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|
module Vectorise.Env (
Scope(..),
-- * Local Environments
LocalEnv(..),
emptyLocalEnv,
-- * Global Environments
GlobalEnv(..),
initGlobalEnv,
extendImportedVarsEnv,
setFamEnv,
extendFamEnv,
extendTyConsEnv,
extendDataConsEnv,
extendPAFunsEnv,
setPRFunsEnv,
modVectInfo
) where
import HscTypes
import InstEnv
import FamInstEnv
import CoreSyn
import Type
import TyCon
import DataCon
import VarEnv
import VarSet
import Var
import NameSet
import Name
import NameEnv
import FastString
-- | Indicates what scope something (a variable) is in.
data Scope a b
= Global a
| Local b
-- LocalEnv -------------------------------------------------------------------
-- | The local environment.
data LocalEnv
= LocalEnv {
-- Mapping from local variables to their vectorised and lifted versions.
local_vars :: VarEnv (Var, Var)
-- In-scope type variables.
, local_tyvars :: [TyVar]
-- Mapping from tyvars to their PA dictionaries.
, local_tyvar_pa :: VarEnv CoreExpr
-- Local binding name.
, local_bind_name :: FastString
}
-- | Create an empty local environment.
emptyLocalEnv :: LocalEnv
emptyLocalEnv = LocalEnv {
local_vars = emptyVarEnv
, local_tyvars = []
, local_tyvar_pa = emptyVarEnv
, local_bind_name = fsLit "fn"
}
-- GlobalEnv ------------------------------------------------------------------
-- |The global environment: entities that exist at top-level.
--
data GlobalEnv
= GlobalEnv
{ global_vars :: VarEnv Var
-- ^Mapping from global variables to their vectorised versions — aka the /vectorisation
-- map/.
, global_vect_decls :: VarEnv (Type, CoreExpr)
-- ^Mapping from global variables that have a vectorisation declaration to the right-hand
-- side of that declaration and its type. This mapping only applies to non-scalar
-- vectorisation declarations. All variables with a scalar vectorisation declaration are
-- mentioned in 'global_scalars_vars'.
, global_scalar_vars :: VarSet
-- ^Purely scalar variables. Code which mentions only these variables doesn't have to be
-- lifted. This includes variables from the current module that have a scalar
-- vectorisation declaration and those that the vectoriser determines to be scalar.
, global_scalar_tycons :: NameSet
-- ^Type constructors whose values can only contain scalar data and that appear in a
-- 'VECTORISE SCALAR type' pragma in the current or an imported module. Scalar code may
-- only operate on such data.
, global_novect_vars :: VarSet
-- ^Variables that are not vectorised. (They may be referenced in the right-hand sides
-- of vectorisation declarations, though.)
, global_tycons :: NameEnv TyCon
-- ^Mapping from TyCons to their vectorised versions.
-- TyCons which do not have to be vectorised are mapped to themselves.
, global_datacons :: NameEnv DataCon
-- ^Mapping from DataCons to their vectorised versions.
, global_pa_funs :: NameEnv Var
-- ^Mapping from TyCons to their PA dfuns.
, global_pr_funs :: NameEnv Var
-- ^Mapping from TyCons to their PR dfuns.
, global_inst_env :: (InstEnv, InstEnv)
-- ^External package inst-env & home-package inst-env for class instances.
, global_fam_inst_env :: FamInstEnvs
-- ^External package inst-env & home-package inst-env for family instances.
, global_bindings :: [(Var, CoreExpr)]
-- ^Hoisted bindings.
}
-- |Create an initial global environment.
--
initGlobalEnv :: VectInfo -> [CoreVect] -> (InstEnv, InstEnv) -> FamInstEnvs -> GlobalEnv
initGlobalEnv info vectDecls instEnvs famInstEnvs
= GlobalEnv
{ global_vars = mapVarEnv snd $ vectInfoVar info
, global_vect_decls = mkVarEnv vects
, global_scalar_vars = vectInfoScalarVars info `extendVarSetList` scalar_vars
, global_scalar_tycons = vectInfoScalarTyCons info `addListToNameSet` scalar_tycons
, global_novect_vars = mkVarSet novects
, global_tycons = mapNameEnv snd $ vectInfoTyCon info
, global_datacons = mapNameEnv snd $ vectInfoDataCon info
, global_pa_funs = mapNameEnv snd $ vectInfoPADFun info
, global_pr_funs = emptyNameEnv
, global_inst_env = instEnvs
, global_fam_inst_env = famInstEnvs
, global_bindings = []
}
where
vects = [(var, (ty, exp)) | Vect var (Just exp@(Var rhs_var)) <- vectDecls
, let ty = varType rhs_var]
-- FIXME: we currently only allow RHSes consisting of a
-- single variable to be able to obtain the type without
-- inference — see also 'TcBinds.tcVect'
scalar_vars = [var | Vect var Nothing <- vectDecls]
novects = [var | NoVect var <- vectDecls]
scalar_tycons = [tyConName tycon | VectType tycon Nothing <- vectDecls]
-- Operators on Global Environments -------------------------------------------
-- |Extend the list of global variables in an environment.
--
extendImportedVarsEnv :: [(Var, Var)] -> GlobalEnv -> GlobalEnv
extendImportedVarsEnv ps genv
= genv { global_vars = extendVarEnvList (global_vars genv) ps }
-- |Set the list of type family instances in an environment.
--
setFamEnv :: FamInstEnv -> GlobalEnv -> GlobalEnv
setFamEnv l_fam_inst genv
= genv { global_fam_inst_env = (g_fam_inst, l_fam_inst) }
where (g_fam_inst, _) = global_fam_inst_env genv
-- |Extend the list of type family instances.
--
extendFamEnv :: [FamInst] -> GlobalEnv -> GlobalEnv
extendFamEnv new genv
= genv { global_fam_inst_env = (g_fam_inst, extendFamInstEnvList l_fam_inst new) }
where (g_fam_inst, l_fam_inst) = global_fam_inst_env genv
-- |Extend the list of type constructors in an environment.
--
extendTyConsEnv :: [(Name, TyCon)] -> GlobalEnv -> GlobalEnv
extendTyConsEnv ps genv
= genv { global_tycons = extendNameEnvList (global_tycons genv) ps }
-- |Extend the list of data constructors in an environment.
--
extendDataConsEnv :: [(Name, DataCon)] -> GlobalEnv -> GlobalEnv
extendDataConsEnv ps genv
= genv { global_datacons = extendNameEnvList (global_datacons genv) ps }
-- |Extend the list of PA functions in an environment.
--
extendPAFunsEnv :: [(Name, Var)] -> GlobalEnv -> GlobalEnv
extendPAFunsEnv ps genv
= genv { global_pa_funs = extendNameEnvList (global_pa_funs genv) ps }
-- |Set the list of PR functions in an environment.
--
setPRFunsEnv :: [(Name, Var)] -> GlobalEnv -> GlobalEnv
setPRFunsEnv ps genv
= genv { global_pr_funs = mkNameEnv ps }
-- |Compute vectorisation information that goes into 'ModGuts' (and is stored in interface files).
-- The incoming 'vectInfo' is that from the 'HscEnv' and 'EPS'. The outgoing one contains only the
-- declarations for the currently compiled module; this includes variables, type constructors, and
-- data constructors referenced in VECTORISE pragmas, even if they are defined in an imported
-- module.
--
modVectInfo :: GlobalEnv -> [TyCon] -> [CoreVect]-> VectInfo -> VectInfo
modVectInfo env tycons vectDecls info
= info
{ vectInfoVar = mk_env ids (global_vars env)
, vectInfoTyCon = mk_env tyCons (global_tycons env)
, vectInfoDataCon = mk_env dataCons (global_datacons env)
, vectInfoPADFun = mk_env tyCons (global_pa_funs env)
, vectInfoScalarVars = global_scalar_vars env `minusVarSet` vectInfoScalarVars info
, vectInfoScalarTyCons = global_scalar_tycons env `minusNameSet` vectInfoScalarTyCons info
}
where
vectIds = [id | Vect id _ <- vectDecls]
vectTypeTyCons = [tycon | VectType tycon _ <- vectDecls]
vectDataCons = concatMap tyConDataCons vectTypeTyCons
ids = {- typeEnvIds tyenv ++ -} vectIds
-- XXX: what Ids do you want here?
tyCons = tycons ++ vectTypeTyCons
dataCons = concatMap tyConDataCons tycons ++ vectDataCons
-- Produce an entry for every declaration that is mentioned in the domain of the 'inspectedEnv'
mk_env decls inspectedEnv
= mkNameEnv [(name, (decl, to))
| decl <- decls
, let name = getName decl
, Just to <- [lookupNameEnv inspectedEnv name]]
|
