Mercurial > hg > graal-compiler
diff src/share/vm/prims/jni.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | ba764ed4b6f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/prims/jni.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,3582 @@ +/* + * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_jni.cpp.incl" + +static jint CurrentVersion = JNI_VERSION_1_6; + + +// The DT_RETURN_MARK macros create a scoped object to fire the dtrace +// '-return' probe regardless of the return path is taken out of the function. +// Methods that have multiple return paths use this to avoid having to +// instrument each return path. Methods that use CHECK or THROW must use this +// since those macros can cause an immedate uninstrumented return. +// +// In order to get the return value, a reference to the variable containing +// the return value must be passed to the contructor of the object, and +// the return value must be set before return (since the mark object has +// a reference to it). +// +// Example: +// DT_RETURN_MARK_DECL(SomeFunc, int); +// JNI_ENTRY(int, SomeFunc, ...) +// int return_value = 0; +// DT_RETURN_MARK(SomeFunc, int, (const int&)return_value); +// foo(CHECK_0) +// return_value = 5; +// return return_value; +// JNI_END +#define DT_RETURN_MARK_DECL(name, type) \ + HS_DTRACE_PROBE_DECL1(hotspot_jni, name##__return, type); \ + DTRACE_ONLY( \ + class DTraceReturnProbeMark_##name { \ + public: \ + const type& _ret_ref; \ + DTraceReturnProbeMark_##name(const type& v) : _ret_ref(v) {} \ + ~DTraceReturnProbeMark_##name() { \ + HS_DTRACE_PROBE1(hotspot_jni, name##__return, _ret_ref); \ + } \ + } \ + ) +// Void functions are simpler since there's no return value +#define DT_VOID_RETURN_MARK_DECL(name) \ + HS_DTRACE_PROBE_DECL0(hotspot_jni, name##__return); \ + DTRACE_ONLY( \ + class DTraceReturnProbeMark_##name { \ + public: \ + ~DTraceReturnProbeMark_##name() { \ + HS_DTRACE_PROBE0(hotspot_jni, name##__return); \ + } \ + } \ + ) + + +// Place these macros in the function to mark the return. Non-void +// functions need the type and address of the return value. +#define DT_RETURN_MARK(name, type, ref) \ + DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark(ref) ) +#define DT_VOID_RETURN_MARK(name) \ + DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark ) + + +// Use these to select distinct code for floating-point vs. non-floating point +// situations. Used from within common macros where we need slightly +// different behavior for Float/Double +#define FP_SELECT_Boolean(intcode, fpcode) intcode +#define FP_SELECT_Byte(intcode, fpcode) intcode +#define FP_SELECT_Char(intcode, fpcode) intcode +#define FP_SELECT_Short(intcode, fpcode) intcode +#define FP_SELECT_Object(intcode, fpcode) intcode +#define FP_SELECT_Int(intcode, fpcode) intcode +#define FP_SELECT_Long(intcode, fpcode) intcode +#define FP_SELECT_Float(intcode, fpcode) fpcode +#define FP_SELECT_Double(intcode, fpcode) fpcode +#define FP_SELECT(TypeName, intcode, fpcode) \ + FP_SELECT_##TypeName(intcode, fpcode) + +#define COMMA , + +// Choose DT_RETURN_MARK macros based on the type: float/double -> void +// (dtrace doesn't do FP yet) +#define DT_RETURN_MARK_DECL_FOR(TypeName, name, type) \ + FP_SELECT(TypeName, \ + DT_RETURN_MARK_DECL(name, type), DT_VOID_RETURN_MARK_DECL(name) ) +#define DT_RETURN_MARK_FOR(TypeName, name, type, ref) \ + FP_SELECT(TypeName, \ + DT_RETURN_MARK(name, type, ref), DT_VOID_RETURN_MARK(name) ) + + +// out-of-line helpers for class jfieldIDWorkaround: + +bool jfieldIDWorkaround::is_valid_jfieldID(klassOop k, jfieldID id) { + if (jfieldIDWorkaround::is_instance_jfieldID(k, id)) { + uintptr_t as_uint = (uintptr_t) id; + intptr_t offset = raw_instance_offset(id); + if (is_checked_jfieldID(id)) { + if (!klass_hash_ok(k, id)) { + return false; + } + } + return instanceKlass::cast(k)->contains_field_offset(offset); + } else { + JNIid* result = (JNIid*) id; +#ifdef ASSERT + return result != NULL && result->is_static_field_id(); +#else + return result != NULL; +#endif + } +} + + +intptr_t jfieldIDWorkaround::encode_klass_hash(klassOop k, intptr_t offset) { + if (offset <= small_offset_mask) { + klassOop field_klass = k; + klassOop super_klass = Klass::cast(field_klass)->super(); + while (instanceKlass::cast(super_klass)->contains_field_offset(offset)) { + field_klass = super_klass; // super contains the field also + super_klass = Klass::cast(field_klass)->super(); + } + debug_only(No_Safepoint_Verifier nosafepoint;) + uintptr_t klass_hash = field_klass->identity_hash(); + return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place; + } else { +#if 0 + #ifndef PRODUCT + { + ResourceMark rm; + warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name()); + } + #endif +#endif + return 0; + } +} + +bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) { + uintptr_t as_uint = (uintptr_t) id; + intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask; + do { + debug_only(No_Safepoint_Verifier nosafepoint;) + // Could use a non-blocking query for identity_hash here... + if ((k->identity_hash() & klass_mask) == klass_hash) + return true; + k = Klass::cast(k)->super(); + } while (k != NULL); + return false; +} + +void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) { + guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" ); + uintptr_t as_uint = (uintptr_t) id; + intptr_t offset = raw_instance_offset(id); + if (VerifyJNIFields) { + if (is_checked_jfieldID(id)) { + guarantee(klass_hash_ok(k, id), + "Bug in native code: jfieldID class must match object"); + } else { +#if 0 + #ifndef PRODUCT + if (Verbose) { + ResourceMark rm; + warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name()); + } + #endif +#endif + } + } + guarantee(instanceKlass::cast(k)->contains_field_offset(offset), + "Bug in native code: jfieldID offset must address interior of object"); +} + +// Pick a reasonable higher bound for local capacity requested +// for EnsureLocalCapacity and PushLocalFrame. We don't want it too +// high because a test (or very unusual application) may try to allocate +// that many handles and run out of swap space. An implementation is +// permitted to allocate more handles than the ensured capacity, so this +// value is set high enough to prevent compatibility problems. +const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K; + + +// Wrapper to trace JNI functions + +#ifdef ASSERT + Histogram* JNIHistogram; + static volatile jint JNIHistogram_lock = 0; + + class JNITraceWrapper : public StackObj { + public: + JNITraceWrapper(const char* format, ...) { + if (TraceJNICalls) { + va_list ap; + va_start(ap, format); + tty->print("JNI "); + tty->vprint_cr(format, ap); + va_end(ap); + } + } + }; + + class JNIHistogramElement : public HistogramElement { + public: + JNIHistogramElement(const char* name); + }; + + JNIHistogramElement::JNIHistogramElement(const char* elementName) { + _name = elementName; + uintx count = 0; + + while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) { + while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) { + count +=1; + if ( (WarnOnStalledSpinLock > 0) + && (count % WarnOnStalledSpinLock == 0)) { + warning("JNIHistogram_lock seems to be stalled"); + } + } + } + + + if(JNIHistogram == NULL) + JNIHistogram = new Histogram("JNI Call Counts",100); + + JNIHistogram->add_element(this); + Atomic::dec(&JNIHistogram_lock); + } + + #define JNICountWrapper(arg) \ + static JNIHistogramElement* e = new JNIHistogramElement(arg); \ + /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \ + if (e != NULL) e->increment_count() + #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg) +#else + #define JNIWrapper(arg) +#endif + + +// Implementation of JNI entries + +DT_RETURN_MARK_DECL(DefineClass, jclass); + +JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef, + const jbyte *buf, jsize bufLen)) + JNIWrapper("DefineClass"); + + DTRACE_PROBE5(hotspot_jni, DefineClass__entry, + env, name, loaderRef, buf, bufLen); + jclass cls = NULL; + DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls); + + // 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. + symbolHandle class_name; + if (name != NULL) { + const int str_len = (int)strlen(name); + if (str_len > symbolOopDesc::max_length()) { + // It's impossible to create this class; the name cannot fit + // into the constant pool. + THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); + } + class_name = oopFactory::new_symbol_handle(name, str_len, CHECK_NULL); + } + + ResourceMark rm(THREAD); + ClassFileStream st((u1*) buf, bufLen, NULL); + Handle class_loader (THREAD, JNIHandles::resolve(loaderRef)); + + if (UsePerfData && !class_loader.is_null()) { + // check whether the current caller thread holds the lock or not. + // If not, increment the corresponding counter + if (ObjectSynchronizer:: + query_lock_ownership((JavaThread*)THREAD, class_loader) != + ObjectSynchronizer::owner_self) { + ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc(); + } + } + klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader, + Handle(), &st, CHECK_NULL); + + cls = (jclass)JNIHandles::make_local( + env, Klass::cast(k)->java_mirror()); + return cls; +JNI_END + + + +static bool first_time_FindClass = true; + +DT_RETURN_MARK_DECL(FindClass, jclass); + +JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name)) + JNIWrapper("FindClass"); + DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name); + + jclass result = NULL; + DT_RETURN_MARK(FindClass, jclass, (const jclass&)result); + + // Remember if we are the first invocation of jni_FindClass + bool first_time = first_time_FindClass; + first_time_FindClass = false; + + // Sanity check the name: it cannot be null or larger than the maximum size + // name we can fit in the constant pool. + if (name == NULL || (int)strlen(name) > symbolOopDesc::max_length()) { + THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name); + } + + //%note jni_3 + Handle loader; + Handle protection_domain; + // Find calling class + instanceKlassHandle k (THREAD, thread->security_get_caller_class(0)); + if (k.not_null()) { + loader = Handle(THREAD, k->class_loader()); + // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed + // in the correct class context. + if (loader.is_null() && + k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) { + JavaValue result(T_OBJECT); + JavaCalls::call_static(&result, k, + vmSymbolHandles::getFromClass_name(), + vmSymbolHandles::void_class_signature(), + thread); + if (HAS_PENDING_EXCEPTION) { + Handle ex(thread, thread->pending_exception()); + CLEAR_PENDING_EXCEPTION; + THROW_HANDLE_0(ex); + } + oop mirror = (oop) result.get_jobject(); + loader = Handle(THREAD, + instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader()); + protection_domain = Handle(THREAD, + instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain()); + } + } else { + // We call ClassLoader.getSystemClassLoader to obtain the system class loader. + loader = Handle(THREAD, SystemDictionary::java_system_loader()); + } + + symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL); + result = find_class_from_class_loader(env, sym, true, loader, + protection_domain, true, thread); + + // If we were the first invocation of jni_FindClass, we enable compilation again + // rather than just allowing invocation counter to overflow and decay. + // Controlled by flag DelayCompilationDuringStartup. + if (first_time && !CompileTheWorld) + CompilationPolicy::completed_vm_startup(); + + return result; +JNI_END + +DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID); + +JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method)) + JNIWrapper("FromReflectedMethod"); + DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method); + jmethodID ret = NULL; + DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret); + + // method is a handle to a java.lang.reflect.Method object + 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); + } + klassOop k = java_lang_Class::as_klassOop(mirror); + + KlassHandle k1(THREAD, k); + // Make sure class is initialized before handing id's out to methods + Klass::cast(k1())->initialize(CHECK_NULL); + methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot); + ret = m==NULL? NULL : m->jmethod_id(); // return NULL if reflected method deleted + return ret; +JNI_END + +DT_RETURN_MARK_DECL(FromReflectedField, jfieldID); + +JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field)) + JNIWrapper("FromReflectedField"); + DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field); + jfieldID ret = NULL; + DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret); + + // field is a handle to a java.lang.reflect.Field object + oop reflected = JNIHandles::resolve_non_null(field); + oop mirror = java_lang_reflect_Field::clazz(reflected); + klassOop k = java_lang_Class::as_klassOop(mirror); + int slot = java_lang_reflect_Field::slot(reflected); + int modifiers = java_lang_reflect_Field::modifiers(reflected); + + KlassHandle k1(THREAD, k); + // Make sure class is initialized before handing id's out to fields + Klass::cast(k1())->initialize(CHECK_NULL); + + // First check if this is a static field + if (modifiers & JVM_ACC_STATIC) { + intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot ); + JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset); + assert(id != NULL, "corrupt Field object"); + debug_only(id->set_is_static_field_id();) + // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop + ret = jfieldIDWorkaround::to_static_jfieldID(id); + return ret; + } + + // The slot is the index of the field description in the field-array + // The jfieldID is the offset of the field within the object + // It may also have hash bits for k, if VerifyJNIFields is turned on. + intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot ); + assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object"); + ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset); + return ret; +JNI_END + +DT_RETURN_MARK_DECL(ToReflectedMethod, jobject); + +JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic)) + JNIWrapper("ToReflectedMethod"); + DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic); + jobject ret = NULL; + DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret); + + methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id)); + assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match"); + oop reflection_method; + if (m->is_initializer()) { + reflection_method = Reflection::new_constructor(m, CHECK_NULL); + } else { + reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL); + } + ret = JNIHandles::make_local(env, reflection_method); + return ret; +JNI_END + +DT_RETURN_MARK_DECL(GetSuperclass, jclass); + +JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub)) + JNIWrapper("GetSuperclass"); + DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub); + jclass obj = NULL; + DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj); + + oop mirror = JNIHandles::resolve_non_null(sub); + // primitive classes return NULL + if (java_lang_Class::is_primitive(mirror)) return NULL; + + // Rules of Class.getSuperClass as implemented by KLass::java_super: + // arrays return Object + // interfaces return NULL + // proper classes return Klass::super() + klassOop k = java_lang_Class::as_klassOop(mirror); + if (Klass::cast(k)->is_interface()) return NULL; + + // return mirror for superclass + klassOop super = Klass::cast(k)->java_super(); + // super2 is the value computed by the compiler's getSuperClass intrinsic: + debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray() + ? SystemDictionary::object_klass() + : Klass::cast(k)->super() ) ); + assert(super == super2, + "java_super computation depends on interface, array, other super"); + obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror()); + return obj; +JNI_END + +JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super)) + JNIWrapper("IsSubclassOf"); + DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super); + oop sub_mirror = JNIHandles::resolve_non_null(sub); + oop super_mirror = JNIHandles::resolve_non_null(super); + if (java_lang_Class::is_primitive(sub_mirror) || + java_lang_Class::is_primitive(super_mirror)) { + jboolean ret = (sub_mirror == super_mirror); + DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret); + return ret; + } + klassOop sub_klass = java_lang_Class::as_klassOop(sub_mirror); + klassOop super_klass = java_lang_Class::as_klassOop(super_mirror); + assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom"); + jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ? + JNI_TRUE : JNI_FALSE; + DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret); + return ret; +JNI_END + +DT_RETURN_MARK_DECL(Throw, jint); + +JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj)) + JNIWrapper("Throw"); + DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj); + jint ret = JNI_OK; + DT_RETURN_MARK(Throw, jint, (const jint&)ret); + + THROW_OOP_(JNIHandles::resolve(obj), JNI_OK); + ShouldNotReachHere(); +JNI_END + +DT_RETURN_MARK_DECL(ThrowNew, jint); + +JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message)) + JNIWrapper("ThrowNew"); + DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message); + jint ret = JNI_OK; + DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret); + + instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); + symbolHandle name = symbolHandle(THREAD, k->name()); + Handle class_loader (THREAD, k->class_loader()); + Handle protection_domain (THREAD, k->protection_domain()); + THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK); + ShouldNotReachHere(); +JNI_END + + +// JNI functions only transform a pending async exception to a synchronous +// exception in ExceptionOccurred and ExceptionCheck calls, since +// delivering an async exception in other places won't change the native +// code's control flow and would be harmful when native code further calls +// JNI functions with a pending exception. Async exception is also checked +// during the call, so ExceptionOccurred/ExceptionCheck won't return +// false but deliver the async exception at the very end during +// state transition. + +static void jni_check_async_exceptions(JavaThread *thread) { + assert(thread == Thread::current(), "must be itself"); + thread->check_and_handle_async_exceptions(); +} + +JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env)) + JNIWrapper("ExceptionOccurred"); + DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env); + jni_check_async_exceptions(thread); + oop exception = thread->pending_exception(); + jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception); + DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret); + return ret; +JNI_END + + +JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env)) + JNIWrapper("ExceptionDescribe"); + DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env); + if (thread->has_pending_exception()) { + Handle ex(thread, thread->pending_exception()); + thread->clear_pending_exception(); + if (ex->is_a(SystemDictionary::threaddeath_klass())) { + // Don't print anything if we are being killed. + } else { + jio_fprintf(defaultStream::error_stream(), "Exception "); + if (thread != NULL && thread->threadObj() != NULL) { + ResourceMark rm(THREAD); + jio_fprintf(defaultStream::error_stream(), + "in thread \"%s\" ", thread->get_thread_name()); + } + if (ex->is_a(SystemDictionary::throwable_klass())) { + JavaValue result(T_VOID); + JavaCalls::call_virtual(&result, + ex, + KlassHandle(THREAD, + SystemDictionary::throwable_klass()), + vmSymbolHandles::printStackTrace_name(), + vmSymbolHandles::void_method_signature(), + THREAD); + // If an exception is thrown in the call it gets thrown away. Not much + // we can do with it. The native code that calls this, does not check + // for the exception - hence, it might still be in the thread when DestroyVM gets + // called, potentially causing a few asserts to trigger - since no pending exception + // is expected. + CLEAR_PENDING_EXCEPTION; + } else { + ResourceMark rm(THREAD); + jio_fprintf(defaultStream::error_stream(), + ". Uncaught exception of type %s.", + Klass::cast(ex->klass())->external_name()); + } + } + } + DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return); +JNI_END + + +JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env)) + JNIWrapper("ExceptionClear"); + DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env); + + // The jni code might be using this API to clear java thrown exception. + // So just mark jvmti thread exception state as exception caught. + JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state(); + if (state != NULL && state->is_exception_detected()) { + state->set_exception_caught(); + } + thread->clear_pending_exception(); + DTRACE_PROBE(hotspot_jni, ExceptionClear__return); +JNI_END + + +JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg)) + JNIWrapper("FatalError"); + DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg); + tty->print_cr("FATAL ERROR in native method: %s", msg); + thread->print_stack(); + os::abort(false); // Prevent core dump, causes a jck failure. +JNI_END + + +JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity)) + JNIWrapper("PushLocalFrame"); + DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity); + //%note jni_11 + if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) { + DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR); + return JNI_ERR; + } + JNIHandleBlock* old_handles = thread->active_handles(); + JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread); + assert(new_handles != NULL, "should not be NULL"); + new_handles->set_pop_frame_link(old_handles); + thread->set_active_handles(new_handles); + jint ret = JNI_OK; + DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret); + return ret; +JNI_END + + +JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result)) + JNIWrapper("PopLocalFrame"); + DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result); + //%note jni_11 + Handle result_handle(thread, JNIHandles::resolve(result)); + JNIHandleBlock* old_handles = thread->active_handles(); + JNIHandleBlock* new_handles = old_handles->pop_frame_link(); + if (new_handles != NULL) { + // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL. + // This way code will still work if PopLocalFrame is called without a corresponding + // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise + // the release_block call will release the blocks. + thread->set_active_handles(new_handles); + old_handles->set_pop_frame_link(NULL); // clear link we won't release new_handles below + JNIHandleBlock::release_block(old_handles, thread); // may block + result = JNIHandles::make_local(thread, result_handle()); + } + DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result); + return result; +JNI_END + + +JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref)) + JNIWrapper("NewGlobalRef"); + DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref); + Handle ref_handle(thread, JNIHandles::resolve(ref)); + jobject ret = JNIHandles::make_global(ref_handle); + DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret); + return ret; +JNI_END + +// Must be JNI_ENTRY (with HandleMark) +JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref)) + JNIWrapper("DeleteGlobalRef"); + DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref); + JNIHandles::destroy_global(ref); + DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return); +JNI_END + +JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj)) + JNIWrapper("DeleteLocalRef"); + DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj); + JNIHandles::destroy_local(obj); + DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return); +JNI_END + +JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2)) + JNIWrapper("IsSameObject"); + DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2); + oop a = JNIHandles::resolve(r1); + oop b = JNIHandles::resolve(r2); + jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE; + DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret); + return ret; +JNI_END + + +JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref)) + JNIWrapper("NewLocalRef"); + DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref); + jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref)); + DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret); + return ret; +JNI_END + +JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity)) + JNIWrapper("EnsureLocalCapacity"); + DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity); + jint ret; + if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) { + ret = JNI_OK; + } else { + ret = JNI_ERR; + } + DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret); + return ret; +JNI_END + +// Return the Handle Type +JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj)) + JNIWrapper("GetObjectRefType"); + DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj); + jobjectRefType ret; + if (JNIHandles::is_local_handle(thread, obj) || + JNIHandles::is_frame_handle(thread, obj)) + ret = JNILocalRefType; + else if (JNIHandles::is_global_handle(obj)) + ret = JNIGlobalRefType; + else if (JNIHandles::is_weak_global_handle(obj)) + ret = JNIWeakGlobalRefType; + else + ret = JNIInvalidRefType; + DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret); + return ret; +JNI_END + + +class JNI_ArgumentPusher : public SignatureIterator { + protected: + JavaCallArguments* _arguments; + + virtual void get_bool () = 0; + virtual void get_char () = 0; + virtual void get_short () = 0; + virtual void get_byte () = 0; + virtual void get_int () = 0; + virtual void get_long () = 0; + virtual void get_float () = 0; + virtual void get_double () = 0; + virtual void get_object () = 0; + + JNI_ArgumentPusher(Thread *thread, symbolOop signature) + : SignatureIterator(thread, signature) { + this->_return_type = T_ILLEGAL; + _arguments = NULL; + } + + public: + virtual void iterate( uint64_t fingerprint ) = 0; + + void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; } + + inline void do_bool() { if (!is_return_type()) get_bool(); } + inline void do_char() { if (!is_return_type()) get_char(); } + inline void do_short() { if (!is_return_type()) get_short(); } + inline void do_byte() { if (!is_return_type()) get_byte(); } + inline void do_int() { if (!is_return_type()) get_int(); } + inline void do_long() { if (!is_return_type()) get_long(); } + inline void do_float() { if (!is_return_type()) get_float(); } + inline void do_double() { if (!is_return_type()) get_double(); } + inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); } + inline void do_array(int begin, int end) { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array + inline void do_void() { } + + JavaCallArguments* arguments() { return _arguments; } + void push_receiver(Handle h) { _arguments->push_oop(h); } +}; + + +class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher { + protected: + va_list _ap; + + inline void get_bool() { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg + inline void get_char() { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg + inline void get_short() { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg + inline void get_byte() { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg + inline void get_int() { _arguments->push_int(va_arg(_ap, jint)); } + + // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests + + inline void get_long() { _arguments->push_long(va_arg(_ap, jlong)); } + inline void get_float() { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg + inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); } + inline void get_object() { jobject l = va_arg(_ap, jobject); + _arguments->push_oop(Handle((oop *)l, false)); } + + inline void set_ap(va_list rap) { +#ifdef va_copy + va_copy(_ap, rap); +#elif defined (__va_copy) + __va_copy(_ap, rap); +#else + _ap = rap; +#endif + } + + public: + JNI_ArgumentPusherVaArg(Thread *thread, symbolOop signature, va_list rap) + : JNI_ArgumentPusher(thread, signature) { + set_ap(rap); + } + JNI_ArgumentPusherVaArg(Thread *thread, jmethodID method_id, va_list rap) + : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) { + set_ap(rap); + } + + // Optimized path if we have the bitvector form of signature + void iterate( uint64_t fingerprint ) { + if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments + else { + _return_type = (BasicType)((fingerprint >> static_feature_size) & + result_feature_mask); + + assert(fingerprint, "Fingerprint should not be 0"); + fingerprint = fingerprint >> (static_feature_size + result_feature_size); + while ( 1 ) { + switch ( fingerprint & parameter_feature_mask ) { + case bool_parm: + case char_parm: + case short_parm: + case byte_parm: + case int_parm: + get_int(); + break; + case obj_parm: + get_object(); + break; + case long_parm: + get_long(); + break; + case float_parm: + get_float(); + break; + case double_parm: + get_double(); + break; + case done_parm: + return; + break; + default: + ShouldNotReachHere(); + break; + } + fingerprint >>= parameter_feature_size; + } + } + } +}; + + +class JNI_ArgumentPusherArray : public JNI_ArgumentPusher { + protected: + const jvalue *_ap; + + inline void get_bool() { _arguments->push_int((jint)(_ap++)->z); } + inline void get_char() { _arguments->push_int((jint)(_ap++)->c); } + inline void get_short() { _arguments->push_int((jint)(_ap++)->s); } + inline void get_byte() { _arguments->push_int((jint)(_ap++)->b); } + inline void get_int() { _arguments->push_int((jint)(_ap++)->i); } + + inline void get_long() { _arguments->push_long((_ap++)->j); } + inline void get_float() { _arguments->push_float((_ap++)->f); } + inline void get_double() { _arguments->push_double((_ap++)->d);} + inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); } + + inline void set_ap(const jvalue *rap) { _ap = rap; } + + public: + JNI_ArgumentPusherArray(Thread *thread, symbolOop signature, const jvalue *rap) + : JNI_ArgumentPusher(thread, signature) { + set_ap(rap); + } + JNI_ArgumentPusherArray(Thread *thread, jmethodID method_id, const jvalue *rap) + : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) { + set_ap(rap); + } + + // Optimized path if we have the bitvector form of signature + void iterate( uint64_t fingerprint ) { + if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments + else { + _return_type = (BasicType)((fingerprint >> static_feature_size) & + result_feature_mask); + assert(fingerprint, "Fingerprint should not be 0"); + fingerprint = fingerprint >> (static_feature_size + result_feature_size); + while ( 1 ) { + switch ( fingerprint & parameter_feature_mask ) { + case bool_parm: + get_bool(); + break; + case char_parm: + get_char(); + break; + case short_parm: + get_short(); + break; + case byte_parm: + get_byte(); + break; + case int_parm: + get_int(); + break; + case obj_parm: + get_object(); + break; + case long_parm: + get_long(); + break; + case float_parm: + get_float(); + break; + case double_parm: + get_double(); + break; + case done_parm: + return; + break; + default: + ShouldNotReachHere(); + break; + } + fingerprint >>= parameter_feature_size; + } + } + } +}; + + +enum JNICallType { + JNI_STATIC, + JNI_VIRTUAL, + JNI_NONVIRTUAL +}; + +static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) { + assert(!method.is_null() , "method should not be null"); + + KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc) + if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass()); + KlassHandle spec_klass (THREAD, method->method_holder()); + symbolHandle name (THREAD, method->name()); + symbolHandle signature (THREAD, method->signature()); + CallInfo info; + LinkResolver::resolve_interface_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle())); + return info.selected_method(); +} + +static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) { + assert(!method.is_null() , "method should not be null"); + + KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc) + if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass()); + KlassHandle spec_klass (THREAD, method->method_holder()); + symbolHandle name (THREAD, method->name()); + symbolHandle signature (THREAD, method->signature()); + CallInfo info; + LinkResolver::resolve_virtual_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle())); + return info.selected_method(); +} + + + +static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) { + methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id)); + + // Create object to hold arguments for the JavaCall, and associate it with + // the jni parser + ResourceMark rm(THREAD); + int number_of_parameters = method->size_of_parameters(); + JavaCallArguments java_args(number_of_parameters); + args->set_java_argument_object(&java_args); + + assert(method->is_static(), "method should be static"); + + // Fill out JavaCallArguments object + args->iterate( Fingerprinter(THREAD, method).fingerprint() ); + // Initialize result type + result->set_type(args->get_ret_type()); + + // Invoke the method. Result is returned as oop. + JavaCalls::call(result, method, &java_args, CHECK); + + // Convert result + if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) { + result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject())); + } +} + + +static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) { + oop recv = JNIHandles::resolve(receiver); + if (recv == NULL) { + THROW(vmSymbols::java_lang_NullPointerException()); + } + Handle h_recv(THREAD, recv); + + int number_of_parameters; + methodOop selected_method; + { + methodOop m = JNIHandles::resolve_jmethod_id(method_id); + number_of_parameters = m->size_of_parameters(); + klassOop holder = m->method_holder(); + if (!(Klass::cast(holder))->is_interface()) { + // non-interface call -- for that little speed boost, don't handlize + debug_only(No_Safepoint_Verifier nosafepoint;) + if (call_type == JNI_VIRTUAL) { + // jni_GetMethodID makes sure class is linked and initialized + // so m should have a valid vtable index. + int vtbl_index = m->vtable_index(); + if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) { + klassOop k = h_recv->klass(); + // k might be an arrayKlassOop but all vtables start at + // the same place. The cast is to avoid virtual call and assertion. + instanceKlass *ik = (instanceKlass*)k->klass_part(); + selected_method = ik->method_at_vtable(vtbl_index); + } else { + // final method + selected_method = m; + } + } else { + // JNI_NONVIRTUAL call + selected_method = m; + } + } else { + // interface call + KlassHandle h_holder(THREAD, holder); + + int itbl_index = m->cached_itable_index(); + if (itbl_index == -1) { + itbl_index = klassItable::compute_itable_index(m); + m->set_cached_itable_index(itbl_index); + // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again + } + klassOop k = h_recv->klass(); + selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK); + } + } + + methodHandle method(THREAD, selected_method); + + // Create object to hold arguments for the JavaCall, and associate it with + // the jni parser + ResourceMark rm(THREAD); + JavaCallArguments java_args(number_of_parameters); + args->set_java_argument_object(&java_args); + + // handle arguments + assert(!method->is_static(), "method should not be static"); + args->push_receiver(h_recv); // Push jobject handle + + // Fill out JavaCallArguments object + args->iterate( Fingerprinter(THREAD, method).fingerprint() ); + // Initialize result type + result->set_type(args->get_ret_type()); + + // Invoke the method. Result is returned as oop. + JavaCalls::call(result, method, &java_args, CHECK); + + // Convert result + if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) { + result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject())); + } +} + + +static instanceOop alloc_object(jclass clazz, TRAPS) { + KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); + Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL); + instanceKlass::cast(k())->initialize(CHECK_NULL); + instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD); + return ih; +} + +DT_RETURN_MARK_DECL(AllocObject, jobject); + +JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz)) + JNIWrapper("AllocObject"); + + DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz); + jobject ret = NULL; + DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret); + + instanceOop i = alloc_object(clazz, CHECK_NULL); + ret = JNIHandles::make_local(env, i); + return ret; +JNI_END + +DT_RETURN_MARK_DECL(NewObjectA, jobject); + +JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args)) + JNIWrapper("NewObjectA"); + DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID); + jobject obj = NULL; + DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj); + + instanceOop i = alloc_object(clazz, CHECK_NULL); + obj = JNIHandles::make_local(env, i); + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherArray ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL); + return obj; +JNI_END + +DT_RETURN_MARK_DECL(NewObjectV, jobject); + +JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args)) + JNIWrapper("NewObjectV"); + DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID); + jobject obj = NULL; + DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj); + + instanceOop i = alloc_object(clazz, CHECK_NULL); + obj = JNIHandles::make_local(env, i); + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL); + return obj; +JNI_END + +DT_RETURN_MARK_DECL(NewObject, jobject); + +JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...)) + JNIWrapper("NewObject"); + DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID); + jobject obj = NULL; + DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj); + + instanceOop i = alloc_object(clazz, CHECK_NULL); + obj = JNIHandles::make_local(env, i); + va_list args; + va_start(args, methodID); + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL); + va_end(args); + return obj; +JNI_END + + +JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj)) + JNIWrapper("GetObjectClass"); + DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj); + klassOop k = JNIHandles::resolve_non_null(obj)->klass(); + jclass ret = + (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror()); + DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret); + return ret; +JNI_END + +JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz)) + JNIWrapper("IsInstanceOf"); + DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz); + jboolean ret = JNI_TRUE; + if (obj != NULL) { + ret = JNI_FALSE; + klassOop k = java_lang_Class::as_klassOop( + JNIHandles::resolve_non_null(clazz)); + if (k != NULL) { + ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE; + } + } + DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret); + return ret; +JNI_END + + +static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str, + const char *sig, bool is_static, TRAPS) { + // %%%% This code should probably just call into a method in the LinkResolver + // + // The class should have been loaded (we have an instance of the class + // passed in) so the method and signature should already be in the symbol + // table. If they're not there, the method doesn't exist. + symbolHandle signature = + symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig))); + symbolHandle name; + if (name_str == NULL) { + name = vmSymbolHandles::object_initializer_name(); + } else { + name = symbolHandle(THREAD, + SymbolTable::probe(name_str, (int)strlen(name_str))); + } + if (name.is_null() || signature.is_null()) { + THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str); + } + + // Throw a NoSuchMethodError exception if we have an instance of a + // primitive java.lang.Class + if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) { + THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str); + } + + KlassHandle klass(THREAD, + java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); + + // Make sure class is linked and initialized before handing id's out to + // methodOops. + Klass::cast(klass())->initialize(CHECK_NULL); + + methodOop m; + if (name() == vmSymbols::object_initializer_name() || + name() == vmSymbols::class_initializer_name()) { + // Never search superclasses for constructors + if (klass->oop_is_instance()) { + m = instanceKlass::cast(klass())->find_method(name(), signature()); + } else { + m = NULL; + } + } else { + m = klass->lookup_method(name(), signature()); + // Look up interfaces + if (m == NULL && klass->oop_is_instance()) { + m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name(), + signature()); + } + } + if (m == NULL || (m->is_static() != is_static)) { + THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str); + } + return m->jmethod_id(); +} + + +JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz, + const char *name, const char *sig)) + JNIWrapper("GetMethodID"); + DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig); + jmethodID ret = get_method_id(env, clazz, name, sig, false, thread); + DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret); + return ret; +JNI_END + + +JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz, + const char *name, const char *sig)) + JNIWrapper("GetStaticMethodID"); + DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig); + jmethodID ret = get_method_id(env, clazz, name, sig, true, thread); + DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret); + return ret; +JNI_END + + + +// +// Calling Methods +// + + +#define DEFINE_CALLMETHOD(ResultType, Result, Tag) \ +\ + DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\ + DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\ + DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\ +\ +JNI_ENTRY(ResultType, \ + jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \ + JNIWrapper("Call" XSTR(Result) "Method"); \ +\ + DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\ + ResultType ret = 0;\ + DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \ + (const ResultType&)ret);\ +\ + va_list args; \ + va_start(args, methodID); \ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ + jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \ + va_end(args); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END \ +\ +\ +JNI_ENTRY(ResultType, \ + jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \ + JNIWrapper("Call" XSTR(Result) "MethodV"); \ +\ + DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\ + ResultType ret = 0;\ + DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \ + (const ResultType&)ret);\ +\ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ + jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END \ +\ +\ +JNI_ENTRY(ResultType, \ + jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \ + JNIWrapper("Call" XSTR(Result) "MethodA"); \ + DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\ + ResultType ret = 0;\ + DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \ + (const ResultType&)ret);\ +\ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherArray ap(THREAD, methodID, args); \ + jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END + +// the runtime type of subword integral basic types is integer +DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN) +DEFINE_CALLMETHOD(jbyte, Byte, T_BYTE) +DEFINE_CALLMETHOD(jchar, Char, T_CHAR) +DEFINE_CALLMETHOD(jshort, Short, T_SHORT) + +DEFINE_CALLMETHOD(jobject, Object, T_OBJECT) +DEFINE_CALLMETHOD(jint, Int, T_INT) +DEFINE_CALLMETHOD(jlong, Long, T_LONG) +DEFINE_CALLMETHOD(jfloat, Float, T_FLOAT) +DEFINE_CALLMETHOD(jdouble, Double, T_DOUBLE) + +DT_VOID_RETURN_MARK_DECL(CallVoidMethod); +DT_VOID_RETURN_MARK_DECL(CallVoidMethodV); +DT_VOID_RETURN_MARK_DECL(CallVoidMethodA); + +JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...)) + JNIWrapper("CallVoidMethod"); + DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID); + DT_VOID_RETURN_MARK(CallVoidMethod); + + va_list args; + va_start(args, methodID); + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK); + va_end(args); +JNI_END + + +JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) + JNIWrapper("CallVoidMethodV"); + DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID); + DT_VOID_RETURN_MARK(CallVoidMethodV); + + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK); +JNI_END + + +JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) + JNIWrapper("CallVoidMethodA"); + DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID); + DT_VOID_RETURN_MARK(CallVoidMethodA); + + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherArray ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK); +JNI_END + + +#define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \ +\ + DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\ + DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\ + DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\ +\ +JNI_ENTRY(ResultType, \ + jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \ + JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \ +\ + DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\ + ResultType ret;\ + DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \ + (const ResultType&)ret);\ +\ + va_list args; \ + va_start(args, methodID); \ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \ + va_end(args); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END \ +\ +JNI_ENTRY(ResultType, \ + jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \ + JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \ + DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\ + ResultType ret;\ + DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \ + (const ResultType&)ret);\ +\ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END \ +\ +JNI_ENTRY(ResultType, \ + jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \ + JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \ + DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\ + ResultType ret;\ + DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \ + (const ResultType&)ret);\ +\ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherArray ap(THREAD, methodID, args); \ + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END + +// the runtime type of subword integral basic types is integer +DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN) +DEFINE_CALLNONVIRTUALMETHOD(jbyte, Byte, T_BYTE) +DEFINE_CALLNONVIRTUALMETHOD(jchar, Char, T_CHAR) +DEFINE_CALLNONVIRTUALMETHOD(jshort, Short, T_SHORT) + +DEFINE_CALLNONVIRTUALMETHOD(jobject, Object, T_OBJECT) +DEFINE_CALLNONVIRTUALMETHOD(jint, Int, T_INT) +DEFINE_CALLNONVIRTUALMETHOD(jlong, Long, T_LONG) +DEFINE_CALLNONVIRTUALMETHOD(jfloat, Float, T_FLOAT) +DEFINE_CALLNONVIRTUALMETHOD(jdouble, Double, T_DOUBLE) + + +DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod); +DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV); +DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA); + +JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) + JNIWrapper("CallNonvirtualVoidMethod"); + + DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry, + env, obj, cls, methodID); + DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod); + + va_list args; + va_start(args, methodID); + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK); + va_end(args); +JNI_END + + +JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) + JNIWrapper("CallNonvirtualVoidMethodV"); + + DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry, + env, obj, cls, methodID); + DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV); + + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK); +JNI_END + + +JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) + JNIWrapper("CallNonvirtualVoidMethodA"); + DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry, + env, obj, cls, methodID); + DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA); + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherArray ap(THREAD, methodID, args); + jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK); +JNI_END + + +#define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \ +\ + DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\ + DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\ + DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\ +\ +JNI_ENTRY(ResultType, \ + jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \ + JNIWrapper("CallStatic" XSTR(Result) "Method"); \ +\ + DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\ + ResultType ret = 0;\ + DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \ + (const ResultType&)ret);\ +\ + va_list args; \ + va_start(args, methodID); \ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ + jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \ + va_end(args); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END \ +\ +JNI_ENTRY(ResultType, \ + jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \ + JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \ + DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\ + ResultType ret = 0;\ + DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \ + (const ResultType&)ret);\ +\ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \ + jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END \ +\ +JNI_ENTRY(ResultType, \ + jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \ + JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \ + DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\ + ResultType ret = 0;\ + DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \ + (const ResultType&)ret);\ +\ + JavaValue jvalue(Tag); \ + JNI_ArgumentPusherArray ap(THREAD, methodID, args); \ + jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \ + ret = jvalue.get_##ResultType(); \ + return ret;\ +JNI_END + +// the runtime type of subword integral basic types is integer +DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN) +DEFINE_CALLSTATICMETHOD(jbyte, Byte, T_BYTE) +DEFINE_CALLSTATICMETHOD(jchar, Char, T_CHAR) +DEFINE_CALLSTATICMETHOD(jshort, Short, T_SHORT) + +DEFINE_CALLSTATICMETHOD(jobject, Object, T_OBJECT) +DEFINE_CALLSTATICMETHOD(jint, Int, T_INT) +DEFINE_CALLSTATICMETHOD(jlong, Long, T_LONG) +DEFINE_CALLSTATICMETHOD(jfloat, Float, T_FLOAT) +DEFINE_CALLSTATICMETHOD(jdouble, Double, T_DOUBLE) + + +DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod); +DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV); +DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA); + +JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...)) + JNIWrapper("CallStaticVoidMethod"); + DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID); + DT_VOID_RETURN_MARK(CallStaticVoidMethod); + + va_list args; + va_start(args, methodID); + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); + jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK); + va_end(args); +JNI_END + + +JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) + JNIWrapper("CallStaticVoidMethodV"); + DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID); + DT_VOID_RETURN_MARK(CallStaticVoidMethodV); + + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); + jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK); +JNI_END + + +JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) + JNIWrapper("CallStaticVoidMethodA"); + DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID); + DT_VOID_RETURN_MARK(CallStaticVoidMethodA); + + JavaValue jvalue(T_VOID); + JNI_ArgumentPusherArray ap(THREAD, methodID, args); + jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK); +JNI_END + + +// +// Accessing Fields +// + + +DT_RETURN_MARK_DECL(GetFieldID, jfieldID); + +JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz, + const char *name, const char *sig)) + JNIWrapper("GetFieldID"); + DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig); + jfieldID ret = 0; + DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret); + + // The class should have been loaded (we have an instance of the class + // passed in) so the field and signature should already be in the symbol + // table. If they're not there, the field doesn't exist. + symbolHandle fieldname = + symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name))); + symbolHandle signame = + symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig))); + if (fieldname.is_null() || signame.is_null()) { + THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name); + } + KlassHandle k(THREAD, + java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); + // Make sure class is initialized before handing id's out to fields + Klass::cast(k())->initialize(CHECK_NULL); + + fieldDescriptor fd; + if (!Klass::cast(k())->oop_is_instance() || + !instanceKlass::cast(k())->find_field(fieldname(), signame(), false, &fd)) { + THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name); + } + + // A jfieldID for a non-static field is simply the offset of the field within the instanceOop + // It may also have hash bits for k, if VerifyJNIFields is turned on. + ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset()); + return ret; +JNI_END + + +JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID)) + JNIWrapper("GetObjectField"); + DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID); + oop o = JNIHandles::resolve_non_null(obj); + klassOop k = o->klass(); + int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); + // Keep JVMTI addition small and only check enabled flag here. + // jni_GetField_probe() assumes that is okay to create handles. + if (JvmtiExport::should_post_field_access()) { + o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false); + } + jobject ret = JNIHandles::make_local(env, o->obj_field(offset)); + DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret); + return ret; +JNI_END + + +#define DEFINE_GETFIELD(Return,Fieldname,Result) \ +\ + DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\ +\ +JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \ + JNIWrapper("Get" XSTR(Result) "Field"); \ +\ + DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\ + Return ret = 0;\ + DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\ +\ + oop o = JNIHandles::resolve_non_null(obj); \ + klassOop k = o->klass(); \ + int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \ + /* Keep JVMTI addition small and only check enabled flag here. */ \ + /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \ + /* and creates a ResetNoHandleMark. */ \ + if (JvmtiExport::should_post_field_access()) { \ + o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \ + } \ + ret = o->Fieldname##_field(offset); \ + return ret; \ +JNI_END + +DEFINE_GETFIELD(jboolean, bool, Boolean) +DEFINE_GETFIELD(jbyte, byte, Byte) +DEFINE_GETFIELD(jchar, char, Char) +DEFINE_GETFIELD(jshort, short, Short) +DEFINE_GETFIELD(jint, int, Int) +DEFINE_GETFIELD(jlong, long, Long) +DEFINE_GETFIELD(jfloat, float, Float) +DEFINE_GETFIELD(jdouble, double, Double) + +address jni_GetBooleanField_addr() { + return (address)jni_GetBooleanField; +} +address jni_GetByteField_addr() { + return (address)jni_GetByteField; +} +address jni_GetCharField_addr() { + return (address)jni_GetCharField; +} +address jni_GetShortField_addr() { + return (address)jni_GetShortField; +} +address jni_GetIntField_addr() { + return (address)jni_GetIntField; +} +address jni_GetLongField_addr() { + return (address)jni_GetLongField; +} +address jni_GetFloatField_addr() { + return (address)jni_GetFloatField; +} +address jni_GetDoubleField_addr() { + return (address)jni_GetDoubleField; +} + +JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value)) + JNIWrapper("SetObjectField"); + DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value); + oop o = JNIHandles::resolve_non_null(obj); + klassOop k = o->klass(); + int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); + // Keep JVMTI addition small and only check enabled flag here. + // jni_SetField_probe_nh() assumes that is not okay to create handles + // and creates a ResetNoHandleMark. + if (JvmtiExport::should_post_field_modification()) { + jvalue field_value; + field_value.l = value; + o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value); + } + o->obj_field_put(offset, JNIHandles::resolve(value)); + DTRACE_PROBE(hotspot_jni, SetObjectField__return); +JNI_END + +#define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \ +\ +JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \ + JNIWrapper("Set" XSTR(Result) "Field"); \ +\ + HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \ + ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \ + HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \ + ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \ +\ + oop o = JNIHandles::resolve_non_null(obj); \ + klassOop k = o->klass(); \ + int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \ + /* Keep JVMTI addition small and only check enabled flag here. */ \ + /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \ + /* and creates a ResetNoHandleMark. */ \ + if (JvmtiExport::should_post_field_modification()) { \ + jvalue field_value; \ + field_value.unionType = value; \ + o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \ + } \ + o->Fieldname##_field_put(offset, value); \ + DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\ +JNI_END + +DEFINE_SETFIELD(jboolean, bool, Boolean, 'Z', z) +DEFINE_SETFIELD(jbyte, byte, Byte, 'B', b) +DEFINE_SETFIELD(jchar, char, Char, 'C', c) +DEFINE_SETFIELD(jshort, short, Short, 'S', s) +DEFINE_SETFIELD(jint, int, Int, 'I', i) +DEFINE_SETFIELD(jlong, long, Long, 'J', j) +DEFINE_SETFIELD(jfloat, float, Float, 'F', f) +DEFINE_SETFIELD(jdouble, double, Double, 'D', d) + +DT_RETURN_MARK_DECL(ToReflectedField, jobject); + +JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic)) + JNIWrapper("ToReflectedField"); + DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry, + env, cls, fieldID, isStatic); + jobject ret = NULL; + DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret); + + fieldDescriptor fd; + bool found = false; + klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls)); + + assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID"); + + if (isStatic) { + // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop. + JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); + assert(id->is_static_field_id(), "invalid static field id"); + found = instanceKlass::cast(id->holder())->find_local_field_from_offset(id->offset(), true, &fd); + } else { + // Non-static field. The fieldID is really the offset of the field within the instanceOop. + int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); + found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd); + } + assert(found, "bad fieldID passed into jni_ToReflectedField"); + oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL); + ret = JNIHandles::make_local(env, reflected); + return ret; +JNI_END + + +// +// Accessing Static Fields +// +DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID); + +JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz, + const char *name, const char *sig)) + JNIWrapper("GetStaticFieldID"); + DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig); + jfieldID ret = NULL; + DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret); + + // The class should have been loaded (we have an instance of the class + // passed in) so the field and signature should already be in the symbol + // table. If they're not there, the field doesn't exist. + symbolHandle fieldname = + symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name))); + symbolHandle signame = + symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig))); + if (fieldname.is_null() || signame.is_null()) { + THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name); + } + KlassHandle k(THREAD, + java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); + // Make sure class is initialized before handing id's out to static fields + Klass::cast(k())->initialize(CHECK_NULL); + + fieldDescriptor fd; + if (!Klass::cast(k())->oop_is_instance() || + !instanceKlass::cast(k())->find_field(fieldname(), signame(), true, &fd)) { + THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name); + } + + // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop + JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset()); + debug_only(id->set_is_static_field_id();) + + debug_only(int first_offset = instanceKlass::cast(fd.field_holder())->offset_of_static_fields();) + debug_only(int end_offset = first_offset + (instanceKlass::cast(fd.field_holder())->static_field_size() * wordSize);) + assert(id->offset() >= first_offset && id->offset() < end_offset, "invalid static field offset"); + + ret = jfieldIDWorkaround::to_static_jfieldID(id); + return ret; +JNI_END + + +JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID)) + JNIWrapper("GetStaticObjectField"); + DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID); +#ifndef JNICHECK_KERNEL + DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);) +#endif // JNICHECK_KERNEL + JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); + assert(id->is_static_field_id(), "invalid static field id"); + // Keep JVMTI addition small and only check enabled flag here. + // jni_GetField_probe() assumes that is okay to create handles. + if (JvmtiExport::should_post_field_access()) { + JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); + } + jobject ret = JNIHandles::make_local(id->holder()->obj_field(id->offset())); + DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret); + return ret; +JNI_END + +#define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \ +\ + DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\ +\ +JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \ + JNIWrapper("GetStatic" XSTR(Result) "Field"); \ + DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\ + Return ret = 0;\ + DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \ + (const Return&)ret);\ + JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \ + assert(id->is_static_field_id(), "invalid static field id"); \ + /* Keep JVMTI addition small and only check enabled flag here. */ \ + /* jni_GetField_probe() assumes that is okay to create handles. */ \ + if (JvmtiExport::should_post_field_access()) { \ + JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \ + } \ + ret = id->holder()-> Fieldname##_field (id->offset()); \ + return ret;\ +JNI_END + +DEFINE_GETSTATICFIELD(jboolean, bool, Boolean) +DEFINE_GETSTATICFIELD(jbyte, byte, Byte) +DEFINE_GETSTATICFIELD(jchar, char, Char) +DEFINE_GETSTATICFIELD(jshort, short, Short) +DEFINE_GETSTATICFIELD(jint, int, Int) +DEFINE_GETSTATICFIELD(jlong, long, Long) +DEFINE_GETSTATICFIELD(jfloat, float, Float) +DEFINE_GETSTATICFIELD(jdouble, double, Double) + + +JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value)) + JNIWrapper("SetStaticObjectField"); + DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value); + JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); + assert(id->is_static_field_id(), "invalid static field id"); + // Keep JVMTI addition small and only check enabled flag here. + // jni_SetField_probe() assumes that is okay to create handles. + if (JvmtiExport::should_post_field_modification()) { + jvalue field_value; + field_value.l = value; + JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value); + } + id->holder()->obj_field_put(id->offset(), JNIHandles::resolve(value)); + DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return); +JNI_END + + +#define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \ +\ +JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \ + JNIWrapper("SetStatic" XSTR(Result) "Field"); \ + HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\ + ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \ + HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \ + ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \ +\ + JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \ + assert(id->is_static_field_id(), "invalid static field id"); \ + /* Keep JVMTI addition small and only check enabled flag here. */ \ + /* jni_SetField_probe() assumes that is okay to create handles. */ \ + if (JvmtiExport::should_post_field_modification()) { \ + jvalue field_value; \ + field_value.unionType = value; \ + JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \ + } \ + id->holder()-> Fieldname##_field_put (id->offset(), value); \ + DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\ +JNI_END + +DEFINE_SETSTATICFIELD(jboolean, bool, Boolean, 'Z', z) +DEFINE_SETSTATICFIELD(jbyte, byte, Byte, 'B', b) +DEFINE_SETSTATICFIELD(jchar, char, Char, 'C', c) +DEFINE_SETSTATICFIELD(jshort, short, Short, 'S', s) +DEFINE_SETSTATICFIELD(jint, int, Int, 'I', i) +DEFINE_SETSTATICFIELD(jlong, long, Long, 'J', j) +DEFINE_SETSTATICFIELD(jfloat, float, Float, 'F', f) +DEFINE_SETSTATICFIELD(jdouble, double, Double, 'D', d) + + +// +// String Operations +// + +// Unicode Interface + +DT_RETURN_MARK_DECL(NewString, jstring); + +JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len)) + JNIWrapper("NewString"); + DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len); + jstring ret = NULL; + DT_RETURN_MARK(NewString, jstring, (const jstring&)ret); + oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL); + ret = (jstring) JNIHandles::make_local(env, string); + return ret; +JNI_END + + +JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string)) + JNIWrapper("GetStringLength"); + DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string); + jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string)); + DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret); + return ret; +JNI_END + + +JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars( + JNIEnv *env, jstring string, jboolean *isCopy)) + JNIWrapper("GetStringChars"); + DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy); + //%note jni_5 + if (isCopy != NULL) { + *isCopy = JNI_TRUE; + } + oop s = JNIHandles::resolve_non_null(string); + int s_len = java_lang_String::length(s); + typeArrayOop s_value = java_lang_String::value(s); + int s_offset = java_lang_String::offset(s); + jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1); // add one for zero termination + if (s_len > 0) { + memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len); + } + buf[s_len] = 0; + DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf); + return buf; +JNI_END + + +JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars)) + JNIWrapper("ReleaseStringChars"); + DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars); + //%note jni_6 + if (chars != NULL) { + // Since String objects are supposed to be immutable, don't copy any + // new data back. A bad user will have to go after the char array. + FreeHeap((void*) chars); + } + DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return); +JNI_END + + +// UTF Interface + +DT_RETURN_MARK_DECL(NewStringUTF, jstring); + +JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes)) + JNIWrapper("NewStringUTF"); + DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes); + jstring ret; + DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret); + + oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL); + ret = (jstring) JNIHandles::make_local(env, result); + return ret; +JNI_END + + +JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string)) + JNIWrapper("GetStringUTFLength"); + DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string); + jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string)); + DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret); + return ret; +JNI_END + + +JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy)) + JNIWrapper("GetStringUTFChars"); + DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy); + ResourceMark rm; + char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(string)); + int length = (int)strlen(str); + char* result = AllocateHeap(length+1, "GetStringUTFChars"); + strcpy(result, str); + if (isCopy != NULL) *isCopy = JNI_TRUE; + DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result); + return result; +JNI_END + + +JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars)) + JNIWrapper("ReleaseStringUTFChars"); + DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars); + if (chars != NULL) { + FreeHeap((char*) chars); + } + DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return); +JNI_END + + +JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array)) + JNIWrapper("GetArrayLength"); + DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array); + arrayOop a = arrayOop(JNIHandles::resolve_non_null(array)); + assert(a->is_array(), "must be array"); + jsize ret = a->length(); + DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret); + return ret; +JNI_END + + +// +// Object Array Operations +// + +DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray); + +JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement)) + JNIWrapper("NewObjectArray"); + DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement); + jobjectArray ret = NULL; + DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret); + KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass))); + klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL); + KlassHandle ak = KlassHandle(THREAD, ako); + objArrayKlass::cast(ak())->initialize(CHECK_NULL); + objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL); + oop initial_value = JNIHandles::resolve(initialElement); + if (initial_value != NULL) { // array already initialized with NULL + for (int index = 0; index < length; index++) { + result->obj_at_put(index, initial_value); + } + } + ret = (jobjectArray) JNIHandles::make_local(env, result); + return ret; +JNI_END + +DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject); + +JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index)) + JNIWrapper("GetObjectArrayElement"); + DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index); + jobject ret = NULL; + DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret); + objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array)); + if (a->is_within_bounds(index)) { + jobject ret = JNIHandles::make_local(env, a->obj_at(index)); + return ret; + } else { + char buf[jintAsStringSize]; + sprintf(buf, "%d", index); + THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf); + } +JNI_END + +DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement); + +JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value)) + JNIWrapper("SetObjectArrayElement"); + DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value); + DT_VOID_RETURN_MARK(SetObjectArrayElement); + + objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array)); + oop v = JNIHandles::resolve(value); + if (a->is_within_bounds(index)) { + if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) { + a->obj_at_put(index, v); + } else { + THROW(vmSymbols::java_lang_ArrayStoreException()); + } + } else { + char buf[jintAsStringSize]; + sprintf(buf, "%d", index); + THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf); + } +JNI_END + + +#define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \ +\ + DT_RETURN_MARK_DECL_FOR(Result, New##Result##Array, Return);\ +\ +JNI_ENTRY(Return, \ + jni_New##Result##Array(JNIEnv *env, jsize len)) \ + JNIWrapper("New" XSTR(Result) "Array"); \ + DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\ + Return ret = NULL;\ + DT_RETURN_MARK_FOR(Result, New##Result##Array, Return, (const Return&)ret);\ +\ + oop obj= oopFactory::Allocator(len, CHECK_0); \ + ret = (Return) JNIHandles::make_local(env, obj); \ + return ret;\ +JNI_END + +DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray, Boolean) +DEFINE_NEWSCALARARRAY(jbyteArray, new_byteArray, Byte) +DEFINE_NEWSCALARARRAY(jshortArray, new_shortArray, Short) +DEFINE_NEWSCALARARRAY(jcharArray, new_charArray, Char) +DEFINE_NEWSCALARARRAY(jintArray, new_intArray, Int) +DEFINE_NEWSCALARARRAY(jlongArray, new_longArray, Long) +DEFINE_NEWSCALARARRAY(jfloatArray, new_singleArray, Float) +DEFINE_NEWSCALARARRAY(jdoubleArray, new_doubleArray, Double) + + +// Return an address which will fault if the caller writes to it. + +static char* get_bad_address() { + static char* bad_address = NULL; + if (bad_address == NULL) { + size_t size = os::vm_allocation_granularity(); + bad_address = os::reserve_memory(size); + if (bad_address != NULL) { + os::commit_memory(bad_address, size); + os::protect_memory(bad_address, size); + } + } + return bad_address; +} + + +#define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \ +\ +JNI_QUICK_ENTRY(ElementType*, \ + jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \ + JNIWrapper("Get" XSTR(Result) "ArrayElements"); \ + DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\ + /* allocate an chunk of memory in c land */ \ + typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \ + ElementType* result; \ + int len = a->length(); \ + if (len == 0) { \ + /* Empty array: legal but useless, can't return NULL. \ + * Return a pointer to something useless. \ + * Avoid asserts in typeArrayOop. */ \ + result = (ElementType*)get_bad_address(); \ + } else { \ + result = NEW_C_HEAP_ARRAY(ElementType, len); \ + /* copy the array to the c chunk */ \ + memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \ + } \ + if (isCopy) *isCopy = JNI_TRUE; \ + DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\ + return result; \ +JNI_END + +DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool) +DEFINE_GETSCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte) +DEFINE_GETSCALARARRAYELEMENTS(T_SHORT, jshort, Short, short) +DEFINE_GETSCALARARRAYELEMENTS(T_CHAR, jchar, Char, char) +DEFINE_GETSCALARARRAYELEMENTS(T_INT, jint, Int, int) +DEFINE_GETSCALARARRAYELEMENTS(T_LONG, jlong, Long, long) +DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float) +DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double) + + +#define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \ +\ +JNI_QUICK_ENTRY(void, \ + jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \ + ElementType *buf, jint mode)) \ + JNIWrapper("Release" XSTR(Result) "ArrayElements"); \ + DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\ + typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \ + int len = a->length(); \ + if (len != 0) { /* Empty array: nothing to free or copy. */ \ + if ((mode == 0) || (mode == JNI_COMMIT)) { \ + memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \ + } \ + if ((mode == 0) || (mode == JNI_ABORT)) { \ + FreeHeap(buf); \ + } \ + } \ + DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\ +JNI_END + +DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool) +DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte) +DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT, jshort, Short, short) +DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR, jchar, Char, char) +DEFINE_RELEASESCALARARRAYELEMENTS(T_INT, jint, Int, int) +DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG, jlong, Long, long) +DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float) +DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double) + +#define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \ + DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\ +\ +JNI_ENTRY(void, \ +jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \ + jsize len, ElementType *buf)) \ + JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \ + DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\ + DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \ + typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \ + if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \ + THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \ + } else { \ + if (len > 0) { \ + int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \ + memcpy((u_char*) buf, \ + (u_char*) src->Tag##_at_addr(start), \ + len << sc); \ + } \ + } \ +JNI_END + +DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool) +DEFINE_GETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte) +DEFINE_GETSCALARARRAYREGION(T_SHORT, jshort, Short, short) +DEFINE_GETSCALARARRAYREGION(T_CHAR, jchar, Char, char) +DEFINE_GETSCALARARRAYREGION(T_INT, jint, Int, int) +DEFINE_GETSCALARARRAYREGION(T_LONG, jlong, Long, long) +DEFINE_GETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float) +DEFINE_GETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double) + +#define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \ + DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\ +\ +JNI_ENTRY(void, \ +jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \ + jsize len, const ElementType *buf)) \ + JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \ + DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\ + DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \ + typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \ + if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \ + THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \ + } else { \ + if (len > 0) { \ + int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \ + memcpy((u_char*) dst->Tag##_at_addr(start), \ + (u_char*) buf, \ + len << sc); \ + } \ + } \ +JNI_END + +DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool) +DEFINE_SETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte) +DEFINE_SETSCALARARRAYREGION(T_SHORT, jshort, Short, short) +DEFINE_SETSCALARARRAYREGION(T_CHAR, jchar, Char, char) +DEFINE_SETSCALARARRAYREGION(T_INT, jint, Int, int) +DEFINE_SETSCALARARRAYREGION(T_LONG, jlong, Long, long) +DEFINE_SETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float) +DEFINE_SETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double) + + +// +// Interception of natives +// + +// The RegisterNatives call being attempted tried to register with a method that +// is not native. Ask JVM TI what prefixes have been specified. Then check +// to see if the native method is now wrapped with the prefixes. See the +// SetNativeMethodPrefix(es) functions in the JVM TI Spec for details. +static methodOop find_prefixed_native(KlassHandle k, + symbolHandle name, symbolHandle signature, TRAPS) { + ResourceMark rm(THREAD); + methodOop method; + int name_len = name->utf8_length(); + char* name_str = name->as_utf8(); + int prefix_count; + char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); + for (int i = 0; i < prefix_count; i++) { + char* prefix = prefixes[i]; + int prefix_len = (int)strlen(prefix); + + // try adding this prefix to the method name and see if it matches another method name + int trial_len = name_len + prefix_len; + char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); + strcpy(trial_name_str, prefix); + strcat(trial_name_str, name_str); + symbolHandle trial_name(THREAD, SymbolTable::probe(trial_name_str, trial_len)); + if (trial_name.is_null()) { + continue; // no such symbol, so this prefix wasn't used, try the next prefix + } + method = Klass::cast(k())->lookup_method(trial_name(), signature()); + if (method == NULL) { + continue; // signature doesn't match, try the next prefix + } + if (method->is_native()) { + method->set_is_prefixed_native(); + return method; // wahoo, we found a prefixed version of the method, return it + } + // found as non-native, so prefix is good, add it, probably just need more prefixes + name_len = trial_len; + name_str = trial_name_str; + } + return NULL; // not found +} + +static bool register_native(KlassHandle k, symbolHandle name, symbolHandle signature, address entry, TRAPS) { + methodOop method = Klass::cast(k())->lookup_method(name(), signature()); + if (method == NULL) { + ResourceMark rm; + stringStream st; + st.print("Method %s name or signature does not match", + methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature())); + THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); + } + if (!method->is_native()) { + // trying to register to a non-native method, see if a JVM TI agent has added prefix(es) + method = find_prefixed_native(k, name, signature, THREAD); + if (method == NULL) { + ResourceMark rm; + stringStream st; + st.print("Method %s is not declared as native", + methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature())); + THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); + } + } + + if (entry != NULL) { + method->set_native_function(entry, + methodOopDesc::native_bind_event_is_interesting); + } else { + method->clear_native_function(); + } + if (PrintJNIResolving) { + ResourceMark rm(THREAD); + tty->print_cr("[Registering JNI native method %s.%s]", + Klass::cast(method->method_holder())->external_name(), + method->name()->as_C_string()); + } + return true; +} + +DT_RETURN_MARK_DECL(RegisterNatives, jint); + +JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz, + const JNINativeMethod *methods, + jint nMethods)) + JNIWrapper("RegisterNatives"); + DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods); + jint ret = 0; + DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret); + + KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz))); + + for (int index = 0; index < nMethods; index++) { + const char* meth_name = methods[index].name; + const char* meth_sig = methods[index].signature; + int meth_name_len = (int)strlen(meth_name); + + // The class should have been loaded (we have an instance of the class + // passed in) so the method and signature should already be in the symbol + // table. If they're not there, the method doesn't exist. + symbolHandle name(THREAD, SymbolTable::probe(meth_name, meth_name_len)); + symbolHandle signature(THREAD, SymbolTable::probe(meth_sig, (int)strlen(meth_sig))); + + if (name.is_null() || signature.is_null()) { + ResourceMark rm; + stringStream st; + st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig); + // Must return negative value on failure + THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1); + } + + bool res = register_native(h_k, name, signature, + (address) methods[index].fnPtr, THREAD); + if (!res) { + ret = -1; + break; + } + } + return ret; +JNI_END + + +JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz)) + JNIWrapper("UnregisterNatives"); + DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz); + klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)); + //%note jni_2 + if (Klass::cast(k)->oop_is_instance()) { + for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) { + methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index)); + if (m->is_native()) { + m->clear_native_function(); + m->set_signature_handler(NULL); + } + } + } + DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0); + return 0; +JNI_END + +// +// Monitor functions +// + +DT_RETURN_MARK_DECL(MonitorEnter, jint); + +JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj)) + DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj); + jint ret = JNI_ERR; + DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret); + + // If the object is null, we can't do anything with it + if (jobj == NULL) { + THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR); + } + + Handle obj(thread, JNIHandles::resolve_non_null(jobj)); + ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR)); + ret = JNI_OK; + return ret; +JNI_END + +DT_RETURN_MARK_DECL(MonitorExit, jint); + +JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj)) + DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj); + jint ret = JNI_ERR; + DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret); + + // Don't do anything with a null object + if (jobj == NULL) { + THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR); + } + + Handle obj(THREAD, JNIHandles::resolve_non_null(jobj)); + ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR)); + + ret = JNI_OK; + return ret; +JNI_END + +// +// Extensions +// + +DT_VOID_RETURN_MARK_DECL(GetStringRegion); + +JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf)) + JNIWrapper("GetStringRegion"); + DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf); + DT_VOID_RETURN_MARK(GetStringRegion); + oop s = JNIHandles::resolve_non_null(string); + int s_len = java_lang_String::length(s); + if (start < 0 || len < 0 || start + len > s_len) { + THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException()); + } else { + if (len > 0) { + int s_offset = java_lang_String::offset(s); + typeArrayOop s_value = java_lang_String::value(s); + memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len); + } + } +JNI_END + +DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion); + +JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf)) + JNIWrapper("GetStringUTFRegion"); + DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf); + DT_VOID_RETURN_MARK(GetStringUTFRegion); + oop s = JNIHandles::resolve_non_null(string); + int s_len = java_lang_String::length(s); + if (start < 0 || len < 0 || start + len > s_len) { + THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException()); + } else { + //%note jni_7 + if (len > 0) { + ResourceMark rm(THREAD); + char *utf_region = java_lang_String::as_utf8_string(s, start, len); + int utf_len = (int)strlen(utf_region); + memcpy(buf, utf_region, utf_len); + buf[utf_len] = 0; + } else { + // JDK null-terminates the buffer even in len is zero + if (buf != NULL) { + buf[0] = 0; + } + } + } +JNI_END + + +JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy)) + JNIWrapper("GetPrimitiveArrayCritical"); + DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy); + GC_locker::lock_critical(thread); + if (isCopy != NULL) { + *isCopy = JNI_FALSE; + } + oop a = JNIHandles::resolve_non_null(array); + assert(a->is_array(), "just checking"); + BasicType type; + if (a->is_objArray()) { + type = T_OBJECT; + } else { + type = typeArrayKlass::cast(a->klass())->element_type(); + } + void* ret = arrayOop(a)->base(type); + DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret); + return ret; +JNI_END + + +JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode)) + JNIWrapper("ReleasePrimitiveArrayCritical"); + DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode); + // The array, carray and mode arguments are ignored + GC_locker::unlock_critical(thread); + DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return); +JNI_END + + +JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy)) + JNIWrapper("GetStringCritical"); + DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy); + GC_locker::lock_critical(thread); + if (isCopy != NULL) { + *isCopy = JNI_FALSE; + } + oop s = JNIHandles::resolve_non_null(string); + int s_len = java_lang_String::length(s); + typeArrayOop s_value = java_lang_String::value(s); + int s_offset = java_lang_String::offset(s); + const jchar* ret; + if (s_len > 0) { + ret = s_value->char_at_addr(s_offset); + } else { + ret = (jchar*) s_value->base(T_CHAR); + } + DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret); + return ret; +JNI_END + + +JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars)) + JNIWrapper("ReleaseStringCritical"); + DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars); + // The str and chars arguments are ignored + GC_locker::unlock_critical(thread); + DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return); +JNI_END + + +JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref)) + JNIWrapper("jni_NewWeakGlobalRef"); + DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref); + Handle ref_handle(thread, JNIHandles::resolve(ref)); + jweak ret = JNIHandles::make_weak_global(ref_handle); + DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret); + return ret; +JNI_END + +// Must be JNI_ENTRY (with HandleMark) +JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref)) + JNIWrapper("jni_DeleteWeakGlobalRef"); + DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref); + JNIHandles::destroy_weak_global(ref); + DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return); +JNI_END + + +JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env)) + JNIWrapper("jni_ExceptionCheck"); + DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env); + jni_check_async_exceptions(thread); + jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE; + DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret); + return ret; +JNI_END + + +// Initialization state for three routines below relating to +// java.nio.DirectBuffers +static jint directBufferSupportInitializeStarted = 0; +static volatile jint directBufferSupportInitializeEnded = 0; +static volatile jint directBufferSupportInitializeFailed = 0; +static jclass bufferClass = NULL; +static jclass directBufferClass = NULL; +static jclass directByteBufferClass = NULL; +static jmethodID directByteBufferConstructor = NULL; +static jfieldID directBufferAddressField = NULL; +static jfieldID bufferCapacityField = NULL; + +static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) { + Handle loader; // null (bootstrap) loader + Handle protection_domain; // null protection domain + + symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL); + return find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL); +} + +// These lookups are done with the NULL (bootstrap) ClassLoader to +// circumvent any security checks that would be done by jni_FindClass. +JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env)) +{ + if ((bufferClass = lookupOne(env, "java/nio/Buffer", thread)) == NULL) { return false; } + if ((directBufferClass = lookupOne(env, "sun/nio/ch/DirectBuffer", thread)) == NULL) { return false; } + if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; } + return true; +} +JNI_END + + +static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) { + if (directBufferSupportInitializeFailed) { + return false; + } + + if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) { + if (!lookupDirectBufferClasses(env)) { + directBufferSupportInitializeFailed = 1; + return false; + } + + // Make global references for these + bufferClass = (jclass) env->NewGlobalRef(bufferClass); + directBufferClass = (jclass) env->NewGlobalRef(directBufferClass); + directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass); + + // Get needed field and method IDs + directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V"); + directBufferAddressField = env->GetFieldID(bufferClass, "address", "J"); + bufferCapacityField = env->GetFieldID(bufferClass, "capacity", "I"); + + if ((directByteBufferConstructor == NULL) || + (directBufferAddressField == NULL) || + (bufferCapacityField == NULL)) { + directBufferSupportInitializeFailed = 1; + return false; + } + + directBufferSupportInitializeEnded = 1; + } else { + ThreadInVMfromNative tivn(thread); // set state as yield_all can call os:sleep + while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) { + os::yield_all(); + } + } + + return !directBufferSupportInitializeFailed; +} + +extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity) +{ + // thread_from_jni_environment() will block if VM is gone. + JavaThread* thread = JavaThread::thread_from_jni_environment(env); + + JNIWrapper("jni_NewDirectByteBuffer"); + DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity); + + if (!directBufferSupportInitializeEnded) { + if (!initializeDirectBufferSupport(env, thread)) { + DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL); + return NULL; + } + } + + // Being paranoid about accidental sign extension on address + jlong addr = (jlong) ((uintptr_t) address); + // NOTE that package-private DirectByteBuffer constructor currently + // takes int capacity + jint cap = (jint) capacity; + jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap); + DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret); + return ret; +} + +DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*); + +extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf) +{ + // thread_from_jni_environment() will block if VM is gone. + JavaThread* thread = JavaThread::thread_from_jni_environment(env); + + JNIWrapper("jni_GetDirectBufferAddress"); + DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf); + void* ret = NULL; + DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret); + + if (!directBufferSupportInitializeEnded) { + if (!initializeDirectBufferSupport(env, thread)) { + return 0; + } + } + + if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) { + return 0; + } + + ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField); + return ret; +} + +DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong); + +extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf) +{ + // thread_from_jni_environment() will block if VM is gone. + JavaThread* thread = JavaThread::thread_from_jni_environment(env); + + JNIWrapper("jni_GetDirectBufferCapacity"); + DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf); + jlong ret = -1; + DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret); + + if (!directBufferSupportInitializeEnded) { + if (!initializeDirectBufferSupport(env, thread)) { + ret = 0; + return ret; + } + } + + if (buf == NULL) { + return -1; + } + + if (!env->IsInstanceOf(buf, directBufferClass)) { + return -1; + } + + // NOTE that capacity is currently an int in the implementation + ret = env->GetIntField(buf, bufferCapacityField); + return ret; +} + + +JNI_LEAF(jint, jni_GetVersion(JNIEnv *env)) + JNIWrapper("GetVersion"); + DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env); + DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion); + return CurrentVersion; +JNI_END + +extern struct JavaVM_ main_vm; + +JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm)) + JNIWrapper("jni_GetJavaVM"); + DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm); + *vm = (JavaVM *)(&main_vm); + DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK); + return JNI_OK; +JNI_END + +// Structure containing all jni functions +struct JNINativeInterface_ jni_NativeInterface = { + NULL, + NULL, + NULL, + + NULL, + + jni_GetVersion, + + jni_DefineClass, + jni_FindClass, + + jni_FromReflectedMethod, + jni_FromReflectedField, + + jni_ToReflectedMethod, + + jni_GetSuperclass, + jni_IsAssignableFrom, + + jni_ToReflectedField, + + jni_Throw, + jni_ThrowNew, + jni_ExceptionOccurred, + jni_ExceptionDescribe, + jni_ExceptionClear, + jni_FatalError, + + jni_PushLocalFrame, + jni_PopLocalFrame, + + jni_NewGlobalRef, + jni_DeleteGlobalRef, + jni_DeleteLocalRef, + jni_IsSameObject, + + jni_NewLocalRef, + jni_EnsureLocalCapacity, + + jni_AllocObject, + jni_NewObject, + jni_NewObjectV, + jni_NewObjectA, + + jni_GetObjectClass, + jni_IsInstanceOf, + + jni_GetMethodID, + + jni_CallObjectMethod, + jni_CallObjectMethodV, + jni_CallObjectMethodA, + jni_CallBooleanMethod, + jni_CallBooleanMethodV, + jni_CallBooleanMethodA, + jni_CallByteMethod, + jni_CallByteMethodV, + jni_CallByteMethodA, + jni_CallCharMethod, + jni_CallCharMethodV, + jni_CallCharMethodA, + jni_CallShortMethod, + jni_CallShortMethodV, + jni_CallShortMethodA, + jni_CallIntMethod, + jni_CallIntMethodV, + jni_CallIntMethodA, + jni_CallLongMethod, + jni_CallLongMethodV, + jni_CallLongMethodA, + jni_CallFloatMethod, + jni_CallFloatMethodV, + jni_CallFloatMethodA, + jni_CallDoubleMethod, + jni_CallDoubleMethodV, + jni_CallDoubleMethodA, + jni_CallVoidMethod, + jni_CallVoidMethodV, + jni_CallVoidMethodA, + + jni_CallNonvirtualObjectMethod, + jni_CallNonvirtualObjectMethodV, + jni_CallNonvirtualObjectMethodA, + jni_CallNonvirtualBooleanMethod, + jni_CallNonvirtualBooleanMethodV, + jni_CallNonvirtualBooleanMethodA, + jni_CallNonvirtualByteMethod, + jni_CallNonvirtualByteMethodV, + jni_CallNonvirtualByteMethodA, + jni_CallNonvirtualCharMethod, + jni_CallNonvirtualCharMethodV, + jni_CallNonvirtualCharMethodA, + jni_CallNonvirtualShortMethod, + jni_CallNonvirtualShortMethodV, + jni_CallNonvirtualShortMethodA, + jni_CallNonvirtualIntMethod, + jni_CallNonvirtualIntMethodV, + jni_CallNonvirtualIntMethodA, + jni_CallNonvirtualLongMethod, + jni_CallNonvirtualLongMethodV, + jni_CallNonvirtualLongMethodA, + jni_CallNonvirtualFloatMethod, + jni_CallNonvirtualFloatMethodV, + jni_CallNonvirtualFloatMethodA, + jni_CallNonvirtualDoubleMethod, + jni_CallNonvirtualDoubleMethodV, + jni_CallNonvirtualDoubleMethodA, + jni_CallNonvirtualVoidMethod, + jni_CallNonvirtualVoidMethodV, + jni_CallNonvirtualVoidMethodA, + + jni_GetFieldID, + + jni_GetObjectField, + jni_GetBooleanField, + jni_GetByteField, + jni_GetCharField, + jni_GetShortField, + jni_GetIntField, + jni_GetLongField, + jni_GetFloatField, + jni_GetDoubleField, + + jni_SetObjectField, + jni_SetBooleanField, + jni_SetByteField, + jni_SetCharField, + jni_SetShortField, + jni_SetIntField, + jni_SetLongField, + jni_SetFloatField, + jni_SetDoubleField, + + jni_GetStaticMethodID, + + jni_CallStaticObjectMethod, + jni_CallStaticObjectMethodV, + jni_CallStaticObjectMethodA, + jni_CallStaticBooleanMethod, + jni_CallStaticBooleanMethodV, + jni_CallStaticBooleanMethodA, + jni_CallStaticByteMethod, + jni_CallStaticByteMethodV, + jni_CallStaticByteMethodA, + jni_CallStaticCharMethod, + jni_CallStaticCharMethodV, + jni_CallStaticCharMethodA, + jni_CallStaticShortMethod, + jni_CallStaticShortMethodV, + jni_CallStaticShortMethodA, + jni_CallStaticIntMethod, + jni_CallStaticIntMethodV, + jni_CallStaticIntMethodA, + jni_CallStaticLongMethod, + jni_CallStaticLongMethodV, + jni_CallStaticLongMethodA, + jni_CallStaticFloatMethod, + jni_CallStaticFloatMethodV, + jni_CallStaticFloatMethodA, + jni_CallStaticDoubleMethod, + jni_CallStaticDoubleMethodV, + jni_CallStaticDoubleMethodA, + jni_CallStaticVoidMethod, + jni_CallStaticVoidMethodV, + jni_CallStaticVoidMethodA, + + jni_GetStaticFieldID, + + jni_GetStaticObjectField, + jni_GetStaticBooleanField, + jni_GetStaticByteField, + jni_GetStaticCharField, + jni_GetStaticShortField, + jni_GetStaticIntField, + jni_GetStaticLongField, + jni_GetStaticFloatField, + jni_GetStaticDoubleField, + + jni_SetStaticObjectField, + jni_SetStaticBooleanField, + jni_SetStaticByteField, + jni_SetStaticCharField, + jni_SetStaticShortField, + jni_SetStaticIntField, + jni_SetStaticLongField, + jni_SetStaticFloatField, + jni_SetStaticDoubleField, + + jni_NewString, + jni_GetStringLength, + jni_GetStringChars, + jni_ReleaseStringChars, + + jni_NewStringUTF, + jni_GetStringUTFLength, + jni_GetStringUTFChars, + jni_ReleaseStringUTFChars, + + jni_GetArrayLength, + + jni_NewObjectArray, + jni_GetObjectArrayElement, + jni_SetObjectArrayElement, + + jni_NewBooleanArray, + jni_NewByteArray, + jni_NewCharArray, + jni_NewShortArray, + jni_NewIntArray, + jni_NewLongArray, + jni_NewFloatArray, + jni_NewDoubleArray, + + jni_GetBooleanArrayElements, + jni_GetByteArrayElements, + jni_GetCharArrayElements, + jni_GetShortArrayElements, + jni_GetIntArrayElements, + jni_GetLongArrayElements, + jni_GetFloatArrayElements, + jni_GetDoubleArrayElements, + + jni_ReleaseBooleanArrayElements, + jni_ReleaseByteArrayElements, + jni_ReleaseCharArrayElements, + jni_ReleaseShortArrayElements, + jni_ReleaseIntArrayElements, + jni_ReleaseLongArrayElements, + jni_ReleaseFloatArrayElements, + jni_ReleaseDoubleArrayElements, + + jni_GetBooleanArrayRegion, + jni_GetByteArrayRegion, + jni_GetCharArrayRegion, + jni_GetShortArrayRegion, + jni_GetIntArrayRegion, + jni_GetLongArrayRegion, + jni_GetFloatArrayRegion, + jni_GetDoubleArrayRegion, + + jni_SetBooleanArrayRegion, + jni_SetByteArrayRegion, + jni_SetCharArrayRegion, + jni_SetShortArrayRegion, + jni_SetIntArrayRegion, + jni_SetLongArrayRegion, + jni_SetFloatArrayRegion, + jni_SetDoubleArrayRegion, + + jni_RegisterNatives, + jni_UnregisterNatives, + + jni_MonitorEnter, + jni_MonitorExit, + + jni_GetJavaVM, + + jni_GetStringRegion, + jni_GetStringUTFRegion, + + jni_GetPrimitiveArrayCritical, + jni_ReleasePrimitiveArrayCritical, + + jni_GetStringCritical, + jni_ReleaseStringCritical, + + jni_NewWeakGlobalRef, + jni_DeleteWeakGlobalRef, + + jni_ExceptionCheck, + + jni_NewDirectByteBuffer, + jni_GetDirectBufferAddress, + jni_GetDirectBufferCapacity, + + // New 1_6 features + + jni_GetObjectRefType +}; + + +// For jvmti use to modify jni function table. +// Java threads in native contiues to run until it is transitioned +// to VM at safepoint. Before the transition or before it is blocked +// for safepoint it may access jni function table. VM could crash if +// any java thread access the jni function table in the middle of memcpy. +// To avoid this each function pointers are copied automically. +void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) { + assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); + intptr_t *a = (intptr_t *) jni_functions(); + intptr_t *b = (intptr_t *) new_jni_NativeInterface; + for (uint i=0; i < sizeof(struct JNINativeInterface_)/sizeof(void *); i++) { + Atomic::store_ptr(*b++, a++); + } +} + +void quicken_jni_functions() { + // Replace Get<Primitive>Field with fast versions + if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access() + && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls +#if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2) + // windows x86 currently needs SEH wrapper and the gain of the fast + // versions currently isn't certain for server vm on uniprocessor. + && os::is_MP() +#endif + ) { + address func; + func = JNI_FastGetField::generate_fast_get_boolean_field(); + if (func != (address)-1) { + jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func; + } + func = JNI_FastGetField::generate_fast_get_byte_field(); + if (func != (address)-1) { + jni_NativeInterface.GetByteField = (GetByteField_t)func; + } + func = JNI_FastGetField::generate_fast_get_char_field(); + if (func != (address)-1) { + jni_NativeInterface.GetCharField = (GetCharField_t)func; + } + func = JNI_FastGetField::generate_fast_get_short_field(); + if (func != (address)-1) { + jni_NativeInterface.GetShortField = (GetShortField_t)func; + } + func = JNI_FastGetField::generate_fast_get_int_field(); + if (func != (address)-1) { + jni_NativeInterface.GetIntField = (GetIntField_t)func; + } + func = JNI_FastGetField::generate_fast_get_long_field(); + if (func != (address)-1) { + jni_NativeInterface.GetLongField = (GetLongField_t)func; + } + func = JNI_FastGetField::generate_fast_get_float_field(); + if (func != (address)-1) { + jni_NativeInterface.GetFloatField = (GetFloatField_t)func; + } + func = JNI_FastGetField::generate_fast_get_double_field(); + if (func != (address)-1) { + jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func; + } + } +} + +// Returns the function structure +struct JNINativeInterface_* jni_functions() { +#ifndef JNICHECK_KERNEL + if (CheckJNICalls) return jni_functions_check(); +#else // JNICHECK_KERNEL + if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm."); +#endif // JNICHECK_KERNEL + return &jni_NativeInterface; +} + +// Returns the function structure +struct JNINativeInterface_* jni_functions_nocheck() { + return &jni_NativeInterface; +} + + +// Invocation API + + +// Forward declaration +extern const struct JNIInvokeInterface_ jni_InvokeInterface; + +// Global invocation API vars +volatile jint vm_created = 0; +// Indicate whether it is safe to recreate VM +volatile jint safe_to_recreate_vm = 1; +struct JavaVM_ main_vm = {&jni_InvokeInterface}; + + +#define JAVASTACKSIZE (400 * 1024) /* Default size of a thread java stack */ +#define PROCSTACKSIZE 0 /* 0 means default size in HPI */ +enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL }; + +HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*); +DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint); + +_JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) { + HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_); + JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_; + jint ret = JNI_ERR; + DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret); + + if (Threads::is_supported_jni_version(args->version)) { + ret = JNI_OK; + } + // 1.1 style no longer supported in hotspot. + // According the JNI spec, we should update args->version on return. + // We also use the structure to communicate with launcher about default + // stack size. + if (args->version == JNI_VERSION_1_1) { + args->version = JNI_VERSION_1_2; + // javaStackSize is int in arguments structure + assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow"); + args->javaStackSize = (jint)(ThreadStackSize * K); + } + return ret; +} + +HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args); +DT_RETURN_MARK_DECL(CreateJavaVM, jint); + +_JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) { + HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args); + + jint result = JNI_ERR; + DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result); + + // At the moment it's only possible to have one Java VM, + // since some of the runtime state is in global variables. + + // We cannot use our mutex locks here, since they only work on + // Threads. We do an atomic compare and exchange to ensure only + // one thread can call this method at a time + + // We use Atomic::xchg rather than Atomic::add/dec since on some platforms + // the add/dec implementations are dependent on whether we are running + // on a multiprocessor, and at this stage of initialization the os::is_MP + // function used to determine this will always return false. Atomic::xchg + // does not have this problem. + if (Atomic::xchg(1, &vm_created) == 1) { + return JNI_ERR; // already created, or create attempt in progress + } + if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) { + return JNI_ERR; // someone tried and failed and retry not allowed. + } + + assert(vm_created == 1, "vm_created is true during the creation"); + + /** + * Certain errors during initialization are recoverable and do not + * prevent this method from being called again at a later time + * (perhaps with different arguments). However, at a certain + * point during initialization if an error occurs we cannot allow + * this function to be called again (or it will crash). In those + * situations, the 'canTryAgain' flag is set to false, which atomically + * sets safe_to_recreate_vm to 1, such that any new call to + * JNI_CreateJavaVM will immediately fail using the above logic. + */ + bool can_try_again = true; + + result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again); + if (result == JNI_OK) { + JavaThread *thread = JavaThread::current(); + /* thread is thread_in_vm here */ + *vm = (JavaVM *)(&main_vm); + *(JNIEnv**)penv = thread->jni_environment(); + + // Tracks the time application was running before GC + RuntimeService::record_application_start(); + + // Notify JVMTI + if (JvmtiExport::should_post_thread_life()) { + JvmtiExport::post_thread_start(thread); + } + // Check if we should compile all classes on bootclasspath + NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();) + // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving. + ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native); + } else { + if (can_try_again) { + // reset safe_to_recreate_vm to 1 so that retrial would be possible + safe_to_recreate_vm = 1; + } + + // Creation failed. We must reset vm_created + *vm = 0; + *(JNIEnv**)penv = 0; + // reset vm_created last to avoid race condition. Use OrderAccess to + // control both compiler and architectural-based reordering. + OrderAccess::release_store(&vm_created, 0); + } + + return result; +} + +HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \ + JavaVM**, jsize, jsize*); +HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint); + +_JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) { + // See bug 4367188, the wrapper can sometimes cause VM crashes + // JNIWrapper("GetCreatedJavaVMs"); + HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \ + vm_buf, bufLen, numVMs); + if (vm_created) { + if (numVMs != NULL) *numVMs = 1; + if (bufLen > 0) *vm_buf = (JavaVM *)(&main_vm); + } else { + if (numVMs != NULL) *numVMs = 0; + } + HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK); + return JNI_OK; +} + +extern "C" { + +DT_RETURN_MARK_DECL(DestroyJavaVM, jint); + +jint JNICALL jni_DestroyJavaVM(JavaVM *vm) { + DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm); + jint res = JNI_ERR; + DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res); + + if (!vm_created) { + res = JNI_ERR; + return res; + } + + JNIWrapper("DestroyJavaVM"); + JNIEnv *env; + JavaVMAttachArgs destroyargs; + destroyargs.version = CurrentVersion; + destroyargs.name = (char *)"DestroyJavaVM"; + destroyargs.group = NULL; + res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs); + if (res != JNI_OK) { + return res; + } + + // Since this is not a JVM_ENTRY we have to set the thread state manually before entering. + JavaThread* thread = JavaThread::current(); + ThreadStateTransition::transition_from_native(thread, _thread_in_vm); + if (Threads::destroy_vm()) { + // Should not change thread state, VM is gone + vm_created = false; + res = JNI_OK; + return res; + } else { + ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native); + res = JNI_ERR; + return res; + } +} + + +static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) { + JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args; + + // Check below commented out from JDK1.2fcs as well + /* + if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) { + return JNI_EVERSION; + } + */ + + Thread* t = ThreadLocalStorage::get_thread_slow(); + if (t != NULL) { + // If the thread has been attached this operation is a no-op + *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment(); + return JNI_OK; + } + + // Create a thread and mark it as attaching so it will be skipped by the + // ThreadsListEnumerator - see CR 6404306 + JavaThread* thread = new JavaThread(true); + + // Set correct safepoint info. The thread is going to call into Java when + // initializing the Java level thread object. Hence, the correct state must + // be set in order for the Safepoint code to deal with it correctly. + thread->set_thread_state(_thread_in_vm); + // Must do this before initialize_thread_local_storage + thread->record_stack_base_and_size(); + thread->initialize_thread_local_storage(); + + if (!os::create_attached_thread(thread)) { + delete thread; + return JNI_ERR; + } + thread->initialize_tlab(); + + // Crucial that we do not have a safepoint check for this thread, since it has + // not been added to the Thread list yet. + { Threads_lock->lock_without_safepoint_check(); + // This must be inside this lock in order to get FullGCALot to work properly, i.e., to + // avoid this thread trying to do a GC before it is added to the thread-list + thread->set_active_handles(JNIHandleBlock::allocate_block()); + Threads::add(thread, daemon); + Threads_lock->unlock(); + } + // Create thread group and name info from attach arguments + oop group = NULL; + char* thread_name = NULL; + if (args != NULL && Threads::is_supported_jni_version(args->version)) { + group = JNIHandles::resolve(args->group); + thread_name = args->name; // may be NULL + } + if (group == NULL) group = Universe::main_thread_group(); + + // Create Java level thread object and attach it to this thread + bool attach_failed = false; + { + EXCEPTION_MARK; + HandleMark hm(THREAD); + Handle thread_group(THREAD, group); + thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD); + if (HAS_PENDING_EXCEPTION) { + CLEAR_PENDING_EXCEPTION; + // cleanup outside the handle mark. + attach_failed = true; + } + } + + if (attach_failed) { + // Added missing cleanup + thread->cleanup_failed_attach_current_thread(); + return JNI_ERR; + } + + // mark the thread as no longer attaching + // this uses a fence to push the change through so we don't have + // to regrab the threads_lock + thread->set_attached(); + + // Enable stack overflow checks + thread->create_stack_guard_pages(); + + // Set java thread status. + java_lang_Thread::set_thread_status(thread->threadObj(), + java_lang_Thread::RUNNABLE); + + // Notify the debugger + if (JvmtiExport::should_post_thread_life()) { + JvmtiExport::post_thread_start(thread); + } + + *(JNIEnv**)penv = thread->jni_environment(); + + // Now leaving the VM, so change thread_state. This is normally automatically taken care + // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by + // using ThreadStateTransition::transition, we do a callback to the safepoint code if + // needed. + + ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native); + + // Perform any platform dependent FPU setup + os::setup_fpu(); + + return JNI_OK; +} + + +jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) { + DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args); + if (!vm_created) { + DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR); + return JNI_ERR; + } + + JNIWrapper("AttachCurrentThread"); + jint ret = attach_current_thread(vm, penv, _args, false); + DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret); + return ret; +} + + +jint JNICALL jni_DetachCurrentThread(JavaVM *vm) { + DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm); + VM_Exit::block_if_vm_exited(); + + JNIWrapper("DetachCurrentThread"); + + // If the thread has been deattacted the operations is a no-op + if (ThreadLocalStorage::thread() == NULL) { + DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK); + return JNI_OK; + } + + JavaThread* thread = JavaThread::current(); + if (thread->has_last_Java_frame()) { + DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR); + // Can't detach a thread that's running java, that can't work. + return JNI_ERR; + } + + // Safepoint support. Have to do call-back to safepoint code, if in the + // middel of a safepoint operation + ThreadStateTransition::transition_from_native(thread, _thread_in_vm); + + // XXX: Note that JavaThread::exit() call below removes the guards on the + // stack pages set up via enable_stack_{red,yellow}_zone() calls + // above in jni_AttachCurrentThread. Unfortunately, while the setting + // of the guards is visible in jni_AttachCurrentThread above, + // the removal of the guards is buried below in JavaThread::exit() + // here. The abstraction should be more symmetrically either exposed + // or hidden (e.g. it could probably be hidden in the same + // (platform-dependent) methods where we do alternate stack + // maintenance work?) + thread->exit(false, JavaThread::jni_detach); + delete thread; + + DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK); + return JNI_OK; +} + +DT_RETURN_MARK_DECL(GetEnv, jint); + +jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) { + DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version); + jint ret = JNI_ERR; + DT_RETURN_MARK(GetEnv, jint, (const jint&)ret); + + if (!vm_created) { + *penv = NULL; + ret = JNI_EDETACHED; + return ret; + } + + if (JvmtiExport::is_jvmti_version(version)) { + ret = JvmtiExport::get_jvmti_interface(vm, penv, version); + return ret; + } + +#ifndef JVMPI_VERSION_1 +// need these in order to be polite about older agents +#define JVMPI_VERSION_1 ((jint)0x10000001) +#define JVMPI_VERSION_1_1 ((jint)0x10000002) +#define JVMPI_VERSION_1_2 ((jint)0x10000003) +#endif // !JVMPI_VERSION_1 + + Thread* thread = ThreadLocalStorage::thread(); + if (thread != NULL && thread->is_Java_thread()) { + if (Threads::is_supported_jni_version_including_1_1(version)) { + *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment(); + ret = JNI_OK; + return ret; + + } else if (version == JVMPI_VERSION_1 || + version == JVMPI_VERSION_1_1 || + version == JVMPI_VERSION_1_2) { + tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported."); + tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI)."); + ret = JNI_EVERSION; + return ret; + } else if (JvmtiExport::is_jvmdi_version(version)) { + tty->print_cr("FATAL ERROR: JVMDI is no longer supported."); + tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI)."); + ret = JNI_EVERSION; + return ret; + } else { + *penv = NULL; + ret = JNI_EVERSION; + return ret; + } + } else { + *penv = NULL; + ret = JNI_EDETACHED; + return ret; + } +} + + +jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) { + DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args); + if (!vm_created) { + DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR); + return JNI_ERR; + } + + JNIWrapper("AttachCurrentThreadAsDaemon"); + jint ret = attach_current_thread(vm, penv, _args, true); + DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret); + return ret; +} + + +} // End extern "C" + +const struct JNIInvokeInterface_ jni_InvokeInterface = { + NULL, + NULL, + NULL, + + jni_DestroyJavaVM, + jni_AttachCurrentThread, + jni_DetachCurrentThread, + jni_GetEnv, + jni_AttachCurrentThreadAsDaemon +};