1 /*
2 * Copyright (c) 1997, 2019, 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/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #if INCLUDE_JFR
48 #include "jfr/jfr.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_linux
51 # include "os_linux.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_solaris
54 # include "os_solaris.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_windows
57 # include "os_windows.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_aix
60 # include "os_aix.inline.hpp"
61 #endif
62 #ifdef TARGET_OS_FAMILY_bsd
63 # include "os_bsd.inline.hpp"
64 #endif
65 #if INCLUDE_ALL_GCS
66 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
67 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
68 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
69 #endif // INCLUDE_ALL_GCS
70
71 // Note: This is a special bug reporting site for the JVM
72 #ifdef VENDOR_URL_VM_BUG
73 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
74 #else
75 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
76 #endif
77 #define DEFAULT_JAVA_LAUNCHER "generic"
78
79 // Disable options not supported in this release, with a warning if they
80 // were explicitly requested on the command-line
81 #define UNSUPPORTED_OPTION(opt, description) \
82 do { \
83 if (opt) { \
84 if (FLAG_IS_CMDLINE(opt)) { \
85 warning(description " is disabled in this release."); \
86 } \
87 FLAG_SET_DEFAULT(opt, false); \
88 } \
89 } while(0)
90
91 #define UNSUPPORTED_GC_OPTION(gc) \
92 do { \
93 if (gc) { \
94 if (FLAG_IS_CMDLINE(gc)) { \
95 warning(#gc " is not supported in this VM. Using Serial GC."); \
96 } \
97 FLAG_SET_DEFAULT(gc, false); \
98 } \
99 } while(0)
100
101 char** Arguments::_jvm_flags_array = NULL;
102 int Arguments::_num_jvm_flags = 0;
103 char** Arguments::_jvm_args_array = NULL;
104 int Arguments::_num_jvm_args = 0;
105 char* Arguments::_java_command = NULL;
106 SystemProperty* Arguments::_system_properties = NULL;
107 const char* Arguments::_gc_log_filename = NULL;
108 bool Arguments::_has_profile = false;
109 size_t Arguments::_conservative_max_heap_alignment = 0;
110 uintx Arguments::_min_heap_size = 0;
111 uintx Arguments::_min_heap_free_ratio = 0;
112 uintx Arguments::_max_heap_free_ratio = 0;
113 Arguments::Mode Arguments::_mode = _mixed;
114 bool Arguments::_java_compiler = false;
115 bool Arguments::_xdebug_mode = false;
116 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
117 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
118 int Arguments::_sun_java_launcher_pid = -1;
119 bool Arguments::_created_by_gamma_launcher = false;
120
121 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
122 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
123 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
124 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
125 bool Arguments::_ClipInlining = ClipInlining;
126
127 char* Arguments::SharedArchivePath = NULL;
128
129 AgentLibraryList Arguments::_libraryList;
130 AgentLibraryList Arguments::_agentList;
131
132 abort_hook_t Arguments::_abort_hook = NULL;
133 exit_hook_t Arguments::_exit_hook = NULL;
134 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
135
136
137 SystemProperty *Arguments::_java_ext_dirs = NULL;
138 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
139 SystemProperty *Arguments::_sun_boot_library_path = NULL;
140 SystemProperty *Arguments::_java_library_path = NULL;
141 SystemProperty *Arguments::_java_home = NULL;
142 SystemProperty *Arguments::_java_class_path = NULL;
143 SystemProperty *Arguments::_sun_boot_class_path = NULL;
144
145 char* Arguments::_meta_index_path = NULL;
146 char* Arguments::_meta_index_dir = NULL;
147
148 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
149
match_option(const JavaVMOption * option,const char * name,const char ** tail)150 static bool match_option(const JavaVMOption *option, const char* name,
151 const char** tail) {
152 int len = (int)strlen(name);
153 if (strncmp(option->optionString, name, len) == 0) {
154 *tail = option->optionString + len;
155 return true;
156 } else {
157 return false;
158 }
159 }
160
161 #if INCLUDE_JFR
162 // return true on failure
match_jfr_option(const JavaVMOption ** option)163 static bool match_jfr_option(const JavaVMOption** option) {
164 assert((*option)->optionString != NULL, "invariant");
165 char* tail = NULL;
166 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
167 return Jfr::on_start_flight_recording_option(option, tail);
168 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
169 return Jfr::on_flight_recorder_option(option, tail);
170 }
171 return false;
172 }
173 #endif
174
logOption(const char * opt)175 static void logOption(const char* opt) {
176 if (PrintVMOptions) {
177 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
178 }
179 }
180
181 // Process java launcher properties.
process_sun_java_launcher_properties(JavaVMInitArgs * args)182 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
183 // See if sun.java.launcher or sun.java.launcher.pid is defined.
184 // Must do this before setting up other system properties,
185 // as some of them may depend on launcher type.
186 for (int index = 0; index < args->nOptions; index++) {
187 const JavaVMOption* option = args->options + index;
188 const char* tail;
189
190 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
191 process_java_launcher_argument(tail, option->extraInfo);
192 continue;
193 }
194 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
195 _sun_java_launcher_pid = atoi(tail);
196 continue;
197 }
198 }
199 }
200
201 // Initialize system properties key and value.
init_system_properties()202 void Arguments::init_system_properties() {
203
204 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
205 "Java Virtual Machine Specification", false));
206 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
208 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
209
210 // following are JVMTI agent writeable properties.
211 // Properties values are set to NULL and they are
212 // os specific they are initialized in os::init_system_properties_values().
213 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
214 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
215 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
216 _java_library_path = new SystemProperty("java.library.path", NULL, true);
217 _java_home = new SystemProperty("java.home", NULL, true);
218 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
219
220 _java_class_path = new SystemProperty("java.class.path", "", true);
221
222 // Add to System Property list.
223 PropertyList_add(&_system_properties, _java_ext_dirs);
224 PropertyList_add(&_system_properties, _java_endorsed_dirs);
225 PropertyList_add(&_system_properties, _sun_boot_library_path);
226 PropertyList_add(&_system_properties, _java_library_path);
227 PropertyList_add(&_system_properties, _java_home);
228 PropertyList_add(&_system_properties, _java_class_path);
229 PropertyList_add(&_system_properties, _sun_boot_class_path);
230
231 // Set OS specific system properties values
232 os::init_system_properties_values();
233 }
234
235
236 // Update/Initialize System properties after JDK version number is known
init_version_specific_system_properties()237 void Arguments::init_version_specific_system_properties() {
238 enum { bufsz = 16 };
239 char buffer[bufsz];
240 const char* spec_vendor = "Sun Microsystems Inc.";
241 uint32_t spec_version = 0;
242
243 if (JDK_Version::is_gte_jdk17x_version()) {
244 spec_vendor = "Oracle Corporation";
245 spec_version = JDK_Version::current().major_version();
246 }
247 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
248
249 PropertyList_add(&_system_properties,
250 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
251 PropertyList_add(&_system_properties,
252 new SystemProperty("java.vm.specification.version", buffer, false));
253 PropertyList_add(&_system_properties,
254 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
255 }
256
257 /**
258 * Provide a slightly more user-friendly way of eliminating -XX flags.
259 * When a flag is eliminated, it can be added to this list in order to
260 * continue accepting this flag on the command-line, while issuing a warning
261 * and ignoring the value. Once the JDK version reaches the 'accept_until'
262 * limit, we flatly refuse to admit the existence of the flag. This allows
263 * a flag to die correctly over JDK releases using HSX.
264 */
265 typedef struct {
266 const char* name;
267 JDK_Version obsoleted_in; // when the flag went away
268 JDK_Version accept_until; // which version to start denying the existence
269 } ObsoleteFlag;
270
271 static ObsoleteFlag obsolete_jvm_flags[] = {
272 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
273 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
274 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
275 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
276 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
277 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
278 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
279 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
280 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
281 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
282 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
283 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
284 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
285 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
286 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
287 { "DefaultInitialRAMFraction",
288 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
289 { "UseDepthFirstScavengeOrder",
290 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
291 { "HandlePromotionFailure",
292 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
293 { "MaxLiveObjectEvacuationRatio",
294 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
295 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
296 { "UseParallelOldGCCompacting",
297 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
298 { "UseParallelDensePrefixUpdate",
299 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
300 { "UseParallelOldGCDensePrefix",
301 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
302 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
303 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
304 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
305 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
306 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
307 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
309 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
312 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
313 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
314 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
315 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
316 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
317 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
318 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
319 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
320 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
321 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
322 { "UseOldInlining", JDK_Version::jdk_update(8, 20), JDK_Version::jdk(10) },
323 { "AutoShutdownNMT", JDK_Version::jdk_update(8, 40), JDK_Version::jdk(10) },
324 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
325 { "SegmentedHeapDumpThreshold", JDK_Version::jdk_update(8, 252), JDK_Version::jdk(10) },
326 #ifdef PRODUCT
327 { "DesiredMethodLimit",
328 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
329 #endif // PRODUCT
330 { NULL, JDK_Version(0), JDK_Version(0) }
331 };
332
333 // Returns true if the flag is obsolete and fits into the range specified
334 // for being ignored. In the case that the flag is ignored, the 'version'
335 // value is filled in with the version number when the flag became
336 // obsolete so that that value can be displayed to the user.
is_newly_obsolete(const char * s,JDK_Version * version)337 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
338 int i = 0;
339 assert(version != NULL, "Must provide a version buffer");
340 while (obsolete_jvm_flags[i].name != NULL) {
341 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
342 // <flag>=xxx form
343 // [-|+]<flag> form
344 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
345 ((s[0] == '+' || s[0] == '-') &&
346 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
347 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
348 *version = flag_status.obsoleted_in;
349 return true;
350 }
351 }
352 i++;
353 }
354 return false;
355 }
356
357 // Constructs the system class path (aka boot class path) from the following
358 // components, in order:
359 //
360 // prefix // from -Xbootclasspath/p:...
361 // endorsed // the expansion of -Djava.endorsed.dirs=...
362 // base // from os::get_system_properties() or -Xbootclasspath=
363 // suffix // from -Xbootclasspath/a:...
364 //
365 // java.endorsed.dirs is a list of directories; any jar or zip files in the
366 // directories are added to the sysclasspath just before the base.
367 //
368 // This could be AllStatic, but it isn't needed after argument processing is
369 // complete.
370 class SysClassPath: public StackObj {
371 public:
372 SysClassPath(const char* base);
373 ~SysClassPath();
374
375 inline void set_base(const char* base);
376 inline void add_prefix(const char* prefix);
377 inline void add_suffix_to_prefix(const char* suffix);
378 inline void add_suffix(const char* suffix);
379 inline void reset_path(const char* base);
380
381 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
382 // property. Must be called after all command-line arguments have been
383 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
384 // combined_path().
385 void expand_endorsed();
386
get_base() const387 inline const char* get_base() const { return _items[_scp_base]; }
get_prefix() const388 inline const char* get_prefix() const { return _items[_scp_prefix]; }
get_suffix() const389 inline const char* get_suffix() const { return _items[_scp_suffix]; }
get_endorsed() const390 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
391
392 // Combine all the components into a single c-heap-allocated string; caller
393 // must free the string if/when no longer needed.
394 char* combined_path();
395
396 private:
397 // Utility routines.
398 static char* add_to_path(const char* path, const char* str, bool prepend);
399 static char* add_jars_to_path(char* path, const char* directory);
400
401 inline void reset_item_at(int index);
402
403 // Array indices for the items that make up the sysclasspath. All except the
404 // base are allocated in the C heap and freed by this class.
405 enum {
406 _scp_prefix, // from -Xbootclasspath/p:...
407 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
408 _scp_base, // the default sysclasspath
409 _scp_suffix, // from -Xbootclasspath/a:...
410 _scp_nitems // the number of items, must be last.
411 };
412
413 const char* _items[_scp_nitems];
414 DEBUG_ONLY(bool _expansion_done;)
415 };
416
SysClassPath(const char * base)417 SysClassPath::SysClassPath(const char* base) {
418 memset(_items, 0, sizeof(_items));
419 _items[_scp_base] = base;
420 DEBUG_ONLY(_expansion_done = false;)
421 }
422
~SysClassPath()423 SysClassPath::~SysClassPath() {
424 // Free everything except the base.
425 for (int i = 0; i < _scp_nitems; ++i) {
426 if (i != _scp_base) reset_item_at(i);
427 }
428 DEBUG_ONLY(_expansion_done = false;)
429 }
430
set_base(const char * base)431 inline void SysClassPath::set_base(const char* base) {
432 _items[_scp_base] = base;
433 }
434
add_prefix(const char * prefix)435 inline void SysClassPath::add_prefix(const char* prefix) {
436 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
437 }
438
add_suffix_to_prefix(const char * suffix)439 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
440 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
441 }
442
add_suffix(const char * suffix)443 inline void SysClassPath::add_suffix(const char* suffix) {
444 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
445 }
446
reset_item_at(int index)447 inline void SysClassPath::reset_item_at(int index) {
448 assert(index < _scp_nitems && index != _scp_base, "just checking");
449 if (_items[index] != NULL) {
450 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
451 _items[index] = NULL;
452 }
453 }
454
reset_path(const char * base)455 inline void SysClassPath::reset_path(const char* base) {
456 // Clear the prefix and suffix.
457 reset_item_at(_scp_prefix);
458 reset_item_at(_scp_suffix);
459 set_base(base);
460 }
461
462 //------------------------------------------------------------------------------
463
expand_endorsed()464 void SysClassPath::expand_endorsed() {
465 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
466
467 const char* path = Arguments::get_property("java.endorsed.dirs");
468 if (path == NULL) {
469 path = Arguments::get_endorsed_dir();
470 assert(path != NULL, "no default for java.endorsed.dirs");
471 }
472
473 char* expanded_path = NULL;
474 const char separator = *os::path_separator();
475 const char* const end = path + strlen(path);
476 while (path < end) {
477 const char* tmp_end = strchr(path, separator);
478 if (tmp_end == NULL) {
479 expanded_path = add_jars_to_path(expanded_path, path);
480 path = end;
481 } else {
482 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
483 memcpy(dirpath, path, tmp_end - path);
484 dirpath[tmp_end - path] = '\0';
485 expanded_path = add_jars_to_path(expanded_path, dirpath);
486 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
487 path = tmp_end + 1;
488 }
489 }
490 _items[_scp_endorsed] = expanded_path;
491 DEBUG_ONLY(_expansion_done = true;)
492 }
493
494 // Combine the bootclasspath elements, some of which may be null, into a single
495 // c-heap-allocated string.
combined_path()496 char* SysClassPath::combined_path() {
497 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
498 assert(_expansion_done, "must call expand_endorsed() first.");
499
500 size_t lengths[_scp_nitems];
501 size_t total_len = 0;
502
503 const char separator = *os::path_separator();
504
505 // Get the lengths.
506 int i;
507 for (i = 0; i < _scp_nitems; ++i) {
508 if (_items[i] != NULL) {
509 lengths[i] = strlen(_items[i]);
510 // Include space for the separator char (or a NULL for the last item).
511 total_len += lengths[i] + 1;
512 }
513 }
514 assert(total_len > 0, "empty sysclasspath not allowed");
515
516 // Copy the _items to a single string.
517 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
518 char* cp_tmp = cp;
519 for (i = 0; i < _scp_nitems; ++i) {
520 if (_items[i] != NULL) {
521 memcpy(cp_tmp, _items[i], lengths[i]);
522 cp_tmp += lengths[i];
523 *cp_tmp++ = separator;
524 }
525 }
526 *--cp_tmp = '\0'; // Replace the extra separator.
527 return cp;
528 }
529
530 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
531 char*
add_to_path(const char * path,const char * str,bool prepend)532 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
533 char *cp;
534
535 assert(str != NULL, "just checking");
536 if (path == NULL) {
537 size_t len = strlen(str) + 1;
538 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
539 memcpy(cp, str, len); // copy the trailing null
540 } else {
541 const char separator = *os::path_separator();
542 size_t old_len = strlen(path);
543 size_t str_len = strlen(str);
544 size_t len = old_len + str_len + 2;
545
546 if (prepend) {
547 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
548 char* cp_tmp = cp;
549 memcpy(cp_tmp, str, str_len);
550 cp_tmp += str_len;
551 *cp_tmp = separator;
552 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
553 FREE_C_HEAP_ARRAY(char, path, mtInternal);
554 } else {
555 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
556 char* cp_tmp = cp + old_len;
557 *cp_tmp = separator;
558 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
559 }
560 }
561 return cp;
562 }
563
564 // Scan the directory and append any jar or zip files found to path.
565 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
add_jars_to_path(char * path,const char * directory)566 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
567 DIR* dir = os::opendir(directory);
568 if (dir == NULL) return path;
569
570 char dir_sep[2] = { '\0', '\0' };
571 size_t directory_len = strlen(directory);
572 const char fileSep = *os::file_separator();
573 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
574
575 /* Scan the directory for jars/zips, appending them to path. */
576 struct dirent *entry;
577 while ((entry = os::readdir(dir)) != NULL) {
578 const char* name = entry->d_name;
579 const char* ext = name + strlen(name) - 4;
580 bool isJarOrZip = ext > name &&
581 (os::file_name_strcmp(ext, ".jar") == 0 ||
582 os::file_name_strcmp(ext, ".zip") == 0);
583 if (isJarOrZip) {
584 size_t length = directory_len + 2 + strlen(name);
585 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
586 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
587 path = add_to_path(path, jarpath, false);
588 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
589 }
590 }
591 os::closedir(dir);
592 return path;
593 }
594
595 // Parses a memory size specification string.
atomull(const char * s,julong * result)596 static bool atomull(const char *s, julong* result) {
597 julong n = 0;
598 int args_read = sscanf(s, JULONG_FORMAT, &n);
599 if (args_read != 1) {
600 return false;
601 }
602 while (*s != '\0' && isdigit(*s)) {
603 s++;
604 }
605 // 4705540: illegal if more characters are found after the first non-digit
606 if (strlen(s) > 1) {
607 return false;
608 }
609 switch (*s) {
610 case 'T': case 't':
611 *result = n * G * K;
612 // Check for overflow.
613 if (*result/((julong)G * K) != n) return false;
614 return true;
615 case 'G': case 'g':
616 *result = n * G;
617 if (*result/G != n) return false;
618 return true;
619 case 'M': case 'm':
620 *result = n * M;
621 if (*result/M != n) return false;
622 return true;
623 case 'K': case 'k':
624 *result = n * K;
625 if (*result/K != n) return false;
626 return true;
627 case '\0':
628 *result = n;
629 return true;
630 default:
631 return false;
632 }
633 }
634
check_memory_size(julong size,julong min_size)635 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
636 if (size < min_size) return arg_too_small;
637 // Check that size will fit in a size_t (only relevant on 32-bit)
638 if (size > max_uintx) return arg_too_big;
639 return arg_in_range;
640 }
641
642 // Describe an argument out of range error
describe_range_error(ArgsRange errcode)643 void Arguments::describe_range_error(ArgsRange errcode) {
644 switch(errcode) {
645 case arg_too_big:
646 jio_fprintf(defaultStream::error_stream(),
647 "The specified size exceeds the maximum "
648 "representable size.\n");
649 break;
650 case arg_too_small:
651 case arg_unreadable:
652 case arg_in_range:
653 // do nothing for now
654 break;
655 default:
656 ShouldNotReachHere();
657 }
658 }
659
set_bool_flag(char * name,bool value,Flag::Flags origin)660 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
661 return CommandLineFlags::boolAtPut(name, &value, origin);
662 }
663
set_fp_numeric_flag(char * name,char * value,Flag::Flags origin)664 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
665 double v;
666 if (sscanf(value, "%lf", &v) != 1) {
667 return false;
668 }
669
670 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
671 return true;
672 }
673 return false;
674 }
675
set_numeric_flag(char * name,char * value,Flag::Flags origin)676 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
677 julong v;
678 intx intx_v;
679 bool is_neg = false;
680 // Check the sign first since atomull() parses only unsigned values.
681 if (*value == '-') {
682 if (!CommandLineFlags::intxAt(name, &intx_v)) {
683 return false;
684 }
685 value++;
686 is_neg = true;
687 }
688 if (!atomull(value, &v)) {
689 return false;
690 }
691 intx_v = (intx) v;
692 if (is_neg) {
693 intx_v = -intx_v;
694 }
695 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
696 return true;
697 }
698 uintx uintx_v = (uintx) v;
699 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
700 return true;
701 }
702 uint64_t uint64_t_v = (uint64_t) v;
703 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
704 return true;
705 }
706 return false;
707 }
708
set_string_flag(char * name,const char * value,Flag::Flags origin)709 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
710 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
711 // Contract: CommandLineFlags always returns a pointer that needs freeing.
712 FREE_C_HEAP_ARRAY(char, value, mtInternal);
713 return true;
714 }
715
append_to_string_flag(char * name,const char * new_value,Flag::Flags origin)716 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
717 const char* old_value = "";
718 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
719 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
720 size_t new_len = strlen(new_value);
721 const char* value;
722 char* free_this_too = NULL;
723 if (old_len == 0) {
724 value = new_value;
725 } else if (new_len == 0) {
726 value = old_value;
727 } else {
728 size_t length = old_len + 1 + new_len + 1;
729 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
730 // each new setting adds another LINE to the switch:
731 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
732 value = buf;
733 free_this_too = buf;
734 }
735 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
736 // CommandLineFlags always returns a pointer that needs freeing.
737 FREE_C_HEAP_ARRAY(char, value, mtInternal);
738 if (free_this_too != NULL) {
739 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
740 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
741 }
742 return true;
743 }
744
parse_argument(const char * arg,Flag::Flags origin)745 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
746
747 // range of acceptable characters spelled out for portability reasons
748 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
749 #define BUFLEN 255
750 char name[BUFLEN+1];
751 char dummy;
752
753 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
754 return set_bool_flag(name, false, origin);
755 }
756 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
757 return set_bool_flag(name, true, origin);
758 }
759
760 char punct;
761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
762 const char* value = strchr(arg, '=') + 1;
763 Flag* flag = Flag::find_flag(name, strlen(name));
764 if (flag != NULL && flag->is_ccstr()) {
765 if (flag->ccstr_accumulates()) {
766 return append_to_string_flag(name, value, origin);
767 } else {
768 if (value[0] == '\0') {
769 value = NULL;
770 }
771 return set_string_flag(name, value, origin);
772 }
773 }
774 }
775
776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
777 const char* value = strchr(arg, '=') + 1;
778 // -XX:Foo:=xxx will reset the string flag to the given value.
779 if (value[0] == '\0') {
780 value = NULL;
781 }
782 return set_string_flag(name, value, origin);
783 }
784
785 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
786 #define SIGNED_NUMBER_RANGE "[-0123456789]"
787 #define NUMBER_RANGE "[0123456789]"
788 char value[BUFLEN + 1];
789 char value2[BUFLEN + 1];
790 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
791 // Looks like a floating-point number -- try again with more lenient format string
792 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
793 return set_fp_numeric_flag(name, value, origin);
794 }
795 }
796
797 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
798 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
799 return set_numeric_flag(name, value, origin);
800 }
801
802 return false;
803 }
804
add_string(char *** bldarray,int * count,const char * arg)805 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
806 assert(bldarray != NULL, "illegal argument");
807
808 if (arg == NULL) {
809 return;
810 }
811
812 int new_count = *count + 1;
813
814 // expand the array and add arg to the last element
815 if (*bldarray == NULL) {
816 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
817 } else {
818 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
819 }
820 (*bldarray)[*count] = strdup(arg);
821 *count = new_count;
822 }
823
build_jvm_args(const char * arg)824 void Arguments::build_jvm_args(const char* arg) {
825 add_string(&_jvm_args_array, &_num_jvm_args, arg);
826 }
827
build_jvm_flags(const char * arg)828 void Arguments::build_jvm_flags(const char* arg) {
829 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
830 }
831
832 // utility function to return a string that concatenates all
833 // strings in a given char** array
build_resource_string(char ** args,int count)834 const char* Arguments::build_resource_string(char** args, int count) {
835 if (args == NULL || count == 0) {
836 return NULL;
837 }
838 size_t length = 0;
839 for (int i = 0; i < count; i++) {
840 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
841 }
842 char* s = NEW_RESOURCE_ARRAY(char, length);
843 char* dst = s;
844 for (int j = 0; j < count; j++) {
845 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
846 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
847 dst += offset;
848 length -= offset;
849 }
850 return (const char*) s;
851 }
852
print_on(outputStream * st)853 void Arguments::print_on(outputStream* st) {
854 st->print_cr("VM Arguments:");
855 if (num_jvm_flags() > 0) {
856 st->print("jvm_flags: "); print_jvm_flags_on(st);
857 }
858 if (num_jvm_args() > 0) {
859 st->print("jvm_args: "); print_jvm_args_on(st);
860 }
861 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
862 if (_java_class_path != NULL) {
863 char* path = _java_class_path->value();
864 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
865 }
866 st->print_cr("Launcher Type: %s", _sun_java_launcher);
867 }
868
print_jvm_flags_on(outputStream * st)869 void Arguments::print_jvm_flags_on(outputStream* st) {
870 if (_num_jvm_flags > 0) {
871 for (int i=0; i < _num_jvm_flags; i++) {
872 st->print("%s ", _jvm_flags_array[i]);
873 }
874 st->cr();
875 }
876 }
877
print_jvm_args_on(outputStream * st)878 void Arguments::print_jvm_args_on(outputStream* st) {
879 if (_num_jvm_args > 0) {
880 for (int i=0; i < _num_jvm_args; i++) {
881 st->print("%s ", _jvm_args_array[i]);
882 }
883 st->cr();
884 }
885 }
886
process_argument(const char * arg,jboolean ignore_unrecognized,Flag::Flags origin)887 bool Arguments::process_argument(const char* arg,
888 jboolean ignore_unrecognized, Flag::Flags origin) {
889
890 JDK_Version since = JDK_Version();
891
892 if (parse_argument(arg, origin) || ignore_unrecognized) {
893 return true;
894 }
895
896 bool has_plus_minus = (*arg == '+' || *arg == '-');
897 const char* const argname = has_plus_minus ? arg + 1 : arg;
898 if (is_newly_obsolete(arg, &since)) {
899 char version[256];
900 since.to_string(version, sizeof(version));
901 warning("ignoring option %s; support was removed in %s", argname, version);
902 return true;
903 }
904
905 // For locked flags, report a custom error message if available.
906 // Otherwise, report the standard unrecognized VM option.
907
908 size_t arg_len;
909 const char* equal_sign = strchr(argname, '=');
910 if (equal_sign == NULL) {
911 arg_len = strlen(argname);
912 } else {
913 arg_len = equal_sign - argname;
914 }
915
916 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
917 if (found_flag != NULL) {
918 char locked_message_buf[BUFLEN];
919 found_flag->get_locked_message(locked_message_buf, BUFLEN);
920 if (strlen(locked_message_buf) == 0) {
921 if (found_flag->is_bool() && !has_plus_minus) {
922 jio_fprintf(defaultStream::error_stream(),
923 "Missing +/- setting for VM option '%s'\n", argname);
924 } else if (!found_flag->is_bool() && has_plus_minus) {
925 jio_fprintf(defaultStream::error_stream(),
926 "Unexpected +/- setting in VM option '%s'\n", argname);
927 } else {
928 jio_fprintf(defaultStream::error_stream(),
929 "Improperly specified VM option '%s'\n", argname);
930 }
931 } else {
932 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
933 }
934 } else {
935 jio_fprintf(defaultStream::error_stream(),
936 "Unrecognized VM option '%s'\n", argname);
937 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
938 if (fuzzy_matched != NULL) {
939 jio_fprintf(defaultStream::error_stream(),
940 "Did you mean '%s%s%s'?\n",
941 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
942 fuzzy_matched->_name,
943 (fuzzy_matched->is_bool()) ? "" : "=<value>");
944 }
945 }
946
947 // allow for commandline "commenting out" options like -XX:#+Verbose
948 return arg[0] == '#';
949 }
950
process_settings_file(const char * file_name,bool should_exist,jboolean ignore_unrecognized)951 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
952 FILE* stream = fopen(file_name, "rb");
953 if (stream == NULL) {
954 if (should_exist) {
955 jio_fprintf(defaultStream::error_stream(),
956 "Could not open settings file %s\n", file_name);
957 return false;
958 } else {
959 return true;
960 }
961 }
962
963 char token[1024];
964 int pos = 0;
965
966 bool in_white_space = true;
967 bool in_comment = false;
968 bool in_quote = false;
969 char quote_c = 0;
970 bool result = true;
971
972 int c = getc(stream);
973 while(c != EOF && pos < (int)(sizeof(token)-1)) {
974 if (in_white_space) {
975 if (in_comment) {
976 if (c == '\n') in_comment = false;
977 } else {
978 if (c == '#') in_comment = true;
979 else if (!isspace(c)) {
980 in_white_space = false;
981 token[pos++] = c;
982 }
983 }
984 } else {
985 if (c == '\n' || (!in_quote && isspace(c))) {
986 // token ends at newline, or at unquoted whitespace
987 // this allows a way to include spaces in string-valued options
988 token[pos] = '\0';
989 logOption(token);
990 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
991 build_jvm_flags(token);
992 pos = 0;
993 in_white_space = true;
994 in_quote = false;
995 } else if (!in_quote && (c == '\'' || c == '"')) {
996 in_quote = true;
997 quote_c = c;
998 } else if (in_quote && (c == quote_c)) {
999 in_quote = false;
1000 } else {
1001 token[pos++] = c;
1002 }
1003 }
1004 c = getc(stream);
1005 }
1006 if (pos > 0) {
1007 token[pos] = '\0';
1008 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1009 build_jvm_flags(token);
1010 }
1011 fclose(stream);
1012 return result;
1013 }
1014
1015 //=============================================================================================================
1016 // Parsing of properties (-D)
1017
get_property(const char * key)1018 const char* Arguments::get_property(const char* key) {
1019 return PropertyList_get_value(system_properties(), key);
1020 }
1021
add_property(const char * prop)1022 bool Arguments::add_property(const char* prop) {
1023 const char* eq = strchr(prop, '=');
1024 char* key;
1025 // ns must be static--its address may be stored in a SystemProperty object.
1026 const static char ns[1] = {0};
1027 char* value = (char *)ns;
1028
1029 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1030 key = AllocateHeap(key_len + 1, mtInternal);
1031 strncpy(key, prop, key_len);
1032 key[key_len] = '\0';
1033
1034 if (eq != NULL) {
1035 size_t value_len = strlen(prop) - key_len - 1;
1036 value = AllocateHeap(value_len + 1, mtInternal);
1037 strncpy(value, &prop[key_len + 1], value_len + 1);
1038 }
1039
1040 if (strcmp(key, "java.compiler") == 0) {
1041 process_java_compiler_argument(value);
1042 FreeHeap(key);
1043 if (eq != NULL) {
1044 FreeHeap(value);
1045 }
1046 return true;
1047 } else if (strcmp(key, "sun.java.command") == 0) {
1048 _java_command = value;
1049
1050 // Record value in Arguments, but let it get passed to Java.
1051 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1052 // launcher.pid property is private and is processed
1053 // in process_sun_java_launcher_properties();
1054 // the sun.java.launcher property is passed on to the java application
1055 FreeHeap(key);
1056 if (eq != NULL) {
1057 FreeHeap(value);
1058 }
1059 return true;
1060 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1061 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1062 // its value without going through the property list or making a Java call.
1063 _java_vendor_url_bug = value;
1064 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1065 PropertyList_unique_add(&_system_properties, key, value, true);
1066 return true;
1067 }
1068 // Create new property and add at the end of the list
1069 PropertyList_unique_add(&_system_properties, key, value);
1070 return true;
1071 }
1072
1073 //===========================================================================================================
1074 // Setting int/mixed/comp mode flags
1075
set_mode_flags(Mode mode)1076 void Arguments::set_mode_flags(Mode mode) {
1077 // Set up default values for all flags.
1078 // If you add a flag to any of the branches below,
1079 // add a default value for it here.
1080 set_java_compiler(false);
1081 _mode = mode;
1082
1083 // Ensure Agent_OnLoad has the correct initial values.
1084 // This may not be the final mode; mode may change later in onload phase.
1085 PropertyList_unique_add(&_system_properties, "java.vm.info",
1086 (char*)VM_Version::vm_info_string(), false);
1087
1088 UseInterpreter = true;
1089 UseCompiler = true;
1090 UseLoopCounter = true;
1091
1092 #ifndef ZERO
1093 // Turn these off for mixed and comp. Leave them on for Zero.
1094 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1095 UseFastAccessorMethods = (mode == _int);
1096 }
1097 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1098 UseFastEmptyMethods = (mode == _int);
1099 }
1100 #endif
1101
1102 // Default values may be platform/compiler dependent -
1103 // use the saved values
1104 ClipInlining = Arguments::_ClipInlining;
1105 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1106 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1107 BackgroundCompilation = Arguments::_BackgroundCompilation;
1108
1109 // Change from defaults based on mode
1110 switch (mode) {
1111 default:
1112 ShouldNotReachHere();
1113 break;
1114 case _int:
1115 UseCompiler = false;
1116 UseLoopCounter = false;
1117 AlwaysCompileLoopMethods = false;
1118 UseOnStackReplacement = false;
1119 break;
1120 case _mixed:
1121 // same as default
1122 break;
1123 case _comp:
1124 UseInterpreter = false;
1125 BackgroundCompilation = false;
1126 ClipInlining = false;
1127 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1128 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1129 // compile a level 4 (C2) and then continue executing it.
1130 if (TieredCompilation) {
1131 Tier3InvokeNotifyFreqLog = 0;
1132 Tier4InvocationThreshold = 0;
1133 }
1134 break;
1135 }
1136 }
1137
1138 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1139 // Conflict: required to use shared spaces (-Xshare:on), but
1140 // incompatible command line options were chosen.
1141
no_shared_spaces(const char * message)1142 static void no_shared_spaces(const char* message) {
1143 if (RequireSharedSpaces) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Class data sharing is inconsistent with other specified options.\n");
1146 vm_exit_during_initialization("Unable to use shared archive.", message);
1147 } else {
1148 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1149 }
1150 }
1151 #endif
1152
set_tiered_flags()1153 void Arguments::set_tiered_flags() {
1154 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1155 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1156 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1157 }
1158 if (CompilationPolicyChoice < 2) {
1159 vm_exit_during_initialization(
1160 "Incompatible compilation policy selected", NULL);
1161 }
1162 // Increase the code cache size - tiered compiles a lot more.
1163 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1164 #ifndef AARCH64
1165 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1166 #else
1167 FLAG_SET_DEFAULT(ReservedCodeCacheSize,
1168 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1169 #endif
1170 }
1171 if (!UseInterpreter) { // -Xcomp
1172 Tier3InvokeNotifyFreqLog = 0;
1173 Tier4InvocationThreshold = 0;
1174 }
1175 }
1176
1177 /**
1178 * Returns the minimum number of compiler threads needed to run the JVM. The following
1179 * configurations are possible.
1180 *
1181 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1182 * compiler threads is 0.
1183 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1184 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1185 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1186 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1187 * C1 can be used, so the minimum number of compiler threads is 1.
1188 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1189 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1190 * the minimum number of compiler threads is 2.
1191 */
get_min_number_of_compiler_threads()1192 int Arguments::get_min_number_of_compiler_threads() {
1193 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1194 return 0; // case 1
1195 #else
1196 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1197 return 1; // case 2 or case 3
1198 }
1199 return 2; // case 4 (tiered)
1200 #endif
1201 }
1202
1203 #if INCLUDE_ALL_GCS
disable_adaptive_size_policy(const char * collector_name)1204 static void disable_adaptive_size_policy(const char* collector_name) {
1205 if (UseAdaptiveSizePolicy) {
1206 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1207 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1208 collector_name);
1209 }
1210 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1211 }
1212 }
1213
set_parnew_gc_flags()1214 void Arguments::set_parnew_gc_flags() {
1215 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1216 "control point invariant");
1217 assert(UseParNewGC, "Error");
1218
1219 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1220 disable_adaptive_size_policy("UseParNewGC");
1221
1222 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1223 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1224 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1225 } else if (ParallelGCThreads == 0) {
1226 jio_fprintf(defaultStream::error_stream(),
1227 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1228 vm_exit(1);
1229 }
1230
1231 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1232 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1233 // we set them to 1024 and 1024.
1234 // See CR 6362902.
1235 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1236 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1237 }
1238 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1239 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1240 }
1241
1242 // AlwaysTenure flag should make ParNew promote all at first collection.
1243 // See CR 6362902.
1244 if (AlwaysTenure) {
1245 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1246 }
1247 // When using compressed oops, we use local overflow stacks,
1248 // rather than using a global overflow list chained through
1249 // the klass word of the object's pre-image.
1250 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1251 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1252 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1253 }
1254 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1255 }
1256 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1257 }
1258
1259 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1260 // sparc/solaris for certain applications, but would gain from
1261 // further optimization and tuning efforts, and would almost
1262 // certainly gain from analysis of platform and environment.
set_cms_and_parnew_gc_flags()1263 void Arguments::set_cms_and_parnew_gc_flags() {
1264 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1265 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1266
1267 // If we are using CMS, we prefer to UseParNewGC,
1268 // unless explicitly forbidden.
1269 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1270 FLAG_SET_ERGO(bool, UseParNewGC, true);
1271 }
1272
1273 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1274 disable_adaptive_size_policy("UseConcMarkSweepGC");
1275
1276 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1277 // as needed.
1278 if (UseParNewGC) {
1279 set_parnew_gc_flags();
1280 }
1281
1282 size_t max_heap = align_size_down(MaxHeapSize,
1283 CardTableRS::ct_max_alignment_constraint());
1284
1285 // Now make adjustments for CMS
1286 intx tenuring_default = (intx)6;
1287 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1288
1289 // Preferred young gen size for "short" pauses:
1290 // upper bound depends on # of threads and NewRatio.
1291 const uintx parallel_gc_threads =
1292 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1293 const size_t preferred_max_new_size_unaligned =
1294 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1295 size_t preferred_max_new_size =
1296 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1297
1298 // Unless explicitly requested otherwise, size young gen
1299 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1300
1301 // If either MaxNewSize or NewRatio is set on the command line,
1302 // assume the user is trying to set the size of the young gen.
1303 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1304
1305 // Set MaxNewSize to our calculated preferred_max_new_size unless
1306 // NewSize was set on the command line and it is larger than
1307 // preferred_max_new_size.
1308 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1309 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1310 } else {
1311 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1312 }
1313 if (PrintGCDetails && Verbose) {
1314 // Too early to use gclog_or_tty
1315 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1316 }
1317
1318 // Code along this path potentially sets NewSize and OldSize
1319 if (PrintGCDetails && Verbose) {
1320 // Too early to use gclog_or_tty
1321 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1322 " initial_heap_size: " SIZE_FORMAT
1323 " max_heap: " SIZE_FORMAT,
1324 min_heap_size(), InitialHeapSize, max_heap);
1325 }
1326 size_t min_new = preferred_max_new_size;
1327 if (FLAG_IS_CMDLINE(NewSize)) {
1328 min_new = NewSize;
1329 }
1330 if (max_heap > min_new && min_heap_size() > min_new) {
1331 // Unless explicitly requested otherwise, make young gen
1332 // at least min_new, and at most preferred_max_new_size.
1333 if (FLAG_IS_DEFAULT(NewSize)) {
1334 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1335 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1336 if (PrintGCDetails && Verbose) {
1337 // Too early to use gclog_or_tty
1338 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1339 }
1340 }
1341 // Unless explicitly requested otherwise, size old gen
1342 // so it's NewRatio x of NewSize.
1343 if (FLAG_IS_DEFAULT(OldSize)) {
1344 if (max_heap > NewSize) {
1345 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1346 if (PrintGCDetails && Verbose) {
1347 // Too early to use gclog_or_tty
1348 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1349 }
1350 }
1351 }
1352 }
1353 }
1354 // Unless explicitly requested otherwise, definitely
1355 // promote all objects surviving "tenuring_default" scavenges.
1356 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1357 FLAG_IS_DEFAULT(SurvivorRatio)) {
1358 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1359 }
1360 // If we decided above (or user explicitly requested)
1361 // `promote all' (via MaxTenuringThreshold := 0),
1362 // prefer minuscule survivor spaces so as not to waste
1363 // space for (non-existent) survivors
1364 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1365 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1366 }
1367 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1368 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1369 // This is done in order to make ParNew+CMS configuration to work
1370 // with YoungPLABSize and OldPLABSize options.
1371 // See CR 6362902.
1372 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1373 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1374 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1375 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1376 // the value (either from the command line or ergonomics) of
1377 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1378 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1379 } else {
1380 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1381 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1382 // we'll let it to take precedence.
1383 jio_fprintf(defaultStream::error_stream(),
1384 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1385 " options are specified for the CMS collector."
1386 " CMSParPromoteBlocksToClaim will take precedence.\n");
1387 }
1388 }
1389 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1390 // OldPLAB sizing manually turned off: Use a larger default setting,
1391 // unless it was manually specified. This is because a too-low value
1392 // will slow down scavenges.
1393 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1394 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1395 }
1396 }
1397 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1398 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1399 // If either of the static initialization defaults have changed, note this
1400 // modification.
1401 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1402 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1403 }
1404
1405 if (PrintGCDetails && Verbose) {
1406 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1407 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1408 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1409 }
1410 }
1411 #endif // INCLUDE_ALL_GCS
1412
set_object_alignment()1413 void set_object_alignment() {
1414 // Object alignment.
1415 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1416 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1417 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1418 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1419 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1420 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1421
1422 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1423 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1424
1425 // Oop encoding heap max
1426 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1427
1428 #if INCLUDE_ALL_GCS
1429 // Set CMS global values
1430 CompactibleFreeListSpace::set_cms_values();
1431 #endif // INCLUDE_ALL_GCS
1432 }
1433
verify_object_alignment()1434 bool verify_object_alignment() {
1435 // Object alignment.
1436 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1437 jio_fprintf(defaultStream::error_stream(),
1438 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1439 (int)ObjectAlignmentInBytes);
1440 return false;
1441 }
1442 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1443 jio_fprintf(defaultStream::error_stream(),
1444 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1445 (int)ObjectAlignmentInBytes, BytesPerLong);
1446 return false;
1447 }
1448 // It does not make sense to have big object alignment
1449 // since a space lost due to alignment will be greater
1450 // then a saved space from compressed oops.
1451 if ((int)ObjectAlignmentInBytes > 256) {
1452 jio_fprintf(defaultStream::error_stream(),
1453 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1454 (int)ObjectAlignmentInBytes);
1455 return false;
1456 }
1457 // In case page size is very small.
1458 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1459 jio_fprintf(defaultStream::error_stream(),
1460 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1461 (int)ObjectAlignmentInBytes, os::vm_page_size());
1462 return false;
1463 }
1464 if(SurvivorAlignmentInBytes == 0) {
1465 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1466 } else {
1467 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1468 jio_fprintf(defaultStream::error_stream(),
1469 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1470 (int)SurvivorAlignmentInBytes);
1471 return false;
1472 }
1473 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1474 jio_fprintf(defaultStream::error_stream(),
1475 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1476 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1477 return false;
1478 }
1479 }
1480 return true;
1481 }
1482
max_heap_for_compressed_oops()1483 size_t Arguments::max_heap_for_compressed_oops() {
1484 // Avoid sign flip.
1485 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1486 // We need to fit both the NULL page and the heap into the memory budget, while
1487 // keeping alignment constraints of the heap. To guarantee the latter, as the
1488 // NULL page is located before the heap, we pad the NULL page to the conservative
1489 // maximum alignment that the GC may ever impose upon the heap.
1490 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1491 _conservative_max_heap_alignment);
1492
1493 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1494 NOT_LP64(ShouldNotReachHere(); return 0);
1495 }
1496
should_auto_select_low_pause_collector()1497 bool Arguments::should_auto_select_low_pause_collector() {
1498 if (UseAutoGCSelectPolicy &&
1499 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1500 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1501 if (PrintGCDetails) {
1502 // Cannot use gclog_or_tty yet.
1503 tty->print_cr("Automatic selection of the low pause collector"
1504 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1505 }
1506 return true;
1507 }
1508 return false;
1509 }
1510
set_use_compressed_oops()1511 void Arguments::set_use_compressed_oops() {
1512 #ifndef ZERO
1513 #ifdef _LP64
1514 // MaxHeapSize is not set up properly at this point, but
1515 // the only value that can override MaxHeapSize if we are
1516 // to use UseCompressedOops is InitialHeapSize.
1517 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1518
1519 if (max_heap_size <= max_heap_for_compressed_oops()) {
1520 #if !defined(COMPILER1) || defined(TIERED)
1521 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1522 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1523 }
1524 #endif
1525 #ifdef _WIN64
1526 if (UseLargePages && UseCompressedOops) {
1527 // Cannot allocate guard pages for implicit checks in indexed addressing
1528 // mode, when large pages are specified on windows.
1529 // This flag could be switched ON if narrow oop base address is set to 0,
1530 // see code in Universe::initialize_heap().
1531 Universe::set_narrow_oop_use_implicit_null_checks(false);
1532 }
1533 #endif // _WIN64
1534 } else {
1535 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1536 warning("Max heap size too large for Compressed Oops");
1537 FLAG_SET_DEFAULT(UseCompressedOops, false);
1538 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1539 }
1540 }
1541 #endif // _LP64
1542 #endif // ZERO
1543 }
1544
1545
1546 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1547 // set_use_compressed_oops().
set_use_compressed_klass_ptrs()1548 void Arguments::set_use_compressed_klass_ptrs() {
1549 #ifndef ZERO
1550 #ifdef _LP64
1551 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1552 if (!UseCompressedOops) {
1553 if (UseCompressedClassPointers) {
1554 warning("UseCompressedClassPointers requires UseCompressedOops");
1555 }
1556 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1557 } else {
1558 // Turn on UseCompressedClassPointers too
1559 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1560 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1561 }
1562 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1563 if (UseCompressedClassPointers) {
1564 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1565 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1566 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1567 }
1568 }
1569 }
1570 #endif // _LP64
1571 #endif // !ZERO
1572 }
1573
set_conservative_max_heap_alignment()1574 void Arguments::set_conservative_max_heap_alignment() {
1575 // The conservative maximum required alignment for the heap is the maximum of
1576 // the alignments imposed by several sources: any requirements from the heap
1577 // itself, the collector policy and the maximum page size we may run the VM
1578 // with.
1579 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1580 #if INCLUDE_ALL_GCS
1581 if (UseParallelGC) {
1582 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1583 } else if (UseG1GC) {
1584 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1585 }
1586 #endif // INCLUDE_ALL_GCS
1587 _conservative_max_heap_alignment = MAX4(heap_alignment,
1588 (size_t)os::vm_allocation_granularity(),
1589 os::max_page_size(),
1590 CollectorPolicy::compute_heap_alignment());
1591 }
1592
select_gc_ergonomically()1593 void Arguments::select_gc_ergonomically() {
1594 if (os::is_server_class_machine()) {
1595 if (should_auto_select_low_pause_collector()) {
1596 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1597 } else {
1598 FLAG_SET_ERGO(bool, UseParallelGC, true);
1599 }
1600 }
1601 }
1602
select_gc()1603 void Arguments::select_gc() {
1604 if (!gc_selected()) {
1605 select_gc_ergonomically();
1606 }
1607 }
1608
set_ergonomics_flags()1609 void Arguments::set_ergonomics_flags() {
1610 select_gc();
1611
1612 #ifdef COMPILER2
1613 // Shared spaces work fine with other GCs but causes bytecode rewriting
1614 // to be disabled, which hurts interpreter performance and decreases
1615 // server performance. When -server is specified, keep the default off
1616 // unless it is asked for. Future work: either add bytecode rewriting
1617 // at link time, or rewrite bytecodes in non-shared methods.
1618 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1619 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1620 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1621 }
1622 #endif
1623
1624 set_conservative_max_heap_alignment();
1625
1626 #ifndef ZERO
1627 #ifdef _LP64
1628 set_use_compressed_oops();
1629
1630 // set_use_compressed_klass_ptrs() must be called after calling
1631 // set_use_compressed_oops().
1632 set_use_compressed_klass_ptrs();
1633
1634 // Also checks that certain machines are slower with compressed oops
1635 // in vm_version initialization code.
1636 #endif // _LP64
1637 #endif // !ZERO
1638 }
1639
set_parallel_gc_flags()1640 void Arguments::set_parallel_gc_flags() {
1641 assert(UseParallelGC || UseParallelOldGC, "Error");
1642 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1643 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1644 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1645 }
1646 FLAG_SET_DEFAULT(UseParallelGC, true);
1647
1648 // If no heap maximum was requested explicitly, use some reasonable fraction
1649 // of the physical memory, up to a maximum of 1GB.
1650 FLAG_SET_DEFAULT(ParallelGCThreads,
1651 Abstract_VM_Version::parallel_worker_threads());
1652 if (ParallelGCThreads == 0) {
1653 jio_fprintf(defaultStream::error_stream(),
1654 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1655 vm_exit(1);
1656 }
1657
1658 if (UseAdaptiveSizePolicy) {
1659 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1660 // unless the user actually sets these flags.
1661 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1662 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1663 _min_heap_free_ratio = MinHeapFreeRatio;
1664 }
1665 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1666 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1667 _max_heap_free_ratio = MaxHeapFreeRatio;
1668 }
1669 }
1670
1671 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1672 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1673 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1674 // See CR 6362902 for details.
1675 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1676 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1677 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1678 }
1679 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1680 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1681 }
1682 }
1683
1684 if (UseParallelOldGC) {
1685 // Par compact uses lower default values since they are treated as
1686 // minimums. These are different defaults because of the different
1687 // interpretation and are not ergonomically set.
1688 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1689 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1690 }
1691 }
1692 }
1693
set_g1_gc_flags()1694 void Arguments::set_g1_gc_flags() {
1695 assert(UseG1GC, "Error");
1696 #ifdef COMPILER1
1697 FastTLABRefill = false;
1698 #endif
1699 FLAG_SET_DEFAULT(ParallelGCThreads,
1700 Abstract_VM_Version::parallel_worker_threads());
1701 if (ParallelGCThreads == 0) {
1702 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1703 }
1704
1705 #if INCLUDE_ALL_GCS
1706 if (G1ConcRefinementThreads == 0) {
1707 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1708 }
1709 #endif
1710
1711 // MarkStackSize will be set (if it hasn't been set by the user)
1712 // when concurrent marking is initialized.
1713 // Its value will be based upon the number of parallel marking threads.
1714 // But we do set the maximum mark stack size here.
1715 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1716 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1717 }
1718
1719 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1720 // In G1, we want the default GC overhead goal to be higher than
1721 // say in PS. So we set it here to 10%. Otherwise the heap might
1722 // be expanded more aggressively than we would like it to. In
1723 // fact, even 10% seems to not be high enough in some cases
1724 // (especially small GC stress tests that the main thing they do
1725 // is allocation). We might consider increase it further.
1726 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1727 }
1728
1729 if (PrintGCDetails && Verbose) {
1730 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1731 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1732 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1733 }
1734 }
1735
1736 #if !INCLUDE_ALL_GCS
1737 #ifdef ASSERT
verify_serial_gc_flags()1738 static bool verify_serial_gc_flags() {
1739 return (UseSerialGC &&
1740 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1741 UseParallelGC || UseParallelOldGC));
1742 }
1743 #endif // ASSERT
1744 #endif // INCLUDE_ALL_GCS
1745
set_gc_specific_flags()1746 void Arguments::set_gc_specific_flags() {
1747 #if INCLUDE_ALL_GCS
1748 // Set per-collector flags
1749 if (UseParallelGC || UseParallelOldGC) {
1750 set_parallel_gc_flags();
1751 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1752 set_cms_and_parnew_gc_flags();
1753 } else if (UseParNewGC) { // Skipped if CMS is set above
1754 set_parnew_gc_flags();
1755 } else if (UseG1GC) {
1756 set_g1_gc_flags();
1757 }
1758 check_deprecated_gcs();
1759 check_deprecated_gc_flags();
1760 if (AssumeMP && !UseSerialGC) {
1761 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1762 warning("If the number of processors is expected to increase from one, then"
1763 " you should configure the number of parallel GC threads appropriately"
1764 " using -XX:ParallelGCThreads=N");
1765 }
1766 }
1767 if (MinHeapFreeRatio == 100) {
1768 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1769 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1770 }
1771
1772 // If class unloading is disabled, also disable concurrent class unloading.
1773 if (!ClassUnloading) {
1774 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1775 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1776 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1777 }
1778 #else // INCLUDE_ALL_GCS
1779 assert(verify_serial_gc_flags(), "SerialGC unset");
1780 #endif // INCLUDE_ALL_GCS
1781 }
1782
limit_by_allocatable_memory(julong limit)1783 julong Arguments::limit_by_allocatable_memory(julong limit) {
1784 julong max_allocatable;
1785 julong result = limit;
1786 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1787 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1788 }
1789 return result;
1790 }
1791
set_heap_size()1792 void Arguments::set_heap_size() {
1793 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1794 // Deprecated flag
1795 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1796 }
1797
1798 julong phys_mem =
1799 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1800 : (julong)MaxRAM;
1801
1802 // Experimental support for CGroup memory limits
1803 if (UseCGroupMemoryLimitForHeap) {
1804 // This is a rough indicator that a CGroup limit may be in force
1805 // for this process
1806 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1807 FILE *fp = fopen(lim_file, "r");
1808 if (fp != NULL) {
1809 julong cgroup_max = 0;
1810 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1811 if (ret == 1 && cgroup_max > 0) {
1812 // If unlimited, cgroup_max will be a very large, but unspecified
1813 // value, so use initial phys_mem as a limit
1814 if (PrintGCDetails && Verbose) {
1815 // Cannot use gclog_or_tty yet.
1816 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1817 JULONG_FORMAT "MB) and initial phys_mem ("
1818 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1819 }
1820 phys_mem = MIN2(cgroup_max, phys_mem);
1821 } else {
1822 warning("Unable to read/parse cgroup memory limit from %s: %s",
1823 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1824 }
1825 fclose(fp);
1826 } else {
1827 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1828 }
1829 }
1830
1831 // Convert Fraction to Precentage values
1832 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1833 !FLAG_IS_DEFAULT(MaxRAMFraction))
1834 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1835
1836 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1837 !FLAG_IS_DEFAULT(MinRAMFraction))
1838 MinRAMPercentage = 100.0 / MinRAMFraction;
1839
1840 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1841 !FLAG_IS_DEFAULT(InitialRAMFraction))
1842 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1843
1844 // If the maximum heap size has not been set with -Xmx,
1845 // then set it as fraction of the size of physical memory,
1846 // respecting the maximum and minimum sizes of the heap.
1847 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1848 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1849 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1850 if (reasonable_min < MaxHeapSize) {
1851 // Small physical memory, so use a minimum fraction of it for the heap
1852 reasonable_max = reasonable_min;
1853 } else {
1854 // Not-small physical memory, so require a heap at least
1855 // as large as MaxHeapSize
1856 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1857 }
1858
1859 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1860 // Limit the heap size to ErgoHeapSizeLimit
1861 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1862 }
1863 if (UseCompressedOops) {
1864 // Limit the heap size to the maximum possible when using compressed oops
1865 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1866 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1867 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1868 // but it should be not less than default MaxHeapSize.
1869 max_coop_heap -= HeapBaseMinAddress;
1870 }
1871 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1872 }
1873 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1874
1875 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1876 // An initial heap size was specified on the command line,
1877 // so be sure that the maximum size is consistent. Done
1878 // after call to limit_by_allocatable_memory because that
1879 // method might reduce the allocation size.
1880 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1881 }
1882
1883 if (PrintGCDetails && Verbose) {
1884 // Cannot use gclog_or_tty yet.
1885 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1886 }
1887 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1888 }
1889
1890 // If the minimum or initial heap_size have not been set or requested to be set
1891 // ergonomically, set them accordingly.
1892 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1893 julong reasonable_minimum = (julong)(OldSize + NewSize);
1894
1895 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1896
1897 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1898
1899 if (InitialHeapSize == 0) {
1900 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1901
1902 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1903 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1904
1905 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1906
1907 if (PrintGCDetails && Verbose) {
1908 // Cannot use gclog_or_tty yet.
1909 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1910 }
1911 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1912 }
1913 // If the minimum heap size has not been set (via -Xms),
1914 // synchronize with InitialHeapSize to avoid errors with the default value.
1915 if (min_heap_size() == 0) {
1916 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1917 if (PrintGCDetails && Verbose) {
1918 // Cannot use gclog_or_tty yet.
1919 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1920 }
1921 }
1922 }
1923 }
1924
1925 // This option inspects the machine and attempts to set various
1926 // parameters to be optimal for long-running, memory allocation
1927 // intensive jobs. It is intended for machines with large
1928 // amounts of cpu and memory.
set_aggressive_heap_flags()1929 jint Arguments::set_aggressive_heap_flags() {
1930 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1931 // VM, but we may not be able to represent the total physical memory
1932 // available (like having 8gb of memory on a box but using a 32bit VM).
1933 // Thus, we need to make sure we're using a julong for intermediate
1934 // calculations.
1935 julong initHeapSize;
1936 julong total_memory = os::physical_memory();
1937
1938 if (total_memory < (julong) 256 * M) {
1939 jio_fprintf(defaultStream::error_stream(),
1940 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1941 vm_exit(1);
1942 }
1943
1944 // The heap size is half of available memory, or (at most)
1945 // all of possible memory less 160mb (leaving room for the OS
1946 // when using ISM). This is the maximum; because adaptive sizing
1947 // is turned on below, the actual space used may be smaller.
1948
1949 initHeapSize = MIN2(total_memory / (julong) 2,
1950 total_memory - (julong) 160 * M);
1951
1952 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1953
1954 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1955 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
1956 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
1957 // Currently the minimum size and the initial heap sizes are the same.
1958 set_min_heap_size(initHeapSize);
1959 }
1960 if (FLAG_IS_DEFAULT(NewSize)) {
1961 // Make the young generation 3/8ths of the total heap.
1962 FLAG_SET_CMDLINE(uintx, NewSize,
1963 ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
1964 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
1965 }
1966
1967 #if defined(_ALLBSD_SOURCE) && !defined(__FreeBSD__) && !defined(__DragonFly__)
1968 // UseLargePages is not yet supported on all BSD.
1969 FLAG_SET_DEFAULT(UseLargePages, true);
1970 #endif
1971
1972 // Increase some data structure sizes for efficiency
1973 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
1974 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
1975 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
1976
1977 // See the OldPLABSize comment below, but replace 'after promotion'
1978 // with 'after copying'. YoungPLABSize is the size of the survivor
1979 // space per-gc-thread buffers. The default is 4kw.
1980 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words
1981
1982 // OldPLABSize is the size of the buffers in the old gen that
1983 // UseParallelGC uses to promote live data that doesn't fit in the
1984 // survivor spaces. At any given time, there's one for each gc thread.
1985 // The default size is 1kw. These buffers are rarely used, since the
1986 // survivor spaces are usually big enough. For specjbb, however, there
1987 // are occasions when there's lots of live data in the young gen
1988 // and we end up promoting some of it. We don't have a definite
1989 // explanation for why bumping OldPLABSize helps, but the theory
1990 // is that a bigger PLAB results in retaining something like the
1991 // original allocation order after promotion, which improves mutator
1992 // locality. A minor effect may be that larger PLABs reduce the
1993 // number of PLAB allocation events during gc. The value of 8kw
1994 // was arrived at by experimenting with specjbb.
1995 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words
1996
1997 // Enable parallel GC and adaptive generation sizing
1998 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
1999
2000 // Encourage steady state memory management
2001 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2002
2003 // This appears to improve mutator locality
2004 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2005
2006 // Get around early Solaris scheduling bug
2007 // (affinity vs other jobs on system)
2008 // but disallow DR and offlining (5008695).
2009 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2010
2011 return JNI_OK;
2012 }
2013
2014 // This must be called after ergonomics because we want bytecode rewriting
2015 // if the server compiler is used, or if UseSharedSpaces is disabled.
set_bytecode_flags()2016 void Arguments::set_bytecode_flags() {
2017 // Better not attempt to store into a read-only space.
2018 if (UseSharedSpaces) {
2019 FLAG_SET_DEFAULT(RewriteBytecodes, false);
2020 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2021 }
2022
2023 if (!RewriteBytecodes) {
2024 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2025 }
2026 }
2027
2028 // Aggressive optimization flags -XX:+AggressiveOpts
set_aggressive_opts_flags()2029 void Arguments::set_aggressive_opts_flags() {
2030 #ifdef COMPILER2
2031 if (AggressiveUnboxing) {
2032 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2033 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2034 } else if (!EliminateAutoBox) {
2035 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2036 AggressiveUnboxing = false;
2037 }
2038 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2039 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2040 } else if (!DoEscapeAnalysis) {
2041 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2042 AggressiveUnboxing = false;
2043 }
2044 }
2045 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2046 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2047 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2048 }
2049 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2050 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2051 }
2052
2053 // Feed the cache size setting into the JDK
2054 char buffer[1024];
2055 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2056 add_property(buffer);
2057 }
2058 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2059 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2060 }
2061 #endif
2062
2063 if (AggressiveOpts) {
2064 // Sample flag setting code
2065 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2066 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2067 // }
2068 }
2069 }
2070
2071 //===========================================================================================================
2072 // Parsing of java.compiler property
2073
process_java_compiler_argument(char * arg)2074 void Arguments::process_java_compiler_argument(char* arg) {
2075 // For backwards compatibility, Djava.compiler=NONE or ""
2076 // causes us to switch to -Xint mode UNLESS -Xdebug
2077 // is also specified.
2078 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2079 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2080 }
2081 }
2082
process_java_launcher_argument(const char * launcher,void * extra_info)2083 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2084 _sun_java_launcher = strdup(launcher);
2085 if (strcmp("gamma", _sun_java_launcher) == 0) {
2086 _created_by_gamma_launcher = true;
2087 }
2088 }
2089
created_by_java_launcher()2090 bool Arguments::created_by_java_launcher() {
2091 assert(_sun_java_launcher != NULL, "property must have value");
2092 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2093 }
2094
created_by_gamma_launcher()2095 bool Arguments::created_by_gamma_launcher() {
2096 return _created_by_gamma_launcher;
2097 }
2098
2099 //===========================================================================================================
2100 // Parsing of main arguments
2101
verify_interval(uintx val,uintx min,uintx max,const char * name)2102 bool Arguments::verify_interval(uintx val, uintx min,
2103 uintx max, const char* name) {
2104 // Returns true iff value is in the inclusive interval [min..max]
2105 // false, otherwise.
2106 if (val >= min && val <= max) {
2107 return true;
2108 }
2109 jio_fprintf(defaultStream::error_stream(),
2110 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2111 " and " UINTX_FORMAT "\n",
2112 name, val, min, max);
2113 return false;
2114 }
2115
verify_min_value(intx val,intx min,const char * name)2116 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2117 // Returns true if given value is at least specified min threshold
2118 // false, otherwise.
2119 if (val >= min ) {
2120 return true;
2121 }
2122 jio_fprintf(defaultStream::error_stream(),
2123 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2124 name, val, min);
2125 return false;
2126 }
2127
verify_percentage(uintx value,const char * name)2128 bool Arguments::verify_percentage(uintx value, const char* name) {
2129 if (is_percentage(value)) {
2130 return true;
2131 }
2132 jio_fprintf(defaultStream::error_stream(),
2133 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2134 name, value);
2135 return false;
2136 }
2137
2138 // check if do gclog rotation
2139 // +UseGCLogFileRotation is a must,
2140 // no gc log rotation when log file not supplied or
2141 // NumberOfGCLogFiles is 0
check_gclog_consistency()2142 void check_gclog_consistency() {
2143 if (UseGCLogFileRotation) {
2144 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2145 jio_fprintf(defaultStream::output_stream(),
2146 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2147 "where num_of_file > 0\n"
2148 "GC log rotation is turned off\n");
2149 UseGCLogFileRotation = false;
2150 }
2151 }
2152
2153 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2154 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2155 jio_fprintf(defaultStream::output_stream(),
2156 "GCLogFileSize changed to minimum 8K\n");
2157 }
2158 }
2159
2160 // This function is called for -Xloggc:<filename>, it can be used
2161 // to check if a given file name(or string) conforms to the following
2162 // specification:
2163 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2164 // %p and %t only allowed once. We only limit usage of filename not path
is_filename_valid(const char * file_name)2165 bool is_filename_valid(const char *file_name) {
2166 const char* p = file_name;
2167 char file_sep = os::file_separator()[0];
2168 const char* cp;
2169 // skip prefix path
2170 for (cp = file_name; *cp != '\0'; cp++) {
2171 if (*cp == '/' || *cp == file_sep) {
2172 p = cp + 1;
2173 }
2174 }
2175
2176 int count_p = 0;
2177 int count_t = 0;
2178 while (*p != '\0') {
2179 if ((*p >= '0' && *p <= '9') ||
2180 (*p >= 'A' && *p <= 'Z') ||
2181 (*p >= 'a' && *p <= 'z') ||
2182 *p == '-' ||
2183 *p == '_' ||
2184 *p == '.') {
2185 p++;
2186 continue;
2187 }
2188 if (*p == '%') {
2189 if(*(p + 1) == 'p') {
2190 p += 2;
2191 count_p ++;
2192 continue;
2193 }
2194 if (*(p + 1) == 't') {
2195 p += 2;
2196 count_t ++;
2197 continue;
2198 }
2199 }
2200 return false;
2201 }
2202 return count_p < 2 && count_t < 2;
2203 }
2204
verify_MinHeapFreeRatio(FormatBuffer<80> & err_msg,uintx min_heap_free_ratio)2205 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2206 if (!is_percentage(min_heap_free_ratio)) {
2207 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2208 return false;
2209 }
2210 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2211 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2212 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2213 MaxHeapFreeRatio);
2214 return false;
2215 }
2216 // This does not set the flag itself, but stores the value in a safe place for later usage.
2217 _min_heap_free_ratio = min_heap_free_ratio;
2218 return true;
2219 }
2220
verify_MaxHeapFreeRatio(FormatBuffer<80> & err_msg,uintx max_heap_free_ratio)2221 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2222 if (!is_percentage(max_heap_free_ratio)) {
2223 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2224 return false;
2225 }
2226 if (max_heap_free_ratio < MinHeapFreeRatio) {
2227 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2228 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2229 MinHeapFreeRatio);
2230 return false;
2231 }
2232 // This does not set the flag itself, but stores the value in a safe place for later usage.
2233 _max_heap_free_ratio = max_heap_free_ratio;
2234 return true;
2235 }
2236
2237 // Check consistency of GC selection
check_gc_consistency()2238 bool Arguments::check_gc_consistency() {
2239 check_gclog_consistency();
2240 bool status = true;
2241 // Ensure that the user has not selected conflicting sets
2242 // of collectors. [Note: this check is merely a user convenience;
2243 // collectors over-ride each other so that only a non-conflicting
2244 // set is selected; however what the user gets is not what they
2245 // may have expected from the combination they asked for. It's
2246 // better to reduce user confusion by not allowing them to
2247 // select conflicting combinations.
2248 uint i = 0;
2249 if (UseSerialGC) i++;
2250 if (UseConcMarkSweepGC || UseParNewGC) i++;
2251 if (UseParallelGC || UseParallelOldGC) i++;
2252 if (UseG1GC) i++;
2253 if (i > 1) {
2254 jio_fprintf(defaultStream::error_stream(),
2255 "Conflicting collector combinations in option list; "
2256 "please refer to the release notes for the combinations "
2257 "allowed\n");
2258 status = false;
2259 }
2260 return status;
2261 }
2262
check_deprecated_gcs()2263 void Arguments::check_deprecated_gcs() {
2264 if (UseConcMarkSweepGC && !UseParNewGC) {
2265 warning("Using the DefNew young collector with the CMS collector is deprecated "
2266 "and will likely be removed in a future release");
2267 }
2268
2269 if (UseParNewGC && !UseConcMarkSweepGC) {
2270 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2271 // set up UseSerialGC properly, so that can't be used in the check here.
2272 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2273 "and will likely be removed in a future release");
2274 }
2275
2276 if (CMSIncrementalMode) {
2277 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2278 }
2279 }
2280
check_deprecated_gc_flags()2281 void Arguments::check_deprecated_gc_flags() {
2282 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2283 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2284 "and will likely be removed in future release");
2285 }
2286 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2287 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2288 "Use MaxRAMFraction instead.");
2289 }
2290 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2291 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2292 }
2293 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2294 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2295 }
2296 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2297 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2298 }
2299 }
2300
2301 // Check stack pages settings
check_stack_pages()2302 bool Arguments::check_stack_pages()
2303 {
2304 bool status = true;
2305 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2306 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2307 // greater stack shadow pages can't generate instruction to bang stack
2308 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2309 return status;
2310 }
2311
2312 // Check the consistency of vm_init_args
check_vm_args_consistency()2313 bool Arguments::check_vm_args_consistency() {
2314 // Method for adding checks for flag consistency.
2315 // The intent is to warn the user of all possible conflicts,
2316 // before returning an error.
2317 // Note: Needs platform-dependent factoring.
2318 bool status = true;
2319
2320 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2321 // builds so the cost of stack banging can be measured.
2322 #if (defined(PRODUCT) && defined(SOLARIS))
2323 if (!UseBoundThreads && !UseStackBanging) {
2324 jio_fprintf(defaultStream::error_stream(),
2325 "-UseStackBanging conflicts with -UseBoundThreads\n");
2326
2327 status = false;
2328 }
2329 #endif
2330
2331 if (TLABRefillWasteFraction == 0) {
2332 jio_fprintf(defaultStream::error_stream(),
2333 "TLABRefillWasteFraction should be a denominator, "
2334 "not " SIZE_FORMAT "\n",
2335 TLABRefillWasteFraction);
2336 status = false;
2337 }
2338
2339 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2340 "AdaptiveSizePolicyWeight");
2341 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2342
2343 // Divide by bucket size to prevent a large size from causing rollover when
2344 // calculating amount of memory needed to be allocated for the String table.
2345 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2346 (max_uintx / StringTable::bucket_size()), "StringTable size");
2347
2348 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2349 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2350
2351 {
2352 // Using "else if" below to avoid printing two error messages if min > max.
2353 // This will also prevent us from reporting both min>100 and max>100 at the
2354 // same time, but that is less annoying than printing two identical errors IMHO.
2355 FormatBuffer<80> err_msg("%s","");
2356 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2357 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2358 status = false;
2359 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2360 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2361 status = false;
2362 }
2363 }
2364
2365 // Min/MaxMetaspaceFreeRatio
2366 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2367 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2368
2369 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2372 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2373 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2374 MinMetaspaceFreeRatio,
2375 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2376 MaxMetaspaceFreeRatio);
2377 status = false;
2378 }
2379
2380 // Trying to keep 100% free is not practical
2381 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2382
2383 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2384 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2385 }
2386
2387 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2388 // Settings to encourage splitting.
2389 if (!FLAG_IS_CMDLINE(NewRatio)) {
2390 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2391 }
2392 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2393 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2394 }
2395 }
2396
2397 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2398 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2399 if (GCTimeLimit == 100) {
2400 // Turn off gc-overhead-limit-exceeded checks
2401 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2402 }
2403
2404 status = status && check_gc_consistency();
2405 status = status && check_stack_pages();
2406
2407 if (CMSIncrementalMode) {
2408 if (!UseConcMarkSweepGC) {
2409 jio_fprintf(defaultStream::error_stream(),
2410 "error: invalid argument combination.\n"
2411 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2412 "selected in order\nto use CMSIncrementalMode.\n");
2413 status = false;
2414 } else {
2415 status = status && verify_percentage(CMSIncrementalDutyCycle,
2416 "CMSIncrementalDutyCycle");
2417 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2418 "CMSIncrementalDutyCycleMin");
2419 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2420 "CMSIncrementalSafetyFactor");
2421 status = status && verify_percentage(CMSIncrementalOffset,
2422 "CMSIncrementalOffset");
2423 status = status && verify_percentage(CMSExpAvgFactor,
2424 "CMSExpAvgFactor");
2425 // If it was not set on the command line, set
2426 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2427 if (CMSInitiatingOccupancyFraction < 0) {
2428 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2429 }
2430 }
2431 }
2432
2433 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2434 // insists that we hold the requisite locks so that the iteration is
2435 // MT-safe. For the verification at start-up and shut-down, we don't
2436 // yet have a good way of acquiring and releasing these locks,
2437 // which are not visible at the CollectedHeap level. We want to
2438 // be able to acquire these locks and then do the iteration rather
2439 // than just disable the lock verification. This will be fixed under
2440 // bug 4788986.
2441 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2442 if (VerifyDuringStartup) {
2443 warning("Heap verification at start-up disabled "
2444 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2445 VerifyDuringStartup = false; // Disable verification at start-up
2446 }
2447
2448 if (VerifyBeforeExit) {
2449 warning("Heap verification at shutdown disabled "
2450 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2451 VerifyBeforeExit = false; // Disable verification at shutdown
2452 }
2453 }
2454
2455 // Note: only executed in non-PRODUCT mode
2456 if (!UseAsyncConcMarkSweepGC &&
2457 (ExplicitGCInvokesConcurrent ||
2458 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2459 jio_fprintf(defaultStream::error_stream(),
2460 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2461 " with -UseAsyncConcMarkSweepGC");
2462 status = false;
2463 }
2464
2465 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2466
2467 #if INCLUDE_ALL_GCS
2468 if (UseG1GC) {
2469 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2470 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2471 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2472
2473 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2474 "InitiatingHeapOccupancyPercent");
2475 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2476 "G1RefProcDrainInterval");
2477 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2478 "G1ConcMarkStepDurationMillis");
2479 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2480 "G1ConcRSHotCardLimit");
2481 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2482 "G1ConcRSLogCacheSize");
2483 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2484 "StringDeduplicationAgeThreshold");
2485 }
2486 if (UseConcMarkSweepGC) {
2487 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2488 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2489 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2490 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2491
2492 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2493
2494 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2495 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2496 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2497
2498 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2499
2500 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2501 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2502
2503 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2504 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2505 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2506
2507 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2508
2509 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2510
2511 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2512 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2513 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2514 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2515 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2516 }
2517
2518 if (UseParallelGC || UseParallelOldGC) {
2519 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2520 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2521
2522 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2523 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2524
2525 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2526 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2527
2528 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2529
2530 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2531 }
2532 #endif // INCLUDE_ALL_GCS
2533
2534 status = status && verify_interval(RefDiscoveryPolicy,
2535 ReferenceProcessor::DiscoveryPolicyMin,
2536 ReferenceProcessor::DiscoveryPolicyMax,
2537 "RefDiscoveryPolicy");
2538
2539 // Limit the lower bound of this flag to 1 as it is used in a division
2540 // expression.
2541 status = status && verify_interval(TLABWasteTargetPercent,
2542 1, 100, "TLABWasteTargetPercent");
2543
2544 status = status && verify_object_alignment();
2545
2546 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2547 "CompressedClassSpaceSize");
2548
2549 status = status && verify_interval(MarkStackSizeMax,
2550 1, (max_jint - 1), "MarkStackSizeMax");
2551 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2552
2553 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2554
2555 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2556
2557 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2558
2559 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2560 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2561
2562 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2563
2564 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2565 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2566 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2567 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2568
2569 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2570 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2571
2572 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2573 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2574 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2575
2576 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2577 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2578
2579 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2580 // just for that, so hardcode here.
2581 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2582 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2583 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2584 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2585
2586 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2587 #ifdef COMPILER1
2588 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2589 #endif
2590
2591 if (PrintNMTStatistics) {
2592 #if INCLUDE_NMT
2593 if (MemTracker::tracking_level() == NMT_off) {
2594 #endif // INCLUDE_NMT
2595 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2596 PrintNMTStatistics = false;
2597 #if INCLUDE_NMT
2598 }
2599 #endif
2600 }
2601
2602 // Need to limit the extent of the padding to reasonable size.
2603 // 8K is well beyond the reasonable HW cache line size, even with the
2604 // aggressive prefetching, while still leaving the room for segregating
2605 // among the distinct pages.
2606 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2607 jio_fprintf(defaultStream::error_stream(),
2608 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2609 ContendedPaddingWidth, 0, 8192);
2610 status = false;
2611 }
2612
2613 // Need to enforce the padding not to break the existing field alignments.
2614 // It is sufficient to check against the largest type size.
2615 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2616 jio_fprintf(defaultStream::error_stream(),
2617 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2618 ContendedPaddingWidth, BytesPerLong);
2619 status = false;
2620 }
2621
2622 // Check lower bounds of the code cache
2623 // Template Interpreter code is approximately 3X larger in debug builds.
2624 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2625 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2626 jio_fprintf(defaultStream::error_stream(),
2627 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2628 os::vm_page_size()/K);
2629 status = false;
2630 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2631 jio_fprintf(defaultStream::error_stream(),
2632 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2633 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2634 status = false;
2635 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2638 min_code_cache_size/K);
2639 status = false;
2640 } else if (ReservedCodeCacheSize > 2*G) {
2641 // Code cache size larger than MAXINT is not supported.
2642 jio_fprintf(defaultStream::error_stream(),
2643 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2644 (2*G)/M);
2645 status = false;
2646 }
2647
2648 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2649 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2650
2651 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2652 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2653 }
2654
2655 #ifdef COMPILER1
2656 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2657 #endif
2658
2659 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2660 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2661 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2662 // Check the minimum number of compiler threads
2663 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2664
2665 return status;
2666 }
2667
is_bad_option(const JavaVMOption * option,jboolean ignore,const char * option_type)2668 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2669 const char* option_type) {
2670 if (ignore) return false;
2671
2672 const char* spacer = " ";
2673 if (option_type == NULL) {
2674 option_type = ++spacer; // Set both to the empty string.
2675 }
2676
2677 if (os::obsolete_option(option)) {
2678 jio_fprintf(defaultStream::error_stream(),
2679 "Obsolete %s%soption: %s\n", option_type, spacer,
2680 option->optionString);
2681 return false;
2682 } else {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Unrecognized %s%soption: %s\n", option_type, spacer,
2685 option->optionString);
2686 return true;
2687 }
2688 }
2689
2690 static const char* user_assertion_options[] = {
2691 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2692 };
2693
2694 static const char* system_assertion_options[] = {
2695 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2696 };
2697
2698 // Return true if any of the strings in null-terminated array 'names' matches.
2699 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2700 // the option must match exactly.
match_option(const JavaVMOption * option,const char ** names,const char ** tail,bool tail_allowed)2701 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2702 bool tail_allowed) {
2703 for (/* empty */; *names != NULL; ++names) {
2704 if (match_option(option, *names, tail)) {
2705 if (**tail == '\0' || tail_allowed && **tail == ':') {
2706 return true;
2707 }
2708 }
2709 }
2710 return false;
2711 }
2712
parse_uintx(const char * value,uintx * uintx_arg,uintx min_size)2713 bool Arguments::parse_uintx(const char* value,
2714 uintx* uintx_arg,
2715 uintx min_size) {
2716
2717 // Check the sign first since atomull() parses only unsigned values.
2718 bool value_is_positive = !(*value == '-');
2719
2720 if (value_is_positive) {
2721 julong n;
2722 bool good_return = atomull(value, &n);
2723 if (good_return) {
2724 bool above_minimum = n >= min_size;
2725 bool value_is_too_large = n > max_uintx;
2726
2727 if (above_minimum && !value_is_too_large) {
2728 *uintx_arg = n;
2729 return true;
2730 }
2731 }
2732 }
2733 return false;
2734 }
2735
parse_memory_size(const char * s,julong * long_arg,julong min_size)2736 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2737 julong* long_arg,
2738 julong min_size) {
2739 if (!atomull(s, long_arg)) return arg_unreadable;
2740 return check_memory_size(*long_arg, min_size);
2741 }
2742
2743 // Parse JavaVMInitArgs structure
2744
parse_vm_init_args(const JavaVMInitArgs * args)2745 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2746 // For components of the system classpath.
2747 SysClassPath scp(Arguments::get_sysclasspath());
2748 bool scp_assembly_required = false;
2749
2750 // Save default settings for some mode flags
2751 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2752 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2753 Arguments::_ClipInlining = ClipInlining;
2754 Arguments::_BackgroundCompilation = BackgroundCompilation;
2755
2756 // Setup flags for mixed which is the default
2757 set_mode_flags(_mixed);
2758
2759 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2760 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2761 if (result != JNI_OK) {
2762 return result;
2763 }
2764
2765 // Parse JavaVMInitArgs structure passed in
2766 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2767 if (result != JNI_OK) {
2768 return result;
2769 }
2770
2771 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2772 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2773 if (result != JNI_OK) {
2774 return result;
2775 }
2776
2777 // We need to ensure processor and memory resources have been properly
2778 // configured - which may rely on arguments we just processed - before
2779 // doing the final argument processing. Any argument processing that
2780 // needs to know about processor and memory resources must occur after
2781 // this point.
2782
2783 os::init_container_support();
2784
2785 // Do final processing now that all arguments have been parsed
2786 result = finalize_vm_init_args(&scp, scp_assembly_required);
2787 if (result != JNI_OK) {
2788 return result;
2789 }
2790
2791 return JNI_OK;
2792 }
2793
2794 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2795 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2796 // are dealing with -agentpath (case where name is a path), otherwise with
2797 // -agentlib
valid_hprof_or_jdwp_agent(char * name,bool is_path)2798 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2799 char *_name;
2800 const char *_hprof = "hprof", *_jdwp = "jdwp";
2801 size_t _len_hprof, _len_jdwp, _len_prefix;
2802
2803 if (is_path) {
2804 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2805 return false;
2806 }
2807
2808 _name++; // skip past last path separator
2809 _len_prefix = strlen(JNI_LIB_PREFIX);
2810
2811 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2812 return false;
2813 }
2814
2815 _name += _len_prefix;
2816 _len_hprof = strlen(_hprof);
2817 _len_jdwp = strlen(_jdwp);
2818
2819 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2820 _name += _len_hprof;
2821 }
2822 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2823 _name += _len_jdwp;
2824 }
2825 else {
2826 return false;
2827 }
2828
2829 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2830 return false;
2831 }
2832
2833 return true;
2834 }
2835
2836 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2837 return true;
2838 }
2839
2840 return false;
2841 }
2842
parse_each_vm_init_arg(const JavaVMInitArgs * args,SysClassPath * scp_p,bool * scp_assembly_required_p,Flag::Flags origin)2843 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2844 SysClassPath* scp_p,
2845 bool* scp_assembly_required_p,
2846 Flag::Flags origin) {
2847 // Remaining part of option string
2848 const char* tail;
2849
2850 // iterate over arguments
2851 for (int index = 0; index < args->nOptions; index++) {
2852 bool is_absolute_path = false; // for -agentpath vs -agentlib
2853
2854 const JavaVMOption* option = args->options + index;
2855
2856 if (!match_option(option, "-Djava.class.path", &tail) &&
2857 !match_option(option, "-Dsun.java.command", &tail) &&
2858 !match_option(option, "-Dsun.java.launcher", &tail)) {
2859
2860 // add all jvm options to the jvm_args string. This string
2861 // is used later to set the java.vm.args PerfData string constant.
2862 // the -Djava.class.path and the -Dsun.java.command options are
2863 // omitted from jvm_args string as each have their own PerfData
2864 // string constant object.
2865 build_jvm_args(option->optionString);
2866 }
2867
2868 // -verbose:[class/gc/jni]
2869 if (match_option(option, "-verbose", &tail)) {
2870 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2871 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2872 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2873 } else if (!strcmp(tail, ":gc")) {
2874 FLAG_SET_CMDLINE(bool, PrintGC, true);
2875 } else if (!strcmp(tail, ":jni")) {
2876 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2877 }
2878 // -da / -ea / -disableassertions / -enableassertions
2879 // These accept an optional class/package name separated by a colon, e.g.,
2880 // -da:java.lang.Thread.
2881 } else if (match_option(option, user_assertion_options, &tail, true)) {
2882 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2883 if (*tail == '\0') {
2884 JavaAssertions::setUserClassDefault(enable);
2885 } else {
2886 assert(*tail == ':', "bogus match by match_option()");
2887 JavaAssertions::addOption(tail + 1, enable);
2888 }
2889 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2890 } else if (match_option(option, system_assertion_options, &tail, false)) {
2891 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2892 JavaAssertions::setSystemClassDefault(enable);
2893 // -bootclasspath:
2894 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2895 scp_p->reset_path(tail);
2896 *scp_assembly_required_p = true;
2897 // -bootclasspath/a:
2898 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2899 scp_p->add_suffix(tail);
2900 *scp_assembly_required_p = true;
2901 // -bootclasspath/p:
2902 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2903 scp_p->add_prefix(tail);
2904 *scp_assembly_required_p = true;
2905 // -Xrun
2906 } else if (match_option(option, "-Xrun", &tail)) {
2907 if (tail != NULL) {
2908 const char* pos = strchr(tail, ':');
2909 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2910 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2911 name[len] = '\0';
2912
2913 char *options = NULL;
2914 if(pos != NULL) {
2915 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2916 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2917 }
2918 #if !INCLUDE_JVMTI
2919 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2920 jio_fprintf(defaultStream::error_stream(),
2921 "Profiling and debugging agents are not supported in this VM\n");
2922 return JNI_ERR;
2923 }
2924 #endif // !INCLUDE_JVMTI
2925 add_init_library(name, options);
2926 }
2927 // -agentlib and -agentpath
2928 } else if (match_option(option, "-agentlib:", &tail) ||
2929 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2930 if(tail != NULL) {
2931 const char* pos = strchr(tail, '=');
2932 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2933 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2934 name[len] = '\0';
2935
2936 char *options = NULL;
2937 if(pos != NULL) {
2938 size_t length = strlen(pos + 1) + 1;
2939 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2940 jio_snprintf(options, length, "%s", pos + 1);
2941 }
2942 #if !INCLUDE_JVMTI
2943 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2944 jio_fprintf(defaultStream::error_stream(),
2945 "Profiling and debugging agents are not supported in this VM\n");
2946 return JNI_ERR;
2947 }
2948 #endif // !INCLUDE_JVMTI
2949 add_init_agent(name, options, is_absolute_path);
2950 }
2951 // -javaagent
2952 } else if (match_option(option, "-javaagent:", &tail)) {
2953 #if !INCLUDE_JVMTI
2954 jio_fprintf(defaultStream::error_stream(),
2955 "Instrumentation agents are not supported in this VM\n");
2956 return JNI_ERR;
2957 #else
2958 if(tail != NULL) {
2959 size_t length = strlen(tail) + 1;
2960 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2961 jio_snprintf(options, length, "%s", tail);
2962 add_init_agent("instrument", options, false);
2963 }
2964 #endif // !INCLUDE_JVMTI
2965 // -Xnoclassgc
2966 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2967 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2968 // -Xincgc: i-CMS
2969 } else if (match_option(option, "-Xincgc", &tail)) {
2970 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2971 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2972 // -Xnoincgc: no i-CMS
2973 } else if (match_option(option, "-Xnoincgc", &tail)) {
2974 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2975 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2976 // -Xconcgc
2977 } else if (match_option(option, "-Xconcgc", &tail)) {
2978 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2979 // -Xnoconcgc
2980 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2981 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2982 // -Xbatch
2983 } else if (match_option(option, "-Xbatch", &tail)) {
2984 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2985 // -Xmn for compatibility with other JVM vendors
2986 } else if (match_option(option, "-Xmn", &tail)) {
2987 julong long_initial_young_size = 0;
2988 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2989 if (errcode != arg_in_range) {
2990 jio_fprintf(defaultStream::error_stream(),
2991 "Invalid initial young generation size: %s\n", option->optionString);
2992 describe_range_error(errcode);
2993 return JNI_EINVAL;
2994 }
2995 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2996 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2997 // -Xms
2998 } else if (match_option(option, "-Xms", &tail)) {
2999 julong long_initial_heap_size = 0;
3000 // an initial heap size of 0 means automatically determine
3001 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3002 if (errcode != arg_in_range) {
3003 jio_fprintf(defaultStream::error_stream(),
3004 "Invalid initial heap size: %s\n", option->optionString);
3005 describe_range_error(errcode);
3006 return JNI_EINVAL;
3007 }
3008 set_min_heap_size((uintx)long_initial_heap_size);
3009 // Currently the minimum size and the initial heap sizes are the same.
3010 // Can be overridden with -XX:InitialHeapSize.
3011 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
3012 // -Xmx
3013 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3014 julong long_max_heap_size = 0;
3015 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3016 if (errcode != arg_in_range) {
3017 jio_fprintf(defaultStream::error_stream(),
3018 "Invalid maximum heap size: %s\n", option->optionString);
3019 describe_range_error(errcode);
3020 return JNI_EINVAL;
3021 }
3022 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3023 // Xmaxf
3024 } else if (match_option(option, "-Xmaxf", &tail)) {
3025 char* err;
3026 int maxf = (int)(strtod(tail, &err) * 100);
3027 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3028 jio_fprintf(defaultStream::error_stream(),
3029 "Bad max heap free percentage size: %s\n",
3030 option->optionString);
3031 return JNI_EINVAL;
3032 } else {
3033 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3034 }
3035 // Xminf
3036 } else if (match_option(option, "-Xminf", &tail)) {
3037 char* err;
3038 int minf = (int)(strtod(tail, &err) * 100);
3039 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Bad min heap free percentage size: %s\n",
3042 option->optionString);
3043 return JNI_EINVAL;
3044 } else {
3045 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3046 }
3047 // -Xss
3048 } else if (match_option(option, "-Xss", &tail)) {
3049 julong long_ThreadStackSize = 0;
3050 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3051 if (errcode != arg_in_range) {
3052 jio_fprintf(defaultStream::error_stream(),
3053 "Invalid thread stack size: %s\n", option->optionString);
3054 describe_range_error(errcode);
3055 return JNI_EINVAL;
3056 }
3057 // Internally track ThreadStackSize in units of 1024 bytes.
3058 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3059 round_to((int)long_ThreadStackSize, K) / K);
3060 // -Xoss
3061 } else if (match_option(option, "-Xoss", &tail)) {
3062 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3063 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3064 julong long_CodeCacheExpansionSize = 0;
3065 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3066 if (errcode != arg_in_range) {
3067 jio_fprintf(defaultStream::error_stream(),
3068 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3069 os::vm_page_size()/K);
3070 return JNI_EINVAL;
3071 }
3072 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3073 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3074 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3075 julong long_ReservedCodeCacheSize = 0;
3076
3077 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3078 if (errcode != arg_in_range) {
3079 jio_fprintf(defaultStream::error_stream(),
3080 "Invalid maximum code cache size: %s.\n", option->optionString);
3081 return JNI_EINVAL;
3082 }
3083 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3084 //-XX:IncreaseFirstTierCompileThresholdAt=
3085 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3086 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3087 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3090 option->optionString);
3091 return JNI_EINVAL;
3092 }
3093 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3094 // -green
3095 } else if (match_option(option, "-green", &tail)) {
3096 jio_fprintf(defaultStream::error_stream(),
3097 "Green threads support not available\n");
3098 return JNI_EINVAL;
3099 // -native
3100 } else if (match_option(option, "-native", &tail)) {
3101 // HotSpot always uses native threads, ignore silently for compatibility
3102 // -Xsqnopause
3103 } else if (match_option(option, "-Xsqnopause", &tail)) {
3104 // EVM option, ignore silently for compatibility
3105 // -Xrs
3106 } else if (match_option(option, "-Xrs", &tail)) {
3107 // Classic/EVM option, new functionality
3108 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3109 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3110 // change default internal VM signals used - lower case for back compat
3111 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3112 // -Xoptimize
3113 } else if (match_option(option, "-Xoptimize", &tail)) {
3114 // EVM option, ignore silently for compatibility
3115 // -Xprof
3116 } else if (match_option(option, "-Xprof", &tail)) {
3117 #if INCLUDE_FPROF
3118 _has_profile = true;
3119 #else // INCLUDE_FPROF
3120 jio_fprintf(defaultStream::error_stream(),
3121 "Flat profiling is not supported in this VM.\n");
3122 return JNI_ERR;
3123 #endif // INCLUDE_FPROF
3124 // -Xconcurrentio
3125 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3126 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3127 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3128 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3129 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3130 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3131
3132 // -Xinternalversion
3133 } else if (match_option(option, "-Xinternalversion", &tail)) {
3134 jio_fprintf(defaultStream::output_stream(), "%s\n",
3135 VM_Version::internal_vm_info_string());
3136 vm_exit(0);
3137 #ifndef PRODUCT
3138 // -Xprintflags
3139 } else if (match_option(option, "-Xprintflags", &tail)) {
3140 CommandLineFlags::printFlags(tty, false);
3141 vm_exit(0);
3142 #endif
3143 // -D
3144 } else if (match_option(option, "-D", &tail)) {
3145 if (CheckEndorsedAndExtDirs) {
3146 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3147 // abort if -Djava.endorsed.dirs is set
3148 jio_fprintf(defaultStream::output_stream(),
3149 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3150 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3151 return JNI_EINVAL;
3152 }
3153 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3154 // abort if -Djava.ext.dirs is set
3155 jio_fprintf(defaultStream::output_stream(),
3156 "-Djava.ext.dirs will not be supported in a future release.\n"
3157 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3158 return JNI_EINVAL;
3159 }
3160 }
3161
3162 if (!add_property(tail)) {
3163 return JNI_ENOMEM;
3164 }
3165 // Out of the box management support
3166 if (match_option(option, "-Dcom.sun.management", &tail)) {
3167 #if INCLUDE_MANAGEMENT
3168 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3169 #else
3170 jio_fprintf(defaultStream::output_stream(),
3171 "-Dcom.sun.management is not supported in this VM.\n");
3172 return JNI_ERR;
3173 #endif
3174 }
3175 // -Xint
3176 } else if (match_option(option, "-Xint", &tail)) {
3177 set_mode_flags(_int);
3178 // -Xmixed
3179 } else if (match_option(option, "-Xmixed", &tail)) {
3180 set_mode_flags(_mixed);
3181 // -Xcomp
3182 } else if (match_option(option, "-Xcomp", &tail)) {
3183 // for testing the compiler; turn off all flags that inhibit compilation
3184 set_mode_flags(_comp);
3185 // -Xshare:dump
3186 } else if (match_option(option, "-Xshare:dump", &tail)) {
3187 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3188 set_mode_flags(_int); // Prevent compilation, which creates objects
3189 // -Xshare:on
3190 } else if (match_option(option, "-Xshare:on", &tail)) {
3191 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3192 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3193 // -Xshare:auto
3194 } else if (match_option(option, "-Xshare:auto", &tail)) {
3195 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3196 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3197 // -Xshare:off
3198 } else if (match_option(option, "-Xshare:off", &tail)) {
3199 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3200 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3201 // -Xverify
3202 } else if (match_option(option, "-Xverify", &tail)) {
3203 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3204 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3205 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3206 } else if (strcmp(tail, ":remote") == 0) {
3207 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3208 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3209 } else if (strcmp(tail, ":none") == 0) {
3210 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3211 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3212 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3213 return JNI_EINVAL;
3214 }
3215 // -Xdebug
3216 } else if (match_option(option, "-Xdebug", &tail)) {
3217 // note this flag has been used, then ignore
3218 set_xdebug_mode(true);
3219 // -Xnoagent
3220 } else if (match_option(option, "-Xnoagent", &tail)) {
3221 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3222 } else if (match_option(option, "-Xboundthreads", &tail)) {
3223 // Bind user level threads to kernel threads (Solaris only)
3224 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3225 } else if (match_option(option, "-Xloggc:", &tail)) {
3226 // Redirect GC output to the file. -Xloggc:<filename>
3227 // ostream_init_log(), when called will use this filename
3228 // to initialize a fileStream.
3229 _gc_log_filename = strdup(tail);
3230 if (!is_filename_valid(_gc_log_filename)) {
3231 jio_fprintf(defaultStream::output_stream(),
3232 "Invalid file name for use with -Xloggc: Filename can only contain the "
3233 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3234 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3235 return JNI_EINVAL;
3236 }
3237 FLAG_SET_CMDLINE(bool, PrintGC, true);
3238 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3239
3240 // JNI hooks
3241 } else if (match_option(option, "-Xcheck", &tail)) {
3242 if (!strcmp(tail, ":jni")) {
3243 #if !INCLUDE_JNI_CHECK
3244 warning("JNI CHECKING is not supported in this VM");
3245 #else
3246 CheckJNICalls = true;
3247 #endif // INCLUDE_JNI_CHECK
3248 } else if (is_bad_option(option, args->ignoreUnrecognized,
3249 "check")) {
3250 return JNI_EINVAL;
3251 }
3252 } else if (match_option(option, "vfprintf", &tail)) {
3253 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3254 } else if (match_option(option, "exit", &tail)) {
3255 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3256 } else if (match_option(option, "abort", &tail)) {
3257 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3258 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3259 // The last option must always win.
3260 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3261 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3262 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3263 // The last option must always win.
3264 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3265 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3266 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3267 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3268 jio_fprintf(defaultStream::error_stream(),
3269 "Please use CMSClassUnloadingEnabled in place of "
3270 "CMSPermGenSweepingEnabled in the future\n");
3271 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3272 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Please use -XX:+UseGCOverheadLimit in place of "
3275 "-XX:+UseGCTimeLimit in the future\n");
3276 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3277 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3278 jio_fprintf(defaultStream::error_stream(),
3279 "Please use -XX:-UseGCOverheadLimit in place of "
3280 "-XX:-UseGCTimeLimit in the future\n");
3281 // The TLE options are for compatibility with 1.3 and will be
3282 // removed without notice in a future release. These options
3283 // are not to be documented.
3284 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3285 // No longer used.
3286 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3287 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3288 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3289 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3290 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3291 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3292 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3293 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3294 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3295 // No longer used.
3296 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3297 julong long_tlab_size = 0;
3298 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3299 if (errcode != arg_in_range) {
3300 jio_fprintf(defaultStream::error_stream(),
3301 "Invalid TLAB size: %s\n", option->optionString);
3302 describe_range_error(errcode);
3303 return JNI_EINVAL;
3304 }
3305 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3306 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3307 // No longer used.
3308 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3309 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3310 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3311 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3312 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3313 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3314 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3315 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3316 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3317 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3318 } else if (match_option(option, "-XX:+ErrorFileToStderr", &tail)) {
3319 FLAG_SET_CMDLINE(bool, ErrorFileToStdout, false);
3320 FLAG_SET_CMDLINE(bool, ErrorFileToStderr, true);
3321 } else if (match_option(option, "-XX:+ErrorFileToStdout", &tail)) {
3322 FLAG_SET_CMDLINE(bool, ErrorFileToStderr, false);
3323 FLAG_SET_CMDLINE(bool, ErrorFileToStdout, true);
3324 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3325 #if defined(DTRACE_ENABLED)
3326 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3327 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3328 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3329 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3330 #else // defined(DTRACE_ENABLED)
3331 jio_fprintf(defaultStream::error_stream(),
3332 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3333 return JNI_EINVAL;
3334 #endif // defined(DTRACE_ENABLED)
3335 #ifdef ASSERT
3336 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3337 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3338 // disable scavenge before parallel mark-compact
3339 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3340 #endif
3341 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3342 julong cms_blocks_to_claim = (julong)atol(tail);
3343 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3344 jio_fprintf(defaultStream::error_stream(),
3345 "Please use -XX:OldPLABSize in place of "
3346 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3347 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3348 julong cms_blocks_to_claim = (julong)atol(tail);
3349 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3350 jio_fprintf(defaultStream::error_stream(),
3351 "Please use -XX:OldPLABSize in place of "
3352 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3353 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3354 julong old_plab_size = 0;
3355 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3356 if (errcode != arg_in_range) {
3357 jio_fprintf(defaultStream::error_stream(),
3358 "Invalid old PLAB size: %s\n", option->optionString);
3359 describe_range_error(errcode);
3360 return JNI_EINVAL;
3361 }
3362 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3363 jio_fprintf(defaultStream::error_stream(),
3364 "Please use -XX:OldPLABSize in place of "
3365 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3366 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3367 julong young_plab_size = 0;
3368 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3369 if (errcode != arg_in_range) {
3370 jio_fprintf(defaultStream::error_stream(),
3371 "Invalid young PLAB size: %s\n", option->optionString);
3372 describe_range_error(errcode);
3373 return JNI_EINVAL;
3374 }
3375 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3376 jio_fprintf(defaultStream::error_stream(),
3377 "Please use -XX:YoungPLABSize in place of "
3378 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3379 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3380 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3381 julong stack_size = 0;
3382 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3383 if (errcode != arg_in_range) {
3384 jio_fprintf(defaultStream::error_stream(),
3385 "Invalid mark stack size: %s\n", option->optionString);
3386 describe_range_error(errcode);
3387 return JNI_EINVAL;
3388 }
3389 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3390 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3391 julong max_stack_size = 0;
3392 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3393 if (errcode != arg_in_range) {
3394 jio_fprintf(defaultStream::error_stream(),
3395 "Invalid maximum mark stack size: %s\n",
3396 option->optionString);
3397 describe_range_error(errcode);
3398 return JNI_EINVAL;
3399 }
3400 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3401 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3402 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3403 uintx conc_threads = 0;
3404 if (!parse_uintx(tail, &conc_threads, 1)) {
3405 jio_fprintf(defaultStream::error_stream(),
3406 "Invalid concurrent threads: %s\n", option->optionString);
3407 return JNI_EINVAL;
3408 }
3409 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3410 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3411 julong max_direct_memory_size = 0;
3412 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3413 if (errcode != arg_in_range) {
3414 jio_fprintf(defaultStream::error_stream(),
3415 "Invalid maximum direct memory size: %s\n",
3416 option->optionString);
3417 describe_range_error(errcode);
3418 return JNI_EINVAL;
3419 }
3420 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3421 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3422 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3423 // away and will cause VM initialization failures!
3424 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3425 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3426 #if !INCLUDE_MANAGEMENT
3427 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3428 jio_fprintf(defaultStream::error_stream(),
3429 "ManagementServer is not supported in this VM.\n");
3430 return JNI_ERR;
3431 #endif // INCLUDE_MANAGEMENT
3432 #if INCLUDE_JFR
3433 } else if (match_jfr_option(&option)) {
3434 return JNI_EINVAL;
3435 #endif
3436 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3437 // Skip -XX:Flags= since that case has already been handled
3438 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3439 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3440 return JNI_EINVAL;
3441 }
3442 }
3443 // Unknown option
3444 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3445 return JNI_ERR;
3446 }
3447 }
3448
3449 // PrintSharedArchiveAndExit will turn on
3450 // -Xshare:on
3451 // -XX:+TraceClassPaths
3452 if (PrintSharedArchiveAndExit) {
3453 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3454 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3455 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3456 }
3457
3458 // Change the default value for flags which have different default values
3459 // when working with older JDKs.
3460 #ifdef LINUX
3461 if (JDK_Version::current().compare_major(6) <= 0 &&
3462 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3463 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3464 }
3465 #endif // LINUX
3466 fix_appclasspath();
3467 return JNI_OK;
3468 }
3469
3470 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3471 //
3472 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3473 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3474 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3475 // path is treated as the current directory.
3476 //
3477 // This causes problems with CDS, which requires that all directories specified in the classpath
3478 // must be empty. In most cases, applications do NOT want to load classes from the current
3479 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3480 // scripts compatible with CDS.
fix_appclasspath()3481 void Arguments::fix_appclasspath() {
3482 if (IgnoreEmptyClassPaths) {
3483 const char separator = *os::path_separator();
3484 const char* src = _java_class_path->value();
3485
3486 // skip over all the leading empty paths
3487 while (*src == separator) {
3488 src ++;
3489 }
3490
3491 char* copy = os::strdup(src, mtInternal);
3492
3493 // trim all trailing empty paths
3494 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3495 *tail = '\0';
3496 }
3497
3498 char from[3] = {separator, separator, '\0'};
3499 char to [2] = {separator, '\0'};
3500 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3501 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3502 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3503 }
3504
3505 _java_class_path->set_value(copy);
3506 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3507 }
3508
3509 if (!PrintSharedArchiveAndExit) {
3510 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3511 }
3512 }
3513
has_jar_files(const char * directory)3514 static bool has_jar_files(const char* directory) {
3515 DIR* dir = os::opendir(directory);
3516 if (dir == NULL) return false;
3517
3518 struct dirent *entry;
3519 bool hasJarFile = false;
3520 while (!hasJarFile && (entry = os::readdir(dir)) != NULL) {
3521 const char* name = entry->d_name;
3522 const char* ext = name + strlen(name) - 4;
3523 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3524 }
3525 os::closedir(dir);
3526 return hasJarFile ;
3527 }
3528
3529 // returns the number of directories in the given path containing JAR files
3530 // If the skip argument is not NULL, it will skip that directory
check_non_empty_dirs(const char * path,const char * type,const char * skip)3531 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3532 const char separator = *os::path_separator();
3533 const char* const end = path + strlen(path);
3534 int nonEmptyDirs = 0;
3535 while (path < end) {
3536 const char* tmp_end = strchr(path, separator);
3537 if (tmp_end == NULL) {
3538 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3539 nonEmptyDirs++;
3540 jio_fprintf(defaultStream::output_stream(),
3541 "Non-empty %s directory: %s\n", type, path);
3542 }
3543 path = end;
3544 } else {
3545 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3546 memcpy(dirpath, path, tmp_end - path);
3547 dirpath[tmp_end - path] = '\0';
3548 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3549 nonEmptyDirs++;
3550 jio_fprintf(defaultStream::output_stream(),
3551 "Non-empty %s directory: %s\n", type, dirpath);
3552 }
3553 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3554 path = tmp_end + 1;
3555 }
3556 }
3557 return nonEmptyDirs;
3558 }
3559
3560 // Returns true if endorsed standards override mechanism and extension mechanism
3561 // are not used.
check_endorsed_and_ext_dirs()3562 static bool check_endorsed_and_ext_dirs() {
3563 if (!CheckEndorsedAndExtDirs)
3564 return true;
3565
3566 char endorsedDir[JVM_MAXPATHLEN];
3567 char extDir[JVM_MAXPATHLEN];
3568 const char* fileSep = os::file_separator();
3569 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3570 Arguments::get_java_home(), fileSep, fileSep);
3571 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3572 Arguments::get_java_home(), fileSep, fileSep);
3573
3574 // check endorsed directory
3575 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3576
3577 // check the extension directories but skip the default lib/ext directory
3578 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3579
3580 // List of JAR files installed in the default lib/ext directory.
3581 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3582 static const char* jdk_ext_jars[] = {
3583 "access-bridge-32.jar",
3584 "access-bridge-64.jar",
3585 "access-bridge.jar",
3586 "cldrdata.jar",
3587 "dnsns.jar",
3588 "jaccess.jar",
3589 "jfxrt.jar",
3590 "localedata.jar",
3591 "nashorn.jar",
3592 "sunec.jar",
3593 "sunjce_provider.jar",
3594 "sunmscapi.jar",
3595 "sunpkcs11.jar",
3596 "ucrypto.jar",
3597 "zipfs.jar",
3598 NULL
3599 };
3600
3601 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3602 DIR* dir = os::opendir(extDir);
3603 if (dir != NULL) {
3604 int num_ext_jars = 0;
3605 struct dirent *entry;
3606 while ((entry = os::readdir(dir)) != NULL) {
3607 const char* name = entry->d_name;
3608 const char* ext = name + strlen(name) - 4;
3609 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3610 bool is_jdk_jar = false;
3611 const char* jarfile = NULL;
3612 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3613 if (os::file_name_strcmp(name, jarfile) == 0) {
3614 is_jdk_jar = true;
3615 break;
3616 }
3617 }
3618 if (!is_jdk_jar) {
3619 jio_fprintf(defaultStream::output_stream(),
3620 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3621 num_ext_jars++;
3622 }
3623 }
3624 }
3625 os::closedir(dir);
3626 if (num_ext_jars > 0) {
3627 nonEmptyDirs += 1;
3628 }
3629 }
3630
3631 // check if the default lib/endorsed directory exists; if so, error
3632 dir = os::opendir(endorsedDir);
3633 if (dir != NULL) {
3634 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3635 os::closedir(dir);
3636 nonEmptyDirs += 1;
3637 }
3638
3639 if (nonEmptyDirs > 0) {
3640 jio_fprintf(defaultStream::output_stream(),
3641 "Endorsed standards override mechanism and extension mechanism "
3642 "will not be supported in a future release.\n"
3643 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3644 return false;
3645 }
3646
3647 return true;
3648 }
3649
finalize_vm_init_args(SysClassPath * scp_p,bool scp_assembly_required)3650 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3651 // This must be done after all -D arguments have been processed.
3652 scp_p->expand_endorsed();
3653
3654 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3655 // Assemble the bootclasspath elements into the final path.
3656 Arguments::set_sysclasspath(scp_p->combined_path());
3657 }
3658
3659 if (!check_endorsed_and_ext_dirs()) {
3660 return JNI_ERR;
3661 }
3662
3663 // This must be done after all arguments have been processed
3664 // and the container support has been initialized since AggressiveHeap
3665 // relies on the amount of total memory available.
3666 if (AggressiveHeap) {
3667 jint result = set_aggressive_heap_flags();
3668 if (result != JNI_OK) {
3669 return result;
3670 }
3671 }
3672 // This must be done after all arguments have been processed.
3673 // java_compiler() true means set to "NONE" or empty.
3674 if (java_compiler() && !xdebug_mode()) {
3675 // For backwards compatibility, we switch to interpreted mode if
3676 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3677 // not specified.
3678 set_mode_flags(_int);
3679 }
3680 if (CompileThreshold == 0) {
3681 set_mode_flags(_int);
3682 }
3683
3684 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3685 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3686 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3687 }
3688
3689 #ifndef COMPILER2
3690 // Don't degrade server performance for footprint
3691 if (FLAG_IS_DEFAULT(UseLargePages) &&
3692 MaxHeapSize < LargePageHeapSizeThreshold) {
3693 // No need for large granularity pages w/small heaps.
3694 // Note that large pages are enabled/disabled for both the
3695 // Java heap and the code cache.
3696 FLAG_SET_DEFAULT(UseLargePages, false);
3697 }
3698
3699 #else
3700 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3701 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3702 }
3703 #endif
3704
3705 #ifndef TIERED
3706 // Tiered compilation is undefined.
3707 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3708 #endif
3709
3710 // If we are running in a headless jre, force java.awt.headless property
3711 // to be true unless the property has already been set.
3712 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3713 if (os::is_headless_jre()) {
3714 const char* headless = Arguments::get_property("java.awt.headless");
3715 if (headless == NULL) {
3716 char envbuffer[128];
3717 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3718 if (!add_property("java.awt.headless=true")) {
3719 return JNI_ENOMEM;
3720 }
3721 } else {
3722 char buffer[256];
3723 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3724 if (!add_property(buffer)) {
3725 return JNI_ENOMEM;
3726 }
3727 }
3728 }
3729 }
3730
3731 if (!check_vm_args_consistency()) {
3732 return JNI_ERR;
3733 }
3734
3735 return JNI_OK;
3736 }
3737
parse_java_options_environment_variable(SysClassPath * scp_p,bool * scp_assembly_required_p)3738 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3739 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3740 scp_assembly_required_p);
3741 }
3742
parse_java_tool_options_environment_variable(SysClassPath * scp_p,bool * scp_assembly_required_p)3743 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3744 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3745 scp_assembly_required_p);
3746 }
3747
parse_options_environment_variable(const char * name,SysClassPath * scp_p,bool * scp_assembly_required_p)3748 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3749 const int N_MAX_OPTIONS = 64;
3750 const int OPTION_BUFFER_SIZE = 1024;
3751 char buffer[OPTION_BUFFER_SIZE];
3752
3753 // The variable will be ignored if it exceeds the length of the buffer.
3754 // Don't check this variable if user has special privileges
3755 // (e.g. unix su command).
3756 if (os::getenv(name, buffer, sizeof(buffer)) &&
3757 !os::have_special_privileges()) {
3758 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3759 jio_fprintf(defaultStream::error_stream(),
3760 "Picked up %s: %s\n", name, buffer);
3761 char* rd = buffer; // pointer to the input string (rd)
3762 int i;
3763 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3764 while (isspace(*rd)) rd++; // skip whitespace
3765 if (*rd == 0) break; // we re done when the input string is read completely
3766
3767 // The output, option string, overwrites the input string.
3768 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3769 // input string (rd).
3770 char* wrt = rd;
3771
3772 options[i++].optionString = wrt; // Fill in option
3773 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3774 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3775 int quote = *rd; // matching quote to look for
3776 rd++; // don't copy open quote
3777 while (*rd != quote) { // include everything (even spaces) up until quote
3778 if (*rd == 0) { // string termination means unmatched string
3779 jio_fprintf(defaultStream::error_stream(),
3780 "Unmatched quote in %s\n", name);
3781 return JNI_ERR;
3782 }
3783 *wrt++ = *rd++; // copy to option string
3784 }
3785 rd++; // don't copy close quote
3786 } else {
3787 *wrt++ = *rd++; // copy to option string
3788 }
3789 }
3790 // Need to check if we're done before writing a NULL,
3791 // because the write could be to the byte that rd is pointing to.
3792 if (*rd++ == 0) {
3793 *wrt = 0;
3794 break;
3795 }
3796 *wrt = 0; // Zero terminate option
3797 }
3798 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3799 JavaVMInitArgs vm_args;
3800 vm_args.version = JNI_VERSION_1_2;
3801 vm_args.options = options;
3802 vm_args.nOptions = i;
3803 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3804
3805 if (PrintVMOptions) {
3806 const char* tail;
3807 for (int i = 0; i < vm_args.nOptions; i++) {
3808 const JavaVMOption *option = vm_args.options + i;
3809 if (match_option(option, "-XX:", &tail)) {
3810 logOption(tail);
3811 }
3812 }
3813 }
3814
3815 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3816 }
3817 return JNI_OK;
3818 }
3819
set_shared_spaces_flags()3820 void Arguments::set_shared_spaces_flags() {
3821 if (DumpSharedSpaces) {
3822 if (FailOverToOldVerifier) {
3823 // Don't fall back to the old verifier on verification failure. If a
3824 // class fails verification with the split verifier, it might fail the
3825 // CDS runtime verifier constraint check. In that case, we don't want
3826 // to share the class. We only archive classes that pass the split verifier.
3827 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3828 }
3829
3830 if (RequireSharedSpaces) {
3831 warning("cannot dump shared archive while using shared archive");
3832 }
3833 UseSharedSpaces = false;
3834 #ifdef _LP64
3835 if (!UseCompressedOops || !UseCompressedClassPointers) {
3836 vm_exit_during_initialization(
3837 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3838 }
3839 } else {
3840 if (!UseCompressedOops || !UseCompressedClassPointers) {
3841 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3842 }
3843 #endif
3844 }
3845 }
3846
3847 #if !INCLUDE_ALL_GCS
force_serial_gc()3848 static void force_serial_gc() {
3849 FLAG_SET_DEFAULT(UseSerialGC, true);
3850 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3851 UNSUPPORTED_GC_OPTION(UseG1GC);
3852 UNSUPPORTED_GC_OPTION(UseParallelGC);
3853 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3854 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3855 UNSUPPORTED_GC_OPTION(UseParNewGC);
3856 }
3857 #endif // INCLUDE_ALL_GCS
3858
3859 // Sharing support
3860 // Construct the path to the archive
get_shared_archive_path()3861 static char* get_shared_archive_path() {
3862 char *shared_archive_path;
3863 if (SharedArchiveFile == NULL) {
3864 char jvm_path[JVM_MAXPATHLEN];
3865 os::jvm_path(jvm_path, sizeof(jvm_path));
3866 char *end = strrchr(jvm_path, *os::file_separator());
3867 if (end != NULL) *end = '\0';
3868 size_t jvm_path_len = strlen(jvm_path);
3869 size_t file_sep_len = strlen(os::file_separator());
3870 const size_t len = jvm_path_len + file_sep_len + 20;
3871 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3872 if (shared_archive_path != NULL) {
3873 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3874 jvm_path, os::file_separator());
3875 }
3876 } else {
3877 shared_archive_path = os::strdup(SharedArchiveFile, mtInternal);
3878 }
3879 return shared_archive_path;
3880 }
3881
3882 #ifndef PRODUCT
3883 // Determine whether LogVMOutput should be implicitly turned on.
use_vm_log()3884 static bool use_vm_log() {
3885 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3886 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3887 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3888 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3889 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3890 return true;
3891 }
3892
3893 #ifdef COMPILER1
3894 if (PrintC1Statistics) {
3895 return true;
3896 }
3897 #endif // COMPILER1
3898
3899 #ifdef COMPILER2
3900 if (PrintOptoAssembly || PrintOptoStatistics) {
3901 return true;
3902 }
3903 #endif // COMPILER2
3904
3905 return false;
3906 }
3907 #endif // PRODUCT
3908
3909 // Parse entry point called from JNI_CreateJavaVM
3910
parse(const JavaVMInitArgs * args)3911 jint Arguments::parse(const JavaVMInitArgs* args) {
3912
3913 // Remaining part of option string
3914 const char* tail;
3915
3916 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3917 const char* hotspotrc = ".hotspotrc";
3918 bool settings_file_specified = false;
3919 bool needs_hotspotrc_warning = false;
3920
3921 ArgumentsExt::process_options(args);
3922
3923 const char* flags_file;
3924 int index;
3925 for (index = 0; index < args->nOptions; index++) {
3926 const JavaVMOption *option = args->options + index;
3927 if (match_option(option, "-XX:Flags=", &tail)) {
3928 flags_file = tail;
3929 settings_file_specified = true;
3930 }
3931 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3932 PrintVMOptions = true;
3933 }
3934 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3935 PrintVMOptions = false;
3936 }
3937 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3938 IgnoreUnrecognizedVMOptions = true;
3939 }
3940 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3941 IgnoreUnrecognizedVMOptions = false;
3942 }
3943 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3944 CommandLineFlags::printFlags(tty, false);
3945 vm_exit(0);
3946 }
3947 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3948 #if INCLUDE_NMT
3949 // The launcher did not setup nmt environment variable properly.
3950 if (!MemTracker::check_launcher_nmt_support(tail)) {
3951 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3952 }
3953
3954 // Verify if nmt option is valid.
3955 if (MemTracker::verify_nmt_option()) {
3956 // Late initialization, still in single-threaded mode.
3957 if (MemTracker::tracking_level() >= NMT_summary) {
3958 MemTracker::init();
3959 }
3960 } else {
3961 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3962 }
3963 #else
3964 jio_fprintf(defaultStream::error_stream(),
3965 "Native Memory Tracking is not supported in this VM\n");
3966 return JNI_ERR;
3967 #endif
3968 }
3969
3970
3971 #ifndef PRODUCT
3972 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3973 CommandLineFlags::printFlags(tty, true);
3974 vm_exit(0);
3975 }
3976 #endif
3977 }
3978
3979 if (IgnoreUnrecognizedVMOptions) {
3980 // uncast const to modify the flag args->ignoreUnrecognized
3981 *(jboolean*)(&args->ignoreUnrecognized) = true;
3982 }
3983
3984 // Parse specified settings file
3985 if (settings_file_specified) {
3986 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3987 return JNI_EINVAL;
3988 }
3989 } else {
3990 #ifdef ASSERT
3991 // Parse default .hotspotrc settings file
3992 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3993 return JNI_EINVAL;
3994 }
3995 #else
3996 struct stat buf;
3997 if (os::stat(hotspotrc, &buf) == 0) {
3998 needs_hotspotrc_warning = true;
3999 }
4000 #endif
4001 }
4002
4003 if (PrintVMOptions) {
4004 for (index = 0; index < args->nOptions; index++) {
4005 const JavaVMOption *option = args->options + index;
4006 if (match_option(option, "-XX:", &tail)) {
4007 logOption(tail);
4008 }
4009 }
4010 }
4011
4012 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4013 jint result = parse_vm_init_args(args);
4014 if (result != JNI_OK) {
4015 return result;
4016 }
4017
4018 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4019 SharedArchivePath = get_shared_archive_path();
4020 if (SharedArchivePath == NULL) {
4021 return JNI_ENOMEM;
4022 }
4023
4024 // Set up VerifySharedSpaces
4025 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4026 VerifySharedSpaces = true;
4027 }
4028
4029 // Delay warning until here so that we've had a chance to process
4030 // the -XX:-PrintWarnings flag
4031 if (needs_hotspotrc_warning) {
4032 warning("%s file is present but has been ignored. "
4033 "Run with -XX:Flags=%s to load the file.",
4034 hotspotrc, hotspotrc);
4035 }
4036
4037 #if defined(_ALLBSD_SOURCE) && !defined(__FreeBSD__) && !defined(__DragonFly__)
4038 // UseLargePages is not yet supported on all BSD.
4039 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4040 #endif
4041
4042 #if INCLUDE_ALL_GCS
4043 #if (defined JAVASE_EMBEDDED || defined ARM)
4044 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4045 #endif
4046 #endif
4047
4048 #ifndef PRODUCT
4049 if (TraceBytecodesAt != 0) {
4050 TraceBytecodes = true;
4051 }
4052 if (CountCompiledCalls) {
4053 if (UseCounterDecay) {
4054 warning("UseCounterDecay disabled because CountCalls is set");
4055 UseCounterDecay = false;
4056 }
4057 }
4058 #endif // PRODUCT
4059
4060 // JSR 292 is not supported before 1.7
4061 if (!JDK_Version::is_gte_jdk17x_version()) {
4062 if (EnableInvokeDynamic) {
4063 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4064 warning("JSR 292 is not supported before 1.7. Disabling support.");
4065 }
4066 EnableInvokeDynamic = false;
4067 }
4068 }
4069
4070 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4071 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4072 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4073 }
4074 ScavengeRootsInCode = 1;
4075 }
4076
4077 if (PrintGCDetails) {
4078 // Turn on -verbose:gc options as well
4079 PrintGC = true;
4080 }
4081
4082 if (!JDK_Version::is_gte_jdk18x_version()) {
4083 // To avoid changing the log format for 7 updates this flag is only
4084 // true by default in JDK8 and above.
4085 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4086 FLAG_SET_DEFAULT(PrintGCCause, false);
4087 }
4088 }
4089
4090 // Set object alignment values.
4091 set_object_alignment();
4092
4093 #if !INCLUDE_ALL_GCS
4094 force_serial_gc();
4095 #endif // INCLUDE_ALL_GCS
4096 #if !INCLUDE_CDS
4097 if (DumpSharedSpaces || RequireSharedSpaces) {
4098 jio_fprintf(defaultStream::error_stream(),
4099 "Shared spaces are not supported in this VM\n");
4100 return JNI_ERR;
4101 }
4102 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4103 warning("Shared spaces are not supported in this VM");
4104 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4105 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4106 }
4107 no_shared_spaces("CDS Disabled");
4108 #endif // INCLUDE_CDS
4109
4110 return JNI_OK;
4111 }
4112
apply_ergo()4113 jint Arguments::apply_ergo() {
4114
4115 // Set flags based on ergonomics.
4116 set_ergonomics_flags();
4117
4118 set_shared_spaces_flags();
4119
4120 #if defined(SPARC)
4121 // BIS instructions require 'membar' instruction regardless of the number
4122 // of CPUs because in virtualized/container environments which might use only 1
4123 // CPU, BIS instructions may produce incorrect results.
4124
4125 if (FLAG_IS_DEFAULT(AssumeMP)) {
4126 FLAG_SET_DEFAULT(AssumeMP, true);
4127 }
4128 #endif
4129
4130 // Check the GC selections again.
4131 if (!check_gc_consistency()) {
4132 return JNI_EINVAL;
4133 }
4134
4135 if (TieredCompilation) {
4136 set_tiered_flags();
4137 } else {
4138 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4139 if (CompilationPolicyChoice >= 2) {
4140 vm_exit_during_initialization(
4141 "Incompatible compilation policy selected", NULL);
4142 }
4143 }
4144 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4145 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4146 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4147 }
4148
4149
4150 // Set heap size based on available physical memory
4151 set_heap_size();
4152
4153 ArgumentsExt::set_gc_specific_flags();
4154
4155 // Initialize Metaspace flags and alignments.
4156 Metaspace::ergo_initialize();
4157
4158 // Set bytecode rewriting flags
4159 set_bytecode_flags();
4160
4161 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4162 set_aggressive_opts_flags();
4163
4164 // Turn off biased locking for locking debug mode flags,
4165 // which are subtlely different from each other but neither works with
4166 // biased locking.
4167 if (UseHeavyMonitors
4168 #ifdef COMPILER1
4169 || !UseFastLocking
4170 #endif // COMPILER1
4171 ) {
4172 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4173 // flag set to true on command line; warn the user that they
4174 // can't enable biased locking here
4175 warning("Biased Locking is not supported with locking debug flags"
4176 "; ignoring UseBiasedLocking flag." );
4177 }
4178 UseBiasedLocking = false;
4179 }
4180
4181 #ifdef ZERO
4182 // Clear flags not supported on zero.
4183 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4184 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4185 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4186 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4187 #endif // CC_INTERP
4188
4189 #ifdef COMPILER2
4190 if (!EliminateLocks) {
4191 EliminateNestedLocks = false;
4192 }
4193 if (!Inline) {
4194 IncrementalInline = false;
4195 }
4196 #ifndef PRODUCT
4197 if (!IncrementalInline) {
4198 AlwaysIncrementalInline = false;
4199 }
4200 #endif
4201 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4202 // incremental inlining: bump MaxNodeLimit
4203 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4204 }
4205 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4206 // nothing to use the profiling, turn if off
4207 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4208 }
4209 #endif
4210
4211 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4212 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4213 DebugNonSafepoints = true;
4214 }
4215
4216 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4217 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4218 }
4219
4220 if (UseOnStackReplacement && !UseLoopCounter) {
4221 warning("On-stack-replacement requires loop counters; enabling loop counters");
4222 FLAG_SET_DEFAULT(UseLoopCounter, true);
4223 }
4224
4225 #ifndef PRODUCT
4226 if (CompileTheWorld) {
4227 // Force NmethodSweeper to sweep whole CodeCache each time.
4228 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4229 NmethodSweepFraction = 1;
4230 }
4231 }
4232
4233 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4234 if (use_vm_log()) {
4235 LogVMOutput = true;
4236 }
4237 }
4238 #endif // PRODUCT
4239
4240 if (PrintCommandLineFlags) {
4241 CommandLineFlags::printSetFlags(tty);
4242 }
4243
4244 // Apply CPU specific policy for the BiasedLocking
4245 if (UseBiasedLocking) {
4246 if (!VM_Version::use_biased_locking() &&
4247 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4248 UseBiasedLocking = false;
4249 }
4250 }
4251 #ifdef COMPILER2
4252 if (!UseBiasedLocking || EmitSync != 0) {
4253 UseOptoBiasInlining = false;
4254 }
4255 #endif
4256
4257 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4258 // but only if not already set on the commandline
4259 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4260 bool set = false;
4261 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4262 if (!set) {
4263 FLAG_SET_DEFAULT(PauseAtExit, true);
4264 }
4265 }
4266
4267 return JNI_OK;
4268 }
4269
adjust_after_os()4270 jint Arguments::adjust_after_os() {
4271 if (UseNUMA) {
4272 if (UseParallelGC || UseParallelOldGC) {
4273 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4274 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4275 }
4276 }
4277 // UseNUMAInterleaving is set to ON for all collectors and
4278 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4279 // such as the parallel collector for Linux and Solaris will
4280 // interleave old gen and survivor spaces on top of NUMA
4281 // allocation policy for the eden space.
4282 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4283 // all platforms and ParallelGC on Windows will interleave all
4284 // of the heap spaces across NUMA nodes.
4285 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4286 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4287 }
4288 }
4289 return JNI_OK;
4290 }
4291
PropertyList_count(SystemProperty * pl)4292 int Arguments::PropertyList_count(SystemProperty* pl) {
4293 int count = 0;
4294 while(pl != NULL) {
4295 count++;
4296 pl = pl->next();
4297 }
4298 return count;
4299 }
4300
PropertyList_get_value(SystemProperty * pl,const char * key)4301 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4302 assert(key != NULL, "just checking");
4303 SystemProperty* prop;
4304 for (prop = pl; prop != NULL; prop = prop->next()) {
4305 if (strcmp(key, prop->key()) == 0) return prop->value();
4306 }
4307 return NULL;
4308 }
4309
PropertyList_get_key_at(SystemProperty * pl,int index)4310 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4311 int count = 0;
4312 const char* ret_val = NULL;
4313
4314 while(pl != NULL) {
4315 if(count >= index) {
4316 ret_val = pl->key();
4317 break;
4318 }
4319 count++;
4320 pl = pl->next();
4321 }
4322
4323 return ret_val;
4324 }
4325
PropertyList_get_value_at(SystemProperty * pl,int index)4326 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4327 int count = 0;
4328 char* ret_val = NULL;
4329
4330 while(pl != NULL) {
4331 if(count >= index) {
4332 ret_val = pl->value();
4333 break;
4334 }
4335 count++;
4336 pl = pl->next();
4337 }
4338
4339 return ret_val;
4340 }
4341
PropertyList_add(SystemProperty ** plist,SystemProperty * new_p)4342 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4343 SystemProperty* p = *plist;
4344 if (p == NULL) {
4345 *plist = new_p;
4346 } else {
4347 while (p->next() != NULL) {
4348 p = p->next();
4349 }
4350 p->set_next(new_p);
4351 }
4352 }
4353
PropertyList_add(SystemProperty ** plist,const char * k,char * v)4354 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4355 if (plist == NULL)
4356 return;
4357
4358 SystemProperty* new_p = new SystemProperty(k, v, true);
4359 PropertyList_add(plist, new_p);
4360 }
4361
4362 // This add maintains unique property key in the list.
PropertyList_unique_add(SystemProperty ** plist,const char * k,char * v,jboolean append)4363 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4364 if (plist == NULL)
4365 return;
4366
4367 // If property key exist then update with new value.
4368 SystemProperty* prop;
4369 for (prop = *plist; prop != NULL; prop = prop->next()) {
4370 if (strcmp(k, prop->key()) == 0) {
4371 if (append) {
4372 prop->append_value(v);
4373 } else {
4374 prop->set_value(v);
4375 }
4376 return;
4377 }
4378 }
4379
4380 PropertyList_add(plist, k, v);
4381 }
4382
4383 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4384 // Returns true if all of the source pointed by src has been copied over to
4385 // the destination buffer pointed by buf. Otherwise, returns false.
4386 // Notes:
4387 // 1. If the length (buflen) of the destination buffer excluding the
4388 // NULL terminator character is not long enough for holding the expanded
4389 // pid characters, it also returns false instead of returning the partially
4390 // expanded one.
4391 // 2. The passed in "buflen" should be large enough to hold the null terminator.
copy_expand_pid(const char * src,size_t srclen,char * buf,size_t buflen)4392 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4393 char* buf, size_t buflen) {
4394 const char* p = src;
4395 char* b = buf;
4396 const char* src_end = &src[srclen];
4397 char* buf_end = &buf[buflen - 1];
4398
4399 while (p < src_end && b < buf_end) {
4400 if (*p == '%') {
4401 switch (*(++p)) {
4402 case '%': // "%%" ==> "%"
4403 *b++ = *p++;
4404 break;
4405 case 'p': { // "%p" ==> current process id
4406 // buf_end points to the character before the last character so
4407 // that we could write '\0' to the end of the buffer.
4408 size_t buf_sz = buf_end - b + 1;
4409 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4410
4411 // if jio_snprintf fails or the buffer is not long enough to hold
4412 // the expanded pid, returns false.
4413 if (ret < 0 || ret >= (int)buf_sz) {
4414 return false;
4415 } else {
4416 b += ret;
4417 assert(*b == '\0', "fail in copy_expand_pid");
4418 if (p == src_end && b == buf_end + 1) {
4419 // reach the end of the buffer.
4420 return true;
4421 }
4422 }
4423 p++;
4424 break;
4425 }
4426 default :
4427 *b++ = '%';
4428 }
4429 } else {
4430 *b++ = *p++;
4431 }
4432 }
4433 *b = '\0';
4434 return (p == src_end); // return false if not all of the source was copied
4435 }
4436