interpreter.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1997, 2007, 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 33class 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(); 56 57 // Interpreter-specific initialization 58 void initialize(const char* description, Bytecodes::Code bytecode); 59 60 // Interpreter-specific attributes 61 int code_size() const { return code_end() - code_begin(); } 62 const char* description() const { return _description; } 63 Bytecodes::Code bytecode() const { return _bytecode; } 64}; 65 66// Define a prototype interface 67DEF_STUB_INTERFACE(InterpreterCodelet); 68 69 70//------------------------------------------------------------------------------------------------------------------------ 71// A CodeletMark serves as an automatic creator/initializer for Codelets 72// (As a subclass of ResourceMark it automatically GC's the allocated 73// code buffer and assemblers). 74 75class CodeletMark: ResourceMark { 76 private: 77 InterpreterCodelet* _clet; 78 InterpreterMacroAssembler** _masm; 79 CodeBuffer _cb; 80 81 int codelet_size() { 82 // Request the whole code buffer (minus a little for alignment). 83 // The commit call below trims it back for each codelet. 84 int codelet_size = AbstractInterpreter::code()->available_space() - 2*K; 85 86 // Guarantee there's a little bit of code space left. 87 guarantee (codelet_size > 0 && (size_t)codelet_size > 2*K, 88 "not enough space for interpreter generation"); 89 90 return codelet_size; 91 } 92 93 public: 94 CodeletMark( 95 InterpreterMacroAssembler*& masm, 96 const char* description, 97 Bytecodes::Code bytecode = Bytecodes::_illegal): 98 _clet((InterpreterCodelet*)AbstractInterpreter::code()->request(codelet_size())), 99 _cb(_clet->code_begin(), _clet->code_size()) 100 101 { // request all space (add some slack for Codelet data) 102 assert (_clet != NULL, "we checked not enough space already"); 103 104 // initialize Codelet attributes 105 _clet->initialize(description, bytecode); 106 // create assembler for code generation 107 masm = new InterpreterMacroAssembler(&_cb); 108 _masm = &masm; 109 } 110 111 ~CodeletMark() { 112 // align so printing shows nop's instead of random code at the end (Codelets are aligned) 113 (*_masm)->align(wordSize); 114 // make sure all code is in code buffer 115 (*_masm)->flush(); 116 117 118 // commit Codelet 119 AbstractInterpreter::code()->commit((*_masm)->code()->pure_code_size()); 120 // make sure nobody can use _masm outside a CodeletMark lifespan 121 *_masm = NULL; 122 } 123}; 124 125// Wrapper classes to produce Interpreter/InterpreterGenerator from either 126// the c++ interpreter or the template interpreter. 127 128class Interpreter: public CC_INTERP_ONLY(CppInterpreter) NOT_CC_INTERP(TemplateInterpreter) { 129 130 public: 131 // Debugging/printing 132 static InterpreterCodelet* codelet_containing(address pc) { return (InterpreterCodelet*)_code->stub_containing(pc); } 133#include "incls/_interpreter_pd.hpp.incl" 134}; 135