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annotate src/share/vm/interpreter/bytecodeStream.hpp @ 7411:8580f22db905
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author | coleenp |
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date | Fri, 14 Dec 2012 16:43:37 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP |
26 #define SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP | |
27 | |
28 #include "interpreter/bytecode.hpp" | |
29 #include "memory/allocation.hpp" | |
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30 #include "oops/method.hpp" |
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31 #include "runtime/handles.inline.hpp" |
1972 | 32 #ifdef TARGET_ARCH_x86 |
33 # include "bytes_x86.hpp" | |
34 #endif | |
35 #ifdef TARGET_ARCH_sparc | |
36 # include "bytes_sparc.hpp" | |
37 #endif | |
38 #ifdef TARGET_ARCH_zero | |
39 # include "bytes_zero.hpp" | |
40 #endif | |
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41 #ifdef TARGET_ARCH_arm |
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42 # include "bytes_arm.hpp" |
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43 #endif |
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44 #ifdef TARGET_ARCH_ppc |
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45 # include "bytes_ppc.hpp" |
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46 #endif |
1972 | 47 |
0 | 48 // A BytecodeStream is used for fast iteration over the bytecodes |
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49 // of a Method*. |
0 | 50 // |
51 // Usage: | |
52 // | |
53 // BytecodeStream s(method); | |
54 // Bytecodes::Code c; | |
55 // while ((c = s.next()) >= 0) { | |
56 // ... | |
57 // } | |
1565 | 58 |
0 | 59 // A RawBytecodeStream is a simple version of BytecodeStream. |
60 // It is used ONLY when we know the bytecodes haven't been rewritten | |
1565 | 61 // yet, such as in the rewriter or the verifier. |
0 | 62 |
1565 | 63 // Here is the common base class for both RawBytecodeStream and BytecodeStream: |
64 class BaseBytecodeStream: StackObj { | |
0 | 65 protected: |
66 // stream buffer | |
67 methodHandle _method; // read from method directly | |
68 | |
69 // reading position | |
70 int _bci; // bci if current bytecode | |
71 int _next_bci; // bci of next bytecode | |
72 int _end_bci; // bci after the current iteration interval | |
73 | |
74 // last bytecode read | |
1565 | 75 Bytecodes::Code _raw_code; |
0 | 76 bool _is_wide; |
1565 | 77 bool _is_raw; // false in 'cooked' BytecodeStream |
78 | |
79 // Construction | |
80 BaseBytecodeStream(methodHandle method) : _method(method) { | |
81 set_interval(0, _method->code_size()); | |
82 _is_raw = false; | |
83 } | |
0 | 84 |
85 public: | |
86 // Iteration control | |
87 void set_interval(int beg_bci, int end_bci) { | |
88 // iterate over the interval [beg_bci, end_bci) | |
89 assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci"); | |
90 assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci"); | |
91 // setup of iteration pointers | |
92 _bci = beg_bci; | |
93 _next_bci = beg_bci; | |
94 _end_bci = end_bci; | |
95 } | |
96 void set_start (int beg_bci) { | |
97 set_interval(beg_bci, _method->code_size()); | |
98 } | |
99 | |
1565 | 100 bool is_raw() const { return _is_raw; } |
101 | |
102 // Stream attributes | |
103 methodHandle method() const { return _method; } | |
104 | |
105 int bci() const { return _bci; } | |
106 int next_bci() const { return _next_bci; } | |
107 int end_bci() const { return _end_bci; } | |
108 | |
109 Bytecodes::Code raw_code() const { return _raw_code; } | |
110 bool is_wide() const { return _is_wide; } | |
111 int instruction_size() const { return (_next_bci - _bci); } | |
112 bool is_last_bytecode() const { return _next_bci >= _end_bci; } | |
113 | |
114 address bcp() const { return method()->code_base() + _bci; } | |
2142 | 115 Bytecode bytecode() const { return Bytecode(_method(), bcp()); } |
1565 | 116 |
117 // State changes | |
118 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; } | |
119 | |
120 // Bytecode-specific attributes | |
2142 | 121 int dest() const { return bci() + bytecode().get_offset_s2(raw_code()); } |
122 int dest_w() const { return bci() + bytecode().get_offset_s4(raw_code()); } | |
1565 | 123 |
124 // One-byte indices. | |
125 int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); } | |
126 | |
127 protected: | |
128 void assert_raw_index_size(int size) const NOT_DEBUG_RETURN; | |
129 void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN; | |
130 }; | |
131 | |
132 class RawBytecodeStream: public BaseBytecodeStream { | |
133 public: | |
134 // Construction | |
135 RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) { | |
136 _is_raw = true; | |
137 } | |
138 | |
139 public: | |
0 | 140 // Iteration |
141 // Use raw_next() rather than next() for faster method reference | |
142 Bytecodes::Code raw_next() { | |
143 Bytecodes::Code code; | |
144 // set reading position | |
145 _bci = _next_bci; | |
146 assert(!is_last_bytecode(), "caller should check is_last_bytecode()"); | |
147 | |
1565 | 148 address bcp = this->bcp(); |
0 | 149 code = Bytecodes::code_or_bp_at(bcp); |
150 | |
151 // set next bytecode position | |
152 int l = Bytecodes::length_for(code); | |
153 if (l > 0 && (_bci + l) <= _end_bci) { | |
154 assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch | |
155 && code != Bytecodes::_lookupswitch, "can't be special bytecode"); | |
156 _is_wide = false; | |
157 _next_bci += l; | |
1565 | 158 _raw_code = code; |
0 | 159 return code; |
160 } else { | |
161 return raw_next_special(code); | |
162 } | |
163 } | |
164 Bytecodes::Code raw_next_special(Bytecodes::Code code); | |
165 | |
1565 | 166 // Unsigned indices, widening, with no swapping of bytes |
167 int get_index() const { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); } | |
168 // Get an unsigned 2-byte index, with no swapping of bytes. | |
169 int get_index_u2() const { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1); } | |
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170 |
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171 private: |
1565 | 172 int get_index_u2_raw(address p) const { |
173 assert_raw_index_size(2); assert_raw_stream(true); | |
174 return Bytes::get_Java_u2(p); | |
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175 } |
0 | 176 }; |
177 | |
178 // In BytecodeStream, non-java bytecodes will be translated into the | |
179 // corresponding java bytecodes. | |
180 | |
1565 | 181 class BytecodeStream: public BaseBytecodeStream { |
182 Bytecodes::Code _code; | |
183 | |
0 | 184 public: |
185 // Construction | |
1565 | 186 BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { } |
0 | 187 |
188 // Iteration | |
189 Bytecodes::Code next() { | |
1565 | 190 Bytecodes::Code raw_code, code; |
0 | 191 // set reading position |
192 _bci = _next_bci; | |
193 if (is_last_bytecode()) { | |
194 // indicate end of bytecode stream | |
1565 | 195 raw_code = code = Bytecodes::_illegal; |
0 | 196 } else { |
197 // get bytecode | |
1565 | 198 address bcp = this->bcp(); |
2142 | 199 raw_code = Bytecodes::code_at(_method(), bcp); |
1565 | 200 code = Bytecodes::java_code(raw_code); |
0 | 201 // set next bytecode position |
202 // | |
203 // note that we cannot advance before having the | |
204 // tty bytecode otherwise the stepping is wrong! | |
205 // (carefull: length_for(...) must be used first!) | |
206 int l = Bytecodes::length_for(code); | |
2142 | 207 if (l == 0) l = Bytecodes::length_at(_method(), bcp); |
0 | 208 _next_bci += l; |
209 assert(_bci < _next_bci, "length must be > 0"); | |
210 // set attributes | |
211 _is_wide = false; | |
212 // check for special (uncommon) cases | |
213 if (code == Bytecodes::_wide) { | |
1565 | 214 raw_code = (Bytecodes::Code)bcp[1]; |
215 code = raw_code; // wide BCs are always Java-normal | |
0 | 216 _is_wide = true; |
217 } | |
218 assert(Bytecodes::is_java_code(code), "sanity check"); | |
219 } | |
1565 | 220 _raw_code = raw_code; |
0 | 221 _code = code; |
222 return _code; | |
223 } | |
224 | |
225 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } | |
1565 | 226 Bytecodes::Code code() const { return _code; } |
227 | |
228 // Unsigned indices, widening | |
2142 | 229 int get_index() const { return is_wide() ? bytecode().get_index_u2(raw_code(), true) : get_index_u1(); } |
1565 | 230 // Get an unsigned 2-byte index, swapping the bytes if necessary. |
231 int get_index_u2() const { assert_raw_stream(false); | |
2142 | 232 return bytecode().get_index_u2(raw_code(), false); } |
1565 | 233 // Get an unsigned 2-byte index in native order. |
234 int get_index_u2_cpcache() const { assert_raw_stream(false); | |
2142 | 235 return bytecode().get_index_u2_cpcache(raw_code()); } |
1565 | 236 int get_index_u4() const { assert_raw_stream(false); |
2142 | 237 return bytecode().get_index_u4(raw_code()); } |
238 bool has_index_u4() const { return bytecode().has_index_u4(raw_code()); } | |
0 | 239 }; |
1972 | 240 |
241 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP |