Change the arena's chunk tree from a splay tree to an ordinary tree (so that it's not possible to accidentally splay it and leave it unbalanced).
New function TreeFindNext allows us to implement TractFirst and TractNext without having to splay the tree.
Make sure all operations on the chunk tree leave it balanced. But don't balance the tree directly in ChunkFinish() because this is only ever called in a loop where multiple chunks are being deleted from the tre. Instead use the sequence TreeToVine -- iterate and delete -- TreeBalance. The new macro TREE_DESTROY assists with this.
No need any more for ArenaIsReservedAddr, CHUNK_OF_ADDR, TRACT_OF_ADDR.
Update design documentation.
Copied from Perforce
Change: 186212
ServerID: perforce.ravenbrook.com
Balance the chunk tree after insertion and deletion.
Avoid calling TractFirst and TractNext in ArenaDescribeTracts and PoolOfRange.
Copied from Perforce
Change: 186199
ServerID: perforce.ravenbrook.com
Make sure that we can tear down the arena if ArenaCreate fails:
1. Don't set hasFreeCBS until the block pool has some pages.
2. Finish the CBS block pool in ArenaFinish, not ArenaDestroy.
3. Delete the chunk from the arena's free CBS before destroying the chunk, just in case the chunk contains pages from the CBS's block pool.
Copied from Perforce
Change: 186177
ServerID: perforce.ravenbrook.com
1. Where Type is a pointer type with a signature, replace CHECKL(TypeCheck(val)) with CHECKD(Type, val).
2. Where Type is a pointer type with no signature, replace CHECKL(TypeCheck(val)) with CHECKD_NOSIG(Type, val).
3. Where Type is a pointer type with a signature, but the structure is not visible at point of checking, replace CHECKL(TypeCheck(val)) with CHECKD_NOSIG(Type, val). Reference <design/check/#.hidden-type>
4. Make BTCheck extern and use it where possible.
5. Replace AVER(TypeCheck(val)) with AVERT(Type, val).
Copied from Perforce
Change: 185263
ServerID: perforce.ravenbrook.com
* Bring design up to date.
* New function PoolHasAttr encapsulates attribute checking.
* Abstract classes are abstract and mustn't be checked.
* The dummy pool class in fotest needs a size.
* Abstract pool classes null out methods that they can't provide a generic implementation for, to force subclasses to provide one.
* New function PoolTrivFramePopPending provides a generic implementation of that method.
* Rename PoolNoFreeWalk to PoolTrivFreeWalk since it has NOOP rather than NOTREACHED.
* Check that AttrMOVINGGC implies AttrGC.
* Remove unimplemented attributes (BUF_RESERVE, BUF_ALLOC, INCR_RB, INCR_WB, PM)
* AMC now inherits from AMCZ instead of the other way round. This is simpler: AMC adds features to AMCZ rather than AMCZ taking features away (and not quite getting it right).
* Similarly, LO inherits from AbstractSegBufPoolClass + PoolClassMixInCollect so that it doesn't have to clear AttrSCAN and the scan methods.
* Fix bug in MFSCheck -- mustn't check unroundedUnitSize >= UNIT_MIN since small unit sizes are rounded up to UNIT_MIN.
* Don't see AttrFREE in MRG (since no free method is supplied).
* Check AttrSCAN systematically (in PoolScan and SegCheck) rather than opportunistically in TraceStart and TraceQuantum.
Copied from Perforce
Change: 185231
ServerID: perforce.ravenbrook.com
* Refactor nmake files so that a compiler-specific makefile is included; move Microsoft Visual C-specific options to mv.nmk.
* Add nmake files for Pelles (w3i3pc.nmk and pc.nmk).
* Rename spw3i3mv.c to spw3i3.c and spw3i6mv.c to spw3i6.c since these are also used by Pelles C.
* Make reasonable changes to the source code to avoid warnings from Pelles C:
** check results of function calls;
** avoid useless return values;
** undef max before defining it;
** ensure printf formats are checkable;
** move notreached() assertions to the end of blocks;
** suppress warnings in cases where the code shouldn't be changed ("Unreachable code", "Inline assembly code is not portable", "Structured Exception Handling is not portable").
Copied from Perforce
Change: 184977
ServerID: perforce.ravenbrook.com
Renaming the arena’s “zoned CBS” back to earlier “free CBS”, especially since it might not be zoned.
Copied from Perforce
Change: 184738
ServerID: perforce.ravenbrook.com
Fixing related corner case in arenaAllocFindInFreeCBS when it thought it couldn’t find a block when it was in fact running out of nodes. This was revealed by “gcbench --npass 1 --arena-size 1M --seed 945632066 --niter 1 amc”.
Fixing draft ArenaFreeCBSDelete after exercising it.
Copied from Perforce
Change: 184568
ServerID: perforce.ravenbrook.com
ArenaDestroy fixed so that ChunkDestroy can go ahead even though the freeCBS has been torn down. Allows completion of test programs.
Copied from Perforce
Change: 184295
ServerID: perforce.ravenbrook.com
Removing redundant SegPref structures from pools that only ever used the default.
Abolishing the VMNZ arena class, to be replaced with an option to ArenaCreate.
Copied from Perforce
Change: 184293
ServerID: perforce.ravenbrook.com
ArenaSpareCommitExceeded changed to ArenaPurgeSpare so that the arena can properly reduce the amount of spare memory when setting the commit limit etc.
pagesMarkAllocated promptly unmaps page table pages in its error path.
Miscellaneous clarifications and extra checking.
Copied from Perforce
Change: 184267
ServerID: perforce.ravenbrook.com
Not quite working yet. This code fails to unmap unused page table pages, and so triggers an assertion at chunk finish.
Copied from Perforce
Change: 184246
ServerID: perforce.ravenbrook.com
Eliminating SegPrefExpress in most places, especially where there wasn’t really any preference.
Eliminating special case knowledge about garbage collection from the arena.
Copied from Perforce
Change: 184279
ServerID: perforce.ravenbrook.com
