diff --git a/comm/functions.py b/comm/functions.py
index 2371be9..9bf3de5 100644
--- a/comm/functions.py
+++ b/comm/functions.py
@@ -368,3 +368,108 @@ def module_name_with(names, prefix=None):
     elif isinstance(names, list):
         return [mname + "." + n for n in names]
     raise ValueError("Invalid names type")
+
+
+def get_all_rtl_files(top_module, cfg):
+    """
+    Returns the file paths of all modules that the `top_module` depends on,
+    with the path of `top_module` as the first element in the list.
+
+    This function assumes that there is **only one module** in the file and
+    that the **file name matches the module name**.
+    """
+    import re
+    from glob import iglob
+    from collections import OrderedDict
+
+    some_verilog_keywords = {
+        'for', 'real', 'initial', 'input', 'endcase', 'typedef', 'primitive', 'always_comb', 'always_latch', 'negedge',
+        'repeat', 'while', 'endfunction', 'int', 'output', 'wire', 'logic', 'reg', 'assign', 'function', 'case',
+        'always_ff', 'if', 'posedge', 'table', 'end', 'task', 'forever', 'enum', 'endtask', 'module', 'localparam',
+        'timescale', 'endprimitive', 'else', 'endtable', 'always', 'parameter', 'time', 'endmodule', 'begin',
+        "and", "or", "not", "xor"
+    }
+
+    module_pattern = re.compile(r"\bmodule\s+(\w+)\b")
+    instance_pattern = re.compile(r"\b(\w+)\s+(?!module)(\w+)\s*\(")
+    module_path_map = OrderedDict()
+
+    def resolve_verilog_file(path):
+        module_set = set()
+        instance_set = set()
+
+        def remove_inline_comments(s):
+            # Remove the line comment first
+            s = re.sub(r"//.*$", "", s)
+            # Then remove the block comment
+            return re.sub(r'/\*.*?\*/', "", s)
+
+        def parse_line(line_text: str) -> None:
+            _line = remove_inline_comments(line_text)
+
+            # Extract names of declared modules
+            module_matches = module_pattern.finditer(_line)
+            for match in module_matches:
+                _name = match.group(1)
+                module_set.add(_name)
+
+            # Extract names of instanced modules
+            instance_matches = instance_pattern.finditer(_line)
+            for match in instance_matches:
+                _name = match.group(1)
+                if _name not in some_verilog_keywords:
+                    instance_set.add(_name)
+
+        # Code begin
+        block_comment_depth = 0
+        pending_line = ''
+
+        with open(path, "r") as file:
+            while True:
+                chunk = file.read(32768)
+                if not chunk:
+                    break
+
+                lines = ("".join((pending_line, chunk))).split("\n")
+                if lines:
+                    pending_line = lines.pop()
+
+                for line in lines:
+                    # for block comment
+                    start_pos = line.find("/*")
+                    end_pos = line.find("*/")
+                    while start_pos != -1 or end_pos != -1:
+                        # if '/*' appears before '*/', increase depth
+                        if start_pos != -1 and (end_pos == -1 or start_pos < end_pos):
+                            block_comment_depth += 1
+                            line = " ".join((line[:start_pos], line[start_pos + 2:]))
+                        # if '*/' appears before '/*', decrease depth
+                        elif end_pos != -1:
+                            block_comment_depth -= 1
+                            line = " ".join((line[:end_pos], line[end_pos + 2:]))
+                        start_pos = line.find("/*")
+                        end_pos = line.find("*/")
+
+                    # skip if content of current line is in block comment
+                    if block_comment_depth > 0:
+                        continue
+                    parse_line(line)
+        if pending_line:
+            parse_line(pending_line)
+        return module_set, instance_set
+
+    def get_rtl_helper(top_module_name) -> None:
+        from comm import get_rtl_dir
+        # Walk through the rtl dir
+        rtl_dir = os.path.join(str(get_rtl_dir(cfg=cfg)), f"**/{top_module_name}.*v")
+        for path in iglob(rtl_dir, recursive=True):
+            module_set, inst_set = resolve_verilog_file(path)
+            for _name in module_set:
+                module_path_map[_name] = path
+            module_set.clear()
+            for _name in inst_set:
+                if _name not in module_path_map:
+                    get_rtl_helper(_name)
+
+    get_rtl_helper(top_module)
+    return list(module_path_map.values())