| /* |
| * 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/os.inline.hpp" |
| #include "runtime/signature.hpp" |
| #include "runtime/stubRoutines.hpp" |
| #include "runtime/thread.inline.hpp" |
| #if INCLUDE_JVMCI |
| #include "jvmci/jvmciJavaClasses.hpp" |
| #include "jvmci/jvmciRuntime.hpp" |
| #endif |
| |
| // ----------------------------------------------------- |
| // Implementation of JavaCallWrapper |
| |
| JavaCallWrapper::JavaCallWrapper(const 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->can_call_java(), "cannot make java calls from the native 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(); |
| } |
| } |
| |
| |
| 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 |
| default: |
| ShouldNotReachHere(); |
| return T_ILLEGAL; |
| } |
| } |
| |
| // ============ Virtual calls ============ |
| |
| void JavaCalls::call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { |
| CallInfo callinfo; |
| Handle receiver = args->receiver(); |
| Klass* recvrKlass = receiver.is_null() ? (Klass*)NULL : receiver->klass(); |
| LinkInfo link_info(spec_klass, name, signature); |
| LinkResolver::resolve_virtual_call( |
| callinfo, receiver, recvrKlass, link_info, 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, Klass* 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, Klass* 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, Klass* 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, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { |
| CallInfo callinfo; |
| LinkInfo link_info(klass, name, signature); |
| LinkResolver::resolve_special_call(callinfo, args->receiver(), link_info, 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, Klass* 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, Klass* 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, Klass* 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, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) { |
| CallInfo callinfo; |
| LinkInfo link_info(klass, name, signature); |
| LinkResolver::resolve_static_call(callinfo, link_info, 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, Klass* klass, Symbol* name, Symbol* signature, TRAPS) { |
| JavaCallArguments args; // No argument |
| call_static(result, klass, name, signature, &args, CHECK); |
| } |
| |
| |
| void JavaCalls::call_static(JavaValue* result, Klass* 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, Klass* 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); |
| } |
| |
| |
| void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS) { |
| JavaCallArguments args; // One oop argument |
| args.push_oop(arg1); |
| args.push_oop(arg2); |
| args.push_oop(arg3); |
| call_static(result, klass, name, signature, &args, CHECK); |
| } |
| |
| // ------------------------------------------------- |
| // Implementation of JavaCalls (low level) |
| |
| |
| void JavaCalls::call(JavaValue* result, const 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 every time, 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, const methodHandle& method, JavaCallArguments* args, TRAPS) { |
| |
| 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();) |
| |
| #if INCLUDE_JVMCI |
| // Gets the nmethod (if any) that should be called instead of normal target |
| nmethod* alternative_target = args->alternative_target(); |
| if (alternative_target == NULL) { |
| #endif |
| // Verify the arguments |
| |
| if (CheckJNICalls) { |
| args->verify(method, result->get_type()); |
| } |
| else debug_only(args->verify(method, result->get_type())); |
| #if INCLUDE_JVMCI |
| } |
| #else |
| |
| // 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; |
| } |
| #endif |
| |
| #ifdef ASSERT |
| { InstanceKlass* holder = method->method_holder(); |
| // A klass might not be initialized since JavaCall's might be used during the executing of |
| // the <clinit>. For example, a Thread.start might start executing on an object that is |
| // not fully initialized! (bad Java programming style) |
| assert(holder->is_linked(), "rewriting must have taken place"); |
| } |
| #endif |
| |
| CompilationPolicy::compile_if_required(method, 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 reserved/yellow zone which |
| // might already be disabled when we are in VM. |
| if (!thread->stack_guards_enabled()) { |
| thread->reguard_stack(); |
| } |
| |
| // Check that there are shadow pages available before changing thread state |
| // to Java. Calculate current_stack_pointer here to make sure |
| // stack_shadow_pages_available() and bang_stack_shadow_pages() use the same sp. |
| address sp = os::current_stack_pointer(); |
| if (!os::stack_shadow_pages_available(THREAD, method, sp)) { |
| // 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::map_stack_shadow_pages(sp); |
| } |
| |
| #if INCLUDE_JVMCI |
| if (alternative_target != NULL) { |
| if (alternative_target->is_alive()) { |
| thread->set_jvmci_alternate_call_target(alternative_target->verified_entry_point()); |
| entry_point = method->adapter()->get_i2c_entry(); |
| } else { |
| THROW(vmSymbols::jdk_vm_ci_code_InvalidInstalledCodeException()); |
| } |
| } |
| #endif |
| |
| // 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 %u", 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<oop*>(value); |
| return Handle::raw_resolve(ptr); |
| } |
| |
| case JavaCallArguments::value_state_jobject: |
| { |
| jobject obj = reinterpret_cast<jobject>(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<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(); |
| } |