1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 #define UNSUPPORTED_GC_OPTION(gc) \
61 do { \
62 if (gc) { \
63 if (FLAG_IS_CMDLINE(gc)) { \
64 warning(#gc " is not supported in this VM. Using Serial GC."); \
65 } \
66 FLAG_SET_DEFAULT(gc, false); \
67 } \
68 } while(0)
69
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 uintx Arguments::_min_heap_size = 0;
80 uintx Arguments::_min_heap_free_ratio = 0;
81 uintx Arguments::_max_heap_free_ratio = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95
96 char* Arguments::SharedArchivePath = NULL;
97
98 AgentLibraryList Arguments::_libraryList;
99 AgentLibraryList Arguments::_agentList;
100
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_sun_boot_class_path = NULL;
111
112 char* Arguments::_ext_dirs = NULL;
113
114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
115 // part of the option string.
116 static bool match_option(const JavaVMOption *option, const char* name,
117 const char** tail) {
118 int len = (int)strlen(name);
119 if (strncmp(option->optionString, name, len) == 0) {
120 *tail = option->optionString + len;
121 return true;
122 } else {
123 return false;
124 }
125 }
126
127 // Check if 'option' matches 'name'. No "tail" is allowed.
128 static bool match_option(const JavaVMOption *option, const char* name) {
129 const char* tail = NULL;
130 bool result = match_option(option, name, &tail);
131 if (tail != NULL && *tail == '\0') {
132 return result;
133 } else {
134 return false;
135 }
136 }
137
138 // Return true if any of the strings in null-terminated array 'names' matches.
139 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
140 // the option must match exactly.
141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
142 bool tail_allowed) {
143 for (/* empty */; *names != NULL; ++names) {
144 if (match_option(option, *names, tail)) {
145 if (**tail == '\0' || tail_allowed && **tail == ':') {
146 return true;
147 }
148 }
149 }
150 return false;
151 }
152
153 static void logOption(const char* opt) {
154 if (PrintVMOptions) {
155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
156 }
157 }
158
159 // Process java launcher properties.
160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
162 // sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
168
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
174 if (strcmp(tail, "true") == 0) {
175 _sun_java_launcher_is_altjvm = true;
176 }
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
180 _sun_java_launcher_pid = atoi(tail);
181 continue;
182 }
183 }
184 }
185
186 // Initialize system properties key and value.
187 void Arguments::init_system_properties() {
188
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
190 "Java Virtual Machine Specification", false));
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
194
195 // Following are JVMTI agent writable properties.
196 // Properties values are set to NULL and they are
197 // os specific they are initialized in os::init_system_properties_values().
198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
199 _java_library_path = new SystemProperty("java.library.path", NULL, true);
200 _java_home = new SystemProperty("java.home", NULL, true);
201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
202
203 _java_class_path = new SystemProperty("java.class.path", "", true);
204
205 // Add to System Property list.
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 spec_vendor = "Oracle Corporation";
225 spec_version = JDK_Version::current().major_version();
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
227
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
235
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 */
244 typedef struct {
245 const char* name;
246 JDK_Version obsoleted_in; // when the flag went away
247 JDK_Version accept_until; // which version to start denying the existence
248 } ObsoleteFlag;
249
250 static ObsoleteFlag obsolete_jvm_flags[] = {
251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
266 { "DefaultInitialRAMFraction",
267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "UseDepthFirstScavengeOrder",
269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
270 { "HandlePromotionFailure",
271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
272 { "MaxLiveObjectEvacuationRatio",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
275 { "UseParallelOldGCCompacting",
276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
277 { "UseParallelDensePrefixUpdate",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelOldGCDensePrefix",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 #ifdef PRODUCT
304 { "DesiredMethodLimit",
305 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
306 #endif // PRODUCT
307 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
310 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
315 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
316 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
317 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
318 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
319 #ifndef ZERO
320 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
321 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
322 #endif // ZERO
323 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
324 { NULL, JDK_Version(0), JDK_Version(0) }
325 };
326
327 // Returns true if the flag is obsolete and fits into the range specified
328 // for being ignored. In the case that the flag is ignored, the 'version'
329 // value is filled in with the version number when the flag became
330 // obsolete so that that value can be displayed to the user.
331 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
332 int i = 0;
333 assert(version != NULL, "Must provide a version buffer");
334 while (obsolete_jvm_flags[i].name != NULL) {
335 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
336 // <flag>=xxx form
337 // [-|+]<flag> form
338 size_t len = strlen(flag_status.name);
339 if (((strncmp(flag_status.name, s, len) == 0) &&
340 (strlen(s) == len)) ||
341 ((s[0] == '+' || s[0] == '-') &&
342 (strncmp(flag_status.name, &s[1], len) == 0) &&
343 (strlen(&s[1]) == len))) {
344 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
345 *version = flag_status.obsoleted_in;
346 return true;
347 }
348 }
349 i++;
350 }
351 return false;
352 }
353
354 // Constructs the system class path (aka boot class path) from the following
355 // components, in order:
356 //
357 // prefix // from -Xbootclasspath/p:...
358 // base // from os::get_system_properties() or -Xbootclasspath=
359 // suffix // from -Xbootclasspath/a:...
360 //
361 // This could be AllStatic, but it isn't needed after argument processing is
362 // complete.
363 class SysClassPath: public StackObj {
364 public:
365 SysClassPath(const char* base);
366 ~SysClassPath();
367
368 inline void set_base(const char* base);
369 inline void add_prefix(const char* prefix);
370 inline void add_suffix_to_prefix(const char* suffix);
371 inline void add_suffix(const char* suffix);
372 inline void reset_path(const char* base);
373
374 inline const char* get_base() const { return _items[_scp_base]; }
375 inline const char* get_prefix() const { return _items[_scp_prefix]; }
376 inline const char* get_suffix() const { return _items[_scp_suffix]; }
377
378 // Combine all the components into a single c-heap-allocated string; caller
379 // must free the string if/when no longer needed.
380 char* combined_path();
381
382 private:
383 // Utility routines.
384 static char* add_to_path(const char* path, const char* str, bool prepend);
385 static char* add_jars_to_path(char* path, const char* directory);
386
387 inline void reset_item_at(int index);
388
389 // Array indices for the items that make up the sysclasspath. All except the
390 // base are allocated in the C heap and freed by this class.
391 enum {
392 _scp_prefix, // from -Xbootclasspath/p:...
393 _scp_base, // the default sysclasspath
394 _scp_suffix, // from -Xbootclasspath/a:...
395 _scp_nitems // the number of items, must be last.
396 };
397
398 const char* _items[_scp_nitems];
399 };
400
401 SysClassPath::SysClassPath(const char* base) {
402 memset(_items, 0, sizeof(_items));
403 _items[_scp_base] = base;
404 }
405
406 SysClassPath::~SysClassPath() {
407 // Free everything except the base.
408 for (int i = 0; i < _scp_nitems; ++i) {
409 if (i != _scp_base) reset_item_at(i);
410 }
411 }
412
413 inline void SysClassPath::set_base(const char* base) {
414 _items[_scp_base] = base;
415 }
416
417 inline void SysClassPath::add_prefix(const char* prefix) {
418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
419 }
420
421 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
422 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
423 }
424
425 inline void SysClassPath::add_suffix(const char* suffix) {
426 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
427 }
428
429 inline void SysClassPath::reset_item_at(int index) {
430 assert(index < _scp_nitems && index != _scp_base, "just checking");
431 if (_items[index] != NULL) {
432 FREE_C_HEAP_ARRAY(char, _items[index]);
433 _items[index] = NULL;
434 }
435 }
436
437 inline void SysClassPath::reset_path(const char* base) {
438 // Clear the prefix and suffix.
439 reset_item_at(_scp_prefix);
440 reset_item_at(_scp_suffix);
441 set_base(base);
442 }
443
444 //------------------------------------------------------------------------------
445
446
447 // Combine the bootclasspath elements, some of which may be null, into a single
448 // c-heap-allocated string.
449 char* SysClassPath::combined_path() {
450 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
451
452 size_t lengths[_scp_nitems];
453 size_t total_len = 0;
454
455 const char separator = *os::path_separator();
456
457 // Get the lengths.
458 int i;
459 for (i = 0; i < _scp_nitems; ++i) {
460 if (_items[i] != NULL) {
461 lengths[i] = strlen(_items[i]);
462 // Include space for the separator char (or a NULL for the last item).
463 total_len += lengths[i] + 1;
464 }
465 }
466 assert(total_len > 0, "empty sysclasspath not allowed");
467
468 // Copy the _items to a single string.
469 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
470 char* cp_tmp = cp;
471 for (i = 0; i < _scp_nitems; ++i) {
472 if (_items[i] != NULL) {
473 memcpy(cp_tmp, _items[i], lengths[i]);
474 cp_tmp += lengths[i];
475 *cp_tmp++ = separator;
476 }
477 }
478 *--cp_tmp = '\0'; // Replace the extra separator.
479 return cp;
480 }
481
482 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
483 char*
484 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
485 char *cp;
486
487 assert(str != NULL, "just checking");
488 if (path == NULL) {
489 size_t len = strlen(str) + 1;
490 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
491 memcpy(cp, str, len); // copy the trailing null
492 } else {
493 const char separator = *os::path_separator();
494 size_t old_len = strlen(path);
495 size_t str_len = strlen(str);
496 size_t len = old_len + str_len + 2;
497
498 if (prepend) {
499 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
500 char* cp_tmp = cp;
501 memcpy(cp_tmp, str, str_len);
502 cp_tmp += str_len;
503 *cp_tmp = separator;
504 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
505 FREE_C_HEAP_ARRAY(char, path);
506 } else {
507 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
508 char* cp_tmp = cp + old_len;
509 *cp_tmp = separator;
510 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
511 }
512 }
513 return cp;
514 }
515
516 // Scan the directory and append any jar or zip files found to path.
517 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
518 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
519 DIR* dir = os::opendir(directory);
520 if (dir == NULL) return path;
521
522 char dir_sep[2] = { '\0', '\0' };
523 size_t directory_len = strlen(directory);
524 const char fileSep = *os::file_separator();
525 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
526
527 /* Scan the directory for jars/zips, appending them to path. */
528 struct dirent *entry;
529 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
530 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
531 const char* name = entry->d_name;
532 const char* ext = name + strlen(name) - 4;
533 bool isJarOrZip = ext > name &&
534 (os::file_name_strcmp(ext, ".jar") == 0 ||
535 os::file_name_strcmp(ext, ".zip") == 0);
536 if (isJarOrZip) {
537 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
538 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
539 path = add_to_path(path, jarpath, false);
540 FREE_C_HEAP_ARRAY(char, jarpath);
541 }
542 }
543 FREE_C_HEAP_ARRAY(char, dbuf);
544 os::closedir(dir);
545 return path;
546 }
547
548 // Parses a memory size specification string.
549 static bool atomull(const char *s, julong* result) {
550 julong n = 0;
551 int args_read = 0;
552 bool is_hex = false;
553 // Skip leading 0[xX] for hexadecimal
554 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
555 s += 2;
556 is_hex = true;
557 args_read = sscanf(s, JULONG_FORMAT_X, &n);
558 } else {
559 args_read = sscanf(s, JULONG_FORMAT, &n);
560 }
561 if (args_read != 1) {
562 return false;
563 }
564 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
565 s++;
566 }
567 // 4705540: illegal if more characters are found after the first non-digit
568 if (strlen(s) > 1) {
569 return false;
570 }
571 switch (*s) {
572 case 'T': case 't':
573 *result = n * G * K;
574 // Check for overflow.
575 if (*result/((julong)G * K) != n) return false;
576 return true;
577 case 'G': case 'g':
578 *result = n * G;
579 if (*result/G != n) return false;
580 return true;
581 case 'M': case 'm':
582 *result = n * M;
583 if (*result/M != n) return false;
584 return true;
585 case 'K': case 'k':
586 *result = n * K;
587 if (*result/K != n) return false;
588 return true;
589 case '\0':
590 *result = n;
591 return true;
592 default:
593 return false;
594 }
595 }
596
597 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
598 if (size < min_size) return arg_too_small;
599 // Check that size will fit in a size_t (only relevant on 32-bit)
600 if (size > max_uintx) return arg_too_big;
601 return arg_in_range;
602 }
603
604 // Describe an argument out of range error
605 void Arguments::describe_range_error(ArgsRange errcode) {
606 switch(errcode) {
607 case arg_too_big:
608 jio_fprintf(defaultStream::error_stream(),
609 "The specified size exceeds the maximum "
610 "representable size.\n");
611 break;
612 case arg_too_small:
613 case arg_unreadable:
614 case arg_in_range:
615 // do nothing for now
616 break;
617 default:
618 ShouldNotReachHere();
619 }
620 }
621
622 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
623 return CommandLineFlags::boolAtPut(name, &value, origin);
624 }
625
626 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
627 double v;
628 if (sscanf(value, "%lf", &v) != 1) {
629 return false;
630 }
631
632 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
633 return true;
634 }
635 return false;
636 }
637
638 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
639 julong v;
640 intx intx_v;
641 bool is_neg = false;
642 // Check the sign first since atomull() parses only unsigned values.
643 if (*value == '-') {
644 if (!CommandLineFlags::intxAt(name, &intx_v)) {
645 return false;
646 }
647 value++;
648 is_neg = true;
649 }
650 if (!atomull(value, &v)) {
651 return false;
652 }
653 intx_v = (intx) v;
654 if (is_neg) {
655 intx_v = -intx_v;
656 }
657 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
658 return true;
659 }
660 uintx uintx_v = (uintx) v;
661 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
662 return true;
663 }
664 uint64_t uint64_t_v = (uint64_t) v;
665 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
666 return true;
667 }
668 size_t size_t_v = (size_t) v;
669 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
670 return true;
671 }
672 return false;
673 }
674
675 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
676 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
677 // Contract: CommandLineFlags always returns a pointer that needs freeing.
678 FREE_C_HEAP_ARRAY(char, value);
679 return true;
680 }
681
682 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
683 const char* old_value = "";
684 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
685 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
686 size_t new_len = strlen(new_value);
687 const char* value;
688 char* free_this_too = NULL;
689 if (old_len == 0) {
690 value = new_value;
691 } else if (new_len == 0) {
692 value = old_value;
693 } else {
694 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
695 // each new setting adds another LINE to the switch:
696 sprintf(buf, "%s\n%s", old_value, new_value);
697 value = buf;
698 free_this_too = buf;
699 }
700 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
701 // CommandLineFlags always returns a pointer that needs freeing.
702 FREE_C_HEAP_ARRAY(char, value);
703 if (free_this_too != NULL) {
704 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
705 FREE_C_HEAP_ARRAY(char, free_this_too);
706 }
707 return true;
708 }
709
710 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
711
712 // range of acceptable characters spelled out for portability reasons
713 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
714 #define BUFLEN 255
715 char name[BUFLEN+1];
716 char dummy;
717
718 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
719 return set_bool_flag(name, false, origin);
720 }
721 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
722 return set_bool_flag(name, true, origin);
723 }
724
725 char punct;
726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
727 const char* value = strchr(arg, '=') + 1;
728 Flag* flag = Flag::find_flag(name, strlen(name));
729 if (flag != NULL && flag->is_ccstr()) {
730 if (flag->ccstr_accumulates()) {
731 return append_to_string_flag(name, value, origin);
732 } else {
733 if (value[0] == '\0') {
734 value = NULL;
735 }
736 return set_string_flag(name, value, origin);
737 }
738 }
739 }
740
741 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
742 const char* value = strchr(arg, '=') + 1;
743 // -XX:Foo:=xxx will reset the string flag to the given value.
744 if (value[0] == '\0') {
745 value = NULL;
746 }
747 return set_string_flag(name, value, origin);
748 }
749
750 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
751 #define SIGNED_NUMBER_RANGE "[-0123456789]"
752 #define NUMBER_RANGE "[0123456789]"
753 char value[BUFLEN + 1];
754 char value2[BUFLEN + 1];
755 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
756 // Looks like a floating-point number -- try again with more lenient format string
757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
758 return set_fp_numeric_flag(name, value, origin);
759 }
760 }
761
762 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
763 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
764 return set_numeric_flag(name, value, origin);
765 }
766
767 return false;
768 }
769
770 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
771 assert(bldarray != NULL, "illegal argument");
772
773 if (arg == NULL) {
774 return;
775 }
776
777 int new_count = *count + 1;
778
779 // expand the array and add arg to the last element
780 if (*bldarray == NULL) {
781 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
782 } else {
783 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
784 }
785 (*bldarray)[*count] = os::strdup_check_oom(arg);
786 *count = new_count;
787 }
788
789 void Arguments::build_jvm_args(const char* arg) {
790 add_string(&_jvm_args_array, &_num_jvm_args, arg);
791 }
792
793 void Arguments::build_jvm_flags(const char* arg) {
794 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
795 }
796
797 // utility function to return a string that concatenates all
798 // strings in a given char** array
799 const char* Arguments::build_resource_string(char** args, int count) {
800 if (args == NULL || count == 0) {
801 return NULL;
802 }
803 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
804 for (int i = 1; i < count; i++) {
805 length += strlen(args[i]) + 1; // add 1 for a space
806 }
807 char* s = NEW_RESOURCE_ARRAY(char, length);
808 strcpy(s, args[0]);
809 for (int j = 1; j < count; j++) {
810 strcat(s, " ");
811 strcat(s, args[j]);
812 }
813 return (const char*) s;
814 }
815
816 void Arguments::print_on(outputStream* st) {
817 st->print_cr("VM Arguments:");
818 if (num_jvm_flags() > 0) {
819 st->print("jvm_flags: "); print_jvm_flags_on(st);
820 }
821 if (num_jvm_args() > 0) {
822 st->print("jvm_args: "); print_jvm_args_on(st);
823 }
824 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
825 if (_java_class_path != NULL) {
826 char* path = _java_class_path->value();
827 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
828 }
829 st->print_cr("Launcher Type: %s", _sun_java_launcher);
830 }
831
832 void Arguments::print_jvm_flags_on(outputStream* st) {
833 if (_num_jvm_flags > 0) {
834 for (int i=0; i < _num_jvm_flags; i++) {
835 st->print("%s ", _jvm_flags_array[i]);
836 }
837 st->cr();
838 }
839 }
840
841 void Arguments::print_jvm_args_on(outputStream* st) {
842 if (_num_jvm_args > 0) {
843 for (int i=0; i < _num_jvm_args; i++) {
844 st->print("%s ", _jvm_args_array[i]);
845 }
846 st->cr();
847 }
848 }
849
850 bool Arguments::process_argument(const char* arg,
851 jboolean ignore_unrecognized, Flag::Flags origin) {
852
853 JDK_Version since = JDK_Version();
854
855 if (parse_argument(arg, origin) || ignore_unrecognized) {
856 return true;
857 }
858
859 bool has_plus_minus = (*arg == '+' || *arg == '-');
860 const char* const argname = has_plus_minus ? arg + 1 : arg;
861 if (is_newly_obsolete(arg, &since)) {
862 char version[256];
863 since.to_string(version, sizeof(version));
864 warning("ignoring option %s; support was removed in %s", argname, version);
865 return true;
866 }
867
868 // For locked flags, report a custom error message if available.
869 // Otherwise, report the standard unrecognized VM option.
870
871 size_t arg_len;
872 const char* equal_sign = strchr(argname, '=');
873 if (equal_sign == NULL) {
874 arg_len = strlen(argname);
875 } else {
876 arg_len = equal_sign - argname;
877 }
878
879 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
880 if (found_flag != NULL) {
881 char locked_message_buf[BUFLEN];
882 found_flag->get_locked_message(locked_message_buf, BUFLEN);
883 if (strlen(locked_message_buf) == 0) {
884 if (found_flag->is_bool() && !has_plus_minus) {
885 jio_fprintf(defaultStream::error_stream(),
886 "Missing +/- setting for VM option '%s'\n", argname);
887 } else if (!found_flag->is_bool() && has_plus_minus) {
888 jio_fprintf(defaultStream::error_stream(),
889 "Unexpected +/- setting in VM option '%s'\n", argname);
890 } else {
891 jio_fprintf(defaultStream::error_stream(),
892 "Improperly specified VM option '%s'\n", argname);
893 }
894 } else {
895 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
896 }
897 } else {
898 jio_fprintf(defaultStream::error_stream(),
899 "Unrecognized VM option '%s'\n", argname);
900 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
901 if (fuzzy_matched != NULL) {
902 jio_fprintf(defaultStream::error_stream(),
903 "Did you mean '%s%s%s'? ",
904 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
905 fuzzy_matched->_name,
906 (fuzzy_matched->is_bool()) ? "" : "=<value>");
907 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
908 char version[256];
909 since.to_string(version, sizeof(version));
910 jio_fprintf(defaultStream::error_stream(),
911 "Warning: support for %s was removed in %s\n",
912 fuzzy_matched->_name,
913 version);
914 }
915 }
916 }
917
918 // allow for commandline "commenting out" options like -XX:#+Verbose
919 return arg[0] == '#';
920 }
921
922 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
923 FILE* stream = fopen(file_name, "rb");
924 if (stream == NULL) {
925 if (should_exist) {
926 jio_fprintf(defaultStream::error_stream(),
927 "Could not open settings file %s\n", file_name);
928 return false;
929 } else {
930 return true;
931 }
932 }
933
934 char token[1024];
935 int pos = 0;
936
937 bool in_white_space = true;
938 bool in_comment = false;
939 bool in_quote = false;
940 char quote_c = 0;
941 bool result = true;
942
943 int c = getc(stream);
944 while(c != EOF && pos < (int)(sizeof(token)-1)) {
945 if (in_white_space) {
946 if (in_comment) {
947 if (c == '\n') in_comment = false;
948 } else {
949 if (c == '#') in_comment = true;
950 else if (!isspace(c)) {
951 in_white_space = false;
952 token[pos++] = c;
953 }
954 }
955 } else {
956 if (c == '\n' || (!in_quote && isspace(c))) {
957 // token ends at newline, or at unquoted whitespace
958 // this allows a way to include spaces in string-valued options
959 token[pos] = '\0';
960 logOption(token);
961 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
962 build_jvm_flags(token);
963 pos = 0;
964 in_white_space = true;
965 in_quote = false;
966 } else if (!in_quote && (c == '\'' || c == '"')) {
967 in_quote = true;
968 quote_c = c;
969 } else if (in_quote && (c == quote_c)) {
970 in_quote = false;
971 } else {
972 token[pos++] = c;
973 }
974 }
975 c = getc(stream);
976 }
977 if (pos > 0) {
978 token[pos] = '\0';
979 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
980 build_jvm_flags(token);
981 }
982 fclose(stream);
983 return result;
984 }
985
986 //=============================================================================================================
987 // Parsing of properties (-D)
988
989 const char* Arguments::get_property(const char* key) {
990 return PropertyList_get_value(system_properties(), key);
991 }
992
993 bool Arguments::add_property(const char* prop) {
994 const char* eq = strchr(prop, '=');
995 char* key;
996 // ns must be static--its address may be stored in a SystemProperty object.
997 const static char ns[1] = {0};
998 char* value = (char *)ns;
999
1000 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1001 key = AllocateHeap(key_len + 1, mtInternal);
1002 strncpy(key, prop, key_len);
1003 key[key_len] = '\0';
1004
1005 if (eq != NULL) {
1006 size_t value_len = strlen(prop) - key_len - 1;
1007 value = AllocateHeap(value_len + 1, mtInternal);
1008 strncpy(value, &prop[key_len + 1], value_len + 1);
1009 }
1010
1011 if (strcmp(key, "java.compiler") == 0) {
1012 process_java_compiler_argument(value);
1013 FreeHeap(key);
1014 if (eq != NULL) {
1015 FreeHeap(value);
1016 }
1017 return true;
1018 } else if (strcmp(key, "sun.java.command") == 0) {
1019 _java_command = value;
1020
1021 // Record value in Arguments, but let it get passed to Java.
1022 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1023 strcmp(key, "sun.java.launcher.pid") == 0) {
1024 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1025 // private and are processed in process_sun_java_launcher_properties();
1026 // the sun.java.launcher property is passed on to the java application
1027 FreeHeap(key);
1028 if (eq != NULL) {
1029 FreeHeap(value);
1030 }
1031 return true;
1032 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1033 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1034 // its value without going through the property list or making a Java call.
1035 _java_vendor_url_bug = value;
1036 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1037 PropertyList_unique_add(&_system_properties, key, value, true);
1038 return true;
1039 }
1040 // Create new property and add at the end of the list
1041 PropertyList_unique_add(&_system_properties, key, value);
1042 return true;
1043 }
1044
1045 //===========================================================================================================
1046 // Setting int/mixed/comp mode flags
1047
1048 void Arguments::set_mode_flags(Mode mode) {
1049 // Set up default values for all flags.
1050 // If you add a flag to any of the branches below,
1051 // add a default value for it here.
1052 set_java_compiler(false);
1053 _mode = mode;
1054
1055 // Ensure Agent_OnLoad has the correct initial values.
1056 // This may not be the final mode; mode may change later in onload phase.
1057 PropertyList_unique_add(&_system_properties, "java.vm.info",
1058 (char*)VM_Version::vm_info_string(), false);
1059
1060 UseInterpreter = true;
1061 UseCompiler = true;
1062 UseLoopCounter = true;
1063
1064 // Default values may be platform/compiler dependent -
1065 // use the saved values
1066 ClipInlining = Arguments::_ClipInlining;
1067 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1068 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1069 BackgroundCompilation = Arguments::_BackgroundCompilation;
1070
1071 // Change from defaults based on mode
1072 switch (mode) {
1073 default:
1074 ShouldNotReachHere();
1075 break;
1076 case _int:
1077 UseCompiler = false;
1078 UseLoopCounter = false;
1079 AlwaysCompileLoopMethods = false;
1080 UseOnStackReplacement = false;
1081 break;
1082 case _mixed:
1083 // same as default
1084 break;
1085 case _comp:
1086 UseInterpreter = false;
1087 BackgroundCompilation = false;
1088 ClipInlining = false;
1089 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1090 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1091 // compile a level 4 (C2) and then continue executing it.
1092 if (TieredCompilation) {
1093 Tier3InvokeNotifyFreqLog = 0;
1094 Tier4InvocationThreshold = 0;
1095 }
1096 break;
1097 }
1098 }
1099
1100 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1101 // Conflict: required to use shared spaces (-Xshare:on), but
1102 // incompatible command line options were chosen.
1103
1104 static void no_shared_spaces(const char* message) {
1105 if (RequireSharedSpaces) {
1106 jio_fprintf(defaultStream::error_stream(),
1107 "Class data sharing is inconsistent with other specified options.\n");
1108 vm_exit_during_initialization("Unable to use shared archive.", message);
1109 } else {
1110 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1111 }
1112 }
1113 #endif
1114
1115 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1116 if (scale == 1.0 || scale <= 0.0) {
1117 return threshold;
1118 } else {
1119 return (intx)(threshold * scale);
1120 }
1121 }
1122
1123 // Returns freq_log scaled with CompileThresholdScaling
1124 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1125 // Check if scaling is necessary or negative value was specified.
1126 if (scale == 1.0 || scale < 0.0) {
1127 return freq_log;
1128 }
1129
1130 // Check value to avoid calculating log2 of 0.
1131 if (scale == 0.0) {
1132 return freq_log;
1133 }
1134
1135 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1136 // Determine the maximum notification frequency value currently supported.
1137 // The largest mask value that the interpreter/C1 can handle is
1138 // of length InvocationCounter::number_of_count_bits. Mask values are always
1139 // one bit shorter then the value of the notification frequency. Set
1140 // max_freq_bits accordingly.
1141 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1142 if (scaled_freq > nth_bit(max_freq_bits)) {
1143 return max_freq_bits;
1144 } else {
1145 return log2_intptr(scaled_freq);
1146 }
1147 }
1148
1149 void Arguments::set_tiered_flags() {
1150 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1151 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1152 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1153 }
1154 if (CompilationPolicyChoice < 2) {
1155 vm_exit_during_initialization(
1156 "Incompatible compilation policy selected", NULL);
1157 }
1158 // Increase the code cache size - tiered compiles a lot more.
1159 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1160 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1161 }
1162 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1163 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1164 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1165
1166 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1167 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1168 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1169 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1170 }
1171 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1172 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1173 }
1174 // Check consistency of code heap sizes
1175 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1178 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1179 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1180 vm_exit(1);
1181 }
1182 }
1183 }
1184 if (!UseInterpreter) { // -Xcomp
1185 Tier3InvokeNotifyFreqLog = 0;
1186 Tier4InvocationThreshold = 0;
1187 }
1188
1189 if (CompileThresholdScaling < 0) {
1190 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1191 }
1192
1193 // Scale tiered compilation thresholds
1194 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1195 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1196 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1197
1198 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1199 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1200 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1201 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1202
1203 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1204 // once these thresholds become supported.
1205
1206 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1207 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1208
1209 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1210 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1211
1212 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1213
1214 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1215 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1216 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1217 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1218 }
1219 }
1220
1221 /**
1222 * Returns the minimum number of compiler threads needed to run the JVM. The following
1223 * configurations are possible.
1224 *
1225 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1226 * compiler threads is 0.
1227 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1228 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1229 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1230 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1231 * C1 can be used, so the minimum number of compiler threads is 1.
1232 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1233 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1234 * the minimum number of compiler threads is 2.
1235 */
1236 int Arguments::get_min_number_of_compiler_threads() {
1237 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1238 return 0; // case 1
1239 #else
1240 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1241 return 1; // case 2 or case 3
1242 }
1243 return 2; // case 4 (tiered)
1244 #endif
1245 }
1246
1247 #if INCLUDE_ALL_GCS
1248 static void disable_adaptive_size_policy(const char* collector_name) {
1249 if (UseAdaptiveSizePolicy) {
1250 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1251 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1252 collector_name);
1253 }
1254 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1255 }
1256 }
1257
1258 void Arguments::set_parnew_gc_flags() {
1259 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1260 "control point invariant");
1261 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1262 assert(UseParNewGC, "ParNew should always be used with CMS");
1263
1264 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1265 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1266 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1267 } else if (ParallelGCThreads == 0) {
1268 jio_fprintf(defaultStream::error_stream(),
1269 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1270 vm_exit(1);
1271 }
1272
1273 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1274 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1275 // we set them to 1024 and 1024.
1276 // See CR 6362902.
1277 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1278 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1279 }
1280 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1281 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1282 }
1283
1284 // When using compressed oops, we use local overflow stacks,
1285 // rather than using a global overflow list chained through
1286 // the klass word of the object's pre-image.
1287 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1288 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1289 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1290 }
1291 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1292 }
1293 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1294 }
1295
1296 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1297 // sparc/solaris for certain applications, but would gain from
1298 // further optimization and tuning efforts, and would almost
1299 // certainly gain from analysis of platform and environment.
1300 void Arguments::set_cms_and_parnew_gc_flags() {
1301 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1302 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1303 assert(UseParNewGC, "ParNew should always be used with CMS");
1304
1305 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1306 disable_adaptive_size_policy("UseConcMarkSweepGC");
1307
1308 set_parnew_gc_flags();
1309
1310 size_t max_heap = align_size_down(MaxHeapSize,
1311 CardTableRS::ct_max_alignment_constraint());
1312
1313 // Now make adjustments for CMS
1314 intx tenuring_default = (intx)6;
1315 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1316
1317 // Preferred young gen size for "short" pauses:
1318 // upper bound depends on # of threads and NewRatio.
1319 const uintx parallel_gc_threads =
1320 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1321 const size_t preferred_max_new_size_unaligned =
1322 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1323 size_t preferred_max_new_size =
1324 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1325
1326 // Unless explicitly requested otherwise, size young gen
1327 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1328
1329 // If either MaxNewSize or NewRatio is set on the command line,
1330 // assume the user is trying to set the size of the young gen.
1331 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1332
1333 // Set MaxNewSize to our calculated preferred_max_new_size unless
1334 // NewSize was set on the command line and it is larger than
1335 // preferred_max_new_size.
1336 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1337 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1338 } else {
1339 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1340 }
1341 if (PrintGCDetails && Verbose) {
1342 // Too early to use gclog_or_tty
1343 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1344 }
1345
1346 // Code along this path potentially sets NewSize and OldSize
1347 if (PrintGCDetails && Verbose) {
1348 // Too early to use gclog_or_tty
1349 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1350 " initial_heap_size: " SIZE_FORMAT
1351 " max_heap: " SIZE_FORMAT,
1352 min_heap_size(), InitialHeapSize, max_heap);
1353 }
1354 size_t min_new = preferred_max_new_size;
1355 if (FLAG_IS_CMDLINE(NewSize)) {
1356 min_new = NewSize;
1357 }
1358 if (max_heap > min_new && min_heap_size() > min_new) {
1359 // Unless explicitly requested otherwise, make young gen
1360 // at least min_new, and at most preferred_max_new_size.
1361 if (FLAG_IS_DEFAULT(NewSize)) {
1362 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1363 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1364 if (PrintGCDetails && Verbose) {
1365 // Too early to use gclog_or_tty
1366 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1367 }
1368 }
1369 // Unless explicitly requested otherwise, size old gen
1370 // so it's NewRatio x of NewSize.
1371 if (FLAG_IS_DEFAULT(OldSize)) {
1372 if (max_heap > NewSize) {
1373 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1374 if (PrintGCDetails && Verbose) {
1375 // Too early to use gclog_or_tty
1376 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1377 }
1378 }
1379 }
1380 }
1381 }
1382 // Unless explicitly requested otherwise, definitely
1383 // promote all objects surviving "tenuring_default" scavenges.
1384 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1385 FLAG_IS_DEFAULT(SurvivorRatio)) {
1386 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1387 }
1388 // If we decided above (or user explicitly requested)
1389 // `promote all' (via MaxTenuringThreshold := 0),
1390 // prefer minuscule survivor spaces so as not to waste
1391 // space for (non-existent) survivors
1392 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1393 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1394 }
1395
1396 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1397 // but rather the number of free blocks of a given size that are used when
1398 // replenishing the local per-worker free list caches.
1399 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1400 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1401 // OldPLAB sizing manually turned off: Use a larger default setting,
1402 // unless it was manually specified. This is because a too-low value
1403 // will slow down scavenges.
1404 FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1405 } else {
1406 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1407 }
1408 }
1409
1410 // If either of the static initialization defaults have changed, note this
1411 // modification.
1412 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1413 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1414 }
1415 if (PrintGCDetails && Verbose) {
1416 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1417 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1418 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1419 }
1420 }
1421 #endif // INCLUDE_ALL_GCS
1422
1423 void set_object_alignment() {
1424 // Object alignment.
1425 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1426 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1427 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1428 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1429 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1430 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1431
1432 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1433 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1434
1435 // Oop encoding heap max
1436 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1437
1438 #if INCLUDE_ALL_GCS
1439 // Set CMS global values
1440 CompactibleFreeListSpace::set_cms_values();
1441 #endif // INCLUDE_ALL_GCS
1442 }
1443
1444 bool verify_object_alignment() {
1445 // Object alignment.
1446 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1447 jio_fprintf(defaultStream::error_stream(),
1448 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1449 (int)ObjectAlignmentInBytes);
1450 return false;
1451 }
1452 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1453 jio_fprintf(defaultStream::error_stream(),
1454 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1455 (int)ObjectAlignmentInBytes, BytesPerLong);
1456 return false;
1457 }
1458 // It does not make sense to have big object alignment
1459 // since a space lost due to alignment will be greater
1460 // then a saved space from compressed oops.
1461 if ((int)ObjectAlignmentInBytes > 256) {
1462 jio_fprintf(defaultStream::error_stream(),
1463 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1464 (int)ObjectAlignmentInBytes);
1465 return false;
1466 }
1467 // In case page size is very small.
1468 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1469 jio_fprintf(defaultStream::error_stream(),
1470 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1471 (int)ObjectAlignmentInBytes, os::vm_page_size());
1472 return false;
1473 }
1474 if(SurvivorAlignmentInBytes == 0) {
1475 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1476 } else {
1477 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1478 jio_fprintf(defaultStream::error_stream(),
1479 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1480 (int)SurvivorAlignmentInBytes);
1481 return false;
1482 }
1483 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1484 jio_fprintf(defaultStream::error_stream(),
1485 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1486 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1487 return false;
1488 }
1489 }
1490 return true;
1491 }
1492
1493 size_t Arguments::max_heap_for_compressed_oops() {
1494 // Avoid sign flip.
1495 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1496 // We need to fit both the NULL page and the heap into the memory budget, while
1497 // keeping alignment constraints of the heap. To guarantee the latter, as the
1498 // NULL page is located before the heap, we pad the NULL page to the conservative
1499 // maximum alignment that the GC may ever impose upon the heap.
1500 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1501 _conservative_max_heap_alignment);
1502
1503 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1504 NOT_LP64(ShouldNotReachHere(); return 0);
1505 }
1506
1507 bool Arguments::should_auto_select_low_pause_collector() {
1508 if (UseAutoGCSelectPolicy &&
1509 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1510 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1511 if (PrintGCDetails) {
1512 // Cannot use gclog_or_tty yet.
1513 tty->print_cr("Automatic selection of the low pause collector"
1514 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1515 }
1516 return true;
1517 }
1518 return false;
1519 }
1520
1521 void Arguments::set_use_compressed_oops() {
1522 #ifndef ZERO
1523 #ifdef _LP64
1524 // MaxHeapSize is not set up properly at this point, but
1525 // the only value that can override MaxHeapSize if we are
1526 // to use UseCompressedOops is InitialHeapSize.
1527 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1528
1529 if (max_heap_size <= max_heap_for_compressed_oops()) {
1530 #if !defined(COMPILER1) || defined(TIERED)
1531 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1532 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1533 }
1534 #endif
1535 } else {
1536 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1537 warning("Max heap size too large for Compressed Oops");
1538 FLAG_SET_DEFAULT(UseCompressedOops, false);
1539 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1540 }
1541 }
1542 #endif // _LP64
1543 #endif // ZERO
1544 }
1545
1546
1547 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1548 // set_use_compressed_oops().
1549 void Arguments::set_use_compressed_klass_ptrs() {
1550 #ifndef ZERO
1551 #ifdef _LP64
1552 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1553 if (!UseCompressedOops) {
1554 if (UseCompressedClassPointers) {
1555 warning("UseCompressedClassPointers requires UseCompressedOops");
1556 }
1557 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1558 } else {
1559 // Turn on UseCompressedClassPointers too
1560 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1561 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1562 }
1563 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1564 if (UseCompressedClassPointers) {
1565 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1566 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1567 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1568 }
1569 }
1570 }
1571 #endif // _LP64
1572 #endif // !ZERO
1573 }
1574
1575 void Arguments::set_conservative_max_heap_alignment() {
1576 // The conservative maximum required alignment for the heap is the maximum of
1577 // the alignments imposed by several sources: any requirements from the heap
1578 // itself, the collector policy and the maximum page size we may run the VM
1579 // with.
1580 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1581 #if INCLUDE_ALL_GCS
1582 if (UseParallelGC) {
1583 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1584 } else if (UseG1GC) {
1585 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1586 }
1587 #endif // INCLUDE_ALL_GCS
1588 _conservative_max_heap_alignment = MAX4(heap_alignment,
1589 (size_t)os::vm_allocation_granularity(),
1590 os::max_page_size(),
1591 CollectorPolicy::compute_heap_alignment());
1592 }
1593
1594 void Arguments::select_gc_ergonomically() {
1595 if (os::is_server_class_machine()) {
1596 if (should_auto_select_low_pause_collector()) {
1597 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1598 } else {
1599 FLAG_SET_ERGO(bool, UseParallelGC, true);
1600 }
1601 }
1602 }
1603
1604 void Arguments::select_gc() {
1605 if (!gc_selected()) {
1606 ArgumentsExt::select_gc_ergonomically();
1607 }
1608 }
1609
1610 void Arguments::set_ergonomics_flags() {
1611 select_gc();
1612
1613 #ifdef COMPILER2
1614 // Shared spaces work fine with other GCs but causes bytecode rewriting
1615 // to be disabled, which hurts interpreter performance and decreases
1616 // server performance. When -server is specified, keep the default off
1617 // unless it is asked for. Future work: either add bytecode rewriting
1618 // at link time, or rewrite bytecodes in non-shared methods.
1619 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1620 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1621 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1622 }
1623 #endif
1624
1625 set_conservative_max_heap_alignment();
1626
1627 #ifndef ZERO
1628 #ifdef _LP64
1629 set_use_compressed_oops();
1630
1631 // set_use_compressed_klass_ptrs() must be called after calling
1632 // set_use_compressed_oops().
1633 set_use_compressed_klass_ptrs();
1634
1635 // Also checks that certain machines are slower with compressed oops
1636 // in vm_version initialization code.
1637 #endif // _LP64
1638 #endif // !ZERO
1639 }
1640
1641 void Arguments::set_parallel_gc_flags() {
1642 assert(UseParallelGC || UseParallelOldGC, "Error");
1643 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1644 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1645 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1646 }
1647 FLAG_SET_DEFAULT(UseParallelGC, true);
1648
1649 // If no heap maximum was requested explicitly, use some reasonable fraction
1650 // of the physical memory, up to a maximum of 1GB.
1651 FLAG_SET_DEFAULT(ParallelGCThreads,
1652 Abstract_VM_Version::parallel_worker_threads());
1653 if (ParallelGCThreads == 0) {
1654 jio_fprintf(defaultStream::error_stream(),
1655 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1656 vm_exit(1);
1657 }
1658
1659 if (UseAdaptiveSizePolicy) {
1660 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1661 // unless the user actually sets these flags.
1662 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1663 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1664 _min_heap_free_ratio = MinHeapFreeRatio;
1665 }
1666 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1667 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1668 _max_heap_free_ratio = MaxHeapFreeRatio;
1669 }
1670 }
1671
1672 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1673 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1674 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1675 // See CR 6362902 for details.
1676 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1677 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1678 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1679 }
1680 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1681 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1682 }
1683 }
1684
1685 if (UseParallelOldGC) {
1686 // Par compact uses lower default values since they are treated as
1687 // minimums. These are different defaults because of the different
1688 // interpretation and are not ergonomically set.
1689 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1690 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1691 }
1692 }
1693 }
1694
1695 void Arguments::set_g1_gc_flags() {
1696 assert(UseG1GC, "Error");
1697 #ifdef COMPILER1
1698 FastTLABRefill = false;
1699 #endif
1700 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1701 if (ParallelGCThreads == 0) {
1702 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1703 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1704 }
1705
1706 #if INCLUDE_ALL_GCS
1707 if (G1ConcRefinementThreads == 0) {
1708 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1709 }
1710 #endif
1711
1712 // MarkStackSize will be set (if it hasn't been set by the user)
1713 // when concurrent marking is initialized.
1714 // Its value will be based upon the number of parallel marking threads.
1715 // But we do set the maximum mark stack size here.
1716 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1717 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1718 }
1719
1720 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1721 // In G1, we want the default GC overhead goal to be higher than
1722 // say in PS. So we set it here to 10%. Otherwise the heap might
1723 // be expanded more aggressively than we would like it to. In
1724 // fact, even 10% seems to not be high enough in some cases
1725 // (especially small GC stress tests that the main thing they do
1726 // is allocation). We might consider increase it further.
1727 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1728 }
1729
1730 if (PrintGCDetails && Verbose) {
1731 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1732 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1733 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1734 }
1735 }
1736
1737 #if !INCLUDE_ALL_GCS
1738 #ifdef ASSERT
1739 static bool verify_serial_gc_flags() {
1740 return (UseSerialGC &&
1741 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1742 UseParallelGC || UseParallelOldGC));
1743 }
1744 #endif // ASSERT
1745 #endif // INCLUDE_ALL_GCS
1746
1747 void Arguments::set_gc_specific_flags() {
1748 #if INCLUDE_ALL_GCS
1749 // Set per-collector flags
1750 if (UseParallelGC || UseParallelOldGC) {
1751 set_parallel_gc_flags();
1752 } else if (UseConcMarkSweepGC) {
1753 set_cms_and_parnew_gc_flags();
1754 } else if (UseG1GC) {
1755 set_g1_gc_flags();
1756 }
1757 check_deprecated_gc_flags();
1758 if (AssumeMP && !UseSerialGC) {
1759 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1760 warning("If the number of processors is expected to increase from one, then"
1761 " you should configure the number of parallel GC threads appropriately"
1762 " using -XX:ParallelGCThreads=N");
1763 }
1764 }
1765 if (MinHeapFreeRatio == 100) {
1766 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1767 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1768 }
1769 #else // INCLUDE_ALL_GCS
1770 assert(verify_serial_gc_flags(), "SerialGC unset");
1771 #endif // INCLUDE_ALL_GCS
1772 }
1773
1774 julong Arguments::limit_by_allocatable_memory(julong limit) {
1775 julong max_allocatable;
1776 julong result = limit;
1777 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1778 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1779 }
1780 return result;
1781 }
1782
1783 // Use static initialization to get the default before parsing
1784 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1785
1786 void Arguments::set_heap_size() {
1787 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1788 // Deprecated flag
1789 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1790 }
1791
1792 const julong phys_mem =
1793 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1794 : (julong)MaxRAM;
1795
1796 // If the maximum heap size has not been set with -Xmx,
1797 // then set it as fraction of the size of physical memory,
1798 // respecting the maximum and minimum sizes of the heap.
1799 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1800 julong reasonable_max = phys_mem / MaxRAMFraction;
1801
1802 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1803 // Small physical memory, so use a minimum fraction of it for the heap
1804 reasonable_max = phys_mem / MinRAMFraction;
1805 } else {
1806 // Not-small physical memory, so require a heap at least
1807 // as large as MaxHeapSize
1808 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1809 }
1810 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1811 // Limit the heap size to ErgoHeapSizeLimit
1812 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1813 }
1814 if (UseCompressedOops) {
1815 // Limit the heap size to the maximum possible when using compressed oops
1816 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1817
1818 // HeapBaseMinAddress can be greater than default but not less than.
1819 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1820 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1821 // matches compressed oops printing flags
1822 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1823 jio_fprintf(defaultStream::error_stream(),
1824 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1825 " (" UINTX_FORMAT "G) which is greater than value given "
1826 UINTX_FORMAT "\n",
1827 DefaultHeapBaseMinAddress,
1828 DefaultHeapBaseMinAddress/G,
1829 HeapBaseMinAddress);
1830 }
1831 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1832 }
1833 }
1834
1835 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1836 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1837 // but it should be not less than default MaxHeapSize.
1838 max_coop_heap -= HeapBaseMinAddress;
1839 }
1840 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1841 }
1842 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1843
1844 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1845 // An initial heap size was specified on the command line,
1846 // so be sure that the maximum size is consistent. Done
1847 // after call to limit_by_allocatable_memory because that
1848 // method might reduce the allocation size.
1849 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1850 }
1851
1852 if (PrintGCDetails && Verbose) {
1853 // Cannot use gclog_or_tty yet.
1854 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1855 }
1856 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1857 }
1858
1859 // If the minimum or initial heap_size have not been set or requested to be set
1860 // ergonomically, set them accordingly.
1861 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1862 julong reasonable_minimum = (julong)(OldSize + NewSize);
1863
1864 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1865
1866 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1867
1868 if (InitialHeapSize == 0) {
1869 julong reasonable_initial = phys_mem / InitialRAMFraction;
1870
1871 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1872 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1873
1874 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1875
1876 if (PrintGCDetails && Verbose) {
1877 // Cannot use gclog_or_tty yet.
1878 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1879 }
1880 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1881 }
1882 // If the minimum heap size has not been set (via -Xms),
1883 // synchronize with InitialHeapSize to avoid errors with the default value.
1884 if (min_heap_size() == 0) {
1885 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1886 if (PrintGCDetails && Verbose) {
1887 // Cannot use gclog_or_tty yet.
1888 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1889 }
1890 }
1891 }
1892 }
1893
1894 // This must be called after ergonomics because we want bytecode rewriting
1895 // if the server compiler is used, or if UseSharedSpaces is disabled.
1896 void Arguments::set_bytecode_flags() {
1897 // Better not attempt to store into a read-only space.
1898 if (UseSharedSpaces) {
1899 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1900 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1901 }
1902
1903 if (!RewriteBytecodes) {
1904 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1905 }
1906 }
1907
1908 // Aggressive optimization flags -XX:+AggressiveOpts
1909 void Arguments::set_aggressive_opts_flags() {
1910 #ifdef COMPILER2
1911 if (AggressiveUnboxing) {
1912 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1913 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1914 } else if (!EliminateAutoBox) {
1915 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1916 AggressiveUnboxing = false;
1917 }
1918 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1919 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1920 } else if (!DoEscapeAnalysis) {
1921 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1922 AggressiveUnboxing = false;
1923 }
1924 }
1925 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1926 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1927 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1928 }
1929 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1930 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1931 }
1932
1933 // Feed the cache size setting into the JDK
1934 char buffer[1024];
1935 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1936 add_property(buffer);
1937 }
1938 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1939 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1940 }
1941 #endif
1942
1943 if (AggressiveOpts) {
1944 // Sample flag setting code
1945 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1946 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1947 // }
1948 }
1949 }
1950
1951 //===========================================================================================================
1952 // Parsing of java.compiler property
1953
1954 void Arguments::process_java_compiler_argument(char* arg) {
1955 // For backwards compatibility, Djava.compiler=NONE or ""
1956 // causes us to switch to -Xint mode UNLESS -Xdebug
1957 // is also specified.
1958 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1959 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1960 }
1961 }
1962
1963 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1964 _sun_java_launcher = os::strdup_check_oom(launcher);
1965 }
1966
1967 bool Arguments::created_by_java_launcher() {
1968 assert(_sun_java_launcher != NULL, "property must have value");
1969 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1970 }
1971
1972 bool Arguments::sun_java_launcher_is_altjvm() {
1973 return _sun_java_launcher_is_altjvm;
1974 }
1975
1976 //===========================================================================================================
1977 // Parsing of main arguments
1978
1979 bool Arguments::verify_interval(uintx val, uintx min,
1980 uintx max, const char* name) {
1981 // Returns true iff value is in the inclusive interval [min..max]
1982 // false, otherwise.
1983 if (val >= min && val <= max) {
1984 return true;
1985 }
1986 jio_fprintf(defaultStream::error_stream(),
1987 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1988 " and " UINTX_FORMAT "\n",
1989 name, val, min, max);
1990 return false;
1991 }
1992
1993 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1994 // Returns true if given value is at least specified min threshold
1995 // false, otherwise.
1996 if (val >= min ) {
1997 return true;
1998 }
1999 jio_fprintf(defaultStream::error_stream(),
2000 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2001 name, val, min);
2002 return false;
2003 }
2004
2005 bool Arguments::verify_percentage(uintx value, const char* name) {
2006 if (is_percentage(value)) {
2007 return true;
2008 }
2009 jio_fprintf(defaultStream::error_stream(),
2010 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2011 name, value);
2012 return false;
2013 }
2014
2015 // check if do gclog rotation
2016 // +UseGCLogFileRotation is a must,
2017 // no gc log rotation when log file not supplied or
2018 // NumberOfGCLogFiles is 0
2019 void check_gclog_consistency() {
2020 if (UseGCLogFileRotation) {
2021 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2022 jio_fprintf(defaultStream::output_stream(),
2023 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2024 "where num_of_file > 0\n"
2025 "GC log rotation is turned off\n");
2026 UseGCLogFileRotation = false;
2027 }
2028 }
2029
2030 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2031 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2032 jio_fprintf(defaultStream::output_stream(),
2033 "GCLogFileSize changed to minimum 8K\n");
2034 }
2035 }
2036
2037 // This function is called for -Xloggc:<filename>, it can be used
2038 // to check if a given file name(or string) conforms to the following
2039 // specification:
2040 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2041 // %p and %t only allowed once. We only limit usage of filename not path
2042 bool is_filename_valid(const char *file_name) {
2043 const char* p = file_name;
2044 char file_sep = os::file_separator()[0];
2045 const char* cp;
2046 // skip prefix path
2047 for (cp = file_name; *cp != '\0'; cp++) {
2048 if (*cp == '/' || *cp == file_sep) {
2049 p = cp + 1;
2050 }
2051 }
2052
2053 int count_p = 0;
2054 int count_t = 0;
2055 while (*p != '\0') {
2056 if ((*p >= '0' && *p <= '9') ||
2057 (*p >= 'A' && *p <= 'Z') ||
2058 (*p >= 'a' && *p <= 'z') ||
2059 *p == '-' ||
2060 *p == '_' ||
2061 *p == '.') {
2062 p++;
2063 continue;
2064 }
2065 if (*p == '%') {
2066 if(*(p + 1) == 'p') {
2067 p += 2;
2068 count_p ++;
2069 continue;
2070 }
2071 if (*(p + 1) == 't') {
2072 p += 2;
2073 count_t ++;
2074 continue;
2075 }
2076 }
2077 return false;
2078 }
2079 return count_p < 2 && count_t < 2;
2080 }
2081
2082 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2083 if (!is_percentage(min_heap_free_ratio)) {
2084 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2085 return false;
2086 }
2087 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2088 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2089 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2090 MaxHeapFreeRatio);
2091 return false;
2092 }
2093 // This does not set the flag itself, but stores the value in a safe place for later usage.
2094 _min_heap_free_ratio = min_heap_free_ratio;
2095 return true;
2096 }
2097
2098 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2099 if (!is_percentage(max_heap_free_ratio)) {
2100 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2101 return false;
2102 }
2103 if (max_heap_free_ratio < MinHeapFreeRatio) {
2104 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2105 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2106 MinHeapFreeRatio);
2107 return false;
2108 }
2109 // This does not set the flag itself, but stores the value in a safe place for later usage.
2110 _max_heap_free_ratio = max_heap_free_ratio;
2111 return true;
2112 }
2113
2114 // Check consistency of GC selection
2115 bool Arguments::check_gc_consistency_user() {
2116 check_gclog_consistency();
2117 // Ensure that the user has not selected conflicting sets
2118 // of collectors.
2119 uint i = 0;
2120 if (UseSerialGC) i++;
2121 if (UseConcMarkSweepGC) i++;
2122 if (UseParallelGC || UseParallelOldGC) i++;
2123 if (UseG1GC) i++;
2124 if (i > 1) {
2125 jio_fprintf(defaultStream::error_stream(),
2126 "Conflicting collector combinations in option list; "
2127 "please refer to the release notes for the combinations "
2128 "allowed\n");
2129 return false;
2130 }
2131
2132 if (UseConcMarkSweepGC && !UseParNewGC) {
2133 jio_fprintf(defaultStream::error_stream(),
2134 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2135 return false;
2136 }
2137
2138 if (UseParNewGC && !UseConcMarkSweepGC) {
2139 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2140 // set up UseSerialGC properly, so that can't be used in the check here.
2141 jio_fprintf(defaultStream::error_stream(),
2142 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2143 return false;
2144 }
2145
2146 return true;
2147 }
2148
2149 void Arguments::check_deprecated_gc_flags() {
2150 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2151 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2152 }
2153 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2154 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2155 "and will likely be removed in future release");
2156 }
2157 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2158 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2159 "Use MaxRAMFraction instead.");
2160 }
2161 }
2162
2163 // Check stack pages settings
2164 bool Arguments::check_stack_pages()
2165 {
2166 bool status = true;
2167 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2168 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2169 // greater stack shadow pages can't generate instruction to bang stack
2170 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2171 return status;
2172 }
2173
2174 // Check the consistency of vm_init_args
2175 bool Arguments::check_vm_args_consistency() {
2176 // Method for adding checks for flag consistency.
2177 // The intent is to warn the user of all possible conflicts,
2178 // before returning an error.
2179 // Note: Needs platform-dependent factoring.
2180 bool status = true;
2181
2182 if (TLABRefillWasteFraction == 0) {
2183 jio_fprintf(defaultStream::error_stream(),
2184 "TLABRefillWasteFraction should be a denominator, "
2185 "not " SIZE_FORMAT "\n",
2186 TLABRefillWasteFraction);
2187 status = false;
2188 }
2189
2190 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2191 "AdaptiveSizePolicyWeight");
2192 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2193
2194 // Divide by bucket size to prevent a large size from causing rollover when
2195 // calculating amount of memory needed to be allocated for the String table.
2196 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2197 (max_uintx / StringTable::bucket_size()), "StringTable size");
2198
2199 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2200 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2201
2202 {
2203 // Using "else if" below to avoid printing two error messages if min > max.
2204 // This will also prevent us from reporting both min>100 and max>100 at the
2205 // same time, but that is less annoying than printing two identical errors IMHO.
2206 FormatBuffer<80> err_msg("%s","");
2207 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2208 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2209 status = false;
2210 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2211 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2212 status = false;
2213 }
2214 }
2215
2216 // Min/MaxMetaspaceFreeRatio
2217 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2218 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2219
2220 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2221 jio_fprintf(defaultStream::error_stream(),
2222 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2223 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2224 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2225 MinMetaspaceFreeRatio,
2226 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2227 MaxMetaspaceFreeRatio);
2228 status = false;
2229 }
2230
2231 // Trying to keep 100% free is not practical
2232 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2233
2234 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2235 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2236 }
2237
2238 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2239 // Settings to encourage splitting.
2240 if (!FLAG_IS_CMDLINE(NewRatio)) {
2241 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2242 }
2243 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2244 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2245 }
2246 }
2247
2248 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2249 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2250 }
2251
2252 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2253 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2254 if (GCTimeLimit == 100) {
2255 // Turn off gc-overhead-limit-exceeded checks
2256 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2257 }
2258
2259 status = status && check_gc_consistency_user();
2260 status = status && check_stack_pages();
2261
2262 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2263 "CMSIncrementalSafetyFactor");
2264
2265 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2266 // insists that we hold the requisite locks so that the iteration is
2267 // MT-safe. For the verification at start-up and shut-down, we don't
2268 // yet have a good way of acquiring and releasing these locks,
2269 // which are not visible at the CollectedHeap level. We want to
2270 // be able to acquire these locks and then do the iteration rather
2271 // than just disable the lock verification. This will be fixed under
2272 // bug 4788986.
2273 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2274 if (VerifyDuringStartup) {
2275 warning("Heap verification at start-up disabled "
2276 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2277 VerifyDuringStartup = false; // Disable verification at start-up
2278 }
2279
2280 if (VerifyBeforeExit) {
2281 warning("Heap verification at shutdown disabled "
2282 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2283 VerifyBeforeExit = false; // Disable verification at shutdown
2284 }
2285 }
2286
2287 // Note: only executed in non-PRODUCT mode
2288 if (!UseAsyncConcMarkSweepGC &&
2289 (ExplicitGCInvokesConcurrent ||
2290 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2291 jio_fprintf(defaultStream::error_stream(),
2292 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2293 " with -UseAsyncConcMarkSweepGC");
2294 status = false;
2295 }
2296
2297 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2298
2299 #if INCLUDE_ALL_GCS
2300 if (UseG1GC) {
2301 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2302 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2303 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2304
2305 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2306 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2307 "InitiatingHeapOccupancyPercent");
2308 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2309 "G1RefProcDrainInterval");
2310 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2311 "G1ConcMarkStepDurationMillis");
2312 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2313 "G1ConcRSHotCardLimit");
2314 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2315 "G1ConcRSLogCacheSize");
2316 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2317 "StringDeduplicationAgeThreshold");
2318 }
2319 if (UseConcMarkSweepGC) {
2320 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2321 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2322 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2323 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2324
2325 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2326
2327 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2328 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2329 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2330
2331 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2332
2333 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2334 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2335
2336 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2337 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2338 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2339
2340 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2341
2342 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2343
2344 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2345 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2346 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2347 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2348 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2349 }
2350
2351 if (UseParallelGC || UseParallelOldGC) {
2352 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2353 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2354
2355 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2356 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2357
2358 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2359 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2360
2361 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2362
2363 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2364 }
2365 #endif // INCLUDE_ALL_GCS
2366
2367 status = status && verify_interval(RefDiscoveryPolicy,
2368 ReferenceProcessor::DiscoveryPolicyMin,
2369 ReferenceProcessor::DiscoveryPolicyMax,
2370 "RefDiscoveryPolicy");
2371
2372 // Limit the lower bound of this flag to 1 as it is used in a division
2373 // expression.
2374 status = status && verify_interval(TLABWasteTargetPercent,
2375 1, 100, "TLABWasteTargetPercent");
2376
2377 status = status && verify_object_alignment();
2378
2379 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2380 "CompressedClassSpaceSize");
2381
2382 status = status && verify_interval(MarkStackSizeMax,
2383 1, (max_jint - 1), "MarkStackSizeMax");
2384 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2385
2386 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2387
2388 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2389
2390 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2391
2392 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2393 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2394
2395 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2396
2397 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2398 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2399 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2400 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2401
2402 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2403 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2404
2405 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2406 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2407 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2408
2409 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2410 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2411
2412 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2413 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2414 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2415 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2416
2417 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2418 #ifdef COMPILER1
2419 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2420 #endif
2421 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2422
2423 if (PrintNMTStatistics) {
2424 #if INCLUDE_NMT
2425 if (MemTracker::tracking_level() == NMT_off) {
2426 #endif // INCLUDE_NMT
2427 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2428 PrintNMTStatistics = false;
2429 #if INCLUDE_NMT
2430 }
2431 #endif
2432 }
2433
2434 // Need to limit the extent of the padding to reasonable size.
2435 // 8K is well beyond the reasonable HW cache line size, even with the
2436 // aggressive prefetching, while still leaving the room for segregating
2437 // among the distinct pages.
2438 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2441 ContendedPaddingWidth, 0, 8192);
2442 status = false;
2443 }
2444
2445 // Need to enforce the padding not to break the existing field alignments.
2446 // It is sufficient to check against the largest type size.
2447 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2450 ContendedPaddingWidth, BytesPerLong);
2451 status = false;
2452 }
2453
2454 // Check lower bounds of the code cache
2455 // Template Interpreter code is approximately 3X larger in debug builds.
2456 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2457 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2460 os::vm_page_size()/K);
2461 status = false;
2462 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2463 jio_fprintf(defaultStream::error_stream(),
2464 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2465 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2466 status = false;
2467 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2468 jio_fprintf(defaultStream::error_stream(),
2469 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2470 min_code_cache_size/K);
2471 status = false;
2472 } else if (ReservedCodeCacheSize > 2*G) {
2473 // Code cache size larger than MAXINT is not supported.
2474 jio_fprintf(defaultStream::error_stream(),
2475 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2476 (2*G)/M);
2477 status = false;
2478 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2479 jio_fprintf(defaultStream::error_stream(),
2480 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2481 min_code_cache_size/K);
2482 status = false;
2483 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2484 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2485 jio_fprintf(defaultStream::error_stream(),
2486 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2487 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2488 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2489 status = false;
2490 }
2491
2492 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2493 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2494 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2495 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2496
2497
2498 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2499 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2500 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2501 // Check the minimum number of compiler threads
2502 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2503
2504 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2505 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2506 }
2507
2508 return status;
2509 }
2510
2511 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2512 const char* option_type) {
2513 if (ignore) return false;
2514
2515 const char* spacer = " ";
2516 if (option_type == NULL) {
2517 option_type = ++spacer; // Set both to the empty string.
2518 }
2519
2520 if (os::obsolete_option(option)) {
2521 jio_fprintf(defaultStream::error_stream(),
2522 "Obsolete %s%soption: %s\n", option_type, spacer,
2523 option->optionString);
2524 return false;
2525 } else {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "Unrecognized %s%soption: %s\n", option_type, spacer,
2528 option->optionString);
2529 return true;
2530 }
2531 }
2532
2533 static const char* user_assertion_options[] = {
2534 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2535 };
2536
2537 static const char* system_assertion_options[] = {
2538 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2539 };
2540
2541 bool Arguments::parse_uintx(const char* value,
2542 uintx* uintx_arg,
2543 uintx min_size) {
2544
2545 // Check the sign first since atomull() parses only unsigned values.
2546 bool value_is_positive = !(*value == '-');
2547
2548 if (value_is_positive) {
2549 julong n;
2550 bool good_return = atomull(value, &n);
2551 if (good_return) {
2552 bool above_minimum = n >= min_size;
2553 bool value_is_too_large = n > max_uintx;
2554
2555 if (above_minimum && !value_is_too_large) {
2556 *uintx_arg = n;
2557 return true;
2558 }
2559 }
2560 }
2561 return false;
2562 }
2563
2564 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2565 julong* long_arg,
2566 julong min_size) {
2567 if (!atomull(s, long_arg)) return arg_unreadable;
2568 return check_memory_size(*long_arg, min_size);
2569 }
2570
2571 // Parse JavaVMInitArgs structure
2572
2573 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2574 // For components of the system classpath.
2575 SysClassPath scp(Arguments::get_sysclasspath());
2576 bool scp_assembly_required = false;
2577
2578 // Save default settings for some mode flags
2579 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2580 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2581 Arguments::_ClipInlining = ClipInlining;
2582 Arguments::_BackgroundCompilation = BackgroundCompilation;
2583
2584 // Setup flags for mixed which is the default
2585 set_mode_flags(_mixed);
2586
2587 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2588 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2589 if (result != JNI_OK) {
2590 return result;
2591 }
2592
2593 // Parse JavaVMInitArgs structure passed in
2594 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2595 if (result != JNI_OK) {
2596 return result;
2597 }
2598
2599 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2600 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2601 if (result != JNI_OK) {
2602 return result;
2603 }
2604
2605 // Do final processing now that all arguments have been parsed
2606 result = finalize_vm_init_args(&scp, scp_assembly_required);
2607 if (result != JNI_OK) {
2608 return result;
2609 }
2610
2611 return JNI_OK;
2612 }
2613
2614 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2615 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2616 // are dealing with -agentpath (case where name is a path), otherwise with
2617 // -agentlib
2618 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2619 char *_name;
2620 const char *_hprof = "hprof", *_jdwp = "jdwp";
2621 size_t _len_hprof, _len_jdwp, _len_prefix;
2622
2623 if (is_path) {
2624 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2625 return false;
2626 }
2627
2628 _name++; // skip past last path separator
2629 _len_prefix = strlen(JNI_LIB_PREFIX);
2630
2631 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2632 return false;
2633 }
2634
2635 _name += _len_prefix;
2636 _len_hprof = strlen(_hprof);
2637 _len_jdwp = strlen(_jdwp);
2638
2639 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2640 _name += _len_hprof;
2641 }
2642 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2643 _name += _len_jdwp;
2644 }
2645 else {
2646 return false;
2647 }
2648
2649 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2650 return false;
2651 }
2652
2653 return true;
2654 }
2655
2656 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2657 return true;
2658 }
2659
2660 return false;
2661 }
2662
2663 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2664 SysClassPath* scp_p,
2665 bool* scp_assembly_required_p,
2666 Flag::Flags origin) {
2667 // Remaining part of option string
2668 const char* tail;
2669
2670 // iterate over arguments
2671 for (int index = 0; index < args->nOptions; index++) {
2672 bool is_absolute_path = false; // for -agentpath vs -agentlib
2673
2674 const JavaVMOption* option = args->options + index;
2675
2676 if (!match_option(option, "-Djava.class.path", &tail) &&
2677 !match_option(option, "-Dsun.java.command", &tail) &&
2678 !match_option(option, "-Dsun.java.launcher", &tail)) {
2679
2680 // add all jvm options to the jvm_args string. This string
2681 // is used later to set the java.vm.args PerfData string constant.
2682 // the -Djava.class.path and the -Dsun.java.command options are
2683 // omitted from jvm_args string as each have their own PerfData
2684 // string constant object.
2685 build_jvm_args(option->optionString);
2686 }
2687
2688 // -verbose:[class/gc/jni]
2689 if (match_option(option, "-verbose", &tail)) {
2690 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2691 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2692 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2693 } else if (!strcmp(tail, ":gc")) {
2694 FLAG_SET_CMDLINE(bool, PrintGC, true);
2695 } else if (!strcmp(tail, ":jni")) {
2696 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2697 }
2698 // -da / -ea / -disableassertions / -enableassertions
2699 // These accept an optional class/package name separated by a colon, e.g.,
2700 // -da:java.lang.Thread.
2701 } else if (match_option(option, user_assertion_options, &tail, true)) {
2702 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2703 if (*tail == '\0') {
2704 JavaAssertions::setUserClassDefault(enable);
2705 } else {
2706 assert(*tail == ':', "bogus match by match_option()");
2707 JavaAssertions::addOption(tail + 1, enable);
2708 }
2709 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2710 } else if (match_option(option, system_assertion_options, &tail, false)) {
2711 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2712 JavaAssertions::setSystemClassDefault(enable);
2713 // -bootclasspath:
2714 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2715 scp_p->reset_path(tail);
2716 *scp_assembly_required_p = true;
2717 // -bootclasspath/a:
2718 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2719 scp_p->add_suffix(tail);
2720 *scp_assembly_required_p = true;
2721 // -bootclasspath/p:
2722 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2723 scp_p->add_prefix(tail);
2724 *scp_assembly_required_p = true;
2725 // -Xrun
2726 } else if (match_option(option, "-Xrun", &tail)) {
2727 if (tail != NULL) {
2728 const char* pos = strchr(tail, ':');
2729 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2730 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2731 name[len] = '\0';
2732
2733 char *options = NULL;
2734 if(pos != NULL) {
2735 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2736 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2737 }
2738 #if !INCLUDE_JVMTI
2739 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2740 jio_fprintf(defaultStream::error_stream(),
2741 "Profiling and debugging agents are not supported in this VM\n");
2742 return JNI_ERR;
2743 }
2744 #endif // !INCLUDE_JVMTI
2745 add_init_library(name, options);
2746 }
2747 // -agentlib and -agentpath
2748 } else if (match_option(option, "-agentlib:", &tail) ||
2749 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2750 if(tail != NULL) {
2751 const char* pos = strchr(tail, '=');
2752 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2753 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2754 name[len] = '\0';
2755
2756 char *options = NULL;
2757 if(pos != NULL) {
2758 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2759 }
2760 #if !INCLUDE_JVMTI
2761 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2762 jio_fprintf(defaultStream::error_stream(),
2763 "Profiling and debugging agents are not supported in this VM\n");
2764 return JNI_ERR;
2765 }
2766 #endif // !INCLUDE_JVMTI
2767 add_init_agent(name, options, is_absolute_path);
2768 }
2769 // -javaagent
2770 } else if (match_option(option, "-javaagent:", &tail)) {
2771 #if !INCLUDE_JVMTI
2772 jio_fprintf(defaultStream::error_stream(),
2773 "Instrumentation agents are not supported in this VM\n");
2774 return JNI_ERR;
2775 #else
2776 if(tail != NULL) {
2777 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2778 add_init_agent("instrument", options, false);
2779 }
2780 #endif // !INCLUDE_JVMTI
2781 // -Xnoclassgc
2782 } else if (match_option(option, "-Xnoclassgc")) {
2783 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2784 // -Xconcgc
2785 } else if (match_option(option, "-Xconcgc")) {
2786 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2787 // -Xnoconcgc
2788 } else if (match_option(option, "-Xnoconcgc")) {
2789 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2790 // -Xbatch
2791 } else if (match_option(option, "-Xbatch")) {
2792 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2793 // -Xmn for compatibility with other JVM vendors
2794 } else if (match_option(option, "-Xmn", &tail)) {
2795 julong long_initial_young_size = 0;
2796 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2797 if (errcode != arg_in_range) {
2798 jio_fprintf(defaultStream::error_stream(),
2799 "Invalid initial young generation size: %s\n", option->optionString);
2800 describe_range_error(errcode);
2801 return JNI_EINVAL;
2802 }
2803 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2804 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2805 // -Xms
2806 } else if (match_option(option, "-Xms", &tail)) {
2807 julong long_initial_heap_size = 0;
2808 // an initial heap size of 0 means automatically determine
2809 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2810 if (errcode != arg_in_range) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "Invalid initial heap size: %s\n", option->optionString);
2813 describe_range_error(errcode);
2814 return JNI_EINVAL;
2815 }
2816 set_min_heap_size((uintx)long_initial_heap_size);
2817 // Currently the minimum size and the initial heap sizes are the same.
2818 // Can be overridden with -XX:InitialHeapSize.
2819 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2820 // -Xmx
2821 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2822 julong long_max_heap_size = 0;
2823 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2824 if (errcode != arg_in_range) {
2825 jio_fprintf(defaultStream::error_stream(),
2826 "Invalid maximum heap size: %s\n", option->optionString);
2827 describe_range_error(errcode);
2828 return JNI_EINVAL;
2829 }
2830 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2831 // Xmaxf
2832 } else if (match_option(option, "-Xmaxf", &tail)) {
2833 char* err;
2834 int maxf = (int)(strtod(tail, &err) * 100);
2835 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2836 jio_fprintf(defaultStream::error_stream(),
2837 "Bad max heap free percentage size: %s\n",
2838 option->optionString);
2839 return JNI_EINVAL;
2840 } else {
2841 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2842 }
2843 // Xminf
2844 } else if (match_option(option, "-Xminf", &tail)) {
2845 char* err;
2846 int minf = (int)(strtod(tail, &err) * 100);
2847 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Bad min heap free percentage size: %s\n",
2850 option->optionString);
2851 return JNI_EINVAL;
2852 } else {
2853 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2854 }
2855 // -Xss
2856 } else if (match_option(option, "-Xss", &tail)) {
2857 julong long_ThreadStackSize = 0;
2858 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2859 if (errcode != arg_in_range) {
2860 jio_fprintf(defaultStream::error_stream(),
2861 "Invalid thread stack size: %s\n", option->optionString);
2862 describe_range_error(errcode);
2863 return JNI_EINVAL;
2864 }
2865 // Internally track ThreadStackSize in units of 1024 bytes.
2866 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2867 round_to((int)long_ThreadStackSize, K) / K);
2868 // -Xoss
2869 } else if (match_option(option, "-Xoss", &tail)) {
2870 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2871 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2872 julong long_CodeCacheExpansionSize = 0;
2873 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2874 if (errcode != arg_in_range) {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2877 os::vm_page_size()/K);
2878 return JNI_EINVAL;
2879 }
2880 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2881 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2882 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2883 julong long_ReservedCodeCacheSize = 0;
2884
2885 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2886 if (errcode != arg_in_range) {
2887 jio_fprintf(defaultStream::error_stream(),
2888 "Invalid maximum code cache size: %s.\n", option->optionString);
2889 return JNI_EINVAL;
2890 }
2891 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2892 // -XX:NonNMethodCodeHeapSize=
2893 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2894 julong long_NonNMethodCodeHeapSize = 0;
2895
2896 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2897 if (errcode != arg_in_range) {
2898 jio_fprintf(defaultStream::error_stream(),
2899 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2900 return JNI_EINVAL;
2901 }
2902 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2903 // -XX:ProfiledCodeHeapSize=
2904 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2905 julong long_ProfiledCodeHeapSize = 0;
2906
2907 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2908 if (errcode != arg_in_range) {
2909 jio_fprintf(defaultStream::error_stream(),
2910 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2911 return JNI_EINVAL;
2912 }
2913 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2914 // -XX:NonProfiledCodeHeapSizee=
2915 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2916 julong long_NonProfiledCodeHeapSize = 0;
2917
2918 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2919 if (errcode != arg_in_range) {
2920 jio_fprintf(defaultStream::error_stream(),
2921 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2922 return JNI_EINVAL;
2923 }
2924 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2925 //-XX:IncreaseFirstTierCompileThresholdAt=
2926 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2927 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2928 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2931 option->optionString);
2932 return JNI_EINVAL;
2933 }
2934 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2935 // -green
2936 } else if (match_option(option, "-green")) {
2937 jio_fprintf(defaultStream::error_stream(),
2938 "Green threads support not available\n");
2939 return JNI_EINVAL;
2940 // -native
2941 } else if (match_option(option, "-native")) {
2942 // HotSpot always uses native threads, ignore silently for compatibility
2943 // -Xsqnopause
2944 } else if (match_option(option, "-Xsqnopause")) {
2945 // EVM option, ignore silently for compatibility
2946 // -Xrs
2947 } else if (match_option(option, "-Xrs")) {
2948 // Classic/EVM option, new functionality
2949 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2950 } else if (match_option(option, "-Xusealtsigs")) {
2951 // change default internal VM signals used - lower case for back compat
2952 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2953 // -Xoptimize
2954 } else if (match_option(option, "-Xoptimize")) {
2955 // EVM option, ignore silently for compatibility
2956 // -Xprof
2957 } else if (match_option(option, "-Xprof")) {
2958 #if INCLUDE_FPROF
2959 _has_profile = true;
2960 #else // INCLUDE_FPROF
2961 jio_fprintf(defaultStream::error_stream(),
2962 "Flat profiling is not supported in this VM.\n");
2963 return JNI_ERR;
2964 #endif // INCLUDE_FPROF
2965 // -Xconcurrentio
2966 } else if (match_option(option, "-Xconcurrentio")) {
2967 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2968 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2969 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2970 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2971 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2972
2973 // -Xinternalversion
2974 } else if (match_option(option, "-Xinternalversion")) {
2975 jio_fprintf(defaultStream::output_stream(), "%s\n",
2976 VM_Version::internal_vm_info_string());
2977 vm_exit(0);
2978 #ifndef PRODUCT
2979 // -Xprintflags
2980 } else if (match_option(option, "-Xprintflags")) {
2981 CommandLineFlags::printFlags(tty, false);
2982 vm_exit(0);
2983 #endif
2984 // -D
2985 } else if (match_option(option, "-D", &tail)) {
2986 const char* value;
2987 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2988 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2989 // abort if -Djava.endorsed.dirs is set
2990 jio_fprintf(defaultStream::output_stream(),
2991 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2992 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2993 return JNI_EINVAL;
2994 }
2995 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2996 *value != '\0' && strcmp(value, "\"\"") != 0) {
2997 // abort if -Djava.ext.dirs is set
2998 jio_fprintf(defaultStream::output_stream(),
2999 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3000 return JNI_EINVAL;
3001 }
3002
3003 if (!add_property(tail)) {
3004 return JNI_ENOMEM;
3005 }
3006 // Out of the box management support
3007 if (match_option(option, "-Dcom.sun.management", &tail)) {
3008 #if INCLUDE_MANAGEMENT
3009 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3010 #else
3011 jio_fprintf(defaultStream::output_stream(),
3012 "-Dcom.sun.management is not supported in this VM.\n");
3013 return JNI_ERR;
3014 #endif
3015 }
3016 // -Xint
3017 } else if (match_option(option, "-Xint")) {
3018 set_mode_flags(_int);
3019 // -Xmixed
3020 } else if (match_option(option, "-Xmixed")) {
3021 set_mode_flags(_mixed);
3022 // -Xcomp
3023 } else if (match_option(option, "-Xcomp")) {
3024 // for testing the compiler; turn off all flags that inhibit compilation
3025 set_mode_flags(_comp);
3026 // -Xshare:dump
3027 } else if (match_option(option, "-Xshare:dump")) {
3028 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3029 set_mode_flags(_int); // Prevent compilation, which creates objects
3030 // -Xshare:on
3031 } else if (match_option(option, "-Xshare:on")) {
3032 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3033 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3034 // -Xshare:auto
3035 } else if (match_option(option, "-Xshare:auto")) {
3036 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3037 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3038 // -Xshare:off
3039 } else if (match_option(option, "-Xshare:off")) {
3040 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3041 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3042 // -Xverify
3043 } else if (match_option(option, "-Xverify", &tail)) {
3044 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3045 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3046 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3047 } else if (strcmp(tail, ":remote") == 0) {
3048 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3049 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3050 } else if (strcmp(tail, ":none") == 0) {
3051 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3052 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3053 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3054 return JNI_EINVAL;
3055 }
3056 // -Xdebug
3057 } else if (match_option(option, "-Xdebug")) {
3058 // note this flag has been used, then ignore
3059 set_xdebug_mode(true);
3060 // -Xnoagent
3061 } else if (match_option(option, "-Xnoagent")) {
3062 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3063 } else if (match_option(option, "-Xboundthreads")) {
3064 // Bind user level threads to kernel threads (Solaris only)
3065 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3066 } else if (match_option(option, "-Xloggc:", &tail)) {
3067 // Redirect GC output to the file. -Xloggc:<filename>
3068 // ostream_init_log(), when called will use this filename
3069 // to initialize a fileStream.
3070 _gc_log_filename = os::strdup_check_oom(tail);
3071 if (!is_filename_valid(_gc_log_filename)) {
3072 jio_fprintf(defaultStream::output_stream(),
3073 "Invalid file name for use with -Xloggc: Filename can only contain the "
3074 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3075 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3076 return JNI_EINVAL;
3077 }
3078 FLAG_SET_CMDLINE(bool, PrintGC, true);
3079 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3080
3081 // JNI hooks
3082 } else if (match_option(option, "-Xcheck", &tail)) {
3083 if (!strcmp(tail, ":jni")) {
3084 #if !INCLUDE_JNI_CHECK
3085 warning("JNI CHECKING is not supported in this VM");
3086 #else
3087 CheckJNICalls = true;
3088 #endif // INCLUDE_JNI_CHECK
3089 } else if (is_bad_option(option, args->ignoreUnrecognized,
3090 "check")) {
3091 return JNI_EINVAL;
3092 }
3093 } else if (match_option(option, "vfprintf")) {
3094 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3095 } else if (match_option(option, "exit")) {
3096 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3097 } else if (match_option(option, "abort")) {
3098 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3099 // -XX:+AggressiveHeap
3100 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3101
3102 // This option inspects the machine and attempts to set various
3103 // parameters to be optimal for long-running, memory allocation
3104 // intensive jobs. It is intended for machines with large
3105 // amounts of cpu and memory.
3106
3107 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3108 // VM, but we may not be able to represent the total physical memory
3109 // available (like having 8gb of memory on a box but using a 32bit VM).
3110 // Thus, we need to make sure we're using a julong for intermediate
3111 // calculations.
3112 julong initHeapSize;
3113 julong total_memory = os::physical_memory();
3114
3115 if (total_memory < (julong)256*M) {
3116 jio_fprintf(defaultStream::error_stream(),
3117 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3118 vm_exit(1);
3119 }
3120
3121 // The heap size is half of available memory, or (at most)
3122 // all of possible memory less 160mb (leaving room for the OS
3123 // when using ISM). This is the maximum; because adaptive sizing
3124 // is turned on below, the actual space used may be smaller.
3125
3126 initHeapSize = MIN2(total_memory / (julong)2,
3127 total_memory - (julong)160*M);
3128
3129 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3130
3131 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3132 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3133 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3134 // Currently the minimum size and the initial heap sizes are the same.
3135 set_min_heap_size(initHeapSize);
3136 }
3137 if (FLAG_IS_DEFAULT(NewSize)) {
3138 // Make the young generation 3/8ths of the total heap.
3139 FLAG_SET_CMDLINE(uintx, NewSize,
3140 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3141 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3142 }
3143
3144 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3145 FLAG_SET_DEFAULT(UseLargePages, true);
3146 #endif
3147
3148 // Increase some data structure sizes for efficiency
3149 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3150 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3151 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3152
3153 // See the OldPLABSize comment below, but replace 'after promotion'
3154 // with 'after copying'. YoungPLABSize is the size of the survivor
3155 // space per-gc-thread buffers. The default is 4kw.
3156 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3157
3158 // OldPLABSize is the size of the buffers in the old gen that
3159 // UseParallelGC uses to promote live data that doesn't fit in the
3160 // survivor spaces. At any given time, there's one for each gc thread.
3161 // The default size is 1kw. These buffers are rarely used, since the
3162 // survivor spaces are usually big enough. For specjbb, however, there
3163 // are occasions when there's lots of live data in the young gen
3164 // and we end up promoting some of it. We don't have a definite
3165 // explanation for why bumping OldPLABSize helps, but the theory
3166 // is that a bigger PLAB results in retaining something like the
3167 // original allocation order after promotion, which improves mutator
3168 // locality. A minor effect may be that larger PLABs reduce the
3169 // number of PLAB allocation events during gc. The value of 8kw
3170 // was arrived at by experimenting with specjbb.
3171 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3172
3173 // Enable parallel GC and adaptive generation sizing
3174 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3175 FLAG_SET_DEFAULT(ParallelGCThreads,
3176 Abstract_VM_Version::parallel_worker_threads());
3177
3178 // Encourage steady state memory management
3179 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3180
3181 // This appears to improve mutator locality
3182 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3183
3184 // Get around early Solaris scheduling bug
3185 // (affinity vs other jobs on system)
3186 // but disallow DR and offlining (5008695).
3187 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3188
3189 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3190 // and the last option wins.
3191 } else if (match_option(option, "-XX:+NeverTenure")) {
3192 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3193 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3194 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3195 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3196 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3197 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3198 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3199 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3200 uintx max_tenuring_thresh = 0;
3201 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3202 jio_fprintf(defaultStream::error_stream(),
3203 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3204 }
3205 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3206
3207 if (MaxTenuringThreshold == 0) {
3208 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3209 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3210 } else {
3211 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3212 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3213 }
3214 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3215 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3216 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3217 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3218 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3219 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3220 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3221 #if defined(DTRACE_ENABLED)
3222 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3223 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3224 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3225 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3226 #else // defined(DTRACE_ENABLED)
3227 jio_fprintf(defaultStream::error_stream(),
3228 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3229 return JNI_EINVAL;
3230 #endif // defined(DTRACE_ENABLED)
3231 #ifdef ASSERT
3232 } else if (match_option(option, "-XX:+FullGCALot")) {
3233 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3234 // disable scavenge before parallel mark-compact
3235 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3236 #endif
3237 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3238 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3239 julong stack_size = 0;
3240 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3241 if (errcode != arg_in_range) {
3242 jio_fprintf(defaultStream::error_stream(),
3243 "Invalid mark stack size: %s\n", option->optionString);
3244 describe_range_error(errcode);
3245 return JNI_EINVAL;
3246 }
3247 jio_fprintf(defaultStream::error_stream(),
3248 "Please use -XX:MarkStackSize in place of "
3249 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3250 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3251 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3252 julong max_stack_size = 0;
3253 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3254 if (errcode != arg_in_range) {
3255 jio_fprintf(defaultStream::error_stream(),
3256 "Invalid maximum mark stack size: %s\n",
3257 option->optionString);
3258 describe_range_error(errcode);
3259 return JNI_EINVAL;
3260 }
3261 jio_fprintf(defaultStream::error_stream(),
3262 "Please use -XX:MarkStackSizeMax in place of "
3263 "-XX:CMSMarkStackSizeMax in the future\n");
3264 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3265 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3266 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3267 uintx conc_threads = 0;
3268 if (!parse_uintx(tail, &conc_threads, 1)) {
3269 jio_fprintf(defaultStream::error_stream(),
3270 "Invalid concurrent threads: %s\n", option->optionString);
3271 return JNI_EINVAL;
3272 }
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Please use -XX:ConcGCThreads in place of "
3275 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3276 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3277 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3278 julong max_direct_memory_size = 0;
3279 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3280 if (errcode != arg_in_range) {
3281 jio_fprintf(defaultStream::error_stream(),
3282 "Invalid maximum direct memory size: %s\n",
3283 option->optionString);
3284 describe_range_error(errcode);
3285 return JNI_EINVAL;
3286 }
3287 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3288 #if !INCLUDE_MANAGEMENT
3289 } else if (match_option(option, "-XX:+ManagementServer")) {
3290 jio_fprintf(defaultStream::error_stream(),
3291 "ManagementServer is not supported in this VM.\n");
3292 return JNI_ERR;
3293 #endif // INCLUDE_MANAGEMENT
3294 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3295 // Skip -XX:Flags= since that case has already been handled
3296 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3297 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3298 return JNI_EINVAL;
3299 }
3300 }
3301 // Unknown option
3302 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3303 return JNI_ERR;
3304 }
3305 }
3306
3307 // PrintSharedArchiveAndExit will turn on
3308 // -Xshare:on
3309 // -XX:+TraceClassPaths
3310 if (PrintSharedArchiveAndExit) {
3311 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3312 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3313 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3314 }
3315
3316 // Change the default value for flags which have different default values
3317 // when working with older JDKs.
3318 #ifdef LINUX
3319 if (JDK_Version::current().compare_major(6) <= 0 &&
3320 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3321 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3322 }
3323 #endif // LINUX
3324 fix_appclasspath();
3325 return JNI_OK;
3326 }
3327
3328 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3329 //
3330 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3331 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3332 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3333 // path is treated as the current directory.
3334 //
3335 // This causes problems with CDS, which requires that all directories specified in the classpath
3336 // must be empty. In most cases, applications do NOT want to load classes from the current
3337 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3338 // scripts compatible with CDS.
3339 void Arguments::fix_appclasspath() {
3340 if (IgnoreEmptyClassPaths) {
3341 const char separator = *os::path_separator();
3342 const char* src = _java_class_path->value();
3343
3344 // skip over all the leading empty paths
3345 while (*src == separator) {
3346 src ++;
3347 }
3348
3349 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3350 strncpy(copy, src, strlen(src) + 1);
3351
3352 // trim all trailing empty paths
3353 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3354 *tail = '\0';
3355 }
3356
3357 char from[3] = {separator, separator, '\0'};
3358 char to [2] = {separator, '\0'};
3359 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3360 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3361 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3362 }
3363
3364 _java_class_path->set_value(copy);
3365 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3366 }
3367
3368 if (!PrintSharedArchiveAndExit) {
3369 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3370 }
3371 }
3372
3373 static bool has_jar_files(const char* directory) {
3374 DIR* dir = os::opendir(directory);
3375 if (dir == NULL) return false;
3376
3377 struct dirent *entry;
3378 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3379 bool hasJarFile = false;
3380 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3381 const char* name = entry->d_name;
3382 const char* ext = name + strlen(name) - 4;
3383 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3384 }
3385 FREE_C_HEAP_ARRAY(char, dbuf);
3386 os::closedir(dir);
3387 return hasJarFile ;
3388 }
3389
3390 static int check_non_empty_dirs(const char* path) {
3391 const char separator = *os::path_separator();
3392 const char* const end = path + strlen(path);
3393 int nonEmptyDirs = 0;
3394 while (path < end) {
3395 const char* tmp_end = strchr(path, separator);
3396 if (tmp_end == NULL) {
3397 if (has_jar_files(path)) {
3398 nonEmptyDirs++;
3399 jio_fprintf(defaultStream::output_stream(),
3400 "Non-empty directory: %s\n", path);
3401 }
3402 path = end;
3403 } else {
3404 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3405 memcpy(dirpath, path, tmp_end - path);
3406 dirpath[tmp_end - path] = '\0';
3407 if (has_jar_files(dirpath)) {
3408 nonEmptyDirs++;
3409 jio_fprintf(defaultStream::output_stream(),
3410 "Non-empty directory: %s\n", dirpath);
3411 }
3412 FREE_C_HEAP_ARRAY(char, dirpath);
3413 path = tmp_end + 1;
3414 }
3415 }
3416 return nonEmptyDirs;
3417 }
3418
3419 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3420 // check if the default lib/endorsed directory exists; if so, error
3421 char path[JVM_MAXPATHLEN];
3422 const char* fileSep = os::file_separator();
3423 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3424
3425 if (CheckEndorsedAndExtDirs) {
3426 int nonEmptyDirs = 0;
3427 // check endorsed directory
3428 nonEmptyDirs += check_non_empty_dirs(path);
3429 // check the extension directories
3430 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3431 if (nonEmptyDirs > 0) {
3432 return JNI_ERR;
3433 }
3434 }
3435
3436 DIR* dir = os::opendir(path);
3437 if (dir != NULL) {
3438 jio_fprintf(defaultStream::output_stream(),
3439 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3440 "in modular form will be supported via the concept of upgradeable modules.\n");
3441 os::closedir(dir);
3442 return JNI_ERR;
3443 }
3444
3445 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3446 dir = os::opendir(path);
3447 if (dir != NULL) {
3448 jio_fprintf(defaultStream::output_stream(),
3449 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3450 "Use -classpath instead.\n.");
3451 os::closedir(dir);
3452 return JNI_ERR;
3453 }
3454
3455 if (scp_assembly_required) {
3456 // Assemble the bootclasspath elements into the final path.
3457 Arguments::set_sysclasspath(scp_p->combined_path());
3458 }
3459
3460 // This must be done after all arguments have been processed.
3461 // java_compiler() true means set to "NONE" or empty.
3462 if (java_compiler() && !xdebug_mode()) {
3463 // For backwards compatibility, we switch to interpreted mode if
3464 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3465 // not specified.
3466 set_mode_flags(_int);
3467 }
3468
3469 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3470 // but like -Xint, leave compilation thresholds unaffected.
3471 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3472 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3473 set_mode_flags(_int);
3474 }
3475
3476 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3477 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3478 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3479 }
3480
3481 #ifndef COMPILER2
3482 // Don't degrade server performance for footprint
3483 if (FLAG_IS_DEFAULT(UseLargePages) &&
3484 MaxHeapSize < LargePageHeapSizeThreshold) {
3485 // No need for large granularity pages w/small heaps.
3486 // Note that large pages are enabled/disabled for both the
3487 // Java heap and the code cache.
3488 FLAG_SET_DEFAULT(UseLargePages, false);
3489 }
3490
3491 #else
3492 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3493 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3494 }
3495 #endif
3496
3497 #ifndef TIERED
3498 // Tiered compilation is undefined.
3499 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3500 #endif
3501
3502 // If we are running in a headless jre, force java.awt.headless property
3503 // to be true unless the property has already been set.
3504 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3505 if (os::is_headless_jre()) {
3506 const char* headless = Arguments::get_property("java.awt.headless");
3507 if (headless == NULL) {
3508 char envbuffer[128];
3509 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3510 if (!add_property("java.awt.headless=true")) {
3511 return JNI_ENOMEM;
3512 }
3513 } else {
3514 char buffer[256];
3515 strcpy(buffer, "java.awt.headless=");
3516 strcat(buffer, envbuffer);
3517 if (!add_property(buffer)) {
3518 return JNI_ENOMEM;
3519 }
3520 }
3521 }
3522 }
3523
3524 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3525 // CMS can only be used with ParNew
3526 FLAG_SET_ERGO(bool, UseParNewGC, true);
3527 }
3528
3529 if (!check_vm_args_consistency()) {
3530 return JNI_ERR;
3531 }
3532
3533 return JNI_OK;
3534 }
3535
3536 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3537 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3538 scp_assembly_required_p);
3539 }
3540
3541 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3542 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3543 scp_assembly_required_p);
3544 }
3545
3546 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3547 const int N_MAX_OPTIONS = 64;
3548 const int OPTION_BUFFER_SIZE = 1024;
3549 char buffer[OPTION_BUFFER_SIZE];
3550
3551 // The variable will be ignored if it exceeds the length of the buffer.
3552 // Don't check this variable if user has special privileges
3553 // (e.g. unix su command).
3554 if (os::getenv(name, buffer, sizeof(buffer)) &&
3555 !os::have_special_privileges()) {
3556 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3557 jio_fprintf(defaultStream::error_stream(),
3558 "Picked up %s: %s\n", name, buffer);
3559 char* rd = buffer; // pointer to the input string (rd)
3560 int i;
3561 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3562 while (isspace(*rd)) rd++; // skip whitespace
3563 if (*rd == 0) break; // we re done when the input string is read completely
3564
3565 // The output, option string, overwrites the input string.
3566 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3567 // input string (rd).
3568 char* wrt = rd;
3569
3570 options[i++].optionString = wrt; // Fill in option
3571 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3572 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3573 int quote = *rd; // matching quote to look for
3574 rd++; // don't copy open quote
3575 while (*rd != quote) { // include everything (even spaces) up until quote
3576 if (*rd == 0) { // string termination means unmatched string
3577 jio_fprintf(defaultStream::error_stream(),
3578 "Unmatched quote in %s\n", name);
3579 return JNI_ERR;
3580 }
3581 *wrt++ = *rd++; // copy to option string
3582 }
3583 rd++; // don't copy close quote
3584 } else {
3585 *wrt++ = *rd++; // copy to option string
3586 }
3587 }
3588 // Need to check if we're done before writing a NULL,
3589 // because the write could be to the byte that rd is pointing to.
3590 if (*rd++ == 0) {
3591 *wrt = 0;
3592 break;
3593 }
3594 *wrt = 0; // Zero terminate option
3595 }
3596 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3597 JavaVMInitArgs vm_args;
3598 vm_args.version = JNI_VERSION_1_2;
3599 vm_args.options = options;
3600 vm_args.nOptions = i;
3601 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3602
3603 if (PrintVMOptions) {
3604 const char* tail;
3605 for (int i = 0; i < vm_args.nOptions; i++) {
3606 const JavaVMOption *option = vm_args.options + i;
3607 if (match_option(option, "-XX:", &tail)) {
3608 logOption(tail);
3609 }
3610 }
3611 }
3612
3613 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3614 }
3615 return JNI_OK;
3616 }
3617
3618 void Arguments::set_shared_spaces_flags() {
3619 if (DumpSharedSpaces) {
3620 if (RequireSharedSpaces) {
3621 warning("cannot dump shared archive while using shared archive");
3622 }
3623 UseSharedSpaces = false;
3624 #ifdef _LP64
3625 if (!UseCompressedOops || !UseCompressedClassPointers) {
3626 vm_exit_during_initialization(
3627 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3628 }
3629 } else {
3630 if (!UseCompressedOops || !UseCompressedClassPointers) {
3631 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3632 }
3633 #endif
3634 }
3635 }
3636
3637 #if !INCLUDE_ALL_GCS
3638 static void force_serial_gc() {
3639 FLAG_SET_DEFAULT(UseSerialGC, true);
3640 UNSUPPORTED_GC_OPTION(UseG1GC);
3641 UNSUPPORTED_GC_OPTION(UseParallelGC);
3642 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3643 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3644 UNSUPPORTED_GC_OPTION(UseParNewGC);
3645 }
3646 #endif // INCLUDE_ALL_GCS
3647
3648 // Sharing support
3649 // Construct the path to the archive
3650 static char* get_shared_archive_path() {
3651 char *shared_archive_path;
3652 if (SharedArchiveFile == NULL) {
3653 char jvm_path[JVM_MAXPATHLEN];
3654 os::jvm_path(jvm_path, sizeof(jvm_path));
3655 char *end = strrchr(jvm_path, *os::file_separator());
3656 if (end != NULL) *end = '\0';
3657 size_t jvm_path_len = strlen(jvm_path);
3658 size_t file_sep_len = strlen(os::file_separator());
3659 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3660 file_sep_len + 20, mtInternal);
3661 if (shared_archive_path != NULL) {
3662 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3663 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3664 strncat(shared_archive_path, "classes.jsa", 11);
3665 }
3666 } else {
3667 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3668 if (shared_archive_path != NULL) {
3669 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3670 }
3671 }
3672 return shared_archive_path;
3673 }
3674
3675 #ifndef PRODUCT
3676 // Determine whether LogVMOutput should be implicitly turned on.
3677 static bool use_vm_log() {
3678 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3679 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3680 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3681 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3682 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3683 return true;
3684 }
3685
3686 #ifdef COMPILER1
3687 if (PrintC1Statistics) {
3688 return true;
3689 }
3690 #endif // COMPILER1
3691
3692 #ifdef COMPILER2
3693 if (PrintOptoAssembly || PrintOptoStatistics) {
3694 return true;
3695 }
3696 #endif // COMPILER2
3697
3698 return false;
3699 }
3700 #endif // PRODUCT
3701
3702 // Parse entry point called from JNI_CreateJavaVM
3703
3704 jint Arguments::parse(const JavaVMInitArgs* args) {
3705
3706 // Remaining part of option string
3707 const char* tail;
3708
3709 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3710 const char* hotspotrc = ".hotspotrc";
3711 bool settings_file_specified = false;
3712 bool needs_hotspotrc_warning = false;
3713
3714 const char* flags_file;
3715 int index;
3716 for (index = 0; index < args->nOptions; index++) {
3717 const JavaVMOption *option = args->options + index;
3718 if (ArgumentsExt::process_options(option)) {
3719 continue;
3720 }
3721 if (match_option(option, "-XX:Flags=", &tail)) {
3722 flags_file = tail;
3723 settings_file_specified = true;
3724 continue;
3725 }
3726 if (match_option(option, "-XX:+PrintVMOptions")) {
3727 PrintVMOptions = true;
3728 continue;
3729 }
3730 if (match_option(option, "-XX:-PrintVMOptions")) {
3731 PrintVMOptions = false;
3732 continue;
3733 }
3734 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3735 IgnoreUnrecognizedVMOptions = true;
3736 continue;
3737 }
3738 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3739 IgnoreUnrecognizedVMOptions = false;
3740 continue;
3741 }
3742 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3743 CommandLineFlags::printFlags(tty, false);
3744 vm_exit(0);
3745 }
3746 #if INCLUDE_NMT
3747 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3748 // The launcher did not setup nmt environment variable properly.
3749 if (!MemTracker::check_launcher_nmt_support(tail)) {
3750 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3751 }
3752
3753 // Verify if nmt option is valid.
3754 if (MemTracker::verify_nmt_option()) {
3755 // Late initialization, still in single-threaded mode.
3756 if (MemTracker::tracking_level() >= NMT_summary) {
3757 MemTracker::init();
3758 }
3759 } else {
3760 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3761 }
3762 continue;
3763 }
3764 #endif
3765
3766
3767 #ifndef PRODUCT
3768 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3769 CommandLineFlags::printFlags(tty, true);
3770 vm_exit(0);
3771 }
3772 #endif
3773 }
3774
3775 if (IgnoreUnrecognizedVMOptions) {
3776 // uncast const to modify the flag args->ignoreUnrecognized
3777 *(jboolean*)(&args->ignoreUnrecognized) = true;
3778 }
3779
3780 // Parse specified settings file
3781 if (settings_file_specified) {
3782 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3783 return JNI_EINVAL;
3784 }
3785 } else {
3786 #ifdef ASSERT
3787 // Parse default .hotspotrc settings file
3788 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3789 return JNI_EINVAL;
3790 }
3791 #else
3792 struct stat buf;
3793 if (os::stat(hotspotrc, &buf) == 0) {
3794 needs_hotspotrc_warning = true;
3795 }
3796 #endif
3797 }
3798
3799 if (PrintVMOptions) {
3800 for (index = 0; index < args->nOptions; index++) {
3801 const JavaVMOption *option = args->options + index;
3802 if (match_option(option, "-XX:", &tail)) {
3803 logOption(tail);
3804 }
3805 }
3806 }
3807
3808 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3809 jint result = parse_vm_init_args(args);
3810 if (result != JNI_OK) {
3811 return result;
3812 }
3813
3814 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3815 SharedArchivePath = get_shared_archive_path();
3816 if (SharedArchivePath == NULL) {
3817 return JNI_ENOMEM;
3818 }
3819
3820 // Set up VerifySharedSpaces
3821 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3822 VerifySharedSpaces = true;
3823 }
3824
3825 // Delay warning until here so that we've had a chance to process
3826 // the -XX:-PrintWarnings flag
3827 if (needs_hotspotrc_warning) {
3828 warning("%s file is present but has been ignored. "
3829 "Run with -XX:Flags=%s to load the file.",
3830 hotspotrc, hotspotrc);
3831 }
3832
3833 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3834 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3835 #endif
3836
3837 #if INCLUDE_ALL_GCS
3838 #if (defined JAVASE_EMBEDDED || defined ARM)
3839 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3840 #endif
3841 #endif
3842
3843 ArgumentsExt::report_unsupported_options();
3844
3845 #ifndef PRODUCT
3846 if (TraceBytecodesAt != 0) {
3847 TraceBytecodes = true;
3848 }
3849 if (CountCompiledCalls) {
3850 if (UseCounterDecay) {
3851 warning("UseCounterDecay disabled because CountCalls is set");
3852 UseCounterDecay = false;
3853 }
3854 }
3855 #endif // PRODUCT
3856
3857 if (ScavengeRootsInCode == 0) {
3858 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3859 warning("forcing ScavengeRootsInCode non-zero");
3860 }
3861 ScavengeRootsInCode = 1;
3862 }
3863
3864 if (PrintGCDetails) {
3865 // Turn on -verbose:gc options as well
3866 PrintGC = true;
3867 }
3868
3869 // Set object alignment values.
3870 set_object_alignment();
3871
3872 #if !INCLUDE_ALL_GCS
3873 force_serial_gc();
3874 #endif // INCLUDE_ALL_GCS
3875 #if !INCLUDE_CDS
3876 if (DumpSharedSpaces || RequireSharedSpaces) {
3877 jio_fprintf(defaultStream::error_stream(),
3878 "Shared spaces are not supported in this VM\n");
3879 return JNI_ERR;
3880 }
3881 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3882 warning("Shared spaces are not supported in this VM");
3883 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3884 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3885 }
3886 no_shared_spaces("CDS Disabled");
3887 #endif // INCLUDE_CDS
3888
3889 return JNI_OK;
3890 }
3891
3892 jint Arguments::apply_ergo() {
3893
3894 // Set flags based on ergonomics.
3895 set_ergonomics_flags();
3896
3897 set_shared_spaces_flags();
3898
3899 // Check the GC selections again.
3900 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3901 return JNI_EINVAL;
3902 }
3903
3904 if (TieredCompilation) {
3905 set_tiered_flags();
3906 } else {
3907 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3908 if (CompilationPolicyChoice >= 2) {
3909 vm_exit_during_initialization(
3910 "Incompatible compilation policy selected", NULL);
3911 }
3912 // Scale CompileThreshold
3913 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3914 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3915 }
3916 }
3917
3918 #ifdef COMPILER2
3919 #ifndef PRODUCT
3920 if (PrintIdealGraphLevel > 0) {
3921 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3922 }
3923 #endif
3924 #endif
3925
3926 // Set heap size based on available physical memory
3927 set_heap_size();
3928
3929 ArgumentsExt::set_gc_specific_flags();
3930
3931 // Initialize Metaspace flags and alignments
3932 Metaspace::ergo_initialize();
3933
3934 // Set bytecode rewriting flags
3935 set_bytecode_flags();
3936
3937 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3938 set_aggressive_opts_flags();
3939
3940 // Turn off biased locking for locking debug mode flags,
3941 // which are subtly different from each other but neither works with
3942 // biased locking
3943 if (UseHeavyMonitors
3944 #ifdef COMPILER1
3945 || !UseFastLocking
3946 #endif // COMPILER1
3947 ) {
3948 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3949 // flag set to true on command line; warn the user that they
3950 // can't enable biased locking here
3951 warning("Biased Locking is not supported with locking debug flags"
3952 "; ignoring UseBiasedLocking flag." );
3953 }
3954 UseBiasedLocking = false;
3955 }
3956
3957 #ifdef ZERO
3958 // Clear flags not supported on zero.
3959 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3960 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3961 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3962 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3963 #endif // CC_INTERP
3964
3965 #ifdef COMPILER2
3966 if (!EliminateLocks) {
3967 EliminateNestedLocks = false;
3968 }
3969 if (!Inline) {
3970 IncrementalInline = false;
3971 }
3972 #ifndef PRODUCT
3973 if (!IncrementalInline) {
3974 AlwaysIncrementalInline = false;
3975 }
3976 #endif
3977 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3978 // nothing to use the profiling, turn if off
3979 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3980 }
3981 #endif
3982
3983 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3984 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3985 DebugNonSafepoints = true;
3986 }
3987
3988 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3989 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3990 }
3991
3992 #ifndef PRODUCT
3993 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3994 if (use_vm_log()) {
3995 LogVMOutput = true;
3996 }
3997 }
3998 #endif // PRODUCT
3999
4000 if (PrintCommandLineFlags) {
4001 CommandLineFlags::printSetFlags(tty);
4002 }
4003
4004 // Apply CPU specific policy for the BiasedLocking
4005 if (UseBiasedLocking) {
4006 if (!VM_Version::use_biased_locking() &&
4007 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4008 UseBiasedLocking = false;
4009 }
4010 }
4011 #ifdef COMPILER2
4012 if (!UseBiasedLocking || EmitSync != 0) {
4013 UseOptoBiasInlining = false;
4014 }
4015 #endif
4016
4017 return JNI_OK;
4018 }
4019
4020 jint Arguments::adjust_after_os() {
4021 if (UseNUMA) {
4022 if (UseParallelGC || UseParallelOldGC) {
4023 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4024 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4025 }
4026 }
4027 // UseNUMAInterleaving is set to ON for all collectors and
4028 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4029 // such as the parallel collector for Linux and Solaris will
4030 // interleave old gen and survivor spaces on top of NUMA
4031 // allocation policy for the eden space.
4032 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4033 // all platforms and ParallelGC on Windows will interleave all
4034 // of the heap spaces across NUMA nodes.
4035 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4036 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4037 }
4038 }
4039 return JNI_OK;
4040 }
4041
4042 int Arguments::PropertyList_count(SystemProperty* pl) {
4043 int count = 0;
4044 while(pl != NULL) {
4045 count++;
4046 pl = pl->next();
4047 }
4048 return count;
4049 }
4050
4051 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4052 assert(key != NULL, "just checking");
4053 SystemProperty* prop;
4054 for (prop = pl; prop != NULL; prop = prop->next()) {
4055 if (strcmp(key, prop->key()) == 0) return prop->value();
4056 }
4057 return NULL;
4058 }
4059
4060 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4061 int count = 0;
4062 const char* ret_val = NULL;
4063
4064 while(pl != NULL) {
4065 if(count >= index) {
4066 ret_val = pl->key();
4067 break;
4068 }
4069 count++;
4070 pl = pl->next();
4071 }
4072
4073 return ret_val;
4074 }
4075
4076 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4077 int count = 0;
4078 char* ret_val = NULL;
4079
4080 while(pl != NULL) {
4081 if(count >= index) {
4082 ret_val = pl->value();
4083 break;
4084 }
4085 count++;
4086 pl = pl->next();
4087 }
4088
4089 return ret_val;
4090 }
4091
4092 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4093 SystemProperty* p = *plist;
4094 if (p == NULL) {
4095 *plist = new_p;
4096 } else {
4097 while (p->next() != NULL) {
4098 p = p->next();
4099 }
4100 p->set_next(new_p);
4101 }
4102 }
4103
4104 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4105 if (plist == NULL)
4106 return;
4107
4108 SystemProperty* new_p = new SystemProperty(k, v, true);
4109 PropertyList_add(plist, new_p);
4110 }
4111
4112 void Arguments::PropertyList_add(SystemProperty *element) {
4113 PropertyList_add(&_system_properties, element);
4114 }
4115
4116 // This add maintains unique property key in the list.
4117 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4118 if (plist == NULL)
4119 return;
4120
4121 // If property key exist then update with new value.
4122 SystemProperty* prop;
4123 for (prop = *plist; prop != NULL; prop = prop->next()) {
4124 if (strcmp(k, prop->key()) == 0) {
4125 if (append) {
4126 prop->append_value(v);
4127 } else {
4128 prop->set_value(v);
4129 }
4130 return;
4131 }
4132 }
4133
4134 PropertyList_add(plist, k, v);
4135 }
4136
4137 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4138 // Returns true if all of the source pointed by src has been copied over to
4139 // the destination buffer pointed by buf. Otherwise, returns false.
4140 // Notes:
4141 // 1. If the length (buflen) of the destination buffer excluding the
4142 // NULL terminator character is not long enough for holding the expanded
4143 // pid characters, it also returns false instead of returning the partially
4144 // expanded one.
4145 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4146 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4147 char* buf, size_t buflen) {
4148 const char* p = src;
4149 char* b = buf;
4150 const char* src_end = &src[srclen];
4151 char* buf_end = &buf[buflen - 1];
4152
4153 while (p < src_end && b < buf_end) {
4154 if (*p == '%') {
4155 switch (*(++p)) {
4156 case '%': // "%%" ==> "%"
4157 *b++ = *p++;
4158 break;
4159 case 'p': { // "%p" ==> current process id
4160 // buf_end points to the character before the last character so
4161 // that we could write '\0' to the end of the buffer.
4162 size_t buf_sz = buf_end - b + 1;
4163 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4164
4165 // if jio_snprintf fails or the buffer is not long enough to hold
4166 // the expanded pid, returns false.
4167 if (ret < 0 || ret >= (int)buf_sz) {
4168 return false;
4169 } else {
4170 b += ret;
4171 assert(*b == '\0', "fail in copy_expand_pid");
4172 if (p == src_end && b == buf_end + 1) {
4173 // reach the end of the buffer.
4174 return true;
4175 }
4176 }
4177 p++;
4178 break;
4179 }
4180 default :
4181 *b++ = '%';
4182 }
4183 } else {
4184 *b++ = *p++;
4185 }
4186 }
4187 *b = '\0';
4188 return (p == src_end); // return false if not all of the source was copied
4189 }