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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
{-
(c) The University of Glasgow 2006
(c) The GRASP/AQUA Project, Glasgow University, 1992-1998
-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE FlexibleContexts #-}
-- | Contains a debug function to dump parts of the GHC.Hs AST. It uses a syb
-- traversal which falls back to displaying based on the constructor name, so
-- can be used to dump anything having a @Data.Data@ instance.
module GHC.Hs.Dump (
-- * Dumping ASTs
showAstData,
BlankSrcSpan(..),
) where
import GhcPrelude
import Data.Data hiding (Fixity)
import Bag
import BasicTypes
import FastString
import NameSet
import Name
import DataCon
import SrcLoc
import GHC.Hs
import GHC.Hs.Instances
import OccName hiding (occName)
import Var
import Module
import Outputable
import qualified Data.ByteString as B
data BlankSrcSpan = BlankSrcSpan | NoBlankSrcSpan
deriving (Eq,Show)
-- | Show a GHC syntax tree. This parameterised because it is also used for
-- comparing ASTs in ppr roundtripping tests, where the SrcSpan's are blanked
-- out, to avoid comparing locations, only structure
showAstData :: (DataX, Data a) => BlankSrcSpan -> a -> SDoc
showAstData b a0 = blankLine $$ showAstData' a0
where
showAstData' :: Data a => a -> SDoc
showAstData' =
generic
`ext1Q` list
`extQ` string `extQ` fastString `extQ` srcSpan
`extQ` lit `extQ` litr `extQ` litt
`extQ` bytestring
`extQ` name `extQ` occName `extQ` moduleName `extQ` var
`extQ` dataCon
`extQ` bagName `extQ` bagRdrName `extQ` bagVar `extQ` nameSet
`extQ` fixity
`ext2Q` located
where generic :: Data a => a -> SDoc
generic t = parens $ text (showConstr (toConstr t))
$$ vcat (gmapQ showAstData' t)
string :: String -> SDoc
string = text . normalize_newlines . show
fastString :: FastString -> SDoc
fastString s = braces $
text "FastString: "
<> text (normalize_newlines . show $ s)
bytestring :: B.ByteString -> SDoc
bytestring = text . normalize_newlines . show
list [] = brackets empty
list [x] = brackets (showAstData' x)
list (x1 : x2 : xs) = (text "[" <> showAstData' x1)
$$ go x2 xs
where
go y [] = text "," <> showAstData' y <> text "]"
go y1 (y2 : ys) = (text "," <> showAstData' y1) $$ go y2 ys
-- Eliminate word-size dependence
lit :: HsLit GhcPs -> SDoc
lit (HsWordPrim s x) = numericLit "HsWord{64}Prim" x s
lit (HsWord64Prim s x) = numericLit "HsWord{64}Prim" x s
lit (HsIntPrim s x) = numericLit "HsInt{64}Prim" x s
lit (HsInt64Prim s x) = numericLit "HsInt{64}Prim" x s
lit l = generic l
litr :: HsLit GhcRn -> SDoc
litr (HsWordPrim s x) = numericLit "HsWord{64}Prim" x s
litr (HsWord64Prim s x) = numericLit "HsWord{64}Prim" x s
litr (HsIntPrim s x) = numericLit "HsInt{64}Prim" x s
litr (HsInt64Prim s x) = numericLit "HsInt{64}Prim" x s
litr l = generic l
litt :: HsLit GhcTc -> SDoc
litt (HsWordPrim s x) = numericLit "HsWord{64}Prim" x s
litt (HsWord64Prim s x) = numericLit "HsWord{64}Prim" x s
litt (HsIntPrim s x) = numericLit "HsInt{64}Prim" x s
litt (HsInt64Prim s x) = numericLit "HsInt{64}Prim" x s
litt l = generic l
numericLit :: String -> Integer -> SourceText -> SDoc
numericLit tag x s = braces $ hsep [ text tag
, generic x
, generic s ]
name :: Name -> SDoc
name nm = braces $ text "Name: " <> ppr nm
occName n = braces $
text "OccName: "
<> text (OccName.occNameString n)
moduleName :: ModuleName -> SDoc
moduleName m = braces $ text "ModuleName: " <> ppr m
srcSpan :: SrcSpan -> SDoc
srcSpan ss = case b of
BlankSrcSpan -> text "{ ss }"
NoBlankSrcSpan -> braces $ char ' ' <>
(hang (ppr ss) 1
-- TODO: show annotations here
(text ""))
var :: Var -> SDoc
var v = braces $ text "Var: " <> ppr v
dataCon :: DataCon -> SDoc
dataCon c = braces $ text "DataCon: " <> ppr c
bagRdrName:: Bag (Located (HsBind GhcPs)) -> SDoc
bagRdrName bg = braces $
text "Bag(Located (HsBind GhcPs)):"
$$ (list . bagToList $ bg)
bagName :: Bag (Located (HsBind GhcRn)) -> SDoc
bagName bg = braces $
text "Bag(Located (HsBind Name)):"
$$ (list . bagToList $ bg)
bagVar :: Bag (Located (HsBind GhcTc)) -> SDoc
bagVar bg = braces $
text "Bag(Located (HsBind Var)):"
$$ (list . bagToList $ bg)
nameSet ns = braces $
text "NameSet:"
$$ (list . nameSetElemsStable $ ns)
fixity :: Fixity -> SDoc
fixity fx = braces $
text "Fixity: "
<> ppr fx
located :: (Data b,Data loc) => GenLocated loc b -> SDoc
located (L ss a) = parens $
case cast ss of
Just (s :: SrcSpan) ->
srcSpan s
Nothing -> text "nnnnnnnn"
$$ showAstData' a
normalize_newlines :: String -> String
normalize_newlines ('\\':'r':'\\':'n':xs) = '\\':'n':normalize_newlines xs
normalize_newlines (x:xs) = x:normalize_newlines xs
normalize_newlines [] = []
{-
************************************************************************
* *
* Copied from syb
* *
************************************************************************
-}
-- | The type constructor for queries
newtype Q q x = Q { unQ :: x -> q }
-- | Extend a generic query by a type-specific case
extQ :: ( Typeable a
, Typeable b
)
=> (a -> q)
-> (b -> q)
-> a
-> q
extQ f g a = maybe (f a) g (cast a)
-- | Type extension of queries for type constructors
ext1Q :: (Data d, Typeable t)
=> (d -> q)
-> (forall e. Data e => t e -> q)
-> d -> q
ext1Q def ext = unQ ((Q def) `ext1` (Q ext))
-- | Type extension of queries for type constructors
ext2Q :: (Data d, Typeable t)
=> (d -> q)
-> (forall d1 d2. (Data d1, Data d2) => t d1 d2 -> q)
-> d -> q
ext2Q def ext = unQ ((Q def) `ext2` (Q ext))
-- | Flexible type extension
ext1 :: (Data a, Typeable t)
=> c a
-> (forall d. Data d => c (t d))
-> c a
ext1 def ext = maybe def id (dataCast1 ext)
-- | Flexible type extension
ext2 :: (Data a, Typeable t)
=> c a
-> (forall d1 d2. (Data d1, Data d2) => c (t d1 d2))
-> c a
ext2 def ext = maybe def id (dataCast2 ext)
|
