/java-1.7.0-openjdk/openjdk/hotspot/src/share/vm/runtime/arguments.cpp
C++ | 3380 lines | 3053 code | 158 blank | 169 comment | 338 complexity | 1ff331024371cf94ab0164bb2a74ac73 MD5 | raw file
Possible License(s): GPL-2.0, BSD-3-Clause-No-Nuclear-License-2014, LGPL-3.0, LGPL-2.0
- /*
- * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
- #include "precompiled.hpp"
- #include "classfile/javaAssertions.hpp"
- #include "compiler/compilerOracle.hpp"
- #include "memory/allocation.inline.hpp"
- #include "memory/cardTableRS.hpp"
- #include "memory/referenceProcessor.hpp"
- #include "memory/universe.inline.hpp"
- #include "oops/oop.inline.hpp"
- #include "prims/jvmtiExport.hpp"
- #include "runtime/arguments.hpp"
- #include "runtime/globals_extension.hpp"
- #include "runtime/java.hpp"
- #include "services/management.hpp"
- #include "utilities/defaultStream.hpp"
- #include "utilities/taskqueue.hpp"
- #ifdef TARGET_OS_FAMILY_linux
- # include "os_linux.inline.hpp"
- #endif
- #ifdef TARGET_OS_FAMILY_solaris
- # include "os_solaris.inline.hpp"
- #endif
- #ifdef TARGET_OS_FAMILY_windows
- # include "os_windows.inline.hpp"
- #endif
- #ifdef TARGET_OS_FAMILY_bsd
- # include "os_bsd.inline.hpp"
- #endif
- #ifndef SERIALGC
- #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
- #endif
- #define DEFAULT_VENDOR_URL_BUG "http://icedtea.classpath.org/bugzilla"
- #define DEFAULT_JAVA_LAUNCHER "generic"
- char** Arguments::_jvm_flags_array = NULL;
- int Arguments::_num_jvm_flags = 0;
- char** Arguments::_jvm_args_array = NULL;
- int Arguments::_num_jvm_args = 0;
- char* Arguments::_java_command = NULL;
- SystemProperty* Arguments::_system_properties = NULL;
- const char* Arguments::_gc_log_filename = NULL;
- bool Arguments::_has_profile = false;
- bool Arguments::_has_alloc_profile = false;
- uintx Arguments::_min_heap_size = 0;
- Arguments::Mode Arguments::_mode = _mixed;
- bool Arguments::_java_compiler = false;
- bool Arguments::_xdebug_mode = false;
- const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
- const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
- int Arguments::_sun_java_launcher_pid = -1;
- bool Arguments::_created_by_gamma_launcher = false;
- // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
- bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
- bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
- bool Arguments::_BackgroundCompilation = BackgroundCompilation;
- bool Arguments::_ClipInlining = ClipInlining;
- char* Arguments::SharedArchivePath = NULL;
- AgentLibraryList Arguments::_libraryList;
- AgentLibraryList Arguments::_agentList;
- abort_hook_t Arguments::_abort_hook = NULL;
- exit_hook_t Arguments::_exit_hook = NULL;
- vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
- SystemProperty *Arguments::_java_ext_dirs = NULL;
- SystemProperty *Arguments::_java_endorsed_dirs = NULL;
- SystemProperty *Arguments::_sun_boot_library_path = NULL;
- SystemProperty *Arguments::_java_library_path = NULL;
- SystemProperty *Arguments::_java_home = NULL;
- SystemProperty *Arguments::_java_class_path = NULL;
- SystemProperty *Arguments::_sun_boot_class_path = NULL;
- char* Arguments::_meta_index_path = NULL;
- char* Arguments::_meta_index_dir = NULL;
- // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
- static bool match_option(const JavaVMOption *option, const char* name,
- const char** tail) {
- int len = (int)strlen(name);
- if (strncmp(option->optionString, name, len) == 0) {
- *tail = option->optionString + len;
- return true;
- } else {
- return false;
- }
- }
- static void logOption(const char* opt) {
- if (PrintVMOptions) {
- jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
- }
- }
- // Process java launcher properties.
- void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
- // See if sun.java.launcher or sun.java.launcher.pid is defined.
- // Must do this before setting up other system properties,
- // as some of them may depend on launcher type.
- for (int index = 0; index < args->nOptions; index++) {
- const JavaVMOption* option = args->options + index;
- const char* tail;
- if (match_option(option, "-Dsun.java.launcher=", &tail)) {
- process_java_launcher_argument(tail, option->extraInfo);
- continue;
- }
- if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
- _sun_java_launcher_pid = atoi(tail);
- continue;
- }
- }
- }
- // Initialize system properties key and value.
- void Arguments::init_system_properties() {
- PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
- "Java Virtual Machine Specification", false));
- PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
- PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
- PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
- // following are JVMTI agent writeable properties.
- // Properties values are set to NULL and they are
- // os specific they are initialized in os::init_system_properties_values().
- _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
- _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
- _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
- _java_library_path = new SystemProperty("java.library.path", NULL, true);
- _java_home = new SystemProperty("java.home", NULL, true);
- _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
- _java_class_path = new SystemProperty("java.class.path", "", true);
- // Add to System Property list.
- PropertyList_add(&_system_properties, _java_ext_dirs);
- PropertyList_add(&_system_properties, _java_endorsed_dirs);
- PropertyList_add(&_system_properties, _sun_boot_library_path);
- PropertyList_add(&_system_properties, _java_library_path);
- PropertyList_add(&_system_properties, _java_home);
- PropertyList_add(&_system_properties, _java_class_path);
- PropertyList_add(&_system_properties, _sun_boot_class_path);
- // Set OS specific system properties values
- os::init_system_properties_values();
- }
- // Update/Initialize System properties after JDK version number is known
- void Arguments::init_version_specific_system_properties() {
- enum { bufsz = 16 };
- char buffer[bufsz];
- const char* spec_vendor = "Sun Microsystems Inc.";
- uint32_t spec_version = 0;
- if (JDK_Version::is_gte_jdk17x_version()) {
- spec_vendor = "Oracle Corporation";
- spec_version = JDK_Version::current().major_version();
- }
- jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
- PropertyList_add(&_system_properties,
- new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
- PropertyList_add(&_system_properties,
- new SystemProperty("java.vm.specification.version", buffer, false));
- PropertyList_add(&_system_properties,
- new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
- }
- /**
- * Provide a slightly more user-friendly way of eliminating -XX flags.
- * When a flag is eliminated, it can be added to this list in order to
- * continue accepting this flag on the command-line, while issuing a warning
- * and ignoring the value. Once the JDK version reaches the 'accept_until'
- * limit, we flatly refuse to admit the existence of the flag. This allows
- * a flag to die correctly over JDK releases using HSX.
- */
- typedef struct {
- const char* name;
- JDK_Version obsoleted_in; // when the flag went away
- JDK_Version accept_until; // which version to start denying the existence
- } ObsoleteFlag;
- static ObsoleteFlag obsolete_jvm_flags[] = {
- { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
- { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
- { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
- { "DefaultInitialRAMFraction",
- JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
- { "UseDepthFirstScavengeOrder",
- JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
- { "HandlePromotionFailure",
- JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
- { "MaxLiveObjectEvacuationRatio",
- JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
- { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
- { "UseParallelOldGCCompacting",
- JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
- { "UseParallelDensePrefixUpdate",
- JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
- { "UseParallelOldGCDensePrefix",
- JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
- { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
- { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
- #ifdef PRODUCT
- { "DesiredMethodLimit",
- JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
- #endif // PRODUCT
- { NULL, JDK_Version(0), JDK_Version(0) }
- };
- // Returns true if the flag is obsolete and fits into the range specified
- // for being ignored. In the case that the flag is ignored, the 'version'
- // value is filled in with the version number when the flag became
- // obsolete so that that value can be displayed to the user.
- bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
- int i = 0;
- assert(version != NULL, "Must provide a version buffer");
- while (obsolete_jvm_flags[i].name != NULL) {
- const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
- // <flag>=xxx form
- // [-|+]<flag> form
- if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
- ((s[0] == '+' || s[0] == '-') &&
- (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
- if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
- *version = flag_status.obsoleted_in;
- return true;
- }
- }
- i++;
- }
- return false;
- }
- // Constructs the system class path (aka boot class path) from the following
- // components, in order:
- //
- // prefix // from -Xbootclasspath/p:...
- // endorsed // the expansion of -Djava.endorsed.dirs=...
- // base // from os::get_system_properties() or -Xbootclasspath=
- // suffix // from -Xbootclasspath/a:...
- //
- // java.endorsed.dirs is a list of directories; any jar or zip files in the
- // directories are added to the sysclasspath just before the base.
- //
- // This could be AllStatic, but it isn't needed after argument processing is
- // complete.
- class SysClassPath: public StackObj {
- public:
- SysClassPath(const char* base);
- ~SysClassPath();
- inline void set_base(const char* base);
- inline void add_prefix(const char* prefix);
- inline void add_suffix_to_prefix(const char* suffix);
- inline void add_suffix(const char* suffix);
- inline void reset_path(const char* base);
- // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
- // property. Must be called after all command-line arguments have been
- // processed (in particular, -Djava.endorsed.dirs=...) and before calling
- // combined_path().
- void expand_endorsed();
- inline const char* get_base() const { return _items[_scp_base]; }
- inline const char* get_prefix() const { return _items[_scp_prefix]; }
- inline const char* get_suffix() const { return _items[_scp_suffix]; }
- inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
- // Combine all the components into a single c-heap-allocated string; caller
- // must free the string if/when no longer needed.
- char* combined_path();
- private:
- // Utility routines.
- static char* add_to_path(const char* path, const char* str, bool prepend);
- static char* add_jars_to_path(char* path, const char* directory);
- inline void reset_item_at(int index);
- // Array indices for the items that make up the sysclasspath. All except the
- // base are allocated in the C heap and freed by this class.
- enum {
- _scp_prefix, // from -Xbootclasspath/p:...
- _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
- _scp_base, // the default sysclasspath
- _scp_suffix, // from -Xbootclasspath/a:...
- _scp_nitems // the number of items, must be last.
- };
- const char* _items[_scp_nitems];
- DEBUG_ONLY(bool _expansion_done;)
- };
- SysClassPath::SysClassPath(const char* base) {
- memset(_items, 0, sizeof(_items));
- _items[_scp_base] = base;
- DEBUG_ONLY(_expansion_done = false;)
- }
- SysClassPath::~SysClassPath() {
- // Free everything except the base.
- for (int i = 0; i < _scp_nitems; ++i) {
- if (i != _scp_base) reset_item_at(i);
- }
- DEBUG_ONLY(_expansion_done = false;)
- }
- inline void SysClassPath::set_base(const char* base) {
- _items[_scp_base] = base;
- }
- inline void SysClassPath::add_prefix(const char* prefix) {
- _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
- }
- inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
- _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
- }
- inline void SysClassPath::add_suffix(const char* suffix) {
- _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
- }
- inline void SysClassPath::reset_item_at(int index) {
- assert(index < _scp_nitems && index != _scp_base, "just checking");
- if (_items[index] != NULL) {
- FREE_C_HEAP_ARRAY(char, _items[index]);
- _items[index] = NULL;
- }
- }
- inline void SysClassPath::reset_path(const char* base) {
- // Clear the prefix and suffix.
- reset_item_at(_scp_prefix);
- reset_item_at(_scp_suffix);
- set_base(base);
- }
- //------------------------------------------------------------------------------
- void SysClassPath::expand_endorsed() {
- assert(_items[_scp_endorsed] == NULL, "can only be called once.");
- const char* path = Arguments::get_property("java.endorsed.dirs");
- if (path == NULL) {
- path = Arguments::get_endorsed_dir();
- assert(path != NULL, "no default for java.endorsed.dirs");
- }
- char* expanded_path = NULL;
- const char separator = *os::path_separator();
- const char* const end = path + strlen(path);
- while (path < end) {
- const char* tmp_end = strchr(path, separator);
- if (tmp_end == NULL) {
- expanded_path = add_jars_to_path(expanded_path, path);
- path = end;
- } else {
- char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
- memcpy(dirpath, path, tmp_end - path);
- dirpath[tmp_end - path] = '\0';
- expanded_path = add_jars_to_path(expanded_path, dirpath);
- FREE_C_HEAP_ARRAY(char, dirpath);
- path = tmp_end + 1;
- }
- }
- _items[_scp_endorsed] = expanded_path;
- DEBUG_ONLY(_expansion_done = true;)
- }
- // Combine the bootclasspath elements, some of which may be null, into a single
- // c-heap-allocated string.
- char* SysClassPath::combined_path() {
- assert(_items[_scp_base] != NULL, "empty default sysclasspath");
- assert(_expansion_done, "must call expand_endorsed() first.");
- size_t lengths[_scp_nitems];
- size_t total_len = 0;
- const char separator = *os::path_separator();
- // Get the lengths.
- int i;
- for (i = 0; i < _scp_nitems; ++i) {
- if (_items[i] != NULL) {
- lengths[i] = strlen(_items[i]);
- // Include space for the separator char (or a NULL for the last item).
- total_len += lengths[i] + 1;
- }
- }
- assert(total_len > 0, "empty sysclasspath not allowed");
- // Copy the _items to a single string.
- char* cp = NEW_C_HEAP_ARRAY(char, total_len);
- char* cp_tmp = cp;
- for (i = 0; i < _scp_nitems; ++i) {
- if (_items[i] != NULL) {
- memcpy(cp_tmp, _items[i], lengths[i]);
- cp_tmp += lengths[i];
- *cp_tmp++ = separator;
- }
- }
- *--cp_tmp = '\0'; // Replace the extra separator.
- return cp;
- }
- // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
- char*
- SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
- char *cp;
- assert(str != NULL, "just checking");
- if (path == NULL) {
- size_t len = strlen(str) + 1;
- cp = NEW_C_HEAP_ARRAY(char, len);
- memcpy(cp, str, len); // copy the trailing null
- } else {
- const char separator = *os::path_separator();
- size_t old_len = strlen(path);
- size_t str_len = strlen(str);
- size_t len = old_len + str_len + 2;
- if (prepend) {
- cp = NEW_C_HEAP_ARRAY(char, len);
- char* cp_tmp = cp;
- memcpy(cp_tmp, str, str_len);
- cp_tmp += str_len;
- *cp_tmp = separator;
- memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
- FREE_C_HEAP_ARRAY(char, path);
- } else {
- cp = REALLOC_C_HEAP_ARRAY(char, path, len);
- char* cp_tmp = cp + old_len;
- *cp_tmp = separator;
- memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
- }
- }
- return cp;
- }
- // Scan the directory and append any jar or zip files found to path.
- // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
- char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
- DIR* dir = os::opendir(directory);
- if (dir == NULL) return path;
- char dir_sep[2] = { '\0', '\0' };
- size_t directory_len = strlen(directory);
- const char fileSep = *os::file_separator();
- if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
- /* Scan the directory for jars/zips, appending them to path. */
- struct dirent *entry;
- char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
- while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
- const char* name = entry->d_name;
- const char* ext = name + strlen(name) - 4;
- bool isJarOrZip = ext > name &&
- (os::file_name_strcmp(ext, ".jar") == 0 ||
- os::file_name_strcmp(ext, ".zip") == 0);
- if (isJarOrZip) {
- char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
- sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
- path = add_to_path(path, jarpath, false);
- FREE_C_HEAP_ARRAY(char, jarpath);
- }
- }
- FREE_C_HEAP_ARRAY(char, dbuf);
- os::closedir(dir);
- return path;
- }
- // Parses a memory size specification string.
- static bool atomull(const char *s, julong* result) {
- julong n = 0;
- int args_read = sscanf(s, os::julong_format_specifier(), &n);
- if (args_read != 1) {
- return false;
- }
- while (*s != '\0' && isdigit(*s)) {
- s++;
- }
- // 4705540: illegal if more characters are found after the first non-digit
- if (strlen(s) > 1) {
- return false;
- }
- switch (*s) {
- case 'T': case 't':
- *result = n * G * K;
- // Check for overflow.
- if (*result/((julong)G * K) != n) return false;
- return true;
- case 'G': case 'g':
- *result = n * G;
- if (*result/G != n) return false;
- return true;
- case 'M': case 'm':
- *result = n * M;
- if (*result/M != n) return false;
- return true;
- case 'K': case 'k':
- *result = n * K;
- if (*result/K != n) return false;
- return true;
- case '\0':
- *result = n;
- return true;
- default:
- return false;
- }
- }
- Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
- if (size < min_size) return arg_too_small;
- // Check that size will fit in a size_t (only relevant on 32-bit)
- if (size > max_uintx) return arg_too_big;
- return arg_in_range;
- }
- // Describe an argument out of range error
- void Arguments::describe_range_error(ArgsRange errcode) {
- switch(errcode) {
- case arg_too_big:
- jio_fprintf(defaultStream::error_stream(),
- "The specified size exceeds the maximum "
- "representable size.\n");
- break;
- case arg_too_small:
- case arg_unreadable:
- case arg_in_range:
- // do nothing for now
- break;
- default:
- ShouldNotReachHere();
- }
- }
- static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
- return CommandLineFlags::boolAtPut(name, &value, origin);
- }
- static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
- double v;
- if (sscanf(value, "%lf", &v) != 1) {
- return false;
- }
- if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
- return true;
- }
- return false;
- }
- static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
- julong v;
- intx intx_v;
- bool is_neg = false;
- // Check the sign first since atomull() parses only unsigned values.
- if (*value == '-') {
- if (!CommandLineFlags::intxAt(name, &intx_v)) {
- return false;
- }
- value++;
- is_neg = true;
- }
- if (!atomull(value, &v)) {
- return false;
- }
- intx_v = (intx) v;
- if (is_neg) {
- intx_v = -intx_v;
- }
- if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
- return true;
- }
- uintx uintx_v = (uintx) v;
- if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
- return true;
- }
- uint64_t uint64_t_v = (uint64_t) v;
- if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
- return true;
- }
- return false;
- }
- static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
- if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
- // Contract: CommandLineFlags always returns a pointer that needs freeing.
- FREE_C_HEAP_ARRAY(char, value);
- return true;
- }
- static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
- const char* old_value = "";
- if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
- size_t old_len = old_value != NULL ? strlen(old_value) : 0;
- size_t new_len = strlen(new_value);
- const char* value;
- char* free_this_too = NULL;
- if (old_len == 0) {
- value = new_value;
- } else if (new_len == 0) {
- value = old_value;
- } else {
- char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
- // each new setting adds another LINE to the switch:
- sprintf(buf, "%s\n%s", old_value, new_value);
- value = buf;
- free_this_too = buf;
- }
- (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
- // CommandLineFlags always returns a pointer that needs freeing.
- FREE_C_HEAP_ARRAY(char, value);
- if (free_this_too != NULL) {
- // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
- FREE_C_HEAP_ARRAY(char, free_this_too);
- }
- return true;
- }
- bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
- // range of acceptable characters spelled out for portability reasons
- #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
- #define BUFLEN 255
- char name[BUFLEN+1];
- char dummy;
- if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
- return set_bool_flag(name, false, origin);
- }
- if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
- return set_bool_flag(name, true, origin);
- }
- char punct;
- if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
- const char* value = strchr(arg, '=') + 1;
- Flag* flag = Flag::find_flag(name, strlen(name));
- if (flag != NULL && flag->is_ccstr()) {
- if (flag->ccstr_accumulates()) {
- return append_to_string_flag(name, value, origin);
- } else {
- if (value[0] == '\0') {
- value = NULL;
- }
- return set_string_flag(name, value, origin);
- }
- }
- }
- if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
- const char* value = strchr(arg, '=') + 1;
- // -XX:Foo:=xxx will reset the string flag to the given value.
- if (value[0] == '\0') {
- value = NULL;
- }
- return set_string_flag(name, value, origin);
- }
- #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
- #define SIGNED_NUMBER_RANGE "[-0123456789]"
- #define NUMBER_RANGE "[0123456789]"
- char value[BUFLEN + 1];
- char value2[BUFLEN + 1];
- if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
- // Looks like a floating-point number -- try again with more lenient format string
- if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
- return set_fp_numeric_flag(name, value, origin);
- }
- }
- #define VALUE_RANGE "[-kmgtKMGT0123456789]"
- if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
- return set_numeric_flag(name, value, origin);
- }
- return false;
- }
- void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
- assert(bldarray != NULL, "illegal argument");
- if (arg == NULL) {
- return;
- }
- int index = *count;
- // expand the array and add arg to the last element
- (*count)++;
- if (*bldarray == NULL) {
- *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
- } else {
- *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
- }
- (*bldarray)[index] = strdup(arg);
- }
- void Arguments::build_jvm_args(const char* arg) {
- add_string(&_jvm_args_array, &_num_jvm_args, arg);
- }
- void Arguments::build_jvm_flags(const char* arg) {
- add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
- }
- // utility function to return a string that concatenates all
- // strings in a given char** array
- const char* Arguments::build_resource_string(char** args, int count) {
- if (args == NULL || count == 0) {
- return NULL;
- }
- size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
- for (int i = 1; i < count; i++) {
- length += strlen(args[i]) + 1; // add 1 for a space
- }
- char* s = NEW_RESOURCE_ARRAY(char, length);
- strcpy(s, args[0]);
- for (int j = 1; j < count; j++) {
- strcat(s, " ");
- strcat(s, args[j]);
- }
- return (const char*) s;
- }
- void Arguments::print_on(outputStream* st) {
- st->print_cr("VM Arguments:");
- if (num_jvm_flags() > 0) {
- st->print("jvm_flags: "); print_jvm_flags_on(st);
- }
- if (num_jvm_args() > 0) {
- st->print("jvm_args: "); print_jvm_args_on(st);
- }
- st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
- st->print_cr("Launcher Type: %s", _sun_java_launcher);
- }
- void Arguments::print_jvm_flags_on(outputStream* st) {
- if (_num_jvm_flags > 0) {
- for (int i=0; i < _num_jvm_flags; i++) {
- st->print("%s ", _jvm_flags_array[i]);
- }
- st->print_cr("");
- }
- }
- void Arguments::print_jvm_args_on(outputStream* st) {
- if (_num_jvm_args > 0) {
- for (int i=0; i < _num_jvm_args; i++) {
- st->print("%s ", _jvm_args_array[i]);
- }
- st->print_cr("");
- }
- }
- bool Arguments::process_argument(const char* arg,
- jboolean ignore_unrecognized, FlagValueOrigin origin) {
- JDK_Version since = JDK_Version();
- if (parse_argument(arg, origin) || ignore_unrecognized) {
- return true;
- }
- const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
- if (is_newly_obsolete(arg, &since)) {
- char version[256];
- since.to_string(version, sizeof(version));
- warning("ignoring option %s; support was removed in %s", argname, version);
- return true;
- }
- // For locked flags, report a custom error message if available.
- // Otherwise, report the standard unrecognized VM option.
- Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
- if (locked_flag != NULL) {
- char locked_message_buf[BUFLEN];
- locked_flag->get_locked_message(locked_message_buf, BUFLEN);
- if (strlen(locked_message_buf) == 0) {
- jio_fprintf(defaultStream::error_stream(),
- "Unrecognized VM option '%s'\n", argname);
- } else {
- jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
- }
- }
- // allow for commandline "commenting out" options like -XX:#+Verbose
- return arg[0] == '#';
- }
- bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
- FILE* stream = fopen(file_name, "rb");
- if (stream == NULL) {
- if (should_exist) {
- jio_fprintf(defaultStream::error_stream(),
- "Could not open settings file %s\n", file_name);
- return false;
- } else {
- return true;
- }
- }
- char token[1024];
- int pos = 0;
- bool in_white_space = true;
- bool in_comment = false;
- bool in_quote = false;
- char quote_c = 0;
- bool result = true;
- int c = getc(stream);
- while(c != EOF) {
- if (in_white_space) {
- if (in_comment) {
- if (c == '\n') in_comment = false;
- } else {
- if (c == '#') in_comment = true;
- else if (!isspace(c)) {
- in_white_space = false;
- token[pos++] = c;
- }
- }
- } else {
- if (c == '\n' || (!in_quote && isspace(c))) {
- // token ends at newline, or at unquoted whitespace
- // this allows a way to include spaces in string-valued options
- token[pos] = '\0';
- logOption(token);
- result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
- build_jvm_flags(token);
- pos = 0;
- in_white_space = true;
- in_quote = false;
- } else if (!in_quote && (c == '\'' || c == '"')) {
- in_quote = true;
- quote_c = c;
- } else if (in_quote && (c == quote_c)) {
- in_quote = false;
- } else {
- token[pos++] = c;
- }
- }
- c = getc(stream);
- }
- if (pos > 0) {
- token[pos] = '\0';
- result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
- build_jvm_flags(token);
- }
- fclose(stream);
- return result;
- }
- //=============================================================================================================
- // Parsing of properties (-D)
- const char* Arguments::get_property(const char* key) {
- return PropertyList_get_value(system_properties(), key);
- }
- bool Arguments::add_property(const char* prop) {
- const char* eq = strchr(prop, '=');
- char* key;
- // ns must be static--its address may be stored in a SystemProperty object.
- const static char ns[1] = {0};
- char* value = (char *)ns;
- size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
- key = AllocateHeap(key_len + 1, "add_property");
- strncpy(key, prop, key_len);
- key[key_len] = '\0';
- if (eq != NULL) {
- size_t value_len = strlen(prop) - key_len - 1;
- value = AllocateHeap(value_len + 1, "add_property");
- strncpy(value, &prop[key_len + 1], value_len + 1);
- }
- if (strcmp(key, "java.compiler") == 0) {
- process_java_compiler_argument(value);
- FreeHeap(key);
- if (eq != NULL) {
- FreeHeap(value);
- }
- return true;
- } else if (strcmp(key, "sun.java.command") == 0) {
- _java_command = value;
- // Record value in Arguments, but let it get passed to Java.
- } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
- // launcher.pid property is private and is processed
- // in process_sun_java_launcher_properties();
- // the sun.java.launcher property is passed on to the java application
- FreeHeap(key);
- if (eq != NULL) {
- FreeHeap(value);
- }
- return true;
- } else if (strcmp(key, "java.vendor.url.bug") == 0) {
- // save it in _java_vendor_url_bug, so JVM fatal error handler can access
- // its value without going through the property list or making a Java call.
- _java_vendor_url_bug = value;
- } else if (strcmp(key, "sun.boot.library.path") == 0) {
- PropertyList_unique_add(&_system_properties, key, value, true);
- return true;
- }
- // Create new property and add at the end of the list
- PropertyList_unique_add(&_system_properties, key, value);
- return true;
- }
- //===========================================================================================================
- // Setting int/mixed/comp mode flags
- void Arguments::set_mode_flags(Mode mode) {
- // Set up default values for all flags.
- // If you add a flag to any of the branches below,
- // add a default value for it here.
- set_java_compiler(false);
- _mode = mode;
- // Ensure Agent_OnLoad has the correct initial values.
- // This may not be the final mode; mode may change later in onload phase.
- PropertyList_unique_add(&_system_properties, "java.vm.info",
- (char*)VM_Version::vm_info_string(), false);
- UseInterpreter = true;
- UseCompiler = true;
- UseLoopCounter = true;
- #ifndef ZERO
- // Turn these off for mixed and comp. Leave them on for Zero.
- if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
- UseFastAccessorMethods = (mode == _int);
- }
- if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
- UseFastEmptyMethods = (mode == _int);
- }
- #endif
- // Default values may be platform/compiler dependent -
- // use the saved values
- ClipInlining = Arguments::_ClipInlining;
- AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
- UseOnStackReplacement = Arguments::_UseOnStackReplacement;
- BackgroundCompilation = Arguments::_BackgroundCompilation;
- // Change from defaults based on mode
- switch (mode) {
- default:
- ShouldNotReachHere();
- break;
- case _int:
- UseCompiler = false;
- UseLoopCounter = false;
- AlwaysCompileLoopMethods = false;
- UseOnStackReplacement = false;
- break;
- case _mixed:
- // same as default
- break;
- case _comp:
- UseInterpreter = false;
- BackgroundCompilation = false;
- ClipInlining = false;
- // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
- // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
- // compile a level 4 (C2) and then continue executing it.
- if (TieredCompilation) {
- Tier3InvokeNotifyFreqLog = 0;
- Tier4InvocationThreshold = 0;
- }
- break;
- }
- }
- // Conflict: required to use shared spaces (-Xshare:on), but
- // incompatible command line options were chosen.
- static void no_shared_spaces() {
- if (RequireSharedSpaces) {
- jio_fprintf(defaultStream::error_stream(),
- "Class data sharing is inconsistent with other specified options.\n");
- vm_exit_during_initialization("Unable to use shared archive.", NULL);
- } else {
- FLAG_SET_DEFAULT(UseSharedSpaces, false);
- }
- }
- void Arguments::set_tiered_flags() {
- // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
- if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
- FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
- }
- if (CompilationPolicyChoice < 2) {
- vm_exit_during_initialization(
- "Incompatible compilation policy selected", NULL);
- }
- // Increase the code cache size - tiered compiles a lot more.
- if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
- FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
- }
- }
- #ifndef KERNEL
- static void disable_adaptive_size_policy(const char* collector_name) {
- if (UseAdaptiveSizePolicy) {
- if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
- warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
- collector_name);
- }
- FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
- }
- }
- // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
- // if it's not explictly set or unset. If the user has chosen
- // UseParNewGC and not explicitly set ParallelGCThreads we
- // set it, unless this is a single cpu machine.
- void Arguments::set_parnew_gc_flags() {
- assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
- "control point invariant");
- assert(UseParNewGC, "Error");
- // Turn off AdaptiveSizePolicy for parnew until it is complete.
- disable_adaptive_size_policy("UseParNewGC");
- if (ParallelGCThreads == 0) {
- FLAG_SET_DEFAULT(ParallelGCThreads,
- Abstract_VM_Version::parallel_worker_threads());
- if (ParallelGCThreads == 1) {
- FLAG_SET_DEFAULT(UseParNewGC, false);
- FLAG_SET_DEFAULT(ParallelGCThreads, 0);
- }
- }
- if (UseParNewGC) {
- // CDS doesn't work with ParNew yet
- no_shared_spaces();
- // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
- // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
- // we set them to 1024 and 1024.
- // See CR 6362902.
- if (FLAG_IS_DEFAULT(YoungPLABSize)) {
- FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
- }
- if (FLAG_IS_DEFAULT(OldPLABSize)) {
- FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
- }
- // AlwaysTenure flag should make ParNew promote all at first collection.
- // See CR 6362902.
- if (AlwaysTenure) {
- FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
- }
- // When using compressed oops, we use local overflow stacks,
- // rather than using a global overflow list chained through
- // the klass word of the object's pre-image.
- if (UseCompressedOops && !ParGCUseLocalOverflow) {
- if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
- warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
- }
- FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
- }
- assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
- }
- }
- // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
- // sparc/solaris for certain applications, but would gain from
- // further optimization and tuning efforts, and would almost
- // certainly gain from analysis of platform and environment.
- void Arguments::set_cms_and_parnew_gc_flags() {
- assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
- assert(UseConcMarkSweepGC, "CMS is expected to be on here");
- // If we are using CMS, we prefer to UseParNewGC,
- // unless explicitly forbidden.
- if (FLAG_IS_DEFAULT(UseParNewGC)) {
- FLAG_SET_ERGO(bool, UseParNewGC, true);
- }
- // Turn off AdaptiveSizePolicy for CMS until it is complete.
- disable_adaptive_size_policy("UseConcMarkSweepGC");
- // In either case, adjust ParallelGCThreads and/or UseParNewGC
- // as needed.
- if (UseParNewGC) {
- set_parnew_gc_flags();
- }
- // MaxHeapSize is aligned down in collectorPolicy
- size_t max_heap = align_size_down(MaxHeapSize,
- CardTableRS::ct_max_alignment_constraint());
- // Now make adjustments for CMS
- intx tenuring_default = (intx)6;
- size_t young_gen_per_worker = CMSYoungGenPerWorker;
- // Preferred young gen size for "short" pauses:
- // upper bound depends on # of threads and NewRatio.
- const uintx parallel_gc_threads =
- (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
- const size_t preferred_max_new_size_unaligned =
- MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
- size_t preferred_max_new_size =
- align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
- // Unless explicitly requested otherwise, size young gen
- // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
- // If either MaxNewSize or NewRatio is set on the command line,
- // assume the user is trying to set the size of the young gen.
- if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
- // Set MaxNewSize to our calculated preferred_max_new_size unless
- // NewSize was set on the command line and it is larger than
- // preferred_max_new_size.
- if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
- FLAG_SET_ERGO(uintx, MaxNewSize, MAX2((size_t) NewSize, preferred_max_new_size));
- } else {
- FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
- }
- if (PrintGCDetails && Verbose) {
- // Too early to use gclog_or_tty
- tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
- }
- // Code along this path potentially sets NewSize and OldSize
- assert(max_heap >= InitialHeapSize, "Error");
- assert(max_heap >= NewSize, "Error");
- if (PrintGCDetails && Verbose) {
- // Too early to use gclog_or_tty
- tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
- " initial_heap_size: " SIZE_FORMAT
- " max_heap: " SIZE_FORMAT,
- min_heap_size(), InitialHeapSize, max_heap);
- }
- size_t min_new = preferred_max_new_size;
- if (FLAG_IS_CMDLINE(NewSize)) {
- min_new = NewSize;
- }
- if (max_heap > min_new && min_heap_size() > min_new) {
- // Unless explicitly requested otherwise, make young gen
- // at least min_new, and at most preferred_max_new_size.
- if (FLAG_IS_DEFAULT(NewSize)) {
- FLAG_SET_ERGO(uintx, NewSize, MAX2((size_t) NewSize, min_new));
- FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, (size_t) NewSize));
- if (PrintGCDetails && Verbose) {
- // Too early to use gclog_or_tty
- tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
- }
- }
- // Unless explicitly requested otherwise, size old gen
- // so it's NewRatio x of NewSize.
- if (FLAG_IS_DEFAULT(OldSize)) {
- if (max_heap > NewSize) {
- FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
- if (PrintGCDetails && Verbose) {
- // Too early to use gclog_or_tty
- tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
- }
- }
- }
- }
- }
- // Unless explicitly requested otherwise, definitely
- // promote all objects surviving "tenuring_default" scavenges.
- if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
- FLAG_IS_DEFAULT(SurvivorRatio)) {
- FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
- }
- // If we decided above (or user explicitly requested)
- // `promote all' (via MaxTenuringThreshold := 0),
- // prefer minuscule survivor spaces so as not to waste
- // space for (non-existent) survivors
- if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
- FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
- }
- // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
- // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
- // This is done in order to make ParNew+CMS configuration to work
- // with YoungPLABSize and OldPLABSize options.
- // See CR 6362902.
- if (!FLAG_IS_DEFAULT(OldPLABSize)) {
- if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
- // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
- // is. In this situtation let CMSParPromoteBlocksToClaim follow
- // the value (either from the command line or ergonomics) of
- // OldPLABSize. Following OldPLABSize is an ergonomics decision.
- FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
- } else {
- // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
- // CMSParPromoteBlocksToClaim is a collector-specific flag, so
- // we'll let it to take precedence.
- jio_fprintf(defaultStream::error_stream(),
- "Both OldPLABSize and CMSParPromoteBlocksToClaim"
- " options are specified for the CMS collector."
- " CMSParPromoteBlocksToClaim will take precedence.\n");
- }
- }
- if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
- // OldPLAB sizing manually turned off: Use a larger default setting,
- // unless it was manually specified. This is because a too-low value
- // will slow down scavenges.
- if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
- FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
- }
- }
- // Overwrite OldPLABSize which is the variable we will internally use everywhere.
- FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
- // If either of the static initialization defaults have changed, note this
- // modification.
- if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
- CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
- }
- if (PrintGCDetails && Verbose) {
- tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
- MarkStackSize / K, MarkStackSizeMax / K);
- tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
- }
- }
- #endif // KERNEL
- void set_object_alignment() {
- // Object alignment.
- assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
- MinObjAlignmentInBytes = ObjectAlignmentInBytes;
- assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
- MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
- assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
- MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
- LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
- LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
- // Oop encoding heap max
- OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
- #ifndef KERNEL
- // Set CMS global values
- CompactibleFreeListSpace::set_cms_values();
- #endif // KERNEL
- }
- bool verify_object_alignment() {
- // Object alignment.
- if (!is_power_of_2(ObjectAlignmentInBytes)) {
- jio_fprintf(defaultStream::error_stream(),
- "error: ObjectAlignmentInBytes=%d must be power of 2\n",
- (int)ObjectAlignmentInBytes);
- return false;
- }
- if ((int)ObjectAlignmentInBytes < BytesPerLong) {
- jio_fprintf(defaultStream::error_stream(),
- "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
- (int)ObjectAlignmentInBytes, BytesPerLong);
- return false;
- }
- // It does not make sense to have big object alignment
- // since a space lost due to alignment will be greater
- // then a saved space from compressed oops.
- if ((int)ObjectAlignmentInBytes > 256) {
- jio_fprintf(defaultStream::error_stream(),
- "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
- (int)ObjectAlignmentInBytes);
- return false;
- }
- // In case page size is very small.
- if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
- jio_fprintf(defaultStream::error_stream(),
- "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
- (int)ObjectAlignmentInBytes, os::vm_page_size());
- return false;
- }
- return true;
- }
- inline uintx max_heap_for_compressed_oops() {
- // Avoid sign flip.
- if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
- return 0;
- }
- LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
- NOT_LP64(ShouldNotReachHere(); return 0);
- }
- bool Arguments::should_auto_select_low_pause_collector() {
- if (UseAutoGCSelectPolicy &&
- !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
- (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
- if (PrintGCDetails) {
- // Cannot use gclog_or_tty yet.
- tty->print_cr("Automatic selection of the low pause collector"
- " based on pause goal of %d (ms)", MaxGCPauseMillis);
- }
- return true;
- }
- return false;
- }
- void Arguments::set_ergonomics_flags() {
- // Parallel GC is not compatible with sharing. If one specifies
- // that they want sharing explicitly, do not set ergonomics flags.
- if (DumpSharedSpaces || RequireSharedSpaces) {
- return;
- }
- if (os::is_server_class_machine()) {
- // If no other collector is requested explicitly,
- // let the VM select the collector based on
- // machine class and automatic selection policy.
- if (!UseSerialGC &&
- !UseConcMarkSweepGC &&
- !UseG1GC &&
- !UseParNewGC &&
- !DumpSharedSpaces &&
- FLAG_IS_DEFAULT(UseParallelGC)) {
- if (should_auto_select_low_pause_collector()) {
- FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
- } else {
- FLAG_SET_ERGO(bool, UseParallelGC, true);
- }
- no_shared_spaces();
- }
- }
- #ifndef ZERO
- #ifdef _LP64
- // Check that UseCompressedOops can be set with the max heap size allocated
- // by ergonomics.
- if (MaxHeapSize <= max_heap_for_compressed_oops()) {
- #if !defined(COMPILER1) || defined(TIERED)
- if (FLAG_IS_DEFAULT(UseCompressedOops)) {
- FLAG_SET_ERGO(bool, UseCompressedOops, true);
- }
- #endif
- #ifdef _WIN64
- if (UseLargePages && UseCompressedOops) {
- // Cannot allocate guard pages for implicit checks in indexed addressing
- // mode, when large pages are specified on windows.
- // This flag could be switched ON if narrow oop base address is set to 0,
- // see code in Universe::initialize_heap().
- Universe::set_narrow_oop_use_implicit_null_checks(false);
- }
- #endif // _WIN64
- } else {
- if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
- warning("Max heap size too large for Compressed Oops");
- FLAG_SET_DEFAULT(UseCompressedOops, false);
- }
- }
- // Also checks that certain machines are slower with compressed oops
- // in vm_version initialization code.
- #endif // _LP64
- #endif // !ZERO
- }
- void Arguments::set_parallel_gc_flags() {
- assert(UseParallelGC || UseParallelOldGC, "Error");
- // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
- if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
- FLAG_SET_DEFAULT(UseParallelOldGC, true);
- }
- FLAG_SET_DEFAULT(UseParallelGC, true);
- // If no heap maximum was requested explicitly, use some reasonable fraction
- // of the physical memory, up to a maximum of 1GB.
- if (UseParallelGC) {
- FLAG_SET_DEFAULT(ParallelGCThreads,
- Abstract_VM_Version::parallel_worker_threads());
- // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
- // SurvivorRatio has been set, reset their default values to SurvivorRatio +
- // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
- // See CR 6362902 for details.
- if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
- if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
- FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
- }
- if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
- FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
- }
- }
- if (UseParallelOldGC) {
- // Par compact uses lower default values since they are treated as
- // minimums. These are different defaults because of the different
- // interpretation and are not ergonomically set.
- if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
- FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
- }
- if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
- FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
- }
- }
- }
- if (UseNUMA) {
- if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
- FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
- }
- // For those collectors or operating systems (eg, Windows) that do
- // not support full UseNUMA, we will map to UseNUMAInterleaving for now
- UseNUMAInterleaving = true;
- }
- }
- void Arguments::set_g1_gc_flags() {
- assert(UseG1GC, "Error");
- #ifdef COMPILER1
- FastTLABRefill = false;
- #endif
- FLAG_SET_DEFAULT(ParallelGCThreads,
- Abstract_VM_Version::parallel_worker_threads());
- if (ParallelGCThreads == 0) {
- FLAG_SET_DEFAULT(ParallelGCThreads,
- Abstract_VM_Version::parallel_worker_threads());
- }
- no_shared_spaces();
- if (FLAG_IS_DEFAULT(MarkStackSize)) {
- FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
- }
- if (PrintGCDetails && Verbose) {
- tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
- MarkStackSize / K, MarkStackSizeMax / K);
- tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
- }
- if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
- // In G1, we want the default GC overhead goal to be higher than
- // say in PS. So we set it here to 10%. Otherwise the heap might
- // be expanded more aggressively than we would like it to. In
- // fact, even 10% seems to not be high enough in some cases
- // (especially small GC stress tests that the main thing they do
- // is allocation). We might consider increase it further.
- FLAG_SET_DEFAULT(GCTimeRatio, 9);
- }
- }
- void Arguments::set_heap_size() {
- if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
- // Deprecated flag
- FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
- }
- const julong phys_mem =
- FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
- : (julong)MaxRAM;
- // If the maximum heap size has not been set with -Xmx,
- // then set it as fraction of the size of physical memory,
- // respecting the maximum and minimum sizes of the heap.
- if (FLAG_IS_DEFAULT(MaxHeapSize)) {
- julong reasonable_max = phys_mem / MaxRAMFraction;
- if (phys_mem <= MaxHeapSize * MinRAMFraction) {
- // Small physical memory, so use a minimum fraction of it for the heap
- reasonable_max = phys_mem / MinRAMFraction;
- } else {
- // Not-small physical memory, so require a heap at least
- // as large as MaxHeapSize
- reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
- }
- if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
- // Limit the heap size to ErgoHeapSizeLimit
- reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
- }
- if (UseCompressedOops) {
- // Limit the heap size to the maximum possible when using compressed oops
- julong max_coop_heap = (julong)max_heap_for_compressed_oops();
- if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
- // Heap should be above HeapBaseMinAddress to get zero based compressed oops
- // but it should be not less than default MaxHeapSize.
- max_coop_heap -= HeapBaseMinAddress;
- }
- reasonable_max = MIN2(reasonable_max, max_coop_heap);
- }
- reasonable_max = os::allocatable_physical_memory(reasonable_max);
- if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
- // An initial heap size was specified on the command line,
- // so be sure that the maximum size is consistent. Done
- // after call to allocatable_physical_memory because that
- // method might reduce the allocation size.
- reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
- }
- if (PrintGCDetails && Verbose) {
- // Cannot use gclog_or_tty yet.
- tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
- }
- FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
- }
- // If the initial_heap_size has not been set with InitialHeapSize
- // or -Xms, then set it as fraction of the size of physical memory,
- // respecting the maximum and minimum sizes of the heap.
- if (FLAG_IS_DEFAULT(InitialHeapSize)) {
- julong reasonable_minimum = (julong)(OldSize + NewSize);
- reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
- reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
- julong reasonable_initial = phys_mem / InitialRAMFraction;
- reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
- reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
- reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
- if (PrintGCDetails && Verbose) {
- // Cannot use gclog_or_tty yet.
- tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
- tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
- }
- FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
- set_min_heap_size((uintx)reasonable_minimum);
- }
- }
- // This must be called after ergonomics because we want bytecode rewriting
- // if the server compiler is used, or if UseSharedSpaces is disabled.
- void Arguments::set_bytecode_flags() {
- // Better not attempt to store into a read-only space.
- if (UseSharedSpaces) {
- FLAG_SET_DEFAULT(RewriteBytecodes, false);
- FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
- }
- if (!RewriteBytecodes) {
- FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
- }
- }
- // Aggressive optimization flags -XX:+AggressiveOpts
- void Arguments::set_aggressive_opts_flags() {
- #ifdef COMPILER2
- if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
- if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
- FLAG_SET_DEFAULT(EliminateAutoBox, true);
- }
- if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
- FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
- }
- // Feed the cache size setting into the JDK
- char buffer[1024];
- sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
- add_property(buffer);
- }
- if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
- FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
- }
- #endif
- if (AggressiveOpts) {
- // Sample flag setting code
- // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
- // FLAG_SET_DEFAULT(EliminateZeroing, true);
- // }
- }
- }
- //===========================================================================================================
- // Parsing of java.compiler property
- void Arguments::process_java_compiler_argument(char* arg) {
- // For backwards compatibility, Djava.compiler=NONE or ""
- // causes us to switch to -Xint mode UNLESS -Xdebug
- // is also specified.
- if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
- set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
- }
- }
- void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
- _sun_java_launcher = strdup(launcher);
- if (strcmp("gamma", _sun_java_launcher) == 0) {
- _created_by_gamma_launcher = true;
- }
- }
- bool Arguments::created_by_java_launcher() {
- assert(_sun_java_launcher != NULL, "property must have value");
- return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
- }
- bool Arguments::created_by_gamma_launcher() {
- return _created_by_gamma_launcher;
- }
- //===========================================================================================================
- // Parsing of main arguments
- bool Arguments::verify_interval(uintx val, uintx min,
- uintx max, const char* name) {
- // Returns true iff value is in the inclusive interval [min..max]
- // false, otherwise.
- if (val >= min && val <= max) {
- return true;
- }
- jio_fprintf(defaultStream::error_stream(),
- "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
- " and " UINTX_FORMAT "\n",
- name, val, min, max);
- return false;
- }
- bool Arguments::verify_min_value(intx val, intx min, const char* name) {
- // Returns true if given value is at least specified min threshold
- // false, otherwise.
- if (val >= min ) {
- return true;
- }
- jio_fprintf(defaultStream::error_stream(),
- "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
- name, val, min);
- return false;
- }
- bool Arguments::verify_percentage(uintx value, const char* name) {
- if (value <= 100) {
- return true;
- }
- jio_fprintf(defaultStream::error_stream(),
- "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
- name, value);
- return false;
- }
- static void force_serial_gc() {
- FLAG_SET_DEFAULT(UseSerialGC, true);
- FLAG_SET_DEFAULT(UseParNewGC, false);
- FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
- FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
- FLAG_SET_DEFAULT(UseParallelGC, false);
- FLAG_SET_DEFAULT(UseParallelOldGC, false);
- FLAG_SET_DEFAULT(UseG1GC, false);
- }
- static bool verify_serial_gc_flags() {
- return (UseSerialGC &&
- !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
- UseParallelGC || UseParallelOldGC));
- }
- // check if do gclog rotation
- // +UseGCLogFileRotation is a must,
- // no gc log rotation when log file not supplied or
- // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
- void check_gclog_consistency() {
- if (UseGCLogFileRotation) {
- if ((Arguments::gc_log_filename() == NULL) ||
- (NumberOfGCLogFiles == 0) ||
- (GCLogFileSize == 0)) {
- jio_fprintf(defaultStream::output_stream(),
- "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
- "where num_of_file > 0 and num_of_size > 0\n"
- "GC log rotation is turned off\n");
- UseGCLogFileRotation = false;
- }
- }
- if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
- FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
- jio_fprintf(defaultStream::output_stream(),
- "GCLogFileSize changed to minimum 8K\n");
- }
- }
- // Check consistency of GC selection
- bool Arguments::check_gc_consistency() {
- check_gclog_consistency();
- bool status = true;
- // Ensure that the user has not selected conflicting sets
- // of collectors. [Note: this check is merely a user convenience;
- // collectors over-ride each other so that only a non-conflicting
- // set is selected; however what the user gets is not what they
- // may have expected from the combination they asked for. It's
- // better to reduce user confusion by not allowing them to
- // select conflicting combinations.
- uint i = 0;
- if (UseSerialGC) i++;
- if (UseConcMarkSweepGC || UseParNewGC) i++;
- if (UseParallelGC || UseParallelOldGC) i++;
- if (UseG1GC) i++;
- if (i > 1) {
- jio_fprintf(defaultStream::error_stream(),
- "Conflicting collector combinations in option list; "
- "please refer to the release notes for the combinations "
- "allowed\n");
- status = false;
- }
- return status;
- }
- // Check stack pages settings
- bool Arguments::check_stack_pages()
- {
- bool status = true;
- status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
- status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
- // greater stack shadow pages can't generate instruction to bang stack
- status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
- return status;
- }
- // Check the consistency of vm_init_args
- bool Arguments::check_vm_args_consistency() {
- // Method for adding checks for flag consistency.
- // The intent is to warn the user of all possible conflicts,
- // before returning an error.
- // Note: Needs platform-dependent factoring.
- bool status = true;
- #if ( (defined(COMPILER2) && defined(SPARC)))
- // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
- // on sparc doesn't require generation of a stub as is the case on, e.g.,
- // x86. Normally, VM_Version_init must be called from init_globals in
- // init.cpp, which is called by the initial java thread *after* arguments
- // have been parsed. VM_Version_init gets called twice on sparc.
- extern void VM_Version_init();
- VM_Version_init();
- if (!VM_Version::has_v9()) {
- jio_fprintf(defaultStream::error_stream(),
- "V8 Machine detected, Server requires V9\n");
- status = false;
- }
- #endif /* COMPILER2 && SPARC */
- // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
- // builds so the cost of stack banging can be measured.
- #if (defined(PRODUCT) && defined(SOLARIS))
- if (!UseBoundThreads && !UseStackBanging) {
- jio_fprintf(defaultStream::error_stream(),
- "-UseStackBanging conflicts with -UseBoundThreads\n");
- status = false;
- }
- #endif
- if (TLABRefillWasteFraction == 0) {
- jio_fprintf(defaultStream::error_stream(),
- "TLABRefillWasteFraction should be a denominator, "
- "not " SIZE_FORMAT "\n",
- TLABRefillWasteFraction);
- status = false;
- }
- status = status && verify_percentage(AdaptiveSizePolicyWeight,
- "AdaptiveSizePolicyWeight");
- status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
- status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
- status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
- status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
- if (MinHeapFreeRatio > MaxHeapFreeRatio) {
- jio_fprintf(defaultStream::error_stream(),
- "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
- "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
- MinHeapFreeRatio, MaxHeapFreeRatio);
- status = false;
- }
- // Keeping the heap 100% free is hard ;-) so limit it to 99%.
- MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
- if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
- MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
- }
- if (UseParallelOldGC && ParallelOldGCSplitALot) {
- // Settings to encourage splitting.
- if (!FLAG_IS_CMDLINE(NewRatio)) {
- FLAG_SET_CMDLINE(intx, NewRatio, 2);
- }
- if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
- FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
- }
- }
- status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
- status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
- if (GCTimeLimit == 100) {
- // Turn off gc-overhead-limit-exceeded checks
- FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
- }
- status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
- status = status && check_gc_consistency();
- status = status && check_stack_pages();
- if (_has_alloc_profile) {
- if (UseParallelGC || UseParallelOldGC) {
- jio_fprintf(defaultStream::error_stream(),
- "error: invalid argument combination.\n"
- "Allocation profiling (-Xaprof) cannot be used together with "
- "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
- status = false;
- }
- if (UseConcMarkSweepGC) {
- jio_fprintf(defaultStream::error_stream(),
- "error: invalid argument combination.\n"
- "Allocation profiling (-Xaprof) cannot be used together with "
- "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
- status = false;
- }
- }
- if (CMSIncrementalMode) {
- if (!UseConcMarkSweepGC) {
- jio_fprintf(defaultStream::error_stream(),
- "error: invalid argument combination.\n"
- "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
- "selected in order\nto use CMSIncrementalMode.\n");
- status = false;
- } else {
- status = status && verify_percentage(CMSIncrementalDutyCycle,
- "CMSIncrementalDutyCycle");
- status = status && verify_percentage(CMSIncrementalDutyCycleMin,
- "CMSIncrementalDutyCycleMin");
- status = status && verify_percentage(CMSIncrementalSafetyFactor,
- "CMSIncrementalSafetyFactor");
- status = status && verify_percentage(CMSIncrementalOffset,
- "CMSIncrementalOffset");
- status = status && verify_percentage(CMSExpAvgFactor,
- "CMSExpAvgFactor");
- // If it was not set on the command line, set
- // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
- if (CMSInitiatingOccupancyFraction < 0) {
- FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
- }
- }
- }
- // CMS space iteration, which FLSVerifyAllHeapreferences entails,
- // insists that we hold the requisite locks so that the iteration is
- // MT-safe. For the verification at start-up and shut-down, we don't
- // yet have a good way of acquiring and releasing these locks,
- // which are not visible at the CollectedHeap level. We want to
- // be able to acquire these locks and then do the iteration rather
- // than just disable the lock verification. This will be fixed under
- // bug 4788986.
- if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
- if (VerifyGCStartAt == 0) {
- warning("Heap verification at start-up disabled "
- "(due to current incompatibility with FLSVerifyAllHeapReferences)");
- VerifyGCStartAt = 1; // Disable verification at start-up
- }
- if (VerifyBeforeExit) {
- warning("Heap verification at shutdown disabled "
- "(due to current incompatibility with FLSVerifyAllHeapReferences)");
- VerifyBeforeExit = false; // Disable verification at shutdown
- }
- }
- // Note: only executed in non-PRODUCT mode
- if (!UseAsyncConcMarkSweepGC &&
- (ExplicitGCInvokesConcurrent ||
- ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
- jio_fprintf(defaultStream::error_stream(),
- "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
- " with -UseAsyncConcMarkSweepGC");
- status = false;
- }
- status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
- #ifndef SERIALGC
- if (UseG1GC) {
- status = status && verify_percentage(InitiatingHeapOccupancyPercent,
- "InitiatingHeapOccupancyPercent");
- status = status && verify_min_value(G1RefProcDrainInterval, 1,
- "G1RefProcDrainInterval");
- status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
- "G1ConcMarkStepDurationMillis");
- }
- #endif
- status = status && verify_interval(RefDiscoveryPolicy,
- ReferenceProcessor::DiscoveryPolicyMin,
- ReferenceProcessor::DiscoveryPolicyMax,
- "RefDiscoveryPolicy");
- // Limit the lower bound of this flag to 1 as it is used in a division
- // expression.
- status = status && verify_interval(TLABWasteTargetPercent,
- 1, 100, "TLABWasteTargetPercent");
- status = status && verify_object_alignment();
- return status;
- }
- bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
- const char* option_type) {
- if (ignore) return false;
- const char* spacer = " ";
- if (option_type == NULL) {
- option_type = ++spacer; // Set both to the empty string.
- }
- if (os::obsolete_option(option)) {
- jio_fprintf(defaultStream::error_stream(),
- "Obsolete %s%soption: %s\n", option_type, spacer,
- option->optionString);
- return false;
- } else {
- jio_fprintf(defaultStream::error_stream(),
- "Unrecognized %s%soption: %s\n", option_type, spacer,
- option->optionString);
- return true;
- }
- }
- static const char* user_assertion_options[] = {
- "-da", "-ea", "-disableassertions", "-enableassertions", 0
- };
- static const char* system_assertion_options[] = {
- "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
- };
- // Return true if any of the strings in null-terminated array 'names' matches.
- // If tail_allowed is true, then the tail must begin with a colon; otherwise,
- // the option must match exactly.
- static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
- bool tail_allowed) {
- for (/* empty */; *names != NULL; ++names) {
- if (match_option(option, *names, tail)) {
- if (**tail == '\0' || tail_allowed && **tail == ':') {
- return true;
- }
- }
- }
- return false;
- }
- bool Arguments::parse_uintx(const char* value,
- uintx* uintx_arg,
- uintx min_size) {
- // Check the sign first since atomull() parses only unsigned values.
- bool value_is_positive = !(*value == '-');
- if (value_is_positive) {
- julong n;
- bool good_return = atomull(value, &n);
- if (good_return) {
- bool above_minimum = n >= min_size;
- bool value_is_too_large = n > max_uintx;
- if (above_minimum && !value_is_too_large) {
- *uintx_arg = n;
- return true;
- }
- }
- }
- return false;
- }
- Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
- julong* long_arg,
- julong min_size) {
- if (!atomull(s, long_arg)) return arg_unreadable;
- return check_memory_size(*long_arg, min_size);
- }
- // Parse JavaVMInitArgs structure
- jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
- // For components of the system classpath.
- SysClassPath scp(Arguments::get_sysclasspath());
- bool scp_assembly_required = false;
- // Save default settings for some mode flags
- Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
- Arguments::_UseOnStackReplacement = UseOnStackReplacement;
- Arguments::_ClipInlining = ClipInlining;
- Arguments::_BackgroundCompilation = BackgroundCompilation;
- // Setup flags for mixed which is the default
- set_mode_flags(_mixed);
- // Parse JAVA_TOOL_OPTIONS environment variable (if present)
- jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
- if (result != JNI_OK) {
- return result;
- }
- // Parse JavaVMInitArgs structure passed in
- result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
- if (result != JNI_OK) {
- return result;
- }
- if (AggressiveOpts) {
- // Insert alt-rt.jar between user-specified bootclasspath
- // prefix and the default bootclasspath. os::set_boot_path()
- // uses meta_index_dir as the default bootclasspath directory.
- const char* altclasses_jar = "alt-rt.jar";
- size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
- strlen(altclasses_jar);
- char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
- strcpy(altclasses_path, get_meta_index_dir());
- strcat(altclasses_path, altclasses_jar);
- scp.add_suffix_to_prefix(altclasses_path);
- scp_assembly_required = true;
- FREE_C_HEAP_ARRAY(char, altclasses_path);
- }
- // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
- result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
- if (result != JNI_OK) {
- return result;
- }
- // Do final processing now that all arguments have been parsed
- result = finalize_vm_init_args(&scp, scp_assembly_required);
- if (result != JNI_OK) {
- return result;
- }
- return JNI_OK;
- }
- jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
- SysClassPath* scp_p,
- bool* scp_assembly_required_p,
- FlagValueOrigin origin) {
- // Remaining part of option string
- const char* tail;
- // iterate over arguments
- for (int index = 0; index < args->nOptions; index++) {
- bool is_absolute_path = false; // for -agentpath vs -agentlib
- const JavaVMOption* option = args->options + index;
- if (!match_option(option, "-Djava.class.path", &tail) &&
- !match_option(option, "-Dsun.java.command", &tail) &&
- !match_option(option, "-Dsun.java.launcher", &tail)) {
- // add all jvm options to the jvm_args string. This string
- // is used later to set the java.vm.args PerfData string constant.
- // the -Djava.class.path and the -Dsun.java.command options are
- // omitted from jvm_args string as each have their own PerfData
- // string constant object.
- build_jvm_args(option->optionString);
- }
- // -verbose:[class/gc/jni]
- if (match_option(option, "-verbose", &tail)) {
- if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
- FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
- FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
- } else if (!strcmp(tail, ":gc")) {
- FLAG_SET_CMDLINE(bool, PrintGC, true);
- } else if (!strcmp(tail, ":jni")) {
- FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
- }
- // -da / -ea / -disableassertions / -enableassertions
- // These accept an optional class/package name separated by a colon, e.g.,
- // -da:java.lang.Thread.
- } else if (match_option(option, user_assertion_options, &tail, true)) {
- bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
- if (*tail == '\0') {
- JavaAssertions::setUserClassDefault(enable);
- } else {
- assert(*tail == ':', "bogus match by match_option()");
- JavaAssertions::addOption(tail + 1, enable);
- }
- // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
- } else if (match_option(option, system_assertion_options, &tail, false)) {
- bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
- JavaAssertions::setSystemClassDefault(enable);
- // -bootclasspath:
- } else if (match_option(option, "-Xbootclasspath:", &tail)) {
- scp_p->reset_path(tail);
- *scp_assembly_required_p = true;
- // -bootclasspath/a:
- } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
- scp_p->add_suffix(tail);
- *scp_assembly_required_p = true;
- // -bootclasspath/p:
- } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
- scp_p->add_prefix(tail);
- *scp_assembly_required_p = true;
- // -Xrun
- } else if (match_option(option, "-Xrun", &tail)) {
- if (tail != NULL) {
- const char* pos = strchr(tail, ':');
- size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
- char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
- name[len] = '\0';
- char *options = NULL;
- if(pos != NULL) {
- size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
- options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
- }
- #ifdef JVMTI_KERNEL
- if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
- warning("profiling and debugging agents are not supported with Kernel VM");
- } else
- #endif // JVMTI_KERNEL
- add_init_library(name, options);
- }
- // -agentlib and -agentpath
- } else if (match_option(option, "-agentlib:", &tail) ||
- (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
- if(tail != NULL) {
- const char* pos = strchr(tail, '=');
- size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
- char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
- name[len] = '\0';
- char *options = NULL;
- if(pos != NULL) {
- options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
- }
- #ifdef JVMTI_KERNEL
- if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
- warning("profiling and debugging agents are not supported with Kernel VM");
- } else
- #endif // JVMTI_KERNEL
- add_init_agent(name, options, is_absolute_path);
- }
- // -javaagent
- } else if (match_option(option, "-javaagent:", &tail)) {
- if(tail != NULL) {
- char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
- add_init_agent("instrument", options, false);
- }
- // -Xnoclassgc
- } else if (match_option(option, "-Xnoclassgc", &tail)) {
- FLAG_SET_CMDLINE(bool, ClassUnloading, false);
- // -Xincgc: i-CMS
- } else if (match_option(option, "-Xincgc", &tail)) {
- FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
- FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
- // -Xnoincgc: no i-CMS
- } else if (match_option(option, "-Xnoincgc", &tail)) {
- FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
- FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
- // -Xconcgc
- } else if (match_option(option, "-Xconcgc", &tail)) {
- FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
- // -Xnoconcgc
- } else if (match_option(option, "-Xnoconcgc", &tail)) {
- FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
- // -Xbatch
- } else if (match_option(option, "-Xbatch", &tail)) {
- FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
- // -Xmn for compatibility with other JVM vendors
- } else if (match_option(option, "-Xmn", &tail)) {
- julong long_initial_eden_size = 0;
- ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid initial eden size: %s\n", option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
- FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
- // -Xms
- } else if (match_option(option, "-Xms", &tail)) {
- julong long_initial_heap_size = 0;
- ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid initial heap size: %s\n", option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
- // Currently the minimum size and the initial heap sizes are the same.
- set_min_heap_size(InitialHeapSize);
- // -Xmx
- } else if (match_option(option, "-Xmx", &tail)) {
- julong long_max_heap_size = 0;
- ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid maximum heap size: %s\n", option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
- // Xmaxf
- } else if (match_option(option, "-Xmaxf", &tail)) {
- int maxf = (int)(atof(tail) * 100);
- if (maxf < 0 || maxf > 100) {
- jio_fprintf(defaultStream::error_stream(),
- "Bad max heap free percentage size: %s\n",
- option->optionString);
- return JNI_EINVAL;
- } else {
- FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
- }
- // Xminf
- } else if (match_option(option, "-Xminf", &tail)) {
- int minf = (int)(atof(tail) * 100);
- if (minf < 0 || minf > 100) {
- jio_fprintf(defaultStream::error_stream(),
- "Bad min heap free percentage size: %s\n",
- option->optionString);
- return JNI_EINVAL;
- } else {
- FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
- }
- // -Xss
- } else if (match_option(option, "-Xss", &tail)) {
- julong long_ThreadStackSize = 0;
- ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid thread stack size: %s\n", option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- // Internally track ThreadStackSize in units of 1024 bytes.
- FLAG_SET_CMDLINE(intx, ThreadStackSize,
- round_to((int)long_ThreadStackSize, K) / K);
- // -Xoss
- } else if (match_option(option, "-Xoss", &tail)) {
- // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
- // -Xmaxjitcodesize
- } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
- match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
- julong long_ReservedCodeCacheSize = 0;
- ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
- (size_t)InitialCodeCacheSize);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
- option->optionString, InitialCodeCacheSize/K);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
- // -green
- } else if (match_option(option, "-green", &tail)) {
- jio_fprintf(defaultStream::error_stream(),
- "Green threads support not available\n");
- return JNI_EINVAL;
- // -native
- } else if (match_option(option, "-native", &tail)) {
- // HotSpot always uses native threads, ignore silently for compatibility
- // -Xsqnopause
- } else if (match_option(option, "-Xsqnopause", &tail)) {
- // EVM option, ignore silently for compatibility
- // -Xrs
- } else if (match_option(option, "-Xrs", &tail)) {
- // Classic/EVM option, new functionality
- FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
- } else if (match_option(option, "-Xusealtsigs", &tail)) {
- // change default internal VM signals used - lower case for back compat
- FLAG_SET_CMDLINE(bool, UseAltSigs, true);
- // -Xoptimize
- } else if (match_option(option, "-Xoptimize", &tail)) {
- // EVM option, ignore silently for compatibility
- // -Xprof
- } else if (match_option(option, "-Xprof", &tail)) {
- #ifndef FPROF_KERNEL
- _has_profile = true;
- #else // FPROF_KERNEL
- // do we have to exit?
- warning("Kernel VM does not support flat profiling.");
- #endif // FPROF_KERNEL
- // -Xaprof
- } else if (match_option(option, "-Xaprof", &tail)) {
- _has_alloc_profile = true;
- // -Xconcurrentio
- } else if (match_option(option, "-Xconcurrentio", &tail)) {
- FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
- FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
- FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
- FLAG_SET_CMDLINE(bool, UseTLAB, false);
- FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
- // -Xinternalversion
- } else if (match_option(option, "-Xinternalversion", &tail)) {
- jio_fprintf(defaultStream::output_stream(), "%s\n",
- VM_Version::internal_vm_info_string());
- vm_exit(0);
- #ifndef PRODUCT
- // -Xprintflags
- } else if (match_option(option, "-Xprintflags", &tail)) {
- CommandLineFlags::printFlags(tty, false);
- vm_exit(0);
- #endif
- // -D
- } else if (match_option(option, "-D", &tail)) {
- if (!add_property(tail)) {
- return JNI_ENOMEM;
- }
- // Out of the box management support
- if (match_option(option, "-Dcom.sun.management", &tail)) {
- FLAG_SET_CMDLINE(bool, ManagementServer, true);
- }
- // -Xint
- } else if (match_option(option, "-Xint", &tail)) {
- set_mode_flags(_int);
- // -Xmixed
- } else if (match_option(option, "-Xmixed", &tail)) {
- set_mode_flags(_mixed);
- // -Xcomp
- } else if (match_option(option, "-Xcomp", &tail)) {
- // for testing the compiler; turn off all flags that inhibit compilation
- set_mode_flags(_comp);
- // -Xshare:dump
- } else if (match_option(option, "-Xshare:dump", &tail)) {
- #ifdef TIERED
- FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
- set_mode_flags(_int); // Prevent compilation, which creates objects
- #elif defined(COMPILER2)
- vm_exit_during_initialization(
- "Dumping a shared archive is not supported on the Server JVM.", NULL);
- #elif defined(KERNEL)
- vm_exit_during_initialization(
- "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
- #else
- FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
- set_mode_flags(_int); // Prevent compilation, which creates objects
- #endif
- // -Xshare:on
- } else if (match_option(option, "-Xshare:on", &tail)) {
- FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
- FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
- // -Xshare:auto
- } else if (match_option(option, "-Xshare:auto", &tail)) {
- FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
- FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
- // -Xshare:off
- } else if (match_option(option, "-Xshare:off", &tail)) {
- FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
- FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
- // -Xverify
- } else if (match_option(option, "-Xverify", &tail)) {
- if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
- FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
- FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
- } else if (strcmp(tail, ":remote") == 0) {
- FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
- FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
- } else if (strcmp(tail, ":none") == 0) {
- FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
- FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
- } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
- return JNI_EINVAL;
- }
- // -Xdebug
- } else if (match_option(option, "-Xdebug", &tail)) {
- // note this flag has been used, then ignore
- set_xdebug_mode(true);
- // -Xnoagent
- } else if (match_option(option, "-Xnoagent", &tail)) {
- // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
- } else if (match_option(option, "-Xboundthreads", &tail)) {
- // Bind user level threads to kernel threads (Solaris only)
- FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
- } else if (match_option(option, "-Xloggc:", &tail)) {
- // Redirect GC output to the file. -Xloggc:<filename>
- // ostream_init_log(), when called will use this filename
- // to initialize a fileStream.
- _gc_log_filename = strdup(tail);
- FLAG_SET_CMDLINE(bool, PrintGC, true);
- FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
- // JNI hooks
- } else if (match_option(option, "-Xcheck", &tail)) {
- if (!strcmp(tail, ":jni")) {
- CheckJNICalls = true;
- } else if (is_bad_option(option, args->ignoreUnrecognized,
- "check")) {
- return JNI_EINVAL;
- }
- } else if (match_option(option, "vfprintf", &tail)) {
- _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
- } else if (match_option(option, "exit", &tail)) {
- _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
- } else if (match_option(option, "abort", &tail)) {
- _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
- // -XX:+AggressiveHeap
- } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
- // This option inspects the machine and attempts to set various
- // parameters to be optimal for long-running, memory allocation
- // intensive jobs. It is intended for machines with large
- // amounts of cpu and memory.
- // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
- // VM, but we may not be able to represent the total physical memory
- // available (like having 8gb of memory on a box but using a 32bit VM).
- // Thus, we need to make sure we're using a julong for intermediate
- // calculations.
- julong initHeapSize;
- julong total_memory = os::physical_memory();
- if (total_memory < (julong)256*M) {
- jio_fprintf(defaultStream::error_stream(),
- "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
- vm_exit(1);
- }
- // The heap size is half of available memory, or (at most)
- // all of possible memory less 160mb (leaving room for the OS
- // when using ISM). This is the maximum; because adaptive sizing
- // is turned on below, the actual space used may be smaller.
- initHeapSize = MIN2(total_memory / (julong)2,
- total_memory - (julong)160*M);
- // Make sure that if we have a lot of memory we cap the 32 bit
- // process space. The 64bit VM version of this function is a nop.
- initHeapSize = os::allocatable_physical_memory(initHeapSize);
- // The perm gen is separate but contiguous with the
- // object heap (and is reserved with it) so subtract it
- // from the heap size.
- if (initHeapSize > MaxPermSize) {
- initHeapSize = initHeapSize - MaxPermSize;
- } else {
- warning("AggressiveHeap and MaxPermSize values may conflict");
- }
- if (FLAG_IS_DEFAULT(MaxHeapSize)) {
- FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
- FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
- // Currently the minimum size and the initial heap sizes are the same.
- set_min_heap_size(initHeapSize);
- }
- if (FLAG_IS_DEFAULT(NewSize)) {
- // Make the young generation 3/8ths of the total heap.
- FLAG_SET_CMDLINE(uintx, NewSize,
- ((julong)MaxHeapSize / (julong)8) * (julong)3);
- FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
- }
- FLAG_SET_DEFAULT(UseLargePages, true);
- // Increase some data structure sizes for efficiency
- FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
- FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
- FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
- // See the OldPLABSize comment below, but replace 'after promotion'
- // with 'after copying'. YoungPLABSize is the size of the survivor
- // space per-gc-thread buffers. The default is 4kw.
- FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
- // OldPLABSize is the size of the buffers in the old gen that
- // UseParallelGC uses to promote live data that doesn't fit in the
- // survivor spaces. At any given time, there's one for each gc thread.
- // The default size is 1kw. These buffers are rarely used, since the
- // survivor spaces are usually big enough. For specjbb, however, there
- // are occasions when there's lots of live data in the young gen
- // and we end up promoting some of it. We don't have a definite
- // explanation for why bumping OldPLABSize helps, but the theory
- // is that a bigger PLAB results in retaining something like the
- // original allocation order after promotion, which improves mutator
- // locality. A minor effect may be that larger PLABs reduce the
- // number of PLAB allocation events during gc. The value of 8kw
- // was arrived at by experimenting with specjbb.
- FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
- // Enable parallel GC and adaptive generation sizing
- FLAG_SET_CMDLINE(bool, UseParallelGC, true);
- FLAG_SET_DEFAULT(ParallelGCThreads,
- Abstract_VM_Version::parallel_worker_threads());
- // Encourage steady state memory management
- FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
- // This appears to improve mutator locality
- FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
- // Get around early Solaris scheduling bug
- // (affinity vs other jobs on system)
- // but disallow DR and offlining (5008695).
- FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
- } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
- // The last option must always win.
- FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
- FLAG_SET_CMDLINE(bool, NeverTenure, true);
- } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
- // The last option must always win.
- FLAG_SET_CMDLINE(bool, NeverTenure, false);
- FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
- } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
- match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
- jio_fprintf(defaultStream::error_stream(),
- "Please use CMSClassUnloadingEnabled in place of "
- "CMSPermGenSweepingEnabled in the future\n");
- } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
- FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
- jio_fprintf(defaultStream::error_stream(),
- "Please use -XX:+UseGCOverheadLimit in place of "
- "-XX:+UseGCTimeLimit in the future\n");
- } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
- FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
- jio_fprintf(defaultStream::error_stream(),
- "Please use -XX:-UseGCOverheadLimit in place of "
- "-XX:-UseGCTimeLimit in the future\n");
- // The TLE options are for compatibility with 1.3 and will be
- // removed without notice in a future release. These options
- // are not to be documented.
- } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
- // No longer used.
- } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
- FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
- } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
- FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
- } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
- FLAG_SET_CMDLINE(bool, PrintTLAB, true);
- } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
- FLAG_SET_CMDLINE(bool, PrintTLAB, false);
- } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
- // No longer used.
- } else if (match_option(option, "-XX:TLESize=", &tail)) {
- julong long_tlab_size = 0;
- ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid TLAB size: %s\n", option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
- } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
- // No longer used.
- } else if (match_option(option, "-XX:+UseTLE", &tail)) {
- FLAG_SET_CMDLINE(bool, UseTLAB, true);
- } else if (match_option(option, "-XX:-UseTLE", &tail)) {
- FLAG_SET_CMDLINE(bool, UseTLAB, false);
- SOLARIS_ONLY(
- } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
- warning("-XX:+UsePermISM is obsolete.");
- FLAG_SET_CMDLINE(bool, UseISM, true);
- } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
- FLAG_SET_CMDLINE(bool, UseISM, false);
- )
- } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
- FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
- FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
- } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
- FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
- FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
- } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
- #if defined(DTRACE_ENABLED)
- FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
- FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
- FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
- FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
- #else // defined(DTRACE_ENABLED)
- jio_fprintf(defaultStream::error_stream(),
- "ExtendedDTraceProbes flag is not applicable for this configuration\n");
- return JNI_EINVAL;
- #endif // defined(DTRACE_ENABLED)
- #ifdef ASSERT
- } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
- FLAG_SET_CMDLINE(bool, FullGCALot, true);
- // disable scavenge before parallel mark-compact
- FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
- #endif
- } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
- julong cms_blocks_to_claim = (julong)atol(tail);
- FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
- jio_fprintf(defaultStream::error_stream(),
- "Please use -XX:OldPLABSize in place of "
- "-XX:CMSParPromoteBlocksToClaim in the future\n");
- } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
- julong cms_blocks_to_claim = (julong)atol(tail);
- FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
- jio_fprintf(defaultStream::error_stream(),
- "Please use -XX:OldPLABSize in place of "
- "-XX:ParCMSPromoteBlocksToClaim in the future\n");
- } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
- julong old_plab_size = 0;
- ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid old PLAB size: %s\n", option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
- jio_fprintf(defaultStream::error_stream(),
- "Please use -XX:OldPLABSize in place of "
- "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
- } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
- julong young_plab_size = 0;
- ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid young PLAB size: %s\n", option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
- jio_fprintf(defaultStream::error_stream(),
- "Please use -XX:YoungPLABSize in place of "
- "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
- } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
- match_option(option, "-XX:G1MarkStackSize=", &tail)) {
- julong stack_size = 0;
- ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid mark stack size: %s\n", option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
- } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
- julong max_stack_size = 0;
- ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
- if (errcode != arg_in_range) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid maximum mark stack size: %s\n",
- option->optionString);
- describe_range_error(errcode);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
- } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
- match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
- uintx conc_threads = 0;
- if (!parse_uintx(tail, &conc_threads, 1)) {
- jio_fprintf(defaultStream::error_stream(),
- "Invalid concurrent threads: %s\n", option->optionString);
- return JNI_EINVAL;
- }
- FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
- } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
- // Skip -XX:Flags= since that case has already been handled
- if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
- if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
- return JNI_EINVAL;
- }
- }
- // Unknown option
- } else if (is_bad_option(option, args->ignoreUnrecognized)) {
- return JNI_ERR;
- }
- }
- // Change the default value for flags which have different default values
- // when working with older JDKs.
- if (JDK_Version::current().compare_major(6) <= 0 &&
- FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
- FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
- }
- #ifdef LINUX
- if (JDK_Version::current().compare_major(6) <= 0 &&
- FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
- FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
- }
- #endif // LINUX
- return JNI_OK;
- }
- jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
- // This must be done after all -D arguments have been processed.
- scp_p->expand_endorsed();
- if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
- // Assemble the bootclasspath elements into the final path.
- Arguments::set_sysclasspath(scp_p->combined_path());
- }
- // This must be done after all arguments have been processed.
- // java_compiler() true means set to "NONE" or empty.
- if (java_compiler() && !xdebug_mode()) {
- // For backwards compatibility, we switch to interpreted mode if
- // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
- // not specified.
- set_mode_flags(_int);
- }
- if (CompileThreshold == 0) {
- set_mode_flags(_int);
- }
- #ifndef COMPILER2
- // Don't degrade server performance for footprint
- if (FLAG_IS_DEFAULT(UseLargePages) &&
- MaxHeapSize < LargePageHeapSizeThreshold) {
- // No need for large granularity pages w/small heaps.
- // Note that large pages are enabled/disabled for both the
- // Java heap and the code cache.
- FLAG_SET_DEFAULT(UseLargePages, false);
- SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
- SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
- }
- // Tiered compilation is undefined with C1.
- TieredCompilation = false;
- #else
- if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
- FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
- }
- #endif
- // If we are running in a headless jre, force java.awt.headless property
- // to be true unless the property has already been set.
- // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
- if (os::is_headless_jre()) {
- const char* headless = Arguments::get_property("java.awt.headless");
- if (headless == NULL) {
- char envbuffer[128];
- if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
- if (!add_property("java.awt.headless=true")) {
- return JNI_ENOMEM;
- }
- } else {
- char buffer[256];
- strcpy(buffer, "java.awt.headless=");
- strcat(buffer, envbuffer);
- if (!add_property(buffer)) {
- return JNI_ENOMEM;
- }
- }
- }
- }
- if (!check_vm_args_consistency()) {
- return JNI_ERR;
- }
- return JNI_OK;
- }
- jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
- return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
- scp_assembly_required_p);
- }
- jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
- return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
- scp_assembly_required_p);
- }
- jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
- const int N_MAX_OPTIONS = 64;
- const int OPTION_BUFFER_SIZE = 1024;
- char buffer[OPTION_BUFFER_SIZE];
- // The variable will be ignored if it exceeds the length of the buffer.
- // Don't check this variable if user has special privileges
- // (e.g. unix su command).
- if (os::getenv(name, buffer, sizeof(buffer)) &&
- !os::have_special_privileges()) {
- JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
- jio_fprintf(defaultStream::error_stream(),
- "Picked up %s: %s\n", name, buffer);
- char* rd = buffer; // pointer to the input string (rd)
- int i;
- for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
- while (isspace(*rd)) rd++; // skip whitespace
- if (*rd == 0) break; // we re done when the input string is read completely
- // The output, option string, overwrites the input string.
- // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
- // input string (rd).
- char* wrt = rd;
- options[i++].optionString = wrt; // Fill in option
- while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
- if (*rd == '\'' || *rd == '"') { // handle a quoted string
- int quote = *rd; // matching quote to look for
- rd++; // don't copy open quote
- while (*rd != quote) { // include everything (even spaces) up until quote
- if (*rd == 0) { // string termination means unmatched string
- jio_fprintf(defaultStream::error_stream(),
- "Unmatched quote in %s\n", name);
- return JNI_ERR;
- }
- *wrt++ = *rd++; // copy to option string
- }
- rd++; // don't copy close quote
- } else {
- *wrt++ = *rd++; // copy to option string
- }
- }
- // Need to check if we're done before writing a NULL,
- // because the write could be to the byte that rd is pointing to.
- if (*rd++ == 0) {
- *wrt = 0;
- break;
- }
- *wrt = 0; // Zero terminate option
- }
- // Construct JavaVMInitArgs structure and parse as if it was part of the command line
- JavaVMInitArgs vm_args;
- vm_args.version = JNI_VERSION_1_2;
- vm_args.options = options;
- vm_args.nOptions = i;
- vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
- if (PrintVMOptions) {
- const char* tail;
- for (int i = 0; i < vm_args.nOptions; i++) {
- const JavaVMOption *option = vm_args.options + i;
- if (match_option(option, "-XX:", &tail)) {
- logOption(tail);
- }
- }
- }
- return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
- }
- return JNI_OK;
- }
- void Arguments::set_shared_spaces_flags() {
- const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
- const bool might_share = must_share || UseSharedSpaces;
- // The string table is part of the shared archive so the size must match.
- if (!FLAG_IS_DEFAULT(StringTableSize)) {
- // Disable sharing.
- if (must_share) {
- warning("disabling shared archive %s because of non-default "
- "StringTableSize", DumpSharedSpaces ? "creation" : "use");
- }
- if (might_share) {
- FLAG_SET_DEFAULT(DumpSharedSpaces, false);
- FLAG_SET_DEFAULT(RequireSharedSpaces, false);
- FLAG_SET_DEFAULT(UseSharedSpaces, false);
- }
- return;
- }
- // Check whether class data sharing settings conflict with GC, compressed oops
- // or page size, and fix them up. Explicit sharing options override other
- // settings.
- const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
- UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
- UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
- if (cannot_share) {
- if (must_share) {
- warning("selecting serial gc and disabling large pages %s"
- "because of %s", "" LP64_ONLY("and compressed oops "),
- DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
- force_serial_gc();
- FLAG_SET_CMDLINE(bool, UseLargePages, false);
- LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
- } else {
- if (UseSharedSpaces && Verbose) {
- warning("turning off use of shared archive because of "
- "choice of garbage collector or large pages");
- }
- no_shared_spaces();
- }
- } else if (UseLargePages && might_share) {
- // Disable large pages to allow shared spaces. This is sub-optimal, since
- // there may not even be a shared archive to use.
- FLAG_SET_DEFAULT(UseLargePages, false);
- }
- }
- // Disable options not supported in this release, with a warning if they
- // were explicitly requested on the command-line
- #define UNSUPPORTED_OPTION(opt, description) \
- do { \
- if (opt) { \
- if (FLAG_IS_CMDLINE(opt)) { \
- warning(description " is disabled in this release."); \
- } \
- FLAG_SET_DEFAULT(opt, false); \
- } \
- } while(0)
- // Parse entry point called from JNI_CreateJavaVM
- jint Arguments::parse(const JavaVMInitArgs* args) {
- // Sharing support
- // Construct the path to the archive
- char jvm_path[JVM_MAXPATHLEN];
- os::jvm_path(jvm_path, sizeof(jvm_path));
- char *end = strrchr(jvm_path, *os::file_separator());
- if (end != NULL) *end = '\0';
- char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
- strlen(os::file_separator()) + 20);
- if (shared_archive_path == NULL) return JNI_ENOMEM;
- strcpy(shared_archive_path, jvm_path);
- strcat(shared_archive_path, os::file_separator());
- strcat(shared_archive_path, "classes");
- DEBUG_ONLY(strcat(shared_archive_path, "_g");)
- strcat(shared_archive_path, ".jsa");
- SharedArchivePath = shared_archive_path;
- // Remaining part of option string
- const char* tail;
- // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
- bool settings_file_specified = false;
- const char* flags_file;
- int index;
- for (index = 0; index < args->nOptions; index++) {
- const JavaVMOption *option = args->options + index;
- if (match_option(option, "-XX:Flags=", &tail)) {
- flags_file = tail;
- settings_file_specified = true;
- }
- if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
- PrintVMOptions = true;
- }
- if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
- PrintVMOptions = false;
- }
- if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
- IgnoreUnrecognizedVMOptions = true;
- }
- if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
- IgnoreUnrecognizedVMOptions = false;
- }
- if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
- CommandLineFlags::printFlags(tty, false);
- vm_exit(0);
- }
- #ifndef PRODUCT
- if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
- CommandLineFlags::printFlags(tty, true);
- vm_exit(0);
- }
- #endif
- }
- if (IgnoreUnrecognizedVMOptions) {
- // uncast const to modify the flag args->ignoreUnrecognized
- *(jboolean*)(&args->ignoreUnrecognized) = true;
- }
- // Parse specified settings file
- if (settings_file_specified) {
- if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
- return JNI_EINVAL;
- }
- }
- #ifdef ASSERT
- // Parse default .hotspotrc settings file
- if (!settings_file_specified) {
- if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
- return JNI_EINVAL;
- }
- }
- #endif
- if (PrintVMOptions) {
- for (index = 0; index < args->nOptions; index++) {
- const JavaVMOption *option = args->options + index;
- if (match_option(option, "-XX:", &tail)) {
- logOption(tail);
- }
- }
- }
- // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
- jint result = parse_vm_init_args(args);
- if (result != JNI_OK) {
- return result;
- }
- #ifdef JAVASE_EMBEDDED
- UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
- #endif
- #ifndef PRODUCT
- if (TraceBytecodesAt != 0) {
- TraceBytecodes = true;
- }
- if (CountCompiledCalls) {
- if (UseCounterDecay) {
- warning("UseCounterDecay disabled because CountCalls is set");
- UseCounterDecay = false;
- }
- }
- #endif // PRODUCT
- // Transitional
- if (EnableMethodHandles || AnonymousClasses) {
- if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
- warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
- } else {
- EnableInvokeDynamic = true;
- }
- }
- // JSR 292 is not supported before 1.7
- if (!JDK_Version::is_gte_jdk17x_version()) {
- if (EnableInvokeDynamic) {
- if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
- warning("JSR 292 is not supported before 1.7. Disabling support.");
- }
- EnableInvokeDynamic = false;
- }
- }
- if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
- if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
- warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
- }
- ScavengeRootsInCode = 1;
- }
- if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
- if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
- warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
- }
- ScavengeRootsInCode = 1;
- }
- if (PrintGCDetails) {
- // Turn on -verbose:gc options as well
- PrintGC = true;
- }
- // Set object alignment values.
- set_object_alignment();
- #ifdef SERIALGC
- force_serial_gc();
- #endif // SERIALGC
- #ifdef KERNEL
- no_shared_spaces();
- #endif // KERNEL
- // Set flags based on ergonomics.
- set_ergonomics_flags();
- set_shared_spaces_flags();
- // Check the GC selections again.
- if (!check_gc_consistency()) {
- return JNI_EINVAL;
- }
- if (TieredCompilation) {
- set_tiered_flags();
- } else {
- // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
- if (CompilationPolicyChoice >= 2) {
- vm_exit_during_initialization(
- "Incompatible compilation policy selected", NULL);
- }
- }
- #ifndef KERNEL
- // Set heap size based on available physical memory
- set_heap_size();
- // Set per-collector flags
- if (UseParallelGC || UseParallelOldGC) {
- set_parallel_gc_flags();
- } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
- set_cms_and_parnew_gc_flags();
- } else if (UseParNewGC) { // skipped if CMS is set above
- set_parnew_gc_flags();
- } else if (UseG1GC) {
- set_g1_gc_flags();
- }
- #endif // KERNEL
- #ifdef SERIALGC
- assert(verify_serial_gc_flags(), "SerialGC unset");
- #endif // SERIALGC
- // Set bytecode rewriting flags
- set_bytecode_flags();
- // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
- set_aggressive_opts_flags();
- // Turn off biased locking for locking debug mode flags,
- // which are subtlely different from each other but neither works with
- // biased locking.
- if (UseHeavyMonitors
- #ifdef COMPILER1
- || !UseFastLocking
- #endif // COMPILER1
- ) {
- if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
- // flag set to true on command line; warn the user that they
- // can't enable biased locking here
- warning("Biased Locking is not supported with locking debug flags"
- "; ignoring UseBiasedLocking flag." );
- }
- UseBiasedLocking = false;
- }
- #ifdef CC_INTERP
- // Clear flags not supported by the C++ interpreter
- FLAG_SET_DEFAULT(ProfileInterpreter, false);
- FLAG_SET_DEFAULT(UseBiasedLocking, false);
- LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
- #endif // CC_INTERP
- #ifdef COMPILER2
- if (!UseBiasedLocking || EmitSync != 0) {
- UseOptoBiasInlining = false;
- }
- if (!EliminateLocks) {
- EliminateNestedLocks = false;
- }
- #endif
- if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
- warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
- DebugNonSafepoints = true;
- }
- #ifndef PRODUCT
- if (CompileTheWorld) {
- // Force NmethodSweeper to sweep whole CodeCache each time.
- if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
- NmethodSweepFraction = 1;
- }
- }
- #endif
- if (PrintCommandLineFlags) {
- CommandLineFlags::printSetFlags(tty);
- }
- // Apply CPU specific policy for the BiasedLocking
- if (UseBiasedLocking) {
- if (!VM_Version::use_biased_locking() &&
- !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
- UseBiasedLocking = false;
- }
- }
- // set PauseAtExit if the gamma launcher was used and a debugger is attached
- // but only if not already set on the commandline
- if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
- bool set = false;
- CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
- if (!set) {
- FLAG_SET_DEFAULT(PauseAtExit, true);
- }
- }
- return JNI_OK;
- }
- int Arguments::PropertyList_count(SystemProperty* pl) {
- int count = 0;
- while(pl != NULL) {
- count++;
- pl = pl->next();
- }
- return count;
- }
- const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
- assert(key != NULL, "just checking");
- SystemProperty* prop;
- for (prop = pl; prop != NULL; prop = prop->next()) {
- if (strcmp(key, prop->key()) == 0) return prop->value();
- }
- return NULL;
- }
- const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
- int count = 0;
- const char* ret_val = NULL;
- while(pl != NULL) {
- if(count >= index) {
- ret_val = pl->key();
- break;
- }
- count++;
- pl = pl->next();
- }
- return ret_val;
- }
- char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
- int count = 0;
- char* ret_val = NULL;
- while(pl != NULL) {
- if(count >= index) {
- ret_val = pl->value();
- break;
- }
- count++;
- pl = pl->next();
- }
- return ret_val;
- }
- void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
- SystemProperty* p = *plist;
- if (p == NULL) {
- *plist = new_p;
- } else {
- while (p->next() != NULL) {
- p = p->next();
- }
- p->set_next(new_p);
- }
- }
- void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
- if (plist == NULL)
- return;
- SystemProperty* new_p = new SystemProperty(k, v, true);
- PropertyList_add(plist, new_p);
- }
- // This add maintains unique property key in the list.
- void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
- if (plist == NULL)
- return;
- // If property key exist then update with new value.
- SystemProperty* prop;
- for (prop = *plist; prop != NULL; prop = prop->next()) {
- if (strcmp(k, prop->key()) == 0) {
- if (append) {
- prop->append_value(v);
- } else {
- prop->set_value(v);
- }
- return;
- }
- }
- PropertyList_add(plist, k, v);
- }
- #ifdef KERNEL
- char *Arguments::get_kernel_properties() {
- // Find properties starting with kernel and append them to string
- // We need to find out how long they are first because the URL's that they
- // might point to could get long.
- int length = 0;
- SystemProperty* prop;
- for (prop = _system_properties; prop != NULL; prop = prop->next()) {
- if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
- length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
- }
- }
- // Add one for null terminator.
- char *props = AllocateHeap(length + 1, "get_kernel_properties");
- if (length != 0) {
- int pos = 0;
- for (prop = _system_properties; prop != NULL; prop = prop->next()) {
- if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
- jio_snprintf(&props[pos], length-pos,
- "-D%s=%s ", prop->key(), prop->value());
- pos = strlen(props);
- }
- }
- }
- // null terminate props in case of null
- props[length] = '\0';
- return props;
- }
- #endif // KERNEL
- // Copies src into buf, replacing "%%" with "%" and "%p" with pid
- // Returns true if all of the source pointed by src has been copied over to
- // the destination buffer pointed by buf. Otherwise, returns false.
- // Notes:
- // 1. If the length (buflen) of the destination buffer excluding the
- // NULL terminator character is not long enough for holding the expanded
- // pid characters, it also returns false instead of returning the partially
- // expanded one.
- // 2. The passed in "buflen" should be large enough to hold the null terminator.
- bool Arguments::copy_expand_pid(const char* src, size_t srclen,
- char* buf, size_t buflen) {
- const char* p = src;
- char* b = buf;
- const char* src_end = &src[srclen];
- char* buf_end = &buf[buflen - 1];
- while (p < src_end && b < buf_end) {
- if (*p == '%') {
- switch (*(++p)) {
- case '%': // "%%" ==> "%"
- *b++ = *p++;
- break;
- case 'p': { // "%p" ==> current process id
- // buf_end points to the character before the last character so
- // that we could write '\0' to the end of the buffer.
- size_t buf_sz = buf_end - b + 1;
- int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
- // if jio_snprintf fails or the buffer is not long enough to hold
- // the expanded pid, returns false.
- if (ret < 0 || ret >= (int)buf_sz) {
- return false;
- } else {
- b += ret;
- assert(*b == '\0', "fail in copy_expand_pid");
- if (p == src_end && b == buf_end + 1) {
- // reach the end of the buffer.
- return true;
- }
- }
- p++;
- break;
- }
- default :
- *b++ = '%';
- }
- } else {
- *b++ = *p++;
- }
- }
- *b = '\0';
- return (p == src_end); // return false if not all of the source was copied
- }