ROCpd support [Part 1] (#279)

- Add rocpd support for
 - cpu_frequency
 - amd_smi
 - sampling

source/lib/core/rocpd/json.cpp

@@ -0,0 +1,99 @@
+// MIT License
+//
+// Copyright (c) 2025 Advanced Micro Devices, Inc. All Rights Reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include "json.hpp"
+#include <sstream>
+
+namespace rocpd
+{
+
+std::shared_ptr<json>
+json::create()
+{
+    return std::shared_ptr<json>(new json());
+}
+
+void
+json::set(const std::string& key, const json_value& value)
+{
+    data[key] = std::make_shared<json_value>(value);
+}
+
+std::string
+json::to_string() const
+{
+    std::ostringstream oss;
+    oss << "{";
+    bool first = true;
+
+    for(const auto& [key, value] : data)
+    {
+        if(!first) oss << ", ";
+        first = false;
+
+        oss << "\"" << key << "\": " << stringify(value);
+    }
+
+    oss << "}";
+    return oss.str();
+}
+
+std::string
+json::stringify(const std::shared_ptr<json_value>& value)
+{
+    std::ostringstream oss;
+    std::visit(
+        [&oss](auto&& arg) {
+            using T = std::decay_t<decltype(arg)>;
+            if constexpr(std::is_same_v<T, std::string>)
+                oss << "\"" << arg << "\"";
+            else if constexpr(std::is_same_v<T, bool>)
+                oss << (arg ? "true" : "false");
+            else if constexpr(std::is_same_v<T, std::nullptr_t>)
+                oss << "null";
+            else if constexpr(std::is_same_v<T, std::vector<json>>)
+            {
+                oss << "[";
+                bool first = true;
+                for(const auto& item : arg)
+                {
+                    if(!first) oss << ", ";
+                    first = false;
+                    oss << item.to_string();
+                }
+                oss << "]";
+            }
+            else if constexpr(std::is_same_v<T, std::shared_ptr<json>>)
+            {
+                oss << arg->to_string();
+            }
+            else
+            {
+                // handle int + double
+                oss << arg;
+            }
+        },
+        *value);
+    return oss.str();
+}
+
+}  // namespace rocpd