Mercurial > hg > truffle
annotate src/share/vm/shark/sharkTopLevelBlock.cpp @ 4994:e37be4557f0b
Small fix for windows.
author | Andreas Woess <andreas.woess@jku.at> |
---|---|
date | Tue, 28 Feb 2012 18:57:46 +0100 |
parents | 069ab3f976d3 |
children | da91efe96a93 |
rev | line source |
---|---|
1692 | 1 /* |
1972 | 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
1692 | 3 * Copyright 2008, 2009, 2010 Red Hat, Inc. |
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
5 * | |
6 * This code is free software; you can redistribute it and/or modify it | |
7 * under the terms of the GNU General Public License version 2 only, as | |
8 * published by the Free Software Foundation. | |
9 * | |
10 * This code is distributed in the hope that it will be useful, but WITHOUT | |
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 * version 2 for more details (a copy is included in the LICENSE file that | |
14 * accompanied this code). | |
15 * | |
16 * You should have received a copy of the GNU General Public License version | |
17 * 2 along with this work; if not, write to the Free Software Foundation, | |
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 * | |
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
21 * or visit www.oracle.com if you need additional information or have any | |
22 * questions. | |
23 * | |
24 */ | |
25 | |
1972 | 26 #include "precompiled.hpp" |
27 #include "ci/ciField.hpp" | |
28 #include "ci/ciInstance.hpp" | |
29 #include "ci/ciObjArrayKlass.hpp" | |
30 #include "ci/ciStreams.hpp" | |
31 #include "ci/ciType.hpp" | |
32 #include "ci/ciTypeFlow.hpp" | |
33 #include "interpreter/bytecodes.hpp" | |
34 #include "memory/allocation.hpp" | |
35 #include "runtime/deoptimization.hpp" | |
36 #include "shark/llvmHeaders.hpp" | |
37 #include "shark/llvmValue.hpp" | |
38 #include "shark/sharkBuilder.hpp" | |
39 #include "shark/sharkCacheDecache.hpp" | |
40 #include "shark/sharkConstant.hpp" | |
41 #include "shark/sharkInliner.hpp" | |
42 #include "shark/sharkState.hpp" | |
43 #include "shark/sharkTopLevelBlock.hpp" | |
44 #include "shark/sharkValue.hpp" | |
45 #include "shark/shark_globals.hpp" | |
46 #include "utilities/debug.hpp" | |
1692 | 47 |
48 using namespace llvm; | |
49 | |
50 void SharkTopLevelBlock::scan_for_traps() { | |
51 // If typeflow found a trap then don't scan past it | |
52 int limit_bci = ciblock()->has_trap() ? ciblock()->trap_bci() : limit(); | |
53 | |
54 // Scan the bytecode for traps that are always hit | |
55 iter()->reset_to_bci(start()); | |
56 while (iter()->next_bci() < limit_bci) { | |
57 iter()->next(); | |
58 | |
59 ciField *field; | |
60 ciMethod *method; | |
61 ciInstanceKlass *klass; | |
62 bool will_link; | |
63 bool is_field; | |
64 | |
65 switch (bc()) { | |
66 case Bytecodes::_ldc: | |
67 case Bytecodes::_ldc_w: | |
68 if (!SharkConstant::for_ldc(iter())->is_loaded()) { | |
69 set_trap( | |
70 Deoptimization::make_trap_request( | |
71 Deoptimization::Reason_uninitialized, | |
72 Deoptimization::Action_reinterpret), bci()); | |
73 return; | |
74 } | |
75 break; | |
76 | |
77 case Bytecodes::_getfield: | |
78 case Bytecodes::_getstatic: | |
79 case Bytecodes::_putfield: | |
80 case Bytecodes::_putstatic: | |
81 field = iter()->get_field(will_link); | |
82 assert(will_link, "typeflow responsibility"); | |
83 is_field = (bc() == Bytecodes::_getfield || bc() == Bytecodes::_putfield); | |
84 | |
85 // If the bytecode does not match the field then bail out to | |
86 // the interpreter to throw an IncompatibleClassChangeError | |
87 if (is_field == field->is_static()) { | |
88 set_trap( | |
89 Deoptimization::make_trap_request( | |
90 Deoptimization::Reason_unhandled, | |
91 Deoptimization::Action_none), bci()); | |
92 return; | |
93 } | |
94 | |
95 // Bail out if we are trying to access a static variable | |
96 // before the class initializer has completed. | |
97 if (!is_field && !field->holder()->is_initialized()) { | |
98 if (!static_field_ok_in_clinit(field)) { | |
99 set_trap( | |
100 Deoptimization::make_trap_request( | |
101 Deoptimization::Reason_uninitialized, | |
102 Deoptimization::Action_reinterpret), bci()); | |
103 return; | |
104 } | |
105 } | |
106 break; | |
107 | |
108 case Bytecodes::_invokestatic: | |
109 case Bytecodes::_invokespecial: | |
110 case Bytecodes::_invokevirtual: | |
111 case Bytecodes::_invokeinterface: | |
112 method = iter()->get_method(will_link); | |
113 assert(will_link, "typeflow responsibility"); | |
114 | |
115 if (!method->holder()->is_linked()) { | |
116 set_trap( | |
117 Deoptimization::make_trap_request( | |
118 Deoptimization::Reason_uninitialized, | |
119 Deoptimization::Action_reinterpret), bci()); | |
120 return; | |
121 } | |
122 | |
123 if (bc() == Bytecodes::_invokevirtual) { | |
124 klass = ciEnv::get_instance_klass_for_declared_method_holder( | |
125 iter()->get_declared_method_holder()); | |
126 if (!klass->is_linked()) { | |
127 set_trap( | |
128 Deoptimization::make_trap_request( | |
129 Deoptimization::Reason_uninitialized, | |
130 Deoptimization::Action_reinterpret), bci()); | |
131 return; | |
132 } | |
133 } | |
134 break; | |
135 | |
136 case Bytecodes::_new: | |
137 klass = iter()->get_klass(will_link)->as_instance_klass(); | |
138 assert(will_link, "typeflow responsibility"); | |
139 | |
140 // Bail out if the class is unloaded | |
141 if (iter()->is_unresolved_klass() || !klass->is_initialized()) { | |
142 set_trap( | |
143 Deoptimization::make_trap_request( | |
144 Deoptimization::Reason_uninitialized, | |
145 Deoptimization::Action_reinterpret), bci()); | |
146 return; | |
147 } | |
148 | |
149 // Bail out if the class cannot be instantiated | |
150 if (klass->is_abstract() || klass->is_interface() || | |
151 klass->name() == ciSymbol::java_lang_Class()) { | |
152 set_trap( | |
153 Deoptimization::make_trap_request( | |
154 Deoptimization::Reason_unhandled, | |
155 Deoptimization::Action_reinterpret), bci()); | |
156 return; | |
157 } | |
158 break; | |
159 } | |
160 } | |
161 | |
162 // Trap if typeflow trapped (and we didn't before) | |
163 if (ciblock()->has_trap()) { | |
164 set_trap( | |
165 Deoptimization::make_trap_request( | |
166 Deoptimization::Reason_unloaded, | |
167 Deoptimization::Action_reinterpret, | |
168 ciblock()->trap_index()), ciblock()->trap_bci()); | |
169 return; | |
170 } | |
171 } | |
172 | |
173 bool SharkTopLevelBlock::static_field_ok_in_clinit(ciField* field) { | |
174 assert(field->is_static(), "should be"); | |
175 | |
176 // This code is lifted pretty much verbatim from C2's | |
177 // Parse::static_field_ok_in_clinit() in parse3.cpp. | |
178 bool access_OK = false; | |
179 if (target()->holder()->is_subclass_of(field->holder())) { | |
180 if (target()->is_static()) { | |
181 if (target()->name() == ciSymbol::class_initializer_name()) { | |
182 // It's OK to access static fields from the class initializer | |
183 access_OK = true; | |
184 } | |
185 } | |
186 else { | |
187 if (target()->name() == ciSymbol::object_initializer_name()) { | |
188 // It's also OK to access static fields inside a constructor, | |
189 // because any thread calling the constructor must first have | |
190 // synchronized on the class by executing a "new" bytecode. | |
191 access_OK = true; | |
192 } | |
193 } | |
194 } | |
195 return access_OK; | |
196 } | |
197 | |
198 SharkState* SharkTopLevelBlock::entry_state() { | |
199 if (_entry_state == NULL) { | |
200 assert(needs_phis(), "should do"); | |
201 _entry_state = new SharkPHIState(this); | |
202 } | |
203 return _entry_state; | |
204 } | |
205 | |
206 void SharkTopLevelBlock::add_incoming(SharkState* incoming_state) { | |
207 if (needs_phis()) { | |
208 ((SharkPHIState *) entry_state())->add_incoming(incoming_state); | |
209 } | |
210 else if (_entry_state == NULL) { | |
211 _entry_state = incoming_state; | |
212 } | |
213 else { | |
214 assert(entry_state()->equal_to(incoming_state), "should be"); | |
215 } | |
216 } | |
217 | |
218 void SharkTopLevelBlock::enter(SharkTopLevelBlock* predecessor, | |
219 bool is_exception) { | |
220 // This block requires phis: | |
221 // - if it is entered more than once | |
222 // - if it is an exception handler, because in which | |
223 // case we assume it's entered more than once. | |
224 // - if the predecessor will be compiled after this | |
225 // block, in which case we can't simple propagate | |
226 // the state forward. | |
227 if (!needs_phis() && | |
228 (entered() || | |
229 is_exception || | |
230 (predecessor && predecessor->index() >= index()))) | |
231 _needs_phis = true; | |
232 | |
233 // Recurse into the tree | |
234 if (!entered()) { | |
235 _entered = true; | |
236 | |
237 scan_for_traps(); | |
238 if (!has_trap()) { | |
239 for (int i = 0; i < num_successors(); i++) { | |
240 successor(i)->enter(this, false); | |
241 } | |
242 } | |
243 compute_exceptions(); | |
244 for (int i = 0; i < num_exceptions(); i++) { | |
245 SharkTopLevelBlock *handler = exception(i); | |
246 if (handler) | |
247 handler->enter(this, true); | |
248 } | |
249 } | |
250 } | |
251 | |
252 void SharkTopLevelBlock::initialize() { | |
253 char name[28]; | |
254 snprintf(name, sizeof(name), | |
255 "bci_%d%s", | |
256 start(), is_backedge_copy() ? "_backedge_copy" : ""); | |
257 _entry_block = function()->CreateBlock(name); | |
258 } | |
259 | |
260 void SharkTopLevelBlock::decache_for_Java_call(ciMethod *callee) { | |
261 SharkJavaCallDecacher(function(), bci(), callee).scan(current_state()); | |
262 for (int i = 0; i < callee->arg_size(); i++) | |
263 xpop(); | |
264 } | |
265 | |
266 void SharkTopLevelBlock::cache_after_Java_call(ciMethod *callee) { | |
267 if (callee->return_type()->size()) { | |
268 ciType *type; | |
269 switch (callee->return_type()->basic_type()) { | |
270 case T_BOOLEAN: | |
271 case T_BYTE: | |
272 case T_CHAR: | |
273 case T_SHORT: | |
274 type = ciType::make(T_INT); | |
275 break; | |
276 | |
277 default: | |
278 type = callee->return_type(); | |
279 } | |
280 | |
281 push(SharkValue::create_generic(type, NULL, false)); | |
282 } | |
283 SharkJavaCallCacher(function(), callee).scan(current_state()); | |
284 } | |
285 | |
286 void SharkTopLevelBlock::decache_for_VM_call() { | |
287 SharkVMCallDecacher(function(), bci()).scan(current_state()); | |
288 } | |
289 | |
290 void SharkTopLevelBlock::cache_after_VM_call() { | |
291 SharkVMCallCacher(function()).scan(current_state()); | |
292 } | |
293 | |
294 void SharkTopLevelBlock::decache_for_trap() { | |
295 SharkTrapDecacher(function(), bci()).scan(current_state()); | |
296 } | |
297 | |
298 void SharkTopLevelBlock::emit_IR() { | |
299 builder()->SetInsertPoint(entry_block()); | |
300 | |
301 // Parse the bytecode | |
302 parse_bytecode(start(), limit()); | |
303 | |
304 // If this block falls through to the next then it won't have been | |
305 // terminated by a bytecode and we have to add the branch ourselves | |
306 if (falls_through() && !has_trap()) | |
307 do_branch(ciTypeFlow::FALL_THROUGH); | |
308 } | |
309 | |
310 SharkTopLevelBlock* SharkTopLevelBlock::bci_successor(int bci) const { | |
311 // XXX now with Linear Search Technology (tm) | |
312 for (int i = 0; i < num_successors(); i++) { | |
313 ciTypeFlow::Block *successor = ciblock()->successors()->at(i); | |
314 if (successor->start() == bci) | |
315 return function()->block(successor->pre_order()); | |
316 } | |
317 ShouldNotReachHere(); | |
318 } | |
319 | |
320 void SharkTopLevelBlock::do_zero_check(SharkValue *value) { | |
321 if (value->is_phi() && value->as_phi()->all_incomers_zero_checked()) { | |
322 function()->add_deferred_zero_check(this, value); | |
323 } | |
324 else { | |
325 BasicBlock *continue_block = function()->CreateBlock("not_zero"); | |
326 SharkState *saved_state = current_state(); | |
327 set_current_state(saved_state->copy()); | |
328 zero_check_value(value, continue_block); | |
329 builder()->SetInsertPoint(continue_block); | |
330 set_current_state(saved_state); | |
331 } | |
332 | |
333 value->set_zero_checked(true); | |
334 } | |
335 | |
336 void SharkTopLevelBlock::do_deferred_zero_check(SharkValue* value, | |
337 int bci, | |
338 SharkState* saved_state, | |
339 BasicBlock* continue_block) { | |
340 if (value->as_phi()->all_incomers_zero_checked()) { | |
341 builder()->CreateBr(continue_block); | |
342 } | |
343 else { | |
344 iter()->force_bci(start()); | |
345 set_current_state(saved_state); | |
346 zero_check_value(value, continue_block); | |
347 } | |
348 } | |
349 | |
350 void SharkTopLevelBlock::zero_check_value(SharkValue* value, | |
351 BasicBlock* continue_block) { | |
352 BasicBlock *zero_block = builder()->CreateBlock(continue_block, "zero"); | |
353 | |
354 Value *a, *b; | |
355 switch (value->basic_type()) { | |
356 case T_BYTE: | |
357 case T_CHAR: | |
358 case T_SHORT: | |
359 case T_INT: | |
360 a = value->jint_value(); | |
361 b = LLVMValue::jint_constant(0); | |
362 break; | |
363 case T_LONG: | |
364 a = value->jlong_value(); | |
365 b = LLVMValue::jlong_constant(0); | |
366 break; | |
367 case T_OBJECT: | |
368 case T_ARRAY: | |
369 a = value->jobject_value(); | |
370 b = LLVMValue::LLVMValue::null(); | |
371 break; | |
372 default: | |
373 tty->print_cr("Unhandled type %s", type2name(value->basic_type())); | |
374 ShouldNotReachHere(); | |
375 } | |
376 | |
377 builder()->CreateCondBr( | |
378 builder()->CreateICmpNE(a, b), continue_block, zero_block); | |
379 | |
380 builder()->SetInsertPoint(zero_block); | |
381 if (value->is_jobject()) { | |
382 call_vm( | |
383 builder()->throw_NullPointerException(), | |
384 builder()->CreateIntToPtr( | |
385 LLVMValue::intptr_constant((intptr_t) __FILE__), | |
386 PointerType::getUnqual(SharkType::jbyte_type())), | |
387 LLVMValue::jint_constant(__LINE__), | |
388 EX_CHECK_NONE); | |
389 } | |
390 else { | |
391 call_vm( | |
392 builder()->throw_ArithmeticException(), | |
393 builder()->CreateIntToPtr( | |
394 LLVMValue::intptr_constant((intptr_t) __FILE__), | |
395 PointerType::getUnqual(SharkType::jbyte_type())), | |
396 LLVMValue::jint_constant(__LINE__), | |
397 EX_CHECK_NONE); | |
398 } | |
399 | |
400 Value *pending_exception = get_pending_exception(); | |
401 clear_pending_exception(); | |
402 handle_exception(pending_exception, EX_CHECK_FULL); | |
403 } | |
404 | |
405 void SharkTopLevelBlock::check_bounds(SharkValue* array, SharkValue* index) { | |
406 BasicBlock *out_of_bounds = function()->CreateBlock("out_of_bounds"); | |
407 BasicBlock *in_bounds = function()->CreateBlock("in_bounds"); | |
408 | |
409 Value *length = builder()->CreateArrayLength(array->jarray_value()); | |
410 // we use an unsigned comparison to catch negative values | |
411 builder()->CreateCondBr( | |
412 builder()->CreateICmpULT(index->jint_value(), length), | |
413 in_bounds, out_of_bounds); | |
414 | |
415 builder()->SetInsertPoint(out_of_bounds); | |
416 SharkState *saved_state = current_state()->copy(); | |
417 | |
418 call_vm( | |
419 builder()->throw_ArrayIndexOutOfBoundsException(), | |
420 builder()->CreateIntToPtr( | |
421 LLVMValue::intptr_constant((intptr_t) __FILE__), | |
422 PointerType::getUnqual(SharkType::jbyte_type())), | |
423 LLVMValue::jint_constant(__LINE__), | |
424 index->jint_value(), | |
425 EX_CHECK_NONE); | |
426 | |
427 Value *pending_exception = get_pending_exception(); | |
428 clear_pending_exception(); | |
429 handle_exception(pending_exception, EX_CHECK_FULL); | |
430 | |
431 set_current_state(saved_state); | |
432 | |
433 builder()->SetInsertPoint(in_bounds); | |
434 } | |
435 | |
436 void SharkTopLevelBlock::check_pending_exception(int action) { | |
437 assert(action & EAM_CHECK, "should be"); | |
438 | |
439 BasicBlock *exception = function()->CreateBlock("exception"); | |
440 BasicBlock *no_exception = function()->CreateBlock("no_exception"); | |
441 | |
442 Value *pending_exception = get_pending_exception(); | |
443 builder()->CreateCondBr( | |
444 builder()->CreateICmpEQ(pending_exception, LLVMValue::null()), | |
445 no_exception, exception); | |
446 | |
447 builder()->SetInsertPoint(exception); | |
448 SharkState *saved_state = current_state()->copy(); | |
449 if (action & EAM_MONITOR_FUDGE) { | |
450 // The top monitor is marked live, but the exception was thrown | |
451 // while setting it up so we need to mark it dead before we enter | |
452 // any exception handlers as they will not expect it to be there. | |
453 set_num_monitors(num_monitors() - 1); | |
454 action ^= EAM_MONITOR_FUDGE; | |
455 } | |
456 clear_pending_exception(); | |
457 handle_exception(pending_exception, action); | |
458 set_current_state(saved_state); | |
459 | |
460 builder()->SetInsertPoint(no_exception); | |
461 } | |
462 | |
463 void SharkTopLevelBlock::compute_exceptions() { | |
464 ciExceptionHandlerStream str(target(), start()); | |
465 | |
466 int exc_count = str.count(); | |
467 _exc_handlers = new GrowableArray<ciExceptionHandler*>(exc_count); | |
468 _exceptions = new GrowableArray<SharkTopLevelBlock*>(exc_count); | |
469 | |
470 int index = 0; | |
471 for (; !str.is_done(); str.next()) { | |
472 ciExceptionHandler *handler = str.handler(); | |
473 if (handler->handler_bci() == -1) | |
474 break; | |
475 _exc_handlers->append(handler); | |
476 | |
477 // Try and get this exception's handler from typeflow. We should | |
478 // do it this way always, really, except that typeflow sometimes | |
479 // doesn't record exceptions, even loaded ones, and sometimes it | |
480 // returns them with a different handler bci. Why??? | |
481 SharkTopLevelBlock *block = NULL; | |
482 ciInstanceKlass* klass; | |
483 if (handler->is_catch_all()) { | |
484 klass = java_lang_Throwable_klass(); | |
485 } | |
486 else { | |
487 klass = handler->catch_klass(); | |
488 } | |
489 for (int i = 0; i < ciblock()->exceptions()->length(); i++) { | |
490 if (klass == ciblock()->exc_klasses()->at(i)) { | |
491 block = function()->block(ciblock()->exceptions()->at(i)->pre_order()); | |
492 if (block->start() == handler->handler_bci()) | |
493 break; | |
494 else | |
495 block = NULL; | |
496 } | |
497 } | |
498 | |
499 // If typeflow let us down then try and figure it out ourselves | |
500 if (block == NULL) { | |
501 for (int i = 0; i < function()->block_count(); i++) { | |
502 SharkTopLevelBlock *candidate = function()->block(i); | |
503 if (candidate->start() == handler->handler_bci()) { | |
504 if (block != NULL) { | |
505 NOT_PRODUCT(warning("there may be trouble ahead")); | |
506 block = NULL; | |
507 break; | |
508 } | |
509 block = candidate; | |
510 } | |
511 } | |
512 } | |
513 _exceptions->append(block); | |
514 } | |
515 } | |
516 | |
517 void SharkTopLevelBlock::handle_exception(Value* exception, int action) { | |
518 if (action & EAM_HANDLE && num_exceptions() != 0) { | |
519 // Clear the stack and push the exception onto it | |
520 while (xstack_depth()) | |
521 pop(); | |
522 push(SharkValue::create_jobject(exception, true)); | |
523 | |
524 // Work out how many options we have to check | |
525 bool has_catch_all = exc_handler(num_exceptions() - 1)->is_catch_all(); | |
526 int num_options = num_exceptions(); | |
527 if (has_catch_all) | |
528 num_options--; | |
529 | |
530 // Marshal any non-catch-all handlers | |
531 if (num_options > 0) { | |
532 bool all_loaded = true; | |
533 for (int i = 0; i < num_options; i++) { | |
534 if (!exc_handler(i)->catch_klass()->is_loaded()) { | |
535 all_loaded = false; | |
536 break; | |
537 } | |
538 } | |
539 | |
540 if (all_loaded) | |
541 marshal_exception_fast(num_options); | |
542 else | |
543 marshal_exception_slow(num_options); | |
544 } | |
545 | |
546 // Install the catch-all handler, if present | |
547 if (has_catch_all) { | |
548 SharkTopLevelBlock* handler = this->exception(num_options); | |
549 assert(handler != NULL, "catch-all handler cannot be unloaded"); | |
550 | |
551 builder()->CreateBr(handler->entry_block()); | |
552 handler->add_incoming(current_state()); | |
553 return; | |
554 } | |
555 } | |
556 | |
557 // No exception handler was found; unwind and return | |
558 handle_return(T_VOID, exception); | |
559 } | |
560 | |
561 void SharkTopLevelBlock::marshal_exception_fast(int num_options) { | |
562 Value *exception_klass = builder()->CreateValueOfStructEntry( | |
563 xstack(0)->jobject_value(), | |
564 in_ByteSize(oopDesc::klass_offset_in_bytes()), | |
565 SharkType::oop_type(), | |
566 "exception_klass"); | |
567 | |
568 for (int i = 0; i < num_options; i++) { | |
569 Value *check_klass = | |
570 builder()->CreateInlineOop(exc_handler(i)->catch_klass()); | |
571 | |
572 BasicBlock *not_exact = function()->CreateBlock("not_exact"); | |
573 BasicBlock *not_subtype = function()->CreateBlock("not_subtype"); | |
574 | |
575 builder()->CreateCondBr( | |
576 builder()->CreateICmpEQ(check_klass, exception_klass), | |
577 handler_for_exception(i), not_exact); | |
578 | |
579 builder()->SetInsertPoint(not_exact); | |
580 builder()->CreateCondBr( | |
581 builder()->CreateICmpNE( | |
582 builder()->CreateCall2( | |
583 builder()->is_subtype_of(), check_klass, exception_klass), | |
584 LLVMValue::jbyte_constant(0)), | |
585 handler_for_exception(i), not_subtype); | |
586 | |
587 builder()->SetInsertPoint(not_subtype); | |
588 } | |
589 } | |
590 | |
591 void SharkTopLevelBlock::marshal_exception_slow(int num_options) { | |
592 int *indexes = NEW_RESOURCE_ARRAY(int, num_options); | |
593 for (int i = 0; i < num_options; i++) | |
594 indexes[i] = exc_handler(i)->catch_klass_index(); | |
595 | |
596 Value *index = call_vm( | |
597 builder()->find_exception_handler(), | |
598 builder()->CreateInlineData( | |
599 indexes, | |
600 num_options * sizeof(int), | |
601 PointerType::getUnqual(SharkType::jint_type())), | |
602 LLVMValue::jint_constant(num_options), | |
603 EX_CHECK_NO_CATCH); | |
604 | |
605 BasicBlock *no_handler = function()->CreateBlock("no_handler"); | |
606 SwitchInst *switchinst = builder()->CreateSwitch( | |
607 index, no_handler, num_options); | |
608 | |
609 for (int i = 0; i < num_options; i++) { | |
610 switchinst->addCase( | |
611 LLVMValue::jint_constant(i), | |
612 handler_for_exception(i)); | |
613 } | |
614 | |
615 builder()->SetInsertPoint(no_handler); | |
616 } | |
617 | |
618 BasicBlock* SharkTopLevelBlock::handler_for_exception(int index) { | |
619 SharkTopLevelBlock *successor = this->exception(index); | |
620 if (successor) { | |
621 successor->add_incoming(current_state()); | |
622 return successor->entry_block(); | |
623 } | |
624 else { | |
625 return make_trap( | |
626 exc_handler(index)->handler_bci(), | |
627 Deoptimization::make_trap_request( | |
628 Deoptimization::Reason_unhandled, | |
629 Deoptimization::Action_reinterpret)); | |
630 } | |
631 } | |
632 | |
633 void SharkTopLevelBlock::maybe_add_safepoint() { | |
634 if (current_state()->has_safepointed()) | |
635 return; | |
636 | |
637 BasicBlock *orig_block = builder()->GetInsertBlock(); | |
638 SharkState *orig_state = current_state()->copy(); | |
639 | |
640 BasicBlock *do_safepoint = function()->CreateBlock("do_safepoint"); | |
641 BasicBlock *safepointed = function()->CreateBlock("safepointed"); | |
642 | |
643 Value *state = builder()->CreateLoad( | |
644 builder()->CreateIntToPtr( | |
645 LLVMValue::intptr_constant( | |
646 (intptr_t) SafepointSynchronize::address_of_state()), | |
647 PointerType::getUnqual(SharkType::jint_type())), | |
648 "state"); | |
649 | |
650 builder()->CreateCondBr( | |
651 builder()->CreateICmpEQ( | |
652 state, | |
653 LLVMValue::jint_constant(SafepointSynchronize::_synchronizing)), | |
654 do_safepoint, safepointed); | |
655 | |
656 builder()->SetInsertPoint(do_safepoint); | |
657 call_vm(builder()->safepoint(), EX_CHECK_FULL); | |
658 BasicBlock *safepointed_block = builder()->GetInsertBlock(); | |
659 builder()->CreateBr(safepointed); | |
660 | |
661 builder()->SetInsertPoint(safepointed); | |
662 current_state()->merge(orig_state, orig_block, safepointed_block); | |
663 | |
664 current_state()->set_has_safepointed(true); | |
665 } | |
666 | |
667 void SharkTopLevelBlock::maybe_add_backedge_safepoint() { | |
668 if (current_state()->has_safepointed()) | |
669 return; | |
670 | |
671 for (int i = 0; i < num_successors(); i++) { | |
672 if (successor(i)->can_reach(this)) { | |
673 maybe_add_safepoint(); | |
674 break; | |
675 } | |
676 } | |
677 } | |
678 | |
679 bool SharkTopLevelBlock::can_reach(SharkTopLevelBlock* other) { | |
680 for (int i = 0; i < function()->block_count(); i++) | |
681 function()->block(i)->_can_reach_visited = false; | |
682 | |
683 return can_reach_helper(other); | |
684 } | |
685 | |
686 bool SharkTopLevelBlock::can_reach_helper(SharkTopLevelBlock* other) { | |
687 if (this == other) | |
688 return true; | |
689 | |
690 if (_can_reach_visited) | |
691 return false; | |
692 _can_reach_visited = true; | |
693 | |
694 if (!has_trap()) { | |
695 for (int i = 0; i < num_successors(); i++) { | |
696 if (successor(i)->can_reach_helper(other)) | |
697 return true; | |
698 } | |
699 } | |
700 | |
701 for (int i = 0; i < num_exceptions(); i++) { | |
702 SharkTopLevelBlock *handler = exception(i); | |
703 if (handler && handler->can_reach_helper(other)) | |
704 return true; | |
705 } | |
706 | |
707 return false; | |
708 } | |
709 | |
710 BasicBlock* SharkTopLevelBlock::make_trap(int trap_bci, int trap_request) { | |
711 BasicBlock *trap_block = function()->CreateBlock("trap"); | |
712 BasicBlock *orig_block = builder()->GetInsertBlock(); | |
713 builder()->SetInsertPoint(trap_block); | |
714 | |
715 int orig_bci = bci(); | |
716 iter()->force_bci(trap_bci); | |
717 | |
718 do_trap(trap_request); | |
719 | |
720 builder()->SetInsertPoint(orig_block); | |
721 iter()->force_bci(orig_bci); | |
722 | |
723 return trap_block; | |
724 } | |
725 | |
726 void SharkTopLevelBlock::do_trap(int trap_request) { | |
727 decache_for_trap(); | |
728 builder()->CreateRet( | |
729 builder()->CreateCall2( | |
730 builder()->uncommon_trap(), | |
731 thread(), | |
732 LLVMValue::jint_constant(trap_request))); | |
733 } | |
734 | |
735 void SharkTopLevelBlock::call_register_finalizer(Value *receiver) { | |
736 BasicBlock *orig_block = builder()->GetInsertBlock(); | |
737 SharkState *orig_state = current_state()->copy(); | |
738 | |
739 BasicBlock *do_call = function()->CreateBlock("has_finalizer"); | |
740 BasicBlock *done = function()->CreateBlock("done"); | |
741 | |
742 Value *klass = builder()->CreateValueOfStructEntry( | |
743 receiver, | |
744 in_ByteSize(oopDesc::klass_offset_in_bytes()), | |
745 SharkType::oop_type(), | |
746 "klass"); | |
747 | |
4762
069ab3f976d3
7118863: Move sizeof(klassOopDesc) into the *Klass::*_offset_in_bytes() functions
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changeset
|
748 Value *access_flags = builder()->CreateValueOfStructEntry( |
1692 | 749 klass, |
4762
069ab3f976d3
7118863: Move sizeof(klassOopDesc) into the *Klass::*_offset_in_bytes() functions
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changeset
|
750 Klass::access_flags_offset(), |
1692 | 751 SharkType::jint_type(), |
752 "access_flags"); | |
753 | |
754 builder()->CreateCondBr( | |
755 builder()->CreateICmpNE( | |
756 builder()->CreateAnd( | |
757 access_flags, | |
758 LLVMValue::jint_constant(JVM_ACC_HAS_FINALIZER)), | |
759 LLVMValue::jint_constant(0)), | |
760 do_call, done); | |
761 | |
762 builder()->SetInsertPoint(do_call); | |
763 call_vm(builder()->register_finalizer(), receiver, EX_CHECK_FULL); | |
764 BasicBlock *branch_block = builder()->GetInsertBlock(); | |
765 builder()->CreateBr(done); | |
766 | |
767 builder()->SetInsertPoint(done); | |
768 current_state()->merge(orig_state, orig_block, branch_block); | |
769 } | |
770 | |
771 void SharkTopLevelBlock::handle_return(BasicType type, Value* exception) { | |
772 assert (exception == NULL || type == T_VOID, "exception OR result, please"); | |
773 | |
774 if (num_monitors()) { | |
775 // Protect our exception across possible monitor release decaches | |
776 if (exception) | |
777 set_oop_tmp(exception); | |
778 | |
779 // We don't need to check for exceptions thrown here. If | |
780 // we're returning a value then we just carry on as normal: | |
781 // the caller will see the pending exception and handle it. | |
782 // If we're returning with an exception then that exception | |
783 // takes priority and the release_lock one will be ignored. | |
784 while (num_monitors()) | |
785 release_lock(EX_CHECK_NONE); | |
786 | |
787 // Reload the exception we're throwing | |
788 if (exception) | |
789 exception = get_oop_tmp(); | |
790 } | |
791 | |
792 if (exception) { | |
793 builder()->CreateStore(exception, pending_exception_address()); | |
794 } | |
795 | |
796 Value *result_addr = stack()->CreatePopFrame(type2size[type]); | |
797 if (type != T_VOID) { | |
798 builder()->CreateStore( | |
799 pop_result(type)->generic_value(), | |
800 builder()->CreateIntToPtr( | |
801 result_addr, | |
802 PointerType::getUnqual(SharkType::to_stackType(type)))); | |
803 } | |
804 | |
805 builder()->CreateRet(LLVMValue::jint_constant(0)); | |
806 } | |
807 | |
808 void SharkTopLevelBlock::do_arraylength() { | |
809 SharkValue *array = pop(); | |
810 check_null(array); | |
811 Value *length = builder()->CreateArrayLength(array->jarray_value()); | |
812 push(SharkValue::create_jint(length, false)); | |
813 } | |
814 | |
815 void SharkTopLevelBlock::do_aload(BasicType basic_type) { | |
816 SharkValue *index = pop(); | |
817 SharkValue *array = pop(); | |
818 | |
819 check_null(array); | |
820 check_bounds(array, index); | |
821 | |
822 Value *value = builder()->CreateLoad( | |
823 builder()->CreateArrayAddress( | |
824 array->jarray_value(), basic_type, index->jint_value())); | |
825 | |
826 const Type *stack_type = SharkType::to_stackType(basic_type); | |
827 if (value->getType() != stack_type) | |
828 value = builder()->CreateIntCast(value, stack_type, basic_type != T_CHAR); | |
829 | |
830 switch (basic_type) { | |
831 case T_BYTE: | |
832 case T_CHAR: | |
833 case T_SHORT: | |
834 case T_INT: | |
835 push(SharkValue::create_jint(value, false)); | |
836 break; | |
837 | |
838 case T_LONG: | |
839 push(SharkValue::create_jlong(value, false)); | |
840 break; | |
841 | |
842 case T_FLOAT: | |
843 push(SharkValue::create_jfloat(value)); | |
844 break; | |
845 | |
846 case T_DOUBLE: | |
847 push(SharkValue::create_jdouble(value)); | |
848 break; | |
849 | |
850 case T_OBJECT: | |
851 // You might expect that array->type()->is_array_klass() would | |
852 // always be true, but it isn't. If ciTypeFlow detects that a | |
853 // value is always null then that value becomes an untyped null | |
854 // object. Shark doesn't presently support this, so a generic | |
855 // T_OBJECT is created. In this case we guess the type using | |
856 // the BasicType we were supplied. In reality the generated | |
857 // code will never be used, as the null value will be caught | |
858 // by the above null pointer check. | |
859 // http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=324 | |
860 push( | |
861 SharkValue::create_generic( | |
862 array->type()->is_array_klass() ? | |
863 ((ciArrayKlass *) array->type())->element_type() : | |
864 ciType::make(basic_type), | |
865 value, false)); | |
866 break; | |
867 | |
868 default: | |
869 tty->print_cr("Unhandled type %s", type2name(basic_type)); | |
870 ShouldNotReachHere(); | |
871 } | |
872 } | |
873 | |
874 void SharkTopLevelBlock::do_astore(BasicType basic_type) { | |
875 SharkValue *svalue = pop(); | |
876 SharkValue *index = pop(); | |
877 SharkValue *array = pop(); | |
878 | |
879 check_null(array); | |
880 check_bounds(array, index); | |
881 | |
882 Value *value; | |
883 switch (basic_type) { | |
884 case T_BYTE: | |
885 case T_CHAR: | |
886 case T_SHORT: | |
887 case T_INT: | |
888 value = svalue->jint_value(); | |
889 break; | |
890 | |
891 case T_LONG: | |
892 value = svalue->jlong_value(); | |
893 break; | |
894 | |
895 case T_FLOAT: | |
896 value = svalue->jfloat_value(); | |
897 break; | |
898 | |
899 case T_DOUBLE: | |
900 value = svalue->jdouble_value(); | |
901 break; | |
902 | |
903 case T_OBJECT: | |
904 value = svalue->jobject_value(); | |
905 // XXX assignability check | |
906 break; | |
907 | |
908 default: | |
909 tty->print_cr("Unhandled type %s", type2name(basic_type)); | |
910 ShouldNotReachHere(); | |
911 } | |
912 | |
913 const Type *array_type = SharkType::to_arrayType(basic_type); | |
914 if (value->getType() != array_type) | |
915 value = builder()->CreateIntCast(value, array_type, basic_type != T_CHAR); | |
916 | |
917 Value *addr = builder()->CreateArrayAddress( | |
918 array->jarray_value(), basic_type, index->jint_value(), "addr"); | |
919 | |
920 builder()->CreateStore(value, addr); | |
921 | |
922 if (basic_type == T_OBJECT) // XXX or T_ARRAY? | |
923 builder()->CreateUpdateBarrierSet(oopDesc::bs(), addr); | |
924 } | |
925 | |
926 void SharkTopLevelBlock::do_return(BasicType type) { | |
927 if (target()->intrinsic_id() == vmIntrinsics::_Object_init) | |
928 call_register_finalizer(local(0)->jobject_value()); | |
929 maybe_add_safepoint(); | |
930 handle_return(type, NULL); | |
931 } | |
932 | |
933 void SharkTopLevelBlock::do_athrow() { | |
934 SharkValue *exception = pop(); | |
935 check_null(exception); | |
936 handle_exception(exception->jobject_value(), EX_CHECK_FULL); | |
937 } | |
938 | |
939 void SharkTopLevelBlock::do_goto() { | |
940 do_branch(ciTypeFlow::GOTO_TARGET); | |
941 } | |
942 | |
943 void SharkTopLevelBlock::do_jsr() { | |
944 push(SharkValue::address_constant(iter()->next_bci())); | |
945 do_branch(ciTypeFlow::GOTO_TARGET); | |
946 } | |
947 | |
948 void SharkTopLevelBlock::do_ret() { | |
949 assert(local(iter()->get_index())->address_value() == | |
950 successor(ciTypeFlow::GOTO_TARGET)->start(), "should be"); | |
951 do_branch(ciTypeFlow::GOTO_TARGET); | |
952 } | |
953 | |
954 // All propagation of state from one block to the next (via | |
955 // dest->add_incoming) is handled by these methods: | |
956 // do_branch | |
957 // do_if_helper | |
958 // do_switch | |
959 // handle_exception | |
960 | |
961 void SharkTopLevelBlock::do_branch(int successor_index) { | |
962 SharkTopLevelBlock *dest = successor(successor_index); | |
963 builder()->CreateBr(dest->entry_block()); | |
964 dest->add_incoming(current_state()); | |
965 } | |
966 | |
967 void SharkTopLevelBlock::do_if(ICmpInst::Predicate p, | |
968 SharkValue* b, | |
969 SharkValue* a) { | |
970 Value *llvm_a, *llvm_b; | |
971 if (a->is_jobject()) { | |
972 llvm_a = a->intptr_value(builder()); | |
973 llvm_b = b->intptr_value(builder()); | |
974 } | |
975 else { | |
976 llvm_a = a->jint_value(); | |
977 llvm_b = b->jint_value(); | |
978 } | |
979 do_if_helper(p, llvm_b, llvm_a, current_state(), current_state()); | |
980 } | |
981 | |
982 void SharkTopLevelBlock::do_if_helper(ICmpInst::Predicate p, | |
983 Value* b, | |
984 Value* a, | |
985 SharkState* if_taken_state, | |
986 SharkState* not_taken_state) { | |
987 SharkTopLevelBlock *if_taken = successor(ciTypeFlow::IF_TAKEN); | |
988 SharkTopLevelBlock *not_taken = successor(ciTypeFlow::IF_NOT_TAKEN); | |
989 | |
990 builder()->CreateCondBr( | |
991 builder()->CreateICmp(p, a, b), | |
992 if_taken->entry_block(), not_taken->entry_block()); | |
993 | |
994 if_taken->add_incoming(if_taken_state); | |
995 not_taken->add_incoming(not_taken_state); | |
996 } | |
997 | |
998 void SharkTopLevelBlock::do_switch() { | |
999 int len = switch_table_length(); | |
1000 | |
1001 SharkTopLevelBlock *dest_block = successor(ciTypeFlow::SWITCH_DEFAULT); | |
1002 SwitchInst *switchinst = builder()->CreateSwitch( | |
1003 pop()->jint_value(), dest_block->entry_block(), len); | |
1004 dest_block->add_incoming(current_state()); | |
1005 | |
1006 for (int i = 0; i < len; i++) { | |
1007 int dest_bci = switch_dest(i); | |
1008 if (dest_bci != switch_default_dest()) { | |
1009 dest_block = bci_successor(dest_bci); | |
1010 switchinst->addCase( | |
1011 LLVMValue::jint_constant(switch_key(i)), | |
1012 dest_block->entry_block()); | |
1013 dest_block->add_incoming(current_state()); | |
1014 } | |
1015 } | |
1016 } | |
1017 | |
1018 ciMethod* SharkTopLevelBlock::improve_virtual_call(ciMethod* caller, | |
1019 ciInstanceKlass* klass, | |
1020 ciMethod* dest_method, | |
1021 ciType* receiver_type) { | |
1022 // If the method is obviously final then we are already done | |
1023 if (dest_method->can_be_statically_bound()) | |
1024 return dest_method; | |
1025 | |
1026 // Array methods are all inherited from Object and are monomorphic | |
1027 if (receiver_type->is_array_klass() && | |
1028 dest_method->holder() == java_lang_Object_klass()) | |
1029 return dest_method; | |
1030 | |
1031 #ifdef SHARK_CAN_DEOPTIMIZE_ANYWHERE | |
1032 // This code can replace a virtual call with a direct call if this | |
1033 // class is the only one in the entire set of loaded classes that | |
1034 // implements this method. This makes the compiled code dependent | |
1035 // on other classes that implement the method not being loaded, a | |
1036 // condition which is enforced by the dependency tracker. If the | |
1037 // dependency tracker determines a method has become invalid it | |
1038 // will mark it for recompilation, causing running copies to be | |
1039 // deoptimized. Shark currently can't deoptimize arbitrarily like | |
1040 // that, so this optimization cannot be used. | |
1041 // http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=481 | |
1042 | |
1043 // All other interesting cases are instance classes | |
1044 if (!receiver_type->is_instance_klass()) | |
1045 return NULL; | |
1046 | |
1047 // Attempt to improve the receiver | |
1048 ciInstanceKlass* actual_receiver = klass; | |
1049 ciInstanceKlass *improved_receiver = receiver_type->as_instance_klass(); | |
1050 if (improved_receiver->is_loaded() && | |
1051 improved_receiver->is_initialized() && | |
1052 !improved_receiver->is_interface() && | |
1053 improved_receiver->is_subtype_of(actual_receiver)) { | |
1054 actual_receiver = improved_receiver; | |
1055 } | |
1056 | |
1057 // Attempt to find a monomorphic target for this call using | |
1058 // class heirachy analysis. | |
1059 ciInstanceKlass *calling_klass = caller->holder(); | |
1060 ciMethod* monomorphic_target = | |
1061 dest_method->find_monomorphic_target(calling_klass, klass, actual_receiver); | |
1062 if (monomorphic_target != NULL) { | |
1063 assert(!monomorphic_target->is_abstract(), "shouldn't be"); | |
1064 | |
1065 // Opto has a bunch of type checking here that I don't | |
1066 // understand. It's to inhibit casting in one direction, | |
1067 // possibly because objects in Opto can have inexact | |
1068 // types, but I can't even tell which direction it | |
1069 // doesn't like. For now I'm going to block *any* cast. | |
1070 if (monomorphic_target != dest_method) { | |
1071 if (SharkPerformanceWarnings) { | |
1072 warning("found monomorphic target, but inhibited cast:"); | |
1073 tty->print(" dest_method = "); | |
1074 dest_method->print_short_name(tty); | |
1075 tty->cr(); | |
1076 tty->print(" monomorphic_target = "); | |
1077 monomorphic_target->print_short_name(tty); | |
1078 tty->cr(); | |
1079 } | |
1080 monomorphic_target = NULL; | |
1081 } | |
1082 } | |
1083 | |
1084 // Replace the virtual call with a direct one. This makes | |
1085 // us dependent on that target method not getting overridden | |
1086 // by dynamic class loading. | |
1087 if (monomorphic_target != NULL) { | |
1088 dependencies()->assert_unique_concrete_method( | |
1089 actual_receiver, monomorphic_target); | |
1090 return monomorphic_target; | |
1091 } | |
1092 | |
1093 // Because Opto distinguishes exact types from inexact ones | |
1094 // it can perform a further optimization to replace calls | |
1095 // with non-monomorphic targets if the receiver has an exact | |
1096 // type. We don't mark types this way, so we can't do this. | |
1097 | |
1098 #endif // SHARK_CAN_DEOPTIMIZE_ANYWHERE | |
1099 | |
1100 return NULL; | |
1101 } | |
1102 | |
1103 Value *SharkTopLevelBlock::get_direct_callee(ciMethod* method) { | |
1104 return builder()->CreateBitCast( | |
1105 builder()->CreateInlineOop(method), | |
1106 SharkType::methodOop_type(), | |
1107 "callee"); | |
1108 } | |
1109 | |
1110 Value *SharkTopLevelBlock::get_virtual_callee(SharkValue* receiver, | |
1111 int vtable_index) { | |
1112 Value *klass = builder()->CreateValueOfStructEntry( | |
1113 receiver->jobject_value(), | |
1114 in_ByteSize(oopDesc::klass_offset_in_bytes()), | |
1115 SharkType::oop_type(), | |
1116 "klass"); | |
1117 | |
1118 return builder()->CreateLoad( | |
1119 builder()->CreateArrayAddress( | |
1120 klass, | |
1121 SharkType::methodOop_type(), | |
1122 vtableEntry::size() * wordSize, | |
1123 in_ByteSize(instanceKlass::vtable_start_offset() * wordSize), | |
1124 LLVMValue::intptr_constant(vtable_index)), | |
1125 "callee"); | |
1126 } | |
1127 | |
1128 Value* SharkTopLevelBlock::get_interface_callee(SharkValue *receiver, | |
1129 ciMethod* method) { | |
1130 BasicBlock *loop = function()->CreateBlock("loop"); | |
1131 BasicBlock *got_null = function()->CreateBlock("got_null"); | |
1132 BasicBlock *not_null = function()->CreateBlock("not_null"); | |
1133 BasicBlock *next = function()->CreateBlock("next"); | |
1134 BasicBlock *got_entry = function()->CreateBlock("got_entry"); | |
1135 | |
1136 // Locate the receiver's itable | |
1137 Value *object_klass = builder()->CreateValueOfStructEntry( | |
1138 receiver->jobject_value(), in_ByteSize(oopDesc::klass_offset_in_bytes()), | |
1139 SharkType::oop_type(), | |
1140 "object_klass"); | |
1141 | |
1142 Value *vtable_start = builder()->CreateAdd( | |
1143 builder()->CreatePtrToInt(object_klass, SharkType::intptr_type()), | |
1144 LLVMValue::intptr_constant( | |
1145 instanceKlass::vtable_start_offset() * HeapWordSize), | |
1146 "vtable_start"); | |
1147 | |
1148 Value *vtable_length = builder()->CreateValueOfStructEntry( | |
1149 object_klass, | |
1150 in_ByteSize(instanceKlass::vtable_length_offset() * HeapWordSize), | |
1151 SharkType::jint_type(), | |
1152 "vtable_length"); | |
1153 vtable_length = | |
1154 builder()->CreateIntCast(vtable_length, SharkType::intptr_type(), false); | |
1155 | |
1156 bool needs_aligning = HeapWordsPerLong > 1; | |
1157 Value *itable_start = builder()->CreateAdd( | |
1158 vtable_start, | |
1159 builder()->CreateShl( | |
1160 vtable_length, | |
1161 LLVMValue::intptr_constant(exact_log2(vtableEntry::size() * wordSize))), | |
1162 needs_aligning ? "" : "itable_start"); | |
1163 if (needs_aligning) { | |
1164 itable_start = builder()->CreateAnd( | |
1165 builder()->CreateAdd( | |
1166 itable_start, LLVMValue::intptr_constant(BytesPerLong - 1)), | |
1167 LLVMValue::intptr_constant(~(BytesPerLong - 1)), | |
1168 "itable_start"); | |
1169 } | |
1170 | |
1171 // Locate this interface's entry in the table | |
1172 Value *iklass = builder()->CreateInlineOop(method->holder()); | |
1173 BasicBlock *loop_entry = builder()->GetInsertBlock(); | |
1174 builder()->CreateBr(loop); | |
1175 builder()->SetInsertPoint(loop); | |
1176 PHINode *itable_entry_addr = builder()->CreatePHI( | |
1177 SharkType::intptr_type(), "itable_entry_addr"); | |
1178 itable_entry_addr->addIncoming(itable_start, loop_entry); | |
1179 | |
1180 Value *itable_entry = builder()->CreateIntToPtr( | |
1181 itable_entry_addr, SharkType::itableOffsetEntry_type(), "itable_entry"); | |
1182 | |
1183 Value *itable_iklass = builder()->CreateValueOfStructEntry( | |
1184 itable_entry, | |
1185 in_ByteSize(itableOffsetEntry::interface_offset_in_bytes()), | |
1186 SharkType::oop_type(), | |
1187 "itable_iklass"); | |
1188 | |
1189 builder()->CreateCondBr( | |
1190 builder()->CreateICmpEQ(itable_iklass, LLVMValue::null()), | |
1191 got_null, not_null); | |
1192 | |
1193 // A null entry means that the class doesn't implement the | |
1194 // interface, and wasn't the same as the class checked when | |
1195 // the interface was resolved. | |
1196 builder()->SetInsertPoint(got_null); | |
1197 builder()->CreateUnimplemented(__FILE__, __LINE__); | |
1198 builder()->CreateUnreachable(); | |
1199 | |
1200 builder()->SetInsertPoint(not_null); | |
1201 builder()->CreateCondBr( | |
1202 builder()->CreateICmpEQ(itable_iklass, iklass), | |
1203 got_entry, next); | |
1204 | |
1205 builder()->SetInsertPoint(next); | |
1206 Value *next_entry = builder()->CreateAdd( | |
1207 itable_entry_addr, | |
1208 LLVMValue::intptr_constant(itableOffsetEntry::size() * wordSize)); | |
1209 builder()->CreateBr(loop); | |
1210 itable_entry_addr->addIncoming(next_entry, next); | |
1211 | |
1212 // Locate the method pointer | |
1213 builder()->SetInsertPoint(got_entry); | |
1214 Value *offset = builder()->CreateValueOfStructEntry( | |
1215 itable_entry, | |
1216 in_ByteSize(itableOffsetEntry::offset_offset_in_bytes()), | |
1217 SharkType::jint_type(), | |
1218 "offset"); | |
1219 offset = | |
1220 builder()->CreateIntCast(offset, SharkType::intptr_type(), false); | |
1221 | |
1222 return builder()->CreateLoad( | |
1223 builder()->CreateIntToPtr( | |
1224 builder()->CreateAdd( | |
1225 builder()->CreateAdd( | |
1226 builder()->CreateAdd( | |
1227 builder()->CreatePtrToInt( | |
1228 object_klass, SharkType::intptr_type()), | |
1229 offset), | |
1230 LLVMValue::intptr_constant( | |
1231 method->itable_index() * itableMethodEntry::size() * wordSize)), | |
1232 LLVMValue::intptr_constant( | |
1233 itableMethodEntry::method_offset_in_bytes())), | |
1234 PointerType::getUnqual(SharkType::methodOop_type())), | |
1235 "callee"); | |
1236 } | |
1237 | |
1238 void SharkTopLevelBlock::do_call() { | |
1239 // Set frequently used booleans | |
1240 bool is_static = bc() == Bytecodes::_invokestatic; | |
1241 bool is_virtual = bc() == Bytecodes::_invokevirtual; | |
1242 bool is_interface = bc() == Bytecodes::_invokeinterface; | |
1243 | |
1244 // Find the method being called | |
1245 bool will_link; | |
1246 ciMethod *dest_method = iter()->get_method(will_link); | |
1247 assert(will_link, "typeflow responsibility"); | |
1248 assert(dest_method->is_static() == is_static, "must match bc"); | |
1249 | |
1250 // Find the class of the method being called. Note | |
1251 // that the superclass check in the second assertion | |
1252 // is to cope with a hole in the spec that allows for | |
1253 // invokeinterface instructions where the resolved | |
1254 // method is a virtual method in java.lang.Object. | |
1255 // javac doesn't generate code like that, but there's | |
1256 // no reason a compliant Java compiler might not. | |
1257 ciInstanceKlass *holder_klass = dest_method->holder(); | |
1258 assert(holder_klass->is_loaded(), "scan_for_traps responsibility"); | |
1259 assert(holder_klass->is_interface() || | |
1260 holder_klass->super() == NULL || | |
1261 !is_interface, "must match bc"); | |
1262 ciKlass *holder = iter()->get_declared_method_holder(); | |
1263 ciInstanceKlass *klass = | |
1264 ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
1265 | |
1266 // Find the receiver in the stack. We do this before | |
1267 // trying to inline because the inliner can only use | |
1268 // zero-checked values, not being able to perform the | |
1269 // check itself. | |
1270 SharkValue *receiver = NULL; | |
1271 if (!is_static) { | |
1272 receiver = xstack(dest_method->arg_size() - 1); | |
1273 check_null(receiver); | |
1274 } | |
1275 | |
1276 // Try to improve non-direct calls | |
1277 bool call_is_virtual = is_virtual || is_interface; | |
1278 ciMethod *call_method = dest_method; | |
1279 if (call_is_virtual) { | |
1280 ciMethod *optimized_method = improve_virtual_call( | |
1281 target(), klass, dest_method, receiver->type()); | |
1282 if (optimized_method) { | |
1283 call_method = optimized_method; | |
1284 call_is_virtual = false; | |
1285 } | |
1286 } | |
1287 | |
1288 // Try to inline the call | |
1289 if (!call_is_virtual) { | |
1290 if (SharkInliner::attempt_inline(call_method, current_state())) | |
1291 return; | |
1292 } | |
1293 | |
1294 // Find the method we are calling | |
1295 Value *callee; | |
1296 if (call_is_virtual) { | |
1297 if (is_virtual) { | |
1298 assert(klass->is_linked(), "scan_for_traps responsibility"); | |
1299 int vtable_index = call_method->resolve_vtable_index( | |
1300 target()->holder(), klass); | |
1301 assert(vtable_index >= 0, "should be"); | |
1302 callee = get_virtual_callee(receiver, vtable_index); | |
1303 } | |
1304 else { | |
1305 assert(is_interface, "should be"); | |
1306 callee = get_interface_callee(receiver, call_method); | |
1307 } | |
1308 } | |
1309 else { | |
1310 callee = get_direct_callee(call_method); | |
1311 } | |
1312 | |
1313 // Load the SharkEntry from the callee | |
1314 Value *base_pc = builder()->CreateValueOfStructEntry( | |
1315 callee, methodOopDesc::from_interpreted_offset(), | |
1316 SharkType::intptr_type(), | |
1317 "base_pc"); | |
1318 | |
1319 // Load the entry point from the SharkEntry | |
1320 Value *entry_point = builder()->CreateLoad( | |
1321 builder()->CreateIntToPtr( | |
1322 builder()->CreateAdd( | |
1323 base_pc, | |
1324 LLVMValue::intptr_constant(in_bytes(ZeroEntry::entry_point_offset()))), | |
1325 PointerType::getUnqual( | |
1326 PointerType::getUnqual(SharkType::entry_point_type()))), | |
1327 "entry_point"); | |
1328 | |
1329 // Make the call | |
1330 decache_for_Java_call(call_method); | |
1331 Value *deoptimized_frames = builder()->CreateCall3( | |
1332 entry_point, callee, base_pc, thread()); | |
1333 | |
1334 // If the callee got deoptimized then reexecute in the interpreter | |
1335 BasicBlock *reexecute = function()->CreateBlock("reexecute"); | |
1336 BasicBlock *call_completed = function()->CreateBlock("call_completed"); | |
1337 builder()->CreateCondBr( | |
1338 builder()->CreateICmpNE(deoptimized_frames, LLVMValue::jint_constant(0)), | |
1339 reexecute, call_completed); | |
1340 | |
1341 builder()->SetInsertPoint(reexecute); | |
1342 builder()->CreateCall2( | |
1343 builder()->deoptimized_entry_point(), | |
1344 builder()->CreateSub(deoptimized_frames, LLVMValue::jint_constant(1)), | |
1345 thread()); | |
1346 builder()->CreateBr(call_completed); | |
1347 | |
1348 // Cache after the call | |
1349 builder()->SetInsertPoint(call_completed); | |
1350 cache_after_Java_call(call_method); | |
1351 | |
1352 // Check for pending exceptions | |
1353 check_pending_exception(EX_CHECK_FULL); | |
1354 | |
1355 // Mark that a safepoint check has occurred | |
1356 current_state()->set_has_safepointed(true); | |
1357 } | |
1358 | |
1359 bool SharkTopLevelBlock::static_subtype_check(ciKlass* check_klass, | |
1360 ciKlass* object_klass) { | |
1361 // If the class we're checking against is java.lang.Object | |
1362 // then this is a no brainer. Apparently this can happen | |
1363 // in reflective code... | |
1364 if (check_klass == java_lang_Object_klass()) | |
1365 return true; | |
1366 | |
1367 // Perform a subtype check. NB in opto's code for this | |
1368 // (GraphKit::static_subtype_check) it says that static | |
1369 // interface types cannot be trusted, and if opto can't | |
1370 // trust them then I assume we can't either. | |
1371 if (object_klass->is_loaded() && !object_klass->is_interface()) { | |
1372 if (object_klass == check_klass) | |
1373 return true; | |
1374 | |
1375 if (check_klass->is_loaded() && object_klass->is_subtype_of(check_klass)) | |
1376 return true; | |
1377 } | |
1378 | |
1379 return false; | |
1380 } | |
1381 | |
1382 void SharkTopLevelBlock::do_instance_check() { | |
1383 // Get the class we're checking against | |
1384 bool will_link; | |
1385 ciKlass *check_klass = iter()->get_klass(will_link); | |
1386 | |
1387 // Get the class of the object we're checking | |
1388 ciKlass *object_klass = xstack(0)->type()->as_klass(); | |
1389 | |
1390 // Can we optimize this check away? | |
1391 if (static_subtype_check(check_klass, object_klass)) { | |
1392 if (bc() == Bytecodes::_instanceof) { | |
1393 pop(); | |
1394 push(SharkValue::jint_constant(1)); | |
1395 } | |
1396 return; | |
1397 } | |
1398 | |
1399 // Need to check this one at runtime | |
1400 if (will_link) | |
1401 do_full_instance_check(check_klass); | |
1402 else | |
1403 do_trapping_instance_check(check_klass); | |
1404 } | |
1405 | |
1406 bool SharkTopLevelBlock::maybe_do_instanceof_if() { | |
1407 // Get the class we're checking against | |
1408 bool will_link; | |
1409 ciKlass *check_klass = iter()->get_klass(will_link); | |
1410 | |
1411 // If the class is unloaded then the instanceof | |
1412 // cannot possibly succeed. | |
1413 if (!will_link) | |
1414 return false; | |
1415 | |
1416 // Keep a copy of the object we're checking | |
1417 SharkValue *old_object = xstack(0); | |
1418 | |
1419 // Get the class of the object we're checking | |
1420 ciKlass *object_klass = old_object->type()->as_klass(); | |
1421 | |
1422 // If the instanceof can be optimized away at compile time | |
1423 // then any subsequent checkcasts will be too so we handle | |
1424 // it normally. | |
1425 if (static_subtype_check(check_klass, object_klass)) | |
1426 return false; | |
1427 | |
1428 // Perform the instance check | |
1429 do_full_instance_check(check_klass); | |
1430 Value *result = pop()->jint_value(); | |
1431 | |
1432 // Create the casted object | |
1433 SharkValue *new_object = SharkValue::create_generic( | |
1434 check_klass, old_object->jobject_value(), old_object->zero_checked()); | |
1435 | |
1436 // Create two copies of the current state, one with the | |
1437 // original object and one with all instances of the | |
1438 // original object replaced with the new, casted object. | |
1439 SharkState *new_state = current_state(); | |
1440 SharkState *old_state = new_state->copy(); | |
1441 new_state->replace_all(old_object, new_object); | |
1442 | |
1443 // Perform the check-and-branch | |
1444 switch (iter()->next_bc()) { | |
1445 case Bytecodes::_ifeq: | |
1446 // branch if not an instance | |
1447 do_if_helper( | |
1448 ICmpInst::ICMP_EQ, | |
1449 LLVMValue::jint_constant(0), result, | |
1450 old_state, new_state); | |
1451 break; | |
1452 | |
1453 case Bytecodes::_ifne: | |
1454 // branch if an instance | |
1455 do_if_helper( | |
1456 ICmpInst::ICMP_NE, | |
1457 LLVMValue::jint_constant(0), result, | |
1458 new_state, old_state); | |
1459 break; | |
1460 | |
1461 default: | |
1462 ShouldNotReachHere(); | |
1463 } | |
1464 | |
1465 return true; | |
1466 } | |
1467 | |
1468 void SharkTopLevelBlock::do_full_instance_check(ciKlass* klass) { | |
1469 BasicBlock *not_null = function()->CreateBlock("not_null"); | |
1470 BasicBlock *subtype_check = function()->CreateBlock("subtype_check"); | |
1471 BasicBlock *is_instance = function()->CreateBlock("is_instance"); | |
1472 BasicBlock *not_instance = function()->CreateBlock("not_instance"); | |
1473 BasicBlock *merge1 = function()->CreateBlock("merge1"); | |
1474 BasicBlock *merge2 = function()->CreateBlock("merge2"); | |
1475 | |
1476 enum InstanceCheckStates { | |
1477 IC_IS_NULL, | |
1478 IC_IS_INSTANCE, | |
1479 IC_NOT_INSTANCE, | |
1480 }; | |
1481 | |
1482 // Pop the object off the stack | |
1483 Value *object = pop()->jobject_value(); | |
1484 | |
1485 // Null objects aren't instances of anything | |
1486 builder()->CreateCondBr( | |
1487 builder()->CreateICmpEQ(object, LLVMValue::null()), | |
1488 merge2, not_null); | |
1489 BasicBlock *null_block = builder()->GetInsertBlock(); | |
1490 | |
1491 // Get the class we're checking against | |
1492 builder()->SetInsertPoint(not_null); | |
1493 Value *check_klass = builder()->CreateInlineOop(klass); | |
1494 | |
1495 // Get the class of the object being tested | |
1496 Value *object_klass = builder()->CreateValueOfStructEntry( | |
1497 object, in_ByteSize(oopDesc::klass_offset_in_bytes()), | |
1498 SharkType::oop_type(), | |
1499 "object_klass"); | |
1500 | |
1501 // Perform the check | |
1502 builder()->CreateCondBr( | |
1503 builder()->CreateICmpEQ(check_klass, object_klass), | |
1504 is_instance, subtype_check); | |
1505 | |
1506 builder()->SetInsertPoint(subtype_check); | |
1507 builder()->CreateCondBr( | |
1508 builder()->CreateICmpNE( | |
1509 builder()->CreateCall2( | |
1510 builder()->is_subtype_of(), check_klass, object_klass), | |
1511 LLVMValue::jbyte_constant(0)), | |
1512 is_instance, not_instance); | |
1513 | |
1514 builder()->SetInsertPoint(is_instance); | |
1515 builder()->CreateBr(merge1); | |
1516 | |
1517 builder()->SetInsertPoint(not_instance); | |
1518 builder()->CreateBr(merge1); | |
1519 | |
1520 // First merge | |
1521 builder()->SetInsertPoint(merge1); | |
1522 PHINode *nonnull_result = builder()->CreatePHI( | |
1523 SharkType::jint_type(), "nonnull_result"); | |
1524 nonnull_result->addIncoming( | |
1525 LLVMValue::jint_constant(IC_IS_INSTANCE), is_instance); | |
1526 nonnull_result->addIncoming( | |
1527 LLVMValue::jint_constant(IC_NOT_INSTANCE), not_instance); | |
1528 BasicBlock *nonnull_block = builder()->GetInsertBlock(); | |
1529 builder()->CreateBr(merge2); | |
1530 | |
1531 // Second merge | |
1532 builder()->SetInsertPoint(merge2); | |
1533 PHINode *result = builder()->CreatePHI( | |
1534 SharkType::jint_type(), "result"); | |
1535 result->addIncoming(LLVMValue::jint_constant(IC_IS_NULL), null_block); | |
1536 result->addIncoming(nonnull_result, nonnull_block); | |
1537 | |
1538 // Handle the result | |
1539 if (bc() == Bytecodes::_checkcast) { | |
1540 BasicBlock *failure = function()->CreateBlock("failure"); | |
1541 BasicBlock *success = function()->CreateBlock("success"); | |
1542 | |
1543 builder()->CreateCondBr( | |
1544 builder()->CreateICmpNE( | |
1545 result, LLVMValue::jint_constant(IC_NOT_INSTANCE)), | |
1546 success, failure); | |
1547 | |
1548 builder()->SetInsertPoint(failure); | |
1549 SharkState *saved_state = current_state()->copy(); | |
1550 | |
1551 call_vm( | |
1552 builder()->throw_ClassCastException(), | |
1553 builder()->CreateIntToPtr( | |
1554 LLVMValue::intptr_constant((intptr_t) __FILE__), | |
1555 PointerType::getUnqual(SharkType::jbyte_type())), | |
1556 LLVMValue::jint_constant(__LINE__), | |
1557 EX_CHECK_NONE); | |
1558 | |
1559 Value *pending_exception = get_pending_exception(); | |
1560 clear_pending_exception(); | |
1561 handle_exception(pending_exception, EX_CHECK_FULL); | |
1562 | |
1563 set_current_state(saved_state); | |
1564 builder()->SetInsertPoint(success); | |
1565 push(SharkValue::create_generic(klass, object, false)); | |
1566 } | |
1567 else { | |
1568 push( | |
1569 SharkValue::create_jint( | |
1570 builder()->CreateIntCast( | |
1571 builder()->CreateICmpEQ( | |
1572 result, LLVMValue::jint_constant(IC_IS_INSTANCE)), | |
1573 SharkType::jint_type(), false), false)); | |
1574 } | |
1575 } | |
1576 | |
1577 void SharkTopLevelBlock::do_trapping_instance_check(ciKlass* klass) { | |
1578 BasicBlock *not_null = function()->CreateBlock("not_null"); | |
1579 BasicBlock *is_null = function()->CreateBlock("null"); | |
1580 | |
1581 // Leave the object on the stack so it's there if we trap | |
1582 builder()->CreateCondBr( | |
1583 builder()->CreateICmpEQ(xstack(0)->jobject_value(), LLVMValue::null()), | |
1584 is_null, not_null); | |
1585 SharkState *saved_state = current_state()->copy(); | |
1586 | |
1587 // If it's not null then we need to trap | |
1588 builder()->SetInsertPoint(not_null); | |
1589 set_current_state(saved_state->copy()); | |
1590 do_trap( | |
1591 Deoptimization::make_trap_request( | |
1592 Deoptimization::Reason_uninitialized, | |
1593 Deoptimization::Action_reinterpret)); | |
1594 | |
1595 // If it's null then we're ok | |
1596 builder()->SetInsertPoint(is_null); | |
1597 set_current_state(saved_state); | |
1598 if (bc() == Bytecodes::_checkcast) { | |
1599 push(SharkValue::create_generic(klass, pop()->jobject_value(), false)); | |
1600 } | |
1601 else { | |
1602 pop(); | |
1603 push(SharkValue::jint_constant(0)); | |
1604 } | |
1605 } | |
1606 | |
1607 void SharkTopLevelBlock::do_new() { | |
1608 bool will_link; | |
1609 ciInstanceKlass* klass = iter()->get_klass(will_link)->as_instance_klass(); | |
1610 assert(will_link, "typeflow responsibility"); | |
1611 | |
1612 BasicBlock *got_tlab = NULL; | |
1613 BasicBlock *heap_alloc = NULL; | |
1614 BasicBlock *retry = NULL; | |
1615 BasicBlock *got_heap = NULL; | |
1616 BasicBlock *initialize = NULL; | |
1617 BasicBlock *got_fast = NULL; | |
1618 BasicBlock *slow_alloc_and_init = NULL; | |
1619 BasicBlock *got_slow = NULL; | |
1620 BasicBlock *push_object = NULL; | |
1621 | |
1622 SharkState *fast_state = NULL; | |
1623 | |
1624 Value *tlab_object = NULL; | |
1625 Value *heap_object = NULL; | |
1626 Value *fast_object = NULL; | |
1627 Value *slow_object = NULL; | |
1628 Value *object = NULL; | |
1629 | |
1630 // The fast path | |
1631 if (!Klass::layout_helper_needs_slow_path(klass->layout_helper())) { | |
1632 if (UseTLAB) { | |
1633 got_tlab = function()->CreateBlock("got_tlab"); | |
1634 heap_alloc = function()->CreateBlock("heap_alloc"); | |
1635 } | |
1636 retry = function()->CreateBlock("retry"); | |
1637 got_heap = function()->CreateBlock("got_heap"); | |
1638 initialize = function()->CreateBlock("initialize"); | |
1639 slow_alloc_and_init = function()->CreateBlock("slow_alloc_and_init"); | |
1640 push_object = function()->CreateBlock("push_object"); | |
1641 | |
1642 size_t size_in_bytes = klass->size_helper() << LogHeapWordSize; | |
1643 | |
1644 // Thread local allocation | |
1645 if (UseTLAB) { | |
1646 Value *top_addr = builder()->CreateAddressOfStructEntry( | |
1647 thread(), Thread::tlab_top_offset(), | |
1648 PointerType::getUnqual(SharkType::intptr_type()), | |
1649 "top_addr"); | |
1650 | |
1651 Value *end = builder()->CreateValueOfStructEntry( | |
1652 thread(), Thread::tlab_end_offset(), | |
1653 SharkType::intptr_type(), | |
1654 "end"); | |
1655 | |
1656 Value *old_top = builder()->CreateLoad(top_addr, "old_top"); | |
1657 Value *new_top = builder()->CreateAdd( | |
1658 old_top, LLVMValue::intptr_constant(size_in_bytes)); | |
1659 | |
1660 builder()->CreateCondBr( | |
1661 builder()->CreateICmpULE(new_top, end), | |
1662 got_tlab, heap_alloc); | |
1663 | |
1664 builder()->SetInsertPoint(got_tlab); | |
1665 tlab_object = builder()->CreateIntToPtr( | |
1666 old_top, SharkType::oop_type(), "tlab_object"); | |
1667 | |
1668 builder()->CreateStore(new_top, top_addr); | |
1669 builder()->CreateBr(initialize); | |
1670 | |
1671 builder()->SetInsertPoint(heap_alloc); | |
1672 } | |
1673 | |
1674 // Heap allocation | |
1675 Value *top_addr = builder()->CreateIntToPtr( | |
1676 LLVMValue::intptr_constant((intptr_t) Universe::heap()->top_addr()), | |
1677 PointerType::getUnqual(SharkType::intptr_type()), | |
1678 "top_addr"); | |
1679 | |
1680 Value *end = builder()->CreateLoad( | |
1681 builder()->CreateIntToPtr( | |
1682 LLVMValue::intptr_constant((intptr_t) Universe::heap()->end_addr()), | |
1683 PointerType::getUnqual(SharkType::intptr_type())), | |
1684 "end"); | |
1685 | |
1686 builder()->CreateBr(retry); | |
1687 builder()->SetInsertPoint(retry); | |
1688 | |
1689 Value *old_top = builder()->CreateLoad(top_addr, "top"); | |
1690 Value *new_top = builder()->CreateAdd( | |
1691 old_top, LLVMValue::intptr_constant(size_in_bytes)); | |
1692 | |
1693 builder()->CreateCondBr( | |
1694 builder()->CreateICmpULE(new_top, end), | |
1695 got_heap, slow_alloc_and_init); | |
1696 | |
1697 builder()->SetInsertPoint(got_heap); | |
1698 heap_object = builder()->CreateIntToPtr( | |
1699 old_top, SharkType::oop_type(), "heap_object"); | |
1700 | |
1701 Value *check = builder()->CreateCmpxchgPtr(new_top, top_addr, old_top); | |
1702 builder()->CreateCondBr( | |
1703 builder()->CreateICmpEQ(old_top, check), | |
1704 initialize, retry); | |
1705 | |
1706 // Initialize the object | |
1707 builder()->SetInsertPoint(initialize); | |
1708 if (tlab_object) { | |
1709 PHINode *phi = builder()->CreatePHI( | |
1710 SharkType::oop_type(), "fast_object"); | |
1711 phi->addIncoming(tlab_object, got_tlab); | |
1712 phi->addIncoming(heap_object, got_heap); | |
1713 fast_object = phi; | |
1714 } | |
1715 else { | |
1716 fast_object = heap_object; | |
1717 } | |
1718 | |
1719 builder()->CreateMemset( | |
1720 builder()->CreateBitCast( | |
1721 fast_object, PointerType::getUnqual(SharkType::jbyte_type())), | |
1722 LLVMValue::jbyte_constant(0), | |
1723 LLVMValue::jint_constant(size_in_bytes), | |
1724 LLVMValue::jint_constant(HeapWordSize)); | |
1725 | |
1726 Value *mark_addr = builder()->CreateAddressOfStructEntry( | |
1727 fast_object, in_ByteSize(oopDesc::mark_offset_in_bytes()), | |
1728 PointerType::getUnqual(SharkType::intptr_type()), | |
1729 "mark_addr"); | |
1730 | |
1731 Value *klass_addr = builder()->CreateAddressOfStructEntry( | |
1732 fast_object, in_ByteSize(oopDesc::klass_offset_in_bytes()), | |
1733 PointerType::getUnqual(SharkType::oop_type()), | |
1734 "klass_addr"); | |
1735 | |
1736 // Set the mark | |
1737 intptr_t mark; | |
1738 if (UseBiasedLocking) { | |
1739 Unimplemented(); | |
1740 } | |
1741 else { | |
1742 mark = (intptr_t) markOopDesc::prototype(); | |
1743 } | |
1744 builder()->CreateStore(LLVMValue::intptr_constant(mark), mark_addr); | |
1745 | |
1746 // Set the class | |
1747 Value *rtklass = builder()->CreateInlineOop(klass); | |
1748 builder()->CreateStore(rtklass, klass_addr); | |
1749 got_fast = builder()->GetInsertBlock(); | |
1750 | |
1751 builder()->CreateBr(push_object); | |
1752 builder()->SetInsertPoint(slow_alloc_and_init); | |
1753 fast_state = current_state()->copy(); | |
1754 } | |
1755 | |
1756 // The slow path | |
1757 call_vm( | |
1758 builder()->new_instance(), | |
1759 LLVMValue::jint_constant(iter()->get_klass_index()), | |
1760 EX_CHECK_FULL); | |
1761 slow_object = get_vm_result(); | |
1762 got_slow = builder()->GetInsertBlock(); | |
1763 | |
1764 // Push the object | |
1765 if (push_object) { | |
1766 builder()->CreateBr(push_object); | |
1767 builder()->SetInsertPoint(push_object); | |
1768 } | |
1769 if (fast_object) { | |
1770 PHINode *phi = builder()->CreatePHI(SharkType::oop_type(), "object"); | |
1771 phi->addIncoming(fast_object, got_fast); | |
1772 phi->addIncoming(slow_object, got_slow); | |
1773 object = phi; | |
1774 current_state()->merge(fast_state, got_fast, got_slow); | |
1775 } | |
1776 else { | |
1777 object = slow_object; | |
1778 } | |
1779 | |
1780 push(SharkValue::create_jobject(object, true)); | |
1781 } | |
1782 | |
1783 void SharkTopLevelBlock::do_newarray() { | |
1784 BasicType type = (BasicType) iter()->get_index(); | |
1785 | |
1786 call_vm( | |
1787 builder()->newarray(), | |
1788 LLVMValue::jint_constant(type), | |
1789 pop()->jint_value(), | |
1790 EX_CHECK_FULL); | |
1791 | |
1792 ciArrayKlass *array_klass = ciArrayKlass::make(ciType::make(type)); | |
1793 push(SharkValue::create_generic(array_klass, get_vm_result(), true)); | |
1794 } | |
1795 | |
1796 void SharkTopLevelBlock::do_anewarray() { | |
1797 bool will_link; | |
1798 ciKlass *klass = iter()->get_klass(will_link); | |
1799 assert(will_link, "typeflow responsibility"); | |
1800 | |
1801 ciObjArrayKlass *array_klass = ciObjArrayKlass::make(klass); | |
1802 if (!array_klass->is_loaded()) { | |
1803 Unimplemented(); | |
1804 } | |
1805 | |
1806 call_vm( | |
1807 builder()->anewarray(), | |
1808 LLVMValue::jint_constant(iter()->get_klass_index()), | |
1809 pop()->jint_value(), | |
1810 EX_CHECK_FULL); | |
1811 | |
1812 push(SharkValue::create_generic(array_klass, get_vm_result(), true)); | |
1813 } | |
1814 | |
1815 void SharkTopLevelBlock::do_multianewarray() { | |
1816 bool will_link; | |
1817 ciArrayKlass *array_klass = iter()->get_klass(will_link)->as_array_klass(); | |
1818 assert(will_link, "typeflow responsibility"); | |
1819 | |
1820 // The dimensions are stack values, so we use their slots for the | |
1821 // dimensions array. Note that we are storing them in the reverse | |
1822 // of normal stack order. | |
1823 int ndims = iter()->get_dimensions(); | |
1824 | |
1825 Value *dimensions = stack()->slot_addr( | |
1826 stack()->stack_slots_offset() + max_stack() - xstack_depth(), | |
1827 ArrayType::get(SharkType::jint_type(), ndims), | |
1828 "dimensions"); | |
1829 | |
1830 for (int i = 0; i < ndims; i++) { | |
1831 builder()->CreateStore( | |
1832 xstack(ndims - 1 - i)->jint_value(), | |
1833 builder()->CreateStructGEP(dimensions, i)); | |
1834 } | |
1835 | |
1836 call_vm( | |
1837 builder()->multianewarray(), | |
1838 LLVMValue::jint_constant(iter()->get_klass_index()), | |
1839 LLVMValue::jint_constant(ndims), | |
1840 builder()->CreateStructGEP(dimensions, 0), | |
1841 EX_CHECK_FULL); | |
1842 | |
1843 // Now we can pop the dimensions off the stack | |
1844 for (int i = 0; i < ndims; i++) | |
1845 pop(); | |
1846 | |
1847 push(SharkValue::create_generic(array_klass, get_vm_result(), true)); | |
1848 } | |
1849 | |
1850 void SharkTopLevelBlock::acquire_method_lock() { | |
1851 Value *lockee; | |
1852 if (target()->is_static()) | |
1853 lockee = builder()->CreateInlineOop(target()->holder()->java_mirror()); | |
1854 else | |
1855 lockee = local(0)->jobject_value(); | |
1856 | |
1857 iter()->force_bci(start()); // for the decache in acquire_lock | |
1858 acquire_lock(lockee, EX_CHECK_NO_CATCH); | |
1859 } | |
1860 | |
1861 void SharkTopLevelBlock::do_monitorenter() { | |
1862 SharkValue *lockee = pop(); | |
1863 check_null(lockee); | |
1864 acquire_lock(lockee->jobject_value(), EX_CHECK_FULL); | |
1865 } | |
1866 | |
1867 void SharkTopLevelBlock::do_monitorexit() { | |
1868 pop(); // don't need this (monitors are block structured) | |
1869 release_lock(EX_CHECK_NO_CATCH); | |
1870 } | |
1871 | |
1872 void SharkTopLevelBlock::acquire_lock(Value *lockee, int exception_action) { | |
1873 BasicBlock *try_recursive = function()->CreateBlock("try_recursive"); | |
1874 BasicBlock *got_recursive = function()->CreateBlock("got_recursive"); | |
1875 BasicBlock *not_recursive = function()->CreateBlock("not_recursive"); | |
1876 BasicBlock *acquired_fast = function()->CreateBlock("acquired_fast"); | |
1877 BasicBlock *lock_acquired = function()->CreateBlock("lock_acquired"); | |
1878 | |
1879 int monitor = num_monitors(); | |
1880 Value *monitor_addr = stack()->monitor_addr(monitor); | |
1881 Value *monitor_object_addr = stack()->monitor_object_addr(monitor); | |
1882 Value *monitor_header_addr = stack()->monitor_header_addr(monitor); | |
1883 | |
1884 // Store the object and mark the slot as live | |
1885 builder()->CreateStore(lockee, monitor_object_addr); | |
1886 set_num_monitors(monitor + 1); | |
1887 | |
1888 // Try a simple lock | |
1889 Value *mark_addr = builder()->CreateAddressOfStructEntry( | |
1890 lockee, in_ByteSize(oopDesc::mark_offset_in_bytes()), | |
1891 PointerType::getUnqual(SharkType::intptr_type()), | |
1892 "mark_addr"); | |
1893 | |
1894 Value *mark = builder()->CreateLoad(mark_addr, "mark"); | |
1895 Value *disp = builder()->CreateOr( | |
1896 mark, LLVMValue::intptr_constant(markOopDesc::unlocked_value), "disp"); | |
1897 builder()->CreateStore(disp, monitor_header_addr); | |
1898 | |
1899 Value *lock = builder()->CreatePtrToInt( | |
1900 monitor_header_addr, SharkType::intptr_type()); | |
1901 Value *check = builder()->CreateCmpxchgPtr(lock, mark_addr, disp); | |
1902 builder()->CreateCondBr( | |
1903 builder()->CreateICmpEQ(disp, check), | |
1904 acquired_fast, try_recursive); | |
1905 | |
1906 // Locking failed, but maybe this thread already owns it | |
1907 builder()->SetInsertPoint(try_recursive); | |
1908 Value *addr = builder()->CreateAnd( | |
1909 disp, | |
1910 LLVMValue::intptr_constant(~markOopDesc::lock_mask_in_place)); | |
1911 | |
1912 // NB we use the entire stack, but JavaThread::is_lock_owned() | |
1913 // uses a more limited range. I don't think it hurts though... | |
1914 Value *stack_limit = builder()->CreateValueOfStructEntry( | |
1915 thread(), Thread::stack_base_offset(), | |
1916 SharkType::intptr_type(), | |
1917 "stack_limit"); | |
1918 | |
1919 assert(sizeof(size_t) == sizeof(intptr_t), "should be"); | |
1920 Value *stack_size = builder()->CreateValueOfStructEntry( | |
1921 thread(), Thread::stack_size_offset(), | |
1922 SharkType::intptr_type(), | |
1923 "stack_size"); | |
1924 | |
1925 Value *stack_start = | |
1926 builder()->CreateSub(stack_limit, stack_size, "stack_start"); | |
1927 | |
1928 builder()->CreateCondBr( | |
1929 builder()->CreateAnd( | |
1930 builder()->CreateICmpUGE(addr, stack_start), | |
1931 builder()->CreateICmpULT(addr, stack_limit)), | |
1932 got_recursive, not_recursive); | |
1933 | |
1934 builder()->SetInsertPoint(got_recursive); | |
1935 builder()->CreateStore(LLVMValue::intptr_constant(0), monitor_header_addr); | |
1936 builder()->CreateBr(acquired_fast); | |
1937 | |
1938 // Create an edge for the state merge | |
1939 builder()->SetInsertPoint(acquired_fast); | |
1940 SharkState *fast_state = current_state()->copy(); | |
1941 builder()->CreateBr(lock_acquired); | |
1942 | |
1943 // It's not a recursive case so we need to drop into the runtime | |
1944 builder()->SetInsertPoint(not_recursive); | |
1945 call_vm( | |
1946 builder()->monitorenter(), monitor_addr, | |
1947 exception_action | EAM_MONITOR_FUDGE); | |
1948 BasicBlock *acquired_slow = builder()->GetInsertBlock(); | |
1949 builder()->CreateBr(lock_acquired); | |
1950 | |
1951 // All done | |
1952 builder()->SetInsertPoint(lock_acquired); | |
1953 current_state()->merge(fast_state, acquired_fast, acquired_slow); | |
1954 } | |
1955 | |
1956 void SharkTopLevelBlock::release_lock(int exception_action) { | |
1957 BasicBlock *not_recursive = function()->CreateBlock("not_recursive"); | |
1958 BasicBlock *released_fast = function()->CreateBlock("released_fast"); | |
1959 BasicBlock *slow_path = function()->CreateBlock("slow_path"); | |
1960 BasicBlock *lock_released = function()->CreateBlock("lock_released"); | |
1961 | |
1962 int monitor = num_monitors() - 1; | |
1963 Value *monitor_addr = stack()->monitor_addr(monitor); | |
1964 Value *monitor_object_addr = stack()->monitor_object_addr(monitor); | |
1965 Value *monitor_header_addr = stack()->monitor_header_addr(monitor); | |
1966 | |
1967 // If it is recursive then we're already done | |
1968 Value *disp = builder()->CreateLoad(monitor_header_addr); | |
1969 builder()->CreateCondBr( | |
1970 builder()->CreateICmpEQ(disp, LLVMValue::intptr_constant(0)), | |
1971 released_fast, not_recursive); | |
1972 | |
1973 // Try a simple unlock | |
1974 builder()->SetInsertPoint(not_recursive); | |
1975 | |
1976 Value *lock = builder()->CreatePtrToInt( | |
1977 monitor_header_addr, SharkType::intptr_type()); | |
1978 | |
1979 Value *lockee = builder()->CreateLoad(monitor_object_addr); | |
1980 | |
1981 Value *mark_addr = builder()->CreateAddressOfStructEntry( | |
1982 lockee, in_ByteSize(oopDesc::mark_offset_in_bytes()), | |
1983 PointerType::getUnqual(SharkType::intptr_type()), | |
1984 "mark_addr"); | |
1985 | |
1986 Value *check = builder()->CreateCmpxchgPtr(disp, mark_addr, lock); | |
1987 builder()->CreateCondBr( | |
1988 builder()->CreateICmpEQ(lock, check), | |
1989 released_fast, slow_path); | |
1990 | |
1991 // Create an edge for the state merge | |
1992 builder()->SetInsertPoint(released_fast); | |
1993 SharkState *fast_state = current_state()->copy(); | |
1994 builder()->CreateBr(lock_released); | |
1995 | |
1996 // Need to drop into the runtime to release this one | |
1997 builder()->SetInsertPoint(slow_path); | |
1998 call_vm(builder()->monitorexit(), monitor_addr, exception_action); | |
1999 BasicBlock *released_slow = builder()->GetInsertBlock(); | |
2000 builder()->CreateBr(lock_released); | |
2001 | |
2002 // All done | |
2003 builder()->SetInsertPoint(lock_released); | |
2004 current_state()->merge(fast_state, released_fast, released_slow); | |
2005 | |
2006 // The object slot is now dead | |
2007 set_num_monitors(monitor); | |
2008 } |