#2224: -fhpc inteferes/prevents rewrite rules from firing
---------------------------+------------------------------------------------
Reporter: dons | Owner: [EMAIL PROTECTED]
Type: bug | Status: new
Priority: normal | Component: Code Coverage
Version: 6.8.2 | Severity: normal
Keywords: rules, hpc | Testcase:
Architecture: Unknown | Os: Unknown
---------------------------+------------------------------------------------
Use case:
I'm writing tests for rewrite rules, and using HPC to determine if rules
were fired (and their code exercised). HPC is quite cool here, since it
lets us see which rules fired, without needing to explicitly export
functions to test.
However, -fhpc seems to prevent many rules from firing (likely due to
ticks getting in the way?)
For example:
{{{
import qualified Data.ByteString.Char8 as C
main = print (C.pack "literal")
}}}
When compiled normally, triggers a nice rewrite rule:
{{{
$ ghc -O2 A.hs -ddump-simpl-stats A.hs -c
1 ByteString pack/packAddress
}}}
Now with -fhpc:
{{{
2 RuleFired
1 unpack
1 unpack-list
}}}
What's the best way to ensure the same code is exercised with and without
-fhpc here? (I'd quite like to get this working, since rewrite rules
benefit from testing.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2224>
GHC <http://www.haskell.org/ghc/>
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