\begin{code}
module Finder (
flushFinderCache, -- :: IO ()
-
- findModule, -- :: ModuleName
- -- -> IO (Either [FilePath] (Module, ModLocation))
-
- findPackageModule, -- :: ModuleName
- -- -> IO (Either [FilePath] (Module, ModLocation))
-
- mkHomeModLocation, -- :: ModuleName -> FilePath -> IO ModLocation
-
- findLinkable, -- :: ModuleName -> ModLocation -> IO (Maybe Linkable)
-
- hiBootExt, -- :: String
- hiBootVerExt, -- :: String
-
+ FindResult(..),
+ findModule, -- :: ModuleName -> Bool -> IO FindResult
+ findPackageModule, -- :: ModuleName -> Bool -> IO FindResult
+ mkHomeModLocation, -- :: ModuleName -> FilePath -> IO ModLocation
+ mkHomeModLocation2, -- :: ModuleName -> FilePath -> String -> IO ModLocation
+ addHomeModuleToFinder, -- :: HscEnv -> Module -> ModLocation -> IO ()
+ uncacheModule, -- :: HscEnv -> Module -> IO ()
+ mkStubPaths,
+
+ findObjectLinkableMaybe,
+ findObjectLinkable,
+
+ cantFindError, -- :: DynFlags -> Module -> FindResult -> SDoc
) where
#include "HsVersions.h"
import Module
-import UniqFM ( filterUFM )
-import HscTypes ( Linkable(..), Unlinked(..) )
-import DriverState
-import DriverUtil
+import UniqFM ( filterUFM, delFromUFM )
+import HscTypes
+import Packages
import FastString
-import Config
import Util
+import DynFlags ( DynFlags(..), isOneShot, GhcMode(..) )
+import Outputable
+import Maybes ( expectJust )
import DATA_IOREF ( IORef, writeIORef, readIORef )
-import List
-import Directory
-import IO
-import Monad
+import Data.List
+import System.Directory
+import System.IO
+import Control.Monad
+import Data.Maybe ( isNothing )
+import Time ( ClockTime )
+
+
+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 knows (a) whether the module lives
--- in the home package or in another package, so it can make a Module
--- from a ModuleName, and (b) where the source, interface, and object
--- files for a module live.
---
--- It does *not* know which particular package a module lives in, because
--- that information is only contained in the interface file.
+-- 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
-GLOBAL_VAR(finder_cache, emptyModuleEnv, ModuleEnv (Module,ModLocation))
-
-- remove all the home modules from the cache; package modules are
-- assumed to not move around during a session.
-flushFinderCache :: IO ()
-flushFinderCache = do
+flushFinderCache :: IORef FinderCache -> IO ()
+flushFinderCache finder_cache = do
+ fm <- readIORef finder_cache
+ writeIORef finder_cache $! filterUFM (\(loc,m) -> isNothing m) fm
+
+addToFinderCache :: IORef FinderCache -> Module -> FinderCacheEntry -> IO ()
+addToFinderCache finder_cache mod_name entry = do
fm <- readIORef finder_cache
- writeIORef finder_cache (filterUFM (not . isHomeModule . fst) fm)
+ writeIORef finder_cache $! extendModuleEnv fm mod_name entry
-addToFinderCache :: ModuleName -> (Module,ModLocation) -> IO ()
-addToFinderCache mod_name stuff = do
+removeFromFinderCache :: IORef FinderCache -> Module -> IO ()
+removeFromFinderCache finder_cache mod_name = do
fm <- readIORef finder_cache
- writeIORef finder_cache (extendModuleEnvByName fm mod_name stuff)
+ writeIORef finder_cache $! delFromUFM fm mod_name
-lookupFinderCache :: ModuleName -> IO (Maybe (Module,ModLocation))
-lookupFinderCache mod_name = do
+lookupFinderCache :: IORef FinderCache -> Module -> IO (Maybe FinderCacheEntry)
+lookupFinderCache finder_cache mod_name = do
fm <- readIORef finder_cache
- return $! lookupModuleEnvByName fm mod_name
+ return $! lookupModuleEnv fm mod_name
-- -----------------------------------------------------------------------------
--- Locating modules
+-- The two external entry points
-- This is the main interface to the finder, which maps ModuleNames to
-- Modules and ModLocations.
-- The ModLocation contains the names of all the files associated with
-- that module: its source file, .hi file, object file, etc.
-findModule :: ModuleName -> IO (Either [FilePath] (Module, ModLocation))
-findModule name = do
- r <- lookupFinderCache name
- case r of
- Just result -> return (Right result)
- Nothing -> do
- j <- maybeHomeModule name
- case j of
- Right home_module -> return (Right home_module)
- Left home_files -> do
- r <- findPackageMod name
- case r of
- Right pkg_module -> return (Right pkg_module)
- Left pkg_files -> return (Left (home_files ++ pkg_files))
-
-findPackageModule :: ModuleName -> IO (Either [FilePath] (Module, ModLocation))
-findPackageModule name = do
- r <- lookupFinderCache name
- case r of
- Just result -> return (Right result)
- Nothing -> findPackageMod name
-
-hiBootExt = "hi-boot"
-hiBootVerExt = "hi-boot-" ++ cHscIfaceFileVersion
-
-maybeHomeModule :: ModuleName -> IO (Either [FilePath] (Module, ModLocation))
-maybeHomeModule mod_name = do
- home_path <- readIORef v_Import_paths
- hisuf <- readIORef v_Hi_suf
- mode <- readIORef v_GhcMode
+data FindResult
+ = Found ModLocation PackageIdH
+ -- the module was found
+ | FoundMultiple [PackageId]
+ -- *error*: both in multiple packages
+ | PackageHidden PackageId
+ -- for an explicit source import: the package containing the module is
+ -- not exposed.
+ | ModuleHidden PackageId
+ -- for an explicit source import: the package containing the module is
+ -- exposed, but the module itself is hidden.
+ | NotFound [FilePath]
+ -- the module was not found, the specified places were searched.
+
+findModule :: HscEnv -> Module -> Bool -> IO FindResult
+findModule = findModule' True
+
+findPackageModule :: HscEnv -> Module -> Bool -> IO FindResult
+findPackageModule = findModule' False
+
+
+data LocalFindResult
+ = Ok FinderCacheEntry
+ | CantFindAmongst [FilePath]
+ | MultiplePackages [PackageId]
+
+findModule' :: Bool -> HscEnv -> Module -> Bool -> IO FindResult
+findModule' home_allowed hsc_env name explicit
+ = do -- First try the cache
+ mb_entry <- lookupFinderCache cache name
+ case mb_entry of
+ Just old_entry -> return $! found old_entry
+ Nothing -> not_cached
+
+ where
+ cache = hsc_FC hsc_env
+ dflags = hsc_dflags hsc_env
+
+ -- We've found the module, so the remaining question is
+ -- whether it's visible or not
+ found :: FinderCacheEntry -> FindResult
+ found (loc, Nothing)
+ | home_allowed = Found loc HomePackage
+ | otherwise = NotFound []
+ found (loc, Just (pkg, exposed_mod))
+ | explicit && not exposed_mod = ModuleHidden pkg_name
+ | explicit && not (exposed pkg) = PackageHidden pkg_name
+ | otherwise =
+ Found loc (ExtPackage (mkPackageId (package pkg)))
+ where
+ pkg_name = packageConfigId pkg
+
+ found_new entry = do
+ addToFinderCache cache name entry
+ return $! found entry
+
+ not_cached
+ | not home_allowed = do
+ j <- findPackageModule' dflags name
+ case j of
+ Ok entry -> found_new entry
+ MultiplePackages pkgs -> return (FoundMultiple pkgs)
+ CantFindAmongst paths -> return (NotFound paths)
+
+ | otherwise = do
+ j <- findHomeModule' dflags name
+ case j of
+ Ok entry -> found_new entry
+ MultiplePackages pkgs -> return (FoundMultiple pkgs)
+ CantFindAmongst home_files -> do
+ r <- findPackageModule' dflags name
+ case r of
+ CantFindAmongst pkg_files ->
+ return (NotFound (home_files ++ pkg_files))
+ MultiplePackages pkgs ->
+ return (FoundMultiple pkgs)
+ Ok entry ->
+ found_new entry
+
+addHomeModuleToFinder :: HscEnv -> Module -> ModLocation -> IO ()
+addHomeModuleToFinder hsc_env mod loc
+ = addToFinderCache (hsc_FC hsc_env) mod (loc, Nothing)
+
+uncacheModule :: HscEnv -> Module -> IO ()
+uncacheModule hsc_env mod = removeFromFinderCache (hsc_FC hsc_env) mod
+
+-- -----------------------------------------------------------------------------
+-- The internal workers
+
+findHomeModule' :: DynFlags -> Module -> IO LocalFindResult
+findHomeModule' dflags mod = do
+ let home_path = importPaths dflags
+ hisuf = hiSuf dflags
let
source_exts =
- [ ("hs", mkHomeModLocationSearched mod_name)
- , ("lhs", mkHomeModLocationSearched mod_name)
+ [ ("hs", mkHomeModLocationSearched dflags mod "hs")
+ , ("lhs", mkHomeModLocationSearched dflags mod "lhs")
]
- hi_exts = [ (hisuf, mkHiOnlyModLocation hisuf mod_name) ]
+ hi_exts = [ (hisuf, mkHiOnlyModLocation dflags hisuf)
+ , (addBootSuffix hisuf, mkHiOnlyModLocation dflags hisuf)
+ ]
- boot_exts =
- [ (hiBootVerExt, mkHiOnlyModLocation hisuf mod_name)
- , (hiBootExt, mkHiOnlyModLocation hisuf mod_name)
- ]
-
-- 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.
- --
- -- When generating dependencies, we're interested in either category.
- --
- exts
- | mode == DoMkDependHS = hi_exts ++ source_exts ++ boot_exts
- | isCompManagerMode mode = source_exts
- | otherwise {-one-shot-} = hi_exts ++ boot_exts
-
- searchPathExts home_path mod_name exts
-
--- -----------------------------------------------------------------------------
--- Looking for a package module
-
-findPackageMod :: ModuleName -> IO (Either [FilePath] (Module, ModLocation))
-findPackageMod mod_name = do
- mode <- readIORef v_GhcMode
- imp_dirs <- getPackageImportPath -- including the 'auto' ones
-
- -- hi-suffix for packages depends on the build tag.
- package_hisuf <-
- do tag <- readIORef v_Build_tag
- if null tag
- then return "hi"
- else return (tag ++ "_hi")
+ exts | isOneShot (ghcMode dflags) = hi_exts
+ | otherwise = source_exts
+ searchPathExts home_path mod exts
+
+findPackageModule' :: DynFlags -> Module -> IO LocalFindResult
+findPackageModule' dflags mod
+ = case lookupModuleInAllPackages dflags mod of
+ [] -> return (CantFindAmongst [])
+ [pkg_info] -> findPackageIface dflags mod pkg_info
+ many -> return (MultiplePackages (map (mkPackageId.package.fst) many))
+
+findPackageIface :: DynFlags -> Module -> (PackageConfig,Bool) -> IO LocalFindResult
+findPackageIface dflags mod pkg_info@(pkg_conf, _) = do
let
+ tag = buildTag dflags
+
+ -- hi-suffix for packages depends on the build tag.
+ package_hisuf | null tag = "hi"
+ | otherwise = tag ++ "_hi"
hi_exts =
- [ (package_hisuf, mkPackageModLocation package_hisuf mod_name) ]
+ [ (package_hisuf,
+ mkPackageModLocation dflags pkg_info package_hisuf) ]
source_exts =
- [ ("hs", mkPackageModLocation package_hisuf mod_name)
- , ("lhs", mkPackageModLocation package_hisuf mod_name)
+ [ ("hs", mkPackageModLocation dflags pkg_info package_hisuf)
+ , ("lhs", mkPackageModLocation dflags pkg_info package_hisuf)
]
-
+
-- mkdependHS needs to look for source files in packages too, so
-- that we can make dependencies between package before they have
-- been built.
exts
- | mode == DoMkDependHS = hi_exts ++ source_exts
- | otherwise = hi_exts
-
+ | MkDepend <- ghcMode dflags = hi_exts ++ source_exts
+ | otherwise = hi_exts
-- we never look for a .hi-boot file in an external package;
-- .hi-boot files only make sense for the home package.
- searchPathExts imp_dirs mod_name exts
+
+ searchPathExts (importDirs pkg_conf) mod exts
-- -----------------------------------------------------------------------------
-- General path searching
searchPathExts
:: [FilePath] -- paths to search
- -> ModuleName -- module name
+ -> Module -- module name
-> [ (
- String, -- suffix
- String -> String -> String -> IO (Module, ModLocation) -- action
+ FileExt, -- suffix
+ FilePath -> BaseName -> IO FinderCacheEntry -- action
)
]
- -> IO (Either [FilePath] (Module, ModLocation))
+ -> IO LocalFindResult
+
+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
-searchPathExts path mod_name exts = search to_search
where
- basename = dots_to_slashes (moduleNameUserString mod_name)
+ basename = dots_to_slashes (moduleString mod)
- to_search :: [(FilePath, IO (Module,ModLocation))]
- to_search = [ (file, fn p basename ext)
- | p <- path,
+ to_search :: [(FilePath, IO FinderCacheEntry)]
+ to_search = [ (file, fn path basename)
+ | path <- paths,
(ext,fn) <- exts,
- let base | p == "." = basename
- | otherwise = p ++ '/':basename
- file = base ++ '.':ext
+ let base | path == "." = basename
+ | otherwise = path `joinFileName` basename
+ file = base `joinFileExt` ext
]
- search [] = return (Left (map fst to_search))
- search ((file, result) : rest) = do
+ search [] = return (CantFindAmongst (map fst to_search))
+ search ((file, mk_result) : rest) = do
b <- doesFileExist file
if b
- then Right `liftM` result
+ then do { res <- mk_result; return (Ok res) }
else search rest
--- -----------------------------------------------------------------------------
--- Building ModLocations
-
-mkHiOnlyModLocation hisuf mod_name path basename _ext = do
- -- basename == dots_to_slashes (moduleNameUserString mod_name)
- loc <- hiOnlyModLocation path basename hisuf
- let result = (mkHomeModule mod_name, loc)
- addToFinderCache mod_name result
- return result
-
-mkPackageModLocation hisuf mod_name path basename _ext = do
- -- basename == dots_to_slashes (moduleNameUserString mod_name)
- loc <- hiOnlyModLocation path basename hisuf
- let result = (mkPackageModule mod_name, loc)
- addToFinderCache mod_name result
- return result
-
-hiOnlyModLocation path basename hisuf
- = do { obj_fn <- mkObjPath path basename ;
- return (ModLocation{ ml_hspp_file = Nothing,
- ml_hs_file = Nothing,
- ml_hi_file = path ++ '/':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
- })}
+mkHomeModLocationSearched :: DynFlags -> Module -> FileExt
+ -> FilePath -> BaseName -> IO FinderCacheEntry
+mkHomeModLocationSearched dflags mod suff path basename = do
+ loc <- mkHomeModLocation2 dflags mod (path `joinFileName` basename) suff
+ return (loc, Nothing)
+
+mkHiOnlyModLocation :: DynFlags -> FileExt -> FilePath -> BaseName
+ -> IO FinderCacheEntry
+mkHiOnlyModLocation dflags hisuf path basename = do
+ loc <- hiOnlyModLocation dflags path basename hisuf
+ return (loc, Nothing)
+
+mkPackageModLocation :: DynFlags -> (PackageConfig, Bool) -> FileExt
+ -> FilePath -> BaseName -> IO FinderCacheEntry
+mkPackageModLocation dflags pkg_info hisuf path basename = do
+ loc <- hiOnlyModLocation dflags path basename hisuf
+ return (loc, Just pkg_info)
-- -----------------------------------------------------------------------------
-- Constructing a home module location
--
-- Parameters are:
--
--- mod_name
+-- mod
-- The name of the module
--
-- path
-- (b) and (c): "."
--
-- src_basename
--- (a): dots_to_slashes (moduleNameUserString mod_name)
+-- (a): dots_to_slashes (moduleNameUserString 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 mod_name src_filename = do
- let mod_basename = dots_to_slashes (moduleNameUserString mod_name)
- (basename,extension) = splitFilename src_filename
-
- case my_prefix_match (reverse mod_basename) (reverse basename) of
- Just "" ->
- mkHomeModLocationSearched mod_name "." mod_basename extension
- Just rest -> do
- let path = reverse (dropWhile (=='/') rest)
- mkHomeModLocationSearched mod_name path mod_basename extension
- Nothing -> do
- -- hPutStrLn stderr ("Warning: " ++ src_filename ++
- -- ": filename and module name do not match")
- let (dir,basename,ext) = splitFilename3 src_filename
- mkHomeModLocationSearched mod_name dir basename ext
-
-mkHomeModLocationSearched mod_name path src_basename ext = do
- hisuf <- readIORef v_Hi_suf
- hidir <- readIORef v_Hi_dir
-
- let mod_basename = dots_to_slashes (moduleNameUserString mod_name)
-
- obj_fn <- mkObjPath path mod_basename
+mkHomeModLocation :: DynFlags -> Module -> FilePath -> IO ModLocation
+mkHomeModLocation dflags mod src_filename = do
+ let (basename,extension) = splitFilename src_filename
+ mkHomeModLocation2 dflags mod basename extension
+
+mkHomeModLocation2 :: DynFlags
+ -> Module
+ -> FilePath -- Of source module, without suffix
+ -> String -- Suffix
+ -> IO ModLocation
+mkHomeModLocation2 dflags mod src_basename ext = do
+ let mod_basename = dots_to_slashes (moduleString 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 `joinFileExt` ext),
+ ml_hi_file = hi_fn,
+ ml_obj_file = obj_fn })
+
+hiOnlyModLocation :: DynFlags -> FilePath -> String -> Suffix -> IO ModLocation
+hiOnlyModLocation dflags path basename hisuf
+ = do let full_basename = path `joinFileName` basename
+ obj_fn <- mkObjPath dflags full_basename basename
+ return ModLocation{ ml_hs_file = Nothing,
+ ml_hi_file = full_basename `joinFileExt` 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
+ -> IO FilePath
+mkObjPath dflags basename mod_basename
+ = do let
+ odir = objectDir dflags
+ osuf = objectSuf dflags
+
+ obj_basename | Just dir <- odir = dir `joinFileName` mod_basename
+ | otherwise = basename
+
+ return (obj_basename `joinFileExt` osuf)
+
+-- | 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
+ -> IO FilePath
+mkHiPath dflags basename mod_basename
+ = do let
+ hidir = hiDir dflags
+ hisuf = hiSuf dflags
+
+ hi_basename | Just dir <- hidir = dir `joinFileName` mod_basename
+ | otherwise = basename
+
+ return (hi_basename `joinFileExt` hisuf)
- let -- hi filename, always follows the module name
- hi_path | Just d <- hidir = d
- | otherwise = path
- hi_fn = hi_path ++ '/':mod_basename ++ '.':hisuf
+-- -----------------------------------------------------------------------------
+-- Filenames of the stub files
- -- source filename
- source_fn = path ++ '/':src_basename ++ '.':ext
+-- We don't have to store these in ModLocations, because they can be derived
+-- from other available information, and they're only rarely needed.
- result = ( mkHomeModule mod_name,
- ModLocation{ ml_hspp_file = Nothing,
- ml_hs_file = Just source_fn,
- ml_hi_file = hi_fn,
- ml_obj_file = obj_fn,
- })
+mkStubPaths
+ :: DynFlags
+ -> Module
+ -> ModLocation
+ -> (FilePath,FilePath)
- addToFinderCache mod_name result
- return result
+mkStubPaths dflags mod location
+ = let
+ stubdir = stubDir dflags
-mkObjPath :: FilePath -> String -> IO FilePath
--- Construct the filename of a .o file.
--- Does *not* check whether the .o file exists
-mkObjPath path basename
- = do odir <- readIORef v_Output_dir
- osuf <- readIORef v_Object_suf
+ mod_basename = dots_to_slashes (moduleString mod)
+ src_basename = basenameOf (expectJust "mkStubPaths"
+ (ml_hs_file location))
- let obj_path | Just d <- odir = d
- | otherwise = path
+ stub_basename0
+ | Just dir <- stubdir = dir `joinFileName` mod_basename
+ | otherwise = src_basename
- return (obj_path ++ '/':basename ++ '.':osuf)
+ stub_basename = stub_basename0 ++ "_stub"
+ in
+ (stub_basename `joinFileExt` "c",
+ stub_basename `joinFileExt` "h")
+ -- the _stub.o filename is derived from the ml_obj_file.
-- -----------------------------------------------------------------------------
-- findLinkable isn't related to the other stuff in here,
-- but there's no other obvious place for it
-findLinkable :: ModuleName -> ModLocation -> IO (Maybe Linkable)
-findLinkable mod locn
+findObjectLinkableMaybe :: Module -> ModLocation -> IO (Maybe Linkable)
+findObjectLinkableMaybe mod locn
= do let obj_fn = ml_obj_file locn
- obj_exist <- doesFileExist obj_fn
- if not obj_exist
- then return Nothing
- else
- do let stub_fn = case splitFilename3 obj_fn of
- (dir, base, ext) -> dir ++ "/" ++ base ++ "_stub.o"
- stub_exist <- doesFileExist stub_fn
- obj_time <- getModificationTime obj_fn
- if stub_exist
- then return (Just (LM obj_time mod [DotO obj_fn, DotO stub_fn]))
- else return (Just (LM obj_time mod [DotO obj_fn]))
+ 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 -> ClockTime -> IO Linkable
+findObjectLinkable mod obj_fn obj_time = do
+ let stub_fn = case splitFilename3 obj_fn of
+ (dir, base, ext) -> dir ++ "/" ++ base ++ "_stub.o"
+ stub_exist <- doesFileExist stub_fn
+ if stub_exist
+ then return (LM obj_time mod [DotO obj_fn, DotO stub_fn])
+ else return (LM obj_time mod [DotO obj_fn])
-- -----------------------------------------------------------------------------
-- Utils
dots_to_slashes = map (\c -> if c == '.' then '/' else c)
+
+-- -----------------------------------------------------------------------------
+-- Error messages
+
+cantFindError :: DynFlags -> Module -> FindResult -> SDoc
+cantFindError dflags mod_name (FoundMultiple pkgs)
+ = hang (ptext SLIT("Cannot import") <+> quotes (ppr mod_name) <> colon) 2 (
+ sep [ptext SLIT("it was found in multiple packages:"),
+ hsep (map (text.packageIdString) pkgs)]
+ )
+cantFindError dflags mod_name find_result
+ = hang (ptext SLIT("Could not find module") <+> quotes (ppr mod_name) <> colon)
+ 2 more_info
+ where
+ more_info
+ = case find_result of
+ PackageHidden pkg
+ -> ptext SLIT("it is a member of package") <+> ppr pkg <> comma
+ <+> ptext SLIT("which is hidden")
+
+ ModuleHidden pkg
+ -> ptext SLIT("it is hidden") <+> parens (ptext SLIT("in package")
+ <+> ppr pkg)
+
+ NotFound files
+ | null files
+ -> ptext SLIT("it is not a module in the current program, or in any known package.")
+ | verbosity dflags < 3
+ -> ptext SLIT("use -v to see a list of the files searched for")
+ | otherwise
+ -> hang (ptext SLIT("locations searched:"))
+ 2 (vcat (map text files))
+
+ _ -> panic "cantFindErr"
\end{code}
projects / ghc-hetmet.git / blobdiff