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comparison src/share/vm/interpreter/interpreter.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // This file contains the platform-independant 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();
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
67 DEF_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
75 class 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
128 class 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 };