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 #ifndef SHARE_VM_INTERPRETER_INTERPRETER_HPP
26 #define SHARE_VM_INTERPRETER_INTERPRETER_HPP
27
28 #include "code/stubs.hpp"
29 #include "interpreter/cppInterpreter.hpp"
30 #include "interpreter/templateInterpreter.hpp"
31 #ifdef ZERO
32 #ifdef TARGET_ARCH_zero
33 # include "entry_zero.hpp"
34 #endif
35 #endif
36
37 // This file contains the platform-independent parts
38 // of the interpreter and the interpreter generator.
39
40 //------------------------------------------------------------------------------------------------------------------------
41 // An InterpreterCodelet is a piece of interpreter code. All
42 // interpreter code is generated into little codelets which
43 // contain extra information for debugging and printing purposes.
44
45 class InterpreterCodelet: public Stub {
46 friend class VMStructs;
47 private:
48 int _size; // the size in bytes
49 const char* _description; // a description of the codelet, for debugging & printing
50 Bytecodes::Code _bytecode; // associated bytecode if any
51
52 public:
53 // Initialization/finalization
54 void initialize(int size) { _size = size; }
55 void finalize() { ShouldNotCallThis(); }
56
57 // General info/converters
58 int size() const { return _size; }
59 static int code_size_to_size(int code_size) { return round_to(sizeof(InterpreterCodelet), CodeEntryAlignment) + code_size; }
60
61 // Code info
62 address code_begin() const { return (address)this + round_to(sizeof(InterpreterCodelet), CodeEntryAlignment); }
63 address code_end() const { return (address)this + size(); }
64
65 // Debugging
66 void verify();
67 void print_on(outputStream* st) const;
68 void print() const { print_on(tty); }
69
70 // Interpreter-specific initialization
71 void initialize(const char* description, Bytecodes::Code bytecode);
72
73 // Interpreter-specific attributes
74 int code_size() const { return code_end() - code_begin(); }
75 const char* description() const { return _description; }
76 Bytecodes::Code bytecode() const { return _bytecode; }
77 };
78
79 // Define a prototype interface
80 DEF_STUB_INTERFACE(InterpreterCodelet);
81
82
83 //------------------------------------------------------------------------------------------------------------------------
84 // A CodeletMark serves as an automatic creator/initializer for Codelets
85 // (As a subclass of ResourceMark it automatically GC's the allocated
86 // code buffer and assemblers).
87
88 class CodeletMark: ResourceMark {
89 private:
90 InterpreterCodelet* _clet;
91 InterpreterMacroAssembler** _masm;
92 CodeBuffer _cb;
93
94 int codelet_size() {
95 // Request the whole code buffer (minus a little for alignment).
96 // The commit call below trims it back for each codelet.
97 int codelet_size = AbstractInterpreter::code()->available_space() - 2*K;
98
99 // Guarantee there's a little bit of code space left.
100 guarantee (codelet_size > 0 && (size_t)codelet_size > 2*K,
101 "not enough space for interpreter generation");
102
103 return codelet_size;
104 }
105
106 public:
107 CodeletMark(
108 InterpreterMacroAssembler*& masm,
109 const char* description,
110 Bytecodes::Code bytecode = Bytecodes::_illegal):
111 _clet((InterpreterCodelet*)AbstractInterpreter::code()->request(codelet_size())),
112 _cb(_clet->code_begin(), _clet->code_size())
113
114 { // request all space (add some slack for Codelet data)
115 assert (_clet != NULL, "we checked not enough space already");
116
117 // initialize Codelet attributes
118 _clet->initialize(description, bytecode);
119 // create assembler for code generation
120 masm = new InterpreterMacroAssembler(&_cb);
121 _masm = &masm;
122 }
123
124 ~CodeletMark() {
125 // align so printing shows nop's instead of random code at the end (Codelets are aligned)
126 (*_masm)->align(wordSize);
127 // make sure all code is in code buffer
128 (*_masm)->flush();
129
130
131 // commit Codelet
132 AbstractInterpreter::code()->commit((*_masm)->code()->pure_insts_size());
133 // make sure nobody can use _masm outside a CodeletMark lifespan
134 *_masm = NULL;
135 }
136 };
137
138 // Wrapper classes to produce Interpreter/InterpreterGenerator from either
139 // the c++ interpreter or the template interpreter.
140
141 class Interpreter: public CC_INTERP_ONLY(CppInterpreter) NOT_CC_INTERP(TemplateInterpreter) {
142
143 public:
144 // Debugging/printing
145 static InterpreterCodelet* codelet_containing(address pc) { return (InterpreterCodelet*)_code->stub_containing(pc); }
146 #ifdef TARGET_ARCH_x86
147 # include "interpreter_x86.hpp"
148 #endif
149 #ifdef TARGET_ARCH_sparc
150 # include "interpreter_sparc.hpp"
151 #endif
152 #ifdef TARGET_ARCH_zero
153 # include "interpreter_zero.hpp"
154 #endif
155
156 };
157
158 #endif // SHARE_VM_INTERPRETER_INTERPRETER_HPP