1 /* 2 * Copyright (c) 1997, 2015, 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_STUBCODEGENERATOR_HPP 26 #define SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP 27 28 #include "asm/assembler.hpp" 29 #include "memory/allocation.hpp" 30 #include "runtime/orderAccess.hpp" 31 32 // All the basic framework for stub code generation/debugging/printing. 33 34 35 // A StubCodeDesc describes a piece of generated code (usually stubs). 36 // This information is mainly useful for debugging and printing. 37 // Currently, code descriptors are simply chained in a linked list, 38 // this may have to change if searching becomes too slow. 39 40 class StubCodeDesc: public CHeapObj<mtCode> { 41 private: 42 static StubCodeDesc *volatile _list; // the list of all descriptors 43 static bool _frozen; // determines whether _list modifications are allowed 44 45 StubCodeDesc* _next; // the next element in the linked list 46 const char* _group; // the group to which the stub code belongs 47 const char* _name; // the name assigned to the stub code 48 address _begin; // points to the first byte of the stub code (included) 49 address _end; // points to the first byte after the stub code (excluded) 50 51 void set_end(address end) { 52 assert(_begin <= end, "begin & end not properly ordered"); 53 _end = end; 54 } 55 56 void set_begin(address begin) { 57 assert(begin >= _begin, "begin may not decrease"); 58 assert(_end == NULL || begin <= _end, "begin & end not properly ordered"); 59 _begin = begin; 60 } 61 62 friend class StubCodeMark; 63 friend class StubCodeGenerator; 64 65 public: 66 static StubCodeDesc* first() { return _list; } 67 static StubCodeDesc* next(StubCodeDesc* desc) { return desc->_next; } 68 69 static StubCodeDesc* desc_for(address pc); // returns the code descriptor for the code containing pc or NULL 70 static const char* name_for(address pc); // returns the name of the code containing pc or NULL 71 72 StubCodeDesc(const char* group, const char* name, address begin, address end = NULL) { 73 assert(!_frozen, "no modifications allowed"); 74 assert(name != NULL, "no name specified"); 75 _next = _list; 76 _group = group; 77 _name = name; 78 _begin = begin; 79 _end = end; 80 OrderAccess::release_store(&_list, this); 81 }; 82 83 static void freeze(); 84 85 const char* group() const { return _group; } 86 const char* name() const { return _name; } 87 address begin() const { return _begin; } 88 address end() const { return _end; } 89 int size_in_bytes() const { return _end - _begin; } 90 bool contains(address pc) const { return _begin <= pc && pc < _end; } 91 void print_on(outputStream* st) const; 92 void print() const { print_on(tty); } 93 }; 94 95 // The base class for all stub-generating code generators. 96 // Provides utility functions. 97 98 class StubCodeGenerator: public StackObj { 99 private: 100 bool _print_code; 101 102 protected: 103 MacroAssembler* _masm; 104 105 public: 106 StubCodeGenerator(CodeBuffer* code, bool print_code = false); 107 ~StubCodeGenerator(); 108 109 MacroAssembler* assembler() const { return _masm; } 110 111 virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor 112 virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor 113 }; 114 115 116 // Stack-allocated helper class used to associate a stub code with a name. 117 // All stub code generating functions that use a StubCodeMark will be registered 118 // in the global StubCodeDesc list and the generated stub code can be identified 119 // later via an address pointing into it. 120 121 class StubCodeMark: public StackObj { 122 private: 123 StubCodeGenerator* _cgen; 124 StubCodeDesc* _cdesc; 125 126 public: 127 StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name); 128 ~StubCodeMark(); 129 130 }; 131 132 #endif // SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP