Function gen_instruction_data

cranelift/codegen/meta/src/gen_inst.rs:63–103

Generate the InstructionData enum. Every variant must contain an `opcode` field. The size of `InstructionData` should be kept at 16 bytes on 64-bit architectures. If more space is needed to represent an instruction, use a `ValueList` to store the additional information out of line.

(formats: &[Rc<InstructionFormat>], fmt: &mut Formatter)

/// 16 bytes on 64-bit architectures. If more space is needed to represent an instruction, use a
/// `ValueList` to store the additional information out of line.
fn gen_instruction_data(formats: &[Rc<InstructionFormat>], fmt: &mut Formatter) {
    fmt.line("#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]");
    fmt.line(r#"#[cfg_attr(feature = "enable-serde", derive(Serialize, Deserialize))]"#);
    fmt.line("#[allow(missing_docs, reason = \"generated code\")]");
    fmt.add_block("pub enum InstructionData", |fmt| {
        for format in formats {
            fmt.add_block(&format!("{}", format.name), |fmt| {
                fmt.line("opcode: Opcode,");
                if format.has_value_list {
                    fmt.line("args: ValueList,");
                } else if format.num_value_operands == 1 {
                    fmt.line("arg: Value,");
                } else if format.num_value_operands > 0 {
                    fmtln!(fmt, "args: [Value; {}],", format.num_value_operands);
                }

                match format.num_block_operands {
                    0 => (),
                    1 => fmt.line("destination: ir::BlockCall,"),
                    2 => fmtln!(
                        fmt,
                        "blocks: [ir::BlockCall; {}],",
                        format.num_block_operands
                    ),
                    n => panic!("Too many block operands in instruction: {n}"),
                }

                match format.num_raw_block_operands {
                    0 => (),
                    1 => fmt.line("block: ir::Block,"),
                    n => panic!("Too many block operands in instruction: {n}"),
                }

                for field in &format.imm_fields {
                    fmtln!(fmt, "{}: {},", field.member, field.kind.rust_type);
                }
            });
            fmtln!(fmt, ",");
        }
    });
}

fn gen_arguments_method(formats: &[Rc<InstructionFormat>], fmt: &mut Formatter, is_mut: bool) {
    let (method, mut_, rslice, as_slice) = if is_mut {