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::_java_ext_dirs = NULL;
119 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
120 SystemProperty *Arguments::_sun_boot_library_path = NULL;
121 SystemProperty *Arguments::_java_library_path = NULL;
122 SystemProperty *Arguments::_java_home = NULL;
123 SystemProperty *Arguments::_java_class_path = NULL;
124 SystemProperty *Arguments::_sun_boot_class_path = NULL;
125
126 char* Arguments::_meta_index_path = NULL;
127 char* Arguments::_meta_index_dir = NULL;
128
129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
130
131 static bool match_option(const JavaVMOption *option, const char* name,
132 const char** tail) {
133 int len = (int)strlen(name);
134 if (strncmp(option->optionString, name, len) == 0) {
135 *tail = option->optionString + len;
136 return true;
137 } else {
138 return false;
139 }
140 }
141
142 static void logOption(const char* opt) {
143 if (PrintVMOptions) {
144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
145 }
146 }
147
148 // Process java launcher properties.
149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
150 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
151 // sun.java.launcher.pid is defined.
152 // Must do this before setting up other system properties,
153 // as some of them may depend on launcher type.
154 for (int index = 0; index < args->nOptions; index++) {
155 const JavaVMOption* option = args->options + index;
156 const char* tail;
157
158 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
159 process_java_launcher_argument(tail, option->extraInfo);
160 continue;
161 }
162 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
163 if (strcmp(tail, "true") == 0) {
164 _sun_java_launcher_is_altjvm = true;
165 }
166 continue;
167 }
168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
169 _sun_java_launcher_pid = atoi(tail);
170 continue;
171 }
172 }
173 }
174
175 // Initialize system properties key and value.
176 void Arguments::init_system_properties() {
177
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
179 "Java Virtual Machine Specification", false));
180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
183
184 // Following are JVMTI agent writable properties.
185 // Properties values are set to NULL and they are
186 // os specific they are initialized in os::init_system_properties_values().
187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
190 _java_library_path = new SystemProperty("java.library.path", NULL, true);
191 _java_home = new SystemProperty("java.home", NULL, true);
192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
193
194 _java_class_path = new SystemProperty("java.class.path", "", true);
195
196 // Add to System Property list.
197 PropertyList_add(&_system_properties, _java_ext_dirs);
198 PropertyList_add(&_system_properties, _java_endorsed_dirs);
199 PropertyList_add(&_system_properties, _sun_boot_library_path);
200 PropertyList_add(&_system_properties, _java_library_path);
201 PropertyList_add(&_system_properties, _java_home);
202 PropertyList_add(&_system_properties, _java_class_path);
203 PropertyList_add(&_system_properties, _sun_boot_class_path);
204
205 // Set OS specific system properties values
206 os::init_system_properties_values();
207 }
208
209
210 // Update/Initialize System properties after JDK version number is known
211 void Arguments::init_version_specific_system_properties() {
212 enum { bufsz = 16 };
213 char buffer[bufsz];
214 const char* spec_vendor = "Sun Microsystems Inc.";
215 uint32_t spec_version = 0;
216
217 spec_vendor = "Oracle Corporation";
218 spec_version = JDK_Version::current().major_version();
219 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
220
221 PropertyList_add(&_system_properties,
222 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
223 PropertyList_add(&_system_properties,
224 new SystemProperty("java.vm.specification.version", buffer, false));
225 PropertyList_add(&_system_properties,
226 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
227 }
228
229 /**
230 * Provide a slightly more user-friendly way of eliminating -XX flags.
231 * When a flag is eliminated, it can be added to this list in order to
232 * continue accepting this flag on the command-line, while issuing a warning
233 * and ignoring the value. Once the JDK version reaches the 'accept_until'
234 * limit, we flatly refuse to admit the existence of the flag. This allows
235 * a flag to die correctly over JDK releases using HSX.
236 */
237 typedef struct {
238 const char* name;
239 JDK_Version obsoleted_in; // when the flag went away
240 JDK_Version accept_until; // which version to start denying the existence
241 } ObsoleteFlag;
242
243 static ObsoleteFlag obsolete_jvm_flags[] = {
244 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
258 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
259 { "DefaultInitialRAMFraction",
260 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
261 { "UseDepthFirstScavengeOrder",
262 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
263 { "HandlePromotionFailure",
264 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
265 { "MaxLiveObjectEvacuationRatio",
266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
267 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
268 { "UseParallelOldGCCompacting",
269 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
270 { "UseParallelDensePrefixUpdate",
271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
272 { "UseParallelOldGCDensePrefix",
273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
274 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
275 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
276 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
295 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
296 #ifdef PRODUCT
297 { "DesiredMethodLimit",
298 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
299 #endif // PRODUCT
300 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
307 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
308 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
310 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 #ifndef ZERO
313 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
315 #endif // ZERO
316 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
317 { NULL, JDK_Version(0), JDK_Version(0) }
318 };
319
320 // Returns true if the flag is obsolete and fits into the range specified
321 // for being ignored. In the case that the flag is ignored, the 'version'
322 // value is filled in with the version number when the flag became
323 // obsolete so that that value can be displayed to the user.
324 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
325 int i = 0;
326 assert(version != NULL, "Must provide a version buffer");
327 while (obsolete_jvm_flags[i].name != NULL) {
328 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
329 // <flag>=xxx form
330 // [-|+]<flag> form
331 size_t len = strlen(flag_status.name);
332 if (((strncmp(flag_status.name, s, len) == 0) &&
333 (strlen(s) == len)) ||
334 ((s[0] == '+' || s[0] == '-') &&
335 (strncmp(flag_status.name, &s[1], len) == 0) &&
336 (strlen(&s[1]) == len))) {
337 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
338 *version = flag_status.obsoleted_in;
339 return true;
340 }
341 }
342 i++;
343 }
344 return false;
345 }
346
347 // Constructs the system class path (aka boot class path) from the following
348 // components, in order:
349 //
350 // prefix // from -Xbootclasspath/p:...
351 // endorsed // the expansion of -Djava.endorsed.dirs=...
352 // base // from os::get_system_properties() or -Xbootclasspath=
353 // suffix // from -Xbootclasspath/a:...
354 //
355 // java.endorsed.dirs is a list of directories; any jar or zip files in the
356 // directories are added to the sysclasspath just before the base.
357 //
358 // This could be AllStatic, but it isn't needed after argument processing is
359 // complete.
360 class SysClassPath: public StackObj {
361 public:
362 SysClassPath(const char* base);
363 ~SysClassPath();
364
365 inline void set_base(const char* base);
366 inline void add_prefix(const char* prefix);
367 inline void add_suffix_to_prefix(const char* suffix);
368 inline void add_suffix(const char* suffix);
369 inline void reset_path(const char* base);
370
371 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
372 // property. Must be called after all command-line arguments have been
373 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
374 // combined_path().
375 void expand_endorsed();
376
377 inline const char* get_base() const { return _items[_scp_base]; }
378 inline const char* get_prefix() const { return _items[_scp_prefix]; }
379 inline const char* get_suffix() const { return _items[_scp_suffix]; }
380 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
381
382 // Combine all the components into a single c-heap-allocated string; caller
383 // must free the string if/when no longer needed.
384 char* combined_path();
385
386 private:
387 // Utility routines.
388 static char* add_to_path(const char* path, const char* str, bool prepend);
389 static char* add_jars_to_path(char* path, const char* directory);
390
391 inline void reset_item_at(int index);
392
393 // Array indices for the items that make up the sysclasspath. All except the
394 // base are allocated in the C heap and freed by this class.
395 enum {
396 _scp_prefix, // from -Xbootclasspath/p:...
397 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
398 _scp_base, // the default sysclasspath
399 _scp_suffix, // from -Xbootclasspath/a:...
400 _scp_nitems // the number of items, must be last.
401 };
402
403 const char* _items[_scp_nitems];
404 DEBUG_ONLY(bool _expansion_done;)
405 };
406
407 SysClassPath::SysClassPath(const char* base) {
408 memset(_items, 0, sizeof(_items));
409 _items[_scp_base] = base;
410 DEBUG_ONLY(_expansion_done = false;)
411 }
412
413 SysClassPath::~SysClassPath() {
414 // Free everything except the base.
415 for (int i = 0; i < _scp_nitems; ++i) {
416 if (i != _scp_base) reset_item_at(i);
417 }
418 DEBUG_ONLY(_expansion_done = false;)
419 }
420
421 inline void SysClassPath::set_base(const char* base) {
422 _items[_scp_base] = base;
423 }
424
425 inline void SysClassPath::add_prefix(const char* prefix) {
426 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
427 }
428
429 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
430 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
431 }
432
433 inline void SysClassPath::add_suffix(const char* suffix) {
434 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
435 }
436
437 inline void SysClassPath::reset_item_at(int index) {
438 assert(index < _scp_nitems && index != _scp_base, "just checking");
439 if (_items[index] != NULL) {
440 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
441 _items[index] = NULL;
442 }
443 }
444
445 inline void SysClassPath::reset_path(const char* base) {
446 // Clear the prefix and suffix.
447 reset_item_at(_scp_prefix);
448 reset_item_at(_scp_suffix);
449 set_base(base);
450 }
451
452 //------------------------------------------------------------------------------
453
454 void SysClassPath::expand_endorsed() {
455 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
456
457 const char* path = Arguments::get_property("java.endorsed.dirs");
458 if (path == NULL) {
459 path = Arguments::get_endorsed_dir();
460 assert(path != NULL, "no default for java.endorsed.dirs");
461 }
462
463 char* expanded_path = NULL;
464 const char separator = *os::path_separator();
465 const char* const end = path + strlen(path);
466 while (path < end) {
467 const char* tmp_end = strchr(path, separator);
468 if (tmp_end == NULL) {
469 expanded_path = add_jars_to_path(expanded_path, path);
470 path = end;
471 } else {
472 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
473 memcpy(dirpath, path, tmp_end - path);
474 dirpath[tmp_end - path] = '\0';
475 expanded_path = add_jars_to_path(expanded_path, dirpath);
476 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
477 path = tmp_end + 1;
478 }
479 }
480 _items[_scp_endorsed] = expanded_path;
481 DEBUG_ONLY(_expansion_done = true;)
482 }
483
484 // Combine the bootclasspath elements, some of which may be null, into a single
485 // c-heap-allocated string.
486 char* SysClassPath::combined_path() {
487 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
488 assert(_expansion_done, "must call expand_endorsed() first.");
489
490 size_t lengths[_scp_nitems];
491 size_t total_len = 0;
492
493 const char separator = *os::path_separator();
494
495 // Get the lengths.
496 int i;
497 for (i = 0; i < _scp_nitems; ++i) {
498 if (_items[i] != NULL) {
499 lengths[i] = strlen(_items[i]);
500 // Include space for the separator char (or a NULL for the last item).
501 total_len += lengths[i] + 1;
502 }
503 }
504 assert(total_len > 0, "empty sysclasspath not allowed");
505
506 // Copy the _items to a single string.
507 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
508 char* cp_tmp = cp;
509 for (i = 0; i < _scp_nitems; ++i) {
510 if (_items[i] != NULL) {
511 memcpy(cp_tmp, _items[i], lengths[i]);
512 cp_tmp += lengths[i];
513 *cp_tmp++ = separator;
514 }
515 }
516 *--cp_tmp = '\0'; // Replace the extra separator.
517 return cp;
518 }
519
520 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
521 char*
522 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
523 char *cp;
524
525 assert(str != NULL, "just checking");
526 if (path == NULL) {
527 size_t len = strlen(str) + 1;
528 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
529 memcpy(cp, str, len); // copy the trailing null
530 } else {
531 const char separator = *os::path_separator();
532 size_t old_len = strlen(path);
533 size_t str_len = strlen(str);
534 size_t len = old_len + str_len + 2;
535
536 if (prepend) {
537 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
538 char* cp_tmp = cp;
539 memcpy(cp_tmp, str, str_len);
540 cp_tmp += str_len;
541 *cp_tmp = separator;
542 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
543 FREE_C_HEAP_ARRAY(char, path, mtInternal);
544 } else {
545 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
546 char* cp_tmp = cp + old_len;
547 *cp_tmp = separator;
548 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
549 }
550 }
551 return cp;
552 }
553
554 // Scan the directory and append any jar or zip files found to path.
555 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
556 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
557 DIR* dir = os::opendir(directory);
558 if (dir == NULL) return path;
559
560 char dir_sep[2] = { '\0', '\0' };
561 size_t directory_len = strlen(directory);
562 const char fileSep = *os::file_separator();
563 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
564
565 /* Scan the directory for jars/zips, appending them to path. */
566 struct dirent *entry;
567 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
568 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
569 const char* name = entry->d_name;
570 const char* ext = name + strlen(name) - 4;
571 bool isJarOrZip = ext > name &&
572 (os::file_name_strcmp(ext, ".jar") == 0 ||
573 os::file_name_strcmp(ext, ".zip") == 0);
574 if (isJarOrZip) {
575 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
576 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
577 path = add_to_path(path, jarpath, false);
578 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
579 }
580 }
581 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
582 os::closedir(dir);
583 return path;
584 }
585
586 // Parses a memory size specification string.
587 static bool atomull(const char *s, julong* result) {
588 julong n = 0;
589 int args_read = 0;
590 bool is_hex = false;
591 // Skip leading 0[xX] for hexadecimal
592 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
593 s += 2;
594 is_hex = true;
595 args_read = sscanf(s, JULONG_FORMAT_X, &n);
596 } else {
597 args_read = sscanf(s, JULONG_FORMAT, &n);
598 }
599 if (args_read != 1) {
600 return false;
601 }
602 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
603 s++;
604 }
605 // 4705540: illegal if more characters are found after the first non-digit
606 if (strlen(s) > 1) {
607 return false;
608 }
609 switch (*s) {
610 case 'T': case 't':
611 *result = n * G * K;
612 // Check for overflow.
613 if (*result/((julong)G * K) != n) return false;
614 return true;
615 case 'G': case 'g':
616 *result = n * G;
617 if (*result/G != n) return false;
618 return true;
619 case 'M': case 'm':
620 *result = n * M;
621 if (*result/M != n) return false;
622 return true;
623 case 'K': case 'k':
624 *result = n * K;
625 if (*result/K != n) return false;
626 return true;
627 case '\0':
628 *result = n;
629 return true;
630 default:
631 return false;
632 }
633 }
634
635 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
636 if (size < min_size) return arg_too_small;
637 // Check that size will fit in a size_t (only relevant on 32-bit)
638 if (size > max_uintx) return arg_too_big;
639 return arg_in_range;
640 }
641
642 // Describe an argument out of range error
643 void Arguments::describe_range_error(ArgsRange errcode) {
644 switch(errcode) {
645 case arg_too_big:
646 jio_fprintf(defaultStream::error_stream(),
647 "The specified size exceeds the maximum "
648 "representable size.\n");
649 break;
650 case arg_too_small:
651 case arg_unreadable:
652 case arg_in_range:
653 // do nothing for now
654 break;
655 default:
656 ShouldNotReachHere();
657 }
658 }
659
660 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
661 return CommandLineFlags::boolAtPut(name, &value, origin);
662 }
663
664 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
665 double v;
666 if (sscanf(value, "%lf", &v) != 1) {
667 return false;
668 }
669
670 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
671 return true;
672 }
673 return false;
674 }
675
676 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
677 julong v;
678 intx intx_v;
679 bool is_neg = false;
680 // Check the sign first since atomull() parses only unsigned values.
681 if (*value == '-') {
682 if (!CommandLineFlags::intxAt(name, &intx_v)) {
683 return false;
684 }
685 value++;
686 is_neg = true;
687 }
688 if (!atomull(value, &v)) {
689 return false;
690 }
691 intx_v = (intx) v;
692 if (is_neg) {
693 intx_v = -intx_v;
694 }
695 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
696 return true;
697 }
698 uintx uintx_v = (uintx) v;
699 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
700 return true;
701 }
702 uint64_t uint64_t_v = (uint64_t) v;
703 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
704 return true;
705 }
706 size_t size_t_v = (size_t) v;
707 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
708 return true;
709 }
710 return false;
711 }
712
713 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
714 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
715 // Contract: CommandLineFlags always returns a pointer that needs freeing.
716 FREE_C_HEAP_ARRAY(char, value, mtInternal);
717 return true;
718 }
719
720 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
721 const char* old_value = "";
722 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
723 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
724 size_t new_len = strlen(new_value);
725 const char* value;
726 char* free_this_too = NULL;
727 if (old_len == 0) {
728 value = new_value;
729 } else if (new_len == 0) {
730 value = old_value;
731 } else {
732 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
733 // each new setting adds another LINE to the switch:
734 sprintf(buf, "%s\n%s", old_value, new_value);
735 value = buf;
736 free_this_too = buf;
737 }
738 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
739 // CommandLineFlags always returns a pointer that needs freeing.
740 FREE_C_HEAP_ARRAY(char, value, mtInternal);
741 if (free_this_too != NULL) {
742 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
743 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
744 }
745 return true;
746 }
747
748 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
749
750 // range of acceptable characters spelled out for portability reasons
751 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
752 #define BUFLEN 255
753 char name[BUFLEN+1];
754 char dummy;
755
756 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
757 return set_bool_flag(name, false, origin);
758 }
759 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
760 return set_bool_flag(name, true, origin);
761 }
762
763 char punct;
764 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
765 const char* value = strchr(arg, '=') + 1;
766 Flag* flag = Flag::find_flag(name, strlen(name));
767 if (flag != NULL && flag->is_ccstr()) {
768 if (flag->ccstr_accumulates()) {
769 return append_to_string_flag(name, value, origin);
770 } else {
771 if (value[0] == '\0') {
772 value = NULL;
773 }
774 return set_string_flag(name, value, origin);
775 }
776 }
777 }
778
779 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
780 const char* value = strchr(arg, '=') + 1;
781 // -XX:Foo:=xxx will reset the string flag to the given value.
782 if (value[0] == '\0') {
783 value = NULL;
784 }
785 return set_string_flag(name, value, origin);
786 }
787
788 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
789 #define SIGNED_NUMBER_RANGE "[-0123456789]"
790 #define NUMBER_RANGE "[0123456789]"
791 char value[BUFLEN + 1];
792 char value2[BUFLEN + 1];
793 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
794 // Looks like a floating-point number -- try again with more lenient format string
795 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
796 return set_fp_numeric_flag(name, value, origin);
797 }
798 }
799
800 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
801 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
802 return set_numeric_flag(name, value, origin);
803 }
804
805 return false;
806 }
807
808 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
809 assert(bldarray != NULL, "illegal argument");
810
811 if (arg == NULL) {
812 return;
813 }
814
815 int new_count = *count + 1;
816
817 // expand the array and add arg to the last element
818 if (*bldarray == NULL) {
819 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
820 } else {
821 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
822 }
823 (*bldarray)[*count] = os::strdup_check_oom(arg);
824 *count = new_count;
825 }
826
827 void Arguments::build_jvm_args(const char* arg) {
828 add_string(&_jvm_args_array, &_num_jvm_args, arg);
829 }
830
831 void Arguments::build_jvm_flags(const char* arg) {
832 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
833 }
834
835 // utility function to return a string that concatenates all
836 // strings in a given char** array
837 const char* Arguments::build_resource_string(char** args, int count) {
838 if (args == NULL || count == 0) {
839 return NULL;
840 }
841 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
842 for (int i = 1; i < count; i++) {
843 length += strlen(args[i]) + 1; // add 1 for a space
844 }
845 char* s = NEW_RESOURCE_ARRAY(char, length);
846 strcpy(s, args[0]);
847 for (int j = 1; j < count; j++) {
848 strcat(s, " ");
849 strcat(s, args[j]);
850 }
851 return (const char*) s;
852 }
853
854 void Arguments::print_on(outputStream* st) {
855 st->print_cr("VM Arguments:");
856 if (num_jvm_flags() > 0) {
857 st->print("jvm_flags: "); print_jvm_flags_on(st);
858 }
859 if (num_jvm_args() > 0) {
860 st->print("jvm_args: "); print_jvm_args_on(st);
861 }
862 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
863 if (_java_class_path != NULL) {
864 char* path = _java_class_path->value();
865 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
866 }
867 st->print_cr("Launcher Type: %s", _sun_java_launcher);
868 }
869
870 void Arguments::print_jvm_flags_on(outputStream* st) {
871 if (_num_jvm_flags > 0) {
872 for (int i=0; i < _num_jvm_flags; i++) {
873 st->print("%s ", _jvm_flags_array[i]);
874 }
875 st->cr();
876 }
877 }
878
879 void Arguments::print_jvm_args_on(outputStream* st) {
880 if (_num_jvm_args > 0) {
881 for (int i=0; i < _num_jvm_args; i++) {
882 st->print("%s ", _jvm_args_array[i]);
883 }
884 st->cr();
885 }
886 }
887
888 bool Arguments::process_argument(const char* arg,
889 jboolean ignore_unrecognized, Flag::Flags origin) {
890
891 JDK_Version since = JDK_Version();
892
893 if (parse_argument(arg, origin) || ignore_unrecognized) {
894 return true;
895 }
896
897 bool has_plus_minus = (*arg == '+' || *arg == '-');
898 const char* const argname = has_plus_minus ? arg + 1 : arg;
899 if (is_newly_obsolete(arg, &since)) {
900 char version[256];
901 since.to_string(version, sizeof(version));
902 warning("ignoring option %s; support was removed in %s", argname, version);
903 return true;
904 }
905
906 // For locked flags, report a custom error message if available.
907 // Otherwise, report the standard unrecognized VM option.
908
909 size_t arg_len;
910 const char* equal_sign = strchr(argname, '=');
911 if (equal_sign == NULL) {
912 arg_len = strlen(argname);
913 } else {
914 arg_len = equal_sign - argname;
915 }
916
917 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
918 if (found_flag != NULL) {
919 char locked_message_buf[BUFLEN];
920 found_flag->get_locked_message(locked_message_buf, BUFLEN);
921 if (strlen(locked_message_buf) == 0) {
922 if (found_flag->is_bool() && !has_plus_minus) {
923 jio_fprintf(defaultStream::error_stream(),
924 "Missing +/- setting for VM option '%s'\n", argname);
925 } else if (!found_flag->is_bool() && has_plus_minus) {
926 jio_fprintf(defaultStream::error_stream(),
927 "Unexpected +/- setting in VM option '%s'\n", argname);
928 } else {
929 jio_fprintf(defaultStream::error_stream(),
930 "Improperly specified VM option '%s'\n", argname);
931 }
932 } else {
933 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
934 }
935 } else {
936 jio_fprintf(defaultStream::error_stream(),
937 "Unrecognized VM option '%s'\n", argname);
938 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
939 if (fuzzy_matched != NULL) {
940 jio_fprintf(defaultStream::error_stream(),
941 "Did you mean '%s%s%s'? ",
942 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
943 fuzzy_matched->_name,
944 (fuzzy_matched->is_bool()) ? "" : "=<value>");
945 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
946 char version[256];
947 since.to_string(version, sizeof(version));
948 jio_fprintf(defaultStream::error_stream(),
949 "Warning: support for %s was removed in %s\n",
950 fuzzy_matched->_name,
951 version);
952 }
953 }
954 }
955
956 // allow for commandline "commenting out" options like -XX:#+Verbose
957 return arg[0] == '#';
958 }
959
960 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
961 FILE* stream = fopen(file_name, "rb");
962 if (stream == NULL) {
963 if (should_exist) {
964 jio_fprintf(defaultStream::error_stream(),
965 "Could not open settings file %s\n", file_name);
966 return false;
967 } else {
968 return true;
969 }
970 }
971
972 char token[1024];
973 int pos = 0;
974
975 bool in_white_space = true;
976 bool in_comment = false;
977 bool in_quote = false;
978 char quote_c = 0;
979 bool result = true;
980
981 int c = getc(stream);
982 while(c != EOF && pos < (int)(sizeof(token)-1)) {
983 if (in_white_space) {
984 if (in_comment) {
985 if (c == '\n') in_comment = false;
986 } else {
987 if (c == '#') in_comment = true;
988 else if (!isspace(c)) {
989 in_white_space = false;
990 token[pos++] = c;
991 }
992 }
993 } else {
994 if (c == '\n' || (!in_quote && isspace(c))) {
995 // token ends at newline, or at unquoted whitespace
996 // this allows a way to include spaces in string-valued options
997 token[pos] = '\0';
998 logOption(token);
999 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1000 build_jvm_flags(token);
1001 pos = 0;
1002 in_white_space = true;
1003 in_quote = false;
1004 } else if (!in_quote && (c == '\'' || c == '"')) {
1005 in_quote = true;
1006 quote_c = c;
1007 } else if (in_quote && (c == quote_c)) {
1008 in_quote = false;
1009 } else {
1010 token[pos++] = c;
1011 }
1012 }
1013 c = getc(stream);
1014 }
1015 if (pos > 0) {
1016 token[pos] = '\0';
1017 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1018 build_jvm_flags(token);
1019 }
1020 fclose(stream);
1021 return result;
1022 }
1023
1024 //=============================================================================================================
1025 // Parsing of properties (-D)
1026
1027 const char* Arguments::get_property(const char* key) {
1028 return PropertyList_get_value(system_properties(), key);
1029 }
1030
1031 bool Arguments::add_property(const char* prop) {
1032 const char* eq = strchr(prop, '=');
1033 char* key;
1034 // ns must be static--its address may be stored in a SystemProperty object.
1035 const static char ns[1] = {0};
1036 char* value = (char *)ns;
1037
1038 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1039 key = AllocateHeap(key_len + 1, mtInternal);
1040 strncpy(key, prop, key_len);
1041 key[key_len] = '\0';
1042
1043 if (eq != NULL) {
1044 size_t value_len = strlen(prop) - key_len - 1;
1045 value = AllocateHeap(value_len + 1, mtInternal);
1046 strncpy(value, &prop[key_len + 1], value_len + 1);
1047 }
1048
1049 if (strcmp(key, "java.compiler") == 0) {
1050 process_java_compiler_argument(value);
1051 FreeHeap(key);
1052 if (eq != NULL) {
1053 FreeHeap(value);
1054 }
1055 return true;
1056 } else if (strcmp(key, "sun.java.command") == 0) {
1057 _java_command = value;
1058
1059 // Record value in Arguments, but let it get passed to Java.
1060 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1061 strcmp(key, "sun.java.launcher.pid") == 0) {
1062 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1063 // private and are processed in process_sun_java_launcher_properties();
1064 // the sun.java.launcher property is passed on to the java application
1065 FreeHeap(key);
1066 if (eq != NULL) {
1067 FreeHeap(value);
1068 }
1069 return true;
1070 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1071 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1072 // its value without going through the property list or making a Java call.
1073 _java_vendor_url_bug = value;
1074 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1075 PropertyList_unique_add(&_system_properties, key, value, true);
1076 return true;
1077 }
1078 // Create new property and add at the end of the list
1079 PropertyList_unique_add(&_system_properties, key, value);
1080 return true;
1081 }
1082
1083 //===========================================================================================================
1084 // Setting int/mixed/comp mode flags
1085
1086 void Arguments::set_mode_flags(Mode mode) {
1087 // Set up default values for all flags.
1088 // If you add a flag to any of the branches below,
1089 // add a default value for it here.
1090 set_java_compiler(false);
1091 _mode = mode;
1092
1093 // Ensure Agent_OnLoad has the correct initial values.
1094 // This may not be the final mode; mode may change later in onload phase.
1095 PropertyList_unique_add(&_system_properties, "java.vm.info",
1096 (char*)VM_Version::vm_info_string(), false);
1097
1098 UseInterpreter = true;
1099 UseCompiler = true;
1100 UseLoopCounter = true;
1101
1102 // Default values may be platform/compiler dependent -
1103 // use the saved values
1104 ClipInlining = Arguments::_ClipInlining;
1105 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1106 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1107 BackgroundCompilation = Arguments::_BackgroundCompilation;
1108
1109 // Change from defaults based on mode
1110 switch (mode) {
1111 default:
1112 ShouldNotReachHere();
1113 break;
1114 case _int:
1115 UseCompiler = false;
1116 UseLoopCounter = false;
1117 AlwaysCompileLoopMethods = false;
1118 UseOnStackReplacement = false;
1119 break;
1120 case _mixed:
1121 // same as default
1122 break;
1123 case _comp:
1124 UseInterpreter = false;
1125 BackgroundCompilation = false;
1126 ClipInlining = false;
1127 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1128 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1129 // compile a level 4 (C2) and then continue executing it.
1130 if (TieredCompilation) {
1131 Tier3InvokeNotifyFreqLog = 0;
1132 Tier4InvocationThreshold = 0;
1133 }
1134 break;
1135 }
1136 }
1137
1138 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1139 // Conflict: required to use shared spaces (-Xshare:on), but
1140 // incompatible command line options were chosen.
1141
1142 static void no_shared_spaces(const char* message) {
1143 if (RequireSharedSpaces) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Class data sharing is inconsistent with other specified options.\n");
1146 vm_exit_during_initialization("Unable to use shared archive.", message);
1147 } else {
1148 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1149 }
1150 }
1151 #endif
1152
1153 // Returns threshold scaled with CompileThresholdScaling
1154 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1155 return (intx)(threshold * CompileThresholdScaling);
1156 }
1157
1158 // Returns freq_log scaled with CompileThresholdScaling
1159 intx Arguments::get_scaled_freq_log(intx freq_log) {
1160 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1161 if (scaled_freq == 0) {
1162 return 0;
1163 } else {
1164 return log2_intptr(scaled_freq);
1165 }
1166 }
1167
1168 void Arguments::set_tiered_flags() {
1169 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1170 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1171 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1172 }
1173 if (CompilationPolicyChoice < 2) {
1174 vm_exit_during_initialization(
1175 "Incompatible compilation policy selected", NULL);
1176 }
1177 // Increase the code cache size - tiered compiles a lot more.
1178 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1179 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1180 }
1181 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1182 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1183 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1184
1185 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1186 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1187 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1188 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1189 }
1190 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1191 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1192 }
1193 // Check consistency of code heap sizes
1194 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1195 jio_fprintf(defaultStream::error_stream(),
1196 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1197 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1198 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1199 vm_exit(1);
1200 }
1201 }
1202 }
1203 if (!UseInterpreter) { // -Xcomp
1204 Tier3InvokeNotifyFreqLog = 0;
1205 Tier4InvocationThreshold = 0;
1206 }
1207 // Scale tiered compilation thresholds
1208 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1209 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1210 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1211
1212 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1213 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1214 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1215 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1216
1217 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1218 // once these thresholds become supported.
1219
1220 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1221 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1222
1223 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1224 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1225
1226 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1227
1228 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1229 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1230 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1231 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1232 }
1233 }
1234
1235 /**
1236 * Returns the minimum number of compiler threads needed to run the JVM. The following
1237 * configurations are possible.
1238 *
1239 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1240 * compiler threads is 0.
1241 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1242 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1243 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1244 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1245 * C1 can be used, so the minimum number of compiler threads is 1.
1246 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1247 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1248 * the minimum number of compiler threads is 2.
1249 */
1250 int Arguments::get_min_number_of_compiler_threads() {
1251 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1252 return 0; // case 1
1253 #else
1254 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1255 return 1; // case 2 or case 3
1256 }
1257 return 2; // case 4 (tiered)
1258 #endif
1259 }
1260
1261 #if INCLUDE_ALL_GCS
1262 static void disable_adaptive_size_policy(const char* collector_name) {
1263 if (UseAdaptiveSizePolicy) {
1264 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1265 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1266 collector_name);
1267 }
1268 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1269 }
1270 }
1271
1272 void Arguments::set_parnew_gc_flags() {
1273 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1274 "control point invariant");
1275 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1276 assert(UseParNewGC, "ParNew should always be used with CMS");
1277
1278 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1279 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1280 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1281 } else if (ParallelGCThreads == 0) {
1282 jio_fprintf(defaultStream::error_stream(),
1283 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1284 vm_exit(1);
1285 }
1286
1287 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1288 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1289 // we set them to 1024 and 1024.
1290 // See CR 6362902.
1291 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1292 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1293 }
1294 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1295 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1296 }
1297
1298 // When using compressed oops, we use local overflow stacks,
1299 // rather than using a global overflow list chained through
1300 // the klass word of the object's pre-image.
1301 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1302 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1303 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1304 }
1305 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1306 }
1307 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1308 }
1309
1310 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1311 // sparc/solaris for certain applications, but would gain from
1312 // further optimization and tuning efforts, and would almost
1313 // certainly gain from analysis of platform and environment.
1314 void Arguments::set_cms_and_parnew_gc_flags() {
1315 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1316 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1317 assert(UseParNewGC, "ParNew should always be used with CMS");
1318
1319 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1320 disable_adaptive_size_policy("UseConcMarkSweepGC");
1321
1322 set_parnew_gc_flags();
1323
1324 size_t max_heap = align_size_down(MaxHeapSize,
1325 CardTableRS::ct_max_alignment_constraint());
1326
1327 // Now make adjustments for CMS
1328 intx tenuring_default = (intx)6;
1329 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1330
1331 // Preferred young gen size for "short" pauses:
1332 // upper bound depends on # of threads and NewRatio.
1333 const uintx parallel_gc_threads =
1334 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1335 const size_t preferred_max_new_size_unaligned =
1336 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1337 size_t preferred_max_new_size =
1338 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1339
1340 // Unless explicitly requested otherwise, size young gen
1341 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1342
1343 // If either MaxNewSize or NewRatio is set on the command line,
1344 // assume the user is trying to set the size of the young gen.
1345 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1346
1347 // Set MaxNewSize to our calculated preferred_max_new_size unless
1348 // NewSize was set on the command line and it is larger than
1349 // preferred_max_new_size.
1350 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1351 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1352 } else {
1353 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1354 }
1355 if (PrintGCDetails && Verbose) {
1356 // Too early to use gclog_or_tty
1357 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1358 }
1359
1360 // Code along this path potentially sets NewSize and OldSize
1361 if (PrintGCDetails && Verbose) {
1362 // Too early to use gclog_or_tty
1363 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1364 " initial_heap_size: " SIZE_FORMAT
1365 " max_heap: " SIZE_FORMAT,
1366 min_heap_size(), InitialHeapSize, max_heap);
1367 }
1368 size_t min_new = preferred_max_new_size;
1369 if (FLAG_IS_CMDLINE(NewSize)) {
1370 min_new = NewSize;
1371 }
1372 if (max_heap > min_new && min_heap_size() > min_new) {
1373 // Unless explicitly requested otherwise, make young gen
1374 // at least min_new, and at most preferred_max_new_size.
1375 if (FLAG_IS_DEFAULT(NewSize)) {
1376 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1377 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1378 if (PrintGCDetails && Verbose) {
1379 // Too early to use gclog_or_tty
1380 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1381 }
1382 }
1383 // Unless explicitly requested otherwise, size old gen
1384 // so it's NewRatio x of NewSize.
1385 if (FLAG_IS_DEFAULT(OldSize)) {
1386 if (max_heap > NewSize) {
1387 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1388 if (PrintGCDetails && Verbose) {
1389 // Too early to use gclog_or_tty
1390 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1391 }
1392 }
1393 }
1394 }
1395 }
1396 // Unless explicitly requested otherwise, definitely
1397 // promote all objects surviving "tenuring_default" scavenges.
1398 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1399 FLAG_IS_DEFAULT(SurvivorRatio)) {
1400 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1401 }
1402 // If we decided above (or user explicitly requested)
1403 // `promote all' (via MaxTenuringThreshold := 0),
1404 // prefer minuscule survivor spaces so as not to waste
1405 // space for (non-existent) survivors
1406 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1407 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1408 }
1409 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1410 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1411 // This is done in order to make ParNew+CMS configuration to work
1412 // with YoungPLABSize and OldPLABSize options.
1413 // See CR 6362902.
1414 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1415 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1416 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1417 // is. In this situation let CMSParPromoteBlocksToClaim follow
1418 // the value (either from the command line or ergonomics) of
1419 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1420 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1421 } else {
1422 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1423 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1424 // we'll let it to take precedence.
1425 jio_fprintf(defaultStream::error_stream(),
1426 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1427 " options are specified for the CMS collector."
1428 " CMSParPromoteBlocksToClaim will take precedence.\n");
1429 }
1430 }
1431 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1432 // OldPLAB sizing manually turned off: Use a larger default setting,
1433 // unless it was manually specified. This is because a too-low value
1434 // will slow down scavenges.
1435 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1436 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1437 }
1438 }
1439 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1440 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1441 // If either of the static initialization defaults have changed, note this
1442 // modification.
1443 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1444 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1445 }
1446 if (PrintGCDetails && Verbose) {
1447 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1448 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1449 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1450 }
1451 }
1452 #endif // INCLUDE_ALL_GCS
1453
1454 void set_object_alignment() {
1455 // Object alignment.
1456 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1457 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1458 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1459 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1460 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1461 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1462
1463 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1464 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1465
1466 // Oop encoding heap max
1467 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1468
1469 #if INCLUDE_ALL_GCS
1470 // Set CMS global values
1471 CompactibleFreeListSpace::set_cms_values();
1472 #endif // INCLUDE_ALL_GCS
1473 }
1474
1475 bool verify_object_alignment() {
1476 // Object alignment.
1477 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1478 jio_fprintf(defaultStream::error_stream(),
1479 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1480 (int)ObjectAlignmentInBytes);
1481 return false;
1482 }
1483 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1484 jio_fprintf(defaultStream::error_stream(),
1485 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1486 (int)ObjectAlignmentInBytes, BytesPerLong);
1487 return false;
1488 }
1489 // It does not make sense to have big object alignment
1490 // since a space lost due to alignment will be greater
1491 // then a saved space from compressed oops.
1492 if ((int)ObjectAlignmentInBytes > 256) {
1493 jio_fprintf(defaultStream::error_stream(),
1494 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1495 (int)ObjectAlignmentInBytes);
1496 return false;
1497 }
1498 // In case page size is very small.
1499 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1500 jio_fprintf(defaultStream::error_stream(),
1501 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1502 (int)ObjectAlignmentInBytes, os::vm_page_size());
1503 return false;
1504 }
1505 if(SurvivorAlignmentInBytes == 0) {
1506 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1507 } else {
1508 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1509 jio_fprintf(defaultStream::error_stream(),
1510 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1511 (int)SurvivorAlignmentInBytes);
1512 return false;
1513 }
1514 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1515 jio_fprintf(defaultStream::error_stream(),
1516 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1517 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1518 return false;
1519 }
1520 }
1521 return true;
1522 }
1523
1524 size_t Arguments::max_heap_for_compressed_oops() {
1525 // Avoid sign flip.
1526 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1527 // We need to fit both the NULL page and the heap into the memory budget, while
1528 // keeping alignment constraints of the heap. To guarantee the latter, as the
1529 // NULL page is located before the heap, we pad the NULL page to the conservative
1530 // maximum alignment that the GC may ever impose upon the heap.
1531 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1532 _conservative_max_heap_alignment);
1533
1534 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1535 NOT_LP64(ShouldNotReachHere(); return 0);
1536 }
1537
1538 bool Arguments::should_auto_select_low_pause_collector() {
1539 if (UseAutoGCSelectPolicy &&
1540 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1541 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1542 if (PrintGCDetails) {
1543 // Cannot use gclog_or_tty yet.
1544 tty->print_cr("Automatic selection of the low pause collector"
1545 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1546 }
1547 return true;
1548 }
1549 return false;
1550 }
1551
1552 void Arguments::set_use_compressed_oops() {
1553 #ifndef ZERO
1554 #ifdef _LP64
1555 // MaxHeapSize is not set up properly at this point, but
1556 // the only value that can override MaxHeapSize if we are
1557 // to use UseCompressedOops is InitialHeapSize.
1558 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1559
1560 if (max_heap_size <= max_heap_for_compressed_oops()) {
1561 #if !defined(COMPILER1) || defined(TIERED)
1562 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1563 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1564 }
1565 #endif
1566 #ifdef _WIN64
1567 if (UseLargePages && UseCompressedOops) {
1568 // Cannot allocate guard pages for implicit checks in indexed addressing
1569 // mode, when large pages are specified on windows.
1570 // This flag could be switched ON if narrow oop base address is set to 0,
1571 // see code in Universe::initialize_heap().
1572 Universe::set_narrow_oop_use_implicit_null_checks(false);
1573 }
1574 #endif // _WIN64
1575 } else {
1576 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1577 warning("Max heap size too large for Compressed Oops");
1578 FLAG_SET_DEFAULT(UseCompressedOops, false);
1579 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1580 }
1581 }
1582 #endif // _LP64
1583 #endif // ZERO
1584 }
1585
1586
1587 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1588 // set_use_compressed_oops().
1589 void Arguments::set_use_compressed_klass_ptrs() {
1590 #ifndef ZERO
1591 #ifdef _LP64
1592 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1593 if (!UseCompressedOops) {
1594 if (UseCompressedClassPointers) {
1595 warning("UseCompressedClassPointers requires UseCompressedOops");
1596 }
1597 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1598 } else {
1599 // Turn on UseCompressedClassPointers too
1600 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1601 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1602 }
1603 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1604 if (UseCompressedClassPointers) {
1605 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1606 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1607 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1608 }
1609 }
1610 }
1611 #endif // _LP64
1612 #endif // !ZERO
1613 }
1614
1615 void Arguments::set_conservative_max_heap_alignment() {
1616 // The conservative maximum required alignment for the heap is the maximum of
1617 // the alignments imposed by several sources: any requirements from the heap
1618 // itself, the collector policy and the maximum page size we may run the VM
1619 // with.
1620 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1621 #if INCLUDE_ALL_GCS
1622 if (UseParallelGC) {
1623 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1624 } else if (UseG1GC) {
1625 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1626 }
1627 #endif // INCLUDE_ALL_GCS
1628 _conservative_max_heap_alignment = MAX4(heap_alignment,
1629 (size_t)os::vm_allocation_granularity(),
1630 os::max_page_size(),
1631 CollectorPolicy::compute_heap_alignment());
1632 }
1633
1634 void Arguments::select_gc_ergonomically() {
1635 if (os::is_server_class_machine()) {
1636 if (should_auto_select_low_pause_collector()) {
1637 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1638 } else {
1639 FLAG_SET_ERGO(bool, UseParallelGC, true);
1640 }
1641 }
1642 }
1643
1644 void Arguments::select_gc() {
1645 if (!gc_selected()) {
1646 ArgumentsExt::select_gc_ergonomically();
1647 }
1648 }
1649
1650 void Arguments::set_ergonomics_flags() {
1651 select_gc();
1652
1653 #ifdef COMPILER2
1654 // Shared spaces work fine with other GCs but causes bytecode rewriting
1655 // to be disabled, which hurts interpreter performance and decreases
1656 // server performance. When -server is specified, keep the default off
1657 // unless it is asked for. Future work: either add bytecode rewriting
1658 // at link time, or rewrite bytecodes in non-shared methods.
1659 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1660 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1661 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1662 }
1663 #endif
1664
1665 set_conservative_max_heap_alignment();
1666
1667 #ifndef ZERO
1668 #ifdef _LP64
1669 set_use_compressed_oops();
1670
1671 // set_use_compressed_klass_ptrs() must be called after calling
1672 // set_use_compressed_oops().
1673 set_use_compressed_klass_ptrs();
1674
1675 // Also checks that certain machines are slower with compressed oops
1676 // in vm_version initialization code.
1677 #endif // _LP64
1678 #endif // !ZERO
1679 }
1680
1681 void Arguments::set_parallel_gc_flags() {
1682 assert(UseParallelGC || UseParallelOldGC, "Error");
1683 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1684 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1685 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1686 }
1687 FLAG_SET_DEFAULT(UseParallelGC, true);
1688
1689 // If no heap maximum was requested explicitly, use some reasonable fraction
1690 // of the physical memory, up to a maximum of 1GB.
1691 FLAG_SET_DEFAULT(ParallelGCThreads,
1692 Abstract_VM_Version::parallel_worker_threads());
1693 if (ParallelGCThreads == 0) {
1694 jio_fprintf(defaultStream::error_stream(),
1695 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1696 vm_exit(1);
1697 }
1698
1699 if (UseAdaptiveSizePolicy) {
1700 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1701 // unless the user actually sets these flags.
1702 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1703 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1704 _min_heap_free_ratio = MinHeapFreeRatio;
1705 }
1706 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1707 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1708 _max_heap_free_ratio = MaxHeapFreeRatio;
1709 }
1710 }
1711
1712 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1713 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1714 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1715 // See CR 6362902 for details.
1716 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1717 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1718 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1719 }
1720 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1721 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1722 }
1723 }
1724
1725 if (UseParallelOldGC) {
1726 // Par compact uses lower default values since they are treated as
1727 // minimums. These are different defaults because of the different
1728 // interpretation and are not ergonomically set.
1729 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1730 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1731 }
1732 }
1733 }
1734
1735 void Arguments::set_g1_gc_flags() {
1736 assert(UseG1GC, "Error");
1737 #ifdef COMPILER1
1738 FastTLABRefill = false;
1739 #endif
1740 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1741 if (ParallelGCThreads == 0) {
1742 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1743 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1744 }
1745
1746 #if INCLUDE_ALL_GCS
1747 if (G1ConcRefinementThreads == 0) {
1748 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1749 }
1750 #endif
1751
1752 // MarkStackSize will be set (if it hasn't been set by the user)
1753 // when concurrent marking is initialized.
1754 // Its value will be based upon the number of parallel marking threads.
1755 // But we do set the maximum mark stack size here.
1756 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1757 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1758 }
1759
1760 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1761 // In G1, we want the default GC overhead goal to be higher than
1762 // say in PS. So we set it here to 10%. Otherwise the heap might
1763 // be expanded more aggressively than we would like it to. In
1764 // fact, even 10% seems to not be high enough in some cases
1765 // (especially small GC stress tests that the main thing they do
1766 // is allocation). We might consider increase it further.
1767 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1768 }
1769
1770 if (PrintGCDetails && Verbose) {
1771 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1772 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1773 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1774 }
1775 }
1776
1777 #if !INCLUDE_ALL_GCS
1778 #ifdef ASSERT
1779 static bool verify_serial_gc_flags() {
1780 return (UseSerialGC &&
1781 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1782 UseParallelGC || UseParallelOldGC));
1783 }
1784 #endif // ASSERT
1785 #endif // INCLUDE_ALL_GCS
1786
1787 void Arguments::set_gc_specific_flags() {
1788 #if INCLUDE_ALL_GCS
1789 // Set per-collector flags
1790 if (UseParallelGC || UseParallelOldGC) {
1791 set_parallel_gc_flags();
1792 } else if (UseConcMarkSweepGC) {
1793 set_cms_and_parnew_gc_flags();
1794 } else if (UseG1GC) {
1795 set_g1_gc_flags();
1796 }
1797 check_deprecated_gc_flags();
1798 if (AssumeMP && !UseSerialGC) {
1799 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1800 warning("If the number of processors is expected to increase from one, then"
1801 " you should configure the number of parallel GC threads appropriately"
1802 " using -XX:ParallelGCThreads=N");
1803 }
1804 }
1805 if (MinHeapFreeRatio == 100) {
1806 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1807 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1808 }
1809 #else // INCLUDE_ALL_GCS
1810 assert(verify_serial_gc_flags(), "SerialGC unset");
1811 #endif // INCLUDE_ALL_GCS
1812 }
1813
1814 julong Arguments::limit_by_allocatable_memory(julong limit) {
1815 julong max_allocatable;
1816 julong result = limit;
1817 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1818 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1819 }
1820 return result;
1821 }
1822
1823 // Use static initialization to get the default before parsing
1824 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1825
1826 void Arguments::set_heap_size() {
1827 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1828 // Deprecated flag
1829 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1830 }
1831
1832 const julong phys_mem =
1833 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1834 : (julong)MaxRAM;
1835
1836 // If the maximum heap size has not been set with -Xmx,
1837 // then set it as fraction of the size of physical memory,
1838 // respecting the maximum and minimum sizes of the heap.
1839 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1840 julong reasonable_max = phys_mem / MaxRAMFraction;
1841
1842 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1843 // Small physical memory, so use a minimum fraction of it for the heap
1844 reasonable_max = phys_mem / MinRAMFraction;
1845 } else {
1846 // Not-small physical memory, so require a heap at least
1847 // as large as MaxHeapSize
1848 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1849 }
1850 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1851 // Limit the heap size to ErgoHeapSizeLimit
1852 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1853 }
1854 if (UseCompressedOops) {
1855 // Limit the heap size to the maximum possible when using compressed oops
1856 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1857
1858 // HeapBaseMinAddress can be greater than default but not less than.
1859 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1860 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1861 // matches compressed oops printing flags
1862 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1863 jio_fprintf(defaultStream::error_stream(),
1864 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1865 " (" UINTX_FORMAT "G) which is greater than value given "
1866 UINTX_FORMAT "\n",
1867 DefaultHeapBaseMinAddress,
1868 DefaultHeapBaseMinAddress/G,
1869 HeapBaseMinAddress);
1870 }
1871 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1872 }
1873 }
1874
1875 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1876 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1877 // but it should be not less than default MaxHeapSize.
1878 max_coop_heap -= HeapBaseMinAddress;
1879 }
1880 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1881 }
1882 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1883
1884 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1885 // An initial heap size was specified on the command line,
1886 // so be sure that the maximum size is consistent. Done
1887 // after call to limit_by_allocatable_memory because that
1888 // method might reduce the allocation size.
1889 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1890 }
1891
1892 if (PrintGCDetails && Verbose) {
1893 // Cannot use gclog_or_tty yet.
1894 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1895 }
1896 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1897 }
1898
1899 // If the minimum or initial heap_size have not been set or requested to be set
1900 // ergonomically, set them accordingly.
1901 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1902 julong reasonable_minimum = (julong)(OldSize + NewSize);
1903
1904 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1905
1906 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1907
1908 if (InitialHeapSize == 0) {
1909 julong reasonable_initial = phys_mem / InitialRAMFraction;
1910
1911 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1912 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1913
1914 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1915
1916 if (PrintGCDetails && Verbose) {
1917 // Cannot use gclog_or_tty yet.
1918 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1919 }
1920 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1921 }
1922 // If the minimum heap size has not been set (via -Xms),
1923 // synchronize with InitialHeapSize to avoid errors with the default value.
1924 if (min_heap_size() == 0) {
1925 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1926 if (PrintGCDetails && Verbose) {
1927 // Cannot use gclog_or_tty yet.
1928 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1929 }
1930 }
1931 }
1932 }
1933
1934 // This must be called after ergonomics because we want bytecode rewriting
1935 // if the server compiler is used, or if UseSharedSpaces is disabled.
1936 void Arguments::set_bytecode_flags() {
1937 // Better not attempt to store into a read-only space.
1938 if (UseSharedSpaces) {
1939 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1940 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1941 }
1942
1943 if (!RewriteBytecodes) {
1944 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1945 }
1946 }
1947
1948 // Aggressive optimization flags -XX:+AggressiveOpts
1949 void Arguments::set_aggressive_opts_flags() {
1950 #ifdef COMPILER2
1951 if (AggressiveUnboxing) {
1952 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1953 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1954 } else if (!EliminateAutoBox) {
1955 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1956 AggressiveUnboxing = false;
1957 }
1958 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1959 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1960 } else if (!DoEscapeAnalysis) {
1961 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1962 AggressiveUnboxing = false;
1963 }
1964 }
1965 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1966 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1967 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1968 }
1969 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1970 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1971 }
1972
1973 // Feed the cache size setting into the JDK
1974 char buffer[1024];
1975 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1976 add_property(buffer);
1977 }
1978 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1979 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1980 }
1981 #endif
1982
1983 if (AggressiveOpts) {
1984 // Sample flag setting code
1985 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1986 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1987 // }
1988 }
1989 }
1990
1991 //===========================================================================================================
1992 // Parsing of java.compiler property
1993
1994 void Arguments::process_java_compiler_argument(char* arg) {
1995 // For backwards compatibility, Djava.compiler=NONE or ""
1996 // causes us to switch to -Xint mode UNLESS -Xdebug
1997 // is also specified.
1998 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1999 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2000 }
2001 }
2002
2003 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2004 _sun_java_launcher = os::strdup_check_oom(launcher);
2005 }
2006
2007 bool Arguments::created_by_java_launcher() {
2008 assert(_sun_java_launcher != NULL, "property must have value");
2009 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2010 }
2011
2012 bool Arguments::sun_java_launcher_is_altjvm() {
2013 return _sun_java_launcher_is_altjvm;
2014 }
2015
2016 //===========================================================================================================
2017 // Parsing of main arguments
2018
2019 bool Arguments::verify_interval(uintx val, uintx min,
2020 uintx max, const char* name) {
2021 // Returns true iff value is in the inclusive interval [min..max]
2022 // false, otherwise.
2023 if (val >= min && val <= max) {
2024 return true;
2025 }
2026 jio_fprintf(defaultStream::error_stream(),
2027 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2028 " and " UINTX_FORMAT "\n",
2029 name, val, min, max);
2030 return false;
2031 }
2032
2033 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2034 // Returns true if given value is at least specified min threshold
2035 // false, otherwise.
2036 if (val >= min ) {
2037 return true;
2038 }
2039 jio_fprintf(defaultStream::error_stream(),
2040 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2041 name, val, min);
2042 return false;
2043 }
2044
2045 bool Arguments::verify_percentage(uintx value, const char* name) {
2046 if (is_percentage(value)) {
2047 return true;
2048 }
2049 jio_fprintf(defaultStream::error_stream(),
2050 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2051 name, value);
2052 return false;
2053 }
2054
2055 // check if do gclog rotation
2056 // +UseGCLogFileRotation is a must,
2057 // no gc log rotation when log file not supplied or
2058 // NumberOfGCLogFiles is 0
2059 void check_gclog_consistency() {
2060 if (UseGCLogFileRotation) {
2061 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2062 jio_fprintf(defaultStream::output_stream(),
2063 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2064 "where num_of_file > 0\n"
2065 "GC log rotation is turned off\n");
2066 UseGCLogFileRotation = false;
2067 }
2068 }
2069
2070 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2071 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2072 jio_fprintf(defaultStream::output_stream(),
2073 "GCLogFileSize changed to minimum 8K\n");
2074 }
2075 }
2076
2077 // This function is called for -Xloggc:<filename>, it can be used
2078 // to check if a given file name(or string) conforms to the following
2079 // specification:
2080 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2081 // %p and %t only allowed once. We only limit usage of filename not path
2082 bool is_filename_valid(const char *file_name) {
2083 const char* p = file_name;
2084 char file_sep = os::file_separator()[0];
2085 const char* cp;
2086 // skip prefix path
2087 for (cp = file_name; *cp != '\0'; cp++) {
2088 if (*cp == '/' || *cp == file_sep) {
2089 p = cp + 1;
2090 }
2091 }
2092
2093 int count_p = 0;
2094 int count_t = 0;
2095 while (*p != '\0') {
2096 if ((*p >= '0' && *p <= '9') ||
2097 (*p >= 'A' && *p <= 'Z') ||
2098 (*p >= 'a' && *p <= 'z') ||
2099 *p == '-' ||
2100 *p == '_' ||
2101 *p == '.') {
2102 p++;
2103 continue;
2104 }
2105 if (*p == '%') {
2106 if(*(p + 1) == 'p') {
2107 p += 2;
2108 count_p ++;
2109 continue;
2110 }
2111 if (*(p + 1) == 't') {
2112 p += 2;
2113 count_t ++;
2114 continue;
2115 }
2116 }
2117 return false;
2118 }
2119 return count_p < 2 && count_t < 2;
2120 }
2121
2122 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2123 if (!is_percentage(min_heap_free_ratio)) {
2124 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2125 return false;
2126 }
2127 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2128 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2129 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2130 MaxHeapFreeRatio);
2131 return false;
2132 }
2133 // This does not set the flag itself, but stores the value in a safe place for later usage.
2134 _min_heap_free_ratio = min_heap_free_ratio;
2135 return true;
2136 }
2137
2138 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2139 if (!is_percentage(max_heap_free_ratio)) {
2140 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2141 return false;
2142 }
2143 if (max_heap_free_ratio < MinHeapFreeRatio) {
2144 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2145 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2146 MinHeapFreeRatio);
2147 return false;
2148 }
2149 // This does not set the flag itself, but stores the value in a safe place for later usage.
2150 _max_heap_free_ratio = max_heap_free_ratio;
2151 return true;
2152 }
2153
2154 // Check consistency of GC selection
2155 bool Arguments::check_gc_consistency_user() {
2156 check_gclog_consistency();
2157 // Ensure that the user has not selected conflicting sets
2158 // of collectors.
2159 uint i = 0;
2160 if (UseSerialGC) i++;
2161 if (UseConcMarkSweepGC) i++;
2162 if (UseParallelGC || UseParallelOldGC) i++;
2163 if (UseG1GC) i++;
2164 if (i > 1) {
2165 jio_fprintf(defaultStream::error_stream(),
2166 "Conflicting collector combinations in option list; "
2167 "please refer to the release notes for the combinations "
2168 "allowed\n");
2169 return false;
2170 }
2171
2172 if (UseConcMarkSweepGC && !UseParNewGC) {
2173 jio_fprintf(defaultStream::error_stream(),
2174 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2175 return false;
2176 }
2177
2178 if (UseParNewGC && !UseConcMarkSweepGC) {
2179 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2180 // set up UseSerialGC properly, so that can't be used in the check here.
2181 jio_fprintf(defaultStream::error_stream(),
2182 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2183 return false;
2184 }
2185
2186 return true;
2187 }
2188
2189 void Arguments::check_deprecated_gc_flags() {
2190 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2191 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2192 }
2193 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2194 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2195 "and will likely be removed in future release");
2196 }
2197 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2198 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2199 "Use MaxRAMFraction instead.");
2200 }
2201 }
2202
2203 // Check stack pages settings
2204 bool Arguments::check_stack_pages()
2205 {
2206 bool status = true;
2207 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2208 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2209 // greater stack shadow pages can't generate instruction to bang stack
2210 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2211 return status;
2212 }
2213
2214 // Check the consistency of vm_init_args
2215 bool Arguments::check_vm_args_consistency() {
2216 // Method for adding checks for flag consistency.
2217 // The intent is to warn the user of all possible conflicts,
2218 // before returning an error.
2219 // Note: Needs platform-dependent factoring.
2220 bool status = true;
2221
2222 if (TLABRefillWasteFraction == 0) {
2223 jio_fprintf(defaultStream::error_stream(),
2224 "TLABRefillWasteFraction should be a denominator, "
2225 "not " SIZE_FORMAT "\n",
2226 TLABRefillWasteFraction);
2227 status = false;
2228 }
2229
2230 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2231 "AdaptiveSizePolicyWeight");
2232 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2233
2234 // Divide by bucket size to prevent a large size from causing rollover when
2235 // calculating amount of memory needed to be allocated for the String table.
2236 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2237 (max_uintx / StringTable::bucket_size()), "StringTable size");
2238
2239 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2240 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2241
2242 {
2243 // Using "else if" below to avoid printing two error messages if min > max.
2244 // This will also prevent us from reporting both min>100 and max>100 at the
2245 // same time, but that is less annoying than printing two identical errors IMHO.
2246 FormatBuffer<80> err_msg("%s","");
2247 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2248 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2249 status = false;
2250 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2251 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2252 status = false;
2253 }
2254 }
2255
2256 // Min/MaxMetaspaceFreeRatio
2257 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2258 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2259
2260 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2261 jio_fprintf(defaultStream::error_stream(),
2262 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2263 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2264 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2265 MinMetaspaceFreeRatio,
2266 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2267 MaxMetaspaceFreeRatio);
2268 status = false;
2269 }
2270
2271 // Trying to keep 100% free is not practical
2272 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2273
2274 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2275 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2276 }
2277
2278 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2279 // Settings to encourage splitting.
2280 if (!FLAG_IS_CMDLINE(NewRatio)) {
2281 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2282 }
2283 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2284 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2285 }
2286 }
2287
2288 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2289 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2290 }
2291
2292 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2293 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2294 if (GCTimeLimit == 100) {
2295 // Turn off gc-overhead-limit-exceeded checks
2296 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2297 }
2298
2299 status = status && check_gc_consistency_user();
2300 status = status && check_stack_pages();
2301
2302 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2303 "CMSIncrementalSafetyFactor");
2304
2305 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2306 // insists that we hold the requisite locks so that the iteration is
2307 // MT-safe. For the verification at start-up and shut-down, we don't
2308 // yet have a good way of acquiring and releasing these locks,
2309 // which are not visible at the CollectedHeap level. We want to
2310 // be able to acquire these locks and then do the iteration rather
2311 // than just disable the lock verification. This will be fixed under
2312 // bug 4788986.
2313 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2314 if (VerifyDuringStartup) {
2315 warning("Heap verification at start-up disabled "
2316 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2317 VerifyDuringStartup = false; // Disable verification at start-up
2318 }
2319
2320 if (VerifyBeforeExit) {
2321 warning("Heap verification at shutdown disabled "
2322 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2323 VerifyBeforeExit = false; // Disable verification at shutdown
2324 }
2325 }
2326
2327 // Note: only executed in non-PRODUCT mode
2328 if (!UseAsyncConcMarkSweepGC &&
2329 (ExplicitGCInvokesConcurrent ||
2330 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2333 " with -UseAsyncConcMarkSweepGC");
2334 status = false;
2335 }
2336
2337 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2338
2339 #if INCLUDE_ALL_GCS
2340 if (UseG1GC) {
2341 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2342 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2343 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2344
2345 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2346 "InitiatingHeapOccupancyPercent");
2347 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2348 "G1RefProcDrainInterval");
2349 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2350 "G1ConcMarkStepDurationMillis");
2351 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2352 "G1ConcRSHotCardLimit");
2353 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2354 "G1ConcRSLogCacheSize");
2355 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2356 "StringDeduplicationAgeThreshold");
2357 }
2358 if (UseConcMarkSweepGC) {
2359 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2360 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2361 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2362 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2363
2364 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2365
2366 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2367 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2368 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2369
2370 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2371
2372 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2373 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2374
2375 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2376 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2377 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2378
2379 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2380
2381 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2382
2383 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2384 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2385 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2386 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2387 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2388 }
2389
2390 if (UseParallelGC || UseParallelOldGC) {
2391 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2392 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2393
2394 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2395 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2396
2397 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2398 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2399
2400 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2401
2402 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2403 }
2404 #endif // INCLUDE_ALL_GCS
2405
2406 status = status && verify_interval(RefDiscoveryPolicy,
2407 ReferenceProcessor::DiscoveryPolicyMin,
2408 ReferenceProcessor::DiscoveryPolicyMax,
2409 "RefDiscoveryPolicy");
2410
2411 // Limit the lower bound of this flag to 1 as it is used in a division
2412 // expression.
2413 status = status && verify_interval(TLABWasteTargetPercent,
2414 1, 100, "TLABWasteTargetPercent");
2415
2416 status = status && verify_object_alignment();
2417
2418 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2419 "CompressedClassSpaceSize");
2420
2421 status = status && verify_interval(MarkStackSizeMax,
2422 1, (max_jint - 1), "MarkStackSizeMax");
2423 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2424
2425 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2426
2427 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2428
2429 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2430
2431 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2432 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2433
2434 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2435
2436 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2437 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2438 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2439 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2440
2441 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2442 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2443
2444 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2445 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2446 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2447
2448 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2449 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2450
2451 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2452 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2453 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2454 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2455
2456 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2457 #ifdef COMPILER1
2458 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2459 #endif
2460
2461 if (PrintNMTStatistics) {
2462 #if INCLUDE_NMT
2463 if (MemTracker::tracking_level() == NMT_off) {
2464 #endif // INCLUDE_NMT
2465 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2466 PrintNMTStatistics = false;
2467 #if INCLUDE_NMT
2468 }
2469 #endif
2470 }
2471
2472 // Need to limit the extent of the padding to reasonable size.
2473 // 8K is well beyond the reasonable HW cache line size, even with the
2474 // aggressive prefetching, while still leaving the room for segregating
2475 // among the distinct pages.
2476 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2479 ContendedPaddingWidth, 0, 8192);
2480 status = false;
2481 }
2482
2483 // Need to enforce the padding not to break the existing field alignments.
2484 // It is sufficient to check against the largest type size.
2485 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2488 ContendedPaddingWidth, BytesPerLong);
2489 status = false;
2490 }
2491
2492 // Check lower bounds of the code cache
2493 // Template Interpreter code is approximately 3X larger in debug builds.
2494 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2495 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2496 jio_fprintf(defaultStream::error_stream(),
2497 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2498 os::vm_page_size()/K);
2499 status = false;
2500 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2501 jio_fprintf(defaultStream::error_stream(),
2502 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2503 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2504 status = false;
2505 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2508 min_code_cache_size/K);
2509 status = false;
2510 } else if (ReservedCodeCacheSize > 2*G) {
2511 // Code cache size larger than MAXINT is not supported.
2512 jio_fprintf(defaultStream::error_stream(),
2513 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2514 (2*G)/M);
2515 status = false;
2516 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2517 jio_fprintf(defaultStream::error_stream(),
2518 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2519 min_code_cache_size/K);
2520 status = false;
2521 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2522 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2523 jio_fprintf(defaultStream::error_stream(),
2524 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2525 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2526 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2527 status = false;
2528 }
2529
2530 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2531 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2532 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2533 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2534
2535
2536 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2537 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2538 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2539 // Check the minimum number of compiler threads
2540 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2541
2542 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2543 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2544 }
2545
2546 return status;
2547 }
2548
2549 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2550 const char* option_type) {
2551 if (ignore) return false;
2552
2553 const char* spacer = " ";
2554 if (option_type == NULL) {
2555 option_type = ++spacer; // Set both to the empty string.
2556 }
2557
2558 if (os::obsolete_option(option)) {
2559 jio_fprintf(defaultStream::error_stream(),
2560 "Obsolete %s%soption: %s\n", option_type, spacer,
2561 option->optionString);
2562 return false;
2563 } else {
2564 jio_fprintf(defaultStream::error_stream(),
2565 "Unrecognized %s%soption: %s\n", option_type, spacer,
2566 option->optionString);
2567 return true;
2568 }
2569 }
2570
2571 static const char* user_assertion_options[] = {
2572 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2573 };
2574
2575 static const char* system_assertion_options[] = {
2576 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2577 };
2578
2579 // Return true if any of the strings in null-terminated array 'names' matches.
2580 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2581 // the option must match exactly.
2582 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2583 bool tail_allowed) {
2584 for (/* empty */; *names != NULL; ++names) {
2585 if (match_option(option, *names, tail)) {
2586 if (**tail == '\0' || tail_allowed && **tail == ':') {
2587 return true;
2588 }
2589 }
2590 }
2591 return false;
2592 }
2593
2594 bool Arguments::parse_uintx(const char* value,
2595 uintx* uintx_arg,
2596 uintx min_size) {
2597
2598 // Check the sign first since atomull() parses only unsigned values.
2599 bool value_is_positive = !(*value == '-');
2600
2601 if (value_is_positive) {
2602 julong n;
2603 bool good_return = atomull(value, &n);
2604 if (good_return) {
2605 bool above_minimum = n >= min_size;
2606 bool value_is_too_large = n > max_uintx;
2607
2608 if (above_minimum && !value_is_too_large) {
2609 *uintx_arg = n;
2610 return true;
2611 }
2612 }
2613 }
2614 return false;
2615 }
2616
2617 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2618 julong* long_arg,
2619 julong min_size) {
2620 if (!atomull(s, long_arg)) return arg_unreadable;
2621 return check_memory_size(*long_arg, min_size);
2622 }
2623
2624 // Parse JavaVMInitArgs structure
2625
2626 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2627 // For components of the system classpath.
2628 SysClassPath scp(Arguments::get_sysclasspath());
2629 bool scp_assembly_required = false;
2630
2631 // Save default settings for some mode flags
2632 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2633 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2634 Arguments::_ClipInlining = ClipInlining;
2635 Arguments::_BackgroundCompilation = BackgroundCompilation;
2636
2637 // Setup flags for mixed which is the default
2638 set_mode_flags(_mixed);
2639
2640 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2641 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2642 if (result != JNI_OK) {
2643 return result;
2644 }
2645
2646 // Parse JavaVMInitArgs structure passed in
2647 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2648 if (result != JNI_OK) {
2649 return result;
2650 }
2651
2652 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2653 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2654 if (result != JNI_OK) {
2655 return result;
2656 }
2657
2658 // Do final processing now that all arguments have been parsed
2659 result = finalize_vm_init_args(&scp, scp_assembly_required);
2660 if (result != JNI_OK) {
2661 return result;
2662 }
2663
2664 return JNI_OK;
2665 }
2666
2667 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2668 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2669 // are dealing with -agentpath (case where name is a path), otherwise with
2670 // -agentlib
2671 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2672 char *_name;
2673 const char *_hprof = "hprof", *_jdwp = "jdwp";
2674 size_t _len_hprof, _len_jdwp, _len_prefix;
2675
2676 if (is_path) {
2677 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2678 return false;
2679 }
2680
2681 _name++; // skip past last path separator
2682 _len_prefix = strlen(JNI_LIB_PREFIX);
2683
2684 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2685 return false;
2686 }
2687
2688 _name += _len_prefix;
2689 _len_hprof = strlen(_hprof);
2690 _len_jdwp = strlen(_jdwp);
2691
2692 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2693 _name += _len_hprof;
2694 }
2695 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2696 _name += _len_jdwp;
2697 }
2698 else {
2699 return false;
2700 }
2701
2702 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2703 return false;
2704 }
2705
2706 return true;
2707 }
2708
2709 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2710 return true;
2711 }
2712
2713 return false;
2714 }
2715
2716 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2717 SysClassPath* scp_p,
2718 bool* scp_assembly_required_p,
2719 Flag::Flags origin) {
2720 // Remaining part of option string
2721 const char* tail;
2722
2723 // iterate over arguments
2724 for (int index = 0; index < args->nOptions; index++) {
2725 bool is_absolute_path = false; // for -agentpath vs -agentlib
2726
2727 const JavaVMOption* option = args->options + index;
2728
2729 if (!match_option(option, "-Djava.class.path", &tail) &&
2730 !match_option(option, "-Dsun.java.command", &tail) &&
2731 !match_option(option, "-Dsun.java.launcher", &tail)) {
2732
2733 // add all jvm options to the jvm_args string. This string
2734 // is used later to set the java.vm.args PerfData string constant.
2735 // the -Djava.class.path and the -Dsun.java.command options are
2736 // omitted from jvm_args string as each have their own PerfData
2737 // string constant object.
2738 build_jvm_args(option->optionString);
2739 }
2740
2741 // -verbose:[class/gc/jni]
2742 if (match_option(option, "-verbose", &tail)) {
2743 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2744 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2745 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2746 } else if (!strcmp(tail, ":gc")) {
2747 FLAG_SET_CMDLINE(bool, PrintGC, true);
2748 } else if (!strcmp(tail, ":jni")) {
2749 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2750 }
2751 // -da / -ea / -disableassertions / -enableassertions
2752 // These accept an optional class/package name separated by a colon, e.g.,
2753 // -da:java.lang.Thread.
2754 } else if (match_option(option, user_assertion_options, &tail, true)) {
2755 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2756 if (*tail == '\0') {
2757 JavaAssertions::setUserClassDefault(enable);
2758 } else {
2759 assert(*tail == ':', "bogus match by match_option()");
2760 JavaAssertions::addOption(tail + 1, enable);
2761 }
2762 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2763 } else if (match_option(option, system_assertion_options, &tail, false)) {
2764 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2765 JavaAssertions::setSystemClassDefault(enable);
2766 // -bootclasspath:
2767 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2768 scp_p->reset_path(tail);
2769 *scp_assembly_required_p = true;
2770 // -bootclasspath/a:
2771 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2772 scp_p->add_suffix(tail);
2773 *scp_assembly_required_p = true;
2774 // -bootclasspath/p:
2775 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2776 scp_p->add_prefix(tail);
2777 *scp_assembly_required_p = true;
2778 // -Xrun
2779 } else if (match_option(option, "-Xrun", &tail)) {
2780 if (tail != NULL) {
2781 const char* pos = strchr(tail, ':');
2782 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2783 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2784 name[len] = '\0';
2785
2786 char *options = NULL;
2787 if(pos != NULL) {
2788 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2789 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2790 }
2791 #if !INCLUDE_JVMTI
2792 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2793 jio_fprintf(defaultStream::error_stream(),
2794 "Profiling and debugging agents are not supported in this VM\n");
2795 return JNI_ERR;
2796 }
2797 #endif // !INCLUDE_JVMTI
2798 add_init_library(name, options);
2799 }
2800 // -agentlib and -agentpath
2801 } else if (match_option(option, "-agentlib:", &tail) ||
2802 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2803 if(tail != NULL) {
2804 const char* pos = strchr(tail, '=');
2805 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2806 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2807 name[len] = '\0';
2808
2809 char *options = NULL;
2810 if(pos != NULL) {
2811 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2812 }
2813 #if !INCLUDE_JVMTI
2814 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2815 jio_fprintf(defaultStream::error_stream(),
2816 "Profiling and debugging agents are not supported in this VM\n");
2817 return JNI_ERR;
2818 }
2819 #endif // !INCLUDE_JVMTI
2820 add_init_agent(name, options, is_absolute_path);
2821 }
2822 // -javaagent
2823 } else if (match_option(option, "-javaagent:", &tail)) {
2824 #if !INCLUDE_JVMTI
2825 jio_fprintf(defaultStream::error_stream(),
2826 "Instrumentation agents are not supported in this VM\n");
2827 return JNI_ERR;
2828 #else
2829 if(tail != NULL) {
2830 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2831 add_init_agent("instrument", options, false);
2832 }
2833 #endif // !INCLUDE_JVMTI
2834 // -Xnoclassgc
2835 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2836 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2837 // -Xconcgc
2838 } else if (match_option(option, "-Xconcgc", &tail)) {
2839 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2840 // -Xnoconcgc
2841 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2842 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2843 // -Xbatch
2844 } else if (match_option(option, "-Xbatch", &tail)) {
2845 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2846 // -Xmn for compatibility with other JVM vendors
2847 } else if (match_option(option, "-Xmn", &tail)) {
2848 julong long_initial_young_size = 0;
2849 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2850 if (errcode != arg_in_range) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid initial young generation size: %s\n", option->optionString);
2853 describe_range_error(errcode);
2854 return JNI_EINVAL;
2855 }
2856 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2857 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2858 // -Xms
2859 } else if (match_option(option, "-Xms", &tail)) {
2860 julong long_initial_heap_size = 0;
2861 // an initial heap size of 0 means automatically determine
2862 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2863 if (errcode != arg_in_range) {
2864 jio_fprintf(defaultStream::error_stream(),
2865 "Invalid initial heap size: %s\n", option->optionString);
2866 describe_range_error(errcode);
2867 return JNI_EINVAL;
2868 }
2869 set_min_heap_size((uintx)long_initial_heap_size);
2870 // Currently the minimum size and the initial heap sizes are the same.
2871 // Can be overridden with -XX:InitialHeapSize.
2872 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2873 // -Xmx
2874 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2875 julong long_max_heap_size = 0;
2876 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2877 if (errcode != arg_in_range) {
2878 jio_fprintf(defaultStream::error_stream(),
2879 "Invalid maximum heap size: %s\n", option->optionString);
2880 describe_range_error(errcode);
2881 return JNI_EINVAL;
2882 }
2883 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2884 // Xmaxf
2885 } else if (match_option(option, "-Xmaxf", &tail)) {
2886 char* err;
2887 int maxf = (int)(strtod(tail, &err) * 100);
2888 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2889 jio_fprintf(defaultStream::error_stream(),
2890 "Bad max heap free percentage size: %s\n",
2891 option->optionString);
2892 return JNI_EINVAL;
2893 } else {
2894 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2895 }
2896 // Xminf
2897 } else if (match_option(option, "-Xminf", &tail)) {
2898 char* err;
2899 int minf = (int)(strtod(tail, &err) * 100);
2900 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Bad min heap free percentage size: %s\n",
2903 option->optionString);
2904 return JNI_EINVAL;
2905 } else {
2906 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2907 }
2908 // -Xss
2909 } else if (match_option(option, "-Xss", &tail)) {
2910 julong long_ThreadStackSize = 0;
2911 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2912 if (errcode != arg_in_range) {
2913 jio_fprintf(defaultStream::error_stream(),
2914 "Invalid thread stack size: %s\n", option->optionString);
2915 describe_range_error(errcode);
2916 return JNI_EINVAL;
2917 }
2918 // Internally track ThreadStackSize in units of 1024 bytes.
2919 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2920 round_to((int)long_ThreadStackSize, K) / K);
2921 // -Xoss
2922 } else if (match_option(option, "-Xoss", &tail)) {
2923 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2924 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2925 julong long_CodeCacheExpansionSize = 0;
2926 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2927 if (errcode != arg_in_range) {
2928 jio_fprintf(defaultStream::error_stream(),
2929 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2930 os::vm_page_size()/K);
2931 return JNI_EINVAL;
2932 }
2933 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2934 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2935 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2936 julong long_ReservedCodeCacheSize = 0;
2937
2938 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2939 if (errcode != arg_in_range) {
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Invalid maximum code cache size: %s.\n", option->optionString);
2942 return JNI_EINVAL;
2943 }
2944 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2945 // -XX:NonNMethodCodeHeapSize=
2946 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2947 julong long_NonNMethodCodeHeapSize = 0;
2948
2949 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2950 if (errcode != arg_in_range) {
2951 jio_fprintf(defaultStream::error_stream(),
2952 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2953 return JNI_EINVAL;
2954 }
2955 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2956 // -XX:ProfiledCodeHeapSize=
2957 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2958 julong long_ProfiledCodeHeapSize = 0;
2959
2960 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2961 if (errcode != arg_in_range) {
2962 jio_fprintf(defaultStream::error_stream(),
2963 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2964 return JNI_EINVAL;
2965 }
2966 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2967 // -XX:NonProfiledCodeHeapSizee=
2968 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2969 julong long_NonProfiledCodeHeapSize = 0;
2970
2971 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2972 if (errcode != arg_in_range) {
2973 jio_fprintf(defaultStream::error_stream(),
2974 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2975 return JNI_EINVAL;
2976 }
2977 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2978 //-XX:IncreaseFirstTierCompileThresholdAt=
2979 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2980 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2981 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2982 jio_fprintf(defaultStream::error_stream(),
2983 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2984 option->optionString);
2985 return JNI_EINVAL;
2986 }
2987 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2988 // -green
2989 } else if (match_option(option, "-green", &tail)) {
2990 jio_fprintf(defaultStream::error_stream(),
2991 "Green threads support not available\n");
2992 return JNI_EINVAL;
2993 // -native
2994 } else if (match_option(option, "-native", &tail)) {
2995 // HotSpot always uses native threads, ignore silently for compatibility
2996 // -Xsqnopause
2997 } else if (match_option(option, "-Xsqnopause", &tail)) {
2998 // EVM option, ignore silently for compatibility
2999 // -Xrs
3000 } else if (match_option(option, "-Xrs", &tail)) {
3001 // Classic/EVM option, new functionality
3002 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3003 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3004 // change default internal VM signals used - lower case for back compat
3005 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3006 // -Xoptimize
3007 } else if (match_option(option, "-Xoptimize", &tail)) {
3008 // EVM option, ignore silently for compatibility
3009 // -Xprof
3010 } else if (match_option(option, "-Xprof", &tail)) {
3011 #if INCLUDE_FPROF
3012 _has_profile = true;
3013 #else // INCLUDE_FPROF
3014 jio_fprintf(defaultStream::error_stream(),
3015 "Flat profiling is not supported in this VM.\n");
3016 return JNI_ERR;
3017 #endif // INCLUDE_FPROF
3018 // -Xconcurrentio
3019 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3020 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3021 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3022 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3023 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3024 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3025
3026 // -Xinternalversion
3027 } else if (match_option(option, "-Xinternalversion", &tail)) {
3028 jio_fprintf(defaultStream::output_stream(), "%s\n",
3029 VM_Version::internal_vm_info_string());
3030 vm_exit(0);
3031 #ifndef PRODUCT
3032 // -Xprintflags
3033 } else if (match_option(option, "-Xprintflags", &tail)) {
3034 CommandLineFlags::printFlags(tty, false);
3035 vm_exit(0);
3036 #endif
3037 // -D
3038 } else if (match_option(option, "-D", &tail)) {
3039 if (!add_property(tail)) {
3040 return JNI_ENOMEM;
3041 }
3042 // Out of the box management support
3043 if (match_option(option, "-Dcom.sun.management", &tail)) {
3044 #if INCLUDE_MANAGEMENT
3045 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3046 #else
3047 jio_fprintf(defaultStream::output_stream(),
3048 "-Dcom.sun.management is not supported in this VM.\n");
3049 return JNI_ERR;
3050 #endif
3051 }
3052 // -Xint
3053 } else if (match_option(option, "-Xint", &tail)) {
3054 set_mode_flags(_int);
3055 // -Xmixed
3056 } else if (match_option(option, "-Xmixed", &tail)) {
3057 set_mode_flags(_mixed);
3058 // -Xcomp
3059 } else if (match_option(option, "-Xcomp", &tail)) {
3060 // for testing the compiler; turn off all flags that inhibit compilation
3061 set_mode_flags(_comp);
3062 // -Xshare:dump
3063 } else if (match_option(option, "-Xshare:dump", &tail)) {
3064 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3065 set_mode_flags(_int); // Prevent compilation, which creates objects
3066 // -Xshare:on
3067 } else if (match_option(option, "-Xshare:on", &tail)) {
3068 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3069 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3070 // -Xshare:auto
3071 } else if (match_option(option, "-Xshare:auto", &tail)) {
3072 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3073 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3074 // -Xshare:off
3075 } else if (match_option(option, "-Xshare:off", &tail)) {
3076 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3077 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3078 // -Xverify
3079 } else if (match_option(option, "-Xverify", &tail)) {
3080 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3081 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3082 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3083 } else if (strcmp(tail, ":remote") == 0) {
3084 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3085 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3086 } else if (strcmp(tail, ":none") == 0) {
3087 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3088 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3089 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3090 return JNI_EINVAL;
3091 }
3092 // -Xdebug
3093 } else if (match_option(option, "-Xdebug", &tail)) {
3094 // note this flag has been used, then ignore
3095 set_xdebug_mode(true);
3096 // -Xnoagent
3097 } else if (match_option(option, "-Xnoagent", &tail)) {
3098 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3099 } else if (match_option(option, "-Xboundthreads", &tail)) {
3100 // Bind user level threads to kernel threads (Solaris only)
3101 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3102 } else if (match_option(option, "-Xloggc:", &tail)) {
3103 // Redirect GC output to the file. -Xloggc:<filename>
3104 // ostream_init_log(), when called will use this filename
3105 // to initialize a fileStream.
3106 _gc_log_filename = os::strdup_check_oom(tail);
3107 if (!is_filename_valid(_gc_log_filename)) {
3108 jio_fprintf(defaultStream::output_stream(),
3109 "Invalid file name for use with -Xloggc: Filename can only contain the "
3110 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3111 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3112 return JNI_EINVAL;
3113 }
3114 FLAG_SET_CMDLINE(bool, PrintGC, true);
3115 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3116
3117 // JNI hooks
3118 } else if (match_option(option, "-Xcheck", &tail)) {
3119 if (!strcmp(tail, ":jni")) {
3120 #if !INCLUDE_JNI_CHECK
3121 warning("JNI CHECKING is not supported in this VM");
3122 #else
3123 CheckJNICalls = true;
3124 #endif // INCLUDE_JNI_CHECK
3125 } else if (is_bad_option(option, args->ignoreUnrecognized,
3126 "check")) {
3127 return JNI_EINVAL;
3128 }
3129 } else if (match_option(option, "vfprintf", &tail)) {
3130 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3131 } else if (match_option(option, "exit", &tail)) {
3132 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3133 } else if (match_option(option, "abort", &tail)) {
3134 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3135 // -XX:+AggressiveHeap
3136 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3137
3138 // This option inspects the machine and attempts to set various
3139 // parameters to be optimal for long-running, memory allocation
3140 // intensive jobs. It is intended for machines with large
3141 // amounts of cpu and memory.
3142
3143 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3144 // VM, but we may not be able to represent the total physical memory
3145 // available (like having 8gb of memory on a box but using a 32bit VM).
3146 // Thus, we need to make sure we're using a julong for intermediate
3147 // calculations.
3148 julong initHeapSize;
3149 julong total_memory = os::physical_memory();
3150
3151 if (total_memory < (julong)256*M) {
3152 jio_fprintf(defaultStream::error_stream(),
3153 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3154 vm_exit(1);
3155 }
3156
3157 // The heap size is half of available memory, or (at most)
3158 // all of possible memory less 160mb (leaving room for the OS
3159 // when using ISM). This is the maximum; because adaptive sizing
3160 // is turned on below, the actual space used may be smaller.
3161
3162 initHeapSize = MIN2(total_memory / (julong)2,
3163 total_memory - (julong)160*M);
3164
3165 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3166
3167 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3168 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3169 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3170 // Currently the minimum size and the initial heap sizes are the same.
3171 set_min_heap_size(initHeapSize);
3172 }
3173 if (FLAG_IS_DEFAULT(NewSize)) {
3174 // Make the young generation 3/8ths of the total heap.
3175 FLAG_SET_CMDLINE(uintx, NewSize,
3176 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3177 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3178 }
3179
3180 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3181 FLAG_SET_DEFAULT(UseLargePages, true);
3182 #endif
3183
3184 // Increase some data structure sizes for efficiency
3185 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3186 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3187 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3188
3189 // See the OldPLABSize comment below, but replace 'after promotion'
3190 // with 'after copying'. YoungPLABSize is the size of the survivor
3191 // space per-gc-thread buffers. The default is 4kw.
3192 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3193
3194 // OldPLABSize is the size of the buffers in the old gen that
3195 // UseParallelGC uses to promote live data that doesn't fit in the
3196 // survivor spaces. At any given time, there's one for each gc thread.
3197 // The default size is 1kw. These buffers are rarely used, since the
3198 // survivor spaces are usually big enough. For specjbb, however, there
3199 // are occasions when there's lots of live data in the young gen
3200 // and we end up promoting some of it. We don't have a definite
3201 // explanation for why bumping OldPLABSize helps, but the theory
3202 // is that a bigger PLAB results in retaining something like the
3203 // original allocation order after promotion, which improves mutator
3204 // locality. A minor effect may be that larger PLABs reduce the
3205 // number of PLAB allocation events during gc. The value of 8kw
3206 // was arrived at by experimenting with specjbb.
3207 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3208
3209 // Enable parallel GC and adaptive generation sizing
3210 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3211 FLAG_SET_DEFAULT(ParallelGCThreads,
3212 Abstract_VM_Version::parallel_worker_threads());
3213
3214 // Encourage steady state memory management
3215 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3216
3217 // This appears to improve mutator locality
3218 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3219
3220 // Get around early Solaris scheduling bug
3221 // (affinity vs other jobs on system)
3222 // but disallow DR and offlining (5008695).
3223 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3224
3225 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3226 // and the last option wins.
3227 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3228 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3229 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3230 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3231 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3232 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3233 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3234 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3235 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3236 uintx max_tenuring_thresh = 0;
3237 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3238 jio_fprintf(defaultStream::error_stream(),
3239 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3240 }
3241 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3242
3243 if (MaxTenuringThreshold == 0) {
3244 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3245 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3246 } else {
3247 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3248 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3249 }
3250 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3251 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3252 jio_fprintf(defaultStream::error_stream(),
3253 "Please use CMSClassUnloadingEnabled in place of "
3254 "CMSPermGenSweepingEnabled in the future\n");
3255 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3256 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3257 jio_fprintf(defaultStream::error_stream(),
3258 "Please use -XX:+UseGCOverheadLimit in place of "
3259 "-XX:+UseGCTimeLimit in the future\n");
3260 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3261 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3262 jio_fprintf(defaultStream::error_stream(),
3263 "Please use -XX:-UseGCOverheadLimit in place of "
3264 "-XX:-UseGCTimeLimit in the future\n");
3265 // The TLE options are for compatibility with 1.3 and will be
3266 // removed without notice in a future release. These options
3267 // are not to be documented.
3268 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3269 // No longer used.
3270 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3271 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3272 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3273 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3274 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3275 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3276 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3277 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3278 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3279 // No longer used.
3280 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3281 julong long_tlab_size = 0;
3282 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3283 if (errcode != arg_in_range) {
3284 jio_fprintf(defaultStream::error_stream(),
3285 "Invalid TLAB size: %s\n", option->optionString);
3286 describe_range_error(errcode);
3287 return JNI_EINVAL;
3288 }
3289 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3290 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3291 // No longer used.
3292 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3293 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3294 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3295 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3296 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3297 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3298 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3299 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3300 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3301 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3302 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3303 #if defined(DTRACE_ENABLED)
3304 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3305 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3306 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3307 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3308 #else // defined(DTRACE_ENABLED)
3309 jio_fprintf(defaultStream::error_stream(),
3310 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3311 return JNI_EINVAL;
3312 #endif // defined(DTRACE_ENABLED)
3313 #ifdef ASSERT
3314 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3315 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3316 // disable scavenge before parallel mark-compact
3317 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3318 #endif
3319 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3320 julong cms_blocks_to_claim = (julong)atol(tail);
3321 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Please use -XX:OldPLABSize in place of "
3324 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3325 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3326 julong cms_blocks_to_claim = (julong)atol(tail);
3327 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3328 jio_fprintf(defaultStream::error_stream(),
3329 "Please use -XX:OldPLABSize in place of "
3330 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3331 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3332 julong old_plab_size = 0;
3333 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3334 if (errcode != arg_in_range) {
3335 jio_fprintf(defaultStream::error_stream(),
3336 "Invalid old PLAB size: %s\n", option->optionString);
3337 describe_range_error(errcode);
3338 return JNI_EINVAL;
3339 }
3340 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Please use -XX:OldPLABSize in place of "
3343 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3344 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3345 julong young_plab_size = 0;
3346 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3347 if (errcode != arg_in_range) {
3348 jio_fprintf(defaultStream::error_stream(),
3349 "Invalid young PLAB size: %s\n", option->optionString);
3350 describe_range_error(errcode);
3351 return JNI_EINVAL;
3352 }
3353 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3354 jio_fprintf(defaultStream::error_stream(),
3355 "Please use -XX:YoungPLABSize in place of "
3356 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3357 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3358 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3359 julong stack_size = 0;
3360 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3361 if (errcode != arg_in_range) {
3362 jio_fprintf(defaultStream::error_stream(),
3363 "Invalid mark stack size: %s\n", option->optionString);
3364 describe_range_error(errcode);
3365 return JNI_EINVAL;
3366 }
3367 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3368 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3369 julong max_stack_size = 0;
3370 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3371 if (errcode != arg_in_range) {
3372 jio_fprintf(defaultStream::error_stream(),
3373 "Invalid maximum mark stack size: %s\n",
3374 option->optionString);
3375 describe_range_error(errcode);
3376 return JNI_EINVAL;
3377 }
3378 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3379 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3380 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3381 uintx conc_threads = 0;
3382 if (!parse_uintx(tail, &conc_threads, 1)) {
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Invalid concurrent threads: %s\n", option->optionString);
3385 return JNI_EINVAL;
3386 }
3387 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3388 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3389 julong max_direct_memory_size = 0;
3390 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3391 if (errcode != arg_in_range) {
3392 jio_fprintf(defaultStream::error_stream(),
3393 "Invalid maximum direct memory size: %s\n",
3394 option->optionString);
3395 describe_range_error(errcode);
3396 return JNI_EINVAL;
3397 }
3398 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3399 #if !INCLUDE_MANAGEMENT
3400 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3401 jio_fprintf(defaultStream::error_stream(),
3402 "ManagementServer is not supported in this VM.\n");
3403 return JNI_ERR;
3404 #endif // INCLUDE_MANAGEMENT
3405 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3406 // Skip -XX:Flags= since that case has already been handled
3407 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3408 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3409 return JNI_EINVAL;
3410 }
3411 }
3412 // Unknown option
3413 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3414 return JNI_ERR;
3415 }
3416 }
3417
3418 // PrintSharedArchiveAndExit will turn on
3419 // -Xshare:on
3420 // -XX:+TraceClassPaths
3421 if (PrintSharedArchiveAndExit) {
3422 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3423 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3424 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3425 }
3426
3427 // Change the default value for flags which have different default values
3428 // when working with older JDKs.
3429 #ifdef LINUX
3430 if (JDK_Version::current().compare_major(6) <= 0 &&
3431 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3432 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3433 }
3434 #endif // LINUX
3435 fix_appclasspath();
3436 return JNI_OK;
3437 }
3438
3439 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3440 //
3441 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3442 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3443 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3444 // path is treated as the current directory.
3445 //
3446 // This causes problems with CDS, which requires that all directories specified in the classpath
3447 // must be empty. In most cases, applications do NOT want to load classes from the current
3448 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3449 // scripts compatible with CDS.
3450 void Arguments::fix_appclasspath() {
3451 if (IgnoreEmptyClassPaths) {
3452 const char separator = *os::path_separator();
3453 const char* src = _java_class_path->value();
3454
3455 // skip over all the leading empty paths
3456 while (*src == separator) {
3457 src ++;
3458 }
3459
3460 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3461 strncpy(copy, src, strlen(src) + 1);
3462
3463 // trim all trailing empty paths
3464 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3465 *tail = '\0';
3466 }
3467
3468 char from[3] = {separator, separator, '\0'};
3469 char to [2] = {separator, '\0'};
3470 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3471 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3472 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3473 }
3474
3475 _java_class_path->set_value(copy);
3476 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3477 }
3478
3479 if (!PrintSharedArchiveAndExit) {
3480 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3481 }
3482 }
3483
3484 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3485 // This must be done after all -D arguments have been processed.
3486 scp_p->expand_endorsed();
3487
3488 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3489 // Assemble the bootclasspath elements into the final path.
3490 Arguments::set_sysclasspath(scp_p->combined_path());
3491 }
3492
3493 // This must be done after all arguments have been processed.
3494 // java_compiler() true means set to "NONE" or empty.
3495 if (java_compiler() && !xdebug_mode()) {
3496 // For backwards compatibility, we switch to interpreted mode if
3497 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3498 // not specified.
3499 set_mode_flags(_int);
3500 }
3501
3502 if ((TieredCompilation && CompileThresholdScaling == 0)
3503 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3504 set_mode_flags(_int);
3505 }
3506
3507 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3508 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3509 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3510 }
3511
3512 #ifndef COMPILER2
3513 // Don't degrade server performance for footprint
3514 if (FLAG_IS_DEFAULT(UseLargePages) &&
3515 MaxHeapSize < LargePageHeapSizeThreshold) {
3516 // No need for large granularity pages w/small heaps.
3517 // Note that large pages are enabled/disabled for both the
3518 // Java heap and the code cache.
3519 FLAG_SET_DEFAULT(UseLargePages, false);
3520 }
3521
3522 #else
3523 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3524 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3525 }
3526 #endif
3527
3528 #ifndef TIERED
3529 // Tiered compilation is undefined.
3530 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3531 #endif
3532
3533 // If we are running in a headless jre, force java.awt.headless property
3534 // to be true unless the property has already been set.
3535 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3536 if (os::is_headless_jre()) {
3537 const char* headless = Arguments::get_property("java.awt.headless");
3538 if (headless == NULL) {
3539 char envbuffer[128];
3540 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3541 if (!add_property("java.awt.headless=true")) {
3542 return JNI_ENOMEM;
3543 }
3544 } else {
3545 char buffer[256];
3546 strcpy(buffer, "java.awt.headless=");
3547 strcat(buffer, envbuffer);
3548 if (!add_property(buffer)) {
3549 return JNI_ENOMEM;
3550 }
3551 }
3552 }
3553 }
3554
3555 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3556 // CMS can only be used with ParNew
3557 FLAG_SET_ERGO(bool, UseParNewGC, true);
3558 }
3559
3560 if (!check_vm_args_consistency()) {
3561 return JNI_ERR;
3562 }
3563
3564 return JNI_OK;
3565 }
3566
3567 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3568 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3569 scp_assembly_required_p);
3570 }
3571
3572 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3573 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3574 scp_assembly_required_p);
3575 }
3576
3577 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3578 const int N_MAX_OPTIONS = 64;
3579 const int OPTION_BUFFER_SIZE = 1024;
3580 char buffer[OPTION_BUFFER_SIZE];
3581
3582 // The variable will be ignored if it exceeds the length of the buffer.
3583 // Don't check this variable if user has special privileges
3584 // (e.g. unix su command).
3585 if (os::getenv(name, buffer, sizeof(buffer)) &&
3586 !os::have_special_privileges()) {
3587 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3588 jio_fprintf(defaultStream::error_stream(),
3589 "Picked up %s: %s\n", name, buffer);
3590 char* rd = buffer; // pointer to the input string (rd)
3591 int i;
3592 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3593 while (isspace(*rd)) rd++; // skip whitespace
3594 if (*rd == 0) break; // we re done when the input string is read completely
3595
3596 // The output, option string, overwrites the input string.
3597 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3598 // input string (rd).
3599 char* wrt = rd;
3600
3601 options[i++].optionString = wrt; // Fill in option
3602 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3603 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3604 int quote = *rd; // matching quote to look for
3605 rd++; // don't copy open quote
3606 while (*rd != quote) { // include everything (even spaces) up until quote
3607 if (*rd == 0) { // string termination means unmatched string
3608 jio_fprintf(defaultStream::error_stream(),
3609 "Unmatched quote in %s\n", name);
3610 return JNI_ERR;
3611 }
3612 *wrt++ = *rd++; // copy to option string
3613 }
3614 rd++; // don't copy close quote
3615 } else {
3616 *wrt++ = *rd++; // copy to option string
3617 }
3618 }
3619 // Need to check if we're done before writing a NULL,
3620 // because the write could be to the byte that rd is pointing to.
3621 if (*rd++ == 0) {
3622 *wrt = 0;
3623 break;
3624 }
3625 *wrt = 0; // Zero terminate option
3626 }
3627 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3628 JavaVMInitArgs vm_args;
3629 vm_args.version = JNI_VERSION_1_2;
3630 vm_args.options = options;
3631 vm_args.nOptions = i;
3632 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3633
3634 if (PrintVMOptions) {
3635 const char* tail;
3636 for (int i = 0; i < vm_args.nOptions; i++) {
3637 const JavaVMOption *option = vm_args.options + i;
3638 if (match_option(option, "-XX:", &tail)) {
3639 logOption(tail);
3640 }
3641 }
3642 }
3643
3644 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3645 }
3646 return JNI_OK;
3647 }
3648
3649 void Arguments::set_shared_spaces_flags() {
3650 if (DumpSharedSpaces) {
3651 if (RequireSharedSpaces) {
3652 warning("cannot dump shared archive while using shared archive");
3653 }
3654 UseSharedSpaces = false;
3655 #ifdef _LP64
3656 if (!UseCompressedOops || !UseCompressedClassPointers) {
3657 vm_exit_during_initialization(
3658 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3659 }
3660 } else {
3661 if (!UseCompressedOops || !UseCompressedClassPointers) {
3662 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3663 }
3664 #endif
3665 }
3666 }
3667
3668 #if !INCLUDE_ALL_GCS
3669 static void force_serial_gc() {
3670 FLAG_SET_DEFAULT(UseSerialGC, true);
3671 UNSUPPORTED_GC_OPTION(UseG1GC);
3672 UNSUPPORTED_GC_OPTION(UseParallelGC);
3673 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3674 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3675 UNSUPPORTED_GC_OPTION(UseParNewGC);
3676 }
3677 #endif // INCLUDE_ALL_GCS
3678
3679 // Sharing support
3680 // Construct the path to the archive
3681 static char* get_shared_archive_path() {
3682 char *shared_archive_path;
3683 if (SharedArchiveFile == NULL) {
3684 char jvm_path[JVM_MAXPATHLEN];
3685 os::jvm_path(jvm_path, sizeof(jvm_path));
3686 char *end = strrchr(jvm_path, *os::file_separator());
3687 if (end != NULL) *end = '\0';
3688 size_t jvm_path_len = strlen(jvm_path);
3689 size_t file_sep_len = strlen(os::file_separator());
3690 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3691 file_sep_len + 20, mtInternal);
3692 if (shared_archive_path != NULL) {
3693 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3694 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3695 strncat(shared_archive_path, "classes.jsa", 11);
3696 }
3697 } else {
3698 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3699 if (shared_archive_path != NULL) {
3700 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3701 }
3702 }
3703 return shared_archive_path;
3704 }
3705
3706 #ifndef PRODUCT
3707 // Determine whether LogVMOutput should be implicitly turned on.
3708 static bool use_vm_log() {
3709 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3710 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3711 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3712 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3713 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3714 return true;
3715 }
3716
3717 #ifdef COMPILER1
3718 if (PrintC1Statistics) {
3719 return true;
3720 }
3721 #endif // COMPILER1
3722
3723 #ifdef COMPILER2
3724 if (PrintOptoAssembly || PrintOptoStatistics) {
3725 return true;
3726 }
3727 #endif // COMPILER2
3728
3729 return false;
3730 }
3731 #endif // PRODUCT
3732
3733 // Parse entry point called from JNI_CreateJavaVM
3734
3735 jint Arguments::parse(const JavaVMInitArgs* args) {
3736
3737 // Remaining part of option string
3738 const char* tail;
3739
3740 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3741 const char* hotspotrc = ".hotspotrc";
3742 bool settings_file_specified = false;
3743 bool needs_hotspotrc_warning = false;
3744
3745 const char* flags_file;
3746 int index;
3747 for (index = 0; index < args->nOptions; index++) {
3748 const JavaVMOption *option = args->options + index;
3749 if (ArgumentsExt::process_options(option)) {
3750 continue;
3751 }
3752 if (match_option(option, "-XX:Flags=", &tail)) {
3753 flags_file = tail;
3754 settings_file_specified = true;
3755 continue;
3756 }
3757 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3758 PrintVMOptions = true;
3759 continue;
3760 }
3761 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3762 PrintVMOptions = false;
3763 continue;
3764 }
3765 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3766 IgnoreUnrecognizedVMOptions = true;
3767 continue;
3768 }
3769 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3770 IgnoreUnrecognizedVMOptions = false;
3771 continue;
3772 }
3773 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3774 CommandLineFlags::printFlags(tty, false);
3775 vm_exit(0);
3776 }
3777 #if INCLUDE_NMT
3778 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3779 // The launcher did not setup nmt environment variable properly.
3780 if (!MemTracker::check_launcher_nmt_support(tail)) {
3781 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3782 }
3783
3784 // Verify if nmt option is valid.
3785 if (MemTracker::verify_nmt_option()) {
3786 // Late initialization, still in single-threaded mode.
3787 if (MemTracker::tracking_level() >= NMT_summary) {
3788 MemTracker::init();
3789 }
3790 } else {
3791 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3792 }
3793 continue;
3794 }
3795 #endif
3796
3797
3798 #ifndef PRODUCT
3799 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3800 CommandLineFlags::printFlags(tty, true);
3801 vm_exit(0);
3802 }
3803 #endif
3804 }
3805
3806 if (IgnoreUnrecognizedVMOptions) {
3807 // uncast const to modify the flag args->ignoreUnrecognized
3808 *(jboolean*)(&args->ignoreUnrecognized) = true;
3809 }
3810
3811 // Parse specified settings file
3812 if (settings_file_specified) {
3813 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3814 return JNI_EINVAL;
3815 }
3816 } else {
3817 #ifdef ASSERT
3818 // Parse default .hotspotrc settings file
3819 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3820 return JNI_EINVAL;
3821 }
3822 #else
3823 struct stat buf;
3824 if (os::stat(hotspotrc, &buf) == 0) {
3825 needs_hotspotrc_warning = true;
3826 }
3827 #endif
3828 }
3829
3830 if (PrintVMOptions) {
3831 for (index = 0; index < args->nOptions; index++) {
3832 const JavaVMOption *option = args->options + index;
3833 if (match_option(option, "-XX:", &tail)) {
3834 logOption(tail);
3835 }
3836 }
3837 }
3838
3839 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3840 jint result = parse_vm_init_args(args);
3841 if (result != JNI_OK) {
3842 return result;
3843 }
3844
3845 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3846 SharedArchivePath = get_shared_archive_path();
3847 if (SharedArchivePath == NULL) {
3848 return JNI_ENOMEM;
3849 }
3850
3851 // Set up VerifySharedSpaces
3852 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3853 VerifySharedSpaces = true;
3854 }
3855
3856 // Delay warning until here so that we've had a chance to process
3857 // the -XX:-PrintWarnings flag
3858 if (needs_hotspotrc_warning) {
3859 warning("%s file is present but has been ignored. "
3860 "Run with -XX:Flags=%s to load the file.",
3861 hotspotrc, hotspotrc);
3862 }
3863
3864 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3865 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3866 #endif
3867
3868 #if INCLUDE_ALL_GCS
3869 #if (defined JAVASE_EMBEDDED || defined ARM)
3870 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3871 #endif
3872 #endif
3873
3874 #ifndef PRODUCT
3875 if (TraceBytecodesAt != 0) {
3876 TraceBytecodes = true;
3877 }
3878 if (CountCompiledCalls) {
3879 if (UseCounterDecay) {
3880 warning("UseCounterDecay disabled because CountCalls is set");
3881 UseCounterDecay = false;
3882 }
3883 }
3884 #endif // PRODUCT
3885
3886 if (ScavengeRootsInCode == 0) {
3887 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3888 warning("forcing ScavengeRootsInCode non-zero");
3889 }
3890 ScavengeRootsInCode = 1;
3891 }
3892
3893 if (PrintGCDetails) {
3894 // Turn on -verbose:gc options as well
3895 PrintGC = true;
3896 }
3897
3898 // Set object alignment values.
3899 set_object_alignment();
3900
3901 #if !INCLUDE_ALL_GCS
3902 force_serial_gc();
3903 #endif // INCLUDE_ALL_GCS
3904 #if !INCLUDE_CDS
3905 if (DumpSharedSpaces || RequireSharedSpaces) {
3906 jio_fprintf(defaultStream::error_stream(),
3907 "Shared spaces are not supported in this VM\n");
3908 return JNI_ERR;
3909 }
3910 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3911 warning("Shared spaces are not supported in this VM");
3912 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3913 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3914 }
3915 no_shared_spaces("CDS Disabled");
3916 #endif // INCLUDE_CDS
3917
3918 return JNI_OK;
3919 }
3920
3921 jint Arguments::apply_ergo() {
3922
3923 // Set flags based on ergonomics.
3924 set_ergonomics_flags();
3925
3926 set_shared_spaces_flags();
3927
3928 // Check the GC selections again.
3929 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3930 return JNI_EINVAL;
3931 }
3932
3933 if (TieredCompilation) {
3934 set_tiered_flags();
3935 } else {
3936 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3937 if (CompilationPolicyChoice >= 2) {
3938 vm_exit_during_initialization(
3939 "Incompatible compilation policy selected", NULL);
3940 }
3941 // Scale CompileThreshold
3942 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3943 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
3944 }
3945 }
3946
3947 #ifdef COMPILER2
3948 #ifndef PRODUCT
3949 if (PrintIdealGraphLevel > 0) {
3950 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3951 }
3952 #endif
3953 #endif
3954
3955 // Set heap size based on available physical memory
3956 set_heap_size();
3957
3958 ArgumentsExt::set_gc_specific_flags();
3959
3960 // Initialize Metaspace flags and alignments
3961 Metaspace::ergo_initialize();
3962
3963 // Set bytecode rewriting flags
3964 set_bytecode_flags();
3965
3966 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3967 set_aggressive_opts_flags();
3968
3969 // Turn off biased locking for locking debug mode flags,
3970 // which are subtly different from each other but neither works with
3971 // biased locking
3972 if (UseHeavyMonitors
3973 #ifdef COMPILER1
3974 || !UseFastLocking
3975 #endif // COMPILER1
3976 ) {
3977 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3978 // flag set to true on command line; warn the user that they
3979 // can't enable biased locking here
3980 warning("Biased Locking is not supported with locking debug flags"
3981 "; ignoring UseBiasedLocking flag." );
3982 }
3983 UseBiasedLocking = false;
3984 }
3985
3986 #ifdef ZERO
3987 // Clear flags not supported on zero.
3988 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3989 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3990 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3991 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3992 #endif // CC_INTERP
3993
3994 #ifdef COMPILER2
3995 if (!EliminateLocks) {
3996 EliminateNestedLocks = false;
3997 }
3998 if (!Inline) {
3999 IncrementalInline = false;
4000 }
4001 #ifndef PRODUCT
4002 if (!IncrementalInline) {
4003 AlwaysIncrementalInline = false;
4004 }
4005 #endif
4006 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4007 // nothing to use the profiling, turn if off
4008 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4009 }
4010 #endif
4011
4012 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4013 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4014 DebugNonSafepoints = true;
4015 }
4016
4017 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4018 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4019 }
4020
4021 #ifndef PRODUCT
4022 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4023 if (use_vm_log()) {
4024 LogVMOutput = true;
4025 }
4026 }
4027 #endif // PRODUCT
4028
4029 if (PrintCommandLineFlags) {
4030 CommandLineFlags::printSetFlags(tty);
4031 }
4032
4033 // Apply CPU specific policy for the BiasedLocking
4034 if (UseBiasedLocking) {
4035 if (!VM_Version::use_biased_locking() &&
4036 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4037 UseBiasedLocking = false;
4038 }
4039 }
4040 #ifdef COMPILER2
4041 if (!UseBiasedLocking || EmitSync != 0) {
4042 UseOptoBiasInlining = false;
4043 }
4044 #endif
4045
4046 return JNI_OK;
4047 }
4048
4049 jint Arguments::adjust_after_os() {
4050 if (UseNUMA) {
4051 if (UseParallelGC || UseParallelOldGC) {
4052 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4053 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4054 }
4055 }
4056 // UseNUMAInterleaving is set to ON for all collectors and
4057 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4058 // such as the parallel collector for Linux and Solaris will
4059 // interleave old gen and survivor spaces on top of NUMA
4060 // allocation policy for the eden space.
4061 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4062 // all platforms and ParallelGC on Windows will interleave all
4063 // of the heap spaces across NUMA nodes.
4064 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4065 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4066 }
4067 }
4068 return JNI_OK;
4069 }
4070
4071 int Arguments::PropertyList_count(SystemProperty* pl) {
4072 int count = 0;
4073 while(pl != NULL) {
4074 count++;
4075 pl = pl->next();
4076 }
4077 return count;
4078 }
4079
4080 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4081 assert(key != NULL, "just checking");
4082 SystemProperty* prop;
4083 for (prop = pl; prop != NULL; prop = prop->next()) {
4084 if (strcmp(key, prop->key()) == 0) return prop->value();
4085 }
4086 return NULL;
4087 }
4088
4089 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4090 int count = 0;
4091 const char* ret_val = NULL;
4092
4093 while(pl != NULL) {
4094 if(count >= index) {
4095 ret_val = pl->key();
4096 break;
4097 }
4098 count++;
4099 pl = pl->next();
4100 }
4101
4102 return ret_val;
4103 }
4104
4105 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4106 int count = 0;
4107 char* ret_val = NULL;
4108
4109 while(pl != NULL) {
4110 if(count >= index) {
4111 ret_val = pl->value();
4112 break;
4113 }
4114 count++;
4115 pl = pl->next();
4116 }
4117
4118 return ret_val;
4119 }
4120
4121 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4122 SystemProperty* p = *plist;
4123 if (p == NULL) {
4124 *plist = new_p;
4125 } else {
4126 while (p->next() != NULL) {
4127 p = p->next();
4128 }
4129 p->set_next(new_p);
4130 }
4131 }
4132
4133 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4134 if (plist == NULL)
4135 return;
4136
4137 SystemProperty* new_p = new SystemProperty(k, v, true);
4138 PropertyList_add(plist, new_p);
4139 }
4140
4141 // This add maintains unique property key in the list.
4142 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4143 if (plist == NULL)
4144 return;
4145
4146 // If property key exist then update with new value.
4147 SystemProperty* prop;
4148 for (prop = *plist; prop != NULL; prop = prop->next()) {
4149 if (strcmp(k, prop->key()) == 0) {
4150 if (append) {
4151 prop->append_value(v);
4152 } else {
4153 prop->set_value(v);
4154 }
4155 return;
4156 }
4157 }
4158
4159 PropertyList_add(plist, k, v);
4160 }
4161
4162 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4163 // Returns true if all of the source pointed by src has been copied over to
4164 // the destination buffer pointed by buf. Otherwise, returns false.
4165 // Notes:
4166 // 1. If the length (buflen) of the destination buffer excluding the
4167 // NULL terminator character is not long enough for holding the expanded
4168 // pid characters, it also returns false instead of returning the partially
4169 // expanded one.
4170 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4171 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4172 char* buf, size_t buflen) {
4173 const char* p = src;
4174 char* b = buf;
4175 const char* src_end = &src[srclen];
4176 char* buf_end = &buf[buflen - 1];
4177
4178 while (p < src_end && b < buf_end) {
4179 if (*p == '%') {
4180 switch (*(++p)) {
4181 case '%': // "%%" ==> "%"
4182 *b++ = *p++;
4183 break;
4184 case 'p': { // "%p" ==> current process id
4185 // buf_end points to the character before the last character so
4186 // that we could write '\0' to the end of the buffer.
4187 size_t buf_sz = buf_end - b + 1;
4188 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4189
4190 // if jio_snprintf fails or the buffer is not long enough to hold
4191 // the expanded pid, returns false.
4192 if (ret < 0 || ret >= (int)buf_sz) {
4193 return false;
4194 } else {
4195 b += ret;
4196 assert(*b == '\0', "fail in copy_expand_pid");
4197 if (p == src_end && b == buf_end + 1) {
4198 // reach the end of the buffer.
4199 return true;
4200 }
4201 }
4202 p++;
4203 break;
4204 }
4205 default :
4206 *b++ = '%';
4207 }
4208 } else {
4209 *b++ = *p++;
4210 }
4211 }
4212 *b = '\0';
4213 return (p == src_end); // return false if not all of the source was copied
4214 }