Mercurial > hg > graal-jvmci-8
annotate src/share/vm/c1/c1_Canonicalizer.cpp @ 24164:f98ea2d742a2
fixed missing exception propagation (JDK-8185790)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 08 Aug 2017 10:06:50 +0200 |
parents | f13e777eb255 |
children |
rev | line source |
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0 | 1 /* |
23614 | 2 * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "c1/c1_Canonicalizer.hpp" | |
27 #include "c1/c1_InstructionPrinter.hpp" | |
28 #include "c1/c1_ValueStack.hpp" | |
29 #include "ci/ciArray.hpp" | |
30 #include "runtime/sharedRuntime.hpp" | |
0 | 31 |
32 | |
1584 | 33 class PrintValueVisitor: public ValueVisitor { |
34 void visit(Value* vp) { | |
35 (*vp)->print_line(); | |
36 } | |
37 }; | |
0 | 38 |
39 void Canonicalizer::set_canonical(Value x) { | |
40 assert(x != NULL, "value must exist"); | |
41 // Note: we can not currently substitute root nodes which show up in | |
42 // the instruction stream (because the instruction list is embedded | |
43 // in the instructions). | |
44 if (canonical() != x) { | |
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45 #ifndef PRODUCT |
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46 if (!x->has_printable_bci()) { |
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47 x->set_printable_bci(bci()); |
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48 } |
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49 #endif |
0 | 50 if (PrintCanonicalization) { |
1584 | 51 PrintValueVisitor do_print_value; |
52 canonical()->input_values_do(&do_print_value); | |
0 | 53 canonical()->print_line(); |
54 tty->print_cr("canonicalized to:"); | |
1584 | 55 x->input_values_do(&do_print_value); |
0 | 56 x->print_line(); |
57 tty->cr(); | |
58 } | |
59 assert(_canonical->type()->tag() == x->type()->tag(), "types must match"); | |
60 _canonical = x; | |
61 } | |
62 } | |
63 | |
64 | |
65 void Canonicalizer::move_const_to_right(Op2* x) { | |
66 if (x->x()->type()->is_constant() && x->is_commutative()) x->swap_operands(); | |
67 } | |
68 | |
69 | |
70 void Canonicalizer::do_Op2(Op2* x) { | |
71 if (x->x() == x->y()) { | |
72 switch (x->op()) { | |
73 case Bytecodes::_isub: set_constant(0); return; | |
74 case Bytecodes::_lsub: set_constant(jlong_cast(0)); return; | |
75 case Bytecodes::_iand: // fall through | |
76 case Bytecodes::_land: // fall through | |
77 case Bytecodes::_ior: // fall through | |
78 case Bytecodes::_lor : set_canonical(x->x()); return; | |
79 case Bytecodes::_ixor: set_constant(0); return; | |
80 case Bytecodes::_lxor: set_constant(jlong_cast(0)); return; | |
81 } | |
82 } | |
83 | |
84 if (x->x()->type()->is_constant() && x->y()->type()->is_constant()) { | |
85 // do constant folding for selected operations | |
86 switch (x->type()->tag()) { | |
87 case intTag: | |
88 { jint a = x->x()->type()->as_IntConstant()->value(); | |
89 jint b = x->y()->type()->as_IntConstant()->value(); | |
90 switch (x->op()) { | |
91 case Bytecodes::_iadd: set_constant(a + b); return; | |
92 case Bytecodes::_isub: set_constant(a - b); return; | |
93 case Bytecodes::_imul: set_constant(a * b); return; | |
94 case Bytecodes::_idiv: | |
95 if (b != 0) { | |
96 if (a == min_jint && b == -1) { | |
97 set_constant(min_jint); | |
98 } else { | |
99 set_constant(a / b); | |
100 } | |
101 return; | |
102 } | |
103 break; | |
104 case Bytecodes::_irem: | |
105 if (b != 0) { | |
106 if (a == min_jint && b == -1) { | |
107 set_constant(0); | |
108 } else { | |
109 set_constant(a % b); | |
110 } | |
111 return; | |
112 } | |
113 break; | |
114 case Bytecodes::_iand: set_constant(a & b); return; | |
115 case Bytecodes::_ior : set_constant(a | b); return; | |
116 case Bytecodes::_ixor: set_constant(a ^ b); return; | |
117 } | |
118 } | |
119 break; | |
120 case longTag: | |
121 { jlong a = x->x()->type()->as_LongConstant()->value(); | |
122 jlong b = x->y()->type()->as_LongConstant()->value(); | |
123 switch (x->op()) { | |
124 case Bytecodes::_ladd: set_constant(a + b); return; | |
125 case Bytecodes::_lsub: set_constant(a - b); return; | |
126 case Bytecodes::_lmul: set_constant(a * b); return; | |
127 case Bytecodes::_ldiv: | |
128 if (b != 0) { | |
129 set_constant(SharedRuntime::ldiv(b, a)); | |
130 return; | |
131 } | |
132 break; | |
133 case Bytecodes::_lrem: | |
134 if (b != 0) { | |
135 set_constant(SharedRuntime::lrem(b, a)); | |
136 return; | |
137 } | |
138 break; | |
139 case Bytecodes::_land: set_constant(a & b); return; | |
140 case Bytecodes::_lor : set_constant(a | b); return; | |
141 case Bytecodes::_lxor: set_constant(a ^ b); return; | |
142 } | |
143 } | |
144 break; | |
145 // other cases not implemented (must be extremely careful with floats & doubles!) | |
146 } | |
147 } | |
148 // make sure constant is on the right side, if any | |
149 move_const_to_right(x); | |
150 | |
151 if (x->y()->type()->is_constant()) { | |
152 // do constant folding for selected operations | |
153 switch (x->type()->tag()) { | |
154 case intTag: | |
155 if (x->y()->type()->as_IntConstant()->value() == 0) { | |
156 switch (x->op()) { | |
157 case Bytecodes::_iadd: set_canonical(x->x()); return; | |
158 case Bytecodes::_isub: set_canonical(x->x()); return; | |
159 case Bytecodes::_imul: set_constant(0); return; | |
160 // Note: for div and rem, make sure that C semantics | |
161 // corresponds to Java semantics! | |
162 case Bytecodes::_iand: set_constant(0); return; | |
163 case Bytecodes::_ior : set_canonical(x->x()); return; | |
164 } | |
165 } | |
166 break; | |
167 case longTag: | |
168 if (x->y()->type()->as_LongConstant()->value() == (jlong)0) { | |
169 switch (x->op()) { | |
170 case Bytecodes::_ladd: set_canonical(x->x()); return; | |
171 case Bytecodes::_lsub: set_canonical(x->x()); return; | |
172 case Bytecodes::_lmul: set_constant((jlong)0); return; | |
173 // Note: for div and rem, make sure that C semantics | |
174 // corresponds to Java semantics! | |
175 case Bytecodes::_land: set_constant((jlong)0); return; | |
176 case Bytecodes::_lor : set_canonical(x->x()); return; | |
177 } | |
178 } | |
179 break; | |
180 } | |
181 } | |
182 } | |
183 | |
184 | |
185 void Canonicalizer::do_Phi (Phi* x) {} | |
186 void Canonicalizer::do_Constant (Constant* x) {} | |
187 void Canonicalizer::do_Local (Local* x) {} | |
188 void Canonicalizer::do_LoadField (LoadField* x) {} | |
189 | |
190 // checks if v is in the block that is currently processed by | |
191 // GraphBuilder. This is the only block that has not BlockEnd yet. | |
192 static bool in_current_block(Value v) { | |
193 int max_distance = 4; | |
194 while (max_distance > 0 && v != NULL && v->as_BlockEnd() == NULL) { | |
195 v = v->next(); | |
196 max_distance--; | |
197 } | |
198 return v == NULL; | |
199 } | |
200 | |
201 void Canonicalizer::do_StoreField (StoreField* x) { | |
202 // If a value is going to be stored into a field or array some of | |
203 // the conversions emitted by javac are unneeded because the fields | |
204 // are packed to their natural size. | |
205 Convert* conv = x->value()->as_Convert(); | |
206 if (conv) { | |
207 Value value = NULL; | |
208 BasicType type = x->field()->type()->basic_type(); | |
209 switch (conv->op()) { | |
210 case Bytecodes::_i2b: if (type == T_BYTE) value = conv->value(); break; | |
211 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) value = conv->value(); break; | |
212 case Bytecodes::_i2c: if (type == T_CHAR || type == T_BYTE) value = conv->value(); break; | |
213 } | |
214 // limit this optimization to current block | |
215 if (value != NULL && in_current_block(conv)) { | |
216 set_canonical(new StoreField(x->obj(), x->offset(), x->field(), value, x->is_static(), | |
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217 x->state_before(), x->needs_patching())); |
0 | 218 return; |
219 } | |
220 } | |
221 | |
222 } | |
223 | |
224 void Canonicalizer::do_ArrayLength (ArrayLength* x) { | |
225 NewArray* array = x->array()->as_NewArray(); | |
226 if (array != NULL && array->length() != NULL) { | |
227 Constant* length = array->length()->as_Constant(); | |
228 if (length != NULL) { | |
229 // do not use the Constant itself, but create a new Constant | |
230 // with same value Otherwise a Constant is live over multiple | |
231 // blocks without being registered in a state array. | |
232 assert(length->type()->as_IntConstant() != NULL, "array length must be integer"); | |
233 set_constant(length->type()->as_IntConstant()->value()); | |
234 } | |
235 } else { | |
236 LoadField* lf = x->array()->as_LoadField(); | |
1295 | 237 if (lf != NULL) { |
238 ciField* field = lf->field(); | |
239 if (field->is_constant() && field->is_static()) { | |
240 // final static field | |
241 ciObject* c = field->constant_value().as_object(); | |
242 if (c->is_array()) { | |
243 ciArray* array = (ciArray*) c; | |
244 set_constant(array->length()); | |
245 } | |
0 | 246 } |
247 } | |
248 } | |
249 } | |
250 | |
251 void Canonicalizer::do_LoadIndexed (LoadIndexed* x) {} | |
252 void Canonicalizer::do_StoreIndexed (StoreIndexed* x) { | |
253 // If a value is going to be stored into a field or array some of | |
254 // the conversions emitted by javac are unneeded because the fields | |
255 // are packed to their natural size. | |
256 Convert* conv = x->value()->as_Convert(); | |
257 if (conv) { | |
258 Value value = NULL; | |
259 BasicType type = x->elt_type(); | |
260 switch (conv->op()) { | |
261 case Bytecodes::_i2b: if (type == T_BYTE) value = conv->value(); break; | |
262 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) value = conv->value(); break; | |
263 case Bytecodes::_i2c: if (type == T_CHAR || type == T_BYTE) value = conv->value(); break; | |
264 } | |
265 // limit this optimization to current block | |
266 if (value != NULL && in_current_block(conv)) { | |
267 set_canonical(new StoreIndexed(x->array(), x->index(), x->length(), | |
23614 | 268 x->elt_type(), value, x->state_before(), |
269 x->check_boolean())); | |
0 | 270 return; |
271 } | |
272 } | |
273 | |
274 | |
275 } | |
276 | |
277 | |
278 void Canonicalizer::do_NegateOp(NegateOp* x) { | |
279 ValueType* t = x->x()->type(); | |
280 if (t->is_constant()) { | |
281 switch (t->tag()) { | |
282 case intTag : set_constant(-t->as_IntConstant ()->value()); return; | |
283 case longTag : set_constant(-t->as_LongConstant ()->value()); return; | |
284 case floatTag : set_constant(-t->as_FloatConstant ()->value()); return; | |
285 case doubleTag: set_constant(-t->as_DoubleConstant()->value()); return; | |
286 default : ShouldNotReachHere(); | |
287 } | |
288 } | |
289 } | |
290 | |
291 | |
292 void Canonicalizer::do_ArithmeticOp (ArithmeticOp* x) { do_Op2(x); } | |
293 | |
294 | |
295 void Canonicalizer::do_ShiftOp (ShiftOp* x) { | |
296 ValueType* t = x->x()->type(); | |
297 ValueType* t2 = x->y()->type(); | |
298 if (t->is_constant()) { | |
299 switch (t->tag()) { | |
300 case intTag : if (t->as_IntConstant()->value() == 0) { set_constant(0); return; } break; | |
301 case longTag : if (t->as_LongConstant()->value() == (jlong)0) { set_constant(jlong_cast(0)); return; } break; | |
302 default : ShouldNotReachHere(); | |
303 } | |
304 if (t2->is_constant()) { | |
305 if (t->tag() == intTag) { | |
306 int value = t->as_IntConstant()->value(); | |
307 int shift = t2->as_IntConstant()->value() & 31; | |
308 jint mask = ~(~0 << (32 - shift)); | |
309 if (shift == 0) mask = ~0; | |
310 switch (x->op()) { | |
311 case Bytecodes::_ishl: set_constant(value << shift); return; | |
312 case Bytecodes::_ishr: set_constant(value >> shift); return; | |
313 case Bytecodes::_iushr: set_constant((value >> shift) & mask); return; | |
314 } | |
315 } else if (t->tag() == longTag) { | |
316 jlong value = t->as_LongConstant()->value(); | |
317 int shift = t2->as_IntConstant()->value() & 63; | |
318 jlong mask = ~(~jlong_cast(0) << (64 - shift)); | |
319 if (shift == 0) mask = ~jlong_cast(0); | |
320 switch (x->op()) { | |
321 case Bytecodes::_lshl: set_constant(value << shift); return; | |
322 case Bytecodes::_lshr: set_constant(value >> shift); return; | |
323 case Bytecodes::_lushr: set_constant((value >> shift) & mask); return; | |
324 } | |
325 } | |
326 } | |
327 } | |
328 if (t2->is_constant()) { | |
329 switch (t2->tag()) { | |
330 case intTag : if (t2->as_IntConstant()->value() == 0) set_canonical(x->x()); return; | |
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331 case longTag : if (t2->as_LongConstant()->value() == (jlong)0) set_canonical(x->x()); return; |
0 | 332 default : ShouldNotReachHere(); |
333 } | |
334 } | |
335 } | |
336 | |
337 | |
338 void Canonicalizer::do_LogicOp (LogicOp* x) { do_Op2(x); } | |
339 void Canonicalizer::do_CompareOp (CompareOp* x) { | |
340 if (x->x() == x->y()) { | |
341 switch (x->x()->type()->tag()) { | |
342 case longTag: set_constant(0); break; | |
343 case floatTag: { | |
344 FloatConstant* fc = x->x()->type()->as_FloatConstant(); | |
345 if (fc) { | |
346 if (g_isnan(fc->value())) { | |
347 set_constant(x->op() == Bytecodes::_fcmpl ? -1 : 1); | |
348 } else { | |
349 set_constant(0); | |
350 } | |
351 } | |
352 break; | |
353 } | |
354 case doubleTag: { | |
355 DoubleConstant* dc = x->x()->type()->as_DoubleConstant(); | |
356 if (dc) { | |
357 if (g_isnan(dc->value())) { | |
358 set_constant(x->op() == Bytecodes::_dcmpl ? -1 : 1); | |
359 } else { | |
360 set_constant(0); | |
361 } | |
362 } | |
363 break; | |
364 } | |
365 } | |
366 } else if (x->x()->type()->is_constant() && x->y()->type()->is_constant()) { | |
367 switch (x->x()->type()->tag()) { | |
368 case longTag: { | |
369 jlong vx = x->x()->type()->as_LongConstant()->value(); | |
370 jlong vy = x->y()->type()->as_LongConstant()->value(); | |
371 if (vx == vy) | |
372 set_constant(0); | |
373 else if (vx < vy) | |
374 set_constant(-1); | |
375 else | |
376 set_constant(1); | |
377 break; | |
378 } | |
379 | |
380 case floatTag: { | |
381 float vx = x->x()->type()->as_FloatConstant()->value(); | |
382 float vy = x->y()->type()->as_FloatConstant()->value(); | |
383 if (g_isnan(vx) || g_isnan(vy)) | |
384 set_constant(x->op() == Bytecodes::_fcmpl ? -1 : 1); | |
385 else if (vx == vy) | |
386 set_constant(0); | |
387 else if (vx < vy) | |
388 set_constant(-1); | |
389 else | |
390 set_constant(1); | |
391 break; | |
392 } | |
393 | |
394 case doubleTag: { | |
395 double vx = x->x()->type()->as_DoubleConstant()->value(); | |
396 double vy = x->y()->type()->as_DoubleConstant()->value(); | |
397 if (g_isnan(vx) || g_isnan(vy)) | |
398 set_constant(x->op() == Bytecodes::_dcmpl ? -1 : 1); | |
399 else if (vx == vy) | |
400 set_constant(0); | |
401 else if (vx < vy) | |
402 set_constant(-1); | |
403 else | |
404 set_constant(1); | |
405 break; | |
406 } | |
407 } | |
408 | |
409 } | |
410 } | |
411 | |
412 | |
413 void Canonicalizer::do_IfInstanceOf(IfInstanceOf* x) {} | |
414 | |
415 void Canonicalizer::do_IfOp(IfOp* x) { | |
416 // Caution: do not use do_Op2(x) here for now since | |
417 // we map the condition to the op for now! | |
418 move_const_to_right(x); | |
419 } | |
420 | |
421 | |
422 void Canonicalizer::do_Intrinsic (Intrinsic* x) { | |
423 switch (x->id()) { | |
424 case vmIntrinsics::_floatToRawIntBits : { | |
425 FloatConstant* c = x->argument_at(0)->type()->as_FloatConstant(); | |
426 if (c != NULL) { | |
427 JavaValue v; | |
428 v.set_jfloat(c->value()); | |
429 set_constant(v.get_jint()); | |
430 } | |
431 break; | |
432 } | |
433 case vmIntrinsics::_intBitsToFloat : { | |
434 IntConstant* c = x->argument_at(0)->type()->as_IntConstant(); | |
435 if (c != NULL) { | |
436 JavaValue v; | |
437 v.set_jint(c->value()); | |
438 set_constant(v.get_jfloat()); | |
439 } | |
440 break; | |
441 } | |
442 case vmIntrinsics::_doubleToRawLongBits : { | |
443 DoubleConstant* c = x->argument_at(0)->type()->as_DoubleConstant(); | |
444 if (c != NULL) { | |
445 JavaValue v; | |
446 v.set_jdouble(c->value()); | |
447 set_constant(v.get_jlong()); | |
448 } | |
449 break; | |
450 } | |
451 case vmIntrinsics::_longBitsToDouble : { | |
452 LongConstant* c = x->argument_at(0)->type()->as_LongConstant(); | |
453 if (c != NULL) { | |
454 JavaValue v; | |
455 v.set_jlong(c->value()); | |
456 set_constant(v.get_jdouble()); | |
457 } | |
458 break; | |
459 } | |
6135 | 460 case vmIntrinsics::_isInstance : { |
461 assert(x->number_of_arguments() == 2, "wrong type"); | |
462 | |
463 InstanceConstant* c = x->argument_at(0)->type()->as_InstanceConstant(); | |
464 if (c != NULL && !c->value()->is_null_object()) { | |
465 // ciInstance::java_mirror_type() returns non-NULL only for Java mirrors | |
466 ciType* t = c->value()->as_instance()->java_mirror_type(); | |
467 if (t->is_klass()) { | |
468 // substitute cls.isInstance(obj) of a constant Class into | |
469 // an InstantOf instruction | |
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470 InstanceOf* i = new InstanceOf(t->as_klass(), x->argument_at(1), x->state_before()); |
6135 | 471 set_canonical(i); |
472 // and try to canonicalize even further | |
473 do_InstanceOf(i); | |
474 } else { | |
475 assert(t->is_primitive_type(), "should be a primitive type"); | |
476 // cls.isInstance(obj) always returns false for primitive classes | |
477 set_constant(0); | |
478 } | |
479 } | |
480 break; | |
481 } | |
0 | 482 } |
483 } | |
484 | |
485 void Canonicalizer::do_Convert (Convert* x) { | |
486 if (x->value()->type()->is_constant()) { | |
487 switch (x->op()) { | |
488 case Bytecodes::_i2b: set_constant((int)((x->value()->type()->as_IntConstant()->value() << 24) >> 24)); break; | |
489 case Bytecodes::_i2s: set_constant((int)((x->value()->type()->as_IntConstant()->value() << 16) >> 16)); break; | |
490 case Bytecodes::_i2c: set_constant((int)(x->value()->type()->as_IntConstant()->value() & ((1<<16)-1))); break; | |
491 case Bytecodes::_i2l: set_constant((jlong)(x->value()->type()->as_IntConstant()->value())); break; | |
492 case Bytecodes::_i2f: set_constant((float)(x->value()->type()->as_IntConstant()->value())); break; | |
493 case Bytecodes::_i2d: set_constant((double)(x->value()->type()->as_IntConstant()->value())); break; | |
494 case Bytecodes::_l2i: set_constant((int)(x->value()->type()->as_LongConstant()->value())); break; | |
495 case Bytecodes::_l2f: set_constant(SharedRuntime::l2f(x->value()->type()->as_LongConstant()->value())); break; | |
496 case Bytecodes::_l2d: set_constant(SharedRuntime::l2d(x->value()->type()->as_LongConstant()->value())); break; | |
497 case Bytecodes::_f2d: set_constant((double)(x->value()->type()->as_FloatConstant()->value())); break; | |
498 case Bytecodes::_f2i: set_constant(SharedRuntime::f2i(x->value()->type()->as_FloatConstant()->value())); break; | |
499 case Bytecodes::_f2l: set_constant(SharedRuntime::f2l(x->value()->type()->as_FloatConstant()->value())); break; | |
500 case Bytecodes::_d2f: set_constant((float)(x->value()->type()->as_DoubleConstant()->value())); break; | |
501 case Bytecodes::_d2i: set_constant(SharedRuntime::d2i(x->value()->type()->as_DoubleConstant()->value())); break; | |
502 case Bytecodes::_d2l: set_constant(SharedRuntime::d2l(x->value()->type()->as_DoubleConstant()->value())); break; | |
503 default: | |
504 ShouldNotReachHere(); | |
505 } | |
506 } | |
507 | |
508 Value value = x->value(); | |
509 BasicType type = T_ILLEGAL; | |
510 LoadField* lf = value->as_LoadField(); | |
511 if (lf) { | |
512 type = lf->field_type(); | |
513 } else { | |
514 LoadIndexed* li = value->as_LoadIndexed(); | |
515 if (li) { | |
516 type = li->elt_type(); | |
517 } else { | |
518 Convert* conv = value->as_Convert(); | |
519 if (conv) { | |
520 switch (conv->op()) { | |
521 case Bytecodes::_i2b: type = T_BYTE; break; | |
522 case Bytecodes::_i2s: type = T_SHORT; break; | |
523 case Bytecodes::_i2c: type = T_CHAR; break; | |
524 } | |
525 } | |
526 } | |
527 } | |
528 if (type != T_ILLEGAL) { | |
529 switch (x->op()) { | |
530 case Bytecodes::_i2b: if (type == T_BYTE) set_canonical(x->value()); break; | |
531 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) set_canonical(x->value()); break; | |
532 case Bytecodes::_i2c: if (type == T_CHAR) set_canonical(x->value()); break; | |
533 } | |
534 } else { | |
535 Op2* op2 = x->value()->as_Op2(); | |
536 if (op2 && op2->op() == Bytecodes::_iand && op2->y()->type()->is_constant()) { | |
537 jint safebits = 0; | |
538 jint mask = op2->y()->type()->as_IntConstant()->value(); | |
539 switch (x->op()) { | |
540 case Bytecodes::_i2b: safebits = 0x7f; break; | |
541 case Bytecodes::_i2s: safebits = 0x7fff; break; | |
542 case Bytecodes::_i2c: safebits = 0xffff; break; | |
543 } | |
544 // When casting a masked integer to a smaller signed type, if | |
545 // the mask doesn't include the sign bit the cast isn't needed. | |
546 if (safebits && (mask & ~safebits) == 0) { | |
547 set_canonical(x->value()); | |
548 } | |
549 } | |
550 } | |
551 | |
552 } | |
553 | |
554 void Canonicalizer::do_NullCheck (NullCheck* x) { | |
555 if (x->obj()->as_NewArray() != NULL || x->obj()->as_NewInstance() != NULL) { | |
556 set_canonical(x->obj()); | |
557 } else { | |
558 Constant* con = x->obj()->as_Constant(); | |
559 if (con) { | |
560 ObjectType* c = con->type()->as_ObjectType(); | |
561 if (c && c->is_loaded()) { | |
562 ObjectConstant* oc = c->as_ObjectConstant(); | |
563 if (!oc || !oc->value()->is_null_object()) { | |
564 set_canonical(con); | |
565 } | |
566 } | |
567 } | |
568 } | |
569 } | |
570 | |
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571 void Canonicalizer::do_TypeCast (TypeCast* x) {} |
0 | 572 void Canonicalizer::do_Invoke (Invoke* x) {} |
573 void Canonicalizer::do_NewInstance (NewInstance* x) {} | |
574 void Canonicalizer::do_NewTypeArray (NewTypeArray* x) {} | |
575 void Canonicalizer::do_NewObjectArray (NewObjectArray* x) {} | |
576 void Canonicalizer::do_NewMultiArray (NewMultiArray* x) {} | |
577 void Canonicalizer::do_CheckCast (CheckCast* x) { | |
578 if (x->klass()->is_loaded()) { | |
579 Value obj = x->obj(); | |
580 ciType* klass = obj->exact_type(); | |
581 if (klass == NULL) klass = obj->declared_type(); | |
582 if (klass != NULL && klass->is_loaded() && klass->is_subtype_of(x->klass())) { | |
583 set_canonical(obj); | |
584 return; | |
585 } | |
586 // checkcast of null returns null | |
587 if (obj->as_Constant() && obj->type()->as_ObjectType()->constant_value()->is_null_object()) { | |
588 set_canonical(obj); | |
589 } | |
590 } | |
591 } | |
592 void Canonicalizer::do_InstanceOf (InstanceOf* x) { | |
593 if (x->klass()->is_loaded()) { | |
594 Value obj = x->obj(); | |
595 ciType* exact = obj->exact_type(); | |
596 if (exact != NULL && exact->is_loaded() && (obj->as_NewInstance() || obj->as_NewArray())) { | |
597 set_constant(exact->is_subtype_of(x->klass()) ? 1 : 0); | |
598 return; | |
599 } | |
600 // instanceof null returns false | |
601 if (obj->as_Constant() && obj->type()->as_ObjectType()->constant_value()->is_null_object()) { | |
602 set_constant(0); | |
603 } | |
604 } | |
605 | |
606 } | |
607 void Canonicalizer::do_MonitorEnter (MonitorEnter* x) {} | |
608 void Canonicalizer::do_MonitorExit (MonitorExit* x) {} | |
609 void Canonicalizer::do_BlockBegin (BlockBegin* x) {} | |
610 void Canonicalizer::do_Goto (Goto* x) {} | |
611 | |
612 | |
613 static bool is_true(jlong x, If::Condition cond, jlong y) { | |
614 switch (cond) { | |
615 case If::eql: return x == y; | |
616 case If::neq: return x != y; | |
617 case If::lss: return x < y; | |
618 case If::leq: return x <= y; | |
619 case If::gtr: return x > y; | |
620 case If::geq: return x >= y; | |
621 } | |
622 ShouldNotReachHere(); | |
623 return false; | |
624 } | |
625 | |
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626 static bool is_safepoint(BlockEnd* x, BlockBegin* sux) { |
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627 // An Instruction with multiple successors, x, is replaced by a Goto |
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628 // to a single successor, sux. Is a safepoint check needed = was the |
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629 // instruction being replaced a safepoint and the single remaining |
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630 // successor a back branch? |
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631 return x->is_safepoint() && (sux->bci() < x->state_before()->bci()); |
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632 } |
0 | 633 |
634 void Canonicalizer::do_If(If* x) { | |
635 // move const to right | |
636 if (x->x()->type()->is_constant()) x->swap_operands(); | |
637 // simplify | |
638 const Value l = x->x(); ValueType* lt = l->type(); | |
639 const Value r = x->y(); ValueType* rt = r->type(); | |
640 | |
641 if (l == r && !lt->is_float_kind()) { | |
642 // pattern: If (a cond a) => simplify to Goto | |
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643 BlockBegin* sux = NULL; |
0 | 644 switch (x->cond()) { |
645 case If::eql: sux = x->sux_for(true); break; | |
646 case If::neq: sux = x->sux_for(false); break; | |
647 case If::lss: sux = x->sux_for(false); break; | |
648 case If::leq: sux = x->sux_for(true); break; | |
649 case If::gtr: sux = x->sux_for(false); break; | |
650 case If::geq: sux = x->sux_for(true); break; | |
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651 default: ShouldNotReachHere(); |
0 | 652 } |
653 // If is a safepoint then the debug information should come from the state_before of the If. | |
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654 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 655 return; |
656 } | |
657 | |
658 if (lt->is_constant() && rt->is_constant()) { | |
659 if (x->x()->as_Constant() != NULL) { | |
660 // pattern: If (lc cond rc) => simplify to: Goto | |
661 BlockBegin* sux = x->x()->as_Constant()->compare(x->cond(), x->y(), | |
662 x->sux_for(true), | |
663 x->sux_for(false)); | |
664 if (sux != NULL) { | |
665 // If is a safepoint then the debug information should come from the state_before of the If. | |
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666 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 667 } |
668 } | |
669 } else if (rt->as_IntConstant() != NULL) { | |
670 // pattern: If (l cond rc) => investigate further | |
671 const jint rc = rt->as_IntConstant()->value(); | |
672 if (l->as_CompareOp() != NULL) { | |
673 // pattern: If ((a cmp b) cond rc) => simplify to: If (x cond y) or: Goto | |
674 CompareOp* cmp = l->as_CompareOp(); | |
675 bool unordered_is_less = cmp->op() == Bytecodes::_fcmpl || cmp->op() == Bytecodes::_dcmpl; | |
676 BlockBegin* lss_sux = x->sux_for(is_true(-1, x->cond(), rc)); // successor for a < b | |
677 BlockBegin* eql_sux = x->sux_for(is_true( 0, x->cond(), rc)); // successor for a = b | |
678 BlockBegin* gtr_sux = x->sux_for(is_true(+1, x->cond(), rc)); // successor for a > b | |
679 BlockBegin* nan_sux = unordered_is_less ? lss_sux : gtr_sux ; // successor for unordered | |
680 // Note: At this point all successors (lss_sux, eql_sux, gtr_sux, nan_sux) are | |
681 // equal to x->tsux() or x->fsux(). Furthermore, nan_sux equals either | |
682 // lss_sux or gtr_sux. | |
683 if (lss_sux == eql_sux && eql_sux == gtr_sux) { | |
684 // all successors identical => simplify to: Goto | |
685 set_canonical(new Goto(lss_sux, x->state_before(), x->is_safepoint())); | |
686 } else { | |
687 // two successors differ and two successors are the same => simplify to: If (x cmp y) | |
688 // determine new condition & successors | |
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689 If::Condition cond = If::eql; |
0 | 690 BlockBegin* tsux = NULL; |
691 BlockBegin* fsux = NULL; | |
692 if (lss_sux == eql_sux) { cond = If::leq; tsux = lss_sux; fsux = gtr_sux; } | |
693 else if (lss_sux == gtr_sux) { cond = If::neq; tsux = lss_sux; fsux = eql_sux; } | |
694 else if (eql_sux == gtr_sux) { cond = If::geq; tsux = eql_sux; fsux = lss_sux; } | |
695 else { ShouldNotReachHere(); } | |
1783 | 696 If* canon = new If(cmp->x(), cond, nan_sux == tsux, cmp->y(), tsux, fsux, cmp->state_before(), x->is_safepoint()); |
0 | 697 if (cmp->x() == cmp->y()) { |
698 do_If(canon); | |
699 } else { | |
1783 | 700 if (compilation()->profile_branches()) { |
701 // TODO: If profiling, leave floating point comparisons unoptimized. | |
702 // We currently do not support profiling of the unordered case. | |
703 switch(cmp->op()) { | |
704 case Bytecodes::_fcmpl: case Bytecodes::_fcmpg: | |
705 case Bytecodes::_dcmpl: case Bytecodes::_dcmpg: | |
706 set_canonical(x); | |
707 return; | |
708 } | |
709 } | |
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710 set_bci(cmp->state_before()->bci()); |
0 | 711 set_canonical(canon); |
712 } | |
713 } | |
714 } else if (l->as_InstanceOf() != NULL) { | |
715 // NOTE: Code permanently disabled for now since it leaves the old InstanceOf | |
716 // instruction in the graph (it is pinned). Need to fix this at some point. | |
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717 // It should also be left in the graph when generating a profiled method version or Goto |
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718 // has to know that it was an InstanceOf. |
0 | 719 return; |
720 // pattern: If ((obj instanceof klass) cond rc) => simplify to: IfInstanceOf or: Goto | |
721 InstanceOf* inst = l->as_InstanceOf(); | |
722 BlockBegin* is_inst_sux = x->sux_for(is_true(1, x->cond(), rc)); // successor for instanceof == 1 | |
723 BlockBegin* no_inst_sux = x->sux_for(is_true(0, x->cond(), rc)); // successor for instanceof == 0 | |
724 if (is_inst_sux == no_inst_sux && inst->is_loaded()) { | |
725 // both successors identical and klass is loaded => simplify to: Goto | |
726 set_canonical(new Goto(is_inst_sux, x->state_before(), x->is_safepoint())); | |
727 } else { | |
728 // successors differ => simplify to: IfInstanceOf | |
1819 | 729 set_canonical(new IfInstanceOf(inst->klass(), inst->obj(), true, inst->state_before()->bci(), is_inst_sux, no_inst_sux)); |
0 | 730 } |
731 } | |
732 } else if (rt == objectNull && (l->as_NewInstance() || l->as_NewArray())) { | |
733 if (x->cond() == Instruction::eql) { | |
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734 BlockBegin* sux = x->fsux(); |
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735 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 736 } else { |
737 assert(x->cond() == Instruction::neq, "only other valid case"); | |
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738 BlockBegin* sux = x->tsux(); |
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739 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 740 } |
741 } | |
742 } | |
743 | |
744 | |
745 void Canonicalizer::do_TableSwitch(TableSwitch* x) { | |
746 if (x->tag()->type()->is_constant()) { | |
747 int v = x->tag()->type()->as_IntConstant()->value(); | |
748 BlockBegin* sux = x->default_sux(); | |
749 if (v >= x->lo_key() && v <= x->hi_key()) { | |
750 sux = x->sux_at(v - x->lo_key()); | |
751 } | |
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752 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 753 } else if (x->number_of_sux() == 1) { |
754 // NOTE: Code permanently disabled for now since the switch statement's | |
755 // tag expression may produce side-effects in which case it must | |
756 // be executed. | |
757 return; | |
758 // simplify to Goto | |
759 set_canonical(new Goto(x->default_sux(), x->state_before(), x->is_safepoint())); | |
760 } else if (x->number_of_sux() == 2) { | |
761 // NOTE: Code permanently disabled for now since it produces two new nodes | |
762 // (Constant & If) and the Canonicalizer cannot return them correctly | |
763 // yet. For now we copied the corresponding code directly into the | |
764 // GraphBuilder (i.e., we should never reach here). | |
765 return; | |
766 // simplify to If | |
767 assert(x->lo_key() == x->hi_key(), "keys must be the same"); | |
768 Constant* key = new Constant(new IntConstant(x->lo_key())); | |
769 set_canonical(new If(x->tag(), If::eql, true, key, x->sux_at(0), x->default_sux(), x->state_before(), x->is_safepoint())); | |
770 } | |
771 } | |
772 | |
773 | |
774 void Canonicalizer::do_LookupSwitch(LookupSwitch* x) { | |
775 if (x->tag()->type()->is_constant()) { | |
776 int v = x->tag()->type()->as_IntConstant()->value(); | |
777 BlockBegin* sux = x->default_sux(); | |
778 for (int i = 0; i < x->length(); i++) { | |
779 if (v == x->key_at(i)) { | |
780 sux = x->sux_at(i); | |
781 } | |
782 } | |
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783 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 784 } else if (x->number_of_sux() == 1) { |
785 // NOTE: Code permanently disabled for now since the switch statement's | |
786 // tag expression may produce side-effects in which case it must | |
787 // be executed. | |
788 return; | |
789 // simplify to Goto | |
790 set_canonical(new Goto(x->default_sux(), x->state_before(), x->is_safepoint())); | |
791 } else if (x->number_of_sux() == 2) { | |
792 // NOTE: Code permanently disabled for now since it produces two new nodes | |
793 // (Constant & If) and the Canonicalizer cannot return them correctly | |
794 // yet. For now we copied the corresponding code directly into the | |
795 // GraphBuilder (i.e., we should never reach here). | |
796 return; | |
797 // simplify to If | |
798 assert(x->length() == 1, "length must be the same"); | |
799 Constant* key = new Constant(new IntConstant(x->key_at(0))); | |
800 set_canonical(new If(x->tag(), If::eql, true, key, x->sux_at(0), x->default_sux(), x->state_before(), x->is_safepoint())); | |
801 } | |
802 } | |
803 | |
804 | |
805 void Canonicalizer::do_Return (Return* x) {} | |
806 void Canonicalizer::do_Throw (Throw* x) {} | |
807 void Canonicalizer::do_Base (Base* x) {} | |
808 void Canonicalizer::do_OsrEntry (OsrEntry* x) {} | |
809 void Canonicalizer::do_ExceptionObject(ExceptionObject* x) {} | |
810 | |
811 static bool match_index_and_scale(Instruction* instr, | |
812 Instruction** index, | |
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813 int* log2_scale) { |
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814 // Skip conversion ops. This works only on 32bit because of the implicit l2i that the |
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815 // unsafe performs. |
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816 #ifndef _LP64 |
0 | 817 Convert* convert = instr->as_Convert(); |
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818 if (convert != NULL && convert->op() == Bytecodes::_i2l) { |
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819 assert(convert->value()->type() == intType, "invalid input type"); |
0 | 820 instr = convert->value(); |
821 } | |
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822 #endif |
0 | 823 |
824 ShiftOp* shift = instr->as_ShiftOp(); | |
825 if (shift != NULL) { | |
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826 if (shift->op() == Bytecodes::_lshl) { |
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827 assert(shift->x()->type() == longType, "invalid input type"); |
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828 } else { |
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829 #ifndef _LP64 |
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830 if (shift->op() == Bytecodes::_ishl) { |
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831 assert(shift->x()->type() == intType, "invalid input type"); |
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832 } else { |
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833 return false; |
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834 } |
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835 #else |
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836 return false; |
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837 #endif |
0 | 838 } |
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839 |
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840 |
0 | 841 // Constant shift value? |
842 Constant* con = shift->y()->as_Constant(); | |
843 if (con == NULL) return false; | |
844 // Well-known type and value? | |
845 IntConstant* val = con->type()->as_IntConstant(); | |
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846 assert(val != NULL, "Should be an int constant"); |
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847 |
0 | 848 *index = shift->x(); |
849 int tmp_scale = val->value(); | |
850 if (tmp_scale >= 0 && tmp_scale < 4) { | |
851 *log2_scale = tmp_scale; | |
852 return true; | |
853 } else { | |
854 return false; | |
855 } | |
856 } | |
857 | |
858 ArithmeticOp* arith = instr->as_ArithmeticOp(); | |
859 if (arith != NULL) { | |
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860 // See if either arg is a known constant |
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861 Constant* con = arith->x()->as_Constant(); |
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862 if (con != NULL) { |
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863 *index = arith->y(); |
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864 } else { |
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865 con = arith->y()->as_Constant(); |
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866 if (con == NULL) return false; |
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867 *index = arith->x(); |
0 | 868 } |
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869 long const_value; |
0 | 870 // Check for integer multiply |
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871 if (arith->op() == Bytecodes::_lmul) { |
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872 assert((*index)->type() == longType, "invalid input type"); |
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873 LongConstant* val = con->type()->as_LongConstant(); |
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874 assert(val != NULL, "expecting a long constant"); |
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875 const_value = val->value(); |
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876 } else { |
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877 #ifndef _LP64 |
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878 if (arith->op() == Bytecodes::_imul) { |
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879 assert((*index)->type() == intType, "invalid input type"); |
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880 IntConstant* val = con->type()->as_IntConstant(); |
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881 assert(val != NULL, "expecting an int constant"); |
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882 const_value = val->value(); |
0 | 883 } else { |
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884 return false; |
0 | 885 } |
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886 #else |
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887 return false; |
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888 #endif |
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889 } |
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890 switch (const_value) { |
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891 case 1: *log2_scale = 0; return true; |
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892 case 2: *log2_scale = 1; return true; |
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893 case 4: *log2_scale = 2; return true; |
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894 case 8: *log2_scale = 3; return true; |
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895 default: return false; |
0 | 896 } |
897 } | |
898 | |
899 // Unknown instruction sequence; don't touch it | |
900 return false; | |
901 } | |
902 | |
903 | |
904 static bool match(UnsafeRawOp* x, | |
905 Instruction** base, | |
906 Instruction** index, | |
907 int* log2_scale) { | |
908 ArithmeticOp* root = x->base()->as_ArithmeticOp(); | |
909 if (root == NULL) return false; | |
910 // Limit ourselves to addition for now | |
911 if (root->op() != Bytecodes::_ladd) return false; | |
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912 |
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913 bool match_found = false; |
0 | 914 // Try to find shift or scale op |
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915 if (match_index_and_scale(root->y(), index, log2_scale)) { |
0 | 916 *base = root->x(); |
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917 match_found = true; |
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918 } else if (match_index_and_scale(root->x(), index, log2_scale)) { |
0 | 919 *base = root->y(); |
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920 match_found = true; |
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921 } else if (NOT_LP64(root->y()->as_Convert() != NULL) LP64_ONLY(false)) { |
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922 // Skipping i2l works only on 32bit because of the implicit l2i that the unsafe performs. |
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923 // 64bit needs a real sign-extending conversion. |
0 | 924 Convert* convert = root->y()->as_Convert(); |
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925 if (convert->op() == Bytecodes::_i2l) { |
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926 assert(convert->value()->type() == intType, "should be an int"); |
0 | 927 // pick base and index, setting scale at 1 |
928 *base = root->x(); | |
929 *index = convert->value(); | |
930 *log2_scale = 0; | |
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931 match_found = true; |
0 | 932 } |
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933 } |
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934 // The default solution |
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935 if (!match_found) { |
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936 *base = root->x(); |
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937 *index = root->y(); |
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938 *log2_scale = 0; |
0 | 939 } |
940 | |
941 // If the value is pinned then it will be always be computed so | |
942 // there's no profit to reshaping the expression. | |
943 return !root->is_pinned(); | |
944 } | |
945 | |
946 | |
947 void Canonicalizer::do_UnsafeRawOp(UnsafeRawOp* x) { | |
948 Instruction* base = NULL; | |
949 Instruction* index = NULL; | |
950 int log2_scale; | |
951 | |
952 if (match(x, &base, &index, &log2_scale)) { | |
953 x->set_base(base); | |
954 x->set_index(index); | |
955 x->set_log2_scale(log2_scale); | |
956 if (PrintUnsafeOptimization) { | |
957 tty->print_cr("Canonicalizer: UnsafeRawOp id %d: base = id %d, index = id %d, log2_scale = %d", | |
958 x->id(), x->base()->id(), x->index()->id(), x->log2_scale()); | |
959 } | |
960 } | |
961 } | |
962 | |
963 void Canonicalizer::do_RoundFP(RoundFP* x) {} | |
964 void Canonicalizer::do_UnsafeGetRaw(UnsafeGetRaw* x) { if (OptimizeUnsafes) do_UnsafeRawOp(x); } | |
965 void Canonicalizer::do_UnsafePutRaw(UnsafePutRaw* x) { if (OptimizeUnsafes) do_UnsafeRawOp(x); } | |
966 void Canonicalizer::do_UnsafeGetObject(UnsafeGetObject* x) {} | |
967 void Canonicalizer::do_UnsafePutObject(UnsafePutObject* x) {} | |
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968 void Canonicalizer::do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) {} |
0 | 969 void Canonicalizer::do_UnsafePrefetchRead (UnsafePrefetchRead* x) {} |
970 void Canonicalizer::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) {} | |
971 void Canonicalizer::do_ProfileCall(ProfileCall* x) {} | |
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972 void Canonicalizer::do_ProfileReturnType(ProfileReturnType* x) {} |
1783 | 973 void Canonicalizer::do_ProfileInvoke(ProfileInvoke* x) {} |
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974 void Canonicalizer::do_RuntimeCall(RuntimeCall* x) {} |
8860 | 975 void Canonicalizer::do_RangeCheckPredicate(RangeCheckPredicate* x) {} |
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976 #ifdef ASSERT |
8860 | 977 void Canonicalizer::do_Assert(Assert* x) {} |
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978 #endif |
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979 void Canonicalizer::do_MemBar(MemBar* x) {} |