0 /* 1 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #ifndef SHARE_VM_CODE_ICBUFFER_HPP 25 #define SHARE_VM_CODE_ICBUFFER_HPP 26 27 #include "asm/codeBuffer.hpp" 28 #include "code/stubs.hpp" 29 #include "interpreter/bytecodes.hpp" 30 #include "memory/allocation.hpp" 31 #include "runtime/safepointVerifiers.hpp" 32 #include "utilities/align.hpp" 33 #include "utilities/debug.hpp" 34 #include "utilities/macros.hpp" 35 36 // 37 // For CompiledIC's: 38 // 39 // In cases where we do not have MT-safe state transformation, 40 // we go to a transition state, using ICStubs. At a safepoint, 41 // the inline caches are transferred from the transitional code: 42 // 43 // instruction_address --> 01 set xxx_oop, Ginline_cache_klass 44 // 23 jump_to Gtemp, yyyy 45 // 4 nop 46 47 class ICStub: public Stub { 48 private: 49 int _size; // total size of the stub incl. code 50 address _ic_site; // points at call instruction of owning ic-buffer 51 /* stub code follows here */ 52 protected: 53 friend class ICStubInterface; 54 // This will be called only by ICStubInterface 55 void initialize(int size, 56 CodeStrings strings) { _size = size; _ic_site = NULL; } 57 void finalize(); // called when a method is removed 58 59 // General info 60 int size() const { return _size; } 61 static int code_size_to_size(int code_size) { return align_up((int)sizeof(ICStub), CodeEntryAlignment) + code_size; } 62 63 public: 64 // Creation 65 void set_stub(CompiledIC *ic, void* cached_value, address dest_addr); 66 67 // Code info 68 address code_begin() const { return (address)this + align_up(sizeof(ICStub), CodeEntryAlignment); } 69 address code_end() const { return (address)this + size(); } 70 71 // Call site info 72 address ic_site() const { return _ic_site; } 73 void clear(); 74 bool is_empty() const { return _ic_site == NULL; } 75 76 // stub info 77 address destination() const; // destination of jump instruction 78 void* cached_value() const; // cached_value for stub 79 80 // Debugging 81 void verify() PRODUCT_RETURN; 82 void print() PRODUCT_RETURN; 83 84 // Creation 85 friend ICStub* ICStub_from_destination_address(address destination_address); 86 }; 87 88 // ICStub Creation 89 inline ICStub* ICStub_from_destination_address(address destination_address) { 90 ICStub* stub = (ICStub*) (destination_address - align_up(sizeof(ICStub), CodeEntryAlignment)); 91 #ifdef ASSERT 92 stub->verify(); 93 #endif 94 return stub; 95 } 96 97 #ifdef ASSERT 98 // The ICRefillVerifier class is a stack allocated RAII object used to 99 // detect if a failed IC transition that required IC stub refilling has 100 // been accidentally missed. It is up to the caller to in that case 101 // refill IC stubs. 102 class ICRefillVerifier: StackObj { 103 bool _refill_requested; 104 bool _refill_remembered; 105 106 public: 107 ICRefillVerifier(); 108 ~ICRefillVerifier(); 109 110 void request_refill() { _refill_requested = true; } 111 void request_remembered() { _refill_remembered = true; } 112 }; 113 114 // The ICRefillVerifierMark is used to set the thread's current 115 // ICRefillVerifier to a provided one. This is useful in particular 116 // when transitioning IC stubs in parallel and refilling from the 117 // master thread invoking the IC stub transitioning code. 118 class ICRefillVerifierMark: StackObj { 119 public: 120 ICRefillVerifierMark(ICRefillVerifier* verifier); 121 ~ICRefillVerifierMark(); 122 }; 123 #endif 124 125 class InlineCacheBuffer: public AllStatic { 126 private: 127 // friends 128 friend class ICStub; 129 130 static int ic_stub_code_size(); 131 132 static StubQueue* _buffer; 133 134 static CompiledICHolder* _pending_released; 135 static int _pending_count; 136 137 static StubQueue* buffer() { return _buffer; } 138 139 static ICStub* new_ic_stub(); 140 141 // Machine-dependent implementation of ICBuffer 142 static void assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point); 143 static address ic_buffer_entry_point (address code_begin); 144 static void* ic_buffer_cached_value (address code_begin); 145 146 public: 147 148 // Initialization; must be called before first usage 149 static void initialize(); 150 151 // Access 152 static bool contains(address instruction_address); 153 154 // removes the ICStubs after backpatching 155 static void update_inline_caches(); 156 static void refill_ic_stubs(); 157 158 // for debugging 159 static bool is_empty(); 160 161 static void release_pending_icholders(); 162 static void queue_for_release(CompiledICHolder* icholder); 163 static int pending_icholder_count() { return _pending_count; } 164 165 // New interface 166 static bool create_transition_stub(CompiledIC *ic, void* cached_value, address entry); 167 static address ic_destination_for(CompiledIC *ic); 168 static void* cached_value_for(CompiledIC *ic); 169 }; 170 171 #endif // SHARE_VM_CODE_ICBUFFER_HPP --- EOF ---