preferred_max_new_size =
1274 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1276 // Unless explicitly requested otherwise, size young gen
1277 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1279 // If either MaxNewSize or NewRatio is set on the command line,
1280 // assume the user is trying to set the size of the young gen.
1281 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1283 // Set MaxNewSize to our calculated preferred_max_new_size unless
1284 // NewSize was set on the command line and it is larger than
1285 // preferred_max_new_size.
1286 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1287 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1288 } else {
1289 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1290 }
1291 if (PrintGCDetails && Verbose) {
1292 // Too early to use gclog_or_tty
1293 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1294 }
1296 // Code along this path potentially sets NewSize and OldSize
1297 if (PrintGCDetails && Verbose) {
1298 // Too early to use gclog_or_tty
1299 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1300 " initial_heap_size: " SIZE_FORMAT
1301 " max_heap: " SIZE_FORMAT,
1302 min_heap_size(), InitialHeapSize, max_heap);
1303 }
1304 size_t min_new = preferred_max_new_size;
1305 if (FLAG_IS_CMDLINE(NewSize)) {
1306 min_new = NewSize;
1307 }
1308 if (max_heap > min_new && min_heap_size() > min_new) {
1309 // Unless explicitly requested otherwise, make young gen
1310 // at least min_new, and at most preferred_max_new_size.
1311 if (FLAG_IS_DEFAULT(NewSize)) {
1312 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1313 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1314 if (PrintGCDetails && Verbose) {
1315 // Too early to use gclog_or_tty
1316 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1317 }
1318 }
1319 // Unless explicitly requested otherwise, size old gen
1320 // so it's NewRatio x of NewSize.
1321 if (FLAG_IS_DEFAULT(OldSize)) {
1322 if (max_heap > NewSize) {
1323 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1324 if (PrintGCDetails && Verbose) {
1325 // Too early to use gclog_or_tty
1326 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1327 }
1328 }
1329 }
1330 }
1331 }
1332 // Unless explicitly requested otherwise, definitely
1333 // promote all objects surviving "tenuring_default" scavenges.
1334 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1335 FLAG_IS_DEFAULT(SurvivorRatio)) {
1336 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1337 }
1338 // If we decided above (or user explicitly requested)
1339 // `promote all' (via MaxTenuringThreshold := 0),
1340 // prefer minuscule survivor spaces so as not to waste
1341 // space for (non-existent) survivors
1342 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1343 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1344 }
1345 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1346 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1347 // This is done in order to make ParNew+CMS configuration to work
1348 // with YoungPLABSize and OldPLABSize options.
1349 // See CR 6362902.
1350 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1351 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1352 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1353 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1354 // the value (either from the command line or ergonomics) of
1355 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1356 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1357 } else {
1358 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1359 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1360 // we'll let it to take precedence.
1361 jio_fprintf(defaultStream::error_stream(),
1362 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1363 " options are specified for the CMS collector."
1364 " CMSParPromoteBlocksToClaim will take precedence.\n");
1365 }
1366 }
1367 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1368 // OldPLAB sizing manually turned off: Use a larger default setting,
1369 // unless it was manually specified. This is because a too-low value
1370 // will slow down scavenges.
1371 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1372 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1373 }
1374 }
1375 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1376 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1377 // If either of the static initialization defaults have changed, note this
1378 // modification.
1379 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1380 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1381 }
1383 if (PrintGCDetails && Verbose) {
1384 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1385 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1386 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1387 }
1388 }
1389 #endif // INCLUDE_ALL_GCS
1391 void set_object_alignment() {
1392 // Object alignment.
1393 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1394 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1395 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1396 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1397 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1398 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1400 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1401 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1403 // Oop encoding heap max
1404 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1406 #if INCLUDE_ALL_GCS
1407 // Set CMS global values
1408 CompactibleFreeListSpace::set_cms_values();
1409 #endif // INCLUDE_ALL_GCS
1410 }
1412 bool verify_object_alignment() {
1413 // Object alignment.
1414 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1415 jio_fprintf(defaultStream::error_stream(),
1416 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1417 (int)ObjectAlignmentInBytes);
1418 return false;
1419 }
1420 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1421 jio_fprintf(defaultStream::error_stream(),
1422 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1423 (int)ObjectAlignmentInBytes, BytesPerLong);
1424 return false;
1425 }
1426 // It does not make sense to have big object alignment
1427 // since a space lost due to alignment will be greater
1428 // then a saved space from compressed oops.
1429 if ((int)ObjectAlignmentInBytes > 256) {
1430 jio_fprintf(defaultStream::error_stream(),
1431 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1432 (int)ObjectAlignmentInBytes);
1433 return false;
1434 }
1435 // In case page size is very small.
1436 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1437 jio_fprintf(defaultStream::error_stream(),
1438 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1439 (int)ObjectAlignmentInBytes, os::vm_page_size());
1440 return false;
1441 }
1442 if(SurvivorAlignmentInBytes == 0) {
1443 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1444 } else {
1445 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1446 jio_fprintf(defaultStream::error_stream(),
1447 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1448 (int)SurvivorAlignmentInBytes);
1449 return false;
1450 }
1451 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1452 jio_fprintf(defaultStream::error_stream(),
1453 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1454 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1455 return false;
1456 }
1457 }
1458 return true;
1459 }
1461 size_t Arguments::max_heap_for_compressed_oops() {
1462 // Avoid sign flip.
1463 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1464 // We need to fit both the NULL page and the heap into the memory budget, while
1465 // keeping alignment constraints of the heap. To guarantee the latter, as the
1466 // NULL page is located before the heap, we pad the NULL page to the conservative
1467 // maximum alignment that the GC may ever impose upon the heap.
1468 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1469 _conservative_max_heap_alignment);
1471 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1472 NOT_LP64(ShouldNotReachHere(); return 0);
1473 }
1475 bool Arguments::should_auto_select_low_pause_collector() {
1476 if (UseAutoGCSelectPolicy &&
1477 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1478 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1479 if (PrintGCDetails) {
1480 // Cannot use gclog_or_tty yet.
1481 tty->print_cr("Automatic selection of the low pause collector"
1482 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1483 }
1484 return true;
1485 }
1486 return false;
1487 }
1489 void Arguments::set_use_compressed_oops() {
1490 #ifndef ZERO
1491 #ifdef _LP64
1492 // MaxHeapSize is not set up properly at this point, but
1493 // the only value that can override MaxHeapSize if we are
1494 // to use UseCompressedOops is InitialHeapSize.
1495 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1497 if (max_heap_size <= max_heap_for_compressed_oops()) {
1498 #if !defined(COMPILER1) || defined(TIERED)
1499 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1500 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1501 }
1502 #endif
1503 #ifdef _WIN64
1504 if (UseLargePages && UseCompressedOops) {
1505 // Cannot allocate guard pages for implicit checks in indexed addressing
1506 // mode, when large pages are specified on windows.
1507 // This flag could be switched ON if narrow oop base address is set to 0,
1508 // see code in Universe::initialize_heap().
1509 Universe::set_narrow_oop_use_implicit_null_checks(false);
1510 }
1511 #endif // _WIN64
1512 } else {
1513 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1514 warning("Max heap size too large for Compressed Oops");
1515 FLAG_SET_DEFAULT(UseCompressedOops, false);
1516 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1517 }
1518 }
1519 #endif // _LP64
1520 #endif // ZERO
1521 }
1524 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1525 // set_use_compressed_oops().
1526 void Arguments::set_use_compressed_klass_ptrs() {
1527 #ifndef ZERO
1528 #ifdef _LP64
1529 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1530 if (!UseCompressedOops) {
1531 if (UseCompressedClassPointers) {
1532 warning("UseCompressedClassPointers requires UseCompressedOops");
1533 }
1534 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1535 } else {
1536 // Turn on UseCompressedClassPointers too
1537 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1538 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1539 }
1540 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1541 if (UseCompressedClassPointers) {
1542 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1543 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1544 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1545 }
1546 }
1547 }
1548 #endif // _LP64
1549 #endif // !ZERO
1550 }
1552 void Arguments::set_conservative_max_heap_alignment() {
1553 // The conservative maximum required alignment for the heap is the maximum of
1554 // the alignments imposed by several sources: any requirements from the heap
1555 // itself, the collector policy and the maximum page size we may run the VM
1556 // with.
1557 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1558 #if INCLUDE_ALL_GCS
1559 if (UseParallelGC) {
1560 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1561 } else if (UseG1GC) {
1562 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1563 }
1564 #endif // INCLUDE_ALL_GCS
1565 _conservative_max_heap_alignment = MAX4(heap_alignment,
1566 (size_t)os::vm_allocation_granularity(),
1567 os::max_page_size(),
1568 CollectorPolicy::compute_heap_alignment());
1569 }
1571 void Arguments::select_gc_ergonomically() {
1572 if (os::is_server_class_machine()) {
1573 if (should_auto_select_low_pause_collector()) {
1574 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1575 } else {
1576 FLAG_SET_ERGO(bool, UseParallelGC, true);
1577 }
1578 }
1579 }
1581 void Arguments::select_gc() {
1582 if (!gc_selected()) {
1583 select_gc_ergonomically();
1584 }
1585 }
1587 void Arguments::set_ergonomics_flags() {
1588 select_gc();
1590 #ifdef COMPILER2
1591 // Shared spaces work fine with other GCs but causes bytecode rewriting
1592 // to be disabled, which hurts interpreter performance and decreases
1593 // server performance. When -server is specified, keep the default off
1594 // unless it is asked for. Future work: either add bytecode rewriting
1595 // at link time, or rewrite bytecodes in non-shared methods.
1596 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1597 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1598 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1599 }
1600 #endif
1602 set_conservative_max_heap_alignment();
1604 #ifndef ZERO
1605 #ifdef _LP64
1606 set_use_compressed_oops();
1608 // set_use_compressed_klass_ptrs() must be called after calling
1609 // set_use_compressed_oops().
1610 set_use_compressed_klass_ptrs();
1612 // Also checks that certain machines are slower with compressed oops
1613 // in vm_version initialization code.
1614 #endif // _LP64
1615 #endif // !ZERO
1616 }
1618 void Arguments::set_parallel_gc_flags() {
1619 assert(UseParallelGC || UseParallelOldGC, "Error");
1620 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1621 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1622 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1623 }
1624 FLAG_SET_DEFAULT(UseParallelGC, true);
1626 // If no heap maximum was requested explicitly, use some reasonable fraction
1627 // of the physical memory, up to a maximum of 1GB.
1628 FLAG_SET_DEFAULT(ParallelGCThreads,
1629 Abstract_VM_Version::parallel_worker_threads());
1630 if (ParallelGCThreads == 0) {
1631 jio_fprintf(defaultStream::error_stream(),
1632 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1633 vm_exit(1);
1634 }
1636 if (UseAdaptiveSizePolicy) {
1637 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1638 // unless the user actually sets these flags.
1639 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1640 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1641 _min_heap_free_ratio = MinHeapFreeRatio;
1642 }
1643 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1644 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1645 _max_heap_free_ratio = MaxHeapFreeRatio;
1646 }
1647 }
1649 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1650 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1651 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1652 // See CR 6362902 for details.
1653 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1654 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1655 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1656 }
1657 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1658 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1659 }
1660 }
1662 if (UseParallelOldGC) {
1663 // Par compact uses lower default values since they are treated as
1664 // minimums. These are different defaults because of the different
1665 // interpretation and are not ergonomically set.
1666 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1667 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1668 }
1669 }
1670 }
1672 void Arguments::set_g1_gc_flags() {
1673 assert(UseG1GC, "Error");
1674 #ifdef COMPILER1
1675 FastTLABRefill = false;
1676 #endif
1677 FLAG_SET_DEFAULT(ParallelGCThreads,
1678 Abstract_VM_Version::parallel_worker_threads());
1679 if (ParallelGCThreads == 0) {
1680 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1681 }
1683 #if INCLUDE_ALL_GCS
1684 if (G1ConcRefinementThreads == 0) {
1685 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1686 }
1687 #endif
1689 // MarkStackSize will be set (if it hasn't been set by the user)
1690 // when concurrent marking is initialized.
1691 // Its value will be based upon the number of parallel marking threads.
1692 // But we do set the maximum mark stack size here.
1693 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1694 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1695 }
1697 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1698 // In G1, we want the default GC overhead goal to be higher than
1699 // say in PS. So we set it here to 10%. Otherwise the heap might
1700 // be expanded more aggressively than we would like it to. In
1701 // fact, even 10% seems to not be high enough in some cases
1702 // (especially small GC stress tests that the main thing they do
1703 // is allocation). We might consider increase it further.
1704 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1705 }
1707 if (PrintGCDetails && Verbose) {
1708 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1709 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1710 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1711 }
1712 }
1714 #if !INCLUDE_ALL_GCS
1715 #ifdef ASSERT
1716 static bool verify_serial_gc_flags() {
1717 return (UseSerialGC &&
1718 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1719 UseParallelGC || UseParallelOldGC));
1720 }
1721 #endif // ASSERT
1722 #endif // INCLUDE_ALL_GCS
1724 void Arguments::set_gc_specific_flags() {
1725 #if INCLUDE_ALL_GCS
1726 // Set per-collector flags
1727 if (UseParallelGC || UseParallelOldGC) {
1728 set_parallel_gc_flags();
1729 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1730 set_cms_and_parnew_gc_flags();
1731 } else if (UseParNewGC) { // Skipped if CMS is set above
1732 set_parnew_gc_flags();
1733 } else if (UseG1GC) {
1734 set_g1_gc_flags();
1735 }
1736 check_deprecated_gcs();
1737 check_deprecated_gc_flags();
1738 if (AssumeMP && !UseSerialGC) {
1739 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1740 warning("If the number of processors is expected to increase from one, then"
1741 " you should configure the number of parallel GC threads appropriately"
1742 " using -XX:ParallelGCThreads=N");
1743 }
1744 }
1745 if (MinHeapFreeRatio == 100) {
1746 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1747 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1748 }
1750 // If class unloading is disabled, also disable concurrent class unloading.
1751 if (!ClassUnloading) {
1752 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1753 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1754 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1755 }
1756 #else // INCLUDE_ALL_GCS
1757 assert(verify_serial_gc_flags(), "SerialGC unset");
1758 #endif // INCLUDE_ALL_GCS
1759 }
1761 julong Arguments::limit_by_allocatable_memory(julong limit) {
1762 julong max_allocatable;
1763 julong result = limit;
1764 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1765 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1766 }
1767 return result;
1768 }
1770 void Arguments::set_heap_size() {
1771 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1772 // Deprecated flag
1773 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1774 }
1776 julong phys_mem =
1777 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1778 : (julong)MaxRAM;
1780 // Experimental support for CGroup memory limits
1781 if (UseCGroupMemoryLimitForHeap) {
1782 // This is a rough indicator that a CGroup limit may be in force
1783 // for this process
1784 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1785 FILE *fp = fopen(lim_file, "r");
1786 if (fp != NULL) {
1787 julong cgroup_max = 0;
1788 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1789 if (ret == 1 && cgroup_max > 0) {
1790 // If unlimited, cgroup_max will be a very large, but unspecified
1791 // value, so use initial phys_mem as a limit
1792 if (PrintGCDetails && Verbose) {
1793 // Cannot use gclog_or_tty yet.
1794 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1795 JULONG_FORMAT "MB) and initial phys_mem ("
1796 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1797 }
1798 phys_mem = MIN2(cgroup_max, phys_mem);
1799 } else {
1800 warning("Unable to read/parse cgroup memory limit from %s: %s",
1801 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1802 }
1803 fclose(fp);
1804 } else {
1805 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1806 }
1807 }
1809 // Convert Fraction to Precentage values
1810 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1811 !FLAG_IS_DEFAULT(MaxRAMFraction))
1812 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1814 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1815 !FLAG_IS_DEFAULT(MinRAMFraction))
1816 MinRAMPercentage = 100.0 / MinRAMFraction;
1818 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1819 !FLAG_IS_DEFAULT(InitialRAMFraction))
1820 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1822 // If the maximum heap size has not been set with -Xmx,
1823 // then set it as fraction of the size of physical memory,
1824 // respecting the maximum and minimum sizes of the heap.
1825 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1826 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1827 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1828 if (reasonable_min < MaxHeapSize) {
1829 // Small physical memory, so use a minimum fraction of it for the heap
1830 reasonable_max = reasonable_min;
1831 } else {
1832 // Not-small physical memory, so require a heap at least
1833 // as large as MaxHeapSize
1834 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1835 }
1837 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1838 // Limit the heap size to ErgoHeapSizeLimit
1839 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1840 }
1841 if (UseCompressedOops) {
1842 // Limit the heap size to the maximum possible when using compressed oops
1843 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1844 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1845 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1846 // but it should be not less than default MaxHeapSize.
1847 max_coop_heap -= HeapBaseMinAddress;
1848 }
1849 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1850 }
1851 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1853 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1854 // An initial heap size was specified on the command line,
1855 // so be sure that the maximum size is consistent. Done
1856 // after call to limit_by_allocatable_memory because that
1857 // method might reduce the allocation size.
1858 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1859 }
1861 if (PrintGCDetails && Verbose) {
1862 // Cannot use gclog_or_tty yet.
1863 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1864 }
1865 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1866 }
1868 // If the minimum or initial heap_size have not been set or requested to be set
1869 // ergonomically, set them accordingly.
1870 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1871 julong reasonable_minimum = (julong)(OldSize + NewSize);
1873 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1875 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1877 if (InitialHeapSize == 0) {
1878 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1880 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1881 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1883 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1885 if (PrintGCDetails && Verbose) {
1886 // Cannot use gclog_or_tty yet.
1887 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1888 }
1889 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1890 }
1891 // If the minimum heap size has not been set (via -Xms),
1892 // synchronize with InitialHeapSize to avoid errors with the default value.
1893 if (min_heap_size() == 0) {
1894 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1895 if (PrintGCDetails && Verbose) {
1896 // Cannot use gclog_or_tty yet.
1897 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1898 }
1899 }
1900 }
1901 }
1903 // This option inspects the machine and attempts to set various
1904 // parameters to be optimal for long-running, memory allocation
1905 // intensive jobs. It is intended for machines with large
1906 // amounts of cpu and memory.
1907 jint Arguments::set_aggressive_heap_flags() {
1908 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1909 // VM, but we may not be able to represent the total physical memory
1910 // available (like having 8gb of memory on a box but using a 32bit VM).
1911 // Thus, we need to make sure we're using a julong for intermediate
1912 // calculations.
1913 julong initHeapSize;
1914 julong total_memory = os::physical_memory();
1916 if (total_memory < (julong) 256 * M) {
1917 jio_fprintf(defaultStream::error_stream(),
1918 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1919 vm_exit(1);
1920 }
1922 // The heap size is half of available memory, or (at most)
1923 // all of possible memory less 160mb (leaving room for the OS
1924 // when using ISM). This is the maximum; because adaptive sizing
1925 // is turned on below, the actual space used may be smaller.
1927 initHeapSize = MIN2(total_memory / (julong) 2,
1928 total_memory - (julong) 160 * M);
1930 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1932 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1933 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
1934 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
1935 // Currently the minimum size and the initial heap sizes are the same.
1936 set_min_heap_size(initHeapSize);
1937 }
1938 if (FLAG_IS_DEFAULT(NewSize)) {
1939 // Make the young generation 3/8ths of the total heap.
1940 FLAG_SET_CMDLINE(uintx, NewSize,
1941 ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
1942 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
1943 }
1945 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
1946 FLAG_SET_DEFAULT(UseLargePages, true);
1947 #endif
1949 // Increase some data structure sizes for efficiency
1950 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
1951 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
1952 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
1954 // See the OldPLABSize comment below, but replace 'after promotion'
1955 // with 'after copying'. YoungPLABSize is the size of the survivor
1956 // space per-gc-thread buffers. The default is 4kw.
1957 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words
1959 // OldPLABSize is the size of the buffers in the old gen that
1960 // UseParallelGC uses to promote live data that doesn't fit in the
1961 // survivor spaces. At any given time, there's one for each gc thread.
1962 // The default size is 1kw. These buffers are rarely used, since the
1963 // survivor spaces are usually big enough. For specjbb, however, there
1964 // are occasions when there's lots of live data in the young gen
1965 // and we end up promoting some of it. We don't have a definite
1966 // explanation for why bumping OldPLABSize helps, but the theory
1967 // is that a bigger PLAB results in retaining something like the
1968 // original allocation order after promotion, which improves mutator
1969 // locality. A minor effect may be that larger PLABs reduce the
1970 // number of PLAB allocation events during gc. The value of 8kw
1971 // was arrived at by experimenting with specjbb.
1972 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words
1974 // Enable parallel GC and adaptive generation sizing
1975 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
1977 // Encourage steady state memory management
1978 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
1980 // This appears to improve mutator locality
1981 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1983 // Get around early Solaris scheduling bug
1984 // (affinity vs other jobs on system)
1985 // but disallow DR and offlining (5008695).
1986 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
1988 return JNI_OK;
1989 }
1991 // This must be called after ergonomics because we want bytecode rewriting
1992 // if the server compiler is used, or if UseSharedSpaces is disabled.
1993 void Arguments::set_bytecode_flags() {
1994 // Better not attempt to store into a read-only space.
1995 if (UseSharedSpaces) {
1996 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1997 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1998 }
2000 if (!RewriteBytecodes) {
2001 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2002 }
2003 }
2005 // Aggressive optimization flags -XX:+AggressiveOpts
2006 void Arguments::set_aggressive_opts_flags() {
2007 #ifdef COMPILER2
2008 if (AggressiveUnboxing) {
2009 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2010 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2011 } else if (!EliminateAutoBox) {
2012 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2013 AggressiveUnboxing = false;
2014 }
2015 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2016 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2017 } else if (!DoEscapeAnalysis) {
2018 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2019 AggressiveUnboxing = false;
2020 }
2021 }
2022 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2023 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2024 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2025 }
2026 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2027 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2028 }
2030 // Feed the cache size setting into the JDK
2031 char buffer[1024];
2032 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2033 add_property(buffer);
2034 }
2035 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2036 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2037 }
2038 #endif
2040 if (AggressiveOpts) {
2041 // Sample flag setting code
2042 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2043 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2044 // }
2045 }
2046 }
2048 //===========================================================================================================
2049 // Parsing of java.compiler property
2051 void Arguments::process_java_compiler_argument(char* arg) {
2052 // For backwards compatibility, Djava.compiler=NONE or ""
2053 // causes us to switch to -Xint mode UNLESS -Xdebug
2054 // is also specified.
2055 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2056 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2057 }
2058 }
2060 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2061 _sun_java_launcher = strdup(launcher);
2062 if (strcmp("gamma", _sun_java_launcher) == 0) {
2063 _created_by_gamma_launcher = true;
2064 }
2065 }
2067 bool Arguments::created_by_java_launcher() {
2068 assert(_sun_java_launcher != NULL, "property must have value");
2069 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2070 }
2072 bool Arguments::created_by_gamma_launcher() {
2073 return _created_by_gamma_launcher;
2074 }
2076 //===========================================================================================================
2077 // Parsing of main arguments
2079 bool Arguments::verify_interval(uintx val, uintx min,
2080 uintx max, const char* name) {
2081 // Returns true iff value is in the inclusive interval [min..max]
2082 // false, otherwise.
2083 if (val >= min && val <= max) {
2084 return true;
2085 }
2086 jio_fprintf(defaultStream::error_stream(),
2087 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2088 " and " UINTX_FORMAT "\n",
2089 name, val, min, max);
2090 return false;
2091 }
2093 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2094 // Returns true if given value is at least specified min threshold
2095 // false, otherwise.
2096 if (val >= min ) {
2097 return true;
2098 }
2099 jio_fprintf(defaultStream::error_stream(),
2100 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2101 name, val, min);
2102 return false;
2103 }
2105 bool Arguments::verify_percentage(uintx value, const char* name) {
2106 if (is_percentage(value)) {
2107 return true;
2108 }
2109 jio_fprintf(defaultStream::error_stream(),
2110 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2111 name, value);
2112 return false;
2113 }
2115 // check if do gclog rotation
2116 // +UseGCLogFileRotation is a must,
2117 // no gc log rotation when log file not supplied or
2118 // NumberOfGCLogFiles is 0
2119 void check_gclog_consistency() {
2120 if (UseGCLogFileRotation) {
2121 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2122 jio_fprintf(defaultStream::output_stream(),
2123 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2124 "where num_of_file > 0\n"
2125 "GC log rotation is turned off\n");
2126 UseGCLogFileRotation = false;
2127 }
2128 }
2130 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2131 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2132 jio_fprintf(defaultStream::output_stream(),
2133 "GCLogFileSize changed to minimum 8K\n");
2134 }
2135 }
2137 // This function is called for -Xloggc:<filename>, it can be used
2138 // to check if a given file name(or string) conforms to the following
2139 // specification:
2140 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2141 // %p and %t only allowed once. We only limit usage of filename not path
2142 bool is_filename_valid(const char *file_name) {
2143 const char* p = file_name;
2144 char file_sep = os::file_separator()[0];
2145 const char* cp;
2146 // skip prefix path
2147 for (cp = file_name; *cp != '\0'; cp++) {
2148 if (*cp == '/' || *cp == file_sep) {
2149 p = cp + 1;
2150 }
2151 }
2153 int count_p = 0;
2154 int count_t = 0;
2155 while (*p != '\0') {
2156 if ((*p >= '0' && *p <= '9') ||
2157 (*p >= 'A' && *p <= 'Z') ||
2158 (*p >= 'a' && *p <= 'z') ||
2159 *p == '-' ||
2160 *p == '_' ||
2161 *p == '.') {
2162 p++;
2163 continue;
2164 }
2165 if (*p == '%') {
2166 if(*(p + 1) == 'p') {
2167 p += 2;
2168 count_p ++;
2169 continue;
2170 }
2171 if (*(p + 1) == 't') {
2172 p += 2;
2173 count_t ++;
2174 continue;
2175 }
2176 }
2177 return false;
2178 }
2179 return count_p < 2 && count_t < 2;
2180 }
2182 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2183 if (!is_percentage(min_heap_free_ratio)) {
2184 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2185 return false;
2186 }
2187 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2188 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2189 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2190 MaxHeapFreeRatio);
2191 return false;
2192 }
2193 // This does not set the flag itself, but stores the value in a safe place for later usage.
2194 _min_heap_free_ratio = min_heap_free_ratio;
2195 return true;
2196 }
2198 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2199 if (!is_percentage(max_heap_free_ratio)) {
2200 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2201 return false;
2202 }
2203 if (max_heap_free_ratio < MinHeapFreeRatio) {
2204 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2205 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2206 MinHeapFreeRatio);
2207 return false;
2208 }
2209 // This does not set the flag itself, but stores the value in a safe place for later usage.
2210 _max_heap_free_ratio = max_heap_free_ratio;
2211 return true;
2212 }
2214 // Check consistency of GC selection
2215 bool Arguments::check_gc_consistency() {
2216 check_gclog_consistency();
2217 bool status = true;
2218 // Ensure that the user has not selected conflicting sets
2219 // of collectors. [Note: this check is merely a user convenience;
2220 // collectors over-ride each other so that only a non-conflicting
2221 // set is selected; however what the user gets is not what they
2222 // may have expected from the combination they asked for. It's
2223 // better to reduce user confusion by not allowing them to
2224 // select conflicting combinations.
2225 uint i = 0;
2226 if (UseSerialGC) i++;
2227 if (UseConcMarkSweepGC || UseParNewGC) i++;
2228 if (UseParallelGC || UseParallelOldGC) i++;
2229 if (UseG1GC) i++;
2230 if (i > 1) {
2231 jio_fprintf(defaultStream::error_stream(),
2232 "Conflicting collector combinations in option list; "
2233 "please refer to the release notes for the combinations "
2234 "allowed\n");
2235 status = false;
2236 }
2237 return status;
2238 }
2240 void Arguments::check_deprecated_gcs() {
2241 if (UseConcMarkSweepGC && !UseParNewGC) {
2242 warning("Using the DefNew young collector with the CMS collector is deprecated "
2243 "and will likely be removed in a future release");
2244 }
2246 if (UseParNewGC && !UseConcMarkSweepGC) {
2247 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2248 // set up UseSerialGC properly, so that can't be used in the check here.
2249 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2250 "and will likely be removed in a future release");
2251 }
2253 if (CMSIncrementalMode) {
2254 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2255 }
2256 }
2258 void Arguments::check_deprecated_gc_flags() {
2259 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2260 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2261 "and will likely be removed in future release");
2262 }
2263 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2264 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2265 "Use MaxRAMFraction instead.");
2266 }
2267 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2268 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2269 }
2270 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2271 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2272 }
2273 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2274 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2275 }
2276 }
2278 // Check stack pages settings
2279 bool Arguments::check_stack_pages()
2280 {
2281 bool status = true;
2282 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2283 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2284 // greater stack shadow pages can't generate instruction to bang stack
2285 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2286 return status;
2287 }
2289 // Check the consistency of vm_init_args
2290 bool Arguments::check_vm_args_consistency() {
2291 // Method for adding checks for flag consistency.
2292 // The intent is to warn the user of all possible conflicts,
2293 // before returning an error.
2294 // Note: Needs platform-dependent factoring.
2295 bool status = true;
2297 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2298 // builds so the cost of stack banging can be measured.
2299 #if (defined(PRODUCT) && defined(SOLARIS))
2300 if (!UseBoundThreads && !UseStackBanging) {
2301 jio_fprintf(defaultStream::error_stream(),
2302 "-UseStackBanging conflicts with -UseBoundThreads\n");
2304 status = false;
2305 }
2306 #endif
2308 if (TLABRefillWasteFraction == 0) {
2309 jio_fprintf(defaultStream::error_stream(),
2310 "TLABRefillWasteFraction should be a denominator, "
2311 "not " SIZE_FORMAT "\n",
2312 TLABRefillWasteFraction);
2313 status = false;
2314 }
2316 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2317 "AdaptiveSizePolicyWeight");
2318 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2320 // Divide by bucket size to prevent a large size from causing rollover when
2321 // calculating amount of memory needed to be allocated for the String table.
2322 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2323 (max_uintx / StringTable::bucket_size()), "StringTable size");
2325 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2326 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2328 {
2329 // Using "else if" below to avoid printing two error messages if min > max.
2330 // This will also prevent us from reporting both min>100 and max>100 at the
2331 // same time, but that is less annoying than printing two identical errors IMHO.
2332 FormatBuffer<80> err_msg("%s","");
2333 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2334 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2335 status = false;
2336 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2337 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2338 status = false;
2339 }
2340 }
2342 // Min/MaxMetaspaceFreeRatio
2343 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2344 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2346 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2347 jio_fprintf(defaultStream::error_stream(),
2348 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2349 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2350 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2351 MinMetaspaceFreeRatio,
2352 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2353 MaxMetaspaceFreeRatio);
2354 status = false;
2355 }
2357 // Trying to keep 100% free is not practical
2358 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2360 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2361 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2362 }
2364 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2365 // Settings to encourage splitting.
2366 if (!FLAG_IS_CMDLINE(NewRatio)) {
2367 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2368 }
2369 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2370 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2371 }
2372 }
2374 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2375 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2376 if (GCTimeLimit == 100) {
2377 // Turn off gc-overhead-limit-exceeded checks
2378 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2379 }
2381 status = status && check_gc_consistency();
2382 status = status && check_stack_pages();
2384 if (CMSIncrementalMode) {
2385 if (!UseConcMarkSweepGC) {
2386 jio_fprintf(defaultStream::error_stream(),
2387 "error: invalid argument combination.\n"
2388 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2389 "selected in order\nto use CMSIncrementalMode.\n");
2390 status = false;
2391 } else {
2392 status = status && verify_percentage(CMSIncrementalDutyCycle,
2393 "CMSIncrementalDutyCycle");
2394 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2395 "CMSIncrementalDutyCycleMin");
2396 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2397 "CMSIncrementalSafetyFactor");
2398 status = status && verify_percentage(CMSIncrementalOffset,
2399 "CMSIncrementalOffset");
2400 status = status && verify_percentage(CMSExpAvgFactor,
2401 "CMSExpAvgFactor");
2402 // If it was not set on the command line, set
2403 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2404 if (CMSInitiatingOccupancyFraction < 0) {
2405 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2406 }
2407 }
2408 }
2410 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2411 // insists that we hold the requisite locks so that the iteration is
2412 // MT-safe. For the verification at start-up and shut-down, we don't
2413 // yet have a good way of acquiring and releasing these locks,
2414 // which are not visible at the CollectedHeap level. We want to
2415 // be able to acquire these locks and then do the iteration rather
2416 // than just disable the lock verification. This will be fixed under
2417 // bug 4788986.
2418 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2419 if (VerifyDuringStartup) {
2420 warning("Heap verification at start-up disabled "
2421 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2422 VerifyDuringStartup = false; // Disable verification at start-up
2423 }
2425 if (VerifyBeforeExit) {
2426 warning("Heap verification at shutdown disabled "
2427 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2428 VerifyBeforeExit = false; // Disable verification at shutdown
2429 }
2430 }
2432 // Note: only executed in non-PRODUCT mode
2433 if (!UseAsyncConcMarkSweepGC &&
2434 (ExplicitGCInvokesConcurrent ||
2435 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2438 " with -UseAsyncConcMarkSweepGC");
2439 status = false;
2440 }
2442 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2444 #if INCLUDE_ALL_GCS
2445 if (UseG1GC) {
2446 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2447 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2448 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2450 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2451 "InitiatingHeapOccupancyPercent");
2452 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2453 "G1RefProcDrainInterval");
2454 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2455 "G1ConcMarkStepDurationMillis");
2456 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2457 "G1ConcRSHotCardLimit");
2458 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2459 "G1ConcRSLogCacheSize");
2460 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2461 "StringDeduplicationAgeThreshold");
2462 }
2463 if (UseConcMarkSweepGC) {
2464 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2465 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2466 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2467 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2469 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2471 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2472 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2473 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2475 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2477 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2478 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2480 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2481 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2482 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2484 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2486 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2488 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2489 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2490 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2491 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2492 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2493 }
2495 if (UseParallelGC || UseParallelOldGC) {
2496 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2497 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2499 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2500 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2502 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2503 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2505 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2507 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2508 }
2509 #endif // INCLUDE_ALL_GCS
2511 status = status && verify_interval(RefDiscoveryPolicy,
2512 ReferenceProcessor::DiscoveryPolicyMin,
2513 ReferenceProcessor::DiscoveryPolicyMax,
2514 "RefDiscoveryPolicy");
2516 // Limit the lower bound of this flag to 1 as it is used in a division
2517 // expression.
2518 status = status && verify_interval(TLABWasteTargetPercent,
2519 1, 100, "TLABWasteTargetPercent");
2521 status = status && verify_object_alignment();
2523 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2524 "CompressedClassSpaceSize");
2526 status = status && verify_interval(MarkStackSizeMax,
2527 1, (max_jint - 1), "MarkStackSizeMax");
2528 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2530 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2532 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2534 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2536 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2537 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2539 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2541 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2542 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2543 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2544 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2546 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2547 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2549 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2550 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2551 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2553 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2554 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2556 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2557 // just for that, so hardcode here.
2558 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2559 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2560 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2561 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2563 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2564 #ifdef COMPILER1
2565 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2566 #endif
2568 if (PrintNMTStatistics) {
2569 #if INCLUDE_NMT
2570 if (MemTracker::tracking_level() == NMT_off) {
2571 #endif // INCLUDE_NMT
2572 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2573 PrintNMTStatistics = false;
2574 #if INCLUDE_NMT
2575 }
2576 #endif
2577 }
2579 // Need to limit the extent of the padding to reasonable size.
2580 // 8K is well beyond the reasonable HW cache line size, even with the
2581 // aggressive prefetching, while still leaving the room for segregating
2582 // among the distinct pages.
2583 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2584 jio_fprintf(defaultStream::error_stream(),
2585 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2586 ContendedPaddingWidth, 0, 8192);
2587 status = false;
2588 }
2590 // Need to enforce the padding not to break the existing field alignments.
2591 // It is sufficient to check against the largest type size.
2592 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2593 jio_fprintf(defaultStream::error_stream(),
2594 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2595 ContendedPaddingWidth, BytesPerLong);
2596 status = false;
2597 }
2599 // Check lower bounds of the code cache
2600 // Template Interpreter code is approximately 3X larger in debug builds.
2601 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2602 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2605 os::vm_page_size()/K);
2606 status = false;
2607 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2608 jio_fprintf(defaultStream::error_stream(),
2609 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2610 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2611 status = false;
2612 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2615 min_code_cache_size/K);
2616 status = false;
2617 } else if (ReservedCodeCacheSize > 2*G) {
2618 // Code cache size larger than MAXINT is not supported.
2619 jio_fprintf(defaultStream::error_stream(),
2620 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2621 (2*G)/M);
2622 status = false;
2623 }
2625 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2626 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2628 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2629 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2630 }
2632 #ifdef COMPILER1
2633 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2634 #endif
2636 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2637 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2638 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2639 // Check the minimum number of compiler threads
2640 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2642 return status;
2643 }
2645 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2646 const char* option_type) {
2647 if (ignore) return false;
2649 const char* spacer = " ";
2650 if (option_type == NULL) {
2651 option_type = ++spacer; // Set both to the empty string.
2652 }
2654 if (os::obsolete_option(option)) {
2655 jio_fprintf(defaultStream::error_stream(),
2656 "Obsolete %s%soption: %s\n", option_type, spacer,
2657 option->optionString);
2658 return false;
2659 } else {
2660 jio_fprintf(defaultStream::error_stream(),
2661 "Unrecognized %s%soption: %s\n", option_type, spacer,
2662 option->optionString);
2663 return true;
2664 }
2665 }
2667 static const char* user_assertion_options[] = {
2668 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2669 };
2671 static const char* system_assertion_options[] = {
2672 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2673 };
2675 // Return true if any of the strings in null-terminated array 'names' matches.
2676 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2677 // the option must match exactly.
2678 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2679 bool tail_allowed) {
2680 for (/* empty */; *names != NULL; ++names) {
2681 if (match_option(option, *names, tail)) {
2682 if (**tail == '\0' || tail_allowed && **tail == ':') {
2683 return true;
2684 }
2685 }
2686 }
2687 return false;
2688 }
2690 bool Arguments::parse_uintx(const char* value,
2691 uintx* uintx_arg,
2692 uintx min_size) {
2694 // Check the sign first since atomull() parses only unsigned values.
2695 bool value_is_positive = !(*value == '-');
2697 if (value_is_positive) {
2698 julong n;
2699 bool good_return = atomull(value, &n);
2700 if (good_return) {
2701 bool above_minimum = n >= min_size;
2702 bool value_is_too_large = n > max_uintx;
2704 if (above_minimum && !value_is_too_large) {
2705 *uintx_arg = n;
2706 return true;
2707 }
2708 }
2709 }
2710 return false;
2711 }
2713 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2714 julong* long_arg,
2715 julong min_size) {
2716 if (!atomull(s, long_arg)) return arg_unreadable;
2717 return check_memory_size(*long_arg, min_size);
2718 }
2720 // Parse JavaVMInitArgs structure
2722 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2723 // For components of the system classpath.
2724 SysClassPath scp(Arguments::get_sysclasspath());
2725 bool scp_assembly_required = false;
2727 // Save default settings for some mode flags
2728 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2729 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2730 Arguments::_ClipInlining = ClipInlining;
2731 Arguments::_BackgroundCompilation = BackgroundCompilation;
2733 // Setup flags for mixed which is the default
2734 set_mode_flags(_mixed);
2736 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2737 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2738 if (result != JNI_OK) {
2739 return result;
2740 }
2742 // Parse JavaVMInitArgs structure passed in
2743 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2744 if (result != JNI_OK) {
2745 return result;
2746 }
2748 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2749 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2750 if (result != JNI_OK) {
2751 return result;
2752 }
2754 // We need to ensure processor and memory resources have been properly
2755 // configured - which may rely on arguments we just processed - before
2756 // doing the final argument processing. Any argument processing that
2757 // needs to know about processor and memory resources must occur after
2758 // this point.
2760 os::init_container_support();
2762 // Do final processing now that all arguments have been parsed
2763 result = finalize_vm_init_args(&scp, scp_assembly_required);
2764 if (result != JNI_OK) {
2765 return result;
2766 }
2768 return JNI_OK;
2769 }
2771 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2772 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2773 // are dealing with -agentpath (case where name is a path), otherwise with
2774 // -agentlib
2775 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2776 char *_name;
2777 const char *_hprof = "hprof", *_jdwp = "jdwp";
2778 size_t _len_hprof, _len_jdwp, _len_prefix;
2780 if (is_path) {
2781 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2782 return false;
2783 }
2785 _name++; // skip past last path separator
2786 _len_prefix = strlen(JNI_LIB_PREFIX);
2788 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2789 return false;
2790 }
2792 _name += _len_prefix;
2793 _len_hprof = strlen(_hprof);
2794 _len_jdwp = strlen(_jdwp);
2796 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2797 _name += _len_hprof;
2798 }
2799 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2800 _name += _len_jdwp;
2801 }
2802 else {
2803 return false;
2804 }
2806 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2807 return false;
2808 }
2810 return true;
2811 }
2813 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2814 return true;
2815 }
2817 return false;
2818 }
2820 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2821 SysClassPath* scp_p,
2822 bool* scp_assembly_required_p,
2823 Flag::Flags origin) {
2824 // Remaining part of option string
2825 const char* tail;
2827 // iterate over arguments
2828 for (int index = 0; index < args->nOptions; index++) {
2829 bool is_absolute_path = false; // for -agentpath vs -agentlib
2831 const JavaVMOption* option = args->options + index;
2833 if (!match_option(option, "-Djava.class.path", &tail) &&
2834 !match_option(option, "-Dsun.java.command", &tail) &&
2835 !match_option(option, "-Dsun.java.launcher", &tail)) {
2837 // add all jvm options to the jvm_args string. This string
2838 // is used later to set the java.vm.args PerfData string constant.
2839 // the -Djava.class.path and the -Dsun.java.command options are
2840 // omitted from jvm_args string as each have their own PerfData
2841 // string constant object.
2842 build_jvm_args(option->optionString);
2843 }
2845 // -verbose:[class/gc/jni]
2846 if (match_option(option, "-verbose", &tail)) {
2847 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2848 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2849 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2850 } else if (!strcmp(tail, ":gc")) {
2851 FLAG_SET_CMDLINE(bool, PrintGC, true);
2852 } else if (!strcmp(tail, ":jni")) {
2853 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2854 }
2855 // -da / -ea / -disableassertions / -enableassertions
2856 // These accept an optional class/package name separated by a colon, e.g.,
2857 // -da:java.lang.Thread.
2858 } else if (match_option(option, user_assertion_options, &tail, true)) {
2859 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2860 if (*tail == '\0') {
2861 JavaAssertions::setUserClassDefault(enable);
2862 } else {
2863 assert(*tail == ':', "bogus match by match_option()");
2864 JavaAssertions::addOption(tail + 1, enable);
2865 }
2866 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2867 } else if (match_option(option, system_assertion_options, &tail, false)) {
2868 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2869 JavaAssertions::setSystemClassDefault(enable);
2870 // -bootclasspath:
2871 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2872 scp_p->reset_path(tail);
2873 *scp_assembly_required_p = true;
2874 // -bootclasspath/a:
2875 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2876 scp_p->add_suffix(tail);
2877 *scp_assembly_required_p = true;
2878 // -bootclasspath/p:
2879 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2880 scp_p->add_prefix(tail);
2881 *scp_assembly_required_p = true;
2882 // -Xrun
2883 } else if (match_option(option, "-Xrun", &tail)) {
2884 if (tail != NULL) {
2885 const char* pos = strchr(tail, ':');
2886 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2887 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2888 name[len] = '\0';
2890 char *options = NULL;
2891 if(pos != NULL) {
2892 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2893 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2894 }
2895 #if !INCLUDE_JVMTI
2896 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2897 jio_fprintf(defaultStream::error_stream(),
2898 "Profiling and debugging agents are not supported in this VM\n");
2899 return JNI_ERR;
2900 }
2901 #endif // !INCLUDE_JVMTI
2902 add_init_library(name, options);
2903 }
2904 // -agentlib and -agentpath
2905 } else if (match_option(option, "-agentlib:", &tail) ||
2906 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2907 if(tail != NULL) {
2908 const char* pos = strchr(tail, '=');
2909 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2910 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2911 name[len] = '\0';
2913 char *options = NULL;
2914 if(pos != NULL) {
2915 size_t length = strlen(pos + 1) + 1;
2916 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2917 jio_snprintf(options, length, "%s", pos + 1);
2918 }
2919 #if !INCLUDE_JVMTI
2920 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2921 jio_fprintf(defaultStream::error_stream(),
2922 "Profiling and debugging agents are not supported in this VM\n");
2923 return JNI_ERR;
2924 }
2925 #endif // !INCLUDE_JVMTI
2926 add_init_agent(name, options, is_absolute_path);
2927 }
2928 // -javaagent
2929 } else if (match_option(option, "-javaagent:", &tail)) {
2930 #if !INCLUDE_JVMTI
2931 jio_fprintf(defaultStream::error_stream(),
2932 "Instrumentation agents are not supported in this VM\n");
2933 return JNI_ERR;
2934 #else
2935 if(tail != NULL) {
2936 size_t length = strlen(tail) + 1;
2937 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2938 jio_snprintf(options, length, "%s", tail);
2939 add_init_agent("instrument", options, false);
2940 }
2941 #endif // !INCLUDE_JVMTI
2942 // -Xnoclassgc
2943 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2944 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2945 // -Xincgc: i-CMS
2946 } else if (match_option(option, "-Xincgc", &tail)) {
2947 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2948 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2949 // -Xnoincgc: no i-CMS
2950 } else if (match_option(option, "-Xnoincgc", &tail)) {
2951 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2952 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2953 // -Xconcgc
2954 } else if (match_option(option, "-Xconcgc", &tail)) {
2955 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2956 // -Xnoconcgc
2957 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2958 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2959 // -Xbatch
2960 } else if (match_option(option, "-Xbatch", &tail)) {
2961 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2962 // -Xmn for compatibility with other JVM vendors
2963 } else if (match_option(option, "-Xmn", &tail)) {
2964 julong long_initial_young_size = 0;
2965 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2966 if (errcode != arg_in_range) {
2967 jio_fprintf(defaultStream::error_stream(),
2968 "Invalid initial young generation size: %s\n", option->optionString);
2969 describe_range_error(errcode);
2970 return JNI_EINVAL;
2971 }
2972 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2973 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2974 // -Xms
2975 } else if (match_option(option, "-Xms", &tail)) {
2976 julong long_initial_heap_size = 0;
2977 // an initial heap size of 0 means automatically determine
2978 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2979 if (errcode != arg_in_range) {
2980 jio_fprintf(defaultStream::error_stream(),
2981 "Invalid initial heap size: %s\n", option->optionString);
2982 describe_range_error(errcode);
2983 return JNI_EINVAL;
2984 }
2985 set_min_heap_size((uintx)long_initial_heap_size);
2986 // Currently the minimum size and the initial heap sizes are the same.
2987 // Can be overridden with -XX:InitialHeapSize.
2988 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2989 // -Xmx
2990 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2991 julong long_max_heap_size = 0;
2992 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2993 if (errcode != arg_in_range) {
2994 jio_fprintf(defaultStream::error_stream(),
2995 "Invalid maximum heap size: %s\n", option->optionString);
2996 describe_range_error(errcode);
2997 return JNI_EINVAL;
2998 }
2999 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3000 // Xmaxf
3001 } else if (match_option(option, "-Xmaxf", &tail)) {
3002 char* err;
3003 int maxf = (int)(strtod(tail, &err) * 100);
3004 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3005 jio_fprintf(defaultStream::error_stream(),
3006 "Bad max heap free percentage size: %s\n",
3007 option->optionString);
3008 return JNI_EINVAL;
3009 } else {
3010 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3011 }
3012 // Xminf
3013 } else if (match_option(option, "-Xminf", &tail)) {
3014 char* err;
3015 int minf = (int)(strtod(tail, &err) * 100);
3016 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3017 jio_fprintf(defaultStream::error_stream(),
3018 "Bad min heap free percentage size: %s\n",
3019 option->optionString);
3020 return JNI_EINVAL;
3021 } else {
3022 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3023 }
3024 // -Xss
3025 } else if (match_option(option, "-Xss", &tail)) {
3026 julong long_ThreadStackSize = 0;
3027 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3028 if (errcode != arg_in_range) {
3029 jio_fprintf(defaultStream::error_stream(),
3030 "Invalid thread stack size: %s\n", option->optionString);
3031 describe_range_error(errcode);
3032 return JNI_EINVAL;
3033 }
3034 // Internally track ThreadStackSize in units of 1024 bytes.
3035 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3036 round_to((int)long_ThreadStackSize, K) / K);
3037 // -Xoss
3038 } else if (match_option(option, "-Xoss", &tail)) {
3039 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3040 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3041 julong long_CodeCacheExpansionSize = 0;
3042 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3043 if (errcode != arg_in_range) {
3044 jio_fprintf(defaultStream::error_stream(),
3045 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3046 os::vm_page_size()/K);
3047 return JNI_EINVAL;
3048 }
3049 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3050 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3051 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3052 julong long_ReservedCodeCacheSize = 0;
3054 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3055 if (errcode != arg_in_range) {
3056 jio_fprintf(defaultStream::error_stream(),
3057 "Invalid maximum code cache size: %s.\n", option->optionString);
3058 return JNI_EINVAL;
3059 }
3060 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3061 //-XX:IncreaseFirstTierCompileThresholdAt=
3062 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3063 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3064 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3065 jio_fprintf(defaultStream::error_stream(),
3066 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3067 option->optionString);
3068 return JNI_EINVAL;
3069 }
3070 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3071 // -green
3072 } else if (match_option(option, "-green", &tail)) {
3073 jio_fprintf(defaultStream::error_stream(),
3074 "Green threads support not available\n");
3075 return JNI_EINVAL;
3076 // -native
3077 } else if (match_option(option, "-native", &tail)) {
3078 // HotSpot always uses native threads, ignore silently for compatibility
3079 // -Xsqnopause
3080 } else if (match_option(option, "-Xsqnopause", &tail)) {
3081 // EVM option, ignore silently for compatibility
3082 // -Xrs
3083 } else if (match_option(option, "-Xrs", &tail)) {
3084 // Classic/EVM option, new functionality
3085 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3086 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3087 // change default internal VM signals used - lower case for back compat
3088 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3089 // -Xoptimize
3090 } else if (match_option(option, "-Xoptimize", &tail)) {
3091 // EVM option, ignore silently for compatibility
3092 // -Xprof
3093 } else if (match_option(option, "-Xprof", &tail)) {
3094 #if INCLUDE_FPROF
3095 _has_profile = true;
3096 #else // INCLUDE_FPROF
3097 jio_fprintf(defaultStream::error_stream(),
3098 "Flat profiling is not supported in this VM.\n");
3099 return JNI_ERR;
3100 #endif // INCLUDE_FPROF
3101 // -Xconcurrentio
3102 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3103 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3104 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3105 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3106 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3107 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3109 // -Xinternalversion
3110 } else if (match_option(option, "-Xinternalversion", &tail)) {
3111 jio_fprintf(defaultStream::output_stream(), "%s\n",
3112 VM_Version::internal_vm_info_string());
3113 vm_exit(0);
3114 #ifndef PRODUCT
3115 // -Xprintflags
3116 } else if (match_option(option, "-Xprintflags", &tail)) {
3117 CommandLineFlags::printFlags(tty, false);
3118 vm_exit(0);
3119 #endif
3120 // -D
3121 } else if (match_option(option, "-D", &tail)) {
3122 if (CheckEndorsedAndExtDirs) {
3123 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3124 // abort if -Djava.endorsed.dirs is set
3125 jio_fprintf(defaultStream::output_stream(),
3126 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3127 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3128 return JNI_EINVAL;
3129 }
3130 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3131 // abort if -Djava.ext.dirs is set
3132 jio_fprintf(defaultStream::output_stream(),
3133 "-Djava.ext.dirs will not be supported in a future release.\n"
3134 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3135 return JNI_EINVAL;
3136 }
3137 }
3139 if (!add_property(tail)) {
3140 return JNI_ENOMEM;
3141 }
3142 // Out of the box management support
3143 if (match_option(option, "-Dcom.sun.management", &tail)) {
3144 #if INCLUDE_MANAGEMENT
3145 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3146 #else
3147 jio_fprintf(defaultStream::output_stream(),
3148 "-Dcom.sun.management is not supported in this VM.\n");
3149 return JNI_ERR;
3150 #endif
3151 }
3152 // -Xint
3153 } else if (match_option(option, "-Xint", &tail)) {
3154 set_mode_flags(_int);
3155 // -Xmixed
3156 } else if (match_option(option, "-Xmixed", &tail)) {
3157 set_mode_flags(_mixed);
3158 // -Xcomp
3159 } else if (match_option(option, "-Xcomp", &tail)) {
3160 // for testing the compiler; turn off all flags that inhibit compilation
3161 set_mode_flags(_comp);
3162 // -Xshare:dump
3163 } else if (match_option(option, "-Xshare:dump", &tail)) {
3164 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3165 set_mode_flags(_int); // Prevent compilation, which creates objects
3166 // -Xshare:on
3167 } else if (match_option(option, "-Xshare:on", &tail)) {
3168 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3169 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3170 // -Xshare:auto
3171 } else if (match_option(option, "-Xshare:auto", &tail)) {
3172 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3173 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3174 // -Xshare:off
3175 } else if (match_option(option, "-Xshare:off", &tail)) {
3176 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3177 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3178 // -Xverify
3179 } else if (match_option(option, "-Xverify", &tail)) {
3180 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3181 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3182 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3183 } else if (strcmp(tail, ":remote") == 0) {
3184 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3185 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3186 } else if (strcmp(tail, ":none") == 0) {
3187 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3188 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3189 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3190 return JNI_EINVAL;
3191 }
3192 // -Xdebug
3193 } else if (match_option(option, "-Xdebug", &tail)) {
3194 // note this flag has been used, then ignore
3195 set_xdebug_mode(true);
3196 // -Xnoagent
3197 } else if (match_option(option, "-Xnoagent", &tail)) {
3198 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3199 } else if (match_option(option, "-Xboundthreads", &tail)) {
3200 // Bind user level threads to kernel threads (Solaris only)
3201 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3202 } else if (match_option(option, "-Xloggc:", &tail)) {
3203 // Redirect GC output to the file. -Xloggc:<filename>
3204 // ostream_init_log(), when called will use this filename
3205 // to initialize a fileStream.
3206 _gc_log_filename = strdup(tail);
3207 if (!is_filename_valid(_gc_log_filename)) {
3208 jio_fprintf(defaultStream::output_stream(),
3209 "Invalid file name for use with -Xloggc: Filename can only contain the "
3210 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3211 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3212 return JNI_EINVAL;
3213 }
3214 FLAG_SET_CMDLINE(bool, PrintGC, true);
3215 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3217 // JNI hooks
3218 } else if (match_option(option, "-Xcheck", &tail)) {
3219 if (!strcmp(tail, ":jni")) {
3220 #if !INCLUDE_JNI_CHECK
3221 warning("JNI CHECKING is not supported in this VM");
3222 #else
3223 CheckJNICalls = true;
3224 #endif // INCLUDE_JNI_CHECK
3225 } else if (is_bad_option(option, args->ignoreUnrecognized,
3226 "check")) {
3227 return JNI_EINVAL;
3228 }
3229 } else if (match_option(option, "vfprintf", &tail)) {
3230 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3231 } else if (match_option(option, "exit", &tail)) {
3232 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3233 } else if (match_option(option, "abort", &tail)) {
3234 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3235 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3236 // The last option must always win.
3237 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3238 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3239 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3240 // The last option must always win.
3241 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3242 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3243 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3244 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3245 jio_fprintf(defaultStream::error_stream(),
3246 "Please use CMSClassUnloadingEnabled in place of "
3247 "CMSPermGenSweepingEnabled in the future\n");
3248 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3249 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3250 jio_fprintf(defaultStream::error_stream(),
3251 "Please use -XX:+UseGCOverheadLimit in place of "
3252 "-XX:+UseGCTimeLimit in the future\n");
3253 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3254 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3255 jio_fprintf(defaultStream::error_stream(),
3256 "Please use -XX:-UseGCOverheadLimit in place of "
3257 "-XX:-UseGCTimeLimit in the future\n");
3258 // The TLE options are for compatibility with 1.3 and will be
3259 // removed without notice in a future release. These options
3260 // are not to be documented.
3261 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3262 // No longer used.
3263 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3264 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3265 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3266 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3267 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3268 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3269 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3270 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3271 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3272 // No longer used.
3273 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3274 julong long_tlab_size = 0;
3275 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3276 if (errcode != arg_in_range) {
3277 jio_fprintf(defaultStream::error_stream(),
3278 "Invalid TLAB size: %s\n", option->optionString);
3279 describe_range_error(errcode);
3280 return JNI_EINVAL;
3281 }
3282 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3283 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3284 // No longer used.
3285 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3286 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3287 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3288 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3289 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3290 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3291 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3292 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3293 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3294 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3295 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3296 #if defined(DTRACE_ENABLED)
3297 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3298 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3299 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3300 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3301 #else // defined(DTRACE_ENABLED)
3302 jio_fprintf(defaultStream::error_stream(),
3303 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3304 return JNI_EINVAL;
3305 #endif // defined(DTRACE_ENABLED)
3306 #ifdef ASSERT
3307 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3308 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3309 // disable scavenge before parallel mark-compact
3310 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3311 #endif
3312 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3313 julong cms_blocks_to_claim = (julong)atol(tail);
3314 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3315 jio_fprintf(defaultStream::error_stream(),
3316 "Please use -XX:OldPLABSize in place of "
3317 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3318 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3319 julong cms_blocks_to_claim = (julong)atol(tail);
3320 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3321 jio_fprintf(defaultStream::error_stream(),
3322 "Please use -XX:OldPLABSize in place of "
3323 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3324 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3325 julong old_plab_size = 0;
3326 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3327 if (errcode != arg_in_range) {
3328 jio_fprintf(defaultStream::error_stream(),
3329 "Invalid old PLAB size: %s\n", option->optionString);
3330 describe_range_error(errcode);
3331 return JNI_EINVAL;
3332 }
3333 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3334 jio_fprintf(defaultStream::error_stream(),
3335 "Please use -XX:OldPLABSize in place of "
3336 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3337 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3338 julong young_plab_size = 0;
3339 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3340 if (errcode != arg_in_range) {
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Invalid young PLAB size: %s\n", option->optionString);
3343 describe_range_error(errcode);
3344 return JNI_EINVAL;
3345 }
3346 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3347 jio_fprintf(defaultStream::error_stream(),
3348 "Please use -XX:YoungPLABSize in place of "
3349 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3350 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3351 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3352 julong stack_size = 0;
3353 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3354 if (errcode != arg_in_range) {
3355 jio_fprintf(defaultStream::error_stream(),
3356 "Invalid mark stack size: %s\n", option->optionString);
3357 describe_range_error(errcode);
3358 return JNI_EINVAL;
3359 }
3360 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3361 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3362 julong max_stack_size = 0;
3363 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3364 if (errcode != arg_in_range) {
3365 jio_fprintf(defaultStream::error_stream(),
3366 "Invalid maximum mark stack size: %s\n",
3367 option->optionString);
3368 describe_range_error(errcode);
3369 return JNI_EINVAL;
3370 }
3371 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3372 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3373 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3374 uintx conc_threads = 0;
3375 if (!parse_uintx(tail, &conc_threads, 1)) {
3376 jio_fprintf(defaultStream::error_stream(),
3377 "Invalid concurrent threads: %s\n", option->optionString);
3378 return JNI_EINVAL;
3379 }
3380 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3381 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3382 julong max_direct_memory_size = 0;
3383 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3384 if (errcode != arg_in_range) {
3385 jio_fprintf(defaultStream::error_stream(),
3386 "Invalid maximum direct memory size: %s\n",
3387 option->optionString);
3388 describe_range_error(errcode);
3389 return JNI_EINVAL;
3390 }
3391 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3392 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3393 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3394 // away and will cause VM initialization failures!
3395 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3396 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3397 #if !INCLUDE_MANAGEMENT
3398 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3399 jio_fprintf(defaultStream::error_stream(),
3400 "ManagementServer is not supported in this VM.\n");
3401 return JNI_ERR;
3402 #endif // INCLUDE_MANAGEMENT
3403 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3404 // Skip -XX:Flags= since that case has already been handled
3405 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3406 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3407 return JNI_EINVAL;
3408 }
3409 }
3410 // Unknown option
3411 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3412 return JNI_ERR;
3413 }
3414 }
3416 // PrintSharedArchiveAndExit will turn on
3417 // -Xshare:on
3418 // -XX:+TraceClassPaths
3419 if (PrintSharedArchiveAndExit) {
3420 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3421 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3422 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3423 }
3425 // Change the default value for flags which have different default values
3426 // when working with older JDKs.
3427 #ifdef LINUX
3428 if (JDK_Version::current().compare_major(6) <= 0 &&
3429 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3430 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3431 }
3432 #endif // LINUX
3433 fix_appclasspath();
3434 return JNI_OK;
3435 }
3437 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3438 //
3439 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3440 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3441 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3442 // path is treated as the current directory.
3443 //
3444 // This causes problems with CDS, which requires that all directories specified in the classpath
3445 // must be empty. In most cases, applications do NOT want to load classes from the current
3446 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3447 // scripts compatible with CDS.
3448 void Arguments::fix_appclasspath() {
3449 if (IgnoreEmptyClassPaths) {
3450 const char separator = *os::path_separator();
3451 const char* src = _java_class_path->value();
3453 // skip over all the leading empty paths
3454 while (*src == separator) {
3455 src ++;
3456 }
3458 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3459 strncpy(copy, src, strlen(src) + 1);
3461 // trim all trailing empty paths
3462 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3463 *tail = '\0';
3464 }
3466 char from[3] = {separator, separator, '\0'};
3467 char to [2] = {separator, '\0'};
3468 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3469 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3470 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3471 }
3473 _java_class_path->set_value(copy);
3474 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3475 }
3477 if (!PrintSharedArchiveAndExit) {
3478 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3479 }
3480 }
3482 static bool has_jar_files(const char* directory) {
3483 DIR* dir = os::opendir(directory);
3484 if (dir == NULL) return false;
3486 struct dirent *entry;
3487 bool hasJarFile = false;
3488 while (!hasJarFile && (entry = os::readdir(dir)) != NULL) {
3489 const char* name = entry->d_name;
3490 const char* ext = name + strlen(name) - 4;
3491 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3492 }
3493 os::closedir(dir);
3494 return hasJarFile ;
3495 }
3497 // returns the number of directories in the given path containing JAR files
3498 // If the skip argument is not NULL, it will skip that directory
3499 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3500 const char separator = *os::path_separator();
3501 const char* const end = path + strlen(path);
3502 int nonEmptyDirs = 0;
3503 while (path < end) {
3504 const char* tmp_end = strchr(path, separator);
3505 if (tmp_end == NULL) {
3506 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3507 nonEmptyDirs++;
3508 jio_fprintf(defaultStream::output_stream(),
3509 "Non-empty %s directory: %s\n", type, path);
3510 }
3511 path = end;
3512 } else {
3513 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3514 memcpy(dirpath, path, tmp_end - path);
3515 dirpath[tmp_end - path] = '\0';
3516 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3517 nonEmptyDirs++;
3518 jio_fprintf(defaultStream::output_stream(),
3519 "Non-empty %s directory: %s\n", type, dirpath);
3520 }
3521 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3522 path = tmp_end + 1;
3523 }
3524 }
3525 return nonEmptyDirs;
3526 }
3528 // Returns true if endorsed standards override mechanism and extension mechanism
3529 // are not used.
3530 static bool check_endorsed_and_ext_dirs() {
3531 if (!CheckEndorsedAndExtDirs)
3532 return true;
3534 char endorsedDir[JVM_MAXPATHLEN];
3535 char extDir[JVM_MAXPATHLEN];
3536 const char* fileSep = os::file_separator();
3537 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3538 Arguments::get_java_home(), fileSep, fileSep);
3539 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3540 Arguments::get_java_home(), fileSep, fileSep);
3542 // check endorsed directory
3543 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3545 // check the extension directories but skip the default lib/ext directory
3546 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3548 // List of JAR files installed in the default lib/ext directory.
3549 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3550 static const char* jdk_ext_jars[] = {
3551 "access-bridge-32.jar",
3552 "access-bridge-64.jar",
3553 "access-bridge.jar",
3554 "cldrdata.jar",
3555 "dnsns.jar",
3556 "jaccess.jar",
3557 "jfxrt.jar",
3558 "localedata.jar",
3559 "nashorn.jar",
3560 "sunec.jar",
3561 "sunjce_provider.jar",
3562 "sunmscapi.jar",
3563 "sunpkcs11.jar",
3564 "ucrypto.jar",
3565 "zipfs.jar",
3566 NULL
3567 };
3569 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3570 DIR* dir = os::opendir(extDir);
3571 if (dir != NULL) {
3572 int num_ext_jars = 0;
3573 struct dirent *entry;
3574 while ((entry = os::readdir(dir)) != NULL) {
3575 const char* name = entry->d_name;
3576 const char* ext = name + strlen(name) - 4;
3577 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3578 bool is_jdk_jar = false;
3579 const char* jarfile = NULL;
3580 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3581 if (os::file_name_strcmp(name, jarfile) == 0) {
3582 is_jdk_jar = true;
3583 break;
3584 }
3585 }
3586 if (!is_jdk_jar) {
3587 jio_fprintf(defaultStream::output_stream(),
3588 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3589 num_ext_jars++;
3590 }
3591 }
3592 }
3593 os::closedir(dir);
3594 if (num_ext_jars > 0) {
3595 nonEmptyDirs += 1;
3596 }
3597 }
3599 // check if the default lib/endorsed directory exists; if so, error
3600 dir = os::opendir(endorsedDir);
3601 if (dir != NULL) {
3602 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3603 os::closedir(dir);
3604 nonEmptyDirs += 1;
3605 }
3607 if (nonEmptyDirs > 0) {
3608 jio_fprintf(defaultStream::output_stream(),
3609 "Endorsed standards override mechanism and extension mechanism "
3610 "will not be supported in a future release.\n"
3611 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3612 return false;
3613 }
3615 return true;
3616 }
3618 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3619 // This must be done after all -D arguments have been processed.
3620 scp_p->expand_endorsed();
3622 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3623 // Assemble the bootclasspath elements into the final path.
3624 Arguments::set_sysclasspath(scp_p->combined_path());
3625 }
3627 if (!check_endorsed_and_ext_dirs()) {
3628 return JNI_ERR;
3629 }
3631 // This must be done after all arguments have been processed
3632 // and the container support has been initialized since AggressiveHeap
3633 // relies on the amount of total memory available.
3634 if (AggressiveHeap) {
3635 jint result = set_aggressive_heap_flags();
3636 if (result != JNI_OK) {
3637 return result;
3638 }
3639 }
3640 // This must be done after all arguments have been processed.
3641 // java_compiler() true means set to "NONE" or empty.
3642 if (java_compiler() && !xdebug_mode()) {
3643 // For backwards compatibility, we switch to interpreted mode if
3644 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3645 // not specified.
3646 set_mode_flags(_int);
3647 }
3648 if (CompileThreshold == 0) {
3649 set_mode_flags(_int);
3650 }
3652 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3653 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3654 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3655 }
3657 #ifndef COMPILER2
3658 // Don't degrade server performance for footprint
3659 if (FLAG_IS_DEFAULT(UseLargePages) &&
3660 MaxHeapSize < LargePageHeapSizeThreshold) {
3661 // No need for large granularity pages w/small heaps.
3662 // Note that large pages are enabled/disabled for both the
3663 // Java heap and the code cache.
3664 FLAG_SET_DEFAULT(UseLargePages, false);
3665 }
3667 #else
3668 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3669 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3670 }
3671 #endif
3673 #ifndef TIERED
3674 // Tiered compilation is undefined.
3675 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3676 #endif
3678 // If we are running in a headless jre, force java.awt.headless property
3679 // to be true unless the property has already been set.
3680 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3681 if (os::is_headless_jre()) {
3682 const char* headless = Arguments::get_property("java.awt.headless");
3683 if (headless == NULL) {
3684 char envbuffer[128];
3685 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3686 if (!add_property("java.awt.headless=true")) {
3687 return JNI_ENOMEM;
3688 }
3689 } else {
3690 char buffer[256];
3691 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3692 if (!add_property(buffer)) {
3693 return JNI_ENOMEM;
3694 }
3695 }
3696 }
3697 }
3699 if (!check_vm_args_consistency()) {
3700 return JNI_ERR;
3701 }
3703 return JNI_OK;
3704 }
3706 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3707 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3708 scp_assembly_required_p);
3709 }
3711 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3712 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3713 scp_assembly_required_p);
3714 }
3716 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3717 const int N_MAX_OPTIONS = 64;
3718 const int OPTION_BUFFER_SIZE = 1024;
3719 char buffer[OPTION_BUFFER_SIZE];
3721 // The variable will be ignored if it exceeds the length of the buffer.
3722 // Don't check this variable if user has special privileges
3723 // (e.g. unix su command).
3724 if (os::getenv(name, buffer, sizeof(buffer)) &&
3725 !os::have_special_privileges()) {
3726 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3727 jio_fprintf(defaultStream::error_stream(),
3728 "Picked up %s: %s\n", name, buffer);
3729 char* rd = buffer; // pointer to the input string (rd)
3730 int i;
3731 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3732 while (isspace(*rd)) rd++; // skip whitespace
3733 if (*rd == 0) break; // we re done when the input string is read completely
3735 // The output, option string, overwrites the input string.
3736 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3737 // input string (rd).
3738 char* wrt = rd;
3740 options[i++].optionString = wrt; // Fill in option
3741 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3742 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3743 int quote = *rd; // matching quote to look for
3744 rd++; // don't copy open quote
3745 while (*rd != quote) { // include everything (even spaces) up until quote
3746 if (*rd == 0) { // string termination means unmatched string
3747 jio_fprintf(defaultStream::error_stream(),
3748 "Unmatched quote in %s\n", name);
3749 return JNI_ERR;
3750 }
3751 *wrt++ = *rd++; // copy to option string
3752 }
3753 rd++; // don't copy close quote
3754 } else {
3755 *wrt++ = *rd++; // copy to option string
3756 }
3757 }
3758 // Need to check if we're done before writing a NULL,
3759 // because the write could be to the byte that rd is pointing to.
3760 if (*rd++ == 0) {
3761 *wrt = 0;
3762 break;
3763 }
3764 *wrt = 0; // Zero terminate option
3765 }
3766 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3767 JavaVMInitArgs vm_args;
3768 vm_args.version = JNI_VERSION_1_2;
3769 vm_args.options = options;
3770 vm_args.nOptions = i;
3771 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3773 if (PrintVMOptions) {
3774 const char* tail;
3775 for (int i = 0; i < vm_args.nOptions; i++) {
3776 const JavaVMOption *option = vm_args.options + i;
3777 if (match_option(option, "-XX:", &tail)) {
3778 logOption(tail);
3779 }
3780 }
3781 }
3783 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3784 }
3785 return JNI_OK;
3786 }
3788 void Arguments::set_shared_spaces_flags() {
3789 if (DumpSharedSpaces) {
3790 if (FailOverToOldVerifier) {
3791 // Don't fall back to the old verifier on verification failure. If a
3792 // class fails verification with the split verifier, it might fail the
3793 // CDS runtime verifier constraint check. In that case, we don't want
3794 // to share the class. We only archive classes that pass the split verifier.
3795 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3796 }
3798 if (RequireSharedSpaces) {
3799 warning("cannot dump shared archive while using shared archive");
3800 }
3801 UseSharedSpaces = false;
3802 #ifdef _LP64
3803 if (!UseCompressedOops || !UseCompressedClassPointers) {
3804 vm_exit_during_initialization(
3805 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3806 }
3807 } else {
3808 if (!UseCompressedOops || !UseCompressedClassPointers) {
3809 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3810 }
3811 #endif
3812 }
3813 }
3815 #if !INCLUDE_ALL_GCS
3816 static void force_serial_gc() {
3817 FLAG_SET_DEFAULT(UseSerialGC, true);
3818 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3819 UNSUPPORTED_GC_OPTION(UseG1GC);
3820 UNSUPPORTED_GC_OPTION(UseParallelGC);
3821 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3822 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3823 UNSUPPORTED_GC_OPTION(UseParNewGC);
3824 }
3825 #endif // INCLUDE_ALL_GCS
3827 // Sharing support
3828 // Construct the path to the archive
3829 static char* get_shared_archive_path() {
3830 char *shared_archive_path;
3831 if (SharedArchiveFile == NULL) {
3832 char jvm_path[JVM_MAXPATHLEN];
3833 os::jvm_path(jvm_path, sizeof(jvm_path));
3834 char *end = strrchr(jvm_path, *os::file_separator());
3835 if (end != NULL) *end = '\0';
3836 size_t jvm_path_len = strlen(jvm_path);
3837 size_t file_sep_len = strlen(os::file_separator());
3838 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3839 file_sep_len + 20, mtInternal);
3840 if (shared_archive_path != NULL) {
3841 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3842 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3843 strncat(shared_archive_path, "classes.jsa", 11);
3844 }
3845 } else {
3846 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3847 if (shared_archive_path != NULL) {
3848 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3849 }
3850 }
3851 return shared_archive_path;
3852 }
3854 #ifndef PRODUCT
3855 // Determine whether LogVMOutput should be implicitly turned on.
3856 static bool use_vm_log() {
3857 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3858 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3859 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3860 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3861 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3862 return true;
3863 }
3865 #ifdef COMPILER1
3866 if (PrintC1Statistics) {
3867 return true;
3868 }
3869 #endif // COMPILER1
3871 #ifdef COMPILER2
3872 if (PrintOptoAssembly || PrintOptoStatistics) {
3873 return true;
3874 }
3875 #endif // COMPILER2
3877 return false;
3878 }
3879 #endif // PRODUCT
3881 // Parse entry point called from JNI_CreateJavaVM
3883 jint Arguments::parse(const JavaVMInitArgs* args) {
3885 // Remaining part of option string
3886 const char* tail;
3888 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3889 const char* hotspotrc = ".hotspotrc";
3890 bool settings_file_specified = false;
3891 bool needs_hotspotrc_warning = false;
3893 ArgumentsExt::process_options(args);
3895 const char* flags_file;
3896 int index;
3897 for (index = 0; index < args->nOptions; index++) {
3898 const JavaVMOption *option = args->options + index;
3899 if (match_option(option, "-XX:Flags=", &tail)) {
3900 flags_file = tail;
3901 settings_file_specified = true;
3902 }
3903 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3904 PrintVMOptions = true;
3905 }
3906 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3907 PrintVMOptions = false;
3908 }
3909 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3910 IgnoreUnrecognizedVMOptions = true;
3911 }
3912 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3913 IgnoreUnrecognizedVMOptions = false;
3914 }
3915 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3916 CommandLineFlags::printFlags(tty, false);
3917 vm_exit(0);
3918 }
3919 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3920 #if INCLUDE_NMT
3921 // The launcher did not setup nmt environment variable properly.
3922 if (!MemTracker::check_launcher_nmt_support(tail)) {
3923 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3924 }
3926 // Verify if nmt option is valid.
3927 if (MemTracker::verify_nmt_option()) {
3928 // Late initialization, still in single-threaded mode.
3929 if (MemTracker::tracking_level() >= NMT_summary) {
3930 MemTracker::init();
3931 }
3932 } else {
3933 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3934 }
3935 #else
3936 jio_fprintf(defaultStream::error_stream(),
3937 "Native Memory Tracking is not supported in this VM\n");
3938 return JNI_ERR;
3939 #endif
3940 }
3943 #ifndef PRODUCT
3944 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3945 CommandLineFlags::printFlags(tty, true);
3946 vm_exit(0);
3947 }
3948 #endif
3949 }
3951 if (IgnoreUnrecognizedVMOptions) {
3952 // uncast const to modify the flag args->ignoreUnrecognized
3953 *(jboolean*)(&args->ignoreUnrecognized) = true;
3954 }
3956 // Parse specified settings file
3957 if (settings_file_specified) {
3958 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3959 return JNI_EINVAL;
3960 }
3961 } else {
3962 #ifdef ASSERT
3963 // Parse default .hotspotrc settings file
3964 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3965 return JNI_EINVAL;
3966 }
3967 #else
3968 struct stat buf;
3969 if (os::stat(hotspotrc, &buf) == 0) {
3970 needs_hotspotrc_warning = true;
3971 }
3972 #endif
3973 }
3975 if (PrintVMOptions) {
3976 for (index = 0; index < args->nOptions; index++) {
3977 const JavaVMOption *option = args->options + index;
3978 if (match_option(option, "-XX:", &tail)) {
3979 logOption(tail);
3980 }
3981 }
3982 }
3984 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3985 jint result = parse_vm_init_args(args);
3986 if (result != JNI_OK) {
3987 return result;
3988 }
3990 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3991 SharedArchivePath = get_shared_archive_path();
3992 if (SharedArchivePath == NULL) {
3993 return JNI_ENOMEM;
3994 }
3996 // Set up VerifySharedSpaces
3997 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3998 VerifySharedSpaces = true;
3999 }
4001 // Delay warning until here so that we've had a chance to process
4002 // the -XX:-PrintWarnings flag
4003 if (needs_hotspotrc_warning) {
4004 warning("%s file is present but has been ignored. "
4005 "Run with -XX:Flags=%s to load the file.",
4006 hotspotrc, hotspotrc);
4007 }
4009 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
4010 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4011 #endif
4013 #if INCLUDE_ALL_GCS
4014 #if (defined JAVASE_EMBEDDED || defined ARM)
4015 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4016 #endif
4017 #endif
4019 #ifndef PRODUCT
4020 if (TraceBytecodesAt != 0) {
4021 TraceBytecodes = true;
4022 }
4023 if (CountCompiledCalls) {
4024 if (UseCounterDecay) {
4025 warning("UseCounterDecay disabled because CountCalls is set");
4026 UseCounterDecay = false;
4027 }
4028 }
4029 #endif // PRODUCT
4031 // JSR 292 is not supported before 1.7
4032 if (!JDK_Version::is_gte_jdk17x_version()) {
4033 if (EnableInvokeDynamic) {
4034 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4035 warning("JSR 292 is not supported before 1.7. Disabling support.");
4036 }
4037 EnableInvokeDynamic = false;
4038 }
4039 }
4041 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4042 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4043 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4044 }
4045 ScavengeRootsInCode = 1;
4046 }
4048 if (PrintGCDetails) {
4049 // Turn on -verbose:gc options as well
4050 PrintGC = true;
4051 }
4053 if (!JDK_Version::is_gte_jdk18x_version()) {
4054 // To avoid changing the log format for 7 updates this flag is only
4055 // true by default in JDK8 and above.
4056 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4057 FLAG_SET_DEFAULT(PrintGCCause, false);
4058 }
4059 }
4061 // Set object alignment values.
4062 set_object_alignment();
4064 #if !INCLUDE_ALL_GCS
4065 force_serial_gc();
4066 #endif // INCLUDE_ALL_GCS
4067 #if !INCLUDE_CDS
4068 if (DumpSharedSpaces || RequireSharedSpaces) {
4069 jio_fprintf(defaultStream::error_stream(),
4070 "Shared spaces are not supported in this VM\n");
4071 return JNI_ERR;
4072 }
4073 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4074 warning("Shared spaces are not supported in this VM");
4075 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4076 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4077 }
4078 no_shared_spaces("CDS Disabled");
4079 #endif // INCLUDE_CDS
4081 return JNI_OK;
4082 }
4084 jint Arguments::apply_ergo() {
4086 // Set flags based on ergonomics.
4087 set_ergonomics_flags();
4089 set_shared_spaces_flags();
4091 #if defined(SPARC)
4092 // BIS instructions require 'membar' instruction regardless of the number
4093 // of CPUs because in virtualized/container environments which might use only 1
4094 // CPU, BIS instructions may produce incorrect results.
4096 if (FLAG_IS_DEFAULT(AssumeMP)) {
4097 FLAG_SET_DEFAULT(AssumeMP, true);
4098 }
4099 #endif
4101 // Check the GC selections again.
4102 if (!check_gc_consistency()) {
4103 return JNI_EINVAL;
4104 }
4106 if (TieredCompilation) {
4107 set_tiered_flags();
4108 } else {
4109 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4110 if (CompilationPolicyChoice >= 2) {
4111 vm_exit_during_initialization(
4112 "Incompatible compilation policy selected", NULL);
4113 }
4114 }
4115 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4116 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4117 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4118 }
4121 // Set heap size based on available physical memory
4122 set_heap_size();
4124 ArgumentsExt::set_gc_specific_flags();
4126 // Initialize Metaspace flags and alignments.
4127 Metaspace::ergo_initialize();
4129 // Set bytecode rewriting flags
4130 set_bytecode_flags();
4132 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4133 set_aggressive_opts_flags();
4135 // Turn off biased locking for locking debug mode flags,
4136 // which are subtlely different from each other but neither works with
4137 // biased locking.
4138 if (UseHeavyMonitors
4139 #ifdef COMPILER1
4140 || !UseFastLocking
4141 #endif // COMPILER1
4142 ) {
4143 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4144 // flag set to true on command line; warn the user that they
4145 // can't enable biased locking here
4146 warning("Biased Locking is not supported with locking debug flags"
4147 "; ignoring UseBiasedLocking flag." );
4148 }
4149 UseBiasedLocking = false;
4150 }
4152 #ifdef ZERO
4153 // Clear flags not supported on zero.
4154 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4155 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4156 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4157 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4158 #endif // CC_INTERP
4160 #ifdef COMPILER2
4161 if (!EliminateLocks) {
4162 EliminateNestedLocks = false;
4163 }
4164 if (!Inline) {
4165 IncrementalInline = false;
4166 }
4167 #ifndef PRODUCT
4168 if (!IncrementalInline) {
4169 AlwaysIncrementalInline = false;
4170 }
4171 #endif
4172 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4173 // incremental inlining: bump MaxNodeLimit
4174 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4175 }
4176 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4177 // nothing to use the profiling, turn if off
4178 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4179 }
4180 #endif
4182 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4183 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4184 DebugNonSafepoints = true;
4185 }
4187 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4188 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4189 }
4191 if (UseOnStackReplacement && !UseLoopCounter) {
4192 warning("On-stack-replacement requires loop counters; enabling loop counters");
4193 FLAG_SET_DEFAULT(UseLoopCounter, true);
4194 }
4196 #ifndef PRODUCT
4197 if (CompileTheWorld) {
4198 // Force NmethodSweeper to sweep whole CodeCache each time.
4199 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4200 NmethodSweepFraction = 1;
4201 }
4202 }
4204 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4205 if (use_vm_log()) {
4206 LogVMOutput = true;
4207 }
4208 }
4209 #endif // PRODUCT
4211 if (PrintCommandLineFlags) {
4212 CommandLineFlags::printSetFlags(tty);
4213 }
4215 // Apply CPU specific policy for the BiasedLocking
4216 if (UseBiasedLocking) {
4217 if (!VM_Version::use_biased_locking() &&
4218 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4219 UseBiasedLocking = false;
4220 }
4221 }
4222 #ifdef COMPILER2
4223 if (!UseBiasedLocking || EmitSync != 0) {
4224 UseOptoBiasInlining = false;
4225 }
4226 #endif
4228 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4229 // but only if not already set on the commandline
4230 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4231 bool set = false;
4232 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4233 if (!set) {
4234 FLAG_SET_DEFAULT(PauseAtExit, true);
4235 }
4236 }
4238 return JNI_OK;
4239 }
4241 jint Arguments::adjust_after_os() {
4242 if (UseNUMA) {
4243 if (UseParallelGC || UseParallelOldGC) {
4244 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4245 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4246 }
4247 }
4248 // UseNUMAInterleaving is set to ON for all collectors and
4249 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4250 // such as the parallel collector for Linux and Solaris will
4251 // interleave old gen and survivor spaces on top of NUMA
4252 // allocation policy for the eden space.
4253 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4254 // all platforms and ParallelGC on Windows will interleave all
4255 // of the heap spaces across NUMA nodes.
4256 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4257 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4258 }
4259 }
4260 return JNI_OK;
4261 }
4263 int Arguments::PropertyList_count(SystemProperty* pl) {
4264 int count = 0;
4265 while(pl != NULL) {
4266 count++;
4267 pl = pl->next();
4268 }
4269 return count;
4270 }
4272 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4273 assert(key != NULL, "just checking");
4274 SystemProperty* prop;
4275 for (prop = pl; prop != NULL; prop = prop->next()) {
4276 if (strcmp(key, prop->key()) == 0) return prop->value();
4277 }
4278 return NULL;
4279 }
4281 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4282 int count = 0;
4283 const char* ret_val = NULL;
4285 while(pl != NULL) {
4286 if(count >= index) {
4287 ret_val = pl->key();
4288 break;
4289 }
4290 count++;
4291 pl = pl->next();
4292 }
4294 return ret_val;
4295 }
4297 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4298 int count = 0;
4299 char* ret_val = NULL;
4301 while(pl != NULL) {
4302 if(count >= index) {
4303 ret_val = pl->value();
4304 break;
4305 }
4306 count++;
4307 pl = pl->next();
4308 }
4310 return ret_val;
4311 }
4313 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4314 SystemProperty* p = *plist;
4315 if (p == NULL) {
4316 *plist = new_p;
4317 } else {
4318 while (p->next() != NULL) {
4319 p = p->next();
4320 }
4321 p->set_next(new_p);
4322 }
4323 }
4325 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4326 if (plist == NULL)
4327 return;
4329 SystemProperty* new_p = new SystemProperty(k, v, true);
4330 PropertyList_add(plist, new_p);
4331 }
4333 // This add maintains unique property key in the list.
4334 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4335 if (plist == NULL)
4336 return;
4338 // If property key exist then update with new value.
4339 SystemProperty* prop;
4340 for (prop = *plist; prop != NULL; prop = prop->next()) {
4341 if (strcmp(k, prop->key()) == 0) {
4342 if (append) {
4343 prop->append_value(v);
4344 } else {
4345 prop->set_value(v);
4346 }
4347 return;
4348 }
4349 }
4351 PropertyList_add(plist, k, v);
4352 }
4354 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4355 // Returns true if all of the source pointed by src has been copied over to
4356 // the destination buffer pointed by buf. Otherwise, returns false.
4357 // Notes:
4358 // 1. If the length (buflen) of the destination buffer excluding the
4359 // NULL terminator character is not long enough for holding the expanded
4360 // pid characters, it also returns false instead of returning the partially
4361 // expanded one.
4362 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4363 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4364 char* buf, size_t buflen) {
4365 const char* p = src;
4366 char* b = buf;
4367 const char* src_end = &src[srclen];
4368 char* buf_end = &buf[buflen - 1];
4370 while (p < src_end && b < buf_end) {
4371 if (*p == '%') {
4372 switch (*(++p)) {
4373 case '%': // "%%" ==> "%"
4374 *b++ = *p++;
4375 break;
4376 case 'p': { // "%p" ==> current process id
4377 // buf_end points to the character before the last character so
4378 // that we could write '\0' to the end of the buffer.
4379 size_t buf_sz = buf_end - b + 1;
4380 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4382 // if jio_snprintf fails or the buffer is not long enough to hold
4383 // the expanded pid, returns false.
4384 if (ret < 0 || ret >= (int)buf_sz) {
4385 return false;
4386 } else {
4387 b += ret;
4388 assert(*b == '\0', "fail in copy_expand_pid");
4389 if (p == src_end && b == buf_end + 1) {
4390 // reach the end of the buffer.
4391 return true;
4392 }
4393 }
4394 p++;
4395 break;
4396 }
4397 default :
4398 *b++ = '%';
4399 }
4400 } else {
4401 *b++ = *p++;
4402 }
4403 }
4404 *b = '\0';
4405 return (p == src_end); // return false if not all of the source was copied
4406 }