1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 #define UNSUPPORTED_GC_OPTION(gc) \
61 do { \
62 if (gc) { \
63 if (FLAG_IS_CMDLINE(gc)) { \
64 warning(#gc " is not supported in this VM. Using Serial GC."); \
65 } \
66 FLAG_SET_DEFAULT(gc, false); \
67 } \
68 } while(0)
69
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 uintx Arguments::_min_heap_size = 0;
80 uintx Arguments::_min_heap_free_ratio = 0;
81 uintx Arguments::_max_heap_free_ratio = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95
96 char* Arguments::SharedArchivePath = NULL;
97
98 AgentLibraryList Arguments::_libraryList;
99 AgentLibraryList Arguments::_agentList;
100
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_sun_boot_class_path = NULL;
111
112 char* Arguments::_ext_dirs = NULL;
113
114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
115 // part of the option string.
116 static bool match_option(const JavaVMOption *option, const char* name,
117 const char** tail) {
118 int len = (int)strlen(name);
119 if (strncmp(option->optionString, name, len) == 0) {
120 *tail = option->optionString + len;
121 return true;
122 } else {
123 return false;
124 }
125 }
126
127 // Check if 'option' matches 'name'. No "tail" is allowed.
128 static bool match_option(const JavaVMOption *option, const char* name) {
129 const char* tail = NULL;
130 bool result = match_option(option, name, &tail);
131 if (tail != NULL && *tail == '\0') {
132 return result;
133 } else {
134 return false;
135 }
136 }
137
138 // Return true if any of the strings in null-terminated array 'names' matches.
139 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
140 // the option must match exactly.
141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
142 bool tail_allowed) {
143 for (/* empty */; *names != NULL; ++names) {
144 if (match_option(option, *names, tail)) {
145 if (**tail == '\0' || tail_allowed && **tail == ':') {
146 return true;
147 }
148 }
149 }
150 return false;
151 }
152
153 static void logOption(const char* opt) {
154 if (PrintVMOptions) {
155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
156 }
157 }
158
159 // Process java launcher properties.
160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
162 // sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
168
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
174 if (strcmp(tail, "true") == 0) {
175 _sun_java_launcher_is_altjvm = true;
176 }
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
180 _sun_java_launcher_pid = atoi(tail);
181 continue;
182 }
183 }
184 }
185
186 // Initialize system properties key and value.
187 void Arguments::init_system_properties() {
188
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
190 "Java Virtual Machine Specification", false));
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
194
195 // Following are JVMTI agent writable properties.
196 // Properties values are set to NULL and they are
197 // os specific they are initialized in os::init_system_properties_values().
198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
199 _java_library_path = new SystemProperty("java.library.path", NULL, true);
200 _java_home = new SystemProperty("java.home", NULL, true);
201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
202
203 _java_class_path = new SystemProperty("java.class.path", "", true);
204
205 // Add to System Property list.
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 spec_vendor = "Oracle Corporation";
225 spec_version = JDK_Version::current().major_version();
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
227
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
235
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 */
244 typedef struct {
245 const char* name;
246 JDK_Version obsoleted_in; // when the flag went away
247 JDK_Version accept_until; // which version to start denying the existence
248 } ObsoleteFlag;
249
250 static ObsoleteFlag obsolete_jvm_flags[] = {
251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
266 { "DefaultInitialRAMFraction",
267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "UseDepthFirstScavengeOrder",
269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
270 { "HandlePromotionFailure",
271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
272 { "MaxLiveObjectEvacuationRatio",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
275 { "UseParallelOldGCCompacting",
276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
277 { "UseParallelDensePrefixUpdate",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelOldGCDensePrefix",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 #ifdef PRODUCT
304 { "DesiredMethodLimit",
305 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
306 #endif // PRODUCT
307 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
310 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
315 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
316 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
317 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
318 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
319 #ifndef ZERO
320 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
321 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
322 #endif // ZERO
323 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
324 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
325 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
326 { NULL, JDK_Version(0), JDK_Version(0) }
327 };
328
329 // Returns true if the flag is obsolete and fits into the range specified
330 // for being ignored. In the case that the flag is ignored, the 'version'
331 // value is filled in with the version number when the flag became
332 // obsolete so that that value can be displayed to the user.
333 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
334 int i = 0;
335 assert(version != NULL, "Must provide a version buffer");
336 while (obsolete_jvm_flags[i].name != NULL) {
337 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
338 // <flag>=xxx form
339 // [-|+]<flag> form
340 size_t len = strlen(flag_status.name);
341 if (((strncmp(flag_status.name, s, len) == 0) &&
342 (strlen(s) == len)) ||
343 ((s[0] == '+' || s[0] == '-') &&
344 (strncmp(flag_status.name, &s[1], len) == 0) &&
345 (strlen(&s[1]) == len))) {
346 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
347 *version = flag_status.obsoleted_in;
348 return true;
349 }
350 }
351 i++;
352 }
353 return false;
354 }
355
356 // Constructs the system class path (aka boot class path) from the following
357 // components, in order:
358 //
359 // prefix // from -Xbootclasspath/p:...
360 // base // from os::get_system_properties() or -Xbootclasspath=
361 // suffix // from -Xbootclasspath/a:...
362 //
363 // This could be AllStatic, but it isn't needed after argument processing is
364 // complete.
365 class SysClassPath: public StackObj {
366 public:
367 SysClassPath(const char* base);
368 ~SysClassPath();
369
370 inline void set_base(const char* base);
371 inline void add_prefix(const char* prefix);
372 inline void add_suffix_to_prefix(const char* suffix);
373 inline void add_suffix(const char* suffix);
374 inline void reset_path(const char* base);
375
376 inline const char* get_base() const { return _items[_scp_base]; }
377 inline const char* get_prefix() const { return _items[_scp_prefix]; }
378 inline const char* get_suffix() const { return _items[_scp_suffix]; }
379
380 // Combine all the components into a single c-heap-allocated string; caller
381 // must free the string if/when no longer needed.
382 char* combined_path();
383
384 private:
385 // Utility routines.
386 static char* add_to_path(const char* path, const char* str, bool prepend);
387 static char* add_jars_to_path(char* path, const char* directory);
388
389 inline void reset_item_at(int index);
390
391 // Array indices for the items that make up the sysclasspath. All except the
392 // base are allocated in the C heap and freed by this class.
393 enum {
394 _scp_prefix, // from -Xbootclasspath/p:...
395 _scp_base, // the default sysclasspath
396 _scp_suffix, // from -Xbootclasspath/a:...
397 _scp_nitems // the number of items, must be last.
398 };
399
400 const char* _items[_scp_nitems];
401 };
402
403 SysClassPath::SysClassPath(const char* base) {
404 memset(_items, 0, sizeof(_items));
405 _items[_scp_base] = base;
406 }
407
408 SysClassPath::~SysClassPath() {
409 // Free everything except the base.
410 for (int i = 0; i < _scp_nitems; ++i) {
411 if (i != _scp_base) reset_item_at(i);
412 }
413 }
414
415 inline void SysClassPath::set_base(const char* base) {
416 _items[_scp_base] = base;
417 }
418
419 inline void SysClassPath::add_prefix(const char* prefix) {
420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
421 }
422
423 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
424 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
425 }
426
427 inline void SysClassPath::add_suffix(const char* suffix) {
428 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
429 }
430
431 inline void SysClassPath::reset_item_at(int index) {
432 assert(index < _scp_nitems && index != _scp_base, "just checking");
433 if (_items[index] != NULL) {
434 FREE_C_HEAP_ARRAY(char, _items[index]);
435 _items[index] = NULL;
436 }
437 }
438
439 inline void SysClassPath::reset_path(const char* base) {
440 // Clear the prefix and suffix.
441 reset_item_at(_scp_prefix);
442 reset_item_at(_scp_suffix);
443 set_base(base);
444 }
445
446 //------------------------------------------------------------------------------
447
448
449 // Combine the bootclasspath elements, some of which may be null, into a single
450 // c-heap-allocated string.
451 char* SysClassPath::combined_path() {
452 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
453
454 size_t lengths[_scp_nitems];
455 size_t total_len = 0;
456
457 const char separator = *os::path_separator();
458
459 // Get the lengths.
460 int i;
461 for (i = 0; i < _scp_nitems; ++i) {
462 if (_items[i] != NULL) {
463 lengths[i] = strlen(_items[i]);
464 // Include space for the separator char (or a NULL for the last item).
465 total_len += lengths[i] + 1;
466 }
467 }
468 assert(total_len > 0, "empty sysclasspath not allowed");
469
470 // Copy the _items to a single string.
471 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
472 char* cp_tmp = cp;
473 for (i = 0; i < _scp_nitems; ++i) {
474 if (_items[i] != NULL) {
475 memcpy(cp_tmp, _items[i], lengths[i]);
476 cp_tmp += lengths[i];
477 *cp_tmp++ = separator;
478 }
479 }
480 *--cp_tmp = '\0'; // Replace the extra separator.
481 return cp;
482 }
483
484 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
485 char*
486 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
487 char *cp;
488
489 assert(str != NULL, "just checking");
490 if (path == NULL) {
491 size_t len = strlen(str) + 1;
492 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
493 memcpy(cp, str, len); // copy the trailing null
494 } else {
495 const char separator = *os::path_separator();
496 size_t old_len = strlen(path);
497 size_t str_len = strlen(str);
498 size_t len = old_len + str_len + 2;
499
500 if (prepend) {
501 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
502 char* cp_tmp = cp;
503 memcpy(cp_tmp, str, str_len);
504 cp_tmp += str_len;
505 *cp_tmp = separator;
506 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
507 FREE_C_HEAP_ARRAY(char, path);
508 } else {
509 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
510 char* cp_tmp = cp + old_len;
511 *cp_tmp = separator;
512 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
513 }
514 }
515 return cp;
516 }
517
518 // Scan the directory and append any jar or zip files found to path.
519 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
520 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
521 DIR* dir = os::opendir(directory);
522 if (dir == NULL) return path;
523
524 char dir_sep[2] = { '\0', '\0' };
525 size_t directory_len = strlen(directory);
526 const char fileSep = *os::file_separator();
527 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
528
529 /* Scan the directory for jars/zips, appending them to path. */
530 struct dirent *entry;
531 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
532 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
533 const char* name = entry->d_name;
534 const char* ext = name + strlen(name) - 4;
535 bool isJarOrZip = ext > name &&
536 (os::file_name_strcmp(ext, ".jar") == 0 ||
537 os::file_name_strcmp(ext, ".zip") == 0);
538 if (isJarOrZip) {
539 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
540 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
541 path = add_to_path(path, jarpath, false);
542 FREE_C_HEAP_ARRAY(char, jarpath);
543 }
544 }
545 FREE_C_HEAP_ARRAY(char, dbuf);
546 os::closedir(dir);
547 return path;
548 }
549
550 // Parses a memory size specification string.
551 static bool atomull(const char *s, julong* result) {
552 julong n = 0;
553 int args_read = 0;
554 bool is_hex = false;
555 // Skip leading 0[xX] for hexadecimal
556 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
557 s += 2;
558 is_hex = true;
559 args_read = sscanf(s, JULONG_FORMAT_X, &n);
560 } else {
561 args_read = sscanf(s, JULONG_FORMAT, &n);
562 }
563 if (args_read != 1) {
564 return false;
565 }
566 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
567 s++;
568 }
569 // 4705540: illegal if more characters are found after the first non-digit
570 if (strlen(s) > 1) {
571 return false;
572 }
573 switch (*s) {
574 case 'T': case 't':
575 *result = n * G * K;
576 // Check for overflow.
577 if (*result/((julong)G * K) != n) return false;
578 return true;
579 case 'G': case 'g':
580 *result = n * G;
581 if (*result/G != n) return false;
582 return true;
583 case 'M': case 'm':
584 *result = n * M;
585 if (*result/M != n) return false;
586 return true;
587 case 'K': case 'k':
588 *result = n * K;
589 if (*result/K != n) return false;
590 return true;
591 case '\0':
592 *result = n;
593 return true;
594 default:
595 return false;
596 }
597 }
598
599 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
600 if (size < min_size) return arg_too_small;
601 // Check that size will fit in a size_t (only relevant on 32-bit)
602 if (size > max_uintx) return arg_too_big;
603 return arg_in_range;
604 }
605
606 // Describe an argument out of range error
607 void Arguments::describe_range_error(ArgsRange errcode) {
608 switch(errcode) {
609 case arg_too_big:
610 jio_fprintf(defaultStream::error_stream(),
611 "The specified size exceeds the maximum "
612 "representable size.\n");
613 break;
614 case arg_too_small:
615 case arg_unreadable:
616 case arg_in_range:
617 // do nothing for now
618 break;
619 default:
620 ShouldNotReachHere();
621 }
622 }
623
624 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
625 return CommandLineFlags::boolAtPut(name, &value, origin);
626 }
627
628 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
629 double v;
630 if (sscanf(value, "%lf", &v) != 1) {
631 return false;
632 }
633
634 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
635 return true;
636 }
637 return false;
638 }
639
640 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
641 julong v;
642 intx intx_v;
643 bool is_neg = false;
644 // Check the sign first since atomull() parses only unsigned values.
645 if (*value == '-') {
646 if (!CommandLineFlags::intxAt(name, &intx_v)) {
647 return false;
648 }
649 value++;
650 is_neg = true;
651 }
652 if (!atomull(value, &v)) {
653 return false;
654 }
655 intx_v = (intx) v;
656 if (is_neg) {
657 intx_v = -intx_v;
658 }
659 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
660 return true;
661 }
662 uintx uintx_v = (uintx) v;
663 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
664 return true;
665 }
666 uint64_t uint64_t_v = (uint64_t) v;
667 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
668 return true;
669 }
670 size_t size_t_v = (size_t) v;
671 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
672 return true;
673 }
674 return false;
675 }
676
677 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
678 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
679 // Contract: CommandLineFlags always returns a pointer that needs freeing.
680 FREE_C_HEAP_ARRAY(char, value);
681 return true;
682 }
683
684 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
685 const char* old_value = "";
686 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
687 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
688 size_t new_len = strlen(new_value);
689 const char* value;
690 char* free_this_too = NULL;
691 if (old_len == 0) {
692 value = new_value;
693 } else if (new_len == 0) {
694 value = old_value;
695 } else {
696 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
697 // each new setting adds another LINE to the switch:
698 sprintf(buf, "%s\n%s", old_value, new_value);
699 value = buf;
700 free_this_too = buf;
701 }
702 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
703 // CommandLineFlags always returns a pointer that needs freeing.
704 FREE_C_HEAP_ARRAY(char, value);
705 if (free_this_too != NULL) {
706 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
707 FREE_C_HEAP_ARRAY(char, free_this_too);
708 }
709 return true;
710 }
711
712 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
713
714 // range of acceptable characters spelled out for portability reasons
715 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
716 #define BUFLEN 255
717 char name[BUFLEN+1];
718 char dummy;
719
720 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
721 return set_bool_flag(name, false, origin);
722 }
723 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
724 return set_bool_flag(name, true, origin);
725 }
726
727 char punct;
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
729 const char* value = strchr(arg, '=') + 1;
730 Flag* flag = Flag::find_flag(name, strlen(name));
731 if (flag != NULL && flag->is_ccstr()) {
732 if (flag->ccstr_accumulates()) {
733 return append_to_string_flag(name, value, origin);
734 } else {
735 if (value[0] == '\0') {
736 value = NULL;
737 }
738 return set_string_flag(name, value, origin);
739 }
740 }
741 }
742
743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
744 const char* value = strchr(arg, '=') + 1;
745 // -XX:Foo:=xxx will reset the string flag to the given value.
746 if (value[0] == '\0') {
747 value = NULL;
748 }
749 return set_string_flag(name, value, origin);
750 }
751
752 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
753 #define SIGNED_NUMBER_RANGE "[-0123456789]"
754 #define NUMBER_RANGE "[0123456789]"
755 char value[BUFLEN + 1];
756 char value2[BUFLEN + 1];
757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
758 // Looks like a floating-point number -- try again with more lenient format string
759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
760 return set_fp_numeric_flag(name, value, origin);
761 }
762 }
763
764 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
765 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
766 return set_numeric_flag(name, value, origin);
767 }
768
769 return false;
770 }
771
772 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
773 assert(bldarray != NULL, "illegal argument");
774
775 if (arg == NULL) {
776 return;
777 }
778
779 int new_count = *count + 1;
780
781 // expand the array and add arg to the last element
782 if (*bldarray == NULL) {
783 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
784 } else {
785 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
786 }
787 (*bldarray)[*count] = os::strdup_check_oom(arg);
788 *count = new_count;
789 }
790
791 void Arguments::build_jvm_args(const char* arg) {
792 add_string(&_jvm_args_array, &_num_jvm_args, arg);
793 }
794
795 void Arguments::build_jvm_flags(const char* arg) {
796 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
797 }
798
799 // utility function to return a string that concatenates all
800 // strings in a given char** array
801 const char* Arguments::build_resource_string(char** args, int count) {
802 if (args == NULL || count == 0) {
803 return NULL;
804 }
805 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
806 for (int i = 1; i < count; i++) {
807 length += strlen(args[i]) + 1; // add 1 for a space
808 }
809 char* s = NEW_RESOURCE_ARRAY(char, length);
810 strcpy(s, args[0]);
811 for (int j = 1; j < count; j++) {
812 strcat(s, " ");
813 strcat(s, args[j]);
814 }
815 return (const char*) s;
816 }
817
818 void Arguments::print_on(outputStream* st) {
819 st->print_cr("VM Arguments:");
820 if (num_jvm_flags() > 0) {
821 st->print("jvm_flags: "); print_jvm_flags_on(st);
822 }
823 if (num_jvm_args() > 0) {
824 st->print("jvm_args: "); print_jvm_args_on(st);
825 }
826 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
827 if (_java_class_path != NULL) {
828 char* path = _java_class_path->value();
829 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
830 }
831 st->print_cr("Launcher Type: %s", _sun_java_launcher);
832 }
833
834 void Arguments::print_jvm_flags_on(outputStream* st) {
835 if (_num_jvm_flags > 0) {
836 for (int i=0; i < _num_jvm_flags; i++) {
837 st->print("%s ", _jvm_flags_array[i]);
838 }
839 st->cr();
840 }
841 }
842
843 void Arguments::print_jvm_args_on(outputStream* st) {
844 if (_num_jvm_args > 0) {
845 for (int i=0; i < _num_jvm_args; i++) {
846 st->print("%s ", _jvm_args_array[i]);
847 }
848 st->cr();
849 }
850 }
851
852 bool Arguments::process_argument(const char* arg,
853 jboolean ignore_unrecognized, Flag::Flags origin) {
854
855 JDK_Version since = JDK_Version();
856
857 if (parse_argument(arg, origin) || ignore_unrecognized) {
858 return true;
859 }
860
861 bool has_plus_minus = (*arg == '+' || *arg == '-');
862 const char* const argname = has_plus_minus ? arg + 1 : arg;
863 if (is_newly_obsolete(arg, &since)) {
864 char version[256];
865 since.to_string(version, sizeof(version));
866 warning("ignoring option %s; support was removed in %s", argname, version);
867 return true;
868 }
869
870 // For locked flags, report a custom error message if available.
871 // Otherwise, report the standard unrecognized VM option.
872
873 size_t arg_len;
874 const char* equal_sign = strchr(argname, '=');
875 if (equal_sign == NULL) {
876 arg_len = strlen(argname);
877 } else {
878 arg_len = equal_sign - argname;
879 }
880
881 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
882 if (found_flag != NULL) {
883 char locked_message_buf[BUFLEN];
884 found_flag->get_locked_message(locked_message_buf, BUFLEN);
885 if (strlen(locked_message_buf) == 0) {
886 if (found_flag->is_bool() && !has_plus_minus) {
887 jio_fprintf(defaultStream::error_stream(),
888 "Missing +/- setting for VM option '%s'\n", argname);
889 } else if (!found_flag->is_bool() && has_plus_minus) {
890 jio_fprintf(defaultStream::error_stream(),
891 "Unexpected +/- setting in VM option '%s'\n", argname);
892 } else {
893 jio_fprintf(defaultStream::error_stream(),
894 "Improperly specified VM option '%s'\n", argname);
895 }
896 } else {
897 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
898 }
899 } else {
900 jio_fprintf(defaultStream::error_stream(),
901 "Unrecognized VM option '%s'\n", argname);
902 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
903 if (fuzzy_matched != NULL) {
904 jio_fprintf(defaultStream::error_stream(),
905 "Did you mean '%s%s%s'? ",
906 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
907 fuzzy_matched->_name,
908 (fuzzy_matched->is_bool()) ? "" : "=<value>");
909 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
910 char version[256];
911 since.to_string(version, sizeof(version));
912 jio_fprintf(defaultStream::error_stream(),
913 "Warning: support for %s was removed in %s\n",
914 fuzzy_matched->_name,
915 version);
916 }
917 }
918 }
919
920 // allow for commandline "commenting out" options like -XX:#+Verbose
921 return arg[0] == '#';
922 }
923
924 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
925 FILE* stream = fopen(file_name, "rb");
926 if (stream == NULL) {
927 if (should_exist) {
928 jio_fprintf(defaultStream::error_stream(),
929 "Could not open settings file %s\n", file_name);
930 return false;
931 } else {
932 return true;
933 }
934 }
935
936 char token[1024];
937 int pos = 0;
938
939 bool in_white_space = true;
940 bool in_comment = false;
941 bool in_quote = false;
942 char quote_c = 0;
943 bool result = true;
944
945 int c = getc(stream);
946 while(c != EOF && pos < (int)(sizeof(token)-1)) {
947 if (in_white_space) {
948 if (in_comment) {
949 if (c == '\n') in_comment = false;
950 } else {
951 if (c == '#') in_comment = true;
952 else if (!isspace(c)) {
953 in_white_space = false;
954 token[pos++] = c;
955 }
956 }
957 } else {
958 if (c == '\n' || (!in_quote && isspace(c))) {
959 // token ends at newline, or at unquoted whitespace
960 // this allows a way to include spaces in string-valued options
961 token[pos] = '\0';
962 logOption(token);
963 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
964 build_jvm_flags(token);
965 pos = 0;
966 in_white_space = true;
967 in_quote = false;
968 } else if (!in_quote && (c == '\'' || c == '"')) {
969 in_quote = true;
970 quote_c = c;
971 } else if (in_quote && (c == quote_c)) {
972 in_quote = false;
973 } else {
974 token[pos++] = c;
975 }
976 }
977 c = getc(stream);
978 }
979 if (pos > 0) {
980 token[pos] = '\0';
981 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
982 build_jvm_flags(token);
983 }
984 fclose(stream);
985 return result;
986 }
987
988 //=============================================================================================================
989 // Parsing of properties (-D)
990
991 const char* Arguments::get_property(const char* key) {
992 return PropertyList_get_value(system_properties(), key);
993 }
994
995 bool Arguments::add_property(const char* prop) {
996 const char* eq = strchr(prop, '=');
997 char* key;
998 // ns must be static--its address may be stored in a SystemProperty object.
999 const static char ns[1] = {0};
1000 char* value = (char *)ns;
1001
1002 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1003 key = AllocateHeap(key_len + 1, mtInternal);
1004 strncpy(key, prop, key_len);
1005 key[key_len] = '\0';
1006
1007 if (eq != NULL) {
1008 size_t value_len = strlen(prop) - key_len - 1;
1009 value = AllocateHeap(value_len + 1, mtInternal);
1010 strncpy(value, &prop[key_len + 1], value_len + 1);
1011 }
1012
1013 if (strcmp(key, "java.compiler") == 0) {
1014 process_java_compiler_argument(value);
1015 FreeHeap(key);
1016 if (eq != NULL) {
1017 FreeHeap(value);
1018 }
1019 return true;
1020 } else if (strcmp(key, "sun.java.command") == 0) {
1021 _java_command = value;
1022
1023 // Record value in Arguments, but let it get passed to Java.
1024 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1025 strcmp(key, "sun.java.launcher.pid") == 0) {
1026 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1027 // private and are processed in process_sun_java_launcher_properties();
1028 // the sun.java.launcher property is passed on to the java application
1029 FreeHeap(key);
1030 if (eq != NULL) {
1031 FreeHeap(value);
1032 }
1033 return true;
1034 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1035 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1036 // its value without going through the property list or making a Java call.
1037 _java_vendor_url_bug = value;
1038 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1039 PropertyList_unique_add(&_system_properties, key, value, true);
1040 return true;
1041 }
1042 // Create new property and add at the end of the list
1043 PropertyList_unique_add(&_system_properties, key, value);
1044 return true;
1045 }
1046
1047 //===========================================================================================================
1048 // Setting int/mixed/comp mode flags
1049
1050 void Arguments::set_mode_flags(Mode mode) {
1051 // Set up default values for all flags.
1052 // If you add a flag to any of the branches below,
1053 // add a default value for it here.
1054 set_java_compiler(false);
1055 _mode = mode;
1056
1057 // Ensure Agent_OnLoad has the correct initial values.
1058 // This may not be the final mode; mode may change later in onload phase.
1059 PropertyList_unique_add(&_system_properties, "java.vm.info",
1060 (char*)VM_Version::vm_info_string(), false);
1061
1062 UseInterpreter = true;
1063 UseCompiler = true;
1064 UseLoopCounter = true;
1065
1066 // Default values may be platform/compiler dependent -
1067 // use the saved values
1068 ClipInlining = Arguments::_ClipInlining;
1069 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1070 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1071 BackgroundCompilation = Arguments::_BackgroundCompilation;
1072
1073 // Change from defaults based on mode
1074 switch (mode) {
1075 default:
1076 ShouldNotReachHere();
1077 break;
1078 case _int:
1079 UseCompiler = false;
1080 UseLoopCounter = false;
1081 AlwaysCompileLoopMethods = false;
1082 UseOnStackReplacement = false;
1083 break;
1084 case _mixed:
1085 // same as default
1086 break;
1087 case _comp:
1088 UseInterpreter = false;
1089 BackgroundCompilation = false;
1090 ClipInlining = false;
1091 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1092 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1093 // compile a level 4 (C2) and then continue executing it.
1094 if (TieredCompilation) {
1095 Tier3InvokeNotifyFreqLog = 0;
1096 Tier4InvocationThreshold = 0;
1097 }
1098 break;
1099 }
1100 }
1101
1102 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1103 // Conflict: required to use shared spaces (-Xshare:on), but
1104 // incompatible command line options were chosen.
1105
1106 static void no_shared_spaces(const char* message) {
1107 if (RequireSharedSpaces) {
1108 jio_fprintf(defaultStream::error_stream(),
1109 "Class data sharing is inconsistent with other specified options.\n");
1110 vm_exit_during_initialization("Unable to use shared archive.", message);
1111 } else {
1112 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1113 }
1114 }
1115 #endif
1116
1117 // Returns threshold scaled with the value of scale.
1118 // If scale < 0.0, threshold is returned without scaling.
1119 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1120 if (scale == 1.0 || scale < 0.0) {
1121 return threshold;
1122 } else {
1123 return (intx)(threshold * scale);
1124 }
1125 }
1126
1127 // Returns freq_log scaled with the value of scale.
1128 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1129 // If scale < 0.0, freq_log is returned without scaling.
1130 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1131 // Check if scaling is necessary or if negative value was specified.
1132 if (scale == 1.0 || scale < 0.0) {
1133 return freq_log;
1134 }
1135 // Check values to avoid calculating log2 of 0.
1136 if (scale == 0.0 || freq_log == 0) {
1137 return 0;
1138 }
1139 // Determine the maximum notification frequency value currently supported.
1140 // The largest mask value that the interpreter/C1 can handle is
1141 // of length InvocationCounter::number_of_count_bits. Mask values are always
1142 // one bit shorter then the value of the notification frequency. Set
1143 // max_freq_bits accordingly.
1144 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1145 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1146 if (scaled_freq == 0) {
1147 // Return 0 right away to avoid calculating log2 of 0.
1148 return 0;
1149 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1150 return max_freq_bits;
1151 } else {
1152 return log2_intptr(scaled_freq);
1153 }
1154 }
1155
1156 void Arguments::set_tiered_flags() {
1157 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1158 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1159 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1160 }
1161 if (CompilationPolicyChoice < 2) {
1162 vm_exit_during_initialization(
1163 "Incompatible compilation policy selected", NULL);
1164 }
1165 // Increase the code cache size - tiered compiles a lot more.
1166 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1167 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1168 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1169 }
1170 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1171 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1172 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1173
1174 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1175 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1176 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1177 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1178 }
1179 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1180 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1181 }
1182 // Check consistency of code heap sizes
1183 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1184 jio_fprintf(defaultStream::error_stream(),
1185 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1186 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1187 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1188 vm_exit(1);
1189 }
1190 }
1191 }
1192 if (!UseInterpreter) { // -Xcomp
1193 Tier3InvokeNotifyFreqLog = 0;
1194 Tier4InvocationThreshold = 0;
1195 }
1196
1197 if (CompileThresholdScaling < 0) {
1198 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1199 }
1200
1201 // Scale tiered compilation thresholds.
1202 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1203 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1204 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1205 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1206
1207 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1208 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1209 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1210 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1211
1212 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1213 // once these thresholds become supported.
1214
1215 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1216 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1217
1218 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1219 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1220
1221 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1222
1223 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1224 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1225 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1226 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1227 }
1228 }
1229
1230 /**
1231 * Returns the minimum number of compiler threads needed to run the JVM. The following
1232 * configurations are possible.
1233 *
1234 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1235 * compiler threads is 0.
1236 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1237 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1238 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1239 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1240 * C1 can be used, so the minimum number of compiler threads is 1.
1241 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1242 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1243 * the minimum number of compiler threads is 2.
1244 */
1245 int Arguments::get_min_number_of_compiler_threads() {
1246 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1247 return 0; // case 1
1248 #else
1249 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1250 return 1; // case 2 or case 3
1251 }
1252 return 2; // case 4 (tiered)
1253 #endif
1254 }
1255
1256 #if INCLUDE_ALL_GCS
1257 static void disable_adaptive_size_policy(const char* collector_name) {
1258 if (UseAdaptiveSizePolicy) {
1259 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1260 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1261 collector_name);
1262 }
1263 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1264 }
1265 }
1266
1267 void Arguments::set_parnew_gc_flags() {
1268 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1269 "control point invariant");
1270 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1271 assert(UseParNewGC, "ParNew should always be used with CMS");
1272
1273 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1274 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1275 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1276 } else if (ParallelGCThreads == 0) {
1277 jio_fprintf(defaultStream::error_stream(),
1278 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1279 vm_exit(1);
1280 }
1281
1282 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1283 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1284 // we set them to 1024 and 1024.
1285 // See CR 6362902.
1286 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1287 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1288 }
1289 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1290 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1291 }
1292
1293 // When using compressed oops, we use local overflow stacks,
1294 // rather than using a global overflow list chained through
1295 // the klass word of the object's pre-image.
1296 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1297 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1298 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1299 }
1300 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1301 }
1302 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1303 }
1304
1305 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1306 // sparc/solaris for certain applications, but would gain from
1307 // further optimization and tuning efforts, and would almost
1308 // certainly gain from analysis of platform and environment.
1309 void Arguments::set_cms_and_parnew_gc_flags() {
1310 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1311 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1312 assert(UseParNewGC, "ParNew should always be used with CMS");
1313
1314 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1315 disable_adaptive_size_policy("UseConcMarkSweepGC");
1316
1317 set_parnew_gc_flags();
1318
1319 size_t max_heap = align_size_down(MaxHeapSize,
1320 CardTableRS::ct_max_alignment_constraint());
1321
1322 // Now make adjustments for CMS
1323 intx tenuring_default = (intx)6;
1324 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1325
1326 // Preferred young gen size for "short" pauses:
1327 // upper bound depends on # of threads and NewRatio.
1328 const uintx parallel_gc_threads =
1329 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1330 const size_t preferred_max_new_size_unaligned =
1331 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1332 size_t preferred_max_new_size =
1333 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1334
1335 // Unless explicitly requested otherwise, size young gen
1336 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1337
1338 // If either MaxNewSize or NewRatio is set on the command line,
1339 // assume the user is trying to set the size of the young gen.
1340 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1341
1342 // Set MaxNewSize to our calculated preferred_max_new_size unless
1343 // NewSize was set on the command line and it is larger than
1344 // preferred_max_new_size.
1345 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1346 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1347 } else {
1348 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1349 }
1350 if (PrintGCDetails && Verbose) {
1351 // Too early to use gclog_or_tty
1352 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1353 }
1354
1355 // Code along this path potentially sets NewSize and OldSize
1356 if (PrintGCDetails && Verbose) {
1357 // Too early to use gclog_or_tty
1358 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1359 " initial_heap_size: " SIZE_FORMAT
1360 " max_heap: " SIZE_FORMAT,
1361 min_heap_size(), InitialHeapSize, max_heap);
1362 }
1363 size_t min_new = preferred_max_new_size;
1364 if (FLAG_IS_CMDLINE(NewSize)) {
1365 min_new = NewSize;
1366 }
1367 if (max_heap > min_new && min_heap_size() > min_new) {
1368 // Unless explicitly requested otherwise, make young gen
1369 // at least min_new, and at most preferred_max_new_size.
1370 if (FLAG_IS_DEFAULT(NewSize)) {
1371 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1372 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1373 if (PrintGCDetails && Verbose) {
1374 // Too early to use gclog_or_tty
1375 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1376 }
1377 }
1378 // Unless explicitly requested otherwise, size old gen
1379 // so it's NewRatio x of NewSize.
1380 if (FLAG_IS_DEFAULT(OldSize)) {
1381 if (max_heap > NewSize) {
1382 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1383 if (PrintGCDetails && Verbose) {
1384 // Too early to use gclog_or_tty
1385 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1386 }
1387 }
1388 }
1389 }
1390 }
1391 // Unless explicitly requested otherwise, definitely
1392 // promote all objects surviving "tenuring_default" scavenges.
1393 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1394 FLAG_IS_DEFAULT(SurvivorRatio)) {
1395 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1396 }
1397 // If we decided above (or user explicitly requested)
1398 // `promote all' (via MaxTenuringThreshold := 0),
1399 // prefer minuscule survivor spaces so as not to waste
1400 // space for (non-existent) survivors
1401 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1402 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1403 }
1404
1405 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1406 // but rather the number of free blocks of a given size that are used when
1407 // replenishing the local per-worker free list caches.
1408 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1409 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1410 // OldPLAB sizing manually turned off: Use a larger default setting,
1411 // unless it was manually specified. This is because a too-low value
1412 // will slow down scavenges.
1413 FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1414 } else {
1415 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1416 }
1417 }
1418
1419 // If either of the static initialization defaults have changed, note this
1420 // modification.
1421 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1422 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1423 }
1424 if (PrintGCDetails && Verbose) {
1425 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1426 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1427 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1428 }
1429 }
1430 #endif // INCLUDE_ALL_GCS
1431
1432 void set_object_alignment() {
1433 // Object alignment.
1434 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1435 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1436 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1437 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1438 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1439 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1440
1441 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1442 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1443
1444 // Oop encoding heap max
1445 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1446
1447 #if INCLUDE_ALL_GCS
1448 // Set CMS global values
1449 CompactibleFreeListSpace::set_cms_values();
1450 #endif // INCLUDE_ALL_GCS
1451 }
1452
1453 bool verify_object_alignment() {
1454 // Object alignment.
1455 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1456 jio_fprintf(defaultStream::error_stream(),
1457 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1458 (int)ObjectAlignmentInBytes);
1459 return false;
1460 }
1461 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1462 jio_fprintf(defaultStream::error_stream(),
1463 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1464 (int)ObjectAlignmentInBytes, BytesPerLong);
1465 return false;
1466 }
1467 // It does not make sense to have big object alignment
1468 // since a space lost due to alignment will be greater
1469 // then a saved space from compressed oops.
1470 if ((int)ObjectAlignmentInBytes > 256) {
1471 jio_fprintf(defaultStream::error_stream(),
1472 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1473 (int)ObjectAlignmentInBytes);
1474 return false;
1475 }
1476 // In case page size is very small.
1477 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1478 jio_fprintf(defaultStream::error_stream(),
1479 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1480 (int)ObjectAlignmentInBytes, os::vm_page_size());
1481 return false;
1482 }
1483 if(SurvivorAlignmentInBytes == 0) {
1484 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1485 } else {
1486 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1487 jio_fprintf(defaultStream::error_stream(),
1488 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1489 (int)SurvivorAlignmentInBytes);
1490 return false;
1491 }
1492 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1493 jio_fprintf(defaultStream::error_stream(),
1494 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1495 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1496 return false;
1497 }
1498 }
1499 return true;
1500 }
1501
1502 size_t Arguments::max_heap_for_compressed_oops() {
1503 // Avoid sign flip.
1504 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1505 // We need to fit both the NULL page and the heap into the memory budget, while
1506 // keeping alignment constraints of the heap. To guarantee the latter, as the
1507 // NULL page is located before the heap, we pad the NULL page to the conservative
1508 // maximum alignment that the GC may ever impose upon the heap.
1509 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1510 _conservative_max_heap_alignment);
1511
1512 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1513 NOT_LP64(ShouldNotReachHere(); return 0);
1514 }
1515
1516 bool Arguments::should_auto_select_low_pause_collector() {
1517 if (UseAutoGCSelectPolicy &&
1518 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1519 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1520 if (PrintGCDetails) {
1521 // Cannot use gclog_or_tty yet.
1522 tty->print_cr("Automatic selection of the low pause collector"
1523 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1524 }
1525 return true;
1526 }
1527 return false;
1528 }
1529
1530 void Arguments::set_use_compressed_oops() {
1531 #ifndef ZERO
1532 #ifdef _LP64
1533 // MaxHeapSize is not set up properly at this point, but
1534 // the only value that can override MaxHeapSize if we are
1535 // to use UseCompressedOops is InitialHeapSize.
1536 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1537
1538 if (max_heap_size <= max_heap_for_compressed_oops()) {
1539 #if !defined(COMPILER1) || defined(TIERED)
1540 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1541 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1542 }
1543 #endif
1544 } else {
1545 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1546 warning("Max heap size too large for Compressed Oops");
1547 FLAG_SET_DEFAULT(UseCompressedOops, false);
1548 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1549 }
1550 }
1551 #endif // _LP64
1552 #endif // ZERO
1553 }
1554
1555
1556 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1557 // set_use_compressed_oops().
1558 void Arguments::set_use_compressed_klass_ptrs() {
1559 #ifndef ZERO
1560 #ifdef _LP64
1561 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1562 if (!UseCompressedOops) {
1563 if (UseCompressedClassPointers) {
1564 warning("UseCompressedClassPointers requires UseCompressedOops");
1565 }
1566 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1567 } else {
1568 // Turn on UseCompressedClassPointers too
1569 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1570 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1571 }
1572 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1573 if (UseCompressedClassPointers) {
1574 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1575 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1576 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1577 }
1578 }
1579 }
1580 #endif // _LP64
1581 #endif // !ZERO
1582 }
1583
1584 void Arguments::set_conservative_max_heap_alignment() {
1585 // The conservative maximum required alignment for the heap is the maximum of
1586 // the alignments imposed by several sources: any requirements from the heap
1587 // itself, the collector policy and the maximum page size we may run the VM
1588 // with.
1589 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1590 #if INCLUDE_ALL_GCS
1591 if (UseParallelGC) {
1592 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1593 } else if (UseG1GC) {
1594 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1595 }
1596 #endif // INCLUDE_ALL_GCS
1597 _conservative_max_heap_alignment = MAX4(heap_alignment,
1598 (size_t)os::vm_allocation_granularity(),
1599 os::max_page_size(),
1600 CollectorPolicy::compute_heap_alignment());
1601 }
1602
1603 void Arguments::select_gc_ergonomically() {
1604 if (os::is_server_class_machine()) {
1605 if (should_auto_select_low_pause_collector()) {
1606 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1607 } else {
1608 FLAG_SET_ERGO(bool, UseParallelGC, true);
1609 }
1610 }
1611 }
1612
1613 void Arguments::select_gc() {
1614 if (!gc_selected()) {
1615 ArgumentsExt::select_gc_ergonomically();
1616 }
1617 }
1618
1619 void Arguments::set_ergonomics_flags() {
1620 select_gc();
1621
1622 #ifdef COMPILER2
1623 // Shared spaces work fine with other GCs but causes bytecode rewriting
1624 // to be disabled, which hurts interpreter performance and decreases
1625 // server performance. When -server is specified, keep the default off
1626 // unless it is asked for. Future work: either add bytecode rewriting
1627 // at link time, or rewrite bytecodes in non-shared methods.
1628 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1629 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1630 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1631 }
1632 #endif
1633
1634 set_conservative_max_heap_alignment();
1635
1636 #ifndef ZERO
1637 #ifdef _LP64
1638 set_use_compressed_oops();
1639
1640 // set_use_compressed_klass_ptrs() must be called after calling
1641 // set_use_compressed_oops().
1642 set_use_compressed_klass_ptrs();
1643
1644 // Also checks that certain machines are slower with compressed oops
1645 // in vm_version initialization code.
1646 #endif // _LP64
1647 #endif // !ZERO
1648 }
1649
1650 void Arguments::set_parallel_gc_flags() {
1651 assert(UseParallelGC || UseParallelOldGC, "Error");
1652 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1653 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1654 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1655 }
1656 FLAG_SET_DEFAULT(UseParallelGC, true);
1657
1658 // If no heap maximum was requested explicitly, use some reasonable fraction
1659 // of the physical memory, up to a maximum of 1GB.
1660 FLAG_SET_DEFAULT(ParallelGCThreads,
1661 Abstract_VM_Version::parallel_worker_threads());
1662 if (ParallelGCThreads == 0) {
1663 jio_fprintf(defaultStream::error_stream(),
1664 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1665 vm_exit(1);
1666 }
1667
1668 if (UseAdaptiveSizePolicy) {
1669 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1670 // unless the user actually sets these flags.
1671 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1672 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1673 _min_heap_free_ratio = MinHeapFreeRatio;
1674 }
1675 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1676 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1677 _max_heap_free_ratio = MaxHeapFreeRatio;
1678 }
1679 }
1680
1681 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1682 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1683 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1684 // See CR 6362902 for details.
1685 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1686 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1687 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1688 }
1689 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1690 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1691 }
1692 }
1693
1694 if (UseParallelOldGC) {
1695 // Par compact uses lower default values since they are treated as
1696 // minimums. These are different defaults because of the different
1697 // interpretation and are not ergonomically set.
1698 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1699 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1700 }
1701 }
1702 }
1703
1704 void Arguments::set_g1_gc_flags() {
1705 assert(UseG1GC, "Error");
1706 #ifdef COMPILER1
1707 FastTLABRefill = false;
1708 #endif
1709 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1710 if (ParallelGCThreads == 0) {
1711 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1712 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1713 }
1714
1715 #if INCLUDE_ALL_GCS
1716 if (G1ConcRefinementThreads == 0) {
1717 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1718 }
1719 #endif
1720
1721 // MarkStackSize will be set (if it hasn't been set by the user)
1722 // when concurrent marking is initialized.
1723 // Its value will be based upon the number of parallel marking threads.
1724 // But we do set the maximum mark stack size here.
1725 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1726 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1727 }
1728
1729 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1730 // In G1, we want the default GC overhead goal to be higher than
1731 // say in PS. So we set it here to 10%. Otherwise the heap might
1732 // be expanded more aggressively than we would like it to. In
1733 // fact, even 10% seems to not be high enough in some cases
1734 // (especially small GC stress tests that the main thing they do
1735 // is allocation). We might consider increase it further.
1736 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1737 }
1738
1739 if (PrintGCDetails && Verbose) {
1740 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1741 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1742 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1743 }
1744 }
1745
1746 #if !INCLUDE_ALL_GCS
1747 #ifdef ASSERT
1748 static bool verify_serial_gc_flags() {
1749 return (UseSerialGC &&
1750 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1751 UseParallelGC || UseParallelOldGC));
1752 }
1753 #endif // ASSERT
1754 #endif // INCLUDE_ALL_GCS
1755
1756 void Arguments::set_gc_specific_flags() {
1757 #if INCLUDE_ALL_GCS
1758 // Set per-collector flags
1759 if (UseParallelGC || UseParallelOldGC) {
1760 set_parallel_gc_flags();
1761 } else if (UseConcMarkSweepGC) {
1762 set_cms_and_parnew_gc_flags();
1763 } else if (UseG1GC) {
1764 set_g1_gc_flags();
1765 }
1766 check_deprecated_gc_flags();
1767 if (AssumeMP && !UseSerialGC) {
1768 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1769 warning("If the number of processors is expected to increase from one, then"
1770 " you should configure the number of parallel GC threads appropriately"
1771 " using -XX:ParallelGCThreads=N");
1772 }
1773 }
1774 if (MinHeapFreeRatio == 100) {
1775 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1776 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1777 }
1778 #else // INCLUDE_ALL_GCS
1779 assert(verify_serial_gc_flags(), "SerialGC unset");
1780 #endif // INCLUDE_ALL_GCS
1781 }
1782
1783 julong Arguments::limit_by_allocatable_memory(julong limit) {
1784 julong max_allocatable;
1785 julong result = limit;
1786 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1787 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1788 }
1789 return result;
1790 }
1791
1792 // Use static initialization to get the default before parsing
1793 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1794
1795 void Arguments::set_heap_size() {
1796 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1797 // Deprecated flag
1798 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1799 }
1800
1801 const julong phys_mem =
1802 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1803 : (julong)MaxRAM;
1804
1805 // If the maximum heap size has not been set with -Xmx,
1806 // then set it as fraction of the size of physical memory,
1807 // respecting the maximum and minimum sizes of the heap.
1808 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1809 julong reasonable_max = phys_mem / MaxRAMFraction;
1810
1811 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1812 // Small physical memory, so use a minimum fraction of it for the heap
1813 reasonable_max = phys_mem / MinRAMFraction;
1814 } else {
1815 // Not-small physical memory, so require a heap at least
1816 // as large as MaxHeapSize
1817 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1818 }
1819 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1820 // Limit the heap size to ErgoHeapSizeLimit
1821 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1822 }
1823 if (UseCompressedOops) {
1824 // Limit the heap size to the maximum possible when using compressed oops
1825 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1826
1827 // HeapBaseMinAddress can be greater than default but not less than.
1828 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1829 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1830 // matches compressed oops printing flags
1831 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1832 jio_fprintf(defaultStream::error_stream(),
1833 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1834 " (" UINTX_FORMAT "G) which is greater than value given "
1835 UINTX_FORMAT "\n",
1836 DefaultHeapBaseMinAddress,
1837 DefaultHeapBaseMinAddress/G,
1838 HeapBaseMinAddress);
1839 }
1840 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1841 }
1842 }
1843
1844 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1845 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1846 // but it should be not less than default MaxHeapSize.
1847 max_coop_heap -= HeapBaseMinAddress;
1848 }
1849 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1850 }
1851 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1852
1853 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1854 // An initial heap size was specified on the command line,
1855 // so be sure that the maximum size is consistent. Done
1856 // after call to limit_by_allocatable_memory because that
1857 // method might reduce the allocation size.
1858 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1859 }
1860
1861 if (PrintGCDetails && Verbose) {
1862 // Cannot use gclog_or_tty yet.
1863 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1864 }
1865 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1866 }
1867
1868 // If the minimum or initial heap_size have not been set or requested to be set
1869 // ergonomically, set them accordingly.
1870 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1871 julong reasonable_minimum = (julong)(OldSize + NewSize);
1872
1873 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1874
1875 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1876
1877 if (InitialHeapSize == 0) {
1878 julong reasonable_initial = phys_mem / InitialRAMFraction;
1879
1880 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1881 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1882
1883 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1884
1885 if (PrintGCDetails && Verbose) {
1886 // Cannot use gclog_or_tty yet.
1887 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1888 }
1889 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1890 }
1891 // If the minimum heap size has not been set (via -Xms),
1892 // synchronize with InitialHeapSize to avoid errors with the default value.
1893 if (min_heap_size() == 0) {
1894 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1895 if (PrintGCDetails && Verbose) {
1896 // Cannot use gclog_or_tty yet.
1897 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1898 }
1899 }
1900 }
1901 }
1902
1903 // This must be called after ergonomics because we want bytecode rewriting
1904 // if the server compiler is used, or if UseSharedSpaces is disabled.
1905 void Arguments::set_bytecode_flags() {
1906 // Better not attempt to store into a read-only space.
1907 if (UseSharedSpaces) {
1908 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1909 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1910 }
1911
1912 if (!RewriteBytecodes) {
1913 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1914 }
1915 }
1916
1917 // Aggressive optimization flags -XX:+AggressiveOpts
1918 void Arguments::set_aggressive_opts_flags() {
1919 #ifdef COMPILER2
1920 if (AggressiveUnboxing) {
1921 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1922 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1923 } else if (!EliminateAutoBox) {
1924 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1925 AggressiveUnboxing = false;
1926 }
1927 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1928 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1929 } else if (!DoEscapeAnalysis) {
1930 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1931 AggressiveUnboxing = false;
1932 }
1933 }
1934 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1935 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1936 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1937 }
1938 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1939 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1940 }
1941
1942 // Feed the cache size setting into the JDK
1943 char buffer[1024];
1944 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1945 add_property(buffer);
1946 }
1947 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1948 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1949 }
1950 #endif
1951
1952 if (AggressiveOpts) {
1953 // Sample flag setting code
1954 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1955 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1956 // }
1957 }
1958 }
1959
1960 //===========================================================================================================
1961 // Parsing of java.compiler property
1962
1963 void Arguments::process_java_compiler_argument(char* arg) {
1964 // For backwards compatibility, Djava.compiler=NONE or ""
1965 // causes us to switch to -Xint mode UNLESS -Xdebug
1966 // is also specified.
1967 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1968 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1969 }
1970 }
1971
1972 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1973 _sun_java_launcher = os::strdup_check_oom(launcher);
1974 }
1975
1976 bool Arguments::created_by_java_launcher() {
1977 assert(_sun_java_launcher != NULL, "property must have value");
1978 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1979 }
1980
1981 bool Arguments::sun_java_launcher_is_altjvm() {
1982 return _sun_java_launcher_is_altjvm;
1983 }
1984
1985 //===========================================================================================================
1986 // Parsing of main arguments
1987
1988 bool Arguments::verify_interval(uintx val, uintx min,
1989 uintx max, const char* name) {
1990 // Returns true iff value is in the inclusive interval [min..max]
1991 // false, otherwise.
1992 if (val >= min && val <= max) {
1993 return true;
1994 }
1995 jio_fprintf(defaultStream::error_stream(),
1996 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1997 " and " UINTX_FORMAT "\n",
1998 name, val, min, max);
1999 return false;
2000 }
2001
2002 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2003 // Returns true if given value is at least specified min threshold
2004 // false, otherwise.
2005 if (val >= min ) {
2006 return true;
2007 }
2008 jio_fprintf(defaultStream::error_stream(),
2009 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2010 name, val, min);
2011 return false;
2012 }
2013
2014 bool Arguments::verify_percentage(uintx value, const char* name) {
2015 if (is_percentage(value)) {
2016 return true;
2017 }
2018 jio_fprintf(defaultStream::error_stream(),
2019 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2020 name, value);
2021 return false;
2022 }
2023
2024 // check if do gclog rotation
2025 // +UseGCLogFileRotation is a must,
2026 // no gc log rotation when log file not supplied or
2027 // NumberOfGCLogFiles is 0
2028 void check_gclog_consistency() {
2029 if (UseGCLogFileRotation) {
2030 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2031 jio_fprintf(defaultStream::output_stream(),
2032 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2033 "where num_of_file > 0\n"
2034 "GC log rotation is turned off\n");
2035 UseGCLogFileRotation = false;
2036 }
2037 }
2038
2039 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2040 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2041 jio_fprintf(defaultStream::output_stream(),
2042 "GCLogFileSize changed to minimum 8K\n");
2043 }
2044 }
2045
2046 // This function is called for -Xloggc:<filename>, it can be used
2047 // to check if a given file name(or string) conforms to the following
2048 // specification:
2049 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2050 // %p and %t only allowed once. We only limit usage of filename not path
2051 bool is_filename_valid(const char *file_name) {
2052 const char* p = file_name;
2053 char file_sep = os::file_separator()[0];
2054 const char* cp;
2055 // skip prefix path
2056 for (cp = file_name; *cp != '\0'; cp++) {
2057 if (*cp == '/' || *cp == file_sep) {
2058 p = cp + 1;
2059 }
2060 }
2061
2062 int count_p = 0;
2063 int count_t = 0;
2064 while (*p != '\0') {
2065 if ((*p >= '0' && *p <= '9') ||
2066 (*p >= 'A' && *p <= 'Z') ||
2067 (*p >= 'a' && *p <= 'z') ||
2068 *p == '-' ||
2069 *p == '_' ||
2070 *p == '.') {
2071 p++;
2072 continue;
2073 }
2074 if (*p == '%') {
2075 if(*(p + 1) == 'p') {
2076 p += 2;
2077 count_p ++;
2078 continue;
2079 }
2080 if (*(p + 1) == 't') {
2081 p += 2;
2082 count_t ++;
2083 continue;
2084 }
2085 }
2086 return false;
2087 }
2088 return count_p < 2 && count_t < 2;
2089 }
2090
2091 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2092 if (!is_percentage(min_heap_free_ratio)) {
2093 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2094 return false;
2095 }
2096 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2097 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2098 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2099 MaxHeapFreeRatio);
2100 return false;
2101 }
2102 // This does not set the flag itself, but stores the value in a safe place for later usage.
2103 _min_heap_free_ratio = min_heap_free_ratio;
2104 return true;
2105 }
2106
2107 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2108 if (!is_percentage(max_heap_free_ratio)) {
2109 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2110 return false;
2111 }
2112 if (max_heap_free_ratio < MinHeapFreeRatio) {
2113 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2114 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2115 MinHeapFreeRatio);
2116 return false;
2117 }
2118 // This does not set the flag itself, but stores the value in a safe place for later usage.
2119 _max_heap_free_ratio = max_heap_free_ratio;
2120 return true;
2121 }
2122
2123 // Check consistency of GC selection
2124 bool Arguments::check_gc_consistency_user() {
2125 check_gclog_consistency();
2126 // Ensure that the user has not selected conflicting sets
2127 // of collectors.
2128 uint i = 0;
2129 if (UseSerialGC) i++;
2130 if (UseConcMarkSweepGC) i++;
2131 if (UseParallelGC || UseParallelOldGC) i++;
2132 if (UseG1GC) i++;
2133 if (i > 1) {
2134 jio_fprintf(defaultStream::error_stream(),
2135 "Conflicting collector combinations in option list; "
2136 "please refer to the release notes for the combinations "
2137 "allowed\n");
2138 return false;
2139 }
2140
2141 if (UseConcMarkSweepGC && !UseParNewGC) {
2142 jio_fprintf(defaultStream::error_stream(),
2143 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2144 return false;
2145 }
2146
2147 if (UseParNewGC && !UseConcMarkSweepGC) {
2148 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2149 // set up UseSerialGC properly, so that can't be used in the check here.
2150 jio_fprintf(defaultStream::error_stream(),
2151 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2152 return false;
2153 }
2154
2155 return true;
2156 }
2157
2158 void Arguments::check_deprecated_gc_flags() {
2159 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2160 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2161 }
2162 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2163 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2164 "and will likely be removed in future release");
2165 }
2166 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2167 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2168 "Use MaxRAMFraction instead.");
2169 }
2170 }
2171
2172 // Check stack pages settings
2173 bool Arguments::check_stack_pages()
2174 {
2175 bool status = true;
2176 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2177 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2178 // greater stack shadow pages can't generate instruction to bang stack
2179 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2180 return status;
2181 }
2182
2183 // Check the consistency of vm_init_args
2184 bool Arguments::check_vm_args_consistency() {
2185 // Method for adding checks for flag consistency.
2186 // The intent is to warn the user of all possible conflicts,
2187 // before returning an error.
2188 // Note: Needs platform-dependent factoring.
2189 bool status = true;
2190
2191 if (TLABRefillWasteFraction == 0) {
2192 jio_fprintf(defaultStream::error_stream(),
2193 "TLABRefillWasteFraction should be a denominator, "
2194 "not " SIZE_FORMAT "\n",
2195 TLABRefillWasteFraction);
2196 status = false;
2197 }
2198
2199 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2200 "AdaptiveSizePolicyWeight");
2201 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2202
2203 // Divide by bucket size to prevent a large size from causing rollover when
2204 // calculating amount of memory needed to be allocated for the String table.
2205 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2206 (max_uintx / StringTable::bucket_size()), "StringTable size");
2207
2208 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2209 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2210
2211 {
2212 // Using "else if" below to avoid printing two error messages if min > max.
2213 // This will also prevent us from reporting both min>100 and max>100 at the
2214 // same time, but that is less annoying than printing two identical errors IMHO.
2215 FormatBuffer<80> err_msg("%s","");
2216 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2217 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2218 status = false;
2219 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2220 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2221 status = false;
2222 }
2223 }
2224
2225 // Min/MaxMetaspaceFreeRatio
2226 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2227 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2228
2229 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2230 jio_fprintf(defaultStream::error_stream(),
2231 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2232 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2233 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2234 MinMetaspaceFreeRatio,
2235 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2236 MaxMetaspaceFreeRatio);
2237 status = false;
2238 }
2239
2240 // Trying to keep 100% free is not practical
2241 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2242
2243 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2244 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2245 }
2246
2247 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2248 // Settings to encourage splitting.
2249 if (!FLAG_IS_CMDLINE(NewRatio)) {
2250 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2251 }
2252 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2253 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2254 }
2255 }
2256
2257 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2258 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2259 }
2260
2261 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2262 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2263 if (GCTimeLimit == 100) {
2264 // Turn off gc-overhead-limit-exceeded checks
2265 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2266 }
2267
2268 status = status && check_gc_consistency_user();
2269 status = status && check_stack_pages();
2270
2271 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2272 "CMSIncrementalSafetyFactor");
2273
2274 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2275 // insists that we hold the requisite locks so that the iteration is
2276 // MT-safe. For the verification at start-up and shut-down, we don't
2277 // yet have a good way of acquiring and releasing these locks,
2278 // which are not visible at the CollectedHeap level. We want to
2279 // be able to acquire these locks and then do the iteration rather
2280 // than just disable the lock verification. This will be fixed under
2281 // bug 4788986.
2282 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2283 if (VerifyDuringStartup) {
2284 warning("Heap verification at start-up disabled "
2285 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2286 VerifyDuringStartup = false; // Disable verification at start-up
2287 }
2288
2289 if (VerifyBeforeExit) {
2290 warning("Heap verification at shutdown disabled "
2291 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2292 VerifyBeforeExit = false; // Disable verification at shutdown
2293 }
2294 }
2295
2296 // Note: only executed in non-PRODUCT mode
2297 if (!UseAsyncConcMarkSweepGC &&
2298 (ExplicitGCInvokesConcurrent ||
2299 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2300 jio_fprintf(defaultStream::error_stream(),
2301 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2302 " with -UseAsyncConcMarkSweepGC");
2303 status = false;
2304 }
2305
2306 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2307
2308 #if INCLUDE_ALL_GCS
2309 if (UseG1GC) {
2310 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2311 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2312 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2313
2314 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2315 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2316 "InitiatingHeapOccupancyPercent");
2317 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2318 "G1RefProcDrainInterval");
2319 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2320 "G1ConcMarkStepDurationMillis");
2321 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2322 "G1ConcRSHotCardLimit");
2323 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2324 "G1ConcRSLogCacheSize");
2325 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2326 "StringDeduplicationAgeThreshold");
2327 }
2328 if (UseConcMarkSweepGC) {
2329 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2330 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2331 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2332 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2333
2334 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2335
2336 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2337 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2338 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2339
2340 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2341
2342 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2343 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2344
2345 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2346 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2347 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2348
2349 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2350
2351 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2352
2353 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2354 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2355 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2356 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2357 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2358 }
2359
2360 if (UseParallelGC || UseParallelOldGC) {
2361 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2362 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2363
2364 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2365 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2366
2367 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2368 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2369
2370 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2371
2372 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2373 }
2374 #endif // INCLUDE_ALL_GCS
2375
2376 status = status && verify_interval(RefDiscoveryPolicy,
2377 ReferenceProcessor::DiscoveryPolicyMin,
2378 ReferenceProcessor::DiscoveryPolicyMax,
2379 "RefDiscoveryPolicy");
2380
2381 // Limit the lower bound of this flag to 1 as it is used in a division
2382 // expression.
2383 status = status && verify_interval(TLABWasteTargetPercent,
2384 1, 100, "TLABWasteTargetPercent");
2385
2386 status = status && verify_object_alignment();
2387
2388 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2389 "CompressedClassSpaceSize");
2390
2391 status = status && verify_interval(MarkStackSizeMax,
2392 1, (max_jint - 1), "MarkStackSizeMax");
2393 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2394
2395 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2396
2397 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2398
2399 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2400
2401 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2402 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2403
2404 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2405
2406 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2407 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2408 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2409 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2410
2411 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2412 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2413
2414 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2415 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2416 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2417
2418 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2419 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2420
2421 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2422 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2423 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2424 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2425
2426 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2427 #ifdef COMPILER1
2428 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2429 #endif
2430 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2431
2432 if (PrintNMTStatistics) {
2433 #if INCLUDE_NMT
2434 if (MemTracker::tracking_level() == NMT_off) {
2435 #endif // INCLUDE_NMT
2436 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2437 PrintNMTStatistics = false;
2438 #if INCLUDE_NMT
2439 }
2440 #endif
2441 }
2442
2443 // Need to limit the extent of the padding to reasonable size.
2444 // 8K is well beyond the reasonable HW cache line size, even with the
2445 // aggressive prefetching, while still leaving the room for segregating
2446 // among the distinct pages.
2447 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2450 ContendedPaddingWidth, 0, 8192);
2451 status = false;
2452 }
2453
2454 // Need to enforce the padding not to break the existing field alignments.
2455 // It is sufficient to check against the largest type size.
2456 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2457 jio_fprintf(defaultStream::error_stream(),
2458 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2459 ContendedPaddingWidth, BytesPerLong);
2460 status = false;
2461 }
2462
2463 // Check lower bounds of the code cache
2464 // Template Interpreter code is approximately 3X larger in debug builds.
2465 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2466 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2467 jio_fprintf(defaultStream::error_stream(),
2468 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2469 os::vm_page_size()/K);
2470 status = false;
2471 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2474 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2475 status = false;
2476 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2479 min_code_cache_size/K);
2480 status = false;
2481 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2482 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2485 CODE_CACHE_SIZE_LIMIT/M);
2486 status = false;
2487 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2490 min_code_cache_size/K);
2491 status = false;
2492 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2493 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2494 jio_fprintf(defaultStream::error_stream(),
2495 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2496 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2497 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2498 status = false;
2499 }
2500
2501 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2502 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2503 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2504 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2505
2506
2507 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2508 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2509 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2510 // Check the minimum number of compiler threads
2511 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2512
2513 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2514 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2515 }
2516
2517 return status;
2518 }
2519
2520 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2521 const char* option_type) {
2522 if (ignore) return false;
2523
2524 const char* spacer = " ";
2525 if (option_type == NULL) {
2526 option_type = ++spacer; // Set both to the empty string.
2527 }
2528
2529 if (os::obsolete_option(option)) {
2530 jio_fprintf(defaultStream::error_stream(),
2531 "Obsolete %s%soption: %s\n", option_type, spacer,
2532 option->optionString);
2533 return false;
2534 } else {
2535 jio_fprintf(defaultStream::error_stream(),
2536 "Unrecognized %s%soption: %s\n", option_type, spacer,
2537 option->optionString);
2538 return true;
2539 }
2540 }
2541
2542 static const char* user_assertion_options[] = {
2543 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2544 };
2545
2546 static const char* system_assertion_options[] = {
2547 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2548 };
2549
2550 bool Arguments::parse_uintx(const char* value,
2551 uintx* uintx_arg,
2552 uintx min_size) {
2553
2554 // Check the sign first since atomull() parses only unsigned values.
2555 bool value_is_positive = !(*value == '-');
2556
2557 if (value_is_positive) {
2558 julong n;
2559 bool good_return = atomull(value, &n);
2560 if (good_return) {
2561 bool above_minimum = n >= min_size;
2562 bool value_is_too_large = n > max_uintx;
2563
2564 if (above_minimum && !value_is_too_large) {
2565 *uintx_arg = n;
2566 return true;
2567 }
2568 }
2569 }
2570 return false;
2571 }
2572
2573 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2574 julong* long_arg,
2575 julong min_size) {
2576 if (!atomull(s, long_arg)) return arg_unreadable;
2577 return check_memory_size(*long_arg, min_size);
2578 }
2579
2580 // Parse JavaVMInitArgs structure
2581
2582 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2583 // For components of the system classpath.
2584 SysClassPath scp(Arguments::get_sysclasspath());
2585 bool scp_assembly_required = false;
2586
2587 // Save default settings for some mode flags
2588 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2589 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2590 Arguments::_ClipInlining = ClipInlining;
2591 Arguments::_BackgroundCompilation = BackgroundCompilation;
2592
2593 // Setup flags for mixed which is the default
2594 set_mode_flags(_mixed);
2595
2596 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2597 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2598 if (result != JNI_OK) {
2599 return result;
2600 }
2601
2602 // Parse JavaVMInitArgs structure passed in
2603 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2604 if (result != JNI_OK) {
2605 return result;
2606 }
2607
2608 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2609 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2610 if (result != JNI_OK) {
2611 return result;
2612 }
2613
2614 // Do final processing now that all arguments have been parsed
2615 result = finalize_vm_init_args(&scp, scp_assembly_required);
2616 if (result != JNI_OK) {
2617 return result;
2618 }
2619
2620 return JNI_OK;
2621 }
2622
2623 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2624 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2625 // are dealing with -agentpath (case where name is a path), otherwise with
2626 // -agentlib
2627 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2628 char *_name;
2629 const char *_hprof = "hprof", *_jdwp = "jdwp";
2630 size_t _len_hprof, _len_jdwp, _len_prefix;
2631
2632 if (is_path) {
2633 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2634 return false;
2635 }
2636
2637 _name++; // skip past last path separator
2638 _len_prefix = strlen(JNI_LIB_PREFIX);
2639
2640 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2641 return false;
2642 }
2643
2644 _name += _len_prefix;
2645 _len_hprof = strlen(_hprof);
2646 _len_jdwp = strlen(_jdwp);
2647
2648 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2649 _name += _len_hprof;
2650 }
2651 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2652 _name += _len_jdwp;
2653 }
2654 else {
2655 return false;
2656 }
2657
2658 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2659 return false;
2660 }
2661
2662 return true;
2663 }
2664
2665 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2666 return true;
2667 }
2668
2669 return false;
2670 }
2671
2672 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2673 SysClassPath* scp_p,
2674 bool* scp_assembly_required_p,
2675 Flag::Flags origin) {
2676 // Remaining part of option string
2677 const char* tail;
2678
2679 // iterate over arguments
2680 for (int index = 0; index < args->nOptions; index++) {
2681 bool is_absolute_path = false; // for -agentpath vs -agentlib
2682
2683 const JavaVMOption* option = args->options + index;
2684
2685 if (!match_option(option, "-Djava.class.path", &tail) &&
2686 !match_option(option, "-Dsun.java.command", &tail) &&
2687 !match_option(option, "-Dsun.java.launcher", &tail)) {
2688
2689 // add all jvm options to the jvm_args string. This string
2690 // is used later to set the java.vm.args PerfData string constant.
2691 // the -Djava.class.path and the -Dsun.java.command options are
2692 // omitted from jvm_args string as each have their own PerfData
2693 // string constant object.
2694 build_jvm_args(option->optionString);
2695 }
2696
2697 // -verbose:[class/gc/jni]
2698 if (match_option(option, "-verbose", &tail)) {
2699 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2700 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2701 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2702 } else if (!strcmp(tail, ":gc")) {
2703 FLAG_SET_CMDLINE(bool, PrintGC, true);
2704 } else if (!strcmp(tail, ":jni")) {
2705 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2706 }
2707 // -da / -ea / -disableassertions / -enableassertions
2708 // These accept an optional class/package name separated by a colon, e.g.,
2709 // -da:java.lang.Thread.
2710 } else if (match_option(option, user_assertion_options, &tail, true)) {
2711 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2712 if (*tail == '\0') {
2713 JavaAssertions::setUserClassDefault(enable);
2714 } else {
2715 assert(*tail == ':', "bogus match by match_option()");
2716 JavaAssertions::addOption(tail + 1, enable);
2717 }
2718 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2719 } else if (match_option(option, system_assertion_options, &tail, false)) {
2720 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2721 JavaAssertions::setSystemClassDefault(enable);
2722 // -bootclasspath:
2723 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2724 scp_p->reset_path(tail);
2725 *scp_assembly_required_p = true;
2726 // -bootclasspath/a:
2727 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2728 scp_p->add_suffix(tail);
2729 *scp_assembly_required_p = true;
2730 // -bootclasspath/p:
2731 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2732 scp_p->add_prefix(tail);
2733 *scp_assembly_required_p = true;
2734 // -Xrun
2735 } else if (match_option(option, "-Xrun", &tail)) {
2736 if (tail != NULL) {
2737 const char* pos = strchr(tail, ':');
2738 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2739 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2740 name[len] = '\0';
2741
2742 char *options = NULL;
2743 if(pos != NULL) {
2744 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2745 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2746 }
2747 #if !INCLUDE_JVMTI
2748 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "Profiling and debugging agents are not supported in this VM\n");
2751 return JNI_ERR;
2752 }
2753 #endif // !INCLUDE_JVMTI
2754 add_init_library(name, options);
2755 }
2756 // -agentlib and -agentpath
2757 } else if (match_option(option, "-agentlib:", &tail) ||
2758 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2759 if(tail != NULL) {
2760 const char* pos = strchr(tail, '=');
2761 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2762 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2763 name[len] = '\0';
2764
2765 char *options = NULL;
2766 if(pos != NULL) {
2767 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2768 }
2769 #if !INCLUDE_JVMTI
2770 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Profiling and debugging agents are not supported in this VM\n");
2773 return JNI_ERR;
2774 }
2775 #endif // !INCLUDE_JVMTI
2776 add_init_agent(name, options, is_absolute_path);
2777 }
2778 // -javaagent
2779 } else if (match_option(option, "-javaagent:", &tail)) {
2780 #if !INCLUDE_JVMTI
2781 jio_fprintf(defaultStream::error_stream(),
2782 "Instrumentation agents are not supported in this VM\n");
2783 return JNI_ERR;
2784 #else
2785 if(tail != NULL) {
2786 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2787 add_init_agent("instrument", options, false);
2788 }
2789 #endif // !INCLUDE_JVMTI
2790 // -Xnoclassgc
2791 } else if (match_option(option, "-Xnoclassgc")) {
2792 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2793 // -Xconcgc
2794 } else if (match_option(option, "-Xconcgc")) {
2795 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2796 // -Xnoconcgc
2797 } else if (match_option(option, "-Xnoconcgc")) {
2798 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2799 // -Xbatch
2800 } else if (match_option(option, "-Xbatch")) {
2801 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2802 // -Xmn for compatibility with other JVM vendors
2803 } else if (match_option(option, "-Xmn", &tail)) {
2804 julong long_initial_young_size = 0;
2805 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2806 if (errcode != arg_in_range) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Invalid initial young generation size: %s\n", option->optionString);
2809 describe_range_error(errcode);
2810 return JNI_EINVAL;
2811 }
2812 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2813 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2814 // -Xms
2815 } else if (match_option(option, "-Xms", &tail)) {
2816 julong long_initial_heap_size = 0;
2817 // an initial heap size of 0 means automatically determine
2818 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2819 if (errcode != arg_in_range) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "Invalid initial heap size: %s\n", option->optionString);
2822 describe_range_error(errcode);
2823 return JNI_EINVAL;
2824 }
2825 set_min_heap_size((uintx)long_initial_heap_size);
2826 // Currently the minimum size and the initial heap sizes are the same.
2827 // Can be overridden with -XX:InitialHeapSize.
2828 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2829 // -Xmx
2830 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2831 julong long_max_heap_size = 0;
2832 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2833 if (errcode != arg_in_range) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Invalid maximum heap size: %s\n", option->optionString);
2836 describe_range_error(errcode);
2837 return JNI_EINVAL;
2838 }
2839 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2840 // Xmaxf
2841 } else if (match_option(option, "-Xmaxf", &tail)) {
2842 char* err;
2843 int maxf = (int)(strtod(tail, &err) * 100);
2844 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2845 jio_fprintf(defaultStream::error_stream(),
2846 "Bad max heap free percentage size: %s\n",
2847 option->optionString);
2848 return JNI_EINVAL;
2849 } else {
2850 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2851 }
2852 // Xminf
2853 } else if (match_option(option, "-Xminf", &tail)) {
2854 char* err;
2855 int minf = (int)(strtod(tail, &err) * 100);
2856 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2857 jio_fprintf(defaultStream::error_stream(),
2858 "Bad min heap free percentage size: %s\n",
2859 option->optionString);
2860 return JNI_EINVAL;
2861 } else {
2862 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2863 }
2864 // -Xss
2865 } else if (match_option(option, "-Xss", &tail)) {
2866 julong long_ThreadStackSize = 0;
2867 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2868 if (errcode != arg_in_range) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Invalid thread stack size: %s\n", option->optionString);
2871 describe_range_error(errcode);
2872 return JNI_EINVAL;
2873 }
2874 // Internally track ThreadStackSize in units of 1024 bytes.
2875 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2876 round_to((int)long_ThreadStackSize, K) / K);
2877 // -Xoss
2878 } else if (match_option(option, "-Xoss", &tail)) {
2879 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2880 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2881 julong long_CodeCacheExpansionSize = 0;
2882 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2883 if (errcode != arg_in_range) {
2884 jio_fprintf(defaultStream::error_stream(),
2885 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2886 os::vm_page_size()/K);
2887 return JNI_EINVAL;
2888 }
2889 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2890 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2891 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2892 julong long_ReservedCodeCacheSize = 0;
2893
2894 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2895 if (errcode != arg_in_range) {
2896 jio_fprintf(defaultStream::error_stream(),
2897 "Invalid maximum code cache size: %s.\n", option->optionString);
2898 return JNI_EINVAL;
2899 }
2900 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2901 // -XX:NonNMethodCodeHeapSize=
2902 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2903 julong long_NonNMethodCodeHeapSize = 0;
2904
2905 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2906 if (errcode != arg_in_range) {
2907 jio_fprintf(defaultStream::error_stream(),
2908 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2909 return JNI_EINVAL;
2910 }
2911 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2912 // -XX:ProfiledCodeHeapSize=
2913 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2914 julong long_ProfiledCodeHeapSize = 0;
2915
2916 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2917 if (errcode != arg_in_range) {
2918 jio_fprintf(defaultStream::error_stream(),
2919 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2920 return JNI_EINVAL;
2921 }
2922 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2923 // -XX:NonProfiledCodeHeapSizee=
2924 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2925 julong long_NonProfiledCodeHeapSize = 0;
2926
2927 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2928 if (errcode != arg_in_range) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2931 return JNI_EINVAL;
2932 }
2933 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2934 //-XX:IncreaseFirstTierCompileThresholdAt=
2935 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2936 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2937 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2940 option->optionString);
2941 return JNI_EINVAL;
2942 }
2943 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2944 // -green
2945 } else if (match_option(option, "-green")) {
2946 jio_fprintf(defaultStream::error_stream(),
2947 "Green threads support not available\n");
2948 return JNI_EINVAL;
2949 // -native
2950 } else if (match_option(option, "-native")) {
2951 // HotSpot always uses native threads, ignore silently for compatibility
2952 // -Xsqnopause
2953 } else if (match_option(option, "-Xsqnopause")) {
2954 // EVM option, ignore silently for compatibility
2955 // -Xrs
2956 } else if (match_option(option, "-Xrs")) {
2957 // Classic/EVM option, new functionality
2958 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2959 } else if (match_option(option, "-Xusealtsigs")) {
2960 // change default internal VM signals used - lower case for back compat
2961 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2962 // -Xoptimize
2963 } else if (match_option(option, "-Xoptimize")) {
2964 // EVM option, ignore silently for compatibility
2965 // -Xprof
2966 } else if (match_option(option, "-Xprof")) {
2967 #if INCLUDE_FPROF
2968 _has_profile = true;
2969 #else // INCLUDE_FPROF
2970 jio_fprintf(defaultStream::error_stream(),
2971 "Flat profiling is not supported in this VM.\n");
2972 return JNI_ERR;
2973 #endif // INCLUDE_FPROF
2974 // -Xconcurrentio
2975 } else if (match_option(option, "-Xconcurrentio")) {
2976 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2977 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2978 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2979 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2980 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2981
2982 // -Xinternalversion
2983 } else if (match_option(option, "-Xinternalversion")) {
2984 jio_fprintf(defaultStream::output_stream(), "%s\n",
2985 VM_Version::internal_vm_info_string());
2986 vm_exit(0);
2987 #ifndef PRODUCT
2988 // -Xprintflags
2989 } else if (match_option(option, "-Xprintflags")) {
2990 CommandLineFlags::printFlags(tty, false);
2991 vm_exit(0);
2992 #endif
2993 // -D
2994 } else if (match_option(option, "-D", &tail)) {
2995 const char* value;
2996 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2997 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2998 // abort if -Djava.endorsed.dirs is set
2999 jio_fprintf(defaultStream::output_stream(),
3000 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3001 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3002 return JNI_EINVAL;
3003 }
3004 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3005 *value != '\0' && strcmp(value, "\"\"") != 0) {
3006 // abort if -Djava.ext.dirs is set
3007 jio_fprintf(defaultStream::output_stream(),
3008 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3009 return JNI_EINVAL;
3010 }
3011
3012 if (!add_property(tail)) {
3013 return JNI_ENOMEM;
3014 }
3015 // Out of the box management support
3016 if (match_option(option, "-Dcom.sun.management", &tail)) {
3017 #if INCLUDE_MANAGEMENT
3018 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3019 #else
3020 jio_fprintf(defaultStream::output_stream(),
3021 "-Dcom.sun.management is not supported in this VM.\n");
3022 return JNI_ERR;
3023 #endif
3024 }
3025 // -Xint
3026 } else if (match_option(option, "-Xint")) {
3027 set_mode_flags(_int);
3028 // -Xmixed
3029 } else if (match_option(option, "-Xmixed")) {
3030 set_mode_flags(_mixed);
3031 // -Xcomp
3032 } else if (match_option(option, "-Xcomp")) {
3033 // for testing the compiler; turn off all flags that inhibit compilation
3034 set_mode_flags(_comp);
3035 // -Xshare:dump
3036 } else if (match_option(option, "-Xshare:dump")) {
3037 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3038 set_mode_flags(_int); // Prevent compilation, which creates objects
3039 // -Xshare:on
3040 } else if (match_option(option, "-Xshare:on")) {
3041 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3042 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3043 // -Xshare:auto
3044 } else if (match_option(option, "-Xshare:auto")) {
3045 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3046 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3047 // -Xshare:off
3048 } else if (match_option(option, "-Xshare:off")) {
3049 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3050 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3051 // -Xverify
3052 } else if (match_option(option, "-Xverify", &tail)) {
3053 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3054 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3055 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3056 } else if (strcmp(tail, ":remote") == 0) {
3057 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3058 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3059 } else if (strcmp(tail, ":none") == 0) {
3060 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3061 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3062 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3063 return JNI_EINVAL;
3064 }
3065 // -Xdebug
3066 } else if (match_option(option, "-Xdebug")) {
3067 // note this flag has been used, then ignore
3068 set_xdebug_mode(true);
3069 // -Xnoagent
3070 } else if (match_option(option, "-Xnoagent")) {
3071 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3072 } else if (match_option(option, "-Xboundthreads")) {
3073 // Bind user level threads to kernel threads (Solaris only)
3074 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3075 } else if (match_option(option, "-Xloggc:", &tail)) {
3076 // Redirect GC output to the file. -Xloggc:<filename>
3077 // ostream_init_log(), when called will use this filename
3078 // to initialize a fileStream.
3079 _gc_log_filename = os::strdup_check_oom(tail);
3080 if (!is_filename_valid(_gc_log_filename)) {
3081 jio_fprintf(defaultStream::output_stream(),
3082 "Invalid file name for use with -Xloggc: Filename can only contain the "
3083 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3084 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3085 return JNI_EINVAL;
3086 }
3087 FLAG_SET_CMDLINE(bool, PrintGC, true);
3088 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3089
3090 // JNI hooks
3091 } else if (match_option(option, "-Xcheck", &tail)) {
3092 if (!strcmp(tail, ":jni")) {
3093 #if !INCLUDE_JNI_CHECK
3094 warning("JNI CHECKING is not supported in this VM");
3095 #else
3096 CheckJNICalls = true;
3097 #endif // INCLUDE_JNI_CHECK
3098 } else if (is_bad_option(option, args->ignoreUnrecognized,
3099 "check")) {
3100 return JNI_EINVAL;
3101 }
3102 } else if (match_option(option, "vfprintf")) {
3103 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3104 } else if (match_option(option, "exit")) {
3105 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3106 } else if (match_option(option, "abort")) {
3107 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3108 // -XX:+AggressiveHeap
3109 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3110
3111 // This option inspects the machine and attempts to set various
3112 // parameters to be optimal for long-running, memory allocation
3113 // intensive jobs. It is intended for machines with large
3114 // amounts of cpu and memory.
3115
3116 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3117 // VM, but we may not be able to represent the total physical memory
3118 // available (like having 8gb of memory on a box but using a 32bit VM).
3119 // Thus, we need to make sure we're using a julong for intermediate
3120 // calculations.
3121 julong initHeapSize;
3122 julong total_memory = os::physical_memory();
3123
3124 if (total_memory < (julong)256*M) {
3125 jio_fprintf(defaultStream::error_stream(),
3126 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3127 vm_exit(1);
3128 }
3129
3130 // The heap size is half of available memory, or (at most)
3131 // all of possible memory less 160mb (leaving room for the OS
3132 // when using ISM). This is the maximum; because adaptive sizing
3133 // is turned on below, the actual space used may be smaller.
3134
3135 initHeapSize = MIN2(total_memory / (julong)2,
3136 total_memory - (julong)160*M);
3137
3138 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3139
3140 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3141 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3142 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3143 // Currently the minimum size and the initial heap sizes are the same.
3144 set_min_heap_size(initHeapSize);
3145 }
3146 if (FLAG_IS_DEFAULT(NewSize)) {
3147 // Make the young generation 3/8ths of the total heap.
3148 FLAG_SET_CMDLINE(uintx, NewSize,
3149 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3150 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3151 }
3152
3153 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3154 FLAG_SET_DEFAULT(UseLargePages, true);
3155 #endif
3156
3157 // Increase some data structure sizes for efficiency
3158 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3159 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3160 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3161
3162 // See the OldPLABSize comment below, but replace 'after promotion'
3163 // with 'after copying'. YoungPLABSize is the size of the survivor
3164 // space per-gc-thread buffers. The default is 4kw.
3165 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3166
3167 // OldPLABSize is the size of the buffers in the old gen that
3168 // UseParallelGC uses to promote live data that doesn't fit in the
3169 // survivor spaces. At any given time, there's one for each gc thread.
3170 // The default size is 1kw. These buffers are rarely used, since the
3171 // survivor spaces are usually big enough. For specjbb, however, there
3172 // are occasions when there's lots of live data in the young gen
3173 // and we end up promoting some of it. We don't have a definite
3174 // explanation for why bumping OldPLABSize helps, but the theory
3175 // is that a bigger PLAB results in retaining something like the
3176 // original allocation order after promotion, which improves mutator
3177 // locality. A minor effect may be that larger PLABs reduce the
3178 // number of PLAB allocation events during gc. The value of 8kw
3179 // was arrived at by experimenting with specjbb.
3180 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3181
3182 // Enable parallel GC and adaptive generation sizing
3183 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3184 FLAG_SET_DEFAULT(ParallelGCThreads,
3185 Abstract_VM_Version::parallel_worker_threads());
3186
3187 // Encourage steady state memory management
3188 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3189
3190 // This appears to improve mutator locality
3191 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3192
3193 // Get around early Solaris scheduling bug
3194 // (affinity vs other jobs on system)
3195 // but disallow DR and offlining (5008695).
3196 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3197
3198 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3199 // and the last option wins.
3200 } else if (match_option(option, "-XX:+NeverTenure")) {
3201 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3202 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3203 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3204 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3205 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3206 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3207 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3208 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3209 uintx max_tenuring_thresh = 0;
3210 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3211 jio_fprintf(defaultStream::error_stream(),
3212 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3213 }
3214 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3215
3216 if (MaxTenuringThreshold == 0) {
3217 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3218 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3219 } else {
3220 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3221 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3222 }
3223 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3224 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3225 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3226 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3227 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3228 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3229 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3230 #if defined(DTRACE_ENABLED)
3231 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3232 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3233 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3234 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3235 #else // defined(DTRACE_ENABLED)
3236 jio_fprintf(defaultStream::error_stream(),
3237 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3238 return JNI_EINVAL;
3239 #endif // defined(DTRACE_ENABLED)
3240 #ifdef ASSERT
3241 } else if (match_option(option, "-XX:+FullGCALot")) {
3242 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3243 // disable scavenge before parallel mark-compact
3244 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3245 #endif
3246 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3247 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3248 julong stack_size = 0;
3249 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3250 if (errcode != arg_in_range) {
3251 jio_fprintf(defaultStream::error_stream(),
3252 "Invalid mark stack size: %s\n", option->optionString);
3253 describe_range_error(errcode);
3254 return JNI_EINVAL;
3255 }
3256 jio_fprintf(defaultStream::error_stream(),
3257 "Please use -XX:MarkStackSize in place of "
3258 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3259 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3260 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3261 julong max_stack_size = 0;
3262 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3263 if (errcode != arg_in_range) {
3264 jio_fprintf(defaultStream::error_stream(),
3265 "Invalid maximum mark stack size: %s\n",
3266 option->optionString);
3267 describe_range_error(errcode);
3268 return JNI_EINVAL;
3269 }
3270 jio_fprintf(defaultStream::error_stream(),
3271 "Please use -XX:MarkStackSizeMax in place of "
3272 "-XX:CMSMarkStackSizeMax in the future\n");
3273 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3274 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3275 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3276 uintx conc_threads = 0;
3277 if (!parse_uintx(tail, &conc_threads, 1)) {
3278 jio_fprintf(defaultStream::error_stream(),
3279 "Invalid concurrent threads: %s\n", option->optionString);
3280 return JNI_EINVAL;
3281 }
3282 jio_fprintf(defaultStream::error_stream(),
3283 "Please use -XX:ConcGCThreads in place of "
3284 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3285 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3286 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3287 julong max_direct_memory_size = 0;
3288 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3289 if (errcode != arg_in_range) {
3290 jio_fprintf(defaultStream::error_stream(),
3291 "Invalid maximum direct memory size: %s\n",
3292 option->optionString);
3293 describe_range_error(errcode);
3294 return JNI_EINVAL;
3295 }
3296 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3297 #if !INCLUDE_MANAGEMENT
3298 } else if (match_option(option, "-XX:+ManagementServer")) {
3299 jio_fprintf(defaultStream::error_stream(),
3300 "ManagementServer is not supported in this VM.\n");
3301 return JNI_ERR;
3302 #endif // INCLUDE_MANAGEMENT
3303 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3304 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash", &tail)) {
3305 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true);
3306 jio_fprintf(defaultStream::output_stream(),
3307 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3308 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash", &tail)) {
3309 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false);
3310 jio_fprintf(defaultStream::output_stream(),
3311 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3312 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3313 // Skip -XX:Flags= since that case has already been handled
3314 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3315 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3316 return JNI_EINVAL;
3317 }
3318 }
3319 // Unknown option
3320 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3321 return JNI_ERR;
3322 }
3323 }
3324
3325 // PrintSharedArchiveAndExit will turn on
3326 // -Xshare:on
3327 // -XX:+TraceClassPaths
3328 if (PrintSharedArchiveAndExit) {
3329 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3330 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3331 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3332 }
3333
3334 // Change the default value for flags which have different default values
3335 // when working with older JDKs.
3336 #ifdef LINUX
3337 if (JDK_Version::current().compare_major(6) <= 0 &&
3338 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3339 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3340 }
3341 #endif // LINUX
3342 fix_appclasspath();
3343 return JNI_OK;
3344 }
3345
3346 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3347 //
3348 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3349 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3350 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3351 // path is treated as the current directory.
3352 //
3353 // This causes problems with CDS, which requires that all directories specified in the classpath
3354 // must be empty. In most cases, applications do NOT want to load classes from the current
3355 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3356 // scripts compatible with CDS.
3357 void Arguments::fix_appclasspath() {
3358 if (IgnoreEmptyClassPaths) {
3359 const char separator = *os::path_separator();
3360 const char* src = _java_class_path->value();
3361
3362 // skip over all the leading empty paths
3363 while (*src == separator) {
3364 src ++;
3365 }
3366
3367 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3368 strncpy(copy, src, strlen(src) + 1);
3369
3370 // trim all trailing empty paths
3371 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3372 *tail = '\0';
3373 }
3374
3375 char from[3] = {separator, separator, '\0'};
3376 char to [2] = {separator, '\0'};
3377 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3378 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3379 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3380 }
3381
3382 _java_class_path->set_value(copy);
3383 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3384 }
3385
3386 if (!PrintSharedArchiveAndExit) {
3387 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3388 }
3389 }
3390
3391 static bool has_jar_files(const char* directory) {
3392 DIR* dir = os::opendir(directory);
3393 if (dir == NULL) return false;
3394
3395 struct dirent *entry;
3396 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3397 bool hasJarFile = false;
3398 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3399 const char* name = entry->d_name;
3400 const char* ext = name + strlen(name) - 4;
3401 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3402 }
3403 FREE_C_HEAP_ARRAY(char, dbuf);
3404 os::closedir(dir);
3405 return hasJarFile ;
3406 }
3407
3408 static int check_non_empty_dirs(const char* path) {
3409 const char separator = *os::path_separator();
3410 const char* const end = path + strlen(path);
3411 int nonEmptyDirs = 0;
3412 while (path < end) {
3413 const char* tmp_end = strchr(path, separator);
3414 if (tmp_end == NULL) {
3415 if (has_jar_files(path)) {
3416 nonEmptyDirs++;
3417 jio_fprintf(defaultStream::output_stream(),
3418 "Non-empty directory: %s\n", path);
3419 }
3420 path = end;
3421 } else {
3422 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3423 memcpy(dirpath, path, tmp_end - path);
3424 dirpath[tmp_end - path] = '\0';
3425 if (has_jar_files(dirpath)) {
3426 nonEmptyDirs++;
3427 jio_fprintf(defaultStream::output_stream(),
3428 "Non-empty directory: %s\n", dirpath);
3429 }
3430 FREE_C_HEAP_ARRAY(char, dirpath);
3431 path = tmp_end + 1;
3432 }
3433 }
3434 return nonEmptyDirs;
3435 }
3436
3437 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3438 // check if the default lib/endorsed directory exists; if so, error
3439 char path[JVM_MAXPATHLEN];
3440 const char* fileSep = os::file_separator();
3441 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3442
3443 if (CheckEndorsedAndExtDirs) {
3444 int nonEmptyDirs = 0;
3445 // check endorsed directory
3446 nonEmptyDirs += check_non_empty_dirs(path);
3447 // check the extension directories
3448 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3449 if (nonEmptyDirs > 0) {
3450 return JNI_ERR;
3451 }
3452 }
3453
3454 DIR* dir = os::opendir(path);
3455 if (dir != NULL) {
3456 jio_fprintf(defaultStream::output_stream(),
3457 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3458 "in modular form will be supported via the concept of upgradeable modules.\n");
3459 os::closedir(dir);
3460 return JNI_ERR;
3461 }
3462
3463 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3464 dir = os::opendir(path);
3465 if (dir != NULL) {
3466 jio_fprintf(defaultStream::output_stream(),
3467 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3468 "Use -classpath instead.\n.");
3469 os::closedir(dir);
3470 return JNI_ERR;
3471 }
3472
3473 if (scp_assembly_required) {
3474 // Assemble the bootclasspath elements into the final path.
3475 Arguments::set_sysclasspath(scp_p->combined_path());
3476 }
3477
3478 // This must be done after all arguments have been processed.
3479 // java_compiler() true means set to "NONE" or empty.
3480 if (java_compiler() && !xdebug_mode()) {
3481 // For backwards compatibility, we switch to interpreted mode if
3482 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3483 // not specified.
3484 set_mode_flags(_int);
3485 }
3486
3487 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3488 // but like -Xint, leave compilation thresholds unaffected.
3489 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3490 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3491 set_mode_flags(_int);
3492 }
3493
3494 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3495 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3496 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3497 }
3498
3499 #ifndef COMPILER2
3500 // Don't degrade server performance for footprint
3501 if (FLAG_IS_DEFAULT(UseLargePages) &&
3502 MaxHeapSize < LargePageHeapSizeThreshold) {
3503 // No need for large granularity pages w/small heaps.
3504 // Note that large pages are enabled/disabled for both the
3505 // Java heap and the code cache.
3506 FLAG_SET_DEFAULT(UseLargePages, false);
3507 }
3508
3509 #else
3510 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3511 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3512 }
3513 #endif
3514
3515 #ifndef TIERED
3516 // Tiered compilation is undefined.
3517 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3518 #endif
3519
3520 // If we are running in a headless jre, force java.awt.headless property
3521 // to be true unless the property has already been set.
3522 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3523 if (os::is_headless_jre()) {
3524 const char* headless = Arguments::get_property("java.awt.headless");
3525 if (headless == NULL) {
3526 char envbuffer[128];
3527 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3528 if (!add_property("java.awt.headless=true")) {
3529 return JNI_ENOMEM;
3530 }
3531 } else {
3532 char buffer[256];
3533 strcpy(buffer, "java.awt.headless=");
3534 strcat(buffer, envbuffer);
3535 if (!add_property(buffer)) {
3536 return JNI_ENOMEM;
3537 }
3538 }
3539 }
3540 }
3541
3542 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3543 // CMS can only be used with ParNew
3544 FLAG_SET_ERGO(bool, UseParNewGC, true);
3545 }
3546
3547 if (!check_vm_args_consistency()) {
3548 return JNI_ERR;
3549 }
3550
3551 return JNI_OK;
3552 }
3553
3554 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3555 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3556 scp_assembly_required_p);
3557 }
3558
3559 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3560 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3561 scp_assembly_required_p);
3562 }
3563
3564 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3565 const int N_MAX_OPTIONS = 64;
3566 const int OPTION_BUFFER_SIZE = 1024;
3567 char buffer[OPTION_BUFFER_SIZE];
3568
3569 // The variable will be ignored if it exceeds the length of the buffer.
3570 // Don't check this variable if user has special privileges
3571 // (e.g. unix su command).
3572 if (os::getenv(name, buffer, sizeof(buffer)) &&
3573 !os::have_special_privileges()) {
3574 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3575 jio_fprintf(defaultStream::error_stream(),
3576 "Picked up %s: %s\n", name, buffer);
3577 char* rd = buffer; // pointer to the input string (rd)
3578 int i;
3579 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3580 while (isspace(*rd)) rd++; // skip whitespace
3581 if (*rd == 0) break; // we re done when the input string is read completely
3582
3583 // The output, option string, overwrites the input string.
3584 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3585 // input string (rd).
3586 char* wrt = rd;
3587
3588 options[i++].optionString = wrt; // Fill in option
3589 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3590 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3591 int quote = *rd; // matching quote to look for
3592 rd++; // don't copy open quote
3593 while (*rd != quote) { // include everything (even spaces) up until quote
3594 if (*rd == 0) { // string termination means unmatched string
3595 jio_fprintf(defaultStream::error_stream(),
3596 "Unmatched quote in %s\n", name);
3597 return JNI_ERR;
3598 }
3599 *wrt++ = *rd++; // copy to option string
3600 }
3601 rd++; // don't copy close quote
3602 } else {
3603 *wrt++ = *rd++; // copy to option string
3604 }
3605 }
3606 // Need to check if we're done before writing a NULL,
3607 // because the write could be to the byte that rd is pointing to.
3608 if (*rd++ == 0) {
3609 *wrt = 0;
3610 break;
3611 }
3612 *wrt = 0; // Zero terminate option
3613 }
3614 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3615 JavaVMInitArgs vm_args;
3616 vm_args.version = JNI_VERSION_1_2;
3617 vm_args.options = options;
3618 vm_args.nOptions = i;
3619 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3620
3621 if (PrintVMOptions) {
3622 const char* tail;
3623 for (int i = 0; i < vm_args.nOptions; i++) {
3624 const JavaVMOption *option = vm_args.options + i;
3625 if (match_option(option, "-XX:", &tail)) {
3626 logOption(tail);
3627 }
3628 }
3629 }
3630
3631 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3632 }
3633 return JNI_OK;
3634 }
3635
3636 void Arguments::set_shared_spaces_flags() {
3637 if (DumpSharedSpaces) {
3638 if (RequireSharedSpaces) {
3639 warning("cannot dump shared archive while using shared archive");
3640 }
3641 UseSharedSpaces = false;
3642 #ifdef _LP64
3643 if (!UseCompressedOops || !UseCompressedClassPointers) {
3644 vm_exit_during_initialization(
3645 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3646 }
3647 } else {
3648 if (!UseCompressedOops || !UseCompressedClassPointers) {
3649 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3650 }
3651 #endif
3652 }
3653 }
3654
3655 #if !INCLUDE_ALL_GCS
3656 static void force_serial_gc() {
3657 FLAG_SET_DEFAULT(UseSerialGC, true);
3658 UNSUPPORTED_GC_OPTION(UseG1GC);
3659 UNSUPPORTED_GC_OPTION(UseParallelGC);
3660 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3661 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3662 UNSUPPORTED_GC_OPTION(UseParNewGC);
3663 }
3664 #endif // INCLUDE_ALL_GCS
3665
3666 // Sharing support
3667 // Construct the path to the archive
3668 static char* get_shared_archive_path() {
3669 char *shared_archive_path;
3670 if (SharedArchiveFile == NULL) {
3671 char jvm_path[JVM_MAXPATHLEN];
3672 os::jvm_path(jvm_path, sizeof(jvm_path));
3673 char *end = strrchr(jvm_path, *os::file_separator());
3674 if (end != NULL) *end = '\0';
3675 size_t jvm_path_len = strlen(jvm_path);
3676 size_t file_sep_len = strlen(os::file_separator());
3677 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3678 file_sep_len + 20, mtInternal);
3679 if (shared_archive_path != NULL) {
3680 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3681 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3682 strncat(shared_archive_path, "classes.jsa", 11);
3683 }
3684 } else {
3685 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3686 if (shared_archive_path != NULL) {
3687 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3688 }
3689 }
3690 return shared_archive_path;
3691 }
3692
3693 #ifndef PRODUCT
3694 // Determine whether LogVMOutput should be implicitly turned on.
3695 static bool use_vm_log() {
3696 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3697 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3698 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3699 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3700 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3701 return true;
3702 }
3703
3704 #ifdef COMPILER1
3705 if (PrintC1Statistics) {
3706 return true;
3707 }
3708 #endif // COMPILER1
3709
3710 #ifdef COMPILER2
3711 if (PrintOptoAssembly || PrintOptoStatistics) {
3712 return true;
3713 }
3714 #endif // COMPILER2
3715
3716 return false;
3717 }
3718 #endif // PRODUCT
3719
3720 // Parse entry point called from JNI_CreateJavaVM
3721
3722 jint Arguments::parse(const JavaVMInitArgs* args) {
3723
3724 // Remaining part of option string
3725 const char* tail;
3726
3727 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3728 const char* hotspotrc = ".hotspotrc";
3729 bool settings_file_specified = false;
3730 bool needs_hotspotrc_warning = false;
3731
3732 const char* flags_file;
3733 int index;
3734 for (index = 0; index < args->nOptions; index++) {
3735 const JavaVMOption *option = args->options + index;
3736 if (ArgumentsExt::process_options(option)) {
3737 continue;
3738 }
3739 if (match_option(option, "-XX:Flags=", &tail)) {
3740 flags_file = tail;
3741 settings_file_specified = true;
3742 continue;
3743 }
3744 if (match_option(option, "-XX:+PrintVMOptions")) {
3745 PrintVMOptions = true;
3746 continue;
3747 }
3748 if (match_option(option, "-XX:-PrintVMOptions")) {
3749 PrintVMOptions = false;
3750 continue;
3751 }
3752 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3753 IgnoreUnrecognizedVMOptions = true;
3754 continue;
3755 }
3756 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3757 IgnoreUnrecognizedVMOptions = false;
3758 continue;
3759 }
3760 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3761 CommandLineFlags::printFlags(tty, false);
3762 vm_exit(0);
3763 }
3764 #if INCLUDE_NMT
3765 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3766 // The launcher did not setup nmt environment variable properly.
3767 if (!MemTracker::check_launcher_nmt_support(tail)) {
3768 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3769 }
3770
3771 // Verify if nmt option is valid.
3772 if (MemTracker::verify_nmt_option()) {
3773 // Late initialization, still in single-threaded mode.
3774 if (MemTracker::tracking_level() >= NMT_summary) {
3775 MemTracker::init();
3776 }
3777 } else {
3778 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3779 }
3780 continue;
3781 }
3782 #endif
3783
3784
3785 #ifndef PRODUCT
3786 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3787 CommandLineFlags::printFlags(tty, true);
3788 vm_exit(0);
3789 }
3790 #endif
3791 }
3792
3793 if (IgnoreUnrecognizedVMOptions) {
3794 // uncast const to modify the flag args->ignoreUnrecognized
3795 *(jboolean*)(&args->ignoreUnrecognized) = true;
3796 }
3797
3798 // Parse specified settings file
3799 if (settings_file_specified) {
3800 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3801 return JNI_EINVAL;
3802 }
3803 } else {
3804 #ifdef ASSERT
3805 // Parse default .hotspotrc settings file
3806 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3807 return JNI_EINVAL;
3808 }
3809 #else
3810 struct stat buf;
3811 if (os::stat(hotspotrc, &buf) == 0) {
3812 needs_hotspotrc_warning = true;
3813 }
3814 #endif
3815 }
3816
3817 if (PrintVMOptions) {
3818 for (index = 0; index < args->nOptions; index++) {
3819 const JavaVMOption *option = args->options + index;
3820 if (match_option(option, "-XX:", &tail)) {
3821 logOption(tail);
3822 }
3823 }
3824 }
3825
3826 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3827 jint result = parse_vm_init_args(args);
3828 if (result != JNI_OK) {
3829 return result;
3830 }
3831
3832 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3833 SharedArchivePath = get_shared_archive_path();
3834 if (SharedArchivePath == NULL) {
3835 return JNI_ENOMEM;
3836 }
3837
3838 // Set up VerifySharedSpaces
3839 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3840 VerifySharedSpaces = true;
3841 }
3842
3843 // Delay warning until here so that we've had a chance to process
3844 // the -XX:-PrintWarnings flag
3845 if (needs_hotspotrc_warning) {
3846 warning("%s file is present but has been ignored. "
3847 "Run with -XX:Flags=%s to load the file.",
3848 hotspotrc, hotspotrc);
3849 }
3850
3851 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3852 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3853 #endif
3854
3855 ArgumentsExt::report_unsupported_options();
3856
3857 #ifndef PRODUCT
3858 if (TraceBytecodesAt != 0) {
3859 TraceBytecodes = true;
3860 }
3861 if (CountCompiledCalls) {
3862 if (UseCounterDecay) {
3863 warning("UseCounterDecay disabled because CountCalls is set");
3864 UseCounterDecay = false;
3865 }
3866 }
3867 #endif // PRODUCT
3868
3869 if (ScavengeRootsInCode == 0) {
3870 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3871 warning("forcing ScavengeRootsInCode non-zero");
3872 }
3873 ScavengeRootsInCode = 1;
3874 }
3875
3876 if (PrintGCDetails) {
3877 // Turn on -verbose:gc options as well
3878 PrintGC = true;
3879 }
3880
3881 // Set object alignment values.
3882 set_object_alignment();
3883
3884 #if !INCLUDE_ALL_GCS
3885 force_serial_gc();
3886 #endif // INCLUDE_ALL_GCS
3887 #if !INCLUDE_CDS
3888 if (DumpSharedSpaces || RequireSharedSpaces) {
3889 jio_fprintf(defaultStream::error_stream(),
3890 "Shared spaces are not supported in this VM\n");
3891 return JNI_ERR;
3892 }
3893 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3894 warning("Shared spaces are not supported in this VM");
3895 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3896 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3897 }
3898 no_shared_spaces("CDS Disabled");
3899 #endif // INCLUDE_CDS
3900
3901 return JNI_OK;
3902 }
3903
3904 jint Arguments::apply_ergo() {
3905
3906 // Set flags based on ergonomics.
3907 set_ergonomics_flags();
3908
3909 set_shared_spaces_flags();
3910
3911 // Check the GC selections again.
3912 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3913 return JNI_EINVAL;
3914 }
3915
3916 if (TieredCompilation) {
3917 set_tiered_flags();
3918 } else {
3919 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3920 if (CompilationPolicyChoice >= 2) {
3921 vm_exit_during_initialization(
3922 "Incompatible compilation policy selected", NULL);
3923 }
3924 // Scale CompileThreshold
3925 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3926 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3927 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3928 }
3929 }
3930
3931 #ifdef COMPILER2
3932 #ifndef PRODUCT
3933 if (PrintIdealGraphLevel > 0) {
3934 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3935 }
3936 #endif
3937 #endif
3938
3939 // Set heap size based on available physical memory
3940 set_heap_size();
3941
3942 ArgumentsExt::set_gc_specific_flags();
3943
3944 // Initialize Metaspace flags and alignments
3945 Metaspace::ergo_initialize();
3946
3947 // Set bytecode rewriting flags
3948 set_bytecode_flags();
3949
3950 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3951 set_aggressive_opts_flags();
3952
3953 // Turn off biased locking for locking debug mode flags,
3954 // which are subtly different from each other but neither works with
3955 // biased locking
3956 if (UseHeavyMonitors
3957 #ifdef COMPILER1
3958 || !UseFastLocking
3959 #endif // COMPILER1
3960 ) {
3961 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3962 // flag set to true on command line; warn the user that they
3963 // can't enable biased locking here
3964 warning("Biased Locking is not supported with locking debug flags"
3965 "; ignoring UseBiasedLocking flag." );
3966 }
3967 UseBiasedLocking = false;
3968 }
3969
3970 #ifdef ZERO
3971 // Clear flags not supported on zero.
3972 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3973 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3974 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3975 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3976 #endif // CC_INTERP
3977
3978 #ifdef COMPILER2
3979 if (!EliminateLocks) {
3980 EliminateNestedLocks = false;
3981 }
3982 if (!Inline) {
3983 IncrementalInline = false;
3984 }
3985 #ifndef PRODUCT
3986 if (!IncrementalInline) {
3987 AlwaysIncrementalInline = false;
3988 }
3989 #endif
3990 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3991 // nothing to use the profiling, turn if off
3992 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3993 }
3994 #endif
3995
3996 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3997 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3998 DebugNonSafepoints = true;
3999 }
4000
4001 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4002 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4003 }
4004
4005 #ifndef PRODUCT
4006 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4007 if (use_vm_log()) {
4008 LogVMOutput = true;
4009 }
4010 }
4011 #endif // PRODUCT
4012
4013 if (PrintCommandLineFlags) {
4014 CommandLineFlags::printSetFlags(tty);
4015 }
4016
4017 // Apply CPU specific policy for the BiasedLocking
4018 if (UseBiasedLocking) {
4019 if (!VM_Version::use_biased_locking() &&
4020 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4021 UseBiasedLocking = false;
4022 }
4023 }
4024 #ifdef COMPILER2
4025 if (!UseBiasedLocking || EmitSync != 0) {
4026 UseOptoBiasInlining = false;
4027 }
4028 #endif
4029
4030 return JNI_OK;
4031 }
4032
4033 jint Arguments::adjust_after_os() {
4034 if (UseNUMA) {
4035 if (UseParallelGC || UseParallelOldGC) {
4036 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4037 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4038 }
4039 }
4040 // UseNUMAInterleaving is set to ON for all collectors and
4041 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4042 // such as the parallel collector for Linux and Solaris will
4043 // interleave old gen and survivor spaces on top of NUMA
4044 // allocation policy for the eden space.
4045 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4046 // all platforms and ParallelGC on Windows will interleave all
4047 // of the heap spaces across NUMA nodes.
4048 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4049 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4050 }
4051 }
4052 return JNI_OK;
4053 }
4054
4055 int Arguments::PropertyList_count(SystemProperty* pl) {
4056 int count = 0;
4057 while(pl != NULL) {
4058 count++;
4059 pl = pl->next();
4060 }
4061 return count;
4062 }
4063
4064 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4065 assert(key != NULL, "just checking");
4066 SystemProperty* prop;
4067 for (prop = pl; prop != NULL; prop = prop->next()) {
4068 if (strcmp(key, prop->key()) == 0) return prop->value();
4069 }
4070 return NULL;
4071 }
4072
4073 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4074 int count = 0;
4075 const char* ret_val = NULL;
4076
4077 while(pl != NULL) {
4078 if(count >= index) {
4079 ret_val = pl->key();
4080 break;
4081 }
4082 count++;
4083 pl = pl->next();
4084 }
4085
4086 return ret_val;
4087 }
4088
4089 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4090 int count = 0;
4091 char* ret_val = NULL;
4092
4093 while(pl != NULL) {
4094 if(count >= index) {
4095 ret_val = pl->value();
4096 break;
4097 }
4098 count++;
4099 pl = pl->next();
4100 }
4101
4102 return ret_val;
4103 }
4104
4105 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4106 SystemProperty* p = *plist;
4107 if (p == NULL) {
4108 *plist = new_p;
4109 } else {
4110 while (p->next() != NULL) {
4111 p = p->next();
4112 }
4113 p->set_next(new_p);
4114 }
4115 }
4116
4117 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4118 if (plist == NULL)
4119 return;
4120
4121 SystemProperty* new_p = new SystemProperty(k, v, true);
4122 PropertyList_add(plist, new_p);
4123 }
4124
4125 void Arguments::PropertyList_add(SystemProperty *element) {
4126 PropertyList_add(&_system_properties, element);
4127 }
4128
4129 // This add maintains unique property key in the list.
4130 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4131 if (plist == NULL)
4132 return;
4133
4134 // If property key exist then update with new value.
4135 SystemProperty* prop;
4136 for (prop = *plist; prop != NULL; prop = prop->next()) {
4137 if (strcmp(k, prop->key()) == 0) {
4138 if (append) {
4139 prop->append_value(v);
4140 } else {
4141 prop->set_value(v);
4142 }
4143 return;
4144 }
4145 }
4146
4147 PropertyList_add(plist, k, v);
4148 }
4149
4150 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4151 // Returns true if all of the source pointed by src has been copied over to
4152 // the destination buffer pointed by buf. Otherwise, returns false.
4153 // Notes:
4154 // 1. If the length (buflen) of the destination buffer excluding the
4155 // NULL terminator character is not long enough for holding the expanded
4156 // pid characters, it also returns false instead of returning the partially
4157 // expanded one.
4158 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4159 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4160 char* buf, size_t buflen) {
4161 const char* p = src;
4162 char* b = buf;
4163 const char* src_end = &src[srclen];
4164 char* buf_end = &buf[buflen - 1];
4165
4166 while (p < src_end && b < buf_end) {
4167 if (*p == '%') {
4168 switch (*(++p)) {
4169 case '%': // "%%" ==> "%"
4170 *b++ = *p++;
4171 break;
4172 case 'p': { // "%p" ==> current process id
4173 // buf_end points to the character before the last character so
4174 // that we could write '\0' to the end of the buffer.
4175 size_t buf_sz = buf_end - b + 1;
4176 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4177
4178 // if jio_snprintf fails or the buffer is not long enough to hold
4179 // the expanded pid, returns false.
4180 if (ret < 0 || ret >= (int)buf_sz) {
4181 return false;
4182 } else {
4183 b += ret;
4184 assert(*b == '\0', "fail in copy_expand_pid");
4185 if (p == src_end && b == buf_end + 1) {
4186 // reach the end of the buffer.
4187 return true;
4188 }
4189 }
4190 p++;
4191 break;
4192 }
4193 default :
4194 *b++ = '%';
4195 }
4196 } else {
4197 *b++ = *p++;
4198 }
4199 }
4200 *b = '\0';
4201 return (p == src_end); // return false if not all of the source was copied
4202 }
--- EOF ---