1 /* 2 * Copyright (c) 2022, 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 #include "asm/assembler.hpp" 26 #include "asm/codeBuffer.hpp" 27 #include "memory/allocation.hpp" 28 #include "opto/c2_MacroAssembler.hpp" 29 #include "utilities/growableArray.hpp" 30 31 #ifndef SHARE_OPTO_C2_CODESTUBS_HPP 32 #define SHARE_OPTO_C2_CODESTUBS_HPP 33 34 class C2CodeStub : public ArenaObj { 35 private: 36 Label _entry; 37 Label _continuation; 38 39 protected: 40 C2CodeStub() : 41 _entry(), 42 _continuation() {} 43 44 public: 45 Label& entry() { return _entry; } 46 Label& continuation() { return _continuation; } 47 48 virtual void emit(C2_MacroAssembler& masm) = 0; 49 virtual int max_size() const = 0; 50 }; 51 52 class C2CodeStubList { 53 private: 54 GrowableArray<C2CodeStub*> _stubs; 55 56 public: 57 C2CodeStubList(); 58 59 void add_stub(C2CodeStub* stub) { _stubs.append(stub); } 60 void emit(CodeBuffer& cb); 61 }; 62 63 class C2SafepointPollStub : public C2CodeStub { 64 private: 65 uintptr_t _safepoint_offset; 66 67 public: 68 C2SafepointPollStub(uintptr_t safepoint_offset) : 69 _safepoint_offset(safepoint_offset) {} 70 int max_size() const; 71 void emit(C2_MacroAssembler& masm); 72 }; 73 74 // We move non-hot code of the nmethod entry barrier to an out-of-line stub 75 class C2EntryBarrierStub: public C2CodeStub { 76 private: 77 Label _guard; // Used on AArch64 and RISCV 78 79 public: 80 C2EntryBarrierStub() : C2CodeStub(), 81 _guard() {} 82 83 Label& guard() { return _guard; } 84 85 int max_size() const; 86 void emit(C2_MacroAssembler& masm); 87 }; 88 89 #ifdef _LP64 90 class C2HandleAnonOMOwnerStub : public C2CodeStub { 91 private: 92 Register _monitor; 93 Register _tmp; 94 public: 95 C2HandleAnonOMOwnerStub(Register monitor, Register tmp = noreg) : C2CodeStub(), 96 _monitor(monitor), _tmp(tmp) {} 97 Register monitor() { return _monitor; } 98 Register tmp() { return _tmp; } 99 int max_size() const; 100 void emit(C2_MacroAssembler& masm); 101 }; 102 #endif 103 104 #endif // SHARE_OPTO_C2_CODESTUBS_HPP