1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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 public:
30 // Address computation
31 address addr_at (int offset) const { return (address)this + offset; }
32 int byte_at (int offset) const { return *(addr_at(offset)); }
33 address aligned_addr_at (int offset) const { return (address)round_to((intptr_t)addr_at(offset), jintSize); }
34 int aligned_offset (int offset) const { return aligned_addr_at(offset) - addr_at(0); }
35
36 // Word access:
37 int get_Java_u2_at (int offset) const { return Bytes::get_Java_u2(addr_at(offset)); }
38 int get_Java_u4_at (int offset) const { return Bytes::get_Java_u4(addr_at(offset)); }
39 int get_native_u2_at (int offset) const { return Bytes::get_native_u2(addr_at(offset)); }
40 int get_native_u4_at (int offset) const { return Bytes::get_native_u4(addr_at(offset)); }
41 };
42
43
44 // The base class for different kinds of bytecode abstractions.
45 // Provides the primitive operations to manipulate code relative
46 // to an objects 'this' pointer.
47 // FIXME: Make this a ResourceObj, include the enclosing methodOop, and cache the opcode.
48
49 class Bytecode: public ThisRelativeObj {
50 protected:
51 u_char byte_at(int offset) const { return *addr_at(offset); }
52 bool check_must_rewrite(Bytecodes::Code bc) const;
53
54 public:
55 // Attributes
56 address bcp() const { return addr_at(0); }
57 int instruction_size() const { return Bytecodes::length_at(bcp()); }
58
59 // Warning: Use code() with caution on live bytecode streams. 4926272
60 Bytecodes::Code code() const { return Bytecodes::code_at(addr_at(0)); }
61 Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); }
62 bool must_rewrite(Bytecodes::Code code) const { return Bytecodes::can_rewrite(code) && check_must_rewrite(code); }
63
64 // Creation
65 inline friend Bytecode* Bytecode_at(address bcp);
66
67 // Static functions for parsing bytecodes in place.
68 int get_index_u1(Bytecodes::Code bc) const {
69 assert_same_format_as(bc); assert_index_size(1, bc);
70 return *(jubyte*)addr_at(1);
71 }
72 int get_index_u2(Bytecodes::Code bc, bool is_wide = false) const {
73 assert_same_format_as(bc, is_wide); assert_index_size(2, bc, is_wide);
74 address p = addr_at(is_wide ? 2 : 1);
75 if (can_use_native_byte_order(bc, is_wide))
76 return Bytes::get_native_u2(p);
77 else return Bytes::get_Java_u2(p);
78 }
79 int get_index_u1_cpcache(Bytecodes::Code bc) const {
80 assert_same_format_as(bc); assert_index_size(1, bc);
81 return *(jubyte*)addr_at(1) + constantPoolOopDesc::CPCACHE_INDEX_TAG;
82 }
83 int get_index_u2_cpcache(Bytecodes::Code bc) const {
84 assert_same_format_as(bc); assert_index_size(2, bc); assert_native_index(bc);
85 return Bytes::get_native_u2(addr_at(1)) + constantPoolOopDesc::CPCACHE_INDEX_TAG;
86 }
87 int get_index_u4(Bytecodes::Code bc) const {
88 assert_same_format_as(bc); assert_index_size(4, bc);
89 assert(can_use_native_byte_order(bc), "");
90 return Bytes::get_native_u4(addr_at(1));
91 }
92 bool has_index_u4(Bytecodes::Code bc) const {
93 return bc == Bytecodes::_invokedynamic;
94 }
95
96 int get_offset_s2(Bytecodes::Code bc) const {
97 assert_same_format_as(bc); assert_offset_size(2, bc);
98 return (jshort) Bytes::get_Java_u2(addr_at(1));
99 }
100 int get_offset_s4(Bytecodes::Code bc) const {
101 assert_same_format_as(bc); assert_offset_size(4, bc);
102 return (jint) Bytes::get_Java_u4(addr_at(1));
103 }
104
105 int get_constant_u1(int offset, Bytecodes::Code bc) const {
106 assert_same_format_as(bc); assert_constant_size(1, offset, bc);
107 return *(jbyte*)addr_at(offset);
108 }
109 int get_constant_u2(int offset, Bytecodes::Code bc, bool is_wide = false) const {
110 assert_same_format_as(bc, is_wide); assert_constant_size(2, offset, bc, is_wide);
111 return (jshort) Bytes::get_Java_u2(addr_at(offset));
112 }
113
114 // These are used locally and also from bytecode streams.
115 void assert_same_format_as(Bytecodes::Code testbc, bool is_wide = false) const NOT_DEBUG_RETURN;
116 static void assert_index_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
117 static void assert_offset_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
118 static void assert_constant_size(int required_size, int where, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
119 static void assert_native_index(Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
120 static bool can_use_native_byte_order(Bytecodes::Code bc, bool is_wide = false) {
121 return (!Bytes::is_Java_byte_ordering_different() || Bytecodes::native_byte_order(bc /*, is_wide*/));
122 }
123 };
124
125 inline Bytecode* Bytecode_at(address bcp) {
126 // Warning: Use with caution on live bytecode streams. 4926272
127 return (Bytecode*)bcp;
128 }
129
130
131 // Abstractions for lookupswitch bytecode
132
133 class LookupswitchPair: ThisRelativeObj {
134 private:
135 int _match;
136 int _offset;
137
138 public:
139 int match() const { return get_Java_u4_at(0 * jintSize); }
140 int offset() const { return get_Java_u4_at(1 * jintSize); }
141 };
142
143
144 class Bytecode_lookupswitch: public Bytecode {
145 public:
146 void verify() const PRODUCT_RETURN;
147
148 // Attributes
149 int default_offset() const { return get_Java_u4_at(aligned_offset(1 + 0*jintSize)); }
150 int number_of_pairs() const { return get_Java_u4_at(aligned_offset(1 + 1*jintSize)); }
151 LookupswitchPair* pair_at(int i) const { assert(0 <= i && i < number_of_pairs(), "pair index out of bounds");
152 return (LookupswitchPair*)aligned_addr_at(1 + (1 + i)*2*jintSize); }
153 // Creation
154 inline friend Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp);
155 };
156
157 inline Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp) {
158 Bytecode_lookupswitch* b = (Bytecode_lookupswitch*)bcp;
159 DEBUG_ONLY(b->verify());
160 return b;
161 }
162
163
164 class Bytecode_tableswitch: public Bytecode {
165 public:
166 void verify() const PRODUCT_RETURN;
167
168 // Attributes
169 int default_offset() const { return get_Java_u4_at(aligned_offset(1 + 0*jintSize)); }
170 int low_key() const { return get_Java_u4_at(aligned_offset(1 + 1*jintSize)); }
171 int high_key() const { return get_Java_u4_at(aligned_offset(1 + 2*jintSize)); }
172 int dest_offset_at(int i) const;
173 int length() { return high_key()-low_key()+1; }
174
175 // Creation
176 inline friend Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp);
177 };
178
179 inline Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp) {
180 Bytecode_tableswitch* b = (Bytecode_tableswitch*)bcp;
181 DEBUG_ONLY(b->verify());
182 return b;
183 }
184
185
186 // Common code for decoding invokes and field references.
187
188 class Bytecode_member_ref: public ResourceObj {
189 protected:
190 methodHandle _method; // method containing the bytecode
191 int _bci; // position of the bytecode
192
193 Bytecode_member_ref(methodHandle method, int bci) : _method(method), _bci(bci) {}
194
195 public:
196 // Attributes
197 methodHandle method() const { return _method; }
198 int bci() const { return _bci; }
199 address bcp() const { return _method->bcp_from(bci()); }
200 Bytecode* bytecode() const { return Bytecode_at(bcp()); }
201
202 int index() const; // cache index (loaded from instruction)
203 int pool_index() const; // constant pool index
204 symbolOop name() const; // returns the name of the method or field
205 symbolOop signature() const; // returns the signature of the method or field
206
207 BasicType result_type(Thread* thread) const; // returns the result type of the getfield or invoke
208
209 Bytecodes::Code code() const { return Bytecodes::code_at(bcp(), _method()); }
210 Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); }
211 };
212
213 // Abstraction for invoke_{virtual, static, interface, special}
214
215 class Bytecode_invoke: public Bytecode_member_ref {
216 protected:
217 Bytecode_invoke(methodHandle method, int bci) : Bytecode_member_ref(method, bci) {}
218
219 public:
220 void verify() const;
221
222 // Attributes
223 methodHandle static_target(TRAPS); // "specified" method (from constant pool)
224
225 // Testers
226 bool is_invokeinterface() const { return java_code() == Bytecodes::_invokeinterface; }
227 bool is_invokevirtual() const { return java_code() == Bytecodes::_invokevirtual; }
228 bool is_invokestatic() const { return java_code() == Bytecodes::_invokestatic; }
229 bool is_invokespecial() const { return java_code() == Bytecodes::_invokespecial; }
230 bool is_invokedynamic() const { return java_code() == Bytecodes::_invokedynamic; }
231
232 bool has_receiver() const { return !is_invokestatic() && !is_invokedynamic(); }
233
234 bool is_valid() const { return is_invokeinterface() ||
235 is_invokevirtual() ||
236 is_invokestatic() ||
237 is_invokespecial() ||
238 is_invokedynamic(); }
239
240 // Creation
241 inline friend Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci);
242
243 // Like Bytecode_invoke_at. Instead it returns NULL if the bci is not at an invoke.
244 inline friend Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci);
245 };
246
247 inline Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci) {
248 Bytecode_invoke* b = new Bytecode_invoke(method, bci);
249 DEBUG_ONLY(b->verify());
250 return b;
251 }
252
253 inline Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci) {
254 Bytecode_invoke* b = new Bytecode_invoke(method, bci);
255 return b->is_valid() ? b : NULL;
256 }
257
258
259 // Abstraction for all field accesses (put/get field/static)
260 class Bytecode_field: public Bytecode_member_ref {
261 protected:
262 Bytecode_field(methodHandle method, int bci) : Bytecode_member_ref(method, bci) {}
263
264 public:
265 // Testers
266 bool is_getfield() const { return java_code() == Bytecodes::_getfield; }
267 bool is_putfield() const { return java_code() == Bytecodes::_putfield; }
268 bool is_getstatic() const { return java_code() == Bytecodes::_getstatic; }
269 bool is_putstatic() const { return java_code() == Bytecodes::_putstatic; }
270
271 bool is_getter() const { return is_getfield() || is_getstatic(); }
272 bool is_static() const { return is_getstatic() || is_putstatic(); }
273
274 bool is_valid() const { return is_getfield() ||
275 is_putfield() ||
276 is_getstatic() ||
277 is_putstatic(); }
278 void verify() const;
279
280 // Creation
281 inline friend Bytecode_field* Bytecode_field_at(methodHandle method, int bci);
282 };
283
284 inline Bytecode_field* Bytecode_field_at(methodHandle method, int bci) {
285 Bytecode_field* b = new Bytecode_field(method, bci);
286 DEBUG_ONLY(b->verify());
287 return b;
288 }
289
290
291 // Abstraction for checkcast
292
293 class Bytecode_checkcast: public Bytecode {
294 public:
295 void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }
296
297 // Returns index
298 long index() const { return get_index_u2(Bytecodes::_checkcast); };
299
300 // Creation
301 inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp);
302 };
303
304 inline Bytecode_checkcast* Bytecode_checkcast_at(address bcp) {
305 Bytecode_checkcast* b = (Bytecode_checkcast*)bcp;
306 DEBUG_ONLY(b->verify());
307 return b;
308 }
309
310
311 // Abstraction for instanceof
312
313 class Bytecode_instanceof: public Bytecode {
314 public:
315 void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }
316
317 // Returns index
318 long index() const { return get_index_u2(Bytecodes::_instanceof); };
319
320 // Creation
321 inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp);
322 };
323
324 inline Bytecode_instanceof* Bytecode_instanceof_at(address bcp) {
325 Bytecode_instanceof* b = (Bytecode_instanceof*)bcp;
326 DEBUG_ONLY(b->verify());
327 return b;
328 }
329
330
331 class Bytecode_new: public Bytecode {
332 public:
333 void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }
334
335 // Returns index
336 long index() const { return get_index_u2(Bytecodes::_new); };
337
338 // Creation
339 inline friend Bytecode_new* Bytecode_new_at(address bcp);
340 };
341
342 inline Bytecode_new* Bytecode_new_at(address bcp) {
343 Bytecode_new* b = (Bytecode_new*)bcp;
344 DEBUG_ONLY(b->verify());
345 return b;
346 }
347
348
349 class Bytecode_multianewarray: public Bytecode {
350 public:
351 void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }
352
353 // Returns index
354 long index() const { return get_index_u2(Bytecodes::_multianewarray); };
355
356 // Creation
357 inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp);
358 };
359
360 inline Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp) {
361 Bytecode_multianewarray* b = (Bytecode_multianewarray*)bcp;
362 DEBUG_ONLY(b->verify());
363 return b;
364 }
365
366
367 class Bytecode_anewarray: public Bytecode {
368 public:
369 void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); }
370
371 // Returns index
372 long index() const { return get_index_u2(Bytecodes::_anewarray); };
373
374 // Creation
375 inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp);
376 };
377
378 inline Bytecode_anewarray* Bytecode_anewarray_at(address bcp) {
379 Bytecode_anewarray* b = (Bytecode_anewarray*)bcp;
380 DEBUG_ONLY(b->verify());
381 return b;
382 }
383
384
385 // Abstraction for ldc, ldc_w and ldc2_w
386
387 class Bytecode_loadconstant: public ResourceObj {
388 private:
389 int _bci;
390 methodHandle _method;
391
392 Bytecodes::Code code() const { return bytecode()->code(); }
393
394 int raw_index() const;
395
396 Bytecode_loadconstant(methodHandle method, int bci) : _method(method), _bci(bci) {}
397
398 public:
399 // Attributes
400 methodHandle method() const { return _method; }
401 int bci() const { return _bci; }
402 address bcp() const { return _method->bcp_from(bci()); }
403 Bytecode* bytecode() const { return Bytecode_at(bcp()); }
404
405 void verify() const {
406 assert(_method.not_null(), "must supply method");
407 Bytecodes::Code stdc = Bytecodes::java_code(code());
408 assert(stdc == Bytecodes::_ldc ||
409 stdc == Bytecodes::_ldc_w ||
410 stdc == Bytecodes::_ldc2_w, "load constant");
411 }
412
413 // Only non-standard bytecodes (fast_aldc) have CP cache indexes.
414 bool has_cache_index() const { return code() >= Bytecodes::number_of_java_codes; }
415
416 int pool_index() const; // index into constant pool
417 int cache_index() const { // index into CP cache (or -1 if none)
418 return has_cache_index() ? raw_index() : -1;
419 }
420
421 BasicType result_type() const; // returns the result type of the ldc
422
423 oop resolve_constant(TRAPS) const;
424
425 // Creation
426 inline friend Bytecode_loadconstant* Bytecode_loadconstant_at(methodHandle method, int bci);
427 };
428
429 inline Bytecode_loadconstant* Bytecode_loadconstant_at(methodHandle method, int bci) {
430 Bytecode_loadconstant* b = new Bytecode_loadconstant(method, bci);
431 DEBUG_ONLY(b->verify());
432 return b;
433 }