1 /* 2 * Copyright (c) 1997, 2010, 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 // This file contains the platform-independent parts 26 // of the interpreter and the interpreter generator. 27 28 //------------------------------------------------------------------------------------------------------------------------ 29 // An InterpreterCodelet is a piece of interpreter code. All 30 // interpreter code is generated into little codelets which 31 // contain extra information for debugging and printing purposes. 32 33 class InterpreterCodelet: public Stub { 34 friend class VMStructs; 35 private: 36 int _size; // the size in bytes 37 const char* _description; // a description of the codelet, for debugging & printing 38 Bytecodes::Code _bytecode; // associated bytecode if any 39 40 public: 41 // Initialization/finalization 42 void initialize(int size) { _size = size; } 43 void finalize() { ShouldNotCallThis(); } 44 45 // General info/converters 46 int size() const { return _size; } 47 static int code_size_to_size(int code_size) { return round_to(sizeof(InterpreterCodelet), CodeEntryAlignment) + code_size; } 48 49 // Code info 50 address code_begin() const { return (address)this + round_to(sizeof(InterpreterCodelet), CodeEntryAlignment); } 51 address code_end() const { return (address)this + size(); } 52 53 // Debugging 54 void verify(); 55 void print_on(outputStream* st) const; 56 void print() const { print_on(tty); } 57 58 // Interpreter-specific initialization 59 void initialize(const char* description, Bytecodes::Code bytecode); 60 61 // Interpreter-specific attributes 62 int code_size() const { return code_end() - code_begin(); } 63 const char* description() const { return _description; } 64 Bytecodes::Code bytecode() const { return _bytecode; } 65 }; 66 67 // Define a prototype interface 68 DEF_STUB_INTERFACE(InterpreterCodelet); 69 70 71 //------------------------------------------------------------------------------------------------------------------------ 72 // A CodeletMark serves as an automatic creator/initializer for Codelets 73 // (As a subclass of ResourceMark it automatically GC's the allocated 74 // code buffer and assemblers). 75 76 class CodeletMark: ResourceMark { 77 private: 78 InterpreterCodelet* _clet; 79 InterpreterMacroAssembler** _masm; 80 CodeBuffer _cb; 81 82 int codelet_size() { 83 // Request the whole code buffer (minus a little for alignment). 84 // The commit call below trims it back for each codelet. 85 int codelet_size = AbstractInterpreter::code()->available_space() - 2*K; 86 87 // Guarantee there's a little bit of code space left. 88 guarantee (codelet_size > 0 && (size_t)codelet_size > 2*K, 89 "not enough space for interpreter generation"); 90 91 return codelet_size; 92 } 93 94 public: 95 CodeletMark( 96 InterpreterMacroAssembler*& masm, 97 const char* description, 98 Bytecodes::Code bytecode = Bytecodes::_illegal): 99 _clet((InterpreterCodelet*)AbstractInterpreter::code()->request(codelet_size())), 100 _cb(_clet->code_begin(), _clet->code_size()) 101 102 { // request all space (add some slack for Codelet data) 103 assert (_clet != NULL, "we checked not enough space already"); 104 105 // initialize Codelet attributes 106 _clet->initialize(description, bytecode); 107 // create assembler for code generation 108 masm = new InterpreterMacroAssembler(&_cb); 109 _masm = &masm; 110 } 111 112 ~CodeletMark() { 113 // align so printing shows nop's instead of random code at the end (Codelets are aligned) 114 (*_masm)->align(wordSize); 115 // make sure all code is in code buffer 116 (*_masm)->flush(); 117 118 119 // commit Codelet 120 AbstractInterpreter::code()->commit((*_masm)->code()->pure_insts_size()); 121 // make sure nobody can use _masm outside a CodeletMark lifespan 122 *_masm = NULL; 123 } 124 }; 125 126 // Wrapper classes to produce Interpreter/InterpreterGenerator from either 127 // the c++ interpreter or the template interpreter. 128 129 class Interpreter: public CC_INTERP_ONLY(CppInterpreter) NOT_CC_INTERP(TemplateInterpreter) { 130 131 public: 132 // Debugging/printing 133 static InterpreterCodelet* codelet_containing(address pc) { return (InterpreterCodelet*)_code->stub_containing(pc); } 134 #include "incls/_interpreter_pd.hpp.incl" 135 };