8233913: Remove implicit conversion from Method* to methodHandle
Summary: Fix call sites to use existing THREAD local or pass down THREAD local for shallower callsites. Make linkResolver methods return Method* for caller to handleize if needed.
Reviewed-by: iklam, thartmann, hseigel
/*
* Copyright (c) 1997, 2019, 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 "jvm.h"
#include "classfile/classFileStream.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/classLoaderData.inline.hpp"
#include "classfile/javaAssertions.hpp"
#include "classfile/javaClasses.inline.hpp"
#include "classfile/moduleEntry.hpp"
#include "classfile/modules.hpp"
#include "classfile/packageEntry.hpp"
#include "classfile/stringTable.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/vmSymbols.hpp"
#include "gc/shared/collectedHeap.inline.hpp"
#include "interpreter/bytecode.hpp"
#include "interpreter/bytecodeUtils.hpp"
#include "jfr/jfrEvents.hpp"
#include "logging/log.hpp"
#include "memory/heapShared.hpp"
#include "memory/oopFactory.hpp"
#include "memory/referenceType.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/access.inline.hpp"
#include "oops/constantPool.hpp"
#include "oops/fieldStreams.inline.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/method.hpp"
#include "oops/objArrayKlass.hpp"
#include "oops/objArrayOop.inline.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvm_misc.hpp"
#include "prims/jvmtiExport.hpp"
#include "prims/jvmtiThreadState.hpp"
#include "prims/nativeLookup.hpp"
#include "prims/stackwalk.hpp"
#include "runtime/arguments.hpp"
#include "runtime/atomic.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/init.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/deoptimization.hpp"
#include "runtime/handshake.hpp"
#include "runtime/java.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/jfieldIDWorkaround.hpp"
#include "runtime/jniHandles.inline.hpp"
#include "runtime/orderAccess.hpp"
#include "runtime/os.inline.hpp"
#include "runtime/perfData.hpp"
#include "runtime/reflection.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/threadSMR.hpp"
#include "runtime/vframe.inline.hpp"
#include "runtime/vmOperations.hpp"
#include "runtime/vm_version.hpp"
#include "services/attachListener.hpp"
#include "services/management.hpp"
#include "services/threadService.hpp"
#include "utilities/copy.hpp"
#include "utilities/defaultStream.hpp"
#include "utilities/dtrace.hpp"
#include "utilities/events.hpp"
#include "utilities/histogram.hpp"
#include "utilities/macros.hpp"
#include "utilities/utf8.hpp"
#if INCLUDE_CDS
#include "classfile/systemDictionaryShared.hpp"
#endif
#include <errno.h>
/*
NOTE about use of any ctor or function call that can trigger a safepoint/GC:
such ctors and calls MUST NOT come between an oop declaration/init and its
usage because if objects are move this may cause various memory stomps, bus
errors and segfaults. Here is a cookbook for causing so called "naked oop
failures":
JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
JVMWrapper("JVM_GetClassDeclaredFields");
// Object address to be held directly in mirror & not visible to GC
oop mirror = JNIHandles::resolve_non_null(ofClass);
// If this ctor can hit a safepoint, moving objects around, then
ComplexConstructor foo;
// Boom! mirror may point to JUNK instead of the intended object
(some dereference of mirror)
// Here's another call that may block for GC, making mirror stale
MutexLocker ml(some_lock);
// And here's an initializer that can result in a stale oop
// all in one step.
oop o = call_that_can_throw_exception(TRAPS);
The solution is to keep the oop declaration BELOW the ctor or function
call that might cause a GC, do another resolve to reassign the oop, or
consider use of a Handle instead of an oop so there is immunity from object
motion. But note that the "QUICK" entries below do not have a handlemark
and thus can only support use of handles passed in.
*/
static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
ResourceMark rm;
int line_number = -1;
const char * source_file = NULL;
const char * trace = "explicit";
InstanceKlass* caller = NULL;
JavaThread* jthread = JavaThread::current();
if (jthread->has_last_Java_frame()) {
vframeStream vfst(jthread);
// scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
Method* last_caller = NULL;
while (!vfst.at_end()) {
Method* m = vfst.method();
if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
!vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
!vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
break;
}
last_caller = m;
vfst.next();
}
// if this is called from Class.forName0 and that is called from Class.forName,
// then print the caller of Class.forName. If this is Class.loadClass, then print
// that caller, otherwise keep quiet since this should be picked up elsewhere.
bool found_it = false;
if (!vfst.at_end() &&
vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
vfst.method()->name() == vmSymbols::forName0_name()) {
vfst.next();
if (!vfst.at_end() &&
vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
vfst.method()->name() == vmSymbols::forName_name()) {
vfst.next();
found_it = true;
}
} else if (last_caller != NULL &&
last_caller->method_holder()->name() ==
vmSymbols::java_lang_ClassLoader() &&
last_caller->name() == vmSymbols::loadClass_name()) {
found_it = true;
} else if (!vfst.at_end()) {
if (vfst.method()->is_native()) {
// JNI call
found_it = true;
}
}
if (found_it && !vfst.at_end()) {
// found the caller
caller = vfst.method()->method_holder();
line_number = vfst.method()->line_number_from_bci(vfst.bci());
if (line_number == -1) {
// show method name if it's a native method
trace = vfst.method()->name_and_sig_as_C_string();
}
Symbol* s = caller->source_file_name();
if (s != NULL) {
source_file = s->as_C_string();
}
}
}
if (caller != NULL) {
if (to_class != caller) {
const char * from = caller->external_name();
const char * to = to_class->external_name();
// print in a single call to reduce interleaving between threads
if (source_file != NULL) {
log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
} else {
log_debug(class, resolve)("%s %s (%s)", from, to, trace);
}
}
}
}
void trace_class_resolution(Klass* to_class) {
EXCEPTION_MARK;
trace_class_resolution_impl(to_class, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
}
}
// Wrapper to trace JVM functions
#ifdef ASSERT
Histogram* JVMHistogram;
volatile int JVMHistogram_lock = 0;
class JVMHistogramElement : public HistogramElement {
public:
JVMHistogramElement(const char* name);
};
JVMHistogramElement::JVMHistogramElement(const char* elementName) {
_name = elementName;
uintx count = 0;
while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
count +=1;
if ( (WarnOnStalledSpinLock > 0)
&& (count % WarnOnStalledSpinLock == 0)) {
warning("JVMHistogram_lock seems to be stalled");
}
}
}
if(JVMHistogram == NULL)
JVMHistogram = new Histogram("JVM Call Counts",100);
JVMHistogram->add_element(this);
Atomic::dec(&JVMHistogram_lock);
}
#define JVMCountWrapper(arg) \
static JVMHistogramElement* e = new JVMHistogramElement(arg); \
if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
#define JVMWrapper(arg) JVMCountWrapper(arg);
#else
#define JVMWrapper(arg)
#endif
// Interface version /////////////////////////////////////////////////////////////////////
JVM_LEAF(jint, JVM_GetInterfaceVersion())
return JVM_INTERFACE_VERSION;
JVM_END
// java.lang.System //////////////////////////////////////////////////////////////////////
JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
JVMWrapper("JVM_CurrentTimeMillis");
return os::javaTimeMillis();
JVM_END
JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
JVMWrapper("JVM_NanoTime");
return os::javaTimeNanos();
JVM_END
// The function below is actually exposed by jdk.internal.misc.VM and not
// java.lang.System, but we choose to keep it here so that it stays next
// to JVM_CurrentTimeMillis and JVM_NanoTime
const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
JVMWrapper("JVM_GetNanoTimeAdjustment");
jlong seconds;
jlong nanos;
os::javaTimeSystemUTC(seconds, nanos);
// We're going to verify that the result can fit in a long.
// For that we need the difference in seconds between 'seconds'
// and 'offset_secs' to be such that:
// |seconds - offset_secs| < (2^63/10^9)
// We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
// which makes |seconds - offset_secs| < 2^33
// and we will prefer +/- 2^32 as the maximum acceptable diff
// as 2^32 has a more natural feel than 2^33...
//
// So if |seconds - offset_secs| >= 2^32 - we return a special
// sentinel value (-1) which the caller should take as an
// exception value indicating that the offset given to us is
// too far from range of the current time - leading to too big
// a nano adjustment. The caller is expected to recover by
// computing a more accurate offset and calling this method
// again. (For the record 2^32 secs is ~136 years, so that
// should rarely happen)
//
jlong diff = seconds - offset_secs;
if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
return -1; // sentinel value: the offset is too far off the target
}
// return the adjustment. If you compute a time by adding
// this number of nanoseconds along with the number of seconds
// in the offset you should get the current UTC time.
return (diff * (jlong)1000000000) + nanos;
JVM_END
JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
jobject dst, jint dst_pos, jint length))
JVMWrapper("JVM_ArrayCopy");
// Check if we have null pointers
if (src == NULL || dst == NULL) {
THROW(vmSymbols::java_lang_NullPointerException());
}
arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
// Do copy
s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
JVM_END
static void set_property(Handle props, const char* key, const char* value, TRAPS) {
JavaValue r(T_OBJECT);
// public synchronized Object put(Object key, Object value);
HandleMark hm(THREAD);
Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
JavaCalls::call_virtual(&r,
props,
SystemDictionary::Properties_klass(),
vmSymbols::put_name(),
vmSymbols::object_object_object_signature(),
key_str,
value_str,
THREAD);
}
#define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
/*
* Return all of the system properties in a Java String array with alternating
* names and values from the jvm SystemProperty.
* Which includes some internal and all commandline -D defined properties.
*/
JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
JVMWrapper("JVM_GetProperties");
ResourceMark rm(THREAD);
HandleMark hm(THREAD);
int ndx = 0;
int fixedCount = 2;
SystemProperty* p = Arguments::system_properties();
int count = Arguments::PropertyList_count(p);
// Allocate result String array
InstanceKlass* ik = SystemDictionary::String_klass();
objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
objArrayHandle result_h(THREAD, r);
while (p != NULL) {
const char * key = p->key();
if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
const char * value = p->value();
Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
result_h->obj_at_put(ndx * 2, key_str());
result_h->obj_at_put(ndx * 2 + 1, value_str());
ndx++;
}
p = p->next();
}
// Convert the -XX:MaxDirectMemorySize= command line flag
// to the sun.nio.MaxDirectMemorySize property.
// Do this after setting user properties to prevent people
// from setting the value with a -D option, as requested.
// Leave empty if not supplied
if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
char as_chars[256];
jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
result_h->obj_at_put(ndx * 2, key_str());
result_h->obj_at_put(ndx * 2 + 1, value_str());
ndx++;
}
// JVM monitoring and management support
// Add the sun.management.compiler property for the compiler's name
{
#undef CSIZE
#if defined(_LP64) || defined(_WIN64)
#define CSIZE "64-Bit "
#else
#define CSIZE
#endif // 64bit
#ifdef TIERED
const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
#else
#if defined(COMPILER1)
const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
#elif defined(COMPILER2)
const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
#elif INCLUDE_JVMCI
#error "INCLUDE_JVMCI should imply TIERED"
#else
const char* compiler_name = "";
#endif // compilers
#endif // TIERED
if (*compiler_name != '\0' &&
(Arguments::mode() != Arguments::_int)) {
Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
result_h->obj_at_put(ndx * 2, key_str());
result_h->obj_at_put(ndx * 2 + 1, value_str());
ndx++;
}
}
return (jobjectArray) JNIHandles::make_local(env, result_h());
JVM_END
/*
* Return the temporary directory that the VM uses for the attach
* and perf data files.
*
* It is important that this directory is well-known and the
* same for all VM instances. It cannot be affected by configuration
* variables such as java.io.tmpdir.
*/
JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
JVMWrapper("JVM_GetTemporaryDirectory");
HandleMark hm(THREAD);
const char* temp_dir = os::get_temp_directory();
Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
return (jstring) JNIHandles::make_local(env, h());
JVM_END
// java.lang.Runtime /////////////////////////////////////////////////////////////////////////
extern volatile jint vm_created;
JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
JVMWrapper("JVM_BeforeHalt");
EventShutdown event;
if (event.should_commit()) {
event.set_reason("Shutdown requested from Java");
event.commit();
}
JVM_END
JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
before_exit(thread);
vm_exit(code);
JVM_END
JVM_ENTRY_NO_ENV(void, JVM_GC(void))
JVMWrapper("JVM_GC");
if (!DisableExplicitGC) {
Universe::heap()->collect(GCCause::_java_lang_system_gc);
}
JVM_END
JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
JVMWrapper("JVM_MaxObjectInspectionAge");
return Universe::heap()->millis_since_last_gc();
JVM_END
static inline jlong convert_size_t_to_jlong(size_t val) {
// In the 64-bit vm, a size_t can overflow a jlong (which is signed).
NOT_LP64 (return (jlong)val;)
LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
}
JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
JVMWrapper("JVM_TotalMemory");
size_t n = Universe::heap()->capacity();
return convert_size_t_to_jlong(n);
JVM_END
JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
JVMWrapper("JVM_FreeMemory");
size_t n = Universe::heap()->unused();
return convert_size_t_to_jlong(n);
JVM_END
JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
JVMWrapper("JVM_MaxMemory");
size_t n = Universe::heap()->max_capacity();
return convert_size_t_to_jlong(n);
JVM_END
JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
JVMWrapper("JVM_ActiveProcessorCount");
return os::active_processor_count();
JVM_END
// java.lang.Throwable //////////////////////////////////////////////////////
JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
JVMWrapper("JVM_FillInStackTrace");
Handle exception(thread, JNIHandles::resolve_non_null(receiver));
java_lang_Throwable::fill_in_stack_trace(exception);
JVM_END
// java.lang.NullPointerException ///////////////////////////////////////////
JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
if (!ShowCodeDetailsInExceptionMessages) return NULL;
oop exc = JNIHandles::resolve_non_null(throwable);
Method* method;
int bci;
if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
return NULL;
}
if (method->is_native()) {
return NULL;
}
stringStream ss;
bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
if (ok) {
oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_0);
return (jstring) JNIHandles::make_local(env, result);
} else {
return NULL;
}
JVM_END
// java.lang.StackTraceElement //////////////////////////////////////////////
JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
JVMWrapper("JVM_InitStackTraceElementArray");
Handle exception(THREAD, JNIHandles::resolve(throwable));
objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
objArrayHandle stack_trace(THREAD, st);
// Fill in the allocated stack trace
java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
JVM_END
JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
JVMWrapper("JVM_InitStackTraceElement");
Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
JVM_END
// java.lang.StackWalker //////////////////////////////////////////////////////
JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
jint skip_frames, jint frame_count, jint start_index,
jobjectArray frames))
JVMWrapper("JVM_CallStackWalk");
JavaThread* jt = (JavaThread*) THREAD;
if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
}
Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
// frames array is a Class<?>[] array when only getting caller reference,
// and a StackFrameInfo[] array (or derivative) otherwise. It should never
// be null.
objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
objArrayHandle frames_array_h(THREAD, fa);
int limit = start_index + frame_count;
if (frames_array_h->length() < limit) {
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
}
oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
start_index, frames_array_h, CHECK_NULL);
return JNIHandles::make_local(env, result);
JVM_END
JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
jint frame_count, jint start_index,
jobjectArray frames))
JVMWrapper("JVM_MoreStackWalk");
JavaThread* jt = (JavaThread*) THREAD;
// frames array is a Class<?>[] array when only getting caller reference,
// and a StackFrameInfo[] array (or derivative) otherwise. It should never
// be null.
objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
objArrayHandle frames_array_h(THREAD, fa);
int limit = start_index+frame_count;
if (frames_array_h->length() < limit) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
}
Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
start_index, frames_array_h, THREAD);
JVM_END
// java.lang.Object ///////////////////////////////////////////////
JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
JVMWrapper("JVM_IHashCode");
// as implemented in the classic virtual machine; return 0 if object is NULL
return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
JVM_END
JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
JVMWrapper("JVM_MonitorWait");
Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
JavaThreadInObjectWaitState jtiows(thread, ms != 0);
if (JvmtiExport::should_post_monitor_wait()) {
JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
// The current thread already owns the monitor and it has not yet
// been added to the wait queue so the current thread cannot be
// made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
// event handler cannot accidentally consume an unpark() meant for
// the ParkEvent associated with this ObjectMonitor.
}
ObjectSynchronizer::wait(obj, ms, CHECK);
JVM_END
JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
JVMWrapper("JVM_MonitorNotify");
Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
ObjectSynchronizer::notify(obj, CHECK);
JVM_END
JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
JVMWrapper("JVM_MonitorNotifyAll");
Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
ObjectSynchronizer::notifyall(obj, CHECK);
JVM_END
JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
JVMWrapper("JVM_Clone");
Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
Klass* klass = obj->klass();
JvmtiVMObjectAllocEventCollector oam;
#ifdef ASSERT
// Just checking that the cloneable flag is set correct
if (obj->is_array()) {
guarantee(klass->is_cloneable(), "all arrays are cloneable");
} else {
guarantee(obj->is_instance(), "should be instanceOop");
bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
}
#endif
// Check if class of obj supports the Cloneable interface.
// All arrays are considered to be cloneable (See JLS 20.1.5).
// All j.l.r.Reference classes are considered non-cloneable.
if (!klass->is_cloneable() ||
(klass->is_instance_klass() &&
InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
ResourceMark rm(THREAD);
THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
}
// Make shallow object copy
const int size = obj->size();
oop new_obj_oop = NULL;
if (obj->is_array()) {
const int length = ((arrayOop)obj())->length();
new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
/* do_zero */ true, CHECK_NULL);
} else {
new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
}
HeapAccess<>::clone(obj(), new_obj_oop, size);
Handle new_obj(THREAD, new_obj_oop);
// Caution: this involves a java upcall, so the clone should be
// "gc-robust" by this stage.
if (klass->has_finalizer()) {
assert(obj->is_instance(), "should be instanceOop");
new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
new_obj = Handle(THREAD, new_obj_oop);
}
return JNIHandles::make_local(env, new_obj());
JVM_END
// java.io.File ///////////////////////////////////////////////////////////////
JVM_LEAF(char*, JVM_NativePath(char* path))
JVMWrapper("JVM_NativePath");
return os::native_path(path);
JVM_END
// Misc. class handling ///////////////////////////////////////////////////////////
JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
JVMWrapper("JVM_GetCallerClass");
// Getting the class of the caller frame.
//
// The call stack at this point looks something like this:
//
// [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
// [1] [ @CallerSensitive API.method ]
// [.] [ (skipped intermediate frames) ]
// [n] [ caller ]
vframeStream vfst(thread);
// Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
Method* m = vfst.method();
assert(m != NULL, "sanity");
switch (n) {
case 0:
// This must only be called from Reflection.getCallerClass
if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
}
// fall-through
case 1:
// Frame 0 and 1 must be caller sensitive.
if (!m->caller_sensitive()) {
THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
}
break;
default:
if (!m->is_ignored_by_security_stack_walk()) {
// We have reached the desired frame; return the holder class.
return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
}
break;
}
}
return NULL;
JVM_END
JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
JVMWrapper("JVM_FindPrimitiveClass");
oop mirror = NULL;
BasicType t = name2type(utf);
if (t != T_ILLEGAL && !is_reference_type(t)) {
mirror = Universe::java_mirror(t);
}
if (mirror == NULL) {
THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
} else {
return (jclass) JNIHandles::make_local(env, mirror);
}
JVM_END
// Returns a class loaded by the bootstrap class loader; or null
// if not found. ClassNotFoundException is not thrown.
// FindClassFromBootLoader is exported to the launcher for windows.
JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
const char* name))
JVMWrapper("JVM_FindClassFromBootLoader");
// Java libraries should ensure that name is never null...
if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
// It's impossible to create this class; the name cannot fit
// into the constant pool.
return NULL;
}
TempNewSymbol h_name = SymbolTable::new_symbol(name);
Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
if (k == NULL) {
return NULL;
}
if (log_is_enabled(Debug, class, resolve)) {
trace_class_resolution(k);
}
return (jclass) JNIHandles::make_local(env, k->java_mirror());
JVM_END
// Find a class with this name in this loader, using the caller's protection domain.
JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
jboolean init, jobject loader,
jclass caller))
JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
// Java libraries should ensure that name is never null...
if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
// It's impossible to create this class; the name cannot fit
// into the constant pool.
THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
}
TempNewSymbol h_name = SymbolTable::new_symbol(name);
oop loader_oop = JNIHandles::resolve(loader);
oop from_class = JNIHandles::resolve(caller);
oop protection_domain = NULL;
// If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
// NPE. Put it in another way, the bootstrap class loader has all permission and
// thus no checkPackageAccess equivalence in the VM class loader.
// The caller is also passed as NULL by the java code if there is no security
// manager to avoid the performance cost of getting the calling class.
if (from_class != NULL && loader_oop != NULL) {
protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
}
Handle h_loader(THREAD, loader_oop);
Handle h_prot(THREAD, protection_domain);
jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
h_prot, false, THREAD);
if (log_is_enabled(Debug, class, resolve) && result != NULL) {
trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
}
return result;
JVM_END
// Currently only called from the old verifier.
JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
jboolean init, jclass from))
JVMWrapper("JVM_FindClassFromClass");
if (name == NULL) {
THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
}
if ((int)strlen(name) > Symbol::max_length()) {
// It's impossible to create this class; the name cannot fit
// into the constant pool.
Exceptions::fthrow(THREAD_AND_LOCATION,
vmSymbols::java_lang_NoClassDefFoundError(),
"Class name exceeds maximum length of %d: %s",
Symbol::max_length(),
name);
return 0;
}
TempNewSymbol h_name = SymbolTable::new_symbol(name);
oop from_class_oop = JNIHandles::resolve(from);
Klass* from_class = (from_class_oop == NULL)
? (Klass*)NULL
: java_lang_Class::as_Klass(from_class_oop);
oop class_loader = NULL;
oop protection_domain = NULL;
if (from_class != NULL) {
class_loader = from_class->class_loader();
protection_domain = from_class->protection_domain();
}
Handle h_loader(THREAD, class_loader);
Handle h_prot (THREAD, protection_domain);
jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
h_prot, true, thread);
if (log_is_enabled(Debug, class, resolve) && result != NULL) {
// this function is generally only used for class loading during verification.
ResourceMark rm;
oop from_mirror = JNIHandles::resolve_non_null(from);
Klass* from_class = java_lang_Class::as_Klass(from_mirror);
const char * from_name = from_class->external_name();
oop mirror = JNIHandles::resolve_non_null(result);
Klass* to_class = java_lang_Class::as_Klass(mirror);
const char * to = to_class->external_name();
log_debug(class, resolve)("%s %s (verification)", from_name, to);
}
return result;
JVM_END
static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
if (loader.is_null()) {
return;
}
// check whether the current caller thread holds the lock or not.
// If not, increment the corresponding counter
if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
ObjectSynchronizer::owner_self) {
counter->inc();
}
}
// common code for JVM_DefineClass() and JVM_DefineClassWithSource()
static jclass jvm_define_class_common(JNIEnv *env, const char *name,
jobject loader, const jbyte *buf,
jsize len, jobject pd, const char *source,
TRAPS) {
if (source == NULL) source = "__JVM_DefineClass__";
assert(THREAD->is_Java_thread(), "must be a JavaThread");
JavaThread* jt = (JavaThread*) THREAD;
PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
ClassLoader::perf_define_appclass_selftime(),
ClassLoader::perf_define_appclasses(),
jt->get_thread_stat()->perf_recursion_counts_addr(),
jt->get_thread_stat()->perf_timers_addr(),
PerfClassTraceTime::DEFINE_CLASS);
if (UsePerfData) {
ClassLoader::perf_app_classfile_bytes_read()->inc(len);
}
// Since exceptions can be thrown, class initialization can take place
// if name is NULL no check for class name in .class stream has to be made.
TempNewSymbol class_name = NULL;
if (name != NULL) {
const int str_len = (int)strlen(name);
if (str_len > Symbol::max_length()) {
// It's impossible to create this class; the name cannot fit
// into the constant pool.
Exceptions::fthrow(THREAD_AND_LOCATION,
vmSymbols::java_lang_NoClassDefFoundError(),
"Class name exceeds maximum length of %d: %s",
Symbol::max_length(),
name);
return 0;
}
class_name = SymbolTable::new_symbol(name, str_len);
}
ResourceMark rm(THREAD);
ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
Handle class_loader (THREAD, JNIHandles::resolve(loader));
if (UsePerfData) {
is_lock_held_by_thread(class_loader,
ClassLoader::sync_JVMDefineClassLockFreeCounter(),
THREAD);
}
Handle protection_domain (THREAD, JNIHandles::resolve(pd));
Klass* k = SystemDictionary::resolve_from_stream(class_name,
class_loader,
protection_domain,
&st,
CHECK_NULL);
if (log_is_enabled(Debug, class, resolve) && k != NULL) {
trace_class_resolution(k);
}
return (jclass) JNIHandles::make_local(env, k->java_mirror());
}
JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
JVMWrapper("JVM_DefineClass");
return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
JVM_END
JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
JVMWrapper("JVM_DefineClassWithSource");
return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
JVM_END
JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
JVMWrapper("JVM_FindLoadedClass");
ResourceMark rm(THREAD);
Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
char* str = java_lang_String::as_utf8_string(h_name());
// Sanity check, don't expect null
if (str == NULL) return NULL;
// Internalize the string, converting '.' to '/' in string.
char* p = (char*)str;
while (*p != '\0') {
if (*p == '.') {
*p = '/';
}
p++;
}
const int str_len = (int)(p - str);
if (str_len > Symbol::max_length()) {
// It's impossible to create this class; the name cannot fit
// into the constant pool.
return NULL;
}
TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
// Security Note:
// The Java level wrapper will perform the necessary security check allowing
// us to pass the NULL as the initiating class loader.
Handle h_loader(THREAD, JNIHandles::resolve(loader));
if (UsePerfData) {
is_lock_held_by_thread(h_loader,
ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
THREAD);
}
Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
h_loader,
Handle(),
CHECK_NULL);
#if INCLUDE_CDS
if (k == NULL) {
// If the class is not already loaded, try to see if it's in the shared
// archive for the current classloader (h_loader).
k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
}
#endif
return (k == NULL) ? NULL :
(jclass) JNIHandles::make_local(env, k->java_mirror());
JVM_END
// Module support //////////////////////////////////////////////////////////////////////////////
JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
jstring location, const char* const* packages, jsize num_packages))
JVMWrapper("JVM_DefineModule");
Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
JVM_END
JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
JVMWrapper("JVM_SetBootLoaderUnnamedModule");
Modules::set_bootloader_unnamed_module(module, CHECK);
JVM_END
JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
JVMWrapper("JVM_AddModuleExports");
Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
JVM_END
JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
JVM_END
JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
JVMWrapper("JVM_AddModuleExportsToAll");
Modules::add_module_exports(from_module, package, NULL, CHECK);
JVM_END
JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
JVMWrapper("JVM_AddReadsModule");
Modules::add_reads_module(from_module, source_module, CHECK);
JVM_END
// Reflection support //////////////////////////////////////////////////////////////////////////////
JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
assert (cls != NULL, "illegal class");
JVMWrapper("JVM_InitClassName");
JvmtiVMObjectAllocEventCollector oam;
ResourceMark rm(THREAD);
HandleMark hm(THREAD);
Handle java_class(THREAD, JNIHandles::resolve(cls));
oop result = java_lang_Class::name(java_class, CHECK_NULL);
return (jstring) JNIHandles::make_local(env, result);
JVM_END
JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetClassInterfaces");
JvmtiVMObjectAllocEventCollector oam;
oop mirror = JNIHandles::resolve_non_null(cls);
// Special handling for primitive objects
if (java_lang_Class::is_primitive(mirror)) {
// Primitive objects does not have any interfaces
objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
return (jobjectArray) JNIHandles::make_local(env, r);
}
Klass* klass = java_lang_Class::as_Klass(mirror);
// Figure size of result array
int size;
if (klass->is_instance_klass()) {
size = InstanceKlass::cast(klass)->local_interfaces()->length();
} else {
assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
size = 2;
}
// Allocate result array
objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
objArrayHandle result (THREAD, r);
// Fill in result
if (klass->is_instance_klass()) {
// Regular instance klass, fill in all local interfaces
for (int index = 0; index < size; index++) {
Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
result->obj_at_put(index, k->java_mirror());
}
} else {
// All arrays implement java.lang.Cloneable and java.io.Serializable
result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
}
return (jobjectArray) JNIHandles::make_local(env, result());
JVM_END
JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
JVMWrapper("JVM_IsInterface");
oop mirror = JNIHandles::resolve_non_null(cls);
if (java_lang_Class::is_primitive(mirror)) {
return JNI_FALSE;
}
Klass* k = java_lang_Class::as_Klass(mirror);
jboolean result = k->is_interface();
assert(!result || k->is_instance_klass(),
"all interfaces are instance types");
// The compiler intrinsic for isInterface tests the
// Klass::_access_flags bits in the same way.
return result;
JVM_END
JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetClassSigners");
JvmtiVMObjectAllocEventCollector oam;
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
// There are no signers for primitive types
return NULL;
}
objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
// If there are no signers set in the class, or if the class
// is an array, return NULL.
if (signers == NULL) return NULL;
// copy of the signers array
Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
for (int index = 0; index < signers->length(); index++) {
signers_copy->obj_at_put(index, signers->obj_at(index));
}
// return the copy
return (jobjectArray) JNIHandles::make_local(env, signers_copy);
JVM_END
JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
JVMWrapper("JVM_SetClassSigners");
if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
// This call is ignored for primitive types and arrays.
// Signers are only set once, ClassLoader.java, and thus shouldn't
// be called with an array. Only the bootstrap loader creates arrays.
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
if (k->is_instance_klass()) {
java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
}
}
JVM_END
JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetProtectionDomain");
if (JNIHandles::resolve(cls) == NULL) {
THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
}
if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
// Primitive types does not have a protection domain.
return NULL;
}
oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
return (jobject) JNIHandles::make_local(env, pd);
JVM_END
// Returns the inherited_access_control_context field of the running thread.
JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetInheritedAccessControlContext");
oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
return JNIHandles::make_local(env, result);
JVM_END
class RegisterArrayForGC {
private:
JavaThread *_thread;
public:
RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
_thread = thread;
_thread->register_array_for_gc(array);
}
~RegisterArrayForGC() {
_thread->register_array_for_gc(NULL);
}
};
JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetStackAccessControlContext");
if (!UsePrivilegedStack) return NULL;
ResourceMark rm(THREAD);
GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
JvmtiVMObjectAllocEventCollector oam;
// count the protection domains on the execution stack. We collapse
// duplicate consecutive protection domains into a single one, as
// well as stopping when we hit a privileged frame.
oop previous_protection_domain = NULL;
Handle privileged_context(thread, NULL);
bool is_privileged = false;
oop protection_domain = NULL;
// Iterate through Java frames
vframeStream vfst(thread);
for(; !vfst.at_end(); vfst.next()) {
// get method of frame
Method* method = vfst.method();
// stop at the first privileged frame
if (method->method_holder() == SystemDictionary::AccessController_klass() &&
method->name() == vmSymbols::executePrivileged_name())
{
// this frame is privileged
is_privileged = true;
javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
StackValueCollection* locals = priv->locals();
StackValue* ctx_sv = locals->at(1); // AccessControlContext context
StackValue* clr_sv = locals->at(2); // Class<?> caller
assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
privileged_context = ctx_sv->get_obj();
Handle caller = clr_sv->get_obj();
Klass *caller_klass = java_lang_Class::as_Klass(caller());
protection_domain = caller_klass->protection_domain();
} else {
protection_domain = method->method_holder()->protection_domain();
}
if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
local_array->push(protection_domain);
previous_protection_domain = protection_domain;
}
if (is_privileged) break;
}
// either all the domains on the stack were system domains, or
// we had a privileged system domain
if (local_array->is_empty()) {
if (is_privileged && privileged_context.is_null()) return NULL;
oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
return JNIHandles::make_local(env, result);
}
// the resource area must be registered in case of a gc
RegisterArrayForGC ragc(thread, local_array);
objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
local_array->length(), CHECK_NULL);
objArrayHandle h_context(thread, context);
for (int index = 0; index < local_array->length(); index++) {
h_context->obj_at_put(index, local_array->at(index));
}
oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
return JNIHandles::make_local(env, result);
JVM_END
JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
JVMWrapper("JVM_IsArrayClass");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
return (k != NULL) && k->is_array_klass() ? true : false;
JVM_END
JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
JVMWrapper("JVM_IsPrimitiveClass");
oop mirror = JNIHandles::resolve_non_null(cls);
return (jboolean) java_lang_Class::is_primitive(mirror);
JVM_END
JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetClassModifiers");
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
// Primitive type
return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
}
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
return k->modifier_flags();
JVM_END
// Inner class reflection ///////////////////////////////////////////////////////////////////////////////
JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
JvmtiVMObjectAllocEventCollector oam;
// ofClass is a reference to a java_lang_Class object. The mirror object
// of an InstanceKlass
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
return (jobjectArray)JNIHandles::make_local(env, result);
}
InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
InnerClassesIterator iter(k);
if (iter.length() == 0) {
// Neither an inner nor outer class
oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
return (jobjectArray)JNIHandles::make_local(env, result);
}
// find inner class info
constantPoolHandle cp(thread, k->constants());
int length = iter.length();
// Allocate temp. result array
objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
objArrayHandle result (THREAD, r);
int members = 0;
for (; !iter.done(); iter.next()) {
int ioff = iter.inner_class_info_index();
int ooff = iter.outer_class_info_index();
if (ioff != 0 && ooff != 0) {
// Check to see if the name matches the class we're looking for
// before attempting to find the class.
if (cp->klass_name_at_matches(k, ooff)) {
Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
if (outer_klass == k) {
Klass* ik = cp->klass_at(ioff, CHECK_NULL);
InstanceKlass* inner_klass = InstanceKlass::cast(ik);
// Throws an exception if outer klass has not declared k as
// an inner klass
Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
result->obj_at_put(members, inner_klass->java_mirror());
members++;
}
}
}
}
if (members != length) {
// Return array of right length
objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
for(int i = 0; i < members; i++) {
res->obj_at_put(i, result->obj_at(i));
}
return (jobjectArray)JNIHandles::make_local(env, res);
}
return (jobjectArray)JNIHandles::make_local(env, result());
JVM_END
JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
{
// ofClass is a reference to a java_lang_Class object.
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
return NULL;
}
bool inner_is_member = false;
Klass* outer_klass
= InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
if (outer_klass == NULL) return NULL; // already a top-level class
if (!inner_is_member) return NULL; // an anonymous class (inside a method)
return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
}
JVM_END
JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
{
oop mirror = JNIHandles::resolve_non_null(cls);
if (java_lang_Class::is_primitive(mirror) ||
!java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
return NULL;
}
InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
int ooff = 0, noff = 0;
if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
if (noff != 0) {
constantPoolHandle i_cp(thread, k->constants());
Symbol* name = i_cp->symbol_at(noff);
Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
return (jstring) JNIHandles::make_local(env, str());
}
}
return NULL;
}
JVM_END
JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
assert (cls != NULL, "illegal class");
JVMWrapper("JVM_GetClassSignature");
JvmtiVMObjectAllocEventCollector oam;
ResourceMark rm(THREAD);
// Return null for arrays and primatives
if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
if (k->is_instance_klass()) {
Symbol* sym = InstanceKlass::cast(k)->generic_signature();
if (sym == NULL) return NULL;
Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
return (jstring) JNIHandles::make_local(env, str());
}
}
return NULL;
JVM_END
JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
assert (cls != NULL, "illegal class");
JVMWrapper("JVM_GetClassAnnotations");
// Return null for arrays and primitives
if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
if (k->is_instance_klass()) {
typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
return (jbyteArray) JNIHandles::make_local(env, a);
}
}
return NULL;
JVM_END
static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
// some of this code was adapted from from jni_FromReflectedField
oop reflected = JNIHandles::resolve_non_null(field);
oop mirror = java_lang_reflect_Field::clazz(reflected);
Klass* k = java_lang_Class::as_Klass(mirror);
int slot = java_lang_reflect_Field::slot(reflected);
int modifiers = java_lang_reflect_Field::modifiers(reflected);
InstanceKlass* ik = InstanceKlass::cast(k);
intptr_t offset = ik->field_offset(slot);
if (modifiers & JVM_ACC_STATIC) {
// for static fields we only look in the current class
if (!ik->find_local_field_from_offset(offset, true, &fd)) {
assert(false, "cannot find static field");
return false;
}
} else {
// for instance fields we start with the current class and work
// our way up through the superclass chain
if (!ik->find_field_from_offset(offset, false, &fd)) {
assert(false, "cannot find instance field");
return false;
}
}
return true;
}
static Method* jvm_get_method_common(jobject method) {
// some of this code was adapted from from jni_FromReflectedMethod
oop reflected = JNIHandles::resolve_non_null(method);
oop mirror = NULL;
int slot = 0;
if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
mirror = java_lang_reflect_Constructor::clazz(reflected);
slot = java_lang_reflect_Constructor::slot(reflected);
} else {
assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
"wrong type");
mirror = java_lang_reflect_Method::clazz(reflected);
slot = java_lang_reflect_Method::slot(reflected);
}
Klass* k = java_lang_Class::as_Klass(mirror);
Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
assert(m != NULL, "cannot find method");
return m; // caller has to deal with NULL in product mode
}
/* Type use annotations support (JDK 1.8) */
JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
assert (cls != NULL, "illegal class");
JVMWrapper("JVM_GetClassTypeAnnotations");
ResourceMark rm(THREAD);
// Return null for arrays and primitives
if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
if (k->is_instance_klass()) {
AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
if (type_annotations != NULL) {
typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
return (jbyteArray) JNIHandles::make_local(env, a);
}
}
}
return NULL;
JVM_END
JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
assert (method != NULL, "illegal method");
JVMWrapper("JVM_GetMethodTypeAnnotations");
// method is a handle to a java.lang.reflect.Method object
Method* m = jvm_get_method_common(method);
if (m == NULL) {
return NULL;
}
AnnotationArray* type_annotations = m->type_annotations();
if (type_annotations != NULL) {
typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
return (jbyteArray) JNIHandles::make_local(env, a);
}
return NULL;
JVM_END
JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
assert (field != NULL, "illegal field");
JVMWrapper("JVM_GetFieldTypeAnnotations");
fieldDescriptor fd;
bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
if (!gotFd) {
return NULL;
}
return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
JVM_END
static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
if (!cp->is_within_bounds(index)) {
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
}
}
JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
{
JVMWrapper("JVM_GetMethodParameters");
// method is a handle to a java.lang.reflect.Method object
Method* method_ptr = jvm_get_method_common(method);
methodHandle mh (THREAD, method_ptr);
Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
const int num_params = mh->method_parameters_length();
if (num_params < 0) {
// A -1 return value from method_parameters_length means there is no
// parameter data. Return null to indicate this to the reflection
// API.
assert(num_params == -1, "num_params should be -1 if it is less than zero");
return (jobjectArray)NULL;
} else {
// Otherwise, we return something up to reflection, even if it is
// a zero-length array. Why? Because in some cases this can
// trigger a MalformedParametersException.
// make sure all the symbols are properly formatted
for (int i = 0; i < num_params; i++) {
MethodParametersElement* params = mh->method_parameters_start();
int index = params[i].name_cp_index;
constantPoolHandle cp(THREAD, mh->constants());
bounds_check(cp, index, CHECK_NULL);
if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
"Wrong type at constant pool index");
}
}
objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
objArrayHandle result (THREAD, result_oop);
for (int i = 0; i < num_params; i++) {
MethodParametersElement* params = mh->method_parameters_start();
// For a 0 index, give a NULL symbol
Symbol* sym = 0 != params[i].name_cp_index ?
mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
int flags = params[i].flags;
oop param = Reflection::new_parameter(reflected_method, i, sym,
flags, CHECK_NULL);
result->obj_at_put(i, param);
}
return (jobjectArray)JNIHandles::make_local(env, result());
}
}
JVM_END
// New (JDK 1.4) reflection implementation /////////////////////////////////////
JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
{
JVMWrapper("JVM_GetClassDeclaredFields");
JvmtiVMObjectAllocEventCollector oam;
// Exclude primitive types and array types
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
// Return empty array
oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
return (jobjectArray) JNIHandles::make_local(env, res);
}
InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
constantPoolHandle cp(THREAD, k->constants());
// Ensure class is linked
k->link_class(CHECK_NULL);
// Allocate result
int num_fields;
if (publicOnly) {
num_fields = 0;
for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
if (fs.access_flags().is_public()) ++num_fields;
}
} else {
num_fields = k->java_fields_count();
}
objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
objArrayHandle result (THREAD, r);
int out_idx = 0;
fieldDescriptor fd;
for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
if (!publicOnly || fs.access_flags().is_public()) {
fd.reinitialize(k, fs.index());
oop field = Reflection::new_field(&fd, CHECK_NULL);
result->obj_at_put(out_idx, field);
++out_idx;
}
}
assert(out_idx == num_fields, "just checking");
return (jobjectArray) JNIHandles::make_local(env, result());
}
JVM_END
static bool select_method(const methodHandle& method, bool want_constructor) {
if (want_constructor) {
return (method->is_initializer() && !method->is_static());
} else {
return (!method->is_initializer() && !method->is_overpass());
}
}
static jobjectArray get_class_declared_methods_helper(
JNIEnv *env,
jclass ofClass, jboolean publicOnly,
bool want_constructor,
Klass* klass, TRAPS) {
JvmtiVMObjectAllocEventCollector oam;
// Exclude primitive types and array types
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
|| java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
// Return empty array
oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
return (jobjectArray) JNIHandles::make_local(env, res);
}
InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
// Ensure class is linked
k->link_class(CHECK_NULL);
Array<Method*>* methods = k->methods();
int methods_length = methods->length();
// Save original method_idnum in case of redefinition, which can change
// the idnum of obsolete methods. The new method will have the same idnum
// but if we refresh the methods array, the counts will be wrong.
ResourceMark rm(THREAD);
GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
int num_methods = 0;
for (int i = 0; i < methods_length; i++) {
methodHandle method(THREAD, methods->at(i));
if (select_method(method, want_constructor)) {
if (!publicOnly || method->is_public()) {
idnums->push(method->method_idnum());
++num_methods;
}
}
}
// Allocate result
objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
objArrayHandle result (THREAD, r);
// Now just put the methods that we selected above, but go by their idnum
// in case of redefinition. The methods can be redefined at any safepoint,
// so above when allocating the oop array and below when creating reflect
// objects.
for (int i = 0; i < num_methods; i++) {
methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
if (method.is_null()) {
// Method may have been deleted and seems this API can handle null
// Otherwise should probably put a method that throws NSME
result->obj_at_put(i, NULL);
} else {
oop m;
if (want_constructor) {
m = Reflection::new_constructor(method, CHECK_NULL);
} else {
m = Reflection::new_method(method, false, CHECK_NULL);
}
result->obj_at_put(i, m);
}
}
return (jobjectArray) JNIHandles::make_local(env, result());
}
JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
{
JVMWrapper("JVM_GetClassDeclaredMethods");
return get_class_declared_methods_helper(env, ofClass, publicOnly,
/*want_constructor*/ false,
SystemDictionary::reflect_Method_klass(), THREAD);
}
JVM_END
JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
{
JVMWrapper("JVM_GetClassDeclaredConstructors");
return get_class_declared_methods_helper(env, ofClass, publicOnly,
/*want_constructor*/ true,
SystemDictionary::reflect_Constructor_klass(), THREAD);
}
JVM_END
JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
{
JVMWrapper("JVM_GetClassAccessFlags");
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
// Primitive type
return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
}
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
}
JVM_END
JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
{
JVMWrapper("JVM_AreNestMates");
Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
assert(c->is_instance_klass(), "must be");
InstanceKlass* ck = InstanceKlass::cast(c);
Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
assert(m->is_instance_klass(), "must be");
InstanceKlass* mk = InstanceKlass::cast(m);
return ck->has_nestmate_access_to(mk, THREAD);
}
JVM_END
JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
{
// current is not a primitive or array class
JVMWrapper("JVM_GetNestHost");
Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
assert(c->is_instance_klass(), "must be");
InstanceKlass* ck = InstanceKlass::cast(c);
// Don't post exceptions if validation fails
InstanceKlass* host = ck->nest_host(NULL, THREAD);
return (jclass) (host == NULL ? NULL :
JNIHandles::make_local(THREAD, host->java_mirror()));
}
JVM_END
JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
{
// current is not a primitive or array class
JVMWrapper("JVM_GetNestMembers");
Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
assert(c->is_instance_klass(), "must be");
InstanceKlass* ck = InstanceKlass::cast(c);
// Get the nest host for this nest - throw ICCE if validation fails
Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
{
JvmtiVMObjectAllocEventCollector oam;
Array<u2>* members = host->nest_members();
int length = members == NULL ? 0 : members->length();
// nest host is first in the array so make it one bigger
objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
length + 1, CHECK_NULL);
objArrayHandle result (THREAD, r);
result->obj_at_put(0, host->java_mirror());
if (length != 0) {
int i;
for (i = 0; i < length; i++) {
int cp_index = members->at(i);
Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
if (k->is_instance_klass()) {
InstanceKlass* nest_host_k =
InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
if (nest_host_k == host) {
result->obj_at_put(i+1, k->java_mirror());
}
else {
// k's nest host is legal but it isn't our host so
// throw ICCE
ResourceMark rm(THREAD);
Exceptions::fthrow(THREAD_AND_LOCATION,
icce,
"Nest member %s in %s declares a different nest host of %s",
k->external_name(),
host->external_name(),
nest_host_k->external_name()
);
return NULL;
}
}
else {
// we have a bad nest member entry - throw ICCE
ResourceMark rm(THREAD);
Exceptions::fthrow(THREAD_AND_LOCATION,
icce,
"Class %s can not be a nest member of %s",
k->external_name(),
host->external_name()
);
return NULL;
}
}
}
else {
assert(host == ck, "must be singleton nest");
}
return (jobjectArray)JNIHandles::make_local(THREAD, result());
}
}
JVM_END
// Constant pool access //////////////////////////////////////////////////////////
JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
{
JVMWrapper("JVM_GetClassConstantPool");
JvmtiVMObjectAllocEventCollector oam;
// Return null for primitives and arrays
if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
if (k->is_instance_klass()) {
InstanceKlass* k_h = InstanceKlass::cast(k);
Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
reflect_ConstantPool::set_cp(jcp(), k_h->constants());
return JNIHandles::make_local(jcp());
}
}
return NULL;
}
JVM_END
JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
{
JVMWrapper("JVM_ConstantPoolGetSize");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
return cp->length();
}
JVM_END
JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetClassAt");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
constantTag tag = cp->tag_at(index);
if (!tag.is_klass() && !tag.is_unresolved_klass()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
Klass* k = cp->klass_at(index, CHECK_NULL);
return (jclass) JNIHandles::make_local(k->java_mirror());
}
JVM_END
JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
constantTag tag = cp->tag_at(index);
if (!tag.is_klass() && !tag.is_unresolved_klass()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
if (k == NULL) return NULL;
return (jclass) JNIHandles::make_local(k->java_mirror());
}
JVM_END
static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
constantTag tag = cp->tag_at(index);
if (!tag.is_method() && !tag.is_interface_method()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
int klass_ref = cp->uncached_klass_ref_index_at(index);
Klass* k_o;
if (force_resolution) {
k_o = cp->klass_at(klass_ref, CHECK_NULL);
} else {
k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
if (k_o == NULL) return NULL;
}
InstanceKlass* k = InstanceKlass::cast(k_o);
Symbol* name = cp->uncached_name_ref_at(index);
Symbol* sig = cp->uncached_signature_ref_at(index);
methodHandle m (THREAD, k->find_method(name, sig));
if (m.is_null()) {
THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
}
oop method;
if (!m->is_initializer() || m->is_static()) {
method = Reflection::new_method(m, true, CHECK_NULL);
} else {
method = Reflection::new_constructor(m, CHECK_NULL);
}
return JNIHandles::make_local(method);
}
JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetMethodAt");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
return res;
}
JVM_END
JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
return res;
}
JVM_END
static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
constantTag tag = cp->tag_at(index);
if (!tag.is_field()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
int klass_ref = cp->uncached_klass_ref_index_at(index);
Klass* k_o;
if (force_resolution) {
k_o = cp->klass_at(klass_ref, CHECK_NULL);
} else {
k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
if (k_o == NULL) return NULL;
}
InstanceKlass* k = InstanceKlass::cast(k_o);
Symbol* name = cp->uncached_name_ref_at(index);
Symbol* sig = cp->uncached_signature_ref_at(index);
fieldDescriptor fd;
Klass* target_klass = k->find_field(name, sig, &fd);
if (target_klass == NULL) {
THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
}
oop field = Reflection::new_field(&fd, CHECK_NULL);
return JNIHandles::make_local(field);
}
JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
{
JVMWrapper("JVM_ConstantPoolGetFieldAt");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
return res;
}
JVM_END
JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
return res;
}
JVM_END
JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
constantTag tag = cp->tag_at(index);
if (!tag.is_field_or_method()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
int klass_ref = cp->uncached_klass_ref_index_at(index);
Symbol* klass_name = cp->klass_name_at(klass_ref);
Symbol* member_name = cp->uncached_name_ref_at(index);
Symbol* member_sig = cp->uncached_signature_ref_at(index);
objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
objArrayHandle dest(THREAD, dest_o);
Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
dest->obj_at_put(0, str());
str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
dest->obj_at_put(1, str());
str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
dest->obj_at_put(2, str());
return (jobjectArray) JNIHandles::make_local(dest());
}
JVM_END
JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_0);
constantTag tag = cp->tag_at(index);
if (!tag.is_field_or_method()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
return (jint) cp->uncached_klass_ref_index_at(index);
}
JVM_END
JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_0);
constantTag tag = cp->tag_at(index);
if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
return (jint) cp->uncached_name_and_type_ref_index_at(index);
}
JVM_END
JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
constantTag tag = cp->tag_at(index);
if (!tag.is_name_and_type()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
objArrayHandle dest(THREAD, dest_o);
Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
dest->obj_at_put(0, str());
str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
dest->obj_at_put(1, str());
return (jobjectArray) JNIHandles::make_local(dest());
}
JVM_END
JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetIntAt");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_0);
constantTag tag = cp->tag_at(index);
if (!tag.is_int()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
return cp->int_at(index);
}
JVM_END
JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetLongAt");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_(0L));
constantTag tag = cp->tag_at(index);
if (!tag.is_long()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
return cp->long_at(index);
}
JVM_END
JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetFloatAt");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_(0.0f));
constantTag tag = cp->tag_at(index);
if (!tag.is_float()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
return cp->float_at(index);
}
JVM_END
JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetDoubleAt");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_(0.0));
constantTag tag = cp->tag_at(index);
if (!tag.is_double()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
return cp->double_at(index);
}
JVM_END
JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetStringAt");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
constantTag tag = cp->tag_at(index);
if (!tag.is_string()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
oop str = cp->string_at(index, CHECK_NULL);
return (jstring) JNIHandles::make_local(str);
}
JVM_END
JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetUTF8At");
JvmtiVMObjectAllocEventCollector oam;
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_NULL);
constantTag tag = cp->tag_at(index);
if (!tag.is_symbol()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
}
Symbol* sym = cp->symbol_at(index);
Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
return (jstring) JNIHandles::make_local(str());
}
JVM_END
JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
{
JVMWrapper("JVM_ConstantPoolGetTagAt");
constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
bounds_check(cp, index, CHECK_0);
constantTag tag = cp->tag_at(index);
jbyte result = tag.value();
// If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
// they are changed to the corresponding tags from the JVM spec, so that java code in
// sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
if (tag.is_klass_or_reference()) {
result = JVM_CONSTANT_Class;
} else if (tag.is_string_index()) {
result = JVM_CONSTANT_String;
} else if (tag.is_method_type_in_error()) {
result = JVM_CONSTANT_MethodType;
} else if (tag.is_method_handle_in_error()) {
result = JVM_CONSTANT_MethodHandle;
} else if (tag.is_dynamic_constant_in_error()) {
result = JVM_CONSTANT_Dynamic;
}
return result;
}
JVM_END
// Assertion support. //////////////////////////////////////////////////////////
JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
JVMWrapper("JVM_DesiredAssertionStatus");
assert(cls != NULL, "bad class");
oop r = JNIHandles::resolve(cls);
assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
if (java_lang_Class::is_primitive(r)) return false;
Klass* k = java_lang_Class::as_Klass(r);
assert(k->is_instance_klass(), "must be an instance klass");
if (!k->is_instance_klass()) return false;
ResourceMark rm(THREAD);
const char* name = k->name()->as_C_string();
bool system_class = k->class_loader() == NULL;
return JavaAssertions::enabled(name, system_class);
JVM_END
// Return a new AssertionStatusDirectives object with the fields filled in with
// command-line assertion arguments (i.e., -ea, -da).
JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
JVMWrapper("JVM_AssertionStatusDirectives");
JvmtiVMObjectAllocEventCollector oam;
oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
return JNIHandles::make_local(env, asd);
JVM_END
// Verification ////////////////////////////////////////////////////////////////////////////////
// Reflection for the verifier /////////////////////////////////////////////////////////////////
// RedefineClasses support: bug 6214132 caused verification to fail.
// All functions from this section should call the jvmtiThreadSate function:
// Klass* class_to_verify_considering_redefinition(Klass* klass).
// The function returns a Klass* of the _scratch_class if the verifier
// was invoked in the middle of the class redefinition.
// Otherwise it returns its argument value which is the _the_class Klass*.
// Please, refer to the description in the jvmtiThreadSate.hpp.
JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetClassNameUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
return k->name()->as_utf8();
JVM_END
JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
JVMWrapper("JVM_GetClassCPTypes");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
// types will have length zero if this is not an InstanceKlass
// (length is determined by call to JVM_GetClassCPEntriesCount)
if (k->is_instance_klass()) {
ConstantPool* cp = InstanceKlass::cast(k)->constants();
for (int index = cp->length() - 1; index >= 0; index--) {
constantTag tag = cp->tag_at(index);
types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
}
}
JVM_END
JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetClassCPEntriesCount");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
JVM_END
JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetClassFieldsCount");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
JVM_END
JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
JVMWrapper("JVM_GetClassMethodsCount");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
JVM_END
// The following methods, used for the verifier, are never called with
// array klasses, so a direct cast to InstanceKlass is safe.
// Typically, these methods are called in a loop with bounds determined
// by the results of JVM_GetClass{Fields,Methods}Count, which return
// zero for arrays.
JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
JVMWrapper("JVM_GetMethodIxExceptionIndexes");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
int length = method->checked_exceptions_length();
if (length > 0) {
CheckedExceptionElement* table= method->checked_exceptions_start();
for (int i = 0; i < length; i++) {
exceptions[i] = table[i].class_cp_index;
}
}
JVM_END
JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
JVMWrapper("JVM_GetMethodIxExceptionsCount");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->checked_exceptions_length();
JVM_END
JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
JVMWrapper("JVM_GetMethodIxByteCode");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
memcpy(code, method->code_base(), method->code_size());
JVM_END
JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
JVMWrapper("JVM_GetMethodIxByteCodeLength");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->code_size();
JVM_END
JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
ExceptionTable extable(method);
entry->start_pc = extable.start_pc(entry_index);
entry->end_pc = extable.end_pc(entry_index);
entry->handler_pc = extable.handler_pc(entry_index);
entry->catchType = extable.catch_type_index(entry_index);
JVM_END
JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
JVMWrapper("JVM_GetMethodIxExceptionTableLength");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->exception_table_length();
JVM_END
JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
JVMWrapper("JVM_GetMethodIxModifiers");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
JVM_END
JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
JVMWrapper("JVM_GetFieldIxModifiers");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
JVM_END
JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
JVMWrapper("JVM_GetMethodIxLocalsCount");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->max_locals();
JVM_END
JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
JVMWrapper("JVM_GetMethodIxArgsSize");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->size_of_parameters();
JVM_END
JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
JVMWrapper("JVM_GetMethodIxMaxStack");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->verifier_max_stack();
JVM_END
JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
JVMWrapper("JVM_IsConstructorIx");
ResourceMark rm(THREAD);
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->name() == vmSymbols::object_initializer_name();
JVM_END
JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
JVMWrapper("JVM_IsVMGeneratedMethodIx");
ResourceMark rm(THREAD);
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->is_overpass();
JVM_END
JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
JVMWrapper("JVM_GetMethodIxIxUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->name()->as_utf8();
JVM_END
JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
JVMWrapper("JVM_GetMethodIxSignatureUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
return method->signature()->as_utf8();
JVM_END
/**
* All of these JVM_GetCP-xxx methods are used by the old verifier to
* read entries in the constant pool. Since the old verifier always
* works on a copy of the code, it will not see any rewriting that
* may possibly occur in the middle of verification. So it is important
* that nothing it calls tries to use the cpCache instead of the raw
* constant pool, so we must use cp->uncached_x methods when appropriate.
*/
JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
JVMWrapper("JVM_GetCPFieldNameUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
switch (cp->tag_at(cp_index).value()) {
case JVM_CONSTANT_Fieldref:
return cp->uncached_name_ref_at(cp_index)->as_utf8();
default:
fatal("JVM_GetCPFieldNameUTF: illegal constant");
}
ShouldNotReachHere();
return NULL;
JVM_END
JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
JVMWrapper("JVM_GetCPMethodNameUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
switch (cp->tag_at(cp_index).value()) {
case JVM_CONSTANT_InterfaceMethodref:
case JVM_CONSTANT_Methodref:
return cp->uncached_name_ref_at(cp_index)->as_utf8();
default:
fatal("JVM_GetCPMethodNameUTF: illegal constant");
}
ShouldNotReachHere();
return NULL;
JVM_END
JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
JVMWrapper("JVM_GetCPMethodSignatureUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
switch (cp->tag_at(cp_index).value()) {
case JVM_CONSTANT_InterfaceMethodref:
case JVM_CONSTANT_Methodref:
return cp->uncached_signature_ref_at(cp_index)->as_utf8();
default:
fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
}
ShouldNotReachHere();
return NULL;
JVM_END
JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
JVMWrapper("JVM_GetCPFieldSignatureUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
switch (cp->tag_at(cp_index).value()) {
case JVM_CONSTANT_Fieldref:
return cp->uncached_signature_ref_at(cp_index)->as_utf8();
default:
fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
}
ShouldNotReachHere();
return NULL;
JVM_END
JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
JVMWrapper("JVM_GetCPClassNameUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
Symbol* classname = cp->klass_name_at(cp_index);
return classname->as_utf8();
JVM_END
JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
JVMWrapper("JVM_GetCPFieldClassNameUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
switch (cp->tag_at(cp_index).value()) {
case JVM_CONSTANT_Fieldref: {
int class_index = cp->uncached_klass_ref_index_at(cp_index);
Symbol* classname = cp->klass_name_at(class_index);
return classname->as_utf8();
}
default:
fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
}
ShouldNotReachHere();
return NULL;
JVM_END
JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
JVMWrapper("JVM_GetCPMethodClassNameUTF");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
switch (cp->tag_at(cp_index).value()) {
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref: {
int class_index = cp->uncached_klass_ref_index_at(cp_index);
Symbol* classname = cp->klass_name_at(class_index);
return classname->as_utf8();
}
default:
fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
}
ShouldNotReachHere();
return NULL;
JVM_END
JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
JVMWrapper("JVM_GetCPFieldModifiers");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
switch (cp->tag_at(cp_index).value()) {
case JVM_CONSTANT_Fieldref: {
Symbol* name = cp->uncached_name_ref_at(cp_index);
Symbol* signature = cp->uncached_signature_ref_at(cp_index);
InstanceKlass* ik = InstanceKlass::cast(k_called);
for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
if (fs.name() == name && fs.signature() == signature) {
return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
}
}
return -1;
}
default:
fatal("JVM_GetCPFieldModifiers: illegal constant");
}
ShouldNotReachHere();
return 0;
JVM_END
JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
JVMWrapper("JVM_GetCPMethodModifiers");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
ConstantPool* cp = InstanceKlass::cast(k)->constants();
switch (cp->tag_at(cp_index).value()) {
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref: {
Symbol* name = cp->uncached_name_ref_at(cp_index);
Symbol* signature = cp->uncached_signature_ref_at(cp_index);
Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
int methods_count = methods->length();
for (int i = 0; i < methods_count; i++) {
Method* method = methods->at(i);
if (method->name() == name && method->signature() == signature) {
return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
}
}
return -1;
}
default:
fatal("JVM_GetCPMethodModifiers: illegal constant");
}
ShouldNotReachHere();
return 0;
JVM_END
// Misc //////////////////////////////////////////////////////////////////////////////////////////////
JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
// So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
JVM_END
JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
JVMWrapper("JVM_IsSameClassPackage");
oop class1_mirror = JNIHandles::resolve_non_null(class1);
oop class2_mirror = JNIHandles::resolve_non_null(class2);
Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
return (jboolean) Reflection::is_same_class_package(klass1, klass2);
JVM_END
// Printing support //////////////////////////////////////////////////
extern "C" {
ATTRIBUTE_PRINTF(3, 0)
int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
// Reject count values that are negative signed values converted to
// unsigned; see bug 4399518, 4417214
if ((intptr_t)count <= 0) return -1;
int result = os::vsnprintf(str, count, fmt, args);
if (result > 0 && (size_t)result >= count) {
result = -1;
}
return result;
}
ATTRIBUTE_PRINTF(3, 4)
int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
va_list args;
int len;
va_start(args, fmt);
len = jio_vsnprintf(str, count, fmt, args);
va_end(args);
return len;
}
ATTRIBUTE_PRINTF(2, 3)
int jio_fprintf(FILE* f, const char *fmt, ...) {
int len;
va_list args;
va_start(args, fmt);
len = jio_vfprintf(f, fmt, args);
va_end(args);
return len;
}
ATTRIBUTE_PRINTF(2, 0)
int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
if (Arguments::vfprintf_hook() != NULL) {
return Arguments::vfprintf_hook()(f, fmt, args);
} else {
return vfprintf(f, fmt, args);
}
}
ATTRIBUTE_PRINTF(1, 2)
JNIEXPORT int jio_printf(const char *fmt, ...) {
int len;
va_list args;
va_start(args, fmt);
len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
va_end(args);
return len;
}
// HotSpot specific jio method
void jio_print(const char* s, size_t len) {
// Try to make this function as atomic as possible.
if (Arguments::vfprintf_hook() != NULL) {
jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
} else {
// Make an unused local variable to avoid warning from gcc 4.x compiler.
size_t count = ::write(defaultStream::output_fd(), s, (int)len);
}
}
} // Extern C
// java.lang.Thread //////////////////////////////////////////////////////////////////////////////
// In most of the JVM thread support functions we need to access the
// thread through a ThreadsListHandle to prevent it from exiting and
// being reclaimed while we try to operate on it. The exceptions to this
// rule are when operating on the current thread, or if the monitor of
// the target java.lang.Thread is locked at the Java level - in both
// cases the target cannot exit.
static void thread_entry(JavaThread* thread, TRAPS) {
HandleMark hm(THREAD);
Handle obj(THREAD, thread->threadObj());
JavaValue result(T_VOID);
JavaCalls::call_virtual(&result,
obj,
SystemDictionary::Thread_klass(),
vmSymbols::run_method_name(),
vmSymbols::void_method_signature(),
THREAD);
}
JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
JVMWrapper("JVM_StartThread");
JavaThread *native_thread = NULL;
// We cannot hold the Threads_lock when we throw an exception,
// due to rank ordering issues. Example: we might need to grab the
// Heap_lock while we construct the exception.
bool throw_illegal_thread_state = false;
// We must release the Threads_lock before we can post a jvmti event
// in Thread::start.
{
// Ensure that the C++ Thread and OSThread structures aren't freed before
// we operate.
MutexLocker mu(Threads_lock);
// Since JDK 5 the java.lang.Thread threadStatus is used to prevent
// re-starting an already started thread, so we should usually find
// that the JavaThread is null. However for a JNI attached thread
// there is a small window between the Thread object being created
// (with its JavaThread set) and the update to its threadStatus, so we
// have to check for this
if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
throw_illegal_thread_state = true;
} else {
// We could also check the stillborn flag to see if this thread was already stopped, but
// for historical reasons we let the thread detect that itself when it starts running
jlong size =
java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
// Allocate the C++ Thread structure and create the native thread. The
// stack size retrieved from java is 64-bit signed, but the constructor takes
// size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
// - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
// - Avoid passing negative values which would result in really large stacks.
NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
size_t sz = size > 0 ? (size_t) size : 0;
native_thread = new JavaThread(&thread_entry, sz);
// At this point it may be possible that no osthread was created for the
// JavaThread due to lack of memory. Check for this situation and throw
// an exception if necessary. Eventually we may want to change this so
// that we only grab the lock if the thread was created successfully -
// then we can also do this check and throw the exception in the
// JavaThread constructor.
if (native_thread->osthread() != NULL) {
// Note: the current thread is not being used within "prepare".
native_thread->prepare(jthread);
}
}
}
if (throw_illegal_thread_state) {
THROW(vmSymbols::java_lang_IllegalThreadStateException());
}
assert(native_thread != NULL, "Starting null thread?");
if (native_thread->osthread() == NULL) {
// No one should hold a reference to the 'native_thread'.
native_thread->smr_delete();
if (JvmtiExport::should_post_resource_exhausted()) {
JvmtiExport::post_resource_exhausted(
JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
os::native_thread_creation_failed_msg());
}
THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
os::native_thread_creation_failed_msg());
}
Thread::start(native_thread);
JVM_END
// JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
// before the quasi-asynchronous exception is delivered. This is a little obtrusive,
// but is thought to be reliable and simple. In the case, where the receiver is the
// same thread as the sender, no VM_Operation is needed.
JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
JVMWrapper("JVM_StopThread");
// A nested ThreadsListHandle will grab the Threads_lock so create
// tlh before we resolve throwable.
ThreadsListHandle tlh(thread);
oop java_throwable = JNIHandles::resolve(throwable);
if (java_throwable == NULL) {
THROW(vmSymbols::java_lang_NullPointerException());
}
oop java_thread = NULL;
JavaThread* receiver = NULL;
bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
Events::log_exception(thread,
"JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
p2i(receiver), p2i((address)java_thread), p2i(throwable));
if (is_alive) {
// jthread refers to a live JavaThread.
if (thread == receiver) {
// Exception is getting thrown at self so no VM_Operation needed.
THROW_OOP(java_throwable);
} else {
// Use a VM_Operation to throw the exception.
Thread::send_async_exception(java_thread, java_throwable);
}
} else {
// Either:
// - target thread has not been started before being stopped, or
// - target thread already terminated
// We could read the threadStatus to determine which case it is
// but that is overkill as it doesn't matter. We must set the
// stillborn flag for the first case, and if the thread has already
// exited setting this flag has no effect.
java_lang_Thread::set_stillborn(java_thread);
}
JVM_END
JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
JVMWrapper("JVM_IsThreadAlive");
oop thread_oop = JNIHandles::resolve_non_null(jthread);
return java_lang_Thread::is_alive(thread_oop);
JVM_END
JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
JVMWrapper("JVM_SuspendThread");
ThreadsListHandle tlh(thread);
JavaThread* receiver = NULL;
bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
if (is_alive) {
// jthread refers to a live JavaThread.
{
MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
if (receiver->is_external_suspend()) {
// Don't allow nested external suspend requests. We can't return
// an error from this interface so just ignore the problem.
return;
}
if (receiver->is_exiting()) { // thread is in the process of exiting
return;
}
receiver->set_external_suspend();
}
// java_suspend() will catch threads in the process of exiting
// and will ignore them.
receiver->java_suspend();
// It would be nice to have the following assertion in all the
// time, but it is possible for a racing resume request to have
// resumed this thread right after we suspended it. Temporarily
// enable this assertion if you are chasing a different kind of
// bug.
//
// assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
// receiver->is_being_ext_suspended(), "thread is not suspended");
}
JVM_END
JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
JVMWrapper("JVM_ResumeThread");
ThreadsListHandle tlh(thread);
JavaThread* receiver = NULL;
bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
if (is_alive) {
// jthread refers to a live JavaThread.
// This is the original comment for this Threads_lock grab:
// We need to *always* get the threads lock here, since this operation cannot be allowed during
// a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
// threads randomly resumes threads, then a thread might not be suspended when the safepoint code
// looks at it.
//
// The above comment dates back to when we had both internal and
// external suspend APIs that shared a common underlying mechanism.
// External suspend is now entirely cooperative and doesn't share
// anything with internal suspend. That said, there are some
// assumptions in the VM that an external resume grabs the
// Threads_lock. We can't drop the Threads_lock grab here until we
// resolve the assumptions that exist elsewhere.
//
MutexLocker ml(Threads_lock);
receiver->java_resume();
}
JVM_END
JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
JVMWrapper("JVM_SetThreadPriority");
ThreadsListHandle tlh(thread);
oop java_thread = NULL;
JavaThread* receiver = NULL;
bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
if (is_alive) {
// jthread refers to a live JavaThread.
Thread::set_priority(receiver, (ThreadPriority)prio);
}
// Implied else: If the JavaThread hasn't started yet, then the
// priority set in the java.lang.Thread object above will be pushed
// down when it does start.
JVM_END
JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
JVMWrapper("JVM_Yield");
if (os::dont_yield()) return;
HOTSPOT_THREAD_YIELD();
os::naked_yield();
JVM_END
static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
assert(event != NULL, "invariant");
assert(event->should_commit(), "invariant");
event->set_time(millis);
event->commit();
}
JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
JVMWrapper("JVM_Sleep");
if (millis < 0) {
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
}
if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
}
// Save current thread state and restore it at the end of this block.
// And set new thread state to SLEEPING.
JavaThreadSleepState jtss(thread);
HOTSPOT_THREAD_SLEEP_BEGIN(millis);
EventThreadSleep event;
if (millis == 0) {
os::naked_yield();
} else {
ThreadState old_state = thread->osthread()->get_state();
thread->osthread()->set_state(SLEEPING);
if (!thread->sleep(millis)) { // interrupted
// An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
// us while we were sleeping. We do not overwrite those.
if (!HAS_PENDING_EXCEPTION) {
if (event.should_commit()) {
post_thread_sleep_event(&event, millis);
}
HOTSPOT_THREAD_SLEEP_END(1);
// TODO-FIXME: THROW_MSG returns which means we will not call set_state()
// to properly restore the thread state. That's likely wrong.
THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
}
}
thread->osthread()->set_state(old_state);
}
if (event.should_commit()) {
post_thread_sleep_event(&event, millis);
}
HOTSPOT_THREAD_SLEEP_END(0);
JVM_END
JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
JVMWrapper("JVM_CurrentThread");
oop jthread = thread->threadObj();
assert (thread != NULL, "no current thread!");
return JNIHandles::make_local(env, jthread);
JVM_END
JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
JVMWrapper("JVM_Interrupt");
ThreadsListHandle tlh(thread);
JavaThread* receiver = NULL;
bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
if (is_alive) {
// jthread refers to a live JavaThread.
receiver->interrupt();
}
JVM_END
// Return true iff the current thread has locked the object passed in
JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
JVMWrapper("JVM_HoldsLock");
assert(THREAD->is_Java_thread(), "sanity check");
if (obj == NULL) {
THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
}
Handle h_obj(THREAD, JNIHandles::resolve(obj));
return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
JVM_END
JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
JVMWrapper("JVM_DumpAllStacks");
VM_PrintThreads op;
VMThread::execute(&op);
if (JvmtiExport::should_post_data_dump()) {
JvmtiExport::post_data_dump();
}
JVM_END
JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
JVMWrapper("JVM_SetNativeThreadName");
// We don't use a ThreadsListHandle here because the current thread
// must be alive.
oop java_thread = JNIHandles::resolve_non_null(jthread);
JavaThread* thr = java_lang_Thread::thread(java_thread);
if (thread == thr && !thr->has_attached_via_jni()) {
// Thread naming is only supported for the current thread and
// we don't set the name of an attached thread to avoid stepping
// on other programs.
ResourceMark rm(thread);
const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
os::set_native_thread_name(thread_name);
}
JVM_END
// java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
JVMWrapper("JVM_GetClassContext");
ResourceMark rm(THREAD);
JvmtiVMObjectAllocEventCollector oam;
vframeStream vfst(thread);
if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
// This must only be called from SecurityManager.getClassContext
Method* m = vfst.method();
if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
m->name() == vmSymbols::getClassContext_name() &&
m->signature() == vmSymbols::void_class_array_signature())) {
THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
}
}
// Collect method holders
GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
for (; !vfst.at_end(); vfst.security_next()) {
Method* m = vfst.method();
// Native frames are not returned
if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
Klass* holder = m->method_holder();
assert(holder->is_klass(), "just checking");
klass_array->append(holder);
}
}
// Create result array of type [Ljava/lang/Class;
objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
// Fill in mirrors corresponding to method holders
for (int i = 0; i < klass_array->length(); i++) {
result->obj_at_put(i, klass_array->at(i)->java_mirror());
}
return (jobjectArray) JNIHandles::make_local(env, result);
JVM_END
// java.lang.Package ////////////////////////////////////////////////////////////////
JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
JVMWrapper("JVM_GetSystemPackage");
ResourceMark rm(THREAD);
JvmtiVMObjectAllocEventCollector oam;
char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
oop result = ClassLoader::get_system_package(str, CHECK_NULL);
return (jstring) JNIHandles::make_local(result);
JVM_END
JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
JVMWrapper("JVM_GetSystemPackages");
JvmtiVMObjectAllocEventCollector oam;
objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
return (jobjectArray) JNIHandles::make_local(result);
JVM_END
// java.lang.ref.Reference ///////////////////////////////////////////////////////////////
JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
JVMWrapper("JVM_GetAndClearReferencePendingList");
MonitorLocker ml(Heap_lock);
oop ref = Universe::reference_pending_list();
if (ref != NULL) {
Universe::set_reference_pending_list(NULL);
}
return JNIHandles::make_local(env, ref);
JVM_END
JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
JVMWrapper("JVM_HasReferencePendingList");
MonitorLocker ml(Heap_lock);
return Universe::has_reference_pending_list();
JVM_END
JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
JVMWrapper("JVM_WaitForReferencePendingList");
MonitorLocker ml(Heap_lock);
while (!Universe::has_reference_pending_list()) {
ml.wait();
}
JVM_END
// ObjectInputStream ///////////////////////////////////////////////////////////////
// Return the first user-defined class loader up the execution stack, or null
// if only code from the bootstrap or platform class loader is on the stack.
JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
oop loader = vfst.method()->method_holder()->class_loader();
if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
return JNIHandles::make_local(env, loader);
}
}
return NULL;
JVM_END
// Array ///////////////////////////////////////////////////////////////////////////////////////////
// resolve array handle and check arguments
static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
if (arr == NULL) {
THROW_0(vmSymbols::java_lang_NullPointerException());
}
oop a = JNIHandles::resolve_non_null(arr);
if (!a->is_array()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
} else if (type_array_only && !a->is_typeArray()) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
}
return arrayOop(a);
}
JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
JVMWrapper("JVM_GetArrayLength");
arrayOop a = check_array(env, arr, false, CHECK_0);
return a->length();
JVM_END
JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
JVMWrapper("JVM_Array_Get");
JvmtiVMObjectAllocEventCollector oam;
arrayOop a = check_array(env, arr, false, CHECK_NULL);
jvalue value;
BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
oop box = Reflection::box(&value, type, CHECK_NULL);
return JNIHandles::make_local(env, box);
JVM_END
JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
JVMWrapper("JVM_GetPrimitiveArrayElement");
jvalue value;
value.i = 0; // to initialize value before getting used in CHECK
arrayOop a = check_array(env, arr, true, CHECK_(value));
assert(a->is_typeArray(), "just checking");
BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
BasicType wide_type = (BasicType) wCode;
if (type != wide_type) {
Reflection::widen(&value, type, wide_type, CHECK_(value));
}
return value;
JVM_END
JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
JVMWrapper("JVM_SetArrayElement");
arrayOop a = check_array(env, arr, false, CHECK);
oop box = JNIHandles::resolve(val);
jvalue value;
value.i = 0; // to initialize value before getting used in CHECK
BasicType value_type;
if (a->is_objArray()) {
// Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
value_type = Reflection::unbox_for_regular_object(box, &value);
} else {
value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
}
Reflection::array_set(&value, a, index, value_type, CHECK);
JVM_END
JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
JVMWrapper("JVM_SetPrimitiveArrayElement");
arrayOop a = check_array(env, arr, true, CHECK);
assert(a->is_typeArray(), "just checking");
BasicType value_type = (BasicType) vCode;
Reflection::array_set(&v, a, index, value_type, CHECK);
JVM_END
JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
JVMWrapper("JVM_NewArray");
JvmtiVMObjectAllocEventCollector oam;
oop element_mirror = JNIHandles::resolve(eltClass);
oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
return JNIHandles::make_local(env, result);
JVM_END
JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
JVMWrapper("JVM_NewMultiArray");
JvmtiVMObjectAllocEventCollector oam;
arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
oop element_mirror = JNIHandles::resolve(eltClass);
assert(dim_array->is_typeArray(), "just checking");
oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
return JNIHandles::make_local(env, result);
JVM_END
// Library support ///////////////////////////////////////////////////////////////////////////
JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
//%note jvm_ct
JVMWrapper("JVM_LoadLibrary");
char ebuf[1024];
void *load_result;
{
ThreadToNativeFromVM ttnfvm(thread);
load_result = os::dll_load(name, ebuf, sizeof ebuf);
}
if (load_result == NULL) {
char msg[1024];
jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
// Since 'ebuf' may contain a string encoded using
// platform encoding scheme, we need to pass
// Exceptions::unsafe_to_utf8 to the new_exception method
// as the last argument. See bug 6367357.
Handle h_exception =
Exceptions::new_exception(thread,
vmSymbols::java_lang_UnsatisfiedLinkError(),
msg, Exceptions::unsafe_to_utf8);
THROW_HANDLE_0(h_exception);
}
return load_result;
JVM_END
JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
JVMWrapper("JVM_UnloadLibrary");
os::dll_unload(handle);
JVM_END
JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
JVMWrapper("JVM_FindLibraryEntry");
return os::dll_lookup(handle, name);
JVM_END
// JNI version ///////////////////////////////////////////////////////////////////////////////
JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
JVMWrapper("JVM_IsSupportedJNIVersion");
return Threads::is_supported_jni_version_including_1_1(version);
JVM_END
// String support ///////////////////////////////////////////////////////////////////////////
JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
JVMWrapper("JVM_InternString");
JvmtiVMObjectAllocEventCollector oam;
if (str == NULL) return NULL;
oop string = JNIHandles::resolve_non_null(str);
oop result = StringTable::intern(string, CHECK_NULL);
return (jstring) JNIHandles::make_local(env, result);
JVM_END
// VM Raw monitor support //////////////////////////////////////////////////////////////////////
// VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
// lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
// library code. They may be used by JavaThreads and non-JavaThreads and do not participate
// in the safepoint protocol, thread suspension, thread interruption, or anything of that
// nature. JavaThreads will be "in native" when using this API from JDK code.
JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
VM_Exit::block_if_vm_exited();
JVMWrapper("JVM_RawMonitorCreate");
return new os::PlatformMutex();
}
JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
VM_Exit::block_if_vm_exited();
JVMWrapper("JVM_RawMonitorDestroy");
delete ((os::PlatformMutex*) mon);
}
JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
VM_Exit::block_if_vm_exited();
JVMWrapper("JVM_RawMonitorEnter");
((os::PlatformMutex*) mon)->lock();
return 0;
}
JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
VM_Exit::block_if_vm_exited();
JVMWrapper("JVM_RawMonitorExit");
((os::PlatformMutex*) mon)->unlock();
}
// Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
Handle loader, Handle protection_domain,
jboolean throwError, TRAPS) {
// Security Note:
// The Java level wrapper will perform the necessary security check allowing
// us to pass the NULL as the initiating class loader. The VM is responsible for
// the checkPackageAccess relative to the initiating class loader via the
// protection_domain. The protection_domain is passed as NULL by the java code
// if there is no security manager in 3-arg Class.forName().
Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
// Check if we should initialize the class
if (init && klass->is_instance_klass()) {
klass->initialize(CHECK_NULL);
}
return (jclass) JNIHandles::make_local(env, klass->java_mirror());
}
// Method ///////////////////////////////////////////////////////////////////////////////////////////
JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
JVMWrapper("JVM_InvokeMethod");
Handle method_handle;
if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
method_handle = Handle(THREAD, JNIHandles::resolve(method));
Handle receiver(THREAD, JNIHandles::resolve(obj));
objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
jobject res = JNIHandles::make_local(env, result);
if (JvmtiExport::should_post_vm_object_alloc()) {
oop ret_type = java_lang_reflect_Method::return_type(method_handle());
assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
if (java_lang_Class::is_primitive(ret_type)) {
// Only for primitive type vm allocates memory for java object.
// See box() method.
JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
}
}
return res;
} else {
THROW_0(vmSymbols::java_lang_StackOverflowError());
}
JVM_END
JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
JVMWrapper("JVM_NewInstanceFromConstructor");
oop constructor_mirror = JNIHandles::resolve(c);
objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
jobject res = JNIHandles::make_local(env, result);
if (JvmtiExport::should_post_vm_object_alloc()) {
JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
}
return res;
JVM_END
// Atomic ///////////////////////////////////////////////////////////////////////////////////////////
JVM_LEAF(jboolean, JVM_SupportsCX8())
JVMWrapper("JVM_SupportsCX8");
return VM_Version::supports_cx8();
JVM_END
JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
JVMWrapper("JVM_InitializeFromArchive");
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
assert(k->is_klass(), "just checking");
HeapShared::initialize_from_archived_subgraph(k);
JVM_END
// Returns an array of all live Thread objects (VM internal JavaThreads,
// jvmti agent threads, and JNI attaching threads are skipped)
// See CR 6404306 regarding JNI attaching threads
JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
ResourceMark rm(THREAD);
ThreadsListEnumerator tle(THREAD, false, false);
JvmtiVMObjectAllocEventCollector oam;
int num_threads = tle.num_threads();
objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
objArrayHandle threads_ah(THREAD, r);
for (int i = 0; i < num_threads; i++) {
Handle h = tle.get_threadObj(i);
threads_ah->obj_at_put(i, h());
}
return (jobjectArray) JNIHandles::make_local(env, threads_ah());
JVM_END
// Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
// Return StackTraceElement[][], each element is the stack trace of a thread in
// the corresponding entry in the given threads array
JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
JVMWrapper("JVM_DumpThreads");
JvmtiVMObjectAllocEventCollector oam;
// Check if threads is null
if (threads == NULL) {
THROW_(vmSymbols::java_lang_NullPointerException(), 0);
}
objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
objArrayHandle ah(THREAD, a);
int num_threads = ah->length();
// check if threads is non-empty array
if (num_threads == 0) {
THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
}
// check if threads is not an array of objects of Thread class
Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
if (k != SystemDictionary::Thread_klass()) {
THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
}
ResourceMark rm(THREAD);
GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
for (int i = 0; i < num_threads; i++) {
oop thread_obj = ah->obj_at(i);
instanceHandle h(THREAD, (instanceOop) thread_obj);
thread_handle_array->append(h);
}
// The JavaThread references in thread_handle_array are validated
// in VM_ThreadDump::doit().
Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
return (jobjectArray)JNIHandles::make_local(env, stacktraces());
JVM_END
// JVM monitoring and management support
JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
return Management::get_jmm_interface(version);
JVM_END
// com.sun.tools.attach.VirtualMachine agent properties support
//
// Initialize the agent properties with the properties maintained in the VM
JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
JVMWrapper("JVM_InitAgentProperties");
ResourceMark rm;
Handle props(THREAD, JNIHandles::resolve_non_null(properties));
PUTPROP(props, "sun.java.command", Arguments::java_command());
PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
return properties;
JVM_END
JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
{
JVMWrapper("JVM_GetEnclosingMethodInfo");
JvmtiVMObjectAllocEventCollector oam;
if (ofClass == NULL) {
return NULL;
}
Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
// Special handling for primitive objects
if (java_lang_Class::is_primitive(mirror())) {
return NULL;
}
Klass* k = java_lang_Class::as_Klass(mirror());
if (!k->is_instance_klass()) {
return NULL;
}
InstanceKlass* ik = InstanceKlass::cast(k);
int encl_method_class_idx = ik->enclosing_method_class_index();
if (encl_method_class_idx == 0) {
return NULL;
}
objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
objArrayHandle dest(THREAD, dest_o);
Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
dest->obj_at_put(0, enc_k->java_mirror());
int encl_method_method_idx = ik->enclosing_method_method_index();
if (encl_method_method_idx != 0) {
Symbol* sym = ik->constants()->symbol_at(
extract_low_short_from_int(
ik->constants()->name_and_type_at(encl_method_method_idx)));
Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
dest->obj_at_put(1, str());
sym = ik->constants()->symbol_at(
extract_high_short_from_int(
ik->constants()->name_and_type_at(encl_method_method_idx)));
str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
dest->obj_at_put(2, str());
}
return (jobjectArray) JNIHandles::make_local(dest());
}
JVM_END
JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
{
memset(info, 0, info_size);
info->jvm_version = VM_Version::jvm_version();
info->patch_version = VM_Version::vm_patch_version();
// when we add a new capability in the jvm_version_info struct, we should also
// consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
// counter defined in runtimeService.cpp.
info->is_attach_supported = AttachListener::is_attach_supported();
}
JVM_END
// Returns an array of java.lang.String objects containing the input arguments to the VM.
JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
ResourceMark rm(THREAD);
if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
return NULL;
}
char** vm_flags = Arguments::jvm_flags_array();
char** vm_args = Arguments::jvm_args_array();
int num_flags = Arguments::num_jvm_flags();
int num_args = Arguments::num_jvm_args();
InstanceKlass* ik = SystemDictionary::String_klass();
objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
objArrayHandle result_h(THREAD, r);
int index = 0;
for (int j = 0; j < num_flags; j++, index++) {
Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
result_h->obj_at_put(index, h());
}
for (int i = 0; i < num_args; i++, index++) {
Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
result_h->obj_at_put(index, h());
}
return (jobjectArray) JNIHandles::make_local(env, result_h());
JVM_END
JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
return os::get_signal_number(name);
JVM_END