Wed, 02 Dec 2015 17:48:20 -0800
8143963: improve ClassLoader::trace_class_path to accept an additional outputStream* arg
Summary: for fixing a truncation problem on the output from -XX:+TraceClassPaths
Reviewed-by: coleenp, jiangli, cjplummer, minqi
1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #ifdef TARGET_OS_FAMILY_linux
48 # include "os_linux.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_solaris
51 # include "os_solaris.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_windows
54 # include "os_windows.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_aix
57 # include "os_aix.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_bsd
60 # include "os_bsd.inline.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
66 #endif // INCLUDE_ALL_GCS
68 // Note: This is a special bug reporting site for the JVM
69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
70 #define DEFAULT_JAVA_LAUNCHER "generic"
72 // Disable options not supported in this release, with a warning if they
73 // were explicitly requested on the command-line
74 #define UNSUPPORTED_OPTION(opt, description) \
75 do { \
76 if (opt) { \
77 if (FLAG_IS_CMDLINE(opt)) { \
78 warning(description " is disabled in this release."); \
79 } \
80 FLAG_SET_DEFAULT(opt, false); \
81 } \
82 } while(0)
84 #define UNSUPPORTED_GC_OPTION(gc) \
85 do { \
86 if (gc) { \
87 if (FLAG_IS_CMDLINE(gc)) { \
88 warning(#gc " is not supported in this VM. Using Serial GC."); \
89 } \
90 FLAG_SET_DEFAULT(gc, false); \
91 } \
92 } while(0)
94 char** Arguments::_jvm_flags_array = NULL;
95 int Arguments::_num_jvm_flags = 0;
96 char** Arguments::_jvm_args_array = NULL;
97 int Arguments::_num_jvm_args = 0;
98 char* Arguments::_java_command = NULL;
99 SystemProperty* Arguments::_system_properties = NULL;
100 const char* Arguments::_gc_log_filename = NULL;
101 bool Arguments::_has_profile = false;
102 size_t Arguments::_conservative_max_heap_alignment = 0;
103 uintx Arguments::_min_heap_size = 0;
104 uintx Arguments::_min_heap_free_ratio = 0;
105 uintx Arguments::_max_heap_free_ratio = 0;
106 Arguments::Mode Arguments::_mode = _mixed;
107 bool Arguments::_java_compiler = false;
108 bool Arguments::_xdebug_mode = false;
109 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
110 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
111 int Arguments::_sun_java_launcher_pid = -1;
112 bool Arguments::_created_by_gamma_launcher = false;
114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
115 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
116 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
117 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
118 bool Arguments::_ClipInlining = ClipInlining;
120 char* Arguments::SharedArchivePath = NULL;
122 AgentLibraryList Arguments::_libraryList;
123 AgentLibraryList Arguments::_agentList;
125 abort_hook_t Arguments::_abort_hook = NULL;
126 exit_hook_t Arguments::_exit_hook = NULL;
127 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
130 SystemProperty *Arguments::_java_ext_dirs = NULL;
131 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
132 SystemProperty *Arguments::_sun_boot_library_path = NULL;
133 SystemProperty *Arguments::_java_library_path = NULL;
134 SystemProperty *Arguments::_java_home = NULL;
135 SystemProperty *Arguments::_java_class_path = NULL;
136 SystemProperty *Arguments::_sun_boot_class_path = NULL;
138 char* Arguments::_meta_index_path = NULL;
139 char* Arguments::_meta_index_dir = NULL;
141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
143 static bool match_option(const JavaVMOption *option, const char* name,
144 const char** tail) {
145 int len = (int)strlen(name);
146 if (strncmp(option->optionString, name, len) == 0) {
147 *tail = option->optionString + len;
148 return true;
149 } else {
150 return false;
151 }
152 }
154 static void logOption(const char* opt) {
155 if (PrintVMOptions) {
156 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
157 }
158 }
160 // Process java launcher properties.
161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
162 // See if sun.java.launcher or sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
174 _sun_java_launcher_pid = atoi(tail);
175 continue;
176 }
177 }
178 }
180 // Initialize system properties key and value.
181 void Arguments::init_system_properties() {
183 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
184 "Java Virtual Machine Specification", false));
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
189 // following are JVMTI agent writeable properties.
190 // Properties values are set to NULL and they are
191 // os specific they are initialized in os::init_system_properties_values().
192 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
193 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
194 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
195 _java_library_path = new SystemProperty("java.library.path", NULL, true);
196 _java_home = new SystemProperty("java.home", NULL, true);
197 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
199 _java_class_path = new SystemProperty("java.class.path", "", true);
201 // Add to System Property list.
202 PropertyList_add(&_system_properties, _java_ext_dirs);
203 PropertyList_add(&_system_properties, _java_endorsed_dirs);
204 PropertyList_add(&_system_properties, _sun_boot_library_path);
205 PropertyList_add(&_system_properties, _java_library_path);
206 PropertyList_add(&_system_properties, _java_home);
207 PropertyList_add(&_system_properties, _java_class_path);
208 PropertyList_add(&_system_properties, _sun_boot_class_path);
210 // Set OS specific system properties values
211 os::init_system_properties_values();
212 }
215 // Update/Initialize System properties after JDK version number is known
216 void Arguments::init_version_specific_system_properties() {
217 enum { bufsz = 16 };
218 char buffer[bufsz];
219 const char* spec_vendor = "Sun Microsystems Inc.";
220 uint32_t spec_version = 0;
222 if (JDK_Version::is_gte_jdk17x_version()) {
223 spec_vendor = "Oracle Corporation";
224 spec_version = JDK_Version::current().major_version();
225 }
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 */
244 typedef struct {
245 const char* name;
246 JDK_Version obsoleted_in; // when the flag went away
247 JDK_Version accept_until; // which version to start denying the existence
248 } ObsoleteFlag;
250 static ObsoleteFlag obsolete_jvm_flags[] = {
251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
266 { "DefaultInitialRAMFraction",
267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "UseDepthFirstScavengeOrder",
269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
270 { "HandlePromotionFailure",
271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
272 { "MaxLiveObjectEvacuationRatio",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
275 { "UseParallelOldGCCompacting",
276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
277 { "UseParallelDensePrefixUpdate",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelOldGCDensePrefix",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 #ifdef PRODUCT
305 { "DesiredMethodLimit",
306 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
307 #endif // PRODUCT
308 { NULL, JDK_Version(0), JDK_Version(0) }
309 };
311 // Returns true if the flag is obsolete and fits into the range specified
312 // for being ignored. In the case that the flag is ignored, the 'version'
313 // value is filled in with the version number when the flag became
314 // obsolete so that that value can be displayed to the user.
315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
316 int i = 0;
317 assert(version != NULL, "Must provide a version buffer");
318 while (obsolete_jvm_flags[i].name != NULL) {
319 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
320 // <flag>=xxx form
321 // [-|+]<flag> form
322 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
323 ((s[0] == '+' || s[0] == '-') &&
324 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
325 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
326 *version = flag_status.obsoleted_in;
327 return true;
328 }
329 }
330 i++;
331 }
332 return false;
333 }
335 // Constructs the system class path (aka boot class path) from the following
336 // components, in order:
337 //
338 // prefix // from -Xbootclasspath/p:...
339 // endorsed // the expansion of -Djava.endorsed.dirs=...
340 // base // from os::get_system_properties() or -Xbootclasspath=
341 // suffix // from -Xbootclasspath/a:...
342 //
343 // java.endorsed.dirs is a list of directories; any jar or zip files in the
344 // directories are added to the sysclasspath just before the base.
345 //
346 // This could be AllStatic, but it isn't needed after argument processing is
347 // complete.
348 class SysClassPath: public StackObj {
349 public:
350 SysClassPath(const char* base);
351 ~SysClassPath();
353 inline void set_base(const char* base);
354 inline void add_prefix(const char* prefix);
355 inline void add_suffix_to_prefix(const char* suffix);
356 inline void add_suffix(const char* suffix);
357 inline void reset_path(const char* base);
359 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
360 // property. Must be called after all command-line arguments have been
361 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
362 // combined_path().
363 void expand_endorsed();
365 inline const char* get_base() const { return _items[_scp_base]; }
366 inline const char* get_prefix() const { return _items[_scp_prefix]; }
367 inline const char* get_suffix() const { return _items[_scp_suffix]; }
368 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
370 // Combine all the components into a single c-heap-allocated string; caller
371 // must free the string if/when no longer needed.
372 char* combined_path();
374 private:
375 // Utility routines.
376 static char* add_to_path(const char* path, const char* str, bool prepend);
377 static char* add_jars_to_path(char* path, const char* directory);
379 inline void reset_item_at(int index);
381 // Array indices for the items that make up the sysclasspath. All except the
382 // base are allocated in the C heap and freed by this class.
383 enum {
384 _scp_prefix, // from -Xbootclasspath/p:...
385 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
386 _scp_base, // the default sysclasspath
387 _scp_suffix, // from -Xbootclasspath/a:...
388 _scp_nitems // the number of items, must be last.
389 };
391 const char* _items[_scp_nitems];
392 DEBUG_ONLY(bool _expansion_done;)
393 };
395 SysClassPath::SysClassPath(const char* base) {
396 memset(_items, 0, sizeof(_items));
397 _items[_scp_base] = base;
398 DEBUG_ONLY(_expansion_done = false;)
399 }
401 SysClassPath::~SysClassPath() {
402 // Free everything except the base.
403 for (int i = 0; i < _scp_nitems; ++i) {
404 if (i != _scp_base) reset_item_at(i);
405 }
406 DEBUG_ONLY(_expansion_done = false;)
407 }
409 inline void SysClassPath::set_base(const char* base) {
410 _items[_scp_base] = base;
411 }
413 inline void SysClassPath::add_prefix(const char* prefix) {
414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
415 }
417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
419 }
421 inline void SysClassPath::add_suffix(const char* suffix) {
422 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
423 }
425 inline void SysClassPath::reset_item_at(int index) {
426 assert(index < _scp_nitems && index != _scp_base, "just checking");
427 if (_items[index] != NULL) {
428 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
429 _items[index] = NULL;
430 }
431 }
433 inline void SysClassPath::reset_path(const char* base) {
434 // Clear the prefix and suffix.
435 reset_item_at(_scp_prefix);
436 reset_item_at(_scp_suffix);
437 set_base(base);
438 }
440 //------------------------------------------------------------------------------
442 void SysClassPath::expand_endorsed() {
443 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
445 const char* path = Arguments::get_property("java.endorsed.dirs");
446 if (path == NULL) {
447 path = Arguments::get_endorsed_dir();
448 assert(path != NULL, "no default for java.endorsed.dirs");
449 }
451 char* expanded_path = NULL;
452 const char separator = *os::path_separator();
453 const char* const end = path + strlen(path);
454 while (path < end) {
455 const char* tmp_end = strchr(path, separator);
456 if (tmp_end == NULL) {
457 expanded_path = add_jars_to_path(expanded_path, path);
458 path = end;
459 } else {
460 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
461 memcpy(dirpath, path, tmp_end - path);
462 dirpath[tmp_end - path] = '\0';
463 expanded_path = add_jars_to_path(expanded_path, dirpath);
464 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
465 path = tmp_end + 1;
466 }
467 }
468 _items[_scp_endorsed] = expanded_path;
469 DEBUG_ONLY(_expansion_done = true;)
470 }
472 // Combine the bootclasspath elements, some of which may be null, into a single
473 // c-heap-allocated string.
474 char* SysClassPath::combined_path() {
475 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
476 assert(_expansion_done, "must call expand_endorsed() first.");
478 size_t lengths[_scp_nitems];
479 size_t total_len = 0;
481 const char separator = *os::path_separator();
483 // Get the lengths.
484 int i;
485 for (i = 0; i < _scp_nitems; ++i) {
486 if (_items[i] != NULL) {
487 lengths[i] = strlen(_items[i]);
488 // Include space for the separator char (or a NULL for the last item).
489 total_len += lengths[i] + 1;
490 }
491 }
492 assert(total_len > 0, "empty sysclasspath not allowed");
494 // Copy the _items to a single string.
495 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
496 char* cp_tmp = cp;
497 for (i = 0; i < _scp_nitems; ++i) {
498 if (_items[i] != NULL) {
499 memcpy(cp_tmp, _items[i], lengths[i]);
500 cp_tmp += lengths[i];
501 *cp_tmp++ = separator;
502 }
503 }
504 *--cp_tmp = '\0'; // Replace the extra separator.
505 return cp;
506 }
508 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
509 char*
510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
511 char *cp;
513 assert(str != NULL, "just checking");
514 if (path == NULL) {
515 size_t len = strlen(str) + 1;
516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
517 memcpy(cp, str, len); // copy the trailing null
518 } else {
519 const char separator = *os::path_separator();
520 size_t old_len = strlen(path);
521 size_t str_len = strlen(str);
522 size_t len = old_len + str_len + 2;
524 if (prepend) {
525 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
526 char* cp_tmp = cp;
527 memcpy(cp_tmp, str, str_len);
528 cp_tmp += str_len;
529 *cp_tmp = separator;
530 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
531 FREE_C_HEAP_ARRAY(char, path, mtInternal);
532 } else {
533 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
534 char* cp_tmp = cp + old_len;
535 *cp_tmp = separator;
536 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
537 }
538 }
539 return cp;
540 }
542 // Scan the directory and append any jar or zip files found to path.
543 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
545 DIR* dir = os::opendir(directory);
546 if (dir == NULL) return path;
548 char dir_sep[2] = { '\0', '\0' };
549 size_t directory_len = strlen(directory);
550 const char fileSep = *os::file_separator();
551 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
553 /* Scan the directory for jars/zips, appending them to path. */
554 struct dirent *entry;
555 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
556 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
557 const char* name = entry->d_name;
558 const char* ext = name + strlen(name) - 4;
559 bool isJarOrZip = ext > name &&
560 (os::file_name_strcmp(ext, ".jar") == 0 ||
561 os::file_name_strcmp(ext, ".zip") == 0);
562 if (isJarOrZip) {
563 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
564 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
565 path = add_to_path(path, jarpath, false);
566 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
567 }
568 }
569 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
570 os::closedir(dir);
571 return path;
572 }
574 // Parses a memory size specification string.
575 static bool atomull(const char *s, julong* result) {
576 julong n = 0;
577 int args_read = sscanf(s, JULONG_FORMAT, &n);
578 if (args_read != 1) {
579 return false;
580 }
581 while (*s != '\0' && isdigit(*s)) {
582 s++;
583 }
584 // 4705540: illegal if more characters are found after the first non-digit
585 if (strlen(s) > 1) {
586 return false;
587 }
588 switch (*s) {
589 case 'T': case 't':
590 *result = n * G * K;
591 // Check for overflow.
592 if (*result/((julong)G * K) != n) return false;
593 return true;
594 case 'G': case 'g':
595 *result = n * G;
596 if (*result/G != n) return false;
597 return true;
598 case 'M': case 'm':
599 *result = n * M;
600 if (*result/M != n) return false;
601 return true;
602 case 'K': case 'k':
603 *result = n * K;
604 if (*result/K != n) return false;
605 return true;
606 case '\0':
607 *result = n;
608 return true;
609 default:
610 return false;
611 }
612 }
614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
615 if (size < min_size) return arg_too_small;
616 // Check that size will fit in a size_t (only relevant on 32-bit)
617 if (size > max_uintx) return arg_too_big;
618 return arg_in_range;
619 }
621 // Describe an argument out of range error
622 void Arguments::describe_range_error(ArgsRange errcode) {
623 switch(errcode) {
624 case arg_too_big:
625 jio_fprintf(defaultStream::error_stream(),
626 "The specified size exceeds the maximum "
627 "representable size.\n");
628 break;
629 case arg_too_small:
630 case arg_unreadable:
631 case arg_in_range:
632 // do nothing for now
633 break;
634 default:
635 ShouldNotReachHere();
636 }
637 }
639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
640 return CommandLineFlags::boolAtPut(name, &value, origin);
641 }
643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
644 double v;
645 if (sscanf(value, "%lf", &v) != 1) {
646 return false;
647 }
649 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
650 return true;
651 }
652 return false;
653 }
655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
656 julong v;
657 intx intx_v;
658 bool is_neg = false;
659 // Check the sign first since atomull() parses only unsigned values.
660 if (*value == '-') {
661 if (!CommandLineFlags::intxAt(name, &intx_v)) {
662 return false;
663 }
664 value++;
665 is_neg = true;
666 }
667 if (!atomull(value, &v)) {
668 return false;
669 }
670 intx_v = (intx) v;
671 if (is_neg) {
672 intx_v = -intx_v;
673 }
674 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
675 return true;
676 }
677 uintx uintx_v = (uintx) v;
678 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
679 return true;
680 }
681 uint64_t uint64_t_v = (uint64_t) v;
682 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
683 return true;
684 }
685 return false;
686 }
688 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
689 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
690 // Contract: CommandLineFlags always returns a pointer that needs freeing.
691 FREE_C_HEAP_ARRAY(char, value, mtInternal);
692 return true;
693 }
695 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
696 const char* old_value = "";
697 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
698 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
699 size_t new_len = strlen(new_value);
700 const char* value;
701 char* free_this_too = NULL;
702 if (old_len == 0) {
703 value = new_value;
704 } else if (new_len == 0) {
705 value = old_value;
706 } else {
707 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
708 // each new setting adds another LINE to the switch:
709 sprintf(buf, "%s\n%s", old_value, new_value);
710 value = buf;
711 free_this_too = buf;
712 }
713 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
714 // CommandLineFlags always returns a pointer that needs freeing.
715 FREE_C_HEAP_ARRAY(char, value, mtInternal);
716 if (free_this_too != NULL) {
717 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
718 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
719 }
720 return true;
721 }
723 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
725 // range of acceptable characters spelled out for portability reasons
726 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
727 #define BUFLEN 255
728 char name[BUFLEN+1];
729 char dummy;
731 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
732 return set_bool_flag(name, false, origin);
733 }
734 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
735 return set_bool_flag(name, true, origin);
736 }
738 char punct;
739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
740 const char* value = strchr(arg, '=') + 1;
741 Flag* flag = Flag::find_flag(name, strlen(name));
742 if (flag != NULL && flag->is_ccstr()) {
743 if (flag->ccstr_accumulates()) {
744 return append_to_string_flag(name, value, origin);
745 } else {
746 if (value[0] == '\0') {
747 value = NULL;
748 }
749 return set_string_flag(name, value, origin);
750 }
751 }
752 }
754 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
755 const char* value = strchr(arg, '=') + 1;
756 // -XX:Foo:=xxx will reset the string flag to the given value.
757 if (value[0] == '\0') {
758 value = NULL;
759 }
760 return set_string_flag(name, value, origin);
761 }
763 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
764 #define SIGNED_NUMBER_RANGE "[-0123456789]"
765 #define NUMBER_RANGE "[0123456789]"
766 char value[BUFLEN + 1];
767 char value2[BUFLEN + 1];
768 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
769 // Looks like a floating-point number -- try again with more lenient format string
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
771 return set_fp_numeric_flag(name, value, origin);
772 }
773 }
775 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
777 return set_numeric_flag(name, value, origin);
778 }
780 return false;
781 }
783 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
784 assert(bldarray != NULL, "illegal argument");
786 if (arg == NULL) {
787 return;
788 }
790 int new_count = *count + 1;
792 // expand the array and add arg to the last element
793 if (*bldarray == NULL) {
794 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
795 } else {
796 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
797 }
798 (*bldarray)[*count] = strdup(arg);
799 *count = new_count;
800 }
802 void Arguments::build_jvm_args(const char* arg) {
803 add_string(&_jvm_args_array, &_num_jvm_args, arg);
804 }
806 void Arguments::build_jvm_flags(const char* arg) {
807 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
808 }
810 // utility function to return a string that concatenates all
811 // strings in a given char** array
812 const char* Arguments::build_resource_string(char** args, int count) {
813 if (args == NULL || count == 0) {
814 return NULL;
815 }
816 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
817 for (int i = 1; i < count; i++) {
818 length += strlen(args[i]) + 1; // add 1 for a space
819 }
820 char* s = NEW_RESOURCE_ARRAY(char, length);
821 strcpy(s, args[0]);
822 for (int j = 1; j < count; j++) {
823 strcat(s, " ");
824 strcat(s, args[j]);
825 }
826 return (const char*) s;
827 }
829 void Arguments::print_on(outputStream* st) {
830 st->print_cr("VM Arguments:");
831 if (num_jvm_flags() > 0) {
832 st->print("jvm_flags: "); print_jvm_flags_on(st);
833 }
834 if (num_jvm_args() > 0) {
835 st->print("jvm_args: "); print_jvm_args_on(st);
836 }
837 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
838 if (_java_class_path != NULL) {
839 char* path = _java_class_path->value();
840 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
841 }
842 st->print_cr("Launcher Type: %s", _sun_java_launcher);
843 }
845 void Arguments::print_jvm_flags_on(outputStream* st) {
846 if (_num_jvm_flags > 0) {
847 for (int i=0; i < _num_jvm_flags; i++) {
848 st->print("%s ", _jvm_flags_array[i]);
849 }
850 st->cr();
851 }
852 }
854 void Arguments::print_jvm_args_on(outputStream* st) {
855 if (_num_jvm_args > 0) {
856 for (int i=0; i < _num_jvm_args; i++) {
857 st->print("%s ", _jvm_args_array[i]);
858 }
859 st->cr();
860 }
861 }
863 bool Arguments::process_argument(const char* arg,
864 jboolean ignore_unrecognized, Flag::Flags origin) {
866 JDK_Version since = JDK_Version();
868 if (parse_argument(arg, origin) || ignore_unrecognized) {
869 return true;
870 }
872 bool has_plus_minus = (*arg == '+' || *arg == '-');
873 const char* const argname = has_plus_minus ? arg + 1 : arg;
874 if (is_newly_obsolete(arg, &since)) {
875 char version[256];
876 since.to_string(version, sizeof(version));
877 warning("ignoring option %s; support was removed in %s", argname, version);
878 return true;
879 }
881 // For locked flags, report a custom error message if available.
882 // Otherwise, report the standard unrecognized VM option.
884 size_t arg_len;
885 const char* equal_sign = strchr(argname, '=');
886 if (equal_sign == NULL) {
887 arg_len = strlen(argname);
888 } else {
889 arg_len = equal_sign - argname;
890 }
892 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
893 if (found_flag != NULL) {
894 char locked_message_buf[BUFLEN];
895 found_flag->get_locked_message(locked_message_buf, BUFLEN);
896 if (strlen(locked_message_buf) == 0) {
897 if (found_flag->is_bool() && !has_plus_minus) {
898 jio_fprintf(defaultStream::error_stream(),
899 "Missing +/- setting for VM option '%s'\n", argname);
900 } else if (!found_flag->is_bool() && has_plus_minus) {
901 jio_fprintf(defaultStream::error_stream(),
902 "Unexpected +/- setting in VM option '%s'\n", argname);
903 } else {
904 jio_fprintf(defaultStream::error_stream(),
905 "Improperly specified VM option '%s'\n", argname);
906 }
907 } else {
908 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
909 }
910 } else {
911 jio_fprintf(defaultStream::error_stream(),
912 "Unrecognized VM option '%s'\n", argname);
913 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
914 if (fuzzy_matched != NULL) {
915 jio_fprintf(defaultStream::error_stream(),
916 "Did you mean '%s%s%s'?\n",
917 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
918 fuzzy_matched->_name,
919 (fuzzy_matched->is_bool()) ? "" : "=<value>");
920 }
921 }
923 // allow for commandline "commenting out" options like -XX:#+Verbose
924 return arg[0] == '#';
925 }
927 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
928 FILE* stream = fopen(file_name, "rb");
929 if (stream == NULL) {
930 if (should_exist) {
931 jio_fprintf(defaultStream::error_stream(),
932 "Could not open settings file %s\n", file_name);
933 return false;
934 } else {
935 return true;
936 }
937 }
939 char token[1024];
940 int pos = 0;
942 bool in_white_space = true;
943 bool in_comment = false;
944 bool in_quote = false;
945 char quote_c = 0;
946 bool result = true;
948 int c = getc(stream);
949 while(c != EOF && pos < (int)(sizeof(token)-1)) {
950 if (in_white_space) {
951 if (in_comment) {
952 if (c == '\n') in_comment = false;
953 } else {
954 if (c == '#') in_comment = true;
955 else if (!isspace(c)) {
956 in_white_space = false;
957 token[pos++] = c;
958 }
959 }
960 } else {
961 if (c == '\n' || (!in_quote && isspace(c))) {
962 // token ends at newline, or at unquoted whitespace
963 // this allows a way to include spaces in string-valued options
964 token[pos] = '\0';
965 logOption(token);
966 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
967 build_jvm_flags(token);
968 pos = 0;
969 in_white_space = true;
970 in_quote = false;
971 } else if (!in_quote && (c == '\'' || c == '"')) {
972 in_quote = true;
973 quote_c = c;
974 } else if (in_quote && (c == quote_c)) {
975 in_quote = false;
976 } else {
977 token[pos++] = c;
978 }
979 }
980 c = getc(stream);
981 }
982 if (pos > 0) {
983 token[pos] = '\0';
984 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
985 build_jvm_flags(token);
986 }
987 fclose(stream);
988 return result;
989 }
991 //=============================================================================================================
992 // Parsing of properties (-D)
994 const char* Arguments::get_property(const char* key) {
995 return PropertyList_get_value(system_properties(), key);
996 }
998 bool Arguments::add_property(const char* prop) {
999 const char* eq = strchr(prop, '=');
1000 char* key;
1001 // ns must be static--its address may be stored in a SystemProperty object.
1002 const static char ns[1] = {0};
1003 char* value = (char *)ns;
1005 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1006 key = AllocateHeap(key_len + 1, mtInternal);
1007 strncpy(key, prop, key_len);
1008 key[key_len] = '\0';
1010 if (eq != NULL) {
1011 size_t value_len = strlen(prop) - key_len - 1;
1012 value = AllocateHeap(value_len + 1, mtInternal);
1013 strncpy(value, &prop[key_len + 1], value_len + 1);
1014 }
1016 if (strcmp(key, "java.compiler") == 0) {
1017 process_java_compiler_argument(value);
1018 FreeHeap(key);
1019 if (eq != NULL) {
1020 FreeHeap(value);
1021 }
1022 return true;
1023 } else if (strcmp(key, "sun.java.command") == 0) {
1024 _java_command = value;
1026 // Record value in Arguments, but let it get passed to Java.
1027 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1028 // launcher.pid property is private and is processed
1029 // in process_sun_java_launcher_properties();
1030 // the sun.java.launcher property is passed on to the java application
1031 FreeHeap(key);
1032 if (eq != NULL) {
1033 FreeHeap(value);
1034 }
1035 return true;
1036 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1037 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1038 // its value without going through the property list or making a Java call.
1039 _java_vendor_url_bug = value;
1040 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1041 PropertyList_unique_add(&_system_properties, key, value, true);
1042 return true;
1043 }
1044 // Create new property and add at the end of the list
1045 PropertyList_unique_add(&_system_properties, key, value);
1046 return true;
1047 }
1049 //===========================================================================================================
1050 // Setting int/mixed/comp mode flags
1052 void Arguments::set_mode_flags(Mode mode) {
1053 // Set up default values for all flags.
1054 // If you add a flag to any of the branches below,
1055 // add a default value for it here.
1056 set_java_compiler(false);
1057 _mode = mode;
1059 // Ensure Agent_OnLoad has the correct initial values.
1060 // This may not be the final mode; mode may change later in onload phase.
1061 PropertyList_unique_add(&_system_properties, "java.vm.info",
1062 (char*)VM_Version::vm_info_string(), false);
1064 UseInterpreter = true;
1065 UseCompiler = true;
1066 UseLoopCounter = true;
1068 #ifndef ZERO
1069 // Turn these off for mixed and comp. Leave them on for Zero.
1070 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1071 UseFastAccessorMethods = (mode == _int);
1072 }
1073 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1074 UseFastEmptyMethods = (mode == _int);
1075 }
1076 #endif
1078 // Default values may be platform/compiler dependent -
1079 // use the saved values
1080 ClipInlining = Arguments::_ClipInlining;
1081 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1082 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1083 BackgroundCompilation = Arguments::_BackgroundCompilation;
1085 // Change from defaults based on mode
1086 switch (mode) {
1087 default:
1088 ShouldNotReachHere();
1089 break;
1090 case _int:
1091 UseCompiler = false;
1092 UseLoopCounter = false;
1093 AlwaysCompileLoopMethods = false;
1094 UseOnStackReplacement = false;
1095 break;
1096 case _mixed:
1097 // same as default
1098 break;
1099 case _comp:
1100 UseInterpreter = false;
1101 BackgroundCompilation = false;
1102 ClipInlining = false;
1103 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1104 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1105 // compile a level 4 (C2) and then continue executing it.
1106 if (TieredCompilation) {
1107 Tier3InvokeNotifyFreqLog = 0;
1108 Tier4InvocationThreshold = 0;
1109 }
1110 break;
1111 }
1112 }
1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1115 // Conflict: required to use shared spaces (-Xshare:on), but
1116 // incompatible command line options were chosen.
1118 static void no_shared_spaces(const char* message) {
1119 if (RequireSharedSpaces) {
1120 jio_fprintf(defaultStream::error_stream(),
1121 "Class data sharing is inconsistent with other specified options.\n");
1122 vm_exit_during_initialization("Unable to use shared archive.", message);
1123 } else {
1124 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1125 }
1126 }
1127 #endif
1129 void Arguments::set_tiered_flags() {
1130 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1131 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1132 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1133 }
1134 if (CompilationPolicyChoice < 2) {
1135 vm_exit_during_initialization(
1136 "Incompatible compilation policy selected", NULL);
1137 }
1138 // Increase the code cache size - tiered compiles a lot more.
1139 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1140 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1141 }
1142 if (!UseInterpreter) { // -Xcomp
1143 Tier3InvokeNotifyFreqLog = 0;
1144 Tier4InvocationThreshold = 0;
1145 }
1146 }
1148 /**
1149 * Returns the minimum number of compiler threads needed to run the JVM. The following
1150 * configurations are possible.
1151 *
1152 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1153 * compiler threads is 0.
1154 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1155 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1156 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1157 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1158 * C1 can be used, so the minimum number of compiler threads is 1.
1159 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1160 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1161 * the minimum number of compiler threads is 2.
1162 */
1163 int Arguments::get_min_number_of_compiler_threads() {
1164 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1165 return 0; // case 1
1166 #else
1167 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1168 return 1; // case 2 or case 3
1169 }
1170 return 2; // case 4 (tiered)
1171 #endif
1172 }
1174 #if INCLUDE_ALL_GCS
1175 static void disable_adaptive_size_policy(const char* collector_name) {
1176 if (UseAdaptiveSizePolicy) {
1177 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1178 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1179 collector_name);
1180 }
1181 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1182 }
1183 }
1185 void Arguments::set_parnew_gc_flags() {
1186 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1187 "control point invariant");
1188 assert(UseParNewGC, "Error");
1190 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1191 disable_adaptive_size_policy("UseParNewGC");
1193 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1194 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1195 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1196 } else if (ParallelGCThreads == 0) {
1197 jio_fprintf(defaultStream::error_stream(),
1198 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1199 vm_exit(1);
1200 }
1202 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1203 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1204 // we set them to 1024 and 1024.
1205 // See CR 6362902.
1206 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1207 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1208 }
1209 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1210 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1211 }
1213 // AlwaysTenure flag should make ParNew promote all at first collection.
1214 // See CR 6362902.
1215 if (AlwaysTenure) {
1216 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1217 }
1218 // When using compressed oops, we use local overflow stacks,
1219 // rather than using a global overflow list chained through
1220 // the klass word of the object's pre-image.
1221 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1222 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1223 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1224 }
1225 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1226 }
1227 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1228 }
1230 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1231 // sparc/solaris for certain applications, but would gain from
1232 // further optimization and tuning efforts, and would almost
1233 // certainly gain from analysis of platform and environment.
1234 void Arguments::set_cms_and_parnew_gc_flags() {
1235 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1236 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1238 // If we are using CMS, we prefer to UseParNewGC,
1239 // unless explicitly forbidden.
1240 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1241 FLAG_SET_ERGO(bool, UseParNewGC, true);
1242 }
1244 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1245 disable_adaptive_size_policy("UseConcMarkSweepGC");
1247 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1248 // as needed.
1249 if (UseParNewGC) {
1250 set_parnew_gc_flags();
1251 }
1253 size_t max_heap = align_size_down(MaxHeapSize,
1254 CardTableRS::ct_max_alignment_constraint());
1256 // Now make adjustments for CMS
1257 intx tenuring_default = (intx)6;
1258 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1260 // Preferred young gen size for "short" pauses:
1261 // upper bound depends on # of threads and NewRatio.
1262 const uintx parallel_gc_threads =
1263 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1264 const size_t preferred_max_new_size_unaligned =
1265 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1266 size_t preferred_max_new_size =
1267 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1269 // Unless explicitly requested otherwise, size young gen
1270 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1272 // If either MaxNewSize or NewRatio is set on the command line,
1273 // assume the user is trying to set the size of the young gen.
1274 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1276 // Set MaxNewSize to our calculated preferred_max_new_size unless
1277 // NewSize was set on the command line and it is larger than
1278 // preferred_max_new_size.
1279 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1280 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1281 } else {
1282 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1283 }
1284 if (PrintGCDetails && Verbose) {
1285 // Too early to use gclog_or_tty
1286 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1287 }
1289 // Code along this path potentially sets NewSize and OldSize
1290 if (PrintGCDetails && Verbose) {
1291 // Too early to use gclog_or_tty
1292 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1293 " initial_heap_size: " SIZE_FORMAT
1294 " max_heap: " SIZE_FORMAT,
1295 min_heap_size(), InitialHeapSize, max_heap);
1296 }
1297 size_t min_new = preferred_max_new_size;
1298 if (FLAG_IS_CMDLINE(NewSize)) {
1299 min_new = NewSize;
1300 }
1301 if (max_heap > min_new && min_heap_size() > min_new) {
1302 // Unless explicitly requested otherwise, make young gen
1303 // at least min_new, and at most preferred_max_new_size.
1304 if (FLAG_IS_DEFAULT(NewSize)) {
1305 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1306 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1307 if (PrintGCDetails && Verbose) {
1308 // Too early to use gclog_or_tty
1309 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1310 }
1311 }
1312 // Unless explicitly requested otherwise, size old gen
1313 // so it's NewRatio x of NewSize.
1314 if (FLAG_IS_DEFAULT(OldSize)) {
1315 if (max_heap > NewSize) {
1316 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1317 if (PrintGCDetails && Verbose) {
1318 // Too early to use gclog_or_tty
1319 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1320 }
1321 }
1322 }
1323 }
1324 }
1325 // Unless explicitly requested otherwise, definitely
1326 // promote all objects surviving "tenuring_default" scavenges.
1327 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1328 FLAG_IS_DEFAULT(SurvivorRatio)) {
1329 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1330 }
1331 // If we decided above (or user explicitly requested)
1332 // `promote all' (via MaxTenuringThreshold := 0),
1333 // prefer minuscule survivor spaces so as not to waste
1334 // space for (non-existent) survivors
1335 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1336 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1337 }
1338 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1339 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1340 // This is done in order to make ParNew+CMS configuration to work
1341 // with YoungPLABSize and OldPLABSize options.
1342 // See CR 6362902.
1343 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1344 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1345 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1346 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1347 // the value (either from the command line or ergonomics) of
1348 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1349 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1350 } else {
1351 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1352 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1353 // we'll let it to take precedence.
1354 jio_fprintf(defaultStream::error_stream(),
1355 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1356 " options are specified for the CMS collector."
1357 " CMSParPromoteBlocksToClaim will take precedence.\n");
1358 }
1359 }
1360 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1361 // OldPLAB sizing manually turned off: Use a larger default setting,
1362 // unless it was manually specified. This is because a too-low value
1363 // will slow down scavenges.
1364 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1365 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1366 }
1367 }
1368 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1369 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1370 // If either of the static initialization defaults have changed, note this
1371 // modification.
1372 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1373 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1374 }
1376 if (!ClassUnloading) {
1377 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1378 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1379 }
1381 if (PrintGCDetails && Verbose) {
1382 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1383 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1384 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1385 }
1386 }
1387 #endif // INCLUDE_ALL_GCS
1389 void set_object_alignment() {
1390 // Object alignment.
1391 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1392 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1393 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1394 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1395 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1396 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1398 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1399 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1401 // Oop encoding heap max
1402 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1404 #if INCLUDE_ALL_GCS
1405 // Set CMS global values
1406 CompactibleFreeListSpace::set_cms_values();
1407 #endif // INCLUDE_ALL_GCS
1408 }
1410 bool verify_object_alignment() {
1411 // Object alignment.
1412 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1413 jio_fprintf(defaultStream::error_stream(),
1414 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1415 (int)ObjectAlignmentInBytes);
1416 return false;
1417 }
1418 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1419 jio_fprintf(defaultStream::error_stream(),
1420 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1421 (int)ObjectAlignmentInBytes, BytesPerLong);
1422 return false;
1423 }
1424 // It does not make sense to have big object alignment
1425 // since a space lost due to alignment will be greater
1426 // then a saved space from compressed oops.
1427 if ((int)ObjectAlignmentInBytes > 256) {
1428 jio_fprintf(defaultStream::error_stream(),
1429 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1430 (int)ObjectAlignmentInBytes);
1431 return false;
1432 }
1433 // In case page size is very small.
1434 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1435 jio_fprintf(defaultStream::error_stream(),
1436 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1437 (int)ObjectAlignmentInBytes, os::vm_page_size());
1438 return false;
1439 }
1440 if(SurvivorAlignmentInBytes == 0) {
1441 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1442 } else {
1443 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1444 jio_fprintf(defaultStream::error_stream(),
1445 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1446 (int)SurvivorAlignmentInBytes);
1447 return false;
1448 }
1449 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1450 jio_fprintf(defaultStream::error_stream(),
1451 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1452 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1453 return false;
1454 }
1455 }
1456 return true;
1457 }
1459 size_t Arguments::max_heap_for_compressed_oops() {
1460 // Avoid sign flip.
1461 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1462 // We need to fit both the NULL page and the heap into the memory budget, while
1463 // keeping alignment constraints of the heap. To guarantee the latter, as the
1464 // NULL page is located before the heap, we pad the NULL page to the conservative
1465 // maximum alignment that the GC may ever impose upon the heap.
1466 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1467 _conservative_max_heap_alignment);
1469 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1470 NOT_LP64(ShouldNotReachHere(); return 0);
1471 }
1473 bool Arguments::should_auto_select_low_pause_collector() {
1474 if (UseAutoGCSelectPolicy &&
1475 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1476 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1477 if (PrintGCDetails) {
1478 // Cannot use gclog_or_tty yet.
1479 tty->print_cr("Automatic selection of the low pause collector"
1480 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1481 }
1482 return true;
1483 }
1484 return false;
1485 }
1487 void Arguments::set_use_compressed_oops() {
1488 #ifndef ZERO
1489 #ifdef _LP64
1490 // MaxHeapSize is not set up properly at this point, but
1491 // the only value that can override MaxHeapSize if we are
1492 // to use UseCompressedOops is InitialHeapSize.
1493 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1495 if (max_heap_size <= max_heap_for_compressed_oops()) {
1496 #if !defined(COMPILER1) || defined(TIERED)
1497 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1498 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1499 }
1500 #endif
1501 #ifdef _WIN64
1502 if (UseLargePages && UseCompressedOops) {
1503 // Cannot allocate guard pages for implicit checks in indexed addressing
1504 // mode, when large pages are specified on windows.
1505 // This flag could be switched ON if narrow oop base address is set to 0,
1506 // see code in Universe::initialize_heap().
1507 Universe::set_narrow_oop_use_implicit_null_checks(false);
1508 }
1509 #endif // _WIN64
1510 } else {
1511 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1512 warning("Max heap size too large for Compressed Oops");
1513 FLAG_SET_DEFAULT(UseCompressedOops, false);
1514 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1515 }
1516 }
1517 #endif // _LP64
1518 #endif // ZERO
1519 }
1522 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1523 // set_use_compressed_oops().
1524 void Arguments::set_use_compressed_klass_ptrs() {
1525 #ifndef ZERO
1526 #ifdef _LP64
1527 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1528 if (!UseCompressedOops) {
1529 if (UseCompressedClassPointers) {
1530 warning("UseCompressedClassPointers requires UseCompressedOops");
1531 }
1532 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1533 } else {
1534 // Turn on UseCompressedClassPointers too
1535 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1536 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1537 }
1538 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1539 if (UseCompressedClassPointers) {
1540 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1541 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1542 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1543 }
1544 }
1545 }
1546 #endif // _LP64
1547 #endif // !ZERO
1548 }
1550 void Arguments::set_conservative_max_heap_alignment() {
1551 // The conservative maximum required alignment for the heap is the maximum of
1552 // the alignments imposed by several sources: any requirements from the heap
1553 // itself, the collector policy and the maximum page size we may run the VM
1554 // with.
1555 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1556 #if INCLUDE_ALL_GCS
1557 if (UseParallelGC) {
1558 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1559 } else if (UseG1GC) {
1560 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1561 }
1562 #endif // INCLUDE_ALL_GCS
1563 _conservative_max_heap_alignment = MAX4(heap_alignment,
1564 (size_t)os::vm_allocation_granularity(),
1565 os::max_page_size(),
1566 CollectorPolicy::compute_heap_alignment());
1567 }
1569 void Arguments::select_gc_ergonomically() {
1570 if (os::is_server_class_machine()) {
1571 if (should_auto_select_low_pause_collector()) {
1572 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1573 } else {
1574 FLAG_SET_ERGO(bool, UseParallelGC, true);
1575 }
1576 }
1577 }
1579 void Arguments::select_gc() {
1580 if (!gc_selected()) {
1581 select_gc_ergonomically();
1582 }
1583 }
1585 void Arguments::set_ergonomics_flags() {
1586 select_gc();
1588 #ifdef COMPILER2
1589 // Shared spaces work fine with other GCs but causes bytecode rewriting
1590 // to be disabled, which hurts interpreter performance and decreases
1591 // server performance. When -server is specified, keep the default off
1592 // unless it is asked for. Future work: either add bytecode rewriting
1593 // at link time, or rewrite bytecodes in non-shared methods.
1594 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1595 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1596 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1597 }
1598 #endif
1600 set_conservative_max_heap_alignment();
1602 #ifndef ZERO
1603 #ifdef _LP64
1604 set_use_compressed_oops();
1606 // set_use_compressed_klass_ptrs() must be called after calling
1607 // set_use_compressed_oops().
1608 set_use_compressed_klass_ptrs();
1610 // Also checks that certain machines are slower with compressed oops
1611 // in vm_version initialization code.
1612 #endif // _LP64
1613 #endif // !ZERO
1614 }
1616 void Arguments::set_parallel_gc_flags() {
1617 assert(UseParallelGC || UseParallelOldGC, "Error");
1618 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1619 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1620 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1621 }
1622 FLAG_SET_DEFAULT(UseParallelGC, true);
1624 // If no heap maximum was requested explicitly, use some reasonable fraction
1625 // of the physical memory, up to a maximum of 1GB.
1626 FLAG_SET_DEFAULT(ParallelGCThreads,
1627 Abstract_VM_Version::parallel_worker_threads());
1628 if (ParallelGCThreads == 0) {
1629 jio_fprintf(defaultStream::error_stream(),
1630 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1631 vm_exit(1);
1632 }
1634 if (UseAdaptiveSizePolicy) {
1635 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1636 // unless the user actually sets these flags.
1637 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1638 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1639 _min_heap_free_ratio = MinHeapFreeRatio;
1640 }
1641 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1642 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1643 _max_heap_free_ratio = MaxHeapFreeRatio;
1644 }
1645 }
1647 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1648 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1649 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1650 // See CR 6362902 for details.
1651 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1652 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1653 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1654 }
1655 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1656 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1657 }
1658 }
1660 if (UseParallelOldGC) {
1661 // Par compact uses lower default values since they are treated as
1662 // minimums. These are different defaults because of the different
1663 // interpretation and are not ergonomically set.
1664 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1665 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1666 }
1667 }
1668 }
1670 void Arguments::set_g1_gc_flags() {
1671 assert(UseG1GC, "Error");
1672 #ifdef COMPILER1
1673 FastTLABRefill = false;
1674 #endif
1675 FLAG_SET_DEFAULT(ParallelGCThreads,
1676 Abstract_VM_Version::parallel_worker_threads());
1677 if (ParallelGCThreads == 0) {
1678 FLAG_SET_DEFAULT(ParallelGCThreads,
1679 Abstract_VM_Version::parallel_worker_threads());
1680 }
1682 #if INCLUDE_ALL_GCS
1683 if (G1ConcRefinementThreads == 0) {
1684 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1685 }
1686 #endif
1688 // MarkStackSize will be set (if it hasn't been set by the user)
1689 // when concurrent marking is initialized.
1690 // Its value will be based upon the number of parallel marking threads.
1691 // But we do set the maximum mark stack size here.
1692 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1693 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1694 }
1696 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1697 // In G1, we want the default GC overhead goal to be higher than
1698 // say in PS. So we set it here to 10%. Otherwise the heap might
1699 // be expanded more aggressively than we would like it to. In
1700 // fact, even 10% seems to not be high enough in some cases
1701 // (especially small GC stress tests that the main thing they do
1702 // is allocation). We might consider increase it further.
1703 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1704 }
1706 if (PrintGCDetails && Verbose) {
1707 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1708 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1709 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1710 }
1711 }
1713 #if !INCLUDE_ALL_GCS
1714 #ifdef ASSERT
1715 static bool verify_serial_gc_flags() {
1716 return (UseSerialGC &&
1717 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1718 UseParallelGC || UseParallelOldGC));
1719 }
1720 #endif // ASSERT
1721 #endif // INCLUDE_ALL_GCS
1723 void Arguments::set_gc_specific_flags() {
1724 #if INCLUDE_ALL_GCS
1725 // Set per-collector flags
1726 if (UseParallelGC || UseParallelOldGC) {
1727 set_parallel_gc_flags();
1728 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1729 set_cms_and_parnew_gc_flags();
1730 } else if (UseParNewGC) { // Skipped if CMS is set above
1731 set_parnew_gc_flags();
1732 } else if (UseG1GC) {
1733 set_g1_gc_flags();
1734 }
1735 check_deprecated_gcs();
1736 check_deprecated_gc_flags();
1737 if (AssumeMP && !UseSerialGC) {
1738 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1739 warning("If the number of processors is expected to increase from one, then"
1740 " you should configure the number of parallel GC threads appropriately"
1741 " using -XX:ParallelGCThreads=N");
1742 }
1743 }
1744 if (MinHeapFreeRatio == 100) {
1745 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1746 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1747 }
1748 #else // INCLUDE_ALL_GCS
1749 assert(verify_serial_gc_flags(), "SerialGC unset");
1750 #endif // INCLUDE_ALL_GCS
1751 }
1753 julong Arguments::limit_by_allocatable_memory(julong limit) {
1754 julong max_allocatable;
1755 julong result = limit;
1756 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1757 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1758 }
1759 return result;
1760 }
1762 void Arguments::set_heap_size() {
1763 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1764 // Deprecated flag
1765 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1766 }
1768 const julong phys_mem =
1769 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1770 : (julong)MaxRAM;
1772 // If the maximum heap size has not been set with -Xmx,
1773 // then set it as fraction of the size of physical memory,
1774 // respecting the maximum and minimum sizes of the heap.
1775 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1776 julong reasonable_max = phys_mem / MaxRAMFraction;
1778 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1779 // Small physical memory, so use a minimum fraction of it for the heap
1780 reasonable_max = phys_mem / MinRAMFraction;
1781 } else {
1782 // Not-small physical memory, so require a heap at least
1783 // as large as MaxHeapSize
1784 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1785 }
1786 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1787 // Limit the heap size to ErgoHeapSizeLimit
1788 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1789 }
1790 if (UseCompressedOops) {
1791 // Limit the heap size to the maximum possible when using compressed oops
1792 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1793 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1794 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1795 // but it should be not less than default MaxHeapSize.
1796 max_coop_heap -= HeapBaseMinAddress;
1797 }
1798 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1799 }
1800 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1802 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1803 // An initial heap size was specified on the command line,
1804 // so be sure that the maximum size is consistent. Done
1805 // after call to limit_by_allocatable_memory because that
1806 // method might reduce the allocation size.
1807 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1808 }
1810 if (PrintGCDetails && Verbose) {
1811 // Cannot use gclog_or_tty yet.
1812 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1813 }
1814 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1815 }
1817 // If the minimum or initial heap_size have not been set or requested to be set
1818 // ergonomically, set them accordingly.
1819 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1820 julong reasonable_minimum = (julong)(OldSize + NewSize);
1822 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1824 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1826 if (InitialHeapSize == 0) {
1827 julong reasonable_initial = phys_mem / InitialRAMFraction;
1829 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1830 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1832 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1834 if (PrintGCDetails && Verbose) {
1835 // Cannot use gclog_or_tty yet.
1836 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1837 }
1838 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1839 }
1840 // If the minimum heap size has not been set (via -Xms),
1841 // synchronize with InitialHeapSize to avoid errors with the default value.
1842 if (min_heap_size() == 0) {
1843 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1844 if (PrintGCDetails && Verbose) {
1845 // Cannot use gclog_or_tty yet.
1846 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1847 }
1848 }
1849 }
1850 }
1852 // This must be called after ergonomics because we want bytecode rewriting
1853 // if the server compiler is used, or if UseSharedSpaces is disabled.
1854 void Arguments::set_bytecode_flags() {
1855 // Better not attempt to store into a read-only space.
1856 if (UseSharedSpaces) {
1857 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1858 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1859 }
1861 if (!RewriteBytecodes) {
1862 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1863 }
1864 }
1866 // Aggressive optimization flags -XX:+AggressiveOpts
1867 void Arguments::set_aggressive_opts_flags() {
1868 #ifdef COMPILER2
1869 if (AggressiveUnboxing) {
1870 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1871 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1872 } else if (!EliminateAutoBox) {
1873 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1874 AggressiveUnboxing = false;
1875 }
1876 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1877 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1878 } else if (!DoEscapeAnalysis) {
1879 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1880 AggressiveUnboxing = false;
1881 }
1882 }
1883 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1884 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1885 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1886 }
1887 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1888 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1889 }
1891 // Feed the cache size setting into the JDK
1892 char buffer[1024];
1893 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1894 add_property(buffer);
1895 }
1896 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1897 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1898 }
1899 #endif
1901 if (AggressiveOpts) {
1902 // Sample flag setting code
1903 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1904 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1905 // }
1906 }
1907 }
1909 //===========================================================================================================
1910 // Parsing of java.compiler property
1912 void Arguments::process_java_compiler_argument(char* arg) {
1913 // For backwards compatibility, Djava.compiler=NONE or ""
1914 // causes us to switch to -Xint mode UNLESS -Xdebug
1915 // is also specified.
1916 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1917 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1918 }
1919 }
1921 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1922 _sun_java_launcher = strdup(launcher);
1923 if (strcmp("gamma", _sun_java_launcher) == 0) {
1924 _created_by_gamma_launcher = true;
1925 }
1926 }
1928 bool Arguments::created_by_java_launcher() {
1929 assert(_sun_java_launcher != NULL, "property must have value");
1930 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1931 }
1933 bool Arguments::created_by_gamma_launcher() {
1934 return _created_by_gamma_launcher;
1935 }
1937 //===========================================================================================================
1938 // Parsing of main arguments
1940 bool Arguments::verify_interval(uintx val, uintx min,
1941 uintx max, const char* name) {
1942 // Returns true iff value is in the inclusive interval [min..max]
1943 // false, otherwise.
1944 if (val >= min && val <= max) {
1945 return true;
1946 }
1947 jio_fprintf(defaultStream::error_stream(),
1948 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1949 " and " UINTX_FORMAT "\n",
1950 name, val, min, max);
1951 return false;
1952 }
1954 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1955 // Returns true if given value is at least specified min threshold
1956 // false, otherwise.
1957 if (val >= min ) {
1958 return true;
1959 }
1960 jio_fprintf(defaultStream::error_stream(),
1961 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1962 name, val, min);
1963 return false;
1964 }
1966 bool Arguments::verify_percentage(uintx value, const char* name) {
1967 if (is_percentage(value)) {
1968 return true;
1969 }
1970 jio_fprintf(defaultStream::error_stream(),
1971 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1972 name, value);
1973 return false;
1974 }
1976 // check if do gclog rotation
1977 // +UseGCLogFileRotation is a must,
1978 // no gc log rotation when log file not supplied or
1979 // NumberOfGCLogFiles is 0
1980 void check_gclog_consistency() {
1981 if (UseGCLogFileRotation) {
1982 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1983 jio_fprintf(defaultStream::output_stream(),
1984 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1985 "where num_of_file > 0\n"
1986 "GC log rotation is turned off\n");
1987 UseGCLogFileRotation = false;
1988 }
1989 }
1991 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1992 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1993 jio_fprintf(defaultStream::output_stream(),
1994 "GCLogFileSize changed to minimum 8K\n");
1995 }
1996 }
1998 // This function is called for -Xloggc:<filename>, it can be used
1999 // to check if a given file name(or string) conforms to the following
2000 // specification:
2001 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2002 // %p and %t only allowed once. We only limit usage of filename not path
2003 bool is_filename_valid(const char *file_name) {
2004 const char* p = file_name;
2005 char file_sep = os::file_separator()[0];
2006 const char* cp;
2007 // skip prefix path
2008 for (cp = file_name; *cp != '\0'; cp++) {
2009 if (*cp == '/' || *cp == file_sep) {
2010 p = cp + 1;
2011 }
2012 }
2014 int count_p = 0;
2015 int count_t = 0;
2016 while (*p != '\0') {
2017 if ((*p >= '0' && *p <= '9') ||
2018 (*p >= 'A' && *p <= 'Z') ||
2019 (*p >= 'a' && *p <= 'z') ||
2020 *p == '-' ||
2021 *p == '_' ||
2022 *p == '.') {
2023 p++;
2024 continue;
2025 }
2026 if (*p == '%') {
2027 if(*(p + 1) == 'p') {
2028 p += 2;
2029 count_p ++;
2030 continue;
2031 }
2032 if (*(p + 1) == 't') {
2033 p += 2;
2034 count_t ++;
2035 continue;
2036 }
2037 }
2038 return false;
2039 }
2040 return count_p < 2 && count_t < 2;
2041 }
2043 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2044 if (!is_percentage(min_heap_free_ratio)) {
2045 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2046 return false;
2047 }
2048 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2049 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2050 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2051 MaxHeapFreeRatio);
2052 return false;
2053 }
2054 // This does not set the flag itself, but stores the value in a safe place for later usage.
2055 _min_heap_free_ratio = min_heap_free_ratio;
2056 return true;
2057 }
2059 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2060 if (!is_percentage(max_heap_free_ratio)) {
2061 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2062 return false;
2063 }
2064 if (max_heap_free_ratio < MinHeapFreeRatio) {
2065 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2066 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2067 MinHeapFreeRatio);
2068 return false;
2069 }
2070 // This does not set the flag itself, but stores the value in a safe place for later usage.
2071 _max_heap_free_ratio = max_heap_free_ratio;
2072 return true;
2073 }
2075 // Check consistency of GC selection
2076 bool Arguments::check_gc_consistency() {
2077 check_gclog_consistency();
2078 bool status = true;
2079 // Ensure that the user has not selected conflicting sets
2080 // of collectors. [Note: this check is merely a user convenience;
2081 // collectors over-ride each other so that only a non-conflicting
2082 // set is selected; however what the user gets is not what they
2083 // may have expected from the combination they asked for. It's
2084 // better to reduce user confusion by not allowing them to
2085 // select conflicting combinations.
2086 uint i = 0;
2087 if (UseSerialGC) i++;
2088 if (UseConcMarkSweepGC || UseParNewGC) i++;
2089 if (UseParallelGC || UseParallelOldGC) i++;
2090 if (UseG1GC) i++;
2091 if (i > 1) {
2092 jio_fprintf(defaultStream::error_stream(),
2093 "Conflicting collector combinations in option list; "
2094 "please refer to the release notes for the combinations "
2095 "allowed\n");
2096 status = false;
2097 }
2098 return status;
2099 }
2101 void Arguments::check_deprecated_gcs() {
2102 if (UseConcMarkSweepGC && !UseParNewGC) {
2103 warning("Using the DefNew young collector with the CMS collector is deprecated "
2104 "and will likely be removed in a future release");
2105 }
2107 if (UseParNewGC && !UseConcMarkSweepGC) {
2108 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2109 // set up UseSerialGC properly, so that can't be used in the check here.
2110 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2111 "and will likely be removed in a future release");
2112 }
2114 if (CMSIncrementalMode) {
2115 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2116 }
2117 }
2119 void Arguments::check_deprecated_gc_flags() {
2120 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2121 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2122 "and will likely be removed in future release");
2123 }
2124 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2125 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2126 "Use MaxRAMFraction instead.");
2127 }
2128 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2129 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2130 }
2131 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2132 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2133 }
2134 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2135 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2136 }
2137 }
2139 // Check stack pages settings
2140 bool Arguments::check_stack_pages()
2141 {
2142 bool status = true;
2143 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2144 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2145 // greater stack shadow pages can't generate instruction to bang stack
2146 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2147 return status;
2148 }
2150 // Check the consistency of vm_init_args
2151 bool Arguments::check_vm_args_consistency() {
2152 // Method for adding checks for flag consistency.
2153 // The intent is to warn the user of all possible conflicts,
2154 // before returning an error.
2155 // Note: Needs platform-dependent factoring.
2156 bool status = true;
2158 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2159 // builds so the cost of stack banging can be measured.
2160 #if (defined(PRODUCT) && defined(SOLARIS))
2161 if (!UseBoundThreads && !UseStackBanging) {
2162 jio_fprintf(defaultStream::error_stream(),
2163 "-UseStackBanging conflicts with -UseBoundThreads\n");
2165 status = false;
2166 }
2167 #endif
2169 if (TLABRefillWasteFraction == 0) {
2170 jio_fprintf(defaultStream::error_stream(),
2171 "TLABRefillWasteFraction should be a denominator, "
2172 "not " SIZE_FORMAT "\n",
2173 TLABRefillWasteFraction);
2174 status = false;
2175 }
2177 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2178 "AdaptiveSizePolicyWeight");
2179 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2181 // Divide by bucket size to prevent a large size from causing rollover when
2182 // calculating amount of memory needed to be allocated for the String table.
2183 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2184 (max_uintx / StringTable::bucket_size()), "StringTable size");
2186 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2187 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2189 {
2190 // Using "else if" below to avoid printing two error messages if min > max.
2191 // This will also prevent us from reporting both min>100 and max>100 at the
2192 // same time, but that is less annoying than printing two identical errors IMHO.
2193 FormatBuffer<80> err_msg("%s","");
2194 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2195 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2196 status = false;
2197 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2198 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2199 status = false;
2200 }
2201 }
2203 // Min/MaxMetaspaceFreeRatio
2204 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2205 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2207 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2210 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2211 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2212 MinMetaspaceFreeRatio,
2213 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2214 MaxMetaspaceFreeRatio);
2215 status = false;
2216 }
2218 // Trying to keep 100% free is not practical
2219 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2221 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2222 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2223 }
2225 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2226 // Settings to encourage splitting.
2227 if (!FLAG_IS_CMDLINE(NewRatio)) {
2228 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2229 }
2230 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2231 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2232 }
2233 }
2235 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2236 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2237 if (GCTimeLimit == 100) {
2238 // Turn off gc-overhead-limit-exceeded checks
2239 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2240 }
2242 status = status && check_gc_consistency();
2243 status = status && check_stack_pages();
2245 if (CMSIncrementalMode) {
2246 if (!UseConcMarkSweepGC) {
2247 jio_fprintf(defaultStream::error_stream(),
2248 "error: invalid argument combination.\n"
2249 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2250 "selected in order\nto use CMSIncrementalMode.\n");
2251 status = false;
2252 } else {
2253 status = status && verify_percentage(CMSIncrementalDutyCycle,
2254 "CMSIncrementalDutyCycle");
2255 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2256 "CMSIncrementalDutyCycleMin");
2257 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2258 "CMSIncrementalSafetyFactor");
2259 status = status && verify_percentage(CMSIncrementalOffset,
2260 "CMSIncrementalOffset");
2261 status = status && verify_percentage(CMSExpAvgFactor,
2262 "CMSExpAvgFactor");
2263 // If it was not set on the command line, set
2264 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2265 if (CMSInitiatingOccupancyFraction < 0) {
2266 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2267 }
2268 }
2269 }
2271 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2272 // insists that we hold the requisite locks so that the iteration is
2273 // MT-safe. For the verification at start-up and shut-down, we don't
2274 // yet have a good way of acquiring and releasing these locks,
2275 // which are not visible at the CollectedHeap level. We want to
2276 // be able to acquire these locks and then do the iteration rather
2277 // than just disable the lock verification. This will be fixed under
2278 // bug 4788986.
2279 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2280 if (VerifyDuringStartup) {
2281 warning("Heap verification at start-up disabled "
2282 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2283 VerifyDuringStartup = false; // Disable verification at start-up
2284 }
2286 if (VerifyBeforeExit) {
2287 warning("Heap verification at shutdown disabled "
2288 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2289 VerifyBeforeExit = false; // Disable verification at shutdown
2290 }
2291 }
2293 // Note: only executed in non-PRODUCT mode
2294 if (!UseAsyncConcMarkSweepGC &&
2295 (ExplicitGCInvokesConcurrent ||
2296 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2297 jio_fprintf(defaultStream::error_stream(),
2298 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2299 " with -UseAsyncConcMarkSweepGC");
2300 status = false;
2301 }
2303 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2305 #if INCLUDE_ALL_GCS
2306 if (UseG1GC) {
2307 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2308 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2309 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2311 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2312 "InitiatingHeapOccupancyPercent");
2313 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2314 "G1RefProcDrainInterval");
2315 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2316 "G1ConcMarkStepDurationMillis");
2317 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2318 "G1ConcRSHotCardLimit");
2319 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2320 "G1ConcRSLogCacheSize");
2321 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2322 "StringDeduplicationAgeThreshold");
2323 }
2324 if (UseConcMarkSweepGC) {
2325 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2326 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2327 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2328 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2330 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2332 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2333 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2334 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2336 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2338 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2339 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2341 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2342 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2343 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2345 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2347 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2349 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2350 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2351 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2352 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2353 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2354 }
2356 if (UseParallelGC || UseParallelOldGC) {
2357 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2358 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2360 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2361 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2363 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2364 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2366 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2368 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2369 }
2370 #endif // INCLUDE_ALL_GCS
2372 status = status && verify_interval(RefDiscoveryPolicy,
2373 ReferenceProcessor::DiscoveryPolicyMin,
2374 ReferenceProcessor::DiscoveryPolicyMax,
2375 "RefDiscoveryPolicy");
2377 // Limit the lower bound of this flag to 1 as it is used in a division
2378 // expression.
2379 status = status && verify_interval(TLABWasteTargetPercent,
2380 1, 100, "TLABWasteTargetPercent");
2382 status = status && verify_object_alignment();
2384 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2385 "CompressedClassSpaceSize");
2387 status = status && verify_interval(MarkStackSizeMax,
2388 1, (max_jint - 1), "MarkStackSizeMax");
2389 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2391 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2393 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2395 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2397 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2398 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2400 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2402 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2403 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2404 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2405 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2407 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2408 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2410 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2411 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2412 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2414 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2415 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2417 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2418 // just for that, so hardcode here.
2419 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2420 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2421 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2422 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2424 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2425 #ifdef COMPILER1
2426 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2427 #endif
2429 if (PrintNMTStatistics) {
2430 #if INCLUDE_NMT
2431 if (MemTracker::tracking_level() == NMT_off) {
2432 #endif // INCLUDE_NMT
2433 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2434 PrintNMTStatistics = false;
2435 #if INCLUDE_NMT
2436 }
2437 #endif
2438 }
2440 // Need to limit the extent of the padding to reasonable size.
2441 // 8K is well beyond the reasonable HW cache line size, even with the
2442 // aggressive prefetching, while still leaving the room for segregating
2443 // among the distinct pages.
2444 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2445 jio_fprintf(defaultStream::error_stream(),
2446 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2447 ContendedPaddingWidth, 0, 8192);
2448 status = false;
2449 }
2451 // Need to enforce the padding not to break the existing field alignments.
2452 // It is sufficient to check against the largest type size.
2453 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2454 jio_fprintf(defaultStream::error_stream(),
2455 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2456 ContendedPaddingWidth, BytesPerLong);
2457 status = false;
2458 }
2460 // Check lower bounds of the code cache
2461 // Template Interpreter code is approximately 3X larger in debug builds.
2462 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2463 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2466 os::vm_page_size()/K);
2467 status = false;
2468 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2469 jio_fprintf(defaultStream::error_stream(),
2470 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2471 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2472 status = false;
2473 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2474 jio_fprintf(defaultStream::error_stream(),
2475 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2476 min_code_cache_size/K);
2477 status = false;
2478 } else if (ReservedCodeCacheSize > 2*G) {
2479 // Code cache size larger than MAXINT is not supported.
2480 jio_fprintf(defaultStream::error_stream(),
2481 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2482 (2*G)/M);
2483 status = false;
2484 }
2486 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2487 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2489 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2490 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2491 }
2493 #ifdef COMPILER1
2494 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2495 #endif
2497 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2498 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2499 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2500 // Check the minimum number of compiler threads
2501 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2503 return status;
2504 }
2506 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2507 const char* option_type) {
2508 if (ignore) return false;
2510 const char* spacer = " ";
2511 if (option_type == NULL) {
2512 option_type = ++spacer; // Set both to the empty string.
2513 }
2515 if (os::obsolete_option(option)) {
2516 jio_fprintf(defaultStream::error_stream(),
2517 "Obsolete %s%soption: %s\n", option_type, spacer,
2518 option->optionString);
2519 return false;
2520 } else {
2521 jio_fprintf(defaultStream::error_stream(),
2522 "Unrecognized %s%soption: %s\n", option_type, spacer,
2523 option->optionString);
2524 return true;
2525 }
2526 }
2528 static const char* user_assertion_options[] = {
2529 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2530 };
2532 static const char* system_assertion_options[] = {
2533 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2534 };
2536 // Return true if any of the strings in null-terminated array 'names' matches.
2537 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2538 // the option must match exactly.
2539 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2540 bool tail_allowed) {
2541 for (/* empty */; *names != NULL; ++names) {
2542 if (match_option(option, *names, tail)) {
2543 if (**tail == '\0' || tail_allowed && **tail == ':') {
2544 return true;
2545 }
2546 }
2547 }
2548 return false;
2549 }
2551 bool Arguments::parse_uintx(const char* value,
2552 uintx* uintx_arg,
2553 uintx min_size) {
2555 // Check the sign first since atomull() parses only unsigned values.
2556 bool value_is_positive = !(*value == '-');
2558 if (value_is_positive) {
2559 julong n;
2560 bool good_return = atomull(value, &n);
2561 if (good_return) {
2562 bool above_minimum = n >= min_size;
2563 bool value_is_too_large = n > max_uintx;
2565 if (above_minimum && !value_is_too_large) {
2566 *uintx_arg = n;
2567 return true;
2568 }
2569 }
2570 }
2571 return false;
2572 }
2574 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2575 julong* long_arg,
2576 julong min_size) {
2577 if (!atomull(s, long_arg)) return arg_unreadable;
2578 return check_memory_size(*long_arg, min_size);
2579 }
2581 // Parse JavaVMInitArgs structure
2583 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2584 // For components of the system classpath.
2585 SysClassPath scp(Arguments::get_sysclasspath());
2586 bool scp_assembly_required = false;
2588 // Save default settings for some mode flags
2589 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2590 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2591 Arguments::_ClipInlining = ClipInlining;
2592 Arguments::_BackgroundCompilation = BackgroundCompilation;
2594 // Setup flags for mixed which is the default
2595 set_mode_flags(_mixed);
2597 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2598 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2599 if (result != JNI_OK) {
2600 return result;
2601 }
2603 // Parse JavaVMInitArgs structure passed in
2604 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2605 if (result != JNI_OK) {
2606 return result;
2607 }
2609 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2610 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2611 if (result != JNI_OK) {
2612 return result;
2613 }
2615 // Do final processing now that all arguments have been parsed
2616 result = finalize_vm_init_args(&scp, scp_assembly_required);
2617 if (result != JNI_OK) {
2618 return result;
2619 }
2621 return JNI_OK;
2622 }
2624 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2625 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2626 // are dealing with -agentpath (case where name is a path), otherwise with
2627 // -agentlib
2628 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2629 char *_name;
2630 const char *_hprof = "hprof", *_jdwp = "jdwp";
2631 size_t _len_hprof, _len_jdwp, _len_prefix;
2633 if (is_path) {
2634 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2635 return false;
2636 }
2638 _name++; // skip past last path separator
2639 _len_prefix = strlen(JNI_LIB_PREFIX);
2641 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2642 return false;
2643 }
2645 _name += _len_prefix;
2646 _len_hprof = strlen(_hprof);
2647 _len_jdwp = strlen(_jdwp);
2649 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2650 _name += _len_hprof;
2651 }
2652 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2653 _name += _len_jdwp;
2654 }
2655 else {
2656 return false;
2657 }
2659 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2660 return false;
2661 }
2663 return true;
2664 }
2666 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2667 return true;
2668 }
2670 return false;
2671 }
2673 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2674 SysClassPath* scp_p,
2675 bool* scp_assembly_required_p,
2676 Flag::Flags origin) {
2677 // Remaining part of option string
2678 const char* tail;
2680 // iterate over arguments
2681 for (int index = 0; index < args->nOptions; index++) {
2682 bool is_absolute_path = false; // for -agentpath vs -agentlib
2684 const JavaVMOption* option = args->options + index;
2686 if (!match_option(option, "-Djava.class.path", &tail) &&
2687 !match_option(option, "-Dsun.java.command", &tail) &&
2688 !match_option(option, "-Dsun.java.launcher", &tail)) {
2690 // add all jvm options to the jvm_args string. This string
2691 // is used later to set the java.vm.args PerfData string constant.
2692 // the -Djava.class.path and the -Dsun.java.command options are
2693 // omitted from jvm_args string as each have their own PerfData
2694 // string constant object.
2695 build_jvm_args(option->optionString);
2696 }
2698 // -verbose:[class/gc/jni]
2699 if (match_option(option, "-verbose", &tail)) {
2700 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2701 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2702 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2703 } else if (!strcmp(tail, ":gc")) {
2704 FLAG_SET_CMDLINE(bool, PrintGC, true);
2705 } else if (!strcmp(tail, ":jni")) {
2706 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2707 }
2708 // -da / -ea / -disableassertions / -enableassertions
2709 // These accept an optional class/package name separated by a colon, e.g.,
2710 // -da:java.lang.Thread.
2711 } else if (match_option(option, user_assertion_options, &tail, true)) {
2712 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2713 if (*tail == '\0') {
2714 JavaAssertions::setUserClassDefault(enable);
2715 } else {
2716 assert(*tail == ':', "bogus match by match_option()");
2717 JavaAssertions::addOption(tail + 1, enable);
2718 }
2719 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2720 } else if (match_option(option, system_assertion_options, &tail, false)) {
2721 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2722 JavaAssertions::setSystemClassDefault(enable);
2723 // -bootclasspath:
2724 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2725 scp_p->reset_path(tail);
2726 *scp_assembly_required_p = true;
2727 // -bootclasspath/a:
2728 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2729 scp_p->add_suffix(tail);
2730 *scp_assembly_required_p = true;
2731 // -bootclasspath/p:
2732 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2733 scp_p->add_prefix(tail);
2734 *scp_assembly_required_p = true;
2735 // -Xrun
2736 } else if (match_option(option, "-Xrun", &tail)) {
2737 if (tail != NULL) {
2738 const char* pos = strchr(tail, ':');
2739 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2740 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2741 name[len] = '\0';
2743 char *options = NULL;
2744 if(pos != NULL) {
2745 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2746 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2747 }
2748 #if !INCLUDE_JVMTI
2749 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "Profiling and debugging agents are not supported in this VM\n");
2752 return JNI_ERR;
2753 }
2754 #endif // !INCLUDE_JVMTI
2755 add_init_library(name, options);
2756 }
2757 // -agentlib and -agentpath
2758 } else if (match_option(option, "-agentlib:", &tail) ||
2759 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2760 if(tail != NULL) {
2761 const char* pos = strchr(tail, '=');
2762 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2763 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2764 name[len] = '\0';
2766 char *options = NULL;
2767 if(pos != NULL) {
2768 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2769 }
2770 #if !INCLUDE_JVMTI
2771 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2772 jio_fprintf(defaultStream::error_stream(),
2773 "Profiling and debugging agents are not supported in this VM\n");
2774 return JNI_ERR;
2775 }
2776 #endif // !INCLUDE_JVMTI
2777 add_init_agent(name, options, is_absolute_path);
2778 }
2779 // -javaagent
2780 } else if (match_option(option, "-javaagent:", &tail)) {
2781 #if !INCLUDE_JVMTI
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Instrumentation agents are not supported in this VM\n");
2784 return JNI_ERR;
2785 #else
2786 if(tail != NULL) {
2787 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2788 add_init_agent("instrument", options, false);
2789 }
2790 #endif // !INCLUDE_JVMTI
2791 // -Xnoclassgc
2792 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2793 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2794 // -Xincgc: i-CMS
2795 } else if (match_option(option, "-Xincgc", &tail)) {
2796 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2797 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2798 // -Xnoincgc: no i-CMS
2799 } else if (match_option(option, "-Xnoincgc", &tail)) {
2800 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2801 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2802 // -Xconcgc
2803 } else if (match_option(option, "-Xconcgc", &tail)) {
2804 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2805 // -Xnoconcgc
2806 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2807 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2808 // -Xbatch
2809 } else if (match_option(option, "-Xbatch", &tail)) {
2810 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2811 // -Xmn for compatibility with other JVM vendors
2812 } else if (match_option(option, "-Xmn", &tail)) {
2813 julong long_initial_young_size = 0;
2814 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2815 if (errcode != arg_in_range) {
2816 jio_fprintf(defaultStream::error_stream(),
2817 "Invalid initial young generation size: %s\n", option->optionString);
2818 describe_range_error(errcode);
2819 return JNI_EINVAL;
2820 }
2821 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2822 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2823 // -Xms
2824 } else if (match_option(option, "-Xms", &tail)) {
2825 julong long_initial_heap_size = 0;
2826 // an initial heap size of 0 means automatically determine
2827 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2828 if (errcode != arg_in_range) {
2829 jio_fprintf(defaultStream::error_stream(),
2830 "Invalid initial heap size: %s\n", option->optionString);
2831 describe_range_error(errcode);
2832 return JNI_EINVAL;
2833 }
2834 set_min_heap_size((uintx)long_initial_heap_size);
2835 // Currently the minimum size and the initial heap sizes are the same.
2836 // Can be overridden with -XX:InitialHeapSize.
2837 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2838 // -Xmx
2839 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2840 julong long_max_heap_size = 0;
2841 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2842 if (errcode != arg_in_range) {
2843 jio_fprintf(defaultStream::error_stream(),
2844 "Invalid maximum heap size: %s\n", option->optionString);
2845 describe_range_error(errcode);
2846 return JNI_EINVAL;
2847 }
2848 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2849 // Xmaxf
2850 } else if (match_option(option, "-Xmaxf", &tail)) {
2851 char* err;
2852 int maxf = (int)(strtod(tail, &err) * 100);
2853 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2854 jio_fprintf(defaultStream::error_stream(),
2855 "Bad max heap free percentage size: %s\n",
2856 option->optionString);
2857 return JNI_EINVAL;
2858 } else {
2859 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2860 }
2861 // Xminf
2862 } else if (match_option(option, "-Xminf", &tail)) {
2863 char* err;
2864 int minf = (int)(strtod(tail, &err) * 100);
2865 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2866 jio_fprintf(defaultStream::error_stream(),
2867 "Bad min heap free percentage size: %s\n",
2868 option->optionString);
2869 return JNI_EINVAL;
2870 } else {
2871 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2872 }
2873 // -Xss
2874 } else if (match_option(option, "-Xss", &tail)) {
2875 julong long_ThreadStackSize = 0;
2876 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2877 if (errcode != arg_in_range) {
2878 jio_fprintf(defaultStream::error_stream(),
2879 "Invalid thread stack size: %s\n", option->optionString);
2880 describe_range_error(errcode);
2881 return JNI_EINVAL;
2882 }
2883 // Internally track ThreadStackSize in units of 1024 bytes.
2884 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2885 round_to((int)long_ThreadStackSize, K) / K);
2886 // -Xoss
2887 } else if (match_option(option, "-Xoss", &tail)) {
2888 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2889 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2890 julong long_CodeCacheExpansionSize = 0;
2891 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2892 if (errcode != arg_in_range) {
2893 jio_fprintf(defaultStream::error_stream(),
2894 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2895 os::vm_page_size()/K);
2896 return JNI_EINVAL;
2897 }
2898 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2899 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2900 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2901 julong long_ReservedCodeCacheSize = 0;
2903 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2904 if (errcode != arg_in_range) {
2905 jio_fprintf(defaultStream::error_stream(),
2906 "Invalid maximum code cache size: %s.\n", option->optionString);
2907 return JNI_EINVAL;
2908 }
2909 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2910 //-XX:IncreaseFirstTierCompileThresholdAt=
2911 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2912 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2913 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2914 jio_fprintf(defaultStream::error_stream(),
2915 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2916 option->optionString);
2917 return JNI_EINVAL;
2918 }
2919 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2920 // -green
2921 } else if (match_option(option, "-green", &tail)) {
2922 jio_fprintf(defaultStream::error_stream(),
2923 "Green threads support not available\n");
2924 return JNI_EINVAL;
2925 // -native
2926 } else if (match_option(option, "-native", &tail)) {
2927 // HotSpot always uses native threads, ignore silently for compatibility
2928 // -Xsqnopause
2929 } else if (match_option(option, "-Xsqnopause", &tail)) {
2930 // EVM option, ignore silently for compatibility
2931 // -Xrs
2932 } else if (match_option(option, "-Xrs", &tail)) {
2933 // Classic/EVM option, new functionality
2934 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2935 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2936 // change default internal VM signals used - lower case for back compat
2937 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2938 // -Xoptimize
2939 } else if (match_option(option, "-Xoptimize", &tail)) {
2940 // EVM option, ignore silently for compatibility
2941 // -Xprof
2942 } else if (match_option(option, "-Xprof", &tail)) {
2943 #if INCLUDE_FPROF
2944 _has_profile = true;
2945 #else // INCLUDE_FPROF
2946 jio_fprintf(defaultStream::error_stream(),
2947 "Flat profiling is not supported in this VM.\n");
2948 return JNI_ERR;
2949 #endif // INCLUDE_FPROF
2950 // -Xconcurrentio
2951 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2952 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2953 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2954 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2955 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2956 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2958 // -Xinternalversion
2959 } else if (match_option(option, "-Xinternalversion", &tail)) {
2960 jio_fprintf(defaultStream::output_stream(), "%s\n",
2961 VM_Version::internal_vm_info_string());
2962 vm_exit(0);
2963 #ifndef PRODUCT
2964 // -Xprintflags
2965 } else if (match_option(option, "-Xprintflags", &tail)) {
2966 CommandLineFlags::printFlags(tty, false);
2967 vm_exit(0);
2968 #endif
2969 // -D
2970 } else if (match_option(option, "-D", &tail)) {
2971 if (CheckEndorsedAndExtDirs) {
2972 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
2973 // abort if -Djava.endorsed.dirs is set
2974 jio_fprintf(defaultStream::output_stream(),
2975 "-Djava.endorsed.dirs will not be supported in a future release.\n"
2976 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
2977 return JNI_EINVAL;
2978 }
2979 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
2980 // abort if -Djava.ext.dirs is set
2981 jio_fprintf(defaultStream::output_stream(),
2982 "-Djava.ext.dirs will not be supported in a future release.\n"
2983 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
2984 return JNI_EINVAL;
2985 }
2986 }
2988 if (!add_property(tail)) {
2989 return JNI_ENOMEM;
2990 }
2991 // Out of the box management support
2992 if (match_option(option, "-Dcom.sun.management", &tail)) {
2993 #if INCLUDE_MANAGEMENT
2994 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2995 #else
2996 jio_fprintf(defaultStream::output_stream(),
2997 "-Dcom.sun.management is not supported in this VM.\n");
2998 return JNI_ERR;
2999 #endif
3000 }
3001 // -Xint
3002 } else if (match_option(option, "-Xint", &tail)) {
3003 set_mode_flags(_int);
3004 // -Xmixed
3005 } else if (match_option(option, "-Xmixed", &tail)) {
3006 set_mode_flags(_mixed);
3007 // -Xcomp
3008 } else if (match_option(option, "-Xcomp", &tail)) {
3009 // for testing the compiler; turn off all flags that inhibit compilation
3010 set_mode_flags(_comp);
3011 // -Xshare:dump
3012 } else if (match_option(option, "-Xshare:dump", &tail)) {
3013 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3014 set_mode_flags(_int); // Prevent compilation, which creates objects
3015 // -Xshare:on
3016 } else if (match_option(option, "-Xshare:on", &tail)) {
3017 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3018 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3019 // -Xshare:auto
3020 } else if (match_option(option, "-Xshare:auto", &tail)) {
3021 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3022 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3023 // -Xshare:off
3024 } else if (match_option(option, "-Xshare:off", &tail)) {
3025 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3026 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3027 // -Xverify
3028 } else if (match_option(option, "-Xverify", &tail)) {
3029 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3030 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3031 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3032 } else if (strcmp(tail, ":remote") == 0) {
3033 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3034 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3035 } else if (strcmp(tail, ":none") == 0) {
3036 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3037 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3038 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3039 return JNI_EINVAL;
3040 }
3041 // -Xdebug
3042 } else if (match_option(option, "-Xdebug", &tail)) {
3043 // note this flag has been used, then ignore
3044 set_xdebug_mode(true);
3045 // -Xnoagent
3046 } else if (match_option(option, "-Xnoagent", &tail)) {
3047 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3048 } else if (match_option(option, "-Xboundthreads", &tail)) {
3049 // Bind user level threads to kernel threads (Solaris only)
3050 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3051 } else if (match_option(option, "-Xloggc:", &tail)) {
3052 // Redirect GC output to the file. -Xloggc:<filename>
3053 // ostream_init_log(), when called will use this filename
3054 // to initialize a fileStream.
3055 _gc_log_filename = strdup(tail);
3056 if (!is_filename_valid(_gc_log_filename)) {
3057 jio_fprintf(defaultStream::output_stream(),
3058 "Invalid file name for use with -Xloggc: Filename can only contain the "
3059 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3060 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3061 return JNI_EINVAL;
3062 }
3063 FLAG_SET_CMDLINE(bool, PrintGC, true);
3064 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3066 // JNI hooks
3067 } else if (match_option(option, "-Xcheck", &tail)) {
3068 if (!strcmp(tail, ":jni")) {
3069 #if !INCLUDE_JNI_CHECK
3070 warning("JNI CHECKING is not supported in this VM");
3071 #else
3072 CheckJNICalls = true;
3073 #endif // INCLUDE_JNI_CHECK
3074 } else if (is_bad_option(option, args->ignoreUnrecognized,
3075 "check")) {
3076 return JNI_EINVAL;
3077 }
3078 } else if (match_option(option, "vfprintf", &tail)) {
3079 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3080 } else if (match_option(option, "exit", &tail)) {
3081 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3082 } else if (match_option(option, "abort", &tail)) {
3083 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3084 // -XX:+AggressiveHeap
3085 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3087 // This option inspects the machine and attempts to set various
3088 // parameters to be optimal for long-running, memory allocation
3089 // intensive jobs. It is intended for machines with large
3090 // amounts of cpu and memory.
3092 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3093 // VM, but we may not be able to represent the total physical memory
3094 // available (like having 8gb of memory on a box but using a 32bit VM).
3095 // Thus, we need to make sure we're using a julong for intermediate
3096 // calculations.
3097 julong initHeapSize;
3098 julong total_memory = os::physical_memory();
3100 if (total_memory < (julong)256*M) {
3101 jio_fprintf(defaultStream::error_stream(),
3102 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3103 vm_exit(1);
3104 }
3106 // The heap size is half of available memory, or (at most)
3107 // all of possible memory less 160mb (leaving room for the OS
3108 // when using ISM). This is the maximum; because adaptive sizing
3109 // is turned on below, the actual space used may be smaller.
3111 initHeapSize = MIN2(total_memory / (julong)2,
3112 total_memory - (julong)160*M);
3114 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3116 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3117 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3118 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3119 // Currently the minimum size and the initial heap sizes are the same.
3120 set_min_heap_size(initHeapSize);
3121 }
3122 if (FLAG_IS_DEFAULT(NewSize)) {
3123 // Make the young generation 3/8ths of the total heap.
3124 FLAG_SET_CMDLINE(uintx, NewSize,
3125 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3126 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3127 }
3129 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3130 FLAG_SET_DEFAULT(UseLargePages, true);
3131 #endif
3133 // Increase some data structure sizes for efficiency
3134 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3135 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3136 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3138 // See the OldPLABSize comment below, but replace 'after promotion'
3139 // with 'after copying'. YoungPLABSize is the size of the survivor
3140 // space per-gc-thread buffers. The default is 4kw.
3141 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3143 // OldPLABSize is the size of the buffers in the old gen that
3144 // UseParallelGC uses to promote live data that doesn't fit in the
3145 // survivor spaces. At any given time, there's one for each gc thread.
3146 // The default size is 1kw. These buffers are rarely used, since the
3147 // survivor spaces are usually big enough. For specjbb, however, there
3148 // are occasions when there's lots of live data in the young gen
3149 // and we end up promoting some of it. We don't have a definite
3150 // explanation for why bumping OldPLABSize helps, but the theory
3151 // is that a bigger PLAB results in retaining something like the
3152 // original allocation order after promotion, which improves mutator
3153 // locality. A minor effect may be that larger PLABs reduce the
3154 // number of PLAB allocation events during gc. The value of 8kw
3155 // was arrived at by experimenting with specjbb.
3156 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3158 // Enable parallel GC and adaptive generation sizing
3159 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3160 FLAG_SET_DEFAULT(ParallelGCThreads,
3161 Abstract_VM_Version::parallel_worker_threads());
3163 // Encourage steady state memory management
3164 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3166 // This appears to improve mutator locality
3167 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3169 // Get around early Solaris scheduling bug
3170 // (affinity vs other jobs on system)
3171 // but disallow DR and offlining (5008695).
3172 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3174 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3175 // The last option must always win.
3176 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3177 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3178 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3179 // The last option must always win.
3180 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3181 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3182 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3183 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3184 jio_fprintf(defaultStream::error_stream(),
3185 "Please use CMSClassUnloadingEnabled in place of "
3186 "CMSPermGenSweepingEnabled in the future\n");
3187 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3188 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3189 jio_fprintf(defaultStream::error_stream(),
3190 "Please use -XX:+UseGCOverheadLimit in place of "
3191 "-XX:+UseGCTimeLimit in the future\n");
3192 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3193 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3194 jio_fprintf(defaultStream::error_stream(),
3195 "Please use -XX:-UseGCOverheadLimit in place of "
3196 "-XX:-UseGCTimeLimit in the future\n");
3197 // The TLE options are for compatibility with 1.3 and will be
3198 // removed without notice in a future release. These options
3199 // are not to be documented.
3200 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3201 // No longer used.
3202 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3203 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3204 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3205 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3206 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3207 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3208 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3209 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3210 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3211 // No longer used.
3212 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3213 julong long_tlab_size = 0;
3214 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3215 if (errcode != arg_in_range) {
3216 jio_fprintf(defaultStream::error_stream(),
3217 "Invalid TLAB size: %s\n", option->optionString);
3218 describe_range_error(errcode);
3219 return JNI_EINVAL;
3220 }
3221 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3222 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3223 // No longer used.
3224 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3225 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3226 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3227 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3228 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3229 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3230 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3231 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3232 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3233 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3234 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3235 #if defined(DTRACE_ENABLED)
3236 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3237 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3238 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3239 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3240 #else // defined(DTRACE_ENABLED)
3241 jio_fprintf(defaultStream::error_stream(),
3242 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3243 return JNI_EINVAL;
3244 #endif // defined(DTRACE_ENABLED)
3245 #ifdef ASSERT
3246 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3247 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3248 // disable scavenge before parallel mark-compact
3249 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3250 #endif
3251 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3252 julong cms_blocks_to_claim = (julong)atol(tail);
3253 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3254 jio_fprintf(defaultStream::error_stream(),
3255 "Please use -XX:OldPLABSize in place of "
3256 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3257 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3258 julong cms_blocks_to_claim = (julong)atol(tail);
3259 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3260 jio_fprintf(defaultStream::error_stream(),
3261 "Please use -XX:OldPLABSize in place of "
3262 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3263 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3264 julong old_plab_size = 0;
3265 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3266 if (errcode != arg_in_range) {
3267 jio_fprintf(defaultStream::error_stream(),
3268 "Invalid old PLAB size: %s\n", option->optionString);
3269 describe_range_error(errcode);
3270 return JNI_EINVAL;
3271 }
3272 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Please use -XX:OldPLABSize in place of "
3275 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3276 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3277 julong young_plab_size = 0;
3278 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3279 if (errcode != arg_in_range) {
3280 jio_fprintf(defaultStream::error_stream(),
3281 "Invalid young PLAB size: %s\n", option->optionString);
3282 describe_range_error(errcode);
3283 return JNI_EINVAL;
3284 }
3285 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3286 jio_fprintf(defaultStream::error_stream(),
3287 "Please use -XX:YoungPLABSize in place of "
3288 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3289 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3290 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3291 julong stack_size = 0;
3292 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3293 if (errcode != arg_in_range) {
3294 jio_fprintf(defaultStream::error_stream(),
3295 "Invalid mark stack size: %s\n", option->optionString);
3296 describe_range_error(errcode);
3297 return JNI_EINVAL;
3298 }
3299 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3300 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3301 julong max_stack_size = 0;
3302 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3303 if (errcode != arg_in_range) {
3304 jio_fprintf(defaultStream::error_stream(),
3305 "Invalid maximum mark stack size: %s\n",
3306 option->optionString);
3307 describe_range_error(errcode);
3308 return JNI_EINVAL;
3309 }
3310 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3311 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3312 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3313 uintx conc_threads = 0;
3314 if (!parse_uintx(tail, &conc_threads, 1)) {
3315 jio_fprintf(defaultStream::error_stream(),
3316 "Invalid concurrent threads: %s\n", option->optionString);
3317 return JNI_EINVAL;
3318 }
3319 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3320 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3321 julong max_direct_memory_size = 0;
3322 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3323 if (errcode != arg_in_range) {
3324 jio_fprintf(defaultStream::error_stream(),
3325 "Invalid maximum direct memory size: %s\n",
3326 option->optionString);
3327 describe_range_error(errcode);
3328 return JNI_EINVAL;
3329 }
3330 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3331 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3332 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3333 // away and will cause VM initialization failures!
3334 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3335 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3336 #if !INCLUDE_MANAGEMENT
3337 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3338 jio_fprintf(defaultStream::error_stream(),
3339 "ManagementServer is not supported in this VM.\n");
3340 return JNI_ERR;
3341 #endif // INCLUDE_MANAGEMENT
3342 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3343 // Skip -XX:Flags= since that case has already been handled
3344 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3345 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3346 return JNI_EINVAL;
3347 }
3348 }
3349 // Unknown option
3350 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3351 return JNI_ERR;
3352 }
3353 }
3355 // PrintSharedArchiveAndExit will turn on
3356 // -Xshare:on
3357 // -XX:+TraceClassPaths
3358 if (PrintSharedArchiveAndExit) {
3359 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3360 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3361 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3362 }
3364 // Change the default value for flags which have different default values
3365 // when working with older JDKs.
3366 #ifdef LINUX
3367 if (JDK_Version::current().compare_major(6) <= 0 &&
3368 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3369 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3370 }
3371 #endif // LINUX
3372 fix_appclasspath();
3373 return JNI_OK;
3374 }
3376 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3377 //
3378 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3379 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3380 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3381 // path is treated as the current directory.
3382 //
3383 // This causes problems with CDS, which requires that all directories specified in the classpath
3384 // must be empty. In most cases, applications do NOT want to load classes from the current
3385 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3386 // scripts compatible with CDS.
3387 void Arguments::fix_appclasspath() {
3388 if (IgnoreEmptyClassPaths) {
3389 const char separator = *os::path_separator();
3390 const char* src = _java_class_path->value();
3392 // skip over all the leading empty paths
3393 while (*src == separator) {
3394 src ++;
3395 }
3397 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3398 strncpy(copy, src, strlen(src) + 1);
3400 // trim all trailing empty paths
3401 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3402 *tail = '\0';
3403 }
3405 char from[3] = {separator, separator, '\0'};
3406 char to [2] = {separator, '\0'};
3407 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3408 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3409 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3410 }
3412 _java_class_path->set_value(copy);
3413 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3414 }
3416 if (!PrintSharedArchiveAndExit) {
3417 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3418 }
3419 }
3421 static bool has_jar_files(const char* directory) {
3422 DIR* dir = os::opendir(directory);
3423 if (dir == NULL) return false;
3425 struct dirent *entry;
3426 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3427 bool hasJarFile = false;
3428 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3429 const char* name = entry->d_name;
3430 const char* ext = name + strlen(name) - 4;
3431 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3432 }
3433 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3434 os::closedir(dir);
3435 return hasJarFile ;
3436 }
3438 // returns the number of directories in the given path containing JAR files
3439 // If the skip argument is not NULL, it will skip that directory
3440 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3441 const char separator = *os::path_separator();
3442 const char* const end = path + strlen(path);
3443 int nonEmptyDirs = 0;
3444 while (path < end) {
3445 const char* tmp_end = strchr(path, separator);
3446 if (tmp_end == NULL) {
3447 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3448 nonEmptyDirs++;
3449 jio_fprintf(defaultStream::output_stream(),
3450 "Non-empty %s directory: %s\n", type, path);
3451 }
3452 path = end;
3453 } else {
3454 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3455 memcpy(dirpath, path, tmp_end - path);
3456 dirpath[tmp_end - path] = '\0';
3457 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3458 nonEmptyDirs++;
3459 jio_fprintf(defaultStream::output_stream(),
3460 "Non-empty %s directory: %s\n", type, dirpath);
3461 }
3462 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3463 path = tmp_end + 1;
3464 }
3465 }
3466 return nonEmptyDirs;
3467 }
3469 // Returns true if endorsed standards override mechanism and extension mechanism
3470 // are not used.
3471 static bool check_endorsed_and_ext_dirs() {
3472 if (!CheckEndorsedAndExtDirs)
3473 return true;
3475 char endorsedDir[JVM_MAXPATHLEN];
3476 char extDir[JVM_MAXPATHLEN];
3477 const char* fileSep = os::file_separator();
3478 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3479 Arguments::get_java_home(), fileSep, fileSep);
3480 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3481 Arguments::get_java_home(), fileSep, fileSep);
3483 // check endorsed directory
3484 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3486 // check the extension directories but skip the default lib/ext directory
3487 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3489 // List of JAR files installed in the default lib/ext directory.
3490 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3491 static const char* jdk_ext_jars[] = {
3492 "access-bridge-32.jar",
3493 "access-bridge-64.jar",
3494 "access-bridge.jar",
3495 "cldrdata.jar",
3496 "dnsns.jar",
3497 "jaccess.jar",
3498 "jfxrt.jar",
3499 "localedata.jar",
3500 "nashorn.jar",
3501 "sunec.jar",
3502 "sunjce_provider.jar",
3503 "sunmscapi.jar",
3504 "sunpkcs11.jar",
3505 "ucrypto.jar",
3506 "zipfs.jar",
3507 NULL
3508 };
3510 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3511 DIR* dir = os::opendir(extDir);
3512 if (dir != NULL) {
3513 int num_ext_jars = 0;
3514 struct dirent *entry;
3515 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
3516 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3517 const char* name = entry->d_name;
3518 const char* ext = name + strlen(name) - 4;
3519 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3520 bool is_jdk_jar = false;
3521 const char* jarfile = NULL;
3522 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3523 if (os::file_name_strcmp(name, jarfile) == 0) {
3524 is_jdk_jar = true;
3525 break;
3526 }
3527 }
3528 if (!is_jdk_jar) {
3529 jio_fprintf(defaultStream::output_stream(),
3530 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3531 num_ext_jars++;
3532 }
3533 }
3534 }
3535 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3536 os::closedir(dir);
3537 if (num_ext_jars > 0) {
3538 nonEmptyDirs += 1;
3539 }
3540 }
3542 // check if the default lib/endorsed directory exists; if so, error
3543 dir = os::opendir(endorsedDir);
3544 if (dir != NULL) {
3545 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3546 os::closedir(dir);
3547 nonEmptyDirs += 1;
3548 }
3550 if (nonEmptyDirs > 0) {
3551 jio_fprintf(defaultStream::output_stream(),
3552 "Endorsed standards override mechanism and extension mechanism "
3553 "will not be supported in a future release.\n"
3554 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3555 return false;
3556 }
3558 return true;
3559 }
3561 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3562 // This must be done after all -D arguments have been processed.
3563 scp_p->expand_endorsed();
3565 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3566 // Assemble the bootclasspath elements into the final path.
3567 Arguments::set_sysclasspath(scp_p->combined_path());
3568 }
3570 if (!check_endorsed_and_ext_dirs()) {
3571 return JNI_ERR;
3572 }
3574 // This must be done after all arguments have been processed.
3575 // java_compiler() true means set to "NONE" or empty.
3576 if (java_compiler() && !xdebug_mode()) {
3577 // For backwards compatibility, we switch to interpreted mode if
3578 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3579 // not specified.
3580 set_mode_flags(_int);
3581 }
3582 if (CompileThreshold == 0) {
3583 set_mode_flags(_int);
3584 }
3586 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3587 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3588 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3589 }
3591 #ifndef COMPILER2
3592 // Don't degrade server performance for footprint
3593 if (FLAG_IS_DEFAULT(UseLargePages) &&
3594 MaxHeapSize < LargePageHeapSizeThreshold) {
3595 // No need for large granularity pages w/small heaps.
3596 // Note that large pages are enabled/disabled for both the
3597 // Java heap and the code cache.
3598 FLAG_SET_DEFAULT(UseLargePages, false);
3599 }
3601 #else
3602 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3603 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3604 }
3605 #endif
3607 #ifndef TIERED
3608 // Tiered compilation is undefined.
3609 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3610 #endif
3612 // If we are running in a headless jre, force java.awt.headless property
3613 // to be true unless the property has already been set.
3614 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3615 if (os::is_headless_jre()) {
3616 const char* headless = Arguments::get_property("java.awt.headless");
3617 if (headless == NULL) {
3618 char envbuffer[128];
3619 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3620 if (!add_property("java.awt.headless=true")) {
3621 return JNI_ENOMEM;
3622 }
3623 } else {
3624 char buffer[256];
3625 strcpy(buffer, "java.awt.headless=");
3626 strcat(buffer, envbuffer);
3627 if (!add_property(buffer)) {
3628 return JNI_ENOMEM;
3629 }
3630 }
3631 }
3632 }
3634 if (!check_vm_args_consistency()) {
3635 return JNI_ERR;
3636 }
3638 return JNI_OK;
3639 }
3641 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3642 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3643 scp_assembly_required_p);
3644 }
3646 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3647 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3648 scp_assembly_required_p);
3649 }
3651 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3652 const int N_MAX_OPTIONS = 64;
3653 const int OPTION_BUFFER_SIZE = 1024;
3654 char buffer[OPTION_BUFFER_SIZE];
3656 // The variable will be ignored if it exceeds the length of the buffer.
3657 // Don't check this variable if user has special privileges
3658 // (e.g. unix su command).
3659 if (os::getenv(name, buffer, sizeof(buffer)) &&
3660 !os::have_special_privileges()) {
3661 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3662 jio_fprintf(defaultStream::error_stream(),
3663 "Picked up %s: %s\n", name, buffer);
3664 char* rd = buffer; // pointer to the input string (rd)
3665 int i;
3666 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3667 while (isspace(*rd)) rd++; // skip whitespace
3668 if (*rd == 0) break; // we re done when the input string is read completely
3670 // The output, option string, overwrites the input string.
3671 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3672 // input string (rd).
3673 char* wrt = rd;
3675 options[i++].optionString = wrt; // Fill in option
3676 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3677 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3678 int quote = *rd; // matching quote to look for
3679 rd++; // don't copy open quote
3680 while (*rd != quote) { // include everything (even spaces) up until quote
3681 if (*rd == 0) { // string termination means unmatched string
3682 jio_fprintf(defaultStream::error_stream(),
3683 "Unmatched quote in %s\n", name);
3684 return JNI_ERR;
3685 }
3686 *wrt++ = *rd++; // copy to option string
3687 }
3688 rd++; // don't copy close quote
3689 } else {
3690 *wrt++ = *rd++; // copy to option string
3691 }
3692 }
3693 // Need to check if we're done before writing a NULL,
3694 // because the write could be to the byte that rd is pointing to.
3695 if (*rd++ == 0) {
3696 *wrt = 0;
3697 break;
3698 }
3699 *wrt = 0; // Zero terminate option
3700 }
3701 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3702 JavaVMInitArgs vm_args;
3703 vm_args.version = JNI_VERSION_1_2;
3704 vm_args.options = options;
3705 vm_args.nOptions = i;
3706 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3708 if (PrintVMOptions) {
3709 const char* tail;
3710 for (int i = 0; i < vm_args.nOptions; i++) {
3711 const JavaVMOption *option = vm_args.options + i;
3712 if (match_option(option, "-XX:", &tail)) {
3713 logOption(tail);
3714 }
3715 }
3716 }
3718 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3719 }
3720 return JNI_OK;
3721 }
3723 void Arguments::set_shared_spaces_flags() {
3724 if (DumpSharedSpaces) {
3725 if (RequireSharedSpaces) {
3726 warning("cannot dump shared archive while using shared archive");
3727 }
3728 UseSharedSpaces = false;
3729 #ifdef _LP64
3730 if (!UseCompressedOops || !UseCompressedClassPointers) {
3731 vm_exit_during_initialization(
3732 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3733 }
3734 } else {
3735 if (!UseCompressedOops || !UseCompressedClassPointers) {
3736 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3737 }
3738 #endif
3739 }
3740 }
3742 #if !INCLUDE_ALL_GCS
3743 static void force_serial_gc() {
3744 FLAG_SET_DEFAULT(UseSerialGC, true);
3745 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3746 UNSUPPORTED_GC_OPTION(UseG1GC);
3747 UNSUPPORTED_GC_OPTION(UseParallelGC);
3748 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3749 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3750 UNSUPPORTED_GC_OPTION(UseParNewGC);
3751 }
3752 #endif // INCLUDE_ALL_GCS
3754 // Sharing support
3755 // Construct the path to the archive
3756 static char* get_shared_archive_path() {
3757 char *shared_archive_path;
3758 if (SharedArchiveFile == NULL) {
3759 char jvm_path[JVM_MAXPATHLEN];
3760 os::jvm_path(jvm_path, sizeof(jvm_path));
3761 char *end = strrchr(jvm_path, *os::file_separator());
3762 if (end != NULL) *end = '\0';
3763 size_t jvm_path_len = strlen(jvm_path);
3764 size_t file_sep_len = strlen(os::file_separator());
3765 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3766 file_sep_len + 20, mtInternal);
3767 if (shared_archive_path != NULL) {
3768 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3769 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3770 strncat(shared_archive_path, "classes.jsa", 11);
3771 }
3772 } else {
3773 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3774 if (shared_archive_path != NULL) {
3775 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3776 }
3777 }
3778 return shared_archive_path;
3779 }
3781 #ifndef PRODUCT
3782 // Determine whether LogVMOutput should be implicitly turned on.
3783 static bool use_vm_log() {
3784 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3785 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3786 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3787 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3788 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3789 return true;
3790 }
3792 #ifdef COMPILER1
3793 if (PrintC1Statistics) {
3794 return true;
3795 }
3796 #endif // COMPILER1
3798 #ifdef COMPILER2
3799 if (PrintOptoAssembly || PrintOptoStatistics) {
3800 return true;
3801 }
3802 #endif // COMPILER2
3804 return false;
3805 }
3806 #endif // PRODUCT
3808 // Parse entry point called from JNI_CreateJavaVM
3810 jint Arguments::parse(const JavaVMInitArgs* args) {
3812 // Remaining part of option string
3813 const char* tail;
3815 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3816 const char* hotspotrc = ".hotspotrc";
3817 bool settings_file_specified = false;
3818 bool needs_hotspotrc_warning = false;
3820 ArgumentsExt::process_options(args);
3822 const char* flags_file;
3823 int index;
3824 for (index = 0; index < args->nOptions; index++) {
3825 const JavaVMOption *option = args->options + index;
3826 if (match_option(option, "-XX:Flags=", &tail)) {
3827 flags_file = tail;
3828 settings_file_specified = true;
3829 }
3830 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3831 PrintVMOptions = true;
3832 }
3833 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3834 PrintVMOptions = false;
3835 }
3836 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3837 IgnoreUnrecognizedVMOptions = true;
3838 }
3839 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3840 IgnoreUnrecognizedVMOptions = false;
3841 }
3842 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3843 CommandLineFlags::printFlags(tty, false);
3844 vm_exit(0);
3845 }
3846 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3847 #if INCLUDE_NMT
3848 // The launcher did not setup nmt environment variable properly.
3849 if (!MemTracker::check_launcher_nmt_support(tail)) {
3850 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3851 }
3853 // Verify if nmt option is valid.
3854 if (MemTracker::verify_nmt_option()) {
3855 // Late initialization, still in single-threaded mode.
3856 if (MemTracker::tracking_level() >= NMT_summary) {
3857 MemTracker::init();
3858 }
3859 } else {
3860 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3861 }
3862 #else
3863 jio_fprintf(defaultStream::error_stream(),
3864 "Native Memory Tracking is not supported in this VM\n");
3865 return JNI_ERR;
3866 #endif
3867 }
3870 #ifndef PRODUCT
3871 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3872 CommandLineFlags::printFlags(tty, true);
3873 vm_exit(0);
3874 }
3875 #endif
3876 }
3878 if (IgnoreUnrecognizedVMOptions) {
3879 // uncast const to modify the flag args->ignoreUnrecognized
3880 *(jboolean*)(&args->ignoreUnrecognized) = true;
3881 }
3883 // Parse specified settings file
3884 if (settings_file_specified) {
3885 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3886 return JNI_EINVAL;
3887 }
3888 } else {
3889 #ifdef ASSERT
3890 // Parse default .hotspotrc settings file
3891 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3892 return JNI_EINVAL;
3893 }
3894 #else
3895 struct stat buf;
3896 if (os::stat(hotspotrc, &buf) == 0) {
3897 needs_hotspotrc_warning = true;
3898 }
3899 #endif
3900 }
3902 if (PrintVMOptions) {
3903 for (index = 0; index < args->nOptions; index++) {
3904 const JavaVMOption *option = args->options + index;
3905 if (match_option(option, "-XX:", &tail)) {
3906 logOption(tail);
3907 }
3908 }
3909 }
3911 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3912 jint result = parse_vm_init_args(args);
3913 if (result != JNI_OK) {
3914 return result;
3915 }
3917 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3918 SharedArchivePath = get_shared_archive_path();
3919 if (SharedArchivePath == NULL) {
3920 return JNI_ENOMEM;
3921 }
3923 // Set up VerifySharedSpaces
3924 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3925 VerifySharedSpaces = true;
3926 }
3928 // Delay warning until here so that we've had a chance to process
3929 // the -XX:-PrintWarnings flag
3930 if (needs_hotspotrc_warning) {
3931 warning("%s file is present but has been ignored. "
3932 "Run with -XX:Flags=%s to load the file.",
3933 hotspotrc, hotspotrc);
3934 }
3936 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3937 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3938 #endif
3940 #if INCLUDE_ALL_GCS
3941 #if (defined JAVASE_EMBEDDED || defined ARM)
3942 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3943 #endif
3944 #endif
3946 #ifndef PRODUCT
3947 if (TraceBytecodesAt != 0) {
3948 TraceBytecodes = true;
3949 }
3950 if (CountCompiledCalls) {
3951 if (UseCounterDecay) {
3952 warning("UseCounterDecay disabled because CountCalls is set");
3953 UseCounterDecay = false;
3954 }
3955 }
3956 #endif // PRODUCT
3958 // JSR 292 is not supported before 1.7
3959 if (!JDK_Version::is_gte_jdk17x_version()) {
3960 if (EnableInvokeDynamic) {
3961 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3962 warning("JSR 292 is not supported before 1.7. Disabling support.");
3963 }
3964 EnableInvokeDynamic = false;
3965 }
3966 }
3968 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3969 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3970 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3971 }
3972 ScavengeRootsInCode = 1;
3973 }
3975 if (PrintGCDetails) {
3976 // Turn on -verbose:gc options as well
3977 PrintGC = true;
3978 }
3980 if (!JDK_Version::is_gte_jdk18x_version()) {
3981 // To avoid changing the log format for 7 updates this flag is only
3982 // true by default in JDK8 and above.
3983 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3984 FLAG_SET_DEFAULT(PrintGCCause, false);
3985 }
3986 }
3988 // Set object alignment values.
3989 set_object_alignment();
3991 #if !INCLUDE_ALL_GCS
3992 force_serial_gc();
3993 #endif // INCLUDE_ALL_GCS
3994 #if !INCLUDE_CDS
3995 if (DumpSharedSpaces || RequireSharedSpaces) {
3996 jio_fprintf(defaultStream::error_stream(),
3997 "Shared spaces are not supported in this VM\n");
3998 return JNI_ERR;
3999 }
4000 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4001 warning("Shared spaces are not supported in this VM");
4002 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4003 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4004 }
4005 no_shared_spaces("CDS Disabled");
4006 #endif // INCLUDE_CDS
4008 return JNI_OK;
4009 }
4011 jint Arguments::apply_ergo() {
4013 // Set flags based on ergonomics.
4014 set_ergonomics_flags();
4016 set_shared_spaces_flags();
4018 // Check the GC selections again.
4019 if (!check_gc_consistency()) {
4020 return JNI_EINVAL;
4021 }
4023 if (TieredCompilation) {
4024 set_tiered_flags();
4025 } else {
4026 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4027 if (CompilationPolicyChoice >= 2) {
4028 vm_exit_during_initialization(
4029 "Incompatible compilation policy selected", NULL);
4030 }
4031 }
4032 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4033 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4034 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4035 }
4038 // Set heap size based on available physical memory
4039 set_heap_size();
4041 ArgumentsExt::set_gc_specific_flags();
4043 // Initialize Metaspace flags and alignments.
4044 Metaspace::ergo_initialize();
4046 // Set bytecode rewriting flags
4047 set_bytecode_flags();
4049 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4050 set_aggressive_opts_flags();
4052 // Turn off biased locking for locking debug mode flags,
4053 // which are subtlely different from each other but neither works with
4054 // biased locking.
4055 if (UseHeavyMonitors
4056 #ifdef COMPILER1
4057 || !UseFastLocking
4058 #endif // COMPILER1
4059 ) {
4060 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4061 // flag set to true on command line; warn the user that they
4062 // can't enable biased locking here
4063 warning("Biased Locking is not supported with locking debug flags"
4064 "; ignoring UseBiasedLocking flag." );
4065 }
4066 UseBiasedLocking = false;
4067 }
4069 #ifdef ZERO
4070 // Clear flags not supported on zero.
4071 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4072 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4073 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4074 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4075 #endif // CC_INTERP
4077 #ifdef COMPILER2
4078 if (!EliminateLocks) {
4079 EliminateNestedLocks = false;
4080 }
4081 if (!Inline) {
4082 IncrementalInline = false;
4083 }
4084 #ifndef PRODUCT
4085 if (!IncrementalInline) {
4086 AlwaysIncrementalInline = false;
4087 }
4088 #endif
4089 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4090 // incremental inlining: bump MaxNodeLimit
4091 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4092 }
4093 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4094 // nothing to use the profiling, turn if off
4095 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4096 }
4097 #endif
4099 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4100 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4101 DebugNonSafepoints = true;
4102 }
4104 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4105 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4106 }
4108 #ifndef PRODUCT
4109 if (CompileTheWorld) {
4110 // Force NmethodSweeper to sweep whole CodeCache each time.
4111 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4112 NmethodSweepFraction = 1;
4113 }
4114 }
4116 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4117 if (use_vm_log()) {
4118 LogVMOutput = true;
4119 }
4120 }
4121 #endif // PRODUCT
4123 if (PrintCommandLineFlags) {
4124 CommandLineFlags::printSetFlags(tty);
4125 }
4127 // Apply CPU specific policy for the BiasedLocking
4128 if (UseBiasedLocking) {
4129 if (!VM_Version::use_biased_locking() &&
4130 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4131 UseBiasedLocking = false;
4132 }
4133 }
4134 #ifdef COMPILER2
4135 if (!UseBiasedLocking || EmitSync != 0) {
4136 UseOptoBiasInlining = false;
4137 }
4138 #endif
4140 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4141 // but only if not already set on the commandline
4142 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4143 bool set = false;
4144 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4145 if (!set) {
4146 FLAG_SET_DEFAULT(PauseAtExit, true);
4147 }
4148 }
4150 return JNI_OK;
4151 }
4153 jint Arguments::adjust_after_os() {
4154 if (UseNUMA) {
4155 if (UseParallelGC || UseParallelOldGC) {
4156 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4157 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4158 }
4159 }
4160 // UseNUMAInterleaving is set to ON for all collectors and
4161 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4162 // such as the parallel collector for Linux and Solaris will
4163 // interleave old gen and survivor spaces on top of NUMA
4164 // allocation policy for the eden space.
4165 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4166 // all platforms and ParallelGC on Windows will interleave all
4167 // of the heap spaces across NUMA nodes.
4168 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4169 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4170 }
4171 }
4172 return JNI_OK;
4173 }
4175 int Arguments::PropertyList_count(SystemProperty* pl) {
4176 int count = 0;
4177 while(pl != NULL) {
4178 count++;
4179 pl = pl->next();
4180 }
4181 return count;
4182 }
4184 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4185 assert(key != NULL, "just checking");
4186 SystemProperty* prop;
4187 for (prop = pl; prop != NULL; prop = prop->next()) {
4188 if (strcmp(key, prop->key()) == 0) return prop->value();
4189 }
4190 return NULL;
4191 }
4193 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4194 int count = 0;
4195 const char* ret_val = NULL;
4197 while(pl != NULL) {
4198 if(count >= index) {
4199 ret_val = pl->key();
4200 break;
4201 }
4202 count++;
4203 pl = pl->next();
4204 }
4206 return ret_val;
4207 }
4209 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4210 int count = 0;
4211 char* ret_val = NULL;
4213 while(pl != NULL) {
4214 if(count >= index) {
4215 ret_val = pl->value();
4216 break;
4217 }
4218 count++;
4219 pl = pl->next();
4220 }
4222 return ret_val;
4223 }
4225 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4226 SystemProperty* p = *plist;
4227 if (p == NULL) {
4228 *plist = new_p;
4229 } else {
4230 while (p->next() != NULL) {
4231 p = p->next();
4232 }
4233 p->set_next(new_p);
4234 }
4235 }
4237 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4238 if (plist == NULL)
4239 return;
4241 SystemProperty* new_p = new SystemProperty(k, v, true);
4242 PropertyList_add(plist, new_p);
4243 }
4245 // This add maintains unique property key in the list.
4246 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4247 if (plist == NULL)
4248 return;
4250 // If property key exist then update with new value.
4251 SystemProperty* prop;
4252 for (prop = *plist; prop != NULL; prop = prop->next()) {
4253 if (strcmp(k, prop->key()) == 0) {
4254 if (append) {
4255 prop->append_value(v);
4256 } else {
4257 prop->set_value(v);
4258 }
4259 return;
4260 }
4261 }
4263 PropertyList_add(plist, k, v);
4264 }
4266 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4267 // Returns true if all of the source pointed by src has been copied over to
4268 // the destination buffer pointed by buf. Otherwise, returns false.
4269 // Notes:
4270 // 1. If the length (buflen) of the destination buffer excluding the
4271 // NULL terminator character is not long enough for holding the expanded
4272 // pid characters, it also returns false instead of returning the partially
4273 // expanded one.
4274 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4275 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4276 char* buf, size_t buflen) {
4277 const char* p = src;
4278 char* b = buf;
4279 const char* src_end = &src[srclen];
4280 char* buf_end = &buf[buflen - 1];
4282 while (p < src_end && b < buf_end) {
4283 if (*p == '%') {
4284 switch (*(++p)) {
4285 case '%': // "%%" ==> "%"
4286 *b++ = *p++;
4287 break;
4288 case 'p': { // "%p" ==> current process id
4289 // buf_end points to the character before the last character so
4290 // that we could write '\0' to the end of the buffer.
4291 size_t buf_sz = buf_end - b + 1;
4292 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4294 // if jio_snprintf fails or the buffer is not long enough to hold
4295 // the expanded pid, returns false.
4296 if (ret < 0 || ret >= (int)buf_sz) {
4297 return false;
4298 } else {
4299 b += ret;
4300 assert(*b == '\0', "fail in copy_expand_pid");
4301 if (p == src_end && b == buf_end + 1) {
4302 // reach the end of the buffer.
4303 return true;
4304 }
4305 }
4306 p++;
4307 break;
4308 }
4309 default :
4310 *b++ = '%';
4311 }
4312 } else {
4313 *b++ = *p++;
4314 }
4315 }
4316 *b = '\0';
4317 return (p == src_end); // return false if not all of the source was copied
4318 }