Attributes

• Attributes
  • ASTFunctionDeclAttr
    • Parameters:
  • ASTRecordDeclAttr
    • Parameters:
  • ASTVarDeclAttr
    • Parameters:
  • ConstArrayAttr
    • Parameters:
  • ConstStructAttr
    • Parameters:
  • GlobalViewAttr
    • Parameters:
  • NullAttr
    • Parameters:
  • SignedOverflowBehaviorAttr
    • Parameters:
  • TypeInfoAttr
    • Parameters:
  • VTableAttr
    • Parameters:
  • ZeroAttr
    • Parameters:

ASTFunctionDeclAttr

Wraps a ‘const clang::FunctionDecl *' AST node.

Operations optionally refer to this node, they could be available depending on the CIR lowering stage. Whether it's attached to the appropriated CIR operation is delegated to the operation verifier.

This always implies a non-null AST reference (verified).

Parameters:

ASTRecordDeclAttr

Wraps a ‘const clang::RecordDecl *' AST node.

Operations optionally refer to this node, they could be available depending on the CIR lowering stage. Whether it's attached to the appropriated CIR operation is delegated to the operation verifier.

This always implies a non-null AST reference (verified).

Parameters:

ASTVarDeclAttr

Wraps a ‘const clang::VarDecl *' AST node.

Operations optionally refer to this node, they could be available depending on the CIR lowering stage. Whether it's attached to the appropriated CIR operation is delegated to the operation verifier.

This always implies a non-null AST reference (verified).

Parameters:

ConstArrayAttr

A constant array from ArrayAttr or StringRefAttr

An CIR array attribute is an array of literals of the specified attr types.

Parameters:

ConstStructAttr

Represents a constant struct

Syntax:

#cir.const_struct<
  ::mlir::Type,   # type
  ArrayAttr   # members
>

Effectively supports "struct-like" constants. It's must be built from an mlir::ArrayAttr instance where each elements is a typed attribute (mlir::TypedAttribute).

Example:

cir.global external @rgb2 = #cir.const_struct<{0 : i8,
                                               5 : i64, #cir.null : !cir.ptr<i8>
                                              }> : !cir.struct<"", i8, i64, !cir.ptr<i8>>

Parameters:

GlobalViewAttr

Provides constant access to a global address

Syntax:

#cir.global_view<
  ::mlir::Type,   # type
  FlatSymbolRefAttr,   # symbol
  ArrayAttr   # indices
>

Get constant address of global symbol and optionally apply offsets to access existing subelements. It provides a way to access globals from other global and always produces a pointer.

The type of the input symbol can be different from #cir.global_view output type, since a given view of the global might require a static cast for initializing other globals.

A list of indices can be optionally passed and each element subsequently indexes underlying types. For symbol types like !cir.array and !cir.struct, it leads to the constant address of sub-elements, while for !cir.ptr, an offset is applied. The first index is relative to the original symbol type, not the produced one.

Example:

  cir.global external @s = @".str2": !cir.ptr<i8>
  cir.global external @x = #cir.global_view<@s> : !cir.ptr<i8>

  cir.global external @rgb = #cir.const_array<[0 : i8, -23 : i8, 33 : i8] : !cir.array<i8 x 3>>
  cir.global external @elt_ptr = #cir.global_view<@rgb, [1]> : !cir.ptr<i8>
  cir.global external @table_of_ptrs = #cir.const_array<[#cir.global_view<@rgb, [1]> : !cir.ptr<i8>] : !cir.array<!cir.ptr<i8> x 1>>

Parameters:

NullAttr

A simple attr to represent nullptr

Syntax:

#cir.null<
  ::mlir::Type   # type
>

The NullAttr represents the value of nullptr within cir.

Parameters:

SignedOverflowBehaviorAttr

Parameters:

TypeInfoAttr

Represents a typeinfo used for RTTI

Syntax:

#cir.typeinfo<
  ::mlir::Type,   # type
  ConstStructAttr   # typeinfo_data
>

The typeinfo data for a given class is stored into an ArrayAttr. The layout is determined by the C++ ABI used (clang only implements itanium on CIRGen).

The verifier enforces that the output type is always a !cir.struct, and that the ArrayAttr element types match the equivalent member type for the resulting struct.

Example:

cir.global "private" external @_ZTVN10__cxxabiv120__si_class_type_infoE : !cir.ptr<i32>

cir.global external @type_info_B = #cir.typeinfo<<
  {#cir.global_view<@_ZTVN10__cxxabiv120__si_class_type_infoE, [2]> : !cir.ptr<i8>}
>> : !cir.struct<"", !cir.ptr<i8>>

Parameters:

VTableAttr

Represents a C++ vtable

Syntax:

#cir.vtable<
  ::mlir::Type,   # type
  ConstStructAttr   # vtable_data
>

Wraps a #cir.const_struct containing vtable data.

Example:

cir.global linkonce_odr @_ZTV1B = #cir.vtable<<
    {#cir.const_array<[#cir.null : !cir.ptr<i8>,
     #cir.global_view<@_ZTI1B> : !cir.ptr<i8>,
     #cir.global_view<@_ZN1BD1Ev> : !cir.ptr<i8>,
     #cir.global_view<@_ZN1BD0Ev> : !cir.ptr<i8>,
     #cir.global_view<@_ZNK1A5quackEv> : !cir.ptr<i8>]>
     : !cir.array<!cir.ptr<i8> x 5>}>>
  : !cir.struct<"", !cir.array<!cir.ptr<i8> x 5>>

Parameters:

ZeroAttr

Attribute to represent zero initialization

Syntax:

#cir.zero<
  ::mlir::Type   # type
>

The ZeroAttr is used to indicate zero initialization on structs.

Parameters: