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fix allocator corruption for large sizes (#7338)

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* fix allocator corruption for large sizes
* allow large chunks to coalesce and added test case
* use correct constants in MaxBigChunkSize
This commit is contained in:
jcosborn 2018-03-17 17:59:04 -05:00 • committed by Andreas Rumpf
commit e39f2a9283
5 changed files with 92 additions and 41 deletions
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52
tests/system/alloc.nim
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@ -1,52 +0,0 @@
var x: ptr int
x = cast[ptr int](alloc(7))
assert x != nil
x = cast[ptr int](x.realloc(2))
assert x != nil
x.dealloc()
x = createU(int, 3)
assert x != nil
x.free()
x = create(int, 4)
assert cast[ptr array[4, int]](x)[0] == 0
assert cast[ptr array[4, int]](x)[1] == 0
assert cast[ptr array[4, int]](x)[2] == 0
assert cast[ptr array[4, int]](x)[3] == 0
x = x.resize(4)
assert x != nil
x.free()
x = cast[ptr int](allocShared(100))
assert x != nil
deallocShared(x)
x = createSharedU(int, 3)
assert x != nil
x.freeShared()
x = createShared(int, 3)
assert x != nil
assert cast[ptr array[3, int]](x)[0] == 0
assert cast[ptr array[3, int]](x)[1] == 0
assert cast[ptr array[3, int]](x)[2] == 0
assert x != nil
x = cast[ptr int](x.resizeShared(2))
assert x != nil
x.freeShared()
x = create(int, 10)
assert x != nil
x = x.resize(12)
assert x != nil
x.dealloc()
x = createShared(int, 1)
assert x != nil
x = x.resizeShared(1)
assert x != nil
x.freeShared()