[cpp parser] normalize callable declaration identity and add regression tests

Author: melodyoncode

cpp/libclang/integration_test/function_cases/extern_c_identity/BUILD

@@ -0,0 +1,26 @@
+# *******************************************************************************
+# Copyright (c) 2026 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+load("//cpp/libclang/integration_test:test_rules.bzl", "cpp_parser_integration_test")
+
+cc_library(
+    name = "extern_c_identity",
+    srcs = ["functions.cpp"],
+    hdrs = ["functions.hpp"],
+    visibility = ["//cpp/libclang:__subpackages__"],
+)
+
+cpp_parser_integration_test(
+    name = "test_extern_c_identity",
+    expected_output = ["expected.json"],
+    target = ":extern_c_identity",
+)

cpp/libclang/integration_test/function_cases/extern_c_identity/expected.json

@@ -0,0 +1,63 @@
+{
+  "free_function_declarations": [
+    {
+      "name": "c_api",
+      "enclosing_namespace_id": null,
+      "return_type": "int",
+      "parameters": [
+        {
+          "name": "",
+          "param_type": "int",
+          "is_variadic": false
+        }
+      ],
+      "template_parameters": null,
+      "source_location": {
+        "file": "cpp/libclang/integration_test/function_cases/extern_c_identity/functions.hpp",
+        "line": 16
+      }
+    },
+    {
+      "name": "c_api_block",
+      "enclosing_namespace_id": null,
+      "return_type": "int",
+      "parameters": [
+        {
+          "name": "",
+          "param_type": "double",
+          "is_variadic": false
+        }
+      ],
+      "template_parameters": null,
+      "source_location": {
+        "file": "cpp/libclang/integration_test/function_cases/extern_c_identity/functions.hpp",
+        "line": 19
+      }
+    }
+  ],
+  "functions": [
+    {
+      "id": {
+        "name": "c_api",
+        "scope": "Global"
+      },
+      "kind": "Free",
+      "return_type": {
+        "Builtin": "int"
+      },
+      "body": []
+    },
+    {
+      "id": {
+        "name": "c_api_block",
+        "scope": "Global"
+      },
+      "kind": "Free",
+      "return_type": {
+        "Builtin": "int"
+      },
+      "body": []
+    }
+  ],
+  "types": {}
+}

cpp/libclang/integration_test/function_cases/extern_c_identity/functions.cpp

@@ -0,0 +1,24 @@
+/********************************************************************************
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+
+#include "functions.hpp"
+
+extern "C" {
+int c_api(int value) {
+    return value;
+}
+
+int c_api_block(double value) {
+    return static_cast<int>(value);
+}
+}

cpp/libclang/integration_test/function_cases/extern_c_identity/functions.hpp

@@ -0,0 +1,22 @@
+/********************************************************************************
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+
+#pragma once
+
+extern "C" int c_api(int);
+
+extern "C" {
+int c_api_block(double);
+}
+
+

cpp/libclang/integration_test/function_cases/extern_c_identity/run_test.rs

@@ -0,0 +1,19 @@
+// *******************************************************************************
+// Copyright (c) 2026 Contributors to the Eclipse Foundation
+//
+// See the NOTICE file(s) distributed with this work for additional
+// information regarding copyright ownership.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Apache License Version 2.0 which is available at
+// <https://www.apache.org/licenses/LICENSE-2.0>
+//
+// SPDX-License-Identifier: Apache-2.0
+// *******************************************************************************
+
+use test_framework::run_parser_case;
+
+#[test]
+fn test_extern_c_identity() {
+    run_parser_case();
+}

cpp/libclang/integration_test/function_cases/header_internal_linkage_declaration_identity/BUILD

@@ -0,0 +1,30 @@
+# *******************************************************************************
+# Copyright (c) 2026 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+
+load("//cpp/libclang/integration_test:test_rules.bzl", "cpp_parser_integration_test")
+
+cc_library(
+    name = "header_internal_linkage_declaration_identity",
+    srcs = [
+        "first.cpp",
+        "second.cpp",
+    ],
+    hdrs = ["internal_linkage.h"],
+    visibility = ["//cpp/libclang:__subpackages__"],
+)
+
+cpp_parser_integration_test(
+    name = "test_header_internal_linkage_declaration_identity",
+    expected_output = ["expected.json"],
+    target = ":header_internal_linkage_declaration_identity",
+)

cpp/libclang/integration_test/function_cases/header_internal_linkage_declaration_identity/expected.json

@@ -0,0 +1,28 @@
+{
+  "free_function_declarations": [
+    {
+      "name": "hidden",
+      "enclosing_namespace_id": null,
+      "return_type": "void",
+      "parameters": [],
+      "template_parameters": null,
+      "source_location": {
+        "file": "cpp/libclang/integration_test/function_cases/header_internal_linkage_declaration_identity/internal_linkage.h",
+        "line": 17
+      }
+    },
+    {
+      "name": "local_static",
+      "enclosing_namespace_id": null,
+      "return_type": "void",
+      "parameters": [],
+      "template_parameters": null,
+      "source_location": {
+        "file": "cpp/libclang/integration_test/function_cases/header_internal_linkage_declaration_identity/internal_linkage.h",
+        "line": 20
+      }
+    }
+  ],
+  "functions": [],
+  "types": {}
+}

cpp/libclang/integration_test/function_cases/header_internal_linkage_declaration_identity/first.cpp

@@ -0,0 +1,14 @@
+/********************************************************************************
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+
+#include "cpp/libclang/integration_test/function_cases/header_internal_linkage_declaration_identity/internal_linkage.h"

cpp/libclang/integration_test/function_cases/header_internal_linkage_declaration_identity/internal_linkage.h

@@ -0,0 +1,20 @@
+/********************************************************************************
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+
+// Forbidden based on MISRA C++:2023 Rule 10.3.1.
+
+namespace {
+void hidden();
+}
+
+static void local_static();

cpp/libclang/integration_test/function_cases/header_internal_linkage_declaration_identity/run_test.rs

@@ -0,0 +1,19 @@
+// *******************************************************************************
+// Copyright (c) 2026 Contributors to the Eclipse Foundation
+//
+// See the NOTICE file(s) distributed with this work for additional
+// information regarding copyright ownership.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Apache License Version 2.0 which is available at
+// <https://www.apache.org/licenses/LICENSE-2.0>
+//
+// SPDX-License-Identifier: Apache-2.0
+// *******************************************************************************
+
+use test_framework::run_parser_case;
+
+#[test]
+fn test_header_internal_linkage_declaration_identity() {
+    run_parser_case();
+}