/* * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "code/nmethod.hpp" #include "compiler/compileBroker.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/linkResolver.hpp" #include "memory/universe.inline.hpp" #include "oops/oop.inline.hpp" #include "prims/jniCheck.hpp" #include "runtime/compilationPolicy.hpp" #include "runtime/handles.inline.hpp" #include "runtime/interfaceSupport.hpp" #include "runtime/javaCalls.hpp" #include "runtime/mutexLocker.hpp" #include "runtime/signature.hpp" #include "runtime/stubRoutines.hpp" #include "runtime/thread.inline.hpp" // ----------------------------------------------------- // Implementation of JavaCallWrapper JavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) { JavaThread* thread = (JavaThread *)THREAD; bool clear_pending_exception = true; guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code"); assert(!thread->owns_locks(), "must release all locks when leaving VM"); guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler"); _result = result; // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub, // since it can potentially block. JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread); // After this, we are official in JavaCode. This needs to be done before we change any of the thread local // info, since we cannot find oops before the new information is set up completely. ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java); // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state). if (thread->has_special_runtime_exit_condition()) { thread->handle_special_runtime_exit_condition(); if (HAS_PENDING_EXCEPTION) { clear_pending_exception = false; } } // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing // the JavaCallWrapper before the entry frame is on the stack. _callee_method = callee_method(); _receiver = receiver(); #ifdef CHECK_UNHANDLED_OOPS THREAD->allow_unhandled_oop(&_receiver); #endif // CHECK_UNHANDLED_OOPS _thread = (JavaThread *)thread; _handles = _thread->active_handles(); // save previous handle block & Java frame linkage // For the profiler, the last_Java_frame information in thread must always be in // legal state. We have no last Java frame if last_Java_sp == NULL so // the valid transition is to clear _last_Java_sp and then reset the rest of // the (platform specific) state. _anchor.copy(_thread->frame_anchor()); _thread->frame_anchor()->clear(); debug_only(_thread->inc_java_call_counter()); _thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL"); // clear any pending exception in thread (native calls start with no exception pending) if(clear_pending_exception) { _thread->clear_pending_exception(); } if (_anchor.last_Java_sp() == NULL) { _thread->record_base_of_stack_pointer(); } } void JavaCallWrapper::initialize(JavaThread* thread, JNIHandleBlock* handles, Method* callee_method, oop receiver, JavaValue* result) { _thread = thread; _handles = handles; _callee_method = callee_method; _receiver = receiver; _result = result; _anchor.clear(); } JavaCallWrapper::~JavaCallWrapper() { assert(_thread == JavaThread::current(), "must still be the same thread"); // restore previous handle block & Java frame linkage JNIHandleBlock *_old_handles = _thread->active_handles(); _thread->set_active_handles(_handles); _thread->frame_anchor()->zap(); debug_only(_thread->dec_java_call_counter()); if (_anchor.last_Java_sp() == NULL) { _thread->set_base_of_stack_pointer(NULL); } // Old thread-local info. has been restored. We are not back in the VM. ThreadStateTransition::transition_from_java(_thread, _thread_in_vm); // State has been restored now make the anchor frame visible for the profiler. // Do this after the transition because this allows us to put an assert // the Java->vm transition which checks to see that stack is not walkable // on sparc/ia64 which will catch violations of the reseting of last_Java_frame // invariants (i.e. _flags always cleared on return to Java) _thread->frame_anchor()->copy(&_anchor); // Release handles after we are marked as being inside the VM again, since this // operation might block JNIHandleBlock::release_block(_old_handles, _thread); } void JavaCallWrapper::oops_do(OopClosure* f) { f->do_oop((oop*)&_receiver); handles()->oops_do(f); } // Helper methods static BasicType runtime_type_from(JavaValue* result) { switch (result->get_type()) { case T_BOOLEAN: // fall through case T_CHAR : // fall through case T_SHORT : // fall through case T_INT : // fall through #ifndef _LP64 case T_OBJECT : // fall through case T_ARRAY : // fall through #endif case T_BYTE : // fall through case T_VOID : return T_INT; case T_LONG : return T_LONG; case T_FLOAT : return T_FLOAT; case T_DOUBLE : return T_DOUBLE; #ifdef _LP64 case T_ARRAY : // fall through case T_OBJECT: return T_OBJECT; #endif } ShouldNotReachHere(); return T_ILLEGAL; } // ===== object constructor calls ===== void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) { assert(method->name() == vmSymbols::object_initializer_name(), "Should only be called for default constructor"); assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor"); InstanceKlass* ik = method->method_holder(); if (ik->is_initialized() && ik->has_vanilla_constructor()) { // safe to skip constructor call } else { static JavaValue result(T_VOID); JavaCallArguments args(receiver); call(&result, method, &args, CHECK); } } // ============ Virtual calls ============ void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { CallInfo callinfo; Handle receiver = args->receiver(); KlassHandle recvrKlass(THREAD, receiver.is_null() ? (Klass*)NULL : receiver->klass()); LinkResolver::resolve_virtual_call( callinfo, receiver, recvrKlass, spec_klass, name, signature, KlassHandle(), false, true, CHECK); methodHandle method = callinfo.selected_method(); assert(method.not_null(), "should have thrown exception"); // Invoke the method JavaCalls::call(result, method, args, CHECK); } void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, TRAPS) { JavaCallArguments args(receiver); // One oop argument call_virtual(result, spec_klass, name, signature, &args, CHECK); } void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { JavaCallArguments args(receiver); // One oop argument args.push_oop(arg1); call_virtual(result, spec_klass, name, signature, &args, CHECK); } void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { JavaCallArguments args(receiver); // One oop argument args.push_oop(arg1); args.push_oop(arg2); call_virtual(result, spec_klass, name, signature, &args, CHECK); } // ============ Special calls ============ void JavaCalls::call_special(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { CallInfo callinfo; LinkResolver::resolve_special_call(callinfo, args->receiver(), klass, name, signature, KlassHandle(), false, CHECK); methodHandle method = callinfo.selected_method(); assert(method.not_null(), "should have thrown exception"); // Invoke the method JavaCalls::call(result, method, args, CHECK); } void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { JavaCallArguments args(receiver); // One oop argument call_special(result, klass, name, signature, &args, CHECK); } void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { JavaCallArguments args(receiver); // One oop argument args.push_oop(arg1); call_special(result, klass, name, signature, &args, CHECK); } void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { JavaCallArguments args(receiver); // One oop argument args.push_oop(arg1); args.push_oop(arg2); call_special(result, klass, name, signature, &args, CHECK); } // ============ Static calls ============ void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { CallInfo callinfo; LinkResolver::resolve_static_call(callinfo, klass, name, signature, KlassHandle(), false, true, CHECK); methodHandle method = callinfo.selected_method(); assert(method.not_null(), "should have thrown exception"); // Invoke the method JavaCalls::call(result, method, args, CHECK); } void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) { JavaCallArguments args; // No argument call_static(result, klass, name, signature, &args, CHECK); } void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) { JavaCallArguments args(arg1); // One oop argument call_static(result, klass, name, signature, &args, CHECK); } void JavaCalls::call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) { JavaCallArguments args; // One oop argument args.push_oop(arg1); args.push_oop(arg2); call_static(result, klass, name, signature, &args, CHECK); } // ------------------------------------------------- // Implementation of JavaCalls (low level) void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) { // Check if we need to wrap a potential OS exception handler around thread // This is used for e.g. Win32 structured exception handlers assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls"); // Need to wrap each and everytime, since there might be native code down the // stack that has installed its own exception handlers os::os_exception_wrapper(call_helper, result, &method, args, THREAD); } void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) { // During dumping, Java execution environment is not fully initialized. Also, Java execution // may cause undesirable side-effects in the class metadata. assert(!DumpSharedSpaces, "must not execute Java bytecodes when dumping"); methodHandle method = *m; JavaThread* thread = (JavaThread*)THREAD; assert(thread->is_Java_thread(), "must be called by a java thread"); assert(method.not_null(), "must have a method to call"); assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation"); assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here"); CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();) // Verify the arguments if (CheckJNICalls) { args->verify(method, result->get_type()); } else debug_only(args->verify(method, result->get_type())); // Ignore call if method is empty if (method->is_empty_method()) { assert(result->get_type() == T_VOID, "an empty method must return a void value"); return; } #ifdef ASSERT { InstanceKlass* holder = method->method_holder(); // A klass might not be initialized since JavaCall's might be used during the executing of // the . For example, a Thread.start might start executing on an object that is // not fully initialized! (bad Java programming style) assert(holder->is_linked(), "rewritting must have taken place"); } #endif assert(!thread->is_Compiler_thread(), "cannot compile from the compiler"); if (CompilationPolicy::must_be_compiled(method)) { CompileBroker::compile_method(method, InvocationEntryBci, CompilationPolicy::policy()->initial_compile_level(), methodHandle(), 0, "must_be_compiled", CHECK); } // Since the call stub sets up like the interpreter we call the from_interpreted_entry // so we can go compiled via a i2c. Otherwise initial entry method will always // run interpreted. address entry_point = method->from_interpreted_entry(); if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) { entry_point = method->interpreter_entry(); } // Figure out if the result value is an oop or not (Note: This is a different value // than result_type. result_type will be T_INT of oops. (it is about size) BasicType result_type = runtime_type_from(result); bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY); // NOTE: if we move the computation of the result_val_address inside // the call to call_stub, the optimizer produces wrong code. intptr_t* result_val_address = (intptr_t*)(result->get_value_addr()); // Find receiver Handle receiver = (!method->is_static()) ? args->receiver() : Handle(); // When we reenter Java, we need to reenable the yellow zone which // might already be disabled when we are in VM. if (thread->stack_yellow_zone_disabled()) { thread->reguard_stack(); } // Check that there are shadow pages available before changing thread state // to Java if (!os::stack_shadow_pages_available(THREAD, method)) { // Throw stack overflow exception with preinitialized exception. Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method); return; } else { // Touch pages checked if the OS needs them to be touched to be mapped. os::bang_stack_shadow_pages(); } // do call { JavaCallWrapper link(method, receiver, result, CHECK); { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner StubRoutines::call_stub()( (address)&link, // (intptr_t*)&(result->_value), // see NOTE above (compiler problem) result_val_address, // see NOTE above (compiler problem) result_type, method(), entry_point, args->parameters(), args->size_of_parameters(), CHECK ); result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call) // Preserve oop return value across possible gc points if (oop_result_flag) { thread->set_vm_result((oop) result->get_jobject()); } } } // Exit JavaCallWrapper (can block - potential return oop must be preserved) // Check if a thread stop or suspend should be executed // The following assert was not realistic. Thread.stop can set that bit at any moment. //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed"); // Restore possible oop return if (oop_result_flag) { result->set_jobject((jobject)thread->vm_result()); thread->set_vm_result(NULL); } } //-------------------------------------------------------------------------------------- // Implementation of JavaCallArguments inline bool is_value_state_indirect_oop(uint state) { assert(state != JavaCallArguments::value_state_oop, "Checking for handles after removal"); assert(state < JavaCallArguments::value_state_limit, "Invalid value state"); return state != JavaCallArguments::value_state_primitive; } inline oop resolve_indirect_oop(intptr_t value, uint state) { switch (state) { case JavaCallArguments::value_state_handle: { oop* ptr = reinterpret_cast(value); return Handle::raw_resolve(ptr); } case JavaCallArguments::value_state_jobject: { jobject obj = reinterpret_cast(value); return JNIHandles::resolve(obj); } default: ShouldNotReachHere(); return NULL; } } intptr_t* JavaCallArguments::parameters() { // First convert all handles to oops for(int i = 0; i < _size; i++) { 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(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"); } else { guarantee(state == JavaCallArguments::value_state_primitive, "signature does not match pushed arguments"); } } 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"); // Verify the pointee. oop vv = resolve_indirect_oop(v, _value_state[_pos]); guarantee(vv->is_oop_or_null(true), "Bad JNI oop argument"); } 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(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(); }