From 4b23b6102c182e4f5a8612e16752d34465bf190c Mon Sep 17 00:00:00 2001
From: Martin Braun <martin.braun@ettus.com>
Date: Thu, 6 Jun 2019 18:47:05 -0700
Subject: rfnoc: noc_block_base: Store property tree reference from make_args

---
 host/include/uhd/rfnoc/noc_block_base.hpp | 13 +++++++++++++
 host/lib/rfnoc/noc_block_base.cpp         |  5 ++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/host/include/uhd/rfnoc/noc_block_base.hpp b/host/include/uhd/rfnoc/noc_block_base.hpp
index fb26f6089..e951ffc72 100644
--- a/host/include/uhd/rfnoc/noc_block_base.hpp
+++ b/host/include/uhd/rfnoc/noc_block_base.hpp
@@ -8,6 +8,7 @@
 #define INCLUDED_LIBUHD_NOC_BLOCK_BASE_HPP
 
 #include <uhd/config.hpp>
+#include <uhd/property_tree.hpp>
 #include <uhd/rfnoc/block_id.hpp>
 #include <uhd/rfnoc/node.hpp>
 #include <uhd/rfnoc/register_iface_holder.hpp>
@@ -105,6 +106,12 @@ public:
      */
     uhd::device_addr_t get_block_args() const { return _block_args; }
 
+    //! Return a reference to this block's subtree
+    uhd::property_tree::sptr& get_tree() const { return _tree; }
+
+    //! Return a reference to this block's subtree (non-const version)
+    uhd::property_tree::sptr& get_tree() { return _tree; }
+
 protected:
     noc_block_base(make_args_ptr make_args);
 
@@ -192,6 +199,12 @@ private:
     //! Arguments that were passed into this block
     const uhd::device_addr_t _block_args;
 
+    //! Reference to this block's subtree
+    //
+    // It is mutable because _tree->access<>(..).get() is not const, but we
+    // need to do just that in some const contexts
+    mutable uhd::property_tree::sptr _tree;
+
 }; // class noc_block_base
 
 }} /* namespace uhd::rfnoc */
diff --git a/host/lib/rfnoc/noc_block_base.cpp b/host/lib/rfnoc/noc_block_base.cpp
index f99d5aae7..6e72decfe 100644
--- a/host/lib/rfnoc/noc_block_base.cpp
+++ b/host/lib/rfnoc/noc_block_base.cpp
@@ -26,6 +26,7 @@ noc_block_base::noc_block_base(make_args_ptr make_args)
     , _clock_iface(make_args->clk_iface)
     , _mb_controller(std::move(make_args->mb_control))
     , _block_args(make_args->args)
+    , _tree(make_args->tree)
 {
     // First, create one tick_rate property for every port
     _tick_rate_props.reserve(get_num_input_ports() + get_num_output_ports());
@@ -62,7 +63,9 @@ noc_block_base::noc_block_base(make_args_ptr make_args)
 
 noc_block_base::~noc_block_base()
 {
-    // nop
+    for (const auto& node : _tree->list("")) {
+        _tree->remove(node);
+    }
 }
 
 void noc_block_base::set_num_input_ports(const size_t num_ports)
-- 
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