1 /* 2 * Copyright (c) 2018, 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 25 #ifndef SHARE_VM_RUNTIME_CONTINUATION_HPP 26 #define SHARE_VM_RUNTIME_CONTINUATION_HPP 27 28 #include "runtime/globals.hpp" 29 30 #define CONT_FULL_STACK (!UseNewCode) 31 32 // The order of this struct matters as it's directly manipulated by assembly code (push/pop) 33 struct FrameInfo { 34 address pc; 35 intptr_t* fp; 36 intptr_t* sp; 37 }; 38 39 class Continuation : AllStatic { 40 private: 41 static Method* _entry_method; 42 static Method* entry_method(Thread*); 43 44 public: 45 static void freeze(JavaThread* thread, FrameInfo* fi, int scopes); 46 static int prepare_thaw(FrameInfo* fi, bool return_barrier); 47 static void thaw(FrameInfo* fi, bool return_barrier); 48 49 static bool is_continuation_entry_frame(const frame& f); 50 static bool is_cont_bottom_frame(const frame& f); 51 static bool is_return_barrier_entry(const address pc); 52 static address sender_pc_past_barrier(JavaThread* thread, const frame& f); 53 static address get_entry_pc_past_barrier(JavaThread* thread, const frame& f); 54 static frame fix_continuation_bottom_sender(const frame& callee, frame f, RegisterMap* map); 55 }; 56 57 void CONT_RegisterNativeMethods(JNIEnv *env, jclass cls); 58 59 #endif // SHARE_VM_RUNTIME_CONTINUATION_HPP