bytecode.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1997, 2009, 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
28class 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
69class 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
114inline Bytecode* Bytecode_at(address bcp) {
115  return (Bytecode*)bcp;
116}
117
118
119// Abstractions for lookupswitch bytecode
120
121class 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
132class 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
145inline 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
152class 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
167inline 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
176class 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_receiver() const                      { return !is_invokestatic() && !is_invokedynamic(); }
209  bool has_giant_index() const                   { return is_invokedynamic(); }
210
211  bool is_valid() const                          { return is_invokeinterface() ||
212                                                          is_invokevirtual()   ||
213                                                          is_invokestatic()    ||
214                                                          is_invokespecial()   ||
215                                                          is_invokedynamic(); }
216
217  // Creation
218  inline friend Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci);
219
220  // Like Bytecode_invoke_at. Instead it returns NULL if the bci is not at an invoke.
221  inline friend Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci);
222};
223
224inline Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci) {
225  Bytecode_invoke* b = new Bytecode_invoke(method, bci);
226  debug_only(b->verify());
227  return b;
228}
229
230inline Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci) {
231  Bytecode_invoke* b = new Bytecode_invoke(method, bci);
232  return b->is_valid() ? b : NULL;
233}
234
235
236// Abstraction for all field accesses (put/get field/static_
237class Bytecode_field: public Bytecode {
238public:
239  void verify() const;
240
241  int  index() const;
242  bool is_static() const;
243
244  // Creation
245  inline friend Bytecode_field* Bytecode_field_at(const methodOop method, address bcp);
246};
247
248inline Bytecode_field* Bytecode_field_at(const methodOop method, address bcp) {
249  Bytecode_field* b = (Bytecode_field*)bcp;
250  debug_only(b->verify());
251  return b;
252}
253
254
255// Abstraction for {get,put}static
256
257class Bytecode_static: public Bytecode {
258 public:
259  void verify() const;
260
261  // Returns the result type of the send by inspecting the field ref
262  BasicType result_type(methodOop method) const;
263
264  // Creation
265  inline friend Bytecode_static* Bytecode_static_at(const methodOop method, address bcp);
266};
267
268inline Bytecode_static* Bytecode_static_at(const methodOop method, address bcp) {
269  Bytecode_static* b = (Bytecode_static*)bcp;
270  debug_only(b->verify());
271  return b;
272}
273
274
275// Abstraction for checkcast
276
277class Bytecode_checkcast: public Bytecode {
278 public:
279  void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }
280
281  // Returns index
282  long index() const   { return java_hwrd_at(1); };
283
284  // Creation
285  inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp);
286};
287
288inline Bytecode_checkcast* Bytecode_checkcast_at(address bcp) {
289  Bytecode_checkcast* b = (Bytecode_checkcast*)bcp;
290  debug_only(b->verify());
291  return b;
292}
293
294
295// Abstraction for instanceof
296
297class Bytecode_instanceof: public Bytecode {
298 public:
299  void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }
300
301  // Returns index
302  long index() const   { return java_hwrd_at(1); };
303
304  // Creation
305  inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp);
306};
307
308inline Bytecode_instanceof* Bytecode_instanceof_at(address bcp) {
309  Bytecode_instanceof* b = (Bytecode_instanceof*)bcp;
310  debug_only(b->verify());
311  return b;
312}
313
314
315class Bytecode_new: public Bytecode {
316 public:
317  void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }
318
319  // Returns index
320  long index() const   { return java_hwrd_at(1); };
321
322  // Creation
323  inline friend Bytecode_new* Bytecode_new_at(address bcp);
324};
325
326inline Bytecode_new* Bytecode_new_at(address bcp) {
327  Bytecode_new* b = (Bytecode_new*)bcp;
328  debug_only(b->verify());
329  return b;
330}
331
332
333class Bytecode_multianewarray: public Bytecode {
334 public:
335  void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }
336
337  // Returns index
338  long index() const   { return java_hwrd_at(1); };
339
340  // Creation
341  inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp);
342};
343
344inline Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp) {
345  Bytecode_multianewarray* b = (Bytecode_multianewarray*)bcp;
346  debug_only(b->verify());
347  return b;
348}
349
350
351class Bytecode_anewarray: public Bytecode {
352 public:
353  void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); }
354
355  // Returns index
356  long index() const   { return java_hwrd_at(1); };
357
358  // Creation
359  inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp);
360};
361
362inline Bytecode_anewarray* Bytecode_anewarray_at(address bcp) {
363  Bytecode_anewarray* b = (Bytecode_anewarray*)bcp;
364  debug_only(b->verify());
365  return b;
366}
367
368
369// Abstraction for ldc, ldc_w and ldc2_w
370
371class Bytecode_loadconstant: public Bytecode {
372 public:
373  void verify() const {
374    Bytecodes::Code stdc = Bytecodes::java_code(code());
375    assert(stdc == Bytecodes::_ldc ||
376           stdc == Bytecodes::_ldc_w ||
377           stdc == Bytecodes::_ldc2_w, "load constant");
378  }
379
380  int index() const;
381
382  inline friend Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp);
383};
384
385inline Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp) {
386  Bytecode_loadconstant* b = (Bytecode_loadconstant*)bcp;
387  debug_only(b->verify());
388  return b;
389}
390