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 // Return true if any of the strings in null-terminated array 'names' matches.
143 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
144 // the option must match exactly.
145 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
146 bool tail_allowed) {
147 for (/* empty */; *names != NULL; ++names) {
148 if (match_option(option, *names, tail)) {
149 if (**tail == '\0' || tail_allowed && **tail == ':') {
150 return true;
151 }
152 }
153 }
154 return false;
155 }
156
157 static bool match_option(const JavaVMOption *option, const char* name) {
158 const char* tail = NULL;
159 bool result = match_option(option, name, &tail);
160 if (tail != NULL && *tail == '\0') {
161 return result;
162 } else {
163 return false;
164 }
165 }
166
167 static void logOption(const char* opt) {
168 if (PrintVMOptions) {
169 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
170 }
171 }
172
173 // Process java launcher properties.
174 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
175 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
176 // sun.java.launcher.pid is defined.
177 // Must do this before setting up other system properties,
178 // as some of them may depend on launcher type.
179 for (int index = 0; index < args->nOptions; index++) {
180 const JavaVMOption* option = args->options + index;
181 const char* tail;
182
183 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
184 process_java_launcher_argument(tail, option->extraInfo);
185 continue;
186 }
187 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
188 if (strcmp(tail, "true") == 0) {
189 _sun_java_launcher_is_altjvm = true;
190 }
191 continue;
192 }
193 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
194 _sun_java_launcher_pid = atoi(tail);
195 continue;
196 }
197 }
198 }
199
200 // Initialize system properties key and value.
201 void Arguments::init_system_properties() {
202
203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
204 "Java Virtual Machine Specification", false));
205 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
206 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
208
209 // Following are JVMTI agent writable properties.
210 // Properties values are set to NULL and they are
211 // os specific they are initialized in os::init_system_properties_values().
212 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
213 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
214 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
215 _java_library_path = new SystemProperty("java.library.path", NULL, true);
216 _java_home = new SystemProperty("java.home", NULL, true);
217 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
218
219 _java_class_path = new SystemProperty("java.class.path", "", true);
220
221 // Add to System Property list.
222 PropertyList_add(&_system_properties, _java_ext_dirs);
223 PropertyList_add(&_system_properties, _java_endorsed_dirs);
224 PropertyList_add(&_system_properties, _sun_boot_library_path);
225 PropertyList_add(&_system_properties, _java_library_path);
226 PropertyList_add(&_system_properties, _java_home);
227 PropertyList_add(&_system_properties, _java_class_path);
228 PropertyList_add(&_system_properties, _sun_boot_class_path);
229
230 // Set OS specific system properties values
231 os::init_system_properties_values();
232 }
233
234
235 // Update/Initialize System properties after JDK version number is known
236 void Arguments::init_version_specific_system_properties() {
237 enum { bufsz = 16 };
238 char buffer[bufsz];
239 const char* spec_vendor = "Sun Microsystems Inc.";
240 uint32_t spec_version = 0;
241
242 spec_vendor = "Oracle Corporation";
243 spec_version = JDK_Version::current().major_version();
244 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
245
246 PropertyList_add(&_system_properties,
247 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
248 PropertyList_add(&_system_properties,
249 new SystemProperty("java.vm.specification.version", buffer, false));
250 PropertyList_add(&_system_properties,
251 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
252 }
253
254 /**
255 * Provide a slightly more user-friendly way of eliminating -XX flags.
256 * When a flag is eliminated, it can be added to this list in order to
257 * continue accepting this flag on the command-line, while issuing a warning
258 * and ignoring the value. Once the JDK version reaches the 'accept_until'
259 * limit, we flatly refuse to admit the existence of the flag. This allows
260 * a flag to die correctly over JDK releases using HSX.
261 */
262 typedef struct {
263 const char* name;
264 JDK_Version obsoleted_in; // when the flag went away
265 JDK_Version accept_until; // which version to start denying the existence
266 } ObsoleteFlag;
267
268 static ObsoleteFlag obsolete_jvm_flags[] = {
269 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
270 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
271 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
272 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
273 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
274 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
275 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
276 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
277 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
278 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
279 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
280 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
281 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
282 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
283 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
284 { "DefaultInitialRAMFraction",
285 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
286 { "UseDepthFirstScavengeOrder",
287 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
288 { "HandlePromotionFailure",
289 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
290 { "MaxLiveObjectEvacuationRatio",
291 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
292 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
293 { "UseParallelOldGCCompacting",
294 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
295 { "UseParallelDensePrefixUpdate",
296 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
297 { "UseParallelOldGCDensePrefix",
298 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
299 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
300 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
301 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
305 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
306 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
307 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
309 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
312 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
313 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
314 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
315 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
316 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
317 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
318 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
319 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
320 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
321 #ifdef PRODUCT
322 { "DesiredMethodLimit",
323 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
324 #endif // PRODUCT
325 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
326 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
327 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
328 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
329 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
330 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
331 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
332 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
333 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
334 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
335 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
336 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
337 #ifndef ZERO
338 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
339 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
340 #endif // ZERO
341 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
342 { NULL, JDK_Version(0), JDK_Version(0) }
343 };
344
345 // Returns true if the flag is obsolete and fits into the range specified
346 // for being ignored. In the case that the flag is ignored, the 'version'
347 // value is filled in with the version number when the flag became
348 // obsolete so that that value can be displayed to the user.
349 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
350 int i = 0;
351 assert(version != NULL, "Must provide a version buffer");
352 while (obsolete_jvm_flags[i].name != NULL) {
353 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
354 // <flag>=xxx form
355 // [-|+]<flag> form
356 size_t len = strlen(flag_status.name);
357 if (((strncmp(flag_status.name, s, len) == 0) &&
358 (strlen(s) == len)) ||
359 ((s[0] == '+' || s[0] == '-') &&
360 (strncmp(flag_status.name, &s[1], len) == 0) &&
361 (strlen(&s[1]) == len))) {
362 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
363 *version = flag_status.obsoleted_in;
364 return true;
365 }
366 }
367 i++;
368 }
369 return false;
370 }
371
372 // Constructs the system class path (aka boot class path) from the following
373 // components, in order:
374 //
375 // prefix // from -Xbootclasspath/p:...
376 // endorsed // the expansion of -Djava.endorsed.dirs=...
377 // base // from os::get_system_properties() or -Xbootclasspath=
378 // suffix // from -Xbootclasspath/a:...
379 //
380 // java.endorsed.dirs is a list of directories; any jar or zip files in the
381 // directories are added to the sysclasspath just before the base.
382 //
383 // This could be AllStatic, but it isn't needed after argument processing is
384 // complete.
385 class SysClassPath: public StackObj {
386 public:
387 SysClassPath(const char* base);
388 ~SysClassPath();
389
390 inline void set_base(const char* base);
391 inline void add_prefix(const char* prefix);
392 inline void add_suffix_to_prefix(const char* suffix);
393 inline void add_suffix(const char* suffix);
394 inline void reset_path(const char* base);
395
396 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
397 // property. Must be called after all command-line arguments have been
398 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
399 // combined_path().
400 void expand_endorsed();
401
402 inline const char* get_base() const { return _items[_scp_base]; }
403 inline const char* get_prefix() const { return _items[_scp_prefix]; }
404 inline const char* get_suffix() const { return _items[_scp_suffix]; }
405 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
406
407 // Combine all the components into a single c-heap-allocated string; caller
408 // must free the string if/when no longer needed.
409 char* combined_path();
410
411 private:
412 // Utility routines.
413 static char* add_to_path(const char* path, const char* str, bool prepend);
414 static char* add_jars_to_path(char* path, const char* directory);
415
416 inline void reset_item_at(int index);
417
418 // Array indices for the items that make up the sysclasspath. All except the
419 // base are allocated in the C heap and freed by this class.
420 enum {
421 _scp_prefix, // from -Xbootclasspath/p:...
422 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
423 _scp_base, // the default sysclasspath
424 _scp_suffix, // from -Xbootclasspath/a:...
425 _scp_nitems // the number of items, must be last.
426 };
427
428 const char* _items[_scp_nitems];
429 DEBUG_ONLY(bool _expansion_done;)
430 };
431
432 SysClassPath::SysClassPath(const char* base) {
433 memset(_items, 0, sizeof(_items));
434 _items[_scp_base] = base;
435 DEBUG_ONLY(_expansion_done = false;)
436 }
437
438 SysClassPath::~SysClassPath() {
439 // Free everything except the base.
440 for (int i = 0; i < _scp_nitems; ++i) {
441 if (i != _scp_base) reset_item_at(i);
442 }
443 DEBUG_ONLY(_expansion_done = false;)
444 }
445
446 inline void SysClassPath::set_base(const char* base) {
447 _items[_scp_base] = base;
448 }
449
450 inline void SysClassPath::add_prefix(const char* prefix) {
451 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
452 }
453
454 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
455 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
456 }
457
458 inline void SysClassPath::add_suffix(const char* suffix) {
459 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
460 }
461
462 inline void SysClassPath::reset_item_at(int index) {
463 assert(index < _scp_nitems && index != _scp_base, "just checking");
464 if (_items[index] != NULL) {
465 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
466 _items[index] = NULL;
467 }
468 }
469
470 inline void SysClassPath::reset_path(const char* base) {
471 // Clear the prefix and suffix.
472 reset_item_at(_scp_prefix);
473 reset_item_at(_scp_suffix);
474 set_base(base);
475 }
476
477 //------------------------------------------------------------------------------
478
479 void SysClassPath::expand_endorsed() {
480 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
481
482 const char* path = Arguments::get_property("java.endorsed.dirs");
483 if (path == NULL) {
484 path = Arguments::get_endorsed_dir();
485 assert(path != NULL, "no default for java.endorsed.dirs");
486 }
487
488 char* expanded_path = NULL;
489 const char separator = *os::path_separator();
490 const char* const end = path + strlen(path);
491 while (path < end) {
492 const char* tmp_end = strchr(path, separator);
493 if (tmp_end == NULL) {
494 expanded_path = add_jars_to_path(expanded_path, path);
495 path = end;
496 } else {
497 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
498 memcpy(dirpath, path, tmp_end - path);
499 dirpath[tmp_end - path] = '\0';
500 expanded_path = add_jars_to_path(expanded_path, dirpath);
501 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
502 path = tmp_end + 1;
503 }
504 }
505 _items[_scp_endorsed] = expanded_path;
506 DEBUG_ONLY(_expansion_done = true;)
507 }
508
509 // Combine the bootclasspath elements, some of which may be null, into a single
510 // c-heap-allocated string.
511 char* SysClassPath::combined_path() {
512 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
513 assert(_expansion_done, "must call expand_endorsed() first.");
514
515 size_t lengths[_scp_nitems];
516 size_t total_len = 0;
517
518 const char separator = *os::path_separator();
519
520 // Get the lengths.
521 int i;
522 for (i = 0; i < _scp_nitems; ++i) {
523 if (_items[i] != NULL) {
524 lengths[i] = strlen(_items[i]);
525 // Include space for the separator char (or a NULL for the last item).
526 total_len += lengths[i] + 1;
527 }
528 }
529 assert(total_len > 0, "empty sysclasspath not allowed");
530
531 // Copy the _items to a single string.
532 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
533 char* cp_tmp = cp;
534 for (i = 0; i < _scp_nitems; ++i) {
535 if (_items[i] != NULL) {
536 memcpy(cp_tmp, _items[i], lengths[i]);
537 cp_tmp += lengths[i];
538 *cp_tmp++ = separator;
539 }
540 }
541 *--cp_tmp = '\0'; // Replace the extra separator.
542 return cp;
543 }
544
545 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
546 char*
547 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
548 char *cp;
549
550 assert(str != NULL, "just checking");
551 if (path == NULL) {
552 size_t len = strlen(str) + 1;
553 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
554 memcpy(cp, str, len); // copy the trailing null
555 } else {
556 const char separator = *os::path_separator();
557 size_t old_len = strlen(path);
558 size_t str_len = strlen(str);
559 size_t len = old_len + str_len + 2;
560
561 if (prepend) {
562 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
563 char* cp_tmp = cp;
564 memcpy(cp_tmp, str, str_len);
565 cp_tmp += str_len;
566 *cp_tmp = separator;
567 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
568 FREE_C_HEAP_ARRAY(char, path, mtInternal);
569 } else {
570 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
571 char* cp_tmp = cp + old_len;
572 *cp_tmp = separator;
573 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
574 }
575 }
576 return cp;
577 }
578
579 // Scan the directory and append any jar or zip files found to path.
580 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
581 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
582 DIR* dir = os::opendir(directory);
583 if (dir == NULL) return path;
584
585 char dir_sep[2] = { '\0', '\0' };
586 size_t directory_len = strlen(directory);
587 const char fileSep = *os::file_separator();
588 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
589
590 /* Scan the directory for jars/zips, appending them to path. */
591 struct dirent *entry;
592 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
593 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
594 const char* name = entry->d_name;
595 const char* ext = name + strlen(name) - 4;
596 bool isJarOrZip = ext > name &&
597 (os::file_name_strcmp(ext, ".jar") == 0 ||
598 os::file_name_strcmp(ext, ".zip") == 0);
599 if (isJarOrZip) {
600 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
601 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
602 path = add_to_path(path, jarpath, false);
603 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
604 }
605 }
606 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
607 os::closedir(dir);
608 return path;
609 }
610
611 // Parses a memory size specification string.
612 static bool atomull(const char *s, julong* result) {
613 julong n = 0;
614 int args_read = 0;
615 bool is_hex = false;
616 // Skip leading 0[xX] for hexadecimal
617 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
618 s += 2;
619 is_hex = true;
620 args_read = sscanf(s, JULONG_FORMAT_X, &n);
621 } else {
622 args_read = sscanf(s, JULONG_FORMAT, &n);
623 }
624 if (args_read != 1) {
625 return false;
626 }
627 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
628 s++;
629 }
630 // 4705540: illegal if more characters are found after the first non-digit
631 if (strlen(s) > 1) {
632 return false;
633 }
634 switch (*s) {
635 case 'T': case 't':
636 *result = n * G * K;
637 // Check for overflow.
638 if (*result/((julong)G * K) != n) return false;
639 return true;
640 case 'G': case 'g':
641 *result = n * G;
642 if (*result/G != n) return false;
643 return true;
644 case 'M': case 'm':
645 *result = n * M;
646 if (*result/M != n) return false;
647 return true;
648 case 'K': case 'k':
649 *result = n * K;
650 if (*result/K != n) return false;
651 return true;
652 case '\0':
653 *result = n;
654 return true;
655 default:
656 return false;
657 }
658 }
659
660 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
661 if (size < min_size) return arg_too_small;
662 // Check that size will fit in a size_t (only relevant on 32-bit)
663 if (size > max_uintx) return arg_too_big;
664 return arg_in_range;
665 }
666
667 // Describe an argument out of range error
668 void Arguments::describe_range_error(ArgsRange errcode) {
669 switch(errcode) {
670 case arg_too_big:
671 jio_fprintf(defaultStream::error_stream(),
672 "The specified size exceeds the maximum "
673 "representable size.\n");
674 break;
675 case arg_too_small:
676 case arg_unreadable:
677 case arg_in_range:
678 // do nothing for now
679 break;
680 default:
681 ShouldNotReachHere();
682 }
683 }
684
685 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
686 return CommandLineFlags::boolAtPut(name, &value, origin);
687 }
688
689 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
690 double v;
691 if (sscanf(value, "%lf", &v) != 1) {
692 return false;
693 }
694
695 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
696 return true;
697 }
698 return false;
699 }
700
701 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
702 julong v;
703 intx intx_v;
704 bool is_neg = false;
705 // Check the sign first since atomull() parses only unsigned values.
706 if (*value == '-') {
707 if (!CommandLineFlags::intxAt(name, &intx_v)) {
708 return false;
709 }
710 value++;
711 is_neg = true;
712 }
713 if (!atomull(value, &v)) {
714 return false;
715 }
716 intx_v = (intx) v;
717 if (is_neg) {
718 intx_v = -intx_v;
719 }
720 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
721 return true;
722 }
723 uintx uintx_v = (uintx) v;
724 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
725 return true;
726 }
727 uint64_t uint64_t_v = (uint64_t) v;
728 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
729 return true;
730 }
731 size_t size_t_v = (size_t) v;
732 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
733 return true;
734 }
735 return false;
736 }
737
738 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
739 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
740 // Contract: CommandLineFlags always returns a pointer that needs freeing.
741 FREE_C_HEAP_ARRAY(char, value, mtInternal);
742 return true;
743 }
744
745 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
746 const char* old_value = "";
747 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
748 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
749 size_t new_len = strlen(new_value);
750 const char* value;
751 char* free_this_too = NULL;
752 if (old_len == 0) {
753 value = new_value;
754 } else if (new_len == 0) {
755 value = old_value;
756 } else {
757 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
758 // each new setting adds another LINE to the switch:
759 sprintf(buf, "%s\n%s", old_value, new_value);
760 value = buf;
761 free_this_too = buf;
762 }
763 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
764 // CommandLineFlags always returns a pointer that needs freeing.
765 FREE_C_HEAP_ARRAY(char, value, mtInternal);
766 if (free_this_too != NULL) {
767 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
768 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
769 }
770 return true;
771 }
772
773 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
774
775 // range of acceptable characters spelled out for portability reasons
776 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
777 #define BUFLEN 255
778 char name[BUFLEN+1];
779 char dummy;
780
781 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
782 return set_bool_flag(name, false, origin);
783 }
784 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
785 return set_bool_flag(name, true, origin);
786 }
787
788 char punct;
789 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
790 const char* value = strchr(arg, '=') + 1;
791 Flag* flag = Flag::find_flag(name, strlen(name));
792 if (flag != NULL && flag->is_ccstr()) {
793 if (flag->ccstr_accumulates()) {
794 return append_to_string_flag(name, value, origin);
795 } else {
796 if (value[0] == '\0') {
797 value = NULL;
798 }
799 return set_string_flag(name, value, origin);
800 }
801 }
802 }
803
804 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
805 const char* value = strchr(arg, '=') + 1;
806 // -XX:Foo:=xxx will reset the string flag to the given value.
807 if (value[0] == '\0') {
808 value = NULL;
809 }
810 return set_string_flag(name, value, origin);
811 }
812
813 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
814 #define SIGNED_NUMBER_RANGE "[-0123456789]"
815 #define NUMBER_RANGE "[0123456789]"
816 char value[BUFLEN + 1];
817 char value2[BUFLEN + 1];
818 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
819 // Looks like a floating-point number -- try again with more lenient format string
820 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
821 return set_fp_numeric_flag(name, value, origin);
822 }
823 }
824
825 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
826 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
827 return set_numeric_flag(name, value, origin);
828 }
829
830 return false;
831 }
832
833 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
834 assert(bldarray != NULL, "illegal argument");
835
836 if (arg == NULL) {
837 return;
838 }
839
840 int new_count = *count + 1;
841
842 // expand the array and add arg to the last element
843 if (*bldarray == NULL) {
844 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
845 } else {
846 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
847 }
848 (*bldarray)[*count] = os::strdup_check_oom(arg);
849 *count = new_count;
850 }
851
852 void Arguments::build_jvm_args(const char* arg) {
853 add_string(&_jvm_args_array, &_num_jvm_args, arg);
854 }
855
856 void Arguments::build_jvm_flags(const char* arg) {
857 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
858 }
859
860 // utility function to return a string that concatenates all
861 // strings in a given char** array
862 const char* Arguments::build_resource_string(char** args, int count) {
863 if (args == NULL || count == 0) {
864 return NULL;
865 }
866 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
867 for (int i = 1; i < count; i++) {
868 length += strlen(args[i]) + 1; // add 1 for a space
869 }
870 char* s = NEW_RESOURCE_ARRAY(char, length);
871 strcpy(s, args[0]);
872 for (int j = 1; j < count; j++) {
873 strcat(s, " ");
874 strcat(s, args[j]);
875 }
876 return (const char*) s;
877 }
878
879 void Arguments::print_on(outputStream* st) {
880 st->print_cr("VM Arguments:");
881 if (num_jvm_flags() > 0) {
882 st->print("jvm_flags: "); print_jvm_flags_on(st);
883 }
884 if (num_jvm_args() > 0) {
885 st->print("jvm_args: "); print_jvm_args_on(st);
886 }
887 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
888 if (_java_class_path != NULL) {
889 char* path = _java_class_path->value();
890 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
891 }
892 st->print_cr("Launcher Type: %s", _sun_java_launcher);
893 }
894
895 void Arguments::print_jvm_flags_on(outputStream* st) {
896 if (_num_jvm_flags > 0) {
897 for (int i=0; i < _num_jvm_flags; i++) {
898 st->print("%s ", _jvm_flags_array[i]);
899 }
900 st->cr();
901 }
902 }
903
904 void Arguments::print_jvm_args_on(outputStream* st) {
905 if (_num_jvm_args > 0) {
906 for (int i=0; i < _num_jvm_args; i++) {
907 st->print("%s ", _jvm_args_array[i]);
908 }
909 st->cr();
910 }
911 }
912
913 bool Arguments::process_argument(const char* arg,
914 jboolean ignore_unrecognized, Flag::Flags origin) {
915
916 JDK_Version since = JDK_Version();
917
918 if (parse_argument(arg, origin) || ignore_unrecognized) {
919 return true;
920 }
921
922 bool has_plus_minus = (*arg == '+' || *arg == '-');
923 const char* const argname = has_plus_minus ? arg + 1 : arg;
924 if (is_newly_obsolete(arg, &since)) {
925 char version[256];
926 since.to_string(version, sizeof(version));
927 warning("ignoring option %s; support was removed in %s", argname, version);
928 return true;
929 }
930
931 // For locked flags, report a custom error message if available.
932 // Otherwise, report the standard unrecognized VM option.
933
934 size_t arg_len;
935 const char* equal_sign = strchr(argname, '=');
936 if (equal_sign == NULL) {
937 arg_len = strlen(argname);
938 } else {
939 arg_len = equal_sign - argname;
940 }
941
942 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
943 if (found_flag != NULL) {
944 char locked_message_buf[BUFLEN];
945 found_flag->get_locked_message(locked_message_buf, BUFLEN);
946 if (strlen(locked_message_buf) == 0) {
947 if (found_flag->is_bool() && !has_plus_minus) {
948 jio_fprintf(defaultStream::error_stream(),
949 "Missing +/- setting for VM option '%s'\n", argname);
950 } else if (!found_flag->is_bool() && has_plus_minus) {
951 jio_fprintf(defaultStream::error_stream(),
952 "Unexpected +/- setting in VM option '%s'\n", argname);
953 } else {
954 jio_fprintf(defaultStream::error_stream(),
955 "Improperly specified VM option '%s'\n", argname);
956 }
957 } else {
958 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
959 }
960 } else {
961 jio_fprintf(defaultStream::error_stream(),
962 "Unrecognized VM option '%s'\n", argname);
963 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
964 if (fuzzy_matched != NULL) {
965 jio_fprintf(defaultStream::error_stream(),
966 "Did you mean '%s%s%s'? ",
967 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
968 fuzzy_matched->_name,
969 (fuzzy_matched->is_bool()) ? "" : "=<value>");
970 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
971 char version[256];
972 since.to_string(version, sizeof(version));
973 jio_fprintf(defaultStream::error_stream(),
974 "Warning: support for %s was removed in %s\n",
975 fuzzy_matched->_name,
976 version);
977 }
978 }
979 }
980
981 // allow for commandline "commenting out" options like -XX:#+Verbose
982 return arg[0] == '#';
983 }
984
985 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
986 FILE* stream = fopen(file_name, "rb");
987 if (stream == NULL) {
988 if (should_exist) {
989 jio_fprintf(defaultStream::error_stream(),
990 "Could not open settings file %s\n", file_name);
991 return false;
992 } else {
993 return true;
994 }
995 }
996
997 char token[1024];
998 int pos = 0;
999
1000 bool in_white_space = true;
1001 bool in_comment = false;
1002 bool in_quote = false;
1003 char quote_c = 0;
1004 bool result = true;
1005
1006 int c = getc(stream);
1007 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1008 if (in_white_space) {
1009 if (in_comment) {
1010 if (c == '\n') in_comment = false;
1011 } else {
1012 if (c == '#') in_comment = true;
1013 else if (!isspace(c)) {
1014 in_white_space = false;
1015 token[pos++] = c;
1016 }
1017 }
1018 } else {
1019 if (c == '\n' || (!in_quote && isspace(c))) {
1020 // token ends at newline, or at unquoted whitespace
1021 // this allows a way to include spaces in string-valued options
1022 token[pos] = '\0';
1023 logOption(token);
1024 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1025 build_jvm_flags(token);
1026 pos = 0;
1027 in_white_space = true;
1028 in_quote = false;
1029 } else if (!in_quote && (c == '\'' || c == '"')) {
1030 in_quote = true;
1031 quote_c = c;
1032 } else if (in_quote && (c == quote_c)) {
1033 in_quote = false;
1034 } else {
1035 token[pos++] = c;
1036 }
1037 }
1038 c = getc(stream);
1039 }
1040 if (pos > 0) {
1041 token[pos] = '\0';
1042 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1043 build_jvm_flags(token);
1044 }
1045 fclose(stream);
1046 return result;
1047 }
1048
1049 //=============================================================================================================
1050 // Parsing of properties (-D)
1051
1052 const char* Arguments::get_property(const char* key) {
1053 return PropertyList_get_value(system_properties(), key);
1054 }
1055
1056 bool Arguments::add_property(const char* prop) {
1057 const char* eq = strchr(prop, '=');
1058 char* key;
1059 // ns must be static--its address may be stored in a SystemProperty object.
1060 const static char ns[1] = {0};
1061 char* value = (char *)ns;
1062
1063 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1064 key = AllocateHeap(key_len + 1, mtInternal);
1065 strncpy(key, prop, key_len);
1066 key[key_len] = '\0';
1067
1068 if (eq != NULL) {
1069 size_t value_len = strlen(prop) - key_len - 1;
1070 value = AllocateHeap(value_len + 1, mtInternal);
1071 strncpy(value, &prop[key_len + 1], value_len + 1);
1072 }
1073
1074 if (strcmp(key, "java.compiler") == 0) {
1075 process_java_compiler_argument(value);
1076 FreeHeap(key);
1077 if (eq != NULL) {
1078 FreeHeap(value);
1079 }
1080 return true;
1081 } else if (strcmp(key, "sun.java.command") == 0) {
1082 _java_command = value;
1083
1084 // Record value in Arguments, but let it get passed to Java.
1085 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1086 strcmp(key, "sun.java.launcher.pid") == 0) {
1087 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1088 // private and are processed in process_sun_java_launcher_properties();
1089 // the sun.java.launcher property is passed on to the java application
1090 FreeHeap(key);
1091 if (eq != NULL) {
1092 FreeHeap(value);
1093 }
1094 return true;
1095 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1096 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1097 // its value without going through the property list or making a Java call.
1098 _java_vendor_url_bug = value;
1099 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1100 PropertyList_unique_add(&_system_properties, key, value, true);
1101 return true;
1102 }
1103 // Create new property and add at the end of the list
1104 PropertyList_unique_add(&_system_properties, key, value);
1105 return true;
1106 }
1107
1108 //===========================================================================================================
1109 // Setting int/mixed/comp mode flags
1110
1111 void Arguments::set_mode_flags(Mode mode) {
1112 // Set up default values for all flags.
1113 // If you add a flag to any of the branches below,
1114 // add a default value for it here.
1115 set_java_compiler(false);
1116 _mode = mode;
1117
1118 // Ensure Agent_OnLoad has the correct initial values.
1119 // This may not be the final mode; mode may change later in onload phase.
1120 PropertyList_unique_add(&_system_properties, "java.vm.info",
1121 (char*)VM_Version::vm_info_string(), false);
1122
1123 UseInterpreter = true;
1124 UseCompiler = true;
1125 UseLoopCounter = true;
1126
1127 // Default values may be platform/compiler dependent -
1128 // use the saved values
1129 ClipInlining = Arguments::_ClipInlining;
1130 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1131 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1132 BackgroundCompilation = Arguments::_BackgroundCompilation;
1133
1134 // Change from defaults based on mode
1135 switch (mode) {
1136 default:
1137 ShouldNotReachHere();
1138 break;
1139 case _int:
1140 UseCompiler = false;
1141 UseLoopCounter = false;
1142 AlwaysCompileLoopMethods = false;
1143 UseOnStackReplacement = false;
1144 break;
1145 case _mixed:
1146 // same as default
1147 break;
1148 case _comp:
1149 UseInterpreter = false;
1150 BackgroundCompilation = false;
1151 ClipInlining = false;
1152 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1153 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1154 // compile a level 4 (C2) and then continue executing it.
1155 if (TieredCompilation) {
1156 Tier3InvokeNotifyFreqLog = 0;
1157 Tier4InvocationThreshold = 0;
1158 }
1159 break;
1160 }
1161 }
1162
1163 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1164 // Conflict: required to use shared spaces (-Xshare:on), but
1165 // incompatible command line options were chosen.
1166
1167 static void no_shared_spaces(const char* message) {
1168 if (RequireSharedSpaces) {
1169 jio_fprintf(defaultStream::error_stream(),
1170 "Class data sharing is inconsistent with other specified options.\n");
1171 vm_exit_during_initialization("Unable to use shared archive.", message);
1172 } else {
1173 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1174 }
1175 }
1176 #endif
1177
1178 // Returns threshold scaled with CompileThresholdScaling
1179 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1180 return (intx)(threshold * CompileThresholdScaling);
1181 }
1182
1183 // Returns freq_log scaled with CompileThresholdScaling
1184 intx Arguments::get_scaled_freq_log(intx freq_log) {
1185 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1186 if (scaled_freq == 0) {
1187 return 0;
1188 } else {
1189 return log2_intptr(scaled_freq);
1190 }
1191 }
1192
1193 void Arguments::set_tiered_flags() {
1194 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1195 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1196 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1197 }
1198 if (CompilationPolicyChoice < 2) {
1199 vm_exit_during_initialization(
1200 "Incompatible compilation policy selected", NULL);
1201 }
1202 // Increase the code cache size - tiered compiles a lot more.
1203 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1204 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1205 }
1206 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1207 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1208 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1209
1210 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1211 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1212 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1213 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1214 }
1215 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1216 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1217 }
1218 // Check consistency of code heap sizes
1219 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1220 jio_fprintf(defaultStream::error_stream(),
1221 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1222 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1223 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1224 vm_exit(1);
1225 }
1226 }
1227 }
1228 if (!UseInterpreter) { // -Xcomp
1229 Tier3InvokeNotifyFreqLog = 0;
1230 Tier4InvocationThreshold = 0;
1231 }
1232 // Scale tiered compilation thresholds
1233 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1234 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1235 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1236
1237 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1238 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1239 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1240 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1241
1242 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1243 // once these thresholds become supported.
1244
1245 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1246 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1247
1248 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1249 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1250
1251 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1252
1253 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1254 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1255 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1256 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1257 }
1258 }
1259
1260 /**
1261 * Returns the minimum number of compiler threads needed to run the JVM. The following
1262 * configurations are possible.
1263 *
1264 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1265 * compiler threads is 0.
1266 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1267 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1268 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1269 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1270 * C1 can be used, so the minimum number of compiler threads is 1.
1271 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1272 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1273 * the minimum number of compiler threads is 2.
1274 */
1275 int Arguments::get_min_number_of_compiler_threads() {
1276 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1277 return 0; // case 1
1278 #else
1279 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1280 return 1; // case 2 or case 3
1281 }
1282 return 2; // case 4 (tiered)
1283 #endif
1284 }
1285
1286 #if INCLUDE_ALL_GCS
1287 static void disable_adaptive_size_policy(const char* collector_name) {
1288 if (UseAdaptiveSizePolicy) {
1289 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1290 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1291 collector_name);
1292 }
1293 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1294 }
1295 }
1296
1297 void Arguments::set_parnew_gc_flags() {
1298 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1299 "control point invariant");
1300 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1301 assert(UseParNewGC, "ParNew should always be used with CMS");
1302
1303 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1304 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1305 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1306 } else if (ParallelGCThreads == 0) {
1307 jio_fprintf(defaultStream::error_stream(),
1308 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1309 vm_exit(1);
1310 }
1311
1312 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1313 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1314 // we set them to 1024 and 1024.
1315 // See CR 6362902.
1316 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1317 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1318 }
1319 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1320 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1321 }
1322
1323 // When using compressed oops, we use local overflow stacks,
1324 // rather than using a global overflow list chained through
1325 // the klass word of the object's pre-image.
1326 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1327 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1328 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1329 }
1330 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1331 }
1332 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1333 }
1334
1335 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1336 // sparc/solaris for certain applications, but would gain from
1337 // further optimization and tuning efforts, and would almost
1338 // certainly gain from analysis of platform and environment.
1339 void Arguments::set_cms_and_parnew_gc_flags() {
1340 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1341 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1342 assert(UseParNewGC, "ParNew should always be used with CMS");
1343
1344 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1345 disable_adaptive_size_policy("UseConcMarkSweepGC");
1346
1347 set_parnew_gc_flags();
1348
1349 size_t max_heap = align_size_down(MaxHeapSize,
1350 CardTableRS::ct_max_alignment_constraint());
1351
1352 // Now make adjustments for CMS
1353 intx tenuring_default = (intx)6;
1354 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1355
1356 // Preferred young gen size for "short" pauses:
1357 // upper bound depends on # of threads and NewRatio.
1358 const uintx parallel_gc_threads =
1359 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1360 const size_t preferred_max_new_size_unaligned =
1361 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1362 size_t preferred_max_new_size =
1363 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1364
1365 // Unless explicitly requested otherwise, size young gen
1366 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1367
1368 // If either MaxNewSize or NewRatio is set on the command line,
1369 // assume the user is trying to set the size of the young gen.
1370 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1371
1372 // Set MaxNewSize to our calculated preferred_max_new_size unless
1373 // NewSize was set on the command line and it is larger than
1374 // preferred_max_new_size.
1375 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1376 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1377 } else {
1378 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1379 }
1380 if (PrintGCDetails && Verbose) {
1381 // Too early to use gclog_or_tty
1382 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1383 }
1384
1385 // Code along this path potentially sets NewSize and OldSize
1386 if (PrintGCDetails && Verbose) {
1387 // Too early to use gclog_or_tty
1388 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1389 " initial_heap_size: " SIZE_FORMAT
1390 " max_heap: " SIZE_FORMAT,
1391 min_heap_size(), InitialHeapSize, max_heap);
1392 }
1393 size_t min_new = preferred_max_new_size;
1394 if (FLAG_IS_CMDLINE(NewSize)) {
1395 min_new = NewSize;
1396 }
1397 if (max_heap > min_new && min_heap_size() > min_new) {
1398 // Unless explicitly requested otherwise, make young gen
1399 // at least min_new, and at most preferred_max_new_size.
1400 if (FLAG_IS_DEFAULT(NewSize)) {
1401 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1402 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1403 if (PrintGCDetails && Verbose) {
1404 // Too early to use gclog_or_tty
1405 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1406 }
1407 }
1408 // Unless explicitly requested otherwise, size old gen
1409 // so it's NewRatio x of NewSize.
1410 if (FLAG_IS_DEFAULT(OldSize)) {
1411 if (max_heap > NewSize) {
1412 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1413 if (PrintGCDetails && Verbose) {
1414 // Too early to use gclog_or_tty
1415 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1416 }
1417 }
1418 }
1419 }
1420 }
1421 // Unless explicitly requested otherwise, definitely
1422 // promote all objects surviving "tenuring_default" scavenges.
1423 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1424 FLAG_IS_DEFAULT(SurvivorRatio)) {
1425 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1426 }
1427 // If we decided above (or user explicitly requested)
1428 // `promote all' (via MaxTenuringThreshold := 0),
1429 // prefer minuscule survivor spaces so as not to waste
1430 // space for (non-existent) survivors
1431 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1432 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1433 }
1434 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1435 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1436 // This is done in order to make ParNew+CMS configuration to work
1437 // with YoungPLABSize and OldPLABSize options.
1438 // See CR 6362902.
1439 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1440 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1441 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1442 // is. In this situation let CMSParPromoteBlocksToClaim follow
1443 // the value (either from the command line or ergonomics) of
1444 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1445 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1446 } else {
1447 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1448 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1449 // we'll let it to take precedence.
1450 jio_fprintf(defaultStream::error_stream(),
1451 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1452 " options are specified for the CMS collector."
1453 " CMSParPromoteBlocksToClaim will take precedence.\n");
1454 }
1455 }
1456 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1457 // OldPLAB sizing manually turned off: Use a larger default setting,
1458 // unless it was manually specified. This is because a too-low value
1459 // will slow down scavenges.
1460 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1461 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1462 }
1463 }
1464 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1465 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1466 // If either of the static initialization defaults have changed, note this
1467 // modification.
1468 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1469 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1470 }
1471 if (PrintGCDetails && Verbose) {
1472 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1473 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1474 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1475 }
1476 }
1477 #endif // INCLUDE_ALL_GCS
1478
1479 void set_object_alignment() {
1480 // Object alignment.
1481 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1482 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1483 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1484 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1485 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1486 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1487
1488 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1489 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1490
1491 // Oop encoding heap max
1492 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1493
1494 #if INCLUDE_ALL_GCS
1495 // Set CMS global values
1496 CompactibleFreeListSpace::set_cms_values();
1497 #endif // INCLUDE_ALL_GCS
1498 }
1499
1500 bool verify_object_alignment() {
1501 // Object alignment.
1502 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1503 jio_fprintf(defaultStream::error_stream(),
1504 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1505 (int)ObjectAlignmentInBytes);
1506 return false;
1507 }
1508 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1509 jio_fprintf(defaultStream::error_stream(),
1510 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1511 (int)ObjectAlignmentInBytes, BytesPerLong);
1512 return false;
1513 }
1514 // It does not make sense to have big object alignment
1515 // since a space lost due to alignment will be greater
1516 // then a saved space from compressed oops.
1517 if ((int)ObjectAlignmentInBytes > 256) {
1518 jio_fprintf(defaultStream::error_stream(),
1519 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1520 (int)ObjectAlignmentInBytes);
1521 return false;
1522 }
1523 // In case page size is very small.
1524 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1525 jio_fprintf(defaultStream::error_stream(),
1526 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1527 (int)ObjectAlignmentInBytes, os::vm_page_size());
1528 return false;
1529 }
1530 if(SurvivorAlignmentInBytes == 0) {
1531 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1532 } else {
1533 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1534 jio_fprintf(defaultStream::error_stream(),
1535 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1536 (int)SurvivorAlignmentInBytes);
1537 return false;
1538 }
1539 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1540 jio_fprintf(defaultStream::error_stream(),
1541 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1542 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1543 return false;
1544 }
1545 }
1546 return true;
1547 }
1548
1549 size_t Arguments::max_heap_for_compressed_oops() {
1550 // Avoid sign flip.
1551 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1552 // We need to fit both the NULL page and the heap into the memory budget, while
1553 // keeping alignment constraints of the heap. To guarantee the latter, as the
1554 // NULL page is located before the heap, we pad the NULL page to the conservative
1555 // maximum alignment that the GC may ever impose upon the heap.
1556 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1557 _conservative_max_heap_alignment);
1558
1559 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1560 NOT_LP64(ShouldNotReachHere(); return 0);
1561 }
1562
1563 bool Arguments::should_auto_select_low_pause_collector() {
1564 if (UseAutoGCSelectPolicy &&
1565 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1566 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1567 if (PrintGCDetails) {
1568 // Cannot use gclog_or_tty yet.
1569 tty->print_cr("Automatic selection of the low pause collector"
1570 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1571 }
1572 return true;
1573 }
1574 return false;
1575 }
1576
1577 void Arguments::set_use_compressed_oops() {
1578 #ifndef ZERO
1579 #ifdef _LP64
1580 // MaxHeapSize is not set up properly at this point, but
1581 // the only value that can override MaxHeapSize if we are
1582 // to use UseCompressedOops is InitialHeapSize.
1583 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1584
1585 if (max_heap_size <= max_heap_for_compressed_oops()) {
1586 #if !defined(COMPILER1) || defined(TIERED)
1587 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1588 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1589 }
1590 #endif
1591 #ifdef _WIN64
1592 if (UseLargePages && UseCompressedOops) {
1593 // Cannot allocate guard pages for implicit checks in indexed addressing
1594 // mode, when large pages are specified on windows.
1595 // This flag could be switched ON if narrow oop base address is set to 0,
1596 // see code in Universe::initialize_heap().
1597 Universe::set_narrow_oop_use_implicit_null_checks(false);
1598 }
1599 #endif // _WIN64
1600 } else {
1601 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1602 warning("Max heap size too large for Compressed Oops");
1603 FLAG_SET_DEFAULT(UseCompressedOops, false);
1604 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1605 }
1606 }
1607 #endif // _LP64
1608 #endif // ZERO
1609 }
1610
1611
1612 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1613 // set_use_compressed_oops().
1614 void Arguments::set_use_compressed_klass_ptrs() {
1615 #ifndef ZERO
1616 #ifdef _LP64
1617 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1618 if (!UseCompressedOops) {
1619 if (UseCompressedClassPointers) {
1620 warning("UseCompressedClassPointers requires UseCompressedOops");
1621 }
1622 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1623 } else {
1624 // Turn on UseCompressedClassPointers too
1625 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1626 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1627 }
1628 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1629 if (UseCompressedClassPointers) {
1630 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1631 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1632 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1633 }
1634 }
1635 }
1636 #endif // _LP64
1637 #endif // !ZERO
1638 }
1639
1640 void Arguments::set_conservative_max_heap_alignment() {
1641 // The conservative maximum required alignment for the heap is the maximum of
1642 // the alignments imposed by several sources: any requirements from the heap
1643 // itself, the collector policy and the maximum page size we may run the VM
1644 // with.
1645 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1646 #if INCLUDE_ALL_GCS
1647 if (UseParallelGC) {
1648 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1649 } else if (UseG1GC) {
1650 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1651 }
1652 #endif // INCLUDE_ALL_GCS
1653 _conservative_max_heap_alignment = MAX4(heap_alignment,
1654 (size_t)os::vm_allocation_granularity(),
1655 os::max_page_size(),
1656 CollectorPolicy::compute_heap_alignment());
1657 }
1658
1659 void Arguments::select_gc_ergonomically() {
1660 if (os::is_server_class_machine()) {
1661 if (should_auto_select_low_pause_collector()) {
1662 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1663 } else {
1664 FLAG_SET_ERGO(bool, UseParallelGC, true);
1665 }
1666 }
1667 }
1668
1669 void Arguments::select_gc() {
1670 if (!gc_selected()) {
1671 ArgumentsExt::select_gc_ergonomically();
1672 }
1673 }
1674
1675 void Arguments::set_ergonomics_flags() {
1676 select_gc();
1677
1678 #ifdef COMPILER2
1679 // Shared spaces work fine with other GCs but causes bytecode rewriting
1680 // to be disabled, which hurts interpreter performance and decreases
1681 // server performance. When -server is specified, keep the default off
1682 // unless it is asked for. Future work: either add bytecode rewriting
1683 // at link time, or rewrite bytecodes in non-shared methods.
1684 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1685 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1686 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1687 }
1688 #endif
1689
1690 set_conservative_max_heap_alignment();
1691
1692 #ifndef ZERO
1693 #ifdef _LP64
1694 set_use_compressed_oops();
1695
1696 // set_use_compressed_klass_ptrs() must be called after calling
1697 // set_use_compressed_oops().
1698 set_use_compressed_klass_ptrs();
1699
1700 // Also checks that certain machines are slower with compressed oops
1701 // in vm_version initialization code.
1702 #endif // _LP64
1703 #endif // !ZERO
1704 }
1705
1706 void Arguments::set_parallel_gc_flags() {
1707 assert(UseParallelGC || UseParallelOldGC, "Error");
1708 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1709 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1710 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1711 }
1712 FLAG_SET_DEFAULT(UseParallelGC, true);
1713
1714 // If no heap maximum was requested explicitly, use some reasonable fraction
1715 // of the physical memory, up to a maximum of 1GB.
1716 FLAG_SET_DEFAULT(ParallelGCThreads,
1717 Abstract_VM_Version::parallel_worker_threads());
1718 if (ParallelGCThreads == 0) {
1719 jio_fprintf(defaultStream::error_stream(),
1720 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1721 vm_exit(1);
1722 }
1723
1724 if (UseAdaptiveSizePolicy) {
1725 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1726 // unless the user actually sets these flags.
1727 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1728 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1729 _min_heap_free_ratio = MinHeapFreeRatio;
1730 }
1731 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1732 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1733 _max_heap_free_ratio = MaxHeapFreeRatio;
1734 }
1735 }
1736
1737 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1738 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1739 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1740 // See CR 6362902 for details.
1741 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1742 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1743 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1744 }
1745 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1746 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1747 }
1748 }
1749
1750 if (UseParallelOldGC) {
1751 // Par compact uses lower default values since they are treated as
1752 // minimums. These are different defaults because of the different
1753 // interpretation and are not ergonomically set.
1754 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1755 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1756 }
1757 }
1758 }
1759
1760 void Arguments::set_g1_gc_flags() {
1761 assert(UseG1GC, "Error");
1762 #ifdef COMPILER1
1763 FastTLABRefill = false;
1764 #endif
1765 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1766 if (ParallelGCThreads == 0) {
1767 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1768 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1769 }
1770
1771 #if INCLUDE_ALL_GCS
1772 if (G1ConcRefinementThreads == 0) {
1773 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1774 }
1775 #endif
1776
1777 // MarkStackSize will be set (if it hasn't been set by the user)
1778 // when concurrent marking is initialized.
1779 // Its value will be based upon the number of parallel marking threads.
1780 // But we do set the maximum mark stack size here.
1781 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1782 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1783 }
1784
1785 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1786 // In G1, we want the default GC overhead goal to be higher than
1787 // say in PS. So we set it here to 10%. Otherwise the heap might
1788 // be expanded more aggressively than we would like it to. In
1789 // fact, even 10% seems to not be high enough in some cases
1790 // (especially small GC stress tests that the main thing they do
1791 // is allocation). We might consider increase it further.
1792 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1793 }
1794
1795 if (PrintGCDetails && Verbose) {
1796 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1797 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1798 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1799 }
1800 }
1801
1802 #if !INCLUDE_ALL_GCS
1803 #ifdef ASSERT
1804 static bool verify_serial_gc_flags() {
1805 return (UseSerialGC &&
1806 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1807 UseParallelGC || UseParallelOldGC));
1808 }
1809 #endif // ASSERT
1810 #endif // INCLUDE_ALL_GCS
1811
1812 void Arguments::set_gc_specific_flags() {
1813 #if INCLUDE_ALL_GCS
1814 // Set per-collector flags
1815 if (UseParallelGC || UseParallelOldGC) {
1816 set_parallel_gc_flags();
1817 } else if (UseConcMarkSweepGC) {
1818 set_cms_and_parnew_gc_flags();
1819 } else if (UseG1GC) {
1820 set_g1_gc_flags();
1821 }
1822 check_deprecated_gc_flags();
1823 if (AssumeMP && !UseSerialGC) {
1824 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1825 warning("If the number of processors is expected to increase from one, then"
1826 " you should configure the number of parallel GC threads appropriately"
1827 " using -XX:ParallelGCThreads=N");
1828 }
1829 }
1830 if (MinHeapFreeRatio == 100) {
1831 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1832 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1833 }
1834 #else // INCLUDE_ALL_GCS
1835 assert(verify_serial_gc_flags(), "SerialGC unset");
1836 #endif // INCLUDE_ALL_GCS
1837 }
1838
1839 julong Arguments::limit_by_allocatable_memory(julong limit) {
1840 julong max_allocatable;
1841 julong result = limit;
1842 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1843 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1844 }
1845 return result;
1846 }
1847
1848 // Use static initialization to get the default before parsing
1849 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1850
1851 void Arguments::set_heap_size() {
1852 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1853 // Deprecated flag
1854 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1855 }
1856
1857 const julong phys_mem =
1858 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1859 : (julong)MaxRAM;
1860
1861 // If the maximum heap size has not been set with -Xmx,
1862 // then set it as fraction of the size of physical memory,
1863 // respecting the maximum and minimum sizes of the heap.
1864 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1865 julong reasonable_max = phys_mem / MaxRAMFraction;
1866
1867 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1868 // Small physical memory, so use a minimum fraction of it for the heap
1869 reasonable_max = phys_mem / MinRAMFraction;
1870 } else {
1871 // Not-small physical memory, so require a heap at least
1872 // as large as MaxHeapSize
1873 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1874 }
1875 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1876 // Limit the heap size to ErgoHeapSizeLimit
1877 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1878 }
1879 if (UseCompressedOops) {
1880 // Limit the heap size to the maximum possible when using compressed oops
1881 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1882
1883 // HeapBaseMinAddress can be greater than default but not less than.
1884 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1885 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1886 // matches compressed oops printing flags
1887 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1888 jio_fprintf(defaultStream::error_stream(),
1889 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1890 " (" UINTX_FORMAT "G) which is greater than value given "
1891 UINTX_FORMAT "\n",
1892 DefaultHeapBaseMinAddress,
1893 DefaultHeapBaseMinAddress/G,
1894 HeapBaseMinAddress);
1895 }
1896 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1897 }
1898 }
1899
1900 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1901 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1902 // but it should be not less than default MaxHeapSize.
1903 max_coop_heap -= HeapBaseMinAddress;
1904 }
1905 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1906 }
1907 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1908
1909 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1910 // An initial heap size was specified on the command line,
1911 // so be sure that the maximum size is consistent. Done
1912 // after call to limit_by_allocatable_memory because that
1913 // method might reduce the allocation size.
1914 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1915 }
1916
1917 if (PrintGCDetails && Verbose) {
1918 // Cannot use gclog_or_tty yet.
1919 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1920 }
1921 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1922 }
1923
1924 // If the minimum or initial heap_size have not been set or requested to be set
1925 // ergonomically, set them accordingly.
1926 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1927 julong reasonable_minimum = (julong)(OldSize + NewSize);
1928
1929 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1930
1931 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1932
1933 if (InitialHeapSize == 0) {
1934 julong reasonable_initial = phys_mem / InitialRAMFraction;
1935
1936 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1937 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1938
1939 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1940
1941 if (PrintGCDetails && Verbose) {
1942 // Cannot use gclog_or_tty yet.
1943 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1944 }
1945 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1946 }
1947 // If the minimum heap size has not been set (via -Xms),
1948 // synchronize with InitialHeapSize to avoid errors with the default value.
1949 if (min_heap_size() == 0) {
1950 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1951 if (PrintGCDetails && Verbose) {
1952 // Cannot use gclog_or_tty yet.
1953 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1954 }
1955 }
1956 }
1957 }
1958
1959 // This must be called after ergonomics because we want bytecode rewriting
1960 // if the server compiler is used, or if UseSharedSpaces is disabled.
1961 void Arguments::set_bytecode_flags() {
1962 // Better not attempt to store into a read-only space.
1963 if (UseSharedSpaces) {
1964 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1965 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1966 }
1967
1968 if (!RewriteBytecodes) {
1969 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1970 }
1971 }
1972
1973 // Aggressive optimization flags -XX:+AggressiveOpts
1974 void Arguments::set_aggressive_opts_flags() {
1975 #ifdef COMPILER2
1976 if (AggressiveUnboxing) {
1977 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1978 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1979 } else if (!EliminateAutoBox) {
1980 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1981 AggressiveUnboxing = false;
1982 }
1983 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1984 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1985 } else if (!DoEscapeAnalysis) {
1986 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1987 AggressiveUnboxing = false;
1988 }
1989 }
1990 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1991 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1992 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1993 }
1994 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1995 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1996 }
1997
1998 // Feed the cache size setting into the JDK
1999 char buffer[1024];
2000 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2001 add_property(buffer);
2002 }
2003 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2004 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2005 }
2006 #endif
2007
2008 if (AggressiveOpts) {
2009 // Sample flag setting code
2010 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2011 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2012 // }
2013 }
2014 }
2015
2016 //===========================================================================================================
2017 // Parsing of java.compiler property
2018
2019 void Arguments::process_java_compiler_argument(char* arg) {
2020 // For backwards compatibility, Djava.compiler=NONE or ""
2021 // causes us to switch to -Xint mode UNLESS -Xdebug
2022 // is also specified.
2023 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2024 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2025 }
2026 }
2027
2028 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2029 _sun_java_launcher = os::strdup_check_oom(launcher);
2030 }
2031
2032 bool Arguments::created_by_java_launcher() {
2033 assert(_sun_java_launcher != NULL, "property must have value");
2034 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2035 }
2036
2037 bool Arguments::sun_java_launcher_is_altjvm() {
2038 return _sun_java_launcher_is_altjvm;
2039 }
2040
2041 //===========================================================================================================
2042 // Parsing of main arguments
2043
2044 bool Arguments::verify_interval(uintx val, uintx min,
2045 uintx max, const char* name) {
2046 // Returns true iff value is in the inclusive interval [min..max]
2047 // false, otherwise.
2048 if (val >= min && val <= max) {
2049 return true;
2050 }
2051 jio_fprintf(defaultStream::error_stream(),
2052 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2053 " and " UINTX_FORMAT "\n",
2054 name, val, min, max);
2055 return false;
2056 }
2057
2058 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2059 // Returns true if given value is at least specified min threshold
2060 // false, otherwise.
2061 if (val >= min ) {
2062 return true;
2063 }
2064 jio_fprintf(defaultStream::error_stream(),
2065 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2066 name, val, min);
2067 return false;
2068 }
2069
2070 bool Arguments::verify_percentage(uintx value, const char* name) {
2071 if (is_percentage(value)) {
2072 return true;
2073 }
2074 jio_fprintf(defaultStream::error_stream(),
2075 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2076 name, value);
2077 return false;
2078 }
2079
2080 // check if do gclog rotation
2081 // +UseGCLogFileRotation is a must,
2082 // no gc log rotation when log file not supplied or
2083 // NumberOfGCLogFiles is 0
2084 void check_gclog_consistency() {
2085 if (UseGCLogFileRotation) {
2086 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2087 jio_fprintf(defaultStream::output_stream(),
2088 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2089 "where num_of_file > 0\n"
2090 "GC log rotation is turned off\n");
2091 UseGCLogFileRotation = false;
2092 }
2093 }
2094
2095 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2096 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2097 jio_fprintf(defaultStream::output_stream(),
2098 "GCLogFileSize changed to minimum 8K\n");
2099 }
2100 }
2101
2102 // This function is called for -Xloggc:<filename>, it can be used
2103 // to check if a given file name(or string) conforms to the following
2104 // specification:
2105 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2106 // %p and %t only allowed once. We only limit usage of filename not path
2107 bool is_filename_valid(const char *file_name) {
2108 const char* p = file_name;
2109 char file_sep = os::file_separator()[0];
2110 const char* cp;
2111 // skip prefix path
2112 for (cp = file_name; *cp != '\0'; cp++) {
2113 if (*cp == '/' || *cp == file_sep) {
2114 p = cp + 1;
2115 }
2116 }
2117
2118 int count_p = 0;
2119 int count_t = 0;
2120 while (*p != '\0') {
2121 if ((*p >= '0' && *p <= '9') ||
2122 (*p >= 'A' && *p <= 'Z') ||
2123 (*p >= 'a' && *p <= 'z') ||
2124 *p == '-' ||
2125 *p == '_' ||
2126 *p == '.') {
2127 p++;
2128 continue;
2129 }
2130 if (*p == '%') {
2131 if(*(p + 1) == 'p') {
2132 p += 2;
2133 count_p ++;
2134 continue;
2135 }
2136 if (*(p + 1) == 't') {
2137 p += 2;
2138 count_t ++;
2139 continue;
2140 }
2141 }
2142 return false;
2143 }
2144 return count_p < 2 && count_t < 2;
2145 }
2146
2147 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2148 if (!is_percentage(min_heap_free_ratio)) {
2149 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2150 return false;
2151 }
2152 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2153 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2154 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2155 MaxHeapFreeRatio);
2156 return false;
2157 }
2158 // This does not set the flag itself, but stores the value in a safe place for later usage.
2159 _min_heap_free_ratio = min_heap_free_ratio;
2160 return true;
2161 }
2162
2163 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2164 if (!is_percentage(max_heap_free_ratio)) {
2165 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2166 return false;
2167 }
2168 if (max_heap_free_ratio < MinHeapFreeRatio) {
2169 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2170 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2171 MinHeapFreeRatio);
2172 return false;
2173 }
2174 // This does not set the flag itself, but stores the value in a safe place for later usage.
2175 _max_heap_free_ratio = max_heap_free_ratio;
2176 return true;
2177 }
2178
2179 // Check consistency of GC selection
2180 bool Arguments::check_gc_consistency_user() {
2181 check_gclog_consistency();
2182 // Ensure that the user has not selected conflicting sets
2183 // of collectors.
2184 uint i = 0;
2185 if (UseSerialGC) i++;
2186 if (UseConcMarkSweepGC) i++;
2187 if (UseParallelGC || UseParallelOldGC) i++;
2188 if (UseG1GC) i++;
2189 if (i > 1) {
2190 jio_fprintf(defaultStream::error_stream(),
2191 "Conflicting collector combinations in option list; "
2192 "please refer to the release notes for the combinations "
2193 "allowed\n");
2194 return false;
2195 }
2196
2197 if (UseConcMarkSweepGC && !UseParNewGC) {
2198 jio_fprintf(defaultStream::error_stream(),
2199 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2200 return false;
2201 }
2202
2203 if (UseParNewGC && !UseConcMarkSweepGC) {
2204 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2205 // set up UseSerialGC properly, so that can't be used in the check here.
2206 jio_fprintf(defaultStream::error_stream(),
2207 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2208 return false;
2209 }
2210
2211 return true;
2212 }
2213
2214 void Arguments::check_deprecated_gc_flags() {
2215 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2216 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2217 }
2218 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2219 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2220 "and will likely be removed in future release");
2221 }
2222 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2223 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2224 "Use MaxRAMFraction instead.");
2225 }
2226 }
2227
2228 // Check stack pages settings
2229 bool Arguments::check_stack_pages()
2230 {
2231 bool status = true;
2232 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2233 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2234 // greater stack shadow pages can't generate instruction to bang stack
2235 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2236 return status;
2237 }
2238
2239 // Check the consistency of vm_init_args
2240 bool Arguments::check_vm_args_consistency() {
2241 // Method for adding checks for flag consistency.
2242 // The intent is to warn the user of all possible conflicts,
2243 // before returning an error.
2244 // Note: Needs platform-dependent factoring.
2245 bool status = true;
2246
2247 if (TLABRefillWasteFraction == 0) {
2248 jio_fprintf(defaultStream::error_stream(),
2249 "TLABRefillWasteFraction should be a denominator, "
2250 "not " SIZE_FORMAT "\n",
2251 TLABRefillWasteFraction);
2252 status = false;
2253 }
2254
2255 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2256 "AdaptiveSizePolicyWeight");
2257 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2258
2259 // Divide by bucket size to prevent a large size from causing rollover when
2260 // calculating amount of memory needed to be allocated for the String table.
2261 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2262 (max_uintx / StringTable::bucket_size()), "StringTable size");
2263
2264 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2265 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2266
2267 {
2268 // Using "else if" below to avoid printing two error messages if min > max.
2269 // This will also prevent us from reporting both min>100 and max>100 at the
2270 // same time, but that is less annoying than printing two identical errors IMHO.
2271 FormatBuffer<80> err_msg("%s","");
2272 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2273 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2274 status = false;
2275 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2276 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2277 status = false;
2278 }
2279 }
2280
2281 // Min/MaxMetaspaceFreeRatio
2282 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2283 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2284
2285 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2288 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2289 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2290 MinMetaspaceFreeRatio,
2291 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2292 MaxMetaspaceFreeRatio);
2293 status = false;
2294 }
2295
2296 // Trying to keep 100% free is not practical
2297 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2298
2299 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2300 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2301 }
2302
2303 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2304 // Settings to encourage splitting.
2305 if (!FLAG_IS_CMDLINE(NewRatio)) {
2306 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2307 }
2308 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2309 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2310 }
2311 }
2312
2313 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2314 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2315 }
2316
2317 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2318 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2319 if (GCTimeLimit == 100) {
2320 // Turn off gc-overhead-limit-exceeded checks
2321 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2322 }
2323
2324 status = status && check_gc_consistency_user();
2325 status = status && check_stack_pages();
2326
2327 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2328 "CMSIncrementalSafetyFactor");
2329
2330 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2331 // insists that we hold the requisite locks so that the iteration is
2332 // MT-safe. For the verification at start-up and shut-down, we don't
2333 // yet have a good way of acquiring and releasing these locks,
2334 // which are not visible at the CollectedHeap level. We want to
2335 // be able to acquire these locks and then do the iteration rather
2336 // than just disable the lock verification. This will be fixed under
2337 // bug 4788986.
2338 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2339 if (VerifyDuringStartup) {
2340 warning("Heap verification at start-up disabled "
2341 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2342 VerifyDuringStartup = false; // Disable verification at start-up
2343 }
2344
2345 if (VerifyBeforeExit) {
2346 warning("Heap verification at shutdown disabled "
2347 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2348 VerifyBeforeExit = false; // Disable verification at shutdown
2349 }
2350 }
2351
2352 // Note: only executed in non-PRODUCT mode
2353 if (!UseAsyncConcMarkSweepGC &&
2354 (ExplicitGCInvokesConcurrent ||
2355 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2356 jio_fprintf(defaultStream::error_stream(),
2357 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2358 " with -UseAsyncConcMarkSweepGC");
2359 status = false;
2360 }
2361
2362 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2363
2364 #if INCLUDE_ALL_GCS
2365 if (UseG1GC) {
2366 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2367 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2368 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2369
2370 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2371 "InitiatingHeapOccupancyPercent");
2372 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2373 "G1RefProcDrainInterval");
2374 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2375 "G1ConcMarkStepDurationMillis");
2376 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2377 "G1ConcRSHotCardLimit");
2378 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2379 "G1ConcRSLogCacheSize");
2380 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2381 "StringDeduplicationAgeThreshold");
2382 }
2383 if (UseConcMarkSweepGC) {
2384 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2385 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2386 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2387 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2388
2389 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2390
2391 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2392 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2393 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2394
2395 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2396
2397 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2398 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2399
2400 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2401 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2402 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2403
2404 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2405
2406 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2407
2408 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2409 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2410 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2411 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2412 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2413 }
2414
2415 if (UseParallelGC || UseParallelOldGC) {
2416 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2417 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2418
2419 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2420 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2421
2422 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2423 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2424
2425 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2426
2427 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2428 }
2429 #endif // INCLUDE_ALL_GCS
2430
2431 status = status && verify_interval(RefDiscoveryPolicy,
2432 ReferenceProcessor::DiscoveryPolicyMin,
2433 ReferenceProcessor::DiscoveryPolicyMax,
2434 "RefDiscoveryPolicy");
2435
2436 // Limit the lower bound of this flag to 1 as it is used in a division
2437 // expression.
2438 status = status && verify_interval(TLABWasteTargetPercent,
2439 1, 100, "TLABWasteTargetPercent");
2440
2441 status = status && verify_object_alignment();
2442
2443 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2444 "CompressedClassSpaceSize");
2445
2446 status = status && verify_interval(MarkStackSizeMax,
2447 1, (max_jint - 1), "MarkStackSizeMax");
2448 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2449
2450 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2451
2452 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2453
2454 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2455
2456 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2457 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2458
2459 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2460
2461 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2462 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2463 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2464 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2465
2466 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2467 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2468
2469 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2470 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2471 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2472
2473 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2474 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2475
2476 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2477 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2478 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2479 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2480
2481 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2482 #ifdef COMPILER1
2483 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2484 #endif
2485
2486 if (PrintNMTStatistics) {
2487 #if INCLUDE_NMT
2488 if (MemTracker::tracking_level() == NMT_off) {
2489 #endif // INCLUDE_NMT
2490 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2491 PrintNMTStatistics = false;
2492 #if INCLUDE_NMT
2493 }
2494 #endif
2495 }
2496
2497 // Need to limit the extent of the padding to reasonable size.
2498 // 8K is well beyond the reasonable HW cache line size, even with the
2499 // aggressive prefetching, while still leaving the room for segregating
2500 // among the distinct pages.
2501 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2502 jio_fprintf(defaultStream::error_stream(),
2503 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2504 ContendedPaddingWidth, 0, 8192);
2505 status = false;
2506 }
2507
2508 // Need to enforce the padding not to break the existing field alignments.
2509 // It is sufficient to check against the largest type size.
2510 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2511 jio_fprintf(defaultStream::error_stream(),
2512 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2513 ContendedPaddingWidth, BytesPerLong);
2514 status = false;
2515 }
2516
2517 // Check lower bounds of the code cache
2518 // Template Interpreter code is approximately 3X larger in debug builds.
2519 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2520 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2521 jio_fprintf(defaultStream::error_stream(),
2522 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2523 os::vm_page_size()/K);
2524 status = false;
2525 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2528 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2529 status = false;
2530 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2533 min_code_cache_size/K);
2534 status = false;
2535 } else if (ReservedCodeCacheSize > 2*G) {
2536 // Code cache size larger than MAXINT is not supported.
2537 jio_fprintf(defaultStream::error_stream(),
2538 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2539 (2*G)/M);
2540 status = false;
2541 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2542 jio_fprintf(defaultStream::error_stream(),
2543 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2544 min_code_cache_size/K);
2545 status = false;
2546 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2547 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2548 jio_fprintf(defaultStream::error_stream(),
2549 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2550 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2551 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2552 status = false;
2553 }
2554
2555 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2556 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2557 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2558 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2559
2560
2561 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2562 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2563 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2564 // Check the minimum number of compiler threads
2565 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2566
2567 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2568 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2569 }
2570
2571 return status;
2572 }
2573
2574 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2575 const char* option_type) {
2576 if (ignore) return false;
2577
2578 const char* spacer = " ";
2579 if (option_type == NULL) {
2580 option_type = ++spacer; // Set both to the empty string.
2581 }
2582
2583 if (os::obsolete_option(option)) {
2584 jio_fprintf(defaultStream::error_stream(),
2585 "Obsolete %s%soption: %s\n", option_type, spacer,
2586 option->optionString);
2587 return false;
2588 } else {
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Unrecognized %s%soption: %s\n", option_type, spacer,
2591 option->optionString);
2592 return true;
2593 }
2594 }
2595
2596 static const char* user_assertion_options[] = {
2597 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2598 };
2599
2600 static const char* system_assertion_options[] = {
2601 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2602 };
2603
2604 bool Arguments::parse_uintx(const char* value,
2605 uintx* uintx_arg,
2606 uintx min_size) {
2607
2608 // Check the sign first since atomull() parses only unsigned values.
2609 bool value_is_positive = !(*value == '-');
2610
2611 if (value_is_positive) {
2612 julong n;
2613 bool good_return = atomull(value, &n);
2614 if (good_return) {
2615 bool above_minimum = n >= min_size;
2616 bool value_is_too_large = n > max_uintx;
2617
2618 if (above_minimum && !value_is_too_large) {
2619 *uintx_arg = n;
2620 return true;
2621 }
2622 }
2623 }
2624 return false;
2625 }
2626
2627 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2628 julong* long_arg,
2629 julong min_size) {
2630 if (!atomull(s, long_arg)) return arg_unreadable;
2631 return check_memory_size(*long_arg, min_size);
2632 }
2633
2634 // Parse JavaVMInitArgs structure
2635
2636 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2637 // For components of the system classpath.
2638 SysClassPath scp(Arguments::get_sysclasspath());
2639 bool scp_assembly_required = false;
2640
2641 // Save default settings for some mode flags
2642 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2643 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2644 Arguments::_ClipInlining = ClipInlining;
2645 Arguments::_BackgroundCompilation = BackgroundCompilation;
2646
2647 // Setup flags for mixed which is the default
2648 set_mode_flags(_mixed);
2649
2650 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2651 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2652 if (result != JNI_OK) {
2653 return result;
2654 }
2655
2656 // Parse JavaVMInitArgs structure passed in
2657 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2658 if (result != JNI_OK) {
2659 return result;
2660 }
2661
2662 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2663 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2664 if (result != JNI_OK) {
2665 return result;
2666 }
2667
2668 // Do final processing now that all arguments have been parsed
2669 result = finalize_vm_init_args(&scp, scp_assembly_required);
2670 if (result != JNI_OK) {
2671 return result;
2672 }
2673
2674 return JNI_OK;
2675 }
2676
2677 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2678 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2679 // are dealing with -agentpath (case where name is a path), otherwise with
2680 // -agentlib
2681 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2682 char *_name;
2683 const char *_hprof = "hprof", *_jdwp = "jdwp";
2684 size_t _len_hprof, _len_jdwp, _len_prefix;
2685
2686 if (is_path) {
2687 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2688 return false;
2689 }
2690
2691 _name++; // skip past last path separator
2692 _len_prefix = strlen(JNI_LIB_PREFIX);
2693
2694 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2695 return false;
2696 }
2697
2698 _name += _len_prefix;
2699 _len_hprof = strlen(_hprof);
2700 _len_jdwp = strlen(_jdwp);
2701
2702 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2703 _name += _len_hprof;
2704 }
2705 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2706 _name += _len_jdwp;
2707 }
2708 else {
2709 return false;
2710 }
2711
2712 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2713 return false;
2714 }
2715
2716 return true;
2717 }
2718
2719 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2720 return true;
2721 }
2722
2723 return false;
2724 }
2725
2726 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2727 SysClassPath* scp_p,
2728 bool* scp_assembly_required_p,
2729 Flag::Flags origin) {
2730 // Remaining part of option string
2731 const char* tail;
2732
2733 // iterate over arguments
2734 for (int index = 0; index < args->nOptions; index++) {
2735 bool is_absolute_path = false; // for -agentpath vs -agentlib
2736
2737 const JavaVMOption* option = args->options + index;
2738
2739 if (!match_option(option, "-Djava.class.path", &tail) &&
2740 !match_option(option, "-Dsun.java.command", &tail) &&
2741 !match_option(option, "-Dsun.java.launcher", &tail)) {
2742
2743 // add all jvm options to the jvm_args string. This string
2744 // is used later to set the java.vm.args PerfData string constant.
2745 // the -Djava.class.path and the -Dsun.java.command options are
2746 // omitted from jvm_args string as each have their own PerfData
2747 // string constant object.
2748 build_jvm_args(option->optionString);
2749 }
2750
2751 // -verbose:[class/gc/jni]
2752 if (match_option(option, "-verbose", &tail)) {
2753 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2754 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2755 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2756 } else if (!strcmp(tail, ":gc")) {
2757 FLAG_SET_CMDLINE(bool, PrintGC, true);
2758 } else if (!strcmp(tail, ":jni")) {
2759 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2760 }
2761 // -da / -ea / -disableassertions / -enableassertions
2762 // These accept an optional class/package name separated by a colon, e.g.,
2763 // -da:java.lang.Thread.
2764 } else if (match_option(option, user_assertion_options, &tail, true)) {
2765 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2766 if (*tail == '\0') {
2767 JavaAssertions::setUserClassDefault(enable);
2768 } else {
2769 assert(*tail == ':', "bogus match by match_option()");
2770 JavaAssertions::addOption(tail + 1, enable);
2771 }
2772 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2773 } else if (match_option(option, system_assertion_options, &tail, false)) {
2774 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2775 JavaAssertions::setSystemClassDefault(enable);
2776 // -bootclasspath:
2777 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2778 scp_p->reset_path(tail);
2779 *scp_assembly_required_p = true;
2780 // -bootclasspath/a:
2781 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2782 scp_p->add_suffix(tail);
2783 *scp_assembly_required_p = true;
2784 // -bootclasspath/p:
2785 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2786 scp_p->add_prefix(tail);
2787 *scp_assembly_required_p = true;
2788 // -Xrun
2789 } else if (match_option(option, "-Xrun", &tail)) {
2790 if (tail != NULL) {
2791 const char* pos = strchr(tail, ':');
2792 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2793 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2794 name[len] = '\0';
2795
2796 char *options = NULL;
2797 if(pos != NULL) {
2798 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2799 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2800 }
2801 #if !INCLUDE_JVMTI
2802 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2803 jio_fprintf(defaultStream::error_stream(),
2804 "Profiling and debugging agents are not supported in this VM\n");
2805 return JNI_ERR;
2806 }
2807 #endif // !INCLUDE_JVMTI
2808 add_init_library(name, options);
2809 }
2810 // -agentlib and -agentpath
2811 } else if (match_option(option, "-agentlib:", &tail) ||
2812 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2813 if(tail != NULL) {
2814 const char* pos = strchr(tail, '=');
2815 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2816 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2817 name[len] = '\0';
2818
2819 char *options = NULL;
2820 if(pos != NULL) {
2821 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2822 }
2823 #if !INCLUDE_JVMTI
2824 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2825 jio_fprintf(defaultStream::error_stream(),
2826 "Profiling and debugging agents are not supported in this VM\n");
2827 return JNI_ERR;
2828 }
2829 #endif // !INCLUDE_JVMTI
2830 add_init_agent(name, options, is_absolute_path);
2831 }
2832 // -javaagent
2833 } else if (match_option(option, "-javaagent:", &tail)) {
2834 #if !INCLUDE_JVMTI
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Instrumentation agents are not supported in this VM\n");
2837 return JNI_ERR;
2838 #else
2839 if(tail != NULL) {
2840 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2841 add_init_agent("instrument", options, false);
2842 }
2843 #endif // !INCLUDE_JVMTI
2844 // -Xnoclassgc
2845 } else if (match_option(option, "-Xnoclassgc")) {
2846 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2847 // -Xconcgc
2848 } else if (match_option(option, "-Xconcgc")) {
2849 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2850 // -Xnoconcgc
2851 } else if (match_option(option, "-Xnoconcgc")) {
2852 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2853 // -Xbatch
2854 } else if (match_option(option, "-Xbatch")) {
2855 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2856 // -Xmn for compatibility with other JVM vendors
2857 } else if (match_option(option, "-Xmn", &tail)) {
2858 julong long_initial_young_size = 0;
2859 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2860 if (errcode != arg_in_range) {
2861 jio_fprintf(defaultStream::error_stream(),
2862 "Invalid initial young generation size: %s\n", option->optionString);
2863 describe_range_error(errcode);
2864 return JNI_EINVAL;
2865 }
2866 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2867 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2868 // -Xms
2869 } else if (match_option(option, "-Xms", &tail)) {
2870 julong long_initial_heap_size = 0;
2871 // an initial heap size of 0 means automatically determine
2872 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2873 if (errcode != arg_in_range) {
2874 jio_fprintf(defaultStream::error_stream(),
2875 "Invalid initial heap size: %s\n", option->optionString);
2876 describe_range_error(errcode);
2877 return JNI_EINVAL;
2878 }
2879 set_min_heap_size((uintx)long_initial_heap_size);
2880 // Currently the minimum size and the initial heap sizes are the same.
2881 // Can be overridden with -XX:InitialHeapSize.
2882 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2883 // -Xmx
2884 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2885 julong long_max_heap_size = 0;
2886 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2887 if (errcode != arg_in_range) {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Invalid maximum heap size: %s\n", option->optionString);
2890 describe_range_error(errcode);
2891 return JNI_EINVAL;
2892 }
2893 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2894 // Xmaxf
2895 } else if (match_option(option, "-Xmaxf", &tail)) {
2896 char* err;
2897 int maxf = (int)(strtod(tail, &err) * 100);
2898 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2899 jio_fprintf(defaultStream::error_stream(),
2900 "Bad max heap free percentage size: %s\n",
2901 option->optionString);
2902 return JNI_EINVAL;
2903 } else {
2904 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2905 }
2906 // Xminf
2907 } else if (match_option(option, "-Xminf", &tail)) {
2908 char* err;
2909 int minf = (int)(strtod(tail, &err) * 100);
2910 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Bad min heap free percentage size: %s\n",
2913 option->optionString);
2914 return JNI_EINVAL;
2915 } else {
2916 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2917 }
2918 // -Xss
2919 } else if (match_option(option, "-Xss", &tail)) {
2920 julong long_ThreadStackSize = 0;
2921 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2922 if (errcode != arg_in_range) {
2923 jio_fprintf(defaultStream::error_stream(),
2924 "Invalid thread stack size: %s\n", option->optionString);
2925 describe_range_error(errcode);
2926 return JNI_EINVAL;
2927 }
2928 // Internally track ThreadStackSize in units of 1024 bytes.
2929 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2930 round_to((int)long_ThreadStackSize, K) / K);
2931 // -Xoss
2932 } else if (match_option(option, "-Xoss", &tail)) {
2933 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2934 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2935 julong long_CodeCacheExpansionSize = 0;
2936 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2937 if (errcode != arg_in_range) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2940 os::vm_page_size()/K);
2941 return JNI_EINVAL;
2942 }
2943 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2944 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2945 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2946 julong long_ReservedCodeCacheSize = 0;
2947
2948 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2949 if (errcode != arg_in_range) {
2950 jio_fprintf(defaultStream::error_stream(),
2951 "Invalid maximum code cache size: %s.\n", option->optionString);
2952 return JNI_EINVAL;
2953 }
2954 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2955 // -XX:NonNMethodCodeHeapSize=
2956 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2957 julong long_NonNMethodCodeHeapSize = 0;
2958
2959 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2960 if (errcode != arg_in_range) {
2961 jio_fprintf(defaultStream::error_stream(),
2962 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2963 return JNI_EINVAL;
2964 }
2965 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2966 // -XX:ProfiledCodeHeapSize=
2967 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2968 julong long_ProfiledCodeHeapSize = 0;
2969
2970 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2971 if (errcode != arg_in_range) {
2972 jio_fprintf(defaultStream::error_stream(),
2973 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2974 return JNI_EINVAL;
2975 }
2976 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2977 // -XX:NonProfiledCodeHeapSizee=
2978 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2979 julong long_NonProfiledCodeHeapSize = 0;
2980
2981 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2982 if (errcode != arg_in_range) {
2983 jio_fprintf(defaultStream::error_stream(),
2984 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2985 return JNI_EINVAL;
2986 }
2987 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2988 //-XX:IncreaseFirstTierCompileThresholdAt=
2989 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2990 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2991 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2992 jio_fprintf(defaultStream::error_stream(),
2993 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2994 option->optionString);
2995 return JNI_EINVAL;
2996 }
2997 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2998 // -green
2999 } else if (match_option(option, "-green")) {
3000 jio_fprintf(defaultStream::error_stream(),
3001 "Green threads support not available\n");
3002 return JNI_EINVAL;
3003 // -native
3004 } else if (match_option(option, "-native")) {
3005 // HotSpot always uses native threads, ignore silently for compatibility
3006 // -Xsqnopause
3007 } else if (match_option(option, "-Xsqnopause")) {
3008 // EVM option, ignore silently for compatibility
3009 // -Xrs
3010 } else if (match_option(option, "-Xrs")) {
3011 // Classic/EVM option, new functionality
3012 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3013 } else if (match_option(option, "-Xusealtsigs")) {
3014 // change default internal VM signals used - lower case for back compat
3015 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3016 // -Xoptimize
3017 } else if (match_option(option, "-Xoptimize")) {
3018 // EVM option, ignore silently for compatibility
3019 // -Xprof
3020 } else if (match_option(option, "-Xprof")) {
3021 #if INCLUDE_FPROF
3022 _has_profile = true;
3023 #else // INCLUDE_FPROF
3024 jio_fprintf(defaultStream::error_stream(),
3025 "Flat profiling is not supported in this VM.\n");
3026 return JNI_ERR;
3027 #endif // INCLUDE_FPROF
3028 // -Xconcurrentio
3029 } else if (match_option(option, "-Xconcurrentio")) {
3030 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3031 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3032 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3033 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3034 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3035
3036 // -Xinternalversion
3037 } else if (match_option(option, "-Xinternalversion")) {
3038 jio_fprintf(defaultStream::output_stream(), "%s\n",
3039 VM_Version::internal_vm_info_string());
3040 vm_exit(0);
3041 #ifndef PRODUCT
3042 // -Xprintflags
3043 } else if (match_option(option, "-Xprintflags", &tail)) {
3044 CommandLineFlags::printFlags(tty, false);
3045 vm_exit(0);
3046 #endif
3047 // -D
3048 } else if (match_option(option, "-D", &tail)) {
3049 if (!add_property(tail)) {
3050 return JNI_ENOMEM;
3051 }
3052 // Out of the box management support
3053 if (match_option(option, "-Dcom.sun.management", &tail)) {
3054 #if INCLUDE_MANAGEMENT
3055 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3056 #else
3057 jio_fprintf(defaultStream::output_stream(),
3058 "-Dcom.sun.management is not supported in this VM.\n");
3059 return JNI_ERR;
3060 #endif
3061 }
3062 // -Xint
3063 } else if (match_option(option, "-Xint")) {
3064 set_mode_flags(_int);
3065 // -Xmixed
3066 } else if (match_option(option, "-Xmixed")) {
3067 set_mode_flags(_mixed);
3068 // -Xcomp
3069 } else if (match_option(option, "-Xcomp")) {
3070 // for testing the compiler; turn off all flags that inhibit compilation
3071 set_mode_flags(_comp);
3072 // -Xshare:dump
3073 } else if (match_option(option, "-Xshare:dump")) {
3074 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3075 set_mode_flags(_int); // Prevent compilation, which creates objects
3076 // -Xshare:on
3077 } else if (match_option(option, "-Xshare:on")) {
3078 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3079 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3080 // -Xshare:auto
3081 } else if (match_option(option, "-Xshare:auto")) {
3082 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3083 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3084 // -Xshare:off
3085 } else if (match_option(option, "-Xshare:off")) {
3086 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3087 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3088 // -Xverify
3089 } else if (match_option(option, "-Xverify", &tail)) {
3090 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3091 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3092 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3093 } else if (strcmp(tail, ":remote") == 0) {
3094 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3095 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3096 } else if (strcmp(tail, ":none") == 0) {
3097 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3098 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3099 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3100 return JNI_EINVAL;
3101 }
3102 // -Xdebug
3103 } else if (match_option(option, "-Xdebug")) {
3104 // note this flag has been used, then ignore
3105 set_xdebug_mode(true);
3106 // -Xnoagent
3107 } else if (match_option(option, "-Xnoagent")) {
3108 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3109 } else if (match_option(option, "-Xboundthreads")) {
3110 // Bind user level threads to kernel threads (Solaris only)
3111 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3112 } else if (match_option(option, "-Xloggc:", &tail)) {
3113 // Redirect GC output to the file. -Xloggc:<filename>
3114 // ostream_init_log(), when called will use this filename
3115 // to initialize a fileStream.
3116 _gc_log_filename = os::strdup_check_oom(tail);
3117 if (!is_filename_valid(_gc_log_filename)) {
3118 jio_fprintf(defaultStream::output_stream(),
3119 "Invalid file name for use with -Xloggc: Filename can only contain the "
3120 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3121 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3122 return JNI_EINVAL;
3123 }
3124 FLAG_SET_CMDLINE(bool, PrintGC, true);
3125 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3126
3127 // JNI hooks
3128 } else if (match_option(option, "-Xcheck", &tail)) {
3129 if (!strcmp(tail, ":jni")) {
3130 #if !INCLUDE_JNI_CHECK
3131 warning("JNI CHECKING is not supported in this VM");
3132 #else
3133 CheckJNICalls = true;
3134 #endif // INCLUDE_JNI_CHECK
3135 } else if (is_bad_option(option, args->ignoreUnrecognized,
3136 "check")) {
3137 return JNI_EINVAL;
3138 }
3139 } else if (match_option(option, "vfprintf")) {
3140 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3141 } else if (match_option(option, "exit")) {
3142 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3143 } else if (match_option(option, "abort")) {
3144 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3145 // -XX:+AggressiveHeap
3146 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3147
3148 // This option inspects the machine and attempts to set various
3149 // parameters to be optimal for long-running, memory allocation
3150 // intensive jobs. It is intended for machines with large
3151 // amounts of cpu and memory.
3152
3153 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3154 // VM, but we may not be able to represent the total physical memory
3155 // available (like having 8gb of memory on a box but using a 32bit VM).
3156 // Thus, we need to make sure we're using a julong for intermediate
3157 // calculations.
3158 julong initHeapSize;
3159 julong total_memory = os::physical_memory();
3160
3161 if (total_memory < (julong)256*M) {
3162 jio_fprintf(defaultStream::error_stream(),
3163 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3164 vm_exit(1);
3165 }
3166
3167 // The heap size is half of available memory, or (at most)
3168 // all of possible memory less 160mb (leaving room for the OS
3169 // when using ISM). This is the maximum; because adaptive sizing
3170 // is turned on below, the actual space used may be smaller.
3171
3172 initHeapSize = MIN2(total_memory / (julong)2,
3173 total_memory - (julong)160*M);
3174
3175 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3176
3177 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3178 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3179 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3180 // Currently the minimum size and the initial heap sizes are the same.
3181 set_min_heap_size(initHeapSize);
3182 }
3183 if (FLAG_IS_DEFAULT(NewSize)) {
3184 // Make the young generation 3/8ths of the total heap.
3185 FLAG_SET_CMDLINE(uintx, NewSize,
3186 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3187 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3188 }
3189
3190 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3191 FLAG_SET_DEFAULT(UseLargePages, true);
3192 #endif
3193
3194 // Increase some data structure sizes for efficiency
3195 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3196 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3197 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3198
3199 // See the OldPLABSize comment below, but replace 'after promotion'
3200 // with 'after copying'. YoungPLABSize is the size of the survivor
3201 // space per-gc-thread buffers. The default is 4kw.
3202 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3203
3204 // OldPLABSize is the size of the buffers in the old gen that
3205 // UseParallelGC uses to promote live data that doesn't fit in the
3206 // survivor spaces. At any given time, there's one for each gc thread.
3207 // The default size is 1kw. These buffers are rarely used, since the
3208 // survivor spaces are usually big enough. For specjbb, however, there
3209 // are occasions when there's lots of live data in the young gen
3210 // and we end up promoting some of it. We don't have a definite
3211 // explanation for why bumping OldPLABSize helps, but the theory
3212 // is that a bigger PLAB results in retaining something like the
3213 // original allocation order after promotion, which improves mutator
3214 // locality. A minor effect may be that larger PLABs reduce the
3215 // number of PLAB allocation events during gc. The value of 8kw
3216 // was arrived at by experimenting with specjbb.
3217 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3218
3219 // Enable parallel GC and adaptive generation sizing
3220 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3221 FLAG_SET_DEFAULT(ParallelGCThreads,
3222 Abstract_VM_Version::parallel_worker_threads());
3223
3224 // Encourage steady state memory management
3225 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3226
3227 // This appears to improve mutator locality
3228 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3229
3230 // Get around early Solaris scheduling bug
3231 // (affinity vs other jobs on system)
3232 // but disallow DR and offlining (5008695).
3233 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3234
3235 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3236 // and the last option wins.
3237 } else if (match_option(option, "-XX:+NeverTenure")) {
3238 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3239 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3240 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3241 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3242 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3243 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3244 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3245 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3246 uintx max_tenuring_thresh = 0;
3247 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3248 jio_fprintf(defaultStream::error_stream(),
3249 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3250 }
3251 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3252
3253 if (MaxTenuringThreshold == 0) {
3254 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3255 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3256 } else {
3257 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3258 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3259 }
3260 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled") ||
3261 match_option(option, "-XX:-CMSPermGenSweepingEnabled")) {
3262 jio_fprintf(defaultStream::error_stream(),
3263 "Please use CMSClassUnloadingEnabled in place of "
3264 "CMSPermGenSweepingEnabled in the future\n");
3265 } else if (match_option(option, "-XX:+UseGCTimeLimit")) {
3266 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3267 jio_fprintf(defaultStream::error_stream(),
3268 "Please use -XX:+UseGCOverheadLimit in place of "
3269 "-XX:+UseGCTimeLimit in the future\n");
3270 } else if (match_option(option, "-XX:-UseGCTimeLimit")) {
3271 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3272 jio_fprintf(defaultStream::error_stream(),
3273 "Please use -XX:-UseGCOverheadLimit in place of "
3274 "-XX:-UseGCTimeLimit in the future\n");
3275 // The TLE options are for compatibility with 1.3 and will be
3276 // removed without notice in a future release. These options
3277 // are not to be documented.
3278 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3279 // No longer used.
3280 } else if (match_option(option, "-XX:+ResizeTLE")) {
3281 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3282 } else if (match_option(option, "-XX:-ResizeTLE")) {
3283 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3284 } else if (match_option(option, "-XX:+PrintTLE")) {
3285 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3286 } else if (match_option(option, "-XX:-PrintTLE")) {
3287 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3288 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3289 // No longer used.
3290 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3291 julong long_tlab_size = 0;
3292 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3293 if (errcode != arg_in_range) {
3294 jio_fprintf(defaultStream::error_stream(),
3295 "Invalid TLAB size: %s\n", option->optionString);
3296 describe_range_error(errcode);
3297 return JNI_EINVAL;
3298 }
3299 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3300 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3301 // No longer used.
3302 } else if (match_option(option, "-XX:+UseTLE")) {
3303 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3304 } else if (match_option(option, "-XX:-UseTLE")) {
3305 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3306 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3307 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3308 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3309 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3310 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3311 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3312 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3313 #if defined(DTRACE_ENABLED)
3314 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3315 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3316 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3317 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3318 #else // defined(DTRACE_ENABLED)
3319 jio_fprintf(defaultStream::error_stream(),
3320 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3321 return JNI_EINVAL;
3322 #endif // defined(DTRACE_ENABLED)
3323 #ifdef ASSERT
3324 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3325 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3326 // disable scavenge before parallel mark-compact
3327 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3328 #endif
3329 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3330 julong cms_blocks_to_claim = (julong)atol(tail);
3331 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3332 jio_fprintf(defaultStream::error_stream(),
3333 "Please use -XX:OldPLABSize in place of "
3334 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3335 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3336 julong cms_blocks_to_claim = (julong)atol(tail);
3337 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3338 jio_fprintf(defaultStream::error_stream(),
3339 "Please use -XX:OldPLABSize in place of "
3340 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3341 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3342 julong old_plab_size = 0;
3343 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3344 if (errcode != arg_in_range) {
3345 jio_fprintf(defaultStream::error_stream(),
3346 "Invalid old PLAB size: %s\n", option->optionString);
3347 describe_range_error(errcode);
3348 return JNI_EINVAL;
3349 }
3350 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3351 jio_fprintf(defaultStream::error_stream(),
3352 "Please use -XX:OldPLABSize in place of "
3353 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3354 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3355 julong young_plab_size = 0;
3356 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3357 if (errcode != arg_in_range) {
3358 jio_fprintf(defaultStream::error_stream(),
3359 "Invalid young PLAB size: %s\n", option->optionString);
3360 describe_range_error(errcode);
3361 return JNI_EINVAL;
3362 }
3363 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3364 jio_fprintf(defaultStream::error_stream(),
3365 "Please use -XX:YoungPLABSize in place of "
3366 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3367 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3368 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3369 julong stack_size = 0;
3370 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3371 if (errcode != arg_in_range) {
3372 jio_fprintf(defaultStream::error_stream(),
3373 "Invalid mark stack size: %s\n", option->optionString);
3374 describe_range_error(errcode);
3375 return JNI_EINVAL;
3376 }
3377 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3378 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3379 julong max_stack_size = 0;
3380 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3381 if (errcode != arg_in_range) {
3382 jio_fprintf(defaultStream::error_stream(),
3383 "Invalid maximum mark stack size: %s\n",
3384 option->optionString);
3385 describe_range_error(errcode);
3386 return JNI_EINVAL;
3387 }
3388 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3389 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3390 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3391 uintx conc_threads = 0;
3392 if (!parse_uintx(tail, &conc_threads, 1)) {
3393 jio_fprintf(defaultStream::error_stream(),
3394 "Invalid concurrent threads: %s\n", option->optionString);
3395 return JNI_EINVAL;
3396 }
3397 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3398 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3399 julong max_direct_memory_size = 0;
3400 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3401 if (errcode != arg_in_range) {
3402 jio_fprintf(defaultStream::error_stream(),
3403 "Invalid maximum direct memory size: %s\n",
3404 option->optionString);
3405 describe_range_error(errcode);
3406 return JNI_EINVAL;
3407 }
3408 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3409 #if !INCLUDE_MANAGEMENT
3410 } else if (match_option(option, "-XX:+ManagementServer")) {
3411 jio_fprintf(defaultStream::error_stream(),
3412 "ManagementServer is not supported in this VM.\n");
3413 return JNI_ERR;
3414 #endif // INCLUDE_MANAGEMENT
3415 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3416 // Skip -XX:Flags= since that case has already been handled
3417 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3418 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3419 return JNI_EINVAL;
3420 }
3421 }
3422 // Unknown option
3423 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3424 return JNI_ERR;
3425 }
3426 }
3427
3428 // PrintSharedArchiveAndExit will turn on
3429 // -Xshare:on
3430 // -XX:+TraceClassPaths
3431 if (PrintSharedArchiveAndExit) {
3432 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3433 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3434 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3435 }
3436
3437 // Change the default value for flags which have different default values
3438 // when working with older JDKs.
3439 #ifdef LINUX
3440 if (JDK_Version::current().compare_major(6) <= 0 &&
3441 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3442 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3443 }
3444 #endif // LINUX
3445 fix_appclasspath();
3446 return JNI_OK;
3447 }
3448
3449 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3450 //
3451 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3452 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3453 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3454 // path is treated as the current directory.
3455 //
3456 // This causes problems with CDS, which requires that all directories specified in the classpath
3457 // must be empty. In most cases, applications do NOT want to load classes from the current
3458 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3459 // scripts compatible with CDS.
3460 void Arguments::fix_appclasspath() {
3461 if (IgnoreEmptyClassPaths) {
3462 const char separator = *os::path_separator();
3463 const char* src = _java_class_path->value();
3464
3465 // skip over all the leading empty paths
3466 while (*src == separator) {
3467 src ++;
3468 }
3469
3470 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3471 strncpy(copy, src, strlen(src) + 1);
3472
3473 // trim all trailing empty paths
3474 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3475 *tail = '\0';
3476 }
3477
3478 char from[3] = {separator, separator, '\0'};
3479 char to [2] = {separator, '\0'};
3480 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3481 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3482 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3483 }
3484
3485 _java_class_path->set_value(copy);
3486 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3487 }
3488
3489 if (!PrintSharedArchiveAndExit) {
3490 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3491 }
3492 }
3493
3494 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3495 // This must be done after all -D arguments have been processed.
3496 scp_p->expand_endorsed();
3497
3498 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3499 // Assemble the bootclasspath elements into the final path.
3500 Arguments::set_sysclasspath(scp_p->combined_path());
3501 }
3502
3503 // This must be done after all arguments have been processed.
3504 // java_compiler() true means set to "NONE" or empty.
3505 if (java_compiler() && !xdebug_mode()) {
3506 // For backwards compatibility, we switch to interpreted mode if
3507 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3508 // not specified.
3509 set_mode_flags(_int);
3510 }
3511
3512 if ((TieredCompilation && CompileThresholdScaling == 0)
3513 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3514 set_mode_flags(_int);
3515 }
3516
3517 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3518 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3519 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3520 }
3521
3522 #ifndef COMPILER2
3523 // Don't degrade server performance for footprint
3524 if (FLAG_IS_DEFAULT(UseLargePages) &&
3525 MaxHeapSize < LargePageHeapSizeThreshold) {
3526 // No need for large granularity pages w/small heaps.
3527 // Note that large pages are enabled/disabled for both the
3528 // Java heap and the code cache.
3529 FLAG_SET_DEFAULT(UseLargePages, false);
3530 }
3531
3532 #else
3533 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3534 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3535 }
3536 #endif
3537
3538 #ifndef TIERED
3539 // Tiered compilation is undefined.
3540 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3541 #endif
3542
3543 // If we are running in a headless jre, force java.awt.headless property
3544 // to be true unless the property has already been set.
3545 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3546 if (os::is_headless_jre()) {
3547 const char* headless = Arguments::get_property("java.awt.headless");
3548 if (headless == NULL) {
3549 char envbuffer[128];
3550 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3551 if (!add_property("java.awt.headless=true")) {
3552 return JNI_ENOMEM;
3553 }
3554 } else {
3555 char buffer[256];
3556 strcpy(buffer, "java.awt.headless=");
3557 strcat(buffer, envbuffer);
3558 if (!add_property(buffer)) {
3559 return JNI_ENOMEM;
3560 }
3561 }
3562 }
3563 }
3564
3565 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3566 // CMS can only be used with ParNew
3567 FLAG_SET_ERGO(bool, UseParNewGC, true);
3568 }
3569
3570 if (!check_vm_args_consistency()) {
3571 return JNI_ERR;
3572 }
3573
3574 return JNI_OK;
3575 }
3576
3577 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3578 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3579 scp_assembly_required_p);
3580 }
3581
3582 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3583 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3584 scp_assembly_required_p);
3585 }
3586
3587 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3588 const int N_MAX_OPTIONS = 64;
3589 const int OPTION_BUFFER_SIZE = 1024;
3590 char buffer[OPTION_BUFFER_SIZE];
3591
3592 // The variable will be ignored if it exceeds the length of the buffer.
3593 // Don't check this variable if user has special privileges
3594 // (e.g. unix su command).
3595 if (os::getenv(name, buffer, sizeof(buffer)) &&
3596 !os::have_special_privileges()) {
3597 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3598 jio_fprintf(defaultStream::error_stream(),
3599 "Picked up %s: %s\n", name, buffer);
3600 char* rd = buffer; // pointer to the input string (rd)
3601 int i;
3602 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3603 while (isspace(*rd)) rd++; // skip whitespace
3604 if (*rd == 0) break; // we re done when the input string is read completely
3605
3606 // The output, option string, overwrites the input string.
3607 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3608 // input string (rd).
3609 char* wrt = rd;
3610
3611 options[i++].optionString = wrt; // Fill in option
3612 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3613 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3614 int quote = *rd; // matching quote to look for
3615 rd++; // don't copy open quote
3616 while (*rd != quote) { // include everything (even spaces) up until quote
3617 if (*rd == 0) { // string termination means unmatched string
3618 jio_fprintf(defaultStream::error_stream(),
3619 "Unmatched quote in %s\n", name);
3620 return JNI_ERR;
3621 }
3622 *wrt++ = *rd++; // copy to option string
3623 }
3624 rd++; // don't copy close quote
3625 } else {
3626 *wrt++ = *rd++; // copy to option string
3627 }
3628 }
3629 // Need to check if we're done before writing a NULL,
3630 // because the write could be to the byte that rd is pointing to.
3631 if (*rd++ == 0) {
3632 *wrt = 0;
3633 break;
3634 }
3635 *wrt = 0; // Zero terminate option
3636 }
3637 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3638 JavaVMInitArgs vm_args;
3639 vm_args.version = JNI_VERSION_1_2;
3640 vm_args.options = options;
3641 vm_args.nOptions = i;
3642 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3643
3644 if (PrintVMOptions) {
3645 const char* tail;
3646 for (int i = 0; i < vm_args.nOptions; i++) {
3647 const JavaVMOption *option = vm_args.options + i;
3648 if (match_option(option, "-XX:", &tail)) {
3649 logOption(tail);
3650 }
3651 }
3652 }
3653
3654 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3655 }
3656 return JNI_OK;
3657 }
3658
3659 void Arguments::set_shared_spaces_flags() {
3660 if (DumpSharedSpaces) {
3661 if (RequireSharedSpaces) {
3662 warning("cannot dump shared archive while using shared archive");
3663 }
3664 UseSharedSpaces = false;
3665 #ifdef _LP64
3666 if (!UseCompressedOops || !UseCompressedClassPointers) {
3667 vm_exit_during_initialization(
3668 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3669 }
3670 } else {
3671 if (!UseCompressedOops || !UseCompressedClassPointers) {
3672 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3673 }
3674 #endif
3675 }
3676 }
3677
3678 #if !INCLUDE_ALL_GCS
3679 static void force_serial_gc() {
3680 FLAG_SET_DEFAULT(UseSerialGC, true);
3681 UNSUPPORTED_GC_OPTION(UseG1GC);
3682 UNSUPPORTED_GC_OPTION(UseParallelGC);
3683 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3684 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3685 UNSUPPORTED_GC_OPTION(UseParNewGC);
3686 }
3687 #endif // INCLUDE_ALL_GCS
3688
3689 // Sharing support
3690 // Construct the path to the archive
3691 static char* get_shared_archive_path() {
3692 char *shared_archive_path;
3693 if (SharedArchiveFile == NULL) {
3694 char jvm_path[JVM_MAXPATHLEN];
3695 os::jvm_path(jvm_path, sizeof(jvm_path));
3696 char *end = strrchr(jvm_path, *os::file_separator());
3697 if (end != NULL) *end = '\0';
3698 size_t jvm_path_len = strlen(jvm_path);
3699 size_t file_sep_len = strlen(os::file_separator());
3700 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3701 file_sep_len + 20, mtInternal);
3702 if (shared_archive_path != NULL) {
3703 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3704 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3705 strncat(shared_archive_path, "classes.jsa", 11);
3706 }
3707 } else {
3708 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3709 if (shared_archive_path != NULL) {
3710 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3711 }
3712 }
3713 return shared_archive_path;
3714 }
3715
3716 #ifndef PRODUCT
3717 // Determine whether LogVMOutput should be implicitly turned on.
3718 static bool use_vm_log() {
3719 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3720 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3721 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3722 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3723 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3724 return true;
3725 }
3726
3727 #ifdef COMPILER1
3728 if (PrintC1Statistics) {
3729 return true;
3730 }
3731 #endif // COMPILER1
3732
3733 #ifdef COMPILER2
3734 if (PrintOptoAssembly || PrintOptoStatistics) {
3735 return true;
3736 }
3737 #endif // COMPILER2
3738
3739 return false;
3740 }
3741 #endif // PRODUCT
3742
3743 // Parse entry point called from JNI_CreateJavaVM
3744
3745 jint Arguments::parse(const JavaVMInitArgs* args) {
3746
3747 // Remaining part of option string
3748 const char* tail;
3749
3750 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3751 const char* hotspotrc = ".hotspotrc";
3752 bool settings_file_specified = false;
3753 bool needs_hotspotrc_warning = false;
3754
3755 const char* flags_file;
3756 int index;
3757 for (index = 0; index < args->nOptions; index++) {
3758 const JavaVMOption *option = args->options + index;
3759 if (ArgumentsExt::process_options(option)) {
3760 continue;
3761 }
3762 if (match_option(option, "-XX:Flags=", &tail)) {
3763 flags_file = tail;
3764 settings_file_specified = true;
3765 continue;
3766 }
3767 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3768 PrintVMOptions = true;
3769 continue;
3770 }
3771 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3772 PrintVMOptions = false;
3773 continue;
3774 }
3775 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3776 IgnoreUnrecognizedVMOptions = true;
3777 continue;
3778 }
3779 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3780 IgnoreUnrecognizedVMOptions = false;
3781 continue;
3782 }
3783 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3784 CommandLineFlags::printFlags(tty, false);
3785 vm_exit(0);
3786 }
3787 #if INCLUDE_NMT
3788 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3789 // The launcher did not setup nmt environment variable properly.
3790 if (!MemTracker::check_launcher_nmt_support(tail)) {
3791 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3792 }
3793
3794 // Verify if nmt option is valid.
3795 if (MemTracker::verify_nmt_option()) {
3796 // Late initialization, still in single-threaded mode.
3797 if (MemTracker::tracking_level() >= NMT_summary) {
3798 MemTracker::init();
3799 }
3800 } else {
3801 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3802 }
3803 continue;
3804 }
3805 #endif
3806
3807
3808 #ifndef PRODUCT
3809 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3810 CommandLineFlags::printFlags(tty, true);
3811 vm_exit(0);
3812 }
3813 #endif
3814 }
3815
3816 if (IgnoreUnrecognizedVMOptions) {
3817 // uncast const to modify the flag args->ignoreUnrecognized
3818 *(jboolean*)(&args->ignoreUnrecognized) = true;
3819 }
3820
3821 // Parse specified settings file
3822 if (settings_file_specified) {
3823 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3824 return JNI_EINVAL;
3825 }
3826 } else {
3827 #ifdef ASSERT
3828 // Parse default .hotspotrc settings file
3829 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3830 return JNI_EINVAL;
3831 }
3832 #else
3833 struct stat buf;
3834 if (os::stat(hotspotrc, &buf) == 0) {
3835 needs_hotspotrc_warning = true;
3836 }
3837 #endif
3838 }
3839
3840 if (PrintVMOptions) {
3841 for (index = 0; index < args->nOptions; index++) {
3842 const JavaVMOption *option = args->options + index;
3843 if (match_option(option, "-XX:", &tail)) {
3844 logOption(tail);
3845 }
3846 }
3847 }
3848
3849 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3850 jint result = parse_vm_init_args(args);
3851 if (result != JNI_OK) {
3852 return result;
3853 }
3854
3855 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3856 SharedArchivePath = get_shared_archive_path();
3857 if (SharedArchivePath == NULL) {
3858 return JNI_ENOMEM;
3859 }
3860
3861 // Set up VerifySharedSpaces
3862 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3863 VerifySharedSpaces = true;
3864 }
3865
3866 // Delay warning until here so that we've had a chance to process
3867 // the -XX:-PrintWarnings flag
3868 if (needs_hotspotrc_warning) {
3869 warning("%s file is present but has been ignored. "
3870 "Run with -XX:Flags=%s to load the file.",
3871 hotspotrc, hotspotrc);
3872 }
3873
3874 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3875 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3876 #endif
3877
3878 #if INCLUDE_ALL_GCS
3879 #if (defined JAVASE_EMBEDDED || defined ARM)
3880 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3881 #endif
3882 #endif
3883
3884 #ifndef PRODUCT
3885 if (TraceBytecodesAt != 0) {
3886 TraceBytecodes = true;
3887 }
3888 if (CountCompiledCalls) {
3889 if (UseCounterDecay) {
3890 warning("UseCounterDecay disabled because CountCalls is set");
3891 UseCounterDecay = false;
3892 }
3893 }
3894 #endif // PRODUCT
3895
3896 if (ScavengeRootsInCode == 0) {
3897 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3898 warning("forcing ScavengeRootsInCode non-zero");
3899 }
3900 ScavengeRootsInCode = 1;
3901 }
3902
3903 if (PrintGCDetails) {
3904 // Turn on -verbose:gc options as well
3905 PrintGC = true;
3906 }
3907
3908 // Set object alignment values.
3909 set_object_alignment();
3910
3911 #if !INCLUDE_ALL_GCS
3912 force_serial_gc();
3913 #endif // INCLUDE_ALL_GCS
3914 #if !INCLUDE_CDS
3915 if (DumpSharedSpaces || RequireSharedSpaces) {
3916 jio_fprintf(defaultStream::error_stream(),
3917 "Shared spaces are not supported in this VM\n");
3918 return JNI_ERR;
3919 }
3920 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3921 warning("Shared spaces are not supported in this VM");
3922 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3923 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3924 }
3925 no_shared_spaces("CDS Disabled");
3926 #endif // INCLUDE_CDS
3927
3928 return JNI_OK;
3929 }
3930
3931 jint Arguments::apply_ergo() {
3932
3933 // Set flags based on ergonomics.
3934 set_ergonomics_flags();
3935
3936 set_shared_spaces_flags();
3937
3938 // Check the GC selections again.
3939 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3940 return JNI_EINVAL;
3941 }
3942
3943 if (TieredCompilation) {
3944 set_tiered_flags();
3945 } else {
3946 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3947 if (CompilationPolicyChoice >= 2) {
3948 vm_exit_during_initialization(
3949 "Incompatible compilation policy selected", NULL);
3950 }
3951 // Scale CompileThreshold
3952 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3953 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
3954 }
3955 }
3956
3957 #ifdef COMPILER2
3958 #ifndef PRODUCT
3959 if (PrintIdealGraphLevel > 0) {
3960 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3961 }
3962 #endif
3963 #endif
3964
3965 // Set heap size based on available physical memory
3966 set_heap_size();
3967
3968 ArgumentsExt::set_gc_specific_flags();
3969
3970 // Initialize Metaspace flags and alignments
3971 Metaspace::ergo_initialize();
3972
3973 // Set bytecode rewriting flags
3974 set_bytecode_flags();
3975
3976 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3977 set_aggressive_opts_flags();
3978
3979 // Turn off biased locking for locking debug mode flags,
3980 // which are subtly different from each other but neither works with
3981 // biased locking
3982 if (UseHeavyMonitors
3983 #ifdef COMPILER1
3984 || !UseFastLocking
3985 #endif // COMPILER1
3986 ) {
3987 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3988 // flag set to true on command line; warn the user that they
3989 // can't enable biased locking here
3990 warning("Biased Locking is not supported with locking debug flags"
3991 "; ignoring UseBiasedLocking flag." );
3992 }
3993 UseBiasedLocking = false;
3994 }
3995
3996 #ifdef ZERO
3997 // Clear flags not supported on zero.
3998 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3999 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4000 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4001 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4002 #endif // CC_INTERP
4003
4004 #ifdef COMPILER2
4005 if (!EliminateLocks) {
4006 EliminateNestedLocks = false;
4007 }
4008 if (!Inline) {
4009 IncrementalInline = false;
4010 }
4011 #ifndef PRODUCT
4012 if (!IncrementalInline) {
4013 AlwaysIncrementalInline = false;
4014 }
4015 #endif
4016 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4017 // nothing to use the profiling, turn if off
4018 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4019 }
4020 #endif
4021
4022 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4023 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4024 DebugNonSafepoints = true;
4025 }
4026
4027 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4028 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4029 }
4030
4031 #ifndef PRODUCT
4032 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4033 if (use_vm_log()) {
4034 LogVMOutput = true;
4035 }
4036 }
4037 #endif // PRODUCT
4038
4039 if (PrintCommandLineFlags) {
4040 CommandLineFlags::printSetFlags(tty);
4041 }
4042
4043 // Apply CPU specific policy for the BiasedLocking
4044 if (UseBiasedLocking) {
4045 if (!VM_Version::use_biased_locking() &&
4046 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4047 UseBiasedLocking = false;
4048 }
4049 }
4050 #ifdef COMPILER2
4051 if (!UseBiasedLocking || EmitSync != 0) {
4052 UseOptoBiasInlining = false;
4053 }
4054 #endif
4055
4056 return JNI_OK;
4057 }
4058
4059 jint Arguments::adjust_after_os() {
4060 if (UseNUMA) {
4061 if (UseParallelGC || UseParallelOldGC) {
4062 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4063 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4064 }
4065 }
4066 // UseNUMAInterleaving is set to ON for all collectors and
4067 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4068 // such as the parallel collector for Linux and Solaris will
4069 // interleave old gen and survivor spaces on top of NUMA
4070 // allocation policy for the eden space.
4071 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4072 // all platforms and ParallelGC on Windows will interleave all
4073 // of the heap spaces across NUMA nodes.
4074 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4075 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4076 }
4077 }
4078 return JNI_OK;
4079 }
4080
4081 int Arguments::PropertyList_count(SystemProperty* pl) {
4082 int count = 0;
4083 while(pl != NULL) {
4084 count++;
4085 pl = pl->next();
4086 }
4087 return count;
4088 }
4089
4090 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4091 assert(key != NULL, "just checking");
4092 SystemProperty* prop;
4093 for (prop = pl; prop != NULL; prop = prop->next()) {
4094 if (strcmp(key, prop->key()) == 0) return prop->value();
4095 }
4096 return NULL;
4097 }
4098
4099 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4100 int count = 0;
4101 const char* ret_val = NULL;
4102
4103 while(pl != NULL) {
4104 if(count >= index) {
4105 ret_val = pl->key();
4106 break;
4107 }
4108 count++;
4109 pl = pl->next();
4110 }
4111
4112 return ret_val;
4113 }
4114
4115 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4116 int count = 0;
4117 char* ret_val = NULL;
4118
4119 while(pl != NULL) {
4120 if(count >= index) {
4121 ret_val = pl->value();
4122 break;
4123 }
4124 count++;
4125 pl = pl->next();
4126 }
4127
4128 return ret_val;
4129 }
4130
4131 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4132 SystemProperty* p = *plist;
4133 if (p == NULL) {
4134 *plist = new_p;
4135 } else {
4136 while (p->next() != NULL) {
4137 p = p->next();
4138 }
4139 p->set_next(new_p);
4140 }
4141 }
4142
4143 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4144 if (plist == NULL)
4145 return;
4146
4147 SystemProperty* new_p = new SystemProperty(k, v, true);
4148 PropertyList_add(plist, new_p);
4149 }
4150
4151 // This add maintains unique property key in the list.
4152 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4153 if (plist == NULL)
4154 return;
4155
4156 // If property key exist then update with new value.
4157 SystemProperty* prop;
4158 for (prop = *plist; prop != NULL; prop = prop->next()) {
4159 if (strcmp(k, prop->key()) == 0) {
4160 if (append) {
4161 prop->append_value(v);
4162 } else {
4163 prop->set_value(v);
4164 }
4165 return;
4166 }
4167 }
4168
4169 PropertyList_add(plist, k, v);
4170 }
4171
4172 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4173 // Returns true if all of the source pointed by src has been copied over to
4174 // the destination buffer pointed by buf. Otherwise, returns false.
4175 // Notes:
4176 // 1. If the length (buflen) of the destination buffer excluding the
4177 // NULL terminator character is not long enough for holding the expanded
4178 // pid characters, it also returns false instead of returning the partially
4179 // expanded one.
4180 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4181 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4182 char* buf, size_t buflen) {
4183 const char* p = src;
4184 char* b = buf;
4185 const char* src_end = &src[srclen];
4186 char* buf_end = &buf[buflen - 1];
4187
4188 while (p < src_end && b < buf_end) {
4189 if (*p == '%') {
4190 switch (*(++p)) {
4191 case '%': // "%%" ==> "%"
4192 *b++ = *p++;
4193 break;
4194 case 'p': { // "%p" ==> current process id
4195 // buf_end points to the character before the last character so
4196 // that we could write '\0' to the end of the buffer.
4197 size_t buf_sz = buf_end - b + 1;
4198 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4199
4200 // if jio_snprintf fails or the buffer is not long enough to hold
4201 // the expanded pid, returns false.
4202 if (ret < 0 || ret >= (int)buf_sz) {
4203 return false;
4204 } else {
4205 b += ret;
4206 assert(*b == '\0', "fail in copy_expand_pid");
4207 if (p == src_end && b == buf_end + 1) {
4208 // reach the end of the buffer.
4209 return true;
4210 }
4211 }
4212 p++;
4213 break;
4214 }
4215 default :
4216 *b++ = '%';
4217 }
4218 } else {
4219 *b++ = *p++;
4220 }
4221 }
4222 *b = '\0';
4223 return (p == src_end); // return false if not all of the source was copied
4224 }