Fri, 17 Mar 2017 03:39:23 -0700
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
Summary: Add support for VM_Version::L1_data_cache_line_size().
Reviewed-by: dsimms, kvn, dholmes
1 /*
2 * Copyright (c) 1997, 2017, 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 size_t length = directory_len + 2 + strlen(name);
564 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
565 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
566 path = add_to_path(path, jarpath, false);
567 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
568 }
569 }
570 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
571 os::closedir(dir);
572 return path;
573 }
575 // Parses a memory size specification string.
576 static bool atomull(const char *s, julong* result) {
577 julong n = 0;
578 int args_read = sscanf(s, JULONG_FORMAT, &n);
579 if (args_read != 1) {
580 return false;
581 }
582 while (*s != '\0' && isdigit(*s)) {
583 s++;
584 }
585 // 4705540: illegal if more characters are found after the first non-digit
586 if (strlen(s) > 1) {
587 return false;
588 }
589 switch (*s) {
590 case 'T': case 't':
591 *result = n * G * K;
592 // Check for overflow.
593 if (*result/((julong)G * K) != n) return false;
594 return true;
595 case 'G': case 'g':
596 *result = n * G;
597 if (*result/G != n) return false;
598 return true;
599 case 'M': case 'm':
600 *result = n * M;
601 if (*result/M != n) return false;
602 return true;
603 case 'K': case 'k':
604 *result = n * K;
605 if (*result/K != n) return false;
606 return true;
607 case '\0':
608 *result = n;
609 return true;
610 default:
611 return false;
612 }
613 }
615 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
616 if (size < min_size) return arg_too_small;
617 // Check that size will fit in a size_t (only relevant on 32-bit)
618 if (size > max_uintx) return arg_too_big;
619 return arg_in_range;
620 }
622 // Describe an argument out of range error
623 void Arguments::describe_range_error(ArgsRange errcode) {
624 switch(errcode) {
625 case arg_too_big:
626 jio_fprintf(defaultStream::error_stream(),
627 "The specified size exceeds the maximum "
628 "representable size.\n");
629 break;
630 case arg_too_small:
631 case arg_unreadable:
632 case arg_in_range:
633 // do nothing for now
634 break;
635 default:
636 ShouldNotReachHere();
637 }
638 }
640 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
641 return CommandLineFlags::boolAtPut(name, &value, origin);
642 }
644 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
645 double v;
646 if (sscanf(value, "%lf", &v) != 1) {
647 return false;
648 }
650 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
651 return true;
652 }
653 return false;
654 }
656 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
657 julong v;
658 intx intx_v;
659 bool is_neg = false;
660 // Check the sign first since atomull() parses only unsigned values.
661 if (*value == '-') {
662 if (!CommandLineFlags::intxAt(name, &intx_v)) {
663 return false;
664 }
665 value++;
666 is_neg = true;
667 }
668 if (!atomull(value, &v)) {
669 return false;
670 }
671 intx_v = (intx) v;
672 if (is_neg) {
673 intx_v = -intx_v;
674 }
675 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
676 return true;
677 }
678 uintx uintx_v = (uintx) v;
679 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
680 return true;
681 }
682 uint64_t uint64_t_v = (uint64_t) v;
683 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
684 return true;
685 }
686 return false;
687 }
689 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
690 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
691 // Contract: CommandLineFlags always returns a pointer that needs freeing.
692 FREE_C_HEAP_ARRAY(char, value, mtInternal);
693 return true;
694 }
696 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
697 const char* old_value = "";
698 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
699 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
700 size_t new_len = strlen(new_value);
701 const char* value;
702 char* free_this_too = NULL;
703 if (old_len == 0) {
704 value = new_value;
705 } else if (new_len == 0) {
706 value = old_value;
707 } else {
708 size_t length = old_len + 1 + new_len + 1;
709 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
710 // each new setting adds another LINE to the switch:
711 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
712 value = buf;
713 free_this_too = buf;
714 }
715 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
716 // CommandLineFlags always returns a pointer that needs freeing.
717 FREE_C_HEAP_ARRAY(char, value, mtInternal);
718 if (free_this_too != NULL) {
719 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
720 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
721 }
722 return true;
723 }
725 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
727 // range of acceptable characters spelled out for portability reasons
728 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
729 #define BUFLEN 255
730 char name[BUFLEN+1];
731 char dummy;
733 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
734 return set_bool_flag(name, false, origin);
735 }
736 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
737 return set_bool_flag(name, true, origin);
738 }
740 char punct;
741 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
742 const char* value = strchr(arg, '=') + 1;
743 Flag* flag = Flag::find_flag(name, strlen(name));
744 if (flag != NULL && flag->is_ccstr()) {
745 if (flag->ccstr_accumulates()) {
746 return append_to_string_flag(name, value, origin);
747 } else {
748 if (value[0] == '\0') {
749 value = NULL;
750 }
751 return set_string_flag(name, value, origin);
752 }
753 }
754 }
756 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
757 const char* value = strchr(arg, '=') + 1;
758 // -XX:Foo:=xxx will reset the string flag to the given value.
759 if (value[0] == '\0') {
760 value = NULL;
761 }
762 return set_string_flag(name, value, origin);
763 }
765 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
766 #define SIGNED_NUMBER_RANGE "[-0123456789]"
767 #define NUMBER_RANGE "[0123456789]"
768 char value[BUFLEN + 1];
769 char value2[BUFLEN + 1];
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
771 // Looks like a floating-point number -- try again with more lenient format string
772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
773 return set_fp_numeric_flag(name, value, origin);
774 }
775 }
777 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
778 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
779 return set_numeric_flag(name, value, origin);
780 }
782 return false;
783 }
785 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
786 assert(bldarray != NULL, "illegal argument");
788 if (arg == NULL) {
789 return;
790 }
792 int new_count = *count + 1;
794 // expand the array and add arg to the last element
795 if (*bldarray == NULL) {
796 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
797 } else {
798 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
799 }
800 (*bldarray)[*count] = strdup(arg);
801 *count = new_count;
802 }
804 void Arguments::build_jvm_args(const char* arg) {
805 add_string(&_jvm_args_array, &_num_jvm_args, arg);
806 }
808 void Arguments::build_jvm_flags(const char* arg) {
809 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
810 }
812 // utility function to return a string that concatenates all
813 // strings in a given char** array
814 const char* Arguments::build_resource_string(char** args, int count) {
815 if (args == NULL || count == 0) {
816 return NULL;
817 }
818 size_t length = 0;
819 for (int i = 0; i < count; i++) {
820 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
821 }
822 char* s = NEW_RESOURCE_ARRAY(char, length);
823 char* dst = s;
824 for (int j = 0; j < count; j++) {
825 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
826 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
827 dst += offset;
828 length -= offset;
829 }
830 return (const char*) s;
831 }
833 void Arguments::print_on(outputStream* st) {
834 st->print_cr("VM Arguments:");
835 if (num_jvm_flags() > 0) {
836 st->print("jvm_flags: "); print_jvm_flags_on(st);
837 }
838 if (num_jvm_args() > 0) {
839 st->print("jvm_args: "); print_jvm_args_on(st);
840 }
841 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
842 if (_java_class_path != NULL) {
843 char* path = _java_class_path->value();
844 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
845 }
846 st->print_cr("Launcher Type: %s", _sun_java_launcher);
847 }
849 void Arguments::print_jvm_flags_on(outputStream* st) {
850 if (_num_jvm_flags > 0) {
851 for (int i=0; i < _num_jvm_flags; i++) {
852 st->print("%s ", _jvm_flags_array[i]);
853 }
854 st->cr();
855 }
856 }
858 void Arguments::print_jvm_args_on(outputStream* st) {
859 if (_num_jvm_args > 0) {
860 for (int i=0; i < _num_jvm_args; i++) {
861 st->print("%s ", _jvm_args_array[i]);
862 }
863 st->cr();
864 }
865 }
867 bool Arguments::process_argument(const char* arg,
868 jboolean ignore_unrecognized, Flag::Flags origin) {
870 JDK_Version since = JDK_Version();
872 if (parse_argument(arg, origin) || ignore_unrecognized) {
873 return true;
874 }
876 bool has_plus_minus = (*arg == '+' || *arg == '-');
877 const char* const argname = has_plus_minus ? arg + 1 : arg;
878 if (is_newly_obsolete(arg, &since)) {
879 char version[256];
880 since.to_string(version, sizeof(version));
881 warning("ignoring option %s; support was removed in %s", argname, version);
882 return true;
883 }
885 // For locked flags, report a custom error message if available.
886 // Otherwise, report the standard unrecognized VM option.
888 size_t arg_len;
889 const char* equal_sign = strchr(argname, '=');
890 if (equal_sign == NULL) {
891 arg_len = strlen(argname);
892 } else {
893 arg_len = equal_sign - argname;
894 }
896 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
897 if (found_flag != NULL) {
898 char locked_message_buf[BUFLEN];
899 found_flag->get_locked_message(locked_message_buf, BUFLEN);
900 if (strlen(locked_message_buf) == 0) {
901 if (found_flag->is_bool() && !has_plus_minus) {
902 jio_fprintf(defaultStream::error_stream(),
903 "Missing +/- setting for VM option '%s'\n", argname);
904 } else if (!found_flag->is_bool() && has_plus_minus) {
905 jio_fprintf(defaultStream::error_stream(),
906 "Unexpected +/- setting in VM option '%s'\n", argname);
907 } else {
908 jio_fprintf(defaultStream::error_stream(),
909 "Improperly specified VM option '%s'\n", argname);
910 }
911 } else {
912 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
913 }
914 } else {
915 jio_fprintf(defaultStream::error_stream(),
916 "Unrecognized VM option '%s'\n", argname);
917 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
918 if (fuzzy_matched != NULL) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Did you mean '%s%s%s'?\n",
921 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
922 fuzzy_matched->_name,
923 (fuzzy_matched->is_bool()) ? "" : "=<value>");
924 }
925 }
927 // allow for commandline "commenting out" options like -XX:#+Verbose
928 return arg[0] == '#';
929 }
931 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
932 FILE* stream = fopen(file_name, "rb");
933 if (stream == NULL) {
934 if (should_exist) {
935 jio_fprintf(defaultStream::error_stream(),
936 "Could not open settings file %s\n", file_name);
937 return false;
938 } else {
939 return true;
940 }
941 }
943 char token[1024];
944 int pos = 0;
946 bool in_white_space = true;
947 bool in_comment = false;
948 bool in_quote = false;
949 char quote_c = 0;
950 bool result = true;
952 int c = getc(stream);
953 while(c != EOF && pos < (int)(sizeof(token)-1)) {
954 if (in_white_space) {
955 if (in_comment) {
956 if (c == '\n') in_comment = false;
957 } else {
958 if (c == '#') in_comment = true;
959 else if (!isspace(c)) {
960 in_white_space = false;
961 token[pos++] = c;
962 }
963 }
964 } else {
965 if (c == '\n' || (!in_quote && isspace(c))) {
966 // token ends at newline, or at unquoted whitespace
967 // this allows a way to include spaces in string-valued options
968 token[pos] = '\0';
969 logOption(token);
970 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
971 build_jvm_flags(token);
972 pos = 0;
973 in_white_space = true;
974 in_quote = false;
975 } else if (!in_quote && (c == '\'' || c == '"')) {
976 in_quote = true;
977 quote_c = c;
978 } else if (in_quote && (c == quote_c)) {
979 in_quote = false;
980 } else {
981 token[pos++] = c;
982 }
983 }
984 c = getc(stream);
985 }
986 if (pos > 0) {
987 token[pos] = '\0';
988 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
989 build_jvm_flags(token);
990 }
991 fclose(stream);
992 return result;
993 }
995 //=============================================================================================================
996 // Parsing of properties (-D)
998 const char* Arguments::get_property(const char* key) {
999 return PropertyList_get_value(system_properties(), key);
1000 }
1002 bool Arguments::add_property(const char* prop) {
1003 const char* eq = strchr(prop, '=');
1004 char* key;
1005 // ns must be static--its address may be stored in a SystemProperty object.
1006 const static char ns[1] = {0};
1007 char* value = (char *)ns;
1009 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1010 key = AllocateHeap(key_len + 1, mtInternal);
1011 strncpy(key, prop, key_len);
1012 key[key_len] = '\0';
1014 if (eq != NULL) {
1015 size_t value_len = strlen(prop) - key_len - 1;
1016 value = AllocateHeap(value_len + 1, mtInternal);
1017 strncpy(value, &prop[key_len + 1], value_len + 1);
1018 }
1020 if (strcmp(key, "java.compiler") == 0) {
1021 process_java_compiler_argument(value);
1022 FreeHeap(key);
1023 if (eq != NULL) {
1024 FreeHeap(value);
1025 }
1026 return true;
1027 } else if (strcmp(key, "sun.java.command") == 0) {
1028 _java_command = value;
1030 // Record value in Arguments, but let it get passed to Java.
1031 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1032 // launcher.pid property is private and is processed
1033 // in process_sun_java_launcher_properties();
1034 // the sun.java.launcher property is passed on to the java application
1035 FreeHeap(key);
1036 if (eq != NULL) {
1037 FreeHeap(value);
1038 }
1039 return true;
1040 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1041 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1042 // its value without going through the property list or making a Java call.
1043 _java_vendor_url_bug = value;
1044 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1045 PropertyList_unique_add(&_system_properties, key, value, true);
1046 return true;
1047 }
1048 // Create new property and add at the end of the list
1049 PropertyList_unique_add(&_system_properties, key, value);
1050 return true;
1051 }
1053 //===========================================================================================================
1054 // Setting int/mixed/comp mode flags
1056 void Arguments::set_mode_flags(Mode mode) {
1057 // Set up default values for all flags.
1058 // If you add a flag to any of the branches below,
1059 // add a default value for it here.
1060 set_java_compiler(false);
1061 _mode = mode;
1063 // Ensure Agent_OnLoad has the correct initial values.
1064 // This may not be the final mode; mode may change later in onload phase.
1065 PropertyList_unique_add(&_system_properties, "java.vm.info",
1066 (char*)VM_Version::vm_info_string(), false);
1068 UseInterpreter = true;
1069 UseCompiler = true;
1070 UseLoopCounter = true;
1072 #ifndef ZERO
1073 // Turn these off for mixed and comp. Leave them on for Zero.
1074 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1075 UseFastAccessorMethods = (mode == _int);
1076 }
1077 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1078 UseFastEmptyMethods = (mode == _int);
1079 }
1080 #endif
1082 // Default values may be platform/compiler dependent -
1083 // use the saved values
1084 ClipInlining = Arguments::_ClipInlining;
1085 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1086 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1087 BackgroundCompilation = Arguments::_BackgroundCompilation;
1089 // Change from defaults based on mode
1090 switch (mode) {
1091 default:
1092 ShouldNotReachHere();
1093 break;
1094 case _int:
1095 UseCompiler = false;
1096 UseLoopCounter = false;
1097 AlwaysCompileLoopMethods = false;
1098 UseOnStackReplacement = false;
1099 break;
1100 case _mixed:
1101 // same as default
1102 break;
1103 case _comp:
1104 UseInterpreter = false;
1105 BackgroundCompilation = false;
1106 ClipInlining = false;
1107 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1108 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1109 // compile a level 4 (C2) and then continue executing it.
1110 if (TieredCompilation) {
1111 Tier3InvokeNotifyFreqLog = 0;
1112 Tier4InvocationThreshold = 0;
1113 }
1114 break;
1115 }
1116 }
1118 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1119 // Conflict: required to use shared spaces (-Xshare:on), but
1120 // incompatible command line options were chosen.
1122 static void no_shared_spaces(const char* message) {
1123 if (RequireSharedSpaces) {
1124 jio_fprintf(defaultStream::error_stream(),
1125 "Class data sharing is inconsistent with other specified options.\n");
1126 vm_exit_during_initialization("Unable to use shared archive.", message);
1127 } else {
1128 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1129 }
1130 }
1131 #endif
1133 void Arguments::set_tiered_flags() {
1134 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1135 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1136 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1137 }
1138 if (CompilationPolicyChoice < 2) {
1139 vm_exit_during_initialization(
1140 "Incompatible compilation policy selected", NULL);
1141 }
1142 // Increase the code cache size - tiered compiles a lot more.
1143 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1144 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1145 }
1146 if (!UseInterpreter) { // -Xcomp
1147 Tier3InvokeNotifyFreqLog = 0;
1148 Tier4InvocationThreshold = 0;
1149 }
1150 }
1152 /**
1153 * Returns the minimum number of compiler threads needed to run the JVM. The following
1154 * configurations are possible.
1155 *
1156 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1157 * compiler threads is 0.
1158 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1159 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1160 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1161 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1162 * C1 can be used, so the minimum number of compiler threads is 1.
1163 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1164 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1165 * the minimum number of compiler threads is 2.
1166 */
1167 int Arguments::get_min_number_of_compiler_threads() {
1168 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1169 return 0; // case 1
1170 #else
1171 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1172 return 1; // case 2 or case 3
1173 }
1174 return 2; // case 4 (tiered)
1175 #endif
1176 }
1178 #if INCLUDE_ALL_GCS
1179 static void disable_adaptive_size_policy(const char* collector_name) {
1180 if (UseAdaptiveSizePolicy) {
1181 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1182 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1183 collector_name);
1184 }
1185 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1186 }
1187 }
1189 void Arguments::set_parnew_gc_flags() {
1190 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1191 "control point invariant");
1192 assert(UseParNewGC, "Error");
1194 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1195 disable_adaptive_size_policy("UseParNewGC");
1197 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1198 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1199 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1200 } else if (ParallelGCThreads == 0) {
1201 jio_fprintf(defaultStream::error_stream(),
1202 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1203 vm_exit(1);
1204 }
1206 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1207 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1208 // we set them to 1024 and 1024.
1209 // See CR 6362902.
1210 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1211 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1212 }
1213 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1214 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1215 }
1217 // AlwaysTenure flag should make ParNew promote all at first collection.
1218 // See CR 6362902.
1219 if (AlwaysTenure) {
1220 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1221 }
1222 // When using compressed oops, we use local overflow stacks,
1223 // rather than using a global overflow list chained through
1224 // the klass word of the object's pre-image.
1225 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1226 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1227 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1228 }
1229 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1230 }
1231 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1232 }
1234 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1235 // sparc/solaris for certain applications, but would gain from
1236 // further optimization and tuning efforts, and would almost
1237 // certainly gain from analysis of platform and environment.
1238 void Arguments::set_cms_and_parnew_gc_flags() {
1239 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1240 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1242 // If we are using CMS, we prefer to UseParNewGC,
1243 // unless explicitly forbidden.
1244 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1245 FLAG_SET_ERGO(bool, UseParNewGC, true);
1246 }
1248 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1249 disable_adaptive_size_policy("UseConcMarkSweepGC");
1251 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1252 // as needed.
1253 if (UseParNewGC) {
1254 set_parnew_gc_flags();
1255 }
1257 size_t max_heap = align_size_down(MaxHeapSize,
1258 CardTableRS::ct_max_alignment_constraint());
1260 // Now make adjustments for CMS
1261 intx tenuring_default = (intx)6;
1262 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1264 // Preferred young gen size for "short" pauses:
1265 // upper bound depends on # of threads and NewRatio.
1266 const uintx parallel_gc_threads =
1267 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1268 const size_t preferred_max_new_size_unaligned =
1269 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1270 size_t preferred_max_new_size =
1271 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1273 // Unless explicitly requested otherwise, size young gen
1274 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1276 // If either MaxNewSize or NewRatio is set on the command line,
1277 // assume the user is trying to set the size of the young gen.
1278 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1280 // Set MaxNewSize to our calculated preferred_max_new_size unless
1281 // NewSize was set on the command line and it is larger than
1282 // preferred_max_new_size.
1283 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1284 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1285 } else {
1286 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1287 }
1288 if (PrintGCDetails && Verbose) {
1289 // Too early to use gclog_or_tty
1290 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1291 }
1293 // Code along this path potentially sets NewSize and OldSize
1294 if (PrintGCDetails && Verbose) {
1295 // Too early to use gclog_or_tty
1296 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1297 " initial_heap_size: " SIZE_FORMAT
1298 " max_heap: " SIZE_FORMAT,
1299 min_heap_size(), InitialHeapSize, max_heap);
1300 }
1301 size_t min_new = preferred_max_new_size;
1302 if (FLAG_IS_CMDLINE(NewSize)) {
1303 min_new = NewSize;
1304 }
1305 if (max_heap > min_new && min_heap_size() > min_new) {
1306 // Unless explicitly requested otherwise, make young gen
1307 // at least min_new, and at most preferred_max_new_size.
1308 if (FLAG_IS_DEFAULT(NewSize)) {
1309 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1310 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1311 if (PrintGCDetails && Verbose) {
1312 // Too early to use gclog_or_tty
1313 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1314 }
1315 }
1316 // Unless explicitly requested otherwise, size old gen
1317 // so it's NewRatio x of NewSize.
1318 if (FLAG_IS_DEFAULT(OldSize)) {
1319 if (max_heap > NewSize) {
1320 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1321 if (PrintGCDetails && Verbose) {
1322 // Too early to use gclog_or_tty
1323 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1324 }
1325 }
1326 }
1327 }
1328 }
1329 // Unless explicitly requested otherwise, definitely
1330 // promote all objects surviving "tenuring_default" scavenges.
1331 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1332 FLAG_IS_DEFAULT(SurvivorRatio)) {
1333 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1334 }
1335 // If we decided above (or user explicitly requested)
1336 // `promote all' (via MaxTenuringThreshold := 0),
1337 // prefer minuscule survivor spaces so as not to waste
1338 // space for (non-existent) survivors
1339 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1340 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1341 }
1342 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1343 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1344 // This is done in order to make ParNew+CMS configuration to work
1345 // with YoungPLABSize and OldPLABSize options.
1346 // See CR 6362902.
1347 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1348 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1349 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1350 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1351 // the value (either from the command line or ergonomics) of
1352 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1353 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1354 } else {
1355 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1356 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1357 // we'll let it to take precedence.
1358 jio_fprintf(defaultStream::error_stream(),
1359 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1360 " options are specified for the CMS collector."
1361 " CMSParPromoteBlocksToClaim will take precedence.\n");
1362 }
1363 }
1364 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1365 // OldPLAB sizing manually turned off: Use a larger default setting,
1366 // unless it was manually specified. This is because a too-low value
1367 // will slow down scavenges.
1368 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1369 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1370 }
1371 }
1372 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1373 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1374 // If either of the static initialization defaults have changed, note this
1375 // modification.
1376 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1377 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1378 }
1380 if (!ClassUnloading) {
1381 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1382 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1383 }
1385 if (PrintGCDetails && Verbose) {
1386 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1387 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1388 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1389 }
1390 }
1391 #endif // INCLUDE_ALL_GCS
1393 void set_object_alignment() {
1394 // Object alignment.
1395 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1396 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1397 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1398 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1399 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1400 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1402 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1403 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1405 // Oop encoding heap max
1406 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1408 #if INCLUDE_ALL_GCS
1409 // Set CMS global values
1410 CompactibleFreeListSpace::set_cms_values();
1411 #endif // INCLUDE_ALL_GCS
1412 }
1414 bool verify_object_alignment() {
1415 // Object alignment.
1416 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1417 jio_fprintf(defaultStream::error_stream(),
1418 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1419 (int)ObjectAlignmentInBytes);
1420 return false;
1421 }
1422 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1423 jio_fprintf(defaultStream::error_stream(),
1424 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1425 (int)ObjectAlignmentInBytes, BytesPerLong);
1426 return false;
1427 }
1428 // It does not make sense to have big object alignment
1429 // since a space lost due to alignment will be greater
1430 // then a saved space from compressed oops.
1431 if ((int)ObjectAlignmentInBytes > 256) {
1432 jio_fprintf(defaultStream::error_stream(),
1433 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1434 (int)ObjectAlignmentInBytes);
1435 return false;
1436 }
1437 // In case page size is very small.
1438 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1439 jio_fprintf(defaultStream::error_stream(),
1440 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1441 (int)ObjectAlignmentInBytes, os::vm_page_size());
1442 return false;
1443 }
1444 if(SurvivorAlignmentInBytes == 0) {
1445 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1446 } else {
1447 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1448 jio_fprintf(defaultStream::error_stream(),
1449 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1450 (int)SurvivorAlignmentInBytes);
1451 return false;
1452 }
1453 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1454 jio_fprintf(defaultStream::error_stream(),
1455 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1456 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1457 return false;
1458 }
1459 }
1460 return true;
1461 }
1463 size_t Arguments::max_heap_for_compressed_oops() {
1464 // Avoid sign flip.
1465 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1466 // We need to fit both the NULL page and the heap into the memory budget, while
1467 // keeping alignment constraints of the heap. To guarantee the latter, as the
1468 // NULL page is located before the heap, we pad the NULL page to the conservative
1469 // maximum alignment that the GC may ever impose upon the heap.
1470 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1471 _conservative_max_heap_alignment);
1473 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1474 NOT_LP64(ShouldNotReachHere(); return 0);
1475 }
1477 bool Arguments::should_auto_select_low_pause_collector() {
1478 if (UseAutoGCSelectPolicy &&
1479 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1480 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1481 if (PrintGCDetails) {
1482 // Cannot use gclog_or_tty yet.
1483 tty->print_cr("Automatic selection of the low pause collector"
1484 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1485 }
1486 return true;
1487 }
1488 return false;
1489 }
1491 void Arguments::set_use_compressed_oops() {
1492 #ifndef ZERO
1493 #ifdef _LP64
1494 // MaxHeapSize is not set up properly at this point, but
1495 // the only value that can override MaxHeapSize if we are
1496 // to use UseCompressedOops is InitialHeapSize.
1497 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1499 if (max_heap_size <= max_heap_for_compressed_oops()) {
1500 #if !defined(COMPILER1) || defined(TIERED)
1501 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1502 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1503 }
1504 #endif
1505 #ifdef _WIN64
1506 if (UseLargePages && UseCompressedOops) {
1507 // Cannot allocate guard pages for implicit checks in indexed addressing
1508 // mode, when large pages are specified on windows.
1509 // This flag could be switched ON if narrow oop base address is set to 0,
1510 // see code in Universe::initialize_heap().
1511 Universe::set_narrow_oop_use_implicit_null_checks(false);
1512 }
1513 #endif // _WIN64
1514 } else {
1515 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1516 warning("Max heap size too large for Compressed Oops");
1517 FLAG_SET_DEFAULT(UseCompressedOops, false);
1518 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1519 }
1520 }
1521 #endif // _LP64
1522 #endif // ZERO
1523 }
1526 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1527 // set_use_compressed_oops().
1528 void Arguments::set_use_compressed_klass_ptrs() {
1529 #ifndef ZERO
1530 #ifdef _LP64
1531 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1532 if (!UseCompressedOops) {
1533 if (UseCompressedClassPointers) {
1534 warning("UseCompressedClassPointers requires UseCompressedOops");
1535 }
1536 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1537 } else {
1538 // Turn on UseCompressedClassPointers too
1539 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1540 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1541 }
1542 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1543 if (UseCompressedClassPointers) {
1544 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1545 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1546 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1547 }
1548 }
1549 }
1550 #endif // _LP64
1551 #endif // !ZERO
1552 }
1554 void Arguments::set_conservative_max_heap_alignment() {
1555 // The conservative maximum required alignment for the heap is the maximum of
1556 // the alignments imposed by several sources: any requirements from the heap
1557 // itself, the collector policy and the maximum page size we may run the VM
1558 // with.
1559 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1560 #if INCLUDE_ALL_GCS
1561 if (UseParallelGC) {
1562 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1563 } else if (UseG1GC) {
1564 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1565 }
1566 #endif // INCLUDE_ALL_GCS
1567 _conservative_max_heap_alignment = MAX4(heap_alignment,
1568 (size_t)os::vm_allocation_granularity(),
1569 os::max_page_size(),
1570 CollectorPolicy::compute_heap_alignment());
1571 }
1573 void Arguments::select_gc_ergonomically() {
1574 if (os::is_server_class_machine()) {
1575 if (should_auto_select_low_pause_collector()) {
1576 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1577 } else {
1578 FLAG_SET_ERGO(bool, UseParallelGC, true);
1579 }
1580 }
1581 }
1583 void Arguments::select_gc() {
1584 if (!gc_selected()) {
1585 select_gc_ergonomically();
1586 }
1587 }
1589 void Arguments::set_ergonomics_flags() {
1590 select_gc();
1592 #ifdef COMPILER2
1593 // Shared spaces work fine with other GCs but causes bytecode rewriting
1594 // to be disabled, which hurts interpreter performance and decreases
1595 // server performance. When -server is specified, keep the default off
1596 // unless it is asked for. Future work: either add bytecode rewriting
1597 // at link time, or rewrite bytecodes in non-shared methods.
1598 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1599 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1600 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1601 }
1602 #endif
1604 set_conservative_max_heap_alignment();
1606 #ifndef ZERO
1607 #ifdef _LP64
1608 set_use_compressed_oops();
1610 // set_use_compressed_klass_ptrs() must be called after calling
1611 // set_use_compressed_oops().
1612 set_use_compressed_klass_ptrs();
1614 // Also checks that certain machines are slower with compressed oops
1615 // in vm_version initialization code.
1616 #endif // _LP64
1617 #endif // !ZERO
1618 }
1620 void Arguments::set_parallel_gc_flags() {
1621 assert(UseParallelGC || UseParallelOldGC, "Error");
1622 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1623 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1624 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1625 }
1626 FLAG_SET_DEFAULT(UseParallelGC, true);
1628 // If no heap maximum was requested explicitly, use some reasonable fraction
1629 // of the physical memory, up to a maximum of 1GB.
1630 FLAG_SET_DEFAULT(ParallelGCThreads,
1631 Abstract_VM_Version::parallel_worker_threads());
1632 if (ParallelGCThreads == 0) {
1633 jio_fprintf(defaultStream::error_stream(),
1634 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1635 vm_exit(1);
1636 }
1638 if (UseAdaptiveSizePolicy) {
1639 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1640 // unless the user actually sets these flags.
1641 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1642 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1643 _min_heap_free_ratio = MinHeapFreeRatio;
1644 }
1645 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1646 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1647 _max_heap_free_ratio = MaxHeapFreeRatio;
1648 }
1649 }
1651 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1652 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1653 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1654 // See CR 6362902 for details.
1655 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1656 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1657 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1658 }
1659 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1660 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1661 }
1662 }
1664 if (UseParallelOldGC) {
1665 // Par compact uses lower default values since they are treated as
1666 // minimums. These are different defaults because of the different
1667 // interpretation and are not ergonomically set.
1668 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1669 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1670 }
1671 }
1672 }
1674 void Arguments::set_g1_gc_flags() {
1675 assert(UseG1GC, "Error");
1676 #ifdef COMPILER1
1677 FastTLABRefill = false;
1678 #endif
1679 FLAG_SET_DEFAULT(ParallelGCThreads,
1680 Abstract_VM_Version::parallel_worker_threads());
1681 if (ParallelGCThreads == 0) {
1682 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1683 }
1685 #if INCLUDE_ALL_GCS
1686 if (G1ConcRefinementThreads == 0) {
1687 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1688 }
1689 #endif
1691 // MarkStackSize will be set (if it hasn't been set by the user)
1692 // when concurrent marking is initialized.
1693 // Its value will be based upon the number of parallel marking threads.
1694 // But we do set the maximum mark stack size here.
1695 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1696 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1697 }
1699 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1700 // In G1, we want the default GC overhead goal to be higher than
1701 // say in PS. So we set it here to 10%. Otherwise the heap might
1702 // be expanded more aggressively than we would like it to. In
1703 // fact, even 10% seems to not be high enough in some cases
1704 // (especially small GC stress tests that the main thing they do
1705 // is allocation). We might consider increase it further.
1706 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1707 }
1709 if (PrintGCDetails && Verbose) {
1710 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1711 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1712 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1713 }
1714 }
1716 #if !INCLUDE_ALL_GCS
1717 #ifdef ASSERT
1718 static bool verify_serial_gc_flags() {
1719 return (UseSerialGC &&
1720 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1721 UseParallelGC || UseParallelOldGC));
1722 }
1723 #endif // ASSERT
1724 #endif // INCLUDE_ALL_GCS
1726 void Arguments::set_gc_specific_flags() {
1727 #if INCLUDE_ALL_GCS
1728 // Set per-collector flags
1729 if (UseParallelGC || UseParallelOldGC) {
1730 set_parallel_gc_flags();
1731 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1732 set_cms_and_parnew_gc_flags();
1733 } else if (UseParNewGC) { // Skipped if CMS is set above
1734 set_parnew_gc_flags();
1735 } else if (UseG1GC) {
1736 set_g1_gc_flags();
1737 }
1738 check_deprecated_gcs();
1739 check_deprecated_gc_flags();
1740 if (AssumeMP && !UseSerialGC) {
1741 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1742 warning("If the number of processors is expected to increase from one, then"
1743 " you should configure the number of parallel GC threads appropriately"
1744 " using -XX:ParallelGCThreads=N");
1745 }
1746 }
1747 if (MinHeapFreeRatio == 100) {
1748 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1749 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1750 }
1751 #else // INCLUDE_ALL_GCS
1752 assert(verify_serial_gc_flags(), "SerialGC unset");
1753 #endif // INCLUDE_ALL_GCS
1754 }
1756 julong Arguments::limit_by_allocatable_memory(julong limit) {
1757 julong max_allocatable;
1758 julong result = limit;
1759 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1760 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1761 }
1762 return result;
1763 }
1765 void Arguments::set_heap_size() {
1766 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1767 // Deprecated flag
1768 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1769 }
1771 julong phys_mem =
1772 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1773 : (julong)MaxRAM;
1775 // Experimental support for CGroup memory limits
1776 if (UseCGroupMemoryLimitForHeap) {
1777 // This is a rough indicator that a CGroup limit may be in force
1778 // for this process
1779 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1780 FILE *fp = fopen(lim_file, "r");
1781 if (fp != NULL) {
1782 julong cgroup_max = 0;
1783 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1784 if (ret == 1 && cgroup_max > 0) {
1785 // If unlimited, cgroup_max will be a very large, but unspecified
1786 // value, so use initial phys_mem as a limit
1787 if (PrintGCDetails && Verbose) {
1788 // Cannot use gclog_or_tty yet.
1789 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1790 JULONG_FORMAT "MB) and initial phys_mem ("
1791 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1792 }
1793 phys_mem = MIN2(cgroup_max, phys_mem);
1794 } else {
1795 warning("Unable to read/parse cgroup memory limit from %s: %s",
1796 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1797 }
1798 fclose(fp);
1799 } else {
1800 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1801 }
1802 }
1804 // If the maximum heap size has not been set with -Xmx,
1805 // then set it as fraction of the size of physical memory,
1806 // respecting the maximum and minimum sizes of the heap.
1807 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1808 julong reasonable_max = phys_mem / MaxRAMFraction;
1810 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1811 // Small physical memory, so use a minimum fraction of it for the heap
1812 reasonable_max = phys_mem / MinRAMFraction;
1813 } else {
1814 // Not-small physical memory, so require a heap at least
1815 // as large as MaxHeapSize
1816 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1817 }
1818 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1819 // Limit the heap size to ErgoHeapSizeLimit
1820 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1821 }
1822 if (UseCompressedOops) {
1823 // Limit the heap size to the maximum possible when using compressed oops
1824 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1825 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1826 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1827 // but it should be not less than default MaxHeapSize.
1828 max_coop_heap -= HeapBaseMinAddress;
1829 }
1830 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1831 }
1832 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1834 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1835 // An initial heap size was specified on the command line,
1836 // so be sure that the maximum size is consistent. Done
1837 // after call to limit_by_allocatable_memory because that
1838 // method might reduce the allocation size.
1839 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1840 }
1842 if (PrintGCDetails && Verbose) {
1843 // Cannot use gclog_or_tty yet.
1844 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1845 }
1846 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1847 }
1849 // If the minimum or initial heap_size have not been set or requested to be set
1850 // ergonomically, set them accordingly.
1851 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1852 julong reasonable_minimum = (julong)(OldSize + NewSize);
1854 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1856 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1858 if (InitialHeapSize == 0) {
1859 julong reasonable_initial = phys_mem / InitialRAMFraction;
1861 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1862 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1864 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1866 if (PrintGCDetails && Verbose) {
1867 // Cannot use gclog_or_tty yet.
1868 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1869 }
1870 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1871 }
1872 // If the minimum heap size has not been set (via -Xms),
1873 // synchronize with InitialHeapSize to avoid errors with the default value.
1874 if (min_heap_size() == 0) {
1875 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1876 if (PrintGCDetails && Verbose) {
1877 // Cannot use gclog_or_tty yet.
1878 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1879 }
1880 }
1881 }
1882 }
1884 // This must be called after ergonomics because we want bytecode rewriting
1885 // if the server compiler is used, or if UseSharedSpaces is disabled.
1886 void Arguments::set_bytecode_flags() {
1887 // Better not attempt to store into a read-only space.
1888 if (UseSharedSpaces) {
1889 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1890 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1891 }
1893 if (!RewriteBytecodes) {
1894 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1895 }
1896 }
1898 // Aggressive optimization flags -XX:+AggressiveOpts
1899 void Arguments::set_aggressive_opts_flags() {
1900 #ifdef COMPILER2
1901 if (AggressiveUnboxing) {
1902 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1903 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1904 } else if (!EliminateAutoBox) {
1905 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1906 AggressiveUnboxing = false;
1907 }
1908 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1909 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1910 } else if (!DoEscapeAnalysis) {
1911 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1912 AggressiveUnboxing = false;
1913 }
1914 }
1915 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1916 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1917 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1918 }
1919 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1920 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1921 }
1923 // Feed the cache size setting into the JDK
1924 char buffer[1024];
1925 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1926 add_property(buffer);
1927 }
1928 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1929 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1930 }
1931 #endif
1933 if (AggressiveOpts) {
1934 // Sample flag setting code
1935 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1936 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1937 // }
1938 }
1939 }
1941 //===========================================================================================================
1942 // Parsing of java.compiler property
1944 void Arguments::process_java_compiler_argument(char* arg) {
1945 // For backwards compatibility, Djava.compiler=NONE or ""
1946 // causes us to switch to -Xint mode UNLESS -Xdebug
1947 // is also specified.
1948 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1949 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1950 }
1951 }
1953 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1954 _sun_java_launcher = strdup(launcher);
1955 if (strcmp("gamma", _sun_java_launcher) == 0) {
1956 _created_by_gamma_launcher = true;
1957 }
1958 }
1960 bool Arguments::created_by_java_launcher() {
1961 assert(_sun_java_launcher != NULL, "property must have value");
1962 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1963 }
1965 bool Arguments::created_by_gamma_launcher() {
1966 return _created_by_gamma_launcher;
1967 }
1969 //===========================================================================================================
1970 // Parsing of main arguments
1972 bool Arguments::verify_interval(uintx val, uintx min,
1973 uintx max, const char* name) {
1974 // Returns true iff value is in the inclusive interval [min..max]
1975 // false, otherwise.
1976 if (val >= min && val <= max) {
1977 return true;
1978 }
1979 jio_fprintf(defaultStream::error_stream(),
1980 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1981 " and " UINTX_FORMAT "\n",
1982 name, val, min, max);
1983 return false;
1984 }
1986 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1987 // Returns true if given value is at least specified min threshold
1988 // false, otherwise.
1989 if (val >= min ) {
1990 return true;
1991 }
1992 jio_fprintf(defaultStream::error_stream(),
1993 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1994 name, val, min);
1995 return false;
1996 }
1998 bool Arguments::verify_percentage(uintx value, const char* name) {
1999 if (is_percentage(value)) {
2000 return true;
2001 }
2002 jio_fprintf(defaultStream::error_stream(),
2003 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2004 name, value);
2005 return false;
2006 }
2008 // check if do gclog rotation
2009 // +UseGCLogFileRotation is a must,
2010 // no gc log rotation when log file not supplied or
2011 // NumberOfGCLogFiles is 0
2012 void check_gclog_consistency() {
2013 if (UseGCLogFileRotation) {
2014 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2015 jio_fprintf(defaultStream::output_stream(),
2016 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2017 "where num_of_file > 0\n"
2018 "GC log rotation is turned off\n");
2019 UseGCLogFileRotation = false;
2020 }
2021 }
2023 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2024 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2025 jio_fprintf(defaultStream::output_stream(),
2026 "GCLogFileSize changed to minimum 8K\n");
2027 }
2028 }
2030 // This function is called for -Xloggc:<filename>, it can be used
2031 // to check if a given file name(or string) conforms to the following
2032 // specification:
2033 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2034 // %p and %t only allowed once. We only limit usage of filename not path
2035 bool is_filename_valid(const char *file_name) {
2036 const char* p = file_name;
2037 char file_sep = os::file_separator()[0];
2038 const char* cp;
2039 // skip prefix path
2040 for (cp = file_name; *cp != '\0'; cp++) {
2041 if (*cp == '/' || *cp == file_sep) {
2042 p = cp + 1;
2043 }
2044 }
2046 int count_p = 0;
2047 int count_t = 0;
2048 while (*p != '\0') {
2049 if ((*p >= '0' && *p <= '9') ||
2050 (*p >= 'A' && *p <= 'Z') ||
2051 (*p >= 'a' && *p <= 'z') ||
2052 *p == '-' ||
2053 *p == '_' ||
2054 *p == '.') {
2055 p++;
2056 continue;
2057 }
2058 if (*p == '%') {
2059 if(*(p + 1) == 'p') {
2060 p += 2;
2061 count_p ++;
2062 continue;
2063 }
2064 if (*(p + 1) == 't') {
2065 p += 2;
2066 count_t ++;
2067 continue;
2068 }
2069 }
2070 return false;
2071 }
2072 return count_p < 2 && count_t < 2;
2073 }
2075 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2076 if (!is_percentage(min_heap_free_ratio)) {
2077 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2078 return false;
2079 }
2080 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2081 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2082 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2083 MaxHeapFreeRatio);
2084 return false;
2085 }
2086 // This does not set the flag itself, but stores the value in a safe place for later usage.
2087 _min_heap_free_ratio = min_heap_free_ratio;
2088 return true;
2089 }
2091 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2092 if (!is_percentage(max_heap_free_ratio)) {
2093 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2094 return false;
2095 }
2096 if (max_heap_free_ratio < MinHeapFreeRatio) {
2097 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2098 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2099 MinHeapFreeRatio);
2100 return false;
2101 }
2102 // This does not set the flag itself, but stores the value in a safe place for later usage.
2103 _max_heap_free_ratio = max_heap_free_ratio;
2104 return true;
2105 }
2107 // Check consistency of GC selection
2108 bool Arguments::check_gc_consistency() {
2109 check_gclog_consistency();
2110 bool status = true;
2111 // Ensure that the user has not selected conflicting sets
2112 // of collectors. [Note: this check is merely a user convenience;
2113 // collectors over-ride each other so that only a non-conflicting
2114 // set is selected; however what the user gets is not what they
2115 // may have expected from the combination they asked for. It's
2116 // better to reduce user confusion by not allowing them to
2117 // select conflicting combinations.
2118 uint i = 0;
2119 if (UseSerialGC) i++;
2120 if (UseConcMarkSweepGC || UseParNewGC) i++;
2121 if (UseParallelGC || UseParallelOldGC) i++;
2122 if (UseG1GC) i++;
2123 if (i > 1) {
2124 jio_fprintf(defaultStream::error_stream(),
2125 "Conflicting collector combinations in option list; "
2126 "please refer to the release notes for the combinations "
2127 "allowed\n");
2128 status = false;
2129 }
2130 return status;
2131 }
2133 void Arguments::check_deprecated_gcs() {
2134 if (UseConcMarkSweepGC && !UseParNewGC) {
2135 warning("Using the DefNew young collector with the CMS collector is deprecated "
2136 "and will likely be removed in a future release");
2137 }
2139 if (UseParNewGC && !UseConcMarkSweepGC) {
2140 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2141 // set up UseSerialGC properly, so that can't be used in the check here.
2142 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2143 "and will likely be removed in a future release");
2144 }
2146 if (CMSIncrementalMode) {
2147 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2148 }
2149 }
2151 void Arguments::check_deprecated_gc_flags() {
2152 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2153 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2154 "and will likely be removed in future release");
2155 }
2156 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2157 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2158 "Use MaxRAMFraction instead.");
2159 }
2160 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2161 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2162 }
2163 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2164 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2165 }
2166 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2167 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2168 }
2169 }
2171 // Check stack pages settings
2172 bool Arguments::check_stack_pages()
2173 {
2174 bool status = true;
2175 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2176 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2177 // greater stack shadow pages can't generate instruction to bang stack
2178 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2179 return status;
2180 }
2182 // Check the consistency of vm_init_args
2183 bool Arguments::check_vm_args_consistency() {
2184 // Method for adding checks for flag consistency.
2185 // The intent is to warn the user of all possible conflicts,
2186 // before returning an error.
2187 // Note: Needs platform-dependent factoring.
2188 bool status = true;
2190 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2191 // builds so the cost of stack banging can be measured.
2192 #if (defined(PRODUCT) && defined(SOLARIS))
2193 if (!UseBoundThreads && !UseStackBanging) {
2194 jio_fprintf(defaultStream::error_stream(),
2195 "-UseStackBanging conflicts with -UseBoundThreads\n");
2197 status = false;
2198 }
2199 #endif
2201 if (TLABRefillWasteFraction == 0) {
2202 jio_fprintf(defaultStream::error_stream(),
2203 "TLABRefillWasteFraction should be a denominator, "
2204 "not " SIZE_FORMAT "\n",
2205 TLABRefillWasteFraction);
2206 status = false;
2207 }
2209 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2210 "AdaptiveSizePolicyWeight");
2211 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2213 // Divide by bucket size to prevent a large size from causing rollover when
2214 // calculating amount of memory needed to be allocated for the String table.
2215 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2216 (max_uintx / StringTable::bucket_size()), "StringTable size");
2218 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2219 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2221 {
2222 // Using "else if" below to avoid printing two error messages if min > max.
2223 // This will also prevent us from reporting both min>100 and max>100 at the
2224 // same time, but that is less annoying than printing two identical errors IMHO.
2225 FormatBuffer<80> err_msg("%s","");
2226 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2227 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2228 status = false;
2229 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2230 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2231 status = false;
2232 }
2233 }
2235 // Min/MaxMetaspaceFreeRatio
2236 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2237 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2239 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2240 jio_fprintf(defaultStream::error_stream(),
2241 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2242 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2243 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2244 MinMetaspaceFreeRatio,
2245 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2246 MaxMetaspaceFreeRatio);
2247 status = false;
2248 }
2250 // Trying to keep 100% free is not practical
2251 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2253 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2254 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2255 }
2257 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2258 // Settings to encourage splitting.
2259 if (!FLAG_IS_CMDLINE(NewRatio)) {
2260 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2261 }
2262 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2263 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2264 }
2265 }
2267 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2268 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2269 if (GCTimeLimit == 100) {
2270 // Turn off gc-overhead-limit-exceeded checks
2271 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2272 }
2274 status = status && check_gc_consistency();
2275 status = status && check_stack_pages();
2277 if (CMSIncrementalMode) {
2278 if (!UseConcMarkSweepGC) {
2279 jio_fprintf(defaultStream::error_stream(),
2280 "error: invalid argument combination.\n"
2281 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2282 "selected in order\nto use CMSIncrementalMode.\n");
2283 status = false;
2284 } else {
2285 status = status && verify_percentage(CMSIncrementalDutyCycle,
2286 "CMSIncrementalDutyCycle");
2287 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2288 "CMSIncrementalDutyCycleMin");
2289 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2290 "CMSIncrementalSafetyFactor");
2291 status = status && verify_percentage(CMSIncrementalOffset,
2292 "CMSIncrementalOffset");
2293 status = status && verify_percentage(CMSExpAvgFactor,
2294 "CMSExpAvgFactor");
2295 // If it was not set on the command line, set
2296 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2297 if (CMSInitiatingOccupancyFraction < 0) {
2298 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2299 }
2300 }
2301 }
2303 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2304 // insists that we hold the requisite locks so that the iteration is
2305 // MT-safe. For the verification at start-up and shut-down, we don't
2306 // yet have a good way of acquiring and releasing these locks,
2307 // which are not visible at the CollectedHeap level. We want to
2308 // be able to acquire these locks and then do the iteration rather
2309 // than just disable the lock verification. This will be fixed under
2310 // bug 4788986.
2311 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2312 if (VerifyDuringStartup) {
2313 warning("Heap verification at start-up disabled "
2314 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2315 VerifyDuringStartup = false; // Disable verification at start-up
2316 }
2318 if (VerifyBeforeExit) {
2319 warning("Heap verification at shutdown disabled "
2320 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2321 VerifyBeforeExit = false; // Disable verification at shutdown
2322 }
2323 }
2325 // Note: only executed in non-PRODUCT mode
2326 if (!UseAsyncConcMarkSweepGC &&
2327 (ExplicitGCInvokesConcurrent ||
2328 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2329 jio_fprintf(defaultStream::error_stream(),
2330 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2331 " with -UseAsyncConcMarkSweepGC");
2332 status = false;
2333 }
2335 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2337 #if INCLUDE_ALL_GCS
2338 if (UseG1GC) {
2339 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2340 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2341 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2343 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2344 "InitiatingHeapOccupancyPercent");
2345 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2346 "G1RefProcDrainInterval");
2347 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2348 "G1ConcMarkStepDurationMillis");
2349 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2350 "G1ConcRSHotCardLimit");
2351 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2352 "G1ConcRSLogCacheSize");
2353 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2354 "StringDeduplicationAgeThreshold");
2355 }
2356 if (UseConcMarkSweepGC) {
2357 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2358 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2359 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2360 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2362 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2364 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2365 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2366 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2368 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2370 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2371 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2373 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2374 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2375 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2377 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2379 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2381 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2382 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2383 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2384 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2385 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2386 }
2388 if (UseParallelGC || UseParallelOldGC) {
2389 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2390 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2392 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2393 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2395 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2396 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2398 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2400 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2401 }
2402 #endif // INCLUDE_ALL_GCS
2404 status = status && verify_interval(RefDiscoveryPolicy,
2405 ReferenceProcessor::DiscoveryPolicyMin,
2406 ReferenceProcessor::DiscoveryPolicyMax,
2407 "RefDiscoveryPolicy");
2409 // Limit the lower bound of this flag to 1 as it is used in a division
2410 // expression.
2411 status = status && verify_interval(TLABWasteTargetPercent,
2412 1, 100, "TLABWasteTargetPercent");
2414 status = status && verify_object_alignment();
2416 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2417 "CompressedClassSpaceSize");
2419 status = status && verify_interval(MarkStackSizeMax,
2420 1, (max_jint - 1), "MarkStackSizeMax");
2421 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2423 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2425 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2427 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2429 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2430 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2432 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2434 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2435 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2436 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2437 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2439 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2440 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2442 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2443 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2444 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2446 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2447 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2449 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2450 // just for that, so hardcode here.
2451 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2452 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2453 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2454 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2456 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2457 #ifdef COMPILER1
2458 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2459 #endif
2461 if (PrintNMTStatistics) {
2462 #if INCLUDE_NMT
2463 if (MemTracker::tracking_level() == NMT_off) {
2464 #endif // INCLUDE_NMT
2465 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2466 PrintNMTStatistics = false;
2467 #if INCLUDE_NMT
2468 }
2469 #endif
2470 }
2472 // Need to limit the extent of the padding to reasonable size.
2473 // 8K is well beyond the reasonable HW cache line size, even with the
2474 // aggressive prefetching, while still leaving the room for segregating
2475 // among the distinct pages.
2476 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2479 ContendedPaddingWidth, 0, 8192);
2480 status = false;
2481 }
2483 // Need to enforce the padding not to break the existing field alignments.
2484 // It is sufficient to check against the largest type size.
2485 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2488 ContendedPaddingWidth, BytesPerLong);
2489 status = false;
2490 }
2492 // Check lower bounds of the code cache
2493 // Template Interpreter code is approximately 3X larger in debug builds.
2494 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2495 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2496 jio_fprintf(defaultStream::error_stream(),
2497 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2498 os::vm_page_size()/K);
2499 status = false;
2500 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2501 jio_fprintf(defaultStream::error_stream(),
2502 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2503 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2504 status = false;
2505 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2508 min_code_cache_size/K);
2509 status = false;
2510 } else if (ReservedCodeCacheSize > 2*G) {
2511 // Code cache size larger than MAXINT is not supported.
2512 jio_fprintf(defaultStream::error_stream(),
2513 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2514 (2*G)/M);
2515 status = false;
2516 }
2518 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2519 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2521 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2522 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2523 }
2525 #ifdef COMPILER1
2526 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2527 #endif
2529 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2530 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2531 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2532 // Check the minimum number of compiler threads
2533 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2535 return status;
2536 }
2538 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2539 const char* option_type) {
2540 if (ignore) return false;
2542 const char* spacer = " ";
2543 if (option_type == NULL) {
2544 option_type = ++spacer; // Set both to the empty string.
2545 }
2547 if (os::obsolete_option(option)) {
2548 jio_fprintf(defaultStream::error_stream(),
2549 "Obsolete %s%soption: %s\n", option_type, spacer,
2550 option->optionString);
2551 return false;
2552 } else {
2553 jio_fprintf(defaultStream::error_stream(),
2554 "Unrecognized %s%soption: %s\n", option_type, spacer,
2555 option->optionString);
2556 return true;
2557 }
2558 }
2560 static const char* user_assertion_options[] = {
2561 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2562 };
2564 static const char* system_assertion_options[] = {
2565 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2566 };
2568 // Return true if any of the strings in null-terminated array 'names' matches.
2569 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2570 // the option must match exactly.
2571 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2572 bool tail_allowed) {
2573 for (/* empty */; *names != NULL; ++names) {
2574 if (match_option(option, *names, tail)) {
2575 if (**tail == '\0' || tail_allowed && **tail == ':') {
2576 return true;
2577 }
2578 }
2579 }
2580 return false;
2581 }
2583 bool Arguments::parse_uintx(const char* value,
2584 uintx* uintx_arg,
2585 uintx min_size) {
2587 // Check the sign first since atomull() parses only unsigned values.
2588 bool value_is_positive = !(*value == '-');
2590 if (value_is_positive) {
2591 julong n;
2592 bool good_return = atomull(value, &n);
2593 if (good_return) {
2594 bool above_minimum = n >= min_size;
2595 bool value_is_too_large = n > max_uintx;
2597 if (above_minimum && !value_is_too_large) {
2598 *uintx_arg = n;
2599 return true;
2600 }
2601 }
2602 }
2603 return false;
2604 }
2606 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2607 julong* long_arg,
2608 julong min_size) {
2609 if (!atomull(s, long_arg)) return arg_unreadable;
2610 return check_memory_size(*long_arg, min_size);
2611 }
2613 // Parse JavaVMInitArgs structure
2615 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2616 // For components of the system classpath.
2617 SysClassPath scp(Arguments::get_sysclasspath());
2618 bool scp_assembly_required = false;
2620 // Save default settings for some mode flags
2621 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2622 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2623 Arguments::_ClipInlining = ClipInlining;
2624 Arguments::_BackgroundCompilation = BackgroundCompilation;
2626 // Setup flags for mixed which is the default
2627 set_mode_flags(_mixed);
2629 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2630 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2631 if (result != JNI_OK) {
2632 return result;
2633 }
2635 // Parse JavaVMInitArgs structure passed in
2636 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2637 if (result != JNI_OK) {
2638 return result;
2639 }
2641 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2642 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2643 if (result != JNI_OK) {
2644 return result;
2645 }
2647 // Do final processing now that all arguments have been parsed
2648 result = finalize_vm_init_args(&scp, scp_assembly_required);
2649 if (result != JNI_OK) {
2650 return result;
2651 }
2653 return JNI_OK;
2654 }
2656 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2657 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2658 // are dealing with -agentpath (case where name is a path), otherwise with
2659 // -agentlib
2660 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2661 char *_name;
2662 const char *_hprof = "hprof", *_jdwp = "jdwp";
2663 size_t _len_hprof, _len_jdwp, _len_prefix;
2665 if (is_path) {
2666 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2667 return false;
2668 }
2670 _name++; // skip past last path separator
2671 _len_prefix = strlen(JNI_LIB_PREFIX);
2673 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2674 return false;
2675 }
2677 _name += _len_prefix;
2678 _len_hprof = strlen(_hprof);
2679 _len_jdwp = strlen(_jdwp);
2681 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2682 _name += _len_hprof;
2683 }
2684 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2685 _name += _len_jdwp;
2686 }
2687 else {
2688 return false;
2689 }
2691 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2692 return false;
2693 }
2695 return true;
2696 }
2698 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2699 return true;
2700 }
2702 return false;
2703 }
2705 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2706 SysClassPath* scp_p,
2707 bool* scp_assembly_required_p,
2708 Flag::Flags origin) {
2709 // Remaining part of option string
2710 const char* tail;
2712 // iterate over arguments
2713 for (int index = 0; index < args->nOptions; index++) {
2714 bool is_absolute_path = false; // for -agentpath vs -agentlib
2716 const JavaVMOption* option = args->options + index;
2718 if (!match_option(option, "-Djava.class.path", &tail) &&
2719 !match_option(option, "-Dsun.java.command", &tail) &&
2720 !match_option(option, "-Dsun.java.launcher", &tail)) {
2722 // add all jvm options to the jvm_args string. This string
2723 // is used later to set the java.vm.args PerfData string constant.
2724 // the -Djava.class.path and the -Dsun.java.command options are
2725 // omitted from jvm_args string as each have their own PerfData
2726 // string constant object.
2727 build_jvm_args(option->optionString);
2728 }
2730 // -verbose:[class/gc/jni]
2731 if (match_option(option, "-verbose", &tail)) {
2732 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2733 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2734 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2735 } else if (!strcmp(tail, ":gc")) {
2736 FLAG_SET_CMDLINE(bool, PrintGC, true);
2737 } else if (!strcmp(tail, ":jni")) {
2738 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2739 }
2740 // -da / -ea / -disableassertions / -enableassertions
2741 // These accept an optional class/package name separated by a colon, e.g.,
2742 // -da:java.lang.Thread.
2743 } else if (match_option(option, user_assertion_options, &tail, true)) {
2744 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2745 if (*tail == '\0') {
2746 JavaAssertions::setUserClassDefault(enable);
2747 } else {
2748 assert(*tail == ':', "bogus match by match_option()");
2749 JavaAssertions::addOption(tail + 1, enable);
2750 }
2751 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2752 } else if (match_option(option, system_assertion_options, &tail, false)) {
2753 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2754 JavaAssertions::setSystemClassDefault(enable);
2755 // -bootclasspath:
2756 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2757 scp_p->reset_path(tail);
2758 *scp_assembly_required_p = true;
2759 // -bootclasspath/a:
2760 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2761 scp_p->add_suffix(tail);
2762 *scp_assembly_required_p = true;
2763 // -bootclasspath/p:
2764 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2765 scp_p->add_prefix(tail);
2766 *scp_assembly_required_p = true;
2767 // -Xrun
2768 } else if (match_option(option, "-Xrun", &tail)) {
2769 if (tail != NULL) {
2770 const char* pos = strchr(tail, ':');
2771 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2772 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2773 name[len] = '\0';
2775 char *options = NULL;
2776 if(pos != NULL) {
2777 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2778 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2779 }
2780 #if !INCLUDE_JVMTI
2781 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Profiling and debugging agents are not supported in this VM\n");
2784 return JNI_ERR;
2785 }
2786 #endif // !INCLUDE_JVMTI
2787 add_init_library(name, options);
2788 }
2789 // -agentlib and -agentpath
2790 } else if (match_option(option, "-agentlib:", &tail) ||
2791 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2792 if(tail != NULL) {
2793 const char* pos = strchr(tail, '=');
2794 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2795 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2796 name[len] = '\0';
2798 char *options = NULL;
2799 if(pos != NULL) {
2800 size_t length = strlen(pos + 1) + 1;
2801 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2802 jio_snprintf(options, length, "%s", pos + 1);
2803 }
2804 #if !INCLUDE_JVMTI
2805 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2806 jio_fprintf(defaultStream::error_stream(),
2807 "Profiling and debugging agents are not supported in this VM\n");
2808 return JNI_ERR;
2809 }
2810 #endif // !INCLUDE_JVMTI
2811 add_init_agent(name, options, is_absolute_path);
2812 }
2813 // -javaagent
2814 } else if (match_option(option, "-javaagent:", &tail)) {
2815 #if !INCLUDE_JVMTI
2816 jio_fprintf(defaultStream::error_stream(),
2817 "Instrumentation agents are not supported in this VM\n");
2818 return JNI_ERR;
2819 #else
2820 if(tail != NULL) {
2821 size_t length = strlen(tail) + 1;
2822 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2823 jio_snprintf(options, length, "%s", tail);
2824 add_init_agent("instrument", options, false);
2825 }
2826 #endif // !INCLUDE_JVMTI
2827 // -Xnoclassgc
2828 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2829 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2830 // -Xincgc: i-CMS
2831 } else if (match_option(option, "-Xincgc", &tail)) {
2832 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2833 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2834 // -Xnoincgc: no i-CMS
2835 } else if (match_option(option, "-Xnoincgc", &tail)) {
2836 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2837 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2838 // -Xconcgc
2839 } else if (match_option(option, "-Xconcgc", &tail)) {
2840 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2841 // -Xnoconcgc
2842 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2843 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2844 // -Xbatch
2845 } else if (match_option(option, "-Xbatch", &tail)) {
2846 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2847 // -Xmn for compatibility with other JVM vendors
2848 } else if (match_option(option, "-Xmn", &tail)) {
2849 julong long_initial_young_size = 0;
2850 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2851 if (errcode != arg_in_range) {
2852 jio_fprintf(defaultStream::error_stream(),
2853 "Invalid initial young generation size: %s\n", option->optionString);
2854 describe_range_error(errcode);
2855 return JNI_EINVAL;
2856 }
2857 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2858 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2859 // -Xms
2860 } else if (match_option(option, "-Xms", &tail)) {
2861 julong long_initial_heap_size = 0;
2862 // an initial heap size of 0 means automatically determine
2863 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2864 if (errcode != arg_in_range) {
2865 jio_fprintf(defaultStream::error_stream(),
2866 "Invalid initial heap size: %s\n", option->optionString);
2867 describe_range_error(errcode);
2868 return JNI_EINVAL;
2869 }
2870 set_min_heap_size((uintx)long_initial_heap_size);
2871 // Currently the minimum size and the initial heap sizes are the same.
2872 // Can be overridden with -XX:InitialHeapSize.
2873 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2874 // -Xmx
2875 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2876 julong long_max_heap_size = 0;
2877 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2878 if (errcode != arg_in_range) {
2879 jio_fprintf(defaultStream::error_stream(),
2880 "Invalid maximum heap size: %s\n", option->optionString);
2881 describe_range_error(errcode);
2882 return JNI_EINVAL;
2883 }
2884 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2885 // Xmaxf
2886 } else if (match_option(option, "-Xmaxf", &tail)) {
2887 char* err;
2888 int maxf = (int)(strtod(tail, &err) * 100);
2889 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2890 jio_fprintf(defaultStream::error_stream(),
2891 "Bad max heap free percentage size: %s\n",
2892 option->optionString);
2893 return JNI_EINVAL;
2894 } else {
2895 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2896 }
2897 // Xminf
2898 } else if (match_option(option, "-Xminf", &tail)) {
2899 char* err;
2900 int minf = (int)(strtod(tail, &err) * 100);
2901 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2902 jio_fprintf(defaultStream::error_stream(),
2903 "Bad min heap free percentage size: %s\n",
2904 option->optionString);
2905 return JNI_EINVAL;
2906 } else {
2907 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2908 }
2909 // -Xss
2910 } else if (match_option(option, "-Xss", &tail)) {
2911 julong long_ThreadStackSize = 0;
2912 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2913 if (errcode != arg_in_range) {
2914 jio_fprintf(defaultStream::error_stream(),
2915 "Invalid thread stack size: %s\n", option->optionString);
2916 describe_range_error(errcode);
2917 return JNI_EINVAL;
2918 }
2919 // Internally track ThreadStackSize in units of 1024 bytes.
2920 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2921 round_to((int)long_ThreadStackSize, K) / K);
2922 // -Xoss
2923 } else if (match_option(option, "-Xoss", &tail)) {
2924 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2925 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2926 julong long_CodeCacheExpansionSize = 0;
2927 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2928 if (errcode != arg_in_range) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2931 os::vm_page_size()/K);
2932 return JNI_EINVAL;
2933 }
2934 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2935 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2936 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2937 julong long_ReservedCodeCacheSize = 0;
2939 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2940 if (errcode != arg_in_range) {
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Invalid maximum code cache size: %s.\n", option->optionString);
2943 return JNI_EINVAL;
2944 }
2945 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2946 //-XX:IncreaseFirstTierCompileThresholdAt=
2947 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2948 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2949 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2950 jio_fprintf(defaultStream::error_stream(),
2951 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2952 option->optionString);
2953 return JNI_EINVAL;
2954 }
2955 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2956 // -green
2957 } else if (match_option(option, "-green", &tail)) {
2958 jio_fprintf(defaultStream::error_stream(),
2959 "Green threads support not available\n");
2960 return JNI_EINVAL;
2961 // -native
2962 } else if (match_option(option, "-native", &tail)) {
2963 // HotSpot always uses native threads, ignore silently for compatibility
2964 // -Xsqnopause
2965 } else if (match_option(option, "-Xsqnopause", &tail)) {
2966 // EVM option, ignore silently for compatibility
2967 // -Xrs
2968 } else if (match_option(option, "-Xrs", &tail)) {
2969 // Classic/EVM option, new functionality
2970 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2971 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2972 // change default internal VM signals used - lower case for back compat
2973 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2974 // -Xoptimize
2975 } else if (match_option(option, "-Xoptimize", &tail)) {
2976 // EVM option, ignore silently for compatibility
2977 // -Xprof
2978 } else if (match_option(option, "-Xprof", &tail)) {
2979 #if INCLUDE_FPROF
2980 _has_profile = true;
2981 #else // INCLUDE_FPROF
2982 jio_fprintf(defaultStream::error_stream(),
2983 "Flat profiling is not supported in this VM.\n");
2984 return JNI_ERR;
2985 #endif // INCLUDE_FPROF
2986 // -Xconcurrentio
2987 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2988 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2989 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2990 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2991 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2992 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2994 // -Xinternalversion
2995 } else if (match_option(option, "-Xinternalversion", &tail)) {
2996 jio_fprintf(defaultStream::output_stream(), "%s\n",
2997 VM_Version::internal_vm_info_string());
2998 vm_exit(0);
2999 #ifndef PRODUCT
3000 // -Xprintflags
3001 } else if (match_option(option, "-Xprintflags", &tail)) {
3002 CommandLineFlags::printFlags(tty, false);
3003 vm_exit(0);
3004 #endif
3005 // -D
3006 } else if (match_option(option, "-D", &tail)) {
3007 if (CheckEndorsedAndExtDirs) {
3008 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3009 // abort if -Djava.endorsed.dirs is set
3010 jio_fprintf(defaultStream::output_stream(),
3011 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3012 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3013 return JNI_EINVAL;
3014 }
3015 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3016 // abort if -Djava.ext.dirs is set
3017 jio_fprintf(defaultStream::output_stream(),
3018 "-Djava.ext.dirs will not be supported in a future release.\n"
3019 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3020 return JNI_EINVAL;
3021 }
3022 }
3024 if (!add_property(tail)) {
3025 return JNI_ENOMEM;
3026 }
3027 // Out of the box management support
3028 if (match_option(option, "-Dcom.sun.management", &tail)) {
3029 #if INCLUDE_MANAGEMENT
3030 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3031 #else
3032 jio_fprintf(defaultStream::output_stream(),
3033 "-Dcom.sun.management is not supported in this VM.\n");
3034 return JNI_ERR;
3035 #endif
3036 }
3037 // -Xint
3038 } else if (match_option(option, "-Xint", &tail)) {
3039 set_mode_flags(_int);
3040 // -Xmixed
3041 } else if (match_option(option, "-Xmixed", &tail)) {
3042 set_mode_flags(_mixed);
3043 // -Xcomp
3044 } else if (match_option(option, "-Xcomp", &tail)) {
3045 // for testing the compiler; turn off all flags that inhibit compilation
3046 set_mode_flags(_comp);
3047 // -Xshare:dump
3048 } else if (match_option(option, "-Xshare:dump", &tail)) {
3049 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3050 set_mode_flags(_int); // Prevent compilation, which creates objects
3051 // -Xshare:on
3052 } else if (match_option(option, "-Xshare:on", &tail)) {
3053 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3054 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3055 // -Xshare:auto
3056 } else if (match_option(option, "-Xshare:auto", &tail)) {
3057 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3058 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3059 // -Xshare:off
3060 } else if (match_option(option, "-Xshare:off", &tail)) {
3061 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3062 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3063 // -Xverify
3064 } else if (match_option(option, "-Xverify", &tail)) {
3065 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3066 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3067 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3068 } else if (strcmp(tail, ":remote") == 0) {
3069 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3070 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3071 } else if (strcmp(tail, ":none") == 0) {
3072 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3073 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3074 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3075 return JNI_EINVAL;
3076 }
3077 // -Xdebug
3078 } else if (match_option(option, "-Xdebug", &tail)) {
3079 // note this flag has been used, then ignore
3080 set_xdebug_mode(true);
3081 // -Xnoagent
3082 } else if (match_option(option, "-Xnoagent", &tail)) {
3083 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3084 } else if (match_option(option, "-Xboundthreads", &tail)) {
3085 // Bind user level threads to kernel threads (Solaris only)
3086 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3087 } else if (match_option(option, "-Xloggc:", &tail)) {
3088 // Redirect GC output to the file. -Xloggc:<filename>
3089 // ostream_init_log(), when called will use this filename
3090 // to initialize a fileStream.
3091 _gc_log_filename = strdup(tail);
3092 if (!is_filename_valid(_gc_log_filename)) {
3093 jio_fprintf(defaultStream::output_stream(),
3094 "Invalid file name for use with -Xloggc: Filename can only contain the "
3095 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3096 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3097 return JNI_EINVAL;
3098 }
3099 FLAG_SET_CMDLINE(bool, PrintGC, true);
3100 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3102 // JNI hooks
3103 } else if (match_option(option, "-Xcheck", &tail)) {
3104 if (!strcmp(tail, ":jni")) {
3105 #if !INCLUDE_JNI_CHECK
3106 warning("JNI CHECKING is not supported in this VM");
3107 #else
3108 CheckJNICalls = true;
3109 #endif // INCLUDE_JNI_CHECK
3110 } else if (is_bad_option(option, args->ignoreUnrecognized,
3111 "check")) {
3112 return JNI_EINVAL;
3113 }
3114 } else if (match_option(option, "vfprintf", &tail)) {
3115 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3116 } else if (match_option(option, "exit", &tail)) {
3117 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3118 } else if (match_option(option, "abort", &tail)) {
3119 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3120 // -XX:+AggressiveHeap
3121 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3123 // This option inspects the machine and attempts to set various
3124 // parameters to be optimal for long-running, memory allocation
3125 // intensive jobs. It is intended for machines with large
3126 // amounts of cpu and memory.
3128 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3129 // VM, but we may not be able to represent the total physical memory
3130 // available (like having 8gb of memory on a box but using a 32bit VM).
3131 // Thus, we need to make sure we're using a julong for intermediate
3132 // calculations.
3133 julong initHeapSize;
3134 julong total_memory = os::physical_memory();
3136 if (total_memory < (julong)256*M) {
3137 jio_fprintf(defaultStream::error_stream(),
3138 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3139 vm_exit(1);
3140 }
3142 // The heap size is half of available memory, or (at most)
3143 // all of possible memory less 160mb (leaving room for the OS
3144 // when using ISM). This is the maximum; because adaptive sizing
3145 // is turned on below, the actual space used may be smaller.
3147 initHeapSize = MIN2(total_memory / (julong)2,
3148 total_memory - (julong)160*M);
3150 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3152 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3153 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3154 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3155 // Currently the minimum size and the initial heap sizes are the same.
3156 set_min_heap_size(initHeapSize);
3157 }
3158 if (FLAG_IS_DEFAULT(NewSize)) {
3159 // Make the young generation 3/8ths of the total heap.
3160 FLAG_SET_CMDLINE(uintx, NewSize,
3161 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3162 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3163 }
3165 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3166 FLAG_SET_DEFAULT(UseLargePages, true);
3167 #endif
3169 // Increase some data structure sizes for efficiency
3170 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3171 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3172 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3174 // See the OldPLABSize comment below, but replace 'after promotion'
3175 // with 'after copying'. YoungPLABSize is the size of the survivor
3176 // space per-gc-thread buffers. The default is 4kw.
3177 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3179 // OldPLABSize is the size of the buffers in the old gen that
3180 // UseParallelGC uses to promote live data that doesn't fit in the
3181 // survivor spaces. At any given time, there's one for each gc thread.
3182 // The default size is 1kw. These buffers are rarely used, since the
3183 // survivor spaces are usually big enough. For specjbb, however, there
3184 // are occasions when there's lots of live data in the young gen
3185 // and we end up promoting some of it. We don't have a definite
3186 // explanation for why bumping OldPLABSize helps, but the theory
3187 // is that a bigger PLAB results in retaining something like the
3188 // original allocation order after promotion, which improves mutator
3189 // locality. A minor effect may be that larger PLABs reduce the
3190 // number of PLAB allocation events during gc. The value of 8kw
3191 // was arrived at by experimenting with specjbb.
3192 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3194 // Enable parallel GC and adaptive generation sizing
3195 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3196 FLAG_SET_DEFAULT(ParallelGCThreads,
3197 Abstract_VM_Version::parallel_worker_threads());
3199 // Encourage steady state memory management
3200 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3202 // This appears to improve mutator locality
3203 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3205 // Get around early Solaris scheduling bug
3206 // (affinity vs other jobs on system)
3207 // but disallow DR and offlining (5008695).
3208 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3210 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3211 // The last option must always win.
3212 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3213 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3214 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3215 // The last option must always win.
3216 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3217 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3218 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3219 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3220 jio_fprintf(defaultStream::error_stream(),
3221 "Please use CMSClassUnloadingEnabled in place of "
3222 "CMSPermGenSweepingEnabled in the future\n");
3223 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3224 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3225 jio_fprintf(defaultStream::error_stream(),
3226 "Please use -XX:+UseGCOverheadLimit in place of "
3227 "-XX:+UseGCTimeLimit in the future\n");
3228 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3229 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3230 jio_fprintf(defaultStream::error_stream(),
3231 "Please use -XX:-UseGCOverheadLimit in place of "
3232 "-XX:-UseGCTimeLimit in the future\n");
3233 // The TLE options are for compatibility with 1.3 and will be
3234 // removed without notice in a future release. These options
3235 // are not to be documented.
3236 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3237 // No longer used.
3238 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3239 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3240 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3241 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3242 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3243 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3244 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3245 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3246 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3247 // No longer used.
3248 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3249 julong long_tlab_size = 0;
3250 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3251 if (errcode != arg_in_range) {
3252 jio_fprintf(defaultStream::error_stream(),
3253 "Invalid TLAB size: %s\n", option->optionString);
3254 describe_range_error(errcode);
3255 return JNI_EINVAL;
3256 }
3257 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3258 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3259 // No longer used.
3260 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3261 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3262 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3263 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3264 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3265 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3266 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3267 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3268 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3269 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3270 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3271 #if defined(DTRACE_ENABLED)
3272 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3273 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3274 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3275 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3276 #else // defined(DTRACE_ENABLED)
3277 jio_fprintf(defaultStream::error_stream(),
3278 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3279 return JNI_EINVAL;
3280 #endif // defined(DTRACE_ENABLED)
3281 #ifdef ASSERT
3282 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3283 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3284 // disable scavenge before parallel mark-compact
3285 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3286 #endif
3287 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3288 julong cms_blocks_to_claim = (julong)atol(tail);
3289 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3290 jio_fprintf(defaultStream::error_stream(),
3291 "Please use -XX:OldPLABSize in place of "
3292 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3293 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3294 julong cms_blocks_to_claim = (julong)atol(tail);
3295 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3296 jio_fprintf(defaultStream::error_stream(),
3297 "Please use -XX:OldPLABSize in place of "
3298 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3299 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3300 julong old_plab_size = 0;
3301 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3302 if (errcode != arg_in_range) {
3303 jio_fprintf(defaultStream::error_stream(),
3304 "Invalid old PLAB size: %s\n", option->optionString);
3305 describe_range_error(errcode);
3306 return JNI_EINVAL;
3307 }
3308 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3309 jio_fprintf(defaultStream::error_stream(),
3310 "Please use -XX:OldPLABSize in place of "
3311 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3312 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3313 julong young_plab_size = 0;
3314 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3315 if (errcode != arg_in_range) {
3316 jio_fprintf(defaultStream::error_stream(),
3317 "Invalid young PLAB size: %s\n", option->optionString);
3318 describe_range_error(errcode);
3319 return JNI_EINVAL;
3320 }
3321 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Please use -XX:YoungPLABSize in place of "
3324 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3325 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3326 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3327 julong stack_size = 0;
3328 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3329 if (errcode != arg_in_range) {
3330 jio_fprintf(defaultStream::error_stream(),
3331 "Invalid mark stack size: %s\n", option->optionString);
3332 describe_range_error(errcode);
3333 return JNI_EINVAL;
3334 }
3335 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3336 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3337 julong max_stack_size = 0;
3338 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3339 if (errcode != arg_in_range) {
3340 jio_fprintf(defaultStream::error_stream(),
3341 "Invalid maximum mark stack size: %s\n",
3342 option->optionString);
3343 describe_range_error(errcode);
3344 return JNI_EINVAL;
3345 }
3346 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3347 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3348 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3349 uintx conc_threads = 0;
3350 if (!parse_uintx(tail, &conc_threads, 1)) {
3351 jio_fprintf(defaultStream::error_stream(),
3352 "Invalid concurrent threads: %s\n", option->optionString);
3353 return JNI_EINVAL;
3354 }
3355 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3356 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3357 julong max_direct_memory_size = 0;
3358 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3359 if (errcode != arg_in_range) {
3360 jio_fprintf(defaultStream::error_stream(),
3361 "Invalid maximum direct memory size: %s\n",
3362 option->optionString);
3363 describe_range_error(errcode);
3364 return JNI_EINVAL;
3365 }
3366 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3367 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3368 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3369 // away and will cause VM initialization failures!
3370 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3371 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3372 #if !INCLUDE_MANAGEMENT
3373 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3374 jio_fprintf(defaultStream::error_stream(),
3375 "ManagementServer is not supported in this VM.\n");
3376 return JNI_ERR;
3377 #endif // INCLUDE_MANAGEMENT
3378 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3379 // Skip -XX:Flags= since that case has already been handled
3380 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3381 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3382 return JNI_EINVAL;
3383 }
3384 }
3385 // Unknown option
3386 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3387 return JNI_ERR;
3388 }
3389 }
3391 // PrintSharedArchiveAndExit will turn on
3392 // -Xshare:on
3393 // -XX:+TraceClassPaths
3394 if (PrintSharedArchiveAndExit) {
3395 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3396 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3397 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3398 }
3400 // Change the default value for flags which have different default values
3401 // when working with older JDKs.
3402 #ifdef LINUX
3403 if (JDK_Version::current().compare_major(6) <= 0 &&
3404 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3405 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3406 }
3407 #endif // LINUX
3408 fix_appclasspath();
3409 return JNI_OK;
3410 }
3412 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3413 //
3414 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3415 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3416 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3417 // path is treated as the current directory.
3418 //
3419 // This causes problems with CDS, which requires that all directories specified in the classpath
3420 // must be empty. In most cases, applications do NOT want to load classes from the current
3421 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3422 // scripts compatible with CDS.
3423 void Arguments::fix_appclasspath() {
3424 if (IgnoreEmptyClassPaths) {
3425 const char separator = *os::path_separator();
3426 const char* src = _java_class_path->value();
3428 // skip over all the leading empty paths
3429 while (*src == separator) {
3430 src ++;
3431 }
3433 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3434 strncpy(copy, src, strlen(src) + 1);
3436 // trim all trailing empty paths
3437 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3438 *tail = '\0';
3439 }
3441 char from[3] = {separator, separator, '\0'};
3442 char to [2] = {separator, '\0'};
3443 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3444 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3445 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3446 }
3448 _java_class_path->set_value(copy);
3449 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3450 }
3452 if (!PrintSharedArchiveAndExit) {
3453 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3454 }
3455 }
3457 static bool has_jar_files(const char* directory) {
3458 DIR* dir = os::opendir(directory);
3459 if (dir == NULL) return false;
3461 struct dirent *entry;
3462 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3463 bool hasJarFile = false;
3464 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3465 const char* name = entry->d_name;
3466 const char* ext = name + strlen(name) - 4;
3467 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3468 }
3469 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3470 os::closedir(dir);
3471 return hasJarFile ;
3472 }
3474 // returns the number of directories in the given path containing JAR files
3475 // If the skip argument is not NULL, it will skip that directory
3476 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3477 const char separator = *os::path_separator();
3478 const char* const end = path + strlen(path);
3479 int nonEmptyDirs = 0;
3480 while (path < end) {
3481 const char* tmp_end = strchr(path, separator);
3482 if (tmp_end == NULL) {
3483 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3484 nonEmptyDirs++;
3485 jio_fprintf(defaultStream::output_stream(),
3486 "Non-empty %s directory: %s\n", type, path);
3487 }
3488 path = end;
3489 } else {
3490 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3491 memcpy(dirpath, path, tmp_end - path);
3492 dirpath[tmp_end - path] = '\0';
3493 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3494 nonEmptyDirs++;
3495 jio_fprintf(defaultStream::output_stream(),
3496 "Non-empty %s directory: %s\n", type, dirpath);
3497 }
3498 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3499 path = tmp_end + 1;
3500 }
3501 }
3502 return nonEmptyDirs;
3503 }
3505 // Returns true if endorsed standards override mechanism and extension mechanism
3506 // are not used.
3507 static bool check_endorsed_and_ext_dirs() {
3508 if (!CheckEndorsedAndExtDirs)
3509 return true;
3511 char endorsedDir[JVM_MAXPATHLEN];
3512 char extDir[JVM_MAXPATHLEN];
3513 const char* fileSep = os::file_separator();
3514 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3515 Arguments::get_java_home(), fileSep, fileSep);
3516 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3517 Arguments::get_java_home(), fileSep, fileSep);
3519 // check endorsed directory
3520 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3522 // check the extension directories but skip the default lib/ext directory
3523 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3525 // List of JAR files installed in the default lib/ext directory.
3526 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3527 static const char* jdk_ext_jars[] = {
3528 "access-bridge-32.jar",
3529 "access-bridge-64.jar",
3530 "access-bridge.jar",
3531 "cldrdata.jar",
3532 "dnsns.jar",
3533 "jaccess.jar",
3534 "jfxrt.jar",
3535 "localedata.jar",
3536 "nashorn.jar",
3537 "sunec.jar",
3538 "sunjce_provider.jar",
3539 "sunmscapi.jar",
3540 "sunpkcs11.jar",
3541 "ucrypto.jar",
3542 "zipfs.jar",
3543 NULL
3544 };
3546 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3547 DIR* dir = os::opendir(extDir);
3548 if (dir != NULL) {
3549 int num_ext_jars = 0;
3550 struct dirent *entry;
3551 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
3552 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3553 const char* name = entry->d_name;
3554 const char* ext = name + strlen(name) - 4;
3555 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3556 bool is_jdk_jar = false;
3557 const char* jarfile = NULL;
3558 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3559 if (os::file_name_strcmp(name, jarfile) == 0) {
3560 is_jdk_jar = true;
3561 break;
3562 }
3563 }
3564 if (!is_jdk_jar) {
3565 jio_fprintf(defaultStream::output_stream(),
3566 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3567 num_ext_jars++;
3568 }
3569 }
3570 }
3571 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3572 os::closedir(dir);
3573 if (num_ext_jars > 0) {
3574 nonEmptyDirs += 1;
3575 }
3576 }
3578 // check if the default lib/endorsed directory exists; if so, error
3579 dir = os::opendir(endorsedDir);
3580 if (dir != NULL) {
3581 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3582 os::closedir(dir);
3583 nonEmptyDirs += 1;
3584 }
3586 if (nonEmptyDirs > 0) {
3587 jio_fprintf(defaultStream::output_stream(),
3588 "Endorsed standards override mechanism and extension mechanism "
3589 "will not be supported in a future release.\n"
3590 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3591 return false;
3592 }
3594 return true;
3595 }
3597 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3598 // This must be done after all -D arguments have been processed.
3599 scp_p->expand_endorsed();
3601 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3602 // Assemble the bootclasspath elements into the final path.
3603 Arguments::set_sysclasspath(scp_p->combined_path());
3604 }
3606 if (!check_endorsed_and_ext_dirs()) {
3607 return JNI_ERR;
3608 }
3610 // This must be done after all arguments have been processed.
3611 // java_compiler() true means set to "NONE" or empty.
3612 if (java_compiler() && !xdebug_mode()) {
3613 // For backwards compatibility, we switch to interpreted mode if
3614 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3615 // not specified.
3616 set_mode_flags(_int);
3617 }
3618 if (CompileThreshold == 0) {
3619 set_mode_flags(_int);
3620 }
3622 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3623 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3624 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3625 }
3627 #ifndef COMPILER2
3628 // Don't degrade server performance for footprint
3629 if (FLAG_IS_DEFAULT(UseLargePages) &&
3630 MaxHeapSize < LargePageHeapSizeThreshold) {
3631 // No need for large granularity pages w/small heaps.
3632 // Note that large pages are enabled/disabled for both the
3633 // Java heap and the code cache.
3634 FLAG_SET_DEFAULT(UseLargePages, false);
3635 }
3637 #else
3638 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3639 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3640 }
3641 #endif
3643 #ifndef TIERED
3644 // Tiered compilation is undefined.
3645 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3646 #endif
3648 // If we are running in a headless jre, force java.awt.headless property
3649 // to be true unless the property has already been set.
3650 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3651 if (os::is_headless_jre()) {
3652 const char* headless = Arguments::get_property("java.awt.headless");
3653 if (headless == NULL) {
3654 char envbuffer[128];
3655 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3656 if (!add_property("java.awt.headless=true")) {
3657 return JNI_ENOMEM;
3658 }
3659 } else {
3660 char buffer[256];
3661 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3662 if (!add_property(buffer)) {
3663 return JNI_ENOMEM;
3664 }
3665 }
3666 }
3667 }
3669 if (!check_vm_args_consistency()) {
3670 return JNI_ERR;
3671 }
3673 return JNI_OK;
3674 }
3676 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3677 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3678 scp_assembly_required_p);
3679 }
3681 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3682 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3683 scp_assembly_required_p);
3684 }
3686 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3687 const int N_MAX_OPTIONS = 64;
3688 const int OPTION_BUFFER_SIZE = 1024;
3689 char buffer[OPTION_BUFFER_SIZE];
3691 // The variable will be ignored if it exceeds the length of the buffer.
3692 // Don't check this variable if user has special privileges
3693 // (e.g. unix su command).
3694 if (os::getenv(name, buffer, sizeof(buffer)) &&
3695 !os::have_special_privileges()) {
3696 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3697 jio_fprintf(defaultStream::error_stream(),
3698 "Picked up %s: %s\n", name, buffer);
3699 char* rd = buffer; // pointer to the input string (rd)
3700 int i;
3701 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3702 while (isspace(*rd)) rd++; // skip whitespace
3703 if (*rd == 0) break; // we re done when the input string is read completely
3705 // The output, option string, overwrites the input string.
3706 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3707 // input string (rd).
3708 char* wrt = rd;
3710 options[i++].optionString = wrt; // Fill in option
3711 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3712 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3713 int quote = *rd; // matching quote to look for
3714 rd++; // don't copy open quote
3715 while (*rd != quote) { // include everything (even spaces) up until quote
3716 if (*rd == 0) { // string termination means unmatched string
3717 jio_fprintf(defaultStream::error_stream(),
3718 "Unmatched quote in %s\n", name);
3719 return JNI_ERR;
3720 }
3721 *wrt++ = *rd++; // copy to option string
3722 }
3723 rd++; // don't copy close quote
3724 } else {
3725 *wrt++ = *rd++; // copy to option string
3726 }
3727 }
3728 // Need to check if we're done before writing a NULL,
3729 // because the write could be to the byte that rd is pointing to.
3730 if (*rd++ == 0) {
3731 *wrt = 0;
3732 break;
3733 }
3734 *wrt = 0; // Zero terminate option
3735 }
3736 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3737 JavaVMInitArgs vm_args;
3738 vm_args.version = JNI_VERSION_1_2;
3739 vm_args.options = options;
3740 vm_args.nOptions = i;
3741 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3743 if (PrintVMOptions) {
3744 const char* tail;
3745 for (int i = 0; i < vm_args.nOptions; i++) {
3746 const JavaVMOption *option = vm_args.options + i;
3747 if (match_option(option, "-XX:", &tail)) {
3748 logOption(tail);
3749 }
3750 }
3751 }
3753 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3754 }
3755 return JNI_OK;
3756 }
3758 void Arguments::set_shared_spaces_flags() {
3759 if (DumpSharedSpaces) {
3760 if (FailOverToOldVerifier) {
3761 // Don't fall back to the old verifier on verification failure. If a
3762 // class fails verification with the split verifier, it might fail the
3763 // CDS runtime verifier constraint check. In that case, we don't want
3764 // to share the class. We only archive classes that pass the split verifier.
3765 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3766 }
3768 if (RequireSharedSpaces) {
3769 warning("cannot dump shared archive while using shared archive");
3770 }
3771 UseSharedSpaces = false;
3772 #ifdef _LP64
3773 if (!UseCompressedOops || !UseCompressedClassPointers) {
3774 vm_exit_during_initialization(
3775 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3776 }
3777 } else {
3778 if (!UseCompressedOops || !UseCompressedClassPointers) {
3779 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3780 }
3781 #endif
3782 }
3783 }
3785 #if !INCLUDE_ALL_GCS
3786 static void force_serial_gc() {
3787 FLAG_SET_DEFAULT(UseSerialGC, true);
3788 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3789 UNSUPPORTED_GC_OPTION(UseG1GC);
3790 UNSUPPORTED_GC_OPTION(UseParallelGC);
3791 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3792 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3793 UNSUPPORTED_GC_OPTION(UseParNewGC);
3794 }
3795 #endif // INCLUDE_ALL_GCS
3797 // Sharing support
3798 // Construct the path to the archive
3799 static char* get_shared_archive_path() {
3800 char *shared_archive_path;
3801 if (SharedArchiveFile == NULL) {
3802 char jvm_path[JVM_MAXPATHLEN];
3803 os::jvm_path(jvm_path, sizeof(jvm_path));
3804 char *end = strrchr(jvm_path, *os::file_separator());
3805 if (end != NULL) *end = '\0';
3806 size_t jvm_path_len = strlen(jvm_path);
3807 size_t file_sep_len = strlen(os::file_separator());
3808 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3809 file_sep_len + 20, mtInternal);
3810 if (shared_archive_path != NULL) {
3811 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3812 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3813 strncat(shared_archive_path, "classes.jsa", 11);
3814 }
3815 } else {
3816 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3817 if (shared_archive_path != NULL) {
3818 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3819 }
3820 }
3821 return shared_archive_path;
3822 }
3824 #ifndef PRODUCT
3825 // Determine whether LogVMOutput should be implicitly turned on.
3826 static bool use_vm_log() {
3827 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3828 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3829 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3830 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3831 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3832 return true;
3833 }
3835 #ifdef COMPILER1
3836 if (PrintC1Statistics) {
3837 return true;
3838 }
3839 #endif // COMPILER1
3841 #ifdef COMPILER2
3842 if (PrintOptoAssembly || PrintOptoStatistics) {
3843 return true;
3844 }
3845 #endif // COMPILER2
3847 return false;
3848 }
3849 #endif // PRODUCT
3851 // Parse entry point called from JNI_CreateJavaVM
3853 jint Arguments::parse(const JavaVMInitArgs* args) {
3855 // Remaining part of option string
3856 const char* tail;
3858 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3859 const char* hotspotrc = ".hotspotrc";
3860 bool settings_file_specified = false;
3861 bool needs_hotspotrc_warning = false;
3863 ArgumentsExt::process_options(args);
3865 const char* flags_file;
3866 int index;
3867 for (index = 0; index < args->nOptions; index++) {
3868 const JavaVMOption *option = args->options + index;
3869 if (match_option(option, "-XX:Flags=", &tail)) {
3870 flags_file = tail;
3871 settings_file_specified = true;
3872 }
3873 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3874 PrintVMOptions = true;
3875 }
3876 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3877 PrintVMOptions = false;
3878 }
3879 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3880 IgnoreUnrecognizedVMOptions = true;
3881 }
3882 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3883 IgnoreUnrecognizedVMOptions = false;
3884 }
3885 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3886 CommandLineFlags::printFlags(tty, false);
3887 vm_exit(0);
3888 }
3889 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3890 #if INCLUDE_NMT
3891 // The launcher did not setup nmt environment variable properly.
3892 if (!MemTracker::check_launcher_nmt_support(tail)) {
3893 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3894 }
3896 // Verify if nmt option is valid.
3897 if (MemTracker::verify_nmt_option()) {
3898 // Late initialization, still in single-threaded mode.
3899 if (MemTracker::tracking_level() >= NMT_summary) {
3900 MemTracker::init();
3901 }
3902 } else {
3903 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3904 }
3905 #else
3906 jio_fprintf(defaultStream::error_stream(),
3907 "Native Memory Tracking is not supported in this VM\n");
3908 return JNI_ERR;
3909 #endif
3910 }
3913 #ifndef PRODUCT
3914 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3915 CommandLineFlags::printFlags(tty, true);
3916 vm_exit(0);
3917 }
3918 #endif
3919 }
3921 if (IgnoreUnrecognizedVMOptions) {
3922 // uncast const to modify the flag args->ignoreUnrecognized
3923 *(jboolean*)(&args->ignoreUnrecognized) = true;
3924 }
3926 // Parse specified settings file
3927 if (settings_file_specified) {
3928 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3929 return JNI_EINVAL;
3930 }
3931 } else {
3932 #ifdef ASSERT
3933 // Parse default .hotspotrc settings file
3934 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3935 return JNI_EINVAL;
3936 }
3937 #else
3938 struct stat buf;
3939 if (os::stat(hotspotrc, &buf) == 0) {
3940 needs_hotspotrc_warning = true;
3941 }
3942 #endif
3943 }
3945 if (PrintVMOptions) {
3946 for (index = 0; index < args->nOptions; index++) {
3947 const JavaVMOption *option = args->options + index;
3948 if (match_option(option, "-XX:", &tail)) {
3949 logOption(tail);
3950 }
3951 }
3952 }
3954 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3955 jint result = parse_vm_init_args(args);
3956 if (result != JNI_OK) {
3957 return result;
3958 }
3960 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3961 SharedArchivePath = get_shared_archive_path();
3962 if (SharedArchivePath == NULL) {
3963 return JNI_ENOMEM;
3964 }
3966 // Set up VerifySharedSpaces
3967 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3968 VerifySharedSpaces = true;
3969 }
3971 // Delay warning until here so that we've had a chance to process
3972 // the -XX:-PrintWarnings flag
3973 if (needs_hotspotrc_warning) {
3974 warning("%s file is present but has been ignored. "
3975 "Run with -XX:Flags=%s to load the file.",
3976 hotspotrc, hotspotrc);
3977 }
3979 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3980 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3981 #endif
3983 #if INCLUDE_ALL_GCS
3984 #if (defined JAVASE_EMBEDDED || defined ARM)
3985 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3986 #endif
3987 #endif
3989 #ifndef PRODUCT
3990 if (TraceBytecodesAt != 0) {
3991 TraceBytecodes = true;
3992 }
3993 if (CountCompiledCalls) {
3994 if (UseCounterDecay) {
3995 warning("UseCounterDecay disabled because CountCalls is set");
3996 UseCounterDecay = false;
3997 }
3998 }
3999 #endif // PRODUCT
4001 // JSR 292 is not supported before 1.7
4002 if (!JDK_Version::is_gte_jdk17x_version()) {
4003 if (EnableInvokeDynamic) {
4004 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4005 warning("JSR 292 is not supported before 1.7. Disabling support.");
4006 }
4007 EnableInvokeDynamic = false;
4008 }
4009 }
4011 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4012 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4013 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4014 }
4015 ScavengeRootsInCode = 1;
4016 }
4018 if (PrintGCDetails) {
4019 // Turn on -verbose:gc options as well
4020 PrintGC = true;
4021 }
4023 if (!JDK_Version::is_gte_jdk18x_version()) {
4024 // To avoid changing the log format for 7 updates this flag is only
4025 // true by default in JDK8 and above.
4026 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4027 FLAG_SET_DEFAULT(PrintGCCause, false);
4028 }
4029 }
4031 // Set object alignment values.
4032 set_object_alignment();
4034 #if !INCLUDE_ALL_GCS
4035 force_serial_gc();
4036 #endif // INCLUDE_ALL_GCS
4037 #if !INCLUDE_CDS
4038 if (DumpSharedSpaces || RequireSharedSpaces) {
4039 jio_fprintf(defaultStream::error_stream(),
4040 "Shared spaces are not supported in this VM\n");
4041 return JNI_ERR;
4042 }
4043 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4044 warning("Shared spaces are not supported in this VM");
4045 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4046 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4047 }
4048 no_shared_spaces("CDS Disabled");
4049 #endif // INCLUDE_CDS
4051 return JNI_OK;
4052 }
4054 jint Arguments::apply_ergo() {
4056 // Set flags based on ergonomics.
4057 set_ergonomics_flags();
4059 set_shared_spaces_flags();
4061 // Check the GC selections again.
4062 if (!check_gc_consistency()) {
4063 return JNI_EINVAL;
4064 }
4066 if (TieredCompilation) {
4067 set_tiered_flags();
4068 } else {
4069 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4070 if (CompilationPolicyChoice >= 2) {
4071 vm_exit_during_initialization(
4072 "Incompatible compilation policy selected", NULL);
4073 }
4074 }
4075 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4076 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4077 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4078 }
4081 // Set heap size based on available physical memory
4082 set_heap_size();
4084 ArgumentsExt::set_gc_specific_flags();
4086 // Initialize Metaspace flags and alignments.
4087 Metaspace::ergo_initialize();
4089 // Set bytecode rewriting flags
4090 set_bytecode_flags();
4092 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4093 set_aggressive_opts_flags();
4095 // Turn off biased locking for locking debug mode flags,
4096 // which are subtlely different from each other but neither works with
4097 // biased locking.
4098 if (UseHeavyMonitors
4099 #ifdef COMPILER1
4100 || !UseFastLocking
4101 #endif // COMPILER1
4102 ) {
4103 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4104 // flag set to true on command line; warn the user that they
4105 // can't enable biased locking here
4106 warning("Biased Locking is not supported with locking debug flags"
4107 "; ignoring UseBiasedLocking flag." );
4108 }
4109 UseBiasedLocking = false;
4110 }
4112 #ifdef ZERO
4113 // Clear flags not supported on zero.
4114 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4115 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4116 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4117 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4118 #endif // CC_INTERP
4120 #ifdef COMPILER2
4121 if (!EliminateLocks) {
4122 EliminateNestedLocks = false;
4123 }
4124 if (!Inline) {
4125 IncrementalInline = false;
4126 }
4127 #ifndef PRODUCT
4128 if (!IncrementalInline) {
4129 AlwaysIncrementalInline = false;
4130 }
4131 #endif
4132 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4133 // incremental inlining: bump MaxNodeLimit
4134 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4135 }
4136 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4137 // nothing to use the profiling, turn if off
4138 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4139 }
4140 #endif
4142 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4143 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4144 DebugNonSafepoints = true;
4145 }
4147 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4148 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4149 }
4151 #ifndef PRODUCT
4152 if (CompileTheWorld) {
4153 // Force NmethodSweeper to sweep whole CodeCache each time.
4154 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4155 NmethodSweepFraction = 1;
4156 }
4157 }
4159 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4160 if (use_vm_log()) {
4161 LogVMOutput = true;
4162 }
4163 }
4164 #endif // PRODUCT
4166 if (PrintCommandLineFlags) {
4167 CommandLineFlags::printSetFlags(tty);
4168 }
4170 // Apply CPU specific policy for the BiasedLocking
4171 if (UseBiasedLocking) {
4172 if (!VM_Version::use_biased_locking() &&
4173 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4174 UseBiasedLocking = false;
4175 }
4176 }
4177 #ifdef COMPILER2
4178 if (!UseBiasedLocking || EmitSync != 0) {
4179 UseOptoBiasInlining = false;
4180 }
4181 #endif
4183 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4184 // but only if not already set on the commandline
4185 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4186 bool set = false;
4187 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4188 if (!set) {
4189 FLAG_SET_DEFAULT(PauseAtExit, true);
4190 }
4191 }
4193 return JNI_OK;
4194 }
4196 jint Arguments::adjust_after_os() {
4197 if (UseNUMA) {
4198 if (UseParallelGC || UseParallelOldGC) {
4199 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4200 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4201 }
4202 }
4203 // UseNUMAInterleaving is set to ON for all collectors and
4204 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4205 // such as the parallel collector for Linux and Solaris will
4206 // interleave old gen and survivor spaces on top of NUMA
4207 // allocation policy for the eden space.
4208 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4209 // all platforms and ParallelGC on Windows will interleave all
4210 // of the heap spaces across NUMA nodes.
4211 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4212 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4213 }
4214 }
4215 return JNI_OK;
4216 }
4218 int Arguments::PropertyList_count(SystemProperty* pl) {
4219 int count = 0;
4220 while(pl != NULL) {
4221 count++;
4222 pl = pl->next();
4223 }
4224 return count;
4225 }
4227 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4228 assert(key != NULL, "just checking");
4229 SystemProperty* prop;
4230 for (prop = pl; prop != NULL; prop = prop->next()) {
4231 if (strcmp(key, prop->key()) == 0) return prop->value();
4232 }
4233 return NULL;
4234 }
4236 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4237 int count = 0;
4238 const char* ret_val = NULL;
4240 while(pl != NULL) {
4241 if(count >= index) {
4242 ret_val = pl->key();
4243 break;
4244 }
4245 count++;
4246 pl = pl->next();
4247 }
4249 return ret_val;
4250 }
4252 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4253 int count = 0;
4254 char* ret_val = NULL;
4256 while(pl != NULL) {
4257 if(count >= index) {
4258 ret_val = pl->value();
4259 break;
4260 }
4261 count++;
4262 pl = pl->next();
4263 }
4265 return ret_val;
4266 }
4268 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4269 SystemProperty* p = *plist;
4270 if (p == NULL) {
4271 *plist = new_p;
4272 } else {
4273 while (p->next() != NULL) {
4274 p = p->next();
4275 }
4276 p->set_next(new_p);
4277 }
4278 }
4280 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4281 if (plist == NULL)
4282 return;
4284 SystemProperty* new_p = new SystemProperty(k, v, true);
4285 PropertyList_add(plist, new_p);
4286 }
4288 // This add maintains unique property key in the list.
4289 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4290 if (plist == NULL)
4291 return;
4293 // If property key exist then update with new value.
4294 SystemProperty* prop;
4295 for (prop = *plist; prop != NULL; prop = prop->next()) {
4296 if (strcmp(k, prop->key()) == 0) {
4297 if (append) {
4298 prop->append_value(v);
4299 } else {
4300 prop->set_value(v);
4301 }
4302 return;
4303 }
4304 }
4306 PropertyList_add(plist, k, v);
4307 }
4309 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4310 // Returns true if all of the source pointed by src has been copied over to
4311 // the destination buffer pointed by buf. Otherwise, returns false.
4312 // Notes:
4313 // 1. If the length (buflen) of the destination buffer excluding the
4314 // NULL terminator character is not long enough for holding the expanded
4315 // pid characters, it also returns false instead of returning the partially
4316 // expanded one.
4317 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4318 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4319 char* buf, size_t buflen) {
4320 const char* p = src;
4321 char* b = buf;
4322 const char* src_end = &src[srclen];
4323 char* buf_end = &buf[buflen - 1];
4325 while (p < src_end && b < buf_end) {
4326 if (*p == '%') {
4327 switch (*(++p)) {
4328 case '%': // "%%" ==> "%"
4329 *b++ = *p++;
4330 break;
4331 case 'p': { // "%p" ==> current process id
4332 // buf_end points to the character before the last character so
4333 // that we could write '\0' to the end of the buffer.
4334 size_t buf_sz = buf_end - b + 1;
4335 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4337 // if jio_snprintf fails or the buffer is not long enough to hold
4338 // the expanded pid, returns false.
4339 if (ret < 0 || ret >= (int)buf_sz) {
4340 return false;
4341 } else {
4342 b += ret;
4343 assert(*b == '\0', "fail in copy_expand_pid");
4344 if (p == src_end && b == buf_end + 1) {
4345 // reach the end of the buffer.
4346 return true;
4347 }
4348 }
4349 p++;
4350 break;
4351 }
4352 default :
4353 *b++ = '%';
4354 }
4355 } else {
4356 *b++ = *p++;
4357 }
4358 }
4359 *b = '\0';
4360 return (p == src_end); // return false if not all of the source was copied
4361 }