[Frontend-CPP] Add handling of default constructor call

Signed-off-by: Arthur Chan <arthur.chan@adalogics.com>

src/fuzz_introspector/frontends/frontend_cpp.py

@@ -372,14 +372,21 @@ def _process_callsites(stmt: Node) -> list[tuple[str, int, int]]:
                 ctr_type = stmt.child_by_field_name('type')
                 if ctr_type:
                     cls = ctr_type.text.decode()
-                    cls = f'{cls}::{cls}'
+                    cls = f'{cls}::{cls.rsplit("::")[-1]}'
                     callsites.append(
                         (cls, stmt.byte_range[1], stmt.start_point.row + 1))
 
             elif stmt.type == 'declaration':
                 var_type = stmt.child_by_field_name('type').text.decode()
                 var_name = stmt.child_by_field_name('declarator')
 
+                # Handles implicit default constructor call
+                if var_name.type == 'identifier':
+                    cls = f'{var_type}::{var_type.rsplit("::")[-1]}'
+                    if cls in functions:
+                        callsites.append(
+                            (cls, stmt.byte_range[1], stmt.start_point.row + 1))
+
                 while var_name.type not in [
                         'identifier', 'qualified_identifier',
                         'pointer_declarator', 'array_declarator',

src/test/test_frontends_cpp.py

@@ -28,7 +28,7 @@ def test_tree_sitter_cpp_sample1():
     assert len(project.get_source_codes_with_harnesses()) == 1
 
     # Callsite check
-    assert len(callsites[0].split('\n')) == 6
+    assert len(callsites[0].split('\n')) == 7
     assert ('    isPositive '
             'src/test/data/source-code/cpp/test-project-1/sample.cpp'
             in callsites[0])
@@ -77,27 +77,9 @@ def test_tree_sitter_cpp_sample3():
 
 
 def test_tree_sitter_cpp_sample4():
-    callsites, project = oss_fuzz.analyse_folder(
-        'c++',
-        'src/test/data/source-code/cpp/test-project-4',
-        'LLVMFuzzerTestOneInput',
-        dump_output=False,
-    )
-
-    # Project check
-    assert len(project.get_source_codes_with_harnesses()) == 1
-
-    # Callsite check
-    assert len(callsites[0].split('\n')) == 7
-    assert ('    Level1::Level2::Level3::Level4::DeepClass::deepMethod2 '
-            'src/test/data/source-code/cpp/test-project-4/deep_nested.cc'
-            in callsites[0])
-
-
-def test_tree_sitter_cpp_sample5():
     _, project = oss_fuzz.analyse_folder(
         'c++',
-        'src/test/data/source-code/cpp/test-project-5',
+        'src/test/data/source-code/cpp/test-project-4',
         'LLVMFuzzerTestOneInput',
         dump_output=False,
     )
@@ -107,15 +89,15 @@ def test_tree_sitter_cpp_sample5():
         function='LLVMFuzzerTestOneInput',
         visited_functions=set())
 
-    assert 'ClassOne::processInput' in functions_reached
-    assert 'NamespaceOne::processInput' in functions_reached
+    assert 'Level1::Level2::Level3::Level4::DeepClass::deepMethod2' in functions_reached
+    assert 'printf' in functions_reached
+    assert 'atoi' in functions_reached
 
 
-def test_frontend_reachability1():
-    """Test reachability of a nested namespace."""
+def test_tree_sitter_cpp_sample5():
     _, project = oss_fuzz.analyse_folder(
         'c++',
-        'src/test/data/source-code/cpp/test-project-4',
+        'src/test/data/source-code/cpp/test-project-5',
         'LLVMFuzzerTestOneInput',
         dump_output=False,
     )
@@ -125,8 +107,5 @@ def test_frontend_reachability1():
         function='LLVMFuzzerTestOneInput',
         visited_functions=set())
 
-    assert 'Level1::Level2::Level3::Level4::DeepClass::deepMethod2' in functions_reached
-    assert 'printf' in functions_reached
-
-    # TODO: revert the below assert. It should be true.
-    assert 'atoi' not in functions_reached
+    assert 'ClassOne::processInput' in functions_reached
+    assert 'NamespaceOne::processInput' in functions_reached