1 /* 2 * Copyright (c) 1997, 2013, 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_CODE_ICBUFFER_HPP 26 #define SHARE_VM_CODE_ICBUFFER_HPP 27 28 #include "asm/codeBuffer.hpp" 29 #include "code/stubs.hpp" 30 #include "interpreter/bytecodes.hpp" 31 #include "memory/allocation.hpp" 32 #include "utilities/align.hpp" 33 34 // 35 // For CompiledIC's: 36 // 37 // In cases where we do not have MT-safe state transformation, 38 // we go to a transition state, using ICStubs. At a safepoint, 39 // the inline caches are transferred from the transitional code: 40 // 41 // instruction_address --> 01 set xxx_oop, Ginline_cache_klass 42 // 23 jump_to Gtemp, yyyy 43 // 4 nop 44 45 class ICStub: public Stub { 46 private: 47 int _size; // total size of the stub incl. code 48 address _ic_site; // points at call instruction of owning ic-buffer 49 /* stub code follows here */ 50 protected: 51 friend class ICStubInterface; 52 // This will be called only by ICStubInterface 53 void initialize(int size, 54 CodeStrings strings) { _size = size; _ic_site = NULL; } 55 void finalize(); // called when a method is removed 56 57 // General info 58 int size() const { return _size; } 59 static int code_size_to_size(int code_size) { return align_up((int)sizeof(ICStub), CodeEntryAlignment) + code_size; } 60 61 public: 62 // Creation 63 void set_stub(CompiledIC *ic, void* cached_value, address dest_addr); 64 65 // Code info 66 address code_begin() const { return (address)this + align_up(sizeof(ICStub), CodeEntryAlignment); } 67 address code_end() const { return (address)this + size(); } 68 69 // Call site info 70 address ic_site() const { return _ic_site; } 71 void clear(); 72 bool is_empty() const { return _ic_site == NULL; } 73 74 // stub info 75 address destination() const; // destination of jump instruction 76 void* cached_value() const; // cached_value for stub 77 78 // Debugging 79 void verify() PRODUCT_RETURN; 80 void print() PRODUCT_RETURN; 81 82 // Creation 83 friend ICStub* ICStub_from_destination_address(address destination_address); 84 }; 85 86 // ICStub Creation 87 inline ICStub* ICStub_from_destination_address(address destination_address) { 88 ICStub* stub = (ICStub*) (destination_address - align_up(sizeof(ICStub), CodeEntryAlignment)); 89 #ifdef ASSERT 90 stub->verify(); 91 #endif 92 return stub; 93 } 94 95 class InlineCacheBuffer: public AllStatic { 96 private: 97 // friends 98 friend class ICStub; 99 100 static int ic_stub_code_size(); 101 102 static StubQueue* _buffer; 103 static ICStub* _next_stub; 104 105 static CompiledICHolder* _pending_released; 106 static int _pending_count; 107 108 static StubQueue* buffer() { return _buffer; } 109 static void set_next_stub(ICStub* next_stub) { _next_stub = next_stub; } 110 static ICStub* get_next_stub() { return _next_stub; } 111 112 static void init_next_stub(); 113 114 static ICStub* new_ic_stub(); 115 116 117 // Machine-dependent implementation of ICBuffer 118 static void assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point); 119 static address ic_buffer_entry_point (address code_begin); 120 static void* ic_buffer_cached_value (address code_begin); 121 122 public: 123 124 // Initialization; must be called before first usage 125 static void initialize(); 126 127 // Access 128 static bool contains(address instruction_address); 129 130 // removes the ICStubs after backpatching 131 static void update_inline_caches(); 132 133 // for debugging 134 static bool is_empty(); 135 136 static void release_pending_icholders(); 137 static void queue_for_release(CompiledICHolder* icholder); 138 static int pending_icholder_count() { return _pending_count; } 139 140 // New interface 141 static void create_transition_stub(CompiledIC *ic, void* cached_value, address entry); 142 static address ic_destination_for(CompiledIC *ic); 143 static void* cached_value_for(CompiledIC *ic); 144 }; 145 146 #endif // SHARE_VM_CODE_ICBUFFER_HPP