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arguments.cpp 
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/*
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 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "cds/cds_globals.hpp"
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#include "cds/cdsConfig.hpp"
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#include "cds/filemap.hpp"
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#include "classfile/classLoader.hpp"
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#include "classfile/javaAssertions.hpp"
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#include "classfile/moduleEntry.hpp"
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#include "classfile/stringTable.hpp"
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#include "classfile/symbolTable.hpp"
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#include "compiler/compilerDefinitions.hpp"
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#include "gc/shared/gcArguments.hpp"
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#include "gc/shared/gcConfig.hpp"
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#include "gc/shared/genArguments.hpp"
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#include "gc/shared/stringdedup/stringDedup.hpp"
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#include "gc/shared/tlab_globals.hpp"
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#include "jvm.h"
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#include "logging/log.hpp"
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#include "logging/logConfiguration.hpp"
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#include "logging/logStream.hpp"
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#include "logging/logTag.hpp"
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#include "memory/allocation.inline.hpp"
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#include "nmt/nmtCommon.hpp"
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#include "oops/compressedKlass.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/oop.inline.hpp"
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#include "prims/jvmtiAgentList.hpp"
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#include "prims/jvmtiExport.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/flags/jvmFlag.hpp"
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#include "runtime/flags/jvmFlagAccess.hpp"
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#include "runtime/flags/jvmFlagLimit.hpp"
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#include "runtime/globals_extension.hpp"
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#include "runtime/java.hpp"
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#include "runtime/os.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/safepointMechanism.hpp"
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#include "runtime/synchronizer.hpp"
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#include "runtime/vm_version.hpp"
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#include "services/management.hpp"
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#include "utilities/align.hpp"
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#include "utilities/checkedCast.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/defaultStream.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/parseInteger.hpp"
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#include "utilities/powerOfTwo.hpp"
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#include "utilities/stringUtils.hpp"
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#include "utilities/systemMemoryBarrier.hpp"
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#if INCLUDE_JFR
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#include "jfr/jfr.hpp"
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#endif
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#include <limits>
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static const char _default_java_launcher[] = "generic";
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#define DEFAULT_JAVA_LAUNCHER _default_java_launcher
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char*  Arguments::_jvm_flags_file               = nullptr;
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char** Arguments::_jvm_flags_array              = nullptr;
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int    Arguments::_num_jvm_flags                = 0;
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char** Arguments::_jvm_args_array               = nullptr;
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int    Arguments::_num_jvm_args                 = 0;
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char*  Arguments::_java_command                 = nullptr;
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SystemProperty* Arguments::_system_properties   = nullptr;
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size_t Arguments::_conservative_max_heap_alignment = 0;
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Arguments::Mode Arguments::_mode                = _mixed;
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const char*  Arguments::_java_vendor_url_bug    = nullptr;
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const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
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bool   Arguments::_sun_java_launcher_is_altjvm  = false;
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// These parameters are reset in method parse_vm_init_args()
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bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
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bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
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bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
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bool   Arguments::_ClipInlining                 = ClipInlining;
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size_t Arguments::_default_SharedBaseAddress    = SharedBaseAddress;
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bool   Arguments::_enable_preview               = false;
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LegacyGCLogging Arguments::_legacyGCLogging     = { nullptr, 0 };
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// These are not set by the JDK's built-in launchers, but they can be set by
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// programs that embed the JVM using JNI_CreateJavaVM. See comments around
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// JavaVMOption in jni.h.
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abort_hook_t     Arguments::_abort_hook         = nullptr;
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exit_hook_t      Arguments::_exit_hook          = nullptr;
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vfprintf_hook_t  Arguments::_vfprintf_hook      = nullptr;
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SystemProperty *Arguments::_sun_boot_library_path = nullptr;
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SystemProperty *Arguments::_java_library_path = nullptr;
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SystemProperty *Arguments::_java_home = nullptr;
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SystemProperty *Arguments::_java_class_path = nullptr;
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SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
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SystemProperty *Arguments::_vm_info = nullptr;
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GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
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PathString *Arguments::_boot_class_path = nullptr;
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bool Arguments::_has_jimage = false;
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char* Arguments::_ext_dirs = nullptr;
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// True if -Xshare:auto option was specified.
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static bool xshare_auto_cmd_line = false;
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// True if -Xint/-Xmixed/-Xcomp were specified
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static bool mode_flag_cmd_line = false;
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bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
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  char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
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  if (new_value == nullptr) {
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    assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
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    return false;
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  }
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  if (_value != nullptr) {
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    FreeHeap(_value);
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  }
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  _value = new_value;
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  strcpy(_value, value);
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  return true;
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}
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void PathString::append_value(const char *value) {
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  char *sp;
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  size_t len = 0;
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  if (value != nullptr) {
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    len = strlen(value);
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    if (_value != nullptr) {
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      len += strlen(_value);
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    }
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    sp = AllocateHeap(len+2, mtArguments);
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    assert(sp != nullptr, "Unable to allocate space for new append path value");
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    if (sp != nullptr) {
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      if (_value != nullptr) {
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        strcpy(sp, _value);
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        strcat(sp, os::path_separator());
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        strcat(sp, value);
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        FreeHeap(_value);
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      } else {
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        strcpy(sp, value);
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      }
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      _value = sp;
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    }
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  }
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}
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PathString::PathString(const char* value) {
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  if (value == nullptr) {
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    _value = nullptr;
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  } else {
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    _value = AllocateHeap(strlen(value)+1, mtArguments);
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    strcpy(_value, value);
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  }
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}
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PathString::~PathString() {
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  if (_value != nullptr) {
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    FreeHeap(_value);
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    _value = nullptr;
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  }
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}
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ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
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  assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
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  size_t len = strlen(module_name) + 1;
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  _module_name = AllocateHeap(len, mtInternal);
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  strncpy(_module_name, module_name, len); // copy the trailing null
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  _path =  new PathString(path);
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}
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ModulePatchPath::~ModulePatchPath() {
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  if (_module_name != nullptr) {
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    FreeHeap(_module_name);
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    _module_name = nullptr;
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  }
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  if (_path != nullptr) {
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    delete _path;
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    _path = nullptr;
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  }
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}
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SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
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  if (key == nullptr) {
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    _key = nullptr;
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  } else {
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    _key = AllocateHeap(strlen(key)+1, mtArguments);
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    strcpy(_key, key);
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  }
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  _next = nullptr;
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  _internal = internal;
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  _writeable = writeable;
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}
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// Check if head of 'option' matches 'name', and sets 'tail' to the remaining
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// part of the option string.
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static bool match_option(const JavaVMOption *option, const char* name,
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                         const char** tail) {
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  size_t len = strlen(name);
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  if (strncmp(option->optionString, name, len) == 0) {
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    *tail = option->optionString + len;
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    return true;
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  } else {
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    return false;
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  }
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}
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// Check if 'option' matches 'name'. No "tail" is allowed.
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static bool match_option(const JavaVMOption *option, const char* name) {
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  const char* tail = nullptr;
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  bool result = match_option(option, name, &tail);
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  if (tail != nullptr && *tail == '\0') {
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    return result;
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  } else {
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    return false;
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  }
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}
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// Return true if any of the strings in null-terminated array 'names' matches.
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// If tail_allowed is true, then the tail must begin with a colon; otherwise,
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// the option must match exactly.
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static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
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  bool tail_allowed) {
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  for (/* empty */; *names != nullptr; ++names) {
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  if (match_option(option, *names, tail)) {
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      if (**tail == '\0' || (tail_allowed && **tail == ':')) {
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        return true;
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      }
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    }
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  }
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  return false;
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}
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#if INCLUDE_JFR
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static bool _has_jfr_option = false;  // is using JFR
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// return true on failure
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static bool match_jfr_option(const JavaVMOption** option) {
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  assert((*option)->optionString != nullptr, "invariant");
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  char* tail = nullptr;
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  if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
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    _has_jfr_option = true;
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    return Jfr::on_start_flight_recording_option(option, tail);
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  } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
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    _has_jfr_option = true;
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    return Jfr::on_flight_recorder_option(option, tail);
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  }
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  return false;
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}
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bool Arguments::has_jfr_option() {
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  return _has_jfr_option;
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}
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#endif
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static void logOption(const char* opt) {
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  if (PrintVMOptions) {
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    jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
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  }
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}
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bool needs_module_property_warning = false;
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#define MODULE_PROPERTY_PREFIX "jdk.module."
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#define MODULE_PROPERTY_PREFIX_LEN 11
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#define ADDEXPORTS "addexports"
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#define ADDEXPORTS_LEN 10
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#define ADDREADS "addreads"
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#define ADDREADS_LEN 8
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#define ADDOPENS "addopens"
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#define ADDOPENS_LEN 8
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#define PATCH "patch"
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#define PATCH_LEN 5
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#define ADDMODS "addmods"
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#define ADDMODS_LEN 7
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#define LIMITMODS "limitmods"
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#define LIMITMODS_LEN 9
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#define PATH "path"
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#define PATH_LEN 4
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#define UPGRADE_PATH "upgrade.path"
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#define UPGRADE_PATH_LEN 12
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#define ENABLE_NATIVE_ACCESS "enable.native.access"
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#define ENABLE_NATIVE_ACCESS_LEN 20
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// Return TRUE if option matches 'property', or 'property=', or 'property.'.
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static bool matches_property_suffix(const char* option, const char* property, size_t len) {
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  return ((strncmp(option, property, len) == 0) &&
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          (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
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}
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// Return true if property starts with "jdk.module." and its ensuing chars match
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// any of the reserved module properties.
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// property should be passed without the leading "-D".
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bool Arguments::is_internal_module_property(const char* property) {
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  if  (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
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    const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
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    if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
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        matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
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        matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
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        matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
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        matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
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        matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
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        matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
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        matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
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        matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
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      return true;
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    }
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  }
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  return false;
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}
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// Process java launcher properties.
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void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
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  // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
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  // Must do this before setting up other system properties,
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  // as some of them may depend on launcher type.
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  for (int index = 0; index < args->nOptions; index++) {
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    const JavaVMOption* option = args->options + index;
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    const char* tail;
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    if (match_option(option, "-Dsun.java.launcher=", &tail)) {
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      process_java_launcher_argument(tail, option->extraInfo);
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      continue;
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    }
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    if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
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      if (strcmp(tail, "true") == 0) {
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        _sun_java_launcher_is_altjvm = true;
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      }
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      continue;
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    }
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  }
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}
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// Initialize system properties key and value.
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void Arguments::init_system_properties() {
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  // Set up _boot_class_path which is not a property but
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  // relies heavily on argument processing and the jdk.boot.class.path.append
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  // property. It is used to store the underlying boot class path.
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  _boot_class_path = new PathString(nullptr);
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  PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
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                                                           "Java Virtual Machine Specification",  false));
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  PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
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  PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
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  PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(),  false));
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  // Initialize the vm.info now, but it will need updating after argument parsing.
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  _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
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  // Following are JVMTI agent writable properties.
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  // Properties values are set to nullptr and they are
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  // os specific they are initialized in os::init_system_properties_values().
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  _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr,  true);
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  _java_library_path = new SystemProperty("java.library.path", nullptr,  true);
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  _java_home =  new SystemProperty("java.home", nullptr,  true);
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  _java_class_path = new SystemProperty("java.class.path", "",  true);
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  // jdk.boot.class.path.append is a non-writeable, internal property.
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  // It can only be set by either:
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  //    - -Xbootclasspath/a:
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  //    - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
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  _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
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  // Add to System Property list.
389
  PropertyList_add(&_system_properties, _sun_boot_library_path);
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  PropertyList_add(&_system_properties, _java_library_path);
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  PropertyList_add(&_system_properties, _java_home);
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  PropertyList_add(&_system_properties, _java_class_path);
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  PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
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  PropertyList_add(&_system_properties, _vm_info);
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  // Set OS specific system properties values
397
  os::init_system_properties_values();
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}
399

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// Update/Initialize System properties after JDK version number is known
401
void Arguments::init_version_specific_system_properties() {
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  enum { bufsz = 16 };
403
  char buffer[bufsz];
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  const char* spec_vendor = "Oracle Corporation";
405
  uint32_t spec_version = JDK_Version::current().major_version();
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  jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
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  PropertyList_add(&_system_properties,
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      new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
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  PropertyList_add(&_system_properties,
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      new SystemProperty("java.vm.specification.version", buffer, false));
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  PropertyList_add(&_system_properties,
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      new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
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}
416

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/*
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 *  -XX argument processing:
419
 *
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 *  -XX arguments are defined in several places, such as:
421
 *      globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
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 *  -XX arguments are parsed in parse_argument().
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 *  -XX argument bounds checking is done in check_vm_args_consistency().
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 *
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 * Over time -XX arguments may change. There are mechanisms to handle common cases:
426
 *
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 *      ALIASED: An option that is simply another name for another option. This is often
428
 *               part of the process of deprecating a flag, but not all aliases need
429
 *               to be deprecated.
430
 *
431
 *               Create an alias for an option by adding the old and new option names to the
432
 *               "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
433
 *
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 *   DEPRECATED: An option that is supported, but a warning is printed to let the user know that
435
 *               support may be removed in the future. Both regular and aliased options may be
436
 *               deprecated.
437
 *
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 *               Add a deprecation warning for an option (or alias) by adding an entry in the
439
 *               "special_jvm_flags" table and setting the "deprecated_in" field.
440
 *               Often an option "deprecated" in one major release will
441
 *               be made "obsolete" in the next. In this case the entry should also have its
442
 *               "obsolete_in" field set.
443
 *
444
 *     OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
445
 *               on the command line. A warning is printed to let the user know that option might not
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 *               be accepted in the future.
447
 *
448
 *               Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
449
 *               table and setting the "obsolete_in" field.
450
 *
451
 *      EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
452
 *               to the current JDK version. The system will flatly refuse to admit the existence of
453
 *               the flag. This allows a flag to die automatically over JDK releases.
454
 *
455
 *               Note that manual cleanup of expired options should be done at major JDK version upgrades:
456
 *                  - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
457
 *                  - Newly obsolete or expired deprecated options should have their global variable
458
 *                    definitions removed (from globals.hpp, etc) and related implementations removed.
459
 *
460
 * Recommended approach for removing options:
461
 *
462
 * To remove options commonly used by customers (e.g. product -XX options), use
463
 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
464
 *
465
 * To remove internal options (e.g. diagnostic, experimental, develop options), use
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 * a 2-step model adding major release numbers to the obsolete and expire columns.
467
 *
468
 * To change the name of an option, use the alias table as well as a 2-step
469
 * model adding major release numbers to the deprecate and expire columns.
470
 * Think twice about aliasing commonly used customer options.
471
 *
472
 * There are times when it is appropriate to leave a future release number as undefined.
473
 *
474
 * Tests:  Aliases should be tested in VMAliasOptions.java.
475
 *         Deprecated options should be tested in VMDeprecatedOptions.java.
476
 */
477

478
// The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
479
// "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
480
// When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
481
// the command-line as usual, but will issue a warning.
482
// When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
483
// the command-line, while issuing a warning and ignoring the flag value.
484
// Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
485
// existence of the flag.
486
//
487
// MANUAL CLEANUP ON JDK VERSION UPDATES:
488
// This table ensures that the handling of options will update automatically when the JDK
489
// version is incremented, but the source code needs to be cleanup up manually:
490
// - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
491
//   variable should be removed, as well as users of the variable.
492
// - As "deprecated" options age into "obsolete" options, move the entry into the
493
//   "Obsolete Flags" section of the table.
494
// - All expired options should be removed from the table.
495
static SpecialFlag const special_jvm_flags[] = {
496
  // -------------- Deprecated Flags --------------
497
  // --- Non-alias flags - sorted by obsolete_in then expired_in:
498
  { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
499
  { "FlightRecorder",               JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
500
  { "ZGenerational",                JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() },
501
  { "DumpSharedSpaces",             JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
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  { "DynamicDumpSharedSpaces",      JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
503
  { "RequireSharedSpaces",          JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
504
  { "UseSharedSpaces",              JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
505
  { "DontYieldALot",                JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
506
  { "UseNotificationThread",        JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
507
  { "LockingMode",                  JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
508
  // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
509
  { "CreateMinidumpOnCrash",        JDK_Version::jdk(9),  JDK_Version::undefined(), JDK_Version::undefined() },
510

511
  // -------------- Obsolete Flags - sorted by expired_in --------------
512

513
  { "MetaspaceReclaimPolicy",       JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
514

515
  { "PreserveAllAnnotations",       JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
516
  { "UseEmptySlotsInSupers",        JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
517
  { "OldSize",                      JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
518
#if defined(X86)
519
  { "UseRTMLocking",                JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
520
  { "UseRTMDeopt",                  JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
521
  { "RTMRetryCount",                JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
522
#endif // X86
523

524
  { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
525
  { "UseVtableBasedCHA",               JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
526
#ifdef ASSERT
527
  { "DummyObsoleteTestFlag",        JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
528
#endif
529

530
#ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
531
  // These entries will generate build errors.  Their purpose is to test the macros.
532
  { "dep > obs",                    JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
533
  { "dep > exp ",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
534
  { "obs > exp ",                   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
535
  { "obs > exp",                    JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
536
  { "not deprecated or obsolete",   JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
537
  { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
538
  { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
539
#endif
540

541
  { nullptr, JDK_Version(0), JDK_Version(0) }
542
};
543

544
// Flags that are aliases for other flags.
545
typedef struct {
546
  const char* alias_name;
547
  const char* real_name;
548
} AliasedFlag;
549

550
static AliasedFlag const aliased_jvm_flags[] = {
551
  { "CreateMinidumpOnCrash",    "CreateCoredumpOnCrash" },
552
  { nullptr, nullptr}
553
};
554

555
// Return true if "v" is less than "other", where "other" may be "undefined".
556
static bool version_less_than(JDK_Version v, JDK_Version other) {
557
  assert(!v.is_undefined(), "must be defined");
558
  if (!other.is_undefined() && v.compare(other) >= 0) {
559
    return false;
560
  } else {
561
    return true;
562
  }
563
}
564

565
static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
566
  for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
567
    if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
568
      flag = special_jvm_flags[i];
569
      return true;
570
    }
571
  }
572
  return false;
573
}
574

575
bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
576
  assert(version != nullptr, "Must provide a version buffer");
577
  SpecialFlag flag;
578
  if (lookup_special_flag(flag_name, flag)) {
579
    if (!flag.obsolete_in.is_undefined()) {
580
      if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
581
        *version = flag.obsolete_in;
582
        // This flag may have been marked for obsoletion in this version, but we may not
583
        // have actually removed it yet. Rather than ignoring it as soon as we reach
584
        // this version we allow some time for the removal to happen. So if the flag
585
        // still actually exists we process it as normal, but issue an adjusted warning.
586
        const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
587
        if (real_flag != nullptr) {
588
          char version_str[256];
589
          version->to_string(version_str, sizeof(version_str));
590
          warning("Temporarily processing option %s; support is scheduled for removal in %s",
591
                  flag_name, version_str);
592
          return false;
593
        }
594
        return true;
595
      }
596
    }
597
  }
598
  return false;
599
}
600

601
int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
602
  assert(version != nullptr, "Must provide a version buffer");
603
  SpecialFlag flag;
604
  if (lookup_special_flag(flag_name, flag)) {
605
    if (!flag.deprecated_in.is_undefined()) {
606
      if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
607
          version_less_than(JDK_Version::current(), flag.expired_in)) {
608
        *version = flag.deprecated_in;
609
        return 1;
610
      } else {
611
        return -1;
612
      }
613
    }
614
  }
615
  return 0;
616
}
617

618
const char* Arguments::real_flag_name(const char *flag_name) {
619
  for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
620
    const AliasedFlag& flag_status = aliased_jvm_flags[i];
621
    if (strcmp(flag_status.alias_name, flag_name) == 0) {
622
        return flag_status.real_name;
623
    }
624
  }
625
  return flag_name;
626
}
627

628
#ifdef ASSERT
629
static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
630
  for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
631
    if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
632
      return true;
633
    }
634
  }
635
  return false;
636
}
637

638
// Verifies the correctness of the entries in the special_jvm_flags table.
639
// If there is a semantic error (i.e. a bug in the table) such as the obsoletion
640
// version being earlier than the deprecation version, then a warning is issued
641
// and verification fails - by returning false. If it is detected that the table
642
// is out of date, with respect to the current version, then ideally a warning is
643
// issued but verification does not fail. This allows the VM to operate when the
644
// version is first updated, without needing to update all the impacted flags at
645
// the same time. In practice we can't issue the warning immediately when the version
646
// is updated as it occurs for every test and some tests are not prepared to handle
647
// unexpected output - see 8196739. Instead we only check if the table is up-to-date
648
// if the check_globals flag is true, and in addition allow a grace period and only
649
// check for stale flags when we hit build 25 (which is far enough into the 6 month
650
// release cycle that all flag updates should have been processed, whilst still
651
// leaving time to make the change before RDP2).
652
// We use a gtest to call this, passing true, so that we can detect stale flags before
653
// the end of the release cycle.
654

655
static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
656

657
bool Arguments::verify_special_jvm_flags(bool check_globals) {
658
  bool success = true;
659
  for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
660
    const SpecialFlag& flag = special_jvm_flags[i];
661
    if (lookup_special_flag(flag.name, i)) {
662
      warning("Duplicate special flag declaration \"%s\"", flag.name);
663
      success = false;
664
    }
665
    if (flag.deprecated_in.is_undefined() &&
666
        flag.obsolete_in.is_undefined()) {
667
      warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
668
      success = false;
669
    }
670

671
    if (!flag.deprecated_in.is_undefined()) {
672
      if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
673
        warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
674
        success = false;
675
      }
676

677
      if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
678
        warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
679
        success = false;
680
      }
681
    }
682

683
    if (!flag.obsolete_in.is_undefined()) {
684
      if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
685
        warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
686
        success = false;
687
      }
688

689
      // if flag has become obsolete it should not have a "globals" flag defined anymore.
690
      if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
691
          !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
692
        if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
693
          warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
694
          success = false;
695
        }
696
      }
697

698
    } else if (!flag.expired_in.is_undefined()) {
699
      warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
700
      success = false;
701
    }
702

703
    if (!flag.expired_in.is_undefined()) {
704
      // if flag has become expired it should not have a "globals" flag defined anymore.
705
      if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
706
          !version_less_than(JDK_Version::current(), flag.expired_in)) {
707
        if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
708
          warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
709
          success = false;
710
        }
711
      }
712
    }
713
  }
714
  return success;
715
}
716
#endif
717

718
bool Arguments::atojulong(const char *s, julong* result) {
719
  return parse_integer(s, result);
720
}
721

722
Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
723
  if (size < min_size) return arg_too_small;
724
  if (size > max_size) return arg_too_big;
725
  return arg_in_range;
726
}
727

728
// Describe an argument out of range error
729
void Arguments::describe_range_error(ArgsRange errcode) {
730
  switch(errcode) {
731
  case arg_too_big:
732
    jio_fprintf(defaultStream::error_stream(),
733
                "The specified size exceeds the maximum "
734
                "representable size.\n");
735
    break;
736
  case arg_too_small:
737
  case arg_unreadable:
738
  case arg_in_range:
739
    // do nothing for now
740
    break;
741
  default:
742
    ShouldNotReachHere();
743
  }
744
}
745

746
static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
747
  if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
748
    return true;
749
  } else {
750
    return false;
751
  }
752
}
753

754
static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
755
  // strtod allows leading whitespace, but our flag format does not.
756
  if (*value == '\0' || isspace((unsigned char) *value)) {
757
    return false;
758
  }
759
  char* end;
760
  errno = 0;
761
  double v = strtod(value, &end);
762
  if ((errno != 0) || (*end != 0)) {
763
    return false;
764
  }
765
  if (g_isnan(v) || !g_isfinite(v)) {
766
    // Currently we cannot handle these special values.
767
    return false;
768
  }
769

770
  if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
771
    return true;
772
  }
773
  return false;
774
}
775

776
static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
777
  JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
778

779
  if (flag->is_int()) {
780
    int v;
781
    if (parse_integer(value, &v)) {
782
      result = JVMFlagAccess::set_int(flag, &v, origin);
783
    }
784
  } else if (flag->is_uint()) {
785
    uint v;
786
    if (parse_integer(value, &v)) {
787
      result = JVMFlagAccess::set_uint(flag, &v, origin);
788
    }
789
  } else if (flag->is_intx()) {
790
    intx v;
791
    if (parse_integer(value, &v)) {
792
      result = JVMFlagAccess::set_intx(flag, &v, origin);
793
    }
794
  } else if (flag->is_uintx()) {
795
    uintx v;
796
    if (parse_integer(value, &v)) {
797
      result = JVMFlagAccess::set_uintx(flag, &v, origin);
798
    }
799
  } else if (flag->is_uint64_t()) {
800
    uint64_t v;
801
    if (parse_integer(value, &v)) {
802
      result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
803
    }
804
  } else if (flag->is_size_t()) {
805
    size_t v;
806
    if (parse_integer(value, &v)) {
807
      result = JVMFlagAccess::set_size_t(flag, &v, origin);
808
    }
809
  }
810

811
  return result == JVMFlag::SUCCESS;
812
}
813

814
static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
815
  if (value[0] == '\0') {
816
    value = nullptr;
817
  }
818
  if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
819
  // Contract:  JVMFlag always returns a pointer that needs freeing.
820
  FREE_C_HEAP_ARRAY(char, value);
821
  return true;
822
}
823

824
static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
825
  const char* old_value = "";
826
  if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
827
  size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
828
  size_t new_len = strlen(new_value);
829
  const char* value;
830
  char* free_this_too = nullptr;
831
  if (old_len == 0) {
832
    value = new_value;
833
  } else if (new_len == 0) {
834
    value = old_value;
835
  } else {
836
     size_t length = old_len + 1 + new_len + 1;
837
     char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
838
    // each new setting adds another LINE to the switch:
839
    jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
840
    value = buf;
841
    free_this_too = buf;
842
  }
843
  (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
844
  // JVMFlag always returns a pointer that needs freeing.
845
  FREE_C_HEAP_ARRAY(char, value);
846
  // JVMFlag made its own copy, so I must delete my own temp. buffer.
847
  FREE_C_HEAP_ARRAY(char, free_this_too);
848
  return true;
849
}
850

851
const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
852
  const char* real_name = real_flag_name(arg);
853
  JDK_Version since = JDK_Version();
854
  switch (is_deprecated_flag(arg, &since)) {
855
  case -1: {
856
      // Obsolete or expired, so don't process normally,
857
      // but allow for an obsolete flag we're still
858
      // temporarily allowing.
859
      if (!is_obsolete_flag(arg, &since)) {
860
        return real_name;
861
      }
862
      // Note if we're not considered obsolete then we can't be expired either
863
      // as obsoletion must come first.
864
      return nullptr;
865
    }
866
    case 0:
867
      return real_name;
868
    case 1: {
869
      char version[256];
870
      since.to_string(version, sizeof(version));
871
      if (real_name != arg) {
872
        warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
873
                arg, version, real_name);
874
      } else {
875
        warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
876
                arg, version);
877
      }
878
      return real_name;
879
    }
880
  }
881
  ShouldNotReachHere();
882
  return nullptr;
883
}
884

885
#define BUFLEN 255
886

887
JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
888
  char name_copied[BUFLEN+1];
889
  if (name[name_length] != 0) {
890
    if (name_length > BUFLEN) {
891
      return nullptr;
892
    } else {
893
      strncpy(name_copied, name, name_length);
894
      name_copied[name_length] = '\0';
895
      name = name_copied;
896
    }
897
  }
898

899
  const char* real_name = Arguments::handle_aliases_and_deprecation(name);
900
  if (real_name == nullptr) {
901
    return nullptr;
902
  }
903
  JVMFlag* flag = JVMFlag::find_flag(real_name);
904
  return flag;
905
}
906

907
bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
908
  bool is_bool = false;
909
  bool bool_val = false;
910
  char c = *arg;
911
  if (c == '+' || c == '-') {
912
    is_bool = true;
913
    bool_val = (c == '+');
914
    arg++;
915
  }
916

917
  const char* name = arg;
918
  while (true) {
919
    c = *arg;
920
    if (isalnum(c) || (c == '_')) {
921
      ++arg;
922
    } else {
923
      break;
924
    }
925
  }
926

927
  size_t name_len = size_t(arg - name);
928
  if (name_len == 0) {
929
    return false;
930
  }
931

932
  JVMFlag* flag = find_jvm_flag(name, name_len);
933
  if (flag == nullptr) {
934
    return false;
935
  }
936

937
  if (is_bool) {
938
    if (*arg != 0) {
939
      // Error -- extra characters such as -XX:+BoolFlag=123
940
      return false;
941
    }
942
    return set_bool_flag(flag, bool_val, origin);
943
  }
944

945
  if (arg[0] == '=') {
946
    const char* value = arg + 1;
947
    if (flag->is_ccstr()) {
948
      if (flag->ccstr_accumulates()) {
949
        return append_to_string_flag(flag, value, origin);
950
      } else {
951
        return set_string_flag(flag, value, origin);
952
      }
953
    } else if (flag->is_double()) {
954
      return set_fp_numeric_flag(flag, value, origin);
955
    } else {
956
      return set_numeric_flag(flag, value, origin);
957
    }
958
  }
959

960
  if (arg[0] == ':' && arg[1] == '=') {
961
    // -XX:Foo:=xxx will reset the string flag to the given value.
962
    const char* value = arg + 2;
963
    return set_string_flag(flag, value, origin);
964
  }
965

966
  return false;
967
}
968

969
void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
970
  assert(bldarray != nullptr, "illegal argument");
971

972
  if (arg == nullptr) {
973
    return;
974
  }
975

976
  int new_count = *count + 1;
977

978
  // expand the array and add arg to the last element
979
  if (*bldarray == nullptr) {
980
    *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
981
  } else {
982
    *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
983
  }
984
  (*bldarray)[*count] = os::strdup_check_oom(arg);
985
  *count = new_count;
986
}
987

988
void Arguments::build_jvm_args(const char* arg) {
989
  add_string(&_jvm_args_array, &_num_jvm_args, arg);
990
}
991

992
void Arguments::build_jvm_flags(const char* arg) {
993
  add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
994
}
995

996
// utility function to return a string that concatenates all
997
// strings in a given char** array
998
const char* Arguments::build_resource_string(char** args, int count) {
999
  if (args == nullptr || count == 0) {
1000
    return nullptr;
1001
  }
1002
  size_t length = 0;
1003
  for (int i = 0; i < count; i++) {
1004
    length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1005
  }
1006
  char* s = NEW_RESOURCE_ARRAY(char, length);
1007
  char* dst = s;
1008
  for (int j = 0; j < count; j++) {
1009
    size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1010
    jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1011
    dst += offset;
1012
    length -= offset;
1013
  }
1014
  return (const char*) s;
1015
}
1016

1017
void Arguments::print_on(outputStream* st) {
1018
  st->print_cr("VM Arguments:");
1019
  if (num_jvm_flags() > 0) {
1020
    st->print("jvm_flags: "); print_jvm_flags_on(st);
1021
    st->cr();
1022
  }
1023
  if (num_jvm_args() > 0) {
1024
    st->print("jvm_args: "); print_jvm_args_on(st);
1025
    st->cr();
1026
  }
1027
  st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1028
  if (_java_class_path != nullptr) {
1029
    char* path = _java_class_path->value();
1030
    size_t len = strlen(path);
1031
    st->print("java_class_path (initial): ");
1032
    // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1033
    if (len == 0) {
1034
      st->print_raw_cr("<not set>");
1035
    } else {
1036
      st->print_raw_cr(path, len);
1037
    }
1038
  }
1039
  st->print_cr("Launcher Type: %s", _sun_java_launcher);
1040
}
1041

1042
void Arguments::print_summary_on(outputStream* st) {
1043
  // Print the command line.  Environment variables that are helpful for
1044
  // reproducing the problem are written later in the hs_err file.
1045
  // flags are from setting file
1046
  if (num_jvm_flags() > 0) {
1047
    st->print_raw("Settings File: ");
1048
    print_jvm_flags_on(st);
1049
    st->cr();
1050
  }
1051
  // args are the command line and environment variable arguments.
1052
  st->print_raw("Command Line: ");
1053
  if (num_jvm_args() > 0) {
1054
    print_jvm_args_on(st);
1055
  }
1056
  // this is the classfile and any arguments to the java program
1057
  if (java_command() != nullptr) {
1058
    st->print("%s", java_command());
1059
  }
1060
  st->cr();
1061
}
1062

1063
void Arguments::print_jvm_flags_on(outputStream* st) {
1064
  if (_num_jvm_flags > 0) {
1065
    for (int i=0; i < _num_jvm_flags; i++) {
1066
      st->print("%s ", _jvm_flags_array[i]);
1067
    }
1068
  }
1069
}
1070

1071
void Arguments::print_jvm_args_on(outputStream* st) {
1072
  if (_num_jvm_args > 0) {
1073
    for (int i=0; i < _num_jvm_args; i++) {
1074
      st->print("%s ", _jvm_args_array[i]);
1075
    }
1076
  }
1077
}
1078

1079
bool Arguments::process_argument(const char* arg,
1080
                                 jboolean ignore_unrecognized,
1081
                                 JVMFlagOrigin origin) {
1082
  JDK_Version since = JDK_Version();
1083

1084
  if (parse_argument(arg, origin)) {
1085
    return true;
1086
  }
1087

1088
  // Determine if the flag has '+', '-', or '=' characters.
1089
  bool has_plus_minus = (*arg == '+' || *arg == '-');
1090
  const char* const argname = has_plus_minus ? arg + 1 : arg;
1091

1092
  size_t arg_len;
1093
  const char* equal_sign = strchr(argname, '=');
1094
  if (equal_sign == nullptr) {
1095
    arg_len = strlen(argname);
1096
  } else {
1097
    arg_len = equal_sign - argname;
1098
  }
1099

1100
  // Only make the obsolete check for valid arguments.
1101
  if (arg_len <= BUFLEN) {
1102
    // Construct a string which consists only of the argument name without '+', '-', or '='.
1103
    char stripped_argname[BUFLEN+1]; // +1 for '\0'
1104
    jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1105
    if (is_obsolete_flag(stripped_argname, &since)) {
1106
      char version[256];
1107
      since.to_string(version, sizeof(version));
1108
      warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1109
      return true;
1110
    }
1111
  }
1112

1113
  // For locked flags, report a custom error message if available.
1114
  // Otherwise, report the standard unrecognized VM option.
1115
  const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1116
  if (found_flag != nullptr) {
1117
    char locked_message_buf[BUFLEN];
1118
    JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1119
    if (strlen(locked_message_buf) != 0) {
1120
#ifdef PRODUCT
1121
      bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1122
      if (ignore_unrecognized && mismatched) {
1123
        return true;
1124
      }
1125
#endif
1126
      jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1127
    }
1128
    if (found_flag->is_bool() && !has_plus_minus) {
1129
      jio_fprintf(defaultStream::error_stream(),
1130
        "Missing +/- setting for VM option '%s'\n", argname);
1131
    } else if (!found_flag->is_bool() && has_plus_minus) {
1132
      jio_fprintf(defaultStream::error_stream(),
1133
        "Unexpected +/- setting in VM option '%s'\n", argname);
1134
    } else {
1135
      jio_fprintf(defaultStream::error_stream(),
1136
        "Improperly specified VM option '%s'\n", argname);
1137
    }
1138
  } else {
1139
    if (ignore_unrecognized) {
1140
      return true;
1141
    }
1142
    jio_fprintf(defaultStream::error_stream(),
1143
                "Unrecognized VM option '%s'\n", argname);
1144
    JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1145
    if (fuzzy_matched != nullptr) {
1146
      jio_fprintf(defaultStream::error_stream(),
1147
                  "Did you mean '%s%s%s'?\n",
1148
                  (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1149
                  fuzzy_matched->name(),
1150
                  (fuzzy_matched->is_bool()) ? "" : "=<value>");
1151
    }
1152
  }
1153

1154
  // allow for commandline "commenting out" options like -XX:#+Verbose
1155
  return arg[0] == '#';
1156
}
1157

1158
bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1159
  FILE* stream = os::fopen(file_name, "rb");
1160
  if (stream == nullptr) {
1161
    if (should_exist) {
1162
      jio_fprintf(defaultStream::error_stream(),
1163
                  "Could not open settings file %s\n", file_name);
1164
      return false;
1165
    } else {
1166
      return true;
1167
    }
1168
  }
1169

1170
  char token[1024];
1171
  int  pos = 0;
1172

1173
  bool in_white_space = true;
1174
  bool in_comment     = false;
1175
  bool in_quote       = false;
1176
  int  quote_c        = 0;
1177
  bool result         = true;
1178

1179
  int c = getc(stream);
1180
  while(c != EOF && pos < (int)(sizeof(token)-1)) {
1181
    if (in_white_space) {
1182
      if (in_comment) {
1183
        if (c == '\n') in_comment = false;
1184
      } else {
1185
        if (c == '#') in_comment = true;
1186
        else if (!isspace((unsigned char) c)) {
1187
          in_white_space = false;
1188
          token[pos++] = checked_cast<char>(c);
1189
        }
1190
      }
1191
    } else {
1192
      if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1193
        // token ends at newline, or at unquoted whitespace
1194
        // this allows a way to include spaces in string-valued options
1195
        token[pos] = '\0';
1196
        logOption(token);
1197
        result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1198
        build_jvm_flags(token);
1199
        pos = 0;
1200
        in_white_space = true;
1201
        in_quote = false;
1202
      } else if (!in_quote && (c == '\'' || c == '"')) {
1203
        in_quote = true;
1204
        quote_c = c;
1205
      } else if (in_quote && (c == quote_c)) {
1206
        in_quote = false;
1207
      } else {
1208
        token[pos++] = checked_cast<char>(c);
1209
      }
1210
    }
1211
    c = getc(stream);
1212
  }
1213
  if (pos > 0) {
1214
    token[pos] = '\0';
1215
    result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1216
    build_jvm_flags(token);
1217
  }
1218
  fclose(stream);
1219
  return result;
1220
}
1221

1222
//=============================================================================================================
1223
// Parsing of properties (-D)
1224

1225
const char* Arguments::get_property(const char* key) {
1226
  return PropertyList_get_value(system_properties(), key);
1227
}
1228

1229
bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1230
  const char* eq = strchr(prop, '=');
1231
  const char* key;
1232
  const char* value = "";
1233

1234
  if (eq == nullptr) {
1235
    // property doesn't have a value, thus use passed string
1236
    key = prop;
1237
  } else {
1238
    // property have a value, thus extract it and save to the
1239
    // allocated string
1240
    size_t key_len = eq - prop;
1241
    char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1242

1243
    jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1244
    key = tmp_key;
1245

1246
    value = &prop[key_len + 1];
1247
  }
1248

1249
  if (internal == ExternalProperty) {
1250
    CDSConfig::check_incompatible_property(key, value);
1251
  }
1252

1253
  if (strcmp(key, "java.compiler") == 0) {
1254
    // we no longer support java.compiler system property, log a warning and let it get
1255
    // passed to Java, like any other system property
1256
    if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1257
        // for applications using NONE or empty value, log a more informative message
1258
        warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1259
    } else {
1260
        warning("The java.compiler system property is obsolete and no longer supported.");
1261
    }
1262
  } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1263
    // sun.java.launcher.is_altjvm property is
1264
    // private and is processed in process_sun_java_launcher_properties();
1265
    // the sun.java.launcher property is passed on to the java application
1266
  } else if (strcmp(key, "sun.boot.library.path") == 0) {
1267
    // append is true, writable is true, internal is false
1268
    PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1269
                            WriteableProperty, ExternalProperty);
1270
  } else {
1271
    if (strcmp(key, "sun.java.command") == 0) {
1272
      char *old_java_command = _java_command;
1273
      _java_command = os::strdup_check_oom(value, mtArguments);
1274
      if (old_java_command != nullptr) {
1275
        os::free(old_java_command);
1276
      }
1277
    } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1278
      // If this property is set on the command line then its value will be
1279
      // displayed in VM error logs as the URL at which to submit such logs.
1280
      // Normally the URL displayed in error logs is different from the value
1281
      // of this system property, so a different property should have been
1282
      // used here, but we leave this as-is in case someone depends upon it.
1283
      const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1284
      // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1285
      // its value without going through the property list or making a Java call.
1286
      _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1287
      if (old_java_vendor_url_bug != nullptr) {
1288
        os::free((void *)old_java_vendor_url_bug);
1289
      }
1290
    }
1291

1292
    // Create new property and add at the end of the list
1293
    PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1294
  }
1295

1296
  if (key != prop) {
1297
    // SystemProperty copy passed value, thus free previously allocated
1298
    // memory
1299
    FreeHeap((void *)key);
1300
  }
1301

1302
  return true;
1303
}
1304

1305
//===========================================================================================================
1306
// Setting int/mixed/comp mode flags
1307

1308
void Arguments::set_mode_flags(Mode mode) {
1309
  // Set up default values for all flags.
1310
  // If you add a flag to any of the branches below,
1311
  // add a default value for it here.
1312
  _mode                      = mode;
1313

1314
  // Ensure Agent_OnLoad has the correct initial values.
1315
  // This may not be the final mode; mode may change later in onload phase.
1316
  PropertyList_unique_add(&_system_properties, "java.vm.info",
1317
                          VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1318

1319
  UseInterpreter             = true;
1320
  UseCompiler                = true;
1321
  UseLoopCounter             = true;
1322

1323
  // Default values may be platform/compiler dependent -
1324
  // use the saved values
1325
  ClipInlining               = Arguments::_ClipInlining;
1326
  AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1327
  UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1328
  BackgroundCompilation      = Arguments::_BackgroundCompilation;
1329

1330
  // Change from defaults based on mode
1331
  switch (mode) {
1332
  default:
1333
    ShouldNotReachHere();
1334
    break;
1335
  case _int:
1336
    UseCompiler              = false;
1337
    UseLoopCounter           = false;
1338
    AlwaysCompileLoopMethods = false;
1339
    UseOnStackReplacement    = false;
1340
    break;
1341
  case _mixed:
1342
    // same as default
1343
    break;
1344
  case _comp:
1345
    UseInterpreter           = false;
1346
    BackgroundCompilation    = false;
1347
    ClipInlining             = false;
1348
    break;
1349
  }
1350
}
1351

1352
// Conflict: required to use shared spaces (-Xshare:on), but
1353
// incompatible command line options were chosen.
1354
void Arguments::no_shared_spaces(const char* message) {
1355
  if (RequireSharedSpaces) {
1356
    jio_fprintf(defaultStream::error_stream(),
1357
      "Class data sharing is inconsistent with other specified options.\n");
1358
    vm_exit_during_initialization("Unable to use shared archive", message);
1359
  } else {
1360
    log_info(cds)("Unable to use shared archive: %s", message);
1361
    UseSharedSpaces = false;
1362
  }
1363
}
1364

1365
static void set_object_alignment() {
1366
  // Object alignment.
1367
  assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1368
  MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1369
  assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1370
  MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1371
  assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1372
  MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1373

1374
  LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1375
  LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1376

1377
  // Oop encoding heap max
1378
  OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1379
}
1380

1381
size_t Arguments::max_heap_for_compressed_oops() {
1382
  // Avoid sign flip.
1383
  assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1384
  // We need to fit both the null page and the heap into the memory budget, while
1385
  // keeping alignment constraints of the heap. To guarantee the latter, as the
1386
  // null page is located before the heap, we pad the null page to the conservative
1387
  // maximum alignment that the GC may ever impose upon the heap.
1388
  size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1389
                                                  _conservative_max_heap_alignment);
1390

1391
  LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1392
  NOT_LP64(ShouldNotReachHere(); return 0);
1393
}
1394

1395
void Arguments::set_use_compressed_oops() {
1396
#ifdef _LP64
1397
  // MaxHeapSize is not set up properly at this point, but
1398
  // the only value that can override MaxHeapSize if we are
1399
  // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1400
  size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1401

1402
  if (max_heap_size <= max_heap_for_compressed_oops()) {
1403
    if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1404
      FLAG_SET_ERGO(UseCompressedOops, true);
1405
    }
1406
  } else {
1407
    if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1408
      warning("Max heap size too large for Compressed Oops");
1409
      FLAG_SET_DEFAULT(UseCompressedOops, false);
1410
    }
1411
  }
1412
#endif // _LP64
1413
}
1414

1415
void Arguments::set_use_compressed_klass_ptrs() {
1416
#ifdef _LP64
1417
  assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1418
         "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1419
#endif // _LP64
1420
}
1421

1422
void Arguments::set_conservative_max_heap_alignment() {
1423
  // The conservative maximum required alignment for the heap is the maximum of
1424
  // the alignments imposed by several sources: any requirements from the heap
1425
  // itself and the maximum page size we may run the VM with.
1426
  size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1427
  _conservative_max_heap_alignment = MAX4(heap_alignment,
1428
                                          os::vm_allocation_granularity(),
1429
                                          os::max_page_size(),
1430
                                          GCArguments::compute_heap_alignment());
1431
}
1432

1433
jint Arguments::set_ergonomics_flags() {
1434
  GCConfig::initialize();
1435

1436
  set_conservative_max_heap_alignment();
1437

1438
#ifdef _LP64
1439
  set_use_compressed_oops();
1440
  set_use_compressed_klass_ptrs();
1441

1442
  // Also checks that certain machines are slower with compressed oops
1443
  // in vm_version initialization code.
1444
#endif // _LP64
1445

1446
  return JNI_OK;
1447
}
1448

1449
size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1450
  size_t max_allocatable;
1451
  size_t result = limit;
1452
  if (os::has_allocatable_memory_limit(&max_allocatable)) {
1453
    // The AggressiveHeap check is a temporary workaround to avoid calling
1454
    // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1455
    // selected. This works because AggressiveHeap implies UseParallelGC
1456
    // where we know the ratio will be 1. Once the AggressiveHeap option is
1457
    // removed, this can be cleaned up.
1458
    size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1459
    size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1460
    result = MIN2(result, max_allocatable / fraction);
1461
  }
1462
  return result;
1463
}
1464

1465
// Use static initialization to get the default before parsing
1466
static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1467

1468
void Arguments::set_heap_size() {
1469
  julong phys_mem;
1470

1471
  // If the user specified one of these options, they
1472
  // want specific memory sizing so do not limit memory
1473
  // based on compressed oops addressability.
1474
  // Also, memory limits will be calculated based on
1475
  // available os physical memory, not our MaxRAM limit,
1476
  // unless MaxRAM is also specified.
1477
  bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1478
                           !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1479
                           !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1480
                           !FLAG_IS_DEFAULT(MaxRAM));
1481
  if (override_coop_limit) {
1482
    if (FLAG_IS_DEFAULT(MaxRAM)) {
1483
      phys_mem = os::physical_memory();
1484
      FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1485
    } else {
1486
      phys_mem = (julong)MaxRAM;
1487
    }
1488
  } else {
1489
    phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1490
                                       : (julong)MaxRAM;
1491
  }
1492

1493
  // If the maximum heap size has not been set with -Xmx,
1494
  // then set it as fraction of the size of physical memory,
1495
  // respecting the maximum and minimum sizes of the heap.
1496
  if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1497
    julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1498
    const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1499
    if (reasonable_min < MaxHeapSize) {
1500
      // Small physical memory, so use a minimum fraction of it for the heap
1501
      reasonable_max = reasonable_min;
1502
    } else {
1503
      // Not-small physical memory, so require a heap at least
1504
      // as large as MaxHeapSize
1505
      reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1506
    }
1507

1508
    if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1509
      // Limit the heap size to ErgoHeapSizeLimit
1510
      reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1511
    }
1512

1513
    reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1514

1515
    if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1516
      // An initial heap size was specified on the command line,
1517
      // so be sure that the maximum size is consistent.  Done
1518
      // after call to limit_heap_by_allocatable_memory because that
1519
      // method might reduce the allocation size.
1520
      reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1521
    } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1522
      reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1523
    }
1524

1525
#ifdef _LP64
1526
    if (UseCompressedOops || UseCompressedClassPointers) {
1527
      // HeapBaseMinAddress can be greater than default but not less than.
1528
      if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1529
        if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1530
          // matches compressed oops printing flags
1531
          log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1532
                                     " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1533
                                     DefaultHeapBaseMinAddress,
1534
                                     DefaultHeapBaseMinAddress/G,
1535
                                     HeapBaseMinAddress);
1536
          FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1537
        }
1538
      }
1539
    }
1540
    if (UseCompressedOops) {
1541
      // Limit the heap size to the maximum possible when using compressed oops
1542
      julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1543

1544
      if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1545
        // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1546
        // but it should be not less than default MaxHeapSize.
1547
        max_coop_heap -= HeapBaseMinAddress;
1548
      }
1549

1550
      // If user specified flags prioritizing os physical
1551
      // memory limits, then disable compressed oops if
1552
      // limits exceed max_coop_heap and UseCompressedOops
1553
      // was not specified.
1554
      if (reasonable_max > max_coop_heap) {
1555
        if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1556
          log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1557
            " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1558
            "Please check the setting of MaxRAMPercentage %5.2f."
1559
            ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1560
          FLAG_SET_ERGO(UseCompressedOops, false);
1561
        } else {
1562
          reasonable_max = MIN2(reasonable_max, max_coop_heap);
1563
        }
1564
      }
1565
    }
1566
#endif // _LP64
1567

1568
    log_trace(gc, heap)("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1569
    FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1570
  }
1571

1572
  // If the minimum or initial heap_size have not been set or requested to be set
1573
  // ergonomically, set them accordingly.
1574
  if (InitialHeapSize == 0 || MinHeapSize == 0) {
1575
    julong reasonable_minimum = (julong)(OldSize + NewSize);
1576

1577
    reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1578

1579
    reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1580

1581
    if (InitialHeapSize == 0) {
1582
      julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1583
      reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1584

1585
      reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1586
      reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1587

1588
      FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1589
      log_trace(gc, heap)("  Initial heap size " SIZE_FORMAT, InitialHeapSize);
1590
    }
1591
    // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1592
    // synchronize with InitialHeapSize to avoid errors with the default value.
1593
    if (MinHeapSize == 0) {
1594
      FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1595
      log_trace(gc, heap)("  Minimum heap size " SIZE_FORMAT, MinHeapSize);
1596
    }
1597
  }
1598
}
1599

1600
// This option inspects the machine and attempts to set various
1601
// parameters to be optimal for long-running, memory allocation
1602
// intensive jobs.  It is intended for machines with large
1603
// amounts of cpu and memory.
1604
jint Arguments::set_aggressive_heap_flags() {
1605
  // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1606
  // VM, but we may not be able to represent the total physical memory
1607
  // available (like having 8gb of memory on a box but using a 32bit VM).
1608
  // Thus, we need to make sure we're using a julong for intermediate
1609
  // calculations.
1610
  julong initHeapSize;
1611
  julong total_memory = os::physical_memory();
1612

1613
  if (total_memory < (julong) 256 * M) {
1614
    jio_fprintf(defaultStream::error_stream(),
1615
            "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1616
    vm_exit(1);
1617
  }
1618

1619
  // The heap size is half of available memory, or (at most)
1620
  // all of possible memory less 160mb (leaving room for the OS
1621
  // when using ISM).  This is the maximum; because adaptive sizing
1622
  // is turned on below, the actual space used may be smaller.
1623

1624
  initHeapSize = MIN2(total_memory / (julong) 2,
1625
          total_memory - (julong) 160 * M);
1626

1627
  initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1628

1629
  if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1630
    if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1631
      return JNI_EINVAL;
1632
    }
1633
    if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1634
      return JNI_EINVAL;
1635
    }
1636
    if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1637
      return JNI_EINVAL;
1638
    }
1639
  }
1640
  if (FLAG_IS_DEFAULT(NewSize)) {
1641
    // Make the young generation 3/8ths of the total heap.
1642
    if (FLAG_SET_CMDLINE(NewSize,
1643
            ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1644
      return JNI_EINVAL;
1645
    }
1646
    if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1647
      return JNI_EINVAL;
1648
    }
1649
  }
1650

1651
#if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
1652
  FLAG_SET_DEFAULT(UseLargePages, true);
1653
#endif
1654

1655
  // Increase some data structure sizes for efficiency
1656
  if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1657
    return JNI_EINVAL;
1658
  }
1659
  if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1660
    return JNI_EINVAL;
1661
  }
1662
  if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1663
    return JNI_EINVAL;
1664
  }
1665

1666
  // See the OldPLABSize comment below, but replace 'after promotion'
1667
  // with 'after copying'.  YoungPLABSize is the size of the survivor
1668
  // space per-gc-thread buffers.  The default is 4kw.
1669
  if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1670
    return JNI_EINVAL;
1671
  }
1672

1673
  // OldPLABSize is the size of the buffers in the old gen that
1674
  // UseParallelGC uses to promote live data that doesn't fit in the
1675
  // survivor spaces.  At any given time, there's one for each gc thread.
1676
  // The default size is 1kw. These buffers are rarely used, since the
1677
  // survivor spaces are usually big enough.  For specjbb, however, there
1678
  // are occasions when there's lots of live data in the young gen
1679
  // and we end up promoting some of it.  We don't have a definite
1680
  // explanation for why bumping OldPLABSize helps, but the theory
1681
  // is that a bigger PLAB results in retaining something like the
1682
  // original allocation order after promotion, which improves mutator
1683
  // locality.  A minor effect may be that larger PLABs reduce the
1684
  // number of PLAB allocation events during gc.  The value of 8kw
1685
  // was arrived at by experimenting with specjbb.
1686
  if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1687
    return JNI_EINVAL;
1688
  }
1689

1690
  // Enable parallel GC and adaptive generation sizing
1691
  if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1692
    return JNI_EINVAL;
1693
  }
1694

1695
  // Encourage steady state memory management
1696
  if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1697
    return JNI_EINVAL;
1698
  }
1699

1700
  return JNI_OK;
1701
}
1702

1703
// This must be called after ergonomics.
1704
void Arguments::set_bytecode_flags() {
1705
  if (!RewriteBytecodes) {
1706
    FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1707
  }
1708
}
1709

1710
// Aggressive optimization flags
1711
jint Arguments::set_aggressive_opts_flags() {
1712
#ifdef COMPILER2
1713
  if (AggressiveUnboxing) {
1714
    if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1715
      FLAG_SET_DEFAULT(EliminateAutoBox, true);
1716
    } else if (!EliminateAutoBox) {
1717
      // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1718
      AggressiveUnboxing = false;
1719
    }
1720
    if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1721
      FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1722
    } else if (!DoEscapeAnalysis) {
1723
      // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1724
      AggressiveUnboxing = false;
1725
    }
1726
  }
1727
  if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1728
    if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1729
      FLAG_SET_DEFAULT(EliminateAutoBox, true);
1730
    }
1731
    // Feed the cache size setting into the JDK
1732
    char buffer[1024];
1733
    jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1734
    if (!add_property(buffer)) {
1735
      return JNI_ENOMEM;
1736
    }
1737
  }
1738
#endif
1739

1740
  return JNI_OK;
1741
}
1742

1743
//===========================================================================================================
1744

1745
void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1746
  if (_sun_java_launcher != _default_java_launcher) {
1747
    os::free(const_cast<char*>(_sun_java_launcher));
1748
  }
1749
  _sun_java_launcher = os::strdup_check_oom(launcher);
1750
}
1751

1752
bool Arguments::created_by_java_launcher() {
1753
  assert(_sun_java_launcher != nullptr, "property must have value");
1754
  return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1755
}
1756

1757
bool Arguments::sun_java_launcher_is_altjvm() {
1758
  return _sun_java_launcher_is_altjvm;
1759
}
1760

1761
//===========================================================================================================
1762
// Parsing of main arguments
1763

1764
unsigned int addreads_count = 0;
1765
unsigned int addexports_count = 0;
1766
unsigned int addopens_count = 0;
1767
unsigned int addmods_count = 0;
1768
unsigned int patch_mod_count = 0;
1769
unsigned int enable_native_access_count = 0;
1770

1771
// Check the consistency of vm_init_args
1772
bool Arguments::check_vm_args_consistency() {
1773
  // Method for adding checks for flag consistency.
1774
  // The intent is to warn the user of all possible conflicts,
1775
  // before returning an error.
1776
  // Note: Needs platform-dependent factoring.
1777
  bool status = true;
1778

1779
  if (TLABRefillWasteFraction == 0) {
1780
    jio_fprintf(defaultStream::error_stream(),
1781
                "TLABRefillWasteFraction should be a denominator, "
1782
                "not " SIZE_FORMAT "\n",
1783
                TLABRefillWasteFraction);
1784
    status = false;
1785
  }
1786

1787
  status = CompilerConfig::check_args_consistency(status);
1788
#if INCLUDE_JVMCI
1789
  if (status && EnableJVMCI) {
1790
    PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1791
        AddProperty, UnwriteableProperty, InternalProperty);
1792
    if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1793
      if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1794
        return false;
1795
      }
1796
    }
1797
  }
1798
#endif
1799

1800
#if INCLUDE_JFR
1801
  if (status && (FlightRecorderOptions || StartFlightRecording)) {
1802
    if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1803
      return false;
1804
    }
1805
  }
1806
#endif
1807

1808
#ifndef SUPPORT_RESERVED_STACK_AREA
1809
  if (StackReservedPages != 0) {
1810
    FLAG_SET_CMDLINE(StackReservedPages, 0);
1811
    warning("Reserved Stack Area not supported on this platform");
1812
  }
1813
#endif
1814

1815
#if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1816
  if (LockingMode == LM_LIGHTWEIGHT) {
1817
    FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1818
    warning("New lightweight locking not supported on this platform");
1819
  }
1820
#endif
1821

1822
#if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1823
  if (LockingMode == LM_MONITOR) {
1824
    jio_fprintf(defaultStream::error_stream(),
1825
                "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1826
    return false;
1827
  }
1828
#endif
1829
  if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1830
    jio_fprintf(defaultStream::error_stream(),
1831
                "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1832
    return false;
1833
  }
1834
  return status;
1835
}
1836

1837
bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1838
  const char* option_type) {
1839
  if (ignore) return false;
1840

1841
  const char* spacer = " ";
1842
  if (option_type == nullptr) {
1843
    option_type = ++spacer; // Set both to the empty string.
1844
  }
1845

1846
  jio_fprintf(defaultStream::error_stream(),
1847
              "Unrecognized %s%soption: %s\n", option_type, spacer,
1848
              option->optionString);
1849
  return true;
1850
}
1851

1852
static const char* user_assertion_options[] = {
1853
  "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1854
};
1855

1856
static const char* system_assertion_options[] = {
1857
  "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1858
};
1859

1860
bool Arguments::parse_uint(const char* value,
1861
                           uint* uint_arg,
1862
                           uint min_size) {
1863
  uint n;
1864
  if (!parse_integer(value, &n)) {
1865
    return false;
1866
  }
1867
  if (n >= min_size) {
1868
    *uint_arg = n;
1869
    return true;
1870
  } else {
1871
    return false;
1872
  }
1873
}
1874

1875
bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1876
  assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1877
  CDSConfig::check_internal_module_property(prop_name, prop_value);
1878
  size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1879
  char* property = AllocateHeap(prop_len, mtArguments);
1880
  int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1881
  if (ret < 0 || ret >= (int)prop_len) {
1882
    FreeHeap(property);
1883
    return false;
1884
  }
1885
  // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1886
  // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1887
  // that multiple occurrences of the associated flag just causes the existing property value to be
1888
  // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1889
  // to a property after we have finished flag processing.
1890
  bool added = add_property(property, WriteableProperty, internal);
1891
  FreeHeap(property);
1892
  return added;
1893
}
1894

1895
bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1896
  assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1897
  CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1898
  const unsigned int props_count_limit = 1000;
1899
  const int max_digits = 3;
1900
  const int extra_symbols_count = 3; // includes '.', '=', '\0'
1901

1902
  // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1903
  if (count < props_count_limit) {
1904
    size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1905
    char* property = AllocateHeap(prop_len, mtArguments);
1906
    int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1907
    if (ret < 0 || ret >= (int)prop_len) {
1908
      FreeHeap(property);
1909
      jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1910
      return false;
1911
    }
1912
    bool added = add_property(property, UnwriteableProperty, InternalProperty);
1913
    FreeHeap(property);
1914
    return added;
1915
  }
1916

1917
  jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1918
  return false;
1919
}
1920

1921
Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1922
                                                  julong* long_arg,
1923
                                                  julong min_size,
1924
                                                  julong max_size) {
1925
  if (!parse_integer(s, long_arg)) return arg_unreadable;
1926
  return check_memory_size(*long_arg, min_size, max_size);
1927
}
1928

1929
// Parse JavaVMInitArgs structure
1930

1931
jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1932
                                   const JavaVMInitArgs *java_tool_options_args,
1933
                                   const JavaVMInitArgs *java_options_args,
1934
                                   const JavaVMInitArgs *cmd_line_args) {
1935
  bool patch_mod_javabase = false;
1936

1937
  // Save default settings for some mode flags
1938
  Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1939
  Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
1940
  Arguments::_ClipInlining             = ClipInlining;
1941
  Arguments::_BackgroundCompilation    = BackgroundCompilation;
1942

1943
  // Remember the default value of SharedBaseAddress.
1944
  Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1945

1946
  // Setup flags for mixed which is the default
1947
  set_mode_flags(_mixed);
1948

1949
  // Parse args structure generated from java.base vm options resource
1950
  jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1951
  if (result != JNI_OK) {
1952
    return result;
1953
  }
1954

1955
  // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1956
  // variable (if present).
1957
  result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1958
  if (result != JNI_OK) {
1959
    return result;
1960
  }
1961

1962
  // Parse args structure generated from the command line flags.
1963
  result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1964
  if (result != JNI_OK) {
1965
    return result;
1966
  }
1967

1968
  // Parse args structure generated from the _JAVA_OPTIONS environment
1969
  // variable (if present) (mimics classic VM)
1970
  result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1971
  if (result != JNI_OK) {
1972
    return result;
1973
  }
1974

1975
  // Disable CDS for exploded image
1976
  if (!has_jimage()) {
1977
    no_shared_spaces("CDS disabled on exploded JDK");
1978
  }
1979

1980
  // We need to ensure processor and memory resources have been properly
1981
  // configured - which may rely on arguments we just processed - before
1982
  // doing the final argument processing. Any argument processing that
1983
  // needs to know about processor and memory resources must occur after
1984
  // this point.
1985

1986
  os::init_container_support();
1987

1988
  SystemMemoryBarrier::initialize();
1989

1990
  // Do final processing now that all arguments have been parsed
1991
  result = finalize_vm_init_args(patch_mod_javabase);
1992
  if (result != JNI_OK) {
1993
    return result;
1994
  }
1995

1996
  return JNI_OK;
1997
}
1998

1999
#if !INCLUDE_JVMTI
2000
// Checks if name in command-line argument -agent{lib,path}:name[=options]
2001
// represents a valid JDWP agent.  is_path==true denotes that we
2002
// are dealing with -agentpath (case where name is a path), otherwise with
2003
// -agentlib
2004
static bool valid_jdwp_agent(char *name, bool is_path) {
2005
  char *_name;
2006
  const char *_jdwp = "jdwp";
2007
  size_t _len_jdwp, _len_prefix;
2008

2009
  if (is_path) {
2010
    if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2011
      return false;
2012
    }
2013

2014
    _name++;  // skip past last path separator
2015
    _len_prefix = strlen(JNI_LIB_PREFIX);
2016

2017
    if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2018
      return false;
2019
    }
2020

2021
    _name += _len_prefix;
2022
    _len_jdwp = strlen(_jdwp);
2023

2024
    if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2025
      _name += _len_jdwp;
2026
    }
2027
    else {
2028
      return false;
2029
    }
2030

2031
    if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2032
      return false;
2033
    }
2034

2035
    return true;
2036
  }
2037

2038
  if (strcmp(name, _jdwp) == 0) {
2039
    return true;
2040
  }
2041

2042
  return false;
2043
}
2044
#endif
2045

2046
int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2047
  // --patch-module=<module>=<file>(<pathsep><file>)*
2048
  assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2049
  // Find the equal sign between the module name and the path specification
2050
  const char* module_equal = strchr(patch_mod_tail, '=');
2051
  if (module_equal == nullptr) {
2052
    jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2053
    return JNI_ERR;
2054
  } else {
2055
    // Pick out the module name
2056
    size_t module_len = module_equal - patch_mod_tail;
2057
    char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2058
    if (module_name != nullptr) {
2059
      memcpy(module_name, patch_mod_tail, module_len);
2060
      *(module_name + module_len) = '\0';
2061
      // The path piece begins one past the module_equal sign
2062
      add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2063
      FREE_C_HEAP_ARRAY(char, module_name);
2064
      if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2065
        return JNI_ENOMEM;
2066
      }
2067
    } else {
2068
      return JNI_ENOMEM;
2069
    }
2070
  }
2071
  return JNI_OK;
2072
}
2073

2074
// Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2075
jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2076
  // The min and max sizes match the values in globals.hpp, but scaled
2077
  // with K. The values have been chosen so that alignment with page
2078
  // size doesn't change the max value, which makes the conversions
2079
  // back and forth between Xss value and ThreadStackSize value easier.
2080
  // The values have also been chosen to fit inside a 32-bit signed type.
2081
  const julong min_ThreadStackSize = 0;
2082
  const julong max_ThreadStackSize = 1 * M;
2083

2084
  // Make sure the above values match the range set in globals.hpp
2085
  const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2086
  assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2087
  assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2088

2089
  const julong min_size = min_ThreadStackSize * K;
2090
  const julong max_size = max_ThreadStackSize * K;
2091

2092
  assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2093

2094
  julong size = 0;
2095
  ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2096
  if (errcode != arg_in_range) {
2097
    bool silent = (option == nullptr); // Allow testing to silence error messages
2098
    if (!silent) {
2099
      jio_fprintf(defaultStream::error_stream(),
2100
                  "Invalid thread stack size: %s\n", option->optionString);
2101
      describe_range_error(errcode);
2102
    }
2103
    return JNI_EINVAL;
2104
  }
2105

2106
  // Internally track ThreadStackSize in units of 1024 bytes.
2107
  const julong size_aligned = align_up(size, K);
2108
  assert(size <= size_aligned,
2109
         "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2110
         size, size_aligned);
2111

2112
  const julong size_in_K = size_aligned / K;
2113
  assert(size_in_K < (julong)max_intx,
2114
         "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2115
         size_in_K);
2116

2117
  // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2118
  const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2119
  assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2120
         "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2121
         max_expanded, size_in_K);
2122

2123
  *out_ThreadStackSize = (intx)size_in_K;
2124

2125
  return JNI_OK;
2126
}
2127

2128
jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2129
  // For match_option to return remaining or value part of option string
2130
  const char* tail;
2131

2132
  // iterate over arguments
2133
  for (int index = 0; index < args->nOptions; index++) {
2134
    bool is_absolute_path = false;  // for -agentpath vs -agentlib
2135

2136
    const JavaVMOption* option = args->options + index;
2137

2138
    if (!match_option(option, "-Djava.class.path", &tail) &&
2139
        !match_option(option, "-Dsun.java.command", &tail) &&
2140
        !match_option(option, "-Dsun.java.launcher", &tail)) {
2141

2142
        // add all jvm options to the jvm_args string. This string
2143
        // is used later to set the java.vm.args PerfData string constant.
2144
        // the -Djava.class.path and the -Dsun.java.command options are
2145
        // omitted from jvm_args string as each have their own PerfData
2146
        // string constant object.
2147
        build_jvm_args(option->optionString);
2148
    }
2149

2150
    // -verbose:[class/module/gc/jni]
2151
    if (match_option(option, "-verbose", &tail)) {
2152
      if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2153
        LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2154
        LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2155
      } else if (!strcmp(tail, ":module")) {
2156
        LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2157
        LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2158
      } else if (!strcmp(tail, ":gc")) {
2159
        if (_legacyGCLogging.lastFlag == 0) {
2160
          _legacyGCLogging.lastFlag = 1;
2161
        }
2162
      } else if (!strcmp(tail, ":jni")) {
2163
        LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2164
      }
2165
    // -da / -ea / -disableassertions / -enableassertions
2166
    // These accept an optional class/package name separated by a colon, e.g.,
2167
    // -da:java.lang.Thread.
2168
    } else if (match_option(option, user_assertion_options, &tail, true)) {
2169
      bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2170
      if (*tail == '\0') {
2171
        JavaAssertions::setUserClassDefault(enable);
2172
      } else {
2173
        assert(*tail == ':', "bogus match by match_option()");
2174
        JavaAssertions::addOption(tail + 1, enable);
2175
      }
2176
    // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2177
    } else if (match_option(option, system_assertion_options, &tail, false)) {
2178
      bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2179
      JavaAssertions::setSystemClassDefault(enable);
2180
    // -bootclasspath:
2181
    } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2182
        jio_fprintf(defaultStream::output_stream(),
2183
          "-Xbootclasspath is no longer a supported option.\n");
2184
        return JNI_EINVAL;
2185
    // -bootclasspath/a:
2186
    } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2187
      Arguments::append_sysclasspath(tail);
2188
    // -bootclasspath/p:
2189
    } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2190
        jio_fprintf(defaultStream::output_stream(),
2191
          "-Xbootclasspath/p is no longer a supported option.\n");
2192
        return JNI_EINVAL;
2193
    // -Xrun
2194
    } else if (match_option(option, "-Xrun", &tail)) {
2195
      if (tail != nullptr) {
2196
        const char* pos = strchr(tail, ':');
2197
        size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2198
        char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2199
        jio_snprintf(name, len + 1, "%s", tail);
2200

2201
        char *options = nullptr;
2202
        if(pos != nullptr) {
2203
          size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2204
          options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2205
        }
2206
#if !INCLUDE_JVMTI
2207
        if (strcmp(name, "jdwp") == 0) {
2208
          jio_fprintf(defaultStream::error_stream(),
2209
            "Debugging agents are not supported in this VM\n");
2210
          return JNI_ERR;
2211
        }
2212
#endif // !INCLUDE_JVMTI
2213
        JvmtiAgentList::add_xrun(name, options, false);
2214
        FREE_C_HEAP_ARRAY(char, name);
2215
        FREE_C_HEAP_ARRAY(char, options);
2216
      }
2217
    } else if (match_option(option, "--add-reads=", &tail)) {
2218
      if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2219
        return JNI_ENOMEM;
2220
      }
2221
    } else if (match_option(option, "--add-exports=", &tail)) {
2222
      if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2223
        return JNI_ENOMEM;
2224
      }
2225
    } else if (match_option(option, "--add-opens=", &tail)) {
2226
      if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2227
        return JNI_ENOMEM;
2228
      }
2229
    } else if (match_option(option, "--add-modules=", &tail)) {
2230
      if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2231
        return JNI_ENOMEM;
2232
      }
2233
    } else if (match_option(option, "--enable-native-access=", &tail)) {
2234
      if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2235
        return JNI_ENOMEM;
2236
      }
2237
    } else if (match_option(option, "--limit-modules=", &tail)) {
2238
      if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2239
        return JNI_ENOMEM;
2240
      }
2241
    } else if (match_option(option, "--module-path=", &tail)) {
2242
      if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2243
        return JNI_ENOMEM;
2244
      }
2245
    } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2246
      if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2247
        return JNI_ENOMEM;
2248
      }
2249
    } else if (match_option(option, "--patch-module=", &tail)) {
2250
      // --patch-module=<module>=<file>(<pathsep><file>)*
2251
      int res = process_patch_mod_option(tail, patch_mod_javabase);
2252
      if (res != JNI_OK) {
2253
        return res;
2254
      }
2255
    } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2256
      if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2257
        PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2258
                                AddProperty, WriteableProperty, InternalProperty);
2259
      } else {
2260
        jio_fprintf(defaultStream::error_stream(),
2261
                    "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2262
        return JNI_ERR;
2263
      }
2264
    } else if (match_option(option, "--illegal-access=", &tail)) {
2265
      char version[256];
2266
      JDK_Version::jdk(17).to_string(version, sizeof(version));
2267
      warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2268
    // -agentlib and -agentpath
2269
    } else if (match_option(option, "-agentlib:", &tail) ||
2270
          (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2271
      if(tail != nullptr) {
2272
        const char* pos = strchr(tail, '=');
2273
        char* name;
2274
        if (pos == nullptr) {
2275
          name = os::strdup_check_oom(tail, mtArguments);
2276
        } else {
2277
          size_t len = pos - tail;
2278
          name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2279
          memcpy(name, tail, len);
2280
          name[len] = '\0';
2281
        }
2282

2283
        char *options = nullptr;
2284
        if(pos != nullptr) {
2285
          options = os::strdup_check_oom(pos + 1, mtArguments);
2286
        }
2287
#if !INCLUDE_JVMTI
2288
        if (valid_jdwp_agent(name, is_absolute_path)) {
2289
          jio_fprintf(defaultStream::error_stream(),
2290
            "Debugging agents are not supported in this VM\n");
2291
          return JNI_ERR;
2292
        }
2293
#endif // !INCLUDE_JVMTI
2294
        JvmtiAgentList::add(name, options, is_absolute_path);
2295
        os::free(name);
2296
        os::free(options);
2297
      }
2298
    // -javaagent
2299
    } else if (match_option(option, "-javaagent:", &tail)) {
2300
#if !INCLUDE_JVMTI
2301
      jio_fprintf(defaultStream::error_stream(),
2302
        "Instrumentation agents are not supported in this VM\n");
2303
      return JNI_ERR;
2304
#else
2305
      if (tail != nullptr) {
2306
        size_t length = strlen(tail) + 1;
2307
        char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2308
        jio_snprintf(options, length, "%s", tail);
2309
        JvmtiAgentList::add("instrument", options, false);
2310
        FREE_C_HEAP_ARRAY(char, options);
2311

2312
        // java agents need module java.instrument
2313
        if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2314
          return JNI_ENOMEM;
2315
        }
2316
      }
2317
#endif // !INCLUDE_JVMTI
2318
    // --enable_preview
2319
    } else if (match_option(option, "--enable-preview")) {
2320
      set_enable_preview();
2321
    // -Xnoclassgc
2322
    } else if (match_option(option, "-Xnoclassgc")) {
2323
      if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2324
        return JNI_EINVAL;
2325
      }
2326
    // -Xbatch
2327
    } else if (match_option(option, "-Xbatch")) {
2328
      if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2329
        return JNI_EINVAL;
2330
      }
2331
    // -Xmn for compatibility with other JVM vendors
2332
    } else if (match_option(option, "-Xmn", &tail)) {
2333
      julong long_initial_young_size = 0;
2334
      ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2335
      if (errcode != arg_in_range) {
2336
        jio_fprintf(defaultStream::error_stream(),
2337
                    "Invalid initial young generation size: %s\n", option->optionString);
2338
        describe_range_error(errcode);
2339
        return JNI_EINVAL;
2340
      }
2341
      if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2342
        return JNI_EINVAL;
2343
      }
2344
      if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2345
        return JNI_EINVAL;
2346
      }
2347
    // -Xms
2348
    } else if (match_option(option, "-Xms", &tail)) {
2349
      julong size = 0;
2350
      // an initial heap size of 0 means automatically determine
2351
      ArgsRange errcode = parse_memory_size(tail, &size, 0);
2352
      if (errcode != arg_in_range) {
2353
        jio_fprintf(defaultStream::error_stream(),
2354
                    "Invalid initial heap size: %s\n", option->optionString);
2355
        describe_range_error(errcode);
2356
        return JNI_EINVAL;
2357
      }
2358
      if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2359
        return JNI_EINVAL;
2360
      }
2361
      if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2362
        return JNI_EINVAL;
2363
      }
2364
    // -Xmx
2365
    } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2366
      julong long_max_heap_size = 0;
2367
      ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2368
      if (errcode != arg_in_range) {
2369
        jio_fprintf(defaultStream::error_stream(),
2370
                    "Invalid maximum heap size: %s\n", option->optionString);
2371
        describe_range_error(errcode);
2372
        return JNI_EINVAL;
2373
      }
2374
      if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2375
        return JNI_EINVAL;
2376
      }
2377
    // Xmaxf
2378
    } else if (match_option(option, "-Xmaxf", &tail)) {
2379
      char* err;
2380
      int maxf = (int)(strtod(tail, &err) * 100);
2381
      if (*err != '\0' || *tail == '\0') {
2382
        jio_fprintf(defaultStream::error_stream(),
2383
                    "Bad max heap free percentage size: %s\n",
2384
                    option->optionString);
2385
        return JNI_EINVAL;
2386
      } else {
2387
        if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2388
            return JNI_EINVAL;
2389
        }
2390
      }
2391
    // Xminf
2392
    } else if (match_option(option, "-Xminf", &tail)) {
2393
      char* err;
2394
      int minf = (int)(strtod(tail, &err) * 100);
2395
      if (*err != '\0' || *tail == '\0') {
2396
        jio_fprintf(defaultStream::error_stream(),
2397
                    "Bad min heap free percentage size: %s\n",
2398
                    option->optionString);
2399
        return JNI_EINVAL;
2400
      } else {
2401
        if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2402
          return JNI_EINVAL;
2403
        }
2404
      }
2405
    // -Xss
2406
    } else if (match_option(option, "-Xss", &tail)) {
2407
      intx value = 0;
2408
      jint err = parse_xss(option, tail, &value);
2409
      if (err != JNI_OK) {
2410
        return err;
2411
      }
2412
      if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2413
        return JNI_EINVAL;
2414
      }
2415
    } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2416
               match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2417
      julong long_ReservedCodeCacheSize = 0;
2418

2419
      ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2420
      if (errcode != arg_in_range) {
2421
        jio_fprintf(defaultStream::error_stream(),
2422
                    "Invalid maximum code cache size: %s.\n", option->optionString);
2423
        return JNI_EINVAL;
2424
      }
2425
      if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2426
        return JNI_EINVAL;
2427
      }
2428
    // -green
2429
    } else if (match_option(option, "-green")) {
2430
      jio_fprintf(defaultStream::error_stream(),
2431
                  "Green threads support not available\n");
2432
          return JNI_EINVAL;
2433
    // -native
2434
    } else if (match_option(option, "-native")) {
2435
          // HotSpot always uses native threads, ignore silently for compatibility
2436
    // -Xrs
2437
    } else if (match_option(option, "-Xrs")) {
2438
          // Classic/EVM option, new functionality
2439
      if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2440
        return JNI_EINVAL;
2441
      }
2442
      // -Xprof
2443
    } else if (match_option(option, "-Xprof")) {
2444
      char version[256];
2445
      // Obsolete in JDK 10
2446
      JDK_Version::jdk(10).to_string(version, sizeof(version));
2447
      warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2448
    // -Xinternalversion
2449
    } else if (match_option(option, "-Xinternalversion")) {
2450
      jio_fprintf(defaultStream::output_stream(), "%s\n",
2451
                  VM_Version::internal_vm_info_string());
2452
      vm_exit(0);
2453
#ifndef PRODUCT
2454
    // -Xprintflags
2455
    } else if (match_option(option, "-Xprintflags")) {
2456
      JVMFlag::printFlags(tty, false);
2457
      vm_exit(0);
2458
#endif
2459
    // -D
2460
    } else if (match_option(option, "-D", &tail)) {
2461
      const char* value;
2462
      if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2463
            *value!= '\0' && strcmp(value, "\"\"") != 0) {
2464
        // abort if -Djava.endorsed.dirs is set
2465
        jio_fprintf(defaultStream::output_stream(),
2466
          "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2467
          "in modular form will be supported via the concept of upgradeable modules.\n", value);
2468
        return JNI_EINVAL;
2469
      }
2470
      if (match_option(option, "-Djava.ext.dirs=", &value) &&
2471
            *value != '\0' && strcmp(value, "\"\"") != 0) {
2472
        // abort if -Djava.ext.dirs is set
2473
        jio_fprintf(defaultStream::output_stream(),
2474
          "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
2475
        return JNI_EINVAL;
2476
      }
2477
      // Check for module related properties.  They must be set using the modules
2478
      // options. For example: use "--add-modules=java.sql", not
2479
      // "-Djdk.module.addmods=java.sql"
2480
      if (is_internal_module_property(option->optionString + 2)) {
2481
        needs_module_property_warning = true;
2482
        continue;
2483
      }
2484
      if (!add_property(tail)) {
2485
        return JNI_ENOMEM;
2486
      }
2487
      // Out of the box management support
2488
      if (match_option(option, "-Dcom.sun.management", &tail)) {
2489
#if INCLUDE_MANAGEMENT
2490
        if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2491
          return JNI_EINVAL;
2492
        }
2493
        // management agent in module jdk.management.agent
2494
        if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2495
          return JNI_ENOMEM;
2496
        }
2497
#else
2498
        jio_fprintf(defaultStream::output_stream(),
2499
          "-Dcom.sun.management is not supported in this VM.\n");
2500
        return JNI_ERR;
2501
#endif
2502
      }
2503
    // -Xint
2504
    } else if (match_option(option, "-Xint")) {
2505
          set_mode_flags(_int);
2506
          mode_flag_cmd_line = true;
2507
    // -Xmixed
2508
    } else if (match_option(option, "-Xmixed")) {
2509
          set_mode_flags(_mixed);
2510
          mode_flag_cmd_line = true;
2511
    // -Xcomp
2512
    } else if (match_option(option, "-Xcomp")) {
2513
      // for testing the compiler; turn off all flags that inhibit compilation
2514
          set_mode_flags(_comp);
2515
          mode_flag_cmd_line = true;
2516
    // -Xshare:dump
2517
    } else if (match_option(option, "-Xshare:dump")) {
2518
      CDSConfig::enable_dumping_static_archive();
2519
    // -Xshare:on
2520
    } else if (match_option(option, "-Xshare:on")) {
2521
      UseSharedSpaces = true;
2522
      RequireSharedSpaces = true;
2523
    // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2524
    } else if (match_option(option, "-Xshare:auto")) {
2525
      UseSharedSpaces = true;
2526
      RequireSharedSpaces = false;
2527
      xshare_auto_cmd_line = true;
2528
    // -Xshare:off
2529
    } else if (match_option(option, "-Xshare:off")) {
2530
      UseSharedSpaces = false;
2531
      RequireSharedSpaces = false;
2532
    // -Xverify
2533
    } else if (match_option(option, "-Xverify", &tail)) {
2534
      if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2535
        if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2536
          return JNI_EINVAL;
2537
        }
2538
        if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2539
          return JNI_EINVAL;
2540
        }
2541
      } else if (strcmp(tail, ":remote") == 0) {
2542
        if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2543
          return JNI_EINVAL;
2544
        }
2545
        if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2546
          return JNI_EINVAL;
2547
        }
2548
      } else if (strcmp(tail, ":none") == 0) {
2549
        if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2550
          return JNI_EINVAL;
2551
        }
2552
        if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2553
          return JNI_EINVAL;
2554
        }
2555
        warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2556
      } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2557
        return JNI_EINVAL;
2558
      }
2559
    // -Xdebug
2560
    } else if (match_option(option, "-Xdebug")) {
2561
      warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2562
    } else if (match_option(option, "-Xloggc:", &tail)) {
2563
      // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2564
      log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2565
      _legacyGCLogging.lastFlag = 2;
2566
      _legacyGCLogging.file = os::strdup_check_oom(tail);
2567
    } else if (match_option(option, "-Xlog", &tail)) {
2568
      bool ret = false;
2569
      if (strcmp(tail, ":help") == 0) {
2570
        fileStream stream(defaultStream::output_stream());
2571
        LogConfiguration::print_command_line_help(&stream);
2572
        vm_exit(0);
2573
      } else if (strcmp(tail, ":disable") == 0) {
2574
        LogConfiguration::disable_logging();
2575
        ret = true;
2576
      } else if (strcmp(tail, ":async") == 0) {
2577
        LogConfiguration::set_async_mode(true);
2578
        ret = true;
2579
      } else if (*tail == '\0') {
2580
        ret = LogConfiguration::parse_command_line_arguments();
2581
        assert(ret, "-Xlog without arguments should never fail to parse");
2582
      } else if (*tail == ':') {
2583
        ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2584
      }
2585
      if (ret == false) {
2586
        jio_fprintf(defaultStream::error_stream(),
2587
                    "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2588
                    tail);
2589
        return JNI_EINVAL;
2590
      }
2591
    // JNI hooks
2592
    } else if (match_option(option, "-Xcheck", &tail)) {
2593
      if (!strcmp(tail, ":jni")) {
2594
#if !INCLUDE_JNI_CHECK
2595
        warning("JNI CHECKING is not supported in this VM");
2596
#else
2597
        CheckJNICalls = true;
2598
#endif // INCLUDE_JNI_CHECK
2599
      } else if (is_bad_option(option, args->ignoreUnrecognized,
2600
                                     "check")) {
2601
        return JNI_EINVAL;
2602
      }
2603
    } else if (match_option(option, "vfprintf")) {
2604
      _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2605
    } else if (match_option(option, "exit")) {
2606
      _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2607
    } else if (match_option(option, "abort")) {
2608
      _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2609
    // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2610
    // and the last option wins.
2611
    } else if (match_option(option, "-XX:+NeverTenure")) {
2612
      if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2613
        return JNI_EINVAL;
2614
      }
2615
      if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2616
        return JNI_EINVAL;
2617
      }
2618
      if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2619
        return JNI_EINVAL;
2620
      }
2621
    } else if (match_option(option, "-XX:+AlwaysTenure")) {
2622
      if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2623
        return JNI_EINVAL;
2624
      }
2625
      if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2626
        return JNI_EINVAL;
2627
      }
2628
      if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2629
        return JNI_EINVAL;
2630
      }
2631
    } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2632
      uint max_tenuring_thresh = 0;
2633
      if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2634
        jio_fprintf(defaultStream::error_stream(),
2635
                    "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2636
        return JNI_EINVAL;
2637
      }
2638

2639
      if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2640
        return JNI_EINVAL;
2641
      }
2642

2643
      if (MaxTenuringThreshold == 0) {
2644
        if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2645
          return JNI_EINVAL;
2646
        }
2647
        if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2648
          return JNI_EINVAL;
2649
        }
2650
      } else {
2651
        if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2652
          return JNI_EINVAL;
2653
        }
2654
        if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2655
          return JNI_EINVAL;
2656
        }
2657
      }
2658
    } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2659
      if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2660
        return JNI_EINVAL;
2661
      }
2662
      if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2663
        return JNI_EINVAL;
2664
      }
2665
    } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2666
      if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2667
        return JNI_EINVAL;
2668
      }
2669
      if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2670
        return JNI_EINVAL;
2671
      }
2672
    } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2673
      if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2674
        return JNI_EINVAL;
2675
      }
2676
      if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2677
        return JNI_EINVAL;
2678
      }
2679
    } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2680
      if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2681
        return JNI_EINVAL;
2682
      }
2683
      if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2684
        return JNI_EINVAL;
2685
      }
2686
    } else if (match_option(option, "--finalization=", &tail)) {
2687
      if (strcmp(tail, "enabled") == 0) {
2688
        InstanceKlass::set_finalization_enabled(true);
2689
      } else if (strcmp(tail, "disabled") == 0) {
2690
        InstanceKlass::set_finalization_enabled(false);
2691
      } else {
2692
        jio_fprintf(defaultStream::error_stream(),
2693
                    "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2694
                    tail);
2695
        return JNI_EINVAL;
2696
      }
2697
#if !defined(DTRACE_ENABLED)
2698
    } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2699
      jio_fprintf(defaultStream::error_stream(),
2700
                  "DTraceMethodProbes flag is not applicable for this configuration\n");
2701
      return JNI_EINVAL;
2702
    } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2703
      jio_fprintf(defaultStream::error_stream(),
2704
                  "DTraceAllocProbes flag is not applicable for this configuration\n");
2705
      return JNI_EINVAL;
2706
    } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2707
      jio_fprintf(defaultStream::error_stream(),
2708
                  "DTraceMonitorProbes flag is not applicable for this configuration\n");
2709
      return JNI_EINVAL;
2710
#endif // !defined(DTRACE_ENABLED)
2711
#ifdef ASSERT
2712
    } else if (match_option(option, "-XX:+FullGCALot")) {
2713
      if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2714
        return JNI_EINVAL;
2715
      }
2716
#endif
2717
#if !INCLUDE_MANAGEMENT
2718
    } else if (match_option(option, "-XX:+ManagementServer")) {
2719
        jio_fprintf(defaultStream::error_stream(),
2720
          "ManagementServer is not supported in this VM.\n");
2721
        return JNI_ERR;
2722
#endif // INCLUDE_MANAGEMENT
2723
#if INCLUDE_JVMCI
2724
    } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2725
      if (EnableJVMCIProduct) {
2726
        jio_fprintf(defaultStream::error_stream(),
2727
                  "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2728
        return JNI_EINVAL;
2729
      }
2730
    } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2731
      bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2732
      if (use_graal_jit) {
2733
        const char* jvmci_compiler = get_property("jvmci.Compiler");
2734
        if (jvmci_compiler != nullptr) {
2735
          if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2736
            jio_fprintf(defaultStream::error_stream(),
2737
              "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2738
            return JNI_ERR;
2739
          }
2740
        } else if (!add_property("jvmci.Compiler=graal")) {
2741
            return JNI_ENOMEM;
2742
        }
2743
      }
2744

2745
      // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2746
      if (EnableJVMCIProduct) {
2747
        continue;
2748
      }
2749
      JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2750
      // Allow this flag if it has been unlocked.
2751
      if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2752
        if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2753
          jio_fprintf(defaultStream::error_stream(),
2754
            "Unable to enable JVMCI in product mode\n");
2755
          return JNI_ERR;
2756
        }
2757
      }
2758
      // The flag was locked so process normally to report that error
2759
      else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2760
        return JNI_EINVAL;
2761
      }
2762
#endif // INCLUDE_JVMCI
2763
#if INCLUDE_JFR
2764
    } else if (match_jfr_option(&option)) {
2765
      return JNI_EINVAL;
2766
#endif
2767
    } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2768
      // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2769
      // already been handled
2770
      if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2771
          (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2772
        if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2773
          return JNI_EINVAL;
2774
        }
2775
      }
2776
    // Unknown option
2777
    } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2778
      return JNI_ERR;
2779
    }
2780
  }
2781

2782
  // PrintSharedArchiveAndExit will turn on
2783
  //   -Xshare:on
2784
  //   -Xlog:class+path=info
2785
  if (PrintSharedArchiveAndExit) {
2786
    UseSharedSpaces = true;
2787
    RequireSharedSpaces = true;
2788
    LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2789
  }
2790

2791
  fix_appclasspath();
2792

2793
  return JNI_OK;
2794
}
2795

2796
void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2797
  // For java.base check for duplicate --patch-module options being specified on the command line.
2798
  // This check is only required for java.base, all other duplicate module specifications
2799
  // will be checked during module system initialization.  The module system initialization
2800
  // will throw an ExceptionInInitializerError if this situation occurs.
2801
  if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2802
    if (*patch_mod_javabase) {
2803
      vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2804
    } else {
2805
      *patch_mod_javabase = true;
2806
    }
2807
  }
2808

2809
  // Create GrowableArray lazily, only if --patch-module has been specified
2810
  if (_patch_mod_prefix == nullptr) {
2811
    _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2812
  }
2813

2814
  _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2815
}
2816

2817
// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2818
//
2819
// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2820
// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2821
// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2822
// path is treated as the current directory.
2823
//
2824
// This causes problems with CDS, which requires that all directories specified in the classpath
2825
// must be empty. In most cases, applications do NOT want to load classes from the current
2826
// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2827
// scripts compatible with CDS.
2828
void Arguments::fix_appclasspath() {
2829
  if (IgnoreEmptyClassPaths) {
2830
    const char separator = *os::path_separator();
2831
    const char* src = _java_class_path->value();
2832

2833
    // skip over all the leading empty paths
2834
    while (*src == separator) {
2835
      src ++;
2836
    }
2837

2838
    char* copy = os::strdup_check_oom(src, mtArguments);
2839

2840
    // trim all trailing empty paths
2841
    for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2842
      *tail = '\0';
2843
    }
2844

2845
    char from[3] = {separator, separator, '\0'};
2846
    char to  [2] = {separator, '\0'};
2847
    while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2848
      // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2849
      // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2850
    }
2851

2852
    _java_class_path->set_writeable_value(copy);
2853
    FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2854
  }
2855
}
2856

2857
jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2858
  // check if the default lib/endorsed directory exists; if so, error
2859
  char path[JVM_MAXPATHLEN];
2860
  const char* fileSep = os::file_separator();
2861
  jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2862

2863
  DIR* dir = os::opendir(path);
2864
  if (dir != nullptr) {
2865
    jio_fprintf(defaultStream::output_stream(),
2866
      "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2867
      "in modular form will be supported via the concept of upgradeable modules.\n");
2868
    os::closedir(dir);
2869
    return JNI_ERR;
2870
  }
2871

2872
  jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2873
  dir = os::opendir(path);
2874
  if (dir != nullptr) {
2875
    jio_fprintf(defaultStream::output_stream(),
2876
      "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2877
      "Use -classpath instead.\n.");
2878
    os::closedir(dir);
2879
    return JNI_ERR;
2880
  }
2881

2882
  // This must be done after all arguments have been processed
2883
  // and the container support has been initialized since AggressiveHeap
2884
  // relies on the amount of total memory available.
2885
  if (AggressiveHeap) {
2886
    jint result = set_aggressive_heap_flags();
2887
    if (result != JNI_OK) {
2888
      return result;
2889
    }
2890
  }
2891

2892
  // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2893
  // but like -Xint, leave compilation thresholds unaffected.
2894
  // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2895
  if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2896
    set_mode_flags(_int);
2897
  }
2898

2899
#ifdef ZERO
2900
  // Zero always runs in interpreted mode
2901
  set_mode_flags(_int);
2902
#endif
2903

2904
  // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2905
  if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2906
    FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2907
  }
2908

2909
#if !COMPILER2_OR_JVMCI
2910
  // Don't degrade server performance for footprint
2911
  if (FLAG_IS_DEFAULT(UseLargePages) &&
2912
      MaxHeapSize < LargePageHeapSizeThreshold) {
2913
    // No need for large granularity pages w/small heaps.
2914
    // Note that large pages are enabled/disabled for both the
2915
    // Java heap and the code cache.
2916
    FLAG_SET_DEFAULT(UseLargePages, false);
2917
  }
2918

2919
  UNSUPPORTED_OPTION(ProfileInterpreter);
2920
#endif
2921

2922
  // Parse the CompilationMode flag
2923
  if (!CompilationModeFlag::initialize()) {
2924
    return JNI_ERR;
2925
  }
2926

2927
  if (!check_vm_args_consistency()) {
2928
    return JNI_ERR;
2929
  }
2930

2931
  if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
2932
    return JNI_ERR;
2933
  }
2934

2935
#ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2936
  UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2937
#endif // CAN_SHOW_REGISTERS_ON_ASSERT
2938

2939
  return JNI_OK;
2940
}
2941

2942
// Helper class for controlling the lifetime of JavaVMInitArgs
2943
// objects.  The contents of the JavaVMInitArgs are guaranteed to be
2944
// deleted on the destruction of the ScopedVMInitArgs object.
2945
class ScopedVMInitArgs : public StackObj {
2946
 private:
2947
  JavaVMInitArgs _args;
2948
  char*          _container_name;
2949
  bool           _is_set;
2950
  char*          _vm_options_file_arg;
2951

2952
 public:
2953
  ScopedVMInitArgs(const char *container_name) {
2954
    _args.version = JNI_VERSION_1_2;
2955
    _args.nOptions = 0;
2956
    _args.options = nullptr;
2957
    _args.ignoreUnrecognized = false;
2958
    _container_name = (char *)container_name;
2959
    _is_set = false;
2960
    _vm_options_file_arg = nullptr;
2961
  }
2962

2963
  // Populates the JavaVMInitArgs object represented by this
2964
  // ScopedVMInitArgs object with the arguments in options.  The
2965
  // allocated memory is deleted by the destructor.  If this method
2966
  // returns anything other than JNI_OK, then this object is in a
2967
  // partially constructed state, and should be abandoned.
2968
  jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2969
    _is_set = true;
2970
    JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2971
        JavaVMOption, options->length(), mtArguments);
2972
    if (options_arr == nullptr) {
2973
      return JNI_ENOMEM;
2974
    }
2975
    _args.options = options_arr;
2976

2977
    for (int i = 0; i < options->length(); i++) {
2978
      options_arr[i] = options->at(i);
2979
      options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2980
      if (options_arr[i].optionString == nullptr) {
2981
        // Rely on the destructor to do cleanup.
2982
        _args.nOptions = i;
2983
        return JNI_ENOMEM;
2984
      }
2985
    }
2986

2987
    _args.nOptions = options->length();
2988
    _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2989
    return JNI_OK;
2990
  }
2991

2992
  JavaVMInitArgs* get()             { return &_args; }
2993
  char* container_name()            { return _container_name; }
2994
  bool  is_set()                    { return _is_set; }
2995
  bool  found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
2996
  char* vm_options_file_arg()       { return _vm_options_file_arg; }
2997

2998
  void set_vm_options_file_arg(const char *vm_options_file_arg) {
2999
    if (_vm_options_file_arg != nullptr) {
3000
      os::free(_vm_options_file_arg);
3001
    }
3002
    _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3003
  }
3004

3005
  ~ScopedVMInitArgs() {
3006
    if (_vm_options_file_arg != nullptr) {
3007
      os::free(_vm_options_file_arg);
3008
    }
3009
    if (_args.options == nullptr) return;
3010
    for (int i = 0; i < _args.nOptions; i++) {
3011
      os::free(_args.options[i].optionString);
3012
    }
3013
    FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3014
  }
3015

3016
  // Insert options into this option list, to replace option at
3017
  // vm_options_file_pos (-XX:VMOptionsFile)
3018
  jint insert(const JavaVMInitArgs* args,
3019
              const JavaVMInitArgs* args_to_insert,
3020
              const int vm_options_file_pos) {
3021
    assert(_args.options == nullptr, "shouldn't be set yet");
3022
    assert(args_to_insert->nOptions != 0, "there should be args to insert");
3023
    assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3024

3025
    int length = args->nOptions + args_to_insert->nOptions - 1;
3026
    // Construct new option array
3027
    GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3028
    for (int i = 0; i < args->nOptions; i++) {
3029
      if (i == vm_options_file_pos) {
3030
        // insert the new options starting at the same place as the
3031
        // -XX:VMOptionsFile option
3032
        for (int j = 0; j < args_to_insert->nOptions; j++) {
3033
          options.push(args_to_insert->options[j]);
3034
        }
3035
      } else {
3036
        options.push(args->options[i]);
3037
      }
3038
    }
3039
    // make into options array
3040
    return set_args(&options);
3041
  }
3042
};
3043

3044
jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3045
  return parse_options_environment_variable("_JAVA_OPTIONS", args);
3046
}
3047

3048
jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3049
  return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3050
}
3051

3052
jint Arguments::parse_options_environment_variable(const char* name,
3053
                                                   ScopedVMInitArgs* vm_args) {
3054
  char *buffer = ::getenv(name);
3055

3056
  // Don't check this environment variable if user has special privileges
3057
  // (e.g. unix su command).
3058
  if (buffer == nullptr || os::have_special_privileges()) {
3059
    return JNI_OK;
3060
  }
3061

3062
  if ((buffer = os::strdup(buffer)) == nullptr) {
3063
    return JNI_ENOMEM;
3064
  }
3065

3066
  jio_fprintf(defaultStream::error_stream(),
3067
              "Picked up %s: %s\n", name, buffer);
3068

3069
  int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3070

3071
  os::free(buffer);
3072
  return retcode;
3073
}
3074

3075
jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3076
  // read file into buffer
3077
  int fd = ::open(file_name, O_RDONLY);
3078
  if (fd < 0) {
3079
    jio_fprintf(defaultStream::error_stream(),
3080
                "Could not open options file '%s'\n",
3081
                file_name);
3082
    return JNI_ERR;
3083
  }
3084

3085
  struct stat stbuf;
3086
  int retcode = os::stat(file_name, &stbuf);
3087
  if (retcode != 0) {
3088
    jio_fprintf(defaultStream::error_stream(),
3089
                "Could not stat options file '%s'\n",
3090
                file_name);
3091
    ::close(fd);
3092
    return JNI_ERR;
3093
  }
3094

3095
  if (stbuf.st_size == 0) {
3096
    // tell caller there is no option data and that is ok
3097
    ::close(fd);
3098
    return JNI_OK;
3099
  }
3100

3101
  // '+ 1' for null termination even with max bytes
3102
  size_t bytes_alloc = stbuf.st_size + 1;
3103

3104
  char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3105
  if (nullptr == buf) {
3106
    jio_fprintf(defaultStream::error_stream(),
3107
                "Could not allocate read buffer for options file parse\n");
3108
    ::close(fd);
3109
    return JNI_ENOMEM;
3110
  }
3111

3112
  memset(buf, 0, bytes_alloc);
3113

3114
  // Fill buffer
3115
  ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3116
  ::close(fd);
3117
  if (bytes_read < 0) {
3118
    FREE_C_HEAP_ARRAY(char, buf);
3119
    jio_fprintf(defaultStream::error_stream(),
3120
                "Could not read options file '%s'\n", file_name);
3121
    return JNI_ERR;
3122
  }
3123

3124
  if (bytes_read == 0) {
3125
    // tell caller there is no option data and that is ok
3126
    FREE_C_HEAP_ARRAY(char, buf);
3127
    return JNI_OK;
3128
  }
3129

3130
  retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3131

3132
  FREE_C_HEAP_ARRAY(char, buf);
3133
  return retcode;
3134
}
3135

3136
jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3137
  // Construct option array
3138
  GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3139

3140
  // some pointers to help with parsing
3141
  char *buffer_end = buffer + buf_len;
3142
  char *opt_hd = buffer;
3143
  char *wrt = buffer;
3144
  char *rd = buffer;
3145

3146
  // parse all options
3147
  while (rd < buffer_end) {
3148
    // skip leading white space from the input string
3149
    while (rd < buffer_end && isspace((unsigned char) *rd)) {
3150
      rd++;
3151
    }
3152

3153
    if (rd >= buffer_end) {
3154
      break;
3155
    }
3156

3157
    // Remember this is where we found the head of the token.
3158
    opt_hd = wrt;
3159

3160
    // Tokens are strings of non white space characters separated
3161
    // by one or more white spaces.
3162
    while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3163
      if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3164
        int quote = *rd;                    // matching quote to look for
3165
        rd++;                               // don't copy open quote
3166
        while (rd < buffer_end && *rd != quote) {
3167
                                            // include everything (even spaces)
3168
                                            // up until the close quote
3169
          *wrt++ = *rd++;                   // copy to option string
3170
        }
3171

3172
        if (rd < buffer_end) {
3173
          rd++;                             // don't copy close quote
3174
        } else {
3175
                                            // did not see closing quote
3176
          jio_fprintf(defaultStream::error_stream(),
3177
                      "Unmatched quote in %s\n", name);
3178
          return JNI_ERR;
3179
        }
3180
      } else {
3181
        *wrt++ = *rd++;                     // copy to option string
3182
      }
3183
    }
3184

3185
    // steal a white space character and set it to null
3186
    *wrt++ = '\0';
3187
    // We now have a complete token
3188

3189
    JavaVMOption option;
3190
    option.optionString = opt_hd;
3191
    option.extraInfo = nullptr;
3192

3193
    options.append(option);                // Fill in option
3194

3195
    rd++;  // Advance to next character
3196
  }
3197

3198
  // Fill out JavaVMInitArgs structure.
3199
  return vm_args->set_args(&options);
3200
}
3201

3202
#ifndef PRODUCT
3203
// Determine whether LogVMOutput should be implicitly turned on.
3204
static bool use_vm_log() {
3205
  if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3206
      PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3207
      PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3208
      PrintAssembly || TraceDeoptimization ||
3209
      (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3210
    return true;
3211
  }
3212

3213
#ifdef COMPILER1
3214
  if (PrintC1Statistics) {
3215
    return true;
3216
  }
3217
#endif // COMPILER1
3218

3219
#ifdef COMPILER2
3220
  if (PrintOptoAssembly || PrintOptoStatistics) {
3221
    return true;
3222
  }
3223
#endif // COMPILER2
3224

3225
  return false;
3226
}
3227

3228
#endif // PRODUCT
3229

3230
bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3231
  for (int index = 0; index < args->nOptions; index++) {
3232
    const JavaVMOption* option = args->options + index;
3233
    const char* tail;
3234
    if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3235
      return true;
3236
    }
3237
  }
3238
  return false;
3239
}
3240

3241
jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3242
                                       const char* vm_options_file,
3243
                                       const int vm_options_file_pos,
3244
                                       ScopedVMInitArgs* vm_options_file_args,
3245
                                       ScopedVMInitArgs* args_out) {
3246
  jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3247
  if (code != JNI_OK) {
3248
    return code;
3249
  }
3250

3251
  if (vm_options_file_args->get()->nOptions < 1) {
3252
    return JNI_OK;
3253
  }
3254

3255
  if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3256
    jio_fprintf(defaultStream::error_stream(),
3257
                "A VM options file may not refer to a VM options file. "
3258
                "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3259
                "options file '%s' in options container '%s' is an error.\n",
3260
                vm_options_file_args->vm_options_file_arg(),
3261
                vm_options_file_args->container_name());
3262
    return JNI_EINVAL;
3263
  }
3264

3265
  return args_out->insert(args, vm_options_file_args->get(),
3266
                          vm_options_file_pos);
3267
}
3268

3269
// Expand -XX:VMOptionsFile found in args_in as needed.
3270
// mod_args and args_out parameters may return values as needed.
3271
jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3272
                                            ScopedVMInitArgs* mod_args,
3273
                                            JavaVMInitArgs** args_out) {
3274
  jint code = match_special_option_and_act(args_in, mod_args);
3275
  if (code != JNI_OK) {
3276
    return code;
3277
  }
3278

3279
  if (mod_args->is_set()) {
3280
    // args_in contains -XX:VMOptionsFile and mod_args contains the
3281
    // original options from args_in along with the options expanded
3282
    // from the VMOptionsFile. Return a short-hand to the caller.
3283
    *args_out = mod_args->get();
3284
  } else {
3285
    *args_out = (JavaVMInitArgs *)args_in;  // no changes so use args_in
3286
  }
3287
  return JNI_OK;
3288
}
3289

3290
jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3291
                                             ScopedVMInitArgs* args_out) {
3292
  // Remaining part of option string
3293
  const char* tail;
3294
  ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3295

3296
  for (int index = 0; index < args->nOptions; index++) {
3297
    const JavaVMOption* option = args->options + index;
3298
    if (match_option(option, "-XX:Flags=", &tail)) {
3299
      Arguments::set_jvm_flags_file(tail);
3300
      continue;
3301
    }
3302
    if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3303
      if (vm_options_file_args.found_vm_options_file_arg()) {
3304
        jio_fprintf(defaultStream::error_stream(),
3305
                    "The option '%s' is already specified in the options "
3306
                    "container '%s' so the specification of '%s' in the "
3307
                    "same options container is an error.\n",
3308
                    vm_options_file_args.vm_options_file_arg(),
3309
                    vm_options_file_args.container_name(),
3310
                    option->optionString);
3311
        return JNI_EINVAL;
3312
      }
3313
      vm_options_file_args.set_vm_options_file_arg(option->optionString);
3314
      // If there's a VMOptionsFile, parse that
3315
      jint code = insert_vm_options_file(args, tail, index,
3316
                                         &vm_options_file_args, args_out);
3317
      if (code != JNI_OK) {
3318
        return code;
3319
      }
3320
      args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3321
      if (args_out->is_set()) {
3322
        // The VMOptions file inserted some options so switch 'args'
3323
        // to the new set of options, and continue processing which
3324
        // preserves "last option wins" semantics.
3325
        args = args_out->get();
3326
        // The first option from the VMOptionsFile replaces the
3327
        // current option.  So we back track to process the
3328
        // replacement option.
3329
        index--;
3330
      }
3331
      continue;
3332
    }
3333
    if (match_option(option, "-XX:+PrintVMOptions")) {
3334
      PrintVMOptions = true;
3335
      continue;
3336
    }
3337
    if (match_option(option, "-XX:-PrintVMOptions")) {
3338
      PrintVMOptions = false;
3339
      continue;
3340
    }
3341
    if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3342
      IgnoreUnrecognizedVMOptions = true;
3343
      continue;
3344
    }
3345
    if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3346
      IgnoreUnrecognizedVMOptions = false;
3347
      continue;
3348
    }
3349
    if (match_option(option, "-XX:+PrintFlagsInitial")) {
3350
      JVMFlag::printFlags(tty, false);
3351
      vm_exit(0);
3352
    }
3353

3354
#ifndef PRODUCT
3355
    if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3356
      JVMFlag::printFlags(tty, true);
3357
      vm_exit(0);
3358
    }
3359
#endif
3360
  }
3361
  return JNI_OK;
3362
}
3363

3364
static void print_options(const JavaVMInitArgs *args) {
3365
  const char* tail;
3366
  for (int index = 0; index < args->nOptions; index++) {
3367
    const JavaVMOption *option = args->options + index;
3368
    if (match_option(option, "-XX:", &tail)) {
3369
      logOption(tail);
3370
    }
3371
  }
3372
}
3373

3374
bool Arguments::handle_deprecated_print_gc_flags() {
3375
  if (PrintGC) {
3376
    log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3377
  }
3378
  if (PrintGCDetails) {
3379
    log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3380
  }
3381

3382
  if (_legacyGCLogging.lastFlag == 2) {
3383
    // -Xloggc was used to specify a filename
3384
    const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3385

3386
    LogTarget(Error, logging) target;
3387
    LogStream errstream(target);
3388
    return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3389
  } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3390
    LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3391
  }
3392
  return true;
3393
}
3394

3395
static void apply_debugger_ergo() {
3396
#ifdef ASSERT
3397
  if (ReplayCompiles) {
3398
    FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3399
  }
3400

3401
  if (UseDebuggerErgo) {
3402
    // Turn on sub-flags
3403
    FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3404
    FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3405
  }
3406

3407
  if (UseDebuggerErgo2) {
3408
    // Debugging with limited number of CPUs
3409
    FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3410
    FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3411
    FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3412
    FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3413
  }
3414
#endif // ASSERT
3415
}
3416

3417
// Parse entry point called from JNI_CreateJavaVM
3418

3419
jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3420
  assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3421
  JVMFlag::check_all_flag_declarations();
3422

3423
  // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3424
  const char* hotspotrc = ".hotspotrc";
3425
  bool settings_file_specified = false;
3426
  bool needs_hotspotrc_warning = false;
3427
  ScopedVMInitArgs initial_vm_options_args("");
3428
  ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3429
  ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3430

3431
  // Pointers to current working set of containers
3432
  JavaVMInitArgs* cur_cmd_args;
3433
  JavaVMInitArgs* cur_vm_options_args;
3434
  JavaVMInitArgs* cur_java_options_args;
3435
  JavaVMInitArgs* cur_java_tool_options_args;
3436

3437
  // Containers for modified/expanded options
3438
  ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3439
  ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3440
  ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3441
  ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3442

3443

3444
  jint code =
3445
      parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3446
  if (code != JNI_OK) {
3447
    return code;
3448
  }
3449

3450
  code = parse_java_options_environment_variable(&initial_java_options_args);
3451
  if (code != JNI_OK) {
3452
    return code;
3453
  }
3454

3455
  // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3456
  char *vmoptions = ClassLoader::lookup_vm_options();
3457
  if (vmoptions != nullptr) {
3458
    code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3459
    FREE_C_HEAP_ARRAY(char, vmoptions);
3460
    if (code != JNI_OK) {
3461
      return code;
3462
    }
3463
  }
3464

3465
  code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3466
                                     &mod_java_tool_options_args,
3467
                                     &cur_java_tool_options_args);
3468
  if (code != JNI_OK) {
3469
    return code;
3470
  }
3471

3472
  code = expand_vm_options_as_needed(initial_cmd_args,
3473
                                     &mod_cmd_args,
3474
                                     &cur_cmd_args);
3475
  if (code != JNI_OK) {
3476
    return code;
3477
  }
3478

3479
  code = expand_vm_options_as_needed(initial_java_options_args.get(),
3480
                                     &mod_java_options_args,
3481
                                     &cur_java_options_args);
3482
  if (code != JNI_OK) {
3483
    return code;
3484
  }
3485

3486
  code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3487
                                     &mod_vm_options_args,
3488
                                     &cur_vm_options_args);
3489
  if (code != JNI_OK) {
3490
    return code;
3491
  }
3492

3493
  const char* flags_file = Arguments::get_jvm_flags_file();
3494
  settings_file_specified = (flags_file != nullptr);
3495

3496
  if (IgnoreUnrecognizedVMOptions) {
3497
    cur_cmd_args->ignoreUnrecognized = true;
3498
    cur_java_tool_options_args->ignoreUnrecognized = true;
3499
    cur_java_options_args->ignoreUnrecognized = true;
3500
  }
3501

3502
  // Parse specified settings file
3503
  if (settings_file_specified) {
3504
    if (!process_settings_file(flags_file, true,
3505
                               cur_cmd_args->ignoreUnrecognized)) {
3506
      return JNI_EINVAL;
3507
    }
3508
  } else {
3509
#ifdef ASSERT
3510
    // Parse default .hotspotrc settings file
3511
    if (!process_settings_file(".hotspotrc", false,
3512
                               cur_cmd_args->ignoreUnrecognized)) {
3513
      return JNI_EINVAL;
3514
    }
3515
#else
3516
    struct stat buf;
3517
    if (os::stat(hotspotrc, &buf) == 0) {
3518
      needs_hotspotrc_warning = true;
3519
    }
3520
#endif
3521
  }
3522

3523
  if (PrintVMOptions) {
3524
    print_options(cur_java_tool_options_args);
3525
    print_options(cur_cmd_args);
3526
    print_options(cur_java_options_args);
3527
  }
3528

3529
  // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3530
  jint result = parse_vm_init_args(cur_vm_options_args,
3531
                                   cur_java_tool_options_args,
3532
                                   cur_java_options_args,
3533
                                   cur_cmd_args);
3534

3535
  if (result != JNI_OK) {
3536
    return result;
3537
  }
3538

3539
  // Delay warning until here so that we've had a chance to process
3540
  // the -XX:-PrintWarnings flag
3541
  if (needs_hotspotrc_warning) {
3542
    warning("%s file is present but has been ignored.  "
3543
            "Run with -XX:Flags=%s to load the file.",
3544
            hotspotrc, hotspotrc);
3545
  }
3546

3547
  if (needs_module_property_warning) {
3548
    warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3549
            " names that are reserved for internal use.");
3550
  }
3551

3552
#if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
3553
  UNSUPPORTED_OPTION(UseLargePages);
3554
#endif
3555

3556
#if defined(AIX)
3557
  UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3558
#endif
3559

3560
#ifndef PRODUCT
3561
  if (TraceBytecodesAt != 0) {
3562
    TraceBytecodes = true;
3563
  }
3564
#endif // PRODUCT
3565

3566
  if (ScavengeRootsInCode == 0) {
3567
    if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3568
      warning("Forcing ScavengeRootsInCode non-zero");
3569
    }
3570
    ScavengeRootsInCode = 1;
3571
  }
3572

3573
  if (!handle_deprecated_print_gc_flags()) {
3574
    return JNI_EINVAL;
3575
  }
3576

3577
  // Set object alignment values.
3578
  set_object_alignment();
3579

3580
#if !INCLUDE_CDS
3581
  if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3582
    jio_fprintf(defaultStream::error_stream(),
3583
      "Shared spaces are not supported in this VM\n");
3584
    return JNI_ERR;
3585
  }
3586
  if (DumpLoadedClassList != nullptr) {
3587
    jio_fprintf(defaultStream::error_stream(),
3588
      "DumpLoadedClassList is not supported in this VM\n");
3589
    return JNI_ERR;
3590
  }
3591
  if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3592
      log_is_enabled(Info, cds)) {
3593
    warning("Shared spaces are not supported in this VM");
3594
    UseSharedSpaces = false;
3595
    LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3596
  }
3597
  no_shared_spaces("CDS Disabled");
3598
#endif // INCLUDE_CDS
3599

3600
  // Verify NMT arguments
3601
  const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3602
  if (lvl == NMT_unknown) {
3603
    jio_fprintf(defaultStream::error_stream(),
3604
                "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3605
    return JNI_ERR;
3606
  }
3607
  if (PrintNMTStatistics && lvl == NMT_off) {
3608
    warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3609
    FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3610
  }
3611

3612
  bool trace_dependencies = log_is_enabled(Debug, dependencies);
3613
  if (trace_dependencies && VerifyDependencies) {
3614
    warning("dependency logging results may be inflated by VerifyDependencies");
3615
  }
3616

3617
  bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3618
                              log_is_enabled(Info, class, load, cause);
3619
  if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3620
    warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3621
  }
3622

3623
  apply_debugger_ergo();
3624

3625
  // The VMThread needs to stop now and then to execute these debug options.
3626
  if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3627
    FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3628
  }
3629

3630
  if (log_is_enabled(Info, arguments)) {
3631
    LogStream st(Log(arguments)::info());
3632
    Arguments::print_on(&st);
3633
  }
3634

3635
  return JNI_OK;
3636
}
3637

3638
jint Arguments::apply_ergo() {
3639
  // Set flags based on ergonomics.
3640
  jint result = set_ergonomics_flags();
3641
  if (result != JNI_OK) return result;
3642

3643
  // Set heap size based on available physical memory
3644
  set_heap_size();
3645

3646
  GCConfig::arguments()->initialize();
3647

3648
  CDSConfig::initialize();
3649

3650
  // Initialize Metaspace flags and alignments
3651
  Metaspace::ergo_initialize();
3652

3653
  if (!StringDedup::ergo_initialize()) {
3654
    return JNI_EINVAL;
3655
  }
3656

3657
  // Set compiler flags after GC is selected and GC specific
3658
  // flags (LoopStripMiningIter) are set.
3659
  CompilerConfig::ergo_initialize();
3660

3661
  // Set bytecode rewriting flags
3662
  set_bytecode_flags();
3663

3664
  // Set flags if aggressive optimization flags are enabled
3665
  jint code = set_aggressive_opts_flags();
3666
  if (code != JNI_OK) {
3667
    return code;
3668
  }
3669

3670
  if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3671
    FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3672
  } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3673
    warning("UseSecondarySupersTable is not supported");
3674
    FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3675
  }
3676
  if (!UseSecondarySupersTable) {
3677
    FLAG_SET_DEFAULT(StressSecondarySupers, false);
3678
    FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3679
  }
3680

3681
#ifdef ZERO
3682
  // Clear flags not supported on zero.
3683
  FLAG_SET_DEFAULT(ProfileInterpreter, false);
3684
#endif // ZERO
3685

3686
  if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3687
    warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3688
    DebugNonSafepoints = true;
3689
  }
3690

3691
  if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3692
    warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3693
  }
3694

3695
  // Treat the odd case where local verification is enabled but remote
3696
  // verification is not as if both were enabled.
3697
  if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3698
    log_info(verification)("Turning on remote verification because local verification is on");
3699
    FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3700
  }
3701

3702
#ifndef PRODUCT
3703
  if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3704
    if (use_vm_log()) {
3705
      LogVMOutput = true;
3706
    }
3707
  }
3708
#endif // PRODUCT
3709

3710
  if (PrintCommandLineFlags) {
3711
    JVMFlag::printSetFlags(tty);
3712
  }
3713

3714
#if COMPILER2_OR_JVMCI
3715
  if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3716
    if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3717
      warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3718
    }
3719
    FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3720

3721
    if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3722
      if (!EnableVectorReboxing) {
3723
        warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3724
      } else {
3725
        warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3726
      }
3727
    }
3728
    FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3729

3730
    if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3731
      warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3732
    }
3733
    FLAG_SET_DEFAULT(UseVectorStubs, false);
3734
  }
3735
#endif // COMPILER2_OR_JVMCI
3736

3737
  if (log_is_enabled(Info, perf, class, link)) {
3738
    if (!UsePerfData) {
3739
      warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3740
      LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3741
    }
3742
  }
3743

3744
  if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3745
    if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3746
      LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3747
    }
3748
  }
3749
  return JNI_OK;
3750
}
3751

3752
jint Arguments::adjust_after_os() {
3753
  if (UseNUMA) {
3754
    if (UseParallelGC) {
3755
      if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3756
         FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3757
      }
3758
    }
3759
  }
3760
  return JNI_OK;
3761
}
3762

3763
int Arguments::PropertyList_count(SystemProperty* pl) {
3764
  int count = 0;
3765
  while(pl != nullptr) {
3766
    count++;
3767
    pl = pl->next();
3768
  }
3769
  return count;
3770
}
3771

3772
// Return the number of readable properties.
3773
int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3774
  int count = 0;
3775
  while(pl != nullptr) {
3776
    if (pl->readable()) {
3777
      count++;
3778
    }
3779
    pl = pl->next();
3780
  }
3781
  return count;
3782
}
3783

3784
const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3785
  assert(key != nullptr, "just checking");
3786
  SystemProperty* prop;
3787
  for (prop = pl; prop != nullptr; prop = prop->next()) {
3788
    if (strcmp(key, prop->key()) == 0) return prop->value();
3789
  }
3790
  return nullptr;
3791
}
3792

3793
// Return the value of the requested property provided that it is a readable property.
3794
const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3795
  assert(key != nullptr, "just checking");
3796
  SystemProperty* prop;
3797
  // Return the property value if the keys match and the property is not internal or
3798
  // it's the special internal property "jdk.boot.class.path.append".
3799
  for (prop = pl; prop != nullptr; prop = prop->next()) {
3800
    if (strcmp(key, prop->key()) == 0) {
3801
      if (!prop->internal()) {
3802
        return prop->value();
3803
      } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3804
        return prop->value();
3805
      } else {
3806
        // Property is internal and not jdk.boot.class.path.append so return null.
3807
        return nullptr;
3808
      }
3809
    }
3810
  }
3811
  return nullptr;
3812
}
3813

3814
void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3815
  SystemProperty* p = *plist;
3816
  if (p == nullptr) {
3817
    *plist = new_p;
3818
  } else {
3819
    while (p->next() != nullptr) {
3820
      p = p->next();
3821
    }
3822
    p->set_next(new_p);
3823
  }
3824
}
3825

3826
void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3827
                                 bool writeable, bool internal) {
3828
  if (plist == nullptr)
3829
    return;
3830

3831
  SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3832
  PropertyList_add(plist, new_p);
3833
}
3834

3835
void Arguments::PropertyList_add(SystemProperty *element) {
3836
  PropertyList_add(&_system_properties, element);
3837
}
3838

3839
// This add maintains unique property key in the list.
3840
void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3841
                                        PropertyAppendable append, PropertyWriteable writeable,
3842
                                        PropertyInternal internal) {
3843
  if (plist == nullptr)
3844
    return;
3845

3846
  // If property key exists and is writeable, then update with new value.
3847
  // Trying to update a non-writeable property is silently ignored.
3848
  SystemProperty* prop;
3849
  for (prop = *plist; prop != nullptr; prop = prop->next()) {
3850
    if (strcmp(k, prop->key()) == 0) {
3851
      if (append == AppendProperty) {
3852
        prop->append_writeable_value(v);
3853
      } else {
3854
        prop->set_writeable_value(v);
3855
      }
3856
      return;
3857
    }
3858
  }
3859

3860
  PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3861
}
3862

3863
// Copies src into buf, replacing "%%" with "%" and "%p" with pid
3864
// Returns true if all of the source pointed by src has been copied over to
3865
// the destination buffer pointed by buf. Otherwise, returns false.
3866
// Notes:
3867
// 1. If the length (buflen) of the destination buffer excluding the
3868
// null terminator character is not long enough for holding the expanded
3869
// pid characters, it also returns false instead of returning the partially
3870
// expanded one.
3871
// 2. The passed in "buflen" should be large enough to hold the null terminator.
3872
bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3873
                                char* buf, size_t buflen) {
3874
  const char* p = src;
3875
  char* b = buf;
3876
  const char* src_end = &src[srclen];
3877
  char* buf_end = &buf[buflen - 1];
3878

3879
  while (p < src_end && b < buf_end) {
3880
    if (*p == '%') {
3881
      switch (*(++p)) {
3882
      case '%':         // "%%" ==> "%"
3883
        *b++ = *p++;
3884
        break;
3885
      case 'p':  {       //  "%p" ==> current process id
3886
        // buf_end points to the character before the last character so
3887
        // that we could write '\0' to the end of the buffer.
3888
        size_t buf_sz = buf_end - b + 1;
3889
        int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3890

3891
        // if jio_snprintf fails or the buffer is not long enough to hold
3892
        // the expanded pid, returns false.
3893
        if (ret < 0 || ret >= (int)buf_sz) {
3894
          return false;
3895
        } else {
3896
          b += ret;
3897
          assert(*b == '\0', "fail in copy_expand_pid");
3898
          if (p == src_end && b == buf_end + 1) {
3899
            // reach the end of the buffer.
3900
            return true;
3901
          }
3902
        }
3903
        p++;
3904
        break;
3905
      }
3906
      default :
3907
        *b++ = '%';
3908
      }
3909
    } else {
3910
      *b++ = *p++;
3911
    }
3912
  }
3913
  *b = '\0';
3914
  return (p == src_end); // return false if not all of the source was copied
3915
}
3916

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