607 lines
21 KiB
C++
607 lines
21 KiB
C++
/*
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* Copyright (c) 1997, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/nmethod.hpp"
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#include "compiler/compileBroker.hpp"
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#include "interpreter/interpreter.hpp"
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#include "interpreter/linkResolver.hpp"
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#include "memory/universe.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "prims/jniCheck.hpp"
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#include "runtime/compilationPolicy.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/os.inline.hpp"
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#include "runtime/signature.hpp"
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#include "runtime/stubRoutines.hpp"
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#include "runtime/thread.inline.hpp"
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#if INCLUDE_JVMCI
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#include "jvmci/jvmciJavaClasses.hpp"
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#include "jvmci/jvmciRuntime.hpp"
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#endif
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// -----------------------------------------------------
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// Implementation of JavaCallWrapper
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JavaCallWrapper::JavaCallWrapper(const 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->can_call_java(), "cannot make java calls from the native compiler");
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_result = result;
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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(&_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*)&_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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default:
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ShouldNotReachHere();
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return T_ILLEGAL;
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}
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}
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// ============ Virtual calls ============
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void JavaCalls::call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
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CallInfo callinfo;
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Handle receiver = args->receiver();
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Klass* recvrKlass = receiver.is_null() ? (Klass*)NULL : receiver->klass();
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LinkInfo link_info(spec_klass, name, signature);
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LinkResolver::resolve_virtual_call(
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callinfo, receiver, recvrKlass, link_info, 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, Klass* spec_klass, Symbol* name, Symbol* 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, Klass* spec_klass, Symbol* name, Symbol* 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, Klass* spec_klass, Symbol* name, Symbol* 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, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
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CallInfo callinfo;
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LinkInfo link_info(klass, name, signature);
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LinkResolver::resolve_special_call(callinfo, args->receiver(), link_info, 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, Klass* klass, Symbol* name, Symbol* 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, Klass* klass, Symbol* name, Symbol* 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, Klass* klass, Symbol* name, Symbol* 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, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
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CallInfo callinfo;
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LinkInfo link_info(klass, name, signature);
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LinkResolver::resolve_static_call(callinfo, link_info, 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, Klass* klass, Symbol* name, Symbol* 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, Klass* klass, Symbol* name, Symbol* 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, Klass* klass, Symbol* name, Symbol* 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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void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, 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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args.push_oop(arg3);
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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, const 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 every time, 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, const methodHandle& method, JavaCallArguments* args, TRAPS) {
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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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#if INCLUDE_JVMCI
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// Gets the nmethod (if any) that should be called instead of normal target
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nmethod* alternative_target = args->alternative_target();
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if (alternative_target == NULL) {
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#endif
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// Verify the arguments
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if (CheckJNICalls) {
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args->verify(method, result->get_type());
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}
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else debug_only(args->verify(method, result->get_type()));
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#if INCLUDE_JVMCI
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}
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#else
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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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#endif
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#ifdef ASSERT
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{ InstanceKlass* 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(holder->is_linked(), "rewriting must have taken place");
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}
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#endif
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CompilationPolicy::compile_if_required(method, CHECK);
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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 reserved/yellow zone which
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// might already be disabled when we are in VM.
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if (!thread->stack_guards_enabled()) {
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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. Calculate current_stack_pointer here to make sure
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// stack_shadow_pages_available() and bang_stack_shadow_pages() use the same sp.
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address sp = os::current_stack_pointer();
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if (!os::stack_shadow_pages_available(THREAD, method, sp)) {
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// Throw stack overflow exception with preinitialized exception.
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Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method);
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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::map_stack_shadow_pages(sp);
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}
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#if INCLUDE_JVMCI
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if (alternative_target != NULL) {
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if (alternative_target->is_alive()) {
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thread->set_jvmci_alternate_call_target(alternative_target->verified_entry_point());
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entry_point = method->adapter()->get_i2c_entry();
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} else {
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THROW(vmSymbols::jdk_vm_ci_code_InvalidInstalledCodeException());
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}
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}
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#endif
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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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StubRoutines::call_stub()(
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(address)&link,
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// (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
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result_val_address, // see NOTE above (compiler problem)
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result_type,
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method(),
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entry_point,
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args->parameters(),
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args->size_of_parameters(),
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CHECK
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);
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result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
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// Preserve oop return value across possible gc points
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if (oop_result_flag) {
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thread->set_vm_result((oop) result->get_jobject());
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}
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}
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} // Exit JavaCallWrapper (can block - potential return oop must be preserved)
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// Check if a thread stop or suspend should be executed
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// The following assert was not realistic. Thread.stop can set that bit at any moment.
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//assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
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// Restore possible oop return
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if (oop_result_flag) {
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result->set_jobject((jobject)thread->vm_result());
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thread->set_vm_result(NULL);
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}
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}
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//--------------------------------------------------------------------------------------
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// Implementation of JavaCallArguments
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inline bool is_value_state_indirect_oop(uint state) {
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assert(state != JavaCallArguments::value_state_oop,
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"Checking for handles after removal");
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assert(state < JavaCallArguments::value_state_limit,
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"Invalid value state %u", state);
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return state != JavaCallArguments::value_state_primitive;
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}
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inline oop resolve_indirect_oop(intptr_t value, uint state) {
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switch (state) {
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case JavaCallArguments::value_state_handle:
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{
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oop* ptr = reinterpret_cast<oop*>(value);
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return Handle::raw_resolve(ptr);
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}
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case JavaCallArguments::value_state_jobject:
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{
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jobject obj = reinterpret_cast<jobject>(value);
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return JNIHandles::resolve(obj);
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}
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default:
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ShouldNotReachHere();
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return NULL;
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}
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}
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intptr_t* JavaCallArguments::parameters() {
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// First convert all handles to oops
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for(int i = 0; i < _size; i++) {
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uint state = _value_state[i];
|
|
assert(state != value_state_oop, "Multiple handle conversions");
|
|
if (is_value_state_indirect_oop(state)) {
|
|
oop obj = resolve_indirect_oop(_value[i], state);
|
|
_value[i] = cast_from_oop<intptr_t>(obj);
|
|
_value_state[i] = value_state_oop;
|
|
}
|
|
}
|
|
// Return argument vector
|
|
return _value;
|
|
}
|
|
|
|
|
|
class SignatureChekker : public SignatureIterator {
|
|
private:
|
|
int _pos;
|
|
BasicType _return_type;
|
|
u_char* _value_state;
|
|
intptr_t* _value;
|
|
|
|
public:
|
|
bool _is_return;
|
|
|
|
SignatureChekker(Symbol* signature,
|
|
BasicType return_type,
|
|
bool is_static,
|
|
u_char* value_state,
|
|
intptr_t* value) :
|
|
SignatureIterator(signature),
|
|
_pos(0),
|
|
_return_type(return_type),
|
|
_value_state(value_state),
|
|
_value(value),
|
|
_is_return(false)
|
|
{
|
|
if (!is_static) {
|
|
check_value(true); // Receiver must be an oop
|
|
}
|
|
}
|
|
|
|
void check_value(bool type) {
|
|
uint state = _value_state[_pos++];
|
|
if (type) {
|
|
guarantee(is_value_state_indirect_oop(state),
|
|
"signature does not match pushed arguments: %u at %d",
|
|
state, _pos - 1);
|
|
} else {
|
|
guarantee(state == JavaCallArguments::value_state_primitive,
|
|
"signature does not match pushed arguments: %u at %d",
|
|
state, _pos - 1);
|
|
}
|
|
}
|
|
|
|
void check_doing_return(bool state) { _is_return = state; }
|
|
|
|
void check_return_type(BasicType t) {
|
|
guarantee(_is_return && t == _return_type, "return type does not match");
|
|
}
|
|
|
|
void check_int(BasicType t) {
|
|
if (_is_return) {
|
|
check_return_type(t);
|
|
return;
|
|
}
|
|
check_value(false);
|
|
}
|
|
|
|
void check_double(BasicType t) { check_long(t); }
|
|
|
|
void check_long(BasicType t) {
|
|
if (_is_return) {
|
|
check_return_type(t);
|
|
return;
|
|
}
|
|
|
|
check_value(false);
|
|
check_value(false);
|
|
}
|
|
|
|
void check_obj(BasicType t) {
|
|
if (_is_return) {
|
|
check_return_type(t);
|
|
return;
|
|
}
|
|
|
|
intptr_t v = _value[_pos];
|
|
if (v != 0) {
|
|
// v is a "handle" referring to an oop, cast to integral type.
|
|
// There shouldn't be any handles in very low memory.
|
|
guarantee((size_t)v >= (size_t)os::vm_page_size(),
|
|
"Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
|
|
// Verify the pointee.
|
|
oop vv = resolve_indirect_oop(v, _value_state[_pos]);
|
|
guarantee(oopDesc::is_oop_or_null(vv, true),
|
|
"Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
|
|
_pos, v, p2i(vv));
|
|
}
|
|
|
|
check_value(true); // Verify value state.
|
|
}
|
|
|
|
void do_bool() { check_int(T_BOOLEAN); }
|
|
void do_char() { check_int(T_CHAR); }
|
|
void do_float() { check_int(T_FLOAT); }
|
|
void do_double() { check_double(T_DOUBLE); }
|
|
void do_byte() { check_int(T_BYTE); }
|
|
void do_short() { check_int(T_SHORT); }
|
|
void do_int() { check_int(T_INT); }
|
|
void do_long() { check_long(T_LONG); }
|
|
void do_void() { check_return_type(T_VOID); }
|
|
void do_object(int begin, int end) { check_obj(T_OBJECT); }
|
|
void do_array(int begin, int end) { check_obj(T_OBJECT); }
|
|
};
|
|
|
|
|
|
void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
|
|
guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
|
|
|
|
// Treat T_OBJECT and T_ARRAY as the same
|
|
if (return_type == T_ARRAY) return_type = T_OBJECT;
|
|
|
|
// Check that oop information is correct
|
|
Symbol* signature = method->signature();
|
|
|
|
SignatureChekker sc(signature,
|
|
return_type,
|
|
method->is_static(),
|
|
_value_state,
|
|
_value);
|
|
sc.iterate_parameters();
|
|
sc.check_doing_return(true);
|
|
sc.iterate_returntype();
|
|
}
|