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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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605
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25 // This file contains the platform-independent parts
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0
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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 };
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