1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 // Disable options not supported in this release, with a warning if they
61 // were explicitly requested on the command-line
62 #define UNSUPPORTED_OPTION(opt, description) \
63 do { \
64 if (opt) { \
65 if (FLAG_IS_CMDLINE(opt)) { \
66 warning(description " is disabled in this release."); \
67 } \
68 FLAG_SET_DEFAULT(opt, false); \
69 } \
70 } while(0)
71
72 #define UNSUPPORTED_GC_OPTION(gc) \
73 do { \
74 if (gc) { \
75 if (FLAG_IS_CMDLINE(gc)) { \
76 warning(#gc " is not supported in this VM. Using Serial GC."); \
77 } \
78 FLAG_SET_DEFAULT(gc, false); \
79 } \
80 } while(0)
81
82 char** Arguments::_jvm_flags_array = NULL;
83 int Arguments::_num_jvm_flags = 0;
84 char** Arguments::_jvm_args_array = NULL;
85 int Arguments::_num_jvm_args = 0;
86 char* Arguments::_java_command = NULL;
87 SystemProperty* Arguments::_system_properties = NULL;
88 const char* Arguments::_gc_log_filename = NULL;
89 bool Arguments::_has_profile = false;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 uintx Arguments::_min_heap_size = 0;
92 uintx Arguments::_min_heap_free_ratio = 0;
93 uintx Arguments::_max_heap_free_ratio = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 bool Arguments::_java_compiler = false;
96 bool Arguments::_xdebug_mode = false;
97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 int Arguments::_sun_java_launcher_pid = -1;
100 bool Arguments::_sun_java_launcher_is_altjvm = false;
101
102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
105 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
106 bool Arguments::_ClipInlining = ClipInlining;
107
108 char* Arguments::SharedArchivePath = NULL;
109
110 AgentLibraryList Arguments::_libraryList;
111 AgentLibraryList Arguments::_agentList;
112
113 abort_hook_t Arguments::_abort_hook = NULL;
114 exit_hook_t Arguments::_exit_hook = NULL;
115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
116
117
118 SystemProperty *Arguments::_sun_boot_library_path = NULL;
119 SystemProperty *Arguments::_java_library_path = NULL;
120 SystemProperty *Arguments::_java_home = NULL;
121 SystemProperty *Arguments::_java_class_path = NULL;
122 SystemProperty *Arguments::_sun_boot_class_path = NULL;
123
124 char* Arguments::_meta_index_path = NULL;
125 char* Arguments::_meta_index_dir = NULL;
126 char* Arguments::_ext_dirs = NULL;
127
128 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
129
130 static bool match_option(const JavaVMOption *option, const char* name,
131 const char** tail) {
132 int len = (int)strlen(name);
133 if (strncmp(option->optionString, name, len) == 0) {
134 *tail = option->optionString + len;
135 return true;
136 } else {
137 return false;
138 }
139 }
140
141 static void logOption(const char* opt) {
142 if (PrintVMOptions) {
143 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
144 }
145 }
146
147 // Process java launcher properties.
148 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
149 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
150 // sun.java.launcher.pid is defined.
151 // Must do this before setting up other system properties,
152 // as some of them may depend on launcher type.
153 for (int index = 0; index < args->nOptions; index++) {
154 const JavaVMOption* option = args->options + index;
155 const char* tail;
156
157 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
158 process_java_launcher_argument(tail, option->extraInfo);
159 continue;
160 }
161 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
162 if (strcmp(tail, "true") == 0) {
163 _sun_java_launcher_is_altjvm = true;
164 }
165 continue;
166 }
167 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
168 _sun_java_launcher_pid = atoi(tail);
169 continue;
170 }
171 }
172 }
173
174 // Initialize system properties key and value.
175 void Arguments::init_system_properties() {
176
177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
178 "Java Virtual Machine Specification", false));
179 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
182
183 // Following are JVMTI agent writable properties.
184 // Properties values are set to NULL and they are
185 // os specific they are initialized in os::init_system_properties_values().
186 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
187 _java_library_path = new SystemProperty("java.library.path", NULL, true);
188 _java_home = new SystemProperty("java.home", NULL, true);
189 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
190
191 _java_class_path = new SystemProperty("java.class.path", "", true);
192
193 // Add to System Property list.
194 PropertyList_add(&_system_properties, _sun_boot_library_path);
195 PropertyList_add(&_system_properties, _java_library_path);
196 PropertyList_add(&_system_properties, _java_home);
197 PropertyList_add(&_system_properties, _java_class_path);
198 PropertyList_add(&_system_properties, _sun_boot_class_path);
199
200 // Set OS specific system properties values
201 os::init_system_properties_values();
202 }
203
204
205 // Update/Initialize System properties after JDK version number is known
206 void Arguments::init_version_specific_system_properties() {
207 enum { bufsz = 16 };
208 char buffer[bufsz];
209 const char* spec_vendor = "Sun Microsystems Inc.";
210 uint32_t spec_version = 0;
211
212 spec_vendor = "Oracle Corporation";
213 spec_version = JDK_Version::current().major_version();
214 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
215
216 PropertyList_add(&_system_properties,
217 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
218 PropertyList_add(&_system_properties,
219 new SystemProperty("java.vm.specification.version", buffer, false));
220 PropertyList_add(&_system_properties,
221 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
222 }
223
224 /**
225 * Provide a slightly more user-friendly way of eliminating -XX flags.
226 * When a flag is eliminated, it can be added to this list in order to
227 * continue accepting this flag on the command-line, while issuing a warning
228 * and ignoring the value. Once the JDK version reaches the 'accept_until'
229 * limit, we flatly refuse to admit the existence of the flag. This allows
230 * a flag to die correctly over JDK releases using HSX.
231 */
232 typedef struct {
233 const char* name;
234 JDK_Version obsoleted_in; // when the flag went away
235 JDK_Version accept_until; // which version to start denying the existence
236 } ObsoleteFlag;
237
238 static ObsoleteFlag obsolete_jvm_flags[] = {
239 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
240 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
241 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
242 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
243 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
244 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
253 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
254 { "DefaultInitialRAMFraction",
255 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
256 { "UseDepthFirstScavengeOrder",
257 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
258 { "HandlePromotionFailure",
259 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
260 { "MaxLiveObjectEvacuationRatio",
261 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
262 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
263 { "UseParallelOldGCCompacting",
264 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
265 { "UseParallelDensePrefixUpdate",
266 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
267 { "UseParallelOldGCDensePrefix",
268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
269 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
270 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
271 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
272 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
273 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
274 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
275 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
276 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
290 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
291 #ifdef PRODUCT
292 { "DesiredMethodLimit",
293 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
294 #endif // PRODUCT
295 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
297 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
298 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
299 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
300 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
301 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
307 #ifndef ZERO
308 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
310 #endif // ZERO
311 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { NULL, JDK_Version(0), JDK_Version(0) }
313 };
314
315 // Returns true if the flag is obsolete and fits into the range specified
316 // for being ignored. In the case that the flag is ignored, the 'version'
317 // value is filled in with the version number when the flag became
318 // obsolete so that that value can be displayed to the user.
319 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
320 int i = 0;
321 assert(version != NULL, "Must provide a version buffer");
322 while (obsolete_jvm_flags[i].name != NULL) {
323 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
324 // <flag>=xxx form
325 // [-|+]<flag> form
326 size_t len = strlen(flag_status.name);
327 if (((strncmp(flag_status.name, s, len) == 0) &&
328 (strlen(s) == len)) ||
329 ((s[0] == '+' || s[0] == '-') &&
330 (strncmp(flag_status.name, &s[1], len) == 0) &&
331 (strlen(&s[1]) == len))) {
332 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
333 *version = flag_status.obsoleted_in;
334 return true;
335 }
336 }
337 i++;
338 }
339 return false;
340 }
341
342 // Constructs the system class path (aka boot class path) from the following
343 // components, in order:
344 //
345 // prefix // from -Xbootclasspath/p:...
346 // base // from os::get_system_properties() or -Xbootclasspath=
347 // suffix // from -Xbootclasspath/a:...
348 //
349 // This could be AllStatic, but it isn't needed after argument processing is
350 // complete.
351 class SysClassPath: public StackObj {
352 public:
353 SysClassPath(const char* base);
354 ~SysClassPath();
355
356 inline void set_base(const char* base);
357 inline void add_prefix(const char* prefix);
358 inline void add_suffix_to_prefix(const char* suffix);
359 inline void add_suffix(const char* suffix);
360 inline void reset_path(const char* base);
361
362 inline const char* get_base() const { return _items[_scp_base]; }
363 inline const char* get_prefix() const { return _items[_scp_prefix]; }
364 inline const char* get_suffix() const { return _items[_scp_suffix]; }
365
366 // Combine all the components into a single c-heap-allocated string; caller
367 // must free the string if/when no longer needed.
368 char* combined_path();
369
370 private:
371 // Utility routines.
372 static char* add_to_path(const char* path, const char* str, bool prepend);
373 static char* add_jars_to_path(char* path, const char* directory);
374
375 inline void reset_item_at(int index);
376
377 // Array indices for the items that make up the sysclasspath. All except the
378 // base are allocated in the C heap and freed by this class.
379 enum {
380 _scp_prefix, // from -Xbootclasspath/p:...
381 _scp_base, // the default sysclasspath
382 _scp_suffix, // from -Xbootclasspath/a:...
383 _scp_nitems // the number of items, must be last.
384 };
385
386 const char* _items[_scp_nitems];
387 };
388
389 SysClassPath::SysClassPath(const char* base) {
390 memset(_items, 0, sizeof(_items));
391 _items[_scp_base] = base;
392 }
393
394 SysClassPath::~SysClassPath() {
395 // Free everything except the base.
396 for (int i = 0; i < _scp_nitems; ++i) {
397 if (i != _scp_base) reset_item_at(i);
398 }
399 }
400
401 inline void SysClassPath::set_base(const char* base) {
402 _items[_scp_base] = base;
403 }
404
405 inline void SysClassPath::add_prefix(const char* prefix) {
406 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
407 }
408
409 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
410 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
411 }
412
413 inline void SysClassPath::add_suffix(const char* suffix) {
414 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
415 }
416
417 inline void SysClassPath::reset_item_at(int index) {
418 assert(index < _scp_nitems && index != _scp_base, "just checking");
419 if (_items[index] != NULL) {
420 FREE_C_HEAP_ARRAY(char, _items[index]);
421 _items[index] = NULL;
422 }
423 }
424
425 inline void SysClassPath::reset_path(const char* base) {
426 // Clear the prefix and suffix.
427 reset_item_at(_scp_prefix);
428 reset_item_at(_scp_suffix);
429 set_base(base);
430 }
431
432 //------------------------------------------------------------------------------
433
434
435 // Combine the bootclasspath elements, some of which may be null, into a single
436 // c-heap-allocated string.
437 char* SysClassPath::combined_path() {
438 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
439
440 size_t lengths[_scp_nitems];
441 size_t total_len = 0;
442
443 const char separator = *os::path_separator();
444
445 // Get the lengths.
446 int i;
447 for (i = 0; i < _scp_nitems; ++i) {
448 if (_items[i] != NULL) {
449 lengths[i] = strlen(_items[i]);
450 // Include space for the separator char (or a NULL for the last item).
451 total_len += lengths[i] + 1;
452 }
453 }
454 assert(total_len > 0, "empty sysclasspath not allowed");
455
456 // Copy the _items to a single string.
457 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
458 char* cp_tmp = cp;
459 for (i = 0; i < _scp_nitems; ++i) {
460 if (_items[i] != NULL) {
461 memcpy(cp_tmp, _items[i], lengths[i]);
462 cp_tmp += lengths[i];
463 *cp_tmp++ = separator;
464 }
465 }
466 *--cp_tmp = '\0'; // Replace the extra separator.
467 return cp;
468 }
469
470 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
471 char*
472 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
473 char *cp;
474
475 assert(str != NULL, "just checking");
476 if (path == NULL) {
477 size_t len = strlen(str) + 1;
478 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
479 memcpy(cp, str, len); // copy the trailing null
480 } else {
481 const char separator = *os::path_separator();
482 size_t old_len = strlen(path);
483 size_t str_len = strlen(str);
484 size_t len = old_len + str_len + 2;
485
486 if (prepend) {
487 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
488 char* cp_tmp = cp;
489 memcpy(cp_tmp, str, str_len);
490 cp_tmp += str_len;
491 *cp_tmp = separator;
492 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
493 FREE_C_HEAP_ARRAY(char, path);
494 } else {
495 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
496 char* cp_tmp = cp + old_len;
497 *cp_tmp = separator;
498 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
499 }
500 }
501 return cp;
502 }
503
504 // Scan the directory and append any jar or zip files found to path.
505 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
506 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
507 DIR* dir = os::opendir(directory);
508 if (dir == NULL) return path;
509
510 char dir_sep[2] = { '\0', '\0' };
511 size_t directory_len = strlen(directory);
512 const char fileSep = *os::file_separator();
513 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
514
515 /* Scan the directory for jars/zips, appending them to path. */
516 struct dirent *entry;
517 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
518 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
519 const char* name = entry->d_name;
520 const char* ext = name + strlen(name) - 4;
521 bool isJarOrZip = ext > name &&
522 (os::file_name_strcmp(ext, ".jar") == 0 ||
523 os::file_name_strcmp(ext, ".zip") == 0);
524 if (isJarOrZip) {
525 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
526 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
527 path = add_to_path(path, jarpath, false);
528 FREE_C_HEAP_ARRAY(char, jarpath);
529 }
530 }
531 FREE_C_HEAP_ARRAY(char, dbuf);
532 os::closedir(dir);
533 return path;
534 }
535
536 // Parses a memory size specification string.
537 static bool atomull(const char *s, julong* result) {
538 julong n = 0;
539 int args_read = 0;
540 bool is_hex = false;
541 // Skip leading 0[xX] for hexadecimal
542 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
543 s += 2;
544 is_hex = true;
545 args_read = sscanf(s, JULONG_FORMAT_X, &n);
546 } else {
547 args_read = sscanf(s, JULONG_FORMAT, &n);
548 }
549 if (args_read != 1) {
550 return false;
551 }
552 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
553 s++;
554 }
555 // 4705540: illegal if more characters are found after the first non-digit
556 if (strlen(s) > 1) {
557 return false;
558 }
559 switch (*s) {
560 case 'T': case 't':
561 *result = n * G * K;
562 // Check for overflow.
563 if (*result/((julong)G * K) != n) return false;
564 return true;
565 case 'G': case 'g':
566 *result = n * G;
567 if (*result/G != n) return false;
568 return true;
569 case 'M': case 'm':
570 *result = n * M;
571 if (*result/M != n) return false;
572 return true;
573 case 'K': case 'k':
574 *result = n * K;
575 if (*result/K != n) return false;
576 return true;
577 case '\0':
578 *result = n;
579 return true;
580 default:
581 return false;
582 }
583 }
584
585 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
586 if (size < min_size) return arg_too_small;
587 // Check that size will fit in a size_t (only relevant on 32-bit)
588 if (size > max_uintx) return arg_too_big;
589 return arg_in_range;
590 }
591
592 // Describe an argument out of range error
593 void Arguments::describe_range_error(ArgsRange errcode) {
594 switch(errcode) {
595 case arg_too_big:
596 jio_fprintf(defaultStream::error_stream(),
597 "The specified size exceeds the maximum "
598 "representable size.\n");
599 break;
600 case arg_too_small:
601 case arg_unreadable:
602 case arg_in_range:
603 // do nothing for now
604 break;
605 default:
606 ShouldNotReachHere();
607 }
608 }
609
610 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
611 return CommandLineFlags::boolAtPut(name, &value, origin);
612 }
613
614 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
615 double v;
616 if (sscanf(value, "%lf", &v) != 1) {
617 return false;
618 }
619
620 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
621 return true;
622 }
623 return false;
624 }
625
626 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
627 julong v;
628 intx intx_v;
629 bool is_neg = false;
630 // Check the sign first since atomull() parses only unsigned values.
631 if (*value == '-') {
632 if (!CommandLineFlags::intxAt(name, &intx_v)) {
633 return false;
634 }
635 value++;
636 is_neg = true;
637 }
638 if (!atomull(value, &v)) {
639 return false;
640 }
641 intx_v = (intx) v;
642 if (is_neg) {
643 intx_v = -intx_v;
644 }
645 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
646 return true;
647 }
648 uintx uintx_v = (uintx) v;
649 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
650 return true;
651 }
652 uint64_t uint64_t_v = (uint64_t) v;
653 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
654 return true;
655 }
656 size_t size_t_v = (size_t) v;
657 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
658 return true;
659 }
660 return false;
661 }
662
663 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
664 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
665 // Contract: CommandLineFlags always returns a pointer that needs freeing.
666 FREE_C_HEAP_ARRAY(char, value);
667 return true;
668 }
669
670 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
671 const char* old_value = "";
672 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
673 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
674 size_t new_len = strlen(new_value);
675 const char* value;
676 char* free_this_too = NULL;
677 if (old_len == 0) {
678 value = new_value;
679 } else if (new_len == 0) {
680 value = old_value;
681 } else {
682 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
683 // each new setting adds another LINE to the switch:
684 sprintf(buf, "%s\n%s", old_value, new_value);
685 value = buf;
686 free_this_too = buf;
687 }
688 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
689 // CommandLineFlags always returns a pointer that needs freeing.
690 FREE_C_HEAP_ARRAY(char, value);
691 if (free_this_too != NULL) {
692 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
693 FREE_C_HEAP_ARRAY(char, free_this_too);
694 }
695 return true;
696 }
697
698 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
699
700 // range of acceptable characters spelled out for portability reasons
701 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
702 #define BUFLEN 255
703 char name[BUFLEN+1];
704 char dummy;
705
706 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
707 return set_bool_flag(name, false, origin);
708 }
709 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
710 return set_bool_flag(name, true, origin);
711 }
712
713 char punct;
714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
715 const char* value = strchr(arg, '=') + 1;
716 Flag* flag = Flag::find_flag(name, strlen(name));
717 if (flag != NULL && flag->is_ccstr()) {
718 if (flag->ccstr_accumulates()) {
719 return append_to_string_flag(name, value, origin);
720 } else {
721 if (value[0] == '\0') {
722 value = NULL;
723 }
724 return set_string_flag(name, value, origin);
725 }
726 }
727 }
728
729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
730 const char* value = strchr(arg, '=') + 1;
731 // -XX:Foo:=xxx will reset the string flag to the given value.
732 if (value[0] == '\0') {
733 value = NULL;
734 }
735 return set_string_flag(name, value, origin);
736 }
737
738 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
739 #define SIGNED_NUMBER_RANGE "[-0123456789]"
740 #define NUMBER_RANGE "[0123456789]"
741 char value[BUFLEN + 1];
742 char value2[BUFLEN + 1];
743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
744 // Looks like a floating-point number -- try again with more lenient format string
745 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
746 return set_fp_numeric_flag(name, value, origin);
747 }
748 }
749
750 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
751 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
752 return set_numeric_flag(name, value, origin);
753 }
754
755 return false;
756 }
757
758 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
759 assert(bldarray != NULL, "illegal argument");
760
761 if (arg == NULL) {
762 return;
763 }
764
765 int new_count = *count + 1;
766
767 // expand the array and add arg to the last element
768 if (*bldarray == NULL) {
769 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
770 } else {
771 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
772 }
773 (*bldarray)[*count] = os::strdup_check_oom(arg);
774 *count = new_count;
775 }
776
777 void Arguments::build_jvm_args(const char* arg) {
778 add_string(&_jvm_args_array, &_num_jvm_args, arg);
779 }
780
781 void Arguments::build_jvm_flags(const char* arg) {
782 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
783 }
784
785 // utility function to return a string that concatenates all
786 // strings in a given char** array
787 const char* Arguments::build_resource_string(char** args, int count) {
788 if (args == NULL || count == 0) {
789 return NULL;
790 }
791 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
792 for (int i = 1; i < count; i++) {
793 length += strlen(args[i]) + 1; // add 1 for a space
794 }
795 char* s = NEW_RESOURCE_ARRAY(char, length);
796 strcpy(s, args[0]);
797 for (int j = 1; j < count; j++) {
798 strcat(s, " ");
799 strcat(s, args[j]);
800 }
801 return (const char*) s;
802 }
803
804 void Arguments::print_on(outputStream* st) {
805 st->print_cr("VM Arguments:");
806 if (num_jvm_flags() > 0) {
807 st->print("jvm_flags: "); print_jvm_flags_on(st);
808 }
809 if (num_jvm_args() > 0) {
810 st->print("jvm_args: "); print_jvm_args_on(st);
811 }
812 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
813 if (_java_class_path != NULL) {
814 char* path = _java_class_path->value();
815 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
816 }
817 st->print_cr("Launcher Type: %s", _sun_java_launcher);
818 }
819
820 void Arguments::print_jvm_flags_on(outputStream* st) {
821 if (_num_jvm_flags > 0) {
822 for (int i=0; i < _num_jvm_flags; i++) {
823 st->print("%s ", _jvm_flags_array[i]);
824 }
825 st->cr();
826 }
827 }
828
829 void Arguments::print_jvm_args_on(outputStream* st) {
830 if (_num_jvm_args > 0) {
831 for (int i=0; i < _num_jvm_args; i++) {
832 st->print("%s ", _jvm_args_array[i]);
833 }
834 st->cr();
835 }
836 }
837
838 bool Arguments::process_argument(const char* arg,
839 jboolean ignore_unrecognized, Flag::Flags origin) {
840
841 JDK_Version since = JDK_Version();
842
843 if (parse_argument(arg, origin) || ignore_unrecognized) {
844 return true;
845 }
846
847 bool has_plus_minus = (*arg == '+' || *arg == '-');
848 const char* const argname = has_plus_minus ? arg + 1 : arg;
849 if (is_newly_obsolete(arg, &since)) {
850 char version[256];
851 since.to_string(version, sizeof(version));
852 warning("ignoring option %s; support was removed in %s", argname, version);
853 return true;
854 }
855
856 // For locked flags, report a custom error message if available.
857 // Otherwise, report the standard unrecognized VM option.
858
859 size_t arg_len;
860 const char* equal_sign = strchr(argname, '=');
861 if (equal_sign == NULL) {
862 arg_len = strlen(argname);
863 } else {
864 arg_len = equal_sign - argname;
865 }
866
867 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
868 if (found_flag != NULL) {
869 char locked_message_buf[BUFLEN];
870 found_flag->get_locked_message(locked_message_buf, BUFLEN);
871 if (strlen(locked_message_buf) == 0) {
872 if (found_flag->is_bool() && !has_plus_minus) {
873 jio_fprintf(defaultStream::error_stream(),
874 "Missing +/- setting for VM option '%s'\n", argname);
875 } else if (!found_flag->is_bool() && has_plus_minus) {
876 jio_fprintf(defaultStream::error_stream(),
877 "Unexpected +/- setting in VM option '%s'\n", argname);
878 } else {
879 jio_fprintf(defaultStream::error_stream(),
880 "Improperly specified VM option '%s'\n", argname);
881 }
882 } else {
883 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
884 }
885 } else {
886 jio_fprintf(defaultStream::error_stream(),
887 "Unrecognized VM option '%s'\n", argname);
888 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
889 if (fuzzy_matched != NULL) {
890 jio_fprintf(defaultStream::error_stream(),
891 "Did you mean '%s%s%s'? ",
892 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
893 fuzzy_matched->_name,
894 (fuzzy_matched->is_bool()) ? "" : "=<value>");
895 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
896 char version[256];
897 since.to_string(version, sizeof(version));
898 jio_fprintf(defaultStream::error_stream(),
899 "Warning: support for %s was removed in %s\n",
900 fuzzy_matched->_name,
901 version);
902 }
903 }
904 }
905
906 // allow for commandline "commenting out" options like -XX:#+Verbose
907 return arg[0] == '#';
908 }
909
910 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
911 FILE* stream = fopen(file_name, "rb");
912 if (stream == NULL) {
913 if (should_exist) {
914 jio_fprintf(defaultStream::error_stream(),
915 "Could not open settings file %s\n", file_name);
916 return false;
917 } else {
918 return true;
919 }
920 }
921
922 char token[1024];
923 int pos = 0;
924
925 bool in_white_space = true;
926 bool in_comment = false;
927 bool in_quote = false;
928 char quote_c = 0;
929 bool result = true;
930
931 int c = getc(stream);
932 while(c != EOF && pos < (int)(sizeof(token)-1)) {
933 if (in_white_space) {
934 if (in_comment) {
935 if (c == '\n') in_comment = false;
936 } else {
937 if (c == '#') in_comment = true;
938 else if (!isspace(c)) {
939 in_white_space = false;
940 token[pos++] = c;
941 }
942 }
943 } else {
944 if (c == '\n' || (!in_quote && isspace(c))) {
945 // token ends at newline, or at unquoted whitespace
946 // this allows a way to include spaces in string-valued options
947 token[pos] = '\0';
948 logOption(token);
949 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
950 build_jvm_flags(token);
951 pos = 0;
952 in_white_space = true;
953 in_quote = false;
954 } else if (!in_quote && (c == '\'' || c == '"')) {
955 in_quote = true;
956 quote_c = c;
957 } else if (in_quote && (c == quote_c)) {
958 in_quote = false;
959 } else {
960 token[pos++] = c;
961 }
962 }
963 c = getc(stream);
964 }
965 if (pos > 0) {
966 token[pos] = '\0';
967 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
968 build_jvm_flags(token);
969 }
970 fclose(stream);
971 return result;
972 }
973
974 //=============================================================================================================
975 // Parsing of properties (-D)
976
977 const char* Arguments::get_property(const char* key) {
978 return PropertyList_get_value(system_properties(), key);
979 }
980
981 bool Arguments::add_property(const char* prop) {
982 const char* eq = strchr(prop, '=');
983 char* key;
984 // ns must be static--its address may be stored in a SystemProperty object.
985 const static char ns[1] = {0};
986 char* value = (char *)ns;
987
988 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
989 key = AllocateHeap(key_len + 1, mtInternal);
990 strncpy(key, prop, key_len);
991 key[key_len] = '\0';
992
993 if (eq != NULL) {
994 size_t value_len = strlen(prop) - key_len - 1;
995 value = AllocateHeap(value_len + 1, mtInternal);
996 strncpy(value, &prop[key_len + 1], value_len + 1);
997 }
998
999 if (strcmp(key, "java.compiler") == 0) {
1000 process_java_compiler_argument(value);
1001 FreeHeap(key);
1002 if (eq != NULL) {
1003 FreeHeap(value);
1004 }
1005 return true;
1006 } else if (strcmp(key, "sun.java.command") == 0) {
1007 _java_command = value;
1008
1009 // Record value in Arguments, but let it get passed to Java.
1010 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1011 strcmp(key, "sun.java.launcher.pid") == 0) {
1012 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1013 // private and are processed in process_sun_java_launcher_properties();
1014 // the sun.java.launcher property is passed on to the java application
1015 FreeHeap(key);
1016 if (eq != NULL) {
1017 FreeHeap(value);
1018 }
1019 return true;
1020 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1021 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1022 // its value without going through the property list or making a Java call.
1023 _java_vendor_url_bug = value;
1024 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1025 PropertyList_unique_add(&_system_properties, key, value, true);
1026 return true;
1027 }
1028 // Create new property and add at the end of the list
1029 PropertyList_unique_add(&_system_properties, key, value);
1030 return true;
1031 }
1032
1033 //===========================================================================================================
1034 // Setting int/mixed/comp mode flags
1035
1036 void Arguments::set_mode_flags(Mode mode) {
1037 // Set up default values for all flags.
1038 // If you add a flag to any of the branches below,
1039 // add a default value for it here.
1040 set_java_compiler(false);
1041 _mode = mode;
1042
1043 // Ensure Agent_OnLoad has the correct initial values.
1044 // This may not be the final mode; mode may change later in onload phase.
1045 PropertyList_unique_add(&_system_properties, "java.vm.info",
1046 (char*)VM_Version::vm_info_string(), false);
1047
1048 UseInterpreter = true;
1049 UseCompiler = true;
1050 UseLoopCounter = true;
1051
1052 // Default values may be platform/compiler dependent -
1053 // use the saved values
1054 ClipInlining = Arguments::_ClipInlining;
1055 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1056 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1057 BackgroundCompilation = Arguments::_BackgroundCompilation;
1058
1059 // Change from defaults based on mode
1060 switch (mode) {
1061 default:
1062 ShouldNotReachHere();
1063 break;
1064 case _int:
1065 UseCompiler = false;
1066 UseLoopCounter = false;
1067 AlwaysCompileLoopMethods = false;
1068 UseOnStackReplacement = false;
1069 break;
1070 case _mixed:
1071 // same as default
1072 break;
1073 case _comp:
1074 UseInterpreter = false;
1075 BackgroundCompilation = false;
1076 ClipInlining = false;
1077 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1078 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1079 // compile a level 4 (C2) and then continue executing it.
1080 if (TieredCompilation) {
1081 Tier3InvokeNotifyFreqLog = 0;
1082 Tier4InvocationThreshold = 0;
1083 }
1084 break;
1085 }
1086 }
1087
1088 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1089 // Conflict: required to use shared spaces (-Xshare:on), but
1090 // incompatible command line options were chosen.
1091
1092 static void no_shared_spaces(const char* message) {
1093 if (RequireSharedSpaces) {
1094 jio_fprintf(defaultStream::error_stream(),
1095 "Class data sharing is inconsistent with other specified options.\n");
1096 vm_exit_during_initialization("Unable to use shared archive.", message);
1097 } else {
1098 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1099 }
1100 }
1101 #endif
1102
1103 // Returns threshold scaled with CompileThresholdScaling
1104 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1105 return (intx)(threshold * CompileThresholdScaling);
1106 }
1107
1108 // Returns freq_log scaled with CompileThresholdScaling
1109 intx Arguments::get_scaled_freq_log(intx freq_log) {
1110 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1111 if (scaled_freq == 0) {
1112 return 0;
1113 } else {
1114 return log2_intptr(scaled_freq);
1115 }
1116 }
1117
1118 void Arguments::set_tiered_flags() {
1119 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1120 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1121 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1122 }
1123 if (CompilationPolicyChoice < 2) {
1124 vm_exit_during_initialization(
1125 "Incompatible compilation policy selected", NULL);
1126 }
1127 // Increase the code cache size - tiered compiles a lot more.
1128 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1129 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1130 }
1131 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1132 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1133 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1134
1135 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1136 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1137 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1138 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1139 }
1140 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1141 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1142 }
1143 // Check consistency of code heap sizes
1144 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1145 jio_fprintf(defaultStream::error_stream(),
1146 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1147 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1148 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1149 vm_exit(1);
1150 }
1151 }
1152 }
1153 if (!UseInterpreter) { // -Xcomp
1154 Tier3InvokeNotifyFreqLog = 0;
1155 Tier4InvocationThreshold = 0;
1156 }
1157 // Scale tiered compilation thresholds
1158 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1159 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1160 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1161
1162 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1163 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1164 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1165 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1166
1167 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1168 // once these thresholds become supported.
1169
1170 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1171 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1172
1173 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1174 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1175
1176 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1177
1178 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1179 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1180 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1181 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1182 }
1183 }
1184
1185 /**
1186 * Returns the minimum number of compiler threads needed to run the JVM. The following
1187 * configurations are possible.
1188 *
1189 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1190 * compiler threads is 0.
1191 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1192 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1193 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1194 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1195 * C1 can be used, so the minimum number of compiler threads is 1.
1196 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1197 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1198 * the minimum number of compiler threads is 2.
1199 */
1200 int Arguments::get_min_number_of_compiler_threads() {
1201 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1202 return 0; // case 1
1203 #else
1204 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1205 return 1; // case 2 or case 3
1206 }
1207 return 2; // case 4 (tiered)
1208 #endif
1209 }
1210
1211 #if INCLUDE_ALL_GCS
1212 static void disable_adaptive_size_policy(const char* collector_name) {
1213 if (UseAdaptiveSizePolicy) {
1214 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1215 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1216 collector_name);
1217 }
1218 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1219 }
1220 }
1221
1222 void Arguments::set_parnew_gc_flags() {
1223 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1224 "control point invariant");
1225 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1226 assert(UseParNewGC, "ParNew should always be used with CMS");
1227
1228 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1229 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1230 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1231 } else if (ParallelGCThreads == 0) {
1232 jio_fprintf(defaultStream::error_stream(),
1233 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1234 vm_exit(1);
1235 }
1236
1237 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1238 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1239 // we set them to 1024 and 1024.
1240 // See CR 6362902.
1241 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1242 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1243 }
1244 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1245 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1246 }
1247
1248 // When using compressed oops, we use local overflow stacks,
1249 // rather than using a global overflow list chained through
1250 // the klass word of the object's pre-image.
1251 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1252 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1253 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1254 }
1255 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1256 }
1257 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1258 }
1259
1260 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1261 // sparc/solaris for certain applications, but would gain from
1262 // further optimization and tuning efforts, and would almost
1263 // certainly gain from analysis of platform and environment.
1264 void Arguments::set_cms_and_parnew_gc_flags() {
1265 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1266 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1267 assert(UseParNewGC, "ParNew should always be used with CMS");
1268
1269 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1270 disable_adaptive_size_policy("UseConcMarkSweepGC");
1271
1272 set_parnew_gc_flags();
1273
1274 size_t max_heap = align_size_down(MaxHeapSize,
1275 CardTableRS::ct_max_alignment_constraint());
1276
1277 // Now make adjustments for CMS
1278 intx tenuring_default = (intx)6;
1279 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1280
1281 // Preferred young gen size for "short" pauses:
1282 // upper bound depends on # of threads and NewRatio.
1283 const uintx parallel_gc_threads =
1284 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1285 const size_t preferred_max_new_size_unaligned =
1286 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1287 size_t preferred_max_new_size =
1288 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1289
1290 // Unless explicitly requested otherwise, size young gen
1291 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1292
1293 // If either MaxNewSize or NewRatio is set on the command line,
1294 // assume the user is trying to set the size of the young gen.
1295 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1296
1297 // Set MaxNewSize to our calculated preferred_max_new_size unless
1298 // NewSize was set on the command line and it is larger than
1299 // preferred_max_new_size.
1300 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1301 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1302 } else {
1303 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1304 }
1305 if (PrintGCDetails && Verbose) {
1306 // Too early to use gclog_or_tty
1307 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1308 }
1309
1310 // Code along this path potentially sets NewSize and OldSize
1311 if (PrintGCDetails && Verbose) {
1312 // Too early to use gclog_or_tty
1313 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1314 " initial_heap_size: " SIZE_FORMAT
1315 " max_heap: " SIZE_FORMAT,
1316 min_heap_size(), InitialHeapSize, max_heap);
1317 }
1318 size_t min_new = preferred_max_new_size;
1319 if (FLAG_IS_CMDLINE(NewSize)) {
1320 min_new = NewSize;
1321 }
1322 if (max_heap > min_new && min_heap_size() > min_new) {
1323 // Unless explicitly requested otherwise, make young gen
1324 // at least min_new, and at most preferred_max_new_size.
1325 if (FLAG_IS_DEFAULT(NewSize)) {
1326 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1327 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1328 if (PrintGCDetails && Verbose) {
1329 // Too early to use gclog_or_tty
1330 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1331 }
1332 }
1333 // Unless explicitly requested otherwise, size old gen
1334 // so it's NewRatio x of NewSize.
1335 if (FLAG_IS_DEFAULT(OldSize)) {
1336 if (max_heap > NewSize) {
1337 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1338 if (PrintGCDetails && Verbose) {
1339 // Too early to use gclog_or_tty
1340 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1341 }
1342 }
1343 }
1344 }
1345 }
1346 // Unless explicitly requested otherwise, definitely
1347 // promote all objects surviving "tenuring_default" scavenges.
1348 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1349 FLAG_IS_DEFAULT(SurvivorRatio)) {
1350 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1351 }
1352 // If we decided above (or user explicitly requested)
1353 // `promote all' (via MaxTenuringThreshold := 0),
1354 // prefer minuscule survivor spaces so as not to waste
1355 // space for (non-existent) survivors
1356 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1357 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1358 }
1359 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1360 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1361 // This is done in order to make ParNew+CMS configuration to work
1362 // with YoungPLABSize and OldPLABSize options.
1363 // See CR 6362902.
1364 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1365 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1366 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1367 // is. In this situation let CMSParPromoteBlocksToClaim follow
1368 // the value (either from the command line or ergonomics) of
1369 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1370 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1371 } else {
1372 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1373 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1374 // we'll let it to take precedence.
1375 jio_fprintf(defaultStream::error_stream(),
1376 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1377 " options are specified for the CMS collector."
1378 " CMSParPromoteBlocksToClaim will take precedence.\n");
1379 }
1380 }
1381 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1382 // OldPLAB sizing manually turned off: Use a larger default setting,
1383 // unless it was manually specified. This is because a too-low value
1384 // will slow down scavenges.
1385 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1386 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1387 }
1388 }
1389 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1390 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1391 // If either of the static initialization defaults have changed, note this
1392 // modification.
1393 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1394 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1395 }
1396 if (PrintGCDetails && Verbose) {
1397 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1398 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1399 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1400 }
1401 }
1402 #endif // INCLUDE_ALL_GCS
1403
1404 void set_object_alignment() {
1405 // Object alignment.
1406 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1407 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1408 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1409 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1410 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1411 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1412
1413 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1414 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1415
1416 // Oop encoding heap max
1417 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1418
1419 #if INCLUDE_ALL_GCS
1420 // Set CMS global values
1421 CompactibleFreeListSpace::set_cms_values();
1422 #endif // INCLUDE_ALL_GCS
1423 }
1424
1425 bool verify_object_alignment() {
1426 // Object alignment.
1427 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1428 jio_fprintf(defaultStream::error_stream(),
1429 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1430 (int)ObjectAlignmentInBytes);
1431 return false;
1432 }
1433 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1434 jio_fprintf(defaultStream::error_stream(),
1435 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1436 (int)ObjectAlignmentInBytes, BytesPerLong);
1437 return false;
1438 }
1439 // It does not make sense to have big object alignment
1440 // since a space lost due to alignment will be greater
1441 // then a saved space from compressed oops.
1442 if ((int)ObjectAlignmentInBytes > 256) {
1443 jio_fprintf(defaultStream::error_stream(),
1444 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1445 (int)ObjectAlignmentInBytes);
1446 return false;
1447 }
1448 // In case page size is very small.
1449 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1450 jio_fprintf(defaultStream::error_stream(),
1451 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1452 (int)ObjectAlignmentInBytes, os::vm_page_size());
1453 return false;
1454 }
1455 if(SurvivorAlignmentInBytes == 0) {
1456 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1457 } else {
1458 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1459 jio_fprintf(defaultStream::error_stream(),
1460 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1461 (int)SurvivorAlignmentInBytes);
1462 return false;
1463 }
1464 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1465 jio_fprintf(defaultStream::error_stream(),
1466 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1467 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1468 return false;
1469 }
1470 }
1471 return true;
1472 }
1473
1474 size_t Arguments::max_heap_for_compressed_oops() {
1475 // Avoid sign flip.
1476 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1477 // We need to fit both the NULL page and the heap into the memory budget, while
1478 // keeping alignment constraints of the heap. To guarantee the latter, as the
1479 // NULL page is located before the heap, we pad the NULL page to the conservative
1480 // maximum alignment that the GC may ever impose upon the heap.
1481 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1482 _conservative_max_heap_alignment);
1483
1484 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1485 NOT_LP64(ShouldNotReachHere(); return 0);
1486 }
1487
1488 bool Arguments::should_auto_select_low_pause_collector() {
1489 if (UseAutoGCSelectPolicy &&
1490 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1491 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1492 if (PrintGCDetails) {
1493 // Cannot use gclog_or_tty yet.
1494 tty->print_cr("Automatic selection of the low pause collector"
1495 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1496 }
1497 return true;
1498 }
1499 return false;
1500 }
1501
1502 void Arguments::set_use_compressed_oops() {
1503 #ifndef ZERO
1504 #ifdef _LP64
1505 // MaxHeapSize is not set up properly at this point, but
1506 // the only value that can override MaxHeapSize if we are
1507 // to use UseCompressedOops is InitialHeapSize.
1508 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1509
1510 if (max_heap_size <= max_heap_for_compressed_oops()) {
1511 #if !defined(COMPILER1) || defined(TIERED)
1512 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1513 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1514 }
1515 #endif
1516 #ifdef _WIN64
1517 if (UseLargePages && UseCompressedOops) {
1518 // Cannot allocate guard pages for implicit checks in indexed addressing
1519 // mode, when large pages are specified on windows.
1520 // This flag could be switched ON if narrow oop base address is set to 0,
1521 // see code in Universe::initialize_heap().
1522 Universe::set_narrow_oop_use_implicit_null_checks(false);
1523 }
1524 #endif // _WIN64
1525 } else {
1526 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1527 warning("Max heap size too large for Compressed Oops");
1528 FLAG_SET_DEFAULT(UseCompressedOops, false);
1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1530 }
1531 }
1532 #endif // _LP64
1533 #endif // ZERO
1534 }
1535
1536
1537 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1538 // set_use_compressed_oops().
1539 void Arguments::set_use_compressed_klass_ptrs() {
1540 #ifndef ZERO
1541 #ifdef _LP64
1542 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1543 if (!UseCompressedOops) {
1544 if (UseCompressedClassPointers) {
1545 warning("UseCompressedClassPointers requires UseCompressedOops");
1546 }
1547 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1548 } else {
1549 // Turn on UseCompressedClassPointers too
1550 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1551 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1552 }
1553 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1554 if (UseCompressedClassPointers) {
1555 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1556 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1557 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1558 }
1559 }
1560 }
1561 #endif // _LP64
1562 #endif // !ZERO
1563 }
1564
1565 void Arguments::set_conservative_max_heap_alignment() {
1566 // The conservative maximum required alignment for the heap is the maximum of
1567 // the alignments imposed by several sources: any requirements from the heap
1568 // itself, the collector policy and the maximum page size we may run the VM
1569 // with.
1570 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1571 #if INCLUDE_ALL_GCS
1572 if (UseParallelGC) {
1573 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1574 } else if (UseG1GC) {
1575 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1576 }
1577 #endif // INCLUDE_ALL_GCS
1578 _conservative_max_heap_alignment = MAX4(heap_alignment,
1579 (size_t)os::vm_allocation_granularity(),
1580 os::max_page_size(),
1581 CollectorPolicy::compute_heap_alignment());
1582 }
1583
1584 void Arguments::select_gc_ergonomically() {
1585 if (os::is_server_class_machine()) {
1586 if (should_auto_select_low_pause_collector()) {
1587 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1588 } else {
1589 FLAG_SET_ERGO(bool, UseParallelGC, true);
1590 }
1591 }
1592 }
1593
1594 void Arguments::select_gc() {
1595 if (!gc_selected()) {
1596 ArgumentsExt::select_gc_ergonomically();
1597 }
1598 }
1599
1600 void Arguments::set_ergonomics_flags() {
1601 select_gc();
1602
1603 #ifdef COMPILER2
1604 // Shared spaces work fine with other GCs but causes bytecode rewriting
1605 // to be disabled, which hurts interpreter performance and decreases
1606 // server performance. When -server is specified, keep the default off
1607 // unless it is asked for. Future work: either add bytecode rewriting
1608 // at link time, or rewrite bytecodes in non-shared methods.
1609 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1610 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1611 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1612 }
1613 #endif
1614
1615 set_conservative_max_heap_alignment();
1616
1617 #ifndef ZERO
1618 #ifdef _LP64
1619 set_use_compressed_oops();
1620
1621 // set_use_compressed_klass_ptrs() must be called after calling
1622 // set_use_compressed_oops().
1623 set_use_compressed_klass_ptrs();
1624
1625 // Also checks that certain machines are slower with compressed oops
1626 // in vm_version initialization code.
1627 #endif // _LP64
1628 #endif // !ZERO
1629 }
1630
1631 void Arguments::set_parallel_gc_flags() {
1632 assert(UseParallelGC || UseParallelOldGC, "Error");
1633 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1634 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1635 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1636 }
1637 FLAG_SET_DEFAULT(UseParallelGC, true);
1638
1639 // If no heap maximum was requested explicitly, use some reasonable fraction
1640 // of the physical memory, up to a maximum of 1GB.
1641 FLAG_SET_DEFAULT(ParallelGCThreads,
1642 Abstract_VM_Version::parallel_worker_threads());
1643 if (ParallelGCThreads == 0) {
1644 jio_fprintf(defaultStream::error_stream(),
1645 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1646 vm_exit(1);
1647 }
1648
1649 if (UseAdaptiveSizePolicy) {
1650 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1651 // unless the user actually sets these flags.
1652 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1653 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1654 _min_heap_free_ratio = MinHeapFreeRatio;
1655 }
1656 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1657 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1658 _max_heap_free_ratio = MaxHeapFreeRatio;
1659 }
1660 }
1661
1662 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1663 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1664 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1665 // See CR 6362902 for details.
1666 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1667 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1668 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1669 }
1670 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1671 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1672 }
1673 }
1674
1675 if (UseParallelOldGC) {
1676 // Par compact uses lower default values since they are treated as
1677 // minimums. These are different defaults because of the different
1678 // interpretation and are not ergonomically set.
1679 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1680 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1681 }
1682 }
1683 }
1684
1685 void Arguments::set_g1_gc_flags() {
1686 assert(UseG1GC, "Error");
1687 #ifdef COMPILER1
1688 FastTLABRefill = false;
1689 #endif
1690 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1691 if (ParallelGCThreads == 0) {
1692 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1693 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1694 }
1695
1696 #if INCLUDE_ALL_GCS
1697 if (G1ConcRefinementThreads == 0) {
1698 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1699 }
1700 #endif
1701
1702 // MarkStackSize will be set (if it hasn't been set by the user)
1703 // when concurrent marking is initialized.
1704 // Its value will be based upon the number of parallel marking threads.
1705 // But we do set the maximum mark stack size here.
1706 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1707 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1708 }
1709
1710 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1711 // In G1, we want the default GC overhead goal to be higher than
1712 // say in PS. So we set it here to 10%. Otherwise the heap might
1713 // be expanded more aggressively than we would like it to. In
1714 // fact, even 10% seems to not be high enough in some cases
1715 // (especially small GC stress tests that the main thing they do
1716 // is allocation). We might consider increase it further.
1717 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1718 }
1719
1720 if (PrintGCDetails && Verbose) {
1721 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1722 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1723 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1724 }
1725 }
1726
1727 #if !INCLUDE_ALL_GCS
1728 #ifdef ASSERT
1729 static bool verify_serial_gc_flags() {
1730 return (UseSerialGC &&
1731 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1732 UseParallelGC || UseParallelOldGC));
1733 }
1734 #endif // ASSERT
1735 #endif // INCLUDE_ALL_GCS
1736
1737 void Arguments::set_gc_specific_flags() {
1738 #if INCLUDE_ALL_GCS
1739 // Set per-collector flags
1740 if (UseParallelGC || UseParallelOldGC) {
1741 set_parallel_gc_flags();
1742 } else if (UseConcMarkSweepGC) {
1743 set_cms_and_parnew_gc_flags();
1744 } else if (UseG1GC) {
1745 set_g1_gc_flags();
1746 }
1747 check_deprecated_gc_flags();
1748 if (AssumeMP && !UseSerialGC) {
1749 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1750 warning("If the number of processors is expected to increase from one, then"
1751 " you should configure the number of parallel GC threads appropriately"
1752 " using -XX:ParallelGCThreads=N");
1753 }
1754 }
1755 if (MinHeapFreeRatio == 100) {
1756 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1757 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1758 }
1759 #else // INCLUDE_ALL_GCS
1760 assert(verify_serial_gc_flags(), "SerialGC unset");
1761 #endif // INCLUDE_ALL_GCS
1762 }
1763
1764 julong Arguments::limit_by_allocatable_memory(julong limit) {
1765 julong max_allocatable;
1766 julong result = limit;
1767 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1768 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1769 }
1770 return result;
1771 }
1772
1773 // Use static initialization to get the default before parsing
1774 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1775
1776 void Arguments::set_heap_size() {
1777 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1778 // Deprecated flag
1779 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1780 }
1781
1782 const julong phys_mem =
1783 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1784 : (julong)MaxRAM;
1785
1786 // If the maximum heap size has not been set with -Xmx,
1787 // then set it as fraction of the size of physical memory,
1788 // respecting the maximum and minimum sizes of the heap.
1789 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1790 julong reasonable_max = phys_mem / MaxRAMFraction;
1791
1792 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1793 // Small physical memory, so use a minimum fraction of it for the heap
1794 reasonable_max = phys_mem / MinRAMFraction;
1795 } else {
1796 // Not-small physical memory, so require a heap at least
1797 // as large as MaxHeapSize
1798 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1799 }
1800 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1801 // Limit the heap size to ErgoHeapSizeLimit
1802 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1803 }
1804 if (UseCompressedOops) {
1805 // Limit the heap size to the maximum possible when using compressed oops
1806 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1807
1808 // HeapBaseMinAddress can be greater than default but not less than.
1809 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1810 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1811 // matches compressed oops printing flags
1812 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1813 jio_fprintf(defaultStream::error_stream(),
1814 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1815 " (" UINTX_FORMAT "G) which is greater than value given "
1816 UINTX_FORMAT "\n",
1817 DefaultHeapBaseMinAddress,
1818 DefaultHeapBaseMinAddress/G,
1819 HeapBaseMinAddress);
1820 }
1821 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1822 }
1823 }
1824
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);
1833
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 }
1841
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 }
1848
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);
1853
1854 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1855
1856 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1857
1858 if (InitialHeapSize == 0) {
1859 julong reasonable_initial = phys_mem / InitialRAMFraction;
1860
1861 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1862 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1863
1864 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1865
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 }
1883
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 }
1892
1893 if (!RewriteBytecodes) {
1894 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1895 }
1896 }
1897
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 }
1922
1923 // Feed the cache size setting into the JDK
1924 char buffer[1024];
1925 sprintf(buffer, "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
1932
1933 if (AggressiveOpts) {
1934 // Sample flag setting code
1935 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1936 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1937 // }
1938 }
1939 }
1940
1941 //===========================================================================================================
1942 // Parsing of java.compiler property
1943
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 }
1952
1953 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1954 _sun_java_launcher = os::strdup_check_oom(launcher);
1955 }
1956
1957 bool Arguments::created_by_java_launcher() {
1958 assert(_sun_java_launcher != NULL, "property must have value");
1959 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1960 }
1961
1962 bool Arguments::sun_java_launcher_is_altjvm() {
1963 return _sun_java_launcher_is_altjvm;
1964 }
1965
1966 //===========================================================================================================
1967 // Parsing of main arguments
1968
1969 bool Arguments::verify_interval(uintx val, uintx min,
1970 uintx max, const char* name) {
1971 // Returns true iff value is in the inclusive interval [min..max]
1972 // false, otherwise.
1973 if (val >= min && val <= max) {
1974 return true;
1975 }
1976 jio_fprintf(defaultStream::error_stream(),
1977 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1978 " and " UINTX_FORMAT "\n",
1979 name, val, min, max);
1980 return false;
1981 }
1982
1983 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1984 // Returns true if given value is at least specified min threshold
1985 // false, otherwise.
1986 if (val >= min ) {
1987 return true;
1988 }
1989 jio_fprintf(defaultStream::error_stream(),
1990 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1991 name, val, min);
1992 return false;
1993 }
1994
1995 bool Arguments::verify_percentage(uintx value, const char* name) {
1996 if (is_percentage(value)) {
1997 return true;
1998 }
1999 jio_fprintf(defaultStream::error_stream(),
2000 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2001 name, value);
2002 return false;
2003 }
2004
2005 // check if do gclog rotation
2006 // +UseGCLogFileRotation is a must,
2007 // no gc log rotation when log file not supplied or
2008 // NumberOfGCLogFiles is 0
2009 void check_gclog_consistency() {
2010 if (UseGCLogFileRotation) {
2011 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2012 jio_fprintf(defaultStream::output_stream(),
2013 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2014 "where num_of_file > 0\n"
2015 "GC log rotation is turned off\n");
2016 UseGCLogFileRotation = false;
2017 }
2018 }
2019
2020 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2021 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2022 jio_fprintf(defaultStream::output_stream(),
2023 "GCLogFileSize changed to minimum 8K\n");
2024 }
2025 }
2026
2027 // This function is called for -Xloggc:<filename>, it can be used
2028 // to check if a given file name(or string) conforms to the following
2029 // specification:
2030 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2031 // %p and %t only allowed once. We only limit usage of filename not path
2032 bool is_filename_valid(const char *file_name) {
2033 const char* p = file_name;
2034 char file_sep = os::file_separator()[0];
2035 const char* cp;
2036 // skip prefix path
2037 for (cp = file_name; *cp != '\0'; cp++) {
2038 if (*cp == '/' || *cp == file_sep) {
2039 p = cp + 1;
2040 }
2041 }
2042
2043 int count_p = 0;
2044 int count_t = 0;
2045 while (*p != '\0') {
2046 if ((*p >= '0' && *p <= '9') ||
2047 (*p >= 'A' && *p <= 'Z') ||
2048 (*p >= 'a' && *p <= 'z') ||
2049 *p == '-' ||
2050 *p == '_' ||
2051 *p == '.') {
2052 p++;
2053 continue;
2054 }
2055 if (*p == '%') {
2056 if(*(p + 1) == 'p') {
2057 p += 2;
2058 count_p ++;
2059 continue;
2060 }
2061 if (*(p + 1) == 't') {
2062 p += 2;
2063 count_t ++;
2064 continue;
2065 }
2066 }
2067 return false;
2068 }
2069 return count_p < 2 && count_t < 2;
2070 }
2071
2072 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2073 if (!is_percentage(min_heap_free_ratio)) {
2074 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2075 return false;
2076 }
2077 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2078 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2079 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2080 MaxHeapFreeRatio);
2081 return false;
2082 }
2083 // This does not set the flag itself, but stores the value in a safe place for later usage.
2084 _min_heap_free_ratio = min_heap_free_ratio;
2085 return true;
2086 }
2087
2088 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2089 if (!is_percentage(max_heap_free_ratio)) {
2090 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2091 return false;
2092 }
2093 if (max_heap_free_ratio < MinHeapFreeRatio) {
2094 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2095 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2096 MinHeapFreeRatio);
2097 return false;
2098 }
2099 // This does not set the flag itself, but stores the value in a safe place for later usage.
2100 _max_heap_free_ratio = max_heap_free_ratio;
2101 return true;
2102 }
2103
2104 // Check consistency of GC selection
2105 bool Arguments::check_gc_consistency_user() {
2106 check_gclog_consistency();
2107 // Ensure that the user has not selected conflicting sets
2108 // of collectors.
2109 uint i = 0;
2110 if (UseSerialGC) i++;
2111 if (UseConcMarkSweepGC) i++;
2112 if (UseParallelGC || UseParallelOldGC) i++;
2113 if (UseG1GC) i++;
2114 if (i > 1) {
2115 jio_fprintf(defaultStream::error_stream(),
2116 "Conflicting collector combinations in option list; "
2117 "please refer to the release notes for the combinations "
2118 "allowed\n");
2119 return false;
2120 }
2121
2122 if (UseConcMarkSweepGC && !UseParNewGC) {
2123 jio_fprintf(defaultStream::error_stream(),
2124 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2125 return false;
2126 }
2127
2128 if (UseParNewGC && !UseConcMarkSweepGC) {
2129 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2130 // set up UseSerialGC properly, so that can't be used in the check here.
2131 jio_fprintf(defaultStream::error_stream(),
2132 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2133 return false;
2134 }
2135
2136 return true;
2137 }
2138
2139 void Arguments::check_deprecated_gc_flags() {
2140 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2141 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2142 }
2143 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2144 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2145 "and will likely be removed in future release");
2146 }
2147 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2148 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2149 "Use MaxRAMFraction instead.");
2150 }
2151 }
2152
2153 // Check stack pages settings
2154 bool Arguments::check_stack_pages()
2155 {
2156 bool status = true;
2157 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2158 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2159 // greater stack shadow pages can't generate instruction to bang stack
2160 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2161 return status;
2162 }
2163
2164 // Check the consistency of vm_init_args
2165 bool Arguments::check_vm_args_consistency() {
2166 // Method for adding checks for flag consistency.
2167 // The intent is to warn the user of all possible conflicts,
2168 // before returning an error.
2169 // Note: Needs platform-dependent factoring.
2170 bool status = true;
2171
2172 if (TLABRefillWasteFraction == 0) {
2173 jio_fprintf(defaultStream::error_stream(),
2174 "TLABRefillWasteFraction should be a denominator, "
2175 "not " SIZE_FORMAT "\n",
2176 TLABRefillWasteFraction);
2177 status = false;
2178 }
2179
2180 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2181 "AdaptiveSizePolicyWeight");
2182 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2183
2184 // Divide by bucket size to prevent a large size from causing rollover when
2185 // calculating amount of memory needed to be allocated for the String table.
2186 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2187 (max_uintx / StringTable::bucket_size()), "StringTable size");
2188
2189 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2190 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2191
2192 {
2193 // Using "else if" below to avoid printing two error messages if min > max.
2194 // This will also prevent us from reporting both min>100 and max>100 at the
2195 // same time, but that is less annoying than printing two identical errors IMHO.
2196 FormatBuffer<80> err_msg("%s","");
2197 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2198 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2199 status = false;
2200 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2201 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2202 status = false;
2203 }
2204 }
2205
2206 // Min/MaxMetaspaceFreeRatio
2207 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2208 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2209
2210 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2211 jio_fprintf(defaultStream::error_stream(),
2212 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2213 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2214 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2215 MinMetaspaceFreeRatio,
2216 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2217 MaxMetaspaceFreeRatio);
2218 status = false;
2219 }
2220
2221 // Trying to keep 100% free is not practical
2222 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2223
2224 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2225 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2226 }
2227
2228 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2229 // Settings to encourage splitting.
2230 if (!FLAG_IS_CMDLINE(NewRatio)) {
2231 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2232 }
2233 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2234 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2235 }
2236 }
2237
2238 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2239 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2240 }
2241
2242 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2243 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2244 if (GCTimeLimit == 100) {
2245 // Turn off gc-overhead-limit-exceeded checks
2246 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2247 }
2248
2249 status = status && check_gc_consistency_user();
2250 status = status && check_stack_pages();
2251
2252 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2253 "CMSIncrementalSafetyFactor");
2254
2255 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2256 // insists that we hold the requisite locks so that the iteration is
2257 // MT-safe. For the verification at start-up and shut-down, we don't
2258 // yet have a good way of acquiring and releasing these locks,
2259 // which are not visible at the CollectedHeap level. We want to
2260 // be able to acquire these locks and then do the iteration rather
2261 // than just disable the lock verification. This will be fixed under
2262 // bug 4788986.
2263 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2264 if (VerifyDuringStartup) {
2265 warning("Heap verification at start-up disabled "
2266 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2267 VerifyDuringStartup = false; // Disable verification at start-up
2268 }
2269
2270 if (VerifyBeforeExit) {
2271 warning("Heap verification at shutdown disabled "
2272 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2273 VerifyBeforeExit = false; // Disable verification at shutdown
2274 }
2275 }
2276
2277 // Note: only executed in non-PRODUCT mode
2278 if (!UseAsyncConcMarkSweepGC &&
2279 (ExplicitGCInvokesConcurrent ||
2280 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2281 jio_fprintf(defaultStream::error_stream(),
2282 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2283 " with -UseAsyncConcMarkSweepGC");
2284 status = false;
2285 }
2286
2287 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2288
2289 #if INCLUDE_ALL_GCS
2290 if (UseG1GC) {
2291 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2292 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2293 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2294
2295 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2296 "InitiatingHeapOccupancyPercent");
2297 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2298 "G1RefProcDrainInterval");
2299 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2300 "G1ConcMarkStepDurationMillis");
2301 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2302 "G1ConcRSHotCardLimit");
2303 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2304 "G1ConcRSLogCacheSize");
2305 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2306 "StringDeduplicationAgeThreshold");
2307 }
2308 if (UseConcMarkSweepGC) {
2309 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2310 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2311 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2312 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2313
2314 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2315
2316 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2317 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2318 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2319
2320 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2321
2322 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2323 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2324
2325 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2326 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2327 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2328
2329 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2330
2331 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2332
2333 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2334 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2335 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2336 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2337 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2338 }
2339
2340 if (UseParallelGC || UseParallelOldGC) {
2341 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2342 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2343
2344 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2345 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2346
2347 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2348 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2349
2350 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2351
2352 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2353 }
2354 #endif // INCLUDE_ALL_GCS
2355
2356 status = status && verify_interval(RefDiscoveryPolicy,
2357 ReferenceProcessor::DiscoveryPolicyMin,
2358 ReferenceProcessor::DiscoveryPolicyMax,
2359 "RefDiscoveryPolicy");
2360
2361 // Limit the lower bound of this flag to 1 as it is used in a division
2362 // expression.
2363 status = status && verify_interval(TLABWasteTargetPercent,
2364 1, 100, "TLABWasteTargetPercent");
2365
2366 status = status && verify_object_alignment();
2367
2368 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2369 "CompressedClassSpaceSize");
2370
2371 status = status && verify_interval(MarkStackSizeMax,
2372 1, (max_jint - 1), "MarkStackSizeMax");
2373 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2374
2375 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2376
2377 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2378
2379 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2380
2381 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2382 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2383
2384 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2385
2386 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2387 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2388 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2389 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2390
2391 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2392 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2393
2394 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2395 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2396 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2397
2398 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2399 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2400
2401 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2402 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2403 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2404 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2405
2406 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2407 #ifdef COMPILER1
2408 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2409 #endif
2410
2411 if (PrintNMTStatistics) {
2412 #if INCLUDE_NMT
2413 if (MemTracker::tracking_level() == NMT_off) {
2414 #endif // INCLUDE_NMT
2415 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2416 PrintNMTStatistics = false;
2417 #if INCLUDE_NMT
2418 }
2419 #endif
2420 }
2421
2422 // Need to limit the extent of the padding to reasonable size.
2423 // 8K is well beyond the reasonable HW cache line size, even with the
2424 // aggressive prefetching, while still leaving the room for segregating
2425 // among the distinct pages.
2426 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2427 jio_fprintf(defaultStream::error_stream(),
2428 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2429 ContendedPaddingWidth, 0, 8192);
2430 status = false;
2431 }
2432
2433 // Need to enforce the padding not to break the existing field alignments.
2434 // It is sufficient to check against the largest type size.
2435 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2438 ContendedPaddingWidth, BytesPerLong);
2439 status = false;
2440 }
2441
2442 // Check lower bounds of the code cache
2443 // Template Interpreter code is approximately 3X larger in debug builds.
2444 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2445 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2446 jio_fprintf(defaultStream::error_stream(),
2447 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2448 os::vm_page_size()/K);
2449 status = false;
2450 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2451 jio_fprintf(defaultStream::error_stream(),
2452 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2453 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2454 status = false;
2455 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2456 jio_fprintf(defaultStream::error_stream(),
2457 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2458 min_code_cache_size/K);
2459 status = false;
2460 } else if (ReservedCodeCacheSize > 2*G) {
2461 // Code cache size larger than MAXINT is not supported.
2462 jio_fprintf(defaultStream::error_stream(),
2463 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2464 (2*G)/M);
2465 status = false;
2466 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2467 jio_fprintf(defaultStream::error_stream(),
2468 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2469 min_code_cache_size/K);
2470 status = false;
2471 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2472 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2475 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2476 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2477 status = false;
2478 }
2479
2480 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2481 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2482 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2483 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2484
2485
2486 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2487 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2488 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2489 // Check the minimum number of compiler threads
2490 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2491
2492 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2493 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2494 }
2495
2496 return status;
2497 }
2498
2499 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2500 const char* option_type) {
2501 if (ignore) return false;
2502
2503 const char* spacer = " ";
2504 if (option_type == NULL) {
2505 option_type = ++spacer; // Set both to the empty string.
2506 }
2507
2508 if (os::obsolete_option(option)) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Obsolete %s%soption: %s\n", option_type, spacer,
2511 option->optionString);
2512 return false;
2513 } else {
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Unrecognized %s%soption: %s\n", option_type, spacer,
2516 option->optionString);
2517 return true;
2518 }
2519 }
2520
2521 static const char* user_assertion_options[] = {
2522 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2523 };
2524
2525 static const char* system_assertion_options[] = {
2526 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2527 };
2528
2529 // Return true if any of the strings in null-terminated array 'names' matches.
2530 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2531 // the option must match exactly.
2532 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2533 bool tail_allowed) {
2534 for (/* empty */; *names != NULL; ++names) {
2535 if (match_option(option, *names, tail)) {
2536 if (**tail == '\0' || tail_allowed && **tail == ':') {
2537 return true;
2538 }
2539 }
2540 }
2541 return false;
2542 }
2543
2544 bool Arguments::parse_uintx(const char* value,
2545 uintx* uintx_arg,
2546 uintx min_size) {
2547
2548 // Check the sign first since atomull() parses only unsigned values.
2549 bool value_is_positive = !(*value == '-');
2550
2551 if (value_is_positive) {
2552 julong n;
2553 bool good_return = atomull(value, &n);
2554 if (good_return) {
2555 bool above_minimum = n >= min_size;
2556 bool value_is_too_large = n > max_uintx;
2557
2558 if (above_minimum && !value_is_too_large) {
2559 *uintx_arg = n;
2560 return true;
2561 }
2562 }
2563 }
2564 return false;
2565 }
2566
2567 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2568 julong* long_arg,
2569 julong min_size) {
2570 if (!atomull(s, long_arg)) return arg_unreadable;
2571 return check_memory_size(*long_arg, min_size);
2572 }
2573
2574 // Parse JavaVMInitArgs structure
2575
2576 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2577 // For components of the system classpath.
2578 SysClassPath scp(Arguments::get_sysclasspath());
2579 bool scp_assembly_required = false;
2580
2581 // Save default settings for some mode flags
2582 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2583 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2584 Arguments::_ClipInlining = ClipInlining;
2585 Arguments::_BackgroundCompilation = BackgroundCompilation;
2586
2587 // Setup flags for mixed which is the default
2588 set_mode_flags(_mixed);
2589
2590 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2591 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2592 if (result != JNI_OK) {
2593 return result;
2594 }
2595
2596 // Parse JavaVMInitArgs structure passed in
2597 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2598 if (result != JNI_OK) {
2599 return result;
2600 }
2601
2602 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2603 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2604 if (result != JNI_OK) {
2605 return result;
2606 }
2607
2608 // Do final processing now that all arguments have been parsed
2609 result = finalize_vm_init_args(&scp, scp_assembly_required);
2610 if (result != JNI_OK) {
2611 return result;
2612 }
2613
2614 return JNI_OK;
2615 }
2616
2617 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2618 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2619 // are dealing with -agentpath (case where name is a path), otherwise with
2620 // -agentlib
2621 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2622 char *_name;
2623 const char *_hprof = "hprof", *_jdwp = "jdwp";
2624 size_t _len_hprof, _len_jdwp, _len_prefix;
2625
2626 if (is_path) {
2627 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2628 return false;
2629 }
2630
2631 _name++; // skip past last path separator
2632 _len_prefix = strlen(JNI_LIB_PREFIX);
2633
2634 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2635 return false;
2636 }
2637
2638 _name += _len_prefix;
2639 _len_hprof = strlen(_hprof);
2640 _len_jdwp = strlen(_jdwp);
2641
2642 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2643 _name += _len_hprof;
2644 }
2645 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2646 _name += _len_jdwp;
2647 }
2648 else {
2649 return false;
2650 }
2651
2652 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2653 return false;
2654 }
2655
2656 return true;
2657 }
2658
2659 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2660 return true;
2661 }
2662
2663 return false;
2664 }
2665
2666 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2667 SysClassPath* scp_p,
2668 bool* scp_assembly_required_p,
2669 Flag::Flags origin) {
2670 // Remaining part of option string
2671 const char* tail;
2672
2673 // iterate over arguments
2674 for (int index = 0; index < args->nOptions; index++) {
2675 bool is_absolute_path = false; // for -agentpath vs -agentlib
2676
2677 const JavaVMOption* option = args->options + index;
2678
2679 if (!match_option(option, "-Djava.class.path", &tail) &&
2680 !match_option(option, "-Dsun.java.command", &tail) &&
2681 !match_option(option, "-Dsun.java.launcher", &tail)) {
2682
2683 // add all jvm options to the jvm_args string. This string
2684 // is used later to set the java.vm.args PerfData string constant.
2685 // the -Djava.class.path and the -Dsun.java.command options are
2686 // omitted from jvm_args string as each have their own PerfData
2687 // string constant object.
2688 build_jvm_args(option->optionString);
2689 }
2690
2691 // -verbose:[class/gc/jni]
2692 if (match_option(option, "-verbose", &tail)) {
2693 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2694 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2695 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2696 } else if (!strcmp(tail, ":gc")) {
2697 FLAG_SET_CMDLINE(bool, PrintGC, true);
2698 } else if (!strcmp(tail, ":jni")) {
2699 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2700 }
2701 // -da / -ea / -disableassertions / -enableassertions
2702 // These accept an optional class/package name separated by a colon, e.g.,
2703 // -da:java.lang.Thread.
2704 } else if (match_option(option, user_assertion_options, &tail, true)) {
2705 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2706 if (*tail == '\0') {
2707 JavaAssertions::setUserClassDefault(enable);
2708 } else {
2709 assert(*tail == ':', "bogus match by match_option()");
2710 JavaAssertions::addOption(tail + 1, enable);
2711 }
2712 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2713 } else if (match_option(option, system_assertion_options, &tail, false)) {
2714 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2715 JavaAssertions::setSystemClassDefault(enable);
2716 // -bootclasspath:
2717 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2718 scp_p->reset_path(tail);
2719 *scp_assembly_required_p = true;
2720 // -bootclasspath/a:
2721 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2722 scp_p->add_suffix(tail);
2723 *scp_assembly_required_p = true;
2724 // -bootclasspath/p:
2725 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2726 scp_p->add_prefix(tail);
2727 *scp_assembly_required_p = true;
2728 // -Xrun
2729 } else if (match_option(option, "-Xrun", &tail)) {
2730 if (tail != NULL) {
2731 const char* pos = strchr(tail, ':');
2732 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2733 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2734 name[len] = '\0';
2735
2736 char *options = NULL;
2737 if(pos != NULL) {
2738 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2739 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2740 }
2741 #if !INCLUDE_JVMTI
2742 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Profiling and debugging agents are not supported in this VM\n");
2745 return JNI_ERR;
2746 }
2747 #endif // !INCLUDE_JVMTI
2748 add_init_library(name, options);
2749 }
2750 // -agentlib and -agentpath
2751 } else if (match_option(option, "-agentlib:", &tail) ||
2752 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2753 if(tail != NULL) {
2754 const char* pos = strchr(tail, '=');
2755 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2756 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2757 name[len] = '\0';
2758
2759 char *options = NULL;
2760 if(pos != NULL) {
2761 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2762 }
2763 #if !INCLUDE_JVMTI
2764 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2765 jio_fprintf(defaultStream::error_stream(),
2766 "Profiling and debugging agents are not supported in this VM\n");
2767 return JNI_ERR;
2768 }
2769 #endif // !INCLUDE_JVMTI
2770 add_init_agent(name, options, is_absolute_path);
2771 }
2772 // -javaagent
2773 } else if (match_option(option, "-javaagent:", &tail)) {
2774 #if !INCLUDE_JVMTI
2775 jio_fprintf(defaultStream::error_stream(),
2776 "Instrumentation agents are not supported in this VM\n");
2777 return JNI_ERR;
2778 #else
2779 if(tail != NULL) {
2780 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2781 add_init_agent("instrument", options, false);
2782 }
2783 #endif // !INCLUDE_JVMTI
2784 // -Xnoclassgc
2785 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2786 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2787 // -Xconcgc
2788 } else if (match_option(option, "-Xconcgc", &tail)) {
2789 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2790 // -Xnoconcgc
2791 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2792 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2793 // -Xbatch
2794 } else if (match_option(option, "-Xbatch", &tail)) {
2795 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2796 // -Xmn for compatibility with other JVM vendors
2797 } else if (match_option(option, "-Xmn", &tail)) {
2798 julong long_initial_young_size = 0;
2799 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2800 if (errcode != arg_in_range) {
2801 jio_fprintf(defaultStream::error_stream(),
2802 "Invalid initial young generation size: %s\n", option->optionString);
2803 describe_range_error(errcode);
2804 return JNI_EINVAL;
2805 }
2806 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2807 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2808 // -Xms
2809 } else if (match_option(option, "-Xms", &tail)) {
2810 julong long_initial_heap_size = 0;
2811 // an initial heap size of 0 means automatically determine
2812 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2813 if (errcode != arg_in_range) {
2814 jio_fprintf(defaultStream::error_stream(),
2815 "Invalid initial heap size: %s\n", option->optionString);
2816 describe_range_error(errcode);
2817 return JNI_EINVAL;
2818 }
2819 set_min_heap_size((uintx)long_initial_heap_size);
2820 // Currently the minimum size and the initial heap sizes are the same.
2821 // Can be overridden with -XX:InitialHeapSize.
2822 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2823 // -Xmx
2824 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2825 julong long_max_heap_size = 0;
2826 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2827 if (errcode != arg_in_range) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Invalid maximum heap size: %s\n", option->optionString);
2830 describe_range_error(errcode);
2831 return JNI_EINVAL;
2832 }
2833 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2834 // Xmaxf
2835 } else if (match_option(option, "-Xmaxf", &tail)) {
2836 char* err;
2837 int maxf = (int)(strtod(tail, &err) * 100);
2838 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2839 jio_fprintf(defaultStream::error_stream(),
2840 "Bad max heap free percentage size: %s\n",
2841 option->optionString);
2842 return JNI_EINVAL;
2843 } else {
2844 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2845 }
2846 // Xminf
2847 } else if (match_option(option, "-Xminf", &tail)) {
2848 char* err;
2849 int minf = (int)(strtod(tail, &err) * 100);
2850 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Bad min heap free percentage size: %s\n",
2853 option->optionString);
2854 return JNI_EINVAL;
2855 } else {
2856 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2857 }
2858 // -Xss
2859 } else if (match_option(option, "-Xss", &tail)) {
2860 julong long_ThreadStackSize = 0;
2861 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2862 if (errcode != arg_in_range) {
2863 jio_fprintf(defaultStream::error_stream(),
2864 "Invalid thread stack size: %s\n", option->optionString);
2865 describe_range_error(errcode);
2866 return JNI_EINVAL;
2867 }
2868 // Internally track ThreadStackSize in units of 1024 bytes.
2869 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2870 round_to((int)long_ThreadStackSize, K) / K);
2871 // -Xoss
2872 } else if (match_option(option, "-Xoss", &tail)) {
2873 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2874 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2875 julong long_CodeCacheExpansionSize = 0;
2876 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2877 if (errcode != arg_in_range) {
2878 jio_fprintf(defaultStream::error_stream(),
2879 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2880 os::vm_page_size()/K);
2881 return JNI_EINVAL;
2882 }
2883 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2884 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2885 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2886 julong long_ReservedCodeCacheSize = 0;
2887
2888 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2889 if (errcode != arg_in_range) {
2890 jio_fprintf(defaultStream::error_stream(),
2891 "Invalid maximum code cache size: %s.\n", option->optionString);
2892 return JNI_EINVAL;
2893 }
2894 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2895 // -XX:NonNMethodCodeHeapSize=
2896 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2897 julong long_NonNMethodCodeHeapSize = 0;
2898
2899 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2900 if (errcode != arg_in_range) {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2903 return JNI_EINVAL;
2904 }
2905 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2906 // -XX:ProfiledCodeHeapSize=
2907 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2908 julong long_ProfiledCodeHeapSize = 0;
2909
2910 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2911 if (errcode != arg_in_range) {
2912 jio_fprintf(defaultStream::error_stream(),
2913 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2914 return JNI_EINVAL;
2915 }
2916 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2917 // -XX:NonProfiledCodeHeapSizee=
2918 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2919 julong long_NonProfiledCodeHeapSize = 0;
2920
2921 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2922 if (errcode != arg_in_range) {
2923 jio_fprintf(defaultStream::error_stream(),
2924 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2925 return JNI_EINVAL;
2926 }
2927 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2928 //-XX:IncreaseFirstTierCompileThresholdAt=
2929 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2930 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2931 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2932 jio_fprintf(defaultStream::error_stream(),
2933 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2934 option->optionString);
2935 return JNI_EINVAL;
2936 }
2937 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2938 // -green
2939 } else if (match_option(option, "-green", &tail)) {
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Green threads support not available\n");
2942 return JNI_EINVAL;
2943 // -native
2944 } else if (match_option(option, "-native", &tail)) {
2945 // HotSpot always uses native threads, ignore silently for compatibility
2946 // -Xsqnopause
2947 } else if (match_option(option, "-Xsqnopause", &tail)) {
2948 // EVM option, ignore silently for compatibility
2949 // -Xrs
2950 } else if (match_option(option, "-Xrs", &tail)) {
2951 // Classic/EVM option, new functionality
2952 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2953 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2954 // change default internal VM signals used - lower case for back compat
2955 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2956 // -Xoptimize
2957 } else if (match_option(option, "-Xoptimize", &tail)) {
2958 // EVM option, ignore silently for compatibility
2959 // -Xprof
2960 } else if (match_option(option, "-Xprof", &tail)) {
2961 #if INCLUDE_FPROF
2962 _has_profile = true;
2963 #else // INCLUDE_FPROF
2964 jio_fprintf(defaultStream::error_stream(),
2965 "Flat profiling is not supported in this VM.\n");
2966 return JNI_ERR;
2967 #endif // INCLUDE_FPROF
2968 // -Xconcurrentio
2969 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2970 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2971 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2972 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2973 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2974 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2975
2976 // -Xinternalversion
2977 } else if (match_option(option, "-Xinternalversion", &tail)) {
2978 jio_fprintf(defaultStream::output_stream(), "%s\n",
2979 VM_Version::internal_vm_info_string());
2980 vm_exit(0);
2981 #ifndef PRODUCT
2982 // -Xprintflags
2983 } else if (match_option(option, "-Xprintflags", &tail)) {
2984 CommandLineFlags::printFlags(tty, false);
2985 vm_exit(0);
2986 #endif
2987 // -D
2988 } else if (match_option(option, "-D", &tail)) {
2989 const char* value;
2990 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2991 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2992 // abort if -Djava.endorsed.dirs is set
2993 jio_fprintf(defaultStream::output_stream(),
2994 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2995 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2996 return JNI_EINVAL;
2997 }
2998 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2999 *value != '\0' && strcmp(value, "\"\"") != 0) {
3000 // abort if -Djava.ext.dirs is set
3001 jio_fprintf(defaultStream::output_stream(),
3002 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3003 return JNI_EINVAL;
3004 }
3005
3006 if (!add_property(tail)) {
3007 return JNI_ENOMEM;
3008 }
3009 // Out of the box management support
3010 if (match_option(option, "-Dcom.sun.management", &tail)) {
3011 #if INCLUDE_MANAGEMENT
3012 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3013 #else
3014 jio_fprintf(defaultStream::output_stream(),
3015 "-Dcom.sun.management is not supported in this VM.\n");
3016 return JNI_ERR;
3017 #endif
3018 }
3019 // -Xint
3020 } else if (match_option(option, "-Xint", &tail)) {
3021 set_mode_flags(_int);
3022 // -Xmixed
3023 } else if (match_option(option, "-Xmixed", &tail)) {
3024 set_mode_flags(_mixed);
3025 // -Xcomp
3026 } else if (match_option(option, "-Xcomp", &tail)) {
3027 // for testing the compiler; turn off all flags that inhibit compilation
3028 set_mode_flags(_comp);
3029 // -Xshare:dump
3030 } else if (match_option(option, "-Xshare:dump", &tail)) {
3031 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3032 set_mode_flags(_int); // Prevent compilation, which creates objects
3033 // -Xshare:on
3034 } else if (match_option(option, "-Xshare:on", &tail)) {
3035 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3036 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3037 // -Xshare:auto
3038 } else if (match_option(option, "-Xshare:auto", &tail)) {
3039 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3040 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3041 // -Xshare:off
3042 } else if (match_option(option, "-Xshare:off", &tail)) {
3043 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3044 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3045 // -Xverify
3046 } else if (match_option(option, "-Xverify", &tail)) {
3047 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3048 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3049 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3050 } else if (strcmp(tail, ":remote") == 0) {
3051 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3052 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3053 } else if (strcmp(tail, ":none") == 0) {
3054 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3055 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3056 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3057 return JNI_EINVAL;
3058 }
3059 // -Xdebug
3060 } else if (match_option(option, "-Xdebug", &tail)) {
3061 // note this flag has been used, then ignore
3062 set_xdebug_mode(true);
3063 // -Xnoagent
3064 } else if (match_option(option, "-Xnoagent", &tail)) {
3065 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3066 } else if (match_option(option, "-Xboundthreads", &tail)) {
3067 // Bind user level threads to kernel threads (Solaris only)
3068 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3069 } else if (match_option(option, "-Xloggc:", &tail)) {
3070 // Redirect GC output to the file. -Xloggc:<filename>
3071 // ostream_init_log(), when called will use this filename
3072 // to initialize a fileStream.
3073 _gc_log_filename = os::strdup_check_oom(tail);
3074 if (!is_filename_valid(_gc_log_filename)) {
3075 jio_fprintf(defaultStream::output_stream(),
3076 "Invalid file name for use with -Xloggc: Filename can only contain the "
3077 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3078 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3079 return JNI_EINVAL;
3080 }
3081 FLAG_SET_CMDLINE(bool, PrintGC, true);
3082 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3083
3084 // JNI hooks
3085 } else if (match_option(option, "-Xcheck", &tail)) {
3086 if (!strcmp(tail, ":jni")) {
3087 #if !INCLUDE_JNI_CHECK
3088 warning("JNI CHECKING is not supported in this VM");
3089 #else
3090 CheckJNICalls = true;
3091 #endif // INCLUDE_JNI_CHECK
3092 } else if (is_bad_option(option, args->ignoreUnrecognized,
3093 "check")) {
3094 return JNI_EINVAL;
3095 }
3096 } else if (match_option(option, "vfprintf", &tail)) {
3097 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3098 } else if (match_option(option, "exit", &tail)) {
3099 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3100 } else if (match_option(option, "abort", &tail)) {
3101 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3102 // -XX:+AggressiveHeap
3103 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3104
3105 // This option inspects the machine and attempts to set various
3106 // parameters to be optimal for long-running, memory allocation
3107 // intensive jobs. It is intended for machines with large
3108 // amounts of cpu and memory.
3109
3110 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3111 // VM, but we may not be able to represent the total physical memory
3112 // available (like having 8gb of memory on a box but using a 32bit VM).
3113 // Thus, we need to make sure we're using a julong for intermediate
3114 // calculations.
3115 julong initHeapSize;
3116 julong total_memory = os::physical_memory();
3117
3118 if (total_memory < (julong)256*M) {
3119 jio_fprintf(defaultStream::error_stream(),
3120 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3121 vm_exit(1);
3122 }
3123
3124 // The heap size is half of available memory, or (at most)
3125 // all of possible memory less 160mb (leaving room for the OS
3126 // when using ISM). This is the maximum; because adaptive sizing
3127 // is turned on below, the actual space used may be smaller.
3128
3129 initHeapSize = MIN2(total_memory / (julong)2,
3130 total_memory - (julong)160*M);
3131
3132 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3133
3134 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3135 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3136 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3137 // Currently the minimum size and the initial heap sizes are the same.
3138 set_min_heap_size(initHeapSize);
3139 }
3140 if (FLAG_IS_DEFAULT(NewSize)) {
3141 // Make the young generation 3/8ths of the total heap.
3142 FLAG_SET_CMDLINE(uintx, NewSize,
3143 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3144 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3145 }
3146
3147 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3148 FLAG_SET_DEFAULT(UseLargePages, true);
3149 #endif
3150
3151 // Increase some data structure sizes for efficiency
3152 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3153 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3154 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3155
3156 // See the OldPLABSize comment below, but replace 'after promotion'
3157 // with 'after copying'. YoungPLABSize is the size of the survivor
3158 // space per-gc-thread buffers. The default is 4kw.
3159 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3160
3161 // OldPLABSize is the size of the buffers in the old gen that
3162 // UseParallelGC uses to promote live data that doesn't fit in the
3163 // survivor spaces. At any given time, there's one for each gc thread.
3164 // The default size is 1kw. These buffers are rarely used, since the
3165 // survivor spaces are usually big enough. For specjbb, however, there
3166 // are occasions when there's lots of live data in the young gen
3167 // and we end up promoting some of it. We don't have a definite
3168 // explanation for why bumping OldPLABSize helps, but the theory
3169 // is that a bigger PLAB results in retaining something like the
3170 // original allocation order after promotion, which improves mutator
3171 // locality. A minor effect may be that larger PLABs reduce the
3172 // number of PLAB allocation events during gc. The value of 8kw
3173 // was arrived at by experimenting with specjbb.
3174 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3175
3176 // Enable parallel GC and adaptive generation sizing
3177 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3178 FLAG_SET_DEFAULT(ParallelGCThreads,
3179 Abstract_VM_Version::parallel_worker_threads());
3180
3181 // Encourage steady state memory management
3182 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3183
3184 // This appears to improve mutator locality
3185 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3186
3187 // Get around early Solaris scheduling bug
3188 // (affinity vs other jobs on system)
3189 // but disallow DR and offlining (5008695).
3190 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3191
3192 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3193 // and the last option wins.
3194 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3195 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3196 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3197 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3198 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3199 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3200 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3201 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3202 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3203 uintx max_tenuring_thresh = 0;
3204 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3205 jio_fprintf(defaultStream::error_stream(),
3206 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3207 }
3208 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3209
3210 if (MaxTenuringThreshold == 0) {
3211 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3212 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3213 } else {
3214 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3215 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3216 }
3217 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3218 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3219 jio_fprintf(defaultStream::error_stream(),
3220 "Please use CMSClassUnloadingEnabled in place of "
3221 "CMSPermGenSweepingEnabled in the future\n");
3222 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3223 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3224 jio_fprintf(defaultStream::error_stream(),
3225 "Please use -XX:+UseGCOverheadLimit in place of "
3226 "-XX:+UseGCTimeLimit in the future\n");
3227 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3228 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3229 jio_fprintf(defaultStream::error_stream(),
3230 "Please use -XX:-UseGCOverheadLimit in place of "
3231 "-XX:-UseGCTimeLimit in the future\n");
3232 // The TLE options are for compatibility with 1.3 and will be
3233 // removed without notice in a future release. These options
3234 // are not to be documented.
3235 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3236 // No longer used.
3237 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3238 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3239 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3240 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3241 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3242 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3243 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3244 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3245 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3246 // No longer used.
3247 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3248 julong long_tlab_size = 0;
3249 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3250 if (errcode != arg_in_range) {
3251 jio_fprintf(defaultStream::error_stream(),
3252 "Invalid TLAB size: %s\n", option->optionString);
3253 describe_range_error(errcode);
3254 return JNI_EINVAL;
3255 }
3256 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3257 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3258 // No longer used.
3259 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3260 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3261 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3262 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3263 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3264 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3265 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3266 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3267 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3268 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3269 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3270 #if defined(DTRACE_ENABLED)
3271 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3272 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3273 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3274 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3275 #else // defined(DTRACE_ENABLED)
3276 jio_fprintf(defaultStream::error_stream(),
3277 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3278 return JNI_EINVAL;
3279 #endif // defined(DTRACE_ENABLED)
3280 #ifdef ASSERT
3281 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3282 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3283 // disable scavenge before parallel mark-compact
3284 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3285 #endif
3286 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3287 julong cms_blocks_to_claim = (julong)atol(tail);
3288 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3289 jio_fprintf(defaultStream::error_stream(),
3290 "Please use -XX:OldPLABSize in place of "
3291 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3292 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3293 julong cms_blocks_to_claim = (julong)atol(tail);
3294 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3295 jio_fprintf(defaultStream::error_stream(),
3296 "Please use -XX:OldPLABSize in place of "
3297 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3298 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3299 julong old_plab_size = 0;
3300 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3301 if (errcode != arg_in_range) {
3302 jio_fprintf(defaultStream::error_stream(),
3303 "Invalid old PLAB size: %s\n", option->optionString);
3304 describe_range_error(errcode);
3305 return JNI_EINVAL;
3306 }
3307 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3308 jio_fprintf(defaultStream::error_stream(),
3309 "Please use -XX:OldPLABSize in place of "
3310 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3311 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3312 julong young_plab_size = 0;
3313 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3314 if (errcode != arg_in_range) {
3315 jio_fprintf(defaultStream::error_stream(),
3316 "Invalid young PLAB size: %s\n", option->optionString);
3317 describe_range_error(errcode);
3318 return JNI_EINVAL;
3319 }
3320 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3321 jio_fprintf(defaultStream::error_stream(),
3322 "Please use -XX:YoungPLABSize in place of "
3323 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3324 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3325 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3326 julong stack_size = 0;
3327 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3328 if (errcode != arg_in_range) {
3329 jio_fprintf(defaultStream::error_stream(),
3330 "Invalid mark stack size: %s\n", option->optionString);
3331 describe_range_error(errcode);
3332 return JNI_EINVAL;
3333 }
3334 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3335 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3336 julong max_stack_size = 0;
3337 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3338 if (errcode != arg_in_range) {
3339 jio_fprintf(defaultStream::error_stream(),
3340 "Invalid maximum mark stack size: %s\n",
3341 option->optionString);
3342 describe_range_error(errcode);
3343 return JNI_EINVAL;
3344 }
3345 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3346 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3347 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3348 uintx conc_threads = 0;
3349 if (!parse_uintx(tail, &conc_threads, 1)) {
3350 jio_fprintf(defaultStream::error_stream(),
3351 "Invalid concurrent threads: %s\n", option->optionString);
3352 return JNI_EINVAL;
3353 }
3354 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3355 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3356 julong max_direct_memory_size = 0;
3357 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3358 if (errcode != arg_in_range) {
3359 jio_fprintf(defaultStream::error_stream(),
3360 "Invalid maximum direct memory size: %s\n",
3361 option->optionString);
3362 describe_range_error(errcode);
3363 return JNI_EINVAL;
3364 }
3365 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3366 #if !INCLUDE_MANAGEMENT
3367 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3368 jio_fprintf(defaultStream::error_stream(),
3369 "ManagementServer is not supported in this VM.\n");
3370 return JNI_ERR;
3371 #endif // INCLUDE_MANAGEMENT
3372 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3373 // Skip -XX:Flags= since that case has already been handled
3374 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3375 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3376 return JNI_EINVAL;
3377 }
3378 }
3379 // Unknown option
3380 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3381 return JNI_ERR;
3382 }
3383 }
3384
3385 // PrintSharedArchiveAndExit will turn on
3386 // -Xshare:on
3387 // -XX:+TraceClassPaths
3388 if (PrintSharedArchiveAndExit) {
3389 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3390 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3391 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3392 }
3393
3394 // Change the default value for flags which have different default values
3395 // when working with older JDKs.
3396 #ifdef LINUX
3397 if (JDK_Version::current().compare_major(6) <= 0 &&
3398 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3399 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3400 }
3401 #endif // LINUX
3402 fix_appclasspath();
3403 return JNI_OK;
3404 }
3405
3406 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3407 //
3408 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3409 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3410 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3411 // path is treated as the current directory.
3412 //
3413 // This causes problems with CDS, which requires that all directories specified in the classpath
3414 // must be empty. In most cases, applications do NOT want to load classes from the current
3415 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3416 // scripts compatible with CDS.
3417 void Arguments::fix_appclasspath() {
3418 if (IgnoreEmptyClassPaths) {
3419 const char separator = *os::path_separator();
3420 const char* src = _java_class_path->value();
3421
3422 // skip over all the leading empty paths
3423 while (*src == separator) {
3424 src ++;
3425 }
3426
3427 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3428 strncpy(copy, src, strlen(src) + 1);
3429
3430 // trim all trailing empty paths
3431 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3432 *tail = '\0';
3433 }
3434
3435 char from[3] = {separator, separator, '\0'};
3436 char to [2] = {separator, '\0'};
3437 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3438 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3439 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3440 }
3441
3442 _java_class_path->set_value(copy);
3443 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3444 }
3445
3446 if (!PrintSharedArchiveAndExit) {
3447 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3448 }
3449 }
3450
3451 static bool has_jar_files(const char* directory) {
3452 DIR* dir = os::opendir(directory);
3453 if (dir == NULL) return false;
3454
3455 struct dirent *entry;
3456 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3457 bool hasJarFile = false;
3458 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3459 const char* name = entry->d_name;
3460 const char* ext = name + strlen(name) - 4;
3461 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3462 }
3463 FREE_C_HEAP_ARRAY(char, dbuf);
3464 os::closedir(dir);
3465 return hasJarFile ;
3466 }
3467
3468 static int check_non_empty_dirs(const char* path) {
3469 const char separator = *os::path_separator();
3470 const char* const end = path + strlen(path);
3471 int nonEmptyDirs = 0;
3472 while (path < end) {
3473 const char* tmp_end = strchr(path, separator);
3474 if (tmp_end == NULL) {
3475 if (has_jar_files(path)) {
3476 nonEmptyDirs++;
3477 jio_fprintf(defaultStream::output_stream(),
3478 "Non-empty directory: %s\n", path);
3479 }
3480 path = end;
3481 } else {
3482 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3483 memcpy(dirpath, path, tmp_end - path);
3484 dirpath[tmp_end - path] = '\0';
3485 if (has_jar_files(dirpath)) {
3486 nonEmptyDirs++;
3487 jio_fprintf(defaultStream::output_stream(),
3488 "Non-empty directory: %s\n", dirpath);
3489 }
3490 FREE_C_HEAP_ARRAY(char, dirpath);
3491 path = tmp_end + 1;
3492 }
3493 }
3494 return nonEmptyDirs;
3495 }
3496
3497 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3498 // check if the default lib/endorsed directory exists; if so, error
3499 char path[JVM_MAXPATHLEN];
3500 const char* fileSep = os::file_separator();
3501 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3502
3503 if (CheckEndorsedAndExtDirs) {
3504 int nonEmptyDirs = 0;
3505 // check endorsed directory
3506 nonEmptyDirs += check_non_empty_dirs(path);
3507 // check the extension directories
3508 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3509 if (nonEmptyDirs > 0) {
3510 return JNI_ERR;
3511 }
3512 }
3513
3514 DIR* dir = os::opendir(path);
3515 if (dir != NULL) {
3516 jio_fprintf(defaultStream::output_stream(),
3517 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3518 "in modular form will be supported via the concept of upgradeable modules.\n");
3519 os::closedir(dir);
3520 return JNI_ERR;
3521 }
3522
3523 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3524 dir = os::opendir(path);
3525 if (dir != NULL) {
3526 jio_fprintf(defaultStream::output_stream(),
3527 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3528 "Use -classpath instead.\n.");
3529 os::closedir(dir);
3530 return JNI_ERR;
3531 }
3532
3533 if (scp_assembly_required) {
3534 // Assemble the bootclasspath elements into the final path.
3535 Arguments::set_sysclasspath(scp_p->combined_path());
3536 }
3537
3538 // This must be done after all arguments have been processed.
3539 // java_compiler() true means set to "NONE" or empty.
3540 if (java_compiler() && !xdebug_mode()) {
3541 // For backwards compatibility, we switch to interpreted mode if
3542 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3543 // not specified.
3544 set_mode_flags(_int);
3545 }
3546
3547 if ((TieredCompilation && CompileThresholdScaling == 0)
3548 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3549 set_mode_flags(_int);
3550 }
3551
3552 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3553 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3554 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3555 }
3556
3557 #ifndef COMPILER2
3558 // Don't degrade server performance for footprint
3559 if (FLAG_IS_DEFAULT(UseLargePages) &&
3560 MaxHeapSize < LargePageHeapSizeThreshold) {
3561 // No need for large granularity pages w/small heaps.
3562 // Note that large pages are enabled/disabled for both the
3563 // Java heap and the code cache.
3564 FLAG_SET_DEFAULT(UseLargePages, false);
3565 }
3566
3567 #else
3568 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3569 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3570 }
3571 #endif
3572
3573 #ifndef TIERED
3574 // Tiered compilation is undefined.
3575 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3576 #endif
3577
3578 // If we are running in a headless jre, force java.awt.headless property
3579 // to be true unless the property has already been set.
3580 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3581 if (os::is_headless_jre()) {
3582 const char* headless = Arguments::get_property("java.awt.headless");
3583 if (headless == NULL) {
3584 char envbuffer[128];
3585 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3586 if (!add_property("java.awt.headless=true")) {
3587 return JNI_ENOMEM;
3588 }
3589 } else {
3590 char buffer[256];
3591 strcpy(buffer, "java.awt.headless=");
3592 strcat(buffer, envbuffer);
3593 if (!add_property(buffer)) {
3594 return JNI_ENOMEM;
3595 }
3596 }
3597 }
3598 }
3599
3600 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3601 // CMS can only be used with ParNew
3602 FLAG_SET_ERGO(bool, UseParNewGC, true);
3603 }
3604
3605 if (!check_vm_args_consistency()) {
3606 return JNI_ERR;
3607 }
3608
3609 return JNI_OK;
3610 }
3611
3612 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3613 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3614 scp_assembly_required_p);
3615 }
3616
3617 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3618 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3619 scp_assembly_required_p);
3620 }
3621
3622 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3623 const int N_MAX_OPTIONS = 64;
3624 const int OPTION_BUFFER_SIZE = 1024;
3625 char buffer[OPTION_BUFFER_SIZE];
3626
3627 // The variable will be ignored if it exceeds the length of the buffer.
3628 // Don't check this variable if user has special privileges
3629 // (e.g. unix su command).
3630 if (os::getenv(name, buffer, sizeof(buffer)) &&
3631 !os::have_special_privileges()) {
3632 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3633 jio_fprintf(defaultStream::error_stream(),
3634 "Picked up %s: %s\n", name, buffer);
3635 char* rd = buffer; // pointer to the input string (rd)
3636 int i;
3637 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3638 while (isspace(*rd)) rd++; // skip whitespace
3639 if (*rd == 0) break; // we re done when the input string is read completely
3640
3641 // The output, option string, overwrites the input string.
3642 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3643 // input string (rd).
3644 char* wrt = rd;
3645
3646 options[i++].optionString = wrt; // Fill in option
3647 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3648 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3649 int quote = *rd; // matching quote to look for
3650 rd++; // don't copy open quote
3651 while (*rd != quote) { // include everything (even spaces) up until quote
3652 if (*rd == 0) { // string termination means unmatched string
3653 jio_fprintf(defaultStream::error_stream(),
3654 "Unmatched quote in %s\n", name);
3655 return JNI_ERR;
3656 }
3657 *wrt++ = *rd++; // copy to option string
3658 }
3659 rd++; // don't copy close quote
3660 } else {
3661 *wrt++ = *rd++; // copy to option string
3662 }
3663 }
3664 // Need to check if we're done before writing a NULL,
3665 // because the write could be to the byte that rd is pointing to.
3666 if (*rd++ == 0) {
3667 *wrt = 0;
3668 break;
3669 }
3670 *wrt = 0; // Zero terminate option
3671 }
3672 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3673 JavaVMInitArgs vm_args;
3674 vm_args.version = JNI_VERSION_1_2;
3675 vm_args.options = options;
3676 vm_args.nOptions = i;
3677 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3678
3679 if (PrintVMOptions) {
3680 const char* tail;
3681 for (int i = 0; i < vm_args.nOptions; i++) {
3682 const JavaVMOption *option = vm_args.options + i;
3683 if (match_option(option, "-XX:", &tail)) {
3684 logOption(tail);
3685 }
3686 }
3687 }
3688
3689 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3690 }
3691 return JNI_OK;
3692 }
3693
3694 void Arguments::set_shared_spaces_flags() {
3695 if (DumpSharedSpaces) {
3696 if (RequireSharedSpaces) {
3697 warning("cannot dump shared archive while using shared archive");
3698 }
3699 UseSharedSpaces = false;
3700 #ifdef _LP64
3701 if (!UseCompressedOops || !UseCompressedClassPointers) {
3702 vm_exit_during_initialization(
3703 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3704 }
3705 } else {
3706 if (!UseCompressedOops || !UseCompressedClassPointers) {
3707 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3708 }
3709 #endif
3710 }
3711 }
3712
3713 #if !INCLUDE_ALL_GCS
3714 static void force_serial_gc() {
3715 FLAG_SET_DEFAULT(UseSerialGC, true);
3716 UNSUPPORTED_GC_OPTION(UseG1GC);
3717 UNSUPPORTED_GC_OPTION(UseParallelGC);
3718 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3719 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3720 UNSUPPORTED_GC_OPTION(UseParNewGC);
3721 }
3722 #endif // INCLUDE_ALL_GCS
3723
3724 // Sharing support
3725 // Construct the path to the archive
3726 static char* get_shared_archive_path() {
3727 char *shared_archive_path;
3728 if (SharedArchiveFile == NULL) {
3729 char jvm_path[JVM_MAXPATHLEN];
3730 os::jvm_path(jvm_path, sizeof(jvm_path));
3731 char *end = strrchr(jvm_path, *os::file_separator());
3732 if (end != NULL) *end = '\0';
3733 size_t jvm_path_len = strlen(jvm_path);
3734 size_t file_sep_len = strlen(os::file_separator());
3735 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3736 file_sep_len + 20, mtInternal);
3737 if (shared_archive_path != NULL) {
3738 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3739 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3740 strncat(shared_archive_path, "classes.jsa", 11);
3741 }
3742 } else {
3743 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3744 if (shared_archive_path != NULL) {
3745 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3746 }
3747 }
3748 return shared_archive_path;
3749 }
3750
3751 #ifndef PRODUCT
3752 // Determine whether LogVMOutput should be implicitly turned on.
3753 static bool use_vm_log() {
3754 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3755 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3756 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3757 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3758 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3759 return true;
3760 }
3761
3762 #ifdef COMPILER1
3763 if (PrintC1Statistics) {
3764 return true;
3765 }
3766 #endif // COMPILER1
3767
3768 #ifdef COMPILER2
3769 if (PrintOptoAssembly || PrintOptoStatistics) {
3770 return true;
3771 }
3772 #endif // COMPILER2
3773
3774 return false;
3775 }
3776 #endif // PRODUCT
3777
3778 // Parse entry point called from JNI_CreateJavaVM
3779
3780 jint Arguments::parse(const JavaVMInitArgs* args) {
3781
3782 // Remaining part of option string
3783 const char* tail;
3784
3785 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3786 const char* hotspotrc = ".hotspotrc";
3787 bool settings_file_specified = false;
3788 bool needs_hotspotrc_warning = false;
3789
3790 const char* flags_file;
3791 int index;
3792 for (index = 0; index < args->nOptions; index++) {
3793 const JavaVMOption *option = args->options + index;
3794 if (ArgumentsExt::process_options(option)) {
3795 continue;
3796 }
3797 if (match_option(option, "-XX:Flags=", &tail)) {
3798 flags_file = tail;
3799 settings_file_specified = true;
3800 continue;
3801 }
3802 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3803 PrintVMOptions = true;
3804 continue;
3805 }
3806 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3807 PrintVMOptions = false;
3808 continue;
3809 }
3810 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3811 IgnoreUnrecognizedVMOptions = true;
3812 continue;
3813 }
3814 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3815 IgnoreUnrecognizedVMOptions = false;
3816 continue;
3817 }
3818 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3819 CommandLineFlags::printFlags(tty, false);
3820 vm_exit(0);
3821 }
3822 #if INCLUDE_NMT
3823 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3824 // The launcher did not setup nmt environment variable properly.
3825 if (!MemTracker::check_launcher_nmt_support(tail)) {
3826 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3827 }
3828
3829 // Verify if nmt option is valid.
3830 if (MemTracker::verify_nmt_option()) {
3831 // Late initialization, still in single-threaded mode.
3832 if (MemTracker::tracking_level() >= NMT_summary) {
3833 MemTracker::init();
3834 }
3835 } else {
3836 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3837 }
3838 continue;
3839 }
3840 #endif
3841
3842
3843 #ifndef PRODUCT
3844 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3845 CommandLineFlags::printFlags(tty, true);
3846 vm_exit(0);
3847 }
3848 #endif
3849 }
3850
3851 if (IgnoreUnrecognizedVMOptions) {
3852 // uncast const to modify the flag args->ignoreUnrecognized
3853 *(jboolean*)(&args->ignoreUnrecognized) = true;
3854 }
3855
3856 // Parse specified settings file
3857 if (settings_file_specified) {
3858 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3859 return JNI_EINVAL;
3860 }
3861 } else {
3862 #ifdef ASSERT
3863 // Parse default .hotspotrc settings file
3864 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3865 return JNI_EINVAL;
3866 }
3867 #else
3868 struct stat buf;
3869 if (os::stat(hotspotrc, &buf) == 0) {
3870 needs_hotspotrc_warning = true;
3871 }
3872 #endif
3873 }
3874
3875 if (PrintVMOptions) {
3876 for (index = 0; index < args->nOptions; index++) {
3877 const JavaVMOption *option = args->options + index;
3878 if (match_option(option, "-XX:", &tail)) {
3879 logOption(tail);
3880 }
3881 }
3882 }
3883
3884 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3885 jint result = parse_vm_init_args(args);
3886 if (result != JNI_OK) {
3887 return result;
3888 }
3889
3890 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3891 SharedArchivePath = get_shared_archive_path();
3892 if (SharedArchivePath == NULL) {
3893 return JNI_ENOMEM;
3894 }
3895
3896 // Set up VerifySharedSpaces
3897 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3898 VerifySharedSpaces = true;
3899 }
3900
3901 // Delay warning until here so that we've had a chance to process
3902 // the -XX:-PrintWarnings flag
3903 if (needs_hotspotrc_warning) {
3904 warning("%s file is present but has been ignored. "
3905 "Run with -XX:Flags=%s to load the file.",
3906 hotspotrc, hotspotrc);
3907 }
3908
3909 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3910 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3911 #endif
3912
3913 #if INCLUDE_ALL_GCS
3914 #if (defined JAVASE_EMBEDDED || defined ARM)
3915 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3916 #endif
3917 #endif
3918
3919 #ifndef PRODUCT
3920 if (TraceBytecodesAt != 0) {
3921 TraceBytecodes = true;
3922 }
3923 if (CountCompiledCalls) {
3924 if (UseCounterDecay) {
3925 warning("UseCounterDecay disabled because CountCalls is set");
3926 UseCounterDecay = false;
3927 }
3928 }
3929 #endif // PRODUCT
3930
3931 if (ScavengeRootsInCode == 0) {
3932 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3933 warning("forcing ScavengeRootsInCode non-zero");
3934 }
3935 ScavengeRootsInCode = 1;
3936 }
3937
3938 if (PrintGCDetails) {
3939 // Turn on -verbose:gc options as well
3940 PrintGC = true;
3941 }
3942
3943 // Set object alignment values.
3944 set_object_alignment();
3945
3946 #if !INCLUDE_ALL_GCS
3947 force_serial_gc();
3948 #endif // INCLUDE_ALL_GCS
3949 #if !INCLUDE_CDS
3950 if (DumpSharedSpaces || RequireSharedSpaces) {
3951 jio_fprintf(defaultStream::error_stream(),
3952 "Shared spaces are not supported in this VM\n");
3953 return JNI_ERR;
3954 }
3955 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3956 warning("Shared spaces are not supported in this VM");
3957 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3958 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3959 }
3960 no_shared_spaces("CDS Disabled");
3961 #endif // INCLUDE_CDS
3962
3963 return JNI_OK;
3964 }
3965
3966 jint Arguments::apply_ergo() {
3967
3968 // Set flags based on ergonomics.
3969 set_ergonomics_flags();
3970
3971 set_shared_spaces_flags();
3972
3973 // Check the GC selections again.
3974 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3975 return JNI_EINVAL;
3976 }
3977
3978 if (TieredCompilation) {
3979 set_tiered_flags();
3980 } else {
3981 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3982 if (CompilationPolicyChoice >= 2) {
3983 vm_exit_during_initialization(
3984 "Incompatible compilation policy selected", NULL);
3985 }
3986 // Scale CompileThreshold
3987 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3988 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
3989 }
3990 }
3991
3992 #ifdef COMPILER2
3993 #ifndef PRODUCT
3994 if (PrintIdealGraphLevel > 0) {
3995 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3996 }
3997 #endif
3998 #endif
3999
4000 // Set heap size based on available physical memory
4001 set_heap_size();
4002
4003 ArgumentsExt::set_gc_specific_flags();
4004
4005 // Initialize Metaspace flags and alignments
4006 Metaspace::ergo_initialize();
4007
4008 // Set bytecode rewriting flags
4009 set_bytecode_flags();
4010
4011 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4012 set_aggressive_opts_flags();
4013
4014 // Turn off biased locking for locking debug mode flags,
4015 // which are subtly different from each other but neither works with
4016 // biased locking
4017 if (UseHeavyMonitors
4018 #ifdef COMPILER1
4019 || !UseFastLocking
4020 #endif // COMPILER1
4021 ) {
4022 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4023 // flag set to true on command line; warn the user that they
4024 // can't enable biased locking here
4025 warning("Biased Locking is not supported with locking debug flags"
4026 "; ignoring UseBiasedLocking flag." );
4027 }
4028 UseBiasedLocking = false;
4029 }
4030
4031 #ifdef ZERO
4032 // Clear flags not supported on zero.
4033 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4034 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4035 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4036 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4037 #endif // CC_INTERP
4038
4039 #ifdef COMPILER2
4040 if (!EliminateLocks) {
4041 EliminateNestedLocks = false;
4042 }
4043 if (!Inline) {
4044 IncrementalInline = false;
4045 }
4046 #ifndef PRODUCT
4047 if (!IncrementalInline) {
4048 AlwaysIncrementalInline = false;
4049 }
4050 #endif
4051 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4052 // nothing to use the profiling, turn if off
4053 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4054 }
4055 #endif
4056
4057 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4058 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4059 DebugNonSafepoints = true;
4060 }
4061
4062 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4063 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4064 }
4065
4066 #ifndef PRODUCT
4067 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4068 if (use_vm_log()) {
4069 LogVMOutput = true;
4070 }
4071 }
4072 #endif // PRODUCT
4073
4074 if (PrintCommandLineFlags) {
4075 CommandLineFlags::printSetFlags(tty);
4076 }
4077
4078 // Apply CPU specific policy for the BiasedLocking
4079 if (UseBiasedLocking) {
4080 if (!VM_Version::use_biased_locking() &&
4081 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4082 UseBiasedLocking = false;
4083 }
4084 }
4085 #ifdef COMPILER2
4086 if (!UseBiasedLocking || EmitSync != 0) {
4087 UseOptoBiasInlining = false;
4088 }
4089 #endif
4090
4091 return JNI_OK;
4092 }
4093
4094 jint Arguments::adjust_after_os() {
4095 if (UseNUMA) {
4096 if (UseParallelGC || UseParallelOldGC) {
4097 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4098 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4099 }
4100 }
4101 // UseNUMAInterleaving is set to ON for all collectors and
4102 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4103 // such as the parallel collector for Linux and Solaris will
4104 // interleave old gen and survivor spaces on top of NUMA
4105 // allocation policy for the eden space.
4106 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4107 // all platforms and ParallelGC on Windows will interleave all
4108 // of the heap spaces across NUMA nodes.
4109 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4110 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4111 }
4112 }
4113 return JNI_OK;
4114 }
4115
4116 int Arguments::PropertyList_count(SystemProperty* pl) {
4117 int count = 0;
4118 while(pl != NULL) {
4119 count++;
4120 pl = pl->next();
4121 }
4122 return count;
4123 }
4124
4125 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4126 assert(key != NULL, "just checking");
4127 SystemProperty* prop;
4128 for (prop = pl; prop != NULL; prop = prop->next()) {
4129 if (strcmp(key, prop->key()) == 0) return prop->value();
4130 }
4131 return NULL;
4132 }
4133
4134 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4135 int count = 0;
4136 const char* ret_val = NULL;
4137
4138 while(pl != NULL) {
4139 if(count >= index) {
4140 ret_val = pl->key();
4141 break;
4142 }
4143 count++;
4144 pl = pl->next();
4145 }
4146
4147 return ret_val;
4148 }
4149
4150 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4151 int count = 0;
4152 char* ret_val = NULL;
4153
4154 while(pl != NULL) {
4155 if(count >= index) {
4156 ret_val = pl->value();
4157 break;
4158 }
4159 count++;
4160 pl = pl->next();
4161 }
4162
4163 return ret_val;
4164 }
4165
4166 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4167 SystemProperty* p = *plist;
4168 if (p == NULL) {
4169 *plist = new_p;
4170 } else {
4171 while (p->next() != NULL) {
4172 p = p->next();
4173 }
4174 p->set_next(new_p);
4175 }
4176 }
4177
4178 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4179 if (plist == NULL)
4180 return;
4181
4182 SystemProperty* new_p = new SystemProperty(k, v, true);
4183 PropertyList_add(plist, new_p);
4184 }
4185
4186 // This add maintains unique property key in the list.
4187 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4188 if (plist == NULL)
4189 return;
4190
4191 // If property key exist then update with new value.
4192 SystemProperty* prop;
4193 for (prop = *plist; prop != NULL; prop = prop->next()) {
4194 if (strcmp(k, prop->key()) == 0) {
4195 if (append) {
4196 prop->append_value(v);
4197 } else {
4198 prop->set_value(v);
4199 }
4200 return;
4201 }
4202 }
4203
4204 PropertyList_add(plist, k, v);
4205 }
4206
4207 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4208 // Returns true if all of the source pointed by src has been copied over to
4209 // the destination buffer pointed by buf. Otherwise, returns false.
4210 // Notes:
4211 // 1. If the length (buflen) of the destination buffer excluding the
4212 // NULL terminator character is not long enough for holding the expanded
4213 // pid characters, it also returns false instead of returning the partially
4214 // expanded one.
4215 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4216 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4217 char* buf, size_t buflen) {
4218 const char* p = src;
4219 char* b = buf;
4220 const char* src_end = &src[srclen];
4221 char* buf_end = &buf[buflen - 1];
4222
4223 while (p < src_end && b < buf_end) {
4224 if (*p == '%') {
4225 switch (*(++p)) {
4226 case '%': // "%%" ==> "%"
4227 *b++ = *p++;
4228 break;
4229 case 'p': { // "%p" ==> current process id
4230 // buf_end points to the character before the last character so
4231 // that we could write '\0' to the end of the buffer.
4232 size_t buf_sz = buf_end - b + 1;
4233 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4234
4235 // if jio_snprintf fails or the buffer is not long enough to hold
4236 // the expanded pid, returns false.
4237 if (ret < 0 || ret >= (int)buf_sz) {
4238 return false;
4239 } else {
4240 b += ret;
4241 assert(*b == '\0', "fail in copy_expand_pid");
4242 if (p == src_end && b == buf_end + 1) {
4243 // reach the end of the buffer.
4244 return true;
4245 }
4246 }
4247 p++;
4248 break;
4249 }
4250 default :
4251 *b++ = '%';
4252 }
4253 } else {
4254 *b++ = *p++;
4255 }
4256 }
4257 *b = '\0';
4258 return (p == src_end); // return false if not all of the source was copied
4259 }