Enum CallingConvention

pub enum CallingConvention {
    SystemV,
    WindowsFastcall,
    AppleAarch64,
    Default,
}

Calling conventions supported by Winch. Winch supports a variation of the calling conventions defined in this enum plus an internal default calling convention.

This enum is a reduced subset of the calling conventions defined in cranelift_codegen::isa::CallConv. Introducing this enum makes it easier to enforce the invariant of all the calling conventions supported by Winch.

The main difference between the system calling conventions defined in this enum and their native counterparts is how multiple returns are handled. Given that Winch is not meant to be a standalone code generator, the code it generates is tightly coupled to how Wasmtime expects multiple returns to be handled: the first return in a register, dictated by the calling convention and the rest, if any, via a return pointer.

Variants

SystemV

See cranelift_codegen::isa::CallConv::WasmtimeSystemV

WindowsFastcall

See cranelift_codegen::isa::CallConv::WindowsFastcall

AppleAarch64

See cranelift_codegen::isa::CallConv::AppleAarch64

Default

The default calling convention for Winch. It largely follows SystemV for parameter and result handling. This calling convention is part of Winch’s default ABI crate::abi::ABI.

Implementations

impl CallingConvention

pub fn is_default(&self) -> bool

Returns true if the current calling convention is Default.

Trait Implementations

impl Clone for CallingConvention

fn clone(&self) -> CallingConvention

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CallingConvention

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for CallingConvention