arrayAccess

fn arrayAccess(
    gz: *GenZir,
    scope: *Scope,
    ri: ResultInfo,
    node: Ast.Node.Index,
) InnerError!Zir.Inst.Ref {
    const tree = gz.astgen.tree;
    switch (ri.rl) {
        .ref, .ref_coerced_ty => {
            const lhs_node, const rhs_node = tree.nodeData(node).node_and_node;
            const lhs = try expr(gz, scope, .{ .rl = .ref }, lhs_node);

            const cursor = maybeAdvanceSourceCursorToMainToken(gz, node);

            const rhs = try expr(gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, rhs_node);
            try emitDbgStmt(gz, cursor);

            return gz.addPlNode(.elem_ptr_node, node, Zir.Inst.Bin{ .lhs = lhs, .rhs = rhs });
        },
        .ref_const => {
            const lhs_node, const rhs_node = tree.nodeData(node).node_and_node;
            const lhs = try expr(gz, scope, .{ .rl = .ref_const }, lhs_node);

            const cursor = maybeAdvanceSourceCursorToMainToken(gz, node);

            const rhs = try expr(gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, rhs_node);
            try emitDbgStmt(gz, cursor);

            return gz.addPlNode(.elem_ptr_node, node, Zir.Inst.Bin{ .lhs = lhs, .rhs = rhs });
        },
        else => {
            const lhs_node, const rhs_node = tree.nodeData(node).node_and_node;
            const lhs = try expr(gz, scope, .{ .rl = .ref_const }, lhs_node);

            const cursor = maybeAdvanceSourceCursorToMainToken(gz, node);

            const rhs = try expr(gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, rhs_node);
            try emitDbgStmt(gz, cursor);

            return rvalue(gz, ri, try gz.addPlNode(.elem_ptr_load, node, Zir.Inst.Bin{ .lhs = lhs, .rhs = rhs }), node);
        },
    }
}