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LARA
inox
Commits
949856a9
Commit
949856a9
authored
14 years ago
by
Utkarsh Upadhyay
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Partial evaluation of catamorphisms (will be inducted in elsewhere in the code).
parent
f572ef59
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src/orderedsets/getAlpha.scala
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949856a9
package
orderedsets
import
purescala._
import
Trees._
import
Common._
import
TypeTrees._
import
Definitions._
import
scala.collection.mutable.
{
Set
=>
MutableSet
}
object
getAlpha
{
var
program
:
Program
=
null
def
setProgram
(
p
:
Program
)
=
program
=
p
def
searchAndApply
(
subst
:
Expr
=>
Option
[
Expr
],
recursive
:
Boolean
=
true
)(
expr
:
Expr
)
=
{
def
rec
(
ex
:
Expr
,
skip
:
Expr
=
null
)
:
Expr
=
(
if
(
ex
==
skip
)
None
else
subst
(
ex
))
match
{
case
Some
(
newExpr
)
=>
{
if
(
newExpr
.
getType
==
NoType
)
{
Settings
.
reporter
.
warning
(
"REPLACING IN EXPRESSION WITH AN UNTYPED TREE ! "
+
ex
+
" --to--> "
+
newExpr
)
}
if
(
ex
==
newExpr
)
if
(
recursive
)
rec
(
ex
,
ex
)
else
ex
else
if
(
recursive
)
rec
(
newExpr
)
else
newExpr
}
case
None
=>
ex
match
{
case
l
@
Let
(
i
,
e
,
b
)
=>
{
val
re
=
rec
(
e
)
val
rb
=
rec
(
b
)
if
(
re
!=
e
||
rb
!=
b
)
Let
(
i
,
re
,
rb
).
setType
(
l
.
getType
)
else
l
}
case
f
@
FunctionInvocation
(
fd
,
args
)
=>
{
var
change
=
false
val
rargs
=
args
.
map
(
a
=>
{
val
ra
=
rec
(
a
)
if
(
ra
!=
a
)
{
change
=
true
ra
}
else
{
a
}
})
if
(
change
)
FunctionInvocation
(
fd
,
rargs
).
setType
(
f
.
getType
)
else
f
}
case
i
@
IfExpr
(
t1
,
t2
,
t3
)
=>
IfExpr
(
rec
(
t1
),
rec
(
t2
),
rec
(
t3
)).
setType
(
i
.
getType
)
case
m
@
MatchExpr
(
scrut
,
cses
)
=>
MatchExpr
(
rec
(
scrut
),
cses
.
map
(
inCase
(
_
))).
setType
(
m
.
getType
)
case
And
(
exs
)
=>
And
(
exs
.
map
(
rec
(
_
)))
case
Or
(
exs
)
=>
Or
(
exs
.
map
(
rec
(
_
)))
case
Not
(
e
)
=>
Not
(
rec
(
e
))
case
u
@
UnaryOperator
(
t
,
recons
)
=>
{
val
r
=
rec
(
t
)
if
(
r
!=
t
)
recons
(
r
).
setType
(
u
.
getType
)
else
u
}
case
b
@
BinaryOperator
(
t1
,
t2
,
recons
)
=>
{
val
r1
=
rec
(
t1
)
val
r2
=
rec
(
t2
)
if
(
r1
!=
t1
||
r2
!=
t2
)
recons
(
r1
,
r2
).
setType
(
b
.
getType
)
else
b
}
case
c
@
CaseClass
(
cd
,
args
)
=>
{
CaseClass
(
cd
,
args
.
map
(
rec
(
_
))).
setType
(
c
.
getType
)
}
case
c
@
CaseClassSelector
(
cc
,
sel
)
=>
{
val
rc
=
rec
(
cc
)
if
(
rc
!=
cc
)
CaseClassSelector
(
rc
,
sel
).
setType
(
c
.
getType
)
else
c
}
case
_
=>
ex
}
}
def
inCase
(
cse
:
MatchCase
)
:
MatchCase
=
cse
match
{
case
SimpleCase
(
pat
,
rhs
)
=>
SimpleCase
(
pat
,
rec
(
rhs
))
case
GuardedCase
(
pat
,
guard
,
rhs
)
=>
GuardedCase
(
pat
,
rec
(
guard
),
rec
(
rhs
))
}
rec
(
expr
)
}
def
asCatamorphism
(
f
:
FunDef
)
:
Option
[
Seq
[(
CaseClassDef
,
Identifier
,
Seq
[
Identifier
]
,
Expr
)]]
=
{
def
recCallsOnMatchedVars
(
l
:
(
CaseClassDef
,
Identifier
,
Seq
[
Identifier
],
Expr
))
=
{
var
varSet
=
MutableSet
.
empty
[
Identifier
]
searchAndApply
({
case
FunctionInvocation
(
_
,
Seq
(
Variable
(
id
)))
=>
varSet
+=
id
;
None
;
case
_
=>
None
})(
l
.
_4
)
varSet
.
subsetOf
(
l
.
_3
.
toSet
)
}
val
c
=
this
.
program
.
callees
(
f
)
if
(
f
.
hasImplementation
&&
f
.
args
.
size
==
1
&&
c
.
size
==
1
&&
c
.
head
==
f
)
f
.
body
.
get
match
{
case
SimplePatternMatching
(
scrut
,
_
,
lstMatches
)
if
(
scrut
==
f
.
args
.
head
.
toVariable
)
&&
lstMatches
.
forall
(
recCallsOnMatchedVars
)
=>
Some
(
lstMatches
)
case
_
=>
None
}
else
{
None
}
}
def
isAlpha
(
varMap
:
Variable
=>
Expr
)(
t
:
Expr
)
:
Option
[
Expr
]
=
t
match
{
case
FunctionInvocation
(
fd
,
Seq
(
v
@
Variable
(
_
)))
=>
asCatamorphism
(
fd
)
match
{
case
None
=>
None
case
Some
(
lstMatch
)
=>
varMap
(
v
)
match
{
case
CaseClass
(
cd
,
args
)
=>
{
val
(
_
,
_
,
ids
,
rhs
)
=
lstMatch
.
find
(
_
.
_1
==
cd
).
get
val
repMap
=
Map
(
ids
.
map
(
id
=>
Variable
(
id
)
:
Expr
).
zip
(
args
)
:_
*
)
Some
(
searchAndApply
(
repMap
.
get
)(
rhs
))
}
case
u
@
Variable
(
_
)
=>
{
val
c
=
Variable
(
FreshIdentifier
(
"Coll"
,
true
)).
setType
(
t
.
getType
)
// TODO: Keep track of these variables for M1(t, c)
Some
(
c
)
}
case
_
=>
error
(
"Bad substitution"
)
}
case
_
=>
None
}
case
_
=>
None
}
def
apply
(
t
:
Expr
,
varMap
:
Variable
=>
Expr
)
:
Expr
=
{
searchAndApply
(
isAlpha
(
varMap
))(
t
)
}
// def solve(e : Expr): Option[Boolean] = {
// searchAndApply(isAlpha(x => x))(e)
// None
// }
}
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