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comparison src/share/vm/c1/c1_CodeStubs.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 /*
2 * Copyright 1999-2006 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 class CodeEmitInfo;
26 class LIR_Assembler;
27 class LIR_OpVisitState;
28
29 // CodeStubs are little 'out-of-line' pieces of code that
30 // usually handle slow cases of operations. All code stubs
31 // are collected and code is emitted at the end of the
32 // nmethod.
33
34 class CodeStub: public CompilationResourceObj {
35 protected:
36 Label _entry; // label at the stub entry point
37 Label _continuation; // label where stub continues, if any
38
39 public:
40 CodeStub() {}
41
42 // code generation
43 void assert_no_unbound_labels() { assert(!_entry.is_unbound() && !_continuation.is_unbound(), "unbound label"); }
44 virtual void emit_code(LIR_Assembler* e) = 0;
45 virtual CodeEmitInfo* info() const { return NULL; }
46 virtual bool is_exception_throw_stub() const { return false; }
47 virtual bool is_range_check_stub() const { return false; }
48 virtual bool is_divbyzero_stub() const { return false; }
49 #ifndef PRODUCT
50 virtual void print_name(outputStream* out) const = 0;
51 #endif
52
53 // label access
54 Label* entry() { return &_entry; }
55 Label* continuation() { return &_continuation; }
56 // for LIR
57 virtual void visit(LIR_OpVisitState* visit) {
58 #ifndef PRODUCT
59 if (LIRTracePeephole && Verbose) {
60 tty->print("no visitor for ");
61 print_name(tty);
62 tty->cr();
63 }
64 #endif
65 }
66 };
67
68
69 define_array(CodeStubArray, CodeStub*)
70 define_stack(_CodeStubList, CodeStubArray)
71
72 class CodeStubList: public _CodeStubList {
73 public:
74 CodeStubList(): _CodeStubList() {}
75
76 void append(CodeStub* stub) {
77 if (!contains(stub)) {
78 _CodeStubList::append(stub);
79 }
80 }
81 };
82
83 #ifdef TIERED
84 class CounterOverflowStub: public CodeStub {
85 private:
86 CodeEmitInfo* _info;
87 int _bci;
88
89 public:
90 CounterOverflowStub(CodeEmitInfo* info, int bci) : _info(info), _bci(bci) {
91 }
92
93 virtual void emit_code(LIR_Assembler* e);
94
95 virtual void visit(LIR_OpVisitState* visitor) {
96 visitor->do_slow_case(_info);
97 }
98
99 #ifndef PRODUCT
100 virtual void print_name(outputStream* out) const { out->print("CounterOverflowStub"); }
101 #endif // PRODUCT
102
103 };
104 #endif // TIERED
105
106 class ConversionStub: public CodeStub {
107 private:
108 Bytecodes::Code _bytecode;
109 LIR_Opr _input;
110 LIR_Opr _result;
111
112 static float float_zero;
113 static double double_zero;
114 public:
115 ConversionStub(Bytecodes::Code bytecode, LIR_Opr input, LIR_Opr result)
116 : _bytecode(bytecode), _input(input), _result(result) {
117 }
118
119 Bytecodes::Code bytecode() { return _bytecode; }
120 LIR_Opr input() { return _input; }
121 LIR_Opr result() { return _result; }
122
123 virtual void emit_code(LIR_Assembler* e);
124 virtual void visit(LIR_OpVisitState* visitor) {
125 visitor->do_slow_case();
126 visitor->do_input(_input);
127 visitor->do_output(_result);
128 }
129 #ifndef PRODUCT
130 virtual void print_name(outputStream* out) const { out->print("ConversionStub"); }
131 #endif // PRODUCT
132 };
133
134
135 // Throws ArrayIndexOutOfBoundsException by default but can be
136 // configured to throw IndexOutOfBoundsException in constructor
137 class RangeCheckStub: public CodeStub {
138 private:
139 CodeEmitInfo* _info;
140 LIR_Opr _index;
141 bool _throw_index_out_of_bounds_exception;
142
143 public:
144 RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, bool throw_index_out_of_bounds_exception = false);
145 virtual void emit_code(LIR_Assembler* e);
146 virtual CodeEmitInfo* info() const { return _info; }
147 virtual bool is_exception_throw_stub() const { return true; }
148 virtual bool is_range_check_stub() const { return true; }
149 virtual void visit(LIR_OpVisitState* visitor) {
150 visitor->do_slow_case(_info);
151 visitor->do_input(_index);
152 }
153 #ifndef PRODUCT
154 virtual void print_name(outputStream* out) const { out->print("RangeCheckStub"); }
155 #endif // PRODUCT
156 };
157
158
159 class DivByZeroStub: public CodeStub {
160 private:
161 CodeEmitInfo* _info;
162 int _offset;
163
164 public:
165 DivByZeroStub(CodeEmitInfo* info)
166 : _info(info), _offset(-1) {
167 }
168 DivByZeroStub(int offset, CodeEmitInfo* info)
169 : _info(info), _offset(offset) {
170 }
171 virtual void emit_code(LIR_Assembler* e);
172 virtual CodeEmitInfo* info() const { return _info; }
173 virtual bool is_exception_throw_stub() const { return true; }
174 virtual bool is_divbyzero_stub() const { return true; }
175 virtual void visit(LIR_OpVisitState* visitor) {
176 visitor->do_slow_case(_info);
177 }
178 #ifndef PRODUCT
179 virtual void print_name(outputStream* out) const { out->print("DivByZeroStub"); }
180 #endif // PRODUCT
181 };
182
183
184 class ImplicitNullCheckStub: public CodeStub {
185 private:
186 CodeEmitInfo* _info;
187 int _offset;
188
189 public:
190 ImplicitNullCheckStub(int offset, CodeEmitInfo* info)
191 : _offset(offset), _info(info) {
192 }
193 virtual void emit_code(LIR_Assembler* e);
194 virtual CodeEmitInfo* info() const { return _info; }
195 virtual bool is_exception_throw_stub() const { return true; }
196 virtual void visit(LIR_OpVisitState* visitor) {
197 visitor->do_slow_case(_info);
198 }
199 #ifndef PRODUCT
200 virtual void print_name(outputStream* out) const { out->print("ImplicitNullCheckStub"); }
201 #endif // PRODUCT
202 };
203
204
205 class NewInstanceStub: public CodeStub {
206 private:
207 ciInstanceKlass* _klass;
208 LIR_Opr _klass_reg;
209 LIR_Opr _result;
210 CodeEmitInfo* _info;
211 Runtime1::StubID _stub_id;
212
213 public:
214 NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id);
215 virtual void emit_code(LIR_Assembler* e);
216 virtual CodeEmitInfo* info() const { return _info; }
217 virtual void visit(LIR_OpVisitState* visitor) {
218 visitor->do_slow_case(_info);
219 visitor->do_input(_klass_reg);
220 visitor->do_output(_result);
221 }
222 #ifndef PRODUCT
223 virtual void print_name(outputStream* out) const { out->print("NewInstanceStub"); }
224 #endif // PRODUCT
225 };
226
227
228 class NewTypeArrayStub: public CodeStub {
229 private:
230 LIR_Opr _klass_reg;
231 LIR_Opr _length;
232 LIR_Opr _result;
233 CodeEmitInfo* _info;
234
235 public:
236 NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info);
237 virtual void emit_code(LIR_Assembler* e);
238 virtual CodeEmitInfo* info() const { return _info; }
239 virtual void visit(LIR_OpVisitState* visitor) {
240 visitor->do_slow_case(_info);
241 visitor->do_input(_klass_reg);
242 visitor->do_input(_length);
243 assert(_result->is_valid(), "must be valid"); visitor->do_output(_result);
244 }
245 #ifndef PRODUCT
246 virtual void print_name(outputStream* out) const { out->print("NewTypeArrayStub"); }
247 #endif // PRODUCT
248 };
249
250
251 class NewObjectArrayStub: public CodeStub {
252 private:
253 LIR_Opr _klass_reg;
254 LIR_Opr _length;
255 LIR_Opr _result;
256 CodeEmitInfo* _info;
257
258 public:
259 NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info);
260 virtual void emit_code(LIR_Assembler* e);
261 virtual CodeEmitInfo* info() const { return _info; }
262 virtual void visit(LIR_OpVisitState* visitor) {
263 visitor->do_slow_case(_info);
264 visitor->do_input(_klass_reg);
265 visitor->do_input(_length);
266 assert(_result->is_valid(), "must be valid"); visitor->do_output(_result);
267 }
268 #ifndef PRODUCT
269 virtual void print_name(outputStream* out) const { out->print("NewObjectArrayStub"); }
270 #endif // PRODUCT
271 };
272
273
274 class MonitorAccessStub: public CodeStub {
275 protected:
276 LIR_Opr _obj_reg;
277 LIR_Opr _lock_reg;
278
279 public:
280 MonitorAccessStub(LIR_Opr obj_reg, LIR_Opr lock_reg) {
281 _obj_reg = obj_reg;
282 _lock_reg = lock_reg;
283 }
284
285 #ifndef PRODUCT
286 virtual void print_name(outputStream* out) const { out->print("MonitorAccessStub"); }
287 #endif // PRODUCT
288 };
289
290
291 class MonitorEnterStub: public MonitorAccessStub {
292 private:
293 CodeEmitInfo* _info;
294
295 public:
296 MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info);
297
298 virtual void emit_code(LIR_Assembler* e);
299 virtual CodeEmitInfo* info() const { return _info; }
300 virtual void visit(LIR_OpVisitState* visitor) {
301 visitor->do_input(_obj_reg);
302 visitor->do_input(_lock_reg);
303 visitor->do_slow_case(_info);
304 }
305 #ifndef PRODUCT
306 virtual void print_name(outputStream* out) const { out->print("MonitorEnterStub"); }
307 #endif // PRODUCT
308 };
309
310
311 class MonitorExitStub: public MonitorAccessStub {
312 private:
313 bool _compute_lock;
314 int _monitor_ix;
315
316 public:
317 MonitorExitStub(LIR_Opr lock_reg, bool compute_lock, int monitor_ix)
318 : MonitorAccessStub(LIR_OprFact::illegalOpr, lock_reg),
319 _compute_lock(compute_lock), _monitor_ix(monitor_ix) { }
320 virtual void emit_code(LIR_Assembler* e);
321 virtual void visit(LIR_OpVisitState* visitor) {
322 assert(_obj_reg->is_illegal(), "unused");
323 if (_compute_lock) {
324 visitor->do_temp(_lock_reg);
325 } else {
326 visitor->do_input(_lock_reg);
327 }
328 }
329 #ifndef PRODUCT
330 virtual void print_name(outputStream* out) const { out->print("MonitorExitStub"); }
331 #endif // PRODUCT
332 };
333
334
335 class PatchingStub: public CodeStub {
336 public:
337 enum PatchID {
338 access_field_id,
339 load_klass_id
340 };
341 enum constants {
342 patch_info_size = 3
343 };
344 private:
345 PatchID _id;
346 address _pc_start;
347 int _bytes_to_copy;
348 Label _patched_code_entry;
349 Label _patch_site_entry;
350 Label _patch_site_continuation;
351 Register _obj;
352 CodeEmitInfo* _info;
353 int _oop_index; // index of the patchable oop in nmethod oop table if needed
354 static int _patch_info_offset;
355
356 void align_patch_site(MacroAssembler* masm);
357
358 public:
359 static int patch_info_offset() { return _patch_info_offset; }
360
361 PatchingStub(MacroAssembler* masm, PatchID id, int oop_index = -1):
362 _id(id)
363 , _info(NULL)
364 , _oop_index(oop_index) {
365 if (os::is_MP()) {
366 // force alignment of patch sites on MP hardware so we
367 // can guarantee atomic writes to the patch site.
368 align_patch_site(masm);
369 }
370 _pc_start = masm->pc();
371 masm->bind(_patch_site_entry);
372 }
373
374 void install(MacroAssembler* masm, LIR_PatchCode patch_code, Register obj, CodeEmitInfo* info) {
375 _info = info;
376 _obj = obj;
377 masm->bind(_patch_site_continuation);
378 _bytes_to_copy = masm->pc() - pc_start();
379 if (_id == PatchingStub::access_field_id) {
380 // embed a fixed offset to handle long patches which need to be offset by a word.
381 // the patching code will just add the field offset field to this offset so
382 // that we can refernce either the high or low word of a double word field.
383 int field_offset = 0;
384 switch (patch_code) {
385 case lir_patch_low: field_offset = lo_word_offset_in_bytes; break;
386 case lir_patch_high: field_offset = hi_word_offset_in_bytes; break;
387 case lir_patch_normal: field_offset = 0; break;
388 default: ShouldNotReachHere();
389 }
390 NativeMovRegMem* n_move = nativeMovRegMem_at(pc_start());
391 n_move->set_offset(field_offset);
392 } else if (_id == load_klass_id) {
393 assert(_obj != noreg, "must have register object for load_klass");
394 #ifdef ASSERT
395 // verify that we're pointing at a NativeMovConstReg
396 nativeMovConstReg_at(pc_start());
397 #endif
398 } else {
399 ShouldNotReachHere();
400 }
401 assert(_bytes_to_copy <= (masm->pc() - pc_start()), "not enough bytes");
402 }
403
404 address pc_start() const { return _pc_start; }
405 PatchID id() const { return _id; }
406
407 virtual void emit_code(LIR_Assembler* e);
408 virtual CodeEmitInfo* info() const { return _info; }
409 virtual void visit(LIR_OpVisitState* visitor) {
410 visitor->do_slow_case(_info);
411 }
412 #ifndef PRODUCT
413 virtual void print_name(outputStream* out) const { out->print("PatchingStub"); }
414 #endif // PRODUCT
415 };
416
417
418 class SimpleExceptionStub: public CodeStub {
419 private:
420 LIR_Opr _obj;
421 Runtime1::StubID _stub;
422 CodeEmitInfo* _info;
423
424 public:
425 SimpleExceptionStub(Runtime1::StubID stub, LIR_Opr obj, CodeEmitInfo* info):
426 _obj(obj), _info(info), _stub(stub) {
427 }
428
429 virtual void emit_code(LIR_Assembler* e);
430 virtual CodeEmitInfo* info() const { return _info; }
431 virtual bool is_exception_throw_stub() const { return true; }
432 virtual void visit(LIR_OpVisitState* visitor) {
433 if (_obj->is_valid()) visitor->do_input(_obj);
434 visitor->do_slow_case(_info);
435 }
436 #ifndef PRODUCT
437 virtual void print_name(outputStream* out) const { out->print("SimpleExceptionStub"); }
438 #endif // PRODUCT
439 };
440
441
442
443 class ArrayStoreExceptionStub: public CodeStub {
444 private:
445 CodeEmitInfo* _info;
446
447 public:
448 ArrayStoreExceptionStub(CodeEmitInfo* info);
449 virtual void emit_code(LIR_Assembler* emit);
450 virtual CodeEmitInfo* info() const { return _info; }
451 virtual bool is_exception_throw_stub() const { return true; }
452 virtual void visit(LIR_OpVisitState* visitor) {
453 visitor->do_slow_case(_info);
454 }
455 #ifndef PRODUCT
456 virtual void print_name(outputStream* out) const { out->print("ArrayStoreExceptionStub"); }
457 #endif // PRODUCT
458 };
459
460
461 class ArrayCopyStub: public CodeStub {
462 private:
463 LIR_OpArrayCopy* _op;
464
465 public:
466 ArrayCopyStub(LIR_OpArrayCopy* op): _op(op) { }
467
468 LIR_Opr src() const { return _op->src(); }
469 LIR_Opr src_pos() const { return _op->src_pos(); }
470 LIR_Opr dst() const { return _op->dst(); }
471 LIR_Opr dst_pos() const { return _op->dst_pos(); }
472 LIR_Opr length() const { return _op->length(); }
473 LIR_Opr tmp() const { return _op->tmp(); }
474
475 virtual void emit_code(LIR_Assembler* e);
476 virtual CodeEmitInfo* info() const { return _op->info(); }
477 virtual void visit(LIR_OpVisitState* visitor) {
478 // don't pass in the code emit info since it's processed in the fast path
479 visitor->do_slow_case();
480 }
481 #ifndef PRODUCT
482 virtual void print_name(outputStream* out) const { out->print("ArrayCopyStub"); }
483 #endif // PRODUCT
484 };