1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
{-# LANGUAGE CPP #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -optc-DNON_POSIX_SOURCE #-}
--
-- (c) The University of Glasgow 2002-2006
--
-- | Generate infotables for interpreter-made bytecodes
module GHC.ByteCode.InfoTable ( mkITbls ) where
#include "HsVersions.h"
import GHC.Prelude
import GHC.Platform
import GHC.Platform.Profile
import GHC.ByteCode.Types
import GHC.Runtime.Interpreter
import GHC.Driver.Session
import GHC.Driver.Types
import GHC.Types.Name ( Name, getName )
import GHC.Types.Name.Env
import GHC.Core.DataCon ( DataCon, dataConRepArgTys, dataConIdentity )
import GHC.Core.TyCon ( TyCon, tyConFamilySize, isDataTyCon, tyConDataCons )
import GHC.Core.Multiplicity ( scaledThing )
import GHC.Types.RepType
import GHC.StgToCmm.Layout ( mkVirtConstrSizes )
import GHC.StgToCmm.Closure ( tagForCon, NonVoid (..) )
import GHC.Utils.Misc
import GHC.Utils.Panic
{-
Manufacturing of info tables for DataCons
-}
-- Make info tables for the data decls in this module
mkITbls :: HscEnv -> [TyCon] -> IO ItblEnv
mkITbls hsc_env tcs =
foldr plusNameEnv emptyNameEnv <$>
mapM (mkITbl hsc_env) (filter isDataTyCon tcs)
where
mkITbl :: HscEnv -> TyCon -> IO ItblEnv
mkITbl hsc_env tc
| dcs `lengthIs` n -- paranoia; this is an assertion.
= make_constr_itbls hsc_env dcs
where
dcs = tyConDataCons tc
n = tyConFamilySize tc
mkITbl _ _ = panic "mkITbl"
mkItblEnv :: [(Name,ItblPtr)] -> ItblEnv
mkItblEnv pairs = mkNameEnv [(n, (n,p)) | (n,p) <- pairs]
-- Assumes constructors are numbered from zero, not one
make_constr_itbls :: HscEnv -> [DataCon] -> IO ItblEnv
make_constr_itbls hsc_env cons =
mkItblEnv <$> mapM (uncurry mk_itbl) (zip cons [0..])
where
profile = targetProfile (hsc_dflags hsc_env)
mk_itbl :: DataCon -> Int -> IO (Name,ItblPtr)
mk_itbl dcon conNo = do
let rep_args = [ NonVoid prim_rep
| arg <- dataConRepArgTys dcon
, prim_rep <- typePrimRep (scaledThing arg) ]
(tot_wds, ptr_wds) =
mkVirtConstrSizes profile rep_args
ptrs' = ptr_wds
nptrs' = tot_wds - ptr_wds
nptrs_really
| ptrs' + nptrs' >= pc_MIN_PAYLOAD_SIZE constants = nptrs'
| otherwise = pc_MIN_PAYLOAD_SIZE constants - ptrs'
descr = dataConIdentity dcon
platform = profilePlatform profile
constants = platformConstants platform
tables_next_to_code = platformTablesNextToCode platform
r <- iservCmd hsc_env (MkConInfoTable tables_next_to_code ptrs' nptrs_really
conNo (tagForCon platform dcon) descr)
return (getName dcon, ItblPtr r)
|
