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comparison src/share/vm/interpreter/bytecode.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2002 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 */
24
25 // Base class for different kinds of abstractions working
26 // relative to an objects 'this' pointer.
27
28 class ThisRelativeObj VALUE_OBJ_CLASS_SPEC {
29 private:
30 int sign_extend (int x, int size) const { const int s = (BytesPerInt - size)*BitsPerByte; return (x << s) >> s; }
31
32 public:
33 // Address computation
34 address addr_at (int offset) const { return (address)this + offset; }
35 address aligned_addr_at (int offset) const { return (address)round_to((intptr_t)addr_at(offset), jintSize); }
36 int aligned_offset (int offset) const { return aligned_addr_at(offset) - addr_at(0); }
37
38 // Java unsigned accessors (using Java spec byte ordering)
39 int java_byte_at (int offset) const { return *(jubyte*)addr_at(offset); }
40 int java_hwrd_at (int offset) const { return java_byte_at(offset) << (1 * BitsPerByte) | java_byte_at(offset + 1); }
41 int java_word_at (int offset) const { return java_hwrd_at(offset) << (2 * BitsPerByte) | java_hwrd_at(offset + 2); }
42
43 // Java signed accessors (using Java spec byte ordering)
44 int java_signed_byte_at(int offset) const { return sign_extend(java_byte_at(offset), 1); }
45 int java_signed_hwrd_at(int offset) const { return sign_extend(java_hwrd_at(offset), 2); }
46 int java_signed_word_at(int offset) const { return java_word_at(offset) ; }
47
48 // Fast accessors (using the machine's natural byte ordering)
49 int fast_byte_at (int offset) const { return *(jubyte *)addr_at(offset); }
50 int fast_hwrd_at (int offset) const { return *(jushort*)addr_at(offset); }
51 int fast_word_at (int offset) const { return *(juint *)addr_at(offset); }
52
53 // Fast signed accessors (using the machine's natural byte ordering)
54 int fast_signed_byte_at(int offset) const { return *(jbyte *)addr_at(offset); }
55 int fast_signed_hwrd_at(int offset) const { return *(jshort*)addr_at(offset); }
56 int fast_signed_word_at(int offset) const { return *(jint *)addr_at(offset); }
57
58 // Fast manipulators (using the machine's natural byte ordering)
59 void set_fast_byte_at (int offset, int x) const { *(jbyte *)addr_at(offset) = (jbyte )x; }
60 void set_fast_hwrd_at (int offset, int x) const { *(jshort*)addr_at(offset) = (jshort)x; }
61 void set_fast_word_at (int offset, int x) const { *(jint *)addr_at(offset) = (jint )x; }
62 };
63
64
65 // The base class for different kinds of bytecode abstractions.
66 // Provides the primitive operations to manipulate code relative
67 // to an objects 'this' pointer.
68 //
69 // Note: Even though it seems that the fast_index & set_fast_index
70 // functions are machine specific, they're not. They only use
71 // the natural way to store a 16bit index on a given machine,
72 // independent of the particular byte ordering. Since all other
73 // places in the system that refer to these indices use the
74 // same method (the natural byte ordering on the platform)
75 // this will always work and be machine-independent).
76
77 class Bytecode: public ThisRelativeObj {
78 protected:
79 u_char byte_at(int offset) const { return *addr_at(offset); }
80 bool check_must_rewrite() const;
81
82 public:
83 // Attributes
84 address bcp() const { return addr_at(0); }
85 address next_bcp() const { return addr_at(0) + Bytecodes::length_at(bcp()); }
86
87 Bytecodes::Code code() const { return Bytecodes::code_at(addr_at(0)); }
88 Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); }
89 bool must_rewrite() const { return Bytecodes::can_rewrite(code()) && check_must_rewrite(); }
90 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
91
92 int one_byte_index() const { return byte_at(1); }
93 int two_byte_index() const { return (byte_at(1) << 8) + byte_at(2); }
94 int offset() const { return (two_byte_index() << 16) >> 16; }
95 address destination() const { return bcp() + offset(); }
96 int fast_index() const { return Bytes::get_native_u2(addr_at(1)); }
97
98 // Attribute modification
99 void set_code(Bytecodes::Code code);
100 void set_fast_index(int i);
101
102 // Creation
103 inline friend Bytecode* Bytecode_at(address bcp);
104 };
105
106 inline Bytecode* Bytecode_at(address bcp) {
107 return (Bytecode*)bcp;
108 }
109
110
111 // Abstractions for lookupswitch bytecode
112
113 class LookupswitchPair: ThisRelativeObj {
114 private:
115 int _match;
116 int _offset;
117
118 public:
119 int match() const { return java_signed_word_at(0 * jintSize); }
120 int offset() const { return java_signed_word_at(1 * jintSize); }
121 };
122
123
124 class Bytecode_lookupswitch: public Bytecode {
125 public:
126 void verify() const PRODUCT_RETURN;
127
128 // Attributes
129 int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); }
130 int number_of_pairs() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); }
131 LookupswitchPair* pair_at(int i) const { assert(0 <= i && i < number_of_pairs(), "pair index out of bounds");
132 return (LookupswitchPair*)aligned_addr_at(1 + (1 + i)*2*jintSize); }
133 // Creation
134 inline friend Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp);
135 };
136
137 inline Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp) {
138 Bytecode_lookupswitch* b = (Bytecode_lookupswitch*)bcp;
139 debug_only(b->verify());
140 return b;
141 }
142
143
144 class Bytecode_tableswitch: public Bytecode {
145 public:
146 void verify() const PRODUCT_RETURN;
147
148 // Attributes
149 int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); }
150 int low_key() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); }
151 int high_key() const { return java_signed_word_at(aligned_offset(1 + 2*jintSize)); }
152 int dest_offset_at(int i) const;
153 int length() { return high_key()-low_key()+1; }
154
155 // Creation
156 inline friend Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp);
157 };
158
159 inline Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp) {
160 Bytecode_tableswitch* b = (Bytecode_tableswitch*)bcp;
161 debug_only(b->verify());
162 return b;
163 }
164
165
166 // Abstraction for invoke_{virtual, static, interface, special}
167
168 class Bytecode_invoke: public ResourceObj {
169 protected:
170 methodHandle _method; // method containing the bytecode
171 int _bci; // position of the bytecode
172
173 Bytecode_invoke(methodHandle method, int bci) : _method(method), _bci(bci) {}
174
175 public:
176 void verify() const;
177
178 // Attributes
179 methodHandle method() const { return _method; }
180 int bci() const { return _bci; }
181 address bcp() const { return _method->bcp_from(bci()); }
182
183 int index() const; // the constant pool index for the invoke
184 symbolOop name() const; // returns the name of the invoked method
185 symbolOop signature() const; // returns the signature of the invoked method
186 BasicType result_type(Thread *thread) const; // returns the result type of the invoke
187
188 Bytecodes::Code code() const { return Bytecodes::code_at(bcp(), _method()); }
189 Bytecodes::Code adjusted_invoke_code() const { return Bytecodes::java_code(code()); }
190
191 methodHandle static_target(TRAPS); // "specified" method (from constant pool)
192
193 // Testers
194 bool is_invokeinterface() const { return adjusted_invoke_code() == Bytecodes::_invokeinterface; }
195 bool is_invokevirtual() const { return adjusted_invoke_code() == Bytecodes::_invokevirtual; }
196 bool is_invokestatic() const { return adjusted_invoke_code() == Bytecodes::_invokestatic; }
197 bool is_invokespecial() const { return adjusted_invoke_code() == Bytecodes::_invokespecial; }
198
199 bool is_valid() const { return is_invokeinterface() ||
200 is_invokevirtual() ||
201 is_invokestatic() ||
202 is_invokespecial(); }
203
204 // Creation
205 inline friend Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci);
206
207 // Like Bytecode_invoke_at. Instead it returns NULL if the bci is not at an invoke.
208 inline friend Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci);
209 };
210
211 inline Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci) {
212 Bytecode_invoke* b = new Bytecode_invoke(method, bci);
213 debug_only(b->verify());
214 return b;
215 }
216
217 inline Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci) {
218 Bytecode_invoke* b = new Bytecode_invoke(method, bci);
219 return b->is_valid() ? b : NULL;
220 }
221
222
223 // Abstraction for all field accesses (put/get field/static_
224 class Bytecode_field: public Bytecode {
225 public:
226 void verify() const;
227
228 int index() const;
229 bool is_static() const;
230
231 // Creation
232 inline friend Bytecode_field* Bytecode_field_at(const methodOop method, address bcp);
233 };
234
235 inline Bytecode_field* Bytecode_field_at(const methodOop method, address bcp) {
236 Bytecode_field* b = (Bytecode_field*)bcp;
237 debug_only(b->verify());
238 return b;
239 }
240
241
242 // Abstraction for {get,put}static
243
244 class Bytecode_static: public Bytecode {
245 public:
246 void verify() const;
247
248 // Returns the result type of the send by inspecting the field ref
249 BasicType result_type(methodOop method) const;
250
251 // Creation
252 inline friend Bytecode_static* Bytecode_static_at(const methodOop method, address bcp);
253 };
254
255 inline Bytecode_static* Bytecode_static_at(const methodOop method, address bcp) {
256 Bytecode_static* b = (Bytecode_static*)bcp;
257 debug_only(b->verify());
258 return b;
259 }
260
261
262 // Abstraction for checkcast
263
264 class Bytecode_checkcast: public Bytecode {
265 public:
266 void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }
267
268 // Returns index
269 long index() const { return java_hwrd_at(1); };
270
271 // Creation
272 inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp);
273 };
274
275 inline Bytecode_checkcast* Bytecode_checkcast_at(address bcp) {
276 Bytecode_checkcast* b = (Bytecode_checkcast*)bcp;
277 debug_only(b->verify());
278 return b;
279 }
280
281
282 // Abstraction for instanceof
283
284 class Bytecode_instanceof: public Bytecode {
285 public:
286 void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }
287
288 // Returns index
289 long index() const { return java_hwrd_at(1); };
290
291 // Creation
292 inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp);
293 };
294
295 inline Bytecode_instanceof* Bytecode_instanceof_at(address bcp) {
296 Bytecode_instanceof* b = (Bytecode_instanceof*)bcp;
297 debug_only(b->verify());
298 return b;
299 }
300
301
302 class Bytecode_new: public Bytecode {
303 public:
304 void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }
305
306 // Returns index
307 long index() const { return java_hwrd_at(1); };
308
309 // Creation
310 inline friend Bytecode_new* Bytecode_new_at(address bcp);
311 };
312
313 inline Bytecode_new* Bytecode_new_at(address bcp) {
314 Bytecode_new* b = (Bytecode_new*)bcp;
315 debug_only(b->verify());
316 return b;
317 }
318
319
320 class Bytecode_multianewarray: public Bytecode {
321 public:
322 void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }
323
324 // Returns index
325 long index() const { return java_hwrd_at(1); };
326
327 // Creation
328 inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp);
329 };
330
331 inline Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp) {
332 Bytecode_multianewarray* b = (Bytecode_multianewarray*)bcp;
333 debug_only(b->verify());
334 return b;
335 }
336
337
338 class Bytecode_anewarray: public Bytecode {
339 public:
340 void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); }
341
342 // Returns index
343 long index() const { return java_hwrd_at(1); };
344
345 // Creation
346 inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp);
347 };
348
349 inline Bytecode_anewarray* Bytecode_anewarray_at(address bcp) {
350 Bytecode_anewarray* b = (Bytecode_anewarray*)bcp;
351 debug_only(b->verify());
352 return b;
353 }
354
355
356 // Abstraction for ldc, ldc_w and ldc2_w
357
358 class Bytecode_loadconstant: public Bytecode {
359 public:
360 void verify() const {
361 Bytecodes::Code stdc = Bytecodes::java_code(code());
362 assert(stdc == Bytecodes::_ldc ||
363 stdc == Bytecodes::_ldc_w ||
364 stdc == Bytecodes::_ldc2_w, "load constant");
365 }
366
367 int index() const;
368
369 inline friend Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp);
370 };
371
372 inline Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp) {
373 Bytecode_loadconstant* b = (Bytecode_loadconstant*)bcp;
374 debug_only(b->verify());
375 return b;
376 }