#3800: sizeofByteArray# returns allocated words, not requested length in bytes
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Reporter: AntoineLatter | Owner:
Type: bug | Status: new
Priority: high | Milestone: 6.14.1
Component: Compiler | Version: 6.12.1
Keywords: | Difficulty:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: Incorrect result at runtime
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Description changed by igloo:
Old description:
> A byte array allocated with (GHC.Prim.newByteArray# 7) will report it's
> size as '8' - that is, the stored size in StgArrWords is the number of
> allocated words, not the number of requested bytes.
>
> This menas that if I want to a GHC.Prim.ByteArray# or MutableByteArray#
> as an array type, I need a separate length fields.
>
> See also: http://www.haskell.org/pipermail/glasgow-haskell-
> users/2009-December/018199.html
New description:
A byte array allocated with (`GHC.Prim.newByteArray# 7`) will report it's
size as '8' - that is, the stored size in `StgArrWords` is the number of
allocated words, not the number of requested bytes.
This menas that if I want to a `GHC.Prim.ByteArray#` or
`MutableByteArray#` as an array type, I need a separate length fields.
See also: http://www.haskell.org/pipermail/glasgow-haskell-
users/2009-December/018199.html
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3800#comment:6>
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The Glasgow Haskell Compiler
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