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