Modules.hs 13.1 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
{- |
    Module      :  $Header$
    Description :  Compilation of a single module
    Copyright   :  (c) 1999-2004, Wolfgang Lux
                       2005, Martin Engelke (men@informatik.uni-kiel.de)
                       2007, Sebastian Fischer (sebf@informatik.uni-kiel.de)
                       2011, Björn Peemöller (bjp@informatik.uni-kiel.de)
    License     :  OtherLicense

    Maintainer  :  bjp@informatik.uni-kiel.de
    Stability   :  experimental
    Portability :  portable

    This module controls the compilation of modules.
-}

module Modules
18
  ( compileModule, loadModule, checkModuleHeader, checkModule, writeOutput
19
20
  ) where

21
import Control.Monad (unless, when)
22
import Data.Maybe (fromMaybe)
23
import Text.PrettyPrint
24
25
26
27
28
29
30
31

import Curry.Base.MessageMonad
import Curry.Base.Position
import Curry.Base.Ident
import Curry.ExtendedFlat.InterfaceEquality (eqInterface)
import Curry.Files.Filenames
import Curry.Files.PathUtils

32
import Base.Messages (abortWith, abortWithMessages, putErrsLn)
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

import Env.Eval (evalEnv)

-- source representations
import qualified Curry.AbstractCurry as AC
import qualified Curry.ExtendedFlat.Type as EF
import qualified Curry.Syntax as CS
import qualified IL as IL

import Checks
import CompilerEnv
import CompilerOpts
import Exports
import Generators
import Imports
import Interfaces
import ModuleSummary
import Transformations

-- The function 'compileModule' is the main entry-point of this
-- module for compiling a Curry source module. Depending on the command
-- line options it will emit either C code or FlatCurry code (standard
-- or in XML
-- representation) or AbstractCurry code (typed, untyped or with type
-- signatures) for the module. Usually the first step is to
-- check the module. Then the code is translated into the intermediate
-- language. If necessary, this phase will also update the module's
-- interface file. The resulting code then is either written out (in
-- FlatCurry or XML format) or translated further into C code.
-- The untyped  AbstractCurry representation is written
-- out directly after parsing and simple checking the source file.
-- The typed AbstractCurry code is written out after checking the module.
65
--
66
67
68
-- The compiler automatically loads the prelude when compiling any
-- module, except for the prelude itself, by adding an appropriate import
-- declaration to the module.
69
--
70
71
72
73
74
75
76
-- Since this modified version of the Muenster Curry Compiler is used
-- as a frontend for PAKCS, all functions for evaluating goals and generating
-- C code are obsolete and commented out.

compileModule :: Options -> FilePath -> IO ()
compileModule opts fn = do
  loaded <- loadModule opts fn
77
  case checkModule opts loaded of
78
    CheckFailed errs -> abortWithMessages errs
79
80
81
82
    CheckSuccess (env, mdl, dumps) -> do
      showWarnings opts $ warnCheck env mdl
      mapM_ (doDump opts) dumps
      writeOutput opts fn (env, mdl)
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101

writeOutput :: Options -> FilePath -> (CompilerEnv, CS.Module) -> IO ()
writeOutput opts fn (env, modul) = do
  writeParsed        opts fn     modul
  writeAbstractCurry opts fn env modul
  when withFlat $ do
    -- checkModule checks types, and then transModule introduces new
    -- functions (by lambda lifting in 'desugar'). Consequence: The
    -- types of the newly introduced functions are not inferred (hsi)
    let (env2, il, dumps) = transModule opts env modul
    -- dump intermediate results
    mapM_ (doDump opts) dumps
    -- generate target code
    let intf = exportInterface env2 modul
    let modSum = summarizeModule (tyConsEnv env2) intf modul
    writeFlat opts fn env2 modSum il
  where
  withFlat = any (`elem` optTargetTypes opts)
              [FlatCurry, FlatXml, ExtendedFlatCurry]
102
103
104
105
106
107
108

-- ---------------------------------------------------------------------------
-- Loading a module
-- ---------------------------------------------------------------------------

loadModule :: Options -> FilePath -> IO (CompilerEnv, CS.Module)
loadModule opts fn = do
109
110
111
  -- read module
  mbSrc <- readModule fn
  case mbSrc of
112
    Nothing  -> abortWith ["missing file: " ++ fn] -- TODO
113
114
    Just src -> do
      -- parse module
115
      let parsed = ok $ CS.parseModule True fn src -- TODO
116
117
      -- check module header
      let (mdl, hdrErrs) = checkModuleHeader opts fn parsed
118
      unless (null hdrErrs) $ abortWithMessages hdrErrs -- TODO
119
120
      -- load the imported interfaces into an InterfaceEnv
      (iEnv, intfErrs) <- loadInterfaces (optImportPaths opts) mdl
121
      unless (null intfErrs) $ abortWithMessages intfErrs -- TODO
122
      -- add information of imported modules
123
124
      let (env, impErrs) = importModules opts mdl iEnv
      unless (null impErrs) $ abortWithMessages impErrs -- TODO
125
      return (env, mdl)
126

127
checkModuleHeader :: Options -> FilePath -> CS.Module -> (CS.Module, [Message])
128
checkModuleHeader opts fn = checkModuleId fn
129
                          . importPrelude opts fn
130
                          . CS.patchModuleId fn
131
132

-- |Check whether the 'ModuleIdent' and the 'FilePath' fit together
133
checkModuleId :: FilePath -> CS.Module -> (CS.Module, [Message])
134
checkModuleId fn m@(CS.Module mid _ _ _)
135
  | last (midQualifiers mid) == takeBaseName fn
136
137
138
139
140
141
142
143
144
  = (m, [])
  | otherwise
  = (m, [errModuleFileMismatch mid])

-- An implicit import of the prelude is added to the declarations of
-- every module, except for the prelude itself, or when the import is disabled
-- by a compiler option. If no explicit import for the prelude is present,
-- the prelude is imported unqualified, otherwise a qualified import is added.

145
146
importPrelude :: Options -> FilePath -> CS.Module -> CS.Module
importPrelude opts fn m@(CS.Module mid es is ds)
147
148
149
150
151
152
153
154
155
    -- the Prelude itself
  | mid == preludeMIdent          = m
    -- disabled by compiler option
  | noImpPrelude                  = m
    -- already imported
  | preludeMIdent `elem` imported = m
    -- let's add it!
  | otherwise                     = CS.Module mid es (preludeImp : is) ds
  where
156
  noImpPrelude = NoImplicitPrelude `elem` optExtensions opts
157
  preludeImp   = CS.ImportDecl (first fn) preludeMIdent
158
159
160
161
                  False   -- qualified?
                  Nothing -- no alias
                  Nothing -- no selection of types, functions, etc.
  imported     = [imp | (CS.ImportDecl _ imp _ _ _) <- is]
162
163
164
165
166

-- ---------------------------------------------------------------------------
-- Checking a module
-- ---------------------------------------------------------------------------

167
-- TODO: The order of the checks should be improved!
168
169
170
-- TODO (2012-01-05, bjp): The export specification check for untyped
--   AbstractCurry is deactivated as it requires the value information
--   collected by the type checker.
171
checkModule :: Options -> (CompilerEnv, CS.Module)
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
            -> CheckResult (CompilerEnv, CS.Module, [Dump])
checkModule opts (env, mdl) = do
  (env1, kc) <- kindCheck env mdl -- should be only syntax checking ?
  (env2, sc) <- syntaxCheck opts env1 kc
  (env3, pc) <- precCheck        env2 sc
  (env4, tc) <- if withTypeCheck
                   then typeCheck env3 pc >>= uncurry exportCheck
                   else return (env3, pc)
  (env5, ql) <- return $ qual opts env4 tc
  let dumps = [ (DumpParsed       , env , CS.showModule mdl)
              , (DumpKindChecked  , env1, CS.showModule kc)
              , (DumpSyntaxChecked, env2, CS.showModule sc)
              , (DumpPrecChecked  , env3, CS.showModule pc)
              , (DumpTypeChecked  , env4, CS.showModule tc)
              , (DumpRenamed      , env5, CS.showModule ql)
              ]
  return (env5, ql, dumps)
189
  where
190
191
  withTypeCheck = any (`elem` optTargetTypes opts)
                      [FlatCurry, ExtendedFlatCurry, FlatXml, AbstractCurry]
192
193
194
195
196

-- ---------------------------------------------------------------------------
-- Translating a module
-- ---------------------------------------------------------------------------

197
198
type Dump = (DumpLevel, CompilerEnv, String)

199
200
-- |Translate FlatCurry into the intermediate language 'IL'
transModule :: Options -> CompilerEnv -> CS.Module
201
            -> (CompilerEnv, IL.Module, [Dump])
202
203
transModule opts env mdl = (env5, ilCaseComp, dumps)
  where
204
205
206
207
208
209
210
  flat' = FlatCurry `elem` optTargetTypes opts
  env0 = env { evalAnnotEnv = evalEnv mdl }
  (desugared , env1) = desugar        mdl        env0
  (simplified, env2) = simplify flat' desugared  env1
  (lifted    , env3) = lift           simplified env2
  (il        , env4) = ilTrans flat'  lifted     env3
  (ilCaseComp, env5) = completeCase   il         env4
211
212
213
214
215
  dumps = [ (DumpDesugared    , env1, show $ CS.ppModule desugared )
          , (DumpSimplified   , env2, show $ CS.ppModule simplified)
          , (DumpLifted       , env3, show $ CS.ppModule lifted    )
          , (DumpTranslated   , env4, show $ IL.ppModule il        )
          , (DumpCaseCompleted, env5, show $ IL.ppModule ilCaseComp)
216
          ]
217
218
219
220
221
222
223
224
225

-- ---------------------------------------------------------------------------
-- Writing output
-- ---------------------------------------------------------------------------

-- The functions \texttt{genFlat} and \texttt{genAbstract} generate
-- flat and abstract curry representations depending on the specified option.
-- If the interface of a modified Curry module did not change, the
-- corresponding file name will be returned within the result of 'genFlat'
226
-- (depending on the compiler flag "force") and other modules importing this
227
228
229
230
231
232
233
-- module won't be dependent on it any longer.

-- |Output the parsed 'Module' on request
writeParsed :: Options -> FilePath -> CS.Module -> IO ()
writeParsed opts fn modul = when srcTarget $
  writeModule useSubDir targetFile source
  where
234
235
236
237
  srcTarget  = Parsed `elem` optTargetTypes opts
  useSubDir  = optUseSubdir opts
  targetFile = fromMaybe (sourceRepName fn) (optOutput opts)
  source     = CS.showModule modul
238

239
writeFlat :: Options -> FilePath -> CompilerEnv -> ModuleSummary -> IL.Module
240
241
          -> IO ()
writeFlat opts fn env modSum il = do
242
243
244
245
246
247
248
249
  when (extTarget || fcyTarget) $ do
    writeFlatCurry opts fn env modSum il
    writeInterface opts fn env modSum il
  when (xmlTarget) $ writeXML opts fn modSum il
  where
  extTarget    = ExtendedFlatCurry `elem` optTargetTypes opts
  fcyTarget    = FlatCurry         `elem` optTargetTypes opts
  xmlTarget    = FlatXml           `elem` optTargetTypes opts
250
251
252
253
254

-- |Export an 'IL.Module' into a FlatCurry file
writeFlatCurry :: Options -> FilePath -> CompilerEnv -> ModuleSummary
               -> IL.Module -> IO ()
writeFlatCurry opts fn env modSum il = do
255
  showWarnings opts msgs
256
  when extTarget $ EF.writeExtendedFlat useSubDir (extFlatName fn) prog
257
  when fcyTarget $ EF.writeFlatCurry    useSubDir (flatName    fn) prog
258
  where
259
260
261
262
  extTarget    = ExtendedFlatCurry `elem` optTargetTypes opts
  fcyTarget    = FlatCurry         `elem` optTargetTypes opts
  useSubDir    = optUseSubdir opts
  (prog, msgs) = genFlatCurry opts modSum env il
263

264
265
266
267
268
269
270
-- |Export an 'IL.Module' into an XML file
writeXML :: Options -> FilePath -> ModuleSummary -> IL.Module -> IO ()
writeXML opts fn modSum il = writeModule useSubDir (xmlName fn) curryXml
  where
  useSubDir = optUseSubdir opts
  curryXml  = shows (IL.xmlModule (interface modSum) (infixDecls modSum) il) "\n"

271
272
273
274
275
276
277
278
279
280
281
writeInterface :: Options -> FilePath -> CompilerEnv -> ModuleSummary
               -> IL.Module -> IO ()
writeInterface opts fn env modSum il
  | not (optInterface opts) = return ()
  | optForce opts           = outputInterface
  | otherwise               = do
      mfint <- EF.readFlatInterface targetFile
      let oldInterface = fromMaybe emptyIntf mfint
      when (mfint == mfint) $ return () -- necessary to close file -- TODO
      unless (oldInterface `eqInterface` newInterface) $ outputInterface
  where
282
283
284
285
286
287
  targetFile = flatIntName fn
  emptyIntf = EF.Prog "" [] [] [] []
  (newInterface, intMsgs) = genFlatInterface opts modSum env il
  outputInterface = do
    showWarnings opts intMsgs
    EF.writeFlatCurry (optUseSubdir opts) targetFile newInterface
288
289
290
291
292
293
294
295

writeAbstractCurry :: Options -> FilePath -> CompilerEnv -> CS.Module -> IO ()
writeAbstractCurry opts fname env modul = do
  when  acyTarget $ AC.writeCurry useSubDir (acyName fname)
                  $ genTypedAbstractCurry env modul
  when uacyTarget $ AC.writeCurry useSubDir (uacyName fname)
                  $ genUntypedAbstractCurry env modul
  where
296
297
298
  acyTarget  = AbstractCurry        `elem` optTargetTypes opts
  uacyTarget = UntypedAbstractCurry `elem` optTargetTypes opts
  useSubDir  = optUseSubdir opts
299
300
301
302
303

showWarnings :: Options -> [Message] -> IO ()
showWarnings opts msgs = when (optWarn opts)
                       $ putErrsLn $ map showWarning msgs

304
-- |The 'dump' function writes the selected information to standard output.
Björn Peemöller 's avatar
Björn Peemöller committed
305
306
doDump :: Options -> Dump -> IO ()
doDump opts (level, env, dump) = when (level `elem` optDumps opts) $ do
307
308
  when (optDumpEnv opts) $ putStrLn $ showCompilerEnv env
  putStrLn $ unlines [header, replicate (length header) '=', dump]
309
310
311
312
313
314
  where
  header = lookupHeader dumpLevel
  lookupHeader []            = "Unknown dump level " ++ show level
  lookupHeader ((l,_,h):lhs)
    | level == l = h
    | otherwise  = lookupHeader lhs
315

316
errModuleFileMismatch :: ModuleIdent -> Message
317
318
319
errModuleFileMismatch mid = posMessage mid $ hsep $ map text
  [ "Module", moduleName mid, "must be in a file"
  , moduleName mid ++ ".(l)curry" ]