Mercurial > hg > truffle
annotate src/share/vm/interpreter/bytecodeStream.hpp @ 952:ace8397c8563
6876276: assert(!is_visited,"visit only once")
Summary: schedule the superword loads based on dependence constraints
Reviewed-by: kvn, never
author | cfang |
---|---|
date | Mon, 31 Aug 2009 08:31:45 -0700 |
parents | bd02caa94611 |
children | c18cbe5936b8 ab102d5d923e |
rev | line source |
---|---|
0 | 1 /* |
844 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 // 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. | |
40 | |
41 class RawBytecodeStream: StackObj { | |
42 protected: | |
43 // stream buffer | |
44 methodHandle _method; // read from method directly | |
45 | |
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 | |
50 | |
51 // last bytecode read | |
52 Bytecodes::Code _code; | |
53 bool _is_wide; | |
54 | |
55 public: | |
56 // Construction | |
57 RawBytecodeStream(methodHandle method) : _method(method) { | |
58 set_interval(0, _method->code_size()); | |
59 } | |
60 | |
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 } | |
74 | |
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()"); | |
82 | |
83 address bcp = RawBytecodeStream::bcp(); | |
84 code = Bytecodes::code_or_bp_at(bcp); | |
85 | |
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); | |
102 | |
103 // Stream attributes | |
104 methodHandle method() const { return _method; } | |
105 | |
106 int bci() const { return _bci; } | |
107 int next_bci() const { return _next_bci; } | |
108 int end_bci() const { return _end_bci; } | |
109 | |
110 Bytecodes::Code code() const { return _code; } | |
111 bool is_wide() const { return _is_wide; } | |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
112 int instruction_size() const { return (_next_bci - _bci); } |
0 | 113 bool is_last_bytecode() const { return _next_bci >= _end_bci; } |
114 | |
115 address bcp() const { return method()->code_base() + _bci; } | |
116 address next_bcp() { return method()->code_base() + _next_bci; } | |
117 | |
118 // State changes | |
119 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; } | |
120 | |
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); } | |
124 | |
125 // Unsigned indices, widening | |
726
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
126 int get_index() const { assert_index_size(is_wide() ? 2 : 1); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
127 return (is_wide()) ? Bytes::get_Java_u2(bcp() + 2) : bcp()[1]; } |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
128 int get_index_big() const { assert_index_size(2); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
129 return (int)Bytes::get_Java_u2(bcp() + 1); } |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
130 int get_index_int() const { return has_giant_index() ? get_index_giant() : get_index_big(); } |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
131 int get_index_giant() const { assert_index_size(4); return Bytes::get_native_u4(bcp() + 1); } |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
132 int has_giant_index() const { return (code() == Bytecodes::_invokedynamic); } |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
133 |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
134 private: |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
135 void assert_index_size(int required_size) const { |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
136 #ifdef ASSERT |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
137 int isize = instruction_size() - (int)_is_wide - 1; |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
138 if (isize == 2 && code() == Bytecodes::_iinc) |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
139 isize = 1; |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
140 else if (isize <= 2) |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
141 ; // no change |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
142 else if (has_giant_index()) |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
143 isize = 4; |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
144 else |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
145 isize = 2; |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
146 assert(isize = required_size, "wrong index size"); |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
147 #endif |
be93aad57795
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
0
diff
changeset
|
148 } |
0 | 149 }; |
150 | |
151 // In BytecodeStream, non-java bytecodes will be translated into the | |
152 // corresponding java bytecodes. | |
153 | |
154 class BytecodeStream: public RawBytecodeStream { | |
155 public: | |
156 // Construction | |
157 BytecodeStream(methodHandle method) : RawBytecodeStream(method) { } | |
158 | |
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 } | |
192 | |
193 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } | |
194 }; |