luaur-code-gen 0.1.0

Native (A64/X64) code generation for Luau (Rust).
Documentation 
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use crate::enums::ir_block_kind::IrBlockKind;
use crate::functions::add_use::add_use;
use crate::functions::is_block_terminator::is_block_terminator;
use crate::functions::kill_ir_utils_alt_b::kill_ir_function_u32_u32;
use crate::functions::remove_use::remove_use;
use crate::macros::codegen_assert::CODEGEN_ASSERT;
use crate::records::ir_block::IrBlock;
use crate::records::ir_function::IrFunction;
use crate::records::ir_inst::IrInst;
use crate::records::ir_op::IrOp;

pub fn replace_ir_function_ir_block_u32_ir_inst(
    function: &mut IrFunction,
    block: &mut IrBlock,
    inst_idx: u32,
    mut replacement: IrInst,
) {
    // Add uses before removing new ones if those are the last ones keeping target operand alive
    let rn = replacement.ops.size();
    for i in 0..rn {
        let op: IrOp = replacement.ops.as_slice()[i as usize];
        add_use(function, op);
    }

    // If we introduced an earlier terminating instruction, all following instructions become dead
    let inst_cmd = function.instructions[inst_idx as usize].cmd;
    if !is_block_terminator(inst_cmd) && is_block_terminator(replacement.cmd) {
        // Block has has to be fully constructed before replacement is performed
        CODEGEN_ASSERT!(block.finish != !0u32);
        CODEGEN_ASSERT!(inst_idx + 1 <= block.finish);

        kill_ir_function_u32_u32(function, inst_idx + 1, block.finish);

        // If killing that range killed the current block we have to undo replacement instruction uses and exit
        if block.kind == IrBlockKind::Dead {
            for i in 0..rn {
                let op: IrOp = replacement.ops.as_slice()[i as usize];
                remove_use(function, op);
            }
            return;
        }

        block.finish = inst_idx;
    }

    // Before we remove old argument uses, we have to place our new instruction
    let copy: IrInst = function.instructions[inst_idx as usize].clone();

    // Inherit existing use count (last use is skipped as it will be defined later)
    replacement.use_count = function.instructions[inst_idx as usize].use_count;

    function.instructions[inst_idx as usize] = replacement;

    let cn = copy.ops.size();
    for i in 0..cn {
        let op: IrOp = copy.ops.as_slice()[i as usize];
        remove_use(function, op);
    }
}