1 /*
2 * Copyright (c) 2018, 2023, 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 *
30 #include "oops/oopsHierarchy.hpp"
31
32 class ContinuationEntry;
33 class frame;
34 class FrameValues;
35 class Handle;
36 class outputStream;
37 class RegisterMap;
38
39 class Continuations : public AllStatic {
40 public:
41 static void init();
42 static bool enabled();
43 };
44
45 void continuations_init();
46
47 class javaVFrame;
48 class JavaThread;
49
50 class Continuation : AllStatic {
51 public:
52
53 enum thaw_kind {
54 thaw_top = 0,
55 thaw_return_barrier = 1,
56 thaw_return_barrier_exception = 2,
57 };
58
59 static bool is_thaw_return_barrier(thaw_kind kind) {
60 return kind != thaw_top;
61 }
62
63 static bool is_thaw_return_barrier_exception(thaw_kind kind) {
64 bool r = (kind == thaw_return_barrier_exception);
65 assert(!r || is_thaw_return_barrier(kind), "must be");
66 return r;
67 }
68
69 static void init();
70
71 static address freeze_entry();
72 static int prepare_thaw(JavaThread* thread, bool return_barrier);
73 static address thaw_entry();
74
75 static ContinuationEntry* get_continuation_entry_for_continuation(JavaThread* thread, oop continuation);
76 static ContinuationEntry* get_continuation_entry_for_sp(JavaThread* thread, intptr_t* const sp);
77 static ContinuationEntry* get_continuation_entry_for_entry_frame(JavaThread* thread, const frame& f);
78
79 static bool is_continuation_mounted(JavaThread* thread, oop continuation);
80
81 static bool is_cont_barrier_frame(const frame& f);
82 static bool is_return_barrier_entry(const address pc);
83 static bool is_continuation_enterSpecial(const frame& f);
84 static bool is_continuation_entry_frame(const frame& f, const RegisterMap *map);
85
86 static bool is_frame_in_continuation(const ContinuationEntry* entry, const frame& f);
87 static bool is_frame_in_continuation(JavaThread* thread, const frame& f);
88
89 static bool has_last_Java_frame(oop continuation, frame* frame, RegisterMap* map);
90 static frame last_frame(oop continuation, RegisterMap *map);
91 static frame top_frame(const frame& callee, RegisterMap* map);
92 static javaVFrame* last_java_vframe(Handle continuation, RegisterMap *map);
93 static frame continuation_parent_frame(RegisterMap* map);
94
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1 /*
2 * Copyright (c) 2018, 2024, 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 *
30 #include "oops/oopsHierarchy.hpp"
31
32 class ContinuationEntry;
33 class frame;
34 class FrameValues;
35 class Handle;
36 class outputStream;
37 class RegisterMap;
38
39 class Continuations : public AllStatic {
40 public:
41 static void init();
42 static bool enabled();
43 };
44
45 void continuations_init();
46
47 class javaVFrame;
48 class JavaThread;
49
50 // should match Continuation.toPreemptStatus() in Continuation.java
51 enum freeze_result {
52 freeze_ok = 0,
53 freeze_ok_bottom = 1,
54 freeze_pinned_cs = 2,
55 freeze_pinned_native = 3,
56 freeze_pinned_monitor = 4,
57 freeze_exception = 5,
58 freeze_not_mounted = 6,
59 freeze_unsupported = 7
60 };
61
62 class Continuation : AllStatic {
63 public:
64
65 enum preempt_kind {
66 freeze_on_monitorenter = 1,
67 freeze_on_wait = 2
68 };
69
70 enum thaw_kind {
71 thaw_top = 0,
72 thaw_return_barrier = 1,
73 thaw_return_barrier_exception = 2,
74 };
75
76 static bool is_thaw_return_barrier(thaw_kind kind) {
77 return kind != thaw_top;
78 }
79
80 static bool is_thaw_return_barrier_exception(thaw_kind kind) {
81 bool r = (kind == thaw_return_barrier_exception);
82 assert(!r || is_thaw_return_barrier(kind), "must be");
83 return r;
84 }
85
86 static void init();
87
88 static address freeze_entry();
89 static address freeze_preempt_entry();
90 static int prepare_thaw(JavaThread* thread, bool return_barrier);
91 static address thaw_entry();
92
93 static int try_preempt(JavaThread* target, oop continuation, preempt_kind preempt_kind) NOT_LOOM_MONITOR_SUPPORT({ return freeze_unsupported; });
94
95 static ContinuationEntry* get_continuation_entry_for_continuation(JavaThread* thread, oop continuation);
96 static ContinuationEntry* get_continuation_entry_for_sp(JavaThread* thread, intptr_t* const sp);
97 static ContinuationEntry* get_continuation_entry_for_entry_frame(JavaThread* thread, const frame& f);
98
99 static bool is_continuation_mounted(JavaThread* thread, oop continuation);
100
101 static bool is_cont_barrier_frame(const frame& f);
102 static bool is_return_barrier_entry(const address pc);
103 static bool is_continuation_enterSpecial(const frame& f);
104 static bool is_continuation_entry_frame(const frame& f, const RegisterMap *map);
105
106 static bool is_frame_in_continuation(const ContinuationEntry* entry, const frame& f);
107 static bool is_frame_in_continuation(JavaThread* thread, const frame& f);
108
109 static bool has_last_Java_frame(oop continuation, frame* frame, RegisterMap* map);
110 static frame last_frame(oop continuation, RegisterMap *map);
111 static frame top_frame(const frame& callee, RegisterMap* map);
112 static javaVFrame* last_java_vframe(Handle continuation, RegisterMap *map);
113 static frame continuation_parent_frame(RegisterMap* map);
114
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