ghc-8.2.1: main/Finder.hs
{-
(c) The University of Glasgow, 2000-2006
\section[Finder]{Module Finder}
-}
{-# LANGUAGE CPP #-}
module Finder (
flushFinderCaches,
FindResult(..),
findImportedModule,
findPluginModule,
findExactModule,
findHomeModule,
findExposedPackageModule,
mkHomeModLocation,
mkHomeModLocation2,
mkHiOnlyModLocation,
mkHiPath,
mkObjPath,
addHomeModuleToFinder,
uncacheModule,
mkStubPaths,
findObjectLinkableMaybe,
findObjectLinkable,
cannotFindModule,
cannotFindInterface,
) where
#include "HsVersions.h"
import Module
import HscTypes
import Packages
import FastString
import Util
import PrelNames ( gHC_PRIM )
import DynFlags
import Outputable
import Maybes ( expectJust )
import Data.IORef ( IORef, readIORef, atomicModifyIORef' )
import System.Directory
import System.FilePath
import Control.Monad
import Data.Time
import Data.List ( foldl' )
type FileExt = String -- Filename extension
type BaseName = String -- Basename of file
-- -----------------------------------------------------------------------------
-- The Finder
-- The Finder provides a thin filesystem abstraction to the rest of
-- the compiler. For a given module, it can tell you where the
-- source, interface, and object files for that module live.
-- It does *not* know which particular package a module lives in. Use
-- Packages.lookupModuleInAllPackages for that.
-- -----------------------------------------------------------------------------
-- The finder's cache
-- remove all the home modules from the cache; package modules are
-- assumed to not move around during a session.
flushFinderCaches :: HscEnv -> IO ()
flushFinderCaches hsc_env =
atomicModifyIORef' fc_ref $ \fm -> (filterInstalledModuleEnv is_ext fm, ())
where
this_pkg = thisPackage (hsc_dflags hsc_env)
fc_ref = hsc_FC hsc_env
is_ext mod _ | not (installedModuleUnitId mod `installedUnitIdEq` this_pkg) = True
| otherwise = False
addToFinderCache :: IORef FinderCache -> InstalledModule -> InstalledFindResult -> IO ()
addToFinderCache ref key val =
atomicModifyIORef' ref $ \c -> (extendInstalledModuleEnv c key val, ())
removeFromFinderCache :: IORef FinderCache -> InstalledModule -> IO ()
removeFromFinderCache ref key =
atomicModifyIORef' ref $ \c -> (delInstalledModuleEnv c key, ())
lookupFinderCache :: IORef FinderCache -> InstalledModule -> IO (Maybe InstalledFindResult)
lookupFinderCache ref key = do
c <- readIORef ref
return $! lookupInstalledModuleEnv c key
-- -----------------------------------------------------------------------------
-- The three external entry points
-- | Locate a module that was imported by the user. We have the
-- module's name, and possibly a package name. Without a package
-- name, this function will use the search path and the known exposed
-- packages to find the module, if a package is specified then only
-- that package is searched for the module.
findImportedModule :: HscEnv -> ModuleName -> Maybe FastString -> IO FindResult
findImportedModule hsc_env mod_name mb_pkg =
case mb_pkg of
Nothing -> unqual_import
Just pkg | pkg == fsLit "this" -> home_import -- "this" is special
| otherwise -> pkg_import
where
home_import = findHomeModule hsc_env mod_name
pkg_import = findExposedPackageModule hsc_env mod_name mb_pkg
unqual_import = home_import
`orIfNotFound`
findExposedPackageModule hsc_env mod_name Nothing
-- | Locate a plugin module requested by the user, for a compiler
-- plugin. This consults the same set of exposed packages as
-- 'findImportedModule', unless @-hide-all-plugin-packages@ or
-- @-plugin-package@ are specified.
findPluginModule :: HscEnv -> ModuleName -> IO FindResult
findPluginModule hsc_env mod_name =
findHomeModule hsc_env mod_name
`orIfNotFound`
findExposedPluginPackageModule hsc_env mod_name
-- | Locate a specific 'Module'. The purpose of this function is to
-- create a 'ModLocation' for a given 'Module', that is to find out
-- where the files associated with this module live. It is used when
-- reading the interface for a module mentioned by another interface,
-- for example (a "system import").
findExactModule :: HscEnv -> InstalledModule -> IO InstalledFindResult
findExactModule hsc_env mod =
let dflags = hsc_dflags hsc_env
in if installedModuleUnitId mod `installedUnitIdEq` thisPackage dflags
then findInstalledHomeModule hsc_env (installedModuleName mod)
else findPackageModule hsc_env mod
-- -----------------------------------------------------------------------------
-- Helpers
-- | Given a monadic actions @this@ and @or_this@, first execute
-- @this@. If the returned 'FindResult' is successful, return
-- it; otherwise, execute @or_this@. If both failed, this function
-- also combines their failure messages in a reasonable way.
orIfNotFound :: Monad m => m FindResult -> m FindResult -> m FindResult
orIfNotFound this or_this = do
res <- this
case res of
NotFound { fr_paths = paths1, fr_mods_hidden = mh1
, fr_pkgs_hidden = ph1, fr_suggestions = s1 }
-> do res2 <- or_this
case res2 of
NotFound { fr_paths = paths2, fr_pkg = mb_pkg2, fr_mods_hidden = mh2
, fr_pkgs_hidden = ph2, fr_suggestions = s2 }
-> return (NotFound { fr_paths = paths1 ++ paths2
, fr_pkg = mb_pkg2 -- snd arg is the package search
, fr_mods_hidden = mh1 ++ mh2
, fr_pkgs_hidden = ph1 ++ ph2
, fr_suggestions = s1 ++ s2 })
_other -> return res2
_other -> return res
-- | Helper function for 'findHomeModule': this function wraps an IO action
-- which would look up @mod_name@ in the file system (the home package),
-- and first consults the 'hsc_FC' cache to see if the lookup has already
-- been done. Otherwise, do the lookup (with the IO action) and save
-- the result in the finder cache and the module location cache (if it
-- was successful.)
homeSearchCache :: HscEnv -> ModuleName -> IO InstalledFindResult -> IO InstalledFindResult
homeSearchCache hsc_env mod_name do_this = do
let mod = mkHomeInstalledModule (hsc_dflags hsc_env) mod_name
modLocationCache hsc_env mod do_this
findExposedPackageModule :: HscEnv -> ModuleName -> Maybe FastString
-> IO FindResult
findExposedPackageModule hsc_env mod_name mb_pkg
= findLookupResult hsc_env
$ lookupModuleWithSuggestions
(hsc_dflags hsc_env) mod_name mb_pkg
findExposedPluginPackageModule :: HscEnv -> ModuleName
-> IO FindResult
findExposedPluginPackageModule hsc_env mod_name
= findLookupResult hsc_env
$ lookupPluginModuleWithSuggestions
(hsc_dflags hsc_env) mod_name Nothing
findLookupResult :: HscEnv -> LookupResult -> IO FindResult
findLookupResult hsc_env r = case r of
LookupFound m pkg_conf -> do
let im = fst (splitModuleInsts m)
r' <- findPackageModule_ hsc_env im pkg_conf
case r' of
-- TODO: ghc -M is unlikely to do the right thing
-- with just the location of the thing that was
-- instantiated; you probably also need all of the
-- implicit locations from the instances
InstalledFound loc _ -> return (Found loc m)
InstalledNoPackage _ -> return (NoPackage (moduleUnitId m))
InstalledNotFound fp _ -> return (NotFound{ fr_paths = fp, fr_pkg = Just (moduleUnitId m)
, fr_pkgs_hidden = []
, fr_mods_hidden = []
, fr_suggestions = []})
LookupMultiple rs ->
return (FoundMultiple rs)
LookupHidden pkg_hiddens mod_hiddens ->
return (NotFound{ fr_paths = [], fr_pkg = Nothing
, fr_pkgs_hidden = map (moduleUnitId.fst) pkg_hiddens
, fr_mods_hidden = map (moduleUnitId.fst) mod_hiddens
, fr_suggestions = [] })
LookupNotFound suggest ->
return (NotFound{ fr_paths = [], fr_pkg = Nothing
, fr_pkgs_hidden = []
, fr_mods_hidden = []
, fr_suggestions = suggest })
modLocationCache :: HscEnv -> InstalledModule -> IO InstalledFindResult -> IO InstalledFindResult
modLocationCache hsc_env mod do_this = do
m <- lookupFinderCache (hsc_FC hsc_env) mod
case m of
Just result -> return result
Nothing -> do
result <- do_this
addToFinderCache (hsc_FC hsc_env) mod result
return result
mkHomeInstalledModule :: DynFlags -> ModuleName -> InstalledModule
mkHomeInstalledModule dflags mod_name =
let iuid = fst (splitUnitIdInsts (thisPackage dflags))
in InstalledModule iuid mod_name
-- This returns a module because it's more convenient for users
addHomeModuleToFinder :: HscEnv -> ModuleName -> ModLocation -> IO Module
addHomeModuleToFinder hsc_env mod_name loc = do
let mod = mkHomeInstalledModule (hsc_dflags hsc_env) mod_name
addToFinderCache (hsc_FC hsc_env) mod (InstalledFound loc mod)
return (mkModule (thisPackage (hsc_dflags hsc_env)) mod_name)
uncacheModule :: HscEnv -> ModuleName -> IO ()
uncacheModule hsc_env mod_name = do
let mod = mkHomeInstalledModule (hsc_dflags hsc_env) mod_name
removeFromFinderCache (hsc_FC hsc_env) mod
-- -----------------------------------------------------------------------------
-- The internal workers
findHomeModule :: HscEnv -> ModuleName -> IO FindResult
findHomeModule hsc_env mod_name = do
r <- findInstalledHomeModule hsc_env mod_name
return $ case r of
InstalledFound loc _ -> Found loc (mkModule uid mod_name)
InstalledNoPackage _ -> NoPackage uid -- impossible
InstalledNotFound fps _ -> NotFound {
fr_paths = fps,
fr_pkg = Just uid,
fr_mods_hidden = [],
fr_pkgs_hidden = [],
fr_suggestions = []
}
where
dflags = hsc_dflags hsc_env
uid = thisPackage dflags
-- | Implements the search for a module name in the home package only. Calling
-- this function directly is usually *not* what you want; currently, it's used
-- as a building block for the following operations:
--
-- 1. When you do a normal package lookup, we first check if the module
-- is available in the home module, before looking it up in the package
-- database.
--
-- 2. When you have a package qualified import with package name "this",
-- we shortcut to the home module.
--
-- 3. When we look up an exact 'Module', if the unit id associated with
-- the module is the current home module do a look up in the home module.
--
-- 4. Some special-case code in GHCi (ToDo: Figure out why that needs to
-- call this.)
findInstalledHomeModule :: HscEnv -> ModuleName -> IO InstalledFindResult
findInstalledHomeModule hsc_env mod_name =
homeSearchCache hsc_env mod_name $
let
dflags = hsc_dflags hsc_env
home_path = importPaths dflags
hisuf = hiSuf dflags
mod = mkHomeInstalledModule dflags mod_name
source_exts =
[ ("hs", mkHomeModLocationSearched dflags mod_name "hs")
, ("lhs", mkHomeModLocationSearched dflags mod_name "lhs")
, ("hsig", mkHomeModLocationSearched dflags mod_name "hsig")
, ("lhsig", mkHomeModLocationSearched dflags mod_name "lhsig")
]
hi_exts = [ (hisuf, mkHiOnlyModLocation dflags hisuf)
, (addBootSuffix hisuf, mkHiOnlyModLocation dflags hisuf)
]
-- In compilation manager modes, we look for source files in the home
-- package because we can compile these automatically. In one-shot
-- compilation mode we look for .hi and .hi-boot files only.
exts | isOneShot (ghcMode dflags) = hi_exts
| otherwise = source_exts
in
-- special case for GHC.Prim; we won't find it in the filesystem.
-- This is important only when compiling the base package (where GHC.Prim
-- is a home module).
if mod `installedModuleEq` gHC_PRIM
then return (InstalledFound (error "GHC.Prim ModLocation") mod)
else searchPathExts home_path mod exts
-- | Search for a module in external packages only.
findPackageModule :: HscEnv -> InstalledModule -> IO InstalledFindResult
findPackageModule hsc_env mod = do
let
dflags = hsc_dflags hsc_env
pkg_id = installedModuleUnitId mod
--
case lookupInstalledPackage dflags pkg_id of
Nothing -> return (InstalledNoPackage pkg_id)
Just pkg_conf -> findPackageModule_ hsc_env mod pkg_conf
-- | Look up the interface file associated with module @mod@. This function
-- requires a few invariants to be upheld: (1) the 'Module' in question must
-- be the module identifier of the *original* implementation of a module,
-- not a reexport (this invariant is upheld by @Packages.hs@) and (2)
-- the 'PackageConfig' must be consistent with the unit id in the 'Module'.
-- The redundancy is to avoid an extra lookup in the package state
-- for the appropriate config.
findPackageModule_ :: HscEnv -> InstalledModule -> PackageConfig -> IO InstalledFindResult
findPackageModule_ hsc_env mod pkg_conf =
ASSERT2( installedModuleUnitId mod == installedPackageConfigId pkg_conf, ppr (installedModuleUnitId mod) <+> ppr (installedPackageConfigId pkg_conf) )
modLocationCache hsc_env mod $
-- special case for GHC.Prim; we won't find it in the filesystem.
if mod `installedModuleEq` gHC_PRIM
then return (InstalledFound (error "GHC.Prim ModLocation") mod)
else
let
dflags = hsc_dflags hsc_env
tag = buildTag dflags
-- hi-suffix for packages depends on the build tag.
package_hisuf | null tag = "hi"
| otherwise = tag ++ "_hi"
mk_hi_loc = mkHiOnlyModLocation dflags package_hisuf
import_dirs = importDirs pkg_conf
-- we never look for a .hi-boot file in an external package;
-- .hi-boot files only make sense for the home package.
in
case import_dirs of
[one] | MkDepend <- ghcMode dflags -> do
-- there's only one place that this .hi file can be, so
-- don't bother looking for it.
let basename = moduleNameSlashes (installedModuleName mod)
loc <- mk_hi_loc one basename
return (InstalledFound loc mod)
_otherwise ->
searchPathExts import_dirs mod [(package_hisuf, mk_hi_loc)]
-- -----------------------------------------------------------------------------
-- General path searching
searchPathExts
:: [FilePath] -- paths to search
-> InstalledModule -- module name
-> [ (
FileExt, -- suffix
FilePath -> BaseName -> IO ModLocation -- action
)
]
-> IO InstalledFindResult
searchPathExts paths mod exts
= do result <- search to_search
{-
hPutStrLn stderr (showSDoc $
vcat [text "Search" <+> ppr mod <+> sep (map (text. fst) exts)
, nest 2 (vcat (map text paths))
, case result of
Succeeded (loc, p) -> text "Found" <+> ppr loc
Failed fs -> text "not found"])
-}
return result
where
basename = moduleNameSlashes (installedModuleName mod)
to_search :: [(FilePath, IO ModLocation)]
to_search = [ (file, fn path basename)
| path <- paths,
(ext,fn) <- exts,
let base | path == "." = basename
| otherwise = path </> basename
file = base <.> ext
]
search [] = return (InstalledNotFound (map fst to_search) (Just (installedModuleUnitId mod)))
search ((file, mk_result) : rest) = do
b <- doesFileExist file
if b
then do { loc <- mk_result; return (InstalledFound loc mod) }
else search rest
mkHomeModLocationSearched :: DynFlags -> ModuleName -> FileExt
-> FilePath -> BaseName -> IO ModLocation
mkHomeModLocationSearched dflags mod suff path basename = do
mkHomeModLocation2 dflags mod (path </> basename) suff
-- -----------------------------------------------------------------------------
-- Constructing a home module location
-- This is where we construct the ModLocation for a module in the home
-- package, for which we have a source file. It is called from three
-- places:
--
-- (a) Here in the finder, when we are searching for a module to import,
-- using the search path (-i option).
--
-- (b) The compilation manager, when constructing the ModLocation for
-- a "root" module (a source file named explicitly on the command line
-- or in a :load command in GHCi).
--
-- (c) The driver in one-shot mode, when we need to construct a
-- ModLocation for a source file named on the command-line.
--
-- Parameters are:
--
-- mod
-- The name of the module
--
-- path
-- (a): The search path component where the source file was found.
-- (b) and (c): "."
--
-- src_basename
-- (a): (moduleNameSlashes mod)
-- (b) and (c): The filename of the source file, minus its extension
--
-- ext
-- The filename extension of the source file (usually "hs" or "lhs").
mkHomeModLocation :: DynFlags -> ModuleName -> FilePath -> IO ModLocation
mkHomeModLocation dflags mod src_filename = do
let (basename,extension) = splitExtension src_filename
mkHomeModLocation2 dflags mod basename extension
mkHomeModLocation2 :: DynFlags
-> ModuleName
-> FilePath -- Of source module, without suffix
-> String -- Suffix
-> IO ModLocation
mkHomeModLocation2 dflags mod src_basename ext = do
let mod_basename = moduleNameSlashes mod
obj_fn = mkObjPath dflags src_basename mod_basename
hi_fn = mkHiPath dflags src_basename mod_basename
return (ModLocation{ ml_hs_file = Just (src_basename <.> ext),
ml_hi_file = hi_fn,
ml_obj_file = obj_fn })
mkHiOnlyModLocation :: DynFlags -> Suffix -> FilePath -> String
-> IO ModLocation
mkHiOnlyModLocation dflags hisuf path basename
= do let full_basename = path </> basename
obj_fn = mkObjPath dflags full_basename basename
return ModLocation{ ml_hs_file = Nothing,
ml_hi_file = full_basename <.> hisuf,
-- Remove the .hi-boot suffix from
-- hi_file, if it had one. We always
-- want the name of the real .hi file
-- in the ml_hi_file field.
ml_obj_file = obj_fn
}
-- | Constructs the filename of a .o file for a given source file.
-- Does /not/ check whether the .o file exists
mkObjPath
:: DynFlags
-> FilePath -- the filename of the source file, minus the extension
-> String -- the module name with dots replaced by slashes
-> FilePath
mkObjPath dflags basename mod_basename = obj_basename <.> osuf
where
odir = objectDir dflags
osuf = objectSuf dflags
obj_basename | Just dir <- odir = dir </> mod_basename
| otherwise = basename
-- | Constructs the filename of a .hi file for a given source file.
-- Does /not/ check whether the .hi file exists
mkHiPath
:: DynFlags
-> FilePath -- the filename of the source file, minus the extension
-> String -- the module name with dots replaced by slashes
-> FilePath
mkHiPath dflags basename mod_basename = hi_basename <.> hisuf
where
hidir = hiDir dflags
hisuf = hiSuf dflags
hi_basename | Just dir <- hidir = dir </> mod_basename
| otherwise = basename
-- -----------------------------------------------------------------------------
-- Filenames of the stub files
-- We don't have to store these in ModLocations, because they can be derived
-- from other available information, and they're only rarely needed.
mkStubPaths
:: DynFlags
-> ModuleName
-> ModLocation
-> FilePath
mkStubPaths dflags mod location
= let
stubdir = stubDir dflags
mod_basename = moduleNameSlashes mod
src_basename = dropExtension $ expectJust "mkStubPaths"
(ml_hs_file location)
stub_basename0
| Just dir <- stubdir = dir </> mod_basename
| otherwise = src_basename
stub_basename = stub_basename0 ++ "_stub"
in
stub_basename <.> "h"
-- -----------------------------------------------------------------------------
-- findLinkable isn't related to the other stuff in here,
-- but there's no other obvious place for it
findObjectLinkableMaybe :: Module -> ModLocation -> IO (Maybe Linkable)
findObjectLinkableMaybe mod locn
= do let obj_fn = ml_obj_file locn
maybe_obj_time <- modificationTimeIfExists obj_fn
case maybe_obj_time of
Nothing -> return Nothing
Just obj_time -> liftM Just (findObjectLinkable mod obj_fn obj_time)
-- Make an object linkable when we know the object file exists, and we know
-- its modification time.
findObjectLinkable :: Module -> FilePath -> UTCTime -> IO Linkable
findObjectLinkable mod obj_fn obj_time = return (LM obj_time mod [DotO obj_fn])
-- We used to look for _stub.o files here, but that was a bug (#706)
-- Now GHC merges the stub.o into the main .o (#3687)
-- -----------------------------------------------------------------------------
-- Error messages
cannotFindModule :: DynFlags -> ModuleName -> FindResult -> SDoc
cannotFindModule = cantFindErr (sLit "Could not find module")
(sLit "Ambiguous module name")
cannotFindInterface :: DynFlags -> ModuleName -> InstalledFindResult -> SDoc
cannotFindInterface = cantFindInstalledErr (sLit "Failed to load interface for")
(sLit "Ambiguous interface for")
cantFindErr :: LitString -> LitString -> DynFlags -> ModuleName -> FindResult
-> SDoc
cantFindErr _ multiple_found _ mod_name (FoundMultiple mods)
| Just pkgs <- unambiguousPackages
= hang (ptext multiple_found <+> quotes (ppr mod_name) <> colon) 2 (
sep [text "it was found in multiple packages:",
hsep (map ppr pkgs) ]
)
| otherwise
= hang (ptext multiple_found <+> quotes (ppr mod_name) <> colon) 2 (
vcat (map pprMod mods)
)
where
unambiguousPackages = foldl' unambiguousPackage (Just []) mods
unambiguousPackage (Just xs) (m, ModOrigin (Just _) _ _ _)
= Just (moduleUnitId m : xs)
unambiguousPackage _ _ = Nothing
pprMod (m, o) = text "it is bound as" <+> ppr m <+>
text "by" <+> pprOrigin m o
pprOrigin _ ModHidden = panic "cantFindErr: bound by mod hidden"
pprOrigin m (ModOrigin e res _ f) = sep $ punctuate comma (
if e == Just True
then [text "package" <+> ppr (moduleUnitId m)]
else [] ++
map ((text "a reexport in package" <+>)
.ppr.packageConfigId) res ++
if f then [text "a package flag"] else []
)
cantFindErr cannot_find _ dflags mod_name find_result
= ptext cannot_find <+> quotes (ppr mod_name)
$$ more_info
where
more_info
= case find_result of
NoPackage pkg
-> text "no unit id matching" <+> quotes (ppr pkg) <+>
text "was found"
NotFound { fr_paths = files, fr_pkg = mb_pkg
, fr_mods_hidden = mod_hiddens, fr_pkgs_hidden = pkg_hiddens
, fr_suggestions = suggest }
| Just pkg <- mb_pkg, pkg /= thisPackage dflags
-> not_found_in_package pkg files
| not (null suggest)
-> pp_suggestions suggest $$ tried_these files
| null files && null mod_hiddens && null pkg_hiddens
-> text "It is not a module in the current program, or in any known package."
| otherwise
-> vcat (map pkg_hidden pkg_hiddens) $$
vcat (map mod_hidden mod_hiddens) $$
tried_these files
_ -> panic "cantFindErr"
build_tag = buildTag dflags
not_found_in_package pkg files
| build_tag /= ""
= let
build = if build_tag == "p" then "profiling"
else "\"" ++ build_tag ++ "\""
in
text "Perhaps you haven't installed the " <> text build <>
text " libraries for package " <> quotes (ppr pkg) <> char '?' $$
tried_these files
| otherwise
= text "There are files missing in the " <> quotes (ppr pkg) <>
text " package," $$
text "try running 'ghc-pkg check'." $$
tried_these files
tried_these files
| null files = Outputable.empty
| verbosity dflags < 3 =
text "Use -v to see a list of the files searched for."
| otherwise =
hang (text "Locations searched:") 2 $ vcat (map text files)
pkg_hidden :: UnitId -> SDoc
pkg_hidden pkgid =
text "It is a member of the hidden package"
<+> quotes (ppr pkgid)
--FIXME: we don't really want to show the unit id here we should
-- show the source package id or installed package id if it's ambiguous
<> dot $$ cabal_pkg_hidden_hint pkgid
cabal_pkg_hidden_hint pkgid
| gopt Opt_BuildingCabalPackage dflags
= let pkg = expectJust "pkg_hidden" (lookupPackage dflags pkgid)
in text "Perhaps you need to add" <+>
quotes (ppr (packageName pkg)) <+>
text "to the build-depends in your .cabal file."
| otherwise = Outputable.empty
mod_hidden pkg =
text "it is a hidden module in the package" <+> quotes (ppr pkg)
pp_suggestions :: [ModuleSuggestion] -> SDoc
pp_suggestions sugs
| null sugs = Outputable.empty
| otherwise = hang (text "Perhaps you meant")
2 (vcat (map pp_sugg sugs))
-- NB: Prefer the *original* location, and then reexports, and then
-- package flags when making suggestions. ToDo: if the original package
-- also has a reexport, prefer that one
pp_sugg (SuggestVisible m mod o) = ppr m <+> provenance o
where provenance ModHidden = Outputable.empty
provenance (ModOrigin{ fromOrigPackage = e,
fromExposedReexport = res,
fromPackageFlag = f })
| Just True <- e
= parens (text "from" <+> ppr (moduleUnitId mod))
| f && moduleName mod == m
= parens (text "from" <+> ppr (moduleUnitId mod))
| (pkg:_) <- res
= parens (text "from" <+> ppr (packageConfigId pkg)
<> comma <+> text "reexporting" <+> ppr mod)
| f
= parens (text "defined via package flags to be"
<+> ppr mod)
| otherwise = Outputable.empty
pp_sugg (SuggestHidden m mod o) = ppr m <+> provenance o
where provenance ModHidden = Outputable.empty
provenance (ModOrigin{ fromOrigPackage = e,
fromHiddenReexport = rhs })
| Just False <- e
= parens (text "needs flag -package-key"
<+> ppr (moduleUnitId mod))
| (pkg:_) <- rhs
= parens (text "needs flag -package-id"
<+> ppr (packageConfigId pkg))
| otherwise = Outputable.empty
cantFindInstalledErr :: LitString -> LitString -> DynFlags -> ModuleName -> InstalledFindResult
-> SDoc
cantFindInstalledErr cannot_find _ dflags mod_name find_result
= ptext cannot_find <+> quotes (ppr mod_name)
$$ more_info
where
more_info
= case find_result of
InstalledNoPackage pkg
-> text "no unit id matching" <+> quotes (ppr pkg) <+>
text "was found" $$ looks_like_srcpkgid pkg
InstalledNotFound files mb_pkg
| Just pkg <- mb_pkg, not (pkg `installedUnitIdEq` thisPackage dflags)
-> not_found_in_package pkg files
| null files
-> text "It is not a module in the current program, or in any known package."
| otherwise
-> tried_these files
_ -> panic "cantFindInstalledErr"
build_tag = buildTag dflags
looks_like_srcpkgid :: InstalledUnitId -> SDoc
looks_like_srcpkgid pk
-- Unsafely coerce a unit id FastString into a source package ID
-- FastString and see if it means anything.
| (pkg:pkgs) <- searchPackageId dflags (SourcePackageId (installedUnitIdFS pk))
= parens (text "This unit ID looks like the source package ID;" $$
text "the real unit ID is" <+> quotes (ftext (installedUnitIdFS (unitId pkg))) $$
(if null pkgs then Outputable.empty
else text "and" <+> int (length pkgs) <+> text "other candidates"))
-- Todo: also check if it looks like a package name!
| otherwise = Outputable.empty
not_found_in_package pkg files
| build_tag /= ""
= let
build = if build_tag == "p" then "profiling"
else "\"" ++ build_tag ++ "\""
in
text "Perhaps you haven't installed the " <> text build <>
text " libraries for package " <> quotes (ppr pkg) <> char '?' $$
tried_these files
| otherwise
= text "There are files missing in the " <> quotes (ppr pkg) <>
text " package," $$
text "try running 'ghc-pkg check'." $$
tried_these files
tried_these files
| null files = Outputable.empty
| verbosity dflags < 3 =
text "Use -v to see a list of the files searched for."
| otherwise =
hang (text "Locations searched:") 2 $ vcat (map text files)