Method signature

cranelift/codegen/src/ir/libcall.rs:128–183

Get a [Signature] for the function targeted by this [LibCall].

(&self, call_conv: CallConv, pointer_type: Type)

    /// Get a [Signature] for the function targeted by this [LibCall].
    pub fn signature(&self, call_conv: CallConv, pointer_type: Type) -> Signature {
        use types::*;
        let mut sig = Signature::new(call_conv);

        match self {
            LibCall::CeilF32 | LibCall::FloorF32 | LibCall::TruncF32 | LibCall::NearestF32 => {
                sig.params.push(AbiParam::new(F32));
                sig.returns.push(AbiParam::new(F32));
            }
            LibCall::TruncF64 | LibCall::FloorF64 | LibCall::CeilF64 | LibCall::NearestF64 => {
                sig.params.push(AbiParam::new(F64));
                sig.returns.push(AbiParam::new(F64));
            }
            LibCall::FmaF32 | LibCall::FmaF64 => {
                let ty = if *self == LibCall::FmaF32 { F32 } else { F64 };

                sig.params.push(AbiParam::new(ty));
                sig.params.push(AbiParam::new(ty));
                sig.params.push(AbiParam::new(ty));
                sig.returns.push(AbiParam::new(ty));
            }
            LibCall::Memcpy | LibCall::Memmove => {
                // void* memcpy(void *dest, const void *src, size_t count);
                // void* memmove(void* dest, const void* src, size_t count);
                sig.params.push(AbiParam::new(pointer_type));
                sig.params.push(AbiParam::new(pointer_type));
                sig.params.push(AbiParam::new(pointer_type));
                sig.returns.push(AbiParam::new(pointer_type));
            }
            LibCall::Memset => {
                // void *memset(void *dest, int ch, size_t count);
                sig.params.push(AbiParam::new(pointer_type));
                sig.params.push(AbiParam::new(I32));
                sig.params.push(AbiParam::new(pointer_type));
                sig.returns.push(AbiParam::new(pointer_type));
            }
            LibCall::Memcmp => {
                // void* memcpy(void *dest, const void *src, size_t count);
                sig.params.push(AbiParam::new(pointer_type));
                sig.params.push(AbiParam::new(pointer_type));
                sig.params.push(AbiParam::new(pointer_type));
                sig.returns.push(AbiParam::new(I32))
            }

            LibCall::Probestack | LibCall::ElfTlsGetAddr | LibCall::ElfTlsGetOffset => {
                unimplemented!()
            }
            LibCall::X86Pshufb => {
                sig.params.push(AbiParam::new(I8X16));
                sig.params.push(AbiParam::new(I8X16));
                sig.returns.push(AbiParam::new(I8X16));
            }
        }

        sig
    }
}