Safe Haskell	None
Language	Haskell2010

GHC.Driver.Ways

Contents

Host GHC ways

Description

Ways

The central concept of a "way" is that all objects in a given program must be compiled in the same "way". Certain options change parameters of the virtual machine, eg. profiling adds an extra word to the object header, so profiling objects cannot be linked with non-profiling objects.

After parsing the command-line options, we determine which "way" we are building - this might be a combination way, eg. profiling+threaded.

There are two kinds of ways: - RTS only: only affect the runtime system (RTS) and don't affect code generation (e.g. threaded, debug) - Full ways: affect code generation and the RTS (e.g. profiling, dynamic linking)

We then find the "build-tag" associated with this way, and this becomes the suffix used to find .hi files and libraries used in this compilation.

Synopsis

data Way
- = WayCustom String
- | WayThreaded
- | WayDebug
- | WayProf
- | WayEventLog
- | WayDyn
hasWay :: Set Way -> Way -> Bool
allowed_combination :: Set Way -> Bool
wayGeneralFlags :: Platform -> Way -> [GeneralFlag]
wayUnsetGeneralFlags :: Platform -> Way -> [GeneralFlag]
wayOptc :: Platform -> Way -> [String]
wayOptl :: Platform -> Way -> [String]
wayOptP :: Platform -> Way -> [String]
wayDesc :: Way -> String
wayRTSOnly :: Way -> Bool
wayTag :: Way -> String
waysTag :: Set Way -> String
waysBuildTag :: Set Way -> String
hostFullWays :: Set Way
hostIsProfiled :: Bool
hostIsDynamic :: Bool

Documentation

data Way Source #

A way

Don't change the constructor order as it us used by waysTag to create a unique tag (e.g. thr_debug_p) which is expected by other tools (e.g. Cabal).

Constructors

WayCustom String	for GHC API clients building custom variants
WayThreaded	(RTS only) Multithreaded runtime system
WayDebug	Debugging, enable trace messages and extra checks
WayProf	Profiling, enable cost-centre stacks and profiling reports
WayEventLog	(RTS only) enable event logging
WayDyn	Dynamic linking

Instances

Instances details

Eq Way #
Instance details Defined in GHC.Driver.Ways Methods (==) :: Way -> Way -> Bool # (/=) :: Way -> Way -> Bool #
Ord Way #
Instance details Defined in GHC.Driver.Ways Methods compare :: Way -> Way -> Ordering # (<) :: Way -> Way -> Bool # (<=) :: Way -> Way -> Bool # (>) :: Way -> Way -> Bool # (>=) :: Way -> Way -> Bool # max :: Way -> Way -> Way # min :: Way -> Way -> Way #
Show Way #
Instance details Defined in GHC.Driver.Ways Methods showsPrec :: Int -> Way -> ShowS Source # show :: Way -> String Source # showList :: [Way] -> ShowS Source #

hasWay :: Set Way -> Way -> Bool Source #

Test if a ways is enabled

allowed_combination :: Set Way -> Bool Source #

Check if a combination of ways is allowed

wayGeneralFlags :: Platform -> Way -> [GeneralFlag] Source #

Turn these flags on when enabling this way

wayUnsetGeneralFlags :: Platform -> Way -> [GeneralFlag] Source #

Turn these flags off when enabling this way

wayOptc :: Platform -> Way -> [String] Source #

Pass these options to the C compiler when enabling this way

wayOptl :: Platform -> Way -> [String] Source #

Pass these options to linker when enabling this way

wayOptP :: Platform -> Way -> [String] Source #

Pass these options to the preprocessor when enabling this way

wayDesc :: Way -> String Source #

wayRTSOnly :: Way -> Bool Source #

Return true for ways that only impact the RTS, not the generated code

wayTag :: Way -> String Source #

Unique build-tag associated to a way

waysTag :: Set Way -> String Source #

Unique tag associated to a list of ways

waysBuildTag :: Set Way -> String Source #

Unique build-tag associated to a list of ways

RTS only ways are filtered out because they have no impact on the build.

Host GHC ways

hostFullWays :: Set Way Source #

Return host "full" ways (i.e. ways that have an impact on the compilation, not RTS only ways). These ways must be used when compiling codes targeting the internal interpreter.

hostIsProfiled :: Bool Source #

Consult the RTS to find whether it has been built with profiling enabled.

hostIsDynamic :: Bool Source #

Consult the RTS to find whether GHC itself has been built with dynamic linking. This can't be statically known at compile-time, because we build both the static and dynamic versions together with -dynamic-too.