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1 /* |
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 * |
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23 */ |
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24 |
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25 // This file contains the platform-independant parts |
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26 // of the interpreter and the interpreter generator. |
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27 |
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28 //------------------------------------------------------------------------------------------------------------------------ |
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29 // An InterpreterCodelet is a piece of interpreter code. All |
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30 // interpreter code is generated into little codelets which |
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31 // contain extra information for debugging and printing purposes. |
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32 |
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33 class InterpreterCodelet: public Stub { |
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34 friend class VMStructs; |
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35 private: |
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36 int _size; // the size in bytes |
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37 const char* _description; // a description of the codelet, for debugging & printing |
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38 Bytecodes::Code _bytecode; // associated bytecode if any |
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39 |
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40 public: |
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41 // Initialization/finalization |
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42 void initialize(int size) { _size = size; } |
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43 void finalize() { ShouldNotCallThis(); } |
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44 |
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45 // General info/converters |
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46 int size() const { return _size; } |
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47 static int code_size_to_size(int code_size) { return round_to(sizeof(InterpreterCodelet), CodeEntryAlignment) + code_size; } |
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48 |
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49 // Code info |
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50 address code_begin() const { return (address)this + round_to(sizeof(InterpreterCodelet), CodeEntryAlignment); } |
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51 address code_end() const { return (address)this + size(); } |
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52 |
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53 // Debugging |
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54 void verify(); |
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55 void print(); |
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56 |
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57 // Interpreter-specific initialization |
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58 void initialize(const char* description, Bytecodes::Code bytecode); |
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59 |
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60 // Interpreter-specific attributes |
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61 int code_size() const { return code_end() - code_begin(); } |
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62 const char* description() const { return _description; } |
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63 Bytecodes::Code bytecode() const { return _bytecode; } |
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64 }; |
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65 |
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66 // Define a prototype interface |
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67 DEF_STUB_INTERFACE(InterpreterCodelet); |
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68 |
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69 |
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70 //------------------------------------------------------------------------------------------------------------------------ |
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71 // A CodeletMark serves as an automatic creator/initializer for Codelets |
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72 // (As a subclass of ResourceMark it automatically GC's the allocated |
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73 // code buffer and assemblers). |
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74 |
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75 class CodeletMark: ResourceMark { |
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76 private: |
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77 InterpreterCodelet* _clet; |
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78 InterpreterMacroAssembler** _masm; |
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79 CodeBuffer _cb; |
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80 |
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81 int codelet_size() { |
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82 // Request the whole code buffer (minus a little for alignment). |
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83 // The commit call below trims it back for each codelet. |
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84 int codelet_size = AbstractInterpreter::code()->available_space() - 2*K; |
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85 |
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86 // Guarantee there's a little bit of code space left. |
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87 guarantee (codelet_size > 0 && (size_t)codelet_size > 2*K, |
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88 "not enough space for interpreter generation"); |
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89 |
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90 return codelet_size; |
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91 } |
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92 |
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93 public: |
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94 CodeletMark( |
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95 InterpreterMacroAssembler*& masm, |
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96 const char* description, |
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97 Bytecodes::Code bytecode = Bytecodes::_illegal): |
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98 _clet((InterpreterCodelet*)AbstractInterpreter::code()->request(codelet_size())), |
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99 _cb(_clet->code_begin(), _clet->code_size()) |
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100 |
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101 { // request all space (add some slack for Codelet data) |
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102 assert (_clet != NULL, "we checked not enough space already"); |
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103 |
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104 // initialize Codelet attributes |
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105 _clet->initialize(description, bytecode); |
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106 // create assembler for code generation |
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107 masm = new InterpreterMacroAssembler(&_cb); |
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108 _masm = &masm; |
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109 } |
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110 |
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111 ~CodeletMark() { |
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112 // align so printing shows nop's instead of random code at the end (Codelets are aligned) |
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113 (*_masm)->align(wordSize); |
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114 // make sure all code is in code buffer |
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115 (*_masm)->flush(); |
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116 |
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117 |
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118 // commit Codelet |
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119 AbstractInterpreter::code()->commit((*_masm)->code()->pure_code_size()); |
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120 // make sure nobody can use _masm outside a CodeletMark lifespan |
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121 *_masm = NULL; |
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122 } |
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123 }; |
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124 |
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125 // Wrapper classes to produce Interpreter/InterpreterGenerator from either |
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126 // the c++ interpreter or the template interpreter. |
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127 |
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128 class Interpreter: public CC_INTERP_ONLY(CppInterpreter) NOT_CC_INTERP(TemplateInterpreter) { |
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129 |
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130 public: |
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131 // Debugging/printing |
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132 static InterpreterCodelet* codelet_containing(address pc) { return (InterpreterCodelet*)_code->stub_containing(pc); } |
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133 #include "incls/_interpreter_pd.hpp.incl" |
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134 }; |