CPtr¶
A C pointer: an address with no type and no shape.
Declaration¶
Syntax¶
CPtr(cptr_kind kind)
Arguments¶
kind is CPointer, CFunPointer, or CPtrUnspecified, distinguishing c_ptr from c_funptr once semantics has resolved the intrinsic symbols.
Return values¶
None. A type is not evaluated.
Description¶
type(c_ptr) or type(c_funptr) from iso_c_binding. It carries an address and optional identity for which C pointer type it is, but no pointee type or shape, so
nothing can be read through it until
CPtrToPointer supplies the type and the
shape.
Examples¶
(CPtr
:kind :CPtrUnspecified
)
It comes from this complete ASR text document:
(TranslationUnit
:symtab (SymbolTable
:id 0
:symbols {
"main" (Program
:symtab (SymbolTable
:id 1
:symbols {
"b" (Variable
:parent_symtab 1
:name "b"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Logical
:kind 4
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
:common_block nil
)
"c" (Variable
:parent_symtab 1
:name "c"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (CPtr
:kind :CPtrUnspecified
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
:common_block nil
)
"n" (Variable
:parent_symtab 1
:name "n"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Integer
:kind 8
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
:common_block nil
)
"p" (Variable
:parent_symtab 1
:name "p"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Pointer
:type (Integer
:kind 4
)
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
:common_block nil
)
"target" (Variable
:parent_symtab 1
:name "target"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Integer
:kind 4
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr true
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
:common_block nil
)
}
)
:name "main"
:dependencies []
:body [
(Assignment
:target (Var
:v (SymbolRef 1 "c")
)
:value (CLoc
:arg (Var
:v (SymbolRef 1 "target")
)
:type (CPtr
:kind :CPtrUnspecified
)
:value nil
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
(Assignment
:target (Var
:v (SymbolRef 1 "c")
)
:value (PointerToCPtr
:arg (Var
:v (SymbolRef 1 "p")
)
:type (CPtr
:kind :CPtrUnspecified
)
:value nil
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
(Associate
:target (Var
:v (SymbolRef 1 "p")
)
:value (GetPointer
:arg (Var
:v (SymbolRef 1 "target")
)
:type (Pointer
:type (Integer
:kind 4
)
)
:value nil
)
)
(Assignment
:target (Var
:v (SymbolRef 1 "b")
)
:value (CPtrCompare
:left (Var
:v (SymbolRef 1 "c")
)
:op :Eq
:right (Var
:v (SymbolRef 1 "c")
)
:type (Logical
:kind 4
)
:value nil
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
(Assignment
:target (Var
:v (SymbolRef 1 "b")
)
:value (PointerAssociated
:ptr (Var
:v (SymbolRef 1 "p")
)
:tgt (Var
:v (SymbolRef 1 "target")
)
:type (Logical
:kind 4
)
:value nil
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
(Assignment
:target (Var
:v (SymbolRef 1 "n")
)
:value (SizeOfType
:arg (Integer
:kind 4
)
:type (Integer
:kind 8
)
:value nil
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
]
:global_init nil
)
}
)
:items []
:global_init nil
)