--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/javaCalls.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,606 @@
+/*
+ * 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();
+}