Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/opto/graphKit.cpp
src/share/vm/opto/graphKit.cpp
- changeset 1648
- 6deeaebad47a
- parent 1601
- 7b0e9cba0307
- child 1692
- 7b4415a18c8a
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| 1631:f3345b7b01b4 | 1648:6deeaebad47a |
|---|---|
| 1 /* | 1 /* |
| 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. | 2 * Copyright 2001-2010 Sun Microsystems, Inc. All Rights Reserved. |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | 4 * |
| 5 * This code is free software; you can redistribute it and/or modify it | 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 | 6 * under the terms of the GNU General Public License version 2 only, as |
| 7 * published by the Free Software Foundation. | 7 * published by the Free Software Foundation. |
| 453 return method->java_code_at_bci(bci); | 453 return method->java_code_at_bci(bci); |
| 454 else | 454 else |
| 455 return Bytecodes::_illegal; | 455 return Bytecodes::_illegal; |
| 456 } | 456 } |
| 457 | 457 |
| 458 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, | |
| 459 bool must_throw) { | |
| 460 // if the exception capability is set, then we will generate code | |
| 461 // to check the JavaThread.should_post_on_exceptions flag to see | |
| 462 // if we actually need to report exception events (for this | |
| 463 // thread). If we don't need to report exception events, we will | |
| 464 // take the normal fast path provided by add_exception_events. If | |
| 465 // exception event reporting is enabled for this thread, we will | |
| 466 // take the uncommon_trap in the BuildCutout below. | |
| 467 | |
| 468 // first must access the should_post_on_exceptions_flag in this thread's JavaThread | |
| 469 Node* jthread = _gvn.transform(new (C, 1) ThreadLocalNode()); | |
| 470 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset())); | |
| 471 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, false); | |
| 472 | |
| 473 // Test the should_post_on_exceptions_flag vs. 0 | |
| 474 Node* chk = _gvn.transform( new (C, 3) CmpINode(should_post_flag, intcon(0)) ); | |
| 475 Node* tst = _gvn.transform( new (C, 2) BoolNode(chk, BoolTest::eq) ); | |
| 476 | |
| 477 // Branch to slow_path if should_post_on_exceptions_flag was true | |
| 478 { BuildCutout unless(this, tst, PROB_MAX); | |
| 479 // Do not try anything fancy if we're notifying the VM on every throw. | |
| 480 // Cf. case Bytecodes::_athrow in parse2.cpp. | |
| 481 uncommon_trap(reason, Deoptimization::Action_none, | |
| 482 (ciKlass*)NULL, (char*)NULL, must_throw); | |
| 483 } | |
| 484 | |
| 485 } | |
| 486 | |
| 458 //------------------------------builtin_throw---------------------------------- | 487 //------------------------------builtin_throw---------------------------------- |
| 459 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { | 488 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { |
| 460 bool must_throw = true; | 489 bool must_throw = true; |
| 461 | 490 |
| 462 if (env()->jvmti_can_post_exceptions()) { | 491 if (env()->jvmti_can_post_on_exceptions()) { |
| 463 // Do not try anything fancy if we're notifying the VM on every throw. | 492 // check if we must post exception events, take uncommon trap if so |
| 464 // Cf. case Bytecodes::_athrow in parse2.cpp. | 493 uncommon_trap_if_should_post_on_exceptions(reason, must_throw); |
| 465 uncommon_trap(reason, Deoptimization::Action_none, | 494 // here if should_post_on_exceptions is false |
| 466 (ciKlass*)NULL, (char*)NULL, must_throw); | 495 // continue on with the normal codegen |
| 467 return; | |
| 468 } | 496 } |
| 469 | 497 |
| 470 // If this particular condition has not yet happened at this | 498 // If this particular condition has not yet happened at this |
| 471 // bytecode, then use the uncommon trap mechanism, and allow for | 499 // bytecode, then use the uncommon trap mechanism, and allow for |
| 472 // a future recompilation if several traps occur here. | 500 // a future recompilation if several traps occur here. |
