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