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