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/*
* Copyright (c) 1997, 2022, 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 "cds/cds_globals.hpp"
#include "cds/dynamicArchive.hpp"
#include "classfile/classLoaderDataGraph.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/stringTable.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "code/codeCache.hpp"
#include "compiler/compileBroker.hpp"
#include "compiler/compilerOracle.hpp"
#include "gc/shared/collectedHeap.hpp"
#include "gc/shared/stringdedup/stringDedup.hpp"
#include "interpreter/bytecodeHistogram.hpp"
#include "jfr/jfrEvents.hpp"
#include "jfr/support/jfrThreadId.hpp"
#include "jvm.h"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/metaspaceUtils.hpp"
#include "memory/oopFactory.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/constantPool.hpp"
#include "oops/generateOopMap.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/instanceOop.hpp"
#include "oops/klassVtable.hpp"
#include "oops/method.hpp"
#include "oops/objArrayOop.hpp"
#include "oops/oop.inline.hpp"
#include "oops/symbol.hpp"
#include "prims/jvmtiExport.hpp"
#include "runtime/continuation.hpp"
#include "runtime/deoptimization.hpp"
#include "runtime/flags/flagSetting.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/init.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/javaThread.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/statSampler.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/task.hpp"
#include "runtime/threads.hpp"
#include "runtime/timer.hpp"
#include "runtime/vmOperations.hpp"
#include "runtime/vmThread.hpp"
#include "runtime/vm_version.hpp"
#include "services/memTracker.hpp"
#include "utilities/dtrace.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"
#include "utilities/vmError.hpp"
#ifdef COMPILER1
#include "c1/c1_Compiler.hpp"
#include "c1/c1_Runtime1.hpp"
#endif
#ifdef COMPILER2
#include "code/compiledIC.hpp"
#include "opto/compile.hpp"
#include "opto/indexSet.hpp"
#include "opto/runtime.hpp"
#endif
#if INCLUDE_JFR
#include "jfr/jfr.hpp"
#endif
#if INCLUDE_JVMCI
#include "jvmci/jvmci.hpp"
#endif
GrowableArray<Method*>* collected_profiled_methods;
int compare_methods(Method** a, Method** b) {
// compiled_invocation_count() returns int64_t, forcing the entire expression
// to be evaluated as int64_t. Overflow is not an issue.
int64_t diff = (((*b)->invocation_count() + (*b)->compiled_invocation_count())
- ((*a)->invocation_count() + (*a)->compiled_invocation_count()));
return (diff < 0) ? -1 : (diff > 0) ? 1 : 0;
}
void collect_profiled_methods(Method* m) {
Thread* thread = Thread::current();
methodHandle mh(thread, m);
if ((m->method_data() != NULL) &&
(PrintMethodData || CompilerOracle::should_print(mh))) {
collected_profiled_methods->push(m);
}
}
void print_method_profiling_data() {
if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
(PrintMethodData || CompilerOracle::should_print_methods())) {
ResourceMark rm;
collected_profiled_methods = new GrowableArray<Method*>(1024);
SystemDictionary::methods_do(collect_profiled_methods);
collected_profiled_methods->sort(&compare_methods);
int count = collected_profiled_methods->length();
int total_size = 0;
if (count > 0) {
for (int index = 0; index < count; index++) {
Method* m = collected_profiled_methods->at(index);
ttyLocker ttyl;
tty->print_cr("------------------------------------------------------------------------");
m->print_invocation_count();
tty->print_cr(" mdo size: %d bytes", m->method_data()->size_in_bytes());
tty->cr();
// Dump data on parameters if any
if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
tty->fill_to(2);
m->method_data()->parameters_type_data()->print_data_on(tty);
}
m->print_codes();
total_size += m->method_data()->size_in_bytes();
}
tty->print_cr("------------------------------------------------------------------------");
tty->print_cr("Total MDO size: %d bytes", total_size);
}
}
}
#ifndef PRODUCT
// Statistics printing (method invocation histogram)
GrowableArray<Method*>* collected_invoked_methods;
void collect_invoked_methods(Method* m) {
if (m->invocation_count() + m->compiled_invocation_count() >= 1) {
collected_invoked_methods->push(m);
}
}
// Invocation count accumulators should be unsigned long to shift the
// overflow border. Longer-running workloads tend to create invocation
// counts which already overflow 32-bit counters for individual methods.
void print_method_invocation_histogram() {
ResourceMark rm;
collected_invoked_methods = new GrowableArray<Method*>(1024);
SystemDictionary::methods_do(collect_invoked_methods);
collected_invoked_methods->sort(&compare_methods);
//
tty->cr();
tty->print_cr("Histogram Over Method Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff);
tty->cr();
tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
uint64_t total = 0,
int_total = 0,
comp_total = 0,
special_total= 0,
static_total = 0,
final_total = 0,
synch_total = 0,
native_total = 0,
access_total = 0;
for (int index = 0; index < collected_invoked_methods->length(); index++) {
// Counter values returned from getter methods are signed int.
// To shift the overflow border by a factor of two, we interpret
// them here as unsigned long. A counter can't be negative anyway.
Method* m = collected_invoked_methods->at(index);
uint64_t iic = (uint64_t)m->invocation_count();
uint64_t cic = (uint64_t)m->compiled_invocation_count();
if ((iic + cic) >= (uint64_t)MethodHistogramCutoff) m->print_invocation_count();
int_total += iic;
comp_total += cic;
if (m->is_final()) final_total += iic + cic;
if (m->is_static()) static_total += iic + cic;
if (m->is_synchronized()) synch_total += iic + cic;
if (m->is_native()) native_total += iic + cic;
if (m->is_accessor()) access_total += iic + cic;
}
tty->cr();
total = int_total + comp_total;
special_total = final_total + static_total +synch_total + native_total + access_total;
tty->print_cr("Invocations summary for %d methods:", collected_invoked_methods->length());
tty->print_cr("\t" UINT64_FORMAT_W(12) " (100%%) total", total);
tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- interpreted", int_total, 100.0 * int_total / total);
tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- compiled", comp_total, 100.0 * comp_total / total);
tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- special methods (interpreted and compiled)",
special_total, 100.0 * special_total/ total);
tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- synchronized",synch_total, 100.0 * synch_total / total);
tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- final", final_total, 100.0 * final_total / total);
tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- static", static_total, 100.0 * static_total / total);
tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- native", native_total, 100.0 * native_total / total);
tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- accessor", access_total, 100.0 * access_total / total);
tty->cr();
SharedRuntime::print_call_statistics(comp_total);
}
void print_bytecode_count() {
if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
}
}
// General statistics printing (profiling ...)
void print_statistics() {
if (CITime) {
CompileBroker::print_times();
}
#ifdef COMPILER1
if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
Runtime1::print_statistics();
SharedRuntime::print_statistics();
}
#endif /* COMPILER1 */
#ifdef COMPILER2
if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
Compile::print_statistics();
Deoptimization::print_statistics();
#ifndef COMPILER1
SharedRuntime::print_statistics();
#endif //COMPILER1
}
if (PrintLockStatistics || PrintPreciseRTMLockingStatistics) {
OptoRuntime::print_named_counters();
}
#ifdef ASSERT
if (CollectIndexSetStatistics) {
IndexSet::print_statistics();
}
#endif // ASSERT
#else // COMPILER2
#if INCLUDE_JVMCI
#ifndef COMPILER1
if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) {
FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization);
Deoptimization::print_statistics();
SharedRuntime::print_statistics();
}
#endif // COMPILER1
#endif // INCLUDE_JVMCI
#endif // COMPILER2
if (PrintNMethodStatistics) {
nmethod::print_statistics();
}
if (CountCompiledCalls) {
print_method_invocation_histogram();
}
print_method_profiling_data();
if (TimeOopMap) {
GenerateOopMap::print_time();
}
if (PrintSymbolTableSizeHistogram) {
SymbolTable::print_histogram();
}
if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
BytecodeCounter::print();
}
if (PrintBytecodePairHistogram) {
BytecodePairHistogram::print();
}
if (PrintCodeCache) {
MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
CodeCache::print();
}
// CodeHeap State Analytics.
if (PrintCodeHeapAnalytics) {
CompileBroker::print_heapinfo(NULL, "all", 4096); // details
}
if (PrintCodeCache2) {
MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
CodeCache::print_internals();
}
if (VerifyOops && Verbose) {
tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
}
print_bytecode_count();
if (PrintSystemDictionaryAtExit) {
ResourceMark rm;
MutexLocker mcld(ClassLoaderDataGraph_lock);
SystemDictionary::print();
}
if (PrintClassLoaderDataGraphAtExit) {
ResourceMark rm;
MutexLocker mcld(ClassLoaderDataGraph_lock);
ClassLoaderDataGraph::print();
}
// Native memory tracking data
if (PrintNMTStatistics) {
MemTracker::final_report(tty);
}
if (PrintMetaspaceStatisticsAtExit) {
MetaspaceUtils::print_basic_report(tty, 0);
}
ThreadsSMRSupport::log_statistics();
}
#else // PRODUCT MODE STATISTICS
void print_statistics() {
if (PrintMethodData) {
print_method_profiling_data();
}
if (CITime) {
CompileBroker::print_times();
}
#ifdef COMPILER2_OR_JVMCI
if ((LogVMOutput || LogCompilation) && UseCompiler) {
// Only print the statistics to the log file
FlagSetting fs(DisplayVMOutput, false);
Deoptimization::print_statistics();
}
#endif /* COMPILER2 || INCLUDE_JVMCI */
if (PrintCodeCache) {
MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
CodeCache::print();
}
// CodeHeap State Analytics.
if (PrintCodeHeapAnalytics) {
CompileBroker::print_heapinfo(NULL, "all", 4096); // details
}
#ifdef COMPILER2
if (PrintPreciseRTMLockingStatistics) {
OptoRuntime::print_named_counters();
}
#endif
// Native memory tracking data
if (PrintNMTStatistics) {
MemTracker::final_report(tty);
}
if (PrintMetaspaceStatisticsAtExit) {
MetaspaceUtils::print_basic_report(tty, 0);
}
ThreadsSMRSupport::log_statistics();
}
#endif
// Note: before_exit() can be executed only once, if more than one threads
// are trying to shutdown the VM at the same time, only one thread
// can run before_exit() and all other threads must wait.
void before_exit(JavaThread* thread, bool halt) {
#define BEFORE_EXIT_NOT_RUN 0
#define BEFORE_EXIT_RUNNING 1
#define BEFORE_EXIT_DONE 2
static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
// Note: don't use a Mutex to guard the entire before_exit(), as
// JVMTI post_thread_end_event and post_vm_death_event will run native code.
// A CAS or OSMutex would work just fine but then we need to manipulate
// thread state for Safepoint. Here we use Monitor wait() and notify_all()
// for synchronization.
{ MonitorLocker ml(BeforeExit_lock);
switch (_before_exit_status) {
case BEFORE_EXIT_NOT_RUN:
_before_exit_status = BEFORE_EXIT_RUNNING;
break;
case BEFORE_EXIT_RUNNING:
while (_before_exit_status == BEFORE_EXIT_RUNNING) {
ml.wait();
}
assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
return;
case BEFORE_EXIT_DONE:
// need block to avoid SS compiler bug
{
return;
}
}
}
#if INCLUDE_JVMCI
if (EnableJVMCI) {
JVMCI::shutdown(thread);
}
#endif
// Hang forever on exit if we're reporting an error.
if (ShowMessageBoxOnError && VMError::is_error_reported()) {
os::infinite_sleep();
}
EventThreadEnd event;
if (event.should_commit()) {
event.set_thread(JFR_JVM_THREAD_ID(thread));
event.commit();
}
JFR_ONLY(Jfr::on_vm_shutdown(false, halt);)
// Stop the WatcherThread. We do this before disenrolling various
// PeriodicTasks to reduce the likelihood of races.
if (PeriodicTask::num_tasks() > 0) {
WatcherThread::stop();
}
// shut down the StatSampler task
StatSampler::disengage();
StatSampler::destroy();
// Shut down string deduplication if running.
if (StringDedup::is_enabled()) {
StringDedup::stop();
}
// Stop concurrent GC threads
Universe::heap()->stop();
// Print GC/heap related information.
Log(gc, heap, exit) log;
if (log.is_info()) {
ResourceMark rm;
LogStream ls_info(log.info());
Universe::print_on(&ls_info);
if (log.is_trace()) {
LogStream ls_trace(log.trace());
MutexLocker mcld(ClassLoaderDataGraph_lock);
ClassLoaderDataGraph::print_on(&ls_trace);
}
}
if (PrintBytecodeHistogram) {
BytecodeHistogram::print();
}
#ifdef LINUX
if (DumpPerfMapAtExit) {
CodeCache::write_perf_map();
}
#endif
if (JvmtiExport::should_post_thread_life()) {
JvmtiExport::post_thread_end(thread);
}
// Always call even when there are not JVMTI environments yet, since environments
// may be attached late and JVMTI must track phases of VM execution
JvmtiExport::post_vm_death();
Threads::shutdown_vm_agents();
// Terminate the signal thread
// Note: we don't wait until it actually dies.
os::terminate_signal_thread();
#if INCLUDE_CDS
if (DynamicArchive::should_dump_at_vm_exit()) {
assert(ArchiveClassesAtExit != NULL, "Must be already set");
ExceptionMark em(thread);
DynamicArchive::dump(ArchiveClassesAtExit, thread);
if (thread->has_pending_exception()) {
ResourceMark rm(thread);
oop pending_exception = thread->pending_exception();
log_error(cds)("ArchiveClassesAtExit has failed %s: %s", pending_exception->klass()->external_name(),
java_lang_String::as_utf8_string(java_lang_Throwable::message(pending_exception)));
thread->clear_pending_exception();
}
}
#endif
print_statistics();
Universe::heap()->print_tracing_info();
{ MutexLocker ml(BeforeExit_lock);
_before_exit_status = BEFORE_EXIT_DONE;
BeforeExit_lock->notify_all();
}
if (VerifyStringTableAtExit) {
size_t fail_cnt = StringTable::verify_and_compare_entries();
if (fail_cnt != 0) {
tty->print_cr("ERROR: fail_cnt=" SIZE_FORMAT, fail_cnt);
guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
}
}
#undef BEFORE_EXIT_NOT_RUN
#undef BEFORE_EXIT_RUNNING
#undef BEFORE_EXIT_DONE
}
void vm_exit(int code) {
Thread* thread =
ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL;
if (thread == NULL) {
// very early initialization failure -- just exit
vm_direct_exit(code);
}
// We'd like to add an entry to the XML log to show that the VM is
// terminating, but we can't safely do that here. The logic to make
// XML termination logging safe is tied to the termination of the
// VMThread, and it doesn't terminate on this exit path. See 8222534.
if (VMThread::vm_thread() != NULL) {
if (thread->is_Java_thread()) {
// We must be "in_vm" for the code below to work correctly.
// Historically there must have been some exit path for which
// that was not the case and so we set it explicitly - even
// though we no longer know what that path may be.
JavaThread::cast(thread)->set_thread_state(_thread_in_vm);
}
// Fire off a VM_Exit operation to bring VM to a safepoint and exit
VM_Exit op(code);
// 4945125 The vm thread comes to a safepoint during exit.
// GC vm_operations can get caught at the safepoint, and the
// heap is unparseable if they are caught. Grab the Heap_lock
// to prevent this. The GC vm_operations will not be able to
// queue until after we release it, but we never do that as we
// are terminating the VM process.
MutexLocker ml(Heap_lock);
VMThread::execute(&op);
// should never reach here; but in case something wrong with VM Thread.
vm_direct_exit(code);
} else {
// VM thread is gone, just exit
vm_direct_exit(code);
}
ShouldNotReachHere();
}
void notify_vm_shutdown() {
// For now, just a dtrace probe.
HOTSPOT_VM_SHUTDOWN();
}
void vm_direct_exit(int code) {
notify_vm_shutdown();
os::wait_for_keypress_at_exit();
os::exit(code);
}
void vm_direct_exit(int code, const char* message) {
if (message != nullptr) {
tty->print_cr("%s", message);
}
vm_direct_exit(code);
}
void vm_perform_shutdown_actions() {
if (is_init_completed()) {
Thread* thread = Thread::current_or_null();
if (thread != NULL && thread->is_Java_thread()) {
// We are leaving the VM, set state to native (in case any OS exit
// handlers call back to the VM)
JavaThread* jt = JavaThread::cast(thread);
// Must always be walkable or have no last_Java_frame when in
// thread_in_native
jt->frame_anchor()->make_walkable();
jt->set_thread_state(_thread_in_native);
}
}
notify_vm_shutdown();
}
void vm_shutdown()
{
vm_perform_shutdown_actions();
os::wait_for_keypress_at_exit();
os::shutdown();
}
void vm_abort(bool dump_core) {
vm_perform_shutdown_actions();
os::wait_for_keypress_at_exit();
// Flush stdout and stderr before abort.
fflush(stdout);
fflush(stderr);
os::abort(dump_core);
ShouldNotReachHere();
}
void vm_notify_during_cds_dumping(const char* error, const char* message) {
if (error != NULL) {
tty->print_cr("Error occurred during CDS dumping");
tty->print("%s", error);
if (message != NULL) {
tty->print_cr(": %s", message);
}
else {
tty->cr();
}
}
}
void vm_exit_during_cds_dumping(const char* error, const char* message) {
vm_notify_during_cds_dumping(error, message);
// Failure during CDS dumping, we don't want to dump core
vm_abort(false);
}
void vm_notify_during_shutdown(const char* error, const char* message) {
if (error != NULL) {
tty->print_cr("Error occurred during initialization of VM");
tty->print("%s", error);
if (message != NULL) {
tty->print_cr(": %s", message);
}
else {
tty->cr();
}
}
if (ShowMessageBoxOnError && WizardMode) {
fatal("Error occurred during initialization of VM");
}
}
void vm_exit_during_initialization() {
vm_notify_during_shutdown(NULL, NULL);
// Failure during initialization, we don't want to dump core
vm_abort(false);
}
void vm_exit_during_initialization(Handle exception) {
tty->print_cr("Error occurred during initialization of VM");
// If there are exceptions on this thread it must be cleared
// first and here. Any future calls to EXCEPTION_MARK requires
// that no pending exceptions exist.
JavaThread* THREAD = JavaThread::current(); // can't be NULL
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
}
java_lang_Throwable::print_stack_trace(exception, tty);
tty->cr();
vm_notify_during_shutdown(NULL, NULL);
// Failure during initialization, we don't want to dump core
vm_abort(false);
}
void vm_exit_during_initialization(Symbol* ex, const char* message) {
ResourceMark rm;
vm_notify_during_shutdown(ex->as_C_string(), message);
// Failure during initialization, we don't want to dump core
vm_abort(false);
}
void vm_exit_during_initialization(const char* error, const char* message) {
vm_notify_during_shutdown(error, message);
// Failure during initialization, we don't want to dump core
vm_abort(false);
}
void vm_shutdown_during_initialization(const char* error, const char* message) {
vm_notify_during_shutdown(error, message);
vm_shutdown();
}
JDK_Version JDK_Version::_current;
const char* JDK_Version::_java_version;
const char* JDK_Version::_runtime_name;
const char* JDK_Version::_runtime_version;
const char* JDK_Version::_runtime_vendor_version;
const char* JDK_Version::_runtime_vendor_vm_bug_url;
void JDK_Version::initialize() {
assert(!_current.is_valid(), "Don't initialize twice");
int major = VM_Version::vm_major_version();
int minor = VM_Version::vm_minor_version();
int security = VM_Version::vm_security_version();
int build = VM_Version::vm_build_number();
int patch = VM_Version::vm_patch_version();
_current = JDK_Version(major, minor, security, patch, build);
}
void JDK_Version_init() {
JDK_Version::initialize();
}
static int64_t encode_jdk_version(const JDK_Version& v) {
return
((int64_t)v.major_version() << (BitsPerByte * 4)) |
((int64_t)v.minor_version() << (BitsPerByte * 3)) |
((int64_t)v.security_version() << (BitsPerByte * 2)) |
((int64_t)v.patch_version() << (BitsPerByte * 1)) |
((int64_t)v.build_number() << (BitsPerByte * 0));
}
int JDK_Version::compare(const JDK_Version& other) const {
assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
uint64_t e = encode_jdk_version(*this);
uint64_t o = encode_jdk_version(other);
return (e > o) ? 1 : ((e == o) ? 0 : -1);
}
/* See JEP 223 */
void JDK_Version::to_string(char* buffer, size_t buflen) const {
assert(buffer && buflen > 0, "call with useful buffer");
size_t index = 0;
if (!is_valid()) {
jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
} else {
int rc = jio_snprintf(
&buffer[index], buflen - index, "%d.%d", _major, _minor);
if (rc == -1) return;
index += rc;
if (_patch > 0) {
rc = jio_snprintf(&buffer[index], buflen - index, ".%d.%d", _security, _patch);
if (rc == -1) return;
index += rc;
} else if (_security > 0) {
rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security);
if (rc == -1) return;
index += rc;
}
if (_build > 0) {
rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build);
if (rc == -1) return;
index += rc;
}
}
}
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