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|
-----------------------------------------------------------------------------
--
-- Static flags
--
-- Static flags can only be set once, on the command-line. Inside GHC,
-- each static flag corresponds to a top-level value, usually of type Bool.
--
-- (c) The University of Glasgow 2005
--
-----------------------------------------------------------------------------
module StaticFlagParser (
parseStaticFlags,
parseStaticFlagsFull,
flagsStatic
) where
#include "HsVersions.h"
import qualified StaticFlags as SF
import StaticFlags ( v_opt_C_ready, getWayFlags, Way(..)
, opt_SimplExcessPrecision )
import CmdLineParser
import SrcLoc
import Util
import Panic
import Control.Monad
import Data.Char
import Data.IORef
import Data.List
-----------------------------------------------------------------------------
-- Static flags
-- | Parses GHC's static flags from a list of command line arguments.
--
-- These flags are static in the sense that they can be set only once and they
-- are global, meaning that they affect every instance of GHC running;
-- multiple GHC threads will use the same flags.
--
-- This function must be called before any session is started, i.e., before
-- the first call to 'GHC.withGhc'.
--
-- Static flags are more of a hack and are static for more or less historical
-- reasons. In the long run, most static flags should eventually become
-- dynamic flags.
--
-- XXX: can we add an auto-generated list of static flags here?
--
parseStaticFlags :: [Located String] -> IO ([Located String], [Located String])
parseStaticFlags = parseStaticFlagsFull flagsStatic
-- | Parse GHC's static flags as @parseStaticFlags@ does. However it also
-- takes a list of available static flags, such that certain flags can be
-- enabled or disabled through this argument.
parseStaticFlagsFull :: [Flag IO] -> [Located String]
-> IO ([Located String], [Located String])
parseStaticFlagsFull flagsAvailable args = do
ready <- readIORef v_opt_C_ready
when ready $ ghcError (ProgramError "Too late for parseStaticFlags: call it before newSession")
(leftover, errs, warns1) <- processArgs flagsAvailable args
when (not (null errs)) $ ghcError $ errorsToGhcException errs
-- deal with the way flags: the way (eg. prof) gives rise to
-- further flags, some of which might be static.
way_flags <- getWayFlags
let way_flags' = map (mkGeneralLocated "in way flags") way_flags
-- as these are GHC generated flags, we parse them with all static flags
-- in scope, regardless of what availableFlags are passed in.
(more_leftover, errs, warns2) <- processArgs flagsStatic way_flags'
-- see sanity code in staticOpts
writeIORef v_opt_C_ready True
-- HACK: -fexcess-precision is both a static and a dynamic flag. If
-- the static flag parser has slurped it, we must return it as a
-- leftover too. ToDo: make -fexcess-precision dynamic only.
let excess_prec
| opt_SimplExcessPrecision = map (mkGeneralLocated "in excess_prec")
["-fexcess-precision"]
| otherwise = []
when (not (null errs)) $ ghcError $ errorsToGhcException errs
return (excess_prec ++ more_leftover ++ leftover,
warns1 ++ warns2)
flagsStatic :: [Flag IO]
-- All the static flags should appear in this list. It describes how each
-- static flag should be processed. Two main purposes:
-- (a) if a command-line flag doesn't appear in the list, GHC can complain
-- (b) a command-line flag may remove, or add, other flags; e.g. the "-fno-X" things
--
-- The common (PassFlag addOpt) action puts the static flag into the bunch of
-- things that are searched up by the top-level definitions like
-- opt_foo = lookUp (fsLit "-dfoo")
-- Note that ordering is important in the following list: any flag which
-- is a prefix flag (i.e. HasArg, Prefix, OptPrefix, AnySuffix) will override
-- flags further down the list with the same prefix.
flagsStatic = [
------- ways --------------------------------------------------------
Flag "prof" (NoArg (addWay WayProf))
, Flag "eventlog" (NoArg (addWay WayEventLog))
, Flag "parallel" (NoArg (addWay WayPar))
, Flag "gransim" (NoArg (addWay WayGran))
, Flag "smp" (NoArg (addWay WayThreaded >> deprecate "Use -threaded instead"))
, Flag "debug" (NoArg (addWay WayDebug))
, Flag "ndp" (NoArg (addWay WayNDP))
, Flag "threaded" (NoArg (addWay WayThreaded))
, Flag "ticky" (PassFlag (\f -> do addOpt f; addWay WayDebug))
-- -ticky enables ticky-ticky code generation, and also implies -debug which
-- is required to get the RTS ticky support.
------ Debugging ----------------------------------------------------
, Flag "dppr-debug" (PassFlag addOpt)
, Flag "dsuppress-all" (PassFlag addOpt)
, Flag "dsuppress-uniques" (PassFlag addOpt)
, Flag "dsuppress-coercions" (PassFlag addOpt)
, Flag "dsuppress-module-prefixes" (PassFlag addOpt)
, Flag "dsuppress-type-applications" (PassFlag addOpt)
, Flag "dsuppress-idinfo" (PassFlag addOpt)
, Flag "dsuppress-var-kinds" (PassFlag addOpt)
, Flag "dsuppress-type-signatures" (PassFlag addOpt)
, Flag "dopt-fuel" (AnySuffix addOpt)
, Flag "dno-debug-output" (PassFlag addOpt)
, Flag "dstub-dead-values" (PassFlag addOpt)
-- rest of the debugging flags are dynamic
----- Linker --------------------------------------------------------
, Flag "static" (PassFlag addOpt)
, Flag "dynamic" (NoArg (removeOpt "-static" >> addWay WayDyn))
-- ignored for compat w/ gcc:
, Flag "rdynamic" (NoArg (return ()))
----- RTS opts ------------------------------------------------------
, Flag "H" (HasArg (\s -> liftEwM (setHeapSize (fromIntegral (decodeSize s)))))
, Flag "Rghc-timing" (NoArg (liftEwM enableTimingStats))
------ Compiler flags -----------------------------------------------
-- All other "-fno-<blah>" options cancel out "-f<blah>" on the hsc cmdline
, Flag "fno-"
(PrefixPred (\s -> isStaticFlag ("f"++s)) (\s -> removeOpt ("-f"++s)))
-- Pass all remaining "-f<blah>" options to hsc
, Flag "f" (AnySuffixPred isStaticFlag addOpt)
]
isStaticFlag :: String -> Bool
isStaticFlag f =
f `elem` [
"fdicts-strict",
"fspec-inline-join-points",
"fno-hi-version-check",
"dno-black-holing",
"fno-state-hack",
"fsimple-list-literals",
"fruntime-types",
"fno-pre-inlining",
"fno-opt-coercion",
"fexcess-precision",
"static",
"fhardwire-lib-paths",
"fcpr-off",
"ferror-spans",
"fhpc"
]
|| any (`isPrefixOf` f) [
"fliberate-case-threshold",
"fmax-worker-args",
"fhistory-size",
"funfolding-creation-threshold",
"funfolding-dict-threshold",
"funfolding-use-threshold",
"funfolding-fun-discount",
"funfolding-keeness-factor"
]
-----------------------------------------------------------------------------
-- convert sizes like "3.5M" into integers
decodeSize :: String -> Integer
decodeSize str
| c == "" = truncate n
| c == "K" || c == "k" = truncate (n * 1000)
| c == "M" || c == "m" = truncate (n * 1000 * 1000)
| c == "G" || c == "g" = truncate (n * 1000 * 1000 * 1000)
| otherwise = ghcError (CmdLineError ("can't decode size: " ++ str))
where (m, c) = span pred str
n = readRational m
pred c = isDigit c || c == '.'
type StaticP = EwM IO
addOpt :: String -> StaticP ()
addOpt = liftEwM . SF.addOpt
addWay :: Way -> StaticP ()
addWay = liftEwM . SF.addWay
removeOpt :: String -> StaticP ()
removeOpt = liftEwM . SF.removeOpt
-----------------------------------------------------------------------------
-- RTS Hooks
foreign import ccall unsafe "setHeapSize" setHeapSize :: Int -> IO ()
foreign import ccall unsafe "enableTimingStats" enableTimingStats :: IO ()
|
