Wed, 27 Aug 2014 17:37:18 +0200
8055946: assert(result == NULL || result->is_oop()) failed: must be oop
Summary: caller of popped frame doesn't have valid result during deoptimization
Reviewed-by: kvn
1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #ifdef TARGET_OS_FAMILY_linux
48 # include "os_linux.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_solaris
51 # include "os_solaris.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_windows
54 # include "os_windows.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_aix
57 # include "os_aix.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_bsd
60 # include "os_bsd.inline.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
66 #endif // INCLUDE_ALL_GCS
68 // Note: This is a special bug reporting site for the JVM
69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
70 #define DEFAULT_JAVA_LAUNCHER "generic"
72 // Disable options not supported in this release, with a warning if they
73 // were explicitly requested on the command-line
74 #define UNSUPPORTED_OPTION(opt, description) \
75 do { \
76 if (opt) { \
77 if (FLAG_IS_CMDLINE(opt)) { \
78 warning(description " is disabled in this release."); \
79 } \
80 FLAG_SET_DEFAULT(opt, false); \
81 } \
82 } while(0)
84 #define UNSUPPORTED_GC_OPTION(gc) \
85 do { \
86 if (gc) { \
87 if (FLAG_IS_CMDLINE(gc)) { \
88 warning(#gc " is not supported in this VM. Using Serial GC."); \
89 } \
90 FLAG_SET_DEFAULT(gc, false); \
91 } \
92 } while(0)
94 char** Arguments::_jvm_flags_array = NULL;
95 int Arguments::_num_jvm_flags = 0;
96 char** Arguments::_jvm_args_array = NULL;
97 int Arguments::_num_jvm_args = 0;
98 char* Arguments::_java_command = NULL;
99 SystemProperty* Arguments::_system_properties = NULL;
100 const char* Arguments::_gc_log_filename = NULL;
101 bool Arguments::_has_profile = false;
102 size_t Arguments::_conservative_max_heap_alignment = 0;
103 uintx Arguments::_min_heap_size = 0;
104 uintx Arguments::_min_heap_free_ratio = 0;
105 uintx Arguments::_max_heap_free_ratio = 0;
106 Arguments::Mode Arguments::_mode = _mixed;
107 bool Arguments::_java_compiler = false;
108 bool Arguments::_xdebug_mode = false;
109 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
110 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
111 int Arguments::_sun_java_launcher_pid = -1;
112 bool Arguments::_created_by_gamma_launcher = false;
114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
115 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
116 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
117 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
118 bool Arguments::_ClipInlining = ClipInlining;
120 char* Arguments::SharedArchivePath = NULL;
122 AgentLibraryList Arguments::_libraryList;
123 AgentLibraryList Arguments::_agentList;
125 abort_hook_t Arguments::_abort_hook = NULL;
126 exit_hook_t Arguments::_exit_hook = NULL;
127 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
130 SystemProperty *Arguments::_java_ext_dirs = NULL;
131 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
132 SystemProperty *Arguments::_sun_boot_library_path = NULL;
133 SystemProperty *Arguments::_java_library_path = NULL;
134 SystemProperty *Arguments::_java_home = NULL;
135 SystemProperty *Arguments::_java_class_path = NULL;
136 SystemProperty *Arguments::_sun_boot_class_path = NULL;
138 char* Arguments::_meta_index_path = NULL;
139 char* Arguments::_meta_index_dir = NULL;
141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
143 static bool match_option(const JavaVMOption *option, const char* name,
144 const char** tail) {
145 int len = (int)strlen(name);
146 if (strncmp(option->optionString, name, len) == 0) {
147 *tail = option->optionString + len;
148 return true;
149 } else {
150 return false;
151 }
152 }
154 static void logOption(const char* opt) {
155 if (PrintVMOptions) {
156 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
157 }
158 }
160 // Process java launcher properties.
161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
162 // See if sun.java.launcher or sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
174 _sun_java_launcher_pid = atoi(tail);
175 continue;
176 }
177 }
178 }
180 // Initialize system properties key and value.
181 void Arguments::init_system_properties() {
183 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
184 "Java Virtual Machine Specification", false));
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
189 // following are JVMTI agent writeable properties.
190 // Properties values are set to NULL and they are
191 // os specific they are initialized in os::init_system_properties_values().
192 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
193 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
194 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
195 _java_library_path = new SystemProperty("java.library.path", NULL, true);
196 _java_home = new SystemProperty("java.home", NULL, true);
197 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
199 _java_class_path = new SystemProperty("java.class.path", "", true);
201 // Add to System Property list.
202 PropertyList_add(&_system_properties, _java_ext_dirs);
203 PropertyList_add(&_system_properties, _java_endorsed_dirs);
204 PropertyList_add(&_system_properties, _sun_boot_library_path);
205 PropertyList_add(&_system_properties, _java_library_path);
206 PropertyList_add(&_system_properties, _java_home);
207 PropertyList_add(&_system_properties, _java_class_path);
208 PropertyList_add(&_system_properties, _sun_boot_class_path);
210 // Set OS specific system properties values
211 os::init_system_properties_values();
212 }
215 // Update/Initialize System properties after JDK version number is known
216 void Arguments::init_version_specific_system_properties() {
217 enum { bufsz = 16 };
218 char buffer[bufsz];
219 const char* spec_vendor = "Sun Microsystems Inc.";
220 uint32_t spec_version = 0;
222 if (JDK_Version::is_gte_jdk17x_version()) {
223 spec_vendor = "Oracle Corporation";
224 spec_version = JDK_Version::current().major_version();
225 }
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 */
244 typedef struct {
245 const char* name;
246 JDK_Version obsoleted_in; // when the flag went away
247 JDK_Version accept_until; // which version to start denying the existence
248 } ObsoleteFlag;
250 static ObsoleteFlag obsolete_jvm_flags[] = {
251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
266 { "DefaultInitialRAMFraction",
267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "UseDepthFirstScavengeOrder",
269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
270 { "HandlePromotionFailure",
271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
272 { "MaxLiveObjectEvacuationRatio",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
275 { "UseParallelOldGCCompacting",
276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
277 { "UseParallelDensePrefixUpdate",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelOldGCDensePrefix",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 #ifdef PRODUCT
304 { "DesiredMethodLimit",
305 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
306 #endif // PRODUCT
307 { NULL, JDK_Version(0), JDK_Version(0) }
308 };
310 // Returns true if the flag is obsolete and fits into the range specified
311 // for being ignored. In the case that the flag is ignored, the 'version'
312 // value is filled in with the version number when the flag became
313 // obsolete so that that value can be displayed to the user.
314 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
315 int i = 0;
316 assert(version != NULL, "Must provide a version buffer");
317 while (obsolete_jvm_flags[i].name != NULL) {
318 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
319 // <flag>=xxx form
320 // [-|+]<flag> form
321 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
322 ((s[0] == '+' || s[0] == '-') &&
323 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
324 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
325 *version = flag_status.obsoleted_in;
326 return true;
327 }
328 }
329 i++;
330 }
331 return false;
332 }
334 // Constructs the system class path (aka boot class path) from the following
335 // components, in order:
336 //
337 // prefix // from -Xbootclasspath/p:...
338 // endorsed // the expansion of -Djava.endorsed.dirs=...
339 // base // from os::get_system_properties() or -Xbootclasspath=
340 // suffix // from -Xbootclasspath/a:...
341 //
342 // java.endorsed.dirs is a list of directories; any jar or zip files in the
343 // directories are added to the sysclasspath just before the base.
344 //
345 // This could be AllStatic, but it isn't needed after argument processing is
346 // complete.
347 class SysClassPath: public StackObj {
348 public:
349 SysClassPath(const char* base);
350 ~SysClassPath();
352 inline void set_base(const char* base);
353 inline void add_prefix(const char* prefix);
354 inline void add_suffix_to_prefix(const char* suffix);
355 inline void add_suffix(const char* suffix);
356 inline void reset_path(const char* base);
358 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
359 // property. Must be called after all command-line arguments have been
360 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
361 // combined_path().
362 void expand_endorsed();
364 inline const char* get_base() const { return _items[_scp_base]; }
365 inline const char* get_prefix() const { return _items[_scp_prefix]; }
366 inline const char* get_suffix() const { return _items[_scp_suffix]; }
367 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
369 // Combine all the components into a single c-heap-allocated string; caller
370 // must free the string if/when no longer needed.
371 char* combined_path();
373 private:
374 // Utility routines.
375 static char* add_to_path(const char* path, const char* str, bool prepend);
376 static char* add_jars_to_path(char* path, const char* directory);
378 inline void reset_item_at(int index);
380 // Array indices for the items that make up the sysclasspath. All except the
381 // base are allocated in the C heap and freed by this class.
382 enum {
383 _scp_prefix, // from -Xbootclasspath/p:...
384 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
385 _scp_base, // the default sysclasspath
386 _scp_suffix, // from -Xbootclasspath/a:...
387 _scp_nitems // the number of items, must be last.
388 };
390 const char* _items[_scp_nitems];
391 DEBUG_ONLY(bool _expansion_done;)
392 };
394 SysClassPath::SysClassPath(const char* base) {
395 memset(_items, 0, sizeof(_items));
396 _items[_scp_base] = base;
397 DEBUG_ONLY(_expansion_done = false;)
398 }
400 SysClassPath::~SysClassPath() {
401 // Free everything except the base.
402 for (int i = 0; i < _scp_nitems; ++i) {
403 if (i != _scp_base) reset_item_at(i);
404 }
405 DEBUG_ONLY(_expansion_done = false;)
406 }
408 inline void SysClassPath::set_base(const char* base) {
409 _items[_scp_base] = base;
410 }
412 inline void SysClassPath::add_prefix(const char* prefix) {
413 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
414 }
416 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
417 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
418 }
420 inline void SysClassPath::add_suffix(const char* suffix) {
421 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
422 }
424 inline void SysClassPath::reset_item_at(int index) {
425 assert(index < _scp_nitems && index != _scp_base, "just checking");
426 if (_items[index] != NULL) {
427 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
428 _items[index] = NULL;
429 }
430 }
432 inline void SysClassPath::reset_path(const char* base) {
433 // Clear the prefix and suffix.
434 reset_item_at(_scp_prefix);
435 reset_item_at(_scp_suffix);
436 set_base(base);
437 }
439 //------------------------------------------------------------------------------
441 void SysClassPath::expand_endorsed() {
442 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
444 const char* path = Arguments::get_property("java.endorsed.dirs");
445 if (path == NULL) {
446 path = Arguments::get_endorsed_dir();
447 assert(path != NULL, "no default for java.endorsed.dirs");
448 }
450 char* expanded_path = NULL;
451 const char separator = *os::path_separator();
452 const char* const end = path + strlen(path);
453 while (path < end) {
454 const char* tmp_end = strchr(path, separator);
455 if (tmp_end == NULL) {
456 expanded_path = add_jars_to_path(expanded_path, path);
457 path = end;
458 } else {
459 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
460 memcpy(dirpath, path, tmp_end - path);
461 dirpath[tmp_end - path] = '\0';
462 expanded_path = add_jars_to_path(expanded_path, dirpath);
463 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
464 path = tmp_end + 1;
465 }
466 }
467 _items[_scp_endorsed] = expanded_path;
468 DEBUG_ONLY(_expansion_done = true;)
469 }
471 // Combine the bootclasspath elements, some of which may be null, into a single
472 // c-heap-allocated string.
473 char* SysClassPath::combined_path() {
474 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
475 assert(_expansion_done, "must call expand_endorsed() first.");
477 size_t lengths[_scp_nitems];
478 size_t total_len = 0;
480 const char separator = *os::path_separator();
482 // Get the lengths.
483 int i;
484 for (i = 0; i < _scp_nitems; ++i) {
485 if (_items[i] != NULL) {
486 lengths[i] = strlen(_items[i]);
487 // Include space for the separator char (or a NULL for the last item).
488 total_len += lengths[i] + 1;
489 }
490 }
491 assert(total_len > 0, "empty sysclasspath not allowed");
493 // Copy the _items to a single string.
494 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
495 char* cp_tmp = cp;
496 for (i = 0; i < _scp_nitems; ++i) {
497 if (_items[i] != NULL) {
498 memcpy(cp_tmp, _items[i], lengths[i]);
499 cp_tmp += lengths[i];
500 *cp_tmp++ = separator;
501 }
502 }
503 *--cp_tmp = '\0'; // Replace the extra separator.
504 return cp;
505 }
507 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
508 char*
509 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
510 char *cp;
512 assert(str != NULL, "just checking");
513 if (path == NULL) {
514 size_t len = strlen(str) + 1;
515 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
516 memcpy(cp, str, len); // copy the trailing null
517 } else {
518 const char separator = *os::path_separator();
519 size_t old_len = strlen(path);
520 size_t str_len = strlen(str);
521 size_t len = old_len + str_len + 2;
523 if (prepend) {
524 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
525 char* cp_tmp = cp;
526 memcpy(cp_tmp, str, str_len);
527 cp_tmp += str_len;
528 *cp_tmp = separator;
529 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
530 FREE_C_HEAP_ARRAY(char, path, mtInternal);
531 } else {
532 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
533 char* cp_tmp = cp + old_len;
534 *cp_tmp = separator;
535 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
536 }
537 }
538 return cp;
539 }
541 // Scan the directory and append any jar or zip files found to path.
542 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
543 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
544 DIR* dir = os::opendir(directory);
545 if (dir == NULL) return path;
547 char dir_sep[2] = { '\0', '\0' };
548 size_t directory_len = strlen(directory);
549 const char fileSep = *os::file_separator();
550 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
552 /* Scan the directory for jars/zips, appending them to path. */
553 struct dirent *entry;
554 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
555 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
556 const char* name = entry->d_name;
557 const char* ext = name + strlen(name) - 4;
558 bool isJarOrZip = ext > name &&
559 (os::file_name_strcmp(ext, ".jar") == 0 ||
560 os::file_name_strcmp(ext, ".zip") == 0);
561 if (isJarOrZip) {
562 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
563 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
564 path = add_to_path(path, jarpath, false);
565 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
566 }
567 }
568 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
569 os::closedir(dir);
570 return path;
571 }
573 // Parses a memory size specification string.
574 static bool atomull(const char *s, julong* result) {
575 julong n = 0;
576 int args_read = sscanf(s, JULONG_FORMAT, &n);
577 if (args_read != 1) {
578 return false;
579 }
580 while (*s != '\0' && isdigit(*s)) {
581 s++;
582 }
583 // 4705540: illegal if more characters are found after the first non-digit
584 if (strlen(s) > 1) {
585 return false;
586 }
587 switch (*s) {
588 case 'T': case 't':
589 *result = n * G * K;
590 // Check for overflow.
591 if (*result/((julong)G * K) != n) return false;
592 return true;
593 case 'G': case 'g':
594 *result = n * G;
595 if (*result/G != n) return false;
596 return true;
597 case 'M': case 'm':
598 *result = n * M;
599 if (*result/M != n) return false;
600 return true;
601 case 'K': case 'k':
602 *result = n * K;
603 if (*result/K != n) return false;
604 return true;
605 case '\0':
606 *result = n;
607 return true;
608 default:
609 return false;
610 }
611 }
613 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
614 if (size < min_size) return arg_too_small;
615 // Check that size will fit in a size_t (only relevant on 32-bit)
616 if (size > max_uintx) return arg_too_big;
617 return arg_in_range;
618 }
620 // Describe an argument out of range error
621 void Arguments::describe_range_error(ArgsRange errcode) {
622 switch(errcode) {
623 case arg_too_big:
624 jio_fprintf(defaultStream::error_stream(),
625 "The specified size exceeds the maximum "
626 "representable size.\n");
627 break;
628 case arg_too_small:
629 case arg_unreadable:
630 case arg_in_range:
631 // do nothing for now
632 break;
633 default:
634 ShouldNotReachHere();
635 }
636 }
638 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
639 return CommandLineFlags::boolAtPut(name, &value, origin);
640 }
642 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
643 double v;
644 if (sscanf(value, "%lf", &v) != 1) {
645 return false;
646 }
648 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
649 return true;
650 }
651 return false;
652 }
654 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
655 julong v;
656 intx intx_v;
657 bool is_neg = false;
658 // Check the sign first since atomull() parses only unsigned values.
659 if (*value == '-') {
660 if (!CommandLineFlags::intxAt(name, &intx_v)) {
661 return false;
662 }
663 value++;
664 is_neg = true;
665 }
666 if (!atomull(value, &v)) {
667 return false;
668 }
669 intx_v = (intx) v;
670 if (is_neg) {
671 intx_v = -intx_v;
672 }
673 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
674 return true;
675 }
676 uintx uintx_v = (uintx) v;
677 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
678 return true;
679 }
680 uint64_t uint64_t_v = (uint64_t) v;
681 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
682 return true;
683 }
684 return false;
685 }
687 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
688 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
689 // Contract: CommandLineFlags always returns a pointer that needs freeing.
690 FREE_C_HEAP_ARRAY(char, value, mtInternal);
691 return true;
692 }
694 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
695 const char* old_value = "";
696 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
697 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
698 size_t new_len = strlen(new_value);
699 const char* value;
700 char* free_this_too = NULL;
701 if (old_len == 0) {
702 value = new_value;
703 } else if (new_len == 0) {
704 value = old_value;
705 } else {
706 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
707 // each new setting adds another LINE to the switch:
708 sprintf(buf, "%s\n%s", old_value, new_value);
709 value = buf;
710 free_this_too = buf;
711 }
712 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
713 // CommandLineFlags always returns a pointer that needs freeing.
714 FREE_C_HEAP_ARRAY(char, value, mtInternal);
715 if (free_this_too != NULL) {
716 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
717 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
718 }
719 return true;
720 }
722 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
724 // range of acceptable characters spelled out for portability reasons
725 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
726 #define BUFLEN 255
727 char name[BUFLEN+1];
728 char dummy;
730 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
731 return set_bool_flag(name, false, origin);
732 }
733 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
734 return set_bool_flag(name, true, origin);
735 }
737 char punct;
738 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
739 const char* value = strchr(arg, '=') + 1;
740 Flag* flag = Flag::find_flag(name, strlen(name));
741 if (flag != NULL && flag->is_ccstr()) {
742 if (flag->ccstr_accumulates()) {
743 return append_to_string_flag(name, value, origin);
744 } else {
745 if (value[0] == '\0') {
746 value = NULL;
747 }
748 return set_string_flag(name, value, origin);
749 }
750 }
751 }
753 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
754 const char* value = strchr(arg, '=') + 1;
755 // -XX:Foo:=xxx will reset the string flag to the given value.
756 if (value[0] == '\0') {
757 value = NULL;
758 }
759 return set_string_flag(name, value, origin);
760 }
762 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
763 #define SIGNED_NUMBER_RANGE "[-0123456789]"
764 #define NUMBER_RANGE "[0123456789]"
765 char value[BUFLEN + 1];
766 char value2[BUFLEN + 1];
767 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
768 // Looks like a floating-point number -- try again with more lenient format string
769 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
770 return set_fp_numeric_flag(name, value, origin);
771 }
772 }
774 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
776 return set_numeric_flag(name, value, origin);
777 }
779 return false;
780 }
782 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
783 assert(bldarray != NULL, "illegal argument");
785 if (arg == NULL) {
786 return;
787 }
789 int new_count = *count + 1;
791 // expand the array and add arg to the last element
792 if (*bldarray == NULL) {
793 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
794 } else {
795 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
796 }
797 (*bldarray)[*count] = strdup(arg);
798 *count = new_count;
799 }
801 void Arguments::build_jvm_args(const char* arg) {
802 add_string(&_jvm_args_array, &_num_jvm_args, arg);
803 }
805 void Arguments::build_jvm_flags(const char* arg) {
806 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
807 }
809 // utility function to return a string that concatenates all
810 // strings in a given char** array
811 const char* Arguments::build_resource_string(char** args, int count) {
812 if (args == NULL || count == 0) {
813 return NULL;
814 }
815 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
816 for (int i = 1; i < count; i++) {
817 length += strlen(args[i]) + 1; // add 1 for a space
818 }
819 char* s = NEW_RESOURCE_ARRAY(char, length);
820 strcpy(s, args[0]);
821 for (int j = 1; j < count; j++) {
822 strcat(s, " ");
823 strcat(s, args[j]);
824 }
825 return (const char*) s;
826 }
828 void Arguments::print_on(outputStream* st) {
829 st->print_cr("VM Arguments:");
830 if (num_jvm_flags() > 0) {
831 st->print("jvm_flags: "); print_jvm_flags_on(st);
832 }
833 if (num_jvm_args() > 0) {
834 st->print("jvm_args: "); print_jvm_args_on(st);
835 }
836 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
837 if (_java_class_path != NULL) {
838 char* path = _java_class_path->value();
839 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
840 }
841 st->print_cr("Launcher Type: %s", _sun_java_launcher);
842 }
844 void Arguments::print_jvm_flags_on(outputStream* st) {
845 if (_num_jvm_flags > 0) {
846 for (int i=0; i < _num_jvm_flags; i++) {
847 st->print("%s ", _jvm_flags_array[i]);
848 }
849 st->cr();
850 }
851 }
853 void Arguments::print_jvm_args_on(outputStream* st) {
854 if (_num_jvm_args > 0) {
855 for (int i=0; i < _num_jvm_args; i++) {
856 st->print("%s ", _jvm_args_array[i]);
857 }
858 st->cr();
859 }
860 }
862 bool Arguments::process_argument(const char* arg,
863 jboolean ignore_unrecognized, Flag::Flags origin) {
865 JDK_Version since = JDK_Version();
867 if (parse_argument(arg, origin) || ignore_unrecognized) {
868 return true;
869 }
871 bool has_plus_minus = (*arg == '+' || *arg == '-');
872 const char* const argname = has_plus_minus ? arg + 1 : arg;
873 if (is_newly_obsolete(arg, &since)) {
874 char version[256];
875 since.to_string(version, sizeof(version));
876 warning("ignoring option %s; support was removed in %s", argname, version);
877 return true;
878 }
880 // For locked flags, report a custom error message if available.
881 // Otherwise, report the standard unrecognized VM option.
883 size_t arg_len;
884 const char* equal_sign = strchr(argname, '=');
885 if (equal_sign == NULL) {
886 arg_len = strlen(argname);
887 } else {
888 arg_len = equal_sign - argname;
889 }
891 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
892 if (found_flag != NULL) {
893 char locked_message_buf[BUFLEN];
894 found_flag->get_locked_message(locked_message_buf, BUFLEN);
895 if (strlen(locked_message_buf) == 0) {
896 if (found_flag->is_bool() && !has_plus_minus) {
897 jio_fprintf(defaultStream::error_stream(),
898 "Missing +/- setting for VM option '%s'\n", argname);
899 } else if (!found_flag->is_bool() && has_plus_minus) {
900 jio_fprintf(defaultStream::error_stream(),
901 "Unexpected +/- setting in VM option '%s'\n", argname);
902 } else {
903 jio_fprintf(defaultStream::error_stream(),
904 "Improperly specified VM option '%s'\n", argname);
905 }
906 } else {
907 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
908 }
909 } else {
910 jio_fprintf(defaultStream::error_stream(),
911 "Unrecognized VM option '%s'\n", argname);
912 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
913 if (fuzzy_matched != NULL) {
914 jio_fprintf(defaultStream::error_stream(),
915 "Did you mean '%s%s%s'?\n",
916 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
917 fuzzy_matched->_name,
918 (fuzzy_matched->is_bool()) ? "" : "=<value>");
919 }
920 }
922 // allow for commandline "commenting out" options like -XX:#+Verbose
923 return arg[0] == '#';
924 }
926 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
927 FILE* stream = fopen(file_name, "rb");
928 if (stream == NULL) {
929 if (should_exist) {
930 jio_fprintf(defaultStream::error_stream(),
931 "Could not open settings file %s\n", file_name);
932 return false;
933 } else {
934 return true;
935 }
936 }
938 char token[1024];
939 int pos = 0;
941 bool in_white_space = true;
942 bool in_comment = false;
943 bool in_quote = false;
944 char quote_c = 0;
945 bool result = true;
947 int c = getc(stream);
948 while(c != EOF && pos < (int)(sizeof(token)-1)) {
949 if (in_white_space) {
950 if (in_comment) {
951 if (c == '\n') in_comment = false;
952 } else {
953 if (c == '#') in_comment = true;
954 else if (!isspace(c)) {
955 in_white_space = false;
956 token[pos++] = c;
957 }
958 }
959 } else {
960 if (c == '\n' || (!in_quote && isspace(c))) {
961 // token ends at newline, or at unquoted whitespace
962 // this allows a way to include spaces in string-valued options
963 token[pos] = '\0';
964 logOption(token);
965 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
966 build_jvm_flags(token);
967 pos = 0;
968 in_white_space = true;
969 in_quote = false;
970 } else if (!in_quote && (c == '\'' || c == '"')) {
971 in_quote = true;
972 quote_c = c;
973 } else if (in_quote && (c == quote_c)) {
974 in_quote = false;
975 } else {
976 token[pos++] = c;
977 }
978 }
979 c = getc(stream);
980 }
981 if (pos > 0) {
982 token[pos] = '\0';
983 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
984 build_jvm_flags(token);
985 }
986 fclose(stream);
987 return result;
988 }
990 //=============================================================================================================
991 // Parsing of properties (-D)
993 const char* Arguments::get_property(const char* key) {
994 return PropertyList_get_value(system_properties(), key);
995 }
997 bool Arguments::add_property(const char* prop) {
998 const char* eq = strchr(prop, '=');
999 char* key;
1000 // ns must be static--its address may be stored in a SystemProperty object.
1001 const static char ns[1] = {0};
1002 char* value = (char *)ns;
1004 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1005 key = AllocateHeap(key_len + 1, mtInternal);
1006 strncpy(key, prop, key_len);
1007 key[key_len] = '\0';
1009 if (eq != NULL) {
1010 size_t value_len = strlen(prop) - key_len - 1;
1011 value = AllocateHeap(value_len + 1, mtInternal);
1012 strncpy(value, &prop[key_len + 1], value_len + 1);
1013 }
1015 if (strcmp(key, "java.compiler") == 0) {
1016 process_java_compiler_argument(value);
1017 FreeHeap(key);
1018 if (eq != NULL) {
1019 FreeHeap(value);
1020 }
1021 return true;
1022 } else if (strcmp(key, "sun.java.command") == 0) {
1023 _java_command = value;
1025 // Record value in Arguments, but let it get passed to Java.
1026 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1027 // launcher.pid property is private and is processed
1028 // in process_sun_java_launcher_properties();
1029 // the sun.java.launcher property is passed on to the java application
1030 FreeHeap(key);
1031 if (eq != NULL) {
1032 FreeHeap(value);
1033 }
1034 return true;
1035 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1036 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1037 // its value without going through the property list or making a Java call.
1038 _java_vendor_url_bug = value;
1039 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1040 PropertyList_unique_add(&_system_properties, key, value, true);
1041 return true;
1042 }
1043 // Create new property and add at the end of the list
1044 PropertyList_unique_add(&_system_properties, key, value);
1045 return true;
1046 }
1048 //===========================================================================================================
1049 // Setting int/mixed/comp mode flags
1051 void Arguments::set_mode_flags(Mode mode) {
1052 // Set up default values for all flags.
1053 // If you add a flag to any of the branches below,
1054 // add a default value for it here.
1055 set_java_compiler(false);
1056 _mode = mode;
1058 // Ensure Agent_OnLoad has the correct initial values.
1059 // This may not be the final mode; mode may change later in onload phase.
1060 PropertyList_unique_add(&_system_properties, "java.vm.info",
1061 (char*)VM_Version::vm_info_string(), false);
1063 UseInterpreter = true;
1064 UseCompiler = true;
1065 UseLoopCounter = true;
1067 #ifndef ZERO
1068 // Turn these off for mixed and comp. Leave them on for Zero.
1069 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1070 UseFastAccessorMethods = (mode == _int);
1071 }
1072 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1073 UseFastEmptyMethods = (mode == _int);
1074 }
1075 #endif
1077 // Default values may be platform/compiler dependent -
1078 // use the saved values
1079 ClipInlining = Arguments::_ClipInlining;
1080 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1081 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1082 BackgroundCompilation = Arguments::_BackgroundCompilation;
1084 // Change from defaults based on mode
1085 switch (mode) {
1086 default:
1087 ShouldNotReachHere();
1088 break;
1089 case _int:
1090 UseCompiler = false;
1091 UseLoopCounter = false;
1092 AlwaysCompileLoopMethods = false;
1093 UseOnStackReplacement = false;
1094 break;
1095 case _mixed:
1096 // same as default
1097 break;
1098 case _comp:
1099 UseInterpreter = false;
1100 BackgroundCompilation = false;
1101 ClipInlining = false;
1102 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1103 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1104 // compile a level 4 (C2) and then continue executing it.
1105 if (TieredCompilation) {
1106 Tier3InvokeNotifyFreqLog = 0;
1107 Tier4InvocationThreshold = 0;
1108 }
1109 break;
1110 }
1111 }
1113 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1114 // Conflict: required to use shared spaces (-Xshare:on), but
1115 // incompatible command line options were chosen.
1117 static void no_shared_spaces(const char* message) {
1118 if (RequireSharedSpaces) {
1119 jio_fprintf(defaultStream::error_stream(),
1120 "Class data sharing is inconsistent with other specified options.\n");
1121 vm_exit_during_initialization("Unable to use shared archive.", message);
1122 } else {
1123 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1124 }
1125 }
1126 #endif
1128 void Arguments::set_tiered_flags() {
1129 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1130 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1131 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1132 }
1133 if (CompilationPolicyChoice < 2) {
1134 vm_exit_during_initialization(
1135 "Incompatible compilation policy selected", NULL);
1136 }
1137 // Increase the code cache size - tiered compiles a lot more.
1138 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1139 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1140 }
1141 if (!UseInterpreter) { // -Xcomp
1142 Tier3InvokeNotifyFreqLog = 0;
1143 Tier4InvocationThreshold = 0;
1144 }
1145 }
1147 #if INCLUDE_ALL_GCS
1148 static void disable_adaptive_size_policy(const char* collector_name) {
1149 if (UseAdaptiveSizePolicy) {
1150 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1151 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1152 collector_name);
1153 }
1154 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1155 }
1156 }
1158 void Arguments::set_parnew_gc_flags() {
1159 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1160 "control point invariant");
1161 assert(UseParNewGC, "Error");
1163 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1164 disable_adaptive_size_policy("UseParNewGC");
1166 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1167 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1168 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1169 } else if (ParallelGCThreads == 0) {
1170 jio_fprintf(defaultStream::error_stream(),
1171 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1172 vm_exit(1);
1173 }
1175 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1176 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1177 // we set them to 1024 and 1024.
1178 // See CR 6362902.
1179 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1180 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1181 }
1182 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1183 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1184 }
1186 // AlwaysTenure flag should make ParNew promote all at first collection.
1187 // See CR 6362902.
1188 if (AlwaysTenure) {
1189 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1190 }
1191 // When using compressed oops, we use local overflow stacks,
1192 // rather than using a global overflow list chained through
1193 // the klass word of the object's pre-image.
1194 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1195 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1196 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1197 }
1198 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1199 }
1200 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1201 }
1203 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1204 // sparc/solaris for certain applications, but would gain from
1205 // further optimization and tuning efforts, and would almost
1206 // certainly gain from analysis of platform and environment.
1207 void Arguments::set_cms_and_parnew_gc_flags() {
1208 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1209 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1211 // If we are using CMS, we prefer to UseParNewGC,
1212 // unless explicitly forbidden.
1213 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1214 FLAG_SET_ERGO(bool, UseParNewGC, true);
1215 }
1217 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1218 disable_adaptive_size_policy("UseConcMarkSweepGC");
1220 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1221 // as needed.
1222 if (UseParNewGC) {
1223 set_parnew_gc_flags();
1224 }
1226 size_t max_heap = align_size_down(MaxHeapSize,
1227 CardTableRS::ct_max_alignment_constraint());
1229 // Now make adjustments for CMS
1230 intx tenuring_default = (intx)6;
1231 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1233 // Preferred young gen size for "short" pauses:
1234 // upper bound depends on # of threads and NewRatio.
1235 const uintx parallel_gc_threads =
1236 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1237 const size_t preferred_max_new_size_unaligned =
1238 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1239 size_t preferred_max_new_size =
1240 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1242 // Unless explicitly requested otherwise, size young gen
1243 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1245 // If either MaxNewSize or NewRatio is set on the command line,
1246 // assume the user is trying to set the size of the young gen.
1247 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1249 // Set MaxNewSize to our calculated preferred_max_new_size unless
1250 // NewSize was set on the command line and it is larger than
1251 // preferred_max_new_size.
1252 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1253 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1254 } else {
1255 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1256 }
1257 if (PrintGCDetails && Verbose) {
1258 // Too early to use gclog_or_tty
1259 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1260 }
1262 // Code along this path potentially sets NewSize and OldSize
1263 if (PrintGCDetails && Verbose) {
1264 // Too early to use gclog_or_tty
1265 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1266 " initial_heap_size: " SIZE_FORMAT
1267 " max_heap: " SIZE_FORMAT,
1268 min_heap_size(), InitialHeapSize, max_heap);
1269 }
1270 size_t min_new = preferred_max_new_size;
1271 if (FLAG_IS_CMDLINE(NewSize)) {
1272 min_new = NewSize;
1273 }
1274 if (max_heap > min_new && min_heap_size() > min_new) {
1275 // Unless explicitly requested otherwise, make young gen
1276 // at least min_new, and at most preferred_max_new_size.
1277 if (FLAG_IS_DEFAULT(NewSize)) {
1278 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1279 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1280 if (PrintGCDetails && Verbose) {
1281 // Too early to use gclog_or_tty
1282 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1283 }
1284 }
1285 // Unless explicitly requested otherwise, size old gen
1286 // so it's NewRatio x of NewSize.
1287 if (FLAG_IS_DEFAULT(OldSize)) {
1288 if (max_heap > NewSize) {
1289 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1290 if (PrintGCDetails && Verbose) {
1291 // Too early to use gclog_or_tty
1292 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1293 }
1294 }
1295 }
1296 }
1297 }
1298 // Unless explicitly requested otherwise, definitely
1299 // promote all objects surviving "tenuring_default" scavenges.
1300 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1301 FLAG_IS_DEFAULT(SurvivorRatio)) {
1302 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1303 }
1304 // If we decided above (or user explicitly requested)
1305 // `promote all' (via MaxTenuringThreshold := 0),
1306 // prefer minuscule survivor spaces so as not to waste
1307 // space for (non-existent) survivors
1308 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1309 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1310 }
1311 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1312 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1313 // This is done in order to make ParNew+CMS configuration to work
1314 // with YoungPLABSize and OldPLABSize options.
1315 // See CR 6362902.
1316 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1317 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1318 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1319 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1320 // the value (either from the command line or ergonomics) of
1321 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1322 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1323 } else {
1324 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1325 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1326 // we'll let it to take precedence.
1327 jio_fprintf(defaultStream::error_stream(),
1328 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1329 " options are specified for the CMS collector."
1330 " CMSParPromoteBlocksToClaim will take precedence.\n");
1331 }
1332 }
1333 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1334 // OldPLAB sizing manually turned off: Use a larger default setting,
1335 // unless it was manually specified. This is because a too-low value
1336 // will slow down scavenges.
1337 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1338 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1339 }
1340 }
1341 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1342 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1343 // If either of the static initialization defaults have changed, note this
1344 // modification.
1345 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1346 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1347 }
1348 if (PrintGCDetails && Verbose) {
1349 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1350 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1351 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1352 }
1353 }
1354 #endif // INCLUDE_ALL_GCS
1356 void set_object_alignment() {
1357 // Object alignment.
1358 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1359 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1360 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1361 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1362 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1363 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1365 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1366 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1368 // Oop encoding heap max
1369 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1371 #if INCLUDE_ALL_GCS
1372 // Set CMS global values
1373 CompactibleFreeListSpace::set_cms_values();
1374 #endif // INCLUDE_ALL_GCS
1375 }
1377 bool verify_object_alignment() {
1378 // Object alignment.
1379 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1380 jio_fprintf(defaultStream::error_stream(),
1381 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1382 (int)ObjectAlignmentInBytes);
1383 return false;
1384 }
1385 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1386 jio_fprintf(defaultStream::error_stream(),
1387 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1388 (int)ObjectAlignmentInBytes, BytesPerLong);
1389 return false;
1390 }
1391 // It does not make sense to have big object alignment
1392 // since a space lost due to alignment will be greater
1393 // then a saved space from compressed oops.
1394 if ((int)ObjectAlignmentInBytes > 256) {
1395 jio_fprintf(defaultStream::error_stream(),
1396 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1397 (int)ObjectAlignmentInBytes);
1398 return false;
1399 }
1400 // In case page size is very small.
1401 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1402 jio_fprintf(defaultStream::error_stream(),
1403 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1404 (int)ObjectAlignmentInBytes, os::vm_page_size());
1405 return false;
1406 }
1407 if(SurvivorAlignmentInBytes == 0) {
1408 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1409 } else {
1410 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1411 jio_fprintf(defaultStream::error_stream(),
1412 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1413 (int)SurvivorAlignmentInBytes);
1414 return false;
1415 }
1416 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1417 jio_fprintf(defaultStream::error_stream(),
1418 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1419 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1420 return false;
1421 }
1422 }
1423 return true;
1424 }
1426 size_t Arguments::max_heap_for_compressed_oops() {
1427 // Avoid sign flip.
1428 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1429 // We need to fit both the NULL page and the heap into the memory budget, while
1430 // keeping alignment constraints of the heap. To guarantee the latter, as the
1431 // NULL page is located before the heap, we pad the NULL page to the conservative
1432 // maximum alignment that the GC may ever impose upon the heap.
1433 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1434 _conservative_max_heap_alignment);
1436 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1437 NOT_LP64(ShouldNotReachHere(); return 0);
1438 }
1440 bool Arguments::should_auto_select_low_pause_collector() {
1441 if (UseAutoGCSelectPolicy &&
1442 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1443 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1444 if (PrintGCDetails) {
1445 // Cannot use gclog_or_tty yet.
1446 tty->print_cr("Automatic selection of the low pause collector"
1447 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1448 }
1449 return true;
1450 }
1451 return false;
1452 }
1454 void Arguments::set_use_compressed_oops() {
1455 #ifndef ZERO
1456 #ifdef _LP64
1457 // MaxHeapSize is not set up properly at this point, but
1458 // the only value that can override MaxHeapSize if we are
1459 // to use UseCompressedOops is InitialHeapSize.
1460 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1462 if (max_heap_size <= max_heap_for_compressed_oops()) {
1463 #if !defined(COMPILER1) || defined(TIERED)
1464 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1465 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1466 }
1467 #endif
1468 #ifdef _WIN64
1469 if (UseLargePages && UseCompressedOops) {
1470 // Cannot allocate guard pages for implicit checks in indexed addressing
1471 // mode, when large pages are specified on windows.
1472 // This flag could be switched ON if narrow oop base address is set to 0,
1473 // see code in Universe::initialize_heap().
1474 Universe::set_narrow_oop_use_implicit_null_checks(false);
1475 }
1476 #endif // _WIN64
1477 } else {
1478 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1479 warning("Max heap size too large for Compressed Oops");
1480 FLAG_SET_DEFAULT(UseCompressedOops, false);
1481 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1482 }
1483 }
1484 #endif // _LP64
1485 #endif // ZERO
1486 }
1489 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1490 // set_use_compressed_oops().
1491 void Arguments::set_use_compressed_klass_ptrs() {
1492 #ifndef ZERO
1493 #ifdef _LP64
1494 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1495 if (!UseCompressedOops) {
1496 if (UseCompressedClassPointers) {
1497 warning("UseCompressedClassPointers requires UseCompressedOops");
1498 }
1499 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1500 } else {
1501 // Turn on UseCompressedClassPointers too
1502 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1503 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1504 }
1505 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1506 if (UseCompressedClassPointers) {
1507 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1508 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1509 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1510 }
1511 }
1512 }
1513 #endif // _LP64
1514 #endif // !ZERO
1515 }
1517 void Arguments::set_conservative_max_heap_alignment() {
1518 // The conservative maximum required alignment for the heap is the maximum of
1519 // the alignments imposed by several sources: any requirements from the heap
1520 // itself, the collector policy and the maximum page size we may run the VM
1521 // with.
1522 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1523 #if INCLUDE_ALL_GCS
1524 if (UseParallelGC) {
1525 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1526 } else if (UseG1GC) {
1527 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1528 }
1529 #endif // INCLUDE_ALL_GCS
1530 _conservative_max_heap_alignment = MAX4(heap_alignment,
1531 (size_t)os::vm_allocation_granularity(),
1532 os::max_page_size(),
1533 CollectorPolicy::compute_heap_alignment());
1534 }
1536 void Arguments::select_gc_ergonomically() {
1537 if (os::is_server_class_machine()) {
1538 if (should_auto_select_low_pause_collector()) {
1539 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1540 } else {
1541 FLAG_SET_ERGO(bool, UseParallelGC, true);
1542 }
1543 }
1544 }
1546 void Arguments::select_gc() {
1547 if (!gc_selected()) {
1548 ArgumentsExt::select_gc_ergonomically();
1549 }
1550 }
1552 void Arguments::set_ergonomics_flags() {
1553 select_gc();
1555 #ifdef COMPILER2
1556 // Shared spaces work fine with other GCs but causes bytecode rewriting
1557 // to be disabled, which hurts interpreter performance and decreases
1558 // server performance. When -server is specified, keep the default off
1559 // unless it is asked for. Future work: either add bytecode rewriting
1560 // at link time, or rewrite bytecodes in non-shared methods.
1561 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1562 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1563 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1564 }
1565 #endif
1567 set_conservative_max_heap_alignment();
1569 #ifndef ZERO
1570 #ifdef _LP64
1571 set_use_compressed_oops();
1573 // set_use_compressed_klass_ptrs() must be called after calling
1574 // set_use_compressed_oops().
1575 set_use_compressed_klass_ptrs();
1577 // Also checks that certain machines are slower with compressed oops
1578 // in vm_version initialization code.
1579 #endif // _LP64
1580 #endif // !ZERO
1581 }
1583 void Arguments::set_parallel_gc_flags() {
1584 assert(UseParallelGC || UseParallelOldGC, "Error");
1585 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1586 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1587 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1588 }
1589 FLAG_SET_DEFAULT(UseParallelGC, true);
1591 // If no heap maximum was requested explicitly, use some reasonable fraction
1592 // of the physical memory, up to a maximum of 1GB.
1593 FLAG_SET_DEFAULT(ParallelGCThreads,
1594 Abstract_VM_Version::parallel_worker_threads());
1595 if (ParallelGCThreads == 0) {
1596 jio_fprintf(defaultStream::error_stream(),
1597 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1598 vm_exit(1);
1599 }
1601 if (UseAdaptiveSizePolicy) {
1602 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1603 // unless the user actually sets these flags.
1604 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1605 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1606 _min_heap_free_ratio = MinHeapFreeRatio;
1607 }
1608 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1609 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1610 _max_heap_free_ratio = MaxHeapFreeRatio;
1611 }
1612 }
1614 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1615 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1616 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1617 // See CR 6362902 for details.
1618 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1619 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1620 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1621 }
1622 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1623 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1624 }
1625 }
1627 if (UseParallelOldGC) {
1628 // Par compact uses lower default values since they are treated as
1629 // minimums. These are different defaults because of the different
1630 // interpretation and are not ergonomically set.
1631 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1632 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1633 }
1634 }
1635 }
1637 void Arguments::set_g1_gc_flags() {
1638 assert(UseG1GC, "Error");
1639 #ifdef COMPILER1
1640 FastTLABRefill = false;
1641 #endif
1642 FLAG_SET_DEFAULT(ParallelGCThreads,
1643 Abstract_VM_Version::parallel_worker_threads());
1644 if (ParallelGCThreads == 0) {
1645 FLAG_SET_DEFAULT(ParallelGCThreads,
1646 Abstract_VM_Version::parallel_worker_threads());
1647 }
1649 // MarkStackSize will be set (if it hasn't been set by the user)
1650 // when concurrent marking is initialized.
1651 // Its value will be based upon the number of parallel marking threads.
1652 // But we do set the maximum mark stack size here.
1653 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1654 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1655 }
1657 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1658 // In G1, we want the default GC overhead goal to be higher than
1659 // say in PS. So we set it here to 10%. Otherwise the heap might
1660 // be expanded more aggressively than we would like it to. In
1661 // fact, even 10% seems to not be high enough in some cases
1662 // (especially small GC stress tests that the main thing they do
1663 // is allocation). We might consider increase it further.
1664 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1665 }
1667 if (PrintGCDetails && Verbose) {
1668 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1669 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1670 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1671 }
1672 }
1674 #if !INCLUDE_ALL_GCS
1675 #ifdef ASSERT
1676 static bool verify_serial_gc_flags() {
1677 return (UseSerialGC &&
1678 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1679 UseParallelGC || UseParallelOldGC));
1680 }
1681 #endif // ASSERT
1682 #endif // INCLUDE_ALL_GCS
1684 void Arguments::set_gc_specific_flags() {
1685 #if INCLUDE_ALL_GCS
1686 // Set per-collector flags
1687 if (UseParallelGC || UseParallelOldGC) {
1688 set_parallel_gc_flags();
1689 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1690 set_cms_and_parnew_gc_flags();
1691 } else if (UseParNewGC) { // Skipped if CMS is set above
1692 set_parnew_gc_flags();
1693 } else if (UseG1GC) {
1694 set_g1_gc_flags();
1695 }
1696 check_deprecated_gcs();
1697 check_deprecated_gc_flags();
1698 if (AssumeMP && !UseSerialGC) {
1699 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1700 warning("If the number of processors is expected to increase from one, then"
1701 " you should configure the number of parallel GC threads appropriately"
1702 " using -XX:ParallelGCThreads=N");
1703 }
1704 }
1705 if (MinHeapFreeRatio == 100) {
1706 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1707 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1708 }
1709 #else // INCLUDE_ALL_GCS
1710 assert(verify_serial_gc_flags(), "SerialGC unset");
1711 #endif // INCLUDE_ALL_GCS
1712 }
1714 julong Arguments::limit_by_allocatable_memory(julong limit) {
1715 julong max_allocatable;
1716 julong result = limit;
1717 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1718 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1719 }
1720 return result;
1721 }
1723 void Arguments::set_heap_size() {
1724 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1725 // Deprecated flag
1726 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1727 }
1729 const julong phys_mem =
1730 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1731 : (julong)MaxRAM;
1733 // If the maximum heap size has not been set with -Xmx,
1734 // then set it as fraction of the size of physical memory,
1735 // respecting the maximum and minimum sizes of the heap.
1736 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1737 julong reasonable_max = phys_mem / MaxRAMFraction;
1739 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1740 // Small physical memory, so use a minimum fraction of it for the heap
1741 reasonable_max = phys_mem / MinRAMFraction;
1742 } else {
1743 // Not-small physical memory, so require a heap at least
1744 // as large as MaxHeapSize
1745 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1746 }
1747 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1748 // Limit the heap size to ErgoHeapSizeLimit
1749 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1750 }
1751 if (UseCompressedOops) {
1752 // Limit the heap size to the maximum possible when using compressed oops
1753 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1754 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1755 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1756 // but it should be not less than default MaxHeapSize.
1757 max_coop_heap -= HeapBaseMinAddress;
1758 }
1759 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1760 }
1761 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1763 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1764 // An initial heap size was specified on the command line,
1765 // so be sure that the maximum size is consistent. Done
1766 // after call to limit_by_allocatable_memory because that
1767 // method might reduce the allocation size.
1768 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1769 }
1771 if (PrintGCDetails && Verbose) {
1772 // Cannot use gclog_or_tty yet.
1773 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1774 }
1775 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1776 }
1778 // If the minimum or initial heap_size have not been set or requested to be set
1779 // ergonomically, set them accordingly.
1780 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1781 julong reasonable_minimum = (julong)(OldSize + NewSize);
1783 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1785 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1787 if (InitialHeapSize == 0) {
1788 julong reasonable_initial = phys_mem / InitialRAMFraction;
1790 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1791 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1793 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1795 if (PrintGCDetails && Verbose) {
1796 // Cannot use gclog_or_tty yet.
1797 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1798 }
1799 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1800 }
1801 // If the minimum heap size has not been set (via -Xms),
1802 // synchronize with InitialHeapSize to avoid errors with the default value.
1803 if (min_heap_size() == 0) {
1804 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1805 if (PrintGCDetails && Verbose) {
1806 // Cannot use gclog_or_tty yet.
1807 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1808 }
1809 }
1810 }
1811 }
1813 // This must be called after ergonomics because we want bytecode rewriting
1814 // if the server compiler is used, or if UseSharedSpaces is disabled.
1815 void Arguments::set_bytecode_flags() {
1816 // Better not attempt to store into a read-only space.
1817 if (UseSharedSpaces) {
1818 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1819 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1820 }
1822 if (!RewriteBytecodes) {
1823 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1824 }
1825 }
1827 // Aggressive optimization flags -XX:+AggressiveOpts
1828 void Arguments::set_aggressive_opts_flags() {
1829 #ifdef COMPILER2
1830 if (AggressiveUnboxing) {
1831 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1832 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1833 } else if (!EliminateAutoBox) {
1834 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1835 AggressiveUnboxing = false;
1836 }
1837 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1838 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1839 } else if (!DoEscapeAnalysis) {
1840 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1841 AggressiveUnboxing = false;
1842 }
1843 }
1844 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1845 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1846 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1847 }
1848 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1849 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1850 }
1852 // Feed the cache size setting into the JDK
1853 char buffer[1024];
1854 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1855 add_property(buffer);
1856 }
1857 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1858 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1859 }
1860 #endif
1862 if (AggressiveOpts) {
1863 // Sample flag setting code
1864 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1865 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1866 // }
1867 }
1868 }
1870 //===========================================================================================================
1871 // Parsing of java.compiler property
1873 void Arguments::process_java_compiler_argument(char* arg) {
1874 // For backwards compatibility, Djava.compiler=NONE or ""
1875 // causes us to switch to -Xint mode UNLESS -Xdebug
1876 // is also specified.
1877 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1878 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1879 }
1880 }
1882 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1883 _sun_java_launcher = strdup(launcher);
1884 if (strcmp("gamma", _sun_java_launcher) == 0) {
1885 _created_by_gamma_launcher = true;
1886 }
1887 }
1889 bool Arguments::created_by_java_launcher() {
1890 assert(_sun_java_launcher != NULL, "property must have value");
1891 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1892 }
1894 bool Arguments::created_by_gamma_launcher() {
1895 return _created_by_gamma_launcher;
1896 }
1898 //===========================================================================================================
1899 // Parsing of main arguments
1901 bool Arguments::verify_interval(uintx val, uintx min,
1902 uintx max, const char* name) {
1903 // Returns true iff value is in the inclusive interval [min..max]
1904 // false, otherwise.
1905 if (val >= min && val <= max) {
1906 return true;
1907 }
1908 jio_fprintf(defaultStream::error_stream(),
1909 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1910 " and " UINTX_FORMAT "\n",
1911 name, val, min, max);
1912 return false;
1913 }
1915 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1916 // Returns true if given value is at least specified min threshold
1917 // false, otherwise.
1918 if (val >= min ) {
1919 return true;
1920 }
1921 jio_fprintf(defaultStream::error_stream(),
1922 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1923 name, val, min);
1924 return false;
1925 }
1927 bool Arguments::verify_percentage(uintx value, const char* name) {
1928 if (is_percentage(value)) {
1929 return true;
1930 }
1931 jio_fprintf(defaultStream::error_stream(),
1932 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1933 name, value);
1934 return false;
1935 }
1937 // check if do gclog rotation
1938 // +UseGCLogFileRotation is a must,
1939 // no gc log rotation when log file not supplied or
1940 // NumberOfGCLogFiles is 0
1941 void check_gclog_consistency() {
1942 if (UseGCLogFileRotation) {
1943 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1944 jio_fprintf(defaultStream::output_stream(),
1945 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1946 "where num_of_file > 0\n"
1947 "GC log rotation is turned off\n");
1948 UseGCLogFileRotation = false;
1949 }
1950 }
1952 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1953 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1954 jio_fprintf(defaultStream::output_stream(),
1955 "GCLogFileSize changed to minimum 8K\n");
1956 }
1957 }
1959 // This function is called for -Xloggc:<filename>, it can be used
1960 // to check if a given file name(or string) conforms to the following
1961 // specification:
1962 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1963 // %p and %t only allowed once. We only limit usage of filename not path
1964 bool is_filename_valid(const char *file_name) {
1965 const char* p = file_name;
1966 char file_sep = os::file_separator()[0];
1967 const char* cp;
1968 // skip prefix path
1969 for (cp = file_name; *cp != '\0'; cp++) {
1970 if (*cp == '/' || *cp == file_sep) {
1971 p = cp + 1;
1972 }
1973 }
1975 int count_p = 0;
1976 int count_t = 0;
1977 while (*p != '\0') {
1978 if ((*p >= '0' && *p <= '9') ||
1979 (*p >= 'A' && *p <= 'Z') ||
1980 (*p >= 'a' && *p <= 'z') ||
1981 *p == '-' ||
1982 *p == '_' ||
1983 *p == '.') {
1984 p++;
1985 continue;
1986 }
1987 if (*p == '%') {
1988 if(*(p + 1) == 'p') {
1989 p += 2;
1990 count_p ++;
1991 continue;
1992 }
1993 if (*(p + 1) == 't') {
1994 p += 2;
1995 count_t ++;
1996 continue;
1997 }
1998 }
1999 return false;
2000 }
2001 return count_p < 2 && count_t < 2;
2002 }
2004 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2005 if (!is_percentage(min_heap_free_ratio)) {
2006 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2007 return false;
2008 }
2009 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2010 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2011 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2012 MaxHeapFreeRatio);
2013 return false;
2014 }
2015 // This does not set the flag itself, but stores the value in a safe place for later usage.
2016 _min_heap_free_ratio = min_heap_free_ratio;
2017 return true;
2018 }
2020 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2021 if (!is_percentage(max_heap_free_ratio)) {
2022 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2023 return false;
2024 }
2025 if (max_heap_free_ratio < MinHeapFreeRatio) {
2026 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2027 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2028 MinHeapFreeRatio);
2029 return false;
2030 }
2031 // This does not set the flag itself, but stores the value in a safe place for later usage.
2032 _max_heap_free_ratio = max_heap_free_ratio;
2033 return true;
2034 }
2036 // Check consistency of GC selection
2037 bool Arguments::check_gc_consistency_user() {
2038 check_gclog_consistency();
2039 bool status = true;
2040 // Ensure that the user has not selected conflicting sets
2041 // of collectors. [Note: this check is merely a user convenience;
2042 // collectors over-ride each other so that only a non-conflicting
2043 // set is selected; however what the user gets is not what they
2044 // may have expected from the combination they asked for. It's
2045 // better to reduce user confusion by not allowing them to
2046 // select conflicting combinations.
2047 uint i = 0;
2048 if (UseSerialGC) i++;
2049 if (UseConcMarkSweepGC || UseParNewGC) i++;
2050 if (UseParallelGC || UseParallelOldGC) i++;
2051 if (UseG1GC) i++;
2052 if (i > 1) {
2053 jio_fprintf(defaultStream::error_stream(),
2054 "Conflicting collector combinations in option list; "
2055 "please refer to the release notes for the combinations "
2056 "allowed\n");
2057 status = false;
2058 }
2059 return status;
2060 }
2062 void Arguments::check_deprecated_gcs() {
2063 if (UseConcMarkSweepGC && !UseParNewGC) {
2064 warning("Using the DefNew young collector with the CMS collector is deprecated "
2065 "and will likely be removed in a future release");
2066 }
2068 if (UseParNewGC && !UseConcMarkSweepGC) {
2069 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2070 // set up UseSerialGC properly, so that can't be used in the check here.
2071 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2072 "and will likely be removed in a future release");
2073 }
2075 if (CMSIncrementalMode) {
2076 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2077 }
2078 }
2080 void Arguments::check_deprecated_gc_flags() {
2081 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2082 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2083 "and will likely be removed in future release");
2084 }
2085 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2086 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2087 "Use MaxRAMFraction instead.");
2088 }
2089 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2090 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2091 }
2092 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2093 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2094 }
2095 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2096 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2097 }
2098 }
2100 // Check stack pages settings
2101 bool Arguments::check_stack_pages()
2102 {
2103 bool status = true;
2104 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2105 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2106 // greater stack shadow pages can't generate instruction to bang stack
2107 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2108 return status;
2109 }
2111 // Check the consistency of vm_init_args
2112 bool Arguments::check_vm_args_consistency() {
2113 // Method for adding checks for flag consistency.
2114 // The intent is to warn the user of all possible conflicts,
2115 // before returning an error.
2116 // Note: Needs platform-dependent factoring.
2117 bool status = true;
2119 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2120 // builds so the cost of stack banging can be measured.
2121 #if (defined(PRODUCT) && defined(SOLARIS))
2122 if (!UseBoundThreads && !UseStackBanging) {
2123 jio_fprintf(defaultStream::error_stream(),
2124 "-UseStackBanging conflicts with -UseBoundThreads\n");
2126 status = false;
2127 }
2128 #endif
2130 if (TLABRefillWasteFraction == 0) {
2131 jio_fprintf(defaultStream::error_stream(),
2132 "TLABRefillWasteFraction should be a denominator, "
2133 "not " SIZE_FORMAT "\n",
2134 TLABRefillWasteFraction);
2135 status = false;
2136 }
2138 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2139 "AdaptiveSizePolicyWeight");
2140 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2142 // Divide by bucket size to prevent a large size from causing rollover when
2143 // calculating amount of memory needed to be allocated for the String table.
2144 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2145 (max_uintx / StringTable::bucket_size()), "StringTable size");
2147 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2148 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2150 {
2151 // Using "else if" below to avoid printing two error messages if min > max.
2152 // This will also prevent us from reporting both min>100 and max>100 at the
2153 // same time, but that is less annoying than printing two identical errors IMHO.
2154 FormatBuffer<80> err_msg("%s","");
2155 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2156 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2157 status = false;
2158 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2159 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2160 status = false;
2161 }
2162 }
2164 // Min/MaxMetaspaceFreeRatio
2165 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2166 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2168 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2169 jio_fprintf(defaultStream::error_stream(),
2170 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2171 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2172 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2173 MinMetaspaceFreeRatio,
2174 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2175 MaxMetaspaceFreeRatio);
2176 status = false;
2177 }
2179 // Trying to keep 100% free is not practical
2180 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2182 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2183 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2184 }
2186 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2187 // Settings to encourage splitting.
2188 if (!FLAG_IS_CMDLINE(NewRatio)) {
2189 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2190 }
2191 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2192 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2193 }
2194 }
2196 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2197 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2198 if (GCTimeLimit == 100) {
2199 // Turn off gc-overhead-limit-exceeded checks
2200 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2201 }
2203 status = status && ArgumentsExt::check_gc_consistency_user();
2204 status = status && check_stack_pages();
2206 if (CMSIncrementalMode) {
2207 if (!UseConcMarkSweepGC) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "error: invalid argument combination.\n"
2210 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2211 "selected in order\nto use CMSIncrementalMode.\n");
2212 status = false;
2213 } else {
2214 status = status && verify_percentage(CMSIncrementalDutyCycle,
2215 "CMSIncrementalDutyCycle");
2216 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2217 "CMSIncrementalDutyCycleMin");
2218 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2219 "CMSIncrementalSafetyFactor");
2220 status = status && verify_percentage(CMSIncrementalOffset,
2221 "CMSIncrementalOffset");
2222 status = status && verify_percentage(CMSExpAvgFactor,
2223 "CMSExpAvgFactor");
2224 // If it was not set on the command line, set
2225 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2226 if (CMSInitiatingOccupancyFraction < 0) {
2227 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2228 }
2229 }
2230 }
2232 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2233 // insists that we hold the requisite locks so that the iteration is
2234 // MT-safe. For the verification at start-up and shut-down, we don't
2235 // yet have a good way of acquiring and releasing these locks,
2236 // which are not visible at the CollectedHeap level. We want to
2237 // be able to acquire these locks and then do the iteration rather
2238 // than just disable the lock verification. This will be fixed under
2239 // bug 4788986.
2240 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2241 if (VerifyDuringStartup) {
2242 warning("Heap verification at start-up disabled "
2243 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2244 VerifyDuringStartup = false; // Disable verification at start-up
2245 }
2247 if (VerifyBeforeExit) {
2248 warning("Heap verification at shutdown disabled "
2249 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2250 VerifyBeforeExit = false; // Disable verification at shutdown
2251 }
2252 }
2254 // Note: only executed in non-PRODUCT mode
2255 if (!UseAsyncConcMarkSweepGC &&
2256 (ExplicitGCInvokesConcurrent ||
2257 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2258 jio_fprintf(defaultStream::error_stream(),
2259 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2260 " with -UseAsyncConcMarkSweepGC");
2261 status = false;
2262 }
2264 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2266 #if INCLUDE_ALL_GCS
2267 if (UseG1GC) {
2268 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2269 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2270 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2272 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2273 "InitiatingHeapOccupancyPercent");
2274 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2275 "G1RefProcDrainInterval");
2276 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2277 "G1ConcMarkStepDurationMillis");
2278 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2279 "G1ConcRSHotCardLimit");
2280 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2281 "G1ConcRSLogCacheSize");
2282 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2283 "StringDeduplicationAgeThreshold");
2284 }
2285 if (UseConcMarkSweepGC) {
2286 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2287 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2288 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2289 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2291 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2293 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2294 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2295 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2297 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2299 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2300 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2302 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2303 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2304 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2306 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2308 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2310 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2311 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2312 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2313 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2314 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2315 }
2317 if (UseParallelGC || UseParallelOldGC) {
2318 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2319 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2321 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2322 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2324 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2325 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2327 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2329 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2330 }
2331 #endif // INCLUDE_ALL_GCS
2333 status = status && verify_interval(RefDiscoveryPolicy,
2334 ReferenceProcessor::DiscoveryPolicyMin,
2335 ReferenceProcessor::DiscoveryPolicyMax,
2336 "RefDiscoveryPolicy");
2338 // Limit the lower bound of this flag to 1 as it is used in a division
2339 // expression.
2340 status = status && verify_interval(TLABWasteTargetPercent,
2341 1, 100, "TLABWasteTargetPercent");
2343 status = status && verify_object_alignment();
2345 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2346 "CompressedClassSpaceSize");
2348 status = status && verify_interval(MarkStackSizeMax,
2349 1, (max_jint - 1), "MarkStackSizeMax");
2350 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2352 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2354 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2356 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2358 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2359 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2361 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2363 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2364 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2365 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2366 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2368 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2369 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2371 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2372 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2373 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2375 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2376 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2378 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2379 // just for that, so hardcode here.
2380 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2381 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2382 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2383 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2385 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2387 if (PrintNMTStatistics) {
2388 #if INCLUDE_NMT
2389 if (MemTracker::tracking_level() == NMT_off) {
2390 #endif // INCLUDE_NMT
2391 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2392 PrintNMTStatistics = false;
2393 #if INCLUDE_NMT
2394 }
2395 #endif
2396 }
2398 // Need to limit the extent of the padding to reasonable size.
2399 // 8K is well beyond the reasonable HW cache line size, even with the
2400 // aggressive prefetching, while still leaving the room for segregating
2401 // among the distinct pages.
2402 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2403 jio_fprintf(defaultStream::error_stream(),
2404 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2405 ContendedPaddingWidth, 0, 8192);
2406 status = false;
2407 }
2409 // Need to enforce the padding not to break the existing field alignments.
2410 // It is sufficient to check against the largest type size.
2411 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2412 jio_fprintf(defaultStream::error_stream(),
2413 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2414 ContendedPaddingWidth, BytesPerLong);
2415 status = false;
2416 }
2418 // Check lower bounds of the code cache
2419 // Template Interpreter code is approximately 3X larger in debug builds.
2420 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2421 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2422 jio_fprintf(defaultStream::error_stream(),
2423 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2424 os::vm_page_size()/K);
2425 status = false;
2426 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2427 jio_fprintf(defaultStream::error_stream(),
2428 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2429 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2430 status = false;
2431 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2432 jio_fprintf(defaultStream::error_stream(),
2433 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2434 min_code_cache_size/K);
2435 status = false;
2436 } else if (ReservedCodeCacheSize > 2*G) {
2437 // Code cache size larger than MAXINT is not supported.
2438 jio_fprintf(defaultStream::error_stream(),
2439 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2440 (2*G)/M);
2441 status = false;
2442 }
2444 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2445 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2447 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2448 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2449 }
2451 return status;
2452 }
2454 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2455 const char* option_type) {
2456 if (ignore) return false;
2458 const char* spacer = " ";
2459 if (option_type == NULL) {
2460 option_type = ++spacer; // Set both to the empty string.
2461 }
2463 if (os::obsolete_option(option)) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Obsolete %s%soption: %s\n", option_type, spacer,
2466 option->optionString);
2467 return false;
2468 } else {
2469 jio_fprintf(defaultStream::error_stream(),
2470 "Unrecognized %s%soption: %s\n", option_type, spacer,
2471 option->optionString);
2472 return true;
2473 }
2474 }
2476 static const char* user_assertion_options[] = {
2477 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2478 };
2480 static const char* system_assertion_options[] = {
2481 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2482 };
2484 // Return true if any of the strings in null-terminated array 'names' matches.
2485 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2486 // the option must match exactly.
2487 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2488 bool tail_allowed) {
2489 for (/* empty */; *names != NULL; ++names) {
2490 if (match_option(option, *names, tail)) {
2491 if (**tail == '\0' || tail_allowed && **tail == ':') {
2492 return true;
2493 }
2494 }
2495 }
2496 return false;
2497 }
2499 bool Arguments::parse_uintx(const char* value,
2500 uintx* uintx_arg,
2501 uintx min_size) {
2503 // Check the sign first since atomull() parses only unsigned values.
2504 bool value_is_positive = !(*value == '-');
2506 if (value_is_positive) {
2507 julong n;
2508 bool good_return = atomull(value, &n);
2509 if (good_return) {
2510 bool above_minimum = n >= min_size;
2511 bool value_is_too_large = n > max_uintx;
2513 if (above_minimum && !value_is_too_large) {
2514 *uintx_arg = n;
2515 return true;
2516 }
2517 }
2518 }
2519 return false;
2520 }
2522 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2523 julong* long_arg,
2524 julong min_size) {
2525 if (!atomull(s, long_arg)) return arg_unreadable;
2526 return check_memory_size(*long_arg, min_size);
2527 }
2529 // Parse JavaVMInitArgs structure
2531 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2532 // For components of the system classpath.
2533 SysClassPath scp(Arguments::get_sysclasspath());
2534 bool scp_assembly_required = false;
2536 // Save default settings for some mode flags
2537 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2538 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2539 Arguments::_ClipInlining = ClipInlining;
2540 Arguments::_BackgroundCompilation = BackgroundCompilation;
2542 // Setup flags for mixed which is the default
2543 set_mode_flags(_mixed);
2545 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2546 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2547 if (result != JNI_OK) {
2548 return result;
2549 }
2551 // Parse JavaVMInitArgs structure passed in
2552 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2553 if (result != JNI_OK) {
2554 return result;
2555 }
2557 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2558 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2559 if (result != JNI_OK) {
2560 return result;
2561 }
2563 // Do final processing now that all arguments have been parsed
2564 result = finalize_vm_init_args(&scp, scp_assembly_required);
2565 if (result != JNI_OK) {
2566 return result;
2567 }
2569 return JNI_OK;
2570 }
2572 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2573 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2574 // are dealing with -agentpath (case where name is a path), otherwise with
2575 // -agentlib
2576 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2577 char *_name;
2578 const char *_hprof = "hprof", *_jdwp = "jdwp";
2579 size_t _len_hprof, _len_jdwp, _len_prefix;
2581 if (is_path) {
2582 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2583 return false;
2584 }
2586 _name++; // skip past last path separator
2587 _len_prefix = strlen(JNI_LIB_PREFIX);
2589 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2590 return false;
2591 }
2593 _name += _len_prefix;
2594 _len_hprof = strlen(_hprof);
2595 _len_jdwp = strlen(_jdwp);
2597 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2598 _name += _len_hprof;
2599 }
2600 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2601 _name += _len_jdwp;
2602 }
2603 else {
2604 return false;
2605 }
2607 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2608 return false;
2609 }
2611 return true;
2612 }
2614 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2615 return true;
2616 }
2618 return false;
2619 }
2621 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2622 SysClassPath* scp_p,
2623 bool* scp_assembly_required_p,
2624 Flag::Flags origin) {
2625 // Remaining part of option string
2626 const char* tail;
2628 // iterate over arguments
2629 for (int index = 0; index < args->nOptions; index++) {
2630 bool is_absolute_path = false; // for -agentpath vs -agentlib
2632 const JavaVMOption* option = args->options + index;
2634 if (!match_option(option, "-Djava.class.path", &tail) &&
2635 !match_option(option, "-Dsun.java.command", &tail) &&
2636 !match_option(option, "-Dsun.java.launcher", &tail)) {
2638 // add all jvm options to the jvm_args string. This string
2639 // is used later to set the java.vm.args PerfData string constant.
2640 // the -Djava.class.path and the -Dsun.java.command options are
2641 // omitted from jvm_args string as each have their own PerfData
2642 // string constant object.
2643 build_jvm_args(option->optionString);
2644 }
2646 // -verbose:[class/gc/jni]
2647 if (match_option(option, "-verbose", &tail)) {
2648 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2649 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2650 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2651 } else if (!strcmp(tail, ":gc")) {
2652 FLAG_SET_CMDLINE(bool, PrintGC, true);
2653 } else if (!strcmp(tail, ":jni")) {
2654 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2655 }
2656 // -da / -ea / -disableassertions / -enableassertions
2657 // These accept an optional class/package name separated by a colon, e.g.,
2658 // -da:java.lang.Thread.
2659 } else if (match_option(option, user_assertion_options, &tail, true)) {
2660 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2661 if (*tail == '\0') {
2662 JavaAssertions::setUserClassDefault(enable);
2663 } else {
2664 assert(*tail == ':', "bogus match by match_option()");
2665 JavaAssertions::addOption(tail + 1, enable);
2666 }
2667 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2668 } else if (match_option(option, system_assertion_options, &tail, false)) {
2669 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2670 JavaAssertions::setSystemClassDefault(enable);
2671 // -bootclasspath:
2672 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2673 scp_p->reset_path(tail);
2674 *scp_assembly_required_p = true;
2675 // -bootclasspath/a:
2676 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2677 scp_p->add_suffix(tail);
2678 *scp_assembly_required_p = true;
2679 // -bootclasspath/p:
2680 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2681 scp_p->add_prefix(tail);
2682 *scp_assembly_required_p = true;
2683 // -Xrun
2684 } else if (match_option(option, "-Xrun", &tail)) {
2685 if (tail != NULL) {
2686 const char* pos = strchr(tail, ':');
2687 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2688 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2689 name[len] = '\0';
2691 char *options = NULL;
2692 if(pos != NULL) {
2693 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2694 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2695 }
2696 #if !INCLUDE_JVMTI
2697 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2698 jio_fprintf(defaultStream::error_stream(),
2699 "Profiling and debugging agents are not supported in this VM\n");
2700 return JNI_ERR;
2701 }
2702 #endif // !INCLUDE_JVMTI
2703 add_init_library(name, options);
2704 }
2705 // -agentlib and -agentpath
2706 } else if (match_option(option, "-agentlib:", &tail) ||
2707 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2708 if(tail != NULL) {
2709 const char* pos = strchr(tail, '=');
2710 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2711 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2712 name[len] = '\0';
2714 char *options = NULL;
2715 if(pos != NULL) {
2716 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2717 }
2718 #if !INCLUDE_JVMTI
2719 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2720 jio_fprintf(defaultStream::error_stream(),
2721 "Profiling and debugging agents are not supported in this VM\n");
2722 return JNI_ERR;
2723 }
2724 #endif // !INCLUDE_JVMTI
2725 add_init_agent(name, options, is_absolute_path);
2726 }
2727 // -javaagent
2728 } else if (match_option(option, "-javaagent:", &tail)) {
2729 #if !INCLUDE_JVMTI
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Instrumentation agents are not supported in this VM\n");
2732 return JNI_ERR;
2733 #else
2734 if(tail != NULL) {
2735 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2736 add_init_agent("instrument", options, false);
2737 }
2738 #endif // !INCLUDE_JVMTI
2739 // -Xnoclassgc
2740 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2741 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2742 // -Xincgc: i-CMS
2743 } else if (match_option(option, "-Xincgc", &tail)) {
2744 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2745 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2746 // -Xnoincgc: no i-CMS
2747 } else if (match_option(option, "-Xnoincgc", &tail)) {
2748 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2749 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2750 // -Xconcgc
2751 } else if (match_option(option, "-Xconcgc", &tail)) {
2752 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2753 // -Xnoconcgc
2754 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2755 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2756 // -Xbatch
2757 } else if (match_option(option, "-Xbatch", &tail)) {
2758 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2759 // -Xmn for compatibility with other JVM vendors
2760 } else if (match_option(option, "-Xmn", &tail)) {
2761 julong long_initial_young_size = 0;
2762 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2763 if (errcode != arg_in_range) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "Invalid initial young generation size: %s\n", option->optionString);
2766 describe_range_error(errcode);
2767 return JNI_EINVAL;
2768 }
2769 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2770 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2771 // -Xms
2772 } else if (match_option(option, "-Xms", &tail)) {
2773 julong long_initial_heap_size = 0;
2774 // an initial heap size of 0 means automatically determine
2775 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2776 if (errcode != arg_in_range) {
2777 jio_fprintf(defaultStream::error_stream(),
2778 "Invalid initial heap size: %s\n", option->optionString);
2779 describe_range_error(errcode);
2780 return JNI_EINVAL;
2781 }
2782 set_min_heap_size((uintx)long_initial_heap_size);
2783 // Currently the minimum size and the initial heap sizes are the same.
2784 // Can be overridden with -XX:InitialHeapSize.
2785 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2786 // -Xmx
2787 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2788 julong long_max_heap_size = 0;
2789 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2790 if (errcode != arg_in_range) {
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Invalid maximum heap size: %s\n", option->optionString);
2793 describe_range_error(errcode);
2794 return JNI_EINVAL;
2795 }
2796 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2797 // Xmaxf
2798 } else if (match_option(option, "-Xmaxf", &tail)) {
2799 char* err;
2800 int maxf = (int)(strtod(tail, &err) * 100);
2801 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2802 jio_fprintf(defaultStream::error_stream(),
2803 "Bad max heap free percentage size: %s\n",
2804 option->optionString);
2805 return JNI_EINVAL;
2806 } else {
2807 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2808 }
2809 // Xminf
2810 } else if (match_option(option, "-Xminf", &tail)) {
2811 char* err;
2812 int minf = (int)(strtod(tail, &err) * 100);
2813 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2814 jio_fprintf(defaultStream::error_stream(),
2815 "Bad min heap free percentage size: %s\n",
2816 option->optionString);
2817 return JNI_EINVAL;
2818 } else {
2819 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2820 }
2821 // -Xss
2822 } else if (match_option(option, "-Xss", &tail)) {
2823 julong long_ThreadStackSize = 0;
2824 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2825 if (errcode != arg_in_range) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Invalid thread stack size: %s\n", option->optionString);
2828 describe_range_error(errcode);
2829 return JNI_EINVAL;
2830 }
2831 // Internally track ThreadStackSize in units of 1024 bytes.
2832 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2833 round_to((int)long_ThreadStackSize, K) / K);
2834 // -Xoss
2835 } else if (match_option(option, "-Xoss", &tail)) {
2836 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2837 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2838 julong long_CodeCacheExpansionSize = 0;
2839 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2840 if (errcode != arg_in_range) {
2841 jio_fprintf(defaultStream::error_stream(),
2842 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2843 os::vm_page_size()/K);
2844 return JNI_EINVAL;
2845 }
2846 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2847 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2848 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2849 julong long_ReservedCodeCacheSize = 0;
2851 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2852 if (errcode != arg_in_range) {
2853 jio_fprintf(defaultStream::error_stream(),
2854 "Invalid maximum code cache size: %s.\n", option->optionString);
2855 return JNI_EINVAL;
2856 }
2857 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2858 //-XX:IncreaseFirstTierCompileThresholdAt=
2859 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2860 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2861 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2864 option->optionString);
2865 return JNI_EINVAL;
2866 }
2867 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2868 // -green
2869 } else if (match_option(option, "-green", &tail)) {
2870 jio_fprintf(defaultStream::error_stream(),
2871 "Green threads support not available\n");
2872 return JNI_EINVAL;
2873 // -native
2874 } else if (match_option(option, "-native", &tail)) {
2875 // HotSpot always uses native threads, ignore silently for compatibility
2876 // -Xsqnopause
2877 } else if (match_option(option, "-Xsqnopause", &tail)) {
2878 // EVM option, ignore silently for compatibility
2879 // -Xrs
2880 } else if (match_option(option, "-Xrs", &tail)) {
2881 // Classic/EVM option, new functionality
2882 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2883 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2884 // change default internal VM signals used - lower case for back compat
2885 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2886 // -Xoptimize
2887 } else if (match_option(option, "-Xoptimize", &tail)) {
2888 // EVM option, ignore silently for compatibility
2889 // -Xprof
2890 } else if (match_option(option, "-Xprof", &tail)) {
2891 #if INCLUDE_FPROF
2892 _has_profile = true;
2893 #else // INCLUDE_FPROF
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Flat profiling is not supported in this VM.\n");
2896 return JNI_ERR;
2897 #endif // INCLUDE_FPROF
2898 // -Xconcurrentio
2899 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2900 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2901 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2902 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2903 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2904 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2906 // -Xinternalversion
2907 } else if (match_option(option, "-Xinternalversion", &tail)) {
2908 jio_fprintf(defaultStream::output_stream(), "%s\n",
2909 VM_Version::internal_vm_info_string());
2910 vm_exit(0);
2911 #ifndef PRODUCT
2912 // -Xprintflags
2913 } else if (match_option(option, "-Xprintflags", &tail)) {
2914 CommandLineFlags::printFlags(tty, false);
2915 vm_exit(0);
2916 #endif
2917 // -D
2918 } else if (match_option(option, "-D", &tail)) {
2919 if (!add_property(tail)) {
2920 return JNI_ENOMEM;
2921 }
2922 // Out of the box management support
2923 if (match_option(option, "-Dcom.sun.management", &tail)) {
2924 #if INCLUDE_MANAGEMENT
2925 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2926 #else
2927 jio_fprintf(defaultStream::output_stream(),
2928 "-Dcom.sun.management is not supported in this VM.\n");
2929 return JNI_ERR;
2930 #endif
2931 }
2932 // -Xint
2933 } else if (match_option(option, "-Xint", &tail)) {
2934 set_mode_flags(_int);
2935 // -Xmixed
2936 } else if (match_option(option, "-Xmixed", &tail)) {
2937 set_mode_flags(_mixed);
2938 // -Xcomp
2939 } else if (match_option(option, "-Xcomp", &tail)) {
2940 // for testing the compiler; turn off all flags that inhibit compilation
2941 set_mode_flags(_comp);
2942 // -Xshare:dump
2943 } else if (match_option(option, "-Xshare:dump", &tail)) {
2944 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2945 set_mode_flags(_int); // Prevent compilation, which creates objects
2946 // -Xshare:on
2947 } else if (match_option(option, "-Xshare:on", &tail)) {
2948 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2949 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2950 // -Xshare:auto
2951 } else if (match_option(option, "-Xshare:auto", &tail)) {
2952 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2953 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2954 // -Xshare:off
2955 } else if (match_option(option, "-Xshare:off", &tail)) {
2956 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2957 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2958 // -Xverify
2959 } else if (match_option(option, "-Xverify", &tail)) {
2960 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2961 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2962 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2963 } else if (strcmp(tail, ":remote") == 0) {
2964 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2965 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2966 } else if (strcmp(tail, ":none") == 0) {
2967 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2968 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2969 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2970 return JNI_EINVAL;
2971 }
2972 // -Xdebug
2973 } else if (match_option(option, "-Xdebug", &tail)) {
2974 // note this flag has been used, then ignore
2975 set_xdebug_mode(true);
2976 // -Xnoagent
2977 } else if (match_option(option, "-Xnoagent", &tail)) {
2978 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2979 } else if (match_option(option, "-Xboundthreads", &tail)) {
2980 // Bind user level threads to kernel threads (Solaris only)
2981 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2982 } else if (match_option(option, "-Xloggc:", &tail)) {
2983 // Redirect GC output to the file. -Xloggc:<filename>
2984 // ostream_init_log(), when called will use this filename
2985 // to initialize a fileStream.
2986 _gc_log_filename = strdup(tail);
2987 if (!is_filename_valid(_gc_log_filename)) {
2988 jio_fprintf(defaultStream::output_stream(),
2989 "Invalid file name for use with -Xloggc: Filename can only contain the "
2990 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2991 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2992 return JNI_EINVAL;
2993 }
2994 FLAG_SET_CMDLINE(bool, PrintGC, true);
2995 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2997 // JNI hooks
2998 } else if (match_option(option, "-Xcheck", &tail)) {
2999 if (!strcmp(tail, ":jni")) {
3000 #if !INCLUDE_JNI_CHECK
3001 warning("JNI CHECKING is not supported in this VM");
3002 #else
3003 CheckJNICalls = true;
3004 #endif // INCLUDE_JNI_CHECK
3005 } else if (is_bad_option(option, args->ignoreUnrecognized,
3006 "check")) {
3007 return JNI_EINVAL;
3008 }
3009 } else if (match_option(option, "vfprintf", &tail)) {
3010 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3011 } else if (match_option(option, "exit", &tail)) {
3012 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3013 } else if (match_option(option, "abort", &tail)) {
3014 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3015 // -XX:+AggressiveHeap
3016 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3018 // This option inspects the machine and attempts to set various
3019 // parameters to be optimal for long-running, memory allocation
3020 // intensive jobs. It is intended for machines with large
3021 // amounts of cpu and memory.
3023 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3024 // VM, but we may not be able to represent the total physical memory
3025 // available (like having 8gb of memory on a box but using a 32bit VM).
3026 // Thus, we need to make sure we're using a julong for intermediate
3027 // calculations.
3028 julong initHeapSize;
3029 julong total_memory = os::physical_memory();
3031 if (total_memory < (julong)256*M) {
3032 jio_fprintf(defaultStream::error_stream(),
3033 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3034 vm_exit(1);
3035 }
3037 // The heap size is half of available memory, or (at most)
3038 // all of possible memory less 160mb (leaving room for the OS
3039 // when using ISM). This is the maximum; because adaptive sizing
3040 // is turned on below, the actual space used may be smaller.
3042 initHeapSize = MIN2(total_memory / (julong)2,
3043 total_memory - (julong)160*M);
3045 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3047 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3048 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3049 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3050 // Currently the minimum size and the initial heap sizes are the same.
3051 set_min_heap_size(initHeapSize);
3052 }
3053 if (FLAG_IS_DEFAULT(NewSize)) {
3054 // Make the young generation 3/8ths of the total heap.
3055 FLAG_SET_CMDLINE(uintx, NewSize,
3056 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3057 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3058 }
3060 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3061 FLAG_SET_DEFAULT(UseLargePages, true);
3062 #endif
3064 // Increase some data structure sizes for efficiency
3065 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3066 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3067 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3069 // See the OldPLABSize comment below, but replace 'after promotion'
3070 // with 'after copying'. YoungPLABSize is the size of the survivor
3071 // space per-gc-thread buffers. The default is 4kw.
3072 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3074 // OldPLABSize is the size of the buffers in the old gen that
3075 // UseParallelGC uses to promote live data that doesn't fit in the
3076 // survivor spaces. At any given time, there's one for each gc thread.
3077 // The default size is 1kw. These buffers are rarely used, since the
3078 // survivor spaces are usually big enough. For specjbb, however, there
3079 // are occasions when there's lots of live data in the young gen
3080 // and we end up promoting some of it. We don't have a definite
3081 // explanation for why bumping OldPLABSize helps, but the theory
3082 // is that a bigger PLAB results in retaining something like the
3083 // original allocation order after promotion, which improves mutator
3084 // locality. A minor effect may be that larger PLABs reduce the
3085 // number of PLAB allocation events during gc. The value of 8kw
3086 // was arrived at by experimenting with specjbb.
3087 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3089 // Enable parallel GC and adaptive generation sizing
3090 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3091 FLAG_SET_DEFAULT(ParallelGCThreads,
3092 Abstract_VM_Version::parallel_worker_threads());
3094 // Encourage steady state memory management
3095 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3097 // This appears to improve mutator locality
3098 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3100 // Get around early Solaris scheduling bug
3101 // (affinity vs other jobs on system)
3102 // but disallow DR and offlining (5008695).
3103 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3105 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3106 // The last option must always win.
3107 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3108 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3109 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3110 // The last option must always win.
3111 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3112 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3113 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3114 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3115 jio_fprintf(defaultStream::error_stream(),
3116 "Please use CMSClassUnloadingEnabled in place of "
3117 "CMSPermGenSweepingEnabled in the future\n");
3118 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3119 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3120 jio_fprintf(defaultStream::error_stream(),
3121 "Please use -XX:+UseGCOverheadLimit in place of "
3122 "-XX:+UseGCTimeLimit in the future\n");
3123 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3124 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3125 jio_fprintf(defaultStream::error_stream(),
3126 "Please use -XX:-UseGCOverheadLimit in place of "
3127 "-XX:-UseGCTimeLimit in the future\n");
3128 // The TLE options are for compatibility with 1.3 and will be
3129 // removed without notice in a future release. These options
3130 // are not to be documented.
3131 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3132 // No longer used.
3133 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3134 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3135 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3136 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3137 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3138 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3139 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3140 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3141 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3142 // No longer used.
3143 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3144 julong long_tlab_size = 0;
3145 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3146 if (errcode != arg_in_range) {
3147 jio_fprintf(defaultStream::error_stream(),
3148 "Invalid TLAB size: %s\n", option->optionString);
3149 describe_range_error(errcode);
3150 return JNI_EINVAL;
3151 }
3152 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3153 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3154 // No longer used.
3155 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3156 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3157 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3158 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3159 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3160 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3161 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3162 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3163 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3164 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3165 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3166 #if defined(DTRACE_ENABLED)
3167 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3168 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3169 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3170 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3171 #else // defined(DTRACE_ENABLED)
3172 jio_fprintf(defaultStream::error_stream(),
3173 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3174 return JNI_EINVAL;
3175 #endif // defined(DTRACE_ENABLED)
3176 #ifdef ASSERT
3177 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3178 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3179 // disable scavenge before parallel mark-compact
3180 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3181 #endif
3182 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3183 julong cms_blocks_to_claim = (julong)atol(tail);
3184 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3185 jio_fprintf(defaultStream::error_stream(),
3186 "Please use -XX:OldPLABSize in place of "
3187 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3188 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3189 julong cms_blocks_to_claim = (julong)atol(tail);
3190 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3191 jio_fprintf(defaultStream::error_stream(),
3192 "Please use -XX:OldPLABSize in place of "
3193 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3194 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3195 julong old_plab_size = 0;
3196 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3197 if (errcode != arg_in_range) {
3198 jio_fprintf(defaultStream::error_stream(),
3199 "Invalid old PLAB size: %s\n", option->optionString);
3200 describe_range_error(errcode);
3201 return JNI_EINVAL;
3202 }
3203 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3204 jio_fprintf(defaultStream::error_stream(),
3205 "Please use -XX:OldPLABSize in place of "
3206 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3207 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3208 julong young_plab_size = 0;
3209 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3210 if (errcode != arg_in_range) {
3211 jio_fprintf(defaultStream::error_stream(),
3212 "Invalid young PLAB size: %s\n", option->optionString);
3213 describe_range_error(errcode);
3214 return JNI_EINVAL;
3215 }
3216 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3217 jio_fprintf(defaultStream::error_stream(),
3218 "Please use -XX:YoungPLABSize in place of "
3219 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3220 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3221 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3222 julong stack_size = 0;
3223 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3224 if (errcode != arg_in_range) {
3225 jio_fprintf(defaultStream::error_stream(),
3226 "Invalid mark stack size: %s\n", option->optionString);
3227 describe_range_error(errcode);
3228 return JNI_EINVAL;
3229 }
3230 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3231 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3232 julong max_stack_size = 0;
3233 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3234 if (errcode != arg_in_range) {
3235 jio_fprintf(defaultStream::error_stream(),
3236 "Invalid maximum mark stack size: %s\n",
3237 option->optionString);
3238 describe_range_error(errcode);
3239 return JNI_EINVAL;
3240 }
3241 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3242 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3243 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3244 uintx conc_threads = 0;
3245 if (!parse_uintx(tail, &conc_threads, 1)) {
3246 jio_fprintf(defaultStream::error_stream(),
3247 "Invalid concurrent threads: %s\n", option->optionString);
3248 return JNI_EINVAL;
3249 }
3250 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3251 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3252 julong max_direct_memory_size = 0;
3253 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3254 if (errcode != arg_in_range) {
3255 jio_fprintf(defaultStream::error_stream(),
3256 "Invalid maximum direct memory size: %s\n",
3257 option->optionString);
3258 describe_range_error(errcode);
3259 return JNI_EINVAL;
3260 }
3261 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3262 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3263 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3264 // away and will cause VM initialization failures!
3265 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3266 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3267 #if !INCLUDE_MANAGEMENT
3268 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3269 jio_fprintf(defaultStream::error_stream(),
3270 "ManagementServer is not supported in this VM.\n");
3271 return JNI_ERR;
3272 #endif // INCLUDE_MANAGEMENT
3273 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3274 // Skip -XX:Flags= since that case has already been handled
3275 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3276 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3277 return JNI_EINVAL;
3278 }
3279 }
3280 // Unknown option
3281 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3282 return JNI_ERR;
3283 }
3284 }
3286 // PrintSharedArchiveAndExit will turn on
3287 // -Xshare:on
3288 // -XX:+TraceClassPaths
3289 if (PrintSharedArchiveAndExit) {
3290 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3291 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3292 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3293 }
3295 // Change the default value for flags which have different default values
3296 // when working with older JDKs.
3297 #ifdef LINUX
3298 if (JDK_Version::current().compare_major(6) <= 0 &&
3299 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3300 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3301 }
3302 #endif // LINUX
3303 fix_appclasspath();
3304 return JNI_OK;
3305 }
3307 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3308 //
3309 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3310 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3311 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3312 // path is treated as the current directory.
3313 //
3314 // This causes problems with CDS, which requires that all directories specified in the classpath
3315 // must be empty. In most cases, applications do NOT want to load classes from the current
3316 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3317 // scripts compatible with CDS.
3318 void Arguments::fix_appclasspath() {
3319 if (IgnoreEmptyClassPaths) {
3320 const char separator = *os::path_separator();
3321 const char* src = _java_class_path->value();
3323 // skip over all the leading empty paths
3324 while (*src == separator) {
3325 src ++;
3326 }
3328 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3329 strncpy(copy, src, strlen(src) + 1);
3331 // trim all trailing empty paths
3332 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3333 *tail = '\0';
3334 }
3336 char from[3] = {separator, separator, '\0'};
3337 char to [2] = {separator, '\0'};
3338 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3339 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3340 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3341 }
3343 _java_class_path->set_value(copy);
3344 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3345 }
3347 if (!PrintSharedArchiveAndExit) {
3348 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3349 }
3350 }
3352 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3353 // This must be done after all -D arguments have been processed.
3354 scp_p->expand_endorsed();
3356 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3357 // Assemble the bootclasspath elements into the final path.
3358 Arguments::set_sysclasspath(scp_p->combined_path());
3359 }
3361 // This must be done after all arguments have been processed.
3362 // java_compiler() true means set to "NONE" or empty.
3363 if (java_compiler() && !xdebug_mode()) {
3364 // For backwards compatibility, we switch to interpreted mode if
3365 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3366 // not specified.
3367 set_mode_flags(_int);
3368 }
3369 if (CompileThreshold == 0) {
3370 set_mode_flags(_int);
3371 }
3373 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3374 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3375 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3376 }
3378 #ifndef COMPILER2
3379 // Don't degrade server performance for footprint
3380 if (FLAG_IS_DEFAULT(UseLargePages) &&
3381 MaxHeapSize < LargePageHeapSizeThreshold) {
3382 // No need for large granularity pages w/small heaps.
3383 // Note that large pages are enabled/disabled for both the
3384 // Java heap and the code cache.
3385 FLAG_SET_DEFAULT(UseLargePages, false);
3386 }
3388 #else
3389 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3390 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3391 }
3392 #endif
3394 #ifndef TIERED
3395 // Tiered compilation is undefined.
3396 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3397 #endif
3399 // If we are running in a headless jre, force java.awt.headless property
3400 // to be true unless the property has already been set.
3401 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3402 if (os::is_headless_jre()) {
3403 const char* headless = Arguments::get_property("java.awt.headless");
3404 if (headless == NULL) {
3405 char envbuffer[128];
3406 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3407 if (!add_property("java.awt.headless=true")) {
3408 return JNI_ENOMEM;
3409 }
3410 } else {
3411 char buffer[256];
3412 strcpy(buffer, "java.awt.headless=");
3413 strcat(buffer, envbuffer);
3414 if (!add_property(buffer)) {
3415 return JNI_ENOMEM;
3416 }
3417 }
3418 }
3419 }
3421 if (!ArgumentsExt::check_vm_args_consistency()) {
3422 return JNI_ERR;
3423 }
3425 return JNI_OK;
3426 }
3428 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3429 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3430 scp_assembly_required_p);
3431 }
3433 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3434 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3435 scp_assembly_required_p);
3436 }
3438 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3439 const int N_MAX_OPTIONS = 64;
3440 const int OPTION_BUFFER_SIZE = 1024;
3441 char buffer[OPTION_BUFFER_SIZE];
3443 // The variable will be ignored if it exceeds the length of the buffer.
3444 // Don't check this variable if user has special privileges
3445 // (e.g. unix su command).
3446 if (os::getenv(name, buffer, sizeof(buffer)) &&
3447 !os::have_special_privileges()) {
3448 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3449 jio_fprintf(defaultStream::error_stream(),
3450 "Picked up %s: %s\n", name, buffer);
3451 char* rd = buffer; // pointer to the input string (rd)
3452 int i;
3453 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3454 while (isspace(*rd)) rd++; // skip whitespace
3455 if (*rd == 0) break; // we re done when the input string is read completely
3457 // The output, option string, overwrites the input string.
3458 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3459 // input string (rd).
3460 char* wrt = rd;
3462 options[i++].optionString = wrt; // Fill in option
3463 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3464 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3465 int quote = *rd; // matching quote to look for
3466 rd++; // don't copy open quote
3467 while (*rd != quote) { // include everything (even spaces) up until quote
3468 if (*rd == 0) { // string termination means unmatched string
3469 jio_fprintf(defaultStream::error_stream(),
3470 "Unmatched quote in %s\n", name);
3471 return JNI_ERR;
3472 }
3473 *wrt++ = *rd++; // copy to option string
3474 }
3475 rd++; // don't copy close quote
3476 } else {
3477 *wrt++ = *rd++; // copy to option string
3478 }
3479 }
3480 // Need to check if we're done before writing a NULL,
3481 // because the write could be to the byte that rd is pointing to.
3482 if (*rd++ == 0) {
3483 *wrt = 0;
3484 break;
3485 }
3486 *wrt = 0; // Zero terminate option
3487 }
3488 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3489 JavaVMInitArgs vm_args;
3490 vm_args.version = JNI_VERSION_1_2;
3491 vm_args.options = options;
3492 vm_args.nOptions = i;
3493 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3495 if (PrintVMOptions) {
3496 const char* tail;
3497 for (int i = 0; i < vm_args.nOptions; i++) {
3498 const JavaVMOption *option = vm_args.options + i;
3499 if (match_option(option, "-XX:", &tail)) {
3500 logOption(tail);
3501 }
3502 }
3503 }
3505 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3506 }
3507 return JNI_OK;
3508 }
3510 void Arguments::set_shared_spaces_flags() {
3511 if (DumpSharedSpaces) {
3512 if (RequireSharedSpaces) {
3513 warning("cannot dump shared archive while using shared archive");
3514 }
3515 UseSharedSpaces = false;
3516 #ifdef _LP64
3517 if (!UseCompressedOops || !UseCompressedClassPointers) {
3518 vm_exit_during_initialization(
3519 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3520 }
3521 } else {
3522 if (!UseCompressedOops || !UseCompressedClassPointers) {
3523 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3524 }
3525 #endif
3526 }
3527 }
3529 #if !INCLUDE_ALL_GCS
3530 static void force_serial_gc() {
3531 FLAG_SET_DEFAULT(UseSerialGC, true);
3532 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3533 UNSUPPORTED_GC_OPTION(UseG1GC);
3534 UNSUPPORTED_GC_OPTION(UseParallelGC);
3535 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3536 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3537 UNSUPPORTED_GC_OPTION(UseParNewGC);
3538 }
3539 #endif // INCLUDE_ALL_GCS
3541 // Sharing support
3542 // Construct the path to the archive
3543 static char* get_shared_archive_path() {
3544 char *shared_archive_path;
3545 if (SharedArchiveFile == NULL) {
3546 char jvm_path[JVM_MAXPATHLEN];
3547 os::jvm_path(jvm_path, sizeof(jvm_path));
3548 char *end = strrchr(jvm_path, *os::file_separator());
3549 if (end != NULL) *end = '\0';
3550 size_t jvm_path_len = strlen(jvm_path);
3551 size_t file_sep_len = strlen(os::file_separator());
3552 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3553 file_sep_len + 20, mtInternal);
3554 if (shared_archive_path != NULL) {
3555 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3556 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3557 strncat(shared_archive_path, "classes.jsa", 11);
3558 }
3559 } else {
3560 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3561 if (shared_archive_path != NULL) {
3562 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3563 }
3564 }
3565 return shared_archive_path;
3566 }
3568 #ifndef PRODUCT
3569 // Determine whether LogVMOutput should be implicitly turned on.
3570 static bool use_vm_log() {
3571 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3572 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3573 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3574 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3575 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3576 return true;
3577 }
3579 #ifdef COMPILER1
3580 if (PrintC1Statistics) {
3581 return true;
3582 }
3583 #endif // COMPILER1
3585 #ifdef COMPILER2
3586 if (PrintOptoAssembly || PrintOptoStatistics) {
3587 return true;
3588 }
3589 #endif // COMPILER2
3591 return false;
3592 }
3593 #endif // PRODUCT
3595 // Parse entry point called from JNI_CreateJavaVM
3597 jint Arguments::parse(const JavaVMInitArgs* args) {
3599 // Remaining part of option string
3600 const char* tail;
3602 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3603 const char* hotspotrc = ".hotspotrc";
3604 bool settings_file_specified = false;
3605 bool needs_hotspotrc_warning = false;
3607 const char* flags_file;
3608 int index;
3609 for (index = 0; index < args->nOptions; index++) {
3610 const JavaVMOption *option = args->options + index;
3611 if (match_option(option, "-XX:Flags=", &tail)) {
3612 flags_file = tail;
3613 settings_file_specified = true;
3614 }
3615 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3616 PrintVMOptions = true;
3617 }
3618 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3619 PrintVMOptions = false;
3620 }
3621 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3622 IgnoreUnrecognizedVMOptions = true;
3623 }
3624 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3625 IgnoreUnrecognizedVMOptions = false;
3626 }
3627 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3628 CommandLineFlags::printFlags(tty, false);
3629 vm_exit(0);
3630 }
3631 #if INCLUDE_NMT
3632 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3633 // The launcher did not setup nmt environment variable properly.
3634 if (!MemTracker::check_launcher_nmt_support(tail)) {
3635 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3636 }
3638 // Verify if nmt option is valid.
3639 if (MemTracker::verify_nmt_option()) {
3640 // Late initialization, still in single-threaded mode.
3641 if (MemTracker::tracking_level() >= NMT_summary) {
3642 MemTracker::init();
3643 }
3644 } else {
3645 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3646 }
3647 }
3648 #endif
3651 #ifndef PRODUCT
3652 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3653 CommandLineFlags::printFlags(tty, true);
3654 vm_exit(0);
3655 }
3656 #endif
3657 }
3659 if (IgnoreUnrecognizedVMOptions) {
3660 // uncast const to modify the flag args->ignoreUnrecognized
3661 *(jboolean*)(&args->ignoreUnrecognized) = true;
3662 }
3664 // Parse specified settings file
3665 if (settings_file_specified) {
3666 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3667 return JNI_EINVAL;
3668 }
3669 } else {
3670 #ifdef ASSERT
3671 // Parse default .hotspotrc settings file
3672 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3673 return JNI_EINVAL;
3674 }
3675 #else
3676 struct stat buf;
3677 if (os::stat(hotspotrc, &buf) == 0) {
3678 needs_hotspotrc_warning = true;
3679 }
3680 #endif
3681 }
3683 if (PrintVMOptions) {
3684 for (index = 0; index < args->nOptions; index++) {
3685 const JavaVMOption *option = args->options + index;
3686 if (match_option(option, "-XX:", &tail)) {
3687 logOption(tail);
3688 }
3689 }
3690 }
3692 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3693 jint result = parse_vm_init_args(args);
3694 if (result != JNI_OK) {
3695 return result;
3696 }
3698 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3699 SharedArchivePath = get_shared_archive_path();
3700 if (SharedArchivePath == NULL) {
3701 return JNI_ENOMEM;
3702 }
3704 // Delay warning until here so that we've had a chance to process
3705 // the -XX:-PrintWarnings flag
3706 if (needs_hotspotrc_warning) {
3707 warning("%s file is present but has been ignored. "
3708 "Run with -XX:Flags=%s to load the file.",
3709 hotspotrc, hotspotrc);
3710 }
3712 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3713 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3714 #endif
3716 #if INCLUDE_ALL_GCS
3717 #if (defined JAVASE_EMBEDDED || defined ARM)
3718 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3719 #endif
3720 #endif
3722 #ifndef PRODUCT
3723 if (TraceBytecodesAt != 0) {
3724 TraceBytecodes = true;
3725 }
3726 if (CountCompiledCalls) {
3727 if (UseCounterDecay) {
3728 warning("UseCounterDecay disabled because CountCalls is set");
3729 UseCounterDecay = false;
3730 }
3731 }
3732 #endif // PRODUCT
3734 // JSR 292 is not supported before 1.7
3735 if (!JDK_Version::is_gte_jdk17x_version()) {
3736 if (EnableInvokeDynamic) {
3737 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3738 warning("JSR 292 is not supported before 1.7. Disabling support.");
3739 }
3740 EnableInvokeDynamic = false;
3741 }
3742 }
3744 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3745 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3746 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3747 }
3748 ScavengeRootsInCode = 1;
3749 }
3751 if (PrintGCDetails) {
3752 // Turn on -verbose:gc options as well
3753 PrintGC = true;
3754 }
3756 if (!JDK_Version::is_gte_jdk18x_version()) {
3757 // To avoid changing the log format for 7 updates this flag is only
3758 // true by default in JDK8 and above.
3759 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3760 FLAG_SET_DEFAULT(PrintGCCause, false);
3761 }
3762 }
3764 // Set object alignment values.
3765 set_object_alignment();
3767 #if !INCLUDE_ALL_GCS
3768 force_serial_gc();
3769 #endif // INCLUDE_ALL_GCS
3770 #if !INCLUDE_CDS
3771 if (DumpSharedSpaces || RequireSharedSpaces) {
3772 jio_fprintf(defaultStream::error_stream(),
3773 "Shared spaces are not supported in this VM\n");
3774 return JNI_ERR;
3775 }
3776 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3777 warning("Shared spaces are not supported in this VM");
3778 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3779 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3780 }
3781 no_shared_spaces("CDS Disabled");
3782 #endif // INCLUDE_CDS
3784 return JNI_OK;
3785 }
3787 jint Arguments::apply_ergo() {
3789 // Set flags based on ergonomics.
3790 set_ergonomics_flags();
3792 set_shared_spaces_flags();
3794 // Check the GC selections again.
3795 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3796 return JNI_EINVAL;
3797 }
3799 if (TieredCompilation) {
3800 set_tiered_flags();
3801 } else {
3802 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3803 if (CompilationPolicyChoice >= 2) {
3804 vm_exit_during_initialization(
3805 "Incompatible compilation policy selected", NULL);
3806 }
3807 }
3808 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3809 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3810 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3811 }
3814 // Set heap size based on available physical memory
3815 set_heap_size();
3817 set_gc_specific_flags();
3819 // Initialize Metaspace flags and alignments.
3820 Metaspace::ergo_initialize();
3822 // Set bytecode rewriting flags
3823 set_bytecode_flags();
3825 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3826 set_aggressive_opts_flags();
3828 // Turn off biased locking for locking debug mode flags,
3829 // which are subtlely different from each other but neither works with
3830 // biased locking.
3831 if (UseHeavyMonitors
3832 #ifdef COMPILER1
3833 || !UseFastLocking
3834 #endif // COMPILER1
3835 ) {
3836 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3837 // flag set to true on command line; warn the user that they
3838 // can't enable biased locking here
3839 warning("Biased Locking is not supported with locking debug flags"
3840 "; ignoring UseBiasedLocking flag." );
3841 }
3842 UseBiasedLocking = false;
3843 }
3845 #ifdef ZERO
3846 // Clear flags not supported on zero.
3847 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3848 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3849 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3850 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3851 #endif // CC_INTERP
3853 #ifdef COMPILER2
3854 if (!EliminateLocks) {
3855 EliminateNestedLocks = false;
3856 }
3857 if (!Inline) {
3858 IncrementalInline = false;
3859 }
3860 #ifndef PRODUCT
3861 if (!IncrementalInline) {
3862 AlwaysIncrementalInline = false;
3863 }
3864 #endif
3865 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3866 // incremental inlining: bump MaxNodeLimit
3867 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3868 }
3869 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3870 // nothing to use the profiling, turn if off
3871 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3872 }
3873 #endif
3875 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3876 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3877 DebugNonSafepoints = true;
3878 }
3880 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3881 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3882 }
3884 #ifndef PRODUCT
3885 if (CompileTheWorld) {
3886 // Force NmethodSweeper to sweep whole CodeCache each time.
3887 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3888 NmethodSweepFraction = 1;
3889 }
3890 }
3892 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3893 if (use_vm_log()) {
3894 LogVMOutput = true;
3895 }
3896 }
3897 #endif // PRODUCT
3899 if (PrintCommandLineFlags) {
3900 CommandLineFlags::printSetFlags(tty);
3901 }
3903 // Apply CPU specific policy for the BiasedLocking
3904 if (UseBiasedLocking) {
3905 if (!VM_Version::use_biased_locking() &&
3906 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3907 UseBiasedLocking = false;
3908 }
3909 }
3910 #ifdef COMPILER2
3911 if (!UseBiasedLocking || EmitSync != 0) {
3912 UseOptoBiasInlining = false;
3913 }
3914 #endif
3916 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3917 // but only if not already set on the commandline
3918 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3919 bool set = false;
3920 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3921 if (!set) {
3922 FLAG_SET_DEFAULT(PauseAtExit, true);
3923 }
3924 }
3926 return JNI_OK;
3927 }
3929 jint Arguments::adjust_after_os() {
3930 if (UseNUMA) {
3931 if (UseParallelGC || UseParallelOldGC) {
3932 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3933 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3934 }
3935 }
3936 // UseNUMAInterleaving is set to ON for all collectors and
3937 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3938 // such as the parallel collector for Linux and Solaris will
3939 // interleave old gen and survivor spaces on top of NUMA
3940 // allocation policy for the eden space.
3941 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3942 // all platforms and ParallelGC on Windows will interleave all
3943 // of the heap spaces across NUMA nodes.
3944 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3945 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3946 }
3947 }
3948 return JNI_OK;
3949 }
3951 int Arguments::PropertyList_count(SystemProperty* pl) {
3952 int count = 0;
3953 while(pl != NULL) {
3954 count++;
3955 pl = pl->next();
3956 }
3957 return count;
3958 }
3960 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3961 assert(key != NULL, "just checking");
3962 SystemProperty* prop;
3963 for (prop = pl; prop != NULL; prop = prop->next()) {
3964 if (strcmp(key, prop->key()) == 0) return prop->value();
3965 }
3966 return NULL;
3967 }
3969 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3970 int count = 0;
3971 const char* ret_val = NULL;
3973 while(pl != NULL) {
3974 if(count >= index) {
3975 ret_val = pl->key();
3976 break;
3977 }
3978 count++;
3979 pl = pl->next();
3980 }
3982 return ret_val;
3983 }
3985 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3986 int count = 0;
3987 char* ret_val = NULL;
3989 while(pl != NULL) {
3990 if(count >= index) {
3991 ret_val = pl->value();
3992 break;
3993 }
3994 count++;
3995 pl = pl->next();
3996 }
3998 return ret_val;
3999 }
4001 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4002 SystemProperty* p = *plist;
4003 if (p == NULL) {
4004 *plist = new_p;
4005 } else {
4006 while (p->next() != NULL) {
4007 p = p->next();
4008 }
4009 p->set_next(new_p);
4010 }
4011 }
4013 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4014 if (plist == NULL)
4015 return;
4017 SystemProperty* new_p = new SystemProperty(k, v, true);
4018 PropertyList_add(plist, new_p);
4019 }
4021 // This add maintains unique property key in the list.
4022 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4023 if (plist == NULL)
4024 return;
4026 // If property key exist then update with new value.
4027 SystemProperty* prop;
4028 for (prop = *plist; prop != NULL; prop = prop->next()) {
4029 if (strcmp(k, prop->key()) == 0) {
4030 if (append) {
4031 prop->append_value(v);
4032 } else {
4033 prop->set_value(v);
4034 }
4035 return;
4036 }
4037 }
4039 PropertyList_add(plist, k, v);
4040 }
4042 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4043 // Returns true if all of the source pointed by src has been copied over to
4044 // the destination buffer pointed by buf. Otherwise, returns false.
4045 // Notes:
4046 // 1. If the length (buflen) of the destination buffer excluding the
4047 // NULL terminator character is not long enough for holding the expanded
4048 // pid characters, it also returns false instead of returning the partially
4049 // expanded one.
4050 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4051 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4052 char* buf, size_t buflen) {
4053 const char* p = src;
4054 char* b = buf;
4055 const char* src_end = &src[srclen];
4056 char* buf_end = &buf[buflen - 1];
4058 while (p < src_end && b < buf_end) {
4059 if (*p == '%') {
4060 switch (*(++p)) {
4061 case '%': // "%%" ==> "%"
4062 *b++ = *p++;
4063 break;
4064 case 'p': { // "%p" ==> current process id
4065 // buf_end points to the character before the last character so
4066 // that we could write '\0' to the end of the buffer.
4067 size_t buf_sz = buf_end - b + 1;
4068 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4070 // if jio_snprintf fails or the buffer is not long enough to hold
4071 // the expanded pid, returns false.
4072 if (ret < 0 || ret >= (int)buf_sz) {
4073 return false;
4074 } else {
4075 b += ret;
4076 assert(*b == '\0', "fail in copy_expand_pid");
4077 if (p == src_end && b == buf_end + 1) {
4078 // reach the end of the buffer.
4079 return true;
4080 }
4081 }
4082 p++;
4083 break;
4084 }
4085 default :
4086 *b++ = '%';
4087 }
4088 } else {
4089 *b++ = *p++;
4090 }
4091 }
4092 *b = '\0';
4093 return (p == src_end); // return false if not all of the source was copied
4094 }