BlockCall¶
Call to block symbol, a stmt node.
Declaration¶
Syntax¶
BlockCall(int label, symbol m)
Arguments¶
label contains integer value of a label.
m points to the Block symbol to call.
Return values¶
None.
Description¶
BlockCall signifies the block symbol call. The Block represents a
scoped collection of statements and its own symbol table. The Block itself is
part of a symbol table, and the BlockCall node is used to call it in order to execute the statements inside the block i.e., once the control reaches the BlockCall only then the statements inside the block it refers to are executed.
Find more information on block.
Types¶
label must be of type integer.
m must be of type symbol.
Examples¶
program block
integer :: a
a = 10
1 loop: block
integer :: b
a = a + 5
if (a == 15) go to 1
b = a / 2
call square(b)
end block loop
end program block
subroutine square(b)
integer :: b, result
result = b * b
if (result /= 100) error stop
print *, result
end subroutine square
ASR:
(TranslationUnit
(SymbolTable
1
{
block:
(Program
(SymbolTable
2
{
a:
(Variable
2
a
Local
()
()
Default
(Integer 4 [])
Source
Public
Required
.false.
),
block:
(Block
(SymbolTable
4
{
b:
(Variable
4
b
Local
()
()
Default
(Integer 4 [])
Source
Public
Required
.false.
)
})
block
[(=
(Var 2 a)
(IntegerBinOp
(Var 2 a)
Add
(IntegerConstant 5 (Integer 4 []))
(Integer 4 [])
()
)
()
)
(If
(IntegerCompare
(Var 2 a)
Eq
(IntegerConstant 15 (Integer 4 []))
(Logical 4 [])
()
)
[(GoTo
1
1
)]
[]
)
(=
(Var 4 b)
(IntegerBinOp
(Var 2 a)
Div
(IntegerConstant 2 (Integer 4 []))
(Integer 4 [])
()
)
()
)
(SubroutineCall
1 square
()
[((Var 4 b))]
()
)]
)
})
block
[]
[(=
(Var 2 a)
(IntegerConstant 10 (Integer 4 []))
()
)
(GoToTarget
1
1
)
(BlockCall
-1
2 block
)]
),
square:
(Function
(SymbolTable
3
{
b:
(Variable
3
b
Unspecified
()
()
Default
(Integer 4 [])
Source
Public
Required
.false.
),
result:
(Variable
3
result
Local
()
()
Default
(Integer 4 [])
Source
Public
Required
.false.
)
})
square
[(Var 3 b)]
[(=
(Var 3 result)
(IntegerBinOp
(Var 3 b)
Mul
(Var 3 b)
(Integer 4 [])
()
)
()
)
(If
(IntegerCompare
(Var 3 result)
NotEq
(IntegerConstant 100 (Integer 4 []))
(Logical 4 [])
()
)
[(ErrorStop
()
)]
[]
)
(Print
()
[(Var 3 result)]
()
()
)]
()
Source
Public
Implementation
()
.false.
.false.
.false.
.false.
.false.
[]
[]
.false.
)
})
[]
)