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comparison src/share/vm/gc_implementation/g1/g1BlockOffsetTable.hpp @ 2133:2250ee17e258

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7007068: G1: refine the BOT during evac failure handling Summary: During evacuation failure handling we refine the BOT to reflect the location of all the objects in the regions we scan. The changeset includes some minor cleanup: a) non-product print_on() method on the G1 BOT class, b) added more complete BOT verification during heap / region verification, c) slight modification to the BOT set up for humongous regions to be more consistent with the BOT set up during evac failure handling, and d) removed a couple of unused methods. Reviewed-by: johnc, ysr
author tonyp
date Wed, 12 Jan 2011 13:06:00 -0500
parents f95d63e2154a
children d2a62e0f25eb
comparison
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2132:4947ee68d19c 2133:2250ee17e258
1 /* 1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. 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.
350 } 350 }
351 351
352 // The following methods are useful and optimized for a 352 // The following methods are useful and optimized for a
353 // general, non-contiguous space. 353 // general, non-contiguous space.
354 354
355 // The given arguments are required to be the starts of adjacent ("blk1"
356 // before "blk2") well-formed blocks covered by "this". After this call,
357 // they should be considered to form one block.
358 virtual void join_blocks(HeapWord* blk1, HeapWord* blk2);
359
360 // Given a block [blk_start, blk_start + full_blk_size), and 355 // Given a block [blk_start, blk_start + full_blk_size), and
361 // a left_blk_size < full_blk_size, adjust the BOT to show two 356 // a left_blk_size < full_blk_size, adjust the BOT to show two
362 // blocks [blk_start, blk_start + left_blk_size) and 357 // blocks [blk_start, blk_start + left_blk_size) and
363 // [blk_start + left_blk_size, blk_start + full_blk_size). 358 // [blk_start + left_blk_size, blk_start + full_blk_size).
364 // It is assumed (and verified in the non-product VM) that the 359 // It is assumed (and verified in the non-product VM) that the
427 422
428 inline void verify_single_block(HeapWord* blk, size_t size) { 423 inline void verify_single_block(HeapWord* blk, size_t size) {
429 verify_single_block(blk, blk + size); 424 verify_single_block(blk, blk + size);
430 } 425 }
431 426
427 // Used by region verification. Checks that the contents of the
428 // BOT reflect that there's a single object that spans the address
429 // range [obj_start, obj_start + word_size); returns true if this is
430 // the case, returns false if it's not.
431 bool verify_for_object(HeapWord* obj_start, size_t word_size) const;
432
432 // Verify that the given block is before _unallocated_block 433 // Verify that the given block is before _unallocated_block
433 inline void verify_not_unallocated(HeapWord* blk_start, 434 inline void verify_not_unallocated(HeapWord* blk_start,
434 HeapWord* blk_end) const { 435 HeapWord* blk_end) const {
435 if (BlockOffsetArrayUseUnallocatedBlock) { 436 if (BlockOffsetArrayUseUnallocatedBlock) {
436 assert(blk_start < blk_end, "Block inconsistency?"); 437 assert(blk_start < blk_end, "Block inconsistency?");
442 verify_not_unallocated(blk, blk + size); 443 verify_not_unallocated(blk, blk + size);
443 } 444 }
444 445
445 void check_all_cards(size_t left_card, size_t right_card) const; 446 void check_all_cards(size_t left_card, size_t right_card) const;
446 447
447 virtual void set_for_starts_humongous(HeapWord* new_end); 448 virtual void print_on(outputStream* out) PRODUCT_RETURN;
448 }; 449 };
449 450
450 // A subtype of BlockOffsetArray that takes advantage of the fact 451 // A subtype of BlockOffsetArray that takes advantage of the fact
451 // that its underlying space is a ContiguousSpace, so that its "active" 452 // that its underlying space is a ContiguousSpace, so that its "active"
452 // region can be more efficiently tracked (than for a non-contiguous space). 453 // region can be more efficiently tracked (than for a non-contiguous space).
492 } 493 }
493 494
494 HeapWord* block_start_unsafe(const void* addr); 495 HeapWord* block_start_unsafe(const void* addr);
495 HeapWord* block_start_unsafe_const(const void* addr) const; 496 HeapWord* block_start_unsafe_const(const void* addr) const;
496 497
497 virtual void set_for_starts_humongous(HeapWord* new_end); 498 void set_for_starts_humongous(HeapWord* new_top);
499
500 virtual void print_on(outputStream* out) PRODUCT_RETURN;
498 }; 501 };
499 502
500 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_HPP 503 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_HPP