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 "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/arguments_ext.hpp"
41 #include "runtime/globals_extension.hpp"
42 #include "runtime/java.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/vm_version.hpp"
45 #include "services/management.hpp"
46 #include "services/memTracker.hpp"
47 #include "utilities/defaultStream.hpp"
48 #include "utilities/macros.hpp"
49 #include "utilities/stringUtils.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc/cms/compactibleFreeListSpace.hpp"
52 #include "gc/g1/g1CollectedHeap.inline.hpp"
53 #include "gc/parallel/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 #define N_MAX_OPTIONS 64
60 #define OPTION_BUFFER_SIZE 1024
61
62 #define UNSUPPORTED_GC_OPTION(gc) \
63 do { \
64 if (gc) { \
65 if (FLAG_IS_CMDLINE(gc)) { \
66 warning(#gc " is not supported in this VM. Using Serial GC."); \
67 } \
68 FLAG_SET_DEFAULT(gc, false); \
69 } \
70 } while(0)
71
72 char** Arguments::_jvm_flags_array = NULL;
73 int Arguments::_num_jvm_flags = 0;
74 char** Arguments::_jvm_args_array = NULL;
75 int Arguments::_num_jvm_args = 0;
76 char* Arguments::_java_command = NULL;
77 SystemProperty* Arguments::_system_properties = NULL;
78 const char* Arguments::_gc_log_filename = NULL;
79 bool Arguments::_has_profile = false;
80 size_t Arguments::_conservative_max_heap_alignment = 0;
81 size_t Arguments::_min_heap_size = 0;
82 uintx Arguments::_min_heap_free_ratio = 0;
83 uintx Arguments::_max_heap_free_ratio = 0;
84 Arguments::Mode Arguments::_mode = _mixed;
85 bool Arguments::_java_compiler = false;
86 bool Arguments::_xdebug_mode = false;
87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
89 int Arguments::_sun_java_launcher_pid = -1;
90 bool Arguments::_sun_java_launcher_is_altjvm = false;
91
92 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
95 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
96 bool Arguments::_ClipInlining = ClipInlining;
97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
99
100 char* Arguments::SharedArchivePath = NULL;
101
102 AgentLibraryList Arguments::_libraryList;
103 AgentLibraryList Arguments::_agentList;
104
105 abort_hook_t Arguments::_abort_hook = NULL;
106 exit_hook_t Arguments::_exit_hook = NULL;
107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
108
109
110 SystemProperty *Arguments::_sun_boot_library_path = NULL;
111 SystemProperty *Arguments::_java_library_path = NULL;
112 SystemProperty *Arguments::_java_home = NULL;
113 SystemProperty *Arguments::_java_class_path = NULL;
114 SystemProperty *Arguments::_sun_boot_class_path = NULL;
115
116 char* Arguments::_ext_dirs = NULL;
117 // change the 0 on next line to 1 to enable argument tracing
118 #if 0
119 #define JVM_ARGS_ETRACE(x) x
120 #else
121 #define JVM_ARGS_ETRACE(x)
122 #endif
123
124 // Dump VM Option with a tag
125 void DumpOption(const JavaVMOption *option_p,
126 const int index, const char *tag) {
127 if (PrintVMOptions && Verbose) {
128 if (index >= 0) {
129 jio_fprintf(defaultStream::output_stream(),
130 "%s:[%d]='%s'\n", tag, index, option_p->optionString);
131 }
132 }
133 }
134
135 // Dump VM Option with a tag
136 void DumpVMOption(const JavaVMInitArgs* args_p,
137 const int index, const char *tag) {
138 if (PrintVMOptions && Verbose) {
139 if (args_p->options != NULL) {
140 if ((index >= 0) && (index < args_p->nOptions)) {
141 JavaVMOption *option_p = args_p->options + index;
142 jio_fprintf(defaultStream::output_stream(),
143 "%s:[%d]='%s'\n", tag, index, option_p->optionString);
144 }
145 }
146 }
147 }
148
149 // Dump VM Options with a tag
150 void DumpVMOptions(const JavaVMInitArgs* args_p, const char *tag) {
151 if (PrintVMOptions && Verbose) {
152 if (args_p->options != NULL) {
153 for (int index = 0; index < args_p->nOptions; index++) {
154 JavaVMOption *option_p = args_p->options + index;
155 jio_fprintf(defaultStream::output_stream(),
156 "%s:[%d]='%s'\n", tag, index, option_p->optionString);
157 }
158 }
159 }
160 }
161
162 // Free memory associated with an options list
163 void FreeVMOptions(JavaVMInitArgs **args_pp, const JavaVMInitArgs *args_base_p) {
164 assert(args_pp != NULL, "args_pp must not be NULL");
165 assert(*args_pp != NULL, "*args_pp must not be NULL");
166 if (args_base_p == (*args_pp)) {
167 // Do not free memory we did not allocate
168 return;
169 }
170 assert((*args_pp)->options != NULL, "(*args_pp)->options must not be NULL");
171 for (int index = 0; index < (*args_pp)->nOptions; index++) {
172 JavaVMOption *option_p = (*args_pp)->options + index;
173 if (option_p->optionString != NULL) {
174 os::free(option_p->optionString);
175 option_p->optionString = NULL;
176 }
177 }
178 os::free((void *)(*args_pp)->options);
179 (*args_pp)->options = NULL;
180 os::free((void *)(*args_pp));
181 (*args_pp) = NULL;
182 }
183
184 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
185 // part of the option string.
186 static bool match_option(const JavaVMOption *option, const char* name,
187 const char** tail) {
188 int len = (int)strlen(name);
189 if (strncmp(option->optionString, name, len) == 0) {
190 *tail = option->optionString + len;
191 return true;
192 } else {
193 return false;
194 }
195 }
196
197 // Check if 'option' matches 'name'. No "tail" is allowed.
198 static bool match_option(const JavaVMOption *option, const char* name) {
199 const char* tail = NULL;
200 bool result = match_option(option, name, &tail);
201 if (tail != NULL && *tail == '\0') {
202 return result;
203 } else {
204 return false;
205 }
206 }
207
208 // Return true if any of the strings in null-terminated array 'names' matches.
209 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
210 // the option must match exactly.
211 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
212 bool tail_allowed) {
213 for (/* empty */; *names != NULL; ++names) {
214 if (match_option(option, *names, tail)) {
215 if (**tail == '\0' || tail_allowed && **tail == ':') {
216 return true;
217 }
218 }
219 }
220 return false;
221 }
222
223 static void logOption(const char* opt) {
224 if (PrintVMOptions) {
225 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
226 }
227 }
228
229 // Process java launcher properties.
230 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
231 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
232 // sun.java.launcher.pid is defined.
233 // Must do this before setting up other system properties,
234 // as some of them may depend on launcher type.
235 for (int index = 0; index < args->nOptions; index++) {
236 const JavaVMOption* option = args->options + index;
237 const char* tail;
238
239 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
240 process_java_launcher_argument(tail, option->extraInfo);
241 continue;
242 }
243 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
244 if (strcmp(tail, "true") == 0) {
245 _sun_java_launcher_is_altjvm = true;
246 }
247 continue;
248 }
249 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
250 _sun_java_launcher_pid = atoi(tail);
251 continue;
252 }
253 }
254 }
255
256 // Initialize system properties key and value.
257 void Arguments::init_system_properties() {
258
259 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
260 "Java Virtual Machine Specification", false));
261 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
262 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
263 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
264
265 // Following are JVMTI agent writable properties.
266 // Properties values are set to NULL and they are
267 // os specific they are initialized in os::init_system_properties_values().
268 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
269 _java_library_path = new SystemProperty("java.library.path", NULL, true);
270 _java_home = new SystemProperty("java.home", NULL, true);
271 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
272
273 _java_class_path = new SystemProperty("java.class.path", "", true);
274
275 // Add to System Property list.
276 PropertyList_add(&_system_properties, _sun_boot_library_path);
277 PropertyList_add(&_system_properties, _java_library_path);
278 PropertyList_add(&_system_properties, _java_home);
279 PropertyList_add(&_system_properties, _java_class_path);
280 PropertyList_add(&_system_properties, _sun_boot_class_path);
281
282 // Set OS specific system properties values
283 os::init_system_properties_values();
284 }
285
286
287 // Update/Initialize System properties after JDK version number is known
288 void Arguments::init_version_specific_system_properties() {
289 enum { bufsz = 16 };
290 char buffer[bufsz];
291 const char* spec_vendor = "Sun Microsystems Inc.";
292 uint32_t spec_version = 0;
293
294 spec_vendor = "Oracle Corporation";
295 spec_version = JDK_Version::current().major_version();
296 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
297
298 PropertyList_add(&_system_properties,
299 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
300 PropertyList_add(&_system_properties,
301 new SystemProperty("java.vm.specification.version", buffer, false));
302 PropertyList_add(&_system_properties,
303 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
304 }
305
306 /**
307 * Provide a slightly more user-friendly way of eliminating -XX flags.
308 * When a flag is eliminated, it can be added to this list in order to
309 * continue accepting this flag on the command-line, while issuing a warning
310 * and ignoring the value. Once the JDK version reaches the 'accept_until'
311 * limit, we flatly refuse to admit the existence of the flag. This allows
312 * a flag to die correctly over JDK releases using HSX.
313 * But now that HSX is no longer supported only options with a future
314 * accept_until value need to be listed, and the list can be pruned
315 * on each major release.
316 */
317 typedef struct {
318 const char* name;
319 JDK_Version obsoleted_in; // when the flag went away
320 JDK_Version accept_until; // which version to start denying the existence
321 } ObsoleteFlag;
322
323 static ObsoleteFlag obsolete_jvm_flags[] = {
324 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
325 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
326 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
327 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
328 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
329 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
330 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
331 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
332 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
333 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
334 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
335 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
336 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
337 #ifndef ZERO
338 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
339 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
340 #endif // ZERO
341 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
342 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
343 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
344 { NULL, JDK_Version(0), JDK_Version(0) }
345 };
346
347 // Returns true if the flag is obsolete and fits into the range specified
348 // for being ignored. In the case that the flag is ignored, the 'version'
349 // value is filled in with the version number when the flag became
350 // obsolete so that that value can be displayed to the user.
351 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
352 int i = 0;
353 assert(version != NULL, "Must provide a version buffer");
354 while (obsolete_jvm_flags[i].name != NULL) {
355 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
356 // <flag>=xxx form
357 // [-|+]<flag> form
358 size_t len = strlen(flag_status.name);
359 if ((strncmp(flag_status.name, s, len) == 0) &&
360 (strlen(s) == len)){
361 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
362 *version = flag_status.obsoleted_in;
363 return true;
364 }
365 }
366 i++;
367 }
368 return false;
369 }
370
371 // Constructs the system class path (aka boot class path) from the following
372 // components, in order:
373 //
374 // prefix // from -Xbootclasspath/p:...
375 // base // from os::get_system_properties() or -Xbootclasspath=
376 // suffix // from -Xbootclasspath/a:...
377 //
378 // This could be AllStatic, but it isn't needed after argument processing is
379 // complete.
380 class SysClassPath: public StackObj {
381 public:
382 SysClassPath(const char* base);
383 ~SysClassPath();
384
385 inline void set_base(const char* base);
386 inline void add_prefix(const char* prefix);
387 inline void add_suffix_to_prefix(const char* suffix);
388 inline void add_suffix(const char* suffix);
389 inline void reset_path(const char* base);
390
391 inline const char* get_base() const { return _items[_scp_base]; }
392 inline const char* get_prefix() const { return _items[_scp_prefix]; }
393 inline const char* get_suffix() const { return _items[_scp_suffix]; }
394
395 // Combine all the components into a single c-heap-allocated string; caller
396 // must free the string if/when no longer needed.
397 char* combined_path();
398
399 private:
400 // Utility routines.
401 static char* add_to_path(const char* path, const char* str, bool prepend);
402 static char* add_jars_to_path(char* path, const char* directory);
403
404 inline void reset_item_at(int index);
405
406 // Array indices for the items that make up the sysclasspath. All except the
407 // base are allocated in the C heap and freed by this class.
408 enum {
409 _scp_prefix, // from -Xbootclasspath/p:...
410 _scp_base, // the default sysclasspath
411 _scp_suffix, // from -Xbootclasspath/a:...
412 _scp_nitems // the number of items, must be last.
413 };
414
415 const char* _items[_scp_nitems];
416 };
417
418 SysClassPath::SysClassPath(const char* base) {
419 memset(_items, 0, sizeof(_items));
420 _items[_scp_base] = base;
421 }
422
423 SysClassPath::~SysClassPath() {
424 // Free everything except the base.
425 for (int i = 0; i < _scp_nitems; ++i) {
426 if (i != _scp_base) reset_item_at(i);
427 }
428 }
429
430 inline void SysClassPath::set_base(const char* base) {
431 _items[_scp_base] = base;
432 }
433
434 inline void SysClassPath::add_prefix(const char* prefix) {
435 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
436 }
437
438 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
439 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
440 }
441
442 inline void SysClassPath::add_suffix(const char* suffix) {
443 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
444 }
445
446 inline void SysClassPath::reset_item_at(int index) {
447 assert(index < _scp_nitems && index != _scp_base, "just checking");
448 if (_items[index] != NULL) {
449 FREE_C_HEAP_ARRAY(char, _items[index]);
450 _items[index] = NULL;
451 }
452 }
453
454 inline void SysClassPath::reset_path(const char* base) {
455 // Clear the prefix and suffix.
456 reset_item_at(_scp_prefix);
457 reset_item_at(_scp_suffix);
458 set_base(base);
459 }
460
461 //------------------------------------------------------------------------------
462
463
464 // Combine the bootclasspath elements, some of which may be null, into a single
465 // c-heap-allocated string.
466 char* SysClassPath::combined_path() {
467 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
468
469 size_t lengths[_scp_nitems];
470 size_t total_len = 0;
471
472 const char separator = *os::path_separator();
473
474 // Get the lengths.
475 int i;
476 for (i = 0; i < _scp_nitems; ++i) {
477 if (_items[i] != NULL) {
478 lengths[i] = strlen(_items[i]);
479 // Include space for the separator char (or a NULL for the last item).
480 total_len += lengths[i] + 1;
481 }
482 }
483 assert(total_len > 0, "empty sysclasspath not allowed");
484
485 // Copy the _items to a single string.
486 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
487 char* cp_tmp = cp;
488 for (i = 0; i < _scp_nitems; ++i) {
489 if (_items[i] != NULL) {
490 memcpy(cp_tmp, _items[i], lengths[i]);
491 cp_tmp += lengths[i];
492 *cp_tmp++ = separator;
493 }
494 }
495 *--cp_tmp = '\0'; // Replace the extra separator.
496 return cp;
497 }
498
499 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
500 char*
501 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
502 char *cp;
503
504 assert(str != NULL, "just checking");
505 if (path == NULL) {
506 size_t len = strlen(str) + 1;
507 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
508 memcpy(cp, str, len); // copy the trailing null
509 } else {
510 const char separator = *os::path_separator();
511 size_t old_len = strlen(path);
512 size_t str_len = strlen(str);
513 size_t len = old_len + str_len + 2;
514
515 if (prepend) {
516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
517 char* cp_tmp = cp;
518 memcpy(cp_tmp, str, str_len);
519 cp_tmp += str_len;
520 *cp_tmp = separator;
521 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
522 FREE_C_HEAP_ARRAY(char, path);
523 } else {
524 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
525 char* cp_tmp = cp + old_len;
526 *cp_tmp = separator;
527 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
528 }
529 }
530 return cp;
531 }
532
533 // Scan the directory and append any jar or zip files found to path.
534 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
535 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
536 DIR* dir = os::opendir(directory);
537 if (dir == NULL) return path;
538
539 char dir_sep[2] = { '\0', '\0' };
540 size_t directory_len = strlen(directory);
541 const char fileSep = *os::file_separator();
542 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
543
544 /* Scan the directory for jars/zips, appending them to path. */
545 struct dirent *entry;
546 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
547 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
548 const char* name = entry->d_name;
549 const char* ext = name + strlen(name) - 4;
550 bool isJarOrZip = ext > name &&
551 (os::file_name_strcmp(ext, ".jar") == 0 ||
552 os::file_name_strcmp(ext, ".zip") == 0);
553 if (isJarOrZip) {
554 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
555 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
556 path = add_to_path(path, jarpath, false);
557 FREE_C_HEAP_ARRAY(char, jarpath);
558 }
559 }
560 FREE_C_HEAP_ARRAY(char, dbuf);
561 os::closedir(dir);
562 return path;
563 }
564
565 // Parses a memory size specification string.
566 static bool atomull(const char *s, julong* result) {
567 julong n = 0;
568 int args_read = 0;
569 bool is_hex = false;
570 // Skip leading 0[xX] for hexadecimal
571 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
572 s += 2;
573 is_hex = true;
574 args_read = sscanf(s, JULONG_FORMAT_X, &n);
575 } else {
576 args_read = sscanf(s, JULONG_FORMAT, &n);
577 }
578 if (args_read != 1) {
579 return false;
580 }
581 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
582 s++;
583 }
584 // 4705540: illegal if more characters are found after the first non-digit
585 if (strlen(s) > 1) {
586 return false;
587 }
588 switch (*s) {
589 case 'T': case 't':
590 *result = n * G * K;
591 // Check for overflow.
592 if (*result/((julong)G * K) != n) return false;
593 return true;
594 case 'G': case 'g':
595 *result = n * G;
596 if (*result/G != n) return false;
597 return true;
598 case 'M': case 'm':
599 *result = n * M;
600 if (*result/M != n) return false;
601 return true;
602 case 'K': case 'k':
603 *result = n * K;
604 if (*result/K != n) return false;
605 return true;
606 case '\0':
607 *result = n;
608 return true;
609 default:
610 return false;
611 }
612 }
613
614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
615 if (size < min_size) return arg_too_small;
616 // Check that size will fit in a size_t (only relevant on 32-bit)
617 if (size > max_uintx) return arg_too_big;
618 return arg_in_range;
619 }
620
621 // Describe an argument out of range error
622 void Arguments::describe_range_error(ArgsRange errcode) {
623 switch(errcode) {
624 case arg_too_big:
625 jio_fprintf(defaultStream::error_stream(),
626 "The specified size exceeds the maximum "
627 "representable size.\n");
628 break;
629 case arg_too_small:
630 case arg_unreadable:
631 case arg_in_range:
632 // do nothing for now
633 break;
634 default:
635 ShouldNotReachHere();
636 }
637 }
638
639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
640 return CommandLineFlags::boolAtPut(name, &value, origin);
641 }
642
643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
644 double v;
645 if (sscanf(value, "%lf", &v) != 1) {
646 return false;
647 }
648
649 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
650 return true;
651 }
652 return false;
653 }
654
655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
656 julong v;
657 int int_v;
658 intx intx_v;
659 bool is_neg = false;
660 // Check the sign first since atomull() parses only unsigned values.
661 if (*value == '-') {
662 if (!CommandLineFlags::intxAt(name, &intx_v) && !CommandLineFlags::intAt(name, &int_v)) {
663 return false;
664 }
665 value++;
666 is_neg = true;
667 }
668 if (!atomull(value, &v)) {
669 return false;
670 }
671 int_v = (int) v;
672 if (is_neg) {
673 int_v = -int_v;
674 }
675 if (CommandLineFlags::intAtPut(name, &int_v, origin)) {
676 return true;
677 }
678 uint uint_v = (uint) v;
679 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin)) {
680 return true;
681 }
682 intx_v = (intx) v;
683 if (is_neg) {
684 intx_v = -intx_v;
685 }
686 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
687 return true;
688 }
689 uintx uintx_v = (uintx) v;
690 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
691 return true;
692 }
693 uint64_t uint64_t_v = (uint64_t) v;
694 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
695 return true;
696 }
697 size_t size_t_v = (size_t) v;
698 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
699 return true;
700 }
701 return false;
702 }
703
704 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
705 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
706 // Contract: CommandLineFlags always returns a pointer that needs freeing.
707 FREE_C_HEAP_ARRAY(char, value);
708 return true;
709 }
710
711 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
712 const char* old_value = "";
713 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
714 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
715 size_t new_len = strlen(new_value);
716 const char* value;
717 char* free_this_too = NULL;
718 if (old_len == 0) {
719 value = new_value;
720 } else if (new_len == 0) {
721 value = old_value;
722 } else {
723 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
724 // each new setting adds another LINE to the switch:
725 sprintf(buf, "%s\n%s", old_value, new_value);
726 value = buf;
727 free_this_too = buf;
728 }
729 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
730 // CommandLineFlags always returns a pointer that needs freeing.
731 FREE_C_HEAP_ARRAY(char, value);
732 if (free_this_too != NULL) {
733 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
734 FREE_C_HEAP_ARRAY(char, free_this_too);
735 }
736 return true;
737 }
738
739 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
740
741 // range of acceptable characters spelled out for portability reasons
742 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
743 #define BUFLEN 255
744 char name[BUFLEN+1];
745 char dummy;
746
747 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
748 return set_bool_flag(name, false, origin);
749 }
750 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
751 return set_bool_flag(name, true, origin);
752 }
753
754 char punct;
755 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
756 const char* value = strchr(arg, '=') + 1;
757 Flag* flag = Flag::find_flag(name, strlen(name));
758 if (flag != NULL && flag->is_ccstr()) {
759 if (flag->ccstr_accumulates()) {
760 return append_to_string_flag(name, value, origin);
761 } else {
762 if (value[0] == '\0') {
763 value = NULL;
764 }
765 return set_string_flag(name, value, origin);
766 }
767 }
768 }
769
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
771 const char* value = strchr(arg, '=') + 1;
772 // -XX:Foo:=xxx will reset the string flag to the given value.
773 if (value[0] == '\0') {
774 value = NULL;
775 }
776 return set_string_flag(name, value, origin);
777 }
778
779 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
780 #define SIGNED_NUMBER_RANGE "[-0123456789]"
781 #define NUMBER_RANGE "[0123456789]"
782 char value[BUFLEN + 1];
783 char value2[BUFLEN + 1];
784 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
785 // Looks like a floating-point number -- try again with more lenient format string
786 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
787 return set_fp_numeric_flag(name, value, origin);
788 }
789 }
790
791 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
792 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
793 return set_numeric_flag(name, value, origin);
794 }
795
796 return false;
797 }
798
799 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
800 assert(bldarray != NULL, "illegal argument");
801
802 if (arg == NULL) {
803 return;
804 }
805
806 int new_count = *count + 1;
807
808 // expand the array and add arg to the last element
809 if (*bldarray == NULL) {
810 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
811 } else {
812 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
813 }
814 (*bldarray)[*count] = os::strdup_check_oom(arg);
815 *count = new_count;
816 }
817
818 void Arguments::build_jvm_args(const char* arg) {
819 add_string(&_jvm_args_array, &_num_jvm_args, arg);
820 }
821
822 void Arguments::build_jvm_flags(const char* arg) {
823 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
824 }
825
826 // utility function to return a string that concatenates all
827 // strings in a given char** array
828 const char* Arguments::build_resource_string(char** args, int count) {
829 if (args == NULL || count == 0) {
830 return NULL;
831 }
832 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
833 for (int i = 1; i < count; i++) {
834 length += strlen(args[i]) + 1; // add 1 for a space
835 }
836 char* s = NEW_RESOURCE_ARRAY(char, length);
837 strcpy(s, args[0]);
838 for (int j = 1; j < count; j++) {
839 strcat(s, " ");
840 strcat(s, args[j]);
841 }
842 return (const char*) s;
843 }
844
845 void Arguments::print_on(outputStream* st) {
846 st->print_cr("VM Arguments:");
847 if (num_jvm_flags() > 0) {
848 st->print("jvm_flags: "); print_jvm_flags_on(st);
849 }
850 if (num_jvm_args() > 0) {
851 st->print("jvm_args: "); print_jvm_args_on(st);
852 }
853 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
854 if (_java_class_path != NULL) {
855 char* path = _java_class_path->value();
856 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
857 }
858 st->print_cr("Launcher Type: %s", _sun_java_launcher);
859 }
860
861 void Arguments::print_jvm_flags_on(outputStream* st) {
862 if (_num_jvm_flags > 0) {
863 for (int i=0; i < _num_jvm_flags; i++) {
864 st->print("%s ", _jvm_flags_array[i]);
865 }
866 st->cr();
867 }
868 }
869
870 void Arguments::print_jvm_args_on(outputStream* st) {
871 if (_num_jvm_args > 0) {
872 for (int i=0; i < _num_jvm_args; i++) {
873 st->print("%s ", _jvm_args_array[i]);
874 }
875 st->cr();
876 }
877 }
878
879 bool Arguments::process_argument(const char* arg,
880 jboolean ignore_unrecognized, Flag::Flags origin) {
881
882 JDK_Version since = JDK_Version();
883
884 if (parse_argument(arg, origin) || ignore_unrecognized) {
885 return true;
886 }
887
888 // Determine if the flag has '+', '-', or '=' characters.
889 bool has_plus_minus = (*arg == '+' || *arg == '-');
890 const char* const argname = has_plus_minus ? arg + 1 : arg;
891
892 size_t arg_len;
893 const char* equal_sign = strchr(argname, '=');
894 if (equal_sign == NULL) {
895 arg_len = strlen(argname);
896 } else {
897 arg_len = equal_sign - argname;
898 }
899
900 // Construct a string which consists only of the argument name without '+', '-', or '='.
901 char stripped_argname[256];
902 strncpy(stripped_argname, argname, arg_len);
903 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
904
905 if (is_newly_obsolete(stripped_argname, &since)) {
906 char version[256];
907 since.to_string(version, sizeof(version));
908 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
909 return true;
910 }
911
912 // For locked flags, report a custom error message if available.
913 // Otherwise, report the standard unrecognized VM option.
914 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
915 if (found_flag != NULL) {
916 char locked_message_buf[BUFLEN];
917 found_flag->get_locked_message(locked_message_buf, BUFLEN);
918 if (strlen(locked_message_buf) == 0) {
919 if (found_flag->is_bool() && !has_plus_minus) {
920 jio_fprintf(defaultStream::error_stream(),
921 "Missing +/- setting for VM option '%s'\n", argname);
922 } else if (!found_flag->is_bool() && has_plus_minus) {
923 jio_fprintf(defaultStream::error_stream(),
924 "Unexpected +/- setting in VM option '%s'\n", argname);
925 } else {
926 jio_fprintf(defaultStream::error_stream(),
927 "Improperly specified VM option '%s'\n", argname);
928 }
929 } else {
930 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
931 }
932 } else {
933 jio_fprintf(defaultStream::error_stream(),
934 "Unrecognized VM option '%s'\n", argname);
935 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
936 if (fuzzy_matched != NULL) {
937 jio_fprintf(defaultStream::error_stream(),
938 "Did you mean '%s%s%s'? ",
939 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
940 fuzzy_matched->_name,
941 (fuzzy_matched->is_bool()) ? "" : "=<value>");
942 }
943 }
944
945 // allow for commandline "commenting out" options like -XX:#+Verbose
946 return arg[0] == '#';
947 }
948
949 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
950 FILE* stream = fopen(file_name, "rb");
951 if (stream == NULL) {
952 if (should_exist) {
953 jio_fprintf(defaultStream::error_stream(),
954 "Could not open settings file %s\n", file_name);
955 return false;
956 } else {
957 return true;
958 }
959 }
960
961 char token[1024];
962 int pos = 0;
963
964 bool in_white_space = true;
965 bool in_comment = false;
966 bool in_quote = false;
967 char quote_c = 0;
968 bool result = true;
969
970 int c = getc(stream);
971 while(c != EOF && pos < (int)(sizeof(token)-1)) {
972 if (in_white_space) {
973 if (in_comment) {
974 if (c == '\n') in_comment = false;
975 } else {
976 if (c == '#') in_comment = true;
977 else if (!isspace(c)) {
978 in_white_space = false;
979 token[pos++] = c;
980 }
981 }
982 } else {
983 if (c == '\n' || (!in_quote && isspace(c))) {
984 // token ends at newline, or at unquoted whitespace
985 // this allows a way to include spaces in string-valued options
986 token[pos] = '\0';
987 logOption(token);
988 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
989 build_jvm_flags(token);
990 pos = 0;
991 in_white_space = true;
992 in_quote = false;
993 } else if (!in_quote && (c == '\'' || c == '"')) {
994 in_quote = true;
995 quote_c = c;
996 } else if (in_quote && (c == quote_c)) {
997 in_quote = false;
998 } else {
999 token[pos++] = c;
1000 }
1001 }
1002 c = getc(stream);
1003 }
1004 if (pos > 0) {
1005 token[pos] = '\0';
1006 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1007 build_jvm_flags(token);
1008 }
1009 fclose(stream);
1010 return result;
1011 }
1012
1013 //=============================================================================================================
1014 // Parsing of properties (-D)
1015
1016 const char* Arguments::get_property(const char* key) {
1017 return PropertyList_get_value(system_properties(), key);
1018 }
1019
1020 bool Arguments::add_property(const char* prop) {
1021 const char* eq = strchr(prop, '=');
1022 char* key;
1023 // ns must be static--its address may be stored in a SystemProperty object.
1024 const static char ns[1] = {0};
1025 char* value = (char *)ns;
1026
1027 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1028 key = AllocateHeap(key_len + 1, mtInternal);
1029 strncpy(key, prop, key_len);
1030 key[key_len] = '\0';
1031
1032 if (eq != NULL) {
1033 size_t value_len = strlen(prop) - key_len - 1;
1034 value = AllocateHeap(value_len + 1, mtInternal);
1035 strncpy(value, &prop[key_len + 1], value_len + 1);
1036 }
1037
1038 if (strcmp(key, "java.compiler") == 0) {
1039 process_java_compiler_argument(value);
1040 FreeHeap(key);
1041 if (eq != NULL) {
1042 FreeHeap(value);
1043 }
1044 return true;
1045 } else if (strcmp(key, "sun.java.command") == 0) {
1046 _java_command = value;
1047
1048 // Record value in Arguments, but let it get passed to Java.
1049 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1050 strcmp(key, "sun.java.launcher.pid") == 0) {
1051 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1052 // private and are processed in process_sun_java_launcher_properties();
1053 // the sun.java.launcher property is passed on to the java application
1054 FreeHeap(key);
1055 if (eq != NULL) {
1056 FreeHeap(value);
1057 }
1058 return true;
1059 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1060 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1061 // its value without going through the property list or making a Java call.
1062 _java_vendor_url_bug = value;
1063 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1064 PropertyList_unique_add(&_system_properties, key, value, true);
1065 return true;
1066 }
1067 // Create new property and add at the end of the list
1068 PropertyList_unique_add(&_system_properties, key, value);
1069 return true;
1070 }
1071
1072 //===========================================================================================================
1073 // Setting int/mixed/comp mode flags
1074
1075 void Arguments::set_mode_flags(Mode mode) {
1076 // Set up default values for all flags.
1077 // If you add a flag to any of the branches below,
1078 // add a default value for it here.
1079 set_java_compiler(false);
1080 _mode = mode;
1081
1082 // Ensure Agent_OnLoad has the correct initial values.
1083 // This may not be the final mode; mode may change later in onload phase.
1084 PropertyList_unique_add(&_system_properties, "java.vm.info",
1085 (char*)VM_Version::vm_info_string(), false);
1086
1087 UseInterpreter = true;
1088 UseCompiler = true;
1089 UseLoopCounter = true;
1090
1091 // Default values may be platform/compiler dependent -
1092 // use the saved values
1093 ClipInlining = Arguments::_ClipInlining;
1094 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1095 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1096 BackgroundCompilation = Arguments::_BackgroundCompilation;
1097 if (TieredCompilation) {
1098 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1099 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1100 }
1101 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1102 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1103 }
1104 }
1105
1106 // Change from defaults based on mode
1107 switch (mode) {
1108 default:
1109 ShouldNotReachHere();
1110 break;
1111 case _int:
1112 UseCompiler = false;
1113 UseLoopCounter = false;
1114 AlwaysCompileLoopMethods = false;
1115 UseOnStackReplacement = false;
1116 break;
1117 case _mixed:
1118 // same as default
1119 break;
1120 case _comp:
1121 UseInterpreter = false;
1122 BackgroundCompilation = false;
1123 ClipInlining = false;
1124 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1125 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1126 // compile a level 4 (C2) and then continue executing it.
1127 if (TieredCompilation) {
1128 Tier3InvokeNotifyFreqLog = 0;
1129 Tier4InvocationThreshold = 0;
1130 }
1131 break;
1132 }
1133 }
1134
1135 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1136 // Conflict: required to use shared spaces (-Xshare:on), but
1137 // incompatible command line options were chosen.
1138
1139 static void no_shared_spaces(const char* message) {
1140 if (RequireSharedSpaces) {
1141 jio_fprintf(defaultStream::error_stream(),
1142 "Class data sharing is inconsistent with other specified options.\n");
1143 vm_exit_during_initialization("Unable to use shared archive.", message);
1144 } else {
1145 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1146 }
1147 }
1148 #endif
1149
1150 // Returns threshold scaled with the value of scale.
1151 // If scale < 0.0, threshold is returned without scaling.
1152 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1153 if (scale == 1.0 || scale < 0.0) {
1154 return threshold;
1155 } else {
1156 return (intx)(threshold * scale);
1157 }
1158 }
1159
1160 // Returns freq_log scaled with the value of scale.
1161 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1162 // If scale < 0.0, freq_log is returned without scaling.
1163 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1164 // Check if scaling is necessary or if negative value was specified.
1165 if (scale == 1.0 || scale < 0.0) {
1166 return freq_log;
1167 }
1168 // Check values to avoid calculating log2 of 0.
1169 if (scale == 0.0 || freq_log == 0) {
1170 return 0;
1171 }
1172 // Determine the maximum notification frequency value currently supported.
1173 // The largest mask value that the interpreter/C1 can handle is
1174 // of length InvocationCounter::number_of_count_bits. Mask values are always
1175 // one bit shorter then the value of the notification frequency. Set
1176 // max_freq_bits accordingly.
1177 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1178 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1179 if (scaled_freq == 0) {
1180 // Return 0 right away to avoid calculating log2 of 0.
1181 return 0;
1182 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1183 return max_freq_bits;
1184 } else {
1185 return log2_intptr(scaled_freq);
1186 }
1187 }
1188
1189 void Arguments::set_tiered_flags() {
1190 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1191 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1192 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1193 }
1194 if (CompilationPolicyChoice < 2) {
1195 vm_exit_during_initialization(
1196 "Incompatible compilation policy selected", NULL);
1197 }
1198 // Increase the code cache size - tiered compiles a lot more.
1199 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1200 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1201 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1202 }
1203 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1204 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1205 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1206
1207 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1208 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1209 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1210 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1211 }
1212 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1213 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1214 }
1215 // Check consistency of code heap sizes
1216 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1217 jio_fprintf(defaultStream::error_stream(),
1218 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1219 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1220 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1221 vm_exit(1);
1222 }
1223 }
1224 }
1225 if (!UseInterpreter) { // -Xcomp
1226 Tier3InvokeNotifyFreqLog = 0;
1227 Tier4InvocationThreshold = 0;
1228 }
1229
1230 if (CompileThresholdScaling < 0) {
1231 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1232 }
1233
1234 // Scale tiered compilation thresholds.
1235 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1236 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1237 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1238 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1239
1240 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1241 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1242 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1243 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1244
1245 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1246 // once these thresholds become supported.
1247
1248 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1249 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1250
1251 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1252 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1253
1254 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1255
1256 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1257 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1258 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1259 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1260 }
1261 }
1262
1263 /**
1264 * Returns the minimum number of compiler threads needed to run the JVM. The following
1265 * configurations are possible.
1266 *
1267 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1268 * compiler threads is 0.
1269 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1270 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1271 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1272 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1273 * C1 can be used, so the minimum number of compiler threads is 1.
1274 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1275 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1276 * the minimum number of compiler threads is 2.
1277 */
1278 int Arguments::get_min_number_of_compiler_threads() {
1279 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1280 return 0; // case 1
1281 #else
1282 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1283 return 1; // case 2 or case 3
1284 }
1285 return 2; // case 4 (tiered)
1286 #endif
1287 }
1288
1289 #if INCLUDE_ALL_GCS
1290 static void disable_adaptive_size_policy(const char* collector_name) {
1291 if (UseAdaptiveSizePolicy) {
1292 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1293 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1294 collector_name);
1295 }
1296 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1297 }
1298 }
1299
1300 void Arguments::set_parnew_gc_flags() {
1301 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1302 "control point invariant");
1303 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1304 assert(UseParNewGC, "ParNew should always be used with CMS");
1305
1306 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1307 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1308 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1309 } else if (ParallelGCThreads == 0) {
1310 jio_fprintf(defaultStream::error_stream(),
1311 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1312 vm_exit(1);
1313 }
1314
1315 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1316 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1317 // we set them to 1024 and 1024.
1318 // See CR 6362902.
1319 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1320 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1321 }
1322 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1323 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1324 }
1325
1326 // When using compressed oops, we use local overflow stacks,
1327 // rather than using a global overflow list chained through
1328 // the klass word of the object's pre-image.
1329 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1330 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1331 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1332 }
1333 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1334 }
1335 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1336 }
1337
1338 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1339 // sparc/solaris for certain applications, but would gain from
1340 // further optimization and tuning efforts, and would almost
1341 // certainly gain from analysis of platform and environment.
1342 void Arguments::set_cms_and_parnew_gc_flags() {
1343 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1344 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1345 assert(UseParNewGC, "ParNew should always be used with CMS");
1346
1347 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1348 disable_adaptive_size_policy("UseConcMarkSweepGC");
1349
1350 set_parnew_gc_flags();
1351
1352 size_t max_heap = align_size_down(MaxHeapSize,
1353 CardTableRS::ct_max_alignment_constraint());
1354
1355 // Now make adjustments for CMS
1356 intx tenuring_default = (intx)6;
1357 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1358
1359 // Preferred young gen size for "short" pauses:
1360 // upper bound depends on # of threads and NewRatio.
1361 const size_t preferred_max_new_size_unaligned =
1362 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1363 size_t preferred_max_new_size =
1364 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1365
1366 // Unless explicitly requested otherwise, size young gen
1367 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1368
1369 // If either MaxNewSize or NewRatio is set on the command line,
1370 // assume the user is trying to set the size of the young gen.
1371 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1372
1373 // Set MaxNewSize to our calculated preferred_max_new_size unless
1374 // NewSize was set on the command line and it is larger than
1375 // preferred_max_new_size.
1376 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1377 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1378 } else {
1379 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1380 }
1381 if (PrintGCDetails && Verbose) {
1382 // Too early to use gclog_or_tty
1383 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1384 }
1385
1386 // Code along this path potentially sets NewSize and OldSize
1387 if (PrintGCDetails && Verbose) {
1388 // Too early to use gclog_or_tty
1389 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1390 " initial_heap_size: " SIZE_FORMAT
1391 " max_heap: " SIZE_FORMAT,
1392 min_heap_size(), InitialHeapSize, max_heap);
1393 }
1394 size_t min_new = preferred_max_new_size;
1395 if (FLAG_IS_CMDLINE(NewSize)) {
1396 min_new = NewSize;
1397 }
1398 if (max_heap > min_new && min_heap_size() > min_new) {
1399 // Unless explicitly requested otherwise, make young gen
1400 // at least min_new, and at most preferred_max_new_size.
1401 if (FLAG_IS_DEFAULT(NewSize)) {
1402 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1403 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1404 if (PrintGCDetails && Verbose) {
1405 // Too early to use gclog_or_tty
1406 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1407 }
1408 }
1409 // Unless explicitly requested otherwise, size old gen
1410 // so it's NewRatio x of NewSize.
1411 if (FLAG_IS_DEFAULT(OldSize)) {
1412 if (max_heap > NewSize) {
1413 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1414 if (PrintGCDetails && Verbose) {
1415 // Too early to use gclog_or_tty
1416 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1417 }
1418 }
1419 }
1420 }
1421 }
1422 // Unless explicitly requested otherwise, definitely
1423 // promote all objects surviving "tenuring_default" scavenges.
1424 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1425 FLAG_IS_DEFAULT(SurvivorRatio)) {
1426 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1427 }
1428 // If we decided above (or user explicitly requested)
1429 // `promote all' (via MaxTenuringThreshold := 0),
1430 // prefer minuscule survivor spaces so as not to waste
1431 // space for (non-existent) survivors
1432 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1433 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1434 }
1435
1436 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1437 // but rather the number of free blocks of a given size that are used when
1438 // replenishing the local per-worker free list caches.
1439 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1440 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1441 // OldPLAB sizing manually turned off: Use a larger default setting,
1442 // unless it was manually specified. This is because a too-low value
1443 // will slow down scavenges.
1444 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1445 } else {
1446 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1447 }
1448 }
1449
1450 // If either of the static initialization defaults have changed, note this
1451 // modification.
1452 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1453 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1454 }
1455
1456 if (!ClassUnloading) {
1457 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1458 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1459 }
1460
1461 if (PrintGCDetails && Verbose) {
1462 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1463 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1464 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1465 }
1466 }
1467 #endif // INCLUDE_ALL_GCS
1468
1469 void set_object_alignment() {
1470 // Object alignment.
1471 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1472 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1473 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1474 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1475 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1476 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1477
1478 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1479 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1480
1481 // Oop encoding heap max
1482 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1483
1484 #if INCLUDE_ALL_GCS
1485 // Set CMS global values
1486 CompactibleFreeListSpace::set_cms_values();
1487 #endif // INCLUDE_ALL_GCS
1488 }
1489
1490 bool verify_object_alignment() {
1491 // Object alignment.
1492 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1493 jio_fprintf(defaultStream::error_stream(),
1494 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1495 (int)ObjectAlignmentInBytes);
1496 return false;
1497 }
1498 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1499 jio_fprintf(defaultStream::error_stream(),
1500 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1501 (int)ObjectAlignmentInBytes, BytesPerLong);
1502 return false;
1503 }
1504 // It does not make sense to have big object alignment
1505 // since a space lost due to alignment will be greater
1506 // then a saved space from compressed oops.
1507 if ((int)ObjectAlignmentInBytes > 256) {
1508 jio_fprintf(defaultStream::error_stream(),
1509 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1510 (int)ObjectAlignmentInBytes);
1511 return false;
1512 }
1513 // In case page size is very small.
1514 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1515 jio_fprintf(defaultStream::error_stream(),
1516 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1517 (int)ObjectAlignmentInBytes, os::vm_page_size());
1518 return false;
1519 }
1520 if(SurvivorAlignmentInBytes == 0) {
1521 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1522 } else {
1523 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1524 jio_fprintf(defaultStream::error_stream(),
1525 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1526 (int)SurvivorAlignmentInBytes);
1527 return false;
1528 }
1529 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1530 jio_fprintf(defaultStream::error_stream(),
1531 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1532 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1533 return false;
1534 }
1535 }
1536 return true;
1537 }
1538
1539 size_t Arguments::max_heap_for_compressed_oops() {
1540 // Avoid sign flip.
1541 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1542 // We need to fit both the NULL page and the heap into the memory budget, while
1543 // keeping alignment constraints of the heap. To guarantee the latter, as the
1544 // NULL page is located before the heap, we pad the NULL page to the conservative
1545 // maximum alignment that the GC may ever impose upon the heap.
1546 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1547 _conservative_max_heap_alignment);
1548
1549 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1550 NOT_LP64(ShouldNotReachHere(); return 0);
1551 }
1552
1553 bool Arguments::should_auto_select_low_pause_collector() {
1554 if (UseAutoGCSelectPolicy &&
1555 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1556 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1557 if (PrintGCDetails) {
1558 // Cannot use gclog_or_tty yet.
1559 tty->print_cr("Automatic selection of the low pause collector"
1560 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1561 }
1562 return true;
1563 }
1564 return false;
1565 }
1566
1567 void Arguments::set_use_compressed_oops() {
1568 #ifndef ZERO
1569 #ifdef _LP64
1570 // MaxHeapSize is not set up properly at this point, but
1571 // the only value that can override MaxHeapSize if we are
1572 // to use UseCompressedOops is InitialHeapSize.
1573 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1574
1575 if (max_heap_size <= max_heap_for_compressed_oops()) {
1576 #if !defined(COMPILER1) || defined(TIERED)
1577 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1578 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1579 }
1580 #endif
1581 } else {
1582 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1583 warning("Max heap size too large for Compressed Oops");
1584 FLAG_SET_DEFAULT(UseCompressedOops, false);
1585 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1586 }
1587 }
1588 #endif // _LP64
1589 #endif // ZERO
1590 }
1591
1592
1593 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1594 // set_use_compressed_oops().
1595 void Arguments::set_use_compressed_klass_ptrs() {
1596 #ifndef ZERO
1597 #ifdef _LP64
1598 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1599 if (!UseCompressedOops) {
1600 if (UseCompressedClassPointers) {
1601 warning("UseCompressedClassPointers requires UseCompressedOops");
1602 }
1603 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1604 } else {
1605 // Turn on UseCompressedClassPointers too
1606 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1607 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1608 }
1609 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1610 if (UseCompressedClassPointers) {
1611 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1612 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1613 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1614 }
1615 }
1616 }
1617 #endif // _LP64
1618 #endif // !ZERO
1619 }
1620
1621 void Arguments::set_conservative_max_heap_alignment() {
1622 // The conservative maximum required alignment for the heap is the maximum of
1623 // the alignments imposed by several sources: any requirements from the heap
1624 // itself, the collector policy and the maximum page size we may run the VM
1625 // with.
1626 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1627 #if INCLUDE_ALL_GCS
1628 if (UseParallelGC) {
1629 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1630 } else if (UseG1GC) {
1631 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1632 }
1633 #endif // INCLUDE_ALL_GCS
1634 _conservative_max_heap_alignment = MAX4(heap_alignment,
1635 (size_t)os::vm_allocation_granularity(),
1636 os::max_page_size(),
1637 CollectorPolicy::compute_heap_alignment());
1638 }
1639
1640 void Arguments::select_gc_ergonomically() {
1641 if (os::is_server_class_machine()) {
1642 if (should_auto_select_low_pause_collector()) {
1643 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1644 } else {
1645 FLAG_SET_ERGO(bool, UseParallelGC, true);
1646 }
1647 } else {
1648 FLAG_SET_ERGO(bool, UseSerialGC, true);
1649 }
1650 }
1651
1652 void Arguments::select_gc() {
1653 if (!gc_selected()) {
1654 select_gc_ergonomically();
1655 guarantee(gc_selected(), "No GC selected");
1656 }
1657 }
1658
1659 void Arguments::set_ergonomics_flags() {
1660 select_gc();
1661
1662 #ifdef COMPILER2
1663 // Shared spaces work fine with other GCs but causes bytecode rewriting
1664 // to be disabled, which hurts interpreter performance and decreases
1665 // server performance. When -server is specified, keep the default off
1666 // unless it is asked for. Future work: either add bytecode rewriting
1667 // at link time, or rewrite bytecodes in non-shared methods.
1668 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1669 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1670 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1671 }
1672 #endif
1673
1674 set_conservative_max_heap_alignment();
1675
1676 #ifndef ZERO
1677 #ifdef _LP64
1678 set_use_compressed_oops();
1679
1680 // set_use_compressed_klass_ptrs() must be called after calling
1681 // set_use_compressed_oops().
1682 set_use_compressed_klass_ptrs();
1683
1684 // Also checks that certain machines are slower with compressed oops
1685 // in vm_version initialization code.
1686 #endif // _LP64
1687 #endif // !ZERO
1688 }
1689
1690 void Arguments::set_parallel_gc_flags() {
1691 assert(UseParallelGC || UseParallelOldGC, "Error");
1692 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1693 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1694 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1695 }
1696 FLAG_SET_DEFAULT(UseParallelGC, true);
1697
1698 // If no heap maximum was requested explicitly, use some reasonable fraction
1699 // of the physical memory, up to a maximum of 1GB.
1700 FLAG_SET_DEFAULT(ParallelGCThreads,
1701 Abstract_VM_Version::parallel_worker_threads());
1702 if (ParallelGCThreads == 0) {
1703 jio_fprintf(defaultStream::error_stream(),
1704 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1705 vm_exit(1);
1706 }
1707
1708 if (UseAdaptiveSizePolicy) {
1709 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1710 // unless the user actually sets these flags.
1711 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1712 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1713 _min_heap_free_ratio = MinHeapFreeRatio;
1714 }
1715 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1716 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1717 _max_heap_free_ratio = MaxHeapFreeRatio;
1718 }
1719 }
1720
1721 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1722 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1723 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1724 // See CR 6362902 for details.
1725 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1726 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1727 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1728 }
1729 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1730 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1731 }
1732 }
1733
1734 if (UseParallelOldGC) {
1735 // Par compact uses lower default values since they are treated as
1736 // minimums. These are different defaults because of the different
1737 // interpretation and are not ergonomically set.
1738 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1739 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1740 }
1741 }
1742 }
1743
1744 void Arguments::set_g1_gc_flags() {
1745 assert(UseG1GC, "Error");
1746 #ifdef COMPILER1
1747 FastTLABRefill = false;
1748 #endif
1749 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1750 if (ParallelGCThreads == 0) {
1751 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1752 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1753 }
1754
1755 #if INCLUDE_ALL_GCS
1756 if (G1ConcRefinementThreads == 0) {
1757 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1758 }
1759 #endif
1760
1761 // MarkStackSize will be set (if it hasn't been set by the user)
1762 // when concurrent marking is initialized.
1763 // Its value will be based upon the number of parallel marking threads.
1764 // But we do set the maximum mark stack size here.
1765 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1766 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1767 }
1768
1769 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1770 // In G1, we want the default GC overhead goal to be higher than
1771 // say in PS. So we set it here to 10%. Otherwise the heap might
1772 // be expanded more aggressively than we would like it to. In
1773 // fact, even 10% seems to not be high enough in some cases
1774 // (especially small GC stress tests that the main thing they do
1775 // is allocation). We might consider increase it further.
1776 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1777 }
1778
1779 if (PrintGCDetails && Verbose) {
1780 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1781 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1782 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1783 }
1784 }
1785
1786 #if !INCLUDE_ALL_GCS
1787 #ifdef ASSERT
1788 static bool verify_serial_gc_flags() {
1789 return (UseSerialGC &&
1790 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1791 UseParallelGC || UseParallelOldGC));
1792 }
1793 #endif // ASSERT
1794 #endif // INCLUDE_ALL_GCS
1795
1796 void Arguments::set_gc_specific_flags() {
1797 #if INCLUDE_ALL_GCS
1798 // Set per-collector flags
1799 if (UseParallelGC || UseParallelOldGC) {
1800 set_parallel_gc_flags();
1801 } else if (UseConcMarkSweepGC) {
1802 set_cms_and_parnew_gc_flags();
1803 } else if (UseG1GC) {
1804 set_g1_gc_flags();
1805 }
1806 check_deprecated_gc_flags();
1807 if (AssumeMP && !UseSerialGC) {
1808 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1809 warning("If the number of processors is expected to increase from one, then"
1810 " you should configure the number of parallel GC threads appropriately"
1811 " using -XX:ParallelGCThreads=N");
1812 }
1813 }
1814 if (MinHeapFreeRatio == 100) {
1815 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1816 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1817 }
1818 #else // INCLUDE_ALL_GCS
1819 assert(verify_serial_gc_flags(), "SerialGC unset");
1820 #endif // INCLUDE_ALL_GCS
1821 }
1822
1823 julong Arguments::limit_by_allocatable_memory(julong limit) {
1824 julong max_allocatable;
1825 julong result = limit;
1826 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1827 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1828 }
1829 return result;
1830 }
1831
1832 // Use static initialization to get the default before parsing
1833 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1834
1835 void Arguments::set_heap_size() {
1836 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1837 // Deprecated flag
1838 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1839 }
1840
1841 const julong phys_mem =
1842 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1843 : (julong)MaxRAM;
1844
1845 // If the maximum heap size has not been set with -Xmx,
1846 // then set it as fraction of the size of physical memory,
1847 // respecting the maximum and minimum sizes of the heap.
1848 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1849 julong reasonable_max = phys_mem / MaxRAMFraction;
1850
1851 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1852 // Small physical memory, so use a minimum fraction of it for the heap
1853 reasonable_max = phys_mem / MinRAMFraction;
1854 } else {
1855 // Not-small physical memory, so require a heap at least
1856 // as large as MaxHeapSize
1857 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1858 }
1859 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1860 // Limit the heap size to ErgoHeapSizeLimit
1861 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1862 }
1863 if (UseCompressedOops) {
1864 // Limit the heap size to the maximum possible when using compressed oops
1865 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1866
1867 // HeapBaseMinAddress can be greater than default but not less than.
1868 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1869 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1870 // matches compressed oops printing flags
1871 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1872 jio_fprintf(defaultStream::error_stream(),
1873 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1874 " (" SIZE_FORMAT "G) which is greater than value given "
1875 SIZE_FORMAT "\n",
1876 DefaultHeapBaseMinAddress,
1877 DefaultHeapBaseMinAddress/G,
1878 HeapBaseMinAddress);
1879 }
1880 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1881 }
1882 }
1883
1884 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1885 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1886 // but it should be not less than default MaxHeapSize.
1887 max_coop_heap -= HeapBaseMinAddress;
1888 }
1889 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1890 }
1891 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1892
1893 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1894 // An initial heap size was specified on the command line,
1895 // so be sure that the maximum size is consistent. Done
1896 // after call to limit_by_allocatable_memory because that
1897 // method might reduce the allocation size.
1898 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1899 }
1900
1901 if (PrintGCDetails && Verbose) {
1902 // Cannot use gclog_or_tty yet.
1903 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1904 }
1905 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1906 }
1907
1908 // If the minimum or initial heap_size have not been set or requested to be set
1909 // ergonomically, set them accordingly.
1910 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1911 julong reasonable_minimum = (julong)(OldSize + NewSize);
1912
1913 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1914
1915 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1916
1917 if (InitialHeapSize == 0) {
1918 julong reasonable_initial = phys_mem / InitialRAMFraction;
1919
1920 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1921 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1922
1923 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1924
1925 if (PrintGCDetails && Verbose) {
1926 // Cannot use gclog_or_tty yet.
1927 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1928 }
1929 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1930 }
1931 // If the minimum heap size has not been set (via -Xms),
1932 // synchronize with InitialHeapSize to avoid errors with the default value.
1933 if (min_heap_size() == 0) {
1934 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1935 if (PrintGCDetails && Verbose) {
1936 // Cannot use gclog_or_tty yet.
1937 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1938 }
1939 }
1940 }
1941 }
1942
1943 // This must be called after ergonomics.
1944 void Arguments::set_bytecode_flags() {
1945 if (!RewriteBytecodes) {
1946 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1947 }
1948 }
1949
1950 // Aggressive optimization flags -XX:+AggressiveOpts
1951 void Arguments::set_aggressive_opts_flags() {
1952 #ifdef COMPILER2
1953 if (AggressiveUnboxing) {
1954 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1955 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1956 } else if (!EliminateAutoBox) {
1957 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1958 AggressiveUnboxing = false;
1959 }
1960 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1961 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1962 } else if (!DoEscapeAnalysis) {
1963 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1964 AggressiveUnboxing = false;
1965 }
1966 }
1967 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1968 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1969 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1970 }
1971 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1972 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1973 }
1974
1975 // Feed the cache size setting into the JDK
1976 char buffer[1024];
1977 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1978 add_property(buffer);
1979 }
1980 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1981 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1982 }
1983 #endif
1984
1985 if (AggressiveOpts) {
1986 // Sample flag setting code
1987 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1988 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1989 // }
1990 }
1991 }
1992
1993 //===========================================================================================================
1994 // Parsing of java.compiler property
1995
1996 void Arguments::process_java_compiler_argument(char* arg) {
1997 // For backwards compatibility, Djava.compiler=NONE or ""
1998 // causes us to switch to -Xint mode UNLESS -Xdebug
1999 // is also specified.
2000 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2001 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2002 }
2003 }
2004
2005 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2006 _sun_java_launcher = os::strdup_check_oom(launcher);
2007 }
2008
2009 bool Arguments::created_by_java_launcher() {
2010 assert(_sun_java_launcher != NULL, "property must have value");
2011 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2012 }
2013
2014 bool Arguments::sun_java_launcher_is_altjvm() {
2015 return _sun_java_launcher_is_altjvm;
2016 }
2017
2018 //===========================================================================================================
2019 // Parsing of main arguments
2020
2021 bool Arguments::verify_interval(uintx val, uintx min,
2022 uintx max, const char* name) {
2023 // Returns true iff value is in the inclusive interval [min..max]
2024 // false, otherwise.
2025 if (val >= min && val <= max) {
2026 return true;
2027 }
2028 jio_fprintf(defaultStream::error_stream(),
2029 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2030 " and " UINTX_FORMAT "\n",
2031 name, val, min, max);
2032 return false;
2033 }
2034
2035 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2036 // Returns true if given value is at least specified min threshold
2037 // false, otherwise.
2038 if (val >= min ) {
2039 return true;
2040 }
2041 jio_fprintf(defaultStream::error_stream(),
2042 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2043 name, val, min);
2044 return false;
2045 }
2046
2047 bool Arguments::verify_percentage(uintx value, const char* name) {
2048 if (is_percentage(value)) {
2049 return true;
2050 }
2051 jio_fprintf(defaultStream::error_stream(),
2052 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2053 name, value);
2054 return false;
2055 }
2056
2057 // check if do gclog rotation
2058 // +UseGCLogFileRotation is a must,
2059 // no gc log rotation when log file not supplied or
2060 // NumberOfGCLogFiles is 0
2061 void check_gclog_consistency() {
2062 if (UseGCLogFileRotation) {
2063 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2064 jio_fprintf(defaultStream::output_stream(),
2065 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2066 "where num_of_file > 0\n"
2067 "GC log rotation is turned off\n");
2068 UseGCLogFileRotation = false;
2069 }
2070 }
2071
2072 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2073 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K);
2074 jio_fprintf(defaultStream::output_stream(),
2075 "GCLogFileSize changed to minimum 8K\n");
2076 }
2077 }
2078
2079 // This function is called for -Xloggc:<filename>, it can be used
2080 // to check if a given file name(or string) conforms to the following
2081 // specification:
2082 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2083 // %p and %t only allowed once. We only limit usage of filename not path
2084 bool is_filename_valid(const char *file_name) {
2085 const char* p = file_name;
2086 char file_sep = os::file_separator()[0];
2087 const char* cp;
2088 // skip prefix path
2089 for (cp = file_name; *cp != '\0'; cp++) {
2090 if (*cp == '/' || *cp == file_sep) {
2091 p = cp + 1;
2092 }
2093 }
2094
2095 int count_p = 0;
2096 int count_t = 0;
2097 while (*p != '\0') {
2098 if ((*p >= '0' && *p <= '9') ||
2099 (*p >= 'A' && *p <= 'Z') ||
2100 (*p >= 'a' && *p <= 'z') ||
2101 *p == '-' ||
2102 *p == '_' ||
2103 *p == '.') {
2104 p++;
2105 continue;
2106 }
2107 if (*p == '%') {
2108 if(*(p + 1) == 'p') {
2109 p += 2;
2110 count_p ++;
2111 continue;
2112 }
2113 if (*(p + 1) == 't') {
2114 p += 2;
2115 count_t ++;
2116 continue;
2117 }
2118 }
2119 return false;
2120 }
2121 return count_p < 2 && count_t < 2;
2122 }
2123
2124 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2125 if (!is_percentage(min_heap_free_ratio)) {
2126 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2127 return false;
2128 }
2129 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2130 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2131 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2132 MaxHeapFreeRatio);
2133 return false;
2134 }
2135 // This does not set the flag itself, but stores the value in a safe place for later usage.
2136 _min_heap_free_ratio = min_heap_free_ratio;
2137 return true;
2138 }
2139
2140 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2141 if (!is_percentage(max_heap_free_ratio)) {
2142 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2143 return false;
2144 }
2145 if (max_heap_free_ratio < MinHeapFreeRatio) {
2146 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2147 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2148 MinHeapFreeRatio);
2149 return false;
2150 }
2151 // This does not set the flag itself, but stores the value in a safe place for later usage.
2152 _max_heap_free_ratio = max_heap_free_ratio;
2153 return true;
2154 }
2155
2156 // Check consistency of GC selection
2157 bool Arguments::check_gc_consistency() {
2158 check_gclog_consistency();
2159 // Ensure that the user has not selected conflicting sets
2160 // of collectors.
2161 uint i = 0;
2162 if (UseSerialGC) i++;
2163 if (UseConcMarkSweepGC) i++;
2164 if (UseParallelGC || UseParallelOldGC) i++;
2165 if (UseG1GC) i++;
2166 if (i > 1) {
2167 jio_fprintf(defaultStream::error_stream(),
2168 "Conflicting collector combinations in option list; "
2169 "please refer to the release notes for the combinations "
2170 "allowed\n");
2171 return false;
2172 }
2173
2174 if (UseConcMarkSweepGC && !UseParNewGC) {
2175 jio_fprintf(defaultStream::error_stream(),
2176 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2177 return false;
2178 }
2179
2180 if (UseParNewGC && !UseConcMarkSweepGC) {
2181 jio_fprintf(defaultStream::error_stream(),
2182 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2183 return false;
2184 }
2185
2186 return true;
2187 }
2188
2189 void Arguments::check_deprecated_gc_flags() {
2190 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2191 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2192 }
2193 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2194 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2195 "and will likely be removed in future release");
2196 }
2197 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2198 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2199 "Use MaxRAMFraction instead.");
2200 }
2201 }
2202
2203 // Check stack pages settings
2204 bool Arguments::check_stack_pages()
2205 {
2206 bool status = true;
2207 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2208 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2209 // greater stack shadow pages can't generate instruction to bang stack
2210 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2211 return status;
2212 }
2213
2214 // Check the consistency of vm_init_args
2215 bool Arguments::check_vm_args_consistency() {
2216 // Method for adding checks for flag consistency.
2217 // The intent is to warn the user of all possible conflicts,
2218 // before returning an error.
2219 // Note: Needs platform-dependent factoring.
2220 bool status = true;
2221
2222 if (TLABRefillWasteFraction == 0) {
2223 jio_fprintf(defaultStream::error_stream(),
2224 "TLABRefillWasteFraction should be a denominator, "
2225 "not " SIZE_FORMAT "\n",
2226 TLABRefillWasteFraction);
2227 status = false;
2228 }
2229
2230 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2231 "AdaptiveSizePolicyWeight");
2232 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2233
2234 // Divide by bucket size to prevent a large size from causing rollover when
2235 // calculating amount of memory needed to be allocated for the String table.
2236 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2237 (max_uintx / StringTable::bucket_size()), "StringTable size");
2238
2239 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2240 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2241
2242 {
2243 // Using "else if" below to avoid printing two error messages if min > max.
2244 // This will also prevent us from reporting both min>100 and max>100 at the
2245 // same time, but that is less annoying than printing two identical errors IMHO.
2246 FormatBuffer<80> err_msg("%s","");
2247 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2248 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2249 status = false;
2250 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2251 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2252 status = false;
2253 }
2254 }
2255
2256 // Min/MaxMetaspaceFreeRatio
2257 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2258 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2259
2260 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2261 jio_fprintf(defaultStream::error_stream(),
2262 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2263 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2264 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2265 MinMetaspaceFreeRatio,
2266 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2267 MaxMetaspaceFreeRatio);
2268 status = false;
2269 }
2270
2271 // Trying to keep 100% free is not practical
2272 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2273
2274 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2275 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2276 }
2277
2278 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2279 // Settings to encourage splitting.
2280 if (!FLAG_IS_CMDLINE(NewRatio)) {
2281 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2282 }
2283 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2284 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2285 }
2286 }
2287
2288 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2289 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2290 }
2291
2292 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2293 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2294 if (GCTimeLimit == 100) {
2295 // Turn off gc-overhead-limit-exceeded checks
2296 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2297 }
2298
2299 status = status && check_gc_consistency();
2300 status = status && check_stack_pages();
2301
2302 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2303 "CMSIncrementalSafetyFactor");
2304
2305 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2306 // insists that we hold the requisite locks so that the iteration is
2307 // MT-safe. For the verification at start-up and shut-down, we don't
2308 // yet have a good way of acquiring and releasing these locks,
2309 // which are not visible at the CollectedHeap level. We want to
2310 // be able to acquire these locks and then do the iteration rather
2311 // than just disable the lock verification. This will be fixed under
2312 // bug 4788986.
2313 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2314 if (VerifyDuringStartup) {
2315 warning("Heap verification at start-up disabled "
2316 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2317 VerifyDuringStartup = false; // Disable verification at start-up
2318 }
2319
2320 if (VerifyBeforeExit) {
2321 warning("Heap verification at shutdown disabled "
2322 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2323 VerifyBeforeExit = false; // Disable verification at shutdown
2324 }
2325 }
2326
2327 // Note: only executed in non-PRODUCT mode
2328 if (!UseAsyncConcMarkSweepGC &&
2329 (ExplicitGCInvokesConcurrent ||
2330 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2333 " with -UseAsyncConcMarkSweepGC");
2334 status = false;
2335 }
2336
2337 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2338
2339 #if INCLUDE_ALL_GCS
2340 if (UseG1GC) {
2341 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2342 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2343 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2344
2345 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2346 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2347 "InitiatingHeapOccupancyPercent");
2348 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2349 "G1RefProcDrainInterval");
2350 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2351 "G1ConcMarkStepDurationMillis");
2352 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2353 "G1ConcRSHotCardLimit");
2354 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2355 "G1ConcRSLogCacheSize");
2356 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2357 "StringDeduplicationAgeThreshold");
2358 }
2359 if (UseConcMarkSweepGC) {
2360 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2361 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2362 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2363 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2364
2365 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2366
2367 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2368 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2369 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2370
2371 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2372
2373 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2374 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2375
2376 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2377 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2378 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2379
2380 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2381
2382 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2383
2384 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2385 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2386 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2387 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2388 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2389 }
2390
2391 if (UseParallelGC || UseParallelOldGC) {
2392 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2393 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2394
2395 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2396 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2397
2398 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2399 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2400
2401 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2402
2403 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2404 }
2405 #endif // INCLUDE_ALL_GCS
2406
2407 status = status && verify_interval(RefDiscoveryPolicy,
2408 ReferenceProcessor::DiscoveryPolicyMin,
2409 ReferenceProcessor::DiscoveryPolicyMax,
2410 "RefDiscoveryPolicy");
2411
2412 // Limit the lower bound of this flag to 1 as it is used in a division
2413 // expression.
2414 status = status && verify_interval(TLABWasteTargetPercent,
2415 1, 100, "TLABWasteTargetPercent");
2416
2417 status = status && verify_object_alignment();
2418
2419 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2420 "CompressedClassSpaceSize");
2421
2422 status = status && verify_interval(MarkStackSizeMax,
2423 1, (max_jint - 1), "MarkStackSizeMax");
2424 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2425
2426 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2427
2428 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread");
2429
2430 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2431
2432 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2433 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2434
2435 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2436
2437 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2438 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2439 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2440 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2441
2442 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2443 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2444
2445 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2446 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2447 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2448
2449 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2450 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2451
2452 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2453 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2454 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2455 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2456
2457 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2458 #ifdef COMPILER1
2459 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2460 #endif
2461 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2462
2463 if (PrintNMTStatistics) {
2464 #if INCLUDE_NMT
2465 if (MemTracker::tracking_level() == NMT_off) {
2466 #endif // INCLUDE_NMT
2467 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2468 PrintNMTStatistics = false;
2469 #if INCLUDE_NMT
2470 }
2471 #endif
2472 }
2473
2474 // Need to limit the extent of the padding to reasonable size.
2475 // 8K is well beyond the reasonable HW cache line size, even with the
2476 // aggressive prefetching, while still leaving the room for segregating
2477 // among the distinct pages.
2478 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2479 jio_fprintf(defaultStream::error_stream(),
2480 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2481 ContendedPaddingWidth, 0, 8192);
2482 status = false;
2483 }
2484
2485 // Need to enforce the padding not to break the existing field alignments.
2486 // It is sufficient to check against the largest type size.
2487 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2488 jio_fprintf(defaultStream::error_stream(),
2489 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2490 ContendedPaddingWidth, BytesPerLong);
2491 status = false;
2492 }
2493
2494 // Check lower bounds of the code cache
2495 // Template Interpreter code is approximately 3X larger in debug builds.
2496 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2497 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2500 os::vm_page_size()/K);
2501 status = false;
2502 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2503 jio_fprintf(defaultStream::error_stream(),
2504 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2505 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2506 status = false;
2507 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2508 jio_fprintf(defaultStream::error_stream(),
2509 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2510 min_code_cache_size/K);
2511 status = false;
2512 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2513 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2516 CODE_CACHE_SIZE_LIMIT/M);
2517 status = false;
2518 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2519 jio_fprintf(defaultStream::error_stream(),
2520 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2521 min_code_cache_size/K);
2522 status = false;
2523 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2524 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2525 jio_fprintf(defaultStream::error_stream(),
2526 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2527 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2528 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2529 status = false;
2530 }
2531
2532 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2533 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2534 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2535 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2536
2537
2538 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2539 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2540 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2541 // Check the minimum number of compiler threads
2542 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2543
2544 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2545 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2546 }
2547
2548 return status;
2549 }
2550
2551 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2552 const char* option_type) {
2553 if (ignore) return false;
2554
2555 const char* spacer = " ";
2556 if (option_type == NULL) {
2557 option_type = ++spacer; // Set both to the empty string.
2558 }
2559
2560 if (os::obsolete_option(option)) {
2561 jio_fprintf(defaultStream::error_stream(),
2562 "Obsolete %s%soption: %s\n", option_type, spacer,
2563 option->optionString);
2564 return false;
2565 } else {
2566 jio_fprintf(defaultStream::error_stream(),
2567 "Unrecognized %s%soption: %s\n", option_type, spacer,
2568 option->optionString);
2569 return true;
2570 }
2571 }
2572
2573 static const char* user_assertion_options[] = {
2574 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2575 };
2576
2577 static const char* system_assertion_options[] = {
2578 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2579 };
2580
2581 bool Arguments::parse_uintx(const char* value,
2582 uintx* uintx_arg,
2583 uintx min_size) {
2584
2585 // Check the sign first since atomull() parses only unsigned values.
2586 bool value_is_positive = !(*value == '-');
2587
2588 if (value_is_positive) {
2589 julong n;
2590 bool good_return = atomull(value, &n);
2591 if (good_return) {
2592 bool above_minimum = n >= min_size;
2593 bool value_is_too_large = n > max_uintx;
2594
2595 if (above_minimum && !value_is_too_large) {
2596 *uintx_arg = n;
2597 return true;
2598 }
2599 }
2600 }
2601 return false;
2602 }
2603
2604 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2605 julong* long_arg,
2606 julong min_size) {
2607 if (!atomull(s, long_arg)) return arg_unreadable;
2608 return check_memory_size(*long_arg, min_size);
2609 }
2610
2611 // Parse JavaVMInitArgs structure
2612
2613 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2614 // For components of the system classpath.
2615 SysClassPath scp(Arguments::get_sysclasspath());
2616 bool scp_assembly_required = false;
2617
2618 // Save default settings for some mode flags
2619 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2620 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2621 Arguments::_ClipInlining = ClipInlining;
2622 Arguments::_BackgroundCompilation = BackgroundCompilation;
2623 if (TieredCompilation) {
2624 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2625 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2626 }
2627
2628 // Setup flags for mixed which is the default
2629 set_mode_flags(_mixed);
2630
2631 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2632 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2633 if (result != JNI_OK) {
2634 return result;
2635 }
2636
2637 // Parse JavaVMInitArgs structure passed in
2638 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2639 if (result != JNI_OK) {
2640 return result;
2641 }
2642
2643 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2644 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2645 if (result != JNI_OK) {
2646 return result;
2647 }
2648
2649 // Do final processing now that all arguments have been parsed
2650 result = finalize_vm_init_args(&scp, scp_assembly_required);
2651 if (result != JNI_OK) {
2652 return result;
2653 }
2654
2655 return JNI_OK;
2656 }
2657
2658 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2659 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2660 // are dealing with -agentpath (case where name is a path), otherwise with
2661 // -agentlib
2662 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2663 char *_name;
2664 const char *_hprof = "hprof", *_jdwp = "jdwp";
2665 size_t _len_hprof, _len_jdwp, _len_prefix;
2666
2667 if (is_path) {
2668 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2669 return false;
2670 }
2671
2672 _name++; // skip past last path separator
2673 _len_prefix = strlen(JNI_LIB_PREFIX);
2674
2675 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2676 return false;
2677 }
2678
2679 _name += _len_prefix;
2680 _len_hprof = strlen(_hprof);
2681 _len_jdwp = strlen(_jdwp);
2682
2683 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2684 _name += _len_hprof;
2685 }
2686 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2687 _name += _len_jdwp;
2688 }
2689 else {
2690 return false;
2691 }
2692
2693 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2694 return false;
2695 }
2696
2697 return true;
2698 }
2699
2700 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2701 return true;
2702 }
2703
2704 return false;
2705 }
2706
2707 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2708 SysClassPath* scp_p,
2709 bool* scp_assembly_required_p,
2710 Flag::Flags origin) {
2711 // Remaining part of option string
2712 const char* tail;
2713
2714 // iterate over arguments
2715 DumpVMOptions(args, "Parse each");
2716 for (int index = 0; index < args->nOptions; index++) {
2717 bool is_absolute_path = false; // for -agentpath vs -agentlib
2718
2719 const JavaVMOption* option = args->options + index;
2720
2721 if (!match_option(option, "-Djava.class.path", &tail) &&
2722 !match_option(option, "-Dsun.java.command", &tail) &&
2723 !match_option(option, "-Dsun.java.launcher", &tail)) {
2724
2725 // add all jvm options to the jvm_args string. This string
2726 // is used later to set the java.vm.args PerfData string constant.
2727 // the -Djava.class.path and the -Dsun.java.command options are
2728 // omitted from jvm_args string as each have their own PerfData
2729 // string constant object.
2730 build_jvm_args(option->optionString);
2731 }
2732
2733 // -verbose:[class/gc/jni]
2734 if (match_option(option, "-verbose", &tail)) {
2735 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2736 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2737 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2738 } else if (!strcmp(tail, ":gc")) {
2739 FLAG_SET_CMDLINE(bool, PrintGC, true);
2740 } else if (!strcmp(tail, ":jni")) {
2741 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2742 }
2743 // -da / -ea / -disableassertions / -enableassertions
2744 // These accept an optional class/package name separated by a colon, e.g.,
2745 // -da:java.lang.Thread.
2746 } else if (match_option(option, user_assertion_options, &tail, true)) {
2747 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2748 if (*tail == '\0') {
2749 JavaAssertions::setUserClassDefault(enable);
2750 } else {
2751 assert(*tail == ':', "bogus match by match_option()");
2752 JavaAssertions::addOption(tail + 1, enable);
2753 }
2754 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2755 } else if (match_option(option, system_assertion_options, &tail, false)) {
2756 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2757 JavaAssertions::setSystemClassDefault(enable);
2758 // -bootclasspath:
2759 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2760 scp_p->reset_path(tail);
2761 *scp_assembly_required_p = true;
2762 // -bootclasspath/a:
2763 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2764 scp_p->add_suffix(tail);
2765 *scp_assembly_required_p = true;
2766 // -bootclasspath/p:
2767 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2768 scp_p->add_prefix(tail);
2769 *scp_assembly_required_p = true;
2770 // -Xrun
2771 } else if (match_option(option, "-Xrun", &tail)) {
2772 if (tail != NULL) {
2773 const char* pos = strchr(tail, ':');
2774 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2775 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2776 name[len] = '\0';
2777
2778 char *options = NULL;
2779 if(pos != NULL) {
2780 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2781 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2782 }
2783 #if !INCLUDE_JVMTI
2784 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2785 jio_fprintf(defaultStream::error_stream(),
2786 "Profiling and debugging agents are not supported in this VM\n");
2787 return JNI_ERR;
2788 }
2789 #endif // !INCLUDE_JVMTI
2790 add_init_library(name, options);
2791 }
2792 // -agentlib and -agentpath
2793 } else if (match_option(option, "-agentlib:", &tail) ||
2794 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2795 if(tail != NULL) {
2796 const char* pos = strchr(tail, '=');
2797 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2798 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2799 name[len] = '\0';
2800
2801 char *options = NULL;
2802 if(pos != NULL) {
2803 options = os::strdup_check_oom(pos + 1, mtInternal);
2804 }
2805 #if !INCLUDE_JVMTI
2806 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Profiling and debugging agents are not supported in this VM\n");
2809 return JNI_ERR;
2810 }
2811 #endif // !INCLUDE_JVMTI
2812 add_init_agent(name, options, is_absolute_path);
2813 }
2814 // -javaagent
2815 } else if (match_option(option, "-javaagent:", &tail)) {
2816 #if !INCLUDE_JVMTI
2817 jio_fprintf(defaultStream::error_stream(),
2818 "Instrumentation agents are not supported in this VM\n");
2819 return JNI_ERR;
2820 #else
2821 if(tail != NULL) {
2822 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2823 add_init_agent("instrument", options, false);
2824 }
2825 #endif // !INCLUDE_JVMTI
2826 // -Xnoclassgc
2827 } else if (match_option(option, "-Xnoclassgc")) {
2828 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2829 // -Xconcgc
2830 } else if (match_option(option, "-Xconcgc")) {
2831 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2832 // -Xnoconcgc
2833 } else if (match_option(option, "-Xnoconcgc")) {
2834 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2835 // -Xbatch
2836 } else if (match_option(option, "-Xbatch")) {
2837 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2838 // -Xmn for compatibility with other JVM vendors
2839 } else if (match_option(option, "-Xmn", &tail)) {
2840 julong long_initial_young_size = 0;
2841 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2842 if (errcode != arg_in_range) {
2843 jio_fprintf(defaultStream::error_stream(),
2844 "Invalid initial young generation size: %s\n", option->optionString);
2845 describe_range_error(errcode);
2846 return JNI_EINVAL;
2847 }
2848 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size);
2849 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size);
2850 // -Xms
2851 } else if (match_option(option, "-Xms", &tail)) {
2852 julong long_initial_heap_size = 0;
2853 // an initial heap size of 0 means automatically determine
2854 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2855 if (errcode != arg_in_range) {
2856 jio_fprintf(defaultStream::error_stream(),
2857 "Invalid initial heap size: %s\n", option->optionString);
2858 describe_range_error(errcode);
2859 return JNI_EINVAL;
2860 }
2861 set_min_heap_size((size_t)long_initial_heap_size);
2862 // Currently the minimum size and the initial heap sizes are the same.
2863 // Can be overridden with -XX:InitialHeapSize.
2864 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size);
2865 // -Xmx
2866 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2867 julong long_max_heap_size = 0;
2868 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2869 if (errcode != arg_in_range) {
2870 jio_fprintf(defaultStream::error_stream(),
2871 "Invalid maximum heap size: %s\n", option->optionString);
2872 describe_range_error(errcode);
2873 return JNI_EINVAL;
2874 }
2875 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size);
2876 // Xmaxf
2877 } else if (match_option(option, "-Xmaxf", &tail)) {
2878 char* err;
2879 int maxf = (int)(strtod(tail, &err) * 100);
2880 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2881 jio_fprintf(defaultStream::error_stream(),
2882 "Bad max heap free percentage size: %s\n",
2883 option->optionString);
2884 return JNI_EINVAL;
2885 } else {
2886 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2887 }
2888 // Xminf
2889 } else if (match_option(option, "-Xminf", &tail)) {
2890 char* err;
2891 int minf = (int)(strtod(tail, &err) * 100);
2892 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2893 jio_fprintf(defaultStream::error_stream(),
2894 "Bad min heap free percentage size: %s\n",
2895 option->optionString);
2896 return JNI_EINVAL;
2897 } else {
2898 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2899 }
2900 // -Xss
2901 } else if (match_option(option, "-Xss", &tail)) {
2902 julong long_ThreadStackSize = 0;
2903 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2904 if (errcode != arg_in_range) {
2905 jio_fprintf(defaultStream::error_stream(),
2906 "Invalid thread stack size: %s\n", option->optionString);
2907 describe_range_error(errcode);
2908 return JNI_EINVAL;
2909 }
2910 // Internally track ThreadStackSize in units of 1024 bytes.
2911 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2912 round_to((int)long_ThreadStackSize, K) / K);
2913 // -Xoss
2914 } else if (match_option(option, "-Xoss", &tail)) {
2915 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2916 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2917 julong long_CodeCacheExpansionSize = 0;
2918 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2919 if (errcode != arg_in_range) {
2920 jio_fprintf(defaultStream::error_stream(),
2921 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2922 os::vm_page_size()/K);
2923 return JNI_EINVAL;
2924 }
2925 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2926 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2927 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2928 julong long_ReservedCodeCacheSize = 0;
2929
2930 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2931 if (errcode != arg_in_range) {
2932 jio_fprintf(defaultStream::error_stream(),
2933 "Invalid maximum code cache size: %s.\n", option->optionString);
2934 return JNI_EINVAL;
2935 }
2936 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2937 // -XX:NonNMethodCodeHeapSize=
2938 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2939 julong long_NonNMethodCodeHeapSize = 0;
2940
2941 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2942 if (errcode != arg_in_range) {
2943 jio_fprintf(defaultStream::error_stream(),
2944 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2945 return JNI_EINVAL;
2946 }
2947 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2948 // -XX:ProfiledCodeHeapSize=
2949 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2950 julong long_ProfiledCodeHeapSize = 0;
2951
2952 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2953 if (errcode != arg_in_range) {
2954 jio_fprintf(defaultStream::error_stream(),
2955 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2956 return JNI_EINVAL;
2957 }
2958 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2959 // -XX:NonProfiledCodeHeapSizee=
2960 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2961 julong long_NonProfiledCodeHeapSize = 0;
2962
2963 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2964 if (errcode != arg_in_range) {
2965 jio_fprintf(defaultStream::error_stream(),
2966 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2967 return JNI_EINVAL;
2968 }
2969 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2970 //-XX:IncreaseFirstTierCompileThresholdAt=
2971 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2972 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2973 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2974 jio_fprintf(defaultStream::error_stream(),
2975 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2976 option->optionString);
2977 return JNI_EINVAL;
2978 }
2979 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2980 // -green
2981 } else if (match_option(option, "-green")) {
2982 jio_fprintf(defaultStream::error_stream(),
2983 "Green threads support not available\n");
2984 return JNI_EINVAL;
2985 // -native
2986 } else if (match_option(option, "-native")) {
2987 // HotSpot always uses native threads, ignore silently for compatibility
2988 // -Xsqnopause
2989 } else if (match_option(option, "-Xsqnopause")) {
2990 // EVM option, ignore silently for compatibility
2991 // -Xrs
2992 } else if (match_option(option, "-Xrs")) {
2993 // Classic/EVM option, new functionality
2994 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2995 } else if (match_option(option, "-Xusealtsigs")) {
2996 // change default internal VM signals used - lower case for back compat
2997 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2998 // -Xoptimize
2999 } else if (match_option(option, "-Xoptimize")) {
3000 // EVM option, ignore silently for compatibility
3001 // -Xprof
3002 } else if (match_option(option, "-Xprof")) {
3003 #if INCLUDE_FPROF
3004 _has_profile = true;
3005 #else // INCLUDE_FPROF
3006 jio_fprintf(defaultStream::error_stream(),
3007 "Flat profiling is not supported in this VM.\n");
3008 return JNI_ERR;
3009 #endif // INCLUDE_FPROF
3010 // -Xconcurrentio
3011 } else if (match_option(option, "-Xconcurrentio")) {
3012 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3013 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3014 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3015 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3016 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3017
3018 // -Xinternalversion
3019 } else if (match_option(option, "-Xinternalversion")) {
3020 jio_fprintf(defaultStream::output_stream(), "%s\n",
3021 VM_Version::internal_vm_info_string());
3022 vm_exit(0);
3023 #ifndef PRODUCT
3024 // -Xprintflags
3025 } else if (match_option(option, "-Xprintflags")) {
3026 CommandLineFlags::printFlags(tty, false);
3027 vm_exit(0);
3028 #endif
3029 // -D
3030 } else if (match_option(option, "-D", &tail)) {
3031 const char* value;
3032 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3033 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3034 // abort if -Djava.endorsed.dirs is set
3035 jio_fprintf(defaultStream::output_stream(),
3036 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3037 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3038 return JNI_EINVAL;
3039 }
3040 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3041 *value != '\0' && strcmp(value, "\"\"") != 0) {
3042 // abort if -Djava.ext.dirs is set
3043 jio_fprintf(defaultStream::output_stream(),
3044 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3045 return JNI_EINVAL;
3046 }
3047
3048 if (!add_property(tail)) {
3049 return JNI_ENOMEM;
3050 }
3051 // Out of the box management support
3052 if (match_option(option, "-Dcom.sun.management", &tail)) {
3053 #if INCLUDE_MANAGEMENT
3054 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3055 #else
3056 jio_fprintf(defaultStream::output_stream(),
3057 "-Dcom.sun.management is not supported in this VM.\n");
3058 return JNI_ERR;
3059 #endif
3060 }
3061 // -Xint
3062 } else if (match_option(option, "-Xint")) {
3063 set_mode_flags(_int);
3064 // -Xmixed
3065 } else if (match_option(option, "-Xmixed")) {
3066 set_mode_flags(_mixed);
3067 // -Xcomp
3068 } else if (match_option(option, "-Xcomp")) {
3069 // for testing the compiler; turn off all flags that inhibit compilation
3070 set_mode_flags(_comp);
3071 // -Xshare:dump
3072 } else if (match_option(option, "-Xshare:dump")) {
3073 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3074 set_mode_flags(_int); // Prevent compilation, which creates objects
3075 // -Xshare:on
3076 } else if (match_option(option, "-Xshare:on")) {
3077 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3078 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3079 // -Xshare:auto
3080 } else if (match_option(option, "-Xshare:auto")) {
3081 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3082 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3083 // -Xshare:off
3084 } else if (match_option(option, "-Xshare:off")) {
3085 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3086 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3087 // -Xverify
3088 } else if (match_option(option, "-Xverify", &tail)) {
3089 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3090 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3091 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3092 } else if (strcmp(tail, ":remote") == 0) {
3093 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3094 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3095 } else if (strcmp(tail, ":none") == 0) {
3096 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3097 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3098 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3099 return JNI_EINVAL;
3100 }
3101 // -Xdebug
3102 } else if (match_option(option, "-Xdebug")) {
3103 // note this flag has been used, then ignore
3104 set_xdebug_mode(true);
3105 // -Xnoagent
3106 } else if (match_option(option, "-Xnoagent")) {
3107 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3108 } else if (match_option(option, "-Xboundthreads")) {
3109 // Ignore silently for compatibility
3110 } else if (match_option(option, "-Xloggc:", &tail)) {
3111 // Redirect GC output to the file. -Xloggc:<filename>
3112 // ostream_init_log(), when called will use this filename
3113 // to initialize a fileStream.
3114 _gc_log_filename = os::strdup_check_oom(tail);
3115 if (!is_filename_valid(_gc_log_filename)) {
3116 jio_fprintf(defaultStream::output_stream(),
3117 "Invalid file name for use with -Xloggc: Filename can only contain the "
3118 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3119 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3120 return JNI_EINVAL;
3121 }
3122 FLAG_SET_CMDLINE(bool, PrintGC, true);
3123 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3124
3125 // JNI hooks
3126 } else if (match_option(option, "-Xcheck", &tail)) {
3127 if (!strcmp(tail, ":jni")) {
3128 #if !INCLUDE_JNI_CHECK
3129 warning("JNI CHECKING is not supported in this VM");
3130 #else
3131 CheckJNICalls = true;
3132 #endif // INCLUDE_JNI_CHECK
3133 } else if (is_bad_option(option, args->ignoreUnrecognized,
3134 "check")) {
3135 return JNI_EINVAL;
3136 }
3137 } else if (match_option(option, "vfprintf")) {
3138 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3139 } else if (match_option(option, "exit")) {
3140 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3141 } else if (match_option(option, "abort")) {
3142 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3143 // -XX:+AggressiveHeap
3144 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3145
3146 // This option inspects the machine and attempts to set various
3147 // parameters to be optimal for long-running, memory allocation
3148 // intensive jobs. It is intended for machines with large
3149 // amounts of cpu and memory.
3150
3151 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3152 // VM, but we may not be able to represent the total physical memory
3153 // available (like having 8gb of memory on a box but using a 32bit VM).
3154 // Thus, we need to make sure we're using a julong for intermediate
3155 // calculations.
3156 julong initHeapSize;
3157 julong total_memory = os::physical_memory();
3158
3159 if (total_memory < (julong)256*M) {
3160 jio_fprintf(defaultStream::error_stream(),
3161 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3162 vm_exit(1);
3163 }
3164
3165 // The heap size is half of available memory, or (at most)
3166 // all of possible memory less 160mb (leaving room for the OS
3167 // when using ISM). This is the maximum; because adaptive sizing
3168 // is turned on below, the actual space used may be smaller.
3169
3170 initHeapSize = MIN2(total_memory / (julong)2,
3171 total_memory - (julong)160*M);
3172
3173 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3174
3175 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3176 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize);
3177 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize);
3178 // Currently the minimum size and the initial heap sizes are the same.
3179 set_min_heap_size(initHeapSize);
3180 }
3181 if (FLAG_IS_DEFAULT(NewSize)) {
3182 // Make the young generation 3/8ths of the total heap.
3183 FLAG_SET_CMDLINE(size_t, NewSize,
3184 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3185 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize);
3186 }
3187
3188 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3189 FLAG_SET_DEFAULT(UseLargePages, true);
3190 #endif
3191
3192 // Increase some data structure sizes for efficiency
3193 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize);
3194 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3195 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K);
3196
3197 // See the OldPLABSize comment below, but replace 'after promotion'
3198 // with 'after copying'. YoungPLABSize is the size of the survivor
3199 // space per-gc-thread buffers. The default is 4kw.
3200 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words
3201
3202 // OldPLABSize is the size of the buffers in the old gen that
3203 // UseParallelGC uses to promote live data that doesn't fit in the
3204 // survivor spaces. At any given time, there's one for each gc thread.
3205 // The default size is 1kw. These buffers are rarely used, since the
3206 // survivor spaces are usually big enough. For specjbb, however, there
3207 // are occasions when there's lots of live data in the young gen
3208 // and we end up promoting some of it. We don't have a definite
3209 // explanation for why bumping OldPLABSize helps, but the theory
3210 // is that a bigger PLAB results in retaining something like the
3211 // original allocation order after promotion, which improves mutator
3212 // locality. A minor effect may be that larger PLABs reduce the
3213 // number of PLAB allocation events during gc. The value of 8kw
3214 // was arrived at by experimenting with specjbb.
3215 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words
3216
3217 // Enable parallel GC and adaptive generation sizing
3218 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3219 FLAG_SET_DEFAULT(ParallelGCThreads,
3220 Abstract_VM_Version::parallel_worker_threads());
3221
3222 // Encourage steady state memory management
3223 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3224
3225 // This appears to improve mutator locality
3226 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3227
3228 // Get around early Solaris scheduling bug
3229 // (affinity vs other jobs on system)
3230 // but disallow DR and offlining (5008695).
3231 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3232
3233 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3234 // and the last option wins.
3235 } else if (match_option(option, "-XX:+NeverTenure")) {
3236 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3237 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3238 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3239 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3240 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3241 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3242 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3243 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3244 uintx max_tenuring_thresh = 0;
3245 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3246 jio_fprintf(defaultStream::error_stream(),
3247 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail);
3248 return JNI_EINVAL;
3249 }
3250 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3251
3252 if (MaxTenuringThreshold == 0) {
3253 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3254 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3255 } else {
3256 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3257 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3258 }
3259 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3260 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3261 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3262 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3263 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3264 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3265 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3266 #if defined(DTRACE_ENABLED)
3267 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3268 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3269 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3270 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3271 #else // defined(DTRACE_ENABLED)
3272 jio_fprintf(defaultStream::error_stream(),
3273 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3274 return JNI_EINVAL;
3275 #endif // defined(DTRACE_ENABLED)
3276 #ifdef ASSERT
3277 } else if (match_option(option, "-XX:+FullGCALot")) {
3278 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3279 // disable scavenge before parallel mark-compact
3280 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3281 #endif
3282 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3283 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3284 julong stack_size = 0;
3285 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3286 if (errcode != arg_in_range) {
3287 jio_fprintf(defaultStream::error_stream(),
3288 "Invalid mark stack size: %s\n", option->optionString);
3289 describe_range_error(errcode);
3290 return JNI_EINVAL;
3291 }
3292 jio_fprintf(defaultStream::error_stream(),
3293 "Please use -XX:MarkStackSize in place of "
3294 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3295 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size);
3296 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3297 julong max_stack_size = 0;
3298 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3299 if (errcode != arg_in_range) {
3300 jio_fprintf(defaultStream::error_stream(),
3301 "Invalid maximum mark stack size: %s\n",
3302 option->optionString);
3303 describe_range_error(errcode);
3304 return JNI_EINVAL;
3305 }
3306 jio_fprintf(defaultStream::error_stream(),
3307 "Please use -XX:MarkStackSizeMax in place of "
3308 "-XX:CMSMarkStackSizeMax in the future\n");
3309 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size);
3310 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3311 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3312 uintx conc_threads = 0;
3313 if (!parse_uintx(tail, &conc_threads, 1)) {
3314 jio_fprintf(defaultStream::error_stream(),
3315 "Invalid concurrent threads: %s\n", option->optionString);
3316 return JNI_EINVAL;
3317 }
3318 jio_fprintf(defaultStream::error_stream(),
3319 "Please use -XX:ConcGCThreads in place of "
3320 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3321 FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads);
3322 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3323 julong max_direct_memory_size = 0;
3324 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3325 if (errcode != arg_in_range) {
3326 jio_fprintf(defaultStream::error_stream(),
3327 "Invalid maximum direct memory size: %s\n",
3328 option->optionString);
3329 describe_range_error(errcode);
3330 return JNI_EINVAL;
3331 }
3332 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size);
3333 #if !INCLUDE_MANAGEMENT
3334 } else if (match_option(option, "-XX:+ManagementServer")) {
3335 jio_fprintf(defaultStream::error_stream(),
3336 "ManagementServer is not supported in this VM.\n");
3337 return JNI_ERR;
3338 #endif // INCLUDE_MANAGEMENT
3339 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3340 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3341 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true);
3342 jio_fprintf(defaultStream::output_stream(),
3343 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3344 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3345 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false);
3346 jio_fprintf(defaultStream::output_stream(),
3347 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3348 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3349 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3350 // already been handled
3351 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3352 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3353 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3354 return JNI_EINVAL;
3355 }
3356 }
3357 // Unknown option
3358 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3359 return JNI_ERR;
3360 }
3361 }
3362
3363 // PrintSharedArchiveAndExit will turn on
3364 // -Xshare:on
3365 // -XX:+TraceClassPaths
3366 if (PrintSharedArchiveAndExit) {
3367 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3368 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3369 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3370 }
3371
3372 // Change the default value for flags which have different default values
3373 // when working with older JDKs.
3374 #ifdef LINUX
3375 if (JDK_Version::current().compare_major(6) <= 0 &&
3376 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3377 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3378 }
3379 #endif // LINUX
3380 fix_appclasspath();
3381 return JNI_OK;
3382 }
3383
3384 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3385 //
3386 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3387 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3388 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3389 // path is treated as the current directory.
3390 //
3391 // This causes problems with CDS, which requires that all directories specified in the classpath
3392 // must be empty. In most cases, applications do NOT want to load classes from the current
3393 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3394 // scripts compatible with CDS.
3395 void Arguments::fix_appclasspath() {
3396 if (IgnoreEmptyClassPaths) {
3397 const char separator = *os::path_separator();
3398 const char* src = _java_class_path->value();
3399
3400 // skip over all the leading empty paths
3401 while (*src == separator) {
3402 src ++;
3403 }
3404
3405 char* copy = os::strdup_check_oom(src, mtInternal);
3406
3407 // trim all trailing empty paths
3408 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3409 *tail = '\0';
3410 }
3411
3412 char from[3] = {separator, separator, '\0'};
3413 char to [2] = {separator, '\0'};
3414 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3415 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3416 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3417 }
3418
3419 _java_class_path->set_value(copy);
3420 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3421 }
3422
3423 if (!PrintSharedArchiveAndExit) {
3424 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3425 }
3426 }
3427
3428 static bool has_jar_files(const char* directory) {
3429 DIR* dir = os::opendir(directory);
3430 if (dir == NULL) return false;
3431
3432 struct dirent *entry;
3433 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3434 bool hasJarFile = false;
3435 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3436 const char* name = entry->d_name;
3437 const char* ext = name + strlen(name) - 4;
3438 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3439 }
3440 FREE_C_HEAP_ARRAY(char, dbuf);
3441 os::closedir(dir);
3442 return hasJarFile ;
3443 }
3444
3445 static int check_non_empty_dirs(const char* path) {
3446 const char separator = *os::path_separator();
3447 const char* const end = path + strlen(path);
3448 int nonEmptyDirs = 0;
3449 while (path < end) {
3450 const char* tmp_end = strchr(path, separator);
3451 if (tmp_end == NULL) {
3452 if (has_jar_files(path)) {
3453 nonEmptyDirs++;
3454 jio_fprintf(defaultStream::output_stream(),
3455 "Non-empty directory: %s\n", path);
3456 }
3457 path = end;
3458 } else {
3459 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3460 memcpy(dirpath, path, tmp_end - path);
3461 dirpath[tmp_end - path] = '\0';
3462 if (has_jar_files(dirpath)) {
3463 nonEmptyDirs++;
3464 jio_fprintf(defaultStream::output_stream(),
3465 "Non-empty directory: %s\n", dirpath);
3466 }
3467 FREE_C_HEAP_ARRAY(char, dirpath);
3468 path = tmp_end + 1;
3469 }
3470 }
3471 return nonEmptyDirs;
3472 }
3473
3474 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3475 // check if the default lib/endorsed directory exists; if so, error
3476 char path[JVM_MAXPATHLEN];
3477 const char* fileSep = os::file_separator();
3478 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3479
3480 if (CheckEndorsedAndExtDirs) {
3481 int nonEmptyDirs = 0;
3482 // check endorsed directory
3483 nonEmptyDirs += check_non_empty_dirs(path);
3484 // check the extension directories
3485 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3486 if (nonEmptyDirs > 0) {
3487 return JNI_ERR;
3488 }
3489 }
3490
3491 DIR* dir = os::opendir(path);
3492 if (dir != NULL) {
3493 jio_fprintf(defaultStream::output_stream(),
3494 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3495 "in modular form will be supported via the concept of upgradeable modules.\n");
3496 os::closedir(dir);
3497 return JNI_ERR;
3498 }
3499
3500 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3501 dir = os::opendir(path);
3502 if (dir != NULL) {
3503 jio_fprintf(defaultStream::output_stream(),
3504 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3505 "Use -classpath instead.\n.");
3506 os::closedir(dir);
3507 return JNI_ERR;
3508 }
3509
3510 if (scp_assembly_required) {
3511 // Assemble the bootclasspath elements into the final path.
3512 Arguments::set_sysclasspath(scp_p->combined_path());
3513 }
3514
3515 // This must be done after all arguments have been processed.
3516 // java_compiler() true means set to "NONE" or empty.
3517 if (java_compiler() && !xdebug_mode()) {
3518 // For backwards compatibility, we switch to interpreted mode if
3519 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3520 // not specified.
3521 set_mode_flags(_int);
3522 }
3523
3524 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3525 // but like -Xint, leave compilation thresholds unaffected.
3526 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3527 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3528 set_mode_flags(_int);
3529 }
3530
3531 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3532 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3533 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3534 }
3535
3536 #ifndef COMPILER2
3537 // Don't degrade server performance for footprint
3538 if (FLAG_IS_DEFAULT(UseLargePages) &&
3539 MaxHeapSize < LargePageHeapSizeThreshold) {
3540 // No need for large granularity pages w/small heaps.
3541 // Note that large pages are enabled/disabled for both the
3542 // Java heap and the code cache.
3543 FLAG_SET_DEFAULT(UseLargePages, false);
3544 }
3545
3546 #else
3547 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3548 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3549 }
3550 #endif
3551
3552 #ifndef TIERED
3553 // Tiered compilation is undefined.
3554 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3555 #endif
3556
3557 // If we are running in a headless jre, force java.awt.headless property
3558 // to be true unless the property has already been set.
3559 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3560 if (os::is_headless_jre()) {
3561 const char* headless = Arguments::get_property("java.awt.headless");
3562 if (headless == NULL) {
3563 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3564 if (headless_env == NULL) {
3565 if (!add_property("java.awt.headless=true")) {
3566 return JNI_ENOMEM;
3567 }
3568 } else {
3569 char buffer[256];
3570 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3571 if (!add_property(buffer)) {
3572 return JNI_ENOMEM;
3573 }
3574 }
3575 }
3576 }
3577
3578 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3579 // CMS can only be used with ParNew
3580 FLAG_SET_ERGO(bool, UseParNewGC, true);
3581 }
3582
3583 if (!check_vm_args_consistency()) {
3584 return JNI_ERR;
3585 }
3586
3587 return JNI_OK;
3588 }
3589
3590 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3591 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3592 scp_assembly_required_p);
3593 }
3594
3595 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3596 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3597 scp_assembly_required_p);
3598 }
3599
3600 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3601 char *buffer = ::getenv(name);
3602
3603 // Don't check this variable if user has special privileges
3604 // (e.g. unix su command).
3605 if (buffer == NULL || os::have_special_privileges()) {
3606 return JNI_OK;
3607 }
3608
3609 if ((buffer = os::strdup(buffer)) == NULL) {
3610 return JNI_ENOMEM;
3611 }
3612
3613 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3614 jio_fprintf(defaultStream::error_stream(),
3615 "Picked up %s: %s\n", name, buffer);
3616 char* rd = buffer; // pointer to the input string (rd)
3617 while (true) { // repeat for all options in the input string
3618 while (isspace(*rd)) rd++; // skip whitespace
3619 if (*rd == 0) break; // we re done when the input string is read completely
3620
3621 // The output, option string, overwrites the input string.
3622 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3623 // input string (rd).
3624 char* wrt = rd;
3625
3626 JavaVMOption option;
3627 option.optionString = wrt;
3628 options->append(option); // Fill in option
3629 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3630 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3631 int quote = *rd; // matching quote to look for
3632 rd++; // don't copy open quote
3633 while (*rd != quote) { // include everything (even spaces) up until quote
3634 if (*rd == 0) { // string termination means unmatched string
3635 jio_fprintf(defaultStream::error_stream(),
3636 "Unmatched quote in %s\n", name);
3637 delete options;
3638 os::free(buffer);
3639 return JNI_ERR;
3640 }
3641 *wrt++ = *rd++; // copy to option string
3642 }
3643 rd++; // don't copy close quote
3644 } else {
3645 *wrt++ = *rd++; // copy to option string
3646 }
3647 }
3648 // Need to check if we're done before writing a NULL,
3649 // because the write could be to the byte that rd is pointing to.
3650 if (*rd++ == 0) {
3651 *wrt = 0;
3652 break;
3653 }
3654 *wrt = 0; // Zero terminate option
3655 }
3656 JavaVMOption* options_arr =
3657 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3658 if (options_arr == NULL) {
3659 delete options;
3660 os::free(buffer);
3661 return JNI_ENOMEM;
3662 }
3663 for (int i = 0; i < options->length(); i++) {
3664 options_arr[i] = options->at(i);
3665 }
3666
3667 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3668 JavaVMInitArgs vm_args;
3669 vm_args.version = JNI_VERSION_1_2;
3670 vm_args.options = options_arr;
3671 vm_args.nOptions = options->length();
3672 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3673
3674 if (PrintVMOptions) {
3675 const char* tail;
3676 for (int i = 0; i < vm_args.nOptions; i++) {
3677 const JavaVMOption *option = vm_args.options + i;
3678 if (match_option(option, "-XX:", &tail)) {
3679 logOption(tail);
3680 }
3681 }
3682 }
3683
3684 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3685 Flag::ENVIRON_VAR);
3686 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3687 delete options;
3688 os::free(buffer);
3689 return result;
3690 }
3691
3692 void Arguments::set_shared_spaces_flags() {
3693 if (DumpSharedSpaces) {
3694 if (RequireSharedSpaces) {
3695 warning("cannot dump shared archive while using shared archive");
3696 }
3697 UseSharedSpaces = false;
3698 #ifdef _LP64
3699 if (!UseCompressedOops || !UseCompressedClassPointers) {
3700 vm_exit_during_initialization(
3701 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3702 }
3703 } else {
3704 if (!UseCompressedOops || !UseCompressedClassPointers) {
3705 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3706 }
3707 #endif
3708 }
3709 }
3710
3711 #if !INCLUDE_ALL_GCS
3712 static void force_serial_gc() {
3713 FLAG_SET_DEFAULT(UseSerialGC, true);
3714 UNSUPPORTED_GC_OPTION(UseG1GC);
3715 UNSUPPORTED_GC_OPTION(UseParallelGC);
3716 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3717 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3718 UNSUPPORTED_GC_OPTION(UseParNewGC);
3719 }
3720 #endif // INCLUDE_ALL_GCS
3721
3722 // Sharing support
3723 // Construct the path to the archive
3724 static char* get_shared_archive_path() {
3725 char *shared_archive_path;
3726 if (SharedArchiveFile == NULL) {
3727 char jvm_path[JVM_MAXPATHLEN];
3728 os::jvm_path(jvm_path, sizeof(jvm_path));
3729 char *end = strrchr(jvm_path, *os::file_separator());
3730 if (end != NULL) *end = '\0';
3731 size_t jvm_path_len = strlen(jvm_path);
3732 size_t file_sep_len = strlen(os::file_separator());
3733 const size_t len = jvm_path_len + file_sep_len + 20;
3734 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3735 if (shared_archive_path != NULL) {
3736 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3737 jvm_path, os::file_separator());
3738 }
3739 } else {
3740 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3741 }
3742 return shared_archive_path;
3743 }
3744
3745 #ifndef PRODUCT
3746 // Determine whether LogVMOutput should be implicitly turned on.
3747 static bool use_vm_log() {
3748 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3749 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3750 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3751 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3752 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3753 return true;
3754 }
3755
3756 #ifdef COMPILER1
3757 if (PrintC1Statistics) {
3758 return true;
3759 }
3760 #endif // COMPILER1
3761
3762 #ifdef COMPILER2
3763 if (PrintOptoAssembly || PrintOptoStatistics) {
3764 return true;
3765 }
3766 #endif // COMPILER2
3767
3768 return false;
3769 }
3770 #endif // PRODUCT
3771
3772 jint Arguments::alloc_JVM_options_list(const int needed_slots,
3773 const int version,
3774 struct JavaVMInitArgs **ret_args_head) {
3775 assert(needed_slots > 0, "needed_slots must greater than zero");
3776 assert(ret_args_head != NULL, "ret_args_head must not be NULL");
3777
3778 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3779 "Allocating %d option slots\n", needed_slots));
3780 JavaVMInitArgs *new_args_head =
3781 (JavaVMInitArgs *) os::malloc(sizeof (JavaVMInitArgs), mtInternal);
3782 if (new_args_head == NULL) {
3783 jio_fprintf(defaultStream::error_stream(),
3784 "Could not allocate arguments list head\n");
3785 return JNI_ENOMEM;
3786 }
3787
3788 memset(new_args_head, 0, sizeof (struct JavaVMInitArgs));
3789
3790 int bytes_needed = needed_slots * (sizeof (struct JavaVMOption));
3791 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3792 "to allocate options list %d %d\n",
3793 needed_slots, bytes_needed));
3794
3795 JavaVMOption *new_options_head =
3796 (struct JavaVMOption *) os::malloc(bytes_needed, mtInternal);
3797
3798 if (new_options_head == NULL) {
3799 jio_fprintf(defaultStream::error_stream(),
3800 "Could not allocate options list with %d entries"
3801 " and %d bytes\n",
3802 needed_slots, bytes_needed);
3803
3804 os::free(new_args_head);
3805 new_args_head = NULL;
3806
3807 return JNI_ENOMEM;
3808 }
3809
3810 memset(new_options_head, 0, bytes_needed);
3811
3812 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3813 "allocation need for options list %d %d\n",
3814 needed_slots, bytes_needed));
3815
3816 // Assemble the args object
3817 new_args_head->options = new_options_head;
3818 new_args_head->nOptions = 0;
3819 new_args_head->version = version;
3820
3821 // Return newly allocated but not populated options list
3822 *ret_args_head = new_args_head;
3823
3824 return JNI_OK;
3825 }
3826
3827 // Copy num_slots NULL separated JVM options from buffer to
3828 // new_options[0] through new_options[num_slots - 1].
3829 // The byte_cnt includes null termination.
3830 jint Arguments::copy_JVM_options_from_buf(const char *buffer,
3831 const size_t byte_cnt,
3832 const int num_slots,
3833 int *cur_slot_p,
3834 struct JavaVMOption *new_options) {
3835
3836 assert(buffer != NULL, "buffer must not be NULL");
3837 assert(byte_cnt > 1, "byte_cnt must be greater than one");
3838 assert(num_slots > 0, "num_slots must be greater than zero");
3839 assert(cur_slot_p != NULL, "cur_slot_p must not be NULL");
3840 assert(new_options != NULL, "new_options must not be NULL");
3841
3842 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3843 "Copying %d options from buffer\n",
3844 num_slots));
3845 (*cur_slot_p) = 0;
3846 const char *head = buffer;
3847 const char *tail = buffer + byte_cnt - 1;
3848
3849 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3850 "Copying option %d %d %d\n",
3851 byte_cnt, *cur_slot_p, num_slots));
3852
3853 while ((head < tail) && (*cur_slot_p < num_slots)) {
3854 // Skip null character separator(s)
3855 while ((head < tail) && (*head == '\0')) {
3856 head++;
3857 }
3858
3859 if (head >= tail) {
3860 break;
3861 }
3862
3863 // save a copy of the string in the options list
3864 new_options[(*cur_slot_p)].optionString =
3865 os::strdup_check_oom(head, mtInternal);
3866
3867 if (new_options[(*cur_slot_p)].optionString == NULL) {
3868 jio_fprintf(defaultStream::error_stream(),
3869 "Could not copy file option string '%s'\n", head);
3870 return JNI_ENOMEM;
3871 }
3872
3873 DumpOption(new_options, *cur_slot_p, "copy");
3874 const char *dummy;
3875 if (match_option(&new_options[(*cur_slot_p)],
3876 "-XX:VMOptionsFile=", &dummy)) {
3877 jio_fprintf(defaultStream::error_stream(),
3878 "VM options file is only supported on the command line\n");
3879
3880 (*cur_slot_p)++; // We do not need this slot, but count it on the
3881 // list so the error handling can clean this up
3882 return JNI_EINVAL;
3883 }
3884
3885 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3886 "Copying option %d %d %s\n",
3887 *cur_slot_p,
3888 num_slots,
3889 new_options[(*cur_slot_p)].optionString));
3890 (*cur_slot_p)++; // Done with current slot
3891
3892 while ((head < tail) && (*head != '\0')) {
3893 head++;
3894 }
3895 }
3896
3897 return JNI_OK;
3898 }
3899
3900 // Parse the JVM options from file_name into ret_buff. The
3901 // options in ret_buff are NULL separated in order to preserve
3902 // any embedded white space that was quoted in file_name.
3903 jint Arguments::parse_JVM_options_file(const char *file_name,
3904 char **ret_buff,
3905 size_t *ret_bytes,
3906 int *ret_opt_cnt) {
3907
3908 assert(file_name != NULL, "file_name must not be NULL.");
3909 assert(ret_buff != NULL, "ret_buff must not be NULL.");
3910 assert(ret_bytes != NULL, "ret_bytes must not be NULL.");
3911 assert(ret_opt_cnt != NULL, "ret_opt_cnt must not be NULL.");
3912
3913 // Default all return params to not return data
3914 *ret_buff = NULL;
3915 *ret_bytes = 0;
3916 *ret_opt_cnt = 0;
3917
3918 int fd = ::open(file_name, O_RDONLY);
3919 if (fd < 0) {
3920 jio_fprintf(defaultStream::error_stream(),
3921 "Could not open options file '%s'\n",
3922 file_name);
3923 return JNI_ERR;
3924 }
3925
3926 // '+ 1' for NULL termination even with max bytes
3927 int bytes_alloc = OPTION_BUFFER_SIZE + 1;
3928
3929 char *buf = (char *)os::malloc(bytes_alloc, mtInternal);
3930
3931 if (buf == NULL) {
3932 jio_fprintf(defaultStream::error_stream(),
3933 "Could not allocate read buffer for options file parse\n");
3934 os::close(fd);
3935 return JNI_ENOMEM;
3936 }
3937
3938 memset(buf, 0, (unsigned)bytes_alloc);
3939
3940 // Fill buffer
3941 // Use ::read() instead of os::read because os::read()
3942 // might do a thead state transition
3943 // and it is too early for that here
3944
3945 int bytes_read = ::read(fd, (void *)buf,
3946 (unsigned)bytes_alloc);
3947 if (bytes_read < 0) {
3948 os::free(buf);
3949 buf = NULL;
3950 os::close(fd);
3951 jio_fprintf(defaultStream::error_stream(),
3952 "Could not read options file '%s'\n", file_name);
3953 return JNI_ERR;
3954 }
3955
3956 if (bytes_read == 0) {
3957 // tell caller there is no option data and that is ok
3958 os::free(buf);
3959 buf = NULL;
3960 os::close(fd);
3961 return JNI_OK;
3962 }
3963
3964 // file is larger than OPTION_BUFFER_SIZE
3965 if (bytes_read > bytes_alloc - 1) {
3966 os::free(buf);
3967 buf = NULL;
3968 os::close(fd);
3969 jio_fprintf(defaultStream::error_stream(),
3970 "Options file '%s' is larger than %d bytes.\n",
3971 file_name, bytes_alloc - 1);
3972 return JNI_EINVAL;
3973 }
3974
3975 os::close(fd);
3976
3977 // some pointers to help with parsing
3978 char *buf_end = buf + bytes_read;
3979 char *cur_token_head = buf;
3980 char *wrt = buf;
3981 char *rd = buf;
3982
3983 // count tokens
3984 int token_cnt = 0;
3985
3986 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3987 "Parse buf loop > '%s'\n",
3988 buf));
3989 // parse all options
3990 while (rd < buf_end) {
3991 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3992 "Parse buf loop white > >%s<\n", rd));
3993 // skip leading white space from the input string
3994 while (rd < buf_end && iswhite(*rd)) {
3995 rd++;
3996 }
3997
3998 if (rd >= buf_end) {
3999 break;
4000 }
4001
4002 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4003 "Parse next token > %s\n", rd));
4004 // Remember this is where we found the head of the token.
4005 cur_token_head = wrt;
4006
4007 // Tokens are strings of non white space characters separated
4008 // by one or more white spaces.
4009 while (rd < buf_end && !iswhite(*rd)) {
4010 if (*rd == '\'' || *rd == '"') { // handle a quoted string
4011 int quote = *rd; // matching quote to look for
4012 rd++; // don't copy open quote
4013 while (rd < buf_end && *rd != quote) {
4014 // include everything (even spaces)
4015 // up until the close quote
4016 *wrt++ = *rd++; // copy to option string
4017 }
4018
4019 if (rd < buf_end) {
4020 rd++; // don't copy close quote
4021 } else {
4022 // did not see closing quote
4023 jio_fprintf(defaultStream::error_stream(),
4024 "Unmatched quote in '%s'\n", file_name);
4025 os::free(buf);
4026 buf = NULL;
4027 return JNI_EINVAL;
4028 }
4029 } else {
4030 *wrt++ = *rd++; // copy to option string
4031 }
4032 }
4033
4034 // steal a white space character and set it to NULL
4035 *wrt++ = '\0';
4036 token_cnt++;
4037 // We now have a complete token
4038 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4039 "Current parsed token > %s\n",
4040 cur_token_head));
4041
4042 rd++; // Advance to next character
4043 }
4044
4045 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4046 "Done parsing tokens > %d\n",
4047 token_cnt));
4048
4049 if (token_cnt > N_MAX_OPTIONS) {
4050 jio_fprintf(defaultStream::error_stream(),
4051 "Options file has more than %d options.\n",
4052 N_MAX_OPTIONS);
4053 os::free(buf);
4054 buf = NULL;
4055 return JNI_EINVAL;
4056 }
4057
4058 // Pass the data the back to the caller
4059 *ret_buff = buf;
4060 *ret_opt_cnt = token_cnt;
4061 *ret_bytes = (size_t)(wrt - buf);
4062
4063 return JNI_OK;
4064 }
4065
4066 // Merge options from a JVM options file with the options provided
4067 // by argsin and return the merge results via *argsout. If the
4068 // '-XX:VMOptionsFile=...' option is not specified on the command
4069 // line, then there is nothing to merge and *argsout is set to NULL.
4070 jint Arguments::merge_JVM_options_file(const JavaVMInitArgs *argsin,
4071 JavaVMInitArgs **argsout) {
4072
4073 assert(argsin != NULL, "argsin should not be NULL");
4074 assert(argsout != NULL, "argsout should not be NULL");
4075
4076 JavaVMInitArgs *new_args_head = NULL;
4077 char *options_file = NULL;
4078 bool options_file_found = false;
4079
4080 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4081 "Found %d existing option(s)\n",
4082 argsin->nOptions));
4083
4084 // Take a peak at options passed in, looking for an options file
4085 int old_index = 0;
4086 const char *tail = NULL;
4087 while (old_index < argsin->nOptions) {
4088 JavaVMOption *option = argsin->options + old_index;
4089
4090 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4091 "Found existing option %s\n",
4092 option->optionString));
4093
4094 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4095 // Only one options file allowed on the command line.
4096 if (options_file_found) {
4097 jio_fprintf(defaultStream::error_stream(),
4098 "Only one VM Options file is supported "
4099 "on the command line\n");
4100
4101 *argsout = NULL;
4102 os::free(options_file);
4103 options_file = NULL;
4104 return JNI_EINVAL;
4105 } else {
4106 options_file_found = true;
4107 }
4108 options_file = os::strdup_check_oom(tail, mtInternal);
4109 if (options_file == NULL) {
4110 jio_fprintf(defaultStream::error_stream(),
4111 "Could not copy options file path\n");
4112
4113 return JNI_ENOMEM;
4114 }
4115 }
4116 old_index++;
4117 }
4118
4119 // No option file specified so nothing more to do
4120 if (options_file == NULL) {
4121 *argsout = NULL;
4122 return JNI_OK;
4123 }
4124
4125 DumpVMOptions(argsin, "Premerge");
4126
4127 char *buff; // Contents of the options file
4128 size_t byte_cnt = 0; // bytes in buffer
4129 int file_slots = 0; // # options found in file
4130
4131 // We have requested an options file, so we need to read it
4132 // and do a simple white space parse on it.
4133 jint result = parse_JVM_options_file(options_file,
4134 &buff,
4135 &byte_cnt,
4136 &file_slots);
4137 if (result != JNI_OK) {
4138 // the option file processing failed
4139 jio_fprintf(defaultStream::error_stream(),
4140 "Options file '%s', parsing error\n",
4141 options_file);
4142
4143 os::free(options_file);
4144 options_file = NULL;
4145 *argsout = NULL;
4146 return result;
4147 }
4148
4149 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4150 "Found %d bytes and %d options\n",
4151 byte_cnt, file_slots));
4152 // no options but that is ok
4153 if (file_slots == 0) {
4154 os::free(options_file);
4155 options_file = NULL;
4156 *argsout = NULL;
4157 return JNI_OK;
4158 }
4159
4160 // Combine cmd line slot count and the options file slots passed to us
4161 // We need one less because the "-XX:VMOptionsFile" is not included
4162 // in the new list.
4163 int num_slots = argsin->nOptions + file_slots - 1;
4164
4165 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4166 "Allocate option list with %d slots, %d file,"
4167 " %d exist\n",
4168 num_slots, file_slots, argsin->nOptions));
4169
4170 // Allocate a new option list
4171 result = Arguments::alloc_JVM_options_list(num_slots, argsin->version,
4172 &new_args_head);
4173 if (result != JNI_OK) {
4174 // the option file processing failed
4175 jio_fprintf(defaultStream::error_stream(),
4176 "Memory error in options processing\n");
4177 os::free(buff);
4178 buff = NULL;
4179 os::free(options_file);
4180 options_file = NULL;
4181 *argsout = NULL;
4182 return result;
4183 }
4184
4185 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4186 "merge option list > %d %d\n",
4187 argsin->nOptions, num_slots));
4188
4189 old_index = 0;
4190 while ((old_index < argsin->nOptions) &&
4191 (new_args_head->nOptions < num_slots)) {
4192
4193 JavaVMOption *old_option_p = argsin->options + old_index;
4194 JavaVMOption *new_option_p = new_args_head->options +
4195 new_args_head->nOptions;
4196
4197 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4198 "Merge option %s old %d new %d\n",
4199 old_option_p->optionString,
4200 old_index, new_args_head->nOptions));
4201
4202 // Allow the VM option tracing to come on early.
4203 if (match_option(old_option_p, "-XX:+PrintVMOptions")) {
4204 PrintVMOptions = true;
4205 }
4206
4207 if (match_option(old_option_p, "-XX:VMOptionsFile=", &tail)) {
4208 int file_slots_used = 0;
4209 result = Arguments::copy_JVM_options_from_buf(buff,
4210 byte_cnt,
4211 file_slots,
4212 &file_slots_used,
4213 new_option_p);
4214 // Update option count for success and failure.
4215 // The initialized count is required to free the new args object
4216 new_args_head->nOptions += file_slots_used;
4217
4218 if (result != JNI_OK) {
4219 // the option file processing failed
4220 jio_fprintf(defaultStream::error_stream(),
4221 "Options copy error '%s'\n",
4222 options_file);
4223
4224 os::free(buff);
4225 buff = NULL;
4226 os::free(options_file);
4227 options_file = NULL;
4228 FreeVMOptions(&new_args_head, argsin);
4229 *argsout = NULL;
4230 return result;
4231 }
4232
4233 old_index++; // Next slot in the input list
4234
4235 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4236 "old %d new %d file %d\n",
4237 old_index,
4238 new_args_head->nOptions,
4239 file_slots));
4240 } else {
4241 // We only increment the index if the option preexisted.
4242 // The options file copying increments the index too
4243 new_option_p->optionString =
4244 os::strdup_check_oom(old_option_p->optionString, mtInternal);
4245
4246 if (new_option_p->optionString == NULL) {
4247 jio_fprintf(defaultStream::error_stream(),
4248 "Could not allocate command option string '%s'\n",
4249 old_option_p->optionString);
4250
4251 FreeVMOptions(&new_args_head, argsin);
4252 *argsout = NULL;
4253 os::free(buff);
4254 buff = NULL;
4255 os::free(options_file);
4256 options_file = NULL;
4257 return JNI_ENOMEM;
4258 }
4259
4260 new_option_p->extraInfo = NULL;
4261
4262 DumpOption(old_option_p, old_index, "old");
4263 DumpOption(new_option_p, new_args_head->nOptions, "new");
4264
4265 DumpVMOption(new_args_head, new_args_head->nOptions, "new");
4266 DumpVMOption(argsin, old_index, "old");
4267 old_index++; // Next slot in the input list
4268 new_args_head->nOptions++; // Next slot in the new args list
4269 }
4270
4271 }
4272
4273 os::free(buff);
4274 buff = NULL;
4275 os::free(options_file);
4276 options_file = NULL;
4277
4278 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4279 "trace final num ops %d\n",
4280 new_args_head->nOptions));
4281
4282 // We have a list of options that is ready to be returned to the caller.
4283 *argsout = new_args_head;
4284 DumpVMOptions(*argsout, "Postmerge");
4285 return JNI_OK;
4286 }
4287
4288 // Parse entry point called from JNI_CreateJavaVM
4289
4290 jint Arguments::parse(const struct JavaVMInitArgs *argsin) {
4291 const char* hotspotrc = ".hotspotrc";
4292 bool settings_file_specified = false;
4293 bool needs_hotspotrc_warning = false;
4294
4295 // If flag "-XX:Flags=flags-file" is used it will be the
4296 // first option to be processed.
4297 const char* flags_file;
4298 int index;
4299 struct JavaVMInitArgs *args = NULL;
4300
4301 jint result = Arguments::merge_JVM_options_file(argsin, &args);
4302 if (result != JNI_OK) {
4303 // A more specific error message has been printed to the error stream
4304 jio_fprintf(defaultStream::error_stream(),
4305 "Options merge error, VM will exit\n");
4306 vm_exit(1);
4307 }
4308
4309 if (args == NULL) {
4310 args = (JavaVMInitArgs *)argsin;
4311 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4312 "no file options merged\n"));
4313 } else {
4314 JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4315 "file options merged\n"));
4316 }
4317
4318 DumpVMOptions(args, "Final Command Line");
4319 const char* tail = NULL;
4320 for (index = 0; index < args->nOptions; index++) {
4321 const JavaVMOption *option = args->options + index;
4322 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4323 // -XX:VMOptionsFile= can only appear here if the option file
4324 // is empty or if there are no options to process, ignore it.
4325 continue;
4326 }
4327 if (ArgumentsExt::process_options(option)) {
4328 continue;
4329 }
4330 if (match_option(option, "-XX:Flags=", &tail)) {
4331 flags_file = tail;
4332 settings_file_specified = true;
4333 continue;
4334 }
4335 if (match_option(option, "-XX:+PrintVMOptions")) {
4336 PrintVMOptions = true;
4337 continue;
4338 }
4339 if (match_option(option, "-XX:-PrintVMOptions")) {
4340 PrintVMOptions = false;
4341 continue;
4342 }
4343 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4344 IgnoreUnrecognizedVMOptions = true;
4345 continue;
4346 }
4347 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4348 IgnoreUnrecognizedVMOptions = false;
4349 continue;
4350 }
4351 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4352 CommandLineFlags::printFlags(tty, false);
4353 vm_exit(0);
4354 }
4355 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4356 #if INCLUDE_NMT
4357 // The launcher did not setup nmt environment variable properly.
4358 if (!MemTracker::check_launcher_nmt_support(tail)) {
4359 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4360 }
4361
4362 // Verify if nmt option is valid.
4363 if (MemTracker::verify_nmt_option()) {
4364 // Late initialization, still in single-threaded mode.
4365 if (MemTracker::tracking_level() >= NMT_summary) {
4366 MemTracker::init();
4367 }
4368 } else {
4369 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4370 }
4371 continue;
4372 #else
4373 jio_fprintf(defaultStream::error_stream(),
4374 "Native Memory Tracking is not supported in this VM\n");
4375 return JNI_ERR;
4376 #endif
4377 }
4378
4379 #ifndef PRODUCT
4380 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4381 CommandLineFlags::printFlags(tty, true);
4382 vm_exit(0);
4383 }
4384 #endif
4385 }
4386
4387 if (IgnoreUnrecognizedVMOptions) {
4388 // uncast const to modify the flag args->ignoreUnrecognized
4389 *(jboolean*)(&args->ignoreUnrecognized) = true;
4390 }
4391
4392 // Parse specified settings file
4393 if (settings_file_specified) {
4394 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4395 FreeVMOptions(&args, argsin);
4396 return JNI_EINVAL;
4397 }
4398 } else {
4399 #ifdef ASSERT
4400 // Parse default .hotspotrc settings file
4401 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4402 FreeVMOptions(&args, argsin);
4403 return JNI_EINVAL;
4404 }
4405 #else
4406 struct stat buf;
4407 if (os::stat(hotspotrc, &buf) == 0) {
4408 needs_hotspotrc_warning = true;
4409 }
4410 #endif
4411 }
4412
4413 if (PrintVMOptions) {
4414 for (index = 0; index < args->nOptions; index++) {
4415 const JavaVMOption *option = args->options + index;
4416 if (match_option(option, "-XX:", &tail)) {
4417 logOption(tail);
4418 }
4419 }
4420 }
4421
4422 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4423 result = parse_vm_init_args(args);
4424 if (result != JNI_OK) {
4425 FreeVMOptions(&args, argsin);
4426 return result;
4427 }
4428
4429 FreeVMOptions(&args, argsin);
4430
4431 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4432 SharedArchivePath = get_shared_archive_path();
4433 if (SharedArchivePath == NULL) {
4434 return JNI_ENOMEM;
4435 }
4436
4437 // Set up VerifySharedSpaces
4438 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4439 VerifySharedSpaces = true;
4440 }
4441
4442 // Delay warning until here so that we've had a chance to process
4443 // the -XX:-PrintWarnings flag
4444 if (needs_hotspotrc_warning) {
4445 warning("%s file is present but has been ignored. "
4446 "Run with -XX:Flags=%s to load the file.",
4447 hotspotrc, hotspotrc);
4448 }
4449
4450 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4451 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4452 #endif
4453
4454 ArgumentsExt::report_unsupported_options();
4455
4456 #ifndef PRODUCT
4457 if (TraceBytecodesAt != 0) {
4458 TraceBytecodes = true;
4459 }
4460 if (CountCompiledCalls) {
4461 if (UseCounterDecay) {
4462 warning("UseCounterDecay disabled because CountCalls is set");
4463 UseCounterDecay = false;
4464 }
4465 }
4466 #endif // PRODUCT
4467
4468 if (ScavengeRootsInCode == 0) {
4469 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4470 warning("forcing ScavengeRootsInCode non-zero");
4471 }
4472 ScavengeRootsInCode = 1;
4473 }
4474
4475 if (PrintGCDetails) {
4476 // Turn on -verbose:gc options as well
4477 PrintGC = true;
4478 }
4479
4480 // Set object alignment values.
4481 set_object_alignment();
4482
4483 #if !INCLUDE_ALL_GCS
4484 force_serial_gc();
4485 #endif // INCLUDE_ALL_GCS
4486 #if !INCLUDE_CDS
4487 if (DumpSharedSpaces || RequireSharedSpaces) {
4488 jio_fprintf(defaultStream::error_stream(),
4489 "Shared spaces are not supported in this VM\n");
4490 return JNI_ERR;
4491 }
4492 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4493 warning("Shared spaces are not supported in this VM");
4494 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4495 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4496 }
4497 no_shared_spaces("CDS Disabled");
4498 #endif // INCLUDE_CDS
4499
4500 return JNI_OK;
4501 }
4502
4503 jint Arguments::apply_ergo() {
4504
4505 // Set flags based on ergonomics.
4506 set_ergonomics_flags();
4507
4508 set_shared_spaces_flags();
4509
4510 // Check the GC selections again.
4511 if (!check_gc_consistency()) {
4512 return JNI_EINVAL;
4513 }
4514
4515 if (TieredCompilation) {
4516 set_tiered_flags();
4517 } else {
4518 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4519 if (CompilationPolicyChoice >= 2) {
4520 vm_exit_during_initialization(
4521 "Incompatible compilation policy selected", NULL);
4522 }
4523 // Scale CompileThreshold
4524 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4525 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4526 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4527 }
4528 }
4529
4530 #ifdef COMPILER2
4531 #ifndef PRODUCT
4532 if (PrintIdealGraphLevel > 0) {
4533 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4534 }
4535 #endif
4536 #endif
4537
4538 // Set heap size based on available physical memory
4539 set_heap_size();
4540
4541 ArgumentsExt::set_gc_specific_flags();
4542
4543 // Initialize Metaspace flags and alignments
4544 Metaspace::ergo_initialize();
4545
4546 // Set bytecode rewriting flags
4547 set_bytecode_flags();
4548
4549 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4550 set_aggressive_opts_flags();
4551
4552 // Turn off biased locking for locking debug mode flags,
4553 // which are subtly different from each other but neither works with
4554 // biased locking
4555 if (UseHeavyMonitors
4556 #ifdef COMPILER1
4557 || !UseFastLocking
4558 #endif // COMPILER1
4559 ) {
4560 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4561 // flag set to true on command line; warn the user that they
4562 // can't enable biased locking here
4563 warning("Biased Locking is not supported with locking debug flags"
4564 "; ignoring UseBiasedLocking flag." );
4565 }
4566 UseBiasedLocking = false;
4567 }
4568
4569 #ifdef ZERO
4570 // Clear flags not supported on zero.
4571 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4572 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4573 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4574 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4575 #endif // CC_INTERP
4576
4577 #ifdef COMPILER2
4578 if (!EliminateLocks) {
4579 EliminateNestedLocks = false;
4580 }
4581 if (!Inline) {
4582 IncrementalInline = false;
4583 }
4584 #ifndef PRODUCT
4585 if (!IncrementalInline) {
4586 AlwaysIncrementalInline = false;
4587 }
4588 #endif
4589 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4590 // nothing to use the profiling, turn if off
4591 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4592 }
4593 #endif
4594
4595 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4596 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4597 DebugNonSafepoints = true;
4598 }
4599
4600 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4601 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4602 }
4603
4604 #ifndef PRODUCT
4605 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4606 if (use_vm_log()) {
4607 LogVMOutput = true;
4608 }
4609 }
4610 #endif // PRODUCT
4611
4612 if (PrintCommandLineFlags) {
4613 CommandLineFlags::printSetFlags(tty);
4614 }
4615
4616 // Apply CPU specific policy for the BiasedLocking
4617 if (UseBiasedLocking) {
4618 if (!VM_Version::use_biased_locking() &&
4619 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4620 UseBiasedLocking = false;
4621 }
4622 }
4623 #ifdef COMPILER2
4624 if (!UseBiasedLocking || EmitSync != 0) {
4625 UseOptoBiasInlining = false;
4626 }
4627 #endif
4628
4629 return JNI_OK;
4630 }
4631
4632 jint Arguments::adjust_after_os() {
4633 if (UseNUMA) {
4634 if (UseParallelGC || UseParallelOldGC) {
4635 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4636 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4637 }
4638 }
4639 // UseNUMAInterleaving is set to ON for all collectors and
4640 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4641 // such as the parallel collector for Linux and Solaris will
4642 // interleave old gen and survivor spaces on top of NUMA
4643 // allocation policy for the eden space.
4644 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4645 // all platforms and ParallelGC on Windows will interleave all
4646 // of the heap spaces across NUMA nodes.
4647 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4648 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4649 }
4650 }
4651 return JNI_OK;
4652 }
4653
4654 int Arguments::PropertyList_count(SystemProperty* pl) {
4655 int count = 0;
4656 while(pl != NULL) {
4657 count++;
4658 pl = pl->next();
4659 }
4660 return count;
4661 }
4662
4663 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4664 assert(key != NULL, "just checking");
4665 SystemProperty* prop;
4666 for (prop = pl; prop != NULL; prop = prop->next()) {
4667 if (strcmp(key, prop->key()) == 0) return prop->value();
4668 }
4669 return NULL;
4670 }
4671
4672 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4673 int count = 0;
4674 const char* ret_val = NULL;
4675
4676 while(pl != NULL) {
4677 if(count >= index) {
4678 ret_val = pl->key();
4679 break;
4680 }
4681 count++;
4682 pl = pl->next();
4683 }
4684
4685 return ret_val;
4686 }
4687
4688 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4689 int count = 0;
4690 char* ret_val = NULL;
4691
4692 while(pl != NULL) {
4693 if(count >= index) {
4694 ret_val = pl->value();
4695 break;
4696 }
4697 count++;
4698 pl = pl->next();
4699 }
4700
4701 return ret_val;
4702 }
4703
4704 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4705 SystemProperty* p = *plist;
4706 if (p == NULL) {
4707 *plist = new_p;
4708 } else {
4709 while (p->next() != NULL) {
4710 p = p->next();
4711 }
4712 p->set_next(new_p);
4713 }
4714 }
4715
4716 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4717 if (plist == NULL)
4718 return;
4719
4720 SystemProperty* new_p = new SystemProperty(k, v, true);
4721 PropertyList_add(plist, new_p);
4722 }
4723
4724 void Arguments::PropertyList_add(SystemProperty *element) {
4725 PropertyList_add(&_system_properties, element);
4726 }
4727
4728 // This add maintains unique property key in the list.
4729 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4730 if (plist == NULL)
4731 return;
4732
4733 // If property key exist then update with new value.
4734 SystemProperty* prop;
4735 for (prop = *plist; prop != NULL; prop = prop->next()) {
4736 if (strcmp(k, prop->key()) == 0) {
4737 if (append) {
4738 prop->append_value(v);
4739 } else {
4740 prop->set_value(v);
4741 }
4742 return;
4743 }
4744 }
4745
4746 PropertyList_add(plist, k, v);
4747 }
4748
4749 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4750 // Returns true if all of the source pointed by src has been copied over to
4751 // the destination buffer pointed by buf. Otherwise, returns false.
4752 // Notes:
4753 // 1. If the length (buflen) of the destination buffer excluding the
4754 // NULL terminator character is not long enough for holding the expanded
4755 // pid characters, it also returns false instead of returning the partially
4756 // expanded one.
4757 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4758 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4759 char* buf, size_t buflen) {
4760 const char* p = src;
4761 char* b = buf;
4762 const char* src_end = &src[srclen];
4763 char* buf_end = &buf[buflen - 1];
4764
4765 while (p < src_end && b < buf_end) {
4766 if (*p == '%') {
4767 switch (*(++p)) {
4768 case '%': // "%%" ==> "%"
4769 *b++ = *p++;
4770 break;
4771 case 'p': { // "%p" ==> current process id
4772 // buf_end points to the character before the last character so
4773 // that we could write '\0' to the end of the buffer.
4774 size_t buf_sz = buf_end - b + 1;
4775 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4776
4777 // if jio_snprintf fails or the buffer is not long enough to hold
4778 // the expanded pid, returns false.
4779 if (ret < 0 || ret >= (int)buf_sz) {
4780 return false;
4781 } else {
4782 b += ret;
4783 assert(*b == '\0', "fail in copy_expand_pid");
4784 if (p == src_end && b == buf_end + 1) {
4785 // reach the end of the buffer.
4786 return true;
4787 }
4788 }
4789 p++;
4790 break;
4791 }
4792 default :
4793 *b++ = '%';
4794 }
4795 } else {
4796 *b++ = *p++;
4797 }
4798 }
4799 *b = '\0';
4800 return (p == src_end); // return false if not all of the source was copied
4801 }