2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
4 \section[CodeGen]{@CodeGen@: main module of the code generator}
6 This module says how things get going at the top level.
8 @codeGen@ is the interface to the outside world. The \tr{cgTop*}
9 functions drive the mangling of top-level bindings.
11 %************************************************************************
13 \subsection[codeGen-outside-interface]{The code generator's offering to the world}
15 %************************************************************************
18 module CodeGen ( codeGen ) where
20 #include "HsVersions.h"
26 import AbsCUtils ( mkAbstractCs, mkAbsCStmts )
27 import Bag ( foldBag )
28 import CgBindery ( CgIdInfo )
29 import CgClosure ( cgTopRhsClosure )
30 import CgCon ( cgTopRhsCon )
31 import CgConTbls ( genStaticConBits )
32 import ClosureInfo ( mkClosureLFInfo )
33 import CmdLineOpts ( opt_SccProfilingOn, opt_EnsureSplittableC,
36 import CostCentre ( CostCentre )
37 import CStrings ( modnameToC )
38 import FiniteMap ( FiniteMap )
40 import Maybes ( maybeToBool )
41 import Name ( Module )
42 import PrimRep ( getPrimRepSize, PrimRep(..) )
44 import TyCon ( TyCon )
45 import Util ( panic, assertPanic )
49 codeGen :: FAST_STRING -- module name
50 -> ([CostCentre], -- local cost-centres needing declaring/registering
51 [CostCentre]) -- "extern" cost-centres needing declaring
52 -> [Module] -- import names
53 -> [TyCon] -- tycons with data constructors to convert
54 -> FiniteMap TyCon [(Bool, [Maybe Type])]
55 -- tycon specialisation info
56 -> [StgBinding] -- bindings to convert
57 -> AbstractC -- output
59 codeGen mod_name (local_CCs, extern_CCs) import_names gen_tycons tycon_specs stg_pgm
61 doing_profiling = opt_SccProfilingOn
62 maybe_split = if opt_EnsureSplittableC then CSplitMarker else AbsCNop
63 cinfo = MkCompInfo mod_name
65 if not doing_profiling then
67 genStaticConBits cinfo gen_tycons tycon_specs,
68 initC cinfo (cgTopBindings maybe_split stg_pgm) ]
70 else -- yes, cost-centre profiling:
71 -- Besides the usual stuff, we must produce:
73 -- * Declarations for the cost-centres defined in this module;
74 -- * Code to participate in "registering" all the cost-centres
75 -- in the program (done at startup time when the pgm is run).
77 -- (The local cost-centres involved in this are passed
78 -- into the code-generator, as are the imported-modules' names.)
82 mkAbstractCs [mkAbstractCs (map (CCostCentreDecl True) local_CCs),
83 mkAbstractCs (map (CCostCentreDecl False) extern_CCs),
84 mkCcRegister local_CCs import_names],
85 genStaticConBits cinfo gen_tycons tycon_specs,
86 initC cinfo (cgTopBindings maybe_split stg_pgm) ]
89 grp_name = case opt_SccGroup of
91 Nothing -> mod_name -- default: module name
94 mkCcRegister ccs import_names
96 register_ccs = mkAbstractCs (map mk_register ccs)
98 = foldr (mkAbsCStmts . mk_import_register) AbsCNop import_names
101 CCallProfCCMacro SLIT("START_REGISTER_CCS") [CLitLit (modnameToC (SLIT("_reg") _APPEND_ mod_name)) AddrRep],
104 CCallProfCCMacro SLIT("END_REGISTER_CCS") []
108 = CCallProfCCMacro SLIT("REGISTER_CC") [mkCCostCentre cc]
110 mk_import_register import_name
111 = CCallProfCCMacro SLIT("REGISTER_IMPORT") [CLitLit (modnameToC (SLIT("_reg") _APPEND_ import_name)) AddrRep]
114 %************************************************************************
116 \subsection[codegen-top-bindings]{Converting top-level STG bindings}
118 %************************************************************************
120 @cgTopBindings@ is only used for top-level bindings, since they need
121 to be allocated statically (not in the heap) and need to be labelled.
122 No unboxed bindings can happen at top level.
124 In the code below, the static bindings are accumulated in the
125 @MkCgState@, and transferred into the ``statics'' slot by @forkStatics@.
126 This is so that we can write the top level processing in a compositional
127 style, with the increasing static environment being plumbed as a state
131 cgTopBindings :: AbstractC -> [StgBinding] -> Code
133 cgTopBindings split bindings = mapCs (cgTopBinding split) bindings
135 cgTopBinding :: AbstractC -> StgBinding -> Code
137 cgTopBinding split (StgNonRec name rhs)
139 cgTopRhs name rhs `thenFC` \ (name, info) ->
142 cgTopBinding split (StgRec pairs)
144 fixC (\ new_binds -> addBindsC new_binds `thenC`
145 mapFCs ( \ (b,e) -> cgTopRhs b e ) pairs
146 ) `thenFC` \ new_binds ->
149 -- Urgh! I tried moving the forkStatics call from the rhss of cgTopRhs
150 -- to enclose the listFCs in cgTopBinding, but that tickled the
151 -- statics "error" call in initC. I DON'T UNDERSTAND WHY!
153 cgTopRhs :: Id -> StgRhs -> FCode (Id, CgIdInfo)
154 -- the Id is passed along for setting up a binding...
156 cgTopRhs name (StgRhsCon cc con args)
157 = forkStatics (cgTopRhsCon name con args (all zero_size args))
159 zero_size atom = getPrimRepSize (getArgPrimRep atom) == 0
161 cgTopRhs name (StgRhsClosure cc bi fvs upd_flag args body)
162 = ASSERT(null fvs) -- There should be no free variables
163 forkStatics (cgTopRhsClosure name cc bi args body lf_info)
165 lf_info = mkClosureLFInfo True{-top level-} [{-no fvs-}] upd_flag args