Call

public struct Call : IRInstruction

Represents a simple function call.

  • Retrieves the underlying LLVM value object.

    Declaration

    Swift

    public func asLLVM() -> LLVMValueRef

  • Retrieves the number of argument operands passed by this call.

    Declaration

    Swift

    public var argumentCount: Int { get }

  • Accesses the calling convention for this function call.

    Declaration

    Swift

    public var callingConvention: CallingConvention { get set }

  • Returns whether this function call is a tail call.

    A tail call may not reference memory in the stack frame of the calling function. Therefore, the callee may reuse the stack memory of the caller.

    This attribute requires support from the target architecture.

    Declaration

    Swift

    public var isTailCall: Bool { get set }

  • Accesses the tail call marker associated with this call.

    The presence of the tail call marker affects the optimizer’s decisions around tail call optimizations. The presence of a tail or mustTail marker, either inserted by the user or by the optimizer, is a strong hint (or a requirement) that tail call optimizations occur. The presence of noTail acts to block any tail call optimization.

    Tail call optimization is finicky and requires a number of complex invariants hold before a call is eligible for the optimization. Even then, it is not necessarily guaranteed by LLVM in all cases.

    Declaration

    Swift

    public var tailCallKind: TailCallKind { get set }

  • Retrieves the alignment of the parameter at the given index.

    This property is currently set-only due to limitations of the LLVM C API.

    Declaration

    Swift

    public func setParameterAlignment(at i: Int, to alignment: Alignment)

    Parameters

    i

    The index of the parameter to retrieve.
    alignment

    The alignment to apply to the parameter.

  • Optimization markers for tail call elimination.

    See more

    Declaration

    Swift

    public enum TailCallKind