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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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#include "incls/_precompiled.incl"
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#include "incls/_javaCalls.cpp.incl"
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// -----------------------------------------------------
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// Implementation of JavaCallWrapper
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JavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) {
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JavaThread* thread = (JavaThread *)THREAD;
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bool clear_pending_exception = true;
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guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
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assert(!thread->owns_locks(), "must release all locks when leaving VM");
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guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler");
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_result = result;
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// Make sure that that the value of the higest_lock is at least the same as the current stackpointer,
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// since, the Java code is highly likely to use locks.
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// Use '(address)this' to guarantee that highest_lock address is conservative and inside our thread
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thread->update_highest_lock((address)this);
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// Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub,
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// since it can potentially block.
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JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
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// After this, we are official in JavaCode. This needs to be done before we change any of the thread local
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// info, since we cannot find oops before the new information is set up completely.
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ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java);
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// Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state
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// in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions
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// to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state).
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if (thread->has_special_runtime_exit_condition()) {
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thread->handle_special_runtime_exit_condition();
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if (HAS_PENDING_EXCEPTION) {
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clear_pending_exception = false;
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}
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}
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// Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
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// the JavaCallWrapper before the entry frame is on the stack.
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_callee_method = callee_method();
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_receiver = receiver();
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#ifdef CHECK_UNHANDLED_OOPS
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THREAD->allow_unhandled_oop(&_callee_method);
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THREAD->allow_unhandled_oop(&_receiver);
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#endif // CHECK_UNHANDLED_OOPS
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_thread = (JavaThread *)thread;
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_handles = _thread->active_handles(); // save previous handle block & Java frame linkage
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// For the profiler, the last_Java_frame information in thread must always be in
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// legal state. We have no last Java frame if last_Java_sp == NULL so
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// the valid transition is to clear _last_Java_sp and then reset the rest of
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// the (platform specific) state.
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_anchor.copy(_thread->frame_anchor());
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_thread->frame_anchor()->clear();
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debug_only(_thread->inc_java_call_counter());
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_thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage
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assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
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// clear any pending exception in thread (native calls start with no exception pending)
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if(clear_pending_exception) {
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_thread->clear_pending_exception();
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}
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if (_anchor.last_Java_sp() == NULL) {
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_thread->record_base_of_stack_pointer();
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}
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}
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JavaCallWrapper::~JavaCallWrapper() {
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assert(_thread == JavaThread::current(), "must still be the same thread");
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// restore previous handle block & Java frame linkage
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JNIHandleBlock *_old_handles = _thread->active_handles();
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_thread->set_active_handles(_handles);
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_thread->frame_anchor()->zap();
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debug_only(_thread->dec_java_call_counter());
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if (_anchor.last_Java_sp() == NULL) {
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_thread->set_base_of_stack_pointer(NULL);
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}
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// Old thread-local info. has been restored. We are not back in the VM.
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ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
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// State has been restored now make the anchor frame visible for the profiler.
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// Do this after the transition because this allows us to put an assert
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// the Java->vm transition which checks to see that stack is not walkable
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// on sparc/ia64 which will catch violations of the reseting of last_Java_frame
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// invariants (i.e. _flags always cleared on return to Java)
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_thread->frame_anchor()->copy(&_anchor);
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// Release handles after we are marked as being inside the VM again, since this
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// operation might block
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JNIHandleBlock::release_block(_old_handles, _thread);
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}
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void JavaCallWrapper::oops_do(OopClosure* f) {
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f->do_oop((oop*)&_callee_method);
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f->do_oop((oop*)&_receiver);
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handles()->oops_do(f);
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}
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// Helper methods
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static BasicType runtime_type_from(JavaValue* result) {
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switch (result->get_type()) {
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case T_BOOLEAN: // fall through
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case T_CHAR : // fall through
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case T_SHORT : // fall through
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case T_INT : // fall through
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#ifndef _LP64
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case T_OBJECT : // fall through
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case T_ARRAY : // fall through
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#endif
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case T_BYTE : // fall through
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case T_VOID : return T_INT;
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case T_LONG : return T_LONG;
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case T_FLOAT : return T_FLOAT;
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case T_DOUBLE : return T_DOUBLE;
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#ifdef _LP64
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case T_ARRAY : // fall through
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case T_OBJECT: return T_OBJECT;
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#endif
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}
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ShouldNotReachHere();
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return T_ILLEGAL;
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}
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// ===== object constructor calls =====
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void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) {
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assert(method->name() == vmSymbols::object_initializer_name(), "Should only be called for default constructor");
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assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor");
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instanceKlass* ik = instanceKlass::cast(method->method_holder());
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if (ik->is_initialized() && ik->has_vanilla_constructor()) {
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// safe to skip constructor call
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} else {
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static JavaValue result(T_VOID);
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JavaCallArguments args(receiver);
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call(&result, method, &args, CHECK);
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}
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}
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// ============ Virtual calls ============
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void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
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CallInfo callinfo;
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Handle receiver = args->receiver();
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KlassHandle recvrKlass(THREAD, receiver.is_null() ? (klassOop)NULL : receiver->klass());
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LinkResolver::resolve_virtual_call(
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callinfo, receiver, recvrKlass, spec_klass, name, signature,
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KlassHandle(), false, true, CHECK);
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methodHandle method = callinfo.selected_method();
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assert(method.not_null(), "should have thrown exception");
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// Invoke the method
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JavaCalls::call(result, method, args, CHECK);
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}
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void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, TRAPS) {
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JavaCallArguments args(receiver); // One oop argument
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call_virtual(result, spec_klass, name, signature, &args, CHECK);
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}
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void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
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JavaCallArguments args(receiver); // One oop argument
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args.push_oop(arg1);
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call_virtual(result, spec_klass, name, signature, &args, CHECK);
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}
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void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
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JavaCallArguments args(receiver); // One oop argument
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args.push_oop(arg1);
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args.push_oop(arg2);
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call_virtual(result, spec_klass, name, signature, &args, CHECK);
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}
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// ============ Special calls ============
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void JavaCalls::call_special(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
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CallInfo callinfo;
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LinkResolver::resolve_special_call(callinfo, klass, name, signature, KlassHandle(), false, CHECK);
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methodHandle method = callinfo.selected_method();
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assert(method.not_null(), "should have thrown exception");
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// Invoke the method
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JavaCalls::call(result, method, args, CHECK);
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}
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void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
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JavaCallArguments args(receiver); // One oop argument
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call_special(result, klass, name, signature, &args, CHECK);
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}
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void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
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JavaCallArguments args(receiver); // One oop argument
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args.push_oop(arg1);
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call_special(result, klass, name, signature, &args, CHECK);
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}
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void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
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JavaCallArguments args(receiver); // One oop argument
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args.push_oop(arg1);
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args.push_oop(arg2);
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call_special(result, klass, name, signature, &args, CHECK);
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}
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// ============ Static calls ============
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void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
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CallInfo callinfo;
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LinkResolver::resolve_static_call(callinfo, klass, name, signature, KlassHandle(), false, true, CHECK);
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methodHandle method = callinfo.selected_method();
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assert(method.not_null(), "should have thrown exception");
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// Invoke the method
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JavaCalls::call(result, method, args, CHECK);
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}
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void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
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JavaCallArguments args; // No argument
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call_static(result, klass, name, signature, &args, CHECK);
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}
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void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
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JavaCallArguments args(arg1); // One oop argument
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call_static(result, klass, name, signature, &args, CHECK);
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}
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void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
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JavaCallArguments args; // One oop argument
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args.push_oop(arg1);
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args.push_oop(arg2);
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call_static(result, klass, name, signature, &args, CHECK);
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}
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// -------------------------------------------------
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// Implementation of JavaCalls (low level)
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void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) {
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// Check if we need to wrap a potential OS exception handler around thread
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// This is used for e.g. Win32 structured exception handlers
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assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
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// Need to wrap each and everytime, since there might be native code down the
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// stack that has installed its own exception handlers
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os::os_exception_wrapper(call_helper, result, &method, args, THREAD);
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}
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void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) {
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methodHandle method = *m;
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JavaThread* thread = (JavaThread*)THREAD;
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assert(thread->is_Java_thread(), "must be called by a java thread");
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assert(method.not_null(), "must have a method to call");
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assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
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assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
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CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
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// Make sure that the arguments have the right type
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debug_only(args->verify(method, result->get_type(), thread));
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// Ignore call if method is empty
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if (method->is_empty_method()) {
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assert(result->get_type() == T_VOID, "an empty method must return a void value");
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return;
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}
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#ifdef ASSERT
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{ klassOop holder = method->method_holder();
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// A klass might not be initialized since JavaCall's might be used during the executing of
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// the <clinit>. For example, a Thread.start might start executing on an object that is
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// not fully initialized! (bad Java programming style)
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assert(instanceKlass::cast(holder)->is_linked(), "rewritting must have taken place");
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}
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#endif
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assert(!thread->is_Compiler_thread(), "cannot compile from the compiler");
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if (CompilationPolicy::mustBeCompiled(method)) {
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CompileBroker::compile_method(method, InvocationEntryBci,
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methodHandle(), 0, "mustBeCompiled", CHECK);
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}
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// Since the call stub sets up like the interpreter we call the from_interpreted_entry
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// so we can go compiled via a i2c. Otherwise initial entry method will always
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// run interpreted.
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address entry_point = method->from_interpreted_entry();
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if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
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entry_point = method->interpreter_entry();
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}
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// Figure out if the result value is an oop or not (Note: This is a different value
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// than result_type. result_type will be T_INT of oops. (it is about size)
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BasicType result_type = runtime_type_from(result);
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bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY);
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// NOTE: if we move the computation of the result_val_address inside
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// the call to call_stub, the optimizer produces wrong code.
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intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
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// Find receiver
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Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
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// When we reenter Java, we need to reenable the yellow zone which
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// might already be disabled when we are in VM.
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if (thread->stack_yellow_zone_disabled()) {
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thread->reguard_stack();
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}
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// Check that there are shadow pages available before changing thread state
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// to Java
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if (!os::stack_shadow_pages_available(THREAD, method)) {
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// Throw stack overflow exception with preinitialized exception.
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Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__);
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return;
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} else {
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// Touch pages checked if the OS needs them to be touched to be mapped.
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os::bang_stack_shadow_pages();
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}
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// do call
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{ JavaCallWrapper link(method, receiver, result, CHECK);
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{ HandleMark hm(thread); // HandleMark used by HandleMarkCleaner
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|
|
379 |
StubRoutines::call_stub()(
|
|
380 |
(address)&link,
|
|
381 |
// (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
|
|
382 |
result_val_address, // see NOTE above (compiler problem)
|
|
383 |
result_type,
|
|
384 |
method(),
|
|
385 |
entry_point,
|
|
386 |
args->parameters(),
|
|
387 |
args->size_of_parameters(),
|
|
388 |
CHECK
|
|
389 |
);
|
|
390 |
|
|
391 |
result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
|
|
392 |
// Preserve oop return value across possible gc points
|
|
393 |
if (oop_result_flag) {
|
|
394 |
thread->set_vm_result((oop) result->get_jobject());
|
|
395 |
}
|
|
396 |
}
|
|
397 |
} // Exit JavaCallWrapper (can block - potential return oop must be preserved)
|
|
398 |
|
|
399 |
// Check if a thread stop or suspend should be executed
|
|
400 |
// The following assert was not realistic. Thread.stop can set that bit at any moment.
|
|
401 |
//assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
|
|
402 |
|
|
403 |
// Restore possible oop return
|
|
404 |
if (oop_result_flag) {
|
|
405 |
result->set_jobject((jobject)thread->vm_result());
|
|
406 |
thread->set_vm_result(NULL);
|
|
407 |
}
|
|
408 |
}
|
|
409 |
|
|
410 |
|
|
411 |
//--------------------------------------------------------------------------------------
|
|
412 |
// Implementation of JavaCallArguments
|
|
413 |
|
|
414 |
intptr_t* JavaCallArguments::parameters() {
|
|
415 |
// First convert all handles to oops
|
|
416 |
for(int i = 0; i < _size; i++) {
|
|
417 |
if (_is_oop[i]) {
|
|
418 |
// Handle conversion
|
|
419 |
_value[i] = (intptr_t)Handle::raw_resolve((oop *)_value[i]);
|
|
420 |
}
|
|
421 |
// The parameters are moved to the parameters array to include the tags.
|
|
422 |
if (TaggedStackInterpreter) {
|
|
423 |
// Tags are interspersed with arguments. Tags are first.
|
|
424 |
int tagged_index = i*2;
|
|
425 |
_parameters[tagged_index] = _is_oop[i] ? frame::TagReference :
|
|
426 |
frame::TagValue;
|
|
427 |
_parameters[tagged_index+1] = _value[i];
|
|
428 |
}
|
|
429 |
}
|
|
430 |
// Return argument vector
|
|
431 |
return TaggedStackInterpreter ? _parameters : _value;
|
|
432 |
}
|
|
433 |
|
|
434 |
//--------------------------------------------------------------------------------------
|
|
435 |
// Non-Product code
|
|
436 |
#ifndef PRODUCT
|
|
437 |
|
|
438 |
class SignatureChekker : public SignatureIterator {
|
|
439 |
private:
|
|
440 |
bool *_is_oop;
|
|
441 |
int _pos;
|
|
442 |
BasicType _return_type;
|
|
443 |
|
|
444 |
public:
|
|
445 |
bool _is_return;
|
|
446 |
|
|
447 |
SignatureChekker(symbolHandle signature, BasicType return_type, bool is_static, bool* is_oop) : SignatureIterator(signature) {
|
|
448 |
_is_oop = is_oop;
|
|
449 |
_is_return = false;
|
|
450 |
_return_type = return_type;
|
|
451 |
_pos = 0;
|
|
452 |
if (!is_static) {
|
|
453 |
check_value(true); // Receiver must be an oop
|
|
454 |
}
|
|
455 |
}
|
|
456 |
|
|
457 |
void check_value(bool type) {
|
|
458 |
guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments");
|
|
459 |
}
|
|
460 |
|
|
461 |
void check_doing_return(bool state) { _is_return = state; }
|
|
462 |
|
|
463 |
void check_return_type(BasicType t) {
|
|
464 |
guarantee(_is_return && t == _return_type, "return type does not match");
|
|
465 |
}
|
|
466 |
|
|
467 |
void check_int(BasicType t) {
|
|
468 |
if (_is_return) {
|
|
469 |
check_return_type(t);
|
|
470 |
return;
|
|
471 |
}
|
|
472 |
check_value(false);
|
|
473 |
}
|
|
474 |
|
|
475 |
void check_double(BasicType t) { check_long(t); }
|
|
476 |
|
|
477 |
void check_long(BasicType t) {
|
|
478 |
if (_is_return) {
|
|
479 |
check_return_type(t);
|
|
480 |
return;
|
|
481 |
}
|
|
482 |
|
|
483 |
check_value(false);
|
|
484 |
check_value(false);
|
|
485 |
}
|
|
486 |
|
|
487 |
void check_obj(BasicType t) {
|
|
488 |
if (_is_return) {
|
|
489 |
check_return_type(t);
|
|
490 |
return;
|
|
491 |
}
|
|
492 |
check_value(true);
|
|
493 |
}
|
|
494 |
|
|
495 |
void do_bool() { check_int(T_BOOLEAN); }
|
|
496 |
void do_char() { check_int(T_CHAR); }
|
|
497 |
void do_float() { check_int(T_FLOAT); }
|
|
498 |
void do_double() { check_double(T_DOUBLE); }
|
|
499 |
void do_byte() { check_int(T_BYTE); }
|
|
500 |
void do_short() { check_int(T_SHORT); }
|
|
501 |
void do_int() { check_int(T_INT); }
|
|
502 |
void do_long() { check_long(T_LONG); }
|
|
503 |
void do_void() { check_return_type(T_VOID); }
|
|
504 |
void do_object(int begin, int end) { check_obj(T_OBJECT); }
|
|
505 |
void do_array(int begin, int end) { check_obj(T_OBJECT); }
|
|
506 |
};
|
|
507 |
|
|
508 |
void JavaCallArguments::verify(methodHandle method, BasicType return_type,
|
|
509 |
Thread *thread) {
|
|
510 |
guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
|
|
511 |
|
|
512 |
// Treat T_OBJECT and T_ARRAY as the same
|
|
513 |
if (return_type == T_ARRAY) return_type = T_OBJECT;
|
|
514 |
|
|
515 |
// Check that oop information is correct
|
|
516 |
symbolHandle signature (thread, method->signature());
|
|
517 |
|
|
518 |
SignatureChekker sc(signature, return_type, method->is_static(),_is_oop);
|
|
519 |
sc.iterate_parameters();
|
|
520 |
sc.check_doing_return(true);
|
|
521 |
sc.iterate_returntype();
|
|
522 |
}
|
|
523 |
|
|
524 |
#endif // PRODUCT
|