luaur-code-gen 0.1.0

Native (A64/X64) code generation for Luau (Rust).
Documentation 
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use crate::enums::builtin_impl_type::BuiltinImplType;
use crate::enums::ir_cmd::IrCmd;
use crate::enums::ir_condition::IrCondition;
use crate::functions::builtin_check_int_64::builtin_check_int_64;
use crate::functions::builtin_load_int_64::builtin_load_int_64;
use crate::records::builtin_impl_result::BuiltinImplResult;
use crate::records::ir_builder::IrBuilder;
use crate::records::ir_op::IrOp;
use luaur_vm::enums::lua_type::lua_Type;

#[allow(non_snake_case)]
pub fn translate_builtin_int_64_extract(
    build: &mut IrBuilder,
    nparams: i32,
    ra: i32,
    arg: i32,
    args: IrOp,
    arg3: IrOp,
    nresults: i32,
    pcpos: i32,
) -> BuiltinImplResult {
    if nparams < 2 || nresults > 1 {
        return BuiltinImplResult {
            r#type: BuiltinImplType::None,
            actual_result_count: -1,
        };
    }

    let vm_reg_arg = build.vm_reg(arg as u8);
    builtin_check_int_64(build, vm_reg_arg, pcpos);
    builtin_check_int_64(build, args, pcpos);

    let n = builtin_load_int_64(build, vm_reg_arg);
    let f = builtin_load_int_64(build, args);

    let value: IrOp;
    if nparams == 2 {
        let const_0 = build.const_int_64(0);
        let cond_ge = build.cond(IrCondition::GreaterEqual);
        let vm_exit_pcpos = build.vm_exit(pcpos as u32);
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(
            IrCmd::CHECK_CMP_INT64,
            f,
            const_0,
            cond_ge,
            vm_exit_pcpos,
        );

        let const_63 = build.const_int_64(63);
        let cond_le = build.cond(IrCondition::LessEqual);
        let vm_exit_pcpos = build.vm_exit(pcpos as u32);
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(
            IrCmd::CHECK_CMP_INT64,
            f,
            const_63,
            cond_le,
            vm_exit_pcpos,
        );

        let shifted = build.inst_ir_cmd_ir_op_ir_op(IrCmd::BITRSHIFT_INT64, n, f);
        let const_1 = build.const_int_64(1);
        value = build.inst_ir_cmd_ir_op_ir_op(IrCmd::BITAND_INT64, shifted, const_1);
    } else {
        builtin_check_int_64(build, arg3, pcpos);
        let w = builtin_load_int_64(build, arg3);
        let fw = build.inst_ir_cmd_ir_op_ir_op(IrCmd::ADD_INT64, f, w);

        let const_0 = build.const_int_64(0);
        let cond_ge = build.cond(IrCondition::GreaterEqual);
        let vm_exit_pcpos = build.vm_exit(pcpos as u32);
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(
            IrCmd::CHECK_CMP_INT64,
            f,
            const_0,
            cond_ge,
            vm_exit_pcpos,
        );

        let const_63 = build.const_int_64(63);
        let cond_le = build.cond(IrCondition::LessEqual);
        let vm_exit_pcpos = build.vm_exit(pcpos as u32);
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(
            IrCmd::CHECK_CMP_INT64,
            f,
            const_63,
            cond_le,
            vm_exit_pcpos,
        );

        let const_1 = build.const_int_64(1);
        let cond_ge = build.cond(IrCondition::GreaterEqual);
        let vm_exit_pcpos = build.vm_exit(pcpos as u32);
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(
            IrCmd::CHECK_CMP_INT64,
            w,
            const_1,
            cond_ge,
            vm_exit_pcpos,
        );

        let const_64 = build.const_int_64(64);
        let cond_le = build.cond(IrCondition::LessEqual);
        let vm_exit_pcpos = build.vm_exit(pcpos as u32);
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(
            IrCmd::CHECK_CMP_INT64,
            w,
            const_64,
            cond_le,
            vm_exit_pcpos,
        );

        let const_64 = build.const_int_64(64);
        let cond_le = build.cond(IrCondition::LessEqual);
        let vm_exit_pcpos = build.vm_exit(pcpos as u32);
        build.inst_ir_cmd_ir_op_ir_op_ir_op_ir_op(
            IrCmd::CHECK_CMP_INT64,
            fw,
            const_64,
            cond_le,
            vm_exit_pcpos,
        );

        let const_64 = build.const_int_64(64);
        let shift_amount = build.inst_ir_cmd_ir_op_ir_op(IrCmd::SUB_INT64, const_64, w);
        let const_minus_1 = build.const_int_64(-1);
        let mask =
            build.inst_ir_cmd_ir_op_ir_op(IrCmd::BITRSHIFT_INT64, const_minus_1, shift_amount);

        let shifted = build.inst_ir_cmd_ir_op_ir_op(IrCmd::BITRSHIFT_INT64, n, f);
        value = build.inst_ir_cmd_ir_op_ir_op(IrCmd::BITAND_INT64, shifted, mask);
    }

    let vm_reg_ra = build.vm_reg(ra as u8);
    build.inst_ir_cmd_ir_op_ir_op(IrCmd::STORE_INT64, vm_reg_ra, value);
    let const_tag = build.const_tag(lua_Type::LUA_TINTEGER as u8);
    build.inst_ir_cmd_ir_op_ir_op(IrCmd::STORE_TAG, vm_reg_ra, const_tag);

    BuiltinImplResult {
        r#type: BuiltinImplType::Full,
        actual_result_count: 1,
    }
}