ghc-9.0.0.20201227: The GHC API
Safe HaskellNone
LanguageHaskell2010

GHC.Driver.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

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

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

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.