SelectionKind

public enum SelectionKind

A Comdat.SelectionKind describes the behavior of the linker when linking COMDAT sections.

  • any

    The linker may choose any COMDAT section with a matching key.

    This selection kind is the most relaxed - any section with the same key but not necessarily identical size or contents can be chosen. Precisely which section is chosen is implementation-defined.

    This selection kind is the default for all newly-inserted sections.

    Declaration

    Swift

    case any

  • The linker may choose any identically-keyed COMDAT section and requires all other referenced data to match its selection’s referenced data.

    This selection kind requires that the data in each COMDAT section be identical in length and content. Inclusion of multiple non-identical COMDAT sections with the same key is an error.

    For global objects in LLVM, identical contents is defined to mean that their initializers point to the same global IRValue.

    Declaration

    Swift

    case exactMatch

  • The linker chooses the identically-keyed COMDAT section with the largest size, ignoring content.

    Declaration

    Swift

    case largest

  • The COMDAT section with this key is unique.

    This selection requires that no other COMDAT section have the same key as this section, making the choice of selection unambiguous. Inclusion of any other COMDAT section with the same key is an error.

    Declaration

    Swift

    case noDuplicates

  • The linker may choose any identically-keyed COMDAT section and requires all other sections to have the same size as its selection.

    Declaration

    Swift

    case sameSize