Nullify¶
Disassociates a pointer from a target, a stmt node.
Declaration¶
Syntax¶
Nullify(symbol* vars)
Arguments¶
vars contains pointer object to symbol variables.
Return values¶
None.
Description¶
Nullify disassociates a pointer from a target. The initial disassociation
status of a pointer is undefined. It is used to NULLIFY to initialize an
undefined pointer, giving it disassociated status.
Types¶
Examples¶
program nullify
implicit none
integer, pointer :: p1, p2
integer, target :: t1
p1=>t1
p2=>t1
p1 = 1
nullify(p1, p2)
end
ASR:
(TranslationUnit
(SymbolTable
1
{
nullify:
(Program
(SymbolTable
2
{
p1:
(Variable
2
p1
Local
()
()
Default
(Pointer
(Integer 4 [])
)
Source
Public
Required
.false.
),
p2:
(Variable
2
p2
Local
()
()
Default
(Pointer
(Integer 4 [])
)
Source
Public
Required
.false.
),
t1:
(Variable
2
t1
Local
()
()
Default
(Integer 4 [])
Source
Public
Required
.false.
)
})
nullify
[]
[(=>
(Var 2 p1)
(Var 2 t1)
)
(=>
(Var 2 p2)
(Var 2 t1)
)
(=
(Var 2 p1)
(IntegerConstant 1 (Integer 4 []))
()
)
(Nullify
[2 p1
2 p2]
)]
)
})
[]
)