1 /*
 2  * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 #ifndef SHARE_VM_PRIMS_UNIVERSALUPCALLHANDLER_HPP
25 #define SHARE_VM_PRIMS_UNIVERSALUPCALLHANDLER_HPP
26 
27 #include "asm/codeBuffer.hpp"
28 #include "code/codeBlob.hpp"
29 #include "prims/foreign_globals.hpp"
30 
31 class JavaThread;
32 
33 class ProgrammableUpcallHandler {
34 private:
35   static constexpr CodeBuffer::csize_t upcall_stub_size = 1024;
36 
37   struct UpcallMethod {
38     Klass* klass;
39     Symbol* name;
40     Symbol* sig;
41   } upcall_method;
42 
43   ProgrammableUpcallHandler();
44 
45   static const ProgrammableUpcallHandler& instance();
46 
47   static void upcall_helper(JavaThread* thread, jobject rec, address buff);
48   static void attach_thread_and_do_upcall(jobject rec, address buff);
49 
50   static void handle_uncaught_exception(oop exception);
51   static JavaThread* maybe_attach_and_get_thread(bool* should_detach);
52   static void detach_current_thread();
53 
54   static JavaThread* on_entry(OptimizedEntryBlob::FrameData* context);
55   static void on_exit(OptimizedEntryBlob::FrameData* context);
56 public:
57   static address generate_optimized_upcall_stub(jobject mh, Method* entry, jobject jabi, jobject jconv);
58   static address generate_upcall_stub(jobject rec, jobject abi, jobject buffer_layout);
59   static bool supports_optimized_upcalls();
60 };
61 
62 #endif // SHARE_VM_PRIMS_UNIVERSALUPCALLHANDLER_HPP