#4902: Create a primop for getting the size of an Array#
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Reporter: tibbe | Owner:
Type: feature request | Status: new
Priority: normal | Component: Runtime System
Version: 7.0.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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We currently store the size of `Array#`s (and `MutableArray#`s):
{{{
typedef struct {
StgHeader header;
StgWord ptrs;
StgWord size; // ptrs plus card table
StgClosure *payload[FLEXIBLE_ARRAY];
// see also: StgMutArrPtrs macros in ClosureMacros.h
} StgMutArrPtrs;
}}}
However, there's currently no way to read this information. This means
that array types defined in terms of the two primitive array types need to
store this size, even though it's already stored by GHC.
I think we should expose `sizeOfArray#` and `sizeOfMutableArray#`.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4902>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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