(i1 + i2) only if it results in a valid Float.
\begin{code}
-
{-# OPTIONS -optc-DNON_POSIX_SOURCE #-}
-module PrelRules (
- primOpRules, builtinRules,
-
- -- Error Ids defined here because may be called here
- mkRuntimeErrorApp, mkImpossibleExpr,
- rEC_CON_ERROR_ID, iRREFUT_PAT_ERROR_ID, rUNTIME_ERROR_ID,
- nON_EXHAUSTIVE_GUARDS_ERROR_ID, nO_METHOD_BINDING_ERROR_ID,
- pAT_ERROR_ID, eRROR_ID, rEC_SEL_ERROR_ID,
- ) where
+module PrelRules ( primOpRules, builtinRules ) where
#include "HsVersions.h"
import CoreSyn
-import MkCore ( mkWildCase )
+import MkCore
import Id
-import IdInfo
-import Demand
import Literal
import PrimOp ( PrimOp(..), tagToEnumKey )
import TysWiredIn
-import TysPrim
import TyCon ( tyConDataCons_maybe, isEnumerationTyCon, isNewTyCon )
import DataCon ( dataConTag, dataConTyCon, dataConWorkId, fIRST_TAG )
import CoreUtils ( cheapEqExpr )
import CoreUnfold ( exprIsConApp_maybe )
-import TcType ( mkSigmaTy )
import Type
import OccName ( occNameFS )
import PrelNames
match_inline _ _ = Nothing
\end{code}
-%************************************************************************
-%* *
-\subsection[PrelVals-error-related]{@error@ and friends; @trace@}
-%* *
-%************************************************************************
-b
-GHC randomly injects these into the code.
-
-@patError@ is just a version of @error@ for pattern-matching
-failures. It knows various ``codes'' which expand to longer
-strings---this saves space!
-
-@absentErr@ is a thing we put in for ``absent'' arguments. They jolly
-well shouldn't be yanked on, but if one is, then you will get a
-friendly message from @absentErr@ (rather than a totally random
-crash).
-
-@parError@ is a special version of @error@ which the compiler does
-not know to be a bottoming Id. It is used in the @_par_@ and @_seq_@
-templates, but we don't ever expect to generate code for it.
-
-\begin{code}
-mkRuntimeErrorApp
- :: Id -- Should be of type (forall a. Addr# -> a)
- -- where Addr# points to a UTF8 encoded string
- -> Type -- The type to instantiate 'a'
- -> String -- The string to print
- -> CoreExpr
-
-mkRuntimeErrorApp err_id res_ty err_msg
- = mkApps (Var err_id) [Type res_ty, err_string]
- where
- err_string = Lit (mkMachString err_msg)
-
-mkImpossibleExpr :: Type -> CoreExpr
-mkImpossibleExpr res_ty
- = mkRuntimeErrorApp rUNTIME_ERROR_ID res_ty "Impossible case alternative"
-
-errorName, recSelErrorName, runtimeErrorName :: Name
-irrefutPatErrorName, recConErrorName, patErrorName :: Name
-nonExhaustiveGuardsErrorName, noMethodBindingErrorName :: Name
-errorName = mkWiredInIdName gHC_ERR (fsLit "error") errorIdKey eRROR_ID
-recSelErrorName = mkWiredInIdName cONTROL_EXCEPTION_BASE (fsLit "recSelError") recSelErrorIdKey rEC_SEL_ERROR_ID
-runtimeErrorName = mkWiredInIdName cONTROL_EXCEPTION_BASE (fsLit "runtimeError") runtimeErrorIdKey rUNTIME_ERROR_ID
-irrefutPatErrorName = mkWiredInIdName cONTROL_EXCEPTION_BASE (fsLit "irrefutPatError") irrefutPatErrorIdKey iRREFUT_PAT_ERROR_ID
-recConErrorName = mkWiredInIdName cONTROL_EXCEPTION_BASE (fsLit "recConError") recConErrorIdKey rEC_CON_ERROR_ID
-patErrorName = mkWiredInIdName cONTROL_EXCEPTION_BASE (fsLit "patError") patErrorIdKey pAT_ERROR_ID
-noMethodBindingErrorName = mkWiredInIdName cONTROL_EXCEPTION_BASE (fsLit "noMethodBindingError")
- noMethodBindingErrorIdKey nO_METHOD_BINDING_ERROR_ID
-nonExhaustiveGuardsErrorName
- = mkWiredInIdName cONTROL_EXCEPTION_BASE (fsLit "nonExhaustiveGuardsError")
- nonExhaustiveGuardsErrorIdKey nON_EXHAUSTIVE_GUARDS_ERROR_ID
-
-rEC_SEL_ERROR_ID, rUNTIME_ERROR_ID, iRREFUT_PAT_ERROR_ID, rEC_CON_ERROR_ID :: Id
-pAT_ERROR_ID, nO_METHOD_BINDING_ERROR_ID, nON_EXHAUSTIVE_GUARDS_ERROR_ID :: Id
-rEC_SEL_ERROR_ID = mkRuntimeErrorId recSelErrorName
-rUNTIME_ERROR_ID = mkRuntimeErrorId runtimeErrorName
-iRREFUT_PAT_ERROR_ID = mkRuntimeErrorId irrefutPatErrorName
-rEC_CON_ERROR_ID = mkRuntimeErrorId recConErrorName
-pAT_ERROR_ID = mkRuntimeErrorId patErrorName
-nO_METHOD_BINDING_ERROR_ID = mkRuntimeErrorId noMethodBindingErrorName
-nON_EXHAUSTIVE_GUARDS_ERROR_ID = mkRuntimeErrorId nonExhaustiveGuardsErrorName
-
--- The runtime error Ids take a UTF8-encoded string as argument
-
-mkRuntimeErrorId :: Name -> Id
-mkRuntimeErrorId name = pc_bottoming_Id name runtimeErrorTy
-
-runtimeErrorTy :: Type
-runtimeErrorTy = mkSigmaTy [openAlphaTyVar] [] (mkFunTy addrPrimTy openAlphaTy)
-\end{code}
-
-\begin{code}
-eRROR_ID :: Id
-eRROR_ID = pc_bottoming_Id errorName errorTy
-
-errorTy :: Type
-errorTy = mkSigmaTy [openAlphaTyVar] [] (mkFunTys [mkListTy charTy] openAlphaTy)
- -- Notice the openAlphaTyVar. It says that "error" can be applied
- -- to unboxed as well as boxed types. This is OK because it never
- -- returns, so the return type is irrelevant.
-\end{code}
-
-
-%************************************************************************
-%* *
-\subsection{Utilities}
-%* *
-%************************************************************************
-
-\begin{code}
-pc_bottoming_Id :: Name -> Type -> Id
--- Function of arity 1, which diverges after being given one argument
-pc_bottoming_Id name ty
- = mkVanillaGlobalWithInfo name ty bottoming_info
- where
- bottoming_info = vanillaIdInfo `setStrictnessInfo` Just strict_sig
- `setArityInfo` 1
- -- Make arity and strictness agree
-
- -- Do *not* mark them as NoCafRefs, because they can indeed have
- -- CAF refs. For example, pAT_ERROR_ID calls GHC.Err.untangle,
- -- which has some CAFs
- -- In due course we may arrange that these error-y things are
- -- regarded by the GC as permanently live, in which case we
- -- can give them NoCaf info. As it is, any function that calls
- -- any pc_bottoming_Id will itself have CafRefs, which bloats
- -- SRTs.
-
- strict_sig = mkStrictSig (mkTopDmdType [evalDmd] BotRes)
- -- These "bottom" out, no matter what their arguments
-\end{code}
-
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