| /* |
| * Copyright (c) 1997, 2014, 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/classLoader.hpp" |
| #include "classfile/javaAssertions.hpp" |
| #include "classfile/stringTable.hpp" |
| #include "classfile/symbolTable.hpp" |
| #include "compiler/compilerOracle.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/cardTableRS.hpp" |
| #include "memory/genCollectedHeap.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/arguments_ext.hpp" |
| #include "runtime/globals_extension.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/vm_version.hpp" |
| #include "services/management.hpp" |
| #include "services/memTracker.hpp" |
| #include "utilities/defaultStream.hpp" |
| #include "utilities/macros.hpp" |
| #include "utilities/stringUtils.hpp" |
| #include "utilities/taskqueue.hpp" |
| #if INCLUDE_ALL_GCS |
| #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" |
| #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
| #endif // INCLUDE_ALL_GCS |
| |
| // Note: This is a special bug reporting site for the JVM |
| #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" |
| #define DEFAULT_JAVA_LAUNCHER "generic" |
| |
| // 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) |
| |
| #define UNSUPPORTED_GC_OPTION(gc) \ |
| do { \ |
| if (gc) { \ |
| if (FLAG_IS_CMDLINE(gc)) { \ |
| warning(#gc " is not supported in this VM. Using Serial GC."); \ |
| } \ |
| FLAG_SET_DEFAULT(gc, false); \ |
| } \ |
| } while(0) |
| |
| 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; |
| size_t Arguments::_conservative_max_heap_alignment = 0; |
| uintx Arguments::_min_heap_size = 0; |
| uintx Arguments::_min_heap_free_ratio = 0; |
| uintx Arguments::_max_heap_free_ratio = 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::_sun_java_launcher_is_altjvm = 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, sun.java.launcher.is_altjvm 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.is_altjvm=", &tail)) { |
| if (strcmp(tail, "true") == 0) { |
| _sun_java_launcher_is_altjvm = true; |
| } |
| 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 writable 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; |
| |
| 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) }, |
| { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| #ifdef PRODUCT |
| { "DesiredMethodLimit", |
| JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, |
| #endif // PRODUCT |
| { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, |
| { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| #ifndef ZERO |
| { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, |
| #endif // ZERO |
| { 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], mtInternal); |
| _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, mtInternal); |
| 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, mtInternal); |
| 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, mtInternal); |
| 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, mtInternal); |
| 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, mtInternal); |
| 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, mtInternal); |
| } else { |
| cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); |
| 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), mtInternal); |
| 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), mtInternal); |
| sprintf(jarpath, "%s%s%s", directory, dir_sep, name); |
| path = add_to_path(path, jarpath, false); |
| FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); |
| } |
| } |
| FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); |
| 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 = 0; |
| bool is_hex = false; |
| // Skip leading 0[xX] for hexadecimal |
| if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { |
| s += 2; |
| is_hex = true; |
| args_read = sscanf(s, JULONG_FORMAT_X, &n); |
| } else { |
| args_read = sscanf(s, JULONG_FORMAT, &n); |
| } |
| if (args_read != 1) { |
| return false; |
| } |
| while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*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, Flag::Flags origin) { |
| return CommandLineFlags::boolAtPut(name, &value, origin); |
| } |
| |
| static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags 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, Flag::Flags 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; |
| } |
| size_t size_t_v = (size_t) v; |
| if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { |
| return true; |
| } |
| return false; |
| } |
| |
| static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { |
| if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; |
| // Contract: CommandLineFlags always returns a pointer that needs freeing. |
| FREE_C_HEAP_ARRAY(char, value, mtInternal); |
| return true; |
| } |
| |
| static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags 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, mtInternal); |
| // 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, mtInternal); |
| 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, mtInternal); |
| } |
| return true; |
| } |
| |
| bool Arguments::parse_argument(const char* arg, Flag::Flags 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 "[-kmgtxKMGTX0123456789abcdefABCDEF]" |
| 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 new_count = *count + 1; |
| |
| // expand the array and add arg to the last element |
| if (*bldarray == NULL) { |
| *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); |
| } else { |
| *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); |
| } |
| (*bldarray)[*count] = os::strdup_check_oom(arg); |
| *count = new_count; |
| } |
| |
| 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>"); |
| if (_java_class_path != NULL) { |
| char* path = _java_class_path->value(); |
| st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); |
| } |
| 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->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->cr(); |
| } |
| } |
| |
| bool Arguments::process_argument(const char* arg, |
| jboolean ignore_unrecognized, Flag::Flags origin) { |
| |
| JDK_Version since = JDK_Version(); |
| |
| if (parse_argument(arg, origin) || ignore_unrecognized) { |
| return true; |
| } |
| |
| bool has_plus_minus = (*arg == '+' || *arg == '-'); |
| const char* const argname = has_plus_minus ? 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. |
| |
| size_t arg_len; |
| const char* equal_sign = strchr(argname, '='); |
| if (equal_sign == NULL) { |
| arg_len = strlen(argname); |
| } else { |
| arg_len = equal_sign - argname; |
| } |
| |
| Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); |
| if (found_flag != NULL) { |
| char locked_message_buf[BUFLEN]; |
| found_flag->get_locked_message(locked_message_buf, BUFLEN); |
| if (strlen(locked_message_buf) == 0) { |
| if (found_flag->is_bool() && !has_plus_minus) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Missing +/- setting for VM option '%s'\n", argname); |
| } else if (!found_flag->is_bool() && has_plus_minus) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Unexpected +/- setting in VM option '%s'\n", argname); |
| } else { |
| jio_fprintf(defaultStream::error_stream(), |
| "Improperly specified VM option '%s'\n", argname); |
| } |
| } else { |
| jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); |
| } |
| } else { |
| jio_fprintf(defaultStream::error_stream(), |
| "Unrecognized VM option '%s'\n", argname); |
| Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); |
| if (fuzzy_matched != NULL) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Did you mean '%s%s%s'?\n", |
| (fuzzy_matched->is_bool()) ? "(+/-)" : "", |
| fuzzy_matched->_name, |
| (fuzzy_matched->is_bool()) ? "" : "=<value>"); |
| } |
| } |
| |
| // 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 && pos < (int)(sizeof(token)-1)) { |
| 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, Flag::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, Flag::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, mtInternal); |
| 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, mtInternal); |
| 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.is_altjvm") == 0 || |
| strcmp(key, "sun.java.launcher.pid") == 0) { |
| // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are |
| // private and are 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; |
| |
| // 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; |
| } |
| } |
| |
| #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS |
| // Conflict: required to use shared spaces (-Xshare:on), but |
| // incompatible command line options were chosen. |
| |
| static void no_shared_spaces(const char* message) { |
| 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.", message); |
| } else { |
| FLAG_SET_DEFAULT(UseSharedSpaces, false); |
| } |
| } |
| #endif |
| |
| // Returns threshold scaled with CompileThresholdScaling |
| intx Arguments::get_scaled_compile_threshold(intx threshold) { |
| return (intx)(threshold * CompileThresholdScaling); |
| } |
| |
| // Returns freq_log scaled with CompileThresholdScaling |
| intx Arguments::get_scaled_freq_log(intx freq_log) { |
| intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log); |
| if (scaled_freq == 0) { |
| return 0; |
| } else { |
| return log2_intptr(scaled_freq); |
| } |
| } |
| |
| 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_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5); |
| } |
| // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M |
| if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { |
| FLAG_SET_ERGO(bool, SegmentedCodeCache, true); |
| |
| if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { |
| // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) |
| if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { |
| FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); |
| } |
| if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { |
| FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); |
| } |
| // Check consistency of code heap sizes |
| if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", |
| NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, |
| (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); |
| vm_exit(1); |
| } |
| } |
| } |
| if (!UseInterpreter) { // -Xcomp |
| Tier3InvokeNotifyFreqLog = 0; |
| Tier4InvocationThreshold = 0; |
| } |
| // Scale tiered compilation thresholds |
| if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { |
| FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog)); |
| FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog)); |
| |
| FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold)); |
| FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold)); |
| FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold)); |
| FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold)); |
| |
| // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here |
| // once these thresholds become supported. |
| |
| FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog)); |
| FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog)); |
| |
| FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog)); |
| FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog)); |
| |
| FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog)); |
| |
| FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold)); |
| FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold)); |
| FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold)); |
| FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold)); |
| } |
| } |
| |
| /** |
| * Returns the minimum number of compiler threads needed to run the JVM. The following |
| * configurations are possible. |
| * |
| * 1) The JVM is build using an interpreter only. As a result, the minimum number of |
| * compiler threads is 0. |
| * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As |
| * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. |
| * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, |
| * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only |
| * C1 can be used, so the minimum number of compiler threads is 1. |
| * 4) The JVM is build using the compilers and tiered compilation is enabled. The option |
| * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, |
| * the minimum number of compiler threads is 2. |
| */ |
| int Arguments::get_min_number_of_compiler_threads() { |
| #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) |
| return 0; // case 1 |
| #else |
| if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { |
| return 1; // case 2 or case 3 |
| } |
| return 2; // case 4 (tiered) |
| #endif |
| } |
| |
| #if INCLUDE_ALL_GCS |
| 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); |
| } |
| } |
| |
| 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 (FLAG_IS_DEFAULT(ParallelGCThreads)) { |
| FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); |
| assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); |
| } else if (ParallelGCThreads == 0) { |
| jio_fprintf(defaultStream::error_stream(), |
| "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); |
| vm_exit(1); |
| } |
| |
| // 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); |
| } |
| |
| // 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 by default 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(); |
| } |
| |
| 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(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 |
| 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(NewSize, min_new)); |
| FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, 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(uintx, 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(uintx, SurvivorRatio, MAX2((uintx)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 situation 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", |
| (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); |
| tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); |
| } |
| } |
| #endif // INCLUDE_ALL_GCS |
| |
| 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; |
| |
| #if INCLUDE_ALL_GCS |
| // Set CMS global values |
| CompactibleFreeListSpace::set_cms_values(); |
| #endif // INCLUDE_ALL_GCS |
| } |
| |
| 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 than 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 than page size %d\n", |
| (int)ObjectAlignmentInBytes, os::vm_page_size()); |
| return false; |
| } |
| if(SurvivorAlignmentInBytes == 0) { |
| SurvivorAlignmentInBytes = ObjectAlignmentInBytes; |
| } else { |
| if (!is_power_of_2(SurvivorAlignmentInBytes)) { |
| jio_fprintf(defaultStream::error_stream(), |
| "error: SurvivorAlignmentInBytes=%d must be power of 2\n", |
| (int)SurvivorAlignmentInBytes); |
| return false; |
| } |
| if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { |
| jio_fprintf(defaultStream::error_stream(), |
| "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", |
| (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| size_t Arguments::max_heap_for_compressed_oops() { |
| // Avoid sign flip. |
| assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); |
| // We need to fit both the NULL page and the heap into the memory budget, while |
| // keeping alignment constraints of the heap. To guarantee the latter, as the |
| // NULL page is located before the heap, we pad the NULL page to the conservative |
| // maximum alignment that the GC may ever impose upon the heap. |
| size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), |
| _conservative_max_heap_alignment); |
| |
| LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); |
| 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)", (int) MaxGCPauseMillis); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| void Arguments::set_use_compressed_oops() { |
| #ifndef ZERO |
| #ifdef _LP64 |
| // MaxHeapSize is not set up properly at this point, but |
| // the only value that can override MaxHeapSize if we are |
| // to use UseCompressedOops is InitialHeapSize. |
| size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); |
| |
| if (max_heap_size <= 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); |
| FLAG_SET_DEFAULT(UseCompressedClassPointers, false); |
| } |
| } |
| #endif // _LP64 |
| #endif // ZERO |
| } |
| |
| |
| // NOTE: set_use_compressed_klass_ptrs() must be called after calling |
| // set_use_compressed_oops(). |
| void Arguments::set_use_compressed_klass_ptrs() { |
| #ifndef ZERO |
| #ifdef _LP64 |
| // UseCompressedOops must be on for UseCompressedClassPointers to be on. |
| if (!UseCompressedOops) { |
| if (UseCompressedClassPointers) { |
| warning("UseCompressedClassPointers requires UseCompressedOops"); |
| } |
| FLAG_SET_DEFAULT(UseCompressedClassPointers, false); |
| } else { |
| // Turn on UseCompressedClassPointers too |
| if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { |
| FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); |
| } |
| // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. |
| if (UseCompressedClassPointers) { |
| if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { |
| warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); |
| FLAG_SET_DEFAULT(UseCompressedClassPointers, false); |
| } |
| } |
| } |
| #endif // _LP64 |
| #endif // !ZERO |
| } |
| |
| void Arguments::set_conservative_max_heap_alignment() { |
| // The conservative maximum required alignment for the heap is the maximum of |
| // the alignments imposed by several sources: any requirements from the heap |
| // itself, the collector policy and the maximum page size we may run the VM |
| // with. |
| size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); |
| #if INCLUDE_ALL_GCS |
| if (UseParallelGC) { |
| heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); |
| } else if (UseG1GC) { |
| heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); |
| } |
| #endif // INCLUDE_ALL_GCS |
| _conservative_max_heap_alignment = MAX4(heap_alignment, |
| (size_t)os::vm_allocation_granularity(), |
| os::max_page_size(), |
| CollectorPolicy::compute_heap_alignment()); |
| } |
| |
| void Arguments::select_gc_ergonomically() { |
| if (os::is_server_class_machine()) { |
| if (should_auto_select_low_pause_collector()) { |
| FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); |
| } else { |
| FLAG_SET_ERGO(bool, UseParallelGC, true); |
| } |
| } |
| } |
| |
| void Arguments::select_gc() { |
| if (!gc_selected()) { |
| ArgumentsExt::select_gc_ergonomically(); |
| } |
| } |
| |
| void Arguments::set_ergonomics_flags() { |
| select_gc(); |
| |
| #ifdef COMPILER2 |
| // Shared spaces work fine with other GCs but causes bytecode rewriting |
| // to be disabled, which hurts interpreter performance and decreases |
| // server performance. When -server is specified, keep the default off |
| // unless it is asked for. Future work: either add bytecode rewriting |
| // at link time, or rewrite bytecodes in non-shared methods. |
| if (!DumpSharedSpaces && !RequireSharedSpaces && |
| (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { |
| no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); |
| } |
| #endif |
| |
| set_conservative_max_heap_alignment(); |
| |
| #ifndef ZERO |
| #ifdef _LP64 |
| set_use_compressed_oops(); |
| |
| // set_use_compressed_klass_ptrs() must be called after calling |
| // set_use_compressed_oops(). |
| set_use_compressed_klass_ptrs(); |
| |
| // 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. |
| FLAG_SET_DEFAULT(ParallelGCThreads, |
| Abstract_VM_Version::parallel_worker_threads()); |
| if (ParallelGCThreads == 0) { |
| jio_fprintf(defaultStream::error_stream(), |
| "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); |
| vm_exit(1); |
| } |
| |
| if (UseAdaptiveSizePolicy) { |
| // We don't want to limit adaptive heap sizing's freedom to adjust the heap |
| // unless the user actually sets these flags. |
| if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { |
| FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); |
| _min_heap_free_ratio = MinHeapFreeRatio; |
| } |
| if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { |
| FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); |
| _max_heap_free_ratio = MaxHeapFreeRatio; |
| } |
| } |
| |
| // 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); |
| } |
| } |
| } |
| |
| 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) { |
| assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); |
| vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); |
| } |
| |
| #if INCLUDE_ALL_GCS |
| if (G1ConcRefinementThreads == 0) { |
| FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); |
| } |
| #endif |
| |
| // MarkStackSize will be set (if it hasn't been set by the user) |
| // when concurrent marking is initialized. |
| // Its value will be based upon the number of parallel marking threads. |
| // But we do set the maximum mark stack size here. |
| if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
| FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); |
| } |
| |
| 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); |
| } |
| |
| if (PrintGCDetails && Verbose) { |
| tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", |
| (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); |
| tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); |
| } |
| } |
| |
| #if !INCLUDE_ALL_GCS |
| #ifdef ASSERT |
| static bool verify_serial_gc_flags() { |
| return (UseSerialGC && |
| !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || |
| UseParallelGC || UseParallelOldGC)); |
| } |
| #endif // ASSERT |
| #endif // INCLUDE_ALL_GCS |
| |
| void Arguments::set_gc_specific_flags() { |
| #if INCLUDE_ALL_GCS |
| // 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(); |
| } |
| check_deprecated_gcs(); |
| check_deprecated_gc_flags(); |
| if (AssumeMP && !UseSerialGC) { |
| if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { |
| warning("If the number of processors is expected to increase from one, then" |
| " you should configure the number of parallel GC threads appropriately" |
| " using -XX:ParallelGCThreads=N"); |
| } |
| } |
| if (MinHeapFreeRatio == 100) { |
| // Keeping the heap 100% free is hard ;-) so limit it to 99%. |
| FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); |
| } |
| #else // INCLUDE_ALL_GCS |
| assert(verify_serial_gc_flags(), "SerialGC unset"); |
| #endif // INCLUDE_ALL_GCS |
| } |
| |
| julong Arguments::limit_by_allocatable_memory(julong limit) { |
| julong max_allocatable; |
| julong result = limit; |
| if (os::has_allocatable_memory_limit(&max_allocatable)) { |
| result = MIN2(result, max_allocatable / MaxVirtMemFraction); |
| } |
| return result; |
| } |
| |
| // Use static initialization to get the default before parsing |
| static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; |
| |
| 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(); |
| |
| // HeapBaseMinAddress can be greater than default but not less than. |
| if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { |
| if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { |
| // matches compressed oops printing flags |
| if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { |
| jio_fprintf(defaultStream::error_stream(), |
| "HeapBaseMinAddress must be at least " UINTX_FORMAT |
| " (" UINTX_FORMAT "G) which is greater than value given " |
| UINTX_FORMAT "\n", |
| DefaultHeapBaseMinAddress, |
| DefaultHeapBaseMinAddress/G, |
| HeapBaseMinAddress); |
| } |
| FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); |
| } |
| } |
| |
| 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 = limit_by_allocatable_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 limit_by_allocatable_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, (size_t) reasonable_max); |
| } |
| FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); |
| } |
| |
| // If the minimum or initial heap_size have not been set or requested to be set |
| // ergonomically, set them accordingly. |
| if (InitialHeapSize == 0 || min_heap_size() == 0) { |
| julong reasonable_minimum = (julong)(OldSize + NewSize); |
| |
| reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); |
| |
| reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); |
| |
| if (InitialHeapSize == 0) { |
| julong reasonable_initial = phys_mem / InitialRAMFraction; |
| |
| reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); |
| reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); |
| |
| reasonable_initial = limit_by_allocatable_memory(reasonable_initial); |
| |
| if (PrintGCDetails && Verbose) { |
| // Cannot use gclog_or_tty yet. |
| tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); |
| } |
| FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); |
| } |
| // If the minimum heap size has not been set (via -Xms), |
| // synchronize with InitialHeapSize to avoid errors with the default value. |
| if (min_heap_size() == 0) { |
| set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); |
| if (PrintGCDetails && Verbose) { |
| // Cannot use gclog_or_tty yet. |
| tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); |
| } |
| } |
| } |
| } |
| |
| // 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 (AggressiveUnboxing) { |
| if (FLAG_IS_DEFAULT(EliminateAutoBox)) { |
| FLAG_SET_DEFAULT(EliminateAutoBox, true); |
| } else if (!EliminateAutoBox) { |
| // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); |
| AggressiveUnboxing = false; |
| } |
| if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { |
| FLAG_SET_DEFAULT(DoEscapeAnalysis, true); |
| } else if (!DoEscapeAnalysis) { |
| // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); |
| AggressiveUnboxing = false; |
| } |
| } |
| 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 = os::strdup_check_oom(launcher); |
| } |
| |
| 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::sun_java_launcher_is_altjvm() { |
| return _sun_java_launcher_is_altjvm; |
| } |
| |
| //=========================================================================================================== |
| // 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 (is_percentage(value)) { |
| return true; |
| } |
| jio_fprintf(defaultStream::error_stream(), |
| "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", |
| name, value); |
| return false; |
| } |
| |
| // check if do gclog rotation |
| // +UseGCLogFileRotation is a must, |
| // no gc log rotation when log file not supplied or |
| // NumberOfGCLogFiles is 0 |
| void check_gclog_consistency() { |
| if (UseGCLogFileRotation) { |
| if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { |
| jio_fprintf(defaultStream::output_stream(), |
| "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" |
| "where num_of_file > 0\n" |
| "GC log rotation is turned off\n"); |
| UseGCLogFileRotation = false; |
| } |
| } |
| |
| if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { |
| FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); |
| jio_fprintf(defaultStream::output_stream(), |
| "GCLogFileSize changed to minimum 8K\n"); |
| } |
| } |
| |
| // This function is called for -Xloggc:<filename>, it can be used |
| // to check if a given file name(or string) conforms to the following |
| // specification: |
| // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" |
| // %p and %t only allowed once. We only limit usage of filename not path |
| bool is_filename_valid(const char *file_name) { |
| const char* p = file_name; |
| char file_sep = os::file_separator()[0]; |
| const char* cp; |
| // skip prefix path |
| for (cp = file_name; *cp != '\0'; cp++) { |
| if (*cp == '/' || *cp == file_sep) { |
| p = cp + 1; |
| } |
| } |
| |
| int count_p = 0; |
| int count_t = 0; |
| while (*p != '\0') { |
| if ((*p >= '0' && *p <= '9') || |
| (*p >= 'A' && *p <= 'Z') || |
| (*p >= 'a' && *p <= 'z') || |
| *p == '-' || |
| *p == '_' || |
| *p == '.') { |
| p++; |
| continue; |
| } |
| if (*p == '%') { |
| if(*(p + 1) == 'p') { |
| p += 2; |
| count_p ++; |
| continue; |
| } |
| if (*(p + 1) == 't') { |
| p += 2; |
| count_t ++; |
| continue; |
| } |
| } |
| return false; |
| } |
| return count_p < 2 && count_t < 2; |
| } |
| |
| bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { |
| if (!is_percentage(min_heap_free_ratio)) { |
| err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); |
| return false; |
| } |
| if (min_heap_free_ratio > MaxHeapFreeRatio) { |
| err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " |
| "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, |
| MaxHeapFreeRatio); |
| return false; |
| } |
| // This does not set the flag itself, but stores the value in a safe place for later usage. |
| _min_heap_free_ratio = min_heap_free_ratio; |
| return true; |
| } |
| |
| bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { |
| if (!is_percentage(max_heap_free_ratio)) { |
| err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); |
| return false; |
| } |
| if (max_heap_free_ratio < MinHeapFreeRatio) { |
| err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " |
| "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, |
| MinHeapFreeRatio); |
| return false; |
| } |
| // This does not set the flag itself, but stores the value in a safe place for later usage. |
| _max_heap_free_ratio = max_heap_free_ratio; |
| return true; |
| } |
| |
| // Check consistency of GC selection |
| bool Arguments::check_gc_consistency_user() { |
| 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; |
| } |
| |
| void Arguments::check_deprecated_gcs() { |
| if (UseConcMarkSweepGC && !UseParNewGC) { |
| warning("Using the DefNew young collector with the CMS collector is deprecated " |
| "and will likely be removed in a future release"); |
| } |
| |
| if (UseParNewGC && !UseConcMarkSweepGC) { |
| // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't |
| // set up UseSerialGC properly, so that can't be used in the check here. |
| warning("Using the ParNew young collector with the Serial old collector is deprecated " |
| "and will likely be removed in a future release"); |
| } |
| |
| if (CMSIncrementalMode) { |
| warning("Using incremental CMS is deprecated and will likely be removed in a future release"); |
| } |
| } |
| |
| void Arguments::check_deprecated_gc_flags() { |
| if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { |
| warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" |
| "and will likely be removed in future release"); |
| } |
| if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { |
| warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " |
| "Use MaxRAMFraction instead."); |
| } |
| if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { |
| warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); |
| } |
| if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { |
| warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); |
| } |
| if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { |
| warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); |
| } |
| } |
| |
| // 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 (TLABRefillWasteFraction == 0) { |
| jio_fprintf(defaultStream::error_stream(), |
| "TLABRefillWasteFraction should be a denominator, " |
| "not " SIZE_FORMAT "\n", |
| TLABRefillWasteFraction); |
| status = false; |
| } |
| |
| status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, |
| "AdaptiveSizePolicyWeight"); |
| status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); |
| |
| // Divide by bucket size to prevent a large size from causing rollover when |
| // calculating amount of memory needed to be allocated for the String table. |
| status = status && verify_interval(StringTableSize, minimumStringTableSize, |
| (max_uintx / StringTable::bucket_size()), "StringTable size"); |
| |
| status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, |
| (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); |
| |
| { |
| // Using "else if" below to avoid printing two error messages if min > max. |
| // This will also prevent us from reporting both min>100 and max>100 at the |
| // same time, but that is less annoying than printing two identical errors IMHO. |
| FormatBuffer<80> err_msg("%s",""); |
| if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { |
| jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); |
| status = false; |
| } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { |
| jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); |
| status = false; |
| } |
| } |
| |
| // Min/MaxMetaspaceFreeRatio |
| status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); |
| status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); |
| |
| if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { |
| jio_fprintf(defaultStream::error_stream(), |
| "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " |
| "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", |
| FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", |
| MinMetaspaceFreeRatio, |
| FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", |
| MaxMetaspaceFreeRatio); |
| status = false; |
| } |
| |
| // Trying to keep 100% free is not practical |
| MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (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(uintx, NewRatio, 2); |
| } |
| if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { |
| FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); |
| } |
| } |
| |
| if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { |
| FLAG_SET_DEFAULT(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 && ArgumentsExt::check_gc_consistency_user(); |
| status = status && check_stack_pages(); |
| |
| 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 (VerifyDuringStartup) { |
| warning("Heap verification at start-up disabled " |
| "(due to current incompatibility with FLSVerifyAllHeapReferences)"); |
| VerifyDuringStartup = false; // 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: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" |
| " with -UseAsyncConcMarkSweepGC"); |
| status = false; |
| } |
| |
| status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); |
| |
| #if INCLUDE_ALL_GCS |
| if (UseG1GC) { |
| status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); |
| status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); |
| status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); |
| |
| status = status && verify_percentage(InitiatingHeapOccupancyPercent, |
| "InitiatingHeapOccupancyPercent"); |
| status = status && verify_min_value(G1RefProcDrainInterval, 1, |
| "G1RefProcDrainInterval"); |
| status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, |
| "G1ConcMarkStepDurationMillis"); |
| status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, |
| "G1ConcRSHotCardLimit"); |
| status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, |
| "G1ConcRSLogCacheSize"); |
| status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, |
| "StringDeduplicationAgeThreshold"); |
| } |
| if (UseConcMarkSweepGC) { |
| status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); |
| status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); |
| status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); |
| status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); |
| |
| status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); |
| |
| status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); |
| status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); |
| status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); |
| |
| status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); |
| |
| status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); |
| status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); |
| |
| status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); |
| status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); |
| status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); |
| |
| status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); |
| |
| status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); |
| |
| status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); |
| status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); |
| status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); |
| status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); |
| status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); |
| } |
| |
| if (UseParallelGC || UseParallelOldGC) { |
| status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); |
| status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); |
| |
| status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); |
| status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); |
| |
| status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); |
| status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); |
| |
| status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); |
| |
| status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); |
| } |
| #endif // INCLUDE_ALL_GCS |
| |
| 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(); |
| |
| status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, |
| "CompressedClassSpaceSize"); |
| |
| status = status && verify_interval(MarkStackSizeMax, |
| 1, (max_jint - 1), "MarkStackSizeMax"); |
| status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); |
| |
| status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); |
| |
| status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); |
| |
| status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); |
| |
| status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); |
| status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); |
| |
| status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); |
| |
| status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); |
| status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); |
| status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); |
| status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); |
| |
| status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); |
| status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); |
| |
| status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); |
| status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); |
| status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); |
| |
| status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); |
| status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); |
| |
| status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); |
| status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); |
| status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); |
| status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); |
| |
| status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); |
| #ifdef COMPILER1 |
| status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); |
| #endif |
| |
| if (PrintNMTStatistics) { |
| #if INCLUDE_NMT |
| if (MemTracker::tracking_level() == NMT_off) { |
| #endif // INCLUDE_NMT |
| warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); |
| PrintNMTStatistics = false; |
| #if INCLUDE_NMT |
| } |
| #endif |
| } |
| |
| // Need to limit the extent of the padding to reasonable size. |
| // 8K is well beyond the reasonable HW cache line size, even with the |
| // aggressive prefetching, while still leaving the room for segregating |
| // among the distinct pages. |
| if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { |
| jio_fprintf(defaultStream::error_stream(), |
| "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", |
| ContendedPaddingWidth, 0, 8192); |
| status = false; |
| } |
| |
| // Need to enforce the padding not to break the existing field alignments. |
| // It is sufficient to check against the largest type size. |
| if ((ContendedPaddingWidth % BytesPerLong) != 0) { |
| jio_fprintf(defaultStream::error_stream(), |
| "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", |
| ContendedPaddingWidth, BytesPerLong); |
| status = false; |
| } |
| |
| // Check lower bounds of the code cache |
| // Template Interpreter code is approximately 3X larger in debug builds. |
| uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; |
| if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, |
| os::vm_page_size()/K); |
| status = false; |
| } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", |
| ReservedCodeCacheSize/K, InitialCodeCacheSize/K); |
| status = false; |
| } else if (ReservedCodeCacheSize < min_code_cache_size) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, |
| min_code_cache_size/K); |
| status = false; |
| } else if (ReservedCodeCacheSize > 2*G) { |
| // Code cache size larger than MAXINT is not supported. |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, |
| (2*G)/M); |
| status = false; |
| } else if (NonNMethodCodeHeapSize < min_code_cache_size){ |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, |
| min_code_cache_size/K); |
| status = false; |
| } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) |
| && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", |
| NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, |
| (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); |
| status = false; |
| } |
| |
| status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); |
| status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); |
| status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); |
| status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); |
| |
| int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); |
| // The default CICompilerCount's value is CI_COMPILER_COUNT. |
| assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); |
| // Check the minimum number of compiler threads |
| status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); |
| |
| if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { |
| warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); |
| } |
| |
| 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, Flag::COMMAND_LINE); |
| if (result != JNI_OK) { |
| return result; |
| } |
| |
| // 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; |
| } |
| |
| // Checks if name in command-line argument -agent{lib,path}:name[=options] |
| // represents a valid HPROF of JDWP agent. is_path==true denotes that we |
| // are dealing with -agentpath (case where name is a path), otherwise with |
| // -agentlib |
| bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { |
| char *_name; |
| const char *_hprof = "hprof", *_jdwp = "jdwp"; |
| size_t _len_hprof, _len_jdwp, _len_prefix; |
| |
| if (is_path) { |
| if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { |
| return false; |
| } |
| |
| _name++; // skip past last path separator |
| _len_prefix = strlen(JNI_LIB_PREFIX); |
| |
| if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { |
| return false; |
| } |
| |
| _name += _len_prefix; |
| _len_hprof = strlen(_hprof); |
| _len_jdwp = strlen(_jdwp); |
| |
| if (strncmp(_name, _hprof, _len_hprof) == 0) { |
| _name += _len_hprof; |
| } |
| else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { |
| _name += _len_jdwp; |
| } |
| else { |
| return false; |
| } |
| |
| if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, |
| SysClassPath* scp_p, |
| bool* scp_assembly_required_p, |
| Flag::Flags 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, mtInternal), 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, mtInternal), pos+1, len2); |
| } |
| #if !INCLUDE_JVMTI |
| if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Profiling and debugging agents are not supported in this VM\n"); |
| return JNI_ERR; |
| } |
| #endif // !INCLUDE_JVMTI |
| 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, mtInternal), tail, len); |
| name[len] = '\0'; |
| |
| char *options = NULL; |
| if(pos != NULL) { |
| options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); |
| } |
| #if !INCLUDE_JVMTI |
| if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Profiling and debugging agents are not supported in this VM\n"); |
| return JNI_ERR; |
| } |
| #endif // !INCLUDE_JVMTI |
| add_init_agent(name, options, is_absolute_path); |
| } |
| // -javaagent |
| } else if (match_option(option, "-javaagent:", &tail)) { |
| #if !INCLUDE_JVMTI |
| jio_fprintf(defaultStream::error_stream(), |
| "Instrumentation agents are not supported in this VM\n"); |
| return JNI_ERR; |
| #else |
| if(tail != NULL) { |
| char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); |
| add_init_agent("instrument", options, false); |
| } |
| #endif // !INCLUDE_JVMTI |
| // -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_young_size = 0; |
| ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); |
| if (errcode != arg_in_range) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid initial young generation size: %s\n", option->optionString); |
| describe_range_error(errcode); |
| return JNI_EINVAL; |
| } |
| FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); |
| FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); |
| // -Xms |
| } else if (match_option(option, "-Xms", &tail)) { |
| julong long_initial_heap_size = 0; |
| // an initial heap size of 0 means automatically determine |
| ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); |
| 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; |
| } |
| set_min_heap_size((uintx)long_initial_heap_size); |
| // Currently the minimum size and the initial heap sizes are the same. |
| // Can be overridden with -XX:InitialHeapSize. |
| FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); |
| // -Xmx |
| } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &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)) { |
| char* err; |
| int maxf = (int)(strtod(tail, &err) * 100); |
| if (*err != '\0' || *tail == '\0' || 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)) { |
| char* err; |
| int minf = (int)(strtod(tail, &err) * 100); |
| if (*err != '\0' || *tail == '\0' || 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 |
| } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { |
| julong long_CodeCacheExpansionSize = 0; |
| ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); |
| if (errcode != arg_in_range) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid argument: %s. Must be at least %luK.\n", option->optionString, |
| os::vm_page_size()/K); |
| return JNI_EINVAL; |
| } |
| FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); |
| } 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, 1); |
| if (errcode != arg_in_range) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid maximum code cache size: %s.\n", option->optionString); |
| return JNI_EINVAL; |
| } |
| FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); |
| // -XX:NonNMethodCodeHeapSize= |
| } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { |
| julong long_NonNMethodCodeHeapSize = 0; |
| |
| ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); |
| if (errcode != arg_in_range) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); |
| return JNI_EINVAL; |
| } |
| FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); |
| // -XX:ProfiledCodeHeapSize= |
| } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { |
| julong long_ProfiledCodeHeapSize = 0; |
| |
| ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); |
| if (errcode != arg_in_range) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid maximum profiled code heap size: %s.\n", option->optionString); |
| return JNI_EINVAL; |
| } |
| FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); |
| // -XX:NonProfiledCodeHeapSizee= |
| } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { |
| julong long_NonProfiledCodeHeapSize = 0; |
| |
| ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); |
| if (errcode != arg_in_range) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); |
| return JNI_EINVAL; |
| } |
| FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); |
| //-XX:IncreaseFirstTierCompileThresholdAt= |
| } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { |
| uintx uint_IncreaseFirstTierCompileThresholdAt = 0; |
| if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", |
| option->optionString); |
| return JNI_EINVAL; |
| } |
| FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); |
| // -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)) { |
| #if INCLUDE_FPROF |
| _has_profile = true; |
| #else // INCLUDE_FPROF |
| jio_fprintf(defaultStream::error_stream(), |
| "Flat profiling is not supported in this VM.\n"); |
| return JNI_ERR; |
| #endif // INCLUDE_FPROF |
| // -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)) { |
| #if INCLUDE_MANAGEMENT |
| FLAG_SET_CMDLINE(bool, ManagementServer, true); |
| #else |
| jio_fprintf(defaultStream::output_stream(), |
| "-Dcom.sun.management is not supported in this VM.\n"); |
| return JNI_ERR; |
| #endif |
| } |
| // -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)) { |
| FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); |
| set_mode_flags(_int); // Prevent compilation, which creates objects |
| // -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 = os::strdup_check_oom(tail); |
| if (!is_filename_valid(_gc_log_filename)) { |
| jio_fprintf(defaultStream::output_stream(), |
| "Invalid file name for use with -Xloggc: Filename can only contain the " |
| "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" |
| "Note %%p or %%t can only be used once\n", _gc_log_filename); |
| return JNI_EINVAL; |
| } |
| 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")) { |
| #if !INCLUDE_JNI_CHECK |
| warning("JNI CHECKING is not supported in this VM"); |
| #else |
| CheckJNICalls = true; |
| #endif // INCLUDE_JNI_CHECK |
| } 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); |
| |
| initHeapSize = limit_by_allocatable_memory(initHeapSize); |
| |
| 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); |
| } |
| |
| #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. |
| FLAG_SET_DEFAULT(UseLargePages, true); |
| #endif |
| |
| // 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); |
| |
| // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; |
| // and the last option wins. |
| } else if (match_option(option, "-XX:+NeverTenure", &tail)) { |
| FLAG_SET_CMDLINE(bool, NeverTenure, true); |
| FLAG_SET_CMDLINE(bool, AlwaysTenure, false); |
| FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); |
| } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { |
| FLAG_SET_CMDLINE(bool, NeverTenure, false); |
| FLAG_SET_CMDLINE(bool, AlwaysTenure, true); |
| FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); |
| } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { |
| uintx max_tenuring_thresh = 0; |
| if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid MaxTenuringThreshold: %s\n", option->optionString); |
| } |
| FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); |
| |
| if (MaxTenuringThreshold == 0) { |
| FLAG_SET_CMDLINE(bool, NeverTenure, false); |
| FLAG_SET_CMDLINE(bool, AlwaysTenure, true); |
| } else { |
| FLAG_SET_CMDLINE(bool, NeverTenure, false); |
| FLAG_SET_CMDLINE(bool, AlwaysTenure, false); |
| } |
| } 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); |
| } 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:MaxDirectMemorySize=", &tail)) { |
| julong max_direct_memory_size = 0; |
| ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); |
| if (errcode != arg_in_range) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Invalid maximum direct memory size: %s\n", |
| option->optionString); |
| describe_range_error(errcode); |
| return JNI_EINVAL; |
| } |
| FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); |
| #if !INCLUDE_MANAGEMENT |
| } else if (match_option(option, "-XX:+ManagementServer", &tail)) { |
| jio_fprintf(defaultStream::error_stream(), |
| "ManagementServer is not supported in this VM.\n"); |
| return JNI_ERR; |
| #endif // INCLUDE_MANAGEMENT |
| } 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; |
| } |
| } |
| |
| // PrintSharedArchiveAndExit will turn on |
| // -Xshare:on |
| // -XX:+TraceClassPaths |
| if (PrintSharedArchiveAndExit) { |
| FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); |
| FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); |
| FLAG_SET_CMDLINE(bool, TraceClassPaths, true); |
| } |
| |
| // Change the default value for flags which have different default values |
| // when working with older JDKs. |
| #ifdef LINUX |
| if (JDK_Version::current().compare_major(6) <= 0 && |
| FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { |
| FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); |
| } |
| #endif // LINUX |
| fix_appclasspath(); |
| return JNI_OK; |
| } |
| |
| // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) |
| // |
| // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar |
| // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". |
| // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty |
| // path is treated as the current directory. |
| // |
| // This causes problems with CDS, which requires that all directories specified in the classpath |
| // must be empty. In most cases, applications do NOT want to load classes from the current |
| // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up |
| // scripts compatible with CDS. |
| void Arguments::fix_appclasspath() { |
| if (IgnoreEmptyClassPaths) { |
| const char separator = *os::path_separator(); |
| const char* src = _java_class_path->value(); |
| |
| // skip over all the leading empty paths |
| while (*src == separator) { |
| src ++; |
| } |
| |
| char* copy = AllocateHeap(strlen(src) + 1, mtInternal); |
| strncpy(copy, src, strlen(src) + 1); |
| |
| // trim all trailing empty paths |
| for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { |
| *tail = '\0'; |
| } |
| |
| char from[3] = {separator, separator, '\0'}; |
| char to [2] = {separator, '\0'}; |
| while (StringUtils::replace_no_expand(copy, from, to) > 0) { |
| // Keep replacing "::" -> ":" until we have no more "::" (non-windows) |
| // Keep replacing ";;" -> ";" until we have no more ";;" (windows) |
| } |
| |
| _java_class_path->set_value(copy); |
| FreeHeap(copy); // a copy was made by set_value, so don't need this anymore |
| } |
| |
| if (!PrintSharedArchiveAndExit) { |
| ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); |
| } |
| } |
| |
| 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 ((TieredCompilation && CompileThresholdScaling == 0) |
| || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) { |
| set_mode_flags(_int); |
| } |
| |
| // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set |
| if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { |
| FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); |
| } |
| |
| #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); |
| } |
| |
| #else |
| if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { |
| FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); |
| } |
| #endif |
| |
| #ifndef TIERED |
| // Tiered compilation is undefined. |
| UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); |
| #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 (!ArgumentsExt::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, Flag::ENVIRON_VAR)); |
| } |
| return JNI_OK; |
| } |
| |
| void Arguments::set_shared_spaces_flags() { |
| if (DumpSharedSpaces) { |
| if (RequireSharedSpaces) { |
| warning("cannot dump shared archive while using shared archive"); |
| } |
| UseSharedSpaces = false; |
| #ifdef _LP64 |
| if (!UseCompressedOops || !UseCompressedClassPointers) { |
| vm_exit_during_initialization( |
| "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); |
| } |
| } else { |
| if (!UseCompressedOops || !UseCompressedClassPointers) { |
| no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); |
| } |
| #endif |
| } |
| } |
| |
| #if !INCLUDE_ALL_GCS |
| static void force_serial_gc() { |
| FLAG_SET_DEFAULT(UseSerialGC, true); |
| FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption |
| UNSUPPORTED_GC_OPTION(UseG1GC); |
| UNSUPPORTED_GC_OPTION(UseParallelGC); |
| UNSUPPORTED_GC_OPTION(UseParallelOldGC); |
| UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); |
| UNSUPPORTED_GC_OPTION(UseParNewGC); |
| } |
| #endif // INCLUDE_ALL_GCS |
| |
| // Sharing support |
| // Construct the path to the archive |
| static char* get_shared_archive_path() { |
| char *shared_archive_path; |
| if (SharedArchiveFile == NULL) { |
| 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'; |
| size_t jvm_path_len = strlen(jvm_path); |
| size_t file_sep_len = strlen(os::file_separator()); |
| shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + |
| file_sep_len + 20, mtInternal); |
| if (shared_archive_path != NULL) { |
| strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); |
| strncat(shared_archive_path, os::file_separator(), file_sep_len); |
| strncat(shared_archive_path, "classes.jsa", 11); |
| } |
| } else { |
| shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); |
| if (shared_archive_path != NULL) { |
| strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); |
| } |
| } |
| return shared_archive_path; |
| } |
| |
| #ifndef PRODUCT |
| // Determine whether LogVMOutput should be implicitly turned on. |
| static bool use_vm_log() { |
| if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || |
| PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || |
| PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || |
| PrintAssembly || TraceDeoptimization || TraceDependencies || |
| (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { |
| return true; |
| } |
| |
| #ifdef COMPILER1 |
| if (PrintC1Statistics) { |
| return true; |
| } |
| #endif // COMPILER1 |
| |
| #ifdef COMPILER2 |
| if (PrintOptoAssembly || PrintOptoStatistics) { |
| return true; |
| } |
| #endif // COMPILER2 |
| |
| return false; |
| } |
| #endif // PRODUCT |
| |
| // Parse entry point called from JNI_CreateJavaVM |
| |
| jint Arguments::parse(const JavaVMInitArgs* args) { |
| |
| // 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. |
| const char* hotspotrc = ".hotspotrc"; |
| bool settings_file_specified = false; |
| bool needs_hotspotrc_warning = false; |
| |
| const char* flags_file; |
| int index; |
| for (index = 0; index < args->nOptions; index++) { |
| const JavaVMOption *option = args->options + index; |
| if (ArgumentsExt::process_options(option)) { |
| continue; |
| } |
| if (match_option(option, "-XX:Flags=", &tail)) { |
| flags_file = tail; |
| settings_file_specified = true; |
| continue; |
| } |
| if (match_option(option, "-XX:+PrintVMOptions", &tail)) { |
| PrintVMOptions = true; |
| continue; |
| } |
| if (match_option(option, "-XX:-PrintVMOptions", &tail)) { |
| PrintVMOptions = false; |
| continue; |
| } |
| if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { |
| IgnoreUnrecognizedVMOptions = true; |
| continue; |
| } |
| if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { |
| IgnoreUnrecognizedVMOptions = false; |
| continue; |
| } |
| if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { |
| CommandLineFlags::printFlags(tty, false); |
| vm_exit(0); |
| } |
| #if INCLUDE_NMT |
| if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { |
| // The launcher did not setup nmt environment variable properly. |
| if (!MemTracker::check_launcher_nmt_support(tail)) { |
| warning("Native Memory Tracking did not setup properly, using wrong launcher?"); |
| } |
| |
| // Verify if nmt option is valid. |
| if (MemTracker::verify_nmt_option()) { |
| // Late initialization, still in single-threaded mode. |
| if (MemTracker::tracking_level() >= NMT_summary) { |
| MemTracker::init(); |
| } |
| } else { |
| vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); |
| } |
| continue; |
| } |
| #endif |
| |
| |
| #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; |
| } |
| } else { |
| #ifdef ASSERT |
| // Parse default .hotspotrc settings file |
| if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { |
| return JNI_EINVAL; |
| } |
| #else |
| struct stat buf; |
| if (os::stat(hotspotrc, &buf) == 0) { |
| needs_hotspotrc_warning = true; |
| } |
| #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; |
| } |
| |
| // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. |
| SharedArchivePath = get_shared_archive_path(); |
| if (SharedArchivePath == NULL) { |
| return JNI_ENOMEM; |
| } |
| |
| // Set up VerifySharedSpaces |
| if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { |
| VerifySharedSpaces = true; |
| } |
| |
| // Delay warning until here so that we've had a chance to process |
| // the -XX:-PrintWarnings flag |
| if (needs_hotspotrc_warning) { |
| warning("%s file is present but has been ignored. " |
| "Run with -XX:Flags=%s to load the file.", |
| hotspotrc, hotspotrc); |
| } |
| |
| #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. |
| UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); |
| #endif |
| |
| #if INCLUDE_ALL_GCS |
| #if (defined JAVASE_EMBEDDED || defined ARM) |
| UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); |
| #endif |
| #endif |
| |
| #ifndef PRODUCT |
| if (TraceBytecodesAt != 0) { |
| TraceBytecodes = true; |
| } |
| if (CountCompiledCalls) { |
| if (UseCounterDecay) { |
| warning("UseCounterDecay disabled because CountCalls is set"); |
| UseCounterDecay = false; |
| } |
| } |
| #endif // PRODUCT |
| |
| if (ScavengeRootsInCode == 0) { |
| if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { |
| warning("forcing ScavengeRootsInCode non-zero"); |
| } |
| ScavengeRootsInCode = 1; |
| } |
| |
| if (PrintGCDetails) { |
| // Turn on -verbose:gc options as well |
| PrintGC = true; |
| } |
| |
| // Set object alignment values. |
| set_object_alignment(); |
| |
| #if !INCLUDE_ALL_GCS |
| force_serial_gc(); |
| #endif // INCLUDE_ALL_GCS |
| #if !INCLUDE_CDS |
| if (DumpSharedSpaces || RequireSharedSpaces) { |
| jio_fprintf(defaultStream::error_stream(), |
| "Shared spaces are not supported in this VM\n"); |
| return JNI_ERR; |
| } |
| if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { |
| warning("Shared spaces are not supported in this VM"); |
| FLAG_SET_DEFAULT(UseSharedSpaces, false); |
| FLAG_SET_DEFAULT(PrintSharedSpaces, false); |
| } |
| no_shared_spaces("CDS Disabled"); |
| #endif // INCLUDE_CDS |
| |
| return JNI_OK; |
| } |
| |
| jint Arguments::apply_ergo() { |
| |
| // Set flags based on ergonomics. |
| set_ergonomics_flags(); |
| |
| set_shared_spaces_flags(); |
| |
| // Check the GC selections again. |
| if (!ArgumentsExt::check_gc_consistency_ergo()) { |
| 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); |
| } |
| // Scale CompileThreshold |
| if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { |
| FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold)); |
| } |
| } |
| |
| #ifdef COMPILER2 |
| #ifndef PRODUCT |
| if (PrintIdealGraphLevel > 0) { |
| FLAG_SET_ERGO(bool, PrintIdealGraph, true); |
| } |
| #endif |
| #endif |
| |
| // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) |
| if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { |
| FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); |
| } |
| |
| |
| // Set heap size based on available physical memory |
| set_heap_size(); |
| |
| set_gc_specific_flags(); |
| |
| // Initialize Metaspace flags and alignments |
| Metaspace::ergo_initialize(); |
| |
| // 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 subtly 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 ZERO |
| // Clear flags not supported on zero. |
| FLAG_SET_DEFAULT(ProfileInterpreter, false); |
| FLAG_SET_DEFAULT(UseBiasedLocking, false); |
| LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); |
| LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); |
| #endif // CC_INTERP |
| |
| #ifdef COMPILER2 |
| if (!EliminateLocks) { |
| EliminateNestedLocks = false; |
| } |
| if (!Inline) { |
| IncrementalInline = false; |
| } |
| #ifndef PRODUCT |
| if (!IncrementalInline) { |
| AlwaysIncrementalInline = false; |
| } |
| #endif |
| if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { |
| // nothing to use the profiling, turn if off |
| FLAG_SET_DEFAULT(TypeProfileLevel, 0); |
| } |
| #endif |
| |
| if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { |
| warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); |
| DebugNonSafepoints = true; |
| } |
| |
| if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { |
| warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); |
| } |
| |
| #ifndef PRODUCT |
| if (CompileTheWorld) { |
| // Force NmethodSweeper to sweep whole CodeCache each time. |
| if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { |
| NmethodSweepFraction = 1; |
| } |
| } |
| |
| if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { |
| if (use_vm_log()) { |
| LogVMOutput = true; |
| } |
| } |
| #endif // PRODUCT |
| |
| 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; |
| } |
| } |
| #ifdef COMPILER2 |
| if (!UseBiasedLocking || EmitSync != 0) { |
| UseOptoBiasInlining = false; |
| } |
| #endif |
| |
| return JNI_OK; |
| } |
| |
| jint Arguments::adjust_after_os() { |
| if (UseNUMA) { |
| if (UseParallelGC || UseParallelOldGC) { |
| if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { |
| FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); |
| } |
| } |
| // UseNUMAInterleaving is set to ON for all collectors and |
| // platforms when UseNUMA is set to ON. NUMA-aware collectors |
| // such as the parallel collector for Linux and Solaris will |
| // interleave old gen and survivor spaces on top of NUMA |
| // allocation policy for the eden space. |
| // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on |
| // all platforms and ParallelGC on Windows will interleave all |
| // of the heap spaces across NUMA nodes. |
| if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { |
| FLAG_SET_ERGO(bool, UseNUMAInterleaving, 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); |
| } |
| |
| // 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 |
| } |