ArrayIsContiguous¶
Whether an array occupies contiguous storage.
声明¶
语法¶
ArrayIsContiguous(expr array, ttype type, expr? value)
参数¶
Argument |
描述 |
|---|---|
|
the array to test. |
|
the logical type of the result. |
|
the compile time value of the expression, when the frontend could fold it; |
返回值¶
The value of the expression.
描述¶
is_contiguous(a). A section with a stride, or one that fixes a subscript in
the wrong dimension, is not contiguous, and a procedure that requires
contiguity has to copy it. The test lets generated code choose between a fast
path and a copy.
示例¶
(ArrayIsContiguous
:array (Var
:v (SymbolRef 1 "a")
)
:type (Logical
:kind 4
)
:value nil
)
It comes from this complete ASR text document:
(TranslationUnit
:symtab (SymbolTable
:id 0
:symbols {
"main" (Program
:symtab (SymbolTable
:id 1
:symbols {
"a" (Variable
:parent_symtab 1
:name "a"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Array
:type (Integer
:kind 4
)
:dims [
(dimension
:start (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:length (IntegerConstant
:n 3
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
]
:physical_type :FixedSizeArray
:memory_space :Global
)
: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 []
)
"b" (Variable
:parent_symtab 1
:name "b"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Array
:type (Integer
:kind 4
)
:dims [
(dimension
:start (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:length (IntegerConstant
:n 3
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
]
:physical_type :FixedSizeArray
:memory_space :Global
)
:type_declaration nil
:abi :Source
:access :Public
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:value_attr false
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:bindc_name nil
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:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
)
"i" (Variable
:parent_symtab 1
:name "i"
:dependencies []
:intent :Local
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:storage :Default
:type (Integer
:kind 4
)
:type_declaration nil
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)
"l" (Variable
:parent_symtab 1
:name "l"
: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
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:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
)
}
)
:name "main"
:dependencies []
:body [
(Assignment
:target (Var
:v (SymbolRef 1 "a")
)
:value (ArrayConstant
:n_data 12
:data #asr/bytes "010000000200000003000000"
:type (Array
:type (Integer
:kind 4
)
:dims [
(dimension
:start (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:length (IntegerConstant
:n 3
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
]
:physical_type :FixedSizeArray
:memory_space :Global
)
:storage_format :ColMajor
)
:overloaded nil
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:move_allocation false
)
(Assignment
:target (Var
:v (SymbolRef 1 "i")
)
:value (ArrayItem
:v (Var
:v (SymbolRef 1 "a")
)
:args [
(array_index
:left nil
:right (IntegerConstant
:n 2
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:step nil
)
]
:type (Integer
:kind 4
)
:storage_format :ColMajor
:value nil
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
(Assignment
:target (Var
:v (SymbolRef 1 "b")
)
:value (ArraySection
:v (Var
:v (SymbolRef 1 "a")
)
:args [
(array_index
:left (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:right (IntegerConstant
:n 3
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:step (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
]
:type (Array
:type (Integer
:kind 4
)
:dims [
(dimension
:start (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:length (IntegerConstant
:n 3
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
]
:physical_type :DescriptorArray
:memory_space :Global
)
:value nil
)
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)
(Assignment
:target (Var
:v (SymbolRef 1 "i")
)
:value (ArraySize
:v (Var
:v (SymbolRef 1 "a")
)
:dim (IntegerConstant
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:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:type (Integer
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)
:value nil
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)
(Assignment
:target (Var
:v (SymbolRef 1 "i")
)
:value (ArrayRank
:v (Var
:v (SymbolRef 1 "a")
)
:type (Integer
:kind 4
)
:value nil
)
:overloaded nil
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)
(Assignment
:target (Var
:v (SymbolRef 1 "i")
)
:value (ArrayBound
:v (Var
:v (SymbolRef 1 "a")
)
:dim (IntegerConstant
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:kind 4
)
:intboz_type :Decimal
)
:type (Integer
:kind 4
)
:bound :UBound
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)
:overloaded nil
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)
(Assignment
:target (Var
:v (SymbolRef 1 "l")
)
:value (ArrayIsContiguous
:array (Var
:v (SymbolRef 1 "a")
)
:type (Logical
:kind 4
)
:value nil
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
]
)
}
)
:items []
)