Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/interpreter/bytecodeStream.hpp@fb57d4cf76c2
src/share/vm/interpreter/bytecodeStream.hpp
Tue, 11 May 2010 14:35:43 -0700
- author
- prr
- date
- Tue, 11 May 2010 14:35:43 -0700
- changeset 1840
- fb57d4cf76c2
- parent 1279
- bd02caa94611
- child 1907
- c18cbe5936b8
- child 1920
- ab102d5d923e
- permissions
- -rw-r--r--
6931180: Migration to recent versions of MS Platform SDK
6951582: Build problems on win64
Summary: Changes to enable building JDK7 with Microsoft Visual Studio 2010
Reviewed-by: ohair, art, ccheung, dcubed
1 /*
2 * Copyright 1997-2009 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 */
25 // A BytecodeStream is used for fast iteration over the bytecodes
26 // of a methodOop.
27 //
28 // Usage:
29 //
30 // BytecodeStream s(method);
31 // Bytecodes::Code c;
32 // while ((c = s.next()) >= 0) {
33 // ...
34 // }
35 //
36 // A RawBytecodeStream is a simple version of BytecodeStream.
37 // It is used ONLY when we know the bytecodes haven't been rewritten
38 // yet, such as in the rewriter or the verifier. Currently only the
39 // verifier uses this class.
41 class RawBytecodeStream: StackObj {
42 protected:
43 // stream buffer
44 methodHandle _method; // read from method directly
46 // reading position
47 int _bci; // bci if current bytecode
48 int _next_bci; // bci of next bytecode
49 int _end_bci; // bci after the current iteration interval
51 // last bytecode read
52 Bytecodes::Code _code;
53 bool _is_wide;
55 public:
56 // Construction
57 RawBytecodeStream(methodHandle method) : _method(method) {
58 set_interval(0, _method->code_size());
59 }
61 // Iteration control
62 void set_interval(int beg_bci, int end_bci) {
63 // iterate over the interval [beg_bci, end_bci)
64 assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci");
65 assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci");
66 // setup of iteration pointers
67 _bci = beg_bci;
68 _next_bci = beg_bci;
69 _end_bci = end_bci;
70 }
71 void set_start (int beg_bci) {
72 set_interval(beg_bci, _method->code_size());
73 }
75 // Iteration
76 // Use raw_next() rather than next() for faster method reference
77 Bytecodes::Code raw_next() {
78 Bytecodes::Code code;
79 // set reading position
80 _bci = _next_bci;
81 assert(!is_last_bytecode(), "caller should check is_last_bytecode()");
83 address bcp = RawBytecodeStream::bcp();
84 code = Bytecodes::code_or_bp_at(bcp);
86 // set next bytecode position
87 int l = Bytecodes::length_for(code);
88 if (l > 0 && (_bci + l) <= _end_bci) {
89 assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch
90 && code != Bytecodes::_lookupswitch, "can't be special bytecode");
91 _is_wide = false;
92 _next_bci += l;
93 _code = code;
94 return code;
95 } else if (code == Bytecodes::_wide && _bci + 1 >= _end_bci) {
96 return Bytecodes::_illegal;
97 } else {
98 return raw_next_special(code);
99 }
100 }
101 Bytecodes::Code raw_next_special(Bytecodes::Code code);
103 // Stream attributes
104 methodHandle method() const { return _method; }
106 int bci() const { return _bci; }
107 int next_bci() const { return _next_bci; }
108 int end_bci() const { return _end_bci; }
110 Bytecodes::Code code() const { return _code; }
111 bool is_wide() const { return _is_wide; }
112 int instruction_size() const { return (_next_bci - _bci); }
113 bool is_last_bytecode() const { return _next_bci >= _end_bci; }
115 address bcp() const { return method()->code_base() + _bci; }
116 address next_bcp() { return method()->code_base() + _next_bci; }
118 // State changes
119 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; }
121 // Bytecode-specific attributes
122 int dest() const { return bci() + (short)Bytes::get_Java_u2(bcp() + 1); }
123 int dest_w() const { return bci() + (int )Bytes::get_Java_u4(bcp() + 1); }
125 // Unsigned indices, widening
126 int get_index() const { assert_index_size(is_wide() ? 2 : 1);
127 return (is_wide()) ? Bytes::get_Java_u2(bcp() + 2) : bcp()[1]; }
128 int get_index_big() const { assert_index_size(2);
129 return (int)Bytes::get_Java_u2(bcp() + 1); }
130 int get_index_int() const { return has_giant_index() ? get_index_giant() : get_index_big(); }
131 int get_index_giant() const { assert_index_size(4); return Bytes::get_native_u4(bcp() + 1); }
132 int has_giant_index() const { return (code() == Bytecodes::_invokedynamic); }
134 private:
135 void assert_index_size(int required_size) const {
136 #ifdef ASSERT
137 int isize = instruction_size() - (int)_is_wide - 1;
138 if (isize == 2 && code() == Bytecodes::_iinc)
139 isize = 1;
140 else if (isize <= 2)
141 ; // no change
142 else if (has_giant_index())
143 isize = 4;
144 else
145 isize = 2;
146 assert(isize = required_size, "wrong index size");
147 #endif
148 }
149 };
151 // In BytecodeStream, non-java bytecodes will be translated into the
152 // corresponding java bytecodes.
154 class BytecodeStream: public RawBytecodeStream {
155 public:
156 // Construction
157 BytecodeStream(methodHandle method) : RawBytecodeStream(method) { }
159 // Iteration
160 Bytecodes::Code next() {
161 Bytecodes::Code code;
162 // set reading position
163 _bci = _next_bci;
164 if (is_last_bytecode()) {
165 // indicate end of bytecode stream
166 code = Bytecodes::_illegal;
167 } else {
168 // get bytecode
169 address bcp = BytecodeStream::bcp();
170 code = Bytecodes::java_code_at(bcp);
171 // set next bytecode position
172 //
173 // note that we cannot advance before having the
174 // tty bytecode otherwise the stepping is wrong!
175 // (carefull: length_for(...) must be used first!)
176 int l = Bytecodes::length_for(code);
177 if (l == 0) l = Bytecodes::length_at(bcp);
178 _next_bci += l;
179 assert(_bci < _next_bci, "length must be > 0");
180 // set attributes
181 _is_wide = false;
182 // check for special (uncommon) cases
183 if (code == Bytecodes::_wide) {
184 code = (Bytecodes::Code)bcp[1];
185 _is_wide = true;
186 }
187 assert(Bytecodes::is_java_code(code), "sanity check");
188 }
189 _code = code;
190 return _code;
191 }
193 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
194 };
