/*
* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/javaAssertions.hpp"
#include "classfile/stringTable.hpp"
#include "classfile/symbolTable.hpp"
#include "code/codeCacheExtensions.hpp"
#include "gc/shared/cardTableRS.hpp"
#include "gc/shared/genCollectedHeap.hpp"
#include "gc/shared/referenceProcessor.hpp"
#include "gc/shared/taskqueue.hpp"
#include "logging/logConfiguration.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/universe.inline.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "runtime/arguments.hpp"
#include "runtime/arguments_ext.hpp"
#include "runtime/commandLineFlagConstraintList.hpp"
#include "runtime/commandLineFlagRangeList.hpp"
#include "runtime/globals.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/java.hpp"
#include "runtime/os.hpp"
#include "runtime/vm_version.hpp"
#include "services/management.hpp"
#include "services/memTracker.hpp"
#include "utilities/defaultStream.hpp"
#include "utilities/macros.hpp"
#include "utilities/stringUtils.hpp"
#if INCLUDE_JVMCI
#include "jvmci/jvmciRuntime.hpp"
#endif
#if INCLUDE_ALL_GCS
#include "gc/cms/compactibleFreeListSpace.hpp"
#include "gc/g1/g1CollectedHeap.inline.hpp"
#include "gc/parallel/parallelScavengeHeap.hpp"
#endif // INCLUDE_ALL_GCS
// Note: This is a special bug reporting site for the JVM
#define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
#define DEFAULT_JAVA_LAUNCHER "generic"
#define UNSUPPORTED_GC_OPTION(gc) \
do { \
if (gc) { \
if (FLAG_IS_CMDLINE(gc)) { \
warning(#gc " is not supported in this VM. Using Serial GC."); \
} \
FLAG_SET_DEFAULT(gc, false); \
} \
} while(0)
char** Arguments::_jvm_flags_array = NULL;
int Arguments::_num_jvm_flags = 0;
char** Arguments::_jvm_args_array = NULL;
int Arguments::_num_jvm_args = 0;
char* Arguments::_java_command = NULL;
SystemProperty* Arguments::_system_properties = NULL;
const char* Arguments::_gc_log_filename = NULL;
bool Arguments::_has_profile = false;
size_t Arguments::_conservative_max_heap_alignment = 0;
size_t Arguments::_min_heap_size = 0;
Arguments::Mode Arguments::_mode = _mixed;
bool Arguments::_java_compiler = false;
bool Arguments::_xdebug_mode = false;
const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
int Arguments::_sun_java_launcher_pid = -1;
bool Arguments::_sun_java_launcher_is_altjvm = false;
// These parameters are reset in method parse_vm_init_args()
bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
bool Arguments::_BackgroundCompilation = BackgroundCompilation;
bool Arguments::_ClipInlining = ClipInlining;
intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
char* Arguments::SharedArchivePath = NULL;
AgentLibraryList Arguments::_libraryList;
AgentLibraryList Arguments::_agentList;
abort_hook_t Arguments::_abort_hook = NULL;
exit_hook_t Arguments::_exit_hook = NULL;
vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
SystemProperty *Arguments::_sun_boot_library_path = NULL;
SystemProperty *Arguments::_java_library_path = NULL;
SystemProperty *Arguments::_java_home = NULL;
SystemProperty *Arguments::_java_class_path = NULL;
SystemProperty *Arguments::_sun_boot_class_path = NULL;
char* Arguments::_ext_dirs = NULL;
// Check if head of 'option' matches 'name', and sets 'tail' to the remaining
// part of the option string.
static bool match_option(const JavaVMOption *option, const char* name,
const char** tail) {
size_t len = strlen(name);
if (strncmp(option->optionString, name, len) == 0) {
*tail = option->optionString + len;
return true;
} else {
return false;
}
}
// Check if 'option' matches 'name'. No "tail" is allowed.
static bool match_option(const JavaVMOption *option, const char* name) {
const char* tail = NULL;
bool result = match_option(option, name, &tail);
if (tail != NULL && *tail == '\0') {
return result;
} else {
return false;
}
}
// Return true if any of the strings in null-terminated array 'names' matches.
// If tail_allowed is true, then the tail must begin with a colon; otherwise,
// the option must match exactly.
static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
bool tail_allowed) {
for (/* empty */; *names != NULL; ++names) {
if (match_option(option, *names, tail)) {
if (**tail == '\0' || tail_allowed && **tail == ':') {
return true;
}
}
}
return false;
}
static void logOption(const char* opt) {
if (PrintVMOptions) {
jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
}
}
// Process java launcher properties.
void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
// See if sun.java.launcher, sun.java.launcher.is_altjvm or
// sun.java.launcher.pid is defined.
// Must do this before setting up other system properties,
// as some of them may depend on launcher type.
for (int index = 0; index < args->nOptions; index++) {
const JavaVMOption* option = args->options + index;
const char* tail;
if (match_option(option, "-Dsun.java.launcher=", &tail)) {
process_java_launcher_argument(tail, option->extraInfo);
continue;
}
if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
if (strcmp(tail, "true") == 0) {
_sun_java_launcher_is_altjvm = true;
}
continue;
}
if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
_sun_java_launcher_pid = atoi(tail);
continue;
}
}
}
// Initialize system properties key and value.
void Arguments::init_system_properties() {
PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
"Java Virtual Machine Specification", false));
PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
// Following are JVMTI agent writable properties.
// Properties values are set to NULL and they are
// os specific they are initialized in os::init_system_properties_values().
_sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
_java_library_path = new SystemProperty("java.library.path", NULL, true);
_java_home = new SystemProperty("java.home", NULL, true);
_sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
_java_class_path = new SystemProperty("java.class.path", "", true);
// Add to System Property list.
PropertyList_add(&_system_properties, _sun_boot_library_path);
PropertyList_add(&_system_properties, _java_library_path);
PropertyList_add(&_system_properties, _java_home);
PropertyList_add(&_system_properties, _java_class_path);
PropertyList_add(&_system_properties, _sun_boot_class_path);
// Set OS specific system properties values
os::init_system_properties_values();
JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
}
// Update/Initialize System properties after JDK version number is known
void Arguments::init_version_specific_system_properties() {
enum { bufsz = 16 };
char buffer[bufsz];
const char* spec_vendor = "Oracle Corporation";
uint32_t spec_version = JDK_Version::current().major_version();
jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
PropertyList_add(&_system_properties,
new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
PropertyList_add(&_system_properties,
new SystemProperty("java.vm.specification.version", buffer, false));
PropertyList_add(&_system_properties,
new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
}
/*
* -XX argument processing:
*
* -XX arguments are defined in several places, such as:
* globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
* -XX arguments are parsed in parse_argument().
* -XX argument bounds checking is done in check_vm_args_consistency().
*
* Over time -XX arguments may change. There are mechanisms to handle common cases:
*
* ALIASED: An option that is simply another name for another option. This is often
* part of the process of deprecating a flag, but not all aliases need
* to be deprecated.
*
* Create an alias for an option by adding the old and new option names to the
* "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
*
* DEPRECATED: An option that is supported, but a warning is printed to let the user know that
* support may be removed in the future. Both regular and aliased options may be
* deprecated.
*
* Add a deprecation warning for an option (or alias) by adding an entry in the
* "special_jvm_flags" table and setting the "deprecated_in" field.
* Often an option "deprecated" in one major release will
* be made "obsolete" in the next. In this case the entry should also have it's
* "obsolete_in" field set.
*
* OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
* on the command line. A warning is printed to let the user know that option might not
* be accepted in the future.
*
* Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
* table and setting the "obsolete_in" field.
*
* EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
* to the current JDK version. The system will flatly refuse to admit the existence of
* the flag. This allows a flag to die automatically over JDK releases.
*
* Note that manual cleanup of expired options should be done at major JDK version upgrades:
* - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
* - Newly obsolete or expired deprecated options should have their global variable
* definitions removed (from globals.hpp, etc) and related implementations removed.
*
* Recommended approach for removing options:
*
* To remove options commonly used by customers (e.g. product, commercial -XX options), use
* the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
*
* To remove internal options (e.g. diagnostic, experimental, develop options), use
* a 2-step model adding major release numbers to the obsolete and expire columns.
*
* To change the name of an option, use the alias table as well as a 2-step
* model adding major release numbers to the deprecate and expire columns.
* Think twice about aliasing commonly used customer options.
*
* There are times when it is appropriate to leave a future release number as undefined.
*
* Tests: Aliases should be tested in VMAliasOptions.java.
* Deprecated options should be tested in VMDeprecatedOptions.java.
*/
// Obsolete or deprecated -XX flag.
typedef struct {
const char* name;
JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
JDK_Version expired_in; // When the option expires (or "undefined").
} SpecialFlag;
// The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
// "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
// When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
// the command-line as usual, but will issue a warning.
// When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
// the command-line, while issuing a warning and ignoring the flag value.
// Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
// existence of the flag.
//
// MANUAL CLEANUP ON JDK VERSION UPDATES:
// This table ensures that the handling of options will update automatically when the JDK
// version is incremented, but the source code needs to be cleanup up manually:
// - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
// variable should be removed, as well as users of the variable.
// - As "deprecated" options age into "obsolete" options, move the entry into the
// "Obsolete Flags" section of the table.
// - All expired options should be removed from the table.
static SpecialFlag const special_jvm_flags[] = {
// -------------- Deprecated Flags --------------
// --- Non-alias flags - sorted by obsolete_in then expired_in:
{ "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
{ "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
// --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
{ "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
{ "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
{ "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
{ "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
{ "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
{ "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
{ "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
// -------------- Obsolete Flags - sorted by expired_in --------------
{ "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
#ifndef ZERO
{ "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
#endif // ZERO
{ "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
{ "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
#ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
{ "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
{ "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
{ "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
{ "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
{ "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
{ "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
{ "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
#endif
{ NULL, JDK_Version(0), JDK_Version(0) }
};
// Flags that are aliases for other flags.
typedef struct {
const char* alias_name;
const char* real_name;
} AliasedFlag;
static AliasedFlag const aliased_jvm_flags[] = {
{ "DefaultMaxRAMFraction", "MaxRAMFraction" },
{ "CMSMarkStackSizeMax", "MarkStackSizeMax" },
{ "CMSMarkStackSize", "MarkStackSize" },
{ "G1MarkStackSize", "MarkStackSize" },
{ "ParallelMarkingThreads", "ConcGCThreads" },
{ "ParallelCMSThreads", "ConcGCThreads" },
{ "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
{ NULL, NULL}
};
// Return true if "v" is less than "other", where "other" may be "undefined".
static bool version_less_than(JDK_Version v, JDK_Version other) {
assert(!v.is_undefined(), "must be defined");
if (!other.is_undefined() && v.compare(other) >= 0) {
return false;
} else {
return true;
}
}
static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
flag = special_jvm_flags[i];
return true;
}
}
return false;
}
bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
assert(version != NULL, "Must provide a version buffer");
SpecialFlag flag;
if (lookup_special_flag(flag_name, flag)) {
if (!flag.obsolete_in.is_undefined()) {
if (version_less_than(JDK_Version::current(), flag.expired_in)) {
*version = flag.obsolete_in;
return true;
}
}
}
return false;
}
int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
assert(version != NULL, "Must provide a version buffer");
SpecialFlag flag;
if (lookup_special_flag(flag_name, flag)) {
if (!flag.deprecated_in.is_undefined()) {
if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
version_less_than(JDK_Version::current(), flag.expired_in)) {
*version = flag.deprecated_in;
return 1;
} else {
return -1;
}
}
}
return 0;
}
const char* Arguments::real_flag_name(const char *flag_name) {
for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
const AliasedFlag& flag_status = aliased_jvm_flags[i];
if (strcmp(flag_status.alias_name, flag_name) == 0) {
return flag_status.real_name;
}
}
return flag_name;
}
#ifndef PRODUCT
static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
return true;
}
}
return false;
}
static bool verify_special_jvm_flags() {
bool success = true;
for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
const SpecialFlag& flag = special_jvm_flags[i];
if (lookup_special_flag(flag.name, i)) {
warning("Duplicate special flag declaration \"%s\"", flag.name);
success = false;
}
if (flag.deprecated_in.is_undefined() &&
flag.obsolete_in.is_undefined()) {
warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
success = false;
}
if (!flag.deprecated_in.is_undefined()) {
if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
success = false;
}
if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
success = false;
}
}
if (!flag.obsolete_in.is_undefined()) {
if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
success = false;
}
// if flag has become obsolete it should not have a "globals" flag defined anymore.
if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
if (Flag::find_flag(flag.name) != NULL) {
warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
success = false;
}
}
}
if (!flag.expired_in.is_undefined()) {
// if flag has become expired it should not have a "globals" flag defined anymore.
if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
if (Flag::find_flag(flag.name) != NULL) {
warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
success = false;
}
}
}
}
return success;
}
#endif
// Constructs the system class path (aka boot class path) from the following
// components, in order:
//
// prefix // from -Xbootclasspath/p:...
// base // from os::get_system_properties() or -Xbootclasspath=
// suffix // from -Xbootclasspath/a:...
//
// This could be AllStatic, but it isn't needed after argument processing is
// complete.
class SysClassPath: public StackObj {
public:
SysClassPath(const char* base);
~SysClassPath();
inline void set_base(const char* base);
inline void add_prefix(const char* prefix);
inline void add_suffix_to_prefix(const char* suffix);
inline void add_suffix(const char* suffix);
inline void reset_path(const char* base);
inline const char* get_base() const { return _items[_scp_base]; }
inline const char* get_prefix() const { return _items[_scp_prefix]; }
inline const char* get_suffix() const { return _items[_scp_suffix]; }
// Combine all the components into a single c-heap-allocated string; caller
// must free the string if/when no longer needed.
char* combined_path();
private:
// Utility routines.
static char* add_to_path(const char* path, const char* str, bool prepend);
static char* add_jars_to_path(char* path, const char* directory);
inline void reset_item_at(int index);
// Array indices for the items that make up the sysclasspath. All except the
// base are allocated in the C heap and freed by this class.
enum {
_scp_prefix, // from -Xbootclasspath/p:...
_scp_base, // the default sysclasspath
_scp_suffix, // from -Xbootclasspath/a:...
_scp_nitems // the number of items, must be last.
};
const char* _items[_scp_nitems];
};
SysClassPath::SysClassPath(const char* base) {
memset(_items, 0, sizeof(_items));
_items[_scp_base] = base;
}
SysClassPath::~SysClassPath() {
// Free everything except the base.
for (int i = 0; i < _scp_nitems; ++i) {
if (i != _scp_base) reset_item_at(i);
}
}
inline void SysClassPath::set_base(const char* base) {
_items[_scp_base] = base;
}
inline void SysClassPath::add_prefix(const char* prefix) {
_items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
}
inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
_items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
}
inline void SysClassPath::add_suffix(const char* suffix) {
_items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
}
inline void SysClassPath::reset_item_at(int index) {
assert(index < _scp_nitems && index != _scp_base, "just checking");
if (_items[index] != NULL) {
FREE_C_HEAP_ARRAY(char, _items[index]);
_items[index] = NULL;
}
}
inline void SysClassPath::reset_path(const char* base) {
// Clear the prefix and suffix.
reset_item_at(_scp_prefix);
reset_item_at(_scp_suffix);
set_base(base);
}
//------------------------------------------------------------------------------
// Combine the bootclasspath elements, some of which may be null, into a single
// c-heap-allocated string.
char* SysClassPath::combined_path() {
assert(_items[_scp_base] != NULL, "empty default sysclasspath");
size_t lengths[_scp_nitems];
size_t total_len = 0;
const char separator = *os::path_separator();
// Get the lengths.
int i;
for (i = 0; i < _scp_nitems; ++i) {
if (_items[i] != NULL) {
lengths[i] = strlen(_items[i]);
// Include space for the separator char (or a NULL for the last item).
total_len += lengths[i] + 1;
}
}
assert(total_len > 0, "empty sysclasspath not allowed");
// Copy the _items to a single string.
char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
char* cp_tmp = cp;
for (i = 0; i < _scp_nitems; ++i) {
if (_items[i] != NULL) {
memcpy(cp_tmp, _items[i], lengths[i]);
cp_tmp += lengths[i];
*cp_tmp++ = separator;
}
}
*--cp_tmp = '\0'; // Replace the extra separator.
return cp;
}
// Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
char*
SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
char *cp;
assert(str != NULL, "just checking");
if (path == NULL) {
size_t len = strlen(str) + 1;
cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
memcpy(cp, str, len); // copy the trailing null
} else {
const char separator = *os::path_separator();
size_t old_len = strlen(path);
size_t str_len = strlen(str);
size_t len = old_len + str_len + 2;
if (prepend) {
cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
char* cp_tmp = cp;
memcpy(cp_tmp, str, str_len);
cp_tmp += str_len;
*cp_tmp = separator;
memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
FREE_C_HEAP_ARRAY(char, path);
} else {
cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
char* cp_tmp = cp + old_len;
*cp_tmp = separator;
memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
}
}
return cp;
}
// Scan the directory and append any jar or zip files found to path.
// Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
DIR* dir = os::opendir(directory);
if (dir == NULL) return path;
char dir_sep[2] = { '\0', '\0' };
size_t directory_len = strlen(directory);
const char fileSep = *os::file_separator();
if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
/* Scan the directory for jars/zips, appending them to path. */
struct dirent *entry;
char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
const char* name = entry->d_name;
const char* ext = name + strlen(name) - 4;
bool isJarOrZip = ext > name &&
(os::file_name_strcmp(ext, ".jar") == 0 ||
os::file_name_strcmp(ext, ".zip") == 0);
if (isJarOrZip) {
char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
path = add_to_path(path, jarpath, false);
FREE_C_HEAP_ARRAY(char, jarpath);
}
}
FREE_C_HEAP_ARRAY(char, dbuf);
os::closedir(dir);
return path;
}
// Parses a memory size specification string.
static bool atomull(const char *s, julong* result) {
julong n = 0;
int args_read = 0;
bool is_hex = false;
// Skip leading 0[xX] for hexadecimal
if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
s += 2;
is_hex = true;
args_read = sscanf(s, JULONG_FORMAT_X, &n);
} else {
args_read = sscanf(s, JULONG_FORMAT, &n);
}
if (args_read != 1) {
return false;
}
while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
s++;
}
// 4705540: illegal if more characters are found after the first non-digit
if (strlen(s) > 1) {
return false;
}
switch (*s) {
case 'T': case 't':
*result = n * G * K;
// Check for overflow.
if (*result/((julong)G * K) != n) return false;
return true;
case 'G': case 'g':
*result = n * G;
if (*result/G != n) return false;
return true;
case 'M': case 'm':
*result = n * M;
if (*result/M != n) return false;
return true;
case 'K': case 'k':
*result = n * K;
if (*result/K != n) return false;
return true;
case '\0':
*result = n;
return true;
default:
return false;
}
}
Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
if (size < min_size) return arg_too_small;
// Check that size will fit in a size_t (only relevant on 32-bit)
if (size > max_uintx) return arg_too_big;
return arg_in_range;
}
// Describe an argument out of range error
void Arguments::describe_range_error(ArgsRange errcode) {
switch(errcode) {
case arg_too_big:
jio_fprintf(defaultStream::error_stream(),
"The specified size exceeds the maximum "
"representable size.\n");
break;
case arg_too_small:
case arg_unreadable:
case arg_in_range:
// do nothing for now
break;
default:
ShouldNotReachHere();
}
}
static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
return true;
} else {
return false;
}
}
static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
char* end;
errno = 0;
double v = strtod(value, &end);
if ((errno != 0) || (*end != 0)) {
return false;
}
if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
return true;
}
return false;
}
static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
julong v;
int int_v;
intx intx_v;
bool is_neg = false;
// Check the sign first since atomull() parses only unsigned values.
if (*value == '-') {
if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
return false;
}
value++;
is_neg = true;
}
if (!atomull(value, &v)) {
return false;
}
int_v = (int) v;
if (is_neg) {
int_v = -int_v;
}
if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
return true;
}
uint uint_v = (uint) v;
if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
return true;
}
intx_v = (intx) v;
if (is_neg) {
intx_v = -intx_v;
}
if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
return true;
}
uintx uintx_v = (uintx) v;
if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
return true;
}
uint64_t uint64_t_v = (uint64_t) v;
if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
return true;
}
size_t size_t_v = (size_t) v;
if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
return true;
}
return false;
}
static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
// Contract: CommandLineFlags always returns a pointer that needs freeing.
FREE_C_HEAP_ARRAY(char, value);
return true;
}
static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
const char* old_value = "";
if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
size_t old_len = old_value != NULL ? strlen(old_value) : 0;
size_t new_len = strlen(new_value);
const char* value;
char* free_this_too = NULL;
if (old_len == 0) {
value = new_value;
} else if (new_len == 0) {
value = old_value;
} else {
char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
// each new setting adds another LINE to the switch:
sprintf(buf, "%s\n%s", old_value, new_value);
value = buf;
free_this_too = buf;
}
(void) CommandLineFlags::ccstrAtPut(name, &value, origin);
// CommandLineFlags always returns a pointer that needs freeing.
FREE_C_HEAP_ARRAY(char, value);
if (free_this_too != NULL) {
// CommandLineFlags made its own copy, so I must delete my own temp. buffer.
FREE_C_HEAP_ARRAY(char, free_this_too);
}
return true;
}
const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
const char* real_name = real_flag_name(arg);
JDK_Version since = JDK_Version();
switch (is_deprecated_flag(arg, &since)) {
case -1:
return NULL; // obsolete or expired, don't process normally
case 0:
return real_name;
case 1: {
if (warn) {
char version[256];
since.to_string(version, sizeof(version));
if (real_name != arg) {
warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
arg, version, real_name);
} else {
warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
arg, version);
}
}
return real_name;
}
}
ShouldNotReachHere();
return NULL;
}
bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
// range of acceptable characters spelled out for portability reasons
#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
#define BUFLEN 255
char name[BUFLEN+1];
char dummy;
const char* real_name;
bool warn_if_deprecated = true;
if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
if (real_name == NULL) {
return false;
}
return set_bool_flag(real_name, false, origin);
}
if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
if (real_name == NULL) {
return false;
}
return set_bool_flag(real_name, true, origin);
}
char punct;
if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
const char* value = strchr(arg, '=') + 1;
Flag* flag;
// this scanf pattern matches both strings (handled here) and numbers (handled later))
real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
if (real_name == NULL) {
return false;
}
flag = Flag::find_flag(real_name);
if (flag != NULL && flag->is_ccstr()) {
if (flag->ccstr_accumulates()) {
return append_to_string_flag(real_name, value, origin);
} else {
if (value[0] == '\0') {
value = NULL;
}
return set_string_flag(real_name, value, origin);
}
} else {
warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
}
}
if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
const char* value = strchr(arg, '=') + 1;
// -XX:Foo:=xxx will reset the string flag to the given value.
if (value[0] == '\0') {
value = NULL;
}
real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
if (real_name == NULL) {
return false;
}
return set_string_flag(real_name, value, origin);
}
#define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
#define SIGNED_NUMBER_RANGE "[-0123456789]"
#define NUMBER_RANGE "[0123456789eE+-]"
char value[BUFLEN + 1];
char value2[BUFLEN + 1];
if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
// Looks like a floating-point number -- try again with more lenient format string
if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
if (real_name == NULL) {
return false;
}
return set_fp_numeric_flag(real_name, value, origin);
}
}
#define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
if (real_name == NULL) {
return false;
}
return set_numeric_flag(real_name, value, origin);
}
return false;
}
void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
assert(bldarray != NULL, "illegal argument");
if (arg == NULL) {
return;
}
int new_count = *count + 1;
// expand the array and add arg to the last element
if (*bldarray == NULL) {
*bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
} else {
*bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
}
(*bldarray)[*count] = os::strdup_check_oom(arg);
*count = new_count;
}
void Arguments::build_jvm_args(const char* arg) {
add_string(&_jvm_args_array, &_num_jvm_args, arg);
}
void Arguments::build_jvm_flags(const char* arg) {
add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
}
// utility function to return a string that concatenates all
// strings in a given char** array
const char* Arguments::build_resource_string(char** args, int count) {
if (args == NULL || count == 0) {
return NULL;
}
size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
for (int i = 1; i < count; i++) {
length += strlen(args[i]) + 1; // add 1 for a space
}
char* s = NEW_RESOURCE_ARRAY(char, length);
strcpy(s, args[0]);
for (int j = 1; j < count; j++) {
strcat(s, " ");
strcat(s, args[j]);
}
return (const char*) s;
}
void Arguments::print_on(outputStream* st) {
st->print_cr("VM Arguments:");
if (num_jvm_flags() > 0) {
st->print("jvm_flags: "); print_jvm_flags_on(st);
st->cr();
}
if (num_jvm_args() > 0) {
st->print("jvm_args: "); print_jvm_args_on(st);
st->cr();
}
st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
if (_java_class_path != NULL) {
char* path = _java_class_path->value();
st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
}
st->print_cr("Launcher Type: %s", _sun_java_launcher);
}
void Arguments::print_summary_on(outputStream* st) {
// Print the command line. Environment variables that are helpful for
// reproducing the problem are written later in the hs_err file.
// flags are from setting file
if (num_jvm_flags() > 0) {
st->print_raw("Settings File: ");
print_jvm_flags_on(st);
st->cr();
}
// args are the command line and environment variable arguments.
st->print_raw("Command Line: ");
if (num_jvm_args() > 0) {
print_jvm_args_on(st);
}
// this is the classfile and any arguments to the java program
if (java_command() != NULL) {
st->print("%s", java_command());
}
st->cr();
}
void Arguments::print_jvm_flags_on(outputStream* st) {
if (_num_jvm_flags > 0) {
for (int i=0; i < _num_jvm_flags; i++) {
st->print("%s ", _jvm_flags_array[i]);
}
}
}
void Arguments::print_jvm_args_on(outputStream* st) {
if (_num_jvm_args > 0) {
for (int i=0; i < _num_jvm_args; i++) {
st->print("%s ", _jvm_args_array[i]);
}
}
}
bool Arguments::process_argument(const char* arg,
jboolean ignore_unrecognized,
Flag::Flags origin) {
JDK_Version since = JDK_Version();
if (parse_argument(arg, origin) || ignore_unrecognized) {
return true;
}
// Determine if the flag has '+', '-', or '=' characters.
bool has_plus_minus = (*arg == '+' || *arg == '-');
const char* const argname = has_plus_minus ? arg + 1 : arg;
size_t arg_len;
const char* equal_sign = strchr(argname, '=');
if (equal_sign == NULL) {
arg_len = strlen(argname);
} else {
arg_len = equal_sign - argname;
}
// Only make the obsolete check for valid arguments.
if (arg_len <= BUFLEN) {
// Construct a string which consists only of the argument name without '+', '-', or '='.
char stripped_argname[BUFLEN+1];
strncpy(stripped_argname, argname, arg_len);
stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
if (is_obsolete_flag(stripped_argname, &since)) {
char version[256];
since.to_string(version, sizeof(version));
warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
return true;
}
}
// For locked flags, report a custom error message if available.
// Otherwise, report the standard unrecognized VM option.
Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
if (found_flag != NULL) {
char locked_message_buf[BUFLEN];
found_flag->get_locked_message(locked_message_buf, BUFLEN);
if (strlen(locked_message_buf) == 0) {
if (found_flag->is_bool() && !has_plus_minus) {
jio_fprintf(defaultStream::error_stream(),
"Missing +/- setting for VM option '%s'\n", argname);
} else if (!found_flag->is_bool() && has_plus_minus) {
jio_fprintf(defaultStream::error_stream(),
"Unexpected +/- setting in VM option '%s'\n", argname);
} else {
jio_fprintf(defaultStream::error_stream(),
"Improperly specified VM option '%s'\n", argname);
}
} else {
jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
}
} else {
jio_fprintf(defaultStream::error_stream(),
"Unrecognized VM option '%s'\n", argname);
Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
if (fuzzy_matched != NULL) {
jio_fprintf(defaultStream::error_stream(),
"Did you mean '%s%s%s'? ",
(fuzzy_matched->is_bool()) ? "(+/-)" : "",
fuzzy_matched->_name,
(fuzzy_matched->is_bool()) ? "" : "=<value>");
}
}
// allow for commandline "commenting out" options like -XX:#+Verbose
return arg[0] == '#';
}
bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
FILE* stream = fopen(file_name, "rb");
if (stream == NULL) {
if (should_exist) {
jio_fprintf(defaultStream::error_stream(),
"Could not open settings file %s\n", file_name);
return false;
} else {
return true;
}
}
char token[1024];
int pos = 0;
bool in_white_space = true;
bool in_comment = false;
bool in_quote = false;
char quote_c = 0;
bool result = true;
int c = getc(stream);
while(c != EOF && pos < (int)(sizeof(token)-1)) {
if (in_white_space) {
if (in_comment) {
if (c == '\n') in_comment = false;
} else {
if (c == '#') in_comment = true;
else if (!isspace(c)) {
in_white_space = false;
token[pos++] = c;
}
}
} else {
if (c == '\n' || (!in_quote && isspace(c))) {
// token ends at newline, or at unquoted whitespace
// this allows a way to include spaces in string-valued options
token[pos] = '\0';
logOption(token);
result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
build_jvm_flags(token);
pos = 0;
in_white_space = true;
in_quote = false;
} else if (!in_quote && (c == '\'' || c == '"')) {
in_quote = true;
quote_c = c;
} else if (in_quote && (c == quote_c)) {
in_quote = false;
} else {
token[pos++] = c;
}
}
c = getc(stream);
}
if (pos > 0) {
token[pos] = '\0';
result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
build_jvm_flags(token);
}
fclose(stream);
return result;
}
//=============================================================================================================
// Parsing of properties (-D)
const char* Arguments::get_property(const char* key) {
return PropertyList_get_value(system_properties(), key);
}
bool Arguments::add_property(const char* prop) {
const char* eq = strchr(prop, '=');
const char* key;
const char* value = "";
if (eq == NULL) {
// property doesn't have a value, thus use passed string
key = prop;
} else {
// property have a value, thus extract it and save to the
// allocated string
size_t key_len = eq - prop;
char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
strncpy(tmp_key, prop, key_len);
tmp_key[key_len] = '\0';
key = tmp_key;
value = &prop[key_len + 1];
}
if (strcmp(key, "java.compiler") == 0) {
process_java_compiler_argument(value);
// Record value in Arguments, but let it get passed to Java.
} else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
strcmp(key, "sun.java.launcher.pid") == 0) {
// sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
// private and are processed in process_sun_java_launcher_properties();
// the sun.java.launcher property is passed on to the java application
} else if (strcmp(key, "sun.boot.library.path") == 0) {
PropertyList_unique_add(&_system_properties, key, value, true);
} else {
if (strcmp(key, "sun.java.command") == 0) {
if (_java_command != NULL) {
os::free(_java_command);
}
_java_command = os::strdup_check_oom(value, mtInternal);
} else if (strcmp(key, "java.vendor.url.bug") == 0) {
if (_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
assert(_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
os::free((void *)_java_vendor_url_bug);
}
// save it in _java_vendor_url_bug, so JVM fatal error handler can access
// its value without going through the property list or making a Java call.
_java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
}
// Create new property and add at the end of the list
PropertyList_unique_add(&_system_properties, key, value);
}
if (key != prop) {
// SystemProperty copy passed value, thus free previously allocated
// memory
FreeHeap((void *)key);
}
return true;
}
//===========================================================================================================
// Setting int/mixed/comp mode flags
void Arguments::set_mode_flags(Mode mode) {
// Set up default values for all flags.
// If you add a flag to any of the branches below,
// add a default value for it here.
set_java_compiler(false);
_mode = mode;
// Ensure Agent_OnLoad has the correct initial values.
// This may not be the final mode; mode may change later in onload phase.
PropertyList_unique_add(&_system_properties, "java.vm.info",
VM_Version::vm_info_string(), false);
UseInterpreter = true;
UseCompiler = true;
UseLoopCounter = true;
// Default values may be platform/compiler dependent -
// use the saved values
ClipInlining = Arguments::_ClipInlining;
AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
UseOnStackReplacement = Arguments::_UseOnStackReplacement;
BackgroundCompilation = Arguments::_BackgroundCompilation;
if (TieredCompilation) {
if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
}
if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
}
}
// Change from defaults based on mode
switch (mode) {
default:
ShouldNotReachHere();
break;
case _int:
UseCompiler = false;
UseLoopCounter = false;
AlwaysCompileLoopMethods = false;
UseOnStackReplacement = false;
break;
case _mixed:
// same as default
break;
case _comp:
UseInterpreter = false;
BackgroundCompilation = false;
ClipInlining = false;
// Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
// We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
// compile a level 4 (C2) and then continue executing it.
if (TieredCompilation) {
Tier3InvokeNotifyFreqLog = 0;
Tier4InvocationThreshold = 0;
}
break;
}
}
#if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
// Conflict: required to use shared spaces (-Xshare:on), but
// incompatible command line options were chosen.
static void no_shared_spaces(const char* message) {
if (RequireSharedSpaces) {
jio_fprintf(defaultStream::error_stream(),
"Class data sharing is inconsistent with other specified options.\n");
vm_exit_during_initialization("Unable to use shared archive.", message);
} else {
FLAG_SET_DEFAULT(UseSharedSpaces, false);
}
}
#endif
// Returns threshold scaled with the value of scale.
// If scale < 0.0, threshold is returned without scaling.
intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
if (scale == 1.0 || scale < 0.0) {
return threshold;
} else {
return (intx)(threshold * scale);
}
}
// Returns freq_log scaled with the value of scale.
// Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
// If scale < 0.0, freq_log is returned without scaling.
intx Arguments::scaled_freq_log(intx freq_log, double scale) {
// Check if scaling is necessary or if negative value was specified.
if (scale == 1.0 || scale < 0.0) {
return freq_log;
}
// Check values to avoid calculating log2 of 0.
if (scale == 0.0 || freq_log == 0) {
return 0;
}
// Determine the maximum notification frequency value currently supported.
// The largest mask value that the interpreter/C1 can handle is
// of length InvocationCounter::number_of_count_bits. Mask values are always
// one bit shorter then the value of the notification frequency. Set
// max_freq_bits accordingly.
intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
if (scaled_freq == 0) {
// Return 0 right away to avoid calculating log2 of 0.
return 0;
} else if (scaled_freq > nth_bit(max_freq_bits)) {
return max_freq_bits;
} else {
return log2_intptr(scaled_freq);
}
}
void Arguments::set_tiered_flags() {
// With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
}
if (CompilationPolicyChoice < 2) {
vm_exit_during_initialization(
"Incompatible compilation policy selected", NULL);
}
// Increase the code cache size - tiered compiles a lot more.
if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
}
// Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
// Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
}
if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
}
// Check consistency of code heap sizes
if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
jio_fprintf(defaultStream::error_stream(),
"Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
(NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
vm_exit(1);
}
}
}
if (!UseInterpreter) { // -Xcomp
Tier3InvokeNotifyFreqLog = 0;
Tier4InvocationThreshold = 0;
}
if (CompileThresholdScaling < 0) {
vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
}
// Scale tiered compilation thresholds.
// CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
// Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
// once these thresholds become supported.
FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
}
}
#if INCLUDE_ALL_GCS
static void disable_adaptive_size_policy(const char* collector_name) {
if (UseAdaptiveSizePolicy) {
if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
collector_name);
}
FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
}
}
void Arguments::set_parnew_gc_flags() {
assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
"control point invariant");
assert(UseConcMarkSweepGC, "CMS is expected to be on here");
assert(UseParNewGC, "ParNew should always be used with CMS");
if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
} else if (ParallelGCThreads == 0) {
jio_fprintf(defaultStream::error_stream(),
"The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
vm_exit(1);
}
// By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
// these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
// we set them to 1024 and 1024.
// See CR 6362902.
if (FLAG_IS_DEFAULT(YoungPLABSize)) {
FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
}
if (FLAG_IS_DEFAULT(OldPLABSize)) {
FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
}
// When using compressed oops, we use local overflow stacks,
// rather than using a global overflow list chained through
// the klass word of the object's pre-image.
if (UseCompressedOops && !ParGCUseLocalOverflow) {
if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
}
FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
}
assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
}
// Adjust some sizes to suit CMS and/or ParNew needs; these work well on
// sparc/solaris for certain applications, but would gain from
// further optimization and tuning efforts, and would almost
// certainly gain from analysis of platform and environment.
void Arguments::set_cms_and_parnew_gc_flags() {
assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
assert(UseConcMarkSweepGC, "CMS is expected to be on here");
assert(UseParNewGC, "ParNew should always be used with CMS");
// Turn off AdaptiveSizePolicy by default for cms until it is complete.
disable_adaptive_size_policy("UseConcMarkSweepGC");
set_parnew_gc_flags();
size_t max_heap = align_size_down(MaxHeapSize,
CardTableRS::ct_max_alignment_constraint());
// Now make adjustments for CMS
intx tenuring_default = (intx)6;
size_t young_gen_per_worker = CMSYoungGenPerWorker;
// Preferred young gen size for "short" pauses:
// upper bound depends on # of threads and NewRatio.
const size_t preferred_max_new_size_unaligned =
MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
size_t preferred_max_new_size =
align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
// Unless explicitly requested otherwise, size young gen
// for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
// If either MaxNewSize or NewRatio is set on the command line,
// assume the user is trying to set the size of the young gen.
if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
// Set MaxNewSize to our calculated preferred_max_new_size unless
// NewSize was set on the command line and it is larger than
// preferred_max_new_size.
if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
} else {
FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
}
if (PrintGCDetails && Verbose) {
// Too early to use gclog_or_tty
tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
}
// Code along this path potentially sets NewSize and OldSize
if (PrintGCDetails && Verbose) {
// Too early to use gclog_or_tty
tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
" initial_heap_size: " SIZE_FORMAT
" max_heap: " SIZE_FORMAT,
min_heap_size(), InitialHeapSize, max_heap);
}
size_t min_new = preferred_max_new_size;
if (FLAG_IS_CMDLINE(NewSize)) {
min_new = NewSize;
}
if (max_heap > min_new && min_heap_size() > min_new) {
// Unless explicitly requested otherwise, make young gen
// at least min_new, and at most preferred_max_new_size.
if (FLAG_IS_DEFAULT(NewSize)) {
FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
if (PrintGCDetails && Verbose) {
// Too early to use gclog_or_tty
tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
}
}
// Unless explicitly requested otherwise, size old gen
// so it's NewRatio x of NewSize.
if (FLAG_IS_DEFAULT(OldSize)) {
if (max_heap > NewSize) {
FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
if (PrintGCDetails && Verbose) {
// Too early to use gclog_or_tty
tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
}
}
}
}
}
// Unless explicitly requested otherwise, definitely
// promote all objects surviving "tenuring_default" scavenges.
if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
FLAG_IS_DEFAULT(SurvivorRatio)) {
FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
}
// If we decided above (or user explicitly requested)
// `promote all' (via MaxTenuringThreshold := 0),
// prefer minuscule survivor spaces so as not to waste
// space for (non-existent) survivors
if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
}
// OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
// but rather the number of free blocks of a given size that are used when
// replenishing the local per-worker free list caches.
if (FLAG_IS_DEFAULT(OldPLABSize)) {
if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
// OldPLAB sizing manually turned off: Use a larger default setting,
// unless it was manually specified. This is because a too-low value
// will slow down scavenges.
FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
} else {
FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
}
}
// If either of the static initialization defaults have changed, note this
// modification.
if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
}
if (!ClassUnloading) {
FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
}
if (PrintGCDetails && Verbose) {
tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
(unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
}
}
#endif // INCLUDE_ALL_GCS
void set_object_alignment() {
// Object alignment.
assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
MinObjAlignmentInBytes = ObjectAlignmentInBytes;
assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
// Oop encoding heap max
OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
if (SurvivorAlignmentInBytes == 0) {
SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
}
#if INCLUDE_ALL_GCS
// Set CMS global values
CompactibleFreeListSpace::set_cms_values();
#endif // INCLUDE_ALL_GCS
}
size_t Arguments::max_heap_for_compressed_oops() {
// Avoid sign flip.
assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
// We need to fit both the NULL page and the heap into the memory budget, while
// keeping alignment constraints of the heap. To guarantee the latter, as the
// NULL page is located before the heap, we pad the NULL page to the conservative
// maximum alignment that the GC may ever impose upon the heap.
size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
_conservative_max_heap_alignment);
LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
NOT_LP64(ShouldNotReachHere(); return 0);
}
bool Arguments::should_auto_select_low_pause_collector() {
if (UseAutoGCSelectPolicy &&
!FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
(MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
if (PrintGCDetails) {
// Cannot use gclog_or_tty yet.
tty->print_cr("Automatic selection of the low pause collector"
" based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
}
return true;
}
return false;
}
void Arguments::set_use_compressed_oops() {
#ifndef ZERO
#ifdef _LP64
// MaxHeapSize is not set up properly at this point, but
// the only value that can override MaxHeapSize if we are
// to use UseCompressedOops is InitialHeapSize.
size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
if (max_heap_size <= max_heap_for_compressed_oops()) {
#if !defined(COMPILER1) || defined(TIERED)
if (FLAG_IS_DEFAULT(UseCompressedOops)) {
FLAG_SET_ERGO(bool, UseCompressedOops, true);
}
#endif
} else {
if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
warning("Max heap size too large for Compressed Oops");
FLAG_SET_DEFAULT(UseCompressedOops, false);
FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
}
}
#endif // _LP64
#endif // ZERO
}
// NOTE: set_use_compressed_klass_ptrs() must be called after calling
// set_use_compressed_oops().
void Arguments::set_use_compressed_klass_ptrs() {
#ifndef ZERO
#ifdef _LP64
// UseCompressedOops must be on for UseCompressedClassPointers to be on.
if (!UseCompressedOops) {
if (UseCompressedClassPointers) {
warning("UseCompressedClassPointers requires UseCompressedOops");
}
FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
} else {
// Turn on UseCompressedClassPointers too
if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
}
// Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
if (UseCompressedClassPointers) {
if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
}
}
}
#endif // _LP64
#endif // !ZERO
}
void Arguments::set_conservative_max_heap_alignment() {
// The conservative maximum required alignment for the heap is the maximum of
// the alignments imposed by several sources: any requirements from the heap
// itself, the collector policy and the maximum page size we may run the VM
// with.
size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
#if INCLUDE_ALL_GCS
if (UseParallelGC) {
heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
} else if (UseG1GC) {
heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
}
#endif // INCLUDE_ALL_GCS
_conservative_max_heap_alignment = MAX4(heap_alignment,
(size_t)os::vm_allocation_granularity(),
os::max_page_size(),
CollectorPolicy::compute_heap_alignment());
}
void Arguments::select_gc_ergonomically() {
if (os::is_server_class_machine()) {
if (should_auto_select_low_pause_collector()) {
FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
} else {
#if defined(JAVASE_EMBEDDED)
FLAG_SET_ERGO(bool, UseParallelGC, true);
#else
FLAG_SET_ERGO(bool, UseG1GC, true);
#endif
}
} else {
FLAG_SET_ERGO(bool, UseSerialGC, true);
}
}
void Arguments::select_gc() {
if (!gc_selected()) {
select_gc_ergonomically();
guarantee(gc_selected(), "No GC selected");
}
}
void Arguments::set_ergonomics_flags() {
select_gc();
#if defined(COMPILER2) || INCLUDE_JVMCI
// Shared spaces work fine with other GCs but causes bytecode rewriting
// to be disabled, which hurts interpreter performance and decreases
// server performance. When -server is specified, keep the default off
// unless it is asked for. Future work: either add bytecode rewriting
// at link time, or rewrite bytecodes in non-shared methods.
if (!DumpSharedSpaces && !RequireSharedSpaces &&
(FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
}
#endif
set_conservative_max_heap_alignment();
#ifndef ZERO
#ifdef _LP64
set_use_compressed_oops();
// set_use_compressed_klass_ptrs() must be called after calling
// set_use_compressed_oops().
set_use_compressed_klass_ptrs();
// Also checks that certain machines are slower with compressed oops
// in vm_version initialization code.
#endif // _LP64
#endif // !ZERO
CodeCacheExtensions::set_ergonomics_flags();
}
void Arguments::set_parallel_gc_flags() {
assert(UseParallelGC || UseParallelOldGC, "Error");
// Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
FLAG_SET_DEFAULT(UseParallelOldGC, true);
}
FLAG_SET_DEFAULT(UseParallelGC, true);
// If no heap maximum was requested explicitly, use some reasonable fraction
// of the physical memory, up to a maximum of 1GB.
FLAG_SET_DEFAULT(ParallelGCThreads,
Abstract_VM_Version::parallel_worker_threads());
if (ParallelGCThreads == 0) {
jio_fprintf(defaultStream::error_stream(),
"The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
vm_exit(1);
}
if (UseAdaptiveSizePolicy) {
// We don't want to limit adaptive heap sizing's freedom to adjust the heap
// unless the user actually sets these flags.
if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
}
if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
}
}
// If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
// SurvivorRatio has been set, reset their default values to SurvivorRatio +
// 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
// See CR 6362902 for details.
if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
}
if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
}
}
if (UseParallelOldGC) {
// Par compact uses lower default values since they are treated as
// minimums. These are different defaults because of the different
// interpretation and are not ergonomically set.
if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
}
}
}
void Arguments::set_g1_gc_flags() {
assert(UseG1GC, "Error");
#if defined(COMPILER1) || INCLUDE_JVMCI
FastTLABRefill = false;
#endif
FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
if (ParallelGCThreads == 0) {
assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
}
#if INCLUDE_ALL_GCS
if (G1ConcRefinementThreads == 0) {
FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
}
#endif
// MarkStackSize will be set (if it hasn't been set by the user)
// when concurrent marking is initialized.
// Its value will be based upon the number of parallel marking threads.
// But we do set the maximum mark stack size here.
if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
}
if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
// In G1, we want the default GC overhead goal to be higher than
// say in PS. So we set it here to 10%. Otherwise the heap might
// be expanded more aggressively than we would like it to. In
// fact, even 10% seems to not be high enough in some cases
// (especially small GC stress tests that the main thing they do
// is allocation). We might consider increase it further.
FLAG_SET_DEFAULT(GCTimeRatio, 9);
}
if (PrintGCDetails && Verbose) {
tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
(unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
}
}
#if !INCLUDE_ALL_GCS
#ifdef ASSERT
static bool verify_serial_gc_flags() {
return (UseSerialGC &&
!(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
UseParallelGC || UseParallelOldGC));
}
#endif // ASSERT
#endif // INCLUDE_ALL_GCS
void Arguments::set_gc_specific_flags() {
#if INCLUDE_ALL_GCS
// Set per-collector flags
if (UseParallelGC || UseParallelOldGC) {
set_parallel_gc_flags();
} else if (UseConcMarkSweepGC) {
set_cms_and_parnew_gc_flags();
} else if (UseG1GC) {
set_g1_gc_flags();
}
if (AssumeMP && !UseSerialGC) {
if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
warning("If the number of processors is expected to increase from one, then"
" you should configure the number of parallel GC threads appropriately"
" using -XX:ParallelGCThreads=N");
}
}
if (MinHeapFreeRatio == 100) {
// Keeping the heap 100% free is hard ;-) so limit it to 99%.
FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
}
#else // INCLUDE_ALL_GCS
assert(verify_serial_gc_flags(), "SerialGC unset");
#endif // INCLUDE_ALL_GCS
}
julong Arguments::limit_by_allocatable_memory(julong limit) {
julong max_allocatable;
julong result = limit;
if (os::has_allocatable_memory_limit(&max_allocatable)) {
result = MIN2(result, max_allocatable / MaxVirtMemFraction);
}
return result;
}
// Use static initialization to get the default before parsing
static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
void Arguments::set_heap_size() {
const julong phys_mem =
FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
: (julong)MaxRAM;
// If the maximum heap size has not been set with -Xmx,
// then set it as fraction of the size of physical memory,
// respecting the maximum and minimum sizes of the heap.
if (FLAG_IS_DEFAULT(MaxHeapSize)) {
julong reasonable_max = phys_mem / MaxRAMFraction;
if (phys_mem <= MaxHeapSize * MinRAMFraction) {
// Small physical memory, so use a minimum fraction of it for the heap
reasonable_max = phys_mem / MinRAMFraction;
} else {
// Not-small physical memory, so require a heap at least
// as large as MaxHeapSize
reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
}
if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
// Limit the heap size to ErgoHeapSizeLimit
reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
}
if (UseCompressedOops) {
// Limit the heap size to the maximum possible when using compressed oops
julong max_coop_heap = (julong)max_heap_for_compressed_oops();
// HeapBaseMinAddress can be greater than default but not less than.
if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
// matches compressed oops printing flags
if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
jio_fprintf(defaultStream::error_stream(),
"HeapBaseMinAddress must be at least " SIZE_FORMAT
" (" SIZE_FORMAT "G) which is greater than value given "
SIZE_FORMAT "\n",
DefaultHeapBaseMinAddress,
DefaultHeapBaseMinAddress/G,
HeapBaseMinAddress);
}
FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
}
}
if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
// Heap should be above HeapBaseMinAddress to get zero based compressed oops
// but it should be not less than default MaxHeapSize.
max_coop_heap -= HeapBaseMinAddress;
}
reasonable_max = MIN2(reasonable_max, max_coop_heap);
}
reasonable_max = limit_by_allocatable_memory(reasonable_max);
if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
// An initial heap size was specified on the command line,
// so be sure that the maximum size is consistent. Done
// after call to limit_by_allocatable_memory because that
// method might reduce the allocation size.
reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
}
if (PrintGCDetails && Verbose) {
// Cannot use gclog_or_tty yet.
tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
}
FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
}
// If the minimum or initial heap_size have not been set or requested to be set
// ergonomically, set them accordingly.
if (InitialHeapSize == 0 || min_heap_size() == 0) {
julong reasonable_minimum = (julong)(OldSize + NewSize);
reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
if (InitialHeapSize == 0) {
julong reasonable_initial = phys_mem / InitialRAMFraction;
reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
if (PrintGCDetails && Verbose) {
// Cannot use gclog_or_tty yet.
tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
}
FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
}
// If the minimum heap size has not been set (via -Xms),
// synchronize with InitialHeapSize to avoid errors with the default value.
if (min_heap_size() == 0) {
set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
if (PrintGCDetails && Verbose) {
// Cannot use gclog_or_tty yet.
tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
}
}
}
}
// This option inspects the machine and attempts to set various
// parameters to be optimal for long-running, memory allocation
// intensive jobs. It is intended for machines with large
// amounts of cpu and memory.
jint Arguments::set_aggressive_heap_flags() {
// initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
// VM, but we may not be able to represent the total physical memory
// available (like having 8gb of memory on a box but using a 32bit VM).
// Thus, we need to make sure we're using a julong for intermediate
// calculations.
julong initHeapSize;
julong total_memory = os::physical_memory();
if (total_memory < (julong) 256 * M) {
jio_fprintf(defaultStream::error_stream(),
"You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
vm_exit(1);
}
// The heap size is half of available memory, or (at most)
// all of possible memory less 160mb (leaving room for the OS
// when using ISM). This is the maximum; because adaptive sizing
// is turned on below, the actual space used may be smaller.
initHeapSize = MIN2(total_memory / (julong) 2,
total_memory - (julong) 160 * M);
initHeapSize = limit_by_allocatable_memory(initHeapSize);
if (FLAG_IS_DEFAULT(MaxHeapSize)) {
if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// Currently the minimum size and the initial heap sizes are the same.
set_min_heap_size(initHeapSize);
}
if (FLAG_IS_DEFAULT(NewSize)) {
// Make the young generation 3/8ths of the total heap.
if (FLAG_SET_CMDLINE(size_t, NewSize,
((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
}
#if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
FLAG_SET_DEFAULT(UseLargePages, true);
#endif
// Increase some data structure sizes for efficiency
if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// See the OldPLABSize comment below, but replace 'after promotion'
// with 'after copying'. YoungPLABSize is the size of the survivor
// space per-gc-thread buffers. The default is 4kw.
if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
return JNI_EINVAL;
}
// OldPLABSize is the size of the buffers in the old gen that
// UseParallelGC uses to promote live data that doesn't fit in the
// survivor spaces. At any given time, there's one for each gc thread.
// The default size is 1kw. These buffers are rarely used, since the
// survivor spaces are usually big enough. For specjbb, however, there
// are occasions when there's lots of live data in the young gen
// and we end up promoting some of it. We don't have a definite
// explanation for why bumping OldPLABSize helps, but the theory
// is that a bigger PLAB results in retaining something like the
// original allocation order after promotion, which improves mutator
// locality. A minor effect may be that larger PLABs reduce the
// number of PLAB allocation events during gc. The value of 8kw
// was arrived at by experimenting with specjbb.
if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
return JNI_EINVAL;
}
// Enable parallel GC and adaptive generation sizing
if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
FLAG_SET_DEFAULT(ParallelGCThreads,
Abstract_VM_Version::parallel_worker_threads());
// Encourage steady state memory management
if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// This appears to improve mutator locality
if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// Get around early Solaris scheduling bug
// (affinity vs other jobs on system)
// but disallow DR and offlining (5008695).
if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
return JNI_OK;
}
// This must be called after ergonomics.
void Arguments::set_bytecode_flags() {
if (!RewriteBytecodes) {
FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
}
}
// Aggressive optimization flags -XX:+AggressiveOpts
jint Arguments::set_aggressive_opts_flags() {
#ifdef COMPILER2
if (AggressiveUnboxing) {
if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
FLAG_SET_DEFAULT(EliminateAutoBox, true);
} else if (!EliminateAutoBox) {
// warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
AggressiveUnboxing = false;
}
if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
} else if (!DoEscapeAnalysis) {
// warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
AggressiveUnboxing = false;
}
}
if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
FLAG_SET_DEFAULT(EliminateAutoBox, true);
}
if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
}
// Feed the cache size setting into the JDK
char buffer[1024];
sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
if (!add_property(buffer)) {
return JNI_ENOMEM;
}
}
if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
}
#endif
if (AggressiveOpts) {
// Sample flag setting code
// if (FLAG_IS_DEFAULT(EliminateZeroing)) {
// FLAG_SET_DEFAULT(EliminateZeroing, true);
// }
}
return JNI_OK;
}
//===========================================================================================================
// Parsing of java.compiler property
void Arguments::process_java_compiler_argument(const char* arg) {
// For backwards compatibility, Djava.compiler=NONE or ""
// causes us to switch to -Xint mode UNLESS -Xdebug
// is also specified.
if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
}
}
void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
_sun_java_launcher = os::strdup_check_oom(launcher);
}
bool Arguments::created_by_java_launcher() {
assert(_sun_java_launcher != NULL, "property must have value");
return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
}
bool Arguments::sun_java_launcher_is_altjvm() {
return _sun_java_launcher_is_altjvm;
}
//===========================================================================================================
// Parsing of main arguments
// check if do gclog rotation
// +UseGCLogFileRotation is a must,
// no gc log rotation when log file not supplied or
// NumberOfGCLogFiles is 0
void check_gclog_consistency() {
if (UseGCLogFileRotation) {
if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
jio_fprintf(defaultStream::output_stream(),
"To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
"where num_of_file > 0\n"
"GC log rotation is turned off\n");
UseGCLogFileRotation = false;
}
}
if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
jio_fprintf(defaultStream::output_stream(),
"GCLogFileSize changed to minimum 8K\n");
}
}
}
// This function is called for -Xloggc:<filename>, it can be used
// to check if a given file name(or string) conforms to the following
// specification:
// A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
// %p and %t only allowed once. We only limit usage of filename not path
bool is_filename_valid(const char *file_name) {
const char* p = file_name;
char file_sep = os::file_separator()[0];
const char* cp;
// skip prefix path
for (cp = file_name; *cp != '\0'; cp++) {
if (*cp == '/' || *cp == file_sep) {
p = cp + 1;
}
}
int count_p = 0;
int count_t = 0;
while (*p != '\0') {
if ((*p >= '0' && *p <= '9') ||
(*p >= 'A' && *p <= 'Z') ||
(*p >= 'a' && *p <= 'z') ||
*p == '-' ||
*p == '_' ||
*p == '.') {
p++;
continue;
}
if (*p == '%') {
if(*(p + 1) == 'p') {
p += 2;
count_p ++;
continue;
}
if (*(p + 1) == 't') {
p += 2;
count_t ++;
continue;
}
}
return false;
}
return count_p < 2 && count_t < 2;
}
// Check consistency of GC selection
bool Arguments::check_gc_consistency() {
check_gclog_consistency();
// Ensure that the user has not selected conflicting sets
// of collectors.
uint i = 0;
if (UseSerialGC) i++;
if (UseConcMarkSweepGC) i++;
if (UseParallelGC || UseParallelOldGC) i++;
if (UseG1GC) i++;
if (i > 1) {
jio_fprintf(defaultStream::error_stream(),
"Conflicting collector combinations in option list; "
"please refer to the release notes for the combinations "
"allowed\n");
return false;
}
if (UseConcMarkSweepGC && !UseParNewGC) {
jio_fprintf(defaultStream::error_stream(),
"It is not possible to combine the DefNew young collector with the CMS collector.\n");
return false;
}
if (UseParNewGC && !UseConcMarkSweepGC) {
jio_fprintf(defaultStream::error_stream(),
"It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
return false;
}
return true;
}
// Check the consistency of vm_init_args
bool Arguments::check_vm_args_consistency() {
// Method for adding checks for flag consistency.
// The intent is to warn the user of all possible conflicts,
// before returning an error.
// Note: Needs platform-dependent factoring.
bool status = true;
if (TLABRefillWasteFraction == 0) {
jio_fprintf(defaultStream::error_stream(),
"TLABRefillWasteFraction should be a denominator, "
"not " SIZE_FORMAT "\n",
TLABRefillWasteFraction);
status = false;
}
if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
}
if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
}
if (GCTimeLimit == 100) {
// Turn off gc-overhead-limit-exceeded checks
FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
}
status = status && check_gc_consistency();
// CMS space iteration, which FLSVerifyAllHeapreferences entails,
// insists that we hold the requisite locks so that the iteration is
// MT-safe. For the verification at start-up and shut-down, we don't
// yet have a good way of acquiring and releasing these locks,
// which are not visible at the CollectedHeap level. We want to
// be able to acquire these locks and then do the iteration rather
// than just disable the lock verification. This will be fixed under
// bug 4788986.
if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
if (VerifyDuringStartup) {
warning("Heap verification at start-up disabled "
"(due to current incompatibility with FLSVerifyAllHeapReferences)");
VerifyDuringStartup = false; // Disable verification at start-up
}
if (VerifyBeforeExit) {
warning("Heap verification at shutdown disabled "
"(due to current incompatibility with FLSVerifyAllHeapReferences)");
VerifyBeforeExit = false; // Disable verification at shutdown
}
}
if (PrintNMTStatistics) {
#if INCLUDE_NMT
if (MemTracker::tracking_level() == NMT_off) {
#endif // INCLUDE_NMT
warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
PrintNMTStatistics = false;
#if INCLUDE_NMT
}
#endif
}
#if INCLUDE_JVMCI
if (EnableJVMCI) {
if (!ScavengeRootsInCode) {
warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
ScavengeRootsInCode = 1;
}
if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
TypeProfileLevel = 0;
}
if (UseJVMCICompiler) {
if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
TypeProfileWidth = 8;
}
}
}
#endif
// Check lower bounds of the code cache
// Template Interpreter code is approximately 3X larger in debug builds.
uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
jio_fprintf(defaultStream::error_stream(),
"Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
os::vm_page_size()/K);
status = false;
} else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
jio_fprintf(defaultStream::error_stream(),
"Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
status = false;
} else if (ReservedCodeCacheSize < min_code_cache_size) {
jio_fprintf(defaultStream::error_stream(),
"Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
min_code_cache_size/K);
status = false;
} else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
// Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
jio_fprintf(defaultStream::error_stream(),
"Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
CODE_CACHE_SIZE_LIMIT/M);
status = false;
} else if (NonNMethodCodeHeapSize < min_code_cache_size){
jio_fprintf(defaultStream::error_stream(),
"Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
min_code_cache_size/K);
status = false;
} else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
&& (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
jio_fprintf(defaultStream::error_stream(),
"Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
(NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
status = false;
}
if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
}
return status;
}
bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
const char* option_type) {
if (ignore) return false;
const char* spacer = " ";
if (option_type == NULL) {
option_type = ++spacer; // Set both to the empty string.
}
if (os::obsolete_option(option)) {
jio_fprintf(defaultStream::error_stream(),
"Obsolete %s%soption: %s\n", option_type, spacer,
option->optionString);
return false;
} else {
jio_fprintf(defaultStream::error_stream(),
"Unrecognized %s%soption: %s\n", option_type, spacer,
option->optionString);
return true;
}
}
static const char* user_assertion_options[] = {
"-da", "-ea", "-disableassertions", "-enableassertions", 0
};
static const char* system_assertion_options[] = {
"-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
};
bool Arguments::parse_uintx(const char* value,
uintx* uintx_arg,
uintx min_size) {
// Check the sign first since atomull() parses only unsigned values.
bool value_is_positive = !(*value == '-');
if (value_is_positive) {
julong n;
bool good_return = atomull(value, &n);
if (good_return) {
bool above_minimum = n >= min_size;
bool value_is_too_large = n > max_uintx;
if (above_minimum && !value_is_too_large) {
*uintx_arg = n;
return true;
}
}
}
return false;
}
Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
julong* long_arg,
julong min_size) {
if (!atomull(s, long_arg)) return arg_unreadable;
return check_memory_size(*long_arg, min_size);
}
// Parse JavaVMInitArgs structure
jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
const JavaVMInitArgs *java_options_args,
const JavaVMInitArgs *cmd_line_args) {
// For components of the system classpath.
SysClassPath scp(Arguments::get_sysclasspath());
bool scp_assembly_required = false;
// Save default settings for some mode flags
Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
Arguments::_UseOnStackReplacement = UseOnStackReplacement;
Arguments::_ClipInlining = ClipInlining;
Arguments::_BackgroundCompilation = BackgroundCompilation;
if (TieredCompilation) {
Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
}
// Setup flags for mixed which is the default
set_mode_flags(_mixed);
// Parse args structure generated from JAVA_TOOL_OPTIONS environment
// variable (if present).
jint result = parse_each_vm_init_arg(
java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
if (result != JNI_OK) {
return result;
}
// Parse args structure generated from the command line flags.
result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
Flag::COMMAND_LINE);
if (result != JNI_OK) {
return result;
}
// Parse args structure generated from the _JAVA_OPTIONS environment
// variable (if present) (mimics classic VM)
result = parse_each_vm_init_arg(
java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
if (result != JNI_OK) {
return result;
}
// Do final processing now that all arguments have been parsed
result = finalize_vm_init_args(&scp, scp_assembly_required);
if (result != JNI_OK) {
return result;
}
return JNI_OK;
}
// Checks if name in command-line argument -agent{lib,path}:name[=options]
// represents a valid JDWP agent. is_path==true denotes that we
// are dealing with -agentpath (case where name is a path), otherwise with
// -agentlib
bool valid_jdwp_agent(char *name, bool is_path) {
char *_name;
const char *_jdwp = "jdwp";
size_t _len_jdwp, _len_prefix;
if (is_path) {
if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
return false;
}
_name++; // skip past last path separator
_len_prefix = strlen(JNI_LIB_PREFIX);
if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
return false;
}
_name += _len_prefix;
_len_jdwp = strlen(_jdwp);
if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
_name += _len_jdwp;
}
else {
return false;
}
if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
return false;
}
return true;
}
if (strcmp(name, _jdwp) == 0) {
return true;
}
return false;
}
jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
SysClassPath* scp_p,
bool* scp_assembly_required_p,
Flag::Flags origin) {
// Remaining part of option string
const char* tail;
// iterate over arguments
for (int index = 0; index < args->nOptions; index++) {
bool is_absolute_path = false; // for -agentpath vs -agentlib
const JavaVMOption* option = args->options + index;
if (!match_option(option, "-Djava.class.path", &tail) &&
!match_option(option, "-Dsun.java.command", &tail) &&
!match_option(option, "-Dsun.java.launcher", &tail)) {
// add all jvm options to the jvm_args string. This string
// is used later to set the java.vm.args PerfData string constant.
// the -Djava.class.path and the -Dsun.java.command options are
// omitted from jvm_args string as each have their own PerfData
// string constant object.
build_jvm_args(option->optionString);
}
// -verbose:[class/gc/jni]
if (match_option(option, "-verbose", &tail)) {
if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (!strcmp(tail, ":gc")) {
if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (!strcmp(tail, ":jni")) {
if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
}
// -da / -ea / -disableassertions / -enableassertions
// These accept an optional class/package name separated by a colon, e.g.,
// -da:java.lang.Thread.
} else if (match_option(option, user_assertion_options, &tail, true)) {
bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
if (*tail == '\0') {
JavaAssertions::setUserClassDefault(enable);
} else {
assert(*tail == ':', "bogus match by match_option()");
JavaAssertions::addOption(tail + 1, enable);
}
// -dsa / -esa / -disablesystemassertions / -enablesystemassertions
} else if (match_option(option, system_assertion_options, &tail, false)) {
bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
JavaAssertions::setSystemClassDefault(enable);
// -bootclasspath:
} else if (match_option(option, "-Xbootclasspath:", &tail)) {
scp_p->reset_path(tail);
*scp_assembly_required_p = true;
// -bootclasspath/a:
} else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
scp_p->add_suffix(tail);
*scp_assembly_required_p = true;
// -bootclasspath/p:
} else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
scp_p->add_prefix(tail);
*scp_assembly_required_p = true;
// -Xrun
} else if (match_option(option, "-Xrun", &tail)) {
if (tail != NULL) {
const char* pos = strchr(tail, ':');
size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
name[len] = '\0';
char *options = NULL;
if(pos != NULL) {
size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
}
#if !INCLUDE_JVMTI
if (strcmp(name, "jdwp") == 0) {
jio_fprintf(defaultStream::error_stream(),
"Debugging agents are not supported in this VM\n");
return JNI_ERR;
}
#endif // !INCLUDE_JVMTI
add_init_library(name, options);
}
// -agentlib and -agentpath
} else if (match_option(option, "-agentlib:", &tail) ||
(is_absolute_path = match_option(option, "-agentpath:", &tail))) {
if(tail != NULL) {
const char* pos = strchr(tail, '=');
size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
name[len] = '\0';
char *options = NULL;
if(pos != NULL) {
options = os::strdup_check_oom(pos + 1, mtInternal);
}
#if !INCLUDE_JVMTI
if (valid_jdwp_agent(name, is_absolute_path)) {
jio_fprintf(defaultStream::error_stream(),
"Debugging agents are not supported in this VM\n");
return JNI_ERR;
}
#endif // !INCLUDE_JVMTI
add_init_agent(name, options, is_absolute_path);
}
// -javaagent
} else if (match_option(option, "-javaagent:", &tail)) {
#if !INCLUDE_JVMTI
jio_fprintf(defaultStream::error_stream(),
"Instrumentation agents are not supported in this VM\n");
return JNI_ERR;
#else
if(tail != NULL) {
char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
add_init_agent("instrument", options, false);
}
#endif // !INCLUDE_JVMTI
// -Xnoclassgc
} else if (match_option(option, "-Xnoclassgc")) {
if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xconcgc
} else if (match_option(option, "-Xconcgc")) {
if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xnoconcgc
} else if (match_option(option, "-Xnoconcgc")) {
if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xbatch
} else if (match_option(option, "-Xbatch")) {
if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xmn for compatibility with other JVM vendors
} else if (match_option(option, "-Xmn", &tail)) {
julong long_initial_young_size = 0;
ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid initial young generation size: %s\n", option->optionString);
describe_range_error(errcode);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xms
} else if (match_option(option, "-Xms", &tail)) {
julong long_initial_heap_size = 0;
// an initial heap size of 0 means automatically determine
ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid initial heap size: %s\n", option->optionString);
describe_range_error(errcode);
return JNI_EINVAL;
}
set_min_heap_size((size_t)long_initial_heap_size);
// Currently the minimum size and the initial heap sizes are the same.
// Can be overridden with -XX:InitialHeapSize.
if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xmx
} else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
julong long_max_heap_size = 0;
ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid maximum heap size: %s\n", option->optionString);
describe_range_error(errcode);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// Xmaxf
} else if (match_option(option, "-Xmaxf", &tail)) {
char* err;
int maxf = (int)(strtod(tail, &err) * 100);
if (*err != '\0' || *tail == '\0') {
jio_fprintf(defaultStream::error_stream(),
"Bad max heap free percentage size: %s\n",
option->optionString);
return JNI_EINVAL;
} else {
if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
return JNI_EINVAL;
}
}
// Xminf
} else if (match_option(option, "-Xminf", &tail)) {
char* err;
int minf = (int)(strtod(tail, &err) * 100);
if (*err != '\0' || *tail == '\0') {
jio_fprintf(defaultStream::error_stream(),
"Bad min heap free percentage size: %s\n",
option->optionString);
return JNI_EINVAL;
} else {
if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
return JNI_EINVAL;
}
}
// -Xss
} else if (match_option(option, "-Xss", &tail)) {
julong long_ThreadStackSize = 0;
ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid thread stack size: %s\n", option->optionString);
describe_range_error(errcode);
return JNI_EINVAL;
}
// Internally track ThreadStackSize in units of 1024 bytes.
if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
} else if (match_option(option, "-Xoss", &tail) ||
match_option(option, "-Xsqnopause") ||
match_option(option, "-Xoptimize") ||
match_option(option, "-Xboundthreads")) {
// All these options are deprecated in JDK 9 and will be removed in a future release
char version[256];
JDK_Version::jdk(9).to_string(version, sizeof(version));
warning("Ignoring option %s; support was removed in %s", option->optionString, version);
} else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
julong long_CodeCacheExpansionSize = 0;
ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid argument: %s. Must be at least %luK.\n", option->optionString,
os::vm_page_size()/K);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
julong long_ReservedCodeCacheSize = 0;
ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid maximum code cache size: %s.\n", option->optionString);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -XX:NonNMethodCodeHeapSize=
} else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
julong long_NonNMethodCodeHeapSize = 0;
ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -XX:ProfiledCodeHeapSize=
} else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
julong long_ProfiledCodeHeapSize = 0;
ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid maximum profiled code heap size: %s.\n", option->optionString);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -XX:NonProfiledCodeHeapSizee=
} else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
julong long_NonProfiledCodeHeapSize = 0;
ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
if (errcode != arg_in_range) {
jio_fprintf(defaultStream::error_stream(),
"Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -green
} else if (match_option(option, "-green")) {
jio_fprintf(defaultStream::error_stream(),
"Green threads support not available\n");
return JNI_EINVAL;
// -native
} else if (match_option(option, "-native")) {
// HotSpot always uses native threads, ignore silently for compatibility
// -Xrs
} else if (match_option(option, "-Xrs")) {
// Classic/EVM option, new functionality
if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (match_option(option, "-Xusealtsigs")) {
// change default internal VM signals used - lower case for back compat
if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xprof
} else if (match_option(option, "-Xprof")) {
#if INCLUDE_FPROF
_has_profile = true;
#else // INCLUDE_FPROF
jio_fprintf(defaultStream::error_stream(),
"Flat profiling is not supported in this VM.\n");
return JNI_ERR;
#endif // INCLUDE_FPROF
// -Xconcurrentio
} else if (match_option(option, "-Xconcurrentio")) {
if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
return JNI_EINVAL;
}
// -Xinternalversion
} else if (match_option(option, "-Xinternalversion")) {
jio_fprintf(defaultStream::output_stream(), "%s\n",
VM_Version::internal_vm_info_string());
vm_exit(0);
#ifndef PRODUCT
// -Xprintflags
} else if (match_option(option, "-Xprintflags")) {
CommandLineFlags::printFlags(tty, false);
vm_exit(0);
#endif
// -D
} else if (match_option(option, "-D", &tail)) {
const char* value;
if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
*value!= '\0' && strcmp(value, "\"\"") != 0) {
// abort if -Djava.endorsed.dirs is set
jio_fprintf(defaultStream::output_stream(),
"-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
"in modular form will be supported via the concept of upgradeable modules.\n", value);
return JNI_EINVAL;
}
if (match_option(option, "-Djava.ext.dirs=", &value) &&
*value != '\0' && strcmp(value, "\"\"") != 0) {
// abort if -Djava.ext.dirs is set
jio_fprintf(defaultStream::output_stream(),
"-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
return JNI_EINVAL;
}
if (!add_property(tail)) {
return JNI_ENOMEM;
}
// Out of the box management support
if (match_option(option, "-Dcom.sun.management", &tail)) {
#if INCLUDE_MANAGEMENT
if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
#else
jio_fprintf(defaultStream::output_stream(),
"-Dcom.sun.management is not supported in this VM.\n");
return JNI_ERR;
#endif
}
// -Xint
} else if (match_option(option, "-Xint")) {
set_mode_flags(_int);
// -Xmixed
} else if (match_option(option, "-Xmixed")) {
set_mode_flags(_mixed);
// -Xcomp
} else if (match_option(option, "-Xcomp")) {
// for testing the compiler; turn off all flags that inhibit compilation
set_mode_flags(_comp);
// -Xshare:dump
} else if (match_option(option, "-Xshare:dump")) {
if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
set_mode_flags(_int); // Prevent compilation, which creates objects
// -Xshare:on
} else if (match_option(option, "-Xshare:on")) {
if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xshare:auto
} else if (match_option(option, "-Xshare:auto")) {
if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xshare:off
} else if (match_option(option, "-Xshare:off")) {
if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// -Xverify
} else if (match_option(option, "-Xverify", &tail)) {
if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (strcmp(tail, ":remote") == 0) {
if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (strcmp(tail, ":none") == 0) {
if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
return JNI_EINVAL;
}
// -Xdebug
} else if (match_option(option, "-Xdebug")) {
// note this flag has been used, then ignore
set_xdebug_mode(true);
// -Xnoagent
} else if (match_option(option, "-Xnoagent")) {
// For compatibility with classic. HotSpot refuses to load the old style agent.dll.
} else if (match_option(option, "-Xloggc:", &tail)) {
// Redirect GC output to the file. -Xloggc:<filename>
// ostream_init_log(), when called will use this filename
// to initialize a fileStream.
_gc_log_filename = os::strdup_check_oom(tail);
if (!is_filename_valid(_gc_log_filename)) {
jio_fprintf(defaultStream::output_stream(),
"Invalid file name for use with -Xloggc: Filename can only contain the "
"characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
"Note %%p or %%t can only be used once\n", _gc_log_filename);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (match_option(option, "-Xlog", &tail)) {
bool ret = false;
if (strcmp(tail, ":help") == 0) {
LogConfiguration::print_command_line_help(defaultStream::output_stream());
vm_exit(0);
} else if (strcmp(tail, ":disable") == 0) {
LogConfiguration::disable_logging();
ret = true;
} else if (*tail == '\0') {
ret = LogConfiguration::parse_command_line_arguments();
assert(ret, "-Xlog without arguments should never fail to parse");
} else if (*tail == ':') {
ret = LogConfiguration::parse_command_line_arguments(tail + 1);
}
if (ret == false) {
jio_fprintf(defaultStream::error_stream(),
"Invalid -Xlog option '-Xlog%s'\n",
tail);
return JNI_EINVAL;
}
// JNI hooks
} else if (match_option(option, "-Xcheck", &tail)) {
if (!strcmp(tail, ":jni")) {
#if !INCLUDE_JNI_CHECK
warning("JNI CHECKING is not supported in this VM");
#else
CheckJNICalls = true;
#endif // INCLUDE_JNI_CHECK
} else if (is_bad_option(option, args->ignoreUnrecognized,
"check")) {
return JNI_EINVAL;
}
} else if (match_option(option, "vfprintf")) {
_vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
} else if (match_option(option, "exit")) {
_exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
} else if (match_option(option, "abort")) {
_abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
// -XX:+AggressiveHeap
} else if (match_option(option, "-XX:+AggressiveHeap")) {
jint result = set_aggressive_heap_flags();
if (result != JNI_OK) {
return result;
}
// Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
// and the last option wins.
} else if (match_option(option, "-XX:+NeverTenure")) {
if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (match_option(option, "-XX:+AlwaysTenure")) {
if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
uintx max_tenuring_thresh = 0;
if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
jio_fprintf(defaultStream::error_stream(),
"Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (MaxTenuringThreshold == 0) {
if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else {
if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
}
} else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
} else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
#if defined(DTRACE_ENABLED)
if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
#else // defined(DTRACE_ENABLED)
jio_fprintf(defaultStream::error_stream(),
"ExtendedDTraceProbes flag is not applicable for this configuration\n");
return JNI_EINVAL;
#endif // defined(DTRACE_ENABLED)
#ifdef ASSERT
} else if (match_option(option, "-XX:+FullGCALot")) {
if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
// disable scavenge before parallel mark-compact
if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
return JNI_EINVAL;
}
#endif
#if !INCLUDE_MANAGEMENT
} else if (match_option(option, "-XX:+ManagementServer")) {
jio_fprintf(defaultStream::error_stream(),
"ManagementServer is not supported in this VM.\n");
return JNI_ERR;
#endif // INCLUDE_MANAGEMENT
} else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
// Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
// already been handled
if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
(strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
return JNI_EINVAL;
}
}
// Unknown option
} else if (is_bad_option(option, args->ignoreUnrecognized)) {
return JNI_ERR;
}
}
// PrintSharedArchiveAndExit will turn on
// -Xshare:on
// -XX:+TraceClassPaths
if (PrintSharedArchiveAndExit) {
if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
return JNI_EINVAL;
}
}
// Change the default value for flags which have different default values
// when working with older JDKs.
#ifdef LINUX
if (JDK_Version::current().compare_major(6) <= 0 &&
FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
}
#endif // LINUX
fix_appclasspath();
return JNI_OK;
}
// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
//
// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
// path is treated as the current directory.
//
// This causes problems with CDS, which requires that all directories specified in the classpath
// must be empty. In most cases, applications do NOT want to load classes from the current
// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
// scripts compatible with CDS.
void Arguments::fix_appclasspath() {
if (IgnoreEmptyClassPaths) {
const char separator = *os::path_separator();
const char* src = _java_class_path->value();
// skip over all the leading empty paths
while (*src == separator) {
src ++;
}
char* copy = os::strdup_check_oom(src, mtInternal);
// trim all trailing empty paths
for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
*tail = '\0';
}
char from[3] = {separator, separator, '\0'};
char to [2] = {separator, '\0'};
while (StringUtils::replace_no_expand(copy, from, to) > 0) {
// Keep replacing "::" -> ":" until we have no more "::" (non-windows)
// Keep replacing ";;" -> ";" until we have no more ";;" (windows)
}
_java_class_path->set_value(copy);
FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
}
if (!PrintSharedArchiveAndExit) {
ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
}
}
static bool has_jar_files(const char* directory) {
DIR* dir = os::opendir(directory);
if (dir == NULL) return false;
struct dirent *entry;
char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
bool hasJarFile = false;
while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
const char* name = entry->d_name;
const char* ext = name + strlen(name) - 4;
hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
}
FREE_C_HEAP_ARRAY(char, dbuf);
os::closedir(dir);
return hasJarFile ;
}
static int check_non_empty_dirs(const char* path) {
const char separator = *os::path_separator();
const char* const end = path + strlen(path);
int nonEmptyDirs = 0;
while (path < end) {
const char* tmp_end = strchr(path, separator);
if (tmp_end == NULL) {
if (has_jar_files(path)) {
nonEmptyDirs++;
jio_fprintf(defaultStream::output_stream(),
"Non-empty directory: %s\n", path);
}
path = end;
} else {
char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
memcpy(dirpath, path, tmp_end - path);
dirpath[tmp_end - path] = '\0';
if (has_jar_files(dirpath)) {
nonEmptyDirs++;
jio_fprintf(defaultStream::output_stream(),
"Non-empty directory: %s\n", dirpath);
}
FREE_C_HEAP_ARRAY(char, dirpath);
path = tmp_end + 1;
}
}
return nonEmptyDirs;
}
jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
// check if the default lib/endorsed directory exists; if so, error
char path[JVM_MAXPATHLEN];
const char* fileSep = os::file_separator();
sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
#if INCLUDE_JVMCI
jint res = JVMCIRuntime::save_options(_system_properties);
if (res != JNI_OK) {
return res;
}
if (EnableJVMCI) {
// Append lib/jvmci/*.jar to boot class path
char jvmciDir[JVM_MAXPATHLEN];
const char* fileSep = os::file_separator();
jio_snprintf(jvmciDir, sizeof(jvmciDir), "%s%slib%sjvmci", Arguments::get_java_home(), fileSep, fileSep);
DIR* dir = os::opendir(jvmciDir);
if (dir != NULL) {
struct dirent *entry;
char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(jvmciDir), mtInternal);
while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
const char* name = entry->d_name;
const char* ext = name + strlen(name) - 4;
if (ext > name && strcmp(ext, ".jar") == 0) {
char fileName[JVM_MAXPATHLEN];
jio_snprintf(fileName, sizeof(fileName), "%s%s%s", jvmciDir, fileSep, name);
scp_p->add_suffix(fileName);
scp_assembly_required = true;
}
}
FREE_C_HEAP_ARRAY(char, dbuf);
os::closedir(dir);
}
}
#endif // INCLUDE_JVMCI
if (CheckEndorsedAndExtDirs) {
int nonEmptyDirs = 0;
// check endorsed directory
nonEmptyDirs += check_non_empty_dirs(path);
// check the extension directories
nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
if (nonEmptyDirs > 0) {
return JNI_ERR;
}
}
DIR* dir = os::opendir(path);
if (dir != NULL) {
jio_fprintf(defaultStream::output_stream(),
"<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
"in modular form will be supported via the concept of upgradeable modules.\n");
os::closedir(dir);
return JNI_ERR;
}
sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
dir = os::opendir(path);
if (dir != NULL) {
jio_fprintf(defaultStream::output_stream(),
"<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
"Use -classpath instead.\n.");
os::closedir(dir);
return JNI_ERR;
}
if (scp_assembly_required) {
// Assemble the bootclasspath elements into the final path.
char *combined_path = scp_p->combined_path();
Arguments::set_sysclasspath(combined_path);
FREE_C_HEAP_ARRAY(char, combined_path);
}
// This must be done after all arguments have been processed.
// java_compiler() true means set to "NONE" or empty.
if (java_compiler() && !xdebug_mode()) {
// For backwards compatibility, we switch to interpreted mode if
// -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
// not specified.
set_mode_flags(_int);
}
// CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
// but like -Xint, leave compilation thresholds unaffected.
// With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
set_mode_flags(_int);
}
// eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
}
#if !defined(COMPILER2) && !INCLUDE_JVMCI
// Don't degrade server performance for footprint
if (FLAG_IS_DEFAULT(UseLargePages) &&
MaxHeapSize < LargePageHeapSizeThreshold) {
// No need for large granularity pages w/small heaps.
// Note that large pages are enabled/disabled for both the
// Java heap and the code cache.
FLAG_SET_DEFAULT(UseLargePages, false);
}
#elif defined(COMPILER2)
if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
}
#endif
#ifndef TIERED
// Tiered compilation is undefined.
UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
#endif
// If we are running in a headless jre, force java.awt.headless property
// to be true unless the property has already been set.
// Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
if (os::is_headless_jre()) {
const char* headless = Arguments::get_property("java.awt.headless");
if (headless == NULL) {
const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
if (headless_env == NULL) {
if (!add_property("java.awt.headless=true")) {
return JNI_ENOMEM;
}
} else {
char buffer[256];
jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
if (!add_property(buffer)) {
return JNI_ENOMEM;
}
}
}
}
if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
// CMS can only be used with ParNew
FLAG_SET_ERGO(bool, UseParNewGC, true);
}
if (!check_vm_args_consistency()) {
return JNI_ERR;
}
return JNI_OK;
}
// Helper class for controlling the lifetime of JavaVMInitArgs
// objects. The contents of the JavaVMInitArgs are guaranteed to be
// deleted on the destruction of the ScopedVMInitArgs object.
class ScopedVMInitArgs : public StackObj {
private:
JavaVMInitArgs _args;
bool _is_set;
public:
ScopedVMInitArgs() {
_args.version = JNI_VERSION_1_2;
_args.nOptions = 0;
_args.options = NULL;
_args.ignoreUnrecognized = false;
_is_set = false;
}
// Populates the JavaVMInitArgs object represented by this
// ScopedVMInitArgs object with the arguments in options. The
// allocated memory is deleted by the destructor. If this method
// returns anything other than JNI_OK, then this object is in a
// partially constructed state, and should be abandoned.
jint set_args(GrowableArray<JavaVMOption>* options) {
_is_set = true;
JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
JavaVMOption, options->length(), mtInternal);
if (options_arr == NULL) {
return JNI_ENOMEM;
}
_args.options = options_arr;
for (int i = 0; i < options->length(); i++) {
options_arr[i] = options->at(i);
options_arr[i].optionString = os::strdup(options_arr[i].optionString);
if (options_arr[i].optionString == NULL) {
// Rely on the destructor to do cleanup.
_args.nOptions = i;
return JNI_ENOMEM;
}
}
_args.nOptions = options->length();
_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
return JNI_OK;
}
JavaVMInitArgs* get() { return &_args; }
bool is_set() { return _is_set; }
~ScopedVMInitArgs() {
if (_args.options == NULL) return;
for (int i = 0; i < _args.nOptions; i++) {
os::free(_args.options[i].optionString);
}
FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
}
// Insert options into this option list, to replace option at
// vm_options_file_pos (-XX:VMOptionsFile)
jint insert(const JavaVMInitArgs* args,
const JavaVMInitArgs* args_to_insert,
const int vm_options_file_pos) {
assert(_args.options == NULL, "shouldn't be set yet");
assert(args_to_insert->nOptions != 0, "there should be args to insert");
assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
int length = args->nOptions + args_to_insert->nOptions - 1;
GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
GrowableArray<JavaVMOption>(length, true); // Construct new option array
for (int i = 0; i < args->nOptions; i++) {
if (i == vm_options_file_pos) {
// insert the new options starting at the same place as the
// -XX:VMOptionsFile option
for (int j = 0; j < args_to_insert->nOptions; j++) {
options->push(args_to_insert->options[j]);
}
} else {
options->push(args->options[i]);
}
}
// make into options array
jint result = set_args(options);
delete options;
return result;
}
};
jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
return parse_options_environment_variable("_JAVA_OPTIONS", args);
}
jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
}
jint Arguments::parse_options_environment_variable(const char* name,
ScopedVMInitArgs* vm_args) {
char *buffer = ::getenv(name);
// Don't check this environment variable if user has special privileges
// (e.g. unix su command).
if (buffer == NULL || os::have_special_privileges()) {
return JNI_OK;
}
if ((buffer = os::strdup(buffer)) == NULL) {
return JNI_ENOMEM;
}
int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
os::free(buffer);
return retcode;
}
jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
// read file into buffer
int fd = ::open(file_name, O_RDONLY);
if (fd < 0) {
jio_fprintf(defaultStream::error_stream(),
"Could not open options file '%s'\n",
file_name);
return JNI_ERR;
}
struct stat stbuf;
int retcode = os::stat(file_name, &stbuf);
if (retcode != 0) {
jio_fprintf(defaultStream::error_stream(),
"Could not stat options file '%s'\n",
file_name);
os::close(fd);
return JNI_ERR;
}
if (stbuf.st_size == 0) {
// tell caller there is no option data and that is ok
os::close(fd);
return JNI_OK;
}
// '+ 1' for NULL termination even with max bytes
size_t bytes_alloc = stbuf.st_size + 1;
char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
if (NULL == buf) {
jio_fprintf(defaultStream::error_stream(),
"Could not allocate read buffer for options file parse\n");
os::close(fd);
return JNI_ENOMEM;
}
memset(buf, 0, bytes_alloc);
// Fill buffer
// Use ::read() instead of os::read because os::read()
// might do a thread state transition
// and it is too early for that here
ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
os::close(fd);
if (bytes_read < 0) {
FREE_C_HEAP_ARRAY(char, buf);
jio_fprintf(defaultStream::error_stream(),
"Could not read options file '%s'\n", file_name);
return JNI_ERR;
}
if (bytes_read == 0) {
// tell caller there is no option data and that is ok
FREE_C_HEAP_ARRAY(char, buf);
return JNI_OK;
}
retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
FREE_C_HEAP_ARRAY(char, buf);
return retcode;
}
jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
// some pointers to help with parsing
char *buffer_end = buffer + buf_len;
char *opt_hd = buffer;
char *wrt = buffer;
char *rd = buffer;
// parse all options
while (rd < buffer_end) {
// skip leading white space from the input string
while (rd < buffer_end && isspace(*rd)) {
rd++;
}
if (rd >= buffer_end) {
break;
}
// Remember this is where we found the head of the token.
opt_hd = wrt;
// Tokens are strings of non white space characters separated
// by one or more white spaces.
while (rd < buffer_end && !isspace(*rd)) {
if (*rd == '\'' || *rd == '"') { // handle a quoted string
int quote = *rd; // matching quote to look for
rd++; // don't copy open quote
while (rd < buffer_end && *rd != quote) {
// include everything (even spaces)
// up until the close quote
*wrt++ = *rd++; // copy to option string
}
if (rd < buffer_end) {
rd++; // don't copy close quote
} else {
// did not see closing quote
jio_fprintf(defaultStream::error_stream(),
"Unmatched quote in %s\n", name);
delete options;
return JNI_ERR;
}
} else {
*wrt++ = *rd++; // copy to option string
}
}
// steal a white space character and set it to NULL
*wrt++ = '\0';
// We now have a complete token
JavaVMOption option;
option.optionString = opt_hd;
option.extraInfo = NULL;
options->append(option); // Fill in option
rd++; // Advance to next character
}
// Fill out JavaVMInitArgs structure.
jint status = vm_args->set_args(options);
delete options;
return status;
}
void Arguments::set_shared_spaces_flags() {
if (DumpSharedSpaces) {
if (RequireSharedSpaces) {
warning("Cannot dump shared archive while using shared archive");
}
UseSharedSpaces = false;
#ifdef _LP64
if (!UseCompressedOops || !UseCompressedClassPointers) {
vm_exit_during_initialization(
"Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
}
} else {
if (!UseCompressedOops || !UseCompressedClassPointers) {
no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
}
#endif
}
}
#if !INCLUDE_ALL_GCS
static void force_serial_gc() {
FLAG_SET_DEFAULT(UseSerialGC, true);
UNSUPPORTED_GC_OPTION(UseG1GC);
UNSUPPORTED_GC_OPTION(UseParallelGC);
UNSUPPORTED_GC_OPTION(UseParallelOldGC);
UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
UNSUPPORTED_GC_OPTION(UseParNewGC);
}
#endif // INCLUDE_ALL_GCS
// Sharing support
// Construct the path to the archive
static char* get_shared_archive_path() {
char *shared_archive_path;
if (SharedArchiveFile == NULL) {
char jvm_path[JVM_MAXPATHLEN];
os::jvm_path(jvm_path, sizeof(jvm_path));
char *end = strrchr(jvm_path, *os::file_separator());
if (end != NULL) *end = '\0';
size_t jvm_path_len = strlen(jvm_path);
size_t file_sep_len = strlen(os::file_separator());
const size_t len = jvm_path_len + file_sep_len + 20;
shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
if (shared_archive_path != NULL) {
jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
jvm_path, os::file_separator());
}
} else {
shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
}
return shared_archive_path;
}
#ifndef PRODUCT
// Determine whether LogVMOutput should be implicitly turned on.
static bool use_vm_log() {
if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
PrintAssembly || TraceDeoptimization || TraceDependencies ||
(VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
return true;
}
#ifdef COMPILER1
if (PrintC1Statistics) {
return true;
}
#endif // COMPILER1
#ifdef COMPILER2
if (PrintOptoAssembly || PrintOptoStatistics) {
return true;
}
#endif // COMPILER2
return false;
}
#endif // PRODUCT
jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
char** flags_file,
char** vm_options_file,
const int vm_options_file_pos,
ScopedVMInitArgs *vm_options_file_args,
ScopedVMInitArgs* args_out) {
jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args);
if (code != JNI_OK) {
return code;
}
if (vm_options_file_args->get()->nOptions < 1) {
return JNI_OK;
}
return args_out->insert(args, vm_options_file_args->get(),
vm_options_file_pos);
}
jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
char ** flags_file,
char ** vm_options_file,
ScopedVMInitArgs* vm_options_file_args,
ScopedVMInitArgs* args_out) {
// Remaining part of option string
const char* tail;
int vm_options_file_pos = -1;
for (int index = 0; index < args->nOptions; index++) {
const JavaVMOption* option = args->options + index;
if (ArgumentsExt::process_options(option)) {
continue;
}
if (match_option(option, "-XX:Flags=", &tail)) {
*flags_file = (char *) tail;
if (*flags_file == NULL) {
jio_fprintf(defaultStream::error_stream(),
"Cannot copy flags_file name.\n");
return JNI_ENOMEM;
}
continue;
}
if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
if (vm_options_file != NULL) {
// The caller accepts -XX:VMOptionsFile
if (*vm_options_file != NULL) {
jio_fprintf(defaultStream::error_stream(),
"The VM Options file can only be specified once and "
"only on the command line.\n");
return JNI_EINVAL;
}
*vm_options_file = (char *) tail;
vm_options_file_pos = index; // save position of -XX:VMOptionsFile
// If there's a VMOptionsFile, parse that (also can set flags_file)
jint code = insert_vm_options_file(args, flags_file, vm_options_file,
vm_options_file_pos,
vm_options_file_args, args_out);
if (code != JNI_OK) {
return code;
}
if (args_out->is_set()) {
// The VMOptions file inserted some options so switch 'args'
// to the new set of options, and continue processing which
// preserves "last option wins" semantics.
args = args_out->get();
// The first option from the VMOptionsFile replaces the
// current option. So we back track to process the
// replacement option.
index--;
}
} else {
jio_fprintf(defaultStream::error_stream(),
"VM options file is only supported on the command line\n");
return JNI_EINVAL;
}
continue;
}
if (match_option(option, "-XX:+PrintVMOptions")) {
PrintVMOptions = true;
continue;
}
if (match_option(option, "-XX:-PrintVMOptions")) {
PrintVMOptions = false;
continue;
}
if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
IgnoreUnrecognizedVMOptions = true;
continue;
}
if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
IgnoreUnrecognizedVMOptions = false;
continue;
}
if (match_option(option, "-XX:+PrintFlagsInitial")) {
CommandLineFlags::printFlags(tty, false);
vm_exit(0);
}
if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
#if INCLUDE_NMT
// The launcher did not setup nmt environment variable properly.
if (!MemTracker::check_launcher_nmt_support(tail)) {
warning("Native Memory Tracking did not setup properly, using wrong launcher?");
}
// Verify if nmt option is valid.
if (MemTracker::verify_nmt_option()) {
// Late initialization, still in single-threaded mode.
if (MemTracker::tracking_level() >= NMT_summary) {
MemTracker::init();
}
} else {
vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
}
continue;
#else
jio_fprintf(defaultStream::error_stream(),
"Native Memory Tracking is not supported in this VM\n");
return JNI_ERR;
#endif
}
#ifndef PRODUCT
if (match_option(option, "-XX:+PrintFlagsWithComments")) {
CommandLineFlags::printFlags(tty, true);
vm_exit(0);
}
#endif
}
return JNI_OK;
}
static void print_options(const JavaVMInitArgs *args) {
const char* tail;
for (int index = 0; index < args->nOptions; index++) {
const JavaVMOption *option = args->options + index;
if (match_option(option, "-XX:", &tail)) {
logOption(tail);
}
}
}
// Parse entry point called from JNI_CreateJavaVM
jint Arguments::parse(const JavaVMInitArgs* args) {
assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
// Initialize ranges and constraints
CommandLineFlagRangeList::init();
CommandLineFlagConstraintList::init();
// If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
const char* hotspotrc = ".hotspotrc";
char* flags_file = NULL;
char* vm_options_file = NULL;
bool settings_file_specified = false;
bool needs_hotspotrc_warning = false;
ScopedVMInitArgs java_tool_options_args;
ScopedVMInitArgs java_options_args;
ScopedVMInitArgs modified_cmd_line_args;
// Pass in vm_options_file_args to keep memory for flags_file from being
// deallocated if found in the vm options file.
ScopedVMInitArgs vm_options_file_args;
jint code =
parse_java_tool_options_environment_variable(&java_tool_options_args);
if (code != JNI_OK) {
return code;
}
code = parse_java_options_environment_variable(&java_options_args);
if (code != JNI_OK) {
return code;
}
code = match_special_option_and_act(java_tool_options_args.get(),
&flags_file, NULL, NULL, NULL);
if (code != JNI_OK) {
return code;
}
code = match_special_option_and_act(args, &flags_file, &vm_options_file,
&vm_options_file_args,
&modified_cmd_line_args);
if (code != JNI_OK) {
return code;
}
// The command line arguments have been modified to include VMOptionsFile arguments.
if (modified_cmd_line_args.is_set()) {
args = modified_cmd_line_args.get();
}
code = match_special_option_and_act(java_options_args.get(), &flags_file,
NULL, NULL, NULL);
if (code != JNI_OK) {
return code;
}
settings_file_specified = (flags_file != NULL);
if (IgnoreUnrecognizedVMOptions) {
// uncast const to modify the flag args->ignoreUnrecognized
*(jboolean*)(&args->ignoreUnrecognized) = true;
java_tool_options_args.get()->ignoreUnrecognized = true;
java_options_args.get()->ignoreUnrecognized = true;
}
// Parse specified settings file
if (settings_file_specified) {
if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
return JNI_EINVAL;
}
} else {
#ifdef ASSERT
// Parse default .hotspotrc settings file
if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
return JNI_EINVAL;
}
#else
struct stat buf;
if (os::stat(hotspotrc, &buf) == 0) {
needs_hotspotrc_warning = true;
}
#endif
}
if (PrintVMOptions) {
print_options(java_tool_options_args.get());
print_options(args);
print_options(java_options_args.get());
}
// Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
jint result = parse_vm_init_args(java_tool_options_args.get(),
java_options_args.get(),
args); // command line arguments
if (result != JNI_OK) {
return result;
}
// Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
SharedArchivePath = get_shared_archive_path();
if (SharedArchivePath == NULL) {
return JNI_ENOMEM;
}
// Set up VerifySharedSpaces
if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
VerifySharedSpaces = true;
}
// Delay warning until here so that we've had a chance to process
// the -XX:-PrintWarnings flag
if (needs_hotspotrc_warning) {
warning("%s file is present but has been ignored. "
"Run with -XX:Flags=%s to load the file.",
hotspotrc, hotspotrc);
}
#if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
#endif
ArgumentsExt::report_unsupported_options();
#ifndef PRODUCT
if (TraceBytecodesAt != 0) {
TraceBytecodes = true;
}
if (CountCompiledCalls) {
if (UseCounterDecay) {
warning("UseCounterDecay disabled because CountCalls is set");
UseCounterDecay = false;
}
}
#endif // PRODUCT
if (ScavengeRootsInCode == 0) {
if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
warning("Forcing ScavengeRootsInCode non-zero");
}
ScavengeRootsInCode = 1;
}
if (PrintGCDetails) {
// Turn on -verbose:gc options as well
PrintGC = true;
}
// Set object alignment values.
set_object_alignment();
#if !INCLUDE_ALL_GCS
force_serial_gc();
#endif // INCLUDE_ALL_GCS
#if !INCLUDE_CDS
if (DumpSharedSpaces || RequireSharedSpaces) {
jio_fprintf(defaultStream::error_stream(),
"Shared spaces are not supported in this VM\n");
return JNI_ERR;
}
if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
warning("Shared spaces are not supported in this VM");
FLAG_SET_DEFAULT(UseSharedSpaces, false);
FLAG_SET_DEFAULT(PrintSharedSpaces, false);
}
no_shared_spaces("CDS Disabled");
#endif // INCLUDE_CDS
return JNI_OK;
}
jint Arguments::apply_ergo() {
// Set flags based on ergonomics.
set_ergonomics_flags();
set_shared_spaces_flags();
// Check the GC selections again.
if (!check_gc_consistency()) {
return JNI_EINVAL;
}
if (TieredCompilation) {
set_tiered_flags();
} else {
int max_compilation_policy_choice = 1;
#ifdef COMPILER2
max_compilation_policy_choice = 2;
#endif
// Check if the policy is valid.
if (CompilationPolicyChoice >= max_compilation_policy_choice) {
vm_exit_during_initialization(
"Incompatible compilation policy selected", NULL);
}
// Scale CompileThreshold
// CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
}
}
#ifdef COMPILER2
#ifndef PRODUCT
if (PrintIdealGraphLevel > 0) {
FLAG_SET_ERGO(bool, PrintIdealGraph, true);
}
#endif
#endif
// Set heap size based on available physical memory
set_heap_size();
ArgumentsExt::set_gc_specific_flags();
// Initialize Metaspace flags and alignments
Metaspace::ergo_initialize();
// Set bytecode rewriting flags
set_bytecode_flags();
// Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
jint code = set_aggressive_opts_flags();
if (code != JNI_OK) {
return code;
}
// Turn off biased locking for locking debug mode flags,
// which are subtly different from each other but neither works with
// biased locking
if (UseHeavyMonitors
#ifdef COMPILER1
|| !UseFastLocking
#endif // COMPILER1
#if INCLUDE_JVMCI
|| !JVMCIUseFastLocking
#endif
) {
if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
// flag set to true on command line; warn the user that they
// can't enable biased locking here
warning("Biased Locking is not supported with locking debug flags"
"; ignoring UseBiasedLocking flag." );
}
UseBiasedLocking = false;
}
#ifdef ZERO
// Clear flags not supported on zero.
FLAG_SET_DEFAULT(ProfileInterpreter, false);
FLAG_SET_DEFAULT(UseBiasedLocking, false);
LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
#endif // CC_INTERP
#ifdef COMPILER2
if (!EliminateLocks) {
EliminateNestedLocks = false;
}
if (!Inline) {
IncrementalInline = false;
}
#ifndef PRODUCT
if (!IncrementalInline) {
AlwaysIncrementalInline = false;
}
#endif
if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
// nothing to use the profiling, turn if off
FLAG_SET_DEFAULT(TypeProfileLevel, 0);
}
#endif
if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
DebugNonSafepoints = true;
}
if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
}
#ifndef PRODUCT
if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
if (use_vm_log()) {
LogVMOutput = true;
}
}
#endif // PRODUCT
if (PrintCommandLineFlags) {
CommandLineFlags::printSetFlags(tty);
}
// Apply CPU specific policy for the BiasedLocking
if (UseBiasedLocking) {
if (!VM_Version::use_biased_locking() &&
!(FLAG_IS_CMDLINE(UseBiasedLocking))) {
UseBiasedLocking = false;
}
}
#ifdef COMPILER2
if (!UseBiasedLocking || EmitSync != 0) {
UseOptoBiasInlining = false;
}
#endif
return JNI_OK;
}
jint Arguments::adjust_after_os() {
if (UseNUMA) {
if (UseParallelGC || UseParallelOldGC) {
if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
}
}
// UseNUMAInterleaving is set to ON for all collectors and
// platforms when UseNUMA is set to ON. NUMA-aware collectors
// such as the parallel collector for Linux and Solaris will
// interleave old gen and survivor spaces on top of NUMA
// allocation policy for the eden space.
// Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
// all platforms and ParallelGC on Windows will interleave all
// of the heap spaces across NUMA nodes.
if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
}
}
return JNI_OK;
}
int Arguments::PropertyList_count(SystemProperty* pl) {
int count = 0;
while(pl != NULL) {
count++;
pl = pl->next();
}
return count;
}
const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
assert(key != NULL, "just checking");
SystemProperty* prop;
for (prop = pl; prop != NULL; prop = prop->next()) {
if (strcmp(key, prop->key()) == 0) return prop->value();
}
return NULL;
}
const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
int count = 0;
const char* ret_val = NULL;
while(pl != NULL) {
if(count >= index) {
ret_val = pl->key();
break;
}
count++;
pl = pl->next();
}
return ret_val;
}
char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
int count = 0;
char* ret_val = NULL;
while(pl != NULL) {
if(count >= index) {
ret_val = pl->value();
break;
}
count++;
pl = pl->next();
}
return ret_val;
}
void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
SystemProperty* p = *plist;
if (p == NULL) {
*plist = new_p;
} else {
while (p->next() != NULL) {
p = p->next();
}
p->set_next(new_p);
}
}
void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
if (plist == NULL)
return;
SystemProperty* new_p = new SystemProperty(k, v, true);
PropertyList_add(plist, new_p);
}
void Arguments::PropertyList_add(SystemProperty *element) {
PropertyList_add(&_system_properties, element);
}
// This add maintains unique property key in the list.
void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
if (plist == NULL)
return;
// If property key exist then update with new value.
SystemProperty* prop;
for (prop = *plist; prop != NULL; prop = prop->next()) {
if (strcmp(k, prop->key()) == 0) {
if (append) {
prop->append_value(v);
} else {
prop->set_value(v);
}
return;
}
}
PropertyList_add(plist, k, v);
}
// Copies src into buf, replacing "%%" with "%" and "%p" with pid
// Returns true if all of the source pointed by src has been copied over to
// the destination buffer pointed by buf. Otherwise, returns false.
// Notes:
// 1. If the length (buflen) of the destination buffer excluding the
// NULL terminator character is not long enough for holding the expanded
// pid characters, it also returns false instead of returning the partially
// expanded one.
// 2. The passed in "buflen" should be large enough to hold the null terminator.
bool Arguments::copy_expand_pid(const char* src, size_t srclen,
char* buf, size_t buflen) {
const char* p = src;
char* b = buf;
const char* src_end = &src[srclen];
char* buf_end = &buf[buflen - 1];
while (p < src_end && b < buf_end) {
if (*p == '%') {
switch (*(++p)) {
case '%': // "%%" ==> "%"
*b++ = *p++;
break;
case 'p': { // "%p" ==> current process id
// buf_end points to the character before the last character so
// that we could write '\0' to the end of the buffer.
size_t buf_sz = buf_end - b + 1;
int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
// if jio_snprintf fails or the buffer is not long enough to hold
// the expanded pid, returns false.
if (ret < 0 || ret >= (int)buf_sz) {
return false;
} else {
b += ret;
assert(*b == '\0', "fail in copy_expand_pid");
if (p == src_end && b == buf_end + 1) {
// reach the end of the buffer.
return true;
}
}
p++;
break;
}
default :
*b++ = '%';
}
} else {
*b++ = *p++;
}
}
*b = '\0';
return (p == src_end); // return false if not all of the source was copied
}