diff -r 000000000000 -r f90c822e73f8 src/share/vm/runtime/javaCalls.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/javaCalls.cpp Wed Apr 27 01:25:04 2016 +0800 @@ -0,0 +1,549 @@ +/* + * Copyright (c) 1997, 2013, 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(); + } +} + + +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, 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) { + 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(), thread); + } + else debug_only(args->verify(method, result->get_type(), thread)); + + // 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 + +intptr_t* JavaCallArguments::parameters() { + // First convert all handles to oops + for(int i = 0; i < _size; i++) { + if (_is_oop[i]) { + // Handle conversion + _value[i] = cast_from_oop(Handle::raw_resolve((oop *)_value[i])); + } + } + // Return argument vector + return _value; +} + + +class SignatureChekker : public SignatureIterator { + private: + bool *_is_oop; + int _pos; + BasicType _return_type; + intptr_t* _value; + Thread* _thread; + + public: + bool _is_return; + + SignatureChekker(Symbol* signature, BasicType return_type, bool is_static, bool* is_oop, intptr_t* value, Thread* thread) : SignatureIterator(signature) { + _is_oop = is_oop; + _is_return = false; + _return_type = return_type; + _pos = 0; + _value = value; + _thread = thread; + + if (!is_static) { + check_value(true); // Receiver must be an oop + } + } + + void check_value(bool type) { + guarantee(_is_oop[_pos++] == type, "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; + } + + // verify handle and the oop pointed to by handle + int p = _pos; + bool bad = false; + // If argument is oop + if (_is_oop[p]) { + intptr_t v = _value[p]; + if (v != 0 ) { + size_t t = (size_t)v; + bad = (t < (size_t)os::vm_page_size() ) || !Handle::raw_resolve((oop *)v)->is_oop_or_null(true); + if (CheckJNICalls && bad) { + ReportJNIFatalError((JavaThread*)_thread, "Bad JNI oop argument"); + } + } + // for the regular debug case. + assert(!bad, "Bad JNI oop argument"); + } + + check_value(true); + } + + 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, + Thread *thread) { + 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(),_is_oop, _value, thread); + sc.iterate_parameters(); + sc.check_doing_return(true); + sc.iterate_returntype(); +}