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 };