Core: Implement automatic symbol demangling

Source/Core/Common/CWDemangler.h

@@ -0,0 +1,67 @@
+// Copyright 2026 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Based on: https://github.com/encounter/cwdemangle
+// Copyright 2024 Luke Street <[email protected]>
+// SPDX-License-Identifier: CC0-1.0
+
+#pragma once
+
+#include <optional>
+#include <string>
+
+#include "Common/CommonTypes.h"
+
+namespace CWDemangler
+{
+
+// Options for [demangle].
+struct DemangleOptions
+{
+  // Replace `(void)` function parameters with `()`
+  bool omit_empty_parameters = true;
+  // Enable Metrowerks extension types (`__int128`, `__vec2x32float__`, etc.)
+  //
+  // Disabled by default since they conflict with template argument literals
+  // and can't always be demangled correctly.
+  bool mw_extensions = false;
+};
+
+struct DemangleTemplateArgsResult
+{
+  std::string_view name;
+  std::string args;
+};
+
+struct DemangleNameResult
+{
+  std::string class_name;
+  std::string full;
+  std::string_view rest;
+};
+
+struct DemangleArgResult
+{
+  std::string arg_pre;
+  std::string arg_post;
+  std::string_view rest;
+};
+
+struct DemangleFunctionArgsResult
+{
+  std::string args;
+  std::string_view rest;
+};
+
+std::optional<DemangleTemplateArgsResult> demangle_template_args(std::string_view str,
+                                                                 DemangleOptions options);
+std::optional<DemangleNameResult> demangle_name(std::string_view str, DemangleOptions options);
+std::optional<DemangleNameResult> demangle_qualified_name(std::string_view str,
+                                                          DemangleOptions options);
+std::optional<DemangleArgResult> demangle_arg(std::string_view str, DemangleOptions options);
+std::optional<DemangleFunctionArgsResult> demangle_function_args(std::string_view str,
+                                                                 DemangleOptions options);
+std::optional<std::string> demangle_special_function(std::string_view str,
+                                                     std::string_view class_name,
+                                                     DemangleOptions options);
+std::optional<std::string> demangle(std::string_view str, DemangleOptions options);
+}  // namespace CWDemangler