Wed, 03 Jul 2013 17:26:59 -0400
7133260: AllocationProfiler uses space in metadata and doesn't seem to do anything useful.
Summary: Remove -Xaprof and Klass::_alloc_count & ArrayKlass::_alloc_size.
Reviewed-by: stefank, coleenp
1 /*
2 * Copyright (c) 1997, 2013, 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/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_bsd
53 # include "os_bsd.inline.hpp"
54 #endif
55 #if INCLUDE_ALL_GCS
56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
57 #endif // INCLUDE_ALL_GCS
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
63 char** Arguments::_jvm_flags_array = NULL;
64 int Arguments::_num_jvm_flags = 0;
65 char** Arguments::_jvm_args_array = NULL;
66 int Arguments::_num_jvm_args = 0;
67 char* Arguments::_java_command = NULL;
68 SystemProperty* Arguments::_system_properties = NULL;
69 const char* Arguments::_gc_log_filename = NULL;
70 bool Arguments::_has_profile = false;
71 uintx Arguments::_min_heap_size = 0;
72 Arguments::Mode Arguments::_mode = _mixed;
73 bool Arguments::_java_compiler = false;
74 bool Arguments::_xdebug_mode = false;
75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
77 int Arguments::_sun_java_launcher_pid = -1;
78 bool Arguments::_created_by_gamma_launcher = false;
80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
83 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
84 bool Arguments::_ClipInlining = ClipInlining;
86 char* Arguments::SharedArchivePath = NULL;
88 AgentLibraryList Arguments::_libraryList;
89 AgentLibraryList Arguments::_agentList;
91 abort_hook_t Arguments::_abort_hook = NULL;
92 exit_hook_t Arguments::_exit_hook = NULL;
93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
96 SystemProperty *Arguments::_java_ext_dirs = NULL;
97 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
98 SystemProperty *Arguments::_sun_boot_library_path = NULL;
99 SystemProperty *Arguments::_java_library_path = NULL;
100 SystemProperty *Arguments::_java_home = NULL;
101 SystemProperty *Arguments::_java_class_path = NULL;
102 SystemProperty *Arguments::_sun_boot_class_path = NULL;
104 char* Arguments::_meta_index_path = NULL;
105 char* Arguments::_meta_index_dir = NULL;
107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
109 static bool match_option(const JavaVMOption *option, const char* name,
110 const char** tail) {
111 int len = (int)strlen(name);
112 if (strncmp(option->optionString, name, len) == 0) {
113 *tail = option->optionString + len;
114 return true;
115 } else {
116 return false;
117 }
118 }
120 static void logOption(const char* opt) {
121 if (PrintVMOptions) {
122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 }
124 }
126 // Process java launcher properties.
127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 // Must do this before setting up other system properties,
130 // as some of them may depend on launcher type.
131 for (int index = 0; index < args->nOptions; index++) {
132 const JavaVMOption* option = args->options + index;
133 const char* tail;
135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 process_java_launcher_argument(tail, option->extraInfo);
137 continue;
138 }
139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 _sun_java_launcher_pid = atoi(tail);
141 continue;
142 }
143 }
144 }
146 // Initialize system properties key and value.
147 void Arguments::init_system_properties() {
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 "Java Virtual Machine Specification", false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
155 // following are JVMTI agent writeable properties.
156 // Properties values are set to NULL and they are
157 // os specific they are initialized in os::init_system_properties_values().
158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 _java_home = new SystemProperty("java.home", NULL, true);
163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
165 _java_class_path = new SystemProperty("java.class.path", "", true);
167 // Add to System Property list.
168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 PropertyList_add(&_system_properties, _java_library_path);
172 PropertyList_add(&_system_properties, _java_home);
173 PropertyList_add(&_system_properties, _java_class_path);
174 PropertyList_add(&_system_properties, _sun_boot_class_path);
176 // Set OS specific system properties values
177 os::init_system_properties_values();
178 }
181 // Update/Initialize System properties after JDK version number is known
182 void Arguments::init_version_specific_system_properties() {
183 enum { bufsz = 16 };
184 char buffer[bufsz];
185 const char* spec_vendor = "Sun Microsystems Inc.";
186 uint32_t spec_version = 0;
188 if (JDK_Version::is_gte_jdk17x_version()) {
189 spec_vendor = "Oracle Corporation";
190 spec_version = JDK_Version::current().major_version();
191 }
192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.specification.version", buffer, false));
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 }
202 /**
203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 * When a flag is eliminated, it can be added to this list in order to
205 * continue accepting this flag on the command-line, while issuing a warning
206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 * a flag to die correctly over JDK releases using HSX.
209 */
210 typedef struct {
211 const char* name;
212 JDK_Version obsoleted_in; // when the flag went away
213 JDK_Version accept_until; // which version to start denying the existence
214 } ObsoleteFlag;
216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "DefaultInitialRAMFraction",
233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 { "UseDepthFirstScavengeOrder",
235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 { "HandlePromotionFailure",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "MaxLiveObjectEvacuationRatio",
239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 { "UseParallelOldGCCompacting",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelDensePrefixUpdate",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "UseParallelOldGCDensePrefix",
246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 #ifdef PRODUCT
264 { "DesiredMethodLimit",
265 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
266 #endif // PRODUCT
267 { NULL, JDK_Version(0), JDK_Version(0) }
268 };
270 // Returns true if the flag is obsolete and fits into the range specified
271 // for being ignored. In the case that the flag is ignored, the 'version'
272 // value is filled in with the version number when the flag became
273 // obsolete so that that value can be displayed to the user.
274 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
275 int i = 0;
276 assert(version != NULL, "Must provide a version buffer");
277 while (obsolete_jvm_flags[i].name != NULL) {
278 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
279 // <flag>=xxx form
280 // [-|+]<flag> form
281 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
282 ((s[0] == '+' || s[0] == '-') &&
283 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
284 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
285 *version = flag_status.obsoleted_in;
286 return true;
287 }
288 }
289 i++;
290 }
291 return false;
292 }
294 // Constructs the system class path (aka boot class path) from the following
295 // components, in order:
296 //
297 // prefix // from -Xbootclasspath/p:...
298 // endorsed // the expansion of -Djava.endorsed.dirs=...
299 // base // from os::get_system_properties() or -Xbootclasspath=
300 // suffix // from -Xbootclasspath/a:...
301 //
302 // java.endorsed.dirs is a list of directories; any jar or zip files in the
303 // directories are added to the sysclasspath just before the base.
304 //
305 // This could be AllStatic, but it isn't needed after argument processing is
306 // complete.
307 class SysClassPath: public StackObj {
308 public:
309 SysClassPath(const char* base);
310 ~SysClassPath();
312 inline void set_base(const char* base);
313 inline void add_prefix(const char* prefix);
314 inline void add_suffix_to_prefix(const char* suffix);
315 inline void add_suffix(const char* suffix);
316 inline void reset_path(const char* base);
318 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
319 // property. Must be called after all command-line arguments have been
320 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
321 // combined_path().
322 void expand_endorsed();
324 inline const char* get_base() const { return _items[_scp_base]; }
325 inline const char* get_prefix() const { return _items[_scp_prefix]; }
326 inline const char* get_suffix() const { return _items[_scp_suffix]; }
327 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
329 // Combine all the components into a single c-heap-allocated string; caller
330 // must free the string if/when no longer needed.
331 char* combined_path();
333 private:
334 // Utility routines.
335 static char* add_to_path(const char* path, const char* str, bool prepend);
336 static char* add_jars_to_path(char* path, const char* directory);
338 inline void reset_item_at(int index);
340 // Array indices for the items that make up the sysclasspath. All except the
341 // base are allocated in the C heap and freed by this class.
342 enum {
343 _scp_prefix, // from -Xbootclasspath/p:...
344 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
345 _scp_base, // the default sysclasspath
346 _scp_suffix, // from -Xbootclasspath/a:...
347 _scp_nitems // the number of items, must be last.
348 };
350 const char* _items[_scp_nitems];
351 DEBUG_ONLY(bool _expansion_done;)
352 };
354 SysClassPath::SysClassPath(const char* base) {
355 memset(_items, 0, sizeof(_items));
356 _items[_scp_base] = base;
357 DEBUG_ONLY(_expansion_done = false;)
358 }
360 SysClassPath::~SysClassPath() {
361 // Free everything except the base.
362 for (int i = 0; i < _scp_nitems; ++i) {
363 if (i != _scp_base) reset_item_at(i);
364 }
365 DEBUG_ONLY(_expansion_done = false;)
366 }
368 inline void SysClassPath::set_base(const char* base) {
369 _items[_scp_base] = base;
370 }
372 inline void SysClassPath::add_prefix(const char* prefix) {
373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
374 }
376 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
378 }
380 inline void SysClassPath::add_suffix(const char* suffix) {
381 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
382 }
384 inline void SysClassPath::reset_item_at(int index) {
385 assert(index < _scp_nitems && index != _scp_base, "just checking");
386 if (_items[index] != NULL) {
387 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
388 _items[index] = NULL;
389 }
390 }
392 inline void SysClassPath::reset_path(const char* base) {
393 // Clear the prefix and suffix.
394 reset_item_at(_scp_prefix);
395 reset_item_at(_scp_suffix);
396 set_base(base);
397 }
399 //------------------------------------------------------------------------------
401 void SysClassPath::expand_endorsed() {
402 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
404 const char* path = Arguments::get_property("java.endorsed.dirs");
405 if (path == NULL) {
406 path = Arguments::get_endorsed_dir();
407 assert(path != NULL, "no default for java.endorsed.dirs");
408 }
410 char* expanded_path = NULL;
411 const char separator = *os::path_separator();
412 const char* const end = path + strlen(path);
413 while (path < end) {
414 const char* tmp_end = strchr(path, separator);
415 if (tmp_end == NULL) {
416 expanded_path = add_jars_to_path(expanded_path, path);
417 path = end;
418 } else {
419 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
420 memcpy(dirpath, path, tmp_end - path);
421 dirpath[tmp_end - path] = '\0';
422 expanded_path = add_jars_to_path(expanded_path, dirpath);
423 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
424 path = tmp_end + 1;
425 }
426 }
427 _items[_scp_endorsed] = expanded_path;
428 DEBUG_ONLY(_expansion_done = true;)
429 }
431 // Combine the bootclasspath elements, some of which may be null, into a single
432 // c-heap-allocated string.
433 char* SysClassPath::combined_path() {
434 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
435 assert(_expansion_done, "must call expand_endorsed() first.");
437 size_t lengths[_scp_nitems];
438 size_t total_len = 0;
440 const char separator = *os::path_separator();
442 // Get the lengths.
443 int i;
444 for (i = 0; i < _scp_nitems; ++i) {
445 if (_items[i] != NULL) {
446 lengths[i] = strlen(_items[i]);
447 // Include space for the separator char (or a NULL for the last item).
448 total_len += lengths[i] + 1;
449 }
450 }
451 assert(total_len > 0, "empty sysclasspath not allowed");
453 // Copy the _items to a single string.
454 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
455 char* cp_tmp = cp;
456 for (i = 0; i < _scp_nitems; ++i) {
457 if (_items[i] != NULL) {
458 memcpy(cp_tmp, _items[i], lengths[i]);
459 cp_tmp += lengths[i];
460 *cp_tmp++ = separator;
461 }
462 }
463 *--cp_tmp = '\0'; // Replace the extra separator.
464 return cp;
465 }
467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
468 char*
469 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
470 char *cp;
472 assert(str != NULL, "just checking");
473 if (path == NULL) {
474 size_t len = strlen(str) + 1;
475 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
476 memcpy(cp, str, len); // copy the trailing null
477 } else {
478 const char separator = *os::path_separator();
479 size_t old_len = strlen(path);
480 size_t str_len = strlen(str);
481 size_t len = old_len + str_len + 2;
483 if (prepend) {
484 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
485 char* cp_tmp = cp;
486 memcpy(cp_tmp, str, str_len);
487 cp_tmp += str_len;
488 *cp_tmp = separator;
489 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
490 FREE_C_HEAP_ARRAY(char, path, mtInternal);
491 } else {
492 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
493 char* cp_tmp = cp + old_len;
494 *cp_tmp = separator;
495 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
496 }
497 }
498 return cp;
499 }
501 // Scan the directory and append any jar or zip files found to path.
502 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
503 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
504 DIR* dir = os::opendir(directory);
505 if (dir == NULL) return path;
507 char dir_sep[2] = { '\0', '\0' };
508 size_t directory_len = strlen(directory);
509 const char fileSep = *os::file_separator();
510 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
512 /* Scan the directory for jars/zips, appending them to path. */
513 struct dirent *entry;
514 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
515 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
516 const char* name = entry->d_name;
517 const char* ext = name + strlen(name) - 4;
518 bool isJarOrZip = ext > name &&
519 (os::file_name_strcmp(ext, ".jar") == 0 ||
520 os::file_name_strcmp(ext, ".zip") == 0);
521 if (isJarOrZip) {
522 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
523 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
524 path = add_to_path(path, jarpath, false);
525 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
526 }
527 }
528 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
529 os::closedir(dir);
530 return path;
531 }
533 // Parses a memory size specification string.
534 static bool atomull(const char *s, julong* result) {
535 julong n = 0;
536 int args_read = sscanf(s, JULONG_FORMAT, &n);
537 if (args_read != 1) {
538 return false;
539 }
540 while (*s != '\0' && isdigit(*s)) {
541 s++;
542 }
543 // 4705540: illegal if more characters are found after the first non-digit
544 if (strlen(s) > 1) {
545 return false;
546 }
547 switch (*s) {
548 case 'T': case 't':
549 *result = n * G * K;
550 // Check for overflow.
551 if (*result/((julong)G * K) != n) return false;
552 return true;
553 case 'G': case 'g':
554 *result = n * G;
555 if (*result/G != n) return false;
556 return true;
557 case 'M': case 'm':
558 *result = n * M;
559 if (*result/M != n) return false;
560 return true;
561 case 'K': case 'k':
562 *result = n * K;
563 if (*result/K != n) return false;
564 return true;
565 case '\0':
566 *result = n;
567 return true;
568 default:
569 return false;
570 }
571 }
573 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
574 if (size < min_size) return arg_too_small;
575 // Check that size will fit in a size_t (only relevant on 32-bit)
576 if (size > max_uintx) return arg_too_big;
577 return arg_in_range;
578 }
580 // Describe an argument out of range error
581 void Arguments::describe_range_error(ArgsRange errcode) {
582 switch(errcode) {
583 case arg_too_big:
584 jio_fprintf(defaultStream::error_stream(),
585 "The specified size exceeds the maximum "
586 "representable size.\n");
587 break;
588 case arg_too_small:
589 case arg_unreadable:
590 case arg_in_range:
591 // do nothing for now
592 break;
593 default:
594 ShouldNotReachHere();
595 }
596 }
598 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
599 return CommandLineFlags::boolAtPut(name, &value, origin);
600 }
602 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
603 double v;
604 if (sscanf(value, "%lf", &v) != 1) {
605 return false;
606 }
608 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
609 return true;
610 }
611 return false;
612 }
614 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
615 julong v;
616 intx intx_v;
617 bool is_neg = false;
618 // Check the sign first since atomull() parses only unsigned values.
619 if (*value == '-') {
620 if (!CommandLineFlags::intxAt(name, &intx_v)) {
621 return false;
622 }
623 value++;
624 is_neg = true;
625 }
626 if (!atomull(value, &v)) {
627 return false;
628 }
629 intx_v = (intx) v;
630 if (is_neg) {
631 intx_v = -intx_v;
632 }
633 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
634 return true;
635 }
636 uintx uintx_v = (uintx) v;
637 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
638 return true;
639 }
640 uint64_t uint64_t_v = (uint64_t) v;
641 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
642 return true;
643 }
644 return false;
645 }
647 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
648 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
649 // Contract: CommandLineFlags always returns a pointer that needs freeing.
650 FREE_C_HEAP_ARRAY(char, value, mtInternal);
651 return true;
652 }
654 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
655 const char* old_value = "";
656 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
657 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
658 size_t new_len = strlen(new_value);
659 const char* value;
660 char* free_this_too = NULL;
661 if (old_len == 0) {
662 value = new_value;
663 } else if (new_len == 0) {
664 value = old_value;
665 } else {
666 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
667 // each new setting adds another LINE to the switch:
668 sprintf(buf, "%s\n%s", old_value, new_value);
669 value = buf;
670 free_this_too = buf;
671 }
672 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
673 // CommandLineFlags always returns a pointer that needs freeing.
674 FREE_C_HEAP_ARRAY(char, value, mtInternal);
675 if (free_this_too != NULL) {
676 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
677 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
678 }
679 return true;
680 }
682 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
684 // range of acceptable characters spelled out for portability reasons
685 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
686 #define BUFLEN 255
687 char name[BUFLEN+1];
688 char dummy;
690 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
691 return set_bool_flag(name, false, origin);
692 }
693 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
694 return set_bool_flag(name, true, origin);
695 }
697 char punct;
698 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
699 const char* value = strchr(arg, '=') + 1;
700 Flag* flag = Flag::find_flag(name, strlen(name));
701 if (flag != NULL && flag->is_ccstr()) {
702 if (flag->ccstr_accumulates()) {
703 return append_to_string_flag(name, value, origin);
704 } else {
705 if (value[0] == '\0') {
706 value = NULL;
707 }
708 return set_string_flag(name, value, origin);
709 }
710 }
711 }
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
714 const char* value = strchr(arg, '=') + 1;
715 // -XX:Foo:=xxx will reset the string flag to the given value.
716 if (value[0] == '\0') {
717 value = NULL;
718 }
719 return set_string_flag(name, value, origin);
720 }
722 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
723 #define SIGNED_NUMBER_RANGE "[-0123456789]"
724 #define NUMBER_RANGE "[0123456789]"
725 char value[BUFLEN + 1];
726 char value2[BUFLEN + 1];
727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
728 // Looks like a floating-point number -- try again with more lenient format string
729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
730 return set_fp_numeric_flag(name, value, origin);
731 }
732 }
734 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
735 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
736 return set_numeric_flag(name, value, origin);
737 }
739 return false;
740 }
742 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
743 assert(bldarray != NULL, "illegal argument");
745 if (arg == NULL) {
746 return;
747 }
749 int new_count = *count + 1;
751 // expand the array and add arg to the last element
752 if (*bldarray == NULL) {
753 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
754 } else {
755 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
756 }
757 (*bldarray)[*count] = strdup(arg);
758 *count = new_count;
759 }
761 void Arguments::build_jvm_args(const char* arg) {
762 add_string(&_jvm_args_array, &_num_jvm_args, arg);
763 }
765 void Arguments::build_jvm_flags(const char* arg) {
766 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
767 }
769 // utility function to return a string that concatenates all
770 // strings in a given char** array
771 const char* Arguments::build_resource_string(char** args, int count) {
772 if (args == NULL || count == 0) {
773 return NULL;
774 }
775 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
776 for (int i = 1; i < count; i++) {
777 length += strlen(args[i]) + 1; // add 1 for a space
778 }
779 char* s = NEW_RESOURCE_ARRAY(char, length);
780 strcpy(s, args[0]);
781 for (int j = 1; j < count; j++) {
782 strcat(s, " ");
783 strcat(s, args[j]);
784 }
785 return (const char*) s;
786 }
788 void Arguments::print_on(outputStream* st) {
789 st->print_cr("VM Arguments:");
790 if (num_jvm_flags() > 0) {
791 st->print("jvm_flags: "); print_jvm_flags_on(st);
792 }
793 if (num_jvm_args() > 0) {
794 st->print("jvm_args: "); print_jvm_args_on(st);
795 }
796 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
797 if (_java_class_path != NULL) {
798 char* path = _java_class_path->value();
799 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
800 }
801 st->print_cr("Launcher Type: %s", _sun_java_launcher);
802 }
804 void Arguments::print_jvm_flags_on(outputStream* st) {
805 if (_num_jvm_flags > 0) {
806 for (int i=0; i < _num_jvm_flags; i++) {
807 st->print("%s ", _jvm_flags_array[i]);
808 }
809 st->print_cr("");
810 }
811 }
813 void Arguments::print_jvm_args_on(outputStream* st) {
814 if (_num_jvm_args > 0) {
815 for (int i=0; i < _num_jvm_args; i++) {
816 st->print("%s ", _jvm_args_array[i]);
817 }
818 st->print_cr("");
819 }
820 }
822 bool Arguments::process_argument(const char* arg,
823 jboolean ignore_unrecognized, FlagValueOrigin origin) {
825 JDK_Version since = JDK_Version();
827 if (parse_argument(arg, origin) || ignore_unrecognized) {
828 return true;
829 }
831 bool has_plus_minus = (*arg == '+' || *arg == '-');
832 const char* const argname = has_plus_minus ? arg + 1 : arg;
833 if (is_newly_obsolete(arg, &since)) {
834 char version[256];
835 since.to_string(version, sizeof(version));
836 warning("ignoring option %s; support was removed in %s", argname, version);
837 return true;
838 }
840 // For locked flags, report a custom error message if available.
841 // Otherwise, report the standard unrecognized VM option.
843 size_t arg_len;
844 const char* equal_sign = strchr(argname, '=');
845 if (equal_sign == NULL) {
846 arg_len = strlen(argname);
847 } else {
848 arg_len = equal_sign - argname;
849 }
851 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true);
852 if (found_flag != NULL) {
853 char locked_message_buf[BUFLEN];
854 found_flag->get_locked_message(locked_message_buf, BUFLEN);
855 if (strlen(locked_message_buf) == 0) {
856 if (found_flag->is_bool() && !has_plus_minus) {
857 jio_fprintf(defaultStream::error_stream(),
858 "Missing +/- setting for VM option '%s'\n", argname);
859 } else if (!found_flag->is_bool() && has_plus_minus) {
860 jio_fprintf(defaultStream::error_stream(),
861 "Unexpected +/- setting in VM option '%s'\n", argname);
862 } else {
863 jio_fprintf(defaultStream::error_stream(),
864 "Improperly specified VM option '%s'\n", argname);
865 }
866 } else {
867 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
868 }
869 } else {
870 jio_fprintf(defaultStream::error_stream(),
871 "Unrecognized VM option '%s'\n", argname);
872 }
874 // allow for commandline "commenting out" options like -XX:#+Verbose
875 return arg[0] == '#';
876 }
878 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
879 FILE* stream = fopen(file_name, "rb");
880 if (stream == NULL) {
881 if (should_exist) {
882 jio_fprintf(defaultStream::error_stream(),
883 "Could not open settings file %s\n", file_name);
884 return false;
885 } else {
886 return true;
887 }
888 }
890 char token[1024];
891 int pos = 0;
893 bool in_white_space = true;
894 bool in_comment = false;
895 bool in_quote = false;
896 char quote_c = 0;
897 bool result = true;
899 int c = getc(stream);
900 while(c != EOF && pos < (int)(sizeof(token)-1)) {
901 if (in_white_space) {
902 if (in_comment) {
903 if (c == '\n') in_comment = false;
904 } else {
905 if (c == '#') in_comment = true;
906 else if (!isspace(c)) {
907 in_white_space = false;
908 token[pos++] = c;
909 }
910 }
911 } else {
912 if (c == '\n' || (!in_quote && isspace(c))) {
913 // token ends at newline, or at unquoted whitespace
914 // this allows a way to include spaces in string-valued options
915 token[pos] = '\0';
916 logOption(token);
917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
918 build_jvm_flags(token);
919 pos = 0;
920 in_white_space = true;
921 in_quote = false;
922 } else if (!in_quote && (c == '\'' || c == '"')) {
923 in_quote = true;
924 quote_c = c;
925 } else if (in_quote && (c == quote_c)) {
926 in_quote = false;
927 } else {
928 token[pos++] = c;
929 }
930 }
931 c = getc(stream);
932 }
933 if (pos > 0) {
934 token[pos] = '\0';
935 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
936 build_jvm_flags(token);
937 }
938 fclose(stream);
939 return result;
940 }
942 //=============================================================================================================
943 // Parsing of properties (-D)
945 const char* Arguments::get_property(const char* key) {
946 return PropertyList_get_value(system_properties(), key);
947 }
949 bool Arguments::add_property(const char* prop) {
950 const char* eq = strchr(prop, '=');
951 char* key;
952 // ns must be static--its address may be stored in a SystemProperty object.
953 const static char ns[1] = {0};
954 char* value = (char *)ns;
956 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
957 key = AllocateHeap(key_len + 1, mtInternal);
958 strncpy(key, prop, key_len);
959 key[key_len] = '\0';
961 if (eq != NULL) {
962 size_t value_len = strlen(prop) - key_len - 1;
963 value = AllocateHeap(value_len + 1, mtInternal);
964 strncpy(value, &prop[key_len + 1], value_len + 1);
965 }
967 if (strcmp(key, "java.compiler") == 0) {
968 process_java_compiler_argument(value);
969 FreeHeap(key);
970 if (eq != NULL) {
971 FreeHeap(value);
972 }
973 return true;
974 } else if (strcmp(key, "sun.java.command") == 0) {
975 _java_command = value;
977 // Record value in Arguments, but let it get passed to Java.
978 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
979 // launcher.pid property is private and is processed
980 // in process_sun_java_launcher_properties();
981 // the sun.java.launcher property is passed on to the java application
982 FreeHeap(key);
983 if (eq != NULL) {
984 FreeHeap(value);
985 }
986 return true;
987 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
988 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
989 // its value without going through the property list or making a Java call.
990 _java_vendor_url_bug = value;
991 } else if (strcmp(key, "sun.boot.library.path") == 0) {
992 PropertyList_unique_add(&_system_properties, key, value, true);
993 return true;
994 }
995 // Create new property and add at the end of the list
996 PropertyList_unique_add(&_system_properties, key, value);
997 return true;
998 }
1000 //===========================================================================================================
1001 // Setting int/mixed/comp mode flags
1003 void Arguments::set_mode_flags(Mode mode) {
1004 // Set up default values for all flags.
1005 // If you add a flag to any of the branches below,
1006 // add a default value for it here.
1007 set_java_compiler(false);
1008 _mode = mode;
1010 // Ensure Agent_OnLoad has the correct initial values.
1011 // This may not be the final mode; mode may change later in onload phase.
1012 PropertyList_unique_add(&_system_properties, "java.vm.info",
1013 (char*)VM_Version::vm_info_string(), false);
1015 UseInterpreter = true;
1016 UseCompiler = true;
1017 UseLoopCounter = true;
1019 #ifndef ZERO
1020 // Turn these off for mixed and comp. Leave them on for Zero.
1021 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1022 UseFastAccessorMethods = (mode == _int);
1023 }
1024 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1025 UseFastEmptyMethods = (mode == _int);
1026 }
1027 #endif
1029 // Default values may be platform/compiler dependent -
1030 // use the saved values
1031 ClipInlining = Arguments::_ClipInlining;
1032 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1033 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1034 BackgroundCompilation = Arguments::_BackgroundCompilation;
1036 // Change from defaults based on mode
1037 switch (mode) {
1038 default:
1039 ShouldNotReachHere();
1040 break;
1041 case _int:
1042 UseCompiler = false;
1043 UseLoopCounter = false;
1044 AlwaysCompileLoopMethods = false;
1045 UseOnStackReplacement = false;
1046 break;
1047 case _mixed:
1048 // same as default
1049 break;
1050 case _comp:
1051 UseInterpreter = false;
1052 BackgroundCompilation = false;
1053 ClipInlining = false;
1054 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1055 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1056 // compile a level 4 (C2) and then continue executing it.
1057 if (TieredCompilation) {
1058 Tier3InvokeNotifyFreqLog = 0;
1059 Tier4InvocationThreshold = 0;
1060 }
1061 break;
1062 }
1063 }
1065 // Conflict: required to use shared spaces (-Xshare:on), but
1066 // incompatible command line options were chosen.
1068 static void no_shared_spaces() {
1069 if (RequireSharedSpaces) {
1070 jio_fprintf(defaultStream::error_stream(),
1071 "Class data sharing is inconsistent with other specified options.\n");
1072 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1073 } else {
1074 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1075 }
1076 }
1078 void Arguments::set_tiered_flags() {
1079 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1080 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1081 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1082 }
1083 if (CompilationPolicyChoice < 2) {
1084 vm_exit_during_initialization(
1085 "Incompatible compilation policy selected", NULL);
1086 }
1087 // Increase the code cache size - tiered compiles a lot more.
1088 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1089 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1090 }
1091 if (!UseInterpreter) { // -Xcomp
1092 Tier3InvokeNotifyFreqLog = 0;
1093 Tier4InvocationThreshold = 0;
1094 }
1095 }
1097 #if INCLUDE_ALL_GCS
1098 static void disable_adaptive_size_policy(const char* collector_name) {
1099 if (UseAdaptiveSizePolicy) {
1100 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1101 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1102 collector_name);
1103 }
1104 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1105 }
1106 }
1108 void Arguments::set_parnew_gc_flags() {
1109 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1110 "control point invariant");
1111 assert(UseParNewGC, "Error");
1113 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1114 disable_adaptive_size_policy("UseParNewGC");
1116 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1117 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1118 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1119 } else if (ParallelGCThreads == 0) {
1120 jio_fprintf(defaultStream::error_stream(),
1121 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1122 vm_exit(1);
1123 }
1125 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1126 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1127 // we set them to 1024 and 1024.
1128 // See CR 6362902.
1129 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1130 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1131 }
1132 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1133 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1134 }
1136 // AlwaysTenure flag should make ParNew promote all at first collection.
1137 // See CR 6362902.
1138 if (AlwaysTenure) {
1139 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1140 }
1141 // When using compressed oops, we use local overflow stacks,
1142 // rather than using a global overflow list chained through
1143 // the klass word of the object's pre-image.
1144 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1145 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1146 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1147 }
1148 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1149 }
1150 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1151 }
1153 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1154 // sparc/solaris for certain applications, but would gain from
1155 // further optimization and tuning efforts, and would almost
1156 // certainly gain from analysis of platform and environment.
1157 void Arguments::set_cms_and_parnew_gc_flags() {
1158 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1159 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1161 // If we are using CMS, we prefer to UseParNewGC,
1162 // unless explicitly forbidden.
1163 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1164 FLAG_SET_ERGO(bool, UseParNewGC, true);
1165 }
1167 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1168 disable_adaptive_size_policy("UseConcMarkSweepGC");
1170 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1171 // as needed.
1172 if (UseParNewGC) {
1173 set_parnew_gc_flags();
1174 }
1176 size_t max_heap = align_size_down(MaxHeapSize,
1177 CardTableRS::ct_max_alignment_constraint());
1179 // Now make adjustments for CMS
1180 intx tenuring_default = (intx)6;
1181 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1183 // Preferred young gen size for "short" pauses:
1184 // upper bound depends on # of threads and NewRatio.
1185 const uintx parallel_gc_threads =
1186 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1187 const size_t preferred_max_new_size_unaligned =
1188 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1189 size_t preferred_max_new_size =
1190 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1192 // Unless explicitly requested otherwise, size young gen
1193 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1195 // If either MaxNewSize or NewRatio is set on the command line,
1196 // assume the user is trying to set the size of the young gen.
1197 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1199 // Set MaxNewSize to our calculated preferred_max_new_size unless
1200 // NewSize was set on the command line and it is larger than
1201 // preferred_max_new_size.
1202 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1203 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1204 } else {
1205 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1206 }
1207 if (PrintGCDetails && Verbose) {
1208 // Too early to use gclog_or_tty
1209 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1210 }
1212 // Code along this path potentially sets NewSize and OldSize
1213 if (PrintGCDetails && Verbose) {
1214 // Too early to use gclog_or_tty
1215 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1216 " initial_heap_size: " SIZE_FORMAT
1217 " max_heap: " SIZE_FORMAT,
1218 min_heap_size(), InitialHeapSize, max_heap);
1219 }
1220 size_t min_new = preferred_max_new_size;
1221 if (FLAG_IS_CMDLINE(NewSize)) {
1222 min_new = NewSize;
1223 }
1224 if (max_heap > min_new && min_heap_size() > min_new) {
1225 // Unless explicitly requested otherwise, make young gen
1226 // at least min_new, and at most preferred_max_new_size.
1227 if (FLAG_IS_DEFAULT(NewSize)) {
1228 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1229 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1230 if (PrintGCDetails && Verbose) {
1231 // Too early to use gclog_or_tty
1232 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1233 }
1234 }
1235 // Unless explicitly requested otherwise, size old gen
1236 // so it's NewRatio x of NewSize.
1237 if (FLAG_IS_DEFAULT(OldSize)) {
1238 if (max_heap > NewSize) {
1239 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1240 if (PrintGCDetails && Verbose) {
1241 // Too early to use gclog_or_tty
1242 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1243 }
1244 }
1245 }
1246 }
1247 }
1248 // Unless explicitly requested otherwise, definitely
1249 // promote all objects surviving "tenuring_default" scavenges.
1250 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1251 FLAG_IS_DEFAULT(SurvivorRatio)) {
1252 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1253 }
1254 // If we decided above (or user explicitly requested)
1255 // `promote all' (via MaxTenuringThreshold := 0),
1256 // prefer minuscule survivor spaces so as not to waste
1257 // space for (non-existent) survivors
1258 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1259 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1260 }
1261 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1262 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1263 // This is done in order to make ParNew+CMS configuration to work
1264 // with YoungPLABSize and OldPLABSize options.
1265 // See CR 6362902.
1266 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1267 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1268 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1269 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1270 // the value (either from the command line or ergonomics) of
1271 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1272 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1273 } else {
1274 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1275 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1276 // we'll let it to take precedence.
1277 jio_fprintf(defaultStream::error_stream(),
1278 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1279 " options are specified for the CMS collector."
1280 " CMSParPromoteBlocksToClaim will take precedence.\n");
1281 }
1282 }
1283 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1284 // OldPLAB sizing manually turned off: Use a larger default setting,
1285 // unless it was manually specified. This is because a too-low value
1286 // will slow down scavenges.
1287 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1288 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1289 }
1290 }
1291 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1292 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1293 // If either of the static initialization defaults have changed, note this
1294 // modification.
1295 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1296 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1297 }
1298 if (PrintGCDetails && Verbose) {
1299 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1300 MarkStackSize / K, MarkStackSizeMax / K);
1301 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1302 }
1303 }
1304 #endif // INCLUDE_ALL_GCS
1306 void set_object_alignment() {
1307 // Object alignment.
1308 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1309 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1310 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1311 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1312 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1313 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1315 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1316 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1318 // Oop encoding heap max
1319 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1321 #if INCLUDE_ALL_GCS
1322 // Set CMS global values
1323 CompactibleFreeListSpace::set_cms_values();
1324 #endif // INCLUDE_ALL_GCS
1325 }
1327 bool verify_object_alignment() {
1328 // Object alignment.
1329 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1330 jio_fprintf(defaultStream::error_stream(),
1331 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1332 (int)ObjectAlignmentInBytes);
1333 return false;
1334 }
1335 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1336 jio_fprintf(defaultStream::error_stream(),
1337 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1338 (int)ObjectAlignmentInBytes, BytesPerLong);
1339 return false;
1340 }
1341 // It does not make sense to have big object alignment
1342 // since a space lost due to alignment will be greater
1343 // then a saved space from compressed oops.
1344 if ((int)ObjectAlignmentInBytes > 256) {
1345 jio_fprintf(defaultStream::error_stream(),
1346 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1347 (int)ObjectAlignmentInBytes);
1348 return false;
1349 }
1350 // In case page size is very small.
1351 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1352 jio_fprintf(defaultStream::error_stream(),
1353 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1354 (int)ObjectAlignmentInBytes, os::vm_page_size());
1355 return false;
1356 }
1357 return true;
1358 }
1360 inline uintx max_heap_for_compressed_oops() {
1361 // Avoid sign flip.
1362 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1363 return 0;
1364 }
1365 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1366 NOT_LP64(ShouldNotReachHere(); return 0);
1367 }
1369 bool Arguments::should_auto_select_low_pause_collector() {
1370 if (UseAutoGCSelectPolicy &&
1371 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1372 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1373 if (PrintGCDetails) {
1374 // Cannot use gclog_or_tty yet.
1375 tty->print_cr("Automatic selection of the low pause collector"
1376 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1377 }
1378 return true;
1379 }
1380 return false;
1381 }
1383 void Arguments::set_use_compressed_oops() {
1384 #ifndef ZERO
1385 #ifdef _LP64
1386 // MaxHeapSize is not set up properly at this point, but
1387 // the only value that can override MaxHeapSize if we are
1388 // to use UseCompressedOops is InitialHeapSize.
1389 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1391 if (max_heap_size <= max_heap_for_compressed_oops()) {
1392 #if !defined(COMPILER1) || defined(TIERED)
1393 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1394 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1395 }
1396 #endif
1397 #ifdef _WIN64
1398 if (UseLargePages && UseCompressedOops) {
1399 // Cannot allocate guard pages for implicit checks in indexed addressing
1400 // mode, when large pages are specified on windows.
1401 // This flag could be switched ON if narrow oop base address is set to 0,
1402 // see code in Universe::initialize_heap().
1403 Universe::set_narrow_oop_use_implicit_null_checks(false);
1404 }
1405 #endif // _WIN64
1406 } else {
1407 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1408 warning("Max heap size too large for Compressed Oops");
1409 FLAG_SET_DEFAULT(UseCompressedOops, false);
1410 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1411 }
1412 }
1413 #endif // _LP64
1414 #endif // ZERO
1415 }
1417 void Arguments::set_ergonomics_flags() {
1419 if (os::is_server_class_machine()) {
1420 // If no other collector is requested explicitly,
1421 // let the VM select the collector based on
1422 // machine class and automatic selection policy.
1423 if (!UseSerialGC &&
1424 !UseConcMarkSweepGC &&
1425 !UseG1GC &&
1426 !UseParNewGC &&
1427 FLAG_IS_DEFAULT(UseParallelGC)) {
1428 if (should_auto_select_low_pause_collector()) {
1429 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1430 } else {
1431 FLAG_SET_ERGO(bool, UseParallelGC, true);
1432 }
1433 }
1434 // Shared spaces work fine with other GCs but causes bytecode rewriting
1435 // to be disabled, which hurts interpreter performance and decreases
1436 // server performance. On server class machines, keep the default
1437 // off unless it is asked for. Future work: either add bytecode rewriting
1438 // at link time, or rewrite bytecodes in non-shared methods.
1439 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1440 no_shared_spaces();
1441 }
1442 }
1444 #ifndef ZERO
1445 #ifdef _LP64
1446 set_use_compressed_oops();
1447 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1448 if (!UseCompressedOops) {
1449 if (UseCompressedKlassPointers) {
1450 warning("UseCompressedKlassPointers requires UseCompressedOops");
1451 }
1452 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1453 } else {
1454 // Turn on UseCompressedKlassPointers too
1455 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1456 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1457 }
1458 // Set the ClassMetaspaceSize to something that will not need to be
1459 // expanded, since it cannot be expanded.
1460 if (UseCompressedKlassPointers) {
1461 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1462 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1463 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1464 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1465 // 100,000 classes seems like a good size, so 100M assumes around 1K
1466 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1467 // size per klass. Eventually, this will be parameterized because it
1468 // would also be useful to determine the optimal size of the
1469 // systemDictionary.
1470 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1471 }
1472 }
1473 }
1474 // Also checks that certain machines are slower with compressed oops
1475 // in vm_version initialization code.
1476 #endif // _LP64
1477 #endif // !ZERO
1478 }
1480 void Arguments::set_parallel_gc_flags() {
1481 assert(UseParallelGC || UseParallelOldGC, "Error");
1482 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1483 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1484 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1485 }
1486 FLAG_SET_DEFAULT(UseParallelGC, true);
1488 // If no heap maximum was requested explicitly, use some reasonable fraction
1489 // of the physical memory, up to a maximum of 1GB.
1490 FLAG_SET_DEFAULT(ParallelGCThreads,
1491 Abstract_VM_Version::parallel_worker_threads());
1492 if (ParallelGCThreads == 0) {
1493 jio_fprintf(defaultStream::error_stream(),
1494 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1495 vm_exit(1);
1496 }
1499 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1500 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1501 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1502 // See CR 6362902 for details.
1503 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1504 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1505 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1506 }
1507 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1508 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1509 }
1510 }
1512 if (UseParallelOldGC) {
1513 // Par compact uses lower default values since they are treated as
1514 // minimums. These are different defaults because of the different
1515 // interpretation and are not ergonomically set.
1516 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1517 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1518 }
1519 }
1520 }
1522 void Arguments::set_g1_gc_flags() {
1523 assert(UseG1GC, "Error");
1524 #ifdef COMPILER1
1525 FastTLABRefill = false;
1526 #endif
1527 FLAG_SET_DEFAULT(ParallelGCThreads,
1528 Abstract_VM_Version::parallel_worker_threads());
1529 if (ParallelGCThreads == 0) {
1530 FLAG_SET_DEFAULT(ParallelGCThreads,
1531 Abstract_VM_Version::parallel_worker_threads());
1532 }
1534 // MarkStackSize will be set (if it hasn't been set by the user)
1535 // when concurrent marking is initialized.
1536 // Its value will be based upon the number of parallel marking threads.
1537 // But we do set the maximum mark stack size here.
1538 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1539 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1540 }
1542 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1543 // In G1, we want the default GC overhead goal to be higher than
1544 // say in PS. So we set it here to 10%. Otherwise the heap might
1545 // be expanded more aggressively than we would like it to. In
1546 // fact, even 10% seems to not be high enough in some cases
1547 // (especially small GC stress tests that the main thing they do
1548 // is allocation). We might consider increase it further.
1549 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1550 }
1552 if (PrintGCDetails && Verbose) {
1553 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1554 MarkStackSize / K, MarkStackSizeMax / K);
1555 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1556 }
1557 }
1559 julong Arguments::limit_by_allocatable_memory(julong limit) {
1560 julong max_allocatable;
1561 julong result = limit;
1562 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1563 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1564 }
1565 return result;
1566 }
1568 void Arguments::set_heap_base_min_address() {
1569 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) {
1570 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86.
1571 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1
1572 // some extra space for the C-heap compared to other collectors.
1573 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, 1*G);
1574 }
1575 }
1577 void Arguments::set_heap_size() {
1578 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1579 // Deprecated flag
1580 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1581 }
1583 const julong phys_mem =
1584 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1585 : (julong)MaxRAM;
1587 // If the maximum heap size has not been set with -Xmx,
1588 // then set it as fraction of the size of physical memory,
1589 // respecting the maximum and minimum sizes of the heap.
1590 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1591 julong reasonable_max = phys_mem / MaxRAMFraction;
1593 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1594 // Small physical memory, so use a minimum fraction of it for the heap
1595 reasonable_max = phys_mem / MinRAMFraction;
1596 } else {
1597 // Not-small physical memory, so require a heap at least
1598 // as large as MaxHeapSize
1599 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1600 }
1601 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1602 // Limit the heap size to ErgoHeapSizeLimit
1603 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1604 }
1605 if (UseCompressedOops) {
1606 // Limit the heap size to the maximum possible when using compressed oops
1607 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1608 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1609 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1610 // but it should be not less than default MaxHeapSize.
1611 max_coop_heap -= HeapBaseMinAddress;
1612 }
1613 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1614 }
1615 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1617 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1618 // An initial heap size was specified on the command line,
1619 // so be sure that the maximum size is consistent. Done
1620 // after call to limit_by_allocatable_memory because that
1621 // method might reduce the allocation size.
1622 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1623 }
1625 if (PrintGCDetails && Verbose) {
1626 // Cannot use gclog_or_tty yet.
1627 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1628 }
1629 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1630 }
1632 // If the minimum or initial heap_size have not been set or requested to be set
1633 // ergonomically, set them accordingly.
1634 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1635 julong reasonable_minimum = (julong)(OldSize + NewSize);
1637 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1639 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1641 if (InitialHeapSize == 0) {
1642 julong reasonable_initial = phys_mem / InitialRAMFraction;
1644 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1645 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1647 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1649 if (PrintGCDetails && Verbose) {
1650 // Cannot use gclog_or_tty yet.
1651 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1652 }
1653 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1654 }
1655 // If the minimum heap size has not been set (via -Xms),
1656 // synchronize with InitialHeapSize to avoid errors with the default value.
1657 if (min_heap_size() == 0) {
1658 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1659 if (PrintGCDetails && Verbose) {
1660 // Cannot use gclog_or_tty yet.
1661 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1662 }
1663 }
1664 }
1665 }
1667 // This must be called after ergonomics because we want bytecode rewriting
1668 // if the server compiler is used, or if UseSharedSpaces is disabled.
1669 void Arguments::set_bytecode_flags() {
1670 // Better not attempt to store into a read-only space.
1671 if (UseSharedSpaces) {
1672 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1673 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1674 }
1676 if (!RewriteBytecodes) {
1677 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1678 }
1679 }
1681 // Aggressive optimization flags -XX:+AggressiveOpts
1682 void Arguments::set_aggressive_opts_flags() {
1683 #ifdef COMPILER2
1684 if (AggressiveUnboxing) {
1685 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1686 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1687 } else if (!EliminateAutoBox) {
1688 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1689 AggressiveUnboxing = false;
1690 }
1691 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1692 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1693 } else if (!DoEscapeAnalysis) {
1694 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1695 AggressiveUnboxing = false;
1696 }
1697 }
1698 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1699 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1700 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1701 }
1702 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1703 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1704 }
1706 // Feed the cache size setting into the JDK
1707 char buffer[1024];
1708 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1709 add_property(buffer);
1710 }
1711 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1712 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1713 }
1714 #endif
1716 if (AggressiveOpts) {
1717 // Sample flag setting code
1718 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1719 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1720 // }
1721 }
1722 }
1724 //===========================================================================================================
1725 // Parsing of java.compiler property
1727 void Arguments::process_java_compiler_argument(char* arg) {
1728 // For backwards compatibility, Djava.compiler=NONE or ""
1729 // causes us to switch to -Xint mode UNLESS -Xdebug
1730 // is also specified.
1731 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1732 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1733 }
1734 }
1736 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1737 _sun_java_launcher = strdup(launcher);
1738 if (strcmp("gamma", _sun_java_launcher) == 0) {
1739 _created_by_gamma_launcher = true;
1740 }
1741 }
1743 bool Arguments::created_by_java_launcher() {
1744 assert(_sun_java_launcher != NULL, "property must have value");
1745 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1746 }
1748 bool Arguments::created_by_gamma_launcher() {
1749 return _created_by_gamma_launcher;
1750 }
1752 //===========================================================================================================
1753 // Parsing of main arguments
1755 bool Arguments::verify_interval(uintx val, uintx min,
1756 uintx max, const char* name) {
1757 // Returns true iff value is in the inclusive interval [min..max]
1758 // false, otherwise.
1759 if (val >= min && val <= max) {
1760 return true;
1761 }
1762 jio_fprintf(defaultStream::error_stream(),
1763 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1764 " and " UINTX_FORMAT "\n",
1765 name, val, min, max);
1766 return false;
1767 }
1769 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1770 // Returns true if given value is at least specified min threshold
1771 // false, otherwise.
1772 if (val >= min ) {
1773 return true;
1774 }
1775 jio_fprintf(defaultStream::error_stream(),
1776 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1777 name, val, min);
1778 return false;
1779 }
1781 bool Arguments::verify_percentage(uintx value, const char* name) {
1782 if (value <= 100) {
1783 return true;
1784 }
1785 jio_fprintf(defaultStream::error_stream(),
1786 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1787 name, value);
1788 return false;
1789 }
1791 #if !INCLUDE_ALL_GCS
1792 #ifdef ASSERT
1793 static bool verify_serial_gc_flags() {
1794 return (UseSerialGC &&
1795 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1796 UseParallelGC || UseParallelOldGC));
1797 }
1798 #endif // ASSERT
1799 #endif // INCLUDE_ALL_GCS
1801 // check if do gclog rotation
1802 // +UseGCLogFileRotation is a must,
1803 // no gc log rotation when log file not supplied or
1804 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1805 void check_gclog_consistency() {
1806 if (UseGCLogFileRotation) {
1807 if ((Arguments::gc_log_filename() == NULL) ||
1808 (NumberOfGCLogFiles == 0) ||
1809 (GCLogFileSize == 0)) {
1810 jio_fprintf(defaultStream::output_stream(),
1811 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1812 "where num_of_file > 0 and num_of_size > 0\n"
1813 "GC log rotation is turned off\n");
1814 UseGCLogFileRotation = false;
1815 }
1816 }
1818 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1819 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1820 jio_fprintf(defaultStream::output_stream(),
1821 "GCLogFileSize changed to minimum 8K\n");
1822 }
1823 }
1825 // Check consistency of GC selection
1826 bool Arguments::check_gc_consistency() {
1827 check_gclog_consistency();
1828 bool status = true;
1829 // Ensure that the user has not selected conflicting sets
1830 // of collectors. [Note: this check is merely a user convenience;
1831 // collectors over-ride each other so that only a non-conflicting
1832 // set is selected; however what the user gets is not what they
1833 // may have expected from the combination they asked for. It's
1834 // better to reduce user confusion by not allowing them to
1835 // select conflicting combinations.
1836 uint i = 0;
1837 if (UseSerialGC) i++;
1838 if (UseConcMarkSweepGC || UseParNewGC) i++;
1839 if (UseParallelGC || UseParallelOldGC) i++;
1840 if (UseG1GC) i++;
1841 if (i > 1) {
1842 jio_fprintf(defaultStream::error_stream(),
1843 "Conflicting collector combinations in option list; "
1844 "please refer to the release notes for the combinations "
1845 "allowed\n");
1846 status = false;
1847 }
1849 return status;
1850 }
1852 void Arguments::check_deprecated_gcs() {
1853 if (UseConcMarkSweepGC && !UseParNewGC) {
1854 warning("Using the DefNew young collector with the CMS collector is deprecated "
1855 "and will likely be removed in a future release");
1856 }
1858 if (UseParNewGC && !UseConcMarkSweepGC) {
1859 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1860 // set up UseSerialGC properly, so that can't be used in the check here.
1861 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1862 "and will likely be removed in a future release");
1863 }
1865 if (CMSIncrementalMode) {
1866 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1867 }
1868 }
1870 void Arguments::check_deprecated_gc_flags() {
1871 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1872 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1873 "and will likely be removed in future release");
1874 }
1875 }
1877 // Check stack pages settings
1878 bool Arguments::check_stack_pages()
1879 {
1880 bool status = true;
1881 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1882 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1883 // greater stack shadow pages can't generate instruction to bang stack
1884 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1885 return status;
1886 }
1888 // Check the consistency of vm_init_args
1889 bool Arguments::check_vm_args_consistency() {
1890 // Method for adding checks for flag consistency.
1891 // The intent is to warn the user of all possible conflicts,
1892 // before returning an error.
1893 // Note: Needs platform-dependent factoring.
1894 bool status = true;
1896 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1897 // builds so the cost of stack banging can be measured.
1898 #if (defined(PRODUCT) && defined(SOLARIS))
1899 if (!UseBoundThreads && !UseStackBanging) {
1900 jio_fprintf(defaultStream::error_stream(),
1901 "-UseStackBanging conflicts with -UseBoundThreads\n");
1903 status = false;
1904 }
1905 #endif
1907 if (TLABRefillWasteFraction == 0) {
1908 jio_fprintf(defaultStream::error_stream(),
1909 "TLABRefillWasteFraction should be a denominator, "
1910 "not " SIZE_FORMAT "\n",
1911 TLABRefillWasteFraction);
1912 status = false;
1913 }
1915 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1916 "AdaptiveSizePolicyWeight");
1917 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1918 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1919 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1921 // Divide by bucket size to prevent a large size from causing rollover when
1922 // calculating amount of memory needed to be allocated for the String table.
1923 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1924 (max_uintx / StringTable::bucket_size()), "StringTable size");
1926 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1927 jio_fprintf(defaultStream::error_stream(),
1928 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1929 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1930 MinHeapFreeRatio, MaxHeapFreeRatio);
1931 status = false;
1932 }
1933 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1934 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1936 // Min/MaxMetaspaceFreeRatio
1937 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1938 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1940 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1941 jio_fprintf(defaultStream::error_stream(),
1942 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1943 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1944 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1945 MinMetaspaceFreeRatio,
1946 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1947 MaxMetaspaceFreeRatio);
1948 status = false;
1949 }
1951 // Trying to keep 100% free is not practical
1952 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1954 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1955 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1956 }
1958 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1959 // Settings to encourage splitting.
1960 if (!FLAG_IS_CMDLINE(NewRatio)) {
1961 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1962 }
1963 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1964 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1965 }
1966 }
1968 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1969 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1970 if (GCTimeLimit == 100) {
1971 // Turn off gc-overhead-limit-exceeded checks
1972 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1973 }
1975 status = status && check_gc_consistency();
1976 status = status && check_stack_pages();
1978 if (CMSIncrementalMode) {
1979 if (!UseConcMarkSweepGC) {
1980 jio_fprintf(defaultStream::error_stream(),
1981 "error: invalid argument combination.\n"
1982 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1983 "selected in order\nto use CMSIncrementalMode.\n");
1984 status = false;
1985 } else {
1986 status = status && verify_percentage(CMSIncrementalDutyCycle,
1987 "CMSIncrementalDutyCycle");
1988 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1989 "CMSIncrementalDutyCycleMin");
1990 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1991 "CMSIncrementalSafetyFactor");
1992 status = status && verify_percentage(CMSIncrementalOffset,
1993 "CMSIncrementalOffset");
1994 status = status && verify_percentage(CMSExpAvgFactor,
1995 "CMSExpAvgFactor");
1996 // If it was not set on the command line, set
1997 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1998 if (CMSInitiatingOccupancyFraction < 0) {
1999 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2000 }
2001 }
2002 }
2004 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2005 // insists that we hold the requisite locks so that the iteration is
2006 // MT-safe. For the verification at start-up and shut-down, we don't
2007 // yet have a good way of acquiring and releasing these locks,
2008 // which are not visible at the CollectedHeap level. We want to
2009 // be able to acquire these locks and then do the iteration rather
2010 // than just disable the lock verification. This will be fixed under
2011 // bug 4788986.
2012 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2013 if (VerifyDuringStartup) {
2014 warning("Heap verification at start-up disabled "
2015 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2016 VerifyDuringStartup = false; // Disable verification at start-up
2017 }
2019 if (VerifyBeforeExit) {
2020 warning("Heap verification at shutdown disabled "
2021 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2022 VerifyBeforeExit = false; // Disable verification at shutdown
2023 }
2024 }
2026 // Note: only executed in non-PRODUCT mode
2027 if (!UseAsyncConcMarkSweepGC &&
2028 (ExplicitGCInvokesConcurrent ||
2029 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2030 jio_fprintf(defaultStream::error_stream(),
2031 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2032 " with -UseAsyncConcMarkSweepGC");
2033 status = false;
2034 }
2036 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2038 #if INCLUDE_ALL_GCS
2039 if (UseG1GC) {
2040 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2041 "InitiatingHeapOccupancyPercent");
2042 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2043 "G1RefProcDrainInterval");
2044 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2045 "G1ConcMarkStepDurationMillis");
2046 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2047 "G1ConcRSHotCardLimit");
2048 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2049 "G1ConcRSLogCacheSize");
2050 }
2051 if (UseConcMarkSweepGC) {
2052 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2053 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2054 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2055 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2057 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2059 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2060 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2061 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2063 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2065 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2066 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2068 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2069 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2070 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2072 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2074 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2076 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2077 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2078 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2079 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2080 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2081 }
2083 if (UseParallelGC || UseParallelOldGC) {
2084 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2085 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2087 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2088 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2090 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2091 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2093 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2095 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2096 }
2097 #endif // INCLUDE_ALL_GCS
2099 status = status && verify_interval(RefDiscoveryPolicy,
2100 ReferenceProcessor::DiscoveryPolicyMin,
2101 ReferenceProcessor::DiscoveryPolicyMax,
2102 "RefDiscoveryPolicy");
2104 // Limit the lower bound of this flag to 1 as it is used in a division
2105 // expression.
2106 status = status && verify_interval(TLABWasteTargetPercent,
2107 1, 100, "TLABWasteTargetPercent");
2109 status = status && verify_object_alignment();
2111 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2112 "ClassMetaspaceSize");
2114 status = status && verify_interval(MarkStackSizeMax,
2115 1, (max_jint - 1), "MarkStackSizeMax");
2116 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2118 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2120 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2122 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2124 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2125 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2127 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2129 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2130 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2131 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2132 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2134 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2135 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2137 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2138 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2139 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2141 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2142 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2144 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2145 // just for that, so hardcode here.
2146 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2147 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2148 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2149 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2151 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2152 #ifdef SPARC
2153 if (UseConcMarkSweepGC || UseG1GC) {
2154 // Issue a stern warning if the user has explicitly set
2155 // UseMemSetInBOT (it is known to cause issues), but allow
2156 // use for experimentation and debugging.
2157 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2158 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2159 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2160 " on sun4v; please understand that you are using at your own risk!");
2161 }
2162 }
2163 #endif // SPARC
2165 if (PrintNMTStatistics) {
2166 #if INCLUDE_NMT
2167 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2168 #endif // INCLUDE_NMT
2169 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2170 PrintNMTStatistics = false;
2171 #if INCLUDE_NMT
2172 }
2173 #endif
2174 }
2176 // Need to limit the extent of the padding to reasonable size.
2177 // 8K is well beyond the reasonable HW cache line size, even with the
2178 // aggressive prefetching, while still leaving the room for segregating
2179 // among the distinct pages.
2180 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2181 jio_fprintf(defaultStream::error_stream(),
2182 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2183 ContendedPaddingWidth, 0, 8192);
2184 status = false;
2185 }
2187 // Need to enforce the padding not to break the existing field alignments.
2188 // It is sufficient to check against the largest type size.
2189 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2190 jio_fprintf(defaultStream::error_stream(),
2191 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2192 ContendedPaddingWidth, BytesPerLong);
2193 status = false;
2194 }
2196 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2197 jio_fprintf(defaultStream::error_stream(),
2198 "Invalid ReservedCodeCacheSize: %dK. Should be greater than InitialCodeCacheSize=%dK\n",
2199 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2200 status = false;
2201 }
2203 return status;
2204 }
2206 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2207 const char* option_type) {
2208 if (ignore) return false;
2210 const char* spacer = " ";
2211 if (option_type == NULL) {
2212 option_type = ++spacer; // Set both to the empty string.
2213 }
2215 if (os::obsolete_option(option)) {
2216 jio_fprintf(defaultStream::error_stream(),
2217 "Obsolete %s%soption: %s\n", option_type, spacer,
2218 option->optionString);
2219 return false;
2220 } else {
2221 jio_fprintf(defaultStream::error_stream(),
2222 "Unrecognized %s%soption: %s\n", option_type, spacer,
2223 option->optionString);
2224 return true;
2225 }
2226 }
2228 static const char* user_assertion_options[] = {
2229 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2230 };
2232 static const char* system_assertion_options[] = {
2233 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2234 };
2236 // Return true if any of the strings in null-terminated array 'names' matches.
2237 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2238 // the option must match exactly.
2239 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2240 bool tail_allowed) {
2241 for (/* empty */; *names != NULL; ++names) {
2242 if (match_option(option, *names, tail)) {
2243 if (**tail == '\0' || tail_allowed && **tail == ':') {
2244 return true;
2245 }
2246 }
2247 }
2248 return false;
2249 }
2251 bool Arguments::parse_uintx(const char* value,
2252 uintx* uintx_arg,
2253 uintx min_size) {
2255 // Check the sign first since atomull() parses only unsigned values.
2256 bool value_is_positive = !(*value == '-');
2258 if (value_is_positive) {
2259 julong n;
2260 bool good_return = atomull(value, &n);
2261 if (good_return) {
2262 bool above_minimum = n >= min_size;
2263 bool value_is_too_large = n > max_uintx;
2265 if (above_minimum && !value_is_too_large) {
2266 *uintx_arg = n;
2267 return true;
2268 }
2269 }
2270 }
2271 return false;
2272 }
2274 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2275 julong* long_arg,
2276 julong min_size) {
2277 if (!atomull(s, long_arg)) return arg_unreadable;
2278 return check_memory_size(*long_arg, min_size);
2279 }
2281 // Parse JavaVMInitArgs structure
2283 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2284 // For components of the system classpath.
2285 SysClassPath scp(Arguments::get_sysclasspath());
2286 bool scp_assembly_required = false;
2288 // Save default settings for some mode flags
2289 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2290 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2291 Arguments::_ClipInlining = ClipInlining;
2292 Arguments::_BackgroundCompilation = BackgroundCompilation;
2294 // Setup flags for mixed which is the default
2295 set_mode_flags(_mixed);
2297 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2298 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2299 if (result != JNI_OK) {
2300 return result;
2301 }
2303 // Parse JavaVMInitArgs structure passed in
2304 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2305 if (result != JNI_OK) {
2306 return result;
2307 }
2309 if (AggressiveOpts) {
2310 // Insert alt-rt.jar between user-specified bootclasspath
2311 // prefix and the default bootclasspath. os::set_boot_path()
2312 // uses meta_index_dir as the default bootclasspath directory.
2313 const char* altclasses_jar = "alt-rt.jar";
2314 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2315 strlen(altclasses_jar);
2316 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2317 strcpy(altclasses_path, get_meta_index_dir());
2318 strcat(altclasses_path, altclasses_jar);
2319 scp.add_suffix_to_prefix(altclasses_path);
2320 scp_assembly_required = true;
2321 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2322 }
2324 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2325 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2326 if (result != JNI_OK) {
2327 return result;
2328 }
2330 // Do final processing now that all arguments have been parsed
2331 result = finalize_vm_init_args(&scp, scp_assembly_required);
2332 if (result != JNI_OK) {
2333 return result;
2334 }
2336 return JNI_OK;
2337 }
2339 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2340 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2341 // are dealing with -agentpath (case where name is a path), otherwise with
2342 // -agentlib
2343 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2344 char *_name;
2345 const char *_hprof = "hprof", *_jdwp = "jdwp";
2346 size_t _len_hprof, _len_jdwp, _len_prefix;
2348 if (is_path) {
2349 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2350 return false;
2351 }
2353 _name++; // skip past last path separator
2354 _len_prefix = strlen(JNI_LIB_PREFIX);
2356 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2357 return false;
2358 }
2360 _name += _len_prefix;
2361 _len_hprof = strlen(_hprof);
2362 _len_jdwp = strlen(_jdwp);
2364 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2365 _name += _len_hprof;
2366 }
2367 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2368 _name += _len_jdwp;
2369 }
2370 else {
2371 return false;
2372 }
2374 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2375 return false;
2376 }
2378 return true;
2379 }
2381 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2382 return true;
2383 }
2385 return false;
2386 }
2388 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2389 SysClassPath* scp_p,
2390 bool* scp_assembly_required_p,
2391 FlagValueOrigin origin) {
2392 // Remaining part of option string
2393 const char* tail;
2395 // iterate over arguments
2396 for (int index = 0; index < args->nOptions; index++) {
2397 bool is_absolute_path = false; // for -agentpath vs -agentlib
2399 const JavaVMOption* option = args->options + index;
2401 if (!match_option(option, "-Djava.class.path", &tail) &&
2402 !match_option(option, "-Dsun.java.command", &tail) &&
2403 !match_option(option, "-Dsun.java.launcher", &tail)) {
2405 // add all jvm options to the jvm_args string. This string
2406 // is used later to set the java.vm.args PerfData string constant.
2407 // the -Djava.class.path and the -Dsun.java.command options are
2408 // omitted from jvm_args string as each have their own PerfData
2409 // string constant object.
2410 build_jvm_args(option->optionString);
2411 }
2413 // -verbose:[class/gc/jni]
2414 if (match_option(option, "-verbose", &tail)) {
2415 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2416 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2417 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2418 } else if (!strcmp(tail, ":gc")) {
2419 FLAG_SET_CMDLINE(bool, PrintGC, true);
2420 } else if (!strcmp(tail, ":jni")) {
2421 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2422 }
2423 // -da / -ea / -disableassertions / -enableassertions
2424 // These accept an optional class/package name separated by a colon, e.g.,
2425 // -da:java.lang.Thread.
2426 } else if (match_option(option, user_assertion_options, &tail, true)) {
2427 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2428 if (*tail == '\0') {
2429 JavaAssertions::setUserClassDefault(enable);
2430 } else {
2431 assert(*tail == ':', "bogus match by match_option()");
2432 JavaAssertions::addOption(tail + 1, enable);
2433 }
2434 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2435 } else if (match_option(option, system_assertion_options, &tail, false)) {
2436 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2437 JavaAssertions::setSystemClassDefault(enable);
2438 // -bootclasspath:
2439 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2440 scp_p->reset_path(tail);
2441 *scp_assembly_required_p = true;
2442 // -bootclasspath/a:
2443 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2444 scp_p->add_suffix(tail);
2445 *scp_assembly_required_p = true;
2446 // -bootclasspath/p:
2447 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2448 scp_p->add_prefix(tail);
2449 *scp_assembly_required_p = true;
2450 // -Xrun
2451 } else if (match_option(option, "-Xrun", &tail)) {
2452 if (tail != NULL) {
2453 const char* pos = strchr(tail, ':');
2454 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2455 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2456 name[len] = '\0';
2458 char *options = NULL;
2459 if(pos != NULL) {
2460 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2461 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2462 }
2463 #if !INCLUDE_JVMTI
2464 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2465 jio_fprintf(defaultStream::error_stream(),
2466 "Profiling and debugging agents are not supported in this VM\n");
2467 return JNI_ERR;
2468 }
2469 #endif // !INCLUDE_JVMTI
2470 add_init_library(name, options);
2471 }
2472 // -agentlib and -agentpath
2473 } else if (match_option(option, "-agentlib:", &tail) ||
2474 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2475 if(tail != NULL) {
2476 const char* pos = strchr(tail, '=');
2477 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2478 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2479 name[len] = '\0';
2481 char *options = NULL;
2482 if(pos != NULL) {
2483 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2484 }
2485 #if !INCLUDE_JVMTI
2486 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2487 jio_fprintf(defaultStream::error_stream(),
2488 "Profiling and debugging agents are not supported in this VM\n");
2489 return JNI_ERR;
2490 }
2491 #endif // !INCLUDE_JVMTI
2492 add_init_agent(name, options, is_absolute_path);
2493 }
2494 // -javaagent
2495 } else if (match_option(option, "-javaagent:", &tail)) {
2496 #if !INCLUDE_JVMTI
2497 jio_fprintf(defaultStream::error_stream(),
2498 "Instrumentation agents are not supported in this VM\n");
2499 return JNI_ERR;
2500 #else
2501 if(tail != NULL) {
2502 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2503 add_init_agent("instrument", options, false);
2504 }
2505 #endif // !INCLUDE_JVMTI
2506 // -Xnoclassgc
2507 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2508 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2509 // -Xincgc: i-CMS
2510 } else if (match_option(option, "-Xincgc", &tail)) {
2511 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2512 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2513 // -Xnoincgc: no i-CMS
2514 } else if (match_option(option, "-Xnoincgc", &tail)) {
2515 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2516 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2517 // -Xconcgc
2518 } else if (match_option(option, "-Xconcgc", &tail)) {
2519 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2520 // -Xnoconcgc
2521 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2522 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2523 // -Xbatch
2524 } else if (match_option(option, "-Xbatch", &tail)) {
2525 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2526 // -Xmn for compatibility with other JVM vendors
2527 } else if (match_option(option, "-Xmn", &tail)) {
2528 julong long_initial_eden_size = 0;
2529 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2530 if (errcode != arg_in_range) {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Invalid initial eden size: %s\n", option->optionString);
2533 describe_range_error(errcode);
2534 return JNI_EINVAL;
2535 }
2536 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2537 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2538 // -Xms
2539 } else if (match_option(option, "-Xms", &tail)) {
2540 julong long_initial_heap_size = 0;
2541 // an initial heap size of 0 means automatically determine
2542 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2543 if (errcode != arg_in_range) {
2544 jio_fprintf(defaultStream::error_stream(),
2545 "Invalid initial heap size: %s\n", option->optionString);
2546 describe_range_error(errcode);
2547 return JNI_EINVAL;
2548 }
2549 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2550 // Currently the minimum size and the initial heap sizes are the same.
2551 set_min_heap_size(InitialHeapSize);
2552 // -Xmx
2553 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2554 julong long_max_heap_size = 0;
2555 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2556 if (errcode != arg_in_range) {
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Invalid maximum heap size: %s\n", option->optionString);
2559 describe_range_error(errcode);
2560 return JNI_EINVAL;
2561 }
2562 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2563 // Xmaxf
2564 } else if (match_option(option, "-Xmaxf", &tail)) {
2565 int maxf = (int)(atof(tail) * 100);
2566 if (maxf < 0 || maxf > 100) {
2567 jio_fprintf(defaultStream::error_stream(),
2568 "Bad max heap free percentage size: %s\n",
2569 option->optionString);
2570 return JNI_EINVAL;
2571 } else {
2572 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2573 }
2574 // Xminf
2575 } else if (match_option(option, "-Xminf", &tail)) {
2576 int minf = (int)(atof(tail) * 100);
2577 if (minf < 0 || minf > 100) {
2578 jio_fprintf(defaultStream::error_stream(),
2579 "Bad min heap free percentage size: %s\n",
2580 option->optionString);
2581 return JNI_EINVAL;
2582 } else {
2583 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2584 }
2585 // -Xss
2586 } else if (match_option(option, "-Xss", &tail)) {
2587 julong long_ThreadStackSize = 0;
2588 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2589 if (errcode != arg_in_range) {
2590 jio_fprintf(defaultStream::error_stream(),
2591 "Invalid thread stack size: %s\n", option->optionString);
2592 describe_range_error(errcode);
2593 return JNI_EINVAL;
2594 }
2595 // Internally track ThreadStackSize in units of 1024 bytes.
2596 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2597 round_to((int)long_ThreadStackSize, K) / K);
2598 // -Xoss
2599 } else if (match_option(option, "-Xoss", &tail)) {
2600 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2601 // -Xmaxjitcodesize
2602 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2603 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2604 julong long_ReservedCodeCacheSize = 0;
2605 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2606 if (errcode != arg_in_range) {
2607 jio_fprintf(defaultStream::error_stream(),
2608 "Invalid maximum code cache size: %s.\n", option->optionString);
2609 return JNI_EINVAL;
2610 }
2611 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2612 //-XX:IncreaseFirstTierCompileThresholdAt=
2613 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2614 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2615 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2616 jio_fprintf(defaultStream::error_stream(),
2617 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2618 option->optionString);
2619 return JNI_EINVAL;
2620 }
2621 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2622 // -green
2623 } else if (match_option(option, "-green", &tail)) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Green threads support not available\n");
2626 return JNI_EINVAL;
2627 // -native
2628 } else if (match_option(option, "-native", &tail)) {
2629 // HotSpot always uses native threads, ignore silently for compatibility
2630 // -Xsqnopause
2631 } else if (match_option(option, "-Xsqnopause", &tail)) {
2632 // EVM option, ignore silently for compatibility
2633 // -Xrs
2634 } else if (match_option(option, "-Xrs", &tail)) {
2635 // Classic/EVM option, new functionality
2636 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2637 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2638 // change default internal VM signals used - lower case for back compat
2639 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2640 // -Xoptimize
2641 } else if (match_option(option, "-Xoptimize", &tail)) {
2642 // EVM option, ignore silently for compatibility
2643 // -Xprof
2644 } else if (match_option(option, "-Xprof", &tail)) {
2645 #if INCLUDE_FPROF
2646 _has_profile = true;
2647 #else // INCLUDE_FPROF
2648 jio_fprintf(defaultStream::error_stream(),
2649 "Flat profiling is not supported in this VM.\n");
2650 return JNI_ERR;
2651 #endif // INCLUDE_FPROF
2652 // -Xconcurrentio
2653 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2654 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2655 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2656 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2657 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2658 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2660 // -Xinternalversion
2661 } else if (match_option(option, "-Xinternalversion", &tail)) {
2662 jio_fprintf(defaultStream::output_stream(), "%s\n",
2663 VM_Version::internal_vm_info_string());
2664 vm_exit(0);
2665 #ifndef PRODUCT
2666 // -Xprintflags
2667 } else if (match_option(option, "-Xprintflags", &tail)) {
2668 CommandLineFlags::printFlags(tty, false);
2669 vm_exit(0);
2670 #endif
2671 // -D
2672 } else if (match_option(option, "-D", &tail)) {
2673 if (!add_property(tail)) {
2674 return JNI_ENOMEM;
2675 }
2676 // Out of the box management support
2677 if (match_option(option, "-Dcom.sun.management", &tail)) {
2678 #if INCLUDE_MANAGEMENT
2679 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2680 #else
2681 jio_fprintf(defaultStream::output_stream(),
2682 "-Dcom.sun.management is not supported in this VM.\n");
2683 return JNI_ERR;
2684 #endif
2685 }
2686 // -Xint
2687 } else if (match_option(option, "-Xint", &tail)) {
2688 set_mode_flags(_int);
2689 // -Xmixed
2690 } else if (match_option(option, "-Xmixed", &tail)) {
2691 set_mode_flags(_mixed);
2692 // -Xcomp
2693 } else if (match_option(option, "-Xcomp", &tail)) {
2694 // for testing the compiler; turn off all flags that inhibit compilation
2695 set_mode_flags(_comp);
2696 // -Xshare:dump
2697 } else if (match_option(option, "-Xshare:dump", &tail)) {
2698 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2699 set_mode_flags(_int); // Prevent compilation, which creates objects
2700 // -Xshare:on
2701 } else if (match_option(option, "-Xshare:on", &tail)) {
2702 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2703 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2704 // -Xshare:auto
2705 } else if (match_option(option, "-Xshare:auto", &tail)) {
2706 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2707 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2708 // -Xshare:off
2709 } else if (match_option(option, "-Xshare:off", &tail)) {
2710 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2711 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2712 // -Xverify
2713 } else if (match_option(option, "-Xverify", &tail)) {
2714 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2715 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2716 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2717 } else if (strcmp(tail, ":remote") == 0) {
2718 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2719 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2720 } else if (strcmp(tail, ":none") == 0) {
2721 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2722 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2723 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2724 return JNI_EINVAL;
2725 }
2726 // -Xdebug
2727 } else if (match_option(option, "-Xdebug", &tail)) {
2728 // note this flag has been used, then ignore
2729 set_xdebug_mode(true);
2730 // -Xnoagent
2731 } else if (match_option(option, "-Xnoagent", &tail)) {
2732 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2733 } else if (match_option(option, "-Xboundthreads", &tail)) {
2734 // Bind user level threads to kernel threads (Solaris only)
2735 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2736 } else if (match_option(option, "-Xloggc:", &tail)) {
2737 // Redirect GC output to the file. -Xloggc:<filename>
2738 // ostream_init_log(), when called will use this filename
2739 // to initialize a fileStream.
2740 _gc_log_filename = strdup(tail);
2741 FLAG_SET_CMDLINE(bool, PrintGC, true);
2742 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2744 // JNI hooks
2745 } else if (match_option(option, "-Xcheck", &tail)) {
2746 if (!strcmp(tail, ":jni")) {
2747 #if !INCLUDE_JNI_CHECK
2748 warning("JNI CHECKING is not supported in this VM");
2749 #else
2750 CheckJNICalls = true;
2751 #endif // INCLUDE_JNI_CHECK
2752 } else if (is_bad_option(option, args->ignoreUnrecognized,
2753 "check")) {
2754 return JNI_EINVAL;
2755 }
2756 } else if (match_option(option, "vfprintf", &tail)) {
2757 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2758 } else if (match_option(option, "exit", &tail)) {
2759 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2760 } else if (match_option(option, "abort", &tail)) {
2761 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2762 // -XX:+AggressiveHeap
2763 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2765 // This option inspects the machine and attempts to set various
2766 // parameters to be optimal for long-running, memory allocation
2767 // intensive jobs. It is intended for machines with large
2768 // amounts of cpu and memory.
2770 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2771 // VM, but we may not be able to represent the total physical memory
2772 // available (like having 8gb of memory on a box but using a 32bit VM).
2773 // Thus, we need to make sure we're using a julong for intermediate
2774 // calculations.
2775 julong initHeapSize;
2776 julong total_memory = os::physical_memory();
2778 if (total_memory < (julong)256*M) {
2779 jio_fprintf(defaultStream::error_stream(),
2780 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2781 vm_exit(1);
2782 }
2784 // The heap size is half of available memory, or (at most)
2785 // all of possible memory less 160mb (leaving room for the OS
2786 // when using ISM). This is the maximum; because adaptive sizing
2787 // is turned on below, the actual space used may be smaller.
2789 initHeapSize = MIN2(total_memory / (julong)2,
2790 total_memory - (julong)160*M);
2792 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2794 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2795 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2796 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2797 // Currently the minimum size and the initial heap sizes are the same.
2798 set_min_heap_size(initHeapSize);
2799 }
2800 if (FLAG_IS_DEFAULT(NewSize)) {
2801 // Make the young generation 3/8ths of the total heap.
2802 FLAG_SET_CMDLINE(uintx, NewSize,
2803 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2804 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2805 }
2807 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2808 FLAG_SET_DEFAULT(UseLargePages, true);
2809 #endif
2811 // Increase some data structure sizes for efficiency
2812 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2813 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2814 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2816 // See the OldPLABSize comment below, but replace 'after promotion'
2817 // with 'after copying'. YoungPLABSize is the size of the survivor
2818 // space per-gc-thread buffers. The default is 4kw.
2819 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2821 // OldPLABSize is the size of the buffers in the old gen that
2822 // UseParallelGC uses to promote live data that doesn't fit in the
2823 // survivor spaces. At any given time, there's one for each gc thread.
2824 // The default size is 1kw. These buffers are rarely used, since the
2825 // survivor spaces are usually big enough. For specjbb, however, there
2826 // are occasions when there's lots of live data in the young gen
2827 // and we end up promoting some of it. We don't have a definite
2828 // explanation for why bumping OldPLABSize helps, but the theory
2829 // is that a bigger PLAB results in retaining something like the
2830 // original allocation order after promotion, which improves mutator
2831 // locality. A minor effect may be that larger PLABs reduce the
2832 // number of PLAB allocation events during gc. The value of 8kw
2833 // was arrived at by experimenting with specjbb.
2834 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2836 // Enable parallel GC and adaptive generation sizing
2837 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2838 FLAG_SET_DEFAULT(ParallelGCThreads,
2839 Abstract_VM_Version::parallel_worker_threads());
2841 // Encourage steady state memory management
2842 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2844 // This appears to improve mutator locality
2845 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2847 // Get around early Solaris scheduling bug
2848 // (affinity vs other jobs on system)
2849 // but disallow DR and offlining (5008695).
2850 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2852 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2853 // The last option must always win.
2854 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2855 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2856 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2857 // The last option must always win.
2858 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2859 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2860 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2861 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Please use CMSClassUnloadingEnabled in place of "
2864 "CMSPermGenSweepingEnabled in the future\n");
2865 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2866 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Please use -XX:+UseGCOverheadLimit in place of "
2869 "-XX:+UseGCTimeLimit in the future\n");
2870 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2871 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2872 jio_fprintf(defaultStream::error_stream(),
2873 "Please use -XX:-UseGCOverheadLimit in place of "
2874 "-XX:-UseGCTimeLimit in the future\n");
2875 // The TLE options are for compatibility with 1.3 and will be
2876 // removed without notice in a future release. These options
2877 // are not to be documented.
2878 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2879 // No longer used.
2880 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2881 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2882 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2883 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2884 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2885 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2886 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2887 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2888 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2889 // No longer used.
2890 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2891 julong long_tlab_size = 0;
2892 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2893 if (errcode != arg_in_range) {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Invalid TLAB size: %s\n", option->optionString);
2896 describe_range_error(errcode);
2897 return JNI_EINVAL;
2898 }
2899 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2900 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2901 // No longer used.
2902 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2903 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2904 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2905 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2906 SOLARIS_ONLY(
2907 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2908 warning("-XX:+UsePermISM is obsolete.");
2909 FLAG_SET_CMDLINE(bool, UseISM, true);
2910 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2911 FLAG_SET_CMDLINE(bool, UseISM, false);
2912 )
2913 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2914 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2915 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2916 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2917 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2918 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2919 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2920 #if defined(DTRACE_ENABLED)
2921 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2922 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2923 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2924 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2925 #else // defined(DTRACE_ENABLED)
2926 jio_fprintf(defaultStream::error_stream(),
2927 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2928 return JNI_EINVAL;
2929 #endif // defined(DTRACE_ENABLED)
2930 #ifdef ASSERT
2931 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2932 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2933 // disable scavenge before parallel mark-compact
2934 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2935 #endif
2936 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2937 julong cms_blocks_to_claim = (julong)atol(tail);
2938 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2939 jio_fprintf(defaultStream::error_stream(),
2940 "Please use -XX:OldPLABSize in place of "
2941 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2942 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2943 julong cms_blocks_to_claim = (julong)atol(tail);
2944 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2945 jio_fprintf(defaultStream::error_stream(),
2946 "Please use -XX:OldPLABSize in place of "
2947 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2948 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2949 julong old_plab_size = 0;
2950 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2951 if (errcode != arg_in_range) {
2952 jio_fprintf(defaultStream::error_stream(),
2953 "Invalid old PLAB size: %s\n", option->optionString);
2954 describe_range_error(errcode);
2955 return JNI_EINVAL;
2956 }
2957 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2958 jio_fprintf(defaultStream::error_stream(),
2959 "Please use -XX:OldPLABSize in place of "
2960 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2961 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2962 julong young_plab_size = 0;
2963 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2964 if (errcode != arg_in_range) {
2965 jio_fprintf(defaultStream::error_stream(),
2966 "Invalid young PLAB size: %s\n", option->optionString);
2967 describe_range_error(errcode);
2968 return JNI_EINVAL;
2969 }
2970 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2971 jio_fprintf(defaultStream::error_stream(),
2972 "Please use -XX:YoungPLABSize in place of "
2973 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2974 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2975 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2976 julong stack_size = 0;
2977 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2978 if (errcode != arg_in_range) {
2979 jio_fprintf(defaultStream::error_stream(),
2980 "Invalid mark stack size: %s\n", option->optionString);
2981 describe_range_error(errcode);
2982 return JNI_EINVAL;
2983 }
2984 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2985 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2986 julong max_stack_size = 0;
2987 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2988 if (errcode != arg_in_range) {
2989 jio_fprintf(defaultStream::error_stream(),
2990 "Invalid maximum mark stack size: %s\n",
2991 option->optionString);
2992 describe_range_error(errcode);
2993 return JNI_EINVAL;
2994 }
2995 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2996 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2997 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2998 uintx conc_threads = 0;
2999 if (!parse_uintx(tail, &conc_threads, 1)) {
3000 jio_fprintf(defaultStream::error_stream(),
3001 "Invalid concurrent threads: %s\n", option->optionString);
3002 return JNI_EINVAL;
3003 }
3004 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3005 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3006 julong max_direct_memory_size = 0;
3007 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3008 if (errcode != arg_in_range) {
3009 jio_fprintf(defaultStream::error_stream(),
3010 "Invalid maximum direct memory size: %s\n",
3011 option->optionString);
3012 describe_range_error(errcode);
3013 return JNI_EINVAL;
3014 }
3015 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3016 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3017 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3018 // away and will cause VM initialization failures!
3019 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3020 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3021 #if !INCLUDE_MANAGEMENT
3022 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3023 jio_fprintf(defaultStream::error_stream(),
3024 "ManagementServer is not supported in this VM.\n");
3025 return JNI_ERR;
3026 #endif // INCLUDE_MANAGEMENT
3027 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3028 // Skip -XX:Flags= since that case has already been handled
3029 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3030 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3031 return JNI_EINVAL;
3032 }
3033 }
3034 // Unknown option
3035 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3036 return JNI_ERR;
3037 }
3038 }
3040 // Change the default value for flags which have different default values
3041 // when working with older JDKs.
3042 #ifdef LINUX
3043 if (JDK_Version::current().compare_major(6) <= 0 &&
3044 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3045 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3046 }
3047 #endif // LINUX
3048 return JNI_OK;
3049 }
3051 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3052 // This must be done after all -D arguments have been processed.
3053 scp_p->expand_endorsed();
3055 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3056 // Assemble the bootclasspath elements into the final path.
3057 Arguments::set_sysclasspath(scp_p->combined_path());
3058 }
3060 // This must be done after all arguments have been processed.
3061 // java_compiler() true means set to "NONE" or empty.
3062 if (java_compiler() && !xdebug_mode()) {
3063 // For backwards compatibility, we switch to interpreted mode if
3064 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3065 // not specified.
3066 set_mode_flags(_int);
3067 }
3068 if (CompileThreshold == 0) {
3069 set_mode_flags(_int);
3070 }
3072 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3073 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3074 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3075 }
3077 #ifndef COMPILER2
3078 // Don't degrade server performance for footprint
3079 if (FLAG_IS_DEFAULT(UseLargePages) &&
3080 MaxHeapSize < LargePageHeapSizeThreshold) {
3081 // No need for large granularity pages w/small heaps.
3082 // Note that large pages are enabled/disabled for both the
3083 // Java heap and the code cache.
3084 FLAG_SET_DEFAULT(UseLargePages, false);
3085 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
3086 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
3087 }
3089 // Tiered compilation is undefined with C1.
3090 TieredCompilation = false;
3091 #else
3092 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3093 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3094 }
3095 #endif
3097 // If we are running in a headless jre, force java.awt.headless property
3098 // to be true unless the property has already been set.
3099 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3100 if (os::is_headless_jre()) {
3101 const char* headless = Arguments::get_property("java.awt.headless");
3102 if (headless == NULL) {
3103 char envbuffer[128];
3104 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3105 if (!add_property("java.awt.headless=true")) {
3106 return JNI_ENOMEM;
3107 }
3108 } else {
3109 char buffer[256];
3110 strcpy(buffer, "java.awt.headless=");
3111 strcat(buffer, envbuffer);
3112 if (!add_property(buffer)) {
3113 return JNI_ENOMEM;
3114 }
3115 }
3116 }
3117 }
3119 if (!check_vm_args_consistency()) {
3120 return JNI_ERR;
3121 }
3123 return JNI_OK;
3124 }
3126 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3127 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3128 scp_assembly_required_p);
3129 }
3131 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3132 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3133 scp_assembly_required_p);
3134 }
3136 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3137 const int N_MAX_OPTIONS = 64;
3138 const int OPTION_BUFFER_SIZE = 1024;
3139 char buffer[OPTION_BUFFER_SIZE];
3141 // The variable will be ignored if it exceeds the length of the buffer.
3142 // Don't check this variable if user has special privileges
3143 // (e.g. unix su command).
3144 if (os::getenv(name, buffer, sizeof(buffer)) &&
3145 !os::have_special_privileges()) {
3146 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3147 jio_fprintf(defaultStream::error_stream(),
3148 "Picked up %s: %s\n", name, buffer);
3149 char* rd = buffer; // pointer to the input string (rd)
3150 int i;
3151 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3152 while (isspace(*rd)) rd++; // skip whitespace
3153 if (*rd == 0) break; // we re done when the input string is read completely
3155 // The output, option string, overwrites the input string.
3156 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3157 // input string (rd).
3158 char* wrt = rd;
3160 options[i++].optionString = wrt; // Fill in option
3161 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3162 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3163 int quote = *rd; // matching quote to look for
3164 rd++; // don't copy open quote
3165 while (*rd != quote) { // include everything (even spaces) up until quote
3166 if (*rd == 0) { // string termination means unmatched string
3167 jio_fprintf(defaultStream::error_stream(),
3168 "Unmatched quote in %s\n", name);
3169 return JNI_ERR;
3170 }
3171 *wrt++ = *rd++; // copy to option string
3172 }
3173 rd++; // don't copy close quote
3174 } else {
3175 *wrt++ = *rd++; // copy to option string
3176 }
3177 }
3178 // Need to check if we're done before writing a NULL,
3179 // because the write could be to the byte that rd is pointing to.
3180 if (*rd++ == 0) {
3181 *wrt = 0;
3182 break;
3183 }
3184 *wrt = 0; // Zero terminate option
3185 }
3186 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3187 JavaVMInitArgs vm_args;
3188 vm_args.version = JNI_VERSION_1_2;
3189 vm_args.options = options;
3190 vm_args.nOptions = i;
3191 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3193 if (PrintVMOptions) {
3194 const char* tail;
3195 for (int i = 0; i < vm_args.nOptions; i++) {
3196 const JavaVMOption *option = vm_args.options + i;
3197 if (match_option(option, "-XX:", &tail)) {
3198 logOption(tail);
3199 }
3200 }
3201 }
3203 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3204 }
3205 return JNI_OK;
3206 }
3208 void Arguments::set_shared_spaces_flags() {
3209 #ifdef _LP64
3210 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3212 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3213 // static fields are incorrect in the archive. With some more clever
3214 // initialization, this restriction can probably be lifted.
3215 if (UseCompressedOops) {
3216 if (must_share) {
3217 warning("disabling compressed oops because of %s",
3218 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3219 FLAG_SET_CMDLINE(bool, UseCompressedOops, false);
3220 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false);
3221 } else {
3222 // Prefer compressed oops to class data sharing
3223 if (UseSharedSpaces && Verbose) {
3224 warning("turning off use of shared archive because of compressed oops");
3225 }
3226 no_shared_spaces();
3227 }
3228 }
3229 #endif
3231 if (DumpSharedSpaces) {
3232 if (RequireSharedSpaces) {
3233 warning("cannot dump shared archive while using shared archive");
3234 }
3235 UseSharedSpaces = false;
3236 }
3237 }
3239 // Disable options not supported in this release, with a warning if they
3240 // were explicitly requested on the command-line
3241 #define UNSUPPORTED_OPTION(opt, description) \
3242 do { \
3243 if (opt) { \
3244 if (FLAG_IS_CMDLINE(opt)) { \
3245 warning(description " is disabled in this release."); \
3246 } \
3247 FLAG_SET_DEFAULT(opt, false); \
3248 } \
3249 } while(0)
3252 #define UNSUPPORTED_GC_OPTION(gc) \
3253 do { \
3254 if (gc) { \
3255 if (FLAG_IS_CMDLINE(gc)) { \
3256 warning(#gc " is not supported in this VM. Using Serial GC."); \
3257 } \
3258 FLAG_SET_DEFAULT(gc, false); \
3259 } \
3260 } while(0)
3262 #if !INCLUDE_ALL_GCS
3263 static void force_serial_gc() {
3264 FLAG_SET_DEFAULT(UseSerialGC, true);
3265 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3266 UNSUPPORTED_GC_OPTION(UseG1GC);
3267 UNSUPPORTED_GC_OPTION(UseParallelGC);
3268 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3269 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3270 UNSUPPORTED_GC_OPTION(UseParNewGC);
3271 }
3272 #endif // INCLUDE_ALL_GCS
3274 // Sharing support
3275 // Construct the path to the archive
3276 static char* get_shared_archive_path() {
3277 char *shared_archive_path;
3278 if (SharedArchiveFile == NULL) {
3279 char jvm_path[JVM_MAXPATHLEN];
3280 os::jvm_path(jvm_path, sizeof(jvm_path));
3281 char *end = strrchr(jvm_path, *os::file_separator());
3282 if (end != NULL) *end = '\0';
3283 size_t jvm_path_len = strlen(jvm_path);
3284 size_t file_sep_len = strlen(os::file_separator());
3285 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3286 file_sep_len + 20, mtInternal);
3287 if (shared_archive_path != NULL) {
3288 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3289 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3290 strncat(shared_archive_path, "classes.jsa", 11);
3291 }
3292 } else {
3293 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3294 if (shared_archive_path != NULL) {
3295 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3296 }
3297 }
3298 return shared_archive_path;
3299 }
3301 // Parse entry point called from JNI_CreateJavaVM
3303 jint Arguments::parse(const JavaVMInitArgs* args) {
3305 // Remaining part of option string
3306 const char* tail;
3308 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3309 const char* hotspotrc = ".hotspotrc";
3310 bool settings_file_specified = false;
3311 bool needs_hotspotrc_warning = false;
3313 const char* flags_file;
3314 int index;
3315 for (index = 0; index < args->nOptions; index++) {
3316 const JavaVMOption *option = args->options + index;
3317 if (match_option(option, "-XX:Flags=", &tail)) {
3318 flags_file = tail;
3319 settings_file_specified = true;
3320 }
3321 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3322 PrintVMOptions = true;
3323 }
3324 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3325 PrintVMOptions = false;
3326 }
3327 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3328 IgnoreUnrecognizedVMOptions = true;
3329 }
3330 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3331 IgnoreUnrecognizedVMOptions = false;
3332 }
3333 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3334 CommandLineFlags::printFlags(tty, false);
3335 vm_exit(0);
3336 }
3337 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3338 #if INCLUDE_NMT
3339 MemTracker::init_tracking_options(tail);
3340 #else
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Native Memory Tracking is not supported in this VM\n");
3343 return JNI_ERR;
3344 #endif
3345 }
3348 #ifndef PRODUCT
3349 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3350 CommandLineFlags::printFlags(tty, true);
3351 vm_exit(0);
3352 }
3353 #endif
3354 }
3356 if (IgnoreUnrecognizedVMOptions) {
3357 // uncast const to modify the flag args->ignoreUnrecognized
3358 *(jboolean*)(&args->ignoreUnrecognized) = true;
3359 }
3361 // Parse specified settings file
3362 if (settings_file_specified) {
3363 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3364 return JNI_EINVAL;
3365 }
3366 } else {
3367 #ifdef ASSERT
3368 // Parse default .hotspotrc settings file
3369 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3370 return JNI_EINVAL;
3371 }
3372 #else
3373 struct stat buf;
3374 if (os::stat(hotspotrc, &buf) == 0) {
3375 needs_hotspotrc_warning = true;
3376 }
3377 #endif
3378 }
3380 if (PrintVMOptions) {
3381 for (index = 0; index < args->nOptions; index++) {
3382 const JavaVMOption *option = args->options + index;
3383 if (match_option(option, "-XX:", &tail)) {
3384 logOption(tail);
3385 }
3386 }
3387 }
3389 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3390 jint result = parse_vm_init_args(args);
3391 if (result != JNI_OK) {
3392 return result;
3393 }
3395 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3396 SharedArchivePath = get_shared_archive_path();
3397 if (SharedArchivePath == NULL) {
3398 return JNI_ENOMEM;
3399 }
3401 // Delay warning until here so that we've had a chance to process
3402 // the -XX:-PrintWarnings flag
3403 if (needs_hotspotrc_warning) {
3404 warning("%s file is present but has been ignored. "
3405 "Run with -XX:Flags=%s to load the file.",
3406 hotspotrc, hotspotrc);
3407 }
3409 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3410 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3411 #endif
3413 #if INCLUDE_ALL_GCS
3414 #if (defined JAVASE_EMBEDDED || defined ARM)
3415 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3416 #endif
3417 #endif
3419 #ifndef PRODUCT
3420 if (TraceBytecodesAt != 0) {
3421 TraceBytecodes = true;
3422 }
3423 if (CountCompiledCalls) {
3424 if (UseCounterDecay) {
3425 warning("UseCounterDecay disabled because CountCalls is set");
3426 UseCounterDecay = false;
3427 }
3428 }
3429 #endif // PRODUCT
3431 // JSR 292 is not supported before 1.7
3432 if (!JDK_Version::is_gte_jdk17x_version()) {
3433 if (EnableInvokeDynamic) {
3434 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3435 warning("JSR 292 is not supported before 1.7. Disabling support.");
3436 }
3437 EnableInvokeDynamic = false;
3438 }
3439 }
3441 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3442 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3443 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3444 }
3445 ScavengeRootsInCode = 1;
3446 }
3448 if (PrintGCDetails) {
3449 // Turn on -verbose:gc options as well
3450 PrintGC = true;
3451 }
3453 if (!JDK_Version::is_gte_jdk18x_version()) {
3454 // To avoid changing the log format for 7 updates this flag is only
3455 // true by default in JDK8 and above.
3456 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3457 FLAG_SET_DEFAULT(PrintGCCause, false);
3458 }
3459 }
3461 // Set object alignment values.
3462 set_object_alignment();
3464 #if !INCLUDE_ALL_GCS
3465 force_serial_gc();
3466 #endif // INCLUDE_ALL_GCS
3467 #if !INCLUDE_CDS
3468 if (DumpSharedSpaces || RequireSharedSpaces) {
3469 jio_fprintf(defaultStream::error_stream(),
3470 "Shared spaces are not supported in this VM\n");
3471 return JNI_ERR;
3472 }
3473 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3474 warning("Shared spaces are not supported in this VM");
3475 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3476 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3477 }
3478 no_shared_spaces();
3479 #endif // INCLUDE_CDS
3481 // Set flags based on ergonomics.
3482 set_ergonomics_flags();
3484 set_shared_spaces_flags();
3486 // Check the GC selections again.
3487 if (!check_gc_consistency()) {
3488 return JNI_EINVAL;
3489 }
3491 if (TieredCompilation) {
3492 set_tiered_flags();
3493 } else {
3494 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3495 if (CompilationPolicyChoice >= 2) {
3496 vm_exit_during_initialization(
3497 "Incompatible compilation policy selected", NULL);
3498 }
3499 }
3501 set_heap_base_min_address();
3503 // Set heap size based on available physical memory
3504 set_heap_size();
3506 #if INCLUDE_ALL_GCS
3507 // Set per-collector flags
3508 if (UseParallelGC || UseParallelOldGC) {
3509 set_parallel_gc_flags();
3510 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3511 set_cms_and_parnew_gc_flags();
3512 } else if (UseParNewGC) { // skipped if CMS is set above
3513 set_parnew_gc_flags();
3514 } else if (UseG1GC) {
3515 set_g1_gc_flags();
3516 }
3517 check_deprecated_gcs();
3518 check_deprecated_gc_flags();
3519 if (AssumeMP && !UseSerialGC) {
3520 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3521 warning("If the number of processors is expected to increase from one, then"
3522 " you should configure the number of parallel GC threads appropriately"
3523 " using -XX:ParallelGCThreads=N");
3524 }
3525 }
3526 #else // INCLUDE_ALL_GCS
3527 assert(verify_serial_gc_flags(), "SerialGC unset");
3528 #endif // INCLUDE_ALL_GCS
3530 // Set bytecode rewriting flags
3531 set_bytecode_flags();
3533 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3534 set_aggressive_opts_flags();
3536 // Turn off biased locking for locking debug mode flags,
3537 // which are subtlely different from each other but neither works with
3538 // biased locking.
3539 if (UseHeavyMonitors
3540 #ifdef COMPILER1
3541 || !UseFastLocking
3542 #endif // COMPILER1
3543 ) {
3544 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3545 // flag set to true on command line; warn the user that they
3546 // can't enable biased locking here
3547 warning("Biased Locking is not supported with locking debug flags"
3548 "; ignoring UseBiasedLocking flag." );
3549 }
3550 UseBiasedLocking = false;
3551 }
3553 #ifdef CC_INTERP
3554 // Clear flags not supported by the C++ interpreter
3555 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3556 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3557 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3558 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3559 #endif // CC_INTERP
3561 #ifdef COMPILER2
3562 if (!UseBiasedLocking || EmitSync != 0) {
3563 UseOptoBiasInlining = false;
3564 }
3565 if (!EliminateLocks) {
3566 EliminateNestedLocks = false;
3567 }
3568 if (!Inline) {
3569 IncrementalInline = false;
3570 }
3571 #ifndef PRODUCT
3572 if (!IncrementalInline) {
3573 AlwaysIncrementalInline = false;
3574 }
3575 #endif
3576 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3577 // incremental inlining: bump MaxNodeLimit
3578 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3579 }
3580 #endif
3582 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3583 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3584 DebugNonSafepoints = true;
3585 }
3587 #ifndef PRODUCT
3588 if (CompileTheWorld) {
3589 // Force NmethodSweeper to sweep whole CodeCache each time.
3590 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3591 NmethodSweepFraction = 1;
3592 }
3593 }
3594 #endif
3596 if (PrintCommandLineFlags) {
3597 CommandLineFlags::printSetFlags(tty);
3598 }
3600 // Apply CPU specific policy for the BiasedLocking
3601 if (UseBiasedLocking) {
3602 if (!VM_Version::use_biased_locking() &&
3603 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3604 UseBiasedLocking = false;
3605 }
3606 }
3608 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3609 // but only if not already set on the commandline
3610 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3611 bool set = false;
3612 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3613 if (!set) {
3614 FLAG_SET_DEFAULT(PauseAtExit, true);
3615 }
3616 }
3618 return JNI_OK;
3619 }
3621 jint Arguments::adjust_after_os() {
3622 #if INCLUDE_ALL_GCS
3623 if (UseParallelGC || UseParallelOldGC) {
3624 if (UseNUMA) {
3625 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3626 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3627 }
3628 // For those collectors or operating systems (eg, Windows) that do
3629 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3630 UseNUMAInterleaving = true;
3631 }
3632 }
3633 #endif // INCLUDE_ALL_GCS
3634 return JNI_OK;
3635 }
3637 int Arguments::PropertyList_count(SystemProperty* pl) {
3638 int count = 0;
3639 while(pl != NULL) {
3640 count++;
3641 pl = pl->next();
3642 }
3643 return count;
3644 }
3646 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3647 assert(key != NULL, "just checking");
3648 SystemProperty* prop;
3649 for (prop = pl; prop != NULL; prop = prop->next()) {
3650 if (strcmp(key, prop->key()) == 0) return prop->value();
3651 }
3652 return NULL;
3653 }
3655 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3656 int count = 0;
3657 const char* ret_val = NULL;
3659 while(pl != NULL) {
3660 if(count >= index) {
3661 ret_val = pl->key();
3662 break;
3663 }
3664 count++;
3665 pl = pl->next();
3666 }
3668 return ret_val;
3669 }
3671 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3672 int count = 0;
3673 char* ret_val = NULL;
3675 while(pl != NULL) {
3676 if(count >= index) {
3677 ret_val = pl->value();
3678 break;
3679 }
3680 count++;
3681 pl = pl->next();
3682 }
3684 return ret_val;
3685 }
3687 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3688 SystemProperty* p = *plist;
3689 if (p == NULL) {
3690 *plist = new_p;
3691 } else {
3692 while (p->next() != NULL) {
3693 p = p->next();
3694 }
3695 p->set_next(new_p);
3696 }
3697 }
3699 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3700 if (plist == NULL)
3701 return;
3703 SystemProperty* new_p = new SystemProperty(k, v, true);
3704 PropertyList_add(plist, new_p);
3705 }
3707 // This add maintains unique property key in the list.
3708 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3709 if (plist == NULL)
3710 return;
3712 // If property key exist then update with new value.
3713 SystemProperty* prop;
3714 for (prop = *plist; prop != NULL; prop = prop->next()) {
3715 if (strcmp(k, prop->key()) == 0) {
3716 if (append) {
3717 prop->append_value(v);
3718 } else {
3719 prop->set_value(v);
3720 }
3721 return;
3722 }
3723 }
3725 PropertyList_add(plist, k, v);
3726 }
3728 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3729 // Returns true if all of the source pointed by src has been copied over to
3730 // the destination buffer pointed by buf. Otherwise, returns false.
3731 // Notes:
3732 // 1. If the length (buflen) of the destination buffer excluding the
3733 // NULL terminator character is not long enough for holding the expanded
3734 // pid characters, it also returns false instead of returning the partially
3735 // expanded one.
3736 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3737 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3738 char* buf, size_t buflen) {
3739 const char* p = src;
3740 char* b = buf;
3741 const char* src_end = &src[srclen];
3742 char* buf_end = &buf[buflen - 1];
3744 while (p < src_end && b < buf_end) {
3745 if (*p == '%') {
3746 switch (*(++p)) {
3747 case '%': // "%%" ==> "%"
3748 *b++ = *p++;
3749 break;
3750 case 'p': { // "%p" ==> current process id
3751 // buf_end points to the character before the last character so
3752 // that we could write '\0' to the end of the buffer.
3753 size_t buf_sz = buf_end - b + 1;
3754 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3756 // if jio_snprintf fails or the buffer is not long enough to hold
3757 // the expanded pid, returns false.
3758 if (ret < 0 || ret >= (int)buf_sz) {
3759 return false;
3760 } else {
3761 b += ret;
3762 assert(*b == '\0', "fail in copy_expand_pid");
3763 if (p == src_end && b == buf_end + 1) {
3764 // reach the end of the buffer.
3765 return true;
3766 }
3767 }
3768 p++;
3769 break;
3770 }
3771 default :
3772 *b++ = '%';
3773 }
3774 } else {
3775 *b++ = *p++;
3776 }
3777 }
3778 *b = '\0';
3779 return (p == src_end); // return false if not all of the source was copied
3780 }