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 */
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 class Bytecode: public ThisRelativeObj {
70 protected:
71 u_char byte_at(int offset) const { return *addr_at(offset); }
72 bool check_must_rewrite() const;
73
74 public:
75 // Attributes
76 address bcp() const { return addr_at(0); }
77 address next_bcp() const { return addr_at(0) + Bytecodes::length_at(bcp()); }
78 int instruction_size() const { return Bytecodes::length_at(bcp()); }
79
80 Bytecodes::Code code() const { return Bytecodes::code_at(addr_at(0)); }
81 Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); }
82 bool must_rewrite() const { return Bytecodes::can_rewrite(code()) && check_must_rewrite(); }
83 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
84
85 int one_byte_index() const { assert_index_size(1); return byte_at(1); }
86 int two_byte_index() const { assert_index_size(2); return (byte_at(1) << 8) + byte_at(2); }
87
88 int offset() const { return (two_byte_index() << 16) >> 16; }
89 address destination() const { return bcp() + offset(); }
90
91 // Attribute modification
92 void set_code(Bytecodes::Code code);
93
94 // Creation
95 inline friend Bytecode* Bytecode_at(address bcp);
96
97 private:
98 void assert_index_size(int required_size) const {
99 #ifdef ASSERT
100 int isize = instruction_size() - 1;
101 if (isize == 2 && code() == Bytecodes::_iinc)
102 isize = 1;
103 else if (isize <= 2)
104 ; // no change
105 else if (code() == Bytecodes::_invokedynamic)
106 isize = 4;
107 else
108 isize = 2;
109 assert(isize = required_size, "wrong index size");
110 #endif
111 }
112 };
113
114 inline Bytecode* Bytecode_at(address bcp) {
115 return (Bytecode*)bcp;
116 }
117
118
119 // Abstractions for lookupswitch bytecode
120
121 class LookupswitchPair: ThisRelativeObj {
122 private:
123 int _match;
124 int _offset;
125
126 public:
127 int match() const { return java_signed_word_at(0 * jintSize); }
128 int offset() const { return java_signed_word_at(1 * jintSize); }
129 };
130
131
132 class Bytecode_lookupswitch: public Bytecode {
133 public:
134 void verify() const PRODUCT_RETURN;
135
136 // Attributes
137 int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); }
138 int number_of_pairs() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); }
139 LookupswitchPair* pair_at(int i) const { assert(0 <= i && i < number_of_pairs(), "pair index out of bounds");
140 return (LookupswitchPair*)aligned_addr_at(1 + (1 + i)*2*jintSize); }
141 // Creation
142 inline friend Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp);
143 };
144
145 inline Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp) {
146 Bytecode_lookupswitch* b = (Bytecode_lookupswitch*)bcp;
147 debug_only(b->verify());
148 return b;
149 }
150
151
152 class Bytecode_tableswitch: public Bytecode {
153 public:
154 void verify() const PRODUCT_RETURN;
155
156 // Attributes
157 int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); }
158 int low_key() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); }
159 int high_key() const { return java_signed_word_at(aligned_offset(1 + 2*jintSize)); }
160 int dest_offset_at(int i) const;
161 int length() { return high_key()-low_key()+1; }
162
163 // Creation
164 inline friend Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp);
165 };
166
167 inline Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp) {
168 Bytecode_tableswitch* b = (Bytecode_tableswitch*)bcp;
169 debug_only(b->verify());
170 return b;
171 }
172
173
174 // Abstraction for invoke_{virtual, static, interface, special}
175
176 class Bytecode_invoke: public ResourceObj {
177 protected:
178 methodHandle _method; // method containing the bytecode
179 int _bci; // position of the bytecode
180
181 Bytecode_invoke(methodHandle method, int bci) : _method(method), _bci(bci) {}
182
183 public:
184 void verify() const;
185
186 // Attributes
187 methodHandle method() const { return _method; }
188 int bci() const { return _bci; }
189 address bcp() const { return _method->bcp_from(bci()); }
190
191 int index() const; // the constant pool index for the invoke
192 symbolOop name() const; // returns the name of the invoked method
193 symbolOop signature() const; // returns the signature of the invoked method
194 BasicType result_type(Thread *thread) const; // returns the result type of the invoke
195
196 Bytecodes::Code code() const { return Bytecodes::code_at(bcp(), _method()); }
197 Bytecodes::Code adjusted_invoke_code() const { return Bytecodes::java_code(code()); }
198
199 methodHandle static_target(TRAPS); // "specified" method (from constant pool)
200
201 // Testers
202 bool is_invokeinterface() const { return adjusted_invoke_code() == Bytecodes::_invokeinterface; }
203 bool is_invokevirtual() const { return adjusted_invoke_code() == Bytecodes::_invokevirtual; }
204 bool is_invokestatic() const { return adjusted_invoke_code() == Bytecodes::_invokestatic; }
205 bool is_invokespecial() const { return adjusted_invoke_code() == Bytecodes::_invokespecial; }
206 bool is_invokedynamic() const { return adjusted_invoke_code() == Bytecodes::_invokedynamic; }
207
208 bool has_giant_index() const { return is_invokedynamic(); }
209
210 bool is_valid() const { return is_invokeinterface() ||
211 is_invokevirtual() ||
212 is_invokestatic() ||
213 is_invokespecial() ||
214 is_invokedynamic(); }
215
216 // Creation
217 inline friend Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci);
218
219 // Like Bytecode_invoke_at. Instead it returns NULL if the bci is not at an invoke.
220 inline friend Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci);
221 };
222
223 inline Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci) {
224 Bytecode_invoke* b = new Bytecode_invoke(method, bci);
225 debug_only(b->verify());
226 return b;
227 }
228
229 inline Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci) {
230 Bytecode_invoke* b = new Bytecode_invoke(method, bci);
231 return b->is_valid() ? b : NULL;
232 }
233
234
235 // Abstraction for all field accesses (put/get field/static_
236 class Bytecode_field: public Bytecode {
237 public:
238 void verify() const;
239
240 int index() const;
241 bool is_static() const;
242
243 // Creation
244 inline friend Bytecode_field* Bytecode_field_at(const methodOop method, address bcp);
245 };
246
247 inline Bytecode_field* Bytecode_field_at(const methodOop method, address bcp) {
248 Bytecode_field* b = (Bytecode_field*)bcp;
249 debug_only(b->verify());
250 return b;
251 }
252
253
254 // Abstraction for {get,put}static
255
256 class Bytecode_static: public Bytecode {
257 public:
258 void verify() const;
259
260 // Returns the result type of the send by inspecting the field ref
261 BasicType result_type(methodOop method) const;
262
263 // Creation
264 inline friend Bytecode_static* Bytecode_static_at(const methodOop method, address bcp);
265 };
266
267 inline Bytecode_static* Bytecode_static_at(const methodOop method, address bcp) {
268 Bytecode_static* b = (Bytecode_static*)bcp;
269 debug_only(b->verify());
270 return b;
271 }
272
273
274 // Abstraction for checkcast
275
276 class Bytecode_checkcast: public Bytecode {
277 public:
278 void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }
279
280 // Returns index
281 long index() const { return java_hwrd_at(1); };
282
283 // Creation
284 inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp);
285 };
286
287 inline Bytecode_checkcast* Bytecode_checkcast_at(address bcp) {
288 Bytecode_checkcast* b = (Bytecode_checkcast*)bcp;
289 debug_only(b->verify());
290 return b;
291 }
292
293
294 // Abstraction for instanceof
295
296 class Bytecode_instanceof: public Bytecode {
297 public:
298 void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }
299
300 // Returns index
301 long index() const { return java_hwrd_at(1); };
302
303 // Creation
304 inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp);
305 };
306
307 inline Bytecode_instanceof* Bytecode_instanceof_at(address bcp) {
308 Bytecode_instanceof* b = (Bytecode_instanceof*)bcp;
309 debug_only(b->verify());
310 return b;
311 }
312
313
314 class Bytecode_new: public Bytecode {
315 public:
316 void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }
317
318 // Returns index
319 long index() const { return java_hwrd_at(1); };
320
321 // Creation
322 inline friend Bytecode_new* Bytecode_new_at(address bcp);
323 };
324
325 inline Bytecode_new* Bytecode_new_at(address bcp) {
326 Bytecode_new* b = (Bytecode_new*)bcp;
327 debug_only(b->verify());
328 return b;
329 }
330
331
332 class Bytecode_multianewarray: public Bytecode {
333 public:
334 void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }
335
336 // Returns index
337 long index() const { return java_hwrd_at(1); };
338
339 // Creation
340 inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp);
341 };
342
343 inline Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp) {
344 Bytecode_multianewarray* b = (Bytecode_multianewarray*)bcp;
345 debug_only(b->verify());
346 return b;
347 }
348
349
350 class Bytecode_anewarray: public Bytecode {
351 public:
352 void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); }
353
354 // Returns index
355 long index() const { return java_hwrd_at(1); };
356
357 // Creation
358 inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp);
359 };
360
361 inline Bytecode_anewarray* Bytecode_anewarray_at(address bcp) {
362 Bytecode_anewarray* b = (Bytecode_anewarray*)bcp;
363 debug_only(b->verify());
364 return b;
365 }
366
367
368 // Abstraction for ldc, ldc_w and ldc2_w
369
370 class Bytecode_loadconstant: public Bytecode {
371 public:
372 void verify() const {
373 Bytecodes::Code stdc = Bytecodes::java_code(code());
374 assert(stdc == Bytecodes::_ldc ||
375 stdc == Bytecodes::_ldc_w ||
376 stdc == Bytecodes::_ldc2_w, "load constant");
377 }
378
379 int index() const;
380
381 inline friend Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp);
382 };
383
384 inline Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp) {
385 Bytecode_loadconstant* b = (Bytecode_loadconstant*)bcp;
386 debug_only(b->verify());
387 return b;
388 }